1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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 Rtsfind
; use Rtsfind
;
52 with Sem_Cat
; use Sem_Cat
;
53 with Sem_Ch3
; use Sem_Ch3
;
54 with Sem_Ch4
; use Sem_Ch4
;
55 with Sem_Ch5
; use Sem_Ch5
;
56 with Sem_Ch8
; use Sem_Ch8
;
57 with Sem_Ch10
; use Sem_Ch10
;
58 with Sem_Ch12
; use Sem_Ch12
;
59 with Sem_Disp
; use Sem_Disp
;
60 with Sem_Dist
; use Sem_Dist
;
61 with Sem_Elim
; use Sem_Elim
;
62 with Sem_Eval
; use Sem_Eval
;
63 with Sem_Mech
; use Sem_Mech
;
64 with Sem_Prag
; use Sem_Prag
;
65 with Sem_Res
; use Sem_Res
;
66 with Sem_Util
; use Sem_Util
;
67 with Sem_Type
; use Sem_Type
;
68 with Sem_Warn
; use Sem_Warn
;
69 with Sinput
; use Sinput
;
70 with Stand
; use Stand
;
71 with Sinfo
; use Sinfo
;
72 with Sinfo
.CN
; use Sinfo
.CN
;
73 with Snames
; use Snames
;
74 with Stringt
; use Stringt
;
76 with Stylesw
; use Stylesw
;
77 with Tbuild
; use Tbuild
;
78 with Uintp
; use Uintp
;
79 with Urealp
; use Urealp
;
80 with Validsw
; use Validsw
;
82 package body Sem_Ch6
is
84 May_Hide_Profile
: Boolean := False;
85 -- This flag is used to indicate that two formals in two subprograms being
86 -- checked for conformance differ only in that one is an access parameter
87 -- while the other is of a general access type with the same designated
88 -- type. In this case, if the rest of the signatures match, a call to
89 -- either subprogram may be ambiguous, which is worth a warning. The flag
90 -- is set in Compatible_Types, and the warning emitted in
91 -- New_Overloaded_Entity.
93 -----------------------
94 -- Local Subprograms --
95 -----------------------
97 procedure Analyze_Return_Statement
(N
: Node_Id
);
98 -- Common processing for simple_ and extended_return_statements
100 procedure Analyze_Function_Return
(N
: Node_Id
);
101 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
102 -- applies to a [generic] function.
104 procedure Analyze_Return_Type
(N
: Node_Id
);
105 -- Subsidiary to Process_Formals: analyze subtype mark in function
106 -- specification, in a context where the formals are visible and hide
109 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
110 -- Analyze a generic subprogram body. N is the body to be analyzed, and
111 -- Gen_Id is the defining entity Id for the corresponding spec.
113 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
);
114 -- If a subprogram has pragma Inline and inlining is active, use generic
115 -- machinery to build an unexpanded body for the subprogram. This body is
116 -- subsequently used for inline expansions at call sites. If subprogram can
117 -- be inlined (depending on size and nature of local declarations) this
118 -- function returns true. Otherwise subprogram body is treated normally.
119 -- If proper warnings are enabled and the subprogram contains a construct
120 -- that cannot be inlined, the offending construct is flagged accordingly.
122 procedure Check_Conformance
125 Ctype
: Conformance_Type
;
127 Conforms
: out Boolean;
128 Err_Loc
: Node_Id
:= Empty
;
129 Get_Inst
: Boolean := False;
130 Skip_Controlling_Formals
: Boolean := False);
131 -- Given two entities, this procedure checks that the profiles associated
132 -- with these entities meet the conformance criterion given by the third
133 -- parameter. If they conform, Conforms is set True and control returns
134 -- to the caller. If they do not conform, Conforms is set to False, and
135 -- in addition, if Errmsg is True on the call, proper messages are output
136 -- to complain about the conformance failure. If Err_Loc is non_Empty
137 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
138 -- error messages are placed on the appropriate part of the construct
139 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
140 -- against a formal access-to-subprogram type so Get_Instance_Of must
143 procedure Check_Subprogram_Order
(N
: Node_Id
);
144 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
145 -- the alpha ordering rule for N if this ordering requirement applicable.
147 procedure Check_Returns
151 Proc
: Entity_Id
:= Empty
);
152 -- Called to check for missing return statements in a function body, or for
153 -- returns present in a procedure body which has No_Return set. HSS is the
154 -- handled statement sequence for the subprogram body. This procedure
155 -- checks all flow paths to make sure they either have return (Mode = 'F',
156 -- used for functions) or do not have a return (Mode = 'P', used for
157 -- No_Return procedures). The flag Err is set if there are any control
158 -- paths not explicitly terminated by a return in the function case, and is
159 -- True otherwise. Proc is the entity for the procedure case and is used
160 -- in posting the warning message.
162 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
163 -- This procedure makes S, a new overloaded entity, into the first visible
164 -- entity with that name.
166 procedure Install_Entity
(E
: Entity_Id
);
167 -- Make single entity visible. Used for generic formals as well
169 function Is_Non_Overriding_Operation
171 New_E
: Entity_Id
) return Boolean;
172 -- Enforce the rule given in 12.3(18): a private operation in an instance
173 -- overrides an inherited operation only if the corresponding operation
174 -- was overriding in the generic. This can happen for primitive operations
175 -- of types derived (in the generic unit) from formal private or formal
178 procedure Make_Inequality_Operator
(S
: Entity_Id
);
179 -- Create the declaration for an inequality operator that is implicitly
180 -- created by a user-defined equality operator that yields a boolean.
182 procedure May_Need_Actuals
(Fun
: Entity_Id
);
183 -- Flag functions that can be called without parameters, i.e. those that
184 -- have no parameters, or those for which defaults exist for all parameters
186 procedure Process_PPCs
189 Body_Id
: Entity_Id
);
190 -- Called from Analyze_Body to deal with scanning post conditions for the
191 -- body and assembling and inserting the _postconditions procedure. N is
192 -- the node for the subprogram body and Body_Id/Spec_Id are the entities
193 -- for the body and separate spec (if there is no separate spec, Spec_Id
196 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
197 -- Formal_Id is an formal parameter entity. This procedure deals with
198 -- setting the proper validity status for this entity, which depends
199 -- on the kind of parameter and the validity checking mode.
201 ------------------------------
202 -- Analyze_Return_Statement --
203 ------------------------------
205 procedure Analyze_Return_Statement
(N
: Node_Id
) is
207 pragma Assert
(Nkind_In
(N
, N_Simple_Return_Statement
,
208 N_Extended_Return_Statement
));
210 Returns_Object
: constant Boolean :=
211 Nkind
(N
) = N_Extended_Return_Statement
213 (Nkind
(N
) = N_Simple_Return_Statement
214 and then Present
(Expression
(N
)));
215 -- True if we're returning something; that is, "return <expression>;"
216 -- or "return Result : T [:= ...]". False for "return;". Used for error
217 -- checking: If Returns_Object is True, N should apply to a function
218 -- body; otherwise N should apply to a procedure body, entry body,
219 -- accept statement, or extended return statement.
221 function Find_What_It_Applies_To
return Entity_Id
;
222 -- Find the entity representing the innermost enclosing body, accept
223 -- statement, or extended return statement. If the result is a callable
224 -- construct or extended return statement, then this will be the value
225 -- of the Return_Applies_To attribute. Otherwise, the program is
226 -- illegal. See RM-6.5(4/2).
228 -----------------------------
229 -- Find_What_It_Applies_To --
230 -----------------------------
232 function Find_What_It_Applies_To
return Entity_Id
is
233 Result
: Entity_Id
:= Empty
;
236 -- Loop outward through the Scope_Stack, skipping blocks and loops
238 for J
in reverse 0 .. Scope_Stack
.Last
loop
239 Result
:= Scope_Stack
.Table
(J
).Entity
;
240 exit when Ekind
(Result
) /= E_Block
and then
241 Ekind
(Result
) /= E_Loop
;
244 pragma Assert
(Present
(Result
));
246 end Find_What_It_Applies_To
;
248 -- Local declarations
250 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
251 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
252 Loc
: constant Source_Ptr
:= Sloc
(N
);
253 Stm_Entity
: constant Entity_Id
:=
255 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
257 -- Start of processing for Analyze_Return_Statement
260 Set_Return_Statement_Entity
(N
, Stm_Entity
);
262 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
263 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
265 -- Place Return entity on scope stack, to simplify enforcement of 6.5
266 -- (4/2): an inner return statement will apply to this extended return.
268 if Nkind
(N
) = N_Extended_Return_Statement
then
269 Push_Scope
(Stm_Entity
);
272 -- Check that pragma No_Return is obeyed
274 if No_Return
(Scope_Id
) then
275 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
278 -- Warn on any unassigned OUT parameters if in procedure
280 if Ekind
(Scope_Id
) = E_Procedure
then
281 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
284 -- Check that functions return objects, and other things do not
286 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
287 if not Returns_Object
then
288 Error_Msg_N
("missing expression in return from function", N
);
291 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
292 if Returns_Object
then
293 Error_Msg_N
("procedure cannot return value (use function)", N
);
296 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
297 if Returns_Object
then
298 if Is_Protected_Type
(Scope
(Scope_Id
)) then
299 Error_Msg_N
("entry body cannot return value", N
);
301 Error_Msg_N
("accept statement cannot return value", N
);
305 elsif Kind
= E_Return_Statement
then
307 -- We are nested within another return statement, which must be an
308 -- extended_return_statement.
310 if Returns_Object
then
312 ("extended_return_statement cannot return value; " &
313 "use `""RETURN;""`", N
);
317 Error_Msg_N
("illegal context for return statement", N
);
320 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
321 Analyze_Function_Return
(N
);
324 if Nkind
(N
) = N_Extended_Return_Statement
then
328 Kill_Current_Values
(Last_Assignment_Only
=> True);
329 Check_Unreachable_Code
(N
);
330 end Analyze_Return_Statement
;
332 ---------------------------------------------
333 -- Analyze_Abstract_Subprogram_Declaration --
334 ---------------------------------------------
336 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
337 Designator
: constant Entity_Id
:=
338 Analyze_Subprogram_Specification
(Specification
(N
));
339 Scop
: constant Entity_Id
:= Current_Scope
;
342 Generate_Definition
(Designator
);
343 Set_Is_Abstract_Subprogram
(Designator
);
344 New_Overloaded_Entity
(Designator
);
345 Check_Delayed_Subprogram
(Designator
);
347 Set_Categorization_From_Scope
(Designator
, Scop
);
349 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
351 ("abstract subprogram not allowed in protected type", N
);
353 -- Issue a warning if the abstract subprogram is neither a dispatching
354 -- operation nor an operation that overrides an inherited subprogram or
355 -- predefined operator, since this most likely indicates a mistake.
357 elsif Warn_On_Redundant_Constructs
358 and then not Is_Dispatching_Operation
(Designator
)
359 and then not Is_Overriding_Operation
(Designator
)
360 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
361 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
364 ("?abstract subprogram is not dispatching or overriding", N
);
367 Generate_Reference_To_Formals
(Designator
);
368 end Analyze_Abstract_Subprogram_Declaration
;
370 ----------------------------------------
371 -- Analyze_Extended_Return_Statement --
372 ----------------------------------------
374 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
376 Analyze_Return_Statement
(N
);
377 end Analyze_Extended_Return_Statement
;
379 ----------------------------
380 -- Analyze_Function_Call --
381 ----------------------------
383 procedure Analyze_Function_Call
(N
: Node_Id
) is
384 P
: constant Node_Id
:= Name
(N
);
385 L
: constant List_Id
:= Parameter_Associations
(N
);
391 -- A call of the form A.B (X) may be an Ada05 call, which is rewritten
392 -- as B (A, X). If the rewriting is successful, the call has been
393 -- analyzed and we just return.
395 if Nkind
(P
) = N_Selected_Component
396 and then Name
(N
) /= P
397 and then Is_Rewrite_Substitution
(N
)
398 and then Present
(Etype
(N
))
403 -- If error analyzing name, then set Any_Type as result type and return
405 if Etype
(P
) = Any_Type
then
406 Set_Etype
(N
, Any_Type
);
410 -- Otherwise analyze the parameters
414 while Present
(Actual
) loop
416 Check_Parameterless_Call
(Actual
);
422 end Analyze_Function_Call
;
424 -----------------------------
425 -- Analyze_Function_Return --
426 -----------------------------
428 procedure Analyze_Function_Return
(N
: Node_Id
) is
429 Loc
: constant Source_Ptr
:= Sloc
(N
);
430 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
431 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
433 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
434 -- Function result subtype
436 procedure Check_Limited_Return
(Expr
: Node_Id
);
437 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
438 -- limited types. Used only for simple return statements.
439 -- Expr is the expression returned.
441 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
442 -- Check that the return_subtype_indication properly matches the result
443 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
445 --------------------------
446 -- Check_Limited_Return --
447 --------------------------
449 procedure Check_Limited_Return
(Expr
: Node_Id
) is
451 -- Ada 2005 (AI-318-02): Return-by-reference types have been
452 -- removed and replaced by anonymous access results. This is an
453 -- incompatibility with Ada 95. Not clear whether this should be
454 -- enforced yet or perhaps controllable with special switch. ???
456 if Is_Limited_Type
(R_Type
)
457 and then Comes_From_Source
(N
)
458 and then not In_Instance_Body
459 and then not OK_For_Limited_Init_In_05
(Expr
)
463 if Ada_Version
>= Ada_05
464 and then not Debug_Flag_Dot_L
465 and then not GNAT_Mode
468 ("(Ada 2005) cannot copy object of a limited type " &
469 "(RM-2005 6.5(5.5/2))", Expr
);
470 if Is_Inherently_Limited_Type
(R_Type
) then
472 ("\return by reference not permitted in Ada 2005", Expr
);
475 -- Warn in Ada 95 mode, to give folks a heads up about this
478 -- In GNAT mode, this is just a warning, to allow it to be
479 -- evilly turned off. Otherwise it is a real error.
481 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
482 if Is_Inherently_Limited_Type
(R_Type
) then
484 ("return by reference not permitted in Ada 2005 " &
485 "(RM-2005 6.5(5.5/2))?", Expr
);
488 ("cannot copy object of a limited type in Ada 2005 " &
489 "(RM-2005 6.5(5.5/2))?", Expr
);
492 -- Ada 95 mode, compatibility warnings disabled
495 return; -- skip continuation messages below
499 ("\consider switching to return of access type", Expr
);
500 Explain_Limited_Type
(R_Type
, Expr
);
502 end Check_Limited_Return
;
504 -------------------------------------
505 -- Check_Return_Subtype_Indication --
506 -------------------------------------
508 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
509 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
510 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
511 -- Subtype given in the extended return statement;
512 -- this must match R_Type.
514 Subtype_Ind
: constant Node_Id
:=
515 Object_Definition
(Original_Node
(Obj_Decl
));
517 R_Type_Is_Anon_Access
:
519 Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
521 Ekind
(R_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
523 Ekind
(R_Type
) = E_Anonymous_Access_Type
;
524 -- True if return type of the function is an anonymous access type
525 -- Can't we make Is_Anonymous_Access_Type in einfo ???
527 R_Stm_Type_Is_Anon_Access
:
529 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Subprogram_Type
531 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
533 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Type
;
534 -- True if type of the return object is an anonymous access type
537 -- First, avoid cascade errors:
539 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
543 -- "return access T" case; check that the return statement also has
544 -- "access T", and that the subtypes statically match:
546 if R_Type_Is_Anon_Access
then
547 if R_Stm_Type_Is_Anon_Access
then
548 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
549 Base_Type
(Designated_Type
(R_Type
))
550 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
553 ("subtype must statically match function result subtype",
554 Subtype_Mark
(Subtype_Ind
));
558 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
561 -- Subtype_indication case; check that the types are the same, and
562 -- statically match if appropriate. A null exclusion may be present
563 -- on the return type, on the function specification, on the object
564 -- declaration or on the subtype itself.
566 elsif Base_Type
(R_Stm_Type
) = Base_Type
(R_Type
) then
567 if Is_Access_Type
(R_Type
)
569 (Can_Never_Be_Null
(R_Type
)
570 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
571 Can_Never_Be_Null
(R_Stm_Type
)
574 ("subtype must statically match function result subtype",
578 if Is_Constrained
(R_Type
) then
579 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
581 ("subtype must statically match function result subtype",
586 -- If the function's result type doesn't match the return object
587 -- entity's type, then we check for the case where the result type
588 -- is class-wide, and allow the declaration if the type of the object
589 -- definition matches the class-wide type. This prevents rejection
590 -- in the case where the object declaration is initialized by a call
591 -- to a build-in-place function with a specific result type and the
592 -- object entity had its type changed to that specific type. (Note
593 -- that the ARG believes that return objects should be allowed to
594 -- have a type covered by a class-wide result type in any case, so
595 -- once that relaxation is made (see AI05-32), the above check for
596 -- type compatibility should be changed to test Covers rather than
597 -- equality, and then the following special test will no longer be
600 elsif Is_Class_Wide_Type
(R_Type
)
602 R_Type
= Etype
(Object_Definition
(Original_Node
(Obj_Decl
)))
608 ("wrong type for return_subtype_indication", Subtype_Ind
);
610 end Check_Return_Subtype_Indication
;
612 ---------------------
613 -- Local Variables --
614 ---------------------
618 -- Start of processing for Analyze_Function_Return
621 Set_Return_Present
(Scope_Id
);
623 if Nkind
(N
) = N_Simple_Return_Statement
then
624 Expr
:= Expression
(N
);
625 Analyze_And_Resolve
(Expr
, R_Type
);
626 Check_Limited_Return
(Expr
);
629 -- Analyze parts specific to extended_return_statement:
632 Obj_Decl
: constant Node_Id
:=
633 Last
(Return_Object_Declarations
(N
));
635 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
638 Expr
:= Expression
(Obj_Decl
);
640 -- Note: The check for OK_For_Limited_Init will happen in
641 -- Analyze_Object_Declaration; we treat it as a normal
642 -- object declaration.
646 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
647 Check_Return_Subtype_Indication
(Obj_Decl
);
649 if Present
(HSS
) then
652 if Present
(Exception_Handlers
(HSS
)) then
654 -- ???Has_Nested_Block_With_Handler needs to be set.
655 -- Probably by creating an actual N_Block_Statement.
656 -- Probably in Expand.
662 Check_References
(Stm_Entity
);
666 -- Case of Expr present
670 -- Defend against previous errors
672 and then Nkind
(Expr
) /= N_Empty
673 and then Present
(Etype
(Expr
))
675 -- Apply constraint check. Note that this is done before the implicit
676 -- conversion of the expression done for anonymous access types to
677 -- ensure correct generation of the null-excluding check associated
678 -- with null-excluding expressions found in return statements.
680 Apply_Constraint_Check
(Expr
, R_Type
);
682 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
683 -- type, apply an implicit conversion of the expression to that type
684 -- to force appropriate static and run-time accessibility checks.
686 if Ada_Version
>= Ada_05
687 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
689 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
690 Analyze_And_Resolve
(Expr
, R_Type
);
693 -- If the result type is class-wide, then check that the return
694 -- expression's type is not declared at a deeper level than the
695 -- function (RM05-6.5(5.6/2)).
697 if Ada_Version
>= Ada_05
698 and then Is_Class_Wide_Type
(R_Type
)
700 if Type_Access_Level
(Etype
(Expr
)) >
701 Subprogram_Access_Level
(Scope_Id
)
704 ("level of return expression type is deeper than " &
705 "class-wide function!", Expr
);
709 if (Is_Class_Wide_Type
(Etype
(Expr
))
710 or else Is_Dynamically_Tagged
(Expr
))
711 and then not Is_Class_Wide_Type
(R_Type
)
714 ("dynamically tagged expression not allowed!", Expr
);
717 -- ??? A real run-time accessibility check is needed in cases
718 -- involving dereferences of access parameters. For now we just
719 -- check the static cases.
721 if (Ada_Version
< Ada_05
or else Debug_Flag_Dot_L
)
722 and then Is_Inherently_Limited_Type
(Etype
(Scope_Id
))
723 and then Object_Access_Level
(Expr
) >
724 Subprogram_Access_Level
(Scope_Id
)
727 Make_Raise_Program_Error
(Loc
,
728 Reason
=> PE_Accessibility_Check_Failed
));
732 ("cannot return a local value by reference?", N
);
734 ("\& will be raised at run time?",
735 N
, Standard_Program_Error
);
739 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
740 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
742 Apply_Compile_Time_Constraint_Error
744 Msg
=> "(Ada 2005) null not allowed for "
745 & "null-excluding return?",
746 Reason
=> CE_Null_Not_Allowed
);
749 end Analyze_Function_Return
;
751 -------------------------------------
752 -- Analyze_Generic_Subprogram_Body --
753 -------------------------------------
755 procedure Analyze_Generic_Subprogram_Body
759 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
760 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
766 -- Copy body and disable expansion while analyzing the generic For a
767 -- stub, do not copy the stub (which would load the proper body), this
768 -- will be done when the proper body is analyzed.
770 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
771 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
776 Spec
:= Specification
(N
);
778 -- Within the body of the generic, the subprogram is callable, and
779 -- behaves like the corresponding non-generic unit.
781 Body_Id
:= Defining_Entity
(Spec
);
783 if Kind
= E_Generic_Procedure
784 and then Nkind
(Spec
) /= N_Procedure_Specification
786 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
789 elsif Kind
= E_Generic_Function
790 and then Nkind
(Spec
) /= N_Function_Specification
792 Error_Msg_N
("invalid body for generic function ", Body_Id
);
796 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
798 if Has_Completion
(Gen_Id
)
799 and then Nkind
(Parent
(N
)) /= N_Subunit
801 Error_Msg_N
("duplicate generic body", N
);
804 Set_Has_Completion
(Gen_Id
);
807 if Nkind
(N
) = N_Subprogram_Body_Stub
then
808 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
810 Set_Corresponding_Spec
(N
, Gen_Id
);
813 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
814 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
817 -- Make generic parameters immediately visible in the body. They are
818 -- needed to process the formals declarations. Then make the formals
819 -- visible in a separate step.
825 First_Ent
: Entity_Id
;
828 First_Ent
:= First_Entity
(Gen_Id
);
831 while Present
(E
) and then not Is_Formal
(E
) loop
836 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
838 -- Now generic formals are visible, and the specification can be
839 -- analyzed, for subsequent conformance check.
841 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
843 -- Make formal parameters visible
847 -- E is the first formal parameter, we loop through the formals
848 -- installing them so that they will be visible.
850 Set_First_Entity
(Gen_Id
, E
);
851 while Present
(E
) loop
857 -- Visible generic entity is callable within its own body
859 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
860 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
861 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
862 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
863 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
864 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
866 if Nkind
(N
) = N_Subprogram_Body_Stub
then
868 -- No body to analyze, so restore state of generic unit
870 Set_Ekind
(Gen_Id
, Kind
);
871 Set_Ekind
(Body_Id
, Kind
);
873 if Present
(First_Ent
) then
874 Set_First_Entity
(Gen_Id
, First_Ent
);
881 -- If this is a compilation unit, it must be made visible explicitly,
882 -- because the compilation of the declaration, unlike other library
883 -- unit declarations, does not. If it is not a unit, the following
884 -- is redundant but harmless.
886 Set_Is_Immediately_Visible
(Gen_Id
);
887 Reference_Body_Formals
(Gen_Id
, Body_Id
);
889 if Is_Child_Unit
(Gen_Id
) then
890 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
893 Set_Actual_Subtypes
(N
, Current_Scope
);
894 Analyze_Declarations
(Declarations
(N
));
896 Analyze
(Handled_Statement_Sequence
(N
));
898 Save_Global_References
(Original_Node
(N
));
900 -- Prior to exiting the scope, include generic formals again (if any
901 -- are present) in the set of local entities.
903 if Present
(First_Ent
) then
904 Set_First_Entity
(Gen_Id
, First_Ent
);
907 Check_References
(Gen_Id
);
910 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
912 Check_Subprogram_Order
(N
);
914 -- Outside of its body, unit is generic again
916 Set_Ekind
(Gen_Id
, Kind
);
917 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
920 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
923 end Analyze_Generic_Subprogram_Body
;
925 -----------------------------
926 -- Analyze_Operator_Symbol --
927 -----------------------------
929 -- An operator symbol such as "+" or "and" may appear in context where the
930 -- literal denotes an entity name, such as "+"(x, y) or in context when it
931 -- is just a string, as in (conjunction = "or"). In these cases the parser
932 -- generates this node, and the semantics does the disambiguation. Other
933 -- such case are actuals in an instantiation, the generic unit in an
934 -- instantiation, and pragma arguments.
936 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
937 Par
: constant Node_Id
:= Parent
(N
);
940 if (Nkind
(Par
) = N_Function_Call
941 and then N
= Name
(Par
))
942 or else Nkind
(Par
) = N_Function_Instantiation
943 or else (Nkind
(Par
) = N_Indexed_Component
944 and then N
= Prefix
(Par
))
945 or else (Nkind
(Par
) = N_Pragma_Argument_Association
946 and then not Is_Pragma_String_Literal
(Par
))
947 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
948 or else (Nkind
(Par
) = N_Attribute_Reference
949 and then Attribute_Name
(Par
) /= Name_Value
)
951 Find_Direct_Name
(N
);
954 Change_Operator_Symbol_To_String_Literal
(N
);
957 end Analyze_Operator_Symbol
;
959 -----------------------------------
960 -- Analyze_Parameter_Association --
961 -----------------------------------
963 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
965 Analyze
(Explicit_Actual_Parameter
(N
));
966 end Analyze_Parameter_Association
;
968 ----------------------------
969 -- Analyze_Procedure_Call --
970 ----------------------------
972 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
973 Loc
: constant Source_Ptr
:= Sloc
(N
);
974 P
: constant Node_Id
:= Name
(N
);
975 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
979 procedure Analyze_Call_And_Resolve
;
980 -- Do Analyze and Resolve calls for procedure call
982 ------------------------------
983 -- Analyze_Call_And_Resolve --
984 ------------------------------
986 procedure Analyze_Call_And_Resolve
is
988 if Nkind
(N
) = N_Procedure_Call_Statement
then
990 Resolve
(N
, Standard_Void_Type
);
994 end Analyze_Call_And_Resolve
;
996 -- Start of processing for Analyze_Procedure_Call
999 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1000 -- a procedure call or an entry call. The prefix may denote an access
1001 -- to subprogram type, in which case an implicit dereference applies.
1002 -- If the prefix is an indexed component (without implicit dereference)
1003 -- then the construct denotes a call to a member of an entire family.
1004 -- If the prefix is a simple name, it may still denote a call to a
1005 -- parameterless member of an entry family. Resolution of these various
1006 -- interpretations is delicate.
1010 -- If this is a call of the form Obj.Op, the call may have been
1011 -- analyzed and possibly rewritten into a block, in which case
1014 if Analyzed
(N
) then
1018 -- If error analyzing prefix, then set Any_Type as result and return
1020 if Etype
(P
) = Any_Type
then
1021 Set_Etype
(N
, Any_Type
);
1025 -- Otherwise analyze the parameters
1027 if Present
(Actuals
) then
1028 Actual
:= First
(Actuals
);
1030 while Present
(Actual
) loop
1032 Check_Parameterless_Call
(Actual
);
1037 -- Special processing for Elab_Spec and Elab_Body calls
1039 if Nkind
(P
) = N_Attribute_Reference
1040 and then (Attribute_Name
(P
) = Name_Elab_Spec
1041 or else Attribute_Name
(P
) = Name_Elab_Body
)
1043 if Present
(Actuals
) then
1045 ("no parameters allowed for this call", First
(Actuals
));
1049 Set_Etype
(N
, Standard_Void_Type
);
1052 elsif Is_Entity_Name
(P
)
1053 and then Is_Record_Type
(Etype
(Entity
(P
)))
1054 and then Remote_AST_I_Dereference
(P
)
1058 elsif Is_Entity_Name
(P
)
1059 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1061 if Is_Access_Type
(Etype
(P
))
1062 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1063 and then No
(Actuals
)
1064 and then Comes_From_Source
(N
)
1066 Error_Msg_N
("missing explicit dereference in call", N
);
1069 Analyze_Call_And_Resolve
;
1071 -- If the prefix is the simple name of an entry family, this is
1072 -- a parameterless call from within the task body itself.
1074 elsif Is_Entity_Name
(P
)
1075 and then Nkind
(P
) = N_Identifier
1076 and then Ekind
(Entity
(P
)) = E_Entry_Family
1077 and then Present
(Actuals
)
1078 and then No
(Next
(First
(Actuals
)))
1080 -- Can be call to parameterless entry family. What appears to be the
1081 -- sole argument is in fact the entry index. Rewrite prefix of node
1082 -- accordingly. Source representation is unchanged by this
1086 Make_Indexed_Component
(Loc
,
1088 Make_Selected_Component
(Loc
,
1089 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1090 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1091 Expressions
=> Actuals
);
1092 Set_Name
(N
, New_N
);
1093 Set_Etype
(New_N
, Standard_Void_Type
);
1094 Set_Parameter_Associations
(N
, No_List
);
1095 Analyze_Call_And_Resolve
;
1097 elsif Nkind
(P
) = N_Explicit_Dereference
then
1098 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1099 Analyze_Call_And_Resolve
;
1101 Error_Msg_N
("expect access to procedure in call", P
);
1104 -- The name can be a selected component or an indexed component that
1105 -- yields an access to subprogram. Such a prefix is legal if the call
1106 -- has parameter associations.
1108 elsif Is_Access_Type
(Etype
(P
))
1109 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1111 if Present
(Actuals
) then
1112 Analyze_Call_And_Resolve
;
1114 Error_Msg_N
("missing explicit dereference in call ", N
);
1117 -- If not an access to subprogram, then the prefix must resolve to the
1118 -- name of an entry, entry family, or protected operation.
1120 -- For the case of a simple entry call, P is a selected component where
1121 -- the prefix is the task and the selector name is the entry. A call to
1122 -- a protected procedure will have the same syntax. If the protected
1123 -- object contains overloaded operations, the entity may appear as a
1124 -- function, the context will select the operation whose type is Void.
1126 elsif Nkind
(P
) = N_Selected_Component
1127 and then (Ekind
(Entity
(Selector_Name
(P
))) = E_Entry
1129 Ekind
(Entity
(Selector_Name
(P
))) = E_Procedure
1131 Ekind
(Entity
(Selector_Name
(P
))) = E_Function
)
1133 Analyze_Call_And_Resolve
;
1135 elsif Nkind
(P
) = N_Selected_Component
1136 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1137 and then Present
(Actuals
)
1138 and then No
(Next
(First
(Actuals
)))
1140 -- Can be call to parameterless entry family. What appears to be the
1141 -- sole argument is in fact the entry index. Rewrite prefix of node
1142 -- accordingly. Source representation is unchanged by this
1146 Make_Indexed_Component
(Loc
,
1147 Prefix
=> New_Copy
(P
),
1148 Expressions
=> Actuals
);
1149 Set_Name
(N
, New_N
);
1150 Set_Etype
(New_N
, Standard_Void_Type
);
1151 Set_Parameter_Associations
(N
, No_List
);
1152 Analyze_Call_And_Resolve
;
1154 -- For the case of a reference to an element of an entry family, P is
1155 -- an indexed component whose prefix is a selected component (task and
1156 -- entry family), and whose index is the entry family index.
1158 elsif Nkind
(P
) = N_Indexed_Component
1159 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1160 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1162 Analyze_Call_And_Resolve
;
1164 -- If the prefix is the name of an entry family, it is a call from
1165 -- within the task body itself.
1167 elsif Nkind
(P
) = N_Indexed_Component
1168 and then Nkind
(Prefix
(P
)) = N_Identifier
1169 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1172 Make_Selected_Component
(Loc
,
1173 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1174 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1175 Rewrite
(Prefix
(P
), New_N
);
1177 Analyze_Call_And_Resolve
;
1179 -- Anything else is an error
1182 Error_Msg_N
("invalid procedure or entry call", N
);
1184 end Analyze_Procedure_Call
;
1186 -------------------------------------
1187 -- Analyze_Simple_Return_Statement --
1188 -------------------------------------
1190 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1192 if Present
(Expression
(N
)) then
1193 Mark_Coextensions
(N
, Expression
(N
));
1196 Analyze_Return_Statement
(N
);
1197 end Analyze_Simple_Return_Statement
;
1199 -------------------------
1200 -- Analyze_Return_Type --
1201 -------------------------
1203 procedure Analyze_Return_Type
(N
: Node_Id
) is
1204 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1205 Typ
: Entity_Id
:= Empty
;
1208 -- Normal case where result definition does not indicate an error
1210 if Result_Definition
(N
) /= Error
then
1211 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1212 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1213 Set_Parent
(Typ
, Result_Definition
(N
));
1214 Set_Is_Local_Anonymous_Access
(Typ
);
1215 Set_Etype
(Designator
, Typ
);
1217 -- Subtype_Mark case
1220 Find_Type
(Result_Definition
(N
));
1221 Typ
:= Entity
(Result_Definition
(N
));
1222 Set_Etype
(Designator
, Typ
);
1224 if Ekind
(Typ
) = E_Incomplete_Type
1225 and then Is_Value_Type
(Typ
)
1229 elsif Ekind
(Typ
) = E_Incomplete_Type
1230 or else (Is_Class_Wide_Type
(Typ
)
1232 Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
1235 ("invalid use of incomplete type", Result_Definition
(N
));
1239 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1241 Null_Exclusion_Static_Checks
(N
);
1243 -- Case where result definition does indicate an error
1246 Set_Etype
(Designator
, Any_Type
);
1248 end Analyze_Return_Type
;
1250 -----------------------------
1251 -- Analyze_Subprogram_Body --
1252 -----------------------------
1254 -- This procedure is called for regular subprogram bodies, generic bodies,
1255 -- and for subprogram stubs of both kinds. In the case of stubs, only the
1256 -- specification matters, and is used to create a proper declaration for
1257 -- the subprogram, or to perform conformance checks.
1259 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
1260 Loc
: constant Source_Ptr
:= Sloc
(N
);
1261 Body_Deleted
: constant Boolean := False;
1262 Body_Spec
: constant Node_Id
:= Specification
(N
);
1263 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
1264 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
1265 Conformant
: Boolean;
1267 Missing_Ret
: Boolean;
1269 Prot_Typ
: Entity_Id
:= Empty
;
1270 Spec_Id
: Entity_Id
;
1271 Spec_Decl
: Node_Id
:= Empty
;
1273 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
1274 -- When we analyze a separate spec, the entity chain ends up containing
1275 -- the formals, as well as any itypes generated during analysis of the
1276 -- default expressions for parameters, or the arguments of associated
1277 -- precondition/postcondition pragmas (which are analyzed in the context
1278 -- of the spec since they have visibility on formals).
1280 -- These entities belong with the spec and not the body. However we do
1281 -- the analysis of the body in the context of the spec (again to obtain
1282 -- visibility to the formals), and all the entities generated during
1283 -- this analysis end up also chained to the entity chain of the spec.
1284 -- But they really belong to the body, and there is circuitry to move
1285 -- them from the spec to the body.
1287 -- However, when we do this move, we don't want to move the real spec
1288 -- entities (first para above) to the body. The Last_Real_Spec_Entity
1289 -- variable points to the last real spec entity, so we only move those
1290 -- chained beyond that point. It is initialized to Empty to deal with
1291 -- the case where there is no separate spec.
1293 procedure Check_Anonymous_Return
;
1294 -- (Ada 2005): if a function returns an access type that denotes a task,
1295 -- or a type that contains tasks, we must create a master entity for
1296 -- the anonymous type, which typically will be used in an allocator
1297 -- in the body of the function.
1299 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
1300 -- Look ahead to recognize a pragma that may appear after the body.
1301 -- If there is a previous spec, check that it appears in the same
1302 -- declarative part. If the pragma is Inline_Always, perform inlining
1303 -- unconditionally, otherwise only if Front_End_Inlining is requested.
1304 -- If the body acts as a spec, and inlining is required, we create a
1305 -- subprogram declaration for it, in order to attach the body to inline.
1306 -- If pragma does not appear after the body, check whether there is
1307 -- an inline pragma before any local declarations.
1309 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
1310 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
1311 -- subprogram whose body is being analyzed. N is the statement node
1312 -- causing the flag to be set, if the following statement is a return
1313 -- of an entity, we mark the entity as set in source to suppress any
1314 -- warning on the stylized use of function stubs with a dummy return.
1316 procedure Verify_Overriding_Indicator
;
1317 -- If there was a previous spec, the entity has been entered in the
1318 -- current scope previously. If the body itself carries an overriding
1319 -- indicator, check that it is consistent with the known status of the
1322 ----------------------------
1323 -- Check_Anonymous_Return --
1324 ----------------------------
1326 procedure Check_Anonymous_Return
is
1331 if Present
(Spec_Id
) then
1337 if Ekind
(Scop
) = E_Function
1338 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
1339 and then Has_Task
(Designated_Type
(Etype
(Scop
)))
1340 and then Expander_Active
1343 Make_Object_Declaration
(Loc
,
1344 Defining_Identifier
=>
1345 Make_Defining_Identifier
(Loc
, Name_uMaster
),
1346 Constant_Present
=> True,
1347 Object_Definition
=>
1348 New_Reference_To
(RTE
(RE_Master_Id
), Loc
),
1350 Make_Explicit_Dereference
(Loc
,
1351 New_Reference_To
(RTE
(RE_Current_Master
), Loc
)));
1353 if Present
(Declarations
(N
)) then
1354 Prepend
(Decl
, Declarations
(N
));
1356 Set_Declarations
(N
, New_List
(Decl
));
1359 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
1360 Set_Has_Master_Entity
(Scop
);
1362 end Check_Anonymous_Return
;
1364 -------------------------
1365 -- Check_Inline_Pragma --
1366 -------------------------
1368 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
1372 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
1373 -- True when N is a pragma Inline or Inline_Awlays that applies
1374 -- to this subprogram.
1376 -----------------------
1377 -- Is_Inline_Pragma --
1378 -----------------------
1380 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
1383 Nkind
(N
) = N_Pragma
1385 (Pragma_Name
(N
) = Name_Inline_Always
1388 and then Pragma_Name
(N
) = Name_Inline
))
1391 (Expression
(First
(Pragma_Argument_Associations
(N
))))
1393 end Is_Inline_Pragma
;
1395 -- Start of processing for Check_Inline_Pragma
1398 if not Expander_Active
then
1402 if Is_List_Member
(N
)
1403 and then Present
(Next
(N
))
1404 and then Is_Inline_Pragma
(Next
(N
))
1408 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
1409 and then Present
(Declarations
(N
))
1410 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
1412 Prag
:= First
(Declarations
(N
));
1418 if Present
(Prag
) then
1419 if Present
(Spec_Id
) then
1420 if List_Containing
(N
) =
1421 List_Containing
(Unit_Declaration_Node
(Spec_Id
))
1427 -- Create a subprogram declaration, to make treatment uniform
1430 Subp
: constant Entity_Id
:=
1431 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
1432 Decl
: constant Node_Id
:=
1433 Make_Subprogram_Declaration
(Loc
,
1434 Specification
=> New_Copy_Tree
(Specification
(N
)));
1436 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
1438 if Present
(First_Formal
(Body_Id
)) then
1439 Plist
:= Copy_Parameter_List
(Body_Id
);
1440 Set_Parameter_Specifications
1441 (Specification
(Decl
), Plist
);
1444 Insert_Before
(N
, Decl
);
1447 Set_Has_Pragma_Inline
(Subp
);
1449 if Pragma_Name
(Prag
) = Name_Inline_Always
then
1450 Set_Is_Inlined
(Subp
);
1451 Set_Has_Pragma_Inline_Always
(Subp
);
1458 end Check_Inline_Pragma
;
1460 ----------------------------
1461 -- Set_Trivial_Subprogram --
1462 ----------------------------
1464 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
1465 Nxt
: constant Node_Id
:= Next
(N
);
1468 Set_Is_Trivial_Subprogram
(Body_Id
);
1470 if Present
(Spec_Id
) then
1471 Set_Is_Trivial_Subprogram
(Spec_Id
);
1475 and then Nkind
(Nxt
) = N_Simple_Return_Statement
1476 and then No
(Next
(Nxt
))
1477 and then Present
(Expression
(Nxt
))
1478 and then Is_Entity_Name
(Expression
(Nxt
))
1480 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
1482 end Set_Trivial_Subprogram
;
1484 ---------------------------------
1485 -- Verify_Overriding_Indicator --
1486 ---------------------------------
1488 procedure Verify_Overriding_Indicator
is
1490 if Must_Override
(Body_Spec
) then
1491 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1492 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1496 elsif not Is_Overriding_Operation
(Spec_Id
) then
1498 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
1501 elsif Must_Not_Override
(Body_Spec
) then
1502 if Is_Overriding_Operation
(Spec_Id
) then
1504 ("subprogram& overrides inherited operation",
1505 Body_Spec
, Spec_Id
);
1507 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1508 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1511 ("subprogram & overrides predefined operator ",
1512 Body_Spec
, Spec_Id
);
1514 -- If this is not a primitive operation the overriding indicator
1515 -- is altogether illegal.
1517 elsif not Is_Primitive
(Spec_Id
) then
1518 Error_Msg_N
("overriding indicator only allowed " &
1519 "if subprogram is primitive",
1523 end Verify_Overriding_Indicator
;
1525 -- Start of processing for Analyze_Subprogram_Body
1528 if Debug_Flag_C
then
1529 Write_Str
("==== Compiling subprogram body ");
1530 Write_Name
(Chars
(Body_Id
));
1531 Write_Str
(" from ");
1532 Write_Location
(Loc
);
1536 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
1538 -- Generic subprograms are handled separately. They always have a
1539 -- generic specification. Determine whether current scope has a
1540 -- previous declaration.
1542 -- If the subprogram body is defined within an instance of the same
1543 -- name, the instance appears as a package renaming, and will be hidden
1544 -- within the subprogram.
1546 if Present
(Prev_Id
)
1547 and then not Is_Overloadable
(Prev_Id
)
1548 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
1549 or else Comes_From_Source
(Prev_Id
))
1551 if Is_Generic_Subprogram
(Prev_Id
) then
1553 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1554 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1556 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
1560 -- Previous entity conflicts with subprogram name. Attempting to
1561 -- enter name will post error.
1563 Enter_Name
(Body_Id
);
1567 -- Non-generic case, find the subprogram declaration, if one was seen,
1568 -- or enter new overloaded entity in the current scope. If the
1569 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
1570 -- part of the context of one of its subunits. No need to redo the
1573 elsif Prev_Id
= Body_Id
1574 and then Has_Completion
(Body_Id
)
1579 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
1581 if Nkind
(N
) = N_Subprogram_Body_Stub
1582 or else No
(Corresponding_Spec
(N
))
1584 Spec_Id
:= Find_Corresponding_Spec
(N
);
1586 -- If this is a duplicate body, no point in analyzing it
1588 if Error_Posted
(N
) then
1592 -- A subprogram body should cause freezing of its own declaration,
1593 -- but if there was no previous explicit declaration, then the
1594 -- subprogram will get frozen too late (there may be code within
1595 -- the body that depends on the subprogram having been frozen,
1596 -- such as uses of extra formals), so we force it to be frozen
1597 -- here. Same holds if the body and spec are compilation units.
1599 if No
(Spec_Id
) then
1600 Freeze_Before
(N
, Body_Id
);
1602 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1603 Freeze_Before
(N
, Spec_Id
);
1607 Spec_Id
:= Corresponding_Spec
(N
);
1611 -- Do not inline any subprogram that contains nested subprograms, since
1612 -- the backend inlining circuit seems to generate uninitialized
1613 -- references in this case. We know this happens in the case of front
1614 -- end ZCX support, but it also appears it can happen in other cases as
1615 -- well. The backend often rejects attempts to inline in the case of
1616 -- nested procedures anyway, so little if anything is lost by this.
1617 -- Note that this is test is for the benefit of the back-end. There is
1618 -- a separate test for front-end inlining that also rejects nested
1621 -- Do not do this test if errors have been detected, because in some
1622 -- error cases, this code blows up, and we don't need it anyway if
1623 -- there have been errors, since we won't get to the linker anyway.
1625 if Comes_From_Source
(Body_Id
)
1626 and then Serious_Errors_Detected
= 0
1630 P_Ent
:= Scope
(P_Ent
);
1631 exit when No
(P_Ent
) or else P_Ent
= Standard_Standard
;
1633 if Is_Subprogram
(P_Ent
) then
1634 Set_Is_Inlined
(P_Ent
, False);
1636 if Comes_From_Source
(P_Ent
)
1637 and then Has_Pragma_Inline
(P_Ent
)
1640 ("cannot inline& (nested subprogram)?",
1647 Check_Inline_Pragma
(Spec_Id
);
1649 -- Case of fully private operation in the body of the protected type.
1650 -- We must create a declaration for the subprogram, in order to attach
1651 -- the protected subprogram that will be used in internal calls.
1654 and then Comes_From_Source
(N
)
1655 and then Is_Protected_Type
(Current_Scope
)
1664 Formal
:= First_Formal
(Body_Id
);
1666 -- The protected operation always has at least one formal, namely
1667 -- the object itself, but it is only placed in the parameter list
1668 -- if expansion is enabled.
1671 or else Expander_Active
1673 Plist
:= Copy_Parameter_List
(Body_Id
);
1678 if Nkind
(Body_Spec
) = N_Procedure_Specification
then
1680 Make_Procedure_Specification
(Loc
,
1681 Defining_Unit_Name
=>
1682 Make_Defining_Identifier
(Sloc
(Body_Id
),
1683 Chars
=> Chars
(Body_Id
)),
1684 Parameter_Specifications
=> Plist
);
1687 Make_Function_Specification
(Loc
,
1688 Defining_Unit_Name
=>
1689 Make_Defining_Identifier
(Sloc
(Body_Id
),
1690 Chars
=> Chars
(Body_Id
)),
1691 Parameter_Specifications
=> Plist
,
1692 Result_Definition
=>
1693 New_Occurrence_Of
(Etype
(Body_Id
), Loc
));
1697 Make_Subprogram_Declaration
(Loc
,
1698 Specification
=> New_Spec
);
1699 Insert_Before
(N
, Decl
);
1700 Spec_Id
:= Defining_Unit_Name
(New_Spec
);
1702 -- Indicate that the entity comes from source, to ensure that
1703 -- cross-reference information is properly generated. The body
1704 -- itself is rewritten during expansion, and the body entity will
1705 -- not appear in calls to the operation.
1707 Set_Comes_From_Source
(Spec_Id
, True);
1709 Set_Has_Completion
(Spec_Id
);
1710 Set_Convention
(Spec_Id
, Convention_Protected
);
1713 elsif Present
(Spec_Id
) then
1714 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
1715 Verify_Overriding_Indicator
;
1717 -- In general, the spec will be frozen when we start analyzing the
1718 -- body. However, for internally generated operations, such as
1719 -- wrapper functions for inherited operations with controlling
1720 -- results, the spec may not have been frozen by the time we
1721 -- expand the freeze actions that include the bodies. In particular,
1722 -- extra formals for accessibility or for return-in-place may need
1723 -- to be generated. Freeze nodes, if any, are inserted before the
1726 if not Is_Frozen
(Spec_Id
)
1727 and then Expander_Active
1729 -- Force the generation of its freezing node to ensure proper
1730 -- management of access types in the backend.
1732 -- This is definitely needed for some cases, but it is not clear
1733 -- why, to be investigated further???
1735 Set_Has_Delayed_Freeze
(Spec_Id
);
1736 Insert_Actions
(N
, Freeze_Entity
(Spec_Id
, Loc
));
1740 -- Place subprogram on scope stack, and make formals visible. If there
1741 -- is a spec, the visible entity remains that of the spec.
1743 if Present
(Spec_Id
) then
1744 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
1746 if Is_Child_Unit
(Spec_Id
) then
1747 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
1751 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
1754 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1755 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1757 if Is_Abstract_Subprogram
(Spec_Id
) then
1758 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
1762 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
1763 Set_Has_Completion
(Spec_Id
);
1765 if Is_Protected_Type
(Scope
(Spec_Id
)) then
1766 Prot_Typ
:= Scope
(Spec_Id
);
1769 -- If this is a body generated for a renaming, do not check for
1770 -- full conformance. The check is redundant, because the spec of
1771 -- the body is a copy of the spec in the renaming declaration,
1772 -- and the test can lead to spurious errors on nested defaults.
1774 if Present
(Spec_Decl
)
1775 and then not Comes_From_Source
(N
)
1777 (Nkind
(Original_Node
(Spec_Decl
)) =
1778 N_Subprogram_Renaming_Declaration
1779 or else (Present
(Corresponding_Body
(Spec_Decl
))
1781 Nkind
(Unit_Declaration_Node
1782 (Corresponding_Body
(Spec_Decl
))) =
1783 N_Subprogram_Renaming_Declaration
))
1790 Fully_Conformant
, True, Conformant
, Body_Id
);
1793 -- If the body is not fully conformant, we have to decide if we
1794 -- should analyze it or not. If it has a really messed up profile
1795 -- then we probably should not analyze it, since we will get too
1796 -- many bogus messages.
1798 -- Our decision is to go ahead in the non-fully conformant case
1799 -- only if it is at least mode conformant with the spec. Note
1800 -- that the call to Check_Fully_Conformant has issued the proper
1801 -- error messages to complain about the lack of conformance.
1804 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
1810 if Spec_Id
/= Body_Id
then
1811 Reference_Body_Formals
(Spec_Id
, Body_Id
);
1814 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1815 Set_Corresponding_Spec
(N
, Spec_Id
);
1817 -- Ada 2005 (AI-345): If the operation is a primitive operation
1818 -- of a concurrent type, the type of the first parameter has been
1819 -- replaced with the corresponding record, which is the proper
1820 -- run-time structure to use. However, within the body there may
1821 -- be uses of the formals that depend on primitive operations
1822 -- of the type (in particular calls in prefixed form) for which
1823 -- we need the original concurrent type. The operation may have
1824 -- several controlling formals, so the replacement must be done
1827 if Comes_From_Source
(Spec_Id
)
1828 and then Present
(First_Entity
(Spec_Id
))
1829 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
1830 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
1832 Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
1835 (Corresponding_Concurrent_Type
1836 (Etype
(First_Entity
(Spec_Id
))))
1839 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
1843 Form
:= First_Formal
(Spec_Id
);
1844 while Present
(Form
) loop
1845 if Etype
(Form
) = Typ
then
1846 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
1854 -- Make the formals visible, and place subprogram on scope stack.
1855 -- This is also the point at which we set Last_Real_Spec_Entity
1856 -- to mark the entities which will not be moved to the body.
1858 Install_Formals
(Spec_Id
);
1859 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
1860 Push_Scope
(Spec_Id
);
1862 -- Make sure that the subprogram is immediately visible. For
1863 -- child units that have no separate spec this is indispensable.
1864 -- Otherwise it is safe albeit redundant.
1866 Set_Is_Immediately_Visible
(Spec_Id
);
1869 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
1870 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1871 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
1872 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
1874 -- Case of subprogram body with no previous spec
1878 and then Comes_From_Source
(Body_Id
)
1879 and then not Suppress_Style_Checks
(Body_Id
)
1880 and then not In_Instance
1882 Style
.Body_With_No_Spec
(N
);
1885 New_Overloaded_Entity
(Body_Id
);
1887 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1888 Set_Acts_As_Spec
(N
);
1889 Generate_Definition
(Body_Id
);
1891 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
1892 Generate_Reference_To_Formals
(Body_Id
);
1893 Install_Formals
(Body_Id
);
1894 Push_Scope
(Body_Id
);
1898 -- If the return type is an anonymous access type whose designated type
1899 -- is the limited view of a class-wide type and the non-limited view is
1900 -- available, update the return type accordingly.
1902 if Ada_Version
>= Ada_05
1903 and then Comes_From_Source
(N
)
1910 Rtyp
:= Etype
(Current_Scope
);
1912 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
1913 Etyp
:= Directly_Designated_Type
(Rtyp
);
1915 if Is_Class_Wide_Type
(Etyp
)
1916 and then From_With_Type
(Etyp
)
1918 Set_Directly_Designated_Type
1919 (Etype
(Current_Scope
), Available_View
(Etyp
));
1925 -- If this is the proper body of a stub, we must verify that the stub
1926 -- conforms to the body, and to the previous spec if one was present.
1927 -- we know already that the body conforms to that spec. This test is
1928 -- only required for subprograms that come from source.
1930 if Nkind
(Parent
(N
)) = N_Subunit
1931 and then Comes_From_Source
(N
)
1932 and then not Error_Posted
(Body_Id
)
1933 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
1934 N_Subprogram_Body_Stub
1937 Old_Id
: constant Entity_Id
:=
1939 (Specification
(Corresponding_Stub
(Parent
(N
))));
1941 Conformant
: Boolean := False;
1944 if No
(Spec_Id
) then
1945 Check_Fully_Conformant
(Body_Id
, Old_Id
);
1949 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
1951 if not Conformant
then
1953 -- The stub was taken to be a new declaration. Indicate
1954 -- that it lacks a body.
1956 Set_Has_Completion
(Old_Id
, False);
1962 Set_Has_Completion
(Body_Id
);
1963 Check_Eliminated
(Body_Id
);
1965 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1968 elsif Present
(Spec_Id
)
1969 and then Expander_Active
1971 (Has_Pragma_Inline_Always
(Spec_Id
)
1972 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
))
1974 Build_Body_To_Inline
(N
, Spec_Id
);
1977 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
1978 -- if its specification we have to install the private withed units.
1979 -- This holds for child units as well.
1981 if Is_Compilation_Unit
(Body_Id
)
1982 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
1984 Install_Private_With_Clauses
(Body_Id
);
1987 Check_Anonymous_Return
;
1989 -- Set the Protected_Formal field of each extra formal of the protected
1990 -- subprogram to reference the corresponding extra formal of the
1991 -- subprogram that implements it. For regular formals this occurs when
1992 -- the protected subprogram's declaration is expanded, but the extra
1993 -- formals don't get created until the subprogram is frozen. We need to
1994 -- do this before analyzing the protected subprogram's body so that any
1995 -- references to the original subprogram's extra formals will be changed
1996 -- refer to the implementing subprogram's formals (see Expand_Formal).
1998 if Present
(Spec_Id
)
1999 and then Is_Protected_Type
(Scope
(Spec_Id
))
2000 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
2003 Impl_Subp
: constant Entity_Id
:=
2004 Protected_Body_Subprogram
(Spec_Id
);
2005 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
2006 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
2008 while Present
(Prot_Ext_Formal
) loop
2009 pragma Assert
(Present
(Impl_Ext_Formal
));
2010 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
2011 Next_Formal_With_Extras
(Prot_Ext_Formal
);
2012 Next_Formal_With_Extras
(Impl_Ext_Formal
);
2017 -- Now we can go on to analyze the body
2019 HSS
:= Handled_Statement_Sequence
(N
);
2020 Set_Actual_Subtypes
(N
, Current_Scope
);
2022 -- Deal with preconditions and postconditions
2024 Process_PPCs
(N
, Spec_Id
, Body_Id
);
2026 -- Add a declaration for the Protection object, renaming declarations
2027 -- for discriminals and privals and finally a declaration for the entry
2028 -- family index (if applicable). This form of early expansion is done
2029 -- when the Expander is active because Install_Private_Data_Declarations
2030 -- references entities which were created during regular expansion.
2033 and then Comes_From_Source
(N
)
2034 and then Present
(Prot_Typ
)
2035 and then Present
(Spec_Id
)
2036 and then not Is_Eliminated
(Spec_Id
)
2038 Install_Private_Data_Declarations
2039 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
2042 -- Analyze the declarations (this call will analyze the precondition
2043 -- Check pragmas we prepended to the list, as well as the declaration
2044 -- of the _Postconditions procedure).
2046 Analyze_Declarations
(Declarations
(N
));
2048 -- Check completion, and analyze the statements
2051 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
2054 -- Deal with end of scope processing for the body
2056 Process_End_Label
(HSS
, 't', Current_Scope
);
2058 Check_Subprogram_Order
(N
);
2059 Set_Analyzed
(Body_Id
);
2061 -- If we have a separate spec, then the analysis of the declarations
2062 -- caused the entities in the body to be chained to the spec id, but
2063 -- we want them chained to the body id. Only the formal parameters
2064 -- end up chained to the spec id in this case.
2066 if Present
(Spec_Id
) then
2068 -- We must conform to the categorization of our spec
2070 Validate_Categorization_Dependency
(N
, Spec_Id
);
2072 -- And if this is a child unit, the parent units must conform
2074 if Is_Child_Unit
(Spec_Id
) then
2075 Validate_Categorization_Dependency
2076 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
2079 -- Here is where we move entities from the spec to the body
2081 -- Case where there are entities that stay with the spec
2083 if Present
(Last_Real_Spec_Entity
) then
2085 -- No body entities (happens when the only real spec entities
2086 -- come from precondition and postcondition pragmas)
2088 if No
(Last_Entity
(Body_Id
)) then
2090 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
2092 -- Body entities present (formals), so chain stuff past them
2096 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
2099 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
2100 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2101 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
2103 -- Case where there are no spec entities, in this case there can
2104 -- be no body entities either, so just move everything.
2107 pragma Assert
(No
(Last_Entity
(Body_Id
)));
2108 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
2109 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2110 Set_First_Entity
(Spec_Id
, Empty
);
2111 Set_Last_Entity
(Spec_Id
, Empty
);
2115 -- If function, check return statements
2117 if Nkind
(Body_Spec
) = N_Function_Specification
then
2122 if Present
(Spec_Id
) then
2128 if Return_Present
(Id
) then
2129 Check_Returns
(HSS
, 'F', Missing_Ret
);
2132 Set_Has_Missing_Return
(Id
);
2135 elsif not Is_Machine_Code_Subprogram
(Id
)
2136 and then not Body_Deleted
2138 Error_Msg_N
("missing RETURN statement in function body", N
);
2142 -- If procedure with No_Return, check returns
2144 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2145 and then Present
(Spec_Id
)
2146 and then No_Return
(Spec_Id
)
2148 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2151 -- Now we are going to check for variables that are never modified in
2152 -- the body of the procedure. But first we deal with a special case
2153 -- where we want to modify this check. If the body of the subprogram
2154 -- starts with a raise statement or its equivalent, or if the body
2155 -- consists entirely of a null statement, then it is pretty obvious
2156 -- that it is OK to not reference the parameters. For example, this
2157 -- might be the following common idiom for a stubbed function:
2158 -- statement of the procedure raises an exception. In particular this
2159 -- deals with the common idiom of a stubbed function, which might
2160 -- appear as something like
2162 -- function F (A : Integer) return Some_Type;
2165 -- raise Program_Error;
2169 -- Here the purpose of X is simply to satisfy the annoying requirement
2170 -- in Ada that there be at least one return, and we certainly do not
2171 -- want to go posting warnings on X that it is not initialized! On
2172 -- the other hand, if X is entirely unreferenced that should still
2175 -- What we do is to detect these cases, and if we find them, flag the
2176 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2177 -- suppress unwanted warnings. For the case of the function stub above
2178 -- we have a special test to set X as apparently assigned to suppress
2185 -- Skip initial labels (for one thing this occurs when we are in
2186 -- front end ZCX mode, but in any case it is irrelevant), and also
2187 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2189 Stm
:= First
(Statements
(HSS
));
2190 while Nkind
(Stm
) = N_Label
2191 or else Nkind
(Stm
) in N_Push_xxx_Label
2196 -- Do the test on the original statement before expansion
2199 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
2202 -- If explicit raise statement, turn on flag
2204 if Nkind
(Ostm
) = N_Raise_Statement
then
2205 Set_Trivial_Subprogram
(Stm
);
2207 -- If null statement, and no following statements, turn on flag
2209 elsif Nkind
(Stm
) = N_Null_Statement
2210 and then Comes_From_Source
(Stm
)
2211 and then No
(Next
(Stm
))
2213 Set_Trivial_Subprogram
(Stm
);
2215 -- Check for explicit call cases which likely raise an exception
2217 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
2218 if Is_Entity_Name
(Name
(Ostm
)) then
2220 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
2223 -- If the procedure is marked No_Return, then likely it
2224 -- raises an exception, but in any case it is not coming
2225 -- back here, so turn on the flag.
2227 if Ekind
(Ent
) = E_Procedure
2228 and then No_Return
(Ent
)
2230 Set_Trivial_Subprogram
(Stm
);
2232 -- If the procedure name is Raise_Exception, then also
2233 -- assume that it raises an exception. The main target
2234 -- here is Ada.Exceptions.Raise_Exception, but this name
2235 -- is pretty evocative in any context! Note that the
2236 -- procedure in Ada.Exceptions is not marked No_Return
2237 -- because of the annoying case of the null exception Id
2238 -- when operating in Ada 95 mode.
2240 elsif Chars
(Ent
) = Name_Raise_Exception
then
2241 Set_Trivial_Subprogram
(Stm
);
2249 -- Check for variables that are never modified
2255 -- If there is a separate spec, then transfer Never_Set_In_Source
2256 -- flags from out parameters to the corresponding entities in the
2257 -- body. The reason we do that is we want to post error flags on
2258 -- the body entities, not the spec entities.
2260 if Present
(Spec_Id
) then
2261 E1
:= First_Entity
(Spec_Id
);
2262 while Present
(E1
) loop
2263 if Ekind
(E1
) = E_Out_Parameter
then
2264 E2
:= First_Entity
(Body_Id
);
2265 while Present
(E2
) loop
2266 exit when Chars
(E1
) = Chars
(E2
);
2270 if Present
(E2
) then
2271 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
2279 -- Check references in body unless it was deleted. Note that the
2280 -- check of Body_Deleted here is not just for efficiency, it is
2281 -- necessary to avoid junk warnings on formal parameters.
2283 if not Body_Deleted
then
2284 Check_References
(Body_Id
);
2287 end Analyze_Subprogram_Body
;
2289 ------------------------------------
2290 -- Analyze_Subprogram_Declaration --
2291 ------------------------------------
2293 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
2294 Designator
: constant Entity_Id
:=
2295 Analyze_Subprogram_Specification
(Specification
(N
));
2296 Scop
: constant Entity_Id
:= Current_Scope
;
2298 -- Start of processing for Analyze_Subprogram_Declaration
2301 Generate_Definition
(Designator
);
2303 -- Check for RCI unit subprogram declarations for illegal inlined
2304 -- subprograms and subprograms having access parameter or limited
2305 -- parameter without Read and Write attributes (RM E.2.3(12-13)).
2307 Validate_RCI_Subprogram_Declaration
(N
);
2311 Defining_Entity
(N
),
2312 " Analyze subprogram spec: ");
2314 if Debug_Flag_C
then
2315 Write_Str
("==== Compiling subprogram spec ");
2316 Write_Name
(Chars
(Designator
));
2317 Write_Str
(" from ");
2318 Write_Location
(Sloc
(N
));
2322 New_Overloaded_Entity
(Designator
);
2323 Check_Delayed_Subprogram
(Designator
);
2325 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2328 if Ada_Version
>= Ada_05
2329 and then Comes_From_Source
(N
)
2330 and then Is_Dispatching_Operation
(Designator
)
2337 if Has_Controlling_Result
(Designator
) then
2338 Etyp
:= Etype
(Designator
);
2341 E
:= First_Entity
(Designator
);
2343 and then Is_Formal
(E
)
2344 and then not Is_Controlling_Formal
(E
)
2352 if Is_Access_Type
(Etyp
) then
2353 Etyp
:= Directly_Designated_Type
(Etyp
);
2356 if Is_Interface
(Etyp
)
2357 and then not Is_Abstract_Subprogram
(Designator
)
2358 and then not (Ekind
(Designator
) = E_Procedure
2359 and then Null_Present
(Specification
(N
)))
2361 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
2363 ("(Ada 2005) interface subprogram % must be abstract or null",
2369 -- What is the following code for, it used to be
2371 -- ??? Set_Suppress_Elaboration_Checks
2372 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2374 -- The following seems equivalent, but a bit dubious
2376 if Elaboration_Checks_Suppressed
(Designator
) then
2377 Set_Kill_Elaboration_Checks
(Designator
);
2380 if Scop
/= Standard_Standard
2381 and then not Is_Child_Unit
(Designator
)
2383 Set_Categorization_From_Scope
(Designator
, Scop
);
2385 -- For a compilation unit, check for library-unit pragmas
2387 Push_Scope
(Designator
);
2388 Set_Categorization_From_Pragmas
(N
);
2389 Validate_Categorization_Dependency
(N
, Designator
);
2393 -- For a compilation unit, set body required. This flag will only be
2394 -- reset if a valid Import or Interface pragma is processed later on.
2396 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2397 Set_Body_Required
(Parent
(N
), True);
2399 if Ada_Version
>= Ada_05
2400 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
2401 and then Null_Present
(Specification
(N
))
2404 ("null procedure cannot be declared at library level", N
);
2408 Generate_Reference_To_Formals
(Designator
);
2409 Check_Eliminated
(Designator
);
2411 -- Ada 2005: if procedure is declared with "is null" qualifier,
2412 -- it requires no body.
2414 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2415 and then Null_Present
(Specification
(N
))
2417 Set_Has_Completion
(Designator
);
2418 Set_Is_Inlined
(Designator
);
2420 if Is_Protected_Type
(Current_Scope
) then
2422 ("protected operation cannot be a null procedure", N
);
2425 end Analyze_Subprogram_Declaration
;
2427 --------------------------------------
2428 -- Analyze_Subprogram_Specification --
2429 --------------------------------------
2431 -- Reminder: N here really is a subprogram specification (not a subprogram
2432 -- declaration). This procedure is called to analyze the specification in
2433 -- both subprogram bodies and subprogram declarations (specs).
2435 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
2436 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2437 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
2439 Formal_Typ
: Entity_Id
;
2441 -- Start of processing for Analyze_Subprogram_Specification
2444 Generate_Definition
(Designator
);
2446 if Nkind
(N
) = N_Function_Specification
then
2447 Set_Ekind
(Designator
, E_Function
);
2448 Set_Mechanism
(Designator
, Default_Mechanism
);
2451 Set_Ekind
(Designator
, E_Procedure
);
2452 Set_Etype
(Designator
, Standard_Void_Type
);
2455 -- Introduce new scope for analysis of the formals and the return type
2457 Set_Scope
(Designator
, Current_Scope
);
2459 if Present
(Formals
) then
2460 Push_Scope
(Designator
);
2461 Process_Formals
(Formals
, N
);
2463 -- Ada 2005 (AI-345): If this is an overriding operation of an
2464 -- inherited interface operation, and the controlling type is
2465 -- a synchronized type, replace the type with its corresponding
2466 -- record, to match the proper signature of an overriding operation.
2468 if Ada_Version
>= Ada_05
then
2469 Formal
:= First_Formal
(Designator
);
2470 while Present
(Formal
) loop
2471 Formal_Typ
:= Etype
(Formal
);
2473 if Is_Concurrent_Type
(Formal_Typ
)
2474 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2475 and then Present
(Interfaces
2476 (Corresponding_Record_Type
(Formal_Typ
)))
2479 Corresponding_Record_Type
(Formal_Typ
));
2482 Formal
:= Next_Formal
(Formal
);
2488 elsif Nkind
(N
) = N_Function_Specification
then
2489 Analyze_Return_Type
(N
);
2492 if Nkind
(N
) = N_Function_Specification
then
2493 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
2494 Valid_Operator_Definition
(Designator
);
2497 May_Need_Actuals
(Designator
);
2499 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2500 -- the subprogram is abstract also. This does not apply to renaming
2501 -- declarations, where abstractness is inherited.
2502 -- In case of primitives associated with abstract interface types
2503 -- the check is applied later (see Analyze_Subprogram_Declaration).
2505 if Is_Abstract_Type
(Etype
(Designator
))
2506 and then not Is_Interface
(Etype
(Designator
))
2507 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
2508 and then Nkind
(Parent
(N
)) /=
2509 N_Abstract_Subprogram_Declaration
2511 (Nkind
(Parent
(N
))) /= N_Formal_Abstract_Subprogram_Declaration
2514 ("function that returns abstract type must be abstract", N
);
2519 end Analyze_Subprogram_Specification
;
2521 --------------------------
2522 -- Build_Body_To_Inline --
2523 --------------------------
2525 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
) is
2526 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
2527 Original_Body
: Node_Id
;
2528 Body_To_Analyze
: Node_Id
;
2529 Max_Size
: constant := 10;
2530 Stat_Count
: Integer := 0;
2532 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean;
2533 -- Check for declarations that make inlining not worthwhile
2535 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean;
2536 -- Check for statements that make inlining not worthwhile: any tasking
2537 -- statement, nested at any level. Keep track of total number of
2538 -- elementary statements, as a measure of acceptable size.
2540 function Has_Pending_Instantiation
return Boolean;
2541 -- If some enclosing body contains instantiations that appear before the
2542 -- corresponding generic body, the enclosing body has a freeze node so
2543 -- that it can be elaborated after the generic itself. This might
2544 -- conflict with subsequent inlinings, so that it is unsafe to try to
2545 -- inline in such a case.
2547 function Has_Single_Return
return Boolean;
2548 -- In general we cannot inline functions that return unconstrained type.
2549 -- However, we can handle such functions if all return statements return
2550 -- a local variable that is the only declaration in the body of the
2551 -- function. In that case the call can be replaced by that local
2552 -- variable as is done for other inlined calls.
2554 procedure Remove_Pragmas
;
2555 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2556 -- parameter has no meaning when the body is inlined and the formals
2557 -- are rewritten. Remove it from body to inline. The analysis of the
2558 -- non-inlined body will handle the pragma properly.
2560 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean;
2561 -- If the body of the subprogram includes a call that returns an
2562 -- unconstrained type, the secondary stack is involved, and it
2563 -- is not worth inlining.
2565 ------------------------------
2566 -- Has_Excluded_Declaration --
2567 ------------------------------
2569 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean is
2572 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean;
2573 -- Nested subprograms make a given body ineligible for inlining, but
2574 -- we make an exception for instantiations of unchecked conversion.
2575 -- The body has not been analyzed yet, so check the name, and verify
2576 -- that the visible entity with that name is the predefined unit.
2578 -----------------------------
2579 -- Is_Unchecked_Conversion --
2580 -----------------------------
2582 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean is
2583 Id
: constant Node_Id
:= Name
(D
);
2587 if Nkind
(Id
) = N_Identifier
2588 and then Chars
(Id
) = Name_Unchecked_Conversion
2590 Conv
:= Current_Entity
(Id
);
2592 elsif Nkind_In
(Id
, N_Selected_Component
, N_Expanded_Name
)
2593 and then Chars
(Selector_Name
(Id
)) = Name_Unchecked_Conversion
2595 Conv
:= Current_Entity
(Selector_Name
(Id
));
2600 return Present
(Conv
)
2601 and then Is_Predefined_File_Name
2602 (Unit_File_Name
(Get_Source_Unit
(Conv
)))
2603 and then Is_Intrinsic_Subprogram
(Conv
);
2604 end Is_Unchecked_Conversion
;
2606 -- Start of processing for Has_Excluded_Declaration
2610 while Present
(D
) loop
2611 if (Nkind
(D
) = N_Function_Instantiation
2612 and then not Is_Unchecked_Conversion
(D
))
2613 or else Nkind_In
(D
, N_Protected_Type_Declaration
,
2614 N_Package_Declaration
,
2615 N_Package_Instantiation
,
2617 N_Procedure_Instantiation
,
2618 N_Task_Type_Declaration
)
2621 ("cannot inline & (non-allowed declaration)?", D
, Subp
);
2629 end Has_Excluded_Declaration
;
2631 ----------------------------
2632 -- Has_Excluded_Statement --
2633 ----------------------------
2635 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean is
2641 while Present
(S
) loop
2642 Stat_Count
:= Stat_Count
+ 1;
2644 if Nkind_In
(S
, N_Abort_Statement
,
2645 N_Asynchronous_Select
,
2646 N_Conditional_Entry_Call
,
2647 N_Delay_Relative_Statement
,
2648 N_Delay_Until_Statement
,
2653 ("cannot inline & (non-allowed statement)?", S
, Subp
);
2656 elsif Nkind
(S
) = N_Block_Statement
then
2657 if Present
(Declarations
(S
))
2658 and then Has_Excluded_Declaration
(Declarations
(S
))
2662 elsif Present
(Handled_Statement_Sequence
(S
))
2665 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
2667 Has_Excluded_Statement
2668 (Statements
(Handled_Statement_Sequence
(S
))))
2673 elsif Nkind
(S
) = N_Case_Statement
then
2674 E
:= First
(Alternatives
(S
));
2675 while Present
(E
) loop
2676 if Has_Excluded_Statement
(Statements
(E
)) then
2683 elsif Nkind
(S
) = N_If_Statement
then
2684 if Has_Excluded_Statement
(Then_Statements
(S
)) then
2688 if Present
(Elsif_Parts
(S
)) then
2689 E
:= First
(Elsif_Parts
(S
));
2690 while Present
(E
) loop
2691 if Has_Excluded_Statement
(Then_Statements
(E
)) then
2698 if Present
(Else_Statements
(S
))
2699 and then Has_Excluded_Statement
(Else_Statements
(S
))
2704 elsif Nkind
(S
) = N_Loop_Statement
2705 and then Has_Excluded_Statement
(Statements
(S
))
2714 end Has_Excluded_Statement
;
2716 -------------------------------
2717 -- Has_Pending_Instantiation --
2718 -------------------------------
2720 function Has_Pending_Instantiation
return Boolean is
2725 while Present
(S
) loop
2726 if Is_Compilation_Unit
(S
)
2727 or else Is_Child_Unit
(S
)
2730 elsif Ekind
(S
) = E_Package
2731 and then Has_Forward_Instantiation
(S
)
2740 end Has_Pending_Instantiation
;
2742 ------------------------
2743 -- Has_Single_Return --
2744 ------------------------
2746 function Has_Single_Return
return Boolean is
2747 Return_Statement
: Node_Id
:= Empty
;
2749 function Check_Return
(N
: Node_Id
) return Traverse_Result
;
2755 function Check_Return
(N
: Node_Id
) return Traverse_Result
is
2757 if Nkind
(N
) = N_Simple_Return_Statement
then
2758 if Present
(Expression
(N
))
2759 and then Is_Entity_Name
(Expression
(N
))
2761 if No
(Return_Statement
) then
2762 Return_Statement
:= N
;
2765 elsif Chars
(Expression
(N
)) =
2766 Chars
(Expression
(Return_Statement
))
2775 -- Expression has wrong form
2785 function Check_All_Returns
is new Traverse_Func
(Check_Return
);
2787 -- Start of processing for Has_Single_Return
2790 return Check_All_Returns
(N
) = OK
2791 and then Present
(Declarations
(N
))
2792 and then Present
(First
(Declarations
(N
)))
2793 and then Chars
(Expression
(Return_Statement
)) =
2794 Chars
(Defining_Identifier
(First
(Declarations
(N
))));
2795 end Has_Single_Return
;
2797 --------------------
2798 -- Remove_Pragmas --
2799 --------------------
2801 procedure Remove_Pragmas
is
2806 Decl
:= First
(Declarations
(Body_To_Analyze
));
2807 while Present
(Decl
) loop
2810 if Nkind
(Decl
) = N_Pragma
2811 and then (Pragma_Name
(Decl
) = Name_Unreferenced
2813 Pragma_Name
(Decl
) = Name_Unmodified
)
2822 --------------------------
2823 -- Uses_Secondary_Stack --
2824 --------------------------
2826 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean is
2827 function Check_Call
(N
: Node_Id
) return Traverse_Result
;
2828 -- Look for function calls that return an unconstrained type
2834 function Check_Call
(N
: Node_Id
) return Traverse_Result
is
2836 if Nkind
(N
) = N_Function_Call
2837 and then Is_Entity_Name
(Name
(N
))
2838 and then Is_Composite_Type
(Etype
(Entity
(Name
(N
))))
2839 and then not Is_Constrained
(Etype
(Entity
(Name
(N
))))
2842 ("cannot inline & (call returns unconstrained type)?",
2850 function Check_Calls
is new Traverse_Func
(Check_Call
);
2853 return Check_Calls
(Bod
) = Abandon
;
2854 end Uses_Secondary_Stack
;
2856 -- Start of processing for Build_Body_To_Inline
2859 if Nkind
(Decl
) = N_Subprogram_Declaration
2860 and then Present
(Body_To_Inline
(Decl
))
2862 return; -- Done already.
2864 -- Functions that return unconstrained composite types require
2865 -- secondary stack handling, and cannot currently be inlined, unless
2866 -- all return statements return a local variable that is the first
2867 -- local declaration in the body.
2869 elsif Ekind
(Subp
) = E_Function
2870 and then not Is_Scalar_Type
(Etype
(Subp
))
2871 and then not Is_Access_Type
(Etype
(Subp
))
2872 and then not Is_Constrained
(Etype
(Subp
))
2874 if not Has_Single_Return
then
2876 ("cannot inline & (unconstrained return type)?", N
, Subp
);
2880 -- Ditto for functions that return controlled types, where controlled
2881 -- actions interfere in complex ways with inlining.
2883 elsif Ekind
(Subp
) = E_Function
2884 and then Controlled_Type
(Etype
(Subp
))
2887 ("cannot inline & (controlled return type)?", N
, Subp
);
2891 if Present
(Declarations
(N
))
2892 and then Has_Excluded_Declaration
(Declarations
(N
))
2897 if Present
(Handled_Statement_Sequence
(N
)) then
2898 if Present
(Exception_Handlers
(Handled_Statement_Sequence
(N
))) then
2900 ("cannot inline& (exception handler)?",
2901 First
(Exception_Handlers
(Handled_Statement_Sequence
(N
))),
2905 Has_Excluded_Statement
2906 (Statements
(Handled_Statement_Sequence
(N
)))
2912 -- We do not inline a subprogram that is too large, unless it is
2913 -- marked Inline_Always. This pragma does not suppress the other
2914 -- checks on inlining (forbidden declarations, handlers, etc).
2916 if Stat_Count
> Max_Size
2917 and then not Has_Pragma_Inline_Always
(Subp
)
2919 Cannot_Inline
("cannot inline& (body too large)?", N
, Subp
);
2923 if Has_Pending_Instantiation
then
2925 ("cannot inline& (forward instance within enclosing body)?",
2930 -- Within an instance, the body to inline must be treated as a nested
2931 -- generic, so that the proper global references are preserved.
2933 -- Note that we do not do this at the library level, because it is not
2934 -- needed, and furthermore this causes trouble if front end inlining
2935 -- is activated (-gnatN).
2937 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
2938 Save_Env
(Scope
(Current_Scope
), Scope
(Current_Scope
));
2939 Original_Body
:= Copy_Generic_Node
(N
, Empty
, True);
2941 Original_Body
:= Copy_Separate_Tree
(N
);
2944 -- We need to capture references to the formals in order to substitute
2945 -- the actuals at the point of inlining, i.e. instantiation. To treat
2946 -- the formals as globals to the body to inline, we nest it within
2947 -- a dummy parameterless subprogram, declared within the real one.
2948 -- To avoid generating an internal name (which is never public, and
2949 -- which affects serial numbers of other generated names), we use
2950 -- an internal symbol that cannot conflict with user declarations.
2952 Set_Parameter_Specifications
(Specification
(Original_Body
), No_List
);
2953 Set_Defining_Unit_Name
2954 (Specification
(Original_Body
),
2955 Make_Defining_Identifier
(Sloc
(N
), Name_uParent
));
2956 Set_Corresponding_Spec
(Original_Body
, Empty
);
2958 Body_To_Analyze
:= Copy_Generic_Node
(Original_Body
, Empty
, False);
2960 -- Set return type of function, which is also global and does not need
2963 if Ekind
(Subp
) = E_Function
then
2964 Set_Result_Definition
(Specification
(Body_To_Analyze
),
2965 New_Occurrence_Of
(Etype
(Subp
), Sloc
(N
)));
2968 if No
(Declarations
(N
)) then
2969 Set_Declarations
(N
, New_List
(Body_To_Analyze
));
2971 Append
(Body_To_Analyze
, Declarations
(N
));
2974 Expander_Mode_Save_And_Set
(False);
2977 Analyze
(Body_To_Analyze
);
2978 Push_Scope
(Defining_Entity
(Body_To_Analyze
));
2979 Save_Global_References
(Original_Body
);
2981 Remove
(Body_To_Analyze
);
2983 Expander_Mode_Restore
;
2985 -- Restore environment if previously saved
2987 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
2991 -- If secondary stk used there is no point in inlining. We have
2992 -- already issued the warning in this case, so nothing to do.
2994 if Uses_Secondary_Stack
(Body_To_Analyze
) then
2998 Set_Body_To_Inline
(Decl
, Original_Body
);
2999 Set_Ekind
(Defining_Entity
(Original_Body
), Ekind
(Subp
));
3000 Set_Is_Inlined
(Subp
);
3001 end Build_Body_To_Inline
;
3007 procedure Cannot_Inline
(Msg
: String; N
: Node_Id
; Subp
: Entity_Id
) is
3009 -- Do not emit warning if this is a predefined unit which is not
3010 -- the main unit. With validity checks enabled, some predefined
3011 -- subprograms may contain nested subprograms and become ineligible
3014 if Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(Subp
)))
3015 and then not In_Extended_Main_Source_Unit
(Subp
)
3019 elsif Has_Pragma_Inline_Always
(Subp
) then
3021 -- Remove last character (question mark) to make this into an error,
3022 -- because the Inline_Always pragma cannot be obeyed.
3024 Error_Msg_NE
(Msg
(Msg
'First .. Msg
'Last - 1), N
, Subp
);
3026 elsif Ineffective_Inline_Warnings
then
3027 Error_Msg_NE
(Msg
, N
, Subp
);
3031 -----------------------
3032 -- Check_Conformance --
3033 -----------------------
3035 procedure Check_Conformance
3036 (New_Id
: Entity_Id
;
3038 Ctype
: Conformance_Type
;
3040 Conforms
: out Boolean;
3041 Err_Loc
: Node_Id
:= Empty
;
3042 Get_Inst
: Boolean := False;
3043 Skip_Controlling_Formals
: Boolean := False)
3045 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
3046 -- Post error message for conformance error on given node. Two messages
3047 -- are output. The first points to the previous declaration with a
3048 -- general "no conformance" message. The second is the detailed reason,
3049 -- supplied as Msg. The parameter N provide information for a possible
3050 -- & insertion in the message, and also provides the location for
3051 -- posting the message in the absence of a specified Err_Loc location.
3053 -----------------------
3054 -- Conformance_Error --
3055 -----------------------
3057 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
3064 if No
(Err_Loc
) then
3070 Error_Msg_Sloc
:= Sloc
(Old_Id
);
3073 when Type_Conformant
=>
3075 ("not type conformant with declaration#!", Enode
);
3077 when Mode_Conformant
=>
3078 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3080 ("not mode conformant with operation inherited#!",
3084 ("not mode conformant with declaration#!", Enode
);
3087 when Subtype_Conformant
=>
3088 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3090 ("not subtype conformant with operation inherited#!",
3094 ("not subtype conformant with declaration#!", Enode
);
3097 when Fully_Conformant
=>
3098 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3100 ("not fully conformant with operation inherited#!",
3104 ("not fully conformant with declaration#!", Enode
);
3108 Error_Msg_NE
(Msg
, Enode
, N
);
3110 end Conformance_Error
;
3114 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
3115 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
3116 Old_Formal
: Entity_Id
;
3117 New_Formal
: Entity_Id
;
3118 Access_Types_Match
: Boolean;
3119 Old_Formal_Base
: Entity_Id
;
3120 New_Formal_Base
: Entity_Id
;
3122 -- Start of processing for Check_Conformance
3127 -- We need a special case for operators, since they don't appear
3130 if Ctype
= Type_Conformant
then
3131 if Ekind
(New_Id
) = E_Operator
3132 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
3138 -- If both are functions/operators, check return types conform
3140 if Old_Type
/= Standard_Void_Type
3141 and then New_Type
/= Standard_Void_Type
3144 -- If we are checking interface conformance we omit controlling
3145 -- arguments and result, because we are only checking the conformance
3146 -- of the remaining parameters.
3148 if Has_Controlling_Result
(Old_Id
)
3149 and then Has_Controlling_Result
(New_Id
)
3150 and then Skip_Controlling_Formals
3154 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
3155 Conformance_Error
("\return type does not match!", New_Id
);
3159 -- Ada 2005 (AI-231): In case of anonymous access types check the
3160 -- null-exclusion and access-to-constant attributes match.
3162 if Ada_Version
>= Ada_05
3163 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
3165 (Can_Never_Be_Null
(Old_Type
)
3166 /= Can_Never_Be_Null
(New_Type
)
3167 or else Is_Access_Constant
(Etype
(Old_Type
))
3168 /= Is_Access_Constant
(Etype
(New_Type
)))
3170 Conformance_Error
("\return type does not match!", New_Id
);
3174 -- If either is a function/operator and the other isn't, error
3176 elsif Old_Type
/= Standard_Void_Type
3177 or else New_Type
/= Standard_Void_Type
3179 Conformance_Error
("\functions can only match functions!", New_Id
);
3183 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3184 -- If this is a renaming as body, refine error message to indicate that
3185 -- the conflict is with the original declaration. If the entity is not
3186 -- frozen, the conventions don't have to match, the one of the renamed
3187 -- entity is inherited.
3189 if Ctype
>= Subtype_Conformant
then
3190 if Convention
(Old_Id
) /= Convention
(New_Id
) then
3192 if not Is_Frozen
(New_Id
) then
3195 elsif Present
(Err_Loc
)
3196 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
3197 and then Present
(Corresponding_Spec
(Err_Loc
))
3199 Error_Msg_Name_1
:= Chars
(New_Id
);
3201 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
3203 Conformance_Error
("\prior declaration for% has convention %!");
3206 Conformance_Error
("\calling conventions do not match!");
3211 elsif Is_Formal_Subprogram
(Old_Id
)
3212 or else Is_Formal_Subprogram
(New_Id
)
3214 Conformance_Error
("\formal subprograms not allowed!");
3219 -- Deal with parameters
3221 -- Note: we use the entity information, rather than going directly
3222 -- to the specification in the tree. This is not only simpler, but
3223 -- absolutely necessary for some cases of conformance tests between
3224 -- operators, where the declaration tree simply does not exist!
3226 Old_Formal
:= First_Formal
(Old_Id
);
3227 New_Formal
:= First_Formal
(New_Id
);
3229 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
3230 if Is_Controlling_Formal
(Old_Formal
)
3231 and then Is_Controlling_Formal
(New_Formal
)
3232 and then Skip_Controlling_Formals
3234 goto Skip_Controlling_Formal
;
3237 if Ctype
= Fully_Conformant
then
3239 -- Names must match. Error message is more accurate if we do
3240 -- this before checking that the types of the formals match.
3242 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
3243 Conformance_Error
("\name & does not match!", New_Formal
);
3245 -- Set error posted flag on new formal as well to stop
3246 -- junk cascaded messages in some cases.
3248 Set_Error_Posted
(New_Formal
);
3253 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3254 -- case occurs whenever a subprogram is being renamed and one of its
3255 -- parameters imposes a null exclusion. For example:
3257 -- type T is null record;
3258 -- type Acc_T is access T;
3259 -- subtype Acc_T_Sub is Acc_T;
3261 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3262 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3265 Old_Formal_Base
:= Etype
(Old_Formal
);
3266 New_Formal_Base
:= Etype
(New_Formal
);
3269 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
3270 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
3273 Access_Types_Match
:= Ada_Version
>= Ada_05
3275 -- Ensure that this rule is only applied when New_Id is a
3276 -- renaming of Old_Id.
3278 and then Nkind
(Parent
(Parent
(New_Id
))) =
3279 N_Subprogram_Renaming_Declaration
3280 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
3281 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
3282 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
3284 -- Now handle the allowed access-type case
3286 and then Is_Access_Type
(Old_Formal_Base
)
3287 and then Is_Access_Type
(New_Formal_Base
)
3289 -- The type kinds must match. The only exception occurs with
3290 -- multiple generics of the form:
3293 -- type F is private; type A is private;
3294 -- type F_Ptr is access F; type A_Ptr is access A;
3295 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3296 -- package F_Pack is ... package A_Pack is
3297 -- package F_Inst is
3298 -- new F_Pack (A, A_Ptr, A_P);
3300 -- When checking for conformance between the parameters of A_P
3301 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3302 -- because the compiler has transformed A_Ptr into a subtype of
3303 -- F_Ptr. We catch this case in the code below.
3305 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
3307 (Is_Generic_Type
(Old_Formal_Base
)
3308 and then Is_Generic_Type
(New_Formal_Base
)
3309 and then Is_Internal
(New_Formal_Base
)
3310 and then Etype
(Etype
(New_Formal_Base
)) =
3312 and then Directly_Designated_Type
(Old_Formal_Base
) =
3313 Directly_Designated_Type
(New_Formal_Base
)
3314 and then ((Is_Itype
(Old_Formal_Base
)
3315 and then Can_Never_Be_Null
(Old_Formal_Base
))
3317 (Is_Itype
(New_Formal_Base
)
3318 and then Can_Never_Be_Null
(New_Formal_Base
)));
3320 -- Types must always match. In the visible part of an instance,
3321 -- usual overloading rules for dispatching operations apply, and
3322 -- we check base types (not the actual subtypes).
3324 if In_Instance_Visible_Part
3325 and then Is_Dispatching_Operation
(New_Id
)
3327 if not Conforming_Types
3328 (T1
=> Base_Type
(Etype
(Old_Formal
)),
3329 T2
=> Base_Type
(Etype
(New_Formal
)),
3331 Get_Inst
=> Get_Inst
)
3332 and then not Access_Types_Match
3334 Conformance_Error
("\type of & does not match!", New_Formal
);
3338 elsif not Conforming_Types
3339 (T1
=> Old_Formal_Base
,
3340 T2
=> New_Formal_Base
,
3342 Get_Inst
=> Get_Inst
)
3343 and then not Access_Types_Match
3345 Conformance_Error
("\type of & does not match!", New_Formal
);
3349 -- For mode conformance, mode must match
3351 if Ctype
>= Mode_Conformant
then
3352 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
3353 Conformance_Error
("\mode of & does not match!", New_Formal
);
3356 -- Part of mode conformance for access types is having the same
3357 -- constant modifier.
3359 elsif Access_Types_Match
3360 and then Is_Access_Constant
(Old_Formal_Base
) /=
3361 Is_Access_Constant
(New_Formal_Base
)
3364 ("\constant modifier does not match!", New_Formal
);
3369 if Ctype
>= Subtype_Conformant
then
3371 -- Ada 2005 (AI-231): In case of anonymous access types check
3372 -- the null-exclusion and access-to-constant attributes must
3375 if Ada_Version
>= Ada_05
3376 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
3377 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
3379 (Can_Never_Be_Null
(Old_Formal
) /=
3380 Can_Never_Be_Null
(New_Formal
)
3382 Is_Access_Constant
(Etype
(Old_Formal
)) /=
3383 Is_Access_Constant
(Etype
(New_Formal
)))
3385 -- It is allowed to omit the null-exclusion in case of stream
3386 -- attribute subprograms. We recognize stream subprograms
3387 -- through their TSS-generated suffix.
3390 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
3392 if TSS_Name
/= TSS_Stream_Read
3393 and then TSS_Name
/= TSS_Stream_Write
3394 and then TSS_Name
/= TSS_Stream_Input
3395 and then TSS_Name
/= TSS_Stream_Output
3398 ("\type of & does not match!", New_Formal
);
3405 -- Full conformance checks
3407 if Ctype
= Fully_Conformant
then
3409 -- We have checked already that names match
3411 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
3413 -- Check default expressions for in parameters
3416 NewD
: constant Boolean :=
3417 Present
(Default_Value
(New_Formal
));
3418 OldD
: constant Boolean :=
3419 Present
(Default_Value
(Old_Formal
));
3421 if NewD
or OldD
then
3423 -- The old default value has been analyzed because the
3424 -- current full declaration will have frozen everything
3425 -- before. The new default value has not been analyzed,
3426 -- so analyze it now before we check for conformance.
3429 Push_Scope
(New_Id
);
3430 Preanalyze_Spec_Expression
3431 (Default_Value
(New_Formal
), Etype
(New_Formal
));
3435 if not (NewD
and OldD
)
3436 or else not Fully_Conformant_Expressions
3437 (Default_Value
(Old_Formal
),
3438 Default_Value
(New_Formal
))
3441 ("\default expression for & does not match!",
3450 -- A couple of special checks for Ada 83 mode. These checks are
3451 -- skipped if either entity is an operator in package Standard,
3452 -- or if either old or new instance is not from the source program.
3454 if Ada_Version
= Ada_83
3455 and then Sloc
(Old_Id
) > Standard_Location
3456 and then Sloc
(New_Id
) > Standard_Location
3457 and then Comes_From_Source
(Old_Id
)
3458 and then Comes_From_Source
(New_Id
)
3461 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
3462 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
3465 -- Explicit IN must be present or absent in both cases. This
3466 -- test is required only in the full conformance case.
3468 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
3469 and then Ctype
= Fully_Conformant
3472 ("\(Ada 83) IN must appear in both declarations",
3477 -- Grouping (use of comma in param lists) must be the same
3478 -- This is where we catch a misconformance like:
3481 -- A : Integer; B : Integer
3483 -- which are represented identically in the tree except
3484 -- for the setting of the flags More_Ids and Prev_Ids.
3486 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
3487 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
3490 ("\grouping of & does not match!", New_Formal
);
3496 -- This label is required when skipping controlling formals
3498 <<Skip_Controlling_Formal
>>
3500 Next_Formal
(Old_Formal
);
3501 Next_Formal
(New_Formal
);
3504 if Present
(Old_Formal
) then
3505 Conformance_Error
("\too few parameters!");
3508 elsif Present
(New_Formal
) then
3509 Conformance_Error
("\too many parameters!", New_Formal
);
3512 end Check_Conformance
;
3514 -----------------------
3515 -- Check_Conventions --
3516 -----------------------
3518 procedure Check_Conventions
(Typ
: Entity_Id
) is
3519 Ifaces_List
: Elist_Id
;
3521 procedure Check_Convention
(Op
: Entity_Id
);
3522 -- Verify that the convention of inherited dispatching operation Op is
3523 -- consistent among all subprograms it overrides. In order to minimize
3524 -- the search, Search_From is utilized to designate a specific point in
3525 -- the list rather than iterating over the whole list once more.
3527 ----------------------
3528 -- Check_Convention --
3529 ----------------------
3531 procedure Check_Convention
(Op
: Entity_Id
) is
3532 Iface_Elmt
: Elmt_Id
;
3533 Iface_Prim_Elmt
: Elmt_Id
;
3534 Iface_Prim
: Entity_Id
;
3537 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
3538 while Present
(Iface_Elmt
) loop
3540 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
3541 while Present
(Iface_Prim_Elmt
) loop
3542 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
3544 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
3545 and then Convention
(Iface_Prim
) /= Convention
(Op
)
3548 ("inconsistent conventions in primitive operations", Typ
);
3550 Error_Msg_Name_1
:= Chars
(Op
);
3551 Error_Msg_Name_2
:= Get_Convention_Name
(Convention
(Op
));
3552 Error_Msg_Sloc
:= Sloc
(Op
);
3554 if Comes_From_Source
(Op
) then
3555 if not Is_Overriding_Operation
(Op
) then
3556 Error_Msg_N
("\\primitive % defined #", Typ
);
3558 Error_Msg_N
("\\overridding operation % with " &
3559 "convention % defined #", Typ
);
3562 else pragma Assert
(Present
(Alias
(Op
)));
3563 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
3564 Error_Msg_N
("\\inherited operation % with " &
3565 "convention % defined #", Typ
);
3568 Error_Msg_Name_1
:= Chars
(Op
);
3570 Get_Convention_Name
(Convention
(Iface_Prim
));
3571 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
3572 Error_Msg_N
("\\overridden operation % with " &
3573 "convention % defined #", Typ
);
3575 -- Avoid cascading errors
3580 Next_Elmt
(Iface_Prim_Elmt
);
3583 Next_Elmt
(Iface_Elmt
);
3585 end Check_Convention
;
3589 Prim_Op
: Entity_Id
;
3590 Prim_Op_Elmt
: Elmt_Id
;
3592 -- Start of processing for Check_Conventions
3595 if not Has_Interfaces
(Typ
) then
3599 Collect_Interfaces
(Typ
, Ifaces_List
);
3601 -- The algorithm checks every overriding dispatching operation against
3602 -- all the corresponding overridden dispatching operations, detecting
3603 -- differences in conventions.
3605 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
3606 while Present
(Prim_Op_Elmt
) loop
3607 Prim_Op
:= Node
(Prim_Op_Elmt
);
3609 -- A small optimization: skip the predefined dispatching operations
3610 -- since they always have the same convention.
3612 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
3613 Check_Convention
(Prim_Op
);
3616 Next_Elmt
(Prim_Op_Elmt
);
3618 end Check_Conventions
;
3620 ------------------------------
3621 -- Check_Delayed_Subprogram --
3622 ------------------------------
3624 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
3627 procedure Possible_Freeze
(T
: Entity_Id
);
3628 -- T is the type of either a formal parameter or of the return type.
3629 -- If T is not yet frozen and needs a delayed freeze, then the
3630 -- subprogram itself must be delayed.
3632 ---------------------
3633 -- Possible_Freeze --
3634 ---------------------
3636 procedure Possible_Freeze
(T
: Entity_Id
) is
3638 if Has_Delayed_Freeze
(T
)
3639 and then not Is_Frozen
(T
)
3641 Set_Has_Delayed_Freeze
(Designator
);
3643 elsif Is_Access_Type
(T
)
3644 and then Has_Delayed_Freeze
(Designated_Type
(T
))
3645 and then not Is_Frozen
(Designated_Type
(T
))
3647 Set_Has_Delayed_Freeze
(Designator
);
3649 end Possible_Freeze
;
3651 -- Start of processing for Check_Delayed_Subprogram
3654 -- Never need to freeze abstract subprogram
3656 if Ekind
(Designator
) /= E_Subprogram_Type
3657 and then Is_Abstract_Subprogram
(Designator
)
3661 -- Need delayed freeze if return type itself needs a delayed
3662 -- freeze and is not yet frozen.
3664 Possible_Freeze
(Etype
(Designator
));
3665 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
3667 -- Need delayed freeze if any of the formal types themselves need
3668 -- a delayed freeze and are not yet frozen.
3670 F
:= First_Formal
(Designator
);
3671 while Present
(F
) loop
3672 Possible_Freeze
(Etype
(F
));
3673 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
3678 -- Mark functions that return by reference. Note that it cannot be
3679 -- done for delayed_freeze subprograms because the underlying
3680 -- returned type may not be known yet (for private types)
3682 if not Has_Delayed_Freeze
(Designator
)
3683 and then Expander_Active
3686 Typ
: constant Entity_Id
:= Etype
(Designator
);
3687 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
3690 if Is_Inherently_Limited_Type
(Typ
) then
3691 Set_Returns_By_Ref
(Designator
);
3693 elsif Present
(Utyp
) and then CW_Or_Controlled_Type
(Utyp
) then
3694 Set_Returns_By_Ref
(Designator
);
3698 end Check_Delayed_Subprogram
;
3700 ------------------------------------
3701 -- Check_Discriminant_Conformance --
3702 ------------------------------------
3704 procedure Check_Discriminant_Conformance
3709 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
3710 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
3711 New_Discr_Id
: Entity_Id
;
3712 New_Discr_Type
: Entity_Id
;
3714 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
3715 -- Post error message for conformance error on given node. Two messages
3716 -- are output. The first points to the previous declaration with a
3717 -- general "no conformance" message. The second is the detailed reason,
3718 -- supplied as Msg. The parameter N provide information for a possible
3719 -- & insertion in the message.
3721 -----------------------
3722 -- Conformance_Error --
3723 -----------------------
3725 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
3727 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
3728 Error_Msg_N
("not fully conformant with declaration#!", N
);
3729 Error_Msg_NE
(Msg
, N
, N
);
3730 end Conformance_Error
;
3732 -- Start of processing for Check_Discriminant_Conformance
3735 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
3737 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
3739 -- The subtype mark of the discriminant on the full type has not
3740 -- been analyzed so we do it here. For an access discriminant a new
3743 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
3745 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
3748 Analyze
(Discriminant_Type
(New_Discr
));
3749 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
3752 if not Conforming_Types
3753 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
3755 Conformance_Error
("type of & does not match!", New_Discr_Id
);
3758 -- Treat the new discriminant as an occurrence of the old one,
3759 -- for navigation purposes, and fill in some semantic
3760 -- information, for completeness.
3762 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
3763 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
3764 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
3769 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
3770 Conformance_Error
("name & does not match!", New_Discr_Id
);
3774 -- Default expressions must match
3777 NewD
: constant Boolean :=
3778 Present
(Expression
(New_Discr
));
3779 OldD
: constant Boolean :=
3780 Present
(Expression
(Parent
(Old_Discr
)));
3783 if NewD
or OldD
then
3785 -- The old default value has been analyzed and expanded,
3786 -- because the current full declaration will have frozen
3787 -- everything before. The new default values have not been
3788 -- expanded, so expand now to check conformance.
3791 Preanalyze_Spec_Expression
3792 (Expression
(New_Discr
), New_Discr_Type
);
3795 if not (NewD
and OldD
)
3796 or else not Fully_Conformant_Expressions
3797 (Expression
(Parent
(Old_Discr
)),
3798 Expression
(New_Discr
))
3802 ("default expression for & does not match!",
3809 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
3811 if Ada_Version
= Ada_83
then
3813 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
3816 -- Grouping (use of comma in param lists) must be the same
3817 -- This is where we catch a misconformance like:
3820 -- A : Integer; B : Integer
3822 -- which are represented identically in the tree except
3823 -- for the setting of the flags More_Ids and Prev_Ids.
3825 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
3826 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
3829 ("grouping of & does not match!", New_Discr_Id
);
3835 Next_Discriminant
(Old_Discr
);
3839 if Present
(Old_Discr
) then
3840 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
3843 elsif Present
(New_Discr
) then
3845 ("too many discriminants!", Defining_Identifier
(New_Discr
));
3848 end Check_Discriminant_Conformance
;
3850 ----------------------------
3851 -- Check_Fully_Conformant --
3852 ----------------------------
3854 procedure Check_Fully_Conformant
3855 (New_Id
: Entity_Id
;
3857 Err_Loc
: Node_Id
:= Empty
)
3860 pragma Warnings
(Off
, Result
);
3863 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
3864 end Check_Fully_Conformant
;
3866 ---------------------------
3867 -- Check_Mode_Conformant --
3868 ---------------------------
3870 procedure Check_Mode_Conformant
3871 (New_Id
: Entity_Id
;
3873 Err_Loc
: Node_Id
:= Empty
;
3874 Get_Inst
: Boolean := False)
3877 pragma Warnings
(Off
, Result
);
3880 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
3881 end Check_Mode_Conformant
;
3883 --------------------------------
3884 -- Check_Overriding_Indicator --
3885 --------------------------------
3887 procedure Check_Overriding_Indicator
3889 Overridden_Subp
: Entity_Id
;
3890 Is_Primitive
: Boolean)
3896 -- No overriding indicator for literals
3898 if Ekind
(Subp
) = E_Enumeration_Literal
then
3901 elsif Ekind
(Subp
) = E_Entry
then
3902 Decl
:= Parent
(Subp
);
3905 Decl
:= Unit_Declaration_Node
(Subp
);
3908 if Nkind_In
(Decl
, N_Subprogram_Body
,
3909 N_Subprogram_Body_Stub
,
3910 N_Subprogram_Declaration
,
3911 N_Abstract_Subprogram_Declaration
,
3912 N_Subprogram_Renaming_Declaration
)
3914 Spec
:= Specification
(Decl
);
3916 elsif Nkind
(Decl
) = N_Entry_Declaration
then
3923 if Present
(Overridden_Subp
) then
3924 if Must_Not_Override
(Spec
) then
3925 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
3927 if Ekind
(Subp
) = E_Entry
then
3929 ("entry & overrides inherited operation #", Spec
, Subp
);
3932 ("subprogram & overrides inherited operation #", Spec
, Subp
);
3935 elsif Is_Subprogram
(Subp
) then
3936 Set_Is_Overriding_Operation
(Subp
);
3939 -- If Subp is an operator, it may override a predefined operation.
3940 -- In that case overridden_subp is empty because of our implicit
3941 -- representation for predefined operators. We have to check whether the
3942 -- signature of Subp matches that of a predefined operator. Note that
3943 -- first argument provides the name of the operator, and the second
3944 -- argument the signature that may match that of a standard operation.
3945 -- If the indicator is overriding, then the operator must match a
3946 -- predefined signature, because we know already that there is no
3947 -- explicit overridden operation.
3949 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
3951 if Must_Not_Override
(Spec
) then
3952 if not Is_Primitive
then
3954 ("overriding indicator only allowed "
3955 & "if subprogram is primitive", Subp
);
3957 elsif Operator_Matches_Spec
(Subp
, Subp
) then
3959 ("subprogram & overrides predefined operator ", Spec
, Subp
);
3962 elsif Is_Overriding_Operation
(Subp
) then
3965 elsif Must_Override
(Spec
) then
3966 if not Operator_Matches_Spec
(Subp
, Subp
) then
3967 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
3970 Set_Is_Overriding_Operation
(Subp
);
3974 elsif Must_Override
(Spec
) then
3975 if Ekind
(Subp
) = E_Entry
then
3976 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
3978 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
3981 -- If the operation is marked "not overriding" and it's not primitive
3982 -- then an error is issued, unless this is an operation of a task or
3983 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
3984 -- has been specified have already been checked above.
3986 elsif Must_Not_Override
(Spec
)
3987 and then not Is_Primitive
3988 and then Ekind
(Subp
) /= E_Entry
3989 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
3992 ("overriding indicator only allowed if subprogram is primitive",
3996 end Check_Overriding_Indicator
;
4002 -- Note: this procedure needs to know far too much about how the expander
4003 -- messes with exceptions. The use of the flag Exception_Junk and the
4004 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4005 -- works, but is not very clean. It would be better if the expansion
4006 -- routines would leave Original_Node working nicely, and we could use
4007 -- Original_Node here to ignore all the peculiar expander messing ???
4009 procedure Check_Returns
4013 Proc
: Entity_Id
:= Empty
)
4017 procedure Check_Statement_Sequence
(L
: List_Id
);
4018 -- Internal recursive procedure to check a list of statements for proper
4019 -- termination by a return statement (or a transfer of control or a
4020 -- compound statement that is itself internally properly terminated).
4022 ------------------------------
4023 -- Check_Statement_Sequence --
4024 ------------------------------
4026 procedure Check_Statement_Sequence
(L
: List_Id
) is
4031 Raise_Exception_Call
: Boolean;
4032 -- Set True if statement sequence terminated by Raise_Exception call
4033 -- or a Reraise_Occurrence call.
4036 Raise_Exception_Call
:= False;
4038 -- Get last real statement
4040 Last_Stm
:= Last
(L
);
4042 -- Deal with digging out exception handler statement sequences that
4043 -- have been transformed by the local raise to goto optimization.
4044 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4045 -- optimization has occurred, we are looking at something like:
4048 -- original stmts in block
4052 -- goto L1; | omitted if No_Exception_Propagation
4057 -- goto L3; -- skip handler when exception not raised
4059 -- <<L1>> -- target label for local exception
4073 -- and what we have to do is to dig out the estmts1 and estmts2
4074 -- sequences (which were the original sequences of statements in
4075 -- the exception handlers) and check them.
4077 if Nkind
(Last_Stm
) = N_Label
4078 and then Exception_Junk
(Last_Stm
)
4084 exit when Nkind
(Stm
) /= N_Block_Statement
;
4085 exit when not Exception_Junk
(Stm
);
4088 exit when Nkind
(Stm
) /= N_Label
;
4089 exit when not Exception_Junk
(Stm
);
4090 Check_Statement_Sequence
4091 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
4096 exit when Nkind
(Stm
) /= N_Goto_Statement
;
4097 exit when not Exception_Junk
(Stm
);
4101 -- Don't count pragmas
4103 while Nkind
(Last_Stm
) = N_Pragma
4105 -- Don't count call to SS_Release (can happen after Raise_Exception)
4108 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
4110 Nkind
(Name
(Last_Stm
)) = N_Identifier
4112 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
4114 -- Don't count exception junk
4117 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
4119 N_Object_Declaration
)
4120 and then Exception_Junk
(Last_Stm
))
4121 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
4122 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
4127 -- Here we have the "real" last statement
4129 Kind
:= Nkind
(Last_Stm
);
4131 -- Transfer of control, OK. Note that in the No_Return procedure
4132 -- case, we already diagnosed any explicit return statements, so
4133 -- we can treat them as OK in this context.
4135 if Is_Transfer
(Last_Stm
) then
4138 -- Check cases of explicit non-indirect procedure calls
4140 elsif Kind
= N_Procedure_Call_Statement
4141 and then Is_Entity_Name
(Name
(Last_Stm
))
4143 -- Check call to Raise_Exception procedure which is treated
4144 -- specially, as is a call to Reraise_Occurrence.
4146 -- We suppress the warning in these cases since it is likely that
4147 -- the programmer really does not expect to deal with the case
4148 -- of Null_Occurrence, and thus would find a warning about a
4149 -- missing return curious, and raising Program_Error does not
4150 -- seem such a bad behavior if this does occur.
4152 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4153 -- behavior will be to raise Constraint_Error (see AI-329).
4155 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
4157 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
4159 Raise_Exception_Call
:= True;
4161 -- For Raise_Exception call, test first argument, if it is
4162 -- an attribute reference for a 'Identity call, then we know
4163 -- that the call cannot possibly return.
4166 Arg
: constant Node_Id
:=
4167 Original_Node
(First_Actual
(Last_Stm
));
4169 if Nkind
(Arg
) = N_Attribute_Reference
4170 and then Attribute_Name
(Arg
) = Name_Identity
4177 -- If statement, need to look inside if there is an else and check
4178 -- each constituent statement sequence for proper termination.
4180 elsif Kind
= N_If_Statement
4181 and then Present
(Else_Statements
(Last_Stm
))
4183 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
4184 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4186 if Present
(Elsif_Parts
(Last_Stm
)) then
4188 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
4191 while Present
(Elsif_Part
) loop
4192 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
4200 -- Case statement, check each case for proper termination
4202 elsif Kind
= N_Case_Statement
then
4206 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
4207 while Present
(Case_Alt
) loop
4208 Check_Statement_Sequence
(Statements
(Case_Alt
));
4209 Next_Non_Pragma
(Case_Alt
);
4215 -- Block statement, check its handled sequence of statements
4217 elsif Kind
= N_Block_Statement
then
4223 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
4232 -- Loop statement. If there is an iteration scheme, we can definitely
4233 -- fall out of the loop. Similarly if there is an exit statement, we
4234 -- can fall out. In either case we need a following return.
4236 elsif Kind
= N_Loop_Statement
then
4237 if Present
(Iteration_Scheme
(Last_Stm
))
4238 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
4242 -- A loop with no exit statement or iteration scheme is either
4243 -- an infinite loop, or it has some other exit (raise/return).
4244 -- In either case, no warning is required.
4250 -- Timed entry call, check entry call and delay alternatives
4252 -- Note: in expanded code, the timed entry call has been converted
4253 -- to a set of expanded statements on which the check will work
4254 -- correctly in any case.
4256 elsif Kind
= N_Timed_Entry_Call
then
4258 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4259 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
4262 -- If statement sequence of entry call alternative is missing,
4263 -- then we can definitely fall through, and we post the error
4264 -- message on the entry call alternative itself.
4266 if No
(Statements
(ECA
)) then
4269 -- If statement sequence of delay alternative is missing, then
4270 -- we can definitely fall through, and we post the error
4271 -- message on the delay alternative itself.
4273 -- Note: if both ECA and DCA are missing the return, then we
4274 -- post only one message, should be enough to fix the bugs.
4275 -- If not we will get a message next time on the DCA when the
4278 elsif No
(Statements
(DCA
)) then
4281 -- Else check both statement sequences
4284 Check_Statement_Sequence
(Statements
(ECA
));
4285 Check_Statement_Sequence
(Statements
(DCA
));
4290 -- Conditional entry call, check entry call and else part
4292 -- Note: in expanded code, the conditional entry call has been
4293 -- converted to a set of expanded statements on which the check
4294 -- will work correctly in any case.
4296 elsif Kind
= N_Conditional_Entry_Call
then
4298 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4301 -- If statement sequence of entry call alternative is missing,
4302 -- then we can definitely fall through, and we post the error
4303 -- message on the entry call alternative itself.
4305 if No
(Statements
(ECA
)) then
4308 -- Else check statement sequence and else part
4311 Check_Statement_Sequence
(Statements
(ECA
));
4312 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4318 -- If we fall through, issue appropriate message
4321 if not Raise_Exception_Call
then
4323 ("?RETURN statement missing following this statement!",
4326 ("\?Program_Error may be raised at run time!",
4330 -- Note: we set Err even though we have not issued a warning
4331 -- because we still have a case of a missing return. This is
4332 -- an extremely marginal case, probably will never be noticed
4333 -- but we might as well get it right.
4337 -- Otherwise we have the case of a procedure marked No_Return
4340 if not Raise_Exception_Call
then
4342 ("?implied return after this statement " &
4343 "will raise Program_Error",
4346 ("\?procedure & is marked as No_Return!",
4351 RE
: constant Node_Id
:=
4352 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
4353 Reason
=> PE_Implicit_Return
);
4355 Insert_After
(Last_Stm
, RE
);
4359 end Check_Statement_Sequence
;
4361 -- Start of processing for Check_Returns
4365 Check_Statement_Sequence
(Statements
(HSS
));
4367 if Present
(Exception_Handlers
(HSS
)) then
4368 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
4369 while Present
(Handler
) loop
4370 Check_Statement_Sequence
(Statements
(Handler
));
4371 Next_Non_Pragma
(Handler
);
4376 ----------------------------
4377 -- Check_Subprogram_Order --
4378 ----------------------------
4380 procedure Check_Subprogram_Order
(N
: Node_Id
) is
4382 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
4383 -- This is used to check if S1 > S2 in the sense required by this
4384 -- test, for example nameab < namec, but name2 < name10.
4386 -----------------------------
4387 -- Subprogram_Name_Greater --
4388 -----------------------------
4390 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
4395 -- Remove trailing numeric parts
4398 while S1
(L1
) in '0' .. '9' loop
4403 while S2
(L2
) in '0' .. '9' loop
4407 -- If non-numeric parts non-equal, that's decisive
4409 if S1
(S1
'First .. L1
) < S2
(S2
'First .. L2
) then
4412 elsif S1
(S1
'First .. L1
) > S2
(S2
'First .. L2
) then
4415 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4416 -- that a missing suffix is treated as numeric zero in this test.
4420 while L1
< S1
'Last loop
4422 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
4426 while L2
< S2
'Last loop
4428 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
4433 end Subprogram_Name_Greater
;
4435 -- Start of processing for Check_Subprogram_Order
4438 -- Check body in alpha order if this is option
4441 and then Style_Check_Order_Subprograms
4442 and then Nkind
(N
) = N_Subprogram_Body
4443 and then Comes_From_Source
(N
)
4444 and then In_Extended_Main_Source_Unit
(N
)
4448 renames Scope_Stack
.Table
4449 (Scope_Stack
.Last
).Last_Subprogram_Name
;
4451 Body_Id
: constant Entity_Id
:=
4452 Defining_Entity
(Specification
(N
));
4455 Get_Decoded_Name_String
(Chars
(Body_Id
));
4458 if Subprogram_Name_Greater
4459 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
4461 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
4467 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
4470 end Check_Subprogram_Order;
4472 ------------------------------
4473 -- Check_Subtype_Conformant --
4474 ------------------------------
4476 procedure Check_Subtype_Conformant
4477 (New_Id : Entity_Id;
4479 Err_Loc : Node_Id := Empty;
4480 Skip_Controlling_Formals : Boolean := False)
4483 pragma Warnings (Off, Result);
4486 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
4487 Skip_Controlling_Formals => Skip_Controlling_Formals);
4488 end Check_Subtype_Conformant;
4490 ---------------------------
4491 -- Check_Type_Conformant --
4492 ---------------------------
4494 procedure Check_Type_Conformant
4495 (New_Id : Entity_Id;
4497 Err_Loc : Node_Id := Empty)
4500 pragma Warnings (Off, Result);
4503 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
4504 end Check_Type_Conformant;
4506 ----------------------
4507 -- Conforming_Types --
4508 ----------------------
4510 function Conforming_Types
4513 Ctype : Conformance_Type;
4514 Get_Inst : Boolean := False) return Boolean
4516 Type_1 : Entity_Id := T1;
4517 Type_2 : Entity_Id := T2;
4518 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
4520 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
4521 -- If neither T1 nor T2 are generic actual types, or if they are in
4522 -- different scopes (e.g. parent and child instances), then verify that
4523 -- the base types are equal. Otherwise T1 and T2 must be on the same
4524 -- subtype chain. The whole purpose of this procedure is to prevent
4525 -- spurious ambiguities in an instantiation that may arise if two
4526 -- distinct generic types are instantiated with the same actual.
4528 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
4529 -- An access parameter can designate an incomplete type. If the
4530 -- incomplete type is the limited view of a type from a limited_
4531 -- with_clause, check whether the non-limited view is available. If
4532 -- it is a (non-limited) incomplete type, get the full view.
4534 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
4535 -- Returns True if and only if either T1 denotes a limited view of T2
4536 -- or T2 denotes a limited view of T1. This can arise when the limited
4537 -- with view of a type is used in a subprogram declaration and the
4538 -- subprogram body is in the scope of a regular with clause for the
4539 -- same unit. In such a case, the two type entities can be considered
4540 -- identical for purposes of conformance checking.
4542 ----------------------
4543 -- Base_Types_Match --
4544 ----------------------
4546 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
4551 elsif Base_Type (T1) = Base_Type (T2) then
4553 -- The following is too permissive. A more precise test should
4554 -- check that the generic actual is an ancestor subtype of the
4557 return not Is_Generic_Actual_Type (T1)
4558 or else not Is_Generic_Actual_Type (T2)
4559 or else Scope (T1) /= Scope (T2);
4564 end Base_Types_Match;
4566 --------------------------
4567 -- Find_Designated_Type --
4568 --------------------------
4570 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
4574 Desig := Directly_Designated_Type (T);
4576 if Ekind (Desig) = E_Incomplete_Type then
4578 -- If regular incomplete type, get full view if available
4580 if Present (Full_View (Desig)) then
4581 Desig := Full_View (Desig);
4583 -- If limited view of a type, get non-limited view if available,
4584 -- and check again for a regular incomplete type.
4586 elsif Present (Non_Limited_View (Desig)) then
4587 Desig := Get_Full_View (Non_Limited_View (Desig));
4592 end Find_Designated_Type;
4594 -------------------------------
4595 -- Matches_Limited_With_View --
4596 -------------------------------
4598 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
4600 -- In some cases a type imported through a limited_with clause, and
4601 -- its nonlimited view are both visible, for example in an anonymous
4602 -- access-to-class-wide type in a formal. Both entities designate the
4605 if From_With_Type (T1)
4606 and then T2 = Available_View (T1)
4610 elsif From_With_Type (T2)
4611 and then T1 = Available_View (T2)
4618 end Matches_Limited_With_View;
4620 -- Start of processing for Conforming_Types
4623 -- The context is an instance association for a formal
4624 -- access-to-subprogram type; the formal parameter types require
4625 -- mapping because they may denote other formal parameters of the
4629 Type_1 := Get_Instance_Of (T1);
4630 Type_2 := Get_Instance_Of (T2);
4633 -- If one of the types is a view of the other introduced by a limited
4634 -- with clause, treat these as conforming for all purposes.
4636 if Matches_Limited_With_View (T1, T2) then
4639 elsif Base_Types_Match (Type_1, Type_2) then
4640 return Ctype <= Mode_Conformant
4641 or else Subtypes_Statically_Match (Type_1, Type_2);
4643 elsif Is_Incomplete_Or_Private_Type (Type_1)
4644 and then Present (Full_View (Type_1))
4645 and then Base_Types_Match (Full_View (Type_1), Type_2)
4647 return Ctype <= Mode_Conformant
4648 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
4650 elsif Ekind (Type_2) = E_Incomplete_Type
4651 and then Present (Full_View (Type_2))
4652 and then Base_Types_Match (Type_1, Full_View (Type_2))
4654 return Ctype <= Mode_Conformant
4655 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4657 elsif Is_Private_Type (Type_2)
4658 and then In_Instance
4659 and then Present (Full_View (Type_2))
4660 and then Base_Types_Match (Type_1, Full_View (Type_2))
4662 return Ctype <= Mode_Conformant
4663 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4666 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
4667 -- treated recursively because they carry a signature.
4669 Are_Anonymous_Access_To_Subprogram_Types :=
4670 Ekind (Type_1) = Ekind (Type_2)
4672 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
4674 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
4676 -- Test anonymous access type case. For this case, static subtype
4677 -- matching is required for mode conformance (RM 6.3.1(15)). We check
4678 -- the base types because we may have built internal subtype entities
4679 -- to handle null-excluding types (see Process_Formals).
4681 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
4683 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
4684 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
4687 Desig_1 : Entity_Id;
4688 Desig_2 : Entity_Id;
4691 -- In Ada2005, access constant indicators must match for
4692 -- subtype conformance.
4694 if Ada_Version >= Ada_05
4695 and then Ctype >= Subtype_Conformant
4697 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
4702 Desig_1 := Find_Designated_Type (Type_1);
4704 Desig_2 := Find_Designated_Type (Type_2);
4706 -- If the context is an instance association for a formal
4707 -- access-to-subprogram type; formal access parameter designated
4708 -- types require mapping because they may denote other formal
4709 -- parameters of the generic unit.
4712 Desig_1 := Get_Instance_Of (Desig_1);
4713 Desig_2 := Get_Instance_Of (Desig_2);
4716 -- It is possible for a Class_Wide_Type to be introduced for an
4717 -- incomplete type, in which case there is a separate class_ wide
4718 -- type for the full view. The types conform if their Etypes
4719 -- conform, i.e. one may be the full view of the other. This can
4720 -- only happen in the context of an access parameter, other uses
4721 -- of an incomplete Class_Wide_Type are illegal.
4723 if Is_Class_Wide_Type (Desig_1)
4724 and then Is_Class_Wide_Type (Desig_2)
4728 (Etype (Base_Type (Desig_1)),
4729 Etype (Base_Type (Desig_2)), Ctype);
4731 elsif Are_Anonymous_Access_To_Subprogram_Types then
4732 if Ada_Version < Ada_05 then
4733 return Ctype = Type_Conformant
4735 Subtypes_Statically_Match (Desig_1, Desig_2);
4737 -- We must check the conformance of the signatures themselves
4741 Conformant : Boolean;
4744 (Desig_1, Desig_2, Ctype, False, Conformant);
4750 return Base_Type (Desig_1) = Base_Type (Desig_2)
4751 and then (Ctype = Type_Conformant
4753 Subtypes_Statically_Match (Desig_1, Desig_2));
4757 -- Otherwise definitely no match
4760 if ((Ekind (Type_1) = E_Anonymous_Access_Type
4761 and then Is_Access_Type (Type_2))
4762 or else (Ekind (Type_2) = E_Anonymous_Access_Type
4763 and then Is_Access_Type (Type_1)))
4766 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
4768 May_Hide_Profile := True;
4773 end Conforming_Types;
4775 --------------------------
4776 -- Create_Extra_Formals --
4777 --------------------------
4779 procedure Create_Extra_Formals (E : Entity_Id) is
4781 First_Extra : Entity_Id := Empty;
4782 Last_Extra : Entity_Id;
4783 Formal_Type : Entity_Id;
4784 P_Formal : Entity_Id := Empty;
4786 function Add_Extra_Formal
4787 (Assoc_Entity : Entity_Id;
4790 Suffix : String) return Entity_Id;
4791 -- Add an extra formal to the current list of formals and extra formals.
4792 -- The extra formal is added to the end of the list of extra formals,
4793 -- and also returned as the result. These formals are always of mode IN.
4794 -- The new formal has the type Typ, is declared in Scope, and its name
4795 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
4797 ----------------------
4798 -- Add_Extra_Formal --
4799 ----------------------
4801 function Add_Extra_Formal
4802 (Assoc_Entity : Entity_Id;
4805 Suffix : String) return Entity_Id
4807 EF : constant Entity_Id :=
4808 Make_Defining_Identifier (Sloc (Assoc_Entity),
4809 Chars => New_External_Name (Chars (Assoc_Entity),
4813 -- A little optimization. Never generate an extra formal for the
4814 -- _init operand of an initialization procedure, since it could
4817 if Chars (Formal) = Name_uInit then
4821 Set_Ekind (EF, E_In_Parameter);
4822 Set_Actual_Subtype (EF, Typ);
4823 Set_Etype (EF, Typ);
4824 Set_Scope (EF, Scope);
4825 Set_Mechanism (EF, Default_Mechanism);
4826 Set_Formal_Validity (EF);
4828 if No (First_Extra) then
4830 Set_Extra_Formals (Scope, First_Extra);
4833 if Present (Last_Extra) then
4834 Set_Extra_Formal (Last_Extra, EF);
4840 end Add_Extra_Formal;
4842 -- Start of processing for Create_Extra_Formals
4845 -- We never generate extra formals if expansion is not active
4846 -- because we don't need them unless we are generating code.
4848 if not Expander_Active then
4852 -- If this is a derived subprogram then the subtypes of the parent
4853 -- subprogram's formal parameters will be used to to determine the need
4854 -- for extra formals.
4856 if Is_Overloadable (E) and then Present (Alias (E)) then
4857 P_Formal := First_Formal (Alias (E));
4860 Last_Extra := Empty;
4861 Formal := First_Formal (E);
4862 while Present (Formal) loop
4863 Last_Extra := Formal;
4864 Next_Formal (Formal);
4867 -- If Extra_formals were already created, don't do it again. This
4868 -- situation may arise for subprogram types created as part of
4869 -- dispatching calls (see Expand_Dispatching_Call)
4871 if Present (Last_Extra) and then
4872 Present (Extra_Formal (Last_Extra))
4877 -- If the subprogram is a predefined dispatching subprogram then don't
4878 -- generate any extra constrained or accessibility level formals. In
4879 -- general we suppress these for internal subprograms (by not calling
4880 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
4881 -- generated stream attributes do get passed through because extra
4882 -- build-in-place formals are needed in some cases (limited 'Input
).
4884 if Is_Predefined_Dispatching_Operation
(E
) then
4885 goto Test_For_BIP_Extras
;
4888 Formal
:= First_Formal
(E
);
4889 while Present
(Formal
) loop
4891 -- Create extra formal for supporting the attribute 'Constrained.
4892 -- The case of a private type view without discriminants also
4893 -- requires the extra formal if the underlying type has defaulted
4896 if Ekind
(Formal
) /= E_In_Parameter
then
4897 if Present
(P_Formal
) then
4898 Formal_Type
:= Etype
(P_Formal
);
4900 Formal_Type
:= Etype
(Formal
);
4903 -- Do not produce extra formals for Unchecked_Union parameters.
4904 -- Jump directly to the end of the loop.
4906 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
4907 goto Skip_Extra_Formal_Generation
;
4910 if not Has_Discriminants
(Formal_Type
)
4911 and then Ekind
(Formal_Type
) in Private_Kind
4912 and then Present
(Underlying_Type
(Formal_Type
))
4914 Formal_Type
:= Underlying_Type
(Formal_Type
);
4917 if Has_Discriminants
(Formal_Type
)
4918 and then not Is_Constrained
(Formal_Type
)
4919 and then not Is_Indefinite_Subtype
(Formal_Type
)
4921 Set_Extra_Constrained
4922 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "F"));
4926 -- Create extra formal for supporting accessibility checking. This
4927 -- is done for both anonymous access formals and formals of named
4928 -- access types that are marked as controlling formals. The latter
4929 -- case can occur when Expand_Dispatching_Call creates a subprogram
4930 -- type and substitutes the types of access-to-class-wide actuals
4931 -- for the anonymous access-to-specific-type of controlling formals.
4932 -- Base_Type is applied because in cases where there is a null
4933 -- exclusion the formal may have an access subtype.
4935 -- This is suppressed if we specifically suppress accessibility
4936 -- checks at the package level for either the subprogram, or the
4937 -- package in which it resides. However, we do not suppress it
4938 -- simply if the scope has accessibility checks suppressed, since
4939 -- this could cause trouble when clients are compiled with a
4940 -- different suppression setting. The explicit checks at the
4941 -- package level are safe from this point of view.
4943 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
4944 or else (Is_Controlling_Formal
(Formal
)
4945 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
4947 (Explicit_Suppress
(E
, Accessibility_Check
)
4949 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
4952 or else Present
(Extra_Accessibility
(P_Formal
)))
4954 -- Temporary kludge: for now we avoid creating the extra formal
4955 -- for access parameters of protected operations because of
4956 -- problem with the case of internal protected calls. ???
4958 if Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Definition
4959 and then Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Body
4961 Set_Extra_Accessibility
4962 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "F"));
4966 -- This label is required when skipping extra formal generation for
4967 -- Unchecked_Union parameters.
4969 <<Skip_Extra_Formal_Generation
>>
4971 if Present
(P_Formal
) then
4972 Next_Formal
(P_Formal
);
4975 Next_Formal
(Formal
);
4978 <<Test_For_BIP_Extras
>>
4980 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
4981 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
4983 if Ada_Version
>= Ada_05
and then Is_Build_In_Place_Function
(E
) then
4985 Result_Subt
: constant Entity_Id
:= Etype
(E
);
4987 Discard
: Entity_Id
;
4988 pragma Warnings
(Off
, Discard
);
4991 -- In the case of functions with unconstrained result subtypes,
4992 -- add a 3-state formal indicating whether the return object is
4993 -- allocated by the caller (0), or should be allocated by the
4994 -- callee on the secondary stack (1) or in the global heap (2).
4995 -- For the moment we just use Natural for the type of this formal.
4996 -- Note that this formal isn't usually needed in the case where
4997 -- the result subtype is constrained, but it is needed when the
4998 -- function has a tagged result, because generally such functions
4999 -- can be called in a dispatching context and such calls must be
5000 -- handled like calls to a class-wide function.
5002 if not Is_Constrained
(Underlying_Type
(Result_Subt
))
5003 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5007 (E
, Standard_Natural
,
5008 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
5011 -- In the case of functions whose result type has controlled
5012 -- parts, we have an extra formal of type
5013 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5014 -- is, we are passing a pointer to a finalization list (which is
5015 -- itself a pointer). This extra formal is then passed along to
5016 -- Move_Final_List in case of successful completion of a return
5017 -- statement. We cannot pass an 'in out' parameter, because we
5018 -- need to update the finalization list during an abort-deferred
5019 -- region, rather than using copy-back after the function
5020 -- returns. This is true even if we are able to get away with
5021 -- having 'in out' parameters, which are normally illegal for
5022 -- functions. This formal is also needed when the function has
5023 -- a tagged result, because generally such functions can be called
5024 -- in a dispatching context and such calls must be handled like
5025 -- calls to class-wide functions.
5027 if Controlled_Type
(Result_Subt
)
5028 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5032 (E
, RTE
(RE_Finalizable_Ptr_Ptr
),
5033 E
, BIP_Formal_Suffix
(BIP_Final_List
));
5036 -- If the result type contains tasks, we have two extra formals:
5037 -- the master of the tasks to be created, and the caller's
5038 -- activation chain.
5040 if Has_Task
(Result_Subt
) then
5043 (E
, RTE
(RE_Master_Id
),
5044 E
, BIP_Formal_Suffix
(BIP_Master
));
5047 (E
, RTE
(RE_Activation_Chain_Access
),
5048 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
5051 -- All build-in-place functions get an extra formal that will be
5052 -- passed the address of the return object within the caller.
5055 Formal_Type
: constant Entity_Id
:=
5057 (E_Anonymous_Access_Type
, E
,
5058 Scope_Id
=> Scope
(E
));
5060 Set_Directly_Designated_Type
(Formal_Type
, Result_Subt
);
5061 Set_Etype
(Formal_Type
, Formal_Type
);
5062 Set_Depends_On_Private
5063 (Formal_Type
, Has_Private_Component
(Formal_Type
));
5064 Set_Is_Public
(Formal_Type
, Is_Public
(Scope
(Formal_Type
)));
5065 Set_Is_Access_Constant
(Formal_Type
, False);
5067 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5068 -- the designated type comes from the limited view (for
5069 -- back-end purposes).
5071 Set_From_With_Type
(Formal_Type
, From_With_Type
(Result_Subt
));
5073 Layout_Type
(Formal_Type
);
5077 (E
, Formal_Type
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
5081 end Create_Extra_Formals
;
5083 -----------------------------
5084 -- Enter_Overloaded_Entity --
5085 -----------------------------
5087 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
5088 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
5089 C_E
: Entity_Id
:= Current_Entity
(S
);
5093 Set_Has_Homonym
(E
);
5094 Set_Has_Homonym
(S
);
5097 Set_Is_Immediately_Visible
(S
);
5098 Set_Scope
(S
, Current_Scope
);
5100 -- Chain new entity if front of homonym in current scope, so that
5101 -- homonyms are contiguous.
5106 while Homonym
(C_E
) /= E
loop
5107 C_E
:= Homonym
(C_E
);
5110 Set_Homonym
(C_E
, S
);
5114 Set_Current_Entity
(S
);
5119 Append_Entity
(S
, Current_Scope
);
5120 Set_Public_Status
(S
);
5122 if Debug_Flag_E
then
5123 Write_Str
("New overloaded entity chain: ");
5124 Write_Name
(Chars
(S
));
5127 while Present
(E
) loop
5128 Write_Str
(" "); Write_Int
(Int
(E
));
5135 -- Generate warning for hiding
5138 and then Comes_From_Source
(S
)
5139 and then In_Extended_Main_Source_Unit
(S
)
5146 -- Warn unless genuine overloading
5148 if (not Is_Overloadable
(E
) or else Subtype_Conformant
(E
, S
))
5149 and then (Is_Immediately_Visible
(E
)
5151 Is_Potentially_Use_Visible
(S
))
5153 Error_Msg_Sloc
:= Sloc
(E
);
5154 Error_Msg_N
("declaration of & hides one#?", S
);
5158 end Enter_Overloaded_Entity
;
5160 -----------------------------
5161 -- Find_Corresponding_Spec --
5162 -----------------------------
5164 function Find_Corresponding_Spec
(N
: Node_Id
) return Entity_Id
is
5165 Spec
: constant Node_Id
:= Specification
(N
);
5166 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
5171 E
:= Current_Entity
(Designator
);
5172 while Present
(E
) loop
5174 -- We are looking for a matching spec. It must have the same scope,
5175 -- and the same name, and either be type conformant, or be the case
5176 -- of a library procedure spec and its body (which belong to one
5177 -- another regardless of whether they are type conformant or not).
5179 if Scope
(E
) = Current_Scope
then
5180 if Current_Scope
= Standard_Standard
5181 or else (Ekind
(E
) = Ekind
(Designator
)
5182 and then Type_Conformant
(E
, Designator
))
5184 -- Within an instantiation, we know that spec and body are
5185 -- subtype conformant, because they were subtype conformant
5186 -- in the generic. We choose the subtype-conformant entity
5187 -- here as well, to resolve spurious ambiguities in the
5188 -- instance that were not present in the generic (i.e. when
5189 -- two different types are given the same actual). If we are
5190 -- looking for a spec to match a body, full conformance is
5194 Set_Convention
(Designator
, Convention
(E
));
5196 if Nkind
(N
) = N_Subprogram_Body
5197 and then Present
(Homonym
(E
))
5198 and then not Fully_Conformant
(E
, Designator
)
5202 elsif not Subtype_Conformant
(E
, Designator
) then
5207 if not Has_Completion
(E
) then
5209 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
5210 Set_Corresponding_Spec
(N
, E
);
5213 Set_Has_Completion
(E
);
5216 elsif Nkind
(Parent
(N
)) = N_Subunit
then
5218 -- If this is the proper body of a subunit, the completion
5219 -- flag is set when analyzing the stub.
5223 -- If E is an internal function with a controlling result
5224 -- that was created for an operation inherited by a null
5225 -- extension, it may be overridden by a body without a previous
5226 -- spec (one more reason why these should be shunned). In that
5227 -- case remove the generated body, because the current one is
5228 -- the explicit overriding.
5230 elsif Ekind
(E
) = E_Function
5231 and then Ada_Version
>= Ada_05
5232 and then not Comes_From_Source
(E
)
5233 and then Has_Controlling_Result
(E
)
5234 and then Is_Null_Extension
(Etype
(E
))
5235 and then Comes_From_Source
(Spec
)
5237 Set_Has_Completion
(E
, False);
5239 if Expander_Active
then
5241 (Unit_Declaration_Node
5242 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
5245 -- If expansion is disabled, the wrapper function has not
5246 -- been generated, and this is the standard case of a late
5247 -- body overriding an inherited operation.
5253 -- If body already exists, this is an error unless the
5254 -- previous declaration is the implicit declaration of
5255 -- a derived subprogram, or this is a spurious overloading
5258 elsif No
(Alias
(E
))
5259 and then not Is_Intrinsic_Subprogram
(E
)
5260 and then not In_Instance
5262 Error_Msg_Sloc
:= Sloc
(E
);
5263 if Is_Imported
(E
) then
5265 ("body not allowed for imported subprogram & declared#",
5268 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
5272 elsif Is_Child_Unit
(E
)
5274 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
5276 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
5279 -- Child units cannot be overloaded, so a conformance mismatch
5280 -- between body and a previous spec is an error.
5283 ("body of child unit does not match previous declaration", N
);
5291 -- On exit, we know that no previous declaration of subprogram exists
5294 end Find_Corresponding_Spec
;
5296 ----------------------
5297 -- Fully_Conformant --
5298 ----------------------
5300 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
5303 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
5305 end Fully_Conformant
;
5307 ----------------------------------
5308 -- Fully_Conformant_Expressions --
5309 ----------------------------------
5311 function Fully_Conformant_Expressions
5312 (Given_E1
: Node_Id
;
5313 Given_E2
: Node_Id
) return Boolean
5315 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
5316 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
5317 -- We always test conformance on original nodes, since it is possible
5318 -- for analysis and/or expansion to make things look as though they
5319 -- conform when they do not, e.g. by converting 1+2 into 3.
5321 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
5322 renames Fully_Conformant_Expressions
;
5324 function FCL
(L1
, L2
: List_Id
) return Boolean;
5325 -- Compare elements of two lists for conformance. Elements have to
5326 -- be conformant, and actuals inserted as default parameters do not
5327 -- match explicit actuals with the same value.
5329 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
5330 -- Compare an operator node with a function call
5336 function FCL
(L1
, L2
: List_Id
) return Boolean is
5340 if L1
= No_List
then
5346 if L2
= No_List
then
5352 -- Compare two lists, skipping rewrite insertions (we want to
5353 -- compare the original trees, not the expanded versions!)
5356 if Is_Rewrite_Insertion
(N1
) then
5358 elsif Is_Rewrite_Insertion
(N2
) then
5364 elsif not FCE
(N1
, N2
) then
5377 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
5378 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
5383 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
5388 Act
:= First
(Actuals
);
5390 if Nkind
(Op_Node
) in N_Binary_Op
then
5392 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
5399 return Present
(Act
)
5400 and then FCE
(Right_Opnd
(Op_Node
), Act
)
5401 and then No
(Next
(Act
));
5405 -- Start of processing for Fully_Conformant_Expressions
5408 -- Non-conformant if paren count does not match. Note: if some idiot
5409 -- complains that we don't do this right for more than 3 levels of
5410 -- parentheses, they will be treated with the respect they deserve!
5412 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
5415 -- If same entities are referenced, then they are conformant even if
5416 -- they have different forms (RM 8.3.1(19-20)).
5418 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
5419 if Present
(Entity
(E1
)) then
5420 return Entity
(E1
) = Entity
(E2
)
5421 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
5422 and then Ekind
(Entity
(E1
)) = E_Discriminant
5423 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
5425 elsif Nkind
(E1
) = N_Expanded_Name
5426 and then Nkind
(E2
) = N_Expanded_Name
5427 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5428 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5430 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
5433 -- Identifiers in component associations don't always have
5434 -- entities, but their names must conform.
5436 return Nkind
(E1
) = N_Identifier
5437 and then Nkind
(E2
) = N_Identifier
5438 and then Chars
(E1
) = Chars
(E2
);
5441 elsif Nkind
(E1
) = N_Character_Literal
5442 and then Nkind
(E2
) = N_Expanded_Name
5444 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5445 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
5447 elsif Nkind
(E2
) = N_Character_Literal
5448 and then Nkind
(E1
) = N_Expanded_Name
5450 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5451 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
5453 elsif Nkind
(E1
) in N_Op
5454 and then Nkind
(E2
) = N_Function_Call
5456 return FCO
(E1
, E2
);
5458 elsif Nkind
(E2
) in N_Op
5459 and then Nkind
(E1
) = N_Function_Call
5461 return FCO
(E2
, E1
);
5463 -- Otherwise we must have the same syntactic entity
5465 elsif Nkind
(E1
) /= Nkind
(E2
) then
5468 -- At this point, we specialize by node type
5475 FCL
(Expressions
(E1
), Expressions
(E2
))
5476 and then FCL
(Component_Associations
(E1
),
5477 Component_Associations
(E2
));
5480 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
5482 Nkind
(Expression
(E2
)) = N_Qualified_Expression
5484 return FCE
(Expression
(E1
), Expression
(E2
));
5486 -- Check that the subtype marks and any constraints
5491 Indic1
: constant Node_Id
:= Expression
(E1
);
5492 Indic2
: constant Node_Id
:= Expression
(E2
);
5497 if Nkind
(Indic1
) /= N_Subtype_Indication
then
5499 Nkind
(Indic2
) /= N_Subtype_Indication
5500 and then Entity
(Indic1
) = Entity
(Indic2
);
5502 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
5504 Nkind
(Indic1
) /= N_Subtype_Indication
5505 and then Entity
(Indic1
) = Entity
(Indic2
);
5508 if Entity
(Subtype_Mark
(Indic1
)) /=
5509 Entity
(Subtype_Mark
(Indic2
))
5514 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
5515 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
5517 while Present
(Elt1
) and then Present
(Elt2
) loop
5518 if not FCE
(Elt1
, Elt2
) then
5531 when N_Attribute_Reference
=>
5533 Attribute_Name
(E1
) = Attribute_Name
(E2
)
5534 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5538 Entity
(E1
) = Entity
(E2
)
5539 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5540 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5542 when N_And_Then | N_Or_Else | N_Membership_Test
=>
5544 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5546 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5548 when N_Character_Literal
=>
5550 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
5552 when N_Component_Association
=>
5554 FCL
(Choices
(E1
), Choices
(E2
))
5555 and then FCE
(Expression
(E1
), Expression
(E2
));
5557 when N_Conditional_Expression
=>
5559 FCL
(Expressions
(E1
), Expressions
(E2
));
5561 when N_Explicit_Dereference
=>
5563 FCE
(Prefix
(E1
), Prefix
(E2
));
5565 when N_Extension_Aggregate
=>
5567 FCL
(Expressions
(E1
), Expressions
(E2
))
5568 and then Null_Record_Present
(E1
) =
5569 Null_Record_Present
(E2
)
5570 and then FCL
(Component_Associations
(E1
),
5571 Component_Associations
(E2
));
5573 when N_Function_Call
=>
5575 FCE
(Name
(E1
), Name
(E2
))
5576 and then FCL
(Parameter_Associations
(E1
),
5577 Parameter_Associations
(E2
));
5579 when N_Indexed_Component
=>
5581 FCE
(Prefix
(E1
), Prefix
(E2
))
5582 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5584 when N_Integer_Literal
=>
5585 return (Intval
(E1
) = Intval
(E2
));
5590 when N_Operator_Symbol
=>
5592 Chars
(E1
) = Chars
(E2
);
5594 when N_Others_Choice
=>
5597 when N_Parameter_Association
=>
5599 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
5600 and then FCE
(Explicit_Actual_Parameter
(E1
),
5601 Explicit_Actual_Parameter
(E2
));
5603 when N_Qualified_Expression
=>
5605 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5606 and then FCE
(Expression
(E1
), Expression
(E2
));
5610 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
5611 and then FCE
(High_Bound
(E1
), High_Bound
(E2
));
5613 when N_Real_Literal
=>
5614 return (Realval
(E1
) = Realval
(E2
));
5616 when N_Selected_Component
=>
5618 FCE
(Prefix
(E1
), Prefix
(E2
))
5619 and then FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
5623 FCE
(Prefix
(E1
), Prefix
(E2
))
5624 and then FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
5626 when N_String_Literal
=>
5628 S1
: constant String_Id
:= Strval
(E1
);
5629 S2
: constant String_Id
:= Strval
(E2
);
5630 L1
: constant Nat
:= String_Length
(S1
);
5631 L2
: constant Nat
:= String_Length
(S2
);
5638 for J
in 1 .. L1
loop
5639 if Get_String_Char
(S1
, J
) /=
5640 Get_String_Char
(S2
, J
)
5650 when N_Type_Conversion
=>
5652 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5653 and then FCE
(Expression
(E1
), Expression
(E2
));
5657 Entity
(E1
) = Entity
(E2
)
5658 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5660 when N_Unchecked_Type_Conversion
=>
5662 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5663 and then FCE
(Expression
(E1
), Expression
(E2
));
5665 -- All other node types cannot appear in this context. Strictly
5666 -- we should raise a fatal internal error. Instead we just ignore
5667 -- the nodes. This means that if anyone makes a mistake in the
5668 -- expander and mucks an expression tree irretrievably, the
5669 -- result will be a failure to detect a (probably very obscure)
5670 -- case of non-conformance, which is better than bombing on some
5671 -- case where two expressions do in fact conform.
5678 end Fully_Conformant_Expressions
;
5680 ----------------------------------------
5681 -- Fully_Conformant_Discrete_Subtypes --
5682 ----------------------------------------
5684 function Fully_Conformant_Discrete_Subtypes
5685 (Given_S1
: Node_Id
;
5686 Given_S2
: Node_Id
) return Boolean
5688 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
5689 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
5691 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
5692 -- Special-case for a bound given by a discriminant, which in the body
5693 -- is replaced with the discriminal of the enclosing type.
5695 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
5696 -- Check both bounds
5698 -----------------------
5699 -- Conforming_Bounds --
5700 -----------------------
5702 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
5704 if Is_Entity_Name
(B1
)
5705 and then Is_Entity_Name
(B2
)
5706 and then Ekind
(Entity
(B1
)) = E_Discriminant
5708 return Chars
(B1
) = Chars
(B2
);
5711 return Fully_Conformant_Expressions
(B1
, B2
);
5713 end Conforming_Bounds
;
5715 -----------------------
5716 -- Conforming_Ranges --
5717 -----------------------
5719 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
5722 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
5724 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
5725 end Conforming_Ranges
;
5727 -- Start of processing for Fully_Conformant_Discrete_Subtypes
5730 if Nkind
(S1
) /= Nkind
(S2
) then
5733 elsif Is_Entity_Name
(S1
) then
5734 return Entity
(S1
) = Entity
(S2
);
5736 elsif Nkind
(S1
) = N_Range
then
5737 return Conforming_Ranges
(S1
, S2
);
5739 elsif Nkind
(S1
) = N_Subtype_Indication
then
5741 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
5744 (Range_Expression
(Constraint
(S1
)),
5745 Range_Expression
(Constraint
(S2
)));
5749 end Fully_Conformant_Discrete_Subtypes
;
5751 --------------------
5752 -- Install_Entity --
5753 --------------------
5755 procedure Install_Entity
(E
: Entity_Id
) is
5756 Prev
: constant Entity_Id
:= Current_Entity
(E
);
5758 Set_Is_Immediately_Visible
(E
);
5759 Set_Current_Entity
(E
);
5760 Set_Homonym
(E
, Prev
);
5763 ---------------------
5764 -- Install_Formals --
5765 ---------------------
5767 procedure Install_Formals
(Id
: Entity_Id
) is
5770 F
:= First_Formal
(Id
);
5771 while Present
(F
) loop
5775 end Install_Formals
;
5777 -----------------------------
5778 -- Is_Interface_Conformant --
5779 -----------------------------
5781 function Is_Interface_Conformant
5782 (Tagged_Type
: Entity_Id
;
5783 Iface_Prim
: Entity_Id
;
5784 Prim
: Entity_Id
) return Boolean
5786 Iface
: constant Entity_Id
:= Find_Dispatching_Type
(Iface_Prim
);
5787 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
5790 pragma Assert
(Is_Subprogram
(Iface_Prim
)
5791 and then Is_Subprogram
(Prim
)
5792 and then Is_Dispatching_Operation
(Iface_Prim
)
5793 and then Is_Dispatching_Operation
(Prim
));
5795 pragma Assert
(Is_Interface
(Iface
)
5796 or else (Present
(Alias
(Iface_Prim
))
5799 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
5801 if Prim
= Iface_Prim
5802 or else not Is_Subprogram
(Prim
)
5803 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
5804 or else not Is_Dispatching_Operation
(Prim
)
5805 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
5807 or else Base_Type
(Typ
) /= Tagged_Type
5808 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
5812 -- Case of a procedure, or a function that does not have a controlling
5813 -- result (I or access I).
5815 elsif Ekind
(Iface_Prim
) = E_Procedure
5816 or else Etype
(Prim
) = Etype
(Iface_Prim
)
5817 or else not Has_Controlling_Result
(Prim
)
5819 return Type_Conformant
(Prim
, Iface_Prim
,
5820 Skip_Controlling_Formals
=> True);
5822 -- Case of a function returning an interface, or an access to one.
5823 -- Check that the return types correspond.
5825 elsif Implements_Interface
(Typ
, Iface
) then
5826 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
5828 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
5833 Type_Conformant
(Prim
, Iface_Prim
,
5834 Skip_Controlling_Formals
=> True);
5840 end Is_Interface_Conformant
;
5842 ---------------------------------
5843 -- Is_Non_Overriding_Operation --
5844 ---------------------------------
5846 function Is_Non_Overriding_Operation
5847 (Prev_E
: Entity_Id
;
5848 New_E
: Entity_Id
) return Boolean
5852 G_Typ
: Entity_Id
:= Empty
;
5854 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
5855 -- If F_Type is a derived type associated with a generic actual subtype,
5856 -- then return its Generic_Parent_Type attribute, else return Empty.
5858 function Types_Correspond
5859 (P_Type
: Entity_Id
;
5860 N_Type
: Entity_Id
) return Boolean;
5861 -- Returns true if and only if the types (or designated types in the
5862 -- case of anonymous access types) are the same or N_Type is derived
5863 -- directly or indirectly from P_Type.
5865 -----------------------------
5866 -- Get_Generic_Parent_Type --
5867 -----------------------------
5869 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
5874 if Is_Derived_Type
(F_Typ
)
5875 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
5877 -- The tree must be traversed to determine the parent subtype in
5878 -- the generic unit, which unfortunately isn't always available
5879 -- via semantic attributes. ??? (Note: The use of Original_Node
5880 -- is needed for cases where a full derived type has been
5883 Indic
:= Subtype_Indication
5884 (Type_Definition
(Original_Node
(Parent
(F_Typ
))));
5886 if Nkind
(Indic
) = N_Subtype_Indication
then
5887 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
5889 G_Typ
:= Entity
(Indic
);
5892 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
5893 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
5895 return Generic_Parent_Type
(Parent
(G_Typ
));
5900 end Get_Generic_Parent_Type
;
5902 ----------------------
5903 -- Types_Correspond --
5904 ----------------------
5906 function Types_Correspond
5907 (P_Type
: Entity_Id
;
5908 N_Type
: Entity_Id
) return Boolean
5910 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
5911 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
5914 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
5915 Prev_Type
:= Designated_Type
(Prev_Type
);
5918 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
5919 New_Type
:= Designated_Type
(New_Type
);
5922 if Prev_Type
= New_Type
then
5925 elsif not Is_Class_Wide_Type
(New_Type
) then
5926 while Etype
(New_Type
) /= New_Type
loop
5927 New_Type
:= Etype
(New_Type
);
5928 if New_Type
= Prev_Type
then
5934 end Types_Correspond
;
5936 -- Start of processing for Is_Non_Overriding_Operation
5939 -- In the case where both operations are implicit derived subprograms
5940 -- then neither overrides the other. This can only occur in certain
5941 -- obscure cases (e.g., derivation from homographs created in a generic
5944 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
5947 elsif Ekind
(Current_Scope
) = E_Package
5948 and then Is_Generic_Instance
(Current_Scope
)
5949 and then In_Private_Part
(Current_Scope
)
5950 and then Comes_From_Source
(New_E
)
5952 -- We examine the formals and result subtype of the inherited
5953 -- operation, to determine whether their type is derived from (the
5954 -- instance of) a generic type.
5956 Formal
:= First_Formal
(Prev_E
);
5958 while Present
(Formal
) loop
5959 F_Typ
:= Base_Type
(Etype
(Formal
));
5961 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
5962 F_Typ
:= Designated_Type
(F_Typ
);
5965 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
5967 Next_Formal
(Formal
);
5970 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
5971 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
5978 -- If the generic type is a private type, then the original
5979 -- operation was not overriding in the generic, because there was
5980 -- no primitive operation to override.
5982 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
5983 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
5984 N_Formal_Private_Type_Definition
5988 -- The generic parent type is the ancestor of a formal derived
5989 -- type declaration. We need to check whether it has a primitive
5990 -- operation that should be overridden by New_E in the generic.
5994 P_Formal
: Entity_Id
;
5995 N_Formal
: Entity_Id
;
5999 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
6002 while Present
(Prim_Elt
) loop
6003 P_Prim
:= Node
(Prim_Elt
);
6005 if Chars
(P_Prim
) = Chars
(New_E
)
6006 and then Ekind
(P_Prim
) = Ekind
(New_E
)
6008 P_Formal
:= First_Formal
(P_Prim
);
6009 N_Formal
:= First_Formal
(New_E
);
6010 while Present
(P_Formal
) and then Present
(N_Formal
) loop
6011 P_Typ
:= Etype
(P_Formal
);
6012 N_Typ
:= Etype
(N_Formal
);
6014 if not Types_Correspond
(P_Typ
, N_Typ
) then
6018 Next_Entity
(P_Formal
);
6019 Next_Entity
(N_Formal
);
6022 -- Found a matching primitive operation belonging to the
6023 -- formal ancestor type, so the new subprogram is
6027 and then No
(N_Formal
)
6028 and then (Ekind
(New_E
) /= E_Function
6031 (Etype
(P_Prim
), Etype
(New_E
)))
6037 Next_Elmt
(Prim_Elt
);
6040 -- If no match found, then the new subprogram does not
6041 -- override in the generic (nor in the instance).
6049 end Is_Non_Overriding_Operation
;
6051 ------------------------------
6052 -- Make_Inequality_Operator --
6053 ------------------------------
6055 -- S is the defining identifier of an equality operator. We build a
6056 -- subprogram declaration with the right signature. This operation is
6057 -- intrinsic, because it is always expanded as the negation of the
6058 -- call to the equality function.
6060 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
6061 Loc
: constant Source_Ptr
:= Sloc
(S
);
6064 Op_Name
: Entity_Id
;
6066 FF
: constant Entity_Id
:= First_Formal
(S
);
6067 NF
: constant Entity_Id
:= Next_Formal
(FF
);
6070 -- Check that equality was properly defined, ignore call if not
6077 A
: constant Entity_Id
:=
6078 Make_Defining_Identifier
(Sloc
(FF
),
6079 Chars
=> Chars
(FF
));
6081 B
: constant Entity_Id
:=
6082 Make_Defining_Identifier
(Sloc
(NF
),
6083 Chars
=> Chars
(NF
));
6086 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
6088 Formals
:= New_List
(
6089 Make_Parameter_Specification
(Loc
,
6090 Defining_Identifier
=> A
,
6092 New_Reference_To
(Etype
(First_Formal
(S
)),
6093 Sloc
(Etype
(First_Formal
(S
))))),
6095 Make_Parameter_Specification
(Loc
,
6096 Defining_Identifier
=> B
,
6098 New_Reference_To
(Etype
(Next_Formal
(First_Formal
(S
))),
6099 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
6102 Make_Subprogram_Declaration
(Loc
,
6104 Make_Function_Specification
(Loc
,
6105 Defining_Unit_Name
=> Op_Name
,
6106 Parameter_Specifications
=> Formals
,
6107 Result_Definition
=>
6108 New_Reference_To
(Standard_Boolean
, Loc
)));
6110 -- Insert inequality right after equality if it is explicit or after
6111 -- the derived type when implicit. These entities are created only
6112 -- for visibility purposes, and eventually replaced in the course of
6113 -- expansion, so they do not need to be attached to the tree and seen
6114 -- by the back-end. Keeping them internal also avoids spurious
6115 -- freezing problems. The declaration is inserted in the tree for
6116 -- analysis, and removed afterwards. If the equality operator comes
6117 -- from an explicit declaration, attach the inequality immediately
6118 -- after. Else the equality is inherited from a derived type
6119 -- declaration, so insert inequality after that declaration.
6121 if No
(Alias
(S
)) then
6122 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
6123 elsif Is_List_Member
(Parent
(S
)) then
6124 Insert_After
(Parent
(S
), Decl
);
6126 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
6129 Mark_Rewrite_Insertion
(Decl
);
6130 Set_Is_Intrinsic_Subprogram
(Op_Name
);
6133 Set_Has_Completion
(Op_Name
);
6134 Set_Corresponding_Equality
(Op_Name
, S
);
6135 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
6137 end Make_Inequality_Operator
;
6139 ----------------------
6140 -- May_Need_Actuals --
6141 ----------------------
6143 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
6148 F
:= First_Formal
(Fun
);
6150 while Present
(F
) loop
6151 if No
(Default_Value
(F
)) then
6159 Set_Needs_No_Actuals
(Fun
, B
);
6160 end May_Need_Actuals
;
6162 ---------------------
6163 -- Mode_Conformant --
6164 ---------------------
6166 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
6169 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
6171 end Mode_Conformant
;
6173 ---------------------------
6174 -- New_Overloaded_Entity --
6175 ---------------------------
6177 procedure New_Overloaded_Entity
6179 Derived_Type
: Entity_Id
:= Empty
)
6181 Overridden_Subp
: Entity_Id
:= Empty
;
6182 -- Set if the current scope has an operation that is type-conformant
6183 -- with S, and becomes hidden by S.
6185 Is_Primitive_Subp
: Boolean;
6186 -- Set to True if the new subprogram is primitive
6189 -- Entity that S overrides
6191 Prev_Vis
: Entity_Id
:= Empty
;
6192 -- Predecessor of E in Homonym chain
6194 procedure Check_For_Primitive_Subprogram
6195 (Is_Primitive
: out Boolean;
6196 Is_Overriding
: Boolean := False);
6197 -- If the subprogram being analyzed is a primitive operation of the type
6198 -- of a formal or result, set the Has_Primitive_Operations flag on the
6199 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6200 -- corresponding flag on the entity itself for later use.
6202 procedure Check_Synchronized_Overriding
6203 (Def_Id
: Entity_Id
;
6204 Overridden_Subp
: out Entity_Id
);
6205 -- First determine if Def_Id is an entry or a subprogram either defined
6206 -- in the scope of a task or protected type, or is a primitive of such
6207 -- a type. Check whether Def_Id overrides a subprogram of an interface
6208 -- implemented by the synchronized type, return the overridden entity
6211 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
6212 -- Check that E is declared in the private part of the current package,
6213 -- or in the package body, where it may hide a previous declaration.
6214 -- We can't use In_Private_Part by itself because this flag is also
6215 -- set when freezing entities, so we must examine the place of the
6216 -- declaration in the tree, and recognize wrapper packages as well.
6218 ------------------------------------
6219 -- Check_For_Primitive_Subprogram --
6220 ------------------------------------
6222 procedure Check_For_Primitive_Subprogram
6223 (Is_Primitive
: out Boolean;
6224 Is_Overriding
: Boolean := False)
6230 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
6231 -- Returns true if T is declared in the visible part of
6232 -- the current package scope; otherwise returns false.
6233 -- Assumes that T is declared in a package.
6235 procedure Check_Private_Overriding
(T
: Entity_Id
);
6236 -- Checks that if a primitive abstract subprogram of a visible
6237 -- abstract type is declared in a private part, then it must
6238 -- override an abstract subprogram declared in the visible part.
6239 -- Also checks that if a primitive function with a controlling
6240 -- result is declared in a private part, then it must override
6241 -- a function declared in the visible part.
6243 ------------------------------
6244 -- Check_Private_Overriding --
6245 ------------------------------
6247 procedure Check_Private_Overriding
(T
: Entity_Id
) is
6249 if Ekind
(Current_Scope
) = E_Package
6250 and then In_Private_Part
(Current_Scope
)
6251 and then Visible_Part_Type
(T
)
6252 and then not In_Instance
6254 if Is_Abstract_Type
(T
)
6255 and then Is_Abstract_Subprogram
(S
)
6256 and then (not Is_Overriding
6257 or else not Is_Abstract_Subprogram
(E
))
6259 Error_Msg_N
("abstract subprograms must be visible "
6260 & "(RM 3.9.3(10))!", S
);
6262 elsif Ekind
(S
) = E_Function
6263 and then Is_Tagged_Type
(T
)
6264 and then T
= Base_Type
(Etype
(S
))
6265 and then not Is_Overriding
6268 ("private function with tagged result must"
6269 & " override visible-part function", S
);
6271 ("\move subprogram to the visible part"
6272 & " (RM 3.9.3(10))", S
);
6275 end Check_Private_Overriding
;
6277 -----------------------
6278 -- Visible_Part_Type --
6279 -----------------------
6281 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
6282 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
6286 -- If the entity is a private type, then it must be
6287 -- declared in a visible part.
6289 if Ekind
(T
) in Private_Kind
then
6293 -- Otherwise, we traverse the visible part looking for its
6294 -- corresponding declaration. We cannot use the declaration
6295 -- node directly because in the private part the entity of a
6296 -- private type is the one in the full view, which does not
6297 -- indicate that it is the completion of something visible.
6299 N
:= First
(Visible_Declarations
(Specification
(P
)));
6300 while Present
(N
) loop
6301 if Nkind
(N
) = N_Full_Type_Declaration
6302 and then Present
(Defining_Identifier
(N
))
6303 and then T
= Defining_Identifier
(N
)
6307 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
6308 N_Private_Extension_Declaration
)
6309 and then Present
(Defining_Identifier
(N
))
6310 and then T
= Full_View
(Defining_Identifier
(N
))
6319 end Visible_Part_Type
;
6321 -- Start of processing for Check_For_Primitive_Subprogram
6324 Is_Primitive
:= False;
6326 if not Comes_From_Source
(S
) then
6329 -- If subprogram is at library level, it is not primitive operation
6331 elsif Current_Scope
= Standard_Standard
then
6334 elsif ((Ekind
(Current_Scope
) = E_Package
6335 or else Ekind
(Current_Scope
) = E_Generic_Package
)
6336 and then not In_Package_Body
(Current_Scope
))
6337 or else Is_Overriding
6339 -- For function, check return type
6341 if Ekind
(S
) = E_Function
then
6342 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
6343 F_Typ
:= Designated_Type
(Etype
(S
));
6348 B_Typ
:= Base_Type
(F_Typ
);
6350 if Scope
(B_Typ
) = Current_Scope
6351 and then not Is_Class_Wide_Type
(B_Typ
)
6352 and then not Is_Generic_Type
(B_Typ
)
6354 Is_Primitive
:= True;
6355 Set_Has_Primitive_Operations
(B_Typ
);
6356 Set_Is_Primitive
(S
);
6357 Check_Private_Overriding
(B_Typ
);
6361 -- For all subprograms, check formals
6363 Formal
:= First_Formal
(S
);
6364 while Present
(Formal
) loop
6365 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
6366 F_Typ
:= Designated_Type
(Etype
(Formal
));
6368 F_Typ
:= Etype
(Formal
);
6371 B_Typ
:= Base_Type
(F_Typ
);
6373 if Ekind
(B_Typ
) = E_Access_Subtype
then
6374 B_Typ
:= Base_Type
(B_Typ
);
6377 if Scope
(B_Typ
) = Current_Scope
6378 and then not Is_Class_Wide_Type
(B_Typ
)
6379 and then not Is_Generic_Type
(B_Typ
)
6381 Is_Primitive
:= True;
6382 Set_Is_Primitive
(S
);
6383 Set_Has_Primitive_Operations
(B_Typ
);
6384 Check_Private_Overriding
(B_Typ
);
6387 Next_Formal
(Formal
);
6390 end Check_For_Primitive_Subprogram
;
6392 -----------------------------------
6393 -- Check_Synchronized_Overriding --
6394 -----------------------------------
6396 procedure Check_Synchronized_Overriding
6397 (Def_Id
: Entity_Id
;
6398 Overridden_Subp
: out Entity_Id
)
6400 Ifaces_List
: Elist_Id
;
6404 function Has_Correct_Formal_Mode
6405 (Tag_Typ
: Entity_Id
;
6406 Subp
: Entity_Id
) return Boolean;
6407 -- For an overridden subprogram Subp, check whether the mode of its
6408 -- first parameter is correct depending on the kind of Tag_Typ.
6410 function Matches_Prefixed_View_Profile
6411 (Prim_Params
: List_Id
;
6412 Iface_Params
: List_Id
) return Boolean;
6413 -- Determine whether a subprogram's parameter profile Prim_Params
6414 -- matches that of a potentially overridden interface subprogram
6415 -- Iface_Params. Also determine if the type of first parameter of
6416 -- Iface_Params is an implemented interface.
6418 -----------------------------
6419 -- Has_Correct_Formal_Mode --
6420 -----------------------------
6422 function Has_Correct_Formal_Mode
6423 (Tag_Typ
: Entity_Id
;
6424 Subp
: Entity_Id
) return Boolean
6426 Formal
: constant Node_Id
:= First_Formal
(Subp
);
6429 -- In order for an entry or a protected procedure to override, the
6430 -- first parameter of the overridden routine must be of mode
6431 -- "out", "in out" or access-to-variable.
6433 if (Ekind
(Subp
) = E_Entry
6434 or else Ekind
(Subp
) = E_Procedure
)
6435 and then Is_Protected_Type
(Tag_Typ
)
6436 and then Ekind
(Formal
) /= E_In_Out_Parameter
6437 and then Ekind
(Formal
) /= E_Out_Parameter
6438 and then Nkind
(Parameter_Type
(Parent
(Formal
))) /=
6444 -- All other cases are OK since a task entry or routine does not
6445 -- have a restriction on the mode of the first parameter of the
6446 -- overridden interface routine.
6449 end Has_Correct_Formal_Mode
;
6451 -----------------------------------
6452 -- Matches_Prefixed_View_Profile --
6453 -----------------------------------
6455 function Matches_Prefixed_View_Profile
6456 (Prim_Params
: List_Id
;
6457 Iface_Params
: List_Id
) return Boolean
6459 Iface_Id
: Entity_Id
;
6460 Iface_Param
: Node_Id
;
6461 Iface_Typ
: Entity_Id
;
6462 Prim_Id
: Entity_Id
;
6463 Prim_Param
: Node_Id
;
6464 Prim_Typ
: Entity_Id
;
6466 function Is_Implemented
6467 (Ifaces_List
: Elist_Id
;
6468 Iface
: Entity_Id
) return Boolean;
6469 -- Determine if Iface is implemented by the current task or
6472 --------------------
6473 -- Is_Implemented --
6474 --------------------
6476 function Is_Implemented
6477 (Ifaces_List
: Elist_Id
;
6478 Iface
: Entity_Id
) return Boolean
6480 Iface_Elmt
: Elmt_Id
;
6483 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
6484 while Present
(Iface_Elmt
) loop
6485 if Node
(Iface_Elmt
) = Iface
then
6489 Next_Elmt
(Iface_Elmt
);
6495 -- Start of processing for Matches_Prefixed_View_Profile
6498 Iface_Param
:= First
(Iface_Params
);
6499 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
6501 if Is_Access_Type
(Iface_Typ
) then
6502 Iface_Typ
:= Designated_Type
(Iface_Typ
);
6505 Prim_Param
:= First
(Prim_Params
);
6507 -- The first parameter of the potentially overridden subprogram
6508 -- must be an interface implemented by Prim.
6510 if not Is_Interface
(Iface_Typ
)
6511 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
6516 -- The checks on the object parameters are done, move onto the
6517 -- rest of the parameters.
6519 if not In_Scope
then
6520 Prim_Param
:= Next
(Prim_Param
);
6523 Iface_Param
:= Next
(Iface_Param
);
6524 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
6525 Iface_Id
:= Defining_Identifier
(Iface_Param
);
6526 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
6528 if Is_Access_Type
(Iface_Typ
) then
6529 Iface_Typ
:= Directly_Designated_Type
(Iface_Typ
);
6532 Prim_Id
:= Defining_Identifier
(Prim_Param
);
6533 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
6535 if Is_Access_Type
(Prim_Typ
) then
6536 Prim_Typ
:= Directly_Designated_Type
(Prim_Typ
);
6539 -- Case of multiple interface types inside a parameter profile
6541 -- (Obj_Param : in out Iface; ...; Param : Iface)
6543 -- If the interface type is implemented, then the matching type
6544 -- in the primitive should be the implementing record type.
6546 if Ekind
(Iface_Typ
) = E_Record_Type
6547 and then Is_Interface
(Iface_Typ
)
6548 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
6550 if Prim_Typ
/= Typ
then
6554 -- The two parameters must be both mode and subtype conformant
6556 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
6558 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
6567 -- One of the two lists contains more parameters than the other
6569 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
6574 end Matches_Prefixed_View_Profile
;
6576 -- Start of processing for Check_Synchronized_Overriding
6579 Overridden_Subp
:= Empty
;
6581 -- Def_Id must be an entry or a subprogram. We should skip predefined
6582 -- primitives internally generated by the frontend; however at this
6583 -- stage predefined primitives are still not fully decorated. As a
6584 -- minor optimization we skip here internally generated subprograms.
6586 if (Ekind
(Def_Id
) /= E_Entry
6587 and then Ekind
(Def_Id
) /= E_Function
6588 and then Ekind
(Def_Id
) /= E_Procedure
)
6589 or else not Comes_From_Source
(Def_Id
)
6594 -- Search for the concurrent declaration since it contains the list
6595 -- of all implemented interfaces. In this case, the subprogram is
6596 -- declared within the scope of a protected or a task type.
6598 if Present
(Scope
(Def_Id
))
6599 and then Is_Concurrent_Type
(Scope
(Def_Id
))
6600 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
6602 Typ
:= Scope
(Def_Id
);
6605 -- The enclosing scope is not a synchronized type and the subprogram
6608 elsif No
(First_Formal
(Def_Id
)) then
6611 -- The subprogram has formals and hence it may be a primitive of a
6615 Typ
:= Etype
(First_Formal
(Def_Id
));
6617 if Is_Access_Type
(Typ
) then
6618 Typ
:= Directly_Designated_Type
(Typ
);
6621 if Is_Concurrent_Type
(Typ
)
6622 and then not Is_Generic_Actual_Type
(Typ
)
6626 -- This case occurs when the concurrent type is declared within
6627 -- a generic unit. As a result the corresponding record has been
6628 -- built and used as the type of the first formal, we just have
6629 -- to retrieve the corresponding concurrent type.
6631 elsif Is_Concurrent_Record_Type
(Typ
)
6632 and then Present
(Corresponding_Concurrent_Type
(Typ
))
6634 Typ
:= Corresponding_Concurrent_Type
(Typ
);
6642 -- There is no overriding to check if is an inherited operation in a
6643 -- type derivation on for a generic actual.
6645 Collect_Interfaces
(Typ
, Ifaces_List
);
6647 if Is_Empty_Elmt_List
(Ifaces_List
) then
6651 -- Determine whether entry or subprogram Def_Id overrides a primitive
6652 -- operation that belongs to one of the interfaces in Ifaces_List.
6655 Candidate
: Entity_Id
:= Empty
;
6656 Hom
: Entity_Id
:= Empty
;
6657 Iface_Typ
: Entity_Id
;
6658 Subp
: Entity_Id
:= Empty
;
6661 -- Traverse the homonym chain, looking at a potentially
6662 -- overridden subprogram that belongs to an implemented
6665 Hom
:= Current_Entity_In_Scope
(Def_Id
);
6666 while Present
(Hom
) loop
6669 -- Entries can override abstract or null interface
6672 if Ekind
(Def_Id
) = E_Entry
6673 and then Ekind
(Subp
) = E_Procedure
6674 and then Nkind
(Parent
(Subp
)) = N_Procedure_Specification
6675 and then (Is_Abstract_Subprogram
(Subp
)
6676 or else Null_Present
(Parent
(Subp
)))
6678 while Present
(Alias
(Subp
)) loop
6679 Subp
:= Alias
(Subp
);
6682 if Matches_Prefixed_View_Profile
6683 (Parameter_Specifications
(Parent
(Def_Id
)),
6684 Parameter_Specifications
(Parent
(Subp
)))
6690 if Has_Correct_Formal_Mode
(Typ
, Candidate
) then
6691 Overridden_Subp
:= Candidate
;
6696 -- Procedures can override abstract or null interface
6699 elsif Ekind
(Def_Id
) = E_Procedure
6700 and then Ekind
(Subp
) = E_Procedure
6701 and then Nkind
(Parent
(Subp
)) = N_Procedure_Specification
6702 and then (Is_Abstract_Subprogram
(Subp
)
6703 or else Null_Present
(Parent
(Subp
)))
6704 and then Matches_Prefixed_View_Profile
6705 (Parameter_Specifications
(Parent
(Def_Id
)),
6706 Parameter_Specifications
(Parent
(Subp
)))
6712 if Has_Correct_Formal_Mode
(Typ
, Candidate
) then
6713 Overridden_Subp
:= Candidate
;
6717 -- Functions can override abstract interface functions
6719 elsif Ekind
(Def_Id
) = E_Function
6720 and then Ekind
(Subp
) = E_Function
6721 and then Nkind
(Parent
(Subp
)) = N_Function_Specification
6722 and then Is_Abstract_Subprogram
(Subp
)
6723 and then Matches_Prefixed_View_Profile
6724 (Parameter_Specifications
(Parent
(Def_Id
)),
6725 Parameter_Specifications
(Parent
(Subp
)))
6726 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
6727 Etype
(Result_Definition
(Parent
(Subp
)))
6729 Overridden_Subp
:= Subp
;
6733 Hom
:= Homonym
(Hom
);
6736 -- After examining all candidates for overriding, we are
6737 -- left with the best match which is a mode incompatible
6738 -- interface routine. Do not emit an error if the Expander
6739 -- is active since this error will be detected later on
6740 -- after all concurrent types are expanded and all wrappers
6741 -- are built. This check is meant for spec-only
6744 if Present
(Candidate
)
6745 and then not Expander_Active
6748 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
6750 -- Def_Id is primitive of a protected type, declared
6751 -- inside the type, and the candidate is primitive of a
6752 -- limited or synchronized interface.
6755 and then Is_Protected_Type
(Typ
)
6757 (Is_Limited_Interface
(Iface_Typ
)
6758 or else Is_Protected_Interface
(Iface_Typ
)
6759 or else Is_Synchronized_Interface
(Iface_Typ
)
6760 or else Is_Task_Interface
(Iface_Typ
))
6762 -- Must reword this message, comma before to in -gnatj
6766 ("first formal of & must be of mode `OUT`, `IN OUT`"
6767 & " or access-to-variable", Typ
, Candidate
);
6769 ("\to be overridden by protected procedure or entry "
6770 & "(RM 9.4(11.9/2))", Typ
);
6774 Overridden_Subp
:= Candidate
;
6777 end Check_Synchronized_Overriding
;
6779 ----------------------------
6780 -- Is_Private_Declaration --
6781 ----------------------------
6783 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
6784 Priv_Decls
: List_Id
;
6785 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
6788 if Is_Package_Or_Generic_Package
(Current_Scope
)
6789 and then In_Private_Part
(Current_Scope
)
6792 Private_Declarations
(
6793 Specification
(Unit_Declaration_Node
(Current_Scope
)));
6795 return In_Package_Body
(Current_Scope
)
6797 (Is_List_Member
(Decl
)
6798 and then List_Containing
(Decl
) = Priv_Decls
)
6799 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
6800 and then not Is_Compilation_Unit
(
6801 Defining_Entity
(Parent
(Decl
)))
6802 and then List_Containing
(Parent
(Parent
(Decl
)))
6807 end Is_Private_Declaration
;
6809 -- Start of processing for New_Overloaded_Entity
6812 -- We need to look for an entity that S may override. This must be a
6813 -- homonym in the current scope, so we look for the first homonym of
6814 -- S in the current scope as the starting point for the search.
6816 E
:= Current_Entity_In_Scope
(S
);
6818 -- If there is no homonym then this is definitely not overriding
6821 Enter_Overloaded_Entity
(S
);
6822 Check_Dispatching_Operation
(S
, Empty
);
6823 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
6825 -- If subprogram has an explicit declaration, check whether it
6826 -- has an overriding indicator.
6828 if Comes_From_Source
(S
) then
6829 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
6830 Check_Overriding_Indicator
6831 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
6834 -- If there is a homonym that is not overloadable, then we have an
6835 -- error, except for the special cases checked explicitly below.
6837 elsif not Is_Overloadable
(E
) then
6839 -- Check for spurious conflict produced by a subprogram that has the
6840 -- same name as that of the enclosing generic package. The conflict
6841 -- occurs within an instance, between the subprogram and the renaming
6842 -- declaration for the package. After the subprogram, the package
6843 -- renaming declaration becomes hidden.
6845 if Ekind
(E
) = E_Package
6846 and then Present
(Renamed_Object
(E
))
6847 and then Renamed_Object
(E
) = Current_Scope
6848 and then Nkind
(Parent
(Renamed_Object
(E
))) =
6849 N_Package_Specification
6850 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
6853 Set_Is_Immediately_Visible
(E
, False);
6854 Enter_Overloaded_Entity
(S
);
6855 Set_Homonym
(S
, Homonym
(E
));
6856 Check_Dispatching_Operation
(S
, Empty
);
6857 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
6859 -- If the subprogram is implicit it is hidden by the previous
6860 -- declaration. However if it is dispatching, it must appear in the
6861 -- dispatch table anyway, because it can be dispatched to even if it
6862 -- cannot be called directly.
6864 elsif Present
(Alias
(S
))
6865 and then not Comes_From_Source
(S
)
6867 Set_Scope
(S
, Current_Scope
);
6869 if Is_Dispatching_Operation
(Alias
(S
)) then
6870 Check_Dispatching_Operation
(S
, Empty
);
6876 Error_Msg_Sloc
:= Sloc
(E
);
6878 -- Generate message, with useful additional warning if in generic
6880 if Is_Generic_Unit
(E
) then
6881 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
6882 Error_Msg_N
("\& conflicts with declaration#", S
);
6884 Error_Msg_N
("& conflicts with declaration#", S
);
6890 -- E exists and is overloadable
6893 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
6894 -- need no check against the homonym chain. They are directly added
6895 -- to the list of primitive operations of Derived_Type.
6897 if Ada_Version
>= Ada_05
6898 and then Present
(Derived_Type
)
6899 and then Is_Dispatching_Operation
(Alias
(S
))
6900 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
6901 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
6903 goto Add_New_Entity
;
6906 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
6908 -- Loop through E and its homonyms to determine if any of them is
6909 -- the candidate for overriding by S.
6911 while Present
(E
) loop
6913 -- Definitely not interesting if not in the current scope
6915 if Scope
(E
) /= Current_Scope
then
6918 -- Check if we have type conformance
6920 elsif Type_Conformant
(E
, S
) then
6922 -- If the old and new entities have the same profile and one
6923 -- is not the body of the other, then this is an error, unless
6924 -- one of them is implicitly declared.
6926 -- There are some cases when both can be implicit, for example
6927 -- when both a literal and a function that overrides it are
6928 -- inherited in a derivation, or when an inherited operation
6929 -- of a tagged full type overrides the inherited operation of
6930 -- a private extension. Ada 83 had a special rule for the
6931 -- literal case. In Ada95, the later implicit operation hides
6932 -- the former, and the literal is always the former. In the
6933 -- odd case where both are derived operations declared at the
6934 -- same point, both operations should be declared, and in that
6935 -- case we bypass the following test and proceed to the next
6936 -- part (this can only occur for certain obscure cases
6937 -- involving homographs in instances and can't occur for
6938 -- dispatching operations ???). Note that the following
6939 -- condition is less than clear. For example, it's not at all
6940 -- clear why there's a test for E_Entry here. ???
6942 if Present
(Alias
(S
))
6943 and then (No
(Alias
(E
))
6944 or else Comes_From_Source
(E
)
6945 or else Is_Dispatching_Operation
(E
))
6947 (Ekind
(E
) = E_Entry
6948 or else Ekind
(E
) /= E_Enumeration_Literal
)
6950 -- When an derived operation is overloaded it may be due to
6951 -- the fact that the full view of a private extension
6952 -- re-inherits. It has to be dealt with.
6954 if Is_Package_Or_Generic_Package
(Current_Scope
)
6955 and then In_Private_Part
(Current_Scope
)
6957 Check_Operation_From_Private_View
(S
, E
);
6960 -- In any case the implicit operation remains hidden by
6961 -- the existing declaration, which is overriding.
6963 Set_Is_Overriding_Operation
(E
);
6965 if Comes_From_Source
(E
) then
6966 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
6968 -- Indicate that E overrides the operation from which
6971 if Present
(Alias
(S
)) then
6972 Set_Overridden_Operation
(E
, Alias
(S
));
6974 Set_Overridden_Operation
(E
, S
);
6980 -- Within an instance, the renaming declarations for
6981 -- actual subprograms may become ambiguous, but they do
6982 -- not hide each other.
6984 elsif Ekind
(E
) /= E_Entry
6985 and then not Comes_From_Source
(E
)
6986 and then not Is_Generic_Instance
(E
)
6987 and then (Present
(Alias
(E
))
6988 or else Is_Intrinsic_Subprogram
(E
))
6989 and then (not In_Instance
6990 or else No
(Parent
(E
))
6991 or else Nkind
(Unit_Declaration_Node
(E
)) /=
6992 N_Subprogram_Renaming_Declaration
)
6994 -- A subprogram child unit is not allowed to override
6995 -- an inherited subprogram (10.1.1(20)).
6997 if Is_Child_Unit
(S
) then
6999 ("child unit overrides inherited subprogram in parent",
7004 if Is_Non_Overriding_Operation
(E
, S
) then
7005 Enter_Overloaded_Entity
(S
);
7006 if No
(Derived_Type
)
7007 or else Is_Tagged_Type
(Derived_Type
)
7009 Check_Dispatching_Operation
(S
, Empty
);
7015 -- E is a derived operation or an internal operator which
7016 -- is being overridden. Remove E from further visibility.
7017 -- Furthermore, if E is a dispatching operation, it must be
7018 -- replaced in the list of primitive operations of its type
7019 -- (see Override_Dispatching_Operation).
7021 Overridden_Subp
:= E
;
7027 Prev
:= First_Entity
(Current_Scope
);
7029 while Present
(Prev
)
7030 and then Next_Entity
(Prev
) /= E
7035 -- It is possible for E to be in the current scope and
7036 -- yet not in the entity chain. This can only occur in a
7037 -- generic context where E is an implicit concatenation
7038 -- in the formal part, because in a generic body the
7039 -- entity chain starts with the formals.
7042 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
7044 -- E must be removed both from the entity_list of the
7045 -- current scope, and from the visibility chain
7047 if Debug_Flag_E
then
7048 Write_Str
("Override implicit operation ");
7049 Write_Int
(Int
(E
));
7053 -- If E is a predefined concatenation, it stands for four
7054 -- different operations. As a result, a single explicit
7055 -- declaration does not hide it. In a possible ambiguous
7056 -- situation, Disambiguate chooses the user-defined op,
7057 -- so it is correct to retain the previous internal one.
7059 if Chars
(E
) /= Name_Op_Concat
7060 or else Ekind
(E
) /= E_Operator
7062 -- For nondispatching derived operations that are
7063 -- overridden by a subprogram declared in the private
7064 -- part of a package, we retain the derived
7065 -- subprogram but mark it as not immediately visible.
7066 -- If the derived operation was declared in the
7067 -- visible part then this ensures that it will still
7068 -- be visible outside the package with the proper
7069 -- signature (calls from outside must also be
7070 -- directed to this version rather than the
7071 -- overriding one, unlike the dispatching case).
7072 -- Calls from inside the package will still resolve
7073 -- to the overriding subprogram since the derived one
7074 -- is marked as not visible within the package.
7076 -- If the private operation is dispatching, we achieve
7077 -- the overriding by keeping the implicit operation
7078 -- but setting its alias to be the overriding one. In
7079 -- this fashion the proper body is executed in all
7080 -- cases, but the original signature is used outside
7083 -- If the overriding is not in the private part, we
7084 -- remove the implicit operation altogether.
7086 if Is_Private_Declaration
(S
) then
7088 if not Is_Dispatching_Operation
(E
) then
7089 Set_Is_Immediately_Visible
(E
, False);
7091 -- Work done in Override_Dispatching_Operation,
7092 -- so nothing else need to be done here.
7098 -- Find predecessor of E in Homonym chain
7100 if E
= Current_Entity
(E
) then
7103 Prev_Vis
:= Current_Entity
(E
);
7104 while Homonym
(Prev_Vis
) /= E
loop
7105 Prev_Vis
:= Homonym
(Prev_Vis
);
7109 if Prev_Vis
/= Empty
then
7111 -- Skip E in the visibility chain
7113 Set_Homonym
(Prev_Vis
, Homonym
(E
));
7116 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7119 Set_Next_Entity
(Prev
, Next_Entity
(E
));
7121 if No
(Next_Entity
(Prev
)) then
7122 Set_Last_Entity
(Current_Scope
, Prev
);
7128 Enter_Overloaded_Entity
(S
);
7129 Set_Is_Overriding_Operation
(S
);
7130 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
7132 -- Indicate that S overrides the operation from which
7135 if Comes_From_Source
(S
) then
7136 if Present
(Alias
(E
)) then
7137 Set_Overridden_Operation
(S
, Alias
(E
));
7139 Set_Overridden_Operation
(S
, E
);
7143 if Is_Dispatching_Operation
(E
) then
7145 -- An overriding dispatching subprogram inherits the
7146 -- convention of the overridden subprogram (by
7149 Set_Convention
(S
, Convention
(E
));
7150 Check_Dispatching_Operation
(S
, E
);
7153 Check_Dispatching_Operation
(S
, Empty
);
7156 Check_For_Primitive_Subprogram
7157 (Is_Primitive_Subp
, Is_Overriding
=> True);
7158 goto Check_Inequality
;
7161 -- Apparent redeclarations in instances can occur when two
7162 -- formal types get the same actual type. The subprograms in
7163 -- in the instance are legal, even if not callable from the
7164 -- outside. Calls from within are disambiguated elsewhere.
7165 -- For dispatching operations in the visible part, the usual
7166 -- rules apply, and operations with the same profile are not
7169 elsif (In_Instance_Visible_Part
7170 and then not Is_Dispatching_Operation
(E
))
7171 or else In_Instance_Not_Visible
7175 -- Here we have a real error (identical profile)
7178 Error_Msg_Sloc
:= Sloc
(E
);
7180 -- Avoid cascaded errors if the entity appears in
7181 -- subsequent calls.
7183 Set_Scope
(S
, Current_Scope
);
7185 -- Generate error, with extra useful warning for the case
7186 -- of a generic instance with no completion.
7188 if Is_Generic_Instance
(S
)
7189 and then not Has_Completion
(E
)
7192 ("instantiation cannot provide body for&", S
);
7193 Error_Msg_N
("\& conflicts with declaration#", S
);
7195 Error_Msg_N
("& conflicts with declaration#", S
);
7202 -- If one subprogram has an access parameter and the other
7203 -- a parameter of an access type, calls to either might be
7204 -- ambiguous. Verify that parameters match except for the
7205 -- access parameter.
7207 if May_Hide_Profile
then
7212 F1
:= First_Formal
(S
);
7213 F2
:= First_Formal
(E
);
7214 while Present
(F1
) and then Present
(F2
) loop
7215 if Is_Access_Type
(Etype
(F1
)) then
7216 if not Is_Access_Type
(Etype
(F2
))
7217 or else not Conforming_Types
7218 (Designated_Type
(Etype
(F1
)),
7219 Designated_Type
(Etype
(F2
)),
7222 May_Hide_Profile
:= False;
7226 not Conforming_Types
7227 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
7229 May_Hide_Profile
:= False;
7240 Error_Msg_NE
("calls to& may be ambiguous?", S
, S
);
7251 -- On exit, we know that S is a new entity
7253 Enter_Overloaded_Entity
(S
);
7254 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7255 Check_Overriding_Indicator
7256 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7258 -- If S is a derived operation for an untagged type then by
7259 -- definition it's not a dispatching operation (even if the parent
7260 -- operation was dispatching), so we don't call
7261 -- Check_Dispatching_Operation in that case.
7263 if No
(Derived_Type
)
7264 or else Is_Tagged_Type
(Derived_Type
)
7266 Check_Dispatching_Operation
(S
, Empty
);
7270 -- If this is a user-defined equality operator that is not a derived
7271 -- subprogram, create the corresponding inequality. If the operation is
7272 -- dispatching, the expansion is done elsewhere, and we do not create
7273 -- an explicit inequality operation.
7275 <<Check_Inequality
>>
7276 if Chars
(S
) = Name_Op_Eq
7277 and then Etype
(S
) = Standard_Boolean
7278 and then Present
(Parent
(S
))
7279 and then not Is_Dispatching_Operation
(S
)
7281 Make_Inequality_Operator
(S
);
7283 end New_Overloaded_Entity
;
7285 ---------------------
7286 -- Process_Formals --
7287 ---------------------
7289 procedure Process_Formals
7291 Related_Nod
: Node_Id
)
7293 Param_Spec
: Node_Id
;
7295 Formal_Type
: Entity_Id
;
7299 Num_Out_Params
: Nat
:= 0;
7300 First_Out_Param
: Entity_Id
:= Empty
;
7301 -- Used for setting Is_Only_Out_Parameter
7303 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
7304 -- Check whether the default has a class-wide type. After analysis the
7305 -- default has the type of the formal, so we must also check explicitly
7306 -- for an access attribute.
7308 ---------------------------
7309 -- Is_Class_Wide_Default --
7310 ---------------------------
7312 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
7314 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
7315 or else (Nkind
(D
) = N_Attribute_Reference
7316 and then Attribute_Name
(D
) = Name_Access
7317 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
7318 end Is_Class_Wide_Default
;
7320 -- Start of processing for Process_Formals
7323 -- In order to prevent premature use of the formals in the same formal
7324 -- part, the Ekind is left undefined until all default expressions are
7325 -- analyzed. The Ekind is established in a separate loop at the end.
7327 Param_Spec
:= First
(T
);
7328 while Present
(Param_Spec
) loop
7329 Formal
:= Defining_Identifier
(Param_Spec
);
7330 Set_Never_Set_In_Source
(Formal
, True);
7331 Enter_Name
(Formal
);
7333 -- Case of ordinary parameters
7335 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
7336 Find_Type
(Parameter_Type
(Param_Spec
));
7337 Ptype
:= Parameter_Type
(Param_Spec
);
7339 if Ptype
= Error
then
7343 Formal_Type
:= Entity
(Ptype
);
7345 if Is_Incomplete_Type
(Formal_Type
)
7347 (Is_Class_Wide_Type
(Formal_Type
)
7348 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
7350 -- Ada 2005 (AI-326): Tagged incomplete types allowed
7352 if Is_Tagged_Type
(Formal_Type
) then
7355 -- Special handling of Value_Type for CIL case
7357 elsif Is_Value_Type
(Formal_Type
) then
7360 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
7361 N_Access_Procedure_Definition
)
7363 Error_Msg_N
("invalid use of incomplete type", Param_Spec
);
7365 -- An incomplete type that is not tagged is allowed in an
7366 -- access-to-subprogram type only if it is a local declaration
7367 -- with a forthcoming completion (3.10.1 (9.2/2)).
7369 elsif Scope
(Formal_Type
) /= Scope
(Current_Scope
) then
7371 ("invalid use of limited view of type", Param_Spec
);
7374 elsif Ekind
(Formal_Type
) = E_Void
then
7375 Error_Msg_NE
("premature use of&",
7376 Parameter_Type
(Param_Spec
), Formal_Type
);
7379 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7380 -- declaration corresponding to the null-excluding type of the
7381 -- formal in the enclosing scope. Finally, replace the parameter
7382 -- type of the formal with the internal subtype.
7384 if Ada_Version
>= Ada_05
7385 and then Null_Exclusion_Present
(Param_Spec
)
7387 if not Is_Access_Type
(Formal_Type
) then
7389 ("`NOT NULL` allowed only for an access type", Param_Spec
);
7392 if Can_Never_Be_Null
(Formal_Type
)
7393 and then Comes_From_Source
(Related_Nod
)
7396 ("`NOT NULL` not allowed (& already excludes null)",
7402 Create_Null_Excluding_Itype
7404 Related_Nod
=> Related_Nod
,
7405 Scope_Id
=> Scope
(Current_Scope
));
7407 -- If the designated type of the itype is an itype we
7408 -- decorate it with the Has_Delayed_Freeze attribute to
7409 -- avoid problems with the backend.
7412 -- type T is access procedure;
7413 -- procedure Op (O : not null T);
7415 if Is_Itype
(Directly_Designated_Type
(Formal_Type
)) then
7416 Set_Has_Delayed_Freeze
(Formal_Type
);
7421 -- An access formal type
7425 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
7427 -- No need to continue if we already notified errors
7429 if not Present
(Formal_Type
) then
7433 -- Ada 2005 (AI-254)
7436 AD
: constant Node_Id
:=
7437 Access_To_Subprogram_Definition
7438 (Parameter_Type
(Param_Spec
));
7440 if Present
(AD
) and then Protected_Present
(AD
) then
7442 Replace_Anonymous_Access_To_Protected_Subprogram
7448 Set_Etype
(Formal
, Formal_Type
);
7449 Default
:= Expression
(Param_Spec
);
7451 if Present
(Default
) then
7452 if Out_Present
(Param_Spec
) then
7454 ("default initialization only allowed for IN parameters",
7458 -- Do the special preanalysis of the expression (see section on
7459 -- "Handling of Default Expressions" in the spec of package Sem).
7461 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
7463 -- An access to constant cannot be the default for
7464 -- an access parameter that is an access to variable.
7466 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7467 and then not Is_Access_Constant
(Formal_Type
)
7468 and then Is_Access_Type
(Etype
(Default
))
7469 and then Is_Access_Constant
(Etype
(Default
))
7472 ("formal that is access to variable cannot be initialized " &
7473 "with an access-to-constant expression", Default
);
7476 -- Check that the designated type of an access parameter's default
7477 -- is not a class-wide type unless the parameter's designated type
7478 -- is also class-wide.
7480 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7481 and then not From_With_Type
(Formal_Type
)
7482 and then Is_Class_Wide_Default
(Default
)
7483 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
7486 ("access to class-wide expression not allowed here", Default
);
7490 -- Ada 2005 (AI-231): Static checks
7492 if Ada_Version
>= Ada_05
7493 and then Is_Access_Type
(Etype
(Formal
))
7494 and then Can_Never_Be_Null
(Etype
(Formal
))
7496 Null_Exclusion_Static_Checks
(Param_Spec
);
7503 -- If this is the formal part of a function specification, analyze the
7504 -- subtype mark in the context where the formals are visible but not
7505 -- yet usable, and may hide outer homographs.
7507 if Nkind
(Related_Nod
) = N_Function_Specification
then
7508 Analyze_Return_Type
(Related_Nod
);
7511 -- Now set the kind (mode) of each formal
7513 Param_Spec
:= First
(T
);
7515 while Present
(Param_Spec
) loop
7516 Formal
:= Defining_Identifier
(Param_Spec
);
7517 Set_Formal_Mode
(Formal
);
7519 if Ekind
(Formal
) = E_In_Parameter
then
7520 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
7522 if Present
(Expression
(Param_Spec
)) then
7523 Default
:= Expression
(Param_Spec
);
7525 if Is_Scalar_Type
(Etype
(Default
)) then
7527 (Parameter_Type
(Param_Spec
)) /= N_Access_Definition
7529 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
7532 Formal_Type
:= Access_Definition
7533 (Related_Nod
, Parameter_Type
(Param_Spec
));
7536 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
7540 elsif Ekind
(Formal
) = E_Out_Parameter
then
7541 Num_Out_Params
:= Num_Out_Params
+ 1;
7543 if Num_Out_Params
= 1 then
7544 First_Out_Param
:= Formal
;
7547 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
7548 Num_Out_Params
:= Num_Out_Params
+ 1;
7554 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
7555 Set_Is_Only_Out_Parameter
(First_Out_Param
);
7557 end Process_Formals
;
7563 procedure Process_PPCs
7565 Spec_Id
: Entity_Id
;
7566 Body_Id
: Entity_Id
)
7568 Loc
: constant Source_Ptr
:= Sloc
(N
);
7570 Plist
: List_Id
:= No_List
;
7574 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
;
7575 -- Prag contains an analyzed precondition or postcondition pragma.
7576 -- This function copies the pragma, changes it to the corresponding
7577 -- Check pragma and returns the Check pragma as the result. The
7578 -- argument Nam is either Name_Precondition or Name_Postcondition.
7584 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
is
7585 CP
: constant Node_Id
:= New_Copy_Tree
(Prag
);
7588 -- Set Analyzed to false, since we want to reanalyze the check
7589 -- procedure. Note that it is only at the outer level that we
7590 -- do this fiddling, for the spec cases, the already preanalyzed
7591 -- parameters are not affected.
7593 Set_Analyzed
(CP
, False);
7595 -- Change pragma into corresponding pragma Check
7597 Prepend_To
(Pragma_Argument_Associations
(CP
),
7598 Make_Pragma_Argument_Association
(Sloc
(Prag
),
7600 Make_Identifier
(Loc
,
7602 Set_Pragma_Identifier
(CP
,
7603 Make_Identifier
(Sloc
(Prag
),
7604 Chars
=> Name_Check
));
7609 -- Start of processing for Process_PPCs
7612 -- Grab preconditions from spec
7614 if Present
(Spec_Id
) then
7616 -- Loop through PPC pragmas from spec. Note that preconditions from
7617 -- the body will be analyzed and converted when we scan the body
7618 -- declarations below.
7620 Prag
:= Spec_PPC_List
(Spec_Id
);
7621 while Present
(Prag
) loop
7622 if Pragma_Name
(Prag
) = Name_Precondition
7623 and then PPC_Enabled
(Prag
)
7625 -- Add pragma Check at the start of the declarations of N.
7626 -- Note that this processing reverses the order of the list,
7627 -- which is what we want since new entries were chained to
7628 -- the head of the list.
7630 Prepend
(Grab_PPC
(Name_Precondition
), Declarations
(N
));
7633 Prag
:= Next_Pragma
(Prag
);
7637 -- Build postconditions procedure if needed and prepend the following
7638 -- declaration to the start of the declarations for the subprogram.
7640 -- procedure _postconditions [(_Result : resulttype)] is
7642 -- pragma Check (Postcondition, condition [,message]);
7643 -- pragma Check (Postcondition, condition [,message]);
7647 -- First we deal with the postconditions in the body
7649 if Is_Non_Empty_List
(Declarations
(N
)) then
7651 -- Loop through declarations
7653 Prag
:= First
(Declarations
(N
));
7654 while Present
(Prag
) loop
7655 if Nkind
(Prag
) = N_Pragma
then
7657 -- If pragma, capture if enabled postcondition, else ignore
7659 if Pragma_Name
(Prag
) = Name_Postcondition
7660 and then Check_Enabled
(Name_Postcondition
)
7662 if Plist
= No_List
then
7663 Plist
:= Empty_List
;
7667 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7672 -- Not a pragma, if comes from source, then end scan
7674 elsif Comes_From_Source
(Prag
) then
7677 -- Skip stuff not coming from source
7685 -- Now deal with any postconditions from the spec
7687 if Present
(Spec_Id
) then
7689 -- Loop through PPC pragmas from spec
7691 Prag
:= Spec_PPC_List
(Spec_Id
);
7692 while Present
(Prag
) loop
7693 if Pragma_Name
(Prag
) = Name_Postcondition
7694 and then PPC_Enabled
(Prag
)
7696 if Plist
= No_List
then
7697 Plist
:= Empty_List
;
7700 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7703 Prag
:= Next_Pragma
(Prag
);
7707 -- If we had any postconditions, build the procedure
7709 if Present
(Plist
) then
7710 Subp
:= Defining_Entity
(N
);
7712 if Etype
(Subp
) /= Standard_Void_Type
then
7714 Make_Parameter_Specification
(Loc
,
7715 Defining_Identifier
=>
7716 Make_Defining_Identifier
(Loc
,
7717 Chars
=> Name_uResult
),
7718 Parameter_Type
=> New_Occurrence_Of
(Etype
(Subp
), Loc
)));
7723 Prepend_To
(Declarations
(N
),
7724 Make_Subprogram_Body
(Loc
,
7726 Make_Procedure_Specification
(Loc
,
7727 Defining_Unit_Name
=>
7728 Make_Defining_Identifier
(Loc
,
7729 Chars
=> Name_uPostconditions
),
7730 Parameter_Specifications
=> Parms
),
7732 Declarations
=> Empty_List
,
7734 Handled_Statement_Sequence
=>
7735 Make_Handled_Sequence_Of_Statements
(Loc
,
7736 Statements
=> Plist
)));
7738 if Present
(Spec_Id
) then
7739 Set_Has_Postconditions
(Spec_Id
);
7741 Set_Has_Postconditions
(Body_Id
);
7746 ----------------------------
7747 -- Reference_Body_Formals --
7748 ----------------------------
7750 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
7755 if Error_Posted
(Spec
) then
7759 -- Iterate over both lists. They may be of different lengths if the two
7760 -- specs are not conformant.
7762 Fs
:= First_Formal
(Spec
);
7763 Fb
:= First_Formal
(Bod
);
7764 while Present
(Fs
) and then Present
(Fb
) loop
7765 Generate_Reference
(Fs
, Fb
, 'b');
7768 Style
.Check_Identifier
(Fb
, Fs
);
7771 Set_Spec_Entity
(Fb
, Fs
);
7772 Set_Referenced
(Fs
, False);
7776 end Reference_Body_Formals
;
7778 -------------------------
7779 -- Set_Actual_Subtypes --
7780 -------------------------
7782 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
7783 Loc
: constant Source_Ptr
:= Sloc
(N
);
7787 First_Stmt
: Node_Id
:= Empty
;
7788 AS_Needed
: Boolean;
7791 -- If this is an empty initialization procedure, no need to create
7792 -- actual subtypes (small optimization).
7794 if Ekind
(Subp
) = E_Procedure
7795 and then Is_Null_Init_Proc
(Subp
)
7800 Formal
:= First_Formal
(Subp
);
7801 while Present
(Formal
) loop
7802 T
:= Etype
(Formal
);
7804 -- We never need an actual subtype for a constrained formal
7806 if Is_Constrained
(T
) then
7809 -- If we have unknown discriminants, then we do not need an actual
7810 -- subtype, or more accurately we cannot figure it out! Note that
7811 -- all class-wide types have unknown discriminants.
7813 elsif Has_Unknown_Discriminants
(T
) then
7816 -- At this stage we have an unconstrained type that may need an
7817 -- actual subtype. For sure the actual subtype is needed if we have
7818 -- an unconstrained array type.
7820 elsif Is_Array_Type
(T
) then
7823 -- The only other case needing an actual subtype is an unconstrained
7824 -- record type which is an IN parameter (we cannot generate actual
7825 -- subtypes for the OUT or IN OUT case, since an assignment can
7826 -- change the discriminant values. However we exclude the case of
7827 -- initialization procedures, since discriminants are handled very
7828 -- specially in this context, see the section entitled "Handling of
7829 -- Discriminants" in Einfo.
7831 -- We also exclude the case of Discrim_SO_Functions (functions used
7832 -- in front end layout mode for size/offset values), since in such
7833 -- functions only discriminants are referenced, and not only are such
7834 -- subtypes not needed, but they cannot always be generated, because
7835 -- of order of elaboration issues.
7837 elsif Is_Record_Type
(T
)
7838 and then Ekind
(Formal
) = E_In_Parameter
7839 and then Chars
(Formal
) /= Name_uInit
7840 and then not Is_Unchecked_Union
(T
)
7841 and then not Is_Discrim_SO_Function
(Subp
)
7845 -- All other cases do not need an actual subtype
7851 -- Generate actual subtypes for unconstrained arrays and
7852 -- unconstrained discriminated records.
7855 if Nkind
(N
) = N_Accept_Statement
then
7857 -- If expansion is active, The formal is replaced by a local
7858 -- variable that renames the corresponding entry of the
7859 -- parameter block, and it is this local variable that may
7860 -- require an actual subtype.
7862 if Expander_Active
then
7863 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
7865 Decl
:= Build_Actual_Subtype
(T
, Formal
);
7868 if Present
(Handled_Statement_Sequence
(N
)) then
7870 First
(Statements
(Handled_Statement_Sequence
(N
)));
7871 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
7872 Mark_Rewrite_Insertion
(Decl
);
7874 -- If the accept statement has no body, there will be no
7875 -- reference to the actuals, so no need to compute actual
7882 Decl
:= Build_Actual_Subtype
(T
, Formal
);
7883 Prepend
(Decl
, Declarations
(N
));
7884 Mark_Rewrite_Insertion
(Decl
);
7887 -- The declaration uses the bounds of an existing object, and
7888 -- therefore needs no constraint checks.
7890 Analyze
(Decl
, Suppress
=> All_Checks
);
7892 -- We need to freeze manually the generated type when it is
7893 -- inserted anywhere else than in a declarative part.
7895 if Present
(First_Stmt
) then
7896 Insert_List_Before_And_Analyze
(First_Stmt
,
7897 Freeze_Entity
(Defining_Identifier
(Decl
), Loc
));
7900 if Nkind
(N
) = N_Accept_Statement
7901 and then Expander_Active
7903 Set_Actual_Subtype
(Renamed_Object
(Formal
),
7904 Defining_Identifier
(Decl
));
7906 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
7910 Next_Formal
(Formal
);
7912 end Set_Actual_Subtypes
;
7914 ---------------------
7915 -- Set_Formal_Mode --
7916 ---------------------
7918 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
7919 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
7922 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
7923 -- since we ensure that corresponding actuals are always valid at the
7924 -- point of the call.
7926 if Out_Present
(Spec
) then
7927 if Ekind
(Scope
(Formal_Id
)) = E_Function
7928 or else Ekind
(Scope
(Formal_Id
)) = E_Generic_Function
7930 Error_Msg_N
("functions can only have IN parameters", Spec
);
7931 Set_Ekind
(Formal_Id
, E_In_Parameter
);
7933 elsif In_Present
(Spec
) then
7934 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
7937 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
7938 Set_Never_Set_In_Source
(Formal_Id
, True);
7939 Set_Is_True_Constant
(Formal_Id
, False);
7940 Set_Current_Value
(Formal_Id
, Empty
);
7944 Set_Ekind
(Formal_Id
, E_In_Parameter
);
7947 -- Set Is_Known_Non_Null for access parameters since the language
7948 -- guarantees that access parameters are always non-null. We also set
7949 -- Can_Never_Be_Null, since there is no way to change the value.
7951 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
7953 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
7954 -- null; In Ada 2005, only if then null_exclusion is explicit.
7956 if Ada_Version
< Ada_05
7957 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
7959 Set_Is_Known_Non_Null
(Formal_Id
);
7960 Set_Can_Never_Be_Null
(Formal_Id
);
7963 -- Ada 2005 (AI-231): Null-exclusion access subtype
7965 elsif Is_Access_Type
(Etype
(Formal_Id
))
7966 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
7968 Set_Is_Known_Non_Null
(Formal_Id
);
7971 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
7972 Set_Formal_Validity
(Formal_Id
);
7973 end Set_Formal_Mode
;
7975 -------------------------
7976 -- Set_Formal_Validity --
7977 -------------------------
7979 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
7981 -- If no validity checking, then we cannot assume anything about the
7982 -- validity of parameters, since we do not know there is any checking
7983 -- of the validity on the call side.
7985 if not Validity_Checks_On
then
7988 -- If validity checking for parameters is enabled, this means we are
7989 -- not supposed to make any assumptions about argument values.
7991 elsif Validity_Check_Parameters
then
7994 -- If we are checking in parameters, we will assume that the caller is
7995 -- also checking parameters, so we can assume the parameter is valid.
7997 elsif Ekind
(Formal_Id
) = E_In_Parameter
7998 and then Validity_Check_In_Params
8000 Set_Is_Known_Valid
(Formal_Id
, True);
8002 -- Similar treatment for IN OUT parameters
8004 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
8005 and then Validity_Check_In_Out_Params
8007 Set_Is_Known_Valid
(Formal_Id
, True);
8009 end Set_Formal_Validity
;
8011 ------------------------
8012 -- Subtype_Conformant --
8013 ------------------------
8015 function Subtype_Conformant
8016 (New_Id
: Entity_Id
;
8018 Skip_Controlling_Formals
: Boolean := False) return Boolean
8022 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
8023 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8025 end Subtype_Conformant
;
8027 ---------------------
8028 -- Type_Conformant --
8029 ---------------------
8031 function Type_Conformant
8032 (New_Id
: Entity_Id
;
8034 Skip_Controlling_Formals
: Boolean := False) return Boolean
8038 May_Hide_Profile
:= False;
8041 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
8042 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8044 end Type_Conformant
;
8046 -------------------------------
8047 -- Valid_Operator_Definition --
8048 -------------------------------
8050 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
8053 Id
: constant Name_Id
:= Chars
(Designator
);
8057 F
:= First_Formal
(Designator
);
8058 while Present
(F
) loop
8061 if Present
(Default_Value
(F
)) then
8063 ("default values not allowed for operator parameters",
8070 -- Verify that user-defined operators have proper number of arguments
8071 -- First case of operators which can only be unary
8074 or else Id
= Name_Op_Abs
8078 -- Case of operators which can be unary or binary
8080 elsif Id
= Name_Op_Add
8081 or Id
= Name_Op_Subtract
8083 N_OK
:= (N
in 1 .. 2);
8085 -- All other operators can only be binary
8093 ("incorrect number of arguments for operator", Designator
);
8097 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
8098 and then not Is_Intrinsic_Subprogram
(Designator
)
8101 ("explicit definition of inequality not allowed", Designator
);
8103 end Valid_Operator_Definition
;