1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Checks; use Checks;
29 with Debug; use Debug;
30 with Elists; use Elists;
31 with Einfo; use Einfo;
32 with Errout; use Errout;
33 with Eval_Fat; use Eval_Fat;
34 with Exp_Ch3; use Exp_Ch3;
35 with Exp_Ch9; use Exp_Ch9;
36 with Exp_Disp; use Exp_Disp;
37 with Exp_Dist; use Exp_Dist;
38 with Exp_Tss; use Exp_Tss;
39 with Exp_Util; use Exp_Util;
40 with Fname; use Fname;
41 with Freeze; use Freeze;
42 with Itypes; use Itypes;
43 with Layout; use Layout;
45 with Lib.Xref; use Lib.Xref;
46 with Namet; use Namet;
47 with Nmake; use Nmake;
49 with Restrict; use Restrict;
50 with Rident; use Rident;
51 with Rtsfind; use Rtsfind;
53 with Sem_Aux; use Sem_Aux;
54 with Sem_Case; use Sem_Case;
55 with Sem_Cat; use Sem_Cat;
56 with Sem_Ch6; use Sem_Ch6;
57 with Sem_Ch7; use Sem_Ch7;
58 with Sem_Ch8; use Sem_Ch8;
59 with Sem_Ch13; use Sem_Ch13;
60 with Sem_Disp; use Sem_Disp;
61 with Sem_Dist; use Sem_Dist;
62 with Sem_Elim; use Sem_Elim;
63 with Sem_Eval; use Sem_Eval;
64 with Sem_Mech; use Sem_Mech;
65 with Sem_Prag; use Sem_Prag;
66 with Sem_Res; use Sem_Res;
67 with Sem_Smem; use Sem_Smem;
68 with Sem_Type; use Sem_Type;
69 with Sem_Util; use Sem_Util;
70 with Sem_Warn; use Sem_Warn;
71 with Stand; use Stand;
72 with Sinfo; use Sinfo;
73 with Sinput; use Sinput;
74 with Snames; use Snames;
75 with Targparm; use Targparm;
76 with Tbuild; use Tbuild;
77 with Ttypes; use Ttypes;
78 with Uintp; use Uintp;
79 with Urealp; use Urealp;
81 package body Sem_Ch3 is
83 -----------------------
84 -- Local Subprograms --
85 -----------------------
87 procedure Add_Interface_Tag_Components (N : Node_Id; Typ : Entity_Id);
88 -- Ada 2005 (AI-251): Add the tag components corresponding to all the
89 -- abstract interface types implemented by a record type or a derived
92 procedure Build_Derived_Type
94 Parent_Type : Entity_Id;
95 Derived_Type : Entity_Id;
96 Is_Completion : Boolean;
97 Derive_Subps : Boolean := True);
98 -- Create and decorate a Derived_Type given the Parent_Type entity. N is
99 -- the N_Full_Type_Declaration node containing the derived type definition.
100 -- Parent_Type is the entity for the parent type in the derived type
101 -- definition and Derived_Type the actual derived type. Is_Completion must
102 -- be set to False if Derived_Type is the N_Defining_Identifier node in N
103 -- (i.e. Derived_Type = Defining_Identifier (N)). In this case N is not the
104 -- completion of a private type declaration. If Is_Completion is set to
105 -- True, N is the completion of a private type declaration and Derived_Type
106 -- is different from the defining identifier inside N (i.e. Derived_Type /=
107 -- Defining_Identifier (N)). Derive_Subps indicates whether the parent
108 -- subprograms should be derived. The only case where this parameter is
109 -- False is when Build_Derived_Type is recursively called to process an
110 -- implicit derived full type for a type derived from a private type (in
111 -- that case the subprograms must only be derived for the private view of
114 -- ??? These flags need a bit of re-examination and re-documentation:
115 -- ??? are they both necessary (both seem related to the recursion)?
117 procedure Build_Derived_Access_Type
119 Parent_Type : Entity_Id;
120 Derived_Type : Entity_Id);
121 -- Subsidiary procedure to Build_Derived_Type. For a derived access type,
122 -- create an implicit base if the parent type is constrained or if the
123 -- subtype indication has a constraint.
125 procedure Build_Derived_Array_Type
127 Parent_Type : Entity_Id;
128 Derived_Type : Entity_Id);
129 -- Subsidiary procedure to Build_Derived_Type. For a derived array type,
130 -- create an implicit base if the parent type is constrained or if the
131 -- subtype indication has a constraint.
133 procedure Build_Derived_Concurrent_Type
135 Parent_Type : Entity_Id;
136 Derived_Type : Entity_Id);
137 -- Subsidiary procedure to Build_Derived_Type. For a derived task or
138 -- protected type, inherit entries and protected subprograms, check
139 -- legality of discriminant constraints if any.
141 procedure Build_Derived_Enumeration_Type
143 Parent_Type : Entity_Id;
144 Derived_Type : Entity_Id);
145 -- Subsidiary procedure to Build_Derived_Type. For a derived enumeration
146 -- type, we must create a new list of literals. Types derived from
147 -- Character and [Wide_]Wide_Character are special-cased.
149 procedure Build_Derived_Numeric_Type
151 Parent_Type : Entity_Id;
152 Derived_Type : Entity_Id);
153 -- Subsidiary procedure to Build_Derived_Type. For numeric types, create
154 -- an anonymous base type, and propagate constraint to subtype if needed.
156 procedure Build_Derived_Private_Type
158 Parent_Type : Entity_Id;
159 Derived_Type : Entity_Id;
160 Is_Completion : Boolean;
161 Derive_Subps : Boolean := True);
162 -- Subsidiary procedure to Build_Derived_Type. This procedure is complex
163 -- because the parent may or may not have a completion, and the derivation
164 -- may itself be a completion.
166 procedure Build_Derived_Record_Type
168 Parent_Type : Entity_Id;
169 Derived_Type : Entity_Id;
170 Derive_Subps : Boolean := True);
171 -- Subsidiary procedure for Build_Derived_Type and
172 -- Analyze_Private_Extension_Declaration used for tagged and untagged
173 -- record types. All parameters are as in Build_Derived_Type except that
174 -- N, in addition to being an N_Full_Type_Declaration node, can also be an
175 -- N_Private_Extension_Declaration node. See the definition of this routine
176 -- for much more info. Derive_Subps indicates whether subprograms should
177 -- be derived from the parent type. The only case where Derive_Subps is
178 -- False is for an implicit derived full type for a type derived from a
179 -- private type (see Build_Derived_Type).
181 procedure Build_Discriminal (Discrim : Entity_Id);
182 -- Create the discriminal corresponding to discriminant Discrim, that is
183 -- the parameter corresponding to Discrim to be used in initialization
184 -- procedures for the type where Discrim is a discriminant. Discriminals
185 -- are not used during semantic analysis, and are not fully defined
186 -- entities until expansion. Thus they are not given a scope until
187 -- initialization procedures are built.
189 function Build_Discriminant_Constraints
192 Derived_Def : Boolean := False) return Elist_Id;
193 -- Validate discriminant constraints and return the list of the constraints
194 -- in order of discriminant declarations, where T is the discriminated
195 -- unconstrained type. Def is the N_Subtype_Indication node where the
196 -- discriminants constraints for T are specified. Derived_Def is True
197 -- when building the discriminant constraints in a derived type definition
198 -- of the form "type D (...) is new T (xxx)". In this case T is the parent
199 -- type and Def is the constraint "(xxx)" on T and this routine sets the
200 -- Corresponding_Discriminant field of the discriminants in the derived
201 -- type D to point to the corresponding discriminants in the parent type T.
203 procedure Build_Discriminated_Subtype
207 Related_Nod : Node_Id;
208 For_Access : Boolean := False);
209 -- Subsidiary procedure to Constrain_Discriminated_Type and to
210 -- Process_Incomplete_Dependents. Given
212 -- T (a possibly discriminated base type)
213 -- Def_Id (a very partially built subtype for T),
215 -- the call completes Def_Id to be the appropriate E_*_Subtype.
217 -- The Elist is the list of discriminant constraints if any (it is set
218 -- to No_Elist if T is not a discriminated type, and to an empty list if
219 -- T has discriminants but there are no discriminant constraints). The
220 -- Related_Nod is the same as Decl_Node in Create_Constrained_Components.
221 -- The For_Access says whether or not this subtype is really constraining
222 -- an access type. That is its sole purpose is the designated type of an
223 -- access type -- in which case a Private_Subtype Is_For_Access_Subtype
224 -- is built to avoid freezing T when the access subtype is frozen.
226 function Build_Scalar_Bound
229 Der_T : Entity_Id) return Node_Id;
230 -- The bounds of a derived scalar type are conversions of the bounds of
231 -- the parent type. Optimize the representation if the bounds are literals.
232 -- Needs a more complete spec--what are the parameters exactly, and what
233 -- exactly is the returned value, and how is Bound affected???
235 procedure Build_Underlying_Full_View
239 -- If the completion of a private type is itself derived from a private
240 -- type, or if the full view of a private subtype is itself private, the
241 -- back-end has no way to compute the actual size of this type. We build
242 -- an internal subtype declaration of the proper parent type to convey
243 -- this information. This extra mechanism is needed because a full
244 -- view cannot itself have a full view (it would get clobbered during
247 procedure Check_Access_Discriminant_Requires_Limited
250 -- Check the restriction that the type to which an access discriminant
251 -- belongs must be a concurrent type or a descendant of a type with
252 -- the reserved word 'limited' in its declaration.
254 procedure Check_Anonymous_Access_Components
258 Comp_List : Node_Id);
259 -- Ada 2005 AI-382: an access component in a record definition can refer to
260 -- the enclosing record, in which case it denotes the type itself, and not
261 -- the current instance of the type. We create an anonymous access type for
262 -- the component, and flag it as an access to a component, so accessibility
263 -- checks are properly performed on it. The declaration of the access type
264 -- is placed ahead of that of the record to prevent order-of-elaboration
265 -- circularity issues in Gigi. We create an incomplete type for the record
266 -- declaration, which is the designated type of the anonymous access.
268 procedure Check_Delta_Expression (E : Node_Id);
269 -- Check that the expression represented by E is suitable for use as a
270 -- delta expression, i.e. it is of real type and is static.
272 procedure Check_Digits_Expression (E : Node_Id);
273 -- Check that the expression represented by E is suitable for use as a
274 -- digits expression, i.e. it is of integer type, positive and static.
276 procedure Check_Initialization (T : Entity_Id; Exp : Node_Id);
277 -- Validate the initialization of an object declaration. T is the required
278 -- type, and Exp is the initialization expression.
280 procedure Check_Interfaces (N : Node_Id; Def : Node_Id);
281 -- Check ARM rules 3.9.4 (15/2), 9.1 (9.d/2) and 9.4 (11.d/2)
283 procedure Check_Or_Process_Discriminants
286 Prev : Entity_Id := Empty);
287 -- If N is the full declaration of the completion T of an incomplete or
288 -- private type, check its discriminants (which are already known to be
289 -- conformant with those of the partial view, see Find_Type_Name),
290 -- otherwise process them. Prev is the entity of the partial declaration,
293 procedure Check_Real_Bound (Bound : Node_Id);
294 -- Check given bound for being of real type and static. If not, post an
295 -- appropriate message, and rewrite the bound with the real literal zero.
297 procedure Constant_Redeclaration
301 -- Various checks on legality of full declaration of deferred constant.
302 -- Id is the entity for the redeclaration, N is the N_Object_Declaration,
303 -- node. The caller has not yet set any attributes of this entity.
305 function Contain_Interface
307 Ifaces : Elist_Id) return Boolean;
308 -- Ada 2005: Determine whether Iface is present in the list Ifaces
310 procedure Convert_Scalar_Bounds
312 Parent_Type : Entity_Id;
313 Derived_Type : Entity_Id;
315 -- For derived scalar types, convert the bounds in the type definition to
316 -- the derived type, and complete their analysis. Given a constraint of the
317 -- form ".. new T range Lo .. Hi", Lo and Hi are analyzed and resolved with
318 -- T'Base, the parent_type. The bounds of the derived type (the anonymous
319 -- base) are copies of Lo and Hi. Finally, the bounds of the derived
320 -- subtype are conversions of those bounds to the derived_type, so that
321 -- their typing is consistent.
323 procedure Copy_Array_Base_Type_Attributes (T1, T2 : Entity_Id);
324 -- Copies attributes from array base type T2 to array base type T1. Copies
325 -- only attributes that apply to base types, but not subtypes.
327 procedure Copy_Array_Subtype_Attributes (T1, T2 : Entity_Id);
328 -- Copies attributes from array subtype T2 to array subtype T1. Copies
329 -- attributes that apply to both subtypes and base types.
331 procedure Create_Constrained_Components
335 Constraints : Elist_Id);
336 -- Build the list of entities for a constrained discriminated record
337 -- subtype. If a component depends on a discriminant, replace its subtype
338 -- using the discriminant values in the discriminant constraint. Subt
339 -- is the defining identifier for the subtype whose list of constrained
340 -- entities we will create. Decl_Node is the type declaration node where
341 -- we will attach all the itypes created. Typ is the base discriminated
342 -- type for the subtype Subt. Constraints is the list of discriminant
343 -- constraints for Typ.
345 function Constrain_Component_Type
347 Constrained_Typ : Entity_Id;
348 Related_Node : Node_Id;
350 Constraints : Elist_Id) return Entity_Id;
351 -- Given a discriminated base type Typ, a list of discriminant constraint
352 -- Constraints for Typ and a component of Typ, with type Compon_Type,
353 -- create and return the type corresponding to Compon_type where all
354 -- discriminant references are replaced with the corresponding constraint.
355 -- If no discriminant references occur in Compon_Typ then return it as is.
356 -- Constrained_Typ is the final constrained subtype to which the
357 -- constrained Compon_Type belongs. Related_Node is the node where we will
358 -- attach all the itypes created.
360 -- Above description is confused, what is Compon_Type???
362 procedure Constrain_Access
363 (Def_Id : in out Entity_Id;
365 Related_Nod : Node_Id);
366 -- Apply a list of constraints to an access type. If Def_Id is empty, it is
367 -- an anonymous type created for a subtype indication. In that case it is
368 -- created in the procedure and attached to Related_Nod.
370 procedure Constrain_Array
371 (Def_Id : in out Entity_Id;
373 Related_Nod : Node_Id;
374 Related_Id : Entity_Id;
376 -- Apply a list of index constraints to an unconstrained array type. The
377 -- first parameter is the entity for the resulting subtype. A value of
378 -- Empty for Def_Id indicates that an implicit type must be created, but
379 -- creation is delayed (and must be done by this procedure) because other
380 -- subsidiary implicit types must be created first (which is why Def_Id
381 -- is an in/out parameter). The second parameter is a subtype indication
382 -- node for the constrained array to be created (e.g. something of the
383 -- form string (1 .. 10)). Related_Nod gives the place where this type
384 -- has to be inserted in the tree. The Related_Id and Suffix parameters
385 -- are used to build the associated Implicit type name.
387 procedure Constrain_Concurrent
388 (Def_Id : in out Entity_Id;
390 Related_Nod : Node_Id;
391 Related_Id : Entity_Id;
393 -- Apply list of discriminant constraints to an unconstrained concurrent
396 -- SI is the N_Subtype_Indication node containing the constraint and
397 -- the unconstrained type to constrain.
399 -- Def_Id is the entity for the resulting constrained subtype. A value
400 -- of Empty for Def_Id indicates that an implicit type must be created,
401 -- but creation is delayed (and must be done by this procedure) because
402 -- other subsidiary implicit types must be created first (which is why
403 -- Def_Id is an in/out parameter).
405 -- Related_Nod gives the place where this type has to be inserted
408 -- The last two arguments are used to create its external name if needed.
410 function Constrain_Corresponding_Record
411 (Prot_Subt : Entity_Id;
412 Corr_Rec : Entity_Id;
413 Related_Nod : Node_Id;
414 Related_Id : Entity_Id) return Entity_Id;
415 -- When constraining a protected type or task type with discriminants,
416 -- constrain the corresponding record with the same discriminant values.
418 procedure Constrain_Decimal (Def_Id : Node_Id; S : Node_Id);
419 -- Constrain a decimal fixed point type with a digits constraint and/or a
420 -- range constraint, and build E_Decimal_Fixed_Point_Subtype entity.
422 procedure Constrain_Discriminated_Type
425 Related_Nod : Node_Id;
426 For_Access : Boolean := False);
427 -- Process discriminant constraints of composite type. Verify that values
428 -- have been provided for all discriminants, that the original type is
429 -- unconstrained, and that the types of the supplied expressions match
430 -- the discriminant types. The first three parameters are like in routine
431 -- Constrain_Concurrent. See Build_Discriminated_Subtype for an explanation
434 procedure Constrain_Enumeration (Def_Id : Node_Id; S : Node_Id);
435 -- Constrain an enumeration type with a range constraint. This is identical
436 -- to Constrain_Integer, but for the Ekind of the resulting subtype.
438 procedure Constrain_Float (Def_Id : Node_Id; S : Node_Id);
439 -- Constrain a floating point type with either a digits constraint
440 -- and/or a range constraint, building a E_Floating_Point_Subtype.
442 procedure Constrain_Index
445 Related_Nod : Node_Id;
446 Related_Id : Entity_Id;
449 -- Process an index constraint S in a constrained array declaration. The
450 -- constraint can be a subtype name, or a range with or without an explicit
451 -- subtype mark. The index is the corresponding index of the unconstrained
452 -- array. The Related_Id and Suffix parameters are used to build the
453 -- associated Implicit type name.
455 procedure Constrain_Integer (Def_Id : Node_Id; S : Node_Id);
456 -- Build subtype of a signed or modular integer type
458 procedure Constrain_Ordinary_Fixed (Def_Id : Node_Id; S : Node_Id);
459 -- Constrain an ordinary fixed point type with a range constraint, and
460 -- build an E_Ordinary_Fixed_Point_Subtype entity.
462 procedure Copy_And_Swap (Priv, Full : Entity_Id);
463 -- Copy the Priv entity into the entity of its full declaration then swap
464 -- the two entities in such a manner that the former private type is now
465 -- seen as a full type.
467 procedure Decimal_Fixed_Point_Type_Declaration
470 -- Create a new decimal fixed point type, and apply the constraint to
471 -- obtain a subtype of this new type.
473 procedure Complete_Private_Subtype
476 Full_Base : Entity_Id;
477 Related_Nod : Node_Id);
478 -- Complete the implicit full view of a private subtype by setting the
479 -- appropriate semantic fields. If the full view of the parent is a record
480 -- type, build constrained components of subtype.
482 procedure Derive_Progenitor_Subprograms
483 (Parent_Type : Entity_Id;
484 Tagged_Type : Entity_Id);
485 -- Ada 2005 (AI-251): To complete type derivation, collect the primitive
486 -- operations of progenitors of Tagged_Type, and replace the subsidiary
487 -- subtypes with Tagged_Type, to build the specs of the inherited interface
488 -- primitives. The derived primitives are aliased to those of the
489 -- interface. This routine takes care also of transferring to the full view
490 -- subprograms associated with the partial view of Tagged_Type that cover
491 -- interface primitives.
493 procedure Derived_Standard_Character
495 Parent_Type : Entity_Id;
496 Derived_Type : Entity_Id);
497 -- Subsidiary procedure to Build_Derived_Enumeration_Type which handles
498 -- derivations from types Standard.Character and Standard.Wide_Character.
500 procedure Derived_Type_Declaration
503 Is_Completion : Boolean);
504 -- Process a derived type declaration. Build_Derived_Type is invoked
505 -- to process the actual derived type definition. Parameters N and
506 -- Is_Completion have the same meaning as in Build_Derived_Type.
507 -- T is the N_Defining_Identifier for the entity defined in the
508 -- N_Full_Type_Declaration node N, that is T is the derived type.
510 procedure Enumeration_Type_Declaration (T : Entity_Id; Def : Node_Id);
511 -- Insert each literal in symbol table, as an overloadable identifier. Each
512 -- enumeration type is mapped into a sequence of integers, and each literal
513 -- is defined as a constant with integer value. If any of the literals are
514 -- character literals, the type is a character type, which means that
515 -- strings are legal aggregates for arrays of components of the type.
517 function Expand_To_Stored_Constraint
519 Constraint : Elist_Id) return Elist_Id;
520 -- Given a constraint (i.e. a list of expressions) on the discriminants of
521 -- Typ, expand it into a constraint on the stored discriminants and return
522 -- the new list of expressions constraining the stored discriminants.
524 function Find_Type_Of_Object
526 Related_Nod : Node_Id) return Entity_Id;
527 -- Get type entity for object referenced by Obj_Def, attaching the
528 -- implicit types generated to Related_Nod
530 procedure Floating_Point_Type_Declaration (T : Entity_Id; Def : Node_Id);
531 -- Create a new float and apply the constraint to obtain subtype of it
533 function Has_Range_Constraint (N : Node_Id) return Boolean;
534 -- Given an N_Subtype_Indication node N, return True if a range constraint
535 -- is present, either directly, or as part of a digits or delta constraint.
536 -- In addition, a digits constraint in the decimal case returns True, since
537 -- it establishes a default range if no explicit range is present.
539 function Inherit_Components
541 Parent_Base : Entity_Id;
542 Derived_Base : Entity_Id;
544 Inherit_Discr : Boolean;
545 Discs : Elist_Id) return Elist_Id;
546 -- Called from Build_Derived_Record_Type to inherit the components of
547 -- Parent_Base (a base type) into the Derived_Base (the derived base type).
548 -- For more information on derived types and component inheritance please
549 -- consult the comment above the body of Build_Derived_Record_Type.
551 -- N is the original derived type declaration
553 -- Is_Tagged is set if we are dealing with tagged types
555 -- If Inherit_Discr is set, Derived_Base inherits its discriminants from
556 -- Parent_Base, otherwise no discriminants are inherited.
558 -- Discs gives the list of constraints that apply to Parent_Base in the
559 -- derived type declaration. If Discs is set to No_Elist, then we have
560 -- the following situation:
562 -- type Parent (D1..Dn : ..) is [tagged] record ...;
563 -- type Derived is new Parent [with ...];
565 -- which gets treated as
567 -- type Derived (D1..Dn : ..) is new Parent (D1,..,Dn) [with ...];
569 -- For untagged types the returned value is an association list. The list
570 -- starts from the association (Parent_Base => Derived_Base), and then it
571 -- contains a sequence of the associations of the form
573 -- (Old_Component => New_Component),
575 -- where Old_Component is the Entity_Id of a component in Parent_Base and
576 -- New_Component is the Entity_Id of the corresponding component in
577 -- Derived_Base. For untagged records, this association list is needed when
578 -- copying the record declaration for the derived base. In the tagged case
579 -- the value returned is irrelevant.
581 function Is_Valid_Constraint_Kind
583 Constraint_Kind : Node_Kind) return Boolean;
584 -- Returns True if it is legal to apply the given kind of constraint to the
585 -- given kind of type (index constraint to an array type, for example).
587 procedure Modular_Type_Declaration (T : Entity_Id; Def : Node_Id);
588 -- Create new modular type. Verify that modulus is in bounds and is
589 -- a power of two (implementation restriction).
591 procedure New_Concatenation_Op (Typ : Entity_Id);
592 -- Create an abbreviated declaration for an operator in order to
593 -- materialize concatenation on array types.
595 procedure Ordinary_Fixed_Point_Type_Declaration
598 -- Create a new ordinary fixed point type, and apply the constraint to
599 -- obtain subtype of it.
601 procedure Prepare_Private_Subtype_Completion
603 Related_Nod : Node_Id);
604 -- Id is a subtype of some private type. Creates the full declaration
605 -- associated with Id whenever possible, i.e. when the full declaration
606 -- of the base type is already known. Records each subtype into
607 -- Private_Dependents of the base type.
609 procedure Process_Incomplete_Dependents
613 -- Process all entities that depend on an incomplete type. There include
614 -- subtypes, subprogram types that mention the incomplete type in their
615 -- profiles, and subprogram with access parameters that designate the
618 -- Inc_T is the defining identifier of an incomplete type declaration, its
619 -- Ekind is E_Incomplete_Type.
621 -- N is the corresponding N_Full_Type_Declaration for Inc_T.
623 -- Full_T is N's defining identifier.
625 -- Subtypes of incomplete types with discriminants are completed when the
626 -- parent type is. This is simpler than private subtypes, because they can
627 -- only appear in the same scope, and there is no need to exchange views.
628 -- Similarly, access_to_subprogram types may have a parameter or a return
629 -- type that is an incomplete type, and that must be replaced with the
632 -- If the full type is tagged, subprogram with access parameters that
633 -- designated the incomplete may be primitive operations of the full type,
634 -- and have to be processed accordingly.
636 procedure Process_Real_Range_Specification (Def : Node_Id);
637 -- Given the type definition for a real type, this procedure processes and
638 -- checks the real range specification of this type definition if one is
639 -- present. If errors are found, error messages are posted, and the
640 -- Real_Range_Specification of Def is reset to Empty.
642 procedure Record_Type_Declaration
646 -- Process a record type declaration (for both untagged and tagged
647 -- records). Parameters T and N are exactly like in procedure
648 -- Derived_Type_Declaration, except that no flag Is_Completion is needed
649 -- for this routine. If this is the completion of an incomplete type
650 -- declaration, Prev is the entity of the incomplete declaration, used for
651 -- cross-referencing. Otherwise Prev = T.
653 procedure Record_Type_Definition (Def : Node_Id; Prev_T : Entity_Id);
654 -- This routine is used to process the actual record type definition (both
655 -- for untagged and tagged records). Def is a record type definition node.
656 -- This procedure analyzes the components in this record type definition.
657 -- Prev_T is the entity for the enclosing record type. It is provided so
658 -- that its Has_Task flag can be set if any of the component have Has_Task
659 -- set. If the declaration is the completion of an incomplete type
660 -- declaration, Prev_T is the original incomplete type, whose full view is
663 procedure Replace_Components (Typ : Entity_Id; Decl : Node_Id);
664 -- Subsidiary to Build_Derived_Record_Type. For untagged records, we
665 -- build a copy of the declaration tree of the parent, and we create
666 -- independently the list of components for the derived type. Semantic
667 -- information uses the component entities, but record representation
668 -- clauses are validated on the declaration tree. This procedure replaces
669 -- discriminants and components in the declaration with those that have
670 -- been created by Inherit_Components.
672 procedure Set_Fixed_Range
677 -- Build a range node with the given bounds and set it as the Scalar_Range
678 -- of the given fixed-point type entity. Loc is the source location used
679 -- for the constructed range. See body for further details.
681 procedure Set_Scalar_Range_For_Subtype
685 -- This routine is used to set the scalar range field for a subtype given
686 -- Def_Id, the entity for the subtype, and R, the range expression for the
687 -- scalar range. Subt provides the parent subtype to be used to analyze,
688 -- resolve, and check the given range.
690 procedure Signed_Integer_Type_Declaration (T : Entity_Id; Def : Node_Id);
691 -- Create a new signed integer entity, and apply the constraint to obtain
692 -- the required first named subtype of this type.
694 procedure Set_Stored_Constraint_From_Discriminant_Constraint
696 -- E is some record type. This routine computes E's Stored_Constraint
697 -- from its Discriminant_Constraint.
699 procedure Diagnose_Interface (N : Node_Id; E : Entity_Id);
700 -- Check that an entity in a list of progenitors is an interface,
701 -- emit error otherwise.
703 -----------------------
704 -- Access_Definition --
705 -----------------------
707 function Access_Definition
708 (Related_Nod : Node_Id;
709 N : Node_Id) return Entity_Id
711 Loc : constant Source_Ptr := Sloc (Related_Nod);
712 Anon_Type : Entity_Id;
713 Anon_Scope : Entity_Id;
714 Desig_Type : Entity_Id;
716 Enclosing_Prot_Type : Entity_Id := Empty;
719 if Is_Entry (Current_Scope)
720 and then Is_Task_Type (Etype (Scope (Current_Scope)))
722 Error_Msg_N ("task entries cannot have access parameters", N);
726 -- Ada 2005: for an object declaration the corresponding anonymous
727 -- type is declared in the current scope.
729 -- If the access definition is the return type of another access to
730 -- function, scope is the current one, because it is the one of the
731 -- current type declaration.
733 if Nkind_In (Related_Nod, N_Object_Declaration,
734 N_Access_Function_Definition)
736 Anon_Scope := Current_Scope;
738 -- For the anonymous function result case, retrieve the scope of the
739 -- function specification's associated entity rather than using the
740 -- current scope. The current scope will be the function itself if the
741 -- formal part is currently being analyzed, but will be the parent scope
742 -- in the case of a parameterless function, and we always want to use
743 -- the function's parent scope. Finally, if the function is a child
744 -- unit, we must traverse the tree to retrieve the proper entity.
746 elsif Nkind (Related_Nod) = N_Function_Specification
747 and then Nkind (Parent (N)) /= N_Parameter_Specification
749 -- If the current scope is a protected type, the anonymous access
750 -- is associated with one of the protected operations, and must
751 -- be available in the scope that encloses the protected declaration.
752 -- Otherwise the type is in the scope enclosing the subprogram.
754 -- If the function has formals, The return type of a subprogram
755 -- declaration is analyzed in the scope of the subprogram (see
756 -- Process_Formals) and thus the protected type, if present, is
757 -- the scope of the current function scope.
759 if Ekind (Current_Scope) = E_Protected_Type then
760 Enclosing_Prot_Type := Current_Scope;
762 elsif Ekind (Current_Scope) = E_Function
763 and then Ekind (Scope (Current_Scope)) = E_Protected_Type
765 Enclosing_Prot_Type := Scope (Current_Scope);
768 if Present (Enclosing_Prot_Type) then
769 Anon_Scope := Scope (Enclosing_Prot_Type);
772 Anon_Scope := Scope (Defining_Entity (Related_Nod));
776 -- For access formals, access components, and access discriminants,
777 -- the scope is that of the enclosing declaration,
779 Anon_Scope := Scope (Current_Scope);
784 (E_Anonymous_Access_Type, Related_Nod, Scope_Id => Anon_Scope);
787 and then Ada_Version >= Ada_2005
789 Error_Msg_N ("ALL is not permitted for anonymous access types", N);
792 -- Ada 2005 (AI-254): In case of anonymous access to subprograms call
793 -- the corresponding semantic routine
795 if Present (Access_To_Subprogram_Definition (N)) then
796 Access_Subprogram_Declaration
797 (T_Name => Anon_Type,
798 T_Def => Access_To_Subprogram_Definition (N));
800 if Ekind (Anon_Type) = E_Access_Protected_Subprogram_Type then
802 (Anon_Type, E_Anonymous_Access_Protected_Subprogram_Type);
805 (Anon_Type, E_Anonymous_Access_Subprogram_Type);
808 Set_Can_Use_Internal_Rep
809 (Anon_Type, not Always_Compatible_Rep_On_Target);
811 -- If the anonymous access is associated with a protected operation
812 -- create a reference to it after the enclosing protected definition
813 -- because the itype will be used in the subsequent bodies.
815 if Ekind (Current_Scope) = E_Protected_Type then
816 Build_Itype_Reference (Anon_Type, Parent (Current_Scope));
822 Find_Type (Subtype_Mark (N));
823 Desig_Type := Entity (Subtype_Mark (N));
825 Set_Directly_Designated_Type (Anon_Type, Desig_Type);
826 Set_Etype (Anon_Type, Anon_Type);
828 -- Make sure the anonymous access type has size and alignment fields
829 -- set, as required by gigi. This is necessary in the case of the
830 -- Task_Body_Procedure.
832 if not Has_Private_Component (Desig_Type) then
833 Layout_Type (Anon_Type);
836 -- Ada 2005 (AI-231): Ada 2005 semantics for anonymous access differs
837 -- from Ada 95 semantics. In Ada 2005, anonymous access must specify if
838 -- the null value is allowed. In Ada 95 the null value is never allowed.
840 if Ada_Version >= Ada_2005 then
841 Set_Can_Never_Be_Null (Anon_Type, Null_Exclusion_Present (N));
843 Set_Can_Never_Be_Null (Anon_Type, True);
846 -- The anonymous access type is as public as the discriminated type or
847 -- subprogram that defines it. It is imported (for back-end purposes)
848 -- if the designated type is.
850 Set_Is_Public (Anon_Type, Is_Public (Scope (Anon_Type)));
852 -- Ada 2005 (AI-231): Propagate the access-constant attribute
854 Set_Is_Access_Constant (Anon_Type, Constant_Present (N));
856 -- The context is either a subprogram declaration, object declaration,
857 -- or an access discriminant, in a private or a full type declaration.
858 -- In the case of a subprogram, if the designated type is incomplete,
859 -- the operation will be a primitive operation of the full type, to be
860 -- updated subsequently. If the type is imported through a limited_with
861 -- clause, the subprogram is not a primitive operation of the type
862 -- (which is declared elsewhere in some other scope).
864 if Ekind (Desig_Type) = E_Incomplete_Type
865 and then not From_With_Type (Desig_Type)
866 and then Is_Overloadable (Current_Scope)
868 Append_Elmt (Current_Scope, Private_Dependents (Desig_Type));
869 Set_Has_Delayed_Freeze (Current_Scope);
872 -- Ada 2005: if the designated type is an interface that may contain
873 -- tasks, create a Master entity for the declaration. This must be done
874 -- before expansion of the full declaration, because the declaration may
875 -- include an expression that is an allocator, whose expansion needs the
876 -- proper Master for the created tasks.
878 if Nkind (Related_Nod) = N_Object_Declaration
879 and then Expander_Active
881 if Is_Interface (Desig_Type)
882 and then Is_Limited_Record (Desig_Type)
884 Build_Class_Wide_Master (Anon_Type);
886 -- Similarly, if the type is an anonymous access that designates
887 -- tasks, create a master entity for it in the current context.
889 elsif Has_Task (Desig_Type)
890 and then Comes_From_Source (Related_Nod)
891 and then not Restriction_Active (No_Task_Hierarchy)
893 if not Has_Master_Entity (Current_Scope) then
895 Make_Object_Declaration (Loc,
896 Defining_Identifier =>
897 Make_Defining_Identifier (Loc, Name_uMaster),
898 Constant_Present => True,
900 New_Reference_To (RTE (RE_Master_Id), Loc),
902 Make_Explicit_Dereference (Loc,
903 New_Reference_To (RTE (RE_Current_Master), Loc)));
905 Insert_Before (Related_Nod, Decl);
908 Set_Master_Id (Anon_Type, Defining_Identifier (Decl));
909 Set_Has_Master_Entity (Current_Scope);
911 Build_Master_Renaming (Related_Nod, Anon_Type);
916 -- For a private component of a protected type, it is imperative that
917 -- the back-end elaborate the type immediately after the protected
918 -- declaration, because this type will be used in the declarations
919 -- created for the component within each protected body, so we must
920 -- create an itype reference for it now.
922 if Nkind (Parent (Related_Nod)) = N_Protected_Definition then
923 Build_Itype_Reference (Anon_Type, Parent (Parent (Related_Nod)));
925 -- Similarly, if the access definition is the return result of a
926 -- function, create an itype reference for it because it will be used
927 -- within the function body. For a regular function that is not a
928 -- compilation unit, insert reference after the declaration. For a
929 -- protected operation, insert it after the enclosing protected type
930 -- declaration. In either case, do not create a reference for a type
931 -- obtained through a limited_with clause, because this would introduce
932 -- semantic dependencies.
934 -- Similarly, do not create a reference if the designated type is a
935 -- generic formal, because no use of it will reach the backend.
937 elsif Nkind (Related_Nod) = N_Function_Specification
938 and then not From_With_Type (Desig_Type)
939 and then not Is_Generic_Type (Desig_Type)
941 if Present (Enclosing_Prot_Type) then
942 Build_Itype_Reference (Anon_Type, Parent (Enclosing_Prot_Type));
944 elsif Is_List_Member (Parent (Related_Nod))
945 and then Nkind (Parent (N)) /= N_Parameter_Specification
947 Build_Itype_Reference (Anon_Type, Parent (Related_Nod));
950 -- Finally, create an itype reference for an object declaration of an
951 -- anonymous access type. This is strictly necessary only for deferred
952 -- constants, but in any case will avoid out-of-scope problems in the
955 elsif Nkind (Related_Nod) = N_Object_Declaration then
956 Build_Itype_Reference (Anon_Type, Related_Nod);
960 end Access_Definition;
962 -----------------------------------
963 -- Access_Subprogram_Declaration --
964 -----------------------------------
966 procedure Access_Subprogram_Declaration
971 procedure Check_For_Premature_Usage (Def : Node_Id);
972 -- Check that type T_Name is not used, directly or recursively, as a
973 -- parameter or a return type in Def. Def is either a subtype, an
974 -- access_definition, or an access_to_subprogram_definition.
976 -------------------------------
977 -- Check_For_Premature_Usage --
978 -------------------------------
980 procedure Check_For_Premature_Usage (Def : Node_Id) is
984 -- Check for a subtype mark
986 if Nkind (Def) in N_Has_Etype then
987 if Etype (Def) = T_Name then
989 ("type& cannot be used before end of its declaration", Def);
992 -- If this is not a subtype, then this is an access_definition
994 elsif Nkind (Def) = N_Access_Definition then
995 if Present (Access_To_Subprogram_Definition (Def)) then
996 Check_For_Premature_Usage
997 (Access_To_Subprogram_Definition (Def));
999 Check_For_Premature_Usage (Subtype_Mark (Def));
1002 -- The only cases left are N_Access_Function_Definition and
1003 -- N_Access_Procedure_Definition.
1006 if Present (Parameter_Specifications (Def)) then
1007 Param := First (Parameter_Specifications (Def));
1008 while Present (Param) loop
1009 Check_For_Premature_Usage (Parameter_Type (Param));
1010 Param := Next (Param);
1014 if Nkind (Def) = N_Access_Function_Definition then
1015 Check_For_Premature_Usage (Result_Definition (Def));
1018 end Check_For_Premature_Usage;
1022 Formals : constant List_Id := Parameter_Specifications (T_Def);
1025 Desig_Type : constant Entity_Id :=
1026 Create_Itype (E_Subprogram_Type, Parent (T_Def));
1028 -- Start of processing for Access_Subprogram_Declaration
1031 -- Associate the Itype node with the inner full-type declaration or
1032 -- subprogram spec or entry body. This is required to handle nested
1033 -- anonymous declarations. For example:
1036 -- (X : access procedure
1037 -- (Y : access procedure
1040 D_Ityp := Associated_Node_For_Itype (Desig_Type);
1041 while not (Nkind_In (D_Ityp, N_Full_Type_Declaration,
1042 N_Private_Type_Declaration,
1043 N_Private_Extension_Declaration,
1044 N_Procedure_Specification,
1045 N_Function_Specification,
1049 Nkind_In (D_Ityp, N_Object_Declaration,
1050 N_Object_Renaming_Declaration,
1051 N_Formal_Object_Declaration,
1052 N_Formal_Type_Declaration,
1053 N_Task_Type_Declaration,
1054 N_Protected_Type_Declaration))
1056 D_Ityp := Parent (D_Ityp);
1057 pragma Assert (D_Ityp /= Empty);
1060 Set_Associated_Node_For_Itype (Desig_Type, D_Ityp);
1062 if Nkind_In (D_Ityp, N_Procedure_Specification,
1063 N_Function_Specification)
1065 Set_Scope (Desig_Type, Scope (Defining_Entity (D_Ityp)));
1067 elsif Nkind_In (D_Ityp, N_Full_Type_Declaration,
1068 N_Object_Declaration,
1069 N_Object_Renaming_Declaration,
1070 N_Formal_Type_Declaration)
1072 Set_Scope (Desig_Type, Scope (Defining_Identifier (D_Ityp)));
1075 if Nkind (T_Def) = N_Access_Function_Definition then
1076 if Nkind (Result_Definition (T_Def)) = N_Access_Definition then
1078 Acc : constant Node_Id := Result_Definition (T_Def);
1081 if Present (Access_To_Subprogram_Definition (Acc))
1083 Protected_Present (Access_To_Subprogram_Definition (Acc))
1087 Replace_Anonymous_Access_To_Protected_Subprogram
1093 Access_Definition (T_Def, Result_Definition (T_Def)));
1098 Analyze (Result_Definition (T_Def));
1101 Typ : constant Entity_Id := Entity (Result_Definition (T_Def));
1104 -- If a null exclusion is imposed on the result type, then
1105 -- create a null-excluding itype (an access subtype) and use
1106 -- it as the function's Etype.
1108 if Is_Access_Type (Typ)
1109 and then Null_Exclusion_In_Return_Present (T_Def)
1111 Set_Etype (Desig_Type,
1112 Create_Null_Excluding_Itype
1114 Related_Nod => T_Def,
1115 Scope_Id => Current_Scope));
1118 if From_With_Type (Typ) then
1120 -- AI05-151: Incomplete types are allowed in all basic
1121 -- declarations, including access to subprograms.
1123 if Ada_Version >= Ada_2012 then
1128 ("illegal use of incomplete type&",
1129 Result_Definition (T_Def), Typ);
1132 elsif Ekind (Current_Scope) = E_Package
1133 and then In_Private_Part (Current_Scope)
1135 if Ekind (Typ) = E_Incomplete_Type then
1136 Append_Elmt (Desig_Type, Private_Dependents (Typ));
1138 elsif Is_Class_Wide_Type (Typ)
1139 and then Ekind (Etype (Typ)) = E_Incomplete_Type
1142 (Desig_Type, Private_Dependents (Etype (Typ)));
1146 Set_Etype (Desig_Type, Typ);
1151 if not (Is_Type (Etype (Desig_Type))) then
1153 ("expect type in function specification",
1154 Result_Definition (T_Def));
1158 Set_Etype (Desig_Type, Standard_Void_Type);
1161 if Present (Formals) then
1162 Push_Scope (Desig_Type);
1164 -- A bit of a kludge here. These kludges will be removed when Itypes
1165 -- have proper parent pointers to their declarations???
1167 -- Kludge 1) Link defining_identifier of formals. Required by
1168 -- First_Formal to provide its functionality.
1174 F := First (Formals);
1175 while Present (F) loop
1176 if No (Parent (Defining_Identifier (F))) then
1177 Set_Parent (Defining_Identifier (F), F);
1184 Process_Formals (Formals, Parent (T_Def));
1186 -- Kludge 2) End_Scope requires that the parent pointer be set to
1187 -- something reasonable, but Itypes don't have parent pointers. So
1188 -- we set it and then unset it ???
1190 Set_Parent (Desig_Type, T_Name);
1192 Set_Parent (Desig_Type, Empty);
1195 -- Check for premature usage of the type being defined
1197 Check_For_Premature_Usage (T_Def);
1199 -- The return type and/or any parameter type may be incomplete. Mark
1200 -- the subprogram_type as depending on the incomplete type, so that
1201 -- it can be updated when the full type declaration is seen. This
1202 -- only applies to incomplete types declared in some enclosing scope,
1203 -- not to limited views from other packages.
1205 if Present (Formals) then
1206 Formal := First_Formal (Desig_Type);
1207 while Present (Formal) loop
1208 if Ekind (Formal) /= E_In_Parameter
1209 and then Nkind (T_Def) = N_Access_Function_Definition
1211 Error_Msg_N ("functions can only have IN parameters", Formal);
1214 if Ekind (Etype (Formal)) = E_Incomplete_Type
1215 and then In_Open_Scopes (Scope (Etype (Formal)))
1217 Append_Elmt (Desig_Type, Private_Dependents (Etype (Formal)));
1218 Set_Has_Delayed_Freeze (Desig_Type);
1221 Next_Formal (Formal);
1225 -- If the return type is incomplete, this is legal as long as the
1226 -- type is declared in the current scope and will be completed in
1227 -- it (rather than being part of limited view).
1229 if Ekind (Etype (Desig_Type)) = E_Incomplete_Type
1230 and then not Has_Delayed_Freeze (Desig_Type)
1231 and then In_Open_Scopes (Scope (Etype (Desig_Type)))
1233 Append_Elmt (Desig_Type, Private_Dependents (Etype (Desig_Type)));
1234 Set_Has_Delayed_Freeze (Desig_Type);
1237 Check_Delayed_Subprogram (Desig_Type);
1239 if Protected_Present (T_Def) then
1240 Set_Ekind (T_Name, E_Access_Protected_Subprogram_Type);
1241 Set_Convention (Desig_Type, Convention_Protected);
1243 Set_Ekind (T_Name, E_Access_Subprogram_Type);
1246 Set_Can_Use_Internal_Rep (T_Name, not Always_Compatible_Rep_On_Target);
1248 Set_Etype (T_Name, T_Name);
1249 Init_Size_Align (T_Name);
1250 Set_Directly_Designated_Type (T_Name, Desig_Type);
1252 -- Ada 2005 (AI-231): Propagate the null-excluding attribute
1254 Set_Can_Never_Be_Null (T_Name, Null_Exclusion_Present (T_Def));
1256 Check_Restriction (No_Access_Subprograms, T_Def);
1257 end Access_Subprogram_Declaration;
1259 ----------------------------
1260 -- Access_Type_Declaration --
1261 ----------------------------
1263 procedure Access_Type_Declaration (T : Entity_Id; Def : Node_Id) is
1264 S : constant Node_Id := Subtype_Indication (Def);
1265 P : constant Node_Id := Parent (Def);
1267 -- Check for permissible use of incomplete type
1269 if Nkind (S) /= N_Subtype_Indication then
1272 if Ekind (Root_Type (Entity (S))) = E_Incomplete_Type then
1273 Set_Directly_Designated_Type (T, Entity (S));
1275 Set_Directly_Designated_Type (T,
1276 Process_Subtype (S, P, T, 'P'));
1280 Set_Directly_Designated_Type (T,
1281 Process_Subtype (S, P, T, 'P'));
1284 if All_Present (Def) or Constant_Present (Def) then
1285 Set_Ekind (T, E_General_Access_Type);
1287 Set_Ekind (T, E_Access_Type);
1290 if Base_Type (Designated_Type (T)) = T then
1291 Error_Msg_N ("access type cannot designate itself", S);
1293 -- In Ada 2005, the type may have a limited view through some unit
1294 -- in its own context, allowing the following circularity that cannot
1295 -- be detected earlier
1297 elsif Is_Class_Wide_Type (Designated_Type (T))
1298 and then Etype (Designated_Type (T)) = T
1301 ("access type cannot designate its own classwide type", S);
1303 -- Clean up indication of tagged status to prevent cascaded errors
1305 Set_Is_Tagged_Type (T, False);
1310 -- If the type has appeared already in a with_type clause, it is
1311 -- frozen and the pointer size is already set. Else, initialize.
1313 if not From_With_Type (T) then
1314 Init_Size_Align (T);
1317 -- Note that Has_Task is always false, since the access type itself
1318 -- is not a task type. See Einfo for more description on this point.
1319 -- Exactly the same consideration applies to Has_Controlled_Component.
1321 Set_Has_Task (T, False);
1322 Set_Has_Controlled_Component (T, False);
1324 -- Initialize Associated_Final_Chain explicitly to Empty, to avoid
1325 -- problems where an incomplete view of this entity has been previously
1326 -- established by a limited with and an overlaid version of this field
1327 -- (Stored_Constraint) was initialized for the incomplete view.
1329 Set_Associated_Final_Chain (T, Empty);
1331 -- Ada 2005 (AI-231): Propagate the null-excluding and access-constant
1334 Set_Can_Never_Be_Null (T, Null_Exclusion_Present (Def));
1335 Set_Is_Access_Constant (T, Constant_Present (Def));
1336 end Access_Type_Declaration;
1338 ----------------------------------
1339 -- Add_Interface_Tag_Components --
1340 ----------------------------------
1342 procedure Add_Interface_Tag_Components (N : Node_Id; Typ : Entity_Id) is
1343 Loc : constant Source_Ptr := Sloc (N);
1347 procedure Add_Tag (Iface : Entity_Id);
1348 -- Add tag for one of the progenitor interfaces
1354 procedure Add_Tag (Iface : Entity_Id) is
1361 pragma Assert (Is_Tagged_Type (Iface)
1362 and then Is_Interface (Iface));
1364 -- This is a reasonable place to propagate predicates
1366 if Has_Predicates (Iface) then
1367 Set_Has_Predicates (Typ);
1371 Make_Component_Definition (Loc,
1372 Aliased_Present => True,
1373 Subtype_Indication =>
1374 New_Occurrence_Of (RTE (RE_Interface_Tag), Loc));
1376 Tag := Make_Temporary (Loc, 'V');
1379 Make_Component_Declaration (Loc,
1380 Defining_Identifier => Tag,
1381 Component_Definition => Def);
1383 Analyze_Component_Declaration (Decl);
1385 Set_Analyzed (Decl);
1386 Set_Ekind (Tag, E_Component);
1388 Set_Is_Aliased (Tag);
1389 Set_Related_Type (Tag, Iface);
1390 Init_Component_Location (Tag);
1392 pragma Assert (Is_Frozen (Iface));
1394 Set_DT_Entry_Count (Tag,
1395 DT_Entry_Count (First_Entity (Iface)));
1397 if No (Last_Tag) then
1400 Insert_After (Last_Tag, Decl);
1405 -- If the ancestor has discriminants we need to give special support
1406 -- to store the offset_to_top value of the secondary dispatch tables.
1407 -- For this purpose we add a supplementary component just after the
1408 -- field that contains the tag associated with each secondary DT.
1410 if Typ /= Etype (Typ)
1411 and then Has_Discriminants (Etype (Typ))
1414 Make_Component_Definition (Loc,
1415 Subtype_Indication =>
1416 New_Occurrence_Of (RTE (RE_Storage_Offset), Loc));
1418 Offset := Make_Temporary (Loc, 'V');
1421 Make_Component_Declaration (Loc,
1422 Defining_Identifier => Offset,
1423 Component_Definition => Def);
1425 Analyze_Component_Declaration (Decl);
1427 Set_Analyzed (Decl);
1428 Set_Ekind (Offset, E_Component);
1429 Set_Is_Aliased (Offset);
1430 Set_Related_Type (Offset, Iface);
1431 Init_Component_Location (Offset);
1432 Insert_After (Last_Tag, Decl);
1443 -- Start of processing for Add_Interface_Tag_Components
1446 if not RTE_Available (RE_Interface_Tag) then
1448 ("(Ada 2005) interface types not supported by this run-time!",
1453 if Ekind (Typ) /= E_Record_Type
1454 or else (Is_Concurrent_Record_Type (Typ)
1455 and then Is_Empty_List (Abstract_Interface_List (Typ)))
1456 or else (not Is_Concurrent_Record_Type (Typ)
1457 and then No (Interfaces (Typ))
1458 and then Is_Empty_Elmt_List (Interfaces (Typ)))
1463 -- Find the current last tag
1465 if Nkind (Type_Definition (N)) = N_Derived_Type_Definition then
1466 Ext := Record_Extension_Part (Type_Definition (N));
1468 pragma Assert (Nkind (Type_Definition (N)) = N_Record_Definition);
1469 Ext := Type_Definition (N);
1474 if not (Present (Component_List (Ext))) then
1475 Set_Null_Present (Ext, False);
1477 Set_Component_List (Ext,
1478 Make_Component_List (Loc,
1479 Component_Items => L,
1480 Null_Present => False));
1482 if Nkind (Type_Definition (N)) = N_Derived_Type_Definition then
1483 L := Component_Items
1485 (Record_Extension_Part
1486 (Type_Definition (N))));
1488 L := Component_Items
1490 (Type_Definition (N)));
1493 -- Find the last tag component
1496 while Present (Comp) loop
1497 if Nkind (Comp) = N_Component_Declaration
1498 and then Is_Tag (Defining_Identifier (Comp))
1507 -- At this point L references the list of components and Last_Tag
1508 -- references the current last tag (if any). Now we add the tag
1509 -- corresponding with all the interfaces that are not implemented
1512 if Present (Interfaces (Typ)) then
1513 Elmt := First_Elmt (Interfaces (Typ));
1514 while Present (Elmt) loop
1515 Add_Tag (Node (Elmt));
1519 end Add_Interface_Tag_Components;
1521 -------------------------------------
1522 -- Add_Internal_Interface_Entities --
1523 -------------------------------------
1525 procedure Add_Internal_Interface_Entities (Tagged_Type : Entity_Id) is
1528 Iface_Elmt : Elmt_Id;
1529 Iface_Prim : Entity_Id;
1530 Ifaces_List : Elist_Id;
1531 New_Subp : Entity_Id := Empty;
1533 Restore_Scope : Boolean := False;
1536 pragma Assert (Ada_Version >= Ada_2005
1537 and then Is_Record_Type (Tagged_Type)
1538 and then Is_Tagged_Type (Tagged_Type)
1539 and then Has_Interfaces (Tagged_Type)
1540 and then not Is_Interface (Tagged_Type));
1542 -- Ensure that the internal entities are added to the scope of the type
1544 if Scope (Tagged_Type) /= Current_Scope then
1545 Push_Scope (Scope (Tagged_Type));
1546 Restore_Scope := True;
1549 Collect_Interfaces (Tagged_Type, Ifaces_List);
1551 Iface_Elmt := First_Elmt (Ifaces_List);
1552 while Present (Iface_Elmt) loop
1553 Iface := Node (Iface_Elmt);
1555 -- Originally we excluded here from this processing interfaces that
1556 -- are parents of Tagged_Type because their primitives are located
1557 -- in the primary dispatch table (and hence no auxiliary internal
1558 -- entities are required to handle secondary dispatch tables in such
1559 -- case). However, these auxiliary entities are also required to
1560 -- handle derivations of interfaces in formals of generics (see
1561 -- Derive_Subprograms).
1563 Elmt := First_Elmt (Primitive_Operations (Iface));
1564 while Present (Elmt) loop
1565 Iface_Prim := Node (Elmt);
1567 if not Is_Predefined_Dispatching_Operation (Iface_Prim) then
1569 Find_Primitive_Covering_Interface
1570 (Tagged_Type => Tagged_Type,
1571 Iface_Prim => Iface_Prim);
1573 pragma Assert (Present (Prim));
1576 (New_Subp => New_Subp,
1577 Parent_Subp => Iface_Prim,
1578 Derived_Type => Tagged_Type,
1579 Parent_Type => Iface);
1581 -- Ada 2005 (AI-251): Decorate internal entity Iface_Subp
1582 -- associated with interface types. These entities are
1583 -- only registered in the list of primitives of its
1584 -- corresponding tagged type because they are only used
1585 -- to fill the contents of the secondary dispatch tables.
1586 -- Therefore they are removed from the homonym chains.
1588 Set_Is_Hidden (New_Subp);
1589 Set_Is_Internal (New_Subp);
1590 Set_Alias (New_Subp, Prim);
1591 Set_Is_Abstract_Subprogram
1592 (New_Subp, Is_Abstract_Subprogram (Prim));
1593 Set_Interface_Alias (New_Subp, Iface_Prim);
1595 -- Internal entities associated with interface types are
1596 -- only registered in the list of primitives of the tagged
1597 -- type. They are only used to fill the contents of the
1598 -- secondary dispatch tables. Therefore they are not needed
1599 -- in the homonym chains.
1601 Remove_Homonym (New_Subp);
1603 -- Hidden entities associated with interfaces must have set
1604 -- the Has_Delay_Freeze attribute to ensure that, in case of
1605 -- locally defined tagged types (or compiling with static
1606 -- dispatch tables generation disabled) the corresponding
1607 -- entry of the secondary dispatch table is filled when
1608 -- such an entity is frozen.
1610 Set_Has_Delayed_Freeze (New_Subp);
1616 Next_Elmt (Iface_Elmt);
1619 if Restore_Scope then
1622 end Add_Internal_Interface_Entities;
1624 -----------------------------------
1625 -- Analyze_Component_Declaration --
1626 -----------------------------------
1628 procedure Analyze_Component_Declaration (N : Node_Id) is
1629 Id : constant Entity_Id := Defining_Identifier (N);
1630 E : constant Node_Id := Expression (N);
1634 function Contains_POC (Constr : Node_Id) return Boolean;
1635 -- Determines whether a constraint uses the discriminant of a record
1636 -- type thus becoming a per-object constraint (POC).
1638 function Is_Known_Limited (Typ : Entity_Id) return Boolean;
1639 -- Typ is the type of the current component, check whether this type is
1640 -- a limited type. Used to validate declaration against that of
1641 -- enclosing record.
1647 function Contains_POC (Constr : Node_Id) return Boolean is
1649 -- Prevent cascaded errors
1651 if Error_Posted (Constr) then
1655 case Nkind (Constr) is
1656 when N_Attribute_Reference =>
1658 Attribute_Name (Constr) = Name_Access
1659 and then Prefix (Constr) = Scope (Entity (Prefix (Constr)));
1661 when N_Discriminant_Association =>
1662 return Denotes_Discriminant (Expression (Constr));
1664 when N_Identifier =>
1665 return Denotes_Discriminant (Constr);
1667 when N_Index_Or_Discriminant_Constraint =>
1672 IDC := First (Constraints (Constr));
1673 while Present (IDC) loop
1675 -- One per-object constraint is sufficient
1677 if Contains_POC (IDC) then
1688 return Denotes_Discriminant (Low_Bound (Constr))
1690 Denotes_Discriminant (High_Bound (Constr));
1692 when N_Range_Constraint =>
1693 return Denotes_Discriminant (Range_Expression (Constr));
1701 ----------------------
1702 -- Is_Known_Limited --
1703 ----------------------
1705 function Is_Known_Limited (Typ : Entity_Id) return Boolean is
1706 P : constant Entity_Id := Etype (Typ);
1707 R : constant Entity_Id := Root_Type (Typ);
1710 if Is_Limited_Record (Typ) then
1713 -- If the root type is limited (and not a limited interface)
1714 -- so is the current type
1716 elsif Is_Limited_Record (R)
1718 (not Is_Interface (R)
1719 or else not Is_Limited_Interface (R))
1723 -- Else the type may have a limited interface progenitor, but a
1724 -- limited record parent.
1727 and then Is_Limited_Record (P)
1734 end Is_Known_Limited;
1736 -- Start of processing for Analyze_Component_Declaration
1739 Generate_Definition (Id);
1742 if Present (Subtype_Indication (Component_Definition (N))) then
1743 T := Find_Type_Of_Object
1744 (Subtype_Indication (Component_Definition (N)), N);
1746 -- Ada 2005 (AI-230): Access Definition case
1749 pragma Assert (Present
1750 (Access_Definition (Component_Definition (N))));
1752 T := Access_Definition
1754 N => Access_Definition (Component_Definition (N)));
1755 Set_Is_Local_Anonymous_Access (T);
1757 -- Ada 2005 (AI-254)
1759 if Present (Access_To_Subprogram_Definition
1760 (Access_Definition (Component_Definition (N))))
1761 and then Protected_Present (Access_To_Subprogram_Definition
1763 (Component_Definition (N))))
1765 T := Replace_Anonymous_Access_To_Protected_Subprogram (N);
1769 -- If the subtype is a constrained subtype of the enclosing record,
1770 -- (which must have a partial view) the back-end does not properly
1771 -- handle the recursion. Rewrite the component declaration with an
1772 -- explicit subtype indication, which is acceptable to Gigi. We can copy
1773 -- the tree directly because side effects have already been removed from
1774 -- discriminant constraints.
1776 if Ekind (T) = E_Access_Subtype
1777 and then Is_Entity_Name (Subtype_Indication (Component_Definition (N)))
1778 and then Comes_From_Source (T)
1779 and then Nkind (Parent (T)) = N_Subtype_Declaration
1780 and then Etype (Directly_Designated_Type (T)) = Current_Scope
1783 (Subtype_Indication (Component_Definition (N)),
1784 New_Copy_Tree (Subtype_Indication (Parent (T))));
1785 T := Find_Type_Of_Object
1786 (Subtype_Indication (Component_Definition (N)), N);
1789 -- If the component declaration includes a default expression, then we
1790 -- check that the component is not of a limited type (RM 3.7(5)),
1791 -- and do the special preanalysis of the expression (see section on
1792 -- "Handling of Default and Per-Object Expressions" in the spec of
1796 Preanalyze_Spec_Expression (E, T);
1797 Check_Initialization (T, E);
1799 if Ada_Version >= Ada_2005
1800 and then Ekind (T) = E_Anonymous_Access_Type
1801 and then Etype (E) /= Any_Type
1803 -- Check RM 3.9.2(9): "if the expected type for an expression is
1804 -- an anonymous access-to-specific tagged type, then the object
1805 -- designated by the expression shall not be dynamically tagged
1806 -- unless it is a controlling operand in a call on a dispatching
1809 if Is_Tagged_Type (Directly_Designated_Type (T))
1811 Ekind (Directly_Designated_Type (T)) /= E_Class_Wide_Type
1813 Ekind (Directly_Designated_Type (Etype (E))) =
1817 ("access to specific tagged type required (RM 3.9.2(9))", E);
1820 -- (Ada 2005: AI-230): Accessibility check for anonymous
1823 if Type_Access_Level (Etype (E)) > Type_Access_Level (T) then
1825 ("expression has deeper access level than component " &
1826 "(RM 3.10.2 (12.2))", E);
1829 -- The initialization expression is a reference to an access
1830 -- discriminant. The type of the discriminant is always deeper
1831 -- than any access type.
1833 if Ekind (Etype (E)) = E_Anonymous_Access_Type
1834 and then Is_Entity_Name (E)
1835 and then Ekind (Entity (E)) = E_In_Parameter
1836 and then Present (Discriminal_Link (Entity (E)))
1839 ("discriminant has deeper accessibility level than target",
1845 -- The parent type may be a private view with unknown discriminants,
1846 -- and thus unconstrained. Regular components must be constrained.
1848 if Is_Indefinite_Subtype (T) and then Chars (Id) /= Name_uParent then
1849 if Is_Class_Wide_Type (T) then
1851 ("class-wide subtype with unknown discriminants" &
1852 " in component declaration",
1853 Subtype_Indication (Component_Definition (N)));
1856 ("unconstrained subtype in component declaration",
1857 Subtype_Indication (Component_Definition (N)));
1860 -- Components cannot be abstract, except for the special case of
1861 -- the _Parent field (case of extending an abstract tagged type)
1863 elsif Is_Abstract_Type (T) and then Chars (Id) /= Name_uParent then
1864 Error_Msg_N ("type of a component cannot be abstract", N);
1868 Set_Is_Aliased (Id, Aliased_Present (Component_Definition (N)));
1870 -- The component declaration may have a per-object constraint, set
1871 -- the appropriate flag in the defining identifier of the subtype.
1873 if Present (Subtype_Indication (Component_Definition (N))) then
1875 Sindic : constant Node_Id :=
1876 Subtype_Indication (Component_Definition (N));
1878 if Nkind (Sindic) = N_Subtype_Indication
1879 and then Present (Constraint (Sindic))
1880 and then Contains_POC (Constraint (Sindic))
1882 Set_Has_Per_Object_Constraint (Id);
1887 -- Ada 2005 (AI-231): Propagate the null-excluding attribute and carry
1888 -- out some static checks.
1890 if Ada_Version >= Ada_2005
1891 and then Can_Never_Be_Null (T)
1893 Null_Exclusion_Static_Checks (N);
1896 -- If this component is private (or depends on a private type), flag the
1897 -- record type to indicate that some operations are not available.
1899 P := Private_Component (T);
1903 -- Check for circular definitions
1905 if P = Any_Type then
1906 Set_Etype (Id, Any_Type);
1908 -- There is a gap in the visibility of operations only if the
1909 -- component type is not defined in the scope of the record type.
1911 elsif Scope (P) = Scope (Current_Scope) then
1914 elsif Is_Limited_Type (P) then
1915 Set_Is_Limited_Composite (Current_Scope);
1918 Set_Is_Private_Composite (Current_Scope);
1923 and then Is_Limited_Type (T)
1924 and then Chars (Id) /= Name_uParent
1925 and then Is_Tagged_Type (Current_Scope)
1927 if Is_Derived_Type (Current_Scope)
1928 and then not Is_Known_Limited (Current_Scope)
1931 ("extension of nonlimited type cannot have limited components",
1934 if Is_Interface (Root_Type (Current_Scope)) then
1936 ("\limitedness is not inherited from limited interface", N);
1937 Error_Msg_N ("\add LIMITED to type indication", N);
1940 Explain_Limited_Type (T, N);
1941 Set_Etype (Id, Any_Type);
1942 Set_Is_Limited_Composite (Current_Scope, False);
1944 elsif not Is_Derived_Type (Current_Scope)
1945 and then not Is_Limited_Record (Current_Scope)
1946 and then not Is_Concurrent_Type (Current_Scope)
1949 ("nonlimited tagged type cannot have limited components", N);
1950 Explain_Limited_Type (T, N);
1951 Set_Etype (Id, Any_Type);
1952 Set_Is_Limited_Composite (Current_Scope, False);
1956 Set_Original_Record_Component (Id, Id);
1957 Analyze_Aspect_Specifications (N, Id, Aspect_Specifications (N));
1958 end Analyze_Component_Declaration;
1960 --------------------------
1961 -- Analyze_Declarations --
1962 --------------------------
1964 procedure Analyze_Declarations (L : List_Id) is
1966 Freeze_From : Entity_Id := Empty;
1967 Next_Node : Node_Id;
1970 -- Adjust D not to include implicit label declarations, since these
1971 -- have strange Sloc values that result in elaboration check problems.
1972 -- (They have the sloc of the label as found in the source, and that
1973 -- is ahead of the current declarative part).
1979 procedure Adjust_D is
1981 while Present (Prev (D))
1982 and then Nkind (D) = N_Implicit_Label_Declaration
1988 -- Start of processing for Analyze_Declarations
1992 while Present (D) loop
1994 -- Complete analysis of declaration
1997 Next_Node := Next (D);
1999 if No (Freeze_From) then
2000 Freeze_From := First_Entity (Current_Scope);
2003 -- At the end of a declarative part, freeze remaining entities
2004 -- declared in it. The end of the visible declarations of package
2005 -- specification is not the end of a declarative part if private
2006 -- declarations are present. The end of a package declaration is a
2007 -- freezing point only if it a library package. A task definition or
2008 -- protected type definition is not a freeze point either. Finally,
2009 -- we do not freeze entities in generic scopes, because there is no
2010 -- code generated for them and freeze nodes will be generated for
2013 -- The end of a package instantiation is not a freeze point, but
2014 -- for now we make it one, because the generic body is inserted
2015 -- (currently) immediately after. Generic instantiations will not
2016 -- be a freeze point once delayed freezing of bodies is implemented.
2017 -- (This is needed in any case for early instantiations ???).
2019 if No (Next_Node) then
2020 if Nkind_In (Parent (L), N_Component_List,
2022 N_Protected_Definition)
2026 elsif Nkind (Parent (L)) /= N_Package_Specification then
2027 if Nkind (Parent (L)) = N_Package_Body then
2028 Freeze_From := First_Entity (Current_Scope);
2032 Freeze_All (Freeze_From, D);
2033 Freeze_From := Last_Entity (Current_Scope);
2035 elsif Scope (Current_Scope) /= Standard_Standard
2036 and then not Is_Child_Unit (Current_Scope)
2037 and then No (Generic_Parent (Parent (L)))
2041 elsif L /= Visible_Declarations (Parent (L))
2042 or else No (Private_Declarations (Parent (L)))
2043 or else Is_Empty_List (Private_Declarations (Parent (L)))
2046 Freeze_All (Freeze_From, D);
2047 Freeze_From := Last_Entity (Current_Scope);
2050 -- If next node is a body then freeze all types before the body.
2051 -- An exception occurs for some expander-generated bodies. If these
2052 -- are generated at places where in general language rules would not
2053 -- allow a freeze point, then we assume that the expander has
2054 -- explicitly checked that all required types are properly frozen,
2055 -- and we do not cause general freezing here. This special circuit
2056 -- is used when the encountered body is marked as having already
2059 -- In all other cases (bodies that come from source, and expander
2060 -- generated bodies that have not been analyzed yet), freeze all
2061 -- types now. Note that in the latter case, the expander must take
2062 -- care to attach the bodies at a proper place in the tree so as to
2063 -- not cause unwanted freezing at that point.
2065 elsif not Analyzed (Next_Node)
2066 and then (Nkind_In (Next_Node, N_Subprogram_Body,
2072 Nkind (Next_Node) in N_Body_Stub)
2075 Freeze_All (Freeze_From, D);
2076 Freeze_From := Last_Entity (Current_Scope);
2082 -- One more thing to do, we need to scan the declarations to check
2083 -- for any precondition/postcondition pragmas (Pre/Post aspects have
2084 -- by this stage been converted into corresponding pragmas). It is
2085 -- at this point that we analyze the expressions in such pragmas,
2086 -- to implement the delayed visibility requirement.
2096 while Present (Decl) loop
2097 if Nkind (Original_Node (Decl)) = N_Subprogram_Declaration then
2098 Spec := Specification (Original_Node (Decl));
2099 Sent := Defining_Unit_Name (Spec);
2100 Prag := Spec_PPC_List (Sent);
2101 while Present (Prag) loop
2102 Analyze_PPC_In_Decl_Part (Prag, Sent);
2103 Prag := Next_Pragma (Prag);
2110 end Analyze_Declarations;
2112 -----------------------------------
2113 -- Analyze_Full_Type_Declaration --
2114 -----------------------------------
2116 procedure Analyze_Full_Type_Declaration (N : Node_Id) is
2117 Def : constant Node_Id := Type_Definition (N);
2118 Def_Id : constant Entity_Id := Defining_Identifier (N);
2122 Is_Remote : constant Boolean :=
2123 (Is_Remote_Types (Current_Scope)
2124 or else Is_Remote_Call_Interface (Current_Scope))
2125 and then not (In_Private_Part (Current_Scope)
2126 or else In_Package_Body (Current_Scope));
2128 procedure Check_Ops_From_Incomplete_Type;
2129 -- If there is a tagged incomplete partial view of the type, transfer
2130 -- its operations to the full view, and indicate that the type of the
2131 -- controlling parameter (s) is this full view.
2133 ------------------------------------
2134 -- Check_Ops_From_Incomplete_Type --
2135 ------------------------------------
2137 procedure Check_Ops_From_Incomplete_Type is
2144 and then Ekind (Prev) = E_Incomplete_Type
2145 and then Is_Tagged_Type (Prev)
2146 and then Is_Tagged_Type (T)
2148 Elmt := First_Elmt (Primitive_Operations (Prev));
2149 while Present (Elmt) loop
2151 Prepend_Elmt (Op, Primitive_Operations (T));
2153 Formal := First_Formal (Op);
2154 while Present (Formal) loop
2155 if Etype (Formal) = Prev then
2156 Set_Etype (Formal, T);
2159 Next_Formal (Formal);
2162 if Etype (Op) = Prev then
2169 end Check_Ops_From_Incomplete_Type;
2171 -- Start of processing for Analyze_Full_Type_Declaration
2174 Prev := Find_Type_Name (N);
2176 -- The full view, if present, now points to the current type
2178 -- Ada 2005 (AI-50217): If the type was previously decorated when
2179 -- imported through a LIMITED WITH clause, it appears as incomplete
2180 -- but has no full view.
2182 if Ekind (Prev) = E_Incomplete_Type
2183 and then Present (Full_View (Prev))
2185 T := Full_View (Prev);
2190 Set_Is_Pure (T, Is_Pure (Current_Scope));
2192 -- We set the flag Is_First_Subtype here. It is needed to set the
2193 -- corresponding flag for the Implicit class-wide-type created
2194 -- during tagged types processing.
2196 Set_Is_First_Subtype (T, True);
2198 -- Only composite types other than array types are allowed to have
2203 -- For derived types, the rule will be checked once we've figured
2204 -- out the parent type.
2206 when N_Derived_Type_Definition =>
2209 -- For record types, discriminants are allowed
2211 when N_Record_Definition =>
2215 if Present (Discriminant_Specifications (N)) then
2217 ("elementary or array type cannot have discriminants",
2219 (First (Discriminant_Specifications (N))));
2223 -- Elaborate the type definition according to kind, and generate
2224 -- subsidiary (implicit) subtypes where needed. We skip this if it was
2225 -- already done (this happens during the reanalysis that follows a call
2226 -- to the high level optimizer).
2228 if not Analyzed (T) then
2233 when N_Access_To_Subprogram_Definition =>
2234 Access_Subprogram_Declaration (T, Def);
2236 -- If this is a remote access to subprogram, we must create the
2237 -- equivalent fat pointer type, and related subprograms.
2240 Process_Remote_AST_Declaration (N);
2243 -- Validate categorization rule against access type declaration
2244 -- usually a violation in Pure unit, Shared_Passive unit.
2246 Validate_Access_Type_Declaration (T, N);
2248 when N_Access_To_Object_Definition =>
2249 Access_Type_Declaration (T, Def);
2251 -- Validate categorization rule against access type declaration
2252 -- usually a violation in Pure unit, Shared_Passive unit.
2254 Validate_Access_Type_Declaration (T, N);
2256 -- If we are in a Remote_Call_Interface package and define a
2257 -- RACW, then calling stubs and specific stream attributes
2261 and then Is_Remote_Access_To_Class_Wide_Type (Def_Id)
2263 Add_RACW_Features (Def_Id);
2266 -- Set no strict aliasing flag if config pragma seen
2268 if Opt.No_Strict_Aliasing then
2269 Set_No_Strict_Aliasing (Base_Type (Def_Id));
2272 when N_Array_Type_Definition =>
2273 Array_Type_Declaration (T, Def);
2275 when N_Derived_Type_Definition =>
2276 Derived_Type_Declaration (T, N, T /= Def_Id);
2278 when N_Enumeration_Type_Definition =>
2279 Enumeration_Type_Declaration (T, Def);
2281 when N_Floating_Point_Definition =>
2282 Floating_Point_Type_Declaration (T, Def);
2284 when N_Decimal_Fixed_Point_Definition =>
2285 Decimal_Fixed_Point_Type_Declaration (T, Def);
2287 when N_Ordinary_Fixed_Point_Definition =>
2288 Ordinary_Fixed_Point_Type_Declaration (T, Def);
2290 when N_Signed_Integer_Type_Definition =>
2291 Signed_Integer_Type_Declaration (T, Def);
2293 when N_Modular_Type_Definition =>
2294 Modular_Type_Declaration (T, Def);
2296 when N_Record_Definition =>
2297 Record_Type_Declaration (T, N, Prev);
2299 -- If declaration has a parse error, nothing to elaborate.
2305 raise Program_Error;
2310 if Etype (T) = Any_Type then
2314 -- Some common processing for all types
2316 Set_Depends_On_Private (T, Has_Private_Component (T));
2317 Check_Ops_From_Incomplete_Type;
2319 -- Both the declared entity, and its anonymous base type if one
2320 -- was created, need freeze nodes allocated.
2323 B : constant Entity_Id := Base_Type (T);
2326 -- In the case where the base type differs from the first subtype, we
2327 -- pre-allocate a freeze node, and set the proper link to the first
2328 -- subtype. Freeze_Entity will use this preallocated freeze node when
2329 -- it freezes the entity.
2331 -- This does not apply if the base type is a generic type, whose
2332 -- declaration is independent of the current derived definition.
2334 if B /= T and then not Is_Generic_Type (B) then
2335 Ensure_Freeze_Node (B);
2336 Set_First_Subtype_Link (Freeze_Node (B), T);
2339 -- A type that is imported through a limited_with clause cannot
2340 -- generate any code, and thus need not be frozen. However, an access
2341 -- type with an imported designated type needs a finalization list,
2342 -- which may be referenced in some other package that has non-limited
2343 -- visibility on the designated type. Thus we must create the
2344 -- finalization list at the point the access type is frozen, to
2345 -- prevent unsatisfied references at link time.
2347 if not From_With_Type (T) or else Is_Access_Type (T) then
2348 Set_Has_Delayed_Freeze (T);
2352 -- Case where T is the full declaration of some private type which has
2353 -- been swapped in Defining_Identifier (N).
2355 if T /= Def_Id and then Is_Private_Type (Def_Id) then
2356 Process_Full_View (N, T, Def_Id);
2358 -- Record the reference. The form of this is a little strange, since
2359 -- the full declaration has been swapped in. So the first parameter
2360 -- here represents the entity to which a reference is made which is
2361 -- the "real" entity, i.e. the one swapped in, and the second
2362 -- parameter provides the reference location.
2364 -- Also, we want to kill Has_Pragma_Unreferenced temporarily here
2365 -- since we don't want a complaint about the full type being an
2366 -- unwanted reference to the private type
2369 B : constant Boolean := Has_Pragma_Unreferenced (T);
2371 Set_Has_Pragma_Unreferenced (T, False);
2372 Generate_Reference (T, T, 'c');
2373 Set_Has_Pragma_Unreferenced (T, B);
2376 Set_Completion_Referenced (Def_Id);
2378 -- For completion of incomplete type, process incomplete dependents
2379 -- and always mark the full type as referenced (it is the incomplete
2380 -- type that we get for any real reference).
2382 elsif Ekind (Prev) = E_Incomplete_Type then
2383 Process_Incomplete_Dependents (N, T, Prev);
2384 Generate_Reference (Prev, Def_Id, 'c');
2385 Set_Completion_Referenced (Def_Id);
2387 -- If not private type or incomplete type completion, this is a real
2388 -- definition of a new entity, so record it.
2391 Generate_Definition (Def_Id);
2394 if Chars (Scope (Def_Id)) = Name_System
2395 and then Chars (Def_Id) = Name_Address
2396 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (N)))
2398 Set_Is_Descendent_Of_Address (Def_Id);
2399 Set_Is_Descendent_Of_Address (Base_Type (Def_Id));
2400 Set_Is_Descendent_Of_Address (Prev);
2403 Set_Optimize_Alignment_Flags (Def_Id);
2404 Check_Eliminated (Def_Id);
2406 Analyze_Aspect_Specifications (N, Def_Id, Aspect_Specifications (N));
2407 end Analyze_Full_Type_Declaration;
2409 ----------------------------------
2410 -- Analyze_Incomplete_Type_Decl --
2411 ----------------------------------
2413 procedure Analyze_Incomplete_Type_Decl (N : Node_Id) is
2414 F : constant Boolean := Is_Pure (Current_Scope);
2418 Generate_Definition (Defining_Identifier (N));
2420 -- Process an incomplete declaration. The identifier must not have been
2421 -- declared already in the scope. However, an incomplete declaration may
2422 -- appear in the private part of a package, for a private type that has
2423 -- already been declared.
2425 -- In this case, the discriminants (if any) must match
2427 T := Find_Type_Name (N);
2429 Set_Ekind (T, E_Incomplete_Type);
2430 Init_Size_Align (T);
2431 Set_Is_First_Subtype (T, True);
2434 -- Ada 2005 (AI-326): Minimum decoration to give support to tagged
2435 -- incomplete types.
2437 if Tagged_Present (N) then
2438 Set_Is_Tagged_Type (T);
2439 Make_Class_Wide_Type (T);
2440 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2445 Set_Stored_Constraint (T, No_Elist);
2447 if Present (Discriminant_Specifications (N)) then
2448 Process_Discriminants (N);
2453 -- If the type has discriminants, non-trivial subtypes may be
2454 -- declared before the full view of the type. The full views of those
2455 -- subtypes will be built after the full view of the type.
2457 Set_Private_Dependents (T, New_Elmt_List);
2459 end Analyze_Incomplete_Type_Decl;
2461 -----------------------------------
2462 -- Analyze_Interface_Declaration --
2463 -----------------------------------
2465 procedure Analyze_Interface_Declaration (T : Entity_Id; Def : Node_Id) is
2466 CW : constant Entity_Id := Class_Wide_Type (T);
2469 Set_Is_Tagged_Type (T);
2471 Set_Is_Limited_Record (T, Limited_Present (Def)
2472 or else Task_Present (Def)
2473 or else Protected_Present (Def)
2474 or else Synchronized_Present (Def));
2476 -- Type is abstract if full declaration carries keyword, or if previous
2477 -- partial view did.
2479 Set_Is_Abstract_Type (T);
2480 Set_Is_Interface (T);
2482 -- Type is a limited interface if it includes the keyword limited, task,
2483 -- protected, or synchronized.
2485 Set_Is_Limited_Interface
2486 (T, Limited_Present (Def)
2487 or else Protected_Present (Def)
2488 or else Synchronized_Present (Def)
2489 or else Task_Present (Def));
2491 Set_Interfaces (T, New_Elmt_List);
2492 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2494 -- Complete the decoration of the class-wide entity if it was already
2495 -- built (i.e. during the creation of the limited view)
2497 if Present (CW) then
2498 Set_Is_Interface (CW);
2499 Set_Is_Limited_Interface (CW, Is_Limited_Interface (T));
2502 -- Check runtime support for synchronized interfaces
2504 if VM_Target = No_VM
2505 and then (Is_Task_Interface (T)
2506 or else Is_Protected_Interface (T)
2507 or else Is_Synchronized_Interface (T))
2508 and then not RTE_Available (RE_Select_Specific_Data)
2510 Error_Msg_CRT ("synchronized interfaces", T);
2512 end Analyze_Interface_Declaration;
2514 -----------------------------
2515 -- Analyze_Itype_Reference --
2516 -----------------------------
2518 -- Nothing to do. This node is placed in the tree only for the benefit of
2519 -- back end processing, and has no effect on the semantic processing.
2521 procedure Analyze_Itype_Reference (N : Node_Id) is
2523 pragma Assert (Is_Itype (Itype (N)));
2525 end Analyze_Itype_Reference;
2527 --------------------------------
2528 -- Analyze_Number_Declaration --
2529 --------------------------------
2531 procedure Analyze_Number_Declaration (N : Node_Id) is
2532 Id : constant Entity_Id := Defining_Identifier (N);
2533 E : constant Node_Id := Expression (N);
2535 Index : Interp_Index;
2539 Generate_Definition (Id);
2542 -- This is an optimization of a common case of an integer literal
2544 if Nkind (E) = N_Integer_Literal then
2545 Set_Is_Static_Expression (E, True);
2546 Set_Etype (E, Universal_Integer);
2548 Set_Etype (Id, Universal_Integer);
2549 Set_Ekind (Id, E_Named_Integer);
2550 Set_Is_Frozen (Id, True);
2554 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2556 -- Process expression, replacing error by integer zero, to avoid
2557 -- cascaded errors or aborts further along in the processing
2559 -- Replace Error by integer zero, which seems least likely to
2560 -- cause cascaded errors.
2563 Rewrite (E, Make_Integer_Literal (Sloc (E), Uint_0));
2564 Set_Error_Posted (E);
2569 -- Verify that the expression is static and numeric. If
2570 -- the expression is overloaded, we apply the preference
2571 -- rule that favors root numeric types.
2573 if not Is_Overloaded (E) then
2579 Get_First_Interp (E, Index, It);
2580 while Present (It.Typ) loop
2581 if (Is_Integer_Type (It.Typ)
2582 or else Is_Real_Type (It.Typ))
2583 and then (Scope (Base_Type (It.Typ))) = Standard_Standard
2585 if T = Any_Type then
2588 elsif It.Typ = Universal_Real
2589 or else It.Typ = Universal_Integer
2591 -- Choose universal interpretation over any other
2598 Get_Next_Interp (Index, It);
2602 if Is_Integer_Type (T) then
2604 Set_Etype (Id, Universal_Integer);
2605 Set_Ekind (Id, E_Named_Integer);
2607 elsif Is_Real_Type (T) then
2609 -- Because the real value is converted to universal_real, this is a
2610 -- legal context for a universal fixed expression.
2612 if T = Universal_Fixed then
2614 Loc : constant Source_Ptr := Sloc (N);
2615 Conv : constant Node_Id := Make_Type_Conversion (Loc,
2617 New_Occurrence_Of (Universal_Real, Loc),
2618 Expression => Relocate_Node (E));
2625 elsif T = Any_Fixed then
2626 Error_Msg_N ("illegal context for mixed mode operation", E);
2628 -- Expression is of the form : universal_fixed * integer. Try to
2629 -- resolve as universal_real.
2631 T := Universal_Real;
2636 Set_Etype (Id, Universal_Real);
2637 Set_Ekind (Id, E_Named_Real);
2640 Wrong_Type (E, Any_Numeric);
2644 Set_Ekind (Id, E_Constant);
2645 Set_Never_Set_In_Source (Id, True);
2646 Set_Is_True_Constant (Id, True);
2650 if Nkind_In (E, N_Integer_Literal, N_Real_Literal) then
2651 Set_Etype (E, Etype (Id));
2654 if not Is_OK_Static_Expression (E) then
2655 Flag_Non_Static_Expr
2656 ("non-static expression used in number declaration!", E);
2657 Rewrite (E, Make_Integer_Literal (Sloc (N), 1));
2658 Set_Etype (E, Any_Type);
2660 end Analyze_Number_Declaration;
2662 --------------------------------
2663 -- Analyze_Object_Declaration --
2664 --------------------------------
2666 procedure Analyze_Object_Declaration (N : Node_Id) is
2667 Loc : constant Source_Ptr := Sloc (N);
2668 Id : constant Entity_Id := Defining_Identifier (N);
2672 E : Node_Id := Expression (N);
2673 -- E is set to Expression (N) throughout this routine. When
2674 -- Expression (N) is modified, E is changed accordingly.
2676 Prev_Entity : Entity_Id := Empty;
2678 function Count_Tasks (T : Entity_Id) return Uint;
2679 -- This function is called when a non-generic library level object of a
2680 -- task type is declared. Its function is to count the static number of
2681 -- tasks declared within the type (it is only called if Has_Tasks is set
2682 -- for T). As a side effect, if an array of tasks with non-static bounds
2683 -- or a variant record type is encountered, Check_Restrictions is called
2684 -- indicating the count is unknown.
2690 function Count_Tasks (T : Entity_Id) return Uint is
2696 if Is_Task_Type (T) then
2699 elsif Is_Record_Type (T) then
2700 if Has_Discriminants (T) then
2701 Check_Restriction (Max_Tasks, N);
2706 C := First_Component (T);
2707 while Present (C) loop
2708 V := V + Count_Tasks (Etype (C));
2715 elsif Is_Array_Type (T) then
2716 X := First_Index (T);
2717 V := Count_Tasks (Component_Type (T));
2718 while Present (X) loop
2721 if not Is_Static_Subtype (C) then
2722 Check_Restriction (Max_Tasks, N);
2725 V := V * (UI_Max (Uint_0,
2726 Expr_Value (Type_High_Bound (C)) -
2727 Expr_Value (Type_Low_Bound (C)) + Uint_1));
2740 -- Start of processing for Analyze_Object_Declaration
2743 -- There are three kinds of implicit types generated by an
2744 -- object declaration:
2746 -- 1. Those for generated by the original Object Definition
2748 -- 2. Those generated by the Expression
2750 -- 3. Those used to constrained the Object Definition with the
2751 -- expression constraints when it is unconstrained
2753 -- They must be generated in this order to avoid order of elaboration
2754 -- issues. Thus the first step (after entering the name) is to analyze
2755 -- the object definition.
2757 if Constant_Present (N) then
2758 Prev_Entity := Current_Entity_In_Scope (Id);
2760 if Present (Prev_Entity)
2762 -- If the homograph is an implicit subprogram, it is overridden
2763 -- by the current declaration.
2765 ((Is_Overloadable (Prev_Entity)
2766 and then Is_Inherited_Operation (Prev_Entity))
2768 -- The current object is a discriminal generated for an entry
2769 -- family index. Even though the index is a constant, in this
2770 -- particular context there is no true constant redeclaration.
2771 -- Enter_Name will handle the visibility.
2774 (Is_Discriminal (Id)
2775 and then Ekind (Discriminal_Link (Id)) =
2776 E_Entry_Index_Parameter)
2778 -- The current object is the renaming for a generic declared
2779 -- within the instance.
2782 (Ekind (Prev_Entity) = E_Package
2783 and then Nkind (Parent (Prev_Entity)) =
2784 N_Package_Renaming_Declaration
2785 and then not Comes_From_Source (Prev_Entity)
2786 and then Is_Generic_Instance (Renamed_Entity (Prev_Entity))))
2788 Prev_Entity := Empty;
2792 if Present (Prev_Entity) then
2793 Constant_Redeclaration (Id, N, T);
2795 Generate_Reference (Prev_Entity, Id, 'c');
2796 Set_Completion_Referenced (Id);
2798 if Error_Posted (N) then
2800 -- Type mismatch or illegal redeclaration, Do not analyze
2801 -- expression to avoid cascaded errors.
2803 T := Find_Type_Of_Object (Object_Definition (N), N);
2805 Set_Ekind (Id, E_Variable);
2809 -- In the normal case, enter identifier at the start to catch premature
2810 -- usage in the initialization expression.
2813 Generate_Definition (Id);
2816 Mark_Coextensions (N, Object_Definition (N));
2818 T := Find_Type_Of_Object (Object_Definition (N), N);
2820 if Nkind (Object_Definition (N)) = N_Access_Definition
2822 (Access_To_Subprogram_Definition (Object_Definition (N)))
2823 and then Protected_Present
2824 (Access_To_Subprogram_Definition (Object_Definition (N)))
2826 T := Replace_Anonymous_Access_To_Protected_Subprogram (N);
2829 if Error_Posted (Id) then
2831 Set_Ekind (Id, E_Variable);
2836 -- Ada 2005 (AI-231): Propagate the null-excluding attribute and carry
2837 -- out some static checks
2839 if Ada_Version >= Ada_2005
2840 and then Can_Never_Be_Null (T)
2842 -- In case of aggregates we must also take care of the correct
2843 -- initialization of nested aggregates bug this is done at the
2844 -- point of the analysis of the aggregate (see sem_aggr.adb)
2846 if Present (Expression (N))
2847 and then Nkind (Expression (N)) = N_Aggregate
2853 Save_Typ : constant Entity_Id := Etype (Id);
2855 Set_Etype (Id, T); -- Temp. decoration for static checks
2856 Null_Exclusion_Static_Checks (N);
2857 Set_Etype (Id, Save_Typ);
2862 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2864 -- If deferred constant, make sure context is appropriate. We detect
2865 -- a deferred constant as a constant declaration with no expression.
2866 -- A deferred constant can appear in a package body if its completion
2867 -- is by means of an interface pragma.
2869 if Constant_Present (N)
2872 -- A deferred constant may appear in the declarative part of the
2873 -- following constructs:
2877 -- extended return statements
2880 -- subprogram bodies
2883 -- When declared inside a package spec, a deferred constant must be
2884 -- completed by a full constant declaration or pragma Import. In all
2885 -- other cases, the only proper completion is pragma Import. Extended
2886 -- return statements are flagged as invalid contexts because they do
2887 -- not have a declarative part and so cannot accommodate the pragma.
2889 if Ekind (Current_Scope) = E_Return_Statement then
2891 ("invalid context for deferred constant declaration (RM 7.4)",
2894 ("\declaration requires an initialization expression",
2896 Set_Constant_Present (N, False);
2898 -- In Ada 83, deferred constant must be of private type
2900 elsif not Is_Private_Type (T) then
2901 if Ada_Version = Ada_83 and then Comes_From_Source (N) then
2903 ("(Ada 83) deferred constant must be private type", N);
2907 -- If not a deferred constant, then object declaration freezes its type
2910 Check_Fully_Declared (T, N);
2911 Freeze_Before (N, T);
2914 -- If the object was created by a constrained array definition, then
2915 -- set the link in both the anonymous base type and anonymous subtype
2916 -- that are built to represent the array type to point to the object.
2918 if Nkind (Object_Definition (Declaration_Node (Id))) =
2919 N_Constrained_Array_Definition
2921 Set_Related_Array_Object (T, Id);
2922 Set_Related_Array_Object (Base_Type (T), Id);
2925 -- Special checks for protected objects not at library level
2927 if Is_Protected_Type (T)
2928 and then not Is_Library_Level_Entity (Id)
2930 Check_Restriction (No_Local_Protected_Objects, Id);
2932 -- Protected objects with interrupt handlers must be at library level
2934 -- Ada 2005: this test is not needed (and the corresponding clause
2935 -- in the RM is removed) because accessibility checks are sufficient
2936 -- to make handlers not at the library level illegal.
2938 if Has_Interrupt_Handler (T)
2939 and then Ada_Version < Ada_2005
2942 ("interrupt object can only be declared at library level", Id);
2946 -- The actual subtype of the object is the nominal subtype, unless
2947 -- the nominal one is unconstrained and obtained from the expression.
2951 -- Process initialization expression if present and not in error
2953 if Present (E) and then E /= Error then
2955 -- Generate an error in case of CPP class-wide object initialization.
2956 -- Required because otherwise the expansion of the class-wide
2957 -- assignment would try to use 'size to initialize the object
2958 -- (primitive that is not available in CPP tagged types).
2960 if Is_Class_Wide_Type (Act_T)
2962 (Is_CPP_Class (Root_Type (Etype (Act_T)))
2964 (Present (Full_View (Root_Type (Etype (Act_T))))
2966 Is_CPP_Class (Full_View (Root_Type (Etype (Act_T))))))
2969 ("predefined assignment not available for 'C'P'P tagged types",
2973 Mark_Coextensions (N, E);
2976 -- In case of errors detected in the analysis of the expression,
2977 -- decorate it with the expected type to avoid cascaded errors
2979 if No (Etype (E)) then
2983 -- If an initialization expression is present, then we set the
2984 -- Is_True_Constant flag. It will be reset if this is a variable
2985 -- and it is indeed modified.
2987 Set_Is_True_Constant (Id, True);
2989 -- If we are analyzing a constant declaration, set its completion
2990 -- flag after analyzing and resolving the expression.
2992 if Constant_Present (N) then
2993 Set_Has_Completion (Id);
2996 -- Set type and resolve (type may be overridden later on)
3001 -- If E is null and has been replaced by an N_Raise_Constraint_Error
3002 -- node (which was marked already-analyzed), we need to set the type
3003 -- to something other than Any_Access in order to keep gigi happy.
3005 if Etype (E) = Any_Access then
3009 -- If the object is an access to variable, the initialization
3010 -- expression cannot be an access to constant.
3012 if Is_Access_Type (T)
3013 and then not Is_Access_Constant (T)
3014 and then Is_Access_Type (Etype (E))
3015 and then Is_Access_Constant (Etype (E))
3018 ("access to variable cannot be initialized "
3019 & "with an access-to-constant expression", E);
3022 if not Assignment_OK (N) then
3023 Check_Initialization (T, E);
3026 Check_Unset_Reference (E);
3028 -- If this is a variable, then set current value. If this is a
3029 -- declared constant of a scalar type with a static expression,
3030 -- indicate that it is always valid.
3032 if not Constant_Present (N) then
3033 if Compile_Time_Known_Value (E) then
3034 Set_Current_Value (Id, E);
3037 elsif Is_Scalar_Type (T)
3038 and then Is_OK_Static_Expression (E)
3040 Set_Is_Known_Valid (Id);
3043 -- Deal with setting of null flags
3045 if Is_Access_Type (T) then
3046 if Known_Non_Null (E) then
3047 Set_Is_Known_Non_Null (Id, True);
3048 elsif Known_Null (E)
3049 and then not Can_Never_Be_Null (Id)
3051 Set_Is_Known_Null (Id, True);
3055 -- Check incorrect use of dynamically tagged expressions.
3057 if Is_Tagged_Type (T) then
3058 Check_Dynamically_Tagged_Expression
3064 Apply_Scalar_Range_Check (E, T);
3065 Apply_Static_Length_Check (E, T);
3068 -- If the No_Streams restriction is set, check that the type of the
3069 -- object is not, and does not contain, any subtype derived from
3070 -- Ada.Streams.Root_Stream_Type. Note that we guard the call to
3071 -- Has_Stream just for efficiency reasons. There is no point in
3072 -- spending time on a Has_Stream check if the restriction is not set.
3074 if Restriction_Check_Required (No_Streams) then
3075 if Has_Stream (T) then
3076 Check_Restriction (No_Streams, N);
3080 -- Case of unconstrained type
3082 if Is_Indefinite_Subtype (T) then
3084 -- Nothing to do in deferred constant case
3086 if Constant_Present (N) and then No (E) then
3089 -- Case of no initialization present
3092 if No_Initialization (N) then
3095 elsif Is_Class_Wide_Type (T) then
3097 ("initialization required in class-wide declaration ", N);
3101 ("unconstrained subtype not allowed (need initialization)",
3102 Object_Definition (N));
3104 if Is_Record_Type (T) and then Has_Discriminants (T) then
3106 ("\provide initial value or explicit discriminant values",
3107 Object_Definition (N));
3110 ("\or give default discriminant values for type&",
3111 Object_Definition (N), T);
3113 elsif Is_Array_Type (T) then
3115 ("\provide initial value or explicit array bounds",
3116 Object_Definition (N));
3120 -- Case of initialization present but in error. Set initial
3121 -- expression as absent (but do not make above complaints)
3123 elsif E = Error then
3124 Set_Expression (N, Empty);
3127 -- Case of initialization present
3130 -- Not allowed in Ada 83
3132 if not Constant_Present (N) then
3133 if Ada_Version = Ada_83
3134 and then Comes_From_Source (Object_Definition (N))
3137 ("(Ada 83) unconstrained variable not allowed",
3138 Object_Definition (N));
3142 -- Now we constrain the variable from the initializing expression
3144 -- If the expression is an aggregate, it has been expanded into
3145 -- individual assignments. Retrieve the actual type from the
3146 -- expanded construct.
3148 if Is_Array_Type (T)
3149 and then No_Initialization (N)
3150 and then Nkind (Original_Node (E)) = N_Aggregate
3154 -- In case of class-wide interface object declarations we delay
3155 -- the generation of the equivalent record type declarations until
3156 -- its expansion because there are cases in they are not required.
3158 elsif Is_Interface (T) then
3162 Expand_Subtype_From_Expr (N, T, Object_Definition (N), E);
3163 Act_T := Find_Type_Of_Object (Object_Definition (N), N);
3166 Set_Is_Constr_Subt_For_U_Nominal (Act_T);
3168 if Aliased_Present (N) then
3169 Set_Is_Constr_Subt_For_UN_Aliased (Act_T);
3172 Freeze_Before (N, Act_T);
3173 Freeze_Before (N, T);
3176 elsif Is_Array_Type (T)
3177 and then No_Initialization (N)
3178 and then Nkind (Original_Node (E)) = N_Aggregate
3180 if not Is_Entity_Name (Object_Definition (N)) then
3182 Check_Compile_Time_Size (Act_T);
3184 if Aliased_Present (N) then
3185 Set_Is_Constr_Subt_For_UN_Aliased (Act_T);
3189 -- When the given object definition and the aggregate are specified
3190 -- independently, and their lengths might differ do a length check.
3191 -- This cannot happen if the aggregate is of the form (others =>...)
3193 if not Is_Constrained (T) then
3196 elsif Nkind (E) = N_Raise_Constraint_Error then
3198 -- Aggregate is statically illegal. Place back in declaration
3200 Set_Expression (N, E);
3201 Set_No_Initialization (N, False);
3203 elsif T = Etype (E) then
3206 elsif Nkind (E) = N_Aggregate
3207 and then Present (Component_Associations (E))
3208 and then Present (Choices (First (Component_Associations (E))))
3209 and then Nkind (First
3210 (Choices (First (Component_Associations (E))))) = N_Others_Choice
3215 Apply_Length_Check (E, T);
3218 -- If the type is limited unconstrained with defaulted discriminants and
3219 -- there is no expression, then the object is constrained by the
3220 -- defaults, so it is worthwhile building the corresponding subtype.
3222 elsif (Is_Limited_Record (T) or else Is_Concurrent_Type (T))
3223 and then not Is_Constrained (T)
3224 and then Has_Discriminants (T)
3227 Act_T := Build_Default_Subtype (T, N);
3229 -- Ada 2005: a limited object may be initialized by means of an
3230 -- aggregate. If the type has default discriminants it has an
3231 -- unconstrained nominal type, Its actual subtype will be obtained
3232 -- from the aggregate, and not from the default discriminants.
3237 Rewrite (Object_Definition (N), New_Occurrence_Of (Act_T, Loc));
3239 elsif Present (Underlying_Type (T))
3240 and then not Is_Constrained (Underlying_Type (T))
3241 and then Has_Discriminants (Underlying_Type (T))
3242 and then Nkind (E) = N_Function_Call
3243 and then Constant_Present (N)
3245 -- The back-end has problems with constants of a discriminated type
3246 -- with defaults, if the initial value is a function call. We
3247 -- generate an intermediate temporary for the result of the call.
3248 -- It is unclear why this should make it acceptable to gcc. ???
3250 Remove_Side_Effects (E);
3253 -- Check No_Wide_Characters restriction
3255 Check_Wide_Character_Restriction (T, Object_Definition (N));
3257 -- Indicate this is not set in source. Certainly true for constants,
3258 -- and true for variables so far (will be reset for a variable if and
3259 -- when we encounter a modification in the source).
3261 Set_Never_Set_In_Source (Id, True);
3263 -- Now establish the proper kind and type of the object
3265 if Constant_Present (N) then
3266 Set_Ekind (Id, E_Constant);
3267 Set_Is_True_Constant (Id, True);
3270 Set_Ekind (Id, E_Variable);
3272 -- A variable is set as shared passive if it appears in a shared
3273 -- passive package, and is at the outer level. This is not done
3274 -- for entities generated during expansion, because those are
3275 -- always manipulated locally.
3277 if Is_Shared_Passive (Current_Scope)
3278 and then Is_Library_Level_Entity (Id)
3279 and then Comes_From_Source (Id)
3281 Set_Is_Shared_Passive (Id);
3282 Check_Shared_Var (Id, T, N);
3285 -- Set Has_Initial_Value if initializing expression present. Note
3286 -- that if there is no initializing expression, we leave the state
3287 -- of this flag unchanged (usually it will be False, but notably in
3288 -- the case of exception choice variables, it will already be true).
3291 Set_Has_Initial_Value (Id, True);
3295 -- Initialize alignment and size and capture alignment setting
3297 Init_Alignment (Id);
3299 Set_Optimize_Alignment_Flags (Id);
3301 -- Deal with aliased case
3303 if Aliased_Present (N) then
3304 Set_Is_Aliased (Id);
3306 -- If the object is aliased and the type is unconstrained with
3307 -- defaulted discriminants and there is no expression, then the
3308 -- object is constrained by the defaults, so it is worthwhile
3309 -- building the corresponding subtype.
3311 -- Ada 2005 (AI-363): If the aliased object is discriminated and
3312 -- unconstrained, then only establish an actual subtype if the
3313 -- nominal subtype is indefinite. In definite cases the object is
3314 -- unconstrained in Ada 2005.
3317 and then Is_Record_Type (T)
3318 and then not Is_Constrained (T)
3319 and then Has_Discriminants (T)
3320 and then (Ada_Version < Ada_2005 or else Is_Indefinite_Subtype (T))
3322 Set_Actual_Subtype (Id, Build_Default_Subtype (T, N));
3326 -- Now we can set the type of the object
3328 Set_Etype (Id, Act_T);
3330 -- Deal with controlled types
3332 if Has_Controlled_Component (Etype (Id))
3333 or else Is_Controlled (Etype (Id))
3335 if not Is_Library_Level_Entity (Id) then
3336 Check_Restriction (No_Nested_Finalization, N);
3338 Validate_Controlled_Object (Id);
3341 -- Generate a warning when an initialization causes an obvious ABE
3342 -- violation. If the init expression is a simple aggregate there
3343 -- shouldn't be any initialize/adjust call generated. This will be
3344 -- true as soon as aggregates are built in place when possible.
3346 -- ??? at the moment we do not generate warnings for temporaries
3347 -- created for those aggregates although Program_Error might be
3348 -- generated if compiled with -gnato.
3350 if Is_Controlled (Etype (Id))
3351 and then Comes_From_Source (Id)
3354 BT : constant Entity_Id := Base_Type (Etype (Id));
3356 Implicit_Call : Entity_Id;
3357 pragma Warnings (Off, Implicit_Call);
3358 -- ??? what is this for (never referenced!)
3360 function Is_Aggr (N : Node_Id) return Boolean;
3361 -- Check that N is an aggregate
3367 function Is_Aggr (N : Node_Id) return Boolean is
3369 case Nkind (Original_Node (N)) is
3370 when N_Aggregate | N_Extension_Aggregate =>
3373 when N_Qualified_Expression |
3375 N_Unchecked_Type_Conversion =>
3376 return Is_Aggr (Expression (Original_Node (N)));
3384 -- If no underlying type, we already are in an error situation.
3385 -- Do not try to add a warning since we do not have access to
3388 if No (Underlying_Type (BT)) then
3389 Implicit_Call := Empty;
3391 -- A generic type does not have usable primitive operators.
3392 -- Initialization calls are built for instances.
3394 elsif Is_Generic_Type (BT) then
3395 Implicit_Call := Empty;
3397 -- If the init expression is not an aggregate, an adjust call
3398 -- will be generated
3400 elsif Present (E) and then not Is_Aggr (E) then
3401 Implicit_Call := Find_Prim_Op (BT, Name_Adjust);
3403 -- If no init expression and we are not in the deferred
3404 -- constant case, an Initialize call will be generated
3406 elsif No (E) and then not Constant_Present (N) then
3407 Implicit_Call := Find_Prim_Op (BT, Name_Initialize);
3410 Implicit_Call := Empty;
3416 if Has_Task (Etype (Id)) then
3417 Check_Restriction (No_Tasking, N);
3419 -- Deal with counting max tasks
3421 -- Nothing to do if inside a generic
3423 if Inside_A_Generic then
3426 -- If library level entity, then count tasks
3428 elsif Is_Library_Level_Entity (Id) then
3429 Check_Restriction (Max_Tasks, N, Count_Tasks (Etype (Id)));
3431 -- If not library level entity, then indicate we don't know max
3432 -- tasks and also check task hierarchy restriction and blocking
3433 -- operation (since starting a task is definitely blocking!)
3436 Check_Restriction (Max_Tasks, N);
3437 Check_Restriction (No_Task_Hierarchy, N);
3438 Check_Potentially_Blocking_Operation (N);
3441 -- A rather specialized test. If we see two tasks being declared
3442 -- of the same type in the same object declaration, and the task
3443 -- has an entry with an address clause, we know that program error
3444 -- will be raised at run time since we can't have two tasks with
3445 -- entries at the same address.
3447 if Is_Task_Type (Etype (Id)) and then More_Ids (N) then
3452 E := First_Entity (Etype (Id));
3453 while Present (E) loop
3454 if Ekind (E) = E_Entry
3455 and then Present (Get_Attribute_Definition_Clause
3456 (E, Attribute_Address))
3459 ("?more than one task with same entry address", N);
3461 ("\?Program_Error will be raised at run time", N);
3463 Make_Raise_Program_Error (Loc,
3464 Reason => PE_Duplicated_Entry_Address));
3474 -- Some simple constant-propagation: if the expression is a constant
3475 -- string initialized with a literal, share the literal. This avoids
3479 and then Is_Entity_Name (E)
3480 and then Ekind (Entity (E)) = E_Constant
3481 and then Base_Type (Etype (E)) = Standard_String
3484 Val : constant Node_Id := Constant_Value (Entity (E));
3487 and then Nkind (Val) = N_String_Literal
3489 Rewrite (E, New_Copy (Val));
3494 -- Another optimization: if the nominal subtype is unconstrained and
3495 -- the expression is a function call that returns an unconstrained
3496 -- type, rewrite the declaration as a renaming of the result of the
3497 -- call. The exceptions below are cases where the copy is expected,
3498 -- either by the back end (Aliased case) or by the semantics, as for
3499 -- initializing controlled types or copying tags for classwide types.
3502 and then Nkind (E) = N_Explicit_Dereference
3503 and then Nkind (Original_Node (E)) = N_Function_Call
3504 and then not Is_Library_Level_Entity (Id)
3505 and then not Is_Constrained (Underlying_Type (T))
3506 and then not Is_Aliased (Id)
3507 and then not Is_Class_Wide_Type (T)
3508 and then not Is_Controlled (T)
3509 and then not Has_Controlled_Component (Base_Type (T))
3510 and then Expander_Active
3513 Make_Object_Renaming_Declaration (Loc,
3514 Defining_Identifier => Id,
3515 Access_Definition => Empty,
3516 Subtype_Mark => New_Occurrence_Of
3517 (Base_Type (Etype (Id)), Loc),
3520 Set_Renamed_Object (Id, E);
3522 -- Force generation of debugging information for the constant and for
3523 -- the renamed function call.
3525 Set_Debug_Info_Needed (Id);
3526 Set_Debug_Info_Needed (Entity (Prefix (E)));
3529 if Present (Prev_Entity)
3530 and then Is_Frozen (Prev_Entity)
3531 and then not Error_Posted (Id)
3533 Error_Msg_N ("full constant declaration appears too late", N);
3536 Check_Eliminated (Id);
3538 -- Deal with setting In_Private_Part flag if in private part
3540 if Ekind (Scope (Id)) = E_Package
3541 and then In_Private_Part (Scope (Id))
3543 Set_In_Private_Part (Id);
3546 -- Check for violation of No_Local_Timing_Events
3548 if Is_RTE (Etype (Id), RE_Timing_Event)
3549 and then not Is_Library_Level_Entity (Id)
3551 Check_Restriction (No_Local_Timing_Events, N);
3555 Analyze_Aspect_Specifications (N, Id, Aspect_Specifications (N));
3556 end Analyze_Object_Declaration;
3558 ---------------------------
3559 -- Analyze_Others_Choice --
3560 ---------------------------
3562 -- Nothing to do for the others choice node itself, the semantic analysis
3563 -- of the others choice will occur as part of the processing of the parent
3565 procedure Analyze_Others_Choice (N : Node_Id) is
3566 pragma Warnings (Off, N);
3569 end Analyze_Others_Choice;
3571 -------------------------------------------
3572 -- Analyze_Private_Extension_Declaration --
3573 -------------------------------------------
3575 procedure Analyze_Private_Extension_Declaration (N : Node_Id) is
3576 T : constant Entity_Id := Defining_Identifier (N);
3577 Indic : constant Node_Id := Subtype_Indication (N);
3578 Parent_Type : Entity_Id;
3579 Parent_Base : Entity_Id;
3582 -- Ada 2005 (AI-251): Decorate all names in list of ancestor interfaces
3584 if Is_Non_Empty_List (Interface_List (N)) then
3590 Intf := First (Interface_List (N));
3591 while Present (Intf) loop
3592 T := Find_Type_Of_Subtype_Indic (Intf);
3594 Diagnose_Interface (Intf, T);
3600 Generate_Definition (T);
3602 -- For other than Ada 2012, just enter the name in the current scope
3604 if Ada_Version < Ada_2012 then
3607 -- Ada 2012 (AI05-0162): Enter the name in the current scope handling
3608 -- case of private type that completes an incomplete type.
3615 Prev := Find_Type_Name (N);
3617 pragma Assert (Prev = T
3618 or else (Ekind (Prev) = E_Incomplete_Type
3619 and then Present (Full_View (Prev))
3620 and then Full_View (Prev) = T));
3624 Parent_Type := Find_Type_Of_Subtype_Indic (Indic);
3625 Parent_Base := Base_Type (Parent_Type);
3627 if Parent_Type = Any_Type
3628 or else Etype (Parent_Type) = Any_Type
3630 Set_Ekind (T, Ekind (Parent_Type));
3631 Set_Etype (T, Any_Type);
3634 elsif not Is_Tagged_Type (Parent_Type) then
3636 ("parent of type extension must be a tagged type ", Indic);
3639 elsif Ekind_In (Parent_Type, E_Void, E_Incomplete_Type) then
3640 Error_Msg_N ("premature derivation of incomplete type", Indic);
3643 elsif Is_Concurrent_Type (Parent_Type) then
3645 ("parent type of a private extension cannot be "
3646 & "a synchronized tagged type (RM 3.9.1 (3/1))", N);
3648 Set_Etype (T, Any_Type);
3649 Set_Ekind (T, E_Limited_Private_Type);
3650 Set_Private_Dependents (T, New_Elmt_List);
3651 Set_Error_Posted (T);
3655 -- Perhaps the parent type should be changed to the class-wide type's
3656 -- specific type in this case to prevent cascading errors ???
3658 if Is_Class_Wide_Type (Parent_Type) then
3660 ("parent of type extension must not be a class-wide type", Indic);
3664 if (not Is_Package_Or_Generic_Package (Current_Scope)
3665 and then Nkind (Parent (N)) /= N_Generic_Subprogram_Declaration)
3666 or else In_Private_Part (Current_Scope)
3669 Error_Msg_N ("invalid context for private extension", N);
3672 -- Set common attributes
3674 Set_Is_Pure (T, Is_Pure (Current_Scope));
3675 Set_Scope (T, Current_Scope);
3676 Set_Ekind (T, E_Record_Type_With_Private);
3677 Init_Size_Align (T);
3679 Set_Etype (T, Parent_Base);
3680 Set_Has_Task (T, Has_Task (Parent_Base));
3682 Set_Convention (T, Convention (Parent_Type));
3683 Set_First_Rep_Item (T, First_Rep_Item (Parent_Type));
3684 Set_Is_First_Subtype (T);
3685 Make_Class_Wide_Type (T);
3687 if Unknown_Discriminants_Present (N) then
3688 Set_Discriminant_Constraint (T, No_Elist);
3691 Build_Derived_Record_Type (N, Parent_Type, T);
3693 -- Ada 2005 (AI-443): Synchronized private extension or a rewritten
3694 -- synchronized formal derived type.
3696 if Ada_Version >= Ada_2005
3697 and then Synchronized_Present (N)
3699 Set_Is_Limited_Record (T);
3701 -- Formal derived type case
3703 if Is_Generic_Type (T) then
3705 -- The parent must be a tagged limited type or a synchronized
3708 if (not Is_Tagged_Type (Parent_Type)
3709 or else not Is_Limited_Type (Parent_Type))
3711 (not Is_Interface (Parent_Type)
3712 or else not Is_Synchronized_Interface (Parent_Type))
3714 Error_Msg_NE ("parent type of & must be tagged limited " &
3715 "or synchronized", N, T);
3718 -- The progenitors (if any) must be limited or synchronized
3721 if Present (Interfaces (T)) then
3724 Iface_Elmt : Elmt_Id;
3727 Iface_Elmt := First_Elmt (Interfaces (T));
3728 while Present (Iface_Elmt) loop
3729 Iface := Node (Iface_Elmt);
3731 if not Is_Limited_Interface (Iface)
3732 and then not Is_Synchronized_Interface (Iface)
3734 Error_Msg_NE ("progenitor & must be limited " &
3735 "or synchronized", N, Iface);
3738 Next_Elmt (Iface_Elmt);
3743 -- Regular derived extension, the parent must be a limited or
3744 -- synchronized interface.
3747 if not Is_Interface (Parent_Type)
3748 or else (not Is_Limited_Interface (Parent_Type)
3750 not Is_Synchronized_Interface (Parent_Type))
3753 ("parent type of & must be limited interface", N, T);
3757 -- A consequence of 3.9.4 (6/2) and 7.3 (7.2/2) is that a private
3758 -- extension with a synchronized parent must be explicitly declared
3759 -- synchronized, because the full view will be a synchronized type.
3760 -- This must be checked before the check for limited types below,
3761 -- to ensure that types declared limited are not allowed to extend
3762 -- synchronized interfaces.
3764 elsif Is_Interface (Parent_Type)
3765 and then Is_Synchronized_Interface (Parent_Type)
3766 and then not Synchronized_Present (N)
3769 ("private extension of& must be explicitly synchronized",
3772 elsif Limited_Present (N) then
3773 Set_Is_Limited_Record (T);
3775 if not Is_Limited_Type (Parent_Type)
3777 (not Is_Interface (Parent_Type)
3778 or else not Is_Limited_Interface (Parent_Type))
3780 Error_Msg_NE ("parent type& of limited extension must be limited",
3786 Analyze_Aspect_Specifications (N, T, Aspect_Specifications (N));
3787 end Analyze_Private_Extension_Declaration;
3789 ---------------------------------
3790 -- Analyze_Subtype_Declaration --
3791 ---------------------------------
3793 procedure Analyze_Subtype_Declaration
3795 Skip : Boolean := False)
3797 Id : constant Entity_Id := Defining_Identifier (N);
3799 R_Checks : Check_Result;
3802 Generate_Definition (Id);
3803 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3804 Init_Size_Align (Id);
3806 -- The following guard condition on Enter_Name is to handle cases where
3807 -- the defining identifier has already been entered into the scope but
3808 -- the declaration as a whole needs to be analyzed.
3810 -- This case in particular happens for derived enumeration types. The
3811 -- derived enumeration type is processed as an inserted enumeration type
3812 -- declaration followed by a rewritten subtype declaration. The defining
3813 -- identifier, however, is entered into the name scope very early in the
3814 -- processing of the original type declaration and therefore needs to be
3815 -- avoided here, when the created subtype declaration is analyzed. (See
3816 -- Build_Derived_Types)
3818 -- This also happens when the full view of a private type is derived
3819 -- type with constraints. In this case the entity has been introduced
3820 -- in the private declaration.
3823 or else (Present (Etype (Id))
3824 and then (Is_Private_Type (Etype (Id))
3825 or else Is_Task_Type (Etype (Id))
3826 or else Is_Rewrite_Substitution (N)))
3834 T := Process_Subtype (Subtype_Indication (N), N, Id, 'P');
3836 -- Inherit common attributes
3838 Set_Is_Generic_Type (Id, Is_Generic_Type (Base_Type (T)));
3839 Set_Is_Volatile (Id, Is_Volatile (T));
3840 Set_Treat_As_Volatile (Id, Treat_As_Volatile (T));
3841 Set_Is_Atomic (Id, Is_Atomic (T));
3842 Set_Is_Ada_2005_Only (Id, Is_Ada_2005_Only (T));
3843 Set_Is_Ada_2012_Only (Id, Is_Ada_2012_Only (T));
3844 Set_Convention (Id, Convention (T));
3845 Set_Has_Predicates (Id, Has_Predicates (T));
3847 -- In the case where there is no constraint given in the subtype
3848 -- indication, Process_Subtype just returns the Subtype_Mark, so its
3849 -- semantic attributes must be established here.
3851 if Nkind (Subtype_Indication (N)) /= N_Subtype_Indication then
3852 Set_Etype (Id, Base_Type (T));
3856 Set_Ekind (Id, E_Array_Subtype);
3857 Copy_Array_Subtype_Attributes (Id, T);
3859 when Decimal_Fixed_Point_Kind =>
3860 Set_Ekind (Id, E_Decimal_Fixed_Point_Subtype);
3861 Set_Digits_Value (Id, Digits_Value (T));
3862 Set_Delta_Value (Id, Delta_Value (T));
3863 Set_Scale_Value (Id, Scale_Value (T));
3864 Set_Small_Value (Id, Small_Value (T));
3865 Set_Scalar_Range (Id, Scalar_Range (T));
3866 Set_Machine_Radix_10 (Id, Machine_Radix_10 (T));
3867 Set_Is_Constrained (Id, Is_Constrained (T));
3868 Set_Is_Known_Valid (Id, Is_Known_Valid (T));
3869 Set_RM_Size (Id, RM_Size (T));
3871 when Enumeration_Kind =>
3872 Set_Ekind (Id, E_Enumeration_Subtype);
3873 Set_First_Literal (Id, First_Literal (Base_Type (T)));
3874 Set_Scalar_Range (Id, Scalar_Range (T));
3875 Set_Is_Character_Type (Id, Is_Character_Type (T));
3876 Set_Is_Constrained (Id, Is_Constrained (T));
3877 Set_Is_Known_Valid (Id, Is_Known_Valid (T));
3878 Set_RM_Size (Id, RM_Size (T));
3880 when Ordinary_Fixed_Point_Kind =>
3881 Set_Ekind (Id, E_Ordinary_Fixed_Point_Subtype);
3882 Set_Scalar_Range (Id, Scalar_Range (T));
3883 Set_Small_Value (Id, Small_Value (T));
3884 Set_Delta_Value (Id, Delta_Value (T));
3885 Set_Is_Constrained (Id, Is_Constrained (T));
3886 Set_Is_Known_Valid (Id, Is_Known_Valid (T));
3887 Set_RM_Size (Id, RM_Size (T));
3890 Set_Ekind (Id, E_Floating_Point_Subtype);
3891 Set_Scalar_Range (Id, Scalar_Range (T));
3892 Set_Digits_Value (Id, Digits_Value (T));
3893 Set_Is_Constrained (Id, Is_Constrained (T));
3895 when Signed_Integer_Kind =>
3896 Set_Ekind (Id, E_Signed_Integer_Subtype);
3897 Set_Scalar_Range (Id, Scalar_Range (T));
3898 Set_Is_Constrained (Id, Is_Constrained (T));
3899 Set_Is_Known_Valid (Id, Is_Known_Valid (T));
3900 Set_RM_Size (Id, RM_Size (T));
3902 when Modular_Integer_Kind =>
3903 Set_Ekind (Id, E_Modular_Integer_Subtype);
3904 Set_Scalar_Range (Id, Scalar_Range (T));
3905 Set_Is_Constrained (Id, Is_Constrained (T));
3906 Set_Is_Known_Valid (Id, Is_Known_Valid (T));
3907 Set_RM_Size (Id, RM_Size (T));
3909 when Class_Wide_Kind =>
3910 Set_Ekind (Id, E_Class_Wide_Subtype);
3911 Set_First_Entity (Id, First_Entity (T));
3912 Set_Last_Entity (Id, Last_Entity (T));
3913 Set_Class_Wide_Type (Id, Class_Wide_Type (T));
3914 Set_Cloned_Subtype (Id, T);
3915 Set_Is_Tagged_Type (Id, True);
3916 Set_Has_Unknown_Discriminants
3919 if Ekind (T) = E_Class_Wide_Subtype then
3920 Set_Equivalent_Type (Id, Equivalent_Type (T));
3923 when E_Record_Type | E_Record_Subtype =>
3924 Set_Ekind (Id, E_Record_Subtype);
3926 if Ekind (T) = E_Record_Subtype
3927 and then Present (Cloned_Subtype (T))
3929 Set_Cloned_Subtype (Id, Cloned_Subtype (T));
3931 Set_Cloned_Subtype (Id, T);
3934 Set_First_Entity (Id, First_Entity (T));
3935 Set_Last_Entity (Id, Last_Entity (T));
3936 Set_Has_Discriminants (Id, Has_Discriminants (T));
3937 Set_Is_Constrained (Id, Is_Constrained (T));
3938 Set_Is_Limited_Record (Id, Is_Limited_Record (T));
3939 Set_Has_Unknown_Discriminants
3940 (Id, Has_Unknown_Discriminants (T));
3942 if Has_Discriminants (T) then
3943 Set_Discriminant_Constraint
3944 (Id, Discriminant_Constraint (T));
3945 Set_Stored_Constraint_From_Discriminant_Constraint (Id);
3947 elsif Has_Unknown_Discriminants (Id) then
3948 Set_Discriminant_Constraint (Id, No_Elist);
3951 if Is_Tagged_Type (T) then
3952 Set_Is_Tagged_Type (Id);
3953 Set_Is_Abstract_Type (Id, Is_Abstract_Type (T));
3954 Set_Direct_Primitive_Operations
3955 (Id, Direct_Primitive_Operations (T));
3956 Set_Class_Wide_Type (Id, Class_Wide_Type (T));
3958 if Is_Interface (T) then
3959 Set_Is_Interface (Id);
3960 Set_Is_Limited_Interface (Id, Is_Limited_Interface (T));
3964 when Private_Kind =>
3965 Set_Ekind (Id, Subtype_Kind (Ekind (T)));
3966 Set_Has_Discriminants (Id, Has_Discriminants (T));
3967 Set_Is_Constrained (Id, Is_Constrained (T));
3968 Set_First_Entity (Id, First_Entity (T));
3969 Set_Last_Entity (Id, Last_Entity (T));
3970 Set_Private_Dependents (Id, New_Elmt_List);
3971 Set_Is_Limited_Record (Id, Is_Limited_Record (T));
3972 Set_Has_Unknown_Discriminants
3973 (Id, Has_Unknown_Discriminants (T));
3974 Set_Known_To_Have_Preelab_Init
3975 (Id, Known_To_Have_Preelab_Init (T));
3977 if Is_Tagged_Type (T) then
3978 Set_Is_Tagged_Type (Id);
3979 Set_Is_Abstract_Type (Id, Is_Abstract_Type (T));
3980 Set_Class_Wide_Type (Id, Class_Wide_Type (T));
3981 Set_Direct_Primitive_Operations (Id,
3982 Direct_Primitive_Operations (T));
3985 -- In general the attributes of the subtype of a private type
3986 -- are the attributes of the partial view of parent. However,
3987 -- the full view may be a discriminated type, and the subtype
3988 -- must share the discriminant constraint to generate correct
3989 -- calls to initialization procedures.
3991 if Has_Discriminants (T) then
3992 Set_Discriminant_Constraint
3993 (Id, Discriminant_Constraint (T));
3994 Set_Stored_Constraint_From_Discriminant_Constraint (Id);
3996 elsif Present (Full_View (T))
3997 and then Has_Discriminants (Full_View (T))
3999 Set_Discriminant_Constraint
4000 (Id, Discriminant_Constraint (Full_View (T)));
4001 Set_Stored_Constraint_From_Discriminant_Constraint (Id);
4003 -- This would seem semantically correct, but apparently
4004 -- confuses the back-end. To be explained and checked with
4005 -- current version ???
4007 -- Set_Has_Discriminants (Id);
4010 Prepare_Private_Subtype_Completion (Id, N);
4013 Set_Ekind (Id, E_Access_Subtype);
4014 Set_Is_Constrained (Id, Is_Constrained (T));
4015 Set_Is_Access_Constant
4016 (Id, Is_Access_Constant (T));
4017 Set_Directly_Designated_Type
4018 (Id, Designated_Type (T));
4019 Set_Can_Never_Be_Null (Id, Can_Never_Be_Null (T));
4021 -- A Pure library_item must not contain the declaration of a
4022 -- named access type, except within a subprogram, generic
4023 -- subprogram, task unit, or protected unit, or if it has
4024 -- a specified Storage_Size of zero (RM05-10.2.1(15.4-15.5)).
4026 if Comes_From_Source (Id)
4027 and then In_Pure_Unit
4028 and then not In_Subprogram_Task_Protected_Unit
4029 and then not No_Pool_Assigned (Id)
4032 ("named access types not allowed in pure unit", N);
4035 when Concurrent_Kind =>
4036 Set_Ekind (Id, Subtype_Kind (Ekind (T)));
4037 Set_Corresponding_Record_Type (Id,
4038 Corresponding_Record_Type (T));
4039 Set_First_Entity (Id, First_Entity (T));
4040 Set_First_Private_Entity (Id, First_Private_Entity (T));
4041 Set_Has_Discriminants (Id, Has_Discriminants (T));
4042 Set_Is_Constrained (Id, Is_Constrained (T));
4043 Set_Is_Tagged_Type (Id, Is_Tagged_Type (T));
4044 Set_Last_Entity (Id, Last_Entity (T));
4046 if Has_Discriminants (T) then
4047 Set_Discriminant_Constraint (Id,
4048 Discriminant_Constraint (T));
4049 Set_Stored_Constraint_From_Discriminant_Constraint (Id);
4052 when E_Incomplete_Type =>
4053 if Ada_Version >= Ada_2005 then
4054 Set_Ekind (Id, E_Incomplete_Subtype);
4056 -- Ada 2005 (AI-412): Decorate an incomplete subtype
4057 -- of an incomplete type visible through a limited
4060 if From_With_Type (T)
4061 and then Present (Non_Limited_View (T))
4063 Set_From_With_Type (Id);
4064 Set_Non_Limited_View (Id, Non_Limited_View (T));
4066 -- Ada 2005 (AI-412): Add the regular incomplete subtype
4067 -- to the private dependents of the original incomplete
4068 -- type for future transformation.
4071 Append_Elmt (Id, Private_Dependents (T));
4074 -- If the subtype name denotes an incomplete type an error
4075 -- was already reported by Process_Subtype.
4078 Set_Etype (Id, Any_Type);
4082 raise Program_Error;
4086 if Etype (Id) = Any_Type then
4090 -- Some common processing on all types
4092 Set_Size_Info (Id, T);
4093 Set_First_Rep_Item (Id, First_Rep_Item (T));
4097 Set_Is_Immediately_Visible (Id, True);
4098 Set_Depends_On_Private (Id, Has_Private_Component (T));
4099 Set_Is_Descendent_Of_Address (Id, Is_Descendent_Of_Address (T));
4101 if Is_Interface (T) then
4102 Set_Is_Interface (Id);
4105 if Present (Generic_Parent_Type (N))
4108 (Parent (Generic_Parent_Type (N))) /= N_Formal_Type_Declaration
4110 (Formal_Type_Definition (Parent (Generic_Parent_Type (N))))
4111 /= N_Formal_Private_Type_Definition)
4113 if Is_Tagged_Type (Id) then
4115 -- If this is a generic actual subtype for a synchronized type,
4116 -- the primitive operations are those of the corresponding record
4117 -- for which there is a separate subtype declaration.
4119 if Is_Concurrent_Type (Id) then
4121 elsif Is_Class_Wide_Type (Id) then
4122 Derive_Subprograms (Generic_Parent_Type (N), Id, Etype (T));
4124 Derive_Subprograms (Generic_Parent_Type (N), Id, T);
4127 elsif Scope (Etype (Id)) /= Standard_Standard then
4128 Derive_Subprograms (Generic_Parent_Type (N), Id);
4132 if Is_Private_Type (T)
4133 and then Present (Full_View (T))
4135 Conditional_Delay (Id, Full_View (T));
4137 -- The subtypes of components or subcomponents of protected types
4138 -- do not need freeze nodes, which would otherwise appear in the
4139 -- wrong scope (before the freeze node for the protected type). The
4140 -- proper subtypes are those of the subcomponents of the corresponding
4143 elsif Ekind (Scope (Id)) /= E_Protected_Type
4144 and then Present (Scope (Scope (Id))) -- error defense!
4145 and then Ekind (Scope (Scope (Id))) /= E_Protected_Type
4147 Conditional_Delay (Id, T);
4150 -- Check that constraint_error is raised for a scalar subtype
4151 -- indication when the lower or upper bound of a non-null range
4152 -- lies outside the range of the type mark.
4154 if Nkind (Subtype_Indication (N)) = N_Subtype_Indication then
4155 if Is_Scalar_Type (Etype (Id))
4156 and then Scalar_Range (Id) /=
4157 Scalar_Range (Etype (Subtype_Mark
4158 (Subtype_Indication (N))))
4162 Etype (Subtype_Mark (Subtype_Indication (N))));
4164 elsif Is_Array_Type (Etype (Id))
4165 and then Present (First_Index (Id))
4167 -- This really should be a subprogram that finds the indications
4170 if ((Nkind (First_Index (Id)) = N_Identifier
4171 and then Ekind (Entity (First_Index (Id))) in Scalar_Kind)
4172 or else Nkind (First_Index (Id)) = N_Subtype_Indication)
4174 Nkind (Scalar_Range (Etype (First_Index (Id)))) = N_Range
4177 Target_Typ : constant Entity_Id :=
4180 (Subtype_Mark (Subtype_Indication (N)))));
4184 (Scalar_Range (Etype (First_Index (Id))),
4186 Etype (First_Index (Id)),
4187 Defining_Identifier (N));
4193 Sloc (Defining_Identifier (N)));
4199 -- Make sure that generic actual types are properly frozen. The subtype
4200 -- is marked as a generic actual type when the enclosing instance is
4201 -- analyzed, so here we identify the subtype from the tree structure.
4204 and then Is_Generic_Actual_Type (Id)
4205 and then In_Instance
4206 and then not Comes_From_Source (N)
4207 and then Nkind (Subtype_Indication (N)) /= N_Subtype_Indication
4208 and then Is_Frozen (T)
4210 Freeze_Before (N, Id);
4213 Set_Optimize_Alignment_Flags (Id);
4214 Check_Eliminated (Id);
4217 Analyze_Aspect_Specifications (N, Id, Aspect_Specifications (N));
4218 end Analyze_Subtype_Declaration;
4220 --------------------------------
4221 -- Analyze_Subtype_Indication --
4222 --------------------------------
4224 procedure Analyze_Subtype_Indication (N : Node_Id) is
4225 T : constant Entity_Id := Subtype_Mark (N);
4226 R : constant Node_Id := Range_Expression (Constraint (N));
4233 Set_Etype (N, Etype (R));
4234 Resolve (R, Entity (T));
4236 Set_Error_Posted (R);
4237 Set_Error_Posted (T);
4239 end Analyze_Subtype_Indication;
4241 --------------------------
4242 -- Analyze_Variant_Part --
4243 --------------------------
4245 procedure Analyze_Variant_Part (N : Node_Id) is
4247 procedure Non_Static_Choice_Error (Choice : Node_Id);
4248 -- Error routine invoked by the generic instantiation below when the
4249 -- variant part has a non static choice.
4251 procedure Process_Declarations (Variant : Node_Id);
4252 -- Analyzes all the declarations associated with a Variant. Needed by
4253 -- the generic instantiation below.
4255 package Variant_Choices_Processing is new
4256 Generic_Choices_Processing
4257 (Get_Alternatives => Variants,
4258 Get_Choices => Discrete_Choices,
4259 Process_Empty_Choice => No_OP,
4260 Process_Non_Static_Choice => Non_Static_Choice_Error,
4261 Process_Associated_Node => Process_Declarations);
4262 use Variant_Choices_Processing;
4263 -- Instantiation of the generic choice processing package
4265 -----------------------------
4266 -- Non_Static_Choice_Error --
4267 -----------------------------
4269 procedure Non_Static_Choice_Error (Choice : Node_Id) is
4271 Flag_Non_Static_Expr
4272 ("choice given in variant part is not static!", Choice);
4273 end Non_Static_Choice_Error;
4275 --------------------------
4276 -- Process_Declarations --
4277 --------------------------
4279 procedure Process_Declarations (Variant : Node_Id) is
4281 if not Null_Present (Component_List (Variant)) then
4282 Analyze_Declarations (Component_Items (Component_List (Variant)));
4284 if Present (Variant_Part (Component_List (Variant))) then
4285 Analyze (Variant_Part (Component_List (Variant)));
4288 end Process_Declarations;
4292 Discr_Name : Node_Id;
4293 Discr_Type : Entity_Id;
4295 Case_Table : Choice_Table_Type (1 .. Number_Of_Choices (N));
4297 Dont_Care : Boolean;
4298 Others_Present : Boolean := False;
4300 pragma Warnings (Off, Case_Table);
4301 pragma Warnings (Off, Last_Choice);
4302 pragma Warnings (Off, Dont_Care);
4303 pragma Warnings (Off, Others_Present);
4304 -- We don't care about the assigned values of any of these
4306 -- Start of processing for Analyze_Variant_Part
4309 Discr_Name := Name (N);
4310 Analyze (Discr_Name);
4312 -- If Discr_Name bad, get out (prevent cascaded errors)
4314 if Etype (Discr_Name) = Any_Type then
4318 -- Check invalid discriminant in variant part
4320 if Ekind (Entity (Discr_Name)) /= E_Discriminant then
4321 Error_Msg_N ("invalid discriminant name in variant part", Discr_Name);
4324 Discr_Type := Etype (Entity (Discr_Name));
4326 if not Is_Discrete_Type (Discr_Type) then
4328 ("discriminant in a variant part must be of a discrete type",
4333 -- Call the instantiated Analyze_Choices which does the rest of the work
4336 (N, Discr_Type, Case_Table, Last_Choice, Dont_Care, Others_Present);
4337 end Analyze_Variant_Part;
4339 ----------------------------
4340 -- Array_Type_Declaration --
4341 ----------------------------
4343 procedure Array_Type_Declaration (T : in out Entity_Id; Def : Node_Id) is
4344 Component_Def : constant Node_Id := Component_Definition (Def);
4345 Element_Type : Entity_Id;
4346 Implicit_Base : Entity_Id;
4348 Related_Id : Entity_Id := Empty;
4350 P : constant Node_Id := Parent (Def);
4354 if Nkind (Def) = N_Constrained_Array_Definition then
4355 Index := First (Discrete_Subtype_Definitions (Def));
4357 Index := First (Subtype_Marks (Def));
4360 -- Find proper names for the implicit types which may be public. In case
4361 -- of anonymous arrays we use the name of the first object of that type
4365 Related_Id := Defining_Identifier (P);
4371 while Present (Index) loop
4374 -- Add a subtype declaration for each index of private array type
4375 -- declaration whose etype is also private. For example:
4378 -- type Index is private;
4380 -- type Table is array (Index) of ...
4383 -- This is currently required by the expander for the internally
4384 -- generated equality subprogram of records with variant parts in
4385 -- which the etype of some component is such private type.
4387 if Ekind (Current_Scope) = E_Package
4388 and then In_Private_Part (Current_Scope)
4389 and then Has_Private_Declaration (Etype (Index))
4392 Loc : constant Source_Ptr := Sloc (Def);
4397 New_E := Make_Temporary (Loc, 'T');
4398 Set_Is_Internal (New_E);
4401 Make_Subtype_Declaration (Loc,
4402 Defining_Identifier => New_E,
4403 Subtype_Indication =>
4404 New_Occurrence_Of (Etype (Index), Loc));
4406 Insert_Before (Parent (Def), Decl);
4408 Set_Etype (Index, New_E);
4410 -- If the index is a range the Entity attribute is not
4411 -- available. Example:
4414 -- type T is private;
4416 -- type T is new Natural;
4417 -- Table : array (T(1) .. T(10)) of Boolean;
4420 if Nkind (Index) /= N_Range then
4421 Set_Entity (Index, New_E);
4426 Make_Index (Index, P, Related_Id, Nb_Index);
4428 -- Check error of subtype with predicate for index type
4430 if Has_Predicates (Etype (Index)) then
4432 ("subtype& has predicate, not allowed as index subtype",
4433 Index, Etype (Index));
4436 -- Move to next index
4439 Nb_Index := Nb_Index + 1;
4442 -- Process subtype indication if one is present
4444 if Present (Subtype_Indication (Component_Def)) then
4447 (Subtype_Indication (Component_Def), P, Related_Id, 'C');
4449 -- Ada 2005 (AI-230): Access Definition case
4451 else pragma Assert (Present (Access_Definition (Component_Def)));
4453 -- Indicate that the anonymous access type is created by the
4454 -- array type declaration.
4456 Element_Type := Access_Definition
4458 N => Access_Definition (Component_Def));
4459 Set_Is_Local_Anonymous_Access (Element_Type);
4461 -- Propagate the parent. This field is needed if we have to generate
4462 -- the master_id associated with an anonymous access to task type
4463 -- component (see Expand_N_Full_Type_Declaration.Build_Master)
4465 Set_Parent (Element_Type, Parent (T));
4467 -- Ada 2005 (AI-230): In case of components that are anonymous access
4468 -- types the level of accessibility depends on the enclosing type
4471 Set_Scope (Element_Type, Current_Scope); -- Ada 2005 (AI-230)
4473 -- Ada 2005 (AI-254)
4476 CD : constant Node_Id :=
4477 Access_To_Subprogram_Definition
4478 (Access_Definition (Component_Def));
4480 if Present (CD) and then Protected_Present (CD) then
4482 Replace_Anonymous_Access_To_Protected_Subprogram (Def);
4487 -- Constrained array case
4490 T := Create_Itype (E_Void, P, Related_Id, 'T');
4493 if Nkind (Def) = N_Constrained_Array_Definition then
4495 -- Establish Implicit_Base as unconstrained base type
4497 Implicit_Base := Create_Itype (E_Array_Type, P, Related_Id, 'B');
4499 Set_Etype (Implicit_Base, Implicit_Base);
4500 Set_Scope (Implicit_Base, Current_Scope);
4501 Set_Has_Delayed_Freeze (Implicit_Base);
4503 -- The constrained array type is a subtype of the unconstrained one
4505 Set_Ekind (T, E_Array_Subtype);
4506 Init_Size_Align (T);
4507 Set_Etype (T, Implicit_Base);
4508 Set_Scope (T, Current_Scope);
4509 Set_Is_Constrained (T, True);
4510 Set_First_Index (T, First (Discrete_Subtype_Definitions (Def)));
4511 Set_Has_Delayed_Freeze (T);
4513 -- Complete setup of implicit base type
4515 Set_First_Index (Implicit_Base, First_Index (T));
4516 Set_Component_Type (Implicit_Base, Element_Type);
4517 Set_Has_Task (Implicit_Base, Has_Task (Element_Type));
4518 Set_Component_Size (Implicit_Base, Uint_0);
4519 Set_Packed_Array_Type (Implicit_Base, Empty);
4520 Set_Has_Controlled_Component
4521 (Implicit_Base, Has_Controlled_Component
4523 or else Is_Controlled
4525 Set_Finalize_Storage_Only
4526 (Implicit_Base, Finalize_Storage_Only
4529 -- Unconstrained array case
4532 Set_Ekind (T, E_Array_Type);
4533 Init_Size_Align (T);
4535 Set_Scope (T, Current_Scope);
4536 Set_Component_Size (T, Uint_0);
4537 Set_Is_Constrained (T, False);
4538 Set_First_Index (T, First (Subtype_Marks (Def)));
4539 Set_Has_Delayed_Freeze (T, True);
4540 Set_Has_Task (T, Has_Task (Element_Type));
4541 Set_Has_Controlled_Component (T, Has_Controlled_Component
4544 Is_Controlled (Element_Type));
4545 Set_Finalize_Storage_Only (T, Finalize_Storage_Only
4549 -- Common attributes for both cases
4551 Set_Component_Type (Base_Type (T), Element_Type);
4552 Set_Packed_Array_Type (T, Empty);
4554 if Aliased_Present (Component_Definition (Def)) then
4555 Set_Has_Aliased_Components (Etype (T));
4558 -- Ada 2005 (AI-231): Propagate the null-excluding attribute to the
4559 -- array type to ensure that objects of this type are initialized.
4561 if Ada_Version >= Ada_2005
4562 and then Can_Never_Be_Null (Element_Type)
4564 Set_Can_Never_Be_Null (T);
4566 if Null_Exclusion_Present (Component_Definition (Def))
4568 -- No need to check itypes because in their case this check was
4569 -- done at their point of creation
4571 and then not Is_Itype (Element_Type)
4574 ("`NOT NULL` not allowed (null already excluded)",
4575 Subtype_Indication (Component_Definition (Def)));
4579 Priv := Private_Component (Element_Type);
4581 if Present (Priv) then
4583 -- Check for circular definitions
4585 if Priv = Any_Type then
4586 Set_Component_Type (Etype (T), Any_Type);
4588 -- There is a gap in the visibility of operations on the composite
4589 -- type only if the component type is defined in a different scope.
4591 elsif Scope (Priv) = Current_Scope then
4594 elsif Is_Limited_Type (Priv) then
4595 Set_Is_Limited_Composite (Etype (T));
4596 Set_Is_Limited_Composite (T);
4598 Set_Is_Private_Composite (Etype (T));
4599 Set_Is_Private_Composite (T);
4603 -- A syntax error in the declaration itself may lead to an empty index
4604 -- list, in which case do a minimal patch.
4606 if No (First_Index (T)) then
4607 Error_Msg_N ("missing index definition in array type declaration", T);
4610 Indexes : constant List_Id :=
4611 New_List (New_Occurrence_Of (Any_Id, Sloc (T)));
4613 Set_Discrete_Subtype_Definitions (Def, Indexes);
4614 Set_First_Index (T, First (Indexes));
4619 -- Create a concatenation operator for the new type. Internal array
4620 -- types created for packed entities do not need such, they are
4621 -- compatible with the user-defined type.
4623 if Number_Dimensions (T) = 1
4624 and then not Is_Packed_Array_Type (T)
4626 New_Concatenation_Op (T);
4629 -- In the case of an unconstrained array the parser has already verified
4630 -- that all the indexes are unconstrained but we still need to make sure
4631 -- that the element type is constrained.
4633 if Is_Indefinite_Subtype (Element_Type) then
4635 ("unconstrained element type in array declaration",
4636 Subtype_Indication (Component_Def));
4638 elsif Is_Abstract_Type (Element_Type) then
4640 ("the type of a component cannot be abstract",
4641 Subtype_Indication (Component_Def));
4643 end Array_Type_Declaration;
4645 ------------------------------------------------------
4646 -- Replace_Anonymous_Access_To_Protected_Subprogram --
4647 ------------------------------------------------------
4649 function Replace_Anonymous_Access_To_Protected_Subprogram
4650 (N : Node_Id) return Entity_Id
4652 Loc : constant Source_Ptr := Sloc (N);
4654 Curr_Scope : constant Scope_Stack_Entry :=
4655 Scope_Stack.Table (Scope_Stack.Last);
4657 Anon : constant Entity_Id := Make_Temporary (Loc, 'S');
4664 Set_Is_Internal (Anon);
4667 when N_Component_Declaration |
4668 N_Unconstrained_Array_Definition |
4669 N_Constrained_Array_Definition =>
4670 Comp := Component_Definition (N);
4671 Acc := Access_Definition (Comp);
4673 when N_Discriminant_Specification =>
4674 Comp := Discriminant_Type (N);
4677 when N_Parameter_Specification =>
4678 Comp := Parameter_Type (N);
4681 when N_Access_Function_Definition =>
4682 Comp := Result_Definition (N);
4685 when N_Object_Declaration =>
4686 Comp := Object_Definition (N);
4689 when N_Function_Specification =>
4690 Comp := Result_Definition (N);
4694 raise Program_Error;
4697 Decl := Make_Full_Type_Declaration (Loc,
4698 Defining_Identifier => Anon,
4700 Copy_Separate_Tree (Access_To_Subprogram_Definition (Acc)));
4702 Mark_Rewrite_Insertion (Decl);
4704 -- Insert the new declaration in the nearest enclosing scope. If the
4705 -- node is a body and N is its return type, the declaration belongs in
4706 -- the enclosing scope.
4710 if Nkind (P) = N_Subprogram_Body
4711 and then Nkind (N) = N_Function_Specification
4716 while Present (P) and then not Has_Declarations (P) loop
4720 pragma Assert (Present (P));
4722 if Nkind (P) = N_Package_Specification then
4723 Prepend (Decl, Visible_Declarations (P));
4725 Prepend (Decl, Declarations (P));
4728 -- Replace the anonymous type with an occurrence of the new declaration.
4729 -- In all cases the rewritten node does not have the null-exclusion
4730 -- attribute because (if present) it was already inherited by the
4731 -- anonymous entity (Anon). Thus, in case of components we do not
4732 -- inherit this attribute.
4734 if Nkind (N) = N_Parameter_Specification then
4735 Rewrite (Comp, New_Occurrence_Of (Anon, Loc));
4736 Set_Etype (Defining_Identifier (N), Anon);
4737 Set_Null_Exclusion_Present (N, False);
4739 elsif Nkind (N) = N_Object_Declaration then
4740 Rewrite (Comp, New_Occurrence_Of (Anon, Loc));
4741 Set_Etype (Defining_Identifier (N), Anon);
4743 elsif Nkind (N) = N_Access_Function_Definition then
4744 Rewrite (Comp, New_Occurrence_Of (Anon, Loc));
4746 elsif Nkind (N) = N_Function_Specification then
4747 Rewrite (Comp, New_Occurrence_Of (Anon, Loc));
4748 Set_Etype (Defining_Unit_Name (N), Anon);
4752 Make_Component_Definition (Loc,
4753 Subtype_Indication => New_Occurrence_Of (Anon, Loc)));
4756 Mark_Rewrite_Insertion (Comp);
4758 if Nkind_In (N, N_Object_Declaration, N_Access_Function_Definition) then
4762 -- Temporarily remove the current scope (record or subprogram) from
4763 -- the stack to add the new declarations to the enclosing scope.
4765 Scope_Stack.Decrement_Last;
4767 Set_Is_Itype (Anon);
4768 Scope_Stack.Append (Curr_Scope);
4771 Set_Ekind (Anon, E_Anonymous_Access_Protected_Subprogram_Type);
4772 Set_Can_Use_Internal_Rep (Anon, not Always_Compatible_Rep_On_Target);
4774 end Replace_Anonymous_Access_To_Protected_Subprogram;
4776 -------------------------------
4777 -- Build_Derived_Access_Type --
4778 -------------------------------
4780 procedure Build_Derived_Access_Type
4782 Parent_Type : Entity_Id;
4783 Derived_Type : Entity_Id)
4785 S : constant Node_Id := Subtype_Indication (Type_Definition (N));
4787 Desig_Type : Entity_Id;
4789 Discr_Con_Elist : Elist_Id;
4790 Discr_Con_El : Elmt_Id;
4794 -- Set the designated type so it is available in case this is an access
4795 -- to a self-referential type, e.g. a standard list type with a next
4796 -- pointer. Will be reset after subtype is built.
4798 Set_Directly_Designated_Type
4799 (Derived_Type, Designated_Type (Parent_Type));
4801 Subt := Process_Subtype (S, N);
4803 if Nkind (S) /= N_Subtype_Indication
4804 and then Subt /= Base_Type (Subt)
4806 Set_Ekind (Derived_Type, E_Access_Subtype);
4809 if Ekind (Derived_Type) = E_Access_Subtype then
4811 Pbase : constant Entity_Id := Base_Type (Parent_Type);
4812 Ibase : constant Entity_Id :=
4813 Create_Itype (Ekind (Pbase), N, Derived_Type, 'B');
4814 Svg_Chars : constant Name_Id := Chars (Ibase);
4815 Svg_Next_E : constant Entity_Id := Next_Entity (Ibase);
4818 Copy_Node (Pbase, Ibase);
4820 Set_Chars (Ibase, Svg_Chars);
4821 Set_Next_Entity (Ibase, Svg_Next_E);
4822 Set_Sloc (Ibase, Sloc (Derived_Type));
4823 Set_Scope (Ibase, Scope (Derived_Type));
4824 Set_Freeze_Node (Ibase, Empty);
4825 Set_Is_Frozen (Ibase, False);
4826 Set_Comes_From_Source (Ibase, False);
4827 Set_Is_First_Subtype (Ibase, False);
4829 Set_Etype (Ibase, Pbase);
4830 Set_Etype (Derived_Type, Ibase);
4834 Set_Directly_Designated_Type
4835 (Derived_Type, Designated_Type (Subt));
4837 Set_Is_Constrained (Derived_Type, Is_Constrained (Subt));
4838 Set_Is_Access_Constant (Derived_Type, Is_Access_Constant (Parent_Type));
4839 Set_Size_Info (Derived_Type, Parent_Type);
4840 Set_RM_Size (Derived_Type, RM_Size (Parent_Type));
4841 Set_Depends_On_Private (Derived_Type,
4842 Has_Private_Component (Derived_Type));
4843 Conditional_Delay (Derived_Type, Subt);
4845 -- Ada 2005 (AI-231): Set the null-exclusion attribute, and verify
4846 -- that it is not redundant.
4848 if Null_Exclusion_Present (Type_Definition (N)) then
4849 Set_Can_Never_Be_Null (Derived_Type);
4851 if Can_Never_Be_Null (Parent_Type)
4855 ("`NOT NULL` not allowed (& already excludes null)",
4859 elsif Can_Never_Be_Null (Parent_Type) then
4860 Set_Can_Never_Be_Null (Derived_Type);
4863 -- Note: we do not copy the Storage_Size_Variable, since we always go to
4864 -- the root type for this information.
4866 -- Apply range checks to discriminants for derived record case
4867 -- ??? THIS CODE SHOULD NOT BE HERE REALLY.
4869 Desig_Type := Designated_Type (Derived_Type);
4870 if Is_Composite_Type (Desig_Type)
4871 and then (not Is_Array_Type (Desig_Type))
4872 and then Has_Discriminants (Desig_Type)
4873 and then Base_Type (Desig_Type) /= Desig_Type
4875 Discr_Con_Elist := Discriminant_Constraint (Desig_Type);
4876 Discr_Con_El := First_Elmt (Discr_Con_Elist);
4878 Discr := First_Discriminant (Base_Type (Desig_Type));
4879 while Present (Discr_Con_El) loop
4880 Apply_Range_Check (Node (Discr_Con_El), Etype (Discr));
4881 Next_Elmt (Discr_Con_El);
4882 Next_Discriminant (Discr);
4885 end Build_Derived_Access_Type;
4887 ------------------------------
4888 -- Build_Derived_Array_Type --
4889 ------------------------------
4891 procedure Build_Derived_Array_Type
4893 Parent_Type : Entity_Id;
4894 Derived_Type : Entity_Id)
4896 Loc : constant Source_Ptr := Sloc (N);
4897 Tdef : constant Node_Id := Type_Definition (N);
4898 Indic : constant Node_Id := Subtype_Indication (Tdef);
4899 Parent_Base : constant Entity_Id := Base_Type (Parent_Type);
4900 Implicit_Base : Entity_Id;
4901 New_Indic : Node_Id;
4903 procedure Make_Implicit_Base;
4904 -- If the parent subtype is constrained, the derived type is a subtype
4905 -- of an implicit base type derived from the parent base.
4907 ------------------------
4908 -- Make_Implicit_Base --
4909 ------------------------
4911 procedure Make_Implicit_Base is
4914 Create_Itype (Ekind (Parent_Base), N, Derived_Type, 'B');
4916 Set_Ekind (Implicit_Base, Ekind (Parent_Base));
4917 Set_Etype (Implicit_Base, Parent_Base);
4919 Copy_Array_Subtype_Attributes (Implicit_Base, Parent_Base);
4920 Copy_Array_Base_Type_Attributes (Implicit_Base, Parent_Base);
4922 Set_Has_Delayed_Freeze (Implicit_Base, True);
4923 end Make_Implicit_Base;
4925 -- Start of processing for Build_Derived_Array_Type
4928 if not Is_Constrained (Parent_Type) then
4929 if Nkind (Indic) /= N_Subtype_Indication then
4930 Set_Ekind (Derived_Type, E_Array_Type);
4932 Copy_Array_Subtype_Attributes (Derived_Type, Parent_Type);
4933 Copy_Array_Base_Type_Attributes (Derived_Type, Parent_Type);
4935 Set_Has_Delayed_Freeze (Derived_Type, True);
4939 Set_Etype (Derived_Type, Implicit_Base);
4942 Make_Subtype_Declaration (Loc,
4943 Defining_Identifier => Derived_Type,
4944 Subtype_Indication =>
4945 Make_Subtype_Indication (Loc,
4946 Subtype_Mark => New_Reference_To (Implicit_Base, Loc),
4947 Constraint => Constraint (Indic)));
4949 Rewrite (N, New_Indic);
4954 if Nkind (Indic) /= N_Subtype_Indication then
4957 Set_Ekind (Derived_Type, Ekind (Parent_Type));
4958 Set_Etype (Derived_Type, Implicit_Base);
4959 Copy_Array_Subtype_Attributes (Derived_Type, Parent_Type);
4962 Error_Msg_N ("illegal constraint on constrained type", Indic);
4966 -- If parent type is not a derived type itself, and is declared in
4967 -- closed scope (e.g. a subprogram), then we must explicitly introduce
4968 -- the new type's concatenation operator since Derive_Subprograms
4969 -- will not inherit the parent's operator. If the parent type is
4970 -- unconstrained, the operator is of the unconstrained base type.
4972 if Number_Dimensions (Parent_Type) = 1
4973 and then not Is_Limited_Type (Parent_Type)
4974 and then not Is_Derived_Type (Parent_Type)
4975 and then not Is_Package_Or_Generic_Package
4976 (Scope (Base_Type (Parent_Type)))
4978 if not Is_Constrained (Parent_Type)
4979 and then Is_Constrained (Derived_Type)
4981 New_Concatenation_Op (Implicit_Base);
4983 New_Concatenation_Op (Derived_Type);
4986 end Build_Derived_Array_Type;
4988 -----------------------------------
4989 -- Build_Derived_Concurrent_Type --
4990 -----------------------------------
4992 procedure Build_Derived_Concurrent_Type
4994 Parent_Type : Entity_Id;
4995 Derived_Type : Entity_Id)
4997 Loc : constant Source_Ptr := Sloc (N);
4999 Corr_Record : constant Entity_Id := Make_Temporary (Loc, 'C');
5000 Corr_Decl : Node_Id;
5001 Corr_Decl_Needed : Boolean;
5002 -- If the derived type has fewer discriminants than its parent, the
5003 -- corresponding record is also a derived type, in order to account for
5004 -- the bound discriminants. We create a full type declaration for it in
5007 Constraint_Present : constant Boolean :=
5008 Nkind (Subtype_Indication (Type_Definition (N))) =
5009 N_Subtype_Indication;
5011 D_Constraint : Node_Id;
5012 New_Constraint : Elist_Id;
5013 Old_Disc : Entity_Id;
5014 New_Disc : Entity_Id;
5018 Set_Stored_Constraint (Derived_Type, No_Elist);
5019 Corr_Decl_Needed := False;
5022 if Present (Discriminant_Specifications (N))
5023 and then Constraint_Present
5025 Old_Disc := First_Discriminant (Parent_Type);
5026 New_Disc := First (Discriminant_Specifications (N));
5027 while Present (New_Disc) and then Present (Old_Disc) loop
5028 Next_Discriminant (Old_Disc);
5033 if Present (Old_Disc) then
5035 -- The new type has fewer discriminants, so we need to create a new
5036 -- corresponding record, which is derived from the corresponding
5037 -- record of the parent, and has a stored constraint that captures
5038 -- the values of the discriminant constraints.
5040 -- The type declaration for the derived corresponding record has
5041 -- the same discriminant part and constraints as the current
5042 -- declaration. Copy the unanalyzed tree to build declaration.
5044 Corr_Decl_Needed := True;
5045 New_N := Copy_Separate_Tree (N);
5048 Make_Full_Type_Declaration (Loc,
5049 Defining_Identifier => Corr_Record,
5050 Discriminant_Specifications =>
5051 Discriminant_Specifications (New_N),
5053 Make_Derived_Type_Definition (Loc,
5054 Subtype_Indication =>
5055 Make_Subtype_Indication (Loc,
5058 (Corresponding_Record_Type (Parent_Type), Loc),
5061 (Subtype_Indication (Type_Definition (New_N))))));
5064 -- Copy Storage_Size and Relative_Deadline variables if task case
5066 if Is_Task_Type (Parent_Type) then
5067 Set_Storage_Size_Variable (Derived_Type,
5068 Storage_Size_Variable (Parent_Type));
5069 Set_Relative_Deadline_Variable (Derived_Type,
5070 Relative_Deadline_Variable (Parent_Type));
5073 if Present (Discriminant_Specifications (N)) then
5074 Push_Scope (Derived_Type);
5075 Check_Or_Process_Discriminants (N, Derived_Type);
5077 if Constraint_Present then
5079 Expand_To_Stored_Constraint
5081 Build_Discriminant_Constraints
5083 Subtype_Indication (Type_Definition (N)), True));
5088 elsif Constraint_Present then
5090 -- Build constrained subtype and derive from it
5093 Loc : constant Source_Ptr := Sloc (N);
5094 Anon : constant Entity_Id :=
5095 Make_Defining_Identifier (Loc,
5096 New_External_Name (Chars (Derived_Type), 'T'));
5101 Make_Subtype_Declaration (Loc,
5102 Defining_Identifier => Anon,
5103 Subtype_Indication =>
5104 Subtype_Indication (Type_Definition (N)));
5105 Insert_Before (N, Decl);
5108 Rewrite (Subtype_Indication (Type_Definition (N)),
5109 New_Occurrence_Of (Anon, Loc));
5110 Set_Analyzed (Derived_Type, False);
5116 -- By default, operations and private data are inherited from parent.
5117 -- However, in the presence of bound discriminants, a new corresponding
5118 -- record will be created, see below.
5120 Set_Has_Discriminants
5121 (Derived_Type, Has_Discriminants (Parent_Type));
5122 Set_Corresponding_Record_Type
5123 (Derived_Type, Corresponding_Record_Type (Parent_Type));
5125 -- Is_Constrained is set according the parent subtype, but is set to
5126 -- False if the derived type is declared with new discriminants.
5130 (Is_Constrained (Parent_Type) or else Constraint_Present)
5131 and then not Present (Discriminant_Specifications (N)));
5133 if Constraint_Present then
5134 if not Has_Discriminants (Parent_Type) then
5135 Error_Msg_N ("untagged parent must have discriminants", N);
5137 elsif Present (Discriminant_Specifications (N)) then
5139 -- Verify that new discriminants are used to constrain old ones
5144 (Constraint (Subtype_Indication (Type_Definition (N)))));
5146 Old_Disc := First_Discriminant (Parent_Type);
5148 while Present (D_Constraint) loop
5149 if Nkind (D_Constraint) /= N_Discriminant_Association then
5151 -- Positional constraint. If it is a reference to a new
5152 -- discriminant, it constrains the corresponding old one.
5154 if Nkind (D_Constraint) = N_Identifier then
5155 New_Disc := First_Discriminant (Derived_Type);
5156 while Present (New_Disc) loop
5157 exit when Chars (New_Disc) = Chars (D_Constraint);
5158 Next_Discriminant (New_Disc);
5161 if Present (New_Disc) then
5162 Set_Corresponding_Discriminant (New_Disc, Old_Disc);
5166 Next_Discriminant (Old_Disc);
5168 -- if this is a named constraint, search by name for the old
5169 -- discriminants constrained by the new one.
5171 elsif Nkind (Expression (D_Constraint)) = N_Identifier then
5173 -- Find new discriminant with that name
5175 New_Disc := First_Discriminant (Derived_Type);
5176 while Present (New_Disc) loop
5178 Chars (New_Disc) = Chars (Expression (D_Constraint));
5179 Next_Discriminant (New_Disc);
5182 if Present (New_Disc) then
5184 -- Verify that new discriminant renames some discriminant
5185 -- of the parent type, and associate the new discriminant
5186 -- with one or more old ones that it renames.
5192 Selector := First (Selector_Names (D_Constraint));
5193 while Present (Selector) loop
5194 Old_Disc := First_Discriminant (Parent_Type);
5195 while Present (Old_Disc) loop
5196 exit when Chars (Old_Disc) = Chars (Selector);
5197 Next_Discriminant (Old_Disc);
5200 if Present (Old_Disc) then
5201 Set_Corresponding_Discriminant
5202 (New_Disc, Old_Disc);
5211 Next (D_Constraint);
5214 New_Disc := First_Discriminant (Derived_Type);
5215 while Present (New_Disc) loop
5216 if No (Corresponding_Discriminant (New_Disc)) then
5218 ("new discriminant& must constrain old one", N, New_Disc);
5221 Subtypes_Statically_Compatible
5223 Etype (Corresponding_Discriminant (New_Disc)))
5226 ("& not statically compatible with parent discriminant",
5230 Next_Discriminant (New_Disc);
5234 elsif Present (Discriminant_Specifications (N)) then
5236 ("missing discriminant constraint in untagged derivation", N);
5239 -- The entity chain of the derived type includes the new discriminants
5240 -- but shares operations with the parent.
5242 if Present (Discriminant_Specifications (N)) then
5243 Old_Disc := First_Discriminant (Parent_Type);
5244 while Present (Old_Disc) loop
5245 if No (Next_Entity (Old_Disc))
5246 or else Ekind (Next_Entity (Old_Disc)) /= E_Discriminant
5249 (Last_Entity (Derived_Type), Next_Entity (Old_Disc));
5253 Next_Discriminant (Old_Disc);
5257 Set_First_Entity (Derived_Type, First_Entity (Parent_Type));
5258 if Has_Discriminants (Parent_Type) then
5259 Set_Is_Constrained (Derived_Type, Is_Constrained (Parent_Type));
5260 Set_Discriminant_Constraint (
5261 Derived_Type, Discriminant_Constraint (Parent_Type));
5265 Set_Last_Entity (Derived_Type, Last_Entity (Parent_Type));
5267 Set_Has_Completion (Derived_Type);
5269 if Corr_Decl_Needed then
5270 Set_Stored_Constraint (Derived_Type, New_Constraint);
5271 Insert_After (N, Corr_Decl);
5272 Analyze (Corr_Decl);
5273 Set_Corresponding_Record_Type (Derived_Type, Corr_Record);
5275 end Build_Derived_Concurrent_Type;
5277 ------------------------------------
5278 -- Build_Derived_Enumeration_Type --
5279 ------------------------------------
5281 procedure Build_Derived_Enumeration_Type
5283 Parent_Type : Entity_Id;
5284 Derived_Type : Entity_Id)
5286 Loc : constant Source_Ptr := Sloc (N);
5287 Def : constant Node_Id := Type_Definition (N);
5288 Indic : constant Node_Id := Subtype_Indication (Def);
5289 Implicit_Base : Entity_Id;
5290 Literal : Entity_Id;
5291 New_Lit : Entity_Id;
5292 Literals_List : List_Id;
5293 Type_Decl : Node_Id;
5295 Rang_Expr : Node_Id;
5298 -- Since types Standard.Character and Standard.[Wide_]Wide_Character do
5299 -- not have explicit literals lists we need to process types derived
5300 -- from them specially. This is handled by Derived_Standard_Character.
5301 -- If the parent type is a generic type, there are no literals either,
5302 -- and we construct the same skeletal representation as for the generic
5305 if Is_Standard_Character_Type (Parent_Type) then
5306 Derived_Standard_Character (N, Parent_Type, Derived_Type);
5308 elsif Is_Generic_Type (Root_Type (Parent_Type)) then
5314 if Nkind (Indic) /= N_Subtype_Indication then
5316 Make_Attribute_Reference (Loc,
5317 Attribute_Name => Name_First,
5318 Prefix => New_Reference_To (Derived_Type, Loc));
5319 Set_Etype (Lo, Derived_Type);
5322 Make_Attribute_Reference (Loc,
5323 Attribute_Name => Name_Last,
5324 Prefix => New_Reference_To (Derived_Type, Loc));
5325 Set_Etype (Hi, Derived_Type);
5327 Set_Scalar_Range (Derived_Type,
5333 -- Analyze subtype indication and verify compatibility
5334 -- with parent type.
5336 if Base_Type (Process_Subtype (Indic, N)) /=
5337 Base_Type (Parent_Type)
5340 ("illegal constraint for formal discrete type", N);
5346 -- If a constraint is present, analyze the bounds to catch
5347 -- premature usage of the derived literals.
5349 if Nkind (Indic) = N_Subtype_Indication
5350 and then Nkind (Range_Expression (Constraint (Indic))) = N_Range
5352 Analyze (Low_Bound (Range_Expression (Constraint (Indic))));
5353 Analyze (High_Bound (Range_Expression (Constraint (Indic))));
5356 -- Introduce an implicit base type for the derived type even if there
5357 -- is no constraint attached to it, since this seems closer to the
5358 -- Ada semantics. Build a full type declaration tree for the derived
5359 -- type using the implicit base type as the defining identifier. The
5360 -- build a subtype declaration tree which applies the constraint (if
5361 -- any) have it replace the derived type declaration.
5363 Literal := First_Literal (Parent_Type);
5364 Literals_List := New_List;
5365 while Present (Literal)
5366 and then Ekind (Literal) = E_Enumeration_Literal
5368 -- Literals of the derived type have the same representation as
5369 -- those of the parent type, but this representation can be
5370 -- overridden by an explicit representation clause. Indicate
5371 -- that there is no explicit representation given yet. These
5372 -- derived literals are implicit operations of the new type,
5373 -- and can be overridden by explicit ones.
5375 if Nkind (Literal) = N_Defining_Character_Literal then
5377 Make_Defining_Character_Literal (Loc, Chars (Literal));
5379 New_Lit := Make_Defining_Identifier (Loc, Chars (Literal));
5382 Set_Ekind (New_Lit, E_Enumeration_Literal);
5383 Set_Enumeration_Pos (New_Lit, Enumeration_Pos (Literal));
5384 Set_Enumeration_Rep (New_Lit, Enumeration_Rep (Literal));
5385 Set_Enumeration_Rep_Expr (New_Lit, Empty);
5386 Set_Alias (New_Lit, Literal);
5387 Set_Is_Known_Valid (New_Lit, True);
5389 Append (New_Lit, Literals_List);
5390 Next_Literal (Literal);
5394 Make_Defining_Identifier (Sloc (Derived_Type),
5395 New_External_Name (Chars (Derived_Type), 'B'));
5397 -- Indicate the proper nature of the derived type. This must be done
5398 -- before analysis of the literals, to recognize cases when a literal
5399 -- may be hidden by a previous explicit function definition (cf.
5402 Set_Ekind (Derived_Type, E_Enumeration_Subtype);
5403 Set_Etype (Derived_Type, Implicit_Base);
5406 Make_Full_Type_Declaration (Loc,
5407 Defining_Identifier => Implicit_Base,
5408 Discriminant_Specifications => No_List,
5410 Make_Enumeration_Type_Definition (Loc, Literals_List));
5412 Mark_Rewrite_Insertion (Type_Decl);
5413 Insert_Before (N, Type_Decl);
5414 Analyze (Type_Decl);
5416 -- After the implicit base is analyzed its Etype needs to be changed
5417 -- to reflect the fact that it is derived from the parent type which
5418 -- was ignored during analysis. We also set the size at this point.
5420 Set_Etype (Implicit_Base, Parent_Type);
5422 Set_Size_Info (Implicit_Base, Parent_Type);
5423 Set_RM_Size (Implicit_Base, RM_Size (Parent_Type));
5424 Set_First_Rep_Item (Implicit_Base, First_Rep_Item (Parent_Type));
5426 -- Copy other flags from parent type
5428 Set_Has_Non_Standard_Rep
5429 (Implicit_Base, Has_Non_Standard_Rep
5431 Set_Has_Pragma_Ordered
5432 (Implicit_Base, Has_Pragma_Ordered
5434 Set_Has_Delayed_Freeze (Implicit_Base);
5436 -- Process the subtype indication including a validation check on the
5437 -- constraint, if any. If a constraint is given, its bounds must be
5438 -- implicitly converted to the new type.
5440 if Nkind (Indic) = N_Subtype_Indication then
5442 R : constant Node_Id :=
5443 Range_Expression (Constraint (Indic));
5446 if Nkind (R) = N_Range then
5447 Hi := Build_Scalar_Bound
5448 (High_Bound (R), Parent_Type, Implicit_Base);
5449 Lo := Build_Scalar_Bound
5450 (Low_Bound (R), Parent_Type, Implicit_Base);
5453 -- Constraint is a Range attribute. Replace with explicit
5454 -- mention of the bounds of the prefix, which must be a
5457 Analyze (Prefix (R));
5459 Convert_To (Implicit_Base,
5460 Make_Attribute_Reference (Loc,
5461 Attribute_Name => Name_Last,
5463 New_Occurrence_Of (Entity (Prefix (R)), Loc)));
5466 Convert_To (Implicit_Base,
5467 Make_Attribute_Reference (Loc,
5468 Attribute_Name => Name_First,
5470 New_Occurrence_Of (Entity (Prefix (R)), Loc)));
5477 (Type_High_Bound (Parent_Type),
5478 Parent_Type, Implicit_Base);
5481 (Type_Low_Bound (Parent_Type),
5482 Parent_Type, Implicit_Base);
5490 -- If we constructed a default range for the case where no range
5491 -- was given, then the expressions in the range must not freeze
5492 -- since they do not correspond to expressions in the source.
5494 if Nkind (Indic) /= N_Subtype_Indication then
5495 Set_Must_Not_Freeze (Lo);
5496 Set_Must_Not_Freeze (Hi);
5497 Set_Must_Not_Freeze (Rang_Expr);
5501 Make_Subtype_Declaration (Loc,
5502 Defining_Identifier => Derived_Type,
5503 Subtype_Indication =>
5504 Make_Subtype_Indication (Loc,
5505 Subtype_Mark => New_Occurrence_Of (Implicit_Base, Loc),
5507 Make_Range_Constraint (Loc,
5508 Range_Expression => Rang_Expr))));
5512 -- If pragma Discard_Names applies on the first subtype of the parent
5513 -- type, then it must be applied on this subtype as well.
5515 if Einfo.Discard_Names (First_Subtype (Parent_Type)) then
5516 Set_Discard_Names (Derived_Type);
5519 -- Apply a range check. Since this range expression doesn't have an
5520 -- Etype, we have to specifically pass the Source_Typ parameter. Is
5523 if Nkind (Indic) = N_Subtype_Indication then
5524 Apply_Range_Check (Range_Expression (Constraint (Indic)),
5526 Source_Typ => Entity (Subtype_Mark (Indic)));
5529 end Build_Derived_Enumeration_Type;
5531 --------------------------------
5532 -- Build_Derived_Numeric_Type --
5533 --------------------------------
5535 procedure Build_Derived_Numeric_Type
5537 Parent_Type : Entity_Id;
5538 Derived_Type : Entity_Id)
5540 Loc : constant Source_Ptr := Sloc (N);
5541 Tdef : constant Node_Id := Type_Definition (N);
5542 Indic : constant Node_Id := Subtype_Indication (Tdef);
5543 Parent_Base : constant Entity_Id := Base_Type (Parent_Type);
5544 No_Constraint : constant Boolean := Nkind (Indic) /=
5545 N_Subtype_Indication;
5546 Implicit_Base : Entity_Id;
5552 -- Process the subtype indication including a validation check on
5553 -- the constraint if any.
5555 Discard_Node (Process_Subtype (Indic, N));
5557 -- Introduce an implicit base type for the derived type even if there
5558 -- is no constraint attached to it, since this seems closer to the Ada
5562 Create_Itype (Ekind (Parent_Base), N, Derived_Type, 'B');
5564 Set_Etype (Implicit_Base, Parent_Base);
5565 Set_Ekind (Implicit_Base, Ekind (Parent_Base));
5566 Set_Size_Info (Implicit_Base, Parent_Base);
5567 Set_First_Rep_Item (Implicit_Base, First_Rep_Item (Parent_Base));
5568 Set_Parent (Implicit_Base, Parent (Derived_Type));
5569 Set_Is_Known_Valid (Implicit_Base, Is_Known_Valid (Parent_Base));
5571 -- Set RM Size for discrete type or decimal fixed-point type
5572 -- Ordinary fixed-point is excluded, why???
5574 if Is_Discrete_Type (Parent_Base)
5575 or else Is_Decimal_Fixed_Point_Type (Parent_Base)
5577 Set_RM_Size (Implicit_Base, RM_Size (Parent_Base));
5580 Set_Has_Delayed_Freeze (Implicit_Base);
5582 Lo := New_Copy_Tree (Type_Low_Bound (Parent_Base));
5583 Hi := New_Copy_Tree (Type_High_Bound (Parent_Base));
5585 Set_Scalar_Range (Implicit_Base,
5590 if Has_Infinities (Parent_Base) then
5591 Set_Includes_Infinities (Scalar_Range (Implicit_Base));
5594 -- The Derived_Type, which is the entity of the declaration, is a
5595 -- subtype of the implicit base. Its Ekind is a subtype, even in the
5596 -- absence of an explicit constraint.
5598 Set_Etype (Derived_Type, Implicit_Base);
5600 -- If we did not have a constraint, then the Ekind is set from the
5601 -- parent type (otherwise Process_Subtype has set the bounds)
5603 if No_Constraint then
5604 Set_Ekind (Derived_Type, Subtype_Kind (Ekind (Parent_Type)));
5607 -- If we did not have a range constraint, then set the range from the
5608 -- parent type. Otherwise, the Process_Subtype call has set the bounds.
5611 or else not Has_Range_Constraint (Indic)
5613 Set_Scalar_Range (Derived_Type,
5615 Low_Bound => New_Copy_Tree (Type_Low_Bound (Parent_Type)),
5616 High_Bound => New_Copy_Tree (Type_High_Bound (Parent_Type))));
5617 Set_Is_Constrained (Derived_Type, Is_Constrained (Parent_Type));
5619 if Has_Infinities (Parent_Type) then
5620 Set_Includes_Infinities (Scalar_Range (Derived_Type));
5623 Set_Is_Known_Valid (Derived_Type, Is_Known_Valid (Parent_Type));
5626 Set_Is_Descendent_Of_Address (Derived_Type,
5627 Is_Descendent_Of_Address (Parent_Type));
5628 Set_Is_Descendent_Of_Address (Implicit_Base,
5629 Is_Descendent_Of_Address (Parent_Type));
5631 -- Set remaining type-specific fields, depending on numeric type
5633 if Is_Modular_Integer_Type (Parent_Type) then
5634 Set_Modulus (Implicit_Base, Modulus (Parent_Base));
5636 Set_Non_Binary_Modulus
5637 (Implicit_Base, Non_Binary_Modulus (Parent_Base));
5640 (Implicit_Base, Is_Known_Valid (Parent_Base));
5642 elsif Is_Floating_Point_Type (Parent_Type) then
5644 -- Digits of base type is always copied from the digits value of
5645 -- the parent base type, but the digits of the derived type will
5646 -- already have been set if there was a constraint present.
5648 Set_Digits_Value (Implicit_Base, Digits_Value (Parent_Base));
5649 Set_Float_Rep (Implicit_Base, Float_Rep (Parent_Base));
5651 if No_Constraint then
5652 Set_Digits_Value (Derived_Type, Digits_Value (Parent_Type));
5655 elsif Is_Fixed_Point_Type (Parent_Type) then
5657 -- Small of base type and derived type are always copied from the
5658 -- parent base type, since smalls never change. The delta of the
5659 -- base type is also copied from the parent base type. However the
5660 -- delta of the derived type will have been set already if a
5661 -- constraint was present.
5663 Set_Small_Value (Derived_Type, Small_Value (Parent_Base));
5664 Set_Small_Value (Implicit_Base, Small_Value (Parent_Base));
5665 Set_Delta_Value (Implicit_Base, Delta_Value (Parent_Base));
5667 if No_Constraint then
5668 Set_Delta_Value (Derived_Type, Delta_Value (Parent_Type));
5671 -- The scale and machine radix in the decimal case are always
5672 -- copied from the parent base type.
5674 if Is_Decimal_Fixed_Point_Type (Parent_Type) then
5675 Set_Scale_Value (Derived_Type, Scale_Value (Parent_Base));
5676 Set_Scale_Value (Implicit_Base, Scale_Value (Parent_Base));
5678 Set_Machine_Radix_10
5679 (Derived_Type, Machine_Radix_10 (Parent_Base));
5680 Set_Machine_Radix_10
5681 (Implicit_Base, Machine_Radix_10 (Parent_Base));
5683 Set_Digits_Value (Implicit_Base, Digits_Value (Parent_Base));
5685 if No_Constraint then
5686 Set_Digits_Value (Derived_Type, Digits_Value (Parent_Base));
5689 -- the analysis of the subtype_indication sets the
5690 -- digits value of the derived type.
5697 -- The type of the bounds is that of the parent type, and they
5698 -- must be converted to the derived type.
5700 Convert_Scalar_Bounds (N, Parent_Type, Derived_Type, Loc);
5702 -- The implicit_base should be frozen when the derived type is frozen,
5703 -- but note that it is used in the conversions of the bounds. For fixed
5704 -- types we delay the determination of the bounds until the proper
5705 -- freezing point. For other numeric types this is rejected by GCC, for
5706 -- reasons that are currently unclear (???), so we choose to freeze the
5707 -- implicit base now. In the case of integers and floating point types
5708 -- this is harmless because subsequent representation clauses cannot
5709 -- affect anything, but it is still baffling that we cannot use the
5710 -- same mechanism for all derived numeric types.
5712 -- There is a further complication: actually *some* representation
5713 -- clauses can affect the implicit base type. Namely, attribute
5714 -- definition clauses for stream-oriented attributes need to set the
5715 -- corresponding TSS entries on the base type, and this normally cannot
5716 -- be done after the base type is frozen, so the circuitry in
5717 -- Sem_Ch13.New_Stream_Subprogram must account for this possibility and
5718 -- not use Set_TSS in this case.
5720 if Is_Fixed_Point_Type (Parent_Type) then
5721 Conditional_Delay (Implicit_Base, Parent_Type);
5723 Freeze_Before (N, Implicit_Base);
5725 end Build_Derived_Numeric_Type;
5727 --------------------------------
5728 -- Build_Derived_Private_Type --
5729 --------------------------------
5731 procedure Build_Derived_Private_Type
5733 Parent_Type : Entity_Id;
5734 Derived_Type : Entity_Id;
5735 Is_Completion : Boolean;
5736 Derive_Subps : Boolean := True)
5738 Loc : constant Source_Ptr := Sloc (N);
5739 Der_Base : Entity_Id;
5741 Full_Decl : Node_Id := Empty;
5742 Full_Der : Entity_Id;
5744 Last_Discr : Entity_Id;
5745 Par_Scope : constant Entity_Id := Scope (Base_Type (Parent_Type));
5746 Swapped : Boolean := False;
5748 procedure Copy_And_Build;
5749 -- Copy derived type declaration, replace parent with its full view,
5750 -- and analyze new declaration.
5752 --------------------
5753 -- Copy_And_Build --
5754 --------------------
5756 procedure Copy_And_Build is
5760 if Ekind (Parent_Type) in Record_Kind
5762 (Ekind (Parent_Type) in Enumeration_Kind
5763 and then not Is_Standard_Character_Type (Parent_Type)
5764 and then not Is_Generic_Type (Root_Type (Parent_Type)))
5766 Full_N := New_Copy_Tree (N);
5767 Insert_After (N, Full_N);
5768 Build_Derived_Type (
5769 Full_N, Parent_Type, Full_Der, True, Derive_Subps => False);
5772 Build_Derived_Type (
5773 N, Parent_Type, Full_Der, True, Derive_Subps => False);
5777 -- Start of processing for Build_Derived_Private_Type
5780 if Is_Tagged_Type (Parent_Type) then
5781 Full_P := Full_View (Parent_Type);
5783 -- A type extension of a type with unknown discriminants is an
5784 -- indefinite type that the back-end cannot handle directly.
5785 -- We treat it as a private type, and build a completion that is
5786 -- derived from the full view of the parent, and hopefully has
5787 -- known discriminants.
5789 -- If the full view of the parent type has an underlying record view,
5790 -- use it to generate the underlying record view of this derived type
5791 -- (required for chains of derivations with unknown discriminants).
5793 -- Minor optimization: we avoid the generation of useless underlying
5794 -- record view entities if the private type declaration has unknown
5795 -- discriminants but its corresponding full view has no
5798 if Has_Unknown_Discriminants (Parent_Type)
5799 and then Present (Full_P)
5800 and then (Has_Discriminants (Full_P)
5801 or else Present (Underlying_Record_View (Full_P)))
5802 and then not In_Open_Scopes (Par_Scope)
5803 and then Expander_Active
5806 Full_Der : constant Entity_Id := Make_Temporary (Loc, 'T');
5807 New_Ext : constant Node_Id :=
5809 (Record_Extension_Part (Type_Definition (N)));
5813 Build_Derived_Record_Type
5814 (N, Parent_Type, Derived_Type, Derive_Subps);
5816 -- Build anonymous completion, as a derivation from the full
5817 -- view of the parent. This is not a completion in the usual
5818 -- sense, because the current type is not private.
5821 Make_Full_Type_Declaration (Loc,
5822 Defining_Identifier => Full_Der,
5824 Make_Derived_Type_Definition (Loc,
5825 Subtype_Indication =>
5827 (Subtype_Indication (Type_Definition (N))),
5828 Record_Extension_Part => New_Ext));
5830 -- If the parent type has an underlying record view, use it
5831 -- here to build the new underlying record view.
5833 if Present (Underlying_Record_View (Full_P)) then
5835 (Nkind (Subtype_Indication (Type_Definition (Decl)))
5837 Set_Entity (Subtype_Indication (Type_Definition (Decl)),
5838 Underlying_Record_View (Full_P));
5841 Install_Private_Declarations (Par_Scope);
5842 Install_Visible_Declarations (Par_Scope);
5843 Insert_Before (N, Decl);
5845 -- Mark entity as an underlying record view before analysis,
5846 -- to avoid generating the list of its primitive operations
5847 -- (which is not really required for this entity) and thus
5848 -- prevent spurious errors associated with missing overriding
5849 -- of abstract primitives (overridden only for Derived_Type).
5851 Set_Ekind (Full_Der, E_Record_Type);
5852 Set_Is_Underlying_Record_View (Full_Der);
5856 pragma Assert (Has_Discriminants (Full_Der)
5857 and then not Has_Unknown_Discriminants (Full_Der));
5859 Uninstall_Declarations (Par_Scope);
5861 -- Freeze the underlying record view, to prevent generation of
5862 -- useless dispatching information, which is simply shared with
5863 -- the real derived type.
5865 Set_Is_Frozen (Full_Der);
5867 -- Set up links between real entity and underlying record view
5869 Set_Underlying_Record_View (Derived_Type, Base_Type (Full_Der));
5870 Set_Underlying_Record_View (Base_Type (Full_Der), Derived_Type);
5873 -- If discriminants are known, build derived record
5876 Build_Derived_Record_Type
5877 (N, Parent_Type, Derived_Type, Derive_Subps);
5882 elsif Has_Discriminants (Parent_Type) then
5883 if Present (Full_View (Parent_Type)) then
5884 if not Is_Completion then
5886 -- Copy declaration for subsequent analysis, to provide a
5887 -- completion for what is a private declaration. Indicate that
5888 -- the full type is internally generated.
5890 Full_Decl := New_Copy_Tree (N);
5891 Full_Der := New_Copy (Derived_Type);
5892 Set_Comes_From_Source (Full_Decl, False);
5893 Set_Comes_From_Source (Full_Der, False);
5894 Set_Parent (Full_Der, Full_Decl);
5896 Insert_After (N, Full_Decl);
5899 -- If this is a completion, the full view being built is itself
5900 -- private. We build a subtype of the parent with the same
5901 -- constraints as this full view, to convey to the back end the
5902 -- constrained components and the size of this subtype. If the
5903 -- parent is constrained, its full view can serve as the
5904 -- underlying full view of the derived type.
5906 if No (Discriminant_Specifications (N)) then
5907 if Nkind (Subtype_Indication (Type_Definition (N))) =
5908 N_Subtype_Indication
5910 Build_Underlying_Full_View (N, Derived_Type, Parent_Type);
5912 elsif Is_Constrained (Full_View (Parent_Type)) then
5913 Set_Underlying_Full_View
5914 (Derived_Type, Full_View (Parent_Type));
5918 -- If there are new discriminants, the parent subtype is
5919 -- constrained by them, but it is not clear how to build
5920 -- the Underlying_Full_View in this case???
5927 -- Build partial view of derived type from partial view of parent
5929 Build_Derived_Record_Type
5930 (N, Parent_Type, Derived_Type, Derive_Subps);
5932 if Present (Full_View (Parent_Type)) and then not Is_Completion then
5933 if not In_Open_Scopes (Par_Scope)
5934 or else not In_Same_Source_Unit (N, Parent_Type)
5936 -- Swap partial and full views temporarily
5938 Install_Private_Declarations (Par_Scope);
5939 Install_Visible_Declarations (Par_Scope);
5943 -- Build full view of derived type from full view of parent which
5944 -- is now installed. Subprograms have been derived on the partial
5945 -- view, the completion does not derive them anew.
5947 if not Is_Tagged_Type (Parent_Type) then
5949 -- If the parent is itself derived from another private type,
5950 -- installing the private declarations has not affected its
5951 -- privacy status, so use its own full view explicitly.
5953 if Is_Private_Type (Parent_Type) then
5954 Build_Derived_Record_Type
5955 (Full_Decl, Full_View (Parent_Type), Full_Der, False);
5957 Build_Derived_Record_Type
5958 (Full_Decl, Parent_Type, Full_Der, False);
5962 -- If full view of parent is tagged, the completion inherits
5963 -- the proper primitive operations.
5965 Set_Defining_Identifier (Full_Decl, Full_Der);
5966 Build_Derived_Record_Type
5967 (Full_Decl, Parent_Type, Full_Der, Derive_Subps);
5970 -- The full declaration has been introduced into the tree and
5971 -- processed in the step above. It should not be analyzed again
5972 -- (when encountered later in the current list of declarations)
5973 -- to prevent spurious name conflicts. The full entity remains
5976 Set_Analyzed (Full_Decl);
5979 Uninstall_Declarations (Par_Scope);
5981 if In_Open_Scopes (Par_Scope) then
5982 Install_Visible_Declarations (Par_Scope);
5986 Der_Base := Base_Type (Derived_Type);
5987 Set_Full_View (Derived_Type, Full_Der);
5988 Set_Full_View (Der_Base, Base_Type (Full_Der));
5990 -- Copy the discriminant list from full view to the partial views
5991 -- (base type and its subtype). Gigi requires that the partial and
5992 -- full views have the same discriminants.
5994 -- Note that since the partial view is pointing to discriminants
5995 -- in the full view, their scope will be that of the full view.
5996 -- This might cause some front end problems and need adjustment???
5998 Discr := First_Discriminant (Base_Type (Full_Der));
5999 Set_First_Entity (Der_Base, Discr);
6002 Last_Discr := Discr;
6003 Next_Discriminant (Discr);
6004 exit when No (Discr);
6007 Set_Last_Entity (Der_Base, Last_Discr);
6009 Set_First_Entity (Derived_Type, First_Entity (Der_Base));
6010 Set_Last_Entity (Derived_Type, Last_Entity (Der_Base));
6011 Set_Stored_Constraint (Full_Der, Stored_Constraint (Derived_Type));
6014 -- If this is a completion, the derived type stays private and
6015 -- there is no need to create a further full view, except in the
6016 -- unusual case when the derivation is nested within a child unit,
6022 elsif Present (Full_View (Parent_Type))
6023 and then Has_Discriminants (Full_View (Parent_Type))
6025 if Has_Unknown_Discriminants (Parent_Type)
6026 and then Nkind (Subtype_Indication (Type_Definition (N))) =
6027 N_Subtype_Indication
6030 ("cannot constrain type with unknown discriminants",
6031 Subtype_Indication (Type_Definition (N)));
6035 -- If full view of parent is a record type, build full view as a
6036 -- derivation from the parent's full view. Partial view remains
6037 -- private. For code generation and linking, the full view must have
6038 -- the same public status as the partial one. This full view is only
6039 -- needed if the parent type is in an enclosing scope, so that the
6040 -- full view may actually become visible, e.g. in a child unit. This
6041 -- is both more efficient, and avoids order of freezing problems with
6042 -- the added entities.
6044 if not Is_Private_Type (Full_View (Parent_Type))
6045 and then (In_Open_Scopes (Scope (Parent_Type)))
6047 Full_Der := Make_Defining_Identifier (Sloc (Derived_Type),
6048 Chars (Derived_Type));
6049 Set_Is_Itype (Full_Der);
6050 Set_Has_Private_Declaration (Full_Der);
6051 Set_Has_Private_Declaration (Derived_Type);
6052 Set_Associated_Node_For_Itype (Full_Der, N);
6053 Set_Parent (Full_Der, Parent (Derived_Type));
6054 Set_Full_View (Derived_Type, Full_Der);
6055 Set_Is_Public (Full_Der, Is_Public (Derived_Type));
6056 Full_P := Full_View (Parent_Type);
6057 Exchange_Declarations (Parent_Type);
6059 Exchange_Declarations (Full_P);
6062 Build_Derived_Record_Type
6063 (N, Full_View (Parent_Type), Derived_Type,
6064 Derive_Subps => False);
6067 -- In any case, the primitive operations are inherited from the
6068 -- parent type, not from the internal full view.
6070 Set_Etype (Base_Type (Derived_Type), Base_Type (Parent_Type));
6072 if Derive_Subps then
6073 Derive_Subprograms (Parent_Type, Derived_Type);
6077 -- Untagged type, No discriminants on either view
6079 if Nkind (Subtype_Indication (Type_Definition (N))) =
6080 N_Subtype_Indication
6083 ("illegal constraint on type without discriminants", N);
6086 if Present (Discriminant_Specifications (N))
6087 and then Present (Full_View (Parent_Type))
6088 and then not Is_Tagged_Type (Full_View (Parent_Type))
6090 Error_Msg_N ("cannot add discriminants to untagged type", N);
6093 Set_Stored_Constraint (Derived_Type, No_Elist);
6094 Set_Is_Constrained (Derived_Type, Is_Constrained (Parent_Type));
6095 Set_Is_Controlled (Derived_Type, Is_Controlled (Parent_Type));
6096 Set_Has_Controlled_Component
6097 (Derived_Type, Has_Controlled_Component
6100 -- Direct controlled types do not inherit Finalize_Storage_Only flag
6102 if not Is_Controlled (Parent_Type) then
6103 Set_Finalize_Storage_Only
6104 (Base_Type (Derived_Type), Finalize_Storage_Only (Parent_Type));
6107 -- Construct the implicit full view by deriving from full view of the
6108 -- parent type. In order to get proper visibility, we install the
6109 -- parent scope and its declarations.
6111 -- ??? If the parent is untagged private and its completion is
6112 -- tagged, this mechanism will not work because we cannot derive from
6113 -- the tagged full view unless we have an extension.
6115 if Present (Full_View (Parent_Type))
6116 and then not Is_Tagged_Type (Full_View (Parent_Type))
6117 and then not Is_Completion
6120 Make_Defining_Identifier (Sloc (Derived_Type),
6121 Chars => Chars (Derived_Type));
6122 Set_Is_Itype (Full_Der);
6123 Set_Has_Private_Declaration (Full_Der);
6124 Set_Has_Private_Declaration (Derived_Type);
6125 Set_Associated_Node_For_Itype (Full_Der, N);
6126 Set_Parent (Full_Der, Parent (Derived_Type));
6127 Set_Full_View (Derived_Type, Full_Der);
6129 if not In_Open_Scopes (Par_Scope) then
6130 Install_Private_Declarations (Par_Scope);
6131 Install_Visible_Declarations (Par_Scope);
6133 Uninstall_Declarations (Par_Scope);
6135 -- If parent scope is open and in another unit, and parent has a
6136 -- completion, then the derivation is taking place in the visible
6137 -- part of a child unit. In that case retrieve the full view of
6138 -- the parent momentarily.
6140 elsif not In_Same_Source_Unit (N, Parent_Type) then
6141 Full_P := Full_View (Parent_Type);
6142 Exchange_Declarations (Parent_Type);
6144 Exchange_Declarations (Full_P);
6146 -- Otherwise it is a local derivation
6152 Set_Scope (Full_Der, Current_Scope);
6153 Set_Is_First_Subtype (Full_Der,
6154 Is_First_Subtype (Derived_Type));
6155 Set_Has_Size_Clause (Full_Der, False);
6156 Set_Has_Alignment_Clause (Full_Der, False);
6157 Set_Next_Entity (Full_Der, Empty);
6158 Set_Has_Delayed_Freeze (Full_Der);
6159 Set_Is_Frozen (Full_Der, False);
6160 Set_Freeze_Node (Full_Der, Empty);
6161 Set_Depends_On_Private (Full_Der,
6162 Has_Private_Component (Full_Der));
6163 Set_Public_Status (Full_Der);
6167 Set_Has_Unknown_Discriminants (Derived_Type,
6168 Has_Unknown_Discriminants (Parent_Type));
6170 if Is_Private_Type (Derived_Type) then
6171 Set_Private_Dependents (Derived_Type, New_Elmt_List);
6174 if Is_Private_Type (Parent_Type)
6175 and then Base_Type (Parent_Type) = Parent_Type
6176 and then In_Open_Scopes (Scope (Parent_Type))
6178 Append_Elmt (Derived_Type, Private_Dependents (Parent_Type));
6180 if Is_Child_Unit (Scope (Current_Scope))
6181 and then Is_Completion
6182 and then In_Private_Part (Current_Scope)
6183 and then Scope (Parent_Type) /= Current_Scope
6185 -- This is the unusual case where a type completed by a private
6186 -- derivation occurs within a package nested in a child unit, and
6187 -- the parent is declared in an ancestor. In this case, the full
6188 -- view of the parent type will become visible in the body of
6189 -- the enclosing child, and only then will the current type be
6190 -- possibly non-private. We build a underlying full view that
6191 -- will be installed when the enclosing child body is compiled.
6194 Make_Defining_Identifier (Sloc (Derived_Type),
6195 Chars => Chars (Derived_Type));
6196 Set_Is_Itype (Full_Der);
6197 Build_Itype_Reference (Full_Der, N);
6199 -- The full view will be used to swap entities on entry/exit to
6200 -- the body, and must appear in the entity list for the package.
6202 Append_Entity (Full_Der, Scope (Derived_Type));
6203 Set_Has_Private_Declaration (Full_Der);
6204 Set_Has_Private_Declaration (Derived_Type);
6205 Set_Associated_Node_For_Itype (Full_Der, N);
6206 Set_Parent (Full_Der, Parent (Derived_Type));
6207 Full_P := Full_View (Parent_Type);
6208 Exchange_Declarations (Parent_Type);
6210 Exchange_Declarations (Full_P);
6211 Set_Underlying_Full_View (Derived_Type, Full_Der);
6214 end Build_Derived_Private_Type;
6216 -------------------------------
6217 -- Build_Derived_Record_Type --
6218 -------------------------------
6222 -- Ideally we would like to use the same model of type derivation for
6223 -- tagged and untagged record types. Unfortunately this is not quite
6224 -- possible because the semantics of representation clauses is different
6225 -- for tagged and untagged records under inheritance. Consider the
6228 -- type R (...) is [tagged] record ... end record;
6229 -- type T (...) is new R (...) [with ...];
6231 -- The representation clauses for T can specify a completely different
6232 -- record layout from R's. Hence the same component can be placed in two
6233 -- very different positions in objects of type T and R. If R and T are
6234 -- tagged types, representation clauses for T can only specify the layout
6235 -- of non inherited components, thus components that are common in R and T
6236 -- have the same position in objects of type R and T.
6238 -- This has two implications. The first is that the entire tree for R's
6239 -- declaration needs to be copied for T in the untagged case, so that T
6240 -- can be viewed as a record type of its own with its own representation
6241 -- clauses. The second implication is the way we handle discriminants.
6242 -- Specifically, in the untagged case we need a way to communicate to Gigi
6243 -- what are the real discriminants in the record, while for the semantics
6244 -- we need to consider those introduced by the user to rename the
6245 -- discriminants in the parent type. This is handled by introducing the
6246 -- notion of stored discriminants. See below for more.
6248 -- Fortunately the way regular components are inherited can be handled in
6249 -- the same way in tagged and untagged types.
6251 -- To complicate things a bit more the private view of a private extension
6252 -- cannot be handled in the same way as the full view (for one thing the
6253 -- semantic rules are somewhat different). We will explain what differs
6256 -- 2. DISCRIMINANTS UNDER INHERITANCE
6258 -- The semantic rules governing the discriminants of derived types are
6261 -- type Derived_Type_Name [KNOWN_DISCRIMINANT_PART] is new
6262 -- [abstract] Parent_Type_Name [CONSTRAINT] [RECORD_EXTENSION_PART]
6264 -- If parent type has discriminants, then the discriminants that are
6265 -- declared in the derived type are [3.4 (11)]:
6267 -- o The discriminants specified by a new KNOWN_DISCRIMINANT_PART, if
6270 -- o Otherwise, each discriminant of the parent type (implicitly declared
6271 -- in the same order with the same specifications). In this case, the
6272 -- discriminants are said to be "inherited", or if unknown in the parent
6273 -- are also unknown in the derived type.
6275 -- Furthermore if a KNOWN_DISCRIMINANT_PART is provided, then [3.7(13-18)]:
6277 -- o The parent subtype shall be constrained;
6279 -- o If the parent type is not a tagged type, then each discriminant of
6280 -- the derived type shall be used in the constraint defining a parent
6281 -- subtype. [Implementation note: This ensures that the new discriminant
6282 -- can share storage with an existing discriminant.]
6284 -- For the derived type each discriminant of the parent type is either
6285 -- inherited, constrained to equal some new discriminant of the derived
6286 -- type, or constrained to the value of an expression.
6288 -- When inherited or constrained to equal some new discriminant, the
6289 -- parent discriminant and the discriminant of the derived type are said
6292 -- If a discriminant of the parent type is constrained to a specific value
6293 -- in the derived type definition, then the discriminant is said to be
6294 -- "specified" by that derived type definition.
6296 -- 3. DISCRIMINANTS IN DERIVED UNTAGGED RECORD TYPES
6298 -- We have spoken about stored discriminants in point 1 (introduction)
6299 -- above. There are two sort of stored discriminants: implicit and
6300 -- explicit. As long as the derived type inherits the same discriminants as
6301 -- the root record type, stored discriminants are the same as regular
6302 -- discriminants, and are said to be implicit. However, if any discriminant
6303 -- in the root type was renamed in the derived type, then the derived
6304 -- type will contain explicit stored discriminants. Explicit stored
6305 -- discriminants are discriminants in addition to the semantically visible
6306 -- discriminants defined for the derived type. Stored discriminants are
6307 -- used by Gigi to figure out what are the physical discriminants in
6308 -- objects of the derived type (see precise definition in einfo.ads).
6309 -- As an example, consider the following:
6311 -- type R (D1, D2, D3 : Int) is record ... end record;
6312 -- type T1 is new R;
6313 -- type T2 (X1, X2: Int) is new T1 (X2, 88, X1);
6314 -- type T3 is new T2;
6315 -- type T4 (Y : Int) is new T3 (Y, 99);
6317 -- The following table summarizes the discriminants and stored
6318 -- discriminants in R and T1 through T4.
6320 -- Type Discrim Stored Discrim Comment
6321 -- R (D1, D2, D3) (D1, D2, D3) Girder discrims implicit in R
6322 -- T1 (D1, D2, D3) (D1, D2, D3) Girder discrims implicit in T1
6323 -- T2 (X1, X2) (D1, D2, D3) Girder discrims EXPLICIT in T2
6324 -- T3 (X1, X2) (D1, D2, D3) Girder discrims EXPLICIT in T3
6325 -- T4 (Y) (D1, D2, D3) Girder discrims EXPLICIT in T4
6327 -- Field Corresponding_Discriminant (abbreviated CD below) allows us to
6328 -- find the corresponding discriminant in the parent type, while
6329 -- Original_Record_Component (abbreviated ORC below), the actual physical
6330 -- component that is renamed. Finally the field Is_Completely_Hidden
6331 -- (abbreviated ICH below) is set for all explicit stored discriminants
6332 -- (see einfo.ads for more info). For the above example this gives:
6334 -- Discrim CD ORC ICH
6335 -- ^^^^^^^ ^^ ^^^ ^^^
6336 -- D1 in R empty itself no
6337 -- D2 in R empty itself no
6338 -- D3 in R empty itself no
6340 -- D1 in T1 D1 in R itself no
6341 -- D2 in T1 D2 in R itself no
6342 -- D3 in T1 D3 in R itself no
6344 -- X1 in T2 D3 in T1 D3 in T2 no
6345 -- X2 in T2 D1 in T1 D1 in T2 no
6346 -- D1 in T2 empty itself yes
6347 -- D2 in T2 empty itself yes
6348 -- D3 in T2 empty itself yes
6350 -- X1 in T3 X1 in T2 D3 in T3 no
6351 -- X2 in T3 X2 in T2 D1 in T3 no
6352 -- D1 in T3 empty itself yes
6353 -- D2 in T3 empty itself yes
6354 -- D3 in T3 empty itself yes
6356 -- Y in T4 X1 in T3 D3 in T3 no
6357 -- D1 in T3 empty itself yes
6358 -- D2 in T3 empty itself yes
6359 -- D3 in T3 empty itself yes
6361 -- 4. DISCRIMINANTS IN DERIVED TAGGED RECORD TYPES
6363 -- Type derivation for tagged types is fairly straightforward. If no
6364 -- discriminants are specified by the derived type, these are inherited
6365 -- from the parent. No explicit stored discriminants are ever necessary.
6366 -- The only manipulation that is done to the tree is that of adding a
6367 -- _parent field with parent type and constrained to the same constraint
6368 -- specified for the parent in the derived type definition. For instance:
6370 -- type R (D1, D2, D3 : Int) is tagged record ... end record;
6371 -- type T1 is new R with null record;
6372 -- type T2 (X1, X2: Int) is new T1 (X2, 88, X1) with null record;
6374 -- are changed into:
6376 -- type T1 (D1, D2, D3 : Int) is new R (D1, D2, D3) with record
6377 -- _parent : R (D1, D2, D3);
6380 -- type T2 (X1, X2: Int) is new T1 (X2, 88, X1) with record
6381 -- _parent : T1 (X2, 88, X1);
6384 -- The discriminants actually present in R, T1 and T2 as well as their CD,
6385 -- ORC and ICH fields are:
6387 -- Discrim CD ORC ICH
6388 -- ^^^^^^^ ^^ ^^^ ^^^
6389 -- D1 in R empty itself no
6390 -- D2 in R empty itself no
6391 -- D3 in R empty itself no
6393 -- D1 in T1 D1 in R D1 in R no
6394 -- D2 in T1 D2 in R D2 in R no
6395 -- D3 in T1 D3 in R D3 in R no
6397 -- X1 in T2 D3 in T1 D3 in R no
6398 -- X2 in T2 D1 in T1 D1 in R no
6400 -- 5. FIRST TRANSFORMATION FOR DERIVED RECORDS
6402 -- Regardless of whether we dealing with a tagged or untagged type
6403 -- we will transform all derived type declarations of the form
6405 -- type T is new R (...) [with ...];
6407 -- subtype S is R (...);
6408 -- type T is new S [with ...];
6410 -- type BT is new R [with ...];
6411 -- subtype T is BT (...);
6413 -- That is, the base derived type is constrained only if it has no
6414 -- discriminants. The reason for doing this is that GNAT's semantic model
6415 -- assumes that a base type with discriminants is unconstrained.
6417 -- Note that, strictly speaking, the above transformation is not always
6418 -- correct. Consider for instance the following excerpt from ACVC b34011a:
6420 -- procedure B34011A is
6421 -- type REC (D : integer := 0) is record
6426 -- type T6 is new Rec;
6427 -- function F return T6;
6432 -- type U is new T6 (Q6.F.I); -- ERROR: Q6.F.
6435 -- The definition of Q6.U is illegal. However transforming Q6.U into
6437 -- type BaseU is new T6;
6438 -- subtype U is BaseU (Q6.F.I)
6440 -- turns U into a legal subtype, which is incorrect. To avoid this problem
6441 -- we always analyze the constraint (in this case (Q6.F.I)) before applying
6442 -- the transformation described above.
6444 -- There is another instance where the above transformation is incorrect.
6448 -- type Base (D : Integer) is tagged null record;
6449 -- procedure P (X : Base);
6451 -- type Der is new Base (2) with null record;
6452 -- procedure P (X : Der);
6455 -- Then the above transformation turns this into
6457 -- type Der_Base is new Base with null record;
6458 -- -- procedure P (X : Base) is implicitly inherited here
6459 -- -- as procedure P (X : Der_Base).
6461 -- subtype Der is Der_Base (2);
6462 -- procedure P (X : Der);
6463 -- -- The overriding of P (X : Der_Base) is illegal since we
6464 -- -- have a parameter conformance problem.
6466 -- To get around this problem, after having semantically processed Der_Base
6467 -- and the rewritten subtype declaration for Der, we copy Der_Base field
6468 -- Discriminant_Constraint from Der so that when parameter conformance is
6469 -- checked when P is overridden, no semantic errors are flagged.
6471 -- 6. SECOND TRANSFORMATION FOR DERIVED RECORDS
6473 -- Regardless of whether we are dealing with a tagged or untagged type
6474 -- we will transform all derived type declarations of the form
6476 -- type R (D1, .., Dn : ...) is [tagged] record ...;
6477 -- type T is new R [with ...];
6479 -- type T (D1, .., Dn : ...) is new R (D1, .., Dn) [with ...];
6481 -- The reason for such transformation is that it allows us to implement a
6482 -- very clean form of component inheritance as explained below.
6484 -- Note that this transformation is not achieved by direct tree rewriting
6485 -- and manipulation, but rather by redoing the semantic actions that the
6486 -- above transformation will entail. This is done directly in routine
6487 -- Inherit_Components.
6489 -- 7. TYPE DERIVATION AND COMPONENT INHERITANCE
6491 -- In both tagged and untagged derived types, regular non discriminant
6492 -- components are inherited in the derived type from the parent type. In
6493 -- the absence of discriminants component, inheritance is straightforward
6494 -- as components can simply be copied from the parent.
6496 -- If the parent has discriminants, inheriting components constrained with
6497 -- these discriminants requires caution. Consider the following example:
6499 -- type R (D1, D2 : Positive) is [tagged] record
6500 -- S : String (D1 .. D2);
6503 -- type T1 is new R [with null record];
6504 -- type T2 (X : positive) is new R (1, X) [with null record];
6506 -- As explained in 6. above, T1 is rewritten as
6507 -- type T1 (D1, D2 : Positive) is new R (D1, D2) [with null record];
6508 -- which makes the treatment for T1 and T2 identical.
6510 -- What we want when inheriting S, is that references to D1 and D2 in R are
6511 -- replaced with references to their correct constraints, i.e. D1 and D2 in
6512 -- T1 and 1 and X in T2. So all R's discriminant references are replaced
6513 -- with either discriminant references in the derived type or expressions.
6514 -- This replacement is achieved as follows: before inheriting R's
6515 -- components, a subtype R (D1, D2) for T1 (resp. R (1, X) for T2) is
6516 -- created in the scope of T1 (resp. scope of T2) so that discriminants D1
6517 -- and D2 of T1 are visible (resp. discriminant X of T2 is visible).
6518 -- For T2, for instance, this has the effect of replacing String (D1 .. D2)
6519 -- by String (1 .. X).
6521 -- 8. TYPE DERIVATION IN PRIVATE TYPE EXTENSIONS
6523 -- We explain here the rules governing private type extensions relevant to
6524 -- type derivation. These rules are explained on the following example:
6526 -- type D [(...)] is new A [(...)] with private; <-- partial view
6527 -- type D [(...)] is new P [(...)] with null record; <-- full view
6529 -- Type A is called the ancestor subtype of the private extension.
6530 -- Type P is the parent type of the full view of the private extension. It
6531 -- must be A or a type derived from A.
6533 -- The rules concerning the discriminants of private type extensions are
6536 -- o If a private extension inherits known discriminants from the ancestor
6537 -- subtype, then the full view shall also inherit its discriminants from
6538 -- the ancestor subtype and the parent subtype of the full view shall be
6539 -- constrained if and only if the ancestor subtype is constrained.
6541 -- o If a partial view has unknown discriminants, then the full view may
6542 -- define a definite or an indefinite subtype, with or without
6545 -- o If a partial view has neither known nor unknown discriminants, then
6546 -- the full view shall define a definite subtype.
6548 -- o If the ancestor subtype of a private extension has constrained
6549 -- discriminants, then the parent subtype of the full view shall impose a
6550 -- statically matching constraint on those discriminants.
6552 -- This means that only the following forms of private extensions are
6555 -- type D is new A with private; <-- partial view
6556 -- type D is new P with null record; <-- full view
6558 -- If A has no discriminants than P has no discriminants, otherwise P must
6559 -- inherit A's discriminants.
6561 -- type D is new A (...) with private; <-- partial view
6562 -- type D is new P (:::) with null record; <-- full view
6564 -- P must inherit A's discriminants and (...) and (:::) must statically
6567 -- subtype A is R (...);
6568 -- type D is new A with private; <-- partial view
6569 -- type D is new P with null record; <-- full view
6571 -- P must have inherited R's discriminants and must be derived from A or
6572 -- any of its subtypes.
6574 -- type D (..) is new A with private; <-- partial view
6575 -- type D (..) is new P [(:::)] with null record; <-- full view
6577 -- No specific constraints on P's discriminants or constraint (:::).
6578 -- Note that A can be unconstrained, but the parent subtype P must either
6579 -- be constrained or (:::) must be present.
6581 -- type D (..) is new A [(...)] with private; <-- partial view
6582 -- type D (..) is new P [(:::)] with null record; <-- full view
6584 -- P's constraints on A's discriminants must statically match those
6585 -- imposed by (...).
6587 -- 9. IMPLEMENTATION OF TYPE DERIVATION FOR PRIVATE EXTENSIONS
6589 -- The full view of a private extension is handled exactly as described
6590 -- above. The model chose for the private view of a private extension is
6591 -- the same for what concerns discriminants (i.e. they receive the same
6592 -- treatment as in the tagged case). However, the private view of the
6593 -- private extension always inherits the components of the parent base,
6594 -- without replacing any discriminant reference. Strictly speaking this is
6595 -- incorrect. However, Gigi never uses this view to generate code so this
6596 -- is a purely semantic issue. In theory, a set of transformations similar
6597 -- to those given in 5. and 6. above could be applied to private views of
6598 -- private extensions to have the same model of component inheritance as
6599 -- for non private extensions. However, this is not done because it would
6600 -- further complicate private type processing. Semantically speaking, this
6601 -- leaves us in an uncomfortable situation. As an example consider:
6604 -- type R (D : integer) is tagged record
6605 -- S : String (1 .. D);
6607 -- procedure P (X : R);
6608 -- type T is new R (1) with private;
6610 -- type T is new R (1) with null record;
6613 -- This is transformed into:
6616 -- type R (D : integer) is tagged record
6617 -- S : String (1 .. D);
6619 -- procedure P (X : R);
6620 -- type T is new R (1) with private;
6622 -- type BaseT is new R with null record;
6623 -- subtype T is BaseT (1);
6626 -- (strictly speaking the above is incorrect Ada)
6628 -- From the semantic standpoint the private view of private extension T
6629 -- should be flagged as constrained since one can clearly have
6633 -- in a unit withing Pack. However, when deriving subprograms for the
6634 -- private view of private extension T, T must be seen as unconstrained
6635 -- since T has discriminants (this is a constraint of the current
6636 -- subprogram derivation model). Thus, when processing the private view of
6637 -- a private extension such as T, we first mark T as unconstrained, we
6638 -- process it, we perform program derivation and just before returning from
6639 -- Build_Derived_Record_Type we mark T as constrained.
6641 -- ??? Are there are other uncomfortable cases that we will have to
6644 -- 10. RECORD_TYPE_WITH_PRIVATE complications
6646 -- Types that are derived from a visible record type and have a private
6647 -- extension present other peculiarities. They behave mostly like private
6648 -- types, but if they have primitive operations defined, these will not
6649 -- have the proper signatures for further inheritance, because other
6650 -- primitive operations will use the implicit base that we define for
6651 -- private derivations below. This affect subprogram inheritance (see
6652 -- Derive_Subprograms for details). We also derive the implicit base from
6653 -- the base type of the full view, so that the implicit base is a record
6654 -- type and not another private type, This avoids infinite loops.
6656 procedure Build_Derived_Record_Type
6658 Parent_Type : Entity_Id;
6659 Derived_Type : Entity_Id;
6660 Derive_Subps : Boolean := True)
6662 Loc : constant Source_Ptr := Sloc (N);
6663 Parent_Base : Entity_Id;
6666 Discrim : Entity_Id;
6667 Last_Discrim : Entity_Id;
6670 Discs : Elist_Id := New_Elmt_List;
6671 -- An empty Discs list means that there were no constraints in the
6672 -- subtype indication or that there was an error processing it.
6674 Assoc_List : Elist_Id;
6675 New_Discrs : Elist_Id;
6676 New_Base : Entity_Id;
6678 New_Indic : Node_Id;
6680 Is_Tagged : constant Boolean := Is_Tagged_Type (Parent_Type);
6681 Discriminant_Specs : constant Boolean :=
6682 Present (Discriminant_Specifications (N));
6683 Private_Extension : constant Boolean :=
6684 Nkind (N) = N_Private_Extension_Declaration;
6686 Constraint_Present : Boolean;
6687 Inherit_Discrims : Boolean := False;
6688 Save_Etype : Entity_Id;
6689 Save_Discr_Constr : Elist_Id;
6690 Save_Next_Entity : Entity_Id;
6693 if Ekind (Parent_Type) = E_Record_Type_With_Private
6694 and then Present (Full_View (Parent_Type))
6695 and then Has_Discriminants (Parent_Type)
6697 Parent_Base := Base_Type (Full_View (Parent_Type));
6699 Parent_Base := Base_Type (Parent_Type);
6702 -- Before we start the previously documented transformations, here is
6703 -- little fix for size and alignment of tagged types. Normally when we
6704 -- derive type D from type P, we copy the size and alignment of P as the
6705 -- default for D, and in the absence of explicit representation clauses
6706 -- for D, the size and alignment are indeed the same as the parent.
6708 -- But this is wrong for tagged types, since fields may be added, and
6709 -- the default size may need to be larger, and the default alignment may
6710 -- need to be larger.
6712 -- We therefore reset the size and alignment fields in the tagged case.
6713 -- Note that the size and alignment will in any case be at least as
6714 -- large as the parent type (since the derived type has a copy of the
6715 -- parent type in the _parent field)
6717 -- The type is also marked as being tagged here, which is needed when
6718 -- processing components with a self-referential anonymous access type
6719 -- in the call to Check_Anonymous_Access_Components below. Note that
6720 -- this flag is also set later on for completeness.
6723 Set_Is_Tagged_Type (Derived_Type);
6724 Init_Size_Align (Derived_Type);
6727 -- STEP 0a: figure out what kind of derived type declaration we have
6729 if Private_Extension then
6731 Set_Ekind (Derived_Type, E_Record_Type_With_Private);
6734 Type_Def := Type_Definition (N);
6736 -- Ekind (Parent_Base) is not necessarily E_Record_Type since
6737 -- Parent_Base can be a private type or private extension. However,
6738 -- for tagged types with an extension the newly added fields are
6739 -- visible and hence the Derived_Type is always an E_Record_Type.
6740 -- (except that the parent may have its own private fields).
6741 -- For untagged types we preserve the Ekind of the Parent_Base.
6743 if Present (Record_Extension_Part (Type_Def)) then
6744 Set_Ekind (Derived_Type, E_Record_Type);
6746 -- Create internal access types for components with anonymous
6749 if Ada_Version >= Ada_2005 then
6750 Check_Anonymous_Access_Components
6751 (N, Derived_Type, Derived_Type,
6752 Component_List (Record_Extension_Part (Type_Def)));
6756 Set_Ekind (Derived_Type, Ekind (Parent_Base));
6760 -- Indic can either be an N_Identifier if the subtype indication
6761 -- contains no constraint or an N_Subtype_Indication if the subtype
6762 -- indication has a constraint.
6764 Indic := Subtype_Indication (Type_Def);
6765 Constraint_Present := (Nkind (Indic) = N_Subtype_Indication);
6767 -- Check that the type has visible discriminants. The type may be
6768 -- a private type with unknown discriminants whose full view has
6769 -- discriminants which are invisible.
6771 if Constraint_Present then
6772 if not Has_Discriminants (Parent_Base)
6774 (Has_Unknown_Discriminants (Parent_Base)
6775 and then Is_Private_Type (Parent_Base))
6778 ("invalid constraint: type has no discriminant",
6779 Constraint (Indic));
6781 Constraint_Present := False;
6782 Rewrite (Indic, New_Copy_Tree (Subtype_Mark (Indic)));
6784 elsif Is_Constrained (Parent_Type) then
6786 ("invalid constraint: parent type is already constrained",
6787 Constraint (Indic));
6789 Constraint_Present := False;
6790 Rewrite (Indic, New_Copy_Tree (Subtype_Mark (Indic)));
6794 -- STEP 0b: If needed, apply transformation given in point 5. above
6796 if not Private_Extension
6797 and then Has_Discriminants (Parent_Type)
6798 and then not Discriminant_Specs
6799 and then (Is_Constrained (Parent_Type) or else Constraint_Present)
6801 -- First, we must analyze the constraint (see comment in point 5.)
6803 if Constraint_Present then
6804 New_Discrs := Build_Discriminant_Constraints (Parent_Type, Indic);
6806 if Has_Discriminants (Derived_Type)
6807 and then Has_Private_Declaration (Derived_Type)
6808 and then Present (Discriminant_Constraint (Derived_Type))
6810 -- Verify that constraints of the full view statically match
6811 -- those given in the partial view.
6817 C1 := First_Elmt (New_Discrs);
6818 C2 := First_Elmt (Discriminant_Constraint (Derived_Type));
6819 while Present (C1) and then Present (C2) loop
6820 if Fully_Conformant_Expressions (Node (C1), Node (C2))
6822 (Is_OK_Static_Expression (Node (C1))
6824 Is_OK_Static_Expression (Node (C2))
6826 Expr_Value (Node (C1)) = Expr_Value (Node (C2)))
6832 "constraint not conformant to previous declaration",
6843 -- Insert and analyze the declaration for the unconstrained base type
6845 New_Base := Create_Itype (Ekind (Derived_Type), N, Derived_Type, 'B');
6848 Make_Full_Type_Declaration (Loc,
6849 Defining_Identifier => New_Base,
6851 Make_Derived_Type_Definition (Loc,
6852 Abstract_Present => Abstract_Present (Type_Def),
6853 Limited_Present => Limited_Present (Type_Def),
6854 Subtype_Indication =>
6855 New_Occurrence_Of (Parent_Base, Loc),
6856 Record_Extension_Part =>
6857 Relocate_Node (Record_Extension_Part (Type_Def)),
6858 Interface_List => Interface_List (Type_Def)));
6860 Set_Parent (New_Decl, Parent (N));
6861 Mark_Rewrite_Insertion (New_Decl);
6862 Insert_Before (N, New_Decl);
6864 -- In the extension case, make sure ancestor is frozen appropriately
6865 -- (see also non-discriminated case below).
6867 if Present (Record_Extension_Part (Type_Def))
6868 or else Is_Interface (Parent_Base)
6870 Freeze_Before (New_Decl, Parent_Type);
6873 -- Note that this call passes False for the Derive_Subps parameter
6874 -- because subprogram derivation is deferred until after creating
6875 -- the subtype (see below).
6878 (New_Decl, Parent_Base, New_Base,
6879 Is_Completion => True, Derive_Subps => False);
6881 -- ??? This needs re-examination to determine whether the
6882 -- above call can simply be replaced by a call to Analyze.
6884 Set_Analyzed (New_Decl);
6886 -- Insert and analyze the declaration for the constrained subtype
6888 if Constraint_Present then
6890 Make_Subtype_Indication (Loc,
6891 Subtype_Mark => New_Occurrence_Of (New_Base, Loc),
6892 Constraint => Relocate_Node (Constraint (Indic)));
6896 Constr_List : constant List_Id := New_List;
6901 C := First_Elmt (Discriminant_Constraint (Parent_Type));
6902 while Present (C) loop
6905 -- It is safe here to call New_Copy_Tree since
6906 -- Force_Evaluation was called on each constraint in
6907 -- Build_Discriminant_Constraints.
6909 Append (New_Copy_Tree (Expr), To => Constr_List);
6915 Make_Subtype_Indication (Loc,
6916 Subtype_Mark => New_Occurrence_Of (New_Base, Loc),
6918 Make_Index_Or_Discriminant_Constraint (Loc, Constr_List));
6923 Make_Subtype_Declaration (Loc,
6924 Defining_Identifier => Derived_Type,
6925 Subtype_Indication => New_Indic));
6929 -- Derivation of subprograms must be delayed until the full subtype
6930 -- has been established to ensure proper overriding of subprograms
6931 -- inherited by full types. If the derivations occurred as part of
6932 -- the call to Build_Derived_Type above, then the check for type
6933 -- conformance would fail because earlier primitive subprograms
6934 -- could still refer to the full type prior the change to the new
6935 -- subtype and hence would not match the new base type created here.
6937 Derive_Subprograms (Parent_Type, Derived_Type);
6939 -- For tagged types the Discriminant_Constraint of the new base itype
6940 -- is inherited from the first subtype so that no subtype conformance
6941 -- problem arise when the first subtype overrides primitive
6942 -- operations inherited by the implicit base type.
6945 Set_Discriminant_Constraint
6946 (New_Base, Discriminant_Constraint (Derived_Type));
6952 -- If we get here Derived_Type will have no discriminants or it will be
6953 -- a discriminated unconstrained base type.
6955 -- STEP 1a: perform preliminary actions/checks for derived tagged types
6959 -- The parent type is frozen for non-private extensions (RM 13.14(7))
6960 -- The declaration of a specific descendant of an interface type
6961 -- freezes the interface type (RM 13.14).
6963 if not Private_Extension or else Is_Interface (Parent_Base) then
6964 Freeze_Before (N, Parent_Type);
6967 -- In Ada 2005 (AI-344), the restriction that a derived tagged type
6968 -- cannot be declared at a deeper level than its parent type is
6969 -- removed. The check on derivation within a generic body is also
6970 -- relaxed, but there's a restriction that a derived tagged type
6971 -- cannot be declared in a generic body if it's derived directly
6972 -- or indirectly from a formal type of that generic.
6974 if Ada_Version >= Ada_2005 then
6975 if Present (Enclosing_Generic_Body (Derived_Type)) then
6977 Ancestor_Type : Entity_Id;
6980 -- Check to see if any ancestor of the derived type is a
6983 Ancestor_Type := Parent_Type;
6984 while not Is_Generic_Type (Ancestor_Type)
6985 and then Etype (Ancestor_Type) /= Ancestor_Type
6987 Ancestor_Type := Etype (Ancestor_Type);
6990 -- If the derived type does have a formal type as an
6991 -- ancestor, then it's an error if the derived type is
6992 -- declared within the body of the generic unit that
6993 -- declares the formal type in its generic formal part. It's
6994 -- sufficient to check whether the ancestor type is declared
6995 -- inside the same generic body as the derived type (such as
6996 -- within a nested generic spec), in which case the
6997 -- derivation is legal. If the formal type is declared
6998 -- outside of that generic body, then it's guaranteed that
6999 -- the derived type is declared within the generic body of
7000 -- the generic unit declaring the formal type.
7002 if Is_Generic_Type (Ancestor_Type)
7003 and then Enclosing_Generic_Body (Ancestor_Type) /=
7004 Enclosing_Generic_Body (Derived_Type)
7007 ("parent type of& must not be descendant of formal type"
7008 & " of an enclosing generic body",
7009 Indic, Derived_Type);
7014 elsif Type_Access_Level (Derived_Type) /=
7015 Type_Access_Level (Parent_Type)
7016 and then not Is_Generic_Type (Derived_Type)
7018 if Is_Controlled (Parent_Type) then
7020 ("controlled type must be declared at the library level",
7024 ("type extension at deeper accessibility level than parent",
7030 GB : constant Node_Id := Enclosing_Generic_Body (Derived_Type);
7034 and then GB /= Enclosing_Generic_Body (Parent_Base)
7037 ("parent type of& must not be outside generic body"
7039 Indic, Derived_Type);
7045 -- Ada 2005 (AI-251)
7047 if Ada_Version >= Ada_2005 and then Is_Tagged then
7049 -- "The declaration of a specific descendant of an interface type
7050 -- freezes the interface type" (RM 13.14).
7055 if Is_Non_Empty_List (Interface_List (Type_Def)) then
7056 Iface := First (Interface_List (Type_Def));
7057 while Present (Iface) loop
7058 Freeze_Before (N, Etype (Iface));
7065 -- STEP 1b : preliminary cleanup of the full view of private types
7067 -- If the type is already marked as having discriminants, then it's the
7068 -- completion of a private type or private extension and we need to
7069 -- retain the discriminants from the partial view if the current
7070 -- declaration has Discriminant_Specifications so that we can verify
7071 -- conformance. However, we must remove any existing components that
7072 -- were inherited from the parent (and attached in Copy_And_Swap)
7073 -- because the full type inherits all appropriate components anyway, and
7074 -- we do not want the partial view's components interfering.
7076 if Has_Discriminants (Derived_Type) and then Discriminant_Specs then
7077 Discrim := First_Discriminant (Derived_Type);
7079 Last_Discrim := Discrim;
7080 Next_Discriminant (Discrim);
7081 exit when No (Discrim);
7084 Set_Last_Entity (Derived_Type, Last_Discrim);
7086 -- In all other cases wipe out the list of inherited components (even
7087 -- inherited discriminants), it will be properly rebuilt here.
7090 Set_First_Entity (Derived_Type, Empty);
7091 Set_Last_Entity (Derived_Type, Empty);
7094 -- STEP 1c: Initialize some flags for the Derived_Type
7096 -- The following flags must be initialized here so that
7097 -- Process_Discriminants can check that discriminants of tagged types do
7098 -- not have a default initial value and that access discriminants are
7099 -- only specified for limited records. For completeness, these flags are
7100 -- also initialized along with all the other flags below.
7102 -- AI-419: Limitedness is not inherited from an interface parent, so to
7103 -- be limited in that case the type must be explicitly declared as
7104 -- limited. However, task and protected interfaces are always limited.
7106 if Limited_Present (Type_Def) then
7107 Set_Is_Limited_Record (Derived_Type);
7109 elsif Is_Limited_Record (Parent_Type)
7110 or else (Present (Full_View (Parent_Type))
7111 and then Is_Limited_Record (Full_View (Parent_Type)))
7113 if not Is_Interface (Parent_Type)
7114 or else Is_Synchronized_Interface (Parent_Type)
7115 or else Is_Protected_Interface (Parent_Type)
7116 or else Is_Task_Interface (Parent_Type)
7118 Set_Is_Limited_Record (Derived_Type);
7122 -- STEP 2a: process discriminants of derived type if any
7124 Push_Scope (Derived_Type);
7126 if Discriminant_Specs then
7127 Set_Has_Unknown_Discriminants (Derived_Type, False);
7129 -- The following call initializes fields Has_Discriminants and
7130 -- Discriminant_Constraint, unless we are processing the completion
7131 -- of a private type declaration.
7133 Check_Or_Process_Discriminants (N, Derived_Type);
7135 -- For untagged types, the constraint on the Parent_Type must be
7136 -- present and is used to rename the discriminants.
7138 if not Is_Tagged and then not Has_Discriminants (Parent_Type) then
7139 Error_Msg_N ("untagged parent must have discriminants", Indic);
7141 elsif not Is_Tagged and then not Constraint_Present then
7143 ("discriminant constraint needed for derived untagged records",
7146 -- Otherwise the parent subtype must be constrained unless we have a
7147 -- private extension.
7149 elsif not Constraint_Present
7150 and then not Private_Extension
7151 and then not Is_Constrained (Parent_Type)
7154 ("unconstrained type not allowed in this context", Indic);
7156 elsif Constraint_Present then
7157 -- The following call sets the field Corresponding_Discriminant
7158 -- for the discriminants in the Derived_Type.
7160 Discs := Build_Discriminant_Constraints (Parent_Type, Indic, True);
7162 -- For untagged types all new discriminants must rename
7163 -- discriminants in the parent. For private extensions new
7164 -- discriminants cannot rename old ones (implied by [7.3(13)]).
7166 Discrim := First_Discriminant (Derived_Type);
7167 while Present (Discrim) loop
7169 and then No (Corresponding_Discriminant (Discrim))
7172 ("new discriminants must constrain old ones", Discrim);
7174 elsif Private_Extension
7175 and then Present (Corresponding_Discriminant (Discrim))
7178 ("only static constraints allowed for parent"
7179 & " discriminants in the partial view", Indic);
7183 -- If a new discriminant is used in the constraint, then its
7184 -- subtype must be statically compatible with the parent
7185 -- discriminant's subtype (3.7(15)).
7187 if Present (Corresponding_Discriminant (Discrim))
7189 not Subtypes_Statically_Compatible
7191 Etype (Corresponding_Discriminant (Discrim)))
7194 ("subtype must be compatible with parent discriminant",
7198 Next_Discriminant (Discrim);
7201 -- Check whether the constraints of the full view statically
7202 -- match those imposed by the parent subtype [7.3(13)].
7204 if Present (Stored_Constraint (Derived_Type)) then
7209 C1 := First_Elmt (Discs);
7210 C2 := First_Elmt (Stored_Constraint (Derived_Type));
7211 while Present (C1) and then Present (C2) loop
7213 Fully_Conformant_Expressions (Node (C1), Node (C2))
7216 ("not conformant with previous declaration",
7227 -- STEP 2b: No new discriminants, inherit discriminants if any
7230 if Private_Extension then
7231 Set_Has_Unknown_Discriminants
7233 Has_Unknown_Discriminants (Parent_Type)
7234 or else Unknown_Discriminants_Present (N));
7236 -- The partial view of the parent may have unknown discriminants,
7237 -- but if the full view has discriminants and the parent type is
7238 -- in scope they must be inherited.
7240 elsif Has_Unknown_Discriminants (Parent_Type)
7242 (not Has_Discriminants (Parent_Type)
7243 or else not In_Open_Scopes (Scope (Parent_Type)))
7245 Set_Has_Unknown_Discriminants (Derived_Type);
7248 if not Has_Unknown_Discriminants (Derived_Type)
7249 and then not Has_Unknown_Discriminants (Parent_Base)
7250 and then Has_Discriminants (Parent_Type)
7252 Inherit_Discrims := True;
7253 Set_Has_Discriminants
7254 (Derived_Type, True);
7255 Set_Discriminant_Constraint
7256 (Derived_Type, Discriminant_Constraint (Parent_Base));
7259 -- The following test is true for private types (remember
7260 -- transformation 5. is not applied to those) and in an error
7263 if Constraint_Present then
7264 Discs := Build_Discriminant_Constraints (Parent_Type, Indic);
7267 -- For now mark a new derived type as constrained only if it has no
7268 -- discriminants. At the end of Build_Derived_Record_Type we properly
7269 -- set this flag in the case of private extensions. See comments in
7270 -- point 9. just before body of Build_Derived_Record_Type.
7274 not (Inherit_Discrims
7275 or else Has_Unknown_Discriminants (Derived_Type)));
7278 -- STEP 3: initialize fields of derived type
7280 Set_Is_Tagged_Type (Derived_Type, Is_Tagged);
7281 Set_Stored_Constraint (Derived_Type, No_Elist);
7283 -- Ada 2005 (AI-251): Private type-declarations can implement interfaces
7284 -- but cannot be interfaces
7286 if not Private_Extension
7287 and then Ekind (Derived_Type) /= E_Private_Type
7288 and then Ekind (Derived_Type) /= E_Limited_Private_Type
7290 if Interface_Present (Type_Def) then
7291 Analyze_Interface_Declaration (Derived_Type, Type_Def);
7294 Set_Interfaces (Derived_Type, No_Elist);
7297 -- Fields inherited from the Parent_Type
7300 (Derived_Type, Einfo.Discard_Names (Parent_Type));
7301 Set_Has_Specified_Layout
7302 (Derived_Type, Has_Specified_Layout (Parent_Type));
7303 Set_Is_Limited_Composite
7304 (Derived_Type, Is_Limited_Composite (Parent_Type));
7305 Set_Is_Private_Composite
7306 (Derived_Type, Is_Private_Composite (Parent_Type));
7308 -- Fields inherited from the Parent_Base
7310 Set_Has_Controlled_Component
7311 (Derived_Type, Has_Controlled_Component (Parent_Base));
7312 Set_Has_Non_Standard_Rep
7313 (Derived_Type, Has_Non_Standard_Rep (Parent_Base));
7314 Set_Has_Primitive_Operations
7315 (Derived_Type, Has_Primitive_Operations (Parent_Base));
7317 -- Fields inherited from the Parent_Base in the non-private case
7319 if Ekind (Derived_Type) = E_Record_Type then
7320 Set_Has_Complex_Representation
7321 (Derived_Type, Has_Complex_Representation (Parent_Base));
7324 -- Fields inherited from the Parent_Base for record types
7326 if Is_Record_Type (Derived_Type) then
7328 -- Ekind (Parent_Base) is not necessarily E_Record_Type since
7329 -- Parent_Base can be a private type or private extension.
7331 if Present (Full_View (Parent_Base)) then
7332 Set_OK_To_Reorder_Components
7334 OK_To_Reorder_Components (Full_View (Parent_Base)));
7335 Set_Reverse_Bit_Order
7336 (Derived_Type, Reverse_Bit_Order (Full_View (Parent_Base)));
7338 Set_OK_To_Reorder_Components
7339 (Derived_Type, OK_To_Reorder_Components (Parent_Base));
7340 Set_Reverse_Bit_Order
7341 (Derived_Type, Reverse_Bit_Order (Parent_Base));
7345 -- Direct controlled types do not inherit Finalize_Storage_Only flag
7347 if not Is_Controlled (Parent_Type) then
7348 Set_Finalize_Storage_Only
7349 (Derived_Type, Finalize_Storage_Only (Parent_Type));
7352 -- Set fields for private derived types
7354 if Is_Private_Type (Derived_Type) then
7355 Set_Depends_On_Private (Derived_Type, True);
7356 Set_Private_Dependents (Derived_Type, New_Elmt_List);
7358 -- Inherit fields from non private record types. If this is the
7359 -- completion of a derivation from a private type, the parent itself
7360 -- is private, and the attributes come from its full view, which must
7364 if Is_Private_Type (Parent_Base)
7365 and then not Is_Record_Type (Parent_Base)
7367 Set_Component_Alignment
7368 (Derived_Type, Component_Alignment (Full_View (Parent_Base)));
7370 (Derived_Type, C_Pass_By_Copy (Full_View (Parent_Base)));
7372 Set_Component_Alignment
7373 (Derived_Type, Component_Alignment (Parent_Base));
7375 (Derived_Type, C_Pass_By_Copy (Parent_Base));
7379 -- Set fields for tagged types
7382 Set_Direct_Primitive_Operations (Derived_Type, New_Elmt_List);
7384 -- All tagged types defined in Ada.Finalization are controlled
7386 if Chars (Scope (Derived_Type)) = Name_Finalization
7387 and then Chars (Scope (Scope (Derived_Type))) = Name_Ada
7388 and then Scope (Scope (Scope (Derived_Type))) = Standard_Standard
7390 Set_Is_Controlled (Derived_Type);
7392 Set_Is_Controlled (Derived_Type, Is_Controlled (Parent_Base));
7395 -- Minor optimization: there is no need to generate the class-wide
7396 -- entity associated with an underlying record view.
7398 if not Is_Underlying_Record_View (Derived_Type) then
7399 Make_Class_Wide_Type (Derived_Type);
7402 Set_Is_Abstract_Type (Derived_Type, Abstract_Present (Type_Def));
7404 if Has_Discriminants (Derived_Type)
7405 and then Constraint_Present
7407 Set_Stored_Constraint
7408 (Derived_Type, Expand_To_Stored_Constraint (Parent_Base, Discs));
7411 if Ada_Version >= Ada_2005 then
7413 Ifaces_List : Elist_Id;
7416 -- Checks rules 3.9.4 (13/2 and 14/2)
7418 if Comes_From_Source (Derived_Type)
7419 and then not Is_Private_Type (Derived_Type)
7420 and then Is_Interface (Parent_Type)
7421 and then not Is_Interface (Derived_Type)
7423 if Is_Task_Interface (Parent_Type) then
7425 ("(Ada 2005) task type required (RM 3.9.4 (13.2))",
7428 elsif Is_Protected_Interface (Parent_Type) then
7430 ("(Ada 2005) protected type required (RM 3.9.4 (14.2))",
7435 -- Check ARM rules 3.9.4 (15/2), 9.1 (9.d/2) and 9.4 (11.d/2)
7437 Check_Interfaces (N, Type_Def);
7439 -- Ada 2005 (AI-251): Collect the list of progenitors that are
7440 -- not already in the parents.
7444 Ifaces_List => Ifaces_List,
7445 Exclude_Parents => True);
7447 Set_Interfaces (Derived_Type, Ifaces_List);
7449 -- If the derived type is the anonymous type created for
7450 -- a declaration whose parent has a constraint, propagate
7451 -- the interface list to the source type. This must be done
7452 -- prior to the completion of the analysis of the source type
7453 -- because the components in the extension may contain current
7454 -- instances whose legality depends on some ancestor.
7456 if Is_Itype (Derived_Type) then
7458 Def : constant Node_Id :=
7459 Associated_Node_For_Itype (Derived_Type);
7462 and then Nkind (Def) = N_Full_Type_Declaration
7465 (Defining_Identifier (Def), Ifaces_List);
7473 Set_Is_Packed (Derived_Type, Is_Packed (Parent_Base));
7474 Set_Has_Non_Standard_Rep
7475 (Derived_Type, Has_Non_Standard_Rep (Parent_Base));
7478 -- STEP 4: Inherit components from the parent base and constrain them.
7479 -- Apply the second transformation described in point 6. above.
7481 if (not Is_Empty_Elmt_List (Discs) or else Inherit_Discrims)
7482 or else not Has_Discriminants (Parent_Type)
7483 or else not Is_Constrained (Parent_Type)
7487 Constrs := Discriminant_Constraint (Parent_Type);
7492 (N, Parent_Base, Derived_Type, Is_Tagged, Inherit_Discrims, Constrs);
7494 -- STEP 5a: Copy the parent record declaration for untagged types
7496 if not Is_Tagged then
7498 -- Discriminant_Constraint (Derived_Type) has been properly
7499 -- constructed. Save it and temporarily set it to Empty because we
7500 -- do not want the call to New_Copy_Tree below to mess this list.
7502 if Has_Discriminants (Derived_Type) then
7503 Save_Discr_Constr := Discriminant_Constraint (Derived_Type);
7504 Set_Discriminant_Constraint (Derived_Type, No_Elist);
7506 Save_Discr_Constr := No_Elist;
7509 -- Save the Etype field of Derived_Type. It is correctly set now,
7510 -- but the call to New_Copy tree may remap it to point to itself,
7511 -- which is not what we want. Ditto for the Next_Entity field.
7513 Save_Etype := Etype (Derived_Type);
7514 Save_Next_Entity := Next_Entity (Derived_Type);
7516 -- Assoc_List maps all stored discriminants in the Parent_Base to
7517 -- stored discriminants in the Derived_Type. It is fundamental that
7518 -- no types or itypes with discriminants other than the stored
7519 -- discriminants appear in the entities declared inside
7520 -- Derived_Type, since the back end cannot deal with it.
7524 (Parent (Parent_Base), Map => Assoc_List, New_Sloc => Loc);
7526 -- Restore the fields saved prior to the New_Copy_Tree call
7527 -- and compute the stored constraint.
7529 Set_Etype (Derived_Type, Save_Etype);
7530 Set_Next_Entity (Derived_Type, Save_Next_Entity);
7532 if Has_Discriminants (Derived_Type) then
7533 Set_Discriminant_Constraint
7534 (Derived_Type, Save_Discr_Constr);
7535 Set_Stored_Constraint
7536 (Derived_Type, Expand_To_Stored_Constraint (Parent_Type, Discs));
7537 Replace_Components (Derived_Type, New_Decl);
7540 -- Insert the new derived type declaration
7542 Rewrite (N, New_Decl);
7544 -- STEP 5b: Complete the processing for record extensions in generics
7546 -- There is no completion for record extensions declared in the
7547 -- parameter part of a generic, so we need to complete processing for
7548 -- these generic record extensions here. The Record_Type_Definition call
7549 -- will change the Ekind of the components from E_Void to E_Component.
7551 elsif Private_Extension and then Is_Generic_Type (Derived_Type) then
7552 Record_Type_Definition (Empty, Derived_Type);
7554 -- STEP 5c: Process the record extension for non private tagged types
7556 elsif not Private_Extension then
7558 -- Add the _parent field in the derived type
7560 Expand_Record_Extension (Derived_Type, Type_Def);
7562 -- Ada 2005 (AI-251): Addition of the Tag corresponding to all the
7563 -- implemented interfaces if we are in expansion mode
7566 and then Has_Interfaces (Derived_Type)
7568 Add_Interface_Tag_Components (N, Derived_Type);
7571 -- Analyze the record extension
7573 Record_Type_Definition
7574 (Record_Extension_Part (Type_Def), Derived_Type);
7579 -- Nothing else to do if there is an error in the derivation.
7580 -- An unusual case: the full view may be derived from a type in an
7581 -- instance, when the partial view was used illegally as an actual
7582 -- in that instance, leading to a circular definition.
7584 if Etype (Derived_Type) = Any_Type
7585 or else Etype (Parent_Type) = Derived_Type
7590 -- Set delayed freeze and then derive subprograms, we need to do
7591 -- this in this order so that derived subprograms inherit the
7592 -- derived freeze if necessary.
7594 Set_Has_Delayed_Freeze (Derived_Type);
7596 if Derive_Subps then
7597 Derive_Subprograms (Parent_Type, Derived_Type);
7600 -- If we have a private extension which defines a constrained derived
7601 -- type mark as constrained here after we have derived subprograms. See
7602 -- comment on point 9. just above the body of Build_Derived_Record_Type.
7604 if Private_Extension and then Inherit_Discrims then
7605 if Constraint_Present and then not Is_Empty_Elmt_List (Discs) then
7606 Set_Is_Constrained (Derived_Type, True);
7607 Set_Discriminant_Constraint (Derived_Type, Discs);
7609 elsif Is_Constrained (Parent_Type) then
7611 (Derived_Type, True);
7612 Set_Discriminant_Constraint
7613 (Derived_Type, Discriminant_Constraint (Parent_Type));
7617 -- Update the class-wide type, which shares the now-completed entity
7618 -- list with its specific type. In case of underlying record views,
7619 -- we do not generate the corresponding class wide entity.
7622 and then not Is_Underlying_Record_View (Derived_Type)
7625 (Class_Wide_Type (Derived_Type), First_Entity (Derived_Type));
7627 (Class_Wide_Type (Derived_Type), Last_Entity (Derived_Type));
7630 -- Update the scope of anonymous access types of discriminants and other
7631 -- components, to prevent scope anomalies in gigi, when the derivation
7632 -- appears in a scope nested within that of the parent.
7638 D := First_Entity (Derived_Type);
7639 while Present (D) loop
7640 if Ekind_In (D, E_Discriminant, E_Component) then
7641 if Is_Itype (Etype (D))
7642 and then Ekind (Etype (D)) = E_Anonymous_Access_Type
7644 Set_Scope (Etype (D), Current_Scope);
7651 end Build_Derived_Record_Type;
7653 ------------------------
7654 -- Build_Derived_Type --
7655 ------------------------
7657 procedure Build_Derived_Type
7659 Parent_Type : Entity_Id;
7660 Derived_Type : Entity_Id;
7661 Is_Completion : Boolean;
7662 Derive_Subps : Boolean := True)
7664 Parent_Base : constant Entity_Id := Base_Type (Parent_Type);
7667 -- Set common attributes
7669 Set_Scope (Derived_Type, Current_Scope);
7671 Set_Ekind (Derived_Type, Ekind (Parent_Base));
7672 Set_Etype (Derived_Type, Parent_Base);
7673 Set_Has_Task (Derived_Type, Has_Task (Parent_Base));
7675 Set_Size_Info (Derived_Type, Parent_Type);
7676 Set_RM_Size (Derived_Type, RM_Size (Parent_Type));
7677 Set_Convention (Derived_Type, Convention (Parent_Type));
7678 Set_Is_Controlled (Derived_Type, Is_Controlled (Parent_Type));
7679 Set_Is_Tagged_Type (Derived_Type, Is_Tagged_Type (Parent_Type));
7681 -- Propagate invariant information. The new type has invariants if
7682 -- they are inherited from the parent type, and these invariants can
7683 -- be further inherited, so both flags are set.
7685 if Has_Inheritable_Invariants (Parent_Type) then
7686 Set_Has_Inheritable_Invariants (Derived_Type);
7687 Set_Has_Invariants (Derived_Type);
7690 -- We similarly inherit predicates
7692 if Has_Predicates (Parent_Type) then
7693 Set_Has_Predicates (Derived_Type);
7696 -- The derived type inherits the representation clauses of the parent.
7697 -- However, for a private type that is completed by a derivation, there
7698 -- may be operation attributes that have been specified already (stream
7699 -- attributes and External_Tag) and those must be provided. Finally,
7700 -- if the partial view is a private extension, the representation items
7701 -- of the parent have been inherited already, and should not be chained
7702 -- twice to the derived type.
7704 if Is_Tagged_Type (Parent_Type)
7705 and then Present (First_Rep_Item (Derived_Type))
7707 -- The existing items are either operational items or items inherited
7708 -- from a private extension declaration.
7712 -- Used to iterate over representation items of the derived type
7715 -- Last representation item of the (non-empty) representation
7716 -- item list of the derived type.
7718 Found : Boolean := False;
7721 Rep := First_Rep_Item (Derived_Type);
7723 while Present (Rep) loop
7724 if Rep = First_Rep_Item (Parent_Type) then
7729 Rep := Next_Rep_Item (Rep);
7731 if Present (Rep) then
7737 -- Here if we either encountered the parent type's first rep
7738 -- item on the derived type's rep item list (in which case
7739 -- Found is True, and we have nothing else to do), or if we
7740 -- reached the last rep item of the derived type, which is
7741 -- Last_Rep, in which case we further chain the parent type's
7742 -- rep items to those of the derived type.
7745 Set_Next_Rep_Item (Last_Rep, First_Rep_Item (Parent_Type));
7750 Set_First_Rep_Item (Derived_Type, First_Rep_Item (Parent_Type));
7753 case Ekind (Parent_Type) is
7754 when Numeric_Kind =>
7755 Build_Derived_Numeric_Type (N, Parent_Type, Derived_Type);
7758 Build_Derived_Array_Type (N, Parent_Type, Derived_Type);
7762 | Class_Wide_Kind =>
7763 Build_Derived_Record_Type
7764 (N, Parent_Type, Derived_Type, Derive_Subps);
7767 when Enumeration_Kind =>
7768 Build_Derived_Enumeration_Type (N, Parent_Type, Derived_Type);
7771 Build_Derived_Access_Type (N, Parent_Type, Derived_Type);
7773 when Incomplete_Or_Private_Kind =>
7774 Build_Derived_Private_Type
7775 (N, Parent_Type, Derived_Type, Is_Completion, Derive_Subps);
7777 -- For discriminated types, the derivation includes deriving
7778 -- primitive operations. For others it is done below.
7780 if Is_Tagged_Type (Parent_Type)
7781 or else Has_Discriminants (Parent_Type)
7782 or else (Present (Full_View (Parent_Type))
7783 and then Has_Discriminants (Full_View (Parent_Type)))
7788 when Concurrent_Kind =>
7789 Build_Derived_Concurrent_Type (N, Parent_Type, Derived_Type);
7792 raise Program_Error;
7795 if Etype (Derived_Type) = Any_Type then
7799 -- Set delayed freeze and then derive subprograms, we need to do this
7800 -- in this order so that derived subprograms inherit the derived freeze
7803 Set_Has_Delayed_Freeze (Derived_Type);
7804 if Derive_Subps then
7805 Derive_Subprograms (Parent_Type, Derived_Type);
7808 Set_Has_Primitive_Operations
7809 (Base_Type (Derived_Type), Has_Primitive_Operations (Parent_Type));
7810 end Build_Derived_Type;
7812 -----------------------
7813 -- Build_Discriminal --
7814 -----------------------
7816 procedure Build_Discriminal (Discrim : Entity_Id) is
7817 D_Minal : Entity_Id;
7818 CR_Disc : Entity_Id;
7821 -- A discriminal has the same name as the discriminant
7824 Make_Defining_Identifier (Sloc (Discrim),
7825 Chars => Chars (Discrim));
7827 Set_Ekind (D_Minal, E_In_Parameter);
7828 Set_Mechanism (D_Minal, Default_Mechanism);
7829 Set_Etype (D_Minal, Etype (Discrim));
7830 Set_Scope (D_Minal, Current_Scope);
7832 Set_Discriminal (Discrim, D_Minal);
7833 Set_Discriminal_Link (D_Minal, Discrim);
7835 -- For task types, build at once the discriminants of the corresponding
7836 -- record, which are needed if discriminants are used in entry defaults
7837 -- and in family bounds.
7839 if Is_Concurrent_Type (Current_Scope)
7840 or else Is_Limited_Type (Current_Scope)
7842 CR_Disc := Make_Defining_Identifier (Sloc (Discrim), Chars (Discrim));
7844 Set_Ekind (CR_Disc, E_In_Parameter);
7845 Set_Mechanism (CR_Disc, Default_Mechanism);
7846 Set_Etype (CR_Disc, Etype (Discrim));
7847 Set_Scope (CR_Disc, Current_Scope);
7848 Set_Discriminal_Link (CR_Disc, Discrim);
7849 Set_CR_Discriminant (Discrim, CR_Disc);
7851 end Build_Discriminal;
7853 ------------------------------------
7854 -- Build_Discriminant_Constraints --
7855 ------------------------------------
7857 function Build_Discriminant_Constraints
7860 Derived_Def : Boolean := False) return Elist_Id
7862 C : constant Node_Id := Constraint (Def);
7863 Nb_Discr : constant Nat := Number_Discriminants (T);
7865 Discr_Expr : array (1 .. Nb_Discr) of Node_Id := (others => Empty);
7866 -- Saves the expression corresponding to a given discriminant in T
7868 function Pos_Of_Discr (T : Entity_Id; D : Entity_Id) return Nat;
7869 -- Return the Position number within array Discr_Expr of a discriminant
7870 -- D within the discriminant list of the discriminated type T.
7876 function Pos_Of_Discr (T : Entity_Id; D : Entity_Id) return Nat is
7880 Disc := First_Discriminant (T);
7881 for J in Discr_Expr'Range loop
7886 Next_Discriminant (Disc);
7889 -- Note: Since this function is called on discriminants that are
7890 -- known to belong to the discriminated type, falling through the
7891 -- loop with no match signals an internal compiler error.
7893 raise Program_Error;
7896 -- Declarations local to Build_Discriminant_Constraints
7900 Elist : constant Elist_Id := New_Elmt_List;
7908 Discrim_Present : Boolean := False;
7910 -- Start of processing for Build_Discriminant_Constraints
7913 -- The following loop will process positional associations only.
7914 -- For a positional association, the (single) discriminant is
7915 -- implicitly specified by position, in textual order (RM 3.7.2).
7917 Discr := First_Discriminant (T);
7918 Constr := First (Constraints (C));
7919 for D in Discr_Expr'Range loop
7920 exit when Nkind (Constr) = N_Discriminant_Association;
7923 Error_Msg_N ("too few discriminants given in constraint", C);
7924 return New_Elmt_List;
7926 elsif Nkind (Constr) = N_Range
7927 or else (Nkind (Constr) = N_Attribute_Reference
7929 Attribute_Name (Constr) = Name_Range)
7932 ("a range is not a valid discriminant constraint", Constr);
7933 Discr_Expr (D) := Error;
7936 Analyze_And_Resolve (Constr, Base_Type (Etype (Discr)));
7937 Discr_Expr (D) := Constr;
7940 Next_Discriminant (Discr);
7944 if No (Discr) and then Present (Constr) then
7945 Error_Msg_N ("too many discriminants given in constraint", Constr);
7946 return New_Elmt_List;
7949 -- Named associations can be given in any order, but if both positional
7950 -- and named associations are used in the same discriminant constraint,
7951 -- then positional associations must occur first, at their normal
7952 -- position. Hence once a named association is used, the rest of the
7953 -- discriminant constraint must use only named associations.
7955 while Present (Constr) loop
7957 -- Positional association forbidden after a named association
7959 if Nkind (Constr) /= N_Discriminant_Association then
7960 Error_Msg_N ("positional association follows named one", Constr);
7961 return New_Elmt_List;
7963 -- Otherwise it is a named association
7966 -- E records the type of the discriminants in the named
7967 -- association. All the discriminants specified in the same name
7968 -- association must have the same type.
7972 -- Search the list of discriminants in T to see if the simple name
7973 -- given in the constraint matches any of them.
7975 Id := First (Selector_Names (Constr));
7976 while Present (Id) loop
7979 -- If Original_Discriminant is present, we are processing a
7980 -- generic instantiation and this is an instance node. We need
7981 -- to find the name of the corresponding discriminant in the
7982 -- actual record type T and not the name of the discriminant in
7983 -- the generic formal. Example:
7986 -- type G (D : int) is private;
7988 -- subtype W is G (D => 1);
7990 -- type Rec (X : int) is record ... end record;
7991 -- package Q is new P (G => Rec);
7993 -- At the point of the instantiation, formal type G is Rec
7994 -- and therefore when reanalyzing "subtype W is G (D => 1);"
7995 -- which really looks like "subtype W is Rec (D => 1);" at
7996 -- the point of instantiation, we want to find the discriminant
7997 -- that corresponds to D in Rec, i.e. X.
7999 if Present (Original_Discriminant (Id)) then
8000 Discr := Find_Corresponding_Discriminant (Id, T);
8004 Discr := First_Discriminant (T);
8005 while Present (Discr) loop
8006 if Chars (Discr) = Chars (Id) then
8011 Next_Discriminant (Discr);
8015 Error_Msg_N ("& does not match any discriminant", Id);
8016 return New_Elmt_List;
8018 -- The following is only useful for the benefit of generic
8019 -- instances but it does not interfere with other
8020 -- processing for the non-generic case so we do it in all
8021 -- cases (for generics this statement is executed when
8022 -- processing the generic definition, see comment at the
8023 -- beginning of this if statement).
8026 Set_Original_Discriminant (Id, Discr);
8030 Position := Pos_Of_Discr (T, Discr);
8032 if Present (Discr_Expr (Position)) then
8033 Error_Msg_N ("duplicate constraint for discriminant&", Id);
8036 -- Each discriminant specified in the same named association
8037 -- must be associated with a separate copy of the
8038 -- corresponding expression.
8040 if Present (Next (Id)) then
8041 Expr := New_Copy_Tree (Expression (Constr));
8042 Set_Parent (Expr, Parent (Expression (Constr)));
8044 Expr := Expression (Constr);
8047 Discr_Expr (Position) := Expr;
8048 Analyze_And_Resolve (Expr, Base_Type (Etype (Discr)));
8051 -- A discriminant association with more than one discriminant
8052 -- name is only allowed if the named discriminants are all of
8053 -- the same type (RM 3.7.1(8)).
8056 E := Base_Type (Etype (Discr));
8058 elsif Base_Type (Etype (Discr)) /= E then
8060 ("all discriminants in an association " &
8061 "must have the same type", Id);
8071 -- A discriminant constraint must provide exactly one value for each
8072 -- discriminant of the type (RM 3.7.1(8)).
8074 for J in Discr_Expr'Range loop
8075 if No (Discr_Expr (J)) then
8076 Error_Msg_N ("too few discriminants given in constraint", C);
8077 return New_Elmt_List;
8081 -- Determine if there are discriminant expressions in the constraint
8083 for J in Discr_Expr'Range loop
8084 if Denotes_Discriminant
8085 (Discr_Expr (J), Check_Concurrent => True)
8087 Discrim_Present := True;
8091 -- Build an element list consisting of the expressions given in the
8092 -- discriminant constraint and apply the appropriate checks. The list
8093 -- is constructed after resolving any named discriminant associations
8094 -- and therefore the expressions appear in the textual order of the
8097 Discr := First_Discriminant (T);
8098 for J in Discr_Expr'Range loop
8099 if Discr_Expr (J) /= Error then
8100 Append_Elmt (Discr_Expr (J), Elist);
8102 -- If any of the discriminant constraints is given by a
8103 -- discriminant and we are in a derived type declaration we
8104 -- have a discriminant renaming. Establish link between new
8105 -- and old discriminant.
8107 if Denotes_Discriminant (Discr_Expr (J)) then
8109 Set_Corresponding_Discriminant
8110 (Entity (Discr_Expr (J)), Discr);
8113 -- Force the evaluation of non-discriminant expressions.
8114 -- If we have found a discriminant in the constraint 3.4(26)
8115 -- and 3.8(18) demand that no range checks are performed are
8116 -- after evaluation. If the constraint is for a component
8117 -- definition that has a per-object constraint, expressions are
8118 -- evaluated but not checked either. In all other cases perform
8122 if Discrim_Present then
8125 elsif Nkind (Parent (Parent (Def))) = N_Component_Declaration
8127 Has_Per_Object_Constraint
8128 (Defining_Identifier (Parent (Parent (Def))))
8132 elsif Is_Access_Type (Etype (Discr)) then
8133 Apply_Constraint_Check (Discr_Expr (J), Etype (Discr));
8136 Apply_Range_Check (Discr_Expr (J), Etype (Discr));
8139 Force_Evaluation (Discr_Expr (J));
8142 -- Check that the designated type of an access discriminant's
8143 -- expression is not a class-wide type unless the discriminant's
8144 -- designated type is also class-wide.
8146 if Ekind (Etype (Discr)) = E_Anonymous_Access_Type
8147 and then not Is_Class_Wide_Type
8148 (Designated_Type (Etype (Discr)))
8149 and then Etype (Discr_Expr (J)) /= Any_Type
8150 and then Is_Class_Wide_Type
8151 (Designated_Type (Etype (Discr_Expr (J))))
8153 Wrong_Type (Discr_Expr (J), Etype (Discr));
8155 elsif Is_Access_Type (Etype (Discr))
8156 and then not Is_Access_Constant (Etype (Discr))
8157 and then Is_Access_Type (Etype (Discr_Expr (J)))
8158 and then Is_Access_Constant (Etype (Discr_Expr (J)))
8161 ("constraint for discriminant& must be access to variable",
8166 Next_Discriminant (Discr);
8170 end Build_Discriminant_Constraints;
8172 ---------------------------------
8173 -- Build_Discriminated_Subtype --
8174 ---------------------------------
8176 procedure Build_Discriminated_Subtype
8180 Related_Nod : Node_Id;
8181 For_Access : Boolean := False)
8183 Has_Discrs : constant Boolean := Has_Discriminants (T);
8184 Constrained : constant Boolean :=
8186 and then not Is_Empty_Elmt_List (Elist)
8187 and then not Is_Class_Wide_Type (T))
8188 or else Is_Constrained (T);
8191 if Ekind (T) = E_Record_Type then
8193 Set_Ekind (Def_Id, E_Private_Subtype);
8194 Set_Is_For_Access_Subtype (Def_Id, True);
8196 Set_Ekind (Def_Id, E_Record_Subtype);
8199 -- Inherit preelaboration flag from base, for types for which it
8200 -- may have been set: records, private types, protected types.
8202 Set_Known_To_Have_Preelab_Init
8203 (Def_Id, Known_To_Have_Preelab_Init (T));
8205 elsif Ekind (T) = E_Task_Type then
8206 Set_Ekind (Def_Id, E_Task_Subtype);
8208 elsif Ekind (T) = E_Protected_Type then
8209 Set_Ekind (Def_Id, E_Protected_Subtype);
8210 Set_Known_To_Have_Preelab_Init
8211 (Def_Id, Known_To_Have_Preelab_Init (T));
8213 elsif Is_Private_Type (T) then
8214 Set_Ekind (Def_Id, Subtype_Kind (Ekind (T)));
8215 Set_Known_To_Have_Preelab_Init
8216 (Def_Id, Known_To_Have_Preelab_Init (T));
8218 elsif Is_Class_Wide_Type (T) then
8219 Set_Ekind (Def_Id, E_Class_Wide_Subtype);
8222 -- Incomplete type. Attach subtype to list of dependents, to be
8223 -- completed with full view of parent type, unless is it the
8224 -- designated subtype of a record component within an init_proc.
8225 -- This last case arises for a component of an access type whose
8226 -- designated type is incomplete (e.g. a Taft Amendment type).
8227 -- The designated subtype is within an inner scope, and needs no
8228 -- elaboration, because only the access type is needed in the
8229 -- initialization procedure.
8231 Set_Ekind (Def_Id, Ekind (T));
8233 if For_Access and then Within_Init_Proc then
8236 Append_Elmt (Def_Id, Private_Dependents (T));
8240 Set_Etype (Def_Id, T);
8241 Init_Size_Align (Def_Id);
8242 Set_Has_Discriminants (Def_Id, Has_Discrs);
8243 Set_Is_Constrained (Def_Id, Constrained);
8245 Set_First_Entity (Def_Id, First_Entity (T));
8246 Set_Last_Entity (Def_Id, Last_Entity (T));
8248 -- If the subtype is the completion of a private declaration, there may
8249 -- have been representation clauses for the partial view, and they must
8250 -- be preserved. Build_Derived_Type chains the inherited clauses with
8251 -- the ones appearing on the extension. If this comes from a subtype
8252 -- declaration, all clauses are inherited.
8254 if No (First_Rep_Item (Def_Id)) then
8255 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
8258 if Is_Tagged_Type (T) then
8259 Set_Is_Tagged_Type (Def_Id);
8260 Make_Class_Wide_Type (Def_Id);
8263 Set_Stored_Constraint (Def_Id, No_Elist);
8266 Set_Discriminant_Constraint (Def_Id, Elist);
8267 Set_Stored_Constraint_From_Discriminant_Constraint (Def_Id);
8270 if Is_Tagged_Type (T) then
8272 -- Ada 2005 (AI-251): In case of concurrent types we inherit the
8273 -- concurrent record type (which has the list of primitive
8276 if Ada_Version >= Ada_2005
8277 and then Is_Concurrent_Type (T)
8279 Set_Corresponding_Record_Type (Def_Id,
8280 Corresponding_Record_Type (T));
8282 Set_Direct_Primitive_Operations (Def_Id,
8283 Direct_Primitive_Operations (T));
8286 Set_Is_Abstract_Type (Def_Id, Is_Abstract_Type (T));
8289 -- Subtypes introduced by component declarations do not need to be
8290 -- marked as delayed, and do not get freeze nodes, because the semantics
8291 -- verifies that the parents of the subtypes are frozen before the
8292 -- enclosing record is frozen.
8294 if not Is_Type (Scope (Def_Id)) then
8295 Set_Depends_On_Private (Def_Id, Depends_On_Private (T));
8297 if Is_Private_Type (T)
8298 and then Present (Full_View (T))
8300 Conditional_Delay (Def_Id, Full_View (T));
8302 Conditional_Delay (Def_Id, T);
8306 if Is_Record_Type (T) then
8307 Set_Is_Limited_Record (Def_Id, Is_Limited_Record (T));
8310 and then not Is_Empty_Elmt_List (Elist)
8311 and then not For_Access
8313 Create_Constrained_Components (Def_Id, Related_Nod, T, Elist);
8314 elsif not For_Access then
8315 Set_Cloned_Subtype (Def_Id, T);
8318 end Build_Discriminated_Subtype;
8320 ---------------------------
8321 -- Build_Itype_Reference --
8322 ---------------------------
8324 procedure Build_Itype_Reference
8328 IR : constant Node_Id := Make_Itype_Reference (Sloc (Nod));
8330 Set_Itype (IR, Ityp);
8331 Insert_After (Nod, IR);
8332 end Build_Itype_Reference;
8334 ------------------------
8335 -- Build_Scalar_Bound --
8336 ------------------------
8338 function Build_Scalar_Bound
8341 Der_T : Entity_Id) return Node_Id
8343 New_Bound : Entity_Id;
8346 -- Note: not clear why this is needed, how can the original bound
8347 -- be unanalyzed at this point? and if it is, what business do we
8348 -- have messing around with it? and why is the base type of the
8349 -- parent type the right type for the resolution. It probably is
8350 -- not! It is OK for the new bound we are creating, but not for
8351 -- the old one??? Still if it never happens, no problem!
8353 Analyze_And_Resolve (Bound, Base_Type (Par_T));
8355 if Nkind_In (Bound, N_Integer_Literal, N_Real_Literal) then
8356 New_Bound := New_Copy (Bound);
8357 Set_Etype (New_Bound, Der_T);
8358 Set_Analyzed (New_Bound);
8360 elsif Is_Entity_Name (Bound) then
8361 New_Bound := OK_Convert_To (Der_T, New_Copy (Bound));
8363 -- The following is almost certainly wrong. What business do we have
8364 -- relocating a node (Bound) that is presumably still attached to
8365 -- the tree elsewhere???
8368 New_Bound := OK_Convert_To (Der_T, Relocate_Node (Bound));
8371 Set_Etype (New_Bound, Der_T);
8373 end Build_Scalar_Bound;
8375 --------------------------------
8376 -- Build_Underlying_Full_View --
8377 --------------------------------
8379 procedure Build_Underlying_Full_View
8384 Loc : constant Source_Ptr := Sloc (N);
8385 Subt : constant Entity_Id :=
8386 Make_Defining_Identifier
8387 (Loc, New_External_Name (Chars (Typ), 'S'));
8394 procedure Set_Discriminant_Name (Id : Node_Id);
8395 -- If the derived type has discriminants, they may rename discriminants
8396 -- of the parent. When building the full view of the parent, we need to
8397 -- recover the names of the original discriminants if the constraint is
8398 -- given by named associations.
8400 ---------------------------
8401 -- Set_Discriminant_Name --
8402 ---------------------------
8404 procedure Set_Discriminant_Name (Id : Node_Id) is
8408 Set_Original_Discriminant (Id, Empty);
8410 if Has_Discriminants (Typ) then
8411 Disc := First_Discriminant (Typ);
8412 while Present (Disc) loop
8413 if Chars (Disc) = Chars (Id)
8414 and then Present (Corresponding_Discriminant (Disc))
8416 Set_Chars (Id, Chars (Corresponding_Discriminant (Disc)));
8418 Next_Discriminant (Disc);
8421 end Set_Discriminant_Name;
8423 -- Start of processing for Build_Underlying_Full_View
8426 if Nkind (N) = N_Full_Type_Declaration then
8427 Constr := Constraint (Subtype_Indication (Type_Definition (N)));
8429 elsif Nkind (N) = N_Subtype_Declaration then
8430 Constr := New_Copy_Tree (Constraint (Subtype_Indication (N)));
8432 elsif Nkind (N) = N_Component_Declaration then
8435 (Constraint (Subtype_Indication (Component_Definition (N))));
8438 raise Program_Error;
8441 C := First (Constraints (Constr));
8442 while Present (C) loop
8443 if Nkind (C) = N_Discriminant_Association then
8444 Id := First (Selector_Names (C));
8445 while Present (Id) loop
8446 Set_Discriminant_Name (Id);
8455 Make_Subtype_Declaration (Loc,
8456 Defining_Identifier => Subt,
8457 Subtype_Indication =>
8458 Make_Subtype_Indication (Loc,
8459 Subtype_Mark => New_Reference_To (Par, Loc),
8460 Constraint => New_Copy_Tree (Constr)));
8462 -- If this is a component subtype for an outer itype, it is not
8463 -- a list member, so simply set the parent link for analysis: if
8464 -- the enclosing type does not need to be in a declarative list,
8465 -- neither do the components.
8467 if Is_List_Member (N)
8468 and then Nkind (N) /= N_Component_Declaration
8470 Insert_Before (N, Indic);
8472 Set_Parent (Indic, Parent (N));
8476 Set_Underlying_Full_View (Typ, Full_View (Subt));
8477 end Build_Underlying_Full_View;
8479 -------------------------------
8480 -- Check_Abstract_Overriding --
8481 -------------------------------
8483 procedure Check_Abstract_Overriding (T : Entity_Id) is
8484 Alias_Subp : Entity_Id;
8490 procedure Check_Pragma_Implemented (Subp : Entity_Id);
8491 -- Ada 2012 (AI05-0030): Subprogram Subp overrides an interface routine
8492 -- which has pragma Implemented already set. Check whether Subp's entity
8493 -- kind conforms to the implementation kind of the overridden routine.
8495 procedure Check_Pragma_Implemented
8497 Iface_Subp : Entity_Id);
8498 -- Ada 2012 (AI05-0030): Subprogram Subp overrides interface routine
8499 -- Iface_Subp and both entities have pragma Implemented already set on
8500 -- them. Check whether the two implementation kinds are conforming.
8502 procedure Inherit_Pragma_Implemented
8504 Iface_Subp : Entity_Id);
8505 -- Ada 2012 (AI05-0030): Interface primitive Subp overrides interface
8506 -- subprogram Iface_Subp which has been marked by pragma Implemented.
8507 -- Propagate the implementation kind of Iface_Subp to Subp.
8509 ------------------------------
8510 -- Check_Pragma_Implemented --
8511 ------------------------------
8513 procedure Check_Pragma_Implemented (Subp : Entity_Id) is
8514 Iface_Alias : constant Entity_Id := Interface_Alias (Subp);
8515 Impl_Kind : constant Name_Id := Implementation_Kind (Iface_Alias);
8516 Contr_Typ : Entity_Id;
8519 -- Subp must have an alias since it is a hidden entity used to link
8520 -- an interface subprogram to its overriding counterpart.
8522 pragma Assert (Present (Alias (Subp)));
8524 -- Extract the type of the controlling formal
8526 Contr_Typ := Etype (First_Formal (Alias (Subp)));
8528 if Is_Concurrent_Record_Type (Contr_Typ) then
8529 Contr_Typ := Corresponding_Concurrent_Type (Contr_Typ);
8532 -- An interface subprogram whose implementation kind is By_Entry must
8533 -- be implemented by an entry.
8535 if Impl_Kind = Name_By_Entry
8536 and then Ekind (Wrapped_Entity (Alias (Subp))) /= E_Entry
8538 Error_Msg_Node_2 := Iface_Alias;
8540 ("type & must implement abstract subprogram & with an entry",
8541 Alias (Subp), Contr_Typ);
8543 elsif Impl_Kind = Name_By_Protected_Procedure then
8545 -- An interface subprogram whose implementation kind is By_
8546 -- Protected_Procedure cannot be implemented by a primitive
8547 -- procedure of a task type.
8549 if Ekind (Contr_Typ) /= E_Protected_Type then
8550 Error_Msg_Node_2 := Contr_Typ;
8552 ("interface subprogram & cannot be implemented by a " &
8553 "primitive procedure of task type &", Alias (Subp),
8556 -- An interface subprogram whose implementation kind is By_
8557 -- Protected_Procedure must be implemented by a procedure.
8559 elsif Is_Primitive_Wrapper (Alias (Subp))
8560 and then Ekind (Wrapped_Entity (Alias (Subp))) /= E_Procedure
8562 Error_Msg_Node_2 := Iface_Alias;
8564 ("type & must implement abstract subprogram & with a " &
8565 "procedure", Alias (Subp), Contr_Typ);
8568 end Check_Pragma_Implemented;
8570 ------------------------------
8571 -- Check_Pragma_Implemented --
8572 ------------------------------
8574 procedure Check_Pragma_Implemented
8576 Iface_Subp : Entity_Id)
8578 Iface_Kind : constant Name_Id := Implementation_Kind (Iface_Subp);
8579 Subp_Kind : constant Name_Id := Implementation_Kind (Subp);
8582 -- Ada 2012 (AI05-0030): The implementation kinds of an overridden
8583 -- and overriding subprogram are different. In general this is an
8584 -- error except when the implementation kind of the overridden
8585 -- subprograms is By_Any.
8587 if Iface_Kind /= Subp_Kind
8588 and then Iface_Kind /= Name_By_Any
8590 if Iface_Kind = Name_By_Entry then
8592 ("incompatible implementation kind, overridden subprogram " &
8593 "is marked By_Entry", Subp);
8596 ("incompatible implementation kind, overridden subprogram " &
8597 "is marked By_Protected_Procedure", Subp);
8600 end Check_Pragma_Implemented;
8602 --------------------------------
8603 -- Inherit_Pragma_Implemented --
8604 --------------------------------
8606 procedure Inherit_Pragma_Implemented
8608 Iface_Subp : Entity_Id)
8610 Iface_Kind : constant Name_Id := Implementation_Kind (Iface_Subp);
8611 Loc : constant Source_Ptr := Sloc (Subp);
8612 Impl_Prag : Node_Id;
8615 -- Since the implementation kind is stored as a representation item
8616 -- rather than a flag, create a pragma node.
8620 Chars => Name_Implemented,
8621 Pragma_Argument_Associations => New_List (
8622 Make_Pragma_Argument_Association (Loc,
8624 New_Reference_To (Subp, Loc)),
8626 Make_Pragma_Argument_Association (Loc,
8628 Make_Identifier (Loc, Iface_Kind))));
8630 -- The pragma doesn't need to be analyzed because it is internaly
8631 -- build. It is safe to directly register it as a rep item since we
8632 -- are only interested in the characters of the implementation kind.
8634 Record_Rep_Item (Subp, Impl_Prag);
8635 end Inherit_Pragma_Implemented;
8637 -- Start of processing for Check_Abstract_Overriding
8640 Op_List := Primitive_Operations (T);
8642 -- Loop to check primitive operations
8644 Elmt := First_Elmt (Op_List);
8645 while Present (Elmt) loop
8646 Subp := Node (Elmt);
8647 Alias_Subp := Alias (Subp);
8649 -- Inherited subprograms are identified by the fact that they do not
8650 -- come from source, and the associated source location is the
8651 -- location of the first subtype of the derived type.
8653 -- Ada 2005 (AI-228): Apply the rules of RM-3.9.3(6/2) for
8654 -- subprograms that "require overriding".
8656 -- Special exception, do not complain about failure to override the
8657 -- stream routines _Input and _Output, as well as the primitive
8658 -- operations used in dispatching selects since we always provide
8659 -- automatic overridings for these subprograms.
8661 -- Also ignore this rule for convention CIL since .NET libraries
8662 -- do bizarre things with interfaces???
8664 -- The partial view of T may have been a private extension, for
8665 -- which inherited functions dispatching on result are abstract.
8666 -- If the full view is a null extension, there is no need for
8667 -- overriding in Ada2005, but wrappers need to be built for them
8668 -- (see exp_ch3, Build_Controlling_Function_Wrappers).
8670 if Is_Null_Extension (T)
8671 and then Has_Controlling_Result (Subp)
8672 and then Ada_Version >= Ada_2005
8673 and then Present (Alias_Subp)
8674 and then not Comes_From_Source (Subp)
8675 and then not Is_Abstract_Subprogram (Alias_Subp)
8676 and then not Is_Access_Type (Etype (Subp))
8680 -- Ada 2005 (AI-251): Internal entities of interfaces need no
8681 -- processing because this check is done with the aliased
8684 elsif Present (Interface_Alias (Subp)) then
8687 elsif (Is_Abstract_Subprogram (Subp)
8688 or else Requires_Overriding (Subp)
8690 (Has_Controlling_Result (Subp)
8691 and then Present (Alias_Subp)
8692 and then not Comes_From_Source (Subp)
8693 and then Sloc (Subp) = Sloc (First_Subtype (T))))
8694 and then not Is_TSS (Subp, TSS_Stream_Input)
8695 and then not Is_TSS (Subp, TSS_Stream_Output)
8696 and then not Is_Abstract_Type (T)
8697 and then Convention (T) /= Convention_CIL
8698 and then not Is_Predefined_Interface_Primitive (Subp)
8700 -- Ada 2005 (AI-251): Do not consider hidden entities associated
8701 -- with abstract interface types because the check will be done
8702 -- with the aliased entity (otherwise we generate a duplicated
8705 and then not Present (Interface_Alias (Subp))
8707 if Present (Alias_Subp) then
8709 -- Only perform the check for a derived subprogram when the
8710 -- type has an explicit record extension. This avoids incorrect
8711 -- flagging of abstract subprograms for the case of a type
8712 -- without an extension that is derived from a formal type
8713 -- with a tagged actual (can occur within a private part).
8715 -- Ada 2005 (AI-391): In the case of an inherited function with
8716 -- a controlling result of the type, the rule does not apply if
8717 -- the type is a null extension (unless the parent function
8718 -- itself is abstract, in which case the function must still be
8719 -- be overridden). The expander will generate an overriding
8720 -- wrapper function calling the parent subprogram (see
8721 -- Exp_Ch3.Make_Controlling_Wrapper_Functions).
8723 Type_Def := Type_Definition (Parent (T));
8725 if Nkind (Type_Def) = N_Derived_Type_Definition
8726 and then Present (Record_Extension_Part (Type_Def))
8728 (Ada_Version < Ada_2005
8729 or else not Is_Null_Extension (T)
8730 or else Ekind (Subp) = E_Procedure
8731 or else not Has_Controlling_Result (Subp)
8732 or else Is_Abstract_Subprogram (Alias_Subp)
8733 or else Requires_Overriding (Subp)
8734 or else Is_Access_Type (Etype (Subp)))
8736 -- Avoid reporting error in case of abstract predefined
8737 -- primitive inherited from interface type because the
8738 -- body of internally generated predefined primitives
8739 -- of tagged types are generated later by Freeze_Type
8741 if Is_Interface (Root_Type (T))
8742 and then Is_Abstract_Subprogram (Subp)
8743 and then Is_Predefined_Dispatching_Operation (Subp)
8744 and then not Comes_From_Source (Ultimate_Alias (Subp))
8750 ("type must be declared abstract or & overridden",
8753 -- Traverse the whole chain of aliased subprograms to
8754 -- complete the error notification. This is especially
8755 -- useful for traceability of the chain of entities when
8756 -- the subprogram corresponds with an interface
8757 -- subprogram (which may be defined in another package).
8759 if Present (Alias_Subp) then
8765 while Present (Alias (E)) loop
8766 Error_Msg_Sloc := Sloc (E);
8768 ("\& has been inherited #", T, Subp);
8772 Error_Msg_Sloc := Sloc (E);
8774 ("\& has been inherited from subprogram #",
8780 -- Ada 2005 (AI-345): Protected or task type implementing
8781 -- abstract interfaces.
8783 elsif Is_Concurrent_Record_Type (T)
8784 and then Present (Interfaces (T))
8786 -- The controlling formal of Subp must be of mode "out",
8787 -- "in out" or an access-to-variable to be overridden.
8789 -- Error message below needs rewording (remember comma
8790 -- in -gnatj mode) ???
8792 if Ekind (First_Formal (Subp)) = E_In_Parameter
8793 and then Ekind (Subp) /= E_Function
8795 if not Is_Predefined_Dispatching_Operation (Subp) then
8797 ("first formal of & must be of mode `OUT`, " &
8798 "`IN OUT` or access-to-variable", T, Subp);
8800 ("\to be overridden by protected procedure or " &
8801 "entry (RM 9.4(11.9/2))", T);
8804 -- Some other kind of overriding failure
8808 ("interface subprogram & must be overridden",
8811 -- Examine primitive operations of synchronized type,
8812 -- to find homonyms that have the wrong profile.
8819 First_Entity (Corresponding_Concurrent_Type (T));
8820 while Present (Prim) loop
8821 if Chars (Prim) = Chars (Subp) then
8823 ("profile is not type conformant with "
8824 & "prefixed view profile of "
8825 & "inherited operation&", Prim, Subp);
8835 Error_Msg_Node_2 := T;
8837 ("abstract subprogram& not allowed for type&", Subp);
8839 -- Also post unconditional warning on the type (unconditional
8840 -- so that if there are more than one of these cases, we get
8841 -- them all, and not just the first one).
8843 Error_Msg_Node_2 := Subp;
8844 Error_Msg_N ("nonabstract type& has abstract subprogram&!", T);
8848 -- Ada 2012 (AI05-0030): Perform some checks related to pragma
8851 -- Subp is an expander-generated procedure which maps an interface
8852 -- alias to a protected wrapper. The interface alias is flagged by
8853 -- pragma Implemented. Ensure that Subp is a procedure when the
8854 -- implementation kind is By_Protected_Procedure or an entry when
8857 if Ada_Version >= Ada_2012
8858 and then Is_Hidden (Subp)
8859 and then Present (Interface_Alias (Subp))
8860 and then Has_Rep_Pragma (Interface_Alias (Subp), Name_Implemented)
8862 Check_Pragma_Implemented (Subp);
8865 -- Subp is an interface primitive which overrides another interface
8866 -- primitive marked with pragma Implemented.
8868 if Ada_Version >= Ada_2012
8869 and then Is_Overriding_Operation (Subp)
8870 and then Present (Overridden_Operation (Subp))
8871 and then Has_Rep_Pragma
8872 (Overridden_Operation (Subp), Name_Implemented)
8874 -- If the overriding routine is also marked by Implemented, check
8875 -- that the two implementation kinds are conforming.
8877 if Has_Rep_Pragma (Subp, Name_Implemented) then
8878 Check_Pragma_Implemented
8880 Iface_Subp => Overridden_Operation (Subp));
8882 -- Otherwise the overriding routine inherits the implementation
8883 -- kind from the overridden subprogram.
8886 Inherit_Pragma_Implemented
8888 Iface_Subp => Overridden_Operation (Subp));
8894 end Check_Abstract_Overriding;
8896 ------------------------------------------------
8897 -- Check_Access_Discriminant_Requires_Limited --
8898 ------------------------------------------------
8900 procedure Check_Access_Discriminant_Requires_Limited
8905 -- A discriminant_specification for an access discriminant shall appear
8906 -- only in the declaration for a task or protected type, or for a type
8907 -- with the reserved word 'limited' in its definition or in one of its
8908 -- ancestors (RM 3.7(10)).
8910 -- AI-0063: The proper condition is that type must be immutably limited,
8911 -- or else be a partial view.
8913 if Nkind (Discriminant_Type (D)) = N_Access_Definition then
8914 if Is_Immutably_Limited_Type (Current_Scope)
8916 (Nkind (Parent (Current_Scope)) = N_Private_Type_Declaration
8917 and then Limited_Present (Parent (Current_Scope)))
8923 ("access discriminants allowed only for limited types", Loc);
8926 end Check_Access_Discriminant_Requires_Limited;
8928 -----------------------------------
8929 -- Check_Aliased_Component_Types --
8930 -----------------------------------
8932 procedure Check_Aliased_Component_Types (T : Entity_Id) is
8936 -- ??? Also need to check components of record extensions, but not
8937 -- components of protected types (which are always limited).
8939 -- Ada 2005: AI-363 relaxes this rule, to allow heap objects of such
8940 -- types to be unconstrained. This is safe because it is illegal to
8941 -- create access subtypes to such types with explicit discriminant
8944 if not Is_Limited_Type (T) then
8945 if Ekind (T) = E_Record_Type then
8946 C := First_Component (T);
8947 while Present (C) loop
8949 and then Has_Discriminants (Etype (C))
8950 and then not Is_Constrained (Etype (C))
8951 and then not In_Instance_Body
8952 and then Ada_Version < Ada_2005
8955 ("aliased component must be constrained (RM 3.6(11))",
8962 elsif Ekind (T) = E_Array_Type then
8963 if Has_Aliased_Components (T)
8964 and then Has_Discriminants (Component_Type (T))
8965 and then not Is_Constrained (Component_Type (T))
8966 and then not In_Instance_Body
8967 and then Ada_Version < Ada_2005
8970 ("aliased component type must be constrained (RM 3.6(11))",
8975 end Check_Aliased_Component_Types;
8977 ----------------------
8978 -- Check_Completion --
8979 ----------------------
8981 procedure Check_Completion (Body_Id : Node_Id := Empty) is
8984 procedure Post_Error;
8985 -- Post error message for lack of completion for entity E
8991 procedure Post_Error is
8993 procedure Missing_Body;
8994 -- Output missing body message
9000 procedure Missing_Body is
9002 -- Spec is in same unit, so we can post on spec
9004 if In_Same_Source_Unit (Body_Id, E) then
9005 Error_Msg_N ("missing body for &", E);
9007 -- Spec is in a separate unit, so we have to post on the body
9010 Error_Msg_NE ("missing body for & declared#!", Body_Id, E);
9014 -- Start of processing for Post_Error
9017 if not Comes_From_Source (E) then
9019 if Ekind_In (E, E_Task_Type, E_Protected_Type) then
9020 -- It may be an anonymous protected type created for a
9021 -- single variable. Post error on variable, if present.
9027 Var := First_Entity (Current_Scope);
9028 while Present (Var) loop
9029 exit when Etype (Var) = E
9030 and then Comes_From_Source (Var);
9035 if Present (Var) then
9042 -- If a generated entity has no completion, then either previous
9043 -- semantic errors have disabled the expansion phase, or else we had
9044 -- missing subunits, or else we are compiling without expansion,
9045 -- or else something is very wrong.
9047 if not Comes_From_Source (E) then
9049 (Serious_Errors_Detected > 0
9050 or else Configurable_Run_Time_Violations > 0
9051 or else Subunits_Missing
9052 or else not Expander_Active);
9055 -- Here for source entity
9058 -- Here if no body to post the error message, so we post the error
9059 -- on the declaration that has no completion. This is not really
9060 -- the right place to post it, think about this later ???
9062 if No (Body_Id) then
9065 ("missing full declaration for }", Parent (E), E);
9067 Error_Msg_NE ("missing body for &", Parent (E), E);
9070 -- Package body has no completion for a declaration that appears
9071 -- in the corresponding spec. Post error on the body, with a
9072 -- reference to the non-completed declaration.
9075 Error_Msg_Sloc := Sloc (E);
9078 Error_Msg_NE ("missing full declaration for }!", Body_Id, E);
9080 elsif Is_Overloadable (E)
9081 and then Current_Entity_In_Scope (E) /= E
9083 -- It may be that the completion is mistyped and appears as
9084 -- a distinct overloading of the entity.
9087 Candidate : constant Entity_Id :=
9088 Current_Entity_In_Scope (E);
9089 Decl : constant Node_Id :=
9090 Unit_Declaration_Node (Candidate);
9093 if Is_Overloadable (Candidate)
9094 and then Ekind (Candidate) = Ekind (E)
9095 and then Nkind (Decl) = N_Subprogram_Body
9096 and then Acts_As_Spec (Decl)
9098 Check_Type_Conformant (Candidate, E);
9112 -- Start of processing for Check_Completion
9115 E := First_Entity (Current_Scope);
9116 while Present (E) loop
9117 if Is_Intrinsic_Subprogram (E) then
9120 -- The following situation requires special handling: a child unit
9121 -- that appears in the context clause of the body of its parent:
9123 -- procedure Parent.Child (...);
9125 -- with Parent.Child;
9126 -- package body Parent is
9128 -- Here Parent.Child appears as a local entity, but should not be
9129 -- flagged as requiring completion, because it is a compilation
9132 -- Ignore missing completion for a subprogram that does not come from
9133 -- source (including the _Call primitive operation of RAS types,
9134 -- which has to have the flag Comes_From_Source for other purposes):
9135 -- we assume that the expander will provide the missing completion.
9136 -- In case of previous errors, other expansion actions that provide
9137 -- bodies for null procedures with not be invoked, so inhibit message
9139 -- Note that E_Operator is not in the list that follows, because
9140 -- this kind is reserved for predefined operators, that are
9141 -- intrinsic and do not need completion.
9143 elsif Ekind (E) = E_Function
9144 or else Ekind (E) = E_Procedure
9145 or else Ekind (E) = E_Generic_Function
9146 or else Ekind (E) = E_Generic_Procedure
9148 if Has_Completion (E) then
9151 elsif Is_Subprogram (E) and then Is_Abstract_Subprogram (E) then
9154 elsif Is_Subprogram (E)
9155 and then (not Comes_From_Source (E)
9156 or else Chars (E) = Name_uCall)
9161 Nkind (Parent (Unit_Declaration_Node (E))) = N_Compilation_Unit
9165 elsif Nkind (Parent (E)) = N_Procedure_Specification
9166 and then Null_Present (Parent (E))
9167 and then Serious_Errors_Detected > 0
9175 elsif Is_Entry (E) then
9176 if not Has_Completion (E) and then
9177 (Ekind (Scope (E)) = E_Protected_Object
9178 or else Ekind (Scope (E)) = E_Protected_Type)
9183 elsif Is_Package_Or_Generic_Package (E) then
9184 if Unit_Requires_Body (E) then
9185 if not Has_Completion (E)
9186 and then Nkind (Parent (Unit_Declaration_Node (E))) /=
9192 elsif not Is_Child_Unit (E) then
9193 May_Need_Implicit_Body (E);
9196 elsif Ekind (E) = E_Incomplete_Type
9197 and then No (Underlying_Type (E))
9201 elsif (Ekind (E) = E_Task_Type or else
9202 Ekind (E) = E_Protected_Type)
9203 and then not Has_Completion (E)
9207 -- A single task declared in the current scope is a constant, verify
9208 -- that the body of its anonymous type is in the same scope. If the
9209 -- task is defined elsewhere, this may be a renaming declaration for
9210 -- which no completion is needed.
9212 elsif Ekind (E) = E_Constant
9213 and then Ekind (Etype (E)) = E_Task_Type
9214 and then not Has_Completion (Etype (E))
9215 and then Scope (Etype (E)) = Current_Scope
9219 elsif Ekind (E) = E_Protected_Object
9220 and then not Has_Completion (Etype (E))
9224 elsif Ekind (E) = E_Record_Type then
9225 if Is_Tagged_Type (E) then
9226 Check_Abstract_Overriding (E);
9227 Check_Conventions (E);
9230 Check_Aliased_Component_Types (E);
9232 elsif Ekind (E) = E_Array_Type then
9233 Check_Aliased_Component_Types (E);
9239 end Check_Completion;
9241 ----------------------------
9242 -- Check_Delta_Expression --
9243 ----------------------------
9245 procedure Check_Delta_Expression (E : Node_Id) is
9247 if not (Is_Real_Type (Etype (E))) then
9248 Wrong_Type (E, Any_Real);
9250 elsif not Is_OK_Static_Expression (E) then
9251 Flag_Non_Static_Expr
9252 ("non-static expression used for delta value!", E);
9254 elsif not UR_Is_Positive (Expr_Value_R (E)) then
9255 Error_Msg_N ("delta expression must be positive", E);
9261 -- If any of above errors occurred, then replace the incorrect
9262 -- expression by the real 0.1, which should prevent further errors.
9265 Make_Real_Literal (Sloc (E), Ureal_Tenth));
9266 Analyze_And_Resolve (E, Standard_Float);
9267 end Check_Delta_Expression;
9269 -----------------------------
9270 -- Check_Digits_Expression --
9271 -----------------------------
9273 procedure Check_Digits_Expression (E : Node_Id) is
9275 if not (Is_Integer_Type (Etype (E))) then
9276 Wrong_Type (E, Any_Integer);
9278 elsif not Is_OK_Static_Expression (E) then
9279 Flag_Non_Static_Expr
9280 ("non-static expression used for digits value!", E);
9282 elsif Expr_Value (E) <= 0 then
9283 Error_Msg_N ("digits value must be greater than zero", E);
9289 -- If any of above errors occurred, then replace the incorrect
9290 -- expression by the integer 1, which should prevent further errors.
9292 Rewrite (E, Make_Integer_Literal (Sloc (E), 1));
9293 Analyze_And_Resolve (E, Standard_Integer);
9295 end Check_Digits_Expression;
9297 --------------------------
9298 -- Check_Initialization --
9299 --------------------------
9301 procedure Check_Initialization (T : Entity_Id; Exp : Node_Id) is
9303 if Is_Limited_Type (T)
9304 and then not In_Instance
9305 and then not In_Inlined_Body
9307 if not OK_For_Limited_Init (T, Exp) then
9309 -- In GNAT mode, this is just a warning, to allow it to be evilly
9310 -- turned off. Otherwise it is a real error.
9314 ("?cannot initialize entities of limited type!", Exp);
9316 elsif Ada_Version < Ada_2005 then
9318 ("cannot initialize entities of limited type", Exp);
9319 Explain_Limited_Type (T, Exp);
9322 -- Specialize error message according to kind of illegal
9323 -- initial expression.
9325 if Nkind (Exp) = N_Type_Conversion
9326 and then Nkind (Expression (Exp)) = N_Function_Call
9329 ("illegal context for call"
9330 & " to function with limited result", Exp);
9334 ("initialization of limited object requires aggregate "
9335 & "or function call", Exp);
9340 end Check_Initialization;
9342 ----------------------
9343 -- Check_Interfaces --
9344 ----------------------
9346 procedure Check_Interfaces (N : Node_Id; Def : Node_Id) is
9347 Parent_Type : constant Entity_Id := Etype (Defining_Identifier (N));
9350 Iface_Def : Node_Id;
9351 Iface_Typ : Entity_Id;
9352 Parent_Node : Node_Id;
9354 Is_Task : Boolean := False;
9355 -- Set True if parent type or any progenitor is a task interface
9357 Is_Protected : Boolean := False;
9358 -- Set True if parent type or any progenitor is a protected interface
9360 procedure Check_Ifaces (Iface_Def : Node_Id; Error_Node : Node_Id);
9361 -- Check that a progenitor is compatible with declaration.
9362 -- Error is posted on Error_Node.
9368 procedure Check_Ifaces (Iface_Def : Node_Id; Error_Node : Node_Id) is
9369 Iface_Id : constant Entity_Id :=
9370 Defining_Identifier (Parent (Iface_Def));
9374 if Nkind (N) = N_Private_Extension_Declaration then
9377 Type_Def := Type_Definition (N);
9380 if Is_Task_Interface (Iface_Id) then
9383 elsif Is_Protected_Interface (Iface_Id) then
9384 Is_Protected := True;
9387 if Is_Synchronized_Interface (Iface_Id) then
9389 -- A consequence of 3.9.4 (6/2) and 7.3 (7.2/2) is that a private
9390 -- extension derived from a synchronized interface must explicitly
9391 -- be declared synchronized, because the full view will be a
9392 -- synchronized type.
9394 if Nkind (N) = N_Private_Extension_Declaration then
9395 if not Synchronized_Present (N) then
9397 ("private extension of& must be explicitly synchronized",
9401 -- However, by 3.9.4(16/2), a full type that is a record extension
9402 -- is never allowed to derive from a synchronized interface (note
9403 -- that interfaces must be excluded from this check, because those
9404 -- are represented by derived type definitions in some cases).
9406 elsif Nkind (Type_Definition (N)) = N_Derived_Type_Definition
9407 and then not Interface_Present (Type_Definition (N))
9409 Error_Msg_N ("record extension cannot derive from synchronized"
9410 & " interface", Error_Node);
9414 -- Check that the characteristics of the progenitor are compatible
9415 -- with the explicit qualifier in the declaration.
9416 -- The check only applies to qualifiers that come from source.
9417 -- Limited_Present also appears in the declaration of corresponding
9418 -- records, and the check does not apply to them.
9420 if Limited_Present (Type_Def)
9422 Is_Concurrent_Record_Type (Defining_Identifier (N))
9424 if Is_Limited_Interface (Parent_Type)
9425 and then not Is_Limited_Interface (Iface_Id)
9428 ("progenitor& must be limited interface",
9429 Error_Node, Iface_Id);
9432 (Task_Present (Iface_Def)
9433 or else Protected_Present (Iface_Def)
9434 or else Synchronized_Present (Iface_Def))
9435 and then Nkind (N) /= N_Private_Extension_Declaration
9436 and then not Error_Posted (N)
9439 ("progenitor& must be limited interface",
9440 Error_Node, Iface_Id);
9443 -- Protected interfaces can only inherit from limited, synchronized
9444 -- or protected interfaces.
9446 elsif Nkind (N) = N_Full_Type_Declaration
9447 and then Protected_Present (Type_Def)
9449 if Limited_Present (Iface_Def)
9450 or else Synchronized_Present (Iface_Def)
9451 or else Protected_Present (Iface_Def)
9455 elsif Task_Present (Iface_Def) then
9456 Error_Msg_N ("(Ada 2005) protected interface cannot inherit"
9457 & " from task interface", Error_Node);
9460 Error_Msg_N ("(Ada 2005) protected interface cannot inherit"
9461 & " from non-limited interface", Error_Node);
9464 -- Ada 2005 (AI-345): Synchronized interfaces can only inherit from
9465 -- limited and synchronized.
9467 elsif Synchronized_Present (Type_Def) then
9468 if Limited_Present (Iface_Def)
9469 or else Synchronized_Present (Iface_Def)
9473 elsif Protected_Present (Iface_Def)
9474 and then Nkind (N) /= N_Private_Extension_Declaration
9476 Error_Msg_N ("(Ada 2005) synchronized interface cannot inherit"
9477 & " from protected interface", Error_Node);
9479 elsif Task_Present (Iface_Def)
9480 and then Nkind (N) /= N_Private_Extension_Declaration
9482 Error_Msg_N ("(Ada 2005) synchronized interface cannot inherit"
9483 & " from task interface", Error_Node);
9485 elsif not Is_Limited_Interface (Iface_Id) then
9486 Error_Msg_N ("(Ada 2005) synchronized interface cannot inherit"
9487 & " from non-limited interface", Error_Node);
9490 -- Ada 2005 (AI-345): Task interfaces can only inherit from limited,
9491 -- synchronized or task interfaces.
9493 elsif Nkind (N) = N_Full_Type_Declaration
9494 and then Task_Present (Type_Def)
9496 if Limited_Present (Iface_Def)
9497 or else Synchronized_Present (Iface_Def)
9498 or else Task_Present (Iface_Def)
9502 elsif Protected_Present (Iface_Def) then
9503 Error_Msg_N ("(Ada 2005) task interface cannot inherit from"
9504 & " protected interface", Error_Node);
9507 Error_Msg_N ("(Ada 2005) task interface cannot inherit from"
9508 & " non-limited interface", Error_Node);
9513 -- Start of processing for Check_Interfaces
9516 if Is_Interface (Parent_Type) then
9517 if Is_Task_Interface (Parent_Type) then
9520 elsif Is_Protected_Interface (Parent_Type) then
9521 Is_Protected := True;
9525 if Nkind (N) = N_Private_Extension_Declaration then
9527 -- Check that progenitors are compatible with declaration
9529 Iface := First (Interface_List (Def));
9530 while Present (Iface) loop
9531 Iface_Typ := Find_Type_Of_Subtype_Indic (Iface);
9533 Parent_Node := Parent (Base_Type (Iface_Typ));
9534 Iface_Def := Type_Definition (Parent_Node);
9536 if not Is_Interface (Iface_Typ) then
9537 Diagnose_Interface (Iface, Iface_Typ);
9540 Check_Ifaces (Iface_Def, Iface);
9546 if Is_Task and Is_Protected then
9548 ("type cannot derive from task and protected interface", N);
9554 -- Full type declaration of derived type.
9555 -- Check compatibility with parent if it is interface type
9557 if Nkind (Type_Definition (N)) = N_Derived_Type_Definition
9558 and then Is_Interface (Parent_Type)
9560 Parent_Node := Parent (Parent_Type);
9562 -- More detailed checks for interface varieties
9565 (Iface_Def => Type_Definition (Parent_Node),
9566 Error_Node => Subtype_Indication (Type_Definition (N)));
9569 Iface := First (Interface_List (Def));
9570 while Present (Iface) loop
9571 Iface_Typ := Find_Type_Of_Subtype_Indic (Iface);
9573 Parent_Node := Parent (Base_Type (Iface_Typ));
9574 Iface_Def := Type_Definition (Parent_Node);
9576 if not Is_Interface (Iface_Typ) then
9577 Diagnose_Interface (Iface, Iface_Typ);
9580 -- "The declaration of a specific descendant of an interface
9581 -- type freezes the interface type" RM 13.14
9583 Freeze_Before (N, Iface_Typ);
9584 Check_Ifaces (Iface_Def, Error_Node => Iface);
9590 if Is_Task and Is_Protected then
9592 ("type cannot derive from task and protected interface", N);
9594 end Check_Interfaces;
9596 ------------------------------------
9597 -- Check_Or_Process_Discriminants --
9598 ------------------------------------
9600 -- If an incomplete or private type declaration was already given for the
9601 -- type, the discriminants may have already been processed if they were
9602 -- present on the incomplete declaration. In this case a full conformance
9603 -- check has been performed in Find_Type_Name, and we then recheck here
9604 -- some properties that can't be checked on the partial view alone.
9605 -- Otherwise we call Process_Discriminants.
9607 procedure Check_Or_Process_Discriminants
9610 Prev : Entity_Id := Empty)
9613 if Has_Discriminants (T) then
9615 -- Discriminants are already set on T if they were already present
9616 -- on the partial view. Make them visible to component declarations.
9620 -- Discriminant on T (full view) referencing expr on partial view
9623 -- Entity of corresponding discriminant on partial view
9626 -- Discriminant specification for full view, expression is the
9627 -- syntactic copy on full view (which has been checked for
9628 -- conformance with partial view), only used here to post error
9632 D := First_Discriminant (T);
9633 New_D := First (Discriminant_Specifications (N));
9634 while Present (D) loop
9635 Prev_D := Current_Entity (D);
9636 Set_Current_Entity (D);
9637 Set_Is_Immediately_Visible (D);
9638 Set_Homonym (D, Prev_D);
9640 -- Handle the case where there is an untagged partial view and
9641 -- the full view is tagged: must disallow discriminants with
9642 -- defaults. However suppress the error here if it was already
9643 -- reported on the default expression of the partial view.
9645 if Is_Tagged_Type (T)
9646 and then Present (Expression (Parent (D)))
9647 and then not Error_Posted (Expression (Parent (D)))
9650 ("discriminants of tagged type cannot have defaults",
9651 Expression (New_D));
9654 -- Ada 2005 (AI-230): Access discriminant allowed in
9655 -- non-limited record types.
9657 if Ada_Version < Ada_2005 then
9659 -- This restriction gets applied to the full type here. It
9660 -- has already been applied earlier to the partial view.
9662 Check_Access_Discriminant_Requires_Limited (Parent (D), N);
9665 Next_Discriminant (D);
9670 elsif Present (Discriminant_Specifications (N)) then
9671 Process_Discriminants (N, Prev);
9673 end Check_Or_Process_Discriminants;
9675 ----------------------
9676 -- Check_Real_Bound --
9677 ----------------------
9679 procedure Check_Real_Bound (Bound : Node_Id) is
9681 if not Is_Real_Type (Etype (Bound)) then
9683 ("bound in real type definition must be of real type", Bound);
9685 elsif not Is_OK_Static_Expression (Bound) then
9686 Flag_Non_Static_Expr
9687 ("non-static expression used for real type bound!", Bound);
9694 (Bound, Make_Real_Literal (Sloc (Bound), Ureal_0));
9696 Resolve (Bound, Standard_Float);
9697 end Check_Real_Bound;
9699 ------------------------------
9700 -- Complete_Private_Subtype --
9701 ------------------------------
9703 procedure Complete_Private_Subtype
9706 Full_Base : Entity_Id;
9707 Related_Nod : Node_Id)
9709 Save_Next_Entity : Entity_Id;
9710 Save_Homonym : Entity_Id;
9713 -- Set semantic attributes for (implicit) private subtype completion.
9714 -- If the full type has no discriminants, then it is a copy of the full
9715 -- view of the base. Otherwise, it is a subtype of the base with a
9716 -- possible discriminant constraint. Save and restore the original
9717 -- Next_Entity field of full to ensure that the calls to Copy_Node
9718 -- do not corrupt the entity chain.
9720 -- Note that the type of the full view is the same entity as the type of
9721 -- the partial view. In this fashion, the subtype has access to the
9722 -- correct view of the parent.
9724 Save_Next_Entity := Next_Entity (Full);
9725 Save_Homonym := Homonym (Priv);
9727 case Ekind (Full_Base) is
9728 when E_Record_Type |
9734 Copy_Node (Priv, Full);
9736 Set_Has_Discriminants (Full, Has_Discriminants (Full_Base));
9737 Set_First_Entity (Full, First_Entity (Full_Base));
9738 Set_Last_Entity (Full, Last_Entity (Full_Base));
9741 Copy_Node (Full_Base, Full);
9742 Set_Chars (Full, Chars (Priv));
9743 Conditional_Delay (Full, Priv);
9744 Set_Sloc (Full, Sloc (Priv));
9747 Set_Next_Entity (Full, Save_Next_Entity);
9748 Set_Homonym (Full, Save_Homonym);
9749 Set_Associated_Node_For_Itype (Full, Related_Nod);
9751 -- Set common attributes for all subtypes
9753 Set_Ekind (Full, Subtype_Kind (Ekind (Full_Base)));
9755 -- The Etype of the full view is inconsistent. Gigi needs to see the
9756 -- structural full view, which is what the current scheme gives:
9757 -- the Etype of the full view is the etype of the full base. However,
9758 -- if the full base is a derived type, the full view then looks like
9759 -- a subtype of the parent, not a subtype of the full base. If instead
9762 -- Set_Etype (Full, Full_Base);
9764 -- then we get inconsistencies in the front-end (confusion between
9765 -- views). Several outstanding bugs are related to this ???
9767 Set_Is_First_Subtype (Full, False);
9768 Set_Scope (Full, Scope (Priv));
9769 Set_Size_Info (Full, Full_Base);
9770 Set_RM_Size (Full, RM_Size (Full_Base));
9771 Set_Is_Itype (Full);
9773 -- A subtype of a private-type-without-discriminants, whose full-view
9774 -- has discriminants with default expressions, is not constrained!
9776 if not Has_Discriminants (Priv) then
9777 Set_Is_Constrained (Full, Is_Constrained (Full_Base));
9779 if Has_Discriminants (Full_Base) then
9780 Set_Discriminant_Constraint
9781 (Full, Discriminant_Constraint (Full_Base));
9783 -- The partial view may have been indefinite, the full view
9786 Set_Has_Unknown_Discriminants
9787 (Full, Has_Unknown_Discriminants (Full_Base));
9791 Set_First_Rep_Item (Full, First_Rep_Item (Full_Base));
9792 Set_Depends_On_Private (Full, Has_Private_Component (Full));
9794 -- Freeze the private subtype entity if its parent is delayed, and not
9795 -- already frozen. We skip this processing if the type is an anonymous
9796 -- subtype of a record component, or is the corresponding record of a
9797 -- protected type, since ???
9799 if not Is_Type (Scope (Full)) then
9800 Set_Has_Delayed_Freeze (Full,
9801 Has_Delayed_Freeze (Full_Base)
9802 and then (not Is_Frozen (Full_Base)));
9805 Set_Freeze_Node (Full, Empty);
9806 Set_Is_Frozen (Full, False);
9807 Set_Full_View (Priv, Full);
9809 if Has_Discriminants (Full) then
9810 Set_Stored_Constraint_From_Discriminant_Constraint (Full);
9811 Set_Stored_Constraint (Priv, Stored_Constraint (Full));
9813 if Has_Unknown_Discriminants (Full) then
9814 Set_Discriminant_Constraint (Full, No_Elist);
9818 if Ekind (Full_Base) = E_Record_Type
9819 and then Has_Discriminants (Full_Base)
9820 and then Has_Discriminants (Priv) -- might not, if errors
9821 and then not Has_Unknown_Discriminants (Priv)
9822 and then not Is_Empty_Elmt_List (Discriminant_Constraint (Priv))
9824 Create_Constrained_Components
9825 (Full, Related_Nod, Full_Base, Discriminant_Constraint (Priv));
9827 -- If the full base is itself derived from private, build a congruent
9828 -- subtype of its underlying type, for use by the back end. For a
9829 -- constrained record component, the declaration cannot be placed on
9830 -- the component list, but it must nevertheless be built an analyzed, to
9831 -- supply enough information for Gigi to compute the size of component.
9833 elsif Ekind (Full_Base) in Private_Kind
9834 and then Is_Derived_Type (Full_Base)
9835 and then Has_Discriminants (Full_Base)
9836 and then (Ekind (Current_Scope) /= E_Record_Subtype)
9838 if not Is_Itype (Priv)
9840 Nkind (Subtype_Indication (Parent (Priv))) = N_Subtype_Indication
9842 Build_Underlying_Full_View
9843 (Parent (Priv), Full, Etype (Full_Base));
9845 elsif Nkind (Related_Nod) = N_Component_Declaration then
9846 Build_Underlying_Full_View (Related_Nod, Full, Etype (Full_Base));
9849 elsif Is_Record_Type (Full_Base) then
9851 -- Show Full is simply a renaming of Full_Base
9853 Set_Cloned_Subtype (Full, Full_Base);
9856 -- It is unsafe to share to bounds of a scalar type, because the Itype
9857 -- is elaborated on demand, and if a bound is non-static then different
9858 -- orders of elaboration in different units will lead to different
9859 -- external symbols.
9861 if Is_Scalar_Type (Full_Base) then
9862 Set_Scalar_Range (Full,
9863 Make_Range (Sloc (Related_Nod),
9865 Duplicate_Subexpr_No_Checks (Type_Low_Bound (Full_Base)),
9867 Duplicate_Subexpr_No_Checks (Type_High_Bound (Full_Base))));
9869 -- This completion inherits the bounds of the full parent, but if
9870 -- the parent is an unconstrained floating point type, so is the
9873 if Is_Floating_Point_Type (Full_Base) then
9874 Set_Includes_Infinities
9875 (Scalar_Range (Full), Has_Infinities (Full_Base));
9879 -- ??? It seems that a lot of fields are missing that should be copied
9880 -- from Full_Base to Full. Here are some that are introduced in a
9881 -- non-disruptive way but a cleanup is necessary.
9883 if Is_Tagged_Type (Full_Base) then
9884 Set_Is_Tagged_Type (Full);
9885 Set_Direct_Primitive_Operations (Full,
9886 Direct_Primitive_Operations (Full_Base));
9888 -- Inherit class_wide type of full_base in case the partial view was
9889 -- not tagged. Otherwise it has already been created when the private
9890 -- subtype was analyzed.
9892 if No (Class_Wide_Type (Full)) then
9893 Set_Class_Wide_Type (Full, Class_Wide_Type (Full_Base));
9896 -- If this is a subtype of a protected or task type, constrain its
9897 -- corresponding record, unless this is a subtype without constraints,
9898 -- i.e. a simple renaming as with an actual subtype in an instance.
9900 elsif Is_Concurrent_Type (Full_Base) then
9901 if Has_Discriminants (Full)
9902 and then Present (Corresponding_Record_Type (Full_Base))
9904 not Is_Empty_Elmt_List (Discriminant_Constraint (Full))
9906 Set_Corresponding_Record_Type (Full,
9907 Constrain_Corresponding_Record
9908 (Full, Corresponding_Record_Type (Full_Base),
9909 Related_Nod, Full_Base));
9912 Set_Corresponding_Record_Type (Full,
9913 Corresponding_Record_Type (Full_Base));
9917 -- Copy rep item chain, and also setting of Has_Predicates from
9918 -- private subtype to full subtype, since we will need these on the
9919 -- full subtype to create the predicate function.
9921 Set_First_Rep_Item (Full, First_Rep_Item (Priv));
9922 Set_Has_Predicates (Full, Has_Predicates (Priv));
9923 end Complete_Private_Subtype;
9925 ----------------------------
9926 -- Constant_Redeclaration --
9927 ----------------------------
9929 procedure Constant_Redeclaration
9934 Prev : constant Entity_Id := Current_Entity_In_Scope (Id);
9935 Obj_Def : constant Node_Id := Object_Definition (N);
9938 procedure Check_Possible_Deferred_Completion
9939 (Prev_Id : Entity_Id;
9940 Prev_Obj_Def : Node_Id;
9941 Curr_Obj_Def : Node_Id);
9942 -- Determine whether the two object definitions describe the partial
9943 -- and the full view of a constrained deferred constant. Generate
9944 -- a subtype for the full view and verify that it statically matches
9945 -- the subtype of the partial view.
9947 procedure Check_Recursive_Declaration (Typ : Entity_Id);
9948 -- If deferred constant is an access type initialized with an allocator,
9949 -- check whether there is an illegal recursion in the definition,
9950 -- through a default value of some record subcomponent. This is normally
9951 -- detected when generating init procs, but requires this additional
9952 -- mechanism when expansion is disabled.
9954 ----------------------------------------
9955 -- Check_Possible_Deferred_Completion --
9956 ----------------------------------------
9958 procedure Check_Possible_Deferred_Completion
9959 (Prev_Id : Entity_Id;
9960 Prev_Obj_Def : Node_Id;
9961 Curr_Obj_Def : Node_Id)
9964 if Nkind (Prev_Obj_Def) = N_Subtype_Indication
9965 and then Present (Constraint (Prev_Obj_Def))
9966 and then Nkind (Curr_Obj_Def) = N_Subtype_Indication
9967 and then Present (Constraint (Curr_Obj_Def))
9970 Loc : constant Source_Ptr := Sloc (N);
9971 Def_Id : constant Entity_Id := Make_Temporary (Loc, 'S');
9972 Decl : constant Node_Id :=
9973 Make_Subtype_Declaration (Loc,
9974 Defining_Identifier => Def_Id,
9975 Subtype_Indication =>
9976 Relocate_Node (Curr_Obj_Def));
9979 Insert_Before_And_Analyze (N, Decl);
9980 Set_Etype (Id, Def_Id);
9982 if not Subtypes_Statically_Match (Etype (Prev_Id), Def_Id) then
9983 Error_Msg_Sloc := Sloc (Prev_Id);
9984 Error_Msg_N ("subtype does not statically match deferred " &
9989 end Check_Possible_Deferred_Completion;
9991 ---------------------------------
9992 -- Check_Recursive_Declaration --
9993 ---------------------------------
9995 procedure Check_Recursive_Declaration (Typ : Entity_Id) is
9999 if Is_Record_Type (Typ) then
10000 Comp := First_Component (Typ);
10001 while Present (Comp) loop
10002 if Comes_From_Source (Comp) then
10003 if Present (Expression (Parent (Comp)))
10004 and then Is_Entity_Name (Expression (Parent (Comp)))
10005 and then Entity (Expression (Parent (Comp))) = Prev
10007 Error_Msg_Sloc := Sloc (Parent (Comp));
10009 ("illegal circularity with declaration for&#",
10013 elsif Is_Record_Type (Etype (Comp)) then
10014 Check_Recursive_Declaration (Etype (Comp));
10018 Next_Component (Comp);
10021 end Check_Recursive_Declaration;
10023 -- Start of processing for Constant_Redeclaration
10026 if Nkind (Parent (Prev)) = N_Object_Declaration then
10027 if Nkind (Object_Definition
10028 (Parent (Prev))) = N_Subtype_Indication
10030 -- Find type of new declaration. The constraints of the two
10031 -- views must match statically, but there is no point in
10032 -- creating an itype for the full view.
10034 if Nkind (Obj_Def) = N_Subtype_Indication then
10035 Find_Type (Subtype_Mark (Obj_Def));
10036 New_T := Entity (Subtype_Mark (Obj_Def));
10039 Find_Type (Obj_Def);
10040 New_T := Entity (Obj_Def);
10046 -- The full view may impose a constraint, even if the partial
10047 -- view does not, so construct the subtype.
10049 New_T := Find_Type_Of_Object (Obj_Def, N);
10054 -- Current declaration is illegal, diagnosed below in Enter_Name
10060 -- If previous full declaration or a renaming declaration exists, or if
10061 -- a homograph is present, let Enter_Name handle it, either with an
10062 -- error or with the removal of an overridden implicit subprogram.
10064 if Ekind (Prev) /= E_Constant
10065 or else Nkind (Parent (Prev)) = N_Object_Renaming_Declaration
10066 or else Present (Expression (Parent (Prev)))
10067 or else Present (Full_View (Prev))
10071 -- Verify that types of both declarations match, or else that both types
10072 -- are anonymous access types whose designated subtypes statically match
10073 -- (as allowed in Ada 2005 by AI-385).
10075 elsif Base_Type (Etype (Prev)) /= Base_Type (New_T)
10077 (Ekind (Etype (Prev)) /= E_Anonymous_Access_Type
10078 or else Ekind (Etype (New_T)) /= E_Anonymous_Access_Type
10079 or else Is_Access_Constant (Etype (New_T)) /=
10080 Is_Access_Constant (Etype (Prev))
10081 or else Can_Never_Be_Null (Etype (New_T)) /=
10082 Can_Never_Be_Null (Etype (Prev))
10083 or else Null_Exclusion_Present (Parent (Prev)) /=
10084 Null_Exclusion_Present (Parent (Id))
10085 or else not Subtypes_Statically_Match
10086 (Designated_Type (Etype (Prev)),
10087 Designated_Type (Etype (New_T))))
10089 Error_Msg_Sloc := Sloc (Prev);
10090 Error_Msg_N ("type does not match declaration#", N);
10091 Set_Full_View (Prev, Id);
10092 Set_Etype (Id, Any_Type);
10095 Null_Exclusion_Present (Parent (Prev))
10096 and then not Null_Exclusion_Present (N)
10098 Error_Msg_Sloc := Sloc (Prev);
10099 Error_Msg_N ("null-exclusion does not match declaration#", N);
10100 Set_Full_View (Prev, Id);
10101 Set_Etype (Id, Any_Type);
10103 -- If so, process the full constant declaration
10106 -- RM 7.4 (6): If the subtype defined by the subtype_indication in
10107 -- the deferred declaration is constrained, then the subtype defined
10108 -- by the subtype_indication in the full declaration shall match it
10111 Check_Possible_Deferred_Completion
10113 Prev_Obj_Def => Object_Definition (Parent (Prev)),
10114 Curr_Obj_Def => Obj_Def);
10116 Set_Full_View (Prev, Id);
10117 Set_Is_Public (Id, Is_Public (Prev));
10118 Set_Is_Internal (Id);
10119 Append_Entity (Id, Current_Scope);
10121 -- Check ALIASED present if present before (RM 7.4(7))
10123 if Is_Aliased (Prev)
10124 and then not Aliased_Present (N)
10126 Error_Msg_Sloc := Sloc (Prev);
10127 Error_Msg_N ("ALIASED required (see declaration#)", N);
10130 -- Check that placement is in private part and that the incomplete
10131 -- declaration appeared in the visible part.
10133 if Ekind (Current_Scope) = E_Package
10134 and then not In_Private_Part (Current_Scope)
10136 Error_Msg_Sloc := Sloc (Prev);
10138 ("full constant for declaration#"
10139 & " must be in private part", N);
10141 elsif Ekind (Current_Scope) = E_Package
10143 List_Containing (Parent (Prev)) /=
10144 Visible_Declarations
10145 (Specification (Unit_Declaration_Node (Current_Scope)))
10148 ("deferred constant must be declared in visible part",
10152 if Is_Access_Type (T)
10153 and then Nkind (Expression (N)) = N_Allocator
10155 Check_Recursive_Declaration (Designated_Type (T));
10158 end Constant_Redeclaration;
10160 ----------------------
10161 -- Constrain_Access --
10162 ----------------------
10164 procedure Constrain_Access
10165 (Def_Id : in out Entity_Id;
10167 Related_Nod : Node_Id)
10169 T : constant Entity_Id := Entity (Subtype_Mark (S));
10170 Desig_Type : constant Entity_Id := Designated_Type (T);
10171 Desig_Subtype : Entity_Id := Create_Itype (E_Void, Related_Nod);
10172 Constraint_OK : Boolean := True;
10174 function Has_Defaulted_Discriminants (Typ : Entity_Id) return Boolean;
10175 -- Simple predicate to test for defaulted discriminants
10176 -- Shouldn't this be in sem_util???
10178 ---------------------------------
10179 -- Has_Defaulted_Discriminants --
10180 ---------------------------------
10182 function Has_Defaulted_Discriminants (Typ : Entity_Id) return Boolean is
10184 return Has_Discriminants (Typ)
10185 and then Present (First_Discriminant (Typ))
10187 (Discriminant_Default_Value (First_Discriminant (Typ)));
10188 end Has_Defaulted_Discriminants;
10190 -- Start of processing for Constrain_Access
10193 if Is_Array_Type (Desig_Type) then
10194 Constrain_Array (Desig_Subtype, S, Related_Nod, Def_Id, 'P');
10196 elsif (Is_Record_Type (Desig_Type)
10197 or else Is_Incomplete_Or_Private_Type (Desig_Type))
10198 and then not Is_Constrained (Desig_Type)
10200 -- ??? The following code is a temporary kludge to ignore a
10201 -- discriminant constraint on access type if it is constraining
10202 -- the current record. Avoid creating the implicit subtype of the
10203 -- record we are currently compiling since right now, we cannot
10204 -- handle these. For now, just return the access type itself.
10206 if Desig_Type = Current_Scope
10207 and then No (Def_Id)
10209 Set_Ekind (Desig_Subtype, E_Record_Subtype);
10210 Def_Id := Entity (Subtype_Mark (S));
10212 -- This call added to ensure that the constraint is analyzed
10213 -- (needed for a B test). Note that we still return early from
10214 -- this procedure to avoid recursive processing. ???
10216 Constrain_Discriminated_Type
10217 (Desig_Subtype, S, Related_Nod, For_Access => True);
10221 if (Ekind (T) = E_General_Access_Type
10222 or else Ada_Version >= Ada_2005)
10223 and then Has_Private_Declaration (Desig_Type)
10224 and then In_Open_Scopes (Scope (Desig_Type))
10225 and then Has_Discriminants (Desig_Type)
10227 -- Enforce rule that the constraint is illegal if there is
10228 -- an unconstrained view of the designated type. This means
10229 -- that the partial view (either a private type declaration or
10230 -- a derivation from a private type) has no discriminants.
10231 -- (Defect Report 8652/0008, Technical Corrigendum 1, checked
10232 -- by ACATS B371001).
10234 -- Rule updated for Ada 2005: the private type is said to have
10235 -- a constrained partial view, given that objects of the type
10236 -- can be declared. Furthermore, the rule applies to all access
10237 -- types, unlike the rule concerning default discriminants.
10240 Pack : constant Node_Id :=
10241 Unit_Declaration_Node (Scope (Desig_Type));
10246 if Nkind (Pack) = N_Package_Declaration then
10247 Decls := Visible_Declarations (Specification (Pack));
10248 Decl := First (Decls);
10249 while Present (Decl) loop
10250 if (Nkind (Decl) = N_Private_Type_Declaration
10252 Chars (Defining_Identifier (Decl)) =
10253 Chars (Desig_Type))
10256 (Nkind (Decl) = N_Full_Type_Declaration
10258 Chars (Defining_Identifier (Decl)) =
10260 and then Is_Derived_Type (Desig_Type)
10262 Has_Private_Declaration (Etype (Desig_Type)))
10264 if No (Discriminant_Specifications (Decl)) then
10266 ("cannot constrain general access type if " &
10267 "designated type has constrained partial view",
10280 Constrain_Discriminated_Type (Desig_Subtype, S, Related_Nod,
10281 For_Access => True);
10283 elsif (Is_Task_Type (Desig_Type)
10284 or else Is_Protected_Type (Desig_Type))
10285 and then not Is_Constrained (Desig_Type)
10287 Constrain_Concurrent
10288 (Desig_Subtype, S, Related_Nod, Desig_Type, ' ');
10291 Error_Msg_N ("invalid constraint on access type", S);
10292 Desig_Subtype := Desig_Type; -- Ignore invalid constraint.
10293 Constraint_OK := False;
10296 if No (Def_Id) then
10297 Def_Id := Create_Itype (E_Access_Subtype, Related_Nod);
10299 Set_Ekind (Def_Id, E_Access_Subtype);
10302 if Constraint_OK then
10303 Set_Etype (Def_Id, Base_Type (T));
10305 if Is_Private_Type (Desig_Type) then
10306 Prepare_Private_Subtype_Completion (Desig_Subtype, Related_Nod);
10309 Set_Etype (Def_Id, Any_Type);
10312 Set_Size_Info (Def_Id, T);
10313 Set_Is_Constrained (Def_Id, Constraint_OK);
10314 Set_Directly_Designated_Type (Def_Id, Desig_Subtype);
10315 Set_Depends_On_Private (Def_Id, Has_Private_Component (Def_Id));
10316 Set_Is_Access_Constant (Def_Id, Is_Access_Constant (T));
10318 Conditional_Delay (Def_Id, T);
10320 -- AI-363 : Subtypes of general access types whose designated types have
10321 -- default discriminants are disallowed. In instances, the rule has to
10322 -- be checked against the actual, of which T is the subtype. In a
10323 -- generic body, the rule is checked assuming that the actual type has
10324 -- defaulted discriminants.
10326 if Ada_Version >= Ada_2005 or else Warn_On_Ada_2005_Compatibility then
10327 if Ekind (Base_Type (T)) = E_General_Access_Type
10328 and then Has_Defaulted_Discriminants (Desig_Type)
10330 if Ada_Version < Ada_2005 then
10332 ("access subtype of general access type would not " &
10333 "be allowed in Ada 2005?", S);
10336 ("access subype of general access type not allowed", S);
10339 Error_Msg_N ("\discriminants have defaults", S);
10341 elsif Is_Access_Type (T)
10342 and then Is_Generic_Type (Desig_Type)
10343 and then Has_Discriminants (Desig_Type)
10344 and then In_Package_Body (Current_Scope)
10346 if Ada_Version < Ada_2005 then
10348 ("access subtype would not be allowed in generic body " &
10349 "in Ada 2005?", S);
10352 ("access subtype not allowed in generic body", S);
10356 ("\designated type is a discriminated formal", S);
10359 end Constrain_Access;
10361 ---------------------
10362 -- Constrain_Array --
10363 ---------------------
10365 procedure Constrain_Array
10366 (Def_Id : in out Entity_Id;
10368 Related_Nod : Node_Id;
10369 Related_Id : Entity_Id;
10370 Suffix : Character)
10372 C : constant Node_Id := Constraint (SI);
10373 Number_Of_Constraints : Nat := 0;
10376 Constraint_OK : Boolean := True;
10379 T := Entity (Subtype_Mark (SI));
10381 if Ekind (T) in Access_Kind then
10382 T := Designated_Type (T);
10385 -- If an index constraint follows a subtype mark in a subtype indication
10386 -- then the type or subtype denoted by the subtype mark must not already
10387 -- impose an index constraint. The subtype mark must denote either an
10388 -- unconstrained array type or an access type whose designated type
10389 -- is such an array type... (RM 3.6.1)
10391 if Is_Constrained (T) then
10392 Error_Msg_N ("array type is already constrained", Subtype_Mark (SI));
10393 Constraint_OK := False;
10396 S := First (Constraints (C));
10397 while Present (S) loop
10398 Number_Of_Constraints := Number_Of_Constraints + 1;
10402 -- In either case, the index constraint must provide a discrete
10403 -- range for each index of the array type and the type of each
10404 -- discrete range must be the same as that of the corresponding
10405 -- index. (RM 3.6.1)
10407 if Number_Of_Constraints /= Number_Dimensions (T) then
10408 Error_Msg_NE ("incorrect number of index constraints for }", C, T);
10409 Constraint_OK := False;
10412 S := First (Constraints (C));
10413 Index := First_Index (T);
10416 -- Apply constraints to each index type
10418 for J in 1 .. Number_Of_Constraints loop
10419 Constrain_Index (Index, S, Related_Nod, Related_Id, Suffix, J);
10427 if No (Def_Id) then
10429 Create_Itype (E_Array_Subtype, Related_Nod, Related_Id, Suffix);
10430 Set_Parent (Def_Id, Related_Nod);
10433 Set_Ekind (Def_Id, E_Array_Subtype);
10436 Set_Size_Info (Def_Id, (T));
10437 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
10438 Set_Etype (Def_Id, Base_Type (T));
10440 if Constraint_OK then
10441 Set_First_Index (Def_Id, First (Constraints (C)));
10443 Set_First_Index (Def_Id, First_Index (T));
10446 Set_Is_Constrained (Def_Id, True);
10447 Set_Is_Aliased (Def_Id, Is_Aliased (T));
10448 Set_Depends_On_Private (Def_Id, Has_Private_Component (Def_Id));
10450 Set_Is_Private_Composite (Def_Id, Is_Private_Composite (T));
10451 Set_Is_Limited_Composite (Def_Id, Is_Limited_Composite (T));
10453 -- A subtype does not inherit the packed_array_type of is parent. We
10454 -- need to initialize the attribute because if Def_Id is previously
10455 -- analyzed through a limited_with clause, it will have the attributes
10456 -- of an incomplete type, one of which is an Elist that overlaps the
10457 -- Packed_Array_Type field.
10459 Set_Packed_Array_Type (Def_Id, Empty);
10461 -- Build a freeze node if parent still needs one. Also make sure that
10462 -- the Depends_On_Private status is set because the subtype will need
10463 -- reprocessing at the time the base type does, and also we must set a
10464 -- conditional delay.
10466 Set_Depends_On_Private (Def_Id, Depends_On_Private (T));
10467 Conditional_Delay (Def_Id, T);
10468 end Constrain_Array;
10470 ------------------------------
10471 -- Constrain_Component_Type --
10472 ------------------------------
10474 function Constrain_Component_Type
10476 Constrained_Typ : Entity_Id;
10477 Related_Node : Node_Id;
10479 Constraints : Elist_Id) return Entity_Id
10481 Loc : constant Source_Ptr := Sloc (Constrained_Typ);
10482 Compon_Type : constant Entity_Id := Etype (Comp);
10484 function Build_Constrained_Array_Type
10485 (Old_Type : Entity_Id) return Entity_Id;
10486 -- If Old_Type is an array type, one of whose indexes is constrained
10487 -- by a discriminant, build an Itype whose constraint replaces the
10488 -- discriminant with its value in the constraint.
10490 function Build_Constrained_Discriminated_Type
10491 (Old_Type : Entity_Id) return Entity_Id;
10492 -- Ditto for record components
10494 function Build_Constrained_Access_Type
10495 (Old_Type : Entity_Id) return Entity_Id;
10496 -- Ditto for access types. Makes use of previous two functions, to
10497 -- constrain designated type.
10499 function Build_Subtype (T : Entity_Id; C : List_Id) return Entity_Id;
10500 -- T is an array or discriminated type, C is a list of constraints
10501 -- that apply to T. This routine builds the constrained subtype.
10503 function Is_Discriminant (Expr : Node_Id) return Boolean;
10504 -- Returns True if Expr is a discriminant
10506 function Get_Discr_Value (Discrim : Entity_Id) return Node_Id;
10507 -- Find the value of discriminant Discrim in Constraint
10509 -----------------------------------
10510 -- Build_Constrained_Access_Type --
10511 -----------------------------------
10513 function Build_Constrained_Access_Type
10514 (Old_Type : Entity_Id) return Entity_Id
10516 Desig_Type : constant Entity_Id := Designated_Type (Old_Type);
10518 Desig_Subtype : Entity_Id;
10522 -- if the original access type was not embedded in the enclosing
10523 -- type definition, there is no need to produce a new access
10524 -- subtype. In fact every access type with an explicit constraint
10525 -- generates an itype whose scope is the enclosing record.
10527 if not Is_Type (Scope (Old_Type)) then
10530 elsif Is_Array_Type (Desig_Type) then
10531 Desig_Subtype := Build_Constrained_Array_Type (Desig_Type);
10533 elsif Has_Discriminants (Desig_Type) then
10535 -- This may be an access type to an enclosing record type for
10536 -- which we are constructing the constrained components. Return
10537 -- the enclosing record subtype. This is not always correct,
10538 -- but avoids infinite recursion. ???
10540 Desig_Subtype := Any_Type;
10542 for J in reverse 0 .. Scope_Stack.Last loop
10543 Scop := Scope_Stack.Table (J).Entity;
10546 and then Base_Type (Scop) = Base_Type (Desig_Type)
10548 Desig_Subtype := Scop;
10551 exit when not Is_Type (Scop);
10554 if Desig_Subtype = Any_Type then
10556 Build_Constrained_Discriminated_Type (Desig_Type);
10563 if Desig_Subtype /= Desig_Type then
10565 -- The Related_Node better be here or else we won't be able
10566 -- to attach new itypes to a node in the tree.
10568 pragma Assert (Present (Related_Node));
10570 Itype := Create_Itype (E_Access_Subtype, Related_Node);
10572 Set_Etype (Itype, Base_Type (Old_Type));
10573 Set_Size_Info (Itype, (Old_Type));
10574 Set_Directly_Designated_Type (Itype, Desig_Subtype);
10575 Set_Depends_On_Private (Itype, Has_Private_Component
10577 Set_Is_Access_Constant (Itype, Is_Access_Constant
10580 -- The new itype needs freezing when it depends on a not frozen
10581 -- type and the enclosing subtype needs freezing.
10583 if Has_Delayed_Freeze (Constrained_Typ)
10584 and then not Is_Frozen (Constrained_Typ)
10586 Conditional_Delay (Itype, Base_Type (Old_Type));
10594 end Build_Constrained_Access_Type;
10596 ----------------------------------
10597 -- Build_Constrained_Array_Type --
10598 ----------------------------------
10600 function Build_Constrained_Array_Type
10601 (Old_Type : Entity_Id) return Entity_Id
10605 Old_Index : Node_Id;
10606 Range_Node : Node_Id;
10607 Constr_List : List_Id;
10609 Need_To_Create_Itype : Boolean := False;
10612 Old_Index := First_Index (Old_Type);
10613 while Present (Old_Index) loop
10614 Get_Index_Bounds (Old_Index, Lo_Expr, Hi_Expr);
10616 if Is_Discriminant (Lo_Expr)
10617 or else Is_Discriminant (Hi_Expr)
10619 Need_To_Create_Itype := True;
10622 Next_Index (Old_Index);
10625 if Need_To_Create_Itype then
10626 Constr_List := New_List;
10628 Old_Index := First_Index (Old_Type);
10629 while Present (Old_Index) loop
10630 Get_Index_Bounds (Old_Index, Lo_Expr, Hi_Expr);
10632 if Is_Discriminant (Lo_Expr) then
10633 Lo_Expr := Get_Discr_Value (Lo_Expr);
10636 if Is_Discriminant (Hi_Expr) then
10637 Hi_Expr := Get_Discr_Value (Hi_Expr);
10642 (Loc, New_Copy_Tree (Lo_Expr), New_Copy_Tree (Hi_Expr));
10644 Append (Range_Node, To => Constr_List);
10646 Next_Index (Old_Index);
10649 return Build_Subtype (Old_Type, Constr_List);
10654 end Build_Constrained_Array_Type;
10656 ------------------------------------------
10657 -- Build_Constrained_Discriminated_Type --
10658 ------------------------------------------
10660 function Build_Constrained_Discriminated_Type
10661 (Old_Type : Entity_Id) return Entity_Id
10664 Constr_List : List_Id;
10665 Old_Constraint : Elmt_Id;
10667 Need_To_Create_Itype : Boolean := False;
10670 Old_Constraint := First_Elmt (Discriminant_Constraint (Old_Type));
10671 while Present (Old_Constraint) loop
10672 Expr := Node (Old_Constraint);
10674 if Is_Discriminant (Expr) then
10675 Need_To_Create_Itype := True;
10678 Next_Elmt (Old_Constraint);
10681 if Need_To_Create_Itype then
10682 Constr_List := New_List;
10684 Old_Constraint := First_Elmt (Discriminant_Constraint (Old_Type));
10685 while Present (Old_Constraint) loop
10686 Expr := Node (Old_Constraint);
10688 if Is_Discriminant (Expr) then
10689 Expr := Get_Discr_Value (Expr);
10692 Append (New_Copy_Tree (Expr), To => Constr_List);
10694 Next_Elmt (Old_Constraint);
10697 return Build_Subtype (Old_Type, Constr_List);
10702 end Build_Constrained_Discriminated_Type;
10704 -------------------
10705 -- Build_Subtype --
10706 -------------------
10708 function Build_Subtype (T : Entity_Id; C : List_Id) return Entity_Id is
10710 Subtyp_Decl : Node_Id;
10711 Def_Id : Entity_Id;
10712 Btyp : Entity_Id := Base_Type (T);
10715 -- The Related_Node better be here or else we won't be able to
10716 -- attach new itypes to a node in the tree.
10718 pragma Assert (Present (Related_Node));
10720 -- If the view of the component's type is incomplete or private
10721 -- with unknown discriminants, then the constraint must be applied
10722 -- to the full type.
10724 if Has_Unknown_Discriminants (Btyp)
10725 and then Present (Underlying_Type (Btyp))
10727 Btyp := Underlying_Type (Btyp);
10731 Make_Subtype_Indication (Loc,
10732 Subtype_Mark => New_Occurrence_Of (Btyp, Loc),
10733 Constraint => Make_Index_Or_Discriminant_Constraint (Loc, C));
10735 Def_Id := Create_Itype (Ekind (T), Related_Node);
10738 Make_Subtype_Declaration (Loc,
10739 Defining_Identifier => Def_Id,
10740 Subtype_Indication => Indic);
10742 Set_Parent (Subtyp_Decl, Parent (Related_Node));
10744 -- Itypes must be analyzed with checks off (see package Itypes)
10746 Analyze (Subtyp_Decl, Suppress => All_Checks);
10751 ---------------------
10752 -- Get_Discr_Value --
10753 ---------------------
10755 function Get_Discr_Value (Discrim : Entity_Id) return Node_Id is
10760 -- The discriminant may be declared for the type, in which case we
10761 -- find it by iterating over the list of discriminants. If the
10762 -- discriminant is inherited from a parent type, it appears as the
10763 -- corresponding discriminant of the current type. This will be the
10764 -- case when constraining an inherited component whose constraint is
10765 -- given by a discriminant of the parent.
10767 D := First_Discriminant (Typ);
10768 E := First_Elmt (Constraints);
10770 while Present (D) loop
10771 if D = Entity (Discrim)
10772 or else D = CR_Discriminant (Entity (Discrim))
10773 or else Corresponding_Discriminant (D) = Entity (Discrim)
10778 Next_Discriminant (D);
10782 -- The Corresponding_Discriminant mechanism is incomplete, because
10783 -- the correspondence between new and old discriminants is not one
10784 -- to one: one new discriminant can constrain several old ones. In
10785 -- that case, scan sequentially the stored_constraint, the list of
10786 -- discriminants of the parents, and the constraints.
10787 -- Previous code checked for the present of the Stored_Constraint
10788 -- list for the derived type, but did not use it at all. Should it
10789 -- be present when the component is a discriminated task type?
10791 if Is_Derived_Type (Typ)
10792 and then Scope (Entity (Discrim)) = Etype (Typ)
10794 D := First_Discriminant (Etype (Typ));
10795 E := First_Elmt (Constraints);
10796 while Present (D) loop
10797 if D = Entity (Discrim) then
10801 Next_Discriminant (D);
10806 -- Something is wrong if we did not find the value
10808 raise Program_Error;
10809 end Get_Discr_Value;
10811 ---------------------
10812 -- Is_Discriminant --
10813 ---------------------
10815 function Is_Discriminant (Expr : Node_Id) return Boolean is
10816 Discrim_Scope : Entity_Id;
10819 if Denotes_Discriminant (Expr) then
10820 Discrim_Scope := Scope (Entity (Expr));
10822 -- Either we have a reference to one of Typ's discriminants,
10824 pragma Assert (Discrim_Scope = Typ
10826 -- or to the discriminants of the parent type, in the case
10827 -- of a derivation of a tagged type with variants.
10829 or else Discrim_Scope = Etype (Typ)
10830 or else Full_View (Discrim_Scope) = Etype (Typ)
10832 -- or same as above for the case where the discriminants
10833 -- were declared in Typ's private view.
10835 or else (Is_Private_Type (Discrim_Scope)
10836 and then Chars (Discrim_Scope) = Chars (Typ))
10838 -- or else we are deriving from the full view and the
10839 -- discriminant is declared in the private entity.
10841 or else (Is_Private_Type (Typ)
10842 and then Chars (Discrim_Scope) = Chars (Typ))
10844 -- Or we are constrained the corresponding record of a
10845 -- synchronized type that completes a private declaration.
10847 or else (Is_Concurrent_Record_Type (Typ)
10849 Corresponding_Concurrent_Type (Typ) = Discrim_Scope)
10851 -- or we have a class-wide type, in which case make sure the
10852 -- discriminant found belongs to the root type.
10854 or else (Is_Class_Wide_Type (Typ)
10855 and then Etype (Typ) = Discrim_Scope));
10860 -- In all other cases we have something wrong
10863 end Is_Discriminant;
10865 -- Start of processing for Constrain_Component_Type
10868 if Nkind (Parent (Comp)) = N_Component_Declaration
10869 and then Comes_From_Source (Parent (Comp))
10870 and then Comes_From_Source
10871 (Subtype_Indication (Component_Definition (Parent (Comp))))
10874 (Subtype_Indication (Component_Definition (Parent (Comp))))
10876 return Compon_Type;
10878 elsif Is_Array_Type (Compon_Type) then
10879 return Build_Constrained_Array_Type (Compon_Type);
10881 elsif Has_Discriminants (Compon_Type) then
10882 return Build_Constrained_Discriminated_Type (Compon_Type);
10884 elsif Is_Access_Type (Compon_Type) then
10885 return Build_Constrained_Access_Type (Compon_Type);
10888 return Compon_Type;
10890 end Constrain_Component_Type;
10892 --------------------------
10893 -- Constrain_Concurrent --
10894 --------------------------
10896 -- For concurrent types, the associated record value type carries the same
10897 -- discriminants, so when we constrain a concurrent type, we must constrain
10898 -- the corresponding record type as well.
10900 procedure Constrain_Concurrent
10901 (Def_Id : in out Entity_Id;
10903 Related_Nod : Node_Id;
10904 Related_Id : Entity_Id;
10905 Suffix : Character)
10907 T_Ent : Entity_Id := Entity (Subtype_Mark (SI));
10911 if Ekind (T_Ent) in Access_Kind then
10912 T_Ent := Designated_Type (T_Ent);
10915 T_Val := Corresponding_Record_Type (T_Ent);
10917 if Present (T_Val) then
10919 if No (Def_Id) then
10920 Def_Id := Create_Itype (E_Void, Related_Nod, Related_Id, Suffix);
10923 Constrain_Discriminated_Type (Def_Id, SI, Related_Nod);
10925 Set_Depends_On_Private (Def_Id, Has_Private_Component (Def_Id));
10926 Set_Corresponding_Record_Type (Def_Id,
10927 Constrain_Corresponding_Record
10928 (Def_Id, T_Val, Related_Nod, Related_Id));
10931 -- If there is no associated record, expansion is disabled and this
10932 -- is a generic context. Create a subtype in any case, so that
10933 -- semantic analysis can proceed.
10935 if No (Def_Id) then
10936 Def_Id := Create_Itype (E_Void, Related_Nod, Related_Id, Suffix);
10939 Constrain_Discriminated_Type (Def_Id, SI, Related_Nod);
10941 end Constrain_Concurrent;
10943 ------------------------------------
10944 -- Constrain_Corresponding_Record --
10945 ------------------------------------
10947 function Constrain_Corresponding_Record
10948 (Prot_Subt : Entity_Id;
10949 Corr_Rec : Entity_Id;
10950 Related_Nod : Node_Id;
10951 Related_Id : Entity_Id) return Entity_Id
10953 T_Sub : constant Entity_Id :=
10954 Create_Itype (E_Record_Subtype, Related_Nod, Related_Id, 'V');
10957 Set_Etype (T_Sub, Corr_Rec);
10958 Set_Has_Discriminants (T_Sub, Has_Discriminants (Prot_Subt));
10959 Set_Is_Constrained (T_Sub, True);
10960 Set_First_Entity (T_Sub, First_Entity (Corr_Rec));
10961 Set_Last_Entity (T_Sub, Last_Entity (Corr_Rec));
10963 -- As elsewhere, we do not want to create a freeze node for this itype
10964 -- if it is created for a constrained component of an enclosing record
10965 -- because references to outer discriminants will appear out of scope.
10967 if Ekind (Scope (Prot_Subt)) /= E_Record_Type then
10968 Conditional_Delay (T_Sub, Corr_Rec);
10970 Set_Is_Frozen (T_Sub);
10973 if Has_Discriminants (Prot_Subt) then -- False only if errors.
10974 Set_Discriminant_Constraint
10975 (T_Sub, Discriminant_Constraint (Prot_Subt));
10976 Set_Stored_Constraint_From_Discriminant_Constraint (T_Sub);
10977 Create_Constrained_Components
10978 (T_Sub, Related_Nod, Corr_Rec, Discriminant_Constraint (T_Sub));
10981 Set_Depends_On_Private (T_Sub, Has_Private_Component (T_Sub));
10984 end Constrain_Corresponding_Record;
10986 -----------------------
10987 -- Constrain_Decimal --
10988 -----------------------
10990 procedure Constrain_Decimal (Def_Id : Node_Id; S : Node_Id) is
10991 T : constant Entity_Id := Entity (Subtype_Mark (S));
10992 C : constant Node_Id := Constraint (S);
10993 Loc : constant Source_Ptr := Sloc (C);
10994 Range_Expr : Node_Id;
10995 Digits_Expr : Node_Id;
11000 Set_Ekind (Def_Id, E_Decimal_Fixed_Point_Subtype);
11002 if Nkind (C) = N_Range_Constraint then
11003 Range_Expr := Range_Expression (C);
11004 Digits_Val := Digits_Value (T);
11007 pragma Assert (Nkind (C) = N_Digits_Constraint);
11008 Digits_Expr := Digits_Expression (C);
11009 Analyze_And_Resolve (Digits_Expr, Any_Integer);
11011 Check_Digits_Expression (Digits_Expr);
11012 Digits_Val := Expr_Value (Digits_Expr);
11014 if Digits_Val > Digits_Value (T) then
11016 ("digits expression is incompatible with subtype", C);
11017 Digits_Val := Digits_Value (T);
11020 if Present (Range_Constraint (C)) then
11021 Range_Expr := Range_Expression (Range_Constraint (C));
11023 Range_Expr := Empty;
11027 Set_Etype (Def_Id, Base_Type (T));
11028 Set_Size_Info (Def_Id, (T));
11029 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11030 Set_Delta_Value (Def_Id, Delta_Value (T));
11031 Set_Scale_Value (Def_Id, Scale_Value (T));
11032 Set_Small_Value (Def_Id, Small_Value (T));
11033 Set_Machine_Radix_10 (Def_Id, Machine_Radix_10 (T));
11034 Set_Digits_Value (Def_Id, Digits_Val);
11036 -- Manufacture range from given digits value if no range present
11038 if No (Range_Expr) then
11039 Bound_Val := (Ureal_10 ** Digits_Val - Ureal_1) * Small_Value (T);
11043 Convert_To (T, Make_Real_Literal (Loc, (-Bound_Val))),
11045 Convert_To (T, Make_Real_Literal (Loc, Bound_Val)));
11048 Set_Scalar_Range_For_Subtype (Def_Id, Range_Expr, T);
11049 Set_Discrete_RM_Size (Def_Id);
11051 -- Unconditionally delay the freeze, since we cannot set size
11052 -- information in all cases correctly until the freeze point.
11054 Set_Has_Delayed_Freeze (Def_Id);
11055 end Constrain_Decimal;
11057 ----------------------------------
11058 -- Constrain_Discriminated_Type --
11059 ----------------------------------
11061 procedure Constrain_Discriminated_Type
11062 (Def_Id : Entity_Id;
11064 Related_Nod : Node_Id;
11065 For_Access : Boolean := False)
11067 E : constant Entity_Id := Entity (Subtype_Mark (S));
11070 Elist : Elist_Id := New_Elmt_List;
11072 procedure Fixup_Bad_Constraint;
11073 -- This is called after finding a bad constraint, and after having
11074 -- posted an appropriate error message. The mission is to leave the
11075 -- entity T in as reasonable state as possible!
11077 --------------------------
11078 -- Fixup_Bad_Constraint --
11079 --------------------------
11081 procedure Fixup_Bad_Constraint is
11083 -- Set a reasonable Ekind for the entity. For an incomplete type,
11084 -- we can't do much, but for other types, we can set the proper
11085 -- corresponding subtype kind.
11087 if Ekind (T) = E_Incomplete_Type then
11088 Set_Ekind (Def_Id, Ekind (T));
11090 Set_Ekind (Def_Id, Subtype_Kind (Ekind (T)));
11093 -- Set Etype to the known type, to reduce chances of cascaded errors
11095 Set_Etype (Def_Id, E);
11096 Set_Error_Posted (Def_Id);
11097 end Fixup_Bad_Constraint;
11099 -- Start of processing for Constrain_Discriminated_Type
11102 C := Constraint (S);
11104 -- A discriminant constraint is only allowed in a subtype indication,
11105 -- after a subtype mark. This subtype mark must denote either a type
11106 -- with discriminants, or an access type whose designated type is a
11107 -- type with discriminants. A discriminant constraint specifies the
11108 -- values of these discriminants (RM 3.7.2(5)).
11110 T := Base_Type (Entity (Subtype_Mark (S)));
11112 if Ekind (T) in Access_Kind then
11113 T := Designated_Type (T);
11116 -- Ada 2005 (AI-412): Constrained incomplete subtypes are illegal.
11117 -- Avoid generating an error for access-to-incomplete subtypes.
11119 if Ada_Version >= Ada_2005
11120 and then Ekind (T) = E_Incomplete_Type
11121 and then Nkind (Parent (S)) = N_Subtype_Declaration
11122 and then not Is_Itype (Def_Id)
11124 -- A little sanity check, emit an error message if the type
11125 -- has discriminants to begin with. Type T may be a regular
11126 -- incomplete type or imported via a limited with clause.
11128 if Has_Discriminants (T)
11130 (From_With_Type (T)
11131 and then Present (Non_Limited_View (T))
11132 and then Nkind (Parent (Non_Limited_View (T))) =
11133 N_Full_Type_Declaration
11134 and then Present (Discriminant_Specifications
11135 (Parent (Non_Limited_View (T)))))
11138 ("(Ada 2005) incomplete subtype may not be constrained", C);
11140 Error_Msg_N ("invalid constraint: type has no discriminant", C);
11143 Fixup_Bad_Constraint;
11146 -- Check that the type has visible discriminants. The type may be
11147 -- a private type with unknown discriminants whose full view has
11148 -- discriminants which are invisible.
11150 elsif not Has_Discriminants (T)
11152 (Has_Unknown_Discriminants (T)
11153 and then Is_Private_Type (T))
11155 Error_Msg_N ("invalid constraint: type has no discriminant", C);
11156 Fixup_Bad_Constraint;
11159 elsif Is_Constrained (E)
11160 or else (Ekind (E) = E_Class_Wide_Subtype
11161 and then Present (Discriminant_Constraint (E)))
11163 Error_Msg_N ("type is already constrained", Subtype_Mark (S));
11164 Fixup_Bad_Constraint;
11168 -- T may be an unconstrained subtype (e.g. a generic actual).
11169 -- Constraint applies to the base type.
11171 T := Base_Type (T);
11173 Elist := Build_Discriminant_Constraints (T, S);
11175 -- If the list returned was empty we had an error in building the
11176 -- discriminant constraint. We have also already signalled an error
11177 -- in the incomplete type case
11179 if Is_Empty_Elmt_List (Elist) then
11180 Fixup_Bad_Constraint;
11184 Build_Discriminated_Subtype (T, Def_Id, Elist, Related_Nod, For_Access);
11185 end Constrain_Discriminated_Type;
11187 ---------------------------
11188 -- Constrain_Enumeration --
11189 ---------------------------
11191 procedure Constrain_Enumeration (Def_Id : Node_Id; S : Node_Id) is
11192 T : constant Entity_Id := Entity (Subtype_Mark (S));
11193 C : constant Node_Id := Constraint (S);
11196 Set_Ekind (Def_Id, E_Enumeration_Subtype);
11198 Set_First_Literal (Def_Id, First_Literal (Base_Type (T)));
11200 Set_Etype (Def_Id, Base_Type (T));
11201 Set_Size_Info (Def_Id, (T));
11202 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11203 Set_Is_Character_Type (Def_Id, Is_Character_Type (T));
11205 Set_Scalar_Range_For_Subtype (Def_Id, Range_Expression (C), T);
11207 Set_Discrete_RM_Size (Def_Id);
11208 end Constrain_Enumeration;
11210 ----------------------
11211 -- Constrain_Float --
11212 ----------------------
11214 procedure Constrain_Float (Def_Id : Node_Id; S : Node_Id) is
11215 T : constant Entity_Id := Entity (Subtype_Mark (S));
11221 Set_Ekind (Def_Id, E_Floating_Point_Subtype);
11223 Set_Etype (Def_Id, Base_Type (T));
11224 Set_Size_Info (Def_Id, (T));
11225 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11227 -- Process the constraint
11229 C := Constraint (S);
11231 -- Digits constraint present
11233 if Nkind (C) = N_Digits_Constraint then
11234 Check_Restriction (No_Obsolescent_Features, C);
11236 if Warn_On_Obsolescent_Feature then
11238 ("subtype digits constraint is an " &
11239 "obsolescent feature (RM J.3(8))?", C);
11242 D := Digits_Expression (C);
11243 Analyze_And_Resolve (D, Any_Integer);
11244 Check_Digits_Expression (D);
11245 Set_Digits_Value (Def_Id, Expr_Value (D));
11247 -- Check that digits value is in range. Obviously we can do this
11248 -- at compile time, but it is strictly a runtime check, and of
11249 -- course there is an ACVC test that checks this!
11251 if Digits_Value (Def_Id) > Digits_Value (T) then
11252 Error_Msg_Uint_1 := Digits_Value (T);
11253 Error_Msg_N ("?digits value is too large, maximum is ^", D);
11255 Make_Raise_Constraint_Error (Sloc (D),
11256 Reason => CE_Range_Check_Failed);
11257 Insert_Action (Declaration_Node (Def_Id), Rais);
11260 C := Range_Constraint (C);
11262 -- No digits constraint present
11265 Set_Digits_Value (Def_Id, Digits_Value (T));
11268 -- Range constraint present
11270 if Nkind (C) = N_Range_Constraint then
11271 Set_Scalar_Range_For_Subtype (Def_Id, Range_Expression (C), T);
11273 -- No range constraint present
11276 pragma Assert (No (C));
11277 Set_Scalar_Range (Def_Id, Scalar_Range (T));
11280 Set_Is_Constrained (Def_Id);
11281 end Constrain_Float;
11283 ---------------------
11284 -- Constrain_Index --
11285 ---------------------
11287 procedure Constrain_Index
11290 Related_Nod : Node_Id;
11291 Related_Id : Entity_Id;
11292 Suffix : Character;
11293 Suffix_Index : Nat)
11295 Def_Id : Entity_Id;
11296 R : Node_Id := Empty;
11297 T : constant Entity_Id := Etype (Index);
11300 if Nkind (S) = N_Range
11302 (Nkind (S) = N_Attribute_Reference
11303 and then Attribute_Name (S) = Name_Range)
11305 -- A Range attribute will transformed into N_Range by Resolve
11311 Process_Range_Expr_In_Decl (R, T, Empty_List);
11313 if not Error_Posted (S)
11315 (Nkind (S) /= N_Range
11316 or else not Covers (T, (Etype (Low_Bound (S))))
11317 or else not Covers (T, (Etype (High_Bound (S)))))
11319 if Base_Type (T) /= Any_Type
11320 and then Etype (Low_Bound (S)) /= Any_Type
11321 and then Etype (High_Bound (S)) /= Any_Type
11323 Error_Msg_N ("range expected", S);
11327 elsif Nkind (S) = N_Subtype_Indication then
11329 -- The parser has verified that this is a discrete indication
11331 Resolve_Discrete_Subtype_Indication (S, T);
11332 R := Range_Expression (Constraint (S));
11334 elsif Nkind (S) = N_Discriminant_Association then
11336 -- Syntactically valid in subtype indication
11338 Error_Msg_N ("invalid index constraint", S);
11339 Rewrite (S, New_Occurrence_Of (T, Sloc (S)));
11342 -- Subtype_Mark case, no anonymous subtypes to construct
11347 if Is_Entity_Name (S) then
11348 if not Is_Type (Entity (S)) then
11349 Error_Msg_N ("expect subtype mark for index constraint", S);
11351 elsif Base_Type (Entity (S)) /= Base_Type (T) then
11352 Wrong_Type (S, Base_Type (T));
11354 -- Check error of subtype with predicate in index constraint
11356 elsif Has_Predicates (Entity (S)) then
11358 ("subtype& has predicate, not allowed in index consraint",
11365 Error_Msg_N ("invalid index constraint", S);
11366 Rewrite (S, New_Occurrence_Of (T, Sloc (S)));
11372 Create_Itype (E_Void, Related_Nod, Related_Id, Suffix, Suffix_Index);
11374 Set_Etype (Def_Id, Base_Type (T));
11376 if Is_Modular_Integer_Type (T) then
11377 Set_Ekind (Def_Id, E_Modular_Integer_Subtype);
11379 elsif Is_Integer_Type (T) then
11380 Set_Ekind (Def_Id, E_Signed_Integer_Subtype);
11383 Set_Ekind (Def_Id, E_Enumeration_Subtype);
11384 Set_Is_Character_Type (Def_Id, Is_Character_Type (T));
11385 Set_First_Literal (Def_Id, First_Literal (T));
11388 Set_Size_Info (Def_Id, (T));
11389 Set_RM_Size (Def_Id, RM_Size (T));
11390 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11392 Set_Scalar_Range (Def_Id, R);
11394 Set_Etype (S, Def_Id);
11395 Set_Discrete_RM_Size (Def_Id);
11396 end Constrain_Index;
11398 -----------------------
11399 -- Constrain_Integer --
11400 -----------------------
11402 procedure Constrain_Integer (Def_Id : Node_Id; S : Node_Id) is
11403 T : constant Entity_Id := Entity (Subtype_Mark (S));
11404 C : constant Node_Id := Constraint (S);
11407 Set_Scalar_Range_For_Subtype (Def_Id, Range_Expression (C), T);
11409 if Is_Modular_Integer_Type (T) then
11410 Set_Ekind (Def_Id, E_Modular_Integer_Subtype);
11412 Set_Ekind (Def_Id, E_Signed_Integer_Subtype);
11415 Set_Etype (Def_Id, Base_Type (T));
11416 Set_Size_Info (Def_Id, (T));
11417 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11418 Set_Discrete_RM_Size (Def_Id);
11419 end Constrain_Integer;
11421 ------------------------------
11422 -- Constrain_Ordinary_Fixed --
11423 ------------------------------
11425 procedure Constrain_Ordinary_Fixed (Def_Id : Node_Id; S : Node_Id) is
11426 T : constant Entity_Id := Entity (Subtype_Mark (S));
11432 Set_Ekind (Def_Id, E_Ordinary_Fixed_Point_Subtype);
11433 Set_Etype (Def_Id, Base_Type (T));
11434 Set_Size_Info (Def_Id, (T));
11435 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
11436 Set_Small_Value (Def_Id, Small_Value (T));
11438 -- Process the constraint
11440 C := Constraint (S);
11442 -- Delta constraint present
11444 if Nkind (C) = N_Delta_Constraint then
11445 Check_Restriction (No_Obsolescent_Features, C);
11447 if Warn_On_Obsolescent_Feature then
11449 ("subtype delta constraint is an " &
11450 "obsolescent feature (RM J.3(7))?");
11453 D := Delta_Expression (C);
11454 Analyze_And_Resolve (D, Any_Real);
11455 Check_Delta_Expression (D);
11456 Set_Delta_Value (Def_Id, Expr_Value_R (D));
11458 -- Check that delta value is in range. Obviously we can do this
11459 -- at compile time, but it is strictly a runtime check, and of
11460 -- course there is an ACVC test that checks this!
11462 if Delta_Value (Def_Id) < Delta_Value (T) then
11463 Error_Msg_N ("?delta value is too small", D);
11465 Make_Raise_Constraint_Error (Sloc (D),
11466 Reason => CE_Range_Check_Failed);
11467 Insert_Action (Declaration_Node (Def_Id), Rais);
11470 C := Range_Constraint (C);
11472 -- No delta constraint present
11475 Set_Delta_Value (Def_Id, Delta_Value (T));
11478 -- Range constraint present
11480 if Nkind (C) = N_Range_Constraint then
11481 Set_Scalar_Range_For_Subtype (Def_Id, Range_Expression (C), T);
11483 -- No range constraint present
11486 pragma Assert (No (C));
11487 Set_Scalar_Range (Def_Id, Scalar_Range (T));
11491 Set_Discrete_RM_Size (Def_Id);
11493 -- Unconditionally delay the freeze, since we cannot set size
11494 -- information in all cases correctly until the freeze point.
11496 Set_Has_Delayed_Freeze (Def_Id);
11497 end Constrain_Ordinary_Fixed;
11499 -----------------------
11500 -- Contain_Interface --
11501 -----------------------
11503 function Contain_Interface
11504 (Iface : Entity_Id;
11505 Ifaces : Elist_Id) return Boolean
11507 Iface_Elmt : Elmt_Id;
11510 if Present (Ifaces) then
11511 Iface_Elmt := First_Elmt (Ifaces);
11512 while Present (Iface_Elmt) loop
11513 if Node (Iface_Elmt) = Iface then
11517 Next_Elmt (Iface_Elmt);
11522 end Contain_Interface;
11524 ---------------------------
11525 -- Convert_Scalar_Bounds --
11526 ---------------------------
11528 procedure Convert_Scalar_Bounds
11530 Parent_Type : Entity_Id;
11531 Derived_Type : Entity_Id;
11534 Implicit_Base : constant Entity_Id := Base_Type (Derived_Type);
11541 -- Defend against previous errors
11543 if No (Scalar_Range (Derived_Type)) then
11547 Lo := Build_Scalar_Bound
11548 (Type_Low_Bound (Derived_Type),
11549 Parent_Type, Implicit_Base);
11551 Hi := Build_Scalar_Bound
11552 (Type_High_Bound (Derived_Type),
11553 Parent_Type, Implicit_Base);
11560 Set_Includes_Infinities (Rng, Has_Infinities (Derived_Type));
11562 Set_Parent (Rng, N);
11563 Set_Scalar_Range (Derived_Type, Rng);
11565 -- Analyze the bounds
11567 Analyze_And_Resolve (Lo, Implicit_Base);
11568 Analyze_And_Resolve (Hi, Implicit_Base);
11570 -- Analyze the range itself, except that we do not analyze it if
11571 -- the bounds are real literals, and we have a fixed-point type.
11572 -- The reason for this is that we delay setting the bounds in this
11573 -- case till we know the final Small and Size values (see circuit
11574 -- in Freeze.Freeze_Fixed_Point_Type for further details).
11576 if Is_Fixed_Point_Type (Parent_Type)
11577 and then Nkind (Lo) = N_Real_Literal
11578 and then Nkind (Hi) = N_Real_Literal
11582 -- Here we do the analysis of the range
11584 -- Note: we do this manually, since if we do a normal Analyze and
11585 -- Resolve call, there are problems with the conversions used for
11586 -- the derived type range.
11589 Set_Etype (Rng, Implicit_Base);
11590 Set_Analyzed (Rng, True);
11592 end Convert_Scalar_Bounds;
11594 -------------------
11595 -- Copy_And_Swap --
11596 -------------------
11598 procedure Copy_And_Swap (Priv, Full : Entity_Id) is
11600 -- Initialize new full declaration entity by copying the pertinent
11601 -- fields of the corresponding private declaration entity.
11603 -- We temporarily set Ekind to a value appropriate for a type to
11604 -- avoid assert failures in Einfo from checking for setting type
11605 -- attributes on something that is not a type. Ekind (Priv) is an
11606 -- appropriate choice, since it allowed the attributes to be set
11607 -- in the first place. This Ekind value will be modified later.
11609 Set_Ekind (Full, Ekind (Priv));
11611 -- Also set Etype temporarily to Any_Type, again, in the absence
11612 -- of errors, it will be properly reset, and if there are errors,
11613 -- then we want a value of Any_Type to remain.
11615 Set_Etype (Full, Any_Type);
11617 -- Now start copying attributes
11619 Set_Has_Discriminants (Full, Has_Discriminants (Priv));
11621 if Has_Discriminants (Full) then
11622 Set_Discriminant_Constraint (Full, Discriminant_Constraint (Priv));
11623 Set_Stored_Constraint (Full, Stored_Constraint (Priv));
11626 Set_First_Rep_Item (Full, First_Rep_Item (Priv));
11627 Set_Homonym (Full, Homonym (Priv));
11628 Set_Is_Immediately_Visible (Full, Is_Immediately_Visible (Priv));
11629 Set_Is_Public (Full, Is_Public (Priv));
11630 Set_Is_Pure (Full, Is_Pure (Priv));
11631 Set_Is_Tagged_Type (Full, Is_Tagged_Type (Priv));
11632 Set_Has_Pragma_Unmodified (Full, Has_Pragma_Unmodified (Priv));
11633 Set_Has_Pragma_Unreferenced (Full, Has_Pragma_Unreferenced (Priv));
11634 Set_Has_Pragma_Unreferenced_Objects
11635 (Full, Has_Pragma_Unreferenced_Objects
11638 Conditional_Delay (Full, Priv);
11640 if Is_Tagged_Type (Full) then
11641 Set_Direct_Primitive_Operations (Full,
11642 Direct_Primitive_Operations (Priv));
11644 if Priv = Base_Type (Priv) then
11645 Set_Class_Wide_Type (Full, Class_Wide_Type (Priv));
11649 Set_Is_Volatile (Full, Is_Volatile (Priv));
11650 Set_Treat_As_Volatile (Full, Treat_As_Volatile (Priv));
11651 Set_Scope (Full, Scope (Priv));
11652 Set_Next_Entity (Full, Next_Entity (Priv));
11653 Set_First_Entity (Full, First_Entity (Priv));
11654 Set_Last_Entity (Full, Last_Entity (Priv));
11656 -- If access types have been recorded for later handling, keep them in
11657 -- the full view so that they get handled when the full view freeze
11658 -- node is expanded.
11660 if Present (Freeze_Node (Priv))
11661 and then Present (Access_Types_To_Process (Freeze_Node (Priv)))
11663 Ensure_Freeze_Node (Full);
11664 Set_Access_Types_To_Process
11665 (Freeze_Node (Full),
11666 Access_Types_To_Process (Freeze_Node (Priv)));
11669 -- Swap the two entities. Now Privat is the full type entity and Full is
11670 -- the private one. They will be swapped back at the end of the private
11671 -- part. This swapping ensures that the entity that is visible in the
11672 -- private part is the full declaration.
11674 Exchange_Entities (Priv, Full);
11675 Append_Entity (Full, Scope (Full));
11678 -------------------------------------
11679 -- Copy_Array_Base_Type_Attributes --
11680 -------------------------------------
11682 procedure Copy_Array_Base_Type_Attributes (T1, T2 : Entity_Id) is
11684 Set_Component_Alignment (T1, Component_Alignment (T2));
11685 Set_Component_Type (T1, Component_Type (T2));
11686 Set_Component_Size (T1, Component_Size (T2));
11687 Set_Has_Controlled_Component (T1, Has_Controlled_Component (T2));
11688 Set_Finalize_Storage_Only (T1, Finalize_Storage_Only (T2));
11689 Set_Has_Non_Standard_Rep (T1, Has_Non_Standard_Rep (T2));
11690 Set_Has_Task (T1, Has_Task (T2));
11691 Set_Is_Packed (T1, Is_Packed (T2));
11692 Set_Has_Aliased_Components (T1, Has_Aliased_Components (T2));
11693 Set_Has_Atomic_Components (T1, Has_Atomic_Components (T2));
11694 Set_Has_Volatile_Components (T1, Has_Volatile_Components (T2));
11695 end Copy_Array_Base_Type_Attributes;
11697 -----------------------------------
11698 -- Copy_Array_Subtype_Attributes --
11699 -----------------------------------
11701 procedure Copy_Array_Subtype_Attributes (T1, T2 : Entity_Id) is
11703 Set_Size_Info (T1, T2);
11705 Set_First_Index (T1, First_Index (T2));
11706 Set_Is_Aliased (T1, Is_Aliased (T2));
11707 Set_Is_Atomic (T1, Is_Atomic (T2));
11708 Set_Is_Volatile (T1, Is_Volatile (T2));
11709 Set_Treat_As_Volatile (T1, Treat_As_Volatile (T2));
11710 Set_Is_Constrained (T1, Is_Constrained (T2));
11711 Set_Depends_On_Private (T1, Has_Private_Component (T2));
11712 Set_First_Rep_Item (T1, First_Rep_Item (T2));
11713 Set_Convention (T1, Convention (T2));
11714 Set_Is_Limited_Composite (T1, Is_Limited_Composite (T2));
11715 Set_Is_Private_Composite (T1, Is_Private_Composite (T2));
11716 Set_Packed_Array_Type (T1, Packed_Array_Type (T2));
11717 end Copy_Array_Subtype_Attributes;
11719 -----------------------------------
11720 -- Create_Constrained_Components --
11721 -----------------------------------
11723 procedure Create_Constrained_Components
11725 Decl_Node : Node_Id;
11727 Constraints : Elist_Id)
11729 Loc : constant Source_Ptr := Sloc (Subt);
11730 Comp_List : constant Elist_Id := New_Elmt_List;
11731 Parent_Type : constant Entity_Id := Etype (Typ);
11732 Assoc_List : constant List_Id := New_List;
11733 Discr_Val : Elmt_Id;
11737 Is_Static : Boolean := True;
11739 procedure Collect_Fixed_Components (Typ : Entity_Id);
11740 -- Collect parent type components that do not appear in a variant part
11742 procedure Create_All_Components;
11743 -- Iterate over Comp_List to create the components of the subtype
11745 function Create_Component (Old_Compon : Entity_Id) return Entity_Id;
11746 -- Creates a new component from Old_Compon, copying all the fields from
11747 -- it, including its Etype, inserts the new component in the Subt entity
11748 -- chain and returns the new component.
11750 function Is_Variant_Record (T : Entity_Id) return Boolean;
11751 -- If true, and discriminants are static, collect only components from
11752 -- variants selected by discriminant values.
11754 ------------------------------
11755 -- Collect_Fixed_Components --
11756 ------------------------------
11758 procedure Collect_Fixed_Components (Typ : Entity_Id) is
11760 -- Build association list for discriminants, and find components of the
11761 -- variant part selected by the values of the discriminants.
11763 Old_C := First_Discriminant (Typ);
11764 Discr_Val := First_Elmt (Constraints);
11765 while Present (Old_C) loop
11766 Append_To (Assoc_List,
11767 Make_Component_Association (Loc,
11768 Choices => New_List (New_Occurrence_Of (Old_C, Loc)),
11769 Expression => New_Copy (Node (Discr_Val))));
11771 Next_Elmt (Discr_Val);
11772 Next_Discriminant (Old_C);
11775 -- The tag, and the possible parent and controller components
11776 -- are unconditionally in the subtype.
11778 if Is_Tagged_Type (Typ)
11779 or else Has_Controlled_Component (Typ)
11781 Old_C := First_Component (Typ);
11782 while Present (Old_C) loop
11783 if Chars ((Old_C)) = Name_uTag
11784 or else Chars ((Old_C)) = Name_uParent
11785 or else Chars ((Old_C)) = Name_uController
11787 Append_Elmt (Old_C, Comp_List);
11790 Next_Component (Old_C);
11793 end Collect_Fixed_Components;
11795 ---------------------------
11796 -- Create_All_Components --
11797 ---------------------------
11799 procedure Create_All_Components is
11803 Comp := First_Elmt (Comp_List);
11804 while Present (Comp) loop
11805 Old_C := Node (Comp);
11806 New_C := Create_Component (Old_C);
11810 Constrain_Component_Type
11811 (Old_C, Subt, Decl_Node, Typ, Constraints));
11812 Set_Is_Public (New_C, Is_Public (Subt));
11816 end Create_All_Components;
11818 ----------------------
11819 -- Create_Component --
11820 ----------------------
11822 function Create_Component (Old_Compon : Entity_Id) return Entity_Id is
11823 New_Compon : constant Entity_Id := New_Copy (Old_Compon);
11826 if Ekind (Old_Compon) = E_Discriminant
11827 and then Is_Completely_Hidden (Old_Compon)
11829 -- This is a shadow discriminant created for a discriminant of
11830 -- the parent type, which needs to be present in the subtype.
11831 -- Give the shadow discriminant an internal name that cannot
11832 -- conflict with that of visible components.
11834 Set_Chars (New_Compon, New_Internal_Name ('C'));
11837 -- Set the parent so we have a proper link for freezing etc. This is
11838 -- not a real parent pointer, since of course our parent does not own
11839 -- up to us and reference us, we are an illegitimate child of the
11840 -- original parent!
11842 Set_Parent (New_Compon, Parent (Old_Compon));
11844 -- If the old component's Esize was already determined and is a
11845 -- static value, then the new component simply inherits it. Otherwise
11846 -- the old component's size may require run-time determination, but
11847 -- the new component's size still might be statically determinable
11848 -- (if, for example it has a static constraint). In that case we want
11849 -- Layout_Type to recompute the component's size, so we reset its
11850 -- size and positional fields.
11852 if Frontend_Layout_On_Target
11853 and then not Known_Static_Esize (Old_Compon)
11855 Set_Esize (New_Compon, Uint_0);
11856 Init_Normalized_First_Bit (New_Compon);
11857 Init_Normalized_Position (New_Compon);
11858 Init_Normalized_Position_Max (New_Compon);
11861 -- We do not want this node marked as Comes_From_Source, since
11862 -- otherwise it would get first class status and a separate cross-
11863 -- reference line would be generated. Illegitimate children do not
11864 -- rate such recognition.
11866 Set_Comes_From_Source (New_Compon, False);
11868 -- But it is a real entity, and a birth certificate must be properly
11869 -- registered by entering it into the entity list.
11871 Enter_Name (New_Compon);
11874 end Create_Component;
11876 -----------------------
11877 -- Is_Variant_Record --
11878 -----------------------
11880 function Is_Variant_Record (T : Entity_Id) return Boolean is
11882 return Nkind (Parent (T)) = N_Full_Type_Declaration
11883 and then Nkind (Type_Definition (Parent (T))) = N_Record_Definition
11884 and then Present (Component_List (Type_Definition (Parent (T))))
11887 (Variant_Part (Component_List (Type_Definition (Parent (T)))));
11888 end Is_Variant_Record;
11890 -- Start of processing for Create_Constrained_Components
11893 pragma Assert (Subt /= Base_Type (Subt));
11894 pragma Assert (Typ = Base_Type (Typ));
11896 Set_First_Entity (Subt, Empty);
11897 Set_Last_Entity (Subt, Empty);
11899 -- Check whether constraint is fully static, in which case we can
11900 -- optimize the list of components.
11902 Discr_Val := First_Elmt (Constraints);
11903 while Present (Discr_Val) loop
11904 if not Is_OK_Static_Expression (Node (Discr_Val)) then
11905 Is_Static := False;
11909 Next_Elmt (Discr_Val);
11912 Set_Has_Static_Discriminants (Subt, Is_Static);
11916 -- Inherit the discriminants of the parent type
11918 Add_Discriminants : declare
11924 Old_C := First_Discriminant (Typ);
11926 while Present (Old_C) loop
11927 Num_Disc := Num_Disc + 1;
11928 New_C := Create_Component (Old_C);
11929 Set_Is_Public (New_C, Is_Public (Subt));
11930 Next_Discriminant (Old_C);
11933 -- For an untagged derived subtype, the number of discriminants may
11934 -- be smaller than the number of inherited discriminants, because
11935 -- several of them may be renamed by a single new discriminant or
11936 -- constrained. In this case, add the hidden discriminants back into
11937 -- the subtype, because they need to be present if the optimizer of
11938 -- the GCC 4.x back-end decides to break apart assignments between
11939 -- objects using the parent view into member-wise assignments.
11943 if Is_Derived_Type (Typ)
11944 and then not Is_Tagged_Type (Typ)
11946 Old_C := First_Stored_Discriminant (Typ);
11948 while Present (Old_C) loop
11949 Num_Gird := Num_Gird + 1;
11950 Next_Stored_Discriminant (Old_C);
11954 if Num_Gird > Num_Disc then
11956 -- Find out multiple uses of new discriminants, and add hidden
11957 -- components for the extra renamed discriminants. We recognize
11958 -- multiple uses through the Corresponding_Discriminant of a
11959 -- new discriminant: if it constrains several old discriminants,
11960 -- this field points to the last one in the parent type. The
11961 -- stored discriminants of the derived type have the same name
11962 -- as those of the parent.
11966 New_Discr : Entity_Id;
11967 Old_Discr : Entity_Id;
11970 Constr := First_Elmt (Stored_Constraint (Typ));
11971 Old_Discr := First_Stored_Discriminant (Typ);
11972 while Present (Constr) loop
11973 if Is_Entity_Name (Node (Constr))
11974 and then Ekind (Entity (Node (Constr))) = E_Discriminant
11976 New_Discr := Entity (Node (Constr));
11978 if Chars (Corresponding_Discriminant (New_Discr)) /=
11981 -- The new discriminant has been used to rename a
11982 -- subsequent old discriminant. Introduce a shadow
11983 -- component for the current old discriminant.
11985 New_C := Create_Component (Old_Discr);
11986 Set_Original_Record_Component (New_C, Old_Discr);
11990 -- The constraint has eliminated the old discriminant.
11991 -- Introduce a shadow component.
11993 New_C := Create_Component (Old_Discr);
11994 Set_Original_Record_Component (New_C, Old_Discr);
11997 Next_Elmt (Constr);
11998 Next_Stored_Discriminant (Old_Discr);
12002 end Add_Discriminants;
12005 and then Is_Variant_Record (Typ)
12007 Collect_Fixed_Components (Typ);
12009 Gather_Components (
12011 Component_List (Type_Definition (Parent (Typ))),
12012 Governed_By => Assoc_List,
12014 Report_Errors => Errors);
12015 pragma Assert (not Errors);
12017 Create_All_Components;
12019 -- If the subtype declaration is created for a tagged type derivation
12020 -- with constraints, we retrieve the record definition of the parent
12021 -- type to select the components of the proper variant.
12024 and then Is_Tagged_Type (Typ)
12025 and then Nkind (Parent (Typ)) = N_Full_Type_Declaration
12027 Nkind (Type_Definition (Parent (Typ))) = N_Derived_Type_Definition
12028 and then Is_Variant_Record (Parent_Type)
12030 Collect_Fixed_Components (Typ);
12032 Gather_Components (
12034 Component_List (Type_Definition (Parent (Parent_Type))),
12035 Governed_By => Assoc_List,
12037 Report_Errors => Errors);
12038 pragma Assert (not Errors);
12040 -- If the tagged derivation has a type extension, collect all the
12041 -- new components therein.
12044 (Record_Extension_Part (Type_Definition (Parent (Typ))))
12046 Old_C := First_Component (Typ);
12047 while Present (Old_C) loop
12048 if Original_Record_Component (Old_C) = Old_C
12049 and then Chars (Old_C) /= Name_uTag
12050 and then Chars (Old_C) /= Name_uParent
12051 and then Chars (Old_C) /= Name_uController
12053 Append_Elmt (Old_C, Comp_List);
12056 Next_Component (Old_C);
12060 Create_All_Components;
12063 -- If discriminants are not static, or if this is a multi-level type
12064 -- extension, we have to include all components of the parent type.
12066 Old_C := First_Component (Typ);
12067 while Present (Old_C) loop
12068 New_C := Create_Component (Old_C);
12072 Constrain_Component_Type
12073 (Old_C, Subt, Decl_Node, Typ, Constraints));
12074 Set_Is_Public (New_C, Is_Public (Subt));
12076 Next_Component (Old_C);
12081 end Create_Constrained_Components;
12083 ------------------------------------------
12084 -- Decimal_Fixed_Point_Type_Declaration --
12085 ------------------------------------------
12087 procedure Decimal_Fixed_Point_Type_Declaration
12091 Loc : constant Source_Ptr := Sloc (Def);
12092 Digs_Expr : constant Node_Id := Digits_Expression (Def);
12093 Delta_Expr : constant Node_Id := Delta_Expression (Def);
12094 Implicit_Base : Entity_Id;
12101 Check_Restriction (No_Fixed_Point, Def);
12103 -- Create implicit base type
12106 Create_Itype (E_Decimal_Fixed_Point_Type, Parent (Def), T, 'B');
12107 Set_Etype (Implicit_Base, Implicit_Base);
12109 -- Analyze and process delta expression
12111 Analyze_And_Resolve (Delta_Expr, Universal_Real);
12113 Check_Delta_Expression (Delta_Expr);
12114 Delta_Val := Expr_Value_R (Delta_Expr);
12116 -- Check delta is power of 10, and determine scale value from it
12122 Scale_Val := Uint_0;
12125 if Val < Ureal_1 then
12126 while Val < Ureal_1 loop
12127 Val := Val * Ureal_10;
12128 Scale_Val := Scale_Val + 1;
12131 if Scale_Val > 18 then
12132 Error_Msg_N ("scale exceeds maximum value of 18", Def);
12133 Scale_Val := UI_From_Int (+18);
12137 while Val > Ureal_1 loop
12138 Val := Val / Ureal_10;
12139 Scale_Val := Scale_Val - 1;
12142 if Scale_Val < -18 then
12143 Error_Msg_N ("scale is less than minimum value of -18", Def);
12144 Scale_Val := UI_From_Int (-18);
12148 if Val /= Ureal_1 then
12149 Error_Msg_N ("delta expression must be a power of 10", Def);
12150 Delta_Val := Ureal_10 ** (-Scale_Val);
12154 -- Set delta, scale and small (small = delta for decimal type)
12156 Set_Delta_Value (Implicit_Base, Delta_Val);
12157 Set_Scale_Value (Implicit_Base, Scale_Val);
12158 Set_Small_Value (Implicit_Base, Delta_Val);
12160 -- Analyze and process digits expression
12162 Analyze_And_Resolve (Digs_Expr, Any_Integer);
12163 Check_Digits_Expression (Digs_Expr);
12164 Digs_Val := Expr_Value (Digs_Expr);
12166 if Digs_Val > 18 then
12167 Digs_Val := UI_From_Int (+18);
12168 Error_Msg_N ("digits value out of range, maximum is 18", Digs_Expr);
12171 Set_Digits_Value (Implicit_Base, Digs_Val);
12172 Bound_Val := UR_From_Uint (10 ** Digs_Val - 1) * Delta_Val;
12174 -- Set range of base type from digits value for now. This will be
12175 -- expanded to represent the true underlying base range by Freeze.
12177 Set_Fixed_Range (Implicit_Base, Loc, -Bound_Val, Bound_Val);
12179 -- Note: We leave size as zero for now, size will be set at freeze
12180 -- time. We have to do this for ordinary fixed-point, because the size
12181 -- depends on the specified small, and we might as well do the same for
12182 -- decimal fixed-point.
12184 pragma Assert (Esize (Implicit_Base) = Uint_0);
12186 -- If there are bounds given in the declaration use them as the
12187 -- bounds of the first named subtype.
12189 if Present (Real_Range_Specification (Def)) then
12191 RRS : constant Node_Id := Real_Range_Specification (Def);
12192 Low : constant Node_Id := Low_Bound (RRS);
12193 High : constant Node_Id := High_Bound (RRS);
12198 Analyze_And_Resolve (Low, Any_Real);
12199 Analyze_And_Resolve (High, Any_Real);
12200 Check_Real_Bound (Low);
12201 Check_Real_Bound (High);
12202 Low_Val := Expr_Value_R (Low);
12203 High_Val := Expr_Value_R (High);
12205 if Low_Val < (-Bound_Val) then
12207 ("range low bound too small for digits value", Low);
12208 Low_Val := -Bound_Val;
12211 if High_Val > Bound_Val then
12213 ("range high bound too large for digits value", High);
12214 High_Val := Bound_Val;
12217 Set_Fixed_Range (T, Loc, Low_Val, High_Val);
12220 -- If no explicit range, use range that corresponds to given
12221 -- digits value. This will end up as the final range for the
12225 Set_Fixed_Range (T, Loc, -Bound_Val, Bound_Val);
12228 -- Complete entity for first subtype
12230 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
12231 Set_Etype (T, Implicit_Base);
12232 Set_Size_Info (T, Implicit_Base);
12233 Set_First_Rep_Item (T, First_Rep_Item (Implicit_Base));
12234 Set_Digits_Value (T, Digs_Val);
12235 Set_Delta_Value (T, Delta_Val);
12236 Set_Small_Value (T, Delta_Val);
12237 Set_Scale_Value (T, Scale_Val);
12238 Set_Is_Constrained (T);
12239 end Decimal_Fixed_Point_Type_Declaration;
12241 -----------------------------------
12242 -- Derive_Progenitor_Subprograms --
12243 -----------------------------------
12245 procedure Derive_Progenitor_Subprograms
12246 (Parent_Type : Entity_Id;
12247 Tagged_Type : Entity_Id)
12252 Iface_Elmt : Elmt_Id;
12253 Iface_Subp : Entity_Id;
12254 New_Subp : Entity_Id := Empty;
12255 Prim_Elmt : Elmt_Id;
12260 pragma Assert (Ada_Version >= Ada_2005
12261 and then Is_Record_Type (Tagged_Type)
12262 and then Is_Tagged_Type (Tagged_Type)
12263 and then Has_Interfaces (Tagged_Type));
12265 -- Step 1: Transfer to the full-view primitives associated with the
12266 -- partial-view that cover interface primitives. Conceptually this
12267 -- work should be done later by Process_Full_View; done here to
12268 -- simplify its implementation at later stages. It can be safely
12269 -- done here because interfaces must be visible in the partial and
12270 -- private view (RM 7.3(7.3/2)).
12272 -- Small optimization: This work is only required if the parent is
12273 -- abstract. If the tagged type is not abstract, it cannot have
12274 -- abstract primitives (the only entities in the list of primitives of
12275 -- non-abstract tagged types that can reference abstract primitives
12276 -- through its Alias attribute are the internal entities that have
12277 -- attribute Interface_Alias, and these entities are generated later
12278 -- by Add_Internal_Interface_Entities).
12280 if In_Private_Part (Current_Scope)
12281 and then Is_Abstract_Type (Parent_Type)
12283 Elmt := First_Elmt (Primitive_Operations (Tagged_Type));
12284 while Present (Elmt) loop
12285 Subp := Node (Elmt);
12287 -- At this stage it is not possible to have entities in the list
12288 -- of primitives that have attribute Interface_Alias
12290 pragma Assert (No (Interface_Alias (Subp)));
12292 Typ := Find_Dispatching_Type (Ultimate_Alias (Subp));
12294 if Is_Interface (Typ) then
12295 E := Find_Primitive_Covering_Interface
12296 (Tagged_Type => Tagged_Type,
12297 Iface_Prim => Subp);
12300 and then Find_Dispatching_Type (Ultimate_Alias (E)) /= Typ
12302 Replace_Elmt (Elmt, E);
12303 Remove_Homonym (Subp);
12311 -- Step 2: Add primitives of progenitors that are not implemented by
12312 -- parents of Tagged_Type
12314 if Present (Interfaces (Base_Type (Tagged_Type))) then
12315 Iface_Elmt := First_Elmt (Interfaces (Base_Type (Tagged_Type)));
12316 while Present (Iface_Elmt) loop
12317 Iface := Node (Iface_Elmt);
12319 Prim_Elmt := First_Elmt (Primitive_Operations (Iface));
12320 while Present (Prim_Elmt) loop
12321 Iface_Subp := Node (Prim_Elmt);
12323 -- Exclude derivation of predefined primitives except those
12324 -- that come from source. Required to catch declarations of
12325 -- equality operators of interfaces. For example:
12327 -- type Iface is interface;
12328 -- function "=" (Left, Right : Iface) return Boolean;
12330 if not Is_Predefined_Dispatching_Operation (Iface_Subp)
12331 or else Comes_From_Source (Iface_Subp)
12333 E := Find_Primitive_Covering_Interface
12334 (Tagged_Type => Tagged_Type,
12335 Iface_Prim => Iface_Subp);
12337 -- If not found we derive a new primitive leaving its alias
12338 -- attribute referencing the interface primitive
12342 (New_Subp, Iface_Subp, Tagged_Type, Iface);
12344 -- Propagate to the full view interface entities associated
12345 -- with the partial view
12347 elsif In_Private_Part (Current_Scope)
12348 and then Present (Alias (E))
12349 and then Alias (E) = Iface_Subp
12351 List_Containing (Parent (E)) /=
12352 Private_Declarations
12354 (Unit_Declaration_Node (Current_Scope)))
12356 Append_Elmt (E, Primitive_Operations (Tagged_Type));
12360 Next_Elmt (Prim_Elmt);
12363 Next_Elmt (Iface_Elmt);
12366 end Derive_Progenitor_Subprograms;
12368 -----------------------
12369 -- Derive_Subprogram --
12370 -----------------------
12372 procedure Derive_Subprogram
12373 (New_Subp : in out Entity_Id;
12374 Parent_Subp : Entity_Id;
12375 Derived_Type : Entity_Id;
12376 Parent_Type : Entity_Id;
12377 Actual_Subp : Entity_Id := Empty)
12379 Formal : Entity_Id;
12380 -- Formal parameter of parent primitive operation
12382 Formal_Of_Actual : Entity_Id;
12383 -- Formal parameter of actual operation, when the derivation is to
12384 -- create a renaming for a primitive operation of an actual in an
12387 New_Formal : Entity_Id;
12388 -- Formal of inherited operation
12390 Visible_Subp : Entity_Id := Parent_Subp;
12392 function Is_Private_Overriding return Boolean;
12393 -- If Subp is a private overriding of a visible operation, the inherited
12394 -- operation derives from the overridden op (even though its body is the
12395 -- overriding one) and the inherited operation is visible now. See
12396 -- sem_disp to see the full details of the handling of the overridden
12397 -- subprogram, which is removed from the list of primitive operations of
12398 -- the type. The overridden subprogram is saved locally in Visible_Subp,
12399 -- and used to diagnose abstract operations that need overriding in the
12402 procedure Replace_Type (Id, New_Id : Entity_Id);
12403 -- When the type is an anonymous access type, create a new access type
12404 -- designating the derived type.
12406 procedure Set_Derived_Name;
12407 -- This procedure sets the appropriate Chars name for New_Subp. This
12408 -- is normally just a copy of the parent name. An exception arises for
12409 -- type support subprograms, where the name is changed to reflect the
12410 -- name of the derived type, e.g. if type foo is derived from type bar,
12411 -- then a procedure barDA is derived with a name fooDA.
12413 ---------------------------
12414 -- Is_Private_Overriding --
12415 ---------------------------
12417 function Is_Private_Overriding return Boolean is
12421 -- If the parent is not a dispatching operation there is no
12422 -- need to investigate overridings
12424 if not Is_Dispatching_Operation (Parent_Subp) then
12428 -- The visible operation that is overridden is a homonym of the
12429 -- parent subprogram. We scan the homonym chain to find the one
12430 -- whose alias is the subprogram we are deriving.
12432 Prev := Current_Entity (Parent_Subp);
12433 while Present (Prev) loop
12434 if Ekind (Prev) = Ekind (Parent_Subp)
12435 and then Alias (Prev) = Parent_Subp
12436 and then Scope (Parent_Subp) = Scope (Prev)
12437 and then not Is_Hidden (Prev)
12439 Visible_Subp := Prev;
12443 Prev := Homonym (Prev);
12447 end Is_Private_Overriding;
12453 procedure Replace_Type (Id, New_Id : Entity_Id) is
12454 Acc_Type : Entity_Id;
12455 Par : constant Node_Id := Parent (Derived_Type);
12458 -- When the type is an anonymous access type, create a new access
12459 -- type designating the derived type. This itype must be elaborated
12460 -- at the point of the derivation, not on subsequent calls that may
12461 -- be out of the proper scope for Gigi, so we insert a reference to
12462 -- it after the derivation.
12464 if Ekind (Etype (Id)) = E_Anonymous_Access_Type then
12466 Desig_Typ : Entity_Id := Designated_Type (Etype (Id));
12469 if Ekind (Desig_Typ) = E_Record_Type_With_Private
12470 and then Present (Full_View (Desig_Typ))
12471 and then not Is_Private_Type (Parent_Type)
12473 Desig_Typ := Full_View (Desig_Typ);
12476 if Base_Type (Desig_Typ) = Base_Type (Parent_Type)
12478 -- Ada 2005 (AI-251): Handle also derivations of abstract
12479 -- interface primitives.
12481 or else (Is_Interface (Desig_Typ)
12482 and then not Is_Class_Wide_Type (Desig_Typ))
12484 Acc_Type := New_Copy (Etype (Id));
12485 Set_Etype (Acc_Type, Acc_Type);
12486 Set_Scope (Acc_Type, New_Subp);
12488 -- Compute size of anonymous access type
12490 if Is_Array_Type (Desig_Typ)
12491 and then not Is_Constrained (Desig_Typ)
12493 Init_Size (Acc_Type, 2 * System_Address_Size);
12495 Init_Size (Acc_Type, System_Address_Size);
12498 Init_Alignment (Acc_Type);
12499 Set_Directly_Designated_Type (Acc_Type, Derived_Type);
12501 Set_Etype (New_Id, Acc_Type);
12502 Set_Scope (New_Id, New_Subp);
12504 -- Create a reference to it
12505 Build_Itype_Reference (Acc_Type, Parent (Derived_Type));
12508 Set_Etype (New_Id, Etype (Id));
12512 elsif Base_Type (Etype (Id)) = Base_Type (Parent_Type)
12514 (Ekind (Etype (Id)) = E_Record_Type_With_Private
12515 and then Present (Full_View (Etype (Id)))
12517 Base_Type (Full_View (Etype (Id))) = Base_Type (Parent_Type))
12519 -- Constraint checks on formals are generated during expansion,
12520 -- based on the signature of the original subprogram. The bounds
12521 -- of the derived type are not relevant, and thus we can use
12522 -- the base type for the formals. However, the return type may be
12523 -- used in a context that requires that the proper static bounds
12524 -- be used (a case statement, for example) and for those cases
12525 -- we must use the derived type (first subtype), not its base.
12527 -- If the derived_type_definition has no constraints, we know that
12528 -- the derived type has the same constraints as the first subtype
12529 -- of the parent, and we can also use it rather than its base,
12530 -- which can lead to more efficient code.
12532 if Etype (Id) = Parent_Type then
12533 if Is_Scalar_Type (Parent_Type)
12535 Subtypes_Statically_Compatible (Parent_Type, Derived_Type)
12537 Set_Etype (New_Id, Derived_Type);
12539 elsif Nkind (Par) = N_Full_Type_Declaration
12541 Nkind (Type_Definition (Par)) = N_Derived_Type_Definition
12544 (Subtype_Indication (Type_Definition (Par)))
12546 Set_Etype (New_Id, Derived_Type);
12549 Set_Etype (New_Id, Base_Type (Derived_Type));
12553 Set_Etype (New_Id, Base_Type (Derived_Type));
12557 Set_Etype (New_Id, Etype (Id));
12561 ----------------------
12562 -- Set_Derived_Name --
12563 ----------------------
12565 procedure Set_Derived_Name is
12566 Nm : constant TSS_Name_Type := Get_TSS_Name (Parent_Subp);
12568 if Nm = TSS_Null then
12569 Set_Chars (New_Subp, Chars (Parent_Subp));
12571 Set_Chars (New_Subp, Make_TSS_Name (Base_Type (Derived_Type), Nm));
12573 end Set_Derived_Name;
12575 -- Start of processing for Derive_Subprogram
12579 New_Entity (Nkind (Parent_Subp), Sloc (Derived_Type));
12580 Set_Ekind (New_Subp, Ekind (Parent_Subp));
12582 -- Check whether the inherited subprogram is a private operation that
12583 -- should be inherited but not yet made visible. Such subprograms can
12584 -- become visible at a later point (e.g., the private part of a public
12585 -- child unit) via Declare_Inherited_Private_Subprograms. If the
12586 -- following predicate is true, then this is not such a private
12587 -- operation and the subprogram simply inherits the name of the parent
12588 -- subprogram. Note the special check for the names of controlled
12589 -- operations, which are currently exempted from being inherited with
12590 -- a hidden name because they must be findable for generation of
12591 -- implicit run-time calls.
12593 if not Is_Hidden (Parent_Subp)
12594 or else Is_Internal (Parent_Subp)
12595 or else Is_Private_Overriding
12596 or else Is_Internal_Name (Chars (Parent_Subp))
12597 or else Chars (Parent_Subp) = Name_Initialize
12598 or else Chars (Parent_Subp) = Name_Adjust
12599 or else Chars (Parent_Subp) = Name_Finalize
12603 -- An inherited dispatching equality will be overridden by an internally
12604 -- generated one, or by an explicit one, so preserve its name and thus
12605 -- its entry in the dispatch table. Otherwise, if Parent_Subp is a
12606 -- private operation it may become invisible if the full view has
12607 -- progenitors, and the dispatch table will be malformed.
12608 -- We check that the type is limited to handle the anomalous declaration
12609 -- of Limited_Controlled, which is derived from a non-limited type, and
12610 -- which is handled specially elsewhere as well.
12612 elsif Chars (Parent_Subp) = Name_Op_Eq
12613 and then Is_Dispatching_Operation (Parent_Subp)
12614 and then Etype (Parent_Subp) = Standard_Boolean
12615 and then not Is_Limited_Type (Etype (First_Formal (Parent_Subp)))
12617 Etype (First_Formal (Parent_Subp)) =
12618 Etype (Next_Formal (First_Formal (Parent_Subp)))
12622 -- If parent is hidden, this can be a regular derivation if the
12623 -- parent is immediately visible in a non-instantiating context,
12624 -- or if we are in the private part of an instance. This test
12625 -- should still be refined ???
12627 -- The test for In_Instance_Not_Visible avoids inheriting the derived
12628 -- operation as a non-visible operation in cases where the parent
12629 -- subprogram might not be visible now, but was visible within the
12630 -- original generic, so it would be wrong to make the inherited
12631 -- subprogram non-visible now. (Not clear if this test is fully
12632 -- correct; are there any cases where we should declare the inherited
12633 -- operation as not visible to avoid it being overridden, e.g., when
12634 -- the parent type is a generic actual with private primitives ???)
12636 -- (they should be treated the same as other private inherited
12637 -- subprograms, but it's not clear how to do this cleanly). ???
12639 elsif (In_Open_Scopes (Scope (Base_Type (Parent_Type)))
12640 and then Is_Immediately_Visible (Parent_Subp)
12641 and then not In_Instance)
12642 or else In_Instance_Not_Visible
12646 -- Ada 2005 (AI-251): Regular derivation if the parent subprogram
12647 -- overrides an interface primitive because interface primitives
12648 -- must be visible in the partial view of the parent (RM 7.3 (7.3/2))
12650 elsif Ada_Version >= Ada_2005
12651 and then Is_Dispatching_Operation (Parent_Subp)
12652 and then Covers_Some_Interface (Parent_Subp)
12656 -- Otherwise, the type is inheriting a private operation, so enter
12657 -- it with a special name so it can't be overridden.
12660 Set_Chars (New_Subp, New_External_Name (Chars (Parent_Subp), 'P'));
12663 Set_Parent (New_Subp, Parent (Derived_Type));
12665 if Present (Actual_Subp) then
12666 Replace_Type (Actual_Subp, New_Subp);
12668 Replace_Type (Parent_Subp, New_Subp);
12671 Conditional_Delay (New_Subp, Parent_Subp);
12673 -- If we are creating a renaming for a primitive operation of an
12674 -- actual of a generic derived type, we must examine the signature
12675 -- of the actual primitive, not that of the generic formal, which for
12676 -- example may be an interface. However the name and initial value
12677 -- of the inherited operation are those of the formal primitive.
12679 Formal := First_Formal (Parent_Subp);
12681 if Present (Actual_Subp) then
12682 Formal_Of_Actual := First_Formal (Actual_Subp);
12684 Formal_Of_Actual := Empty;
12687 while Present (Formal) loop
12688 New_Formal := New_Copy (Formal);
12690 -- Normally we do not go copying parents, but in the case of
12691 -- formals, we need to link up to the declaration (which is the
12692 -- parameter specification), and it is fine to link up to the
12693 -- original formal's parameter specification in this case.
12695 Set_Parent (New_Formal, Parent (Formal));
12696 Append_Entity (New_Formal, New_Subp);
12698 if Present (Formal_Of_Actual) then
12699 Replace_Type (Formal_Of_Actual, New_Formal);
12700 Next_Formal (Formal_Of_Actual);
12702 Replace_Type (Formal, New_Formal);
12705 Next_Formal (Formal);
12708 -- If this derivation corresponds to a tagged generic actual, then
12709 -- primitive operations rename those of the actual. Otherwise the
12710 -- primitive operations rename those of the parent type, If the parent
12711 -- renames an intrinsic operator, so does the new subprogram. We except
12712 -- concatenation, which is always properly typed, and does not get
12713 -- expanded as other intrinsic operations.
12715 if No (Actual_Subp) then
12716 if Is_Intrinsic_Subprogram (Parent_Subp) then
12717 Set_Is_Intrinsic_Subprogram (New_Subp);
12719 if Present (Alias (Parent_Subp))
12720 and then Chars (Parent_Subp) /= Name_Op_Concat
12722 Set_Alias (New_Subp, Alias (Parent_Subp));
12724 Set_Alias (New_Subp, Parent_Subp);
12728 Set_Alias (New_Subp, Parent_Subp);
12732 Set_Alias (New_Subp, Actual_Subp);
12735 -- Derived subprograms of a tagged type must inherit the convention
12736 -- of the parent subprogram (a requirement of AI-117). Derived
12737 -- subprograms of untagged types simply get convention Ada by default.
12739 if Is_Tagged_Type (Derived_Type) then
12740 Set_Convention (New_Subp, Convention (Parent_Subp));
12743 -- Predefined controlled operations retain their name even if the parent
12744 -- is hidden (see above), but they are not primitive operations if the
12745 -- ancestor is not visible, for example if the parent is a private
12746 -- extension completed with a controlled extension. Note that a full
12747 -- type that is controlled can break privacy: the flag Is_Controlled is
12748 -- set on both views of the type.
12750 if Is_Controlled (Parent_Type)
12752 (Chars (Parent_Subp) = Name_Initialize
12753 or else Chars (Parent_Subp) = Name_Adjust
12754 or else Chars (Parent_Subp) = Name_Finalize)
12755 and then Is_Hidden (Parent_Subp)
12756 and then not Is_Visibly_Controlled (Parent_Type)
12758 Set_Is_Hidden (New_Subp);
12761 Set_Is_Imported (New_Subp, Is_Imported (Parent_Subp));
12762 Set_Is_Exported (New_Subp, Is_Exported (Parent_Subp));
12764 if Ekind (Parent_Subp) = E_Procedure then
12765 Set_Is_Valued_Procedure
12766 (New_Subp, Is_Valued_Procedure (Parent_Subp));
12768 Set_Has_Controlling_Result
12769 (New_Subp, Has_Controlling_Result (Parent_Subp));
12772 -- No_Return must be inherited properly. If this is overridden in the
12773 -- case of a dispatching operation, then a check is made in Sem_Disp
12774 -- that the overriding operation is also No_Return (no such check is
12775 -- required for the case of non-dispatching operation.
12777 Set_No_Return (New_Subp, No_Return (Parent_Subp));
12779 -- A derived function with a controlling result is abstract. If the
12780 -- Derived_Type is a nonabstract formal generic derived type, then
12781 -- inherited operations are not abstract: the required check is done at
12782 -- instantiation time. If the derivation is for a generic actual, the
12783 -- function is not abstract unless the actual is.
12785 if Is_Generic_Type (Derived_Type)
12786 and then not Is_Abstract_Type (Derived_Type)
12790 -- Ada 2005 (AI-228): Calculate the "require overriding" and "abstract"
12791 -- properties of the subprogram, as defined in RM-3.9.3(4/2-6/2).
12793 elsif Ada_Version >= Ada_2005
12794 and then (Is_Abstract_Subprogram (Alias (New_Subp))
12795 or else (Is_Tagged_Type (Derived_Type)
12796 and then Etype (New_Subp) = Derived_Type
12797 and then not Is_Null_Extension (Derived_Type))
12798 or else (Is_Tagged_Type (Derived_Type)
12799 and then Ekind (Etype (New_Subp)) =
12800 E_Anonymous_Access_Type
12801 and then Designated_Type (Etype (New_Subp)) =
12803 and then not Is_Null_Extension (Derived_Type)))
12804 and then No (Actual_Subp)
12806 if not Is_Tagged_Type (Derived_Type)
12807 or else Is_Abstract_Type (Derived_Type)
12808 or else Is_Abstract_Subprogram (Alias (New_Subp))
12810 Set_Is_Abstract_Subprogram (New_Subp);
12812 Set_Requires_Overriding (New_Subp);
12815 elsif Ada_Version < Ada_2005
12816 and then (Is_Abstract_Subprogram (Alias (New_Subp))
12817 or else (Is_Tagged_Type (Derived_Type)
12818 and then Etype (New_Subp) = Derived_Type
12819 and then No (Actual_Subp)))
12821 Set_Is_Abstract_Subprogram (New_Subp);
12823 -- AI05-0097 : an inherited operation that dispatches on result is
12824 -- abstract if the derived type is abstract, even if the parent type
12825 -- is concrete and the derived type is a null extension.
12827 elsif Has_Controlling_Result (Alias (New_Subp))
12828 and then Is_Abstract_Type (Etype (New_Subp))
12830 Set_Is_Abstract_Subprogram (New_Subp);
12832 -- Finally, if the parent type is abstract we must verify that all
12833 -- inherited operations are either non-abstract or overridden, or that
12834 -- the derived type itself is abstract (this check is performed at the
12835 -- end of a package declaration, in Check_Abstract_Overriding). A
12836 -- private overriding in the parent type will not be visible in the
12837 -- derivation if we are not in an inner package or in a child unit of
12838 -- the parent type, in which case the abstractness of the inherited
12839 -- operation is carried to the new subprogram.
12841 elsif Is_Abstract_Type (Parent_Type)
12842 and then not In_Open_Scopes (Scope (Parent_Type))
12843 and then Is_Private_Overriding
12844 and then Is_Abstract_Subprogram (Visible_Subp)
12846 if No (Actual_Subp) then
12847 Set_Alias (New_Subp, Visible_Subp);
12848 Set_Is_Abstract_Subprogram (New_Subp, True);
12851 -- If this is a derivation for an instance of a formal derived
12852 -- type, abstractness comes from the primitive operation of the
12853 -- actual, not from the operation inherited from the ancestor.
12855 Set_Is_Abstract_Subprogram
12856 (New_Subp, Is_Abstract_Subprogram (Actual_Subp));
12860 New_Overloaded_Entity (New_Subp, Derived_Type);
12862 -- Check for case of a derived subprogram for the instantiation of a
12863 -- formal derived tagged type, if so mark the subprogram as dispatching
12864 -- and inherit the dispatching attributes of the parent subprogram. The
12865 -- derived subprogram is effectively renaming of the actual subprogram,
12866 -- so it needs to have the same attributes as the actual.
12868 if Present (Actual_Subp)
12869 and then Is_Dispatching_Operation (Parent_Subp)
12871 Set_Is_Dispatching_Operation (New_Subp);
12873 if Present (DTC_Entity (Parent_Subp)) then
12874 Set_DTC_Entity (New_Subp, DTC_Entity (Parent_Subp));
12875 Set_DT_Position (New_Subp, DT_Position (Parent_Subp));
12879 -- Indicate that a derived subprogram does not require a body and that
12880 -- it does not require processing of default expressions.
12882 Set_Has_Completion (New_Subp);
12883 Set_Default_Expressions_Processed (New_Subp);
12885 if Ekind (New_Subp) = E_Function then
12886 Set_Mechanism (New_Subp, Mechanism (Parent_Subp));
12888 end Derive_Subprogram;
12890 ------------------------
12891 -- Derive_Subprograms --
12892 ------------------------
12894 procedure Derive_Subprograms
12895 (Parent_Type : Entity_Id;
12896 Derived_Type : Entity_Id;
12897 Generic_Actual : Entity_Id := Empty)
12899 Op_List : constant Elist_Id :=
12900 Collect_Primitive_Operations (Parent_Type);
12902 function Check_Derived_Type return Boolean;
12903 -- Check that all primitive inherited from Parent_Type are found in
12904 -- the list of primitives of Derived_Type exactly in the same order.
12906 function Check_Derived_Type return Boolean is
12910 New_Subp : Entity_Id;
12915 -- Traverse list of entities in the current scope searching for
12916 -- an incomplete type whose full-view is derived type
12918 E := First_Entity (Scope (Derived_Type));
12920 and then E /= Derived_Type
12922 if Ekind (E) = E_Incomplete_Type
12923 and then Present (Full_View (E))
12924 and then Full_View (E) = Derived_Type
12926 -- Disable this test if Derived_Type completes an incomplete
12927 -- type because in such case more primitives can be added
12928 -- later to the list of primitives of Derived_Type by routine
12929 -- Process_Incomplete_Dependents
12934 E := Next_Entity (E);
12937 List := Collect_Primitive_Operations (Derived_Type);
12938 Elmt := First_Elmt (List);
12940 Op_Elmt := First_Elmt (Op_List);
12941 while Present (Op_Elmt) loop
12942 Subp := Node (Op_Elmt);
12943 New_Subp := Node (Elmt);
12945 -- At this early stage Derived_Type has no entities with attribute
12946 -- Interface_Alias. In addition, such primitives are always
12947 -- located at the end of the list of primitives of Parent_Type.
12948 -- Therefore, if found we can safely stop processing pending
12951 exit when Present (Interface_Alias (Subp));
12953 -- Handle hidden entities
12955 if not Is_Predefined_Dispatching_Operation (Subp)
12956 and then Is_Hidden (Subp)
12958 if Present (New_Subp)
12959 and then Primitive_Names_Match (Subp, New_Subp)
12965 if not Present (New_Subp)
12966 or else Ekind (Subp) /= Ekind (New_Subp)
12967 or else not Primitive_Names_Match (Subp, New_Subp)
12975 Next_Elmt (Op_Elmt);
12979 end Check_Derived_Type;
12983 Alias_Subp : Entity_Id;
12984 Act_List : Elist_Id;
12985 Act_Elmt : Elmt_Id := No_Elmt;
12986 Act_Subp : Entity_Id := Empty;
12988 Need_Search : Boolean := False;
12989 New_Subp : Entity_Id := Empty;
12990 Parent_Base : Entity_Id;
12993 -- Start of processing for Derive_Subprograms
12996 if Ekind (Parent_Type) = E_Record_Type_With_Private
12997 and then Has_Discriminants (Parent_Type)
12998 and then Present (Full_View (Parent_Type))
13000 Parent_Base := Full_View (Parent_Type);
13002 Parent_Base := Parent_Type;
13005 if Present (Generic_Actual) then
13006 Act_List := Collect_Primitive_Operations (Generic_Actual);
13007 Act_Elmt := First_Elmt (Act_List);
13010 -- Derive primitives inherited from the parent. Note that if the generic
13011 -- actual is present, this is not really a type derivation, it is a
13012 -- completion within an instance.
13014 -- Case 1: Derived_Type does not implement interfaces
13016 if not Is_Tagged_Type (Derived_Type)
13017 or else (not Has_Interfaces (Derived_Type)
13018 and then not (Present (Generic_Actual)
13020 Has_Interfaces (Generic_Actual)))
13022 Elmt := First_Elmt (Op_List);
13023 while Present (Elmt) loop
13024 Subp := Node (Elmt);
13026 -- Literals are derived earlier in the process of building the
13027 -- derived type, and are skipped here.
13029 if Ekind (Subp) = E_Enumeration_Literal then
13032 -- The actual is a direct descendant and the common primitive
13033 -- operations appear in the same order.
13035 -- If the generic parent type is present, the derived type is an
13036 -- instance of a formal derived type, and within the instance its
13037 -- operations are those of the actual. We derive from the formal
13038 -- type but make the inherited operations aliases of the
13039 -- corresponding operations of the actual.
13042 pragma Assert (No (Node (Act_Elmt))
13043 or else (Primitive_Names_Match (Subp, Node (Act_Elmt))
13045 Type_Conformant (Subp, Node (Act_Elmt),
13046 Skip_Controlling_Formals => True)));
13049 (New_Subp, Subp, Derived_Type, Parent_Base, Node (Act_Elmt));
13051 if Present (Act_Elmt) then
13052 Next_Elmt (Act_Elmt);
13059 -- Case 2: Derived_Type implements interfaces
13062 -- If the parent type has no predefined primitives we remove
13063 -- predefined primitives from the list of primitives of generic
13064 -- actual to simplify the complexity of this algorithm.
13066 if Present (Generic_Actual) then
13068 Has_Predefined_Primitives : Boolean := False;
13071 -- Check if the parent type has predefined primitives
13073 Elmt := First_Elmt (Op_List);
13074 while Present (Elmt) loop
13075 Subp := Node (Elmt);
13077 if Is_Predefined_Dispatching_Operation (Subp)
13078 and then not Comes_From_Source (Ultimate_Alias (Subp))
13080 Has_Predefined_Primitives := True;
13087 -- Remove predefined primitives of Generic_Actual. We must use
13088 -- an auxiliary list because in case of tagged types the value
13089 -- returned by Collect_Primitive_Operations is the value stored
13090 -- in its Primitive_Operations attribute (and we don't want to
13091 -- modify its current contents).
13093 if not Has_Predefined_Primitives then
13095 Aux_List : constant Elist_Id := New_Elmt_List;
13098 Elmt := First_Elmt (Act_List);
13099 while Present (Elmt) loop
13100 Subp := Node (Elmt);
13102 if not Is_Predefined_Dispatching_Operation (Subp)
13103 or else Comes_From_Source (Subp)
13105 Append_Elmt (Subp, Aux_List);
13111 Act_List := Aux_List;
13115 Act_Elmt := First_Elmt (Act_List);
13116 Act_Subp := Node (Act_Elmt);
13120 -- Stage 1: If the generic actual is not present we derive the
13121 -- primitives inherited from the parent type. If the generic parent
13122 -- type is present, the derived type is an instance of a formal
13123 -- derived type, and within the instance its operations are those of
13124 -- the actual. We derive from the formal type but make the inherited
13125 -- operations aliases of the corresponding operations of the actual.
13127 Elmt := First_Elmt (Op_List);
13128 while Present (Elmt) loop
13129 Subp := Node (Elmt);
13130 Alias_Subp := Ultimate_Alias (Subp);
13132 -- Do not derive internal entities of the parent that link
13133 -- interface primitives and its covering primitive. These
13134 -- entities will be added to this type when frozen.
13136 if Present (Interface_Alias (Subp)) then
13140 -- If the generic actual is present find the corresponding
13141 -- operation in the generic actual. If the parent type is a
13142 -- direct ancestor of the derived type then, even if it is an
13143 -- interface, the operations are inherited from the primary
13144 -- dispatch table and are in the proper order. If we detect here
13145 -- that primitives are not in the same order we traverse the list
13146 -- of primitive operations of the actual to find the one that
13147 -- implements the interface primitive.
13151 (Present (Generic_Actual)
13152 and then Present (Act_Subp)
13154 (Primitive_Names_Match (Subp, Act_Subp)
13156 Type_Conformant (Subp, Act_Subp,
13157 Skip_Controlling_Formals => True)))
13159 pragma Assert (not Is_Ancestor (Parent_Base, Generic_Actual));
13161 -- Remember that we need searching for all pending primitives
13163 Need_Search := True;
13165 -- Handle entities associated with interface primitives
13167 if Present (Alias_Subp)
13168 and then Is_Interface (Find_Dispatching_Type (Alias_Subp))
13169 and then not Is_Predefined_Dispatching_Operation (Subp)
13171 -- Search for the primitive in the homonym chain
13174 Find_Primitive_Covering_Interface
13175 (Tagged_Type => Generic_Actual,
13176 Iface_Prim => Alias_Subp);
13178 -- Previous search may not locate primitives covering
13179 -- interfaces defined in generics units or instantiations.
13180 -- (it fails if the covering primitive has formals whose
13181 -- type is also defined in generics or instantiations).
13182 -- In such case we search in the list of primitives of the
13183 -- generic actual for the internal entity that links the
13184 -- interface primitive and the covering primitive.
13187 and then Is_Generic_Type (Parent_Type)
13189 -- This code has been designed to handle only generic
13190 -- formals that implement interfaces that are defined
13191 -- in a generic unit or instantiation. If this code is
13192 -- needed for other cases we must review it because
13193 -- (given that it relies on Original_Location to locate
13194 -- the primitive of Generic_Actual that covers the
13195 -- interface) it could leave linked through attribute
13196 -- Alias entities of unrelated instantiations).
13200 (Scope (Find_Dispatching_Type (Alias_Subp)))
13202 Instantiation_Depth
13203 (Sloc (Find_Dispatching_Type (Alias_Subp))) > 0);
13206 Iface_Prim_Loc : constant Source_Ptr :=
13207 Original_Location (Sloc (Alias_Subp));
13212 First_Elmt (Primitive_Operations (Generic_Actual));
13214 Search : while Present (Elmt) loop
13215 Prim := Node (Elmt);
13217 if Present (Interface_Alias (Prim))
13218 and then Original_Location
13219 (Sloc (Interface_Alias (Prim)))
13222 Act_Subp := Alias (Prim);
13231 pragma Assert (Present (Act_Subp)
13232 or else Is_Abstract_Type (Generic_Actual)
13233 or else Serious_Errors_Detected > 0);
13235 -- Handle predefined primitives plus the rest of user-defined
13239 Act_Elmt := First_Elmt (Act_List);
13240 while Present (Act_Elmt) loop
13241 Act_Subp := Node (Act_Elmt);
13243 exit when Primitive_Names_Match (Subp, Act_Subp)
13244 and then Type_Conformant
13246 Skip_Controlling_Formals => True)
13247 and then No (Interface_Alias (Act_Subp));
13249 Next_Elmt (Act_Elmt);
13252 if No (Act_Elmt) then
13258 -- Case 1: If the parent is a limited interface then it has the
13259 -- predefined primitives of synchronized interfaces. However, the
13260 -- actual type may be a non-limited type and hence it does not
13261 -- have such primitives.
13263 if Present (Generic_Actual)
13264 and then not Present (Act_Subp)
13265 and then Is_Limited_Interface (Parent_Base)
13266 and then Is_Predefined_Interface_Primitive (Subp)
13270 -- Case 2: Inherit entities associated with interfaces that were
13271 -- not covered by the parent type. We exclude here null interface
13272 -- primitives because they do not need special management.
13274 -- We also exclude interface operations that are renamings. If the
13275 -- subprogram is an explicit renaming of an interface primitive,
13276 -- it is a regular primitive operation, and the presence of its
13277 -- alias is not relevant: it has to be derived like any other
13280 elsif Present (Alias (Subp))
13281 and then Nkind (Unit_Declaration_Node (Subp)) /=
13282 N_Subprogram_Renaming_Declaration
13283 and then Is_Interface (Find_Dispatching_Type (Alias_Subp))
13285 (Nkind (Parent (Alias_Subp)) = N_Procedure_Specification
13286 and then Null_Present (Parent (Alias_Subp)))
13289 (New_Subp => New_Subp,
13290 Parent_Subp => Alias_Subp,
13291 Derived_Type => Derived_Type,
13292 Parent_Type => Find_Dispatching_Type (Alias_Subp),
13293 Actual_Subp => Act_Subp);
13295 if No (Generic_Actual) then
13296 Set_Alias (New_Subp, Subp);
13299 -- Case 3: Common derivation
13303 (New_Subp => New_Subp,
13304 Parent_Subp => Subp,
13305 Derived_Type => Derived_Type,
13306 Parent_Type => Parent_Base,
13307 Actual_Subp => Act_Subp);
13310 -- No need to update Act_Elm if we must search for the
13311 -- corresponding operation in the generic actual
13314 and then Present (Act_Elmt)
13316 Next_Elmt (Act_Elmt);
13317 Act_Subp := Node (Act_Elmt);
13324 -- Inherit additional operations from progenitors. If the derived
13325 -- type is a generic actual, there are not new primitive operations
13326 -- for the type because it has those of the actual, and therefore
13327 -- nothing needs to be done. The renamings generated above are not
13328 -- primitive operations, and their purpose is simply to make the
13329 -- proper operations visible within an instantiation.
13331 if No (Generic_Actual) then
13332 Derive_Progenitor_Subprograms (Parent_Base, Derived_Type);
13336 -- Final check: Direct descendants must have their primitives in the
13337 -- same order. We exclude from this test untagged types and instances
13338 -- of formal derived types. We skip this test if we have already
13339 -- reported serious errors in the sources.
13341 pragma Assert (not Is_Tagged_Type (Derived_Type)
13342 or else Present (Generic_Actual)
13343 or else Serious_Errors_Detected > 0
13344 or else Check_Derived_Type);
13345 end Derive_Subprograms;
13347 --------------------------------
13348 -- Derived_Standard_Character --
13349 --------------------------------
13351 procedure Derived_Standard_Character
13353 Parent_Type : Entity_Id;
13354 Derived_Type : Entity_Id)
13356 Loc : constant Source_Ptr := Sloc (N);
13357 Def : constant Node_Id := Type_Definition (N);
13358 Indic : constant Node_Id := Subtype_Indication (Def);
13359 Parent_Base : constant Entity_Id := Base_Type (Parent_Type);
13360 Implicit_Base : constant Entity_Id :=
13362 (E_Enumeration_Type, N, Derived_Type, 'B');
13368 Discard_Node (Process_Subtype (Indic, N));
13370 Set_Etype (Implicit_Base, Parent_Base);
13371 Set_Size_Info (Implicit_Base, Root_Type (Parent_Type));
13372 Set_RM_Size (Implicit_Base, RM_Size (Root_Type (Parent_Type)));
13374 Set_Is_Character_Type (Implicit_Base, True);
13375 Set_Has_Delayed_Freeze (Implicit_Base);
13377 -- The bounds of the implicit base are the bounds of the parent base.
13378 -- Note that their type is the parent base.
13380 Lo := New_Copy_Tree (Type_Low_Bound (Parent_Base));
13381 Hi := New_Copy_Tree (Type_High_Bound (Parent_Base));
13383 Set_Scalar_Range (Implicit_Base,
13386 High_Bound => Hi));
13388 Conditional_Delay (Derived_Type, Parent_Type);
13390 Set_Ekind (Derived_Type, E_Enumeration_Subtype);
13391 Set_Etype (Derived_Type, Implicit_Base);
13392 Set_Size_Info (Derived_Type, Parent_Type);
13394 if Unknown_RM_Size (Derived_Type) then
13395 Set_RM_Size (Derived_Type, RM_Size (Parent_Type));
13398 Set_Is_Character_Type (Derived_Type, True);
13400 if Nkind (Indic) /= N_Subtype_Indication then
13402 -- If no explicit constraint, the bounds are those
13403 -- of the parent type.
13405 Lo := New_Copy_Tree (Type_Low_Bound (Parent_Type));
13406 Hi := New_Copy_Tree (Type_High_Bound (Parent_Type));
13407 Set_Scalar_Range (Derived_Type, Make_Range (Loc, Lo, Hi));
13410 Convert_Scalar_Bounds (N, Parent_Type, Derived_Type, Loc);
13412 -- Because the implicit base is used in the conversion of the bounds, we
13413 -- have to freeze it now. This is similar to what is done for numeric
13414 -- types, and it equally suspicious, but otherwise a non-static bound
13415 -- will have a reference to an unfrozen type, which is rejected by Gigi
13416 -- (???). This requires specific care for definition of stream
13417 -- attributes. For details, see comments at the end of
13418 -- Build_Derived_Numeric_Type.
13420 Freeze_Before (N, Implicit_Base);
13421 end Derived_Standard_Character;
13423 ------------------------------
13424 -- Derived_Type_Declaration --
13425 ------------------------------
13427 procedure Derived_Type_Declaration
13430 Is_Completion : Boolean)
13432 Parent_Type : Entity_Id;
13434 function Comes_From_Generic (Typ : Entity_Id) return Boolean;
13435 -- Check whether the parent type is a generic formal, or derives
13436 -- directly or indirectly from one.
13438 ------------------------
13439 -- Comes_From_Generic --
13440 ------------------------
13442 function Comes_From_Generic (Typ : Entity_Id) return Boolean is
13444 if Is_Generic_Type (Typ) then
13447 elsif Is_Generic_Type (Root_Type (Parent_Type)) then
13450 elsif Is_Private_Type (Typ)
13451 and then Present (Full_View (Typ))
13452 and then Is_Generic_Type (Root_Type (Full_View (Typ)))
13456 elsif Is_Generic_Actual_Type (Typ) then
13462 end Comes_From_Generic;
13466 Def : constant Node_Id := Type_Definition (N);
13467 Iface_Def : Node_Id;
13468 Indic : constant Node_Id := Subtype_Indication (Def);
13469 Extension : constant Node_Id := Record_Extension_Part (Def);
13470 Parent_Node : Node_Id;
13471 Parent_Scope : Entity_Id;
13474 -- Start of processing for Derived_Type_Declaration
13477 Parent_Type := Find_Type_Of_Subtype_Indic (Indic);
13479 -- Ada 2005 (AI-251): In case of interface derivation check that the
13480 -- parent is also an interface.
13482 if Interface_Present (Def) then
13483 if not Is_Interface (Parent_Type) then
13484 Diagnose_Interface (Indic, Parent_Type);
13487 Parent_Node := Parent (Base_Type (Parent_Type));
13488 Iface_Def := Type_Definition (Parent_Node);
13490 -- Ada 2005 (AI-251): Limited interfaces can only inherit from
13491 -- other limited interfaces.
13493 if Limited_Present (Def) then
13494 if Limited_Present (Iface_Def) then
13497 elsif Protected_Present (Iface_Def) then
13499 ("descendant of& must be declared"
13500 & " as a protected interface",
13503 elsif Synchronized_Present (Iface_Def) then
13505 ("descendant of& must be declared"
13506 & " as a synchronized interface",
13509 elsif Task_Present (Iface_Def) then
13511 ("descendant of& must be declared as a task interface",
13516 ("(Ada 2005) limited interface cannot "
13517 & "inherit from non-limited interface", Indic);
13520 -- Ada 2005 (AI-345): Non-limited interfaces can only inherit
13521 -- from non-limited or limited interfaces.
13523 elsif not Protected_Present (Def)
13524 and then not Synchronized_Present (Def)
13525 and then not Task_Present (Def)
13527 if Limited_Present (Iface_Def) then
13530 elsif Protected_Present (Iface_Def) then
13532 ("descendant of& must be declared"
13533 & " as a protected interface",
13536 elsif Synchronized_Present (Iface_Def) then
13538 ("descendant of& must be declared"
13539 & " as a synchronized interface",
13542 elsif Task_Present (Iface_Def) then
13544 ("descendant of& must be declared as a task interface",
13553 if Is_Tagged_Type (Parent_Type)
13554 and then Is_Concurrent_Type (Parent_Type)
13555 and then not Is_Interface (Parent_Type)
13558 ("parent type of a record extension cannot be "
13559 & "a synchronized tagged type (RM 3.9.1 (3/1))", N);
13560 Set_Etype (T, Any_Type);
13564 -- Ada 2005 (AI-251): Decorate all the names in the list of ancestor
13567 if Is_Tagged_Type (Parent_Type)
13568 and then Is_Non_Empty_List (Interface_List (Def))
13575 Intf := First (Interface_List (Def));
13576 while Present (Intf) loop
13577 T := Find_Type_Of_Subtype_Indic (Intf);
13579 if not Is_Interface (T) then
13580 Diagnose_Interface (Intf, T);
13582 -- Check the rules of 3.9.4(12/2) and 7.5(2/2) that disallow
13583 -- a limited type from having a nonlimited progenitor.
13585 elsif (Limited_Present (Def)
13586 or else (not Is_Interface (Parent_Type)
13587 and then Is_Limited_Type (Parent_Type)))
13588 and then not Is_Limited_Interface (T)
13591 ("progenitor interface& of limited type must be limited",
13600 if Parent_Type = Any_Type
13601 or else Etype (Parent_Type) = Any_Type
13602 or else (Is_Class_Wide_Type (Parent_Type)
13603 and then Etype (Parent_Type) = T)
13605 -- If Parent_Type is undefined or illegal, make new type into a
13606 -- subtype of Any_Type, and set a few attributes to prevent cascaded
13607 -- errors. If this is a self-definition, emit error now.
13610 or else T = Etype (Parent_Type)
13612 Error_Msg_N ("type cannot be used in its own definition", Indic);
13615 Set_Ekind (T, Ekind (Parent_Type));
13616 Set_Etype (T, Any_Type);
13617 Set_Scalar_Range (T, Scalar_Range (Any_Type));
13619 if Is_Tagged_Type (T)
13620 and then Is_Record_Type (T)
13622 Set_Direct_Primitive_Operations (T, New_Elmt_List);
13628 -- Ada 2005 (AI-251): The case in which the parent of the full-view is
13629 -- an interface is special because the list of interfaces in the full
13630 -- view can be given in any order. For example:
13632 -- type A is interface;
13633 -- type B is interface and A;
13634 -- type D is new B with private;
13636 -- type D is new A and B with null record; -- 1 --
13638 -- In this case we perform the following transformation of -1-:
13640 -- type D is new B and A with null record;
13642 -- If the parent of the full-view covers the parent of the partial-view
13643 -- we have two possible cases:
13645 -- 1) They have the same parent
13646 -- 2) The parent of the full-view implements some further interfaces
13648 -- In both cases we do not need to perform the transformation. In the
13649 -- first case the source program is correct and the transformation is
13650 -- not needed; in the second case the source program does not fulfill
13651 -- the no-hidden interfaces rule (AI-396) and the error will be reported
13654 -- This transformation not only simplifies the rest of the analysis of
13655 -- this type declaration but also simplifies the correct generation of
13656 -- the object layout to the expander.
13658 if In_Private_Part (Current_Scope)
13659 and then Is_Interface (Parent_Type)
13663 Partial_View : Entity_Id;
13664 Partial_View_Parent : Entity_Id;
13665 New_Iface : Node_Id;
13668 -- Look for the associated private type declaration
13670 Partial_View := First_Entity (Current_Scope);
13672 exit when No (Partial_View)
13673 or else (Has_Private_Declaration (Partial_View)
13674 and then Full_View (Partial_View) = T);
13676 Next_Entity (Partial_View);
13679 -- If the partial view was not found then the source code has
13680 -- errors and the transformation is not needed.
13682 if Present (Partial_View) then
13683 Partial_View_Parent := Etype (Partial_View);
13685 -- If the parent of the full-view covers the parent of the
13686 -- partial-view we have nothing else to do.
13688 if Interface_Present_In_Ancestor
13689 (Parent_Type, Partial_View_Parent)
13693 -- Traverse the list of interfaces of the full-view to look
13694 -- for the parent of the partial-view and perform the tree
13698 Iface := First (Interface_List (Def));
13699 while Present (Iface) loop
13700 if Etype (Iface) = Etype (Partial_View) then
13701 Rewrite (Subtype_Indication (Def),
13702 New_Copy (Subtype_Indication
13703 (Parent (Partial_View))));
13705 New_Iface := Make_Identifier (Sloc (N),
13706 Chars (Parent_Type));
13707 Append (New_Iface, Interface_List (Def));
13709 -- Analyze the transformed code
13711 Derived_Type_Declaration (T, N, Is_Completion);
13722 -- Only composite types other than array types are allowed to have
13725 if Present (Discriminant_Specifications (N))
13726 and then (Is_Elementary_Type (Parent_Type)
13727 or else Is_Array_Type (Parent_Type))
13728 and then not Error_Posted (N)
13731 ("elementary or array type cannot have discriminants",
13732 Defining_Identifier (First (Discriminant_Specifications (N))));
13733 Set_Has_Discriminants (T, False);
13736 -- In Ada 83, a derived type defined in a package specification cannot
13737 -- be used for further derivation until the end of its visible part.
13738 -- Note that derivation in the private part of the package is allowed.
13740 if Ada_Version = Ada_83
13741 and then Is_Derived_Type (Parent_Type)
13742 and then In_Visible_Part (Scope (Parent_Type))
13744 if Ada_Version = Ada_83 and then Comes_From_Source (Indic) then
13746 ("(Ada 83): premature use of type for derivation", Indic);
13750 -- Check for early use of incomplete or private type
13752 if Ekind_In (Parent_Type, E_Void, E_Incomplete_Type) then
13753 Error_Msg_N ("premature derivation of incomplete type", Indic);
13756 elsif (Is_Incomplete_Or_Private_Type (Parent_Type)
13757 and then not Comes_From_Generic (Parent_Type))
13758 or else Has_Private_Component (Parent_Type)
13760 -- The ancestor type of a formal type can be incomplete, in which
13761 -- case only the operations of the partial view are available in
13762 -- the generic. Subsequent checks may be required when the full
13763 -- view is analyzed, to verify that derivation from a tagged type
13764 -- has an extension.
13766 if Nkind (Original_Node (N)) = N_Formal_Type_Declaration then
13769 elsif No (Underlying_Type (Parent_Type))
13770 or else Has_Private_Component (Parent_Type)
13773 ("premature derivation of derived or private type", Indic);
13775 -- Flag the type itself as being in error, this prevents some
13776 -- nasty problems with subsequent uses of the malformed type.
13778 Set_Error_Posted (T);
13780 -- Check that within the immediate scope of an untagged partial
13781 -- view it's illegal to derive from the partial view if the
13782 -- full view is tagged. (7.3(7))
13784 -- We verify that the Parent_Type is a partial view by checking
13785 -- that it is not a Full_Type_Declaration (i.e. a private type or
13786 -- private extension declaration), to distinguish a partial view
13787 -- from a derivation from a private type which also appears as
13790 elsif Present (Full_View (Parent_Type))
13791 and then Nkind (Parent (Parent_Type)) /= N_Full_Type_Declaration
13792 and then not Is_Tagged_Type (Parent_Type)
13793 and then Is_Tagged_Type (Full_View (Parent_Type))
13795 Parent_Scope := Scope (T);
13796 while Present (Parent_Scope)
13797 and then Parent_Scope /= Standard_Standard
13799 if Parent_Scope = Scope (Parent_Type) then
13801 ("premature derivation from type with tagged full view",
13805 Parent_Scope := Scope (Parent_Scope);
13810 -- Check that form of derivation is appropriate
13812 Taggd := Is_Tagged_Type (Parent_Type);
13814 -- Perhaps the parent type should be changed to the class-wide type's
13815 -- specific type in this case to prevent cascading errors ???
13817 if Present (Extension) and then Is_Class_Wide_Type (Parent_Type) then
13818 Error_Msg_N ("parent type must not be a class-wide type", Indic);
13822 if Present (Extension) and then not Taggd then
13824 ("type derived from untagged type cannot have extension", Indic);
13826 elsif No (Extension) and then Taggd then
13828 -- If this declaration is within a private part (or body) of a
13829 -- generic instantiation then the derivation is allowed (the parent
13830 -- type can only appear tagged in this case if it's a generic actual
13831 -- type, since it would otherwise have been rejected in the analysis
13832 -- of the generic template).
13834 if not Is_Generic_Actual_Type (Parent_Type)
13835 or else In_Visible_Part (Scope (Parent_Type))
13837 if Is_Class_Wide_Type (Parent_Type) then
13839 ("parent type must not be a class-wide type", Indic);
13841 -- Use specific type to prevent cascaded errors.
13843 Parent_Type := Etype (Parent_Type);
13847 ("type derived from tagged type must have extension", Indic);
13852 -- AI-443: Synchronized formal derived types require a private
13853 -- extension. There is no point in checking the ancestor type or
13854 -- the progenitors since the construct is wrong to begin with.
13856 if Ada_Version >= Ada_2005
13857 and then Is_Generic_Type (T)
13858 and then Present (Original_Node (N))
13861 Decl : constant Node_Id := Original_Node (N);
13864 if Nkind (Decl) = N_Formal_Type_Declaration
13865 and then Nkind (Formal_Type_Definition (Decl)) =
13866 N_Formal_Derived_Type_Definition
13867 and then Synchronized_Present (Formal_Type_Definition (Decl))
13868 and then No (Extension)
13870 -- Avoid emitting a duplicate error message
13872 and then not Error_Posted (Indic)
13875 ("synchronized derived type must have extension", N);
13880 if Null_Exclusion_Present (Def)
13881 and then not Is_Access_Type (Parent_Type)
13883 Error_Msg_N ("null exclusion can only apply to an access type", N);
13886 -- Avoid deriving parent primitives of underlying record views
13888 Build_Derived_Type (N, Parent_Type, T, Is_Completion,
13889 Derive_Subps => not Is_Underlying_Record_View (T));
13891 -- AI-419: The parent type of an explicitly limited derived type must
13892 -- be a limited type or a limited interface.
13894 if Limited_Present (Def) then
13895 Set_Is_Limited_Record (T);
13897 if Is_Interface (T) then
13898 Set_Is_Limited_Interface (T);
13901 if not Is_Limited_Type (Parent_Type)
13903 (not Is_Interface (Parent_Type)
13904 or else not Is_Limited_Interface (Parent_Type))
13906 -- AI05-0096: a derivation in the private part of an instance is
13907 -- legal if the generic formal is untagged limited, and the actual
13910 if Is_Generic_Actual_Type (Parent_Type)
13911 and then In_Private_Part (Current_Scope)
13914 (Generic_Parent_Type (Parent (Parent_Type)))
13920 ("parent type& of limited type must be limited",
13925 end Derived_Type_Declaration;
13927 ------------------------
13928 -- Diagnose_Interface --
13929 ------------------------
13931 procedure Diagnose_Interface (N : Node_Id; E : Entity_Id) is
13933 if not Is_Interface (E)
13934 and then E /= Any_Type
13936 Error_Msg_NE ("(Ada 2005) & must be an interface", N, E);
13938 end Diagnose_Interface;
13940 ----------------------------------
13941 -- Enumeration_Type_Declaration --
13942 ----------------------------------
13944 procedure Enumeration_Type_Declaration (T : Entity_Id; Def : Node_Id) is
13951 -- Create identifier node representing lower bound
13953 B_Node := New_Node (N_Identifier, Sloc (Def));
13954 L := First (Literals (Def));
13955 Set_Chars (B_Node, Chars (L));
13956 Set_Entity (B_Node, L);
13957 Set_Etype (B_Node, T);
13958 Set_Is_Static_Expression (B_Node, True);
13960 R_Node := New_Node (N_Range, Sloc (Def));
13961 Set_Low_Bound (R_Node, B_Node);
13963 Set_Ekind (T, E_Enumeration_Type);
13964 Set_First_Literal (T, L);
13966 Set_Is_Constrained (T);
13970 -- Loop through literals of enumeration type setting pos and rep values
13971 -- except that if the Ekind is already set, then it means the literal
13972 -- was already constructed (case of a derived type declaration and we
13973 -- should not disturb the Pos and Rep values.
13975 while Present (L) loop
13976 if Ekind (L) /= E_Enumeration_Literal then
13977 Set_Ekind (L, E_Enumeration_Literal);
13978 Set_Enumeration_Pos (L, Ev);
13979 Set_Enumeration_Rep (L, Ev);
13980 Set_Is_Known_Valid (L, True);
13984 New_Overloaded_Entity (L);
13985 Generate_Definition (L);
13986 Set_Convention (L, Convention_Intrinsic);
13988 -- Case of character literal
13990 if Nkind (L) = N_Defining_Character_Literal then
13991 Set_Is_Character_Type (T, True);
13993 -- Check violation of No_Wide_Characters
13995 if Restriction_Check_Required (No_Wide_Characters) then
13996 Get_Name_String (Chars (L));
13998 if Name_Len >= 3 and then Name_Buffer (1 .. 2) = "QW" then
13999 Check_Restriction (No_Wide_Characters, L);
14008 -- Now create a node representing upper bound
14010 B_Node := New_Node (N_Identifier, Sloc (Def));
14011 Set_Chars (B_Node, Chars (Last (Literals (Def))));
14012 Set_Entity (B_Node, Last (Literals (Def)));
14013 Set_Etype (B_Node, T);
14014 Set_Is_Static_Expression (B_Node, True);
14016 Set_High_Bound (R_Node, B_Node);
14018 -- Initialize various fields of the type. Some of this information
14019 -- may be overwritten later through rep.clauses.
14021 Set_Scalar_Range (T, R_Node);
14022 Set_RM_Size (T, UI_From_Int (Minimum_Size (T)));
14023 Set_Enum_Esize (T);
14024 Set_Enum_Pos_To_Rep (T, Empty);
14026 -- Set Discard_Names if configuration pragma set, or if there is
14027 -- a parameterless pragma in the current declarative region
14029 if Global_Discard_Names
14030 or else Discard_Names (Scope (T))
14032 Set_Discard_Names (T);
14035 -- Process end label if there is one
14037 if Present (Def) then
14038 Process_End_Label (Def, 'e', T);
14040 end Enumeration_Type_Declaration;
14042 ---------------------------------
14043 -- Expand_To_Stored_Constraint --
14044 ---------------------------------
14046 function Expand_To_Stored_Constraint
14048 Constraint : Elist_Id) return Elist_Id
14050 Explicitly_Discriminated_Type : Entity_Id;
14051 Expansion : Elist_Id;
14052 Discriminant : Entity_Id;
14054 function Type_With_Explicit_Discrims (Id : Entity_Id) return Entity_Id;
14055 -- Find the nearest type that actually specifies discriminants
14057 ---------------------------------
14058 -- Type_With_Explicit_Discrims --
14059 ---------------------------------
14061 function Type_With_Explicit_Discrims (Id : Entity_Id) return Entity_Id is
14062 Typ : constant E := Base_Type (Id);
14065 if Ekind (Typ) in Incomplete_Or_Private_Kind then
14066 if Present (Full_View (Typ)) then
14067 return Type_With_Explicit_Discrims (Full_View (Typ));
14071 if Has_Discriminants (Typ) then
14076 if Etype (Typ) = Typ then
14078 elsif Has_Discriminants (Typ) then
14081 return Type_With_Explicit_Discrims (Etype (Typ));
14084 end Type_With_Explicit_Discrims;
14086 -- Start of processing for Expand_To_Stored_Constraint
14090 or else Is_Empty_Elmt_List (Constraint)
14095 Explicitly_Discriminated_Type := Type_With_Explicit_Discrims (Typ);
14097 if No (Explicitly_Discriminated_Type) then
14101 Expansion := New_Elmt_List;
14104 First_Stored_Discriminant (Explicitly_Discriminated_Type);
14105 while Present (Discriminant) loop
14107 Get_Discriminant_Value (
14108 Discriminant, Explicitly_Discriminated_Type, Constraint),
14110 Next_Stored_Discriminant (Discriminant);
14114 end Expand_To_Stored_Constraint;
14116 ---------------------------
14117 -- Find_Hidden_Interface --
14118 ---------------------------
14120 function Find_Hidden_Interface
14122 Dest : Elist_Id) return Entity_Id
14125 Iface_Elmt : Elmt_Id;
14128 if Present (Src) and then Present (Dest) then
14129 Iface_Elmt := First_Elmt (Src);
14130 while Present (Iface_Elmt) loop
14131 Iface := Node (Iface_Elmt);
14133 if Is_Interface (Iface)
14134 and then not Contain_Interface (Iface, Dest)
14139 Next_Elmt (Iface_Elmt);
14144 end Find_Hidden_Interface;
14146 --------------------
14147 -- Find_Type_Name --
14148 --------------------
14150 function Find_Type_Name (N : Node_Id) return Entity_Id is
14151 Id : constant Entity_Id := Defining_Identifier (N);
14153 New_Id : Entity_Id;
14154 Prev_Par : Node_Id;
14156 procedure Tag_Mismatch;
14157 -- Diagnose a tagged partial view whose full view is untagged.
14158 -- We post the message on the full view, with a reference to
14159 -- the previous partial view. The partial view can be private
14160 -- or incomplete, and these are handled in a different manner,
14161 -- so we determine the position of the error message from the
14162 -- respective slocs of both.
14168 procedure Tag_Mismatch is
14170 if Sloc (Prev) < Sloc (Id) then
14171 if Ada_Version >= Ada_2012
14172 and then Nkind (N) = N_Private_Type_Declaration
14175 ("declaration of private } must be a tagged type ", Id, Prev);
14178 ("full declaration of } must be a tagged type ", Id, Prev);
14181 if Ada_Version >= Ada_2012
14182 and then Nkind (N) = N_Private_Type_Declaration
14185 ("declaration of private } must be a tagged type ", Prev, Id);
14188 ("full declaration of } must be a tagged type ", Prev, Id);
14193 -- Start of processing for Find_Type_Name
14196 -- Find incomplete declaration, if one was given
14198 Prev := Current_Entity_In_Scope (Id);
14200 -- New type declaration
14206 -- Previous declaration exists
14209 Prev_Par := Parent (Prev);
14211 -- Error if not incomplete/private case except if previous
14212 -- declaration is implicit, etc. Enter_Name will emit error if
14215 if not Is_Incomplete_Or_Private_Type (Prev) then
14219 -- Check invalid completion of private or incomplete type
14221 elsif not Nkind_In (N, N_Full_Type_Declaration,
14222 N_Task_Type_Declaration,
14223 N_Protected_Type_Declaration)
14225 (Ada_Version < Ada_2012
14226 or else not Is_Incomplete_Type (Prev)
14227 or else not Nkind_In (N, N_Private_Type_Declaration,
14228 N_Private_Extension_Declaration))
14230 -- Completion must be a full type declarations (RM 7.3(4))
14232 Error_Msg_Sloc := Sloc (Prev);
14233 Error_Msg_NE ("invalid completion of }", Id, Prev);
14235 -- Set scope of Id to avoid cascaded errors. Entity is never
14236 -- examined again, except when saving globals in generics.
14238 Set_Scope (Id, Current_Scope);
14241 -- If this is a repeated incomplete declaration, no further
14242 -- checks are possible.
14244 if Nkind (N) = N_Incomplete_Type_Declaration then
14248 -- Case of full declaration of incomplete type
14250 elsif Ekind (Prev) = E_Incomplete_Type
14251 and then (Ada_Version < Ada_2012
14252 or else No (Full_View (Prev))
14253 or else not Is_Private_Type (Full_View (Prev)))
14256 -- Indicate that the incomplete declaration has a matching full
14257 -- declaration. The defining occurrence of the incomplete
14258 -- declaration remains the visible one, and the procedure
14259 -- Get_Full_View dereferences it whenever the type is used.
14261 if Present (Full_View (Prev)) then
14262 Error_Msg_NE ("invalid redeclaration of }", Id, Prev);
14265 Set_Full_View (Prev, Id);
14266 Append_Entity (Id, Current_Scope);
14267 Set_Is_Public (Id, Is_Public (Prev));
14268 Set_Is_Internal (Id);
14271 -- If the incomplete view is tagged, a class_wide type has been
14272 -- created already. Use it for the private type as well, in order
14273 -- to prevent multiple incompatible class-wide types that may be
14274 -- created for self-referential anonymous access components.
14276 if Is_Tagged_Type (Prev)
14277 and then Present (Class_Wide_Type (Prev))
14279 Set_Ekind (Id, Ekind (Prev)); -- will be reset later
14280 Set_Class_Wide_Type (Id, Class_Wide_Type (Prev));
14281 Set_Etype (Class_Wide_Type (Id), Id);
14284 -- Case of full declaration of private type
14287 -- If the private type was a completion of an incomplete type then
14288 -- update Prev to reference the private type
14290 if Ada_Version >= Ada_2012
14291 and then Ekind (Prev) = E_Incomplete_Type
14292 and then Present (Full_View (Prev))
14293 and then Is_Private_Type (Full_View (Prev))
14295 Prev := Full_View (Prev);
14296 Prev_Par := Parent (Prev);
14299 if Nkind (Parent (Prev)) /= N_Private_Extension_Declaration then
14300 if Etype (Prev) /= Prev then
14302 -- Prev is a private subtype or a derived type, and needs
14305 Error_Msg_NE ("invalid redeclaration of }", Id, Prev);
14308 elsif Ekind (Prev) = E_Private_Type
14309 and then Nkind_In (N, N_Task_Type_Declaration,
14310 N_Protected_Type_Declaration)
14313 ("completion of nonlimited type cannot be limited", N);
14315 elsif Ekind (Prev) = E_Record_Type_With_Private
14316 and then Nkind_In (N, N_Task_Type_Declaration,
14317 N_Protected_Type_Declaration)
14319 if not Is_Limited_Record (Prev) then
14321 ("completion of nonlimited type cannot be limited", N);
14323 elsif No (Interface_List (N)) then
14325 ("completion of tagged private type must be tagged",
14329 elsif Nkind (N) = N_Full_Type_Declaration
14331 Nkind (Type_Definition (N)) = N_Record_Definition
14332 and then Interface_Present (Type_Definition (N))
14335 ("completion of private type cannot be an interface", N);
14338 -- Ada 2005 (AI-251): Private extension declaration of a task
14339 -- type or a protected type. This case arises when covering
14340 -- interface types.
14342 elsif Nkind_In (N, N_Task_Type_Declaration,
14343 N_Protected_Type_Declaration)
14347 elsif Nkind (N) /= N_Full_Type_Declaration
14348 or else Nkind (Type_Definition (N)) /= N_Derived_Type_Definition
14351 ("full view of private extension must be an extension", N);
14353 elsif not (Abstract_Present (Parent (Prev)))
14354 and then Abstract_Present (Type_Definition (N))
14357 ("full view of non-abstract extension cannot be abstract", N);
14360 if not In_Private_Part (Current_Scope) then
14362 ("declaration of full view must appear in private part", N);
14365 Copy_And_Swap (Prev, Id);
14366 Set_Has_Private_Declaration (Prev);
14367 Set_Has_Private_Declaration (Id);
14369 -- If no error, propagate freeze_node from private to full view.
14370 -- It may have been generated for an early operational item.
14372 if Present (Freeze_Node (Id))
14373 and then Serious_Errors_Detected = 0
14374 and then No (Full_View (Id))
14376 Set_Freeze_Node (Prev, Freeze_Node (Id));
14377 Set_Freeze_Node (Id, Empty);
14378 Set_First_Rep_Item (Prev, First_Rep_Item (Id));
14381 Set_Full_View (Id, Prev);
14385 -- Verify that full declaration conforms to partial one
14387 if Is_Incomplete_Or_Private_Type (Prev)
14388 and then Present (Discriminant_Specifications (Prev_Par))
14390 if Present (Discriminant_Specifications (N)) then
14391 if Ekind (Prev) = E_Incomplete_Type then
14392 Check_Discriminant_Conformance (N, Prev, Prev);
14394 Check_Discriminant_Conformance (N, Prev, Id);
14399 ("missing discriminants in full type declaration", N);
14401 -- To avoid cascaded errors on subsequent use, share the
14402 -- discriminants of the partial view.
14404 Set_Discriminant_Specifications (N,
14405 Discriminant_Specifications (Prev_Par));
14409 -- A prior untagged partial view can have an associated class-wide
14410 -- type due to use of the class attribute, and in this case the full
14411 -- type must also be tagged. This Ada 95 usage is deprecated in favor
14412 -- of incomplete tagged declarations, but we check for it.
14415 and then (Is_Tagged_Type (Prev)
14416 or else Present (Class_Wide_Type (Prev)))
14418 -- Ada 2012 (AI05-0162): A private type may be the completion of
14419 -- an incomplete type
14421 if Ada_Version >= Ada_2012
14422 and then Is_Incomplete_Type (Prev)
14423 and then Nkind_In (N, N_Private_Type_Declaration,
14424 N_Private_Extension_Declaration)
14426 -- No need to check private extensions since they are tagged
14428 if Nkind (N) = N_Private_Type_Declaration
14429 and then not Tagged_Present (N)
14434 -- The full declaration is either a tagged type (including
14435 -- a synchronized type that implements interfaces) or a
14436 -- type extension, otherwise this is an error.
14438 elsif Nkind_In (N, N_Task_Type_Declaration,
14439 N_Protected_Type_Declaration)
14441 if No (Interface_List (N))
14442 and then not Error_Posted (N)
14447 elsif Nkind (Type_Definition (N)) = N_Record_Definition then
14449 -- Indicate that the previous declaration (tagged incomplete
14450 -- or private declaration) requires the same on the full one.
14452 if not Tagged_Present (Type_Definition (N)) then
14454 Set_Is_Tagged_Type (Id);
14457 elsif Nkind (Type_Definition (N)) = N_Derived_Type_Definition then
14458 if No (Record_Extension_Part (Type_Definition (N))) then
14460 ("full declaration of } must be a record extension",
14463 -- Set some attributes to produce a usable full view
14465 Set_Is_Tagged_Type (Id);
14475 end Find_Type_Name;
14477 -------------------------
14478 -- Find_Type_Of_Object --
14479 -------------------------
14481 function Find_Type_Of_Object
14482 (Obj_Def : Node_Id;
14483 Related_Nod : Node_Id) return Entity_Id
14485 Def_Kind : constant Node_Kind := Nkind (Obj_Def);
14486 P : Node_Id := Parent (Obj_Def);
14491 -- If the parent is a component_definition node we climb to the
14492 -- component_declaration node
14494 if Nkind (P) = N_Component_Definition then
14498 -- Case of an anonymous array subtype
14500 if Nkind_In (Def_Kind, N_Constrained_Array_Definition,
14501 N_Unconstrained_Array_Definition)
14504 Array_Type_Declaration (T, Obj_Def);
14506 -- Create an explicit subtype whenever possible
14508 elsif Nkind (P) /= N_Component_Declaration
14509 and then Def_Kind = N_Subtype_Indication
14511 -- Base name of subtype on object name, which will be unique in
14512 -- the current scope.
14514 -- If this is a duplicate declaration, return base type, to avoid
14515 -- generating duplicate anonymous types.
14517 if Error_Posted (P) then
14518 Analyze (Subtype_Mark (Obj_Def));
14519 return Entity (Subtype_Mark (Obj_Def));
14524 (Chars (Defining_Identifier (Related_Nod)), 'S', 0, 'T');
14526 T := Make_Defining_Identifier (Sloc (P), Nam);
14528 Insert_Action (Obj_Def,
14529 Make_Subtype_Declaration (Sloc (P),
14530 Defining_Identifier => T,
14531 Subtype_Indication => Relocate_Node (Obj_Def)));
14533 -- This subtype may need freezing, and this will not be done
14534 -- automatically if the object declaration is not in declarative
14535 -- part. Since this is an object declaration, the type cannot always
14536 -- be frozen here. Deferred constants do not freeze their type
14537 -- (which often enough will be private).
14539 if Nkind (P) = N_Object_Declaration
14540 and then Constant_Present (P)
14541 and then No (Expression (P))
14545 Insert_Actions (Obj_Def, Freeze_Entity (T, P));
14548 -- Ada 2005 AI-406: the object definition in an object declaration
14549 -- can be an access definition.
14551 elsif Def_Kind = N_Access_Definition then
14552 T := Access_Definition (Related_Nod, Obj_Def);
14553 Set_Is_Local_Anonymous_Access (T);
14555 -- Otherwise, the object definition is just a subtype_mark
14558 T := Process_Subtype (Obj_Def, Related_Nod);
14562 end Find_Type_Of_Object;
14564 --------------------------------
14565 -- Find_Type_Of_Subtype_Indic --
14566 --------------------------------
14568 function Find_Type_Of_Subtype_Indic (S : Node_Id) return Entity_Id is
14572 -- Case of subtype mark with a constraint
14574 if Nkind (S) = N_Subtype_Indication then
14575 Find_Type (Subtype_Mark (S));
14576 Typ := Entity (Subtype_Mark (S));
14579 Is_Valid_Constraint_Kind (Ekind (Typ), Nkind (Constraint (S)))
14582 ("incorrect constraint for this kind of type", Constraint (S));
14583 Rewrite (S, New_Copy_Tree (Subtype_Mark (S)));
14586 -- Otherwise we have a subtype mark without a constraint
14588 elsif Error_Posted (S) then
14589 Rewrite (S, New_Occurrence_Of (Any_Id, Sloc (S)));
14597 -- Check No_Wide_Characters restriction
14599 Check_Wide_Character_Restriction (Typ, S);
14602 end Find_Type_Of_Subtype_Indic;
14604 -------------------------------------
14605 -- Floating_Point_Type_Declaration --
14606 -------------------------------------
14608 procedure Floating_Point_Type_Declaration (T : Entity_Id; Def : Node_Id) is
14609 Digs : constant Node_Id := Digits_Expression (Def);
14611 Base_Typ : Entity_Id;
14612 Implicit_Base : Entity_Id;
14615 function Can_Derive_From (E : Entity_Id) return Boolean;
14616 -- Find if given digits value allows derivation from specified type
14618 ---------------------
14619 -- Can_Derive_From --
14620 ---------------------
14622 function Can_Derive_From (E : Entity_Id) return Boolean is
14623 Spec : constant Entity_Id := Real_Range_Specification (Def);
14626 if Digs_Val > Digits_Value (E) then
14630 if Present (Spec) then
14631 if Expr_Value_R (Type_Low_Bound (E)) >
14632 Expr_Value_R (Low_Bound (Spec))
14637 if Expr_Value_R (Type_High_Bound (E)) <
14638 Expr_Value_R (High_Bound (Spec))
14645 end Can_Derive_From;
14647 -- Start of processing for Floating_Point_Type_Declaration
14650 Check_Restriction (No_Floating_Point, Def);
14652 -- Create an implicit base type
14655 Create_Itype (E_Floating_Point_Type, Parent (Def), T, 'B');
14657 -- Analyze and verify digits value
14659 Analyze_And_Resolve (Digs, Any_Integer);
14660 Check_Digits_Expression (Digs);
14661 Digs_Val := Expr_Value (Digs);
14663 -- Process possible range spec and find correct type to derive from
14665 Process_Real_Range_Specification (Def);
14667 if Can_Derive_From (Standard_Short_Float) then
14668 Base_Typ := Standard_Short_Float;
14669 elsif Can_Derive_From (Standard_Float) then
14670 Base_Typ := Standard_Float;
14671 elsif Can_Derive_From (Standard_Long_Float) then
14672 Base_Typ := Standard_Long_Float;
14673 elsif Can_Derive_From (Standard_Long_Long_Float) then
14674 Base_Typ := Standard_Long_Long_Float;
14676 -- If we can't derive from any existing type, use long_long_float
14677 -- and give appropriate message explaining the problem.
14680 Base_Typ := Standard_Long_Long_Float;
14682 if Digs_Val >= Digits_Value (Standard_Long_Long_Float) then
14683 Error_Msg_Uint_1 := Digits_Value (Standard_Long_Long_Float);
14684 Error_Msg_N ("digits value out of range, maximum is ^", Digs);
14688 ("range too large for any predefined type",
14689 Real_Range_Specification (Def));
14693 -- If there are bounds given in the declaration use them as the bounds
14694 -- of the type, otherwise use the bounds of the predefined base type
14695 -- that was chosen based on the Digits value.
14697 if Present (Real_Range_Specification (Def)) then
14698 Set_Scalar_Range (T, Real_Range_Specification (Def));
14699 Set_Is_Constrained (T);
14701 -- The bounds of this range must be converted to machine numbers
14702 -- in accordance with RM 4.9(38).
14704 Bound := Type_Low_Bound (T);
14706 if Nkind (Bound) = N_Real_Literal then
14708 (Bound, Machine (Base_Typ, Realval (Bound), Round, Bound));
14709 Set_Is_Machine_Number (Bound);
14712 Bound := Type_High_Bound (T);
14714 if Nkind (Bound) = N_Real_Literal then
14716 (Bound, Machine (Base_Typ, Realval (Bound), Round, Bound));
14717 Set_Is_Machine_Number (Bound);
14721 Set_Scalar_Range (T, Scalar_Range (Base_Typ));
14724 -- Complete definition of implicit base and declared first subtype
14726 Set_Etype (Implicit_Base, Base_Typ);
14728 Set_Scalar_Range (Implicit_Base, Scalar_Range (Base_Typ));
14729 Set_Size_Info (Implicit_Base, (Base_Typ));
14730 Set_RM_Size (Implicit_Base, RM_Size (Base_Typ));
14731 Set_First_Rep_Item (Implicit_Base, First_Rep_Item (Base_Typ));
14732 Set_Digits_Value (Implicit_Base, Digits_Value (Base_Typ));
14733 Set_Float_Rep (Implicit_Base, Float_Rep (Base_Typ));
14735 Set_Ekind (T, E_Floating_Point_Subtype);
14736 Set_Etype (T, Implicit_Base);
14738 Set_Size_Info (T, (Implicit_Base));
14739 Set_RM_Size (T, RM_Size (Implicit_Base));
14740 Set_First_Rep_Item (T, First_Rep_Item (Implicit_Base));
14741 Set_Digits_Value (T, Digs_Val);
14742 end Floating_Point_Type_Declaration;
14744 ----------------------------
14745 -- Get_Discriminant_Value --
14746 ----------------------------
14748 -- This is the situation:
14750 -- There is a non-derived type
14752 -- type T0 (Dx, Dy, Dz...)
14754 -- There are zero or more levels of derivation, with each derivation
14755 -- either purely inheriting the discriminants, or defining its own.
14757 -- type Ti is new Ti-1
14759 -- type Ti (Dw) is new Ti-1(Dw, 1, X+Y)
14761 -- subtype Ti is ...
14763 -- The subtype issue is avoided by the use of Original_Record_Component,
14764 -- and the fact that derived subtypes also derive the constraints.
14766 -- This chain leads back from
14768 -- Typ_For_Constraint
14770 -- Typ_For_Constraint has discriminants, and the value for each
14771 -- discriminant is given by its corresponding Elmt of Constraints.
14773 -- Discriminant is some discriminant in this hierarchy
14775 -- We need to return its value
14777 -- We do this by recursively searching each level, and looking for
14778 -- Discriminant. Once we get to the bottom, we start backing up
14779 -- returning the value for it which may in turn be a discriminant
14780 -- further up, so on the backup we continue the substitution.
14782 function Get_Discriminant_Value
14783 (Discriminant : Entity_Id;
14784 Typ_For_Constraint : Entity_Id;
14785 Constraint : Elist_Id) return Node_Id
14787 function Search_Derivation_Levels
14789 Discrim_Values : Elist_Id;
14790 Stored_Discrim_Values : Boolean) return Node_Or_Entity_Id;
14791 -- This is the routine that performs the recursive search of levels
14792 -- as described above.
14794 ------------------------------
14795 -- Search_Derivation_Levels --
14796 ------------------------------
14798 function Search_Derivation_Levels
14800 Discrim_Values : Elist_Id;
14801 Stored_Discrim_Values : Boolean) return Node_Or_Entity_Id
14805 Result : Node_Or_Entity_Id;
14806 Result_Entity : Node_Id;
14809 -- If inappropriate type, return Error, this happens only in
14810 -- cascaded error situations, and we want to avoid a blow up.
14812 if not Is_Composite_Type (Ti) or else Is_Array_Type (Ti) then
14816 -- Look deeper if possible. Use Stored_Constraints only for
14817 -- untagged types. For tagged types use the given constraint.
14818 -- This asymmetry needs explanation???
14820 if not Stored_Discrim_Values
14821 and then Present (Stored_Constraint (Ti))
14822 and then not Is_Tagged_Type (Ti)
14825 Search_Derivation_Levels (Ti, Stored_Constraint (Ti), True);
14828 Td : constant Entity_Id := Etype (Ti);
14832 Result := Discriminant;
14835 if Present (Stored_Constraint (Ti)) then
14837 Search_Derivation_Levels
14838 (Td, Stored_Constraint (Ti), True);
14841 Search_Derivation_Levels
14842 (Td, Discrim_Values, Stored_Discrim_Values);
14848 -- Extra underlying places to search, if not found above. For
14849 -- concurrent types, the relevant discriminant appears in the
14850 -- corresponding record. For a type derived from a private type
14851 -- without discriminant, the full view inherits the discriminants
14852 -- of the full view of the parent.
14854 if Result = Discriminant then
14855 if Is_Concurrent_Type (Ti)
14856 and then Present (Corresponding_Record_Type (Ti))
14859 Search_Derivation_Levels (
14860 Corresponding_Record_Type (Ti),
14862 Stored_Discrim_Values);
14864 elsif Is_Private_Type (Ti)
14865 and then not Has_Discriminants (Ti)
14866 and then Present (Full_View (Ti))
14867 and then Etype (Full_View (Ti)) /= Ti
14870 Search_Derivation_Levels (
14873 Stored_Discrim_Values);
14877 -- If Result is not a (reference to a) discriminant, return it,
14878 -- otherwise set Result_Entity to the discriminant.
14880 if Nkind (Result) = N_Defining_Identifier then
14881 pragma Assert (Result = Discriminant);
14882 Result_Entity := Result;
14885 if not Denotes_Discriminant (Result) then
14889 Result_Entity := Entity (Result);
14892 -- See if this level of derivation actually has discriminants
14893 -- because tagged derivations can add them, hence the lower
14894 -- levels need not have any.
14896 if not Has_Discriminants (Ti) then
14900 -- Scan Ti's discriminants for Result_Entity,
14901 -- and return its corresponding value, if any.
14903 Result_Entity := Original_Record_Component (Result_Entity);
14905 Assoc := First_Elmt (Discrim_Values);
14907 if Stored_Discrim_Values then
14908 Disc := First_Stored_Discriminant (Ti);
14910 Disc := First_Discriminant (Ti);
14913 while Present (Disc) loop
14914 pragma Assert (Present (Assoc));
14916 if Original_Record_Component (Disc) = Result_Entity then
14917 return Node (Assoc);
14922 if Stored_Discrim_Values then
14923 Next_Stored_Discriminant (Disc);
14925 Next_Discriminant (Disc);
14929 -- Could not find it
14932 end Search_Derivation_Levels;
14936 Result : Node_Or_Entity_Id;
14938 -- Start of processing for Get_Discriminant_Value
14941 -- ??? This routine is a gigantic mess and will be deleted. For the
14942 -- time being just test for the trivial case before calling recurse.
14944 if Base_Type (Scope (Discriminant)) = Base_Type (Typ_For_Constraint) then
14950 D := First_Discriminant (Typ_For_Constraint);
14951 E := First_Elmt (Constraint);
14952 while Present (D) loop
14953 if Chars (D) = Chars (Discriminant) then
14957 Next_Discriminant (D);
14963 Result := Search_Derivation_Levels
14964 (Typ_For_Constraint, Constraint, False);
14966 -- ??? hack to disappear when this routine is gone
14968 if Nkind (Result) = N_Defining_Identifier then
14974 D := First_Discriminant (Typ_For_Constraint);
14975 E := First_Elmt (Constraint);
14976 while Present (D) loop
14977 if Corresponding_Discriminant (D) = Discriminant then
14981 Next_Discriminant (D);
14987 pragma Assert (Nkind (Result) /= N_Defining_Identifier);
14989 end Get_Discriminant_Value;
14991 --------------------------
14992 -- Has_Range_Constraint --
14993 --------------------------
14995 function Has_Range_Constraint (N : Node_Id) return Boolean is
14996 C : constant Node_Id := Constraint (N);
14999 if Nkind (C) = N_Range_Constraint then
15002 elsif Nkind (C) = N_Digits_Constraint then
15004 Is_Decimal_Fixed_Point_Type (Entity (Subtype_Mark (N)))
15006 Present (Range_Constraint (C));
15008 elsif Nkind (C) = N_Delta_Constraint then
15009 return Present (Range_Constraint (C));
15014 end Has_Range_Constraint;
15016 ------------------------
15017 -- Inherit_Components --
15018 ------------------------
15020 function Inherit_Components
15022 Parent_Base : Entity_Id;
15023 Derived_Base : Entity_Id;
15024 Is_Tagged : Boolean;
15025 Inherit_Discr : Boolean;
15026 Discs : Elist_Id) return Elist_Id
15028 Assoc_List : constant Elist_Id := New_Elmt_List;
15030 procedure Inherit_Component
15031 (Old_C : Entity_Id;
15032 Plain_Discrim : Boolean := False;
15033 Stored_Discrim : Boolean := False);
15034 -- Inherits component Old_C from Parent_Base to the Derived_Base. If
15035 -- Plain_Discrim is True, Old_C is a discriminant. If Stored_Discrim is
15036 -- True, Old_C is a stored discriminant. If they are both false then
15037 -- Old_C is a regular component.
15039 -----------------------
15040 -- Inherit_Component --
15041 -----------------------
15043 procedure Inherit_Component
15044 (Old_C : Entity_Id;
15045 Plain_Discrim : Boolean := False;
15046 Stored_Discrim : Boolean := False)
15048 New_C : constant Entity_Id := New_Copy (Old_C);
15050 Discrim : Entity_Id;
15051 Corr_Discrim : Entity_Id;
15054 pragma Assert (not Is_Tagged or else not Stored_Discrim);
15056 Set_Parent (New_C, Parent (Old_C));
15058 -- Regular discriminants and components must be inserted in the scope
15059 -- of the Derived_Base. Do it here.
15061 if not Stored_Discrim then
15062 Enter_Name (New_C);
15065 -- For tagged types the Original_Record_Component must point to
15066 -- whatever this field was pointing to in the parent type. This has
15067 -- already been achieved by the call to New_Copy above.
15069 if not Is_Tagged then
15070 Set_Original_Record_Component (New_C, New_C);
15073 -- If we have inherited a component then see if its Etype contains
15074 -- references to Parent_Base discriminants. In this case, replace
15075 -- these references with the constraints given in Discs. We do not
15076 -- do this for the partial view of private types because this is
15077 -- not needed (only the components of the full view will be used
15078 -- for code generation) and cause problem. We also avoid this
15079 -- transformation in some error situations.
15081 if Ekind (New_C) = E_Component then
15082 if (Is_Private_Type (Derived_Base)
15083 and then not Is_Generic_Type (Derived_Base))
15084 or else (Is_Empty_Elmt_List (Discs)
15085 and then not Expander_Active)
15087 Set_Etype (New_C, Etype (Old_C));
15090 -- The current component introduces a circularity of the
15093 -- limited with Pack_2;
15094 -- package Pack_1 is
15095 -- type T_1 is tagged record
15096 -- Comp : access Pack_2.T_2;
15102 -- package Pack_2 is
15103 -- type T_2 is new Pack_1.T_1 with ...;
15108 Constrain_Component_Type
15109 (Old_C, Derived_Base, N, Parent_Base, Discs));
15113 -- In derived tagged types it is illegal to reference a non
15114 -- discriminant component in the parent type. To catch this, mark
15115 -- these components with an Ekind of E_Void. This will be reset in
15116 -- Record_Type_Definition after processing the record extension of
15117 -- the derived type.
15119 -- If the declaration is a private extension, there is no further
15120 -- record extension to process, and the components retain their
15121 -- current kind, because they are visible at this point.
15123 if Is_Tagged and then Ekind (New_C) = E_Component
15124 and then Nkind (N) /= N_Private_Extension_Declaration
15126 Set_Ekind (New_C, E_Void);
15129 if Plain_Discrim then
15130 Set_Corresponding_Discriminant (New_C, Old_C);
15131 Build_Discriminal (New_C);
15133 -- If we are explicitly inheriting a stored discriminant it will be
15134 -- completely hidden.
15136 elsif Stored_Discrim then
15137 Set_Corresponding_Discriminant (New_C, Empty);
15138 Set_Discriminal (New_C, Empty);
15139 Set_Is_Completely_Hidden (New_C);
15141 -- Set the Original_Record_Component of each discriminant in the
15142 -- derived base to point to the corresponding stored that we just
15145 Discrim := First_Discriminant (Derived_Base);
15146 while Present (Discrim) loop
15147 Corr_Discrim := Corresponding_Discriminant (Discrim);
15149 -- Corr_Discrim could be missing in an error situation
15151 if Present (Corr_Discrim)
15152 and then Original_Record_Component (Corr_Discrim) = Old_C
15154 Set_Original_Record_Component (Discrim, New_C);
15157 Next_Discriminant (Discrim);
15160 Append_Entity (New_C, Derived_Base);
15163 if not Is_Tagged then
15164 Append_Elmt (Old_C, Assoc_List);
15165 Append_Elmt (New_C, Assoc_List);
15167 end Inherit_Component;
15169 -- Variables local to Inherit_Component
15171 Loc : constant Source_Ptr := Sloc (N);
15173 Parent_Discrim : Entity_Id;
15174 Stored_Discrim : Entity_Id;
15176 Component : Entity_Id;
15178 -- Start of processing for Inherit_Components
15181 if not Is_Tagged then
15182 Append_Elmt (Parent_Base, Assoc_List);
15183 Append_Elmt (Derived_Base, Assoc_List);
15186 -- Inherit parent discriminants if needed
15188 if Inherit_Discr then
15189 Parent_Discrim := First_Discriminant (Parent_Base);
15190 while Present (Parent_Discrim) loop
15191 Inherit_Component (Parent_Discrim, Plain_Discrim => True);
15192 Next_Discriminant (Parent_Discrim);
15196 -- Create explicit stored discrims for untagged types when necessary
15198 if not Has_Unknown_Discriminants (Derived_Base)
15199 and then Has_Discriminants (Parent_Base)
15200 and then not Is_Tagged
15203 or else First_Discriminant (Parent_Base) /=
15204 First_Stored_Discriminant (Parent_Base))
15206 Stored_Discrim := First_Stored_Discriminant (Parent_Base);
15207 while Present (Stored_Discrim) loop
15208 Inherit_Component (Stored_Discrim, Stored_Discrim => True);
15209 Next_Stored_Discriminant (Stored_Discrim);
15213 -- See if we can apply the second transformation for derived types, as
15214 -- explained in point 6. in the comments above Build_Derived_Record_Type
15215 -- This is achieved by appending Derived_Base discriminants into Discs,
15216 -- which has the side effect of returning a non empty Discs list to the
15217 -- caller of Inherit_Components, which is what we want. This must be
15218 -- done for private derived types if there are explicit stored
15219 -- discriminants, to ensure that we can retrieve the values of the
15220 -- constraints provided in the ancestors.
15223 and then Is_Empty_Elmt_List (Discs)
15224 and then Present (First_Discriminant (Derived_Base))
15226 (not Is_Private_Type (Derived_Base)
15227 or else Is_Completely_Hidden
15228 (First_Stored_Discriminant (Derived_Base))
15229 or else Is_Generic_Type (Derived_Base))
15231 D := First_Discriminant (Derived_Base);
15232 while Present (D) loop
15233 Append_Elmt (New_Reference_To (D, Loc), Discs);
15234 Next_Discriminant (D);
15238 -- Finally, inherit non-discriminant components unless they are not
15239 -- visible because defined or inherited from the full view of the
15240 -- parent. Don't inherit the _parent field of the parent type.
15242 Component := First_Entity (Parent_Base);
15243 while Present (Component) loop
15245 -- Ada 2005 (AI-251): Do not inherit components associated with
15246 -- secondary tags of the parent.
15248 if Ekind (Component) = E_Component
15249 and then Present (Related_Type (Component))
15253 elsif Ekind (Component) /= E_Component
15254 or else Chars (Component) = Name_uParent
15258 -- If the derived type is within the parent type's declarative
15259 -- region, then the components can still be inherited even though
15260 -- they aren't visible at this point. This can occur for cases
15261 -- such as within public child units where the components must
15262 -- become visible upon entering the child unit's private part.
15264 elsif not Is_Visible_Component (Component)
15265 and then not In_Open_Scopes (Scope (Parent_Base))
15269 elsif Ekind_In (Derived_Base, E_Private_Type,
15270 E_Limited_Private_Type)
15275 Inherit_Component (Component);
15278 Next_Entity (Component);
15281 -- For tagged derived types, inherited discriminants cannot be used in
15282 -- component declarations of the record extension part. To achieve this
15283 -- we mark the inherited discriminants as not visible.
15285 if Is_Tagged and then Inherit_Discr then
15286 D := First_Discriminant (Derived_Base);
15287 while Present (D) loop
15288 Set_Is_Immediately_Visible (D, False);
15289 Next_Discriminant (D);
15294 end Inherit_Components;
15296 -----------------------
15297 -- Is_Null_Extension --
15298 -----------------------
15300 function Is_Null_Extension (T : Entity_Id) return Boolean is
15301 Type_Decl : constant Node_Id := Parent (Base_Type (T));
15302 Comp_List : Node_Id;
15306 if Nkind (Type_Decl) /= N_Full_Type_Declaration
15307 or else not Is_Tagged_Type (T)
15308 or else Nkind (Type_Definition (Type_Decl)) /=
15309 N_Derived_Type_Definition
15310 or else No (Record_Extension_Part (Type_Definition (Type_Decl)))
15316 Component_List (Record_Extension_Part (Type_Definition (Type_Decl)));
15318 if Present (Discriminant_Specifications (Type_Decl)) then
15321 elsif Present (Comp_List)
15322 and then Is_Non_Empty_List (Component_Items (Comp_List))
15324 Comp := First (Component_Items (Comp_List));
15326 -- Only user-defined components are relevant. The component list
15327 -- may also contain a parent component and internal components
15328 -- corresponding to secondary tags, but these do not determine
15329 -- whether this is a null extension.
15331 while Present (Comp) loop
15332 if Comes_From_Source (Comp) then
15343 end Is_Null_Extension;
15345 ------------------------------
15346 -- Is_Valid_Constraint_Kind --
15347 ------------------------------
15349 function Is_Valid_Constraint_Kind
15350 (T_Kind : Type_Kind;
15351 Constraint_Kind : Node_Kind) return Boolean
15355 when Enumeration_Kind |
15357 return Constraint_Kind = N_Range_Constraint;
15359 when Decimal_Fixed_Point_Kind =>
15360 return Nkind_In (Constraint_Kind, N_Digits_Constraint,
15361 N_Range_Constraint);
15363 when Ordinary_Fixed_Point_Kind =>
15364 return Nkind_In (Constraint_Kind, N_Delta_Constraint,
15365 N_Range_Constraint);
15368 return Nkind_In (Constraint_Kind, N_Digits_Constraint,
15369 N_Range_Constraint);
15376 E_Incomplete_Type |
15379 return Constraint_Kind = N_Index_Or_Discriminant_Constraint;
15382 return True; -- Error will be detected later
15384 end Is_Valid_Constraint_Kind;
15386 --------------------------
15387 -- Is_Visible_Component --
15388 --------------------------
15390 function Is_Visible_Component (C : Entity_Id) return Boolean is
15391 Original_Comp : Entity_Id := Empty;
15392 Original_Scope : Entity_Id;
15393 Type_Scope : Entity_Id;
15395 function Is_Local_Type (Typ : Entity_Id) return Boolean;
15396 -- Check whether parent type of inherited component is declared locally,
15397 -- possibly within a nested package or instance. The current scope is
15398 -- the derived record itself.
15400 -------------------
15401 -- Is_Local_Type --
15402 -------------------
15404 function Is_Local_Type (Typ : Entity_Id) return Boolean is
15408 Scop := Scope (Typ);
15409 while Present (Scop)
15410 and then Scop /= Standard_Standard
15412 if Scop = Scope (Current_Scope) then
15416 Scop := Scope (Scop);
15422 -- Start of processing for Is_Visible_Component
15425 if Ekind_In (C, E_Component, E_Discriminant) then
15426 Original_Comp := Original_Record_Component (C);
15429 if No (Original_Comp) then
15431 -- Premature usage, or previous error
15436 Original_Scope := Scope (Original_Comp);
15437 Type_Scope := Scope (Base_Type (Scope (C)));
15440 -- This test only concerns tagged types
15442 if not Is_Tagged_Type (Original_Scope) then
15445 -- If it is _Parent or _Tag, there is no visibility issue
15447 elsif not Comes_From_Source (Original_Comp) then
15450 -- If we are in the body of an instantiation, the component is visible
15451 -- even when the parent type (possibly defined in an enclosing unit or
15452 -- in a parent unit) might not.
15454 elsif In_Instance_Body then
15457 -- Discriminants are always visible
15459 elsif Ekind (Original_Comp) = E_Discriminant
15460 and then not Has_Unknown_Discriminants (Original_Scope)
15464 -- If the component has been declared in an ancestor which is currently
15465 -- a private type, then it is not visible. The same applies if the
15466 -- component's containing type is not in an open scope and the original
15467 -- component's enclosing type is a visible full view of a private type
15468 -- (which can occur in cases where an attempt is being made to reference
15469 -- a component in a sibling package that is inherited from a visible
15470 -- component of a type in an ancestor package; the component in the
15471 -- sibling package should not be visible even though the component it
15472 -- inherited from is visible). This does not apply however in the case
15473 -- where the scope of the type is a private child unit, or when the
15474 -- parent comes from a local package in which the ancestor is currently
15475 -- visible. The latter suppression of visibility is needed for cases
15476 -- that are tested in B730006.
15478 elsif Is_Private_Type (Original_Scope)
15480 (not Is_Private_Descendant (Type_Scope)
15481 and then not In_Open_Scopes (Type_Scope)
15482 and then Has_Private_Declaration (Original_Scope))
15484 -- If the type derives from an entity in a formal package, there
15485 -- are no additional visible components.
15487 if Nkind (Original_Node (Unit_Declaration_Node (Type_Scope))) =
15488 N_Formal_Package_Declaration
15492 -- if we are not in the private part of the current package, there
15493 -- are no additional visible components.
15495 elsif Ekind (Scope (Current_Scope)) = E_Package
15496 and then not In_Private_Part (Scope (Current_Scope))
15501 Is_Child_Unit (Cunit_Entity (Current_Sem_Unit))
15502 and then In_Open_Scopes (Scope (Original_Scope))
15503 and then Is_Local_Type (Type_Scope);
15506 -- There is another weird way in which a component may be invisible
15507 -- when the private and the full view are not derived from the same
15508 -- ancestor. Here is an example :
15510 -- type A1 is tagged record F1 : integer; end record;
15511 -- type A2 is new A1 with record F2 : integer; end record;
15512 -- type T is new A1 with private;
15514 -- type T is new A2 with null record;
15516 -- In this case, the full view of T inherits F1 and F2 but the private
15517 -- view inherits only F1
15521 Ancestor : Entity_Id := Scope (C);
15525 if Ancestor = Original_Scope then
15527 elsif Ancestor = Etype (Ancestor) then
15531 Ancestor := Etype (Ancestor);
15535 end Is_Visible_Component;
15537 --------------------------
15538 -- Make_Class_Wide_Type --
15539 --------------------------
15541 procedure Make_Class_Wide_Type (T : Entity_Id) is
15542 CW_Type : Entity_Id;
15544 Next_E : Entity_Id;
15547 -- The class wide type can have been defined by the partial view, in
15548 -- which case everything is already done.
15550 if Present (Class_Wide_Type (T)) then
15555 New_External_Entity (E_Void, Scope (T), Sloc (T), T, 'C', 0, 'T');
15557 -- Inherit root type characteristics
15559 CW_Name := Chars (CW_Type);
15560 Next_E := Next_Entity (CW_Type);
15561 Copy_Node (T, CW_Type);
15562 Set_Comes_From_Source (CW_Type, False);
15563 Set_Chars (CW_Type, CW_Name);
15564 Set_Parent (CW_Type, Parent (T));
15565 Set_Next_Entity (CW_Type, Next_E);
15567 -- Ensure we have a new freeze node for the class-wide type. The partial
15568 -- view may have freeze action of its own, requiring a proper freeze
15569 -- node, and the same freeze node cannot be shared between the two
15572 Set_Has_Delayed_Freeze (CW_Type);
15573 Set_Freeze_Node (CW_Type, Empty);
15575 -- Customize the class-wide type: It has no prim. op., it cannot be
15576 -- abstract and its Etype points back to the specific root type.
15578 Set_Ekind (CW_Type, E_Class_Wide_Type);
15579 Set_Is_Tagged_Type (CW_Type, True);
15580 Set_Direct_Primitive_Operations (CW_Type, New_Elmt_List);
15581 Set_Is_Abstract_Type (CW_Type, False);
15582 Set_Is_Constrained (CW_Type, False);
15583 Set_Is_First_Subtype (CW_Type, Is_First_Subtype (T));
15585 if Ekind (T) = E_Class_Wide_Subtype then
15586 Set_Etype (CW_Type, Etype (Base_Type (T)));
15588 Set_Etype (CW_Type, T);
15591 -- If this is the class_wide type of a constrained subtype, it does
15592 -- not have discriminants.
15594 Set_Has_Discriminants (CW_Type,
15595 Has_Discriminants (T) and then not Is_Constrained (T));
15597 Set_Has_Unknown_Discriminants (CW_Type, True);
15598 Set_Class_Wide_Type (T, CW_Type);
15599 Set_Equivalent_Type (CW_Type, Empty);
15601 -- The class-wide type of a class-wide type is itself (RM 3.9(14))
15603 Set_Class_Wide_Type (CW_Type, CW_Type);
15604 end Make_Class_Wide_Type;
15610 procedure Make_Index
15612 Related_Nod : Node_Id;
15613 Related_Id : Entity_Id := Empty;
15614 Suffix_Index : Nat := 1)
15618 Def_Id : Entity_Id := Empty;
15619 Found : Boolean := False;
15622 -- For a discrete range used in a constrained array definition and
15623 -- defined by a range, an implicit conversion to the predefined type
15624 -- INTEGER is assumed if each bound is either a numeric literal, a named
15625 -- number, or an attribute, and the type of both bounds (prior to the
15626 -- implicit conversion) is the type universal_integer. Otherwise, both
15627 -- bounds must be of the same discrete type, other than universal
15628 -- integer; this type must be determinable independently of the
15629 -- context, but using the fact that the type must be discrete and that
15630 -- both bounds must have the same type.
15632 -- Character literals also have a universal type in the absence of
15633 -- of additional context, and are resolved to Standard_Character.
15635 if Nkind (I) = N_Range then
15637 -- The index is given by a range constraint. The bounds are known
15638 -- to be of a consistent type.
15640 if not Is_Overloaded (I) then
15643 -- For universal bounds, choose the specific predefined type
15645 if T = Universal_Integer then
15646 T := Standard_Integer;
15648 elsif T = Any_Character then
15649 Ambiguous_Character (Low_Bound (I));
15651 T := Standard_Character;
15654 -- The node may be overloaded because some user-defined operators
15655 -- are available, but if a universal interpretation exists it is
15656 -- also the selected one.
15658 elsif Universal_Interpretation (I) = Universal_Integer then
15659 T := Standard_Integer;
15665 Ind : Interp_Index;
15669 Get_First_Interp (I, Ind, It);
15670 while Present (It.Typ) loop
15671 if Is_Discrete_Type (It.Typ) then
15674 and then not Covers (It.Typ, T)
15675 and then not Covers (T, It.Typ)
15677 Error_Msg_N ("ambiguous bounds in discrete range", I);
15685 Get_Next_Interp (Ind, It);
15688 if T = Any_Type then
15689 Error_Msg_N ("discrete type required for range", I);
15690 Set_Etype (I, Any_Type);
15693 elsif T = Universal_Integer then
15694 T := Standard_Integer;
15699 if not Is_Discrete_Type (T) then
15700 Error_Msg_N ("discrete type required for range", I);
15701 Set_Etype (I, Any_Type);
15705 if Nkind (Low_Bound (I)) = N_Attribute_Reference
15706 and then Attribute_Name (Low_Bound (I)) = Name_First
15707 and then Is_Entity_Name (Prefix (Low_Bound (I)))
15708 and then Is_Type (Entity (Prefix (Low_Bound (I))))
15709 and then Is_Discrete_Type (Entity (Prefix (Low_Bound (I))))
15711 -- The type of the index will be the type of the prefix, as long
15712 -- as the upper bound is 'Last of the same type.
15714 Def_Id := Entity (Prefix (Low_Bound (I)));
15716 if Nkind (High_Bound (I)) /= N_Attribute_Reference
15717 or else Attribute_Name (High_Bound (I)) /= Name_Last
15718 or else not Is_Entity_Name (Prefix (High_Bound (I)))
15719 or else Entity (Prefix (High_Bound (I))) /= Def_Id
15726 Process_Range_Expr_In_Decl (R, T);
15728 elsif Nkind (I) = N_Subtype_Indication then
15730 -- The index is given by a subtype with a range constraint
15732 T := Base_Type (Entity (Subtype_Mark (I)));
15734 if not Is_Discrete_Type (T) then
15735 Error_Msg_N ("discrete type required for range", I);
15736 Set_Etype (I, Any_Type);
15740 R := Range_Expression (Constraint (I));
15743 Process_Range_Expr_In_Decl (R, Entity (Subtype_Mark (I)));
15745 elsif Nkind (I) = N_Attribute_Reference then
15747 -- The parser guarantees that the attribute is a RANGE attribute
15749 -- If the node denotes the range of a type mark, that is also the
15750 -- resulting type, and we do no need to create an Itype for it.
15752 if Is_Entity_Name (Prefix (I))
15753 and then Comes_From_Source (I)
15754 and then Is_Type (Entity (Prefix (I)))
15755 and then Is_Discrete_Type (Entity (Prefix (I)))
15757 Def_Id := Entity (Prefix (I));
15760 Analyze_And_Resolve (I);
15764 -- If none of the above, must be a subtype. We convert this to a
15765 -- range attribute reference because in the case of declared first
15766 -- named subtypes, the types in the range reference can be different
15767 -- from the type of the entity. A range attribute normalizes the
15768 -- reference and obtains the correct types for the bounds.
15770 -- This transformation is in the nature of an expansion, is only
15771 -- done if expansion is active. In particular, it is not done on
15772 -- formal generic types, because we need to retain the name of the
15773 -- original index for instantiation purposes.
15776 if not Is_Entity_Name (I) or else not Is_Type (Entity (I)) then
15777 Error_Msg_N ("invalid subtype mark in discrete range ", I);
15778 Set_Etype (I, Any_Integer);
15782 -- The type mark may be that of an incomplete type. It is only
15783 -- now that we can get the full view, previous analysis does
15784 -- not look specifically for a type mark.
15786 Set_Entity (I, Get_Full_View (Entity (I)));
15787 Set_Etype (I, Entity (I));
15788 Def_Id := Entity (I);
15790 if not Is_Discrete_Type (Def_Id) then
15791 Error_Msg_N ("discrete type required for index", I);
15792 Set_Etype (I, Any_Type);
15797 if Expander_Active then
15799 Make_Attribute_Reference (Sloc (I),
15800 Attribute_Name => Name_Range,
15801 Prefix => Relocate_Node (I)));
15803 -- The original was a subtype mark that does not freeze. This
15804 -- means that the rewritten version must not freeze either.
15806 Set_Must_Not_Freeze (I);
15807 Set_Must_Not_Freeze (Prefix (I));
15809 -- Is order critical??? if so, document why, if not
15810 -- use Analyze_And_Resolve
15812 Analyze_And_Resolve (I);
15816 -- If expander is inactive, type is legal, nothing else to construct
15823 if not Is_Discrete_Type (T) then
15824 Error_Msg_N ("discrete type required for range", I);
15825 Set_Etype (I, Any_Type);
15828 elsif T = Any_Type then
15829 Set_Etype (I, Any_Type);
15833 -- We will now create the appropriate Itype to describe the range, but
15834 -- first a check. If we originally had a subtype, then we just label
15835 -- the range with this subtype. Not only is there no need to construct
15836 -- a new subtype, but it is wrong to do so for two reasons:
15838 -- 1. A legality concern, if we have a subtype, it must not freeze,
15839 -- and the Itype would cause freezing incorrectly
15841 -- 2. An efficiency concern, if we created an Itype, it would not be
15842 -- recognized as the same type for the purposes of eliminating
15843 -- checks in some circumstances.
15845 -- We signal this case by setting the subtype entity in Def_Id
15847 if No (Def_Id) then
15849 Create_Itype (E_Void, Related_Nod, Related_Id, 'D', Suffix_Index);
15850 Set_Etype (Def_Id, Base_Type (T));
15852 if Is_Signed_Integer_Type (T) then
15853 Set_Ekind (Def_Id, E_Signed_Integer_Subtype);
15855 elsif Is_Modular_Integer_Type (T) then
15856 Set_Ekind (Def_Id, E_Modular_Integer_Subtype);
15859 Set_Ekind (Def_Id, E_Enumeration_Subtype);
15860 Set_Is_Character_Type (Def_Id, Is_Character_Type (T));
15861 Set_First_Literal (Def_Id, First_Literal (T));
15864 Set_Size_Info (Def_Id, (T));
15865 Set_RM_Size (Def_Id, RM_Size (T));
15866 Set_First_Rep_Item (Def_Id, First_Rep_Item (T));
15868 Set_Scalar_Range (Def_Id, R);
15869 Conditional_Delay (Def_Id, T);
15871 -- In the subtype indication case, if the immediate parent of the
15872 -- new subtype is non-static, then the subtype we create is non-
15873 -- static, even if its bounds are static.
15875 if Nkind (I) = N_Subtype_Indication
15876 and then not Is_Static_Subtype (Entity (Subtype_Mark (I)))
15878 Set_Is_Non_Static_Subtype (Def_Id);
15882 -- Final step is to label the index with this constructed type
15884 Set_Etype (I, Def_Id);
15887 ------------------------------
15888 -- Modular_Type_Declaration --
15889 ------------------------------
15891 procedure Modular_Type_Declaration (T : Entity_Id; Def : Node_Id) is
15892 Mod_Expr : constant Node_Id := Expression (Def);
15895 procedure Set_Modular_Size (Bits : Int);
15896 -- Sets RM_Size to Bits, and Esize to normal word size above this
15898 ----------------------
15899 -- Set_Modular_Size --
15900 ----------------------
15902 procedure Set_Modular_Size (Bits : Int) is
15904 Set_RM_Size (T, UI_From_Int (Bits));
15909 elsif Bits <= 16 then
15910 Init_Esize (T, 16);
15912 elsif Bits <= 32 then
15913 Init_Esize (T, 32);
15916 Init_Esize (T, System_Max_Binary_Modulus_Power);
15919 if not Non_Binary_Modulus (T)
15920 and then Esize (T) = RM_Size (T)
15922 Set_Is_Known_Valid (T);
15924 end Set_Modular_Size;
15926 -- Start of processing for Modular_Type_Declaration
15929 Analyze_And_Resolve (Mod_Expr, Any_Integer);
15931 Set_Ekind (T, E_Modular_Integer_Type);
15932 Init_Alignment (T);
15933 Set_Is_Constrained (T);
15935 if not Is_OK_Static_Expression (Mod_Expr) then
15936 Flag_Non_Static_Expr
15937 ("non-static expression used for modular type bound!", Mod_Expr);
15938 M_Val := 2 ** System_Max_Binary_Modulus_Power;
15940 M_Val := Expr_Value (Mod_Expr);
15944 Error_Msg_N ("modulus value must be positive", Mod_Expr);
15945 M_Val := 2 ** System_Max_Binary_Modulus_Power;
15948 Set_Modulus (T, M_Val);
15950 -- Create bounds for the modular type based on the modulus given in
15951 -- the type declaration and then analyze and resolve those bounds.
15953 Set_Scalar_Range (T,
15954 Make_Range (Sloc (Mod_Expr),
15956 Make_Integer_Literal (Sloc (Mod_Expr), 0),
15958 Make_Integer_Literal (Sloc (Mod_Expr), M_Val - 1)));
15960 -- Properly analyze the literals for the range. We do this manually
15961 -- because we can't go calling Resolve, since we are resolving these
15962 -- bounds with the type, and this type is certainly not complete yet!
15964 Set_Etype (Low_Bound (Scalar_Range (T)), T);
15965 Set_Etype (High_Bound (Scalar_Range (T)), T);
15966 Set_Is_Static_Expression (Low_Bound (Scalar_Range (T)));
15967 Set_Is_Static_Expression (High_Bound (Scalar_Range (T)));
15969 -- Loop through powers of two to find number of bits required
15971 for Bits in Int range 0 .. System_Max_Binary_Modulus_Power loop
15975 if M_Val = 2 ** Bits then
15976 Set_Modular_Size (Bits);
15981 elsif M_Val < 2 ** Bits then
15982 Set_Non_Binary_Modulus (T);
15984 if Bits > System_Max_Nonbinary_Modulus_Power then
15985 Error_Msg_Uint_1 :=
15986 UI_From_Int (System_Max_Nonbinary_Modulus_Power);
15988 ("nonbinary modulus exceeds limit (2 '*'*^ - 1)", Mod_Expr);
15989 Set_Modular_Size (System_Max_Binary_Modulus_Power);
15993 -- In the non-binary case, set size as per RM 13.3(55)
15995 Set_Modular_Size (Bits);
16002 -- If we fall through, then the size exceed System.Max_Binary_Modulus
16003 -- so we just signal an error and set the maximum size.
16005 Error_Msg_Uint_1 := UI_From_Int (System_Max_Binary_Modulus_Power);
16006 Error_Msg_F ("modulus exceeds limit (2 '*'*^)", Mod_Expr);
16008 Set_Modular_Size (System_Max_Binary_Modulus_Power);
16009 Init_Alignment (T);
16011 end Modular_Type_Declaration;
16013 --------------------------
16014 -- New_Concatenation_Op --
16015 --------------------------
16017 procedure New_Concatenation_Op (Typ : Entity_Id) is
16018 Loc : constant Source_Ptr := Sloc (Typ);
16021 function Make_Op_Formal (Typ, Op : Entity_Id) return Entity_Id;
16022 -- Create abbreviated declaration for the formal of a predefined
16023 -- Operator 'Op' of type 'Typ'
16025 --------------------
16026 -- Make_Op_Formal --
16027 --------------------
16029 function Make_Op_Formal (Typ, Op : Entity_Id) return Entity_Id is
16030 Formal : Entity_Id;
16032 Formal := New_Internal_Entity (E_In_Parameter, Op, Loc, 'P');
16033 Set_Etype (Formal, Typ);
16034 Set_Mechanism (Formal, Default_Mechanism);
16036 end Make_Op_Formal;
16038 -- Start of processing for New_Concatenation_Op
16041 Op := Make_Defining_Operator_Symbol (Loc, Name_Op_Concat);
16043 Set_Ekind (Op, E_Operator);
16044 Set_Scope (Op, Current_Scope);
16045 Set_Etype (Op, Typ);
16046 Set_Homonym (Op, Get_Name_Entity_Id (Name_Op_Concat));
16047 Set_Is_Immediately_Visible (Op);
16048 Set_Is_Intrinsic_Subprogram (Op);
16049 Set_Has_Completion (Op);
16050 Append_Entity (Op, Current_Scope);
16052 Set_Name_Entity_Id (Name_Op_Concat, Op);
16054 Append_Entity (Make_Op_Formal (Typ, Op), Op);
16055 Append_Entity (Make_Op_Formal (Typ, Op), Op);
16056 end New_Concatenation_Op;
16058 -------------------------
16059 -- OK_For_Limited_Init --
16060 -------------------------
16062 -- ???Check all calls of this, and compare the conditions under which it's
16065 function OK_For_Limited_Init
16067 Exp : Node_Id) return Boolean
16070 return Is_CPP_Constructor_Call (Exp)
16071 or else (Ada_Version >= Ada_2005
16072 and then not Debug_Flag_Dot_L
16073 and then OK_For_Limited_Init_In_05 (Typ, Exp));
16074 end OK_For_Limited_Init;
16076 -------------------------------
16077 -- OK_For_Limited_Init_In_05 --
16078 -------------------------------
16080 function OK_For_Limited_Init_In_05
16082 Exp : Node_Id) return Boolean
16085 -- An object of a limited interface type can be initialized with any
16086 -- expression of a nonlimited descendant type.
16088 if Is_Class_Wide_Type (Typ)
16089 and then Is_Limited_Interface (Typ)
16090 and then not Is_Limited_Type (Etype (Exp))
16095 -- Ada 2005 (AI-287, AI-318): Relax the strictness of the front end in
16096 -- case of limited aggregates (including extension aggregates), and
16097 -- function calls. The function call may have been given in prefixed
16098 -- notation, in which case the original node is an indexed component.
16099 -- If the function is parameterless, the original node was an explicit
16102 case Nkind (Original_Node (Exp)) is
16103 when N_Aggregate | N_Extension_Aggregate | N_Function_Call | N_Op =>
16106 when N_Qualified_Expression =>
16108 OK_For_Limited_Init_In_05
16109 (Typ, Expression (Original_Node (Exp)));
16111 -- Ada 2005 (AI-251): If a class-wide interface object is initialized
16112 -- with a function call, the expander has rewritten the call into an
16113 -- N_Type_Conversion node to force displacement of the pointer to
16114 -- reference the component containing the secondary dispatch table.
16115 -- Otherwise a type conversion is not a legal context.
16116 -- A return statement for a build-in-place function returning a
16117 -- synchronized type also introduces an unchecked conversion.
16119 when N_Type_Conversion |
16120 N_Unchecked_Type_Conversion =>
16121 return not Comes_From_Source (Exp)
16123 OK_For_Limited_Init_In_05
16124 (Typ, Expression (Original_Node (Exp)));
16126 when N_Indexed_Component |
16127 N_Selected_Component |
16128 N_Explicit_Dereference =>
16129 return Nkind (Exp) = N_Function_Call;
16131 -- A use of 'Input is a function call, hence allowed. Normally the
16132 -- attribute will be changed to a call, but the attribute by itself
16133 -- can occur with -gnatc.
16135 when N_Attribute_Reference =>
16136 return Attribute_Name (Original_Node (Exp)) = Name_Input;
16141 end OK_For_Limited_Init_In_05;
16143 -------------------------------------------
16144 -- Ordinary_Fixed_Point_Type_Declaration --
16145 -------------------------------------------
16147 procedure Ordinary_Fixed_Point_Type_Declaration
16151 Loc : constant Source_Ptr := Sloc (Def);
16152 Delta_Expr : constant Node_Id := Delta_Expression (Def);
16153 RRS : constant Node_Id := Real_Range_Specification (Def);
16154 Implicit_Base : Entity_Id;
16161 Check_Restriction (No_Fixed_Point, Def);
16163 -- Create implicit base type
16166 Create_Itype (E_Ordinary_Fixed_Point_Type, Parent (Def), T, 'B');
16167 Set_Etype (Implicit_Base, Implicit_Base);
16169 -- Analyze and process delta expression
16171 Analyze_And_Resolve (Delta_Expr, Any_Real);
16173 Check_Delta_Expression (Delta_Expr);
16174 Delta_Val := Expr_Value_R (Delta_Expr);
16176 Set_Delta_Value (Implicit_Base, Delta_Val);
16178 -- Compute default small from given delta, which is the largest power
16179 -- of two that does not exceed the given delta value.
16189 if Delta_Val < Ureal_1 then
16190 while Delta_Val < Tmp loop
16191 Tmp := Tmp / Ureal_2;
16192 Scale := Scale + 1;
16197 Tmp := Tmp * Ureal_2;
16198 exit when Tmp > Delta_Val;
16199 Scale := Scale - 1;
16203 Small_Val := UR_From_Components (Uint_1, UI_From_Int (Scale), 2);
16206 Set_Small_Value (Implicit_Base, Small_Val);
16208 -- If no range was given, set a dummy range
16210 if RRS <= Empty_Or_Error then
16211 Low_Val := -Small_Val;
16212 High_Val := Small_Val;
16214 -- Otherwise analyze and process given range
16218 Low : constant Node_Id := Low_Bound (RRS);
16219 High : constant Node_Id := High_Bound (RRS);
16222 Analyze_And_Resolve (Low, Any_Real);
16223 Analyze_And_Resolve (High, Any_Real);
16224 Check_Real_Bound (Low);
16225 Check_Real_Bound (High);
16227 -- Obtain and set the range
16229 Low_Val := Expr_Value_R (Low);
16230 High_Val := Expr_Value_R (High);
16232 if Low_Val > High_Val then
16233 Error_Msg_NE ("?fixed point type& has null range", Def, T);
16238 -- The range for both the implicit base and the declared first subtype
16239 -- cannot be set yet, so we use the special routine Set_Fixed_Range to
16240 -- set a temporary range in place. Note that the bounds of the base
16241 -- type will be widened to be symmetrical and to fill the available
16242 -- bits when the type is frozen.
16244 -- We could do this with all discrete types, and probably should, but
16245 -- we absolutely have to do it for fixed-point, since the end-points
16246 -- of the range and the size are determined by the small value, which
16247 -- could be reset before the freeze point.
16249 Set_Fixed_Range (Implicit_Base, Loc, Low_Val, High_Val);
16250 Set_Fixed_Range (T, Loc, Low_Val, High_Val);
16252 -- Complete definition of first subtype
16254 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
16255 Set_Etype (T, Implicit_Base);
16256 Init_Size_Align (T);
16257 Set_First_Rep_Item (T, First_Rep_Item (Implicit_Base));
16258 Set_Small_Value (T, Small_Val);
16259 Set_Delta_Value (T, Delta_Val);
16260 Set_Is_Constrained (T);
16262 end Ordinary_Fixed_Point_Type_Declaration;
16264 ----------------------------------------
16265 -- Prepare_Private_Subtype_Completion --
16266 ----------------------------------------
16268 procedure Prepare_Private_Subtype_Completion
16270 Related_Nod : Node_Id)
16272 Id_B : constant Entity_Id := Base_Type (Id);
16273 Full_B : constant Entity_Id := Full_View (Id_B);
16277 if Present (Full_B) then
16279 -- The Base_Type is already completed, we can complete the subtype
16280 -- now. We have to create a new entity with the same name, Thus we
16281 -- can't use Create_Itype.
16283 -- This is messy, should be fixed ???
16285 Full := Make_Defining_Identifier (Sloc (Id), Chars (Id));
16286 Set_Is_Itype (Full);
16287 Set_Associated_Node_For_Itype (Full, Related_Nod);
16288 Complete_Private_Subtype (Id, Full, Full_B, Related_Nod);
16291 -- The parent subtype may be private, but the base might not, in some
16292 -- nested instances. In that case, the subtype does not need to be
16293 -- exchanged. It would still be nice to make private subtypes and their
16294 -- bases consistent at all times ???
16296 if Is_Private_Type (Id_B) then
16297 Append_Elmt (Id, Private_Dependents (Id_B));
16300 end Prepare_Private_Subtype_Completion;
16302 ---------------------------
16303 -- Process_Discriminants --
16304 ---------------------------
16306 procedure Process_Discriminants
16308 Prev : Entity_Id := Empty)
16310 Elist : constant Elist_Id := New_Elmt_List;
16313 Discr_Number : Uint;
16314 Discr_Type : Entity_Id;
16315 Default_Present : Boolean := False;
16316 Default_Not_Present : Boolean := False;
16319 -- A composite type other than an array type can have discriminants.
16320 -- On entry, the current scope is the composite type.
16322 -- The discriminants are initially entered into the scope of the type
16323 -- via Enter_Name with the default Ekind of E_Void to prevent premature
16324 -- use, as explained at the end of this procedure.
16326 Discr := First (Discriminant_Specifications (N));
16327 while Present (Discr) loop
16328 Enter_Name (Defining_Identifier (Discr));
16330 -- For navigation purposes we add a reference to the discriminant
16331 -- in the entity for the type. If the current declaration is a
16332 -- completion, place references on the partial view. Otherwise the
16333 -- type is the current scope.
16335 if Present (Prev) then
16337 -- The references go on the partial view, if present. If the
16338 -- partial view has discriminants, the references have been
16339 -- generated already.
16341 if not Has_Discriminants (Prev) then
16342 Generate_Reference (Prev, Defining_Identifier (Discr), 'd');
16346 (Current_Scope, Defining_Identifier (Discr), 'd');
16349 if Nkind (Discriminant_Type (Discr)) = N_Access_Definition then
16350 Discr_Type := Access_Definition (Discr, Discriminant_Type (Discr));
16352 -- Ada 2005 (AI-254)
16354 if Present (Access_To_Subprogram_Definition
16355 (Discriminant_Type (Discr)))
16356 and then Protected_Present (Access_To_Subprogram_Definition
16357 (Discriminant_Type (Discr)))
16360 Replace_Anonymous_Access_To_Protected_Subprogram (Discr);
16364 Find_Type (Discriminant_Type (Discr));
16365 Discr_Type := Etype (Discriminant_Type (Discr));
16367 if Error_Posted (Discriminant_Type (Discr)) then
16368 Discr_Type := Any_Type;
16372 if Is_Access_Type (Discr_Type) then
16374 -- Ada 2005 (AI-230): Access discriminant allowed in non-limited
16377 if Ada_Version < Ada_2005 then
16378 Check_Access_Discriminant_Requires_Limited
16379 (Discr, Discriminant_Type (Discr));
16382 if Ada_Version = Ada_83 and then Comes_From_Source (Discr) then
16384 ("(Ada 83) access discriminant not allowed", Discr);
16387 elsif not Is_Discrete_Type (Discr_Type) then
16388 Error_Msg_N ("discriminants must have a discrete or access type",
16389 Discriminant_Type (Discr));
16392 Set_Etype (Defining_Identifier (Discr), Discr_Type);
16394 -- If a discriminant specification includes the assignment compound
16395 -- delimiter followed by an expression, the expression is the default
16396 -- expression of the discriminant; the default expression must be of
16397 -- the type of the discriminant. (RM 3.7.1) Since this expression is
16398 -- a default expression, we do the special preanalysis, since this
16399 -- expression does not freeze (see "Handling of Default and Per-
16400 -- Object Expressions" in spec of package Sem).
16402 if Present (Expression (Discr)) then
16403 Preanalyze_Spec_Expression (Expression (Discr), Discr_Type);
16405 if Nkind (N) = N_Formal_Type_Declaration then
16407 ("discriminant defaults not allowed for formal type",
16408 Expression (Discr));
16410 elsif Is_Tagged_Type (Current_Scope)
16411 and then Comes_From_Source (N)
16413 -- Note: see similar test in Check_Or_Process_Discriminants, to
16414 -- handle the (illegal) case of the completion of an untagged
16415 -- view with discriminants with defaults by a tagged full view.
16416 -- We skip the check if Discr does not come from source to
16417 -- account for the case of an untagged derived type providing
16418 -- defaults for a renamed discriminant from a private nontagged
16419 -- ancestor with a tagged full view (ACATS B460006).
16422 ("discriminants of tagged type cannot have defaults",
16423 Expression (Discr));
16426 Default_Present := True;
16427 Append_Elmt (Expression (Discr), Elist);
16429 -- Tag the defining identifiers for the discriminants with
16430 -- their corresponding default expressions from the tree.
16432 Set_Discriminant_Default_Value
16433 (Defining_Identifier (Discr), Expression (Discr));
16437 Default_Not_Present := True;
16440 -- Ada 2005 (AI-231): Create an Itype that is a duplicate of
16441 -- Discr_Type but with the null-exclusion attribute
16443 if Ada_Version >= Ada_2005 then
16445 -- Ada 2005 (AI-231): Static checks
16447 if Can_Never_Be_Null (Discr_Type) then
16448 Null_Exclusion_Static_Checks (Discr);
16450 elsif Is_Access_Type (Discr_Type)
16451 and then Null_Exclusion_Present (Discr)
16453 -- No need to check itypes because in their case this check
16454 -- was done at their point of creation
16456 and then not Is_Itype (Discr_Type)
16458 if Can_Never_Be_Null (Discr_Type) then
16460 ("`NOT NULL` not allowed (& already excludes null)",
16465 Set_Etype (Defining_Identifier (Discr),
16466 Create_Null_Excluding_Itype
16468 Related_Nod => Discr));
16470 -- Check for improper null exclusion if the type is otherwise
16471 -- legal for a discriminant.
16473 elsif Null_Exclusion_Present (Discr)
16474 and then Is_Discrete_Type (Discr_Type)
16477 ("null exclusion can only apply to an access type", Discr);
16480 -- Ada 2005 (AI-402): access discriminants of nonlimited types
16481 -- can't have defaults. Synchronized types, or types that are
16482 -- explicitly limited are fine, but special tests apply to derived
16483 -- types in generics: in a generic body we have to assume the
16484 -- worst, and therefore defaults are not allowed if the parent is
16485 -- a generic formal private type (see ACATS B370001).
16487 if Is_Access_Type (Discr_Type) then
16488 if Ekind (Discr_Type) /= E_Anonymous_Access_Type
16489 or else not Default_Present
16490 or else Is_Limited_Record (Current_Scope)
16491 or else Is_Concurrent_Type (Current_Scope)
16492 or else Is_Concurrent_Record_Type (Current_Scope)
16493 or else Ekind (Current_Scope) = E_Limited_Private_Type
16495 if not Is_Derived_Type (Current_Scope)
16496 or else not Is_Generic_Type (Etype (Current_Scope))
16497 or else not In_Package_Body (Scope (Etype (Current_Scope)))
16498 or else Limited_Present
16499 (Type_Definition (Parent (Current_Scope)))
16504 Error_Msg_N ("access discriminants of nonlimited types",
16505 Expression (Discr));
16506 Error_Msg_N ("\cannot have defaults", Expression (Discr));
16509 elsif Present (Expression (Discr)) then
16511 ("(Ada 2005) access discriminants of nonlimited types",
16512 Expression (Discr));
16513 Error_Msg_N ("\cannot have defaults", Expression (Discr));
16521 -- An element list consisting of the default expressions of the
16522 -- discriminants is constructed in the above loop and used to set
16523 -- the Discriminant_Constraint attribute for the type. If an object
16524 -- is declared of this (record or task) type without any explicit
16525 -- discriminant constraint given, this element list will form the
16526 -- actual parameters for the corresponding initialization procedure
16529 Set_Discriminant_Constraint (Current_Scope, Elist);
16530 Set_Stored_Constraint (Current_Scope, No_Elist);
16532 -- Default expressions must be provided either for all or for none
16533 -- of the discriminants of a discriminant part. (RM 3.7.1)
16535 if Default_Present and then Default_Not_Present then
16537 ("incomplete specification of defaults for discriminants", N);
16540 -- The use of the name of a discriminant is not allowed in default
16541 -- expressions of a discriminant part if the specification of the
16542 -- discriminant is itself given in the discriminant part. (RM 3.7.1)
16544 -- To detect this, the discriminant names are entered initially with an
16545 -- Ekind of E_Void (which is the default Ekind given by Enter_Name). Any
16546 -- attempt to use a void entity (for example in an expression that is
16547 -- type-checked) produces the error message: premature usage. Now after
16548 -- completing the semantic analysis of the discriminant part, we can set
16549 -- the Ekind of all the discriminants appropriately.
16551 Discr := First (Discriminant_Specifications (N));
16552 Discr_Number := Uint_1;
16553 while Present (Discr) loop
16554 Id := Defining_Identifier (Discr);
16555 Set_Ekind (Id, E_Discriminant);
16556 Init_Component_Location (Id);
16558 Set_Discriminant_Number (Id, Discr_Number);
16560 -- Make sure this is always set, even in illegal programs
16562 Set_Corresponding_Discriminant (Id, Empty);
16564 -- Initialize the Original_Record_Component to the entity itself.
16565 -- Inherit_Components will propagate the right value to
16566 -- discriminants in derived record types.
16568 Set_Original_Record_Component (Id, Id);
16570 -- Create the discriminal for the discriminant
16572 Build_Discriminal (Id);
16575 Discr_Number := Discr_Number + 1;
16578 Set_Has_Discriminants (Current_Scope);
16579 end Process_Discriminants;
16581 -----------------------
16582 -- Process_Full_View --
16583 -----------------------
16585 procedure Process_Full_View (N : Node_Id; Full_T, Priv_T : Entity_Id) is
16586 Priv_Parent : Entity_Id;
16587 Full_Parent : Entity_Id;
16588 Full_Indic : Node_Id;
16590 procedure Collect_Implemented_Interfaces
16592 Ifaces : Elist_Id);
16593 -- Ada 2005: Gather all the interfaces that Typ directly or
16594 -- inherently implements. Duplicate entries are not added to
16595 -- the list Ifaces.
16597 ------------------------------------
16598 -- Collect_Implemented_Interfaces --
16599 ------------------------------------
16601 procedure Collect_Implemented_Interfaces
16606 Iface_Elmt : Elmt_Id;
16609 -- Abstract interfaces are only associated with tagged record types
16611 if not Is_Tagged_Type (Typ)
16612 or else not Is_Record_Type (Typ)
16617 -- Recursively climb to the ancestors
16619 if Etype (Typ) /= Typ
16621 -- Protect the frontend against wrong cyclic declarations like:
16623 -- type B is new A with private;
16624 -- type C is new A with private;
16626 -- type B is new C with null record;
16627 -- type C is new B with null record;
16629 and then Etype (Typ) /= Priv_T
16630 and then Etype (Typ) /= Full_T
16632 -- Keep separate the management of private type declarations
16634 if Ekind (Typ) = E_Record_Type_With_Private then
16636 -- Handle the following erronous case:
16637 -- type Private_Type is tagged private;
16639 -- type Private_Type is new Type_Implementing_Iface;
16641 if Present (Full_View (Typ))
16642 and then Etype (Typ) /= Full_View (Typ)
16644 if Is_Interface (Etype (Typ)) then
16645 Append_Unique_Elmt (Etype (Typ), Ifaces);
16648 Collect_Implemented_Interfaces (Etype (Typ), Ifaces);
16651 -- Non-private types
16654 if Is_Interface (Etype (Typ)) then
16655 Append_Unique_Elmt (Etype (Typ), Ifaces);
16658 Collect_Implemented_Interfaces (Etype (Typ), Ifaces);
16662 -- Handle entities in the list of abstract interfaces
16664 if Present (Interfaces (Typ)) then
16665 Iface_Elmt := First_Elmt (Interfaces (Typ));
16666 while Present (Iface_Elmt) loop
16667 Iface := Node (Iface_Elmt);
16669 pragma Assert (Is_Interface (Iface));
16671 if not Contain_Interface (Iface, Ifaces) then
16672 Append_Elmt (Iface, Ifaces);
16673 Collect_Implemented_Interfaces (Iface, Ifaces);
16676 Next_Elmt (Iface_Elmt);
16679 end Collect_Implemented_Interfaces;
16681 -- Start of processing for Process_Full_View
16684 -- First some sanity checks that must be done after semantic
16685 -- decoration of the full view and thus cannot be placed with other
16686 -- similar checks in Find_Type_Name
16688 if not Is_Limited_Type (Priv_T)
16689 and then (Is_Limited_Type (Full_T)
16690 or else Is_Limited_Composite (Full_T))
16693 ("completion of nonlimited type cannot be limited", Full_T);
16694 Explain_Limited_Type (Full_T, Full_T);
16696 elsif Is_Abstract_Type (Full_T)
16697 and then not Is_Abstract_Type (Priv_T)
16700 ("completion of nonabstract type cannot be abstract", Full_T);
16702 elsif Is_Tagged_Type (Priv_T)
16703 and then Is_Limited_Type (Priv_T)
16704 and then not Is_Limited_Type (Full_T)
16706 -- If pragma CPP_Class was applied to the private declaration
16707 -- propagate the limitedness to the full-view
16709 if Is_CPP_Class (Priv_T) then
16710 Set_Is_Limited_Record (Full_T);
16712 -- GNAT allow its own definition of Limited_Controlled to disobey
16713 -- this rule in order in ease the implementation. The next test is
16714 -- safe because Root_Controlled is defined in a private system child
16716 elsif Etype (Full_T) = Full_View (RTE (RE_Root_Controlled)) then
16717 Set_Is_Limited_Composite (Full_T);
16720 ("completion of limited tagged type must be limited", Full_T);
16723 elsif Is_Generic_Type (Priv_T) then
16724 Error_Msg_N ("generic type cannot have a completion", Full_T);
16727 -- Check that ancestor interfaces of private and full views are
16728 -- consistent. We omit this check for synchronized types because
16729 -- they are performed on the corresponding record type when frozen.
16731 if Ada_Version >= Ada_2005
16732 and then Is_Tagged_Type (Priv_T)
16733 and then Is_Tagged_Type (Full_T)
16734 and then not Is_Concurrent_Type (Full_T)
16738 Priv_T_Ifaces : constant Elist_Id := New_Elmt_List;
16739 Full_T_Ifaces : constant Elist_Id := New_Elmt_List;
16742 Collect_Implemented_Interfaces (Priv_T, Priv_T_Ifaces);
16743 Collect_Implemented_Interfaces (Full_T, Full_T_Ifaces);
16745 -- Ada 2005 (AI-251): The partial view shall be a descendant of
16746 -- an interface type if and only if the full type is descendant
16747 -- of the interface type (AARM 7.3 (7.3/2).
16749 Iface := Find_Hidden_Interface (Priv_T_Ifaces, Full_T_Ifaces);
16751 if Present (Iface) then
16753 ("interface & not implemented by full type " &
16754 "(RM-2005 7.3 (7.3/2))", Priv_T, Iface);
16757 Iface := Find_Hidden_Interface (Full_T_Ifaces, Priv_T_Ifaces);
16759 if Present (Iface) then
16761 ("interface & not implemented by partial view " &
16762 "(RM-2005 7.3 (7.3/2))", Full_T, Iface);
16767 if Is_Tagged_Type (Priv_T)
16768 and then Nkind (Parent (Priv_T)) = N_Private_Extension_Declaration
16769 and then Is_Derived_Type (Full_T)
16771 Priv_Parent := Etype (Priv_T);
16773 -- The full view of a private extension may have been transformed
16774 -- into an unconstrained derived type declaration and a subtype
16775 -- declaration (see build_derived_record_type for details).
16777 if Nkind (N) = N_Subtype_Declaration then
16778 Full_Indic := Subtype_Indication (N);
16779 Full_Parent := Etype (Base_Type (Full_T));
16781 Full_Indic := Subtype_Indication (Type_Definition (N));
16782 Full_Parent := Etype (Full_T);
16785 -- Check that the parent type of the full type is a descendant of
16786 -- the ancestor subtype given in the private extension. If either
16787 -- entity has an Etype equal to Any_Type then we had some previous
16788 -- error situation [7.3(8)].
16790 if Priv_Parent = Any_Type or else Full_Parent = Any_Type then
16793 -- Ada 2005 (AI-251): Interfaces in the full-typ can be given in
16794 -- any order. Therefore we don't have to check that its parent must
16795 -- be a descendant of the parent of the private type declaration.
16797 elsif Is_Interface (Priv_Parent)
16798 and then Is_Interface (Full_Parent)
16802 -- Ada 2005 (AI-251): If the parent of the private type declaration
16803 -- is an interface there is no need to check that it is an ancestor
16804 -- of the associated full type declaration. The required tests for
16805 -- this case are performed by Build_Derived_Record_Type.
16807 elsif not Is_Interface (Base_Type (Priv_Parent))
16808 and then not Is_Ancestor (Base_Type (Priv_Parent), Full_Parent)
16811 ("parent of full type must descend from parent"
16812 & " of private extension", Full_Indic);
16814 -- Check the rules of 7.3(10): if the private extension inherits
16815 -- known discriminants, then the full type must also inherit those
16816 -- discriminants from the same (ancestor) type, and the parent
16817 -- subtype of the full type must be constrained if and only if
16818 -- the ancestor subtype of the private extension is constrained.
16820 elsif No (Discriminant_Specifications (Parent (Priv_T)))
16821 and then not Has_Unknown_Discriminants (Priv_T)
16822 and then Has_Discriminants (Base_Type (Priv_Parent))
16825 Priv_Indic : constant Node_Id :=
16826 Subtype_Indication (Parent (Priv_T));
16828 Priv_Constr : constant Boolean :=
16829 Is_Constrained (Priv_Parent)
16831 Nkind (Priv_Indic) = N_Subtype_Indication
16832 or else Is_Constrained (Entity (Priv_Indic));
16834 Full_Constr : constant Boolean :=
16835 Is_Constrained (Full_Parent)
16837 Nkind (Full_Indic) = N_Subtype_Indication
16838 or else Is_Constrained (Entity (Full_Indic));
16840 Priv_Discr : Entity_Id;
16841 Full_Discr : Entity_Id;
16844 Priv_Discr := First_Discriminant (Priv_Parent);
16845 Full_Discr := First_Discriminant (Full_Parent);
16846 while Present (Priv_Discr) and then Present (Full_Discr) loop
16847 if Original_Record_Component (Priv_Discr) =
16848 Original_Record_Component (Full_Discr)
16850 Corresponding_Discriminant (Priv_Discr) =
16851 Corresponding_Discriminant (Full_Discr)
16858 Next_Discriminant (Priv_Discr);
16859 Next_Discriminant (Full_Discr);
16862 if Present (Priv_Discr) or else Present (Full_Discr) then
16864 ("full view must inherit discriminants of the parent type"
16865 & " used in the private extension", Full_Indic);
16867 elsif Priv_Constr and then not Full_Constr then
16869 ("parent subtype of full type must be constrained",
16872 elsif Full_Constr and then not Priv_Constr then
16874 ("parent subtype of full type must be unconstrained",
16879 -- Check the rules of 7.3(12): if a partial view has neither known
16880 -- or unknown discriminants, then the full type declaration shall
16881 -- define a definite subtype.
16883 elsif not Has_Unknown_Discriminants (Priv_T)
16884 and then not Has_Discriminants (Priv_T)
16885 and then not Is_Constrained (Full_T)
16888 ("full view must define a constrained type if partial view"
16889 & " has no discriminants", Full_T);
16892 -- ??????? Do we implement the following properly ?????
16893 -- If the ancestor subtype of a private extension has constrained
16894 -- discriminants, then the parent subtype of the full view shall
16895 -- impose a statically matching constraint on those discriminants
16899 -- For untagged types, verify that a type without discriminants
16900 -- is not completed with an unconstrained type.
16902 if not Is_Indefinite_Subtype (Priv_T)
16903 and then Is_Indefinite_Subtype (Full_T)
16905 Error_Msg_N ("full view of type must be definite subtype", Full_T);
16909 -- AI-419: verify that the use of "limited" is consistent
16912 Orig_Decl : constant Node_Id := Original_Node (N);
16915 if Nkind (Parent (Priv_T)) = N_Private_Extension_Declaration
16916 and then not Limited_Present (Parent (Priv_T))
16917 and then not Synchronized_Present (Parent (Priv_T))
16918 and then Nkind (Orig_Decl) = N_Full_Type_Declaration
16920 (Type_Definition (Orig_Decl)) = N_Derived_Type_Definition
16921 and then Limited_Present (Type_Definition (Orig_Decl))
16924 ("full view of non-limited extension cannot be limited", N);
16928 -- Ada 2005 (AI-443): A synchronized private extension must be
16929 -- completed by a task or protected type.
16931 if Ada_Version >= Ada_2005
16932 and then Nkind (Parent (Priv_T)) = N_Private_Extension_Declaration
16933 and then Synchronized_Present (Parent (Priv_T))
16934 and then not Is_Concurrent_Type (Full_T)
16936 Error_Msg_N ("full view of synchronized extension must " &
16937 "be synchronized type", N);
16940 -- Ada 2005 AI-363: if the full view has discriminants with
16941 -- defaults, it is illegal to declare constrained access subtypes
16942 -- whose designated type is the current type. This allows objects
16943 -- of the type that are declared in the heap to be unconstrained.
16945 if not Has_Unknown_Discriminants (Priv_T)
16946 and then not Has_Discriminants (Priv_T)
16947 and then Has_Discriminants (Full_T)
16949 Present (Discriminant_Default_Value (First_Discriminant (Full_T)))
16951 Set_Has_Constrained_Partial_View (Full_T);
16952 Set_Has_Constrained_Partial_View (Priv_T);
16955 -- Create a full declaration for all its subtypes recorded in
16956 -- Private_Dependents and swap them similarly to the base type. These
16957 -- are subtypes that have been define before the full declaration of
16958 -- the private type. We also swap the entry in Private_Dependents list
16959 -- so we can properly restore the private view on exit from the scope.
16962 Priv_Elmt : Elmt_Id;
16967 Priv_Elmt := First_Elmt (Private_Dependents (Priv_T));
16968 while Present (Priv_Elmt) loop
16969 Priv := Node (Priv_Elmt);
16971 if Ekind_In (Priv, E_Private_Subtype,
16972 E_Limited_Private_Subtype,
16973 E_Record_Subtype_With_Private)
16975 Full := Make_Defining_Identifier (Sloc (Priv), Chars (Priv));
16976 Set_Is_Itype (Full);
16977 Set_Parent (Full, Parent (Priv));
16978 Set_Associated_Node_For_Itype (Full, N);
16980 -- Now we need to complete the private subtype, but since the
16981 -- base type has already been swapped, we must also swap the
16982 -- subtypes (and thus, reverse the arguments in the call to
16983 -- Complete_Private_Subtype).
16985 Copy_And_Swap (Priv, Full);
16986 Complete_Private_Subtype (Full, Priv, Full_T, N);
16987 Replace_Elmt (Priv_Elmt, Full);
16990 Next_Elmt (Priv_Elmt);
16994 -- If the private view was tagged, copy the new primitive operations
16995 -- from the private view to the full view.
16997 if Is_Tagged_Type (Full_T) then
16999 Disp_Typ : Entity_Id;
17000 Full_List : Elist_Id;
17002 Prim_Elmt : Elmt_Id;
17003 Priv_List : Elist_Id;
17007 L : Elist_Id) return Boolean;
17008 -- Determine whether list L contains element E
17016 L : Elist_Id) return Boolean
17018 List_Elmt : Elmt_Id;
17021 List_Elmt := First_Elmt (L);
17022 while Present (List_Elmt) loop
17023 if Node (List_Elmt) = E then
17027 Next_Elmt (List_Elmt);
17033 -- Start of processing
17036 if Is_Tagged_Type (Priv_T) then
17037 Priv_List := Primitive_Operations (Priv_T);
17038 Prim_Elmt := First_Elmt (Priv_List);
17040 -- In the case of a concurrent type completing a private tagged
17041 -- type, primitives may have been declared in between the two
17042 -- views. These subprograms need to be wrapped the same way
17043 -- entries and protected procedures are handled because they
17044 -- cannot be directly shared by the two views.
17046 if Is_Concurrent_Type (Full_T) then
17048 Conc_Typ : constant Entity_Id :=
17049 Corresponding_Record_Type (Full_T);
17050 Curr_Nod : Node_Id := Parent (Conc_Typ);
17051 Wrap_Spec : Node_Id;
17054 while Present (Prim_Elmt) loop
17055 Prim := Node (Prim_Elmt);
17057 if Comes_From_Source (Prim)
17058 and then not Is_Abstract_Subprogram (Prim)
17061 Make_Subprogram_Declaration (Sloc (Prim),
17065 Obj_Typ => Conc_Typ,
17067 Parameter_Specifications (
17070 Insert_After (Curr_Nod, Wrap_Spec);
17071 Curr_Nod := Wrap_Spec;
17073 Analyze (Wrap_Spec);
17076 Next_Elmt (Prim_Elmt);
17082 -- For non-concurrent types, transfer explicit primitives, but
17083 -- omit those inherited from the parent of the private view
17084 -- since they will be re-inherited later on.
17087 Full_List := Primitive_Operations (Full_T);
17089 while Present (Prim_Elmt) loop
17090 Prim := Node (Prim_Elmt);
17092 if Comes_From_Source (Prim)
17093 and then not Contains (Prim, Full_List)
17095 Append_Elmt (Prim, Full_List);
17098 Next_Elmt (Prim_Elmt);
17102 -- Untagged private view
17105 Full_List := Primitive_Operations (Full_T);
17107 -- In this case the partial view is untagged, so here we locate
17108 -- all of the earlier primitives that need to be treated as
17109 -- dispatching (those that appear between the two views). Note
17110 -- that these additional operations must all be new operations
17111 -- (any earlier operations that override inherited operations
17112 -- of the full view will already have been inserted in the
17113 -- primitives list, marked by Check_Operation_From_Private_View
17114 -- as dispatching. Note that implicit "/=" operators are
17115 -- excluded from being added to the primitives list since they
17116 -- shouldn't be treated as dispatching (tagged "/=" is handled
17119 Prim := Next_Entity (Full_T);
17120 while Present (Prim) and then Prim /= Priv_T loop
17121 if Ekind_In (Prim, E_Procedure, E_Function) then
17122 Disp_Typ := Find_Dispatching_Type (Prim);
17124 if Disp_Typ = Full_T
17125 and then (Chars (Prim) /= Name_Op_Ne
17126 or else Comes_From_Source (Prim))
17128 Check_Controlling_Formals (Full_T, Prim);
17130 if not Is_Dispatching_Operation (Prim) then
17131 Append_Elmt (Prim, Full_List);
17132 Set_Is_Dispatching_Operation (Prim, True);
17133 Set_DT_Position (Prim, No_Uint);
17136 elsif Is_Dispatching_Operation (Prim)
17137 and then Disp_Typ /= Full_T
17140 -- Verify that it is not otherwise controlled by a
17141 -- formal or a return value of type T.
17143 Check_Controlling_Formals (Disp_Typ, Prim);
17147 Next_Entity (Prim);
17151 -- For the tagged case, the two views can share the same primitive
17152 -- operations list and the same class-wide type. Update attributes
17153 -- of the class-wide type which depend on the full declaration.
17155 if Is_Tagged_Type (Priv_T) then
17156 Set_Direct_Primitive_Operations (Priv_T, Full_List);
17157 Set_Class_Wide_Type
17158 (Base_Type (Full_T), Class_Wide_Type (Priv_T));
17160 Set_Has_Task (Class_Wide_Type (Priv_T), Has_Task (Full_T));
17165 -- Ada 2005 AI 161: Check preelaboratable initialization consistency
17167 if Known_To_Have_Preelab_Init (Priv_T) then
17169 -- Case where there is a pragma Preelaborable_Initialization. We
17170 -- always allow this in predefined units, which is a bit of a kludge,
17171 -- but it means we don't have to struggle to meet the requirements in
17172 -- the RM for having Preelaborable Initialization. Otherwise we
17173 -- require that the type meets the RM rules. But we can't check that
17174 -- yet, because of the rule about overriding Ininitialize, so we
17175 -- simply set a flag that will be checked at freeze time.
17177 if not In_Predefined_Unit (Full_T) then
17178 Set_Must_Have_Preelab_Init (Full_T);
17182 -- If pragma CPP_Class was applied to the private type declaration,
17183 -- propagate it now to the full type declaration.
17185 if Is_CPP_Class (Priv_T) then
17186 Set_Is_CPP_Class (Full_T);
17187 Set_Convention (Full_T, Convention_CPP);
17190 -- If the private view has user specified stream attributes, then so has
17193 -- Why the test, how could these flags be already set in Full_T ???
17195 if Has_Specified_Stream_Read (Priv_T) then
17196 Set_Has_Specified_Stream_Read (Full_T);
17199 if Has_Specified_Stream_Write (Priv_T) then
17200 Set_Has_Specified_Stream_Write (Full_T);
17203 if Has_Specified_Stream_Input (Priv_T) then
17204 Set_Has_Specified_Stream_Input (Full_T);
17207 if Has_Specified_Stream_Output (Priv_T) then
17208 Set_Has_Specified_Stream_Output (Full_T);
17211 -- Deal with invariants
17213 if Has_Invariants (Full_T)
17215 Has_Invariants (Priv_T)
17217 Set_Has_Invariants (Full_T);
17218 Set_Has_Invariants (Priv_T);
17221 if Has_Inheritable_Invariants (Full_T)
17223 Has_Inheritable_Invariants (Priv_T)
17225 Set_Has_Inheritable_Invariants (Full_T);
17226 Set_Has_Inheritable_Invariants (Priv_T);
17229 -- This is where we build the invariant procedure if needed
17231 if Has_Invariants (Priv_T) then
17235 Packg : constant Node_Id := Declaration_Node (Scope (Priv_T));
17238 Build_Invariant_Procedure (Full_T, PDecl, PBody);
17240 -- Error defense, normally these should be set
17242 if Present (PDecl) and then Present (PBody) then
17244 -- Spec goes at the end of the public part of the package.
17245 -- That's behind us, so we have to manually analyze the
17248 Append_To (Visible_Declarations (Packg), PDecl);
17251 -- Body goes at the end of the private part of the package.
17252 -- That's ahead of us so it will get analyzed later on when
17255 Append_To (Private_Declarations (Packg), PBody);
17257 -- Copy Invariant procedure to private declaration
17259 Set_Invariant_Procedure (Priv_T, Invariant_Procedure (Full_T));
17260 Set_Has_Invariants (Priv_T);
17265 -- Propagate predicates to full type
17267 if Has_Predicates (Priv_T) then
17268 Set_Predicate_Function (Priv_T, Predicate_Function (Full_T));
17269 Set_Has_Predicates (Priv_T);
17271 end Process_Full_View;
17273 -----------------------------------
17274 -- Process_Incomplete_Dependents --
17275 -----------------------------------
17277 procedure Process_Incomplete_Dependents
17279 Full_T : Entity_Id;
17282 Inc_Elmt : Elmt_Id;
17283 Priv_Dep : Entity_Id;
17284 New_Subt : Entity_Id;
17286 Disc_Constraint : Elist_Id;
17289 if No (Private_Dependents (Inc_T)) then
17293 -- Itypes that may be generated by the completion of an incomplete
17294 -- subtype are not used by the back-end and not attached to the tree.
17295 -- They are created only for constraint-checking purposes.
17297 Inc_Elmt := First_Elmt (Private_Dependents (Inc_T));
17298 while Present (Inc_Elmt) loop
17299 Priv_Dep := Node (Inc_Elmt);
17301 if Ekind (Priv_Dep) = E_Subprogram_Type then
17303 -- An Access_To_Subprogram type may have a return type or a
17304 -- parameter type that is incomplete. Replace with the full view.
17306 if Etype (Priv_Dep) = Inc_T then
17307 Set_Etype (Priv_Dep, Full_T);
17311 Formal : Entity_Id;
17314 Formal := First_Formal (Priv_Dep);
17315 while Present (Formal) loop
17316 if Etype (Formal) = Inc_T then
17317 Set_Etype (Formal, Full_T);
17320 Next_Formal (Formal);
17324 elsif Is_Overloadable (Priv_Dep) then
17326 -- A protected operation is never dispatching: only its
17327 -- wrapper operation (which has convention Ada) is.
17329 if Is_Tagged_Type (Full_T)
17330 and then Convention (Priv_Dep) /= Convention_Protected
17333 -- Subprogram has an access parameter whose designated type
17334 -- was incomplete. Reexamine declaration now, because it may
17335 -- be a primitive operation of the full type.
17337 Check_Operation_From_Incomplete_Type (Priv_Dep, Inc_T);
17338 Set_Is_Dispatching_Operation (Priv_Dep);
17339 Check_Controlling_Formals (Full_T, Priv_Dep);
17342 elsif Ekind (Priv_Dep) = E_Subprogram_Body then
17344 -- Can happen during processing of a body before the completion
17345 -- of a TA type. Ignore, because spec is also on dependent list.
17349 -- Ada 2005 (AI-412): Transform a regular incomplete subtype into a
17350 -- corresponding subtype of the full view.
17352 elsif Ekind (Priv_Dep) = E_Incomplete_Subtype then
17353 Set_Subtype_Indication
17354 (Parent (Priv_Dep), New_Reference_To (Full_T, Sloc (Priv_Dep)));
17355 Set_Etype (Priv_Dep, Full_T);
17356 Set_Ekind (Priv_Dep, Subtype_Kind (Ekind (Full_T)));
17357 Set_Analyzed (Parent (Priv_Dep), False);
17359 -- Reanalyze the declaration, suppressing the call to
17360 -- Enter_Name to avoid duplicate names.
17362 Analyze_Subtype_Declaration
17363 (N => Parent (Priv_Dep),
17366 -- Dependent is a subtype
17369 -- We build a new subtype indication using the full view of the
17370 -- incomplete parent. The discriminant constraints have been
17371 -- elaborated already at the point of the subtype declaration.
17373 New_Subt := Create_Itype (E_Void, N);
17375 if Has_Discriminants (Full_T) then
17376 Disc_Constraint := Discriminant_Constraint (Priv_Dep);
17378 Disc_Constraint := No_Elist;
17381 Build_Discriminated_Subtype (Full_T, New_Subt, Disc_Constraint, N);
17382 Set_Full_View (Priv_Dep, New_Subt);
17385 Next_Elmt (Inc_Elmt);
17387 end Process_Incomplete_Dependents;
17389 --------------------------------
17390 -- Process_Range_Expr_In_Decl --
17391 --------------------------------
17393 procedure Process_Range_Expr_In_Decl
17396 Check_List : List_Id := Empty_List;
17397 R_Check_Off : Boolean := False)
17400 R_Checks : Check_Result;
17401 Type_Decl : Node_Id;
17402 Def_Id : Entity_Id;
17405 Analyze_And_Resolve (R, Base_Type (T));
17407 if Nkind (R) = N_Range then
17408 Lo := Low_Bound (R);
17409 Hi := High_Bound (R);
17411 -- We need to ensure validity of the bounds here, because if we
17412 -- go ahead and do the expansion, then the expanded code will get
17413 -- analyzed with range checks suppressed and we miss the check.
17415 Validity_Check_Range (R);
17417 -- If there were errors in the declaration, try and patch up some
17418 -- common mistakes in the bounds. The cases handled are literals
17419 -- which are Integer where the expected type is Real and vice versa.
17420 -- These corrections allow the compilation process to proceed further
17421 -- along since some basic assumptions of the format of the bounds
17424 if Etype (R) = Any_Type then
17426 if Nkind (Lo) = N_Integer_Literal and then Is_Real_Type (T) then
17428 Make_Real_Literal (Sloc (Lo), UR_From_Uint (Intval (Lo))));
17430 elsif Nkind (Hi) = N_Integer_Literal and then Is_Real_Type (T) then
17432 Make_Real_Literal (Sloc (Hi), UR_From_Uint (Intval (Hi))));
17434 elsif Nkind (Lo) = N_Real_Literal and then Is_Integer_Type (T) then
17436 Make_Integer_Literal (Sloc (Lo), UR_To_Uint (Realval (Lo))));
17438 elsif Nkind (Hi) = N_Real_Literal and then Is_Integer_Type (T) then
17440 Make_Integer_Literal (Sloc (Hi), UR_To_Uint (Realval (Hi))));
17447 -- If the bounds of the range have been mistakenly given as string
17448 -- literals (perhaps in place of character literals), then an error
17449 -- has already been reported, but we rewrite the string literal as a
17450 -- bound of the range's type to avoid blowups in later processing
17451 -- that looks at static values.
17453 if Nkind (Lo) = N_String_Literal then
17455 Make_Attribute_Reference (Sloc (Lo),
17456 Attribute_Name => Name_First,
17457 Prefix => New_Reference_To (T, Sloc (Lo))));
17458 Analyze_And_Resolve (Lo);
17461 if Nkind (Hi) = N_String_Literal then
17463 Make_Attribute_Reference (Sloc (Hi),
17464 Attribute_Name => Name_First,
17465 Prefix => New_Reference_To (T, Sloc (Hi))));
17466 Analyze_And_Resolve (Hi);
17469 -- If bounds aren't scalar at this point then exit, avoiding
17470 -- problems with further processing of the range in this procedure.
17472 if not Is_Scalar_Type (Etype (Lo)) then
17476 -- Resolve (actually Sem_Eval) has checked that the bounds are in
17477 -- then range of the base type. Here we check whether the bounds
17478 -- are in the range of the subtype itself. Note that if the bounds
17479 -- represent the null range the Constraint_Error exception should
17482 -- ??? The following code should be cleaned up as follows
17484 -- 1. The Is_Null_Range (Lo, Hi) test should disappear since it
17485 -- is done in the call to Range_Check (R, T); below
17487 -- 2. The use of R_Check_Off should be investigated and possibly
17488 -- removed, this would clean up things a bit.
17490 if Is_Null_Range (Lo, Hi) then
17494 -- Capture values of bounds and generate temporaries for them
17495 -- if needed, before applying checks, since checks may cause
17496 -- duplication of the expression without forcing evaluation.
17498 if Expander_Active then
17499 Force_Evaluation (Lo);
17500 Force_Evaluation (Hi);
17503 -- We use a flag here instead of suppressing checks on the
17504 -- type because the type we check against isn't necessarily
17505 -- the place where we put the check.
17507 if not R_Check_Off then
17508 R_Checks := Get_Range_Checks (R, T);
17510 -- Look up tree to find an appropriate insertion point.
17511 -- This seems really junk code, and very brittle, couldn't
17512 -- we just use an insert actions call of some kind ???
17514 Type_Decl := Parent (R);
17515 while Present (Type_Decl) and then not
17516 (Nkind_In (Type_Decl, N_Full_Type_Declaration,
17517 N_Subtype_Declaration,
17519 N_Task_Type_Declaration)
17521 Nkind_In (Type_Decl, N_Single_Task_Declaration,
17522 N_Protected_Type_Declaration,
17523 N_Single_Protected_Declaration))
17525 Type_Decl := Parent (Type_Decl);
17528 -- Why would Type_Decl not be present??? Without this test,
17529 -- short regression tests fail.
17531 if Present (Type_Decl) then
17533 -- Case of loop statement (more comments ???)
17535 if Nkind (Type_Decl) = N_Loop_Statement then
17540 Indic := Parent (R);
17541 while Present (Indic)
17542 and then Nkind (Indic) /= N_Subtype_Indication
17544 Indic := Parent (Indic);
17547 if Present (Indic) then
17548 Def_Id := Etype (Subtype_Mark (Indic));
17550 Insert_Range_Checks
17556 Do_Before => True);
17560 -- All other cases (more comments ???)
17563 Def_Id := Defining_Identifier (Type_Decl);
17565 if (Ekind (Def_Id) = E_Record_Type
17566 and then Depends_On_Discriminant (R))
17568 (Ekind (Def_Id) = E_Protected_Type
17569 and then Has_Discriminants (Def_Id))
17571 Append_Range_Checks
17572 (R_Checks, Check_List, Def_Id, Sloc (Type_Decl), R);
17575 Insert_Range_Checks
17576 (R_Checks, Type_Decl, Def_Id, Sloc (Type_Decl), R);
17584 elsif Expander_Active then
17585 Get_Index_Bounds (R, Lo, Hi);
17586 Force_Evaluation (Lo);
17587 Force_Evaluation (Hi);
17589 end Process_Range_Expr_In_Decl;
17591 --------------------------------------
17592 -- Process_Real_Range_Specification --
17593 --------------------------------------
17595 procedure Process_Real_Range_Specification (Def : Node_Id) is
17596 Spec : constant Node_Id := Real_Range_Specification (Def);
17599 Err : Boolean := False;
17601 procedure Analyze_Bound (N : Node_Id);
17602 -- Analyze and check one bound
17604 -------------------
17605 -- Analyze_Bound --
17606 -------------------
17608 procedure Analyze_Bound (N : Node_Id) is
17610 Analyze_And_Resolve (N, Any_Real);
17612 if not Is_OK_Static_Expression (N) then
17613 Flag_Non_Static_Expr
17614 ("bound in real type definition is not static!", N);
17619 -- Start of processing for Process_Real_Range_Specification
17622 if Present (Spec) then
17623 Lo := Low_Bound (Spec);
17624 Hi := High_Bound (Spec);
17625 Analyze_Bound (Lo);
17626 Analyze_Bound (Hi);
17628 -- If error, clear away junk range specification
17631 Set_Real_Range_Specification (Def, Empty);
17634 end Process_Real_Range_Specification;
17636 ---------------------
17637 -- Process_Subtype --
17638 ---------------------
17640 function Process_Subtype
17642 Related_Nod : Node_Id;
17643 Related_Id : Entity_Id := Empty;
17644 Suffix : Character := ' ') return Entity_Id
17647 Def_Id : Entity_Id;
17648 Error_Node : Node_Id;
17649 Full_View_Id : Entity_Id;
17650 Subtype_Mark_Id : Entity_Id;
17652 May_Have_Null_Exclusion : Boolean;
17654 procedure Check_Incomplete (T : Entity_Id);
17655 -- Called to verify that an incomplete type is not used prematurely
17657 ----------------------
17658 -- Check_Incomplete --
17659 ----------------------
17661 procedure Check_Incomplete (T : Entity_Id) is
17663 -- Ada 2005 (AI-412): Incomplete subtypes are legal
17665 if Ekind (Root_Type (Entity (T))) = E_Incomplete_Type
17667 not (Ada_Version >= Ada_2005
17669 (Nkind (Parent (T)) = N_Subtype_Declaration
17671 (Nkind (Parent (T)) = N_Subtype_Indication
17672 and then Nkind (Parent (Parent (T))) =
17673 N_Subtype_Declaration)))
17675 Error_Msg_N ("invalid use of type before its full declaration", T);
17677 end Check_Incomplete;
17679 -- Start of processing for Process_Subtype
17682 -- Case of no constraints present
17684 if Nkind (S) /= N_Subtype_Indication then
17686 Check_Incomplete (S);
17689 -- Ada 2005 (AI-231): Static check
17691 if Ada_Version >= Ada_2005
17692 and then Present (P)
17693 and then Null_Exclusion_Present (P)
17694 and then Nkind (P) /= N_Access_To_Object_Definition
17695 and then not Is_Access_Type (Entity (S))
17697 Error_Msg_N ("`NOT NULL` only allowed for an access type", S);
17700 -- The following is ugly, can't we have a range or even a flag???
17702 May_Have_Null_Exclusion :=
17703 Nkind_In (P, N_Access_Definition,
17704 N_Access_Function_Definition,
17705 N_Access_Procedure_Definition,
17706 N_Access_To_Object_Definition,
17708 N_Component_Definition)
17710 Nkind_In (P, N_Derived_Type_Definition,
17711 N_Discriminant_Specification,
17712 N_Formal_Object_Declaration,
17713 N_Object_Declaration,
17714 N_Object_Renaming_Declaration,
17715 N_Parameter_Specification,
17716 N_Subtype_Declaration);
17718 -- Create an Itype that is a duplicate of Entity (S) but with the
17719 -- null-exclusion attribute.
17721 if May_Have_Null_Exclusion
17722 and then Is_Access_Type (Entity (S))
17723 and then Null_Exclusion_Present (P)
17725 -- No need to check the case of an access to object definition.
17726 -- It is correct to define double not-null pointers.
17729 -- type Not_Null_Int_Ptr is not null access Integer;
17730 -- type Acc is not null access Not_Null_Int_Ptr;
17732 and then Nkind (P) /= N_Access_To_Object_Definition
17734 if Can_Never_Be_Null (Entity (S)) then
17735 case Nkind (Related_Nod) is
17736 when N_Full_Type_Declaration =>
17737 if Nkind (Type_Definition (Related_Nod))
17738 in N_Array_Type_Definition
17742 (Component_Definition
17743 (Type_Definition (Related_Nod)));
17746 Subtype_Indication (Type_Definition (Related_Nod));
17749 when N_Subtype_Declaration =>
17750 Error_Node := Subtype_Indication (Related_Nod);
17752 when N_Object_Declaration =>
17753 Error_Node := Object_Definition (Related_Nod);
17755 when N_Component_Declaration =>
17757 Subtype_Indication (Component_Definition (Related_Nod));
17759 when N_Allocator =>
17760 Error_Node := Expression (Related_Nod);
17763 pragma Assert (False);
17764 Error_Node := Related_Nod;
17768 ("`NOT NULL` not allowed (& already excludes null)",
17774 Create_Null_Excluding_Itype
17776 Related_Nod => P));
17777 Set_Entity (S, Etype (S));
17782 -- Case of constraint present, so that we have an N_Subtype_Indication
17783 -- node (this node is created only if constraints are present).
17786 Find_Type (Subtype_Mark (S));
17788 if Nkind (Parent (S)) /= N_Access_To_Object_Definition
17790 (Nkind (Parent (S)) = N_Subtype_Declaration
17791 and then Is_Itype (Defining_Identifier (Parent (S))))
17793 Check_Incomplete (Subtype_Mark (S));
17797 Subtype_Mark_Id := Entity (Subtype_Mark (S));
17799 -- Explicit subtype declaration case
17801 if Nkind (P) = N_Subtype_Declaration then
17802 Def_Id := Defining_Identifier (P);
17804 -- Explicit derived type definition case
17806 elsif Nkind (P) = N_Derived_Type_Definition then
17807 Def_Id := Defining_Identifier (Parent (P));
17809 -- Implicit case, the Def_Id must be created as an implicit type.
17810 -- The one exception arises in the case of concurrent types, array
17811 -- and access types, where other subsidiary implicit types may be
17812 -- created and must appear before the main implicit type. In these
17813 -- cases we leave Def_Id set to Empty as a signal that Create_Itype
17814 -- has not yet been called to create Def_Id.
17817 if Is_Array_Type (Subtype_Mark_Id)
17818 or else Is_Concurrent_Type (Subtype_Mark_Id)
17819 or else Is_Access_Type (Subtype_Mark_Id)
17823 -- For the other cases, we create a new unattached Itype,
17824 -- and set the indication to ensure it gets attached later.
17828 Create_Itype (E_Void, Related_Nod, Related_Id, Suffix);
17832 -- If the kind of constraint is invalid for this kind of type,
17833 -- then give an error, and then pretend no constraint was given.
17835 if not Is_Valid_Constraint_Kind
17836 (Ekind (Subtype_Mark_Id), Nkind (Constraint (S)))
17839 ("incorrect constraint for this kind of type", Constraint (S));
17841 Rewrite (S, New_Copy_Tree (Subtype_Mark (S)));
17843 -- Set Ekind of orphan itype, to prevent cascaded errors
17845 if Present (Def_Id) then
17846 Set_Ekind (Def_Id, Ekind (Any_Type));
17849 -- Make recursive call, having got rid of the bogus constraint
17851 return Process_Subtype (S, Related_Nod, Related_Id, Suffix);
17854 -- Remaining processing depends on type
17856 case Ekind (Subtype_Mark_Id) is
17857 when Access_Kind =>
17858 Constrain_Access (Def_Id, S, Related_Nod);
17861 and then Is_Itype (Designated_Type (Def_Id))
17862 and then Nkind (Related_Nod) = N_Subtype_Declaration
17863 and then not Is_Incomplete_Type (Designated_Type (Def_Id))
17865 Build_Itype_Reference
17866 (Designated_Type (Def_Id), Related_Nod);
17870 Constrain_Array (Def_Id, S, Related_Nod, Related_Id, Suffix);
17872 when Decimal_Fixed_Point_Kind =>
17873 Constrain_Decimal (Def_Id, S);
17875 when Enumeration_Kind =>
17876 Constrain_Enumeration (Def_Id, S);
17878 when Ordinary_Fixed_Point_Kind =>
17879 Constrain_Ordinary_Fixed (Def_Id, S);
17882 Constrain_Float (Def_Id, S);
17884 when Integer_Kind =>
17885 Constrain_Integer (Def_Id, S);
17887 when E_Record_Type |
17890 E_Incomplete_Type =>
17891 Constrain_Discriminated_Type (Def_Id, S, Related_Nod);
17893 if Ekind (Def_Id) = E_Incomplete_Type then
17894 Set_Private_Dependents (Def_Id, New_Elmt_List);
17897 when Private_Kind =>
17898 Constrain_Discriminated_Type (Def_Id, S, Related_Nod);
17899 Set_Private_Dependents (Def_Id, New_Elmt_List);
17901 -- In case of an invalid constraint prevent further processing
17902 -- since the type constructed is missing expected fields.
17904 if Etype (Def_Id) = Any_Type then
17908 -- If the full view is that of a task with discriminants,
17909 -- we must constrain both the concurrent type and its
17910 -- corresponding record type. Otherwise we will just propagate
17911 -- the constraint to the full view, if available.
17913 if Present (Full_View (Subtype_Mark_Id))
17914 and then Has_Discriminants (Subtype_Mark_Id)
17915 and then Is_Concurrent_Type (Full_View (Subtype_Mark_Id))
17918 Create_Itype (E_Void, Related_Nod, Related_Id, Suffix);
17920 Set_Entity (Subtype_Mark (S), Full_View (Subtype_Mark_Id));
17921 Constrain_Concurrent (Full_View_Id, S,
17922 Related_Nod, Related_Id, Suffix);
17923 Set_Entity (Subtype_Mark (S), Subtype_Mark_Id);
17924 Set_Full_View (Def_Id, Full_View_Id);
17926 -- Introduce an explicit reference to the private subtype,
17927 -- to prevent scope anomalies in gigi if first use appears
17928 -- in a nested context, e.g. a later function body.
17929 -- Should this be generated in other contexts than a full
17930 -- type declaration?
17932 if Is_Itype (Def_Id)
17934 Nkind (Parent (P)) = N_Full_Type_Declaration
17936 Build_Itype_Reference (Def_Id, Parent (P));
17940 Prepare_Private_Subtype_Completion (Def_Id, Related_Nod);
17943 when Concurrent_Kind =>
17944 Constrain_Concurrent (Def_Id, S,
17945 Related_Nod, Related_Id, Suffix);
17948 Error_Msg_N ("invalid subtype mark in subtype indication", S);
17951 -- Size and Convention are always inherited from the base type
17953 Set_Size_Info (Def_Id, (Subtype_Mark_Id));
17954 Set_Convention (Def_Id, Convention (Subtype_Mark_Id));
17958 end Process_Subtype;
17960 ---------------------------------------
17961 -- Check_Anonymous_Access_Components --
17962 ---------------------------------------
17964 procedure Check_Anonymous_Access_Components
17965 (Typ_Decl : Node_Id;
17968 Comp_List : Node_Id)
17970 Loc : constant Source_Ptr := Sloc (Typ_Decl);
17971 Anon_Access : Entity_Id;
17974 Comp_Def : Node_Id;
17976 Type_Def : Node_Id;
17978 procedure Build_Incomplete_Type_Declaration;
17979 -- If the record type contains components that include an access to the
17980 -- current record, then create an incomplete type declaration for the
17981 -- record, to be used as the designated type of the anonymous access.
17982 -- This is done only once, and only if there is no previous partial
17983 -- view of the type.
17985 function Designates_T (Subt : Node_Id) return Boolean;
17986 -- Check whether a node designates the enclosing record type, or 'Class
17989 function Mentions_T (Acc_Def : Node_Id) return Boolean;
17990 -- Check whether an access definition includes a reference to
17991 -- the enclosing record type. The reference can be a subtype mark
17992 -- in the access definition itself, a 'Class attribute reference, or
17993 -- recursively a reference appearing in a parameter specification
17994 -- or result definition of an access_to_subprogram definition.
17996 --------------------------------------
17997 -- Build_Incomplete_Type_Declaration --
17998 --------------------------------------
18000 procedure Build_Incomplete_Type_Declaration is
18005 -- Is_Tagged indicates whether the type is tagged. It is tagged if
18006 -- it's "is new ... with record" or else "is tagged record ...".
18008 Is_Tagged : constant Boolean :=
18009 (Nkind (Type_Definition (Typ_Decl)) = N_Derived_Type_Definition
18012 (Record_Extension_Part (Type_Definition (Typ_Decl))))
18014 (Nkind (Type_Definition (Typ_Decl)) = N_Record_Definition
18015 and then Tagged_Present (Type_Definition (Typ_Decl)));
18018 -- If there is a previous partial view, no need to create a new one
18019 -- If the partial view, given by Prev, is incomplete, If Prev is
18020 -- a private declaration, full declaration is flagged accordingly.
18022 if Prev /= Typ then
18024 Make_Class_Wide_Type (Prev);
18025 Set_Class_Wide_Type (Typ, Class_Wide_Type (Prev));
18026 Set_Etype (Class_Wide_Type (Typ), Typ);
18031 elsif Has_Private_Declaration (Typ) then
18033 -- If we refer to T'Class inside T, and T is the completion of a
18034 -- private type, then we need to make sure the class-wide type
18038 Make_Class_Wide_Type (Typ);
18043 -- If there was a previous anonymous access type, the incomplete
18044 -- type declaration will have been created already.
18046 elsif Present (Current_Entity (Typ))
18047 and then Ekind (Current_Entity (Typ)) = E_Incomplete_Type
18048 and then Full_View (Current_Entity (Typ)) = Typ
18051 and then Comes_From_Source (Current_Entity (Typ))
18052 and then not Is_Tagged_Type (Current_Entity (Typ))
18054 Make_Class_Wide_Type (Typ);
18056 ("incomplete view of tagged type should be declared tagged?",
18057 Parent (Current_Entity (Typ)));
18062 Inc_T := Make_Defining_Identifier (Loc, Chars (Typ));
18063 Decl := Make_Incomplete_Type_Declaration (Loc, Inc_T);
18065 -- Type has already been inserted into the current scope. Remove
18066 -- it, and add incomplete declaration for type, so that subsequent
18067 -- anonymous access types can use it. The entity is unchained from
18068 -- the homonym list and from immediate visibility. After analysis,
18069 -- the entity in the incomplete declaration becomes immediately
18070 -- visible in the record declaration that follows.
18072 H := Current_Entity (Typ);
18075 Set_Name_Entity_Id (Chars (Typ), Homonym (Typ));
18078 and then Homonym (H) /= Typ
18080 H := Homonym (Typ);
18083 Set_Homonym (H, Homonym (Typ));
18086 Insert_Before (Typ_Decl, Decl);
18088 Set_Full_View (Inc_T, Typ);
18092 -- Create a common class-wide type for both views, and set the
18093 -- Etype of the class-wide type to the full view.
18095 Make_Class_Wide_Type (Inc_T);
18096 Set_Class_Wide_Type (Typ, Class_Wide_Type (Inc_T));
18097 Set_Etype (Class_Wide_Type (Typ), Typ);
18100 end Build_Incomplete_Type_Declaration;
18106 function Designates_T (Subt : Node_Id) return Boolean is
18107 Type_Id : constant Name_Id := Chars (Typ);
18109 function Names_T (Nam : Node_Id) return Boolean;
18110 -- The record type has not been introduced in the current scope
18111 -- yet, so we must examine the name of the type itself, either
18112 -- an identifier T, or an expanded name of the form P.T, where
18113 -- P denotes the current scope.
18119 function Names_T (Nam : Node_Id) return Boolean is
18121 if Nkind (Nam) = N_Identifier then
18122 return Chars (Nam) = Type_Id;
18124 elsif Nkind (Nam) = N_Selected_Component then
18125 if Chars (Selector_Name (Nam)) = Type_Id then
18126 if Nkind (Prefix (Nam)) = N_Identifier then
18127 return Chars (Prefix (Nam)) = Chars (Current_Scope);
18129 elsif Nkind (Prefix (Nam)) = N_Selected_Component then
18130 return Chars (Selector_Name (Prefix (Nam))) =
18131 Chars (Current_Scope);
18145 -- Start of processing for Designates_T
18148 if Nkind (Subt) = N_Identifier then
18149 return Chars (Subt) = Type_Id;
18151 -- Reference can be through an expanded name which has not been
18152 -- analyzed yet, and which designates enclosing scopes.
18154 elsif Nkind (Subt) = N_Selected_Component then
18155 if Names_T (Subt) then
18158 -- Otherwise it must denote an entity that is already visible.
18159 -- The access definition may name a subtype of the enclosing
18160 -- type, if there is a previous incomplete declaration for it.
18163 Find_Selected_Component (Subt);
18165 Is_Entity_Name (Subt)
18166 and then Scope (Entity (Subt)) = Current_Scope
18168 (Chars (Base_Type (Entity (Subt))) = Type_Id
18170 (Is_Class_Wide_Type (Entity (Subt))
18172 Chars (Etype (Base_Type (Entity (Subt)))) =
18176 -- A reference to the current type may appear as the prefix of
18177 -- a 'Class attribute.
18179 elsif Nkind (Subt) = N_Attribute_Reference
18180 and then Attribute_Name (Subt) = Name_Class
18182 return Names_T (Prefix (Subt));
18193 function Mentions_T (Acc_Def : Node_Id) return Boolean is
18194 Param_Spec : Node_Id;
18196 Acc_Subprg : constant Node_Id :=
18197 Access_To_Subprogram_Definition (Acc_Def);
18200 if No (Acc_Subprg) then
18201 return Designates_T (Subtype_Mark (Acc_Def));
18204 -- Component is an access_to_subprogram: examine its formals,
18205 -- and result definition in the case of an access_to_function.
18207 Param_Spec := First (Parameter_Specifications (Acc_Subprg));
18208 while Present (Param_Spec) loop
18209 if Nkind (Parameter_Type (Param_Spec)) = N_Access_Definition
18210 and then Mentions_T (Parameter_Type (Param_Spec))
18214 elsif Designates_T (Parameter_Type (Param_Spec)) then
18221 if Nkind (Acc_Subprg) = N_Access_Function_Definition then
18222 if Nkind (Result_Definition (Acc_Subprg)) =
18223 N_Access_Definition
18225 return Mentions_T (Result_Definition (Acc_Subprg));
18227 return Designates_T (Result_Definition (Acc_Subprg));
18234 -- Start of processing for Check_Anonymous_Access_Components
18237 if No (Comp_List) then
18241 Comp := First (Component_Items (Comp_List));
18242 while Present (Comp) loop
18243 if Nkind (Comp) = N_Component_Declaration
18245 (Access_Definition (Component_Definition (Comp)))
18247 Mentions_T (Access_Definition (Component_Definition (Comp)))
18249 Comp_Def := Component_Definition (Comp);
18251 Access_To_Subprogram_Definition
18252 (Access_Definition (Comp_Def));
18254 Build_Incomplete_Type_Declaration;
18255 Anon_Access := Make_Temporary (Loc, 'S');
18257 -- Create a declaration for the anonymous access type: either
18258 -- an access_to_object or an access_to_subprogram.
18260 if Present (Acc_Def) then
18261 if Nkind (Acc_Def) = N_Access_Function_Definition then
18263 Make_Access_Function_Definition (Loc,
18264 Parameter_Specifications =>
18265 Parameter_Specifications (Acc_Def),
18266 Result_Definition => Result_Definition (Acc_Def));
18269 Make_Access_Procedure_Definition (Loc,
18270 Parameter_Specifications =>
18271 Parameter_Specifications (Acc_Def));
18276 Make_Access_To_Object_Definition (Loc,
18277 Subtype_Indication =>
18280 (Access_Definition (Comp_Def))));
18282 Set_Constant_Present
18283 (Type_Def, Constant_Present (Access_Definition (Comp_Def)));
18285 (Type_Def, All_Present (Access_Definition (Comp_Def)));
18288 Set_Null_Exclusion_Present
18290 Null_Exclusion_Present (Access_Definition (Comp_Def)));
18293 Make_Full_Type_Declaration (Loc,
18294 Defining_Identifier => Anon_Access,
18295 Type_Definition => Type_Def);
18297 Insert_Before (Typ_Decl, Decl);
18300 -- If an access to object, Preserve entity of designated type,
18301 -- for ASIS use, before rewriting the component definition.
18303 if No (Acc_Def) then
18308 Desig := Entity (Subtype_Indication (Type_Def));
18310 -- If the access definition is to the current record,
18311 -- the visible entity at this point is an incomplete
18312 -- type. Retrieve the full view to simplify ASIS queries
18314 if Ekind (Desig) = E_Incomplete_Type then
18315 Desig := Full_View (Desig);
18319 (Subtype_Mark (Access_Definition (Comp_Def)), Desig);
18324 Make_Component_Definition (Loc,
18325 Subtype_Indication =>
18326 New_Occurrence_Of (Anon_Access, Loc)));
18328 if Ekind (Designated_Type (Anon_Access)) = E_Subprogram_Type then
18329 Set_Ekind (Anon_Access, E_Anonymous_Access_Subprogram_Type);
18331 Set_Ekind (Anon_Access, E_Anonymous_Access_Type);
18334 Set_Is_Local_Anonymous_Access (Anon_Access);
18340 if Present (Variant_Part (Comp_List)) then
18344 V := First_Non_Pragma (Variants (Variant_Part (Comp_List)));
18345 while Present (V) loop
18346 Check_Anonymous_Access_Components
18347 (Typ_Decl, Typ, Prev, Component_List (V));
18348 Next_Non_Pragma (V);
18352 end Check_Anonymous_Access_Components;
18354 --------------------------------
18355 -- Preanalyze_Spec_Expression --
18356 --------------------------------
18358 procedure Preanalyze_Spec_Expression (N : Node_Id; T : Entity_Id) is
18359 Save_In_Spec_Expression : constant Boolean := In_Spec_Expression;
18361 In_Spec_Expression := True;
18362 Preanalyze_And_Resolve (N, T);
18363 In_Spec_Expression := Save_In_Spec_Expression;
18364 end Preanalyze_Spec_Expression;
18366 -----------------------------
18367 -- Record_Type_Declaration --
18368 -----------------------------
18370 procedure Record_Type_Declaration
18375 Def : constant Node_Id := Type_Definition (N);
18376 Is_Tagged : Boolean;
18377 Tag_Comp : Entity_Id;
18380 -- These flags must be initialized before calling Process_Discriminants
18381 -- because this routine makes use of them.
18383 Set_Ekind (T, E_Record_Type);
18385 Init_Size_Align (T);
18386 Set_Interfaces (T, No_Elist);
18387 Set_Stored_Constraint (T, No_Elist);
18391 if Ada_Version < Ada_2005
18392 or else not Interface_Present (Def)
18394 -- The flag Is_Tagged_Type might have already been set by
18395 -- Find_Type_Name if it detected an error for declaration T. This
18396 -- arises in the case of private tagged types where the full view
18397 -- omits the word tagged.
18400 Tagged_Present (Def)
18401 or else (Serious_Errors_Detected > 0 and then Is_Tagged_Type (T));
18403 Set_Is_Tagged_Type (T, Is_Tagged);
18404 Set_Is_Limited_Record (T, Limited_Present (Def));
18406 -- Type is abstract if full declaration carries keyword, or if
18407 -- previous partial view did.
18409 Set_Is_Abstract_Type (T, Is_Abstract_Type (T)
18410 or else Abstract_Present (Def));
18414 Analyze_Interface_Declaration (T, Def);
18416 if Present (Discriminant_Specifications (N)) then
18418 ("interface types cannot have discriminants",
18419 Defining_Identifier
18420 (First (Discriminant_Specifications (N))));
18424 -- First pass: if there are self-referential access components,
18425 -- create the required anonymous access type declarations, and if
18426 -- need be an incomplete type declaration for T itself.
18428 Check_Anonymous_Access_Components (N, T, Prev, Component_List (Def));
18430 if Ada_Version >= Ada_2005
18431 and then Present (Interface_List (Def))
18433 Check_Interfaces (N, Def);
18436 Ifaces_List : Elist_Id;
18439 -- Ada 2005 (AI-251): Collect the list of progenitors that are not
18440 -- already in the parents.
18444 Ifaces_List => Ifaces_List,
18445 Exclude_Parents => True);
18447 Set_Interfaces (T, Ifaces_List);
18451 -- Records constitute a scope for the component declarations within.
18452 -- The scope is created prior to the processing of these declarations.
18453 -- Discriminants are processed first, so that they are visible when
18454 -- processing the other components. The Ekind of the record type itself
18455 -- is set to E_Record_Type (subtypes appear as E_Record_Subtype).
18457 -- Enter record scope
18461 -- If an incomplete or private type declaration was already given for
18462 -- the type, then this scope already exists, and the discriminants have
18463 -- been declared within. We must verify that the full declaration
18464 -- matches the incomplete one.
18466 Check_Or_Process_Discriminants (N, T, Prev);
18468 Set_Is_Constrained (T, not Has_Discriminants (T));
18469 Set_Has_Delayed_Freeze (T, True);
18471 -- For tagged types add a manually analyzed component corresponding
18472 -- to the component _tag, the corresponding piece of tree will be
18473 -- expanded as part of the freezing actions if it is not a CPP_Class.
18477 -- Do not add the tag unless we are in expansion mode
18479 if Expander_Active then
18480 Tag_Comp := Make_Defining_Identifier (Sloc (Def), Name_uTag);
18481 Enter_Name (Tag_Comp);
18483 Set_Ekind (Tag_Comp, E_Component);
18484 Set_Is_Tag (Tag_Comp);
18485 Set_Is_Aliased (Tag_Comp);
18486 Set_Etype (Tag_Comp, RTE (RE_Tag));
18487 Set_DT_Entry_Count (Tag_Comp, No_Uint);
18488 Set_Original_Record_Component (Tag_Comp, Tag_Comp);
18489 Init_Component_Location (Tag_Comp);
18491 -- Ada 2005 (AI-251): Addition of the Tag corresponding to all the
18492 -- implemented interfaces.
18494 if Has_Interfaces (T) then
18495 Add_Interface_Tag_Components (N, T);
18499 Make_Class_Wide_Type (T);
18500 Set_Direct_Primitive_Operations (T, New_Elmt_List);
18503 -- We must suppress range checks when processing record components in
18504 -- the presence of discriminants, since we don't want spurious checks to
18505 -- be generated during their analysis, but Suppress_Range_Checks flags
18506 -- must be reset the after processing the record definition.
18508 -- Note: this is the only use of Kill_Range_Checks, and is a bit odd,
18509 -- couldn't we just use the normal range check suppression method here.
18510 -- That would seem cleaner ???
18512 if Has_Discriminants (T) and then not Range_Checks_Suppressed (T) then
18513 Set_Kill_Range_Checks (T, True);
18514 Record_Type_Definition (Def, Prev);
18515 Set_Kill_Range_Checks (T, False);
18517 Record_Type_Definition (Def, Prev);
18520 -- Exit from record scope
18524 -- Ada 2005 (AI-251 and AI-345): Derive the interface subprograms of all
18525 -- the implemented interfaces and associate them an aliased entity.
18528 and then not Is_Empty_List (Interface_List (Def))
18530 Derive_Progenitor_Subprograms (T, T);
18532 end Record_Type_Declaration;
18534 ----------------------------
18535 -- Record_Type_Definition --
18536 ----------------------------
18538 procedure Record_Type_Definition (Def : Node_Id; Prev_T : Entity_Id) is
18539 Component : Entity_Id;
18540 Ctrl_Components : Boolean := False;
18541 Final_Storage_Only : Boolean;
18545 if Ekind (Prev_T) = E_Incomplete_Type then
18546 T := Full_View (Prev_T);
18551 Final_Storage_Only := not Is_Controlled (T);
18553 -- Ada 2005: check whether an explicit Limited is present in a derived
18554 -- type declaration.
18556 if Nkind (Parent (Def)) = N_Derived_Type_Definition
18557 and then Limited_Present (Parent (Def))
18559 Set_Is_Limited_Record (T);
18562 -- If the component list of a record type is defined by the reserved
18563 -- word null and there is no discriminant part, then the record type has
18564 -- no components and all records of the type are null records (RM 3.7)
18565 -- This procedure is also called to process the extension part of a
18566 -- record extension, in which case the current scope may have inherited
18570 or else No (Component_List (Def))
18571 or else Null_Present (Component_List (Def))
18576 Analyze_Declarations (Component_Items (Component_List (Def)));
18578 if Present (Variant_Part (Component_List (Def))) then
18579 Analyze (Variant_Part (Component_List (Def)));
18583 -- After completing the semantic analysis of the record definition,
18584 -- record components, both new and inherited, are accessible. Set their
18585 -- kind accordingly. Exclude malformed itypes from illegal declarations,
18586 -- whose Ekind may be void.
18588 Component := First_Entity (Current_Scope);
18589 while Present (Component) loop
18590 if Ekind (Component) = E_Void
18591 and then not Is_Itype (Component)
18593 Set_Ekind (Component, E_Component);
18594 Init_Component_Location (Component);
18597 if Has_Task (Etype (Component)) then
18601 if Ekind (Component) /= E_Component then
18604 -- Do not set Has_Controlled_Component on a class-wide equivalent
18605 -- type. See Make_CW_Equivalent_Type.
18607 elsif not Is_Class_Wide_Equivalent_Type (T)
18608 and then (Has_Controlled_Component (Etype (Component))
18609 or else (Chars (Component) /= Name_uParent
18610 and then Is_Controlled (Etype (Component))))
18612 Set_Has_Controlled_Component (T, True);
18613 Final_Storage_Only :=
18615 and then Finalize_Storage_Only (Etype (Component));
18616 Ctrl_Components := True;
18619 Next_Entity (Component);
18622 -- A Type is Finalize_Storage_Only only if all its controlled components
18625 if Ctrl_Components then
18626 Set_Finalize_Storage_Only (T, Final_Storage_Only);
18629 -- Place reference to end record on the proper entity, which may
18630 -- be a partial view.
18632 if Present (Def) then
18633 Process_End_Label (Def, 'e', Prev_T);
18635 end Record_Type_Definition;
18637 ------------------------
18638 -- Replace_Components --
18639 ------------------------
18641 procedure Replace_Components (Typ : Entity_Id; Decl : Node_Id) is
18642 function Process (N : Node_Id) return Traverse_Result;
18648 function Process (N : Node_Id) return Traverse_Result is
18652 if Nkind (N) = N_Discriminant_Specification then
18653 Comp := First_Discriminant (Typ);
18654 while Present (Comp) loop
18655 if Chars (Comp) = Chars (Defining_Identifier (N)) then
18656 Set_Defining_Identifier (N, Comp);
18660 Next_Discriminant (Comp);
18663 elsif Nkind (N) = N_Component_Declaration then
18664 Comp := First_Component (Typ);
18665 while Present (Comp) loop
18666 if Chars (Comp) = Chars (Defining_Identifier (N)) then
18667 Set_Defining_Identifier (N, Comp);
18671 Next_Component (Comp);
18678 procedure Replace is new Traverse_Proc (Process);
18680 -- Start of processing for Replace_Components
18684 end Replace_Components;
18686 -------------------------------
18687 -- Set_Completion_Referenced --
18688 -------------------------------
18690 procedure Set_Completion_Referenced (E : Entity_Id) is
18692 -- If in main unit, mark entity that is a completion as referenced,
18693 -- warnings go on the partial view when needed.
18695 if In_Extended_Main_Source_Unit (E) then
18696 Set_Referenced (E);
18698 end Set_Completion_Referenced;
18700 ---------------------
18701 -- Set_Fixed_Range --
18702 ---------------------
18704 -- The range for fixed-point types is complicated by the fact that we
18705 -- do not know the exact end points at the time of the declaration. This
18706 -- is true for three reasons:
18708 -- A size clause may affect the fudging of the end-points
18709 -- A small clause may affect the values of the end-points
18710 -- We try to include the end-points if it does not affect the size
18712 -- This means that the actual end-points must be established at the point
18713 -- when the type is frozen. Meanwhile, we first narrow the range as
18714 -- permitted (so that it will fit if necessary in a small specified size),
18715 -- and then build a range subtree with these narrowed bounds.
18717 -- Set_Fixed_Range constructs the range from real literal values, and sets
18718 -- the range as the Scalar_Range of the given fixed-point type entity.
18720 -- The parent of this range is set to point to the entity so that it is
18721 -- properly hooked into the tree (unlike normal Scalar_Range entries for
18722 -- other scalar types, which are just pointers to the range in the
18723 -- original tree, this would otherwise be an orphan).
18725 -- The tree is left unanalyzed. When the type is frozen, the processing
18726 -- in Freeze.Freeze_Fixed_Point_Type notices that the range is not
18727 -- analyzed, and uses this as an indication that it should complete
18728 -- work on the range (it will know the final small and size values).
18730 procedure Set_Fixed_Range
18736 S : constant Node_Id :=
18738 Low_Bound => Make_Real_Literal (Loc, Lo),
18739 High_Bound => Make_Real_Literal (Loc, Hi));
18741 Set_Scalar_Range (E, S);
18743 end Set_Fixed_Range;
18745 ----------------------------------
18746 -- Set_Scalar_Range_For_Subtype --
18747 ----------------------------------
18749 procedure Set_Scalar_Range_For_Subtype
18750 (Def_Id : Entity_Id;
18754 Kind : constant Entity_Kind := Ekind (Def_Id);
18757 -- Defend against previous error
18759 if Nkind (R) = N_Error then
18763 Set_Scalar_Range (Def_Id, R);
18765 -- We need to link the range into the tree before resolving it so
18766 -- that types that are referenced, including importantly the subtype
18767 -- itself, are properly frozen (Freeze_Expression requires that the
18768 -- expression be properly linked into the tree). Of course if it is
18769 -- already linked in, then we do not disturb the current link.
18771 if No (Parent (R)) then
18772 Set_Parent (R, Def_Id);
18775 -- Reset the kind of the subtype during analysis of the range, to
18776 -- catch possible premature use in the bounds themselves.
18778 Set_Ekind (Def_Id, E_Void);
18779 Process_Range_Expr_In_Decl (R, Subt);
18780 Set_Ekind (Def_Id, Kind);
18781 end Set_Scalar_Range_For_Subtype;
18783 --------------------------------------------------------
18784 -- Set_Stored_Constraint_From_Discriminant_Constraint --
18785 --------------------------------------------------------
18787 procedure Set_Stored_Constraint_From_Discriminant_Constraint
18791 -- Make sure set if encountered during Expand_To_Stored_Constraint
18793 Set_Stored_Constraint (E, No_Elist);
18795 -- Give it the right value
18797 if Is_Constrained (E) and then Has_Discriminants (E) then
18798 Set_Stored_Constraint (E,
18799 Expand_To_Stored_Constraint (E, Discriminant_Constraint (E)));
18801 end Set_Stored_Constraint_From_Discriminant_Constraint;
18803 -------------------------------------
18804 -- Signed_Integer_Type_Declaration --
18805 -------------------------------------
18807 procedure Signed_Integer_Type_Declaration (T : Entity_Id; Def : Node_Id) is
18808 Implicit_Base : Entity_Id;
18809 Base_Typ : Entity_Id;
18812 Errs : Boolean := False;
18816 function Can_Derive_From (E : Entity_Id) return Boolean;
18817 -- Determine whether given bounds allow derivation from specified type
18819 procedure Check_Bound (Expr : Node_Id);
18820 -- Check bound to make sure it is integral and static. If not, post
18821 -- appropriate error message and set Errs flag
18823 ---------------------
18824 -- Can_Derive_From --
18825 ---------------------
18827 -- Note we check both bounds against both end values, to deal with
18828 -- strange types like ones with a range of 0 .. -12341234.
18830 function Can_Derive_From (E : Entity_Id) return Boolean is
18831 Lo : constant Uint := Expr_Value (Type_Low_Bound (E));
18832 Hi : constant Uint := Expr_Value (Type_High_Bound (E));
18834 return Lo <= Lo_Val and then Lo_Val <= Hi
18836 Lo <= Hi_Val and then Hi_Val <= Hi;
18837 end Can_Derive_From;
18843 procedure Check_Bound (Expr : Node_Id) is
18845 -- If a range constraint is used as an integer type definition, each
18846 -- bound of the range must be defined by a static expression of some
18847 -- integer type, but the two bounds need not have the same integer
18848 -- type (Negative bounds are allowed.) (RM 3.5.4)
18850 if not Is_Integer_Type (Etype (Expr)) then
18852 ("integer type definition bounds must be of integer type", Expr);
18855 elsif not Is_OK_Static_Expression (Expr) then
18856 Flag_Non_Static_Expr
18857 ("non-static expression used for integer type bound!", Expr);
18860 -- The bounds are folded into literals, and we set their type to be
18861 -- universal, to avoid typing difficulties: we cannot set the type
18862 -- of the literal to the new type, because this would be a forward
18863 -- reference for the back end, and if the original type is user-
18864 -- defined this can lead to spurious semantic errors (e.g. 2928-003).
18867 if Is_Entity_Name (Expr) then
18868 Fold_Uint (Expr, Expr_Value (Expr), True);
18871 Set_Etype (Expr, Universal_Integer);
18875 -- Start of processing for Signed_Integer_Type_Declaration
18878 -- Create an anonymous base type
18881 Create_Itype (E_Signed_Integer_Type, Parent (Def), T, 'B');
18883 -- Analyze and check the bounds, they can be of any integer type
18885 Lo := Low_Bound (Def);
18886 Hi := High_Bound (Def);
18888 -- Arbitrarily use Integer as the type if either bound had an error
18890 if Hi = Error or else Lo = Error then
18891 Base_Typ := Any_Integer;
18892 Set_Error_Posted (T, True);
18894 -- Here both bounds are OK expressions
18897 Analyze_And_Resolve (Lo, Any_Integer);
18898 Analyze_And_Resolve (Hi, Any_Integer);
18904 Hi := Type_High_Bound (Standard_Long_Long_Integer);
18905 Lo := Type_Low_Bound (Standard_Long_Long_Integer);
18908 -- Find type to derive from
18910 Lo_Val := Expr_Value (Lo);
18911 Hi_Val := Expr_Value (Hi);
18913 if Can_Derive_From (Standard_Short_Short_Integer) then
18914 Base_Typ := Base_Type (Standard_Short_Short_Integer);
18916 elsif Can_Derive_From (Standard_Short_Integer) then
18917 Base_Typ := Base_Type (Standard_Short_Integer);
18919 elsif Can_Derive_From (Standard_Integer) then
18920 Base_Typ := Base_Type (Standard_Integer);
18922 elsif Can_Derive_From (Standard_Long_Integer) then
18923 Base_Typ := Base_Type (Standard_Long_Integer);
18925 elsif Can_Derive_From (Standard_Long_Long_Integer) then
18926 Base_Typ := Base_Type (Standard_Long_Long_Integer);
18929 Base_Typ := Base_Type (Standard_Long_Long_Integer);
18930 Error_Msg_N ("integer type definition bounds out of range", Def);
18931 Hi := Type_High_Bound (Standard_Long_Long_Integer);
18932 Lo := Type_Low_Bound (Standard_Long_Long_Integer);
18936 -- Complete both implicit base and declared first subtype entities
18938 Set_Etype (Implicit_Base, Base_Typ);
18939 Set_Scalar_Range (Implicit_Base, Scalar_Range (Base_Typ));
18940 Set_Size_Info (Implicit_Base, (Base_Typ));
18941 Set_RM_Size (Implicit_Base, RM_Size (Base_Typ));
18942 Set_First_Rep_Item (Implicit_Base, First_Rep_Item (Base_Typ));
18944 Set_Ekind (T, E_Signed_Integer_Subtype);
18945 Set_Etype (T, Implicit_Base);
18947 Set_Size_Info (T, (Implicit_Base));
18948 Set_First_Rep_Item (T, First_Rep_Item (Implicit_Base));
18949 Set_Scalar_Range (T, Def);
18950 Set_RM_Size (T, UI_From_Int (Minimum_Size (T)));
18951 Set_Is_Constrained (T);
18952 end Signed_Integer_Type_Declaration;