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 Debug; use Debug;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Expander; use Expander;
33 with Exp_Ch6; use Exp_Ch6;
34 with Exp_Ch7; use Exp_Ch7;
35 with Exp_Ch9; use Exp_Ch9;
36 with Exp_Disp; use Exp_Disp;
37 with Exp_Tss; use Exp_Tss;
38 with Exp_Util; use Exp_Util;
39 with Fname; use Fname;
40 with Freeze; use Freeze;
41 with Itypes; use Itypes;
42 with Lib.Xref; use Lib.Xref;
43 with Layout; use Layout;
44 with Namet; use Namet;
46 with Nlists; use Nlists;
47 with Nmake; use Nmake;
49 with Output; use Output;
50 with Restrict; use Restrict;
51 with Rident; use Rident;
52 with Rtsfind; use Rtsfind;
54 with Sem_Aux; use Sem_Aux;
55 with Sem_Cat; use Sem_Cat;
56 with Sem_Ch3; use Sem_Ch3;
57 with Sem_Ch4; use Sem_Ch4;
58 with Sem_Ch5; use Sem_Ch5;
59 with Sem_Ch8; use Sem_Ch8;
60 with Sem_Ch10; use Sem_Ch10;
61 with Sem_Ch12; use Sem_Ch12;
62 with Sem_Disp; use Sem_Disp;
63 with Sem_Dist; use Sem_Dist;
64 with Sem_Elim; use Sem_Elim;
65 with Sem_Eval; use Sem_Eval;
66 with Sem_Mech; use Sem_Mech;
67 with Sem_Prag; use Sem_Prag;
68 with Sem_Res; use Sem_Res;
69 with Sem_Util; use Sem_Util;
70 with Sem_Type; use Sem_Type;
71 with Sem_Warn; use Sem_Warn;
72 with Sinput; use Sinput;
73 with Stand; use Stand;
74 with Sinfo; use Sinfo;
75 with Sinfo.CN; use Sinfo.CN;
76 with Snames; use Snames;
77 with Stringt; use Stringt;
79 with Stylesw; use Stylesw;
80 with Tbuild; use Tbuild;
81 with Uintp; use Uintp;
82 with Urealp; use Urealp;
83 with Validsw; use Validsw;
85 package body Sem_Ch6 is
87 May_Hide_Profile : Boolean := False;
88 -- This flag is used to indicate that two formals in two subprograms being
89 -- checked for conformance differ only in that one is an access parameter
90 -- while the other is of a general access type with the same designated
91 -- type. In this case, if the rest of the signatures match, a call to
92 -- either subprogram may be ambiguous, which is worth a warning. The flag
93 -- is set in Compatible_Types, and the warning emitted in
94 -- New_Overloaded_Entity.
96 -----------------------
97 -- Local Subprograms --
98 -----------------------
100 procedure Analyze_Return_Statement (N : Node_Id);
101 -- Common processing for simple_ and extended_return_statements
103 procedure Analyze_Function_Return (N : Node_Id);
104 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
105 -- applies to a [generic] function.
107 procedure Analyze_Return_Type (N : Node_Id);
108 -- Subsidiary to Process_Formals: analyze subtype mark in function
109 -- specification, in a context where the formals are visible and hide
112 procedure Analyze_Subprogram_Body_Helper (N : Node_Id);
113 -- Does all the real work of Analyze_Subprogram_Body
115 procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id);
116 -- Analyze a generic subprogram body. N is the body to be analyzed, and
117 -- Gen_Id is the defining entity Id for the corresponding spec.
119 procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id);
120 -- If a subprogram has pragma Inline and inlining is active, use generic
121 -- machinery to build an unexpanded body for the subprogram. This body is
122 -- subsequently used for inline expansions at call sites. If subprogram can
123 -- be inlined (depending on size and nature of local declarations) this
124 -- function returns true. Otherwise subprogram body is treated normally.
125 -- If proper warnings are enabled and the subprogram contains a construct
126 -- that cannot be inlined, the offending construct is flagged accordingly.
128 procedure Check_Conformance
131 Ctype : Conformance_Type;
133 Conforms : out Boolean;
134 Err_Loc : Node_Id := Empty;
135 Get_Inst : Boolean := False;
136 Skip_Controlling_Formals : Boolean := False);
137 -- Given two entities, this procedure checks that the profiles associated
138 -- with these entities meet the conformance criterion given by the third
139 -- parameter. If they conform, Conforms is set True and control returns
140 -- to the caller. If they do not conform, Conforms is set to False, and
141 -- in addition, if Errmsg is True on the call, proper messages are output
142 -- to complain about the conformance failure. If Err_Loc is non_Empty
143 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
144 -- error messages are placed on the appropriate part of the construct
145 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
146 -- against a formal access-to-subprogram type so Get_Instance_Of must
149 procedure Check_Subprogram_Order (N : Node_Id);
150 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
151 -- the alpha ordering rule for N if this ordering requirement applicable.
153 procedure Check_Returns
157 Proc : Entity_Id := Empty);
158 -- Called to check for missing return statements in a function body, or for
159 -- returns present in a procedure body which has No_Return set. HSS is the
160 -- handled statement sequence for the subprogram body. This procedure
161 -- checks all flow paths to make sure they either have return (Mode = 'F',
162 -- used for functions) or do not have a return (Mode = 'P', used for
163 -- No_Return procedures). The flag Err is set if there are any control
164 -- paths not explicitly terminated by a return in the function case, and is
165 -- True otherwise. Proc is the entity for the procedure case and is used
166 -- in posting the warning message.
168 procedure Enter_Overloaded_Entity (S : Entity_Id);
169 -- This procedure makes S, a new overloaded entity, into the first visible
170 -- entity with that name.
172 procedure Install_Entity (E : Entity_Id);
173 -- Make single entity visible. Used for generic formals as well
175 function Is_Non_Overriding_Operation
177 New_E : Entity_Id) return Boolean;
178 -- Enforce the rule given in 12.3(18): a private operation in an instance
179 -- overrides an inherited operation only if the corresponding operation
180 -- was overriding in the generic. This can happen for primitive operations
181 -- of types derived (in the generic unit) from formal private or formal
184 procedure Make_Inequality_Operator (S : Entity_Id);
185 -- Create the declaration for an inequality operator that is implicitly
186 -- created by a user-defined equality operator that yields a boolean.
188 procedure May_Need_Actuals (Fun : Entity_Id);
189 -- Flag functions that can be called without parameters, i.e. those that
190 -- have no parameters, or those for which defaults exist for all parameters
192 procedure Process_PPCs
195 Body_Id : Entity_Id);
196 -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post
197 -- conditions for the body and assembling and inserting the _postconditions
198 -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are
199 -- the entities for the body and separate spec (if there is no separate
200 -- spec, Spec_Id is Empty).
202 procedure Set_Formal_Validity (Formal_Id : Entity_Id);
203 -- Formal_Id is an formal parameter entity. This procedure deals with
204 -- setting the proper validity status for this entity, which depends on
205 -- the kind of parameter and the validity checking mode.
207 ------------------------------
208 -- Analyze_Return_Statement --
209 ------------------------------
211 procedure Analyze_Return_Statement (N : Node_Id) is
213 pragma Assert (Nkind_In (N, N_Simple_Return_Statement,
214 N_Extended_Return_Statement));
216 Returns_Object : constant Boolean :=
217 Nkind (N) = N_Extended_Return_Statement
219 (Nkind (N) = N_Simple_Return_Statement
220 and then Present (Expression (N)));
221 -- True if we're returning something; that is, "return <expression>;"
222 -- or "return Result : T [:= ...]". False for "return;". Used for error
223 -- checking: If Returns_Object is True, N should apply to a function
224 -- body; otherwise N should apply to a procedure body, entry body,
225 -- accept statement, or extended return statement.
227 function Find_What_It_Applies_To return Entity_Id;
228 -- Find the entity representing the innermost enclosing body, accept
229 -- statement, or extended return statement. If the result is a callable
230 -- construct or extended return statement, then this will be the value
231 -- of the Return_Applies_To attribute. Otherwise, the program is
232 -- illegal. See RM-6.5(4/2).
234 -----------------------------
235 -- Find_What_It_Applies_To --
236 -----------------------------
238 function Find_What_It_Applies_To return Entity_Id is
239 Result : Entity_Id := Empty;
242 -- Loop outward through the Scope_Stack, skipping blocks and loops
244 for J in reverse 0 .. Scope_Stack.Last loop
245 Result := Scope_Stack.Table (J).Entity;
246 exit when Ekind (Result) /= E_Block and then
247 Ekind (Result) /= E_Loop;
250 pragma Assert (Present (Result));
252 end Find_What_It_Applies_To;
254 -- Local declarations
256 Scope_Id : constant Entity_Id := Find_What_It_Applies_To;
257 Kind : constant Entity_Kind := Ekind (Scope_Id);
258 Loc : constant Source_Ptr := Sloc (N);
259 Stm_Entity : constant Entity_Id :=
261 (E_Return_Statement, Current_Scope, Loc, 'R');
263 -- Start of processing for Analyze_Return_Statement
266 Set_Return_Statement_Entity (N, Stm_Entity);
268 Set_Etype (Stm_Entity, Standard_Void_Type);
269 Set_Return_Applies_To (Stm_Entity, Scope_Id);
271 -- Place Return entity on scope stack, to simplify enforcement of 6.5
272 -- (4/2): an inner return statement will apply to this extended return.
274 if Nkind (N) = N_Extended_Return_Statement then
275 Push_Scope (Stm_Entity);
278 -- Check that pragma No_Return is obeyed. Don't complain about the
279 -- implicitly-generated return that is placed at the end.
281 if No_Return (Scope_Id) and then Comes_From_Source (N) then
282 Error_Msg_N ("RETURN statement not allowed (No_Return)", N);
285 -- Warn on any unassigned OUT parameters if in procedure
287 if Ekind (Scope_Id) = E_Procedure then
288 Warn_On_Unassigned_Out_Parameter (N, Scope_Id);
291 -- Check that functions return objects, and other things do not
293 if Kind = E_Function or else Kind = E_Generic_Function then
294 if not Returns_Object then
295 Error_Msg_N ("missing expression in return from function", N);
298 elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then
299 if Returns_Object then
300 Error_Msg_N ("procedure cannot return value (use function)", N);
303 elsif Kind = E_Entry or else Kind = E_Entry_Family then
304 if Returns_Object then
305 if Is_Protected_Type (Scope (Scope_Id)) then
306 Error_Msg_N ("entry body cannot return value", N);
308 Error_Msg_N ("accept statement cannot return value", N);
312 elsif Kind = E_Return_Statement then
314 -- We are nested within another return statement, which must be an
315 -- extended_return_statement.
317 if Returns_Object then
319 ("extended_return_statement cannot return value; " &
320 "use `""RETURN;""`", N);
324 Error_Msg_N ("illegal context for return statement", N);
327 if Kind = E_Function or else Kind = E_Generic_Function then
328 Analyze_Function_Return (N);
331 if Nkind (N) = N_Extended_Return_Statement then
335 Kill_Current_Values (Last_Assignment_Only => True);
336 Check_Unreachable_Code (N);
337 end Analyze_Return_Statement;
339 ---------------------------------------------
340 -- Analyze_Abstract_Subprogram_Declaration --
341 ---------------------------------------------
343 procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is
344 Designator : constant Entity_Id :=
345 Analyze_Subprogram_Specification (Specification (N));
346 Scop : constant Entity_Id := Current_Scope;
349 Generate_Definition (Designator);
350 Set_Is_Abstract_Subprogram (Designator);
351 New_Overloaded_Entity (Designator);
352 Check_Delayed_Subprogram (Designator);
354 Set_Categorization_From_Scope (Designator, Scop);
356 if Ekind (Scope (Designator)) = E_Protected_Type then
358 ("abstract subprogram not allowed in protected type", N);
360 -- Issue a warning if the abstract subprogram is neither a dispatching
361 -- operation nor an operation that overrides an inherited subprogram or
362 -- predefined operator, since this most likely indicates a mistake.
364 elsif Warn_On_Redundant_Constructs
365 and then not Is_Dispatching_Operation (Designator)
366 and then not Is_Overriding_Operation (Designator)
367 and then (not Is_Operator_Symbol_Name (Chars (Designator))
368 or else Scop /= Scope (Etype (First_Formal (Designator))))
371 ("?abstract subprogram is not dispatching or overriding", N);
374 Generate_Reference_To_Formals (Designator);
375 Check_Eliminated (Designator);
376 end Analyze_Abstract_Subprogram_Declaration;
378 ----------------------------------------
379 -- Analyze_Extended_Return_Statement --
380 ----------------------------------------
382 procedure Analyze_Extended_Return_Statement (N : Node_Id) is
384 Analyze_Return_Statement (N);
385 end Analyze_Extended_Return_Statement;
387 ----------------------------
388 -- Analyze_Function_Call --
389 ----------------------------
391 procedure Analyze_Function_Call (N : Node_Id) is
392 P : constant Node_Id := Name (N);
393 L : constant List_Id := Parameter_Associations (N);
399 -- A call of the form A.B (X) may be an Ada05 call, which is rewritten
400 -- as B (A, X). If the rewriting is successful, the call has been
401 -- analyzed and we just return.
403 if Nkind (P) = N_Selected_Component
404 and then Name (N) /= P
405 and then Is_Rewrite_Substitution (N)
406 and then Present (Etype (N))
411 -- If error analyzing name, then set Any_Type as result type and return
413 if Etype (P) = Any_Type then
414 Set_Etype (N, Any_Type);
418 -- Otherwise analyze the parameters
422 while Present (Actual) loop
424 Check_Parameterless_Call (Actual);
430 end Analyze_Function_Call;
432 -----------------------------
433 -- Analyze_Function_Return --
434 -----------------------------
436 procedure Analyze_Function_Return (N : Node_Id) is
437 Loc : constant Source_Ptr := Sloc (N);
438 Stm_Entity : constant Entity_Id := Return_Statement_Entity (N);
439 Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity);
441 R_Type : constant Entity_Id := Etype (Scope_Id);
442 -- Function result subtype
444 procedure Check_Limited_Return (Expr : Node_Id);
445 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
446 -- limited types. Used only for simple return statements.
447 -- Expr is the expression returned.
449 procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id);
450 -- Check that the return_subtype_indication properly matches the result
451 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
453 --------------------------
454 -- Check_Limited_Return --
455 --------------------------
457 procedure Check_Limited_Return (Expr : Node_Id) is
459 -- Ada 2005 (AI-318-02): Return-by-reference types have been
460 -- removed and replaced by anonymous access results. This is an
461 -- incompatibility with Ada 95. Not clear whether this should be
462 -- enforced yet or perhaps controllable with special switch. ???
464 if Is_Limited_Type (R_Type)
465 and then Comes_From_Source (N)
466 and then not In_Instance_Body
467 and then not OK_For_Limited_Init_In_05 (R_Type, Expr)
471 if Ada_Version >= Ada_05
472 and then not Debug_Flag_Dot_L
473 and then not GNAT_Mode
476 ("(Ada 2005) cannot copy object of a limited type " &
477 "(RM-2005 6.5(5.5/2))", Expr);
478 if Is_Inherently_Limited_Type (R_Type) then
480 ("\return by reference not permitted in Ada 2005", Expr);
483 -- Warn in Ada 95 mode, to give folks a heads up about this
486 -- In GNAT mode, this is just a warning, to allow it to be
487 -- evilly turned off. Otherwise it is a real error.
489 elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then
490 if Is_Inherently_Limited_Type (R_Type) then
492 ("return by reference not permitted in Ada 2005 " &
493 "(RM-2005 6.5(5.5/2))?", Expr);
496 ("cannot copy object of a limited type in Ada 2005 " &
497 "(RM-2005 6.5(5.5/2))?", Expr);
500 -- Ada 95 mode, compatibility warnings disabled
503 return; -- skip continuation messages below
507 ("\consider switching to return of access type", Expr);
508 Explain_Limited_Type (R_Type, Expr);
510 end Check_Limited_Return;
512 -------------------------------------
513 -- Check_Return_Subtype_Indication --
514 -------------------------------------
516 procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is
517 Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl);
518 R_Stm_Type : constant Entity_Id := Etype (Return_Obj);
519 -- Subtype given in the extended return statement;
520 -- this must match R_Type.
522 Subtype_Ind : constant Node_Id :=
523 Object_Definition (Original_Node (Obj_Decl));
525 R_Type_Is_Anon_Access :
527 Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type
529 Ekind (R_Type) = E_Anonymous_Access_Protected_Subprogram_Type
531 Ekind (R_Type) = E_Anonymous_Access_Type;
532 -- True if return type of the function is an anonymous access type
533 -- Can't we make Is_Anonymous_Access_Type in einfo ???
535 R_Stm_Type_Is_Anon_Access :
537 Ekind (R_Stm_Type) = E_Anonymous_Access_Subprogram_Type
539 Ekind (R_Stm_Type) = E_Anonymous_Access_Protected_Subprogram_Type
541 Ekind (R_Stm_Type) = E_Anonymous_Access_Type;
542 -- True if type of the return object is an anonymous access type
545 -- First, avoid cascade errors:
547 if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then
551 -- "return access T" case; check that the return statement also has
552 -- "access T", and that the subtypes statically match:
553 -- if this is an access to subprogram the signatures must match.
555 if R_Type_Is_Anon_Access then
556 if R_Stm_Type_Is_Anon_Access then
558 Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type
560 if Base_Type (Designated_Type (R_Stm_Type)) /=
561 Base_Type (Designated_Type (R_Type))
562 or else not Subtypes_Statically_Match (R_Stm_Type, R_Type)
565 ("subtype must statically match function result subtype",
566 Subtype_Mark (Subtype_Ind));
570 -- For two anonymous access to subprogram types, the
571 -- types themselves must be type conformant.
573 if not Conforming_Types
574 (R_Stm_Type, R_Type, Fully_Conformant)
577 ("subtype must statically match function result subtype",
583 Error_Msg_N ("must use anonymous access type", Subtype_Ind);
586 -- Subtype indication case: check that the return object's type is
587 -- covered by the result type, and that the subtypes statically match
588 -- when the result subtype is constrained. Also handle record types
589 -- with unknown discriminants for which we have built the underlying
590 -- record view. Coverage is needed to allow specific-type return
591 -- objects when the result type is class-wide (see AI05-32).
593 elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type))
594 or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type))
598 Underlying_Record_View (Base_Type (R_Stm_Type))))
600 -- A null exclusion may be present on the return type, on the
601 -- function specification, on the object declaration or on the
604 if Is_Access_Type (R_Type)
606 (Can_Never_Be_Null (R_Type)
607 or else Null_Exclusion_Present (Parent (Scope_Id))) /=
608 Can_Never_Be_Null (R_Stm_Type)
611 ("subtype must statically match function result subtype",
615 if Is_Constrained (R_Type) then
616 if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then
618 ("subtype must statically match function result subtype",
623 elsif Etype (Base_Type (R_Type)) = R_Stm_Type
624 and then Is_Null_Extension (Base_Type (R_Type))
630 ("wrong type for return_subtype_indication", Subtype_Ind);
632 end Check_Return_Subtype_Indication;
634 ---------------------
635 -- Local Variables --
636 ---------------------
640 -- Start of processing for Analyze_Function_Return
643 Set_Return_Present (Scope_Id);
645 if Nkind (N) = N_Simple_Return_Statement then
646 Expr := Expression (N);
647 Analyze_And_Resolve (Expr, R_Type);
648 Check_Limited_Return (Expr);
651 -- Analyze parts specific to extended_return_statement:
654 Obj_Decl : constant Node_Id :=
655 Last (Return_Object_Declarations (N));
657 HSS : constant Node_Id := Handled_Statement_Sequence (N);
660 Expr := Expression (Obj_Decl);
662 -- Note: The check for OK_For_Limited_Init will happen in
663 -- Analyze_Object_Declaration; we treat it as a normal
664 -- object declaration.
666 Set_Is_Return_Object (Defining_Identifier (Obj_Decl));
669 Check_Return_Subtype_Indication (Obj_Decl);
671 if Present (HSS) then
674 if Present (Exception_Handlers (HSS)) then
676 -- ???Has_Nested_Block_With_Handler needs to be set.
677 -- Probably by creating an actual N_Block_Statement.
678 -- Probably in Expand.
684 -- Mark the return object as referenced, since the return is an
685 -- implicit reference of the object.
687 Set_Referenced (Defining_Identifier (Obj_Decl));
689 Check_References (Stm_Entity);
693 -- Case of Expr present
697 -- Defend against previous errors
699 and then Nkind (Expr) /= N_Empty
700 and then Present (Etype (Expr))
702 -- Apply constraint check. Note that this is done before the implicit
703 -- conversion of the expression done for anonymous access types to
704 -- ensure correct generation of the null-excluding check associated
705 -- with null-excluding expressions found in return statements.
707 Apply_Constraint_Check (Expr, R_Type);
709 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
710 -- type, apply an implicit conversion of the expression to that type
711 -- to force appropriate static and run-time accessibility checks.
713 if Ada_Version >= Ada_05
714 and then Ekind (R_Type) = E_Anonymous_Access_Type
716 Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr)));
717 Analyze_And_Resolve (Expr, R_Type);
720 -- If the result type is class-wide, then check that the return
721 -- expression's type is not declared at a deeper level than the
722 -- function (RM05-6.5(5.6/2)).
724 if Ada_Version >= Ada_05
725 and then Is_Class_Wide_Type (R_Type)
727 if Type_Access_Level (Etype (Expr)) >
728 Subprogram_Access_Level (Scope_Id)
731 ("level of return expression type is deeper than " &
732 "class-wide function!", Expr);
736 -- Check incorrect use of dynamically tagged expression
738 if Is_Tagged_Type (R_Type) then
739 Check_Dynamically_Tagged_Expression
745 -- ??? A real run-time accessibility check is needed in cases
746 -- involving dereferences of access parameters. For now we just
747 -- check the static cases.
749 if (Ada_Version < Ada_05 or else Debug_Flag_Dot_L)
750 and then Is_Inherently_Limited_Type (Etype (Scope_Id))
751 and then Object_Access_Level (Expr) >
752 Subprogram_Access_Level (Scope_Id)
755 Make_Raise_Program_Error (Loc,
756 Reason => PE_Accessibility_Check_Failed));
760 ("cannot return a local value by reference?", N);
762 ("\& will be raised at run time?",
763 N, Standard_Program_Error);
767 and then Nkind (Parent (Scope_Id)) = N_Function_Specification
768 and then Null_Exclusion_Present (Parent (Scope_Id))
770 Apply_Compile_Time_Constraint_Error
772 Msg => "(Ada 2005) null not allowed for "
773 & "null-excluding return?",
774 Reason => CE_Null_Not_Allowed);
777 end Analyze_Function_Return;
779 -------------------------------------
780 -- Analyze_Generic_Subprogram_Body --
781 -------------------------------------
783 procedure Analyze_Generic_Subprogram_Body
787 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id);
788 Kind : constant Entity_Kind := Ekind (Gen_Id);
794 -- Copy body and disable expansion while analyzing the generic For a
795 -- stub, do not copy the stub (which would load the proper body), this
796 -- will be done when the proper body is analyzed.
798 if Nkind (N) /= N_Subprogram_Body_Stub then
799 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
804 Spec := Specification (N);
806 -- Within the body of the generic, the subprogram is callable, and
807 -- behaves like the corresponding non-generic unit.
809 Body_Id := Defining_Entity (Spec);
811 if Kind = E_Generic_Procedure
812 and then Nkind (Spec) /= N_Procedure_Specification
814 Error_Msg_N ("invalid body for generic procedure ", Body_Id);
817 elsif Kind = E_Generic_Function
818 and then Nkind (Spec) /= N_Function_Specification
820 Error_Msg_N ("invalid body for generic function ", Body_Id);
824 Set_Corresponding_Body (Gen_Decl, Body_Id);
826 if Has_Completion (Gen_Id)
827 and then Nkind (Parent (N)) /= N_Subunit
829 Error_Msg_N ("duplicate generic body", N);
832 Set_Has_Completion (Gen_Id);
835 if Nkind (N) = N_Subprogram_Body_Stub then
836 Set_Ekind (Defining_Entity (Specification (N)), Kind);
838 Set_Corresponding_Spec (N, Gen_Id);
841 if Nkind (Parent (N)) = N_Compilation_Unit then
842 Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N));
845 -- Make generic parameters immediately visible in the body. They are
846 -- needed to process the formals declarations. Then make the formals
847 -- visible in a separate step.
853 First_Ent : Entity_Id;
856 First_Ent := First_Entity (Gen_Id);
859 while Present (E) and then not Is_Formal (E) loop
864 Set_Use (Generic_Formal_Declarations (Gen_Decl));
866 -- Now generic formals are visible, and the specification can be
867 -- analyzed, for subsequent conformance check.
869 Body_Id := Analyze_Subprogram_Specification (Spec);
871 -- Make formal parameters visible
875 -- E is the first formal parameter, we loop through the formals
876 -- installing them so that they will be visible.
878 Set_First_Entity (Gen_Id, E);
879 while Present (E) loop
885 -- Visible generic entity is callable within its own body
887 Set_Ekind (Gen_Id, Ekind (Body_Id));
888 Set_Ekind (Body_Id, E_Subprogram_Body);
889 Set_Convention (Body_Id, Convention (Gen_Id));
890 Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id));
891 Set_Scope (Body_Id, Scope (Gen_Id));
892 Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id);
894 if Nkind (N) = N_Subprogram_Body_Stub then
896 -- No body to analyze, so restore state of generic unit
898 Set_Ekind (Gen_Id, Kind);
899 Set_Ekind (Body_Id, Kind);
901 if Present (First_Ent) then
902 Set_First_Entity (Gen_Id, First_Ent);
909 -- If this is a compilation unit, it must be made visible explicitly,
910 -- because the compilation of the declaration, unlike other library
911 -- unit declarations, does not. If it is not a unit, the following
912 -- is redundant but harmless.
914 Set_Is_Immediately_Visible (Gen_Id);
915 Reference_Body_Formals (Gen_Id, Body_Id);
917 if Is_Child_Unit (Gen_Id) then
918 Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False);
921 Set_Actual_Subtypes (N, Current_Scope);
922 Process_PPCs (N, Gen_Id, Body_Id);
924 -- If the generic unit carries pre- or post-conditions, copy them
925 -- to the original generic tree, so that they are properly added
926 -- to any instantiation.
929 Orig : constant Node_Id := Original_Node (N);
933 Cond := First (Declarations (N));
934 while Present (Cond) loop
935 if Nkind (Cond) = N_Pragma
936 and then Pragma_Name (Cond) = Name_Check
938 Prepend (New_Copy_Tree (Cond), Declarations (Orig));
940 elsif Nkind (Cond) = N_Pragma
941 and then Pragma_Name (Cond) = Name_Postcondition
943 Set_Ekind (Defining_Entity (Orig), Ekind (Gen_Id));
944 Prepend (New_Copy_Tree (Cond), Declarations (Orig));
953 Analyze_Declarations (Declarations (N));
955 Analyze (Handled_Statement_Sequence (N));
957 Save_Global_References (Original_Node (N));
959 -- Prior to exiting the scope, include generic formals again (if any
960 -- are present) in the set of local entities.
962 if Present (First_Ent) then
963 Set_First_Entity (Gen_Id, First_Ent);
966 Check_References (Gen_Id);
969 Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope);
971 Check_Subprogram_Order (N);
973 -- Outside of its body, unit is generic again
975 Set_Ekind (Gen_Id, Kind);
976 Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False);
979 Style.Check_Identifier (Body_Id, Gen_Id);
982 end Analyze_Generic_Subprogram_Body;
984 -----------------------------
985 -- Analyze_Operator_Symbol --
986 -----------------------------
988 -- An operator symbol such as "+" or "and" may appear in context where the
989 -- literal denotes an entity name, such as "+"(x, y) or in context when it
990 -- is just a string, as in (conjunction = "or"). In these cases the parser
991 -- generates this node, and the semantics does the disambiguation. Other
992 -- such case are actuals in an instantiation, the generic unit in an
993 -- instantiation, and pragma arguments.
995 procedure Analyze_Operator_Symbol (N : Node_Id) is
996 Par : constant Node_Id := Parent (N);
999 if (Nkind (Par) = N_Function_Call
1000 and then N = Name (Par))
1001 or else Nkind (Par) = N_Function_Instantiation
1002 or else (Nkind (Par) = N_Indexed_Component
1003 and then N = Prefix (Par))
1004 or else (Nkind (Par) = N_Pragma_Argument_Association
1005 and then not Is_Pragma_String_Literal (Par))
1006 or else Nkind (Par) = N_Subprogram_Renaming_Declaration
1007 or else (Nkind (Par) = N_Attribute_Reference
1008 and then Attribute_Name (Par) /= Name_Value)
1010 Find_Direct_Name (N);
1013 Change_Operator_Symbol_To_String_Literal (N);
1016 end Analyze_Operator_Symbol;
1018 -----------------------------------
1019 -- Analyze_Parameter_Association --
1020 -----------------------------------
1022 procedure Analyze_Parameter_Association (N : Node_Id) is
1024 Analyze (Explicit_Actual_Parameter (N));
1025 end Analyze_Parameter_Association;
1027 ----------------------------
1028 -- Analyze_Procedure_Call --
1029 ----------------------------
1031 procedure Analyze_Procedure_Call (N : Node_Id) is
1032 Loc : constant Source_Ptr := Sloc (N);
1033 P : constant Node_Id := Name (N);
1034 Actuals : constant List_Id := Parameter_Associations (N);
1038 procedure Analyze_Call_And_Resolve;
1039 -- Do Analyze and Resolve calls for procedure call
1041 ------------------------------
1042 -- Analyze_Call_And_Resolve --
1043 ------------------------------
1045 procedure Analyze_Call_And_Resolve is
1047 if Nkind (N) = N_Procedure_Call_Statement then
1049 Resolve (N, Standard_Void_Type);
1053 end Analyze_Call_And_Resolve;
1055 -- Start of processing for Analyze_Procedure_Call
1058 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1059 -- a procedure call or an entry call. The prefix may denote an access
1060 -- to subprogram type, in which case an implicit dereference applies.
1061 -- If the prefix is an indexed component (without implicit dereference)
1062 -- then the construct denotes a call to a member of an entire family.
1063 -- If the prefix is a simple name, it may still denote a call to a
1064 -- parameterless member of an entry family. Resolution of these various
1065 -- interpretations is delicate.
1069 -- If this is a call of the form Obj.Op, the call may have been
1070 -- analyzed and possibly rewritten into a block, in which case
1073 if Analyzed (N) then
1077 -- If error analyzing prefix, then set Any_Type as result and return
1079 if Etype (P) = Any_Type then
1080 Set_Etype (N, Any_Type);
1084 -- Otherwise analyze the parameters
1086 if Present (Actuals) then
1087 Actual := First (Actuals);
1089 while Present (Actual) loop
1091 Check_Parameterless_Call (Actual);
1096 -- Special processing for Elab_Spec and Elab_Body calls
1098 if Nkind (P) = N_Attribute_Reference
1099 and then (Attribute_Name (P) = Name_Elab_Spec
1100 or else Attribute_Name (P) = Name_Elab_Body)
1102 if Present (Actuals) then
1104 ("no parameters allowed for this call", First (Actuals));
1108 Set_Etype (N, Standard_Void_Type);
1111 elsif Is_Entity_Name (P)
1112 and then Is_Record_Type (Etype (Entity (P)))
1113 and then Remote_AST_I_Dereference (P)
1117 elsif Is_Entity_Name (P)
1118 and then Ekind (Entity (P)) /= E_Entry_Family
1120 if Is_Access_Type (Etype (P))
1121 and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type
1122 and then No (Actuals)
1123 and then Comes_From_Source (N)
1125 Error_Msg_N ("missing explicit dereference in call", N);
1128 Analyze_Call_And_Resolve;
1130 -- If the prefix is the simple name of an entry family, this is
1131 -- a parameterless call from within the task body itself.
1133 elsif Is_Entity_Name (P)
1134 and then Nkind (P) = N_Identifier
1135 and then Ekind (Entity (P)) = E_Entry_Family
1136 and then Present (Actuals)
1137 and then No (Next (First (Actuals)))
1139 -- Can be call to parameterless entry family. What appears to be the
1140 -- sole argument is in fact the entry index. Rewrite prefix of node
1141 -- accordingly. Source representation is unchanged by this
1145 Make_Indexed_Component (Loc,
1147 Make_Selected_Component (Loc,
1148 Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc),
1149 Selector_Name => New_Occurrence_Of (Entity (P), Loc)),
1150 Expressions => Actuals);
1151 Set_Name (N, New_N);
1152 Set_Etype (New_N, Standard_Void_Type);
1153 Set_Parameter_Associations (N, No_List);
1154 Analyze_Call_And_Resolve;
1156 elsif Nkind (P) = N_Explicit_Dereference then
1157 if Ekind (Etype (P)) = E_Subprogram_Type then
1158 Analyze_Call_And_Resolve;
1160 Error_Msg_N ("expect access to procedure in call", P);
1163 -- The name can be a selected component or an indexed component that
1164 -- yields an access to subprogram. Such a prefix is legal if the call
1165 -- has parameter associations.
1167 elsif Is_Access_Type (Etype (P))
1168 and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type
1170 if Present (Actuals) then
1171 Analyze_Call_And_Resolve;
1173 Error_Msg_N ("missing explicit dereference in call ", N);
1176 -- If not an access to subprogram, then the prefix must resolve to the
1177 -- name of an entry, entry family, or protected operation.
1179 -- For the case of a simple entry call, P is a selected component where
1180 -- the prefix is the task and the selector name is the entry. A call to
1181 -- a protected procedure will have the same syntax. If the protected
1182 -- object contains overloaded operations, the entity may appear as a
1183 -- function, the context will select the operation whose type is Void.
1185 elsif Nkind (P) = N_Selected_Component
1186 and then (Ekind (Entity (Selector_Name (P))) = E_Entry
1188 Ekind (Entity (Selector_Name (P))) = E_Procedure
1190 Ekind (Entity (Selector_Name (P))) = E_Function)
1192 Analyze_Call_And_Resolve;
1194 elsif Nkind (P) = N_Selected_Component
1195 and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family
1196 and then Present (Actuals)
1197 and then No (Next (First (Actuals)))
1199 -- Can be call to parameterless entry family. What appears to be the
1200 -- sole argument is in fact the entry index. Rewrite prefix of node
1201 -- accordingly. Source representation is unchanged by this
1205 Make_Indexed_Component (Loc,
1206 Prefix => New_Copy (P),
1207 Expressions => Actuals);
1208 Set_Name (N, New_N);
1209 Set_Etype (New_N, Standard_Void_Type);
1210 Set_Parameter_Associations (N, No_List);
1211 Analyze_Call_And_Resolve;
1213 -- For the case of a reference to an element of an entry family, P is
1214 -- an indexed component whose prefix is a selected component (task and
1215 -- entry family), and whose index is the entry family index.
1217 elsif Nkind (P) = N_Indexed_Component
1218 and then Nkind (Prefix (P)) = N_Selected_Component
1219 and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family
1221 Analyze_Call_And_Resolve;
1223 -- If the prefix is the name of an entry family, it is a call from
1224 -- within the task body itself.
1226 elsif Nkind (P) = N_Indexed_Component
1227 and then Nkind (Prefix (P)) = N_Identifier
1228 and then Ekind (Entity (Prefix (P))) = E_Entry_Family
1231 Make_Selected_Component (Loc,
1232 Prefix => New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc),
1233 Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc));
1234 Rewrite (Prefix (P), New_N);
1236 Analyze_Call_And_Resolve;
1238 -- Anything else is an error
1241 Error_Msg_N ("invalid procedure or entry call", N);
1243 end Analyze_Procedure_Call;
1245 -------------------------------------
1246 -- Analyze_Simple_Return_Statement --
1247 -------------------------------------
1249 procedure Analyze_Simple_Return_Statement (N : Node_Id) is
1251 if Present (Expression (N)) then
1252 Mark_Coextensions (N, Expression (N));
1255 Analyze_Return_Statement (N);
1256 end Analyze_Simple_Return_Statement;
1258 -------------------------
1259 -- Analyze_Return_Type --
1260 -------------------------
1262 procedure Analyze_Return_Type (N : Node_Id) is
1263 Designator : constant Entity_Id := Defining_Entity (N);
1264 Typ : Entity_Id := Empty;
1267 -- Normal case where result definition does not indicate an error
1269 if Result_Definition (N) /= Error then
1270 if Nkind (Result_Definition (N)) = N_Access_Definition then
1272 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1275 AD : constant Node_Id :=
1276 Access_To_Subprogram_Definition (Result_Definition (N));
1278 if Present (AD) and then Protected_Present (AD) then
1279 Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N);
1281 Typ := Access_Definition (N, Result_Definition (N));
1285 Set_Parent (Typ, Result_Definition (N));
1286 Set_Is_Local_Anonymous_Access (Typ);
1287 Set_Etype (Designator, Typ);
1289 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1291 Null_Exclusion_Static_Checks (N);
1293 -- Subtype_Mark case
1296 Find_Type (Result_Definition (N));
1297 Typ := Entity (Result_Definition (N));
1298 Set_Etype (Designator, Typ);
1300 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1302 Null_Exclusion_Static_Checks (N);
1304 -- If a null exclusion is imposed on the result type, then create
1305 -- a null-excluding itype (an access subtype) and use it as the
1306 -- function's Etype. Note that the null exclusion checks are done
1307 -- right before this, because they don't get applied to types that
1308 -- do not come from source.
1310 if Is_Access_Type (Typ)
1311 and then Null_Exclusion_Present (N)
1313 Set_Etype (Designator,
1314 Create_Null_Excluding_Itype
1317 Scope_Id => Scope (Current_Scope)));
1319 -- The new subtype must be elaborated before use because
1320 -- it is visible outside of the function. However its base
1321 -- type may not be frozen yet, so the reference that will
1322 -- force elaboration must be attached to the freezing of
1325 -- If the return specification appears on a proper body,
1326 -- the subtype will have been created already on the spec.
1328 if Is_Frozen (Typ) then
1329 if Nkind (Parent (N)) = N_Subprogram_Body
1330 and then Nkind (Parent (Parent (N))) = N_Subunit
1334 Build_Itype_Reference (Etype (Designator), Parent (N));
1338 Ensure_Freeze_Node (Typ);
1341 IR : constant Node_Id := Make_Itype_Reference (Sloc (N));
1343 Set_Itype (IR, Etype (Designator));
1344 Append_Freeze_Actions (Typ, New_List (IR));
1349 Set_Etype (Designator, Typ);
1352 if Ekind (Typ) = E_Incomplete_Type
1353 and then Is_Value_Type (Typ)
1357 elsif Ekind (Typ) = E_Incomplete_Type
1358 or else (Is_Class_Wide_Type (Typ)
1360 Ekind (Root_Type (Typ)) = E_Incomplete_Type)
1363 ("invalid use of incomplete type&", Designator, Typ);
1367 -- Case where result definition does indicate an error
1370 Set_Etype (Designator, Any_Type);
1372 end Analyze_Return_Type;
1374 -----------------------------
1375 -- Analyze_Subprogram_Body --
1376 -----------------------------
1378 procedure Analyze_Subprogram_Body (N : Node_Id) is
1379 Loc : constant Source_Ptr := Sloc (N);
1380 Body_Spec : constant Node_Id := Specification (N);
1381 Body_Id : constant Entity_Id := Defining_Entity (Body_Spec);
1384 if Debug_Flag_C then
1385 Write_Str ("==> subprogram body ");
1386 Write_Name (Chars (Body_Id));
1387 Write_Str (" from ");
1388 Write_Location (Loc);
1393 Trace_Scope (N, Body_Id, " Analyze subprogram: ");
1395 -- The real work is split out into the helper, so it can do "return;"
1396 -- without skipping the debug output:
1398 Analyze_Subprogram_Body_Helper (N);
1400 if Debug_Flag_C then
1402 Write_Str ("<== subprogram body ");
1403 Write_Name (Chars (Body_Id));
1404 Write_Str (" from ");
1405 Write_Location (Loc);
1408 end Analyze_Subprogram_Body;
1410 ------------------------------------
1411 -- Analyze_Subprogram_Body_Helper --
1412 ------------------------------------
1414 -- This procedure is called for regular subprogram bodies, generic bodies,
1415 -- and for subprogram stubs of both kinds. In the case of stubs, only the
1416 -- specification matters, and is used to create a proper declaration for
1417 -- the subprogram, or to perform conformance checks.
1419 procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is
1420 Loc : constant Source_Ptr := Sloc (N);
1421 Body_Deleted : constant Boolean := False;
1422 Body_Spec : constant Node_Id := Specification (N);
1423 Body_Id : Entity_Id := Defining_Entity (Body_Spec);
1424 Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id);
1425 Conformant : Boolean;
1427 Missing_Ret : Boolean;
1429 Prot_Typ : Entity_Id := Empty;
1430 Spec_Id : Entity_Id;
1431 Spec_Decl : Node_Id := Empty;
1433 Last_Real_Spec_Entity : Entity_Id := Empty;
1434 -- When we analyze a separate spec, the entity chain ends up containing
1435 -- the formals, as well as any itypes generated during analysis of the
1436 -- default expressions for parameters, or the arguments of associated
1437 -- precondition/postcondition pragmas (which are analyzed in the context
1438 -- of the spec since they have visibility on formals).
1440 -- These entities belong with the spec and not the body. However we do
1441 -- the analysis of the body in the context of the spec (again to obtain
1442 -- visibility to the formals), and all the entities generated during
1443 -- this analysis end up also chained to the entity chain of the spec.
1444 -- But they really belong to the body, and there is circuitry to move
1445 -- them from the spec to the body.
1447 -- However, when we do this move, we don't want to move the real spec
1448 -- entities (first para above) to the body. The Last_Real_Spec_Entity
1449 -- variable points to the last real spec entity, so we only move those
1450 -- chained beyond that point. It is initialized to Empty to deal with
1451 -- the case where there is no separate spec.
1453 procedure Check_Anonymous_Return;
1454 -- Ada 2005: if a function returns an access type that denotes a task,
1455 -- or a type that contains tasks, we must create a master entity for
1456 -- the anonymous type, which typically will be used in an allocator
1457 -- in the body of the function.
1459 procedure Check_Inline_Pragma (Spec : in out Node_Id);
1460 -- Look ahead to recognize a pragma that may appear after the body.
1461 -- If there is a previous spec, check that it appears in the same
1462 -- declarative part. If the pragma is Inline_Always, perform inlining
1463 -- unconditionally, otherwise only if Front_End_Inlining is requested.
1464 -- If the body acts as a spec, and inlining is required, we create a
1465 -- subprogram declaration for it, in order to attach the body to inline.
1466 -- If pragma does not appear after the body, check whether there is
1467 -- an inline pragma before any local declarations.
1469 function Disambiguate_Spec return Entity_Id;
1470 -- When a primitive is declared between the private view and the full
1471 -- view of a concurrent type which implements an interface, a special
1472 -- mechanism is used to find the corresponding spec of the primitive
1475 function Is_Private_Concurrent_Primitive
1476 (Subp_Id : Entity_Id) return Boolean;
1477 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
1478 -- type that implements an interface and has a private view.
1480 procedure Set_Trivial_Subprogram (N : Node_Id);
1481 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
1482 -- subprogram whose body is being analyzed. N is the statement node
1483 -- causing the flag to be set, if the following statement is a return
1484 -- of an entity, we mark the entity as set in source to suppress any
1485 -- warning on the stylized use of function stubs with a dummy return.
1487 procedure Verify_Overriding_Indicator;
1488 -- If there was a previous spec, the entity has been entered in the
1489 -- current scope previously. If the body itself carries an overriding
1490 -- indicator, check that it is consistent with the known status of the
1493 ----------------------------
1494 -- Check_Anonymous_Return --
1495 ----------------------------
1497 procedure Check_Anonymous_Return is
1503 if Present (Spec_Id) then
1509 if Ekind (Scop) = E_Function
1510 and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type
1511 and then not Is_Thunk (Scop)
1512 and then (Has_Task (Designated_Type (Etype (Scop)))
1514 (Is_Class_Wide_Type (Designated_Type (Etype (Scop)))
1516 Is_Limited_Record (Designated_Type (Etype (Scop)))))
1517 and then Expander_Active
1519 -- Avoid cases with no tasking support
1521 and then RTE_Available (RE_Current_Master)
1522 and then not Restriction_Active (No_Task_Hierarchy)
1525 Make_Object_Declaration (Loc,
1526 Defining_Identifier =>
1527 Make_Defining_Identifier (Loc, Name_uMaster),
1528 Constant_Present => True,
1529 Object_Definition =>
1530 New_Reference_To (RTE (RE_Master_Id), Loc),
1532 Make_Explicit_Dereference (Loc,
1533 New_Reference_To (RTE (RE_Current_Master), Loc)));
1535 if Present (Declarations (N)) then
1536 Prepend (Decl, Declarations (N));
1538 Set_Declarations (N, New_List (Decl));
1541 Set_Master_Id (Etype (Scop), Defining_Identifier (Decl));
1542 Set_Has_Master_Entity (Scop);
1544 -- Now mark the containing scope as a task master
1547 while Nkind (Par) /= N_Compilation_Unit loop
1548 Par := Parent (Par);
1549 pragma Assert (Present (Par));
1551 -- If we fall off the top, we are at the outer level, and
1552 -- the environment task is our effective master, so nothing
1556 (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body)
1558 Set_Is_Task_Master (Par, True);
1563 end Check_Anonymous_Return;
1565 -------------------------
1566 -- Check_Inline_Pragma --
1567 -------------------------
1569 procedure Check_Inline_Pragma (Spec : in out Node_Id) is
1573 function Is_Inline_Pragma (N : Node_Id) return Boolean;
1574 -- True when N is a pragma Inline or Inline_Always that applies
1575 -- to this subprogram.
1577 -----------------------
1578 -- Is_Inline_Pragma --
1579 -----------------------
1581 function Is_Inline_Pragma (N : Node_Id) return Boolean is
1584 Nkind (N) = N_Pragma
1586 (Pragma_Name (N) = Name_Inline_Always
1589 and then Pragma_Name (N) = Name_Inline))
1592 (Expression (First (Pragma_Argument_Associations (N))))
1594 end Is_Inline_Pragma;
1596 -- Start of processing for Check_Inline_Pragma
1599 if not Expander_Active then
1603 if Is_List_Member (N)
1604 and then Present (Next (N))
1605 and then Is_Inline_Pragma (Next (N))
1609 elsif Nkind (N) /= N_Subprogram_Body_Stub
1610 and then Present (Declarations (N))
1611 and then Is_Inline_Pragma (First (Declarations (N)))
1613 Prag := First (Declarations (N));
1619 if Present (Prag) then
1620 if Present (Spec_Id) then
1621 if List_Containing (N) =
1622 List_Containing (Unit_Declaration_Node (Spec_Id))
1628 -- Create a subprogram declaration, to make treatment uniform
1631 Subp : constant Entity_Id :=
1632 Make_Defining_Identifier (Loc, Chars (Body_Id));
1633 Decl : constant Node_Id :=
1634 Make_Subprogram_Declaration (Loc,
1635 Specification => New_Copy_Tree (Specification (N)));
1637 Set_Defining_Unit_Name (Specification (Decl), Subp);
1639 if Present (First_Formal (Body_Id)) then
1640 Plist := Copy_Parameter_List (Body_Id);
1641 Set_Parameter_Specifications
1642 (Specification (Decl), Plist);
1645 Insert_Before (N, Decl);
1648 Set_Has_Pragma_Inline (Subp);
1650 if Pragma_Name (Prag) = Name_Inline_Always then
1651 Set_Is_Inlined (Subp);
1652 Set_Has_Pragma_Inline_Always (Subp);
1659 end Check_Inline_Pragma;
1661 -----------------------
1662 -- Disambiguate_Spec --
1663 -----------------------
1665 function Disambiguate_Spec return Entity_Id is
1666 Priv_Spec : Entity_Id;
1669 procedure Replace_Types (To_Corresponding : Boolean);
1670 -- Depending on the flag, replace the type of formal parameters of
1671 -- Body_Id if it is a concurrent type implementing interfaces with
1672 -- the corresponding record type or the other way around.
1674 procedure Replace_Types (To_Corresponding : Boolean) is
1676 Formal_Typ : Entity_Id;
1679 Formal := First_Formal (Body_Id);
1680 while Present (Formal) loop
1681 Formal_Typ := Etype (Formal);
1683 -- From concurrent type to corresponding record
1685 if To_Corresponding then
1686 if Is_Concurrent_Type (Formal_Typ)
1687 and then Present (Corresponding_Record_Type (Formal_Typ))
1688 and then Present (Interfaces (
1689 Corresponding_Record_Type (Formal_Typ)))
1692 Corresponding_Record_Type (Formal_Typ));
1695 -- From corresponding record to concurrent type
1698 if Is_Concurrent_Record_Type (Formal_Typ)
1699 and then Present (Interfaces (Formal_Typ))
1702 Corresponding_Concurrent_Type (Formal_Typ));
1706 Next_Formal (Formal);
1710 -- Start of processing for Disambiguate_Spec
1713 -- Try to retrieve the specification of the body as is. All error
1714 -- messages are suppressed because the body may not have a spec in
1715 -- its current state.
1717 Spec_N := Find_Corresponding_Spec (N, False);
1719 -- It is possible that this is the body of a primitive declared
1720 -- between a private and a full view of a concurrent type. The
1721 -- controlling parameter of the spec carries the concurrent type,
1722 -- not the corresponding record type as transformed by Analyze_
1723 -- Subprogram_Specification. In such cases, we undo the change
1724 -- made by the analysis of the specification and try to find the
1727 -- Note that wrappers already have their corresponding specs and
1728 -- bodies set during their creation, so if the candidate spec is
1729 -- a wrapper, then we definitely need to swap all types to their
1730 -- original concurrent status.
1733 or else Is_Primitive_Wrapper (Spec_N)
1735 -- Restore all references of corresponding record types to the
1736 -- original concurrent types.
1738 Replace_Types (To_Corresponding => False);
1739 Priv_Spec := Find_Corresponding_Spec (N, False);
1741 -- The current body truly belongs to a primitive declared between
1742 -- a private and a full view. We leave the modified body as is,
1743 -- and return the true spec.
1745 if Present (Priv_Spec)
1746 and then Is_Private_Primitive (Priv_Spec)
1751 -- In case that this is some sort of error, restore the original
1752 -- state of the body.
1754 Replace_Types (To_Corresponding => True);
1758 end Disambiguate_Spec;
1760 -------------------------------------
1761 -- Is_Private_Concurrent_Primitive --
1762 -------------------------------------
1764 function Is_Private_Concurrent_Primitive
1765 (Subp_Id : Entity_Id) return Boolean
1767 Formal_Typ : Entity_Id;
1770 if Present (First_Formal (Subp_Id)) then
1771 Formal_Typ := Etype (First_Formal (Subp_Id));
1773 if Is_Concurrent_Record_Type (Formal_Typ) then
1774 Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ);
1777 -- The type of the first formal is a concurrent tagged type with
1781 Is_Concurrent_Type (Formal_Typ)
1782 and then Is_Tagged_Type (Formal_Typ)
1783 and then Has_Private_Declaration (Formal_Typ);
1787 end Is_Private_Concurrent_Primitive;
1789 ----------------------------
1790 -- Set_Trivial_Subprogram --
1791 ----------------------------
1793 procedure Set_Trivial_Subprogram (N : Node_Id) is
1794 Nxt : constant Node_Id := Next (N);
1797 Set_Is_Trivial_Subprogram (Body_Id);
1799 if Present (Spec_Id) then
1800 Set_Is_Trivial_Subprogram (Spec_Id);
1804 and then Nkind (Nxt) = N_Simple_Return_Statement
1805 and then No (Next (Nxt))
1806 and then Present (Expression (Nxt))
1807 and then Is_Entity_Name (Expression (Nxt))
1809 Set_Never_Set_In_Source (Entity (Expression (Nxt)), False);
1811 end Set_Trivial_Subprogram;
1813 ---------------------------------
1814 -- Verify_Overriding_Indicator --
1815 ---------------------------------
1817 procedure Verify_Overriding_Indicator is
1819 if Must_Override (Body_Spec) then
1820 if Nkind (Spec_Id) = N_Defining_Operator_Symbol
1821 and then Operator_Matches_Spec (Spec_Id, Spec_Id)
1825 elsif not Is_Overriding_Operation (Spec_Id) then
1827 ("subprogram& is not overriding", Body_Spec, Spec_Id);
1830 elsif Must_Not_Override (Body_Spec) then
1831 if Is_Overriding_Operation (Spec_Id) then
1833 ("subprogram& overrides inherited operation",
1834 Body_Spec, Spec_Id);
1836 elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol
1837 and then Operator_Matches_Spec (Spec_Id, Spec_Id)
1840 ("subprogram & overrides predefined operator ",
1841 Body_Spec, Spec_Id);
1843 -- If this is not a primitive operation or protected subprogram,
1844 -- then the overriding indicator is altogether illegal.
1846 elsif not Is_Primitive (Spec_Id)
1847 and then Ekind (Scope (Spec_Id)) /= E_Protected_Type
1849 Error_Msg_N ("overriding indicator only allowed " &
1850 "if subprogram is primitive",
1854 elsif Style_Check -- ??? incorrect use of Style_Check!
1855 and then Is_Overriding_Operation (Spec_Id)
1857 pragma Assert (Unit_Declaration_Node (Body_Id) = N);
1858 Style.Missing_Overriding (N, Body_Id);
1860 end Verify_Overriding_Indicator;
1862 -- Start of processing for Analyze_Subprogram_Body_Helper
1865 -- Generic subprograms are handled separately. They always have a
1866 -- generic specification. Determine whether current scope has a
1867 -- previous declaration.
1869 -- If the subprogram body is defined within an instance of the same
1870 -- name, the instance appears as a package renaming, and will be hidden
1871 -- within the subprogram.
1873 if Present (Prev_Id)
1874 and then not Is_Overloadable (Prev_Id)
1875 and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration
1876 or else Comes_From_Source (Prev_Id))
1878 if Is_Generic_Subprogram (Prev_Id) then
1880 Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id));
1881 Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id));
1883 Analyze_Generic_Subprogram_Body (N, Spec_Id);
1887 -- Previous entity conflicts with subprogram name. Attempting to
1888 -- enter name will post error.
1890 Enter_Name (Body_Id);
1894 -- Non-generic case, find the subprogram declaration, if one was seen,
1895 -- or enter new overloaded entity in the current scope. If the
1896 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
1897 -- part of the context of one of its subunits. No need to redo the
1900 elsif Prev_Id = Body_Id
1901 and then Has_Completion (Body_Id)
1906 Body_Id := Analyze_Subprogram_Specification (Body_Spec);
1908 if Nkind (N) = N_Subprogram_Body_Stub
1909 or else No (Corresponding_Spec (N))
1911 if Is_Private_Concurrent_Primitive (Body_Id) then
1912 Spec_Id := Disambiguate_Spec;
1914 Spec_Id := Find_Corresponding_Spec (N);
1917 -- If this is a duplicate body, no point in analyzing it
1919 if Error_Posted (N) then
1923 -- A subprogram body should cause freezing of its own declaration,
1924 -- but if there was no previous explicit declaration, then the
1925 -- subprogram will get frozen too late (there may be code within
1926 -- the body that depends on the subprogram having been frozen,
1927 -- such as uses of extra formals), so we force it to be frozen
1928 -- here. Same holds if the body and spec are compilation units.
1929 -- Finally, if the return type is an anonymous access to protected
1930 -- subprogram, it must be frozen before the body because its
1931 -- expansion has generated an equivalent type that is used when
1932 -- elaborating the body.
1934 if No (Spec_Id) then
1935 Freeze_Before (N, Body_Id);
1937 elsif Nkind (Parent (N)) = N_Compilation_Unit then
1938 Freeze_Before (N, Spec_Id);
1940 elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then
1941 Freeze_Before (N, Etype (Body_Id));
1945 Spec_Id := Corresponding_Spec (N);
1949 -- Do not inline any subprogram that contains nested subprograms, since
1950 -- the backend inlining circuit seems to generate uninitialized
1951 -- references in this case. We know this happens in the case of front
1952 -- end ZCX support, but it also appears it can happen in other cases as
1953 -- well. The backend often rejects attempts to inline in the case of
1954 -- nested procedures anyway, so little if anything is lost by this.
1955 -- Note that this is test is for the benefit of the back-end. There is
1956 -- a separate test for front-end inlining that also rejects nested
1959 -- Do not do this test if errors have been detected, because in some
1960 -- error cases, this code blows up, and we don't need it anyway if
1961 -- there have been errors, since we won't get to the linker anyway.
1963 if Comes_From_Source (Body_Id)
1964 and then Serious_Errors_Detected = 0
1968 P_Ent := Scope (P_Ent);
1969 exit when No (P_Ent) or else P_Ent = Standard_Standard;
1971 if Is_Subprogram (P_Ent) then
1972 Set_Is_Inlined (P_Ent, False);
1974 if Comes_From_Source (P_Ent)
1975 and then Has_Pragma_Inline (P_Ent)
1978 ("cannot inline& (nested subprogram)?",
1985 Check_Inline_Pragma (Spec_Id);
1987 -- Deal with special case of a fully private operation in the body of
1988 -- the protected type. We must create a declaration for the subprogram,
1989 -- in order to attach the protected subprogram that will be used in
1990 -- internal calls. We exclude compiler generated bodies from the
1991 -- expander since the issue does not arise for those cases.
1994 and then Comes_From_Source (N)
1995 and then Is_Protected_Type (Current_Scope)
2004 Formal := First_Formal (Body_Id);
2006 -- The protected operation always has at least one formal, namely
2007 -- the object itself, but it is only placed in the parameter list
2008 -- if expansion is enabled.
2011 or else Expander_Active
2013 Plist := Copy_Parameter_List (Body_Id);
2018 if Nkind (Body_Spec) = N_Procedure_Specification then
2020 Make_Procedure_Specification (Loc,
2021 Defining_Unit_Name =>
2022 Make_Defining_Identifier (Sloc (Body_Id),
2023 Chars => Chars (Body_Id)),
2024 Parameter_Specifications => Plist);
2027 Make_Function_Specification (Loc,
2028 Defining_Unit_Name =>
2029 Make_Defining_Identifier (Sloc (Body_Id),
2030 Chars => Chars (Body_Id)),
2031 Parameter_Specifications => Plist,
2032 Result_Definition =>
2033 New_Occurrence_Of (Etype (Body_Id), Loc));
2037 Make_Subprogram_Declaration (Loc,
2038 Specification => New_Spec);
2039 Insert_Before (N, Decl);
2040 Spec_Id := Defining_Unit_Name (New_Spec);
2042 -- Indicate that the entity comes from source, to ensure that
2043 -- cross-reference information is properly generated. The body
2044 -- itself is rewritten during expansion, and the body entity will
2045 -- not appear in calls to the operation.
2047 Set_Comes_From_Source (Spec_Id, True);
2049 Set_Has_Completion (Spec_Id);
2050 Set_Convention (Spec_Id, Convention_Protected);
2054 -- If a separate spec is present, then deal with freezing issues
2056 if Present (Spec_Id) then
2057 Spec_Decl := Unit_Declaration_Node (Spec_Id);
2058 Verify_Overriding_Indicator;
2060 -- In general, the spec will be frozen when we start analyzing the
2061 -- body. However, for internally generated operations, such as
2062 -- wrapper functions for inherited operations with controlling
2063 -- results, the spec may not have been frozen by the time we
2064 -- expand the freeze actions that include the bodies. In particular,
2065 -- extra formals for accessibility or for return-in-place may need
2066 -- to be generated. Freeze nodes, if any, are inserted before the
2069 if not Is_Frozen (Spec_Id)
2070 and then Expander_Active
2072 -- Force the generation of its freezing node to ensure proper
2073 -- management of access types in the backend.
2075 -- This is definitely needed for some cases, but it is not clear
2076 -- why, to be investigated further???
2078 Set_Has_Delayed_Freeze (Spec_Id);
2079 Insert_Actions (N, Freeze_Entity (Spec_Id, Loc));
2083 -- Mark presence of postcondition proc in current scope
2085 if Chars (Body_Id) = Name_uPostconditions then
2086 Set_Has_Postconditions (Current_Scope);
2089 -- Place subprogram on scope stack, and make formals visible. If there
2090 -- is a spec, the visible entity remains that of the spec.
2092 if Present (Spec_Id) then
2093 Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False);
2095 if Is_Child_Unit (Spec_Id) then
2096 Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False);
2100 Style.Check_Identifier (Body_Id, Spec_Id);
2103 Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id));
2104 Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id));
2106 if Is_Abstract_Subprogram (Spec_Id) then
2107 Error_Msg_N ("an abstract subprogram cannot have a body", N);
2111 Set_Convention (Body_Id, Convention (Spec_Id));
2112 Set_Has_Completion (Spec_Id);
2114 if Is_Protected_Type (Scope (Spec_Id)) then
2115 Prot_Typ := Scope (Spec_Id);
2118 -- If this is a body generated for a renaming, do not check for
2119 -- full conformance. The check is redundant, because the spec of
2120 -- the body is a copy of the spec in the renaming declaration,
2121 -- and the test can lead to spurious errors on nested defaults.
2123 if Present (Spec_Decl)
2124 and then not Comes_From_Source (N)
2126 (Nkind (Original_Node (Spec_Decl)) =
2127 N_Subprogram_Renaming_Declaration
2128 or else (Present (Corresponding_Body (Spec_Decl))
2130 Nkind (Unit_Declaration_Node
2131 (Corresponding_Body (Spec_Decl))) =
2132 N_Subprogram_Renaming_Declaration))
2139 Fully_Conformant, True, Conformant, Body_Id);
2142 -- If the body is not fully conformant, we have to decide if we
2143 -- should analyze it or not. If it has a really messed up profile
2144 -- then we probably should not analyze it, since we will get too
2145 -- many bogus messages.
2147 -- Our decision is to go ahead in the non-fully conformant case
2148 -- only if it is at least mode conformant with the spec. Note
2149 -- that the call to Check_Fully_Conformant has issued the proper
2150 -- error messages to complain about the lack of conformance.
2153 and then not Mode_Conformant (Body_Id, Spec_Id)
2159 if Spec_Id /= Body_Id then
2160 Reference_Body_Formals (Spec_Id, Body_Id);
2163 if Nkind (N) /= N_Subprogram_Body_Stub then
2164 Set_Corresponding_Spec (N, Spec_Id);
2166 -- Ada 2005 (AI-345): If the operation is a primitive operation
2167 -- of a concurrent type, the type of the first parameter has been
2168 -- replaced with the corresponding record, which is the proper
2169 -- run-time structure to use. However, within the body there may
2170 -- be uses of the formals that depend on primitive operations
2171 -- of the type (in particular calls in prefixed form) for which
2172 -- we need the original concurrent type. The operation may have
2173 -- several controlling formals, so the replacement must be done
2176 if Comes_From_Source (Spec_Id)
2177 and then Present (First_Entity (Spec_Id))
2178 and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type
2179 and then Is_Tagged_Type (Etype (First_Entity (Spec_Id)))
2181 Present (Interfaces (Etype (First_Entity (Spec_Id))))
2184 (Corresponding_Concurrent_Type
2185 (Etype (First_Entity (Spec_Id))))
2188 Typ : constant Entity_Id := Etype (First_Entity (Spec_Id));
2192 Form := First_Formal (Spec_Id);
2193 while Present (Form) loop
2194 if Etype (Form) = Typ then
2195 Set_Etype (Form, Corresponding_Concurrent_Type (Typ));
2203 -- Make the formals visible, and place subprogram on scope stack.
2204 -- This is also the point at which we set Last_Real_Spec_Entity
2205 -- to mark the entities which will not be moved to the body.
2207 Install_Formals (Spec_Id);
2208 Last_Real_Spec_Entity := Last_Entity (Spec_Id);
2209 Push_Scope (Spec_Id);
2211 -- Make sure that the subprogram is immediately visible. For
2212 -- child units that have no separate spec this is indispensable.
2213 -- Otherwise it is safe albeit redundant.
2215 Set_Is_Immediately_Visible (Spec_Id);
2218 Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id);
2219 Set_Ekind (Body_Id, E_Subprogram_Body);
2220 Set_Scope (Body_Id, Scope (Spec_Id));
2221 Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id));
2223 -- Case of subprogram body with no previous spec
2227 and then Comes_From_Source (Body_Id)
2228 and then not Suppress_Style_Checks (Body_Id)
2229 and then not In_Instance
2231 Style.Body_With_No_Spec (N);
2234 New_Overloaded_Entity (Body_Id);
2236 if Nkind (N) /= N_Subprogram_Body_Stub then
2237 Set_Acts_As_Spec (N);
2238 Generate_Definition (Body_Id);
2240 (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True);
2241 Generate_Reference_To_Formals (Body_Id);
2242 Install_Formals (Body_Id);
2243 Push_Scope (Body_Id);
2247 -- If the return type is an anonymous access type whose designated type
2248 -- is the limited view of a class-wide type and the non-limited view is
2249 -- available, update the return type accordingly.
2251 if Ada_Version >= Ada_05
2252 and then Comes_From_Source (N)
2259 Rtyp := Etype (Current_Scope);
2261 if Ekind (Rtyp) = E_Anonymous_Access_Type then
2262 Etyp := Directly_Designated_Type (Rtyp);
2264 if Is_Class_Wide_Type (Etyp)
2265 and then From_With_Type (Etyp)
2267 Set_Directly_Designated_Type
2268 (Etype (Current_Scope), Available_View (Etyp));
2274 -- If this is the proper body of a stub, we must verify that the stub
2275 -- conforms to the body, and to the previous spec if one was present.
2276 -- we know already that the body conforms to that spec. This test is
2277 -- only required for subprograms that come from source.
2279 if Nkind (Parent (N)) = N_Subunit
2280 and then Comes_From_Source (N)
2281 and then not Error_Posted (Body_Id)
2282 and then Nkind (Corresponding_Stub (Parent (N))) =
2283 N_Subprogram_Body_Stub
2286 Old_Id : constant Entity_Id :=
2288 (Specification (Corresponding_Stub (Parent (N))));
2290 Conformant : Boolean := False;
2293 if No (Spec_Id) then
2294 Check_Fully_Conformant (Body_Id, Old_Id);
2298 (Body_Id, Old_Id, Fully_Conformant, False, Conformant);
2300 if not Conformant then
2302 -- The stub was taken to be a new declaration. Indicate
2303 -- that it lacks a body.
2305 Set_Has_Completion (Old_Id, False);
2311 Set_Has_Completion (Body_Id);
2312 Check_Eliminated (Body_Id);
2314 if Nkind (N) = N_Subprogram_Body_Stub then
2317 elsif Present (Spec_Id)
2318 and then Expander_Active
2320 (Has_Pragma_Inline_Always (Spec_Id)
2321 or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining))
2323 Build_Body_To_Inline (N, Spec_Id);
2326 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2327 -- if its specification we have to install the private withed units.
2328 -- This holds for child units as well.
2330 if Is_Compilation_Unit (Body_Id)
2331 or else Nkind (Parent (N)) = N_Compilation_Unit
2333 Install_Private_With_Clauses (Body_Id);
2336 Check_Anonymous_Return;
2338 -- Set the Protected_Formal field of each extra formal of the protected
2339 -- subprogram to reference the corresponding extra formal of the
2340 -- subprogram that implements it. For regular formals this occurs when
2341 -- the protected subprogram's declaration is expanded, but the extra
2342 -- formals don't get created until the subprogram is frozen. We need to
2343 -- do this before analyzing the protected subprogram's body so that any
2344 -- references to the original subprogram's extra formals will be changed
2345 -- refer to the implementing subprogram's formals (see Expand_Formal).
2347 if Present (Spec_Id)
2348 and then Is_Protected_Type (Scope (Spec_Id))
2349 and then Present (Protected_Body_Subprogram (Spec_Id))
2352 Impl_Subp : constant Entity_Id :=
2353 Protected_Body_Subprogram (Spec_Id);
2354 Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id);
2355 Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp);
2357 while Present (Prot_Ext_Formal) loop
2358 pragma Assert (Present (Impl_Ext_Formal));
2359 Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal);
2360 Next_Formal_With_Extras (Prot_Ext_Formal);
2361 Next_Formal_With_Extras (Impl_Ext_Formal);
2366 -- Now we can go on to analyze the body
2368 HSS := Handled_Statement_Sequence (N);
2369 Set_Actual_Subtypes (N, Current_Scope);
2371 -- Deal with preconditions and postconditions
2373 Process_PPCs (N, Spec_Id, Body_Id);
2375 -- Add a declaration for the Protection object, renaming declarations
2376 -- for discriminals and privals and finally a declaration for the entry
2377 -- family index (if applicable). This form of early expansion is done
2378 -- when the Expander is active because Install_Private_Data_Declarations
2379 -- references entities which were created during regular expansion.
2382 and then Comes_From_Source (N)
2383 and then Present (Prot_Typ)
2384 and then Present (Spec_Id)
2385 and then not Is_Eliminated (Spec_Id)
2387 Install_Private_Data_Declarations
2388 (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N));
2391 -- Analyze the declarations (this call will analyze the precondition
2392 -- Check pragmas we prepended to the list, as well as the declaration
2393 -- of the _Postconditions procedure).
2395 Analyze_Declarations (Declarations (N));
2397 -- Check completion, and analyze the statements
2400 Inspect_Deferred_Constant_Completion (Declarations (N));
2403 -- Deal with end of scope processing for the body
2405 Process_End_Label (HSS, 't', Current_Scope);
2407 Check_Subprogram_Order (N);
2408 Set_Analyzed (Body_Id);
2410 -- If we have a separate spec, then the analysis of the declarations
2411 -- caused the entities in the body to be chained to the spec id, but
2412 -- we want them chained to the body id. Only the formal parameters
2413 -- end up chained to the spec id in this case.
2415 if Present (Spec_Id) then
2417 -- We must conform to the categorization of our spec
2419 Validate_Categorization_Dependency (N, Spec_Id);
2421 -- And if this is a child unit, the parent units must conform
2423 if Is_Child_Unit (Spec_Id) then
2424 Validate_Categorization_Dependency
2425 (Unit_Declaration_Node (Spec_Id), Spec_Id);
2428 -- Here is where we move entities from the spec to the body
2430 -- Case where there are entities that stay with the spec
2432 if Present (Last_Real_Spec_Entity) then
2434 -- No body entities (happens when the only real spec entities
2435 -- come from precondition and postcondition pragmas)
2437 if No (Last_Entity (Body_Id)) then
2439 (Body_Id, Next_Entity (Last_Real_Spec_Entity));
2441 -- Body entities present (formals), so chain stuff past them
2445 (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity));
2448 Set_Next_Entity (Last_Real_Spec_Entity, Empty);
2449 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
2450 Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity);
2452 -- Case where there are no spec entities, in this case there can
2453 -- be no body entities either, so just move everything.
2456 pragma Assert (No (Last_Entity (Body_Id)));
2457 Set_First_Entity (Body_Id, First_Entity (Spec_Id));
2458 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
2459 Set_First_Entity (Spec_Id, Empty);
2460 Set_Last_Entity (Spec_Id, Empty);
2464 -- If function, check return statements
2466 if Nkind (Body_Spec) = N_Function_Specification then
2471 if Present (Spec_Id) then
2477 if Return_Present (Id) then
2478 Check_Returns (HSS, 'F', Missing_Ret);
2481 Set_Has_Missing_Return (Id);
2484 elsif not Is_Machine_Code_Subprogram (Id)
2485 and then not Body_Deleted
2487 Error_Msg_N ("missing RETURN statement in function body", N);
2491 -- If procedure with No_Return, check returns
2493 elsif Nkind (Body_Spec) = N_Procedure_Specification
2494 and then Present (Spec_Id)
2495 and then No_Return (Spec_Id)
2497 Check_Returns (HSS, 'P', Missing_Ret, Spec_Id);
2500 -- Now we are going to check for variables that are never modified in
2501 -- the body of the procedure. But first we deal with a special case
2502 -- where we want to modify this check. If the body of the subprogram
2503 -- starts with a raise statement or its equivalent, or if the body
2504 -- consists entirely of a null statement, then it is pretty obvious
2505 -- that it is OK to not reference the parameters. For example, this
2506 -- might be the following common idiom for a stubbed function:
2507 -- statement of the procedure raises an exception. In particular this
2508 -- deals with the common idiom of a stubbed function, which might
2509 -- appear as something like
2511 -- function F (A : Integer) return Some_Type;
2514 -- raise Program_Error;
2518 -- Here the purpose of X is simply to satisfy the annoying requirement
2519 -- in Ada that there be at least one return, and we certainly do not
2520 -- want to go posting warnings on X that it is not initialized! On
2521 -- the other hand, if X is entirely unreferenced that should still
2524 -- What we do is to detect these cases, and if we find them, flag the
2525 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2526 -- suppress unwanted warnings. For the case of the function stub above
2527 -- we have a special test to set X as apparently assigned to suppress
2534 -- Skip initial labels (for one thing this occurs when we are in
2535 -- front end ZCX mode, but in any case it is irrelevant), and also
2536 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2538 Stm := First (Statements (HSS));
2539 while Nkind (Stm) = N_Label
2540 or else Nkind (Stm) in N_Push_xxx_Label
2545 -- Do the test on the original statement before expansion
2548 Ostm : constant Node_Id := Original_Node (Stm);
2551 -- If explicit raise statement, turn on flag
2553 if Nkind (Ostm) = N_Raise_Statement then
2554 Set_Trivial_Subprogram (Stm);
2556 -- If null statement, and no following statements, turn on flag
2558 elsif Nkind (Stm) = N_Null_Statement
2559 and then Comes_From_Source (Stm)
2560 and then No (Next (Stm))
2562 Set_Trivial_Subprogram (Stm);
2564 -- Check for explicit call cases which likely raise an exception
2566 elsif Nkind (Ostm) = N_Procedure_Call_Statement then
2567 if Is_Entity_Name (Name (Ostm)) then
2569 Ent : constant Entity_Id := Entity (Name (Ostm));
2572 -- If the procedure is marked No_Return, then likely it
2573 -- raises an exception, but in any case it is not coming
2574 -- back here, so turn on the flag.
2576 if Ekind (Ent) = E_Procedure
2577 and then No_Return (Ent)
2579 Set_Trivial_Subprogram (Stm);
2587 -- Check for variables that are never modified
2593 -- If there is a separate spec, then transfer Never_Set_In_Source
2594 -- flags from out parameters to the corresponding entities in the
2595 -- body. The reason we do that is we want to post error flags on
2596 -- the body entities, not the spec entities.
2598 if Present (Spec_Id) then
2599 E1 := First_Entity (Spec_Id);
2600 while Present (E1) loop
2601 if Ekind (E1) = E_Out_Parameter then
2602 E2 := First_Entity (Body_Id);
2603 while Present (E2) loop
2604 exit when Chars (E1) = Chars (E2);
2608 if Present (E2) then
2609 Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1));
2617 -- Check references in body unless it was deleted. Note that the
2618 -- check of Body_Deleted here is not just for efficiency, it is
2619 -- necessary to avoid junk warnings on formal parameters.
2621 if not Body_Deleted then
2622 Check_References (Body_Id);
2625 end Analyze_Subprogram_Body_Helper;
2627 ------------------------------------
2628 -- Analyze_Subprogram_Declaration --
2629 ------------------------------------
2631 procedure Analyze_Subprogram_Declaration (N : Node_Id) is
2632 Loc : constant Source_Ptr := Sloc (N);
2633 Designator : Entity_Id;
2635 Scop : constant Entity_Id := Current_Scope;
2636 Null_Body : Node_Id := Empty;
2638 -- Start of processing for Analyze_Subprogram_Declaration
2641 -- For a null procedure, capture the profile before analysis, for
2642 -- expansion at the freeze point and at each point of call.
2643 -- The body will only be used if the procedure has preconditions.
2644 -- In that case the body is analyzed at the freeze point.
2646 if Nkind (Specification (N)) = N_Procedure_Specification
2647 and then Null_Present (Specification (N))
2648 and then Expander_Active
2651 Make_Subprogram_Body (Loc,
2653 New_Copy_Tree (Specification (N)),
2656 Handled_Statement_Sequence =>
2657 Make_Handled_Sequence_Of_Statements (Loc,
2658 Statements => New_List (Make_Null_Statement (Loc))));
2660 -- Create new entities for body and formals
2662 Set_Defining_Unit_Name (Specification (Null_Body),
2663 Make_Defining_Identifier (Loc, Chars (Defining_Entity (N))));
2664 Set_Corresponding_Body (N, Defining_Entity (Null_Body));
2666 Form := First (Parameter_Specifications (Specification (Null_Body)));
2667 while Present (Form) loop
2668 Set_Defining_Identifier (Form,
2669 Make_Defining_Identifier (Loc,
2670 Chars (Defining_Identifier (Form))));
2674 if Is_Protected_Type (Current_Scope) then
2676 ("protected operation cannot be a null procedure", N);
2680 Designator := Analyze_Subprogram_Specification (Specification (N));
2681 Generate_Definition (Designator);
2683 if Debug_Flag_C then
2684 Write_Str ("==> subprogram spec ");
2685 Write_Name (Chars (Designator));
2686 Write_Str (" from ");
2687 Write_Location (Sloc (N));
2692 if Nkind (Specification (N)) = N_Procedure_Specification
2693 and then Null_Present (Specification (N))
2695 Set_Has_Completion (Designator);
2697 if Present (Null_Body) then
2698 Set_Corresponding_Body (N, Defining_Entity (Null_Body));
2699 Set_Body_To_Inline (N, Null_Body);
2700 Set_Is_Inlined (Designator);
2704 Validate_RCI_Subprogram_Declaration (N);
2705 New_Overloaded_Entity (Designator);
2706 Check_Delayed_Subprogram (Designator);
2708 -- If the type of the first formal of the current subprogram is a
2709 -- nongeneric tagged private type, mark the subprogram as being a
2710 -- private primitive. Ditto if this is a function with controlling
2711 -- result, and the return type is currently private.
2713 if Has_Controlling_Result (Designator)
2714 and then Is_Private_Type (Etype (Designator))
2715 and then not Is_Generic_Actual_Type (Etype (Designator))
2717 Set_Is_Private_Primitive (Designator);
2719 elsif Present (First_Formal (Designator)) then
2721 Formal_Typ : constant Entity_Id :=
2722 Etype (First_Formal (Designator));
2724 Set_Is_Private_Primitive (Designator,
2725 Is_Tagged_Type (Formal_Typ)
2726 and then Is_Private_Type (Formal_Typ)
2727 and then not Is_Generic_Actual_Type (Formal_Typ));
2731 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2734 if Ada_Version >= Ada_05
2735 and then Comes_From_Source (N)
2736 and then Is_Dispatching_Operation (Designator)
2743 if Has_Controlling_Result (Designator) then
2744 Etyp := Etype (Designator);
2747 E := First_Entity (Designator);
2749 and then Is_Formal (E)
2750 and then not Is_Controlling_Formal (E)
2758 if Is_Access_Type (Etyp) then
2759 Etyp := Directly_Designated_Type (Etyp);
2762 if Is_Interface (Etyp)
2763 and then not Is_Abstract_Subprogram (Designator)
2764 and then not (Ekind (Designator) = E_Procedure
2765 and then Null_Present (Specification (N)))
2767 Error_Msg_Name_1 := Chars (Defining_Entity (N));
2769 ("(Ada 2005) interface subprogram % must be abstract or null",
2775 -- What is the following code for, it used to be
2777 -- ??? Set_Suppress_Elaboration_Checks
2778 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2780 -- The following seems equivalent, but a bit dubious
2782 if Elaboration_Checks_Suppressed (Designator) then
2783 Set_Kill_Elaboration_Checks (Designator);
2786 if Scop /= Standard_Standard
2787 and then not Is_Child_Unit (Designator)
2789 Set_Categorization_From_Scope (Designator, Scop);
2791 -- For a compilation unit, check for library-unit pragmas
2793 Push_Scope (Designator);
2794 Set_Categorization_From_Pragmas (N);
2795 Validate_Categorization_Dependency (N, Designator);
2799 -- For a compilation unit, set body required. This flag will only be
2800 -- reset if a valid Import or Interface pragma is processed later on.
2802 if Nkind (Parent (N)) = N_Compilation_Unit then
2803 Set_Body_Required (Parent (N), True);
2805 if Ada_Version >= Ada_05
2806 and then Nkind (Specification (N)) = N_Procedure_Specification
2807 and then Null_Present (Specification (N))
2810 ("null procedure cannot be declared at library level", N);
2814 Generate_Reference_To_Formals (Designator);
2815 Check_Eliminated (Designator);
2817 if Debug_Flag_C then
2819 Write_Str ("<== subprogram spec ");
2820 Write_Name (Chars (Designator));
2821 Write_Str (" from ");
2822 Write_Location (Sloc (N));
2825 end Analyze_Subprogram_Declaration;
2827 --------------------------------------
2828 -- Analyze_Subprogram_Specification --
2829 --------------------------------------
2831 -- Reminder: N here really is a subprogram specification (not a subprogram
2832 -- declaration). This procedure is called to analyze the specification in
2833 -- both subprogram bodies and subprogram declarations (specs).
2835 function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is
2836 Designator : constant Entity_Id := Defining_Entity (N);
2837 Formals : constant List_Id := Parameter_Specifications (N);
2839 -- Start of processing for Analyze_Subprogram_Specification
2842 Generate_Definition (Designator);
2844 if Nkind (N) = N_Function_Specification then
2845 Set_Ekind (Designator, E_Function);
2846 Set_Mechanism (Designator, Default_Mechanism);
2849 Set_Ekind (Designator, E_Procedure);
2850 Set_Etype (Designator, Standard_Void_Type);
2853 -- Introduce new scope for analysis of the formals and the return type
2855 Set_Scope (Designator, Current_Scope);
2857 if Present (Formals) then
2858 Push_Scope (Designator);
2859 Process_Formals (Formals, N);
2861 -- Ada 2005 (AI-345): If this is an overriding operation of an
2862 -- inherited interface operation, and the controlling type is
2863 -- a synchronized type, replace the type with its corresponding
2864 -- record, to match the proper signature of an overriding operation.
2865 -- Same processing for an access parameter whose designated type is
2866 -- derived from a synchronized interface.
2868 if Ada_Version >= Ada_05 then
2871 Formal_Typ : Entity_Id;
2872 Rec_Typ : Entity_Id;
2873 Desig_Typ : Entity_Id;
2876 Formal := First_Formal (Designator);
2877 while Present (Formal) loop
2878 Formal_Typ := Etype (Formal);
2880 if Is_Concurrent_Type (Formal_Typ)
2881 and then Present (Corresponding_Record_Type (Formal_Typ))
2883 Rec_Typ := Corresponding_Record_Type (Formal_Typ);
2885 if Present (Interfaces (Rec_Typ)) then
2886 Set_Etype (Formal, Rec_Typ);
2889 elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then
2890 Desig_Typ := Designated_Type (Formal_Typ);
2892 if Is_Concurrent_Type (Desig_Typ)
2893 and then Present (Corresponding_Record_Type (Desig_Typ))
2895 Rec_Typ := Corresponding_Record_Type (Desig_Typ);
2897 if Present (Interfaces (Rec_Typ)) then
2898 Set_Directly_Designated_Type (Formal_Typ, Rec_Typ);
2903 Next_Formal (Formal);
2910 -- The subprogram scope is pushed and popped around the processing of
2911 -- the return type for consistency with call above to Process_Formals
2912 -- (which itself can call Analyze_Return_Type), and to ensure that any
2913 -- itype created for the return type will be associated with the proper
2916 elsif Nkind (N) = N_Function_Specification then
2917 Push_Scope (Designator);
2919 Analyze_Return_Type (N);
2924 if Nkind (N) = N_Function_Specification then
2925 if Nkind (Designator) = N_Defining_Operator_Symbol then
2926 Valid_Operator_Definition (Designator);
2929 May_Need_Actuals (Designator);
2931 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2932 -- the subprogram is abstract also. This does not apply to renaming
2933 -- declarations, where abstractness is inherited.
2934 -- In case of primitives associated with abstract interface types
2935 -- the check is applied later (see Analyze_Subprogram_Declaration).
2937 if Is_Abstract_Type (Etype (Designator))
2938 and then not Is_Interface (Etype (Designator))
2939 and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration
2940 and then Nkind (Parent (N)) /=
2941 N_Abstract_Subprogram_Declaration
2943 (Nkind (Parent (N))) /= N_Formal_Abstract_Subprogram_Declaration
2946 ("function that returns abstract type must be abstract", N);
2951 end Analyze_Subprogram_Specification;
2953 --------------------------
2954 -- Build_Body_To_Inline --
2955 --------------------------
2957 procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is
2958 Decl : constant Node_Id := Unit_Declaration_Node (Subp);
2959 Original_Body : Node_Id;
2960 Body_To_Analyze : Node_Id;
2961 Max_Size : constant := 10;
2962 Stat_Count : Integer := 0;
2964 function Has_Excluded_Declaration (Decls : List_Id) return Boolean;
2965 -- Check for declarations that make inlining not worthwhile
2967 function Has_Excluded_Statement (Stats : List_Id) return Boolean;
2968 -- Check for statements that make inlining not worthwhile: any tasking
2969 -- statement, nested at any level. Keep track of total number of
2970 -- elementary statements, as a measure of acceptable size.
2972 function Has_Pending_Instantiation return Boolean;
2973 -- If some enclosing body contains instantiations that appear before the
2974 -- corresponding generic body, the enclosing body has a freeze node so
2975 -- that it can be elaborated after the generic itself. This might
2976 -- conflict with subsequent inlinings, so that it is unsafe to try to
2977 -- inline in such a case.
2979 function Has_Single_Return return Boolean;
2980 -- In general we cannot inline functions that return unconstrained type.
2981 -- However, we can handle such functions if all return statements return
2982 -- a local variable that is the only declaration in the body of the
2983 -- function. In that case the call can be replaced by that local
2984 -- variable as is done for other inlined calls.
2986 procedure Remove_Pragmas;
2987 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2988 -- parameter has no meaning when the body is inlined and the formals
2989 -- are rewritten. Remove it from body to inline. The analysis of the
2990 -- non-inlined body will handle the pragma properly.
2992 function Uses_Secondary_Stack (Bod : Node_Id) return Boolean;
2993 -- If the body of the subprogram includes a call that returns an
2994 -- unconstrained type, the secondary stack is involved, and it
2995 -- is not worth inlining.
2997 ------------------------------
2998 -- Has_Excluded_Declaration --
2999 ------------------------------
3001 function Has_Excluded_Declaration (Decls : List_Id) return Boolean is
3004 function Is_Unchecked_Conversion (D : Node_Id) return Boolean;
3005 -- Nested subprograms make a given body ineligible for inlining, but
3006 -- we make an exception for instantiations of unchecked conversion.
3007 -- The body has not been analyzed yet, so check the name, and verify
3008 -- that the visible entity with that name is the predefined unit.
3010 -----------------------------
3011 -- Is_Unchecked_Conversion --
3012 -----------------------------
3014 function Is_Unchecked_Conversion (D : Node_Id) return Boolean is
3015 Id : constant Node_Id := Name (D);
3019 if Nkind (Id) = N_Identifier
3020 and then Chars (Id) = Name_Unchecked_Conversion
3022 Conv := Current_Entity (Id);
3024 elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name)
3025 and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion
3027 Conv := Current_Entity (Selector_Name (Id));
3032 return Present (Conv)
3033 and then Is_Predefined_File_Name
3034 (Unit_File_Name (Get_Source_Unit (Conv)))
3035 and then Is_Intrinsic_Subprogram (Conv);
3036 end Is_Unchecked_Conversion;
3038 -- Start of processing for Has_Excluded_Declaration
3042 while Present (D) loop
3043 if (Nkind (D) = N_Function_Instantiation
3044 and then not Is_Unchecked_Conversion (D))
3045 or else Nkind_In (D, N_Protected_Type_Declaration,
3046 N_Package_Declaration,
3047 N_Package_Instantiation,
3049 N_Procedure_Instantiation,
3050 N_Task_Type_Declaration)
3053 ("cannot inline & (non-allowed declaration)?", D, Subp);
3061 end Has_Excluded_Declaration;
3063 ----------------------------
3064 -- Has_Excluded_Statement --
3065 ----------------------------
3067 function Has_Excluded_Statement (Stats : List_Id) return Boolean is
3073 while Present (S) loop
3074 Stat_Count := Stat_Count + 1;
3076 if Nkind_In (S, N_Abort_Statement,
3077 N_Asynchronous_Select,
3078 N_Conditional_Entry_Call,
3079 N_Delay_Relative_Statement,
3080 N_Delay_Until_Statement,
3085 ("cannot inline & (non-allowed statement)?", S, Subp);
3088 elsif Nkind (S) = N_Block_Statement then
3089 if Present (Declarations (S))
3090 and then Has_Excluded_Declaration (Declarations (S))
3094 elsif Present (Handled_Statement_Sequence (S))
3097 (Exception_Handlers (Handled_Statement_Sequence (S)))
3099 Has_Excluded_Statement
3100 (Statements (Handled_Statement_Sequence (S))))
3105 elsif Nkind (S) = N_Case_Statement then
3106 E := First (Alternatives (S));
3107 while Present (E) loop
3108 if Has_Excluded_Statement (Statements (E)) then
3115 elsif Nkind (S) = N_If_Statement then
3116 if Has_Excluded_Statement (Then_Statements (S)) then
3120 if Present (Elsif_Parts (S)) then
3121 E := First (Elsif_Parts (S));
3122 while Present (E) loop
3123 if Has_Excluded_Statement (Then_Statements (E)) then
3130 if Present (Else_Statements (S))
3131 and then Has_Excluded_Statement (Else_Statements (S))
3136 elsif Nkind (S) = N_Loop_Statement
3137 and then Has_Excluded_Statement (Statements (S))
3146 end Has_Excluded_Statement;
3148 -------------------------------
3149 -- Has_Pending_Instantiation --
3150 -------------------------------
3152 function Has_Pending_Instantiation return Boolean is
3157 while Present (S) loop
3158 if Is_Compilation_Unit (S)
3159 or else Is_Child_Unit (S)
3162 elsif Ekind (S) = E_Package
3163 and then Has_Forward_Instantiation (S)
3172 end Has_Pending_Instantiation;
3174 ------------------------
3175 -- Has_Single_Return --
3176 ------------------------
3178 function Has_Single_Return return Boolean is
3179 Return_Statement : Node_Id := Empty;
3181 function Check_Return (N : Node_Id) return Traverse_Result;
3187 function Check_Return (N : Node_Id) return Traverse_Result is
3189 if Nkind (N) = N_Simple_Return_Statement then
3190 if Present (Expression (N))
3191 and then Is_Entity_Name (Expression (N))
3193 if No (Return_Statement) then
3194 Return_Statement := N;
3197 elsif Chars (Expression (N)) =
3198 Chars (Expression (Return_Statement))
3207 -- Expression has wrong form
3217 function Check_All_Returns is new Traverse_Func (Check_Return);
3219 -- Start of processing for Has_Single_Return
3222 return Check_All_Returns (N) = OK
3223 and then Present (Declarations (N))
3224 and then Present (First (Declarations (N)))
3225 and then Chars (Expression (Return_Statement)) =
3226 Chars (Defining_Identifier (First (Declarations (N))));
3227 end Has_Single_Return;
3229 --------------------
3230 -- Remove_Pragmas --
3231 --------------------
3233 procedure Remove_Pragmas is
3238 Decl := First (Declarations (Body_To_Analyze));
3239 while Present (Decl) loop
3242 if Nkind (Decl) = N_Pragma
3243 and then (Pragma_Name (Decl) = Name_Unreferenced
3245 Pragma_Name (Decl) = Name_Unmodified)
3254 --------------------------
3255 -- Uses_Secondary_Stack --
3256 --------------------------
3258 function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is
3259 function Check_Call (N : Node_Id) return Traverse_Result;
3260 -- Look for function calls that return an unconstrained type
3266 function Check_Call (N : Node_Id) return Traverse_Result is
3268 if Nkind (N) = N_Function_Call
3269 and then Is_Entity_Name (Name (N))
3270 and then Is_Composite_Type (Etype (Entity (Name (N))))
3271 and then not Is_Constrained (Etype (Entity (Name (N))))
3274 ("cannot inline & (call returns unconstrained type)?",
3282 function Check_Calls is new Traverse_Func (Check_Call);
3285 return Check_Calls (Bod) = Abandon;
3286 end Uses_Secondary_Stack;
3288 -- Start of processing for Build_Body_To_Inline
3291 -- Return immediately if done already
3293 if Nkind (Decl) = N_Subprogram_Declaration
3294 and then Present (Body_To_Inline (Decl))
3298 -- Functions that return unconstrained composite types require
3299 -- secondary stack handling, and cannot currently be inlined, unless
3300 -- all return statements return a local variable that is the first
3301 -- local declaration in the body.
3303 elsif Ekind (Subp) = E_Function
3304 and then not Is_Scalar_Type (Etype (Subp))
3305 and then not Is_Access_Type (Etype (Subp))
3306 and then not Is_Constrained (Etype (Subp))
3308 if not Has_Single_Return then
3310 ("cannot inline & (unconstrained return type)?", N, Subp);
3314 -- Ditto for functions that return controlled types, where controlled
3315 -- actions interfere in complex ways with inlining.
3317 elsif Ekind (Subp) = E_Function
3318 and then Needs_Finalization (Etype (Subp))
3321 ("cannot inline & (controlled return type)?", N, Subp);
3325 if Present (Declarations (N))
3326 and then Has_Excluded_Declaration (Declarations (N))
3331 if Present (Handled_Statement_Sequence (N)) then
3332 if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then
3334 ("cannot inline& (exception handler)?",
3335 First (Exception_Handlers (Handled_Statement_Sequence (N))),
3339 Has_Excluded_Statement
3340 (Statements (Handled_Statement_Sequence (N)))
3346 -- We do not inline a subprogram that is too large, unless it is
3347 -- marked Inline_Always. This pragma does not suppress the other
3348 -- checks on inlining (forbidden declarations, handlers, etc).
3350 if Stat_Count > Max_Size
3351 and then not Has_Pragma_Inline_Always (Subp)
3353 Cannot_Inline ("cannot inline& (body too large)?", N, Subp);
3357 if Has_Pending_Instantiation then
3359 ("cannot inline& (forward instance within enclosing body)?",
3364 -- Within an instance, the body to inline must be treated as a nested
3365 -- generic, so that the proper global references are preserved.
3367 -- Note that we do not do this at the library level, because it is not
3368 -- needed, and furthermore this causes trouble if front end inlining
3369 -- is activated (-gnatN).
3371 if In_Instance and then Scope (Current_Scope) /= Standard_Standard then
3372 Save_Env (Scope (Current_Scope), Scope (Current_Scope));
3373 Original_Body := Copy_Generic_Node (N, Empty, True);
3375 Original_Body := Copy_Separate_Tree (N);
3378 -- We need to capture references to the formals in order to substitute
3379 -- the actuals at the point of inlining, i.e. instantiation. To treat
3380 -- the formals as globals to the body to inline, we nest it within
3381 -- a dummy parameterless subprogram, declared within the real one.
3382 -- To avoid generating an internal name (which is never public, and
3383 -- which affects serial numbers of other generated names), we use
3384 -- an internal symbol that cannot conflict with user declarations.
3386 Set_Parameter_Specifications (Specification (Original_Body), No_List);
3387 Set_Defining_Unit_Name
3388 (Specification (Original_Body),
3389 Make_Defining_Identifier (Sloc (N), Name_uParent));
3390 Set_Corresponding_Spec (Original_Body, Empty);
3392 Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False);
3394 -- Set return type of function, which is also global and does not need
3397 if Ekind (Subp) = E_Function then
3398 Set_Result_Definition (Specification (Body_To_Analyze),
3399 New_Occurrence_Of (Etype (Subp), Sloc (N)));
3402 if No (Declarations (N)) then
3403 Set_Declarations (N, New_List (Body_To_Analyze));
3405 Append (Body_To_Analyze, Declarations (N));
3408 Expander_Mode_Save_And_Set (False);
3411 Analyze (Body_To_Analyze);
3412 Push_Scope (Defining_Entity (Body_To_Analyze));
3413 Save_Global_References (Original_Body);
3415 Remove (Body_To_Analyze);
3417 Expander_Mode_Restore;
3419 -- Restore environment if previously saved
3421 if In_Instance and then Scope (Current_Scope) /= Standard_Standard then
3425 -- If secondary stk used there is no point in inlining. We have
3426 -- already issued the warning in this case, so nothing to do.
3428 if Uses_Secondary_Stack (Body_To_Analyze) then
3432 Set_Body_To_Inline (Decl, Original_Body);
3433 Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp));
3434 Set_Is_Inlined (Subp);
3435 end Build_Body_To_Inline;
3441 procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id) is
3443 -- Do not emit warning if this is a predefined unit which is not
3444 -- the main unit. With validity checks enabled, some predefined
3445 -- subprograms may contain nested subprograms and become ineligible
3448 if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp)))
3449 and then not In_Extended_Main_Source_Unit (Subp)
3453 elsif Has_Pragma_Inline_Always (Subp) then
3455 -- Remove last character (question mark) to make this into an error,
3456 -- because the Inline_Always pragma cannot be obeyed.
3458 Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp);
3460 elsif Ineffective_Inline_Warnings then
3461 Error_Msg_NE (Msg, N, Subp);
3465 -----------------------
3466 -- Check_Conformance --
3467 -----------------------
3469 procedure Check_Conformance
3470 (New_Id : Entity_Id;
3472 Ctype : Conformance_Type;
3474 Conforms : out Boolean;
3475 Err_Loc : Node_Id := Empty;
3476 Get_Inst : Boolean := False;
3477 Skip_Controlling_Formals : Boolean := False)
3479 procedure Conformance_Error (Msg : String; N : Node_Id := New_Id);
3480 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
3481 -- If Errmsg is True, then processing continues to post an error message
3482 -- for conformance error on given node. Two messages are output. The
3483 -- first message points to the previous declaration with a general "no
3484 -- conformance" message. The second is the detailed reason, supplied as
3485 -- Msg. The parameter N provide information for a possible & insertion
3486 -- in the message, and also provides the location for posting the
3487 -- message in the absence of a specified Err_Loc location.
3489 -----------------------
3490 -- Conformance_Error --
3491 -----------------------
3493 procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is
3500 if No (Err_Loc) then
3506 Error_Msg_Sloc := Sloc (Old_Id);
3509 when Type_Conformant =>
3510 Error_Msg_N -- CODEFIX
3511 ("not type conformant with declaration#!", Enode);
3513 when Mode_Conformant =>
3514 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3515 Error_Msg_N -- CODEFIX???
3516 ("not mode conformant with operation inherited#!",
3519 Error_Msg_N -- CODEFIX???
3520 ("not mode conformant with declaration#!", Enode);
3523 when Subtype_Conformant =>
3524 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3525 Error_Msg_N -- CODEFIX???
3526 ("not subtype conformant with operation inherited#!",
3529 Error_Msg_N -- CODEFIX???
3530 ("not subtype conformant with declaration#!", Enode);
3533 when Fully_Conformant =>
3534 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3535 Error_Msg_N -- CODEFIX
3536 ("not fully conformant with operation inherited#!",
3539 Error_Msg_N -- CODEFIX
3540 ("not fully conformant with declaration#!", Enode);
3544 Error_Msg_NE (Msg, Enode, N);
3546 end Conformance_Error;
3550 Old_Type : constant Entity_Id := Etype (Old_Id);
3551 New_Type : constant Entity_Id := Etype (New_Id);
3552 Old_Formal : Entity_Id;
3553 New_Formal : Entity_Id;
3554 Access_Types_Match : Boolean;
3555 Old_Formal_Base : Entity_Id;
3556 New_Formal_Base : Entity_Id;
3558 -- Start of processing for Check_Conformance
3563 -- We need a special case for operators, since they don't appear
3566 if Ctype = Type_Conformant then
3567 if Ekind (New_Id) = E_Operator
3568 and then Operator_Matches_Spec (New_Id, Old_Id)
3574 -- If both are functions/operators, check return types conform
3576 if Old_Type /= Standard_Void_Type
3577 and then New_Type /= Standard_Void_Type
3580 -- If we are checking interface conformance we omit controlling
3581 -- arguments and result, because we are only checking the conformance
3582 -- of the remaining parameters.
3584 if Has_Controlling_Result (Old_Id)
3585 and then Has_Controlling_Result (New_Id)
3586 and then Skip_Controlling_Formals
3590 elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then
3591 Conformance_Error ("\return type does not match!", New_Id);
3595 -- Ada 2005 (AI-231): In case of anonymous access types check the
3596 -- null-exclusion and access-to-constant attributes match.
3598 if Ada_Version >= Ada_05
3599 and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type
3601 (Can_Never_Be_Null (Old_Type)
3602 /= Can_Never_Be_Null (New_Type)
3603 or else Is_Access_Constant (Etype (Old_Type))
3604 /= Is_Access_Constant (Etype (New_Type)))
3606 Conformance_Error ("\return type does not match!", New_Id);
3610 -- If either is a function/operator and the other isn't, error
3612 elsif Old_Type /= Standard_Void_Type
3613 or else New_Type /= Standard_Void_Type
3615 Conformance_Error ("\functions can only match functions!", New_Id);
3619 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3620 -- If this is a renaming as body, refine error message to indicate that
3621 -- the conflict is with the original declaration. If the entity is not
3622 -- frozen, the conventions don't have to match, the one of the renamed
3623 -- entity is inherited.
3625 if Ctype >= Subtype_Conformant then
3626 if Convention (Old_Id) /= Convention (New_Id) then
3628 if not Is_Frozen (New_Id) then
3631 elsif Present (Err_Loc)
3632 and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration
3633 and then Present (Corresponding_Spec (Err_Loc))
3635 Error_Msg_Name_1 := Chars (New_Id);
3637 Name_Ada + Convention_Id'Pos (Convention (New_Id));
3639 Conformance_Error ("\prior declaration for% has convention %!");
3642 Conformance_Error ("\calling conventions do not match!");
3647 elsif Is_Formal_Subprogram (Old_Id)
3648 or else Is_Formal_Subprogram (New_Id)
3650 Conformance_Error ("\formal subprograms not allowed!");
3655 -- Deal with parameters
3657 -- Note: we use the entity information, rather than going directly
3658 -- to the specification in the tree. This is not only simpler, but
3659 -- absolutely necessary for some cases of conformance tests between
3660 -- operators, where the declaration tree simply does not exist!
3662 Old_Formal := First_Formal (Old_Id);
3663 New_Formal := First_Formal (New_Id);
3664 while Present (Old_Formal) and then Present (New_Formal) loop
3665 if Is_Controlling_Formal (Old_Formal)
3666 and then Is_Controlling_Formal (New_Formal)
3667 and then Skip_Controlling_Formals
3669 -- The controlling formals will have different types when
3670 -- comparing an interface operation with its match, but both
3671 -- or neither must be access parameters.
3673 if Is_Access_Type (Etype (Old_Formal))
3675 Is_Access_Type (Etype (New_Formal))
3677 goto Skip_Controlling_Formal;
3680 ("\access parameter does not match!", New_Formal);
3684 if Ctype = Fully_Conformant then
3686 -- Names must match. Error message is more accurate if we do
3687 -- this before checking that the types of the formals match.
3689 if Chars (Old_Formal) /= Chars (New_Formal) then
3690 Conformance_Error ("\name & does not match!", New_Formal);
3692 -- Set error posted flag on new formal as well to stop
3693 -- junk cascaded messages in some cases.
3695 Set_Error_Posted (New_Formal);
3700 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3701 -- case occurs whenever a subprogram is being renamed and one of its
3702 -- parameters imposes a null exclusion. For example:
3704 -- type T is null record;
3705 -- type Acc_T is access T;
3706 -- subtype Acc_T_Sub is Acc_T;
3708 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3709 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3712 Old_Formal_Base := Etype (Old_Formal);
3713 New_Formal_Base := Etype (New_Formal);
3716 Old_Formal_Base := Get_Instance_Of (Old_Formal_Base);
3717 New_Formal_Base := Get_Instance_Of (New_Formal_Base);
3720 Access_Types_Match := Ada_Version >= Ada_05
3722 -- Ensure that this rule is only applied when New_Id is a
3723 -- renaming of Old_Id.
3725 and then Nkind (Parent (Parent (New_Id))) =
3726 N_Subprogram_Renaming_Declaration
3727 and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity
3728 and then Present (Entity (Name (Parent (Parent (New_Id)))))
3729 and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id
3731 -- Now handle the allowed access-type case
3733 and then Is_Access_Type (Old_Formal_Base)
3734 and then Is_Access_Type (New_Formal_Base)
3736 -- The type kinds must match. The only exception occurs with
3737 -- multiple generics of the form:
3740 -- type F is private; type A is private;
3741 -- type F_Ptr is access F; type A_Ptr is access A;
3742 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3743 -- package F_Pack is ... package A_Pack is
3744 -- package F_Inst is
3745 -- new F_Pack (A, A_Ptr, A_P);
3747 -- When checking for conformance between the parameters of A_P
3748 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3749 -- because the compiler has transformed A_Ptr into a subtype of
3750 -- F_Ptr. We catch this case in the code below.
3752 and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base)
3754 (Is_Generic_Type (Old_Formal_Base)
3755 and then Is_Generic_Type (New_Formal_Base)
3756 and then Is_Internal (New_Formal_Base)
3757 and then Etype (Etype (New_Formal_Base)) =
3759 and then Directly_Designated_Type (Old_Formal_Base) =
3760 Directly_Designated_Type (New_Formal_Base)
3761 and then ((Is_Itype (Old_Formal_Base)
3762 and then Can_Never_Be_Null (Old_Formal_Base))
3764 (Is_Itype (New_Formal_Base)
3765 and then Can_Never_Be_Null (New_Formal_Base)));
3767 -- Types must always match. In the visible part of an instance,
3768 -- usual overloading rules for dispatching operations apply, and
3769 -- we check base types (not the actual subtypes).
3771 if In_Instance_Visible_Part
3772 and then Is_Dispatching_Operation (New_Id)
3774 if not Conforming_Types
3775 (T1 => Base_Type (Etype (Old_Formal)),
3776 T2 => Base_Type (Etype (New_Formal)),
3778 Get_Inst => Get_Inst)
3779 and then not Access_Types_Match
3781 Conformance_Error ("\type of & does not match!", New_Formal);
3785 elsif not Conforming_Types
3786 (T1 => Old_Formal_Base,
3787 T2 => New_Formal_Base,
3789 Get_Inst => Get_Inst)
3790 and then not Access_Types_Match
3792 -- Don't give error message if old type is Any_Type. This test
3793 -- avoids some cascaded errors, e.g. in case of a bad spec.
3795 if Errmsg and then Old_Formal_Base = Any_Type then
3798 Conformance_Error ("\type of & does not match!", New_Formal);
3804 -- For mode conformance, mode must match
3806 if Ctype >= Mode_Conformant then
3807 if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then
3808 Conformance_Error ("\mode of & does not match!", New_Formal);
3811 -- Part of mode conformance for access types is having the same
3812 -- constant modifier.
3814 elsif Access_Types_Match
3815 and then Is_Access_Constant (Old_Formal_Base) /=
3816 Is_Access_Constant (New_Formal_Base)
3819 ("\constant modifier does not match!", New_Formal);
3824 if Ctype >= Subtype_Conformant then
3826 -- Ada 2005 (AI-231): In case of anonymous access types check
3827 -- the null-exclusion and access-to-constant attributes must
3830 if Ada_Version >= Ada_05
3831 and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type
3832 and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type
3834 (Can_Never_Be_Null (Old_Formal) /=
3835 Can_Never_Be_Null (New_Formal)
3837 Is_Access_Constant (Etype (Old_Formal)) /=
3838 Is_Access_Constant (Etype (New_Formal)))
3840 -- It is allowed to omit the null-exclusion in case of stream
3841 -- attribute subprograms. We recognize stream subprograms
3842 -- through their TSS-generated suffix.
3845 TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id);
3847 if TSS_Name /= TSS_Stream_Read
3848 and then TSS_Name /= TSS_Stream_Write
3849 and then TSS_Name /= TSS_Stream_Input
3850 and then TSS_Name /= TSS_Stream_Output
3853 ("\type of & does not match!", New_Formal);
3860 -- Full conformance checks
3862 if Ctype = Fully_Conformant then
3864 -- We have checked already that names match
3866 if Parameter_Mode (Old_Formal) = E_In_Parameter then
3868 -- Check default expressions for in parameters
3871 NewD : constant Boolean :=
3872 Present (Default_Value (New_Formal));
3873 OldD : constant Boolean :=
3874 Present (Default_Value (Old_Formal));
3876 if NewD or OldD then
3878 -- The old default value has been analyzed because the
3879 -- current full declaration will have frozen everything
3880 -- before. The new default value has not been analyzed,
3881 -- so analyze it now before we check for conformance.
3884 Push_Scope (New_Id);
3885 Preanalyze_Spec_Expression
3886 (Default_Value (New_Formal), Etype (New_Formal));
3890 if not (NewD and OldD)
3891 or else not Fully_Conformant_Expressions
3892 (Default_Value (Old_Formal),
3893 Default_Value (New_Formal))
3896 ("\default expression for & does not match!",
3905 -- A couple of special checks for Ada 83 mode. These checks are
3906 -- skipped if either entity is an operator in package Standard,
3907 -- or if either old or new instance is not from the source program.
3909 if Ada_Version = Ada_83
3910 and then Sloc (Old_Id) > Standard_Location
3911 and then Sloc (New_Id) > Standard_Location
3912 and then Comes_From_Source (Old_Id)
3913 and then Comes_From_Source (New_Id)
3916 Old_Param : constant Node_Id := Declaration_Node (Old_Formal);
3917 New_Param : constant Node_Id := Declaration_Node (New_Formal);
3920 -- Explicit IN must be present or absent in both cases. This
3921 -- test is required only in the full conformance case.
3923 if In_Present (Old_Param) /= In_Present (New_Param)
3924 and then Ctype = Fully_Conformant
3927 ("\(Ada 83) IN must appear in both declarations",
3932 -- Grouping (use of comma in param lists) must be the same
3933 -- This is where we catch a misconformance like:
3936 -- A : Integer; B : Integer
3938 -- which are represented identically in the tree except
3939 -- for the setting of the flags More_Ids and Prev_Ids.
3941 if More_Ids (Old_Param) /= More_Ids (New_Param)
3942 or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param)
3945 ("\grouping of & does not match!", New_Formal);
3951 -- This label is required when skipping controlling formals
3953 <<Skip_Controlling_Formal>>
3955 Next_Formal (Old_Formal);
3956 Next_Formal (New_Formal);
3959 if Present (Old_Formal) then
3960 Conformance_Error ("\too few parameters!");
3963 elsif Present (New_Formal) then
3964 Conformance_Error ("\too many parameters!", New_Formal);
3967 end Check_Conformance;
3969 -----------------------
3970 -- Check_Conventions --
3971 -----------------------
3973 procedure Check_Conventions (Typ : Entity_Id) is
3974 Ifaces_List : Elist_Id;
3976 procedure Check_Convention (Op : Entity_Id);
3977 -- Verify that the convention of inherited dispatching operation Op is
3978 -- consistent among all subprograms it overrides. In order to minimize
3979 -- the search, Search_From is utilized to designate a specific point in
3980 -- the list rather than iterating over the whole list once more.
3982 ----------------------
3983 -- Check_Convention --
3984 ----------------------
3986 procedure Check_Convention (Op : Entity_Id) is
3987 Iface_Elmt : Elmt_Id;
3988 Iface_Prim_Elmt : Elmt_Id;
3989 Iface_Prim : Entity_Id;
3992 Iface_Elmt := First_Elmt (Ifaces_List);
3993 while Present (Iface_Elmt) loop
3995 First_Elmt (Primitive_Operations (Node (Iface_Elmt)));
3996 while Present (Iface_Prim_Elmt) loop
3997 Iface_Prim := Node (Iface_Prim_Elmt);
3999 if Is_Interface_Conformant (Typ, Iface_Prim, Op)
4000 and then Convention (Iface_Prim) /= Convention (Op)
4003 ("inconsistent conventions in primitive operations", Typ);
4005 Error_Msg_Name_1 := Chars (Op);
4006 Error_Msg_Name_2 := Get_Convention_Name (Convention (Op));
4007 Error_Msg_Sloc := Sloc (Op);
4009 if Comes_From_Source (Op) then
4010 if not Is_Overriding_Operation (Op) then
4011 Error_Msg_N ("\\primitive % defined #", Typ);
4013 Error_Msg_N ("\\overriding operation % with " &
4014 "convention % defined #", Typ);
4017 else pragma Assert (Present (Alias (Op)));
4018 Error_Msg_Sloc := Sloc (Alias (Op));
4019 Error_Msg_N ("\\inherited operation % with " &
4020 "convention % defined #", Typ);
4023 Error_Msg_Name_1 := Chars (Op);
4025 Get_Convention_Name (Convention (Iface_Prim));
4026 Error_Msg_Sloc := Sloc (Iface_Prim);
4027 Error_Msg_N ("\\overridden operation % with " &
4028 "convention % defined #", Typ);
4030 -- Avoid cascading errors
4035 Next_Elmt (Iface_Prim_Elmt);
4038 Next_Elmt (Iface_Elmt);
4040 end Check_Convention;
4044 Prim_Op : Entity_Id;
4045 Prim_Op_Elmt : Elmt_Id;
4047 -- Start of processing for Check_Conventions
4050 if not Has_Interfaces (Typ) then
4054 Collect_Interfaces (Typ, Ifaces_List);
4056 -- The algorithm checks every overriding dispatching operation against
4057 -- all the corresponding overridden dispatching operations, detecting
4058 -- differences in conventions.
4060 Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ));
4061 while Present (Prim_Op_Elmt) loop
4062 Prim_Op := Node (Prim_Op_Elmt);
4064 -- A small optimization: skip the predefined dispatching operations
4065 -- since they always have the same convention.
4067 if not Is_Predefined_Dispatching_Operation (Prim_Op) then
4068 Check_Convention (Prim_Op);
4071 Next_Elmt (Prim_Op_Elmt);
4073 end Check_Conventions;
4075 ------------------------------
4076 -- Check_Delayed_Subprogram --
4077 ------------------------------
4079 procedure Check_Delayed_Subprogram (Designator : Entity_Id) is
4082 procedure Possible_Freeze (T : Entity_Id);
4083 -- T is the type of either a formal parameter or of the return type.
4084 -- If T is not yet frozen and needs a delayed freeze, then the
4085 -- subprogram itself must be delayed. If T is the limited view of an
4086 -- incomplete type the subprogram must be frozen as well, because
4087 -- T may depend on local types that have not been frozen yet.
4089 ---------------------
4090 -- Possible_Freeze --
4091 ---------------------
4093 procedure Possible_Freeze (T : Entity_Id) is
4095 if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then
4096 Set_Has_Delayed_Freeze (Designator);
4098 elsif Is_Access_Type (T)
4099 and then Has_Delayed_Freeze (Designated_Type (T))
4100 and then not Is_Frozen (Designated_Type (T))
4102 Set_Has_Delayed_Freeze (Designator);
4104 elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then
4105 Set_Has_Delayed_Freeze (Designator);
4108 end Possible_Freeze;
4110 -- Start of processing for Check_Delayed_Subprogram
4113 -- Never need to freeze abstract subprogram
4115 if Ekind (Designator) /= E_Subprogram_Type
4116 and then Is_Abstract_Subprogram (Designator)
4120 -- Need delayed freeze if return type itself needs a delayed
4121 -- freeze and is not yet frozen.
4123 Possible_Freeze (Etype (Designator));
4124 Possible_Freeze (Base_Type (Etype (Designator))); -- needed ???
4126 -- Need delayed freeze if any of the formal types themselves need
4127 -- a delayed freeze and are not yet frozen.
4129 F := First_Formal (Designator);
4130 while Present (F) loop
4131 Possible_Freeze (Etype (F));
4132 Possible_Freeze (Base_Type (Etype (F))); -- needed ???
4137 -- Mark functions that return by reference. Note that it cannot be
4138 -- done for delayed_freeze subprograms because the underlying
4139 -- returned type may not be known yet (for private types)
4141 if not Has_Delayed_Freeze (Designator)
4142 and then Expander_Active
4145 Typ : constant Entity_Id := Etype (Designator);
4146 Utyp : constant Entity_Id := Underlying_Type (Typ);
4149 if Is_Inherently_Limited_Type (Typ) then
4150 Set_Returns_By_Ref (Designator);
4152 elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then
4153 Set_Returns_By_Ref (Designator);
4157 end Check_Delayed_Subprogram;
4159 ------------------------------------
4160 -- Check_Discriminant_Conformance --
4161 ------------------------------------
4163 procedure Check_Discriminant_Conformance
4168 Old_Discr : Entity_Id := First_Discriminant (Prev);
4169 New_Discr : Node_Id := First (Discriminant_Specifications (N));
4170 New_Discr_Id : Entity_Id;
4171 New_Discr_Type : Entity_Id;
4173 procedure Conformance_Error (Msg : String; N : Node_Id);
4174 -- Post error message for conformance error on given node. Two messages
4175 -- are output. The first points to the previous declaration with a
4176 -- general "no conformance" message. The second is the detailed reason,
4177 -- supplied as Msg. The parameter N provide information for a possible
4178 -- & insertion in the message.
4180 -----------------------
4181 -- Conformance_Error --
4182 -----------------------
4184 procedure Conformance_Error (Msg : String; N : Node_Id) is
4186 Error_Msg_Sloc := Sloc (Prev_Loc);
4187 Error_Msg_N -- CODEFIX
4188 ("not fully conformant with declaration#!", N);
4189 Error_Msg_NE (Msg, N, N);
4190 end Conformance_Error;
4192 -- Start of processing for Check_Discriminant_Conformance
4195 while Present (Old_Discr) and then Present (New_Discr) loop
4197 New_Discr_Id := Defining_Identifier (New_Discr);
4199 -- The subtype mark of the discriminant on the full type has not
4200 -- been analyzed so we do it here. For an access discriminant a new
4203 if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then
4205 Access_Definition (N, Discriminant_Type (New_Discr));
4208 Analyze (Discriminant_Type (New_Discr));
4209 New_Discr_Type := Etype (Discriminant_Type (New_Discr));
4211 -- Ada 2005: if the discriminant definition carries a null
4212 -- exclusion, create an itype to check properly for consistency
4213 -- with partial declaration.
4215 if Is_Access_Type (New_Discr_Type)
4216 and then Null_Exclusion_Present (New_Discr)
4219 Create_Null_Excluding_Itype
4220 (T => New_Discr_Type,
4221 Related_Nod => New_Discr,
4222 Scope_Id => Current_Scope);
4226 if not Conforming_Types
4227 (Etype (Old_Discr), New_Discr_Type, Fully_Conformant)
4229 Conformance_Error ("type of & does not match!", New_Discr_Id);
4232 -- Treat the new discriminant as an occurrence of the old one,
4233 -- for navigation purposes, and fill in some semantic
4234 -- information, for completeness.
4236 Generate_Reference (Old_Discr, New_Discr_Id, 'r');
4237 Set_Etype (New_Discr_Id, Etype (Old_Discr));
4238 Set_Scope (New_Discr_Id, Scope (Old_Discr));
4243 if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then
4244 Conformance_Error ("name & does not match!", New_Discr_Id);
4248 -- Default expressions must match
4251 NewD : constant Boolean :=
4252 Present (Expression (New_Discr));
4253 OldD : constant Boolean :=
4254 Present (Expression (Parent (Old_Discr)));
4257 if NewD or OldD then
4259 -- The old default value has been analyzed and expanded,
4260 -- because the current full declaration will have frozen
4261 -- everything before. The new default values have not been
4262 -- expanded, so expand now to check conformance.
4265 Preanalyze_Spec_Expression
4266 (Expression (New_Discr), New_Discr_Type);
4269 if not (NewD and OldD)
4270 or else not Fully_Conformant_Expressions
4271 (Expression (Parent (Old_Discr)),
4272 Expression (New_Discr))
4276 ("default expression for & does not match!",
4283 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4285 if Ada_Version = Ada_83 then
4287 Old_Disc : constant Node_Id := Declaration_Node (Old_Discr);
4290 -- Grouping (use of comma in param lists) must be the same
4291 -- This is where we catch a misconformance like:
4294 -- A : Integer; B : Integer
4296 -- which are represented identically in the tree except
4297 -- for the setting of the flags More_Ids and Prev_Ids.
4299 if More_Ids (Old_Disc) /= More_Ids (New_Discr)
4300 or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr)
4303 ("grouping of & does not match!", New_Discr_Id);
4309 Next_Discriminant (Old_Discr);
4313 if Present (Old_Discr) then
4314 Conformance_Error ("too few discriminants!", Defining_Identifier (N));
4317 elsif Present (New_Discr) then
4319 ("too many discriminants!", Defining_Identifier (New_Discr));
4322 end Check_Discriminant_Conformance;
4324 ----------------------------
4325 -- Check_Fully_Conformant --
4326 ----------------------------
4328 procedure Check_Fully_Conformant
4329 (New_Id : Entity_Id;
4331 Err_Loc : Node_Id := Empty)
4334 pragma Warnings (Off, Result);
4337 (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc);
4338 end Check_Fully_Conformant;
4340 ---------------------------
4341 -- Check_Mode_Conformant --
4342 ---------------------------
4344 procedure Check_Mode_Conformant
4345 (New_Id : Entity_Id;
4347 Err_Loc : Node_Id := Empty;
4348 Get_Inst : Boolean := False)
4351 pragma Warnings (Off, Result);
4354 (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst);
4355 end Check_Mode_Conformant;
4357 --------------------------------
4358 -- Check_Overriding_Indicator --
4359 --------------------------------
4361 procedure Check_Overriding_Indicator
4363 Overridden_Subp : Entity_Id;
4364 Is_Primitive : Boolean)
4370 -- No overriding indicator for literals
4372 if Ekind (Subp) = E_Enumeration_Literal then
4375 elsif Ekind (Subp) = E_Entry then
4376 Decl := Parent (Subp);
4379 Decl := Unit_Declaration_Node (Subp);
4382 if Nkind_In (Decl, N_Subprogram_Body,
4383 N_Subprogram_Body_Stub,
4384 N_Subprogram_Declaration,
4385 N_Abstract_Subprogram_Declaration,
4386 N_Subprogram_Renaming_Declaration)
4388 Spec := Specification (Decl);
4390 elsif Nkind (Decl) = N_Entry_Declaration then
4397 -- The overriding operation is type conformant with the overridden one,
4398 -- but the names of the formals are not required to match. If the names
4399 -- appear permuted in the overriding operation, this is a possible
4400 -- source of confusion that is worth diagnosing. Controlling formals
4401 -- often carry names that reflect the type, and it is not worthwhile
4402 -- requiring that their names match.
4404 if Present (Overridden_Subp)
4405 and then Nkind (Subp) /= N_Defining_Operator_Symbol
4412 Form1 := First_Formal (Subp);
4413 Form2 := First_Formal (Overridden_Subp);
4415 -- If the overriding operation is a synchronized operation, skip
4416 -- the first parameter of the overridden operation, which is
4417 -- implicit in the new one. If the operation is declared in the
4418 -- body it is not primitive and all formals must match.
4420 if Is_Concurrent_Type (Scope (Subp))
4421 and then Is_Tagged_Type (Scope (Subp))
4422 and then not Has_Completion (Scope (Subp))
4424 Form2 := Next_Formal (Form2);
4427 if Present (Form1) then
4428 Form1 := Next_Formal (Form1);
4429 Form2 := Next_Formal (Form2);
4432 while Present (Form1) loop
4433 if not Is_Controlling_Formal (Form1)
4434 and then Present (Next_Formal (Form2))
4435 and then Chars (Form1) = Chars (Next_Formal (Form2))
4437 Error_Msg_Node_2 := Alias (Overridden_Subp);
4438 Error_Msg_Sloc := Sloc (Error_Msg_Node_2);
4439 Error_Msg_NE ("& does not match corresponding formal of&#",
4444 Next_Formal (Form1);
4445 Next_Formal (Form2);
4450 if Present (Overridden_Subp) then
4451 if Must_Not_Override (Spec) then
4452 Error_Msg_Sloc := Sloc (Overridden_Subp);
4454 if Ekind (Subp) = E_Entry then
4456 ("entry & overrides inherited operation #", Spec, Subp);
4459 ("subprogram & overrides inherited operation #", Spec, Subp);
4462 elsif Is_Subprogram (Subp) then
4463 Set_Is_Overriding_Operation (Subp);
4466 -- If primitive flag is set or this is a protected operation, then
4467 -- the operation is overriding at the point of its declaration, so
4468 -- warn if necessary. Otherwise it may have been declared before the
4469 -- operation it overrides and no check is required.
4472 and then not Must_Override (Spec)
4473 and then (Is_Primitive
4474 or else Ekind (Scope (Subp)) = E_Protected_Type)
4476 Style.Missing_Overriding (Decl, Subp);
4479 -- If Subp is an operator, it may override a predefined operation.
4480 -- In that case overridden_subp is empty because of our implicit
4481 -- representation for predefined operators. We have to check whether the
4482 -- signature of Subp matches that of a predefined operator. Note that
4483 -- first argument provides the name of the operator, and the second
4484 -- argument the signature that may match that of a standard operation.
4485 -- If the indicator is overriding, then the operator must match a
4486 -- predefined signature, because we know already that there is no
4487 -- explicit overridden operation.
4489 elsif Nkind (Subp) = N_Defining_Operator_Symbol then
4491 if Must_Not_Override (Spec) then
4493 -- If this is not a primitive operation or protected subprogram,
4494 -- then "not overriding" is illegal.
4497 and then Ekind (Scope (Subp)) /= E_Protected_Type
4500 ("overriding indicator only allowed "
4501 & "if subprogram is primitive", Subp);
4503 elsif Operator_Matches_Spec (Subp, Subp) then
4505 ("subprogram & overrides predefined operator ", Spec, Subp);
4508 elsif Must_Override (Spec) then
4509 if Is_Overriding_Operation (Subp) then
4510 Set_Is_Overriding_Operation (Subp);
4512 elsif not Operator_Matches_Spec (Subp, Subp) then
4513 Error_Msg_NE ("subprogram & is not overriding", Spec, Subp);
4516 elsif not Error_Posted (Subp)
4517 and then Style_Check
4518 and then Operator_Matches_Spec (Subp, Subp)
4520 not Is_Predefined_File_Name
4521 (Unit_File_Name (Get_Source_Unit (Subp)))
4523 Set_Is_Overriding_Operation (Subp);
4525 -- If style checks are enabled, indicate that the indicator is
4526 -- missing. However, at the point of declaration, the type of
4527 -- which this is a primitive operation may be private, in which
4528 -- case the indicator would be premature.
4530 if Has_Private_Declaration (Etype (Subp))
4531 or else Has_Private_Declaration (Etype (First_Formal (Subp)))
4535 Style.Missing_Overriding (Decl, Subp);
4539 elsif Must_Override (Spec) then
4540 if Ekind (Subp) = E_Entry then
4541 Error_Msg_NE ("entry & is not overriding", Spec, Subp);
4543 Error_Msg_NE ("subprogram & is not overriding", Spec, Subp);
4546 -- If the operation is marked "not overriding" and it's not primitive
4547 -- then an error is issued, unless this is an operation of a task or
4548 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4549 -- has been specified have already been checked above.
4551 elsif Must_Not_Override (Spec)
4552 and then not Is_Primitive
4553 and then Ekind (Subp) /= E_Entry
4554 and then Ekind (Scope (Subp)) /= E_Protected_Type
4557 ("overriding indicator only allowed if subprogram is primitive",
4561 end Check_Overriding_Indicator;
4567 -- Note: this procedure needs to know far too much about how the expander
4568 -- messes with exceptions. The use of the flag Exception_Junk and the
4569 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4570 -- works, but is not very clean. It would be better if the expansion
4571 -- routines would leave Original_Node working nicely, and we could use
4572 -- Original_Node here to ignore all the peculiar expander messing ???
4574 procedure Check_Returns
4578 Proc : Entity_Id := Empty)
4582 procedure Check_Statement_Sequence (L : List_Id);
4583 -- Internal recursive procedure to check a list of statements for proper
4584 -- termination by a return statement (or a transfer of control or a
4585 -- compound statement that is itself internally properly terminated).
4587 ------------------------------
4588 -- Check_Statement_Sequence --
4589 ------------------------------
4591 procedure Check_Statement_Sequence (L : List_Id) is
4596 Raise_Exception_Call : Boolean;
4597 -- Set True if statement sequence terminated by Raise_Exception call
4598 -- or a Reraise_Occurrence call.
4601 Raise_Exception_Call := False;
4603 -- Get last real statement
4605 Last_Stm := Last (L);
4607 -- Deal with digging out exception handler statement sequences that
4608 -- have been transformed by the local raise to goto optimization.
4609 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4610 -- optimization has occurred, we are looking at something like:
4613 -- original stmts in block
4617 -- goto L1; | omitted if No_Exception_Propagation
4622 -- goto L3; -- skip handler when exception not raised
4624 -- <<L1>> -- target label for local exception
4638 -- and what we have to do is to dig out the estmts1 and estmts2
4639 -- sequences (which were the original sequences of statements in
4640 -- the exception handlers) and check them.
4642 if Nkind (Last_Stm) = N_Label
4643 and then Exception_Junk (Last_Stm)
4649 exit when Nkind (Stm) /= N_Block_Statement;
4650 exit when not Exception_Junk (Stm);
4653 exit when Nkind (Stm) /= N_Label;
4654 exit when not Exception_Junk (Stm);
4655 Check_Statement_Sequence
4656 (Statements (Handled_Statement_Sequence (Next (Stm))));
4661 exit when Nkind (Stm) /= N_Goto_Statement;
4662 exit when not Exception_Junk (Stm);
4666 -- Don't count pragmas
4668 while Nkind (Last_Stm) = N_Pragma
4670 -- Don't count call to SS_Release (can happen after Raise_Exception)
4673 (Nkind (Last_Stm) = N_Procedure_Call_Statement
4675 Nkind (Name (Last_Stm)) = N_Identifier
4677 Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release))
4679 -- Don't count exception junk
4682 (Nkind_In (Last_Stm, N_Goto_Statement,
4684 N_Object_Declaration)
4685 and then Exception_Junk (Last_Stm))
4686 or else Nkind (Last_Stm) in N_Push_xxx_Label
4687 or else Nkind (Last_Stm) in N_Pop_xxx_Label
4692 -- Here we have the "real" last statement
4694 Kind := Nkind (Last_Stm);
4696 -- Transfer of control, OK. Note that in the No_Return procedure
4697 -- case, we already diagnosed any explicit return statements, so
4698 -- we can treat them as OK in this context.
4700 if Is_Transfer (Last_Stm) then
4703 -- Check cases of explicit non-indirect procedure calls
4705 elsif Kind = N_Procedure_Call_Statement
4706 and then Is_Entity_Name (Name (Last_Stm))
4708 -- Check call to Raise_Exception procedure which is treated
4709 -- specially, as is a call to Reraise_Occurrence.
4711 -- We suppress the warning in these cases since it is likely that
4712 -- the programmer really does not expect to deal with the case
4713 -- of Null_Occurrence, and thus would find a warning about a
4714 -- missing return curious, and raising Program_Error does not
4715 -- seem such a bad behavior if this does occur.
4717 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4718 -- behavior will be to raise Constraint_Error (see AI-329).
4720 if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception)
4722 Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence)
4724 Raise_Exception_Call := True;
4726 -- For Raise_Exception call, test first argument, if it is
4727 -- an attribute reference for a 'Identity call, then we know
4728 -- that the call cannot possibly return.
4731 Arg : constant Node_Id :=
4732 Original_Node (First_Actual (Last_Stm));
4734 if Nkind (Arg) = N_Attribute_Reference
4735 and then Attribute_Name (Arg) = Name_Identity
4742 -- If statement, need to look inside if there is an else and check
4743 -- each constituent statement sequence for proper termination.
4745 elsif Kind = N_If_Statement
4746 and then Present (Else_Statements (Last_Stm))
4748 Check_Statement_Sequence (Then_Statements (Last_Stm));
4749 Check_Statement_Sequence (Else_Statements (Last_Stm));
4751 if Present (Elsif_Parts (Last_Stm)) then
4753 Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm));
4756 while Present (Elsif_Part) loop
4757 Check_Statement_Sequence (Then_Statements (Elsif_Part));
4765 -- Case statement, check each case for proper termination
4767 elsif Kind = N_Case_Statement then
4771 Case_Alt := First_Non_Pragma (Alternatives (Last_Stm));
4772 while Present (Case_Alt) loop
4773 Check_Statement_Sequence (Statements (Case_Alt));
4774 Next_Non_Pragma (Case_Alt);
4780 -- Block statement, check its handled sequence of statements
4782 elsif Kind = N_Block_Statement then
4788 (Handled_Statement_Sequence (Last_Stm), Mode, Err1);
4797 -- Loop statement. If there is an iteration scheme, we can definitely
4798 -- fall out of the loop. Similarly if there is an exit statement, we
4799 -- can fall out. In either case we need a following return.
4801 elsif Kind = N_Loop_Statement then
4802 if Present (Iteration_Scheme (Last_Stm))
4803 or else Has_Exit (Entity (Identifier (Last_Stm)))
4807 -- A loop with no exit statement or iteration scheme is either
4808 -- an infinite loop, or it has some other exit (raise/return).
4809 -- In either case, no warning is required.
4815 -- Timed entry call, check entry call and delay alternatives
4817 -- Note: in expanded code, the timed entry call has been converted
4818 -- to a set of expanded statements on which the check will work
4819 -- correctly in any case.
4821 elsif Kind = N_Timed_Entry_Call then
4823 ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm);
4824 DCA : constant Node_Id := Delay_Alternative (Last_Stm);
4827 -- If statement sequence of entry call alternative is missing,
4828 -- then we can definitely fall through, and we post the error
4829 -- message on the entry call alternative itself.
4831 if No (Statements (ECA)) then
4834 -- If statement sequence of delay alternative is missing, then
4835 -- we can definitely fall through, and we post the error
4836 -- message on the delay alternative itself.
4838 -- Note: if both ECA and DCA are missing the return, then we
4839 -- post only one message, should be enough to fix the bugs.
4840 -- If not we will get a message next time on the DCA when the
4843 elsif No (Statements (DCA)) then
4846 -- Else check both statement sequences
4849 Check_Statement_Sequence (Statements (ECA));
4850 Check_Statement_Sequence (Statements (DCA));
4855 -- Conditional entry call, check entry call and else part
4857 -- Note: in expanded code, the conditional entry call has been
4858 -- converted to a set of expanded statements on which the check
4859 -- will work correctly in any case.
4861 elsif Kind = N_Conditional_Entry_Call then
4863 ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm);
4866 -- If statement sequence of entry call alternative is missing,
4867 -- then we can definitely fall through, and we post the error
4868 -- message on the entry call alternative itself.
4870 if No (Statements (ECA)) then
4873 -- Else check statement sequence and else part
4876 Check_Statement_Sequence (Statements (ECA));
4877 Check_Statement_Sequence (Else_Statements (Last_Stm));
4883 -- If we fall through, issue appropriate message
4886 if not Raise_Exception_Call then
4888 ("?RETURN statement missing following this statement!",
4891 ("\?Program_Error may be raised at run time!",
4895 -- Note: we set Err even though we have not issued a warning
4896 -- because we still have a case of a missing return. This is
4897 -- an extremely marginal case, probably will never be noticed
4898 -- but we might as well get it right.
4902 -- Otherwise we have the case of a procedure marked No_Return
4905 if not Raise_Exception_Call then
4907 ("?implied return after this statement " &
4908 "will raise Program_Error",
4911 ("\?procedure & is marked as No_Return!",
4916 RE : constant Node_Id :=
4917 Make_Raise_Program_Error (Sloc (Last_Stm),
4918 Reason => PE_Implicit_Return);
4920 Insert_After (Last_Stm, RE);
4924 end Check_Statement_Sequence;
4926 -- Start of processing for Check_Returns
4930 Check_Statement_Sequence (Statements (HSS));
4932 if Present (Exception_Handlers (HSS)) then
4933 Handler := First_Non_Pragma (Exception_Handlers (HSS));
4934 while Present (Handler) loop
4935 Check_Statement_Sequence (Statements (Handler));
4936 Next_Non_Pragma (Handler);
4941 ----------------------------
4942 -- Check_Subprogram_Order --
4943 ----------------------------
4945 procedure Check_Subprogram_Order (N : Node_Id) is
4947 function Subprogram_Name_Greater (S1, S2 : String) return Boolean;
4948 -- This is used to check if S1 > S2 in the sense required by this
4949 -- test, for example nameab < namec, but name2 < name10.
4951 -----------------------------
4952 -- Subprogram_Name_Greater --
4953 -----------------------------
4955 function Subprogram_Name_Greater (S1, S2 : String) return Boolean is
4960 -- Remove trailing numeric parts
4963 while S1 (L1) in '0' .. '9' loop
4968 while S2 (L2) in '0' .. '9' loop
4972 -- If non-numeric parts non-equal, that's decisive
4974 if S1 (S1'First .. L1) < S2 (S2'First .. L2) then
4977 elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then
4980 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4981 -- that a missing suffix is treated as numeric zero in this test.
4985 while L1 < S1'Last loop
4987 N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0');
4991 while L2 < S2'Last loop
4993 N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0');
4998 end Subprogram_Name_Greater;
5000 -- Start of processing for Check_Subprogram_Order
5003 -- Check body in alpha order if this is option
5006 and then Style_Check_Order_Subprograms
5007 and then Nkind (N) = N_Subprogram_Body
5008 and then Comes_From_Source (N)
5009 and then In_Extended_Main_Source_Unit (N)
5013 renames Scope_Stack.Table
5014 (Scope_Stack.Last).Last_Subprogram_Name;
5016 Body_Id : constant Entity_Id :=
5017 Defining_Entity (Specification (N));
5020 Get_Decoded_Name_String (Chars (Body_Id));
5023 if Subprogram_Name_Greater
5024 (LSN.all, Name_Buffer (1 .. Name_Len))
5026 Style.Subprogram_Not_In_Alpha_Order (Body_Id);
5032 LSN := new String'(Name_Buffer (1 .. Name_Len));
5035 end Check_Subprogram_Order;
5037 ------------------------------
5038 -- Check_Subtype_Conformant --
5039 ------------------------------
5041 procedure Check_Subtype_Conformant
5042 (New_Id : Entity_Id;
5044 Err_Loc : Node_Id := Empty;
5045 Skip_Controlling_Formals : Boolean := False)
5048 pragma Warnings (Off, Result);
5051 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
5052 Skip_Controlling_Formals => Skip_Controlling_Formals);
5053 end Check_Subtype_Conformant;
5055 ---------------------------
5056 -- Check_Type_Conformant --
5057 ---------------------------
5059 procedure Check_Type_Conformant
5060 (New_Id : Entity_Id;
5062 Err_Loc : Node_Id := Empty)
5065 pragma Warnings (Off, Result);
5068 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
5069 end Check_Type_Conformant;
5071 ----------------------
5072 -- Conforming_Types --
5073 ----------------------
5075 function Conforming_Types
5078 Ctype : Conformance_Type;
5079 Get_Inst : Boolean := False) return Boolean
5081 Type_1 : Entity_Id := T1;
5082 Type_2 : Entity_Id := T2;
5083 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
5085 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
5086 -- If neither T1 nor T2 are generic actual types, or if they are in
5087 -- different scopes (e.g. parent and child instances), then verify that
5088 -- the base types are equal. Otherwise T1 and T2 must be on the same
5089 -- subtype chain. The whole purpose of this procedure is to prevent
5090 -- spurious ambiguities in an instantiation that may arise if two
5091 -- distinct generic types are instantiated with the same actual.
5093 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
5094 -- An access parameter can designate an incomplete type. If the
5095 -- incomplete type is the limited view of a type from a limited_
5096 -- with_clause, check whether the non-limited view is available. If
5097 -- it is a (non-limited) incomplete type, get the full view.
5099 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
5100 -- Returns True if and only if either T1 denotes a limited view of T2
5101 -- or T2 denotes a limited view of T1. This can arise when the limited
5102 -- with view of a type is used in a subprogram declaration and the
5103 -- subprogram body is in the scope of a regular with clause for the
5104 -- same unit. In such a case, the two type entities can be considered
5105 -- identical for purposes of conformance checking.
5107 ----------------------
5108 -- Base_Types_Match --
5109 ----------------------
5111 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
5116 elsif Base_Type (T1) = Base_Type (T2) then
5118 -- The following is too permissive. A more precise test should
5119 -- check that the generic actual is an ancestor subtype of the
5122 return not Is_Generic_Actual_Type (T1)
5123 or else not Is_Generic_Actual_Type (T2)
5124 or else Scope (T1) /= Scope (T2);
5129 end Base_Types_Match;
5131 --------------------------
5132 -- Find_Designated_Type --
5133 --------------------------
5135 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
5139 Desig := Directly_Designated_Type (T);
5141 if Ekind (Desig) = E_Incomplete_Type then
5143 -- If regular incomplete type, get full view if available
5145 if Present (Full_View (Desig)) then
5146 Desig := Full_View (Desig);
5148 -- If limited view of a type, get non-limited view if available,
5149 -- and check again for a regular incomplete type.
5151 elsif Present (Non_Limited_View (Desig)) then
5152 Desig := Get_Full_View (Non_Limited_View (Desig));
5157 end Find_Designated_Type;
5159 -------------------------------
5160 -- Matches_Limited_With_View --
5161 -------------------------------
5163 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
5165 -- In some cases a type imported through a limited_with clause, and
5166 -- its nonlimited view are both visible, for example in an anonymous
5167 -- access-to-class-wide type in a formal. Both entities designate the
5170 if From_With_Type (T1)
5171 and then T2 = Available_View (T1)
5175 elsif From_With_Type (T2)
5176 and then T1 = Available_View (T2)
5183 end Matches_Limited_With_View;
5185 -- Start of processing for Conforming_Types
5188 -- The context is an instance association for a formal
5189 -- access-to-subprogram type; the formal parameter types require
5190 -- mapping because they may denote other formal parameters of the
5194 Type_1 := Get_Instance_Of (T1);
5195 Type_2 := Get_Instance_Of (T2);
5198 -- If one of the types is a view of the other introduced by a limited
5199 -- with clause, treat these as conforming for all purposes.
5201 if Matches_Limited_With_View (T1, T2) then
5204 elsif Base_Types_Match (Type_1, Type_2) then
5205 return Ctype <= Mode_Conformant
5206 or else Subtypes_Statically_Match (Type_1, Type_2);
5208 elsif Is_Incomplete_Or_Private_Type (Type_1)
5209 and then Present (Full_View (Type_1))
5210 and then Base_Types_Match (Full_View (Type_1), Type_2)
5212 return Ctype <= Mode_Conformant
5213 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
5215 elsif Ekind (Type_2) = E_Incomplete_Type
5216 and then Present (Full_View (Type_2))
5217 and then Base_Types_Match (Type_1, Full_View (Type_2))
5219 return Ctype <= Mode_Conformant
5220 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5222 elsif Is_Private_Type (Type_2)
5223 and then In_Instance
5224 and then Present (Full_View (Type_2))
5225 and then Base_Types_Match (Type_1, Full_View (Type_2))
5227 return Ctype <= Mode_Conformant
5228 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5231 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
5232 -- treated recursively because they carry a signature.
5234 Are_Anonymous_Access_To_Subprogram_Types :=
5235 Ekind (Type_1) = Ekind (Type_2)
5237 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
5239 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
5241 -- Test anonymous access type case. For this case, static subtype
5242 -- matching is required for mode conformance (RM 6.3.1(15)). We check
5243 -- the base types because we may have built internal subtype entities
5244 -- to handle null-excluding types (see Process_Formals).
5246 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
5248 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
5249 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
5252 Desig_1 : Entity_Id;
5253 Desig_2 : Entity_Id;
5256 -- In Ada2005, access constant indicators must match for
5257 -- subtype conformance.
5259 if Ada_Version >= Ada_05
5260 and then Ctype >= Subtype_Conformant
5262 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
5267 Desig_1 := Find_Designated_Type (Type_1);
5269 Desig_2 := Find_Designated_Type (Type_2);
5271 -- If the context is an instance association for a formal
5272 -- access-to-subprogram type; formal access parameter designated
5273 -- types require mapping because they may denote other formal
5274 -- parameters of the generic unit.
5277 Desig_1 := Get_Instance_Of (Desig_1);
5278 Desig_2 := Get_Instance_Of (Desig_2);
5281 -- It is possible for a Class_Wide_Type to be introduced for an
5282 -- incomplete type, in which case there is a separate class_ wide
5283 -- type for the full view. The types conform if their Etypes
5284 -- conform, i.e. one may be the full view of the other. This can
5285 -- only happen in the context of an access parameter, other uses
5286 -- of an incomplete Class_Wide_Type are illegal.
5288 if Is_Class_Wide_Type (Desig_1)
5289 and then Is_Class_Wide_Type (Desig_2)
5293 (Etype (Base_Type (Desig_1)),
5294 Etype (Base_Type (Desig_2)), Ctype);
5296 elsif Are_Anonymous_Access_To_Subprogram_Types then
5297 if Ada_Version < Ada_05 then
5298 return Ctype = Type_Conformant
5300 Subtypes_Statically_Match (Desig_1, Desig_2);
5302 -- We must check the conformance of the signatures themselves
5306 Conformant : Boolean;
5309 (Desig_1, Desig_2, Ctype, False, Conformant);
5315 return Base_Type (Desig_1) = Base_Type (Desig_2)
5316 and then (Ctype = Type_Conformant
5318 Subtypes_Statically_Match (Desig_1, Desig_2));
5322 -- Otherwise definitely no match
5325 if ((Ekind (Type_1) = E_Anonymous_Access_Type
5326 and then Is_Access_Type (Type_2))
5327 or else (Ekind (Type_2) = E_Anonymous_Access_Type
5328 and then Is_Access_Type (Type_1)))
5331 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
5333 May_Hide_Profile := True;
5338 end Conforming_Types;
5340 --------------------------
5341 -- Create_Extra_Formals --
5342 --------------------------
5344 procedure Create_Extra_Formals (E : Entity_Id) is
5346 First_Extra : Entity_Id := Empty;
5347 Last_Extra : Entity_Id;
5348 Formal_Type : Entity_Id;
5349 P_Formal : Entity_Id := Empty;
5351 function Add_Extra_Formal
5352 (Assoc_Entity : Entity_Id;
5355 Suffix : String) return Entity_Id;
5356 -- Add an extra formal to the current list of formals and extra formals.
5357 -- The extra formal is added to the end of the list of extra formals,
5358 -- and also returned as the result. These formals are always of mode IN.
5359 -- The new formal has the type Typ, is declared in Scope, and its name
5360 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5362 ----------------------
5363 -- Add_Extra_Formal --
5364 ----------------------
5366 function Add_Extra_Formal
5367 (Assoc_Entity : Entity_Id;
5370 Suffix : String) return Entity_Id
5372 EF : constant Entity_Id :=
5373 Make_Defining_Identifier (Sloc (Assoc_Entity),
5374 Chars => New_External_Name (Chars (Assoc_Entity),
5378 -- A little optimization. Never generate an extra formal for the
5379 -- _init operand of an initialization procedure, since it could
5382 if Chars (Formal) = Name_uInit then
5386 Set_Ekind (EF, E_In_Parameter);
5387 Set_Actual_Subtype (EF, Typ);
5388 Set_Etype (EF, Typ);
5389 Set_Scope (EF, Scope);
5390 Set_Mechanism (EF, Default_Mechanism);
5391 Set_Formal_Validity (EF);
5393 if No (First_Extra) then
5395 Set_Extra_Formals (Scope, First_Extra);
5398 if Present (Last_Extra) then
5399 Set_Extra_Formal (Last_Extra, EF);
5405 end Add_Extra_Formal;
5407 -- Start of processing for Create_Extra_Formals
5410 -- We never generate extra formals if expansion is not active
5411 -- because we don't need them unless we are generating code.
5413 if not Expander_Active then
5417 -- If this is a derived subprogram then the subtypes of the parent
5418 -- subprogram's formal parameters will be used to determine the need
5419 -- for extra formals.
5421 if Is_Overloadable (E) and then Present (Alias (E)) then
5422 P_Formal := First_Formal (Alias (E));
5425 Last_Extra := Empty;
5426 Formal := First_Formal (E);
5427 while Present (Formal) loop
5428 Last_Extra := Formal;
5429 Next_Formal (Formal);
5432 -- If Extra_formals were already created, don't do it again. This
5433 -- situation may arise for subprogram types created as part of
5434 -- dispatching calls (see Expand_Dispatching_Call)
5436 if Present (Last_Extra) and then
5437 Present (Extra_Formal (Last_Extra))
5442 -- If the subprogram is a predefined dispatching subprogram then don't
5443 -- generate any extra constrained or accessibility level formals. In
5444 -- general we suppress these for internal subprograms (by not calling
5445 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5446 -- generated stream attributes do get passed through because extra
5447 -- build-in-place formals are needed in some cases (limited 'Input).
5449 if Is_Predefined_Dispatching_Operation (E) then
5450 goto Test_For_BIP_Extras;
5453 Formal := First_Formal (E);
5454 while Present (Formal) loop
5456 -- Create extra formal for supporting the attribute 'Constrained.
5457 -- The case of a private type view without discriminants also
5458 -- requires the extra formal if the underlying type has defaulted
5461 if Ekind (Formal) /= E_In_Parameter then
5462 if Present (P_Formal) then
5463 Formal_Type := Etype (P_Formal);
5465 Formal_Type := Etype (Formal);
5468 -- Do not produce extra formals for Unchecked_Union parameters.
5469 -- Jump directly to the end of the loop.
5471 if Is_Unchecked_Union (Base_Type (Formal_Type)) then
5472 goto Skip_Extra_Formal_Generation;
5475 if not Has_Discriminants (Formal_Type)
5476 and then Ekind (Formal_Type) in Private_Kind
5477 and then Present (Underlying_Type (Formal_Type))
5479 Formal_Type := Underlying_Type (Formal_Type);
5482 if Has_Discriminants (Formal_Type)
5483 and then not Is_Constrained (Formal_Type)
5484 and then not Is_Indefinite_Subtype (Formal_Type)
5486 Set_Extra_Constrained
5487 (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "F"));
5491 -- Create extra formal for supporting accessibility checking. This
5492 -- is done for both anonymous access formals and formals of named
5493 -- access types that are marked as controlling formals. The latter
5494 -- case can occur when Expand_Dispatching_Call creates a subprogram
5495 -- type and substitutes the types of access-to-class-wide actuals
5496 -- for the anonymous access-to-specific-type of controlling formals.
5497 -- Base_Type is applied because in cases where there is a null
5498 -- exclusion the formal may have an access subtype.
5500 -- This is suppressed if we specifically suppress accessibility
5501 -- checks at the package level for either the subprogram, or the
5502 -- package in which it resides. However, we do not suppress it
5503 -- simply if the scope has accessibility checks suppressed, since
5504 -- this could cause trouble when clients are compiled with a
5505 -- different suppression setting. The explicit checks at the
5506 -- package level are safe from this point of view.
5508 if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type
5509 or else (Is_Controlling_Formal (Formal)
5510 and then Is_Access_Type (Base_Type (Etype (Formal)))))
5512 (Explicit_Suppress (E, Accessibility_Check)
5514 Explicit_Suppress (Scope (E), Accessibility_Check))
5517 or else Present (Extra_Accessibility (P_Formal)))
5519 Set_Extra_Accessibility
5520 (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "F"));
5523 -- This label is required when skipping extra formal generation for
5524 -- Unchecked_Union parameters.
5526 <<Skip_Extra_Formal_Generation>>
5528 if Present (P_Formal) then
5529 Next_Formal (P_Formal);
5532 Next_Formal (Formal);
5535 <<Test_For_BIP_Extras>>
5537 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5538 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5540 if Ada_Version >= Ada_05 and then Is_Build_In_Place_Function (E) then
5542 Result_Subt : constant Entity_Id := Etype (E);
5544 Discard : Entity_Id;
5545 pragma Warnings (Off, Discard);
5548 -- In the case of functions with unconstrained result subtypes,
5549 -- add a 3-state formal indicating whether the return object is
5550 -- allocated by the caller (0), or should be allocated by the
5551 -- callee on the secondary stack (1) or in the global heap (2).
5552 -- For the moment we just use Natural for the type of this formal.
5553 -- Note that this formal isn't usually needed in the case where
5554 -- the result subtype is constrained, but it is needed when the
5555 -- function has a tagged result, because generally such functions
5556 -- can be called in a dispatching context and such calls must be
5557 -- handled like calls to a class-wide function.
5559 if not Is_Constrained (Underlying_Type (Result_Subt))
5560 or else Is_Tagged_Type (Underlying_Type (Result_Subt))
5564 (E, Standard_Natural,
5565 E, BIP_Formal_Suffix (BIP_Alloc_Form));
5568 -- In the case of functions whose result type has controlled
5569 -- parts, we have an extra formal of type
5570 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5571 -- is, we are passing a pointer to a finalization list (which is
5572 -- itself a pointer). This extra formal is then passed along to
5573 -- Move_Final_List in case of successful completion of a return
5574 -- statement. We cannot pass an 'in out' parameter, because we
5575 -- need to update the finalization list during an abort-deferred
5576 -- region, rather than using copy-back after the function
5577 -- returns. This is true even if we are able to get away with
5578 -- having 'in out' parameters, which are normally illegal for
5579 -- functions. This formal is also needed when the function has
5582 if Needs_BIP_Final_List (E) then
5585 (E, RTE (RE_Finalizable_Ptr_Ptr),
5586 E, BIP_Formal_Suffix (BIP_Final_List));
5589 -- If the result type contains tasks, we have two extra formals:
5590 -- the master of the tasks to be created, and the caller's
5591 -- activation chain.
5593 if Has_Task (Result_Subt) then
5596 (E, RTE (RE_Master_Id),
5597 E, BIP_Formal_Suffix (BIP_Master));
5600 (E, RTE (RE_Activation_Chain_Access),
5601 E, BIP_Formal_Suffix (BIP_Activation_Chain));
5604 -- All build-in-place functions get an extra formal that will be
5605 -- passed the address of the return object within the caller.
5608 Formal_Type : constant Entity_Id :=
5610 (E_Anonymous_Access_Type, E,
5611 Scope_Id => Scope (E));
5613 Set_Directly_Designated_Type (Formal_Type, Result_Subt);
5614 Set_Etype (Formal_Type, Formal_Type);
5615 Set_Depends_On_Private
5616 (Formal_Type, Has_Private_Component (Formal_Type));
5617 Set_Is_Public (Formal_Type, Is_Public (Scope (Formal_Type)));
5618 Set_Is_Access_Constant (Formal_Type, False);
5620 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5621 -- the designated type comes from the limited view (for
5622 -- back-end purposes).
5624 Set_From_With_Type (Formal_Type, From_With_Type (Result_Subt));
5626 Layout_Type (Formal_Type);
5630 (E, Formal_Type, E, BIP_Formal_Suffix (BIP_Object_Access));
5634 end Create_Extra_Formals;
5636 -----------------------------
5637 -- Enter_Overloaded_Entity --
5638 -----------------------------
5640 procedure Enter_Overloaded_Entity (S : Entity_Id) is
5641 E : Entity_Id := Current_Entity_In_Scope (S);
5642 C_E : Entity_Id := Current_Entity (S);
5646 Set_Has_Homonym (E);
5647 Set_Has_Homonym (S);
5650 Set_Is_Immediately_Visible (S);
5651 Set_Scope (S, Current_Scope);
5653 -- Chain new entity if front of homonym in current scope, so that
5654 -- homonyms are contiguous.
5659 while Homonym (C_E) /= E loop
5660 C_E := Homonym (C_E);
5663 Set_Homonym (C_E, S);
5667 Set_Current_Entity (S);
5672 Append_Entity (S, Current_Scope);
5673 Set_Public_Status (S);
5675 if Debug_Flag_E then
5676 Write_Str ("New overloaded entity chain: ");
5677 Write_Name (Chars (S));
5680 while Present (E) loop
5681 Write_Str (" "); Write_Int (Int (E));
5688 -- Generate warning for hiding
5691 and then Comes_From_Source (S)
5692 and then In_Extended_Main_Source_Unit (S)
5699 -- Warn unless genuine overloading
5701 if (not Is_Overloadable (E) or else Subtype_Conformant (E, S))
5702 and then (Is_Immediately_Visible (E)
5704 Is_Potentially_Use_Visible (S))
5706 Error_Msg_Sloc := Sloc (E);
5707 Error_Msg_N ("declaration of & hides one#?", S);
5711 end Enter_Overloaded_Entity;
5713 -----------------------------
5714 -- Find_Corresponding_Spec --
5715 -----------------------------
5717 function Find_Corresponding_Spec
5719 Post_Error : Boolean := True) return Entity_Id
5721 Spec : constant Node_Id := Specification (N);
5722 Designator : constant Entity_Id := Defining_Entity (Spec);
5727 E := Current_Entity (Designator);
5728 while Present (E) loop
5730 -- We are looking for a matching spec. It must have the same scope,
5731 -- and the same name, and either be type conformant, or be the case
5732 -- of a library procedure spec and its body (which belong to one
5733 -- another regardless of whether they are type conformant or not).
5735 if Scope (E) = Current_Scope then
5736 if Current_Scope = Standard_Standard
5737 or else (Ekind (E) = Ekind (Designator)
5738 and then Type_Conformant (E, Designator))
5740 -- Within an instantiation, we know that spec and body are
5741 -- subtype conformant, because they were subtype conformant
5742 -- in the generic. We choose the subtype-conformant entity
5743 -- here as well, to resolve spurious ambiguities in the
5744 -- instance that were not present in the generic (i.e. when
5745 -- two different types are given the same actual). If we are
5746 -- looking for a spec to match a body, full conformance is
5750 Set_Convention (Designator, Convention (E));
5752 if Nkind (N) = N_Subprogram_Body
5753 and then Present (Homonym (E))
5754 and then not Fully_Conformant (E, Designator)
5758 elsif not Subtype_Conformant (E, Designator) then
5763 if not Has_Completion (E) then
5764 if Nkind (N) /= N_Subprogram_Body_Stub then
5765 Set_Corresponding_Spec (N, E);
5768 Set_Has_Completion (E);
5771 elsif Nkind (Parent (N)) = N_Subunit then
5773 -- If this is the proper body of a subunit, the completion
5774 -- flag is set when analyzing the stub.
5778 -- If E is an internal function with a controlling result
5779 -- that was created for an operation inherited by a null
5780 -- extension, it may be overridden by a body without a previous
5781 -- spec (one more reason why these should be shunned). In that
5782 -- case remove the generated body, because the current one is
5783 -- the explicit overriding.
5785 elsif Ekind (E) = E_Function
5786 and then Ada_Version >= Ada_05
5787 and then not Comes_From_Source (E)
5788 and then Has_Controlling_Result (E)
5789 and then Is_Null_Extension (Etype (E))
5790 and then Comes_From_Source (Spec)
5792 Set_Has_Completion (E, False);
5794 if Expander_Active then
5796 (Unit_Declaration_Node
5797 (Corresponding_Body (Unit_Declaration_Node (E))));
5800 -- If expansion is disabled, the wrapper function has not
5801 -- been generated, and this is the standard case of a late
5802 -- body overriding an inherited operation.
5808 -- If the body already exists, then this is an error unless
5809 -- the previous declaration is the implicit declaration of a
5810 -- derived subprogram, or this is a spurious overloading in an
5813 elsif No (Alias (E))
5814 and then not Is_Intrinsic_Subprogram (E)
5815 and then not In_Instance
5818 Error_Msg_Sloc := Sloc (E);
5820 if Is_Imported (E) then
5822 ("body not allowed for imported subprogram & declared#",
5825 Error_Msg_NE ("duplicate body for & declared#", N, E);
5829 -- Child units cannot be overloaded, so a conformance mismatch
5830 -- between body and a previous spec is an error.
5832 elsif Is_Child_Unit (E)
5834 Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body
5836 Nkind (Parent (Unit_Declaration_Node (Designator))) =
5841 ("body of child unit does not match previous declaration", N);
5849 -- On exit, we know that no previous declaration of subprogram exists
5852 end Find_Corresponding_Spec;
5854 ----------------------
5855 -- Fully_Conformant --
5856 ----------------------
5858 function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is
5861 Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result);
5863 end Fully_Conformant;
5865 ----------------------------------
5866 -- Fully_Conformant_Expressions --
5867 ----------------------------------
5869 function Fully_Conformant_Expressions
5870 (Given_E1 : Node_Id;
5871 Given_E2 : Node_Id) return Boolean
5873 E1 : constant Node_Id := Original_Node (Given_E1);
5874 E2 : constant Node_Id := Original_Node (Given_E2);
5875 -- We always test conformance on original nodes, since it is possible
5876 -- for analysis and/or expansion to make things look as though they
5877 -- conform when they do not, e.g. by converting 1+2 into 3.
5879 function FCE (Given_E1, Given_E2 : Node_Id) return Boolean
5880 renames Fully_Conformant_Expressions;
5882 function FCL (L1, L2 : List_Id) return Boolean;
5883 -- Compare elements of two lists for conformance. Elements have to
5884 -- be conformant, and actuals inserted as default parameters do not
5885 -- match explicit actuals with the same value.
5887 function FCO (Op_Node, Call_Node : Node_Id) return Boolean;
5888 -- Compare an operator node with a function call
5894 function FCL (L1, L2 : List_Id) return Boolean is
5898 if L1 = No_List then
5904 if L2 = No_List then
5910 -- Compare two lists, skipping rewrite insertions (we want to
5911 -- compare the original trees, not the expanded versions!)
5914 if Is_Rewrite_Insertion (N1) then
5916 elsif Is_Rewrite_Insertion (N2) then
5922 elsif not FCE (N1, N2) then
5935 function FCO (Op_Node, Call_Node : Node_Id) return Boolean is
5936 Actuals : constant List_Id := Parameter_Associations (Call_Node);
5941 or else Entity (Op_Node) /= Entity (Name (Call_Node))
5946 Act := First (Actuals);
5948 if Nkind (Op_Node) in N_Binary_Op then
5949 if not FCE (Left_Opnd (Op_Node), Act) then
5956 return Present (Act)
5957 and then FCE (Right_Opnd (Op_Node), Act)
5958 and then No (Next (Act));
5962 -- Start of processing for Fully_Conformant_Expressions
5965 -- Non-conformant if paren count does not match. Note: if some idiot
5966 -- complains that we don't do this right for more than 3 levels of
5967 -- parentheses, they will be treated with the respect they deserve!
5969 if Paren_Count (E1) /= Paren_Count (E2) then
5972 -- If same entities are referenced, then they are conformant even if
5973 -- they have different forms (RM 8.3.1(19-20)).
5975 elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then
5976 if Present (Entity (E1)) then
5977 return Entity (E1) = Entity (E2)
5978 or else (Chars (Entity (E1)) = Chars (Entity (E2))
5979 and then Ekind (Entity (E1)) = E_Discriminant
5980 and then Ekind (Entity (E2)) = E_In_Parameter);
5982 elsif Nkind (E1) = N_Expanded_Name
5983 and then Nkind (E2) = N_Expanded_Name
5984 and then Nkind (Selector_Name (E1)) = N_Character_Literal
5985 and then Nkind (Selector_Name (E2)) = N_Character_Literal
5987 return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2));
5990 -- Identifiers in component associations don't always have
5991 -- entities, but their names must conform.
5993 return Nkind (E1) = N_Identifier
5994 and then Nkind (E2) = N_Identifier
5995 and then Chars (E1) = Chars (E2);
5998 elsif Nkind (E1) = N_Character_Literal
5999 and then Nkind (E2) = N_Expanded_Name
6001 return Nkind (Selector_Name (E2)) = N_Character_Literal
6002 and then Chars (E1) = Chars (Selector_Name (E2));
6004 elsif Nkind (E2) = N_Character_Literal
6005 and then Nkind (E1) = N_Expanded_Name
6007 return Nkind (Selector_Name (E1)) = N_Character_Literal
6008 and then Chars (E2) = Chars (Selector_Name (E1));
6010 elsif Nkind (E1) in N_Op
6011 and then Nkind (E2) = N_Function_Call
6013 return FCO (E1, E2);
6015 elsif Nkind (E2) in N_Op
6016 and then Nkind (E1) = N_Function_Call
6018 return FCO (E2, E1);
6020 -- Otherwise we must have the same syntactic entity
6022 elsif Nkind (E1) /= Nkind (E2) then
6025 -- At this point, we specialize by node type
6032 FCL (Expressions (E1), Expressions (E2))
6033 and then FCL (Component_Associations (E1),
6034 Component_Associations (E2));
6037 if Nkind (Expression (E1)) = N_Qualified_Expression
6039 Nkind (Expression (E2)) = N_Qualified_Expression
6041 return FCE (Expression (E1), Expression (E2));
6043 -- Check that the subtype marks and any constraints
6048 Indic1 : constant Node_Id := Expression (E1);
6049 Indic2 : constant Node_Id := Expression (E2);
6054 if Nkind (Indic1) /= N_Subtype_Indication then
6056 Nkind (Indic2) /= N_Subtype_Indication
6057 and then Entity (Indic1) = Entity (Indic2);
6059 elsif Nkind (Indic2) /= N_Subtype_Indication then
6061 Nkind (Indic1) /= N_Subtype_Indication
6062 and then Entity (Indic1) = Entity (Indic2);
6065 if Entity (Subtype_Mark (Indic1)) /=
6066 Entity (Subtype_Mark (Indic2))
6071 Elt1 := First (Constraints (Constraint (Indic1)));
6072 Elt2 := First (Constraints (Constraint (Indic2)));
6073 while Present (Elt1) and then Present (Elt2) loop
6074 if not FCE (Elt1, Elt2) then
6087 when N_Attribute_Reference =>
6089 Attribute_Name (E1) = Attribute_Name (E2)
6090 and then FCL (Expressions (E1), Expressions (E2));
6094 Entity (E1) = Entity (E2)
6095 and then FCE (Left_Opnd (E1), Left_Opnd (E2))
6096 and then FCE (Right_Opnd (E1), Right_Opnd (E2));
6098 when N_Short_Circuit | N_Membership_Test =>
6100 FCE (Left_Opnd (E1), Left_Opnd (E2))
6102 FCE (Right_Opnd (E1), Right_Opnd (E2));
6104 when N_Character_Literal =>
6106 Char_Literal_Value (E1) = Char_Literal_Value (E2);
6108 when N_Component_Association =>
6110 FCL (Choices (E1), Choices (E2))
6111 and then FCE (Expression (E1), Expression (E2));
6113 when N_Conditional_Expression =>
6115 FCL (Expressions (E1), Expressions (E2));
6117 when N_Explicit_Dereference =>
6119 FCE (Prefix (E1), Prefix (E2));
6121 when N_Extension_Aggregate =>
6123 FCL (Expressions (E1), Expressions (E2))
6124 and then Null_Record_Present (E1) =
6125 Null_Record_Present (E2)
6126 and then FCL (Component_Associations (E1),
6127 Component_Associations (E2));
6129 when N_Function_Call =>
6131 FCE (Name (E1), Name (E2))
6132 and then FCL (Parameter_Associations (E1),
6133 Parameter_Associations (E2));
6135 when N_Indexed_Component =>
6137 FCE (Prefix (E1), Prefix (E2))
6138 and then FCL (Expressions (E1), Expressions (E2));
6140 when N_Integer_Literal =>
6141 return (Intval (E1) = Intval (E2));
6146 when N_Operator_Symbol =>
6148 Chars (E1) = Chars (E2);
6150 when N_Others_Choice =>
6153 when N_Parameter_Association =>
6155 Chars (Selector_Name (E1)) = Chars (Selector_Name (E2))
6156 and then FCE (Explicit_Actual_Parameter (E1),
6157 Explicit_Actual_Parameter (E2));
6159 when N_Qualified_Expression =>
6161 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6162 and then FCE (Expression (E1), Expression (E2));
6166 FCE (Low_Bound (E1), Low_Bound (E2))
6167 and then FCE (High_Bound (E1), High_Bound (E2));
6169 when N_Real_Literal =>
6170 return (Realval (E1) = Realval (E2));
6172 when N_Selected_Component =>
6174 FCE (Prefix (E1), Prefix (E2))
6175 and then FCE (Selector_Name (E1), Selector_Name (E2));
6179 FCE (Prefix (E1), Prefix (E2))
6180 and then FCE (Discrete_Range (E1), Discrete_Range (E2));
6182 when N_String_Literal =>
6184 S1 : constant String_Id := Strval (E1);
6185 S2 : constant String_Id := Strval (E2);
6186 L1 : constant Nat := String_Length (S1);
6187 L2 : constant Nat := String_Length (S2);
6194 for J in 1 .. L1 loop
6195 if Get_String_Char (S1, J) /=
6196 Get_String_Char (S2, J)
6206 when N_Type_Conversion =>
6208 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6209 and then FCE (Expression (E1), Expression (E2));
6213 Entity (E1) = Entity (E2)
6214 and then FCE (Right_Opnd (E1), Right_Opnd (E2));
6216 when N_Unchecked_Type_Conversion =>
6218 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6219 and then FCE (Expression (E1), Expression (E2));
6221 -- All other node types cannot appear in this context. Strictly
6222 -- we should raise a fatal internal error. Instead we just ignore
6223 -- the nodes. This means that if anyone makes a mistake in the
6224 -- expander and mucks an expression tree irretrievably, the
6225 -- result will be a failure to detect a (probably very obscure)
6226 -- case of non-conformance, which is better than bombing on some
6227 -- case where two expressions do in fact conform.
6234 end Fully_Conformant_Expressions;
6236 ----------------------------------------
6237 -- Fully_Conformant_Discrete_Subtypes --
6238 ----------------------------------------
6240 function Fully_Conformant_Discrete_Subtypes
6241 (Given_S1 : Node_Id;
6242 Given_S2 : Node_Id) return Boolean
6244 S1 : constant Node_Id := Original_Node (Given_S1);
6245 S2 : constant Node_Id := Original_Node (Given_S2);
6247 function Conforming_Bounds (B1, B2 : Node_Id) return Boolean;
6248 -- Special-case for a bound given by a discriminant, which in the body
6249 -- is replaced with the discriminal of the enclosing type.
6251 function Conforming_Ranges (R1, R2 : Node_Id) return Boolean;
6252 -- Check both bounds
6254 -----------------------
6255 -- Conforming_Bounds --
6256 -----------------------
6258 function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is
6260 if Is_Entity_Name (B1)
6261 and then Is_Entity_Name (B2)
6262 and then Ekind (Entity (B1)) = E_Discriminant
6264 return Chars (B1) = Chars (B2);
6267 return Fully_Conformant_Expressions (B1, B2);
6269 end Conforming_Bounds;
6271 -----------------------
6272 -- Conforming_Ranges --
6273 -----------------------
6275 function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is
6278 Conforming_Bounds (Low_Bound (R1), Low_Bound (R2))
6280 Conforming_Bounds (High_Bound (R1), High_Bound (R2));
6281 end Conforming_Ranges;
6283 -- Start of processing for Fully_Conformant_Discrete_Subtypes
6286 if Nkind (S1) /= Nkind (S2) then
6289 elsif Is_Entity_Name (S1) then
6290 return Entity (S1) = Entity (S2);
6292 elsif Nkind (S1) = N_Range then
6293 return Conforming_Ranges (S1, S2);
6295 elsif Nkind (S1) = N_Subtype_Indication then
6297 Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2))
6300 (Range_Expression (Constraint (S1)),
6301 Range_Expression (Constraint (S2)));
6305 end Fully_Conformant_Discrete_Subtypes;
6307 --------------------
6308 -- Install_Entity --
6309 --------------------
6311 procedure Install_Entity (E : Entity_Id) is
6312 Prev : constant Entity_Id := Current_Entity (E);
6314 Set_Is_Immediately_Visible (E);
6315 Set_Current_Entity (E);
6316 Set_Homonym (E, Prev);
6319 ---------------------
6320 -- Install_Formals --
6321 ---------------------
6323 procedure Install_Formals (Id : Entity_Id) is
6326 F := First_Formal (Id);
6327 while Present (F) loop
6331 end Install_Formals;
6333 -----------------------------
6334 -- Is_Interface_Conformant --
6335 -----------------------------
6337 function Is_Interface_Conformant
6338 (Tagged_Type : Entity_Id;
6339 Iface_Prim : Entity_Id;
6340 Prim : Entity_Id) return Boolean
6342 Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim);
6343 Typ : constant Entity_Id := Find_Dispatching_Type (Prim);
6346 pragma Assert (Is_Subprogram (Iface_Prim)
6347 and then Is_Subprogram (Prim)
6348 and then Is_Dispatching_Operation (Iface_Prim)
6349 and then Is_Dispatching_Operation (Prim));
6351 pragma Assert (Is_Interface (Iface)
6352 or else (Present (Alias (Iface_Prim))
6355 (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)))));
6357 if Prim = Iface_Prim
6358 or else not Is_Subprogram (Prim)
6359 or else Ekind (Prim) /= Ekind (Iface_Prim)
6360 or else not Is_Dispatching_Operation (Prim)
6361 or else Scope (Prim) /= Scope (Tagged_Type)
6363 or else Base_Type (Typ) /= Tagged_Type
6364 or else not Primitive_Names_Match (Iface_Prim, Prim)
6368 -- Case of a procedure, or a function that does not have a controlling
6369 -- result (I or access I).
6371 elsif Ekind (Iface_Prim) = E_Procedure
6372 or else Etype (Prim) = Etype (Iface_Prim)
6373 or else not Has_Controlling_Result (Prim)
6375 return Type_Conformant (Prim, Iface_Prim,
6376 Skip_Controlling_Formals => True);
6378 -- Case of a function returning an interface, or an access to one.
6379 -- Check that the return types correspond.
6381 elsif Implements_Interface (Typ, Iface) then
6382 if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type)
6384 (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type)
6389 Type_Conformant (Prim, Iface_Prim,
6390 Skip_Controlling_Formals => True);
6396 end Is_Interface_Conformant;
6398 ---------------------------------
6399 -- Is_Non_Overriding_Operation --
6400 ---------------------------------
6402 function Is_Non_Overriding_Operation
6403 (Prev_E : Entity_Id;
6404 New_E : Entity_Id) return Boolean
6408 G_Typ : Entity_Id := Empty;
6410 function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id;
6411 -- If F_Type is a derived type associated with a generic actual subtype,
6412 -- then return its Generic_Parent_Type attribute, else return Empty.
6414 function Types_Correspond
6415 (P_Type : Entity_Id;
6416 N_Type : Entity_Id) return Boolean;
6417 -- Returns true if and only if the types (or designated types in the
6418 -- case of anonymous access types) are the same or N_Type is derived
6419 -- directly or indirectly from P_Type.
6421 -----------------------------
6422 -- Get_Generic_Parent_Type --
6423 -----------------------------
6425 function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is
6430 if Is_Derived_Type (F_Typ)
6431 and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration
6433 -- The tree must be traversed to determine the parent subtype in
6434 -- the generic unit, which unfortunately isn't always available
6435 -- via semantic attributes. ??? (Note: The use of Original_Node
6436 -- is needed for cases where a full derived type has been
6439 Indic := Subtype_Indication
6440 (Type_Definition (Original_Node (Parent (F_Typ))));
6442 if Nkind (Indic) = N_Subtype_Indication then
6443 G_Typ := Entity (Subtype_Mark (Indic));
6445 G_Typ := Entity (Indic);
6448 if Nkind (Parent (G_Typ)) = N_Subtype_Declaration
6449 and then Present (Generic_Parent_Type (Parent (G_Typ)))
6451 return Generic_Parent_Type (Parent (G_Typ));
6456 end Get_Generic_Parent_Type;
6458 ----------------------
6459 -- Types_Correspond --
6460 ----------------------
6462 function Types_Correspond
6463 (P_Type : Entity_Id;
6464 N_Type : Entity_Id) return Boolean
6466 Prev_Type : Entity_Id := Base_Type (P_Type);
6467 New_Type : Entity_Id := Base_Type (N_Type);
6470 if Ekind (Prev_Type) = E_Anonymous_Access_Type then
6471 Prev_Type := Designated_Type (Prev_Type);
6474 if Ekind (New_Type) = E_Anonymous_Access_Type then
6475 New_Type := Designated_Type (New_Type);
6478 if Prev_Type = New_Type then
6481 elsif not Is_Class_Wide_Type (New_Type) then
6482 while Etype (New_Type) /= New_Type loop
6483 New_Type := Etype (New_Type);
6484 if New_Type = Prev_Type then
6490 end Types_Correspond;
6492 -- Start of processing for Is_Non_Overriding_Operation
6495 -- In the case where both operations are implicit derived subprograms
6496 -- then neither overrides the other. This can only occur in certain
6497 -- obscure cases (e.g., derivation from homographs created in a generic
6500 if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then
6503 elsif Ekind (Current_Scope) = E_Package
6504 and then Is_Generic_Instance (Current_Scope)
6505 and then In_Private_Part (Current_Scope)
6506 and then Comes_From_Source (New_E)
6508 -- We examine the formals and result subtype of the inherited
6509 -- operation, to determine whether their type is derived from (the
6510 -- instance of) a generic type.
6512 Formal := First_Formal (Prev_E);
6514 while Present (Formal) loop
6515 F_Typ := Base_Type (Etype (Formal));
6517 if Ekind (F_Typ) = E_Anonymous_Access_Type then
6518 F_Typ := Designated_Type (F_Typ);
6521 G_Typ := Get_Generic_Parent_Type (F_Typ);
6523 Next_Formal (Formal);
6526 if No (G_Typ) and then Ekind (Prev_E) = E_Function then
6527 G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E)));
6534 -- If the generic type is a private type, then the original operation
6535 -- was not overriding in the generic, because there was no primitive
6536 -- operation to override.
6538 if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration
6539 and then Nkind (Formal_Type_Definition (Parent (G_Typ))) =
6540 N_Formal_Private_Type_Definition
6544 -- The generic parent type is the ancestor of a formal derived
6545 -- type declaration. We need to check whether it has a primitive
6546 -- operation that should be overridden by New_E in the generic.
6550 P_Formal : Entity_Id;
6551 N_Formal : Entity_Id;
6555 Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ));
6558 while Present (Prim_Elt) loop
6559 P_Prim := Node (Prim_Elt);
6561 if Chars (P_Prim) = Chars (New_E)
6562 and then Ekind (P_Prim) = Ekind (New_E)
6564 P_Formal := First_Formal (P_Prim);
6565 N_Formal := First_Formal (New_E);
6566 while Present (P_Formal) and then Present (N_Formal) loop
6567 P_Typ := Etype (P_Formal);
6568 N_Typ := Etype (N_Formal);
6570 if not Types_Correspond (P_Typ, N_Typ) then
6574 Next_Entity (P_Formal);
6575 Next_Entity (N_Formal);
6578 -- Found a matching primitive operation belonging to the
6579 -- formal ancestor type, so the new subprogram is
6583 and then No (N_Formal)
6584 and then (Ekind (New_E) /= E_Function
6587 (Etype (P_Prim), Etype (New_E)))
6593 Next_Elmt (Prim_Elt);
6596 -- If no match found, then the new subprogram does not
6597 -- override in the generic (nor in the instance).
6605 end Is_Non_Overriding_Operation;
6607 ------------------------------
6608 -- Make_Inequality_Operator --
6609 ------------------------------
6611 -- S is the defining identifier of an equality operator. We build a
6612 -- subprogram declaration with the right signature. This operation is
6613 -- intrinsic, because it is always expanded as the negation of the
6614 -- call to the equality function.
6616 procedure Make_Inequality_Operator (S : Entity_Id) is
6617 Loc : constant Source_Ptr := Sloc (S);
6620 Op_Name : Entity_Id;
6622 FF : constant Entity_Id := First_Formal (S);
6623 NF : constant Entity_Id := Next_Formal (FF);
6626 -- Check that equality was properly defined, ignore call if not
6633 A : constant Entity_Id :=
6634 Make_Defining_Identifier (Sloc (FF),
6635 Chars => Chars (FF));
6637 B : constant Entity_Id :=
6638 Make_Defining_Identifier (Sloc (NF),
6639 Chars => Chars (NF));
6642 Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne);
6644 Formals := New_List (
6645 Make_Parameter_Specification (Loc,
6646 Defining_Identifier => A,
6648 New_Reference_To (Etype (First_Formal (S)),
6649 Sloc (Etype (First_Formal (S))))),
6651 Make_Parameter_Specification (Loc,
6652 Defining_Identifier => B,
6654 New_Reference_To (Etype (Next_Formal (First_Formal (S))),
6655 Sloc (Etype (Next_Formal (First_Formal (S)))))));
6658 Make_Subprogram_Declaration (Loc,
6660 Make_Function_Specification (Loc,
6661 Defining_Unit_Name => Op_Name,
6662 Parameter_Specifications => Formals,
6663 Result_Definition =>
6664 New_Reference_To (Standard_Boolean, Loc)));
6666 -- Insert inequality right after equality if it is explicit or after
6667 -- the derived type when implicit. These entities are created only
6668 -- for visibility purposes, and eventually replaced in the course of
6669 -- expansion, so they do not need to be attached to the tree and seen
6670 -- by the back-end. Keeping them internal also avoids spurious
6671 -- freezing problems. The declaration is inserted in the tree for
6672 -- analysis, and removed afterwards. If the equality operator comes
6673 -- from an explicit declaration, attach the inequality immediately
6674 -- after. Else the equality is inherited from a derived type
6675 -- declaration, so insert inequality after that declaration.
6677 if No (Alias (S)) then
6678 Insert_After (Unit_Declaration_Node (S), Decl);
6679 elsif Is_List_Member (Parent (S)) then
6680 Insert_After (Parent (S), Decl);
6682 Insert_After (Parent (Etype (First_Formal (S))), Decl);
6685 Mark_Rewrite_Insertion (Decl);
6686 Set_Is_Intrinsic_Subprogram (Op_Name);
6689 Set_Has_Completion (Op_Name);
6690 Set_Corresponding_Equality (Op_Name, S);
6691 Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S));
6693 end Make_Inequality_Operator;
6695 ----------------------
6696 -- May_Need_Actuals --
6697 ----------------------
6699 procedure May_Need_Actuals (Fun : Entity_Id) is
6704 F := First_Formal (Fun);
6706 while Present (F) loop
6707 if No (Default_Value (F)) then
6715 Set_Needs_No_Actuals (Fun, B);
6716 end May_Need_Actuals;
6718 ---------------------
6719 -- Mode_Conformant --
6720 ---------------------
6722 function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is
6725 Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result);
6727 end Mode_Conformant;
6729 ---------------------------
6730 -- New_Overloaded_Entity --
6731 ---------------------------
6733 procedure New_Overloaded_Entity
6735 Derived_Type : Entity_Id := Empty)
6737 Overridden_Subp : Entity_Id := Empty;
6738 -- Set if the current scope has an operation that is type-conformant
6739 -- with S, and becomes hidden by S.
6741 Is_Primitive_Subp : Boolean;
6742 -- Set to True if the new subprogram is primitive
6745 -- Entity that S overrides
6747 Prev_Vis : Entity_Id := Empty;
6748 -- Predecessor of E in Homonym chain
6750 procedure Check_For_Primitive_Subprogram
6751 (Is_Primitive : out Boolean;
6752 Is_Overriding : Boolean := False);
6753 -- If the subprogram being analyzed is a primitive operation of the type
6754 -- of a formal or result, set the Has_Primitive_Operations flag on the
6755 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6756 -- corresponding flag on the entity itself for later use.
6758 procedure Check_Synchronized_Overriding
6759 (Def_Id : Entity_Id;
6760 Overridden_Subp : out Entity_Id);
6761 -- First determine if Def_Id is an entry or a subprogram either defined
6762 -- in the scope of a task or protected type, or is a primitive of such
6763 -- a type. Check whether Def_Id overrides a subprogram of an interface
6764 -- implemented by the synchronized type, return the overridden entity
6767 function Is_Private_Declaration (E : Entity_Id) return Boolean;
6768 -- Check that E is declared in the private part of the current package,
6769 -- or in the package body, where it may hide a previous declaration.
6770 -- We can't use In_Private_Part by itself because this flag is also
6771 -- set when freezing entities, so we must examine the place of the
6772 -- declaration in the tree, and recognize wrapper packages as well.
6774 function Is_Overriding_Alias
6776 New_E : Entity_Id) return Boolean;
6777 -- Check whether new subprogram and old subprogram are both inherited
6778 -- from subprograms that have distinct dispatch table entries. This can
6779 -- occur with derivations from instances with accidental homonyms.
6780 -- The function is conservative given that the converse is only true
6781 -- within instances that contain accidental overloadings.
6783 ------------------------------------
6784 -- Check_For_Primitive_Subprogram --
6785 ------------------------------------
6787 procedure Check_For_Primitive_Subprogram
6788 (Is_Primitive : out Boolean;
6789 Is_Overriding : Boolean := False)
6795 function Visible_Part_Type (T : Entity_Id) return Boolean;
6796 -- Returns true if T is declared in the visible part of the current
6797 -- package scope; otherwise returns false. Assumes that T is declared
6800 procedure Check_Private_Overriding (T : Entity_Id);
6801 -- Checks that if a primitive abstract subprogram of a visible
6802 -- abstract type is declared in a private part, then it must override
6803 -- an abstract subprogram declared in the visible part. Also checks
6804 -- that if a primitive function with a controlling result is declared
6805 -- in a private part, then it must override a function declared in
6806 -- the visible part.
6808 ------------------------------
6809 -- Check_Private_Overriding --
6810 ------------------------------
6812 procedure Check_Private_Overriding (T : Entity_Id) is
6814 if Is_Package_Or_Generic_Package (Current_Scope)
6815 and then In_Private_Part (Current_Scope)
6816 and then Visible_Part_Type (T)
6817 and then not In_Instance
6819 if Is_Abstract_Type (T)
6820 and then Is_Abstract_Subprogram (S)
6821 and then (not Is_Overriding
6822 or else not Is_Abstract_Subprogram (E))
6824 Error_Msg_N ("abstract subprograms must be visible "
6825 & "(RM 3.9.3(10))!", S);
6827 elsif Ekind (S) = E_Function
6828 and then Is_Tagged_Type (T)
6829 and then T = Base_Type (Etype (S))
6830 and then not Is_Overriding
6833 ("private function with tagged result must"
6834 & " override visible-part function", S);
6836 ("\move subprogram to the visible part"
6837 & " (RM 3.9.3(10))", S);
6840 end Check_Private_Overriding;
6842 -----------------------
6843 -- Visible_Part_Type --
6844 -----------------------
6846 function Visible_Part_Type (T : Entity_Id) return Boolean is
6847 P : constant Node_Id := Unit_Declaration_Node (Scope (T));
6851 -- If the entity is a private type, then it must be declared in a
6854 if Ekind (T) in Private_Kind then
6858 -- Otherwise, we traverse the visible part looking for its
6859 -- corresponding declaration. We cannot use the declaration
6860 -- node directly because in the private part the entity of a
6861 -- private type is the one in the full view, which does not
6862 -- indicate that it is the completion of something visible.
6864 N := First (Visible_Declarations (Specification (P)));
6865 while Present (N) loop
6866 if Nkind (N) = N_Full_Type_Declaration
6867 and then Present (Defining_Identifier (N))
6868 and then T = Defining_Identifier (N)
6872 elsif Nkind_In (N, N_Private_Type_Declaration,
6873 N_Private_Extension_Declaration)
6874 and then Present (Defining_Identifier (N))
6875 and then T = Full_View (Defining_Identifier (N))
6884 end Visible_Part_Type;
6886 -- Start of processing for Check_For_Primitive_Subprogram
6889 Is_Primitive := False;
6891 if not Comes_From_Source (S) then
6894 -- If subprogram is at library level, it is not primitive operation
6896 elsif Current_Scope = Standard_Standard then
6899 elsif (Is_Package_Or_Generic_Package (Current_Scope)
6900 and then not In_Package_Body (Current_Scope))
6901 or else Is_Overriding
6903 -- For function, check return type
6905 if Ekind (S) = E_Function then
6906 if Ekind (Etype (S)) = E_Anonymous_Access_Type then
6907 F_Typ := Designated_Type (Etype (S));
6912 B_Typ := Base_Type (F_Typ);
6914 if Scope (B_Typ) = Current_Scope
6915 and then not Is_Class_Wide_Type (B_Typ)
6916 and then not Is_Generic_Type (B_Typ)
6918 Is_Primitive := True;
6919 Set_Has_Primitive_Operations (B_Typ);
6920 Set_Is_Primitive (S);
6921 Check_Private_Overriding (B_Typ);
6925 -- For all subprograms, check formals
6927 Formal := First_Formal (S);
6928 while Present (Formal) loop
6929 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then
6930 F_Typ := Designated_Type (Etype (Formal));
6932 F_Typ := Etype (Formal);
6935 B_Typ := Base_Type (F_Typ);
6937 if Ekind (B_Typ) = E_Access_Subtype then
6938 B_Typ := Base_Type (B_Typ);
6941 if Scope (B_Typ) = Current_Scope
6942 and then not Is_Class_Wide_Type (B_Typ)
6943 and then not Is_Generic_Type (B_Typ)
6945 Is_Primitive := True;
6946 Set_Is_Primitive (S);
6947 Set_Has_Primitive_Operations (B_Typ);
6948 Check_Private_Overriding (B_Typ);
6951 Next_Formal (Formal);
6954 end Check_For_Primitive_Subprogram;
6956 -----------------------------------
6957 -- Check_Synchronized_Overriding --
6958 -----------------------------------
6960 procedure Check_Synchronized_Overriding
6961 (Def_Id : Entity_Id;
6962 Overridden_Subp : out Entity_Id)
6964 Ifaces_List : Elist_Id;
6968 function Matches_Prefixed_View_Profile
6969 (Prim_Params : List_Id;
6970 Iface_Params : List_Id) return Boolean;
6971 -- Determine whether a subprogram's parameter profile Prim_Params
6972 -- matches that of a potentially overridden interface subprogram
6973 -- Iface_Params. Also determine if the type of first parameter of
6974 -- Iface_Params is an implemented interface.
6976 -----------------------------------
6977 -- Matches_Prefixed_View_Profile --
6978 -----------------------------------
6980 function Matches_Prefixed_View_Profile
6981 (Prim_Params : List_Id;
6982 Iface_Params : List_Id) return Boolean
6984 Iface_Id : Entity_Id;
6985 Iface_Param : Node_Id;
6986 Iface_Typ : Entity_Id;
6987 Prim_Id : Entity_Id;
6988 Prim_Param : Node_Id;
6989 Prim_Typ : Entity_Id;
6991 function Is_Implemented
6992 (Ifaces_List : Elist_Id;
6993 Iface : Entity_Id) return Boolean;
6994 -- Determine if Iface is implemented by the current task or
6997 --------------------
6998 -- Is_Implemented --
6999 --------------------
7001 function Is_Implemented
7002 (Ifaces_List : Elist_Id;
7003 Iface : Entity_Id) return Boolean
7005 Iface_Elmt : Elmt_Id;
7008 Iface_Elmt := First_Elmt (Ifaces_List);
7009 while Present (Iface_Elmt) loop
7010 if Node (Iface_Elmt) = Iface then
7014 Next_Elmt (Iface_Elmt);
7020 -- Start of processing for Matches_Prefixed_View_Profile
7023 Iface_Param := First (Iface_Params);
7024 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
7026 if Is_Access_Type (Iface_Typ) then
7027 Iface_Typ := Designated_Type (Iface_Typ);
7030 Prim_Param := First (Prim_Params);
7032 -- The first parameter of the potentially overridden subprogram
7033 -- must be an interface implemented by Prim.
7035 if not Is_Interface (Iface_Typ)
7036 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7041 -- The checks on the object parameters are done, move onto the
7042 -- rest of the parameters.
7044 if not In_Scope then
7045 Prim_Param := Next (Prim_Param);
7048 Iface_Param := Next (Iface_Param);
7049 while Present (Iface_Param) and then Present (Prim_Param) loop
7050 Iface_Id := Defining_Identifier (Iface_Param);
7051 Iface_Typ := Find_Parameter_Type (Iface_Param);
7053 Prim_Id := Defining_Identifier (Prim_Param);
7054 Prim_Typ := Find_Parameter_Type (Prim_Param);
7056 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7057 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7058 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7060 Iface_Typ := Designated_Type (Iface_Typ);
7061 Prim_Typ := Designated_Type (Prim_Typ);
7064 -- Case of multiple interface types inside a parameter profile
7066 -- (Obj_Param : in out Iface; ...; Param : Iface)
7068 -- If the interface type is implemented, then the matching type
7069 -- in the primitive should be the implementing record type.
7071 if Ekind (Iface_Typ) = E_Record_Type
7072 and then Is_Interface (Iface_Typ)
7073 and then Is_Implemented (Ifaces_List, Iface_Typ)
7075 if Prim_Typ /= Typ then
7079 -- The two parameters must be both mode and subtype conformant
7081 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7083 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7092 -- One of the two lists contains more parameters than the other
7094 if Present (Iface_Param) or else Present (Prim_Param) then
7099 end Matches_Prefixed_View_Profile;
7101 -- Start of processing for Check_Synchronized_Overriding
7104 Overridden_Subp := Empty;
7106 -- Def_Id must be an entry or a subprogram. We should skip predefined
7107 -- primitives internally generated by the frontend; however at this
7108 -- stage predefined primitives are still not fully decorated. As a
7109 -- minor optimization we skip here internally generated subprograms.
7111 if (Ekind (Def_Id) /= E_Entry
7112 and then Ekind (Def_Id) /= E_Function
7113 and then Ekind (Def_Id) /= E_Procedure)
7114 or else not Comes_From_Source (Def_Id)
7119 -- Search for the concurrent declaration since it contains the list
7120 -- of all implemented interfaces. In this case, the subprogram is
7121 -- declared within the scope of a protected or a task type.
7123 if Present (Scope (Def_Id))
7124 and then Is_Concurrent_Type (Scope (Def_Id))
7125 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7127 Typ := Scope (Def_Id);
7130 -- The enclosing scope is not a synchronized type and the subprogram
7133 elsif No (First_Formal (Def_Id)) then
7136 -- The subprogram has formals and hence it may be a primitive of a
7140 Typ := Etype (First_Formal (Def_Id));
7142 if Is_Access_Type (Typ) then
7143 Typ := Directly_Designated_Type (Typ);
7146 if Is_Concurrent_Type (Typ)
7147 and then not Is_Generic_Actual_Type (Typ)
7151 -- This case occurs when the concurrent type is declared within
7152 -- a generic unit. As a result the corresponding record has been
7153 -- built and used as the type of the first formal, we just have
7154 -- to retrieve the corresponding concurrent type.
7156 elsif Is_Concurrent_Record_Type (Typ)
7157 and then Present (Corresponding_Concurrent_Type (Typ))
7159 Typ := Corresponding_Concurrent_Type (Typ);
7167 -- There is no overriding to check if is an inherited operation in a
7168 -- type derivation on for a generic actual.
7170 Collect_Interfaces (Typ, Ifaces_List);
7172 if Is_Empty_Elmt_List (Ifaces_List) then
7176 -- Determine whether entry or subprogram Def_Id overrides a primitive
7177 -- operation that belongs to one of the interfaces in Ifaces_List.
7180 Candidate : Entity_Id := Empty;
7181 Hom : Entity_Id := Empty;
7182 Iface_Typ : Entity_Id;
7183 Subp : Entity_Id := Empty;
7186 -- Traverse the homonym chain, looking at a potentially
7187 -- overridden subprogram that belongs to an implemented
7190 Hom := Current_Entity_In_Scope (Def_Id);
7191 while Present (Hom) loop
7195 or else not Is_Overloadable (Subp)
7196 or else not Is_Primitive (Subp)
7197 or else not Is_Dispatching_Operation (Subp)
7198 or else not Present (Find_Dispatching_Type (Subp))
7199 or else not Is_Interface (Find_Dispatching_Type (Subp))
7203 -- Entries and procedures can override abstract or null
7204 -- interface procedures
7206 elsif (Ekind (Def_Id) = E_Procedure
7207 or else Ekind (Def_Id) = E_Entry)
7208 and then Ekind (Subp) = E_Procedure
7209 and then Matches_Prefixed_View_Profile
7210 (Parameter_Specifications (Parent (Def_Id)),
7211 Parameter_Specifications (Parent (Subp)))
7215 -- For an overridden subprogram Subp, check whether the mode
7216 -- of its first parameter is correct depending on the kind
7217 -- of synchronized type.
7220 Formal : constant Node_Id := First_Formal (Candidate);
7223 -- In order for an entry or a protected procedure to
7224 -- override, the first parameter of the overridden
7225 -- routine must be of mode "out", "in out" or
7226 -- access-to-variable.
7228 if (Ekind (Candidate) = E_Entry
7229 or else Ekind (Candidate) = E_Procedure)
7230 and then Is_Protected_Type (Typ)
7231 and then Ekind (Formal) /= E_In_Out_Parameter
7232 and then Ekind (Formal) /= E_Out_Parameter
7233 and then Nkind (Parameter_Type (Parent (Formal)))
7234 /= N_Access_Definition
7238 -- All other cases are OK since a task entry or routine
7239 -- does not have a restriction on the mode of the first
7240 -- parameter of the overridden interface routine.
7243 Overridden_Subp := Candidate;
7248 -- Functions can override abstract interface functions
7250 elsif Ekind (Def_Id) = E_Function
7251 and then Ekind (Subp) = E_Function
7252 and then Matches_Prefixed_View_Profile
7253 (Parameter_Specifications (Parent (Def_Id)),
7254 Parameter_Specifications (Parent (Subp)))
7255 and then Etype (Result_Definition (Parent (Def_Id))) =
7256 Etype (Result_Definition (Parent (Subp)))
7258 Overridden_Subp := Subp;
7262 Hom := Homonym (Hom);
7265 -- After examining all candidates for overriding, we are
7266 -- left with the best match which is a mode incompatible
7267 -- interface routine. Do not emit an error if the Expander
7268 -- is active since this error will be detected later on
7269 -- after all concurrent types are expanded and all wrappers
7270 -- are built. This check is meant for spec-only
7273 if Present (Candidate)
7274 and then not Expander_Active
7277 Find_Parameter_Type (Parent (First_Formal (Candidate)));
7279 -- Def_Id is primitive of a protected type, declared
7280 -- inside the type, and the candidate is primitive of a
7281 -- limited or synchronized interface.
7284 and then Is_Protected_Type (Typ)
7286 (Is_Limited_Interface (Iface_Typ)
7287 or else Is_Protected_Interface (Iface_Typ)
7288 or else Is_Synchronized_Interface (Iface_Typ)
7289 or else Is_Task_Interface (Iface_Typ))
7291 -- Must reword this message, comma before to in -gnatj
7295 ("first formal of & must be of mode `OUT`, `IN OUT`"
7296 & " or access-to-variable", Typ, Candidate);
7298 ("\to be overridden by protected procedure or entry "
7299 & "(RM 9.4(11.9/2))", Typ);
7303 Overridden_Subp := Candidate;
7306 end Check_Synchronized_Overriding;
7308 ----------------------------
7309 -- Is_Private_Declaration --
7310 ----------------------------
7312 function Is_Private_Declaration (E : Entity_Id) return Boolean is
7313 Priv_Decls : List_Id;
7314 Decl : constant Node_Id := Unit_Declaration_Node (E);
7317 if Is_Package_Or_Generic_Package (Current_Scope)
7318 and then In_Private_Part (Current_Scope)
7321 Private_Declarations (
7322 Specification (Unit_Declaration_Node (Current_Scope)));
7324 return In_Package_Body (Current_Scope)
7326 (Is_List_Member (Decl)
7327 and then List_Containing (Decl) = Priv_Decls)
7328 or else (Nkind (Parent (Decl)) = N_Package_Specification
7331 (Defining_Entity (Parent (Decl)))
7332 and then List_Containing (Parent (Parent (Decl)))
7337 end Is_Private_Declaration;
7339 --------------------------
7340 -- Is_Overriding_Alias --
7341 --------------------------
7343 function Is_Overriding_Alias
7345 New_E : Entity_Id) return Boolean
7347 AO : constant Entity_Id := Alias (Old_E);
7348 AN : constant Entity_Id := Alias (New_E);
7351 return Scope (AO) /= Scope (AN)
7352 or else No (DTC_Entity (AO))
7353 or else No (DTC_Entity (AN))
7354 or else DT_Position (AO) = DT_Position (AN);
7355 end Is_Overriding_Alias;
7357 -- Start of processing for New_Overloaded_Entity
7360 -- We need to look for an entity that S may override. This must be a
7361 -- homonym in the current scope, so we look for the first homonym of
7362 -- S in the current scope as the starting point for the search.
7364 E := Current_Entity_In_Scope (S);
7366 -- If there is no homonym then this is definitely not overriding
7369 Enter_Overloaded_Entity (S);
7370 Check_Dispatching_Operation (S, Empty);
7371 Check_For_Primitive_Subprogram (Is_Primitive_Subp);
7373 -- If subprogram has an explicit declaration, check whether it
7374 -- has an overriding indicator.
7376 if Comes_From_Source (S) then
7377 Check_Synchronized_Overriding (S, Overridden_Subp);
7378 Check_Overriding_Indicator
7379 (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp);
7382 -- If there is a homonym that is not overloadable, then we have an
7383 -- error, except for the special cases checked explicitly below.
7385 elsif not Is_Overloadable (E) then
7387 -- Check for spurious conflict produced by a subprogram that has the
7388 -- same name as that of the enclosing generic package. The conflict
7389 -- occurs within an instance, between the subprogram and the renaming
7390 -- declaration for the package. After the subprogram, the package
7391 -- renaming declaration becomes hidden.
7393 if Ekind (E) = E_Package
7394 and then Present (Renamed_Object (E))
7395 and then Renamed_Object (E) = Current_Scope
7396 and then Nkind (Parent (Renamed_Object (E))) =
7397 N_Package_Specification
7398 and then Present (Generic_Parent (Parent (Renamed_Object (E))))
7401 Set_Is_Immediately_Visible (E, False);
7402 Enter_Overloaded_Entity (S);
7403 Set_Homonym (S, Homonym (E));
7404 Check_Dispatching_Operation (S, Empty);
7405 Check_Overriding_Indicator (S, Empty, Is_Primitive => False);
7407 -- If the subprogram is implicit it is hidden by the previous
7408 -- declaration. However if it is dispatching, it must appear in the
7409 -- dispatch table anyway, because it can be dispatched to even if it
7410 -- cannot be called directly.
7412 elsif Present (Alias (S))
7413 and then not Comes_From_Source (S)
7415 Set_Scope (S, Current_Scope);
7417 if Is_Dispatching_Operation (Alias (S)) then
7418 Check_Dispatching_Operation (S, Empty);
7424 Error_Msg_Sloc := Sloc (E);
7426 -- Generate message, with useful additional warning if in generic
7428 if Is_Generic_Unit (E) then
7429 Error_Msg_N ("previous generic unit cannot be overloaded", S);
7430 Error_Msg_N ("\& conflicts with declaration#", S);
7432 Error_Msg_N ("& conflicts with declaration#", S);
7438 -- E exists and is overloadable
7441 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
7442 -- need no check against the homonym chain. They are directly added
7443 -- to the list of primitive operations of Derived_Type.
7445 if Ada_Version >= Ada_05
7446 and then Present (Derived_Type)
7447 and then Is_Dispatching_Operation (Alias (S))
7448 and then Present (Find_Dispatching_Type (Alias (S)))
7449 and then Is_Interface (Find_Dispatching_Type (Alias (S)))
7451 goto Add_New_Entity;
7454 Check_Synchronized_Overriding (S, Overridden_Subp);
7456 -- Loop through E and its homonyms to determine if any of them is
7457 -- the candidate for overriding by S.
7459 while Present (E) loop
7461 -- Definitely not interesting if not in the current scope
7463 if Scope (E) /= Current_Scope then
7466 -- Check if we have type conformance
7468 elsif Type_Conformant (E, S) then
7470 -- If the old and new entities have the same profile and one
7471 -- is not the body of the other, then this is an error, unless
7472 -- one of them is implicitly declared.
7474 -- There are some cases when both can be implicit, for example
7475 -- when both a literal and a function that overrides it are
7476 -- inherited in a derivation, or when an inherited operation
7477 -- of a tagged full type overrides the inherited operation of
7478 -- a private extension. Ada 83 had a special rule for the
7479 -- literal case. In Ada95, the later implicit operation hides
7480 -- the former, and the literal is always the former. In the
7481 -- odd case where both are derived operations declared at the
7482 -- same point, both operations should be declared, and in that
7483 -- case we bypass the following test and proceed to the next
7484 -- part. This can only occur for certain obscure cases in
7485 -- instances, when an operation on a type derived from a formal
7486 -- private type does not override a homograph inherited from
7487 -- the actual. In subsequent derivations of such a type, the
7488 -- DT positions of these operations remain distinct, if they
7491 if Present (Alias (S))
7492 and then (No (Alias (E))
7493 or else Comes_From_Source (E)
7494 or else Is_Abstract_Subprogram (S)
7496 (Is_Dispatching_Operation (E)
7497 and then Is_Overriding_Alias (E, S)))
7498 and then Ekind (E) /= E_Enumeration_Literal
7500 -- When an derived operation is overloaded it may be due to
7501 -- the fact that the full view of a private extension
7502 -- re-inherits. It has to be dealt with.
7504 if Is_Package_Or_Generic_Package (Current_Scope)
7505 and then In_Private_Part (Current_Scope)
7507 Check_Operation_From_Private_View (S, E);
7510 -- In any case the implicit operation remains hidden by
7511 -- the existing declaration, which is overriding.
7513 Set_Is_Overriding_Operation (E);
7515 if Comes_From_Source (E) then
7516 Check_Overriding_Indicator (E, S, Is_Primitive => False);
7518 -- Indicate that E overrides the operation from which
7521 if Present (Alias (S)) then
7522 Set_Overridden_Operation (E, Alias (S));
7524 Set_Overridden_Operation (E, S);
7530 -- Within an instance, the renaming declarations for actual
7531 -- subprograms may become ambiguous, but they do not hide each
7534 elsif Ekind (E) /= E_Entry
7535 and then not Comes_From_Source (E)
7536 and then not Is_Generic_Instance (E)
7537 and then (Present (Alias (E))
7538 or else Is_Intrinsic_Subprogram (E))
7539 and then (not In_Instance
7540 or else No (Parent (E))
7541 or else Nkind (Unit_Declaration_Node (E)) /=
7542 N_Subprogram_Renaming_Declaration)
7544 -- A subprogram child unit is not allowed to override an
7545 -- inherited subprogram (10.1.1(20)).
7547 if Is_Child_Unit (S) then
7549 ("child unit overrides inherited subprogram in parent",
7554 if Is_Non_Overriding_Operation (E, S) then
7555 Enter_Overloaded_Entity (S);
7557 if No (Derived_Type)
7558 or else Is_Tagged_Type (Derived_Type)
7560 Check_Dispatching_Operation (S, Empty);
7566 -- E is a derived operation or an internal operator which
7567 -- is being overridden. Remove E from further visibility.
7568 -- Furthermore, if E is a dispatching operation, it must be
7569 -- replaced in the list of primitive operations of its type
7570 -- (see Override_Dispatching_Operation).
7572 Overridden_Subp := E;
7578 Prev := First_Entity (Current_Scope);
7579 while Present (Prev)
7580 and then Next_Entity (Prev) /= E
7585 -- It is possible for E to be in the current scope and
7586 -- yet not in the entity chain. This can only occur in a
7587 -- generic context where E is an implicit concatenation
7588 -- in the formal part, because in a generic body the
7589 -- entity chain starts with the formals.
7592 (Present (Prev) or else Chars (E) = Name_Op_Concat);
7594 -- E must be removed both from the entity_list of the
7595 -- current scope, and from the visibility chain
7597 if Debug_Flag_E then
7598 Write_Str ("Override implicit operation ");
7599 Write_Int (Int (E));
7603 -- If E is a predefined concatenation, it stands for four
7604 -- different operations. As a result, a single explicit
7605 -- declaration does not hide it. In a possible ambiguous
7606 -- situation, Disambiguate chooses the user-defined op,
7607 -- so it is correct to retain the previous internal one.
7609 if Chars (E) /= Name_Op_Concat
7610 or else Ekind (E) /= E_Operator
7612 -- For nondispatching derived operations that are
7613 -- overridden by a subprogram declared in the private
7614 -- part of a package, we retain the derived subprogram
7615 -- but mark it as not immediately visible. If the
7616 -- derived operation was declared in the visible part
7617 -- then this ensures that it will still be visible
7618 -- outside the package with the proper signature
7619 -- (calls from outside must also be directed to this
7620 -- version rather than the overriding one, unlike the
7621 -- dispatching case). Calls from inside the package
7622 -- will still resolve to the overriding subprogram
7623 -- since the derived one is marked as not visible
7624 -- within the package.
7626 -- If the private operation is dispatching, we achieve
7627 -- the overriding by keeping the implicit operation
7628 -- but setting its alias to be the overriding one. In
7629 -- this fashion the proper body is executed in all
7630 -- cases, but the original signature is used outside
7633 -- If the overriding is not in the private part, we
7634 -- remove the implicit operation altogether.
7636 if Is_Private_Declaration (S) then
7637 if not Is_Dispatching_Operation (E) then
7638 Set_Is_Immediately_Visible (E, False);
7640 -- Work done in Override_Dispatching_Operation,
7641 -- so nothing else need to be done here.
7647 -- Find predecessor of E in Homonym chain
7649 if E = Current_Entity (E) then
7652 Prev_Vis := Current_Entity (E);
7653 while Homonym (Prev_Vis) /= E loop
7654 Prev_Vis := Homonym (Prev_Vis);
7658 if Prev_Vis /= Empty then
7660 -- Skip E in the visibility chain
7662 Set_Homonym (Prev_Vis, Homonym (E));
7665 Set_Name_Entity_Id (Chars (E), Homonym (E));
7668 Set_Next_Entity (Prev, Next_Entity (E));
7670 if No (Next_Entity (Prev)) then
7671 Set_Last_Entity (Current_Scope, Prev);
7677 Enter_Overloaded_Entity (S);
7678 Set_Is_Overriding_Operation (S);
7679 Check_Overriding_Indicator (S, E, Is_Primitive => True);
7681 -- Indicate that S overrides the operation from which
7684 if Comes_From_Source (S) then
7685 if Present (Alias (E)) then
7686 Set_Overridden_Operation (S, Alias (E));
7688 Set_Overridden_Operation (S, E);
7692 if Is_Dispatching_Operation (E) then
7694 -- An overriding dispatching subprogram inherits the
7695 -- convention of the overridden subprogram (by
7698 Set_Convention (S, Convention (E));
7699 Check_Dispatching_Operation (S, E);
7702 Check_Dispatching_Operation (S, Empty);
7705 Check_For_Primitive_Subprogram
7706 (Is_Primitive_Subp, Is_Overriding => True);
7707 goto Check_Inequality;
7710 -- Apparent redeclarations in instances can occur when two
7711 -- formal types get the same actual type. The subprograms in
7712 -- in the instance are legal, even if not callable from the
7713 -- outside. Calls from within are disambiguated elsewhere.
7714 -- For dispatching operations in the visible part, the usual
7715 -- rules apply, and operations with the same profile are not
7718 elsif (In_Instance_Visible_Part
7719 and then not Is_Dispatching_Operation (E))
7720 or else In_Instance_Not_Visible
7724 -- Here we have a real error (identical profile)
7727 Error_Msg_Sloc := Sloc (E);
7729 -- Avoid cascaded errors if the entity appears in
7730 -- subsequent calls.
7732 Set_Scope (S, Current_Scope);
7734 -- Generate error, with extra useful warning for the case
7735 -- of a generic instance with no completion.
7737 if Is_Generic_Instance (S)
7738 and then not Has_Completion (E)
7741 ("instantiation cannot provide body for&", S);
7742 Error_Msg_N ("\& conflicts with declaration#", S);
7744 Error_Msg_N ("& conflicts with declaration#", S);
7751 -- If one subprogram has an access parameter and the other
7752 -- a parameter of an access type, calls to either might be
7753 -- ambiguous. Verify that parameters match except for the
7754 -- access parameter.
7756 if May_Hide_Profile then
7762 F1 := First_Formal (S);
7763 F2 := First_Formal (E);
7764 while Present (F1) and then Present (F2) loop
7765 if Is_Access_Type (Etype (F1)) then
7766 if not Is_Access_Type (Etype (F2))
7767 or else not Conforming_Types
7768 (Designated_Type (Etype (F1)),
7769 Designated_Type (Etype (F2)),
7772 May_Hide_Profile := False;
7776 not Conforming_Types
7777 (Etype (F1), Etype (F2), Type_Conformant)
7779 May_Hide_Profile := False;
7790 Error_Msg_NE ("calls to& may be ambiguous?", S, S);
7801 -- On exit, we know that S is a new entity
7803 Enter_Overloaded_Entity (S);
7804 Check_For_Primitive_Subprogram (Is_Primitive_Subp);
7805 Check_Overriding_Indicator
7806 (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp);
7808 -- If S is a derived operation for an untagged type then by
7809 -- definition it's not a dispatching operation (even if the parent
7810 -- operation was dispatching), so we don't call
7811 -- Check_Dispatching_Operation in that case.
7813 if No (Derived_Type)
7814 or else Is_Tagged_Type (Derived_Type)
7816 Check_Dispatching_Operation (S, Empty);
7820 -- If this is a user-defined equality operator that is not a derived
7821 -- subprogram, create the corresponding inequality. If the operation is
7822 -- dispatching, the expansion is done elsewhere, and we do not create
7823 -- an explicit inequality operation.
7825 <<Check_Inequality>>
7826 if Chars (S) = Name_Op_Eq
7827 and then Etype (S) = Standard_Boolean
7828 and then Present (Parent (S))
7829 and then not Is_Dispatching_Operation (S)
7831 Make_Inequality_Operator (S);
7833 end New_Overloaded_Entity;
7835 ---------------------
7836 -- Process_Formals --
7837 ---------------------
7839 procedure Process_Formals
7841 Related_Nod : Node_Id)
7843 Param_Spec : Node_Id;
7845 Formal_Type : Entity_Id;
7849 Num_Out_Params : Nat := 0;
7850 First_Out_Param : Entity_Id := Empty;
7851 -- Used for setting Is_Only_Out_Parameter
7853 function Designates_From_With_Type (Typ : Entity_Id) return Boolean;
7854 -- Determine whether an access type designates a type coming from a
7857 function Is_Class_Wide_Default (D : Node_Id) return Boolean;
7858 -- Check whether the default has a class-wide type. After analysis the
7859 -- default has the type of the formal, so we must also check explicitly
7860 -- for an access attribute.
7862 -------------------------------
7863 -- Designates_From_With_Type --
7864 -------------------------------
7866 function Designates_From_With_Type (Typ : Entity_Id) return Boolean is
7867 Desig : Entity_Id := Typ;
7870 if Is_Access_Type (Desig) then
7871 Desig := Directly_Designated_Type (Desig);
7874 if Is_Class_Wide_Type (Desig) then
7875 Desig := Root_Type (Desig);
7879 Ekind (Desig) = E_Incomplete_Type
7880 and then From_With_Type (Desig);
7881 end Designates_From_With_Type;
7883 ---------------------------
7884 -- Is_Class_Wide_Default --
7885 ---------------------------
7887 function Is_Class_Wide_Default (D : Node_Id) return Boolean is
7889 return Is_Class_Wide_Type (Designated_Type (Etype (D)))
7890 or else (Nkind (D) = N_Attribute_Reference
7891 and then Attribute_Name (D) = Name_Access
7892 and then Is_Class_Wide_Type (Etype (Prefix (D))));
7893 end Is_Class_Wide_Default;
7895 -- Start of processing for Process_Formals
7898 -- In order to prevent premature use of the formals in the same formal
7899 -- part, the Ekind is left undefined until all default expressions are
7900 -- analyzed. The Ekind is established in a separate loop at the end.
7902 Param_Spec := First (T);
7903 while Present (Param_Spec) loop
7904 Formal := Defining_Identifier (Param_Spec);
7905 Set_Never_Set_In_Source (Formal, True);
7906 Enter_Name (Formal);
7908 -- Case of ordinary parameters
7910 if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then
7911 Find_Type (Parameter_Type (Param_Spec));
7912 Ptype := Parameter_Type (Param_Spec);
7914 if Ptype = Error then
7918 Formal_Type := Entity (Ptype);
7920 if Is_Incomplete_Type (Formal_Type)
7922 (Is_Class_Wide_Type (Formal_Type)
7923 and then Is_Incomplete_Type (Root_Type (Formal_Type)))
7925 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
7926 -- primitive operations, as long as their completion is
7927 -- in the same declarative part. If in the private part
7928 -- this means that the type cannot be a Taft-amendment type.
7929 -- Check is done on package exit. For access to subprograms,
7930 -- the use is legal for Taft-amendment types.
7932 if Is_Tagged_Type (Formal_Type) then
7933 if Ekind (Scope (Current_Scope)) = E_Package
7934 and then In_Private_Part (Scope (Current_Scope))
7935 and then not From_With_Type (Formal_Type)
7936 and then not Is_Class_Wide_Type (Formal_Type)
7939 (Parent (T), N_Access_Function_Definition,
7940 N_Access_Procedure_Definition)
7944 Private_Dependents (Base_Type (Formal_Type)));
7948 -- Special handling of Value_Type for CIL case
7950 elsif Is_Value_Type (Formal_Type) then
7953 elsif not Nkind_In (Parent (T), N_Access_Function_Definition,
7954 N_Access_Procedure_Definition)
7957 ("invalid use of incomplete type&",
7958 Param_Spec, Formal_Type);
7960 -- Further checks on the legality of incomplete types
7961 -- in formal parts must be delayed until the freeze point
7962 -- of the enclosing subprogram or access to subprogram.
7965 elsif Ekind (Formal_Type) = E_Void then
7966 Error_Msg_NE ("premature use of&",
7967 Parameter_Type (Param_Spec), Formal_Type);
7970 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7971 -- declaration corresponding to the null-excluding type of the
7972 -- formal in the enclosing scope. Finally, replace the parameter
7973 -- type of the formal with the internal subtype.
7975 if Ada_Version >= Ada_05
7976 and then Null_Exclusion_Present (Param_Spec)
7978 if not Is_Access_Type (Formal_Type) then
7980 ("`NOT NULL` allowed only for an access type", Param_Spec);
7983 if Can_Never_Be_Null (Formal_Type)
7984 and then Comes_From_Source (Related_Nod)
7987 ("`NOT NULL` not allowed (& already excludes null)",
7993 Create_Null_Excluding_Itype
7995 Related_Nod => Related_Nod,
7996 Scope_Id => Scope (Current_Scope));
7998 -- If the designated type of the itype is an itype we
7999 -- decorate it with the Has_Delayed_Freeze attribute to
8000 -- avoid problems with the backend.
8003 -- type T is access procedure;
8004 -- procedure Op (O : not null T);
8006 if Is_Itype (Directly_Designated_Type (Formal_Type)) then
8007 Set_Has_Delayed_Freeze (Formal_Type);
8012 -- An access formal type
8016 Access_Definition (Related_Nod, Parameter_Type (Param_Spec));
8018 -- No need to continue if we already notified errors
8020 if not Present (Formal_Type) then
8024 -- Ada 2005 (AI-254)
8027 AD : constant Node_Id :=
8028 Access_To_Subprogram_Definition
8029 (Parameter_Type (Param_Spec));
8031 if Present (AD) and then Protected_Present (AD) then
8033 Replace_Anonymous_Access_To_Protected_Subprogram
8039 Set_Etype (Formal, Formal_Type);
8040 Default := Expression (Param_Spec);
8042 if Present (Default) then
8043 if Out_Present (Param_Spec) then
8045 ("default initialization only allowed for IN parameters",
8049 -- Do the special preanalysis of the expression (see section on
8050 -- "Handling of Default Expressions" in the spec of package Sem).
8052 Preanalyze_Spec_Expression (Default, Formal_Type);
8054 -- An access to constant cannot be the default for
8055 -- an access parameter that is an access to variable.
8057 if Ekind (Formal_Type) = E_Anonymous_Access_Type
8058 and then not Is_Access_Constant (Formal_Type)
8059 and then Is_Access_Type (Etype (Default))
8060 and then Is_Access_Constant (Etype (Default))
8063 ("formal that is access to variable cannot be initialized " &
8064 "with an access-to-constant expression", Default);
8067 -- Check that the designated type of an access parameter's default
8068 -- is not a class-wide type unless the parameter's designated type
8069 -- is also class-wide.
8071 if Ekind (Formal_Type) = E_Anonymous_Access_Type
8072 and then not Designates_From_With_Type (Formal_Type)
8073 and then Is_Class_Wide_Default (Default)
8074 and then not Is_Class_Wide_Type (Designated_Type (Formal_Type))
8077 ("access to class-wide expression not allowed here", Default);
8080 -- Check incorrect use of dynamically tagged expressions
8082 if Is_Tagged_Type (Formal_Type) then
8083 Check_Dynamically_Tagged_Expression
8086 Related_Nod => Default);
8090 -- Ada 2005 (AI-231): Static checks
8092 if Ada_Version >= Ada_05
8093 and then Is_Access_Type (Etype (Formal))
8094 and then Can_Never_Be_Null (Etype (Formal))
8096 Null_Exclusion_Static_Checks (Param_Spec);
8103 -- If this is the formal part of a function specification, analyze the
8104 -- subtype mark in the context where the formals are visible but not
8105 -- yet usable, and may hide outer homographs.
8107 if Nkind (Related_Nod) = N_Function_Specification then
8108 Analyze_Return_Type (Related_Nod);
8111 -- Now set the kind (mode) of each formal
8113 Param_Spec := First (T);
8115 while Present (Param_Spec) loop
8116 Formal := Defining_Identifier (Param_Spec);
8117 Set_Formal_Mode (Formal);
8119 if Ekind (Formal) = E_In_Parameter then
8120 Set_Default_Value (Formal, Expression (Param_Spec));
8122 if Present (Expression (Param_Spec)) then
8123 Default := Expression (Param_Spec);
8125 if Is_Scalar_Type (Etype (Default)) then
8127 (Parameter_Type (Param_Spec)) /= N_Access_Definition
8129 Formal_Type := Entity (Parameter_Type (Param_Spec));
8132 Formal_Type := Access_Definition
8133 (Related_Nod, Parameter_Type (Param_Spec));
8136 Apply_Scalar_Range_Check (Default, Formal_Type);
8140 elsif Ekind (Formal) = E_Out_Parameter then
8141 Num_Out_Params := Num_Out_Params + 1;
8143 if Num_Out_Params = 1 then
8144 First_Out_Param := Formal;
8147 elsif Ekind (Formal) = E_In_Out_Parameter then
8148 Num_Out_Params := Num_Out_Params + 1;
8154 if Present (First_Out_Param) and then Num_Out_Params = 1 then
8155 Set_Is_Only_Out_Parameter (First_Out_Param);
8157 end Process_Formals;
8163 procedure Process_PPCs
8165 Spec_Id : Entity_Id;
8166 Body_Id : Entity_Id)
8168 Loc : constant Source_Ptr := Sloc (N);
8170 Plist : List_Id := No_List;
8174 function Grab_PPC (Nam : Name_Id) return Node_Id;
8175 -- Prag contains an analyzed precondition or postcondition pragma.
8176 -- This function copies the pragma, changes it to the corresponding
8177 -- Check pragma and returns the Check pragma as the result. The
8178 -- argument Nam is either Name_Precondition or Name_Postcondition.
8184 function Grab_PPC (Nam : Name_Id) return Node_Id is
8185 CP : constant Node_Id := New_Copy_Tree (Prag);
8188 -- Set Analyzed to false, since we want to reanalyze the check
8189 -- procedure. Note that it is only at the outer level that we
8190 -- do this fiddling, for the spec cases, the already preanalyzed
8191 -- parameters are not affected.
8193 -- For a postcondition pragma within a generic, preserve the pragma
8194 -- for later expansion.
8196 Set_Analyzed (CP, False);
8198 if Nam = Name_Postcondition
8199 and then not Expander_Active
8204 -- Change pragma into corresponding pragma Check
8206 Prepend_To (Pragma_Argument_Associations (CP),
8207 Make_Pragma_Argument_Association (Sloc (Prag),
8209 Make_Identifier (Loc,
8211 Set_Pragma_Identifier (CP,
8212 Make_Identifier (Sloc (Prag),
8213 Chars => Name_Check));
8218 -- Start of processing for Process_PPCs
8221 -- Nothing to do if we are not generating code
8223 if Operating_Mode /= Generate_Code then
8227 -- Grab preconditions from spec
8229 if Present (Spec_Id) then
8231 -- Loop through PPC pragmas from spec. Note that preconditions from
8232 -- the body will be analyzed and converted when we scan the body
8233 -- declarations below.
8235 Prag := Spec_PPC_List (Spec_Id);
8236 while Present (Prag) loop
8237 if Pragma_Name (Prag) = Name_Precondition
8238 and then PPC_Enabled (Prag)
8240 -- Add pragma Check at the start of the declarations of N.
8241 -- Note that this processing reverses the order of the list,
8242 -- which is what we want since new entries were chained to
8243 -- the head of the list.
8245 Prepend (Grab_PPC (Name_Precondition), Declarations (N));
8248 Prag := Next_Pragma (Prag);
8252 -- Build postconditions procedure if needed and prepend the following
8253 -- declaration to the start of the declarations for the subprogram.
8255 -- procedure _postconditions [(_Result : resulttype)] is
8257 -- pragma Check (Postcondition, condition [,message]);
8258 -- pragma Check (Postcondition, condition [,message]);
8262 -- First we deal with the postconditions in the body
8264 if Is_Non_Empty_List (Declarations (N)) then
8266 -- Loop through declarations
8268 Prag := First (Declarations (N));
8269 while Present (Prag) loop
8270 if Nkind (Prag) = N_Pragma then
8272 -- If pragma, capture if enabled postcondition, else ignore
8274 if Pragma_Name (Prag) = Name_Postcondition
8275 and then Check_Enabled (Name_Postcondition)
8277 if Plist = No_List then
8278 Plist := Empty_List;
8283 -- If expansion is disabled, as in a generic unit,
8284 -- save pragma for later expansion.
8286 if not Expander_Active then
8287 Prepend (Grab_PPC (Name_Postcondition), Declarations (N));
8289 Append (Grab_PPC (Name_Postcondition), Plist);
8295 -- Not a pragma, if comes from source, then end scan
8297 elsif Comes_From_Source (Prag) then
8300 -- Skip stuff not coming from source
8308 -- Now deal with any postconditions from the spec
8310 if Present (Spec_Id) then
8312 -- Loop through PPC pragmas from spec
8314 Prag := Spec_PPC_List (Spec_Id);
8315 while Present (Prag) loop
8316 if Pragma_Name (Prag) = Name_Postcondition
8317 and then PPC_Enabled (Prag)
8319 if Plist = No_List then
8320 Plist := Empty_List;
8323 if not Expander_Active then
8324 Prepend (Grab_PPC (Name_Postcondition), Declarations (N));
8326 Append (Grab_PPC (Name_Postcondition), Plist);
8330 Prag := Next_Pragma (Prag);
8334 -- If we had any postconditions and expansion is enabled, build
8335 -- the _Postconditions procedure.
8338 and then Expander_Active
8340 Subp := Defining_Entity (N);
8342 if Etype (Subp) /= Standard_Void_Type then
8344 Make_Parameter_Specification (Loc,
8345 Defining_Identifier =>
8346 Make_Defining_Identifier (Loc,
8347 Chars => Name_uResult),
8348 Parameter_Type => New_Occurrence_Of (Etype (Subp), Loc)));
8354 Post_Proc : constant Entity_Id :=
8355 Make_Defining_Identifier (Loc,
8356 Chars => Name_uPostconditions);
8357 -- The entity for the _Postconditions procedure
8359 Prepend_To (Declarations (N),
8360 Make_Subprogram_Body (Loc,
8362 Make_Procedure_Specification (Loc,
8363 Defining_Unit_Name => Post_Proc,
8364 Parameter_Specifications => Parms),
8366 Declarations => Empty_List,
8368 Handled_Statement_Sequence =>
8369 Make_Handled_Sequence_Of_Statements (Loc,
8370 Statements => Plist)));
8372 -- If this is a procedure, set the Postcondition_Proc attribute
8374 if Etype (Subp) = Standard_Void_Type then
8375 Set_Postcondition_Proc (Spec_Id, Post_Proc);
8379 if Present (Spec_Id) then
8380 Set_Has_Postconditions (Spec_Id);
8382 Set_Has_Postconditions (Body_Id);
8387 ----------------------------
8388 -- Reference_Body_Formals --
8389 ----------------------------
8391 procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is
8396 if Error_Posted (Spec) then
8400 -- Iterate over both lists. They may be of different lengths if the two
8401 -- specs are not conformant.
8403 Fs := First_Formal (Spec);
8404 Fb := First_Formal (Bod);
8405 while Present (Fs) and then Present (Fb) loop
8406 Generate_Reference (Fs, Fb, 'b');
8409 Style.Check_Identifier (Fb, Fs);
8412 Set_Spec_Entity (Fb, Fs);
8413 Set_Referenced (Fs, False);
8417 end Reference_Body_Formals;
8419 -------------------------
8420 -- Set_Actual_Subtypes --
8421 -------------------------
8423 procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is
8424 Loc : constant Source_Ptr := Sloc (N);
8428 First_Stmt : Node_Id := Empty;
8429 AS_Needed : Boolean;
8432 -- If this is an empty initialization procedure, no need to create
8433 -- actual subtypes (small optimization).
8435 if Ekind (Subp) = E_Procedure
8436 and then Is_Null_Init_Proc (Subp)
8441 Formal := First_Formal (Subp);
8442 while Present (Formal) loop
8443 T := Etype (Formal);
8445 -- We never need an actual subtype for a constrained formal
8447 if Is_Constrained (T) then
8450 -- If we have unknown discriminants, then we do not need an actual
8451 -- subtype, or more accurately we cannot figure it out! Note that
8452 -- all class-wide types have unknown discriminants.
8454 elsif Has_Unknown_Discriminants (T) then
8457 -- At this stage we have an unconstrained type that may need an
8458 -- actual subtype. For sure the actual subtype is needed if we have
8459 -- an unconstrained array type.
8461 elsif Is_Array_Type (T) then
8464 -- The only other case needing an actual subtype is an unconstrained
8465 -- record type which is an IN parameter (we cannot generate actual
8466 -- subtypes for the OUT or IN OUT case, since an assignment can
8467 -- change the discriminant values. However we exclude the case of
8468 -- initialization procedures, since discriminants are handled very
8469 -- specially in this context, see the section entitled "Handling of
8470 -- Discriminants" in Einfo.
8472 -- We also exclude the case of Discrim_SO_Functions (functions used
8473 -- in front end layout mode for size/offset values), since in such
8474 -- functions only discriminants are referenced, and not only are such
8475 -- subtypes not needed, but they cannot always be generated, because
8476 -- of order of elaboration issues.
8478 elsif Is_Record_Type (T)
8479 and then Ekind (Formal) = E_In_Parameter
8480 and then Chars (Formal) /= Name_uInit
8481 and then not Is_Unchecked_Union (T)
8482 and then not Is_Discrim_SO_Function (Subp)
8486 -- All other cases do not need an actual subtype
8492 -- Generate actual subtypes for unconstrained arrays and
8493 -- unconstrained discriminated records.
8496 if Nkind (N) = N_Accept_Statement then
8498 -- If expansion is active, The formal is replaced by a local
8499 -- variable that renames the corresponding entry of the
8500 -- parameter block, and it is this local variable that may
8501 -- require an actual subtype.
8503 if Expander_Active then
8504 Decl := Build_Actual_Subtype (T, Renamed_Object (Formal));
8506 Decl := Build_Actual_Subtype (T, Formal);
8509 if Present (Handled_Statement_Sequence (N)) then
8511 First (Statements (Handled_Statement_Sequence (N)));
8512 Prepend (Decl, Statements (Handled_Statement_Sequence (N)));
8513 Mark_Rewrite_Insertion (Decl);
8515 -- If the accept statement has no body, there will be no
8516 -- reference to the actuals, so no need to compute actual
8523 Decl := Build_Actual_Subtype (T, Formal);
8524 Prepend (Decl, Declarations (N));
8525 Mark_Rewrite_Insertion (Decl);
8528 -- The declaration uses the bounds of an existing object, and
8529 -- therefore needs no constraint checks.
8531 Analyze (Decl, Suppress => All_Checks);
8533 -- We need to freeze manually the generated type when it is
8534 -- inserted anywhere else than in a declarative part.
8536 if Present (First_Stmt) then
8537 Insert_List_Before_And_Analyze (First_Stmt,
8538 Freeze_Entity (Defining_Identifier (Decl), Loc));
8541 if Nkind (N) = N_Accept_Statement
8542 and then Expander_Active
8544 Set_Actual_Subtype (Renamed_Object (Formal),
8545 Defining_Identifier (Decl));
8547 Set_Actual_Subtype (Formal, Defining_Identifier (Decl));
8551 Next_Formal (Formal);
8553 end Set_Actual_Subtypes;
8555 ---------------------
8556 -- Set_Formal_Mode --
8557 ---------------------
8559 procedure Set_Formal_Mode (Formal_Id : Entity_Id) is
8560 Spec : constant Node_Id := Parent (Formal_Id);
8563 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
8564 -- since we ensure that corresponding actuals are always valid at the
8565 -- point of the call.
8567 if Out_Present (Spec) then
8568 if Ekind (Scope (Formal_Id)) = E_Function
8569 or else Ekind (Scope (Formal_Id)) = E_Generic_Function
8571 Error_Msg_N ("functions can only have IN parameters", Spec);
8572 Set_Ekind (Formal_Id, E_In_Parameter);
8574 elsif In_Present (Spec) then
8575 Set_Ekind (Formal_Id, E_In_Out_Parameter);
8578 Set_Ekind (Formal_Id, E_Out_Parameter);
8579 Set_Never_Set_In_Source (Formal_Id, True);
8580 Set_Is_True_Constant (Formal_Id, False);
8581 Set_Current_Value (Formal_Id, Empty);
8585 Set_Ekind (Formal_Id, E_In_Parameter);
8588 -- Set Is_Known_Non_Null for access parameters since the language
8589 -- guarantees that access parameters are always non-null. We also set
8590 -- Can_Never_Be_Null, since there is no way to change the value.
8592 if Nkind (Parameter_Type (Spec)) = N_Access_Definition then
8594 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
8595 -- null; In Ada 2005, only if then null_exclusion is explicit.
8597 if Ada_Version < Ada_05
8598 or else Can_Never_Be_Null (Etype (Formal_Id))
8600 Set_Is_Known_Non_Null (Formal_Id);
8601 Set_Can_Never_Be_Null (Formal_Id);
8604 -- Ada 2005 (AI-231): Null-exclusion access subtype
8606 elsif Is_Access_Type (Etype (Formal_Id))
8607 and then Can_Never_Be_Null (Etype (Formal_Id))
8609 Set_Is_Known_Non_Null (Formal_Id);
8612 Set_Mechanism (Formal_Id, Default_Mechanism);
8613 Set_Formal_Validity (Formal_Id);
8614 end Set_Formal_Mode;
8616 -------------------------
8617 -- Set_Formal_Validity --
8618 -------------------------
8620 procedure Set_Formal_Validity (Formal_Id : Entity_Id) is
8622 -- If no validity checking, then we cannot assume anything about the
8623 -- validity of parameters, since we do not know there is any checking
8624 -- of the validity on the call side.
8626 if not Validity_Checks_On then
8629 -- If validity checking for parameters is enabled, this means we are
8630 -- not supposed to make any assumptions about argument values.
8632 elsif Validity_Check_Parameters then
8635 -- If we are checking in parameters, we will assume that the caller is
8636 -- also checking parameters, so we can assume the parameter is valid.
8638 elsif Ekind (Formal_Id) = E_In_Parameter
8639 and then Validity_Check_In_Params
8641 Set_Is_Known_Valid (Formal_Id, True);
8643 -- Similar treatment for IN OUT parameters
8645 elsif Ekind (Formal_Id) = E_In_Out_Parameter
8646 and then Validity_Check_In_Out_Params
8648 Set_Is_Known_Valid (Formal_Id, True);
8650 end Set_Formal_Validity;
8652 ------------------------
8653 -- Subtype_Conformant --
8654 ------------------------
8656 function Subtype_Conformant
8657 (New_Id : Entity_Id;
8659 Skip_Controlling_Formals : Boolean := False) return Boolean
8663 Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result,
8664 Skip_Controlling_Formals => Skip_Controlling_Formals);
8666 end Subtype_Conformant;
8668 ---------------------
8669 -- Type_Conformant --
8670 ---------------------
8672 function Type_Conformant
8673 (New_Id : Entity_Id;
8675 Skip_Controlling_Formals : Boolean := False) return Boolean
8679 May_Hide_Profile := False;
8682 (New_Id, Old_Id, Type_Conformant, False, Result,
8683 Skip_Controlling_Formals => Skip_Controlling_Formals);
8685 end Type_Conformant;
8687 -------------------------------
8688 -- Valid_Operator_Definition --
8689 -------------------------------
8691 procedure Valid_Operator_Definition (Designator : Entity_Id) is
8694 Id : constant Name_Id := Chars (Designator);
8698 F := First_Formal (Designator);
8699 while Present (F) loop
8702 if Present (Default_Value (F)) then
8704 ("default values not allowed for operator parameters",
8711 -- Verify that user-defined operators have proper number of arguments
8712 -- First case of operators which can only be unary
8715 or else Id = Name_Op_Abs
8719 -- Case of operators which can be unary or binary
8721 elsif Id = Name_Op_Add
8722 or Id = Name_Op_Subtract
8724 N_OK := (N in 1 .. 2);
8726 -- All other operators can only be binary
8734 ("incorrect number of arguments for operator", Designator);
8738 and then Base_Type (Etype (Designator)) = Standard_Boolean
8739 and then not Is_Intrinsic_Subprogram (Designator)
8742 ("explicit definition of inequality not allowed", Designator);
8744 end Valid_Operator_Definition;