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:
545 -- if this is an access to subprogram the signatures must match.
547 if R_Type_Is_Anon_Access
then
548 if R_Stm_Type_Is_Anon_Access
then
550 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
552 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
553 Base_Type
(Designated_Type
(R_Type
))
554 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
557 ("subtype must statically match function result subtype",
558 Subtype_Mark
(Subtype_Ind
));
562 -- For two anonymous access to subprogram types, the
563 -- types themselves must be type conformant.
565 if not Conforming_Types
566 (R_Stm_Type
, R_Type
, Fully_Conformant
)
569 ("subtype must statically match function result subtype",
575 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
578 -- Subtype_indication case; check that the types are the same, and
579 -- statically match if appropriate. A null exclusion may be present
580 -- on the return type, on the function specification, on the object
581 -- declaration or on the subtype itself.
583 elsif Base_Type
(R_Stm_Type
) = Base_Type
(R_Type
) then
584 if Is_Access_Type
(R_Type
)
586 (Can_Never_Be_Null
(R_Type
)
587 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
588 Can_Never_Be_Null
(R_Stm_Type
)
591 ("subtype must statically match function result subtype",
595 if Is_Constrained
(R_Type
) then
596 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
598 ("subtype must statically match function result subtype",
603 -- If the function's result type doesn't match the return object
604 -- entity's type, then we check for the case where the result type
605 -- is class-wide, and allow the declaration if the type of the object
606 -- definition matches the class-wide type. This prevents rejection
607 -- in the case where the object declaration is initialized by a call
608 -- to a build-in-place function with a specific result type and the
609 -- object entity had its type changed to that specific type. This is
610 -- also allowed in the case where Obj_Decl does not come from source,
611 -- which can occur for an expansion of a simple return statement of
612 -- a build-in-place class-wide function when the result expression
613 -- has a specific type, because a return object with a specific type
614 -- is created. (Note that the ARG believes that return objects should
615 -- be allowed to have a type covered by a class-wide result type in
616 -- any case, so once that relaxation is made (see AI05-32), the above
617 -- check for type compatibility should be changed to test Covers
618 -- rather than equality, and the following special test will no
619 -- longer be needed. ???)
621 elsif Is_Class_Wide_Type
(R_Type
)
623 (R_Type
= Etype
(Object_Definition
(Original_Node
(Obj_Decl
)))
624 or else not Comes_From_Source
(Obj_Decl
))
630 ("wrong type for return_subtype_indication", Subtype_Ind
);
632 end Check_Return_Subtype_Indication
;
634 ---------------------
635 -- Local Variables --
636 ---------------------
640 -- Start of processing for Analyze_Function_Return
643 Set_Return_Present
(Scope_Id
);
645 if Nkind
(N
) = N_Simple_Return_Statement
then
646 Expr
:= Expression
(N
);
647 Analyze_And_Resolve
(Expr
, R_Type
);
648 Check_Limited_Return
(Expr
);
651 -- Analyze parts specific to extended_return_statement:
654 Obj_Decl
: constant Node_Id
:=
655 Last
(Return_Object_Declarations
(N
));
657 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
660 Expr
:= Expression
(Obj_Decl
);
662 -- Note: The check for OK_For_Limited_Init will happen in
663 -- Analyze_Object_Declaration; we treat it as a normal
664 -- object declaration.
666 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
669 Check_Return_Subtype_Indication
(Obj_Decl
);
671 if Present
(HSS
) then
674 if Present
(Exception_Handlers
(HSS
)) then
676 -- ???Has_Nested_Block_With_Handler needs to be set.
677 -- Probably by creating an actual N_Block_Statement.
678 -- Probably in Expand.
684 Check_References
(Stm_Entity
);
688 -- Case of Expr present
692 -- Defend against previous errors
694 and then Nkind
(Expr
) /= N_Empty
695 and then Present
(Etype
(Expr
))
697 -- Apply constraint check. Note that this is done before the implicit
698 -- conversion of the expression done for anonymous access types to
699 -- ensure correct generation of the null-excluding check associated
700 -- with null-excluding expressions found in return statements.
702 Apply_Constraint_Check
(Expr
, R_Type
);
704 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
705 -- type, apply an implicit conversion of the expression to that type
706 -- to force appropriate static and run-time accessibility checks.
708 if Ada_Version
>= Ada_05
709 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
711 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
712 Analyze_And_Resolve
(Expr
, R_Type
);
715 -- If the result type is class-wide, then check that the return
716 -- expression's type is not declared at a deeper level than the
717 -- function (RM05-6.5(5.6/2)).
719 if Ada_Version
>= Ada_05
720 and then Is_Class_Wide_Type
(R_Type
)
722 if Type_Access_Level
(Etype
(Expr
)) >
723 Subprogram_Access_Level
(Scope_Id
)
726 ("level of return expression type is deeper than " &
727 "class-wide function!", Expr
);
731 if (Is_Class_Wide_Type
(Etype
(Expr
))
732 or else Is_Dynamically_Tagged
(Expr
))
733 and then not Is_Class_Wide_Type
(R_Type
)
736 ("dynamically tagged expression not allowed!", Expr
);
739 -- ??? A real run-time accessibility check is needed in cases
740 -- involving dereferences of access parameters. For now we just
741 -- check the static cases.
743 if (Ada_Version
< Ada_05
or else Debug_Flag_Dot_L
)
744 and then Is_Inherently_Limited_Type
(Etype
(Scope_Id
))
745 and then Object_Access_Level
(Expr
) >
746 Subprogram_Access_Level
(Scope_Id
)
749 Make_Raise_Program_Error
(Loc
,
750 Reason
=> PE_Accessibility_Check_Failed
));
754 ("cannot return a local value by reference?", N
);
756 ("\& will be raised at run time?",
757 N
, Standard_Program_Error
);
761 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
762 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
764 Apply_Compile_Time_Constraint_Error
766 Msg
=> "(Ada 2005) null not allowed for "
767 & "null-excluding return?",
768 Reason
=> CE_Null_Not_Allowed
);
771 end Analyze_Function_Return
;
773 -------------------------------------
774 -- Analyze_Generic_Subprogram_Body --
775 -------------------------------------
777 procedure Analyze_Generic_Subprogram_Body
781 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
782 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
788 -- Copy body and disable expansion while analyzing the generic For a
789 -- stub, do not copy the stub (which would load the proper body), this
790 -- will be done when the proper body is analyzed.
792 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
793 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
798 Spec
:= Specification
(N
);
800 -- Within the body of the generic, the subprogram is callable, and
801 -- behaves like the corresponding non-generic unit.
803 Body_Id
:= Defining_Entity
(Spec
);
805 if Kind
= E_Generic_Procedure
806 and then Nkind
(Spec
) /= N_Procedure_Specification
808 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
811 elsif Kind
= E_Generic_Function
812 and then Nkind
(Spec
) /= N_Function_Specification
814 Error_Msg_N
("invalid body for generic function ", Body_Id
);
818 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
820 if Has_Completion
(Gen_Id
)
821 and then Nkind
(Parent
(N
)) /= N_Subunit
823 Error_Msg_N
("duplicate generic body", N
);
826 Set_Has_Completion
(Gen_Id
);
829 if Nkind
(N
) = N_Subprogram_Body_Stub
then
830 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
832 Set_Corresponding_Spec
(N
, Gen_Id
);
835 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
836 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
839 -- Make generic parameters immediately visible in the body. They are
840 -- needed to process the formals declarations. Then make the formals
841 -- visible in a separate step.
847 First_Ent
: Entity_Id
;
850 First_Ent
:= First_Entity
(Gen_Id
);
853 while Present
(E
) and then not Is_Formal
(E
) loop
858 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
860 -- Now generic formals are visible, and the specification can be
861 -- analyzed, for subsequent conformance check.
863 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
865 -- Make formal parameters visible
869 -- E is the first formal parameter, we loop through the formals
870 -- installing them so that they will be visible.
872 Set_First_Entity
(Gen_Id
, E
);
873 while Present
(E
) loop
879 -- Visible generic entity is callable within its own body
881 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
882 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
883 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
884 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
885 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
886 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
888 if Nkind
(N
) = N_Subprogram_Body_Stub
then
890 -- No body to analyze, so restore state of generic unit
892 Set_Ekind
(Gen_Id
, Kind
);
893 Set_Ekind
(Body_Id
, Kind
);
895 if Present
(First_Ent
) then
896 Set_First_Entity
(Gen_Id
, First_Ent
);
903 -- If this is a compilation unit, it must be made visible explicitly,
904 -- because the compilation of the declaration, unlike other library
905 -- unit declarations, does not. If it is not a unit, the following
906 -- is redundant but harmless.
908 Set_Is_Immediately_Visible
(Gen_Id
);
909 Reference_Body_Formals
(Gen_Id
, Body_Id
);
911 if Is_Child_Unit
(Gen_Id
) then
912 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
915 Set_Actual_Subtypes
(N
, Current_Scope
);
916 Process_PPCs
(N
, Gen_Id
, Body_Id
);
918 -- If the generic unit carries pre- or post-conditions, copy them
919 -- to the original generic tree, so that they are properly added
920 -- to any instantiation.
923 Orig
: constant Node_Id
:= Original_Node
(N
);
927 Cond
:= First
(Declarations
(N
));
928 while Present
(Cond
) loop
929 if Nkind
(Cond
) = N_Pragma
930 and then Pragma_Name
(Cond
) = Name_Check
932 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
934 elsif Nkind
(Cond
) = N_Pragma
935 and then Pragma_Name
(Cond
) = Name_Postcondition
937 Set_Ekind
(Defining_Entity
(Orig
), Ekind
(Gen_Id
));
938 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
947 Analyze_Declarations
(Declarations
(N
));
949 Analyze
(Handled_Statement_Sequence
(N
));
951 Save_Global_References
(Original_Node
(N
));
953 -- Prior to exiting the scope, include generic formals again (if any
954 -- are present) in the set of local entities.
956 if Present
(First_Ent
) then
957 Set_First_Entity
(Gen_Id
, First_Ent
);
960 Check_References
(Gen_Id
);
963 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
965 Check_Subprogram_Order
(N
);
967 -- Outside of its body, unit is generic again
969 Set_Ekind
(Gen_Id
, Kind
);
970 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
973 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
976 end Analyze_Generic_Subprogram_Body
;
978 -----------------------------
979 -- Analyze_Operator_Symbol --
980 -----------------------------
982 -- An operator symbol such as "+" or "and" may appear in context where the
983 -- literal denotes an entity name, such as "+"(x, y) or in context when it
984 -- is just a string, as in (conjunction = "or"). In these cases the parser
985 -- generates this node, and the semantics does the disambiguation. Other
986 -- such case are actuals in an instantiation, the generic unit in an
987 -- instantiation, and pragma arguments.
989 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
990 Par
: constant Node_Id
:= Parent
(N
);
993 if (Nkind
(Par
) = N_Function_Call
994 and then N
= Name
(Par
))
995 or else Nkind
(Par
) = N_Function_Instantiation
996 or else (Nkind
(Par
) = N_Indexed_Component
997 and then N
= Prefix
(Par
))
998 or else (Nkind
(Par
) = N_Pragma_Argument_Association
999 and then not Is_Pragma_String_Literal
(Par
))
1000 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1001 or else (Nkind
(Par
) = N_Attribute_Reference
1002 and then Attribute_Name
(Par
) /= Name_Value
)
1004 Find_Direct_Name
(N
);
1007 Change_Operator_Symbol_To_String_Literal
(N
);
1010 end Analyze_Operator_Symbol
;
1012 -----------------------------------
1013 -- Analyze_Parameter_Association --
1014 -----------------------------------
1016 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1018 Analyze
(Explicit_Actual_Parameter
(N
));
1019 end Analyze_Parameter_Association
;
1021 ----------------------------
1022 -- Analyze_Procedure_Call --
1023 ----------------------------
1025 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1026 Loc
: constant Source_Ptr
:= Sloc
(N
);
1027 P
: constant Node_Id
:= Name
(N
);
1028 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1032 procedure Analyze_Call_And_Resolve
;
1033 -- Do Analyze and Resolve calls for procedure call
1035 ------------------------------
1036 -- Analyze_Call_And_Resolve --
1037 ------------------------------
1039 procedure Analyze_Call_And_Resolve
is
1041 if Nkind
(N
) = N_Procedure_Call_Statement
then
1043 Resolve
(N
, Standard_Void_Type
);
1047 end Analyze_Call_And_Resolve
;
1049 -- Start of processing for Analyze_Procedure_Call
1052 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1053 -- a procedure call or an entry call. The prefix may denote an access
1054 -- to subprogram type, in which case an implicit dereference applies.
1055 -- If the prefix is an indexed component (without implicit dereference)
1056 -- then the construct denotes a call to a member of an entire family.
1057 -- If the prefix is a simple name, it may still denote a call to a
1058 -- parameterless member of an entry family. Resolution of these various
1059 -- interpretations is delicate.
1063 -- If this is a call of the form Obj.Op, the call may have been
1064 -- analyzed and possibly rewritten into a block, in which case
1067 if Analyzed
(N
) then
1071 -- If error analyzing prefix, then set Any_Type as result and return
1073 if Etype
(P
) = Any_Type
then
1074 Set_Etype
(N
, Any_Type
);
1078 -- Otherwise analyze the parameters
1080 if Present
(Actuals
) then
1081 Actual
:= First
(Actuals
);
1083 while Present
(Actual
) loop
1085 Check_Parameterless_Call
(Actual
);
1090 -- Special processing for Elab_Spec and Elab_Body calls
1092 if Nkind
(P
) = N_Attribute_Reference
1093 and then (Attribute_Name
(P
) = Name_Elab_Spec
1094 or else Attribute_Name
(P
) = Name_Elab_Body
)
1096 if Present
(Actuals
) then
1098 ("no parameters allowed for this call", First
(Actuals
));
1102 Set_Etype
(N
, Standard_Void_Type
);
1105 elsif Is_Entity_Name
(P
)
1106 and then Is_Record_Type
(Etype
(Entity
(P
)))
1107 and then Remote_AST_I_Dereference
(P
)
1111 elsif Is_Entity_Name
(P
)
1112 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1114 if Is_Access_Type
(Etype
(P
))
1115 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1116 and then No
(Actuals
)
1117 and then Comes_From_Source
(N
)
1119 Error_Msg_N
("missing explicit dereference in call", N
);
1122 Analyze_Call_And_Resolve
;
1124 -- If the prefix is the simple name of an entry family, this is
1125 -- a parameterless call from within the task body itself.
1127 elsif Is_Entity_Name
(P
)
1128 and then Nkind
(P
) = N_Identifier
1129 and then Ekind
(Entity
(P
)) = E_Entry_Family
1130 and then Present
(Actuals
)
1131 and then No
(Next
(First
(Actuals
)))
1133 -- Can be call to parameterless entry family. What appears to be the
1134 -- sole argument is in fact the entry index. Rewrite prefix of node
1135 -- accordingly. Source representation is unchanged by this
1139 Make_Indexed_Component
(Loc
,
1141 Make_Selected_Component
(Loc
,
1142 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1143 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1144 Expressions
=> Actuals
);
1145 Set_Name
(N
, New_N
);
1146 Set_Etype
(New_N
, Standard_Void_Type
);
1147 Set_Parameter_Associations
(N
, No_List
);
1148 Analyze_Call_And_Resolve
;
1150 elsif Nkind
(P
) = N_Explicit_Dereference
then
1151 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1152 Analyze_Call_And_Resolve
;
1154 Error_Msg_N
("expect access to procedure in call", P
);
1157 -- The name can be a selected component or an indexed component that
1158 -- yields an access to subprogram. Such a prefix is legal if the call
1159 -- has parameter associations.
1161 elsif Is_Access_Type
(Etype
(P
))
1162 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1164 if Present
(Actuals
) then
1165 Analyze_Call_And_Resolve
;
1167 Error_Msg_N
("missing explicit dereference in call ", N
);
1170 -- If not an access to subprogram, then the prefix must resolve to the
1171 -- name of an entry, entry family, or protected operation.
1173 -- For the case of a simple entry call, P is a selected component where
1174 -- the prefix is the task and the selector name is the entry. A call to
1175 -- a protected procedure will have the same syntax. If the protected
1176 -- object contains overloaded operations, the entity may appear as a
1177 -- function, the context will select the operation whose type is Void.
1179 elsif Nkind
(P
) = N_Selected_Component
1180 and then (Ekind
(Entity
(Selector_Name
(P
))) = E_Entry
1182 Ekind
(Entity
(Selector_Name
(P
))) = E_Procedure
1184 Ekind
(Entity
(Selector_Name
(P
))) = E_Function
)
1186 Analyze_Call_And_Resolve
;
1188 elsif Nkind
(P
) = N_Selected_Component
1189 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1190 and then Present
(Actuals
)
1191 and then No
(Next
(First
(Actuals
)))
1193 -- Can be call to parameterless entry family. What appears to be the
1194 -- sole argument is in fact the entry index. Rewrite prefix of node
1195 -- accordingly. Source representation is unchanged by this
1199 Make_Indexed_Component
(Loc
,
1200 Prefix
=> New_Copy
(P
),
1201 Expressions
=> Actuals
);
1202 Set_Name
(N
, New_N
);
1203 Set_Etype
(New_N
, Standard_Void_Type
);
1204 Set_Parameter_Associations
(N
, No_List
);
1205 Analyze_Call_And_Resolve
;
1207 -- For the case of a reference to an element of an entry family, P is
1208 -- an indexed component whose prefix is a selected component (task and
1209 -- entry family), and whose index is the entry family index.
1211 elsif Nkind
(P
) = N_Indexed_Component
1212 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1213 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1215 Analyze_Call_And_Resolve
;
1217 -- If the prefix is the name of an entry family, it is a call from
1218 -- within the task body itself.
1220 elsif Nkind
(P
) = N_Indexed_Component
1221 and then Nkind
(Prefix
(P
)) = N_Identifier
1222 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1225 Make_Selected_Component
(Loc
,
1226 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1227 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1228 Rewrite
(Prefix
(P
), New_N
);
1230 Analyze_Call_And_Resolve
;
1232 -- Anything else is an error
1235 Error_Msg_N
("invalid procedure or entry call", N
);
1237 end Analyze_Procedure_Call
;
1239 -------------------------------------
1240 -- Analyze_Simple_Return_Statement --
1241 -------------------------------------
1243 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1245 if Present
(Expression
(N
)) then
1246 Mark_Coextensions
(N
, Expression
(N
));
1249 Analyze_Return_Statement
(N
);
1250 end Analyze_Simple_Return_Statement
;
1252 -------------------------
1253 -- Analyze_Return_Type --
1254 -------------------------
1256 procedure Analyze_Return_Type
(N
: Node_Id
) is
1257 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1258 Typ
: Entity_Id
:= Empty
;
1261 -- Normal case where result definition does not indicate an error
1263 if Result_Definition
(N
) /= Error
then
1264 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1266 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1269 AD
: constant Node_Id
:=
1270 Access_To_Subprogram_Definition
(Result_Definition
(N
));
1272 if Present
(AD
) and then Protected_Present
(AD
) then
1273 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
1275 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1279 Set_Parent
(Typ
, Result_Definition
(N
));
1280 Set_Is_Local_Anonymous_Access
(Typ
);
1281 Set_Etype
(Designator
, Typ
);
1283 -- Subtype_Mark case
1286 Find_Type
(Result_Definition
(N
));
1287 Typ
:= Entity
(Result_Definition
(N
));
1288 Set_Etype
(Designator
, Typ
);
1290 if Ekind
(Typ
) = E_Incomplete_Type
1291 and then Is_Value_Type
(Typ
)
1295 elsif Ekind
(Typ
) = E_Incomplete_Type
1296 or else (Is_Class_Wide_Type
(Typ
)
1298 Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
1301 ("invalid use of incomplete type", Result_Definition
(N
));
1305 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1307 Null_Exclusion_Static_Checks
(N
);
1309 -- Case where result definition does indicate an error
1312 Set_Etype
(Designator
, Any_Type
);
1314 end Analyze_Return_Type
;
1316 -----------------------------
1317 -- Analyze_Subprogram_Body --
1318 -----------------------------
1320 -- This procedure is called for regular subprogram bodies, generic bodies,
1321 -- and for subprogram stubs of both kinds. In the case of stubs, only the
1322 -- specification matters, and is used to create a proper declaration for
1323 -- the subprogram, or to perform conformance checks.
1325 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
1326 Loc
: constant Source_Ptr
:= Sloc
(N
);
1327 Body_Deleted
: constant Boolean := False;
1328 Body_Spec
: constant Node_Id
:= Specification
(N
);
1329 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
1330 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
1331 Conformant
: Boolean;
1333 Missing_Ret
: Boolean;
1335 Prot_Typ
: Entity_Id
:= Empty
;
1336 Spec_Id
: Entity_Id
;
1337 Spec_Decl
: Node_Id
:= Empty
;
1339 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
1340 -- When we analyze a separate spec, the entity chain ends up containing
1341 -- the formals, as well as any itypes generated during analysis of the
1342 -- default expressions for parameters, or the arguments of associated
1343 -- precondition/postcondition pragmas (which are analyzed in the context
1344 -- of the spec since they have visibility on formals).
1346 -- These entities belong with the spec and not the body. However we do
1347 -- the analysis of the body in the context of the spec (again to obtain
1348 -- visibility to the formals), and all the entities generated during
1349 -- this analysis end up also chained to the entity chain of the spec.
1350 -- But they really belong to the body, and there is circuitry to move
1351 -- them from the spec to the body.
1353 -- However, when we do this move, we don't want to move the real spec
1354 -- entities (first para above) to the body. The Last_Real_Spec_Entity
1355 -- variable points to the last real spec entity, so we only move those
1356 -- chained beyond that point. It is initialized to Empty to deal with
1357 -- the case where there is no separate spec.
1359 procedure Check_Anonymous_Return
;
1360 -- (Ada 2005): if a function returns an access type that denotes a task,
1361 -- or a type that contains tasks, we must create a master entity for
1362 -- the anonymous type, which typically will be used in an allocator
1363 -- in the body of the function.
1365 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
1366 -- Look ahead to recognize a pragma that may appear after the body.
1367 -- If there is a previous spec, check that it appears in the same
1368 -- declarative part. If the pragma is Inline_Always, perform inlining
1369 -- unconditionally, otherwise only if Front_End_Inlining is requested.
1370 -- If the body acts as a spec, and inlining is required, we create a
1371 -- subprogram declaration for it, in order to attach the body to inline.
1372 -- If pragma does not appear after the body, check whether there is
1373 -- an inline pragma before any local declarations.
1375 function Disambiguate_Spec
return Entity_Id
;
1376 -- When a primitive is declared between the private view and the full
1377 -- view of a concurrent type which implements an interface, a special
1378 -- mechanism is used to find the corresponding spec of the primitive
1381 function Is_Private_Concurrent_Primitive
1382 (Subp_Id
: Entity_Id
) return Boolean;
1383 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
1384 -- type that implements an interface and has a private view.
1386 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
1387 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
1388 -- subprogram whose body is being analyzed. N is the statement node
1389 -- causing the flag to be set, if the following statement is a return
1390 -- of an entity, we mark the entity as set in source to suppress any
1391 -- warning on the stylized use of function stubs with a dummy return.
1393 procedure Verify_Overriding_Indicator
;
1394 -- If there was a previous spec, the entity has been entered in the
1395 -- current scope previously. If the body itself carries an overriding
1396 -- indicator, check that it is consistent with the known status of the
1399 ----------------------------
1400 -- Check_Anonymous_Return --
1401 ----------------------------
1403 procedure Check_Anonymous_Return
is
1408 if Present
(Spec_Id
) then
1414 if Ekind
(Scop
) = E_Function
1415 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
1416 and then Has_Task
(Designated_Type
(Etype
(Scop
)))
1417 and then Expander_Active
1420 Make_Object_Declaration
(Loc
,
1421 Defining_Identifier
=>
1422 Make_Defining_Identifier
(Loc
, Name_uMaster
),
1423 Constant_Present
=> True,
1424 Object_Definition
=>
1425 New_Reference_To
(RTE
(RE_Master_Id
), Loc
),
1427 Make_Explicit_Dereference
(Loc
,
1428 New_Reference_To
(RTE
(RE_Current_Master
), Loc
)));
1430 if Present
(Declarations
(N
)) then
1431 Prepend
(Decl
, Declarations
(N
));
1433 Set_Declarations
(N
, New_List
(Decl
));
1436 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
1437 Set_Has_Master_Entity
(Scop
);
1439 end Check_Anonymous_Return
;
1441 -------------------------
1442 -- Check_Inline_Pragma --
1443 -------------------------
1445 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
1449 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
1450 -- True when N is a pragma Inline or Inline_Always that applies
1451 -- to this subprogram.
1453 -----------------------
1454 -- Is_Inline_Pragma --
1455 -----------------------
1457 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
1460 Nkind
(N
) = N_Pragma
1462 (Pragma_Name
(N
) = Name_Inline_Always
1465 and then Pragma_Name
(N
) = Name_Inline
))
1468 (Expression
(First
(Pragma_Argument_Associations
(N
))))
1470 end Is_Inline_Pragma
;
1472 -- Start of processing for Check_Inline_Pragma
1475 if not Expander_Active
then
1479 if Is_List_Member
(N
)
1480 and then Present
(Next
(N
))
1481 and then Is_Inline_Pragma
(Next
(N
))
1485 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
1486 and then Present
(Declarations
(N
))
1487 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
1489 Prag
:= First
(Declarations
(N
));
1495 if Present
(Prag
) then
1496 if Present
(Spec_Id
) then
1497 if List_Containing
(N
) =
1498 List_Containing
(Unit_Declaration_Node
(Spec_Id
))
1504 -- Create a subprogram declaration, to make treatment uniform
1507 Subp
: constant Entity_Id
:=
1508 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
1509 Decl
: constant Node_Id
:=
1510 Make_Subprogram_Declaration
(Loc
,
1511 Specification
=> New_Copy_Tree
(Specification
(N
)));
1513 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
1515 if Present
(First_Formal
(Body_Id
)) then
1516 Plist
:= Copy_Parameter_List
(Body_Id
);
1517 Set_Parameter_Specifications
1518 (Specification
(Decl
), Plist
);
1521 Insert_Before
(N
, Decl
);
1524 Set_Has_Pragma_Inline
(Subp
);
1526 if Pragma_Name
(Prag
) = Name_Inline_Always
then
1527 Set_Is_Inlined
(Subp
);
1528 Set_Has_Pragma_Inline_Always
(Subp
);
1535 end Check_Inline_Pragma
;
1537 -----------------------
1538 -- Disambiguate_Spec --
1539 -----------------------
1541 function Disambiguate_Spec
return Entity_Id
is
1542 Priv_Spec
: Entity_Id
;
1545 procedure Replace_Types
(To_Corresponding
: Boolean);
1546 -- Depending on the flag, replace the type of formal parameters of
1547 -- Body_Id if it is a concurrent type implementing interfaces with
1548 -- the corresponding record type or the other way around.
1550 procedure Replace_Types
(To_Corresponding
: Boolean) is
1552 Formal_Typ
: Entity_Id
;
1555 Formal
:= First_Formal
(Body_Id
);
1556 while Present
(Formal
) loop
1557 Formal_Typ
:= Etype
(Formal
);
1559 -- From concurrent type to corresponding record
1561 if To_Corresponding
then
1562 if Is_Concurrent_Type
(Formal_Typ
)
1563 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
1564 and then Present
(Interfaces
(
1565 Corresponding_Record_Type
(Formal_Typ
)))
1568 Corresponding_Record_Type
(Formal_Typ
));
1571 -- From corresponding record to concurrent type
1574 if Is_Concurrent_Record_Type
(Formal_Typ
)
1575 and then Present
(Interfaces
(Formal_Typ
))
1578 Corresponding_Concurrent_Type
(Formal_Typ
));
1582 Next_Formal
(Formal
);
1586 -- Start of processing for Disambiguate_Spec
1589 -- Try to retrieve the specification of the body as is. All error
1590 -- messages are suppressed because the body may not have a spec in
1591 -- its current state.
1593 Spec_N
:= Find_Corresponding_Spec
(N
, False);
1595 -- It is possible that this is the body of a primitive declared
1596 -- between a private and a full view of a concurrent type. The
1597 -- controlling parameter of the spec carries the concurrent type,
1598 -- not the corresponding record type as transformed by Analyze_
1599 -- Subprogram_Specification. In such cases, we undo the change
1600 -- made by the analysis of the specification and try to find the
1603 -- Note that wrappers already have their corresponding specs and
1604 -- bodies set during their creation, so if the candidate spec is
1605 -- a wrapper, then we definately need to swap all types to their
1606 -- original concurrent status.
1609 or else Is_Primitive_Wrapper
(Spec_N
)
1611 -- Restore all references of corresponding record types to the
1612 -- original concurrent types.
1614 Replace_Types
(To_Corresponding
=> False);
1615 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
1617 -- The current body truly belongs to a primitive declared between
1618 -- a private and a full view. We leave the modified body as is,
1619 -- and return the true spec.
1621 if Present
(Priv_Spec
)
1622 and then Is_Private_Primitive
(Priv_Spec
)
1627 -- In case that this is some sort of error, restore the original
1628 -- state of the body.
1630 Replace_Types
(To_Corresponding
=> True);
1634 end Disambiguate_Spec
;
1636 -------------------------------------
1637 -- Is_Private_Concurrent_Primitive --
1638 -------------------------------------
1640 function Is_Private_Concurrent_Primitive
1641 (Subp_Id
: Entity_Id
) return Boolean
1643 Formal_Typ
: Entity_Id
;
1646 if Present
(First_Formal
(Subp_Id
)) then
1647 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
1649 if Is_Concurrent_Record_Type
(Formal_Typ
) then
1650 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
1653 -- The type of the first formal is a concurrent tagged type with
1657 Is_Concurrent_Type
(Formal_Typ
)
1658 and then Is_Tagged_Type
(Formal_Typ
)
1659 and then Has_Private_Declaration
(Formal_Typ
);
1663 end Is_Private_Concurrent_Primitive
;
1665 ----------------------------
1666 -- Set_Trivial_Subprogram --
1667 ----------------------------
1669 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
1670 Nxt
: constant Node_Id
:= Next
(N
);
1673 Set_Is_Trivial_Subprogram
(Body_Id
);
1675 if Present
(Spec_Id
) then
1676 Set_Is_Trivial_Subprogram
(Spec_Id
);
1680 and then Nkind
(Nxt
) = N_Simple_Return_Statement
1681 and then No
(Next
(Nxt
))
1682 and then Present
(Expression
(Nxt
))
1683 and then Is_Entity_Name
(Expression
(Nxt
))
1685 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
1687 end Set_Trivial_Subprogram
;
1689 ---------------------------------
1690 -- Verify_Overriding_Indicator --
1691 ---------------------------------
1693 procedure Verify_Overriding_Indicator
is
1695 if Must_Override
(Body_Spec
) then
1696 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1697 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1701 elsif not Is_Overriding_Operation
(Spec_Id
) then
1703 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
1706 elsif Must_Not_Override
(Body_Spec
) then
1707 if Is_Overriding_Operation
(Spec_Id
) then
1709 ("subprogram& overrides inherited operation",
1710 Body_Spec
, Spec_Id
);
1712 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1713 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1716 ("subprogram & overrides predefined operator ",
1717 Body_Spec
, Spec_Id
);
1719 -- If this is not a primitive operation the overriding indicator
1720 -- is altogether illegal.
1722 elsif not Is_Primitive
(Spec_Id
) then
1723 Error_Msg_N
("overriding indicator only allowed " &
1724 "if subprogram is primitive",
1728 end Verify_Overriding_Indicator
;
1730 -- Start of processing for Analyze_Subprogram_Body
1733 if Debug_Flag_C
then
1734 Write_Str
("==== Compiling subprogram body ");
1735 Write_Name
(Chars
(Body_Id
));
1736 Write_Str
(" from ");
1737 Write_Location
(Loc
);
1741 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
1743 -- Generic subprograms are handled separately. They always have a
1744 -- generic specification. Determine whether current scope has a
1745 -- previous declaration.
1747 -- If the subprogram body is defined within an instance of the same
1748 -- name, the instance appears as a package renaming, and will be hidden
1749 -- within the subprogram.
1751 if Present
(Prev_Id
)
1752 and then not Is_Overloadable
(Prev_Id
)
1753 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
1754 or else Comes_From_Source
(Prev_Id
))
1756 if Is_Generic_Subprogram
(Prev_Id
) then
1758 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1759 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1761 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
1765 -- Previous entity conflicts with subprogram name. Attempting to
1766 -- enter name will post error.
1768 Enter_Name
(Body_Id
);
1772 -- Non-generic case, find the subprogram declaration, if one was seen,
1773 -- or enter new overloaded entity in the current scope. If the
1774 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
1775 -- part of the context of one of its subunits. No need to redo the
1778 elsif Prev_Id
= Body_Id
1779 and then Has_Completion
(Body_Id
)
1784 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
1786 if Nkind
(N
) = N_Subprogram_Body_Stub
1787 or else No
(Corresponding_Spec
(N
))
1789 if Is_Private_Concurrent_Primitive
(Body_Id
) then
1790 Spec_Id
:= Disambiguate_Spec
;
1792 Spec_Id
:= Find_Corresponding_Spec
(N
);
1795 -- If this is a duplicate body, no point in analyzing it
1797 if Error_Posted
(N
) then
1801 -- A subprogram body should cause freezing of its own declaration,
1802 -- but if there was no previous explicit declaration, then the
1803 -- subprogram will get frozen too late (there may be code within
1804 -- the body that depends on the subprogram having been frozen,
1805 -- such as uses of extra formals), so we force it to be frozen
1806 -- here. Same holds if the body and spec are compilation units.
1807 -- Finally, if the return type is an anonymous access to protected
1808 -- subprogram, it must be frozen before the body because its
1809 -- expansion has generated an equivalent type that is used when
1810 -- elaborating the body.
1812 if No
(Spec_Id
) then
1813 Freeze_Before
(N
, Body_Id
);
1815 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1816 Freeze_Before
(N
, Spec_Id
);
1818 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
1819 Freeze_Before
(N
, Etype
(Body_Id
));
1823 Spec_Id
:= Corresponding_Spec
(N
);
1827 -- Do not inline any subprogram that contains nested subprograms, since
1828 -- the backend inlining circuit seems to generate uninitialized
1829 -- references in this case. We know this happens in the case of front
1830 -- end ZCX support, but it also appears it can happen in other cases as
1831 -- well. The backend often rejects attempts to inline in the case of
1832 -- nested procedures anyway, so little if anything is lost by this.
1833 -- Note that this is test is for the benefit of the back-end. There is
1834 -- a separate test for front-end inlining that also rejects nested
1837 -- Do not do this test if errors have been detected, because in some
1838 -- error cases, this code blows up, and we don't need it anyway if
1839 -- there have been errors, since we won't get to the linker anyway.
1841 if Comes_From_Source
(Body_Id
)
1842 and then Serious_Errors_Detected
= 0
1846 P_Ent
:= Scope
(P_Ent
);
1847 exit when No
(P_Ent
) or else P_Ent
= Standard_Standard
;
1849 if Is_Subprogram
(P_Ent
) then
1850 Set_Is_Inlined
(P_Ent
, False);
1852 if Comes_From_Source
(P_Ent
)
1853 and then Has_Pragma_Inline
(P_Ent
)
1856 ("cannot inline& (nested subprogram)?",
1863 Check_Inline_Pragma
(Spec_Id
);
1865 -- Case of fully private operation in the body of the protected type.
1866 -- We must create a declaration for the subprogram, in order to attach
1867 -- the protected subprogram that will be used in internal calls.
1870 and then Comes_From_Source
(N
)
1871 and then Is_Protected_Type
(Current_Scope
)
1880 Formal
:= First_Formal
(Body_Id
);
1882 -- The protected operation always has at least one formal, namely
1883 -- the object itself, but it is only placed in the parameter list
1884 -- if expansion is enabled.
1887 or else Expander_Active
1889 Plist
:= Copy_Parameter_List
(Body_Id
);
1894 if Nkind
(Body_Spec
) = N_Procedure_Specification
then
1896 Make_Procedure_Specification
(Loc
,
1897 Defining_Unit_Name
=>
1898 Make_Defining_Identifier
(Sloc
(Body_Id
),
1899 Chars
=> Chars
(Body_Id
)),
1900 Parameter_Specifications
=> Plist
);
1903 Make_Function_Specification
(Loc
,
1904 Defining_Unit_Name
=>
1905 Make_Defining_Identifier
(Sloc
(Body_Id
),
1906 Chars
=> Chars
(Body_Id
)),
1907 Parameter_Specifications
=> Plist
,
1908 Result_Definition
=>
1909 New_Occurrence_Of
(Etype
(Body_Id
), Loc
));
1913 Make_Subprogram_Declaration
(Loc
,
1914 Specification
=> New_Spec
);
1915 Insert_Before
(N
, Decl
);
1916 Spec_Id
:= Defining_Unit_Name
(New_Spec
);
1918 -- Indicate that the entity comes from source, to ensure that
1919 -- cross-reference information is properly generated. The body
1920 -- itself is rewritten during expansion, and the body entity will
1921 -- not appear in calls to the operation.
1923 Set_Comes_From_Source
(Spec_Id
, True);
1925 Set_Has_Completion
(Spec_Id
);
1926 Set_Convention
(Spec_Id
, Convention_Protected
);
1929 elsif Present
(Spec_Id
) then
1930 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
1931 Verify_Overriding_Indicator
;
1933 -- In general, the spec will be frozen when we start analyzing the
1934 -- body. However, for internally generated operations, such as
1935 -- wrapper functions for inherited operations with controlling
1936 -- results, the spec may not have been frozen by the time we
1937 -- expand the freeze actions that include the bodies. In particular,
1938 -- extra formals for accessibility or for return-in-place may need
1939 -- to be generated. Freeze nodes, if any, are inserted before the
1942 if not Is_Frozen
(Spec_Id
)
1943 and then Expander_Active
1945 -- Force the generation of its freezing node to ensure proper
1946 -- management of access types in the backend.
1948 -- This is definitely needed for some cases, but it is not clear
1949 -- why, to be investigated further???
1951 Set_Has_Delayed_Freeze
(Spec_Id
);
1952 Insert_Actions
(N
, Freeze_Entity
(Spec_Id
, Loc
));
1956 if Chars
(Body_Id
) = Name_uPostconditions
then
1957 Set_Has_Postconditions
(Current_Scope
);
1960 -- Place subprogram on scope stack, and make formals visible. If there
1961 -- is a spec, the visible entity remains that of the spec.
1963 if Present
(Spec_Id
) then
1964 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
1966 if Is_Child_Unit
(Spec_Id
) then
1967 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
1971 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
1974 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1975 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1977 if Is_Abstract_Subprogram
(Spec_Id
) then
1978 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
1982 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
1983 Set_Has_Completion
(Spec_Id
);
1985 if Is_Protected_Type
(Scope
(Spec_Id
)) then
1986 Prot_Typ
:= Scope
(Spec_Id
);
1989 -- If this is a body generated for a renaming, do not check for
1990 -- full conformance. The check is redundant, because the spec of
1991 -- the body is a copy of the spec in the renaming declaration,
1992 -- and the test can lead to spurious errors on nested defaults.
1994 if Present
(Spec_Decl
)
1995 and then not Comes_From_Source
(N
)
1997 (Nkind
(Original_Node
(Spec_Decl
)) =
1998 N_Subprogram_Renaming_Declaration
1999 or else (Present
(Corresponding_Body
(Spec_Decl
))
2001 Nkind
(Unit_Declaration_Node
2002 (Corresponding_Body
(Spec_Decl
))) =
2003 N_Subprogram_Renaming_Declaration
))
2010 Fully_Conformant
, True, Conformant
, Body_Id
);
2013 -- If the body is not fully conformant, we have to decide if we
2014 -- should analyze it or not. If it has a really messed up profile
2015 -- then we probably should not analyze it, since we will get too
2016 -- many bogus messages.
2018 -- Our decision is to go ahead in the non-fully conformant case
2019 -- only if it is at least mode conformant with the spec. Note
2020 -- that the call to Check_Fully_Conformant has issued the proper
2021 -- error messages to complain about the lack of conformance.
2024 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
2030 if Spec_Id
/= Body_Id
then
2031 Reference_Body_Formals
(Spec_Id
, Body_Id
);
2034 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2035 Set_Corresponding_Spec
(N
, Spec_Id
);
2037 -- Ada 2005 (AI-345): If the operation is a primitive operation
2038 -- of a concurrent type, the type of the first parameter has been
2039 -- replaced with the corresponding record, which is the proper
2040 -- run-time structure to use. However, within the body there may
2041 -- be uses of the formals that depend on primitive operations
2042 -- of the type (in particular calls in prefixed form) for which
2043 -- we need the original concurrent type. The operation may have
2044 -- several controlling formals, so the replacement must be done
2047 if Comes_From_Source
(Spec_Id
)
2048 and then Present
(First_Entity
(Spec_Id
))
2049 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
2050 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
2052 Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
2055 (Corresponding_Concurrent_Type
2056 (Etype
(First_Entity
(Spec_Id
))))
2059 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
2063 Form
:= First_Formal
(Spec_Id
);
2064 while Present
(Form
) loop
2065 if Etype
(Form
) = Typ
then
2066 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
2074 -- Make the formals visible, and place subprogram on scope stack.
2075 -- This is also the point at which we set Last_Real_Spec_Entity
2076 -- to mark the entities which will not be moved to the body.
2078 Install_Formals
(Spec_Id
);
2079 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
2080 Push_Scope
(Spec_Id
);
2082 -- Make sure that the subprogram is immediately visible. For
2083 -- child units that have no separate spec this is indispensable.
2084 -- Otherwise it is safe albeit redundant.
2086 Set_Is_Immediately_Visible
(Spec_Id
);
2089 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
2090 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
2091 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
2092 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
2094 -- Case of subprogram body with no previous spec
2098 and then Comes_From_Source
(Body_Id
)
2099 and then not Suppress_Style_Checks
(Body_Id
)
2100 and then not In_Instance
2102 Style
.Body_With_No_Spec
(N
);
2105 New_Overloaded_Entity
(Body_Id
);
2107 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2108 Set_Acts_As_Spec
(N
);
2109 Generate_Definition
(Body_Id
);
2111 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
2112 Generate_Reference_To_Formals
(Body_Id
);
2113 Install_Formals
(Body_Id
);
2114 Push_Scope
(Body_Id
);
2118 -- If the return type is an anonymous access type whose designated type
2119 -- is the limited view of a class-wide type and the non-limited view is
2120 -- available, update the return type accordingly.
2122 if Ada_Version
>= Ada_05
2123 and then Comes_From_Source
(N
)
2130 Rtyp
:= Etype
(Current_Scope
);
2132 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
2133 Etyp
:= Directly_Designated_Type
(Rtyp
);
2135 if Is_Class_Wide_Type
(Etyp
)
2136 and then From_With_Type
(Etyp
)
2138 Set_Directly_Designated_Type
2139 (Etype
(Current_Scope
), Available_View
(Etyp
));
2145 -- If this is the proper body of a stub, we must verify that the stub
2146 -- conforms to the body, and to the previous spec if one was present.
2147 -- we know already that the body conforms to that spec. This test is
2148 -- only required for subprograms that come from source.
2150 if Nkind
(Parent
(N
)) = N_Subunit
2151 and then Comes_From_Source
(N
)
2152 and then not Error_Posted
(Body_Id
)
2153 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
2154 N_Subprogram_Body_Stub
2157 Old_Id
: constant Entity_Id
:=
2159 (Specification
(Corresponding_Stub
(Parent
(N
))));
2161 Conformant
: Boolean := False;
2164 if No
(Spec_Id
) then
2165 Check_Fully_Conformant
(Body_Id
, Old_Id
);
2169 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
2171 if not Conformant
then
2173 -- The stub was taken to be a new declaration. Indicate
2174 -- that it lacks a body.
2176 Set_Has_Completion
(Old_Id
, False);
2182 Set_Has_Completion
(Body_Id
);
2183 Check_Eliminated
(Body_Id
);
2185 if Nkind
(N
) = N_Subprogram_Body_Stub
then
2188 elsif Present
(Spec_Id
)
2189 and then Expander_Active
2191 (Has_Pragma_Inline_Always
(Spec_Id
)
2192 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
))
2194 Build_Body_To_Inline
(N
, Spec_Id
);
2197 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2198 -- if its specification we have to install the private withed units.
2199 -- This holds for child units as well.
2201 if Is_Compilation_Unit
(Body_Id
)
2202 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
2204 Install_Private_With_Clauses
(Body_Id
);
2207 Check_Anonymous_Return
;
2209 -- Set the Protected_Formal field of each extra formal of the protected
2210 -- subprogram to reference the corresponding extra formal of the
2211 -- subprogram that implements it. For regular formals this occurs when
2212 -- the protected subprogram's declaration is expanded, but the extra
2213 -- formals don't get created until the subprogram is frozen. We need to
2214 -- do this before analyzing the protected subprogram's body so that any
2215 -- references to the original subprogram's extra formals will be changed
2216 -- refer to the implementing subprogram's formals (see Expand_Formal).
2218 if Present
(Spec_Id
)
2219 and then Is_Protected_Type
(Scope
(Spec_Id
))
2220 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
2223 Impl_Subp
: constant Entity_Id
:=
2224 Protected_Body_Subprogram
(Spec_Id
);
2225 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
2226 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
2228 while Present
(Prot_Ext_Formal
) loop
2229 pragma Assert
(Present
(Impl_Ext_Formal
));
2230 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
2231 Next_Formal_With_Extras
(Prot_Ext_Formal
);
2232 Next_Formal_With_Extras
(Impl_Ext_Formal
);
2237 -- Now we can go on to analyze the body
2239 HSS
:= Handled_Statement_Sequence
(N
);
2240 Set_Actual_Subtypes
(N
, Current_Scope
);
2242 -- Deal with preconditions and postconditions
2244 Process_PPCs
(N
, Spec_Id
, Body_Id
);
2246 -- Add a declaration for the Protection object, renaming declarations
2247 -- for discriminals and privals and finally a declaration for the entry
2248 -- family index (if applicable). This form of early expansion is done
2249 -- when the Expander is active because Install_Private_Data_Declarations
2250 -- references entities which were created during regular expansion.
2253 and then Comes_From_Source
(N
)
2254 and then Present
(Prot_Typ
)
2255 and then Present
(Spec_Id
)
2256 and then not Is_Eliminated
(Spec_Id
)
2258 Install_Private_Data_Declarations
2259 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
2262 -- Analyze the declarations (this call will analyze the precondition
2263 -- Check pragmas we prepended to the list, as well as the declaration
2264 -- of the _Postconditions procedure).
2266 Analyze_Declarations
(Declarations
(N
));
2268 -- Check completion, and analyze the statements
2271 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
2274 -- Deal with end of scope processing for the body
2276 Process_End_Label
(HSS
, 't', Current_Scope
);
2278 Check_Subprogram_Order
(N
);
2279 Set_Analyzed
(Body_Id
);
2281 -- If we have a separate spec, then the analysis of the declarations
2282 -- caused the entities in the body to be chained to the spec id, but
2283 -- we want them chained to the body id. Only the formal parameters
2284 -- end up chained to the spec id in this case.
2286 if Present
(Spec_Id
) then
2288 -- We must conform to the categorization of our spec
2290 Validate_Categorization_Dependency
(N
, Spec_Id
);
2292 -- And if this is a child unit, the parent units must conform
2294 if Is_Child_Unit
(Spec_Id
) then
2295 Validate_Categorization_Dependency
2296 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
2299 -- Here is where we move entities from the spec to the body
2301 -- Case where there are entities that stay with the spec
2303 if Present
(Last_Real_Spec_Entity
) then
2305 -- No body entities (happens when the only real spec entities
2306 -- come from precondition and postcondition pragmas)
2308 if No
(Last_Entity
(Body_Id
)) then
2310 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
2312 -- Body entities present (formals), so chain stuff past them
2316 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
2319 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
2320 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2321 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
2323 -- Case where there are no spec entities, in this case there can
2324 -- be no body entities either, so just move everything.
2327 pragma Assert
(No
(Last_Entity
(Body_Id
)));
2328 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
2329 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2330 Set_First_Entity
(Spec_Id
, Empty
);
2331 Set_Last_Entity
(Spec_Id
, Empty
);
2335 -- If function, check return statements
2337 if Nkind
(Body_Spec
) = N_Function_Specification
then
2342 if Present
(Spec_Id
) then
2348 if Return_Present
(Id
) then
2349 Check_Returns
(HSS
, 'F', Missing_Ret
);
2352 Set_Has_Missing_Return
(Id
);
2355 elsif not Is_Machine_Code_Subprogram
(Id
)
2356 and then not Body_Deleted
2358 Error_Msg_N
("missing RETURN statement in function body", N
);
2362 -- If procedure with No_Return, check returns
2364 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2365 and then Present
(Spec_Id
)
2366 and then No_Return
(Spec_Id
)
2368 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2371 -- Now we are going to check for variables that are never modified in
2372 -- the body of the procedure. But first we deal with a special case
2373 -- where we want to modify this check. If the body of the subprogram
2374 -- starts with a raise statement or its equivalent, or if the body
2375 -- consists entirely of a null statement, then it is pretty obvious
2376 -- that it is OK to not reference the parameters. For example, this
2377 -- might be the following common idiom for a stubbed function:
2378 -- statement of the procedure raises an exception. In particular this
2379 -- deals with the common idiom of a stubbed function, which might
2380 -- appear as something like
2382 -- function F (A : Integer) return Some_Type;
2385 -- raise Program_Error;
2389 -- Here the purpose of X is simply to satisfy the annoying requirement
2390 -- in Ada that there be at least one return, and we certainly do not
2391 -- want to go posting warnings on X that it is not initialized! On
2392 -- the other hand, if X is entirely unreferenced that should still
2395 -- What we do is to detect these cases, and if we find them, flag the
2396 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2397 -- suppress unwanted warnings. For the case of the function stub above
2398 -- we have a special test to set X as apparently assigned to suppress
2405 -- Skip initial labels (for one thing this occurs when we are in
2406 -- front end ZCX mode, but in any case it is irrelevant), and also
2407 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2409 Stm
:= First
(Statements
(HSS
));
2410 while Nkind
(Stm
) = N_Label
2411 or else Nkind
(Stm
) in N_Push_xxx_Label
2416 -- Do the test on the original statement before expansion
2419 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
2422 -- If explicit raise statement, turn on flag
2424 if Nkind
(Ostm
) = N_Raise_Statement
then
2425 Set_Trivial_Subprogram
(Stm
);
2427 -- If null statement, and no following statements, turn on flag
2429 elsif Nkind
(Stm
) = N_Null_Statement
2430 and then Comes_From_Source
(Stm
)
2431 and then No
(Next
(Stm
))
2433 Set_Trivial_Subprogram
(Stm
);
2435 -- Check for explicit call cases which likely raise an exception
2437 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
2438 if Is_Entity_Name
(Name
(Ostm
)) then
2440 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
2443 -- If the procedure is marked No_Return, then likely it
2444 -- raises an exception, but in any case it is not coming
2445 -- back here, so turn on the flag.
2447 if Ekind
(Ent
) = E_Procedure
2448 and then No_Return
(Ent
)
2450 Set_Trivial_Subprogram
(Stm
);
2458 -- Check for variables that are never modified
2464 -- If there is a separate spec, then transfer Never_Set_In_Source
2465 -- flags from out parameters to the corresponding entities in the
2466 -- body. The reason we do that is we want to post error flags on
2467 -- the body entities, not the spec entities.
2469 if Present
(Spec_Id
) then
2470 E1
:= First_Entity
(Spec_Id
);
2471 while Present
(E1
) loop
2472 if Ekind
(E1
) = E_Out_Parameter
then
2473 E2
:= First_Entity
(Body_Id
);
2474 while Present
(E2
) loop
2475 exit when Chars
(E1
) = Chars
(E2
);
2479 if Present
(E2
) then
2480 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
2488 -- Check references in body unless it was deleted. Note that the
2489 -- check of Body_Deleted here is not just for efficiency, it is
2490 -- necessary to avoid junk warnings on formal parameters.
2492 if not Body_Deleted
then
2493 Check_References
(Body_Id
);
2496 end Analyze_Subprogram_Body
;
2498 ------------------------------------
2499 -- Analyze_Subprogram_Declaration --
2500 ------------------------------------
2502 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
2503 Designator
: constant Entity_Id
:=
2504 Analyze_Subprogram_Specification
(Specification
(N
));
2505 Scop
: constant Entity_Id
:= Current_Scope
;
2507 -- Start of processing for Analyze_Subprogram_Declaration
2510 Generate_Definition
(Designator
);
2512 -- Check for RCI unit subprogram declarations for illegal inlined
2513 -- subprograms and subprograms having access parameter or limited
2514 -- parameter without Read and Write attributes (RM E.2.3(12-13)).
2516 Validate_RCI_Subprogram_Declaration
(N
);
2520 Defining_Entity
(N
),
2521 " Analyze subprogram spec: ");
2523 if Debug_Flag_C
then
2524 Write_Str
("==== Compiling subprogram spec ");
2525 Write_Name
(Chars
(Designator
));
2526 Write_Str
(" from ");
2527 Write_Location
(Sloc
(N
));
2531 New_Overloaded_Entity
(Designator
);
2532 Check_Delayed_Subprogram
(Designator
);
2534 -- If the type of the first formal of the current subprogram is a non
2535 -- generic tagged private type , mark the subprogram as being a private
2538 if Present
(First_Formal
(Designator
)) then
2540 Formal_Typ
: constant Entity_Id
:=
2541 Etype
(First_Formal
(Designator
));
2543 Set_Is_Private_Primitive
(Designator
,
2544 Is_Tagged_Type
(Formal_Typ
)
2545 and then Is_Private_Type
(Formal_Typ
)
2546 and then not Is_Generic_Actual_Type
(Formal_Typ
));
2550 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2553 if Ada_Version
>= Ada_05
2554 and then Comes_From_Source
(N
)
2555 and then Is_Dispatching_Operation
(Designator
)
2562 if Has_Controlling_Result
(Designator
) then
2563 Etyp
:= Etype
(Designator
);
2566 E
:= First_Entity
(Designator
);
2568 and then Is_Formal
(E
)
2569 and then not Is_Controlling_Formal
(E
)
2577 if Is_Access_Type
(Etyp
) then
2578 Etyp
:= Directly_Designated_Type
(Etyp
);
2581 if Is_Interface
(Etyp
)
2582 and then not Is_Abstract_Subprogram
(Designator
)
2583 and then not (Ekind
(Designator
) = E_Procedure
2584 and then Null_Present
(Specification
(N
)))
2586 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
2588 ("(Ada 2005) interface subprogram % must be abstract or null",
2594 -- What is the following code for, it used to be
2596 -- ??? Set_Suppress_Elaboration_Checks
2597 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2599 -- The following seems equivalent, but a bit dubious
2601 if Elaboration_Checks_Suppressed
(Designator
) then
2602 Set_Kill_Elaboration_Checks
(Designator
);
2605 if Scop
/= Standard_Standard
2606 and then not Is_Child_Unit
(Designator
)
2608 Set_Categorization_From_Scope
(Designator
, Scop
);
2610 -- For a compilation unit, check for library-unit pragmas
2612 Push_Scope
(Designator
);
2613 Set_Categorization_From_Pragmas
(N
);
2614 Validate_Categorization_Dependency
(N
, Designator
);
2618 -- For a compilation unit, set body required. This flag will only be
2619 -- reset if a valid Import or Interface pragma is processed later on.
2621 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2622 Set_Body_Required
(Parent
(N
), True);
2624 if Ada_Version
>= Ada_05
2625 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
2626 and then Null_Present
(Specification
(N
))
2629 ("null procedure cannot be declared at library level", N
);
2633 Generate_Reference_To_Formals
(Designator
);
2634 Check_Eliminated
(Designator
);
2636 -- Ada 2005: if procedure is declared with "is null" qualifier,
2637 -- it requires no body.
2639 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2640 and then Null_Present
(Specification
(N
))
2642 Set_Has_Completion
(Designator
);
2643 Set_Is_Inlined
(Designator
);
2645 if Is_Protected_Type
(Current_Scope
) then
2647 ("protected operation cannot be a null procedure", N
);
2650 end Analyze_Subprogram_Declaration
;
2652 --------------------------------------
2653 -- Analyze_Subprogram_Specification --
2654 --------------------------------------
2656 -- Reminder: N here really is a subprogram specification (not a subprogram
2657 -- declaration). This procedure is called to analyze the specification in
2658 -- both subprogram bodies and subprogram declarations (specs).
2660 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
2661 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2662 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
2664 -- Start of processing for Analyze_Subprogram_Specification
2667 Generate_Definition
(Designator
);
2669 if Nkind
(N
) = N_Function_Specification
then
2670 Set_Ekind
(Designator
, E_Function
);
2671 Set_Mechanism
(Designator
, Default_Mechanism
);
2674 Set_Ekind
(Designator
, E_Procedure
);
2675 Set_Etype
(Designator
, Standard_Void_Type
);
2678 -- Introduce new scope for analysis of the formals and the return type
2680 Set_Scope
(Designator
, Current_Scope
);
2682 if Present
(Formals
) then
2683 Push_Scope
(Designator
);
2684 Process_Formals
(Formals
, N
);
2686 -- Ada 2005 (AI-345): If this is an overriding operation of an
2687 -- inherited interface operation, and the controlling type is
2688 -- a synchronized type, replace the type with its corresponding
2689 -- record, to match the proper signature of an overriding operation.
2691 if Ada_Version
>= Ada_05
then
2694 Formal_Typ
: Entity_Id
;
2695 Rec_Typ
: Entity_Id
;
2698 Formal
:= First_Formal
(Designator
);
2699 while Present
(Formal
) loop
2700 Formal_Typ
:= Etype
(Formal
);
2702 if Is_Concurrent_Type
(Formal_Typ
)
2703 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2705 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
2707 if Present
(Interfaces
(Rec_Typ
)) then
2708 Set_Etype
(Formal
, Rec_Typ
);
2712 Next_Formal
(Formal
);
2719 elsif Nkind
(N
) = N_Function_Specification
then
2720 Analyze_Return_Type
(N
);
2723 if Nkind
(N
) = N_Function_Specification
then
2724 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
2725 Valid_Operator_Definition
(Designator
);
2728 May_Need_Actuals
(Designator
);
2730 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2731 -- the subprogram is abstract also. This does not apply to renaming
2732 -- declarations, where abstractness is inherited.
2733 -- In case of primitives associated with abstract interface types
2734 -- the check is applied later (see Analyze_Subprogram_Declaration).
2736 if Is_Abstract_Type
(Etype
(Designator
))
2737 and then not Is_Interface
(Etype
(Designator
))
2738 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
2739 and then Nkind
(Parent
(N
)) /=
2740 N_Abstract_Subprogram_Declaration
2742 (Nkind
(Parent
(N
))) /= N_Formal_Abstract_Subprogram_Declaration
2745 ("function that returns abstract type must be abstract", N
);
2750 end Analyze_Subprogram_Specification
;
2752 --------------------------
2753 -- Build_Body_To_Inline --
2754 --------------------------
2756 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
) is
2757 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
2758 Original_Body
: Node_Id
;
2759 Body_To_Analyze
: Node_Id
;
2760 Max_Size
: constant := 10;
2761 Stat_Count
: Integer := 0;
2763 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean;
2764 -- Check for declarations that make inlining not worthwhile
2766 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean;
2767 -- Check for statements that make inlining not worthwhile: any tasking
2768 -- statement, nested at any level. Keep track of total number of
2769 -- elementary statements, as a measure of acceptable size.
2771 function Has_Pending_Instantiation
return Boolean;
2772 -- If some enclosing body contains instantiations that appear before the
2773 -- corresponding generic body, the enclosing body has a freeze node so
2774 -- that it can be elaborated after the generic itself. This might
2775 -- conflict with subsequent inlinings, so that it is unsafe to try to
2776 -- inline in such a case.
2778 function Has_Single_Return
return Boolean;
2779 -- In general we cannot inline functions that return unconstrained type.
2780 -- However, we can handle such functions if all return statements return
2781 -- a local variable that is the only declaration in the body of the
2782 -- function. In that case the call can be replaced by that local
2783 -- variable as is done for other inlined calls.
2785 procedure Remove_Pragmas
;
2786 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2787 -- parameter has no meaning when the body is inlined and the formals
2788 -- are rewritten. Remove it from body to inline. The analysis of the
2789 -- non-inlined body will handle the pragma properly.
2791 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean;
2792 -- If the body of the subprogram includes a call that returns an
2793 -- unconstrained type, the secondary stack is involved, and it
2794 -- is not worth inlining.
2796 ------------------------------
2797 -- Has_Excluded_Declaration --
2798 ------------------------------
2800 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean is
2803 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean;
2804 -- Nested subprograms make a given body ineligible for inlining, but
2805 -- we make an exception for instantiations of unchecked conversion.
2806 -- The body has not been analyzed yet, so check the name, and verify
2807 -- that the visible entity with that name is the predefined unit.
2809 -----------------------------
2810 -- Is_Unchecked_Conversion --
2811 -----------------------------
2813 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean is
2814 Id
: constant Node_Id
:= Name
(D
);
2818 if Nkind
(Id
) = N_Identifier
2819 and then Chars
(Id
) = Name_Unchecked_Conversion
2821 Conv
:= Current_Entity
(Id
);
2823 elsif Nkind_In
(Id
, N_Selected_Component
, N_Expanded_Name
)
2824 and then Chars
(Selector_Name
(Id
)) = Name_Unchecked_Conversion
2826 Conv
:= Current_Entity
(Selector_Name
(Id
));
2831 return Present
(Conv
)
2832 and then Is_Predefined_File_Name
2833 (Unit_File_Name
(Get_Source_Unit
(Conv
)))
2834 and then Is_Intrinsic_Subprogram
(Conv
);
2835 end Is_Unchecked_Conversion
;
2837 -- Start of processing for Has_Excluded_Declaration
2841 while Present
(D
) loop
2842 if (Nkind
(D
) = N_Function_Instantiation
2843 and then not Is_Unchecked_Conversion
(D
))
2844 or else Nkind_In
(D
, N_Protected_Type_Declaration
,
2845 N_Package_Declaration
,
2846 N_Package_Instantiation
,
2848 N_Procedure_Instantiation
,
2849 N_Task_Type_Declaration
)
2852 ("cannot inline & (non-allowed declaration)?", D
, Subp
);
2860 end Has_Excluded_Declaration
;
2862 ----------------------------
2863 -- Has_Excluded_Statement --
2864 ----------------------------
2866 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean is
2872 while Present
(S
) loop
2873 Stat_Count
:= Stat_Count
+ 1;
2875 if Nkind_In
(S
, N_Abort_Statement
,
2876 N_Asynchronous_Select
,
2877 N_Conditional_Entry_Call
,
2878 N_Delay_Relative_Statement
,
2879 N_Delay_Until_Statement
,
2884 ("cannot inline & (non-allowed statement)?", S
, Subp
);
2887 elsif Nkind
(S
) = N_Block_Statement
then
2888 if Present
(Declarations
(S
))
2889 and then Has_Excluded_Declaration
(Declarations
(S
))
2893 elsif Present
(Handled_Statement_Sequence
(S
))
2896 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
2898 Has_Excluded_Statement
2899 (Statements
(Handled_Statement_Sequence
(S
))))
2904 elsif Nkind
(S
) = N_Case_Statement
then
2905 E
:= First
(Alternatives
(S
));
2906 while Present
(E
) loop
2907 if Has_Excluded_Statement
(Statements
(E
)) then
2914 elsif Nkind
(S
) = N_If_Statement
then
2915 if Has_Excluded_Statement
(Then_Statements
(S
)) then
2919 if Present
(Elsif_Parts
(S
)) then
2920 E
:= First
(Elsif_Parts
(S
));
2921 while Present
(E
) loop
2922 if Has_Excluded_Statement
(Then_Statements
(E
)) then
2929 if Present
(Else_Statements
(S
))
2930 and then Has_Excluded_Statement
(Else_Statements
(S
))
2935 elsif Nkind
(S
) = N_Loop_Statement
2936 and then Has_Excluded_Statement
(Statements
(S
))
2945 end Has_Excluded_Statement
;
2947 -------------------------------
2948 -- Has_Pending_Instantiation --
2949 -------------------------------
2951 function Has_Pending_Instantiation
return Boolean is
2956 while Present
(S
) loop
2957 if Is_Compilation_Unit
(S
)
2958 or else Is_Child_Unit
(S
)
2961 elsif Ekind
(S
) = E_Package
2962 and then Has_Forward_Instantiation
(S
)
2971 end Has_Pending_Instantiation
;
2973 ------------------------
2974 -- Has_Single_Return --
2975 ------------------------
2977 function Has_Single_Return
return Boolean is
2978 Return_Statement
: Node_Id
:= Empty
;
2980 function Check_Return
(N
: Node_Id
) return Traverse_Result
;
2986 function Check_Return
(N
: Node_Id
) return Traverse_Result
is
2988 if Nkind
(N
) = N_Simple_Return_Statement
then
2989 if Present
(Expression
(N
))
2990 and then Is_Entity_Name
(Expression
(N
))
2992 if No
(Return_Statement
) then
2993 Return_Statement
:= N
;
2996 elsif Chars
(Expression
(N
)) =
2997 Chars
(Expression
(Return_Statement
))
3006 -- Expression has wrong form
3016 function Check_All_Returns
is new Traverse_Func
(Check_Return
);
3018 -- Start of processing for Has_Single_Return
3021 return Check_All_Returns
(N
) = OK
3022 and then Present
(Declarations
(N
))
3023 and then Present
(First
(Declarations
(N
)))
3024 and then Chars
(Expression
(Return_Statement
)) =
3025 Chars
(Defining_Identifier
(First
(Declarations
(N
))));
3026 end Has_Single_Return
;
3028 --------------------
3029 -- Remove_Pragmas --
3030 --------------------
3032 procedure Remove_Pragmas
is
3037 Decl
:= First
(Declarations
(Body_To_Analyze
));
3038 while Present
(Decl
) loop
3041 if Nkind
(Decl
) = N_Pragma
3042 and then (Pragma_Name
(Decl
) = Name_Unreferenced
3044 Pragma_Name
(Decl
) = Name_Unmodified
)
3053 --------------------------
3054 -- Uses_Secondary_Stack --
3055 --------------------------
3057 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean is
3058 function Check_Call
(N
: Node_Id
) return Traverse_Result
;
3059 -- Look for function calls that return an unconstrained type
3065 function Check_Call
(N
: Node_Id
) return Traverse_Result
is
3067 if Nkind
(N
) = N_Function_Call
3068 and then Is_Entity_Name
(Name
(N
))
3069 and then Is_Composite_Type
(Etype
(Entity
(Name
(N
))))
3070 and then not Is_Constrained
(Etype
(Entity
(Name
(N
))))
3073 ("cannot inline & (call returns unconstrained type)?",
3081 function Check_Calls
is new Traverse_Func
(Check_Call
);
3084 return Check_Calls
(Bod
) = Abandon
;
3085 end Uses_Secondary_Stack
;
3087 -- Start of processing for Build_Body_To_Inline
3090 if Nkind
(Decl
) = N_Subprogram_Declaration
3091 and then Present
(Body_To_Inline
(Decl
))
3093 return; -- Done already.
3095 -- Functions that return unconstrained composite types require
3096 -- secondary stack handling, and cannot currently be inlined, unless
3097 -- all return statements return a local variable that is the first
3098 -- local declaration in the body.
3100 elsif Ekind
(Subp
) = E_Function
3101 and then not Is_Scalar_Type
(Etype
(Subp
))
3102 and then not Is_Access_Type
(Etype
(Subp
))
3103 and then not Is_Constrained
(Etype
(Subp
))
3105 if not Has_Single_Return
then
3107 ("cannot inline & (unconstrained return type)?", N
, Subp
);
3111 -- Ditto for functions that return controlled types, where controlled
3112 -- actions interfere in complex ways with inlining.
3114 elsif Ekind
(Subp
) = E_Function
3115 and then Controlled_Type
(Etype
(Subp
))
3118 ("cannot inline & (controlled return type)?", N
, Subp
);
3122 if Present
(Declarations
(N
))
3123 and then Has_Excluded_Declaration
(Declarations
(N
))
3128 if Present
(Handled_Statement_Sequence
(N
)) then
3129 if Present
(Exception_Handlers
(Handled_Statement_Sequence
(N
))) then
3131 ("cannot inline& (exception handler)?",
3132 First
(Exception_Handlers
(Handled_Statement_Sequence
(N
))),
3136 Has_Excluded_Statement
3137 (Statements
(Handled_Statement_Sequence
(N
)))
3143 -- We do not inline a subprogram that is too large, unless it is
3144 -- marked Inline_Always. This pragma does not suppress the other
3145 -- checks on inlining (forbidden declarations, handlers, etc).
3147 if Stat_Count
> Max_Size
3148 and then not Has_Pragma_Inline_Always
(Subp
)
3150 Cannot_Inline
("cannot inline& (body too large)?", N
, Subp
);
3154 if Has_Pending_Instantiation
then
3156 ("cannot inline& (forward instance within enclosing body)?",
3161 -- Within an instance, the body to inline must be treated as a nested
3162 -- generic, so that the proper global references are preserved.
3164 -- Note that we do not do this at the library level, because it is not
3165 -- needed, and furthermore this causes trouble if front end inlining
3166 -- is activated (-gnatN).
3168 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3169 Save_Env
(Scope
(Current_Scope
), Scope
(Current_Scope
));
3170 Original_Body
:= Copy_Generic_Node
(N
, Empty
, True);
3172 Original_Body
:= Copy_Separate_Tree
(N
);
3175 -- We need to capture references to the formals in order to substitute
3176 -- the actuals at the point of inlining, i.e. instantiation. To treat
3177 -- the formals as globals to the body to inline, we nest it within
3178 -- a dummy parameterless subprogram, declared within the real one.
3179 -- To avoid generating an internal name (which is never public, and
3180 -- which affects serial numbers of other generated names), we use
3181 -- an internal symbol that cannot conflict with user declarations.
3183 Set_Parameter_Specifications
(Specification
(Original_Body
), No_List
);
3184 Set_Defining_Unit_Name
3185 (Specification
(Original_Body
),
3186 Make_Defining_Identifier
(Sloc
(N
), Name_uParent
));
3187 Set_Corresponding_Spec
(Original_Body
, Empty
);
3189 Body_To_Analyze
:= Copy_Generic_Node
(Original_Body
, Empty
, False);
3191 -- Set return type of function, which is also global and does not need
3194 if Ekind
(Subp
) = E_Function
then
3195 Set_Result_Definition
(Specification
(Body_To_Analyze
),
3196 New_Occurrence_Of
(Etype
(Subp
), Sloc
(N
)));
3199 if No
(Declarations
(N
)) then
3200 Set_Declarations
(N
, New_List
(Body_To_Analyze
));
3202 Append
(Body_To_Analyze
, Declarations
(N
));
3205 Expander_Mode_Save_And_Set
(False);
3208 Analyze
(Body_To_Analyze
);
3209 Push_Scope
(Defining_Entity
(Body_To_Analyze
));
3210 Save_Global_References
(Original_Body
);
3212 Remove
(Body_To_Analyze
);
3214 Expander_Mode_Restore
;
3216 -- Restore environment if previously saved
3218 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3222 -- If secondary stk used there is no point in inlining. We have
3223 -- already issued the warning in this case, so nothing to do.
3225 if Uses_Secondary_Stack
(Body_To_Analyze
) then
3229 Set_Body_To_Inline
(Decl
, Original_Body
);
3230 Set_Ekind
(Defining_Entity
(Original_Body
), Ekind
(Subp
));
3231 Set_Is_Inlined
(Subp
);
3232 end Build_Body_To_Inline
;
3238 procedure Cannot_Inline
(Msg
: String; N
: Node_Id
; Subp
: Entity_Id
) is
3240 -- Do not emit warning if this is a predefined unit which is not
3241 -- the main unit. With validity checks enabled, some predefined
3242 -- subprograms may contain nested subprograms and become ineligible
3245 if Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(Subp
)))
3246 and then not In_Extended_Main_Source_Unit
(Subp
)
3250 elsif Has_Pragma_Inline_Always
(Subp
) then
3252 -- Remove last character (question mark) to make this into an error,
3253 -- because the Inline_Always pragma cannot be obeyed.
3255 Error_Msg_NE
(Msg
(Msg
'First .. Msg
'Last - 1), N
, Subp
);
3257 elsif Ineffective_Inline_Warnings
then
3258 Error_Msg_NE
(Msg
, N
, Subp
);
3262 -----------------------
3263 -- Check_Conformance --
3264 -----------------------
3266 procedure Check_Conformance
3267 (New_Id
: Entity_Id
;
3269 Ctype
: Conformance_Type
;
3271 Conforms
: out Boolean;
3272 Err_Loc
: Node_Id
:= Empty
;
3273 Get_Inst
: Boolean := False;
3274 Skip_Controlling_Formals
: Boolean := False)
3276 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
3277 -- Post error message for conformance error on given node. Two messages
3278 -- are output. The first points to the previous declaration with a
3279 -- general "no conformance" message. The second is the detailed reason,
3280 -- supplied as Msg. The parameter N provide information for a possible
3281 -- & insertion in the message, and also provides the location for
3282 -- posting the message in the absence of a specified Err_Loc location.
3284 -----------------------
3285 -- Conformance_Error --
3286 -----------------------
3288 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
3295 if No
(Err_Loc
) then
3301 Error_Msg_Sloc
:= Sloc
(Old_Id
);
3304 when Type_Conformant
=>
3306 ("not type conformant with declaration#!", Enode
);
3308 when Mode_Conformant
=>
3309 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3311 ("not mode conformant with operation inherited#!",
3315 ("not mode conformant with declaration#!", Enode
);
3318 when Subtype_Conformant
=>
3319 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3321 ("not subtype conformant with operation inherited#!",
3325 ("not subtype conformant with declaration#!", Enode
);
3328 when Fully_Conformant
=>
3329 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3331 ("not fully conformant with operation inherited#!",
3335 ("not fully conformant with declaration#!", Enode
);
3339 Error_Msg_NE
(Msg
, Enode
, N
);
3341 end Conformance_Error
;
3345 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
3346 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
3347 Old_Formal
: Entity_Id
;
3348 New_Formal
: Entity_Id
;
3349 Access_Types_Match
: Boolean;
3350 Old_Formal_Base
: Entity_Id
;
3351 New_Formal_Base
: Entity_Id
;
3353 -- Start of processing for Check_Conformance
3358 -- We need a special case for operators, since they don't appear
3361 if Ctype
= Type_Conformant
then
3362 if Ekind
(New_Id
) = E_Operator
3363 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
3369 -- If both are functions/operators, check return types conform
3371 if Old_Type
/= Standard_Void_Type
3372 and then New_Type
/= Standard_Void_Type
3375 -- If we are checking interface conformance we omit controlling
3376 -- arguments and result, because we are only checking the conformance
3377 -- of the remaining parameters.
3379 if Has_Controlling_Result
(Old_Id
)
3380 and then Has_Controlling_Result
(New_Id
)
3381 and then Skip_Controlling_Formals
3385 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
3386 Conformance_Error
("\return type does not match!", New_Id
);
3390 -- Ada 2005 (AI-231): In case of anonymous access types check the
3391 -- null-exclusion and access-to-constant attributes match.
3393 if Ada_Version
>= Ada_05
3394 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
3396 (Can_Never_Be_Null
(Old_Type
)
3397 /= Can_Never_Be_Null
(New_Type
)
3398 or else Is_Access_Constant
(Etype
(Old_Type
))
3399 /= Is_Access_Constant
(Etype
(New_Type
)))
3401 Conformance_Error
("\return type does not match!", New_Id
);
3405 -- If either is a function/operator and the other isn't, error
3407 elsif Old_Type
/= Standard_Void_Type
3408 or else New_Type
/= Standard_Void_Type
3410 Conformance_Error
("\functions can only match functions!", New_Id
);
3414 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3415 -- If this is a renaming as body, refine error message to indicate that
3416 -- the conflict is with the original declaration. If the entity is not
3417 -- frozen, the conventions don't have to match, the one of the renamed
3418 -- entity is inherited.
3420 if Ctype
>= Subtype_Conformant
then
3421 if Convention
(Old_Id
) /= Convention
(New_Id
) then
3423 if not Is_Frozen
(New_Id
) then
3426 elsif Present
(Err_Loc
)
3427 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
3428 and then Present
(Corresponding_Spec
(Err_Loc
))
3430 Error_Msg_Name_1
:= Chars
(New_Id
);
3432 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
3434 Conformance_Error
("\prior declaration for% has convention %!");
3437 Conformance_Error
("\calling conventions do not match!");
3442 elsif Is_Formal_Subprogram
(Old_Id
)
3443 or else Is_Formal_Subprogram
(New_Id
)
3445 Conformance_Error
("\formal subprograms not allowed!");
3450 -- Deal with parameters
3452 -- Note: we use the entity information, rather than going directly
3453 -- to the specification in the tree. This is not only simpler, but
3454 -- absolutely necessary for some cases of conformance tests between
3455 -- operators, where the declaration tree simply does not exist!
3457 Old_Formal
:= First_Formal
(Old_Id
);
3458 New_Formal
:= First_Formal
(New_Id
);
3460 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
3461 if Is_Controlling_Formal
(Old_Formal
)
3462 and then Is_Controlling_Formal
(New_Formal
)
3463 and then Skip_Controlling_Formals
3465 goto Skip_Controlling_Formal
;
3468 if Ctype
= Fully_Conformant
then
3470 -- Names must match. Error message is more accurate if we do
3471 -- this before checking that the types of the formals match.
3473 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
3474 Conformance_Error
("\name & does not match!", New_Formal
);
3476 -- Set error posted flag on new formal as well to stop
3477 -- junk cascaded messages in some cases.
3479 Set_Error_Posted
(New_Formal
);
3484 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3485 -- case occurs whenever a subprogram is being renamed and one of its
3486 -- parameters imposes a null exclusion. For example:
3488 -- type T is null record;
3489 -- type Acc_T is access T;
3490 -- subtype Acc_T_Sub is Acc_T;
3492 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3493 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3496 Old_Formal_Base
:= Etype
(Old_Formal
);
3497 New_Formal_Base
:= Etype
(New_Formal
);
3500 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
3501 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
3504 Access_Types_Match
:= Ada_Version
>= Ada_05
3506 -- Ensure that this rule is only applied when New_Id is a
3507 -- renaming of Old_Id.
3509 and then Nkind
(Parent
(Parent
(New_Id
))) =
3510 N_Subprogram_Renaming_Declaration
3511 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
3512 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
3513 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
3515 -- Now handle the allowed access-type case
3517 and then Is_Access_Type
(Old_Formal_Base
)
3518 and then Is_Access_Type
(New_Formal_Base
)
3520 -- The type kinds must match. The only exception occurs with
3521 -- multiple generics of the form:
3524 -- type F is private; type A is private;
3525 -- type F_Ptr is access F; type A_Ptr is access A;
3526 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3527 -- package F_Pack is ... package A_Pack is
3528 -- package F_Inst is
3529 -- new F_Pack (A, A_Ptr, A_P);
3531 -- When checking for conformance between the parameters of A_P
3532 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3533 -- because the compiler has transformed A_Ptr into a subtype of
3534 -- F_Ptr. We catch this case in the code below.
3536 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
3538 (Is_Generic_Type
(Old_Formal_Base
)
3539 and then Is_Generic_Type
(New_Formal_Base
)
3540 and then Is_Internal
(New_Formal_Base
)
3541 and then Etype
(Etype
(New_Formal_Base
)) =
3543 and then Directly_Designated_Type
(Old_Formal_Base
) =
3544 Directly_Designated_Type
(New_Formal_Base
)
3545 and then ((Is_Itype
(Old_Formal_Base
)
3546 and then Can_Never_Be_Null
(Old_Formal_Base
))
3548 (Is_Itype
(New_Formal_Base
)
3549 and then Can_Never_Be_Null
(New_Formal_Base
)));
3551 -- Types must always match. In the visible part of an instance,
3552 -- usual overloading rules for dispatching operations apply, and
3553 -- we check base types (not the actual subtypes).
3555 if In_Instance_Visible_Part
3556 and then Is_Dispatching_Operation
(New_Id
)
3558 if not Conforming_Types
3559 (T1
=> Base_Type
(Etype
(Old_Formal
)),
3560 T2
=> Base_Type
(Etype
(New_Formal
)),
3562 Get_Inst
=> Get_Inst
)
3563 and then not Access_Types_Match
3565 Conformance_Error
("\type of & does not match!", New_Formal
);
3569 elsif not Conforming_Types
3570 (T1
=> Old_Formal_Base
,
3571 T2
=> New_Formal_Base
,
3573 Get_Inst
=> Get_Inst
)
3574 and then not Access_Types_Match
3576 Conformance_Error
("\type of & does not match!", New_Formal
);
3580 -- For mode conformance, mode must match
3582 if Ctype
>= Mode_Conformant
then
3583 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
3584 Conformance_Error
("\mode of & does not match!", New_Formal
);
3587 -- Part of mode conformance for access types is having the same
3588 -- constant modifier.
3590 elsif Access_Types_Match
3591 and then Is_Access_Constant
(Old_Formal_Base
) /=
3592 Is_Access_Constant
(New_Formal_Base
)
3595 ("\constant modifier does not match!", New_Formal
);
3600 if Ctype
>= Subtype_Conformant
then
3602 -- Ada 2005 (AI-231): In case of anonymous access types check
3603 -- the null-exclusion and access-to-constant attributes must
3606 if Ada_Version
>= Ada_05
3607 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
3608 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
3610 (Can_Never_Be_Null
(Old_Formal
) /=
3611 Can_Never_Be_Null
(New_Formal
)
3613 Is_Access_Constant
(Etype
(Old_Formal
)) /=
3614 Is_Access_Constant
(Etype
(New_Formal
)))
3616 -- It is allowed to omit the null-exclusion in case of stream
3617 -- attribute subprograms. We recognize stream subprograms
3618 -- through their TSS-generated suffix.
3621 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
3623 if TSS_Name
/= TSS_Stream_Read
3624 and then TSS_Name
/= TSS_Stream_Write
3625 and then TSS_Name
/= TSS_Stream_Input
3626 and then TSS_Name
/= TSS_Stream_Output
3629 ("\type of & does not match!", New_Formal
);
3636 -- Full conformance checks
3638 if Ctype
= Fully_Conformant
then
3640 -- We have checked already that names match
3642 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
3644 -- Check default expressions for in parameters
3647 NewD
: constant Boolean :=
3648 Present
(Default_Value
(New_Formal
));
3649 OldD
: constant Boolean :=
3650 Present
(Default_Value
(Old_Formal
));
3652 if NewD
or OldD
then
3654 -- The old default value has been analyzed because the
3655 -- current full declaration will have frozen everything
3656 -- before. The new default value has not been analyzed,
3657 -- so analyze it now before we check for conformance.
3660 Push_Scope
(New_Id
);
3661 Preanalyze_Spec_Expression
3662 (Default_Value
(New_Formal
), Etype
(New_Formal
));
3666 if not (NewD
and OldD
)
3667 or else not Fully_Conformant_Expressions
3668 (Default_Value
(Old_Formal
),
3669 Default_Value
(New_Formal
))
3672 ("\default expression for & does not match!",
3681 -- A couple of special checks for Ada 83 mode. These checks are
3682 -- skipped if either entity is an operator in package Standard,
3683 -- or if either old or new instance is not from the source program.
3685 if Ada_Version
= Ada_83
3686 and then Sloc
(Old_Id
) > Standard_Location
3687 and then Sloc
(New_Id
) > Standard_Location
3688 and then Comes_From_Source
(Old_Id
)
3689 and then Comes_From_Source
(New_Id
)
3692 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
3693 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
3696 -- Explicit IN must be present or absent in both cases. This
3697 -- test is required only in the full conformance case.
3699 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
3700 and then Ctype
= Fully_Conformant
3703 ("\(Ada 83) IN must appear in both declarations",
3708 -- Grouping (use of comma in param lists) must be the same
3709 -- This is where we catch a misconformance like:
3712 -- A : Integer; B : Integer
3714 -- which are represented identically in the tree except
3715 -- for the setting of the flags More_Ids and Prev_Ids.
3717 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
3718 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
3721 ("\grouping of & does not match!", New_Formal
);
3727 -- This label is required when skipping controlling formals
3729 <<Skip_Controlling_Formal
>>
3731 Next_Formal
(Old_Formal
);
3732 Next_Formal
(New_Formal
);
3735 if Present
(Old_Formal
) then
3736 Conformance_Error
("\too few parameters!");
3739 elsif Present
(New_Formal
) then
3740 Conformance_Error
("\too many parameters!", New_Formal
);
3743 end Check_Conformance
;
3745 -----------------------
3746 -- Check_Conventions --
3747 -----------------------
3749 procedure Check_Conventions
(Typ
: Entity_Id
) is
3750 Ifaces_List
: Elist_Id
;
3752 procedure Check_Convention
(Op
: Entity_Id
);
3753 -- Verify that the convention of inherited dispatching operation Op is
3754 -- consistent among all subprograms it overrides. In order to minimize
3755 -- the search, Search_From is utilized to designate a specific point in
3756 -- the list rather than iterating over the whole list once more.
3758 ----------------------
3759 -- Check_Convention --
3760 ----------------------
3762 procedure Check_Convention
(Op
: Entity_Id
) is
3763 Iface_Elmt
: Elmt_Id
;
3764 Iface_Prim_Elmt
: Elmt_Id
;
3765 Iface_Prim
: Entity_Id
;
3768 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
3769 while Present
(Iface_Elmt
) loop
3771 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
3772 while Present
(Iface_Prim_Elmt
) loop
3773 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
3775 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
3776 and then Convention
(Iface_Prim
) /= Convention
(Op
)
3779 ("inconsistent conventions in primitive operations", Typ
);
3781 Error_Msg_Name_1
:= Chars
(Op
);
3782 Error_Msg_Name_2
:= Get_Convention_Name
(Convention
(Op
));
3783 Error_Msg_Sloc
:= Sloc
(Op
);
3785 if Comes_From_Source
(Op
) then
3786 if not Is_Overriding_Operation
(Op
) then
3787 Error_Msg_N
("\\primitive % defined #", Typ
);
3789 Error_Msg_N
("\\overriding operation % with " &
3790 "convention % defined #", Typ
);
3793 else pragma Assert
(Present
(Alias
(Op
)));
3794 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
3795 Error_Msg_N
("\\inherited operation % with " &
3796 "convention % defined #", Typ
);
3799 Error_Msg_Name_1
:= Chars
(Op
);
3801 Get_Convention_Name
(Convention
(Iface_Prim
));
3802 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
3803 Error_Msg_N
("\\overridden operation % with " &
3804 "convention % defined #", Typ
);
3806 -- Avoid cascading errors
3811 Next_Elmt
(Iface_Prim_Elmt
);
3814 Next_Elmt
(Iface_Elmt
);
3816 end Check_Convention
;
3820 Prim_Op
: Entity_Id
;
3821 Prim_Op_Elmt
: Elmt_Id
;
3823 -- Start of processing for Check_Conventions
3826 if not Has_Interfaces
(Typ
) then
3830 Collect_Interfaces
(Typ
, Ifaces_List
);
3832 -- The algorithm checks every overriding dispatching operation against
3833 -- all the corresponding overridden dispatching operations, detecting
3834 -- differences in conventions.
3836 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
3837 while Present
(Prim_Op_Elmt
) loop
3838 Prim_Op
:= Node
(Prim_Op_Elmt
);
3840 -- A small optimization: skip the predefined dispatching operations
3841 -- since they always have the same convention.
3843 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
3844 Check_Convention
(Prim_Op
);
3847 Next_Elmt
(Prim_Op_Elmt
);
3849 end Check_Conventions
;
3851 ------------------------------
3852 -- Check_Delayed_Subprogram --
3853 ------------------------------
3855 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
3858 procedure Possible_Freeze
(T
: Entity_Id
);
3859 -- T is the type of either a formal parameter or of the return type.
3860 -- If T is not yet frozen and needs a delayed freeze, then the
3861 -- subprogram itself must be delayed.
3863 ---------------------
3864 -- Possible_Freeze --
3865 ---------------------
3867 procedure Possible_Freeze
(T
: Entity_Id
) is
3869 if Has_Delayed_Freeze
(T
)
3870 and then not Is_Frozen
(T
)
3872 Set_Has_Delayed_Freeze
(Designator
);
3874 elsif Is_Access_Type
(T
)
3875 and then Has_Delayed_Freeze
(Designated_Type
(T
))
3876 and then not Is_Frozen
(Designated_Type
(T
))
3878 Set_Has_Delayed_Freeze
(Designator
);
3880 end Possible_Freeze
;
3882 -- Start of processing for Check_Delayed_Subprogram
3885 -- Never need to freeze abstract subprogram
3887 if Ekind
(Designator
) /= E_Subprogram_Type
3888 and then Is_Abstract_Subprogram
(Designator
)
3892 -- Need delayed freeze if return type itself needs a delayed
3893 -- freeze and is not yet frozen.
3895 Possible_Freeze
(Etype
(Designator
));
3896 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
3898 -- Need delayed freeze if any of the formal types themselves need
3899 -- a delayed freeze and are not yet frozen.
3901 F
:= First_Formal
(Designator
);
3902 while Present
(F
) loop
3903 Possible_Freeze
(Etype
(F
));
3904 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
3909 -- Mark functions that return by reference. Note that it cannot be
3910 -- done for delayed_freeze subprograms because the underlying
3911 -- returned type may not be known yet (for private types)
3913 if not Has_Delayed_Freeze
(Designator
)
3914 and then Expander_Active
3917 Typ
: constant Entity_Id
:= Etype
(Designator
);
3918 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
3921 if Is_Inherently_Limited_Type
(Typ
) then
3922 Set_Returns_By_Ref
(Designator
);
3924 elsif Present
(Utyp
) and then CW_Or_Controlled_Type
(Utyp
) then
3925 Set_Returns_By_Ref
(Designator
);
3929 end Check_Delayed_Subprogram
;
3931 ------------------------------------
3932 -- Check_Discriminant_Conformance --
3933 ------------------------------------
3935 procedure Check_Discriminant_Conformance
3940 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
3941 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
3942 New_Discr_Id
: Entity_Id
;
3943 New_Discr_Type
: Entity_Id
;
3945 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
3946 -- Post error message for conformance error on given node. Two messages
3947 -- are output. The first points to the previous declaration with a
3948 -- general "no conformance" message. The second is the detailed reason,
3949 -- supplied as Msg. The parameter N provide information for a possible
3950 -- & insertion in the message.
3952 -----------------------
3953 -- Conformance_Error --
3954 -----------------------
3956 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
3958 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
3959 Error_Msg_N
("not fully conformant with declaration#!", N
);
3960 Error_Msg_NE
(Msg
, N
, N
);
3961 end Conformance_Error
;
3963 -- Start of processing for Check_Discriminant_Conformance
3966 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
3968 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
3970 -- The subtype mark of the discriminant on the full type has not
3971 -- been analyzed so we do it here. For an access discriminant a new
3974 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
3976 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
3979 Analyze
(Discriminant_Type
(New_Discr
));
3980 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
3983 if not Conforming_Types
3984 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
3986 Conformance_Error
("type of & does not match!", New_Discr_Id
);
3989 -- Treat the new discriminant as an occurrence of the old one,
3990 -- for navigation purposes, and fill in some semantic
3991 -- information, for completeness.
3993 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
3994 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
3995 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
4000 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
4001 Conformance_Error
("name & does not match!", New_Discr_Id
);
4005 -- Default expressions must match
4008 NewD
: constant Boolean :=
4009 Present
(Expression
(New_Discr
));
4010 OldD
: constant Boolean :=
4011 Present
(Expression
(Parent
(Old_Discr
)));
4014 if NewD
or OldD
then
4016 -- The old default value has been analyzed and expanded,
4017 -- because the current full declaration will have frozen
4018 -- everything before. The new default values have not been
4019 -- expanded, so expand now to check conformance.
4022 Preanalyze_Spec_Expression
4023 (Expression
(New_Discr
), New_Discr_Type
);
4026 if not (NewD
and OldD
)
4027 or else not Fully_Conformant_Expressions
4028 (Expression
(Parent
(Old_Discr
)),
4029 Expression
(New_Discr
))
4033 ("default expression for & does not match!",
4040 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4042 if Ada_Version
= Ada_83
then
4044 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
4047 -- Grouping (use of comma in param lists) must be the same
4048 -- This is where we catch a misconformance like:
4051 -- A : Integer; B : Integer
4053 -- which are represented identically in the tree except
4054 -- for the setting of the flags More_Ids and Prev_Ids.
4056 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
4057 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
4060 ("grouping of & does not match!", New_Discr_Id
);
4066 Next_Discriminant
(Old_Discr
);
4070 if Present
(Old_Discr
) then
4071 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
4074 elsif Present
(New_Discr
) then
4076 ("too many discriminants!", Defining_Identifier
(New_Discr
));
4079 end Check_Discriminant_Conformance
;
4081 ----------------------------
4082 -- Check_Fully_Conformant --
4083 ----------------------------
4085 procedure Check_Fully_Conformant
4086 (New_Id
: Entity_Id
;
4088 Err_Loc
: Node_Id
:= Empty
)
4091 pragma Warnings
(Off
, Result
);
4094 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
4095 end Check_Fully_Conformant
;
4097 ---------------------------
4098 -- Check_Mode_Conformant --
4099 ---------------------------
4101 procedure Check_Mode_Conformant
4102 (New_Id
: Entity_Id
;
4104 Err_Loc
: Node_Id
:= Empty
;
4105 Get_Inst
: Boolean := False)
4108 pragma Warnings
(Off
, Result
);
4111 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
4112 end Check_Mode_Conformant
;
4114 --------------------------------
4115 -- Check_Overriding_Indicator --
4116 --------------------------------
4118 procedure Check_Overriding_Indicator
4120 Overridden_Subp
: Entity_Id
;
4121 Is_Primitive
: Boolean)
4127 -- No overriding indicator for literals
4129 if Ekind
(Subp
) = E_Enumeration_Literal
then
4132 elsif Ekind
(Subp
) = E_Entry
then
4133 Decl
:= Parent
(Subp
);
4136 Decl
:= Unit_Declaration_Node
(Subp
);
4139 if Nkind_In
(Decl
, N_Subprogram_Body
,
4140 N_Subprogram_Body_Stub
,
4141 N_Subprogram_Declaration
,
4142 N_Abstract_Subprogram_Declaration
,
4143 N_Subprogram_Renaming_Declaration
)
4145 Spec
:= Specification
(Decl
);
4147 elsif Nkind
(Decl
) = N_Entry_Declaration
then
4154 if Present
(Overridden_Subp
) then
4155 if Must_Not_Override
(Spec
) then
4156 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
4158 if Ekind
(Subp
) = E_Entry
then
4160 ("entry & overrides inherited operation #", Spec
, Subp
);
4163 ("subprogram & overrides inherited operation #", Spec
, Subp
);
4166 elsif Is_Subprogram
(Subp
) then
4167 Set_Is_Overriding_Operation
(Subp
);
4170 -- If Subp is an operator, it may override a predefined operation.
4171 -- In that case overridden_subp is empty because of our implicit
4172 -- representation for predefined operators. We have to check whether the
4173 -- signature of Subp matches that of a predefined operator. Note that
4174 -- first argument provides the name of the operator, and the second
4175 -- argument the signature that may match that of a standard operation.
4176 -- If the indicator is overriding, then the operator must match a
4177 -- predefined signature, because we know already that there is no
4178 -- explicit overridden operation.
4180 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
4182 if Must_Not_Override
(Spec
) then
4183 if not Is_Primitive
then
4185 ("overriding indicator only allowed "
4186 & "if subprogram is primitive", Subp
);
4188 elsif Operator_Matches_Spec
(Subp
, Subp
) then
4190 ("subprogram & overrides predefined operator ", Spec
, Subp
);
4193 elsif Is_Overriding_Operation
(Subp
) then
4196 elsif Must_Override
(Spec
) then
4197 if not Operator_Matches_Spec
(Subp
, Subp
) then
4198 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4201 Set_Is_Overriding_Operation
(Subp
);
4205 elsif Must_Override
(Spec
) then
4206 if Ekind
(Subp
) = E_Entry
then
4207 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
4209 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4212 -- If the operation is marked "not overriding" and it's not primitive
4213 -- then an error is issued, unless this is an operation of a task or
4214 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4215 -- has been specified have already been checked above.
4217 elsif Must_Not_Override
(Spec
)
4218 and then not Is_Primitive
4219 and then Ekind
(Subp
) /= E_Entry
4220 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4223 ("overriding indicator only allowed if subprogram is primitive",
4227 end Check_Overriding_Indicator
;
4233 -- Note: this procedure needs to know far too much about how the expander
4234 -- messes with exceptions. The use of the flag Exception_Junk and the
4235 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4236 -- works, but is not very clean. It would be better if the expansion
4237 -- routines would leave Original_Node working nicely, and we could use
4238 -- Original_Node here to ignore all the peculiar expander messing ???
4240 procedure Check_Returns
4244 Proc
: Entity_Id
:= Empty
)
4248 procedure Check_Statement_Sequence
(L
: List_Id
);
4249 -- Internal recursive procedure to check a list of statements for proper
4250 -- termination by a return statement (or a transfer of control or a
4251 -- compound statement that is itself internally properly terminated).
4253 ------------------------------
4254 -- Check_Statement_Sequence --
4255 ------------------------------
4257 procedure Check_Statement_Sequence
(L
: List_Id
) is
4262 Raise_Exception_Call
: Boolean;
4263 -- Set True if statement sequence terminated by Raise_Exception call
4264 -- or a Reraise_Occurrence call.
4267 Raise_Exception_Call
:= False;
4269 -- Get last real statement
4271 Last_Stm
:= Last
(L
);
4273 -- Deal with digging out exception handler statement sequences that
4274 -- have been transformed by the local raise to goto optimization.
4275 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4276 -- optimization has occurred, we are looking at something like:
4279 -- original stmts in block
4283 -- goto L1; | omitted if No_Exception_Propagation
4288 -- goto L3; -- skip handler when exception not raised
4290 -- <<L1>> -- target label for local exception
4304 -- and what we have to do is to dig out the estmts1 and estmts2
4305 -- sequences (which were the original sequences of statements in
4306 -- the exception handlers) and check them.
4308 if Nkind
(Last_Stm
) = N_Label
4309 and then Exception_Junk
(Last_Stm
)
4315 exit when Nkind
(Stm
) /= N_Block_Statement
;
4316 exit when not Exception_Junk
(Stm
);
4319 exit when Nkind
(Stm
) /= N_Label
;
4320 exit when not Exception_Junk
(Stm
);
4321 Check_Statement_Sequence
4322 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
4327 exit when Nkind
(Stm
) /= N_Goto_Statement
;
4328 exit when not Exception_Junk
(Stm
);
4332 -- Don't count pragmas
4334 while Nkind
(Last_Stm
) = N_Pragma
4336 -- Don't count call to SS_Release (can happen after Raise_Exception)
4339 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
4341 Nkind
(Name
(Last_Stm
)) = N_Identifier
4343 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
4345 -- Don't count exception junk
4348 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
4350 N_Object_Declaration
)
4351 and then Exception_Junk
(Last_Stm
))
4352 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
4353 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
4358 -- Here we have the "real" last statement
4360 Kind
:= Nkind
(Last_Stm
);
4362 -- Transfer of control, OK. Note that in the No_Return procedure
4363 -- case, we already diagnosed any explicit return statements, so
4364 -- we can treat them as OK in this context.
4366 if Is_Transfer
(Last_Stm
) then
4369 -- Check cases of explicit non-indirect procedure calls
4371 elsif Kind
= N_Procedure_Call_Statement
4372 and then Is_Entity_Name
(Name
(Last_Stm
))
4374 -- Check call to Raise_Exception procedure which is treated
4375 -- specially, as is a call to Reraise_Occurrence.
4377 -- We suppress the warning in these cases since it is likely that
4378 -- the programmer really does not expect to deal with the case
4379 -- of Null_Occurrence, and thus would find a warning about a
4380 -- missing return curious, and raising Program_Error does not
4381 -- seem such a bad behavior if this does occur.
4383 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4384 -- behavior will be to raise Constraint_Error (see AI-329).
4386 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
4388 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
4390 Raise_Exception_Call
:= True;
4392 -- For Raise_Exception call, test first argument, if it is
4393 -- an attribute reference for a 'Identity call, then we know
4394 -- that the call cannot possibly return.
4397 Arg
: constant Node_Id
:=
4398 Original_Node
(First_Actual
(Last_Stm
));
4400 if Nkind
(Arg
) = N_Attribute_Reference
4401 and then Attribute_Name
(Arg
) = Name_Identity
4408 -- If statement, need to look inside if there is an else and check
4409 -- each constituent statement sequence for proper termination.
4411 elsif Kind
= N_If_Statement
4412 and then Present
(Else_Statements
(Last_Stm
))
4414 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
4415 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4417 if Present
(Elsif_Parts
(Last_Stm
)) then
4419 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
4422 while Present
(Elsif_Part
) loop
4423 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
4431 -- Case statement, check each case for proper termination
4433 elsif Kind
= N_Case_Statement
then
4437 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
4438 while Present
(Case_Alt
) loop
4439 Check_Statement_Sequence
(Statements
(Case_Alt
));
4440 Next_Non_Pragma
(Case_Alt
);
4446 -- Block statement, check its handled sequence of statements
4448 elsif Kind
= N_Block_Statement
then
4454 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
4463 -- Loop statement. If there is an iteration scheme, we can definitely
4464 -- fall out of the loop. Similarly if there is an exit statement, we
4465 -- can fall out. In either case we need a following return.
4467 elsif Kind
= N_Loop_Statement
then
4468 if Present
(Iteration_Scheme
(Last_Stm
))
4469 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
4473 -- A loop with no exit statement or iteration scheme is either
4474 -- an infinite loop, or it has some other exit (raise/return).
4475 -- In either case, no warning is required.
4481 -- Timed entry call, check entry call and delay alternatives
4483 -- Note: in expanded code, the timed entry call has been converted
4484 -- to a set of expanded statements on which the check will work
4485 -- correctly in any case.
4487 elsif Kind
= N_Timed_Entry_Call
then
4489 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4490 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
4493 -- If statement sequence of entry call alternative is missing,
4494 -- then we can definitely fall through, and we post the error
4495 -- message on the entry call alternative itself.
4497 if No
(Statements
(ECA
)) then
4500 -- If statement sequence of delay alternative is missing, then
4501 -- we can definitely fall through, and we post the error
4502 -- message on the delay alternative itself.
4504 -- Note: if both ECA and DCA are missing the return, then we
4505 -- post only one message, should be enough to fix the bugs.
4506 -- If not we will get a message next time on the DCA when the
4509 elsif No
(Statements
(DCA
)) then
4512 -- Else check both statement sequences
4515 Check_Statement_Sequence
(Statements
(ECA
));
4516 Check_Statement_Sequence
(Statements
(DCA
));
4521 -- Conditional entry call, check entry call and else part
4523 -- Note: in expanded code, the conditional entry call has been
4524 -- converted to a set of expanded statements on which the check
4525 -- will work correctly in any case.
4527 elsif Kind
= N_Conditional_Entry_Call
then
4529 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4532 -- If statement sequence of entry call alternative is missing,
4533 -- then we can definitely fall through, and we post the error
4534 -- message on the entry call alternative itself.
4536 if No
(Statements
(ECA
)) then
4539 -- Else check statement sequence and else part
4542 Check_Statement_Sequence
(Statements
(ECA
));
4543 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4549 -- If we fall through, issue appropriate message
4552 if not Raise_Exception_Call
then
4554 ("?RETURN statement missing following this statement!",
4557 ("\?Program_Error may be raised at run time!",
4561 -- Note: we set Err even though we have not issued a warning
4562 -- because we still have a case of a missing return. This is
4563 -- an extremely marginal case, probably will never be noticed
4564 -- but we might as well get it right.
4568 -- Otherwise we have the case of a procedure marked No_Return
4571 if not Raise_Exception_Call
then
4573 ("?implied return after this statement " &
4574 "will raise Program_Error",
4577 ("\?procedure & is marked as No_Return!",
4582 RE
: constant Node_Id
:=
4583 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
4584 Reason
=> PE_Implicit_Return
);
4586 Insert_After
(Last_Stm
, RE
);
4590 end Check_Statement_Sequence
;
4592 -- Start of processing for Check_Returns
4596 Check_Statement_Sequence
(Statements
(HSS
));
4598 if Present
(Exception_Handlers
(HSS
)) then
4599 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
4600 while Present
(Handler
) loop
4601 Check_Statement_Sequence
(Statements
(Handler
));
4602 Next_Non_Pragma
(Handler
);
4607 ----------------------------
4608 -- Check_Subprogram_Order --
4609 ----------------------------
4611 procedure Check_Subprogram_Order
(N
: Node_Id
) is
4613 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
4614 -- This is used to check if S1 > S2 in the sense required by this
4615 -- test, for example nameab < namec, but name2 < name10.
4617 -----------------------------
4618 -- Subprogram_Name_Greater --
4619 -----------------------------
4621 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
4626 -- Remove trailing numeric parts
4629 while S1
(L1
) in '0' .. '9' loop
4634 while S2
(L2
) in '0' .. '9' loop
4638 -- If non-numeric parts non-equal, that's decisive
4640 if S1
(S1
'First .. L1
) < S2
(S2
'First .. L2
) then
4643 elsif S1
(S1
'First .. L1
) > S2
(S2
'First .. L2
) then
4646 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4647 -- that a missing suffix is treated as numeric zero in this test.
4651 while L1
< S1
'Last loop
4653 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
4657 while L2
< S2
'Last loop
4659 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
4664 end Subprogram_Name_Greater
;
4666 -- Start of processing for Check_Subprogram_Order
4669 -- Check body in alpha order if this is option
4672 and then Style_Check_Order_Subprograms
4673 and then Nkind
(N
) = N_Subprogram_Body
4674 and then Comes_From_Source
(N
)
4675 and then In_Extended_Main_Source_Unit
(N
)
4679 renames Scope_Stack
.Table
4680 (Scope_Stack
.Last
).Last_Subprogram_Name
;
4682 Body_Id
: constant Entity_Id
:=
4683 Defining_Entity
(Specification
(N
));
4686 Get_Decoded_Name_String
(Chars
(Body_Id
));
4689 if Subprogram_Name_Greater
4690 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
4692 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
4698 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
4701 end Check_Subprogram_Order;
4703 ------------------------------
4704 -- Check_Subtype_Conformant --
4705 ------------------------------
4707 procedure Check_Subtype_Conformant
4708 (New_Id : Entity_Id;
4710 Err_Loc : Node_Id := Empty;
4711 Skip_Controlling_Formals : Boolean := False)
4714 pragma Warnings (Off, Result);
4717 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
4718 Skip_Controlling_Formals => Skip_Controlling_Formals);
4719 end Check_Subtype_Conformant;
4721 ---------------------------
4722 -- Check_Type_Conformant --
4723 ---------------------------
4725 procedure Check_Type_Conformant
4726 (New_Id : Entity_Id;
4728 Err_Loc : Node_Id := Empty)
4731 pragma Warnings (Off, Result);
4734 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
4735 end Check_Type_Conformant;
4737 ----------------------
4738 -- Conforming_Types --
4739 ----------------------
4741 function Conforming_Types
4744 Ctype : Conformance_Type;
4745 Get_Inst : Boolean := False) return Boolean
4747 Type_1 : Entity_Id := T1;
4748 Type_2 : Entity_Id := T2;
4749 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
4751 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
4752 -- If neither T1 nor T2 are generic actual types, or if they are in
4753 -- different scopes (e.g. parent and child instances), then verify that
4754 -- the base types are equal. Otherwise T1 and T2 must be on the same
4755 -- subtype chain. The whole purpose of this procedure is to prevent
4756 -- spurious ambiguities in an instantiation that may arise if two
4757 -- distinct generic types are instantiated with the same actual.
4759 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
4760 -- An access parameter can designate an incomplete type. If the
4761 -- incomplete type is the limited view of a type from a limited_
4762 -- with_clause, check whether the non-limited view is available. If
4763 -- it is a (non-limited) incomplete type, get the full view.
4765 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
4766 -- Returns True if and only if either T1 denotes a limited view of T2
4767 -- or T2 denotes a limited view of T1. This can arise when the limited
4768 -- with view of a type is used in a subprogram declaration and the
4769 -- subprogram body is in the scope of a regular with clause for the
4770 -- same unit. In such a case, the two type entities can be considered
4771 -- identical for purposes of conformance checking.
4773 ----------------------
4774 -- Base_Types_Match --
4775 ----------------------
4777 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
4782 elsif Base_Type (T1) = Base_Type (T2) then
4784 -- The following is too permissive. A more precise test should
4785 -- check that the generic actual is an ancestor subtype of the
4788 return not Is_Generic_Actual_Type (T1)
4789 or else not Is_Generic_Actual_Type (T2)
4790 or else Scope (T1) /= Scope (T2);
4795 end Base_Types_Match;
4797 --------------------------
4798 -- Find_Designated_Type --
4799 --------------------------
4801 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
4805 Desig := Directly_Designated_Type (T);
4807 if Ekind (Desig) = E_Incomplete_Type then
4809 -- If regular incomplete type, get full view if available
4811 if Present (Full_View (Desig)) then
4812 Desig := Full_View (Desig);
4814 -- If limited view of a type, get non-limited view if available,
4815 -- and check again for a regular incomplete type.
4817 elsif Present (Non_Limited_View (Desig)) then
4818 Desig := Get_Full_View (Non_Limited_View (Desig));
4823 end Find_Designated_Type;
4825 -------------------------------
4826 -- Matches_Limited_With_View --
4827 -------------------------------
4829 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
4831 -- In some cases a type imported through a limited_with clause, and
4832 -- its nonlimited view are both visible, for example in an anonymous
4833 -- access-to-class-wide type in a formal. Both entities designate the
4836 if From_With_Type (T1)
4837 and then T2 = Available_View (T1)
4841 elsif From_With_Type (T2)
4842 and then T1 = Available_View (T2)
4849 end Matches_Limited_With_View;
4851 -- Start of processing for Conforming_Types
4854 -- The context is an instance association for a formal
4855 -- access-to-subprogram type; the formal parameter types require
4856 -- mapping because they may denote other formal parameters of the
4860 Type_1 := Get_Instance_Of (T1);
4861 Type_2 := Get_Instance_Of (T2);
4864 -- If one of the types is a view of the other introduced by a limited
4865 -- with clause, treat these as conforming for all purposes.
4867 if Matches_Limited_With_View (T1, T2) then
4870 elsif Base_Types_Match (Type_1, Type_2) then
4871 return Ctype <= Mode_Conformant
4872 or else Subtypes_Statically_Match (Type_1, Type_2);
4874 elsif Is_Incomplete_Or_Private_Type (Type_1)
4875 and then Present (Full_View (Type_1))
4876 and then Base_Types_Match (Full_View (Type_1), Type_2)
4878 return Ctype <= Mode_Conformant
4879 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
4881 elsif Ekind (Type_2) = E_Incomplete_Type
4882 and then Present (Full_View (Type_2))
4883 and then Base_Types_Match (Type_1, Full_View (Type_2))
4885 return Ctype <= Mode_Conformant
4886 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4888 elsif Is_Private_Type (Type_2)
4889 and then In_Instance
4890 and then Present (Full_View (Type_2))
4891 and then Base_Types_Match (Type_1, Full_View (Type_2))
4893 return Ctype <= Mode_Conformant
4894 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4897 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
4898 -- treated recursively because they carry a signature.
4900 Are_Anonymous_Access_To_Subprogram_Types :=
4901 Ekind (Type_1) = Ekind (Type_2)
4903 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
4905 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
4907 -- Test anonymous access type case. For this case, static subtype
4908 -- matching is required for mode conformance (RM 6.3.1(15)). We check
4909 -- the base types because we may have built internal subtype entities
4910 -- to handle null-excluding types (see Process_Formals).
4912 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
4914 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
4915 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
4918 Desig_1 : Entity_Id;
4919 Desig_2 : Entity_Id;
4922 -- In Ada2005, access constant indicators must match for
4923 -- subtype conformance.
4925 if Ada_Version >= Ada_05
4926 and then Ctype >= Subtype_Conformant
4928 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
4933 Desig_1 := Find_Designated_Type (Type_1);
4935 Desig_2 := Find_Designated_Type (Type_2);
4937 -- If the context is an instance association for a formal
4938 -- access-to-subprogram type; formal access parameter designated
4939 -- types require mapping because they may denote other formal
4940 -- parameters of the generic unit.
4943 Desig_1 := Get_Instance_Of (Desig_1);
4944 Desig_2 := Get_Instance_Of (Desig_2);
4947 -- It is possible for a Class_Wide_Type to be introduced for an
4948 -- incomplete type, in which case there is a separate class_ wide
4949 -- type for the full view. The types conform if their Etypes
4950 -- conform, i.e. one may be the full view of the other. This can
4951 -- only happen in the context of an access parameter, other uses
4952 -- of an incomplete Class_Wide_Type are illegal.
4954 if Is_Class_Wide_Type (Desig_1)
4955 and then Is_Class_Wide_Type (Desig_2)
4959 (Etype (Base_Type (Desig_1)),
4960 Etype (Base_Type (Desig_2)), Ctype);
4962 elsif Are_Anonymous_Access_To_Subprogram_Types then
4963 if Ada_Version < Ada_05 then
4964 return Ctype = Type_Conformant
4966 Subtypes_Statically_Match (Desig_1, Desig_2);
4968 -- We must check the conformance of the signatures themselves
4972 Conformant : Boolean;
4975 (Desig_1, Desig_2, Ctype, False, Conformant);
4981 return Base_Type (Desig_1) = Base_Type (Desig_2)
4982 and then (Ctype = Type_Conformant
4984 Subtypes_Statically_Match (Desig_1, Desig_2));
4988 -- Otherwise definitely no match
4991 if ((Ekind (Type_1) = E_Anonymous_Access_Type
4992 and then Is_Access_Type (Type_2))
4993 or else (Ekind (Type_2) = E_Anonymous_Access_Type
4994 and then Is_Access_Type (Type_1)))
4997 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
4999 May_Hide_Profile := True;
5004 end Conforming_Types;
5006 --------------------------
5007 -- Create_Extra_Formals --
5008 --------------------------
5010 procedure Create_Extra_Formals (E : Entity_Id) is
5012 First_Extra : Entity_Id := Empty;
5013 Last_Extra : Entity_Id;
5014 Formal_Type : Entity_Id;
5015 P_Formal : Entity_Id := Empty;
5017 function Add_Extra_Formal
5018 (Assoc_Entity : Entity_Id;
5021 Suffix : String) return Entity_Id;
5022 -- Add an extra formal to the current list of formals and extra formals.
5023 -- The extra formal is added to the end of the list of extra formals,
5024 -- and also returned as the result. These formals are always of mode IN.
5025 -- The new formal has the type Typ, is declared in Scope, and its name
5026 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5028 ----------------------
5029 -- Add_Extra_Formal --
5030 ----------------------
5032 function Add_Extra_Formal
5033 (Assoc_Entity : Entity_Id;
5036 Suffix : String) return Entity_Id
5038 EF : constant Entity_Id :=
5039 Make_Defining_Identifier (Sloc (Assoc_Entity),
5040 Chars => New_External_Name (Chars (Assoc_Entity),
5044 -- A little optimization. Never generate an extra formal for the
5045 -- _init operand of an initialization procedure, since it could
5048 if Chars (Formal) = Name_uInit then
5052 Set_Ekind (EF, E_In_Parameter);
5053 Set_Actual_Subtype (EF, Typ);
5054 Set_Etype (EF, Typ);
5055 Set_Scope (EF, Scope);
5056 Set_Mechanism (EF, Default_Mechanism);
5057 Set_Formal_Validity (EF);
5059 if No (First_Extra) then
5061 Set_Extra_Formals (Scope, First_Extra);
5064 if Present (Last_Extra) then
5065 Set_Extra_Formal (Last_Extra, EF);
5071 end Add_Extra_Formal;
5073 -- Start of processing for Create_Extra_Formals
5076 -- We never generate extra formals if expansion is not active
5077 -- because we don't need them unless we are generating code.
5079 if not Expander_Active then
5083 -- If this is a derived subprogram then the subtypes of the parent
5084 -- subprogram's formal parameters will be used to to determine the need
5085 -- for extra formals.
5087 if Is_Overloadable (E) and then Present (Alias (E)) then
5088 P_Formal := First_Formal (Alias (E));
5091 Last_Extra := Empty;
5092 Formal := First_Formal (E);
5093 while Present (Formal) loop
5094 Last_Extra := Formal;
5095 Next_Formal (Formal);
5098 -- If Extra_formals were already created, don't do it again. This
5099 -- situation may arise for subprogram types created as part of
5100 -- dispatching calls (see Expand_Dispatching_Call)
5102 if Present (Last_Extra) and then
5103 Present (Extra_Formal (Last_Extra))
5108 -- If the subprogram is a predefined dispatching subprogram then don't
5109 -- generate any extra constrained or accessibility level formals. In
5110 -- general we suppress these for internal subprograms (by not calling
5111 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5112 -- generated stream attributes do get passed through because extra
5113 -- build-in-place formals are needed in some cases (limited 'Input
).
5115 if Is_Predefined_Dispatching_Operation
(E
) then
5116 goto Test_For_BIP_Extras
;
5119 Formal
:= First_Formal
(E
);
5120 while Present
(Formal
) loop
5122 -- Create extra formal for supporting the attribute 'Constrained.
5123 -- The case of a private type view without discriminants also
5124 -- requires the extra formal if the underlying type has defaulted
5127 if Ekind
(Formal
) /= E_In_Parameter
then
5128 if Present
(P_Formal
) then
5129 Formal_Type
:= Etype
(P_Formal
);
5131 Formal_Type
:= Etype
(Formal
);
5134 -- Do not produce extra formals for Unchecked_Union parameters.
5135 -- Jump directly to the end of the loop.
5137 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
5138 goto Skip_Extra_Formal_Generation
;
5141 if not Has_Discriminants
(Formal_Type
)
5142 and then Ekind
(Formal_Type
) in Private_Kind
5143 and then Present
(Underlying_Type
(Formal_Type
))
5145 Formal_Type
:= Underlying_Type
(Formal_Type
);
5148 if Has_Discriminants
(Formal_Type
)
5149 and then not Is_Constrained
(Formal_Type
)
5150 and then not Is_Indefinite_Subtype
(Formal_Type
)
5152 Set_Extra_Constrained
5153 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "F"));
5157 -- Create extra formal for supporting accessibility checking. This
5158 -- is done for both anonymous access formals and formals of named
5159 -- access types that are marked as controlling formals. The latter
5160 -- case can occur when Expand_Dispatching_Call creates a subprogram
5161 -- type and substitutes the types of access-to-class-wide actuals
5162 -- for the anonymous access-to-specific-type of controlling formals.
5163 -- Base_Type is applied because in cases where there is a null
5164 -- exclusion the formal may have an access subtype.
5166 -- This is suppressed if we specifically suppress accessibility
5167 -- checks at the package level for either the subprogram, or the
5168 -- package in which it resides. However, we do not suppress it
5169 -- simply if the scope has accessibility checks suppressed, since
5170 -- this could cause trouble when clients are compiled with a
5171 -- different suppression setting. The explicit checks at the
5172 -- package level are safe from this point of view.
5174 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
5175 or else (Is_Controlling_Formal
(Formal
)
5176 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
5178 (Explicit_Suppress
(E
, Accessibility_Check
)
5180 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
5183 or else Present
(Extra_Accessibility
(P_Formal
)))
5185 -- Temporary kludge: for now we avoid creating the extra formal
5186 -- for access parameters of protected operations because of
5187 -- problem with the case of internal protected calls. ???
5189 if Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Definition
5190 and then Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Body
5192 Set_Extra_Accessibility
5193 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "F"));
5197 -- This label is required when skipping extra formal generation for
5198 -- Unchecked_Union parameters.
5200 <<Skip_Extra_Formal_Generation
>>
5202 if Present
(P_Formal
) then
5203 Next_Formal
(P_Formal
);
5206 Next_Formal
(Formal
);
5209 <<Test_For_BIP_Extras
>>
5211 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5212 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5214 if Ada_Version
>= Ada_05
and then Is_Build_In_Place_Function
(E
) then
5216 Result_Subt
: constant Entity_Id
:= Etype
(E
);
5218 Discard
: Entity_Id
;
5219 pragma Warnings
(Off
, Discard
);
5222 -- In the case of functions with unconstrained result subtypes,
5223 -- add a 3-state formal indicating whether the return object is
5224 -- allocated by the caller (0), or should be allocated by the
5225 -- callee on the secondary stack (1) or in the global heap (2).
5226 -- For the moment we just use Natural for the type of this formal.
5227 -- Note that this formal isn't usually needed in the case where
5228 -- the result subtype is constrained, but it is needed when the
5229 -- function has a tagged result, because generally such functions
5230 -- can be called in a dispatching context and such calls must be
5231 -- handled like calls to a class-wide function.
5233 if not Is_Constrained
(Underlying_Type
(Result_Subt
))
5234 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5238 (E
, Standard_Natural
,
5239 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
5242 -- In the case of functions whose result type has controlled
5243 -- parts, we have an extra formal of type
5244 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5245 -- is, we are passing a pointer to a finalization list (which is
5246 -- itself a pointer). This extra formal is then passed along to
5247 -- Move_Final_List in case of successful completion of a return
5248 -- statement. We cannot pass an 'in out' parameter, because we
5249 -- need to update the finalization list during an abort-deferred
5250 -- region, rather than using copy-back after the function
5251 -- returns. This is true even if we are able to get away with
5252 -- having 'in out' parameters, which are normally illegal for
5253 -- functions. This formal is also needed when the function has
5254 -- a tagged result, because generally such functions can be called
5255 -- in a dispatching context and such calls must be handled like
5256 -- calls to class-wide functions.
5258 if Controlled_Type
(Result_Subt
)
5259 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5263 (E
, RTE
(RE_Finalizable_Ptr_Ptr
),
5264 E
, BIP_Formal_Suffix
(BIP_Final_List
));
5267 -- If the result type contains tasks, we have two extra formals:
5268 -- the master of the tasks to be created, and the caller's
5269 -- activation chain.
5271 if Has_Task
(Result_Subt
) then
5274 (E
, RTE
(RE_Master_Id
),
5275 E
, BIP_Formal_Suffix
(BIP_Master
));
5278 (E
, RTE
(RE_Activation_Chain_Access
),
5279 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
5282 -- All build-in-place functions get an extra formal that will be
5283 -- passed the address of the return object within the caller.
5286 Formal_Type
: constant Entity_Id
:=
5288 (E_Anonymous_Access_Type
, E
,
5289 Scope_Id
=> Scope
(E
));
5291 Set_Directly_Designated_Type
(Formal_Type
, Result_Subt
);
5292 Set_Etype
(Formal_Type
, Formal_Type
);
5293 Set_Depends_On_Private
5294 (Formal_Type
, Has_Private_Component
(Formal_Type
));
5295 Set_Is_Public
(Formal_Type
, Is_Public
(Scope
(Formal_Type
)));
5296 Set_Is_Access_Constant
(Formal_Type
, False);
5298 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5299 -- the designated type comes from the limited view (for
5300 -- back-end purposes).
5302 Set_From_With_Type
(Formal_Type
, From_With_Type
(Result_Subt
));
5304 Layout_Type
(Formal_Type
);
5308 (E
, Formal_Type
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
5312 end Create_Extra_Formals
;
5314 -----------------------------
5315 -- Enter_Overloaded_Entity --
5316 -----------------------------
5318 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
5319 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
5320 C_E
: Entity_Id
:= Current_Entity
(S
);
5324 Set_Has_Homonym
(E
);
5325 Set_Has_Homonym
(S
);
5328 Set_Is_Immediately_Visible
(S
);
5329 Set_Scope
(S
, Current_Scope
);
5331 -- Chain new entity if front of homonym in current scope, so that
5332 -- homonyms are contiguous.
5337 while Homonym
(C_E
) /= E
loop
5338 C_E
:= Homonym
(C_E
);
5341 Set_Homonym
(C_E
, S
);
5345 Set_Current_Entity
(S
);
5350 Append_Entity
(S
, Current_Scope
);
5351 Set_Public_Status
(S
);
5353 if Debug_Flag_E
then
5354 Write_Str
("New overloaded entity chain: ");
5355 Write_Name
(Chars
(S
));
5358 while Present
(E
) loop
5359 Write_Str
(" "); Write_Int
(Int
(E
));
5366 -- Generate warning for hiding
5369 and then Comes_From_Source
(S
)
5370 and then In_Extended_Main_Source_Unit
(S
)
5377 -- Warn unless genuine overloading
5379 if (not Is_Overloadable
(E
) or else Subtype_Conformant
(E
, S
))
5380 and then (Is_Immediately_Visible
(E
)
5382 Is_Potentially_Use_Visible
(S
))
5384 Error_Msg_Sloc
:= Sloc
(E
);
5385 Error_Msg_N
("declaration of & hides one#?", S
);
5389 end Enter_Overloaded_Entity
;
5391 -----------------------------
5392 -- Find_Corresponding_Spec --
5393 -----------------------------
5395 function Find_Corresponding_Spec
5397 Post_Error
: Boolean := True) return Entity_Id
5399 Spec
: constant Node_Id
:= Specification
(N
);
5400 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
5405 E
:= Current_Entity
(Designator
);
5406 while Present
(E
) loop
5408 -- We are looking for a matching spec. It must have the same scope,
5409 -- and the same name, and either be type conformant, or be the case
5410 -- of a library procedure spec and its body (which belong to one
5411 -- another regardless of whether they are type conformant or not).
5413 if Scope
(E
) = Current_Scope
then
5414 if Current_Scope
= Standard_Standard
5415 or else (Ekind
(E
) = Ekind
(Designator
)
5416 and then Type_Conformant
(E
, Designator
))
5418 -- Within an instantiation, we know that spec and body are
5419 -- subtype conformant, because they were subtype conformant
5420 -- in the generic. We choose the subtype-conformant entity
5421 -- here as well, to resolve spurious ambiguities in the
5422 -- instance that were not present in the generic (i.e. when
5423 -- two different types are given the same actual). If we are
5424 -- looking for a spec to match a body, full conformance is
5428 Set_Convention
(Designator
, Convention
(E
));
5430 if Nkind
(N
) = N_Subprogram_Body
5431 and then Present
(Homonym
(E
))
5432 and then not Fully_Conformant
(E
, Designator
)
5436 elsif not Subtype_Conformant
(E
, Designator
) then
5441 if not Has_Completion
(E
) then
5442 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
5443 Set_Corresponding_Spec
(N
, E
);
5446 Set_Has_Completion
(E
);
5449 elsif Nkind
(Parent
(N
)) = N_Subunit
then
5451 -- If this is the proper body of a subunit, the completion
5452 -- flag is set when analyzing the stub.
5456 -- If E is an internal function with a controlling result
5457 -- that was created for an operation inherited by a null
5458 -- extension, it may be overridden by a body without a previous
5459 -- spec (one more reason why these should be shunned). In that
5460 -- case remove the generated body, because the current one is
5461 -- the explicit overriding.
5463 elsif Ekind
(E
) = E_Function
5464 and then Ada_Version
>= Ada_05
5465 and then not Comes_From_Source
(E
)
5466 and then Has_Controlling_Result
(E
)
5467 and then Is_Null_Extension
(Etype
(E
))
5468 and then Comes_From_Source
(Spec
)
5470 Set_Has_Completion
(E
, False);
5472 if Expander_Active
then
5474 (Unit_Declaration_Node
5475 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
5478 -- If expansion is disabled, the wrapper function has not
5479 -- been generated, and this is the standard case of a late
5480 -- body overriding an inherited operation.
5486 -- If the body already exists, then this is an error unless
5487 -- the previous declaration is the implicit declaration of a
5488 -- derived subprogram, or this is a spurious overloading in an
5491 elsif No
(Alias
(E
))
5492 and then not Is_Intrinsic_Subprogram
(E
)
5493 and then not In_Instance
5496 Error_Msg_Sloc
:= Sloc
(E
);
5497 if Is_Imported
(E
) then
5499 ("body not allowed for imported subprogram & declared#",
5502 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
5506 -- Child units cannot be overloaded, so a conformance mismatch
5507 -- between body and a previous spec is an error.
5509 elsif Is_Child_Unit
(E
)
5511 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
5513 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
5518 ("body of child unit does not match previous declaration", N
);
5526 -- On exit, we know that no previous declaration of subprogram exists
5529 end Find_Corresponding_Spec
;
5531 ----------------------
5532 -- Fully_Conformant --
5533 ----------------------
5535 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
5538 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
5540 end Fully_Conformant
;
5542 ----------------------------------
5543 -- Fully_Conformant_Expressions --
5544 ----------------------------------
5546 function Fully_Conformant_Expressions
5547 (Given_E1
: Node_Id
;
5548 Given_E2
: Node_Id
) return Boolean
5550 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
5551 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
5552 -- We always test conformance on original nodes, since it is possible
5553 -- for analysis and/or expansion to make things look as though they
5554 -- conform when they do not, e.g. by converting 1+2 into 3.
5556 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
5557 renames Fully_Conformant_Expressions
;
5559 function FCL
(L1
, L2
: List_Id
) return Boolean;
5560 -- Compare elements of two lists for conformance. Elements have to
5561 -- be conformant, and actuals inserted as default parameters do not
5562 -- match explicit actuals with the same value.
5564 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
5565 -- Compare an operator node with a function call
5571 function FCL
(L1
, L2
: List_Id
) return Boolean is
5575 if L1
= No_List
then
5581 if L2
= No_List
then
5587 -- Compare two lists, skipping rewrite insertions (we want to
5588 -- compare the original trees, not the expanded versions!)
5591 if Is_Rewrite_Insertion
(N1
) then
5593 elsif Is_Rewrite_Insertion
(N2
) then
5599 elsif not FCE
(N1
, N2
) then
5612 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
5613 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
5618 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
5623 Act
:= First
(Actuals
);
5625 if Nkind
(Op_Node
) in N_Binary_Op
then
5627 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
5634 return Present
(Act
)
5635 and then FCE
(Right_Opnd
(Op_Node
), Act
)
5636 and then No
(Next
(Act
));
5640 -- Start of processing for Fully_Conformant_Expressions
5643 -- Non-conformant if paren count does not match. Note: if some idiot
5644 -- complains that we don't do this right for more than 3 levels of
5645 -- parentheses, they will be treated with the respect they deserve!
5647 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
5650 -- If same entities are referenced, then they are conformant even if
5651 -- they have different forms (RM 8.3.1(19-20)).
5653 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
5654 if Present
(Entity
(E1
)) then
5655 return Entity
(E1
) = Entity
(E2
)
5656 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
5657 and then Ekind
(Entity
(E1
)) = E_Discriminant
5658 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
5660 elsif Nkind
(E1
) = N_Expanded_Name
5661 and then Nkind
(E2
) = N_Expanded_Name
5662 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5663 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5665 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
5668 -- Identifiers in component associations don't always have
5669 -- entities, but their names must conform.
5671 return Nkind
(E1
) = N_Identifier
5672 and then Nkind
(E2
) = N_Identifier
5673 and then Chars
(E1
) = Chars
(E2
);
5676 elsif Nkind
(E1
) = N_Character_Literal
5677 and then Nkind
(E2
) = N_Expanded_Name
5679 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5680 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
5682 elsif Nkind
(E2
) = N_Character_Literal
5683 and then Nkind
(E1
) = N_Expanded_Name
5685 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5686 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
5688 elsif Nkind
(E1
) in N_Op
5689 and then Nkind
(E2
) = N_Function_Call
5691 return FCO
(E1
, E2
);
5693 elsif Nkind
(E2
) in N_Op
5694 and then Nkind
(E1
) = N_Function_Call
5696 return FCO
(E2
, E1
);
5698 -- Otherwise we must have the same syntactic entity
5700 elsif Nkind
(E1
) /= Nkind
(E2
) then
5703 -- At this point, we specialize by node type
5710 FCL
(Expressions
(E1
), Expressions
(E2
))
5711 and then FCL
(Component_Associations
(E1
),
5712 Component_Associations
(E2
));
5715 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
5717 Nkind
(Expression
(E2
)) = N_Qualified_Expression
5719 return FCE
(Expression
(E1
), Expression
(E2
));
5721 -- Check that the subtype marks and any constraints
5726 Indic1
: constant Node_Id
:= Expression
(E1
);
5727 Indic2
: constant Node_Id
:= Expression
(E2
);
5732 if Nkind
(Indic1
) /= N_Subtype_Indication
then
5734 Nkind
(Indic2
) /= N_Subtype_Indication
5735 and then Entity
(Indic1
) = Entity
(Indic2
);
5737 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
5739 Nkind
(Indic1
) /= N_Subtype_Indication
5740 and then Entity
(Indic1
) = Entity
(Indic2
);
5743 if Entity
(Subtype_Mark
(Indic1
)) /=
5744 Entity
(Subtype_Mark
(Indic2
))
5749 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
5750 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
5752 while Present
(Elt1
) and then Present
(Elt2
) loop
5753 if not FCE
(Elt1
, Elt2
) then
5766 when N_Attribute_Reference
=>
5768 Attribute_Name
(E1
) = Attribute_Name
(E2
)
5769 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5773 Entity
(E1
) = Entity
(E2
)
5774 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5775 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5777 when N_And_Then | N_Or_Else | N_Membership_Test
=>
5779 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5781 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5783 when N_Character_Literal
=>
5785 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
5787 when N_Component_Association
=>
5789 FCL
(Choices
(E1
), Choices
(E2
))
5790 and then FCE
(Expression
(E1
), Expression
(E2
));
5792 when N_Conditional_Expression
=>
5794 FCL
(Expressions
(E1
), Expressions
(E2
));
5796 when N_Explicit_Dereference
=>
5798 FCE
(Prefix
(E1
), Prefix
(E2
));
5800 when N_Extension_Aggregate
=>
5802 FCL
(Expressions
(E1
), Expressions
(E2
))
5803 and then Null_Record_Present
(E1
) =
5804 Null_Record_Present
(E2
)
5805 and then FCL
(Component_Associations
(E1
),
5806 Component_Associations
(E2
));
5808 when N_Function_Call
=>
5810 FCE
(Name
(E1
), Name
(E2
))
5811 and then FCL
(Parameter_Associations
(E1
),
5812 Parameter_Associations
(E2
));
5814 when N_Indexed_Component
=>
5816 FCE
(Prefix
(E1
), Prefix
(E2
))
5817 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5819 when N_Integer_Literal
=>
5820 return (Intval
(E1
) = Intval
(E2
));
5825 when N_Operator_Symbol
=>
5827 Chars
(E1
) = Chars
(E2
);
5829 when N_Others_Choice
=>
5832 when N_Parameter_Association
=>
5834 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
5835 and then FCE
(Explicit_Actual_Parameter
(E1
),
5836 Explicit_Actual_Parameter
(E2
));
5838 when N_Qualified_Expression
=>
5840 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5841 and then FCE
(Expression
(E1
), Expression
(E2
));
5845 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
5846 and then FCE
(High_Bound
(E1
), High_Bound
(E2
));
5848 when N_Real_Literal
=>
5849 return (Realval
(E1
) = Realval
(E2
));
5851 when N_Selected_Component
=>
5853 FCE
(Prefix
(E1
), Prefix
(E2
))
5854 and then FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
5858 FCE
(Prefix
(E1
), Prefix
(E2
))
5859 and then FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
5861 when N_String_Literal
=>
5863 S1
: constant String_Id
:= Strval
(E1
);
5864 S2
: constant String_Id
:= Strval
(E2
);
5865 L1
: constant Nat
:= String_Length
(S1
);
5866 L2
: constant Nat
:= String_Length
(S2
);
5873 for J
in 1 .. L1
loop
5874 if Get_String_Char
(S1
, J
) /=
5875 Get_String_Char
(S2
, J
)
5885 when N_Type_Conversion
=>
5887 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5888 and then FCE
(Expression
(E1
), Expression
(E2
));
5892 Entity
(E1
) = Entity
(E2
)
5893 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5895 when N_Unchecked_Type_Conversion
=>
5897 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5898 and then FCE
(Expression
(E1
), Expression
(E2
));
5900 -- All other node types cannot appear in this context. Strictly
5901 -- we should raise a fatal internal error. Instead we just ignore
5902 -- the nodes. This means that if anyone makes a mistake in the
5903 -- expander and mucks an expression tree irretrievably, the
5904 -- result will be a failure to detect a (probably very obscure)
5905 -- case of non-conformance, which is better than bombing on some
5906 -- case where two expressions do in fact conform.
5913 end Fully_Conformant_Expressions
;
5915 ----------------------------------------
5916 -- Fully_Conformant_Discrete_Subtypes --
5917 ----------------------------------------
5919 function Fully_Conformant_Discrete_Subtypes
5920 (Given_S1
: Node_Id
;
5921 Given_S2
: Node_Id
) return Boolean
5923 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
5924 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
5926 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
5927 -- Special-case for a bound given by a discriminant, which in the body
5928 -- is replaced with the discriminal of the enclosing type.
5930 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
5931 -- Check both bounds
5933 -----------------------
5934 -- Conforming_Bounds --
5935 -----------------------
5937 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
5939 if Is_Entity_Name
(B1
)
5940 and then Is_Entity_Name
(B2
)
5941 and then Ekind
(Entity
(B1
)) = E_Discriminant
5943 return Chars
(B1
) = Chars
(B2
);
5946 return Fully_Conformant_Expressions
(B1
, B2
);
5948 end Conforming_Bounds
;
5950 -----------------------
5951 -- Conforming_Ranges --
5952 -----------------------
5954 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
5957 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
5959 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
5960 end Conforming_Ranges
;
5962 -- Start of processing for Fully_Conformant_Discrete_Subtypes
5965 if Nkind
(S1
) /= Nkind
(S2
) then
5968 elsif Is_Entity_Name
(S1
) then
5969 return Entity
(S1
) = Entity
(S2
);
5971 elsif Nkind
(S1
) = N_Range
then
5972 return Conforming_Ranges
(S1
, S2
);
5974 elsif Nkind
(S1
) = N_Subtype_Indication
then
5976 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
5979 (Range_Expression
(Constraint
(S1
)),
5980 Range_Expression
(Constraint
(S2
)));
5984 end Fully_Conformant_Discrete_Subtypes
;
5986 --------------------
5987 -- Install_Entity --
5988 --------------------
5990 procedure Install_Entity
(E
: Entity_Id
) is
5991 Prev
: constant Entity_Id
:= Current_Entity
(E
);
5993 Set_Is_Immediately_Visible
(E
);
5994 Set_Current_Entity
(E
);
5995 Set_Homonym
(E
, Prev
);
5998 ---------------------
5999 -- Install_Formals --
6000 ---------------------
6002 procedure Install_Formals
(Id
: Entity_Id
) is
6005 F
:= First_Formal
(Id
);
6006 while Present
(F
) loop
6010 end Install_Formals
;
6012 -----------------------------
6013 -- Is_Interface_Conformant --
6014 -----------------------------
6016 function Is_Interface_Conformant
6017 (Tagged_Type
: Entity_Id
;
6018 Iface_Prim
: Entity_Id
;
6019 Prim
: Entity_Id
) return Boolean
6021 Iface
: constant Entity_Id
:= Find_Dispatching_Type
(Iface_Prim
);
6022 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
6025 pragma Assert
(Is_Subprogram
(Iface_Prim
)
6026 and then Is_Subprogram
(Prim
)
6027 and then Is_Dispatching_Operation
(Iface_Prim
)
6028 and then Is_Dispatching_Operation
(Prim
));
6030 pragma Assert
(Is_Interface
(Iface
)
6031 or else (Present
(Alias
(Iface_Prim
))
6034 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
6036 if Prim
= Iface_Prim
6037 or else not Is_Subprogram
(Prim
)
6038 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
6039 or else not Is_Dispatching_Operation
(Prim
)
6040 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
6042 or else Base_Type
(Typ
) /= Tagged_Type
6043 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
6047 -- Case of a procedure, or a function that does not have a controlling
6048 -- result (I or access I).
6050 elsif Ekind
(Iface_Prim
) = E_Procedure
6051 or else Etype
(Prim
) = Etype
(Iface_Prim
)
6052 or else not Has_Controlling_Result
(Prim
)
6054 return Type_Conformant
(Prim
, Iface_Prim
,
6055 Skip_Controlling_Formals
=> True);
6057 -- Case of a function returning an interface, or an access to one.
6058 -- Check that the return types correspond.
6060 elsif Implements_Interface
(Typ
, Iface
) then
6061 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
6063 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
6068 Type_Conformant
(Prim
, Iface_Prim
,
6069 Skip_Controlling_Formals
=> True);
6075 end Is_Interface_Conformant
;
6077 ---------------------------------
6078 -- Is_Non_Overriding_Operation --
6079 ---------------------------------
6081 function Is_Non_Overriding_Operation
6082 (Prev_E
: Entity_Id
;
6083 New_E
: Entity_Id
) return Boolean
6087 G_Typ
: Entity_Id
:= Empty
;
6089 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
6090 -- If F_Type is a derived type associated with a generic actual subtype,
6091 -- then return its Generic_Parent_Type attribute, else return Empty.
6093 function Types_Correspond
6094 (P_Type
: Entity_Id
;
6095 N_Type
: Entity_Id
) return Boolean;
6096 -- Returns true if and only if the types (or designated types in the
6097 -- case of anonymous access types) are the same or N_Type is derived
6098 -- directly or indirectly from P_Type.
6100 -----------------------------
6101 -- Get_Generic_Parent_Type --
6102 -----------------------------
6104 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
6109 if Is_Derived_Type
(F_Typ
)
6110 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
6112 -- The tree must be traversed to determine the parent subtype in
6113 -- the generic unit, which unfortunately isn't always available
6114 -- via semantic attributes. ??? (Note: The use of Original_Node
6115 -- is needed for cases where a full derived type has been
6118 Indic
:= Subtype_Indication
6119 (Type_Definition
(Original_Node
(Parent
(F_Typ
))));
6121 if Nkind
(Indic
) = N_Subtype_Indication
then
6122 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
6124 G_Typ
:= Entity
(Indic
);
6127 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
6128 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
6130 return Generic_Parent_Type
(Parent
(G_Typ
));
6135 end Get_Generic_Parent_Type
;
6137 ----------------------
6138 -- Types_Correspond --
6139 ----------------------
6141 function Types_Correspond
6142 (P_Type
: Entity_Id
;
6143 N_Type
: Entity_Id
) return Boolean
6145 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
6146 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
6149 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
6150 Prev_Type
:= Designated_Type
(Prev_Type
);
6153 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
6154 New_Type
:= Designated_Type
(New_Type
);
6157 if Prev_Type
= New_Type
then
6160 elsif not Is_Class_Wide_Type
(New_Type
) then
6161 while Etype
(New_Type
) /= New_Type
loop
6162 New_Type
:= Etype
(New_Type
);
6163 if New_Type
= Prev_Type
then
6169 end Types_Correspond
;
6171 -- Start of processing for Is_Non_Overriding_Operation
6174 -- In the case where both operations are implicit derived subprograms
6175 -- then neither overrides the other. This can only occur in certain
6176 -- obscure cases (e.g., derivation from homographs created in a generic
6179 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
6182 elsif Ekind
(Current_Scope
) = E_Package
6183 and then Is_Generic_Instance
(Current_Scope
)
6184 and then In_Private_Part
(Current_Scope
)
6185 and then Comes_From_Source
(New_E
)
6187 -- We examine the formals and result subtype of the inherited
6188 -- operation, to determine whether their type is derived from (the
6189 -- instance of) a generic type.
6191 Formal
:= First_Formal
(Prev_E
);
6193 while Present
(Formal
) loop
6194 F_Typ
:= Base_Type
(Etype
(Formal
));
6196 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
6197 F_Typ
:= Designated_Type
(F_Typ
);
6200 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
6202 Next_Formal
(Formal
);
6205 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
6206 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
6213 -- If the generic type is a private type, then the original
6214 -- operation was not overriding in the generic, because there was
6215 -- no primitive operation to override.
6217 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
6218 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
6219 N_Formal_Private_Type_Definition
6223 -- The generic parent type is the ancestor of a formal derived
6224 -- type declaration. We need to check whether it has a primitive
6225 -- operation that should be overridden by New_E in the generic.
6229 P_Formal
: Entity_Id
;
6230 N_Formal
: Entity_Id
;
6234 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
6237 while Present
(Prim_Elt
) loop
6238 P_Prim
:= Node
(Prim_Elt
);
6240 if Chars
(P_Prim
) = Chars
(New_E
)
6241 and then Ekind
(P_Prim
) = Ekind
(New_E
)
6243 P_Formal
:= First_Formal
(P_Prim
);
6244 N_Formal
:= First_Formal
(New_E
);
6245 while Present
(P_Formal
) and then Present
(N_Formal
) loop
6246 P_Typ
:= Etype
(P_Formal
);
6247 N_Typ
:= Etype
(N_Formal
);
6249 if not Types_Correspond
(P_Typ
, N_Typ
) then
6253 Next_Entity
(P_Formal
);
6254 Next_Entity
(N_Formal
);
6257 -- Found a matching primitive operation belonging to the
6258 -- formal ancestor type, so the new subprogram is
6262 and then No
(N_Formal
)
6263 and then (Ekind
(New_E
) /= E_Function
6266 (Etype
(P_Prim
), Etype
(New_E
)))
6272 Next_Elmt
(Prim_Elt
);
6275 -- If no match found, then the new subprogram does not
6276 -- override in the generic (nor in the instance).
6284 end Is_Non_Overriding_Operation
;
6286 ------------------------------
6287 -- Make_Inequality_Operator --
6288 ------------------------------
6290 -- S is the defining identifier of an equality operator. We build a
6291 -- subprogram declaration with the right signature. This operation is
6292 -- intrinsic, because it is always expanded as the negation of the
6293 -- call to the equality function.
6295 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
6296 Loc
: constant Source_Ptr
:= Sloc
(S
);
6299 Op_Name
: Entity_Id
;
6301 FF
: constant Entity_Id
:= First_Formal
(S
);
6302 NF
: constant Entity_Id
:= Next_Formal
(FF
);
6305 -- Check that equality was properly defined, ignore call if not
6312 A
: constant Entity_Id
:=
6313 Make_Defining_Identifier
(Sloc
(FF
),
6314 Chars
=> Chars
(FF
));
6316 B
: constant Entity_Id
:=
6317 Make_Defining_Identifier
(Sloc
(NF
),
6318 Chars
=> Chars
(NF
));
6321 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
6323 Formals
:= New_List
(
6324 Make_Parameter_Specification
(Loc
,
6325 Defining_Identifier
=> A
,
6327 New_Reference_To
(Etype
(First_Formal
(S
)),
6328 Sloc
(Etype
(First_Formal
(S
))))),
6330 Make_Parameter_Specification
(Loc
,
6331 Defining_Identifier
=> B
,
6333 New_Reference_To
(Etype
(Next_Formal
(First_Formal
(S
))),
6334 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
6337 Make_Subprogram_Declaration
(Loc
,
6339 Make_Function_Specification
(Loc
,
6340 Defining_Unit_Name
=> Op_Name
,
6341 Parameter_Specifications
=> Formals
,
6342 Result_Definition
=>
6343 New_Reference_To
(Standard_Boolean
, Loc
)));
6345 -- Insert inequality right after equality if it is explicit or after
6346 -- the derived type when implicit. These entities are created only
6347 -- for visibility purposes, and eventually replaced in the course of
6348 -- expansion, so they do not need to be attached to the tree and seen
6349 -- by the back-end. Keeping them internal also avoids spurious
6350 -- freezing problems. The declaration is inserted in the tree for
6351 -- analysis, and removed afterwards. If the equality operator comes
6352 -- from an explicit declaration, attach the inequality immediately
6353 -- after. Else the equality is inherited from a derived type
6354 -- declaration, so insert inequality after that declaration.
6356 if No
(Alias
(S
)) then
6357 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
6358 elsif Is_List_Member
(Parent
(S
)) then
6359 Insert_After
(Parent
(S
), Decl
);
6361 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
6364 Mark_Rewrite_Insertion
(Decl
);
6365 Set_Is_Intrinsic_Subprogram
(Op_Name
);
6368 Set_Has_Completion
(Op_Name
);
6369 Set_Corresponding_Equality
(Op_Name
, S
);
6370 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
6372 end Make_Inequality_Operator
;
6374 ----------------------
6375 -- May_Need_Actuals --
6376 ----------------------
6378 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
6383 F
:= First_Formal
(Fun
);
6385 while Present
(F
) loop
6386 if No
(Default_Value
(F
)) then
6394 Set_Needs_No_Actuals
(Fun
, B
);
6395 end May_Need_Actuals
;
6397 ---------------------
6398 -- Mode_Conformant --
6399 ---------------------
6401 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
6404 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
6406 end Mode_Conformant
;
6408 ---------------------------
6409 -- New_Overloaded_Entity --
6410 ---------------------------
6412 procedure New_Overloaded_Entity
6414 Derived_Type
: Entity_Id
:= Empty
)
6416 Overridden_Subp
: Entity_Id
:= Empty
;
6417 -- Set if the current scope has an operation that is type-conformant
6418 -- with S, and becomes hidden by S.
6420 Is_Primitive_Subp
: Boolean;
6421 -- Set to True if the new subprogram is primitive
6424 -- Entity that S overrides
6426 Prev_Vis
: Entity_Id
:= Empty
;
6427 -- Predecessor of E in Homonym chain
6429 procedure Check_For_Primitive_Subprogram
6430 (Is_Primitive
: out Boolean;
6431 Is_Overriding
: Boolean := False);
6432 -- If the subprogram being analyzed is a primitive operation of the type
6433 -- of a formal or result, set the Has_Primitive_Operations flag on the
6434 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6435 -- corresponding flag on the entity itself for later use.
6437 procedure Check_Synchronized_Overriding
6438 (Def_Id
: Entity_Id
;
6439 Overridden_Subp
: out Entity_Id
);
6440 -- First determine if Def_Id is an entry or a subprogram either defined
6441 -- in the scope of a task or protected type, or is a primitive of such
6442 -- a type. Check whether Def_Id overrides a subprogram of an interface
6443 -- implemented by the synchronized type, return the overridden entity
6446 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
6447 -- Check that E is declared in the private part of the current package,
6448 -- or in the package body, where it may hide a previous declaration.
6449 -- We can't use In_Private_Part by itself because this flag is also
6450 -- set when freezing entities, so we must examine the place of the
6451 -- declaration in the tree, and recognize wrapper packages as well.
6453 ------------------------------------
6454 -- Check_For_Primitive_Subprogram --
6455 ------------------------------------
6457 procedure Check_For_Primitive_Subprogram
6458 (Is_Primitive
: out Boolean;
6459 Is_Overriding
: Boolean := False)
6465 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
6466 -- Returns true if T is declared in the visible part of
6467 -- the current package scope; otherwise returns false.
6468 -- Assumes that T is declared in a package.
6470 procedure Check_Private_Overriding
(T
: Entity_Id
);
6471 -- Checks that if a primitive abstract subprogram of a visible
6472 -- abstract type is declared in a private part, then it must
6473 -- override an abstract subprogram declared in the visible part.
6474 -- Also checks that if a primitive function with a controlling
6475 -- result is declared in a private part, then it must override
6476 -- a function declared in the visible part.
6478 ------------------------------
6479 -- Check_Private_Overriding --
6480 ------------------------------
6482 procedure Check_Private_Overriding
(T
: Entity_Id
) is
6484 if Ekind
(Current_Scope
) = E_Package
6485 and then In_Private_Part
(Current_Scope
)
6486 and then Visible_Part_Type
(T
)
6487 and then not In_Instance
6489 if Is_Abstract_Type
(T
)
6490 and then Is_Abstract_Subprogram
(S
)
6491 and then (not Is_Overriding
6492 or else not Is_Abstract_Subprogram
(E
))
6494 Error_Msg_N
("abstract subprograms must be visible "
6495 & "(RM 3.9.3(10))!", S
);
6497 elsif Ekind
(S
) = E_Function
6498 and then Is_Tagged_Type
(T
)
6499 and then T
= Base_Type
(Etype
(S
))
6500 and then not Is_Overriding
6503 ("private function with tagged result must"
6504 & " override visible-part function", S
);
6506 ("\move subprogram to the visible part"
6507 & " (RM 3.9.3(10))", S
);
6510 end Check_Private_Overriding
;
6512 -----------------------
6513 -- Visible_Part_Type --
6514 -----------------------
6516 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
6517 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
6521 -- If the entity is a private type, then it must be
6522 -- declared in a visible part.
6524 if Ekind
(T
) in Private_Kind
then
6528 -- Otherwise, we traverse the visible part looking for its
6529 -- corresponding declaration. We cannot use the declaration
6530 -- node directly because in the private part the entity of a
6531 -- private type is the one in the full view, which does not
6532 -- indicate that it is the completion of something visible.
6534 N
:= First
(Visible_Declarations
(Specification
(P
)));
6535 while Present
(N
) loop
6536 if Nkind
(N
) = N_Full_Type_Declaration
6537 and then Present
(Defining_Identifier
(N
))
6538 and then T
= Defining_Identifier
(N
)
6542 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
6543 N_Private_Extension_Declaration
)
6544 and then Present
(Defining_Identifier
(N
))
6545 and then T
= Full_View
(Defining_Identifier
(N
))
6554 end Visible_Part_Type
;
6556 -- Start of processing for Check_For_Primitive_Subprogram
6559 Is_Primitive
:= False;
6561 if not Comes_From_Source
(S
) then
6564 -- If subprogram is at library level, it is not primitive operation
6566 elsif Current_Scope
= Standard_Standard
then
6569 elsif ((Ekind
(Current_Scope
) = E_Package
6570 or else Ekind
(Current_Scope
) = E_Generic_Package
)
6571 and then not In_Package_Body
(Current_Scope
))
6572 or else Is_Overriding
6574 -- For function, check return type
6576 if Ekind
(S
) = E_Function
then
6577 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
6578 F_Typ
:= Designated_Type
(Etype
(S
));
6583 B_Typ
:= Base_Type
(F_Typ
);
6585 if Scope
(B_Typ
) = Current_Scope
6586 and then not Is_Class_Wide_Type
(B_Typ
)
6587 and then not Is_Generic_Type
(B_Typ
)
6589 Is_Primitive
:= True;
6590 Set_Has_Primitive_Operations
(B_Typ
);
6591 Set_Is_Primitive
(S
);
6592 Check_Private_Overriding
(B_Typ
);
6596 -- For all subprograms, check formals
6598 Formal
:= First_Formal
(S
);
6599 while Present
(Formal
) loop
6600 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
6601 F_Typ
:= Designated_Type
(Etype
(Formal
));
6603 F_Typ
:= Etype
(Formal
);
6606 B_Typ
:= Base_Type
(F_Typ
);
6608 if Ekind
(B_Typ
) = E_Access_Subtype
then
6609 B_Typ
:= Base_Type
(B_Typ
);
6612 if Scope
(B_Typ
) = Current_Scope
6613 and then not Is_Class_Wide_Type
(B_Typ
)
6614 and then not Is_Generic_Type
(B_Typ
)
6616 Is_Primitive
:= True;
6617 Set_Is_Primitive
(S
);
6618 Set_Has_Primitive_Operations
(B_Typ
);
6619 Check_Private_Overriding
(B_Typ
);
6622 Next_Formal
(Formal
);
6625 end Check_For_Primitive_Subprogram
;
6627 -----------------------------------
6628 -- Check_Synchronized_Overriding --
6629 -----------------------------------
6631 procedure Check_Synchronized_Overriding
6632 (Def_Id
: Entity_Id
;
6633 Overridden_Subp
: out Entity_Id
)
6635 Ifaces_List
: Elist_Id
;
6639 function Matches_Prefixed_View_Profile
6640 (Prim_Params
: List_Id
;
6641 Iface_Params
: List_Id
) return Boolean;
6642 -- Determine whether a subprogram's parameter profile Prim_Params
6643 -- matches that of a potentially overridden interface subprogram
6644 -- Iface_Params. Also determine if the type of first parameter of
6645 -- Iface_Params is an implemented interface.
6647 -----------------------------------
6648 -- Matches_Prefixed_View_Profile --
6649 -----------------------------------
6651 function Matches_Prefixed_View_Profile
6652 (Prim_Params
: List_Id
;
6653 Iface_Params
: List_Id
) return Boolean
6655 Iface_Id
: Entity_Id
;
6656 Iface_Param
: Node_Id
;
6657 Iface_Typ
: Entity_Id
;
6658 Prim_Id
: Entity_Id
;
6659 Prim_Param
: Node_Id
;
6660 Prim_Typ
: Entity_Id
;
6662 function Is_Implemented
6663 (Ifaces_List
: Elist_Id
;
6664 Iface
: Entity_Id
) return Boolean;
6665 -- Determine if Iface is implemented by the current task or
6668 --------------------
6669 -- Is_Implemented --
6670 --------------------
6672 function Is_Implemented
6673 (Ifaces_List
: Elist_Id
;
6674 Iface
: Entity_Id
) return Boolean
6676 Iface_Elmt
: Elmt_Id
;
6679 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
6680 while Present
(Iface_Elmt
) loop
6681 if Node
(Iface_Elmt
) = Iface
then
6685 Next_Elmt
(Iface_Elmt
);
6691 -- Start of processing for Matches_Prefixed_View_Profile
6694 Iface_Param
:= First
(Iface_Params
);
6695 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
6697 if Is_Access_Type
(Iface_Typ
) then
6698 Iface_Typ
:= Designated_Type
(Iface_Typ
);
6701 Prim_Param
:= First
(Prim_Params
);
6703 -- The first parameter of the potentially overridden subprogram
6704 -- must be an interface implemented by Prim.
6706 if not Is_Interface
(Iface_Typ
)
6707 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
6712 -- The checks on the object parameters are done, move onto the
6713 -- rest of the parameters.
6715 if not In_Scope
then
6716 Prim_Param
:= Next
(Prim_Param
);
6719 Iface_Param
:= Next
(Iface_Param
);
6720 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
6721 Iface_Id
:= Defining_Identifier
(Iface_Param
);
6722 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
6724 Prim_Id
:= Defining_Identifier
(Prim_Param
);
6725 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
6727 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
6728 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
6729 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
6731 Iface_Typ
:= Designated_Type
(Iface_Typ
);
6732 Prim_Typ
:= Designated_Type
(Prim_Typ
);
6735 -- Case of multiple interface types inside a parameter profile
6737 -- (Obj_Param : in out Iface; ...; Param : Iface)
6739 -- If the interface type is implemented, then the matching type
6740 -- in the primitive should be the implementing record type.
6742 if Ekind
(Iface_Typ
) = E_Record_Type
6743 and then Is_Interface
(Iface_Typ
)
6744 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
6746 if Prim_Typ
/= Typ
then
6750 -- The two parameters must be both mode and subtype conformant
6752 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
6754 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
6763 -- One of the two lists contains more parameters than the other
6765 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
6770 end Matches_Prefixed_View_Profile
;
6772 -- Start of processing for Check_Synchronized_Overriding
6775 Overridden_Subp
:= Empty
;
6777 -- Def_Id must be an entry or a subprogram. We should skip predefined
6778 -- primitives internally generated by the frontend; however at this
6779 -- stage predefined primitives are still not fully decorated. As a
6780 -- minor optimization we skip here internally generated subprograms.
6782 if (Ekind
(Def_Id
) /= E_Entry
6783 and then Ekind
(Def_Id
) /= E_Function
6784 and then Ekind
(Def_Id
) /= E_Procedure
)
6785 or else not Comes_From_Source
(Def_Id
)
6790 -- Search for the concurrent declaration since it contains the list
6791 -- of all implemented interfaces. In this case, the subprogram is
6792 -- declared within the scope of a protected or a task type.
6794 if Present
(Scope
(Def_Id
))
6795 and then Is_Concurrent_Type
(Scope
(Def_Id
))
6796 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
6798 Typ
:= Scope
(Def_Id
);
6801 -- The enclosing scope is not a synchronized type and the subprogram
6804 elsif No
(First_Formal
(Def_Id
)) then
6807 -- The subprogram has formals and hence it may be a primitive of a
6811 Typ
:= Etype
(First_Formal
(Def_Id
));
6813 if Is_Access_Type
(Typ
) then
6814 Typ
:= Directly_Designated_Type
(Typ
);
6817 if Is_Concurrent_Type
(Typ
)
6818 and then not Is_Generic_Actual_Type
(Typ
)
6822 -- This case occurs when the concurrent type is declared within
6823 -- a generic unit. As a result the corresponding record has been
6824 -- built and used as the type of the first formal, we just have
6825 -- to retrieve the corresponding concurrent type.
6827 elsif Is_Concurrent_Record_Type
(Typ
)
6828 and then Present
(Corresponding_Concurrent_Type
(Typ
))
6830 Typ
:= Corresponding_Concurrent_Type
(Typ
);
6838 -- There is no overriding to check if is an inherited operation in a
6839 -- type derivation on for a generic actual.
6841 Collect_Interfaces
(Typ
, Ifaces_List
);
6843 if Is_Empty_Elmt_List
(Ifaces_List
) then
6847 -- Determine whether entry or subprogram Def_Id overrides a primitive
6848 -- operation that belongs to one of the interfaces in Ifaces_List.
6851 Candidate
: Entity_Id
:= Empty
;
6852 Hom
: Entity_Id
:= Empty
;
6853 Iface_Typ
: Entity_Id
;
6854 Subp
: Entity_Id
:= Empty
;
6857 -- Traverse the homonym chain, looking at a potentially
6858 -- overridden subprogram that belongs to an implemented
6861 Hom
:= Current_Entity_In_Scope
(Def_Id
);
6862 while Present
(Hom
) loop
6866 or else not Is_Overloadable
(Subp
)
6867 or else not Is_Primitive
(Subp
)
6868 or else not Is_Dispatching_Operation
(Subp
)
6869 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
6873 -- Entries and procedures can override abstract or null
6874 -- interface procedures
6876 elsif (Ekind
(Def_Id
) = E_Procedure
6877 or else Ekind
(Def_Id
) = E_Entry
)
6878 and then Ekind
(Subp
) = E_Procedure
6879 and then Matches_Prefixed_View_Profile
6880 (Parameter_Specifications
(Parent
(Def_Id
)),
6881 Parameter_Specifications
(Parent
(Subp
)))
6885 -- For an overridden subprogram Subp, check whether the mode
6886 -- of its first parameter is correct depending on the kind
6887 -- of synchronized type.
6890 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
6893 -- In order for an entry or a protected procedure to
6894 -- override, the first parameter of the overridden
6895 -- routine must be of mode "out", "in out" or
6896 -- access-to-variable.
6898 if (Ekind
(Candidate
) = E_Entry
6899 or else Ekind
(Candidate
) = E_Procedure
)
6900 and then Is_Protected_Type
(Typ
)
6901 and then Ekind
(Formal
) /= E_In_Out_Parameter
6902 and then Ekind
(Formal
) /= E_Out_Parameter
6903 and then Nkind
(Parameter_Type
(Parent
(Formal
)))
6904 /= N_Access_Definition
6908 -- All other cases are OK since a task entry or routine
6909 -- does not have a restriction on the mode of the first
6910 -- parameter of the overridden interface routine.
6913 Overridden_Subp
:= Candidate
;
6918 -- Functions can override abstract interface functions
6920 elsif Ekind
(Def_Id
) = E_Function
6921 and then Ekind
(Subp
) = E_Function
6922 and then Matches_Prefixed_View_Profile
6923 (Parameter_Specifications
(Parent
(Def_Id
)),
6924 Parameter_Specifications
(Parent
(Subp
)))
6925 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
6926 Etype
(Result_Definition
(Parent
(Subp
)))
6928 Overridden_Subp
:= Subp
;
6932 Hom
:= Homonym
(Hom
);
6935 -- After examining all candidates for overriding, we are
6936 -- left with the best match which is a mode incompatible
6937 -- interface routine. Do not emit an error if the Expander
6938 -- is active since this error will be detected later on
6939 -- after all concurrent types are expanded and all wrappers
6940 -- are built. This check is meant for spec-only
6943 if Present
(Candidate
)
6944 and then not Expander_Active
6947 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
6949 -- Def_Id is primitive of a protected type, declared
6950 -- inside the type, and the candidate is primitive of a
6951 -- limited or synchronized interface.
6954 and then Is_Protected_Type
(Typ
)
6956 (Is_Limited_Interface
(Iface_Typ
)
6957 or else Is_Protected_Interface
(Iface_Typ
)
6958 or else Is_Synchronized_Interface
(Iface_Typ
)
6959 or else Is_Task_Interface
(Iface_Typ
))
6961 -- Must reword this message, comma before to in -gnatj
6965 ("first formal of & must be of mode `OUT`, `IN OUT`"
6966 & " or access-to-variable", Typ
, Candidate
);
6968 ("\to be overridden by protected procedure or entry "
6969 & "(RM 9.4(11.9/2))", Typ
);
6973 Overridden_Subp
:= Candidate
;
6976 end Check_Synchronized_Overriding
;
6978 ----------------------------
6979 -- Is_Private_Declaration --
6980 ----------------------------
6982 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
6983 Priv_Decls
: List_Id
;
6984 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
6987 if Is_Package_Or_Generic_Package
(Current_Scope
)
6988 and then In_Private_Part
(Current_Scope
)
6991 Private_Declarations
(
6992 Specification
(Unit_Declaration_Node
(Current_Scope
)));
6994 return In_Package_Body
(Current_Scope
)
6996 (Is_List_Member
(Decl
)
6997 and then List_Containing
(Decl
) = Priv_Decls
)
6998 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
6999 and then not Is_Compilation_Unit
(
7000 Defining_Entity
(Parent
(Decl
)))
7001 and then List_Containing
(Parent
(Parent
(Decl
)))
7006 end Is_Private_Declaration
;
7008 -- Start of processing for New_Overloaded_Entity
7011 -- We need to look for an entity that S may override. This must be a
7012 -- homonym in the current scope, so we look for the first homonym of
7013 -- S in the current scope as the starting point for the search.
7015 E
:= Current_Entity_In_Scope
(S
);
7017 -- If there is no homonym then this is definitely not overriding
7020 Enter_Overloaded_Entity
(S
);
7021 Check_Dispatching_Operation
(S
, Empty
);
7022 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7024 -- If subprogram has an explicit declaration, check whether it
7025 -- has an overriding indicator.
7027 if Comes_From_Source
(S
) then
7028 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7029 Check_Overriding_Indicator
7030 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7033 -- If there is a homonym that is not overloadable, then we have an
7034 -- error, except for the special cases checked explicitly below.
7036 elsif not Is_Overloadable
(E
) then
7038 -- Check for spurious conflict produced by a subprogram that has the
7039 -- same name as that of the enclosing generic package. The conflict
7040 -- occurs within an instance, between the subprogram and the renaming
7041 -- declaration for the package. After the subprogram, the package
7042 -- renaming declaration becomes hidden.
7044 if Ekind
(E
) = E_Package
7045 and then Present
(Renamed_Object
(E
))
7046 and then Renamed_Object
(E
) = Current_Scope
7047 and then Nkind
(Parent
(Renamed_Object
(E
))) =
7048 N_Package_Specification
7049 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
7052 Set_Is_Immediately_Visible
(E
, False);
7053 Enter_Overloaded_Entity
(S
);
7054 Set_Homonym
(S
, Homonym
(E
));
7055 Check_Dispatching_Operation
(S
, Empty
);
7056 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
7058 -- If the subprogram is implicit it is hidden by the previous
7059 -- declaration. However if it is dispatching, it must appear in the
7060 -- dispatch table anyway, because it can be dispatched to even if it
7061 -- cannot be called directly.
7063 elsif Present
(Alias
(S
))
7064 and then not Comes_From_Source
(S
)
7066 Set_Scope
(S
, Current_Scope
);
7068 if Is_Dispatching_Operation
(Alias
(S
)) then
7069 Check_Dispatching_Operation
(S
, Empty
);
7075 Error_Msg_Sloc
:= Sloc
(E
);
7077 -- Generate message, with useful additional warning if in generic
7079 if Is_Generic_Unit
(E
) then
7080 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
7081 Error_Msg_N
("\& conflicts with declaration#", S
);
7083 Error_Msg_N
("& conflicts with declaration#", S
);
7089 -- E exists and is overloadable
7092 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
7093 -- need no check against the homonym chain. They are directly added
7094 -- to the list of primitive operations of Derived_Type.
7096 if Ada_Version
>= Ada_05
7097 and then Present
(Derived_Type
)
7098 and then Is_Dispatching_Operation
(Alias
(S
))
7099 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
7100 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
7102 goto Add_New_Entity
;
7105 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7107 -- Loop through E and its homonyms to determine if any of them is
7108 -- the candidate for overriding by S.
7110 while Present
(E
) loop
7112 -- Definitely not interesting if not in the current scope
7114 if Scope
(E
) /= Current_Scope
then
7117 -- Check if we have type conformance
7119 elsif Type_Conformant
(E
, S
) then
7121 -- If the old and new entities have the same profile and one
7122 -- is not the body of the other, then this is an error, unless
7123 -- one of them is implicitly declared.
7125 -- There are some cases when both can be implicit, for example
7126 -- when both a literal and a function that overrides it are
7127 -- inherited in a derivation, or when an inherited operation
7128 -- of a tagged full type overrides the inherited operation of
7129 -- a private extension. Ada 83 had a special rule for the
7130 -- literal case. In Ada95, the later implicit operation hides
7131 -- the former, and the literal is always the former. In the
7132 -- odd case where both are derived operations declared at the
7133 -- same point, both operations should be declared, and in that
7134 -- case we bypass the following test and proceed to the next
7135 -- part (this can only occur for certain obscure cases
7136 -- involving homographs in instances and can't occur for
7137 -- dispatching operations ???). Note that the following
7138 -- condition is less than clear. For example, it's not at all
7139 -- clear why there's a test for E_Entry here. ???
7141 if Present
(Alias
(S
))
7142 and then (No
(Alias
(E
))
7143 or else Comes_From_Source
(E
)
7144 or else Is_Dispatching_Operation
(E
))
7146 (Ekind
(E
) = E_Entry
7147 or else Ekind
(E
) /= E_Enumeration_Literal
)
7149 -- When an derived operation is overloaded it may be due to
7150 -- the fact that the full view of a private extension
7151 -- re-inherits. It has to be dealt with.
7153 if Is_Package_Or_Generic_Package
(Current_Scope
)
7154 and then In_Private_Part
(Current_Scope
)
7156 Check_Operation_From_Private_View
(S
, E
);
7159 -- In any case the implicit operation remains hidden by
7160 -- the existing declaration, which is overriding.
7162 Set_Is_Overriding_Operation
(E
);
7164 if Comes_From_Source
(E
) then
7165 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
7167 -- Indicate that E overrides the operation from which
7170 if Present
(Alias
(S
)) then
7171 Set_Overridden_Operation
(E
, Alias
(S
));
7173 Set_Overridden_Operation
(E
, S
);
7179 -- Within an instance, the renaming declarations for
7180 -- actual subprograms may become ambiguous, but they do
7181 -- not hide each other.
7183 elsif Ekind
(E
) /= E_Entry
7184 and then not Comes_From_Source
(E
)
7185 and then not Is_Generic_Instance
(E
)
7186 and then (Present
(Alias
(E
))
7187 or else Is_Intrinsic_Subprogram
(E
))
7188 and then (not In_Instance
7189 or else No
(Parent
(E
))
7190 or else Nkind
(Unit_Declaration_Node
(E
)) /=
7191 N_Subprogram_Renaming_Declaration
)
7193 -- A subprogram child unit is not allowed to override
7194 -- an inherited subprogram (10.1.1(20)).
7196 if Is_Child_Unit
(S
) then
7198 ("child unit overrides inherited subprogram in parent",
7203 if Is_Non_Overriding_Operation
(E
, S
) then
7204 Enter_Overloaded_Entity
(S
);
7205 if No
(Derived_Type
)
7206 or else Is_Tagged_Type
(Derived_Type
)
7208 Check_Dispatching_Operation
(S
, Empty
);
7214 -- E is a derived operation or an internal operator which
7215 -- is being overridden. Remove E from further visibility.
7216 -- Furthermore, if E is a dispatching operation, it must be
7217 -- replaced in the list of primitive operations of its type
7218 -- (see Override_Dispatching_Operation).
7220 Overridden_Subp
:= E
;
7226 Prev
:= First_Entity
(Current_Scope
);
7228 while Present
(Prev
)
7229 and then Next_Entity
(Prev
) /= E
7234 -- It is possible for E to be in the current scope and
7235 -- yet not in the entity chain. This can only occur in a
7236 -- generic context where E is an implicit concatenation
7237 -- in the formal part, because in a generic body the
7238 -- entity chain starts with the formals.
7241 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
7243 -- E must be removed both from the entity_list of the
7244 -- current scope, and from the visibility chain
7246 if Debug_Flag_E
then
7247 Write_Str
("Override implicit operation ");
7248 Write_Int
(Int
(E
));
7252 -- If E is a predefined concatenation, it stands for four
7253 -- different operations. As a result, a single explicit
7254 -- declaration does not hide it. In a possible ambiguous
7255 -- situation, Disambiguate chooses the user-defined op,
7256 -- so it is correct to retain the previous internal one.
7258 if Chars
(E
) /= Name_Op_Concat
7259 or else Ekind
(E
) /= E_Operator
7261 -- For nondispatching derived operations that are
7262 -- overridden by a subprogram declared in the private
7263 -- part of a package, we retain the derived
7264 -- subprogram but mark it as not immediately visible.
7265 -- If the derived operation was declared in the
7266 -- visible part then this ensures that it will still
7267 -- be visible outside the package with the proper
7268 -- signature (calls from outside must also be
7269 -- directed to this version rather than the
7270 -- overriding one, unlike the dispatching case).
7271 -- Calls from inside the package will still resolve
7272 -- to the overriding subprogram since the derived one
7273 -- is marked as not visible within the package.
7275 -- If the private operation is dispatching, we achieve
7276 -- the overriding by keeping the implicit operation
7277 -- but setting its alias to be the overriding one. In
7278 -- this fashion the proper body is executed in all
7279 -- cases, but the original signature is used outside
7282 -- If the overriding is not in the private part, we
7283 -- remove the implicit operation altogether.
7285 if Is_Private_Declaration
(S
) then
7287 if not Is_Dispatching_Operation
(E
) then
7288 Set_Is_Immediately_Visible
(E
, False);
7290 -- Work done in Override_Dispatching_Operation,
7291 -- so nothing else need to be done here.
7297 -- Find predecessor of E in Homonym chain
7299 if E
= Current_Entity
(E
) then
7302 Prev_Vis
:= Current_Entity
(E
);
7303 while Homonym
(Prev_Vis
) /= E
loop
7304 Prev_Vis
:= Homonym
(Prev_Vis
);
7308 if Prev_Vis
/= Empty
then
7310 -- Skip E in the visibility chain
7312 Set_Homonym
(Prev_Vis
, Homonym
(E
));
7315 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7318 Set_Next_Entity
(Prev
, Next_Entity
(E
));
7320 if No
(Next_Entity
(Prev
)) then
7321 Set_Last_Entity
(Current_Scope
, Prev
);
7327 Enter_Overloaded_Entity
(S
);
7328 Set_Is_Overriding_Operation
(S
);
7329 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
7331 -- Indicate that S overrides the operation from which
7334 if Comes_From_Source
(S
) then
7335 if Present
(Alias
(E
)) then
7336 Set_Overridden_Operation
(S
, Alias
(E
));
7338 Set_Overridden_Operation
(S
, E
);
7342 if Is_Dispatching_Operation
(E
) then
7344 -- An overriding dispatching subprogram inherits the
7345 -- convention of the overridden subprogram (by
7348 Set_Convention
(S
, Convention
(E
));
7349 Check_Dispatching_Operation
(S
, E
);
7352 Check_Dispatching_Operation
(S
, Empty
);
7355 Check_For_Primitive_Subprogram
7356 (Is_Primitive_Subp
, Is_Overriding
=> True);
7357 goto Check_Inequality
;
7360 -- Apparent redeclarations in instances can occur when two
7361 -- formal types get the same actual type. The subprograms in
7362 -- in the instance are legal, even if not callable from the
7363 -- outside. Calls from within are disambiguated elsewhere.
7364 -- For dispatching operations in the visible part, the usual
7365 -- rules apply, and operations with the same profile are not
7368 elsif (In_Instance_Visible_Part
7369 and then not Is_Dispatching_Operation
(E
))
7370 or else In_Instance_Not_Visible
7374 -- Here we have a real error (identical profile)
7377 Error_Msg_Sloc
:= Sloc
(E
);
7379 -- Avoid cascaded errors if the entity appears in
7380 -- subsequent calls.
7382 Set_Scope
(S
, Current_Scope
);
7384 -- Generate error, with extra useful warning for the case
7385 -- of a generic instance with no completion.
7387 if Is_Generic_Instance
(S
)
7388 and then not Has_Completion
(E
)
7391 ("instantiation cannot provide body for&", S
);
7392 Error_Msg_N
("\& conflicts with declaration#", S
);
7394 Error_Msg_N
("& conflicts with declaration#", S
);
7401 -- If one subprogram has an access parameter and the other
7402 -- a parameter of an access type, calls to either might be
7403 -- ambiguous. Verify that parameters match except for the
7404 -- access parameter.
7406 if May_Hide_Profile
then
7411 F1
:= First_Formal
(S
);
7412 F2
:= First_Formal
(E
);
7413 while Present
(F1
) and then Present
(F2
) loop
7414 if Is_Access_Type
(Etype
(F1
)) then
7415 if not Is_Access_Type
(Etype
(F2
))
7416 or else not Conforming_Types
7417 (Designated_Type
(Etype
(F1
)),
7418 Designated_Type
(Etype
(F2
)),
7421 May_Hide_Profile
:= False;
7425 not Conforming_Types
7426 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
7428 May_Hide_Profile
:= False;
7439 Error_Msg_NE
("calls to& may be ambiguous?", S
, S
);
7450 -- On exit, we know that S is a new entity
7452 Enter_Overloaded_Entity
(S
);
7453 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7454 Check_Overriding_Indicator
7455 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7457 -- If S is a derived operation for an untagged type then by
7458 -- definition it's not a dispatching operation (even if the parent
7459 -- operation was dispatching), so we don't call
7460 -- Check_Dispatching_Operation in that case.
7462 if No
(Derived_Type
)
7463 or else Is_Tagged_Type
(Derived_Type
)
7465 Check_Dispatching_Operation
(S
, Empty
);
7469 -- If this is a user-defined equality operator that is not a derived
7470 -- subprogram, create the corresponding inequality. If the operation is
7471 -- dispatching, the expansion is done elsewhere, and we do not create
7472 -- an explicit inequality operation.
7474 <<Check_Inequality
>>
7475 if Chars
(S
) = Name_Op_Eq
7476 and then Etype
(S
) = Standard_Boolean
7477 and then Present
(Parent
(S
))
7478 and then not Is_Dispatching_Operation
(S
)
7480 Make_Inequality_Operator
(S
);
7482 end New_Overloaded_Entity
;
7484 ---------------------
7485 -- Process_Formals --
7486 ---------------------
7488 procedure Process_Formals
7490 Related_Nod
: Node_Id
)
7492 Param_Spec
: Node_Id
;
7494 Formal_Type
: Entity_Id
;
7498 Num_Out_Params
: Nat
:= 0;
7499 First_Out_Param
: Entity_Id
:= Empty
;
7500 -- Used for setting Is_Only_Out_Parameter
7502 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
7503 -- Check whether the default has a class-wide type. After analysis the
7504 -- default has the type of the formal, so we must also check explicitly
7505 -- for an access attribute.
7507 ---------------------------
7508 -- Is_Class_Wide_Default --
7509 ---------------------------
7511 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
7513 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
7514 or else (Nkind
(D
) = N_Attribute_Reference
7515 and then Attribute_Name
(D
) = Name_Access
7516 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
7517 end Is_Class_Wide_Default
;
7519 -- Start of processing for Process_Formals
7522 -- In order to prevent premature use of the formals in the same formal
7523 -- part, the Ekind is left undefined until all default expressions are
7524 -- analyzed. The Ekind is established in a separate loop at the end.
7526 Param_Spec
:= First
(T
);
7527 while Present
(Param_Spec
) loop
7528 Formal
:= Defining_Identifier
(Param_Spec
);
7529 Set_Never_Set_In_Source
(Formal
, True);
7530 Enter_Name
(Formal
);
7532 -- Case of ordinary parameters
7534 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
7535 Find_Type
(Parameter_Type
(Param_Spec
));
7536 Ptype
:= Parameter_Type
(Param_Spec
);
7538 if Ptype
= Error
then
7542 Formal_Type
:= Entity
(Ptype
);
7544 if Is_Incomplete_Type
(Formal_Type
)
7546 (Is_Class_Wide_Type
(Formal_Type
)
7547 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
7549 -- Ada 2005 (AI-326): Tagged incomplete types allowed
7551 if Is_Tagged_Type
(Formal_Type
) then
7554 -- Special handling of Value_Type for CIL case
7556 elsif Is_Value_Type
(Formal_Type
) then
7559 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
7560 N_Access_Procedure_Definition
)
7562 Error_Msg_N
("invalid use of incomplete type", Param_Spec
);
7564 -- An incomplete type that is not tagged is allowed in an
7565 -- access-to-subprogram type only if it is a local declaration
7566 -- with a forthcoming completion (3.10.1 (9.2/2)).
7568 elsif Scope
(Formal_Type
) /= Scope
(Current_Scope
) then
7570 ("invalid use of limited view of type", Param_Spec
);
7573 elsif Ekind
(Formal_Type
) = E_Void
then
7574 Error_Msg_NE
("premature use of&",
7575 Parameter_Type
(Param_Spec
), Formal_Type
);
7578 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7579 -- declaration corresponding to the null-excluding type of the
7580 -- formal in the enclosing scope. Finally, replace the parameter
7581 -- type of the formal with the internal subtype.
7583 if Ada_Version
>= Ada_05
7584 and then Null_Exclusion_Present
(Param_Spec
)
7586 if not Is_Access_Type
(Formal_Type
) then
7588 ("`NOT NULL` allowed only for an access type", Param_Spec
);
7591 if Can_Never_Be_Null
(Formal_Type
)
7592 and then Comes_From_Source
(Related_Nod
)
7595 ("`NOT NULL` not allowed (& already excludes null)",
7601 Create_Null_Excluding_Itype
7603 Related_Nod
=> Related_Nod
,
7604 Scope_Id
=> Scope
(Current_Scope
));
7606 -- If the designated type of the itype is an itype we
7607 -- decorate it with the Has_Delayed_Freeze attribute to
7608 -- avoid problems with the backend.
7611 -- type T is access procedure;
7612 -- procedure Op (O : not null T);
7614 if Is_Itype
(Directly_Designated_Type
(Formal_Type
)) then
7615 Set_Has_Delayed_Freeze
(Formal_Type
);
7620 -- An access formal type
7624 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
7626 -- No need to continue if we already notified errors
7628 if not Present
(Formal_Type
) then
7632 -- Ada 2005 (AI-254)
7635 AD
: constant Node_Id
:=
7636 Access_To_Subprogram_Definition
7637 (Parameter_Type
(Param_Spec
));
7639 if Present
(AD
) and then Protected_Present
(AD
) then
7641 Replace_Anonymous_Access_To_Protected_Subprogram
7647 Set_Etype
(Formal
, Formal_Type
);
7648 Default
:= Expression
(Param_Spec
);
7650 if Present
(Default
) then
7651 if Out_Present
(Param_Spec
) then
7653 ("default initialization only allowed for IN parameters",
7657 -- Do the special preanalysis of the expression (see section on
7658 -- "Handling of Default Expressions" in the spec of package Sem).
7660 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
7662 -- An access to constant cannot be the default for
7663 -- an access parameter that is an access to variable.
7665 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7666 and then not Is_Access_Constant
(Formal_Type
)
7667 and then Is_Access_Type
(Etype
(Default
))
7668 and then Is_Access_Constant
(Etype
(Default
))
7671 ("formal that is access to variable cannot be initialized " &
7672 "with an access-to-constant expression", Default
);
7675 -- Check that the designated type of an access parameter's default
7676 -- is not a class-wide type unless the parameter's designated type
7677 -- is also class-wide.
7679 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7680 and then not From_With_Type
(Formal_Type
)
7681 and then Is_Class_Wide_Default
(Default
)
7682 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
7685 ("access to class-wide expression not allowed here", Default
);
7689 -- Ada 2005 (AI-231): Static checks
7691 if Ada_Version
>= Ada_05
7692 and then Is_Access_Type
(Etype
(Formal
))
7693 and then Can_Never_Be_Null
(Etype
(Formal
))
7695 Null_Exclusion_Static_Checks
(Param_Spec
);
7702 -- If this is the formal part of a function specification, analyze the
7703 -- subtype mark in the context where the formals are visible but not
7704 -- yet usable, and may hide outer homographs.
7706 if Nkind
(Related_Nod
) = N_Function_Specification
then
7707 Analyze_Return_Type
(Related_Nod
);
7710 -- Now set the kind (mode) of each formal
7712 Param_Spec
:= First
(T
);
7714 while Present
(Param_Spec
) loop
7715 Formal
:= Defining_Identifier
(Param_Spec
);
7716 Set_Formal_Mode
(Formal
);
7718 if Ekind
(Formal
) = E_In_Parameter
then
7719 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
7721 if Present
(Expression
(Param_Spec
)) then
7722 Default
:= Expression
(Param_Spec
);
7724 if Is_Scalar_Type
(Etype
(Default
)) then
7726 (Parameter_Type
(Param_Spec
)) /= N_Access_Definition
7728 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
7731 Formal_Type
:= Access_Definition
7732 (Related_Nod
, Parameter_Type
(Param_Spec
));
7735 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
7739 elsif Ekind
(Formal
) = E_Out_Parameter
then
7740 Num_Out_Params
:= Num_Out_Params
+ 1;
7742 if Num_Out_Params
= 1 then
7743 First_Out_Param
:= Formal
;
7746 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
7747 Num_Out_Params
:= Num_Out_Params
+ 1;
7753 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
7754 Set_Is_Only_Out_Parameter
(First_Out_Param
);
7756 end Process_Formals
;
7762 procedure Process_PPCs
7764 Spec_Id
: Entity_Id
;
7765 Body_Id
: Entity_Id
)
7767 Loc
: constant Source_Ptr
:= Sloc
(N
);
7769 Plist
: List_Id
:= No_List
;
7773 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
;
7774 -- Prag contains an analyzed precondition or postcondition pragma.
7775 -- This function copies the pragma, changes it to the corresponding
7776 -- Check pragma and returns the Check pragma as the result. The
7777 -- argument Nam is either Name_Precondition or Name_Postcondition.
7783 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
is
7784 CP
: constant Node_Id
:= New_Copy_Tree
(Prag
);
7787 -- Set Analyzed to false, since we want to reanalyze the check
7788 -- procedure. Note that it is only at the outer level that we
7789 -- do this fiddling, for the spec cases, the already preanalyzed
7790 -- parameters are not affected.
7792 -- For a postcondition pragma within a generic, preserve the pragma
7793 -- for later expansion.
7795 Set_Analyzed
(CP
, False);
7797 if Nam
= Name_Postcondition
7798 and then not Expander_Active
7803 -- Change pragma into corresponding pragma Check
7805 Prepend_To
(Pragma_Argument_Associations
(CP
),
7806 Make_Pragma_Argument_Association
(Sloc
(Prag
),
7808 Make_Identifier
(Loc
,
7810 Set_Pragma_Identifier
(CP
,
7811 Make_Identifier
(Sloc
(Prag
),
7812 Chars
=> Name_Check
));
7817 -- Start of processing for Process_PPCs
7820 -- Nothing to do if we are not generating code
7822 if Operating_Mode
/= Generate_Code
then
7826 -- Grab preconditions from spec
7828 if Present
(Spec_Id
) then
7830 -- Loop through PPC pragmas from spec. Note that preconditions from
7831 -- the body will be analyzed and converted when we scan the body
7832 -- declarations below.
7834 Prag
:= Spec_PPC_List
(Spec_Id
);
7835 while Present
(Prag
) loop
7836 if Pragma_Name
(Prag
) = Name_Precondition
7837 and then PPC_Enabled
(Prag
)
7839 -- Add pragma Check at the start of the declarations of N.
7840 -- Note that this processing reverses the order of the list,
7841 -- which is what we want since new entries were chained to
7842 -- the head of the list.
7844 Prepend
(Grab_PPC
(Name_Precondition
), Declarations
(N
));
7847 Prag
:= Next_Pragma
(Prag
);
7851 -- Build postconditions procedure if needed and prepend the following
7852 -- declaration to the start of the declarations for the subprogram.
7854 -- procedure _postconditions [(_Result : resulttype)] is
7856 -- pragma Check (Postcondition, condition [,message]);
7857 -- pragma Check (Postcondition, condition [,message]);
7861 -- First we deal with the postconditions in the body
7863 if Is_Non_Empty_List
(Declarations
(N
)) then
7865 -- Loop through declarations
7867 Prag
:= First
(Declarations
(N
));
7868 while Present
(Prag
) loop
7869 if Nkind
(Prag
) = N_Pragma
then
7871 -- If pragma, capture if enabled postcondition, else ignore
7873 if Pragma_Name
(Prag
) = Name_Postcondition
7874 and then Check_Enabled
(Name_Postcondition
)
7876 if Plist
= No_List
then
7877 Plist
:= Empty_List
;
7882 -- If expansion is disabled, as in a generic unit,
7883 -- save pragma for later expansion.
7885 if not Expander_Active
then
7886 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
7888 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7894 -- Not a pragma, if comes from source, then end scan
7896 elsif Comes_From_Source
(Prag
) then
7899 -- Skip stuff not coming from source
7907 -- Now deal with any postconditions from the spec
7909 if Present
(Spec_Id
) then
7911 -- Loop through PPC pragmas from spec
7913 Prag
:= Spec_PPC_List
(Spec_Id
);
7914 while Present
(Prag
) loop
7915 if Pragma_Name
(Prag
) = Name_Postcondition
7916 and then PPC_Enabled
(Prag
)
7918 if Plist
= No_List
then
7919 Plist
:= Empty_List
;
7922 if not Expander_Active
then
7923 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
7925 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7929 Prag
:= Next_Pragma
(Prag
);
7933 -- If we had any postconditions and expansion is enabled, build
7934 -- the Postconditions procedure.
7937 and then Expander_Active
7939 Subp
:= Defining_Entity
(N
);
7941 if Etype
(Subp
) /= Standard_Void_Type
then
7943 Make_Parameter_Specification
(Loc
,
7944 Defining_Identifier
=>
7945 Make_Defining_Identifier
(Loc
,
7946 Chars
=> Name_uResult
),
7947 Parameter_Type
=> New_Occurrence_Of
(Etype
(Subp
), Loc
)));
7952 Prepend_To
(Declarations
(N
),
7953 Make_Subprogram_Body
(Loc
,
7955 Make_Procedure_Specification
(Loc
,
7956 Defining_Unit_Name
=>
7957 Make_Defining_Identifier
(Loc
,
7958 Chars
=> Name_uPostconditions
),
7959 Parameter_Specifications
=> Parms
),
7961 Declarations
=> Empty_List
,
7963 Handled_Statement_Sequence
=>
7964 Make_Handled_Sequence_Of_Statements
(Loc
,
7965 Statements
=> Plist
)));
7967 if Present
(Spec_Id
) then
7968 Set_Has_Postconditions
(Spec_Id
);
7970 Set_Has_Postconditions
(Body_Id
);
7975 ----------------------------
7976 -- Reference_Body_Formals --
7977 ----------------------------
7979 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
7984 if Error_Posted
(Spec
) then
7988 -- Iterate over both lists. They may be of different lengths if the two
7989 -- specs are not conformant.
7991 Fs
:= First_Formal
(Spec
);
7992 Fb
:= First_Formal
(Bod
);
7993 while Present
(Fs
) and then Present
(Fb
) loop
7994 Generate_Reference
(Fs
, Fb
, 'b');
7997 Style
.Check_Identifier
(Fb
, Fs
);
8000 Set_Spec_Entity
(Fb
, Fs
);
8001 Set_Referenced
(Fs
, False);
8005 end Reference_Body_Formals
;
8007 -------------------------
8008 -- Set_Actual_Subtypes --
8009 -------------------------
8011 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
8012 Loc
: constant Source_Ptr
:= Sloc
(N
);
8016 First_Stmt
: Node_Id
:= Empty
;
8017 AS_Needed
: Boolean;
8020 -- If this is an empty initialization procedure, no need to create
8021 -- actual subtypes (small optimization).
8023 if Ekind
(Subp
) = E_Procedure
8024 and then Is_Null_Init_Proc
(Subp
)
8029 Formal
:= First_Formal
(Subp
);
8030 while Present
(Formal
) loop
8031 T
:= Etype
(Formal
);
8033 -- We never need an actual subtype for a constrained formal
8035 if Is_Constrained
(T
) then
8038 -- If we have unknown discriminants, then we do not need an actual
8039 -- subtype, or more accurately we cannot figure it out! Note that
8040 -- all class-wide types have unknown discriminants.
8042 elsif Has_Unknown_Discriminants
(T
) then
8045 -- At this stage we have an unconstrained type that may need an
8046 -- actual subtype. For sure the actual subtype is needed if we have
8047 -- an unconstrained array type.
8049 elsif Is_Array_Type
(T
) then
8052 -- The only other case needing an actual subtype is an unconstrained
8053 -- record type which is an IN parameter (we cannot generate actual
8054 -- subtypes for the OUT or IN OUT case, since an assignment can
8055 -- change the discriminant values. However we exclude the case of
8056 -- initialization procedures, since discriminants are handled very
8057 -- specially in this context, see the section entitled "Handling of
8058 -- Discriminants" in Einfo.
8060 -- We also exclude the case of Discrim_SO_Functions (functions used
8061 -- in front end layout mode for size/offset values), since in such
8062 -- functions only discriminants are referenced, and not only are such
8063 -- subtypes not needed, but they cannot always be generated, because
8064 -- of order of elaboration issues.
8066 elsif Is_Record_Type
(T
)
8067 and then Ekind
(Formal
) = E_In_Parameter
8068 and then Chars
(Formal
) /= Name_uInit
8069 and then not Is_Unchecked_Union
(T
)
8070 and then not Is_Discrim_SO_Function
(Subp
)
8074 -- All other cases do not need an actual subtype
8080 -- Generate actual subtypes for unconstrained arrays and
8081 -- unconstrained discriminated records.
8084 if Nkind
(N
) = N_Accept_Statement
then
8086 -- If expansion is active, The formal is replaced by a local
8087 -- variable that renames the corresponding entry of the
8088 -- parameter block, and it is this local variable that may
8089 -- require an actual subtype.
8091 if Expander_Active
then
8092 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
8094 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8097 if Present
(Handled_Statement_Sequence
(N
)) then
8099 First
(Statements
(Handled_Statement_Sequence
(N
)));
8100 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
8101 Mark_Rewrite_Insertion
(Decl
);
8103 -- If the accept statement has no body, there will be no
8104 -- reference to the actuals, so no need to compute actual
8111 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8112 Prepend
(Decl
, Declarations
(N
));
8113 Mark_Rewrite_Insertion
(Decl
);
8116 -- The declaration uses the bounds of an existing object, and
8117 -- therefore needs no constraint checks.
8119 Analyze
(Decl
, Suppress
=> All_Checks
);
8121 -- We need to freeze manually the generated type when it is
8122 -- inserted anywhere else than in a declarative part.
8124 if Present
(First_Stmt
) then
8125 Insert_List_Before_And_Analyze
(First_Stmt
,
8126 Freeze_Entity
(Defining_Identifier
(Decl
), Loc
));
8129 if Nkind
(N
) = N_Accept_Statement
8130 and then Expander_Active
8132 Set_Actual_Subtype
(Renamed_Object
(Formal
),
8133 Defining_Identifier
(Decl
));
8135 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
8139 Next_Formal
(Formal
);
8141 end Set_Actual_Subtypes
;
8143 ---------------------
8144 -- Set_Formal_Mode --
8145 ---------------------
8147 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
8148 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
8151 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
8152 -- since we ensure that corresponding actuals are always valid at the
8153 -- point of the call.
8155 if Out_Present
(Spec
) then
8156 if Ekind
(Scope
(Formal_Id
)) = E_Function
8157 or else Ekind
(Scope
(Formal_Id
)) = E_Generic_Function
8159 Error_Msg_N
("functions can only have IN parameters", Spec
);
8160 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8162 elsif In_Present
(Spec
) then
8163 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
8166 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
8167 Set_Never_Set_In_Source
(Formal_Id
, True);
8168 Set_Is_True_Constant
(Formal_Id
, False);
8169 Set_Current_Value
(Formal_Id
, Empty
);
8173 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8176 -- Set Is_Known_Non_Null for access parameters since the language
8177 -- guarantees that access parameters are always non-null. We also set
8178 -- Can_Never_Be_Null, since there is no way to change the value.
8180 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
8182 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
8183 -- null; In Ada 2005, only if then null_exclusion is explicit.
8185 if Ada_Version
< Ada_05
8186 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
8188 Set_Is_Known_Non_Null
(Formal_Id
);
8189 Set_Can_Never_Be_Null
(Formal_Id
);
8192 -- Ada 2005 (AI-231): Null-exclusion access subtype
8194 elsif Is_Access_Type
(Etype
(Formal_Id
))
8195 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
8197 Set_Is_Known_Non_Null
(Formal_Id
);
8200 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
8201 Set_Formal_Validity
(Formal_Id
);
8202 end Set_Formal_Mode
;
8204 -------------------------
8205 -- Set_Formal_Validity --
8206 -------------------------
8208 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
8210 -- If no validity checking, then we cannot assume anything about the
8211 -- validity of parameters, since we do not know there is any checking
8212 -- of the validity on the call side.
8214 if not Validity_Checks_On
then
8217 -- If validity checking for parameters is enabled, this means we are
8218 -- not supposed to make any assumptions about argument values.
8220 elsif Validity_Check_Parameters
then
8223 -- If we are checking in parameters, we will assume that the caller is
8224 -- also checking parameters, so we can assume the parameter is valid.
8226 elsif Ekind
(Formal_Id
) = E_In_Parameter
8227 and then Validity_Check_In_Params
8229 Set_Is_Known_Valid
(Formal_Id
, True);
8231 -- Similar treatment for IN OUT parameters
8233 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
8234 and then Validity_Check_In_Out_Params
8236 Set_Is_Known_Valid
(Formal_Id
, True);
8238 end Set_Formal_Validity
;
8240 ------------------------
8241 -- Subtype_Conformant --
8242 ------------------------
8244 function Subtype_Conformant
8245 (New_Id
: Entity_Id
;
8247 Skip_Controlling_Formals
: Boolean := False) return Boolean
8251 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
8252 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8254 end Subtype_Conformant
;
8256 ---------------------
8257 -- Type_Conformant --
8258 ---------------------
8260 function Type_Conformant
8261 (New_Id
: Entity_Id
;
8263 Skip_Controlling_Formals
: Boolean := False) return Boolean
8267 May_Hide_Profile
:= False;
8270 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
8271 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8273 end Type_Conformant
;
8275 -------------------------------
8276 -- Valid_Operator_Definition --
8277 -------------------------------
8279 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
8282 Id
: constant Name_Id
:= Chars
(Designator
);
8286 F
:= First_Formal
(Designator
);
8287 while Present
(F
) loop
8290 if Present
(Default_Value
(F
)) then
8292 ("default values not allowed for operator parameters",
8299 -- Verify that user-defined operators have proper number of arguments
8300 -- First case of operators which can only be unary
8303 or else Id
= Name_Op_Abs
8307 -- Case of operators which can be unary or binary
8309 elsif Id
= Name_Op_Add
8310 or Id
= Name_Op_Subtract
8312 N_OK
:= (N
in 1 .. 2);
8314 -- All other operators can only be binary
8322 ("incorrect number of arguments for operator", Designator
);
8326 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
8327 and then not Is_Intrinsic_Subprogram
(Designator
)
8330 ("explicit definition of inequality not allowed", Designator
);
8332 end Valid_Operator_Definition
;