1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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 Atree; use Atree;
27 with Checks; use Checks;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Aggr; use Exp_Aggr;
31 with Exp_Atag; use Exp_Atag;
32 with Exp_Ch4; use Exp_Ch4;
33 with Exp_Ch6; use Exp_Ch6;
34 with Exp_Ch7; use Exp_Ch7;
35 with Exp_Ch9; use Exp_Ch9;
36 with Exp_Ch11; use Exp_Ch11;
37 with Exp_Disp; use Exp_Disp;
38 with Exp_Dist; use Exp_Dist;
39 with Exp_Smem; use Exp_Smem;
40 with Exp_Strm; use Exp_Strm;
41 with Exp_Tss; use Exp_Tss;
42 with Exp_Util; use Exp_Util;
43 with Freeze; use Freeze;
44 with Nlists; use Nlists;
45 with Namet; use Namet;
46 with Nmake; use Nmake;
48 with Restrict; use Restrict;
49 with Rident; use Rident;
50 with Rtsfind; use Rtsfind;
52 with Sem_Aux; use Sem_Aux;
53 with Sem_Attr; use Sem_Attr;
54 with Sem_Cat; use Sem_Cat;
55 with Sem_Ch3; use Sem_Ch3;
56 with Sem_Ch6; use Sem_Ch6;
57 with Sem_Ch8; use Sem_Ch8;
58 with Sem_Disp; use Sem_Disp;
59 with Sem_Eval; use Sem_Eval;
60 with Sem_Mech; use Sem_Mech;
61 with Sem_Res; use Sem_Res;
62 with Sem_SCIL; use Sem_SCIL;
63 with Sem_Type; use Sem_Type;
64 with Sem_Util; use Sem_Util;
65 with Sinfo; use Sinfo;
66 with Stand; use Stand;
67 with Snames; use Snames;
68 with Targparm; use Targparm;
69 with Tbuild; use Tbuild;
70 with Ttypes; use Ttypes;
71 with Validsw; use Validsw;
73 package body Exp_Ch3 is
75 -----------------------
76 -- Local Subprograms --
77 -----------------------
79 function Add_Final_Chain (Def_Id : Entity_Id) return Entity_Id;
80 -- Add the declaration of a finalization list to the freeze actions for
81 -- Def_Id, and return its defining identifier.
83 procedure Adjust_Discriminants (Rtype : Entity_Id);
84 -- This is used when freezing a record type. It attempts to construct
85 -- more restrictive subtypes for discriminants so that the max size of
86 -- the record can be calculated more accurately. See the body of this
87 -- procedure for details.
89 procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id);
90 -- Build initialization procedure for given array type. Nod is a node
91 -- used for attachment of any actions required in its construction.
92 -- It also supplies the source location used for the procedure.
94 function Build_Discriminant_Formals
96 Use_Dl : Boolean) return List_Id;
97 -- This function uses the discriminants of a type to build a list of
98 -- formal parameters, used in Build_Init_Procedure among other places.
99 -- If the flag Use_Dl is set, the list is built using the already
100 -- defined discriminals of the type, as is the case for concurrent
101 -- types with discriminants. Otherwise new identifiers are created,
102 -- with the source names of the discriminants.
104 function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id;
105 -- This function builds a static aggregate that can serve as the initial
106 -- value for an array type whose bounds are static, and whose component
107 -- type is a composite type that has a static equivalent aggregate.
108 -- The equivalent array aggregate is used both for object initialization
109 -- and for component initialization, when used in the following function.
111 function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id;
112 -- This function builds a static aggregate that can serve as the initial
113 -- value for a record type whose components are scalar and initialized
114 -- with compile-time values, or arrays with similar initialization or
115 -- defaults. When possible, initialization of an object of the type can
116 -- be achieved by using a copy of the aggregate as an initial value, thus
117 -- removing the implicit call that would otherwise constitute elaboration
120 function Build_Master_Renaming
122 T : Entity_Id) return Entity_Id;
123 -- If the designated type of an access type is a task type or contains
124 -- tasks, we make sure that a _Master variable is declared in the current
125 -- scope, and then declare a renaming for it:
127 -- atypeM : Master_Id renames _Master;
129 -- where atyp is the name of the access type. This declaration is used when
130 -- an allocator for the access type is expanded. The node is the full
131 -- declaration of the designated type that contains tasks. The renaming
132 -- declaration is inserted before N, and after the Master declaration.
134 procedure Build_Record_Init_Proc (N : Node_Id; Pe : Entity_Id);
135 -- Build record initialization procedure. N is the type declaration
136 -- node, and Pe is the corresponding entity for the record type.
138 procedure Build_Slice_Assignment (Typ : Entity_Id);
139 -- Build assignment procedure for one-dimensional arrays of controlled
140 -- types. Other array and slice assignments are expanded in-line, but
141 -- the code expansion for controlled components (when control actions
142 -- are active) can lead to very large blocks that GCC3 handles poorly.
144 procedure Build_Variant_Record_Equality (Typ : Entity_Id);
145 -- Create An Equality function for the non-tagged variant record 'Typ'
146 -- and attach it to the TSS list
148 procedure Check_Stream_Attributes (Typ : Entity_Id);
149 -- Check that if a limited extension has a parent with user-defined stream
150 -- attributes, and does not itself have user-defined stream-attributes,
151 -- then any limited component of the extension also has the corresponding
152 -- user-defined stream attributes.
154 procedure Clean_Task_Names
156 Proc_Id : Entity_Id);
157 -- If an initialization procedure includes calls to generate names
158 -- for task subcomponents, indicate that secondary stack cleanup is
159 -- needed after an initialization. Typ is the component type, and Proc_Id
160 -- the initialization procedure for the enclosing composite type.
162 procedure Expand_Tagged_Root (T : Entity_Id);
163 -- Add a field _Tag at the beginning of the record. This field carries
164 -- the value of the access to the Dispatch table. This procedure is only
165 -- called on root type, the _Tag field being inherited by the descendants.
167 procedure Expand_Record_Controller (T : Entity_Id);
168 -- T must be a record type that Has_Controlled_Component. Add a field
169 -- _controller of type Record_Controller or Limited_Record_Controller
172 procedure Expand_Freeze_Array_Type (N : Node_Id);
173 -- Freeze an array type. Deals with building the initialization procedure,
174 -- creating the packed array type for a packed array and also with the
175 -- creation of the controlling procedures for the controlled case. The
176 -- argument N is the N_Freeze_Entity node for the type.
178 procedure Expand_Freeze_Enumeration_Type (N : Node_Id);
179 -- Freeze enumeration type with non-standard representation. Builds the
180 -- array and function needed to convert between enumeration pos and
181 -- enumeration representation values. N is the N_Freeze_Entity node
184 procedure Expand_Freeze_Record_Type (N : Node_Id);
185 -- Freeze record type. Builds all necessary discriminant checking
186 -- and other ancillary functions, and builds dispatch tables where
187 -- needed. The argument N is the N_Freeze_Entity node. This processing
188 -- applies only to E_Record_Type entities, not to class wide types,
189 -- record subtypes, or private types.
191 procedure Freeze_Stream_Operations (N : Node_Id; Typ : Entity_Id);
192 -- Treat user-defined stream operations as renaming_as_body if the
193 -- subprogram they rename is not frozen when the type is frozen.
195 procedure Initialization_Warning (E : Entity_Id);
196 -- If static elaboration of the package is requested, indicate
197 -- when a type does meet the conditions for static initialization. If
198 -- E is a type, it has components that have no static initialization.
199 -- if E is an entity, its initial expression is not compile-time known.
201 function Init_Formals (Typ : Entity_Id) return List_Id;
202 -- This function builds the list of formals for an initialization routine.
203 -- The first formal is always _Init with the given type. For task value
204 -- record types and types containing tasks, three additional formals are
207 -- _Master : Master_Id
208 -- _Chain : in out Activation_Chain
209 -- _Task_Name : String
211 -- The caller must append additional entries for discriminants if required.
213 function In_Runtime (E : Entity_Id) return Boolean;
214 -- Check if E is defined in the RTL (in a child of Ada or System). Used
215 -- to avoid to bring in the overhead of _Input, _Output for tagged types.
217 function Is_Variable_Size_Record (E : Entity_Id) return Boolean;
218 -- Returns true if E has variable size components
220 function Make_Eq_Case
223 Discr : Entity_Id := Empty) return List_Id;
224 -- Building block for variant record equality. Defined to share the code
225 -- between the tagged and non-tagged case. Given a Component_List node CL,
226 -- it generates an 'if' followed by a 'case' statement that compares all
227 -- components of local temporaries named X and Y (that are declared as
228 -- formals at some upper level). E provides the Sloc to be used for the
229 -- generated code. Discr is used as the case statement switch in the case
230 -- of Unchecked_Union equality.
234 L : List_Id) return Node_Id;
235 -- Building block for variant record equality. Defined to share the code
236 -- between the tagged and non-tagged case. Given the list of components
237 -- (or discriminants) L, it generates a return statement that compares all
238 -- components of local temporaries named X and Y (that are declared as
239 -- formals at some upper level). E provides the Sloc to be used for the
242 procedure Make_Predefined_Primitive_Specs
243 (Tag_Typ : Entity_Id;
244 Predef_List : out List_Id;
245 Renamed_Eq : out Entity_Id);
246 -- Create a list with the specs of the predefined primitive operations.
247 -- For tagged types that are interfaces all these primitives are defined
250 -- The following entries are present for all tagged types, and provide
251 -- the results of the corresponding attribute applied to the object.
252 -- Dispatching is required in general, since the result of the attribute
253 -- will vary with the actual object subtype.
255 -- _alignment provides result of 'Alignment attribute
256 -- _size provides result of 'Size attribute
257 -- typSR provides result of 'Read attribute
258 -- typSW provides result of 'Write attribute
259 -- typSI provides result of 'Input attribute
260 -- typSO provides result of 'Output attribute
262 -- The following entries are additionally present for non-limited tagged
263 -- types, and implement additional dispatching operations for predefined
266 -- _equality implements "=" operator
267 -- _assign implements assignment operation
268 -- typDF implements deep finalization
269 -- typDA implements deep adjust
271 -- The latter two are empty procedures unless the type contains some
272 -- controlled components that require finalization actions (the deep
273 -- in the name refers to the fact that the action applies to components).
275 -- The list is returned in Predef_List. The Parameter Renamed_Eq either
276 -- returns the value Empty, or else the defining unit name for the
277 -- predefined equality function in the case where the type has a primitive
278 -- operation that is a renaming of predefined equality (but only if there
279 -- is also an overriding user-defined equality function). The returned
280 -- Renamed_Eq will be passed to the corresponding parameter of
281 -- Predefined_Primitive_Bodies.
283 function Has_New_Non_Standard_Rep (T : Entity_Id) return Boolean;
284 -- returns True if there are representation clauses for type T that are not
285 -- inherited. If the result is false, the init_proc and the discriminant
286 -- checking functions of the parent can be reused by a derived type.
288 procedure Make_Controlling_Function_Wrappers
289 (Tag_Typ : Entity_Id;
290 Decl_List : out List_Id;
291 Body_List : out List_Id);
292 -- Ada 2005 (AI-391): Makes specs and bodies for the wrapper functions
293 -- associated with inherited functions with controlling results which
294 -- are not overridden. The body of each wrapper function consists solely
295 -- of a return statement whose expression is an extension aggregate
296 -- invoking the inherited subprogram's parent subprogram and extended
297 -- with a null association list.
299 procedure Make_Null_Procedure_Specs
300 (Tag_Typ : Entity_Id;
301 Decl_List : out List_Id);
302 -- Ada 2005 (AI-251): Makes specs for null procedures associated with any
303 -- null procedures inherited from an interface type that have not been
304 -- overridden. Only one null procedure will be created for a given set of
305 -- inherited null procedures with homographic profiles.
307 function Predef_Spec_Or_Body
312 Ret_Type : Entity_Id := Empty;
313 For_Body : Boolean := False) return Node_Id;
314 -- This function generates the appropriate expansion for a predefined
315 -- primitive operation specified by its name, parameter profile and
316 -- return type (Empty means this is a procedure). If For_Body is false,
317 -- then the returned node is a subprogram declaration. If For_Body is
318 -- true, then the returned node is a empty subprogram body containing
319 -- no declarations and no statements.
321 function Predef_Stream_Attr_Spec
324 Name : TSS_Name_Type;
325 For_Body : Boolean := False) return Node_Id;
326 -- Specialized version of Predef_Spec_Or_Body that apply to read, write,
327 -- input and output attribute whose specs are constructed in Exp_Strm.
329 function Predef_Deep_Spec
332 Name : TSS_Name_Type;
333 For_Body : Boolean := False) return Node_Id;
334 -- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
335 -- and _deep_finalize
337 function Predefined_Primitive_Bodies
338 (Tag_Typ : Entity_Id;
339 Renamed_Eq : Entity_Id) return List_Id;
340 -- Create the bodies of the predefined primitives that are described in
341 -- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
342 -- the defining unit name of the type's predefined equality as returned
343 -- by Make_Predefined_Primitive_Specs.
345 function Predefined_Primitive_Freeze (Tag_Typ : Entity_Id) return List_Id;
346 -- Freeze entities of all predefined primitive operations. This is needed
347 -- because the bodies of these operations do not normally do any freezing.
349 function Stream_Operation_OK
351 Operation : TSS_Name_Type) return Boolean;
352 -- Check whether the named stream operation must be emitted for a given
353 -- type. The rules for inheritance of stream attributes by type extensions
354 -- are enforced by this function. Furthermore, various restrictions prevent
355 -- the generation of these operations, as a useful optimization or for
356 -- certification purposes.
358 ---------------------
359 -- Add_Final_Chain --
360 ---------------------
362 function Add_Final_Chain (Def_Id : Entity_Id) return Entity_Id is
363 Loc : constant Source_Ptr := Sloc (Def_Id);
368 Make_Defining_Identifier (Loc,
369 New_External_Name (Chars (Def_Id), 'L'));
371 Append_Freeze_Action (Def_Id,
372 Make_Object_Declaration (Loc,
373 Defining_Identifier => Flist,
375 New_Reference_To (RTE (RE_List_Controller), Loc)));
380 --------------------------
381 -- Adjust_Discriminants --
382 --------------------------
384 -- This procedure attempts to define subtypes for discriminants that are
385 -- more restrictive than those declared. Such a replacement is possible if
386 -- we can demonstrate that values outside the restricted range would cause
387 -- constraint errors in any case. The advantage of restricting the
388 -- discriminant types in this way is that the maximum size of the variant
389 -- record can be calculated more conservatively.
391 -- An example of a situation in which we can perform this type of
392 -- restriction is the following:
394 -- subtype B is range 1 .. 10;
395 -- type Q is array (B range <>) of Integer;
397 -- type V (N : Natural) is record
401 -- In this situation, we can restrict the upper bound of N to 10, since
402 -- any larger value would cause a constraint error in any case.
404 -- There are many situations in which such restriction is possible, but
405 -- for now, we just look for cases like the above, where the component
406 -- in question is a one dimensional array whose upper bound is one of
407 -- the record discriminants. Also the component must not be part of
408 -- any variant part, since then the component does not always exist.
410 procedure Adjust_Discriminants (Rtype : Entity_Id) is
411 Loc : constant Source_Ptr := Sloc (Rtype);
428 Comp := First_Component (Rtype);
429 while Present (Comp) loop
431 -- If our parent is a variant, quit, we do not look at components
432 -- that are in variant parts, because they may not always exist.
434 P := Parent (Comp); -- component declaration
435 P := Parent (P); -- component list
437 exit when Nkind (Parent (P)) = N_Variant;
439 -- We are looking for a one dimensional array type
441 Ctyp := Etype (Comp);
443 if not Is_Array_Type (Ctyp)
444 or else Number_Dimensions (Ctyp) > 1
449 -- The lower bound must be constant, and the upper bound is a
450 -- discriminant (which is a discriminant of the current record).
452 Ityp := Etype (First_Index (Ctyp));
453 Lo := Type_Low_Bound (Ityp);
454 Hi := Type_High_Bound (Ityp);
456 if not Compile_Time_Known_Value (Lo)
457 or else Nkind (Hi) /= N_Identifier
458 or else No (Entity (Hi))
459 or else Ekind (Entity (Hi)) /= E_Discriminant
464 -- We have an array with appropriate bounds
466 Loval := Expr_Value (Lo);
467 Discr := Entity (Hi);
468 Dtyp := Etype (Discr);
470 -- See if the discriminant has a known upper bound
472 Dhi := Type_High_Bound (Dtyp);
474 if not Compile_Time_Known_Value (Dhi) then
478 Dhiv := Expr_Value (Dhi);
480 -- See if base type of component array has known upper bound
482 Ahi := Type_High_Bound (Etype (First_Index (Base_Type (Ctyp))));
484 if not Compile_Time_Known_Value (Ahi) then
488 Ahiv := Expr_Value (Ahi);
490 -- The condition for doing the restriction is that the high bound
491 -- of the discriminant is greater than the low bound of the array,
492 -- and is also greater than the high bound of the base type index.
494 if Dhiv > Loval and then Dhiv > Ahiv then
496 -- We can reset the upper bound of the discriminant type to
497 -- whichever is larger, the low bound of the component, or
498 -- the high bound of the base type array index.
500 -- We build a subtype that is declared as
502 -- subtype Tnn is discr_type range discr_type'First .. max;
504 -- And insert this declaration into the tree. The type of the
505 -- discriminant is then reset to this more restricted subtype.
507 Tnn := Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
509 Insert_Action (Declaration_Node (Rtype),
510 Make_Subtype_Declaration (Loc,
511 Defining_Identifier => Tnn,
512 Subtype_Indication =>
513 Make_Subtype_Indication (Loc,
514 Subtype_Mark => New_Occurrence_Of (Dtyp, Loc),
516 Make_Range_Constraint (Loc,
520 Make_Attribute_Reference (Loc,
521 Attribute_Name => Name_First,
522 Prefix => New_Occurrence_Of (Dtyp, Loc)),
524 Make_Integer_Literal (Loc,
525 Intval => UI_Max (Loval, Ahiv)))))));
527 Set_Etype (Discr, Tnn);
531 Next_Component (Comp);
533 end Adjust_Discriminants;
535 ---------------------------
536 -- Build_Array_Init_Proc --
537 ---------------------------
539 procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id) is
540 Loc : constant Source_Ptr := Sloc (Nod);
541 Comp_Type : constant Entity_Id := Component_Type (A_Type);
542 Index_List : List_Id;
544 Body_Stmts : List_Id;
545 Has_Default_Init : Boolean;
547 function Init_Component return List_Id;
548 -- Create one statement to initialize one array component, designated
549 -- by a full set of indices.
551 function Init_One_Dimension (N : Int) return List_Id;
552 -- Create loop to initialize one dimension of the array. The single
553 -- statement in the loop body initializes the inner dimensions if any,
554 -- or else the single component. Note that this procedure is called
555 -- recursively, with N being the dimension to be initialized. A call
556 -- with N greater than the number of dimensions simply generates the
557 -- component initialization, terminating the recursion.
563 function Init_Component return List_Id is
568 Make_Indexed_Component (Loc,
569 Prefix => Make_Identifier (Loc, Name_uInit),
570 Expressions => Index_List);
572 if Needs_Simple_Initialization (Comp_Type) then
573 Set_Assignment_OK (Comp);
575 Make_Assignment_Statement (Loc,
579 (Comp_Type, Nod, Component_Size (A_Type))));
582 Clean_Task_Names (Comp_Type, Proc_Id);
584 Build_Initialization_Call
585 (Loc, Comp, Comp_Type,
586 In_Init_Proc => True,
587 Enclos_Type => A_Type);
591 ------------------------
592 -- Init_One_Dimension --
593 ------------------------
595 function Init_One_Dimension (N : Int) return List_Id is
599 -- If the component does not need initializing, then there is nothing
600 -- to do here, so we return a null body. This occurs when generating
601 -- the dummy Init_Proc needed for Initialize_Scalars processing.
603 if not Has_Non_Null_Base_Init_Proc (Comp_Type)
604 and then not Needs_Simple_Initialization (Comp_Type)
605 and then not Has_Task (Comp_Type)
607 return New_List (Make_Null_Statement (Loc));
609 -- If all dimensions dealt with, we simply initialize the component
611 elsif N > Number_Dimensions (A_Type) then
612 return Init_Component;
614 -- Here we generate the required loop
618 Make_Defining_Identifier (Loc, New_External_Name ('J', N));
620 Append (New_Reference_To (Index, Loc), Index_List);
623 Make_Implicit_Loop_Statement (Nod,
626 Make_Iteration_Scheme (Loc,
627 Loop_Parameter_Specification =>
628 Make_Loop_Parameter_Specification (Loc,
629 Defining_Identifier => Index,
630 Discrete_Subtype_Definition =>
631 Make_Attribute_Reference (Loc,
632 Prefix => Make_Identifier (Loc, Name_uInit),
633 Attribute_Name => Name_Range,
634 Expressions => New_List (
635 Make_Integer_Literal (Loc, N))))),
636 Statements => Init_One_Dimension (N + 1)));
638 end Init_One_Dimension;
640 -- Start of processing for Build_Array_Init_Proc
643 -- Nothing to generate in the following cases:
645 -- 1. Initialization is suppressed for the type
646 -- 2. The type is a value type, in the CIL sense.
647 -- 3. The type has CIL/JVM convention.
648 -- 4. An initialization already exists for the base type
650 if Suppress_Init_Proc (A_Type)
651 or else Is_Value_Type (Comp_Type)
652 or else Convention (A_Type) = Convention_CIL
653 or else Convention (A_Type) = Convention_Java
654 or else Present (Base_Init_Proc (A_Type))
659 Index_List := New_List;
661 -- We need an initialization procedure if any of the following is true:
663 -- 1. The component type has an initialization procedure
664 -- 2. The component type needs simple initialization
665 -- 3. Tasks are present
666 -- 4. The type is marked as a public entity
668 -- The reason for the public entity test is to deal properly with the
669 -- Initialize_Scalars pragma. This pragma can be set in the client and
670 -- not in the declaring package, this means the client will make a call
671 -- to the initialization procedure (because one of conditions 1-3 must
672 -- apply in this case), and we must generate a procedure (even if it is
673 -- null) to satisfy the call in this case.
675 -- Exception: do not build an array init_proc for a type whose root
676 -- type is Standard.String or Standard.Wide_[Wide_]String, since there
677 -- is no place to put the code, and in any case we handle initialization
678 -- of such types (in the Initialize_Scalars case, that's the only time
679 -- the issue arises) in a special manner anyway which does not need an
682 Has_Default_Init := Has_Non_Null_Base_Init_Proc (Comp_Type)
683 or else Needs_Simple_Initialization (Comp_Type)
684 or else Has_Task (Comp_Type);
687 or else (not Restriction_Active (No_Initialize_Scalars)
688 and then Is_Public (A_Type)
689 and then Root_Type (A_Type) /= Standard_String
690 and then Root_Type (A_Type) /= Standard_Wide_String
691 and then Root_Type (A_Type) /= Standard_Wide_Wide_String)
694 Make_Defining_Identifier (Loc,
695 Chars => Make_Init_Proc_Name (A_Type));
697 -- If No_Default_Initialization restriction is active, then we don't
698 -- want to build an init_proc, but we need to mark that an init_proc
699 -- would be needed if this restriction was not active (so that we can
700 -- detect attempts to call it), so set a dummy init_proc in place.
701 -- This is only done though when actual default initialization is
702 -- needed (and not done when only Is_Public is True), since otherwise
703 -- objects such as arrays of scalars could be wrongly flagged as
704 -- violating the restriction.
706 if Restriction_Active (No_Default_Initialization) then
707 if Has_Default_Init then
708 Set_Init_Proc (A_Type, Proc_Id);
714 Body_Stmts := Init_One_Dimension (1);
717 Make_Subprogram_Body (Loc,
719 Make_Procedure_Specification (Loc,
720 Defining_Unit_Name => Proc_Id,
721 Parameter_Specifications => Init_Formals (A_Type)),
722 Declarations => New_List,
723 Handled_Statement_Sequence =>
724 Make_Handled_Sequence_Of_Statements (Loc,
725 Statements => Body_Stmts)));
727 Set_Ekind (Proc_Id, E_Procedure);
728 Set_Is_Public (Proc_Id, Is_Public (A_Type));
729 Set_Is_Internal (Proc_Id);
730 Set_Has_Completion (Proc_Id);
732 if not Debug_Generated_Code then
733 Set_Debug_Info_Off (Proc_Id);
736 -- Set inlined unless controlled stuff or tasks around, in which
737 -- case we do not want to inline, because nested stuff may cause
738 -- difficulties in inter-unit inlining, and furthermore there is
739 -- in any case no point in inlining such complex init procs.
741 if not Has_Task (Proc_Id)
742 and then not Needs_Finalization (Proc_Id)
744 Set_Is_Inlined (Proc_Id);
747 -- Associate Init_Proc with type, and determine if the procedure
748 -- is null (happens because of the Initialize_Scalars pragma case,
749 -- where we have to generate a null procedure in case it is called
750 -- by a client with Initialize_Scalars set). Such procedures have
751 -- to be generated, but do not have to be called, so we mark them
752 -- as null to suppress the call.
754 Set_Init_Proc (A_Type, Proc_Id);
756 if List_Length (Body_Stmts) = 1
758 -- We must skip SCIL nodes because they may have been added to this
759 -- list by Insert_Actions.
761 and then Nkind (First_Non_SCIL_Node (Body_Stmts)) = N_Null_Statement
763 Set_Is_Null_Init_Proc (Proc_Id);
766 -- Try to build a static aggregate to initialize statically
767 -- objects of the type. This can only be done for constrained
768 -- one-dimensional arrays with static bounds.
770 Set_Static_Initialization
772 Build_Equivalent_Array_Aggregate (First_Subtype (A_Type)));
775 end Build_Array_Init_Proc;
777 -----------------------------
778 -- Build_Class_Wide_Master --
779 -----------------------------
781 procedure Build_Class_Wide_Master (T : Entity_Id) is
782 Loc : constant Source_Ptr := Sloc (T);
789 -- Nothing to do if there is no task hierarchy
791 if Restriction_Active (No_Task_Hierarchy) then
795 -- Find declaration that created the access type: either a type
796 -- declaration, or an object declaration with an access definition,
797 -- in which case the type is anonymous.
800 P := Associated_Node_For_Itype (T);
805 -- Nothing to do if we already built a master entity for this scope
807 if not Has_Master_Entity (Scope (T)) then
809 -- First build the master entity
810 -- _Master : constant Master_Id := Current_Master.all;
811 -- and insert it just before the current declaration.
814 Make_Object_Declaration (Loc,
815 Defining_Identifier =>
816 Make_Defining_Identifier (Loc, Name_uMaster),
817 Constant_Present => True,
818 Object_Definition => New_Reference_To (Standard_Integer, Loc),
820 Make_Explicit_Dereference (Loc,
821 New_Reference_To (RTE (RE_Current_Master), Loc)));
823 Insert_Action (P, Decl);
825 Set_Has_Master_Entity (Scope (T));
827 -- Now mark the containing scope as a task master. Masters
828 -- associated with return statements are already marked at
829 -- this stage (see Analyze_Subprogram_Body).
831 if Ekind (Current_Scope) /= E_Return_Statement then
833 while Nkind (Par) /= N_Compilation_Unit loop
836 -- If we fall off the top, we are at the outer level, and the
837 -- environment task is our effective master, so nothing to mark.
840 (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body)
842 Set_Is_Task_Master (Par, True);
849 -- Now define the renaming of the master_id
852 Make_Defining_Identifier (Loc,
853 New_External_Name (Chars (T), 'M'));
856 Make_Object_Renaming_Declaration (Loc,
857 Defining_Identifier => M_Id,
858 Subtype_Mark => New_Reference_To (Standard_Integer, Loc),
859 Name => Make_Identifier (Loc, Name_uMaster));
860 Insert_Before (P, Decl);
863 Set_Master_Id (T, M_Id);
866 when RE_Not_Available =>
868 end Build_Class_Wide_Master;
870 --------------------------------
871 -- Build_Discr_Checking_Funcs --
872 --------------------------------
874 procedure Build_Discr_Checking_Funcs (N : Node_Id) is
877 Enclosing_Func_Id : Entity_Id;
882 function Build_Case_Statement
883 (Case_Id : Entity_Id;
884 Variant : Node_Id) return Node_Id;
885 -- Build a case statement containing only two alternatives. The first
886 -- alternative corresponds exactly to the discrete choices given on the
887 -- variant with contains the components that we are generating the
888 -- checks for. If the discriminant is one of these return False. The
889 -- second alternative is an OTHERS choice that will return True
890 -- indicating the discriminant did not match.
892 function Build_Dcheck_Function
893 (Case_Id : Entity_Id;
894 Variant : Node_Id) return Entity_Id;
895 -- Build the discriminant checking function for a given variant
897 procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id);
898 -- Builds the discriminant checking function for each variant of the
899 -- given variant part of the record type.
901 --------------------------
902 -- Build_Case_Statement --
903 --------------------------
905 function Build_Case_Statement
906 (Case_Id : Entity_Id;
907 Variant : Node_Id) return Node_Id
909 Alt_List : constant List_Id := New_List;
910 Actuals_List : List_Id;
912 Case_Alt_Node : Node_Id;
914 Choice_List : List_Id;
916 Return_Node : Node_Id;
919 Case_Node := New_Node (N_Case_Statement, Loc);
921 -- Replace the discriminant which controls the variant, with the name
922 -- of the formal of the checking function.
924 Set_Expression (Case_Node,
925 Make_Identifier (Loc, Chars (Case_Id)));
927 Choice := First (Discrete_Choices (Variant));
929 if Nkind (Choice) = N_Others_Choice then
930 Choice_List := New_Copy_List (Others_Discrete_Choices (Choice));
932 Choice_List := New_Copy_List (Discrete_Choices (Variant));
935 if not Is_Empty_List (Choice_List) then
936 Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
937 Set_Discrete_Choices (Case_Alt_Node, Choice_List);
939 -- In case this is a nested variant, we need to return the result
940 -- of the discriminant checking function for the immediately
941 -- enclosing variant.
943 if Present (Enclosing_Func_Id) then
944 Actuals_List := New_List;
946 D := First_Discriminant (Rec_Id);
947 while Present (D) loop
948 Append (Make_Identifier (Loc, Chars (D)), Actuals_List);
949 Next_Discriminant (D);
953 Make_Simple_Return_Statement (Loc,
955 Make_Function_Call (Loc,
957 New_Reference_To (Enclosing_Func_Id, Loc),
958 Parameter_Associations =>
963 Make_Simple_Return_Statement (Loc,
965 New_Reference_To (Standard_False, Loc));
968 Set_Statements (Case_Alt_Node, New_List (Return_Node));
969 Append (Case_Alt_Node, Alt_List);
972 Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
973 Choice_List := New_List (New_Node (N_Others_Choice, Loc));
974 Set_Discrete_Choices (Case_Alt_Node, Choice_List);
977 Make_Simple_Return_Statement (Loc,
979 New_Reference_To (Standard_True, Loc));
981 Set_Statements (Case_Alt_Node, New_List (Return_Node));
982 Append (Case_Alt_Node, Alt_List);
984 Set_Alternatives (Case_Node, Alt_List);
986 end Build_Case_Statement;
988 ---------------------------
989 -- Build_Dcheck_Function --
990 ---------------------------
992 function Build_Dcheck_Function
993 (Case_Id : Entity_Id;
994 Variant : Node_Id) return Entity_Id
998 Parameter_List : List_Id;
1002 Body_Node := New_Node (N_Subprogram_Body, Loc);
1003 Sequence := Sequence + 1;
1006 Make_Defining_Identifier (Loc,
1007 Chars => New_External_Name (Chars (Rec_Id), 'D', Sequence));
1009 Spec_Node := New_Node (N_Function_Specification, Loc);
1010 Set_Defining_Unit_Name (Spec_Node, Func_Id);
1012 Parameter_List := Build_Discriminant_Formals (Rec_Id, False);
1014 Set_Parameter_Specifications (Spec_Node, Parameter_List);
1015 Set_Result_Definition (Spec_Node,
1016 New_Reference_To (Standard_Boolean, Loc));
1017 Set_Specification (Body_Node, Spec_Node);
1018 Set_Declarations (Body_Node, New_List);
1020 Set_Handled_Statement_Sequence (Body_Node,
1021 Make_Handled_Sequence_Of_Statements (Loc,
1022 Statements => New_List (
1023 Build_Case_Statement (Case_Id, Variant))));
1025 Set_Ekind (Func_Id, E_Function);
1026 Set_Mechanism (Func_Id, Default_Mechanism);
1027 Set_Is_Inlined (Func_Id, True);
1028 Set_Is_Pure (Func_Id, True);
1029 Set_Is_Public (Func_Id, Is_Public (Rec_Id));
1030 Set_Is_Internal (Func_Id, True);
1032 if not Debug_Generated_Code then
1033 Set_Debug_Info_Off (Func_Id);
1036 Analyze (Body_Node);
1038 Append_Freeze_Action (Rec_Id, Body_Node);
1039 Set_Dcheck_Function (Variant, Func_Id);
1041 end Build_Dcheck_Function;
1043 ----------------------------
1044 -- Build_Dcheck_Functions --
1045 ----------------------------
1047 procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id) is
1048 Component_List_Node : Node_Id;
1050 Discr_Name : Entity_Id;
1051 Func_Id : Entity_Id;
1053 Saved_Enclosing_Func_Id : Entity_Id;
1056 -- Build the discriminant-checking function for each variant, and
1057 -- label all components of that variant with the function's name.
1058 -- We only Generate a discriminant-checking function when the
1059 -- variant is not empty, to prevent the creation of dead code.
1060 -- The exception to that is when Frontend_Layout_On_Target is set,
1061 -- because the variant record size function generated in package
1062 -- Layout needs to generate calls to all discriminant-checking
1063 -- functions, including those for empty variants.
1065 Discr_Name := Entity (Name (Variant_Part_Node));
1066 Variant := First_Non_Pragma (Variants (Variant_Part_Node));
1068 while Present (Variant) loop
1069 Component_List_Node := Component_List (Variant);
1071 if not Null_Present (Component_List_Node)
1072 or else Frontend_Layout_On_Target
1074 Func_Id := Build_Dcheck_Function (Discr_Name, Variant);
1076 First_Non_Pragma (Component_Items (Component_List_Node));
1078 while Present (Decl) loop
1079 Set_Discriminant_Checking_Func
1080 (Defining_Identifier (Decl), Func_Id);
1082 Next_Non_Pragma (Decl);
1085 if Present (Variant_Part (Component_List_Node)) then
1086 Saved_Enclosing_Func_Id := Enclosing_Func_Id;
1087 Enclosing_Func_Id := Func_Id;
1088 Build_Dcheck_Functions (Variant_Part (Component_List_Node));
1089 Enclosing_Func_Id := Saved_Enclosing_Func_Id;
1093 Next_Non_Pragma (Variant);
1095 end Build_Dcheck_Functions;
1097 -- Start of processing for Build_Discr_Checking_Funcs
1100 -- Only build if not done already
1102 if not Discr_Check_Funcs_Built (N) then
1103 Type_Def := Type_Definition (N);
1105 if Nkind (Type_Def) = N_Record_Definition then
1106 if No (Component_List (Type_Def)) then -- null record.
1109 V := Variant_Part (Component_List (Type_Def));
1112 else pragma Assert (Nkind (Type_Def) = N_Derived_Type_Definition);
1113 if No (Component_List (Record_Extension_Part (Type_Def))) then
1117 (Component_List (Record_Extension_Part (Type_Def)));
1121 Rec_Id := Defining_Identifier (N);
1123 if Present (V) and then not Is_Unchecked_Union (Rec_Id) then
1125 Enclosing_Func_Id := Empty;
1126 Build_Dcheck_Functions (V);
1129 Set_Discr_Check_Funcs_Built (N);
1131 end Build_Discr_Checking_Funcs;
1133 --------------------------------
1134 -- Build_Discriminant_Formals --
1135 --------------------------------
1137 function Build_Discriminant_Formals
1138 (Rec_Id : Entity_Id;
1139 Use_Dl : Boolean) return List_Id
1141 Loc : Source_Ptr := Sloc (Rec_Id);
1142 Parameter_List : constant List_Id := New_List;
1145 Formal_Type : Entity_Id;
1146 Param_Spec_Node : Node_Id;
1149 if Has_Discriminants (Rec_Id) then
1150 D := First_Discriminant (Rec_Id);
1151 while Present (D) loop
1155 Formal := Discriminal (D);
1156 Formal_Type := Etype (Formal);
1158 Formal := Make_Defining_Identifier (Loc, Chars (D));
1159 Formal_Type := Etype (D);
1163 Make_Parameter_Specification (Loc,
1164 Defining_Identifier => Formal,
1166 New_Reference_To (Formal_Type, Loc));
1167 Append (Param_Spec_Node, Parameter_List);
1168 Next_Discriminant (D);
1172 return Parameter_List;
1173 end Build_Discriminant_Formals;
1175 --------------------------------------
1176 -- Build_Equivalent_Array_Aggregate --
1177 --------------------------------------
1179 function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id is
1180 Loc : constant Source_Ptr := Sloc (T);
1181 Comp_Type : constant Entity_Id := Component_Type (T);
1182 Index_Type : constant Entity_Id := Etype (First_Index (T));
1183 Proc : constant Entity_Id := Base_Init_Proc (T);
1189 if not Is_Constrained (T)
1190 or else Number_Dimensions (T) > 1
1193 Initialization_Warning (T);
1197 Lo := Type_Low_Bound (Index_Type);
1198 Hi := Type_High_Bound (Index_Type);
1200 if not Compile_Time_Known_Value (Lo)
1201 or else not Compile_Time_Known_Value (Hi)
1203 Initialization_Warning (T);
1207 if Is_Record_Type (Comp_Type)
1208 and then Present (Base_Init_Proc (Comp_Type))
1210 Expr := Static_Initialization (Base_Init_Proc (Comp_Type));
1213 Initialization_Warning (T);
1218 Initialization_Warning (T);
1222 Aggr := Make_Aggregate (Loc, No_List, New_List);
1223 Set_Etype (Aggr, T);
1224 Set_Aggregate_Bounds (Aggr,
1226 Low_Bound => New_Copy (Lo),
1227 High_Bound => New_Copy (Hi)));
1228 Set_Parent (Aggr, Parent (Proc));
1230 Append_To (Component_Associations (Aggr),
1231 Make_Component_Association (Loc,
1235 Low_Bound => New_Copy (Lo),
1236 High_Bound => New_Copy (Hi))),
1237 Expression => Expr));
1239 if Static_Array_Aggregate (Aggr) then
1242 Initialization_Warning (T);
1245 end Build_Equivalent_Array_Aggregate;
1247 ---------------------------------------
1248 -- Build_Equivalent_Record_Aggregate --
1249 ---------------------------------------
1251 function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id is
1254 Comp_Type : Entity_Id;
1256 -- Start of processing for Build_Equivalent_Record_Aggregate
1259 if not Is_Record_Type (T)
1260 or else Has_Discriminants (T)
1261 or else Is_Limited_Type (T)
1262 or else Has_Non_Standard_Rep (T)
1264 Initialization_Warning (T);
1268 Comp := First_Component (T);
1270 -- A null record needs no warning
1276 while Present (Comp) loop
1278 -- Array components are acceptable if initialized by a positional
1279 -- aggregate with static components.
1281 if Is_Array_Type (Etype (Comp)) then
1282 Comp_Type := Component_Type (Etype (Comp));
1284 if Nkind (Parent (Comp)) /= N_Component_Declaration
1285 or else No (Expression (Parent (Comp)))
1286 or else Nkind (Expression (Parent (Comp))) /= N_Aggregate
1288 Initialization_Warning (T);
1291 elsif Is_Scalar_Type (Component_Type (Etype (Comp)))
1293 (not Compile_Time_Known_Value (Type_Low_Bound (Comp_Type))
1295 not Compile_Time_Known_Value (Type_High_Bound (Comp_Type)))
1297 Initialization_Warning (T);
1301 not Static_Array_Aggregate (Expression (Parent (Comp)))
1303 Initialization_Warning (T);
1307 elsif Is_Scalar_Type (Etype (Comp)) then
1308 Comp_Type := Etype (Comp);
1310 if Nkind (Parent (Comp)) /= N_Component_Declaration
1311 or else No (Expression (Parent (Comp)))
1312 or else not Compile_Time_Known_Value (Expression (Parent (Comp)))
1313 or else not Compile_Time_Known_Value (Type_Low_Bound (Comp_Type))
1315 Compile_Time_Known_Value (Type_High_Bound (Comp_Type))
1317 Initialization_Warning (T);
1321 -- For now, other types are excluded
1324 Initialization_Warning (T);
1328 Next_Component (Comp);
1331 -- All components have static initialization. Build positional aggregate
1332 -- from the given expressions or defaults.
1334 Agg := Make_Aggregate (Sloc (T), New_List, New_List);
1335 Set_Parent (Agg, Parent (T));
1337 Comp := First_Component (T);
1338 while Present (Comp) loop
1340 (New_Copy_Tree (Expression (Parent (Comp))), Expressions (Agg));
1341 Next_Component (Comp);
1344 Analyze_And_Resolve (Agg, T);
1346 end Build_Equivalent_Record_Aggregate;
1348 -------------------------------
1349 -- Build_Initialization_Call --
1350 -------------------------------
1352 -- References to a discriminant inside the record type declaration can
1353 -- appear either in the subtype_indication to constrain a record or an
1354 -- array, or as part of a larger expression given for the initial value
1355 -- of a component. In both of these cases N appears in the record
1356 -- initialization procedure and needs to be replaced by the formal
1357 -- parameter of the initialization procedure which corresponds to that
1360 -- In the example below, references to discriminants D1 and D2 in proc_1
1361 -- are replaced by references to formals with the same name
1364 -- A similar replacement is done for calls to any record initialization
1365 -- procedure for any components that are themselves of a record type.
1367 -- type R (D1, D2 : Integer) is record
1368 -- X : Integer := F * D1;
1369 -- Y : Integer := F * D2;
1372 -- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
1376 -- Out_2.X := F * D1;
1377 -- Out_2.Y := F * D2;
1380 function Build_Initialization_Call
1384 In_Init_Proc : Boolean := False;
1385 Enclos_Type : Entity_Id := Empty;
1386 Discr_Map : Elist_Id := New_Elmt_List;
1387 With_Default_Init : Boolean := False;
1388 Constructor_Ref : Node_Id := Empty) return List_Id
1390 Res : constant List_Id := New_List;
1393 Controller_Typ : Entity_Id;
1397 First_Arg : Node_Id;
1398 Full_Init_Type : Entity_Id;
1399 Full_Type : Entity_Id := Typ;
1400 Init_Type : Entity_Id;
1404 pragma Assert (Constructor_Ref = Empty
1405 or else Is_CPP_Constructor_Call (Constructor_Ref));
1407 if No (Constructor_Ref) then
1408 Proc := Base_Init_Proc (Typ);
1410 Proc := Base_Init_Proc (Typ, Entity (Name (Constructor_Ref)));
1413 pragma Assert (Present (Proc));
1414 Init_Type := Etype (First_Formal (Proc));
1415 Full_Init_Type := Underlying_Type (Init_Type);
1417 -- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
1418 -- is active (in which case we make the call anyway, since in the
1419 -- actual compiled client it may be non null).
1420 -- Also nothing to do for value types.
1422 if (Is_Null_Init_Proc (Proc) and then not Init_Or_Norm_Scalars)
1423 or else Is_Value_Type (Typ)
1425 (Is_Array_Type (Typ) and then Is_Value_Type (Component_Type (Typ)))
1430 -- Go to full view if private type. In the case of successive
1431 -- private derivations, this can require more than one step.
1433 while Is_Private_Type (Full_Type)
1434 and then Present (Full_View (Full_Type))
1436 Full_Type := Full_View (Full_Type);
1439 -- If Typ is derived, the procedure is the initialization procedure for
1440 -- the root type. Wrap the argument in an conversion to make it type
1441 -- honest. Actually it isn't quite type honest, because there can be
1442 -- conflicts of views in the private type case. That is why we set
1443 -- Conversion_OK in the conversion node.
1445 if (Is_Record_Type (Typ)
1446 or else Is_Array_Type (Typ)
1447 or else Is_Private_Type (Typ))
1448 and then Init_Type /= Base_Type (Typ)
1450 First_Arg := OK_Convert_To (Etype (Init_Type), Id_Ref);
1451 Set_Etype (First_Arg, Init_Type);
1454 First_Arg := Id_Ref;
1457 Args := New_List (Convert_Concurrent (First_Arg, Typ));
1459 -- In the tasks case, add _Master as the value of the _Master parameter
1460 -- and _Chain as the value of the _Chain parameter. At the outer level,
1461 -- these will be variables holding the corresponding values obtained
1462 -- from GNARL. At inner levels, they will be the parameters passed down
1463 -- through the outer routines.
1465 if Has_Task (Full_Type) then
1466 if Restriction_Active (No_Task_Hierarchy) then
1468 -- See comments in System.Tasking.Initialization.Init_RTS
1469 -- for the value 3 (should be rtsfindable constant ???)
1471 Append_To (Args, Make_Integer_Literal (Loc, 3));
1474 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
1477 Append_To (Args, Make_Identifier (Loc, Name_uChain));
1479 -- Ada 2005 (AI-287): In case of default initialized components
1480 -- with tasks, we generate a null string actual parameter.
1481 -- This is just a workaround that must be improved later???
1483 if With_Default_Init then
1485 Make_String_Literal (Loc,
1490 Build_Task_Image_Decls (Loc, Id_Ref, Enclos_Type, In_Init_Proc);
1491 Decl := Last (Decls);
1494 New_Occurrence_Of (Defining_Identifier (Decl), Loc));
1495 Append_List (Decls, Res);
1503 -- Add discriminant values if discriminants are present
1505 if Has_Discriminants (Full_Init_Type) then
1506 Discr := First_Discriminant (Full_Init_Type);
1508 while Present (Discr) loop
1510 -- If this is a discriminated concurrent type, the init_proc
1511 -- for the corresponding record is being called. Use that type
1512 -- directly to find the discriminant value, to handle properly
1513 -- intervening renamed discriminants.
1516 T : Entity_Id := Full_Type;
1519 if Is_Protected_Type (T) then
1520 T := Corresponding_Record_Type (T);
1522 elsif Is_Private_Type (T)
1523 and then Present (Underlying_Full_View (T))
1524 and then Is_Protected_Type (Underlying_Full_View (T))
1526 T := Corresponding_Record_Type (Underlying_Full_View (T));
1530 Get_Discriminant_Value (
1533 Discriminant_Constraint (Full_Type));
1536 if In_Init_Proc then
1538 -- Replace any possible references to the discriminant in the
1539 -- call to the record initialization procedure with references
1540 -- to the appropriate formal parameter.
1542 if Nkind (Arg) = N_Identifier
1543 and then Ekind (Entity (Arg)) = E_Discriminant
1545 Arg := New_Reference_To (Discriminal (Entity (Arg)), Loc);
1547 -- Case of access discriminants. We replace the reference
1548 -- to the type by a reference to the actual object
1550 elsif Nkind (Arg) = N_Attribute_Reference
1551 and then Is_Access_Type (Etype (Arg))
1552 and then Is_Entity_Name (Prefix (Arg))
1553 and then Is_Type (Entity (Prefix (Arg)))
1556 Make_Attribute_Reference (Loc,
1557 Prefix => New_Copy (Prefix (Id_Ref)),
1558 Attribute_Name => Name_Unrestricted_Access);
1560 -- Otherwise make a copy of the default expression. Note that
1561 -- we use the current Sloc for this, because we do not want the
1562 -- call to appear to be at the declaration point. Within the
1563 -- expression, replace discriminants with their discriminals.
1567 New_Copy_Tree (Arg, Map => Discr_Map, New_Sloc => Loc);
1571 if Is_Constrained (Full_Type) then
1572 Arg := Duplicate_Subexpr_No_Checks (Arg);
1574 -- The constraints come from the discriminant default exps,
1575 -- they must be reevaluated, so we use New_Copy_Tree but we
1576 -- ensure the proper Sloc (for any embedded calls).
1578 Arg := New_Copy_Tree (Arg, New_Sloc => Loc);
1582 -- Ada 2005 (AI-287): In case of default initialized components,
1583 -- if the component is constrained with a discriminant of the
1584 -- enclosing type, we need to generate the corresponding selected
1585 -- component node to access the discriminant value. In other cases
1586 -- this is not required, either because we are inside the init
1587 -- proc and we use the corresponding formal, or else because the
1588 -- component is constrained by an expression.
1590 if With_Default_Init
1591 and then Nkind (Id_Ref) = N_Selected_Component
1592 and then Nkind (Arg) = N_Identifier
1593 and then Ekind (Entity (Arg)) = E_Discriminant
1596 Make_Selected_Component (Loc,
1597 Prefix => New_Copy_Tree (Prefix (Id_Ref)),
1598 Selector_Name => Arg));
1600 Append_To (Args, Arg);
1603 Next_Discriminant (Discr);
1607 -- If this is a call to initialize the parent component of a derived
1608 -- tagged type, indicate that the tag should not be set in the parent.
1610 if Is_Tagged_Type (Full_Init_Type)
1611 and then not Is_CPP_Class (Full_Init_Type)
1612 and then Nkind (Id_Ref) = N_Selected_Component
1613 and then Chars (Selector_Name (Id_Ref)) = Name_uParent
1615 Append_To (Args, New_Occurrence_Of (Standard_False, Loc));
1617 elsif Present (Constructor_Ref) then
1618 Append_List_To (Args,
1619 New_Copy_List (Parameter_Associations (Constructor_Ref)));
1623 Make_Procedure_Call_Statement (Loc,
1624 Name => New_Occurrence_Of (Proc, Loc),
1625 Parameter_Associations => Args));
1627 if Needs_Finalization (Typ)
1628 and then Nkind (Id_Ref) = N_Selected_Component
1630 if Chars (Selector_Name (Id_Ref)) /= Name_uParent then
1631 Append_List_To (Res,
1633 Ref => New_Copy_Tree (First_Arg),
1636 Find_Final_List (Typ, New_Copy_Tree (First_Arg)),
1637 With_Attach => Make_Integer_Literal (Loc, 1)));
1639 -- If the enclosing type is an extension with new controlled
1640 -- components, it has his own record controller. If the parent
1641 -- also had a record controller, attach it to the new one.
1643 -- Build_Init_Statements relies on the fact that in this specific
1644 -- case the last statement of the result is the attach call to
1645 -- the controller. If this is changed, it must be synchronized.
1647 elsif Present (Enclos_Type)
1648 and then Has_New_Controlled_Component (Enclos_Type)
1649 and then Has_Controlled_Component (Typ)
1651 if Is_Inherently_Limited_Type (Typ) then
1652 Controller_Typ := RTE (RE_Limited_Record_Controller);
1654 Controller_Typ := RTE (RE_Record_Controller);
1657 Append_List_To (Res,
1660 Make_Selected_Component (Loc,
1661 Prefix => New_Copy_Tree (First_Arg),
1662 Selector_Name => Make_Identifier (Loc, Name_uController)),
1663 Typ => Controller_Typ,
1664 Flist_Ref => Find_Final_List (Typ, New_Copy_Tree (First_Arg)),
1665 With_Attach => Make_Integer_Literal (Loc, 1)));
1672 when RE_Not_Available =>
1674 end Build_Initialization_Call;
1676 ---------------------------
1677 -- Build_Master_Renaming --
1678 ---------------------------
1680 function Build_Master_Renaming
1682 T : Entity_Id) return Entity_Id
1684 Loc : constant Source_Ptr := Sloc (N);
1689 -- Nothing to do if there is no task hierarchy
1691 if Restriction_Active (No_Task_Hierarchy) then
1696 Make_Defining_Identifier (Loc,
1697 New_External_Name (Chars (T), 'M'));
1700 Make_Object_Renaming_Declaration (Loc,
1701 Defining_Identifier => M_Id,
1702 Subtype_Mark => New_Reference_To (RTE (RE_Master_Id), Loc),
1703 Name => Make_Identifier (Loc, Name_uMaster));
1704 Insert_Before (N, Decl);
1709 when RE_Not_Available =>
1711 end Build_Master_Renaming;
1713 ---------------------------
1714 -- Build_Master_Renaming --
1715 ---------------------------
1717 procedure Build_Master_Renaming (N : Node_Id; T : Entity_Id) is
1721 -- Nothing to do if there is no task hierarchy
1723 if Restriction_Active (No_Task_Hierarchy) then
1727 M_Id := Build_Master_Renaming (N, T);
1728 Set_Master_Id (T, M_Id);
1731 when RE_Not_Available =>
1733 end Build_Master_Renaming;
1735 ----------------------------
1736 -- Build_Record_Init_Proc --
1737 ----------------------------
1739 procedure Build_Record_Init_Proc (N : Node_Id; Pe : Entity_Id) is
1740 Loc : Source_Ptr := Sloc (N);
1741 Discr_Map : constant Elist_Id := New_Elmt_List;
1742 Proc_Id : Entity_Id;
1743 Rec_Type : Entity_Id;
1744 Set_Tag : Entity_Id := Empty;
1746 function Build_Assignment (Id : Entity_Id; N : Node_Id) return List_Id;
1747 -- Build a assignment statement node which assigns to record component
1748 -- its default expression if defined. The assignment left hand side is
1749 -- marked Assignment_OK so that initialization of limited private
1750 -- records works correctly, Return also the adjustment call for
1751 -- controlled objects
1753 procedure Build_Discriminant_Assignments (Statement_List : List_Id);
1754 -- If the record has discriminants, adds assignment statements to
1755 -- statement list to initialize the discriminant values from the
1756 -- arguments of the initialization procedure.
1758 function Build_Init_Statements (Comp_List : Node_Id) return List_Id;
1759 -- Build a list representing a sequence of statements which initialize
1760 -- components of the given component list. This may involve building
1761 -- case statements for the variant parts.
1763 function Build_Init_Call_Thru (Parameters : List_Id) return List_Id;
1764 -- Given a non-tagged type-derivation that declares discriminants,
1767 -- type R (R1, R2 : Integer) is record ... end record;
1769 -- type D (D1 : Integer) is new R (1, D1);
1771 -- we make the _init_proc of D be
1773 -- procedure _init_proc(X : D; D1 : Integer) is
1775 -- _init_proc( R(X), 1, D1);
1778 -- This function builds the call statement in this _init_proc.
1780 procedure Build_Init_Procedure;
1781 -- Build the tree corresponding to the procedure specification and body
1782 -- of the initialization procedure (by calling all the preceding
1783 -- auxiliary routines), and install it as the _init TSS.
1785 procedure Build_Offset_To_Top_Functions;
1786 -- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
1787 -- and body of the Offset_To_Top function that is generated when the
1788 -- parent of a type with discriminants has secondary dispatch tables.
1790 procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id);
1791 -- Add range checks to components of discriminated records. S is a
1792 -- subtype indication of a record component. Check_List is a list
1793 -- to which the check actions are appended.
1795 function Component_Needs_Simple_Initialization
1796 (T : Entity_Id) return Boolean;
1797 -- Determines if a component needs simple initialization, given its type
1798 -- T. This is the same as Needs_Simple_Initialization except for the
1799 -- following difference: the types Tag and Interface_Tag, that are
1800 -- access types which would normally require simple initialization to
1801 -- null, do not require initialization as components, since they are
1802 -- explicitly initialized by other means.
1804 procedure Constrain_Array
1806 Check_List : List_Id);
1807 -- Called from Build_Record_Checks.
1808 -- Apply a list of index constraints to an unconstrained array type.
1809 -- The first parameter is the entity for the resulting subtype.
1810 -- Check_List is a list to which the check actions are appended.
1812 procedure Constrain_Index
1815 Check_List : List_Id);
1816 -- Process an index constraint in a constrained array declaration.
1817 -- The constraint can be a subtype name, or a range with or without
1818 -- an explicit subtype mark. The index is the corresponding index of the
1819 -- unconstrained array. S is the range expression. Check_List is a list
1820 -- to which the check actions are appended (called from
1821 -- Build_Record_Checks).
1823 function Parent_Subtype_Renaming_Discrims return Boolean;
1824 -- Returns True for base types N that rename discriminants, else False
1826 function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean;
1827 -- Determines whether a record initialization procedure needs to be
1828 -- generated for the given record type.
1830 ----------------------
1831 -- Build_Assignment --
1832 ----------------------
1834 function Build_Assignment (Id : Entity_Id; N : Node_Id) return List_Id is
1837 Typ : constant Entity_Id := Underlying_Type (Etype (Id));
1838 Kind : Node_Kind := Nkind (N);
1844 Make_Selected_Component (Loc,
1845 Prefix => Make_Identifier (Loc, Name_uInit),
1846 Selector_Name => New_Occurrence_Of (Id, Loc));
1847 Set_Assignment_OK (Lhs);
1849 -- Case of an access attribute applied to the current instance.
1850 -- Replace the reference to the type by a reference to the actual
1851 -- object. (Note that this handles the case of the top level of
1852 -- the expression being given by such an attribute, but does not
1853 -- cover uses nested within an initial value expression. Nested
1854 -- uses are unlikely to occur in practice, but are theoretically
1855 -- possible. It is not clear how to handle them without fully
1856 -- traversing the expression. ???
1858 if Kind = N_Attribute_Reference
1859 and then (Attribute_Name (N) = Name_Unchecked_Access
1861 Attribute_Name (N) = Name_Unrestricted_Access)
1862 and then Is_Entity_Name (Prefix (N))
1863 and then Is_Type (Entity (Prefix (N)))
1864 and then Entity (Prefix (N)) = Rec_Type
1867 Make_Attribute_Reference (Loc,
1868 Prefix => Make_Identifier (Loc, Name_uInit),
1869 Attribute_Name => Name_Unrestricted_Access);
1872 -- Take a copy of Exp to ensure that later copies of this component
1873 -- declaration in derived types see the original tree, not a node
1874 -- rewritten during expansion of the init_proc. If the copy contains
1875 -- itypes, the scope of the new itypes is the init_proc being built.
1877 Exp := New_Copy_Tree (Exp, New_Scope => Proc_Id);
1880 Make_Assignment_Statement (Loc,
1882 Expression => Exp));
1884 Set_No_Ctrl_Actions (First (Res));
1886 -- Adjust the tag if tagged (because of possible view conversions).
1887 -- Suppress the tag adjustment when VM_Target because VM tags are
1888 -- represented implicitly in objects.
1890 if Is_Tagged_Type (Typ) and then Tagged_Type_Expansion then
1892 Make_Assignment_Statement (Loc,
1894 Make_Selected_Component (Loc,
1895 Prefix => New_Copy_Tree (Lhs, New_Scope => Proc_Id),
1897 New_Reference_To (First_Tag_Component (Typ), Loc)),
1900 Unchecked_Convert_To (RTE (RE_Tag),
1902 (Node (First_Elmt (Access_Disp_Table (Typ))), Loc))));
1905 -- Adjust the component if controlled except if it is an aggregate
1906 -- that will be expanded inline.
1908 if Kind = N_Qualified_Expression then
1909 Kind := Nkind (Expression (N));
1912 if Needs_Finalization (Typ)
1913 and then not (Nkind_In (Kind, N_Aggregate, N_Extension_Aggregate))
1914 and then not Is_Inherently_Limited_Type (Typ)
1917 Ref : constant Node_Id :=
1918 New_Copy_Tree (Lhs, New_Scope => Proc_Id);
1920 Append_List_To (Res,
1924 Flist_Ref => Find_Final_List (Etype (Id), Ref),
1925 With_Attach => Make_Integer_Literal (Loc, 1)));
1932 when RE_Not_Available =>
1934 end Build_Assignment;
1936 ------------------------------------
1937 -- Build_Discriminant_Assignments --
1938 ------------------------------------
1940 procedure Build_Discriminant_Assignments (Statement_List : List_Id) is
1942 Is_Tagged : constant Boolean := Is_Tagged_Type (Rec_Type);
1945 if Has_Discriminants (Rec_Type)
1946 and then not Is_Unchecked_Union (Rec_Type)
1948 D := First_Discriminant (Rec_Type);
1950 while Present (D) loop
1952 -- Don't generate the assignment for discriminants in derived
1953 -- tagged types if the discriminant is a renaming of some
1954 -- ancestor discriminant. This initialization will be done
1955 -- when initializing the _parent field of the derived record.
1957 if Is_Tagged and then
1958 Present (Corresponding_Discriminant (D))
1964 Append_List_To (Statement_List,
1965 Build_Assignment (D,
1966 New_Reference_To (Discriminal (D), Loc)));
1969 Next_Discriminant (D);
1972 end Build_Discriminant_Assignments;
1974 --------------------------
1975 -- Build_Init_Call_Thru --
1976 --------------------------
1978 function Build_Init_Call_Thru (Parameters : List_Id) return List_Id is
1979 Parent_Proc : constant Entity_Id :=
1980 Base_Init_Proc (Etype (Rec_Type));
1982 Parent_Type : constant Entity_Id :=
1983 Etype (First_Formal (Parent_Proc));
1985 Uparent_Type : constant Entity_Id :=
1986 Underlying_Type (Parent_Type);
1988 First_Discr_Param : Node_Id;
1990 Parent_Discr : Entity_Id;
1991 First_Arg : Node_Id;
1997 -- First argument (_Init) is the object to be initialized.
1998 -- ??? not sure where to get a reasonable Loc for First_Arg
2001 OK_Convert_To (Parent_Type,
2002 New_Reference_To (Defining_Identifier (First (Parameters)), Loc));
2004 Set_Etype (First_Arg, Parent_Type);
2006 Args := New_List (Convert_Concurrent (First_Arg, Rec_Type));
2008 -- In the tasks case,
2009 -- add _Master as the value of the _Master parameter
2010 -- add _Chain as the value of the _Chain parameter.
2011 -- add _Task_Name as the value of the _Task_Name parameter.
2012 -- At the outer level, these will be variables holding the
2013 -- corresponding values obtained from GNARL or the expander.
2015 -- At inner levels, they will be the parameters passed down through
2016 -- the outer routines.
2018 First_Discr_Param := Next (First (Parameters));
2020 if Has_Task (Rec_Type) then
2021 if Restriction_Active (No_Task_Hierarchy) then
2023 -- See comments in System.Tasking.Initialization.Init_RTS
2026 Append_To (Args, Make_Integer_Literal (Loc, 3));
2028 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
2031 Append_To (Args, Make_Identifier (Loc, Name_uChain));
2032 Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
2033 First_Discr_Param := Next (Next (Next (First_Discr_Param)));
2036 -- Append discriminant values
2038 if Has_Discriminants (Uparent_Type) then
2039 pragma Assert (not Is_Tagged_Type (Uparent_Type));
2041 Parent_Discr := First_Discriminant (Uparent_Type);
2042 while Present (Parent_Discr) loop
2044 -- Get the initial value for this discriminant
2045 -- ??? needs to be cleaned up to use parent_Discr_Constr
2049 Discr_Value : Elmt_Id :=
2051 (Stored_Constraint (Rec_Type));
2053 Discr : Entity_Id :=
2054 First_Stored_Discriminant (Uparent_Type);
2056 while Original_Record_Component (Parent_Discr) /= Discr loop
2057 Next_Stored_Discriminant (Discr);
2058 Next_Elmt (Discr_Value);
2061 Arg := Node (Discr_Value);
2064 -- Append it to the list
2066 if Nkind (Arg) = N_Identifier
2067 and then Ekind (Entity (Arg)) = E_Discriminant
2070 New_Reference_To (Discriminal (Entity (Arg)), Loc));
2072 -- Case of access discriminants. We replace the reference
2073 -- to the type by a reference to the actual object.
2075 -- Is above comment right??? Use of New_Copy below seems mighty
2079 Append_To (Args, New_Copy (Arg));
2082 Next_Discriminant (Parent_Discr);
2088 Make_Procedure_Call_Statement (Loc,
2089 Name => New_Occurrence_Of (Parent_Proc, Loc),
2090 Parameter_Associations => Args));
2093 end Build_Init_Call_Thru;
2095 -----------------------------------
2096 -- Build_Offset_To_Top_Functions --
2097 -----------------------------------
2099 procedure Build_Offset_To_Top_Functions is
2101 procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id);
2103 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2105 -- return O.Iface_Comp'Position;
2108 ----------------------------------
2109 -- Build_Offset_To_Top_Function --
2110 ----------------------------------
2112 procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id) is
2113 Body_Node : Node_Id;
2114 Func_Id : Entity_Id;
2115 Spec_Node : Node_Id;
2119 Make_Defining_Identifier (Loc,
2120 Chars => New_Internal_Name ('F'));
2122 Set_DT_Offset_To_Top_Func (Iface_Comp, Func_Id);
2125 -- function Fxx (O : in Rec_Typ) return Storage_Offset;
2127 Spec_Node := New_Node (N_Function_Specification, Loc);
2128 Set_Defining_Unit_Name (Spec_Node, Func_Id);
2129 Set_Parameter_Specifications (Spec_Node, New_List (
2130 Make_Parameter_Specification (Loc,
2131 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uO),
2133 Parameter_Type => New_Reference_To (Rec_Type, Loc))));
2134 Set_Result_Definition (Spec_Node,
2135 New_Reference_To (RTE (RE_Storage_Offset), Loc));
2138 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2140 -- return O.Iface_Comp'Position;
2143 Body_Node := New_Node (N_Subprogram_Body, Loc);
2144 Set_Specification (Body_Node, Spec_Node);
2145 Set_Declarations (Body_Node, New_List);
2146 Set_Handled_Statement_Sequence (Body_Node,
2147 Make_Handled_Sequence_Of_Statements (Loc,
2148 Statements => New_List (
2149 Make_Simple_Return_Statement (Loc,
2151 Make_Attribute_Reference (Loc,
2153 Make_Selected_Component (Loc,
2154 Prefix => Make_Identifier (Loc, Name_uO),
2155 Selector_Name => New_Reference_To
2157 Attribute_Name => Name_Position)))));
2159 Set_Ekind (Func_Id, E_Function);
2160 Set_Mechanism (Func_Id, Default_Mechanism);
2161 Set_Is_Internal (Func_Id, True);
2163 if not Debug_Generated_Code then
2164 Set_Debug_Info_Off (Func_Id);
2167 Analyze (Body_Node);
2169 Append_Freeze_Action (Rec_Type, Body_Node);
2170 end Build_Offset_To_Top_Function;
2174 Ifaces_Comp_List : Elist_Id;
2175 Iface_Comp_Elmt : Elmt_Id;
2176 Iface_Comp : Node_Id;
2178 -- Start of processing for Build_Offset_To_Top_Functions
2181 -- Offset_To_Top_Functions are built only for derivations of types
2182 -- with discriminants that cover interface types.
2183 -- Nothing is needed either in case of virtual machines, since
2184 -- interfaces are handled directly by the VM.
2186 if not Is_Tagged_Type (Rec_Type)
2187 or else Etype (Rec_Type) = Rec_Type
2188 or else not Has_Discriminants (Etype (Rec_Type))
2189 or else not Tagged_Type_Expansion
2194 Collect_Interface_Components (Rec_Type, Ifaces_Comp_List);
2196 -- For each interface type with secondary dispatch table we generate
2197 -- the Offset_To_Top_Functions (required to displace the pointer in
2198 -- interface conversions)
2200 Iface_Comp_Elmt := First_Elmt (Ifaces_Comp_List);
2201 while Present (Iface_Comp_Elmt) loop
2202 Iface_Comp := Node (Iface_Comp_Elmt);
2203 pragma Assert (Is_Interface (Related_Type (Iface_Comp)));
2205 -- If the interface is a parent of Rec_Type it shares the primary
2206 -- dispatch table and hence there is no need to build the function
2208 if not Is_Ancestor (Related_Type (Iface_Comp), Rec_Type) then
2209 Build_Offset_To_Top_Function (Iface_Comp);
2212 Next_Elmt (Iface_Comp_Elmt);
2214 end Build_Offset_To_Top_Functions;
2216 --------------------------
2217 -- Build_Init_Procedure --
2218 --------------------------
2220 procedure Build_Init_Procedure is
2221 Body_Node : Node_Id;
2222 Handled_Stmt_Node : Node_Id;
2223 Parameters : List_Id;
2224 Proc_Spec_Node : Node_Id;
2225 Body_Stmts : List_Id;
2226 Record_Extension_Node : Node_Id;
2227 Init_Tags_List : List_Id;
2230 Body_Stmts := New_List;
2231 Body_Node := New_Node (N_Subprogram_Body, Loc);
2232 Set_Ekind (Proc_Id, E_Procedure);
2234 Proc_Spec_Node := New_Node (N_Procedure_Specification, Loc);
2235 Set_Defining_Unit_Name (Proc_Spec_Node, Proc_Id);
2237 Parameters := Init_Formals (Rec_Type);
2238 Append_List_To (Parameters,
2239 Build_Discriminant_Formals (Rec_Type, True));
2241 -- For tagged types, we add a flag to indicate whether the routine
2242 -- is called to initialize a parent component in the init_proc of
2243 -- a type extension. If the flag is false, we do not set the tag
2244 -- because it has been set already in the extension.
2246 if Is_Tagged_Type (Rec_Type)
2247 and then not Is_CPP_Class (Rec_Type)
2250 Make_Defining_Identifier (Loc,
2251 Chars => New_Internal_Name ('P'));
2253 Append_To (Parameters,
2254 Make_Parameter_Specification (Loc,
2255 Defining_Identifier => Set_Tag,
2256 Parameter_Type => New_Occurrence_Of (Standard_Boolean, Loc),
2257 Expression => New_Occurrence_Of (Standard_True, Loc)));
2260 Set_Parameter_Specifications (Proc_Spec_Node, Parameters);
2261 Set_Specification (Body_Node, Proc_Spec_Node);
2262 Set_Declarations (Body_Node, New_List);
2264 if Parent_Subtype_Renaming_Discrims then
2266 -- N is a Derived_Type_Definition that renames the parameters
2267 -- of the ancestor type. We initialize it by expanding our
2268 -- discriminants and call the ancestor _init_proc with a
2269 -- type-converted object
2271 Append_List_To (Body_Stmts,
2272 Build_Init_Call_Thru (Parameters));
2274 elsif Nkind (Type_Definition (N)) = N_Record_Definition then
2275 Build_Discriminant_Assignments (Body_Stmts);
2277 if not Null_Present (Type_Definition (N)) then
2278 Append_List_To (Body_Stmts,
2279 Build_Init_Statements (
2280 Component_List (Type_Definition (N))));
2284 -- N is a Derived_Type_Definition with a possible non-empty
2285 -- extension. The initialization of a type extension consists
2286 -- in the initialization of the components in the extension.
2288 Build_Discriminant_Assignments (Body_Stmts);
2290 Record_Extension_Node :=
2291 Record_Extension_Part (Type_Definition (N));
2293 if not Null_Present (Record_Extension_Node) then
2295 Stmts : constant List_Id :=
2296 Build_Init_Statements (
2297 Component_List (Record_Extension_Node));
2300 -- The parent field must be initialized first because
2301 -- the offset of the new discriminants may depend on it
2303 Prepend_To (Body_Stmts, Remove_Head (Stmts));
2304 Append_List_To (Body_Stmts, Stmts);
2309 -- Add here the assignment to instantiate the Tag
2311 -- The assignment corresponds to the code:
2313 -- _Init._Tag := Typ'Tag;
2315 -- Suppress the tag assignment when VM_Target because VM tags are
2316 -- represented implicitly in objects. It is also suppressed in case
2317 -- of CPP_Class types because in this case the tag is initialized in
2320 if Is_Tagged_Type (Rec_Type)
2321 and then not Is_CPP_Class (Rec_Type)
2322 and then Tagged_Type_Expansion
2323 and then not No_Run_Time_Mode
2325 -- Initialize the primary tag
2327 Init_Tags_List := New_List (
2328 Make_Assignment_Statement (Loc,
2330 Make_Selected_Component (Loc,
2331 Prefix => Make_Identifier (Loc, Name_uInit),
2333 New_Reference_To (First_Tag_Component (Rec_Type), Loc)),
2337 (Node (First_Elmt (Access_Disp_Table (Rec_Type))), Loc)));
2339 -- Generate the SCIL node associated with the initialization of
2340 -- the tag component.
2342 if Generate_SCIL then
2348 Make_SCIL_Tag_Init (Sloc (First (Init_Tags_List)));
2349 Set_SCIL_Related_Node (New_Node, First (Init_Tags_List));
2350 Set_SCIL_Entity (New_Node, Rec_Type);
2351 Prepend_To (Init_Tags_List, New_Node);
2355 -- Ada 2005 (AI-251): Initialize the secondary tags components
2356 -- located at fixed positions (tags whose position depends on
2357 -- variable size components are initialized later ---see below).
2359 if Ada_Version >= Ada_05
2360 and then not Is_Interface (Rec_Type)
2361 and then Has_Interfaces (Rec_Type)
2365 Target => Make_Identifier (Loc, Name_uInit),
2366 Stmts_List => Init_Tags_List,
2367 Fixed_Comps => True,
2368 Variable_Comps => False);
2371 -- The tag must be inserted before the assignments to other
2372 -- components, because the initial value of the component may
2373 -- depend on the tag (eg. through a dispatching operation on
2374 -- an access to the current type). The tag assignment is not done
2375 -- when initializing the parent component of a type extension,
2376 -- because in that case the tag is set in the extension.
2378 -- Extensions of imported C++ classes add a final complication,
2379 -- because we cannot inhibit tag setting in the constructor for
2380 -- the parent. In that case we insert the tag initialization
2381 -- after the calls to initialize the parent.
2383 if not Is_CPP_Class (Root_Type (Rec_Type)) then
2384 Prepend_To (Body_Stmts,
2385 Make_If_Statement (Loc,
2386 Condition => New_Occurrence_Of (Set_Tag, Loc),
2387 Then_Statements => Init_Tags_List));
2389 -- CPP_Class derivation: In this case the dispatch table of the
2390 -- parent was built in the C++ side and we copy the table of the
2391 -- parent to initialize the new dispatch table.
2398 -- We assume the first init_proc call is for the parent
2400 Nod := First (Body_Stmts);
2401 while Present (Next (Nod))
2402 and then (Nkind (Nod) /= N_Procedure_Call_Statement
2403 or else not Is_Init_Proc (Name (Nod)))
2409 -- ancestor_constructor (_init.parent);
2411 -- inherit_prim_ops (_init._tag, new_dt, num_prims);
2412 -- _init._tag := new_dt;
2415 Prepend_To (Init_Tags_List,
2416 Build_Inherit_Prims (Loc,
2419 Make_Selected_Component (Loc,
2421 Make_Identifier (Loc,
2422 Chars => Name_uInit),
2425 (First_Tag_Component (Rec_Type), Loc)),
2428 (Node (First_Elmt (Access_Disp_Table (Rec_Type))),
2432 (DT_Entry_Count (First_Tag_Component (Rec_Type)))));
2435 Make_If_Statement (Loc,
2436 Condition => New_Occurrence_Of (Set_Tag, Loc),
2437 Then_Statements => Init_Tags_List));
2439 -- We have inherited table of the parent from the CPP side.
2440 -- Now we fill the slots associated with Ada primitives.
2441 -- This needs more work to avoid its execution each time
2442 -- an object is initialized???
2449 E := First_Elmt (Primitive_Operations (Rec_Type));
2450 while Present (E) loop
2453 if not Is_Imported (Prim)
2454 and then Convention (Prim) = Convention_CPP
2455 and then not Present (Interface_Alias (Prim))
2457 Append_List_To (Init_Tags_List,
2458 Register_Primitive (Loc, Prim => Prim));
2467 -- Ada 2005 (AI-251): Initialize the secondary tag components
2468 -- located at variable positions. We delay the generation of this
2469 -- code until here because the value of the attribute 'Position
2470 -- applied to variable size components of the parent type that
2471 -- depend on discriminants is only safely read at runtime after
2472 -- the parent components have been initialized.
2474 if Ada_Version >= Ada_05
2475 and then not Is_Interface (Rec_Type)
2476 and then Has_Interfaces (Rec_Type)
2477 and then Has_Discriminants (Etype (Rec_Type))
2478 and then Is_Variable_Size_Record (Etype (Rec_Type))
2480 Init_Tags_List := New_List;
2484 Target => Make_Identifier (Loc, Name_uInit),
2485 Stmts_List => Init_Tags_List,
2486 Fixed_Comps => False,
2487 Variable_Comps => True);
2489 if Is_Non_Empty_List (Init_Tags_List) then
2490 Append_List_To (Body_Stmts, Init_Tags_List);
2495 Handled_Stmt_Node := New_Node (N_Handled_Sequence_Of_Statements, Loc);
2496 Set_Statements (Handled_Stmt_Node, Body_Stmts);
2497 Set_Exception_Handlers (Handled_Stmt_Node, No_List);
2498 Set_Handled_Statement_Sequence (Body_Node, Handled_Stmt_Node);
2500 if not Debug_Generated_Code then
2501 Set_Debug_Info_Off (Proc_Id);
2504 -- Associate Init_Proc with type, and determine if the procedure
2505 -- is null (happens because of the Initialize_Scalars pragma case,
2506 -- where we have to generate a null procedure in case it is called
2507 -- by a client with Initialize_Scalars set). Such procedures have
2508 -- to be generated, but do not have to be called, so we mark them
2509 -- as null to suppress the call.
2511 Set_Init_Proc (Rec_Type, Proc_Id);
2513 if List_Length (Body_Stmts) = 1
2515 -- We must skip SCIL nodes because they may have been added to this
2516 -- list by Insert_Actions.
2518 and then Nkind (First_Non_SCIL_Node (Body_Stmts)) = N_Null_Statement
2519 and then VM_Target = No_VM
2521 -- Even though the init proc may be null at this time it might get
2522 -- some stuff added to it later by the VM backend.
2524 Set_Is_Null_Init_Proc (Proc_Id);
2526 end Build_Init_Procedure;
2528 ---------------------------
2529 -- Build_Init_Statements --
2530 ---------------------------
2532 function Build_Init_Statements (Comp_List : Node_Id) return List_Id is
2533 Check_List : constant List_Id := New_List;
2538 Statement_List : List_Id;
2543 Per_Object_Constraint_Components : Boolean;
2545 function Has_Access_Constraint (E : Entity_Id) return Boolean;
2546 -- Components with access discriminants that depend on the current
2547 -- instance must be initialized after all other components.
2549 ---------------------------
2550 -- Has_Access_Constraint --
2551 ---------------------------
2553 function Has_Access_Constraint (E : Entity_Id) return Boolean is
2555 T : constant Entity_Id := Etype (E);
2558 if Has_Per_Object_Constraint (E)
2559 and then Has_Discriminants (T)
2561 Disc := First_Discriminant (T);
2562 while Present (Disc) loop
2563 if Is_Access_Type (Etype (Disc)) then
2567 Next_Discriminant (Disc);
2574 end Has_Access_Constraint;
2576 -- Start of processing for Build_Init_Statements
2579 if Null_Present (Comp_List) then
2580 return New_List (Make_Null_Statement (Loc));
2583 Statement_List := New_List;
2585 -- Loop through visible declarations of task types and protected
2586 -- types moving any expanded code from the spec to the body of the
2589 if Is_Task_Record_Type (Rec_Type)
2590 or else Is_Protected_Record_Type (Rec_Type)
2593 Decl : constant Node_Id :=
2594 Parent (Corresponding_Concurrent_Type (Rec_Type));
2600 if Is_Task_Record_Type (Rec_Type) then
2601 Def := Task_Definition (Decl);
2603 Def := Protected_Definition (Decl);
2606 if Present (Def) then
2607 N1 := First (Visible_Declarations (Def));
2608 while Present (N1) loop
2612 if Nkind (N2) in N_Statement_Other_Than_Procedure_Call
2613 or else Nkind (N2) in N_Raise_xxx_Error
2614 or else Nkind (N2) = N_Procedure_Call_Statement
2616 Append_To (Statement_List,
2617 New_Copy_Tree (N2, New_Scope => Proc_Id));
2618 Rewrite (N2, Make_Null_Statement (Sloc (N2)));
2626 -- Loop through components, skipping pragmas, in 2 steps. The first
2627 -- step deals with regular components. The second step deals with
2628 -- components have per object constraints, and no explicit initia-
2631 Per_Object_Constraint_Components := False;
2633 -- First step : regular components
2635 Decl := First_Non_Pragma (Component_Items (Comp_List));
2636 while Present (Decl) loop
2639 (Subtype_Indication (Component_Definition (Decl)), Check_List);
2641 Id := Defining_Identifier (Decl);
2644 if Has_Access_Constraint (Id)
2645 and then No (Expression (Decl))
2647 -- Skip processing for now and ask for a second pass
2649 Per_Object_Constraint_Components := True;
2652 -- Case of explicit initialization
2654 if Present (Expression (Decl)) then
2655 if Is_CPP_Constructor_Call (Expression (Decl)) then
2657 Build_Initialization_Call
2660 Make_Selected_Component (Loc,
2662 Make_Identifier (Loc, Name_uInit),
2663 Selector_Name => New_Occurrence_Of (Id, Loc)),
2665 In_Init_Proc => True,
2666 Enclos_Type => Rec_Type,
2667 Discr_Map => Discr_Map,
2668 Constructor_Ref => Expression (Decl));
2670 Stmts := Build_Assignment (Id, Expression (Decl));
2673 -- Case of composite component with its own Init_Proc
2675 elsif not Is_Interface (Typ)
2676 and then Has_Non_Null_Base_Init_Proc (Typ)
2679 Build_Initialization_Call
2682 Make_Selected_Component (Loc,
2683 Prefix => Make_Identifier (Loc, Name_uInit),
2684 Selector_Name => New_Occurrence_Of (Id, Loc)),
2686 In_Init_Proc => True,
2687 Enclos_Type => Rec_Type,
2688 Discr_Map => Discr_Map);
2690 Clean_Task_Names (Typ, Proc_Id);
2692 -- Case of component needing simple initialization
2694 elsif Component_Needs_Simple_Initialization (Typ) then
2697 (Id, Get_Simple_Init_Val (Typ, N, Esize (Id)));
2699 -- Nothing needed for this case
2705 if Present (Check_List) then
2706 Append_List_To (Statement_List, Check_List);
2709 if Present (Stmts) then
2711 -- Add the initialization of the record controller before
2712 -- the _Parent field is attached to it when the attachment
2713 -- can occur. It does not work to simply initialize the
2714 -- controller first: it must be initialized after the parent
2715 -- if the parent holds discriminants that can be used to
2716 -- compute the offset of the controller. We assume here that
2717 -- the last statement of the initialization call is the
2718 -- attachment of the parent (see Build_Initialization_Call)
2720 if Chars (Id) = Name_uController
2721 and then Rec_Type /= Etype (Rec_Type)
2722 and then Has_Controlled_Component (Etype (Rec_Type))
2723 and then Has_New_Controlled_Component (Rec_Type)
2724 and then Present (Last (Statement_List))
2726 Insert_List_Before (Last (Statement_List), Stmts);
2728 Append_List_To (Statement_List, Stmts);
2733 Next_Non_Pragma (Decl);
2736 -- Set up tasks and protected object support. This needs to be done
2737 -- before any component with a per-object access discriminant
2738 -- constraint, or any variant part (which may contain such
2739 -- components) is initialized, because the initialization of these
2740 -- components may reference the enclosing concurrent object.
2742 -- For a task record type, add the task create call and calls
2743 -- to bind any interrupt (signal) entries.
2745 if Is_Task_Record_Type (Rec_Type) then
2747 -- In the case of the restricted run time the ATCB has already
2748 -- been preallocated.
2750 if Restricted_Profile then
2751 Append_To (Statement_List,
2752 Make_Assignment_Statement (Loc,
2753 Name => Make_Selected_Component (Loc,
2754 Prefix => Make_Identifier (Loc, Name_uInit),
2755 Selector_Name => Make_Identifier (Loc, Name_uTask_Id)),
2756 Expression => Make_Attribute_Reference (Loc,
2758 Make_Selected_Component (Loc,
2759 Prefix => Make_Identifier (Loc, Name_uInit),
2761 Make_Identifier (Loc, Name_uATCB)),
2762 Attribute_Name => Name_Unchecked_Access)));
2765 Append_To (Statement_List, Make_Task_Create_Call (Rec_Type));
2767 -- Generate the statements which map a string entry name to a
2768 -- task entry index. Note that the task may not have entries.
2770 if Entry_Names_OK then
2771 Names := Build_Entry_Names (Rec_Type);
2773 if Present (Names) then
2774 Append_To (Statement_List, Names);
2779 Task_Type : constant Entity_Id :=
2780 Corresponding_Concurrent_Type (Rec_Type);
2781 Task_Decl : constant Node_Id := Parent (Task_Type);
2782 Task_Def : constant Node_Id := Task_Definition (Task_Decl);
2787 if Present (Task_Def) then
2788 Vis_Decl := First (Visible_Declarations (Task_Def));
2789 while Present (Vis_Decl) loop
2790 Loc := Sloc (Vis_Decl);
2792 if Nkind (Vis_Decl) = N_Attribute_Definition_Clause then
2793 if Get_Attribute_Id (Chars (Vis_Decl)) =
2796 Ent := Entity (Name (Vis_Decl));
2798 if Ekind (Ent) = E_Entry then
2799 Append_To (Statement_List,
2800 Make_Procedure_Call_Statement (Loc,
2801 Name => New_Reference_To (
2802 RTE (RE_Bind_Interrupt_To_Entry), Loc),
2803 Parameter_Associations => New_List (
2804 Make_Selected_Component (Loc,
2806 Make_Identifier (Loc, Name_uInit),
2808 Make_Identifier (Loc, Name_uTask_Id)),
2809 Entry_Index_Expression (
2810 Loc, Ent, Empty, Task_Type),
2811 Expression (Vis_Decl))));
2822 -- For a protected type, add statements generated by
2823 -- Make_Initialize_Protection.
2825 if Is_Protected_Record_Type (Rec_Type) then
2826 Append_List_To (Statement_List,
2827 Make_Initialize_Protection (Rec_Type));
2829 -- Generate the statements which map a string entry name to a
2830 -- protected entry index. Note that the protected type may not
2833 if Entry_Names_OK then
2834 Names := Build_Entry_Names (Rec_Type);
2836 if Present (Names) then
2837 Append_To (Statement_List, Names);
2842 if Per_Object_Constraint_Components then
2844 -- Second pass: components with per-object constraints
2846 Decl := First_Non_Pragma (Component_Items (Comp_List));
2847 while Present (Decl) loop
2849 Id := Defining_Identifier (Decl);
2852 if Has_Access_Constraint (Id)
2853 and then No (Expression (Decl))
2855 if Has_Non_Null_Base_Init_Proc (Typ) then
2856 Append_List_To (Statement_List,
2857 Build_Initialization_Call (Loc,
2858 Make_Selected_Component (Loc,
2859 Prefix => Make_Identifier (Loc, Name_uInit),
2860 Selector_Name => New_Occurrence_Of (Id, Loc)),
2862 In_Init_Proc => True,
2863 Enclos_Type => Rec_Type,
2864 Discr_Map => Discr_Map));
2866 Clean_Task_Names (Typ, Proc_Id);
2868 elsif Component_Needs_Simple_Initialization (Typ) then
2869 Append_List_To (Statement_List,
2871 (Id, Get_Simple_Init_Val (Typ, N, Esize (Id))));
2875 Next_Non_Pragma (Decl);
2879 -- Process the variant part
2881 if Present (Variant_Part (Comp_List)) then
2882 Alt_List := New_List;
2883 Variant := First_Non_Pragma (Variants (Variant_Part (Comp_List)));
2884 while Present (Variant) loop
2885 Loc := Sloc (Variant);
2886 Append_To (Alt_List,
2887 Make_Case_Statement_Alternative (Loc,
2889 New_Copy_List (Discrete_Choices (Variant)),
2891 Build_Init_Statements (Component_List (Variant))));
2892 Next_Non_Pragma (Variant);
2895 -- The expression of the case statement which is a reference
2896 -- to one of the discriminants is replaced by the appropriate
2897 -- formal parameter of the initialization procedure.
2899 Append_To (Statement_List,
2900 Make_Case_Statement (Loc,
2902 New_Reference_To (Discriminal (
2903 Entity (Name (Variant_Part (Comp_List)))), Loc),
2904 Alternatives => Alt_List));
2907 -- If no initializations when generated for component declarations
2908 -- corresponding to this Statement_List, append a null statement
2909 -- to the Statement_List to make it a valid Ada tree.
2911 if Is_Empty_List (Statement_List) then
2912 Append (New_Node (N_Null_Statement, Loc), Statement_List);
2915 return Statement_List;
2918 when RE_Not_Available =>
2920 end Build_Init_Statements;
2922 -------------------------
2923 -- Build_Record_Checks --
2924 -------------------------
2926 procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id) is
2927 Subtype_Mark_Id : Entity_Id;
2930 if Nkind (S) = N_Subtype_Indication then
2931 Find_Type (Subtype_Mark (S));
2932 Subtype_Mark_Id := Entity (Subtype_Mark (S));
2934 -- Remaining processing depends on type
2936 case Ekind (Subtype_Mark_Id) is
2939 Constrain_Array (S, Check_List);
2945 end Build_Record_Checks;
2947 -------------------------------------------
2948 -- Component_Needs_Simple_Initialization --
2949 -------------------------------------------
2951 function Component_Needs_Simple_Initialization
2952 (T : Entity_Id) return Boolean
2956 Needs_Simple_Initialization (T)
2957 and then not Is_RTE (T, RE_Tag)
2959 -- Ada 2005 (AI-251): Check also the tag of abstract interfaces
2961 and then not Is_RTE (T, RE_Interface_Tag);
2962 end Component_Needs_Simple_Initialization;
2964 ---------------------
2965 -- Constrain_Array --
2966 ---------------------
2968 procedure Constrain_Array
2970 Check_List : List_Id)
2972 C : constant Node_Id := Constraint (SI);
2973 Number_Of_Constraints : Nat := 0;
2978 T := Entity (Subtype_Mark (SI));
2980 if Ekind (T) in Access_Kind then
2981 T := Designated_Type (T);
2984 S := First (Constraints (C));
2986 while Present (S) loop
2987 Number_Of_Constraints := Number_Of_Constraints + 1;
2991 -- In either case, the index constraint must provide a discrete
2992 -- range for each index of the array type and the type of each
2993 -- discrete range must be the same as that of the corresponding
2994 -- index. (RM 3.6.1)
2996 S := First (Constraints (C));
2997 Index := First_Index (T);
3000 -- Apply constraints to each index type
3002 for J in 1 .. Number_Of_Constraints loop
3003 Constrain_Index (Index, S, Check_List);
3008 end Constrain_Array;
3010 ---------------------
3011 -- Constrain_Index --
3012 ---------------------
3014 procedure Constrain_Index
3017 Check_List : List_Id)
3019 T : constant Entity_Id := Etype (Index);
3022 if Nkind (S) = N_Range then
3023 Process_Range_Expr_In_Decl (S, T, Check_List);
3025 end Constrain_Index;
3027 --------------------------------------
3028 -- Parent_Subtype_Renaming_Discrims --
3029 --------------------------------------
3031 function Parent_Subtype_Renaming_Discrims return Boolean is
3036 if Base_Type (Pe) /= Pe then
3041 or else not Has_Discriminants (Pe)
3042 or else Is_Constrained (Pe)
3043 or else Is_Tagged_Type (Pe)
3048 -- If there are no explicit stored discriminants we have inherited
3049 -- the root type discriminants so far, so no renamings occurred.
3051 if First_Discriminant (Pe) = First_Stored_Discriminant (Pe) then
3055 -- Check if we have done some trivial renaming of the parent
3056 -- discriminants, i.e. something like
3058 -- type DT (X1,X2: int) is new PT (X1,X2);
3060 De := First_Discriminant (Pe);
3061 Dp := First_Discriminant (Etype (Pe));
3063 while Present (De) loop
3064 pragma Assert (Present (Dp));
3066 if Corresponding_Discriminant (De) /= Dp then
3070 Next_Discriminant (De);
3071 Next_Discriminant (Dp);
3074 return Present (Dp);
3075 end Parent_Subtype_Renaming_Discrims;
3077 ------------------------
3078 -- Requires_Init_Proc --
3079 ------------------------
3081 function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean is
3082 Comp_Decl : Node_Id;
3087 -- Definitely do not need one if specifically suppressed
3089 if Suppress_Init_Proc (Rec_Id) then
3093 -- If it is a type derived from a type with unknown discriminants,
3094 -- we cannot build an initialization procedure for it.
3096 if Has_Unknown_Discriminants (Rec_Id)
3097 or else Has_Unknown_Discriminants (Etype (Rec_Id))
3102 -- Otherwise we need to generate an initialization procedure if
3103 -- Is_CPP_Class is False and at least one of the following applies:
3105 -- 1. Discriminants are present, since they need to be initialized
3106 -- with the appropriate discriminant constraint expressions.
3107 -- However, the discriminant of an unchecked union does not
3108 -- count, since the discriminant is not present.
3110 -- 2. The type is a tagged type, since the implicit Tag component
3111 -- needs to be initialized with a pointer to the dispatch table.
3113 -- 3. The type contains tasks
3115 -- 4. One or more components has an initial value
3117 -- 5. One or more components is for a type which itself requires
3118 -- an initialization procedure.
3120 -- 6. One or more components is a type that requires simple
3121 -- initialization (see Needs_Simple_Initialization), except
3122 -- that types Tag and Interface_Tag are excluded, since fields
3123 -- of these types are initialized by other means.
3125 -- 7. The type is the record type built for a task type (since at
3126 -- the very least, Create_Task must be called)
3128 -- 8. The type is the record type built for a protected type (since
3129 -- at least Initialize_Protection must be called)
3131 -- 9. The type is marked as a public entity. The reason we add this
3132 -- case (even if none of the above apply) is to properly handle
3133 -- Initialize_Scalars. If a package is compiled without an IS
3134 -- pragma, and the client is compiled with an IS pragma, then
3135 -- the client will think an initialization procedure is present
3136 -- and call it, when in fact no such procedure is required, but
3137 -- since the call is generated, there had better be a routine
3138 -- at the other end of the call, even if it does nothing!)
3140 -- Note: the reason we exclude the CPP_Class case is because in this
3141 -- case the initialization is performed in the C++ side.
3143 if Is_CPP_Class (Rec_Id) then
3146 elsif Is_Interface (Rec_Id) then
3149 elsif (Has_Discriminants (Rec_Id)
3150 and then not Is_Unchecked_Union (Rec_Id))
3151 or else Is_Tagged_Type (Rec_Id)
3152 or else Is_Concurrent_Record_Type (Rec_Id)
3153 or else Has_Task (Rec_Id)
3158 Id := First_Component (Rec_Id);
3159 while Present (Id) loop
3160 Comp_Decl := Parent (Id);
3163 if Present (Expression (Comp_Decl))
3164 or else Has_Non_Null_Base_Init_Proc (Typ)
3165 or else Component_Needs_Simple_Initialization (Typ)
3170 Next_Component (Id);
3173 -- As explained above, a record initialization procedure is needed
3174 -- for public types in case Initialize_Scalars applies to a client.
3175 -- However, such a procedure is not needed in the case where either
3176 -- of restrictions No_Initialize_Scalars or No_Default_Initialization
3177 -- applies. No_Initialize_Scalars excludes the possibility of using
3178 -- Initialize_Scalars in any partition, and No_Default_Initialization
3179 -- implies that no initialization should ever be done for objects of
3180 -- the type, so is incompatible with Initialize_Scalars.
3182 if not Restriction_Active (No_Initialize_Scalars)
3183 and then not Restriction_Active (No_Default_Initialization)
3184 and then Is_Public (Rec_Id)
3190 end Requires_Init_Proc;
3192 -- Start of processing for Build_Record_Init_Proc
3195 -- Check for value type, which means no initialization required
3197 Rec_Type := Defining_Identifier (N);
3199 if Is_Value_Type (Rec_Type) then
3203 -- This may be full declaration of a private type, in which case
3204 -- the visible entity is a record, and the private entity has been
3205 -- exchanged with it in the private part of the current package.
3206 -- The initialization procedure is built for the record type, which
3207 -- is retrievable from the private entity.
3209 if Is_Incomplete_Or_Private_Type (Rec_Type) then
3210 Rec_Type := Underlying_Type (Rec_Type);
3213 -- If there are discriminants, build the discriminant map to replace
3214 -- discriminants by their discriminals in complex bound expressions.
3215 -- These only arise for the corresponding records of synchronized types.
3217 if Is_Concurrent_Record_Type (Rec_Type)
3218 and then Has_Discriminants (Rec_Type)
3223 Disc := First_Discriminant (Rec_Type);
3224 while Present (Disc) loop
3225 Append_Elmt (Disc, Discr_Map);
3226 Append_Elmt (Discriminal (Disc), Discr_Map);
3227 Next_Discriminant (Disc);
3232 -- Derived types that have no type extension can use the initialization
3233 -- procedure of their parent and do not need a procedure of their own.
3234 -- This is only correct if there are no representation clauses for the
3235 -- type or its parent, and if the parent has in fact been frozen so
3236 -- that its initialization procedure exists.
3238 if Is_Derived_Type (Rec_Type)
3239 and then not Is_Tagged_Type (Rec_Type)
3240 and then not Is_Unchecked_Union (Rec_Type)
3241 and then not Has_New_Non_Standard_Rep (Rec_Type)
3242 and then not Parent_Subtype_Renaming_Discrims
3243 and then Has_Non_Null_Base_Init_Proc (Etype (Rec_Type))
3245 Copy_TSS (Base_Init_Proc (Etype (Rec_Type)), Rec_Type);
3247 -- Otherwise if we need an initialization procedure, then build one,
3248 -- mark it as public and inlinable and as having a completion.
3250 elsif Requires_Init_Proc (Rec_Type)
3251 or else Is_Unchecked_Union (Rec_Type)
3254 Make_Defining_Identifier (Loc,
3255 Chars => Make_Init_Proc_Name (Rec_Type));
3257 -- If No_Default_Initialization restriction is active, then we don't
3258 -- want to build an init_proc, but we need to mark that an init_proc
3259 -- would be needed if this restriction was not active (so that we can
3260 -- detect attempts to call it), so set a dummy init_proc in place.
3262 if Restriction_Active (No_Default_Initialization) then
3263 Set_Init_Proc (Rec_Type, Proc_Id);
3267 Build_Offset_To_Top_Functions;
3268 Build_Init_Procedure;
3269 Set_Is_Public (Proc_Id, Is_Public (Pe));
3271 -- The initialization of protected records is not worth inlining.
3272 -- In addition, when compiled for another unit for inlining purposes,
3273 -- it may make reference to entities that have not been elaborated
3274 -- yet. The initialization of controlled records contains a nested
3275 -- clean-up procedure that makes it impractical to inline as well,
3276 -- and leads to undefined symbols if inlined in a different unit.
3277 -- Similar considerations apply to task types.
3279 if not Is_Concurrent_Type (Rec_Type)
3280 and then not Has_Task (Rec_Type)
3281 and then not Needs_Finalization (Rec_Type)
3283 Set_Is_Inlined (Proc_Id);
3286 Set_Is_Internal (Proc_Id);
3287 Set_Has_Completion (Proc_Id);
3289 if not Debug_Generated_Code then
3290 Set_Debug_Info_Off (Proc_Id);
3294 Agg : constant Node_Id :=
3295 Build_Equivalent_Record_Aggregate (Rec_Type);
3297 procedure Collect_Itypes (Comp : Node_Id);
3298 -- Generate references to itypes in the aggregate, because
3299 -- the first use of the aggregate may be in a nested scope.
3301 --------------------
3302 -- Collect_Itypes --
3303 --------------------
3305 procedure Collect_Itypes (Comp : Node_Id) is
3308 Typ : constant Entity_Id := Etype (Comp);
3311 if Is_Array_Type (Typ)
3312 and then Is_Itype (Typ)
3314 Ref := Make_Itype_Reference (Loc);
3315 Set_Itype (Ref, Typ);
3316 Append_Freeze_Action (Rec_Type, Ref);
3318 Ref := Make_Itype_Reference (Loc);
3319 Set_Itype (Ref, Etype (First_Index (Typ)));
3320 Append_Freeze_Action (Rec_Type, Ref);
3322 Sub_Aggr := First (Expressions (Comp));
3324 -- Recurse on nested arrays
3326 while Present (Sub_Aggr) loop
3327 Collect_Itypes (Sub_Aggr);
3334 -- If there is a static initialization aggregate for the type,
3335 -- generate itype references for the types of its (sub)components,
3336 -- to prevent out-of-scope errors in the resulting tree.
3337 -- The aggregate may have been rewritten as a Raise node, in which
3338 -- case there are no relevant itypes.
3341 and then Nkind (Agg) = N_Aggregate
3343 Set_Static_Initialization (Proc_Id, Agg);
3348 Comp := First (Component_Associations (Agg));
3349 while Present (Comp) loop
3350 Collect_Itypes (Expression (Comp));
3357 end Build_Record_Init_Proc;
3359 ----------------------------
3360 -- Build_Slice_Assignment --
3361 ----------------------------
3363 -- Generates the following subprogram:
3366 -- (Source, Target : Array_Type,
3367 -- Left_Lo, Left_Hi : Index;
3368 -- Right_Lo, Right_Hi : Index;
3376 -- if Left_Hi < Left_Lo then
3389 -- Target (Li1) := Source (Ri1);
3392 -- exit when Li1 = Left_Lo;
3393 -- Li1 := Index'pred (Li1);
3394 -- Ri1 := Index'pred (Ri1);
3396 -- exit when Li1 = Left_Hi;
3397 -- Li1 := Index'succ (Li1);
3398 -- Ri1 := Index'succ (Ri1);
3403 procedure Build_Slice_Assignment (Typ : Entity_Id) is
3404 Loc : constant Source_Ptr := Sloc (Typ);
3405 Index : constant Entity_Id := Base_Type (Etype (First_Index (Typ)));
3407 -- Build formal parameters of procedure
3409 Larray : constant Entity_Id :=
3410 Make_Defining_Identifier
3411 (Loc, Chars => New_Internal_Name ('A'));
3412 Rarray : constant Entity_Id :=
3413 Make_Defining_Identifier
3414 (Loc, Chars => New_Internal_Name ('R'));
3415 Left_Lo : constant Entity_Id :=
3416 Make_Defining_Identifier
3417 (Loc, Chars => New_Internal_Name ('L'));
3418 Left_Hi : constant Entity_Id :=
3419 Make_Defining_Identifier
3420 (Loc, Chars => New_Internal_Name ('L'));
3421 Right_Lo : constant Entity_Id :=
3422 Make_Defining_Identifier
3423 (Loc, Chars => New_Internal_Name ('R'));
3424 Right_Hi : constant Entity_Id :=
3425 Make_Defining_Identifier
3426 (Loc, Chars => New_Internal_Name ('R'));
3427 Rev : constant Entity_Id :=
3428 Make_Defining_Identifier
3429 (Loc, Chars => New_Internal_Name ('D'));
3430 Proc_Name : constant Entity_Id :=
3431 Make_Defining_Identifier (Loc,
3432 Chars => Make_TSS_Name (Typ, TSS_Slice_Assign));
3434 Lnn : constant Entity_Id :=
3435 Make_Defining_Identifier (Loc, New_Internal_Name ('L'));
3436 Rnn : constant Entity_Id :=
3437 Make_Defining_Identifier (Loc, New_Internal_Name ('R'));
3438 -- Subscripts for left and right sides
3445 -- Build declarations for indices
3450 Make_Object_Declaration (Loc,
3451 Defining_Identifier => Lnn,
3452 Object_Definition =>
3453 New_Occurrence_Of (Index, Loc)));
3456 Make_Object_Declaration (Loc,
3457 Defining_Identifier => Rnn,
3458 Object_Definition =>
3459 New_Occurrence_Of (Index, Loc)));
3463 -- Build test for empty slice case
3466 Make_If_Statement (Loc,
3469 Left_Opnd => New_Occurrence_Of (Left_Hi, Loc),
3470 Right_Opnd => New_Occurrence_Of (Left_Lo, Loc)),
3471 Then_Statements => New_List (Make_Simple_Return_Statement (Loc))));
3473 -- Build initializations for indices
3476 F_Init : constant List_Id := New_List;
3477 B_Init : constant List_Id := New_List;
3481 Make_Assignment_Statement (Loc,
3482 Name => New_Occurrence_Of (Lnn, Loc),
3483 Expression => New_Occurrence_Of (Left_Lo, Loc)));
3486 Make_Assignment_Statement (Loc,
3487 Name => New_Occurrence_Of (Rnn, Loc),
3488 Expression => New_Occurrence_Of (Right_Lo, Loc)));
3491 Make_Assignment_Statement (Loc,
3492 Name => New_Occurrence_Of (Lnn, Loc),
3493 Expression => New_Occurrence_Of (Left_Hi, Loc)));
3496 Make_Assignment_Statement (Loc,
3497 Name => New_Occurrence_Of (Rnn, Loc),
3498 Expression => New_Occurrence_Of (Right_Hi, Loc)));
3501 Make_If_Statement (Loc,
3502 Condition => New_Occurrence_Of (Rev, Loc),
3503 Then_Statements => B_Init,
3504 Else_Statements => F_Init));
3507 -- Now construct the assignment statement
3510 Make_Loop_Statement (Loc,
3511 Statements => New_List (
3512 Make_Assignment_Statement (Loc,
3514 Make_Indexed_Component (Loc,
3515 Prefix => New_Occurrence_Of (Larray, Loc),
3516 Expressions => New_List (New_Occurrence_Of (Lnn, Loc))),
3518 Make_Indexed_Component (Loc,
3519 Prefix => New_Occurrence_Of (Rarray, Loc),
3520 Expressions => New_List (New_Occurrence_Of (Rnn, Loc))))),
3521 End_Label => Empty);
3523 -- Build the exit condition and increment/decrement statements
3526 F_Ass : constant List_Id := New_List;
3527 B_Ass : constant List_Id := New_List;
3531 Make_Exit_Statement (Loc,
3534 Left_Opnd => New_Occurrence_Of (Lnn, Loc),
3535 Right_Opnd => New_Occurrence_Of (Left_Hi, Loc))));
3538 Make_Assignment_Statement (Loc,
3539 Name => New_Occurrence_Of (Lnn, Loc),
3541 Make_Attribute_Reference (Loc,
3543 New_Occurrence_Of (Index, Loc),
3544 Attribute_Name => Name_Succ,
3545 Expressions => New_List (
3546 New_Occurrence_Of (Lnn, Loc)))));
3549 Make_Assignment_Statement (Loc,
3550 Name => New_Occurrence_Of (Rnn, Loc),
3552 Make_Attribute_Reference (Loc,
3554 New_Occurrence_Of (Index, Loc),
3555 Attribute_Name => Name_Succ,
3556 Expressions => New_List (
3557 New_Occurrence_Of (Rnn, Loc)))));
3560 Make_Exit_Statement (Loc,
3563 Left_Opnd => New_Occurrence_Of (Lnn, Loc),
3564 Right_Opnd => New_Occurrence_Of (Left_Lo, Loc))));
3567 Make_Assignment_Statement (Loc,
3568 Name => New_Occurrence_Of (Lnn, Loc),
3570 Make_Attribute_Reference (Loc,
3572 New_Occurrence_Of (Index, Loc),
3573 Attribute_Name => Name_Pred,
3574 Expressions => New_List (
3575 New_Occurrence_Of (Lnn, Loc)))));
3578 Make_Assignment_Statement (Loc,
3579 Name => New_Occurrence_Of (Rnn, Loc),
3581 Make_Attribute_Reference (Loc,
3583 New_Occurrence_Of (Index, Loc),
3584 Attribute_Name => Name_Pred,
3585 Expressions => New_List (
3586 New_Occurrence_Of (Rnn, Loc)))));
3588 Append_To (Statements (Loops),
3589 Make_If_Statement (Loc,
3590 Condition => New_Occurrence_Of (Rev, Loc),
3591 Then_Statements => B_Ass,
3592 Else_Statements => F_Ass));
3595 Append_To (Stats, Loops);
3599 Formals : List_Id := New_List;
3602 Formals := New_List (
3603 Make_Parameter_Specification (Loc,
3604 Defining_Identifier => Larray,
3605 Out_Present => True,
3607 New_Reference_To (Base_Type (Typ), Loc)),
3609 Make_Parameter_Specification (Loc,
3610 Defining_Identifier => Rarray,
3612 New_Reference_To (Base_Type (Typ), Loc)),
3614 Make_Parameter_Specification (Loc,
3615 Defining_Identifier => Left_Lo,
3617 New_Reference_To (Index, Loc)),
3619 Make_Parameter_Specification (Loc,
3620 Defining_Identifier => Left_Hi,
3622 New_Reference_To (Index, Loc)),
3624 Make_Parameter_Specification (Loc,
3625 Defining_Identifier => Right_Lo,
3627 New_Reference_To (Index, Loc)),
3629 Make_Parameter_Specification (Loc,
3630 Defining_Identifier => Right_Hi,
3632 New_Reference_To (Index, Loc)));
3635 Make_Parameter_Specification (Loc,
3636 Defining_Identifier => Rev,
3638 New_Reference_To (Standard_Boolean, Loc)));
3641 Make_Procedure_Specification (Loc,
3642 Defining_Unit_Name => Proc_Name,
3643 Parameter_Specifications => Formals);
3646 Make_Subprogram_Body (Loc,
3647 Specification => Spec,
3648 Declarations => Decls,
3649 Handled_Statement_Sequence =>
3650 Make_Handled_Sequence_Of_Statements (Loc,
3651 Statements => Stats)));
3654 Set_TSS (Typ, Proc_Name);
3655 Set_Is_Pure (Proc_Name);
3656 end Build_Slice_Assignment;
3658 ------------------------------------
3659 -- Build_Variant_Record_Equality --
3660 ------------------------------------
3664 -- function _Equality (X, Y : T) return Boolean is
3666 -- -- Compare discriminants
3668 -- if False or else X.D1 /= Y.D1 or else X.D2 /= Y.D2 then
3672 -- -- Compare components
3674 -- if False or else X.C1 /= Y.C1 or else X.C2 /= Y.C2 then
3678 -- -- Compare variant part
3682 -- if False or else X.C2 /= Y.C2 or else X.C3 /= Y.C3 then
3687 -- if False or else X.Cn /= Y.Cn then
3695 procedure Build_Variant_Record_Equality (Typ : Entity_Id) is
3696 Loc : constant Source_Ptr := Sloc (Typ);
3698 F : constant Entity_Id :=
3699 Make_Defining_Identifier (Loc,
3700 Chars => Make_TSS_Name (Typ, TSS_Composite_Equality));
3702 X : constant Entity_Id :=
3703 Make_Defining_Identifier (Loc,
3706 Y : constant Entity_Id :=
3707 Make_Defining_Identifier (Loc,
3710 Def : constant Node_Id := Parent (Typ);
3711 Comps : constant Node_Id := Component_List (Type_Definition (Def));
3712 Stmts : constant List_Id := New_List;
3713 Pspecs : constant List_Id := New_List;
3716 -- Derived Unchecked_Union types no longer inherit the equality function
3719 if Is_Derived_Type (Typ)
3720 and then not Is_Unchecked_Union (Typ)
3721 and then not Has_New_Non_Standard_Rep (Typ)
3724 Parent_Eq : constant Entity_Id :=
3725 TSS (Root_Type (Typ), TSS_Composite_Equality);
3728 if Present (Parent_Eq) then
3729 Copy_TSS (Parent_Eq, Typ);
3736 Make_Subprogram_Body (Loc,
3738 Make_Function_Specification (Loc,
3739 Defining_Unit_Name => F,
3740 Parameter_Specifications => Pspecs,
3741 Result_Definition => New_Reference_To (Standard_Boolean, Loc)),
3742 Declarations => New_List,
3743 Handled_Statement_Sequence =>
3744 Make_Handled_Sequence_Of_Statements (Loc,
3745 Statements => Stmts)));
3748 Make_Parameter_Specification (Loc,
3749 Defining_Identifier => X,
3750 Parameter_Type => New_Reference_To (Typ, Loc)));
3753 Make_Parameter_Specification (Loc,
3754 Defining_Identifier => Y,
3755 Parameter_Type => New_Reference_To (Typ, Loc)));
3757 -- Unchecked_Unions require additional machinery to support equality.
3758 -- Two extra parameters (A and B) are added to the equality function
3759 -- parameter list in order to capture the inferred values of the
3760 -- discriminants in later calls.
3762 if Is_Unchecked_Union (Typ) then
3764 Discr_Type : constant Node_Id := Etype (First_Discriminant (Typ));
3766 A : constant Node_Id :=
3767 Make_Defining_Identifier (Loc,
3770 B : constant Node_Id :=
3771 Make_Defining_Identifier (Loc,
3775 -- Add A and B to the parameter list
3778 Make_Parameter_Specification (Loc,
3779 Defining_Identifier => A,
3780 Parameter_Type => New_Reference_To (Discr_Type, Loc)));
3783 Make_Parameter_Specification (Loc,
3784 Defining_Identifier => B,
3785 Parameter_Type => New_Reference_To (Discr_Type, Loc)));
3787 -- Generate the following header code to compare the inferred
3795 Make_If_Statement (Loc,
3798 Left_Opnd => New_Reference_To (A, Loc),
3799 Right_Opnd => New_Reference_To (B, Loc)),
3800 Then_Statements => New_List (
3801 Make_Simple_Return_Statement (Loc,
3802 Expression => New_Occurrence_Of (Standard_False, Loc)))));
3804 -- Generate component-by-component comparison. Note that we must
3805 -- propagate one of the inferred discriminant formals to act as
3806 -- the case statement switch.
3808 Append_List_To (Stmts,
3809 Make_Eq_Case (Typ, Comps, A));
3813 -- Normal case (not unchecked union)
3818 Discriminant_Specifications (Def)));
3820 Append_List_To (Stmts,
3821 Make_Eq_Case (Typ, Comps));
3825 Make_Simple_Return_Statement (Loc,
3826 Expression => New_Reference_To (Standard_True, Loc)));
3831 if not Debug_Generated_Code then
3832 Set_Debug_Info_Off (F);
3834 end Build_Variant_Record_Equality;
3836 -----------------------------
3837 -- Check_Stream_Attributes --
3838 -----------------------------
3840 procedure Check_Stream_Attributes (Typ : Entity_Id) is
3842 Par_Read : constant Boolean :=
3843 Stream_Attribute_Available (Typ, TSS_Stream_Read)
3844 and then not Has_Specified_Stream_Read (Typ);
3845 Par_Write : constant Boolean :=
3846 Stream_Attribute_Available (Typ, TSS_Stream_Write)
3847 and then not Has_Specified_Stream_Write (Typ);
3849 procedure Check_Attr (Nam : Name_Id; TSS_Nam : TSS_Name_Type);
3850 -- Check that Comp has a user-specified Nam stream attribute
3856 procedure Check_Attr (Nam : Name_Id; TSS_Nam : TSS_Name_Type) is
3858 if not Stream_Attribute_Available (Etype (Comp), TSS_Nam) then
3859 Error_Msg_Name_1 := Nam;
3861 ("|component& in limited extension must have% attribute", Comp);
3865 -- Start of processing for Check_Stream_Attributes
3868 if Par_Read or else Par_Write then
3869 Comp := First_Component (Typ);
3870 while Present (Comp) loop
3871 if Comes_From_Source (Comp)
3872 and then Original_Record_Component (Comp) = Comp
3873 and then Is_Limited_Type (Etype (Comp))
3876 Check_Attr (Name_Read, TSS_Stream_Read);
3880 Check_Attr (Name_Write, TSS_Stream_Write);
3884 Next_Component (Comp);
3887 end Check_Stream_Attributes;
3889 -----------------------------
3890 -- Expand_Record_Extension --
3891 -----------------------------
3893 -- Add a field _parent at the beginning of the record extension. This is
3894 -- used to implement inheritance. Here are some examples of expansion:
3896 -- 1. no discriminants
3897 -- type T2 is new T1 with null record;
3899 -- type T2 is new T1 with record
3903 -- 2. renamed discriminants
3904 -- type T2 (B, C : Int) is new T1 (A => B) with record
3905 -- _Parent : T1 (A => B);
3909 -- 3. inherited discriminants
3910 -- type T2 is new T1 with record -- discriminant A inherited
3911 -- _Parent : T1 (A);
3915 procedure Expand_Record_Extension (T : Entity_Id; Def : Node_Id) is
3916 Indic : constant Node_Id := Subtype_Indication (Def);
3917 Loc : constant Source_Ptr := Sloc (Def);
3918 Rec_Ext_Part : Node_Id := Record_Extension_Part (Def);
3919 Par_Subtype : Entity_Id;
3920 Comp_List : Node_Id;
3921 Comp_Decl : Node_Id;
3924 List_Constr : constant List_Id := New_List;
3927 -- Expand_Record_Extension is called directly from the semantics, so
3928 -- we must check to see whether expansion is active before proceeding
3930 if not Expander_Active then
3934 -- This may be a derivation of an untagged private type whose full
3935 -- view is tagged, in which case the Derived_Type_Definition has no
3936 -- extension part. Build an empty one now.
3938 if No (Rec_Ext_Part) then
3940 Make_Record_Definition (Loc,
3942 Component_List => Empty,
3943 Null_Present => True);
3945 Set_Record_Extension_Part (Def, Rec_Ext_Part);
3946 Mark_Rewrite_Insertion (Rec_Ext_Part);
3949 Comp_List := Component_List (Rec_Ext_Part);
3951 Parent_N := Make_Defining_Identifier (Loc, Name_uParent);
3953 -- If the derived type inherits its discriminants the type of the
3954 -- _parent field must be constrained by the inherited discriminants
3956 if Has_Discriminants (T)
3957 and then Nkind (Indic) /= N_Subtype_Indication
3958 and then not Is_Constrained (Entity (Indic))
3960 D := First_Discriminant (T);
3961 while Present (D) loop
3962 Append_To (List_Constr, New_Occurrence_Of (D, Loc));
3963 Next_Discriminant (D);
3968 Make_Subtype_Indication (Loc,
3969 Subtype_Mark => New_Reference_To (Entity (Indic), Loc),
3971 Make_Index_Or_Discriminant_Constraint (Loc,
3972 Constraints => List_Constr)),
3975 -- Otherwise the original subtype_indication is just what is needed
3978 Par_Subtype := Process_Subtype (New_Copy_Tree (Indic), Def);
3981 Set_Parent_Subtype (T, Par_Subtype);
3984 Make_Component_Declaration (Loc,
3985 Defining_Identifier => Parent_N,
3986 Component_Definition =>
3987 Make_Component_Definition (Loc,
3988 Aliased_Present => False,
3989 Subtype_Indication => New_Reference_To (Par_Subtype, Loc)));
3991 if Null_Present (Rec_Ext_Part) then
3992 Set_Component_List (Rec_Ext_Part,
3993 Make_Component_List (Loc,
3994 Component_Items => New_List (Comp_Decl),
3995 Variant_Part => Empty,
3996 Null_Present => False));
3997 Set_Null_Present (Rec_Ext_Part, False);
3999 elsif Null_Present (Comp_List)
4000 or else Is_Empty_List (Component_Items (Comp_List))
4002 Set_Component_Items (Comp_List, New_List (Comp_Decl));
4003 Set_Null_Present (Comp_List, False);
4006 Insert_Before (First (Component_Items (Comp_List)), Comp_Decl);
4009 Analyze (Comp_Decl);
4010 end Expand_Record_Extension;
4012 ------------------------------------
4013 -- Expand_N_Full_Type_Declaration --
4014 ------------------------------------
4016 procedure Expand_N_Full_Type_Declaration (N : Node_Id) is
4017 Def_Id : constant Entity_Id := Defining_Identifier (N);
4018 B_Id : constant Entity_Id := Base_Type (Def_Id);
4022 procedure Build_Master (Def_Id : Entity_Id);
4023 -- Create the master associated with Def_Id
4029 procedure Build_Master (Def_Id : Entity_Id) is
4031 -- Anonymous access types are created for the components of the
4032 -- record parameter for an entry declaration. No master is created
4035 if Has_Task (Designated_Type (Def_Id))
4036 and then Comes_From_Source (N)
4038 Build_Master_Entity (Def_Id);
4039 Build_Master_Renaming (Parent (Def_Id), Def_Id);
4041 -- Create a class-wide master because a Master_Id must be generated
4042 -- for access-to-limited-class-wide types whose root may be extended
4043 -- with task components.
4045 -- Note: This code covers access-to-limited-interfaces because they
4046 -- can be used to reference tasks implementing them.
4048 elsif Is_Class_Wide_Type (Designated_Type (Def_Id))
4049 and then Is_Limited_Type (Designated_Type (Def_Id))
4050 and then Tasking_Allowed
4052 -- Do not create a class-wide master for types whose convention is
4053 -- Java since these types cannot embed Ada tasks anyway. Note that
4054 -- the following test cannot catch the following case:
4056 -- package java.lang.Object is
4057 -- type Typ is tagged limited private;
4058 -- type Ref is access all Typ'Class;
4060 -- type Typ is tagged limited ...;
4061 -- pragma Convention (Typ, Java)
4064 -- Because the convention appears after we have done the
4065 -- processing for type Ref.
4067 and then Convention (Designated_Type (Def_Id)) /= Convention_Java
4068 and then Convention (Designated_Type (Def_Id)) /= Convention_CIL
4070 Build_Class_Wide_Master (Def_Id);
4074 -- Start of processing for Expand_N_Full_Type_Declaration
4077 if Is_Access_Type (Def_Id) then
4078 Build_Master (Def_Id);
4080 if Ekind (Def_Id) = E_Access_Protected_Subprogram_Type then
4081 Expand_Access_Protected_Subprogram_Type (N);
4084 elsif Ada_Version >= Ada_05
4085 and then Is_Array_Type (Def_Id)
4086 and then Is_Access_Type (Component_Type (Def_Id))
4087 and then Ekind (Component_Type (Def_Id)) = E_Anonymous_Access_Type
4089 Build_Master (Component_Type (Def_Id));
4091 elsif Has_Task (Def_Id) then
4092 Expand_Previous_Access_Type (Def_Id);
4094 elsif Ada_Version >= Ada_05
4096 (Is_Record_Type (Def_Id)
4097 or else (Is_Array_Type (Def_Id)
4098 and then Is_Record_Type (Component_Type (Def_Id))))
4106 -- Look for the first anonymous access type component
4108 if Is_Array_Type (Def_Id) then
4109 Comp := First_Entity (Component_Type (Def_Id));
4111 Comp := First_Entity (Def_Id);
4114 while Present (Comp) loop
4115 Typ := Etype (Comp);
4117 exit when Is_Access_Type (Typ)
4118 and then Ekind (Typ) = E_Anonymous_Access_Type;
4123 -- If found we add a renaming declaration of master_id and we
4124 -- associate it to each anonymous access type component. Do
4125 -- nothing if the access type already has a master. This will be
4126 -- the case if the array type is the packed array created for a
4127 -- user-defined array type T, where the master_id is created when
4128 -- expanding the declaration for T.
4131 and then Ekind (Typ) = E_Anonymous_Access_Type
4132 and then not Restriction_Active (No_Task_Hierarchy)
4133 and then No (Master_Id (Typ))
4135 -- Do not consider run-times with no tasking support
4137 and then RTE_Available (RE_Current_Master)
4138 and then Has_Task (Non_Limited_Designated_Type (Typ))
4140 Build_Master_Entity (Def_Id);
4141 M_Id := Build_Master_Renaming (N, Def_Id);
4143 if Is_Array_Type (Def_Id) then
4144 Comp := First_Entity (Component_Type (Def_Id));
4146 Comp := First_Entity (Def_Id);
4149 while Present (Comp) loop
4150 Typ := Etype (Comp);
4152 if Is_Access_Type (Typ)
4153 and then Ekind (Typ) = E_Anonymous_Access_Type
4155 Set_Master_Id (Typ, M_Id);
4164 Par_Id := Etype (B_Id);
4166 -- The parent type is private then we need to inherit any TSS operations
4167 -- from the full view.
4169 if Ekind (Par_Id) in Private_Kind
4170 and then Present (Full_View (Par_Id))
4172 Par_Id := Base_Type (Full_View (Par_Id));
4175 if Nkind (Type_Definition (Original_Node (N))) =
4176 N_Derived_Type_Definition
4177 and then not Is_Tagged_Type (Def_Id)
4178 and then Present (Freeze_Node (Par_Id))
4179 and then Present (TSS_Elist (Freeze_Node (Par_Id)))
4181 Ensure_Freeze_Node (B_Id);
4182 FN := Freeze_Node (B_Id);
4184 if No (TSS_Elist (FN)) then
4185 Set_TSS_Elist (FN, New_Elmt_List);
4189 T_E : constant Elist_Id := TSS_Elist (FN);
4193 Elmt := First_Elmt (TSS_Elist (Freeze_Node (Par_Id)));
4194 while Present (Elmt) loop
4195 if Chars (Node (Elmt)) /= Name_uInit then
4196 Append_Elmt (Node (Elmt), T_E);
4202 -- If the derived type itself is private with a full view, then
4203 -- associate the full view with the inherited TSS_Elist as well.
4205 if Ekind (B_Id) in Private_Kind
4206 and then Present (Full_View (B_Id))
4208 Ensure_Freeze_Node (Base_Type (Full_View (B_Id)));
4210 (Freeze_Node (Base_Type (Full_View (B_Id))), TSS_Elist (FN));
4214 end Expand_N_Full_Type_Declaration;
4216 ---------------------------------
4217 -- Expand_N_Object_Declaration --
4218 ---------------------------------
4220 -- First we do special processing for objects of a tagged type where this
4221 -- is the point at which the type is frozen. The creation of the dispatch
4222 -- table and the initialization procedure have to be deferred to this
4223 -- point, since we reference previously declared primitive subprograms.
4225 -- For all types, we call an initialization procedure if there is one
4227 procedure Expand_N_Object_Declaration (N : Node_Id) is
4228 Def_Id : constant Entity_Id := Defining_Identifier (N);
4229 Expr : constant Node_Id := Expression (N);
4230 Loc : constant Source_Ptr := Sloc (N);
4231 Typ : constant Entity_Id := Etype (Def_Id);
4232 Base_Typ : constant Entity_Id := Base_Type (Typ);
4237 Init_After : Node_Id := N;
4238 -- Node after which the init proc call is to be inserted. This is
4239 -- normally N, except for the case of a shared passive variable, in
4240 -- which case the init proc call must be inserted only after the bodies
4241 -- of the shared variable procedures have been seen.
4243 function Rewrite_As_Renaming return Boolean;
4244 -- Indicate whether to rewrite a declaration with initialization into an
4245 -- object renaming declaration (see below).
4247 -------------------------
4248 -- Rewrite_As_Renaming --
4249 -------------------------
4251 function Rewrite_As_Renaming return Boolean is
4253 return not Aliased_Present (N)
4254 and then Is_Entity_Name (Expr_Q)
4255 and then Ekind (Entity (Expr_Q)) = E_Variable
4256 and then OK_To_Rename (Entity (Expr_Q))
4257 and then Is_Entity_Name (Object_Definition (N));
4258 end Rewrite_As_Renaming;
4260 -- Start of processing for Expand_N_Object_Declaration
4263 -- Don't do anything for deferred constants. All proper actions will be
4264 -- expanded during the full declaration.
4266 if No (Expr) and Constant_Present (N) then
4270 -- Force construction of dispatch tables of library level tagged types
4272 if Tagged_Type_Expansion
4273 and then Static_Dispatch_Tables
4274 and then Is_Library_Level_Entity (Def_Id)
4275 and then Is_Library_Level_Tagged_Type (Base_Typ)
4276 and then (Ekind (Base_Typ) = E_Record_Type
4277 or else Ekind (Base_Typ) = E_Protected_Type
4278 or else Ekind (Base_Typ) = E_Task_Type)
4279 and then not Has_Dispatch_Table (Base_Typ)
4282 New_Nodes : List_Id := No_List;
4285 if Is_Concurrent_Type (Base_Typ) then
4286 New_Nodes := Make_DT (Corresponding_Record_Type (Base_Typ), N);
4288 New_Nodes := Make_DT (Base_Typ, N);
4291 if not Is_Empty_List (New_Nodes) then
4292 Insert_List_Before (N, New_Nodes);
4297 -- Make shared memory routines for shared passive variable
4299 if Is_Shared_Passive (Def_Id) then
4300 Init_After := Make_Shared_Var_Procs (N);
4303 -- If tasks being declared, make sure we have an activation chain
4304 -- defined for the tasks (has no effect if we already have one), and
4305 -- also that a Master variable is established and that the appropriate
4306 -- enclosing construct is established as a task master.
4308 if Has_Task (Typ) then
4309 Build_Activation_Chain_Entity (N);
4310 Build_Master_Entity (Def_Id);
4313 -- Build a list controller for declarations where the type is anonymous
4314 -- access and the designated type is controlled. Only declarations from
4315 -- source files receive such controllers in order to provide the same
4316 -- lifespan for any potential coextensions that may be associated with
4317 -- the object. Finalization lists of internal controlled anonymous
4318 -- access objects are already handled in Expand_N_Allocator.
4320 if Comes_From_Source (N)
4321 and then Ekind (Typ) = E_Anonymous_Access_Type
4322 and then Is_Controlled (Directly_Designated_Type (Typ))
4323 and then No (Associated_Final_Chain (Typ))
4325 Build_Final_List (N, Typ);
4328 -- Default initialization required, and no expression present
4332 -- Expand Initialize call for controlled objects. One may wonder why
4333 -- the Initialize Call is not done in the regular Init procedure
4334 -- attached to the record type. That's because the init procedure is
4335 -- recursively called on each component, including _Parent, thus the
4336 -- Init call for a controlled object would generate not only one
4337 -- Initialize call as it is required but one for each ancestor of
4338 -- its type. This processing is suppressed if No_Initialization set.
4340 if not Needs_Finalization (Typ)
4341 or else No_Initialization (N)
4345 elsif not Abort_Allowed
4346 or else not Comes_From_Source (N)
4348 Insert_Actions_After (Init_After,
4350 Ref => New_Occurrence_Of (Def_Id, Loc),
4351 Typ => Base_Type (Typ),
4352 Flist_Ref => Find_Final_List (Def_Id),
4353 With_Attach => Make_Integer_Literal (Loc, 1)));
4358 -- We need to protect the initialize call
4362 -- Initialize (...);
4364 -- Undefer_Abort.all;
4367 -- ??? this won't protect the initialize call for controlled
4368 -- components which are part of the init proc, so this block
4369 -- should probably also contain the call to _init_proc but this
4370 -- requires some code reorganization...
4373 L : constant List_Id :=
4375 (Ref => New_Occurrence_Of (Def_Id, Loc),
4376 Typ => Base_Type (Typ),
4377 Flist_Ref => Find_Final_List (Def_Id),
4378 With_Attach => Make_Integer_Literal (Loc, 1));
4380 Blk : constant Node_Id :=
4381 Make_Block_Statement (Loc,
4382 Handled_Statement_Sequence =>
4383 Make_Handled_Sequence_Of_Statements (Loc, L));
4386 Prepend_To (L, Build_Runtime_Call (Loc, RE_Abort_Defer));
4387 Set_At_End_Proc (Handled_Statement_Sequence (Blk),
4388 New_Occurrence_Of (RTE (RE_Abort_Undefer_Direct), Loc));
4389 Insert_Actions_After (Init_After, New_List (Blk));
4390 Expand_At_End_Handler
4391 (Handled_Statement_Sequence (Blk), Entity (Identifier (Blk)));
4395 -- Call type initialization procedure if there is one. We build the
4396 -- call and put it immediately after the object declaration, so that
4397 -- it will be expanded in the usual manner. Note that this will
4398 -- result in proper handling of defaulted discriminants.
4400 -- Need call if there is a base init proc
4402 if Has_Non_Null_Base_Init_Proc (Typ)
4404 -- Suppress call if No_Initialization set on declaration
4406 and then not No_Initialization (N)
4408 -- Suppress call for special case of value type for VM
4410 and then not Is_Value_Type (Typ)
4412 -- Suppress call if Suppress_Init_Proc set on the type. This is
4413 -- needed for the derived type case, where Suppress_Initialization
4414 -- may be set for the derived type, even if there is an init proc
4415 -- defined for the root type.
4417 and then not Suppress_Init_Proc (Typ)
4419 -- Return without initializing when No_Default_Initialization
4420 -- applies. Note that the actual restriction check occurs later,
4421 -- when the object is frozen, because we don't know yet whether
4422 -- the object is imported, which is a case where the check does
4425 if Restriction_Active (No_Default_Initialization) then
4429 -- The call to the initialization procedure does NOT freeze the
4430 -- object being initialized. This is because the call is not a
4431 -- source level call. This works fine, because the only possible
4432 -- statements depending on freeze status that can appear after the
4433 -- Init_Proc call are rep clauses which can safely appear after
4434 -- actual references to the object. Note that this call may
4435 -- subsequently be removed (if a pragma Import is encountered),
4436 -- or moved to the freeze actions for the object (e.g. if an
4437 -- address clause is applied to the object, causing it to get
4438 -- delayed freezing).
4440 Id_Ref := New_Reference_To (Def_Id, Loc);
4441 Set_Must_Not_Freeze (Id_Ref);
4442 Set_Assignment_OK (Id_Ref);
4445 Init_Expr : constant Node_Id :=
4446 Static_Initialization (Base_Init_Proc (Typ));
4448 if Present (Init_Expr) then
4450 (N, New_Copy_Tree (Init_Expr, New_Scope => Current_Scope));
4453 Initialization_Warning (Id_Ref);
4455 Insert_Actions_After (Init_After,
4456 Build_Initialization_Call (Loc, Id_Ref, Typ));
4460 -- If simple initialization is required, then set an appropriate
4461 -- simple initialization expression in place. This special
4462 -- initialization is required even though No_Init_Flag is present,
4463 -- but is not needed if there was an explicit initialization.
4465 -- An internally generated temporary needs no initialization because
4466 -- it will be assigned subsequently. In particular, there is no point
4467 -- in applying Initialize_Scalars to such a temporary.
4469 elsif Needs_Simple_Initialization (Typ)
4470 and then not Is_Internal (Def_Id)
4471 and then not Has_Init_Expression (N)
4473 Set_No_Initialization (N, False);
4474 Set_Expression (N, Get_Simple_Init_Val (Typ, N, Esize (Def_Id)));
4475 Analyze_And_Resolve (Expression (N), Typ);
4478 -- Generate attribute for Persistent_BSS if needed
4480 if Persistent_BSS_Mode
4481 and then Comes_From_Source (N)
4482 and then Is_Potentially_Persistent_Type (Typ)
4483 and then not Has_Init_Expression (N)
4484 and then Is_Library_Level_Entity (Def_Id)
4490 Make_Linker_Section_Pragma
4491 (Def_Id, Sloc (N), ".persistent.bss");
4492 Insert_After (N, Prag);
4497 -- If access type, then we know it is null if not initialized
4499 if Is_Access_Type (Typ) then
4500 Set_Is_Known_Null (Def_Id);
4503 -- Explicit initialization present
4506 -- Obtain actual expression from qualified expression
4508 if Nkind (Expr) = N_Qualified_Expression then
4509 Expr_Q := Expression (Expr);
4514 -- When we have the appropriate type of aggregate in the expression
4515 -- (it has been determined during analysis of the aggregate by
4516 -- setting the delay flag), let's perform in place assignment and
4517 -- thus avoid creating a temporary.
4519 if Is_Delayed_Aggregate (Expr_Q) then
4520 Convert_Aggr_In_Object_Decl (N);
4522 -- Ada 2005 (AI-318-02): If the initialization expression is a call
4523 -- to a build-in-place function, then access to the declared object
4524 -- must be passed to the function. Currently we limit such functions
4525 -- to those with constrained limited result subtypes, but eventually
4526 -- plan to expand the allowed forms of functions that are treated as
4529 elsif Ada_Version >= Ada_05
4530 and then Is_Build_In_Place_Function_Call (Expr_Q)
4532 Make_Build_In_Place_Call_In_Object_Declaration (N, Expr_Q);
4534 -- The previous call expands the expression initializing the
4535 -- built-in-place object into further code that will be analyzed
4536 -- later. No further expansion needed here.
4540 -- Ada 2005 (AI-251): Rewrite the expression that initializes a
4541 -- class-wide object to ensure that we copy the full object,
4542 -- unless we are targetting a VM where interfaces are handled by
4543 -- VM itself. Note that if the root type of Typ is an ancestor
4544 -- of Expr's type, both types share the same dispatch table and
4545 -- there is no need to displace the pointer.
4547 elsif Comes_From_Source (N)
4548 and then Is_Interface (Typ)
4550 pragma Assert (Is_Class_Wide_Type (Typ));
4552 -- If the object is a return object of an inherently limited type,
4553 -- which implies build-in-place treatment, bypass the special
4554 -- treatment of class-wide interface initialization below. In this
4555 -- case, the expansion of the return statement will take care of
4556 -- creating the object (via allocator) and initializing it.
4558 if Is_Return_Object (Def_Id)
4559 and then Is_Inherently_Limited_Type (Typ)
4563 elsif Tagged_Type_Expansion then
4565 Iface : constant Entity_Id := Root_Type (Typ);
4566 Expr_N : Node_Id := Expr;
4567 Expr_Typ : Entity_Id;
4574 -- If the original node of the expression was a conversion
4575 -- to this specific class-wide interface type then we
4576 -- restore the original node to generate code that
4577 -- statically displaces the pointer to the interface
4580 if not Comes_From_Source (Expr_N)
4581 and then Nkind (Expr_N) = N_Unchecked_Type_Conversion
4582 and then Nkind (Original_Node (Expr_N)) = N_Type_Conversion
4583 and then Etype (Original_Node (Expr_N)) = Typ
4585 Rewrite (Expr_N, Original_Node (Expression (N)));
4588 -- Avoid expansion of redundant interface conversion
4590 if Is_Interface (Etype (Expr_N))
4591 and then Nkind (Expr_N) = N_Type_Conversion
4592 and then Etype (Expr_N) = Typ
4594 Expr_N := Expression (Expr_N);
4595 Set_Expression (N, Expr_N);
4598 Expr_Typ := Base_Type (Etype (Expr_N));
4600 if Is_Class_Wide_Type (Expr_Typ) then
4601 Expr_Typ := Root_Type (Expr_Typ);
4605 -- CW : I'Class := Obj;
4608 -- CW : I'Class renames TiC!(Tmp.I_Tag);
4610 if Comes_From_Source (Expr_N)
4611 and then Nkind (Expr_N) = N_Identifier
4612 and then not Is_Interface (Expr_Typ)
4613 and then (Expr_Typ = Etype (Expr_Typ)
4615 Is_Variable_Size_Record (Etype (Expr_Typ)))
4618 Make_Object_Declaration (Loc,
4619 Defining_Identifier =>
4620 Make_Defining_Identifier (Loc,
4621 New_Internal_Name ('D')),
4622 Object_Definition =>
4623 New_Occurrence_Of (Expr_Typ, Loc),
4625 Unchecked_Convert_To (Expr_Typ,
4626 Relocate_Node (Expr_N)));
4628 -- Statically reference the tag associated with the
4632 Make_Object_Renaming_Declaration (Loc,
4633 Defining_Identifier =>
4634 Make_Defining_Identifier (Loc,
4635 New_Internal_Name ('D')),
4637 New_Occurrence_Of (Typ, Loc),
4639 Unchecked_Convert_To (Typ,
4640 Make_Selected_Component (Loc,
4643 (Defining_Identifier (Decl_1), Loc),
4646 (Find_Interface_Tag (Expr_Typ, Iface),
4652 -- IW : I'Class := Obj;
4654 -- type Equiv_Record is record ... end record;
4655 -- implicit subtype CW is <Class_Wide_Subtype>;
4656 -- Temp : CW := CW!(Obj'Address);
4657 -- IW : I'Class renames Displace (Temp, I'Tag);
4660 -- Generate the equivalent record type
4662 Expand_Subtype_From_Expr
4665 Subtype_Indic => Object_Definition (N),
4666 Exp => Expression (N));
4668 if not Is_Interface (Etype (Expression (N))) then
4669 New_Expr := Relocate_Node (Expression (N));
4672 Make_Explicit_Dereference (Loc,
4673 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4674 Make_Attribute_Reference (Loc,
4675 Prefix => Relocate_Node (Expression (N)),
4676 Attribute_Name => Name_Address)));
4680 Make_Object_Declaration (Loc,
4681 Defining_Identifier =>
4682 Make_Defining_Identifier (Loc,
4683 New_Internal_Name ('D')),
4684 Object_Definition =>
4686 (Etype (Object_Definition (N)), Loc),
4688 Unchecked_Convert_To
4689 (Etype (Object_Definition (N)), New_Expr));
4692 Make_Object_Renaming_Declaration (Loc,
4693 Defining_Identifier =>
4694 Make_Defining_Identifier (Loc,
4695 New_Internal_Name ('D')),
4697 New_Occurrence_Of (Typ, Loc),
4699 Unchecked_Convert_To (Typ,
4700 Make_Explicit_Dereference (Loc,
4701 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4702 Make_Function_Call (Loc,
4704 New_Reference_To (RTE (RE_Displace), Loc),
4705 Parameter_Associations => New_List (
4706 Make_Attribute_Reference (Loc,
4709 (Defining_Identifier (Decl_1), Loc),
4710 Attribute_Name => Name_Address),
4712 Unchecked_Convert_To (RTE (RE_Tag),
4716 (Access_Disp_Table (Iface))),
4720 Insert_Action (N, Decl_1);
4721 Rewrite (N, Decl_2);
4724 -- Replace internal identifier of Decl_2 by the identifier
4725 -- found in the sources. We also have to exchange entities
4726 -- containing their defining identifiers to ensure the
4727 -- correct replacement of the object declaration by this
4728 -- object renaming declaration (because such definings
4729 -- identifier have been previously added by Enter_Name to
4730 -- the current scope). We must preserve the homonym chain
4731 -- of the source entity as well.
4733 Set_Chars (Defining_Identifier (N), Chars (Def_Id));
4734 Set_Homonym (Defining_Identifier (N), Homonym (Def_Id));
4735 Exchange_Entities (Defining_Identifier (N), Def_Id);
4742 -- In most cases, we must check that the initial value meets any
4743 -- constraint imposed by the declared type. However, there is one
4744 -- very important exception to this rule. If the entity has an
4745 -- unconstrained nominal subtype, then it acquired its constraints
4746 -- from the expression in the first place, and not only does this
4747 -- mean that the constraint check is not needed, but an attempt to
4748 -- perform the constraint check can cause order of elaboration
4751 if not Is_Constr_Subt_For_U_Nominal (Typ) then
4753 -- If this is an allocator for an aggregate that has been
4754 -- allocated in place, delay checks until assignments are
4755 -- made, because the discriminants are not initialized.
4757 if Nkind (Expr) = N_Allocator
4758 and then No_Initialization (Expr)
4762 Apply_Constraint_Check (Expr, Typ);
4764 -- If the expression has been marked as requiring a range
4765 -- generate it now and reset the flag.
4767 if Do_Range_Check (Expr) then
4768 Set_Do_Range_Check (Expr, False);
4769 Generate_Range_Check (Expr, Typ, CE_Range_Check_Failed);
4774 -- If the type is controlled and not inherently limited, then
4775 -- the target is adjusted after the copy and attached to the
4776 -- finalization list. However, no adjustment is done in the case
4777 -- where the object was initialized by a call to a function whose
4778 -- result is built in place, since no copy occurred. (Eventually
4779 -- we plan to support in-place function results for some cases
4780 -- of nonlimited types. ???) Similarly, no adjustment is required
4781 -- if we are going to rewrite the object declaration into a
4782 -- renaming declaration.
4784 if Needs_Finalization (Typ)
4785 and then not Is_Inherently_Limited_Type (Typ)
4786 and then not Rewrite_As_Renaming
4788 Insert_Actions_After (Init_After,
4790 Ref => New_Reference_To (Def_Id, Loc),
4791 Typ => Base_Type (Typ),
4792 Flist_Ref => Find_Final_List (Def_Id),
4793 With_Attach => Make_Integer_Literal (Loc, 1)));
4796 -- For tagged types, when an init value is given, the tag has to
4797 -- be re-initialized separately in order to avoid the propagation
4798 -- of a wrong tag coming from a view conversion unless the type
4799 -- is class wide (in this case the tag comes from the init value).
4800 -- Suppress the tag assignment when VM_Target because VM tags are
4801 -- represented implicitly in objects. Ditto for types that are
4802 -- CPP_CLASS, and for initializations that are aggregates, because
4803 -- they have to have the right tag.
4805 if Is_Tagged_Type (Typ)
4806 and then not Is_Class_Wide_Type (Typ)
4807 and then not Is_CPP_Class (Typ)
4808 and then Tagged_Type_Expansion
4809 and then Nkind (Expr) /= N_Aggregate
4811 -- The re-assignment of the tag has to be done even if the
4812 -- object is a constant.
4815 Make_Selected_Component (Loc,
4816 Prefix => New_Reference_To (Def_Id, Loc),
4818 New_Reference_To (First_Tag_Component (Typ), Loc));
4820 Set_Assignment_OK (New_Ref);
4822 Insert_After (Init_After,
4823 Make_Assignment_Statement (Loc,
4826 Unchecked_Convert_To (RTE (RE_Tag),
4830 (Access_Disp_Table (Base_Type (Typ)))),
4833 elsif Is_Tagged_Type (Typ)
4834 and then Is_CPP_Constructor_Call (Expr)
4836 -- The call to the initialization procedure does NOT freeze the
4837 -- object being initialized.
4839 Id_Ref := New_Reference_To (Def_Id, Loc);
4840 Set_Must_Not_Freeze (Id_Ref);
4841 Set_Assignment_OK (Id_Ref);
4843 Insert_Actions_After (Init_After,
4844 Build_Initialization_Call (Loc, Id_Ref, Typ,
4845 Constructor_Ref => Expr));
4847 -- We remove here the original call to the constructor
4848 -- to avoid its management in the backend
4850 Set_Expression (N, Empty);
4853 -- For discrete types, set the Is_Known_Valid flag if the
4854 -- initializing value is known to be valid.
4856 elsif Is_Discrete_Type (Typ) and then Expr_Known_Valid (Expr) then
4857 Set_Is_Known_Valid (Def_Id);
4859 elsif Is_Access_Type (Typ) then
4861 -- For access types set the Is_Known_Non_Null flag if the
4862 -- initializing value is known to be non-null. We can also set
4863 -- Can_Never_Be_Null if this is a constant.
4865 if Known_Non_Null (Expr) then
4866 Set_Is_Known_Non_Null (Def_Id, True);
4868 if Constant_Present (N) then
4869 Set_Can_Never_Be_Null (Def_Id);
4874 -- If validity checking on copies, validate initial expression.
4875 -- But skip this if declaration is for a generic type, since it
4876 -- makes no sense to validate generic types. Not clear if this
4877 -- can happen for legal programs, but it definitely can arise
4878 -- from previous instantiation errors.
4880 if Validity_Checks_On
4881 and then Validity_Check_Copies
4882 and then not Is_Generic_Type (Etype (Def_Id))
4884 Ensure_Valid (Expr);
4885 Set_Is_Known_Valid (Def_Id);
4889 -- Cases where the back end cannot handle the initialization directly
4890 -- In such cases, we expand an assignment that will be appropriately
4891 -- handled by Expand_N_Assignment_Statement.
4893 -- The exclusion of the unconstrained case is wrong, but for now it
4894 -- is too much trouble ???
4896 if (Is_Possibly_Unaligned_Slice (Expr)
4897 or else (Is_Possibly_Unaligned_Object (Expr)
4898 and then not Represented_As_Scalar (Etype (Expr))))
4900 -- The exclusion of the unconstrained case is wrong, but for now
4901 -- it is too much trouble ???
4903 and then not (Is_Array_Type (Etype (Expr))
4904 and then not Is_Constrained (Etype (Expr)))
4907 Stat : constant Node_Id :=
4908 Make_Assignment_Statement (Loc,
4909 Name => New_Reference_To (Def_Id, Loc),
4910 Expression => Relocate_Node (Expr));
4912 Set_Expression (N, Empty);
4913 Set_No_Initialization (N);
4914 Set_Assignment_OK (Name (Stat));
4915 Set_No_Ctrl_Actions (Stat);
4916 Insert_After_And_Analyze (Init_After, Stat);
4920 -- Final transformation, if the initializing expression is an entity
4921 -- for a variable with OK_To_Rename set, then we transform:
4927 -- X : typ renames expr
4929 -- provided that X is not aliased. The aliased case has to be
4930 -- excluded in general because Expr will not be aliased in general.
4932 if Rewrite_As_Renaming then
4934 Make_Object_Renaming_Declaration (Loc,
4935 Defining_Identifier => Defining_Identifier (N),
4936 Subtype_Mark => Object_Definition (N),
4939 -- We do not analyze this renaming declaration, because all its
4940 -- components have already been analyzed, and if we were to go
4941 -- ahead and analyze it, we would in effect be trying to generate
4942 -- another declaration of X, which won't do!
4944 Set_Renamed_Object (Defining_Identifier (N), Expr_Q);
4951 when RE_Not_Available =>
4953 end Expand_N_Object_Declaration;
4955 ---------------------------------
4956 -- Expand_N_Subtype_Indication --
4957 ---------------------------------
4959 -- Add a check on the range of the subtype. The static case is partially
4960 -- duplicated by Process_Range_Expr_In_Decl in Sem_Ch3, but we still need
4961 -- to check here for the static case in order to avoid generating
4962 -- extraneous expanded code. Also deal with validity checking.
4964 procedure Expand_N_Subtype_Indication (N : Node_Id) is
4965 Ran : constant Node_Id := Range_Expression (Constraint (N));
4966 Typ : constant Entity_Id := Entity (Subtype_Mark (N));
4969 if Nkind (Constraint (N)) = N_Range_Constraint then
4970 Validity_Check_Range (Range_Expression (Constraint (N)));
4973 if Nkind_In (Parent (N), N_Constrained_Array_Definition, N_Slice) then
4974 Apply_Range_Check (Ran, Typ);
4976 end Expand_N_Subtype_Indication;
4978 ---------------------------
4979 -- Expand_N_Variant_Part --
4980 ---------------------------
4982 -- If the last variant does not contain the Others choice, replace it with
4983 -- an N_Others_Choice node since Gigi always wants an Others. Note that we
4984 -- do not bother to call Analyze on the modified variant part, since it's
4985 -- only effect would be to compute the Others_Discrete_Choices node
4986 -- laboriously, and of course we already know the list of choices that
4987 -- corresponds to the others choice (it's the list we are replacing!)
4989 procedure Expand_N_Variant_Part (N : Node_Id) is
4990 Last_Var : constant Node_Id := Last_Non_Pragma (Variants (N));
4991 Others_Node : Node_Id;
4993 if Nkind (First (Discrete_Choices (Last_Var))) /= N_Others_Choice then
4994 Others_Node := Make_Others_Choice (Sloc (Last_Var));
4995 Set_Others_Discrete_Choices
4996 (Others_Node, Discrete_Choices (Last_Var));
4997 Set_Discrete_Choices (Last_Var, New_List (Others_Node));
4999 end Expand_N_Variant_Part;
5001 ---------------------------------
5002 -- Expand_Previous_Access_Type --
5003 ---------------------------------
5005 procedure Expand_Previous_Access_Type (Def_Id : Entity_Id) is
5006 T : Entity_Id := First_Entity (Current_Scope);
5009 -- Find all access types declared in the current scope, whose
5010 -- designated type is Def_Id. If it does not have a Master_Id,
5013 while Present (T) loop
5014 if Is_Access_Type (T)
5015 and then Designated_Type (T) = Def_Id
5016 and then No (Master_Id (T))
5018 Build_Master_Entity (Def_Id);
5019 Build_Master_Renaming (Parent (Def_Id), T);
5024 end Expand_Previous_Access_Type;
5026 ------------------------------
5027 -- Expand_Record_Controller --
5028 ------------------------------
5030 procedure Expand_Record_Controller (T : Entity_Id) is
5031 Def : Node_Id := Type_Definition (Parent (T));
5032 Comp_List : Node_Id;
5033 Comp_Decl : Node_Id;
5035 First_Comp : Node_Id;
5036 Controller_Type : Entity_Id;
5040 if Nkind (Def) = N_Derived_Type_Definition then
5041 Def := Record_Extension_Part (Def);
5044 if Null_Present (Def) then
5045 Set_Component_List (Def,
5046 Make_Component_List (Sloc (Def),
5047 Component_Items => Empty_List,
5048 Variant_Part => Empty,
5049 Null_Present => True));
5052 Comp_List := Component_List (Def);
5054 if Null_Present (Comp_List)
5055 or else Is_Empty_List (Component_Items (Comp_List))
5057 Loc := Sloc (Comp_List);
5059 Loc := Sloc (First (Component_Items (Comp_List)));
5062 if Is_Inherently_Limited_Type (T) then
5063 Controller_Type := RTE (RE_Limited_Record_Controller);
5065 Controller_Type := RTE (RE_Record_Controller);
5068 Ent := Make_Defining_Identifier (Loc, Name_uController);
5071 Make_Component_Declaration (Loc,
5072 Defining_Identifier => Ent,
5073 Component_Definition =>
5074 Make_Component_Definition (Loc,
5075 Aliased_Present => False,
5076 Subtype_Indication => New_Reference_To (Controller_Type, Loc)));
5078 if Null_Present (Comp_List)
5079 or else Is_Empty_List (Component_Items (Comp_List))
5081 Set_Component_Items (Comp_List, New_List (Comp_Decl));
5082 Set_Null_Present (Comp_List, False);
5085 -- The controller cannot be placed before the _Parent field since
5086 -- gigi lays out field in order and _parent must be first to preserve
5087 -- the polymorphism of tagged types.
5089 First_Comp := First (Component_Items (Comp_List));
5091 if not Is_Tagged_Type (T) then
5092 Insert_Before (First_Comp, Comp_Decl);
5094 -- if T is a tagged type, place controller declaration after parent
5095 -- field and after eventual tags of interface types.
5098 while Present (First_Comp)
5100 (Chars (Defining_Identifier (First_Comp)) = Name_uParent
5101 or else Is_Tag (Defining_Identifier (First_Comp))
5103 -- Ada 2005 (AI-251): The following condition covers secondary
5104 -- tags but also the adjacent component containing the offset
5105 -- to the base of the object (component generated if the parent
5106 -- has discriminants --- see Add_Interface_Tag_Components).
5107 -- This is required to avoid the addition of the controller
5108 -- between the secondary tag and its adjacent component.
5112 (Defining_Identifier (First_Comp))))
5117 -- An empty tagged extension might consist only of the parent
5118 -- component. Otherwise insert the controller before the first
5119 -- component that is neither parent nor tag.
5121 if Present (First_Comp) then
5122 Insert_Before (First_Comp, Comp_Decl);
5124 Append (Comp_Decl, Component_Items (Comp_List));
5130 Analyze (Comp_Decl);
5131 Set_Ekind (Ent, E_Component);
5132 Init_Component_Location (Ent);
5134 -- Move the _controller entity ahead in the list of internal entities
5135 -- of the enclosing record so that it is selected instead of a
5136 -- potentially inherited one.
5139 E : constant Entity_Id := Last_Entity (T);
5143 pragma Assert (Chars (E) = Name_uController);
5145 Set_Next_Entity (E, First_Entity (T));
5146 Set_First_Entity (T, E);
5148 Comp := Next_Entity (E);
5149 while Next_Entity (Comp) /= E loop
5153 Set_Next_Entity (Comp, Empty);
5154 Set_Last_Entity (T, Comp);
5160 when RE_Not_Available =>
5162 end Expand_Record_Controller;
5164 ------------------------
5165 -- Expand_Tagged_Root --
5166 ------------------------
5168 procedure Expand_Tagged_Root (T : Entity_Id) is
5169 Def : constant Node_Id := Type_Definition (Parent (T));
5170 Comp_List : Node_Id;
5171 Comp_Decl : Node_Id;
5172 Sloc_N : Source_Ptr;
5175 if Null_Present (Def) then
5176 Set_Component_List (Def,
5177 Make_Component_List (Sloc (Def),
5178 Component_Items => Empty_List,
5179 Variant_Part => Empty,
5180 Null_Present => True));
5183 Comp_List := Component_List (Def);
5185 if Null_Present (Comp_List)
5186 or else Is_Empty_List (Component_Items (Comp_List))
5188 Sloc_N := Sloc (Comp_List);
5190 Sloc_N := Sloc (First (Component_Items (Comp_List)));
5194 Make_Component_Declaration (Sloc_N,
5195 Defining_Identifier => First_Tag_Component (T),
5196 Component_Definition =>
5197 Make_Component_Definition (Sloc_N,
5198 Aliased_Present => False,
5199 Subtype_Indication => New_Reference_To (RTE (RE_Tag), Sloc_N)));
5201 if Null_Present (Comp_List)
5202 or else Is_Empty_List (Component_Items (Comp_List))
5204 Set_Component_Items (Comp_List, New_List (Comp_Decl));
5205 Set_Null_Present (Comp_List, False);
5208 Insert_Before (First (Component_Items (Comp_List)), Comp_Decl);
5211 -- We don't Analyze the whole expansion because the tag component has
5212 -- already been analyzed previously. Here we just insure that the tree
5213 -- is coherent with the semantic decoration
5215 Find_Type (Subtype_Indication (Component_Definition (Comp_Decl)));
5218 when RE_Not_Available =>
5220 end Expand_Tagged_Root;
5222 ----------------------
5223 -- Clean_Task_Names --
5224 ----------------------
5226 procedure Clean_Task_Names
5228 Proc_Id : Entity_Id)
5232 and then not Restriction_Active (No_Implicit_Heap_Allocations)
5233 and then not Global_Discard_Names
5234 and then Tagged_Type_Expansion
5236 Set_Uses_Sec_Stack (Proc_Id);
5238 end Clean_Task_Names;
5240 ------------------------------
5241 -- Expand_Freeze_Array_Type --
5242 ------------------------------
5244 procedure Expand_Freeze_Array_Type (N : Node_Id) is
5245 Typ : constant Entity_Id := Entity (N);
5246 Comp_Typ : constant Entity_Id := Component_Type (Typ);
5247 Base : constant Entity_Id := Base_Type (Typ);
5250 if not Is_Bit_Packed_Array (Typ) then
5252 -- If the component contains tasks, so does the array type. This may
5253 -- not be indicated in the array type because the component may have
5254 -- been a private type at the point of definition. Same if component
5255 -- type is controlled.
5257 Set_Has_Task (Base, Has_Task (Comp_Typ));
5258 Set_Has_Controlled_Component (Base,
5259 Has_Controlled_Component (Comp_Typ)
5260 or else Is_Controlled (Comp_Typ));
5262 if No (Init_Proc (Base)) then
5264 -- If this is an anonymous array created for a declaration with
5265 -- an initial value, its init_proc will never be called. The
5266 -- initial value itself may have been expanded into assignments,
5267 -- in which case the object declaration is carries the
5268 -- No_Initialization flag.
5271 and then Nkind (Associated_Node_For_Itype (Base)) =
5272 N_Object_Declaration
5273 and then (Present (Expression (Associated_Node_For_Itype (Base)))
5275 No_Initialization (Associated_Node_For_Itype (Base)))
5279 -- We do not need an init proc for string or wide [wide] string,
5280 -- since the only time these need initialization in normalize or
5281 -- initialize scalars mode, and these types are treated specially
5282 -- and do not need initialization procedures.
5284 elsif Root_Type (Base) = Standard_String
5285 or else Root_Type (Base) = Standard_Wide_String
5286 or else Root_Type (Base) = Standard_Wide_Wide_String
5290 -- Otherwise we have to build an init proc for the subtype
5293 Build_Array_Init_Proc (Base, N);
5298 if Has_Controlled_Component (Base) then
5299 Build_Controlling_Procs (Base);
5301 if not Is_Limited_Type (Comp_Typ)
5302 and then Number_Dimensions (Typ) = 1
5304 Build_Slice_Assignment (Typ);
5307 elsif Ekind (Comp_Typ) = E_Anonymous_Access_Type
5308 and then Needs_Finalization (Directly_Designated_Type (Comp_Typ))
5310 Set_Associated_Final_Chain (Comp_Typ, Add_Final_Chain (Typ));
5314 -- For packed case, default initialization, except if the component type
5315 -- is itself a packed structure with an initialization procedure, or
5316 -- initialize/normalize scalars active, and we have a base type, or the
5317 -- type is public, because in that case a client might specify
5318 -- Normalize_Scalars and there better be a public Init_Proc for it.
5320 elsif (Present (Init_Proc (Component_Type (Base)))
5321 and then No (Base_Init_Proc (Base)))
5322 or else (Init_Or_Norm_Scalars and then Base = Typ)
5323 or else Is_Public (Typ)
5325 Build_Array_Init_Proc (Base, N);
5327 end Expand_Freeze_Array_Type;
5329 ------------------------------------
5330 -- Expand_Freeze_Enumeration_Type --
5331 ------------------------------------
5333 procedure Expand_Freeze_Enumeration_Type (N : Node_Id) is
5334 Typ : constant Entity_Id := Entity (N);
5335 Loc : constant Source_Ptr := Sloc (Typ);
5342 Is_Contiguous : Boolean;
5347 pragma Warnings (Off, Func);
5350 -- Various optimizations possible if given representation is contiguous
5352 Is_Contiguous := True;
5354 Ent := First_Literal (Typ);
5355 Last_Repval := Enumeration_Rep (Ent);
5358 while Present (Ent) loop
5359 if Enumeration_Rep (Ent) - Last_Repval /= 1 then
5360 Is_Contiguous := False;
5363 Last_Repval := Enumeration_Rep (Ent);
5369 if Is_Contiguous then
5370 Set_Has_Contiguous_Rep (Typ);
5371 Ent := First_Literal (Typ);
5373 Lst := New_List (New_Reference_To (Ent, Sloc (Ent)));
5376 -- Build list of literal references
5381 Ent := First_Literal (Typ);
5382 while Present (Ent) loop
5383 Append_To (Lst, New_Reference_To (Ent, Sloc (Ent)));
5389 -- Now build an array declaration
5391 -- typA : array (Natural range 0 .. num - 1) of ctype :=
5392 -- (v, v, v, v, v, ....)
5394 -- where ctype is the corresponding integer type. If the representation
5395 -- is contiguous, we only keep the first literal, which provides the
5396 -- offset for Pos_To_Rep computations.
5399 Make_Defining_Identifier (Loc,
5400 Chars => New_External_Name (Chars (Typ), 'A'));
5402 Append_Freeze_Action (Typ,
5403 Make_Object_Declaration (Loc,
5404 Defining_Identifier => Arr,
5405 Constant_Present => True,
5407 Object_Definition =>
5408 Make_Constrained_Array_Definition (Loc,
5409 Discrete_Subtype_Definitions => New_List (
5410 Make_Subtype_Indication (Loc,
5411 Subtype_Mark => New_Reference_To (Standard_Natural, Loc),
5413 Make_Range_Constraint (Loc,
5417 Make_Integer_Literal (Loc, 0),
5419 Make_Integer_Literal (Loc, Num - 1))))),
5421 Component_Definition =>
5422 Make_Component_Definition (Loc,
5423 Aliased_Present => False,
5424 Subtype_Indication => New_Reference_To (Typ, Loc))),
5427 Make_Aggregate (Loc,
5428 Expressions => Lst)));
5430 Set_Enum_Pos_To_Rep (Typ, Arr);
5432 -- Now we build the function that converts representation values to
5433 -- position values. This function has the form:
5435 -- function _Rep_To_Pos (A : etype; F : Boolean) return Integer is
5438 -- when enum-lit'Enum_Rep => return posval;
5439 -- when enum-lit'Enum_Rep => return posval;
5442 -- [raise Constraint_Error when F "invalid data"]
5447 -- Note: the F parameter determines whether the others case (no valid
5448 -- representation) raises Constraint_Error or returns a unique value
5449 -- of minus one. The latter case is used, e.g. in 'Valid code.
5451 -- Note: the reason we use Enum_Rep values in the case here is to avoid
5452 -- the code generator making inappropriate assumptions about the range
5453 -- of the values in the case where the value is invalid. ityp is a
5454 -- signed or unsigned integer type of appropriate width.
5456 -- Note: if exceptions are not supported, then we suppress the raise
5457 -- and return -1 unconditionally (this is an erroneous program in any
5458 -- case and there is no obligation to raise Constraint_Error here!) We
5459 -- also do this if pragma Restrictions (No_Exceptions) is active.
5461 -- Is this right??? What about No_Exception_Propagation???
5463 -- Representations are signed
5465 if Enumeration_Rep (First_Literal (Typ)) < 0 then
5467 -- The underlying type is signed. Reset the Is_Unsigned_Type
5468 -- explicitly, because it might have been inherited from
5471 Set_Is_Unsigned_Type (Typ, False);
5473 if Esize (Typ) <= Standard_Integer_Size then
5474 Ityp := Standard_Integer;
5476 Ityp := Universal_Integer;
5479 -- Representations are unsigned
5482 if Esize (Typ) <= Standard_Integer_Size then
5483 Ityp := RTE (RE_Unsigned);
5485 Ityp := RTE (RE_Long_Long_Unsigned);
5489 -- The body of the function is a case statement. First collect case
5490 -- alternatives, or optimize the contiguous case.
5494 -- If representation is contiguous, Pos is computed by subtracting
5495 -- the representation of the first literal.
5497 if Is_Contiguous then
5498 Ent := First_Literal (Typ);
5500 if Enumeration_Rep (Ent) = Last_Repval then
5502 -- Another special case: for a single literal, Pos is zero
5504 Pos_Expr := Make_Integer_Literal (Loc, Uint_0);
5508 Convert_To (Standard_Integer,
5509 Make_Op_Subtract (Loc,
5511 Unchecked_Convert_To (Ityp,
5512 Make_Identifier (Loc, Name_uA)),
5514 Make_Integer_Literal (Loc,
5516 Enumeration_Rep (First_Literal (Typ)))));
5520 Make_Case_Statement_Alternative (Loc,
5521 Discrete_Choices => New_List (
5522 Make_Range (Sloc (Enumeration_Rep_Expr (Ent)),
5524 Make_Integer_Literal (Loc,
5525 Intval => Enumeration_Rep (Ent)),
5527 Make_Integer_Literal (Loc, Intval => Last_Repval))),
5529 Statements => New_List (
5530 Make_Simple_Return_Statement (Loc,
5531 Expression => Pos_Expr))));
5534 Ent := First_Literal (Typ);
5535 while Present (Ent) loop
5537 Make_Case_Statement_Alternative (Loc,
5538 Discrete_Choices => New_List (
5539 Make_Integer_Literal (Sloc (Enumeration_Rep_Expr (Ent)),
5540 Intval => Enumeration_Rep (Ent))),
5542 Statements => New_List (
5543 Make_Simple_Return_Statement (Loc,
5545 Make_Integer_Literal (Loc,
5546 Intval => Enumeration_Pos (Ent))))));
5552 -- In normal mode, add the others clause with the test
5554 if not No_Exception_Handlers_Set then
5556 Make_Case_Statement_Alternative (Loc,
5557 Discrete_Choices => New_List (Make_Others_Choice (Loc)),
5558 Statements => New_List (
5559 Make_Raise_Constraint_Error (Loc,
5560 Condition => Make_Identifier (Loc, Name_uF),
5561 Reason => CE_Invalid_Data),
5562 Make_Simple_Return_Statement (Loc,
5564 Make_Integer_Literal (Loc, -1)))));
5566 -- If either of the restrictions No_Exceptions_Handlers/Propagation is
5567 -- active then return -1 (we cannot usefully raise Constraint_Error in
5568 -- this case). See description above for further details.
5572 Make_Case_Statement_Alternative (Loc,
5573 Discrete_Choices => New_List (Make_Others_Choice (Loc)),
5574 Statements => New_List (
5575 Make_Simple_Return_Statement (Loc,
5577 Make_Integer_Literal (Loc, -1)))));
5580 -- Now we can build the function body
5583 Make_Defining_Identifier (Loc, Make_TSS_Name (Typ, TSS_Rep_To_Pos));
5586 Make_Subprogram_Body (Loc,
5588 Make_Function_Specification (Loc,
5589 Defining_Unit_Name => Fent,
5590 Parameter_Specifications => New_List (
5591 Make_Parameter_Specification (Loc,
5592 Defining_Identifier =>
5593 Make_Defining_Identifier (Loc, Name_uA),
5594 Parameter_Type => New_Reference_To (Typ, Loc)),
5595 Make_Parameter_Specification (Loc,
5596 Defining_Identifier =>
5597 Make_Defining_Identifier (Loc, Name_uF),
5598 Parameter_Type => New_Reference_To (Standard_Boolean, Loc))),
5600 Result_Definition => New_Reference_To (Standard_Integer, Loc)),
5602 Declarations => Empty_List,
5604 Handled_Statement_Sequence =>
5605 Make_Handled_Sequence_Of_Statements (Loc,
5606 Statements => New_List (
5607 Make_Case_Statement (Loc,
5609 Unchecked_Convert_To (Ityp,
5610 Make_Identifier (Loc, Name_uA)),
5611 Alternatives => Lst))));
5613 Set_TSS (Typ, Fent);
5616 if not Debug_Generated_Code then
5617 Set_Debug_Info_Off (Fent);
5621 when RE_Not_Available =>
5623 end Expand_Freeze_Enumeration_Type;
5625 -------------------------------
5626 -- Expand_Freeze_Record_Type --
5627 -------------------------------
5629 procedure Expand_Freeze_Record_Type (N : Node_Id) is
5630 Def_Id : constant Node_Id := Entity (N);
5631 Type_Decl : constant Node_Id := Parent (Def_Id);
5633 Comp_Typ : Entity_Id;
5634 Has_Static_DT : Boolean := False;
5635 Predef_List : List_Id;
5637 Flist : Entity_Id := Empty;
5638 -- Finalization list allocated for the case of a type with anonymous
5639 -- access components whose designated type is potentially controlled.
5641 Renamed_Eq : Node_Id := Empty;
5642 -- Defining unit name for the predefined equality function in the case
5643 -- where the type has a primitive operation that is a renaming of
5644 -- predefined equality (but only if there is also an overriding
5645 -- user-defined equality function). Used to pass this entity from
5646 -- Make_Predefined_Primitive_Specs to Predefined_Primitive_Bodies.
5648 Wrapper_Decl_List : List_Id := No_List;
5649 Wrapper_Body_List : List_Id := No_List;
5650 Null_Proc_Decl_List : List_Id := No_List;
5652 -- Start of processing for Expand_Freeze_Record_Type
5655 -- Build discriminant checking functions if not a derived type (for
5656 -- derived types that are not tagged types, always use the discriminant
5657 -- checking functions of the parent type). However, for untagged types
5658 -- the derivation may have taken place before the parent was frozen, so
5659 -- we copy explicitly the discriminant checking functions from the
5660 -- parent into the components of the derived type.
5662 if not Is_Derived_Type (Def_Id)
5663 or else Has_New_Non_Standard_Rep (Def_Id)
5664 or else Is_Tagged_Type (Def_Id)
5666 Build_Discr_Checking_Funcs (Type_Decl);
5668 elsif Is_Derived_Type (Def_Id)
5669 and then not Is_Tagged_Type (Def_Id)
5671 -- If we have a derived Unchecked_Union, we do not inherit the
5672 -- discriminant checking functions from the parent type since the
5673 -- discriminants are non existent.
5675 and then not Is_Unchecked_Union (Def_Id)
5676 and then Has_Discriminants (Def_Id)
5679 Old_Comp : Entity_Id;
5683 First_Component (Base_Type (Underlying_Type (Etype (Def_Id))));
5684 Comp := First_Component (Def_Id);
5685 while Present (Comp) loop
5686 if Ekind (Comp) = E_Component
5687 and then Chars (Comp) = Chars (Old_Comp)
5689 Set_Discriminant_Checking_Func (Comp,
5690 Discriminant_Checking_Func (Old_Comp));
5693 Next_Component (Old_Comp);
5694 Next_Component (Comp);
5699 if Is_Derived_Type (Def_Id)
5700 and then Is_Limited_Type (Def_Id)
5701 and then Is_Tagged_Type (Def_Id)
5703 Check_Stream_Attributes (Def_Id);
5706 -- Update task and controlled component flags, because some of the
5707 -- component types may have been private at the point of the record
5710 Comp := First_Component (Def_Id);
5712 while Present (Comp) loop
5713 Comp_Typ := Etype (Comp);
5715 if Has_Task (Comp_Typ) then
5716 Set_Has_Task (Def_Id);
5718 elsif Has_Controlled_Component (Comp_Typ)
5719 or else (Chars (Comp) /= Name_uParent
5720 and then Is_Controlled (Comp_Typ))
5722 Set_Has_Controlled_Component (Def_Id);
5724 elsif Ekind (Comp_Typ) = E_Anonymous_Access_Type
5725 and then Needs_Finalization (Directly_Designated_Type (Comp_Typ))
5728 Flist := Add_Final_Chain (Def_Id);
5731 Set_Associated_Final_Chain (Comp_Typ, Flist);
5734 Next_Component (Comp);
5737 -- Handle constructors of non-tagged CPP_Class types
5739 if not Is_Tagged_Type (Def_Id) and then Is_CPP_Class (Def_Id) then
5740 Set_CPP_Constructors (Def_Id);
5743 -- Creation of the Dispatch Table. Note that a Dispatch Table is built
5744 -- for regular tagged types as well as for Ada types deriving from a C++
5745 -- Class, but not for tagged types directly corresponding to C++ classes
5746 -- In the later case we assume that it is created in the C++ side and we
5749 if Is_Tagged_Type (Def_Id) then
5751 Static_Dispatch_Tables
5752 and then Is_Library_Level_Tagged_Type (Def_Id);
5754 -- Add the _Tag component
5756 if Underlying_Type (Etype (Def_Id)) = Def_Id then
5757 Expand_Tagged_Root (Def_Id);
5760 if Is_CPP_Class (Def_Id) then
5761 Set_All_DT_Position (Def_Id);
5762 Set_CPP_Constructors (Def_Id);
5764 -- Create the tag entities with a minimum decoration
5766 if Tagged_Type_Expansion then
5767 Append_Freeze_Actions (Def_Id, Make_Tags (Def_Id));
5771 if not Has_Static_DT then
5773 -- Usually inherited primitives are not delayed but the first
5774 -- Ada extension of a CPP_Class is an exception since the
5775 -- address of the inherited subprogram has to be inserted in
5776 -- the new Ada Dispatch Table and this is a freezing action.
5778 -- Similarly, if this is an inherited operation whose parent is
5779 -- not frozen yet, it is not in the DT of the parent, and we
5780 -- generate an explicit freeze node for the inherited operation
5781 -- so that it is properly inserted in the DT of the current
5785 Elmt : Elmt_Id := First_Elmt (Primitive_Operations (Def_Id));
5789 while Present (Elmt) loop
5790 Subp := Node (Elmt);
5792 if Present (Alias (Subp)) then
5793 if Is_CPP_Class (Etype (Def_Id)) then
5794 Set_Has_Delayed_Freeze (Subp);
5796 elsif Has_Delayed_Freeze (Alias (Subp))
5797 and then not Is_Frozen (Alias (Subp))
5799 Set_Is_Frozen (Subp, False);
5800 Set_Has_Delayed_Freeze (Subp);
5809 -- Unfreeze momentarily the type to add the predefined primitives
5810 -- operations. The reason we unfreeze is so that these predefined
5811 -- operations will indeed end up as primitive operations (which
5812 -- must be before the freeze point).
5814 Set_Is_Frozen (Def_Id, False);
5816 -- Do not add the spec of predefined primitives in case of
5817 -- CPP tagged type derivations that have convention CPP.
5819 if Is_CPP_Class (Root_Type (Def_Id))
5820 and then Convention (Def_Id) = Convention_CPP
5824 -- Do not add the spec of the predefined primitives if we are
5825 -- compiling under restriction No_Dispatching_Calls
5827 elsif not Restriction_Active (No_Dispatching_Calls) then
5828 Make_Predefined_Primitive_Specs
5829 (Def_Id, Predef_List, Renamed_Eq);
5830 Insert_List_Before_And_Analyze (N, Predef_List);
5833 -- Ada 2005 (AI-391): For a nonabstract null extension, create
5834 -- wrapper functions for each nonoverridden inherited function
5835 -- with a controlling result of the type. The wrapper for such
5836 -- a function returns an extension aggregate that invokes the
5837 -- the parent function.
5839 if Ada_Version >= Ada_05
5840 and then not Is_Abstract_Type (Def_Id)
5841 and then Is_Null_Extension (Def_Id)
5843 Make_Controlling_Function_Wrappers
5844 (Def_Id, Wrapper_Decl_List, Wrapper_Body_List);
5845 Insert_List_Before_And_Analyze (N, Wrapper_Decl_List);
5848 -- Ada 2005 (AI-251): For a nonabstract type extension, build
5849 -- null procedure declarations for each set of homographic null
5850 -- procedures that are inherited from interface types but not
5851 -- overridden. This is done to ensure that the dispatch table
5852 -- entry associated with such null primitives are properly filled.
5854 if Ada_Version >= Ada_05
5855 and then Etype (Def_Id) /= Def_Id
5856 and then not Is_Abstract_Type (Def_Id)
5858 Make_Null_Procedure_Specs (Def_Id, Null_Proc_Decl_List);
5859 Insert_Actions (N, Null_Proc_Decl_List);
5862 Set_Is_Frozen (Def_Id);
5863 Set_All_DT_Position (Def_Id);
5865 -- Add the controlled component before the freezing actions
5866 -- referenced in those actions.
5868 if Has_New_Controlled_Component (Def_Id) then
5869 Expand_Record_Controller (Def_Id);
5872 -- Create and decorate the tags. Suppress their creation when
5873 -- VM_Target because the dispatching mechanism is handled
5874 -- internally by the VMs.
5876 if Tagged_Type_Expansion then
5877 Append_Freeze_Actions (Def_Id, Make_Tags (Def_Id));
5879 -- Generate dispatch table of locally defined tagged type.
5880 -- Dispatch tables of library level tagged types are built
5881 -- later (see Analyze_Declarations).
5883 if not Has_Static_DT then
5884 Append_Freeze_Actions (Def_Id, Make_DT (Def_Id));
5888 -- If the type has unknown discriminants, propagate dispatching
5889 -- information to its underlying record view, which does not get
5890 -- its own dispatch table.
5892 if Is_Derived_Type (Def_Id)
5893 and then Has_Unknown_Discriminants (Def_Id)
5894 and then Present (Underlying_Record_View (Def_Id))
5897 Rep : constant Entity_Id :=
5898 Underlying_Record_View (Def_Id);
5900 Set_Access_Disp_Table
5901 (Rep, Access_Disp_Table (Def_Id));
5902 Set_Dispatch_Table_Wrappers
5903 (Rep, Dispatch_Table_Wrappers (Def_Id));
5904 Set_Primitive_Operations
5905 (Rep, Primitive_Operations (Def_Id));
5909 -- Make sure that the primitives Initialize, Adjust and Finalize
5910 -- are Frozen before other TSS subprograms. We don't want them
5913 if Is_Controlled (Def_Id) then
5914 if not Is_Limited_Type (Def_Id) then
5915 Append_Freeze_Actions (Def_Id,
5917 (Find_Prim_Op (Def_Id, Name_Adjust), Sloc (Def_Id)));
5920 Append_Freeze_Actions (Def_Id,
5922 (Find_Prim_Op (Def_Id, Name_Initialize), Sloc (Def_Id)));
5924 Append_Freeze_Actions (Def_Id,
5926 (Find_Prim_Op (Def_Id, Name_Finalize), Sloc (Def_Id)));
5929 -- Freeze rest of primitive operations. There is no need to handle
5930 -- the predefined primitives if we are compiling under restriction
5931 -- No_Dispatching_Calls
5933 if not Restriction_Active (No_Dispatching_Calls) then
5934 Append_Freeze_Actions
5935 (Def_Id, Predefined_Primitive_Freeze (Def_Id));
5939 -- In the non-tagged case, an equality function is provided only for
5940 -- variant records (that are not unchecked unions).
5942 elsif Has_Discriminants (Def_Id)
5943 and then not Is_Limited_Type (Def_Id)
5946 Comps : constant Node_Id :=
5947 Component_List (Type_Definition (Type_Decl));
5951 and then Present (Variant_Part (Comps))
5953 Build_Variant_Record_Equality (Def_Id);
5958 -- Before building the record initialization procedure, if we are
5959 -- dealing with a concurrent record value type, then we must go through
5960 -- the discriminants, exchanging discriminals between the concurrent
5961 -- type and the concurrent record value type. See the section "Handling
5962 -- of Discriminants" in the Einfo spec for details.
5964 if Is_Concurrent_Record_Type (Def_Id)
5965 and then Has_Discriminants (Def_Id)
5968 Ctyp : constant Entity_Id :=
5969 Corresponding_Concurrent_Type (Def_Id);
5970 Conc_Discr : Entity_Id;
5971 Rec_Discr : Entity_Id;
5975 Conc_Discr := First_Discriminant (Ctyp);
5976 Rec_Discr := First_Discriminant (Def_Id);
5978 while Present (Conc_Discr) loop
5979 Temp := Discriminal (Conc_Discr);
5980 Set_Discriminal (Conc_Discr, Discriminal (Rec_Discr));
5981 Set_Discriminal (Rec_Discr, Temp);
5983 Set_Discriminal_Link (Discriminal (Conc_Discr), Conc_Discr);
5984 Set_Discriminal_Link (Discriminal (Rec_Discr), Rec_Discr);
5986 Next_Discriminant (Conc_Discr);
5987 Next_Discriminant (Rec_Discr);
5992 if Has_Controlled_Component (Def_Id) then
5993 if No (Controller_Component (Def_Id)) then
5994 Expand_Record_Controller (Def_Id);
5997 Build_Controlling_Procs (Def_Id);
6000 Adjust_Discriminants (Def_Id);
6002 if Tagged_Type_Expansion or else not Is_Interface (Def_Id) then
6004 -- Do not need init for interfaces on e.g. CIL since they're
6005 -- abstract. Helps operation of peverify (the PE Verify tool).
6007 Build_Record_Init_Proc (Type_Decl, Def_Id);
6010 -- For tagged type that are not interfaces, build bodies of primitive
6011 -- operations. Note that we do this after building the record
6012 -- initialization procedure, since the primitive operations may need
6013 -- the initialization routine. There is no need to add predefined
6014 -- primitives of interfaces because all their predefined primitives
6017 if Is_Tagged_Type (Def_Id)
6018 and then not Is_Interface (Def_Id)
6020 -- Do not add the body of predefined primitives in case of
6021 -- CPP tagged type derivations that have convention CPP.
6023 if Is_CPP_Class (Root_Type (Def_Id))
6024 and then Convention (Def_Id) = Convention_CPP
6028 -- Do not add the body of the predefined primitives if we are
6029 -- compiling under restriction No_Dispatching_Calls or if we are
6030 -- compiling a CPP tagged type.
6032 elsif not Restriction_Active (No_Dispatching_Calls) then
6033 Predef_List := Predefined_Primitive_Bodies (Def_Id, Renamed_Eq);
6034 Append_Freeze_Actions (Def_Id, Predef_List);
6037 -- Ada 2005 (AI-391): If any wrappers were created for nonoverridden
6038 -- inherited functions, then add their bodies to the freeze actions.
6040 if Present (Wrapper_Body_List) then
6041 Append_Freeze_Actions (Def_Id, Wrapper_Body_List);
6044 -- Create extra formals for the primitive operations of the type.
6045 -- This must be done before analyzing the body of the initialization
6046 -- procedure, because a self-referential type might call one of these
6047 -- primitives in the body of the init_proc itself.
6054 Elmt := First_Elmt (Primitive_Operations (Def_Id));
6055 while Present (Elmt) loop
6056 Subp := Node (Elmt);
6057 if not Has_Foreign_Convention (Subp)
6058 and then not Is_Predefined_Dispatching_Operation (Subp)
6060 Create_Extra_Formals (Subp);
6067 end Expand_Freeze_Record_Type;
6069 ------------------------------
6070 -- Freeze_Stream_Operations --
6071 ------------------------------
6073 procedure Freeze_Stream_Operations (N : Node_Id; Typ : Entity_Id) is
6074 Names : constant array (1 .. 4) of TSS_Name_Type :=
6079 Stream_Op : Entity_Id;
6082 -- Primitive operations of tagged types are frozen when the dispatch
6083 -- table is constructed.
6085 if not Comes_From_Source (Typ)
6086 or else Is_Tagged_Type (Typ)
6091 for J in Names'Range loop
6092 Stream_Op := TSS (Typ, Names (J));
6094 if Present (Stream_Op)
6095 and then Is_Subprogram (Stream_Op)
6096 and then Nkind (Unit_Declaration_Node (Stream_Op)) =
6097 N_Subprogram_Declaration
6098 and then not Is_Frozen (Stream_Op)
6100 Append_Freeze_Actions
6101 (Typ, Freeze_Entity (Stream_Op, Sloc (N)));
6104 end Freeze_Stream_Operations;
6110 -- Full type declarations are expanded at the point at which the type is
6111 -- frozen. The formal N is the Freeze_Node for the type. Any statements or
6112 -- declarations generated by the freezing (e.g. the procedure generated
6113 -- for initialization) are chained in the Actions field list of the freeze
6114 -- node using Append_Freeze_Actions.
6116 function Freeze_Type (N : Node_Id) return Boolean is
6117 Def_Id : constant Entity_Id := Entity (N);
6118 RACW_Seen : Boolean := False;
6119 Result : Boolean := False;
6122 -- Process associated access types needing special processing
6124 if Present (Access_Types_To_Process (N)) then
6126 E : Elmt_Id := First_Elmt (Access_Types_To_Process (N));
6128 while Present (E) loop
6130 if Is_Remote_Access_To_Class_Wide_Type (Node (E)) then
6131 Validate_RACW_Primitives (Node (E));
6141 -- If there are RACWs designating this type, make stubs now
6143 Remote_Types_Tagged_Full_View_Encountered (Def_Id);
6147 -- Freeze processing for record types
6149 if Is_Record_Type (Def_Id) then
6150 if Ekind (Def_Id) = E_Record_Type then
6151 Expand_Freeze_Record_Type (N);
6153 -- The subtype may have been declared before the type was frozen. If
6154 -- the type has controlled components it is necessary to create the
6155 -- entity for the controller explicitly because it did not exist at
6156 -- the point of the subtype declaration. Only the entity is needed,
6157 -- the back-end will obtain the layout from the type. This is only
6158 -- necessary if this is constrained subtype whose component list is
6159 -- not shared with the base type.
6161 elsif Ekind (Def_Id) = E_Record_Subtype
6162 and then Has_Discriminants (Def_Id)
6163 and then Last_Entity (Def_Id) /= Last_Entity (Base_Type (Def_Id))
6164 and then Present (Controller_Component (Def_Id))
6167 Old_C : constant Entity_Id := Controller_Component (Def_Id);
6171 if Scope (Old_C) = Base_Type (Def_Id) then
6173 -- The entity is the one in the parent. Create new one
6175 New_C := New_Copy (Old_C);
6176 Set_Parent (New_C, Parent (Old_C));
6177 Push_Scope (Def_Id);
6183 if Is_Itype (Def_Id)
6184 and then Is_Record_Type (Underlying_Type (Scope (Def_Id)))
6186 -- The freeze node is only used to introduce the controller,
6187 -- the back-end has no use for it for a discriminated
6190 Set_Freeze_Node (Def_Id, Empty);
6191 Set_Has_Delayed_Freeze (Def_Id, False);
6195 -- Similar process if the controller of the subtype is not present
6196 -- but the parent has it. This can happen with constrained
6197 -- record components where the subtype is an itype.
6199 elsif Ekind (Def_Id) = E_Record_Subtype
6200 and then Is_Itype (Def_Id)
6201 and then No (Controller_Component (Def_Id))
6202 and then Present (Controller_Component (Etype (Def_Id)))
6205 Old_C : constant Entity_Id :=
6206 Controller_Component (Etype (Def_Id));
6207 New_C : constant Entity_Id := New_Copy (Old_C);
6210 Set_Next_Entity (New_C, First_Entity (Def_Id));
6211 Set_First_Entity (Def_Id, New_C);
6213 -- The freeze node is only used to introduce the controller,
6214 -- the back-end has no use for it for a discriminated
6217 Set_Freeze_Node (Def_Id, Empty);
6218 Set_Has_Delayed_Freeze (Def_Id, False);
6223 -- Freeze processing for array types
6225 elsif Is_Array_Type (Def_Id) then
6226 Expand_Freeze_Array_Type (N);
6228 -- Freeze processing for access types
6230 -- For pool-specific access types, find out the pool object used for
6231 -- this type, needs actual expansion of it in some cases. Here are the
6232 -- different cases :
6234 -- 1. Rep Clause "for Def_Id'Storage_Size use 0;"
6235 -- ---> don't use any storage pool
6237 -- 2. Rep Clause : for Def_Id'Storage_Size use Expr.
6239 -- Def_Id__Pool : Stack_Bounded_Pool (Expr, DT'Size, DT'Alignment);
6241 -- 3. Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
6242 -- ---> Storage Pool is the specified one
6244 -- See GNAT Pool packages in the Run-Time for more details
6246 elsif Ekind (Def_Id) = E_Access_Type
6247 or else Ekind (Def_Id) = E_General_Access_Type
6250 Loc : constant Source_Ptr := Sloc (N);
6251 Desig_Type : constant Entity_Id := Designated_Type (Def_Id);
6252 Pool_Object : Entity_Id;
6254 Freeze_Action_Typ : Entity_Id;
6259 -- Rep Clause "for Def_Id'Storage_Size use 0;"
6260 -- ---> don't use any storage pool
6262 if No_Pool_Assigned (Def_Id) then
6267 -- Rep Clause : for Def_Id'Storage_Size use Expr.
6269 -- Def_Id__Pool : Stack_Bounded_Pool
6270 -- (Expr, DT'Size, DT'Alignment);
6272 elsif Has_Storage_Size_Clause (Def_Id) then
6278 -- For unconstrained composite types we give a size of zero
6279 -- so that the pool knows that it needs a special algorithm
6280 -- for variable size object allocation.
6282 if Is_Composite_Type (Desig_Type)
6283 and then not Is_Constrained (Desig_Type)
6286 Make_Integer_Literal (Loc, 0);
6289 Make_Integer_Literal (Loc, Maximum_Alignment);
6293 Make_Attribute_Reference (Loc,
6294 Prefix => New_Reference_To (Desig_Type, Loc),
6295 Attribute_Name => Name_Max_Size_In_Storage_Elements);
6298 Make_Attribute_Reference (Loc,
6299 Prefix => New_Reference_To (Desig_Type, Loc),
6300 Attribute_Name => Name_Alignment);
6304 Make_Defining_Identifier (Loc,
6305 Chars => New_External_Name (Chars (Def_Id), 'P'));
6307 -- We put the code associated with the pools in the entity
6308 -- that has the later freeze node, usually the access type
6309 -- but it can also be the designated_type; because the pool
6310 -- code requires both those types to be frozen
6312 if Is_Frozen (Desig_Type)
6313 and then (No (Freeze_Node (Desig_Type))
6314 or else Analyzed (Freeze_Node (Desig_Type)))
6316 Freeze_Action_Typ := Def_Id;
6318 -- A Taft amendment type cannot get the freeze actions
6319 -- since the full view is not there.
6321 elsif Is_Incomplete_Or_Private_Type (Desig_Type)
6322 and then No (Full_View (Desig_Type))
6324 Freeze_Action_Typ := Def_Id;
6327 Freeze_Action_Typ := Desig_Type;
6330 Append_Freeze_Action (Freeze_Action_Typ,
6331 Make_Object_Declaration (Loc,
6332 Defining_Identifier => Pool_Object,
6333 Object_Definition =>
6334 Make_Subtype_Indication (Loc,
6337 (RTE (RE_Stack_Bounded_Pool), Loc),
6340 Make_Index_Or_Discriminant_Constraint (Loc,
6341 Constraints => New_List (
6343 -- First discriminant is the Pool Size
6346 Storage_Size_Variable (Def_Id), Loc),
6348 -- Second discriminant is the element size
6352 -- Third discriminant is the alignment
6357 Set_Associated_Storage_Pool (Def_Id, Pool_Object);
6361 -- Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
6362 -- ---> Storage Pool is the specified one
6364 elsif Present (Associated_Storage_Pool (Def_Id)) then
6366 -- Nothing to do the associated storage pool has been attached
6367 -- when analyzing the rep. clause
6372 -- For access-to-controlled types (including class-wide types and
6373 -- Taft-amendment types which potentially have controlled
6374 -- components), expand the list controller object that will store
6375 -- the dynamically allocated objects. Do not do this
6376 -- transformation for expander-generated access types, but do it
6377 -- for types that are the full view of types derived from other
6378 -- private types. Also suppress the list controller in the case
6379 -- of a designated type with convention Java, since this is used
6380 -- when binding to Java API specs, where there's no equivalent of
6381 -- a finalization list and we don't want to pull in the
6382 -- finalization support if not needed.
6384 if not Comes_From_Source (Def_Id)
6385 and then not Has_Private_Declaration (Def_Id)
6389 elsif (Needs_Finalization (Desig_Type)
6390 and then Convention (Desig_Type) /= Convention_Java
6391 and then Convention (Desig_Type) /= Convention_CIL)
6393 (Is_Incomplete_Or_Private_Type (Desig_Type)
6394 and then No (Full_View (Desig_Type))
6396 -- An exception is made for types defined in the run-time
6397 -- because Ada.Tags.Tag itself is such a type and cannot
6398 -- afford this unnecessary overhead that would generates a
6399 -- loop in the expansion scheme...
6401 and then not In_Runtime (Def_Id)
6403 -- Another exception is if Restrictions (No_Finalization)
6404 -- is active, since then we know nothing is controlled.
6406 and then not Restriction_Active (No_Finalization))
6408 -- If the designated type is not frozen yet, its controlled
6409 -- status must be retrieved explicitly.
6411 or else (Is_Array_Type (Desig_Type)
6412 and then not Is_Frozen (Desig_Type)
6413 and then Needs_Finalization (Component_Type (Desig_Type)))
6415 -- The designated type has controlled anonymous access
6418 or else Has_Controlled_Coextensions (Desig_Type)
6420 Set_Associated_Final_Chain (Def_Id, Add_Final_Chain (Def_Id));
6424 -- Freeze processing for enumeration types
6426 elsif Ekind (Def_Id) = E_Enumeration_Type then
6428 -- We only have something to do if we have a non-standard
6429 -- representation (i.e. at least one literal whose pos value
6430 -- is not the same as its representation)
6432 if Has_Non_Standard_Rep (Def_Id) then
6433 Expand_Freeze_Enumeration_Type (N);
6436 -- Private types that are completed by a derivation from a private
6437 -- type have an internally generated full view, that needs to be
6438 -- frozen. This must be done explicitly because the two views share
6439 -- the freeze node, and the underlying full view is not visible when
6440 -- the freeze node is analyzed.
6442 elsif Is_Private_Type (Def_Id)
6443 and then Is_Derived_Type (Def_Id)
6444 and then Present (Full_View (Def_Id))
6445 and then Is_Itype (Full_View (Def_Id))
6446 and then Has_Private_Declaration (Full_View (Def_Id))
6447 and then Freeze_Node (Full_View (Def_Id)) = N
6449 Set_Entity (N, Full_View (Def_Id));
6450 Result := Freeze_Type (N);
6451 Set_Entity (N, Def_Id);
6453 -- All other types require no expander action. There are such cases
6454 -- (e.g. task types and protected types). In such cases, the freeze
6455 -- nodes are there for use by Gigi.
6459 Freeze_Stream_Operations (N, Def_Id);
6463 when RE_Not_Available =>
6467 -------------------------
6468 -- Get_Simple_Init_Val --
6469 -------------------------
6471 function Get_Simple_Init_Val
6474 Size : Uint := No_Uint) return Node_Id
6476 Loc : constant Source_Ptr := Sloc (N);
6482 -- This is the size to be used for computation of the appropriate
6483 -- initial value for the Normalize_Scalars and Initialize_Scalars case.
6485 IV_Attribute : constant Boolean :=
6486 Nkind (N) = N_Attribute_Reference
6487 and then Attribute_Name (N) = Name_Invalid_Value;
6491 -- These are the values computed by the procedure Check_Subtype_Bounds
6493 procedure Check_Subtype_Bounds;
6494 -- This procedure examines the subtype T, and its ancestor subtypes and
6495 -- derived types to determine the best known information about the
6496 -- bounds of the subtype. After the call Lo_Bound is set either to
6497 -- No_Uint if no information can be determined, or to a value which
6498 -- represents a known low bound, i.e. a valid value of the subtype can
6499 -- not be less than this value. Hi_Bound is similarly set to a known
6500 -- high bound (valid value cannot be greater than this).
6502 --------------------------
6503 -- Check_Subtype_Bounds --
6504 --------------------------
6506 procedure Check_Subtype_Bounds is
6515 Lo_Bound := No_Uint;
6516 Hi_Bound := No_Uint;
6518 -- Loop to climb ancestor subtypes and derived types
6522 if not Is_Discrete_Type (ST1) then
6526 Lo := Type_Low_Bound (ST1);
6527 Hi := Type_High_Bound (ST1);
6529 if Compile_Time_Known_Value (Lo) then
6530 Loval := Expr_Value (Lo);
6532 if Lo_Bound = No_Uint or else Lo_Bound < Loval then
6537 if Compile_Time_Known_Value (Hi) then
6538 Hival := Expr_Value (Hi);
6540 if Hi_Bound = No_Uint or else Hi_Bound > Hival then
6545 ST2 := Ancestor_Subtype (ST1);
6551 exit when ST1 = ST2;
6554 end Check_Subtype_Bounds;
6556 -- Start of processing for Get_Simple_Init_Val
6559 -- For a private type, we should always have an underlying type
6560 -- (because this was already checked in Needs_Simple_Initialization).
6561 -- What we do is to get the value for the underlying type and then do
6562 -- an Unchecked_Convert to the private type.
6564 if Is_Private_Type (T) then
6565 Val := Get_Simple_Init_Val (Underlying_Type (T), N, Size);
6567 -- A special case, if the underlying value is null, then qualify it
6568 -- with the underlying type, so that the null is properly typed
6569 -- Similarly, if it is an aggregate it must be qualified, because an
6570 -- unchecked conversion does not provide a context for it.
6572 if Nkind_In (Val, N_Null, N_Aggregate) then
6574 Make_Qualified_Expression (Loc,
6576 New_Occurrence_Of (Underlying_Type (T), Loc),
6580 Result := Unchecked_Convert_To (T, Val);
6582 -- Don't truncate result (important for Initialize/Normalize_Scalars)
6584 if Nkind (Result) = N_Unchecked_Type_Conversion
6585 and then Is_Scalar_Type (Underlying_Type (T))
6587 Set_No_Truncation (Result);
6592 -- For scalars, we must have normalize/initialize scalars case, or
6593 -- if the node N is an 'Invalid_Value attribute node.
6595 elsif Is_Scalar_Type (T) then
6596 pragma Assert (Init_Or_Norm_Scalars or IV_Attribute);
6598 -- Compute size of object. If it is given by the caller, we can use
6599 -- it directly, otherwise we use Esize (T) as an estimate. As far as
6600 -- we know this covers all cases correctly.
6602 if Size = No_Uint or else Size <= Uint_0 then
6603 Size_To_Use := UI_Max (Uint_1, Esize (T));
6605 Size_To_Use := Size;
6608 -- Maximum size to use is 64 bits, since we will create values
6609 -- of type Unsigned_64 and the range must fit this type.
6611 if Size_To_Use /= No_Uint and then Size_To_Use > Uint_64 then
6612 Size_To_Use := Uint_64;
6615 -- Check known bounds of subtype
6617 Check_Subtype_Bounds;
6619 -- Processing for Normalize_Scalars case
6621 if Normalize_Scalars and then not IV_Attribute then
6623 -- If zero is invalid, it is a convenient value to use that is
6624 -- for sure an appropriate invalid value in all situations.
6626 if Lo_Bound /= No_Uint and then Lo_Bound > Uint_0 then
6627 Val := Make_Integer_Literal (Loc, 0);
6629 -- Cases where all one bits is the appropriate invalid value
6631 -- For modular types, all 1 bits is either invalid or valid. If
6632 -- it is valid, then there is nothing that can be done since there
6633 -- are no invalid values (we ruled out zero already).
6635 -- For signed integer types that have no negative values, either
6636 -- there is room for negative values, or there is not. If there
6637 -- is, then all 1 bits may be interpreted as minus one, which is
6638 -- certainly invalid. Alternatively it is treated as the largest
6639 -- positive value, in which case the observation for modular types
6642 -- For float types, all 1-bits is a NaN (not a number), which is
6643 -- certainly an appropriately invalid value.
6645 elsif Is_Unsigned_Type (T)
6646 or else Is_Floating_Point_Type (T)
6647 or else Is_Enumeration_Type (T)
6649 Val := Make_Integer_Literal (Loc, 2 ** Size_To_Use - 1);
6651 -- Resolve as Unsigned_64, because the largest number we
6652 -- can generate is out of range of universal integer.
6654 Analyze_And_Resolve (Val, RTE (RE_Unsigned_64));
6656 -- Case of signed types
6660 Signed_Size : constant Uint :=
6661 UI_Min (Uint_63, Size_To_Use - 1);
6664 -- Normally we like to use the most negative number. The
6665 -- one exception is when this number is in the known
6666 -- subtype range and the largest positive number is not in
6667 -- the known subtype range.
6669 -- For this exceptional case, use largest positive value
6671 if Lo_Bound /= No_Uint and then Hi_Bound /= No_Uint
6672 and then Lo_Bound <= (-(2 ** Signed_Size))
6673 and then Hi_Bound < 2 ** Signed_Size
6675 Val := Make_Integer_Literal (Loc, 2 ** Signed_Size - 1);
6677 -- Normal case of largest negative value
6680 Val := Make_Integer_Literal (Loc, -(2 ** Signed_Size));
6685 -- Here for Initialize_Scalars case (or Invalid_Value attribute used)
6688 -- For float types, use float values from System.Scalar_Values
6690 if Is_Floating_Point_Type (T) then
6691 if Root_Type (T) = Standard_Short_Float then
6692 Val_RE := RE_IS_Isf;
6693 elsif Root_Type (T) = Standard_Float then
6694 Val_RE := RE_IS_Ifl;
6695 elsif Root_Type (T) = Standard_Long_Float then
6696 Val_RE := RE_IS_Ilf;
6697 else pragma Assert (Root_Type (T) = Standard_Long_Long_Float);
6698 Val_RE := RE_IS_Ill;
6701 -- If zero is invalid, use zero values from System.Scalar_Values
6703 elsif Lo_Bound /= No_Uint and then Lo_Bound > Uint_0 then
6704 if Size_To_Use <= 8 then
6705 Val_RE := RE_IS_Iz1;
6706 elsif Size_To_Use <= 16 then
6707 Val_RE := RE_IS_Iz2;
6708 elsif Size_To_Use <= 32 then
6709 Val_RE := RE_IS_Iz4;
6711 Val_RE := RE_IS_Iz8;
6714 -- For unsigned, use unsigned values from System.Scalar_Values
6716 elsif Is_Unsigned_Type (T) then
6717 if Size_To_Use <= 8 then
6718 Val_RE := RE_IS_Iu1;
6719 elsif Size_To_Use <= 16 then
6720 Val_RE := RE_IS_Iu2;
6721 elsif Size_To_Use <= 32 then
6722 Val_RE := RE_IS_Iu4;
6724 Val_RE := RE_IS_Iu8;
6727 -- For signed, use signed values from System.Scalar_Values
6730 if Size_To_Use <= 8 then
6731 Val_RE := RE_IS_Is1;
6732 elsif Size_To_Use <= 16 then
6733 Val_RE := RE_IS_Is2;
6734 elsif Size_To_Use <= 32 then
6735 Val_RE := RE_IS_Is4;
6737 Val_RE := RE_IS_Is8;
6741 Val := New_Occurrence_Of (RTE (Val_RE), Loc);
6744 -- The final expression is obtained by doing an unchecked conversion
6745 -- of this result to the base type of the required subtype. We use
6746 -- the base type to avoid the unchecked conversion from chopping
6747 -- bits, and then we set Kill_Range_Check to preserve the "bad"
6750 Result := Unchecked_Convert_To (Base_Type (T), Val);
6752 -- Ensure result is not truncated, since we want the "bad" bits
6753 -- and also kill range check on result.
6755 if Nkind (Result) = N_Unchecked_Type_Conversion then
6756 Set_No_Truncation (Result);
6757 Set_Kill_Range_Check (Result, True);
6762 -- String or Wide_[Wide]_String (must have Initialize_Scalars set)
6764 elsif Root_Type (T) = Standard_String
6766 Root_Type (T) = Standard_Wide_String
6768 Root_Type (T) = Standard_Wide_Wide_String
6770 pragma Assert (Init_Or_Norm_Scalars);
6773 Make_Aggregate (Loc,
6774 Component_Associations => New_List (
6775 Make_Component_Association (Loc,
6776 Choices => New_List (
6777 Make_Others_Choice (Loc)),
6780 (Component_Type (T), N, Esize (Root_Type (T))))));
6782 -- Access type is initialized to null
6784 elsif Is_Access_Type (T) then
6788 -- No other possibilities should arise, since we should only be
6789 -- calling Get_Simple_Init_Val if Needs_Simple_Initialization
6790 -- returned True, indicating one of the above cases held.
6793 raise Program_Error;
6797 when RE_Not_Available =>
6799 end Get_Simple_Init_Val;
6801 ------------------------------
6802 -- Has_New_Non_Standard_Rep --
6803 ------------------------------
6805 function Has_New_Non_Standard_Rep (T : Entity_Id) return Boolean is
6807 if not Is_Derived_Type (T) then
6808 return Has_Non_Standard_Rep (T)
6809 or else Has_Non_Standard_Rep (Root_Type (T));
6811 -- If Has_Non_Standard_Rep is not set on the derived type, the
6812 -- representation is fully inherited.
6814 elsif not Has_Non_Standard_Rep (T) then
6818 return First_Rep_Item (T) /= First_Rep_Item (Root_Type (T));
6820 -- May need a more precise check here: the First_Rep_Item may
6821 -- be a stream attribute, which does not affect the representation
6824 end Has_New_Non_Standard_Rep;
6830 function In_Runtime (E : Entity_Id) return Boolean is
6835 while Scope (S1) /= Standard_Standard loop
6839 return Chars (S1) = Name_System or else Chars (S1) = Name_Ada;
6842 ----------------------------
6843 -- Initialization_Warning --
6844 ----------------------------
6846 procedure Initialization_Warning (E : Entity_Id) is
6847 Warning_Needed : Boolean;
6850 Warning_Needed := False;
6852 if Ekind (Current_Scope) = E_Package
6853 and then Static_Elaboration_Desired (Current_Scope)
6856 if Is_Record_Type (E) then
6857 if Has_Discriminants (E)
6858 or else Is_Limited_Type (E)
6859 or else Has_Non_Standard_Rep (E)
6861 Warning_Needed := True;
6864 -- Verify that at least one component has an initialization
6865 -- expression. No need for a warning on a type if all its
6866 -- components have no initialization.
6872 Comp := First_Component (E);
6873 while Present (Comp) loop
6874 if Ekind (Comp) = E_Discriminant
6876 (Nkind (Parent (Comp)) = N_Component_Declaration
6877 and then Present (Expression (Parent (Comp))))
6879 Warning_Needed := True;
6883 Next_Component (Comp);
6888 if Warning_Needed then
6890 ("Objects of the type cannot be initialized " &
6891 "statically by default?",
6897 Error_Msg_N ("Object cannot be initialized statically?", E);
6900 end Initialization_Warning;
6906 function Init_Formals (Typ : Entity_Id) return List_Id is
6907 Loc : constant Source_Ptr := Sloc (Typ);
6911 -- First parameter is always _Init : in out typ. Note that we need
6912 -- this to be in/out because in the case of the task record value,
6913 -- there are default record fields (_Priority, _Size, -Task_Info)
6914 -- that may be referenced in the generated initialization routine.
6916 Formals := New_List (
6917 Make_Parameter_Specification (Loc,
6918 Defining_Identifier =>
6919 Make_Defining_Identifier (Loc, Name_uInit),
6921 Out_Present => True,
6922 Parameter_Type => New_Reference_To (Typ, Loc)));
6924 -- For task record value, or type that contains tasks, add two more
6925 -- formals, _Master : Master_Id and _Chain : in out Activation_Chain
6926 -- We also add these parameters for the task record type case.
6929 or else (Is_Record_Type (Typ) and then Is_Task_Record_Type (Typ))
6932 Make_Parameter_Specification (Loc,
6933 Defining_Identifier =>
6934 Make_Defining_Identifier (Loc, Name_uMaster),
6935 Parameter_Type => New_Reference_To (RTE (RE_Master_Id), Loc)));
6938 Make_Parameter_Specification (Loc,
6939 Defining_Identifier =>
6940 Make_Defining_Identifier (Loc, Name_uChain),
6942 Out_Present => True,
6944 New_Reference_To (RTE (RE_Activation_Chain), Loc)));
6947 Make_Parameter_Specification (Loc,
6948 Defining_Identifier =>
6949 Make_Defining_Identifier (Loc, Name_uTask_Name),
6952 New_Reference_To (Standard_String, Loc)));
6958 when RE_Not_Available =>
6962 -------------------------
6963 -- Init_Secondary_Tags --
6964 -------------------------
6966 procedure Init_Secondary_Tags
6969 Stmts_List : List_Id;
6970 Fixed_Comps : Boolean := True;
6971 Variable_Comps : Boolean := True)
6973 Loc : constant Source_Ptr := Sloc (Target);
6975 procedure Inherit_CPP_Tag
6978 Tag_Comp : Entity_Id;
6979 Iface_Tag : Node_Id);
6980 -- Inherit the C++ tag of the secondary dispatch table of Typ associated
6981 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6983 procedure Initialize_Tag
6986 Tag_Comp : Entity_Id;
6987 Iface_Tag : Node_Id);
6988 -- Initialize the tag of the secondary dispatch table of Typ associated
6989 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6990 -- Compiling under the CPP full ABI compatibility mode, if the ancestor
6991 -- of Typ CPP tagged type we generate code to inherit the contents of
6992 -- the dispatch table directly from the ancestor.
6994 ---------------------
6995 -- Inherit_CPP_Tag --
6996 ---------------------
6998 procedure Inherit_CPP_Tag
7001 Tag_Comp : Entity_Id;
7002 Iface_Tag : Node_Id)
7005 pragma Assert (Is_CPP_Class (Etype (Typ)));
7007 Append_To (Stmts_List,
7008 Build_Inherit_Prims (Loc,
7011 Make_Selected_Component (Loc,
7012 Prefix => New_Copy_Tree (Target),
7013 Selector_Name => New_Reference_To (Tag_Comp, Loc)),
7015 New_Reference_To (Iface_Tag, Loc),
7017 UI_To_Int (DT_Entry_Count (First_Tag_Component (Iface)))));
7018 end Inherit_CPP_Tag;
7020 --------------------
7021 -- Initialize_Tag --
7022 --------------------
7024 procedure Initialize_Tag
7027 Tag_Comp : Entity_Id;
7028 Iface_Tag : Node_Id)
7030 Comp_Typ : Entity_Id;
7031 Offset_To_Top_Comp : Entity_Id := Empty;
7034 -- Initialize the pointer to the secondary DT associated with the
7037 if not Is_Ancestor (Iface, Typ) then
7038 Append_To (Stmts_List,
7039 Make_Assignment_Statement (Loc,
7041 Make_Selected_Component (Loc,
7042 Prefix => New_Copy_Tree (Target),
7043 Selector_Name => New_Reference_To (Tag_Comp, Loc)),
7045 New_Reference_To (Iface_Tag, Loc)));
7048 Comp_Typ := Scope (Tag_Comp);
7050 -- Initialize the entries of the table of interfaces. We generate a
7051 -- different call when the parent of the type has variable size
7054 if Comp_Typ /= Etype (Comp_Typ)
7055 and then Is_Variable_Size_Record (Etype (Comp_Typ))
7056 and then Chars (Tag_Comp) /= Name_uTag
7058 pragma Assert (Present (DT_Offset_To_Top_Func (Tag_Comp)));
7060 -- Issue error if Set_Dynamic_Offset_To_Top is not available in a
7061 -- configurable run-time environment.
7063 if not RTE_Available (RE_Set_Dynamic_Offset_To_Top) then
7065 ("variable size record with interface types", Typ);
7070 -- Set_Dynamic_Offset_To_Top
7072 -- Interface_T => Iface'Tag,
7073 -- Offset_Value => n,
7074 -- Offset_Func => Fn'Address)
7076 Append_To (Stmts_List,
7077 Make_Procedure_Call_Statement (Loc,
7078 Name => New_Reference_To
7079 (RTE (RE_Set_Dynamic_Offset_To_Top), Loc),
7080 Parameter_Associations => New_List (
7081 Make_Attribute_Reference (Loc,
7082 Prefix => New_Copy_Tree (Target),
7083 Attribute_Name => Name_Address),
7085 Unchecked_Convert_To (RTE (RE_Tag),
7087 (Node (First_Elmt (Access_Disp_Table (Iface))),
7090 Unchecked_Convert_To
7091 (RTE (RE_Storage_Offset),
7092 Make_Attribute_Reference (Loc,
7094 Make_Selected_Component (Loc,
7095 Prefix => New_Copy_Tree (Target),
7097 New_Reference_To (Tag_Comp, Loc)),
7098 Attribute_Name => Name_Position)),
7100 Unchecked_Convert_To (RTE (RE_Offset_To_Top_Function_Ptr),
7101 Make_Attribute_Reference (Loc,
7102 Prefix => New_Reference_To
7103 (DT_Offset_To_Top_Func (Tag_Comp), Loc),
7104 Attribute_Name => Name_Address)))));
7106 -- In this case the next component stores the value of the
7107 -- offset to the top.
7109 Offset_To_Top_Comp := Next_Entity (Tag_Comp);
7110 pragma Assert (Present (Offset_To_Top_Comp));
7112 Append_To (Stmts_List,
7113 Make_Assignment_Statement (Loc,
7115 Make_Selected_Component (Loc,
7116 Prefix => New_Copy_Tree (Target),
7117 Selector_Name => New_Reference_To
7118 (Offset_To_Top_Comp, Loc)),
7120 Make_Attribute_Reference (Loc,
7122 Make_Selected_Component (Loc,
7123 Prefix => New_Copy_Tree (Target),
7125 New_Reference_To (Tag_Comp, Loc)),
7126 Attribute_Name => Name_Position)));
7128 -- Normal case: No discriminants in the parent type
7131 -- Don't need to set any value if this interface shares
7132 -- the primary dispatch table.
7134 if not Is_Ancestor (Iface, Typ) then
7135 Append_To (Stmts_List,
7136 Build_Set_Static_Offset_To_Top (Loc,
7137 Iface_Tag => New_Reference_To (Iface_Tag, Loc),
7139 Unchecked_Convert_To (RTE (RE_Storage_Offset),
7140 Make_Attribute_Reference (Loc,
7142 Make_Selected_Component (Loc,
7143 Prefix => New_Copy_Tree (Target),
7145 New_Reference_To (Tag_Comp, Loc)),
7146 Attribute_Name => Name_Position))));
7150 -- Register_Interface_Offset
7152 -- Interface_T => Iface'Tag,
7153 -- Is_Constant => True,
7154 -- Offset_Value => n,
7155 -- Offset_Func => null);
7157 if RTE_Available (RE_Register_Interface_Offset) then
7158 Append_To (Stmts_List,
7159 Make_Procedure_Call_Statement (Loc,
7160 Name => New_Reference_To
7161 (RTE (RE_Register_Interface_Offset), Loc),
7162 Parameter_Associations => New_List (
7163 Make_Attribute_Reference (Loc,
7164 Prefix => New_Copy_Tree (Target),
7165 Attribute_Name => Name_Address),
7167 Unchecked_Convert_To (RTE (RE_Tag),
7169 (Node (First_Elmt (Access_Disp_Table (Iface))), Loc)),
7171 New_Occurrence_Of (Standard_True, Loc),
7173 Unchecked_Convert_To
7174 (RTE (RE_Storage_Offset),
7175 Make_Attribute_Reference (Loc,
7177 Make_Selected_Component (Loc,
7178 Prefix => New_Copy_Tree (Target),
7180 New_Reference_To (Tag_Comp, Loc)),
7181 Attribute_Name => Name_Position)),
7190 Full_Typ : Entity_Id;
7191 Ifaces_List : Elist_Id;
7192 Ifaces_Comp_List : Elist_Id;
7193 Ifaces_Tag_List : Elist_Id;
7194 Iface_Elmt : Elmt_Id;
7195 Iface_Comp_Elmt : Elmt_Id;
7196 Iface_Tag_Elmt : Elmt_Id;
7198 In_Variable_Pos : Boolean;
7200 -- Start of processing for Init_Secondary_Tags
7203 -- Handle private types
7205 if Present (Full_View (Typ)) then
7206 Full_Typ := Full_View (Typ);
7211 Collect_Interfaces_Info
7212 (Full_Typ, Ifaces_List, Ifaces_Comp_List, Ifaces_Tag_List);
7214 Iface_Elmt := First_Elmt (Ifaces_List);
7215 Iface_Comp_Elmt := First_Elmt (Ifaces_Comp_List);
7216 Iface_Tag_Elmt := First_Elmt (Ifaces_Tag_List);
7217 while Present (Iface_Elmt) loop
7218 Tag_Comp := Node (Iface_Comp_Elmt);
7220 -- If we are compiling under the CPP full ABI compatibility mode and
7221 -- the ancestor is a CPP_Pragma tagged type then we generate code to
7222 -- inherit the contents of the dispatch table directly from the
7225 if Is_CPP_Class (Etype (Full_Typ)) then
7226 Inherit_CPP_Tag (Full_Typ,
7227 Iface => Node (Iface_Elmt),
7228 Tag_Comp => Tag_Comp,
7229 Iface_Tag => Node (Iface_Tag_Elmt));
7231 -- Otherwise generate code to initialize the tag
7234 -- Check if the parent of the record type has variable size
7237 In_Variable_Pos := Scope (Tag_Comp) /= Etype (Scope (Tag_Comp))
7238 and then Is_Variable_Size_Record (Etype (Scope (Tag_Comp)));
7240 if (In_Variable_Pos and then Variable_Comps)
7241 or else (not In_Variable_Pos and then Fixed_Comps)
7243 Initialize_Tag (Full_Typ,
7244 Iface => Node (Iface_Elmt),
7245 Tag_Comp => Tag_Comp,
7246 Iface_Tag => Node (Iface_Tag_Elmt));
7250 Next_Elmt (Iface_Elmt);
7251 Next_Elmt (Iface_Comp_Elmt);
7252 Next_Elmt (Iface_Tag_Elmt);
7254 end Init_Secondary_Tags;
7256 -----------------------------
7257 -- Is_Variable_Size_Record --
7258 -----------------------------
7260 function Is_Variable_Size_Record (E : Entity_Id) return Boolean is
7262 Comp_Typ : Entity_Id;
7265 function Is_Constant_Bound (Exp : Node_Id) return Boolean;
7266 -- To simplify handling of array components. Determines whether the
7267 -- given bound is constant (a constant or enumeration literal, or an
7268 -- integer literal) as opposed to per-object, through an expression
7269 -- or a discriminant.
7271 -----------------------
7272 -- Is_Constant_Bound --
7273 -----------------------
7275 function Is_Constant_Bound (Exp : Node_Id) return Boolean is
7277 if Nkind (Exp) = N_Integer_Literal then
7281 Is_Entity_Name (Exp)
7282 and then Present (Entity (Exp))
7284 (Ekind (Entity (Exp)) = E_Constant
7285 or else Ekind (Entity (Exp)) = E_Enumeration_Literal);
7287 end Is_Constant_Bound;
7289 -- Start of processing for Is_Variable_Sized_Record
7292 pragma Assert (Is_Record_Type (E));
7294 Comp := First_Entity (E);
7295 while Present (Comp) loop
7296 Comp_Typ := Etype (Comp);
7298 if Is_Record_Type (Comp_Typ) then
7300 -- Recursive call if the record type has discriminants
7302 if Has_Discriminants (Comp_Typ)
7303 and then Is_Variable_Size_Record (Comp_Typ)
7308 elsif Is_Array_Type (Comp_Typ) then
7310 -- Check if some index is initialized with a non-constant value
7312 Idx := First_Index (Comp_Typ);
7313 while Present (Idx) loop
7314 if Nkind (Idx) = N_Range then
7315 if not Is_Constant_Bound (Low_Bound (Idx))
7317 not Is_Constant_Bound (High_Bound (Idx))
7323 Idx := Next_Index (Idx);
7331 end Is_Variable_Size_Record;
7333 ----------------------------------------
7334 -- Make_Controlling_Function_Wrappers --
7335 ----------------------------------------
7337 procedure Make_Controlling_Function_Wrappers
7338 (Tag_Typ : Entity_Id;
7339 Decl_List : out List_Id;
7340 Body_List : out List_Id)
7342 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7343 Prim_Elmt : Elmt_Id;
7345 Actual_List : List_Id;
7346 Formal_List : List_Id;
7348 Par_Formal : Entity_Id;
7349 Formal_Node : Node_Id;
7350 Func_Body : Node_Id;
7351 Func_Decl : Node_Id;
7352 Func_Spec : Node_Id;
7353 Return_Stmt : Node_Id;
7356 Decl_List := New_List;
7357 Body_List := New_List;
7359 Prim_Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
7361 while Present (Prim_Elmt) loop
7362 Subp := Node (Prim_Elmt);
7364 -- If a primitive function with a controlling result of the type has
7365 -- not been overridden by the user, then we must create a wrapper
7366 -- function here that effectively overrides it and invokes the
7367 -- (non-abstract) parent function. This can only occur for a null
7368 -- extension. Note that functions with anonymous controlling access
7369 -- results don't qualify and must be overridden. We also exclude
7370 -- Input attributes, since each type will have its own version of
7371 -- Input constructed by the expander. The test for Comes_From_Source
7372 -- is needed to distinguish inherited operations from renamings
7373 -- (which also have Alias set).
7375 -- The function may be abstract, or require_Overriding may be set
7376 -- for it, because tests for null extensions may already have reset
7377 -- the Is_Abstract_Subprogram_Flag. If Requires_Overriding is not
7378 -- set, functions that need wrappers are recognized by having an
7379 -- alias that returns the parent type.
7381 if Comes_From_Source (Subp)
7382 or else No (Alias (Subp))
7383 or else Ekind (Subp) /= E_Function
7384 or else not Has_Controlling_Result (Subp)
7385 or else Is_Access_Type (Etype (Subp))
7386 or else Is_Abstract_Subprogram (Alias (Subp))
7387 or else Is_TSS (Subp, TSS_Stream_Input)
7391 elsif Is_Abstract_Subprogram (Subp)
7392 or else Requires_Overriding (Subp)
7394 (Is_Null_Extension (Etype (Subp))
7395 and then Etype (Alias (Subp)) /= Etype (Subp))
7397 Formal_List := No_List;
7398 Formal := First_Formal (Subp);
7400 if Present (Formal) then
7401 Formal_List := New_List;
7403 while Present (Formal) loop
7405 (Make_Parameter_Specification
7407 Defining_Identifier =>
7408 Make_Defining_Identifier (Sloc (Formal),
7409 Chars => Chars (Formal)),
7410 In_Present => In_Present (Parent (Formal)),
7411 Out_Present => Out_Present (Parent (Formal)),
7412 Null_Exclusion_Present =>
7413 Null_Exclusion_Present (Parent (Formal)),
7415 New_Reference_To (Etype (Formal), Loc),
7417 New_Copy_Tree (Expression (Parent (Formal)))),
7420 Next_Formal (Formal);
7425 Make_Function_Specification (Loc,
7426 Defining_Unit_Name =>
7427 Make_Defining_Identifier (Loc,
7428 Chars => Chars (Subp)),
7429 Parameter_Specifications => Formal_List,
7430 Result_Definition =>
7431 New_Reference_To (Etype (Subp), Loc));
7433 Func_Decl := Make_Subprogram_Declaration (Loc, Func_Spec);
7434 Append_To (Decl_List, Func_Decl);
7436 -- Build a wrapper body that calls the parent function. The body
7437 -- contains a single return statement that returns an extension
7438 -- aggregate whose ancestor part is a call to the parent function,
7439 -- passing the formals as actuals (with any controlling arguments
7440 -- converted to the types of the corresponding formals of the
7441 -- parent function, which might be anonymous access types), and
7442 -- having a null extension.
7444 Formal := First_Formal (Subp);
7445 Par_Formal := First_Formal (Alias (Subp));
7446 Formal_Node := First (Formal_List);
7448 if Present (Formal) then
7449 Actual_List := New_List;
7451 Actual_List := No_List;
7454 while Present (Formal) loop
7455 if Is_Controlling_Formal (Formal) then
7456 Append_To (Actual_List,
7457 Make_Type_Conversion (Loc,
7459 New_Occurrence_Of (Etype (Par_Formal), Loc),
7462 (Defining_Identifier (Formal_Node), Loc)));
7467 (Defining_Identifier (Formal_Node), Loc));
7470 Next_Formal (Formal);
7471 Next_Formal (Par_Formal);
7476 Make_Simple_Return_Statement (Loc,
7478 Make_Extension_Aggregate (Loc,
7480 Make_Function_Call (Loc,
7481 Name => New_Reference_To (Alias (Subp), Loc),
7482 Parameter_Associations => Actual_List),
7483 Null_Record_Present => True));
7486 Make_Subprogram_Body (Loc,
7487 Specification => New_Copy_Tree (Func_Spec),
7488 Declarations => Empty_List,
7489 Handled_Statement_Sequence =>
7490 Make_Handled_Sequence_Of_Statements (Loc,
7491 Statements => New_List (Return_Stmt)));
7493 Set_Defining_Unit_Name
7494 (Specification (Func_Body),
7495 Make_Defining_Identifier (Loc, Chars (Subp)));
7497 Append_To (Body_List, Func_Body);
7499 -- Replace the inherited function with the wrapper function
7500 -- in the primitive operations list.
7502 Override_Dispatching_Operation
7503 (Tag_Typ, Subp, New_Op => Defining_Unit_Name (Func_Spec));
7507 Next_Elmt (Prim_Elmt);
7509 end Make_Controlling_Function_Wrappers;
7515 -- <Make_Eq_If shared components>
7517 -- when V1 => <Make_Eq_Case> on subcomponents
7519 -- when Vn => <Make_Eq_Case> on subcomponents
7522 function Make_Eq_Case
7525 Discr : Entity_Id := Empty) return List_Id
7527 Loc : constant Source_Ptr := Sloc (E);
7528 Result : constant List_Id := New_List;
7533 Append_To (Result, Make_Eq_If (E, Component_Items (CL)));
7535 if No (Variant_Part (CL)) then
7539 Variant := First_Non_Pragma (Variants (Variant_Part (CL)));
7541 if No (Variant) then
7545 Alt_List := New_List;
7547 while Present (Variant) loop
7548 Append_To (Alt_List,
7549 Make_Case_Statement_Alternative (Loc,
7550 Discrete_Choices => New_Copy_List (Discrete_Choices (Variant)),
7551 Statements => Make_Eq_Case (E, Component_List (Variant))));
7553 Next_Non_Pragma (Variant);
7556 -- If we have an Unchecked_Union, use one of the parameters that
7557 -- captures the discriminants.
7559 if Is_Unchecked_Union (E) then
7561 Make_Case_Statement (Loc,
7562 Expression => New_Reference_To (Discr, Loc),
7563 Alternatives => Alt_List));
7567 Make_Case_Statement (Loc,
7569 Make_Selected_Component (Loc,
7570 Prefix => Make_Identifier (Loc, Name_X),
7571 Selector_Name => New_Copy (Name (Variant_Part (CL)))),
7572 Alternatives => Alt_List));
7593 -- or a null statement if the list L is empty
7597 L : List_Id) return Node_Id
7599 Loc : constant Source_Ptr := Sloc (E);
7601 Field_Name : Name_Id;
7606 return Make_Null_Statement (Loc);
7611 C := First_Non_Pragma (L);
7612 while Present (C) loop
7613 Field_Name := Chars (Defining_Identifier (C));
7615 -- The tags must not be compared: they are not part of the value.
7616 -- Ditto for the controller component, if present.
7618 -- Note also that in the following, we use Make_Identifier for
7619 -- the component names. Use of New_Reference_To to identify the
7620 -- components would be incorrect because the wrong entities for
7621 -- discriminants could be picked up in the private type case.
7623 if Field_Name /= Name_uTag
7625 Field_Name /= Name_uController
7627 Evolve_Or_Else (Cond,
7630 Make_Selected_Component (Loc,
7631 Prefix => Make_Identifier (Loc, Name_X),
7633 Make_Identifier (Loc, Field_Name)),
7636 Make_Selected_Component (Loc,
7637 Prefix => Make_Identifier (Loc, Name_Y),
7639 Make_Identifier (Loc, Field_Name))));
7642 Next_Non_Pragma (C);
7646 return Make_Null_Statement (Loc);
7650 Make_Implicit_If_Statement (E,
7652 Then_Statements => New_List (
7653 Make_Simple_Return_Statement (Loc,
7654 Expression => New_Occurrence_Of (Standard_False, Loc))));
7659 -------------------------------
7660 -- Make_Null_Procedure_Specs --
7661 -------------------------------
7663 procedure Make_Null_Procedure_Specs
7664 (Tag_Typ : Entity_Id;
7665 Decl_List : out List_Id)
7667 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7670 Formal_List : List_Id;
7671 New_Param_Spec : Node_Id;
7672 Parent_Subp : Entity_Id;
7673 Prim_Elmt : Elmt_Id;
7674 Proc_Decl : Node_Id;
7677 function Is_Null_Interface_Primitive (E : Entity_Id) return Boolean;
7678 -- Returns True if E is a null procedure that is an interface primitive
7680 ---------------------------------
7681 -- Is_Null_Interface_Primitive --
7682 ---------------------------------
7684 function Is_Null_Interface_Primitive (E : Entity_Id) return Boolean is
7686 return Comes_From_Source (E)
7687 and then Is_Dispatching_Operation (E)
7688 and then Ekind (E) = E_Procedure
7689 and then Null_Present (Parent (E))
7690 and then Is_Interface (Find_Dispatching_Type (E));
7691 end Is_Null_Interface_Primitive;
7693 -- Start of processing for Make_Null_Procedure_Specs
7696 Decl_List := New_List;
7697 Prim_Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
7698 while Present (Prim_Elmt) loop
7699 Subp := Node (Prim_Elmt);
7701 -- If a null procedure inherited from an interface has not been
7702 -- overridden, then we build a null procedure declaration to
7703 -- override the inherited procedure.
7705 Parent_Subp := Alias (Subp);
7707 if Present (Parent_Subp)
7708 and then Is_Null_Interface_Primitive (Parent_Subp)
7710 Formal_List := No_List;
7711 Formal := First_Formal (Subp);
7713 if Present (Formal) then
7714 Formal_List := New_List;
7716 while Present (Formal) loop
7718 -- Copy the parameter spec including default expressions
7721 New_Copy_Tree (Parent (Formal), New_Sloc => Loc);
7723 -- Generate a new defining identifier for the new formal.
7724 -- required because New_Copy_Tree does not duplicate
7725 -- semantic fields (except itypes).
7727 Set_Defining_Identifier (New_Param_Spec,
7728 Make_Defining_Identifier (Sloc (Formal),
7729 Chars => Chars (Formal)));
7731 -- For controlling arguments we must change their
7732 -- parameter type to reference the tagged type (instead
7733 -- of the interface type)
7735 if Is_Controlling_Formal (Formal) then
7736 if Nkind (Parameter_Type (Parent (Formal)))
7739 Set_Parameter_Type (New_Param_Spec,
7740 New_Occurrence_Of (Tag_Typ, Loc));
7743 (Nkind (Parameter_Type (Parent (Formal)))
7744 = N_Access_Definition);
7745 Set_Subtype_Mark (Parameter_Type (New_Param_Spec),
7746 New_Occurrence_Of (Tag_Typ, Loc));
7750 Append (New_Param_Spec, Formal_List);
7752 Next_Formal (Formal);
7757 Make_Subprogram_Declaration (Loc,
7758 Make_Procedure_Specification (Loc,
7759 Defining_Unit_Name =>
7760 Make_Defining_Identifier (Loc, Chars (Subp)),
7761 Parameter_Specifications => Formal_List,
7762 Null_Present => True));
7763 Append_To (Decl_List, Proc_Decl);
7764 Analyze (Proc_Decl);
7767 Next_Elmt (Prim_Elmt);
7769 end Make_Null_Procedure_Specs;
7771 -------------------------------------
7772 -- Make_Predefined_Primitive_Specs --
7773 -------------------------------------
7775 procedure Make_Predefined_Primitive_Specs
7776 (Tag_Typ : Entity_Id;
7777 Predef_List : out List_Id;
7778 Renamed_Eq : out Entity_Id)
7780 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7781 Res : constant List_Id := New_List;
7783 Eq_Needed : Boolean;
7785 Eq_Name : Name_Id := Name_Op_Eq;
7787 function Is_Predefined_Eq_Renaming (Prim : Node_Id) return Boolean;
7788 -- Returns true if Prim is a renaming of an unresolved predefined
7789 -- equality operation.
7791 -------------------------------
7792 -- Is_Predefined_Eq_Renaming --
7793 -------------------------------
7795 function Is_Predefined_Eq_Renaming (Prim : Node_Id) return Boolean is
7797 return Chars (Prim) /= Name_Op_Eq
7798 and then Present (Alias (Prim))
7799 and then Comes_From_Source (Prim)
7800 and then Is_Intrinsic_Subprogram (Alias (Prim))
7801 and then Chars (Alias (Prim)) = Name_Op_Eq;
7802 end Is_Predefined_Eq_Renaming;
7804 -- Start of processing for Make_Predefined_Primitive_Specs
7807 Renamed_Eq := Empty;
7811 Append_To (Res, Predef_Spec_Or_Body (Loc,
7814 Profile => New_List (
7815 Make_Parameter_Specification (Loc,
7816 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7817 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7819 Ret_Type => Standard_Long_Long_Integer));
7821 -- Spec of _Alignment
7823 Append_To (Res, Predef_Spec_Or_Body (Loc,
7825 Name => Name_uAlignment,
7826 Profile => New_List (
7827 Make_Parameter_Specification (Loc,
7828 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7829 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7831 Ret_Type => Standard_Integer));
7833 -- Specs for dispatching stream attributes
7836 Stream_Op_TSS_Names :
7837 constant array (Integer range <>) of TSS_Name_Type :=
7844 for Op in Stream_Op_TSS_Names'Range loop
7845 if Stream_Operation_OK (Tag_Typ, Stream_Op_TSS_Names (Op)) then
7847 Predef_Stream_Attr_Spec (Loc, Tag_Typ,
7848 Stream_Op_TSS_Names (Op)));
7853 -- Spec of "=" is expanded if the type is not limited and if a
7854 -- user defined "=" was not already declared for the non-full
7855 -- view of a private extension
7857 if not Is_Limited_Type (Tag_Typ) then
7859 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
7860 while Present (Prim) loop
7862 -- If a primitive is encountered that renames the predefined
7863 -- equality operator before reaching any explicit equality
7864 -- primitive, then we still need to create a predefined
7865 -- equality function, because calls to it can occur via
7866 -- the renaming. A new name is created for the equality
7867 -- to avoid conflicting with any user-defined equality.
7868 -- (Note that this doesn't account for renamings of
7869 -- equality nested within subpackages???)
7871 if Is_Predefined_Eq_Renaming (Node (Prim)) then
7872 Eq_Name := New_External_Name (Chars (Node (Prim)), 'E');
7874 -- User-defined equality
7876 elsif Chars (Node (Prim)) = Name_Op_Eq
7877 and then Etype (First_Formal (Node (Prim))) =
7878 Etype (Next_Formal (First_Formal (Node (Prim))))
7879 and then Base_Type (Etype (Node (Prim))) = Standard_Boolean
7881 if No (Alias (Node (Prim)))
7882 or else Nkind (Unit_Declaration_Node (Node (Prim))) =
7883 N_Subprogram_Renaming_Declaration
7888 -- If the parent is not an interface type and has an abstract
7889 -- equality function, the inherited equality is abstract as
7890 -- well, and no body can be created for it.
7892 elsif not Is_Interface (Etype (Tag_Typ))
7893 and then Present (Alias (Node (Prim)))
7894 and then Is_Abstract_Subprogram (Alias (Node (Prim)))
7899 -- If the type has an equality function corresponding with
7900 -- a primitive defined in an interface type, the inherited
7901 -- equality is abstract as well, and no body can be created
7904 elsif Present (Alias (Node (Prim)))
7905 and then Comes_From_Source (Ultimate_Alias (Node (Prim)))
7908 (Find_Dispatching_Type (Ultimate_Alias (Node (Prim))))
7918 -- If a renaming of predefined equality was found but there was no
7919 -- user-defined equality (so Eq_Needed is still true), then set the
7920 -- name back to Name_Op_Eq. But in the case where a user-defined
7921 -- equality was located after such a renaming, then the predefined
7922 -- equality function is still needed, so Eq_Needed must be set back
7925 if Eq_Name /= Name_Op_Eq then
7927 Eq_Name := Name_Op_Eq;
7934 Eq_Spec := Predef_Spec_Or_Body (Loc,
7937 Profile => New_List (
7938 Make_Parameter_Specification (Loc,
7939 Defining_Identifier =>
7940 Make_Defining_Identifier (Loc, Name_X),
7941 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
7942 Make_Parameter_Specification (Loc,
7943 Defining_Identifier =>
7944 Make_Defining_Identifier (Loc, Name_Y),
7945 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7946 Ret_Type => Standard_Boolean);
7947 Append_To (Res, Eq_Spec);
7949 if Eq_Name /= Name_Op_Eq then
7950 Renamed_Eq := Defining_Unit_Name (Specification (Eq_Spec));
7952 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
7953 while Present (Prim) loop
7955 -- Any renamings of equality that appeared before an
7956 -- overriding equality must be updated to refer to the
7957 -- entity for the predefined equality, otherwise calls via
7958 -- the renaming would get incorrectly resolved to call the
7959 -- user-defined equality function.
7961 if Is_Predefined_Eq_Renaming (Node (Prim)) then
7962 Set_Alias (Node (Prim), Renamed_Eq);
7964 -- Exit upon encountering a user-defined equality
7966 elsif Chars (Node (Prim)) = Name_Op_Eq
7967 and then No (Alias (Node (Prim)))
7977 -- Spec for dispatching assignment
7979 Append_To (Res, Predef_Spec_Or_Body (Loc,
7981 Name => Name_uAssign,
7982 Profile => New_List (
7983 Make_Parameter_Specification (Loc,
7984 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7985 Out_Present => True,
7986 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
7988 Make_Parameter_Specification (Loc,
7989 Defining_Identifier => Make_Defining_Identifier (Loc, Name_Y),
7990 Parameter_Type => New_Reference_To (Tag_Typ, Loc)))));
7993 -- Ada 2005: Generate declarations for the following primitive
7994 -- operations for limited interfaces and synchronized types that
7995 -- implement a limited interface.
7997 -- Disp_Asynchronous_Select
7998 -- Disp_Conditional_Select
7999 -- Disp_Get_Prim_Op_Kind
8002 -- Disp_Timed_Select
8004 -- These operations cannot be implemented on VM targets, so we simply
8005 -- disable their generation in this case. Disable the generation of
8006 -- these bodies if No_Dispatching_Calls, Ravenscar or ZFP is active.
8008 if Ada_Version >= Ada_05
8009 and then Tagged_Type_Expansion
8010 and then not Restriction_Active (No_Dispatching_Calls)
8011 and then not Restriction_Active (No_Select_Statements)
8012 and then RTE_Available (RE_Select_Specific_Data)
8014 -- These primitives are defined abstract in interface types
8016 if Is_Interface (Tag_Typ)
8017 and then Is_Limited_Record (Tag_Typ)
8020 Make_Abstract_Subprogram_Declaration (Loc,
8022 Make_Disp_Asynchronous_Select_Spec (Tag_Typ)));
8025 Make_Abstract_Subprogram_Declaration (Loc,
8027 Make_Disp_Conditional_Select_Spec (Tag_Typ)));
8030 Make_Abstract_Subprogram_Declaration (Loc,
8032 Make_Disp_Get_Prim_Op_Kind_Spec (Tag_Typ)));
8035 Make_Abstract_Subprogram_Declaration (Loc,
8037 Make_Disp_Get_Task_Id_Spec (Tag_Typ)));
8040 Make_Abstract_Subprogram_Declaration (Loc,
8042 Make_Disp_Requeue_Spec (Tag_Typ)));
8045 Make_Abstract_Subprogram_Declaration (Loc,
8047 Make_Disp_Timed_Select_Spec (Tag_Typ)));
8049 -- If the ancestor is an interface type we declare non-abstract
8050 -- primitives to override the abstract primitives of the interface
8053 elsif (not Is_Interface (Tag_Typ)
8054 and then Is_Interface (Etype (Tag_Typ))
8055 and then Is_Limited_Record (Etype (Tag_Typ)))
8057 (Is_Concurrent_Record_Type (Tag_Typ)
8058 and then Has_Interfaces (Tag_Typ))
8061 Make_Subprogram_Declaration (Loc,
8063 Make_Disp_Asynchronous_Select_Spec (Tag_Typ)));
8066 Make_Subprogram_Declaration (Loc,
8068 Make_Disp_Conditional_Select_Spec (Tag_Typ)));
8071 Make_Subprogram_Declaration (Loc,
8073 Make_Disp_Get_Prim_Op_Kind_Spec (Tag_Typ)));
8076 Make_Subprogram_Declaration (Loc,
8078 Make_Disp_Get_Task_Id_Spec (Tag_Typ)));
8081 Make_Subprogram_Declaration (Loc,
8083 Make_Disp_Requeue_Spec (Tag_Typ)));
8086 Make_Subprogram_Declaration (Loc,
8088 Make_Disp_Timed_Select_Spec (Tag_Typ)));
8092 -- Specs for finalization actions that may be required in case a future
8093 -- extension contain a controlled element. We generate those only for
8094 -- root tagged types where they will get dummy bodies or when the type
8095 -- has controlled components and their body must be generated. It is
8096 -- also impossible to provide those for tagged types defined within
8097 -- s-finimp since it would involve circularity problems
8099 if In_Finalization_Root (Tag_Typ) then
8102 -- We also skip these if finalization is not available
8104 elsif Restriction_Active (No_Finalization) then
8107 -- We skip these for CIL Value types, where finalization is not
8110 elsif Is_Value_Type (Tag_Typ) then
8113 elsif Etype (Tag_Typ) = Tag_Typ
8114 or else Needs_Finalization (Tag_Typ)
8116 -- Ada 2005 (AI-251): We must also generate these subprograms if
8117 -- the immediate ancestor is an interface to ensure the correct
8118 -- initialization of its dispatch table.
8120 or else (not Is_Interface (Tag_Typ)
8121 and then Is_Interface (Etype (Tag_Typ)))
8123 -- Ada 205 (AI-251): We must also generate these subprograms if
8124 -- the parent of an nonlimited interface is a limited interface
8126 or else (Is_Interface (Tag_Typ)
8127 and then not Is_Limited_Interface (Tag_Typ)
8128 and then Is_Limited_Interface (Etype (Tag_Typ)))
8130 if not Is_Limited_Type (Tag_Typ) then
8132 Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Adjust));
8135 Append_To (Res, Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Finalize));
8139 end Make_Predefined_Primitive_Specs;
8141 ---------------------------------
8142 -- Needs_Simple_Initialization --
8143 ---------------------------------
8145 function Needs_Simple_Initialization (T : Entity_Id) return Boolean is
8147 -- Check for private type, in which case test applies to the underlying
8148 -- type of the private type.
8150 if Is_Private_Type (T) then
8152 RT : constant Entity_Id := Underlying_Type (T);
8155 if Present (RT) then
8156 return Needs_Simple_Initialization (RT);
8162 -- Cases needing simple initialization are access types, and, if pragma
8163 -- Normalize_Scalars or Initialize_Scalars is in effect, then all scalar
8166 elsif Is_Access_Type (T)
8167 or else (Init_Or_Norm_Scalars and then (Is_Scalar_Type (T)))
8171 -- If Initialize/Normalize_Scalars is in effect, string objects also
8172 -- need initialization, unless they are created in the course of
8173 -- expanding an aggregate (since in the latter case they will be
8174 -- filled with appropriate initializing values before they are used).
8176 elsif Init_Or_Norm_Scalars
8178 (Root_Type (T) = Standard_String
8179 or else Root_Type (T) = Standard_Wide_String
8180 or else Root_Type (T) = Standard_Wide_Wide_String)
8183 or else Nkind (Associated_Node_For_Itype (T)) /= N_Aggregate)
8190 end Needs_Simple_Initialization;
8192 ----------------------
8193 -- Predef_Deep_Spec --
8194 ----------------------
8196 function Predef_Deep_Spec
8198 Tag_Typ : Entity_Id;
8199 Name : TSS_Name_Type;
8200 For_Body : Boolean := False) return Node_Id
8206 if Name = TSS_Deep_Finalize then
8208 Type_B := Standard_Boolean;
8212 Make_Parameter_Specification (Loc,
8213 Defining_Identifier => Make_Defining_Identifier (Loc, Name_L),
8215 Out_Present => True,
8217 New_Reference_To (RTE (RE_Finalizable_Ptr), Loc)));
8218 Type_B := Standard_Short_Short_Integer;
8222 Make_Parameter_Specification (Loc,
8223 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
8225 Out_Present => True,
8226 Parameter_Type => New_Reference_To (Tag_Typ, Loc)));
8229 Make_Parameter_Specification (Loc,
8230 Defining_Identifier => Make_Defining_Identifier (Loc, Name_B),
8231 Parameter_Type => New_Reference_To (Type_B, Loc)));
8233 return Predef_Spec_Or_Body (Loc,
8234 Name => Make_TSS_Name (Tag_Typ, Name),
8237 For_Body => For_Body);
8240 when RE_Not_Available =>
8242 end Predef_Deep_Spec;
8244 -------------------------
8245 -- Predef_Spec_Or_Body --
8246 -------------------------
8248 function Predef_Spec_Or_Body
8250 Tag_Typ : Entity_Id;
8253 Ret_Type : Entity_Id := Empty;
8254 For_Body : Boolean := False) return Node_Id
8256 Id : constant Entity_Id := Make_Defining_Identifier (Loc, Name);
8260 Set_Is_Public (Id, Is_Public (Tag_Typ));
8262 -- The internal flag is set to mark these declarations because they have
8263 -- specific properties. First, they are primitives even if they are not
8264 -- defined in the type scope (the freezing point is not necessarily in
8265 -- the same scope). Second, the predefined equality can be overridden by
8266 -- a user-defined equality, no body will be generated in this case.
8268 Set_Is_Internal (Id);
8270 if not Debug_Generated_Code then
8271 Set_Debug_Info_Off (Id);
8274 if No (Ret_Type) then
8276 Make_Procedure_Specification (Loc,
8277 Defining_Unit_Name => Id,
8278 Parameter_Specifications => Profile);
8281 Make_Function_Specification (Loc,
8282 Defining_Unit_Name => Id,
8283 Parameter_Specifications => Profile,
8284 Result_Definition =>
8285 New_Reference_To (Ret_Type, Loc));
8288 if Is_Interface (Tag_Typ) then
8289 return Make_Abstract_Subprogram_Declaration (Loc, Spec);
8291 -- If body case, return empty subprogram body. Note that this is ill-
8292 -- formed, because there is not even a null statement, and certainly not
8293 -- a return in the function case. The caller is expected to do surgery
8294 -- on the body to add the appropriate stuff.
8297 return Make_Subprogram_Body (Loc, Spec, Empty_List, Empty);
8299 -- For the case of an Input attribute predefined for an abstract type,
8300 -- generate an abstract specification. This will never be called, but we
8301 -- need the slot allocated in the dispatching table so that attributes
8302 -- typ'Class'Input and typ'Class'Output will work properly.
8304 elsif Is_TSS (Name, TSS_Stream_Input)
8305 and then Is_Abstract_Type (Tag_Typ)
8307 return Make_Abstract_Subprogram_Declaration (Loc, Spec);
8309 -- Normal spec case, where we return a subprogram declaration
8312 return Make_Subprogram_Declaration (Loc, Spec);
8314 end Predef_Spec_Or_Body;
8316 -----------------------------
8317 -- Predef_Stream_Attr_Spec --
8318 -----------------------------
8320 function Predef_Stream_Attr_Spec
8322 Tag_Typ : Entity_Id;
8323 Name : TSS_Name_Type;
8324 For_Body : Boolean := False) return Node_Id
8326 Ret_Type : Entity_Id;
8329 if Name = TSS_Stream_Input then
8330 Ret_Type := Tag_Typ;
8335 return Predef_Spec_Or_Body (Loc,
8336 Name => Make_TSS_Name (Tag_Typ, Name),
8338 Profile => Build_Stream_Attr_Profile (Loc, Tag_Typ, Name),
8339 Ret_Type => Ret_Type,
8340 For_Body => For_Body);
8341 end Predef_Stream_Attr_Spec;
8343 ---------------------------------
8344 -- Predefined_Primitive_Bodies --
8345 ---------------------------------
8347 function Predefined_Primitive_Bodies
8348 (Tag_Typ : Entity_Id;
8349 Renamed_Eq : Entity_Id) return List_Id
8351 Loc : constant Source_Ptr := Sloc (Tag_Typ);
8352 Res : constant List_Id := New_List;
8355 Eq_Needed : Boolean;
8359 pragma Warnings (Off, Ent);
8362 pragma Assert (not Is_Interface (Tag_Typ));
8364 -- See if we have a predefined "=" operator
8366 if Present (Renamed_Eq) then
8368 Eq_Name := Chars (Renamed_Eq);
8370 -- If the parent is an interface type then it has defined all the
8371 -- predefined primitives abstract and we need to check if the type
8372 -- has some user defined "=" function to avoid generating it.
8374 elsif Is_Interface (Etype (Tag_Typ)) then
8376 Eq_Name := Name_Op_Eq;
8378 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8379 while Present (Prim) loop
8380 if Chars (Node (Prim)) = Name_Op_Eq
8381 and then not Is_Internal (Node (Prim))
8395 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8396 while Present (Prim) loop
8397 if Chars (Node (Prim)) = Name_Op_Eq
8398 and then Is_Internal (Node (Prim))
8401 Eq_Name := Name_Op_Eq;
8409 -- Body of _Alignment
8411 Decl := Predef_Spec_Or_Body (Loc,
8413 Name => Name_uAlignment,
8414 Profile => New_List (
8415 Make_Parameter_Specification (Loc,
8416 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8417 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8419 Ret_Type => Standard_Integer,
8422 Set_Handled_Statement_Sequence (Decl,
8423 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8424 Make_Simple_Return_Statement (Loc,
8426 Make_Attribute_Reference (Loc,
8427 Prefix => Make_Identifier (Loc, Name_X),
8428 Attribute_Name => Name_Alignment)))));
8430 Append_To (Res, Decl);
8434 Decl := Predef_Spec_Or_Body (Loc,
8437 Profile => New_List (
8438 Make_Parameter_Specification (Loc,
8439 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8440 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8442 Ret_Type => Standard_Long_Long_Integer,
8445 Set_Handled_Statement_Sequence (Decl,
8446 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8447 Make_Simple_Return_Statement (Loc,
8449 Make_Attribute_Reference (Loc,
8450 Prefix => Make_Identifier (Loc, Name_X),
8451 Attribute_Name => Name_Size)))));
8453 Append_To (Res, Decl);
8455 -- Bodies for Dispatching stream IO routines. We need these only for
8456 -- non-limited types (in the limited case there is no dispatching).
8457 -- We also skip them if dispatching or finalization are not available.
8459 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Read)
8460 and then No (TSS (Tag_Typ, TSS_Stream_Read))
8462 Build_Record_Read_Procedure (Loc, Tag_Typ, Decl, Ent);
8463 Append_To (Res, Decl);
8466 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Write)
8467 and then No (TSS (Tag_Typ, TSS_Stream_Write))
8469 Build_Record_Write_Procedure (Loc, Tag_Typ, Decl, Ent);
8470 Append_To (Res, Decl);
8473 -- Skip body of _Input for the abstract case, since the corresponding
8474 -- spec is abstract (see Predef_Spec_Or_Body).
8476 if not Is_Abstract_Type (Tag_Typ)
8477 and then Stream_Operation_OK (Tag_Typ, TSS_Stream_Input)
8478 and then No (TSS (Tag_Typ, TSS_Stream_Input))
8480 Build_Record_Or_Elementary_Input_Function
8481 (Loc, Tag_Typ, Decl, Ent);
8482 Append_To (Res, Decl);
8485 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Output)
8486 and then No (TSS (Tag_Typ, TSS_Stream_Output))
8488 Build_Record_Or_Elementary_Output_Procedure
8489 (Loc, Tag_Typ, Decl, Ent);
8490 Append_To (Res, Decl);
8493 -- Ada 2005: Generate bodies for the following primitive operations for
8494 -- limited interfaces and synchronized types that implement a limited
8497 -- disp_asynchronous_select
8498 -- disp_conditional_select
8499 -- disp_get_prim_op_kind
8501 -- disp_timed_select
8503 -- The interface versions will have null bodies
8505 -- These operations cannot be implemented on VM targets, so we simply
8506 -- disable their generation in this case. Disable the generation of
8507 -- these bodies if No_Dispatching_Calls, Ravenscar or ZFP is active.
8509 if Ada_Version >= Ada_05
8510 and then Tagged_Type_Expansion
8511 and then not Is_Interface (Tag_Typ)
8513 ((Is_Interface (Etype (Tag_Typ))
8514 and then Is_Limited_Record (Etype (Tag_Typ)))
8515 or else (Is_Concurrent_Record_Type (Tag_Typ)
8516 and then Has_Interfaces (Tag_Typ)))
8517 and then not Restriction_Active (No_Dispatching_Calls)
8518 and then not Restriction_Active (No_Select_Statements)
8519 and then RTE_Available (RE_Select_Specific_Data)
8521 Append_To (Res, Make_Disp_Asynchronous_Select_Body (Tag_Typ));
8522 Append_To (Res, Make_Disp_Conditional_Select_Body (Tag_Typ));
8523 Append_To (Res, Make_Disp_Get_Prim_Op_Kind_Body (Tag_Typ));
8524 Append_To (Res, Make_Disp_Get_Task_Id_Body (Tag_Typ));
8525 Append_To (Res, Make_Disp_Requeue_Body (Tag_Typ));
8526 Append_To (Res, Make_Disp_Timed_Select_Body (Tag_Typ));
8529 if not Is_Limited_Type (Tag_Typ)
8530 and then not Is_Interface (Tag_Typ)
8532 -- Body for equality
8536 Predef_Spec_Or_Body (Loc,
8539 Profile => New_List (
8540 Make_Parameter_Specification (Loc,
8541 Defining_Identifier =>
8542 Make_Defining_Identifier (Loc, Name_X),
8543 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
8545 Make_Parameter_Specification (Loc,
8546 Defining_Identifier =>
8547 Make_Defining_Identifier (Loc, Name_Y),
8548 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8550 Ret_Type => Standard_Boolean,
8554 Def : constant Node_Id := Parent (Tag_Typ);
8555 Stmts : constant List_Id := New_List;
8556 Variant_Case : Boolean := Has_Discriminants (Tag_Typ);
8557 Comps : Node_Id := Empty;
8558 Typ_Def : Node_Id := Type_Definition (Def);
8561 if Variant_Case then
8562 if Nkind (Typ_Def) = N_Derived_Type_Definition then
8563 Typ_Def := Record_Extension_Part (Typ_Def);
8566 if Present (Typ_Def) then
8567 Comps := Component_List (Typ_Def);
8570 Variant_Case := Present (Comps)
8571 and then Present (Variant_Part (Comps));
8574 if Variant_Case then
8576 Make_Eq_If (Tag_Typ, Discriminant_Specifications (Def)));
8577 Append_List_To (Stmts, Make_Eq_Case (Tag_Typ, Comps));
8579 Make_Simple_Return_Statement (Loc,
8580 Expression => New_Reference_To (Standard_True, Loc)));
8584 Make_Simple_Return_Statement (Loc,
8586 Expand_Record_Equality (Tag_Typ,
8588 Lhs => Make_Identifier (Loc, Name_X),
8589 Rhs => Make_Identifier (Loc, Name_Y),
8590 Bodies => Declarations (Decl))));
8593 Set_Handled_Statement_Sequence (Decl,
8594 Make_Handled_Sequence_Of_Statements (Loc, Stmts));
8596 Append_To (Res, Decl);
8599 -- Body for dispatching assignment
8602 Predef_Spec_Or_Body (Loc,
8604 Name => Name_uAssign,
8605 Profile => New_List (
8606 Make_Parameter_Specification (Loc,
8607 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8608 Out_Present => True,
8609 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
8611 Make_Parameter_Specification (Loc,
8612 Defining_Identifier => Make_Defining_Identifier (Loc, Name_Y),
8613 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8616 Set_Handled_Statement_Sequence (Decl,
8617 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8618 Make_Assignment_Statement (Loc,
8619 Name => Make_Identifier (Loc, Name_X),
8620 Expression => Make_Identifier (Loc, Name_Y)))));
8622 Append_To (Res, Decl);
8625 -- Generate dummy bodies for finalization actions of types that have
8626 -- no controlled components.
8628 -- Skip this processing if we are in the finalization routine in the
8629 -- runtime itself, otherwise we get hopelessly circularly confused!
8631 if In_Finalization_Root (Tag_Typ) then
8634 -- Skip this if finalization is not available
8636 elsif Restriction_Active (No_Finalization) then
8639 elsif (Etype (Tag_Typ) = Tag_Typ
8640 or else Is_Controlled (Tag_Typ)
8642 -- Ada 2005 (AI-251): We must also generate these subprograms
8643 -- if the immediate ancestor of Tag_Typ is an interface to
8644 -- ensure the correct initialization of its dispatch table.
8646 or else (not Is_Interface (Tag_Typ)
8648 Is_Interface (Etype (Tag_Typ))))
8649 and then not Has_Controlled_Component (Tag_Typ)
8651 if not Is_Limited_Type (Tag_Typ) then
8652 Decl := Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Adjust, True);
8654 if Is_Controlled (Tag_Typ) then
8655 Set_Handled_Statement_Sequence (Decl,
8656 Make_Handled_Sequence_Of_Statements (Loc,
8658 Ref => Make_Identifier (Loc, Name_V),
8660 Flist_Ref => Make_Identifier (Loc, Name_L),
8661 With_Attach => Make_Identifier (Loc, Name_B))));
8664 Set_Handled_Statement_Sequence (Decl,
8665 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8666 Make_Null_Statement (Loc))));
8669 Append_To (Res, Decl);
8672 Decl := Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Finalize, True);
8674 if Is_Controlled (Tag_Typ) then
8675 Set_Handled_Statement_Sequence (Decl,
8676 Make_Handled_Sequence_Of_Statements (Loc,
8678 Ref => Make_Identifier (Loc, Name_V),
8680 With_Detach => Make_Identifier (Loc, Name_B))));
8683 Set_Handled_Statement_Sequence (Decl,
8684 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8685 Make_Null_Statement (Loc))));
8688 Append_To (Res, Decl);
8692 end Predefined_Primitive_Bodies;
8694 ---------------------------------
8695 -- Predefined_Primitive_Freeze --
8696 ---------------------------------
8698 function Predefined_Primitive_Freeze
8699 (Tag_Typ : Entity_Id) return List_Id
8701 Loc : constant Source_Ptr := Sloc (Tag_Typ);
8702 Res : constant List_Id := New_List;
8707 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8708 while Present (Prim) loop
8709 if Is_Predefined_Dispatching_Operation (Node (Prim)) then
8710 Frnodes := Freeze_Entity (Node (Prim), Loc);
8712 if Present (Frnodes) then
8713 Append_List_To (Res, Frnodes);
8721 end Predefined_Primitive_Freeze;
8723 -------------------------
8724 -- Stream_Operation_OK --
8725 -------------------------
8727 function Stream_Operation_OK
8729 Operation : TSS_Name_Type) return Boolean
8731 Has_Predefined_Or_Specified_Stream_Attribute : Boolean := False;
8734 -- Special case of a limited type extension: a default implementation
8735 -- of the stream attributes Read or Write exists if that attribute
8736 -- has been specified or is available for an ancestor type; a default
8737 -- implementation of the attribute Output (resp. Input) exists if the
8738 -- attribute has been specified or Write (resp. Read) is available for
8739 -- an ancestor type. The last condition only applies under Ada 2005.
8741 if Is_Limited_Type (Typ)
8742 and then Is_Tagged_Type (Typ)
8744 if Operation = TSS_Stream_Read then
8745 Has_Predefined_Or_Specified_Stream_Attribute :=
8746 Has_Specified_Stream_Read (Typ);
8748 elsif Operation = TSS_Stream_Write then
8749 Has_Predefined_Or_Specified_Stream_Attribute :=
8750 Has_Specified_Stream_Write (Typ);
8752 elsif Operation = TSS_Stream_Input then
8753 Has_Predefined_Or_Specified_Stream_Attribute :=
8754 Has_Specified_Stream_Input (Typ)
8756 (Ada_Version >= Ada_05
8757 and then Stream_Operation_OK (Typ, TSS_Stream_Read));
8759 elsif Operation = TSS_Stream_Output then
8760 Has_Predefined_Or_Specified_Stream_Attribute :=
8761 Has_Specified_Stream_Output (Typ)
8763 (Ada_Version >= Ada_05
8764 and then Stream_Operation_OK (Typ, TSS_Stream_Write));
8767 -- Case of inherited TSS_Stream_Read or TSS_Stream_Write
8769 if not Has_Predefined_Or_Specified_Stream_Attribute
8770 and then Is_Derived_Type (Typ)
8771 and then (Operation = TSS_Stream_Read
8772 or else Operation = TSS_Stream_Write)
8774 Has_Predefined_Or_Specified_Stream_Attribute :=
8776 (Find_Inherited_TSS (Base_Type (Etype (Typ)), Operation));
8780 -- If the type is not limited, or else is limited but the attribute is
8781 -- explicitly specified or is predefined for the type, then return True,
8782 -- unless other conditions prevail, such as restrictions prohibiting
8783 -- streams or dispatching operations. We also return True for limited
8784 -- interfaces, because they may be extended by nonlimited types and
8785 -- permit inheritance in this case (addresses cases where an abstract
8786 -- extension doesn't get 'Input declared, as per comments below, but
8787 -- 'Class'Input must still be allowed). Note that attempts to apply
8788 -- stream attributes to a limited interface or its class-wide type
8789 -- (or limited extensions thereof) will still get properly rejected
8790 -- by Check_Stream_Attribute.
8792 -- We exclude the Input operation from being a predefined subprogram in
8793 -- the case where the associated type is an abstract extension, because
8794 -- the attribute is not callable in that case, per 13.13.2(49/2). Also,
8795 -- we don't want an abstract version created because types derived from
8796 -- the abstract type may not even have Input available (for example if
8797 -- derived from a private view of the abstract type that doesn't have
8798 -- a visible Input), but a VM such as .NET or the Java VM can treat the
8799 -- operation as inherited anyway, and we don't want an abstract function
8800 -- to be (implicitly) inherited in that case because it can lead to a VM
8803 return (not Is_Limited_Type (Typ)
8804 or else Is_Interface (Typ)
8805 or else Has_Predefined_Or_Specified_Stream_Attribute)
8806 and then (Operation /= TSS_Stream_Input
8807 or else not Is_Abstract_Type (Typ)
8808 or else not Is_Derived_Type (Typ))
8809 and then not Has_Unknown_Discriminants (Typ)
8810 and then not (Is_Interface (Typ)
8811 and then (Is_Task_Interface (Typ)
8812 or else Is_Protected_Interface (Typ)
8813 or else Is_Synchronized_Interface (Typ)))
8814 and then not Restriction_Active (No_Streams)
8815 and then not Restriction_Active (No_Dispatch)
8816 and then not No_Run_Time_Mode
8817 and then RTE_Available (RE_Tag)
8818 and then RTE_Available (RE_Root_Stream_Type);
8819 end Stream_Operation_OK;