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",
1729 and then Is_Overriding_Operation
(Spec_Id
)
1731 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
1732 Style
.Missing_Overriding
(N
, Body_Id
);
1734 end Verify_Overriding_Indicator
;
1736 -- Start of processing for Analyze_Subprogram_Body
1739 if Debug_Flag_C
then
1740 Write_Str
("==== Compiling subprogram body ");
1741 Write_Name
(Chars
(Body_Id
));
1742 Write_Str
(" from ");
1743 Write_Location
(Loc
);
1747 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
1749 -- Generic subprograms are handled separately. They always have a
1750 -- generic specification. Determine whether current scope has a
1751 -- previous declaration.
1753 -- If the subprogram body is defined within an instance of the same
1754 -- name, the instance appears as a package renaming, and will be hidden
1755 -- within the subprogram.
1757 if Present
(Prev_Id
)
1758 and then not Is_Overloadable
(Prev_Id
)
1759 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
1760 or else Comes_From_Source
(Prev_Id
))
1762 if Is_Generic_Subprogram
(Prev_Id
) then
1764 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1765 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1767 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
1771 -- Previous entity conflicts with subprogram name. Attempting to
1772 -- enter name will post error.
1774 Enter_Name
(Body_Id
);
1778 -- Non-generic case, find the subprogram declaration, if one was seen,
1779 -- or enter new overloaded entity in the current scope. If the
1780 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
1781 -- part of the context of one of its subunits. No need to redo the
1784 elsif Prev_Id
= Body_Id
1785 and then Has_Completion
(Body_Id
)
1790 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
1792 if Nkind
(N
) = N_Subprogram_Body_Stub
1793 or else No
(Corresponding_Spec
(N
))
1795 if Is_Private_Concurrent_Primitive
(Body_Id
) then
1796 Spec_Id
:= Disambiguate_Spec
;
1798 Spec_Id
:= Find_Corresponding_Spec
(N
);
1801 -- If this is a duplicate body, no point in analyzing it
1803 if Error_Posted
(N
) then
1807 -- A subprogram body should cause freezing of its own declaration,
1808 -- but if there was no previous explicit declaration, then the
1809 -- subprogram will get frozen too late (there may be code within
1810 -- the body that depends on the subprogram having been frozen,
1811 -- such as uses of extra formals), so we force it to be frozen
1812 -- here. Same holds if the body and spec are compilation units.
1813 -- Finally, if the return type is an anonymous access to protected
1814 -- subprogram, it must be frozen before the body because its
1815 -- expansion has generated an equivalent type that is used when
1816 -- elaborating the body.
1818 if No
(Spec_Id
) then
1819 Freeze_Before
(N
, Body_Id
);
1821 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1822 Freeze_Before
(N
, Spec_Id
);
1824 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
1825 Freeze_Before
(N
, Etype
(Body_Id
));
1829 Spec_Id
:= Corresponding_Spec
(N
);
1833 -- Do not inline any subprogram that contains nested subprograms, since
1834 -- the backend inlining circuit seems to generate uninitialized
1835 -- references in this case. We know this happens in the case of front
1836 -- end ZCX support, but it also appears it can happen in other cases as
1837 -- well. The backend often rejects attempts to inline in the case of
1838 -- nested procedures anyway, so little if anything is lost by this.
1839 -- Note that this is test is for the benefit of the back-end. There is
1840 -- a separate test for front-end inlining that also rejects nested
1843 -- Do not do this test if errors have been detected, because in some
1844 -- error cases, this code blows up, and we don't need it anyway if
1845 -- there have been errors, since we won't get to the linker anyway.
1847 if Comes_From_Source
(Body_Id
)
1848 and then Serious_Errors_Detected
= 0
1852 P_Ent
:= Scope
(P_Ent
);
1853 exit when No
(P_Ent
) or else P_Ent
= Standard_Standard
;
1855 if Is_Subprogram
(P_Ent
) then
1856 Set_Is_Inlined
(P_Ent
, False);
1858 if Comes_From_Source
(P_Ent
)
1859 and then Has_Pragma_Inline
(P_Ent
)
1862 ("cannot inline& (nested subprogram)?",
1869 Check_Inline_Pragma
(Spec_Id
);
1871 -- Case of fully private operation in the body of the protected type.
1872 -- We must create a declaration for the subprogram, in order to attach
1873 -- the protected subprogram that will be used in internal calls.
1876 and then Comes_From_Source
(N
)
1877 and then Is_Protected_Type
(Current_Scope
)
1886 Formal
:= First_Formal
(Body_Id
);
1888 -- The protected operation always has at least one formal, namely
1889 -- the object itself, but it is only placed in the parameter list
1890 -- if expansion is enabled.
1893 or else Expander_Active
1895 Plist
:= Copy_Parameter_List
(Body_Id
);
1900 if Nkind
(Body_Spec
) = N_Procedure_Specification
then
1902 Make_Procedure_Specification
(Loc
,
1903 Defining_Unit_Name
=>
1904 Make_Defining_Identifier
(Sloc
(Body_Id
),
1905 Chars
=> Chars
(Body_Id
)),
1906 Parameter_Specifications
=> Plist
);
1909 Make_Function_Specification
(Loc
,
1910 Defining_Unit_Name
=>
1911 Make_Defining_Identifier
(Sloc
(Body_Id
),
1912 Chars
=> Chars
(Body_Id
)),
1913 Parameter_Specifications
=> Plist
,
1914 Result_Definition
=>
1915 New_Occurrence_Of
(Etype
(Body_Id
), Loc
));
1919 Make_Subprogram_Declaration
(Loc
,
1920 Specification
=> New_Spec
);
1921 Insert_Before
(N
, Decl
);
1922 Spec_Id
:= Defining_Unit_Name
(New_Spec
);
1924 -- Indicate that the entity comes from source, to ensure that
1925 -- cross-reference information is properly generated. The body
1926 -- itself is rewritten during expansion, and the body entity will
1927 -- not appear in calls to the operation.
1929 Set_Comes_From_Source
(Spec_Id
, True);
1931 Set_Has_Completion
(Spec_Id
);
1932 Set_Convention
(Spec_Id
, Convention_Protected
);
1935 elsif Present
(Spec_Id
) then
1936 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
1937 Verify_Overriding_Indicator
;
1939 -- In general, the spec will be frozen when we start analyzing the
1940 -- body. However, for internally generated operations, such as
1941 -- wrapper functions for inherited operations with controlling
1942 -- results, the spec may not have been frozen by the time we
1943 -- expand the freeze actions that include the bodies. In particular,
1944 -- extra formals for accessibility or for return-in-place may need
1945 -- to be generated. Freeze nodes, if any, are inserted before the
1948 if not Is_Frozen
(Spec_Id
)
1949 and then Expander_Active
1951 -- Force the generation of its freezing node to ensure proper
1952 -- management of access types in the backend.
1954 -- This is definitely needed for some cases, but it is not clear
1955 -- why, to be investigated further???
1957 Set_Has_Delayed_Freeze
(Spec_Id
);
1958 Insert_Actions
(N
, Freeze_Entity
(Spec_Id
, Loc
));
1962 if Chars
(Body_Id
) = Name_uPostconditions
then
1963 Set_Has_Postconditions
(Current_Scope
);
1966 -- Place subprogram on scope stack, and make formals visible. If there
1967 -- is a spec, the visible entity remains that of the spec.
1969 if Present
(Spec_Id
) then
1970 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
1972 if Is_Child_Unit
(Spec_Id
) then
1973 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
1977 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
1980 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1981 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1983 if Is_Abstract_Subprogram
(Spec_Id
) then
1984 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
1988 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
1989 Set_Has_Completion
(Spec_Id
);
1991 if Is_Protected_Type
(Scope
(Spec_Id
)) then
1992 Prot_Typ
:= Scope
(Spec_Id
);
1995 -- If this is a body generated for a renaming, do not check for
1996 -- full conformance. The check is redundant, because the spec of
1997 -- the body is a copy of the spec in the renaming declaration,
1998 -- and the test can lead to spurious errors on nested defaults.
2000 if Present
(Spec_Decl
)
2001 and then not Comes_From_Source
(N
)
2003 (Nkind
(Original_Node
(Spec_Decl
)) =
2004 N_Subprogram_Renaming_Declaration
2005 or else (Present
(Corresponding_Body
(Spec_Decl
))
2007 Nkind
(Unit_Declaration_Node
2008 (Corresponding_Body
(Spec_Decl
))) =
2009 N_Subprogram_Renaming_Declaration
))
2016 Fully_Conformant
, True, Conformant
, Body_Id
);
2019 -- If the body is not fully conformant, we have to decide if we
2020 -- should analyze it or not. If it has a really messed up profile
2021 -- then we probably should not analyze it, since we will get too
2022 -- many bogus messages.
2024 -- Our decision is to go ahead in the non-fully conformant case
2025 -- only if it is at least mode conformant with the spec. Note
2026 -- that the call to Check_Fully_Conformant has issued the proper
2027 -- error messages to complain about the lack of conformance.
2030 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
2036 if Spec_Id
/= Body_Id
then
2037 Reference_Body_Formals
(Spec_Id
, Body_Id
);
2040 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2041 Set_Corresponding_Spec
(N
, Spec_Id
);
2043 -- Ada 2005 (AI-345): If the operation is a primitive operation
2044 -- of a concurrent type, the type of the first parameter has been
2045 -- replaced with the corresponding record, which is the proper
2046 -- run-time structure to use. However, within the body there may
2047 -- be uses of the formals that depend on primitive operations
2048 -- of the type (in particular calls in prefixed form) for which
2049 -- we need the original concurrent type. The operation may have
2050 -- several controlling formals, so the replacement must be done
2053 if Comes_From_Source
(Spec_Id
)
2054 and then Present
(First_Entity
(Spec_Id
))
2055 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
2056 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
2058 Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
2061 (Corresponding_Concurrent_Type
2062 (Etype
(First_Entity
(Spec_Id
))))
2065 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
2069 Form
:= First_Formal
(Spec_Id
);
2070 while Present
(Form
) loop
2071 if Etype
(Form
) = Typ
then
2072 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
2080 -- Make the formals visible, and place subprogram on scope stack.
2081 -- This is also the point at which we set Last_Real_Spec_Entity
2082 -- to mark the entities which will not be moved to the body.
2084 Install_Formals
(Spec_Id
);
2085 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
2086 Push_Scope
(Spec_Id
);
2088 -- Make sure that the subprogram is immediately visible. For
2089 -- child units that have no separate spec this is indispensable.
2090 -- Otherwise it is safe albeit redundant.
2092 Set_Is_Immediately_Visible
(Spec_Id
);
2095 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
2096 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
2097 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
2098 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
2100 -- Case of subprogram body with no previous spec
2104 and then Comes_From_Source
(Body_Id
)
2105 and then not Suppress_Style_Checks
(Body_Id
)
2106 and then not In_Instance
2108 Style
.Body_With_No_Spec
(N
);
2111 New_Overloaded_Entity
(Body_Id
);
2113 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2114 Set_Acts_As_Spec
(N
);
2115 Generate_Definition
(Body_Id
);
2117 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
2118 Generate_Reference_To_Formals
(Body_Id
);
2119 Install_Formals
(Body_Id
);
2120 Push_Scope
(Body_Id
);
2124 -- If the return type is an anonymous access type whose designated type
2125 -- is the limited view of a class-wide type and the non-limited view is
2126 -- available, update the return type accordingly.
2128 if Ada_Version
>= Ada_05
2129 and then Comes_From_Source
(N
)
2136 Rtyp
:= Etype
(Current_Scope
);
2138 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
2139 Etyp
:= Directly_Designated_Type
(Rtyp
);
2141 if Is_Class_Wide_Type
(Etyp
)
2142 and then From_With_Type
(Etyp
)
2144 Set_Directly_Designated_Type
2145 (Etype
(Current_Scope
), Available_View
(Etyp
));
2151 -- If this is the proper body of a stub, we must verify that the stub
2152 -- conforms to the body, and to the previous spec if one was present.
2153 -- we know already that the body conforms to that spec. This test is
2154 -- only required for subprograms that come from source.
2156 if Nkind
(Parent
(N
)) = N_Subunit
2157 and then Comes_From_Source
(N
)
2158 and then not Error_Posted
(Body_Id
)
2159 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
2160 N_Subprogram_Body_Stub
2163 Old_Id
: constant Entity_Id
:=
2165 (Specification
(Corresponding_Stub
(Parent
(N
))));
2167 Conformant
: Boolean := False;
2170 if No
(Spec_Id
) then
2171 Check_Fully_Conformant
(Body_Id
, Old_Id
);
2175 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
2177 if not Conformant
then
2179 -- The stub was taken to be a new declaration. Indicate
2180 -- that it lacks a body.
2182 Set_Has_Completion
(Old_Id
, False);
2188 Set_Has_Completion
(Body_Id
);
2189 Check_Eliminated
(Body_Id
);
2191 if Nkind
(N
) = N_Subprogram_Body_Stub
then
2194 elsif Present
(Spec_Id
)
2195 and then Expander_Active
2197 (Has_Pragma_Inline_Always
(Spec_Id
)
2198 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
))
2200 Build_Body_To_Inline
(N
, Spec_Id
);
2203 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2204 -- if its specification we have to install the private withed units.
2205 -- This holds for child units as well.
2207 if Is_Compilation_Unit
(Body_Id
)
2208 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
2210 Install_Private_With_Clauses
(Body_Id
);
2213 Check_Anonymous_Return
;
2215 -- Set the Protected_Formal field of each extra formal of the protected
2216 -- subprogram to reference the corresponding extra formal of the
2217 -- subprogram that implements it. For regular formals this occurs when
2218 -- the protected subprogram's declaration is expanded, but the extra
2219 -- formals don't get created until the subprogram is frozen. We need to
2220 -- do this before analyzing the protected subprogram's body so that any
2221 -- references to the original subprogram's extra formals will be changed
2222 -- refer to the implementing subprogram's formals (see Expand_Formal).
2224 if Present
(Spec_Id
)
2225 and then Is_Protected_Type
(Scope
(Spec_Id
))
2226 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
2229 Impl_Subp
: constant Entity_Id
:=
2230 Protected_Body_Subprogram
(Spec_Id
);
2231 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
2232 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
2234 while Present
(Prot_Ext_Formal
) loop
2235 pragma Assert
(Present
(Impl_Ext_Formal
));
2236 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
2237 Next_Formal_With_Extras
(Prot_Ext_Formal
);
2238 Next_Formal_With_Extras
(Impl_Ext_Formal
);
2243 -- Now we can go on to analyze the body
2245 HSS
:= Handled_Statement_Sequence
(N
);
2246 Set_Actual_Subtypes
(N
, Current_Scope
);
2248 -- Deal with preconditions and postconditions
2250 Process_PPCs
(N
, Spec_Id
, Body_Id
);
2252 -- Add a declaration for the Protection object, renaming declarations
2253 -- for discriminals and privals and finally a declaration for the entry
2254 -- family index (if applicable). This form of early expansion is done
2255 -- when the Expander is active because Install_Private_Data_Declarations
2256 -- references entities which were created during regular expansion.
2259 and then Comes_From_Source
(N
)
2260 and then Present
(Prot_Typ
)
2261 and then Present
(Spec_Id
)
2262 and then not Is_Eliminated
(Spec_Id
)
2264 Install_Private_Data_Declarations
2265 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
2268 -- Analyze the declarations (this call will analyze the precondition
2269 -- Check pragmas we prepended to the list, as well as the declaration
2270 -- of the _Postconditions procedure).
2272 Analyze_Declarations
(Declarations
(N
));
2274 -- Check completion, and analyze the statements
2277 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
2280 -- Deal with end of scope processing for the body
2282 Process_End_Label
(HSS
, 't', Current_Scope
);
2284 Check_Subprogram_Order
(N
);
2285 Set_Analyzed
(Body_Id
);
2287 -- If we have a separate spec, then the analysis of the declarations
2288 -- caused the entities in the body to be chained to the spec id, but
2289 -- we want them chained to the body id. Only the formal parameters
2290 -- end up chained to the spec id in this case.
2292 if Present
(Spec_Id
) then
2294 -- We must conform to the categorization of our spec
2296 Validate_Categorization_Dependency
(N
, Spec_Id
);
2298 -- And if this is a child unit, the parent units must conform
2300 if Is_Child_Unit
(Spec_Id
) then
2301 Validate_Categorization_Dependency
2302 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
2305 -- Here is where we move entities from the spec to the body
2307 -- Case where there are entities that stay with the spec
2309 if Present
(Last_Real_Spec_Entity
) then
2311 -- No body entities (happens when the only real spec entities
2312 -- come from precondition and postcondition pragmas)
2314 if No
(Last_Entity
(Body_Id
)) then
2316 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
2318 -- Body entities present (formals), so chain stuff past them
2322 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
2325 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
2326 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2327 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
2329 -- Case where there are no spec entities, in this case there can
2330 -- be no body entities either, so just move everything.
2333 pragma Assert
(No
(Last_Entity
(Body_Id
)));
2334 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
2335 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2336 Set_First_Entity
(Spec_Id
, Empty
);
2337 Set_Last_Entity
(Spec_Id
, Empty
);
2341 -- If function, check return statements
2343 if Nkind
(Body_Spec
) = N_Function_Specification
then
2348 if Present
(Spec_Id
) then
2354 if Return_Present
(Id
) then
2355 Check_Returns
(HSS
, 'F', Missing_Ret
);
2358 Set_Has_Missing_Return
(Id
);
2361 elsif not Is_Machine_Code_Subprogram
(Id
)
2362 and then not Body_Deleted
2364 Error_Msg_N
("missing RETURN statement in function body", N
);
2368 -- If procedure with No_Return, check returns
2370 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2371 and then Present
(Spec_Id
)
2372 and then No_Return
(Spec_Id
)
2374 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2377 -- Now we are going to check for variables that are never modified in
2378 -- the body of the procedure. But first we deal with a special case
2379 -- where we want to modify this check. If the body of the subprogram
2380 -- starts with a raise statement or its equivalent, or if the body
2381 -- consists entirely of a null statement, then it is pretty obvious
2382 -- that it is OK to not reference the parameters. For example, this
2383 -- might be the following common idiom for a stubbed function:
2384 -- statement of the procedure raises an exception. In particular this
2385 -- deals with the common idiom of a stubbed function, which might
2386 -- appear as something like
2388 -- function F (A : Integer) return Some_Type;
2391 -- raise Program_Error;
2395 -- Here the purpose of X is simply to satisfy the annoying requirement
2396 -- in Ada that there be at least one return, and we certainly do not
2397 -- want to go posting warnings on X that it is not initialized! On
2398 -- the other hand, if X is entirely unreferenced that should still
2401 -- What we do is to detect these cases, and if we find them, flag the
2402 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2403 -- suppress unwanted warnings. For the case of the function stub above
2404 -- we have a special test to set X as apparently assigned to suppress
2411 -- Skip initial labels (for one thing this occurs when we are in
2412 -- front end ZCX mode, but in any case it is irrelevant), and also
2413 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2415 Stm
:= First
(Statements
(HSS
));
2416 while Nkind
(Stm
) = N_Label
2417 or else Nkind
(Stm
) in N_Push_xxx_Label
2422 -- Do the test on the original statement before expansion
2425 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
2428 -- If explicit raise statement, turn on flag
2430 if Nkind
(Ostm
) = N_Raise_Statement
then
2431 Set_Trivial_Subprogram
(Stm
);
2433 -- If null statement, and no following statements, turn on flag
2435 elsif Nkind
(Stm
) = N_Null_Statement
2436 and then Comes_From_Source
(Stm
)
2437 and then No
(Next
(Stm
))
2439 Set_Trivial_Subprogram
(Stm
);
2441 -- Check for explicit call cases which likely raise an exception
2443 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
2444 if Is_Entity_Name
(Name
(Ostm
)) then
2446 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
2449 -- If the procedure is marked No_Return, then likely it
2450 -- raises an exception, but in any case it is not coming
2451 -- back here, so turn on the flag.
2453 if Ekind
(Ent
) = E_Procedure
2454 and then No_Return
(Ent
)
2456 Set_Trivial_Subprogram
(Stm
);
2464 -- Check for variables that are never modified
2470 -- If there is a separate spec, then transfer Never_Set_In_Source
2471 -- flags from out parameters to the corresponding entities in the
2472 -- body. The reason we do that is we want to post error flags on
2473 -- the body entities, not the spec entities.
2475 if Present
(Spec_Id
) then
2476 E1
:= First_Entity
(Spec_Id
);
2477 while Present
(E1
) loop
2478 if Ekind
(E1
) = E_Out_Parameter
then
2479 E2
:= First_Entity
(Body_Id
);
2480 while Present
(E2
) loop
2481 exit when Chars
(E1
) = Chars
(E2
);
2485 if Present
(E2
) then
2486 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
2494 -- Check references in body unless it was deleted. Note that the
2495 -- check of Body_Deleted here is not just for efficiency, it is
2496 -- necessary to avoid junk warnings on formal parameters.
2498 if not Body_Deleted
then
2499 Check_References
(Body_Id
);
2502 end Analyze_Subprogram_Body
;
2504 ------------------------------------
2505 -- Analyze_Subprogram_Declaration --
2506 ------------------------------------
2508 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
2509 Designator
: constant Entity_Id
:=
2510 Analyze_Subprogram_Specification
(Specification
(N
));
2511 Scop
: constant Entity_Id
:= Current_Scope
;
2513 -- Start of processing for Analyze_Subprogram_Declaration
2516 Generate_Definition
(Designator
);
2518 -- Check for RCI unit subprogram declarations for illegal inlined
2519 -- subprograms and subprograms having access parameter or limited
2520 -- parameter without Read and Write attributes (RM E.2.3(12-13)).
2522 Validate_RCI_Subprogram_Declaration
(N
);
2526 Defining_Entity
(N
),
2527 " Analyze subprogram spec: ");
2529 if Debug_Flag_C
then
2530 Write_Str
("==== Compiling subprogram spec ");
2531 Write_Name
(Chars
(Designator
));
2532 Write_Str
(" from ");
2533 Write_Location
(Sloc
(N
));
2537 New_Overloaded_Entity
(Designator
);
2538 Check_Delayed_Subprogram
(Designator
);
2540 -- If the type of the first formal of the current subprogram is a non
2541 -- generic tagged private type , mark the subprogram as being a private
2544 if Present
(First_Formal
(Designator
)) then
2546 Formal_Typ
: constant Entity_Id
:=
2547 Etype
(First_Formal
(Designator
));
2549 Set_Is_Private_Primitive
(Designator
,
2550 Is_Tagged_Type
(Formal_Typ
)
2551 and then Is_Private_Type
(Formal_Typ
)
2552 and then not Is_Generic_Actual_Type
(Formal_Typ
));
2556 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2559 if Ada_Version
>= Ada_05
2560 and then Comes_From_Source
(N
)
2561 and then Is_Dispatching_Operation
(Designator
)
2568 if Has_Controlling_Result
(Designator
) then
2569 Etyp
:= Etype
(Designator
);
2572 E
:= First_Entity
(Designator
);
2574 and then Is_Formal
(E
)
2575 and then not Is_Controlling_Formal
(E
)
2583 if Is_Access_Type
(Etyp
) then
2584 Etyp
:= Directly_Designated_Type
(Etyp
);
2587 if Is_Interface
(Etyp
)
2588 and then not Is_Abstract_Subprogram
(Designator
)
2589 and then not (Ekind
(Designator
) = E_Procedure
2590 and then Null_Present
(Specification
(N
)))
2592 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
2594 ("(Ada 2005) interface subprogram % must be abstract or null",
2600 -- What is the following code for, it used to be
2602 -- ??? Set_Suppress_Elaboration_Checks
2603 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2605 -- The following seems equivalent, but a bit dubious
2607 if Elaboration_Checks_Suppressed
(Designator
) then
2608 Set_Kill_Elaboration_Checks
(Designator
);
2611 if Scop
/= Standard_Standard
2612 and then not Is_Child_Unit
(Designator
)
2614 Set_Categorization_From_Scope
(Designator
, Scop
);
2616 -- For a compilation unit, check for library-unit pragmas
2618 Push_Scope
(Designator
);
2619 Set_Categorization_From_Pragmas
(N
);
2620 Validate_Categorization_Dependency
(N
, Designator
);
2624 -- For a compilation unit, set body required. This flag will only be
2625 -- reset if a valid Import or Interface pragma is processed later on.
2627 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2628 Set_Body_Required
(Parent
(N
), True);
2630 if Ada_Version
>= Ada_05
2631 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
2632 and then Null_Present
(Specification
(N
))
2635 ("null procedure cannot be declared at library level", N
);
2639 Generate_Reference_To_Formals
(Designator
);
2640 Check_Eliminated
(Designator
);
2642 -- Ada 2005: if procedure is declared with "is null" qualifier,
2643 -- it requires no body.
2645 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2646 and then Null_Present
(Specification
(N
))
2648 Set_Has_Completion
(Designator
);
2649 Set_Is_Inlined
(Designator
);
2651 if Is_Protected_Type
(Current_Scope
) then
2653 ("protected operation cannot be a null procedure", N
);
2656 end Analyze_Subprogram_Declaration
;
2658 --------------------------------------
2659 -- Analyze_Subprogram_Specification --
2660 --------------------------------------
2662 -- Reminder: N here really is a subprogram specification (not a subprogram
2663 -- declaration). This procedure is called to analyze the specification in
2664 -- both subprogram bodies and subprogram declarations (specs).
2666 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
2667 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2668 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
2670 -- Start of processing for Analyze_Subprogram_Specification
2673 Generate_Definition
(Designator
);
2675 if Nkind
(N
) = N_Function_Specification
then
2676 Set_Ekind
(Designator
, E_Function
);
2677 Set_Mechanism
(Designator
, Default_Mechanism
);
2680 Set_Ekind
(Designator
, E_Procedure
);
2681 Set_Etype
(Designator
, Standard_Void_Type
);
2684 -- Introduce new scope for analysis of the formals and the return type
2686 Set_Scope
(Designator
, Current_Scope
);
2688 if Present
(Formals
) then
2689 Push_Scope
(Designator
);
2690 Process_Formals
(Formals
, N
);
2692 -- Ada 2005 (AI-345): If this is an overriding operation of an
2693 -- inherited interface operation, and the controlling type is
2694 -- a synchronized type, replace the type with its corresponding
2695 -- record, to match the proper signature of an overriding operation.
2697 if Ada_Version
>= Ada_05
then
2700 Formal_Typ
: Entity_Id
;
2701 Rec_Typ
: Entity_Id
;
2704 Formal
:= First_Formal
(Designator
);
2705 while Present
(Formal
) loop
2706 Formal_Typ
:= Etype
(Formal
);
2708 if Is_Concurrent_Type
(Formal_Typ
)
2709 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2711 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
2713 if Present
(Interfaces
(Rec_Typ
)) then
2714 Set_Etype
(Formal
, Rec_Typ
);
2718 Next_Formal
(Formal
);
2725 elsif Nkind
(N
) = N_Function_Specification
then
2726 Analyze_Return_Type
(N
);
2729 if Nkind
(N
) = N_Function_Specification
then
2730 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
2731 Valid_Operator_Definition
(Designator
);
2734 May_Need_Actuals
(Designator
);
2736 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2737 -- the subprogram is abstract also. This does not apply to renaming
2738 -- declarations, where abstractness is inherited.
2739 -- In case of primitives associated with abstract interface types
2740 -- the check is applied later (see Analyze_Subprogram_Declaration).
2742 if Is_Abstract_Type
(Etype
(Designator
))
2743 and then not Is_Interface
(Etype
(Designator
))
2744 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
2745 and then Nkind
(Parent
(N
)) /=
2746 N_Abstract_Subprogram_Declaration
2748 (Nkind
(Parent
(N
))) /= N_Formal_Abstract_Subprogram_Declaration
2751 ("function that returns abstract type must be abstract", N
);
2756 end Analyze_Subprogram_Specification
;
2758 --------------------------
2759 -- Build_Body_To_Inline --
2760 --------------------------
2762 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
) is
2763 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
2764 Original_Body
: Node_Id
;
2765 Body_To_Analyze
: Node_Id
;
2766 Max_Size
: constant := 10;
2767 Stat_Count
: Integer := 0;
2769 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean;
2770 -- Check for declarations that make inlining not worthwhile
2772 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean;
2773 -- Check for statements that make inlining not worthwhile: any tasking
2774 -- statement, nested at any level. Keep track of total number of
2775 -- elementary statements, as a measure of acceptable size.
2777 function Has_Pending_Instantiation
return Boolean;
2778 -- If some enclosing body contains instantiations that appear before the
2779 -- corresponding generic body, the enclosing body has a freeze node so
2780 -- that it can be elaborated after the generic itself. This might
2781 -- conflict with subsequent inlinings, so that it is unsafe to try to
2782 -- inline in such a case.
2784 function Has_Single_Return
return Boolean;
2785 -- In general we cannot inline functions that return unconstrained type.
2786 -- However, we can handle such functions if all return statements return
2787 -- a local variable that is the only declaration in the body of the
2788 -- function. In that case the call can be replaced by that local
2789 -- variable as is done for other inlined calls.
2791 procedure Remove_Pragmas
;
2792 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2793 -- parameter has no meaning when the body is inlined and the formals
2794 -- are rewritten. Remove it from body to inline. The analysis of the
2795 -- non-inlined body will handle the pragma properly.
2797 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean;
2798 -- If the body of the subprogram includes a call that returns an
2799 -- unconstrained type, the secondary stack is involved, and it
2800 -- is not worth inlining.
2802 ------------------------------
2803 -- Has_Excluded_Declaration --
2804 ------------------------------
2806 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean is
2809 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean;
2810 -- Nested subprograms make a given body ineligible for inlining, but
2811 -- we make an exception for instantiations of unchecked conversion.
2812 -- The body has not been analyzed yet, so check the name, and verify
2813 -- that the visible entity with that name is the predefined unit.
2815 -----------------------------
2816 -- Is_Unchecked_Conversion --
2817 -----------------------------
2819 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean is
2820 Id
: constant Node_Id
:= Name
(D
);
2824 if Nkind
(Id
) = N_Identifier
2825 and then Chars
(Id
) = Name_Unchecked_Conversion
2827 Conv
:= Current_Entity
(Id
);
2829 elsif Nkind_In
(Id
, N_Selected_Component
, N_Expanded_Name
)
2830 and then Chars
(Selector_Name
(Id
)) = Name_Unchecked_Conversion
2832 Conv
:= Current_Entity
(Selector_Name
(Id
));
2837 return Present
(Conv
)
2838 and then Is_Predefined_File_Name
2839 (Unit_File_Name
(Get_Source_Unit
(Conv
)))
2840 and then Is_Intrinsic_Subprogram
(Conv
);
2841 end Is_Unchecked_Conversion
;
2843 -- Start of processing for Has_Excluded_Declaration
2847 while Present
(D
) loop
2848 if (Nkind
(D
) = N_Function_Instantiation
2849 and then not Is_Unchecked_Conversion
(D
))
2850 or else Nkind_In
(D
, N_Protected_Type_Declaration
,
2851 N_Package_Declaration
,
2852 N_Package_Instantiation
,
2854 N_Procedure_Instantiation
,
2855 N_Task_Type_Declaration
)
2858 ("cannot inline & (non-allowed declaration)?", D
, Subp
);
2866 end Has_Excluded_Declaration
;
2868 ----------------------------
2869 -- Has_Excluded_Statement --
2870 ----------------------------
2872 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean is
2878 while Present
(S
) loop
2879 Stat_Count
:= Stat_Count
+ 1;
2881 if Nkind_In
(S
, N_Abort_Statement
,
2882 N_Asynchronous_Select
,
2883 N_Conditional_Entry_Call
,
2884 N_Delay_Relative_Statement
,
2885 N_Delay_Until_Statement
,
2890 ("cannot inline & (non-allowed statement)?", S
, Subp
);
2893 elsif Nkind
(S
) = N_Block_Statement
then
2894 if Present
(Declarations
(S
))
2895 and then Has_Excluded_Declaration
(Declarations
(S
))
2899 elsif Present
(Handled_Statement_Sequence
(S
))
2902 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
2904 Has_Excluded_Statement
2905 (Statements
(Handled_Statement_Sequence
(S
))))
2910 elsif Nkind
(S
) = N_Case_Statement
then
2911 E
:= First
(Alternatives
(S
));
2912 while Present
(E
) loop
2913 if Has_Excluded_Statement
(Statements
(E
)) then
2920 elsif Nkind
(S
) = N_If_Statement
then
2921 if Has_Excluded_Statement
(Then_Statements
(S
)) then
2925 if Present
(Elsif_Parts
(S
)) then
2926 E
:= First
(Elsif_Parts
(S
));
2927 while Present
(E
) loop
2928 if Has_Excluded_Statement
(Then_Statements
(E
)) then
2935 if Present
(Else_Statements
(S
))
2936 and then Has_Excluded_Statement
(Else_Statements
(S
))
2941 elsif Nkind
(S
) = N_Loop_Statement
2942 and then Has_Excluded_Statement
(Statements
(S
))
2951 end Has_Excluded_Statement
;
2953 -------------------------------
2954 -- Has_Pending_Instantiation --
2955 -------------------------------
2957 function Has_Pending_Instantiation
return Boolean is
2962 while Present
(S
) loop
2963 if Is_Compilation_Unit
(S
)
2964 or else Is_Child_Unit
(S
)
2967 elsif Ekind
(S
) = E_Package
2968 and then Has_Forward_Instantiation
(S
)
2977 end Has_Pending_Instantiation
;
2979 ------------------------
2980 -- Has_Single_Return --
2981 ------------------------
2983 function Has_Single_Return
return Boolean is
2984 Return_Statement
: Node_Id
:= Empty
;
2986 function Check_Return
(N
: Node_Id
) return Traverse_Result
;
2992 function Check_Return
(N
: Node_Id
) return Traverse_Result
is
2994 if Nkind
(N
) = N_Simple_Return_Statement
then
2995 if Present
(Expression
(N
))
2996 and then Is_Entity_Name
(Expression
(N
))
2998 if No
(Return_Statement
) then
2999 Return_Statement
:= N
;
3002 elsif Chars
(Expression
(N
)) =
3003 Chars
(Expression
(Return_Statement
))
3012 -- Expression has wrong form
3022 function Check_All_Returns
is new Traverse_Func
(Check_Return
);
3024 -- Start of processing for Has_Single_Return
3027 return Check_All_Returns
(N
) = OK
3028 and then Present
(Declarations
(N
))
3029 and then Present
(First
(Declarations
(N
)))
3030 and then Chars
(Expression
(Return_Statement
)) =
3031 Chars
(Defining_Identifier
(First
(Declarations
(N
))));
3032 end Has_Single_Return
;
3034 --------------------
3035 -- Remove_Pragmas --
3036 --------------------
3038 procedure Remove_Pragmas
is
3043 Decl
:= First
(Declarations
(Body_To_Analyze
));
3044 while Present
(Decl
) loop
3047 if Nkind
(Decl
) = N_Pragma
3048 and then (Pragma_Name
(Decl
) = Name_Unreferenced
3050 Pragma_Name
(Decl
) = Name_Unmodified
)
3059 --------------------------
3060 -- Uses_Secondary_Stack --
3061 --------------------------
3063 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean is
3064 function Check_Call
(N
: Node_Id
) return Traverse_Result
;
3065 -- Look for function calls that return an unconstrained type
3071 function Check_Call
(N
: Node_Id
) return Traverse_Result
is
3073 if Nkind
(N
) = N_Function_Call
3074 and then Is_Entity_Name
(Name
(N
))
3075 and then Is_Composite_Type
(Etype
(Entity
(Name
(N
))))
3076 and then not Is_Constrained
(Etype
(Entity
(Name
(N
))))
3079 ("cannot inline & (call returns unconstrained type)?",
3087 function Check_Calls
is new Traverse_Func
(Check_Call
);
3090 return Check_Calls
(Bod
) = Abandon
;
3091 end Uses_Secondary_Stack
;
3093 -- Start of processing for Build_Body_To_Inline
3096 if Nkind
(Decl
) = N_Subprogram_Declaration
3097 and then Present
(Body_To_Inline
(Decl
))
3099 return; -- Done already.
3101 -- Functions that return unconstrained composite types require
3102 -- secondary stack handling, and cannot currently be inlined, unless
3103 -- all return statements return a local variable that is the first
3104 -- local declaration in the body.
3106 elsif Ekind
(Subp
) = E_Function
3107 and then not Is_Scalar_Type
(Etype
(Subp
))
3108 and then not Is_Access_Type
(Etype
(Subp
))
3109 and then not Is_Constrained
(Etype
(Subp
))
3111 if not Has_Single_Return
then
3113 ("cannot inline & (unconstrained return type)?", N
, Subp
);
3117 -- Ditto for functions that return controlled types, where controlled
3118 -- actions interfere in complex ways with inlining.
3120 elsif Ekind
(Subp
) = E_Function
3121 and then Needs_Finalization
(Etype
(Subp
))
3124 ("cannot inline & (controlled return type)?", N
, Subp
);
3128 if Present
(Declarations
(N
))
3129 and then Has_Excluded_Declaration
(Declarations
(N
))
3134 if Present
(Handled_Statement_Sequence
(N
)) then
3135 if Present
(Exception_Handlers
(Handled_Statement_Sequence
(N
))) then
3137 ("cannot inline& (exception handler)?",
3138 First
(Exception_Handlers
(Handled_Statement_Sequence
(N
))),
3142 Has_Excluded_Statement
3143 (Statements
(Handled_Statement_Sequence
(N
)))
3149 -- We do not inline a subprogram that is too large, unless it is
3150 -- marked Inline_Always. This pragma does not suppress the other
3151 -- checks on inlining (forbidden declarations, handlers, etc).
3153 if Stat_Count
> Max_Size
3154 and then not Has_Pragma_Inline_Always
(Subp
)
3156 Cannot_Inline
("cannot inline& (body too large)?", N
, Subp
);
3160 if Has_Pending_Instantiation
then
3162 ("cannot inline& (forward instance within enclosing body)?",
3167 -- Within an instance, the body to inline must be treated as a nested
3168 -- generic, so that the proper global references are preserved.
3170 -- Note that we do not do this at the library level, because it is not
3171 -- needed, and furthermore this causes trouble if front end inlining
3172 -- is activated (-gnatN).
3174 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3175 Save_Env
(Scope
(Current_Scope
), Scope
(Current_Scope
));
3176 Original_Body
:= Copy_Generic_Node
(N
, Empty
, True);
3178 Original_Body
:= Copy_Separate_Tree
(N
);
3181 -- We need to capture references to the formals in order to substitute
3182 -- the actuals at the point of inlining, i.e. instantiation. To treat
3183 -- the formals as globals to the body to inline, we nest it within
3184 -- a dummy parameterless subprogram, declared within the real one.
3185 -- To avoid generating an internal name (which is never public, and
3186 -- which affects serial numbers of other generated names), we use
3187 -- an internal symbol that cannot conflict with user declarations.
3189 Set_Parameter_Specifications
(Specification
(Original_Body
), No_List
);
3190 Set_Defining_Unit_Name
3191 (Specification
(Original_Body
),
3192 Make_Defining_Identifier
(Sloc
(N
), Name_uParent
));
3193 Set_Corresponding_Spec
(Original_Body
, Empty
);
3195 Body_To_Analyze
:= Copy_Generic_Node
(Original_Body
, Empty
, False);
3197 -- Set return type of function, which is also global and does not need
3200 if Ekind
(Subp
) = E_Function
then
3201 Set_Result_Definition
(Specification
(Body_To_Analyze
),
3202 New_Occurrence_Of
(Etype
(Subp
), Sloc
(N
)));
3205 if No
(Declarations
(N
)) then
3206 Set_Declarations
(N
, New_List
(Body_To_Analyze
));
3208 Append
(Body_To_Analyze
, Declarations
(N
));
3211 Expander_Mode_Save_And_Set
(False);
3214 Analyze
(Body_To_Analyze
);
3215 Push_Scope
(Defining_Entity
(Body_To_Analyze
));
3216 Save_Global_References
(Original_Body
);
3218 Remove
(Body_To_Analyze
);
3220 Expander_Mode_Restore
;
3222 -- Restore environment if previously saved
3224 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3228 -- If secondary stk used there is no point in inlining. We have
3229 -- already issued the warning in this case, so nothing to do.
3231 if Uses_Secondary_Stack
(Body_To_Analyze
) then
3235 Set_Body_To_Inline
(Decl
, Original_Body
);
3236 Set_Ekind
(Defining_Entity
(Original_Body
), Ekind
(Subp
));
3237 Set_Is_Inlined
(Subp
);
3238 end Build_Body_To_Inline
;
3244 procedure Cannot_Inline
(Msg
: String; N
: Node_Id
; Subp
: Entity_Id
) is
3246 -- Do not emit warning if this is a predefined unit which is not
3247 -- the main unit. With validity checks enabled, some predefined
3248 -- subprograms may contain nested subprograms and become ineligible
3251 if Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(Subp
)))
3252 and then not In_Extended_Main_Source_Unit
(Subp
)
3256 elsif Has_Pragma_Inline_Always
(Subp
) then
3258 -- Remove last character (question mark) to make this into an error,
3259 -- because the Inline_Always pragma cannot be obeyed.
3261 Error_Msg_NE
(Msg
(Msg
'First .. Msg
'Last - 1), N
, Subp
);
3263 elsif Ineffective_Inline_Warnings
then
3264 Error_Msg_NE
(Msg
, N
, Subp
);
3268 -----------------------
3269 -- Check_Conformance --
3270 -----------------------
3272 procedure Check_Conformance
3273 (New_Id
: Entity_Id
;
3275 Ctype
: Conformance_Type
;
3277 Conforms
: out Boolean;
3278 Err_Loc
: Node_Id
:= Empty
;
3279 Get_Inst
: Boolean := False;
3280 Skip_Controlling_Formals
: Boolean := False)
3282 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
3283 -- Post error message for conformance error on given node. Two messages
3284 -- are output. The first points to the previous declaration with a
3285 -- general "no conformance" message. The second is the detailed reason,
3286 -- supplied as Msg. The parameter N provide information for a possible
3287 -- & insertion in the message, and also provides the location for
3288 -- posting the message in the absence of a specified Err_Loc location.
3290 -----------------------
3291 -- Conformance_Error --
3292 -----------------------
3294 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
3301 if No
(Err_Loc
) then
3307 Error_Msg_Sloc
:= Sloc
(Old_Id
);
3310 when Type_Conformant
=>
3312 ("not type conformant with declaration#!", Enode
);
3314 when Mode_Conformant
=>
3315 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3317 ("not mode conformant with operation inherited#!",
3321 ("not mode conformant with declaration#!", Enode
);
3324 when Subtype_Conformant
=>
3325 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3327 ("not subtype conformant with operation inherited#!",
3331 ("not subtype conformant with declaration#!", Enode
);
3334 when Fully_Conformant
=>
3335 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3337 ("not fully conformant with operation inherited#!",
3341 ("not fully conformant with declaration#!", Enode
);
3345 Error_Msg_NE
(Msg
, Enode
, N
);
3347 end Conformance_Error
;
3351 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
3352 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
3353 Old_Formal
: Entity_Id
;
3354 New_Formal
: Entity_Id
;
3355 Access_Types_Match
: Boolean;
3356 Old_Formal_Base
: Entity_Id
;
3357 New_Formal_Base
: Entity_Id
;
3359 -- Start of processing for Check_Conformance
3364 -- We need a special case for operators, since they don't appear
3367 if Ctype
= Type_Conformant
then
3368 if Ekind
(New_Id
) = E_Operator
3369 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
3375 -- If both are functions/operators, check return types conform
3377 if Old_Type
/= Standard_Void_Type
3378 and then New_Type
/= Standard_Void_Type
3381 -- If we are checking interface conformance we omit controlling
3382 -- arguments and result, because we are only checking the conformance
3383 -- of the remaining parameters.
3385 if Has_Controlling_Result
(Old_Id
)
3386 and then Has_Controlling_Result
(New_Id
)
3387 and then Skip_Controlling_Formals
3391 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
3392 Conformance_Error
("\return type does not match!", New_Id
);
3396 -- Ada 2005 (AI-231): In case of anonymous access types check the
3397 -- null-exclusion and access-to-constant attributes match.
3399 if Ada_Version
>= Ada_05
3400 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
3402 (Can_Never_Be_Null
(Old_Type
)
3403 /= Can_Never_Be_Null
(New_Type
)
3404 or else Is_Access_Constant
(Etype
(Old_Type
))
3405 /= Is_Access_Constant
(Etype
(New_Type
)))
3407 Conformance_Error
("\return type does not match!", New_Id
);
3411 -- If either is a function/operator and the other isn't, error
3413 elsif Old_Type
/= Standard_Void_Type
3414 or else New_Type
/= Standard_Void_Type
3416 Conformance_Error
("\functions can only match functions!", New_Id
);
3420 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3421 -- If this is a renaming as body, refine error message to indicate that
3422 -- the conflict is with the original declaration. If the entity is not
3423 -- frozen, the conventions don't have to match, the one of the renamed
3424 -- entity is inherited.
3426 if Ctype
>= Subtype_Conformant
then
3427 if Convention
(Old_Id
) /= Convention
(New_Id
) then
3429 if not Is_Frozen
(New_Id
) then
3432 elsif Present
(Err_Loc
)
3433 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
3434 and then Present
(Corresponding_Spec
(Err_Loc
))
3436 Error_Msg_Name_1
:= Chars
(New_Id
);
3438 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
3440 Conformance_Error
("\prior declaration for% has convention %!");
3443 Conformance_Error
("\calling conventions do not match!");
3448 elsif Is_Formal_Subprogram
(Old_Id
)
3449 or else Is_Formal_Subprogram
(New_Id
)
3451 Conformance_Error
("\formal subprograms not allowed!");
3456 -- Deal with parameters
3458 -- Note: we use the entity information, rather than going directly
3459 -- to the specification in the tree. This is not only simpler, but
3460 -- absolutely necessary for some cases of conformance tests between
3461 -- operators, where the declaration tree simply does not exist!
3463 Old_Formal
:= First_Formal
(Old_Id
);
3464 New_Formal
:= First_Formal
(New_Id
);
3466 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
3467 if Is_Controlling_Formal
(Old_Formal
)
3468 and then Is_Controlling_Formal
(New_Formal
)
3469 and then Skip_Controlling_Formals
3471 goto Skip_Controlling_Formal
;
3474 if Ctype
= Fully_Conformant
then
3476 -- Names must match. Error message is more accurate if we do
3477 -- this before checking that the types of the formals match.
3479 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
3480 Conformance_Error
("\name & does not match!", New_Formal
);
3482 -- Set error posted flag on new formal as well to stop
3483 -- junk cascaded messages in some cases.
3485 Set_Error_Posted
(New_Formal
);
3490 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3491 -- case occurs whenever a subprogram is being renamed and one of its
3492 -- parameters imposes a null exclusion. For example:
3494 -- type T is null record;
3495 -- type Acc_T is access T;
3496 -- subtype Acc_T_Sub is Acc_T;
3498 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3499 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3502 Old_Formal_Base
:= Etype
(Old_Formal
);
3503 New_Formal_Base
:= Etype
(New_Formal
);
3506 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
3507 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
3510 Access_Types_Match
:= Ada_Version
>= Ada_05
3512 -- Ensure that this rule is only applied when New_Id is a
3513 -- renaming of Old_Id.
3515 and then Nkind
(Parent
(Parent
(New_Id
))) =
3516 N_Subprogram_Renaming_Declaration
3517 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
3518 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
3519 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
3521 -- Now handle the allowed access-type case
3523 and then Is_Access_Type
(Old_Formal_Base
)
3524 and then Is_Access_Type
(New_Formal_Base
)
3526 -- The type kinds must match. The only exception occurs with
3527 -- multiple generics of the form:
3530 -- type F is private; type A is private;
3531 -- type F_Ptr is access F; type A_Ptr is access A;
3532 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3533 -- package F_Pack is ... package A_Pack is
3534 -- package F_Inst is
3535 -- new F_Pack (A, A_Ptr, A_P);
3537 -- When checking for conformance between the parameters of A_P
3538 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3539 -- because the compiler has transformed A_Ptr into a subtype of
3540 -- F_Ptr. We catch this case in the code below.
3542 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
3544 (Is_Generic_Type
(Old_Formal_Base
)
3545 and then Is_Generic_Type
(New_Formal_Base
)
3546 and then Is_Internal
(New_Formal_Base
)
3547 and then Etype
(Etype
(New_Formal_Base
)) =
3549 and then Directly_Designated_Type
(Old_Formal_Base
) =
3550 Directly_Designated_Type
(New_Formal_Base
)
3551 and then ((Is_Itype
(Old_Formal_Base
)
3552 and then Can_Never_Be_Null
(Old_Formal_Base
))
3554 (Is_Itype
(New_Formal_Base
)
3555 and then Can_Never_Be_Null
(New_Formal_Base
)));
3557 -- Types must always match. In the visible part of an instance,
3558 -- usual overloading rules for dispatching operations apply, and
3559 -- we check base types (not the actual subtypes).
3561 if In_Instance_Visible_Part
3562 and then Is_Dispatching_Operation
(New_Id
)
3564 if not Conforming_Types
3565 (T1
=> Base_Type
(Etype
(Old_Formal
)),
3566 T2
=> Base_Type
(Etype
(New_Formal
)),
3568 Get_Inst
=> Get_Inst
)
3569 and then not Access_Types_Match
3571 Conformance_Error
("\type of & does not match!", New_Formal
);
3575 elsif not Conforming_Types
3576 (T1
=> Old_Formal_Base
,
3577 T2
=> New_Formal_Base
,
3579 Get_Inst
=> Get_Inst
)
3580 and then not Access_Types_Match
3582 Conformance_Error
("\type of & does not match!", New_Formal
);
3586 -- For mode conformance, mode must match
3588 if Ctype
>= Mode_Conformant
then
3589 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
3590 Conformance_Error
("\mode of & does not match!", New_Formal
);
3593 -- Part of mode conformance for access types is having the same
3594 -- constant modifier.
3596 elsif Access_Types_Match
3597 and then Is_Access_Constant
(Old_Formal_Base
) /=
3598 Is_Access_Constant
(New_Formal_Base
)
3601 ("\constant modifier does not match!", New_Formal
);
3606 if Ctype
>= Subtype_Conformant
then
3608 -- Ada 2005 (AI-231): In case of anonymous access types check
3609 -- the null-exclusion and access-to-constant attributes must
3612 if Ada_Version
>= Ada_05
3613 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
3614 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
3616 (Can_Never_Be_Null
(Old_Formal
) /=
3617 Can_Never_Be_Null
(New_Formal
)
3619 Is_Access_Constant
(Etype
(Old_Formal
)) /=
3620 Is_Access_Constant
(Etype
(New_Formal
)))
3622 -- It is allowed to omit the null-exclusion in case of stream
3623 -- attribute subprograms. We recognize stream subprograms
3624 -- through their TSS-generated suffix.
3627 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
3629 if TSS_Name
/= TSS_Stream_Read
3630 and then TSS_Name
/= TSS_Stream_Write
3631 and then TSS_Name
/= TSS_Stream_Input
3632 and then TSS_Name
/= TSS_Stream_Output
3635 ("\type of & does not match!", New_Formal
);
3642 -- Full conformance checks
3644 if Ctype
= Fully_Conformant
then
3646 -- We have checked already that names match
3648 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
3650 -- Check default expressions for in parameters
3653 NewD
: constant Boolean :=
3654 Present
(Default_Value
(New_Formal
));
3655 OldD
: constant Boolean :=
3656 Present
(Default_Value
(Old_Formal
));
3658 if NewD
or OldD
then
3660 -- The old default value has been analyzed because the
3661 -- current full declaration will have frozen everything
3662 -- before. The new default value has not been analyzed,
3663 -- so analyze it now before we check for conformance.
3666 Push_Scope
(New_Id
);
3667 Preanalyze_Spec_Expression
3668 (Default_Value
(New_Formal
), Etype
(New_Formal
));
3672 if not (NewD
and OldD
)
3673 or else not Fully_Conformant_Expressions
3674 (Default_Value
(Old_Formal
),
3675 Default_Value
(New_Formal
))
3678 ("\default expression for & does not match!",
3687 -- A couple of special checks for Ada 83 mode. These checks are
3688 -- skipped if either entity is an operator in package Standard,
3689 -- or if either old or new instance is not from the source program.
3691 if Ada_Version
= Ada_83
3692 and then Sloc
(Old_Id
) > Standard_Location
3693 and then Sloc
(New_Id
) > Standard_Location
3694 and then Comes_From_Source
(Old_Id
)
3695 and then Comes_From_Source
(New_Id
)
3698 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
3699 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
3702 -- Explicit IN must be present or absent in both cases. This
3703 -- test is required only in the full conformance case.
3705 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
3706 and then Ctype
= Fully_Conformant
3709 ("\(Ada 83) IN must appear in both declarations",
3714 -- Grouping (use of comma in param lists) must be the same
3715 -- This is where we catch a misconformance like:
3718 -- A : Integer; B : Integer
3720 -- which are represented identically in the tree except
3721 -- for the setting of the flags More_Ids and Prev_Ids.
3723 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
3724 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
3727 ("\grouping of & does not match!", New_Formal
);
3733 -- This label is required when skipping controlling formals
3735 <<Skip_Controlling_Formal
>>
3737 Next_Formal
(Old_Formal
);
3738 Next_Formal
(New_Formal
);
3741 if Present
(Old_Formal
) then
3742 Conformance_Error
("\too few parameters!");
3745 elsif Present
(New_Formal
) then
3746 Conformance_Error
("\too many parameters!", New_Formal
);
3749 end Check_Conformance
;
3751 -----------------------
3752 -- Check_Conventions --
3753 -----------------------
3755 procedure Check_Conventions
(Typ
: Entity_Id
) is
3756 Ifaces_List
: Elist_Id
;
3758 procedure Check_Convention
(Op
: Entity_Id
);
3759 -- Verify that the convention of inherited dispatching operation Op is
3760 -- consistent among all subprograms it overrides. In order to minimize
3761 -- the search, Search_From is utilized to designate a specific point in
3762 -- the list rather than iterating over the whole list once more.
3764 ----------------------
3765 -- Check_Convention --
3766 ----------------------
3768 procedure Check_Convention
(Op
: Entity_Id
) is
3769 Iface_Elmt
: Elmt_Id
;
3770 Iface_Prim_Elmt
: Elmt_Id
;
3771 Iface_Prim
: Entity_Id
;
3774 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
3775 while Present
(Iface_Elmt
) loop
3777 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
3778 while Present
(Iface_Prim_Elmt
) loop
3779 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
3781 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
3782 and then Convention
(Iface_Prim
) /= Convention
(Op
)
3785 ("inconsistent conventions in primitive operations", Typ
);
3787 Error_Msg_Name_1
:= Chars
(Op
);
3788 Error_Msg_Name_2
:= Get_Convention_Name
(Convention
(Op
));
3789 Error_Msg_Sloc
:= Sloc
(Op
);
3791 if Comes_From_Source
(Op
) then
3792 if not Is_Overriding_Operation
(Op
) then
3793 Error_Msg_N
("\\primitive % defined #", Typ
);
3795 Error_Msg_N
("\\overriding operation % with " &
3796 "convention % defined #", Typ
);
3799 else pragma Assert
(Present
(Alias
(Op
)));
3800 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
3801 Error_Msg_N
("\\inherited operation % with " &
3802 "convention % defined #", Typ
);
3805 Error_Msg_Name_1
:= Chars
(Op
);
3807 Get_Convention_Name
(Convention
(Iface_Prim
));
3808 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
3809 Error_Msg_N
("\\overridden operation % with " &
3810 "convention % defined #", Typ
);
3812 -- Avoid cascading errors
3817 Next_Elmt
(Iface_Prim_Elmt
);
3820 Next_Elmt
(Iface_Elmt
);
3822 end Check_Convention
;
3826 Prim_Op
: Entity_Id
;
3827 Prim_Op_Elmt
: Elmt_Id
;
3829 -- Start of processing for Check_Conventions
3832 if not Has_Interfaces
(Typ
) then
3836 Collect_Interfaces
(Typ
, Ifaces_List
);
3838 -- The algorithm checks every overriding dispatching operation against
3839 -- all the corresponding overridden dispatching operations, detecting
3840 -- differences in conventions.
3842 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
3843 while Present
(Prim_Op_Elmt
) loop
3844 Prim_Op
:= Node
(Prim_Op_Elmt
);
3846 -- A small optimization: skip the predefined dispatching operations
3847 -- since they always have the same convention.
3849 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
3850 Check_Convention
(Prim_Op
);
3853 Next_Elmt
(Prim_Op_Elmt
);
3855 end Check_Conventions
;
3857 ------------------------------
3858 -- Check_Delayed_Subprogram --
3859 ------------------------------
3861 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
3864 procedure Possible_Freeze
(T
: Entity_Id
);
3865 -- T is the type of either a formal parameter or of the return type.
3866 -- If T is not yet frozen and needs a delayed freeze, then the
3867 -- subprogram itself must be delayed.
3869 ---------------------
3870 -- Possible_Freeze --
3871 ---------------------
3873 procedure Possible_Freeze
(T
: Entity_Id
) is
3875 if Has_Delayed_Freeze
(T
)
3876 and then not Is_Frozen
(T
)
3878 Set_Has_Delayed_Freeze
(Designator
);
3880 elsif Is_Access_Type
(T
)
3881 and then Has_Delayed_Freeze
(Designated_Type
(T
))
3882 and then not Is_Frozen
(Designated_Type
(T
))
3884 Set_Has_Delayed_Freeze
(Designator
);
3886 end Possible_Freeze
;
3888 -- Start of processing for Check_Delayed_Subprogram
3891 -- Never need to freeze abstract subprogram
3893 if Ekind
(Designator
) /= E_Subprogram_Type
3894 and then Is_Abstract_Subprogram
(Designator
)
3898 -- Need delayed freeze if return type itself needs a delayed
3899 -- freeze and is not yet frozen.
3901 Possible_Freeze
(Etype
(Designator
));
3902 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
3904 -- Need delayed freeze if any of the formal types themselves need
3905 -- a delayed freeze and are not yet frozen.
3907 F
:= First_Formal
(Designator
);
3908 while Present
(F
) loop
3909 Possible_Freeze
(Etype
(F
));
3910 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
3915 -- Mark functions that return by reference. Note that it cannot be
3916 -- done for delayed_freeze subprograms because the underlying
3917 -- returned type may not be known yet (for private types)
3919 if not Has_Delayed_Freeze
(Designator
)
3920 and then Expander_Active
3923 Typ
: constant Entity_Id
:= Etype
(Designator
);
3924 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
3927 if Is_Inherently_Limited_Type
(Typ
) then
3928 Set_Returns_By_Ref
(Designator
);
3930 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
3931 Set_Returns_By_Ref
(Designator
);
3935 end Check_Delayed_Subprogram
;
3937 ------------------------------------
3938 -- Check_Discriminant_Conformance --
3939 ------------------------------------
3941 procedure Check_Discriminant_Conformance
3946 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
3947 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
3948 New_Discr_Id
: Entity_Id
;
3949 New_Discr_Type
: Entity_Id
;
3951 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
3952 -- Post error message for conformance error on given node. Two messages
3953 -- are output. The first points to the previous declaration with a
3954 -- general "no conformance" message. The second is the detailed reason,
3955 -- supplied as Msg. The parameter N provide information for a possible
3956 -- & insertion in the message.
3958 -----------------------
3959 -- Conformance_Error --
3960 -----------------------
3962 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
3964 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
3965 Error_Msg_N
("not fully conformant with declaration#!", N
);
3966 Error_Msg_NE
(Msg
, N
, N
);
3967 end Conformance_Error
;
3969 -- Start of processing for Check_Discriminant_Conformance
3972 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
3974 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
3976 -- The subtype mark of the discriminant on the full type has not
3977 -- been analyzed so we do it here. For an access discriminant a new
3980 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
3982 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
3985 Analyze
(Discriminant_Type
(New_Discr
));
3986 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
3989 if not Conforming_Types
3990 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
3992 Conformance_Error
("type of & does not match!", New_Discr_Id
);
3995 -- Treat the new discriminant as an occurrence of the old one,
3996 -- for navigation purposes, and fill in some semantic
3997 -- information, for completeness.
3999 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
4000 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
4001 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
4006 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
4007 Conformance_Error
("name & does not match!", New_Discr_Id
);
4011 -- Default expressions must match
4014 NewD
: constant Boolean :=
4015 Present
(Expression
(New_Discr
));
4016 OldD
: constant Boolean :=
4017 Present
(Expression
(Parent
(Old_Discr
)));
4020 if NewD
or OldD
then
4022 -- The old default value has been analyzed and expanded,
4023 -- because the current full declaration will have frozen
4024 -- everything before. The new default values have not been
4025 -- expanded, so expand now to check conformance.
4028 Preanalyze_Spec_Expression
4029 (Expression
(New_Discr
), New_Discr_Type
);
4032 if not (NewD
and OldD
)
4033 or else not Fully_Conformant_Expressions
4034 (Expression
(Parent
(Old_Discr
)),
4035 Expression
(New_Discr
))
4039 ("default expression for & does not match!",
4046 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4048 if Ada_Version
= Ada_83
then
4050 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
4053 -- Grouping (use of comma in param lists) must be the same
4054 -- This is where we catch a misconformance like:
4057 -- A : Integer; B : Integer
4059 -- which are represented identically in the tree except
4060 -- for the setting of the flags More_Ids and Prev_Ids.
4062 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
4063 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
4066 ("grouping of & does not match!", New_Discr_Id
);
4072 Next_Discriminant
(Old_Discr
);
4076 if Present
(Old_Discr
) then
4077 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
4080 elsif Present
(New_Discr
) then
4082 ("too many discriminants!", Defining_Identifier
(New_Discr
));
4085 end Check_Discriminant_Conformance
;
4087 ----------------------------
4088 -- Check_Fully_Conformant --
4089 ----------------------------
4091 procedure Check_Fully_Conformant
4092 (New_Id
: Entity_Id
;
4094 Err_Loc
: Node_Id
:= Empty
)
4097 pragma Warnings
(Off
, Result
);
4100 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
4101 end Check_Fully_Conformant
;
4103 ---------------------------
4104 -- Check_Mode_Conformant --
4105 ---------------------------
4107 procedure Check_Mode_Conformant
4108 (New_Id
: Entity_Id
;
4110 Err_Loc
: Node_Id
:= Empty
;
4111 Get_Inst
: Boolean := False)
4114 pragma Warnings
(Off
, Result
);
4117 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
4118 end Check_Mode_Conformant
;
4120 --------------------------------
4121 -- Check_Overriding_Indicator --
4122 --------------------------------
4124 procedure Check_Overriding_Indicator
4126 Overridden_Subp
: Entity_Id
;
4127 Is_Primitive
: Boolean)
4133 -- No overriding indicator for literals
4135 if Ekind
(Subp
) = E_Enumeration_Literal
then
4138 elsif Ekind
(Subp
) = E_Entry
then
4139 Decl
:= Parent
(Subp
);
4142 Decl
:= Unit_Declaration_Node
(Subp
);
4145 if Nkind_In
(Decl
, N_Subprogram_Body
,
4146 N_Subprogram_Body_Stub
,
4147 N_Subprogram_Declaration
,
4148 N_Abstract_Subprogram_Declaration
,
4149 N_Subprogram_Renaming_Declaration
)
4151 Spec
:= Specification
(Decl
);
4153 elsif Nkind
(Decl
) = N_Entry_Declaration
then
4160 if Present
(Overridden_Subp
) then
4161 if Must_Not_Override
(Spec
) then
4162 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
4164 if Ekind
(Subp
) = E_Entry
then
4166 ("entry & overrides inherited operation #", Spec
, Subp
);
4169 ("subprogram & overrides inherited operation #", Spec
, Subp
);
4172 elsif Is_Subprogram
(Subp
) then
4173 Set_Is_Overriding_Operation
(Subp
);
4176 if Style_Check
and then not Must_Override
(Spec
) then
4177 Style
.Missing_Overriding
(Decl
, Subp
);
4180 -- If Subp is an operator, it may override a predefined operation.
4181 -- In that case overridden_subp is empty because of our implicit
4182 -- representation for predefined operators. We have to check whether the
4183 -- signature of Subp matches that of a predefined operator. Note that
4184 -- first argument provides the name of the operator, and the second
4185 -- argument the signature that may match that of a standard operation.
4186 -- If the indicator is overriding, then the operator must match a
4187 -- predefined signature, because we know already that there is no
4188 -- explicit overridden operation.
4190 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
4192 if Must_Not_Override
(Spec
) then
4193 if not Is_Primitive
then
4195 ("overriding indicator only allowed "
4196 & "if subprogram is primitive", Subp
);
4198 elsif Operator_Matches_Spec
(Subp
, Subp
) then
4200 ("subprogram & overrides predefined operator ", Spec
, Subp
);
4203 elsif Must_Override
(Spec
) then
4204 if Is_Overriding_Operation
(Subp
) then
4205 Set_Is_Overriding_Operation
(Subp
);
4207 elsif not Operator_Matches_Spec
(Subp
, Subp
) then
4208 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4211 elsif not Error_Posted
(Subp
)
4212 and then Style_Check
4213 and then Operator_Matches_Spec
(Subp
, Subp
)
4215 not Is_Predefined_File_Name
4216 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
4218 Set_Is_Overriding_Operation
(Subp
);
4219 Style
.Missing_Overriding
(Decl
, Subp
);
4222 elsif Must_Override
(Spec
) then
4223 if Ekind
(Subp
) = E_Entry
then
4224 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
4226 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4229 -- If the operation is marked "not overriding" and it's not primitive
4230 -- then an error is issued, unless this is an operation of a task or
4231 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4232 -- has been specified have already been checked above.
4234 elsif Must_Not_Override
(Spec
)
4235 and then not Is_Primitive
4236 and then Ekind
(Subp
) /= E_Entry
4237 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4240 ("overriding indicator only allowed if subprogram is primitive",
4244 end Check_Overriding_Indicator
;
4250 -- Note: this procedure needs to know far too much about how the expander
4251 -- messes with exceptions. The use of the flag Exception_Junk and the
4252 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4253 -- works, but is not very clean. It would be better if the expansion
4254 -- routines would leave Original_Node working nicely, and we could use
4255 -- Original_Node here to ignore all the peculiar expander messing ???
4257 procedure Check_Returns
4261 Proc
: Entity_Id
:= Empty
)
4265 procedure Check_Statement_Sequence
(L
: List_Id
);
4266 -- Internal recursive procedure to check a list of statements for proper
4267 -- termination by a return statement (or a transfer of control or a
4268 -- compound statement that is itself internally properly terminated).
4270 ------------------------------
4271 -- Check_Statement_Sequence --
4272 ------------------------------
4274 procedure Check_Statement_Sequence
(L
: List_Id
) is
4279 Raise_Exception_Call
: Boolean;
4280 -- Set True if statement sequence terminated by Raise_Exception call
4281 -- or a Reraise_Occurrence call.
4284 Raise_Exception_Call
:= False;
4286 -- Get last real statement
4288 Last_Stm
:= Last
(L
);
4290 -- Deal with digging out exception handler statement sequences that
4291 -- have been transformed by the local raise to goto optimization.
4292 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4293 -- optimization has occurred, we are looking at something like:
4296 -- original stmts in block
4300 -- goto L1; | omitted if No_Exception_Propagation
4305 -- goto L3; -- skip handler when exception not raised
4307 -- <<L1>> -- target label for local exception
4321 -- and what we have to do is to dig out the estmts1 and estmts2
4322 -- sequences (which were the original sequences of statements in
4323 -- the exception handlers) and check them.
4325 if Nkind
(Last_Stm
) = N_Label
4326 and then Exception_Junk
(Last_Stm
)
4332 exit when Nkind
(Stm
) /= N_Block_Statement
;
4333 exit when not Exception_Junk
(Stm
);
4336 exit when Nkind
(Stm
) /= N_Label
;
4337 exit when not Exception_Junk
(Stm
);
4338 Check_Statement_Sequence
4339 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
4344 exit when Nkind
(Stm
) /= N_Goto_Statement
;
4345 exit when not Exception_Junk
(Stm
);
4349 -- Don't count pragmas
4351 while Nkind
(Last_Stm
) = N_Pragma
4353 -- Don't count call to SS_Release (can happen after Raise_Exception)
4356 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
4358 Nkind
(Name
(Last_Stm
)) = N_Identifier
4360 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
4362 -- Don't count exception junk
4365 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
4367 N_Object_Declaration
)
4368 and then Exception_Junk
(Last_Stm
))
4369 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
4370 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
4375 -- Here we have the "real" last statement
4377 Kind
:= Nkind
(Last_Stm
);
4379 -- Transfer of control, OK. Note that in the No_Return procedure
4380 -- case, we already diagnosed any explicit return statements, so
4381 -- we can treat them as OK in this context.
4383 if Is_Transfer
(Last_Stm
) then
4386 -- Check cases of explicit non-indirect procedure calls
4388 elsif Kind
= N_Procedure_Call_Statement
4389 and then Is_Entity_Name
(Name
(Last_Stm
))
4391 -- Check call to Raise_Exception procedure which is treated
4392 -- specially, as is a call to Reraise_Occurrence.
4394 -- We suppress the warning in these cases since it is likely that
4395 -- the programmer really does not expect to deal with the case
4396 -- of Null_Occurrence, and thus would find a warning about a
4397 -- missing return curious, and raising Program_Error does not
4398 -- seem such a bad behavior if this does occur.
4400 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4401 -- behavior will be to raise Constraint_Error (see AI-329).
4403 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
4405 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
4407 Raise_Exception_Call
:= True;
4409 -- For Raise_Exception call, test first argument, if it is
4410 -- an attribute reference for a 'Identity call, then we know
4411 -- that the call cannot possibly return.
4414 Arg
: constant Node_Id
:=
4415 Original_Node
(First_Actual
(Last_Stm
));
4417 if Nkind
(Arg
) = N_Attribute_Reference
4418 and then Attribute_Name
(Arg
) = Name_Identity
4425 -- If statement, need to look inside if there is an else and check
4426 -- each constituent statement sequence for proper termination.
4428 elsif Kind
= N_If_Statement
4429 and then Present
(Else_Statements
(Last_Stm
))
4431 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
4432 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4434 if Present
(Elsif_Parts
(Last_Stm
)) then
4436 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
4439 while Present
(Elsif_Part
) loop
4440 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
4448 -- Case statement, check each case for proper termination
4450 elsif Kind
= N_Case_Statement
then
4454 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
4455 while Present
(Case_Alt
) loop
4456 Check_Statement_Sequence
(Statements
(Case_Alt
));
4457 Next_Non_Pragma
(Case_Alt
);
4463 -- Block statement, check its handled sequence of statements
4465 elsif Kind
= N_Block_Statement
then
4471 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
4480 -- Loop statement. If there is an iteration scheme, we can definitely
4481 -- fall out of the loop. Similarly if there is an exit statement, we
4482 -- can fall out. In either case we need a following return.
4484 elsif Kind
= N_Loop_Statement
then
4485 if Present
(Iteration_Scheme
(Last_Stm
))
4486 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
4490 -- A loop with no exit statement or iteration scheme is either
4491 -- an infinite loop, or it has some other exit (raise/return).
4492 -- In either case, no warning is required.
4498 -- Timed entry call, check entry call and delay alternatives
4500 -- Note: in expanded code, the timed entry call has been converted
4501 -- to a set of expanded statements on which the check will work
4502 -- correctly in any case.
4504 elsif Kind
= N_Timed_Entry_Call
then
4506 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4507 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
4510 -- If statement sequence of entry call alternative is missing,
4511 -- then we can definitely fall through, and we post the error
4512 -- message on the entry call alternative itself.
4514 if No
(Statements
(ECA
)) then
4517 -- If statement sequence of delay alternative is missing, then
4518 -- we can definitely fall through, and we post the error
4519 -- message on the delay alternative itself.
4521 -- Note: if both ECA and DCA are missing the return, then we
4522 -- post only one message, should be enough to fix the bugs.
4523 -- If not we will get a message next time on the DCA when the
4526 elsif No
(Statements
(DCA
)) then
4529 -- Else check both statement sequences
4532 Check_Statement_Sequence
(Statements
(ECA
));
4533 Check_Statement_Sequence
(Statements
(DCA
));
4538 -- Conditional entry call, check entry call and else part
4540 -- Note: in expanded code, the conditional entry call has been
4541 -- converted to a set of expanded statements on which the check
4542 -- will work correctly in any case.
4544 elsif Kind
= N_Conditional_Entry_Call
then
4546 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4549 -- If statement sequence of entry call alternative is missing,
4550 -- then we can definitely fall through, and we post the error
4551 -- message on the entry call alternative itself.
4553 if No
(Statements
(ECA
)) then
4556 -- Else check statement sequence and else part
4559 Check_Statement_Sequence
(Statements
(ECA
));
4560 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4566 -- If we fall through, issue appropriate message
4569 if not Raise_Exception_Call
then
4571 ("?RETURN statement missing following this statement!",
4574 ("\?Program_Error may be raised at run time!",
4578 -- Note: we set Err even though we have not issued a warning
4579 -- because we still have a case of a missing return. This is
4580 -- an extremely marginal case, probably will never be noticed
4581 -- but we might as well get it right.
4585 -- Otherwise we have the case of a procedure marked No_Return
4588 if not Raise_Exception_Call
then
4590 ("?implied return after this statement " &
4591 "will raise Program_Error",
4594 ("\?procedure & is marked as No_Return!",
4599 RE
: constant Node_Id
:=
4600 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
4601 Reason
=> PE_Implicit_Return
);
4603 Insert_After
(Last_Stm
, RE
);
4607 end Check_Statement_Sequence
;
4609 -- Start of processing for Check_Returns
4613 Check_Statement_Sequence
(Statements
(HSS
));
4615 if Present
(Exception_Handlers
(HSS
)) then
4616 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
4617 while Present
(Handler
) loop
4618 Check_Statement_Sequence
(Statements
(Handler
));
4619 Next_Non_Pragma
(Handler
);
4624 ----------------------------
4625 -- Check_Subprogram_Order --
4626 ----------------------------
4628 procedure Check_Subprogram_Order
(N
: Node_Id
) is
4630 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
4631 -- This is used to check if S1 > S2 in the sense required by this
4632 -- test, for example nameab < namec, but name2 < name10.
4634 -----------------------------
4635 -- Subprogram_Name_Greater --
4636 -----------------------------
4638 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
4643 -- Remove trailing numeric parts
4646 while S1
(L1
) in '0' .. '9' loop
4651 while S2
(L2
) in '0' .. '9' loop
4655 -- If non-numeric parts non-equal, that's decisive
4657 if S1
(S1
'First .. L1
) < S2
(S2
'First .. L2
) then
4660 elsif S1
(S1
'First .. L1
) > S2
(S2
'First .. L2
) then
4663 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4664 -- that a missing suffix is treated as numeric zero in this test.
4668 while L1
< S1
'Last loop
4670 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
4674 while L2
< S2
'Last loop
4676 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
4681 end Subprogram_Name_Greater
;
4683 -- Start of processing for Check_Subprogram_Order
4686 -- Check body in alpha order if this is option
4689 and then Style_Check_Order_Subprograms
4690 and then Nkind
(N
) = N_Subprogram_Body
4691 and then Comes_From_Source
(N
)
4692 and then In_Extended_Main_Source_Unit
(N
)
4696 renames Scope_Stack
.Table
4697 (Scope_Stack
.Last
).Last_Subprogram_Name
;
4699 Body_Id
: constant Entity_Id
:=
4700 Defining_Entity
(Specification
(N
));
4703 Get_Decoded_Name_String
(Chars
(Body_Id
));
4706 if Subprogram_Name_Greater
4707 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
4709 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
4715 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
4718 end Check_Subprogram_Order;
4720 ------------------------------
4721 -- Check_Subtype_Conformant --
4722 ------------------------------
4724 procedure Check_Subtype_Conformant
4725 (New_Id : Entity_Id;
4727 Err_Loc : Node_Id := Empty;
4728 Skip_Controlling_Formals : Boolean := False)
4731 pragma Warnings (Off, Result);
4734 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
4735 Skip_Controlling_Formals => Skip_Controlling_Formals);
4736 end Check_Subtype_Conformant;
4738 ---------------------------
4739 -- Check_Type_Conformant --
4740 ---------------------------
4742 procedure Check_Type_Conformant
4743 (New_Id : Entity_Id;
4745 Err_Loc : Node_Id := Empty)
4748 pragma Warnings (Off, Result);
4751 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
4752 end Check_Type_Conformant;
4754 ----------------------
4755 -- Conforming_Types --
4756 ----------------------
4758 function Conforming_Types
4761 Ctype : Conformance_Type;
4762 Get_Inst : Boolean := False) return Boolean
4764 Type_1 : Entity_Id := T1;
4765 Type_2 : Entity_Id := T2;
4766 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
4768 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
4769 -- If neither T1 nor T2 are generic actual types, or if they are in
4770 -- different scopes (e.g. parent and child instances), then verify that
4771 -- the base types are equal. Otherwise T1 and T2 must be on the same
4772 -- subtype chain. The whole purpose of this procedure is to prevent
4773 -- spurious ambiguities in an instantiation that may arise if two
4774 -- distinct generic types are instantiated with the same actual.
4776 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
4777 -- An access parameter can designate an incomplete type. If the
4778 -- incomplete type is the limited view of a type from a limited_
4779 -- with_clause, check whether the non-limited view is available. If
4780 -- it is a (non-limited) incomplete type, get the full view.
4782 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
4783 -- Returns True if and only if either T1 denotes a limited view of T2
4784 -- or T2 denotes a limited view of T1. This can arise when the limited
4785 -- with view of a type is used in a subprogram declaration and the
4786 -- subprogram body is in the scope of a regular with clause for the
4787 -- same unit. In such a case, the two type entities can be considered
4788 -- identical for purposes of conformance checking.
4790 ----------------------
4791 -- Base_Types_Match --
4792 ----------------------
4794 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
4799 elsif Base_Type (T1) = Base_Type (T2) then
4801 -- The following is too permissive. A more precise test should
4802 -- check that the generic actual is an ancestor subtype of the
4805 return not Is_Generic_Actual_Type (T1)
4806 or else not Is_Generic_Actual_Type (T2)
4807 or else Scope (T1) /= Scope (T2);
4812 end Base_Types_Match;
4814 --------------------------
4815 -- Find_Designated_Type --
4816 --------------------------
4818 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
4822 Desig := Directly_Designated_Type (T);
4824 if Ekind (Desig) = E_Incomplete_Type then
4826 -- If regular incomplete type, get full view if available
4828 if Present (Full_View (Desig)) then
4829 Desig := Full_View (Desig);
4831 -- If limited view of a type, get non-limited view if available,
4832 -- and check again for a regular incomplete type.
4834 elsif Present (Non_Limited_View (Desig)) then
4835 Desig := Get_Full_View (Non_Limited_View (Desig));
4840 end Find_Designated_Type;
4842 -------------------------------
4843 -- Matches_Limited_With_View --
4844 -------------------------------
4846 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
4848 -- In some cases a type imported through a limited_with clause, and
4849 -- its nonlimited view are both visible, for example in an anonymous
4850 -- access-to-class-wide type in a formal. Both entities designate the
4853 if From_With_Type (T1)
4854 and then T2 = Available_View (T1)
4858 elsif From_With_Type (T2)
4859 and then T1 = Available_View (T2)
4866 end Matches_Limited_With_View;
4868 -- Start of processing for Conforming_Types
4871 -- The context is an instance association for a formal
4872 -- access-to-subprogram type; the formal parameter types require
4873 -- mapping because they may denote other formal parameters of the
4877 Type_1 := Get_Instance_Of (T1);
4878 Type_2 := Get_Instance_Of (T2);
4881 -- If one of the types is a view of the other introduced by a limited
4882 -- with clause, treat these as conforming for all purposes.
4884 if Matches_Limited_With_View (T1, T2) then
4887 elsif Base_Types_Match (Type_1, Type_2) then
4888 return Ctype <= Mode_Conformant
4889 or else Subtypes_Statically_Match (Type_1, Type_2);
4891 elsif Is_Incomplete_Or_Private_Type (Type_1)
4892 and then Present (Full_View (Type_1))
4893 and then Base_Types_Match (Full_View (Type_1), Type_2)
4895 return Ctype <= Mode_Conformant
4896 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
4898 elsif Ekind (Type_2) = E_Incomplete_Type
4899 and then Present (Full_View (Type_2))
4900 and then Base_Types_Match (Type_1, Full_View (Type_2))
4902 return Ctype <= Mode_Conformant
4903 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4905 elsif Is_Private_Type (Type_2)
4906 and then In_Instance
4907 and then Present (Full_View (Type_2))
4908 and then Base_Types_Match (Type_1, Full_View (Type_2))
4910 return Ctype <= Mode_Conformant
4911 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
4914 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
4915 -- treated recursively because they carry a signature.
4917 Are_Anonymous_Access_To_Subprogram_Types :=
4918 Ekind (Type_1) = Ekind (Type_2)
4920 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
4922 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
4924 -- Test anonymous access type case. For this case, static subtype
4925 -- matching is required for mode conformance (RM 6.3.1(15)). We check
4926 -- the base types because we may have built internal subtype entities
4927 -- to handle null-excluding types (see Process_Formals).
4929 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
4931 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
4932 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
4935 Desig_1 : Entity_Id;
4936 Desig_2 : Entity_Id;
4939 -- In Ada2005, access constant indicators must match for
4940 -- subtype conformance.
4942 if Ada_Version >= Ada_05
4943 and then Ctype >= Subtype_Conformant
4945 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
4950 Desig_1 := Find_Designated_Type (Type_1);
4952 Desig_2 := Find_Designated_Type (Type_2);
4954 -- If the context is an instance association for a formal
4955 -- access-to-subprogram type; formal access parameter designated
4956 -- types require mapping because they may denote other formal
4957 -- parameters of the generic unit.
4960 Desig_1 := Get_Instance_Of (Desig_1);
4961 Desig_2 := Get_Instance_Of (Desig_2);
4964 -- It is possible for a Class_Wide_Type to be introduced for an
4965 -- incomplete type, in which case there is a separate class_ wide
4966 -- type for the full view. The types conform if their Etypes
4967 -- conform, i.e. one may be the full view of the other. This can
4968 -- only happen in the context of an access parameter, other uses
4969 -- of an incomplete Class_Wide_Type are illegal.
4971 if Is_Class_Wide_Type (Desig_1)
4972 and then Is_Class_Wide_Type (Desig_2)
4976 (Etype (Base_Type (Desig_1)),
4977 Etype (Base_Type (Desig_2)), Ctype);
4979 elsif Are_Anonymous_Access_To_Subprogram_Types then
4980 if Ada_Version < Ada_05 then
4981 return Ctype = Type_Conformant
4983 Subtypes_Statically_Match (Desig_1, Desig_2);
4985 -- We must check the conformance of the signatures themselves
4989 Conformant : Boolean;
4992 (Desig_1, Desig_2, Ctype, False, Conformant);
4998 return Base_Type (Desig_1) = Base_Type (Desig_2)
4999 and then (Ctype = Type_Conformant
5001 Subtypes_Statically_Match (Desig_1, Desig_2));
5005 -- Otherwise definitely no match
5008 if ((Ekind (Type_1) = E_Anonymous_Access_Type
5009 and then Is_Access_Type (Type_2))
5010 or else (Ekind (Type_2) = E_Anonymous_Access_Type
5011 and then Is_Access_Type (Type_1)))
5014 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
5016 May_Hide_Profile := True;
5021 end Conforming_Types;
5023 --------------------------
5024 -- Create_Extra_Formals --
5025 --------------------------
5027 procedure Create_Extra_Formals (E : Entity_Id) is
5029 First_Extra : Entity_Id := Empty;
5030 Last_Extra : Entity_Id;
5031 Formal_Type : Entity_Id;
5032 P_Formal : Entity_Id := Empty;
5034 function Add_Extra_Formal
5035 (Assoc_Entity : Entity_Id;
5038 Suffix : String) return Entity_Id;
5039 -- Add an extra formal to the current list of formals and extra formals.
5040 -- The extra formal is added to the end of the list of extra formals,
5041 -- and also returned as the result. These formals are always of mode IN.
5042 -- The new formal has the type Typ, is declared in Scope, and its name
5043 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5045 ----------------------
5046 -- Add_Extra_Formal --
5047 ----------------------
5049 function Add_Extra_Formal
5050 (Assoc_Entity : Entity_Id;
5053 Suffix : String) return Entity_Id
5055 EF : constant Entity_Id :=
5056 Make_Defining_Identifier (Sloc (Assoc_Entity),
5057 Chars => New_External_Name (Chars (Assoc_Entity),
5061 -- A little optimization. Never generate an extra formal for the
5062 -- _init operand of an initialization procedure, since it could
5065 if Chars (Formal) = Name_uInit then
5069 Set_Ekind (EF, E_In_Parameter);
5070 Set_Actual_Subtype (EF, Typ);
5071 Set_Etype (EF, Typ);
5072 Set_Scope (EF, Scope);
5073 Set_Mechanism (EF, Default_Mechanism);
5074 Set_Formal_Validity (EF);
5076 if No (First_Extra) then
5078 Set_Extra_Formals (Scope, First_Extra);
5081 if Present (Last_Extra) then
5082 Set_Extra_Formal (Last_Extra, EF);
5088 end Add_Extra_Formal;
5090 -- Start of processing for Create_Extra_Formals
5093 -- We never generate extra formals if expansion is not active
5094 -- because we don't need them unless we are generating code.
5096 if not Expander_Active then
5100 -- If this is a derived subprogram then the subtypes of the parent
5101 -- subprogram's formal parameters will be used to to determine the need
5102 -- for extra formals.
5104 if Is_Overloadable (E) and then Present (Alias (E)) then
5105 P_Formal := First_Formal (Alias (E));
5108 Last_Extra := Empty;
5109 Formal := First_Formal (E);
5110 while Present (Formal) loop
5111 Last_Extra := Formal;
5112 Next_Formal (Formal);
5115 -- If Extra_formals were already created, don't do it again. This
5116 -- situation may arise for subprogram types created as part of
5117 -- dispatching calls (see Expand_Dispatching_Call)
5119 if Present (Last_Extra) and then
5120 Present (Extra_Formal (Last_Extra))
5125 -- If the subprogram is a predefined dispatching subprogram then don't
5126 -- generate any extra constrained or accessibility level formals. In
5127 -- general we suppress these for internal subprograms (by not calling
5128 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5129 -- generated stream attributes do get passed through because extra
5130 -- build-in-place formals are needed in some cases (limited 'Input
).
5132 if Is_Predefined_Dispatching_Operation
(E
) then
5133 goto Test_For_BIP_Extras
;
5136 Formal
:= First_Formal
(E
);
5137 while Present
(Formal
) loop
5139 -- Create extra formal for supporting the attribute 'Constrained.
5140 -- The case of a private type view without discriminants also
5141 -- requires the extra formal if the underlying type has defaulted
5144 if Ekind
(Formal
) /= E_In_Parameter
then
5145 if Present
(P_Formal
) then
5146 Formal_Type
:= Etype
(P_Formal
);
5148 Formal_Type
:= Etype
(Formal
);
5151 -- Do not produce extra formals for Unchecked_Union parameters.
5152 -- Jump directly to the end of the loop.
5154 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
5155 goto Skip_Extra_Formal_Generation
;
5158 if not Has_Discriminants
(Formal_Type
)
5159 and then Ekind
(Formal_Type
) in Private_Kind
5160 and then Present
(Underlying_Type
(Formal_Type
))
5162 Formal_Type
:= Underlying_Type
(Formal_Type
);
5165 if Has_Discriminants
(Formal_Type
)
5166 and then not Is_Constrained
(Formal_Type
)
5167 and then not Is_Indefinite_Subtype
(Formal_Type
)
5169 Set_Extra_Constrained
5170 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "F"));
5174 -- Create extra formal for supporting accessibility checking. This
5175 -- is done for both anonymous access formals and formals of named
5176 -- access types that are marked as controlling formals. The latter
5177 -- case can occur when Expand_Dispatching_Call creates a subprogram
5178 -- type and substitutes the types of access-to-class-wide actuals
5179 -- for the anonymous access-to-specific-type of controlling formals.
5180 -- Base_Type is applied because in cases where there is a null
5181 -- exclusion the formal may have an access subtype.
5183 -- This is suppressed if we specifically suppress accessibility
5184 -- checks at the package level for either the subprogram, or the
5185 -- package in which it resides. However, we do not suppress it
5186 -- simply if the scope has accessibility checks suppressed, since
5187 -- this could cause trouble when clients are compiled with a
5188 -- different suppression setting. The explicit checks at the
5189 -- package level are safe from this point of view.
5191 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
5192 or else (Is_Controlling_Formal
(Formal
)
5193 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
5195 (Explicit_Suppress
(E
, Accessibility_Check
)
5197 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
5200 or else Present
(Extra_Accessibility
(P_Formal
)))
5202 -- Temporary kludge: for now we avoid creating the extra formal
5203 -- for access parameters of protected operations because of
5204 -- problem with the case of internal protected calls. ???
5206 if Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Definition
5207 and then Nkind
(Parent
(Parent
(Parent
(E
)))) /= N_Protected_Body
5209 Set_Extra_Accessibility
5210 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "F"));
5214 -- This label is required when skipping extra formal generation for
5215 -- Unchecked_Union parameters.
5217 <<Skip_Extra_Formal_Generation
>>
5219 if Present
(P_Formal
) then
5220 Next_Formal
(P_Formal
);
5223 Next_Formal
(Formal
);
5226 <<Test_For_BIP_Extras
>>
5228 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5229 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5231 if Ada_Version
>= Ada_05
and then Is_Build_In_Place_Function
(E
) then
5233 Result_Subt
: constant Entity_Id
:= Etype
(E
);
5235 Discard
: Entity_Id
;
5236 pragma Warnings
(Off
, Discard
);
5239 -- In the case of functions with unconstrained result subtypes,
5240 -- add a 3-state formal indicating whether the return object is
5241 -- allocated by the caller (0), or should be allocated by the
5242 -- callee on the secondary stack (1) or in the global heap (2).
5243 -- For the moment we just use Natural for the type of this formal.
5244 -- Note that this formal isn't usually needed in the case where
5245 -- the result subtype is constrained, but it is needed when the
5246 -- function has a tagged result, because generally such functions
5247 -- can be called in a dispatching context and such calls must be
5248 -- handled like calls to a class-wide function.
5250 if not Is_Constrained
(Underlying_Type
(Result_Subt
))
5251 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5255 (E
, Standard_Natural
,
5256 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
5259 -- In the case of functions whose result type has controlled
5260 -- parts, we have an extra formal of type
5261 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5262 -- is, we are passing a pointer to a finalization list (which is
5263 -- itself a pointer). This extra formal is then passed along to
5264 -- Move_Final_List in case of successful completion of a return
5265 -- statement. We cannot pass an 'in out' parameter, because we
5266 -- need to update the finalization list during an abort-deferred
5267 -- region, rather than using copy-back after the function
5268 -- returns. This is true even if we are able to get away with
5269 -- having 'in out' parameters, which are normally illegal for
5270 -- functions. This formal is also needed when the function has
5273 if Needs_BIP_Final_List
(E
) then
5276 (E
, RTE
(RE_Finalizable_Ptr_Ptr
),
5277 E
, BIP_Formal_Suffix
(BIP_Final_List
));
5280 -- If the result type contains tasks, we have two extra formals:
5281 -- the master of the tasks to be created, and the caller's
5282 -- activation chain.
5284 if Has_Task
(Result_Subt
) then
5287 (E
, RTE
(RE_Master_Id
),
5288 E
, BIP_Formal_Suffix
(BIP_Master
));
5291 (E
, RTE
(RE_Activation_Chain_Access
),
5292 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
5295 -- All build-in-place functions get an extra formal that will be
5296 -- passed the address of the return object within the caller.
5299 Formal_Type
: constant Entity_Id
:=
5301 (E_Anonymous_Access_Type
, E
,
5302 Scope_Id
=> Scope
(E
));
5304 Set_Directly_Designated_Type
(Formal_Type
, Result_Subt
);
5305 Set_Etype
(Formal_Type
, Formal_Type
);
5306 Set_Depends_On_Private
5307 (Formal_Type
, Has_Private_Component
(Formal_Type
));
5308 Set_Is_Public
(Formal_Type
, Is_Public
(Scope
(Formal_Type
)));
5309 Set_Is_Access_Constant
(Formal_Type
, False);
5311 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5312 -- the designated type comes from the limited view (for
5313 -- back-end purposes).
5315 Set_From_With_Type
(Formal_Type
, From_With_Type
(Result_Subt
));
5317 Layout_Type
(Formal_Type
);
5321 (E
, Formal_Type
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
5325 end Create_Extra_Formals
;
5327 -----------------------------
5328 -- Enter_Overloaded_Entity --
5329 -----------------------------
5331 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
5332 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
5333 C_E
: Entity_Id
:= Current_Entity
(S
);
5337 Set_Has_Homonym
(E
);
5338 Set_Has_Homonym
(S
);
5341 Set_Is_Immediately_Visible
(S
);
5342 Set_Scope
(S
, Current_Scope
);
5344 -- Chain new entity if front of homonym in current scope, so that
5345 -- homonyms are contiguous.
5350 while Homonym
(C_E
) /= E
loop
5351 C_E
:= Homonym
(C_E
);
5354 Set_Homonym
(C_E
, S
);
5358 Set_Current_Entity
(S
);
5363 Append_Entity
(S
, Current_Scope
);
5364 Set_Public_Status
(S
);
5366 if Debug_Flag_E
then
5367 Write_Str
("New overloaded entity chain: ");
5368 Write_Name
(Chars
(S
));
5371 while Present
(E
) loop
5372 Write_Str
(" "); Write_Int
(Int
(E
));
5379 -- Generate warning for hiding
5382 and then Comes_From_Source
(S
)
5383 and then In_Extended_Main_Source_Unit
(S
)
5390 -- Warn unless genuine overloading
5392 if (not Is_Overloadable
(E
) or else Subtype_Conformant
(E
, S
))
5393 and then (Is_Immediately_Visible
(E
)
5395 Is_Potentially_Use_Visible
(S
))
5397 Error_Msg_Sloc
:= Sloc
(E
);
5398 Error_Msg_N
("declaration of & hides one#?", S
);
5402 end Enter_Overloaded_Entity
;
5404 -----------------------------
5405 -- Find_Corresponding_Spec --
5406 -----------------------------
5408 function Find_Corresponding_Spec
5410 Post_Error
: Boolean := True) return Entity_Id
5412 Spec
: constant Node_Id
:= Specification
(N
);
5413 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
5418 E
:= Current_Entity
(Designator
);
5419 while Present
(E
) loop
5421 -- We are looking for a matching spec. It must have the same scope,
5422 -- and the same name, and either be type conformant, or be the case
5423 -- of a library procedure spec and its body (which belong to one
5424 -- another regardless of whether they are type conformant or not).
5426 if Scope
(E
) = Current_Scope
then
5427 if Current_Scope
= Standard_Standard
5428 or else (Ekind
(E
) = Ekind
(Designator
)
5429 and then Type_Conformant
(E
, Designator
))
5431 -- Within an instantiation, we know that spec and body are
5432 -- subtype conformant, because they were subtype conformant
5433 -- in the generic. We choose the subtype-conformant entity
5434 -- here as well, to resolve spurious ambiguities in the
5435 -- instance that were not present in the generic (i.e. when
5436 -- two different types are given the same actual). If we are
5437 -- looking for a spec to match a body, full conformance is
5441 Set_Convention
(Designator
, Convention
(E
));
5443 if Nkind
(N
) = N_Subprogram_Body
5444 and then Present
(Homonym
(E
))
5445 and then not Fully_Conformant
(E
, Designator
)
5449 elsif not Subtype_Conformant
(E
, Designator
) then
5454 if not Has_Completion
(E
) then
5455 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
5456 Set_Corresponding_Spec
(N
, E
);
5459 Set_Has_Completion
(E
);
5462 elsif Nkind
(Parent
(N
)) = N_Subunit
then
5464 -- If this is the proper body of a subunit, the completion
5465 -- flag is set when analyzing the stub.
5469 -- If E is an internal function with a controlling result
5470 -- that was created for an operation inherited by a null
5471 -- extension, it may be overridden by a body without a previous
5472 -- spec (one more reason why these should be shunned). In that
5473 -- case remove the generated body, because the current one is
5474 -- the explicit overriding.
5476 elsif Ekind
(E
) = E_Function
5477 and then Ada_Version
>= Ada_05
5478 and then not Comes_From_Source
(E
)
5479 and then Has_Controlling_Result
(E
)
5480 and then Is_Null_Extension
(Etype
(E
))
5481 and then Comes_From_Source
(Spec
)
5483 Set_Has_Completion
(E
, False);
5485 if Expander_Active
then
5487 (Unit_Declaration_Node
5488 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
5491 -- If expansion is disabled, the wrapper function has not
5492 -- been generated, and this is the standard case of a late
5493 -- body overriding an inherited operation.
5499 -- If the body already exists, then this is an error unless
5500 -- the previous declaration is the implicit declaration of a
5501 -- derived subprogram, or this is a spurious overloading in an
5504 elsif No
(Alias
(E
))
5505 and then not Is_Intrinsic_Subprogram
(E
)
5506 and then not In_Instance
5509 Error_Msg_Sloc
:= Sloc
(E
);
5510 if Is_Imported
(E
) then
5512 ("body not allowed for imported subprogram & declared#",
5515 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
5519 -- Child units cannot be overloaded, so a conformance mismatch
5520 -- between body and a previous spec is an error.
5522 elsif Is_Child_Unit
(E
)
5524 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
5526 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
5531 ("body of child unit does not match previous declaration", N
);
5539 -- On exit, we know that no previous declaration of subprogram exists
5542 end Find_Corresponding_Spec
;
5544 ----------------------
5545 -- Fully_Conformant --
5546 ----------------------
5548 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
5551 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
5553 end Fully_Conformant
;
5555 ----------------------------------
5556 -- Fully_Conformant_Expressions --
5557 ----------------------------------
5559 function Fully_Conformant_Expressions
5560 (Given_E1
: Node_Id
;
5561 Given_E2
: Node_Id
) return Boolean
5563 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
5564 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
5565 -- We always test conformance on original nodes, since it is possible
5566 -- for analysis and/or expansion to make things look as though they
5567 -- conform when they do not, e.g. by converting 1+2 into 3.
5569 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
5570 renames Fully_Conformant_Expressions
;
5572 function FCL
(L1
, L2
: List_Id
) return Boolean;
5573 -- Compare elements of two lists for conformance. Elements have to
5574 -- be conformant, and actuals inserted as default parameters do not
5575 -- match explicit actuals with the same value.
5577 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
5578 -- Compare an operator node with a function call
5584 function FCL
(L1
, L2
: List_Id
) return Boolean is
5588 if L1
= No_List
then
5594 if L2
= No_List
then
5600 -- Compare two lists, skipping rewrite insertions (we want to
5601 -- compare the original trees, not the expanded versions!)
5604 if Is_Rewrite_Insertion
(N1
) then
5606 elsif Is_Rewrite_Insertion
(N2
) then
5612 elsif not FCE
(N1
, N2
) then
5625 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
5626 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
5631 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
5636 Act
:= First
(Actuals
);
5638 if Nkind
(Op_Node
) in N_Binary_Op
then
5640 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
5647 return Present
(Act
)
5648 and then FCE
(Right_Opnd
(Op_Node
), Act
)
5649 and then No
(Next
(Act
));
5653 -- Start of processing for Fully_Conformant_Expressions
5656 -- Non-conformant if paren count does not match. Note: if some idiot
5657 -- complains that we don't do this right for more than 3 levels of
5658 -- parentheses, they will be treated with the respect they deserve!
5660 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
5663 -- If same entities are referenced, then they are conformant even if
5664 -- they have different forms (RM 8.3.1(19-20)).
5666 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
5667 if Present
(Entity
(E1
)) then
5668 return Entity
(E1
) = Entity
(E2
)
5669 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
5670 and then Ekind
(Entity
(E1
)) = E_Discriminant
5671 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
5673 elsif Nkind
(E1
) = N_Expanded_Name
5674 and then Nkind
(E2
) = N_Expanded_Name
5675 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5676 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5678 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
5681 -- Identifiers in component associations don't always have
5682 -- entities, but their names must conform.
5684 return Nkind
(E1
) = N_Identifier
5685 and then Nkind
(E2
) = N_Identifier
5686 and then Chars
(E1
) = Chars
(E2
);
5689 elsif Nkind
(E1
) = N_Character_Literal
5690 and then Nkind
(E2
) = N_Expanded_Name
5692 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5693 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
5695 elsif Nkind
(E2
) = N_Character_Literal
5696 and then Nkind
(E1
) = N_Expanded_Name
5698 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5699 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
5701 elsif Nkind
(E1
) in N_Op
5702 and then Nkind
(E2
) = N_Function_Call
5704 return FCO
(E1
, E2
);
5706 elsif Nkind
(E2
) in N_Op
5707 and then Nkind
(E1
) = N_Function_Call
5709 return FCO
(E2
, E1
);
5711 -- Otherwise we must have the same syntactic entity
5713 elsif Nkind
(E1
) /= Nkind
(E2
) then
5716 -- At this point, we specialize by node type
5723 FCL
(Expressions
(E1
), Expressions
(E2
))
5724 and then FCL
(Component_Associations
(E1
),
5725 Component_Associations
(E2
));
5728 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
5730 Nkind
(Expression
(E2
)) = N_Qualified_Expression
5732 return FCE
(Expression
(E1
), Expression
(E2
));
5734 -- Check that the subtype marks and any constraints
5739 Indic1
: constant Node_Id
:= Expression
(E1
);
5740 Indic2
: constant Node_Id
:= Expression
(E2
);
5745 if Nkind
(Indic1
) /= N_Subtype_Indication
then
5747 Nkind
(Indic2
) /= N_Subtype_Indication
5748 and then Entity
(Indic1
) = Entity
(Indic2
);
5750 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
5752 Nkind
(Indic1
) /= N_Subtype_Indication
5753 and then Entity
(Indic1
) = Entity
(Indic2
);
5756 if Entity
(Subtype_Mark
(Indic1
)) /=
5757 Entity
(Subtype_Mark
(Indic2
))
5762 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
5763 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
5765 while Present
(Elt1
) and then Present
(Elt2
) loop
5766 if not FCE
(Elt1
, Elt2
) then
5779 when N_Attribute_Reference
=>
5781 Attribute_Name
(E1
) = Attribute_Name
(E2
)
5782 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5786 Entity
(E1
) = Entity
(E2
)
5787 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5788 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5790 when N_And_Then | N_Or_Else | N_Membership_Test
=>
5792 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
5794 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5796 when N_Character_Literal
=>
5798 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
5800 when N_Component_Association
=>
5802 FCL
(Choices
(E1
), Choices
(E2
))
5803 and then FCE
(Expression
(E1
), Expression
(E2
));
5805 when N_Conditional_Expression
=>
5807 FCL
(Expressions
(E1
), Expressions
(E2
));
5809 when N_Explicit_Dereference
=>
5811 FCE
(Prefix
(E1
), Prefix
(E2
));
5813 when N_Extension_Aggregate
=>
5815 FCL
(Expressions
(E1
), Expressions
(E2
))
5816 and then Null_Record_Present
(E1
) =
5817 Null_Record_Present
(E2
)
5818 and then FCL
(Component_Associations
(E1
),
5819 Component_Associations
(E2
));
5821 when N_Function_Call
=>
5823 FCE
(Name
(E1
), Name
(E2
))
5824 and then FCL
(Parameter_Associations
(E1
),
5825 Parameter_Associations
(E2
));
5827 when N_Indexed_Component
=>
5829 FCE
(Prefix
(E1
), Prefix
(E2
))
5830 and then FCL
(Expressions
(E1
), Expressions
(E2
));
5832 when N_Integer_Literal
=>
5833 return (Intval
(E1
) = Intval
(E2
));
5838 when N_Operator_Symbol
=>
5840 Chars
(E1
) = Chars
(E2
);
5842 when N_Others_Choice
=>
5845 when N_Parameter_Association
=>
5847 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
5848 and then FCE
(Explicit_Actual_Parameter
(E1
),
5849 Explicit_Actual_Parameter
(E2
));
5851 when N_Qualified_Expression
=>
5853 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5854 and then FCE
(Expression
(E1
), Expression
(E2
));
5858 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
5859 and then FCE
(High_Bound
(E1
), High_Bound
(E2
));
5861 when N_Real_Literal
=>
5862 return (Realval
(E1
) = Realval
(E2
));
5864 when N_Selected_Component
=>
5866 FCE
(Prefix
(E1
), Prefix
(E2
))
5867 and then FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
5871 FCE
(Prefix
(E1
), Prefix
(E2
))
5872 and then FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
5874 when N_String_Literal
=>
5876 S1
: constant String_Id
:= Strval
(E1
);
5877 S2
: constant String_Id
:= Strval
(E2
);
5878 L1
: constant Nat
:= String_Length
(S1
);
5879 L2
: constant Nat
:= String_Length
(S2
);
5886 for J
in 1 .. L1
loop
5887 if Get_String_Char
(S1
, J
) /=
5888 Get_String_Char
(S2
, J
)
5898 when N_Type_Conversion
=>
5900 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5901 and then FCE
(Expression
(E1
), Expression
(E2
));
5905 Entity
(E1
) = Entity
(E2
)
5906 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
5908 when N_Unchecked_Type_Conversion
=>
5910 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
5911 and then FCE
(Expression
(E1
), Expression
(E2
));
5913 -- All other node types cannot appear in this context. Strictly
5914 -- we should raise a fatal internal error. Instead we just ignore
5915 -- the nodes. This means that if anyone makes a mistake in the
5916 -- expander and mucks an expression tree irretrievably, the
5917 -- result will be a failure to detect a (probably very obscure)
5918 -- case of non-conformance, which is better than bombing on some
5919 -- case where two expressions do in fact conform.
5926 end Fully_Conformant_Expressions
;
5928 ----------------------------------------
5929 -- Fully_Conformant_Discrete_Subtypes --
5930 ----------------------------------------
5932 function Fully_Conformant_Discrete_Subtypes
5933 (Given_S1
: Node_Id
;
5934 Given_S2
: Node_Id
) return Boolean
5936 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
5937 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
5939 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
5940 -- Special-case for a bound given by a discriminant, which in the body
5941 -- is replaced with the discriminal of the enclosing type.
5943 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
5944 -- Check both bounds
5946 -----------------------
5947 -- Conforming_Bounds --
5948 -----------------------
5950 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
5952 if Is_Entity_Name
(B1
)
5953 and then Is_Entity_Name
(B2
)
5954 and then Ekind
(Entity
(B1
)) = E_Discriminant
5956 return Chars
(B1
) = Chars
(B2
);
5959 return Fully_Conformant_Expressions
(B1
, B2
);
5961 end Conforming_Bounds
;
5963 -----------------------
5964 -- Conforming_Ranges --
5965 -----------------------
5967 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
5970 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
5972 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
5973 end Conforming_Ranges
;
5975 -- Start of processing for Fully_Conformant_Discrete_Subtypes
5978 if Nkind
(S1
) /= Nkind
(S2
) then
5981 elsif Is_Entity_Name
(S1
) then
5982 return Entity
(S1
) = Entity
(S2
);
5984 elsif Nkind
(S1
) = N_Range
then
5985 return Conforming_Ranges
(S1
, S2
);
5987 elsif Nkind
(S1
) = N_Subtype_Indication
then
5989 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
5992 (Range_Expression
(Constraint
(S1
)),
5993 Range_Expression
(Constraint
(S2
)));
5997 end Fully_Conformant_Discrete_Subtypes
;
5999 --------------------
6000 -- Install_Entity --
6001 --------------------
6003 procedure Install_Entity
(E
: Entity_Id
) is
6004 Prev
: constant Entity_Id
:= Current_Entity
(E
);
6006 Set_Is_Immediately_Visible
(E
);
6007 Set_Current_Entity
(E
);
6008 Set_Homonym
(E
, Prev
);
6011 ---------------------
6012 -- Install_Formals --
6013 ---------------------
6015 procedure Install_Formals
(Id
: Entity_Id
) is
6018 F
:= First_Formal
(Id
);
6019 while Present
(F
) loop
6023 end Install_Formals
;
6025 -----------------------------
6026 -- Is_Interface_Conformant --
6027 -----------------------------
6029 function Is_Interface_Conformant
6030 (Tagged_Type
: Entity_Id
;
6031 Iface_Prim
: Entity_Id
;
6032 Prim
: Entity_Id
) return Boolean
6034 Iface
: constant Entity_Id
:= Find_Dispatching_Type
(Iface_Prim
);
6035 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
6038 pragma Assert
(Is_Subprogram
(Iface_Prim
)
6039 and then Is_Subprogram
(Prim
)
6040 and then Is_Dispatching_Operation
(Iface_Prim
)
6041 and then Is_Dispatching_Operation
(Prim
));
6043 pragma Assert
(Is_Interface
(Iface
)
6044 or else (Present
(Alias
(Iface_Prim
))
6047 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
6049 if Prim
= Iface_Prim
6050 or else not Is_Subprogram
(Prim
)
6051 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
6052 or else not Is_Dispatching_Operation
(Prim
)
6053 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
6055 or else Base_Type
(Typ
) /= Tagged_Type
6056 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
6060 -- Case of a procedure, or a function that does not have a controlling
6061 -- result (I or access I).
6063 elsif Ekind
(Iface_Prim
) = E_Procedure
6064 or else Etype
(Prim
) = Etype
(Iface_Prim
)
6065 or else not Has_Controlling_Result
(Prim
)
6067 return Type_Conformant
(Prim
, Iface_Prim
,
6068 Skip_Controlling_Formals
=> True);
6070 -- Case of a function returning an interface, or an access to one.
6071 -- Check that the return types correspond.
6073 elsif Implements_Interface
(Typ
, Iface
) then
6074 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
6076 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
6081 Type_Conformant
(Prim
, Iface_Prim
,
6082 Skip_Controlling_Formals
=> True);
6088 end Is_Interface_Conformant
;
6090 ---------------------------------
6091 -- Is_Non_Overriding_Operation --
6092 ---------------------------------
6094 function Is_Non_Overriding_Operation
6095 (Prev_E
: Entity_Id
;
6096 New_E
: Entity_Id
) return Boolean
6100 G_Typ
: Entity_Id
:= Empty
;
6102 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
6103 -- If F_Type is a derived type associated with a generic actual subtype,
6104 -- then return its Generic_Parent_Type attribute, else return Empty.
6106 function Types_Correspond
6107 (P_Type
: Entity_Id
;
6108 N_Type
: Entity_Id
) return Boolean;
6109 -- Returns true if and only if the types (or designated types in the
6110 -- case of anonymous access types) are the same or N_Type is derived
6111 -- directly or indirectly from P_Type.
6113 -----------------------------
6114 -- Get_Generic_Parent_Type --
6115 -----------------------------
6117 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
6122 if Is_Derived_Type
(F_Typ
)
6123 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
6125 -- The tree must be traversed to determine the parent subtype in
6126 -- the generic unit, which unfortunately isn't always available
6127 -- via semantic attributes. ??? (Note: The use of Original_Node
6128 -- is needed for cases where a full derived type has been
6131 Indic
:= Subtype_Indication
6132 (Type_Definition
(Original_Node
(Parent
(F_Typ
))));
6134 if Nkind
(Indic
) = N_Subtype_Indication
then
6135 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
6137 G_Typ
:= Entity
(Indic
);
6140 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
6141 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
6143 return Generic_Parent_Type
(Parent
(G_Typ
));
6148 end Get_Generic_Parent_Type
;
6150 ----------------------
6151 -- Types_Correspond --
6152 ----------------------
6154 function Types_Correspond
6155 (P_Type
: Entity_Id
;
6156 N_Type
: Entity_Id
) return Boolean
6158 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
6159 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
6162 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
6163 Prev_Type
:= Designated_Type
(Prev_Type
);
6166 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
6167 New_Type
:= Designated_Type
(New_Type
);
6170 if Prev_Type
= New_Type
then
6173 elsif not Is_Class_Wide_Type
(New_Type
) then
6174 while Etype
(New_Type
) /= New_Type
loop
6175 New_Type
:= Etype
(New_Type
);
6176 if New_Type
= Prev_Type
then
6182 end Types_Correspond
;
6184 -- Start of processing for Is_Non_Overriding_Operation
6187 -- In the case where both operations are implicit derived subprograms
6188 -- then neither overrides the other. This can only occur in certain
6189 -- obscure cases (e.g., derivation from homographs created in a generic
6192 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
6195 elsif Ekind
(Current_Scope
) = E_Package
6196 and then Is_Generic_Instance
(Current_Scope
)
6197 and then In_Private_Part
(Current_Scope
)
6198 and then Comes_From_Source
(New_E
)
6200 -- We examine the formals and result subtype of the inherited
6201 -- operation, to determine whether their type is derived from (the
6202 -- instance of) a generic type.
6204 Formal
:= First_Formal
(Prev_E
);
6206 while Present
(Formal
) loop
6207 F_Typ
:= Base_Type
(Etype
(Formal
));
6209 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
6210 F_Typ
:= Designated_Type
(F_Typ
);
6213 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
6215 Next_Formal
(Formal
);
6218 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
6219 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
6226 -- If the generic type is a private type, then the original
6227 -- operation was not overriding in the generic, because there was
6228 -- no primitive operation to override.
6230 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
6231 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
6232 N_Formal_Private_Type_Definition
6236 -- The generic parent type is the ancestor of a formal derived
6237 -- type declaration. We need to check whether it has a primitive
6238 -- operation that should be overridden by New_E in the generic.
6242 P_Formal
: Entity_Id
;
6243 N_Formal
: Entity_Id
;
6247 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
6250 while Present
(Prim_Elt
) loop
6251 P_Prim
:= Node
(Prim_Elt
);
6253 if Chars
(P_Prim
) = Chars
(New_E
)
6254 and then Ekind
(P_Prim
) = Ekind
(New_E
)
6256 P_Formal
:= First_Formal
(P_Prim
);
6257 N_Formal
:= First_Formal
(New_E
);
6258 while Present
(P_Formal
) and then Present
(N_Formal
) loop
6259 P_Typ
:= Etype
(P_Formal
);
6260 N_Typ
:= Etype
(N_Formal
);
6262 if not Types_Correspond
(P_Typ
, N_Typ
) then
6266 Next_Entity
(P_Formal
);
6267 Next_Entity
(N_Formal
);
6270 -- Found a matching primitive operation belonging to the
6271 -- formal ancestor type, so the new subprogram is
6275 and then No
(N_Formal
)
6276 and then (Ekind
(New_E
) /= E_Function
6279 (Etype
(P_Prim
), Etype
(New_E
)))
6285 Next_Elmt
(Prim_Elt
);
6288 -- If no match found, then the new subprogram does not
6289 -- override in the generic (nor in the instance).
6297 end Is_Non_Overriding_Operation
;
6299 ------------------------------
6300 -- Make_Inequality_Operator --
6301 ------------------------------
6303 -- S is the defining identifier of an equality operator. We build a
6304 -- subprogram declaration with the right signature. This operation is
6305 -- intrinsic, because it is always expanded as the negation of the
6306 -- call to the equality function.
6308 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
6309 Loc
: constant Source_Ptr
:= Sloc
(S
);
6312 Op_Name
: Entity_Id
;
6314 FF
: constant Entity_Id
:= First_Formal
(S
);
6315 NF
: constant Entity_Id
:= Next_Formal
(FF
);
6318 -- Check that equality was properly defined, ignore call if not
6325 A
: constant Entity_Id
:=
6326 Make_Defining_Identifier
(Sloc
(FF
),
6327 Chars
=> Chars
(FF
));
6329 B
: constant Entity_Id
:=
6330 Make_Defining_Identifier
(Sloc
(NF
),
6331 Chars
=> Chars
(NF
));
6334 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
6336 Formals
:= New_List
(
6337 Make_Parameter_Specification
(Loc
,
6338 Defining_Identifier
=> A
,
6340 New_Reference_To
(Etype
(First_Formal
(S
)),
6341 Sloc
(Etype
(First_Formal
(S
))))),
6343 Make_Parameter_Specification
(Loc
,
6344 Defining_Identifier
=> B
,
6346 New_Reference_To
(Etype
(Next_Formal
(First_Formal
(S
))),
6347 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
6350 Make_Subprogram_Declaration
(Loc
,
6352 Make_Function_Specification
(Loc
,
6353 Defining_Unit_Name
=> Op_Name
,
6354 Parameter_Specifications
=> Formals
,
6355 Result_Definition
=>
6356 New_Reference_To
(Standard_Boolean
, Loc
)));
6358 -- Insert inequality right after equality if it is explicit or after
6359 -- the derived type when implicit. These entities are created only
6360 -- for visibility purposes, and eventually replaced in the course of
6361 -- expansion, so they do not need to be attached to the tree and seen
6362 -- by the back-end. Keeping them internal also avoids spurious
6363 -- freezing problems. The declaration is inserted in the tree for
6364 -- analysis, and removed afterwards. If the equality operator comes
6365 -- from an explicit declaration, attach the inequality immediately
6366 -- after. Else the equality is inherited from a derived type
6367 -- declaration, so insert inequality after that declaration.
6369 if No
(Alias
(S
)) then
6370 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
6371 elsif Is_List_Member
(Parent
(S
)) then
6372 Insert_After
(Parent
(S
), Decl
);
6374 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
6377 Mark_Rewrite_Insertion
(Decl
);
6378 Set_Is_Intrinsic_Subprogram
(Op_Name
);
6381 Set_Has_Completion
(Op_Name
);
6382 Set_Corresponding_Equality
(Op_Name
, S
);
6383 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
6385 end Make_Inequality_Operator
;
6387 ----------------------
6388 -- May_Need_Actuals --
6389 ----------------------
6391 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
6396 F
:= First_Formal
(Fun
);
6398 while Present
(F
) loop
6399 if No
(Default_Value
(F
)) then
6407 Set_Needs_No_Actuals
(Fun
, B
);
6408 end May_Need_Actuals
;
6410 ---------------------
6411 -- Mode_Conformant --
6412 ---------------------
6414 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
6417 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
6419 end Mode_Conformant
;
6421 ---------------------------
6422 -- New_Overloaded_Entity --
6423 ---------------------------
6425 procedure New_Overloaded_Entity
6427 Derived_Type
: Entity_Id
:= Empty
)
6429 Overridden_Subp
: Entity_Id
:= Empty
;
6430 -- Set if the current scope has an operation that is type-conformant
6431 -- with S, and becomes hidden by S.
6433 Is_Primitive_Subp
: Boolean;
6434 -- Set to True if the new subprogram is primitive
6437 -- Entity that S overrides
6439 Prev_Vis
: Entity_Id
:= Empty
;
6440 -- Predecessor of E in Homonym chain
6442 procedure Check_For_Primitive_Subprogram
6443 (Is_Primitive
: out Boolean;
6444 Is_Overriding
: Boolean := False);
6445 -- If the subprogram being analyzed is a primitive operation of the type
6446 -- of a formal or result, set the Has_Primitive_Operations flag on the
6447 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6448 -- corresponding flag on the entity itself for later use.
6450 procedure Check_Synchronized_Overriding
6451 (Def_Id
: Entity_Id
;
6452 Overridden_Subp
: out Entity_Id
);
6453 -- First determine if Def_Id is an entry or a subprogram either defined
6454 -- in the scope of a task or protected type, or is a primitive of such
6455 -- a type. Check whether Def_Id overrides a subprogram of an interface
6456 -- implemented by the synchronized type, return the overridden entity
6459 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
6460 -- Check that E is declared in the private part of the current package,
6461 -- or in the package body, where it may hide a previous declaration.
6462 -- We can't use In_Private_Part by itself because this flag is also
6463 -- set when freezing entities, so we must examine the place of the
6464 -- declaration in the tree, and recognize wrapper packages as well.
6466 ------------------------------------
6467 -- Check_For_Primitive_Subprogram --
6468 ------------------------------------
6470 procedure Check_For_Primitive_Subprogram
6471 (Is_Primitive
: out Boolean;
6472 Is_Overriding
: Boolean := False)
6478 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
6479 -- Returns true if T is declared in the visible part of
6480 -- the current package scope; otherwise returns false.
6481 -- Assumes that T is declared in a package.
6483 procedure Check_Private_Overriding
(T
: Entity_Id
);
6484 -- Checks that if a primitive abstract subprogram of a visible
6485 -- abstract type is declared in a private part, then it must
6486 -- override an abstract subprogram declared in the visible part.
6487 -- Also checks that if a primitive function with a controlling
6488 -- result is declared in a private part, then it must override
6489 -- a function declared in the visible part.
6491 ------------------------------
6492 -- Check_Private_Overriding --
6493 ------------------------------
6495 procedure Check_Private_Overriding
(T
: Entity_Id
) is
6497 if Is_Package_Or_Generic_Package
(Current_Scope
)
6498 and then In_Private_Part
(Current_Scope
)
6499 and then Visible_Part_Type
(T
)
6500 and then not In_Instance
6502 if Is_Abstract_Type
(T
)
6503 and then Is_Abstract_Subprogram
(S
)
6504 and then (not Is_Overriding
6505 or else not Is_Abstract_Subprogram
(E
))
6507 Error_Msg_N
("abstract subprograms must be visible "
6508 & "(RM 3.9.3(10))!", S
);
6510 elsif Ekind
(S
) = E_Function
6511 and then Is_Tagged_Type
(T
)
6512 and then T
= Base_Type
(Etype
(S
))
6513 and then not Is_Overriding
6516 ("private function with tagged result must"
6517 & " override visible-part function", S
);
6519 ("\move subprogram to the visible part"
6520 & " (RM 3.9.3(10))", S
);
6523 end Check_Private_Overriding
;
6525 -----------------------
6526 -- Visible_Part_Type --
6527 -----------------------
6529 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
6530 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
6534 -- If the entity is a private type, then it must be
6535 -- declared in a visible part.
6537 if Ekind
(T
) in Private_Kind
then
6541 -- Otherwise, we traverse the visible part looking for its
6542 -- corresponding declaration. We cannot use the declaration
6543 -- node directly because in the private part the entity of a
6544 -- private type is the one in the full view, which does not
6545 -- indicate that it is the completion of something visible.
6547 N
:= First
(Visible_Declarations
(Specification
(P
)));
6548 while Present
(N
) loop
6549 if Nkind
(N
) = N_Full_Type_Declaration
6550 and then Present
(Defining_Identifier
(N
))
6551 and then T
= Defining_Identifier
(N
)
6555 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
6556 N_Private_Extension_Declaration
)
6557 and then Present
(Defining_Identifier
(N
))
6558 and then T
= Full_View
(Defining_Identifier
(N
))
6567 end Visible_Part_Type
;
6569 -- Start of processing for Check_For_Primitive_Subprogram
6572 Is_Primitive
:= False;
6574 if not Comes_From_Source
(S
) then
6577 -- If subprogram is at library level, it is not primitive operation
6579 elsif Current_Scope
= Standard_Standard
then
6582 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
6583 and then not In_Package_Body
(Current_Scope
))
6584 or else Is_Overriding
6586 -- For function, check return type
6588 if Ekind
(S
) = E_Function
then
6589 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
6590 F_Typ
:= Designated_Type
(Etype
(S
));
6595 B_Typ
:= Base_Type
(F_Typ
);
6597 if Scope
(B_Typ
) = Current_Scope
6598 and then not Is_Class_Wide_Type
(B_Typ
)
6599 and then not Is_Generic_Type
(B_Typ
)
6601 Is_Primitive
:= True;
6602 Set_Has_Primitive_Operations
(B_Typ
);
6603 Set_Is_Primitive
(S
);
6604 Check_Private_Overriding
(B_Typ
);
6608 -- For all subprograms, check formals
6610 Formal
:= First_Formal
(S
);
6611 while Present
(Formal
) loop
6612 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
6613 F_Typ
:= Designated_Type
(Etype
(Formal
));
6615 F_Typ
:= Etype
(Formal
);
6618 B_Typ
:= Base_Type
(F_Typ
);
6620 if Ekind
(B_Typ
) = E_Access_Subtype
then
6621 B_Typ
:= Base_Type
(B_Typ
);
6624 if Scope
(B_Typ
) = Current_Scope
6625 and then not Is_Class_Wide_Type
(B_Typ
)
6626 and then not Is_Generic_Type
(B_Typ
)
6628 Is_Primitive
:= True;
6629 Set_Is_Primitive
(S
);
6630 Set_Has_Primitive_Operations
(B_Typ
);
6631 Check_Private_Overriding
(B_Typ
);
6634 Next_Formal
(Formal
);
6637 end Check_For_Primitive_Subprogram
;
6639 -----------------------------------
6640 -- Check_Synchronized_Overriding --
6641 -----------------------------------
6643 procedure Check_Synchronized_Overriding
6644 (Def_Id
: Entity_Id
;
6645 Overridden_Subp
: out Entity_Id
)
6647 Ifaces_List
: Elist_Id
;
6651 function Matches_Prefixed_View_Profile
6652 (Prim_Params
: List_Id
;
6653 Iface_Params
: List_Id
) return Boolean;
6654 -- Determine whether a subprogram's parameter profile Prim_Params
6655 -- matches that of a potentially overridden interface subprogram
6656 -- Iface_Params. Also determine if the type of first parameter of
6657 -- Iface_Params is an implemented interface.
6659 -----------------------------------
6660 -- Matches_Prefixed_View_Profile --
6661 -----------------------------------
6663 function Matches_Prefixed_View_Profile
6664 (Prim_Params
: List_Id
;
6665 Iface_Params
: List_Id
) return Boolean
6667 Iface_Id
: Entity_Id
;
6668 Iface_Param
: Node_Id
;
6669 Iface_Typ
: Entity_Id
;
6670 Prim_Id
: Entity_Id
;
6671 Prim_Param
: Node_Id
;
6672 Prim_Typ
: Entity_Id
;
6674 function Is_Implemented
6675 (Ifaces_List
: Elist_Id
;
6676 Iface
: Entity_Id
) return Boolean;
6677 -- Determine if Iface is implemented by the current task or
6680 --------------------
6681 -- Is_Implemented --
6682 --------------------
6684 function Is_Implemented
6685 (Ifaces_List
: Elist_Id
;
6686 Iface
: Entity_Id
) return Boolean
6688 Iface_Elmt
: Elmt_Id
;
6691 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
6692 while Present
(Iface_Elmt
) loop
6693 if Node
(Iface_Elmt
) = Iface
then
6697 Next_Elmt
(Iface_Elmt
);
6703 -- Start of processing for Matches_Prefixed_View_Profile
6706 Iface_Param
:= First
(Iface_Params
);
6707 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
6709 if Is_Access_Type
(Iface_Typ
) then
6710 Iface_Typ
:= Designated_Type
(Iface_Typ
);
6713 Prim_Param
:= First
(Prim_Params
);
6715 -- The first parameter of the potentially overridden subprogram
6716 -- must be an interface implemented by Prim.
6718 if not Is_Interface
(Iface_Typ
)
6719 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
6724 -- The checks on the object parameters are done, move onto the
6725 -- rest of the parameters.
6727 if not In_Scope
then
6728 Prim_Param
:= Next
(Prim_Param
);
6731 Iface_Param
:= Next
(Iface_Param
);
6732 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
6733 Iface_Id
:= Defining_Identifier
(Iface_Param
);
6734 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
6736 Prim_Id
:= Defining_Identifier
(Prim_Param
);
6737 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
6739 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
6740 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
6741 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
6743 Iface_Typ
:= Designated_Type
(Iface_Typ
);
6744 Prim_Typ
:= Designated_Type
(Prim_Typ
);
6747 -- Case of multiple interface types inside a parameter profile
6749 -- (Obj_Param : in out Iface; ...; Param : Iface)
6751 -- If the interface type is implemented, then the matching type
6752 -- in the primitive should be the implementing record type.
6754 if Ekind
(Iface_Typ
) = E_Record_Type
6755 and then Is_Interface
(Iface_Typ
)
6756 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
6758 if Prim_Typ
/= Typ
then
6762 -- The two parameters must be both mode and subtype conformant
6764 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
6766 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
6775 -- One of the two lists contains more parameters than the other
6777 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
6782 end Matches_Prefixed_View_Profile
;
6784 -- Start of processing for Check_Synchronized_Overriding
6787 Overridden_Subp
:= Empty
;
6789 -- Def_Id must be an entry or a subprogram. We should skip predefined
6790 -- primitives internally generated by the frontend; however at this
6791 -- stage predefined primitives are still not fully decorated. As a
6792 -- minor optimization we skip here internally generated subprograms.
6794 if (Ekind
(Def_Id
) /= E_Entry
6795 and then Ekind
(Def_Id
) /= E_Function
6796 and then Ekind
(Def_Id
) /= E_Procedure
)
6797 or else not Comes_From_Source
(Def_Id
)
6802 -- Search for the concurrent declaration since it contains the list
6803 -- of all implemented interfaces. In this case, the subprogram is
6804 -- declared within the scope of a protected or a task type.
6806 if Present
(Scope
(Def_Id
))
6807 and then Is_Concurrent_Type
(Scope
(Def_Id
))
6808 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
6810 Typ
:= Scope
(Def_Id
);
6813 -- The enclosing scope is not a synchronized type and the subprogram
6816 elsif No
(First_Formal
(Def_Id
)) then
6819 -- The subprogram has formals and hence it may be a primitive of a
6823 Typ
:= Etype
(First_Formal
(Def_Id
));
6825 if Is_Access_Type
(Typ
) then
6826 Typ
:= Directly_Designated_Type
(Typ
);
6829 if Is_Concurrent_Type
(Typ
)
6830 and then not Is_Generic_Actual_Type
(Typ
)
6834 -- This case occurs when the concurrent type is declared within
6835 -- a generic unit. As a result the corresponding record has been
6836 -- built and used as the type of the first formal, we just have
6837 -- to retrieve the corresponding concurrent type.
6839 elsif Is_Concurrent_Record_Type
(Typ
)
6840 and then Present
(Corresponding_Concurrent_Type
(Typ
))
6842 Typ
:= Corresponding_Concurrent_Type
(Typ
);
6850 -- There is no overriding to check if is an inherited operation in a
6851 -- type derivation on for a generic actual.
6853 Collect_Interfaces
(Typ
, Ifaces_List
);
6855 if Is_Empty_Elmt_List
(Ifaces_List
) then
6859 -- Determine whether entry or subprogram Def_Id overrides a primitive
6860 -- operation that belongs to one of the interfaces in Ifaces_List.
6863 Candidate
: Entity_Id
:= Empty
;
6864 Hom
: Entity_Id
:= Empty
;
6865 Iface_Typ
: Entity_Id
;
6866 Subp
: Entity_Id
:= Empty
;
6869 -- Traverse the homonym chain, looking at a potentially
6870 -- overridden subprogram that belongs to an implemented
6873 Hom
:= Current_Entity_In_Scope
(Def_Id
);
6874 while Present
(Hom
) loop
6878 or else not Is_Overloadable
(Subp
)
6879 or else not Is_Primitive
(Subp
)
6880 or else not Is_Dispatching_Operation
(Subp
)
6881 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
6885 -- Entries and procedures can override abstract or null
6886 -- interface procedures
6888 elsif (Ekind
(Def_Id
) = E_Procedure
6889 or else Ekind
(Def_Id
) = E_Entry
)
6890 and then Ekind
(Subp
) = E_Procedure
6891 and then Matches_Prefixed_View_Profile
6892 (Parameter_Specifications
(Parent
(Def_Id
)),
6893 Parameter_Specifications
(Parent
(Subp
)))
6897 -- For an overridden subprogram Subp, check whether the mode
6898 -- of its first parameter is correct depending on the kind
6899 -- of synchronized type.
6902 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
6905 -- In order for an entry or a protected procedure to
6906 -- override, the first parameter of the overridden
6907 -- routine must be of mode "out", "in out" or
6908 -- access-to-variable.
6910 if (Ekind
(Candidate
) = E_Entry
6911 or else Ekind
(Candidate
) = E_Procedure
)
6912 and then Is_Protected_Type
(Typ
)
6913 and then Ekind
(Formal
) /= E_In_Out_Parameter
6914 and then Ekind
(Formal
) /= E_Out_Parameter
6915 and then Nkind
(Parameter_Type
(Parent
(Formal
)))
6916 /= N_Access_Definition
6920 -- All other cases are OK since a task entry or routine
6921 -- does not have a restriction on the mode of the first
6922 -- parameter of the overridden interface routine.
6925 Overridden_Subp
:= Candidate
;
6930 -- Functions can override abstract interface functions
6932 elsif Ekind
(Def_Id
) = E_Function
6933 and then Ekind
(Subp
) = E_Function
6934 and then Matches_Prefixed_View_Profile
6935 (Parameter_Specifications
(Parent
(Def_Id
)),
6936 Parameter_Specifications
(Parent
(Subp
)))
6937 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
6938 Etype
(Result_Definition
(Parent
(Subp
)))
6940 Overridden_Subp
:= Subp
;
6944 Hom
:= Homonym
(Hom
);
6947 -- After examining all candidates for overriding, we are
6948 -- left with the best match which is a mode incompatible
6949 -- interface routine. Do not emit an error if the Expander
6950 -- is active since this error will be detected later on
6951 -- after all concurrent types are expanded and all wrappers
6952 -- are built. This check is meant for spec-only
6955 if Present
(Candidate
)
6956 and then not Expander_Active
6959 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
6961 -- Def_Id is primitive of a protected type, declared
6962 -- inside the type, and the candidate is primitive of a
6963 -- limited or synchronized interface.
6966 and then Is_Protected_Type
(Typ
)
6968 (Is_Limited_Interface
(Iface_Typ
)
6969 or else Is_Protected_Interface
(Iface_Typ
)
6970 or else Is_Synchronized_Interface
(Iface_Typ
)
6971 or else Is_Task_Interface
(Iface_Typ
))
6973 -- Must reword this message, comma before to in -gnatj
6977 ("first formal of & must be of mode `OUT`, `IN OUT`"
6978 & " or access-to-variable", Typ
, Candidate
);
6980 ("\to be overridden by protected procedure or entry "
6981 & "(RM 9.4(11.9/2))", Typ
);
6985 Overridden_Subp
:= Candidate
;
6988 end Check_Synchronized_Overriding
;
6990 ----------------------------
6991 -- Is_Private_Declaration --
6992 ----------------------------
6994 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
6995 Priv_Decls
: List_Id
;
6996 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
6999 if Is_Package_Or_Generic_Package
(Current_Scope
)
7000 and then In_Private_Part
(Current_Scope
)
7003 Private_Declarations
(
7004 Specification
(Unit_Declaration_Node
(Current_Scope
)));
7006 return In_Package_Body
(Current_Scope
)
7008 (Is_List_Member
(Decl
)
7009 and then List_Containing
(Decl
) = Priv_Decls
)
7010 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
7011 and then not Is_Compilation_Unit
(
7012 Defining_Entity
(Parent
(Decl
)))
7013 and then List_Containing
(Parent
(Parent
(Decl
)))
7018 end Is_Private_Declaration
;
7020 -- Start of processing for New_Overloaded_Entity
7023 -- We need to look for an entity that S may override. This must be a
7024 -- homonym in the current scope, so we look for the first homonym of
7025 -- S in the current scope as the starting point for the search.
7027 E
:= Current_Entity_In_Scope
(S
);
7029 -- If there is no homonym then this is definitely not overriding
7032 Enter_Overloaded_Entity
(S
);
7033 Check_Dispatching_Operation
(S
, Empty
);
7034 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7036 -- If subprogram has an explicit declaration, check whether it
7037 -- has an overriding indicator.
7039 if Comes_From_Source
(S
) then
7040 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7041 Check_Overriding_Indicator
7042 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7045 -- If there is a homonym that is not overloadable, then we have an
7046 -- error, except for the special cases checked explicitly below.
7048 elsif not Is_Overloadable
(E
) then
7050 -- Check for spurious conflict produced by a subprogram that has the
7051 -- same name as that of the enclosing generic package. The conflict
7052 -- occurs within an instance, between the subprogram and the renaming
7053 -- declaration for the package. After the subprogram, the package
7054 -- renaming declaration becomes hidden.
7056 if Ekind
(E
) = E_Package
7057 and then Present
(Renamed_Object
(E
))
7058 and then Renamed_Object
(E
) = Current_Scope
7059 and then Nkind
(Parent
(Renamed_Object
(E
))) =
7060 N_Package_Specification
7061 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
7064 Set_Is_Immediately_Visible
(E
, False);
7065 Enter_Overloaded_Entity
(S
);
7066 Set_Homonym
(S
, Homonym
(E
));
7067 Check_Dispatching_Operation
(S
, Empty
);
7068 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
7070 -- If the subprogram is implicit it is hidden by the previous
7071 -- declaration. However if it is dispatching, it must appear in the
7072 -- dispatch table anyway, because it can be dispatched to even if it
7073 -- cannot be called directly.
7075 elsif Present
(Alias
(S
))
7076 and then not Comes_From_Source
(S
)
7078 Set_Scope
(S
, Current_Scope
);
7080 if Is_Dispatching_Operation
(Alias
(S
)) then
7081 Check_Dispatching_Operation
(S
, Empty
);
7087 Error_Msg_Sloc
:= Sloc
(E
);
7089 -- Generate message, with useful additional warning if in generic
7091 if Is_Generic_Unit
(E
) then
7092 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
7093 Error_Msg_N
("\& conflicts with declaration#", S
);
7095 Error_Msg_N
("& conflicts with declaration#", S
);
7101 -- E exists and is overloadable
7104 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
7105 -- need no check against the homonym chain. They are directly added
7106 -- to the list of primitive operations of Derived_Type.
7108 if Ada_Version
>= Ada_05
7109 and then Present
(Derived_Type
)
7110 and then Is_Dispatching_Operation
(Alias
(S
))
7111 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
7112 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
7114 goto Add_New_Entity
;
7117 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7119 -- Loop through E and its homonyms to determine if any of them is
7120 -- the candidate for overriding by S.
7122 while Present
(E
) loop
7124 -- Definitely not interesting if not in the current scope
7126 if Scope
(E
) /= Current_Scope
then
7129 -- Check if we have type conformance
7131 elsif Type_Conformant
(E
, S
) then
7133 -- If the old and new entities have the same profile and one
7134 -- is not the body of the other, then this is an error, unless
7135 -- one of them is implicitly declared.
7137 -- There are some cases when both can be implicit, for example
7138 -- when both a literal and a function that overrides it are
7139 -- inherited in a derivation, or when an inherited operation
7140 -- of a tagged full type overrides the inherited operation of
7141 -- a private extension. Ada 83 had a special rule for the
7142 -- literal case. In Ada95, the later implicit operation hides
7143 -- the former, and the literal is always the former. In the
7144 -- odd case where both are derived operations declared at the
7145 -- same point, both operations should be declared, and in that
7146 -- case we bypass the following test and proceed to the next
7147 -- part (this can only occur for certain obscure cases
7148 -- involving homographs in instances and can't occur for
7149 -- dispatching operations ???). Note that the following
7150 -- condition is less than clear. For example, it's not at all
7151 -- clear why there's a test for E_Entry here. ???
7153 if Present
(Alias
(S
))
7154 and then (No
(Alias
(E
))
7155 or else Comes_From_Source
(E
)
7156 or else Is_Dispatching_Operation
(E
))
7158 (Ekind
(E
) = E_Entry
7159 or else Ekind
(E
) /= E_Enumeration_Literal
)
7161 -- When an derived operation is overloaded it may be due to
7162 -- the fact that the full view of a private extension
7163 -- re-inherits. It has to be dealt with.
7165 if Is_Package_Or_Generic_Package
(Current_Scope
)
7166 and then In_Private_Part
(Current_Scope
)
7168 Check_Operation_From_Private_View
(S
, E
);
7171 -- In any case the implicit operation remains hidden by
7172 -- the existing declaration, which is overriding.
7174 Set_Is_Overriding_Operation
(E
);
7176 if Comes_From_Source
(E
) then
7177 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
7179 -- Indicate that E overrides the operation from which
7182 if Present
(Alias
(S
)) then
7183 Set_Overridden_Operation
(E
, Alias
(S
));
7185 Set_Overridden_Operation
(E
, S
);
7191 -- Within an instance, the renaming declarations for
7192 -- actual subprograms may become ambiguous, but they do
7193 -- not hide each other.
7195 elsif Ekind
(E
) /= E_Entry
7196 and then not Comes_From_Source
(E
)
7197 and then not Is_Generic_Instance
(E
)
7198 and then (Present
(Alias
(E
))
7199 or else Is_Intrinsic_Subprogram
(E
))
7200 and then (not In_Instance
7201 or else No
(Parent
(E
))
7202 or else Nkind
(Unit_Declaration_Node
(E
)) /=
7203 N_Subprogram_Renaming_Declaration
)
7205 -- A subprogram child unit is not allowed to override
7206 -- an inherited subprogram (10.1.1(20)).
7208 if Is_Child_Unit
(S
) then
7210 ("child unit overrides inherited subprogram in parent",
7215 if Is_Non_Overriding_Operation
(E
, S
) then
7216 Enter_Overloaded_Entity
(S
);
7217 if No
(Derived_Type
)
7218 or else Is_Tagged_Type
(Derived_Type
)
7220 Check_Dispatching_Operation
(S
, Empty
);
7226 -- E is a derived operation or an internal operator which
7227 -- is being overridden. Remove E from further visibility.
7228 -- Furthermore, if E is a dispatching operation, it must be
7229 -- replaced in the list of primitive operations of its type
7230 -- (see Override_Dispatching_Operation).
7232 Overridden_Subp
:= E
;
7238 Prev
:= First_Entity
(Current_Scope
);
7240 while Present
(Prev
)
7241 and then Next_Entity
(Prev
) /= E
7246 -- It is possible for E to be in the current scope and
7247 -- yet not in the entity chain. This can only occur in a
7248 -- generic context where E is an implicit concatenation
7249 -- in the formal part, because in a generic body the
7250 -- entity chain starts with the formals.
7253 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
7255 -- E must be removed both from the entity_list of the
7256 -- current scope, and from the visibility chain
7258 if Debug_Flag_E
then
7259 Write_Str
("Override implicit operation ");
7260 Write_Int
(Int
(E
));
7264 -- If E is a predefined concatenation, it stands for four
7265 -- different operations. As a result, a single explicit
7266 -- declaration does not hide it. In a possible ambiguous
7267 -- situation, Disambiguate chooses the user-defined op,
7268 -- so it is correct to retain the previous internal one.
7270 if Chars
(E
) /= Name_Op_Concat
7271 or else Ekind
(E
) /= E_Operator
7273 -- For nondispatching derived operations that are
7274 -- overridden by a subprogram declared in the private
7275 -- part of a package, we retain the derived
7276 -- subprogram but mark it as not immediately visible.
7277 -- If the derived operation was declared in the
7278 -- visible part then this ensures that it will still
7279 -- be visible outside the package with the proper
7280 -- signature (calls from outside must also be
7281 -- directed to this version rather than the
7282 -- overriding one, unlike the dispatching case).
7283 -- Calls from inside the package will still resolve
7284 -- to the overriding subprogram since the derived one
7285 -- is marked as not visible within the package.
7287 -- If the private operation is dispatching, we achieve
7288 -- the overriding by keeping the implicit operation
7289 -- but setting its alias to be the overriding one. In
7290 -- this fashion the proper body is executed in all
7291 -- cases, but the original signature is used outside
7294 -- If the overriding is not in the private part, we
7295 -- remove the implicit operation altogether.
7297 if Is_Private_Declaration
(S
) then
7299 if not Is_Dispatching_Operation
(E
) then
7300 Set_Is_Immediately_Visible
(E
, False);
7302 -- Work done in Override_Dispatching_Operation,
7303 -- so nothing else need to be done here.
7309 -- Find predecessor of E in Homonym chain
7311 if E
= Current_Entity
(E
) then
7314 Prev_Vis
:= Current_Entity
(E
);
7315 while Homonym
(Prev_Vis
) /= E
loop
7316 Prev_Vis
:= Homonym
(Prev_Vis
);
7320 if Prev_Vis
/= Empty
then
7322 -- Skip E in the visibility chain
7324 Set_Homonym
(Prev_Vis
, Homonym
(E
));
7327 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7330 Set_Next_Entity
(Prev
, Next_Entity
(E
));
7332 if No
(Next_Entity
(Prev
)) then
7333 Set_Last_Entity
(Current_Scope
, Prev
);
7339 Enter_Overloaded_Entity
(S
);
7340 Set_Is_Overriding_Operation
(S
);
7341 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
7343 -- Indicate that S overrides the operation from which
7346 if Comes_From_Source
(S
) then
7347 if Present
(Alias
(E
)) then
7348 Set_Overridden_Operation
(S
, Alias
(E
));
7350 Set_Overridden_Operation
(S
, E
);
7354 if Is_Dispatching_Operation
(E
) then
7356 -- An overriding dispatching subprogram inherits the
7357 -- convention of the overridden subprogram (by
7360 Set_Convention
(S
, Convention
(E
));
7361 Check_Dispatching_Operation
(S
, E
);
7364 Check_Dispatching_Operation
(S
, Empty
);
7367 Check_For_Primitive_Subprogram
7368 (Is_Primitive_Subp
, Is_Overriding
=> True);
7369 goto Check_Inequality
;
7372 -- Apparent redeclarations in instances can occur when two
7373 -- formal types get the same actual type. The subprograms in
7374 -- in the instance are legal, even if not callable from the
7375 -- outside. Calls from within are disambiguated elsewhere.
7376 -- For dispatching operations in the visible part, the usual
7377 -- rules apply, and operations with the same profile are not
7380 elsif (In_Instance_Visible_Part
7381 and then not Is_Dispatching_Operation
(E
))
7382 or else In_Instance_Not_Visible
7386 -- Here we have a real error (identical profile)
7389 Error_Msg_Sloc
:= Sloc
(E
);
7391 -- Avoid cascaded errors if the entity appears in
7392 -- subsequent calls.
7394 Set_Scope
(S
, Current_Scope
);
7396 -- Generate error, with extra useful warning for the case
7397 -- of a generic instance with no completion.
7399 if Is_Generic_Instance
(S
)
7400 and then not Has_Completion
(E
)
7403 ("instantiation cannot provide body for&", S
);
7404 Error_Msg_N
("\& conflicts with declaration#", S
);
7406 Error_Msg_N
("& conflicts with declaration#", S
);
7413 -- If one subprogram has an access parameter and the other
7414 -- a parameter of an access type, calls to either might be
7415 -- ambiguous. Verify that parameters match except for the
7416 -- access parameter.
7418 if May_Hide_Profile
then
7423 F1
:= First_Formal
(S
);
7424 F2
:= First_Formal
(E
);
7425 while Present
(F1
) and then Present
(F2
) loop
7426 if Is_Access_Type
(Etype
(F1
)) then
7427 if not Is_Access_Type
(Etype
(F2
))
7428 or else not Conforming_Types
7429 (Designated_Type
(Etype
(F1
)),
7430 Designated_Type
(Etype
(F2
)),
7433 May_Hide_Profile
:= False;
7437 not Conforming_Types
7438 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
7440 May_Hide_Profile
:= False;
7451 Error_Msg_NE
("calls to& may be ambiguous?", S
, S
);
7462 -- On exit, we know that S is a new entity
7464 Enter_Overloaded_Entity
(S
);
7465 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7466 Check_Overriding_Indicator
7467 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7469 -- If S is a derived operation for an untagged type then by
7470 -- definition it's not a dispatching operation (even if the parent
7471 -- operation was dispatching), so we don't call
7472 -- Check_Dispatching_Operation in that case.
7474 if No
(Derived_Type
)
7475 or else Is_Tagged_Type
(Derived_Type
)
7477 Check_Dispatching_Operation
(S
, Empty
);
7481 -- If this is a user-defined equality operator that is not a derived
7482 -- subprogram, create the corresponding inequality. If the operation is
7483 -- dispatching, the expansion is done elsewhere, and we do not create
7484 -- an explicit inequality operation.
7486 <<Check_Inequality
>>
7487 if Chars
(S
) = Name_Op_Eq
7488 and then Etype
(S
) = Standard_Boolean
7489 and then Present
(Parent
(S
))
7490 and then not Is_Dispatching_Operation
(S
)
7492 Make_Inequality_Operator
(S
);
7494 end New_Overloaded_Entity
;
7496 ---------------------
7497 -- Process_Formals --
7498 ---------------------
7500 procedure Process_Formals
7502 Related_Nod
: Node_Id
)
7504 Param_Spec
: Node_Id
;
7506 Formal_Type
: Entity_Id
;
7510 Num_Out_Params
: Nat
:= 0;
7511 First_Out_Param
: Entity_Id
:= Empty
;
7512 -- Used for setting Is_Only_Out_Parameter
7514 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
7515 -- Check whether the default has a class-wide type. After analysis the
7516 -- default has the type of the formal, so we must also check explicitly
7517 -- for an access attribute.
7519 ---------------------------
7520 -- Is_Class_Wide_Default --
7521 ---------------------------
7523 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
7525 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
7526 or else (Nkind
(D
) = N_Attribute_Reference
7527 and then Attribute_Name
(D
) = Name_Access
7528 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
7529 end Is_Class_Wide_Default
;
7531 -- Start of processing for Process_Formals
7534 -- In order to prevent premature use of the formals in the same formal
7535 -- part, the Ekind is left undefined until all default expressions are
7536 -- analyzed. The Ekind is established in a separate loop at the end.
7538 Param_Spec
:= First
(T
);
7539 while Present
(Param_Spec
) loop
7540 Formal
:= Defining_Identifier
(Param_Spec
);
7541 Set_Never_Set_In_Source
(Formal
, True);
7542 Enter_Name
(Formal
);
7544 -- Case of ordinary parameters
7546 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
7547 Find_Type
(Parameter_Type
(Param_Spec
));
7548 Ptype
:= Parameter_Type
(Param_Spec
);
7550 if Ptype
= Error
then
7554 Formal_Type
:= Entity
(Ptype
);
7556 if Is_Incomplete_Type
(Formal_Type
)
7558 (Is_Class_Wide_Type
(Formal_Type
)
7559 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
7561 -- Ada 2005 (AI-326): Tagged incomplete types allowed
7563 if Is_Tagged_Type
(Formal_Type
) then
7566 -- Special handling of Value_Type for CIL case
7568 elsif Is_Value_Type
(Formal_Type
) then
7571 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
7572 N_Access_Procedure_Definition
)
7574 Error_Msg_N
("invalid use of incomplete type", Param_Spec
);
7576 -- An incomplete type that is not tagged is allowed in an
7577 -- access-to-subprogram type only if it is a local declaration
7578 -- with a forthcoming completion (3.10.1 (9.2/2)).
7580 elsif Scope
(Formal_Type
) /= Scope
(Current_Scope
) then
7582 ("invalid use of limited view of type", Param_Spec
);
7585 elsif Ekind
(Formal_Type
) = E_Void
then
7586 Error_Msg_NE
("premature use of&",
7587 Parameter_Type
(Param_Spec
), Formal_Type
);
7590 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7591 -- declaration corresponding to the null-excluding type of the
7592 -- formal in the enclosing scope. Finally, replace the parameter
7593 -- type of the formal with the internal subtype.
7595 if Ada_Version
>= Ada_05
7596 and then Null_Exclusion_Present
(Param_Spec
)
7598 if not Is_Access_Type
(Formal_Type
) then
7600 ("`NOT NULL` allowed only for an access type", Param_Spec
);
7603 if Can_Never_Be_Null
(Formal_Type
)
7604 and then Comes_From_Source
(Related_Nod
)
7607 ("`NOT NULL` not allowed (& already excludes null)",
7613 Create_Null_Excluding_Itype
7615 Related_Nod
=> Related_Nod
,
7616 Scope_Id
=> Scope
(Current_Scope
));
7618 -- If the designated type of the itype is an itype we
7619 -- decorate it with the Has_Delayed_Freeze attribute to
7620 -- avoid problems with the backend.
7623 -- type T is access procedure;
7624 -- procedure Op (O : not null T);
7626 if Is_Itype
(Directly_Designated_Type
(Formal_Type
)) then
7627 Set_Has_Delayed_Freeze
(Formal_Type
);
7632 -- An access formal type
7636 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
7638 -- No need to continue if we already notified errors
7640 if not Present
(Formal_Type
) then
7644 -- Ada 2005 (AI-254)
7647 AD
: constant Node_Id
:=
7648 Access_To_Subprogram_Definition
7649 (Parameter_Type
(Param_Spec
));
7651 if Present
(AD
) and then Protected_Present
(AD
) then
7653 Replace_Anonymous_Access_To_Protected_Subprogram
7659 Set_Etype
(Formal
, Formal_Type
);
7660 Default
:= Expression
(Param_Spec
);
7662 if Present
(Default
) then
7663 if Out_Present
(Param_Spec
) then
7665 ("default initialization only allowed for IN parameters",
7669 -- Do the special preanalysis of the expression (see section on
7670 -- "Handling of Default Expressions" in the spec of package Sem).
7672 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
7674 -- An access to constant cannot be the default for
7675 -- an access parameter that is an access to variable.
7677 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7678 and then not Is_Access_Constant
(Formal_Type
)
7679 and then Is_Access_Type
(Etype
(Default
))
7680 and then Is_Access_Constant
(Etype
(Default
))
7683 ("formal that is access to variable cannot be initialized " &
7684 "with an access-to-constant expression", Default
);
7687 -- Check that the designated type of an access parameter's default
7688 -- is not a class-wide type unless the parameter's designated type
7689 -- is also class-wide.
7691 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
7692 and then not From_With_Type
(Formal_Type
)
7693 and then Is_Class_Wide_Default
(Default
)
7694 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
7697 ("access to class-wide expression not allowed here", Default
);
7701 -- Ada 2005 (AI-231): Static checks
7703 if Ada_Version
>= Ada_05
7704 and then Is_Access_Type
(Etype
(Formal
))
7705 and then Can_Never_Be_Null
(Etype
(Formal
))
7707 Null_Exclusion_Static_Checks
(Param_Spec
);
7714 -- If this is the formal part of a function specification, analyze the
7715 -- subtype mark in the context where the formals are visible but not
7716 -- yet usable, and may hide outer homographs.
7718 if Nkind
(Related_Nod
) = N_Function_Specification
then
7719 Analyze_Return_Type
(Related_Nod
);
7722 -- Now set the kind (mode) of each formal
7724 Param_Spec
:= First
(T
);
7726 while Present
(Param_Spec
) loop
7727 Formal
:= Defining_Identifier
(Param_Spec
);
7728 Set_Formal_Mode
(Formal
);
7730 if Ekind
(Formal
) = E_In_Parameter
then
7731 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
7733 if Present
(Expression
(Param_Spec
)) then
7734 Default
:= Expression
(Param_Spec
);
7736 if Is_Scalar_Type
(Etype
(Default
)) then
7738 (Parameter_Type
(Param_Spec
)) /= N_Access_Definition
7740 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
7743 Formal_Type
:= Access_Definition
7744 (Related_Nod
, Parameter_Type
(Param_Spec
));
7747 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
7751 elsif Ekind
(Formal
) = E_Out_Parameter
then
7752 Num_Out_Params
:= Num_Out_Params
+ 1;
7754 if Num_Out_Params
= 1 then
7755 First_Out_Param
:= Formal
;
7758 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
7759 Num_Out_Params
:= Num_Out_Params
+ 1;
7765 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
7766 Set_Is_Only_Out_Parameter
(First_Out_Param
);
7768 end Process_Formals
;
7774 procedure Process_PPCs
7776 Spec_Id
: Entity_Id
;
7777 Body_Id
: Entity_Id
)
7779 Loc
: constant Source_Ptr
:= Sloc
(N
);
7781 Plist
: List_Id
:= No_List
;
7785 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
;
7786 -- Prag contains an analyzed precondition or postcondition pragma.
7787 -- This function copies the pragma, changes it to the corresponding
7788 -- Check pragma and returns the Check pragma as the result. The
7789 -- argument Nam is either Name_Precondition or Name_Postcondition.
7795 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
is
7796 CP
: constant Node_Id
:= New_Copy_Tree
(Prag
);
7799 -- Set Analyzed to false, since we want to reanalyze the check
7800 -- procedure. Note that it is only at the outer level that we
7801 -- do this fiddling, for the spec cases, the already preanalyzed
7802 -- parameters are not affected.
7804 -- For a postcondition pragma within a generic, preserve the pragma
7805 -- for later expansion.
7807 Set_Analyzed
(CP
, False);
7809 if Nam
= Name_Postcondition
7810 and then not Expander_Active
7815 -- Change pragma into corresponding pragma Check
7817 Prepend_To
(Pragma_Argument_Associations
(CP
),
7818 Make_Pragma_Argument_Association
(Sloc
(Prag
),
7820 Make_Identifier
(Loc
,
7822 Set_Pragma_Identifier
(CP
,
7823 Make_Identifier
(Sloc
(Prag
),
7824 Chars
=> Name_Check
));
7829 -- Start of processing for Process_PPCs
7832 -- Nothing to do if we are not generating code
7834 if Operating_Mode
/= Generate_Code
then
7838 -- Grab preconditions from spec
7840 if Present
(Spec_Id
) then
7842 -- Loop through PPC pragmas from spec. Note that preconditions from
7843 -- the body will be analyzed and converted when we scan the body
7844 -- declarations below.
7846 Prag
:= Spec_PPC_List
(Spec_Id
);
7847 while Present
(Prag
) loop
7848 if Pragma_Name
(Prag
) = Name_Precondition
7849 and then PPC_Enabled
(Prag
)
7851 -- Add pragma Check at the start of the declarations of N.
7852 -- Note that this processing reverses the order of the list,
7853 -- which is what we want since new entries were chained to
7854 -- the head of the list.
7856 Prepend
(Grab_PPC
(Name_Precondition
), Declarations
(N
));
7859 Prag
:= Next_Pragma
(Prag
);
7863 -- Build postconditions procedure if needed and prepend the following
7864 -- declaration to the start of the declarations for the subprogram.
7866 -- procedure _postconditions [(_Result : resulttype)] is
7868 -- pragma Check (Postcondition, condition [,message]);
7869 -- pragma Check (Postcondition, condition [,message]);
7873 -- First we deal with the postconditions in the body
7875 if Is_Non_Empty_List
(Declarations
(N
)) then
7877 -- Loop through declarations
7879 Prag
:= First
(Declarations
(N
));
7880 while Present
(Prag
) loop
7881 if Nkind
(Prag
) = N_Pragma
then
7883 -- If pragma, capture if enabled postcondition, else ignore
7885 if Pragma_Name
(Prag
) = Name_Postcondition
7886 and then Check_Enabled
(Name_Postcondition
)
7888 if Plist
= No_List
then
7889 Plist
:= Empty_List
;
7894 -- If expansion is disabled, as in a generic unit,
7895 -- save pragma for later expansion.
7897 if not Expander_Active
then
7898 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
7900 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7906 -- Not a pragma, if comes from source, then end scan
7908 elsif Comes_From_Source
(Prag
) then
7911 -- Skip stuff not coming from source
7919 -- Now deal with any postconditions from the spec
7921 if Present
(Spec_Id
) then
7923 -- Loop through PPC pragmas from spec
7925 Prag
:= Spec_PPC_List
(Spec_Id
);
7926 while Present
(Prag
) loop
7927 if Pragma_Name
(Prag
) = Name_Postcondition
7928 and then PPC_Enabled
(Prag
)
7930 if Plist
= No_List
then
7931 Plist
:= Empty_List
;
7934 if not Expander_Active
then
7935 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
7937 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
7941 Prag
:= Next_Pragma
(Prag
);
7945 -- If we had any postconditions and expansion is enabled, build
7946 -- the Postconditions procedure.
7949 and then Expander_Active
7951 Subp
:= Defining_Entity
(N
);
7953 if Etype
(Subp
) /= Standard_Void_Type
then
7955 Make_Parameter_Specification
(Loc
,
7956 Defining_Identifier
=>
7957 Make_Defining_Identifier
(Loc
,
7958 Chars
=> Name_uResult
),
7959 Parameter_Type
=> New_Occurrence_Of
(Etype
(Subp
), Loc
)));
7964 Prepend_To
(Declarations
(N
),
7965 Make_Subprogram_Body
(Loc
,
7967 Make_Procedure_Specification
(Loc
,
7968 Defining_Unit_Name
=>
7969 Make_Defining_Identifier
(Loc
,
7970 Chars
=> Name_uPostconditions
),
7971 Parameter_Specifications
=> Parms
),
7973 Declarations
=> Empty_List
,
7975 Handled_Statement_Sequence
=>
7976 Make_Handled_Sequence_Of_Statements
(Loc
,
7977 Statements
=> Plist
)));
7979 if Present
(Spec_Id
) then
7980 Set_Has_Postconditions
(Spec_Id
);
7982 Set_Has_Postconditions
(Body_Id
);
7987 ----------------------------
7988 -- Reference_Body_Formals --
7989 ----------------------------
7991 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
7996 if Error_Posted
(Spec
) then
8000 -- Iterate over both lists. They may be of different lengths if the two
8001 -- specs are not conformant.
8003 Fs
:= First_Formal
(Spec
);
8004 Fb
:= First_Formal
(Bod
);
8005 while Present
(Fs
) and then Present
(Fb
) loop
8006 Generate_Reference
(Fs
, Fb
, 'b');
8009 Style
.Check_Identifier
(Fb
, Fs
);
8012 Set_Spec_Entity
(Fb
, Fs
);
8013 Set_Referenced
(Fs
, False);
8017 end Reference_Body_Formals
;
8019 -------------------------
8020 -- Set_Actual_Subtypes --
8021 -------------------------
8023 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
8024 Loc
: constant Source_Ptr
:= Sloc
(N
);
8028 First_Stmt
: Node_Id
:= Empty
;
8029 AS_Needed
: Boolean;
8032 -- If this is an empty initialization procedure, no need to create
8033 -- actual subtypes (small optimization).
8035 if Ekind
(Subp
) = E_Procedure
8036 and then Is_Null_Init_Proc
(Subp
)
8041 Formal
:= First_Formal
(Subp
);
8042 while Present
(Formal
) loop
8043 T
:= Etype
(Formal
);
8045 -- We never need an actual subtype for a constrained formal
8047 if Is_Constrained
(T
) then
8050 -- If we have unknown discriminants, then we do not need an actual
8051 -- subtype, or more accurately we cannot figure it out! Note that
8052 -- all class-wide types have unknown discriminants.
8054 elsif Has_Unknown_Discriminants
(T
) then
8057 -- At this stage we have an unconstrained type that may need an
8058 -- actual subtype. For sure the actual subtype is needed if we have
8059 -- an unconstrained array type.
8061 elsif Is_Array_Type
(T
) then
8064 -- The only other case needing an actual subtype is an unconstrained
8065 -- record type which is an IN parameter (we cannot generate actual
8066 -- subtypes for the OUT or IN OUT case, since an assignment can
8067 -- change the discriminant values. However we exclude the case of
8068 -- initialization procedures, since discriminants are handled very
8069 -- specially in this context, see the section entitled "Handling of
8070 -- Discriminants" in Einfo.
8072 -- We also exclude the case of Discrim_SO_Functions (functions used
8073 -- in front end layout mode for size/offset values), since in such
8074 -- functions only discriminants are referenced, and not only are such
8075 -- subtypes not needed, but they cannot always be generated, because
8076 -- of order of elaboration issues.
8078 elsif Is_Record_Type
(T
)
8079 and then Ekind
(Formal
) = E_In_Parameter
8080 and then Chars
(Formal
) /= Name_uInit
8081 and then not Is_Unchecked_Union
(T
)
8082 and then not Is_Discrim_SO_Function
(Subp
)
8086 -- All other cases do not need an actual subtype
8092 -- Generate actual subtypes for unconstrained arrays and
8093 -- unconstrained discriminated records.
8096 if Nkind
(N
) = N_Accept_Statement
then
8098 -- If expansion is active, The formal is replaced by a local
8099 -- variable that renames the corresponding entry of the
8100 -- parameter block, and it is this local variable that may
8101 -- require an actual subtype.
8103 if Expander_Active
then
8104 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
8106 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8109 if Present
(Handled_Statement_Sequence
(N
)) then
8111 First
(Statements
(Handled_Statement_Sequence
(N
)));
8112 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
8113 Mark_Rewrite_Insertion
(Decl
);
8115 -- If the accept statement has no body, there will be no
8116 -- reference to the actuals, so no need to compute actual
8123 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8124 Prepend
(Decl
, Declarations
(N
));
8125 Mark_Rewrite_Insertion
(Decl
);
8128 -- The declaration uses the bounds of an existing object, and
8129 -- therefore needs no constraint checks.
8131 Analyze
(Decl
, Suppress
=> All_Checks
);
8133 -- We need to freeze manually the generated type when it is
8134 -- inserted anywhere else than in a declarative part.
8136 if Present
(First_Stmt
) then
8137 Insert_List_Before_And_Analyze
(First_Stmt
,
8138 Freeze_Entity
(Defining_Identifier
(Decl
), Loc
));
8141 if Nkind
(N
) = N_Accept_Statement
8142 and then Expander_Active
8144 Set_Actual_Subtype
(Renamed_Object
(Formal
),
8145 Defining_Identifier
(Decl
));
8147 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
8151 Next_Formal
(Formal
);
8153 end Set_Actual_Subtypes
;
8155 ---------------------
8156 -- Set_Formal_Mode --
8157 ---------------------
8159 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
8160 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
8163 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
8164 -- since we ensure that corresponding actuals are always valid at the
8165 -- point of the call.
8167 if Out_Present
(Spec
) then
8168 if Ekind
(Scope
(Formal_Id
)) = E_Function
8169 or else Ekind
(Scope
(Formal_Id
)) = E_Generic_Function
8171 Error_Msg_N
("functions can only have IN parameters", Spec
);
8172 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8174 elsif In_Present
(Spec
) then
8175 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
8178 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
8179 Set_Never_Set_In_Source
(Formal_Id
, True);
8180 Set_Is_True_Constant
(Formal_Id
, False);
8181 Set_Current_Value
(Formal_Id
, Empty
);
8185 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8188 -- Set Is_Known_Non_Null for access parameters since the language
8189 -- guarantees that access parameters are always non-null. We also set
8190 -- Can_Never_Be_Null, since there is no way to change the value.
8192 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
8194 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
8195 -- null; In Ada 2005, only if then null_exclusion is explicit.
8197 if Ada_Version
< Ada_05
8198 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
8200 Set_Is_Known_Non_Null
(Formal_Id
);
8201 Set_Can_Never_Be_Null
(Formal_Id
);
8204 -- Ada 2005 (AI-231): Null-exclusion access subtype
8206 elsif Is_Access_Type
(Etype
(Formal_Id
))
8207 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
8209 Set_Is_Known_Non_Null
(Formal_Id
);
8212 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
8213 Set_Formal_Validity
(Formal_Id
);
8214 end Set_Formal_Mode
;
8216 -------------------------
8217 -- Set_Formal_Validity --
8218 -------------------------
8220 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
8222 -- If no validity checking, then we cannot assume anything about the
8223 -- validity of parameters, since we do not know there is any checking
8224 -- of the validity on the call side.
8226 if not Validity_Checks_On
then
8229 -- If validity checking for parameters is enabled, this means we are
8230 -- not supposed to make any assumptions about argument values.
8232 elsif Validity_Check_Parameters
then
8235 -- If we are checking in parameters, we will assume that the caller is
8236 -- also checking parameters, so we can assume the parameter is valid.
8238 elsif Ekind
(Formal_Id
) = E_In_Parameter
8239 and then Validity_Check_In_Params
8241 Set_Is_Known_Valid
(Formal_Id
, True);
8243 -- Similar treatment for IN OUT parameters
8245 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
8246 and then Validity_Check_In_Out_Params
8248 Set_Is_Known_Valid
(Formal_Id
, True);
8250 end Set_Formal_Validity
;
8252 ------------------------
8253 -- Subtype_Conformant --
8254 ------------------------
8256 function Subtype_Conformant
8257 (New_Id
: Entity_Id
;
8259 Skip_Controlling_Formals
: Boolean := False) return Boolean
8263 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
8264 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8266 end Subtype_Conformant
;
8268 ---------------------
8269 -- Type_Conformant --
8270 ---------------------
8272 function Type_Conformant
8273 (New_Id
: Entity_Id
;
8275 Skip_Controlling_Formals
: Boolean := False) return Boolean
8279 May_Hide_Profile
:= False;
8282 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
8283 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8285 end Type_Conformant
;
8287 -------------------------------
8288 -- Valid_Operator_Definition --
8289 -------------------------------
8291 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
8294 Id
: constant Name_Id
:= Chars
(Designator
);
8298 F
:= First_Formal
(Designator
);
8299 while Present
(F
) loop
8302 if Present
(Default_Value
(F
)) then
8304 ("default values not allowed for operator parameters",
8311 -- Verify that user-defined operators have proper number of arguments
8312 -- First case of operators which can only be unary
8315 or else Id
= Name_Op_Abs
8319 -- Case of operators which can be unary or binary
8321 elsif Id
= Name_Op_Add
8322 or Id
= Name_Op_Subtract
8324 N_OK
:= (N
in 1 .. 2);
8326 -- All other operators can only be binary
8334 ("incorrect number of arguments for operator", Designator
);
8338 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
8339 and then not Is_Intrinsic_Subprogram
(Designator
)
8342 ("explicit definition of inequality not allowed", Designator
);
8344 end Valid_Operator_Definition
;