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_Ch8; use Sem_Ch8;
57 with Sem_Disp; use Sem_Disp;
58 with Sem_Eval; use Sem_Eval;
59 with Sem_Mech; use Sem_Mech;
60 with Sem_Res; use Sem_Res;
61 with Sem_Type; use Sem_Type;
62 with Sem_Util; use Sem_Util;
63 with Sinfo; use Sinfo;
64 with Stand; use Stand;
65 with Snames; use Snames;
66 with Targparm; use Targparm;
67 with Tbuild; use Tbuild;
68 with Ttypes; use Ttypes;
69 with Validsw; use Validsw;
71 package body Exp_Ch3 is
73 -----------------------
74 -- Local Subprograms --
75 -----------------------
77 function Add_Final_Chain (Def_Id : Entity_Id) return Entity_Id;
78 -- Add the declaration of a finalization list to the freeze actions for
79 -- Def_Id, and return its defining identifier.
81 procedure Adjust_Discriminants (Rtype : Entity_Id);
82 -- This is used when freezing a record type. It attempts to construct
83 -- more restrictive subtypes for discriminants so that the max size of
84 -- the record can be calculated more accurately. See the body of this
85 -- procedure for details.
87 procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id);
88 -- Build initialization procedure for given array type. Nod is a node
89 -- used for attachment of any actions required in its construction.
90 -- It also supplies the source location used for the procedure.
92 function Build_Discriminant_Formals
94 Use_Dl : Boolean) return List_Id;
95 -- This function uses the discriminants of a type to build a list of
96 -- formal parameters, used in the following function. If the flag Use_Dl
97 -- is set, the list is built using the already defined discriminals
98 -- of the type. Otherwise new identifiers are created, with the source
99 -- names of the discriminants.
101 function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id;
102 -- This function builds a static aggregate that can serve as the initial
103 -- value for an array type whose bounds are static, and whose component
104 -- type is a composite type that has a static equivalent aggregate.
105 -- The equivalent array aggregate is used both for object initialization
106 -- and for component initialization, when used in the following function.
108 function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id;
109 -- This function builds a static aggregate that can serve as the initial
110 -- value for a record type whose components are scalar and initialized
111 -- with compile-time values, or arrays with similar initialization or
112 -- defaults. When possible, initialization of an object of the type can
113 -- be achieved by using a copy of the aggregate as an initial value, thus
114 -- removing the implicit call that would otherwise constitute elaboration
117 function Build_Master_Renaming
119 T : Entity_Id) return Entity_Id;
120 -- If the designated type of an access type is a task type or contains
121 -- tasks, we make sure that a _Master variable is declared in the current
122 -- scope, and then declare a renaming for it:
124 -- atypeM : Master_Id renames _Master;
126 -- where atyp is the name of the access type. This declaration is used when
127 -- an allocator for the access type is expanded. The node is the full
128 -- declaration of the designated type that contains tasks. The renaming
129 -- declaration is inserted before N, and after the Master declaration.
131 procedure Build_Record_Init_Proc (N : Node_Id; Pe : Entity_Id);
132 -- Build record initialization procedure. N is the type declaration
133 -- node, and Pe is the corresponding entity for the record type.
135 procedure Build_Slice_Assignment (Typ : Entity_Id);
136 -- Build assignment procedure for one-dimensional arrays of controlled
137 -- types. Other array and slice assignments are expanded in-line, but
138 -- the code expansion for controlled components (when control actions
139 -- are active) can lead to very large blocks that GCC3 handles poorly.
141 procedure Build_Variant_Record_Equality (Typ : Entity_Id);
142 -- Create An Equality function for the non-tagged variant record 'Typ'
143 -- and attach it to the TSS list
145 procedure Check_Stream_Attributes (Typ : Entity_Id);
146 -- Check that if a limited extension has a parent with user-defined stream
147 -- attributes, and does not itself have user-defined stream-attributes,
148 -- then any limited component of the extension also has the corresponding
149 -- user-defined stream attributes.
151 procedure Clean_Task_Names
153 Proc_Id : Entity_Id);
154 -- If an initialization procedure includes calls to generate names
155 -- for task subcomponents, indicate that secondary stack cleanup is
156 -- needed after an initialization. Typ is the component type, and Proc_Id
157 -- the initialization procedure for the enclosing composite type.
159 procedure Expand_Tagged_Root (T : Entity_Id);
160 -- Add a field _Tag at the beginning of the record. This field carries
161 -- the value of the access to the Dispatch table. This procedure is only
162 -- called on root type, the _Tag field being inherited by the descendants.
164 procedure Expand_Record_Controller (T : Entity_Id);
165 -- T must be a record type that Has_Controlled_Component. Add a field
166 -- _controller of type Record_Controller or Limited_Record_Controller
169 procedure Freeze_Array_Type (N : Node_Id);
170 -- Freeze an array type. Deals with building the initialization procedure,
171 -- creating the packed array type for a packed array and also with the
172 -- creation of the controlling procedures for the controlled case. The
173 -- argument N is the N_Freeze_Entity node for the type.
175 procedure Freeze_Enumeration_Type (N : Node_Id);
176 -- Freeze enumeration type with non-standard representation. Builds the
177 -- array and function needed to convert between enumeration pos and
178 -- enumeration representation values. N is the N_Freeze_Entity node
181 procedure Freeze_Record_Type (N : Node_Id);
182 -- Freeze record type. Builds all necessary discriminant checking
183 -- and other ancillary functions, and builds dispatch tables where
184 -- needed. The argument N is the N_Freeze_Entity node. This processing
185 -- applies only to E_Record_Type entities, not to class wide types,
186 -- record subtypes, or private types.
188 procedure Freeze_Stream_Operations (N : Node_Id; Typ : Entity_Id);
189 -- Treat user-defined stream operations as renaming_as_body if the
190 -- subprogram they rename is not frozen when the type is frozen.
192 procedure Initialization_Warning (E : Entity_Id);
193 -- If static elaboration of the package is requested, indicate
194 -- when a type does meet the conditions for static initialization. If
195 -- E is a type, it has components that have no static initialization.
196 -- if E is an entity, its initial expression is not compile-time known.
198 function Init_Formals (Typ : Entity_Id) return List_Id;
199 -- This function builds the list of formals for an initialization routine.
200 -- The first formal is always _Init with the given type. For task value
201 -- record types and types containing tasks, three additional formals are
204 -- _Master : Master_Id
205 -- _Chain : in out Activation_Chain
206 -- _Task_Name : String
208 -- The caller must append additional entries for discriminants if required.
210 function In_Runtime (E : Entity_Id) return Boolean;
211 -- Check if E is defined in the RTL (in a child of Ada or System). Used
212 -- to avoid to bring in the overhead of _Input, _Output for tagged types.
214 function Is_Variable_Size_Record (E : Entity_Id) return Boolean;
215 -- Returns true if E has variable size components
217 function Make_Eq_Case
220 Discr : Entity_Id := Empty) return List_Id;
221 -- Building block for variant record equality. Defined to share the code
222 -- between the tagged and non-tagged case. Given a Component_List node CL,
223 -- it generates an 'if' followed by a 'case' statement that compares all
224 -- components of local temporaries named X and Y (that are declared as
225 -- formals at some upper level). E provides the Sloc to be used for the
226 -- generated code. Discr is used as the case statement switch in the case
227 -- of Unchecked_Union equality.
231 L : List_Id) return Node_Id;
232 -- Building block for variant record equality. Defined to share the code
233 -- between the tagged and non-tagged case. Given the list of components
234 -- (or discriminants) L, it generates a return statement that compares all
235 -- components of local temporaries named X and Y (that are declared as
236 -- formals at some upper level). E provides the Sloc to be used for the
239 procedure Make_Predefined_Primitive_Specs
240 (Tag_Typ : Entity_Id;
241 Predef_List : out List_Id;
242 Renamed_Eq : out Entity_Id);
243 -- Create a list with the specs of the predefined primitive operations.
244 -- For tagged types that are interfaces all these primitives are defined
247 -- The following entries are present for all tagged types, and provide
248 -- the results of the corresponding attribute applied to the object.
249 -- Dispatching is required in general, since the result of the attribute
250 -- will vary with the actual object subtype.
252 -- _alignment provides result of 'Alignment attribute
253 -- _size provides result of 'Size attribute
254 -- typSR provides result of 'Read attribute
255 -- typSW provides result of 'Write attribute
256 -- typSI provides result of 'Input attribute
257 -- typSO provides result of 'Output attribute
259 -- The following entries are additionally present for non-limited tagged
260 -- types, and implement additional dispatching operations for predefined
263 -- _equality implements "=" operator
264 -- _assign implements assignment operation
265 -- typDF implements deep finalization
266 -- typDA implements deep adjust
268 -- The latter two are empty procedures unless the type contains some
269 -- controlled components that require finalization actions (the deep
270 -- in the name refers to the fact that the action applies to components).
272 -- The list is returned in Predef_List. The Parameter Renamed_Eq either
273 -- returns the value Empty, or else the defining unit name for the
274 -- predefined equality function in the case where the type has a primitive
275 -- operation that is a renaming of predefined equality (but only if there
276 -- is also an overriding user-defined equality function). The returned
277 -- Renamed_Eq will be passed to the corresponding parameter of
278 -- Predefined_Primitive_Bodies.
280 function Has_New_Non_Standard_Rep (T : Entity_Id) return Boolean;
281 -- returns True if there are representation clauses for type T that are not
282 -- inherited. If the result is false, the init_proc and the discriminant
283 -- checking functions of the parent can be reused by a derived type.
285 procedure Make_Controlling_Function_Wrappers
286 (Tag_Typ : Entity_Id;
287 Decl_List : out List_Id;
288 Body_List : out List_Id);
289 -- Ada 2005 (AI-391): Makes specs and bodies for the wrapper functions
290 -- associated with inherited functions with controlling results which
291 -- are not overridden. The body of each wrapper function consists solely
292 -- of a return statement whose expression is an extension aggregate
293 -- invoking the inherited subprogram's parent subprogram and extended
294 -- with a null association list.
296 procedure Make_Null_Procedure_Specs
297 (Tag_Typ : Entity_Id;
298 Decl_List : out List_Id);
299 -- Ada 2005 (AI-251): Makes specs for null procedures associated with any
300 -- null procedures inherited from an interface type that have not been
301 -- overridden. Only one null procedure will be created for a given set of
302 -- inherited null procedures with homographic profiles.
304 function Predef_Spec_Or_Body
309 Ret_Type : Entity_Id := Empty;
310 For_Body : Boolean := False) return Node_Id;
311 -- This function generates the appropriate expansion for a predefined
312 -- primitive operation specified by its name, parameter profile and
313 -- return type (Empty means this is a procedure). If For_Body is false,
314 -- then the returned node is a subprogram declaration. If For_Body is
315 -- true, then the returned node is a empty subprogram body containing
316 -- no declarations and no statements.
318 function Predef_Stream_Attr_Spec
321 Name : TSS_Name_Type;
322 For_Body : Boolean := False) return Node_Id;
323 -- Specialized version of Predef_Spec_Or_Body that apply to read, write,
324 -- input and output attribute whose specs are constructed in Exp_Strm.
326 function Predef_Deep_Spec
329 Name : TSS_Name_Type;
330 For_Body : Boolean := False) return Node_Id;
331 -- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
332 -- and _deep_finalize
334 function Predefined_Primitive_Bodies
335 (Tag_Typ : Entity_Id;
336 Renamed_Eq : Entity_Id) return List_Id;
337 -- Create the bodies of the predefined primitives that are described in
338 -- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
339 -- the defining unit name of the type's predefined equality as returned
340 -- by Make_Predefined_Primitive_Specs.
342 function Predefined_Primitive_Freeze (Tag_Typ : Entity_Id) return List_Id;
343 -- Freeze entities of all predefined primitive operations. This is needed
344 -- because the bodies of these operations do not normally do any freezing.
346 function Stream_Operation_OK
348 Operation : TSS_Name_Type) return Boolean;
349 -- Check whether the named stream operation must be emitted for a given
350 -- type. The rules for inheritance of stream attributes by type extensions
351 -- are enforced by this function. Furthermore, various restrictions prevent
352 -- the generation of these operations, as a useful optimization or for
353 -- certification purposes.
355 ---------------------
356 -- Add_Final_Chain --
357 ---------------------
359 function Add_Final_Chain (Def_Id : Entity_Id) return Entity_Id is
360 Loc : constant Source_Ptr := Sloc (Def_Id);
365 Make_Defining_Identifier (Loc,
366 New_External_Name (Chars (Def_Id), 'L'));
368 Append_Freeze_Action (Def_Id,
369 Make_Object_Declaration (Loc,
370 Defining_Identifier => Flist,
372 New_Reference_To (RTE (RE_List_Controller), Loc)));
377 --------------------------
378 -- Adjust_Discriminants --
379 --------------------------
381 -- This procedure attempts to define subtypes for discriminants that are
382 -- more restrictive than those declared. Such a replacement is possible if
383 -- we can demonstrate that values outside the restricted range would cause
384 -- constraint errors in any case. The advantage of restricting the
385 -- discriminant types in this way is that the maximum size of the variant
386 -- record can be calculated more conservatively.
388 -- An example of a situation in which we can perform this type of
389 -- restriction is the following:
391 -- subtype B is range 1 .. 10;
392 -- type Q is array (B range <>) of Integer;
394 -- type V (N : Natural) is record
398 -- In this situation, we can restrict the upper bound of N to 10, since
399 -- any larger value would cause a constraint error in any case.
401 -- There are many situations in which such restriction is possible, but
402 -- for now, we just look for cases like the above, where the component
403 -- in question is a one dimensional array whose upper bound is one of
404 -- the record discriminants. Also the component must not be part of
405 -- any variant part, since then the component does not always exist.
407 procedure Adjust_Discriminants (Rtype : Entity_Id) is
408 Loc : constant Source_Ptr := Sloc (Rtype);
425 Comp := First_Component (Rtype);
426 while Present (Comp) loop
428 -- If our parent is a variant, quit, we do not look at components
429 -- that are in variant parts, because they may not always exist.
431 P := Parent (Comp); -- component declaration
432 P := Parent (P); -- component list
434 exit when Nkind (Parent (P)) = N_Variant;
436 -- We are looking for a one dimensional array type
438 Ctyp := Etype (Comp);
440 if not Is_Array_Type (Ctyp)
441 or else Number_Dimensions (Ctyp) > 1
446 -- The lower bound must be constant, and the upper bound is a
447 -- discriminant (which is a discriminant of the current record).
449 Ityp := Etype (First_Index (Ctyp));
450 Lo := Type_Low_Bound (Ityp);
451 Hi := Type_High_Bound (Ityp);
453 if not Compile_Time_Known_Value (Lo)
454 or else Nkind (Hi) /= N_Identifier
455 or else No (Entity (Hi))
456 or else Ekind (Entity (Hi)) /= E_Discriminant
461 -- We have an array with appropriate bounds
463 Loval := Expr_Value (Lo);
464 Discr := Entity (Hi);
465 Dtyp := Etype (Discr);
467 -- See if the discriminant has a known upper bound
469 Dhi := Type_High_Bound (Dtyp);
471 if not Compile_Time_Known_Value (Dhi) then
475 Dhiv := Expr_Value (Dhi);
477 -- See if base type of component array has known upper bound
479 Ahi := Type_High_Bound (Etype (First_Index (Base_Type (Ctyp))));
481 if not Compile_Time_Known_Value (Ahi) then
485 Ahiv := Expr_Value (Ahi);
487 -- The condition for doing the restriction is that the high bound
488 -- of the discriminant is greater than the low bound of the array,
489 -- and is also greater than the high bound of the base type index.
491 if Dhiv > Loval and then Dhiv > Ahiv then
493 -- We can reset the upper bound of the discriminant type to
494 -- whichever is larger, the low bound of the component, or
495 -- the high bound of the base type array index.
497 -- We build a subtype that is declared as
499 -- subtype Tnn is discr_type range discr_type'First .. max;
501 -- And insert this declaration into the tree. The type of the
502 -- discriminant is then reset to this more restricted subtype.
504 Tnn := Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
506 Insert_Action (Declaration_Node (Rtype),
507 Make_Subtype_Declaration (Loc,
508 Defining_Identifier => Tnn,
509 Subtype_Indication =>
510 Make_Subtype_Indication (Loc,
511 Subtype_Mark => New_Occurrence_Of (Dtyp, Loc),
513 Make_Range_Constraint (Loc,
517 Make_Attribute_Reference (Loc,
518 Attribute_Name => Name_First,
519 Prefix => New_Occurrence_Of (Dtyp, Loc)),
521 Make_Integer_Literal (Loc,
522 Intval => UI_Max (Loval, Ahiv)))))));
524 Set_Etype (Discr, Tnn);
528 Next_Component (Comp);
530 end Adjust_Discriminants;
532 ---------------------------
533 -- Build_Array_Init_Proc --
534 ---------------------------
536 procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id) is
537 Loc : constant Source_Ptr := Sloc (Nod);
538 Comp_Type : constant Entity_Id := Component_Type (A_Type);
539 Index_List : List_Id;
541 Body_Stmts : List_Id;
542 Has_Default_Init : Boolean;
544 function Init_Component return List_Id;
545 -- Create one statement to initialize one array component, designated
546 -- by a full set of indices.
548 function Init_One_Dimension (N : Int) return List_Id;
549 -- Create loop to initialize one dimension of the array. The single
550 -- statement in the loop body initializes the inner dimensions if any,
551 -- or else the single component. Note that this procedure is called
552 -- recursively, with N being the dimension to be initialized. A call
553 -- with N greater than the number of dimensions simply generates the
554 -- component initialization, terminating the recursion.
560 function Init_Component return List_Id is
565 Make_Indexed_Component (Loc,
566 Prefix => Make_Identifier (Loc, Name_uInit),
567 Expressions => Index_List);
569 if Needs_Simple_Initialization (Comp_Type) then
570 Set_Assignment_OK (Comp);
572 Make_Assignment_Statement (Loc,
576 (Comp_Type, Nod, Component_Size (A_Type))));
579 Clean_Task_Names (Comp_Type, Proc_Id);
581 Build_Initialization_Call
582 (Loc, Comp, Comp_Type,
583 In_Init_Proc => True,
584 Enclos_Type => A_Type);
588 ------------------------
589 -- Init_One_Dimension --
590 ------------------------
592 function Init_One_Dimension (N : Int) return List_Id is
596 -- If the component does not need initializing, then there is nothing
597 -- to do here, so we return a null body. This occurs when generating
598 -- the dummy Init_Proc needed for Initialize_Scalars processing.
600 if not Has_Non_Null_Base_Init_Proc (Comp_Type)
601 and then not Needs_Simple_Initialization (Comp_Type)
602 and then not Has_Task (Comp_Type)
604 return New_List (Make_Null_Statement (Loc));
606 -- If all dimensions dealt with, we simply initialize the component
608 elsif N > Number_Dimensions (A_Type) then
609 return Init_Component;
611 -- Here we generate the required loop
615 Make_Defining_Identifier (Loc, New_External_Name ('J', N));
617 Append (New_Reference_To (Index, Loc), Index_List);
620 Make_Implicit_Loop_Statement (Nod,
623 Make_Iteration_Scheme (Loc,
624 Loop_Parameter_Specification =>
625 Make_Loop_Parameter_Specification (Loc,
626 Defining_Identifier => Index,
627 Discrete_Subtype_Definition =>
628 Make_Attribute_Reference (Loc,
629 Prefix => Make_Identifier (Loc, Name_uInit),
630 Attribute_Name => Name_Range,
631 Expressions => New_List (
632 Make_Integer_Literal (Loc, N))))),
633 Statements => Init_One_Dimension (N + 1)));
635 end Init_One_Dimension;
637 -- Start of processing for Build_Array_Init_Proc
640 -- Nothing to generate in the following cases:
642 -- 1. Initialization is suppressed for the type
643 -- 2. The type is a value type, in the CIL sense.
644 -- 3. An initialization already exists for the base type
646 if Suppress_Init_Proc (A_Type)
647 or else Is_Value_Type (Comp_Type)
648 or else Present (Base_Init_Proc (A_Type))
653 Index_List := New_List;
655 -- We need an initialization procedure if any of the following is true:
657 -- 1. The component type has an initialization procedure
658 -- 2. The component type needs simple initialization
659 -- 3. Tasks are present
660 -- 4. The type is marked as a public entity
662 -- The reason for the public entity test is to deal properly with the
663 -- Initialize_Scalars pragma. This pragma can be set in the client and
664 -- not in the declaring package, this means the client will make a call
665 -- to the initialization procedure (because one of conditions 1-3 must
666 -- apply in this case), and we must generate a procedure (even if it is
667 -- null) to satisfy the call in this case.
669 -- Exception: do not build an array init_proc for a type whose root
670 -- type is Standard.String or Standard.Wide_[Wide_]String, since there
671 -- is no place to put the code, and in any case we handle initialization
672 -- of such types (in the Initialize_Scalars case, that's the only time
673 -- the issue arises) in a special manner anyway which does not need an
676 Has_Default_Init := Has_Non_Null_Base_Init_Proc (Comp_Type)
677 or else Needs_Simple_Initialization (Comp_Type)
678 or else Has_Task (Comp_Type);
681 or else (not Restriction_Active (No_Initialize_Scalars)
682 and then Is_Public (A_Type)
683 and then Root_Type (A_Type) /= Standard_String
684 and then Root_Type (A_Type) /= Standard_Wide_String
685 and then Root_Type (A_Type) /= Standard_Wide_Wide_String)
688 Make_Defining_Identifier (Loc,
689 Chars => Make_Init_Proc_Name (A_Type));
691 -- If No_Default_Initialization restriction is active, then we don't
692 -- want to build an init_proc, but we need to mark that an init_proc
693 -- would be needed if this restriction was not active (so that we can
694 -- detect attempts to call it), so set a dummy init_proc in place.
695 -- This is only done though when actual default initialization is
696 -- needed (and not done when only Is_Public is True), since otherwise
697 -- objects such as arrays of scalars could be wrongly flagged as
698 -- violating the restriction.
700 if Restriction_Active (No_Default_Initialization) then
701 if Has_Default_Init then
702 Set_Init_Proc (A_Type, Proc_Id);
708 Body_Stmts := Init_One_Dimension (1);
711 Make_Subprogram_Body (Loc,
713 Make_Procedure_Specification (Loc,
714 Defining_Unit_Name => Proc_Id,
715 Parameter_Specifications => Init_Formals (A_Type)),
716 Declarations => New_List,
717 Handled_Statement_Sequence =>
718 Make_Handled_Sequence_Of_Statements (Loc,
719 Statements => Body_Stmts)));
721 Set_Ekind (Proc_Id, E_Procedure);
722 Set_Is_Public (Proc_Id, Is_Public (A_Type));
723 Set_Is_Internal (Proc_Id);
724 Set_Has_Completion (Proc_Id);
726 if not Debug_Generated_Code then
727 Set_Debug_Info_Off (Proc_Id);
730 -- Set inlined unless controlled stuff or tasks around, in which
731 -- case we do not want to inline, because nested stuff may cause
732 -- difficulties in inter-unit inlining, and furthermore there is
733 -- in any case no point in inlining such complex init procs.
735 if not Has_Task (Proc_Id)
736 and then not Needs_Finalization (Proc_Id)
738 Set_Is_Inlined (Proc_Id);
741 -- Associate Init_Proc with type, and determine if the procedure
742 -- is null (happens because of the Initialize_Scalars pragma case,
743 -- where we have to generate a null procedure in case it is called
744 -- by a client with Initialize_Scalars set). Such procedures have
745 -- to be generated, but do not have to be called, so we mark them
746 -- as null to suppress the call.
748 Set_Init_Proc (A_Type, Proc_Id);
750 if List_Length (Body_Stmts) = 1
751 and then Nkind (First (Body_Stmts)) = N_Null_Statement
753 Set_Is_Null_Init_Proc (Proc_Id);
756 -- Try to build a static aggregate to initialize statically
757 -- objects of the type. This can only be done for constrained
758 -- one-dimensional arrays with static bounds.
760 Set_Static_Initialization
762 Build_Equivalent_Array_Aggregate (First_Subtype (A_Type)));
765 end Build_Array_Init_Proc;
767 -----------------------------
768 -- Build_Class_Wide_Master --
769 -----------------------------
771 procedure Build_Class_Wide_Master (T : Entity_Id) is
772 Loc : constant Source_Ptr := Sloc (T);
779 -- Nothing to do if there is no task hierarchy
781 if Restriction_Active (No_Task_Hierarchy) then
785 -- Find declaration that created the access type: either a type
786 -- declaration, or an object declaration with an access definition,
787 -- in which case the type is anonymous.
790 P := Associated_Node_For_Itype (T);
795 -- Nothing to do if we already built a master entity for this scope
797 if not Has_Master_Entity (Scope (T)) then
799 -- First build the master entity
800 -- _Master : constant Master_Id := Current_Master.all;
801 -- and insert it just before the current declaration.
804 Make_Object_Declaration (Loc,
805 Defining_Identifier =>
806 Make_Defining_Identifier (Loc, Name_uMaster),
807 Constant_Present => True,
808 Object_Definition => New_Reference_To (Standard_Integer, Loc),
810 Make_Explicit_Dereference (Loc,
811 New_Reference_To (RTE (RE_Current_Master), Loc)));
813 Insert_Action (P, Decl);
815 Set_Has_Master_Entity (Scope (T));
817 -- Now mark the containing scope as a task master. Masters
818 -- associated with return statements are already marked at
819 -- this stage (see Analyze_Subprogram_Body).
821 if Ekind (Current_Scope) /= E_Return_Statement then
823 while Nkind (Par) /= N_Compilation_Unit loop
826 -- If we fall off the top, we are at the outer level, and the
827 -- environment task is our effective master, so nothing to mark.
830 (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body)
832 Set_Is_Task_Master (Par, True);
839 -- Now define the renaming of the master_id
842 Make_Defining_Identifier (Loc,
843 New_External_Name (Chars (T), 'M'));
846 Make_Object_Renaming_Declaration (Loc,
847 Defining_Identifier => M_Id,
848 Subtype_Mark => New_Reference_To (Standard_Integer, Loc),
849 Name => Make_Identifier (Loc, Name_uMaster));
850 Insert_Before (P, Decl);
853 Set_Master_Id (T, M_Id);
856 when RE_Not_Available =>
858 end Build_Class_Wide_Master;
860 --------------------------------
861 -- Build_Discr_Checking_Funcs --
862 --------------------------------
864 procedure Build_Discr_Checking_Funcs (N : Node_Id) is
867 Enclosing_Func_Id : Entity_Id;
872 function Build_Case_Statement
873 (Case_Id : Entity_Id;
874 Variant : Node_Id) return Node_Id;
875 -- Build a case statement containing only two alternatives. The first
876 -- alternative corresponds exactly to the discrete choices given on the
877 -- variant with contains the components that we are generating the
878 -- checks for. If the discriminant is one of these return False. The
879 -- second alternative is an OTHERS choice that will return True
880 -- indicating the discriminant did not match.
882 function Build_Dcheck_Function
883 (Case_Id : Entity_Id;
884 Variant : Node_Id) return Entity_Id;
885 -- Build the discriminant checking function for a given variant
887 procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id);
888 -- Builds the discriminant checking function for each variant of the
889 -- given variant part of the record type.
891 --------------------------
892 -- Build_Case_Statement --
893 --------------------------
895 function Build_Case_Statement
896 (Case_Id : Entity_Id;
897 Variant : Node_Id) return Node_Id
899 Alt_List : constant List_Id := New_List;
900 Actuals_List : List_Id;
902 Case_Alt_Node : Node_Id;
904 Choice_List : List_Id;
906 Return_Node : Node_Id;
909 Case_Node := New_Node (N_Case_Statement, Loc);
911 -- Replace the discriminant which controls the variant, with the name
912 -- of the formal of the checking function.
914 Set_Expression (Case_Node,
915 Make_Identifier (Loc, Chars (Case_Id)));
917 Choice := First (Discrete_Choices (Variant));
919 if Nkind (Choice) = N_Others_Choice then
920 Choice_List := New_Copy_List (Others_Discrete_Choices (Choice));
922 Choice_List := New_Copy_List (Discrete_Choices (Variant));
925 if not Is_Empty_List (Choice_List) then
926 Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
927 Set_Discrete_Choices (Case_Alt_Node, Choice_List);
929 -- In case this is a nested variant, we need to return the result
930 -- of the discriminant checking function for the immediately
931 -- enclosing variant.
933 if Present (Enclosing_Func_Id) then
934 Actuals_List := New_List;
936 D := First_Discriminant (Rec_Id);
937 while Present (D) loop
938 Append (Make_Identifier (Loc, Chars (D)), Actuals_List);
939 Next_Discriminant (D);
943 Make_Simple_Return_Statement (Loc,
945 Make_Function_Call (Loc,
947 New_Reference_To (Enclosing_Func_Id, Loc),
948 Parameter_Associations =>
953 Make_Simple_Return_Statement (Loc,
955 New_Reference_To (Standard_False, Loc));
958 Set_Statements (Case_Alt_Node, New_List (Return_Node));
959 Append (Case_Alt_Node, Alt_List);
962 Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
963 Choice_List := New_List (New_Node (N_Others_Choice, Loc));
964 Set_Discrete_Choices (Case_Alt_Node, Choice_List);
967 Make_Simple_Return_Statement (Loc,
969 New_Reference_To (Standard_True, Loc));
971 Set_Statements (Case_Alt_Node, New_List (Return_Node));
972 Append (Case_Alt_Node, Alt_List);
974 Set_Alternatives (Case_Node, Alt_List);
976 end Build_Case_Statement;
978 ---------------------------
979 -- Build_Dcheck_Function --
980 ---------------------------
982 function Build_Dcheck_Function
983 (Case_Id : Entity_Id;
984 Variant : Node_Id) return Entity_Id
988 Parameter_List : List_Id;
992 Body_Node := New_Node (N_Subprogram_Body, Loc);
993 Sequence := Sequence + 1;
996 Make_Defining_Identifier (Loc,
997 Chars => New_External_Name (Chars (Rec_Id), 'D', Sequence));
999 Spec_Node := New_Node (N_Function_Specification, Loc);
1000 Set_Defining_Unit_Name (Spec_Node, Func_Id);
1002 Parameter_List := Build_Discriminant_Formals (Rec_Id, False);
1004 Set_Parameter_Specifications (Spec_Node, Parameter_List);
1005 Set_Result_Definition (Spec_Node,
1006 New_Reference_To (Standard_Boolean, Loc));
1007 Set_Specification (Body_Node, Spec_Node);
1008 Set_Declarations (Body_Node, New_List);
1010 Set_Handled_Statement_Sequence (Body_Node,
1011 Make_Handled_Sequence_Of_Statements (Loc,
1012 Statements => New_List (
1013 Build_Case_Statement (Case_Id, Variant))));
1015 Set_Ekind (Func_Id, E_Function);
1016 Set_Mechanism (Func_Id, Default_Mechanism);
1017 Set_Is_Inlined (Func_Id, True);
1018 Set_Is_Pure (Func_Id, True);
1019 Set_Is_Public (Func_Id, Is_Public (Rec_Id));
1020 Set_Is_Internal (Func_Id, True);
1022 if not Debug_Generated_Code then
1023 Set_Debug_Info_Off (Func_Id);
1026 Analyze (Body_Node);
1028 Append_Freeze_Action (Rec_Id, Body_Node);
1029 Set_Dcheck_Function (Variant, Func_Id);
1031 end Build_Dcheck_Function;
1033 ----------------------------
1034 -- Build_Dcheck_Functions --
1035 ----------------------------
1037 procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id) is
1038 Component_List_Node : Node_Id;
1040 Discr_Name : Entity_Id;
1041 Func_Id : Entity_Id;
1043 Saved_Enclosing_Func_Id : Entity_Id;
1046 -- Build the discriminant-checking function for each variant, and
1047 -- label all components of that variant with the function's name.
1048 -- We only Generate a discriminant-checking function when the
1049 -- variant is not empty, to prevent the creation of dead code.
1050 -- The exception to that is when Frontend_Layout_On_Target is set,
1051 -- because the variant record size function generated in package
1052 -- Layout needs to generate calls to all discriminant-checking
1053 -- functions, including those for empty variants.
1055 Discr_Name := Entity (Name (Variant_Part_Node));
1056 Variant := First_Non_Pragma (Variants (Variant_Part_Node));
1058 while Present (Variant) loop
1059 Component_List_Node := Component_List (Variant);
1061 if not Null_Present (Component_List_Node)
1062 or else Frontend_Layout_On_Target
1064 Func_Id := Build_Dcheck_Function (Discr_Name, Variant);
1066 First_Non_Pragma (Component_Items (Component_List_Node));
1068 while Present (Decl) loop
1069 Set_Discriminant_Checking_Func
1070 (Defining_Identifier (Decl), Func_Id);
1072 Next_Non_Pragma (Decl);
1075 if Present (Variant_Part (Component_List_Node)) then
1076 Saved_Enclosing_Func_Id := Enclosing_Func_Id;
1077 Enclosing_Func_Id := Func_Id;
1078 Build_Dcheck_Functions (Variant_Part (Component_List_Node));
1079 Enclosing_Func_Id := Saved_Enclosing_Func_Id;
1083 Next_Non_Pragma (Variant);
1085 end Build_Dcheck_Functions;
1087 -- Start of processing for Build_Discr_Checking_Funcs
1090 -- Only build if not done already
1092 if not Discr_Check_Funcs_Built (N) then
1093 Type_Def := Type_Definition (N);
1095 if Nkind (Type_Def) = N_Record_Definition then
1096 if No (Component_List (Type_Def)) then -- null record.
1099 V := Variant_Part (Component_List (Type_Def));
1102 else pragma Assert (Nkind (Type_Def) = N_Derived_Type_Definition);
1103 if No (Component_List (Record_Extension_Part (Type_Def))) then
1107 (Component_List (Record_Extension_Part (Type_Def)));
1111 Rec_Id := Defining_Identifier (N);
1113 if Present (V) and then not Is_Unchecked_Union (Rec_Id) then
1115 Enclosing_Func_Id := Empty;
1116 Build_Dcheck_Functions (V);
1119 Set_Discr_Check_Funcs_Built (N);
1121 end Build_Discr_Checking_Funcs;
1123 --------------------------------
1124 -- Build_Discriminant_Formals --
1125 --------------------------------
1127 function Build_Discriminant_Formals
1128 (Rec_Id : Entity_Id;
1129 Use_Dl : Boolean) return List_Id
1131 Loc : Source_Ptr := Sloc (Rec_Id);
1132 Parameter_List : constant List_Id := New_List;
1135 Param_Spec_Node : Node_Id;
1138 if Has_Discriminants (Rec_Id) then
1139 D := First_Discriminant (Rec_Id);
1140 while Present (D) loop
1144 Formal := Discriminal (D);
1146 Formal := Make_Defining_Identifier (Loc, Chars (D));
1150 Make_Parameter_Specification (Loc,
1151 Defining_Identifier => Formal,
1153 New_Reference_To (Etype (D), Loc));
1154 Append (Param_Spec_Node, Parameter_List);
1155 Next_Discriminant (D);
1159 return Parameter_List;
1160 end Build_Discriminant_Formals;
1162 --------------------------------------
1163 -- Build_Equivalent_Array_Aggregate --
1164 --------------------------------------
1166 function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id is
1167 Loc : constant Source_Ptr := Sloc (T);
1168 Comp_Type : constant Entity_Id := Component_Type (T);
1169 Index_Type : constant Entity_Id := Etype (First_Index (T));
1170 Proc : constant Entity_Id := Base_Init_Proc (T);
1176 if not Is_Constrained (T)
1177 or else Number_Dimensions (T) > 1
1180 Initialization_Warning (T);
1184 Lo := Type_Low_Bound (Index_Type);
1185 Hi := Type_High_Bound (Index_Type);
1187 if not Compile_Time_Known_Value (Lo)
1188 or else not Compile_Time_Known_Value (Hi)
1190 Initialization_Warning (T);
1194 if Is_Record_Type (Comp_Type)
1195 and then Present (Base_Init_Proc (Comp_Type))
1197 Expr := Static_Initialization (Base_Init_Proc (Comp_Type));
1200 Initialization_Warning (T);
1205 Initialization_Warning (T);
1209 Aggr := Make_Aggregate (Loc, No_List, New_List);
1210 Set_Etype (Aggr, T);
1211 Set_Aggregate_Bounds (Aggr,
1213 Low_Bound => New_Copy (Lo),
1214 High_Bound => New_Copy (Hi)));
1215 Set_Parent (Aggr, Parent (Proc));
1217 Append_To (Component_Associations (Aggr),
1218 Make_Component_Association (Loc,
1222 Low_Bound => New_Copy (Lo),
1223 High_Bound => New_Copy (Hi))),
1224 Expression => Expr));
1226 if Static_Array_Aggregate (Aggr) then
1229 Initialization_Warning (T);
1232 end Build_Equivalent_Array_Aggregate;
1234 ---------------------------------------
1235 -- Build_Equivalent_Record_Aggregate --
1236 ---------------------------------------
1238 function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id is
1242 -- Start of processing for Build_Equivalent_Record_Aggregate
1245 if not Is_Record_Type (T)
1246 or else Has_Discriminants (T)
1247 or else Is_Limited_Type (T)
1248 or else Has_Non_Standard_Rep (T)
1250 Initialization_Warning (T);
1254 Comp := First_Component (T);
1256 -- A null record needs no warning
1262 while Present (Comp) loop
1264 -- Array components are acceptable if initialized by a positional
1265 -- aggregate with static components.
1267 if Is_Array_Type (Etype (Comp)) then
1269 Comp_Type : constant Entity_Id := Component_Type (Etype (Comp));
1272 if Nkind (Parent (Comp)) /= N_Component_Declaration
1273 or else No (Expression (Parent (Comp)))
1274 or else Nkind (Expression (Parent (Comp))) /= N_Aggregate
1276 Initialization_Warning (T);
1279 elsif Is_Scalar_Type (Component_Type (Etype (Comp)))
1281 (not Compile_Time_Known_Value (Type_Low_Bound (Comp_Type))
1282 or else not Compile_Time_Known_Value
1283 (Type_High_Bound (Comp_Type)))
1285 Initialization_Warning (T);
1289 not Static_Array_Aggregate (Expression (Parent (Comp)))
1291 Initialization_Warning (T);
1296 elsif Is_Scalar_Type (Etype (Comp)) then
1297 if Nkind (Parent (Comp)) /= N_Component_Declaration
1298 or else No (Expression (Parent (Comp)))
1299 or else not Compile_Time_Known_Value (Expression (Parent (Comp)))
1301 Initialization_Warning (T);
1305 -- For now, other types are excluded
1308 Initialization_Warning (T);
1312 Next_Component (Comp);
1315 -- All components have static initialization. Build positional
1316 -- aggregate from the given expressions or defaults.
1318 Agg := Make_Aggregate (Sloc (T), New_List, New_List);
1319 Set_Parent (Agg, Parent (T));
1321 Comp := First_Component (T);
1322 while Present (Comp) loop
1324 (New_Copy_Tree (Expression (Parent (Comp))), Expressions (Agg));
1325 Next_Component (Comp);
1328 Analyze_And_Resolve (Agg, T);
1330 end Build_Equivalent_Record_Aggregate;
1332 -------------------------------
1333 -- Build_Initialization_Call --
1334 -------------------------------
1336 -- References to a discriminant inside the record type declaration can
1337 -- appear either in the subtype_indication to constrain a record or an
1338 -- array, or as part of a larger expression given for the initial value
1339 -- of a component. In both of these cases N appears in the record
1340 -- initialization procedure and needs to be replaced by the formal
1341 -- parameter of the initialization procedure which corresponds to that
1344 -- In the example below, references to discriminants D1 and D2 in proc_1
1345 -- are replaced by references to formals with the same name
1348 -- A similar replacement is done for calls to any record initialization
1349 -- procedure for any components that are themselves of a record type.
1351 -- type R (D1, D2 : Integer) is record
1352 -- X : Integer := F * D1;
1353 -- Y : Integer := F * D2;
1356 -- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
1360 -- Out_2.X := F * D1;
1361 -- Out_2.Y := F * D2;
1364 function Build_Initialization_Call
1368 In_Init_Proc : Boolean := False;
1369 Enclos_Type : Entity_Id := Empty;
1370 Discr_Map : Elist_Id := New_Elmt_List;
1371 With_Default_Init : Boolean := False) return List_Id
1373 First_Arg : Node_Id;
1379 Proc : constant Entity_Id := Base_Init_Proc (Typ);
1380 Init_Type : constant Entity_Id := Etype (First_Formal (Proc));
1381 Full_Init_Type : constant Entity_Id := Underlying_Type (Init_Type);
1382 Res : constant List_Id := New_List;
1383 Full_Type : Entity_Id := Typ;
1384 Controller_Typ : Entity_Id;
1387 -- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
1388 -- is active (in which case we make the call anyway, since in the
1389 -- actual compiled client it may be non null).
1390 -- Also nothing to do for value types.
1392 if (Is_Null_Init_Proc (Proc) and then not Init_Or_Norm_Scalars)
1393 or else Is_Value_Type (Typ)
1394 or else Is_Value_Type (Component_Type (Typ))
1399 -- Go to full view if private type. In the case of successive
1400 -- private derivations, this can require more than one step.
1402 while Is_Private_Type (Full_Type)
1403 and then Present (Full_View (Full_Type))
1405 Full_Type := Full_View (Full_Type);
1408 -- If Typ is derived, the procedure is the initialization procedure for
1409 -- the root type. Wrap the argument in an conversion to make it type
1410 -- honest. Actually it isn't quite type honest, because there can be
1411 -- conflicts of views in the private type case. That is why we set
1412 -- Conversion_OK in the conversion node.
1414 if (Is_Record_Type (Typ)
1415 or else Is_Array_Type (Typ)
1416 or else Is_Private_Type (Typ))
1417 and then Init_Type /= Base_Type (Typ)
1419 First_Arg := OK_Convert_To (Etype (Init_Type), Id_Ref);
1420 Set_Etype (First_Arg, Init_Type);
1423 First_Arg := Id_Ref;
1426 Args := New_List (Convert_Concurrent (First_Arg, Typ));
1428 -- In the tasks case, add _Master as the value of the _Master parameter
1429 -- and _Chain as the value of the _Chain parameter. At the outer level,
1430 -- these will be variables holding the corresponding values obtained
1431 -- from GNARL. At inner levels, they will be the parameters passed down
1432 -- through the outer routines.
1434 if Has_Task (Full_Type) then
1435 if Restriction_Active (No_Task_Hierarchy) then
1437 -- See comments in System.Tasking.Initialization.Init_RTS
1438 -- for the value 3 (should be rtsfindable constant ???)
1440 Append_To (Args, Make_Integer_Literal (Loc, 3));
1443 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
1446 Append_To (Args, Make_Identifier (Loc, Name_uChain));
1448 -- Ada 2005 (AI-287): In case of default initialized components
1449 -- with tasks, we generate a null string actual parameter.
1450 -- This is just a workaround that must be improved later???
1452 if With_Default_Init then
1454 Make_String_Literal (Loc,
1459 Build_Task_Image_Decls (Loc, Id_Ref, Enclos_Type, In_Init_Proc);
1460 Decl := Last (Decls);
1463 New_Occurrence_Of (Defining_Identifier (Decl), Loc));
1464 Append_List (Decls, Res);
1472 -- Add discriminant values if discriminants are present
1474 if Has_Discriminants (Full_Init_Type) then
1475 Discr := First_Discriminant (Full_Init_Type);
1477 while Present (Discr) loop
1479 -- If this is a discriminated concurrent type, the init_proc
1480 -- for the corresponding record is being called. Use that type
1481 -- directly to find the discriminant value, to handle properly
1482 -- intervening renamed discriminants.
1485 T : Entity_Id := Full_Type;
1488 if Is_Protected_Type (T) then
1489 T := Corresponding_Record_Type (T);
1491 elsif Is_Private_Type (T)
1492 and then Present (Underlying_Full_View (T))
1493 and then Is_Protected_Type (Underlying_Full_View (T))
1495 T := Corresponding_Record_Type (Underlying_Full_View (T));
1499 Get_Discriminant_Value (
1502 Discriminant_Constraint (Full_Type));
1505 if In_Init_Proc then
1507 -- Replace any possible references to the discriminant in the
1508 -- call to the record initialization procedure with references
1509 -- to the appropriate formal parameter.
1511 if Nkind (Arg) = N_Identifier
1512 and then Ekind (Entity (Arg)) = E_Discriminant
1514 Arg := New_Reference_To (Discriminal (Entity (Arg)), Loc);
1516 -- Case of access discriminants. We replace the reference
1517 -- to the type by a reference to the actual object
1519 elsif Nkind (Arg) = N_Attribute_Reference
1520 and then Is_Access_Type (Etype (Arg))
1521 and then Is_Entity_Name (Prefix (Arg))
1522 and then Is_Type (Entity (Prefix (Arg)))
1525 Make_Attribute_Reference (Loc,
1526 Prefix => New_Copy (Prefix (Id_Ref)),
1527 Attribute_Name => Name_Unrestricted_Access);
1529 -- Otherwise make a copy of the default expression. Note that
1530 -- we use the current Sloc for this, because we do not want the
1531 -- call to appear to be at the declaration point. Within the
1532 -- expression, replace discriminants with their discriminals.
1536 New_Copy_Tree (Arg, Map => Discr_Map, New_Sloc => Loc);
1540 if Is_Constrained (Full_Type) then
1541 Arg := Duplicate_Subexpr_No_Checks (Arg);
1543 -- The constraints come from the discriminant default exps,
1544 -- they must be reevaluated, so we use New_Copy_Tree but we
1545 -- ensure the proper Sloc (for any embedded calls).
1547 Arg := New_Copy_Tree (Arg, New_Sloc => Loc);
1551 -- Ada 2005 (AI-287): In case of default initialized components,
1552 -- we need to generate the corresponding selected component node
1553 -- to access the discriminant value. In other cases this is not
1554 -- required because we are inside the init proc and we use the
1555 -- corresponding formal.
1557 if With_Default_Init
1558 and then Nkind (Id_Ref) = N_Selected_Component
1559 and then Nkind (Arg) = N_Identifier
1562 Make_Selected_Component (Loc,
1563 Prefix => New_Copy_Tree (Prefix (Id_Ref)),
1564 Selector_Name => Arg));
1566 Append_To (Args, Arg);
1569 Next_Discriminant (Discr);
1573 -- If this is a call to initialize the parent component of a derived
1574 -- tagged type, indicate that the tag should not be set in the parent.
1576 if Is_Tagged_Type (Full_Init_Type)
1577 and then not Is_CPP_Class (Full_Init_Type)
1578 and then Nkind (Id_Ref) = N_Selected_Component
1579 and then Chars (Selector_Name (Id_Ref)) = Name_uParent
1581 Append_To (Args, New_Occurrence_Of (Standard_False, Loc));
1585 Make_Procedure_Call_Statement (Loc,
1586 Name => New_Occurrence_Of (Proc, Loc),
1587 Parameter_Associations => Args));
1589 if Needs_Finalization (Typ)
1590 and then Nkind (Id_Ref) = N_Selected_Component
1592 if Chars (Selector_Name (Id_Ref)) /= Name_uParent then
1593 Append_List_To (Res,
1595 Ref => New_Copy_Tree (First_Arg),
1598 Find_Final_List (Typ, New_Copy_Tree (First_Arg)),
1599 With_Attach => Make_Integer_Literal (Loc, 1)));
1601 -- If the enclosing type is an extension with new controlled
1602 -- components, it has his own record controller. If the parent
1603 -- also had a record controller, attach it to the new one.
1605 -- Build_Init_Statements relies on the fact that in this specific
1606 -- case the last statement of the result is the attach call to
1607 -- the controller. If this is changed, it must be synchronized.
1609 elsif Present (Enclos_Type)
1610 and then Has_New_Controlled_Component (Enclos_Type)
1611 and then Has_Controlled_Component (Typ)
1613 if Is_Inherently_Limited_Type (Typ) then
1614 Controller_Typ := RTE (RE_Limited_Record_Controller);
1616 Controller_Typ := RTE (RE_Record_Controller);
1619 Append_List_To (Res,
1622 Make_Selected_Component (Loc,
1623 Prefix => New_Copy_Tree (First_Arg),
1624 Selector_Name => Make_Identifier (Loc, Name_uController)),
1625 Typ => Controller_Typ,
1626 Flist_Ref => Find_Final_List (Typ, New_Copy_Tree (First_Arg)),
1627 With_Attach => Make_Integer_Literal (Loc, 1)));
1634 when RE_Not_Available =>
1636 end Build_Initialization_Call;
1638 ---------------------------
1639 -- Build_Master_Renaming --
1640 ---------------------------
1642 function Build_Master_Renaming
1644 T : Entity_Id) return Entity_Id
1646 Loc : constant Source_Ptr := Sloc (N);
1651 -- Nothing to do if there is no task hierarchy
1653 if Restriction_Active (No_Task_Hierarchy) then
1658 Make_Defining_Identifier (Loc,
1659 New_External_Name (Chars (T), 'M'));
1662 Make_Object_Renaming_Declaration (Loc,
1663 Defining_Identifier => M_Id,
1664 Subtype_Mark => New_Reference_To (RTE (RE_Master_Id), Loc),
1665 Name => Make_Identifier (Loc, Name_uMaster));
1666 Insert_Before (N, Decl);
1671 when RE_Not_Available =>
1673 end Build_Master_Renaming;
1675 ---------------------------
1676 -- Build_Master_Renaming --
1677 ---------------------------
1679 procedure Build_Master_Renaming (N : Node_Id; T : Entity_Id) is
1683 -- Nothing to do if there is no task hierarchy
1685 if Restriction_Active (No_Task_Hierarchy) then
1689 M_Id := Build_Master_Renaming (N, T);
1690 Set_Master_Id (T, M_Id);
1693 when RE_Not_Available =>
1695 end Build_Master_Renaming;
1697 ----------------------------
1698 -- Build_Record_Init_Proc --
1699 ----------------------------
1701 procedure Build_Record_Init_Proc (N : Node_Id; Pe : Entity_Id) is
1702 Loc : Source_Ptr := Sloc (N);
1703 Discr_Map : constant Elist_Id := New_Elmt_List;
1704 Proc_Id : Entity_Id;
1705 Rec_Type : Entity_Id;
1706 Set_Tag : Entity_Id := Empty;
1708 function Build_Assignment (Id : Entity_Id; N : Node_Id) return List_Id;
1709 -- Build a assignment statement node which assigns to record component
1710 -- its default expression if defined. The assignment left hand side is
1711 -- marked Assignment_OK so that initialization of limited private
1712 -- records works correctly, Return also the adjustment call for
1713 -- controlled objects
1715 procedure Build_Discriminant_Assignments (Statement_List : List_Id);
1716 -- If the record has discriminants, adds assignment statements to
1717 -- statement list to initialize the discriminant values from the
1718 -- arguments of the initialization procedure.
1720 function Build_Init_Statements (Comp_List : Node_Id) return List_Id;
1721 -- Build a list representing a sequence of statements which initialize
1722 -- components of the given component list. This may involve building
1723 -- case statements for the variant parts.
1725 function Build_Init_Call_Thru (Parameters : List_Id) return List_Id;
1726 -- Given a non-tagged type-derivation that declares discriminants,
1729 -- type R (R1, R2 : Integer) is record ... end record;
1731 -- type D (D1 : Integer) is new R (1, D1);
1733 -- we make the _init_proc of D be
1735 -- procedure _init_proc(X : D; D1 : Integer) is
1737 -- _init_proc( R(X), 1, D1);
1740 -- This function builds the call statement in this _init_proc.
1742 procedure Build_Init_Procedure;
1743 -- Build the tree corresponding to the procedure specification and body
1744 -- of the initialization procedure (by calling all the preceding
1745 -- auxiliary routines), and install it as the _init TSS.
1747 procedure Build_Offset_To_Top_Functions;
1748 -- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
1749 -- and body of the Offset_To_Top function that is generated when the
1750 -- parent of a type with discriminants has secondary dispatch tables.
1752 procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id);
1753 -- Add range checks to components of discriminated records. S is a
1754 -- subtype indication of a record component. Check_List is a list
1755 -- to which the check actions are appended.
1757 function Component_Needs_Simple_Initialization
1758 (T : Entity_Id) return Boolean;
1759 -- Determines if a component needs simple initialization, given its type
1760 -- T. This is the same as Needs_Simple_Initialization except for the
1761 -- following difference: the types Tag and Interface_Tag, that are
1762 -- access types which would normally require simple initialization to
1763 -- null, do not require initialization as components, since they are
1764 -- explicitly initialized by other means.
1766 procedure Constrain_Array
1768 Check_List : List_Id);
1769 -- Called from Build_Record_Checks.
1770 -- Apply a list of index constraints to an unconstrained array type.
1771 -- The first parameter is the entity for the resulting subtype.
1772 -- Check_List is a list to which the check actions are appended.
1774 procedure Constrain_Index
1777 Check_List : List_Id);
1778 -- Process an index constraint in a constrained array declaration.
1779 -- The constraint can be a subtype name, or a range with or without
1780 -- an explicit subtype mark. The index is the corresponding index of the
1781 -- unconstrained array. S is the range expression. Check_List is a list
1782 -- to which the check actions are appended (called from
1783 -- Build_Record_Checks).
1785 function Parent_Subtype_Renaming_Discrims return Boolean;
1786 -- Returns True for base types N that rename discriminants, else False
1788 function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean;
1789 -- Determines whether a record initialization procedure needs to be
1790 -- generated for the given record type.
1792 ----------------------
1793 -- Build_Assignment --
1794 ----------------------
1796 function Build_Assignment (Id : Entity_Id; N : Node_Id) return List_Id is
1799 Typ : constant Entity_Id := Underlying_Type (Etype (Id));
1800 Kind : Node_Kind := Nkind (N);
1806 Make_Selected_Component (Loc,
1807 Prefix => Make_Identifier (Loc, Name_uInit),
1808 Selector_Name => New_Occurrence_Of (Id, Loc));
1809 Set_Assignment_OK (Lhs);
1811 -- Case of an access attribute applied to the current instance.
1812 -- Replace the reference to the type by a reference to the actual
1813 -- object. (Note that this handles the case of the top level of
1814 -- the expression being given by such an attribute, but does not
1815 -- cover uses nested within an initial value expression. Nested
1816 -- uses are unlikely to occur in practice, but are theoretically
1817 -- possible. It is not clear how to handle them without fully
1818 -- traversing the expression. ???
1820 if Kind = N_Attribute_Reference
1821 and then (Attribute_Name (N) = Name_Unchecked_Access
1823 Attribute_Name (N) = Name_Unrestricted_Access)
1824 and then Is_Entity_Name (Prefix (N))
1825 and then Is_Type (Entity (Prefix (N)))
1826 and then Entity (Prefix (N)) = Rec_Type
1829 Make_Attribute_Reference (Loc,
1830 Prefix => Make_Identifier (Loc, Name_uInit),
1831 Attribute_Name => Name_Unrestricted_Access);
1834 -- Take a copy of Exp to ensure that later copies of this component
1835 -- declaration in derived types see the original tree, not a node
1836 -- rewritten during expansion of the init_proc.
1838 Exp := New_Copy_Tree (Exp);
1841 Make_Assignment_Statement (Loc,
1843 Expression => Exp));
1845 Set_No_Ctrl_Actions (First (Res));
1847 -- Adjust the tag if tagged (because of possible view conversions).
1848 -- Suppress the tag adjustment when VM_Target because VM tags are
1849 -- represented implicitly in objects.
1851 if Is_Tagged_Type (Typ) and then VM_Target = No_VM then
1853 Make_Assignment_Statement (Loc,
1855 Make_Selected_Component (Loc,
1856 Prefix => New_Copy_Tree (Lhs),
1858 New_Reference_To (First_Tag_Component (Typ), Loc)),
1861 Unchecked_Convert_To (RTE (RE_Tag),
1863 (Node (First_Elmt (Access_Disp_Table (Typ))), Loc))));
1866 -- Adjust the component if controlled except if it is an aggregate
1867 -- that will be expanded inline
1869 if Kind = N_Qualified_Expression then
1870 Kind := Nkind (Expression (N));
1873 if Needs_Finalization (Typ)
1874 and then not (Kind = N_Aggregate or else Kind = N_Extension_Aggregate)
1875 and then not Is_Inherently_Limited_Type (Typ)
1877 Append_List_To (Res,
1879 Ref => New_Copy_Tree (Lhs),
1882 Find_Final_List (Etype (Id), New_Copy_Tree (Lhs)),
1883 With_Attach => Make_Integer_Literal (Loc, 1)));
1889 when RE_Not_Available =>
1891 end Build_Assignment;
1893 ------------------------------------
1894 -- Build_Discriminant_Assignments --
1895 ------------------------------------
1897 procedure Build_Discriminant_Assignments (Statement_List : List_Id) is
1899 Is_Tagged : constant Boolean := Is_Tagged_Type (Rec_Type);
1902 if Has_Discriminants (Rec_Type)
1903 and then not Is_Unchecked_Union (Rec_Type)
1905 D := First_Discriminant (Rec_Type);
1907 while Present (D) loop
1908 -- Don't generate the assignment for discriminants in derived
1909 -- tagged types if the discriminant is a renaming of some
1910 -- ancestor discriminant. This initialization will be done
1911 -- when initializing the _parent field of the derived record.
1913 if Is_Tagged and then
1914 Present (Corresponding_Discriminant (D))
1920 Append_List_To (Statement_List,
1921 Build_Assignment (D,
1922 New_Reference_To (Discriminal (D), Loc)));
1925 Next_Discriminant (D);
1928 end Build_Discriminant_Assignments;
1930 --------------------------
1931 -- Build_Init_Call_Thru --
1932 --------------------------
1934 function Build_Init_Call_Thru (Parameters : List_Id) return List_Id is
1935 Parent_Proc : constant Entity_Id :=
1936 Base_Init_Proc (Etype (Rec_Type));
1938 Parent_Type : constant Entity_Id :=
1939 Etype (First_Formal (Parent_Proc));
1941 Uparent_Type : constant Entity_Id :=
1942 Underlying_Type (Parent_Type);
1944 First_Discr_Param : Node_Id;
1946 Parent_Discr : Entity_Id;
1947 First_Arg : Node_Id;
1953 -- First argument (_Init) is the object to be initialized.
1954 -- ??? not sure where to get a reasonable Loc for First_Arg
1957 OK_Convert_To (Parent_Type,
1958 New_Reference_To (Defining_Identifier (First (Parameters)), Loc));
1960 Set_Etype (First_Arg, Parent_Type);
1962 Args := New_List (Convert_Concurrent (First_Arg, Rec_Type));
1964 -- In the tasks case,
1965 -- add _Master as the value of the _Master parameter
1966 -- add _Chain as the value of the _Chain parameter.
1967 -- add _Task_Name as the value of the _Task_Name parameter.
1968 -- At the outer level, these will be variables holding the
1969 -- corresponding values obtained from GNARL or the expander.
1971 -- At inner levels, they will be the parameters passed down through
1972 -- the outer routines.
1974 First_Discr_Param := Next (First (Parameters));
1976 if Has_Task (Rec_Type) then
1977 if Restriction_Active (No_Task_Hierarchy) then
1979 -- See comments in System.Tasking.Initialization.Init_RTS
1982 Append_To (Args, Make_Integer_Literal (Loc, 3));
1984 Append_To (Args, Make_Identifier (Loc, Name_uMaster));
1987 Append_To (Args, Make_Identifier (Loc, Name_uChain));
1988 Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
1989 First_Discr_Param := Next (Next (Next (First_Discr_Param)));
1992 -- Append discriminant values
1994 if Has_Discriminants (Uparent_Type) then
1995 pragma Assert (not Is_Tagged_Type (Uparent_Type));
1997 Parent_Discr := First_Discriminant (Uparent_Type);
1998 while Present (Parent_Discr) loop
2000 -- Get the initial value for this discriminant
2001 -- ??? needs to be cleaned up to use parent_Discr_Constr
2005 Discr_Value : Elmt_Id :=
2007 (Stored_Constraint (Rec_Type));
2009 Discr : Entity_Id :=
2010 First_Stored_Discriminant (Uparent_Type);
2012 while Original_Record_Component (Parent_Discr) /= Discr loop
2013 Next_Stored_Discriminant (Discr);
2014 Next_Elmt (Discr_Value);
2017 Arg := Node (Discr_Value);
2020 -- Append it to the list
2022 if Nkind (Arg) = N_Identifier
2023 and then Ekind (Entity (Arg)) = E_Discriminant
2026 New_Reference_To (Discriminal (Entity (Arg)), Loc));
2028 -- Case of access discriminants. We replace the reference
2029 -- to the type by a reference to the actual object.
2031 -- Is above comment right??? Use of New_Copy below seems mighty
2035 Append_To (Args, New_Copy (Arg));
2038 Next_Discriminant (Parent_Discr);
2044 Make_Procedure_Call_Statement (Loc,
2045 Name => New_Occurrence_Of (Parent_Proc, Loc),
2046 Parameter_Associations => Args));
2049 end Build_Init_Call_Thru;
2051 -----------------------------------
2052 -- Build_Offset_To_Top_Functions --
2053 -----------------------------------
2055 procedure Build_Offset_To_Top_Functions is
2057 procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id);
2059 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2061 -- return O.Iface_Comp'Position;
2064 ----------------------------------
2065 -- Build_Offset_To_Top_Function --
2066 ----------------------------------
2068 procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id) is
2069 Body_Node : Node_Id;
2070 Func_Id : Entity_Id;
2071 Spec_Node : Node_Id;
2075 Make_Defining_Identifier (Loc,
2076 Chars => New_Internal_Name ('F'));
2078 Set_DT_Offset_To_Top_Func (Iface_Comp, Func_Id);
2081 -- function Fxx (O : in Rec_Typ) return Storage_Offset;
2083 Spec_Node := New_Node (N_Function_Specification, Loc);
2084 Set_Defining_Unit_Name (Spec_Node, Func_Id);
2085 Set_Parameter_Specifications (Spec_Node, New_List (
2086 Make_Parameter_Specification (Loc,
2087 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uO),
2089 Parameter_Type => New_Reference_To (Rec_Type, Loc))));
2090 Set_Result_Definition (Spec_Node,
2091 New_Reference_To (RTE (RE_Storage_Offset), Loc));
2094 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2096 -- return O.Iface_Comp'Position;
2099 Body_Node := New_Node (N_Subprogram_Body, Loc);
2100 Set_Specification (Body_Node, Spec_Node);
2101 Set_Declarations (Body_Node, New_List);
2102 Set_Handled_Statement_Sequence (Body_Node,
2103 Make_Handled_Sequence_Of_Statements (Loc,
2104 Statements => New_List (
2105 Make_Simple_Return_Statement (Loc,
2107 Make_Attribute_Reference (Loc,
2109 Make_Selected_Component (Loc,
2110 Prefix => Make_Identifier (Loc, Name_uO),
2111 Selector_Name => New_Reference_To
2113 Attribute_Name => Name_Position)))));
2115 Set_Ekind (Func_Id, E_Function);
2116 Set_Mechanism (Func_Id, Default_Mechanism);
2117 Set_Is_Internal (Func_Id, True);
2119 if not Debug_Generated_Code then
2120 Set_Debug_Info_Off (Func_Id);
2123 Analyze (Body_Node);
2125 Append_Freeze_Action (Rec_Type, Body_Node);
2126 end Build_Offset_To_Top_Function;
2130 Ifaces_Comp_List : Elist_Id;
2131 Iface_Comp_Elmt : Elmt_Id;
2132 Iface_Comp : Node_Id;
2134 -- Start of processing for Build_Offset_To_Top_Functions
2137 -- Offset_To_Top_Functions are built only for derivations of types
2138 -- with discriminants that cover interface types.
2139 -- Nothing is needed either in case of virtual machines, since
2140 -- interfaces are handled directly by the VM.
2142 if not Is_Tagged_Type (Rec_Type)
2143 or else Etype (Rec_Type) = Rec_Type
2144 or else not Has_Discriminants (Etype (Rec_Type))
2145 or else VM_Target /= No_VM
2150 Collect_Interface_Components (Rec_Type, Ifaces_Comp_List);
2152 -- For each interface type with secondary dispatch table we generate
2153 -- the Offset_To_Top_Functions (required to displace the pointer in
2154 -- interface conversions)
2156 Iface_Comp_Elmt := First_Elmt (Ifaces_Comp_List);
2157 while Present (Iface_Comp_Elmt) loop
2158 Iface_Comp := Node (Iface_Comp_Elmt);
2159 pragma Assert (Is_Interface (Related_Type (Iface_Comp)));
2161 -- If the interface is a parent of Rec_Type it shares the primary
2162 -- dispatch table and hence there is no need to build the function
2164 if not Is_Ancestor (Related_Type (Iface_Comp), Rec_Type) then
2165 Build_Offset_To_Top_Function (Iface_Comp);
2168 Next_Elmt (Iface_Comp_Elmt);
2170 end Build_Offset_To_Top_Functions;
2172 --------------------------
2173 -- Build_Init_Procedure --
2174 --------------------------
2176 procedure Build_Init_Procedure is
2177 Body_Node : Node_Id;
2178 Handled_Stmt_Node : Node_Id;
2179 Parameters : List_Id;
2180 Proc_Spec_Node : Node_Id;
2181 Body_Stmts : List_Id;
2182 Record_Extension_Node : Node_Id;
2183 Init_Tags_List : List_Id;
2186 Body_Stmts := New_List;
2187 Body_Node := New_Node (N_Subprogram_Body, Loc);
2188 Set_Ekind (Proc_Id, E_Procedure);
2190 Proc_Spec_Node := New_Node (N_Procedure_Specification, Loc);
2191 Set_Defining_Unit_Name (Proc_Spec_Node, Proc_Id);
2193 Parameters := Init_Formals (Rec_Type);
2194 Append_List_To (Parameters,
2195 Build_Discriminant_Formals (Rec_Type, True));
2197 -- For tagged types, we add a flag to indicate whether the routine
2198 -- is called to initialize a parent component in the init_proc of
2199 -- a type extension. If the flag is false, we do not set the tag
2200 -- because it has been set already in the extension.
2202 if Is_Tagged_Type (Rec_Type)
2203 and then not Is_CPP_Class (Rec_Type)
2206 Make_Defining_Identifier (Loc,
2207 Chars => New_Internal_Name ('P'));
2209 Append_To (Parameters,
2210 Make_Parameter_Specification (Loc,
2211 Defining_Identifier => Set_Tag,
2212 Parameter_Type => New_Occurrence_Of (Standard_Boolean, Loc),
2213 Expression => New_Occurrence_Of (Standard_True, Loc)));
2216 Set_Parameter_Specifications (Proc_Spec_Node, Parameters);
2217 Set_Specification (Body_Node, Proc_Spec_Node);
2218 Set_Declarations (Body_Node, New_List);
2220 if Parent_Subtype_Renaming_Discrims then
2222 -- N is a Derived_Type_Definition that renames the parameters
2223 -- of the ancestor type. We initialize it by expanding our
2224 -- discriminants and call the ancestor _init_proc with a
2225 -- type-converted object
2227 Append_List_To (Body_Stmts,
2228 Build_Init_Call_Thru (Parameters));
2230 elsif Nkind (Type_Definition (N)) = N_Record_Definition then
2231 Build_Discriminant_Assignments (Body_Stmts);
2233 if not Null_Present (Type_Definition (N)) then
2234 Append_List_To (Body_Stmts,
2235 Build_Init_Statements (
2236 Component_List (Type_Definition (N))));
2240 -- N is a Derived_Type_Definition with a possible non-empty
2241 -- extension. The initialization of a type extension consists
2242 -- in the initialization of the components in the extension.
2244 Build_Discriminant_Assignments (Body_Stmts);
2246 Record_Extension_Node :=
2247 Record_Extension_Part (Type_Definition (N));
2249 if not Null_Present (Record_Extension_Node) then
2251 Stmts : constant List_Id :=
2252 Build_Init_Statements (
2253 Component_List (Record_Extension_Node));
2256 -- The parent field must be initialized first because
2257 -- the offset of the new discriminants may depend on it
2259 Prepend_To (Body_Stmts, Remove_Head (Stmts));
2260 Append_List_To (Body_Stmts, Stmts);
2265 -- Add here the assignment to instantiate the Tag
2267 -- The assignment corresponds to the code:
2269 -- _Init._Tag := Typ'Tag;
2271 -- Suppress the tag assignment when VM_Target because VM tags are
2272 -- represented implicitly in objects. It is also suppressed in case
2273 -- of CPP_Class types because in this case the tag is initialized in
2276 if Is_Tagged_Type (Rec_Type)
2277 and then not Is_CPP_Class (Rec_Type)
2278 and then VM_Target = No_VM
2279 and then not No_Run_Time_Mode
2281 -- Initialize the primary tag
2283 Init_Tags_List := New_List (
2284 Make_Assignment_Statement (Loc,
2286 Make_Selected_Component (Loc,
2287 Prefix => Make_Identifier (Loc, Name_uInit),
2289 New_Reference_To (First_Tag_Component (Rec_Type), Loc)),
2293 (Node (First_Elmt (Access_Disp_Table (Rec_Type))), Loc)));
2295 -- Ada 2005 (AI-251): Initialize the secondary tags components
2296 -- located at fixed positions (tags whose position depends on
2297 -- variable size components are initialized later ---see below).
2299 if Ada_Version >= Ada_05
2300 and then not Is_Interface (Rec_Type)
2301 and then Has_Interfaces (Rec_Type)
2305 Target => Make_Identifier (Loc, Name_uInit),
2306 Stmts_List => Init_Tags_List,
2307 Fixed_Comps => True,
2308 Variable_Comps => False);
2311 -- The tag must be inserted before the assignments to other
2312 -- components, because the initial value of the component may
2313 -- depend on the tag (eg. through a dispatching operation on
2314 -- an access to the current type). The tag assignment is not done
2315 -- when initializing the parent component of a type extension,
2316 -- because in that case the tag is set in the extension.
2318 -- Extensions of imported C++ classes add a final complication,
2319 -- because we cannot inhibit tag setting in the constructor for
2320 -- the parent. In that case we insert the tag initialization
2321 -- after the calls to initialize the parent.
2323 if not Is_CPP_Class (Root_Type (Rec_Type)) then
2324 Prepend_To (Body_Stmts,
2325 Make_If_Statement (Loc,
2326 Condition => New_Occurrence_Of (Set_Tag, Loc),
2327 Then_Statements => Init_Tags_List));
2329 -- CPP_Class derivation: In this case the dispatch table of the
2330 -- parent was built in the C++ side and we copy the table of the
2331 -- parent to initialize the new dispatch table.
2338 -- We assume the first init_proc call is for the parent
2340 Nod := First (Body_Stmts);
2341 while Present (Next (Nod))
2342 and then (Nkind (Nod) /= N_Procedure_Call_Statement
2343 or else not Is_Init_Proc (Name (Nod)))
2349 -- ancestor_constructor (_init.parent);
2351 -- inherit_prim_ops (_init._tag, new_dt, num_prims);
2352 -- _init._tag := new_dt;
2355 Prepend_To (Init_Tags_List,
2356 Build_Inherit_Prims (Loc,
2359 Make_Selected_Component (Loc,
2361 Make_Identifier (Loc,
2362 Chars => Name_uInit),
2365 (First_Tag_Component (Rec_Type), Loc)),
2368 (Node (First_Elmt (Access_Disp_Table (Rec_Type))),
2372 (DT_Entry_Count (First_Tag_Component (Rec_Type)))));
2375 Make_If_Statement (Loc,
2376 Condition => New_Occurrence_Of (Set_Tag, Loc),
2377 Then_Statements => Init_Tags_List));
2379 -- We have inherited table of the parent from the CPP side.
2380 -- Now we fill the slots associated with Ada primitives.
2381 -- This needs more work to avoid its execution each time
2382 -- an object is initialized???
2389 E := First_Elmt (Primitive_Operations (Rec_Type));
2390 while Present (E) loop
2393 if not Is_Imported (Prim)
2394 and then Convention (Prim) = Convention_CPP
2395 and then not Present (Interface_Alias (Prim))
2397 Append_List_To (Init_Tags_List,
2398 Register_Primitive (Loc, Prim => Prim));
2407 -- Ada 2005 (AI-251): Initialize the secondary tag components
2408 -- located at variable positions. We delay the generation of this
2409 -- code until here because the value of the attribute 'Position
2410 -- applied to variable size components of the parent type that
2411 -- depend on discriminants is only safely read at runtime after
2412 -- the parent components have been initialized.
2414 if Ada_Version >= Ada_05
2415 and then not Is_Interface (Rec_Type)
2416 and then Has_Interfaces (Rec_Type)
2417 and then Has_Discriminants (Etype (Rec_Type))
2418 and then Is_Variable_Size_Record (Etype (Rec_Type))
2420 Init_Tags_List := New_List;
2424 Target => Make_Identifier (Loc, Name_uInit),
2425 Stmts_List => Init_Tags_List,
2426 Fixed_Comps => False,
2427 Variable_Comps => True);
2429 if Is_Non_Empty_List (Init_Tags_List) then
2430 Append_List_To (Body_Stmts, Init_Tags_List);
2435 Handled_Stmt_Node := New_Node (N_Handled_Sequence_Of_Statements, Loc);
2436 Set_Statements (Handled_Stmt_Node, Body_Stmts);
2437 Set_Exception_Handlers (Handled_Stmt_Node, No_List);
2438 Set_Handled_Statement_Sequence (Body_Node, Handled_Stmt_Node);
2440 if not Debug_Generated_Code then
2441 Set_Debug_Info_Off (Proc_Id);
2444 -- Associate Init_Proc with type, and determine if the procedure
2445 -- is null (happens because of the Initialize_Scalars pragma case,
2446 -- where we have to generate a null procedure in case it is called
2447 -- by a client with Initialize_Scalars set). Such procedures have
2448 -- to be generated, but do not have to be called, so we mark them
2449 -- as null to suppress the call.
2451 Set_Init_Proc (Rec_Type, Proc_Id);
2453 if List_Length (Body_Stmts) = 1
2454 and then Nkind (First (Body_Stmts)) = N_Null_Statement
2455 and then VM_Target /= CLI_Target
2457 -- Even though the init proc may be null at this time it might get
2458 -- some stuff added to it later by the CIL backend, so always keep
2459 -- it when VM_Target = CLI_Target.
2461 Set_Is_Null_Init_Proc (Proc_Id);
2463 end Build_Init_Procedure;
2465 ---------------------------
2466 -- Build_Init_Statements --
2467 ---------------------------
2469 function Build_Init_Statements (Comp_List : Node_Id) return List_Id is
2470 Check_List : constant List_Id := New_List;
2475 Statement_List : List_Id;
2480 Per_Object_Constraint_Components : Boolean;
2482 function Has_Access_Constraint (E : Entity_Id) return Boolean;
2483 -- Components with access discriminants that depend on the current
2484 -- instance must be initialized after all other components.
2486 ---------------------------
2487 -- Has_Access_Constraint --
2488 ---------------------------
2490 function Has_Access_Constraint (E : Entity_Id) return Boolean is
2492 T : constant Entity_Id := Etype (E);
2495 if Has_Per_Object_Constraint (E)
2496 and then Has_Discriminants (T)
2498 Disc := First_Discriminant (T);
2499 while Present (Disc) loop
2500 if Is_Access_Type (Etype (Disc)) then
2504 Next_Discriminant (Disc);
2511 end Has_Access_Constraint;
2513 -- Start of processing for Build_Init_Statements
2516 if Null_Present (Comp_List) then
2517 return New_List (Make_Null_Statement (Loc));
2520 Statement_List := New_List;
2522 -- Loop through visible declarations of task types and protected
2523 -- types moving any expanded code from the spec to the body of the
2526 if Is_Task_Record_Type (Rec_Type)
2527 or else Is_Protected_Record_Type (Rec_Type)
2530 Decl : constant Node_Id :=
2531 Parent (Corresponding_Concurrent_Type (Rec_Type));
2537 if Is_Task_Record_Type (Rec_Type) then
2538 Def := Task_Definition (Decl);
2540 Def := Protected_Definition (Decl);
2543 if Present (Def) then
2544 N1 := First (Visible_Declarations (Def));
2545 while Present (N1) loop
2549 if Nkind (N2) in N_Statement_Other_Than_Procedure_Call
2550 or else Nkind (N2) in N_Raise_xxx_Error
2551 or else Nkind (N2) = N_Procedure_Call_Statement
2553 Append_To (Statement_List,
2554 New_Copy_Tree (N2, New_Scope => Proc_Id));
2555 Rewrite (N2, Make_Null_Statement (Sloc (N2)));
2563 -- Loop through components, skipping pragmas, in 2 steps. The first
2564 -- step deals with regular components. The second step deals with
2565 -- components have per object constraints, and no explicit initia-
2568 Per_Object_Constraint_Components := False;
2570 -- First step : regular components
2572 Decl := First_Non_Pragma (Component_Items (Comp_List));
2573 while Present (Decl) loop
2576 (Subtype_Indication (Component_Definition (Decl)), Check_List);
2578 Id := Defining_Identifier (Decl);
2581 if Has_Access_Constraint (Id)
2582 and then No (Expression (Decl))
2584 -- Skip processing for now and ask for a second pass
2586 Per_Object_Constraint_Components := True;
2589 -- Case of explicit initialization
2591 if Present (Expression (Decl)) then
2592 Stmts := Build_Assignment (Id, Expression (Decl));
2594 -- Case of composite component with its own Init_Proc
2596 elsif not Is_Interface (Typ)
2597 and then Has_Non_Null_Base_Init_Proc (Typ)
2600 Build_Initialization_Call
2602 Make_Selected_Component (Loc,
2603 Prefix => Make_Identifier (Loc, Name_uInit),
2604 Selector_Name => New_Occurrence_Of (Id, Loc)),
2606 In_Init_Proc => True,
2607 Enclos_Type => Rec_Type,
2608 Discr_Map => Discr_Map);
2610 Clean_Task_Names (Typ, Proc_Id);
2612 -- Case of component needing simple initialization
2614 elsif Component_Needs_Simple_Initialization (Typ) then
2617 (Id, Get_Simple_Init_Val (Typ, N, Esize (Id)));
2619 -- Nothing needed for this case
2625 if Present (Check_List) then
2626 Append_List_To (Statement_List, Check_List);
2629 if Present (Stmts) then
2631 -- Add the initialization of the record controller before
2632 -- the _Parent field is attached to it when the attachment
2633 -- can occur. It does not work to simply initialize the
2634 -- controller first: it must be initialized after the parent
2635 -- if the parent holds discriminants that can be used to
2636 -- compute the offset of the controller. We assume here that
2637 -- the last statement of the initialization call is the
2638 -- attachment of the parent (see Build_Initialization_Call)
2640 if Chars (Id) = Name_uController
2641 and then Rec_Type /= Etype (Rec_Type)
2642 and then Has_Controlled_Component (Etype (Rec_Type))
2643 and then Has_New_Controlled_Component (Rec_Type)
2644 and then Present (Last (Statement_List))
2646 Insert_List_Before (Last (Statement_List), Stmts);
2648 Append_List_To (Statement_List, Stmts);
2653 Next_Non_Pragma (Decl);
2656 if Per_Object_Constraint_Components then
2658 -- Second pass: components with per-object constraints
2660 Decl := First_Non_Pragma (Component_Items (Comp_List));
2661 while Present (Decl) loop
2663 Id := Defining_Identifier (Decl);
2666 if Has_Access_Constraint (Id)
2667 and then No (Expression (Decl))
2669 if Has_Non_Null_Base_Init_Proc (Typ) then
2670 Append_List_To (Statement_List,
2671 Build_Initialization_Call (Loc,
2672 Make_Selected_Component (Loc,
2673 Prefix => Make_Identifier (Loc, Name_uInit),
2674 Selector_Name => New_Occurrence_Of (Id, Loc)),
2676 In_Init_Proc => True,
2677 Enclos_Type => Rec_Type,
2678 Discr_Map => Discr_Map));
2680 Clean_Task_Names (Typ, Proc_Id);
2682 elsif Component_Needs_Simple_Initialization (Typ) then
2683 Append_List_To (Statement_List,
2685 (Id, Get_Simple_Init_Val (Typ, N, Esize (Id))));
2689 Next_Non_Pragma (Decl);
2693 -- Process the variant part
2695 if Present (Variant_Part (Comp_List)) then
2696 Alt_List := New_List;
2697 Variant := First_Non_Pragma (Variants (Variant_Part (Comp_List)));
2698 while Present (Variant) loop
2699 Loc := Sloc (Variant);
2700 Append_To (Alt_List,
2701 Make_Case_Statement_Alternative (Loc,
2703 New_Copy_List (Discrete_Choices (Variant)),
2705 Build_Init_Statements (Component_List (Variant))));
2706 Next_Non_Pragma (Variant);
2709 -- The expression of the case statement which is a reference
2710 -- to one of the discriminants is replaced by the appropriate
2711 -- formal parameter of the initialization procedure.
2713 Append_To (Statement_List,
2714 Make_Case_Statement (Loc,
2716 New_Reference_To (Discriminal (
2717 Entity (Name (Variant_Part (Comp_List)))), Loc),
2718 Alternatives => Alt_List));
2721 -- For a task record type, add the task create call and calls
2722 -- to bind any interrupt (signal) entries.
2724 if Is_Task_Record_Type (Rec_Type) then
2726 -- In the case of the restricted run time the ATCB has already
2727 -- been preallocated.
2729 if Restricted_Profile then
2730 Append_To (Statement_List,
2731 Make_Assignment_Statement (Loc,
2732 Name => Make_Selected_Component (Loc,
2733 Prefix => Make_Identifier (Loc, Name_uInit),
2734 Selector_Name => Make_Identifier (Loc, Name_uTask_Id)),
2735 Expression => Make_Attribute_Reference (Loc,
2737 Make_Selected_Component (Loc,
2738 Prefix => Make_Identifier (Loc, Name_uInit),
2740 Make_Identifier (Loc, Name_uATCB)),
2741 Attribute_Name => Name_Unchecked_Access)));
2744 Append_To (Statement_List, Make_Task_Create_Call (Rec_Type));
2746 -- Generate the statements which map a string entry name to a
2747 -- task entry index. Note that the task may not have entries.
2749 if Entry_Names_OK then
2750 Names := Build_Entry_Names (Rec_Type);
2752 if Present (Names) then
2753 Append_To (Statement_List, Names);
2758 Task_Type : constant Entity_Id :=
2759 Corresponding_Concurrent_Type (Rec_Type);
2760 Task_Decl : constant Node_Id := Parent (Task_Type);
2761 Task_Def : constant Node_Id := Task_Definition (Task_Decl);
2766 if Present (Task_Def) then
2767 Vis_Decl := First (Visible_Declarations (Task_Def));
2768 while Present (Vis_Decl) loop
2769 Loc := Sloc (Vis_Decl);
2771 if Nkind (Vis_Decl) = N_Attribute_Definition_Clause then
2772 if Get_Attribute_Id (Chars (Vis_Decl)) =
2775 Ent := Entity (Name (Vis_Decl));
2777 if Ekind (Ent) = E_Entry then
2778 Append_To (Statement_List,
2779 Make_Procedure_Call_Statement (Loc,
2780 Name => New_Reference_To (
2781 RTE (RE_Bind_Interrupt_To_Entry), Loc),
2782 Parameter_Associations => New_List (
2783 Make_Selected_Component (Loc,
2785 Make_Identifier (Loc, Name_uInit),
2787 Make_Identifier (Loc, Name_uTask_Id)),
2788 Entry_Index_Expression (
2789 Loc, Ent, Empty, Task_Type),
2790 Expression (Vis_Decl))));
2801 -- For a protected type, add statements generated by
2802 -- Make_Initialize_Protection.
2804 if Is_Protected_Record_Type (Rec_Type) then
2805 Append_List_To (Statement_List,
2806 Make_Initialize_Protection (Rec_Type));
2808 -- Generate the statements which map a string entry name to a
2809 -- protected entry index. Note that the protected type may not
2812 if Entry_Names_OK then
2813 Names := Build_Entry_Names (Rec_Type);
2815 if Present (Names) then
2816 Append_To (Statement_List, Names);
2821 -- If no initializations when generated for component declarations
2822 -- corresponding to this Statement_List, append a null statement
2823 -- to the Statement_List to make it a valid Ada tree.
2825 if Is_Empty_List (Statement_List) then
2826 Append (New_Node (N_Null_Statement, Loc), Statement_List);
2829 return Statement_List;
2832 when RE_Not_Available =>
2834 end Build_Init_Statements;
2836 -------------------------
2837 -- Build_Record_Checks --
2838 -------------------------
2840 procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id) is
2841 Subtype_Mark_Id : Entity_Id;
2844 if Nkind (S) = N_Subtype_Indication then
2845 Find_Type (Subtype_Mark (S));
2846 Subtype_Mark_Id := Entity (Subtype_Mark (S));
2848 -- Remaining processing depends on type
2850 case Ekind (Subtype_Mark_Id) is
2853 Constrain_Array (S, Check_List);
2859 end Build_Record_Checks;
2861 -------------------------------------------
2862 -- Component_Needs_Simple_Initialization --
2863 -------------------------------------------
2865 function Component_Needs_Simple_Initialization
2866 (T : Entity_Id) return Boolean
2870 Needs_Simple_Initialization (T)
2871 and then not Is_RTE (T, RE_Tag)
2873 -- Ada 2005 (AI-251): Check also the tag of abstract interfaces
2875 and then not Is_RTE (T, RE_Interface_Tag);
2876 end Component_Needs_Simple_Initialization;
2878 ---------------------
2879 -- Constrain_Array --
2880 ---------------------
2882 procedure Constrain_Array
2884 Check_List : List_Id)
2886 C : constant Node_Id := Constraint (SI);
2887 Number_Of_Constraints : Nat := 0;
2892 T := Entity (Subtype_Mark (SI));
2894 if Ekind (T) in Access_Kind then
2895 T := Designated_Type (T);
2898 S := First (Constraints (C));
2900 while Present (S) loop
2901 Number_Of_Constraints := Number_Of_Constraints + 1;
2905 -- In either case, the index constraint must provide a discrete
2906 -- range for each index of the array type and the type of each
2907 -- discrete range must be the same as that of the corresponding
2908 -- index. (RM 3.6.1)
2910 S := First (Constraints (C));
2911 Index := First_Index (T);
2914 -- Apply constraints to each index type
2916 for J in 1 .. Number_Of_Constraints loop
2917 Constrain_Index (Index, S, Check_List);
2922 end Constrain_Array;
2924 ---------------------
2925 -- Constrain_Index --
2926 ---------------------
2928 procedure Constrain_Index
2931 Check_List : List_Id)
2933 T : constant Entity_Id := Etype (Index);
2936 if Nkind (S) = N_Range then
2937 Process_Range_Expr_In_Decl (S, T, Check_List);
2939 end Constrain_Index;
2941 --------------------------------------
2942 -- Parent_Subtype_Renaming_Discrims --
2943 --------------------------------------
2945 function Parent_Subtype_Renaming_Discrims return Boolean is
2950 if Base_Type (Pe) /= Pe then
2955 or else not Has_Discriminants (Pe)
2956 or else Is_Constrained (Pe)
2957 or else Is_Tagged_Type (Pe)
2962 -- If there are no explicit stored discriminants we have inherited
2963 -- the root type discriminants so far, so no renamings occurred.
2965 if First_Discriminant (Pe) = First_Stored_Discriminant (Pe) then
2969 -- Check if we have done some trivial renaming of the parent
2970 -- discriminants, i.e. something like
2972 -- type DT (X1,X2: int) is new PT (X1,X2);
2974 De := First_Discriminant (Pe);
2975 Dp := First_Discriminant (Etype (Pe));
2977 while Present (De) loop
2978 pragma Assert (Present (Dp));
2980 if Corresponding_Discriminant (De) /= Dp then
2984 Next_Discriminant (De);
2985 Next_Discriminant (Dp);
2988 return Present (Dp);
2989 end Parent_Subtype_Renaming_Discrims;
2991 ------------------------
2992 -- Requires_Init_Proc --
2993 ------------------------
2995 function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean is
2996 Comp_Decl : Node_Id;
3001 -- Definitely do not need one if specifically suppressed
3003 if Suppress_Init_Proc (Rec_Id) then
3007 -- If it is a type derived from a type with unknown discriminants,
3008 -- we cannot build an initialization procedure for it.
3010 if Has_Unknown_Discriminants (Rec_Id)
3011 or else Has_Unknown_Discriminants (Etype (Rec_Id))
3016 -- Otherwise we need to generate an initialization procedure if
3017 -- Is_CPP_Class is False and at least one of the following applies:
3019 -- 1. Discriminants are present, since they need to be initialized
3020 -- with the appropriate discriminant constraint expressions.
3021 -- However, the discriminant of an unchecked union does not
3022 -- count, since the discriminant is not present.
3024 -- 2. The type is a tagged type, since the implicit Tag component
3025 -- needs to be initialized with a pointer to the dispatch table.
3027 -- 3. The type contains tasks
3029 -- 4. One or more components has an initial value
3031 -- 5. One or more components is for a type which itself requires
3032 -- an initialization procedure.
3034 -- 6. One or more components is a type that requires simple
3035 -- initialization (see Needs_Simple_Initialization), except
3036 -- that types Tag and Interface_Tag are excluded, since fields
3037 -- of these types are initialized by other means.
3039 -- 7. The type is the record type built for a task type (since at
3040 -- the very least, Create_Task must be called)
3042 -- 8. The type is the record type built for a protected type (since
3043 -- at least Initialize_Protection must be called)
3045 -- 9. The type is marked as a public entity. The reason we add this
3046 -- case (even if none of the above apply) is to properly handle
3047 -- Initialize_Scalars. If a package is compiled without an IS
3048 -- pragma, and the client is compiled with an IS pragma, then
3049 -- the client will think an initialization procedure is present
3050 -- and call it, when in fact no such procedure is required, but
3051 -- since the call is generated, there had better be a routine
3052 -- at the other end of the call, even if it does nothing!)
3054 -- Note: the reason we exclude the CPP_Class case is because in this
3055 -- case the initialization is performed in the C++ side.
3057 if Is_CPP_Class (Rec_Id) then
3060 elsif Is_Interface (Rec_Id) then
3063 elsif (Has_Discriminants (Rec_Id)
3064 and then not Is_Unchecked_Union (Rec_Id))
3065 or else Is_Tagged_Type (Rec_Id)
3066 or else Is_Concurrent_Record_Type (Rec_Id)
3067 or else Has_Task (Rec_Id)
3072 Id := First_Component (Rec_Id);
3073 while Present (Id) loop
3074 Comp_Decl := Parent (Id);
3077 if Present (Expression (Comp_Decl))
3078 or else Has_Non_Null_Base_Init_Proc (Typ)
3079 or else Component_Needs_Simple_Initialization (Typ)
3084 Next_Component (Id);
3087 -- As explained above, a record initialization procedure is needed
3088 -- for public types in case Initialize_Scalars applies to a client.
3089 -- However, such a procedure is not needed in the case where either
3090 -- of restrictions No_Initialize_Scalars or No_Default_Initialization
3091 -- applies. No_Initialize_Scalars excludes the possibility of using
3092 -- Initialize_Scalars in any partition, and No_Default_Initialization
3093 -- implies that no initialization should ever be done for objects of
3094 -- the type, so is incompatible with Initialize_Scalars.
3096 if not Restriction_Active (No_Initialize_Scalars)
3097 and then not Restriction_Active (No_Default_Initialization)
3098 and then Is_Public (Rec_Id)
3104 end Requires_Init_Proc;
3106 -- Start of processing for Build_Record_Init_Proc
3109 -- Check for value type, which means no initialization required
3111 Rec_Type := Defining_Identifier (N);
3113 if Is_Value_Type (Rec_Type) then
3117 -- This may be full declaration of a private type, in which case
3118 -- the visible entity is a record, and the private entity has been
3119 -- exchanged with it in the private part of the current package.
3120 -- The initialization procedure is built for the record type, which
3121 -- is retrievable from the private entity.
3123 if Is_Incomplete_Or_Private_Type (Rec_Type) then
3124 Rec_Type := Underlying_Type (Rec_Type);
3127 -- If there are discriminants, build the discriminant map to replace
3128 -- discriminants by their discriminals in complex bound expressions.
3129 -- These only arise for the corresponding records of synchronized types.
3131 if Is_Concurrent_Record_Type (Rec_Type)
3132 and then Has_Discriminants (Rec_Type)
3137 Disc := First_Discriminant (Rec_Type);
3138 while Present (Disc) loop
3139 Append_Elmt (Disc, Discr_Map);
3140 Append_Elmt (Discriminal (Disc), Discr_Map);
3141 Next_Discriminant (Disc);
3146 -- Derived types that have no type extension can use the initialization
3147 -- procedure of their parent and do not need a procedure of their own.
3148 -- This is only correct if there are no representation clauses for the
3149 -- type or its parent, and if the parent has in fact been frozen so
3150 -- that its initialization procedure exists.
3152 if Is_Derived_Type (Rec_Type)
3153 and then not Is_Tagged_Type (Rec_Type)
3154 and then not Is_Unchecked_Union (Rec_Type)
3155 and then not Has_New_Non_Standard_Rep (Rec_Type)
3156 and then not Parent_Subtype_Renaming_Discrims
3157 and then Has_Non_Null_Base_Init_Proc (Etype (Rec_Type))
3159 Copy_TSS (Base_Init_Proc (Etype (Rec_Type)), Rec_Type);
3161 -- Otherwise if we need an initialization procedure, then build one,
3162 -- mark it as public and inlinable and as having a completion.
3164 elsif Requires_Init_Proc (Rec_Type)
3165 or else Is_Unchecked_Union (Rec_Type)
3168 Make_Defining_Identifier (Loc,
3169 Chars => Make_Init_Proc_Name (Rec_Type));
3171 -- If No_Default_Initialization restriction is active, then we don't
3172 -- want to build an init_proc, but we need to mark that an init_proc
3173 -- would be needed if this restriction was not active (so that we can
3174 -- detect attempts to call it), so set a dummy init_proc in place.
3176 if Restriction_Active (No_Default_Initialization) then
3177 Set_Init_Proc (Rec_Type, Proc_Id);
3181 Build_Offset_To_Top_Functions;
3182 Build_Init_Procedure;
3183 Set_Is_Public (Proc_Id, Is_Public (Pe));
3185 -- The initialization of protected records is not worth inlining.
3186 -- In addition, when compiled for another unit for inlining purposes,
3187 -- it may make reference to entities that have not been elaborated
3188 -- yet. The initialization of controlled records contains a nested
3189 -- clean-up procedure that makes it impractical to inline as well,
3190 -- and leads to undefined symbols if inlined in a different unit.
3191 -- Similar considerations apply to task types.
3193 if not Is_Concurrent_Type (Rec_Type)
3194 and then not Has_Task (Rec_Type)
3195 and then not Needs_Finalization (Rec_Type)
3197 Set_Is_Inlined (Proc_Id);
3200 Set_Is_Internal (Proc_Id);
3201 Set_Has_Completion (Proc_Id);
3203 if not Debug_Generated_Code then
3204 Set_Debug_Info_Off (Proc_Id);
3208 Agg : constant Node_Id :=
3209 Build_Equivalent_Record_Aggregate (Rec_Type);
3211 procedure Collect_Itypes (Comp : Node_Id);
3212 -- Generate references to itypes in the aggregate, because
3213 -- the first use of the aggregate may be in a nested scope.
3215 --------------------
3216 -- Collect_Itypes --
3217 --------------------
3219 procedure Collect_Itypes (Comp : Node_Id) is
3222 Typ : constant Entity_Id := Etype (Comp);
3225 if Is_Array_Type (Typ)
3226 and then Is_Itype (Typ)
3228 Ref := Make_Itype_Reference (Loc);
3229 Set_Itype (Ref, Typ);
3230 Append_Freeze_Action (Rec_Type, Ref);
3232 Ref := Make_Itype_Reference (Loc);
3233 Set_Itype (Ref, Etype (First_Index (Typ)));
3234 Append_Freeze_Action (Rec_Type, Ref);
3236 Sub_Aggr := First (Expressions (Comp));
3238 -- Recurse on nested arrays
3240 while Present (Sub_Aggr) loop
3241 Collect_Itypes (Sub_Aggr);
3248 -- If there is a static initialization aggregate for the type,
3249 -- generate itype references for the types of its (sub)components,
3250 -- to prevent out-of-scope errors in the resulting tree.
3251 -- The aggregate may have been rewritten as a Raise node, in which
3252 -- case there are no relevant itypes.
3255 and then Nkind (Agg) = N_Aggregate
3257 Set_Static_Initialization (Proc_Id, Agg);
3262 Comp := First (Component_Associations (Agg));
3263 while Present (Comp) loop
3264 Collect_Itypes (Expression (Comp));
3271 end Build_Record_Init_Proc;
3273 ----------------------------
3274 -- Build_Slice_Assignment --
3275 ----------------------------
3277 -- Generates the following subprogram:
3280 -- (Source, Target : Array_Type,
3281 -- Left_Lo, Left_Hi : Index;
3282 -- Right_Lo, Right_Hi : Index;
3290 -- if Left_Hi < Left_Lo then
3303 -- Target (Li1) := Source (Ri1);
3306 -- exit when Li1 = Left_Lo;
3307 -- Li1 := Index'pred (Li1);
3308 -- Ri1 := Index'pred (Ri1);
3310 -- exit when Li1 = Left_Hi;
3311 -- Li1 := Index'succ (Li1);
3312 -- Ri1 := Index'succ (Ri1);
3317 procedure Build_Slice_Assignment (Typ : Entity_Id) is
3318 Loc : constant Source_Ptr := Sloc (Typ);
3319 Index : constant Entity_Id := Base_Type (Etype (First_Index (Typ)));
3321 -- Build formal parameters of procedure
3323 Larray : constant Entity_Id :=
3324 Make_Defining_Identifier
3325 (Loc, Chars => New_Internal_Name ('A'));
3326 Rarray : constant Entity_Id :=
3327 Make_Defining_Identifier
3328 (Loc, Chars => New_Internal_Name ('R'));
3329 Left_Lo : constant Entity_Id :=
3330 Make_Defining_Identifier
3331 (Loc, Chars => New_Internal_Name ('L'));
3332 Left_Hi : constant Entity_Id :=
3333 Make_Defining_Identifier
3334 (Loc, Chars => New_Internal_Name ('L'));
3335 Right_Lo : constant Entity_Id :=
3336 Make_Defining_Identifier
3337 (Loc, Chars => New_Internal_Name ('R'));
3338 Right_Hi : constant Entity_Id :=
3339 Make_Defining_Identifier
3340 (Loc, Chars => New_Internal_Name ('R'));
3341 Rev : constant Entity_Id :=
3342 Make_Defining_Identifier
3343 (Loc, Chars => New_Internal_Name ('D'));
3344 Proc_Name : constant Entity_Id :=
3345 Make_Defining_Identifier (Loc,
3346 Chars => Make_TSS_Name (Typ, TSS_Slice_Assign));
3348 Lnn : constant Entity_Id :=
3349 Make_Defining_Identifier (Loc, New_Internal_Name ('L'));
3350 Rnn : constant Entity_Id :=
3351 Make_Defining_Identifier (Loc, New_Internal_Name ('R'));
3352 -- Subscripts for left and right sides
3359 -- Build declarations for indices
3364 Make_Object_Declaration (Loc,
3365 Defining_Identifier => Lnn,
3366 Object_Definition =>
3367 New_Occurrence_Of (Index, Loc)));
3370 Make_Object_Declaration (Loc,
3371 Defining_Identifier => Rnn,
3372 Object_Definition =>
3373 New_Occurrence_Of (Index, Loc)));
3377 -- Build test for empty slice case
3380 Make_If_Statement (Loc,
3383 Left_Opnd => New_Occurrence_Of (Left_Hi, Loc),
3384 Right_Opnd => New_Occurrence_Of (Left_Lo, Loc)),
3385 Then_Statements => New_List (Make_Simple_Return_Statement (Loc))));
3387 -- Build initializations for indices
3390 F_Init : constant List_Id := New_List;
3391 B_Init : constant List_Id := New_List;
3395 Make_Assignment_Statement (Loc,
3396 Name => New_Occurrence_Of (Lnn, Loc),
3397 Expression => New_Occurrence_Of (Left_Lo, Loc)));
3400 Make_Assignment_Statement (Loc,
3401 Name => New_Occurrence_Of (Rnn, Loc),
3402 Expression => New_Occurrence_Of (Right_Lo, Loc)));
3405 Make_Assignment_Statement (Loc,
3406 Name => New_Occurrence_Of (Lnn, Loc),
3407 Expression => New_Occurrence_Of (Left_Hi, Loc)));
3410 Make_Assignment_Statement (Loc,
3411 Name => New_Occurrence_Of (Rnn, Loc),
3412 Expression => New_Occurrence_Of (Right_Hi, Loc)));
3415 Make_If_Statement (Loc,
3416 Condition => New_Occurrence_Of (Rev, Loc),
3417 Then_Statements => B_Init,
3418 Else_Statements => F_Init));
3421 -- Now construct the assignment statement
3424 Make_Loop_Statement (Loc,
3425 Statements => New_List (
3426 Make_Assignment_Statement (Loc,
3428 Make_Indexed_Component (Loc,
3429 Prefix => New_Occurrence_Of (Larray, Loc),
3430 Expressions => New_List (New_Occurrence_Of (Lnn, Loc))),
3432 Make_Indexed_Component (Loc,
3433 Prefix => New_Occurrence_Of (Rarray, Loc),
3434 Expressions => New_List (New_Occurrence_Of (Rnn, Loc))))),
3435 End_Label => Empty);
3437 -- Build the exit condition and increment/decrement statements
3440 F_Ass : constant List_Id := New_List;
3441 B_Ass : constant List_Id := New_List;
3445 Make_Exit_Statement (Loc,
3448 Left_Opnd => New_Occurrence_Of (Lnn, Loc),
3449 Right_Opnd => New_Occurrence_Of (Left_Hi, Loc))));
3452 Make_Assignment_Statement (Loc,
3453 Name => New_Occurrence_Of (Lnn, Loc),
3455 Make_Attribute_Reference (Loc,
3457 New_Occurrence_Of (Index, Loc),
3458 Attribute_Name => Name_Succ,
3459 Expressions => New_List (
3460 New_Occurrence_Of (Lnn, Loc)))));
3463 Make_Assignment_Statement (Loc,
3464 Name => New_Occurrence_Of (Rnn, Loc),
3466 Make_Attribute_Reference (Loc,
3468 New_Occurrence_Of (Index, Loc),
3469 Attribute_Name => Name_Succ,
3470 Expressions => New_List (
3471 New_Occurrence_Of (Rnn, Loc)))));
3474 Make_Exit_Statement (Loc,
3477 Left_Opnd => New_Occurrence_Of (Lnn, Loc),
3478 Right_Opnd => New_Occurrence_Of (Left_Lo, Loc))));
3481 Make_Assignment_Statement (Loc,
3482 Name => New_Occurrence_Of (Lnn, Loc),
3484 Make_Attribute_Reference (Loc,
3486 New_Occurrence_Of (Index, Loc),
3487 Attribute_Name => Name_Pred,
3488 Expressions => New_List (
3489 New_Occurrence_Of (Lnn, Loc)))));
3492 Make_Assignment_Statement (Loc,
3493 Name => New_Occurrence_Of (Rnn, Loc),
3495 Make_Attribute_Reference (Loc,
3497 New_Occurrence_Of (Index, Loc),
3498 Attribute_Name => Name_Pred,
3499 Expressions => New_List (
3500 New_Occurrence_Of (Rnn, Loc)))));
3502 Append_To (Statements (Loops),
3503 Make_If_Statement (Loc,
3504 Condition => New_Occurrence_Of (Rev, Loc),
3505 Then_Statements => B_Ass,
3506 Else_Statements => F_Ass));
3509 Append_To (Stats, Loops);
3513 Formals : List_Id := New_List;
3516 Formals := New_List (
3517 Make_Parameter_Specification (Loc,
3518 Defining_Identifier => Larray,
3519 Out_Present => True,
3521 New_Reference_To (Base_Type (Typ), Loc)),
3523 Make_Parameter_Specification (Loc,
3524 Defining_Identifier => Rarray,
3526 New_Reference_To (Base_Type (Typ), Loc)),
3528 Make_Parameter_Specification (Loc,
3529 Defining_Identifier => Left_Lo,
3531 New_Reference_To (Index, Loc)),
3533 Make_Parameter_Specification (Loc,
3534 Defining_Identifier => Left_Hi,
3536 New_Reference_To (Index, Loc)),
3538 Make_Parameter_Specification (Loc,
3539 Defining_Identifier => Right_Lo,
3541 New_Reference_To (Index, Loc)),
3543 Make_Parameter_Specification (Loc,
3544 Defining_Identifier => Right_Hi,
3546 New_Reference_To (Index, Loc)));
3549 Make_Parameter_Specification (Loc,
3550 Defining_Identifier => Rev,
3552 New_Reference_To (Standard_Boolean, Loc)));
3555 Make_Procedure_Specification (Loc,
3556 Defining_Unit_Name => Proc_Name,
3557 Parameter_Specifications => Formals);
3560 Make_Subprogram_Body (Loc,
3561 Specification => Spec,
3562 Declarations => Decls,
3563 Handled_Statement_Sequence =>
3564 Make_Handled_Sequence_Of_Statements (Loc,
3565 Statements => Stats)));
3568 Set_TSS (Typ, Proc_Name);
3569 Set_Is_Pure (Proc_Name);
3570 end Build_Slice_Assignment;
3572 ------------------------------------
3573 -- Build_Variant_Record_Equality --
3574 ------------------------------------
3578 -- function _Equality (X, Y : T) return Boolean is
3580 -- -- Compare discriminants
3582 -- if False or else X.D1 /= Y.D1 or else X.D2 /= Y.D2 then
3586 -- -- Compare components
3588 -- if False or else X.C1 /= Y.C1 or else X.C2 /= Y.C2 then
3592 -- -- Compare variant part
3596 -- if False or else X.C2 /= Y.C2 or else X.C3 /= Y.C3 then
3601 -- if False or else X.Cn /= Y.Cn then
3609 procedure Build_Variant_Record_Equality (Typ : Entity_Id) is
3610 Loc : constant Source_Ptr := Sloc (Typ);
3612 F : constant Entity_Id :=
3613 Make_Defining_Identifier (Loc,
3614 Chars => Make_TSS_Name (Typ, TSS_Composite_Equality));
3616 X : constant Entity_Id :=
3617 Make_Defining_Identifier (Loc,
3620 Y : constant Entity_Id :=
3621 Make_Defining_Identifier (Loc,
3624 Def : constant Node_Id := Parent (Typ);
3625 Comps : constant Node_Id := Component_List (Type_Definition (Def));
3626 Stmts : constant List_Id := New_List;
3627 Pspecs : constant List_Id := New_List;
3630 -- Derived Unchecked_Union types no longer inherit the equality function
3633 if Is_Derived_Type (Typ)
3634 and then not Is_Unchecked_Union (Typ)
3635 and then not Has_New_Non_Standard_Rep (Typ)
3638 Parent_Eq : constant Entity_Id :=
3639 TSS (Root_Type (Typ), TSS_Composite_Equality);
3642 if Present (Parent_Eq) then
3643 Copy_TSS (Parent_Eq, Typ);
3650 Make_Subprogram_Body (Loc,
3652 Make_Function_Specification (Loc,
3653 Defining_Unit_Name => F,
3654 Parameter_Specifications => Pspecs,
3655 Result_Definition => New_Reference_To (Standard_Boolean, Loc)),
3656 Declarations => New_List,
3657 Handled_Statement_Sequence =>
3658 Make_Handled_Sequence_Of_Statements (Loc,
3659 Statements => Stmts)));
3662 Make_Parameter_Specification (Loc,
3663 Defining_Identifier => X,
3664 Parameter_Type => New_Reference_To (Typ, Loc)));
3667 Make_Parameter_Specification (Loc,
3668 Defining_Identifier => Y,
3669 Parameter_Type => New_Reference_To (Typ, Loc)));
3671 -- Unchecked_Unions require additional machinery to support equality.
3672 -- Two extra parameters (A and B) are added to the equality function
3673 -- parameter list in order to capture the inferred values of the
3674 -- discriminants in later calls.
3676 if Is_Unchecked_Union (Typ) then
3678 Discr_Type : constant Node_Id := Etype (First_Discriminant (Typ));
3680 A : constant Node_Id :=
3681 Make_Defining_Identifier (Loc,
3684 B : constant Node_Id :=
3685 Make_Defining_Identifier (Loc,
3689 -- Add A and B to the parameter list
3692 Make_Parameter_Specification (Loc,
3693 Defining_Identifier => A,
3694 Parameter_Type => New_Reference_To (Discr_Type, Loc)));
3697 Make_Parameter_Specification (Loc,
3698 Defining_Identifier => B,
3699 Parameter_Type => New_Reference_To (Discr_Type, Loc)));
3701 -- Generate the following header code to compare the inferred
3709 Make_If_Statement (Loc,
3712 Left_Opnd => New_Reference_To (A, Loc),
3713 Right_Opnd => New_Reference_To (B, Loc)),
3714 Then_Statements => New_List (
3715 Make_Simple_Return_Statement (Loc,
3716 Expression => New_Occurrence_Of (Standard_False, Loc)))));
3718 -- Generate component-by-component comparison. Note that we must
3719 -- propagate one of the inferred discriminant formals to act as
3720 -- the case statement switch.
3722 Append_List_To (Stmts,
3723 Make_Eq_Case (Typ, Comps, A));
3727 -- Normal case (not unchecked union)
3732 Discriminant_Specifications (Def)));
3734 Append_List_To (Stmts,
3735 Make_Eq_Case (Typ, Comps));
3739 Make_Simple_Return_Statement (Loc,
3740 Expression => New_Reference_To (Standard_True, Loc)));
3745 if not Debug_Generated_Code then
3746 Set_Debug_Info_Off (F);
3748 end Build_Variant_Record_Equality;
3750 -----------------------------
3751 -- Check_Stream_Attributes --
3752 -----------------------------
3754 procedure Check_Stream_Attributes (Typ : Entity_Id) is
3756 Par_Read : constant Boolean :=
3757 Stream_Attribute_Available (Typ, TSS_Stream_Read)
3758 and then not Has_Specified_Stream_Read (Typ);
3759 Par_Write : constant Boolean :=
3760 Stream_Attribute_Available (Typ, TSS_Stream_Write)
3761 and then not Has_Specified_Stream_Write (Typ);
3763 procedure Check_Attr (Nam : Name_Id; TSS_Nam : TSS_Name_Type);
3764 -- Check that Comp has a user-specified Nam stream attribute
3770 procedure Check_Attr (Nam : Name_Id; TSS_Nam : TSS_Name_Type) is
3772 if not Stream_Attribute_Available (Etype (Comp), TSS_Nam) then
3773 Error_Msg_Name_1 := Nam;
3775 ("|component& in limited extension must have% attribute", Comp);
3779 -- Start of processing for Check_Stream_Attributes
3782 if Par_Read or else Par_Write then
3783 Comp := First_Component (Typ);
3784 while Present (Comp) loop
3785 if Comes_From_Source (Comp)
3786 and then Original_Record_Component (Comp) = Comp
3787 and then Is_Limited_Type (Etype (Comp))
3790 Check_Attr (Name_Read, TSS_Stream_Read);
3794 Check_Attr (Name_Write, TSS_Stream_Write);
3798 Next_Component (Comp);
3801 end Check_Stream_Attributes;
3803 -----------------------------
3804 -- Expand_Record_Extension --
3805 -----------------------------
3807 -- Add a field _parent at the beginning of the record extension. This is
3808 -- used to implement inheritance. Here are some examples of expansion:
3810 -- 1. no discriminants
3811 -- type T2 is new T1 with null record;
3813 -- type T2 is new T1 with record
3817 -- 2. renamed discriminants
3818 -- type T2 (B, C : Int) is new T1 (A => B) with record
3819 -- _Parent : T1 (A => B);
3823 -- 3. inherited discriminants
3824 -- type T2 is new T1 with record -- discriminant A inherited
3825 -- _Parent : T1 (A);
3829 procedure Expand_Record_Extension (T : Entity_Id; Def : Node_Id) is
3830 Indic : constant Node_Id := Subtype_Indication (Def);
3831 Loc : constant Source_Ptr := Sloc (Def);
3832 Rec_Ext_Part : Node_Id := Record_Extension_Part (Def);
3833 Par_Subtype : Entity_Id;
3834 Comp_List : Node_Id;
3835 Comp_Decl : Node_Id;
3838 List_Constr : constant List_Id := New_List;
3841 -- Expand_Record_Extension is called directly from the semantics, so
3842 -- we must check to see whether expansion is active before proceeding
3844 if not Expander_Active then
3848 -- This may be a derivation of an untagged private type whose full
3849 -- view is tagged, in which case the Derived_Type_Definition has no
3850 -- extension part. Build an empty one now.
3852 if No (Rec_Ext_Part) then
3854 Make_Record_Definition (Loc,
3856 Component_List => Empty,
3857 Null_Present => True);
3859 Set_Record_Extension_Part (Def, Rec_Ext_Part);
3860 Mark_Rewrite_Insertion (Rec_Ext_Part);
3863 Comp_List := Component_List (Rec_Ext_Part);
3865 Parent_N := Make_Defining_Identifier (Loc, Name_uParent);
3867 -- If the derived type inherits its discriminants the type of the
3868 -- _parent field must be constrained by the inherited discriminants
3870 if Has_Discriminants (T)
3871 and then Nkind (Indic) /= N_Subtype_Indication
3872 and then not Is_Constrained (Entity (Indic))
3874 D := First_Discriminant (T);
3875 while Present (D) loop
3876 Append_To (List_Constr, New_Occurrence_Of (D, Loc));
3877 Next_Discriminant (D);
3882 Make_Subtype_Indication (Loc,
3883 Subtype_Mark => New_Reference_To (Entity (Indic), Loc),
3885 Make_Index_Or_Discriminant_Constraint (Loc,
3886 Constraints => List_Constr)),
3889 -- Otherwise the original subtype_indication is just what is needed
3892 Par_Subtype := Process_Subtype (New_Copy_Tree (Indic), Def);
3895 Set_Parent_Subtype (T, Par_Subtype);
3898 Make_Component_Declaration (Loc,
3899 Defining_Identifier => Parent_N,
3900 Component_Definition =>
3901 Make_Component_Definition (Loc,
3902 Aliased_Present => False,
3903 Subtype_Indication => New_Reference_To (Par_Subtype, Loc)));
3905 if Null_Present (Rec_Ext_Part) then
3906 Set_Component_List (Rec_Ext_Part,
3907 Make_Component_List (Loc,
3908 Component_Items => New_List (Comp_Decl),
3909 Variant_Part => Empty,
3910 Null_Present => False));
3911 Set_Null_Present (Rec_Ext_Part, False);
3913 elsif Null_Present (Comp_List)
3914 or else Is_Empty_List (Component_Items (Comp_List))
3916 Set_Component_Items (Comp_List, New_List (Comp_Decl));
3917 Set_Null_Present (Comp_List, False);
3920 Insert_Before (First (Component_Items (Comp_List)), Comp_Decl);
3923 Analyze (Comp_Decl);
3924 end Expand_Record_Extension;
3926 ------------------------------------
3927 -- Expand_N_Full_Type_Declaration --
3928 ------------------------------------
3930 procedure Expand_N_Full_Type_Declaration (N : Node_Id) is
3931 Def_Id : constant Entity_Id := Defining_Identifier (N);
3932 B_Id : constant Entity_Id := Base_Type (Def_Id);
3936 procedure Build_Master (Def_Id : Entity_Id);
3937 -- Create the master associated with Def_Id
3943 procedure Build_Master (Def_Id : Entity_Id) is
3945 -- Anonymous access types are created for the components of the
3946 -- record parameter for an entry declaration. No master is created
3949 if Has_Task (Designated_Type (Def_Id))
3950 and then Comes_From_Source (N)
3952 Build_Master_Entity (Def_Id);
3953 Build_Master_Renaming (Parent (Def_Id), Def_Id);
3955 -- Create a class-wide master because a Master_Id must be generated
3956 -- for access-to-limited-class-wide types whose root may be extended
3957 -- with task components.
3959 -- Note: This code covers access-to-limited-interfaces because they
3960 -- can be used to reference tasks implementing them.
3962 elsif Is_Class_Wide_Type (Designated_Type (Def_Id))
3963 and then Is_Limited_Type (Designated_Type (Def_Id))
3964 and then Tasking_Allowed
3966 -- Do not create a class-wide master for types whose convention is
3967 -- Java since these types cannot embed Ada tasks anyway. Note that
3968 -- the following test cannot catch the following case:
3970 -- package java.lang.Object is
3971 -- type Typ is tagged limited private;
3972 -- type Ref is access all Typ'Class;
3974 -- type Typ is tagged limited ...;
3975 -- pragma Convention (Typ, Java)
3978 -- Because the convention appears after we have done the
3979 -- processing for type Ref.
3981 and then Convention (Designated_Type (Def_Id)) /= Convention_Java
3982 and then Convention (Designated_Type (Def_Id)) /= Convention_CIL
3984 Build_Class_Wide_Master (Def_Id);
3988 -- Start of processing for Expand_N_Full_Type_Declaration
3991 if Is_Access_Type (Def_Id) then
3992 Build_Master (Def_Id);
3994 if Ekind (Def_Id) = E_Access_Protected_Subprogram_Type then
3995 Expand_Access_Protected_Subprogram_Type (N);
3998 elsif Ada_Version >= Ada_05
3999 and then Is_Array_Type (Def_Id)
4000 and then Is_Access_Type (Component_Type (Def_Id))
4001 and then Ekind (Component_Type (Def_Id)) = E_Anonymous_Access_Type
4003 Build_Master (Component_Type (Def_Id));
4005 elsif Has_Task (Def_Id) then
4006 Expand_Previous_Access_Type (Def_Id);
4008 elsif Ada_Version >= Ada_05
4010 (Is_Record_Type (Def_Id)
4011 or else (Is_Array_Type (Def_Id)
4012 and then Is_Record_Type (Component_Type (Def_Id))))
4020 -- Look for the first anonymous access type component
4022 if Is_Array_Type (Def_Id) then
4023 Comp := First_Entity (Component_Type (Def_Id));
4025 Comp := First_Entity (Def_Id);
4028 while Present (Comp) loop
4029 Typ := Etype (Comp);
4031 exit when Is_Access_Type (Typ)
4032 and then Ekind (Typ) = E_Anonymous_Access_Type;
4037 -- If found we add a renaming declaration of master_id and we
4038 -- associate it to each anonymous access type component. Do
4039 -- nothing if the access type already has a master. This will be
4040 -- the case if the array type is the packed array created for a
4041 -- user-defined array type T, where the master_id is created when
4042 -- expanding the declaration for T.
4045 and then Ekind (Typ) = E_Anonymous_Access_Type
4046 and then not Restriction_Active (No_Task_Hierarchy)
4047 and then No (Master_Id (Typ))
4049 -- Do not consider run-times with no tasking support
4051 and then RTE_Available (RE_Current_Master)
4052 and then Has_Task (Non_Limited_Designated_Type (Typ))
4054 Build_Master_Entity (Def_Id);
4055 M_Id := Build_Master_Renaming (N, Def_Id);
4057 if Is_Array_Type (Def_Id) then
4058 Comp := First_Entity (Component_Type (Def_Id));
4060 Comp := First_Entity (Def_Id);
4063 while Present (Comp) loop
4064 Typ := Etype (Comp);
4066 if Is_Access_Type (Typ)
4067 and then Ekind (Typ) = E_Anonymous_Access_Type
4069 Set_Master_Id (Typ, M_Id);
4078 Par_Id := Etype (B_Id);
4080 -- The parent type is private then we need to inherit any TSS operations
4081 -- from the full view.
4083 if Ekind (Par_Id) in Private_Kind
4084 and then Present (Full_View (Par_Id))
4086 Par_Id := Base_Type (Full_View (Par_Id));
4089 if Nkind (Type_Definition (Original_Node (N))) =
4090 N_Derived_Type_Definition
4091 and then not Is_Tagged_Type (Def_Id)
4092 and then Present (Freeze_Node (Par_Id))
4093 and then Present (TSS_Elist (Freeze_Node (Par_Id)))
4095 Ensure_Freeze_Node (B_Id);
4096 FN := Freeze_Node (B_Id);
4098 if No (TSS_Elist (FN)) then
4099 Set_TSS_Elist (FN, New_Elmt_List);
4103 T_E : constant Elist_Id := TSS_Elist (FN);
4107 Elmt := First_Elmt (TSS_Elist (Freeze_Node (Par_Id)));
4108 while Present (Elmt) loop
4109 if Chars (Node (Elmt)) /= Name_uInit then
4110 Append_Elmt (Node (Elmt), T_E);
4116 -- If the derived type itself is private with a full view, then
4117 -- associate the full view with the inherited TSS_Elist as well.
4119 if Ekind (B_Id) in Private_Kind
4120 and then Present (Full_View (B_Id))
4122 Ensure_Freeze_Node (Base_Type (Full_View (B_Id)));
4124 (Freeze_Node (Base_Type (Full_View (B_Id))), TSS_Elist (FN));
4128 end Expand_N_Full_Type_Declaration;
4130 ---------------------------------
4131 -- Expand_N_Object_Declaration --
4132 ---------------------------------
4134 -- First we do special processing for objects of a tagged type where this
4135 -- is the point at which the type is frozen. The creation of the dispatch
4136 -- table and the initialization procedure have to be deferred to this
4137 -- point, since we reference previously declared primitive subprograms.
4139 -- For all types, we call an initialization procedure if there is one
4141 procedure Expand_N_Object_Declaration (N : Node_Id) is
4142 Def_Id : constant Entity_Id := Defining_Identifier (N);
4143 Expr : constant Node_Id := Expression (N);
4144 Loc : constant Source_Ptr := Sloc (N);
4145 Typ : constant Entity_Id := Etype (Def_Id);
4146 Base_Typ : constant Entity_Id := Base_Type (Typ);
4151 Init_After : Node_Id := N;
4152 -- Node after which the init proc call is to be inserted. This is
4153 -- normally N, except for the case of a shared passive variable, in
4154 -- which case the init proc call must be inserted only after the bodies
4155 -- of the shared variable procedures have been seen.
4158 -- Don't do anything for deferred constants. All proper actions will
4159 -- be expanded during the full declaration.
4161 if No (Expr) and Constant_Present (N) then
4165 -- Force construction of dispatch tables of library level tagged types
4167 if VM_Target = No_VM
4168 and then Static_Dispatch_Tables
4169 and then Is_Library_Level_Entity (Def_Id)
4170 and then Is_Library_Level_Tagged_Type (Base_Typ)
4171 and then (Ekind (Base_Typ) = E_Record_Type
4172 or else Ekind (Base_Typ) = E_Protected_Type
4173 or else Ekind (Base_Typ) = E_Task_Type)
4174 and then not Has_Dispatch_Table (Base_Typ)
4177 New_Nodes : List_Id := No_List;
4180 if Is_Concurrent_Type (Base_Typ) then
4181 New_Nodes := Make_DT (Corresponding_Record_Type (Base_Typ), N);
4183 New_Nodes := Make_DT (Base_Typ, N);
4186 if not Is_Empty_List (New_Nodes) then
4187 Insert_List_Before (N, New_Nodes);
4192 -- Make shared memory routines for shared passive variable
4194 if Is_Shared_Passive (Def_Id) then
4195 Init_After := Make_Shared_Var_Procs (N);
4198 -- If tasks being declared, make sure we have an activation chain
4199 -- defined for the tasks (has no effect if we already have one), and
4200 -- also that a Master variable is established and that the appropriate
4201 -- enclosing construct is established as a task master.
4203 if Has_Task (Typ) then
4204 Build_Activation_Chain_Entity (N);
4205 Build_Master_Entity (Def_Id);
4208 -- Build a list controller for declarations where the type is anonymous
4209 -- access and the designated type is controlled. Only declarations from
4210 -- source files receive such controllers in order to provide the same
4211 -- lifespan for any potential coextensions that may be associated with
4212 -- the object. Finalization lists of internal controlled anonymous
4213 -- access objects are already handled in Expand_N_Allocator.
4215 if Comes_From_Source (N)
4216 and then Ekind (Typ) = E_Anonymous_Access_Type
4217 and then Is_Controlled (Directly_Designated_Type (Typ))
4218 and then No (Associated_Final_Chain (Typ))
4220 Build_Final_List (N, Typ);
4223 -- Default initialization required, and no expression present
4227 -- Expand Initialize call for controlled objects. One may wonder why
4228 -- the Initialize Call is not done in the regular Init procedure
4229 -- attached to the record type. That's because the init procedure is
4230 -- recursively called on each component, including _Parent, thus the
4231 -- Init call for a controlled object would generate not only one
4232 -- Initialize call as it is required but one for each ancestor of
4233 -- its type. This processing is suppressed if No_Initialization set.
4235 if not Needs_Finalization (Typ)
4236 or else No_Initialization (N)
4240 elsif not Abort_Allowed
4241 or else not Comes_From_Source (N)
4243 Insert_Actions_After (Init_After,
4245 Ref => New_Occurrence_Of (Def_Id, Loc),
4246 Typ => Base_Type (Typ),
4247 Flist_Ref => Find_Final_List (Def_Id),
4248 With_Attach => Make_Integer_Literal (Loc, 1)));
4253 -- We need to protect the initialize call
4257 -- Initialize (...);
4259 -- Undefer_Abort.all;
4262 -- ??? this won't protect the initialize call for controlled
4263 -- components which are part of the init proc, so this block
4264 -- should probably also contain the call to _init_proc but this
4265 -- requires some code reorganization...
4268 L : constant List_Id :=
4270 (Ref => New_Occurrence_Of (Def_Id, Loc),
4271 Typ => Base_Type (Typ),
4272 Flist_Ref => Find_Final_List (Def_Id),
4273 With_Attach => Make_Integer_Literal (Loc, 1));
4275 Blk : constant Node_Id :=
4276 Make_Block_Statement (Loc,
4277 Handled_Statement_Sequence =>
4278 Make_Handled_Sequence_Of_Statements (Loc, L));
4281 Prepend_To (L, Build_Runtime_Call (Loc, RE_Abort_Defer));
4282 Set_At_End_Proc (Handled_Statement_Sequence (Blk),
4283 New_Occurrence_Of (RTE (RE_Abort_Undefer_Direct), Loc));
4284 Insert_Actions_After (Init_After, New_List (Blk));
4285 Expand_At_End_Handler
4286 (Handled_Statement_Sequence (Blk), Entity (Identifier (Blk)));
4290 -- Call type initialization procedure if there is one. We build the
4291 -- call and put it immediately after the object declaration, so that
4292 -- it will be expanded in the usual manner. Note that this will
4293 -- result in proper handling of defaulted discriminants.
4295 -- Need call if there is a base init proc
4297 if Has_Non_Null_Base_Init_Proc (Typ)
4299 -- Suppress call if No_Initialization set on declaration
4301 and then not No_Initialization (N)
4303 -- Suppress call for special case of value type for VM
4305 and then not Is_Value_Type (Typ)
4307 -- Suppress call if Suppress_Init_Proc set on the type. This is
4308 -- needed for the derived type case, where Suppress_Initialization
4309 -- may be set for the derived type, even if there is an init proc
4310 -- defined for the root type.
4312 and then not Suppress_Init_Proc (Typ)
4314 -- Return without initializing when No_Default_Initialization
4315 -- applies. Note that the actual restriction check occurs later,
4316 -- when the object is frozen, because we don't know yet whether
4317 -- the object is imported, which is a case where the check does
4320 if Restriction_Active (No_Default_Initialization) then
4324 -- The call to the initialization procedure does NOT freeze the
4325 -- object being initialized. This is because the call is not a
4326 -- source level call. This works fine, because the only possible
4327 -- statements depending on freeze status that can appear after the
4328 -- _Init call are rep clauses which can safely appear after actual
4329 -- references to the object.
4331 Id_Ref := New_Reference_To (Def_Id, Loc);
4332 Set_Must_Not_Freeze (Id_Ref);
4333 Set_Assignment_OK (Id_Ref);
4336 Init_Expr : constant Node_Id :=
4337 Static_Initialization (Base_Init_Proc (Typ));
4339 if Present (Init_Expr) then
4341 (N, New_Copy_Tree (Init_Expr, New_Scope => Current_Scope));
4344 Initialization_Warning (Id_Ref);
4346 Insert_Actions_After (Init_After,
4347 Build_Initialization_Call (Loc, Id_Ref, Typ));
4351 -- If simple initialization is required, then set an appropriate
4352 -- simple initialization expression in place. This special
4353 -- initialization is required even though No_Init_Flag is present,
4354 -- but is not needed if there was an explicit initialization.
4356 -- An internally generated temporary needs no initialization because
4357 -- it will be assigned subsequently. In particular, there is no point
4358 -- in applying Initialize_Scalars to such a temporary.
4360 elsif Needs_Simple_Initialization (Typ)
4361 and then not Is_Internal (Def_Id)
4362 and then not Has_Init_Expression (N)
4364 Set_No_Initialization (N, False);
4365 Set_Expression (N, Get_Simple_Init_Val (Typ, N, Esize (Def_Id)));
4366 Analyze_And_Resolve (Expression (N), Typ);
4369 -- Generate attribute for Persistent_BSS if needed
4371 if Persistent_BSS_Mode
4372 and then Comes_From_Source (N)
4373 and then Is_Potentially_Persistent_Type (Typ)
4374 and then not Has_Init_Expression (N)
4375 and then Is_Library_Level_Entity (Def_Id)
4381 Make_Linker_Section_Pragma
4382 (Def_Id, Sloc (N), ".persistent.bss");
4383 Insert_After (N, Prag);
4388 -- If access type, then we know it is null if not initialized
4390 if Is_Access_Type (Typ) then
4391 Set_Is_Known_Null (Def_Id);
4394 -- Explicit initialization present
4397 -- Obtain actual expression from qualified expression
4399 if Nkind (Expr) = N_Qualified_Expression then
4400 Expr_Q := Expression (Expr);
4405 -- When we have the appropriate type of aggregate in the expression
4406 -- (it has been determined during analysis of the aggregate by
4407 -- setting the delay flag), let's perform in place assignment and
4408 -- thus avoid creating a temporary.
4410 if Is_Delayed_Aggregate (Expr_Q) then
4411 Convert_Aggr_In_Object_Decl (N);
4413 -- Ada 2005 (AI-318-02): If the initialization expression is a call
4414 -- to a build-in-place function, then access to the declared object
4415 -- must be passed to the function. Currently we limit such functions
4416 -- to those with constrained limited result subtypes, but eventually
4417 -- plan to expand the allowed forms of functions that are treated as
4420 elsif Ada_Version >= Ada_05
4421 and then Is_Build_In_Place_Function_Call (Expr_Q)
4423 Make_Build_In_Place_Call_In_Object_Declaration (N, Expr_Q);
4425 -- The previous call expands the expression initializing the
4426 -- built-in-place object into further code that will be analyzed
4427 -- later. No further expansion needed here.
4432 -- In most cases, we must check that the initial value meets any
4433 -- constraint imposed by the declared type. However, there is one
4434 -- very important exception to this rule. If the entity has an
4435 -- unconstrained nominal subtype, then it acquired its constraints
4436 -- from the expression in the first place, and not only does this
4437 -- mean that the constraint check is not needed, but an attempt to
4438 -- perform the constraint check can cause order of elaboration
4441 if not Is_Constr_Subt_For_U_Nominal (Typ) then
4443 -- If this is an allocator for an aggregate that has been
4444 -- allocated in place, delay checks until assignments are
4445 -- made, because the discriminants are not initialized.
4447 if Nkind (Expr) = N_Allocator
4448 and then No_Initialization (Expr)
4452 Apply_Constraint_Check (Expr, Typ);
4456 -- Ada 2005 (AI-251): Rewrite the expression that initializes a
4457 -- class-wide object to ensure that we copy the full object,
4458 -- unless we are targetting a VM where interfaces are handled by
4459 -- VM itself. Note that if the root type of Typ is an ancestor
4460 -- of Expr's type, both types share the same dispatch table and
4461 -- there is no need to displace the pointer.
4464 -- CW : I'Class := Obj;
4466 -- Temp : I'Class := I'Class (Base_Address (Obj'Address));
4467 -- CW : I'Class renames Displace (Temp, I'Tag);
4469 if Is_Interface (Typ)
4470 and then Is_Class_Wide_Type (Typ)
4472 (Is_Class_Wide_Type (Etype (Expr))
4474 not Is_Ancestor (Root_Type (Typ), Etype (Expr)))
4475 and then Comes_From_Source (Def_Id)
4476 and then VM_Target = No_VM
4484 Make_Object_Declaration (Loc,
4485 Defining_Identifier =>
4486 Make_Defining_Identifier (Loc,
4487 New_Internal_Name ('D')),
4489 Object_Definition =>
4490 Make_Attribute_Reference (Loc,
4493 (Root_Type (Etype (Def_Id)), Loc),
4494 Attribute_Name => Name_Class),
4497 Unchecked_Convert_To
4498 (Class_Wide_Type (Root_Type (Etype (Def_Id))),
4499 Make_Explicit_Dereference (Loc,
4500 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4501 Make_Function_Call (Loc,
4503 New_Reference_To (RTE (RE_Base_Address),
4505 Parameter_Associations => New_List (
4506 Make_Attribute_Reference (Loc,
4507 Prefix => Relocate_Node (Expr),
4508 Attribute_Name => Name_Address)))))));
4510 Insert_Action (N, Decl_1);
4513 Make_Object_Renaming_Declaration (Loc,
4514 Defining_Identifier =>
4515 Make_Defining_Identifier (Loc,
4516 New_Internal_Name ('D')),
4519 Make_Attribute_Reference (Loc,
4522 (Root_Type (Etype (Def_Id)), Loc),
4523 Attribute_Name => Name_Class),
4526 Unchecked_Convert_To (
4527 Class_Wide_Type (Root_Type (Etype (Def_Id))),
4528 Make_Explicit_Dereference (Loc,
4529 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4530 Make_Function_Call (Loc,
4532 New_Reference_To (RTE (RE_Displace), Loc),
4534 Parameter_Associations => New_List (
4535 Make_Attribute_Reference (Loc,
4538 (Defining_Identifier (Decl_1), Loc),
4539 Attribute_Name => Name_Address),
4541 Unchecked_Convert_To (RTE (RE_Tag),
4546 (Root_Type (Typ)))),
4549 Rewrite (N, Decl_2);
4552 -- Replace internal identifier of Decl_2 by the identifier
4553 -- found in the sources. We also have to exchange entities
4554 -- containing their defining identifiers to ensure the
4555 -- correct replacement of the object declaration by this
4556 -- object renaming declaration (because such definings
4557 -- identifier have been previously added by Enter_Name to
4558 -- the current scope). We must preserve the homonym chain
4559 -- of the source entity as well.
4561 Set_Chars (Defining_Identifier (N), Chars (Def_Id));
4562 Set_Homonym (Defining_Identifier (N), Homonym (Def_Id));
4563 Exchange_Entities (Defining_Identifier (N), Def_Id);
4569 -- If the type is controlled and not inherently limited, then
4570 -- the target is adjusted after the copy and attached to the
4571 -- finalization list. However, no adjustment is done in the case
4572 -- where the object was initialized by a call to a function whose
4573 -- result is built in place, since no copy occurred. (Eventually
4574 -- we plan to support in-place function results for some cases
4575 -- of nonlimited types. ???)
4577 if Needs_Finalization (Typ)
4578 and then not Is_Inherently_Limited_Type (Typ)
4580 Insert_Actions_After (Init_After,
4582 Ref => New_Reference_To (Def_Id, Loc),
4583 Typ => Base_Type (Typ),
4584 Flist_Ref => Find_Final_List (Def_Id),
4585 With_Attach => Make_Integer_Literal (Loc, 1)));
4588 -- For tagged types, when an init value is given, the tag has to
4589 -- be re-initialized separately in order to avoid the propagation
4590 -- of a wrong tag coming from a view conversion unless the type
4591 -- is class wide (in this case the tag comes from the init value).
4592 -- Suppress the tag assignment when VM_Target because VM tags are
4593 -- represented implicitly in objects. Ditto for types that are
4594 -- CPP_CLASS, and for initializations that are aggregates, because
4595 -- they have to have the right tag.
4597 if Is_Tagged_Type (Typ)
4598 and then not Is_Class_Wide_Type (Typ)
4599 and then not Is_CPP_Class (Typ)
4600 and then VM_Target = No_VM
4601 and then Nkind (Expr) /= N_Aggregate
4603 -- The re-assignment of the tag has to be done even if the
4604 -- object is a constant.
4607 Make_Selected_Component (Loc,
4608 Prefix => New_Reference_To (Def_Id, Loc),
4610 New_Reference_To (First_Tag_Component (Typ), Loc));
4612 Set_Assignment_OK (New_Ref);
4614 Insert_After (Init_After,
4615 Make_Assignment_Statement (Loc,
4618 Unchecked_Convert_To (RTE (RE_Tag),
4622 (Access_Disp_Table (Base_Type (Typ)))),
4625 -- For discrete types, set the Is_Known_Valid flag if the
4626 -- initializing value is known to be valid.
4628 elsif Is_Discrete_Type (Typ) and then Expr_Known_Valid (Expr) then
4629 Set_Is_Known_Valid (Def_Id);
4631 elsif Is_Access_Type (Typ) then
4633 -- For access types set the Is_Known_Non_Null flag if the
4634 -- initializing value is known to be non-null. We can also set
4635 -- Can_Never_Be_Null if this is a constant.
4637 if Known_Non_Null (Expr) then
4638 Set_Is_Known_Non_Null (Def_Id, True);
4640 if Constant_Present (N) then
4641 Set_Can_Never_Be_Null (Def_Id);
4646 -- If validity checking on copies, validate initial expression.
4647 -- But skip this if declaration is for a generic type, since it
4648 -- makes no sense to validate generic types. Not clear if this
4649 -- can happen for legal programs, but it definitely can arise
4650 -- from previous instantiation errors.
4652 if Validity_Checks_On
4653 and then Validity_Check_Copies
4654 and then not Is_Generic_Type (Etype (Def_Id))
4656 Ensure_Valid (Expr);
4657 Set_Is_Known_Valid (Def_Id);
4661 -- Cases where the back end cannot handle the initialization directly
4662 -- In such cases, we expand an assignment that will be appropriately
4663 -- handled by Expand_N_Assignment_Statement.
4665 -- The exclusion of the unconstrained case is wrong, but for now it
4666 -- is too much trouble ???
4668 if (Is_Possibly_Unaligned_Slice (Expr)
4669 or else (Is_Possibly_Unaligned_Object (Expr)
4670 and then not Represented_As_Scalar (Etype (Expr))))
4672 -- The exclusion of the unconstrained case is wrong, but for now
4673 -- it is too much trouble ???
4675 and then not (Is_Array_Type (Etype (Expr))
4676 and then not Is_Constrained (Etype (Expr)))
4679 Stat : constant Node_Id :=
4680 Make_Assignment_Statement (Loc,
4681 Name => New_Reference_To (Def_Id, Loc),
4682 Expression => Relocate_Node (Expr));
4684 Set_Expression (N, Empty);
4685 Set_No_Initialization (N);
4686 Set_Assignment_OK (Name (Stat));
4687 Set_No_Ctrl_Actions (Stat);
4688 Insert_After_And_Analyze (Init_After, Stat);
4692 -- Final transformation, if the initializing expression is an entity
4693 -- for a variable with OK_To_Rename set, then we transform:
4699 -- X : typ renames expr
4701 -- provided that X is not aliased. The aliased case has to be
4702 -- excluded in general because expr will not be aliased in general.
4704 if not Aliased_Present (N)
4705 and then Is_Entity_Name (Expr_Q)
4706 and then Ekind (Entity (Expr_Q)) = E_Variable
4707 and then OK_To_Rename (Entity (Expr_Q))
4708 and then Is_Entity_Name (Object_Definition (N))
4711 Make_Object_Renaming_Declaration (Loc,
4712 Defining_Identifier => Defining_Identifier (N),
4713 Subtype_Mark => Object_Definition (N),
4716 -- We do not analyze this renaming declaration, because all its
4717 -- components have already been analyzed, and if we were to go
4718 -- ahead and analyze it, we would in effect be trying to generate
4719 -- another declaration of X, which won't do!
4721 Set_Renamed_Object (Defining_Identifier (N), Expr_Q);
4728 when RE_Not_Available =>
4730 end Expand_N_Object_Declaration;
4732 ---------------------------------
4733 -- Expand_N_Subtype_Indication --
4734 ---------------------------------
4736 -- Add a check on the range of the subtype. The static case is partially
4737 -- duplicated by Process_Range_Expr_In_Decl in Sem_Ch3, but we still need
4738 -- to check here for the static case in order to avoid generating
4739 -- extraneous expanded code. Also deal with validity checking.
4741 procedure Expand_N_Subtype_Indication (N : Node_Id) is
4742 Ran : constant Node_Id := Range_Expression (Constraint (N));
4743 Typ : constant Entity_Id := Entity (Subtype_Mark (N));
4746 if Nkind (Constraint (N)) = N_Range_Constraint then
4747 Validity_Check_Range (Range_Expression (Constraint (N)));
4750 if Nkind_In (Parent (N), N_Constrained_Array_Definition, N_Slice) then
4751 Apply_Range_Check (Ran, Typ);
4753 end Expand_N_Subtype_Indication;
4755 ---------------------------
4756 -- Expand_N_Variant_Part --
4757 ---------------------------
4759 -- If the last variant does not contain the Others choice, replace it with
4760 -- an N_Others_Choice node since Gigi always wants an Others. Note that we
4761 -- do not bother to call Analyze on the modified variant part, since it's
4762 -- only effect would be to compute the Others_Discrete_Choices node
4763 -- laboriously, and of course we already know the list of choices that
4764 -- corresponds to the others choice (it's the list we are replacing!)
4766 procedure Expand_N_Variant_Part (N : Node_Id) is
4767 Last_Var : constant Node_Id := Last_Non_Pragma (Variants (N));
4768 Others_Node : Node_Id;
4770 if Nkind (First (Discrete_Choices (Last_Var))) /= N_Others_Choice then
4771 Others_Node := Make_Others_Choice (Sloc (Last_Var));
4772 Set_Others_Discrete_Choices
4773 (Others_Node, Discrete_Choices (Last_Var));
4774 Set_Discrete_Choices (Last_Var, New_List (Others_Node));
4776 end Expand_N_Variant_Part;
4778 ---------------------------------
4779 -- Expand_Previous_Access_Type --
4780 ---------------------------------
4782 procedure Expand_Previous_Access_Type (Def_Id : Entity_Id) is
4783 T : Entity_Id := First_Entity (Current_Scope);
4786 -- Find all access types declared in the current scope, whose
4787 -- designated type is Def_Id. If it does not have a Master_Id,
4790 while Present (T) loop
4791 if Is_Access_Type (T)
4792 and then Designated_Type (T) = Def_Id
4793 and then No (Master_Id (T))
4795 Build_Master_Entity (Def_Id);
4796 Build_Master_Renaming (Parent (Def_Id), T);
4801 end Expand_Previous_Access_Type;
4803 ------------------------------
4804 -- Expand_Record_Controller --
4805 ------------------------------
4807 procedure Expand_Record_Controller (T : Entity_Id) is
4808 Def : Node_Id := Type_Definition (Parent (T));
4809 Comp_List : Node_Id;
4810 Comp_Decl : Node_Id;
4812 First_Comp : Node_Id;
4813 Controller_Type : Entity_Id;
4817 if Nkind (Def) = N_Derived_Type_Definition then
4818 Def := Record_Extension_Part (Def);
4821 if Null_Present (Def) then
4822 Set_Component_List (Def,
4823 Make_Component_List (Sloc (Def),
4824 Component_Items => Empty_List,
4825 Variant_Part => Empty,
4826 Null_Present => True));
4829 Comp_List := Component_List (Def);
4831 if Null_Present (Comp_List)
4832 or else Is_Empty_List (Component_Items (Comp_List))
4834 Loc := Sloc (Comp_List);
4836 Loc := Sloc (First (Component_Items (Comp_List)));
4839 if Is_Inherently_Limited_Type (T) then
4840 Controller_Type := RTE (RE_Limited_Record_Controller);
4842 Controller_Type := RTE (RE_Record_Controller);
4845 Ent := Make_Defining_Identifier (Loc, Name_uController);
4848 Make_Component_Declaration (Loc,
4849 Defining_Identifier => Ent,
4850 Component_Definition =>
4851 Make_Component_Definition (Loc,
4852 Aliased_Present => False,
4853 Subtype_Indication => New_Reference_To (Controller_Type, Loc)));
4855 if Null_Present (Comp_List)
4856 or else Is_Empty_List (Component_Items (Comp_List))
4858 Set_Component_Items (Comp_List, New_List (Comp_Decl));
4859 Set_Null_Present (Comp_List, False);
4862 -- The controller cannot be placed before the _Parent field since
4863 -- gigi lays out field in order and _parent must be first to preserve
4864 -- the polymorphism of tagged types.
4866 First_Comp := First (Component_Items (Comp_List));
4868 if not Is_Tagged_Type (T) then
4869 Insert_Before (First_Comp, Comp_Decl);
4871 -- if T is a tagged type, place controller declaration after parent
4872 -- field and after eventual tags of interface types.
4875 while Present (First_Comp)
4877 (Chars (Defining_Identifier (First_Comp)) = Name_uParent
4878 or else Is_Tag (Defining_Identifier (First_Comp))
4880 -- Ada 2005 (AI-251): The following condition covers secondary
4881 -- tags but also the adjacent component containing the offset
4882 -- to the base of the object (component generated if the parent
4883 -- has discriminants --- see Add_Interface_Tag_Components).
4884 -- This is required to avoid the addition of the controller
4885 -- between the secondary tag and its adjacent component.
4889 (Defining_Identifier (First_Comp))))
4894 -- An empty tagged extension might consist only of the parent
4895 -- component. Otherwise insert the controller before the first
4896 -- component that is neither parent nor tag.
4898 if Present (First_Comp) then
4899 Insert_Before (First_Comp, Comp_Decl);
4901 Append (Comp_Decl, Component_Items (Comp_List));
4907 Analyze (Comp_Decl);
4908 Set_Ekind (Ent, E_Component);
4909 Init_Component_Location (Ent);
4911 -- Move the _controller entity ahead in the list of internal entities
4912 -- of the enclosing record so that it is selected instead of a
4913 -- potentially inherited one.
4916 E : constant Entity_Id := Last_Entity (T);
4920 pragma Assert (Chars (E) = Name_uController);
4922 Set_Next_Entity (E, First_Entity (T));
4923 Set_First_Entity (T, E);
4925 Comp := Next_Entity (E);
4926 while Next_Entity (Comp) /= E loop
4930 Set_Next_Entity (Comp, Empty);
4931 Set_Last_Entity (T, Comp);
4937 when RE_Not_Available =>
4939 end Expand_Record_Controller;
4941 ------------------------
4942 -- Expand_Tagged_Root --
4943 ------------------------
4945 procedure Expand_Tagged_Root (T : Entity_Id) is
4946 Def : constant Node_Id := Type_Definition (Parent (T));
4947 Comp_List : Node_Id;
4948 Comp_Decl : Node_Id;
4949 Sloc_N : Source_Ptr;
4952 if Null_Present (Def) then
4953 Set_Component_List (Def,
4954 Make_Component_List (Sloc (Def),
4955 Component_Items => Empty_List,
4956 Variant_Part => Empty,
4957 Null_Present => True));
4960 Comp_List := Component_List (Def);
4962 if Null_Present (Comp_List)
4963 or else Is_Empty_List (Component_Items (Comp_List))
4965 Sloc_N := Sloc (Comp_List);
4967 Sloc_N := Sloc (First (Component_Items (Comp_List)));
4971 Make_Component_Declaration (Sloc_N,
4972 Defining_Identifier => First_Tag_Component (T),
4973 Component_Definition =>
4974 Make_Component_Definition (Sloc_N,
4975 Aliased_Present => False,
4976 Subtype_Indication => New_Reference_To (RTE (RE_Tag), Sloc_N)));
4978 if Null_Present (Comp_List)
4979 or else Is_Empty_List (Component_Items (Comp_List))
4981 Set_Component_Items (Comp_List, New_List (Comp_Decl));
4982 Set_Null_Present (Comp_List, False);
4985 Insert_Before (First (Component_Items (Comp_List)), Comp_Decl);
4988 -- We don't Analyze the whole expansion because the tag component has
4989 -- already been analyzed previously. Here we just insure that the tree
4990 -- is coherent with the semantic decoration
4992 Find_Type (Subtype_Indication (Component_Definition (Comp_Decl)));
4995 when RE_Not_Available =>
4997 end Expand_Tagged_Root;
4999 ----------------------
5000 -- Clean_Task_Names --
5001 ----------------------
5003 procedure Clean_Task_Names
5005 Proc_Id : Entity_Id)
5009 and then not Restriction_Active (No_Implicit_Heap_Allocations)
5010 and then not Global_Discard_Names
5011 and then VM_Target = No_VM
5013 Set_Uses_Sec_Stack (Proc_Id);
5015 end Clean_Task_Names;
5017 -----------------------
5018 -- Freeze_Array_Type --
5019 -----------------------
5021 procedure Freeze_Array_Type (N : Node_Id) is
5022 Typ : constant Entity_Id := Entity (N);
5023 Comp_Typ : constant Entity_Id := Component_Type (Typ);
5024 Base : constant Entity_Id := Base_Type (Typ);
5027 if not Is_Bit_Packed_Array (Typ) then
5029 -- If the component contains tasks, so does the array type. This may
5030 -- not be indicated in the array type because the component may have
5031 -- been a private type at the point of definition. Same if component
5032 -- type is controlled.
5034 Set_Has_Task (Base, Has_Task (Comp_Typ));
5035 Set_Has_Controlled_Component (Base,
5036 Has_Controlled_Component (Comp_Typ)
5037 or else Is_Controlled (Comp_Typ));
5039 if No (Init_Proc (Base)) then
5041 -- If this is an anonymous array created for a declaration with
5042 -- an initial value, its init_proc will never be called. The
5043 -- initial value itself may have been expanded into assignments,
5044 -- in which case the object declaration is carries the
5045 -- No_Initialization flag.
5048 and then Nkind (Associated_Node_For_Itype (Base)) =
5049 N_Object_Declaration
5050 and then (Present (Expression (Associated_Node_For_Itype (Base)))
5052 No_Initialization (Associated_Node_For_Itype (Base)))
5056 -- We do not need an init proc for string or wide [wide] string,
5057 -- since the only time these need initialization in normalize or
5058 -- initialize scalars mode, and these types are treated specially
5059 -- and do not need initialization procedures.
5061 elsif Root_Type (Base) = Standard_String
5062 or else Root_Type (Base) = Standard_Wide_String
5063 or else Root_Type (Base) = Standard_Wide_Wide_String
5067 -- Otherwise we have to build an init proc for the subtype
5070 Build_Array_Init_Proc (Base, N);
5075 if Has_Controlled_Component (Base) then
5076 Build_Controlling_Procs (Base);
5078 if not Is_Limited_Type (Comp_Typ)
5079 and then Number_Dimensions (Typ) = 1
5081 Build_Slice_Assignment (Typ);
5084 elsif Ekind (Comp_Typ) = E_Anonymous_Access_Type
5085 and then Needs_Finalization (Directly_Designated_Type (Comp_Typ))
5087 Set_Associated_Final_Chain (Comp_Typ, Add_Final_Chain (Typ));
5091 -- For packed case, default initialization, except if the component type
5092 -- is itself a packed structure with an initialization procedure, or
5093 -- initialize/normalize scalars active, and we have a base type, or the
5094 -- type is public, because in that case a client might specify
5095 -- Normalize_Scalars and there better be a public Init_Proc for it.
5097 elsif (Present (Init_Proc (Component_Type (Base)))
5098 and then No (Base_Init_Proc (Base)))
5099 or else (Init_Or_Norm_Scalars and then Base = Typ)
5100 or else Is_Public (Typ)
5102 Build_Array_Init_Proc (Base, N);
5104 end Freeze_Array_Type;
5106 -----------------------------
5107 -- Freeze_Enumeration_Type --
5108 -----------------------------
5110 procedure Freeze_Enumeration_Type (N : Node_Id) is
5111 Typ : constant Entity_Id := Entity (N);
5112 Loc : constant Source_Ptr := Sloc (Typ);
5119 Is_Contiguous : Boolean;
5124 pragma Warnings (Off, Func);
5127 -- Various optimizations possible if given representation is contiguous
5129 Is_Contiguous := True;
5131 Ent := First_Literal (Typ);
5132 Last_Repval := Enumeration_Rep (Ent);
5135 while Present (Ent) loop
5136 if Enumeration_Rep (Ent) - Last_Repval /= 1 then
5137 Is_Contiguous := False;
5140 Last_Repval := Enumeration_Rep (Ent);
5146 if Is_Contiguous then
5147 Set_Has_Contiguous_Rep (Typ);
5148 Ent := First_Literal (Typ);
5150 Lst := New_List (New_Reference_To (Ent, Sloc (Ent)));
5153 -- Build list of literal references
5158 Ent := First_Literal (Typ);
5159 while Present (Ent) loop
5160 Append_To (Lst, New_Reference_To (Ent, Sloc (Ent)));
5166 -- Now build an array declaration
5168 -- typA : array (Natural range 0 .. num - 1) of ctype :=
5169 -- (v, v, v, v, v, ....)
5171 -- where ctype is the corresponding integer type. If the representation
5172 -- is contiguous, we only keep the first literal, which provides the
5173 -- offset for Pos_To_Rep computations.
5176 Make_Defining_Identifier (Loc,
5177 Chars => New_External_Name (Chars (Typ), 'A'));
5179 Append_Freeze_Action (Typ,
5180 Make_Object_Declaration (Loc,
5181 Defining_Identifier => Arr,
5182 Constant_Present => True,
5184 Object_Definition =>
5185 Make_Constrained_Array_Definition (Loc,
5186 Discrete_Subtype_Definitions => New_List (
5187 Make_Subtype_Indication (Loc,
5188 Subtype_Mark => New_Reference_To (Standard_Natural, Loc),
5190 Make_Range_Constraint (Loc,
5194 Make_Integer_Literal (Loc, 0),
5196 Make_Integer_Literal (Loc, Num - 1))))),
5198 Component_Definition =>
5199 Make_Component_Definition (Loc,
5200 Aliased_Present => False,
5201 Subtype_Indication => New_Reference_To (Typ, Loc))),
5204 Make_Aggregate (Loc,
5205 Expressions => Lst)));
5207 Set_Enum_Pos_To_Rep (Typ, Arr);
5209 -- Now we build the function that converts representation values to
5210 -- position values. This function has the form:
5212 -- function _Rep_To_Pos (A : etype; F : Boolean) return Integer is
5215 -- when enum-lit'Enum_Rep => return posval;
5216 -- when enum-lit'Enum_Rep => return posval;
5219 -- [raise Constraint_Error when F "invalid data"]
5224 -- Note: the F parameter determines whether the others case (no valid
5225 -- representation) raises Constraint_Error or returns a unique value
5226 -- of minus one. The latter case is used, e.g. in 'Valid code.
5228 -- Note: the reason we use Enum_Rep values in the case here is to avoid
5229 -- the code generator making inappropriate assumptions about the range
5230 -- of the values in the case where the value is invalid. ityp is a
5231 -- signed or unsigned integer type of appropriate width.
5233 -- Note: if exceptions are not supported, then we suppress the raise
5234 -- and return -1 unconditionally (this is an erroneous program in any
5235 -- case and there is no obligation to raise Constraint_Error here!) We
5236 -- also do this if pragma Restrictions (No_Exceptions) is active.
5238 -- Is this right??? What about No_Exception_Propagation???
5240 -- Representations are signed
5242 if Enumeration_Rep (First_Literal (Typ)) < 0 then
5244 -- The underlying type is signed. Reset the Is_Unsigned_Type
5245 -- explicitly, because it might have been inherited from
5248 Set_Is_Unsigned_Type (Typ, False);
5250 if Esize (Typ) <= Standard_Integer_Size then
5251 Ityp := Standard_Integer;
5253 Ityp := Universal_Integer;
5256 -- Representations are unsigned
5259 if Esize (Typ) <= Standard_Integer_Size then
5260 Ityp := RTE (RE_Unsigned);
5262 Ityp := RTE (RE_Long_Long_Unsigned);
5266 -- The body of the function is a case statement. First collect case
5267 -- alternatives, or optimize the contiguous case.
5271 -- If representation is contiguous, Pos is computed by subtracting
5272 -- the representation of the first literal.
5274 if Is_Contiguous then
5275 Ent := First_Literal (Typ);
5277 if Enumeration_Rep (Ent) = Last_Repval then
5279 -- Another special case: for a single literal, Pos is zero
5281 Pos_Expr := Make_Integer_Literal (Loc, Uint_0);
5285 Convert_To (Standard_Integer,
5286 Make_Op_Subtract (Loc,
5288 Unchecked_Convert_To (Ityp,
5289 Make_Identifier (Loc, Name_uA)),
5291 Make_Integer_Literal (Loc,
5293 Enumeration_Rep (First_Literal (Typ)))));
5297 Make_Case_Statement_Alternative (Loc,
5298 Discrete_Choices => New_List (
5299 Make_Range (Sloc (Enumeration_Rep_Expr (Ent)),
5301 Make_Integer_Literal (Loc,
5302 Intval => Enumeration_Rep (Ent)),
5304 Make_Integer_Literal (Loc, Intval => Last_Repval))),
5306 Statements => New_List (
5307 Make_Simple_Return_Statement (Loc,
5308 Expression => Pos_Expr))));
5311 Ent := First_Literal (Typ);
5312 while Present (Ent) loop
5314 Make_Case_Statement_Alternative (Loc,
5315 Discrete_Choices => New_List (
5316 Make_Integer_Literal (Sloc (Enumeration_Rep_Expr (Ent)),
5317 Intval => Enumeration_Rep (Ent))),
5319 Statements => New_List (
5320 Make_Simple_Return_Statement (Loc,
5322 Make_Integer_Literal (Loc,
5323 Intval => Enumeration_Pos (Ent))))));
5329 -- In normal mode, add the others clause with the test
5331 if not No_Exception_Handlers_Set then
5333 Make_Case_Statement_Alternative (Loc,
5334 Discrete_Choices => New_List (Make_Others_Choice (Loc)),
5335 Statements => New_List (
5336 Make_Raise_Constraint_Error (Loc,
5337 Condition => Make_Identifier (Loc, Name_uF),
5338 Reason => CE_Invalid_Data),
5339 Make_Simple_Return_Statement (Loc,
5341 Make_Integer_Literal (Loc, -1)))));
5343 -- If either of the restrictions No_Exceptions_Handlers/Propagation is
5344 -- active then return -1 (we cannot usefully raise Constraint_Error in
5345 -- this case). See description above for further details.
5349 Make_Case_Statement_Alternative (Loc,
5350 Discrete_Choices => New_List (Make_Others_Choice (Loc)),
5351 Statements => New_List (
5352 Make_Simple_Return_Statement (Loc,
5354 Make_Integer_Literal (Loc, -1)))));
5357 -- Now we can build the function body
5360 Make_Defining_Identifier (Loc, Make_TSS_Name (Typ, TSS_Rep_To_Pos));
5363 Make_Subprogram_Body (Loc,
5365 Make_Function_Specification (Loc,
5366 Defining_Unit_Name => Fent,
5367 Parameter_Specifications => New_List (
5368 Make_Parameter_Specification (Loc,
5369 Defining_Identifier =>
5370 Make_Defining_Identifier (Loc, Name_uA),
5371 Parameter_Type => New_Reference_To (Typ, Loc)),
5372 Make_Parameter_Specification (Loc,
5373 Defining_Identifier =>
5374 Make_Defining_Identifier (Loc, Name_uF),
5375 Parameter_Type => New_Reference_To (Standard_Boolean, Loc))),
5377 Result_Definition => New_Reference_To (Standard_Integer, Loc)),
5379 Declarations => Empty_List,
5381 Handled_Statement_Sequence =>
5382 Make_Handled_Sequence_Of_Statements (Loc,
5383 Statements => New_List (
5384 Make_Case_Statement (Loc,
5386 Unchecked_Convert_To (Ityp,
5387 Make_Identifier (Loc, Name_uA)),
5388 Alternatives => Lst))));
5390 Set_TSS (Typ, Fent);
5393 if not Debug_Generated_Code then
5394 Set_Debug_Info_Off (Fent);
5398 when RE_Not_Available =>
5400 end Freeze_Enumeration_Type;
5402 ------------------------
5403 -- Freeze_Record_Type --
5404 ------------------------
5406 procedure Freeze_Record_Type (N : Node_Id) is
5408 procedure Add_Internal_Interface_Entities (Tagged_Type : Entity_Id);
5409 -- Add to the list of primitives of Tagged_Types the internal entities
5410 -- associated with interface primitives that are located in secondary
5413 -------------------------------------
5414 -- Add_Internal_Interface_Entities --
5415 -------------------------------------
5417 procedure Add_Internal_Interface_Entities (Tagged_Type : Entity_Id) is
5420 Iface_Elmt : Elmt_Id;
5421 Iface_Prim : Entity_Id;
5422 Ifaces_List : Elist_Id;
5423 New_Subp : Entity_Id := Empty;
5427 pragma Assert (Ada_Version >= Ada_05
5428 and then Is_Record_Type (Tagged_Type)
5429 and then Is_Tagged_Type (Tagged_Type)
5430 and then Has_Interfaces (Tagged_Type)
5431 and then not Is_Interface (Tagged_Type));
5433 Collect_Interfaces (Tagged_Type, Ifaces_List);
5435 Iface_Elmt := First_Elmt (Ifaces_List);
5436 while Present (Iface_Elmt) loop
5437 Iface := Node (Iface_Elmt);
5439 -- Exclude from this processing interfaces that are parents
5440 -- of Tagged_Type because their primitives are located in the
5441 -- primary dispatch table (and hence no auxiliary internal
5442 -- entities are required to handle secondary dispatch tables
5445 if not Is_Ancestor (Iface, Tagged_Type) then
5446 Elmt := First_Elmt (Primitive_Operations (Iface));
5447 while Present (Elmt) loop
5448 Iface_Prim := Node (Elmt);
5450 if not Is_Predefined_Dispatching_Operation (Iface_Prim) then
5452 Find_Primitive_Covering_Interface
5453 (Tagged_Type => Tagged_Type,
5454 Iface_Prim => Iface_Prim);
5456 pragma Assert (Present (Prim));
5459 (New_Subp => New_Subp,
5460 Parent_Subp => Iface_Prim,
5461 Derived_Type => Tagged_Type,
5462 Parent_Type => Iface);
5464 -- Ada 2005 (AI-251): Decorate internal entity Iface_Subp
5465 -- associated with interface types. These entities are
5466 -- only registered in the list of primitives of its
5467 -- corresponding tagged type because they are only used
5468 -- to fill the contents of the secondary dispatch tables.
5469 -- Therefore they are removed from the homonym chains.
5471 Set_Is_Hidden (New_Subp);
5472 Set_Is_Internal (New_Subp);
5473 Set_Alias (New_Subp, Prim);
5474 Set_Is_Abstract_Subprogram (New_Subp,
5475 Is_Abstract_Subprogram (Prim));
5476 Set_Interface_Alias (New_Subp, Iface_Prim);
5478 -- Internal entities associated with interface types are
5479 -- only registered in the list of primitives of the
5480 -- tagged type. They are only used to fill the contents
5481 -- of the secondary dispatch tables. Therefore they are
5482 -- not needed in the homonym chains.
5484 Remove_Homonym (New_Subp);
5486 -- Hidden entities associated with interfaces must have
5487 -- set the Has_Delay_Freeze attribute to ensure that, in
5488 -- case of locally defined tagged types (or compiling
5489 -- with static dispatch tables generation disabled) the
5490 -- corresponding entry of the secondary dispatch table is
5491 -- filled when such entity is frozen.
5493 Set_Has_Delayed_Freeze (New_Subp);
5500 Next_Elmt (Iface_Elmt);
5502 end Add_Internal_Interface_Entities;
5506 Def_Id : constant Node_Id := Entity (N);
5507 Type_Decl : constant Node_Id := Parent (Def_Id);
5509 Comp_Typ : Entity_Id;
5510 Has_Static_DT : Boolean := False;
5511 Predef_List : List_Id;
5513 Flist : Entity_Id := Empty;
5514 -- Finalization list allocated for the case of a type with anonymous
5515 -- access components whose designated type is potentially controlled.
5517 Renamed_Eq : Node_Id := Empty;
5518 -- Defining unit name for the predefined equality function in the case
5519 -- where the type has a primitive operation that is a renaming of
5520 -- predefined equality (but only if there is also an overriding
5521 -- user-defined equality function). Used to pass this entity from
5522 -- Make_Predefined_Primitive_Specs to Predefined_Primitive_Bodies.
5524 Wrapper_Decl_List : List_Id := No_List;
5525 Wrapper_Body_List : List_Id := No_List;
5526 Null_Proc_Decl_List : List_Id := No_List;
5528 -- Start of processing for Freeze_Record_Type
5531 -- Build discriminant checking functions if not a derived type (for
5532 -- derived types that are not tagged types, always use the discriminant
5533 -- checking functions of the parent type). However, for untagged types
5534 -- the derivation may have taken place before the parent was frozen, so
5535 -- we copy explicitly the discriminant checking functions from the
5536 -- parent into the components of the derived type.
5538 if not Is_Derived_Type (Def_Id)
5539 or else Has_New_Non_Standard_Rep (Def_Id)
5540 or else Is_Tagged_Type (Def_Id)
5542 Build_Discr_Checking_Funcs (Type_Decl);
5544 elsif Is_Derived_Type (Def_Id)
5545 and then not Is_Tagged_Type (Def_Id)
5547 -- If we have a derived Unchecked_Union, we do not inherit the
5548 -- discriminant checking functions from the parent type since the
5549 -- discriminants are non existent.
5551 and then not Is_Unchecked_Union (Def_Id)
5552 and then Has_Discriminants (Def_Id)
5555 Old_Comp : Entity_Id;
5559 First_Component (Base_Type (Underlying_Type (Etype (Def_Id))));
5560 Comp := First_Component (Def_Id);
5561 while Present (Comp) loop
5562 if Ekind (Comp) = E_Component
5563 and then Chars (Comp) = Chars (Old_Comp)
5565 Set_Discriminant_Checking_Func (Comp,
5566 Discriminant_Checking_Func (Old_Comp));
5569 Next_Component (Old_Comp);
5570 Next_Component (Comp);
5575 if Is_Derived_Type (Def_Id)
5576 and then Is_Limited_Type (Def_Id)
5577 and then Is_Tagged_Type (Def_Id)
5579 Check_Stream_Attributes (Def_Id);
5582 -- Update task and controlled component flags, because some of the
5583 -- component types may have been private at the point of the record
5586 Comp := First_Component (Def_Id);
5588 while Present (Comp) loop
5589 Comp_Typ := Etype (Comp);
5591 if Has_Task (Comp_Typ) then
5592 Set_Has_Task (Def_Id);
5594 elsif Has_Controlled_Component (Comp_Typ)
5595 or else (Chars (Comp) /= Name_uParent
5596 and then Is_Controlled (Comp_Typ))
5598 Set_Has_Controlled_Component (Def_Id);
5600 elsif Ekind (Comp_Typ) = E_Anonymous_Access_Type
5601 and then Needs_Finalization (Directly_Designated_Type (Comp_Typ))
5604 Flist := Add_Final_Chain (Def_Id);
5607 Set_Associated_Final_Chain (Comp_Typ, Flist);
5610 Next_Component (Comp);
5613 -- Creation of the Dispatch Table. Note that a Dispatch Table is built
5614 -- for regular tagged types as well as for Ada types deriving from a C++
5615 -- Class, but not for tagged types directly corresponding to C++ classes
5616 -- In the later case we assume that it is created in the C++ side and we
5619 if Is_Tagged_Type (Def_Id) then
5621 Static_Dispatch_Tables
5622 and then Is_Library_Level_Tagged_Type (Def_Id);
5624 -- Add the _Tag component
5626 if Underlying_Type (Etype (Def_Id)) = Def_Id then
5627 Expand_Tagged_Root (Def_Id);
5630 if Is_CPP_Class (Def_Id) then
5631 Set_All_DT_Position (Def_Id);
5632 Set_Default_Constructor (Def_Id);
5634 -- Create the tag entities with a minimum decoration
5636 if VM_Target = No_VM then
5637 Append_Freeze_Actions (Def_Id, Make_Tags (Def_Id));
5641 if not Has_Static_DT then
5643 -- Usually inherited primitives are not delayed but the first
5644 -- Ada extension of a CPP_Class is an exception since the
5645 -- address of the inherited subprogram has to be inserted in
5646 -- the new Ada Dispatch Table and this is a freezing action.
5648 -- Similarly, if this is an inherited operation whose parent is
5649 -- not frozen yet, it is not in the DT of the parent, and we
5650 -- generate an explicit freeze node for the inherited operation
5651 -- so that it is properly inserted in the DT of the current
5655 Elmt : Elmt_Id := First_Elmt (Primitive_Operations (Def_Id));
5659 while Present (Elmt) loop
5660 Subp := Node (Elmt);
5662 if Present (Alias (Subp)) then
5663 if Is_CPP_Class (Etype (Def_Id)) then
5664 Set_Has_Delayed_Freeze (Subp);
5666 elsif Has_Delayed_Freeze (Alias (Subp))
5667 and then not Is_Frozen (Alias (Subp))
5669 Set_Is_Frozen (Subp, False);
5670 Set_Has_Delayed_Freeze (Subp);
5679 -- Unfreeze momentarily the type to add the predefined primitives
5680 -- operations. The reason we unfreeze is so that these predefined
5681 -- operations will indeed end up as primitive operations (which
5682 -- must be before the freeze point).
5684 Set_Is_Frozen (Def_Id, False);
5686 -- Do not add the spec of predefined primitives in case of
5687 -- CPP tagged type derivations that have convention CPP.
5689 if Is_CPP_Class (Root_Type (Def_Id))
5690 and then Convention (Def_Id) = Convention_CPP
5694 -- Do not add the spec of the predefined primitives if we are
5695 -- compiling under restriction No_Dispatching_Calls
5697 elsif not Restriction_Active (No_Dispatching_Calls) then
5698 Make_Predefined_Primitive_Specs
5699 (Def_Id, Predef_List, Renamed_Eq);
5700 Insert_List_Before_And_Analyze (N, Predef_List);
5703 -- Ada 2005 (AI-391): For a nonabstract null extension, create
5704 -- wrapper functions for each nonoverridden inherited function
5705 -- with a controlling result of the type. The wrapper for such
5706 -- a function returns an extension aggregate that invokes the
5707 -- the parent function.
5709 if Ada_Version >= Ada_05
5710 and then not Is_Abstract_Type (Def_Id)
5711 and then Is_Null_Extension (Def_Id)
5713 Make_Controlling_Function_Wrappers
5714 (Def_Id, Wrapper_Decl_List, Wrapper_Body_List);
5715 Insert_List_Before_And_Analyze (N, Wrapper_Decl_List);
5718 -- Ada 2005 (AI-251): For a nonabstract type extension, build
5719 -- null procedure declarations for each set of homographic null
5720 -- procedures that are inherited from interface types but not
5721 -- overridden. This is done to ensure that the dispatch table
5722 -- entry associated with such null primitives are properly filled.
5724 if Ada_Version >= Ada_05
5725 and then Etype (Def_Id) /= Def_Id
5726 and then not Is_Abstract_Type (Def_Id)
5728 Make_Null_Procedure_Specs (Def_Id, Null_Proc_Decl_List);
5729 Insert_Actions (N, Null_Proc_Decl_List);
5732 -- Ada 2005 (AI-251): Add internal entities associated with
5733 -- secondary dispatch tables to the list of primitives of tagged
5734 -- types that are not interfaces
5736 if Ada_Version >= Ada_05
5737 and then not Is_Interface (Def_Id)
5738 and then Has_Interfaces (Def_Id)
5740 Add_Internal_Interface_Entities (Def_Id);
5743 Set_Is_Frozen (Def_Id);
5744 Set_All_DT_Position (Def_Id);
5746 -- Add the controlled component before the freezing actions
5747 -- referenced in those actions.
5749 if Has_New_Controlled_Component (Def_Id) then
5750 Expand_Record_Controller (Def_Id);
5753 -- Create and decorate the tags. Suppress their creation when
5754 -- VM_Target because the dispatching mechanism is handled
5755 -- internally by the VMs.
5757 if VM_Target = No_VM then
5758 Append_Freeze_Actions (Def_Id, Make_Tags (Def_Id));
5760 -- Generate dispatch table of locally defined tagged type.
5761 -- Dispatch tables of library level tagged types are built
5762 -- later (see Analyze_Declarations).
5764 if VM_Target = No_VM
5765 and then not Has_Static_DT
5767 Append_Freeze_Actions (Def_Id, Make_DT (Def_Id));
5771 -- If the type has unknown discriminants, propagate dispatching
5772 -- information to its underlying record view, which does not get
5773 -- its own dispatch table.
5775 if Is_Derived_Type (Def_Id)
5776 and then Has_Unknown_Discriminants (Def_Id)
5777 and then Present (Underlying_Record_View (Def_Id))
5780 Rep : constant Entity_Id :=
5781 Underlying_Record_View (Def_Id);
5783 Set_Access_Disp_Table
5784 (Rep, Access_Disp_Table (Def_Id));
5785 Set_Dispatch_Table_Wrappers
5786 (Rep, Dispatch_Table_Wrappers (Def_Id));
5787 Set_Primitive_Operations
5788 (Rep, Primitive_Operations (Def_Id));
5792 -- Make sure that the primitives Initialize, Adjust and Finalize
5793 -- are Frozen before other TSS subprograms. We don't want them
5796 if Is_Controlled (Def_Id) then
5797 if not Is_Limited_Type (Def_Id) then
5798 Append_Freeze_Actions (Def_Id,
5800 (Find_Prim_Op (Def_Id, Name_Adjust), Sloc (Def_Id)));
5803 Append_Freeze_Actions (Def_Id,
5805 (Find_Prim_Op (Def_Id, Name_Initialize), Sloc (Def_Id)));
5807 Append_Freeze_Actions (Def_Id,
5809 (Find_Prim_Op (Def_Id, Name_Finalize), Sloc (Def_Id)));
5812 -- Freeze rest of primitive operations. There is no need to handle
5813 -- the predefined primitives if we are compiling under restriction
5814 -- No_Dispatching_Calls
5816 if not Restriction_Active (No_Dispatching_Calls) then
5817 Append_Freeze_Actions
5818 (Def_Id, Predefined_Primitive_Freeze (Def_Id));
5822 -- In the non-tagged case, an equality function is provided only for
5823 -- variant records (that are not unchecked unions).
5825 elsif Has_Discriminants (Def_Id)
5826 and then not Is_Limited_Type (Def_Id)
5829 Comps : constant Node_Id :=
5830 Component_List (Type_Definition (Type_Decl));
5834 and then Present (Variant_Part (Comps))
5836 Build_Variant_Record_Equality (Def_Id);
5841 -- Before building the record initialization procedure, if we are
5842 -- dealing with a concurrent record value type, then we must go through
5843 -- the discriminants, exchanging discriminals between the concurrent
5844 -- type and the concurrent record value type. See the section "Handling
5845 -- of Discriminants" in the Einfo spec for details.
5847 if Is_Concurrent_Record_Type (Def_Id)
5848 and then Has_Discriminants (Def_Id)
5851 Ctyp : constant Entity_Id :=
5852 Corresponding_Concurrent_Type (Def_Id);
5853 Conc_Discr : Entity_Id;
5854 Rec_Discr : Entity_Id;
5858 Conc_Discr := First_Discriminant (Ctyp);
5859 Rec_Discr := First_Discriminant (Def_Id);
5861 while Present (Conc_Discr) loop
5862 Temp := Discriminal (Conc_Discr);
5863 Set_Discriminal (Conc_Discr, Discriminal (Rec_Discr));
5864 Set_Discriminal (Rec_Discr, Temp);
5866 Set_Discriminal_Link (Discriminal (Conc_Discr), Conc_Discr);
5867 Set_Discriminal_Link (Discriminal (Rec_Discr), Rec_Discr);
5869 Next_Discriminant (Conc_Discr);
5870 Next_Discriminant (Rec_Discr);
5875 if Has_Controlled_Component (Def_Id) then
5876 if No (Controller_Component (Def_Id)) then
5877 Expand_Record_Controller (Def_Id);
5880 Build_Controlling_Procs (Def_Id);
5883 Adjust_Discriminants (Def_Id);
5885 if VM_Target = No_VM or else not Is_Interface (Def_Id) then
5887 -- Do not need init for interfaces on e.g. CIL since they're
5888 -- abstract. Helps operation of peverify (the PE Verify tool).
5890 Build_Record_Init_Proc (Type_Decl, Def_Id);
5893 -- For tagged type that are not interfaces, build bodies of primitive
5894 -- operations. Note that we do this after building the record
5895 -- initialization procedure, since the primitive operations may need
5896 -- the initialization routine. There is no need to add predefined
5897 -- primitives of interfaces because all their predefined primitives
5900 if Is_Tagged_Type (Def_Id)
5901 and then not Is_Interface (Def_Id)
5903 -- Do not add the body of predefined primitives in case of
5904 -- CPP tagged type derivations that have convention CPP.
5906 if Is_CPP_Class (Root_Type (Def_Id))
5907 and then Convention (Def_Id) = Convention_CPP
5911 -- Do not add the body of the predefined primitives if we are
5912 -- compiling under restriction No_Dispatching_Calls or if we are
5913 -- compiling a CPP tagged type.
5915 elsif not Restriction_Active (No_Dispatching_Calls) then
5916 Predef_List := Predefined_Primitive_Bodies (Def_Id, Renamed_Eq);
5917 Append_Freeze_Actions (Def_Id, Predef_List);
5920 -- Ada 2005 (AI-391): If any wrappers were created for nonoverridden
5921 -- inherited functions, then add their bodies to the freeze actions.
5923 if Present (Wrapper_Body_List) then
5924 Append_Freeze_Actions (Def_Id, Wrapper_Body_List);
5927 end Freeze_Record_Type;
5929 ------------------------------
5930 -- Freeze_Stream_Operations --
5931 ------------------------------
5933 procedure Freeze_Stream_Operations (N : Node_Id; Typ : Entity_Id) is
5934 Names : constant array (1 .. 4) of TSS_Name_Type :=
5939 Stream_Op : Entity_Id;
5942 -- Primitive operations of tagged types are frozen when the dispatch
5943 -- table is constructed.
5945 if not Comes_From_Source (Typ)
5946 or else Is_Tagged_Type (Typ)
5951 for J in Names'Range loop
5952 Stream_Op := TSS (Typ, Names (J));
5954 if Present (Stream_Op)
5955 and then Is_Subprogram (Stream_Op)
5956 and then Nkind (Unit_Declaration_Node (Stream_Op)) =
5957 N_Subprogram_Declaration
5958 and then not Is_Frozen (Stream_Op)
5960 Append_Freeze_Actions
5961 (Typ, Freeze_Entity (Stream_Op, Sloc (N)));
5964 end Freeze_Stream_Operations;
5970 -- Full type declarations are expanded at the point at which the type is
5971 -- frozen. The formal N is the Freeze_Node for the type. Any statements or
5972 -- declarations generated by the freezing (e.g. the procedure generated
5973 -- for initialization) are chained in the Actions field list of the freeze
5974 -- node using Append_Freeze_Actions.
5976 function Freeze_Type (N : Node_Id) return Boolean is
5977 Def_Id : constant Entity_Id := Entity (N);
5978 RACW_Seen : Boolean := False;
5979 Result : Boolean := False;
5982 -- Process associated access types needing special processing
5984 if Present (Access_Types_To_Process (N)) then
5986 E : Elmt_Id := First_Elmt (Access_Types_To_Process (N));
5988 while Present (E) loop
5990 if Is_Remote_Access_To_Class_Wide_Type (Node (E)) then
5991 Validate_RACW_Primitives (Node (E));
6001 -- If there are RACWs designating this type, make stubs now
6003 Remote_Types_Tagged_Full_View_Encountered (Def_Id);
6007 -- Freeze processing for record types
6009 if Is_Record_Type (Def_Id) then
6010 if Ekind (Def_Id) = E_Record_Type then
6011 Freeze_Record_Type (N);
6013 -- The subtype may have been declared before the type was frozen. If
6014 -- the type has controlled components it is necessary to create the
6015 -- entity for the controller explicitly because it did not exist at
6016 -- the point of the subtype declaration. Only the entity is needed,
6017 -- the back-end will obtain the layout from the type. This is only
6018 -- necessary if this is constrained subtype whose component list is
6019 -- not shared with the base type.
6021 elsif Ekind (Def_Id) = E_Record_Subtype
6022 and then Has_Discriminants (Def_Id)
6023 and then Last_Entity (Def_Id) /= Last_Entity (Base_Type (Def_Id))
6024 and then Present (Controller_Component (Def_Id))
6027 Old_C : constant Entity_Id := Controller_Component (Def_Id);
6031 if Scope (Old_C) = Base_Type (Def_Id) then
6033 -- The entity is the one in the parent. Create new one
6035 New_C := New_Copy (Old_C);
6036 Set_Parent (New_C, Parent (Old_C));
6037 Push_Scope (Def_Id);
6043 if Is_Itype (Def_Id)
6044 and then Is_Record_Type (Underlying_Type (Scope (Def_Id)))
6046 -- The freeze node is only used to introduce the controller,
6047 -- the back-end has no use for it for a discriminated
6050 Set_Freeze_Node (Def_Id, Empty);
6051 Set_Has_Delayed_Freeze (Def_Id, False);
6055 -- Similar process if the controller of the subtype is not present
6056 -- but the parent has it. This can happen with constrained
6057 -- record components where the subtype is an itype.
6059 elsif Ekind (Def_Id) = E_Record_Subtype
6060 and then Is_Itype (Def_Id)
6061 and then No (Controller_Component (Def_Id))
6062 and then Present (Controller_Component (Etype (Def_Id)))
6065 Old_C : constant Entity_Id :=
6066 Controller_Component (Etype (Def_Id));
6067 New_C : constant Entity_Id := New_Copy (Old_C);
6070 Set_Next_Entity (New_C, First_Entity (Def_Id));
6071 Set_First_Entity (Def_Id, New_C);
6073 -- The freeze node is only used to introduce the controller,
6074 -- the back-end has no use for it for a discriminated
6077 Set_Freeze_Node (Def_Id, Empty);
6078 Set_Has_Delayed_Freeze (Def_Id, False);
6083 -- Freeze processing for array types
6085 elsif Is_Array_Type (Def_Id) then
6086 Freeze_Array_Type (N);
6088 -- Freeze processing for access types
6090 -- For pool-specific access types, find out the pool object used for
6091 -- this type, needs actual expansion of it in some cases. Here are the
6092 -- different cases :
6094 -- 1. Rep Clause "for Def_Id'Storage_Size use 0;"
6095 -- ---> don't use any storage pool
6097 -- 2. Rep Clause : for Def_Id'Storage_Size use Expr.
6099 -- Def_Id__Pool : Stack_Bounded_Pool (Expr, DT'Size, DT'Alignment);
6101 -- 3. Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
6102 -- ---> Storage Pool is the specified one
6104 -- See GNAT Pool packages in the Run-Time for more details
6106 elsif Ekind (Def_Id) = E_Access_Type
6107 or else Ekind (Def_Id) = E_General_Access_Type
6110 Loc : constant Source_Ptr := Sloc (N);
6111 Desig_Type : constant Entity_Id := Designated_Type (Def_Id);
6112 Pool_Object : Entity_Id;
6114 Freeze_Action_Typ : Entity_Id;
6119 -- Rep Clause "for Def_Id'Storage_Size use 0;"
6120 -- ---> don't use any storage pool
6122 if No_Pool_Assigned (Def_Id) then
6127 -- Rep Clause : for Def_Id'Storage_Size use Expr.
6129 -- Def_Id__Pool : Stack_Bounded_Pool
6130 -- (Expr, DT'Size, DT'Alignment);
6132 elsif Has_Storage_Size_Clause (Def_Id) then
6138 -- For unconstrained composite types we give a size of zero
6139 -- so that the pool knows that it needs a special algorithm
6140 -- for variable size object allocation.
6142 if Is_Composite_Type (Desig_Type)
6143 and then not Is_Constrained (Desig_Type)
6146 Make_Integer_Literal (Loc, 0);
6149 Make_Integer_Literal (Loc, Maximum_Alignment);
6153 Make_Attribute_Reference (Loc,
6154 Prefix => New_Reference_To (Desig_Type, Loc),
6155 Attribute_Name => Name_Max_Size_In_Storage_Elements);
6158 Make_Attribute_Reference (Loc,
6159 Prefix => New_Reference_To (Desig_Type, Loc),
6160 Attribute_Name => Name_Alignment);
6164 Make_Defining_Identifier (Loc,
6165 Chars => New_External_Name (Chars (Def_Id), 'P'));
6167 -- We put the code associated with the pools in the entity
6168 -- that has the later freeze node, usually the access type
6169 -- but it can also be the designated_type; because the pool
6170 -- code requires both those types to be frozen
6172 if Is_Frozen (Desig_Type)
6173 and then (No (Freeze_Node (Desig_Type))
6174 or else Analyzed (Freeze_Node (Desig_Type)))
6176 Freeze_Action_Typ := Def_Id;
6178 -- A Taft amendment type cannot get the freeze actions
6179 -- since the full view is not there.
6181 elsif Is_Incomplete_Or_Private_Type (Desig_Type)
6182 and then No (Full_View (Desig_Type))
6184 Freeze_Action_Typ := Def_Id;
6187 Freeze_Action_Typ := Desig_Type;
6190 Append_Freeze_Action (Freeze_Action_Typ,
6191 Make_Object_Declaration (Loc,
6192 Defining_Identifier => Pool_Object,
6193 Object_Definition =>
6194 Make_Subtype_Indication (Loc,
6197 (RTE (RE_Stack_Bounded_Pool), Loc),
6200 Make_Index_Or_Discriminant_Constraint (Loc,
6201 Constraints => New_List (
6203 -- First discriminant is the Pool Size
6206 Storage_Size_Variable (Def_Id), Loc),
6208 -- Second discriminant is the element size
6212 -- Third discriminant is the alignment
6217 Set_Associated_Storage_Pool (Def_Id, Pool_Object);
6221 -- Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
6222 -- ---> Storage Pool is the specified one
6224 elsif Present (Associated_Storage_Pool (Def_Id)) then
6226 -- Nothing to do the associated storage pool has been attached
6227 -- when analyzing the rep. clause
6232 -- For access-to-controlled types (including class-wide types and
6233 -- Taft-amendment types which potentially have controlled
6234 -- components), expand the list controller object that will store
6235 -- the dynamically allocated objects. Do not do this
6236 -- transformation for expander-generated access types, but do it
6237 -- for types that are the full view of types derived from other
6238 -- private types. Also suppress the list controller in the case
6239 -- of a designated type with convention Java, since this is used
6240 -- when binding to Java API specs, where there's no equivalent of
6241 -- a finalization list and we don't want to pull in the
6242 -- finalization support if not needed.
6244 if not Comes_From_Source (Def_Id)
6245 and then not Has_Private_Declaration (Def_Id)
6249 elsif (Needs_Finalization (Desig_Type)
6250 and then Convention (Desig_Type) /= Convention_Java
6251 and then Convention (Desig_Type) /= Convention_CIL)
6253 (Is_Incomplete_Or_Private_Type (Desig_Type)
6254 and then No (Full_View (Desig_Type))
6256 -- An exception is made for types defined in the run-time
6257 -- because Ada.Tags.Tag itself is such a type and cannot
6258 -- afford this unnecessary overhead that would generates a
6259 -- loop in the expansion scheme...
6261 and then not In_Runtime (Def_Id)
6263 -- Another exception is if Restrictions (No_Finalization)
6264 -- is active, since then we know nothing is controlled.
6266 and then not Restriction_Active (No_Finalization))
6268 -- If the designated type is not frozen yet, its controlled
6269 -- status must be retrieved explicitly.
6271 or else (Is_Array_Type (Desig_Type)
6272 and then not Is_Frozen (Desig_Type)
6273 and then Needs_Finalization (Component_Type (Desig_Type)))
6275 -- The designated type has controlled anonymous access
6278 or else Has_Controlled_Coextensions (Desig_Type)
6280 Set_Associated_Final_Chain (Def_Id, Add_Final_Chain (Def_Id));
6284 -- Freeze processing for enumeration types
6286 elsif Ekind (Def_Id) = E_Enumeration_Type then
6288 -- We only have something to do if we have a non-standard
6289 -- representation (i.e. at least one literal whose pos value
6290 -- is not the same as its representation)
6292 if Has_Non_Standard_Rep (Def_Id) then
6293 Freeze_Enumeration_Type (N);
6296 -- Private types that are completed by a derivation from a private
6297 -- type have an internally generated full view, that needs to be
6298 -- frozen. This must be done explicitly because the two views share
6299 -- the freeze node, and the underlying full view is not visible when
6300 -- the freeze node is analyzed.
6302 elsif Is_Private_Type (Def_Id)
6303 and then Is_Derived_Type (Def_Id)
6304 and then Present (Full_View (Def_Id))
6305 and then Is_Itype (Full_View (Def_Id))
6306 and then Has_Private_Declaration (Full_View (Def_Id))
6307 and then Freeze_Node (Full_View (Def_Id)) = N
6309 Set_Entity (N, Full_View (Def_Id));
6310 Result := Freeze_Type (N);
6311 Set_Entity (N, Def_Id);
6313 -- All other types require no expander action. There are such cases
6314 -- (e.g. task types and protected types). In such cases, the freeze
6315 -- nodes are there for use by Gigi.
6319 Freeze_Stream_Operations (N, Def_Id);
6323 when RE_Not_Available =>
6327 -------------------------
6328 -- Get_Simple_Init_Val --
6329 -------------------------
6331 function Get_Simple_Init_Val
6334 Size : Uint := No_Uint) return Node_Id
6336 Loc : constant Source_Ptr := Sloc (N);
6342 -- This is the size to be used for computation of the appropriate
6343 -- initial value for the Normalize_Scalars and Initialize_Scalars case.
6345 IV_Attribute : constant Boolean :=
6346 Nkind (N) = N_Attribute_Reference
6347 and then Attribute_Name (N) = Name_Invalid_Value;
6351 -- These are the values computed by the procedure Check_Subtype_Bounds
6353 procedure Check_Subtype_Bounds;
6354 -- This procedure examines the subtype T, and its ancestor subtypes and
6355 -- derived types to determine the best known information about the
6356 -- bounds of the subtype. After the call Lo_Bound is set either to
6357 -- No_Uint if no information can be determined, or to a value which
6358 -- represents a known low bound, i.e. a valid value of the subtype can
6359 -- not be less than this value. Hi_Bound is similarly set to a known
6360 -- high bound (valid value cannot be greater than this).
6362 --------------------------
6363 -- Check_Subtype_Bounds --
6364 --------------------------
6366 procedure Check_Subtype_Bounds is
6375 Lo_Bound := No_Uint;
6376 Hi_Bound := No_Uint;
6378 -- Loop to climb ancestor subtypes and derived types
6382 if not Is_Discrete_Type (ST1) then
6386 Lo := Type_Low_Bound (ST1);
6387 Hi := Type_High_Bound (ST1);
6389 if Compile_Time_Known_Value (Lo) then
6390 Loval := Expr_Value (Lo);
6392 if Lo_Bound = No_Uint or else Lo_Bound < Loval then
6397 if Compile_Time_Known_Value (Hi) then
6398 Hival := Expr_Value (Hi);
6400 if Hi_Bound = No_Uint or else Hi_Bound > Hival then
6405 ST2 := Ancestor_Subtype (ST1);
6411 exit when ST1 = ST2;
6414 end Check_Subtype_Bounds;
6416 -- Start of processing for Get_Simple_Init_Val
6419 -- For a private type, we should always have an underlying type
6420 -- (because this was already checked in Needs_Simple_Initialization).
6421 -- What we do is to get the value for the underlying type and then do
6422 -- an Unchecked_Convert to the private type.
6424 if Is_Private_Type (T) then
6425 Val := Get_Simple_Init_Val (Underlying_Type (T), N, Size);
6427 -- A special case, if the underlying value is null, then qualify it
6428 -- with the underlying type, so that the null is properly typed
6429 -- Similarly, if it is an aggregate it must be qualified, because an
6430 -- unchecked conversion does not provide a context for it.
6432 if Nkind_In (Val, N_Null, N_Aggregate) then
6434 Make_Qualified_Expression (Loc,
6436 New_Occurrence_Of (Underlying_Type (T), Loc),
6440 Result := Unchecked_Convert_To (T, Val);
6442 -- Don't truncate result (important for Initialize/Normalize_Scalars)
6444 if Nkind (Result) = N_Unchecked_Type_Conversion
6445 and then Is_Scalar_Type (Underlying_Type (T))
6447 Set_No_Truncation (Result);
6452 -- For scalars, we must have normalize/initialize scalars case, or
6453 -- if the node N is an 'Invalid_Value attribute node.
6455 elsif Is_Scalar_Type (T) then
6456 pragma Assert (Init_Or_Norm_Scalars or IV_Attribute);
6458 -- Compute size of object. If it is given by the caller, we can use
6459 -- it directly, otherwise we use Esize (T) as an estimate. As far as
6460 -- we know this covers all cases correctly.
6462 if Size = No_Uint or else Size <= Uint_0 then
6463 Size_To_Use := UI_Max (Uint_1, Esize (T));
6465 Size_To_Use := Size;
6468 -- Maximum size to use is 64 bits, since we will create values
6469 -- of type Unsigned_64 and the range must fit this type.
6471 if Size_To_Use /= No_Uint and then Size_To_Use > Uint_64 then
6472 Size_To_Use := Uint_64;
6475 -- Check known bounds of subtype
6477 Check_Subtype_Bounds;
6479 -- Processing for Normalize_Scalars case
6481 if Normalize_Scalars and then not IV_Attribute then
6483 -- If zero is invalid, it is a convenient value to use that is
6484 -- for sure an appropriate invalid value in all situations.
6486 if Lo_Bound /= No_Uint and then Lo_Bound > Uint_0 then
6487 Val := Make_Integer_Literal (Loc, 0);
6489 -- Cases where all one bits is the appropriate invalid value
6491 -- For modular types, all 1 bits is either invalid or valid. If
6492 -- it is valid, then there is nothing that can be done since there
6493 -- are no invalid values (we ruled out zero already).
6495 -- For signed integer types that have no negative values, either
6496 -- there is room for negative values, or there is not. If there
6497 -- is, then all 1 bits may be interpreted as minus one, which is
6498 -- certainly invalid. Alternatively it is treated as the largest
6499 -- positive value, in which case the observation for modular types
6502 -- For float types, all 1-bits is a NaN (not a number), which is
6503 -- certainly an appropriately invalid value.
6505 elsif Is_Unsigned_Type (T)
6506 or else Is_Floating_Point_Type (T)
6507 or else Is_Enumeration_Type (T)
6509 Val := Make_Integer_Literal (Loc, 2 ** Size_To_Use - 1);
6511 -- Resolve as Unsigned_64, because the largest number we
6512 -- can generate is out of range of universal integer.
6514 Analyze_And_Resolve (Val, RTE (RE_Unsigned_64));
6516 -- Case of signed types
6520 Signed_Size : constant Uint :=
6521 UI_Min (Uint_63, Size_To_Use - 1);
6524 -- Normally we like to use the most negative number. The
6525 -- one exception is when this number is in the known
6526 -- subtype range and the largest positive number is not in
6527 -- the known subtype range.
6529 -- For this exceptional case, use largest positive value
6531 if Lo_Bound /= No_Uint and then Hi_Bound /= No_Uint
6532 and then Lo_Bound <= (-(2 ** Signed_Size))
6533 and then Hi_Bound < 2 ** Signed_Size
6535 Val := Make_Integer_Literal (Loc, 2 ** Signed_Size - 1);
6537 -- Normal case of largest negative value
6540 Val := Make_Integer_Literal (Loc, -(2 ** Signed_Size));
6545 -- Here for Initialize_Scalars case (or Invalid_Value attribute used)
6548 -- For float types, use float values from System.Scalar_Values
6550 if Is_Floating_Point_Type (T) then
6551 if Root_Type (T) = Standard_Short_Float then
6552 Val_RE := RE_IS_Isf;
6553 elsif Root_Type (T) = Standard_Float then
6554 Val_RE := RE_IS_Ifl;
6555 elsif Root_Type (T) = Standard_Long_Float then
6556 Val_RE := RE_IS_Ilf;
6557 else pragma Assert (Root_Type (T) = Standard_Long_Long_Float);
6558 Val_RE := RE_IS_Ill;
6561 -- If zero is invalid, use zero values from System.Scalar_Values
6563 elsif Lo_Bound /= No_Uint and then Lo_Bound > Uint_0 then
6564 if Size_To_Use <= 8 then
6565 Val_RE := RE_IS_Iz1;
6566 elsif Size_To_Use <= 16 then
6567 Val_RE := RE_IS_Iz2;
6568 elsif Size_To_Use <= 32 then
6569 Val_RE := RE_IS_Iz4;
6571 Val_RE := RE_IS_Iz8;
6574 -- For unsigned, use unsigned values from System.Scalar_Values
6576 elsif Is_Unsigned_Type (T) then
6577 if Size_To_Use <= 8 then
6578 Val_RE := RE_IS_Iu1;
6579 elsif Size_To_Use <= 16 then
6580 Val_RE := RE_IS_Iu2;
6581 elsif Size_To_Use <= 32 then
6582 Val_RE := RE_IS_Iu4;
6584 Val_RE := RE_IS_Iu8;
6587 -- For signed, use signed values from System.Scalar_Values
6590 if Size_To_Use <= 8 then
6591 Val_RE := RE_IS_Is1;
6592 elsif Size_To_Use <= 16 then
6593 Val_RE := RE_IS_Is2;
6594 elsif Size_To_Use <= 32 then
6595 Val_RE := RE_IS_Is4;
6597 Val_RE := RE_IS_Is8;
6601 Val := New_Occurrence_Of (RTE (Val_RE), Loc);
6604 -- The final expression is obtained by doing an unchecked conversion
6605 -- of this result to the base type of the required subtype. We use
6606 -- the base type to avoid the unchecked conversion from chopping
6607 -- bits, and then we set Kill_Range_Check to preserve the "bad"
6610 Result := Unchecked_Convert_To (Base_Type (T), Val);
6612 -- Ensure result is not truncated, since we want the "bad" bits
6613 -- and also kill range check on result.
6615 if Nkind (Result) = N_Unchecked_Type_Conversion then
6616 Set_No_Truncation (Result);
6617 Set_Kill_Range_Check (Result, True);
6622 -- String or Wide_[Wide]_String (must have Initialize_Scalars set)
6624 elsif Root_Type (T) = Standard_String
6626 Root_Type (T) = Standard_Wide_String
6628 Root_Type (T) = Standard_Wide_Wide_String
6630 pragma Assert (Init_Or_Norm_Scalars);
6633 Make_Aggregate (Loc,
6634 Component_Associations => New_List (
6635 Make_Component_Association (Loc,
6636 Choices => New_List (
6637 Make_Others_Choice (Loc)),
6640 (Component_Type (T), N, Esize (Root_Type (T))))));
6642 -- Access type is initialized to null
6644 elsif Is_Access_Type (T) then
6648 -- No other possibilities should arise, since we should only be
6649 -- calling Get_Simple_Init_Val if Needs_Simple_Initialization
6650 -- returned True, indicating one of the above cases held.
6653 raise Program_Error;
6657 when RE_Not_Available =>
6659 end Get_Simple_Init_Val;
6661 ------------------------------
6662 -- Has_New_Non_Standard_Rep --
6663 ------------------------------
6665 function Has_New_Non_Standard_Rep (T : Entity_Id) return Boolean is
6667 if not Is_Derived_Type (T) then
6668 return Has_Non_Standard_Rep (T)
6669 or else Has_Non_Standard_Rep (Root_Type (T));
6671 -- If Has_Non_Standard_Rep is not set on the derived type, the
6672 -- representation is fully inherited.
6674 elsif not Has_Non_Standard_Rep (T) then
6678 return First_Rep_Item (T) /= First_Rep_Item (Root_Type (T));
6680 -- May need a more precise check here: the First_Rep_Item may
6681 -- be a stream attribute, which does not affect the representation
6684 end Has_New_Non_Standard_Rep;
6690 function In_Runtime (E : Entity_Id) return Boolean is
6695 while Scope (S1) /= Standard_Standard loop
6699 return Chars (S1) = Name_System or else Chars (S1) = Name_Ada;
6702 ----------------------------
6703 -- Initialization_Warning --
6704 ----------------------------
6706 procedure Initialization_Warning (E : Entity_Id) is
6707 Warning_Needed : Boolean;
6710 Warning_Needed := False;
6712 if Ekind (Current_Scope) = E_Package
6713 and then Static_Elaboration_Desired (Current_Scope)
6716 if Is_Record_Type (E) then
6717 if Has_Discriminants (E)
6718 or else Is_Limited_Type (E)
6719 or else Has_Non_Standard_Rep (E)
6721 Warning_Needed := True;
6724 -- Verify that at least one component has an initialization
6725 -- expression. No need for a warning on a type if all its
6726 -- components have no initialization.
6732 Comp := First_Component (E);
6733 while Present (Comp) loop
6734 if Ekind (Comp) = E_Discriminant
6736 (Nkind (Parent (Comp)) = N_Component_Declaration
6737 and then Present (Expression (Parent (Comp))))
6739 Warning_Needed := True;
6743 Next_Component (Comp);
6748 if Warning_Needed then
6750 ("Objects of the type cannot be initialized " &
6751 "statically by default?",
6757 Error_Msg_N ("Object cannot be initialized statically?", E);
6760 end Initialization_Warning;
6766 function Init_Formals (Typ : Entity_Id) return List_Id is
6767 Loc : constant Source_Ptr := Sloc (Typ);
6771 -- First parameter is always _Init : in out typ. Note that we need
6772 -- this to be in/out because in the case of the task record value,
6773 -- there are default record fields (_Priority, _Size, -Task_Info)
6774 -- that may be referenced in the generated initialization routine.
6776 Formals := New_List (
6777 Make_Parameter_Specification (Loc,
6778 Defining_Identifier =>
6779 Make_Defining_Identifier (Loc, Name_uInit),
6781 Out_Present => True,
6782 Parameter_Type => New_Reference_To (Typ, Loc)));
6784 -- For task record value, or type that contains tasks, add two more
6785 -- formals, _Master : Master_Id and _Chain : in out Activation_Chain
6786 -- We also add these parameters for the task record type case.
6789 or else (Is_Record_Type (Typ) and then Is_Task_Record_Type (Typ))
6792 Make_Parameter_Specification (Loc,
6793 Defining_Identifier =>
6794 Make_Defining_Identifier (Loc, Name_uMaster),
6795 Parameter_Type => New_Reference_To (RTE (RE_Master_Id), Loc)));
6798 Make_Parameter_Specification (Loc,
6799 Defining_Identifier =>
6800 Make_Defining_Identifier (Loc, Name_uChain),
6802 Out_Present => True,
6804 New_Reference_To (RTE (RE_Activation_Chain), Loc)));
6807 Make_Parameter_Specification (Loc,
6808 Defining_Identifier =>
6809 Make_Defining_Identifier (Loc, Name_uTask_Name),
6812 New_Reference_To (Standard_String, Loc)));
6818 when RE_Not_Available =>
6822 -------------------------
6823 -- Init_Secondary_Tags --
6824 -------------------------
6826 procedure Init_Secondary_Tags
6829 Stmts_List : List_Id;
6830 Fixed_Comps : Boolean := True;
6831 Variable_Comps : Boolean := True)
6833 Loc : constant Source_Ptr := Sloc (Target);
6835 procedure Inherit_CPP_Tag
6838 Tag_Comp : Entity_Id;
6839 Iface_Tag : Node_Id);
6840 -- Inherit the C++ tag of the secondary dispatch table of Typ associated
6841 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6843 procedure Initialize_Tag
6846 Tag_Comp : Entity_Id;
6847 Iface_Tag : Node_Id);
6848 -- Initialize the tag of the secondary dispatch table of Typ associated
6849 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6850 -- Compiling under the CPP full ABI compatibility mode, if the ancestor
6851 -- of Typ CPP tagged type we generate code to inherit the contents of
6852 -- the dispatch table directly from the ancestor.
6854 ---------------------
6855 -- Inherit_CPP_Tag --
6856 ---------------------
6858 procedure Inherit_CPP_Tag
6861 Tag_Comp : Entity_Id;
6862 Iface_Tag : Node_Id)
6865 pragma Assert (Is_CPP_Class (Etype (Typ)));
6867 Append_To (Stmts_List,
6868 Build_Inherit_Prims (Loc,
6871 Make_Selected_Component (Loc,
6872 Prefix => New_Copy_Tree (Target),
6873 Selector_Name => New_Reference_To (Tag_Comp, Loc)),
6875 New_Reference_To (Iface_Tag, Loc),
6877 UI_To_Int (DT_Entry_Count (First_Tag_Component (Iface)))));
6878 end Inherit_CPP_Tag;
6880 --------------------
6881 -- Initialize_Tag --
6882 --------------------
6884 procedure Initialize_Tag
6887 Tag_Comp : Entity_Id;
6888 Iface_Tag : Node_Id)
6890 Comp_Typ : Entity_Id;
6891 Offset_To_Top_Comp : Entity_Id := Empty;
6894 -- Initialize the pointer to the secondary DT associated with the
6897 if not Is_Ancestor (Iface, Typ) then
6898 Append_To (Stmts_List,
6899 Make_Assignment_Statement (Loc,
6901 Make_Selected_Component (Loc,
6902 Prefix => New_Copy_Tree (Target),
6903 Selector_Name => New_Reference_To (Tag_Comp, Loc)),
6905 New_Reference_To (Iface_Tag, Loc)));
6908 Comp_Typ := Scope (Tag_Comp);
6910 -- Initialize the entries of the table of interfaces. We generate a
6911 -- different call when the parent of the type has variable size
6914 if Comp_Typ /= Etype (Comp_Typ)
6915 and then Is_Variable_Size_Record (Etype (Comp_Typ))
6916 and then Chars (Tag_Comp) /= Name_uTag
6918 pragma Assert (Present (DT_Offset_To_Top_Func (Tag_Comp)));
6920 -- Issue error if Set_Dynamic_Offset_To_Top is not available in a
6921 -- configurable run-time environment.
6923 if not RTE_Available (RE_Set_Dynamic_Offset_To_Top) then
6925 ("variable size record with interface types", Typ);
6930 -- Set_Dynamic_Offset_To_Top
6932 -- Interface_T => Iface'Tag,
6933 -- Offset_Value => n,
6934 -- Offset_Func => Fn'Address)
6936 Append_To (Stmts_List,
6937 Make_Procedure_Call_Statement (Loc,
6938 Name => New_Reference_To
6939 (RTE (RE_Set_Dynamic_Offset_To_Top), Loc),
6940 Parameter_Associations => New_List (
6941 Make_Attribute_Reference (Loc,
6942 Prefix => New_Copy_Tree (Target),
6943 Attribute_Name => Name_Address),
6945 Unchecked_Convert_To (RTE (RE_Tag),
6947 (Node (First_Elmt (Access_Disp_Table (Iface))),
6950 Unchecked_Convert_To
6951 (RTE (RE_Storage_Offset),
6952 Make_Attribute_Reference (Loc,
6954 Make_Selected_Component (Loc,
6955 Prefix => New_Copy_Tree (Target),
6957 New_Reference_To (Tag_Comp, Loc)),
6958 Attribute_Name => Name_Position)),
6960 Unchecked_Convert_To (RTE (RE_Offset_To_Top_Function_Ptr),
6961 Make_Attribute_Reference (Loc,
6962 Prefix => New_Reference_To
6963 (DT_Offset_To_Top_Func (Tag_Comp), Loc),
6964 Attribute_Name => Name_Address)))));
6966 -- In this case the next component stores the value of the
6967 -- offset to the top.
6969 Offset_To_Top_Comp := Next_Entity (Tag_Comp);
6970 pragma Assert (Present (Offset_To_Top_Comp));
6972 Append_To (Stmts_List,
6973 Make_Assignment_Statement (Loc,
6975 Make_Selected_Component (Loc,
6976 Prefix => New_Copy_Tree (Target),
6977 Selector_Name => New_Reference_To
6978 (Offset_To_Top_Comp, Loc)),
6980 Make_Attribute_Reference (Loc,
6982 Make_Selected_Component (Loc,
6983 Prefix => New_Copy_Tree (Target),
6985 New_Reference_To (Tag_Comp, Loc)),
6986 Attribute_Name => Name_Position)));
6988 -- Normal case: No discriminants in the parent type
6991 -- Don't need to set any value if this interface shares
6992 -- the primary dispatch table.
6994 if not Is_Ancestor (Iface, Typ) then
6995 Append_To (Stmts_List,
6996 Build_Set_Static_Offset_To_Top (Loc,
6997 Iface_Tag => New_Reference_To (Iface_Tag, Loc),
6999 Unchecked_Convert_To (RTE (RE_Storage_Offset),
7000 Make_Attribute_Reference (Loc,
7002 Make_Selected_Component (Loc,
7003 Prefix => New_Copy_Tree (Target),
7005 New_Reference_To (Tag_Comp, Loc)),
7006 Attribute_Name => Name_Position))));
7010 -- Register_Interface_Offset
7012 -- Interface_T => Iface'Tag,
7013 -- Is_Constant => True,
7014 -- Offset_Value => n,
7015 -- Offset_Func => null);
7017 if RTE_Available (RE_Register_Interface_Offset) then
7018 Append_To (Stmts_List,
7019 Make_Procedure_Call_Statement (Loc,
7020 Name => New_Reference_To
7021 (RTE (RE_Register_Interface_Offset), Loc),
7022 Parameter_Associations => New_List (
7023 Make_Attribute_Reference (Loc,
7024 Prefix => New_Copy_Tree (Target),
7025 Attribute_Name => Name_Address),
7027 Unchecked_Convert_To (RTE (RE_Tag),
7029 (Node (First_Elmt (Access_Disp_Table (Iface))), Loc)),
7031 New_Occurrence_Of (Standard_True, Loc),
7033 Unchecked_Convert_To
7034 (RTE (RE_Storage_Offset),
7035 Make_Attribute_Reference (Loc,
7037 Make_Selected_Component (Loc,
7038 Prefix => New_Copy_Tree (Target),
7040 New_Reference_To (Tag_Comp, Loc)),
7041 Attribute_Name => Name_Position)),
7050 Full_Typ : Entity_Id;
7051 Ifaces_List : Elist_Id;
7052 Ifaces_Comp_List : Elist_Id;
7053 Ifaces_Tag_List : Elist_Id;
7054 Iface_Elmt : Elmt_Id;
7055 Iface_Comp_Elmt : Elmt_Id;
7056 Iface_Tag_Elmt : Elmt_Id;
7058 In_Variable_Pos : Boolean;
7060 -- Start of processing for Init_Secondary_Tags
7063 -- Handle private types
7065 if Present (Full_View (Typ)) then
7066 Full_Typ := Full_View (Typ);
7071 Collect_Interfaces_Info
7072 (Full_Typ, Ifaces_List, Ifaces_Comp_List, Ifaces_Tag_List);
7074 Iface_Elmt := First_Elmt (Ifaces_List);
7075 Iface_Comp_Elmt := First_Elmt (Ifaces_Comp_List);
7076 Iface_Tag_Elmt := First_Elmt (Ifaces_Tag_List);
7077 while Present (Iface_Elmt) loop
7078 Tag_Comp := Node (Iface_Comp_Elmt);
7080 -- If we are compiling under the CPP full ABI compatibility mode and
7081 -- the ancestor is a CPP_Pragma tagged type then we generate code to
7082 -- inherit the contents of the dispatch table directly from the
7085 if Is_CPP_Class (Etype (Full_Typ)) then
7086 Inherit_CPP_Tag (Full_Typ,
7087 Iface => Node (Iface_Elmt),
7088 Tag_Comp => Tag_Comp,
7089 Iface_Tag => Node (Iface_Tag_Elmt));
7091 -- Otherwise generate code to initialize the tag
7094 -- Check if the parent of the record type has variable size
7097 In_Variable_Pos := Scope (Tag_Comp) /= Etype (Scope (Tag_Comp))
7098 and then Is_Variable_Size_Record (Etype (Scope (Tag_Comp)));
7100 if (In_Variable_Pos and then Variable_Comps)
7101 or else (not In_Variable_Pos and then Fixed_Comps)
7103 Initialize_Tag (Full_Typ,
7104 Iface => Node (Iface_Elmt),
7105 Tag_Comp => Tag_Comp,
7106 Iface_Tag => Node (Iface_Tag_Elmt));
7110 Next_Elmt (Iface_Elmt);
7111 Next_Elmt (Iface_Comp_Elmt);
7112 Next_Elmt (Iface_Tag_Elmt);
7114 end Init_Secondary_Tags;
7116 -----------------------------
7117 -- Is_Variable_Size_Record --
7118 -----------------------------
7120 function Is_Variable_Size_Record (E : Entity_Id) return Boolean is
7122 Comp_Typ : Entity_Id;
7125 function Is_Constant_Bound (Exp : Node_Id) return Boolean;
7126 -- To simplify handling of array components. Determines whether the
7127 -- given bound is constant (a constant or enumeration literal, or an
7128 -- integer literal) as opposed to per-object, through an expression
7129 -- or a discriminant.
7131 -----------------------
7132 -- Is_Constant_Bound --
7133 -----------------------
7135 function Is_Constant_Bound (Exp : Node_Id) return Boolean is
7137 if Nkind (Exp) = N_Integer_Literal then
7141 Is_Entity_Name (Exp)
7142 and then Present (Entity (Exp))
7144 (Ekind (Entity (Exp)) = E_Constant
7145 or else Ekind (Entity (Exp)) = E_Enumeration_Literal);
7147 end Is_Constant_Bound;
7149 -- Start of processing for Is_Variable_Sized_Record
7152 pragma Assert (Is_Record_Type (E));
7154 Comp := First_Entity (E);
7155 while Present (Comp) loop
7156 Comp_Typ := Etype (Comp);
7158 if Is_Record_Type (Comp_Typ) then
7160 -- Recursive call if the record type has discriminants
7162 if Has_Discriminants (Comp_Typ)
7163 and then Is_Variable_Size_Record (Comp_Typ)
7168 elsif Is_Array_Type (Comp_Typ) then
7170 -- Check if some index is initialized with a non-constant value
7172 Idx := First_Index (Comp_Typ);
7173 while Present (Idx) loop
7174 if Nkind (Idx) = N_Range then
7175 if not Is_Constant_Bound (Low_Bound (Idx))
7177 not Is_Constant_Bound (High_Bound (Idx))
7183 Idx := Next_Index (Idx);
7191 end Is_Variable_Size_Record;
7193 ----------------------------------------
7194 -- Make_Controlling_Function_Wrappers --
7195 ----------------------------------------
7197 procedure Make_Controlling_Function_Wrappers
7198 (Tag_Typ : Entity_Id;
7199 Decl_List : out List_Id;
7200 Body_List : out List_Id)
7202 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7203 Prim_Elmt : Elmt_Id;
7205 Actual_List : List_Id;
7206 Formal_List : List_Id;
7208 Par_Formal : Entity_Id;
7209 Formal_Node : Node_Id;
7210 Func_Body : Node_Id;
7211 Func_Decl : Node_Id;
7212 Func_Spec : Node_Id;
7213 Return_Stmt : Node_Id;
7216 Decl_List := New_List;
7217 Body_List := New_List;
7219 Prim_Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
7221 while Present (Prim_Elmt) loop
7222 Subp := Node (Prim_Elmt);
7224 -- If a primitive function with a controlling result of the type has
7225 -- not been overridden by the user, then we must create a wrapper
7226 -- function here that effectively overrides it and invokes the
7227 -- (non-abstract) parent function. This can only occur for a null
7228 -- extension. Note that functions with anonymous controlling access
7229 -- results don't qualify and must be overridden. We also exclude
7230 -- Input attributes, since each type will have its own version of
7231 -- Input constructed by the expander. The test for Comes_From_Source
7232 -- is needed to distinguish inherited operations from renamings
7233 -- (which also have Alias set).
7235 -- The function may be abstract, or require_Overriding may be set
7236 -- for it, because tests for null extensions may already have reset
7237 -- the Is_Abstract_Subprogram_Flag. If Requires_Overriding is not
7238 -- set, functions that need wrappers are recognized by having an
7239 -- alias that returns the parent type.
7241 if Comes_From_Source (Subp)
7242 or else No (Alias (Subp))
7243 or else Ekind (Subp) /= E_Function
7244 or else not Has_Controlling_Result (Subp)
7245 or else Is_Access_Type (Etype (Subp))
7246 or else Is_Abstract_Subprogram (Alias (Subp))
7247 or else Is_TSS (Subp, TSS_Stream_Input)
7251 elsif Is_Abstract_Subprogram (Subp)
7252 or else Requires_Overriding (Subp)
7254 (Is_Null_Extension (Etype (Subp))
7255 and then Etype (Alias (Subp)) /= Etype (Subp))
7257 Formal_List := No_List;
7258 Formal := First_Formal (Subp);
7260 if Present (Formal) then
7261 Formal_List := New_List;
7263 while Present (Formal) loop
7265 (Make_Parameter_Specification
7267 Defining_Identifier =>
7268 Make_Defining_Identifier (Sloc (Formal),
7269 Chars => Chars (Formal)),
7270 In_Present => In_Present (Parent (Formal)),
7271 Out_Present => Out_Present (Parent (Formal)),
7272 Null_Exclusion_Present =>
7273 Null_Exclusion_Present (Parent (Formal)),
7275 New_Reference_To (Etype (Formal), Loc),
7277 New_Copy_Tree (Expression (Parent (Formal)))),
7280 Next_Formal (Formal);
7285 Make_Function_Specification (Loc,
7286 Defining_Unit_Name =>
7287 Make_Defining_Identifier (Loc,
7288 Chars => Chars (Subp)),
7289 Parameter_Specifications => Formal_List,
7290 Result_Definition =>
7291 New_Reference_To (Etype (Subp), Loc));
7293 Func_Decl := Make_Subprogram_Declaration (Loc, Func_Spec);
7294 Append_To (Decl_List, Func_Decl);
7296 -- Build a wrapper body that calls the parent function. The body
7297 -- contains a single return statement that returns an extension
7298 -- aggregate whose ancestor part is a call to the parent function,
7299 -- passing the formals as actuals (with any controlling arguments
7300 -- converted to the types of the corresponding formals of the
7301 -- parent function, which might be anonymous access types), and
7302 -- having a null extension.
7304 Formal := First_Formal (Subp);
7305 Par_Formal := First_Formal (Alias (Subp));
7306 Formal_Node := First (Formal_List);
7308 if Present (Formal) then
7309 Actual_List := New_List;
7311 Actual_List := No_List;
7314 while Present (Formal) loop
7315 if Is_Controlling_Formal (Formal) then
7316 Append_To (Actual_List,
7317 Make_Type_Conversion (Loc,
7319 New_Occurrence_Of (Etype (Par_Formal), Loc),
7322 (Defining_Identifier (Formal_Node), Loc)));
7327 (Defining_Identifier (Formal_Node), Loc));
7330 Next_Formal (Formal);
7331 Next_Formal (Par_Formal);
7336 Make_Simple_Return_Statement (Loc,
7338 Make_Extension_Aggregate (Loc,
7340 Make_Function_Call (Loc,
7341 Name => New_Reference_To (Alias (Subp), Loc),
7342 Parameter_Associations => Actual_List),
7343 Null_Record_Present => True));
7346 Make_Subprogram_Body (Loc,
7347 Specification => New_Copy_Tree (Func_Spec),
7348 Declarations => Empty_List,
7349 Handled_Statement_Sequence =>
7350 Make_Handled_Sequence_Of_Statements (Loc,
7351 Statements => New_List (Return_Stmt)));
7353 Set_Defining_Unit_Name
7354 (Specification (Func_Body),
7355 Make_Defining_Identifier (Loc, Chars (Subp)));
7357 Append_To (Body_List, Func_Body);
7359 -- Replace the inherited function with the wrapper function
7360 -- in the primitive operations list.
7362 Override_Dispatching_Operation
7363 (Tag_Typ, Subp, New_Op => Defining_Unit_Name (Func_Spec));
7367 Next_Elmt (Prim_Elmt);
7369 end Make_Controlling_Function_Wrappers;
7375 -- <Make_Eq_If shared components>
7377 -- when V1 => <Make_Eq_Case> on subcomponents
7379 -- when Vn => <Make_Eq_Case> on subcomponents
7382 function Make_Eq_Case
7385 Discr : Entity_Id := Empty) return List_Id
7387 Loc : constant Source_Ptr := Sloc (E);
7388 Result : constant List_Id := New_List;
7393 Append_To (Result, Make_Eq_If (E, Component_Items (CL)));
7395 if No (Variant_Part (CL)) then
7399 Variant := First_Non_Pragma (Variants (Variant_Part (CL)));
7401 if No (Variant) then
7405 Alt_List := New_List;
7407 while Present (Variant) loop
7408 Append_To (Alt_List,
7409 Make_Case_Statement_Alternative (Loc,
7410 Discrete_Choices => New_Copy_List (Discrete_Choices (Variant)),
7411 Statements => Make_Eq_Case (E, Component_List (Variant))));
7413 Next_Non_Pragma (Variant);
7416 -- If we have an Unchecked_Union, use one of the parameters that
7417 -- captures the discriminants.
7419 if Is_Unchecked_Union (E) then
7421 Make_Case_Statement (Loc,
7422 Expression => New_Reference_To (Discr, Loc),
7423 Alternatives => Alt_List));
7427 Make_Case_Statement (Loc,
7429 Make_Selected_Component (Loc,
7430 Prefix => Make_Identifier (Loc, Name_X),
7431 Selector_Name => New_Copy (Name (Variant_Part (CL)))),
7432 Alternatives => Alt_List));
7453 -- or a null statement if the list L is empty
7457 L : List_Id) return Node_Id
7459 Loc : constant Source_Ptr := Sloc (E);
7461 Field_Name : Name_Id;
7466 return Make_Null_Statement (Loc);
7471 C := First_Non_Pragma (L);
7472 while Present (C) loop
7473 Field_Name := Chars (Defining_Identifier (C));
7475 -- The tags must not be compared: they are not part of the value.
7476 -- Ditto for the controller component, if present.
7478 -- Note also that in the following, we use Make_Identifier for
7479 -- the component names. Use of New_Reference_To to identify the
7480 -- components would be incorrect because the wrong entities for
7481 -- discriminants could be picked up in the private type case.
7483 if Field_Name /= Name_uTag
7485 Field_Name /= Name_uController
7487 Evolve_Or_Else (Cond,
7490 Make_Selected_Component (Loc,
7491 Prefix => Make_Identifier (Loc, Name_X),
7493 Make_Identifier (Loc, Field_Name)),
7496 Make_Selected_Component (Loc,
7497 Prefix => Make_Identifier (Loc, Name_Y),
7499 Make_Identifier (Loc, Field_Name))));
7502 Next_Non_Pragma (C);
7506 return Make_Null_Statement (Loc);
7510 Make_Implicit_If_Statement (E,
7512 Then_Statements => New_List (
7513 Make_Simple_Return_Statement (Loc,
7514 Expression => New_Occurrence_Of (Standard_False, Loc))));
7519 -------------------------------
7520 -- Make_Null_Procedure_Specs --
7521 -------------------------------
7523 procedure Make_Null_Procedure_Specs
7524 (Tag_Typ : Entity_Id;
7525 Decl_List : out List_Id)
7527 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7530 Formal_List : List_Id;
7531 New_Param_Spec : Node_Id;
7532 Parent_Subp : Entity_Id;
7533 Prim_Elmt : Elmt_Id;
7534 Proc_Decl : Node_Id;
7537 function Is_Null_Interface_Primitive (E : Entity_Id) return Boolean;
7538 -- Returns True if E is a null procedure that is an interface primitive
7540 ---------------------------------
7541 -- Is_Null_Interface_Primitive --
7542 ---------------------------------
7544 function Is_Null_Interface_Primitive (E : Entity_Id) return Boolean is
7546 return Comes_From_Source (E)
7547 and then Is_Dispatching_Operation (E)
7548 and then Ekind (E) = E_Procedure
7549 and then Null_Present (Parent (E))
7550 and then Is_Interface (Find_Dispatching_Type (E));
7551 end Is_Null_Interface_Primitive;
7553 -- Start of processing for Make_Null_Procedure_Specs
7556 Decl_List := New_List;
7557 Prim_Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
7558 while Present (Prim_Elmt) loop
7559 Subp := Node (Prim_Elmt);
7561 -- If a null procedure inherited from an interface has not been
7562 -- overridden, then we build a null procedure declaration to
7563 -- override the inherited procedure.
7565 Parent_Subp := Alias (Subp);
7567 if Present (Parent_Subp)
7568 and then Is_Null_Interface_Primitive (Parent_Subp)
7570 Formal_List := No_List;
7571 Formal := First_Formal (Subp);
7573 if Present (Formal) then
7574 Formal_List := New_List;
7576 while Present (Formal) loop
7578 -- Copy the parameter spec including default expressions
7581 New_Copy_Tree (Parent (Formal), New_Sloc => Loc);
7583 -- Generate a new defining identifier for the new formal.
7584 -- required because New_Copy_Tree does not duplicate
7585 -- semantic fields (except itypes).
7587 Set_Defining_Identifier (New_Param_Spec,
7588 Make_Defining_Identifier (Sloc (Formal),
7589 Chars => Chars (Formal)));
7591 -- For controlling arguments we must change their
7592 -- parameter type to reference the tagged type (instead
7593 -- of the interface type)
7595 if Is_Controlling_Formal (Formal) then
7596 if Nkind (Parameter_Type (Parent (Formal)))
7599 Set_Parameter_Type (New_Param_Spec,
7600 New_Occurrence_Of (Tag_Typ, Loc));
7603 (Nkind (Parameter_Type (Parent (Formal)))
7604 = N_Access_Definition);
7605 Set_Subtype_Mark (Parameter_Type (New_Param_Spec),
7606 New_Occurrence_Of (Tag_Typ, Loc));
7610 Append (New_Param_Spec, Formal_List);
7612 Next_Formal (Formal);
7617 Make_Subprogram_Declaration (Loc,
7618 Make_Procedure_Specification (Loc,
7619 Defining_Unit_Name =>
7620 Make_Defining_Identifier (Loc, Chars (Subp)),
7621 Parameter_Specifications => Formal_List,
7622 Null_Present => True));
7623 Append_To (Decl_List, Proc_Decl);
7624 Analyze (Proc_Decl);
7627 Next_Elmt (Prim_Elmt);
7629 end Make_Null_Procedure_Specs;
7631 -------------------------------------
7632 -- Make_Predefined_Primitive_Specs --
7633 -------------------------------------
7635 procedure Make_Predefined_Primitive_Specs
7636 (Tag_Typ : Entity_Id;
7637 Predef_List : out List_Id;
7638 Renamed_Eq : out Entity_Id)
7640 Loc : constant Source_Ptr := Sloc (Tag_Typ);
7641 Res : constant List_Id := New_List;
7643 Eq_Needed : Boolean;
7645 Eq_Name : Name_Id := Name_Op_Eq;
7647 function Is_Predefined_Eq_Renaming (Prim : Node_Id) return Boolean;
7648 -- Returns true if Prim is a renaming of an unresolved predefined
7649 -- equality operation.
7651 -------------------------------
7652 -- Is_Predefined_Eq_Renaming --
7653 -------------------------------
7655 function Is_Predefined_Eq_Renaming (Prim : Node_Id) return Boolean is
7657 return Chars (Prim) /= Name_Op_Eq
7658 and then Present (Alias (Prim))
7659 and then Comes_From_Source (Prim)
7660 and then Is_Intrinsic_Subprogram (Alias (Prim))
7661 and then Chars (Alias (Prim)) = Name_Op_Eq;
7662 end Is_Predefined_Eq_Renaming;
7664 -- Start of processing for Make_Predefined_Primitive_Specs
7667 Renamed_Eq := Empty;
7671 Append_To (Res, Predef_Spec_Or_Body (Loc,
7674 Profile => New_List (
7675 Make_Parameter_Specification (Loc,
7676 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7677 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7679 Ret_Type => Standard_Long_Long_Integer));
7681 -- Spec of _Alignment
7683 Append_To (Res, Predef_Spec_Or_Body (Loc,
7685 Name => Name_uAlignment,
7686 Profile => New_List (
7687 Make_Parameter_Specification (Loc,
7688 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7689 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7691 Ret_Type => Standard_Integer));
7693 -- Specs for dispatching stream attributes
7696 Stream_Op_TSS_Names :
7697 constant array (Integer range <>) of TSS_Name_Type :=
7704 for Op in Stream_Op_TSS_Names'Range loop
7705 if Stream_Operation_OK (Tag_Typ, Stream_Op_TSS_Names (Op)) then
7707 Predef_Stream_Attr_Spec (Loc, Tag_Typ,
7708 Stream_Op_TSS_Names (Op)));
7713 -- Spec of "=" is expanded if the type is not limited and if a
7714 -- user defined "=" was not already declared for the non-full
7715 -- view of a private extension
7717 if not Is_Limited_Type (Tag_Typ) then
7719 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
7720 while Present (Prim) loop
7722 -- If a primitive is encountered that renames the predefined
7723 -- equality operator before reaching any explicit equality
7724 -- primitive, then we still need to create a predefined
7725 -- equality function, because calls to it can occur via
7726 -- the renaming. A new name is created for the equality
7727 -- to avoid conflicting with any user-defined equality.
7728 -- (Note that this doesn't account for renamings of
7729 -- equality nested within subpackages???)
7731 if Is_Predefined_Eq_Renaming (Node (Prim)) then
7732 Eq_Name := New_External_Name (Chars (Node (Prim)), 'E');
7734 -- User-defined equality
7736 elsif Chars (Node (Prim)) = Name_Op_Eq
7737 and then Etype (First_Formal (Node (Prim))) =
7738 Etype (Next_Formal (First_Formal (Node (Prim))))
7739 and then Base_Type (Etype (Node (Prim))) = Standard_Boolean
7741 if No (Alias (Node (Prim)))
7742 or else Nkind (Unit_Declaration_Node (Node (Prim))) =
7743 N_Subprogram_Renaming_Declaration
7748 -- If the parent is not an interface type and has an abstract
7749 -- equality function, the inherited equality is abstract as
7750 -- well, and no body can be created for it.
7752 elsif not Is_Interface (Etype (Tag_Typ))
7753 and then Present (Alias (Node (Prim)))
7754 and then Is_Abstract_Subprogram (Alias (Node (Prim)))
7759 -- If the type has an equality function corresponding with
7760 -- a primitive defined in an interface type, the inherited
7761 -- equality is abstract as well, and no body can be created
7764 elsif Present (Alias (Node (Prim)))
7765 and then Comes_From_Source (Ultimate_Alias (Node (Prim)))
7768 (Find_Dispatching_Type (Ultimate_Alias (Node (Prim))))
7778 -- If a renaming of predefined equality was found but there was no
7779 -- user-defined equality (so Eq_Needed is still true), then set the
7780 -- name back to Name_Op_Eq. But in the case where a user-defined
7781 -- equality was located after such a renaming, then the predefined
7782 -- equality function is still needed, so Eq_Needed must be set back
7785 if Eq_Name /= Name_Op_Eq then
7787 Eq_Name := Name_Op_Eq;
7794 Eq_Spec := Predef_Spec_Or_Body (Loc,
7797 Profile => New_List (
7798 Make_Parameter_Specification (Loc,
7799 Defining_Identifier =>
7800 Make_Defining_Identifier (Loc, Name_X),
7801 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
7802 Make_Parameter_Specification (Loc,
7803 Defining_Identifier =>
7804 Make_Defining_Identifier (Loc, Name_Y),
7805 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
7806 Ret_Type => Standard_Boolean);
7807 Append_To (Res, Eq_Spec);
7809 if Eq_Name /= Name_Op_Eq then
7810 Renamed_Eq := Defining_Unit_Name (Specification (Eq_Spec));
7812 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
7813 while Present (Prim) loop
7815 -- Any renamings of equality that appeared before an
7816 -- overriding equality must be updated to refer to the
7817 -- entity for the predefined equality, otherwise calls via
7818 -- the renaming would get incorrectly resolved to call the
7819 -- user-defined equality function.
7821 if Is_Predefined_Eq_Renaming (Node (Prim)) then
7822 Set_Alias (Node (Prim), Renamed_Eq);
7824 -- Exit upon encountering a user-defined equality
7826 elsif Chars (Node (Prim)) = Name_Op_Eq
7827 and then No (Alias (Node (Prim)))
7837 -- Spec for dispatching assignment
7839 Append_To (Res, Predef_Spec_Or_Body (Loc,
7841 Name => Name_uAssign,
7842 Profile => New_List (
7843 Make_Parameter_Specification (Loc,
7844 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
7845 Out_Present => True,
7846 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
7848 Make_Parameter_Specification (Loc,
7849 Defining_Identifier => Make_Defining_Identifier (Loc, Name_Y),
7850 Parameter_Type => New_Reference_To (Tag_Typ, Loc)))));
7853 -- Ada 2005: Generate declarations for the following primitive
7854 -- operations for limited interfaces and synchronized types that
7855 -- implement a limited interface.
7857 -- Disp_Asynchronous_Select
7858 -- Disp_Conditional_Select
7859 -- Disp_Get_Prim_Op_Kind
7862 -- Disp_Timed_Select
7864 -- These operations cannot be implemented on VM targets, so we simply
7865 -- disable their generation in this case. Disable the generation of
7866 -- these bodies if No_Dispatching_Calls, Ravenscar or ZFP is active.
7868 if Ada_Version >= Ada_05
7869 and then VM_Target = No_VM
7870 and then not Restriction_Active (No_Dispatching_Calls)
7871 and then not Restriction_Active (No_Select_Statements)
7872 and then RTE_Available (RE_Select_Specific_Data)
7874 -- These primitives are defined abstract in interface types
7876 if Is_Interface (Tag_Typ)
7877 and then Is_Limited_Record (Tag_Typ)
7880 Make_Abstract_Subprogram_Declaration (Loc,
7882 Make_Disp_Asynchronous_Select_Spec (Tag_Typ)));
7885 Make_Abstract_Subprogram_Declaration (Loc,
7887 Make_Disp_Conditional_Select_Spec (Tag_Typ)));
7890 Make_Abstract_Subprogram_Declaration (Loc,
7892 Make_Disp_Get_Prim_Op_Kind_Spec (Tag_Typ)));
7895 Make_Abstract_Subprogram_Declaration (Loc,
7897 Make_Disp_Get_Task_Id_Spec (Tag_Typ)));
7900 Make_Abstract_Subprogram_Declaration (Loc,
7902 Make_Disp_Requeue_Spec (Tag_Typ)));
7905 Make_Abstract_Subprogram_Declaration (Loc,
7907 Make_Disp_Timed_Select_Spec (Tag_Typ)));
7909 -- If the ancestor is an interface type we declare non-abstract
7910 -- primitives to override the abstract primitives of the interface
7913 elsif (not Is_Interface (Tag_Typ)
7914 and then Is_Interface (Etype (Tag_Typ))
7915 and then Is_Limited_Record (Etype (Tag_Typ)))
7917 (Is_Concurrent_Record_Type (Tag_Typ)
7918 and then Has_Interfaces (Tag_Typ))
7921 Make_Subprogram_Declaration (Loc,
7923 Make_Disp_Asynchronous_Select_Spec (Tag_Typ)));
7926 Make_Subprogram_Declaration (Loc,
7928 Make_Disp_Conditional_Select_Spec (Tag_Typ)));
7931 Make_Subprogram_Declaration (Loc,
7933 Make_Disp_Get_Prim_Op_Kind_Spec (Tag_Typ)));
7936 Make_Subprogram_Declaration (Loc,
7938 Make_Disp_Get_Task_Id_Spec (Tag_Typ)));
7941 Make_Subprogram_Declaration (Loc,
7943 Make_Disp_Requeue_Spec (Tag_Typ)));
7946 Make_Subprogram_Declaration (Loc,
7948 Make_Disp_Timed_Select_Spec (Tag_Typ)));
7952 -- Specs for finalization actions that may be required in case a future
7953 -- extension contain a controlled element. We generate those only for
7954 -- root tagged types where they will get dummy bodies or when the type
7955 -- has controlled components and their body must be generated. It is
7956 -- also impossible to provide those for tagged types defined within
7957 -- s-finimp since it would involve circularity problems
7959 if In_Finalization_Root (Tag_Typ) then
7962 -- We also skip these if finalization is not available
7964 elsif Restriction_Active (No_Finalization) then
7967 elsif Etype (Tag_Typ) = Tag_Typ
7968 or else Needs_Finalization (Tag_Typ)
7970 -- Ada 2005 (AI-251): We must also generate these subprograms if
7971 -- the immediate ancestor is an interface to ensure the correct
7972 -- initialization of its dispatch table.
7974 or else (not Is_Interface (Tag_Typ)
7975 and then Is_Interface (Etype (Tag_Typ)))
7977 -- Ada 205 (AI-251): We must also generate these subprograms if
7978 -- the parent of an nonlimited interface is a limited interface
7980 or else (Is_Interface (Tag_Typ)
7981 and then not Is_Limited_Interface (Tag_Typ)
7982 and then Is_Limited_Interface (Etype (Tag_Typ)))
7984 if not Is_Limited_Type (Tag_Typ) then
7986 Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Adjust));
7989 Append_To (Res, Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Finalize));
7993 end Make_Predefined_Primitive_Specs;
7995 ---------------------------------
7996 -- Needs_Simple_Initialization --
7997 ---------------------------------
7999 function Needs_Simple_Initialization (T : Entity_Id) return Boolean is
8001 -- Check for private type, in which case test applies to the underlying
8002 -- type of the private type.
8004 if Is_Private_Type (T) then
8006 RT : constant Entity_Id := Underlying_Type (T);
8009 if Present (RT) then
8010 return Needs_Simple_Initialization (RT);
8016 -- Cases needing simple initialization are access types, and, if pragma
8017 -- Normalize_Scalars or Initialize_Scalars is in effect, then all scalar
8020 elsif Is_Access_Type (T)
8021 or else (Init_Or_Norm_Scalars and then (Is_Scalar_Type (T)))
8025 -- If Initialize/Normalize_Scalars is in effect, string objects also
8026 -- need initialization, unless they are created in the course of
8027 -- expanding an aggregate (since in the latter case they will be
8028 -- filled with appropriate initializing values before they are used).
8030 elsif Init_Or_Norm_Scalars
8032 (Root_Type (T) = Standard_String
8033 or else Root_Type (T) = Standard_Wide_String
8034 or else Root_Type (T) = Standard_Wide_Wide_String)
8037 or else Nkind (Associated_Node_For_Itype (T)) /= N_Aggregate)
8044 end Needs_Simple_Initialization;
8046 ----------------------
8047 -- Predef_Deep_Spec --
8048 ----------------------
8050 function Predef_Deep_Spec
8052 Tag_Typ : Entity_Id;
8053 Name : TSS_Name_Type;
8054 For_Body : Boolean := False) return Node_Id
8060 if Name = TSS_Deep_Finalize then
8062 Type_B := Standard_Boolean;
8066 Make_Parameter_Specification (Loc,
8067 Defining_Identifier => Make_Defining_Identifier (Loc, Name_L),
8069 Out_Present => True,
8071 New_Reference_To (RTE (RE_Finalizable_Ptr), Loc)));
8072 Type_B := Standard_Short_Short_Integer;
8076 Make_Parameter_Specification (Loc,
8077 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
8079 Out_Present => True,
8080 Parameter_Type => New_Reference_To (Tag_Typ, Loc)));
8083 Make_Parameter_Specification (Loc,
8084 Defining_Identifier => Make_Defining_Identifier (Loc, Name_B),
8085 Parameter_Type => New_Reference_To (Type_B, Loc)));
8087 return Predef_Spec_Or_Body (Loc,
8088 Name => Make_TSS_Name (Tag_Typ, Name),
8091 For_Body => For_Body);
8094 when RE_Not_Available =>
8096 end Predef_Deep_Spec;
8098 -------------------------
8099 -- Predef_Spec_Or_Body --
8100 -------------------------
8102 function Predef_Spec_Or_Body
8104 Tag_Typ : Entity_Id;
8107 Ret_Type : Entity_Id := Empty;
8108 For_Body : Boolean := False) return Node_Id
8110 Id : constant Entity_Id := Make_Defining_Identifier (Loc, Name);
8114 Set_Is_Public (Id, Is_Public (Tag_Typ));
8116 -- The internal flag is set to mark these declarations because they have
8117 -- specific properties. First, they are primitives even if they are not
8118 -- defined in the type scope (the freezing point is not necessarily in
8119 -- the same scope). Second, the predefined equality can be overridden by
8120 -- a user-defined equality, no body will be generated in this case.
8122 Set_Is_Internal (Id);
8124 if not Debug_Generated_Code then
8125 Set_Debug_Info_Off (Id);
8128 if No (Ret_Type) then
8130 Make_Procedure_Specification (Loc,
8131 Defining_Unit_Name => Id,
8132 Parameter_Specifications => Profile);
8135 Make_Function_Specification (Loc,
8136 Defining_Unit_Name => Id,
8137 Parameter_Specifications => Profile,
8138 Result_Definition =>
8139 New_Reference_To (Ret_Type, Loc));
8142 if Is_Interface (Tag_Typ) then
8143 return Make_Abstract_Subprogram_Declaration (Loc, Spec);
8145 -- If body case, return empty subprogram body. Note that this is ill-
8146 -- formed, because there is not even a null statement, and certainly not
8147 -- a return in the function case. The caller is expected to do surgery
8148 -- on the body to add the appropriate stuff.
8151 return Make_Subprogram_Body (Loc, Spec, Empty_List, Empty);
8153 -- For the case of an Input attribute predefined for an abstract type,
8154 -- generate an abstract specification. This will never be called, but we
8155 -- need the slot allocated in the dispatching table so that attributes
8156 -- typ'Class'Input and typ'Class'Output will work properly.
8158 elsif Is_TSS (Name, TSS_Stream_Input)
8159 and then Is_Abstract_Type (Tag_Typ)
8161 return Make_Abstract_Subprogram_Declaration (Loc, Spec);
8163 -- Normal spec case, where we return a subprogram declaration
8166 return Make_Subprogram_Declaration (Loc, Spec);
8168 end Predef_Spec_Or_Body;
8170 -----------------------------
8171 -- Predef_Stream_Attr_Spec --
8172 -----------------------------
8174 function Predef_Stream_Attr_Spec
8176 Tag_Typ : Entity_Id;
8177 Name : TSS_Name_Type;
8178 For_Body : Boolean := False) return Node_Id
8180 Ret_Type : Entity_Id;
8183 if Name = TSS_Stream_Input then
8184 Ret_Type := Tag_Typ;
8189 return Predef_Spec_Or_Body (Loc,
8190 Name => Make_TSS_Name (Tag_Typ, Name),
8192 Profile => Build_Stream_Attr_Profile (Loc, Tag_Typ, Name),
8193 Ret_Type => Ret_Type,
8194 For_Body => For_Body);
8195 end Predef_Stream_Attr_Spec;
8197 ---------------------------------
8198 -- Predefined_Primitive_Bodies --
8199 ---------------------------------
8201 function Predefined_Primitive_Bodies
8202 (Tag_Typ : Entity_Id;
8203 Renamed_Eq : Entity_Id) return List_Id
8205 Loc : constant Source_Ptr := Sloc (Tag_Typ);
8206 Res : constant List_Id := New_List;
8209 Eq_Needed : Boolean;
8213 pragma Warnings (Off, Ent);
8216 pragma Assert (not Is_Interface (Tag_Typ));
8218 -- See if we have a predefined "=" operator
8220 if Present (Renamed_Eq) then
8222 Eq_Name := Chars (Renamed_Eq);
8224 -- If the parent is an interface type then it has defined all the
8225 -- predefined primitives abstract and we need to check if the type
8226 -- has some user defined "=" function to avoid generating it.
8228 elsif Is_Interface (Etype (Tag_Typ)) then
8230 Eq_Name := Name_Op_Eq;
8232 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8233 while Present (Prim) loop
8234 if Chars (Node (Prim)) = Name_Op_Eq
8235 and then not Is_Internal (Node (Prim))
8249 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8250 while Present (Prim) loop
8251 if Chars (Node (Prim)) = Name_Op_Eq
8252 and then Is_Internal (Node (Prim))
8255 Eq_Name := Name_Op_Eq;
8263 -- Body of _Alignment
8265 Decl := Predef_Spec_Or_Body (Loc,
8267 Name => Name_uAlignment,
8268 Profile => New_List (
8269 Make_Parameter_Specification (Loc,
8270 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8271 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8273 Ret_Type => Standard_Integer,
8276 Set_Handled_Statement_Sequence (Decl,
8277 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8278 Make_Simple_Return_Statement (Loc,
8280 Make_Attribute_Reference (Loc,
8281 Prefix => Make_Identifier (Loc, Name_X),
8282 Attribute_Name => Name_Alignment)))));
8284 Append_To (Res, Decl);
8288 Decl := Predef_Spec_Or_Body (Loc,
8291 Profile => New_List (
8292 Make_Parameter_Specification (Loc,
8293 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8294 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8296 Ret_Type => Standard_Long_Long_Integer,
8299 Set_Handled_Statement_Sequence (Decl,
8300 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8301 Make_Simple_Return_Statement (Loc,
8303 Make_Attribute_Reference (Loc,
8304 Prefix => Make_Identifier (Loc, Name_X),
8305 Attribute_Name => Name_Size)))));
8307 Append_To (Res, Decl);
8309 -- Bodies for Dispatching stream IO routines. We need these only for
8310 -- non-limited types (in the limited case there is no dispatching).
8311 -- We also skip them if dispatching or finalization are not available.
8313 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Read)
8314 and then No (TSS (Tag_Typ, TSS_Stream_Read))
8316 Build_Record_Read_Procedure (Loc, Tag_Typ, Decl, Ent);
8317 Append_To (Res, Decl);
8320 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Write)
8321 and then No (TSS (Tag_Typ, TSS_Stream_Write))
8323 Build_Record_Write_Procedure (Loc, Tag_Typ, Decl, Ent);
8324 Append_To (Res, Decl);
8327 -- Skip body of _Input for the abstract case, since the corresponding
8328 -- spec is abstract (see Predef_Spec_Or_Body).
8330 if not Is_Abstract_Type (Tag_Typ)
8331 and then Stream_Operation_OK (Tag_Typ, TSS_Stream_Input)
8332 and then No (TSS (Tag_Typ, TSS_Stream_Input))
8334 Build_Record_Or_Elementary_Input_Function
8335 (Loc, Tag_Typ, Decl, Ent);
8336 Append_To (Res, Decl);
8339 if Stream_Operation_OK (Tag_Typ, TSS_Stream_Output)
8340 and then No (TSS (Tag_Typ, TSS_Stream_Output))
8342 Build_Record_Or_Elementary_Output_Procedure
8343 (Loc, Tag_Typ, Decl, Ent);
8344 Append_To (Res, Decl);
8347 -- Ada 2005: Generate bodies for the following primitive operations for
8348 -- limited interfaces and synchronized types that implement a limited
8351 -- disp_asynchronous_select
8352 -- disp_conditional_select
8353 -- disp_get_prim_op_kind
8355 -- disp_timed_select
8357 -- The interface versions will have null bodies
8359 -- These operations cannot be implemented on VM targets, so we simply
8360 -- disable their generation in this case. Disable the generation of
8361 -- these bodies if No_Dispatching_Calls, Ravenscar or ZFP is active.
8363 if Ada_Version >= Ada_05
8364 and then VM_Target = No_VM
8365 and then not Is_Interface (Tag_Typ)
8367 ((Is_Interface (Etype (Tag_Typ))
8368 and then Is_Limited_Record (Etype (Tag_Typ)))
8369 or else (Is_Concurrent_Record_Type (Tag_Typ)
8370 and then Has_Interfaces (Tag_Typ)))
8371 and then not Restriction_Active (No_Dispatching_Calls)
8372 and then not Restriction_Active (No_Select_Statements)
8373 and then RTE_Available (RE_Select_Specific_Data)
8375 Append_To (Res, Make_Disp_Asynchronous_Select_Body (Tag_Typ));
8376 Append_To (Res, Make_Disp_Conditional_Select_Body (Tag_Typ));
8377 Append_To (Res, Make_Disp_Get_Prim_Op_Kind_Body (Tag_Typ));
8378 Append_To (Res, Make_Disp_Get_Task_Id_Body (Tag_Typ));
8379 Append_To (Res, Make_Disp_Requeue_Body (Tag_Typ));
8380 Append_To (Res, Make_Disp_Timed_Select_Body (Tag_Typ));
8383 if not Is_Limited_Type (Tag_Typ)
8384 and then not Is_Interface (Tag_Typ)
8386 -- Body for equality
8390 Predef_Spec_Or_Body (Loc,
8393 Profile => New_List (
8394 Make_Parameter_Specification (Loc,
8395 Defining_Identifier =>
8396 Make_Defining_Identifier (Loc, Name_X),
8397 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
8399 Make_Parameter_Specification (Loc,
8400 Defining_Identifier =>
8401 Make_Defining_Identifier (Loc, Name_Y),
8402 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8404 Ret_Type => Standard_Boolean,
8408 Def : constant Node_Id := Parent (Tag_Typ);
8409 Stmts : constant List_Id := New_List;
8410 Variant_Case : Boolean := Has_Discriminants (Tag_Typ);
8411 Comps : Node_Id := Empty;
8412 Typ_Def : Node_Id := Type_Definition (Def);
8415 if Variant_Case then
8416 if Nkind (Typ_Def) = N_Derived_Type_Definition then
8417 Typ_Def := Record_Extension_Part (Typ_Def);
8420 if Present (Typ_Def) then
8421 Comps := Component_List (Typ_Def);
8424 Variant_Case := Present (Comps)
8425 and then Present (Variant_Part (Comps));
8428 if Variant_Case then
8430 Make_Eq_If (Tag_Typ, Discriminant_Specifications (Def)));
8431 Append_List_To (Stmts, Make_Eq_Case (Tag_Typ, Comps));
8433 Make_Simple_Return_Statement (Loc,
8434 Expression => New_Reference_To (Standard_True, Loc)));
8438 Make_Simple_Return_Statement (Loc,
8440 Expand_Record_Equality (Tag_Typ,
8442 Lhs => Make_Identifier (Loc, Name_X),
8443 Rhs => Make_Identifier (Loc, Name_Y),
8444 Bodies => Declarations (Decl))));
8447 Set_Handled_Statement_Sequence (Decl,
8448 Make_Handled_Sequence_Of_Statements (Loc, Stmts));
8450 Append_To (Res, Decl);
8453 -- Body for dispatching assignment
8456 Predef_Spec_Or_Body (Loc,
8458 Name => Name_uAssign,
8459 Profile => New_List (
8460 Make_Parameter_Specification (Loc,
8461 Defining_Identifier => Make_Defining_Identifier (Loc, Name_X),
8462 Out_Present => True,
8463 Parameter_Type => New_Reference_To (Tag_Typ, Loc)),
8465 Make_Parameter_Specification (Loc,
8466 Defining_Identifier => Make_Defining_Identifier (Loc, Name_Y),
8467 Parameter_Type => New_Reference_To (Tag_Typ, Loc))),
8470 Set_Handled_Statement_Sequence (Decl,
8471 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8472 Make_Assignment_Statement (Loc,
8473 Name => Make_Identifier (Loc, Name_X),
8474 Expression => Make_Identifier (Loc, Name_Y)))));
8476 Append_To (Res, Decl);
8479 -- Generate dummy bodies for finalization actions of types that have
8480 -- no controlled components.
8482 -- Skip this processing if we are in the finalization routine in the
8483 -- runtime itself, otherwise we get hopelessly circularly confused!
8485 if In_Finalization_Root (Tag_Typ) then
8488 -- Skip this if finalization is not available
8490 elsif Restriction_Active (No_Finalization) then
8493 elsif (Etype (Tag_Typ) = Tag_Typ
8494 or else Is_Controlled (Tag_Typ)
8496 -- Ada 2005 (AI-251): We must also generate these subprograms
8497 -- if the immediate ancestor of Tag_Typ is an interface to
8498 -- ensure the correct initialization of its dispatch table.
8500 or else (not Is_Interface (Tag_Typ)
8502 Is_Interface (Etype (Tag_Typ))))
8503 and then not Has_Controlled_Component (Tag_Typ)
8505 if not Is_Limited_Type (Tag_Typ) then
8506 Decl := Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Adjust, True);
8508 if Is_Controlled (Tag_Typ) then
8509 Set_Handled_Statement_Sequence (Decl,
8510 Make_Handled_Sequence_Of_Statements (Loc,
8512 Ref => Make_Identifier (Loc, Name_V),
8514 Flist_Ref => Make_Identifier (Loc, Name_L),
8515 With_Attach => Make_Identifier (Loc, Name_B))));
8518 Set_Handled_Statement_Sequence (Decl,
8519 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8520 Make_Null_Statement (Loc))));
8523 Append_To (Res, Decl);
8526 Decl := Predef_Deep_Spec (Loc, Tag_Typ, TSS_Deep_Finalize, True);
8528 if Is_Controlled (Tag_Typ) then
8529 Set_Handled_Statement_Sequence (Decl,
8530 Make_Handled_Sequence_Of_Statements (Loc,
8532 Ref => Make_Identifier (Loc, Name_V),
8534 With_Detach => Make_Identifier (Loc, Name_B))));
8537 Set_Handled_Statement_Sequence (Decl,
8538 Make_Handled_Sequence_Of_Statements (Loc, New_List (
8539 Make_Null_Statement (Loc))));
8542 Append_To (Res, Decl);
8546 end Predefined_Primitive_Bodies;
8548 ---------------------------------
8549 -- Predefined_Primitive_Freeze --
8550 ---------------------------------
8552 function Predefined_Primitive_Freeze
8553 (Tag_Typ : Entity_Id) return List_Id
8555 Loc : constant Source_Ptr := Sloc (Tag_Typ);
8556 Res : constant List_Id := New_List;
8561 Prim := First_Elmt (Primitive_Operations (Tag_Typ));
8562 while Present (Prim) loop
8563 if Is_Predefined_Dispatching_Operation (Node (Prim)) then
8564 Frnodes := Freeze_Entity (Node (Prim), Loc);
8566 if Present (Frnodes) then
8567 Append_List_To (Res, Frnodes);
8575 end Predefined_Primitive_Freeze;
8577 -------------------------
8578 -- Stream_Operation_OK --
8579 -------------------------
8581 function Stream_Operation_OK
8583 Operation : TSS_Name_Type) return Boolean
8585 Has_Predefined_Or_Specified_Stream_Attribute : Boolean := False;
8588 -- Special case of a limited type extension: a default implementation
8589 -- of the stream attributes Read or Write exists if that attribute
8590 -- has been specified or is available for an ancestor type; a default
8591 -- implementation of the attribute Output (resp. Input) exists if the
8592 -- attribute has been specified or Write (resp. Read) is available for
8593 -- an ancestor type. The last condition only applies under Ada 2005.
8595 if Is_Limited_Type (Typ)
8596 and then Is_Tagged_Type (Typ)
8598 if Operation = TSS_Stream_Read then
8599 Has_Predefined_Or_Specified_Stream_Attribute :=
8600 Has_Specified_Stream_Read (Typ);
8602 elsif Operation = TSS_Stream_Write then
8603 Has_Predefined_Or_Specified_Stream_Attribute :=
8604 Has_Specified_Stream_Write (Typ);
8606 elsif Operation = TSS_Stream_Input then
8607 Has_Predefined_Or_Specified_Stream_Attribute :=
8608 Has_Specified_Stream_Input (Typ)
8610 (Ada_Version >= Ada_05
8611 and then Stream_Operation_OK (Typ, TSS_Stream_Read));
8613 elsif Operation = TSS_Stream_Output then
8614 Has_Predefined_Or_Specified_Stream_Attribute :=
8615 Has_Specified_Stream_Output (Typ)
8617 (Ada_Version >= Ada_05
8618 and then Stream_Operation_OK (Typ, TSS_Stream_Write));
8621 -- Case of inherited TSS_Stream_Read or TSS_Stream_Write
8623 if not Has_Predefined_Or_Specified_Stream_Attribute
8624 and then Is_Derived_Type (Typ)
8625 and then (Operation = TSS_Stream_Read
8626 or else Operation = TSS_Stream_Write)
8628 Has_Predefined_Or_Specified_Stream_Attribute :=
8630 (Find_Inherited_TSS (Base_Type (Etype (Typ)), Operation));
8634 -- If the type is not limited, or else is limited but the attribute is
8635 -- explicitly specified or is predefined for the type, then return True,
8636 -- unless other conditions prevail, such as restrictions prohibiting
8637 -- streams or dispatching operations.
8639 -- We exclude the Input operation from being a predefined subprogram in
8640 -- the case where the associated type is an abstract extension, because
8641 -- the attribute is not callable in that case, per 13.13.2(49/2). Also,
8642 -- we don't want an abstract version created because types derived from
8643 -- the abstract type may not even have Input available (for example if
8644 -- derived from a private view of the abstract type that doesn't have
8645 -- a visible Input), but a VM such as .NET or the Java VM can treat the
8646 -- operation as inherited anyway, and we don't want an abstract function
8647 -- to be (implicitly) inherited in that case because it can lead to a VM
8650 return (not Is_Limited_Type (Typ)
8651 or else Has_Predefined_Or_Specified_Stream_Attribute)
8652 and then (Operation /= TSS_Stream_Input
8653 or else not Is_Abstract_Type (Typ)
8654 or else not Is_Derived_Type (Typ))
8655 and then not Has_Unknown_Discriminants (Typ)
8656 and then not (Is_Interface (Typ)
8657 and then (Is_Task_Interface (Typ)
8658 or else Is_Protected_Interface (Typ)
8659 or else Is_Synchronized_Interface (Typ)))
8660 and then not Restriction_Active (No_Streams)
8661 and then not Restriction_Active (No_Dispatch)
8662 and then not No_Run_Time_Mode
8663 and then RTE_Available (RE_Tag)
8664 and then RTE_Available (RE_Root_Stream_Type);
8665 end Stream_Operation_OK;