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)
1997 Spec_Id := Build_Private_Protected_Declaration (N);
2000 -- If a separate spec is present, then deal with freezing issues
2002 if Present (Spec_Id) then
2003 Spec_Decl := Unit_Declaration_Node (Spec_Id);
2004 Verify_Overriding_Indicator;
2006 -- In general, the spec will be frozen when we start analyzing the
2007 -- body. However, for internally generated operations, such as
2008 -- wrapper functions for inherited operations with controlling
2009 -- results, the spec may not have been frozen by the time we
2010 -- expand the freeze actions that include the bodies. In particular,
2011 -- extra formals for accessibility or for return-in-place may need
2012 -- to be generated. Freeze nodes, if any, are inserted before the
2015 if not Is_Frozen (Spec_Id)
2016 and then Expander_Active
2018 -- Force the generation of its freezing node to ensure proper
2019 -- management of access types in the backend.
2021 -- This is definitely needed for some cases, but it is not clear
2022 -- why, to be investigated further???
2024 Set_Has_Delayed_Freeze (Spec_Id);
2025 Insert_Actions (N, Freeze_Entity (Spec_Id, Loc));
2029 -- Mark presence of postcondition proc in current scope
2031 if Chars (Body_Id) = Name_uPostconditions then
2032 Set_Has_Postconditions (Current_Scope);
2035 -- Place subprogram on scope stack, and make formals visible. If there
2036 -- is a spec, the visible entity remains that of the spec.
2038 if Present (Spec_Id) then
2039 Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False);
2041 if Is_Child_Unit (Spec_Id) then
2042 Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False);
2046 Style.Check_Identifier (Body_Id, Spec_Id);
2049 Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id));
2050 Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id));
2052 if Is_Abstract_Subprogram (Spec_Id) then
2053 Error_Msg_N ("an abstract subprogram cannot have a body", N);
2057 Set_Convention (Body_Id, Convention (Spec_Id));
2058 Set_Has_Completion (Spec_Id);
2060 if Is_Protected_Type (Scope (Spec_Id)) then
2061 Prot_Typ := Scope (Spec_Id);
2064 -- If this is a body generated for a renaming, do not check for
2065 -- full conformance. The check is redundant, because the spec of
2066 -- the body is a copy of the spec in the renaming declaration,
2067 -- and the test can lead to spurious errors on nested defaults.
2069 if Present (Spec_Decl)
2070 and then not Comes_From_Source (N)
2072 (Nkind (Original_Node (Spec_Decl)) =
2073 N_Subprogram_Renaming_Declaration
2074 or else (Present (Corresponding_Body (Spec_Decl))
2076 Nkind (Unit_Declaration_Node
2077 (Corresponding_Body (Spec_Decl))) =
2078 N_Subprogram_Renaming_Declaration))
2085 Fully_Conformant, True, Conformant, Body_Id);
2088 -- If the body is not fully conformant, we have to decide if we
2089 -- should analyze it or not. If it has a really messed up profile
2090 -- then we probably should not analyze it, since we will get too
2091 -- many bogus messages.
2093 -- Our decision is to go ahead in the non-fully conformant case
2094 -- only if it is at least mode conformant with the spec. Note
2095 -- that the call to Check_Fully_Conformant has issued the proper
2096 -- error messages to complain about the lack of conformance.
2099 and then not Mode_Conformant (Body_Id, Spec_Id)
2105 if Spec_Id /= Body_Id then
2106 Reference_Body_Formals (Spec_Id, Body_Id);
2109 if Nkind (N) /= N_Subprogram_Body_Stub then
2110 Set_Corresponding_Spec (N, Spec_Id);
2112 -- Ada 2005 (AI-345): If the operation is a primitive operation
2113 -- of a concurrent type, the type of the first parameter has been
2114 -- replaced with the corresponding record, which is the proper
2115 -- run-time structure to use. However, within the body there may
2116 -- be uses of the formals that depend on primitive operations
2117 -- of the type (in particular calls in prefixed form) for which
2118 -- we need the original concurrent type. The operation may have
2119 -- several controlling formals, so the replacement must be done
2122 if Comes_From_Source (Spec_Id)
2123 and then Present (First_Entity (Spec_Id))
2124 and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type
2125 and then Is_Tagged_Type (Etype (First_Entity (Spec_Id)))
2127 Present (Interfaces (Etype (First_Entity (Spec_Id))))
2130 (Corresponding_Concurrent_Type
2131 (Etype (First_Entity (Spec_Id))))
2134 Typ : constant Entity_Id := Etype (First_Entity (Spec_Id));
2138 Form := First_Formal (Spec_Id);
2139 while Present (Form) loop
2140 if Etype (Form) = Typ then
2141 Set_Etype (Form, Corresponding_Concurrent_Type (Typ));
2149 -- Make the formals visible, and place subprogram on scope stack.
2150 -- This is also the point at which we set Last_Real_Spec_Entity
2151 -- to mark the entities which will not be moved to the body.
2153 Install_Formals (Spec_Id);
2154 Last_Real_Spec_Entity := Last_Entity (Spec_Id);
2155 Push_Scope (Spec_Id);
2157 -- Make sure that the subprogram is immediately visible. For
2158 -- child units that have no separate spec this is indispensable.
2159 -- Otherwise it is safe albeit redundant.
2161 Set_Is_Immediately_Visible (Spec_Id);
2164 Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id);
2165 Set_Ekind (Body_Id, E_Subprogram_Body);
2166 Set_Scope (Body_Id, Scope (Spec_Id));
2167 Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id));
2169 -- Case of subprogram body with no previous spec
2173 and then Comes_From_Source (Body_Id)
2174 and then not Suppress_Style_Checks (Body_Id)
2175 and then not In_Instance
2177 Style.Body_With_No_Spec (N);
2180 New_Overloaded_Entity (Body_Id);
2182 if Nkind (N) /= N_Subprogram_Body_Stub then
2183 Set_Acts_As_Spec (N);
2184 Generate_Definition (Body_Id);
2186 (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True);
2187 Generate_Reference_To_Formals (Body_Id);
2188 Install_Formals (Body_Id);
2189 Push_Scope (Body_Id);
2193 -- If the return type is an anonymous access type whose designated type
2194 -- is the limited view of a class-wide type and the non-limited view is
2195 -- available, update the return type accordingly.
2197 if Ada_Version >= Ada_05
2198 and then Comes_From_Source (N)
2205 Rtyp := Etype (Current_Scope);
2207 if Ekind (Rtyp) = E_Anonymous_Access_Type then
2208 Etyp := Directly_Designated_Type (Rtyp);
2210 if Is_Class_Wide_Type (Etyp)
2211 and then From_With_Type (Etyp)
2213 Set_Directly_Designated_Type
2214 (Etype (Current_Scope), Available_View (Etyp));
2220 -- If this is the proper body of a stub, we must verify that the stub
2221 -- conforms to the body, and to the previous spec if one was present.
2222 -- we know already that the body conforms to that spec. This test is
2223 -- only required for subprograms that come from source.
2225 if Nkind (Parent (N)) = N_Subunit
2226 and then Comes_From_Source (N)
2227 and then not Error_Posted (Body_Id)
2228 and then Nkind (Corresponding_Stub (Parent (N))) =
2229 N_Subprogram_Body_Stub
2232 Old_Id : constant Entity_Id :=
2234 (Specification (Corresponding_Stub (Parent (N))));
2236 Conformant : Boolean := False;
2239 if No (Spec_Id) then
2240 Check_Fully_Conformant (Body_Id, Old_Id);
2244 (Body_Id, Old_Id, Fully_Conformant, False, Conformant);
2246 if not Conformant then
2248 -- The stub was taken to be a new declaration. Indicate
2249 -- that it lacks a body.
2251 Set_Has_Completion (Old_Id, False);
2257 Set_Has_Completion (Body_Id);
2258 Check_Eliminated (Body_Id);
2260 if Nkind (N) = N_Subprogram_Body_Stub then
2263 elsif Present (Spec_Id)
2264 and then Expander_Active
2266 (Has_Pragma_Inline_Always (Spec_Id)
2267 or else (Has_Pragma_Inline (Spec_Id) and Front_End_Inlining))
2269 Build_Body_To_Inline (N, Spec_Id);
2272 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2273 -- if its specification we have to install the private withed units.
2274 -- This holds for child units as well.
2276 if Is_Compilation_Unit (Body_Id)
2277 or else Nkind (Parent (N)) = N_Compilation_Unit
2279 Install_Private_With_Clauses (Body_Id);
2282 Check_Anonymous_Return;
2284 -- Set the Protected_Formal field of each extra formal of the protected
2285 -- subprogram to reference the corresponding extra formal of the
2286 -- subprogram that implements it. For regular formals this occurs when
2287 -- the protected subprogram's declaration is expanded, but the extra
2288 -- formals don't get created until the subprogram is frozen. We need to
2289 -- do this before analyzing the protected subprogram's body so that any
2290 -- references to the original subprogram's extra formals will be changed
2291 -- refer to the implementing subprogram's formals (see Expand_Formal).
2293 if Present (Spec_Id)
2294 and then Is_Protected_Type (Scope (Spec_Id))
2295 and then Present (Protected_Body_Subprogram (Spec_Id))
2298 Impl_Subp : constant Entity_Id :=
2299 Protected_Body_Subprogram (Spec_Id);
2300 Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id);
2301 Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp);
2303 while Present (Prot_Ext_Formal) loop
2304 pragma Assert (Present (Impl_Ext_Formal));
2305 Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal);
2306 Next_Formal_With_Extras (Prot_Ext_Formal);
2307 Next_Formal_With_Extras (Impl_Ext_Formal);
2312 -- Now we can go on to analyze the body
2314 HSS := Handled_Statement_Sequence (N);
2315 Set_Actual_Subtypes (N, Current_Scope);
2317 -- Deal with preconditions and postconditions
2319 Process_PPCs (N, Spec_Id, Body_Id);
2321 -- Add a declaration for the Protection object, renaming declarations
2322 -- for discriminals and privals and finally a declaration for the entry
2323 -- family index (if applicable). This form of early expansion is done
2324 -- when the Expander is active because Install_Private_Data_Declarations
2325 -- references entities which were created during regular expansion.
2328 and then Comes_From_Source (N)
2329 and then Present (Prot_Typ)
2330 and then Present (Spec_Id)
2331 and then not Is_Eliminated (Spec_Id)
2333 Install_Private_Data_Declarations
2334 (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N));
2337 -- Analyze the declarations (this call will analyze the precondition
2338 -- Check pragmas we prepended to the list, as well as the declaration
2339 -- of the _Postconditions procedure).
2341 Analyze_Declarations (Declarations (N));
2343 -- Check completion, and analyze the statements
2346 Inspect_Deferred_Constant_Completion (Declarations (N));
2349 -- Deal with end of scope processing for the body
2351 Process_End_Label (HSS, 't', Current_Scope);
2353 Check_Subprogram_Order (N);
2354 Set_Analyzed (Body_Id);
2356 -- If we have a separate spec, then the analysis of the declarations
2357 -- caused the entities in the body to be chained to the spec id, but
2358 -- we want them chained to the body id. Only the formal parameters
2359 -- end up chained to the spec id in this case.
2361 if Present (Spec_Id) then
2363 -- We must conform to the categorization of our spec
2365 Validate_Categorization_Dependency (N, Spec_Id);
2367 -- And if this is a child unit, the parent units must conform
2369 if Is_Child_Unit (Spec_Id) then
2370 Validate_Categorization_Dependency
2371 (Unit_Declaration_Node (Spec_Id), Spec_Id);
2374 -- Here is where we move entities from the spec to the body
2376 -- Case where there are entities that stay with the spec
2378 if Present (Last_Real_Spec_Entity) then
2380 -- No body entities (happens when the only real spec entities
2381 -- come from precondition and postcondition pragmas)
2383 if No (Last_Entity (Body_Id)) then
2385 (Body_Id, Next_Entity (Last_Real_Spec_Entity));
2387 -- Body entities present (formals), so chain stuff past them
2391 (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity));
2394 Set_Next_Entity (Last_Real_Spec_Entity, Empty);
2395 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
2396 Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity);
2398 -- Case where there are no spec entities, in this case there can
2399 -- be no body entities either, so just move everything.
2402 pragma Assert (No (Last_Entity (Body_Id)));
2403 Set_First_Entity (Body_Id, First_Entity (Spec_Id));
2404 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
2405 Set_First_Entity (Spec_Id, Empty);
2406 Set_Last_Entity (Spec_Id, Empty);
2410 -- If function, check return statements
2412 if Nkind (Body_Spec) = N_Function_Specification then
2417 if Present (Spec_Id) then
2423 if Return_Present (Id) then
2424 Check_Returns (HSS, 'F', Missing_Ret);
2427 Set_Has_Missing_Return (Id);
2430 elsif not Is_Machine_Code_Subprogram (Id)
2431 and then not Body_Deleted
2433 Error_Msg_N ("missing RETURN statement in function body", N);
2437 -- If procedure with No_Return, check returns
2439 elsif Nkind (Body_Spec) = N_Procedure_Specification
2440 and then Present (Spec_Id)
2441 and then No_Return (Spec_Id)
2443 Check_Returns (HSS, 'P', Missing_Ret, Spec_Id);
2446 -- Now we are going to check for variables that are never modified in
2447 -- the body of the procedure. But first we deal with a special case
2448 -- where we want to modify this check. If the body of the subprogram
2449 -- starts with a raise statement or its equivalent, or if the body
2450 -- consists entirely of a null statement, then it is pretty obvious
2451 -- that it is OK to not reference the parameters. For example, this
2452 -- might be the following common idiom for a stubbed function:
2453 -- statement of the procedure raises an exception. In particular this
2454 -- deals with the common idiom of a stubbed function, which might
2455 -- appear as something like
2457 -- function F (A : Integer) return Some_Type;
2460 -- raise Program_Error;
2464 -- Here the purpose of X is simply to satisfy the annoying requirement
2465 -- in Ada that there be at least one return, and we certainly do not
2466 -- want to go posting warnings on X that it is not initialized! On
2467 -- the other hand, if X is entirely unreferenced that should still
2470 -- What we do is to detect these cases, and if we find them, flag the
2471 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2472 -- suppress unwanted warnings. For the case of the function stub above
2473 -- we have a special test to set X as apparently assigned to suppress
2480 -- Skip initial labels (for one thing this occurs when we are in
2481 -- front end ZCX mode, but in any case it is irrelevant), and also
2482 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2484 Stm := First (Statements (HSS));
2485 while Nkind (Stm) = N_Label
2486 or else Nkind (Stm) in N_Push_xxx_Label
2491 -- Do the test on the original statement before expansion
2494 Ostm : constant Node_Id := Original_Node (Stm);
2497 -- If explicit raise statement, turn on flag
2499 if Nkind (Ostm) = N_Raise_Statement then
2500 Set_Trivial_Subprogram (Stm);
2502 -- If null statement, and no following statements, turn on flag
2504 elsif Nkind (Stm) = N_Null_Statement
2505 and then Comes_From_Source (Stm)
2506 and then No (Next (Stm))
2508 Set_Trivial_Subprogram (Stm);
2510 -- Check for explicit call cases which likely raise an exception
2512 elsif Nkind (Ostm) = N_Procedure_Call_Statement then
2513 if Is_Entity_Name (Name (Ostm)) then
2515 Ent : constant Entity_Id := Entity (Name (Ostm));
2518 -- If the procedure is marked No_Return, then likely it
2519 -- raises an exception, but in any case it is not coming
2520 -- back here, so turn on the flag.
2522 if Ekind (Ent) = E_Procedure
2523 and then No_Return (Ent)
2525 Set_Trivial_Subprogram (Stm);
2533 -- Check for variables that are never modified
2539 -- If there is a separate spec, then transfer Never_Set_In_Source
2540 -- flags from out parameters to the corresponding entities in the
2541 -- body. The reason we do that is we want to post error flags on
2542 -- the body entities, not the spec entities.
2544 if Present (Spec_Id) then
2545 E1 := First_Entity (Spec_Id);
2546 while Present (E1) loop
2547 if Ekind (E1) = E_Out_Parameter then
2548 E2 := First_Entity (Body_Id);
2549 while Present (E2) loop
2550 exit when Chars (E1) = Chars (E2);
2554 if Present (E2) then
2555 Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1));
2563 -- Check references in body unless it was deleted. Note that the
2564 -- check of Body_Deleted here is not just for efficiency, it is
2565 -- necessary to avoid junk warnings on formal parameters.
2567 if not Body_Deleted then
2568 Check_References (Body_Id);
2571 end Analyze_Subprogram_Body_Helper;
2573 ------------------------------------
2574 -- Analyze_Subprogram_Declaration --
2575 ------------------------------------
2577 procedure Analyze_Subprogram_Declaration (N : Node_Id) is
2578 Loc : constant Source_Ptr := Sloc (N);
2579 Designator : Entity_Id;
2581 Scop : constant Entity_Id := Current_Scope;
2582 Null_Body : Node_Id := Empty;
2584 -- Start of processing for Analyze_Subprogram_Declaration
2587 -- For a null procedure, capture the profile before analysis, for
2588 -- expansion at the freeze point and at each point of call.
2589 -- The body will only be used if the procedure has preconditions.
2590 -- In that case the body is analyzed at the freeze point.
2592 if Nkind (Specification (N)) = N_Procedure_Specification
2593 and then Null_Present (Specification (N))
2594 and then Expander_Active
2597 Make_Subprogram_Body (Loc,
2599 New_Copy_Tree (Specification (N)),
2602 Handled_Statement_Sequence =>
2603 Make_Handled_Sequence_Of_Statements (Loc,
2604 Statements => New_List (Make_Null_Statement (Loc))));
2606 -- Create new entities for body and formals
2608 Set_Defining_Unit_Name (Specification (Null_Body),
2609 Make_Defining_Identifier (Loc, Chars (Defining_Entity (N))));
2610 Set_Corresponding_Body (N, Defining_Entity (Null_Body));
2612 Form := First (Parameter_Specifications (Specification (Null_Body)));
2613 while Present (Form) loop
2614 Set_Defining_Identifier (Form,
2615 Make_Defining_Identifier (Loc,
2616 Chars (Defining_Identifier (Form))));
2620 if Is_Protected_Type (Current_Scope) then
2622 ("protected operation cannot be a null procedure", N);
2626 Designator := Analyze_Subprogram_Specification (Specification (N));
2627 Generate_Definition (Designator);
2629 if Debug_Flag_C then
2630 Write_Str ("==> subprogram spec ");
2631 Write_Name (Chars (Designator));
2632 Write_Str (" from ");
2633 Write_Location (Sloc (N));
2638 if Nkind (Specification (N)) = N_Procedure_Specification
2639 and then Null_Present (Specification (N))
2641 Set_Has_Completion (Designator);
2643 if Present (Null_Body) then
2644 Set_Corresponding_Body (N, Defining_Entity (Null_Body));
2645 Set_Body_To_Inline (N, Null_Body);
2646 Set_Is_Inlined (Designator);
2650 Validate_RCI_Subprogram_Declaration (N);
2651 New_Overloaded_Entity (Designator);
2652 Check_Delayed_Subprogram (Designator);
2654 -- If the type of the first formal of the current subprogram is a
2655 -- nongeneric tagged private type, mark the subprogram as being a
2656 -- private primitive. Ditto if this is a function with controlling
2657 -- result, and the return type is currently private. In both cases,
2658 -- the type of the controlling argument or result must be in the
2659 -- current scope for the operation to be primitive.
2661 if Has_Controlling_Result (Designator)
2662 and then Is_Private_Type (Etype (Designator))
2663 and then Scope (Etype (Designator)) = Current_Scope
2664 and then not Is_Generic_Actual_Type (Etype (Designator))
2666 Set_Is_Private_Primitive (Designator);
2668 elsif Present (First_Formal (Designator)) then
2670 Formal_Typ : constant Entity_Id :=
2671 Etype (First_Formal (Designator));
2673 Set_Is_Private_Primitive (Designator,
2674 Is_Tagged_Type (Formal_Typ)
2675 and then Scope (Formal_Typ) = Current_Scope
2676 and then Is_Private_Type (Formal_Typ)
2677 and then not Is_Generic_Actual_Type (Formal_Typ));
2681 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2684 if Ada_Version >= Ada_05
2685 and then Comes_From_Source (N)
2686 and then Is_Dispatching_Operation (Designator)
2693 if Has_Controlling_Result (Designator) then
2694 Etyp := Etype (Designator);
2697 E := First_Entity (Designator);
2699 and then Is_Formal (E)
2700 and then not Is_Controlling_Formal (E)
2708 if Is_Access_Type (Etyp) then
2709 Etyp := Directly_Designated_Type (Etyp);
2712 if Is_Interface (Etyp)
2713 and then not Is_Abstract_Subprogram (Designator)
2714 and then not (Ekind (Designator) = E_Procedure
2715 and then Null_Present (Specification (N)))
2717 Error_Msg_Name_1 := Chars (Defining_Entity (N));
2719 ("(Ada 2005) interface subprogram % must be abstract or null",
2725 -- What is the following code for, it used to be
2727 -- ??? Set_Suppress_Elaboration_Checks
2728 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2730 -- The following seems equivalent, but a bit dubious
2732 if Elaboration_Checks_Suppressed (Designator) then
2733 Set_Kill_Elaboration_Checks (Designator);
2736 if Scop /= Standard_Standard
2737 and then not Is_Child_Unit (Designator)
2739 Set_Categorization_From_Scope (Designator, Scop);
2741 -- For a compilation unit, check for library-unit pragmas
2743 Push_Scope (Designator);
2744 Set_Categorization_From_Pragmas (N);
2745 Validate_Categorization_Dependency (N, Designator);
2749 -- For a compilation unit, set body required. This flag will only be
2750 -- reset if a valid Import or Interface pragma is processed later on.
2752 if Nkind (Parent (N)) = N_Compilation_Unit then
2753 Set_Body_Required (Parent (N), True);
2755 if Ada_Version >= Ada_05
2756 and then Nkind (Specification (N)) = N_Procedure_Specification
2757 and then Null_Present (Specification (N))
2760 ("null procedure cannot be declared at library level", N);
2764 Generate_Reference_To_Formals (Designator);
2765 Check_Eliminated (Designator);
2767 if Debug_Flag_C then
2769 Write_Str ("<== subprogram spec ");
2770 Write_Name (Chars (Designator));
2771 Write_Str (" from ");
2772 Write_Location (Sloc (N));
2775 end Analyze_Subprogram_Declaration;
2777 --------------------------------------
2778 -- Analyze_Subprogram_Specification --
2779 --------------------------------------
2781 -- Reminder: N here really is a subprogram specification (not a subprogram
2782 -- declaration). This procedure is called to analyze the specification in
2783 -- both subprogram bodies and subprogram declarations (specs).
2785 function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is
2786 Designator : constant Entity_Id := Defining_Entity (N);
2787 Formals : constant List_Id := Parameter_Specifications (N);
2789 -- Start of processing for Analyze_Subprogram_Specification
2792 Generate_Definition (Designator);
2794 if Nkind (N) = N_Function_Specification then
2795 Set_Ekind (Designator, E_Function);
2796 Set_Mechanism (Designator, Default_Mechanism);
2799 Set_Ekind (Designator, E_Procedure);
2800 Set_Etype (Designator, Standard_Void_Type);
2803 -- Introduce new scope for analysis of the formals and the return type
2805 Set_Scope (Designator, Current_Scope);
2807 if Present (Formals) then
2808 Push_Scope (Designator);
2809 Process_Formals (Formals, N);
2811 -- Ada 2005 (AI-345): If this is an overriding operation of an
2812 -- inherited interface operation, and the controlling type is
2813 -- a synchronized type, replace the type with its corresponding
2814 -- record, to match the proper signature of an overriding operation.
2815 -- Same processing for an access parameter whose designated type is
2816 -- derived from a synchronized interface.
2818 if Ada_Version >= Ada_05 then
2821 Formal_Typ : Entity_Id;
2822 Rec_Typ : Entity_Id;
2823 Desig_Typ : Entity_Id;
2826 Formal := First_Formal (Designator);
2827 while Present (Formal) loop
2828 Formal_Typ := Etype (Formal);
2830 if Is_Concurrent_Type (Formal_Typ)
2831 and then Present (Corresponding_Record_Type (Formal_Typ))
2833 Rec_Typ := Corresponding_Record_Type (Formal_Typ);
2835 if Present (Interfaces (Rec_Typ)) then
2836 Set_Etype (Formal, Rec_Typ);
2839 elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then
2840 Desig_Typ := Designated_Type (Formal_Typ);
2842 if Is_Concurrent_Type (Desig_Typ)
2843 and then Present (Corresponding_Record_Type (Desig_Typ))
2845 Rec_Typ := Corresponding_Record_Type (Desig_Typ);
2847 if Present (Interfaces (Rec_Typ)) then
2848 Set_Directly_Designated_Type (Formal_Typ, Rec_Typ);
2853 Next_Formal (Formal);
2860 -- The subprogram scope is pushed and popped around the processing of
2861 -- the return type for consistency with call above to Process_Formals
2862 -- (which itself can call Analyze_Return_Type), and to ensure that any
2863 -- itype created for the return type will be associated with the proper
2866 elsif Nkind (N) = N_Function_Specification then
2867 Push_Scope (Designator);
2869 Analyze_Return_Type (N);
2874 if Nkind (N) = N_Function_Specification then
2875 if Nkind (Designator) = N_Defining_Operator_Symbol then
2876 Valid_Operator_Definition (Designator);
2879 May_Need_Actuals (Designator);
2881 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2882 -- the subprogram is abstract also. This does not apply to renaming
2883 -- declarations, where abstractness is inherited.
2884 -- In case of primitives associated with abstract interface types
2885 -- the check is applied later (see Analyze_Subprogram_Declaration).
2887 if Is_Abstract_Type (Etype (Designator))
2888 and then not Is_Interface (Etype (Designator))
2889 and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration
2890 and then Nkind (Parent (N)) /=
2891 N_Abstract_Subprogram_Declaration
2893 (Nkind (Parent (N))) /= N_Formal_Abstract_Subprogram_Declaration
2896 ("function that returns abstract type must be abstract", N);
2901 end Analyze_Subprogram_Specification;
2903 --------------------------
2904 -- Build_Body_To_Inline --
2905 --------------------------
2907 procedure Build_Body_To_Inline (N : Node_Id; Subp : Entity_Id) is
2908 Decl : constant Node_Id := Unit_Declaration_Node (Subp);
2909 Original_Body : Node_Id;
2910 Body_To_Analyze : Node_Id;
2911 Max_Size : constant := 10;
2912 Stat_Count : Integer := 0;
2914 function Has_Excluded_Declaration (Decls : List_Id) return Boolean;
2915 -- Check for declarations that make inlining not worthwhile
2917 function Has_Excluded_Statement (Stats : List_Id) return Boolean;
2918 -- Check for statements that make inlining not worthwhile: any tasking
2919 -- statement, nested at any level. Keep track of total number of
2920 -- elementary statements, as a measure of acceptable size.
2922 function Has_Pending_Instantiation return Boolean;
2923 -- If some enclosing body contains instantiations that appear before the
2924 -- corresponding generic body, the enclosing body has a freeze node so
2925 -- that it can be elaborated after the generic itself. This might
2926 -- conflict with subsequent inlinings, so that it is unsafe to try to
2927 -- inline in such a case.
2929 function Has_Single_Return return Boolean;
2930 -- In general we cannot inline functions that return unconstrained type.
2931 -- However, we can handle such functions if all return statements return
2932 -- a local variable that is the only declaration in the body of the
2933 -- function. In that case the call can be replaced by that local
2934 -- variable as is done for other inlined calls.
2936 procedure Remove_Pragmas;
2937 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2938 -- parameter has no meaning when the body is inlined and the formals
2939 -- are rewritten. Remove it from body to inline. The analysis of the
2940 -- non-inlined body will handle the pragma properly.
2942 function Uses_Secondary_Stack (Bod : Node_Id) return Boolean;
2943 -- If the body of the subprogram includes a call that returns an
2944 -- unconstrained type, the secondary stack is involved, and it
2945 -- is not worth inlining.
2947 ------------------------------
2948 -- Has_Excluded_Declaration --
2949 ------------------------------
2951 function Has_Excluded_Declaration (Decls : List_Id) return Boolean is
2954 function Is_Unchecked_Conversion (D : Node_Id) return Boolean;
2955 -- Nested subprograms make a given body ineligible for inlining, but
2956 -- we make an exception for instantiations of unchecked conversion.
2957 -- The body has not been analyzed yet, so check the name, and verify
2958 -- that the visible entity with that name is the predefined unit.
2960 -----------------------------
2961 -- Is_Unchecked_Conversion --
2962 -----------------------------
2964 function Is_Unchecked_Conversion (D : Node_Id) return Boolean is
2965 Id : constant Node_Id := Name (D);
2969 if Nkind (Id) = N_Identifier
2970 and then Chars (Id) = Name_Unchecked_Conversion
2972 Conv := Current_Entity (Id);
2974 elsif Nkind_In (Id, N_Selected_Component, N_Expanded_Name)
2975 and then Chars (Selector_Name (Id)) = Name_Unchecked_Conversion
2977 Conv := Current_Entity (Selector_Name (Id));
2982 return Present (Conv)
2983 and then Is_Predefined_File_Name
2984 (Unit_File_Name (Get_Source_Unit (Conv)))
2985 and then Is_Intrinsic_Subprogram (Conv);
2986 end Is_Unchecked_Conversion;
2988 -- Start of processing for Has_Excluded_Declaration
2992 while Present (D) loop
2993 if (Nkind (D) = N_Function_Instantiation
2994 and then not Is_Unchecked_Conversion (D))
2995 or else Nkind_In (D, N_Protected_Type_Declaration,
2996 N_Package_Declaration,
2997 N_Package_Instantiation,
2999 N_Procedure_Instantiation,
3000 N_Task_Type_Declaration)
3003 ("cannot inline & (non-allowed declaration)?", D, Subp);
3011 end Has_Excluded_Declaration;
3013 ----------------------------
3014 -- Has_Excluded_Statement --
3015 ----------------------------
3017 function Has_Excluded_Statement (Stats : List_Id) return Boolean is
3023 while Present (S) loop
3024 Stat_Count := Stat_Count + 1;
3026 if Nkind_In (S, N_Abort_Statement,
3027 N_Asynchronous_Select,
3028 N_Conditional_Entry_Call,
3029 N_Delay_Relative_Statement,
3030 N_Delay_Until_Statement,
3035 ("cannot inline & (non-allowed statement)?", S, Subp);
3038 elsif Nkind (S) = N_Block_Statement then
3039 if Present (Declarations (S))
3040 and then Has_Excluded_Declaration (Declarations (S))
3044 elsif Present (Handled_Statement_Sequence (S))
3047 (Exception_Handlers (Handled_Statement_Sequence (S)))
3049 Has_Excluded_Statement
3050 (Statements (Handled_Statement_Sequence (S))))
3055 elsif Nkind (S) = N_Case_Statement then
3056 E := First (Alternatives (S));
3057 while Present (E) loop
3058 if Has_Excluded_Statement (Statements (E)) then
3065 elsif Nkind (S) = N_If_Statement then
3066 if Has_Excluded_Statement (Then_Statements (S)) then
3070 if Present (Elsif_Parts (S)) then
3071 E := First (Elsif_Parts (S));
3072 while Present (E) loop
3073 if Has_Excluded_Statement (Then_Statements (E)) then
3080 if Present (Else_Statements (S))
3081 and then Has_Excluded_Statement (Else_Statements (S))
3086 elsif Nkind (S) = N_Loop_Statement
3087 and then Has_Excluded_Statement (Statements (S))
3096 end Has_Excluded_Statement;
3098 -------------------------------
3099 -- Has_Pending_Instantiation --
3100 -------------------------------
3102 function Has_Pending_Instantiation return Boolean is
3107 while Present (S) loop
3108 if Is_Compilation_Unit (S)
3109 or else Is_Child_Unit (S)
3112 elsif Ekind (S) = E_Package
3113 and then Has_Forward_Instantiation (S)
3122 end Has_Pending_Instantiation;
3124 ------------------------
3125 -- Has_Single_Return --
3126 ------------------------
3128 function Has_Single_Return return Boolean is
3129 Return_Statement : Node_Id := Empty;
3131 function Check_Return (N : Node_Id) return Traverse_Result;
3137 function Check_Return (N : Node_Id) return Traverse_Result is
3139 if Nkind (N) = N_Simple_Return_Statement then
3140 if Present (Expression (N))
3141 and then Is_Entity_Name (Expression (N))
3143 if No (Return_Statement) then
3144 Return_Statement := N;
3147 elsif Chars (Expression (N)) =
3148 Chars (Expression (Return_Statement))
3157 -- Expression has wrong form
3167 function Check_All_Returns is new Traverse_Func (Check_Return);
3169 -- Start of processing for Has_Single_Return
3172 return Check_All_Returns (N) = OK
3173 and then Present (Declarations (N))
3174 and then Present (First (Declarations (N)))
3175 and then Chars (Expression (Return_Statement)) =
3176 Chars (Defining_Identifier (First (Declarations (N))));
3177 end Has_Single_Return;
3179 --------------------
3180 -- Remove_Pragmas --
3181 --------------------
3183 procedure Remove_Pragmas is
3188 Decl := First (Declarations (Body_To_Analyze));
3189 while Present (Decl) loop
3192 if Nkind (Decl) = N_Pragma
3193 and then (Pragma_Name (Decl) = Name_Unreferenced
3195 Pragma_Name (Decl) = Name_Unmodified)
3204 --------------------------
3205 -- Uses_Secondary_Stack --
3206 --------------------------
3208 function Uses_Secondary_Stack (Bod : Node_Id) return Boolean is
3209 function Check_Call (N : Node_Id) return Traverse_Result;
3210 -- Look for function calls that return an unconstrained type
3216 function Check_Call (N : Node_Id) return Traverse_Result is
3218 if Nkind (N) = N_Function_Call
3219 and then Is_Entity_Name (Name (N))
3220 and then Is_Composite_Type (Etype (Entity (Name (N))))
3221 and then not Is_Constrained (Etype (Entity (Name (N))))
3224 ("cannot inline & (call returns unconstrained type)?",
3232 function Check_Calls is new Traverse_Func (Check_Call);
3235 return Check_Calls (Bod) = Abandon;
3236 end Uses_Secondary_Stack;
3238 -- Start of processing for Build_Body_To_Inline
3241 -- Return immediately if done already
3243 if Nkind (Decl) = N_Subprogram_Declaration
3244 and then Present (Body_To_Inline (Decl))
3248 -- Functions that return unconstrained composite types require
3249 -- secondary stack handling, and cannot currently be inlined, unless
3250 -- all return statements return a local variable that is the first
3251 -- local declaration in the body.
3253 elsif Ekind (Subp) = E_Function
3254 and then not Is_Scalar_Type (Etype (Subp))
3255 and then not Is_Access_Type (Etype (Subp))
3256 and then not Is_Constrained (Etype (Subp))
3258 if not Has_Single_Return then
3260 ("cannot inline & (unconstrained return type)?", N, Subp);
3264 -- Ditto for functions that return controlled types, where controlled
3265 -- actions interfere in complex ways with inlining.
3267 elsif Ekind (Subp) = E_Function
3268 and then Needs_Finalization (Etype (Subp))
3271 ("cannot inline & (controlled return type)?", N, Subp);
3275 if Present (Declarations (N))
3276 and then Has_Excluded_Declaration (Declarations (N))
3281 if Present (Handled_Statement_Sequence (N)) then
3282 if Present (Exception_Handlers (Handled_Statement_Sequence (N))) then
3284 ("cannot inline& (exception handler)?",
3285 First (Exception_Handlers (Handled_Statement_Sequence (N))),
3289 Has_Excluded_Statement
3290 (Statements (Handled_Statement_Sequence (N)))
3296 -- We do not inline a subprogram that is too large, unless it is
3297 -- marked Inline_Always. This pragma does not suppress the other
3298 -- checks on inlining (forbidden declarations, handlers, etc).
3300 if Stat_Count > Max_Size
3301 and then not Has_Pragma_Inline_Always (Subp)
3303 Cannot_Inline ("cannot inline& (body too large)?", N, Subp);
3307 if Has_Pending_Instantiation then
3309 ("cannot inline& (forward instance within enclosing body)?",
3314 -- Within an instance, the body to inline must be treated as a nested
3315 -- generic, so that the proper global references are preserved.
3317 -- Note that we do not do this at the library level, because it is not
3318 -- needed, and furthermore this causes trouble if front end inlining
3319 -- is activated (-gnatN).
3321 if In_Instance and then Scope (Current_Scope) /= Standard_Standard then
3322 Save_Env (Scope (Current_Scope), Scope (Current_Scope));
3323 Original_Body := Copy_Generic_Node (N, Empty, True);
3325 Original_Body := Copy_Separate_Tree (N);
3328 -- We need to capture references to the formals in order to substitute
3329 -- the actuals at the point of inlining, i.e. instantiation. To treat
3330 -- the formals as globals to the body to inline, we nest it within
3331 -- a dummy parameterless subprogram, declared within the real one.
3332 -- To avoid generating an internal name (which is never public, and
3333 -- which affects serial numbers of other generated names), we use
3334 -- an internal symbol that cannot conflict with user declarations.
3336 Set_Parameter_Specifications (Specification (Original_Body), No_List);
3337 Set_Defining_Unit_Name
3338 (Specification (Original_Body),
3339 Make_Defining_Identifier (Sloc (N), Name_uParent));
3340 Set_Corresponding_Spec (Original_Body, Empty);
3342 Body_To_Analyze := Copy_Generic_Node (Original_Body, Empty, False);
3344 -- Set return type of function, which is also global and does not need
3347 if Ekind (Subp) = E_Function then
3348 Set_Result_Definition (Specification (Body_To_Analyze),
3349 New_Occurrence_Of (Etype (Subp), Sloc (N)));
3352 if No (Declarations (N)) then
3353 Set_Declarations (N, New_List (Body_To_Analyze));
3355 Append (Body_To_Analyze, Declarations (N));
3358 Expander_Mode_Save_And_Set (False);
3361 Analyze (Body_To_Analyze);
3362 Push_Scope (Defining_Entity (Body_To_Analyze));
3363 Save_Global_References (Original_Body);
3365 Remove (Body_To_Analyze);
3367 Expander_Mode_Restore;
3369 -- Restore environment if previously saved
3371 if In_Instance and then Scope (Current_Scope) /= Standard_Standard then
3375 -- If secondary stk used there is no point in inlining. We have
3376 -- already issued the warning in this case, so nothing to do.
3378 if Uses_Secondary_Stack (Body_To_Analyze) then
3382 Set_Body_To_Inline (Decl, Original_Body);
3383 Set_Ekind (Defining_Entity (Original_Body), Ekind (Subp));
3384 Set_Is_Inlined (Subp);
3385 end Build_Body_To_Inline;
3391 procedure Cannot_Inline (Msg : String; N : Node_Id; Subp : Entity_Id) is
3393 -- Do not emit warning if this is a predefined unit which is not
3394 -- the main unit. With validity checks enabled, some predefined
3395 -- subprograms may contain nested subprograms and become ineligible
3398 if Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Subp)))
3399 and then not In_Extended_Main_Source_Unit (Subp)
3403 elsif Has_Pragma_Inline_Always (Subp) then
3405 -- Remove last character (question mark) to make this into an error,
3406 -- because the Inline_Always pragma cannot be obeyed.
3408 Error_Msg_NE (Msg (Msg'First .. Msg'Last - 1), N, Subp);
3410 elsif Ineffective_Inline_Warnings then
3411 Error_Msg_NE (Msg, N, Subp);
3415 -----------------------
3416 -- Check_Conformance --
3417 -----------------------
3419 procedure Check_Conformance
3420 (New_Id : Entity_Id;
3422 Ctype : Conformance_Type;
3424 Conforms : out Boolean;
3425 Err_Loc : Node_Id := Empty;
3426 Get_Inst : Boolean := False;
3427 Skip_Controlling_Formals : Boolean := False)
3429 procedure Conformance_Error (Msg : String; N : Node_Id := New_Id);
3430 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
3431 -- If Errmsg is True, then processing continues to post an error message
3432 -- for conformance error on given node. Two messages are output. The
3433 -- first message points to the previous declaration with a general "no
3434 -- conformance" message. The second is the detailed reason, supplied as
3435 -- Msg. The parameter N provide information for a possible & insertion
3436 -- in the message, and also provides the location for posting the
3437 -- message in the absence of a specified Err_Loc location.
3439 -----------------------
3440 -- Conformance_Error --
3441 -----------------------
3443 procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is
3450 if No (Err_Loc) then
3456 Error_Msg_Sloc := Sloc (Old_Id);
3459 when Type_Conformant =>
3460 Error_Msg_N -- CODEFIX
3461 ("not type conformant with declaration#!", Enode);
3463 when Mode_Conformant =>
3464 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3465 Error_Msg_N -- CODEFIX???
3466 ("not mode conformant with operation inherited#!",
3469 Error_Msg_N -- CODEFIX???
3470 ("not mode conformant with declaration#!", Enode);
3473 when Subtype_Conformant =>
3474 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3475 Error_Msg_N -- CODEFIX???
3476 ("not subtype conformant with operation inherited#!",
3479 Error_Msg_N -- CODEFIX???
3480 ("not subtype conformant with declaration#!", Enode);
3483 when Fully_Conformant =>
3484 if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then
3485 Error_Msg_N -- CODEFIX
3486 ("not fully conformant with operation inherited#!",
3489 Error_Msg_N -- CODEFIX
3490 ("not fully conformant with declaration#!", Enode);
3494 Error_Msg_NE (Msg, Enode, N);
3496 end Conformance_Error;
3500 Old_Type : constant Entity_Id := Etype (Old_Id);
3501 New_Type : constant Entity_Id := Etype (New_Id);
3502 Old_Formal : Entity_Id;
3503 New_Formal : Entity_Id;
3504 Access_Types_Match : Boolean;
3505 Old_Formal_Base : Entity_Id;
3506 New_Formal_Base : Entity_Id;
3508 -- Start of processing for Check_Conformance
3513 -- We need a special case for operators, since they don't appear
3516 if Ctype = Type_Conformant then
3517 if Ekind (New_Id) = E_Operator
3518 and then Operator_Matches_Spec (New_Id, Old_Id)
3524 -- If both are functions/operators, check return types conform
3526 if Old_Type /= Standard_Void_Type
3527 and then New_Type /= Standard_Void_Type
3530 -- If we are checking interface conformance we omit controlling
3531 -- arguments and result, because we are only checking the conformance
3532 -- of the remaining parameters.
3534 if Has_Controlling_Result (Old_Id)
3535 and then Has_Controlling_Result (New_Id)
3536 and then Skip_Controlling_Formals
3540 elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then
3541 Conformance_Error ("\return type does not match!", New_Id);
3545 -- Ada 2005 (AI-231): In case of anonymous access types check the
3546 -- null-exclusion and access-to-constant attributes match.
3548 if Ada_Version >= Ada_05
3549 and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type
3551 (Can_Never_Be_Null (Old_Type)
3552 /= Can_Never_Be_Null (New_Type)
3553 or else Is_Access_Constant (Etype (Old_Type))
3554 /= Is_Access_Constant (Etype (New_Type)))
3556 Conformance_Error ("\return type does not match!", New_Id);
3560 -- If either is a function/operator and the other isn't, error
3562 elsif Old_Type /= Standard_Void_Type
3563 or else New_Type /= Standard_Void_Type
3565 Conformance_Error ("\functions can only match functions!", New_Id);
3569 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3570 -- If this is a renaming as body, refine error message to indicate that
3571 -- the conflict is with the original declaration. If the entity is not
3572 -- frozen, the conventions don't have to match, the one of the renamed
3573 -- entity is inherited.
3575 if Ctype >= Subtype_Conformant then
3576 if Convention (Old_Id) /= Convention (New_Id) then
3578 if not Is_Frozen (New_Id) then
3581 elsif Present (Err_Loc)
3582 and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration
3583 and then Present (Corresponding_Spec (Err_Loc))
3585 Error_Msg_Name_1 := Chars (New_Id);
3587 Name_Ada + Convention_Id'Pos (Convention (New_Id));
3589 Conformance_Error ("\prior declaration for% has convention %!");
3592 Conformance_Error ("\calling conventions do not match!");
3597 elsif Is_Formal_Subprogram (Old_Id)
3598 or else Is_Formal_Subprogram (New_Id)
3600 Conformance_Error ("\formal subprograms not allowed!");
3605 -- Deal with parameters
3607 -- Note: we use the entity information, rather than going directly
3608 -- to the specification in the tree. This is not only simpler, but
3609 -- absolutely necessary for some cases of conformance tests between
3610 -- operators, where the declaration tree simply does not exist!
3612 Old_Formal := First_Formal (Old_Id);
3613 New_Formal := First_Formal (New_Id);
3614 while Present (Old_Formal) and then Present (New_Formal) loop
3615 if Is_Controlling_Formal (Old_Formal)
3616 and then Is_Controlling_Formal (New_Formal)
3617 and then Skip_Controlling_Formals
3619 -- The controlling formals will have different types when
3620 -- comparing an interface operation with its match, but both
3621 -- or neither must be access parameters.
3623 if Is_Access_Type (Etype (Old_Formal))
3625 Is_Access_Type (Etype (New_Formal))
3627 goto Skip_Controlling_Formal;
3630 ("\access parameter does not match!", New_Formal);
3634 if Ctype = Fully_Conformant then
3636 -- Names must match. Error message is more accurate if we do
3637 -- this before checking that the types of the formals match.
3639 if Chars (Old_Formal) /= Chars (New_Formal) then
3640 Conformance_Error ("\name & does not match!", New_Formal);
3642 -- Set error posted flag on new formal as well to stop
3643 -- junk cascaded messages in some cases.
3645 Set_Error_Posted (New_Formal);
3650 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3651 -- case occurs whenever a subprogram is being renamed and one of its
3652 -- parameters imposes a null exclusion. For example:
3654 -- type T is null record;
3655 -- type Acc_T is access T;
3656 -- subtype Acc_T_Sub is Acc_T;
3658 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3659 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3662 Old_Formal_Base := Etype (Old_Formal);
3663 New_Formal_Base := Etype (New_Formal);
3666 Old_Formal_Base := Get_Instance_Of (Old_Formal_Base);
3667 New_Formal_Base := Get_Instance_Of (New_Formal_Base);
3670 Access_Types_Match := Ada_Version >= Ada_05
3672 -- Ensure that this rule is only applied when New_Id is a
3673 -- renaming of Old_Id.
3675 and then Nkind (Parent (Parent (New_Id))) =
3676 N_Subprogram_Renaming_Declaration
3677 and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity
3678 and then Present (Entity (Name (Parent (Parent (New_Id)))))
3679 and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id
3681 -- Now handle the allowed access-type case
3683 and then Is_Access_Type (Old_Formal_Base)
3684 and then Is_Access_Type (New_Formal_Base)
3686 -- The type kinds must match. The only exception occurs with
3687 -- multiple generics of the form:
3690 -- type F is private; type A is private;
3691 -- type F_Ptr is access F; type A_Ptr is access A;
3692 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3693 -- package F_Pack is ... package A_Pack is
3694 -- package F_Inst is
3695 -- new F_Pack (A, A_Ptr, A_P);
3697 -- When checking for conformance between the parameters of A_P
3698 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3699 -- because the compiler has transformed A_Ptr into a subtype of
3700 -- F_Ptr. We catch this case in the code below.
3702 and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base)
3704 (Is_Generic_Type (Old_Formal_Base)
3705 and then Is_Generic_Type (New_Formal_Base)
3706 and then Is_Internal (New_Formal_Base)
3707 and then Etype (Etype (New_Formal_Base)) =
3709 and then Directly_Designated_Type (Old_Formal_Base) =
3710 Directly_Designated_Type (New_Formal_Base)
3711 and then ((Is_Itype (Old_Formal_Base)
3712 and then Can_Never_Be_Null (Old_Formal_Base))
3714 (Is_Itype (New_Formal_Base)
3715 and then Can_Never_Be_Null (New_Formal_Base)));
3717 -- Types must always match. In the visible part of an instance,
3718 -- usual overloading rules for dispatching operations apply, and
3719 -- we check base types (not the actual subtypes).
3721 if In_Instance_Visible_Part
3722 and then Is_Dispatching_Operation (New_Id)
3724 if not Conforming_Types
3725 (T1 => Base_Type (Etype (Old_Formal)),
3726 T2 => Base_Type (Etype (New_Formal)),
3728 Get_Inst => Get_Inst)
3729 and then not Access_Types_Match
3731 Conformance_Error ("\type of & does not match!", New_Formal);
3735 elsif not Conforming_Types
3736 (T1 => Old_Formal_Base,
3737 T2 => New_Formal_Base,
3739 Get_Inst => Get_Inst)
3740 and then not Access_Types_Match
3742 -- Don't give error message if old type is Any_Type. This test
3743 -- avoids some cascaded errors, e.g. in case of a bad spec.
3745 if Errmsg and then Old_Formal_Base = Any_Type then
3748 Conformance_Error ("\type of & does not match!", New_Formal);
3754 -- For mode conformance, mode must match
3756 if Ctype >= Mode_Conformant then
3757 if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then
3758 Conformance_Error ("\mode of & does not match!", New_Formal);
3761 -- Part of mode conformance for access types is having the same
3762 -- constant modifier.
3764 elsif Access_Types_Match
3765 and then Is_Access_Constant (Old_Formal_Base) /=
3766 Is_Access_Constant (New_Formal_Base)
3769 ("\constant modifier does not match!", New_Formal);
3774 if Ctype >= Subtype_Conformant then
3776 -- Ada 2005 (AI-231): In case of anonymous access types check
3777 -- the null-exclusion and access-to-constant attributes must
3780 if Ada_Version >= Ada_05
3781 and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type
3782 and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type
3784 (Can_Never_Be_Null (Old_Formal) /=
3785 Can_Never_Be_Null (New_Formal)
3787 Is_Access_Constant (Etype (Old_Formal)) /=
3788 Is_Access_Constant (Etype (New_Formal)))
3790 -- It is allowed to omit the null-exclusion in case of stream
3791 -- attribute subprograms. We recognize stream subprograms
3792 -- through their TSS-generated suffix.
3795 TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id);
3797 if TSS_Name /= TSS_Stream_Read
3798 and then TSS_Name /= TSS_Stream_Write
3799 and then TSS_Name /= TSS_Stream_Input
3800 and then TSS_Name /= TSS_Stream_Output
3803 ("\type of & does not match!", New_Formal);
3810 -- Full conformance checks
3812 if Ctype = Fully_Conformant then
3814 -- We have checked already that names match
3816 if Parameter_Mode (Old_Formal) = E_In_Parameter then
3818 -- Check default expressions for in parameters
3821 NewD : constant Boolean :=
3822 Present (Default_Value (New_Formal));
3823 OldD : constant Boolean :=
3824 Present (Default_Value (Old_Formal));
3826 if NewD or OldD then
3828 -- The old default value has been analyzed because the
3829 -- current full declaration will have frozen everything
3830 -- before. The new default value has not been analyzed,
3831 -- so analyze it now before we check for conformance.
3834 Push_Scope (New_Id);
3835 Preanalyze_Spec_Expression
3836 (Default_Value (New_Formal), Etype (New_Formal));
3840 if not (NewD and OldD)
3841 or else not Fully_Conformant_Expressions
3842 (Default_Value (Old_Formal),
3843 Default_Value (New_Formal))
3846 ("\default expression for & does not match!",
3855 -- A couple of special checks for Ada 83 mode. These checks are
3856 -- skipped if either entity is an operator in package Standard,
3857 -- or if either old or new instance is not from the source program.
3859 if Ada_Version = Ada_83
3860 and then Sloc (Old_Id) > Standard_Location
3861 and then Sloc (New_Id) > Standard_Location
3862 and then Comes_From_Source (Old_Id)
3863 and then Comes_From_Source (New_Id)
3866 Old_Param : constant Node_Id := Declaration_Node (Old_Formal);
3867 New_Param : constant Node_Id := Declaration_Node (New_Formal);
3870 -- Explicit IN must be present or absent in both cases. This
3871 -- test is required only in the full conformance case.
3873 if In_Present (Old_Param) /= In_Present (New_Param)
3874 and then Ctype = Fully_Conformant
3877 ("\(Ada 83) IN must appear in both declarations",
3882 -- Grouping (use of comma in param lists) must be the same
3883 -- This is where we catch a misconformance like:
3886 -- A : Integer; B : Integer
3888 -- which are represented identically in the tree except
3889 -- for the setting of the flags More_Ids and Prev_Ids.
3891 if More_Ids (Old_Param) /= More_Ids (New_Param)
3892 or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param)
3895 ("\grouping of & does not match!", New_Formal);
3901 -- This label is required when skipping controlling formals
3903 <<Skip_Controlling_Formal>>
3905 Next_Formal (Old_Formal);
3906 Next_Formal (New_Formal);
3909 if Present (Old_Formal) then
3910 Conformance_Error ("\too few parameters!");
3913 elsif Present (New_Formal) then
3914 Conformance_Error ("\too many parameters!", New_Formal);
3917 end Check_Conformance;
3919 -----------------------
3920 -- Check_Conventions --
3921 -----------------------
3923 procedure Check_Conventions (Typ : Entity_Id) is
3924 Ifaces_List : Elist_Id;
3926 procedure Check_Convention (Op : Entity_Id);
3927 -- Verify that the convention of inherited dispatching operation Op is
3928 -- consistent among all subprograms it overrides. In order to minimize
3929 -- the search, Search_From is utilized to designate a specific point in
3930 -- the list rather than iterating over the whole list once more.
3932 ----------------------
3933 -- Check_Convention --
3934 ----------------------
3936 procedure Check_Convention (Op : Entity_Id) is
3937 Iface_Elmt : Elmt_Id;
3938 Iface_Prim_Elmt : Elmt_Id;
3939 Iface_Prim : Entity_Id;
3942 Iface_Elmt := First_Elmt (Ifaces_List);
3943 while Present (Iface_Elmt) loop
3945 First_Elmt (Primitive_Operations (Node (Iface_Elmt)));
3946 while Present (Iface_Prim_Elmt) loop
3947 Iface_Prim := Node (Iface_Prim_Elmt);
3949 if Is_Interface_Conformant (Typ, Iface_Prim, Op)
3950 and then Convention (Iface_Prim) /= Convention (Op)
3953 ("inconsistent conventions in primitive operations", Typ);
3955 Error_Msg_Name_1 := Chars (Op);
3956 Error_Msg_Name_2 := Get_Convention_Name (Convention (Op));
3957 Error_Msg_Sloc := Sloc (Op);
3959 if Comes_From_Source (Op) then
3960 if not Is_Overriding_Operation (Op) then
3961 Error_Msg_N ("\\primitive % defined #", Typ);
3963 Error_Msg_N ("\\overriding operation % with " &
3964 "convention % defined #", Typ);
3967 else pragma Assert (Present (Alias (Op)));
3968 Error_Msg_Sloc := Sloc (Alias (Op));
3969 Error_Msg_N ("\\inherited operation % with " &
3970 "convention % defined #", Typ);
3973 Error_Msg_Name_1 := Chars (Op);
3975 Get_Convention_Name (Convention (Iface_Prim));
3976 Error_Msg_Sloc := Sloc (Iface_Prim);
3977 Error_Msg_N ("\\overridden operation % with " &
3978 "convention % defined #", Typ);
3980 -- Avoid cascading errors
3985 Next_Elmt (Iface_Prim_Elmt);
3988 Next_Elmt (Iface_Elmt);
3990 end Check_Convention;
3994 Prim_Op : Entity_Id;
3995 Prim_Op_Elmt : Elmt_Id;
3997 -- Start of processing for Check_Conventions
4000 if not Has_Interfaces (Typ) then
4004 Collect_Interfaces (Typ, Ifaces_List);
4006 -- The algorithm checks every overriding dispatching operation against
4007 -- all the corresponding overridden dispatching operations, detecting
4008 -- differences in conventions.
4010 Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ));
4011 while Present (Prim_Op_Elmt) loop
4012 Prim_Op := Node (Prim_Op_Elmt);
4014 -- A small optimization: skip the predefined dispatching operations
4015 -- since they always have the same convention.
4017 if not Is_Predefined_Dispatching_Operation (Prim_Op) then
4018 Check_Convention (Prim_Op);
4021 Next_Elmt (Prim_Op_Elmt);
4023 end Check_Conventions;
4025 ------------------------------
4026 -- Check_Delayed_Subprogram --
4027 ------------------------------
4029 procedure Check_Delayed_Subprogram (Designator : Entity_Id) is
4032 procedure Possible_Freeze (T : Entity_Id);
4033 -- T is the type of either a formal parameter or of the return type.
4034 -- If T is not yet frozen and needs a delayed freeze, then the
4035 -- subprogram itself must be delayed. If T is the limited view of an
4036 -- incomplete type the subprogram must be frozen as well, because
4037 -- T may depend on local types that have not been frozen yet.
4039 ---------------------
4040 -- Possible_Freeze --
4041 ---------------------
4043 procedure Possible_Freeze (T : Entity_Id) is
4045 if Has_Delayed_Freeze (T) and then not Is_Frozen (T) then
4046 Set_Has_Delayed_Freeze (Designator);
4048 elsif Is_Access_Type (T)
4049 and then Has_Delayed_Freeze (Designated_Type (T))
4050 and then not Is_Frozen (Designated_Type (T))
4052 Set_Has_Delayed_Freeze (Designator);
4054 elsif Ekind (T) = E_Incomplete_Type and then From_With_Type (T) then
4055 Set_Has_Delayed_Freeze (Designator);
4058 end Possible_Freeze;
4060 -- Start of processing for Check_Delayed_Subprogram
4063 -- Never need to freeze abstract subprogram
4065 if Ekind (Designator) /= E_Subprogram_Type
4066 and then Is_Abstract_Subprogram (Designator)
4070 -- Need delayed freeze if return type itself needs a delayed
4071 -- freeze and is not yet frozen.
4073 Possible_Freeze (Etype (Designator));
4074 Possible_Freeze (Base_Type (Etype (Designator))); -- needed ???
4076 -- Need delayed freeze if any of the formal types themselves need
4077 -- a delayed freeze and are not yet frozen.
4079 F := First_Formal (Designator);
4080 while Present (F) loop
4081 Possible_Freeze (Etype (F));
4082 Possible_Freeze (Base_Type (Etype (F))); -- needed ???
4087 -- Mark functions that return by reference. Note that it cannot be
4088 -- done for delayed_freeze subprograms because the underlying
4089 -- returned type may not be known yet (for private types)
4091 if not Has_Delayed_Freeze (Designator)
4092 and then Expander_Active
4095 Typ : constant Entity_Id := Etype (Designator);
4096 Utyp : constant Entity_Id := Underlying_Type (Typ);
4099 if Is_Inherently_Limited_Type (Typ) then
4100 Set_Returns_By_Ref (Designator);
4102 elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then
4103 Set_Returns_By_Ref (Designator);
4107 end Check_Delayed_Subprogram;
4109 ------------------------------------
4110 -- Check_Discriminant_Conformance --
4111 ------------------------------------
4113 procedure Check_Discriminant_Conformance
4118 Old_Discr : Entity_Id := First_Discriminant (Prev);
4119 New_Discr : Node_Id := First (Discriminant_Specifications (N));
4120 New_Discr_Id : Entity_Id;
4121 New_Discr_Type : Entity_Id;
4123 procedure Conformance_Error (Msg : String; N : Node_Id);
4124 -- Post error message for conformance error on given node. Two messages
4125 -- are output. The first points to the previous declaration with a
4126 -- general "no conformance" message. The second is the detailed reason,
4127 -- supplied as Msg. The parameter N provide information for a possible
4128 -- & insertion in the message.
4130 -----------------------
4131 -- Conformance_Error --
4132 -----------------------
4134 procedure Conformance_Error (Msg : String; N : Node_Id) is
4136 Error_Msg_Sloc := Sloc (Prev_Loc);
4137 Error_Msg_N -- CODEFIX
4138 ("not fully conformant with declaration#!", N);
4139 Error_Msg_NE (Msg, N, N);
4140 end Conformance_Error;
4142 -- Start of processing for Check_Discriminant_Conformance
4145 while Present (Old_Discr) and then Present (New_Discr) loop
4147 New_Discr_Id := Defining_Identifier (New_Discr);
4149 -- The subtype mark of the discriminant on the full type has not
4150 -- been analyzed so we do it here. For an access discriminant a new
4153 if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then
4155 Access_Definition (N, Discriminant_Type (New_Discr));
4158 Analyze (Discriminant_Type (New_Discr));
4159 New_Discr_Type := Etype (Discriminant_Type (New_Discr));
4161 -- Ada 2005: if the discriminant definition carries a null
4162 -- exclusion, create an itype to check properly for consistency
4163 -- with partial declaration.
4165 if Is_Access_Type (New_Discr_Type)
4166 and then Null_Exclusion_Present (New_Discr)
4169 Create_Null_Excluding_Itype
4170 (T => New_Discr_Type,
4171 Related_Nod => New_Discr,
4172 Scope_Id => Current_Scope);
4176 if not Conforming_Types
4177 (Etype (Old_Discr), New_Discr_Type, Fully_Conformant)
4179 Conformance_Error ("type of & does not match!", New_Discr_Id);
4182 -- Treat the new discriminant as an occurrence of the old one,
4183 -- for navigation purposes, and fill in some semantic
4184 -- information, for completeness.
4186 Generate_Reference (Old_Discr, New_Discr_Id, 'r');
4187 Set_Etype (New_Discr_Id, Etype (Old_Discr));
4188 Set_Scope (New_Discr_Id, Scope (Old_Discr));
4193 if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then
4194 Conformance_Error ("name & does not match!", New_Discr_Id);
4198 -- Default expressions must match
4201 NewD : constant Boolean :=
4202 Present (Expression (New_Discr));
4203 OldD : constant Boolean :=
4204 Present (Expression (Parent (Old_Discr)));
4207 if NewD or OldD then
4209 -- The old default value has been analyzed and expanded,
4210 -- because the current full declaration will have frozen
4211 -- everything before. The new default values have not been
4212 -- expanded, so expand now to check conformance.
4215 Preanalyze_Spec_Expression
4216 (Expression (New_Discr), New_Discr_Type);
4219 if not (NewD and OldD)
4220 or else not Fully_Conformant_Expressions
4221 (Expression (Parent (Old_Discr)),
4222 Expression (New_Discr))
4226 ("default expression for & does not match!",
4233 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4235 if Ada_Version = Ada_83 then
4237 Old_Disc : constant Node_Id := Declaration_Node (Old_Discr);
4240 -- Grouping (use of comma in param lists) must be the same
4241 -- This is where we catch a misconformance like:
4244 -- A : Integer; B : Integer
4246 -- which are represented identically in the tree except
4247 -- for the setting of the flags More_Ids and Prev_Ids.
4249 if More_Ids (Old_Disc) /= More_Ids (New_Discr)
4250 or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr)
4253 ("grouping of & does not match!", New_Discr_Id);
4259 Next_Discriminant (Old_Discr);
4263 if Present (Old_Discr) then
4264 Conformance_Error ("too few discriminants!", Defining_Identifier (N));
4267 elsif Present (New_Discr) then
4269 ("too many discriminants!", Defining_Identifier (New_Discr));
4272 end Check_Discriminant_Conformance;
4274 ----------------------------
4275 -- Check_Fully_Conformant --
4276 ----------------------------
4278 procedure Check_Fully_Conformant
4279 (New_Id : Entity_Id;
4281 Err_Loc : Node_Id := Empty)
4284 pragma Warnings (Off, Result);
4287 (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc);
4288 end Check_Fully_Conformant;
4290 ---------------------------
4291 -- Check_Mode_Conformant --
4292 ---------------------------
4294 procedure Check_Mode_Conformant
4295 (New_Id : Entity_Id;
4297 Err_Loc : Node_Id := Empty;
4298 Get_Inst : Boolean := False)
4301 pragma Warnings (Off, Result);
4304 (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst);
4305 end Check_Mode_Conformant;
4307 --------------------------------
4308 -- Check_Overriding_Indicator --
4309 --------------------------------
4311 procedure Check_Overriding_Indicator
4313 Overridden_Subp : Entity_Id;
4314 Is_Primitive : Boolean)
4320 -- No overriding indicator for literals
4322 if Ekind (Subp) = E_Enumeration_Literal then
4325 elsif Ekind (Subp) = E_Entry then
4326 Decl := Parent (Subp);
4328 -- No point in analyzing a malformed operator
4330 elsif Nkind (Subp) = N_Defining_Operator_Symbol
4331 and then Error_Posted (Subp)
4336 Decl := Unit_Declaration_Node (Subp);
4339 if Nkind_In (Decl, N_Subprogram_Body,
4340 N_Subprogram_Body_Stub,
4341 N_Subprogram_Declaration,
4342 N_Abstract_Subprogram_Declaration,
4343 N_Subprogram_Renaming_Declaration)
4345 Spec := Specification (Decl);
4347 elsif Nkind (Decl) = N_Entry_Declaration then
4354 -- The overriding operation is type conformant with the overridden one,
4355 -- but the names of the formals are not required to match. If the names
4356 -- appear permuted in the overriding operation, this is a possible
4357 -- source of confusion that is worth diagnosing. Controlling formals
4358 -- often carry names that reflect the type, and it is not worthwhile
4359 -- requiring that their names match.
4361 if Present (Overridden_Subp)
4362 and then Nkind (Subp) /= N_Defining_Operator_Symbol
4369 Form1 := First_Formal (Subp);
4370 Form2 := First_Formal (Overridden_Subp);
4372 -- If the overriding operation is a synchronized operation, skip
4373 -- the first parameter of the overridden operation, which is
4374 -- implicit in the new one. If the operation is declared in the
4375 -- body it is not primitive and all formals must match.
4377 if Is_Concurrent_Type (Scope (Subp))
4378 and then Is_Tagged_Type (Scope (Subp))
4379 and then not Has_Completion (Scope (Subp))
4381 Form2 := Next_Formal (Form2);
4384 if Present (Form1) then
4385 Form1 := Next_Formal (Form1);
4386 Form2 := Next_Formal (Form2);
4389 while Present (Form1) loop
4390 if not Is_Controlling_Formal (Form1)
4391 and then Present (Next_Formal (Form2))
4392 and then Chars (Form1) = Chars (Next_Formal (Form2))
4394 Error_Msg_Node_2 := Alias (Overridden_Subp);
4395 Error_Msg_Sloc := Sloc (Error_Msg_Node_2);
4396 Error_Msg_NE ("& does not match corresponding formal of&#",
4401 Next_Formal (Form1);
4402 Next_Formal (Form2);
4407 if Present (Overridden_Subp)
4408 and then not Is_Hidden (Overridden_Subp)
4410 if Must_Not_Override (Spec) then
4411 Error_Msg_Sloc := Sloc (Overridden_Subp);
4413 if Ekind (Subp) = E_Entry then
4415 ("entry & overrides inherited operation #", Spec, Subp);
4418 ("subprogram & overrides inherited operation #", Spec, Subp);
4421 elsif Is_Subprogram (Subp) then
4422 Set_Is_Overriding_Operation (Subp);
4425 -- If primitive flag is set or this is a protected operation, then
4426 -- the operation is overriding at the point of its declaration, so
4427 -- warn if necessary. Otherwise it may have been declared before the
4428 -- operation it overrides and no check is required.
4431 and then not Must_Override (Spec)
4432 and then (Is_Primitive
4433 or else Ekind (Scope (Subp)) = E_Protected_Type)
4435 Style.Missing_Overriding (Decl, Subp);
4438 -- If Subp is an operator, it may override a predefined operation, if
4439 -- it is defined in the same scope as the type to which it applies.
4440 -- In that case overridden_subp is empty because of our implicit
4441 -- representation for predefined operators. We have to check whether the
4442 -- signature of Subp matches that of a predefined operator. Note that
4443 -- first argument provides the name of the operator, and the second
4444 -- argument the signature that may match that of a standard operation.
4445 -- If the indicator is overriding, then the operator must match a
4446 -- predefined signature, because we know already that there is no
4447 -- explicit overridden operation.
4449 elsif Nkind (Subp) = N_Defining_Operator_Symbol then
4451 Typ : constant Entity_Id :=
4452 Base_Type (Etype (First_Formal (Subp)));
4454 Can_Override : constant Boolean :=
4455 Operator_Matches_Spec (Subp, Subp)
4456 and then Scope (Subp) = Scope (Typ)
4457 and then not Is_Class_Wide_Type (Typ);
4460 if Must_Not_Override (Spec) then
4462 -- If this is not a primitive or a protected subprogram, then
4463 -- "not overriding" is illegal.
4466 and then Ekind (Scope (Subp)) /= E_Protected_Type
4469 ("overriding indicator only allowed "
4470 & "if subprogram is primitive", Subp);
4472 elsif Can_Override then
4474 ("subprogram & overrides predefined operator ",
4478 elsif Must_Override (Spec) then
4479 if Is_Overriding_Operation (Subp) then
4480 Set_Is_Overriding_Operation (Subp);
4482 elsif not Can_Override then
4483 Error_Msg_NE ("subprogram & is not overriding", Spec, Subp);
4486 elsif not Error_Posted (Subp)
4487 and then Style_Check
4488 and then Can_Override
4490 not Is_Predefined_File_Name
4491 (Unit_File_Name (Get_Source_Unit (Subp)))
4493 Set_Is_Overriding_Operation (Subp);
4495 -- If style checks are enabled, indicate that the indicator is
4496 -- missing. However, at the point of declaration, the type of
4497 -- which this is a primitive operation may be private, in which
4498 -- case the indicator would be premature.
4500 if Has_Private_Declaration (Etype (Subp))
4501 or else Has_Private_Declaration (Etype (First_Formal (Subp)))
4505 Style.Missing_Overriding (Decl, Subp);
4510 elsif Must_Override (Spec) then
4511 if Ekind (Subp) = E_Entry then
4512 Error_Msg_NE ("entry & is not overriding", Spec, Subp);
4514 Error_Msg_NE ("subprogram & is not overriding", Spec, Subp);
4517 -- If the operation is marked "not overriding" and it's not primitive
4518 -- then an error is issued, unless this is an operation of a task or
4519 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4520 -- has been specified have already been checked above.
4522 elsif Must_Not_Override (Spec)
4523 and then not Is_Primitive
4524 and then Ekind (Subp) /= E_Entry
4525 and then Ekind (Scope (Subp)) /= E_Protected_Type
4528 ("overriding indicator only allowed if subprogram is primitive",
4532 end Check_Overriding_Indicator;
4538 -- Note: this procedure needs to know far too much about how the expander
4539 -- messes with exceptions. The use of the flag Exception_Junk and the
4540 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4541 -- works, but is not very clean. It would be better if the expansion
4542 -- routines would leave Original_Node working nicely, and we could use
4543 -- Original_Node here to ignore all the peculiar expander messing ???
4545 procedure Check_Returns
4549 Proc : Entity_Id := Empty)
4553 procedure Check_Statement_Sequence (L : List_Id);
4554 -- Internal recursive procedure to check a list of statements for proper
4555 -- termination by a return statement (or a transfer of control or a
4556 -- compound statement that is itself internally properly terminated).
4558 ------------------------------
4559 -- Check_Statement_Sequence --
4560 ------------------------------
4562 procedure Check_Statement_Sequence (L : List_Id) is
4567 Raise_Exception_Call : Boolean;
4568 -- Set True if statement sequence terminated by Raise_Exception call
4569 -- or a Reraise_Occurrence call.
4572 Raise_Exception_Call := False;
4574 -- Get last real statement
4576 Last_Stm := Last (L);
4578 -- Deal with digging out exception handler statement sequences that
4579 -- have been transformed by the local raise to goto optimization.
4580 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4581 -- optimization has occurred, we are looking at something like:
4584 -- original stmts in block
4588 -- goto L1; | omitted if No_Exception_Propagation
4593 -- goto L3; -- skip handler when exception not raised
4595 -- <<L1>> -- target label for local exception
4609 -- and what we have to do is to dig out the estmts1 and estmts2
4610 -- sequences (which were the original sequences of statements in
4611 -- the exception handlers) and check them.
4613 if Nkind (Last_Stm) = N_Label
4614 and then Exception_Junk (Last_Stm)
4620 exit when Nkind (Stm) /= N_Block_Statement;
4621 exit when not Exception_Junk (Stm);
4624 exit when Nkind (Stm) /= N_Label;
4625 exit when not Exception_Junk (Stm);
4626 Check_Statement_Sequence
4627 (Statements (Handled_Statement_Sequence (Next (Stm))));
4632 exit when Nkind (Stm) /= N_Goto_Statement;
4633 exit when not Exception_Junk (Stm);
4637 -- Don't count pragmas
4639 while Nkind (Last_Stm) = N_Pragma
4641 -- Don't count call to SS_Release (can happen after Raise_Exception)
4644 (Nkind (Last_Stm) = N_Procedure_Call_Statement
4646 Nkind (Name (Last_Stm)) = N_Identifier
4648 Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release))
4650 -- Don't count exception junk
4653 (Nkind_In (Last_Stm, N_Goto_Statement,
4655 N_Object_Declaration)
4656 and then Exception_Junk (Last_Stm))
4657 or else Nkind (Last_Stm) in N_Push_xxx_Label
4658 or else Nkind (Last_Stm) in N_Pop_xxx_Label
4663 -- Here we have the "real" last statement
4665 Kind := Nkind (Last_Stm);
4667 -- Transfer of control, OK. Note that in the No_Return procedure
4668 -- case, we already diagnosed any explicit return statements, so
4669 -- we can treat them as OK in this context.
4671 if Is_Transfer (Last_Stm) then
4674 -- Check cases of explicit non-indirect procedure calls
4676 elsif Kind = N_Procedure_Call_Statement
4677 and then Is_Entity_Name (Name (Last_Stm))
4679 -- Check call to Raise_Exception procedure which is treated
4680 -- specially, as is a call to Reraise_Occurrence.
4682 -- We suppress the warning in these cases since it is likely that
4683 -- the programmer really does not expect to deal with the case
4684 -- of Null_Occurrence, and thus would find a warning about a
4685 -- missing return curious, and raising Program_Error does not
4686 -- seem such a bad behavior if this does occur.
4688 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4689 -- behavior will be to raise Constraint_Error (see AI-329).
4691 if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception)
4693 Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence)
4695 Raise_Exception_Call := True;
4697 -- For Raise_Exception call, test first argument, if it is
4698 -- an attribute reference for a 'Identity call, then we know
4699 -- that the call cannot possibly return.
4702 Arg : constant Node_Id :=
4703 Original_Node (First_Actual (Last_Stm));
4705 if Nkind (Arg) = N_Attribute_Reference
4706 and then Attribute_Name (Arg) = Name_Identity
4713 -- If statement, need to look inside if there is an else and check
4714 -- each constituent statement sequence for proper termination.
4716 elsif Kind = N_If_Statement
4717 and then Present (Else_Statements (Last_Stm))
4719 Check_Statement_Sequence (Then_Statements (Last_Stm));
4720 Check_Statement_Sequence (Else_Statements (Last_Stm));
4722 if Present (Elsif_Parts (Last_Stm)) then
4724 Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm));
4727 while Present (Elsif_Part) loop
4728 Check_Statement_Sequence (Then_Statements (Elsif_Part));
4736 -- Case statement, check each case for proper termination
4738 elsif Kind = N_Case_Statement then
4742 Case_Alt := First_Non_Pragma (Alternatives (Last_Stm));
4743 while Present (Case_Alt) loop
4744 Check_Statement_Sequence (Statements (Case_Alt));
4745 Next_Non_Pragma (Case_Alt);
4751 -- Block statement, check its handled sequence of statements
4753 elsif Kind = N_Block_Statement then
4759 (Handled_Statement_Sequence (Last_Stm), Mode, Err1);
4768 -- Loop statement. If there is an iteration scheme, we can definitely
4769 -- fall out of the loop. Similarly if there is an exit statement, we
4770 -- can fall out. In either case we need a following return.
4772 elsif Kind = N_Loop_Statement then
4773 if Present (Iteration_Scheme (Last_Stm))
4774 or else Has_Exit (Entity (Identifier (Last_Stm)))
4778 -- A loop with no exit statement or iteration scheme is either
4779 -- an infinite loop, or it has some other exit (raise/return).
4780 -- In either case, no warning is required.
4786 -- Timed entry call, check entry call and delay alternatives
4788 -- Note: in expanded code, the timed entry call has been converted
4789 -- to a set of expanded statements on which the check will work
4790 -- correctly in any case.
4792 elsif Kind = N_Timed_Entry_Call then
4794 ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm);
4795 DCA : constant Node_Id := Delay_Alternative (Last_Stm);
4798 -- If statement sequence of entry call alternative is missing,
4799 -- then we can definitely fall through, and we post the error
4800 -- message on the entry call alternative itself.
4802 if No (Statements (ECA)) then
4805 -- If statement sequence of delay alternative is missing, then
4806 -- we can definitely fall through, and we post the error
4807 -- message on the delay alternative itself.
4809 -- Note: if both ECA and DCA are missing the return, then we
4810 -- post only one message, should be enough to fix the bugs.
4811 -- If not we will get a message next time on the DCA when the
4814 elsif No (Statements (DCA)) then
4817 -- Else check both statement sequences
4820 Check_Statement_Sequence (Statements (ECA));
4821 Check_Statement_Sequence (Statements (DCA));
4826 -- Conditional entry call, check entry call and else part
4828 -- Note: in expanded code, the conditional entry call has been
4829 -- converted to a set of expanded statements on which the check
4830 -- will work correctly in any case.
4832 elsif Kind = N_Conditional_Entry_Call then
4834 ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm);
4837 -- If statement sequence of entry call alternative is missing,
4838 -- then we can definitely fall through, and we post the error
4839 -- message on the entry call alternative itself.
4841 if No (Statements (ECA)) then
4844 -- Else check statement sequence and else part
4847 Check_Statement_Sequence (Statements (ECA));
4848 Check_Statement_Sequence (Else_Statements (Last_Stm));
4854 -- If we fall through, issue appropriate message
4857 if not Raise_Exception_Call then
4859 ("?RETURN statement missing following this statement!",
4862 ("\?Program_Error may be raised at run time!",
4866 -- Note: we set Err even though we have not issued a warning
4867 -- because we still have a case of a missing return. This is
4868 -- an extremely marginal case, probably will never be noticed
4869 -- but we might as well get it right.
4873 -- Otherwise we have the case of a procedure marked No_Return
4876 if not Raise_Exception_Call then
4878 ("?implied return after this statement " &
4879 "will raise Program_Error",
4882 ("\?procedure & is marked as No_Return!",
4887 RE : constant Node_Id :=
4888 Make_Raise_Program_Error (Sloc (Last_Stm),
4889 Reason => PE_Implicit_Return);
4891 Insert_After (Last_Stm, RE);
4895 end Check_Statement_Sequence;
4897 -- Start of processing for Check_Returns
4901 Check_Statement_Sequence (Statements (HSS));
4903 if Present (Exception_Handlers (HSS)) then
4904 Handler := First_Non_Pragma (Exception_Handlers (HSS));
4905 while Present (Handler) loop
4906 Check_Statement_Sequence (Statements (Handler));
4907 Next_Non_Pragma (Handler);
4912 ----------------------------
4913 -- Check_Subprogram_Order --
4914 ----------------------------
4916 procedure Check_Subprogram_Order (N : Node_Id) is
4918 function Subprogram_Name_Greater (S1, S2 : String) return Boolean;
4919 -- This is used to check if S1 > S2 in the sense required by this
4920 -- test, for example nameab < namec, but name2 < name10.
4922 -----------------------------
4923 -- Subprogram_Name_Greater --
4924 -----------------------------
4926 function Subprogram_Name_Greater (S1, S2 : String) return Boolean is
4931 -- Remove trailing numeric parts
4934 while S1 (L1) in '0' .. '9' loop
4939 while S2 (L2) in '0' .. '9' loop
4943 -- If non-numeric parts non-equal, that's decisive
4945 if S1 (S1'First .. L1) < S2 (S2'First .. L2) then
4948 elsif S1 (S1'First .. L1) > S2 (S2'First .. L2) then
4951 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4952 -- that a missing suffix is treated as numeric zero in this test.
4956 while L1 < S1'Last loop
4958 N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0');
4962 while L2 < S2'Last loop
4964 N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0');
4969 end Subprogram_Name_Greater;
4971 -- Start of processing for Check_Subprogram_Order
4974 -- Check body in alpha order if this is option
4977 and then Style_Check_Order_Subprograms
4978 and then Nkind (N) = N_Subprogram_Body
4979 and then Comes_From_Source (N)
4980 and then In_Extended_Main_Source_Unit (N)
4984 renames Scope_Stack.Table
4985 (Scope_Stack.Last).Last_Subprogram_Name;
4987 Body_Id : constant Entity_Id :=
4988 Defining_Entity (Specification (N));
4991 Get_Decoded_Name_String (Chars (Body_Id));
4994 if Subprogram_Name_Greater
4995 (LSN.all, Name_Buffer (1 .. Name_Len))
4997 Style.Subprogram_Not_In_Alpha_Order (Body_Id);
5003 LSN := new String'(Name_Buffer (1 .. Name_Len));
5006 end Check_Subprogram_Order;
5008 ------------------------------
5009 -- Check_Subtype_Conformant --
5010 ------------------------------
5012 procedure Check_Subtype_Conformant
5013 (New_Id : Entity_Id;
5015 Err_Loc : Node_Id := Empty;
5016 Skip_Controlling_Formals : Boolean := False)
5019 pragma Warnings (Off, Result);
5022 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
5023 Skip_Controlling_Formals => Skip_Controlling_Formals);
5024 end Check_Subtype_Conformant;
5026 ---------------------------
5027 -- Check_Type_Conformant --
5028 ---------------------------
5030 procedure Check_Type_Conformant
5031 (New_Id : Entity_Id;
5033 Err_Loc : Node_Id := Empty)
5036 pragma Warnings (Off, Result);
5039 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
5040 end Check_Type_Conformant;
5042 ----------------------
5043 -- Conforming_Types --
5044 ----------------------
5046 function Conforming_Types
5049 Ctype : Conformance_Type;
5050 Get_Inst : Boolean := False) return Boolean
5052 Type_1 : Entity_Id := T1;
5053 Type_2 : Entity_Id := T2;
5054 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
5056 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
5057 -- If neither T1 nor T2 are generic actual types, or if they are in
5058 -- different scopes (e.g. parent and child instances), then verify that
5059 -- the base types are equal. Otherwise T1 and T2 must be on the same
5060 -- subtype chain. The whole purpose of this procedure is to prevent
5061 -- spurious ambiguities in an instantiation that may arise if two
5062 -- distinct generic types are instantiated with the same actual.
5064 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
5065 -- An access parameter can designate an incomplete type. If the
5066 -- incomplete type is the limited view of a type from a limited_
5067 -- with_clause, check whether the non-limited view is available. If
5068 -- it is a (non-limited) incomplete type, get the full view.
5070 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
5071 -- Returns True if and only if either T1 denotes a limited view of T2
5072 -- or T2 denotes a limited view of T1. This can arise when the limited
5073 -- with view of a type is used in a subprogram declaration and the
5074 -- subprogram body is in the scope of a regular with clause for the
5075 -- same unit. In such a case, the two type entities can be considered
5076 -- identical for purposes of conformance checking.
5078 ----------------------
5079 -- Base_Types_Match --
5080 ----------------------
5082 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
5087 elsif Base_Type (T1) = Base_Type (T2) then
5089 -- The following is too permissive. A more precise test should
5090 -- check that the generic actual is an ancestor subtype of the
5093 return not Is_Generic_Actual_Type (T1)
5094 or else not Is_Generic_Actual_Type (T2)
5095 or else Scope (T1) /= Scope (T2);
5100 end Base_Types_Match;
5102 --------------------------
5103 -- Find_Designated_Type --
5104 --------------------------
5106 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
5110 Desig := Directly_Designated_Type (T);
5112 if Ekind (Desig) = E_Incomplete_Type then
5114 -- If regular incomplete type, get full view if available
5116 if Present (Full_View (Desig)) then
5117 Desig := Full_View (Desig);
5119 -- If limited view of a type, get non-limited view if available,
5120 -- and check again for a regular incomplete type.
5122 elsif Present (Non_Limited_View (Desig)) then
5123 Desig := Get_Full_View (Non_Limited_View (Desig));
5128 end Find_Designated_Type;
5130 -------------------------------
5131 -- Matches_Limited_With_View --
5132 -------------------------------
5134 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
5136 -- In some cases a type imported through a limited_with clause, and
5137 -- its nonlimited view are both visible, for example in an anonymous
5138 -- access-to-class-wide type in a formal. Both entities designate the
5141 if From_With_Type (T1)
5142 and then T2 = Available_View (T1)
5146 elsif From_With_Type (T2)
5147 and then T1 = Available_View (T2)
5154 end Matches_Limited_With_View;
5156 -- Start of processing for Conforming_Types
5159 -- The context is an instance association for a formal
5160 -- access-to-subprogram type; the formal parameter types require
5161 -- mapping because they may denote other formal parameters of the
5165 Type_1 := Get_Instance_Of (T1);
5166 Type_2 := Get_Instance_Of (T2);
5169 -- If one of the types is a view of the other introduced by a limited
5170 -- with clause, treat these as conforming for all purposes.
5172 if Matches_Limited_With_View (T1, T2) then
5175 elsif Base_Types_Match (Type_1, Type_2) then
5176 return Ctype <= Mode_Conformant
5177 or else Subtypes_Statically_Match (Type_1, Type_2);
5179 elsif Is_Incomplete_Or_Private_Type (Type_1)
5180 and then Present (Full_View (Type_1))
5181 and then Base_Types_Match (Full_View (Type_1), Type_2)
5183 return Ctype <= Mode_Conformant
5184 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
5186 elsif Ekind (Type_2) = E_Incomplete_Type
5187 and then Present (Full_View (Type_2))
5188 and then Base_Types_Match (Type_1, Full_View (Type_2))
5190 return Ctype <= Mode_Conformant
5191 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5193 elsif Is_Private_Type (Type_2)
5194 and then In_Instance
5195 and then Present (Full_View (Type_2))
5196 and then Base_Types_Match (Type_1, Full_View (Type_2))
5198 return Ctype <= Mode_Conformant
5199 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5202 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
5203 -- treated recursively because they carry a signature.
5205 Are_Anonymous_Access_To_Subprogram_Types :=
5206 Ekind (Type_1) = Ekind (Type_2)
5208 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
5210 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
5212 -- Test anonymous access type case. For this case, static subtype
5213 -- matching is required for mode conformance (RM 6.3.1(15)). We check
5214 -- the base types because we may have built internal subtype entities
5215 -- to handle null-excluding types (see Process_Formals).
5217 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
5219 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
5220 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
5223 Desig_1 : Entity_Id;
5224 Desig_2 : Entity_Id;
5227 -- In Ada2005, access constant indicators must match for
5228 -- subtype conformance.
5230 if Ada_Version >= Ada_05
5231 and then Ctype >= Subtype_Conformant
5233 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
5238 Desig_1 := Find_Designated_Type (Type_1);
5240 Desig_2 := Find_Designated_Type (Type_2);
5242 -- If the context is an instance association for a formal
5243 -- access-to-subprogram type; formal access parameter designated
5244 -- types require mapping because they may denote other formal
5245 -- parameters of the generic unit.
5248 Desig_1 := Get_Instance_Of (Desig_1);
5249 Desig_2 := Get_Instance_Of (Desig_2);
5252 -- It is possible for a Class_Wide_Type to be introduced for an
5253 -- incomplete type, in which case there is a separate class_ wide
5254 -- type for the full view. The types conform if their Etypes
5255 -- conform, i.e. one may be the full view of the other. This can
5256 -- only happen in the context of an access parameter, other uses
5257 -- of an incomplete Class_Wide_Type are illegal.
5259 if Is_Class_Wide_Type (Desig_1)
5260 and then Is_Class_Wide_Type (Desig_2)
5264 (Etype (Base_Type (Desig_1)),
5265 Etype (Base_Type (Desig_2)), Ctype);
5267 elsif Are_Anonymous_Access_To_Subprogram_Types then
5268 if Ada_Version < Ada_05 then
5269 return Ctype = Type_Conformant
5271 Subtypes_Statically_Match (Desig_1, Desig_2);
5273 -- We must check the conformance of the signatures themselves
5277 Conformant : Boolean;
5280 (Desig_1, Desig_2, Ctype, False, Conformant);
5286 return Base_Type (Desig_1) = Base_Type (Desig_2)
5287 and then (Ctype = Type_Conformant
5289 Subtypes_Statically_Match (Desig_1, Desig_2));
5293 -- Otherwise definitely no match
5296 if ((Ekind (Type_1) = E_Anonymous_Access_Type
5297 and then Is_Access_Type (Type_2))
5298 or else (Ekind (Type_2) = E_Anonymous_Access_Type
5299 and then Is_Access_Type (Type_1)))
5302 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
5304 May_Hide_Profile := True;
5309 end Conforming_Types;
5311 --------------------------
5312 -- Create_Extra_Formals --
5313 --------------------------
5315 procedure Create_Extra_Formals (E : Entity_Id) is
5317 First_Extra : Entity_Id := Empty;
5318 Last_Extra : Entity_Id;
5319 Formal_Type : Entity_Id;
5320 P_Formal : Entity_Id := Empty;
5322 function Add_Extra_Formal
5323 (Assoc_Entity : Entity_Id;
5326 Suffix : String) return Entity_Id;
5327 -- Add an extra formal to the current list of formals and extra formals.
5328 -- The extra formal is added to the end of the list of extra formals,
5329 -- and also returned as the result. These formals are always of mode IN.
5330 -- The new formal has the type Typ, is declared in Scope, and its name
5331 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5333 ----------------------
5334 -- Add_Extra_Formal --
5335 ----------------------
5337 function Add_Extra_Formal
5338 (Assoc_Entity : Entity_Id;
5341 Suffix : String) return Entity_Id
5343 EF : constant Entity_Id :=
5344 Make_Defining_Identifier (Sloc (Assoc_Entity),
5345 Chars => New_External_Name (Chars (Assoc_Entity),
5349 -- A little optimization. Never generate an extra formal for the
5350 -- _init operand of an initialization procedure, since it could
5353 if Chars (Formal) = Name_uInit then
5357 Set_Ekind (EF, E_In_Parameter);
5358 Set_Actual_Subtype (EF, Typ);
5359 Set_Etype (EF, Typ);
5360 Set_Scope (EF, Scope);
5361 Set_Mechanism (EF, Default_Mechanism);
5362 Set_Formal_Validity (EF);
5364 if No (First_Extra) then
5366 Set_Extra_Formals (Scope, First_Extra);
5369 if Present (Last_Extra) then
5370 Set_Extra_Formal (Last_Extra, EF);
5376 end Add_Extra_Formal;
5378 -- Start of processing for Create_Extra_Formals
5381 -- We never generate extra formals if expansion is not active
5382 -- because we don't need them unless we are generating code.
5384 if not Expander_Active then
5388 -- If this is a derived subprogram then the subtypes of the parent
5389 -- subprogram's formal parameters will be used to determine the need
5390 -- for extra formals.
5392 if Is_Overloadable (E) and then Present (Alias (E)) then
5393 P_Formal := First_Formal (Alias (E));
5396 Last_Extra := Empty;
5397 Formal := First_Formal (E);
5398 while Present (Formal) loop
5399 Last_Extra := Formal;
5400 Next_Formal (Formal);
5403 -- If Extra_formals were already created, don't do it again. This
5404 -- situation may arise for subprogram types created as part of
5405 -- dispatching calls (see Expand_Dispatching_Call)
5407 if Present (Last_Extra) and then
5408 Present (Extra_Formal (Last_Extra))
5413 -- If the subprogram is a predefined dispatching subprogram then don't
5414 -- generate any extra constrained or accessibility level formals. In
5415 -- general we suppress these for internal subprograms (by not calling
5416 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5417 -- generated stream attributes do get passed through because extra
5418 -- build-in-place formals are needed in some cases (limited 'Input).
5420 if Is_Predefined_Internal_Operation (E) then
5421 goto Test_For_BIP_Extras;
5424 Formal := First_Formal (E);
5425 while Present (Formal) loop
5427 -- Create extra formal for supporting the attribute 'Constrained.
5428 -- The case of a private type view without discriminants also
5429 -- requires the extra formal if the underlying type has defaulted
5432 if Ekind (Formal) /= E_In_Parameter then
5433 if Present (P_Formal) then
5434 Formal_Type := Etype (P_Formal);
5436 Formal_Type := Etype (Formal);
5439 -- Do not produce extra formals for Unchecked_Union parameters.
5440 -- Jump directly to the end of the loop.
5442 if Is_Unchecked_Union (Base_Type (Formal_Type)) then
5443 goto Skip_Extra_Formal_Generation;
5446 if not Has_Discriminants (Formal_Type)
5447 and then Ekind (Formal_Type) in Private_Kind
5448 and then Present (Underlying_Type (Formal_Type))
5450 Formal_Type := Underlying_Type (Formal_Type);
5453 if Has_Discriminants (Formal_Type)
5454 and then not Is_Constrained (Formal_Type)
5455 and then not Is_Indefinite_Subtype (Formal_Type)
5457 Set_Extra_Constrained
5458 (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "F"));
5462 -- Create extra formal for supporting accessibility checking. This
5463 -- is done for both anonymous access formals and formals of named
5464 -- access types that are marked as controlling formals. The latter
5465 -- case can occur when Expand_Dispatching_Call creates a subprogram
5466 -- type and substitutes the types of access-to-class-wide actuals
5467 -- for the anonymous access-to-specific-type of controlling formals.
5468 -- Base_Type is applied because in cases where there is a null
5469 -- exclusion the formal may have an access subtype.
5471 -- This is suppressed if we specifically suppress accessibility
5472 -- checks at the package level for either the subprogram, or the
5473 -- package in which it resides. However, we do not suppress it
5474 -- simply if the scope has accessibility checks suppressed, since
5475 -- this could cause trouble when clients are compiled with a
5476 -- different suppression setting. The explicit checks at the
5477 -- package level are safe from this point of view.
5479 if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type
5480 or else (Is_Controlling_Formal (Formal)
5481 and then Is_Access_Type (Base_Type (Etype (Formal)))))
5483 (Explicit_Suppress (E, Accessibility_Check)
5485 Explicit_Suppress (Scope (E), Accessibility_Check))
5488 or else Present (Extra_Accessibility (P_Formal)))
5490 Set_Extra_Accessibility
5491 (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "F"));
5494 -- This label is required when skipping extra formal generation for
5495 -- Unchecked_Union parameters.
5497 <<Skip_Extra_Formal_Generation>>
5499 if Present (P_Formal) then
5500 Next_Formal (P_Formal);
5503 Next_Formal (Formal);
5506 <<Test_For_BIP_Extras>>
5508 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5509 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5511 if Ada_Version >= Ada_05 and then Is_Build_In_Place_Function (E) then
5513 Result_Subt : constant Entity_Id := Etype (E);
5515 Discard : Entity_Id;
5516 pragma Warnings (Off, Discard);
5519 -- In the case of functions with unconstrained result subtypes,
5520 -- add a 3-state formal indicating whether the return object is
5521 -- allocated by the caller (0), or should be allocated by the
5522 -- callee on the secondary stack (1) or in the global heap (2).
5523 -- For the moment we just use Natural for the type of this formal.
5524 -- Note that this formal isn't usually needed in the case where
5525 -- the result subtype is constrained, but it is needed when the
5526 -- function has a tagged result, because generally such functions
5527 -- can be called in a dispatching context and such calls must be
5528 -- handled like calls to a class-wide function.
5530 if not Is_Constrained (Underlying_Type (Result_Subt))
5531 or else Is_Tagged_Type (Underlying_Type (Result_Subt))
5535 (E, Standard_Natural,
5536 E, BIP_Formal_Suffix (BIP_Alloc_Form));
5539 -- In the case of functions whose result type has controlled
5540 -- parts, we have an extra formal of type
5541 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5542 -- is, we are passing a pointer to a finalization list (which is
5543 -- itself a pointer). This extra formal is then passed along to
5544 -- Move_Final_List in case of successful completion of a return
5545 -- statement. We cannot pass an 'in out' parameter, because we
5546 -- need to update the finalization list during an abort-deferred
5547 -- region, rather than using copy-back after the function
5548 -- returns. This is true even if we are able to get away with
5549 -- having 'in out' parameters, which are normally illegal for
5550 -- functions. This formal is also needed when the function has
5553 if Needs_BIP_Final_List (E) then
5556 (E, RTE (RE_Finalizable_Ptr_Ptr),
5557 E, BIP_Formal_Suffix (BIP_Final_List));
5560 -- If the result type contains tasks, we have two extra formals:
5561 -- the master of the tasks to be created, and the caller's
5562 -- activation chain.
5564 if Has_Task (Result_Subt) then
5567 (E, RTE (RE_Master_Id),
5568 E, BIP_Formal_Suffix (BIP_Master));
5571 (E, RTE (RE_Activation_Chain_Access),
5572 E, BIP_Formal_Suffix (BIP_Activation_Chain));
5575 -- All build-in-place functions get an extra formal that will be
5576 -- passed the address of the return object within the caller.
5579 Formal_Type : constant Entity_Id :=
5581 (E_Anonymous_Access_Type, E,
5582 Scope_Id => Scope (E));
5584 Set_Directly_Designated_Type (Formal_Type, Result_Subt);
5585 Set_Etype (Formal_Type, Formal_Type);
5586 Set_Depends_On_Private
5587 (Formal_Type, Has_Private_Component (Formal_Type));
5588 Set_Is_Public (Formal_Type, Is_Public (Scope (Formal_Type)));
5589 Set_Is_Access_Constant (Formal_Type, False);
5591 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5592 -- the designated type comes from the limited view (for
5593 -- back-end purposes).
5595 Set_From_With_Type (Formal_Type, From_With_Type (Result_Subt));
5597 Layout_Type (Formal_Type);
5601 (E, Formal_Type, E, BIP_Formal_Suffix (BIP_Object_Access));
5605 end Create_Extra_Formals;
5607 -----------------------------
5608 -- Enter_Overloaded_Entity --
5609 -----------------------------
5611 procedure Enter_Overloaded_Entity (S : Entity_Id) is
5612 E : Entity_Id := Current_Entity_In_Scope (S);
5613 C_E : Entity_Id := Current_Entity (S);
5617 Set_Has_Homonym (E);
5618 Set_Has_Homonym (S);
5621 Set_Is_Immediately_Visible (S);
5622 Set_Scope (S, Current_Scope);
5624 -- Chain new entity if front of homonym in current scope, so that
5625 -- homonyms are contiguous.
5630 while Homonym (C_E) /= E loop
5631 C_E := Homonym (C_E);
5634 Set_Homonym (C_E, S);
5638 Set_Current_Entity (S);
5643 Append_Entity (S, Current_Scope);
5644 Set_Public_Status (S);
5646 if Debug_Flag_E then
5647 Write_Str ("New overloaded entity chain: ");
5648 Write_Name (Chars (S));
5651 while Present (E) loop
5652 Write_Str (" "); Write_Int (Int (E));
5659 -- Generate warning for hiding
5662 and then Comes_From_Source (S)
5663 and then In_Extended_Main_Source_Unit (S)
5670 -- Warn unless genuine overloading
5672 if (not Is_Overloadable (E) or else Subtype_Conformant (E, S))
5673 and then (Is_Immediately_Visible (E)
5675 Is_Potentially_Use_Visible (S))
5677 Error_Msg_Sloc := Sloc (E);
5678 Error_Msg_N ("declaration of & hides one#?", S);
5682 end Enter_Overloaded_Entity;
5684 -----------------------------
5685 -- Find_Corresponding_Spec --
5686 -----------------------------
5688 function Find_Corresponding_Spec
5690 Post_Error : Boolean := True) return Entity_Id
5692 Spec : constant Node_Id := Specification (N);
5693 Designator : constant Entity_Id := Defining_Entity (Spec);
5698 E := Current_Entity (Designator);
5699 while Present (E) loop
5701 -- We are looking for a matching spec. It must have the same scope,
5702 -- and the same name, and either be type conformant, or be the case
5703 -- of a library procedure spec and its body (which belong to one
5704 -- another regardless of whether they are type conformant or not).
5706 if Scope (E) = Current_Scope then
5707 if Current_Scope = Standard_Standard
5708 or else (Ekind (E) = Ekind (Designator)
5709 and then Type_Conformant (E, Designator))
5711 -- Within an instantiation, we know that spec and body are
5712 -- subtype conformant, because they were subtype conformant
5713 -- in the generic. We choose the subtype-conformant entity
5714 -- here as well, to resolve spurious ambiguities in the
5715 -- instance that were not present in the generic (i.e. when
5716 -- two different types are given the same actual). If we are
5717 -- looking for a spec to match a body, full conformance is
5721 Set_Convention (Designator, Convention (E));
5723 if Nkind (N) = N_Subprogram_Body
5724 and then Present (Homonym (E))
5725 and then not Fully_Conformant (E, Designator)
5729 elsif not Subtype_Conformant (E, Designator) then
5734 if not Has_Completion (E) then
5735 if Nkind (N) /= N_Subprogram_Body_Stub then
5736 Set_Corresponding_Spec (N, E);
5739 Set_Has_Completion (E);
5742 elsif Nkind (Parent (N)) = N_Subunit then
5744 -- If this is the proper body of a subunit, the completion
5745 -- flag is set when analyzing the stub.
5749 -- If E is an internal function with a controlling result
5750 -- that was created for an operation inherited by a null
5751 -- extension, it may be overridden by a body without a previous
5752 -- spec (one more reason why these should be shunned). In that
5753 -- case remove the generated body, because the current one is
5754 -- the explicit overriding.
5756 elsif Ekind (E) = E_Function
5757 and then Ada_Version >= Ada_05
5758 and then not Comes_From_Source (E)
5759 and then Has_Controlling_Result (E)
5760 and then Is_Null_Extension (Etype (E))
5761 and then Comes_From_Source (Spec)
5763 Set_Has_Completion (E, False);
5765 if Expander_Active then
5767 (Unit_Declaration_Node
5768 (Corresponding_Body (Unit_Declaration_Node (E))));
5771 -- If expansion is disabled, the wrapper function has not
5772 -- been generated, and this is the standard case of a late
5773 -- body overriding an inherited operation.
5779 -- If the body already exists, then this is an error unless
5780 -- the previous declaration is the implicit declaration of a
5781 -- derived subprogram, or this is a spurious overloading in an
5784 elsif No (Alias (E))
5785 and then not Is_Intrinsic_Subprogram (E)
5786 and then not In_Instance
5789 Error_Msg_Sloc := Sloc (E);
5791 if Is_Imported (E) then
5793 ("body not allowed for imported subprogram & declared#",
5796 Error_Msg_NE ("duplicate body for & declared#", N, E);
5800 -- Child units cannot be overloaded, so a conformance mismatch
5801 -- between body and a previous spec is an error.
5803 elsif Is_Child_Unit (E)
5805 Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body
5807 Nkind (Parent (Unit_Declaration_Node (Designator))) =
5812 ("body of child unit does not match previous declaration", N);
5820 -- On exit, we know that no previous declaration of subprogram exists
5823 end Find_Corresponding_Spec;
5825 ----------------------
5826 -- Fully_Conformant --
5827 ----------------------
5829 function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is
5832 Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result);
5834 end Fully_Conformant;
5836 ----------------------------------
5837 -- Fully_Conformant_Expressions --
5838 ----------------------------------
5840 function Fully_Conformant_Expressions
5841 (Given_E1 : Node_Id;
5842 Given_E2 : Node_Id) return Boolean
5844 E1 : constant Node_Id := Original_Node (Given_E1);
5845 E2 : constant Node_Id := Original_Node (Given_E2);
5846 -- We always test conformance on original nodes, since it is possible
5847 -- for analysis and/or expansion to make things look as though they
5848 -- conform when they do not, e.g. by converting 1+2 into 3.
5850 function FCE (Given_E1, Given_E2 : Node_Id) return Boolean
5851 renames Fully_Conformant_Expressions;
5853 function FCL (L1, L2 : List_Id) return Boolean;
5854 -- Compare elements of two lists for conformance. Elements have to
5855 -- be conformant, and actuals inserted as default parameters do not
5856 -- match explicit actuals with the same value.
5858 function FCO (Op_Node, Call_Node : Node_Id) return Boolean;
5859 -- Compare an operator node with a function call
5865 function FCL (L1, L2 : List_Id) return Boolean is
5869 if L1 = No_List then
5875 if L2 = No_List then
5881 -- Compare two lists, skipping rewrite insertions (we want to
5882 -- compare the original trees, not the expanded versions!)
5885 if Is_Rewrite_Insertion (N1) then
5887 elsif Is_Rewrite_Insertion (N2) then
5893 elsif not FCE (N1, N2) then
5906 function FCO (Op_Node, Call_Node : Node_Id) return Boolean is
5907 Actuals : constant List_Id := Parameter_Associations (Call_Node);
5912 or else Entity (Op_Node) /= Entity (Name (Call_Node))
5917 Act := First (Actuals);
5919 if Nkind (Op_Node) in N_Binary_Op then
5920 if not FCE (Left_Opnd (Op_Node), Act) then
5927 return Present (Act)
5928 and then FCE (Right_Opnd (Op_Node), Act)
5929 and then No (Next (Act));
5933 -- Start of processing for Fully_Conformant_Expressions
5936 -- Non-conformant if paren count does not match. Note: if some idiot
5937 -- complains that we don't do this right for more than 3 levels of
5938 -- parentheses, they will be treated with the respect they deserve!
5940 if Paren_Count (E1) /= Paren_Count (E2) then
5943 -- If same entities are referenced, then they are conformant even if
5944 -- they have different forms (RM 8.3.1(19-20)).
5946 elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then
5947 if Present (Entity (E1)) then
5948 return Entity (E1) = Entity (E2)
5949 or else (Chars (Entity (E1)) = Chars (Entity (E2))
5950 and then Ekind (Entity (E1)) = E_Discriminant
5951 and then Ekind (Entity (E2)) = E_In_Parameter);
5953 elsif Nkind (E1) = N_Expanded_Name
5954 and then Nkind (E2) = N_Expanded_Name
5955 and then Nkind (Selector_Name (E1)) = N_Character_Literal
5956 and then Nkind (Selector_Name (E2)) = N_Character_Literal
5958 return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2));
5961 -- Identifiers in component associations don't always have
5962 -- entities, but their names must conform.
5964 return Nkind (E1) = N_Identifier
5965 and then Nkind (E2) = N_Identifier
5966 and then Chars (E1) = Chars (E2);
5969 elsif Nkind (E1) = N_Character_Literal
5970 and then Nkind (E2) = N_Expanded_Name
5972 return Nkind (Selector_Name (E2)) = N_Character_Literal
5973 and then Chars (E1) = Chars (Selector_Name (E2));
5975 elsif Nkind (E2) = N_Character_Literal
5976 and then Nkind (E1) = N_Expanded_Name
5978 return Nkind (Selector_Name (E1)) = N_Character_Literal
5979 and then Chars (E2) = Chars (Selector_Name (E1));
5981 elsif Nkind (E1) in N_Op
5982 and then Nkind (E2) = N_Function_Call
5984 return FCO (E1, E2);
5986 elsif Nkind (E2) in N_Op
5987 and then Nkind (E1) = N_Function_Call
5989 return FCO (E2, E1);
5991 -- Otherwise we must have the same syntactic entity
5993 elsif Nkind (E1) /= Nkind (E2) then
5996 -- At this point, we specialize by node type
6003 FCL (Expressions (E1), Expressions (E2))
6004 and then FCL (Component_Associations (E1),
6005 Component_Associations (E2));
6008 if Nkind (Expression (E1)) = N_Qualified_Expression
6010 Nkind (Expression (E2)) = N_Qualified_Expression
6012 return FCE (Expression (E1), Expression (E2));
6014 -- Check that the subtype marks and any constraints
6019 Indic1 : constant Node_Id := Expression (E1);
6020 Indic2 : constant Node_Id := Expression (E2);
6025 if Nkind (Indic1) /= N_Subtype_Indication then
6027 Nkind (Indic2) /= N_Subtype_Indication
6028 and then Entity (Indic1) = Entity (Indic2);
6030 elsif Nkind (Indic2) /= N_Subtype_Indication then
6032 Nkind (Indic1) /= N_Subtype_Indication
6033 and then Entity (Indic1) = Entity (Indic2);
6036 if Entity (Subtype_Mark (Indic1)) /=
6037 Entity (Subtype_Mark (Indic2))
6042 Elt1 := First (Constraints (Constraint (Indic1)));
6043 Elt2 := First (Constraints (Constraint (Indic2)));
6044 while Present (Elt1) and then Present (Elt2) loop
6045 if not FCE (Elt1, Elt2) then
6058 when N_Attribute_Reference =>
6060 Attribute_Name (E1) = Attribute_Name (E2)
6061 and then FCL (Expressions (E1), Expressions (E2));
6065 Entity (E1) = Entity (E2)
6066 and then FCE (Left_Opnd (E1), Left_Opnd (E2))
6067 and then FCE (Right_Opnd (E1), Right_Opnd (E2));
6069 when N_Short_Circuit | N_Membership_Test =>
6071 FCE (Left_Opnd (E1), Left_Opnd (E2))
6073 FCE (Right_Opnd (E1), Right_Opnd (E2));
6075 when N_Character_Literal =>
6077 Char_Literal_Value (E1) = Char_Literal_Value (E2);
6079 when N_Component_Association =>
6081 FCL (Choices (E1), Choices (E2))
6082 and then FCE (Expression (E1), Expression (E2));
6084 when N_Conditional_Expression =>
6086 FCL (Expressions (E1), Expressions (E2));
6088 when N_Explicit_Dereference =>
6090 FCE (Prefix (E1), Prefix (E2));
6092 when N_Extension_Aggregate =>
6094 FCL (Expressions (E1), Expressions (E2))
6095 and then Null_Record_Present (E1) =
6096 Null_Record_Present (E2)
6097 and then FCL (Component_Associations (E1),
6098 Component_Associations (E2));
6100 when N_Function_Call =>
6102 FCE (Name (E1), Name (E2))
6103 and then FCL (Parameter_Associations (E1),
6104 Parameter_Associations (E2));
6106 when N_Indexed_Component =>
6108 FCE (Prefix (E1), Prefix (E2))
6109 and then FCL (Expressions (E1), Expressions (E2));
6111 when N_Integer_Literal =>
6112 return (Intval (E1) = Intval (E2));
6117 when N_Operator_Symbol =>
6119 Chars (E1) = Chars (E2);
6121 when N_Others_Choice =>
6124 when N_Parameter_Association =>
6126 Chars (Selector_Name (E1)) = Chars (Selector_Name (E2))
6127 and then FCE (Explicit_Actual_Parameter (E1),
6128 Explicit_Actual_Parameter (E2));
6130 when N_Qualified_Expression =>
6132 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6133 and then FCE (Expression (E1), Expression (E2));
6137 FCE (Low_Bound (E1), Low_Bound (E2))
6138 and then FCE (High_Bound (E1), High_Bound (E2));
6140 when N_Real_Literal =>
6141 return (Realval (E1) = Realval (E2));
6143 when N_Selected_Component =>
6145 FCE (Prefix (E1), Prefix (E2))
6146 and then FCE (Selector_Name (E1), Selector_Name (E2));
6150 FCE (Prefix (E1), Prefix (E2))
6151 and then FCE (Discrete_Range (E1), Discrete_Range (E2));
6153 when N_String_Literal =>
6155 S1 : constant String_Id := Strval (E1);
6156 S2 : constant String_Id := Strval (E2);
6157 L1 : constant Nat := String_Length (S1);
6158 L2 : constant Nat := String_Length (S2);
6165 for J in 1 .. L1 loop
6166 if Get_String_Char (S1, J) /=
6167 Get_String_Char (S2, J)
6177 when N_Type_Conversion =>
6179 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6180 and then FCE (Expression (E1), Expression (E2));
6184 Entity (E1) = Entity (E2)
6185 and then FCE (Right_Opnd (E1), Right_Opnd (E2));
6187 when N_Unchecked_Type_Conversion =>
6189 FCE (Subtype_Mark (E1), Subtype_Mark (E2))
6190 and then FCE (Expression (E1), Expression (E2));
6192 -- All other node types cannot appear in this context. Strictly
6193 -- we should raise a fatal internal error. Instead we just ignore
6194 -- the nodes. This means that if anyone makes a mistake in the
6195 -- expander and mucks an expression tree irretrievably, the
6196 -- result will be a failure to detect a (probably very obscure)
6197 -- case of non-conformance, which is better than bombing on some
6198 -- case where two expressions do in fact conform.
6205 end Fully_Conformant_Expressions;
6207 ----------------------------------------
6208 -- Fully_Conformant_Discrete_Subtypes --
6209 ----------------------------------------
6211 function Fully_Conformant_Discrete_Subtypes
6212 (Given_S1 : Node_Id;
6213 Given_S2 : Node_Id) return Boolean
6215 S1 : constant Node_Id := Original_Node (Given_S1);
6216 S2 : constant Node_Id := Original_Node (Given_S2);
6218 function Conforming_Bounds (B1, B2 : Node_Id) return Boolean;
6219 -- Special-case for a bound given by a discriminant, which in the body
6220 -- is replaced with the discriminal of the enclosing type.
6222 function Conforming_Ranges (R1, R2 : Node_Id) return Boolean;
6223 -- Check both bounds
6225 -----------------------
6226 -- Conforming_Bounds --
6227 -----------------------
6229 function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is
6231 if Is_Entity_Name (B1)
6232 and then Is_Entity_Name (B2)
6233 and then Ekind (Entity (B1)) = E_Discriminant
6235 return Chars (B1) = Chars (B2);
6238 return Fully_Conformant_Expressions (B1, B2);
6240 end Conforming_Bounds;
6242 -----------------------
6243 -- Conforming_Ranges --
6244 -----------------------
6246 function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is
6249 Conforming_Bounds (Low_Bound (R1), Low_Bound (R2))
6251 Conforming_Bounds (High_Bound (R1), High_Bound (R2));
6252 end Conforming_Ranges;
6254 -- Start of processing for Fully_Conformant_Discrete_Subtypes
6257 if Nkind (S1) /= Nkind (S2) then
6260 elsif Is_Entity_Name (S1) then
6261 return Entity (S1) = Entity (S2);
6263 elsif Nkind (S1) = N_Range then
6264 return Conforming_Ranges (S1, S2);
6266 elsif Nkind (S1) = N_Subtype_Indication then
6268 Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2))
6271 (Range_Expression (Constraint (S1)),
6272 Range_Expression (Constraint (S2)));
6276 end Fully_Conformant_Discrete_Subtypes;
6278 --------------------
6279 -- Install_Entity --
6280 --------------------
6282 procedure Install_Entity (E : Entity_Id) is
6283 Prev : constant Entity_Id := Current_Entity (E);
6285 Set_Is_Immediately_Visible (E);
6286 Set_Current_Entity (E);
6287 Set_Homonym (E, Prev);
6290 ---------------------
6291 -- Install_Formals --
6292 ---------------------
6294 procedure Install_Formals (Id : Entity_Id) is
6297 F := First_Formal (Id);
6298 while Present (F) loop
6302 end Install_Formals;
6304 -----------------------------
6305 -- Is_Interface_Conformant --
6306 -----------------------------
6308 function Is_Interface_Conformant
6309 (Tagged_Type : Entity_Id;
6310 Iface_Prim : Entity_Id;
6311 Prim : Entity_Id) return Boolean
6313 Iface : constant Entity_Id := Find_Dispatching_Type (Iface_Prim);
6314 Typ : constant Entity_Id := Find_Dispatching_Type (Prim);
6317 pragma Assert (Is_Subprogram (Iface_Prim)
6318 and then Is_Subprogram (Prim)
6319 and then Is_Dispatching_Operation (Iface_Prim)
6320 and then Is_Dispatching_Operation (Prim));
6322 pragma Assert (Is_Interface (Iface)
6323 or else (Present (Alias (Iface_Prim))
6326 (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)))));
6328 if Prim = Iface_Prim
6329 or else not Is_Subprogram (Prim)
6330 or else Ekind (Prim) /= Ekind (Iface_Prim)
6331 or else not Is_Dispatching_Operation (Prim)
6332 or else Scope (Prim) /= Scope (Tagged_Type)
6334 or else Base_Type (Typ) /= Tagged_Type
6335 or else not Primitive_Names_Match (Iface_Prim, Prim)
6339 -- Case of a procedure, or a function that does not have a controlling
6340 -- result (I or access I).
6342 elsif Ekind (Iface_Prim) = E_Procedure
6343 or else Etype (Prim) = Etype (Iface_Prim)
6344 or else not Has_Controlling_Result (Prim)
6346 return Type_Conformant (Prim, Iface_Prim,
6347 Skip_Controlling_Formals => True);
6349 -- Case of a function returning an interface, or an access to one.
6350 -- Check that the return types correspond.
6352 elsif Implements_Interface (Typ, Iface) then
6353 if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type)
6355 (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type)
6360 Type_Conformant (Prim, Iface_Prim,
6361 Skip_Controlling_Formals => True);
6367 end Is_Interface_Conformant;
6369 ---------------------------------
6370 -- Is_Non_Overriding_Operation --
6371 ---------------------------------
6373 function Is_Non_Overriding_Operation
6374 (Prev_E : Entity_Id;
6375 New_E : Entity_Id) return Boolean
6379 G_Typ : Entity_Id := Empty;
6381 function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id;
6382 -- If F_Type is a derived type associated with a generic actual subtype,
6383 -- then return its Generic_Parent_Type attribute, else return Empty.
6385 function Types_Correspond
6386 (P_Type : Entity_Id;
6387 N_Type : Entity_Id) return Boolean;
6388 -- Returns true if and only if the types (or designated types in the
6389 -- case of anonymous access types) are the same or N_Type is derived
6390 -- directly or indirectly from P_Type.
6392 -----------------------------
6393 -- Get_Generic_Parent_Type --
6394 -----------------------------
6396 function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is
6401 if Is_Derived_Type (F_Typ)
6402 and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration
6404 -- The tree must be traversed to determine the parent subtype in
6405 -- the generic unit, which unfortunately isn't always available
6406 -- via semantic attributes. ??? (Note: The use of Original_Node
6407 -- is needed for cases where a full derived type has been
6410 Indic := Subtype_Indication
6411 (Type_Definition (Original_Node (Parent (F_Typ))));
6413 if Nkind (Indic) = N_Subtype_Indication then
6414 G_Typ := Entity (Subtype_Mark (Indic));
6416 G_Typ := Entity (Indic);
6419 if Nkind (Parent (G_Typ)) = N_Subtype_Declaration
6420 and then Present (Generic_Parent_Type (Parent (G_Typ)))
6422 return Generic_Parent_Type (Parent (G_Typ));
6427 end Get_Generic_Parent_Type;
6429 ----------------------
6430 -- Types_Correspond --
6431 ----------------------
6433 function Types_Correspond
6434 (P_Type : Entity_Id;
6435 N_Type : Entity_Id) return Boolean
6437 Prev_Type : Entity_Id := Base_Type (P_Type);
6438 New_Type : Entity_Id := Base_Type (N_Type);
6441 if Ekind (Prev_Type) = E_Anonymous_Access_Type then
6442 Prev_Type := Designated_Type (Prev_Type);
6445 if Ekind (New_Type) = E_Anonymous_Access_Type then
6446 New_Type := Designated_Type (New_Type);
6449 if Prev_Type = New_Type then
6452 elsif not Is_Class_Wide_Type (New_Type) then
6453 while Etype (New_Type) /= New_Type loop
6454 New_Type := Etype (New_Type);
6455 if New_Type = Prev_Type then
6461 end Types_Correspond;
6463 -- Start of processing for Is_Non_Overriding_Operation
6466 -- In the case where both operations are implicit derived subprograms
6467 -- then neither overrides the other. This can only occur in certain
6468 -- obscure cases (e.g., derivation from homographs created in a generic
6471 if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then
6474 elsif Ekind (Current_Scope) = E_Package
6475 and then Is_Generic_Instance (Current_Scope)
6476 and then In_Private_Part (Current_Scope)
6477 and then Comes_From_Source (New_E)
6479 -- We examine the formals and result subtype of the inherited
6480 -- operation, to determine whether their type is derived from (the
6481 -- instance of) a generic type.
6483 Formal := First_Formal (Prev_E);
6485 while Present (Formal) loop
6486 F_Typ := Base_Type (Etype (Formal));
6488 if Ekind (F_Typ) = E_Anonymous_Access_Type then
6489 F_Typ := Designated_Type (F_Typ);
6492 G_Typ := Get_Generic_Parent_Type (F_Typ);
6494 Next_Formal (Formal);
6497 if No (G_Typ) and then Ekind (Prev_E) = E_Function then
6498 G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E)));
6505 -- If the generic type is a private type, then the original operation
6506 -- was not overriding in the generic, because there was no primitive
6507 -- operation to override.
6509 if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration
6510 and then Nkind (Formal_Type_Definition (Parent (G_Typ))) =
6511 N_Formal_Private_Type_Definition
6515 -- The generic parent type is the ancestor of a formal derived
6516 -- type declaration. We need to check whether it has a primitive
6517 -- operation that should be overridden by New_E in the generic.
6521 P_Formal : Entity_Id;
6522 N_Formal : Entity_Id;
6526 Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ));
6529 while Present (Prim_Elt) loop
6530 P_Prim := Node (Prim_Elt);
6532 if Chars (P_Prim) = Chars (New_E)
6533 and then Ekind (P_Prim) = Ekind (New_E)
6535 P_Formal := First_Formal (P_Prim);
6536 N_Formal := First_Formal (New_E);
6537 while Present (P_Formal) and then Present (N_Formal) loop
6538 P_Typ := Etype (P_Formal);
6539 N_Typ := Etype (N_Formal);
6541 if not Types_Correspond (P_Typ, N_Typ) then
6545 Next_Entity (P_Formal);
6546 Next_Entity (N_Formal);
6549 -- Found a matching primitive operation belonging to the
6550 -- formal ancestor type, so the new subprogram is
6554 and then No (N_Formal)
6555 and then (Ekind (New_E) /= E_Function
6558 (Etype (P_Prim), Etype (New_E)))
6564 Next_Elmt (Prim_Elt);
6567 -- If no match found, then the new subprogram does not
6568 -- override in the generic (nor in the instance).
6576 end Is_Non_Overriding_Operation;
6578 ------------------------------
6579 -- Make_Inequality_Operator --
6580 ------------------------------
6582 -- S is the defining identifier of an equality operator. We build a
6583 -- subprogram declaration with the right signature. This operation is
6584 -- intrinsic, because it is always expanded as the negation of the
6585 -- call to the equality function.
6587 procedure Make_Inequality_Operator (S : Entity_Id) is
6588 Loc : constant Source_Ptr := Sloc (S);
6591 Op_Name : Entity_Id;
6593 FF : constant Entity_Id := First_Formal (S);
6594 NF : constant Entity_Id := Next_Formal (FF);
6597 -- Check that equality was properly defined, ignore call if not
6604 A : constant Entity_Id :=
6605 Make_Defining_Identifier (Sloc (FF),
6606 Chars => Chars (FF));
6608 B : constant Entity_Id :=
6609 Make_Defining_Identifier (Sloc (NF),
6610 Chars => Chars (NF));
6613 Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne);
6615 Formals := New_List (
6616 Make_Parameter_Specification (Loc,
6617 Defining_Identifier => A,
6619 New_Reference_To (Etype (First_Formal (S)),
6620 Sloc (Etype (First_Formal (S))))),
6622 Make_Parameter_Specification (Loc,
6623 Defining_Identifier => B,
6625 New_Reference_To (Etype (Next_Formal (First_Formal (S))),
6626 Sloc (Etype (Next_Formal (First_Formal (S)))))));
6629 Make_Subprogram_Declaration (Loc,
6631 Make_Function_Specification (Loc,
6632 Defining_Unit_Name => Op_Name,
6633 Parameter_Specifications => Formals,
6634 Result_Definition =>
6635 New_Reference_To (Standard_Boolean, Loc)));
6637 -- Insert inequality right after equality if it is explicit or after
6638 -- the derived type when implicit. These entities are created only
6639 -- for visibility purposes, and eventually replaced in the course of
6640 -- expansion, so they do not need to be attached to the tree and seen
6641 -- by the back-end. Keeping them internal also avoids spurious
6642 -- freezing problems. The declaration is inserted in the tree for
6643 -- analysis, and removed afterwards. If the equality operator comes
6644 -- from an explicit declaration, attach the inequality immediately
6645 -- after. Else the equality is inherited from a derived type
6646 -- declaration, so insert inequality after that declaration.
6648 if No (Alias (S)) then
6649 Insert_After (Unit_Declaration_Node (S), Decl);
6650 elsif Is_List_Member (Parent (S)) then
6651 Insert_After (Parent (S), Decl);
6653 Insert_After (Parent (Etype (First_Formal (S))), Decl);
6656 Mark_Rewrite_Insertion (Decl);
6657 Set_Is_Intrinsic_Subprogram (Op_Name);
6660 Set_Has_Completion (Op_Name);
6661 Set_Corresponding_Equality (Op_Name, S);
6662 Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S));
6664 end Make_Inequality_Operator;
6666 ----------------------
6667 -- May_Need_Actuals --
6668 ----------------------
6670 procedure May_Need_Actuals (Fun : Entity_Id) is
6675 F := First_Formal (Fun);
6677 while Present (F) loop
6678 if No (Default_Value (F)) then
6686 Set_Needs_No_Actuals (Fun, B);
6687 end May_Need_Actuals;
6689 ---------------------
6690 -- Mode_Conformant --
6691 ---------------------
6693 function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is
6696 Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result);
6698 end Mode_Conformant;
6700 ---------------------------
6701 -- New_Overloaded_Entity --
6702 ---------------------------
6704 procedure New_Overloaded_Entity
6706 Derived_Type : Entity_Id := Empty)
6708 Overridden_Subp : Entity_Id := Empty;
6709 -- Set if the current scope has an operation that is type-conformant
6710 -- with S, and becomes hidden by S.
6712 Is_Primitive_Subp : Boolean;
6713 -- Set to True if the new subprogram is primitive
6716 -- Entity that S overrides
6718 Prev_Vis : Entity_Id := Empty;
6719 -- Predecessor of E in Homonym chain
6721 procedure Check_For_Primitive_Subprogram
6722 (Is_Primitive : out Boolean;
6723 Is_Overriding : Boolean := False);
6724 -- If the subprogram being analyzed is a primitive operation of the type
6725 -- of a formal or result, set the Has_Primitive_Operations flag on the
6726 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6727 -- corresponding flag on the entity itself for later use.
6729 procedure Check_Synchronized_Overriding
6730 (Def_Id : Entity_Id;
6731 Overridden_Subp : out Entity_Id);
6732 -- First determine if Def_Id is an entry or a subprogram either defined
6733 -- in the scope of a task or protected type, or is a primitive of such
6734 -- a type. Check whether Def_Id overrides a subprogram of an interface
6735 -- implemented by the synchronized type, return the overridden entity
6738 function Is_Private_Declaration (E : Entity_Id) return Boolean;
6739 -- Check that E is declared in the private part of the current package,
6740 -- or in the package body, where it may hide a previous declaration.
6741 -- We can't use In_Private_Part by itself because this flag is also
6742 -- set when freezing entities, so we must examine the place of the
6743 -- declaration in the tree, and recognize wrapper packages as well.
6745 function Is_Overriding_Alias
6747 New_E : Entity_Id) return Boolean;
6748 -- Check whether new subprogram and old subprogram are both inherited
6749 -- from subprograms that have distinct dispatch table entries. This can
6750 -- occur with derivations from instances with accidental homonyms.
6751 -- The function is conservative given that the converse is only true
6752 -- within instances that contain accidental overloadings.
6754 ------------------------------------
6755 -- Check_For_Primitive_Subprogram --
6756 ------------------------------------
6758 procedure Check_For_Primitive_Subprogram
6759 (Is_Primitive : out Boolean;
6760 Is_Overriding : Boolean := False)
6766 function Visible_Part_Type (T : Entity_Id) return Boolean;
6767 -- Returns true if T is declared in the visible part of the current
6768 -- package scope; otherwise returns false. Assumes that T is declared
6771 procedure Check_Private_Overriding (T : Entity_Id);
6772 -- Checks that if a primitive abstract subprogram of a visible
6773 -- abstract type is declared in a private part, then it must override
6774 -- an abstract subprogram declared in the visible part. Also checks
6775 -- that if a primitive function with a controlling result is declared
6776 -- in a private part, then it must override a function declared in
6777 -- the visible part.
6779 ------------------------------
6780 -- Check_Private_Overriding --
6781 ------------------------------
6783 procedure Check_Private_Overriding (T : Entity_Id) is
6785 if Is_Package_Or_Generic_Package (Current_Scope)
6786 and then In_Private_Part (Current_Scope)
6787 and then Visible_Part_Type (T)
6788 and then not In_Instance
6790 if Is_Abstract_Type (T)
6791 and then Is_Abstract_Subprogram (S)
6792 and then (not Is_Overriding
6793 or else not Is_Abstract_Subprogram (E))
6795 Error_Msg_N ("abstract subprograms must be visible "
6796 & "(RM 3.9.3(10))!", S);
6798 elsif Ekind (S) = E_Function
6799 and then Is_Tagged_Type (T)
6800 and then T = Base_Type (Etype (S))
6801 and then not Is_Overriding
6804 ("private function with tagged result must"
6805 & " override visible-part function", S);
6807 ("\move subprogram to the visible part"
6808 & " (RM 3.9.3(10))", S);
6811 end Check_Private_Overriding;
6813 -----------------------
6814 -- Visible_Part_Type --
6815 -----------------------
6817 function Visible_Part_Type (T : Entity_Id) return Boolean is
6818 P : constant Node_Id := Unit_Declaration_Node (Scope (T));
6822 -- If the entity is a private type, then it must be declared in a
6825 if Ekind (T) in Private_Kind then
6829 -- Otherwise, we traverse the visible part looking for its
6830 -- corresponding declaration. We cannot use the declaration
6831 -- node directly because in the private part the entity of a
6832 -- private type is the one in the full view, which does not
6833 -- indicate that it is the completion of something visible.
6835 N := First (Visible_Declarations (Specification (P)));
6836 while Present (N) loop
6837 if Nkind (N) = N_Full_Type_Declaration
6838 and then Present (Defining_Identifier (N))
6839 and then T = Defining_Identifier (N)
6843 elsif Nkind_In (N, N_Private_Type_Declaration,
6844 N_Private_Extension_Declaration)
6845 and then Present (Defining_Identifier (N))
6846 and then T = Full_View (Defining_Identifier (N))
6855 end Visible_Part_Type;
6857 -- Start of processing for Check_For_Primitive_Subprogram
6860 Is_Primitive := False;
6862 if not Comes_From_Source (S) then
6865 -- If subprogram is at library level, it is not primitive operation
6867 elsif Current_Scope = Standard_Standard then
6870 elsif (Is_Package_Or_Generic_Package (Current_Scope)
6871 and then not In_Package_Body (Current_Scope))
6872 or else Is_Overriding
6874 -- For function, check return type
6876 if Ekind (S) = E_Function then
6877 if Ekind (Etype (S)) = E_Anonymous_Access_Type then
6878 F_Typ := Designated_Type (Etype (S));
6883 B_Typ := Base_Type (F_Typ);
6885 if Scope (B_Typ) = Current_Scope
6886 and then not Is_Class_Wide_Type (B_Typ)
6887 and then not Is_Generic_Type (B_Typ)
6889 Is_Primitive := True;
6890 Set_Has_Primitive_Operations (B_Typ);
6891 Set_Is_Primitive (S);
6892 Check_Private_Overriding (B_Typ);
6896 -- For all subprograms, check formals
6898 Formal := First_Formal (S);
6899 while Present (Formal) loop
6900 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then
6901 F_Typ := Designated_Type (Etype (Formal));
6903 F_Typ := Etype (Formal);
6906 B_Typ := Base_Type (F_Typ);
6908 if Ekind (B_Typ) = E_Access_Subtype then
6909 B_Typ := Base_Type (B_Typ);
6912 if Scope (B_Typ) = Current_Scope
6913 and then not Is_Class_Wide_Type (B_Typ)
6914 and then not Is_Generic_Type (B_Typ)
6916 Is_Primitive := True;
6917 Set_Is_Primitive (S);
6918 Set_Has_Primitive_Operations (B_Typ);
6919 Check_Private_Overriding (B_Typ);
6922 Next_Formal (Formal);
6925 end Check_For_Primitive_Subprogram;
6927 -----------------------------------
6928 -- Check_Synchronized_Overriding --
6929 -----------------------------------
6931 procedure Check_Synchronized_Overriding
6932 (Def_Id : Entity_Id;
6933 Overridden_Subp : out Entity_Id)
6935 Ifaces_List : Elist_Id;
6939 function Matches_Prefixed_View_Profile
6940 (Prim_Params : List_Id;
6941 Iface_Params : List_Id) return Boolean;
6942 -- Determine whether a subprogram's parameter profile Prim_Params
6943 -- matches that of a potentially overridden interface subprogram
6944 -- Iface_Params. Also determine if the type of first parameter of
6945 -- Iface_Params is an implemented interface.
6947 -----------------------------------
6948 -- Matches_Prefixed_View_Profile --
6949 -----------------------------------
6951 function Matches_Prefixed_View_Profile
6952 (Prim_Params : List_Id;
6953 Iface_Params : List_Id) return Boolean
6955 Iface_Id : Entity_Id;
6956 Iface_Param : Node_Id;
6957 Iface_Typ : Entity_Id;
6958 Prim_Id : Entity_Id;
6959 Prim_Param : Node_Id;
6960 Prim_Typ : Entity_Id;
6962 function Is_Implemented
6963 (Ifaces_List : Elist_Id;
6964 Iface : Entity_Id) return Boolean;
6965 -- Determine if Iface is implemented by the current task or
6968 --------------------
6969 -- Is_Implemented --
6970 --------------------
6972 function Is_Implemented
6973 (Ifaces_List : Elist_Id;
6974 Iface : Entity_Id) return Boolean
6976 Iface_Elmt : Elmt_Id;
6979 Iface_Elmt := First_Elmt (Ifaces_List);
6980 while Present (Iface_Elmt) loop
6981 if Node (Iface_Elmt) = Iface then
6985 Next_Elmt (Iface_Elmt);
6991 -- Start of processing for Matches_Prefixed_View_Profile
6994 Iface_Param := First (Iface_Params);
6995 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
6997 if Is_Access_Type (Iface_Typ) then
6998 Iface_Typ := Designated_Type (Iface_Typ);
7001 Prim_Param := First (Prim_Params);
7003 -- The first parameter of the potentially overridden subprogram
7004 -- must be an interface implemented by Prim.
7006 if not Is_Interface (Iface_Typ)
7007 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7012 -- The checks on the object parameters are done, move onto the
7013 -- rest of the parameters.
7015 if not In_Scope then
7016 Prim_Param := Next (Prim_Param);
7019 Iface_Param := Next (Iface_Param);
7020 while Present (Iface_Param) and then Present (Prim_Param) loop
7021 Iface_Id := Defining_Identifier (Iface_Param);
7022 Iface_Typ := Find_Parameter_Type (Iface_Param);
7024 Prim_Id := Defining_Identifier (Prim_Param);
7025 Prim_Typ := Find_Parameter_Type (Prim_Param);
7027 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7028 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7029 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7031 Iface_Typ := Designated_Type (Iface_Typ);
7032 Prim_Typ := Designated_Type (Prim_Typ);
7035 -- Case of multiple interface types inside a parameter profile
7037 -- (Obj_Param : in out Iface; ...; Param : Iface)
7039 -- If the interface type is implemented, then the matching type
7040 -- in the primitive should be the implementing record type.
7042 if Ekind (Iface_Typ) = E_Record_Type
7043 and then Is_Interface (Iface_Typ)
7044 and then Is_Implemented (Ifaces_List, Iface_Typ)
7046 if Prim_Typ /= Typ then
7050 -- The two parameters must be both mode and subtype conformant
7052 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7054 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7063 -- One of the two lists contains more parameters than the other
7065 if Present (Iface_Param) or else Present (Prim_Param) then
7070 end Matches_Prefixed_View_Profile;
7072 -- Start of processing for Check_Synchronized_Overriding
7075 Overridden_Subp := Empty;
7077 -- Def_Id must be an entry or a subprogram. We should skip predefined
7078 -- primitives internally generated by the frontend; however at this
7079 -- stage predefined primitives are still not fully decorated. As a
7080 -- minor optimization we skip here internally generated subprograms.
7082 if (Ekind (Def_Id) /= E_Entry
7083 and then Ekind (Def_Id) /= E_Function
7084 and then Ekind (Def_Id) /= E_Procedure)
7085 or else not Comes_From_Source (Def_Id)
7090 -- Search for the concurrent declaration since it contains the list
7091 -- of all implemented interfaces. In this case, the subprogram is
7092 -- declared within the scope of a protected or a task type.
7094 if Present (Scope (Def_Id))
7095 and then Is_Concurrent_Type (Scope (Def_Id))
7096 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7098 Typ := Scope (Def_Id);
7101 -- The enclosing scope is not a synchronized type and the subprogram
7104 elsif No (First_Formal (Def_Id)) then
7107 -- The subprogram has formals and hence it may be a primitive of a
7111 Typ := Etype (First_Formal (Def_Id));
7113 if Is_Access_Type (Typ) then
7114 Typ := Directly_Designated_Type (Typ);
7117 if Is_Concurrent_Type (Typ)
7118 and then not Is_Generic_Actual_Type (Typ)
7122 -- This case occurs when the concurrent type is declared within
7123 -- a generic unit. As a result the corresponding record has been
7124 -- built and used as the type of the first formal, we just have
7125 -- to retrieve the corresponding concurrent type.
7127 elsif Is_Concurrent_Record_Type (Typ)
7128 and then Present (Corresponding_Concurrent_Type (Typ))
7130 Typ := Corresponding_Concurrent_Type (Typ);
7138 -- There is no overriding to check if is an inherited operation in a
7139 -- type derivation on for a generic actual.
7141 Collect_Interfaces (Typ, Ifaces_List);
7143 if Is_Empty_Elmt_List (Ifaces_List) then
7147 -- Determine whether entry or subprogram Def_Id overrides a primitive
7148 -- operation that belongs to one of the interfaces in Ifaces_List.
7151 Candidate : Entity_Id := Empty;
7152 Hom : Entity_Id := Empty;
7153 Iface_Typ : Entity_Id;
7154 Subp : Entity_Id := Empty;
7157 -- Traverse the homonym chain, looking at a potentially
7158 -- overridden subprogram that belongs to an implemented
7161 Hom := Current_Entity_In_Scope (Def_Id);
7162 while Present (Hom) loop
7166 or else not Is_Overloadable (Subp)
7167 or else not Is_Primitive (Subp)
7168 or else not Is_Dispatching_Operation (Subp)
7169 or else not Present (Find_Dispatching_Type (Subp))
7170 or else not Is_Interface (Find_Dispatching_Type (Subp))
7174 -- Entries and procedures can override abstract or null
7175 -- interface procedures
7177 elsif (Ekind (Def_Id) = E_Procedure
7178 or else Ekind (Def_Id) = E_Entry)
7179 and then Ekind (Subp) = E_Procedure
7180 and then Matches_Prefixed_View_Profile
7181 (Parameter_Specifications (Parent (Def_Id)),
7182 Parameter_Specifications (Parent (Subp)))
7186 -- For an overridden subprogram Subp, check whether the mode
7187 -- of its first parameter is correct depending on the kind
7188 -- of synchronized type.
7191 Formal : constant Node_Id := First_Formal (Candidate);
7194 -- In order for an entry or a protected procedure to
7195 -- override, the first parameter of the overridden
7196 -- routine must be of mode "out", "in out" or
7197 -- access-to-variable.
7199 if (Ekind (Candidate) = E_Entry
7200 or else Ekind (Candidate) = E_Procedure)
7201 and then Is_Protected_Type (Typ)
7202 and then Ekind (Formal) /= E_In_Out_Parameter
7203 and then Ekind (Formal) /= E_Out_Parameter
7204 and then Nkind (Parameter_Type (Parent (Formal)))
7205 /= N_Access_Definition
7209 -- All other cases are OK since a task entry or routine
7210 -- does not have a restriction on the mode of the first
7211 -- parameter of the overridden interface routine.
7214 Overridden_Subp := Candidate;
7219 -- Functions can override abstract interface functions
7221 elsif Ekind (Def_Id) = E_Function
7222 and then Ekind (Subp) = E_Function
7223 and then Matches_Prefixed_View_Profile
7224 (Parameter_Specifications (Parent (Def_Id)),
7225 Parameter_Specifications (Parent (Subp)))
7226 and then Etype (Result_Definition (Parent (Def_Id))) =
7227 Etype (Result_Definition (Parent (Subp)))
7229 Overridden_Subp := Subp;
7233 Hom := Homonym (Hom);
7236 -- After examining all candidates for overriding, we are
7237 -- left with the best match which is a mode incompatible
7238 -- interface routine. Do not emit an error if the Expander
7239 -- is active since this error will be detected later on
7240 -- after all concurrent types are expanded and all wrappers
7241 -- are built. This check is meant for spec-only
7244 if Present (Candidate)
7245 and then not Expander_Active
7248 Find_Parameter_Type (Parent (First_Formal (Candidate)));
7250 -- Def_Id is primitive of a protected type, declared
7251 -- inside the type, and the candidate is primitive of a
7252 -- limited or synchronized interface.
7255 and then Is_Protected_Type (Typ)
7257 (Is_Limited_Interface (Iface_Typ)
7258 or else Is_Protected_Interface (Iface_Typ)
7259 or else Is_Synchronized_Interface (Iface_Typ)
7260 or else Is_Task_Interface (Iface_Typ))
7262 -- Must reword this message, comma before to in -gnatj
7266 ("first formal of & must be of mode `OUT`, `IN OUT`"
7267 & " or access-to-variable", Typ, Candidate);
7269 ("\to be overridden by protected procedure or entry "
7270 & "(RM 9.4(11.9/2))", Typ);
7274 Overridden_Subp := Candidate;
7277 end Check_Synchronized_Overriding;
7279 ----------------------------
7280 -- Is_Private_Declaration --
7281 ----------------------------
7283 function Is_Private_Declaration (E : Entity_Id) return Boolean is
7284 Priv_Decls : List_Id;
7285 Decl : constant Node_Id := Unit_Declaration_Node (E);
7288 if Is_Package_Or_Generic_Package (Current_Scope)
7289 and then In_Private_Part (Current_Scope)
7292 Private_Declarations (
7293 Specification (Unit_Declaration_Node (Current_Scope)));
7295 return In_Package_Body (Current_Scope)
7297 (Is_List_Member (Decl)
7298 and then List_Containing (Decl) = Priv_Decls)
7299 or else (Nkind (Parent (Decl)) = N_Package_Specification
7302 (Defining_Entity (Parent (Decl)))
7303 and then List_Containing (Parent (Parent (Decl)))
7308 end Is_Private_Declaration;
7310 --------------------------
7311 -- Is_Overriding_Alias --
7312 --------------------------
7314 function Is_Overriding_Alias
7316 New_E : Entity_Id) return Boolean
7318 AO : constant Entity_Id := Alias (Old_E);
7319 AN : constant Entity_Id := Alias (New_E);
7322 return Scope (AO) /= Scope (AN)
7323 or else No (DTC_Entity (AO))
7324 or else No (DTC_Entity (AN))
7325 or else DT_Position (AO) = DT_Position (AN);
7326 end Is_Overriding_Alias;
7328 -- Start of processing for New_Overloaded_Entity
7331 -- We need to look for an entity that S may override. This must be a
7332 -- homonym in the current scope, so we look for the first homonym of
7333 -- S in the current scope as the starting point for the search.
7335 E := Current_Entity_In_Scope (S);
7337 -- If there is no homonym then this is definitely not overriding
7340 Enter_Overloaded_Entity (S);
7341 Check_Dispatching_Operation (S, Empty);
7342 Check_For_Primitive_Subprogram (Is_Primitive_Subp);
7344 -- If subprogram has an explicit declaration, check whether it
7345 -- has an overriding indicator.
7347 if Comes_From_Source (S) then
7348 Check_Synchronized_Overriding (S, Overridden_Subp);
7349 Check_Overriding_Indicator
7350 (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp);
7353 -- If there is a homonym that is not overloadable, then we have an
7354 -- error, except for the special cases checked explicitly below.
7356 elsif not Is_Overloadable (E) then
7358 -- Check for spurious conflict produced by a subprogram that has the
7359 -- same name as that of the enclosing generic package. The conflict
7360 -- occurs within an instance, between the subprogram and the renaming
7361 -- declaration for the package. After the subprogram, the package
7362 -- renaming declaration becomes hidden.
7364 if Ekind (E) = E_Package
7365 and then Present (Renamed_Object (E))
7366 and then Renamed_Object (E) = Current_Scope
7367 and then Nkind (Parent (Renamed_Object (E))) =
7368 N_Package_Specification
7369 and then Present (Generic_Parent (Parent (Renamed_Object (E))))
7372 Set_Is_Immediately_Visible (E, False);
7373 Enter_Overloaded_Entity (S);
7374 Set_Homonym (S, Homonym (E));
7375 Check_Dispatching_Operation (S, Empty);
7376 Check_Overriding_Indicator (S, Empty, Is_Primitive => False);
7378 -- If the subprogram is implicit it is hidden by the previous
7379 -- declaration. However if it is dispatching, it must appear in the
7380 -- dispatch table anyway, because it can be dispatched to even if it
7381 -- cannot be called directly.
7383 elsif Present (Alias (S))
7384 and then not Comes_From_Source (S)
7386 Set_Scope (S, Current_Scope);
7388 if Is_Dispatching_Operation (Alias (S)) then
7389 Check_Dispatching_Operation (S, Empty);
7395 Error_Msg_Sloc := Sloc (E);
7397 -- Generate message, with useful additional warning if in generic
7399 if Is_Generic_Unit (E) then
7400 Error_Msg_N ("previous generic unit cannot be overloaded", S);
7401 Error_Msg_N ("\& conflicts with declaration#", S);
7403 Error_Msg_N ("& conflicts with declaration#", S);
7409 -- E exists and is overloadable
7412 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
7413 -- need no check against the homonym chain. They are directly added
7414 -- to the list of primitive operations of Derived_Type.
7416 if Ada_Version >= Ada_05
7417 and then Present (Derived_Type)
7418 and then Is_Dispatching_Operation (Alias (S))
7419 and then Present (Find_Dispatching_Type (Alias (S)))
7420 and then Is_Interface (Find_Dispatching_Type (Alias (S)))
7422 goto Add_New_Entity;
7425 Check_Synchronized_Overriding (S, Overridden_Subp);
7427 -- Loop through E and its homonyms to determine if any of them is
7428 -- the candidate for overriding by S.
7430 while Present (E) loop
7432 -- Definitely not interesting if not in the current scope
7434 if Scope (E) /= Current_Scope then
7437 -- Check if we have type conformance
7439 elsif Type_Conformant (E, S) then
7441 -- If the old and new entities have the same profile and one
7442 -- is not the body of the other, then this is an error, unless
7443 -- one of them is implicitly declared.
7445 -- There are some cases when both can be implicit, for example
7446 -- when both a literal and a function that overrides it are
7447 -- inherited in a derivation, or when an inherited operation
7448 -- of a tagged full type overrides the inherited operation of
7449 -- a private extension. Ada 83 had a special rule for the
7450 -- literal case. In Ada95, the later implicit operation hides
7451 -- the former, and the literal is always the former. In the
7452 -- odd case where both are derived operations declared at the
7453 -- same point, both operations should be declared, and in that
7454 -- case we bypass the following test and proceed to the next
7455 -- part. This can only occur for certain obscure cases in
7456 -- instances, when an operation on a type derived from a formal
7457 -- private type does not override a homograph inherited from
7458 -- the actual. In subsequent derivations of such a type, the
7459 -- DT positions of these operations remain distinct, if they
7462 if Present (Alias (S))
7463 and then (No (Alias (E))
7464 or else Comes_From_Source (E)
7465 or else Is_Abstract_Subprogram (S)
7467 (Is_Dispatching_Operation (E)
7468 and then Is_Overriding_Alias (E, S)))
7469 and then Ekind (E) /= E_Enumeration_Literal
7471 -- When an derived operation is overloaded it may be due to
7472 -- the fact that the full view of a private extension
7473 -- re-inherits. It has to be dealt with.
7475 if Is_Package_Or_Generic_Package (Current_Scope)
7476 and then In_Private_Part (Current_Scope)
7478 Check_Operation_From_Private_View (S, E);
7481 -- In any case the implicit operation remains hidden by
7482 -- the existing declaration, which is overriding.
7484 Set_Is_Overriding_Operation (E);
7486 if Comes_From_Source (E) then
7487 Check_Overriding_Indicator (E, S, Is_Primitive => False);
7489 -- Indicate that E overrides the operation from which
7492 if Present (Alias (S)) then
7493 Set_Overridden_Operation (E, Alias (S));
7495 Set_Overridden_Operation (E, S);
7501 -- Within an instance, the renaming declarations for actual
7502 -- subprograms may become ambiguous, but they do not hide each
7505 elsif Ekind (E) /= E_Entry
7506 and then not Comes_From_Source (E)
7507 and then not Is_Generic_Instance (E)
7508 and then (Present (Alias (E))
7509 or else Is_Intrinsic_Subprogram (E))
7510 and then (not In_Instance
7511 or else No (Parent (E))
7512 or else Nkind (Unit_Declaration_Node (E)) /=
7513 N_Subprogram_Renaming_Declaration)
7515 -- A subprogram child unit is not allowed to override an
7516 -- inherited subprogram (10.1.1(20)).
7518 if Is_Child_Unit (S) then
7520 ("child unit overrides inherited subprogram in parent",
7525 if Is_Non_Overriding_Operation (E, S) then
7526 Enter_Overloaded_Entity (S);
7528 if No (Derived_Type)
7529 or else Is_Tagged_Type (Derived_Type)
7531 Check_Dispatching_Operation (S, Empty);
7537 -- E is a derived operation or an internal operator which
7538 -- is being overridden. Remove E from further visibility.
7539 -- Furthermore, if E is a dispatching operation, it must be
7540 -- replaced in the list of primitive operations of its type
7541 -- (see Override_Dispatching_Operation).
7543 Overridden_Subp := E;
7549 Prev := First_Entity (Current_Scope);
7550 while Present (Prev)
7551 and then Next_Entity (Prev) /= E
7556 -- It is possible for E to be in the current scope and
7557 -- yet not in the entity chain. This can only occur in a
7558 -- generic context where E is an implicit concatenation
7559 -- in the formal part, because in a generic body the
7560 -- entity chain starts with the formals.
7563 (Present (Prev) or else Chars (E) = Name_Op_Concat);
7565 -- E must be removed both from the entity_list of the
7566 -- current scope, and from the visibility chain
7568 if Debug_Flag_E then
7569 Write_Str ("Override implicit operation ");
7570 Write_Int (Int (E));
7574 -- If E is a predefined concatenation, it stands for four
7575 -- different operations. As a result, a single explicit
7576 -- declaration does not hide it. In a possible ambiguous
7577 -- situation, Disambiguate chooses the user-defined op,
7578 -- so it is correct to retain the previous internal one.
7580 if Chars (E) /= Name_Op_Concat
7581 or else Ekind (E) /= E_Operator
7583 -- For nondispatching derived operations that are
7584 -- overridden by a subprogram declared in the private
7585 -- part of a package, we retain the derived subprogram
7586 -- but mark it as not immediately visible. If the
7587 -- derived operation was declared in the visible part
7588 -- then this ensures that it will still be visible
7589 -- outside the package with the proper signature
7590 -- (calls from outside must also be directed to this
7591 -- version rather than the overriding one, unlike the
7592 -- dispatching case). Calls from inside the package
7593 -- will still resolve to the overriding subprogram
7594 -- since the derived one is marked as not visible
7595 -- within the package.
7597 -- If the private operation is dispatching, we achieve
7598 -- the overriding by keeping the implicit operation
7599 -- but setting its alias to be the overriding one. In
7600 -- this fashion the proper body is executed in all
7601 -- cases, but the original signature is used outside
7604 -- If the overriding is not in the private part, we
7605 -- remove the implicit operation altogether.
7607 if Is_Private_Declaration (S) then
7608 if not Is_Dispatching_Operation (E) then
7609 Set_Is_Immediately_Visible (E, False);
7611 -- Work done in Override_Dispatching_Operation,
7612 -- so nothing else need to be done here.
7618 -- Find predecessor of E in Homonym chain
7620 if E = Current_Entity (E) then
7623 Prev_Vis := Current_Entity (E);
7624 while Homonym (Prev_Vis) /= E loop
7625 Prev_Vis := Homonym (Prev_Vis);
7629 if Prev_Vis /= Empty then
7631 -- Skip E in the visibility chain
7633 Set_Homonym (Prev_Vis, Homonym (E));
7636 Set_Name_Entity_Id (Chars (E), Homonym (E));
7639 Set_Next_Entity (Prev, Next_Entity (E));
7641 if No (Next_Entity (Prev)) then
7642 Set_Last_Entity (Current_Scope, Prev);
7648 Enter_Overloaded_Entity (S);
7649 Set_Is_Overriding_Operation (S);
7650 Check_Overriding_Indicator (S, E, Is_Primitive => True);
7652 -- If S is a user-defined subprogram or a null procedure
7653 -- expanded to override an inherited null procedure, then
7654 -- indicate that E overrides the operation from which S
7655 -- is inherited. It seems odd that Overridden_Operation
7656 -- isn't set in all cases where Is_Overriding_Operation
7657 -- is true, but doing so causes infinite loops in the
7658 -- compiler for implicit overriding subprograms. ???
7660 if Comes_From_Source (S)
7662 (Present (Parent (S))
7664 Nkind (Parent (S)) = N_Procedure_Specification
7666 Null_Present (Parent (S)))
7668 if Present (Alias (E)) then
7669 Set_Overridden_Operation (S, Alias (E));
7671 Set_Overridden_Operation (S, E);
7675 if Is_Dispatching_Operation (E) then
7677 -- An overriding dispatching subprogram inherits the
7678 -- convention of the overridden subprogram (by
7681 Set_Convention (S, Convention (E));
7682 Check_Dispatching_Operation (S, E);
7685 Check_Dispatching_Operation (S, Empty);
7688 Check_For_Primitive_Subprogram
7689 (Is_Primitive_Subp, Is_Overriding => True);
7690 goto Check_Inequality;
7693 -- Apparent redeclarations in instances can occur when two
7694 -- formal types get the same actual type. The subprograms in
7695 -- in the instance are legal, even if not callable from the
7696 -- outside. Calls from within are disambiguated elsewhere.
7697 -- For dispatching operations in the visible part, the usual
7698 -- rules apply, and operations with the same profile are not
7701 elsif (In_Instance_Visible_Part
7702 and then not Is_Dispatching_Operation (E))
7703 or else In_Instance_Not_Visible
7707 -- Here we have a real error (identical profile)
7710 Error_Msg_Sloc := Sloc (E);
7712 -- Avoid cascaded errors if the entity appears in
7713 -- subsequent calls.
7715 Set_Scope (S, Current_Scope);
7717 -- Generate error, with extra useful warning for the case
7718 -- of a generic instance with no completion.
7720 if Is_Generic_Instance (S)
7721 and then not Has_Completion (E)
7724 ("instantiation cannot provide body for&", S);
7725 Error_Msg_N ("\& conflicts with declaration#", S);
7727 Error_Msg_N ("& conflicts with declaration#", S);
7734 -- If one subprogram has an access parameter and the other
7735 -- a parameter of an access type, calls to either might be
7736 -- ambiguous. Verify that parameters match except for the
7737 -- access parameter.
7739 if May_Hide_Profile then
7745 F1 := First_Formal (S);
7746 F2 := First_Formal (E);
7747 while Present (F1) and then Present (F2) loop
7748 if Is_Access_Type (Etype (F1)) then
7749 if not Is_Access_Type (Etype (F2))
7750 or else not Conforming_Types
7751 (Designated_Type (Etype (F1)),
7752 Designated_Type (Etype (F2)),
7755 May_Hide_Profile := False;
7759 not Conforming_Types
7760 (Etype (F1), Etype (F2), Type_Conformant)
7762 May_Hide_Profile := False;
7773 Error_Msg_NE ("calls to& may be ambiguous?", S, S);
7784 -- On exit, we know that S is a new entity
7786 Enter_Overloaded_Entity (S);
7787 Check_For_Primitive_Subprogram (Is_Primitive_Subp);
7788 Check_Overriding_Indicator
7789 (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp);
7791 -- If S is a derived operation for an untagged type then by
7792 -- definition it's not a dispatching operation (even if the parent
7793 -- operation was dispatching), so we don't call
7794 -- Check_Dispatching_Operation in that case.
7796 if No (Derived_Type)
7797 or else Is_Tagged_Type (Derived_Type)
7799 Check_Dispatching_Operation (S, Empty);
7803 -- If this is a user-defined equality operator that is not a derived
7804 -- subprogram, create the corresponding inequality. If the operation is
7805 -- dispatching, the expansion is done elsewhere, and we do not create
7806 -- an explicit inequality operation.
7808 <<Check_Inequality>>
7809 if Chars (S) = Name_Op_Eq
7810 and then Etype (S) = Standard_Boolean
7811 and then Present (Parent (S))
7812 and then not Is_Dispatching_Operation (S)
7814 Make_Inequality_Operator (S);
7816 end New_Overloaded_Entity;
7818 ---------------------
7819 -- Process_Formals --
7820 ---------------------
7822 procedure Process_Formals
7824 Related_Nod : Node_Id)
7826 Param_Spec : Node_Id;
7828 Formal_Type : Entity_Id;
7832 Num_Out_Params : Nat := 0;
7833 First_Out_Param : Entity_Id := Empty;
7834 -- Used for setting Is_Only_Out_Parameter
7836 function Designates_From_With_Type (Typ : Entity_Id) return Boolean;
7837 -- Determine whether an access type designates a type coming from a
7840 function Is_Class_Wide_Default (D : Node_Id) return Boolean;
7841 -- Check whether the default has a class-wide type. After analysis the
7842 -- default has the type of the formal, so we must also check explicitly
7843 -- for an access attribute.
7845 -------------------------------
7846 -- Designates_From_With_Type --
7847 -------------------------------
7849 function Designates_From_With_Type (Typ : Entity_Id) return Boolean is
7850 Desig : Entity_Id := Typ;
7853 if Is_Access_Type (Desig) then
7854 Desig := Directly_Designated_Type (Desig);
7857 if Is_Class_Wide_Type (Desig) then
7858 Desig := Root_Type (Desig);
7862 Ekind (Desig) = E_Incomplete_Type
7863 and then From_With_Type (Desig);
7864 end Designates_From_With_Type;
7866 ---------------------------
7867 -- Is_Class_Wide_Default --
7868 ---------------------------
7870 function Is_Class_Wide_Default (D : Node_Id) return Boolean is
7872 return Is_Class_Wide_Type (Designated_Type (Etype (D)))
7873 or else (Nkind (D) = N_Attribute_Reference
7874 and then Attribute_Name (D) = Name_Access
7875 and then Is_Class_Wide_Type (Etype (Prefix (D))));
7876 end Is_Class_Wide_Default;
7878 -- Start of processing for Process_Formals
7881 -- In order to prevent premature use of the formals in the same formal
7882 -- part, the Ekind is left undefined until all default expressions are
7883 -- analyzed. The Ekind is established in a separate loop at the end.
7885 Param_Spec := First (T);
7886 while Present (Param_Spec) loop
7887 Formal := Defining_Identifier (Param_Spec);
7888 Set_Never_Set_In_Source (Formal, True);
7889 Enter_Name (Formal);
7891 -- Case of ordinary parameters
7893 if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then
7894 Find_Type (Parameter_Type (Param_Spec));
7895 Ptype := Parameter_Type (Param_Spec);
7897 if Ptype = Error then
7901 Formal_Type := Entity (Ptype);
7903 if Is_Incomplete_Type (Formal_Type)
7905 (Is_Class_Wide_Type (Formal_Type)
7906 and then Is_Incomplete_Type (Root_Type (Formal_Type)))
7908 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
7909 -- primitive operations, as long as their completion is
7910 -- in the same declarative part. If in the private part
7911 -- this means that the type cannot be a Taft-amendment type.
7912 -- Check is done on package exit. For access to subprograms,
7913 -- the use is legal for Taft-amendment types.
7915 if Is_Tagged_Type (Formal_Type) then
7916 if Ekind (Scope (Current_Scope)) = E_Package
7917 and then In_Private_Part (Scope (Current_Scope))
7918 and then not From_With_Type (Formal_Type)
7919 and then not Is_Class_Wide_Type (Formal_Type)
7922 (Parent (T), N_Access_Function_Definition,
7923 N_Access_Procedure_Definition)
7927 Private_Dependents (Base_Type (Formal_Type)));
7931 -- Special handling of Value_Type for CIL case
7933 elsif Is_Value_Type (Formal_Type) then
7936 elsif not Nkind_In (Parent (T), N_Access_Function_Definition,
7937 N_Access_Procedure_Definition)
7940 ("invalid use of incomplete type&",
7941 Param_Spec, Formal_Type);
7943 -- Further checks on the legality of incomplete types
7944 -- in formal parts must be delayed until the freeze point
7945 -- of the enclosing subprogram or access to subprogram.
7948 elsif Ekind (Formal_Type) = E_Void then
7949 Error_Msg_NE ("premature use of&",
7950 Parameter_Type (Param_Spec), Formal_Type);
7953 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7954 -- declaration corresponding to the null-excluding type of the
7955 -- formal in the enclosing scope. Finally, replace the parameter
7956 -- type of the formal with the internal subtype.
7958 if Ada_Version >= Ada_05
7959 and then Null_Exclusion_Present (Param_Spec)
7961 if not Is_Access_Type (Formal_Type) then
7963 ("`NOT NULL` allowed only for an access type", Param_Spec);
7966 if Can_Never_Be_Null (Formal_Type)
7967 and then Comes_From_Source (Related_Nod)
7970 ("`NOT NULL` not allowed (& already excludes null)",
7976 Create_Null_Excluding_Itype
7978 Related_Nod => Related_Nod,
7979 Scope_Id => Scope (Current_Scope));
7981 -- If the designated type of the itype is an itype we
7982 -- decorate it with the Has_Delayed_Freeze attribute to
7983 -- avoid problems with the backend.
7986 -- type T is access procedure;
7987 -- procedure Op (O : not null T);
7989 if Is_Itype (Directly_Designated_Type (Formal_Type)) then
7990 Set_Has_Delayed_Freeze (Formal_Type);
7995 -- An access formal type
7999 Access_Definition (Related_Nod, Parameter_Type (Param_Spec));
8001 -- No need to continue if we already notified errors
8003 if not Present (Formal_Type) then
8007 -- Ada 2005 (AI-254)
8010 AD : constant Node_Id :=
8011 Access_To_Subprogram_Definition
8012 (Parameter_Type (Param_Spec));
8014 if Present (AD) and then Protected_Present (AD) then
8016 Replace_Anonymous_Access_To_Protected_Subprogram
8022 Set_Etype (Formal, Formal_Type);
8023 Default := Expression (Param_Spec);
8025 if Present (Default) then
8026 if Out_Present (Param_Spec) then
8028 ("default initialization only allowed for IN parameters",
8032 -- Do the special preanalysis of the expression (see section on
8033 -- "Handling of Default Expressions" in the spec of package Sem).
8035 Preanalyze_Spec_Expression (Default, Formal_Type);
8037 -- An access to constant cannot be the default for
8038 -- an access parameter that is an access to variable.
8040 if Ekind (Formal_Type) = E_Anonymous_Access_Type
8041 and then not Is_Access_Constant (Formal_Type)
8042 and then Is_Access_Type (Etype (Default))
8043 and then Is_Access_Constant (Etype (Default))
8046 ("formal that is access to variable cannot be initialized " &
8047 "with an access-to-constant expression", Default);
8050 -- Check that the designated type of an access parameter's default
8051 -- is not a class-wide type unless the parameter's designated type
8052 -- is also class-wide.
8054 if Ekind (Formal_Type) = E_Anonymous_Access_Type
8055 and then not Designates_From_With_Type (Formal_Type)
8056 and then Is_Class_Wide_Default (Default)
8057 and then not Is_Class_Wide_Type (Designated_Type (Formal_Type))
8060 ("access to class-wide expression not allowed here", Default);
8063 -- Check incorrect use of dynamically tagged expressions
8065 if Is_Tagged_Type (Formal_Type) then
8066 Check_Dynamically_Tagged_Expression
8069 Related_Nod => Default);
8073 -- Ada 2005 (AI-231): Static checks
8075 if Ada_Version >= Ada_05
8076 and then Is_Access_Type (Etype (Formal))
8077 and then Can_Never_Be_Null (Etype (Formal))
8079 Null_Exclusion_Static_Checks (Param_Spec);
8086 -- If this is the formal part of a function specification, analyze the
8087 -- subtype mark in the context where the formals are visible but not
8088 -- yet usable, and may hide outer homographs.
8090 if Nkind (Related_Nod) = N_Function_Specification then
8091 Analyze_Return_Type (Related_Nod);
8094 -- Now set the kind (mode) of each formal
8096 Param_Spec := First (T);
8098 while Present (Param_Spec) loop
8099 Formal := Defining_Identifier (Param_Spec);
8100 Set_Formal_Mode (Formal);
8102 if Ekind (Formal) = E_In_Parameter then
8103 Set_Default_Value (Formal, Expression (Param_Spec));
8105 if Present (Expression (Param_Spec)) then
8106 Default := Expression (Param_Spec);
8108 if Is_Scalar_Type (Etype (Default)) then
8110 (Parameter_Type (Param_Spec)) /= N_Access_Definition
8112 Formal_Type := Entity (Parameter_Type (Param_Spec));
8115 Formal_Type := Access_Definition
8116 (Related_Nod, Parameter_Type (Param_Spec));
8119 Apply_Scalar_Range_Check (Default, Formal_Type);
8123 elsif Ekind (Formal) = E_Out_Parameter then
8124 Num_Out_Params := Num_Out_Params + 1;
8126 if Num_Out_Params = 1 then
8127 First_Out_Param := Formal;
8130 elsif Ekind (Formal) = E_In_Out_Parameter then
8131 Num_Out_Params := Num_Out_Params + 1;
8137 if Present (First_Out_Param) and then Num_Out_Params = 1 then
8138 Set_Is_Only_Out_Parameter (First_Out_Param);
8140 end Process_Formals;
8146 procedure Process_PPCs
8148 Spec_Id : Entity_Id;
8149 Body_Id : Entity_Id)
8151 Loc : constant Source_Ptr := Sloc (N);
8153 Plist : List_Id := No_List;
8157 function Grab_PPC (Nam : Name_Id) return Node_Id;
8158 -- Prag contains an analyzed precondition or postcondition pragma.
8159 -- This function copies the pragma, changes it to the corresponding
8160 -- Check pragma and returns the Check pragma as the result. The
8161 -- argument Nam is either Name_Precondition or Name_Postcondition.
8167 function Grab_PPC (Nam : Name_Id) return Node_Id is
8168 CP : constant Node_Id := New_Copy_Tree (Prag);
8171 -- Set Analyzed to false, since we want to reanalyze the check
8172 -- procedure. Note that it is only at the outer level that we
8173 -- do this fiddling, for the spec cases, the already preanalyzed
8174 -- parameters are not affected.
8176 -- For a postcondition pragma within a generic, preserve the pragma
8177 -- for later expansion.
8179 Set_Analyzed (CP, False);
8181 if Nam = Name_Postcondition
8182 and then not Expander_Active
8187 -- Change pragma into corresponding pragma Check
8189 Prepend_To (Pragma_Argument_Associations (CP),
8190 Make_Pragma_Argument_Association (Sloc (Prag),
8192 Make_Identifier (Loc,
8194 Set_Pragma_Identifier (CP,
8195 Make_Identifier (Sloc (Prag),
8196 Chars => Name_Check));
8201 -- Start of processing for Process_PPCs
8204 -- Nothing to do if we are not generating code
8206 if Operating_Mode /= Generate_Code then
8210 -- Grab preconditions from spec
8212 if Present (Spec_Id) then
8214 -- Loop through PPC pragmas from spec. Note that preconditions from
8215 -- the body will be analyzed and converted when we scan the body
8216 -- declarations below.
8218 Prag := Spec_PPC_List (Spec_Id);
8219 while Present (Prag) loop
8220 if Pragma_Name (Prag) = Name_Precondition
8221 and then Pragma_Enabled (Prag)
8223 -- Add pragma Check at the start of the declarations of N.
8224 -- Note that this processing reverses the order of the list,
8225 -- which is what we want since new entries were chained to
8226 -- the head of the list.
8228 Prepend (Grab_PPC (Name_Precondition), Declarations (N));
8231 Prag := Next_Pragma (Prag);
8235 -- Build postconditions procedure if needed and prepend the following
8236 -- declaration to the start of the declarations for the subprogram.
8238 -- procedure _postconditions [(_Result : resulttype)] is
8240 -- pragma Check (Postcondition, condition [,message]);
8241 -- pragma Check (Postcondition, condition [,message]);
8245 -- First we deal with the postconditions in the body
8247 if Is_Non_Empty_List (Declarations (N)) then
8249 -- Loop through declarations
8251 Prag := First (Declarations (N));
8252 while Present (Prag) loop
8253 if Nkind (Prag) = N_Pragma then
8255 -- If pragma, capture if enabled postcondition, else ignore
8257 if Pragma_Name (Prag) = Name_Postcondition
8258 and then Check_Enabled (Name_Postcondition)
8260 if Plist = No_List then
8261 Plist := Empty_List;
8266 -- If expansion is disabled, as in a generic unit,
8267 -- save pragma for later expansion.
8269 if not Expander_Active then
8270 Prepend (Grab_PPC (Name_Postcondition), Declarations (N));
8272 Append (Grab_PPC (Name_Postcondition), Plist);
8278 -- Not a pragma, if comes from source, then end scan
8280 elsif Comes_From_Source (Prag) then
8283 -- Skip stuff not coming from source
8291 -- Now deal with any postconditions from the spec
8293 if Present (Spec_Id) then
8295 -- Loop through PPC pragmas from spec
8297 Prag := Spec_PPC_List (Spec_Id);
8298 while Present (Prag) loop
8299 if Pragma_Name (Prag) = Name_Postcondition
8300 and then Pragma_Enabled (Prag)
8302 if Plist = No_List then
8303 Plist := Empty_List;
8306 if not Expander_Active then
8307 Prepend (Grab_PPC (Name_Postcondition), Declarations (N));
8309 Append (Grab_PPC (Name_Postcondition), Plist);
8313 Prag := Next_Pragma (Prag);
8317 -- If we had any postconditions and expansion is enabled, build
8318 -- the _Postconditions procedure.
8321 and then Expander_Active
8323 Subp := Defining_Entity (N);
8325 if Etype (Subp) /= Standard_Void_Type then
8327 Make_Parameter_Specification (Loc,
8328 Defining_Identifier =>
8329 Make_Defining_Identifier (Loc,
8330 Chars => Name_uResult),
8331 Parameter_Type => New_Occurrence_Of (Etype (Subp), Loc)));
8337 Post_Proc : constant Entity_Id :=
8338 Make_Defining_Identifier (Loc,
8339 Chars => Name_uPostconditions);
8340 -- The entity for the _Postconditions procedure
8342 Prepend_To (Declarations (N),
8343 Make_Subprogram_Body (Loc,
8345 Make_Procedure_Specification (Loc,
8346 Defining_Unit_Name => Post_Proc,
8347 Parameter_Specifications => Parms),
8349 Declarations => Empty_List,
8351 Handled_Statement_Sequence =>
8352 Make_Handled_Sequence_Of_Statements (Loc,
8353 Statements => Plist)));
8355 -- If this is a procedure, set the Postcondition_Proc attribute on
8356 -- the proper defining entity for the subprogram.
8358 if Etype (Subp) = Standard_Void_Type then
8359 if Present (Spec_Id) then
8360 Set_Postcondition_Proc (Spec_Id, Post_Proc);
8362 Set_Postcondition_Proc (Body_Id, Post_Proc);
8367 if Present (Spec_Id) then
8368 Set_Has_Postconditions (Spec_Id);
8370 Set_Has_Postconditions (Body_Id);
8375 ----------------------------
8376 -- Reference_Body_Formals --
8377 ----------------------------
8379 procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is
8384 if Error_Posted (Spec) then
8388 -- Iterate over both lists. They may be of different lengths if the two
8389 -- specs are not conformant.
8391 Fs := First_Formal (Spec);
8392 Fb := First_Formal (Bod);
8393 while Present (Fs) and then Present (Fb) loop
8394 Generate_Reference (Fs, Fb, 'b');
8397 Style.Check_Identifier (Fb, Fs);
8400 Set_Spec_Entity (Fb, Fs);
8401 Set_Referenced (Fs, False);
8405 end Reference_Body_Formals;
8407 -------------------------
8408 -- Set_Actual_Subtypes --
8409 -------------------------
8411 procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is
8412 Loc : constant Source_Ptr := Sloc (N);
8416 First_Stmt : Node_Id := Empty;
8417 AS_Needed : Boolean;
8420 -- If this is an empty initialization procedure, no need to create
8421 -- actual subtypes (small optimization).
8423 if Ekind (Subp) = E_Procedure
8424 and then Is_Null_Init_Proc (Subp)
8429 Formal := First_Formal (Subp);
8430 while Present (Formal) loop
8431 T := Etype (Formal);
8433 -- We never need an actual subtype for a constrained formal
8435 if Is_Constrained (T) then
8438 -- If we have unknown discriminants, then we do not need an actual
8439 -- subtype, or more accurately we cannot figure it out! Note that
8440 -- all class-wide types have unknown discriminants.
8442 elsif Has_Unknown_Discriminants (T) then
8445 -- At this stage we have an unconstrained type that may need an
8446 -- actual subtype. For sure the actual subtype is needed if we have
8447 -- an unconstrained array type.
8449 elsif Is_Array_Type (T) then
8452 -- The only other case needing an actual subtype is an unconstrained
8453 -- record type which is an IN parameter (we cannot generate actual
8454 -- subtypes for the OUT or IN OUT case, since an assignment can
8455 -- change the discriminant values. However we exclude the case of
8456 -- initialization procedures, since discriminants are handled very
8457 -- specially in this context, see the section entitled "Handling of
8458 -- Discriminants" in Einfo.
8460 -- We also exclude the case of Discrim_SO_Functions (functions used
8461 -- in front end layout mode for size/offset values), since in such
8462 -- functions only discriminants are referenced, and not only are such
8463 -- subtypes not needed, but they cannot always be generated, because
8464 -- of order of elaboration issues.
8466 elsif Is_Record_Type (T)
8467 and then Ekind (Formal) = E_In_Parameter
8468 and then Chars (Formal) /= Name_uInit
8469 and then not Is_Unchecked_Union (T)
8470 and then not Is_Discrim_SO_Function (Subp)
8474 -- All other cases do not need an actual subtype
8480 -- Generate actual subtypes for unconstrained arrays and
8481 -- unconstrained discriminated records.
8484 if Nkind (N) = N_Accept_Statement then
8486 -- If expansion is active, The formal is replaced by a local
8487 -- variable that renames the corresponding entry of the
8488 -- parameter block, and it is this local variable that may
8489 -- require an actual subtype.
8491 if Expander_Active then
8492 Decl := Build_Actual_Subtype (T, Renamed_Object (Formal));
8494 Decl := Build_Actual_Subtype (T, Formal);
8497 if Present (Handled_Statement_Sequence (N)) then
8499 First (Statements (Handled_Statement_Sequence (N)));
8500 Prepend (Decl, Statements (Handled_Statement_Sequence (N)));
8501 Mark_Rewrite_Insertion (Decl);
8503 -- If the accept statement has no body, there will be no
8504 -- reference to the actuals, so no need to compute actual
8511 Decl := Build_Actual_Subtype (T, Formal);
8512 Prepend (Decl, Declarations (N));
8513 Mark_Rewrite_Insertion (Decl);
8516 -- The declaration uses the bounds of an existing object, and
8517 -- therefore needs no constraint checks.
8519 Analyze (Decl, Suppress => All_Checks);
8521 -- We need to freeze manually the generated type when it is
8522 -- inserted anywhere else than in a declarative part.
8524 if Present (First_Stmt) then
8525 Insert_List_Before_And_Analyze (First_Stmt,
8526 Freeze_Entity (Defining_Identifier (Decl), Loc));
8529 if Nkind (N) = N_Accept_Statement
8530 and then Expander_Active
8532 Set_Actual_Subtype (Renamed_Object (Formal),
8533 Defining_Identifier (Decl));
8535 Set_Actual_Subtype (Formal, Defining_Identifier (Decl));
8539 Next_Formal (Formal);
8541 end Set_Actual_Subtypes;
8543 ---------------------
8544 -- Set_Formal_Mode --
8545 ---------------------
8547 procedure Set_Formal_Mode (Formal_Id : Entity_Id) is
8548 Spec : constant Node_Id := Parent (Formal_Id);
8551 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
8552 -- since we ensure that corresponding actuals are always valid at the
8553 -- point of the call.
8555 if Out_Present (Spec) then
8556 if Ekind (Scope (Formal_Id)) = E_Function
8557 or else Ekind (Scope (Formal_Id)) = E_Generic_Function
8559 Error_Msg_N ("functions can only have IN parameters", Spec);
8560 Set_Ekind (Formal_Id, E_In_Parameter);
8562 elsif In_Present (Spec) then
8563 Set_Ekind (Formal_Id, E_In_Out_Parameter);
8566 Set_Ekind (Formal_Id, E_Out_Parameter);
8567 Set_Never_Set_In_Source (Formal_Id, True);
8568 Set_Is_True_Constant (Formal_Id, False);
8569 Set_Current_Value (Formal_Id, Empty);
8573 Set_Ekind (Formal_Id, E_In_Parameter);
8576 -- Set Is_Known_Non_Null for access parameters since the language
8577 -- guarantees that access parameters are always non-null. We also set
8578 -- Can_Never_Be_Null, since there is no way to change the value.
8580 if Nkind (Parameter_Type (Spec)) = N_Access_Definition then
8582 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
8583 -- null; In Ada 2005, only if then null_exclusion is explicit.
8585 if Ada_Version < Ada_05
8586 or else Can_Never_Be_Null (Etype (Formal_Id))
8588 Set_Is_Known_Non_Null (Formal_Id);
8589 Set_Can_Never_Be_Null (Formal_Id);
8592 -- Ada 2005 (AI-231): Null-exclusion access subtype
8594 elsif Is_Access_Type (Etype (Formal_Id))
8595 and then Can_Never_Be_Null (Etype (Formal_Id))
8597 Set_Is_Known_Non_Null (Formal_Id);
8600 Set_Mechanism (Formal_Id, Default_Mechanism);
8601 Set_Formal_Validity (Formal_Id);
8602 end Set_Formal_Mode;
8604 -------------------------
8605 -- Set_Formal_Validity --
8606 -------------------------
8608 procedure Set_Formal_Validity (Formal_Id : Entity_Id) is
8610 -- If no validity checking, then we cannot assume anything about the
8611 -- validity of parameters, since we do not know there is any checking
8612 -- of the validity on the call side.
8614 if not Validity_Checks_On then
8617 -- If validity checking for parameters is enabled, this means we are
8618 -- not supposed to make any assumptions about argument values.
8620 elsif Validity_Check_Parameters then
8623 -- If we are checking in parameters, we will assume that the caller is
8624 -- also checking parameters, so we can assume the parameter is valid.
8626 elsif Ekind (Formal_Id) = E_In_Parameter
8627 and then Validity_Check_In_Params
8629 Set_Is_Known_Valid (Formal_Id, True);
8631 -- Similar treatment for IN OUT parameters
8633 elsif Ekind (Formal_Id) = E_In_Out_Parameter
8634 and then Validity_Check_In_Out_Params
8636 Set_Is_Known_Valid (Formal_Id, True);
8638 end Set_Formal_Validity;
8640 ------------------------
8641 -- Subtype_Conformant --
8642 ------------------------
8644 function Subtype_Conformant
8645 (New_Id : Entity_Id;
8647 Skip_Controlling_Formals : Boolean := False) return Boolean
8651 Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result,
8652 Skip_Controlling_Formals => Skip_Controlling_Formals);
8654 end Subtype_Conformant;
8656 ---------------------
8657 -- Type_Conformant --
8658 ---------------------
8660 function Type_Conformant
8661 (New_Id : Entity_Id;
8663 Skip_Controlling_Formals : Boolean := False) return Boolean
8667 May_Hide_Profile := False;
8670 (New_Id, Old_Id, Type_Conformant, False, Result,
8671 Skip_Controlling_Formals => Skip_Controlling_Formals);
8673 end Type_Conformant;
8675 -------------------------------
8676 -- Valid_Operator_Definition --
8677 -------------------------------
8679 procedure Valid_Operator_Definition (Designator : Entity_Id) is
8682 Id : constant Name_Id := Chars (Designator);
8686 F := First_Formal (Designator);
8687 while Present (F) loop
8690 if Present (Default_Value (F)) then
8692 ("default values not allowed for operator parameters",
8699 -- Verify that user-defined operators have proper number of arguments
8700 -- First case of operators which can only be unary
8703 or else Id = Name_Op_Abs
8707 -- Case of operators which can be unary or binary
8709 elsif Id = Name_Op_Add
8710 or Id = Name_Op_Subtract
8712 N_OK := (N in 1 .. 2);
8714 -- All other operators can only be binary
8722 ("incorrect number of arguments for operator", Designator);
8726 and then Base_Type (Etype (Designator)) = Standard_Boolean
8727 and then not Is_Intrinsic_Subprogram (Designator)
8730 ("explicit definition of inequality not allowed", Designator);
8732 end Valid_Operator_Definition;