1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Checks
; use Checks
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Errout
; use Errout
;
32 with Expander
; use Expander
;
33 with Exp_Ch6
; use Exp_Ch6
;
34 with Exp_Ch7
; use Exp_Ch7
;
35 with Exp_Ch9
; use Exp_Ch9
;
36 with Exp_Disp
; use Exp_Disp
;
37 with Exp_Tss
; use Exp_Tss
;
38 with Exp_Util
; use Exp_Util
;
39 with Fname
; use Fname
;
40 with Freeze
; use Freeze
;
41 with Itypes
; use Itypes
;
42 with Lib
.Xref
; use Lib
.Xref
;
43 with Layout
; use Layout
;
44 with Namet
; use Namet
;
46 with Nlists
; use Nlists
;
47 with Nmake
; use Nmake
;
49 with Output
; use Output
;
50 with Restrict
; use Restrict
;
51 with Rident
; use Rident
;
52 with Rtsfind
; use Rtsfind
;
54 with Sem_Aux
; use Sem_Aux
;
55 with Sem_Cat
; use Sem_Cat
;
56 with Sem_Ch3
; use Sem_Ch3
;
57 with Sem_Ch4
; use Sem_Ch4
;
58 with Sem_Ch5
; use Sem_Ch5
;
59 with Sem_Ch8
; use Sem_Ch8
;
60 with Sem_Ch10
; use Sem_Ch10
;
61 with Sem_Ch12
; use Sem_Ch12
;
62 with Sem_Disp
; use Sem_Disp
;
63 with Sem_Dist
; use Sem_Dist
;
64 with Sem_Elim
; use Sem_Elim
;
65 with Sem_Eval
; use Sem_Eval
;
66 with Sem_Mech
; use Sem_Mech
;
67 with Sem_Prag
; use Sem_Prag
;
68 with Sem_Res
; use Sem_Res
;
69 with Sem_Util
; use Sem_Util
;
70 with Sem_Type
; use Sem_Type
;
71 with Sem_Warn
; use Sem_Warn
;
72 with Sinput
; use Sinput
;
73 with Stand
; use Stand
;
74 with Sinfo
; use Sinfo
;
75 with Sinfo
.CN
; use Sinfo
.CN
;
76 with Snames
; use Snames
;
77 with Stringt
; use Stringt
;
79 with Stylesw
; use Stylesw
;
80 with Tbuild
; use Tbuild
;
81 with Uintp
; use Uintp
;
82 with Urealp
; use Urealp
;
83 with Validsw
; use Validsw
;
85 package body Sem_Ch6
is
87 May_Hide_Profile
: Boolean := False;
88 -- This flag is used to indicate that two formals in two subprograms being
89 -- checked for conformance differ only in that one is an access parameter
90 -- while the other is of a general access type with the same designated
91 -- type. In this case, if the rest of the signatures match, a call to
92 -- either subprogram may be ambiguous, which is worth a warning. The flag
93 -- is set in Compatible_Types, and the warning emitted in
94 -- New_Overloaded_Entity.
96 -----------------------
97 -- Local Subprograms --
98 -----------------------
100 procedure Analyze_Return_Statement
(N
: Node_Id
);
101 -- Common processing for simple_ and extended_return_statements
103 procedure Analyze_Function_Return
(N
: Node_Id
);
104 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
105 -- applies to a [generic] function.
107 procedure Analyze_Return_Type
(N
: Node_Id
);
108 -- Subsidiary to Process_Formals: analyze subtype mark in function
109 -- specification, in a context where the formals are visible and hide
112 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
113 -- Does all the real work of Analyze_Subprogram_Body
115 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
116 -- Analyze a generic subprogram body. N is the body to be analyzed, and
117 -- Gen_Id is the defining entity Id for the corresponding spec.
119 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
);
120 -- If a subprogram has pragma Inline and inlining is active, use generic
121 -- machinery to build an unexpanded body for the subprogram. This body is
122 -- subsequently used for inline expansions at call sites. If subprogram can
123 -- be inlined (depending on size and nature of local declarations) this
124 -- function returns true. Otherwise subprogram body is treated normally.
125 -- If proper warnings are enabled and the subprogram contains a construct
126 -- that cannot be inlined, the offending construct is flagged accordingly.
128 procedure Check_Conformance
131 Ctype
: Conformance_Type
;
133 Conforms
: out Boolean;
134 Err_Loc
: Node_Id
:= Empty
;
135 Get_Inst
: Boolean := False;
136 Skip_Controlling_Formals
: Boolean := False);
137 -- Given two entities, this procedure checks that the profiles associated
138 -- with these entities meet the conformance criterion given by the third
139 -- parameter. If they conform, Conforms is set True and control returns
140 -- to the caller. If they do not conform, Conforms is set to False, and
141 -- in addition, if Errmsg is True on the call, proper messages are output
142 -- to complain about the conformance failure. If Err_Loc is non_Empty
143 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
144 -- error messages are placed on the appropriate part of the construct
145 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
146 -- against a formal access-to-subprogram type so Get_Instance_Of must
149 procedure Check_Subprogram_Order
(N
: Node_Id
);
150 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
151 -- the alpha ordering rule for N if this ordering requirement applicable.
153 procedure Check_Returns
157 Proc
: Entity_Id
:= Empty
);
158 -- Called to check for missing return statements in a function body, or for
159 -- returns present in a procedure body which has No_Return set. HSS is the
160 -- handled statement sequence for the subprogram body. This procedure
161 -- checks all flow paths to make sure they either have return (Mode = 'F',
162 -- used for functions) or do not have a return (Mode = 'P', used for
163 -- No_Return procedures). The flag Err is set if there are any control
164 -- paths not explicitly terminated by a return in the function case, and is
165 -- True otherwise. Proc is the entity for the procedure case and is used
166 -- in posting the warning message.
168 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
169 -- This procedure makes S, a new overloaded entity, into the first visible
170 -- entity with that name.
172 procedure Install_Entity
(E
: Entity_Id
);
173 -- Make single entity visible. Used for generic formals as well
175 function Is_Non_Overriding_Operation
177 New_E
: Entity_Id
) return Boolean;
178 -- Enforce the rule given in 12.3(18): a private operation in an instance
179 -- overrides an inherited operation only if the corresponding operation
180 -- was overriding in the generic. This can happen for primitive operations
181 -- of types derived (in the generic unit) from formal private or formal
184 procedure Make_Inequality_Operator
(S
: Entity_Id
);
185 -- Create the declaration for an inequality operator that is implicitly
186 -- created by a user-defined equality operator that yields a boolean.
188 procedure May_Need_Actuals
(Fun
: Entity_Id
);
189 -- Flag functions that can be called without parameters, i.e. those that
190 -- have no parameters, or those for which defaults exist for all parameters
192 procedure Process_PPCs
195 Body_Id
: Entity_Id
);
196 -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post
197 -- conditions for the body and assembling and inserting the _postconditions
198 -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are
199 -- the entities for the body and separate spec (if there is no separate
200 -- spec, Spec_Id is Empty).
202 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
203 -- Formal_Id is an formal parameter entity. This procedure deals with
204 -- setting the proper validity status for this entity, which depends on
205 -- the kind of parameter and the validity checking mode.
207 ------------------------------
208 -- Analyze_Return_Statement --
209 ------------------------------
211 procedure Analyze_Return_Statement
(N
: Node_Id
) is
213 pragma Assert
(Nkind_In
(N
, N_Simple_Return_Statement
,
214 N_Extended_Return_Statement
));
216 Returns_Object
: constant Boolean :=
217 Nkind
(N
) = N_Extended_Return_Statement
219 (Nkind
(N
) = N_Simple_Return_Statement
220 and then Present
(Expression
(N
)));
221 -- True if we're returning something; that is, "return <expression>;"
222 -- or "return Result : T [:= ...]". False for "return;". Used for error
223 -- checking: If Returns_Object is True, N should apply to a function
224 -- body; otherwise N should apply to a procedure body, entry body,
225 -- accept statement, or extended return statement.
227 function Find_What_It_Applies_To
return Entity_Id
;
228 -- Find the entity representing the innermost enclosing body, accept
229 -- statement, or extended return statement. If the result is a callable
230 -- construct or extended return statement, then this will be the value
231 -- of the Return_Applies_To attribute. Otherwise, the program is
232 -- illegal. See RM-6.5(4/2).
234 -----------------------------
235 -- Find_What_It_Applies_To --
236 -----------------------------
238 function Find_What_It_Applies_To
return Entity_Id
is
239 Result
: Entity_Id
:= Empty
;
242 -- Loop outward through the Scope_Stack, skipping blocks and loops
244 for J
in reverse 0 .. Scope_Stack
.Last
loop
245 Result
:= Scope_Stack
.Table
(J
).Entity
;
246 exit when Ekind
(Result
) /= E_Block
and then
247 Ekind
(Result
) /= E_Loop
;
250 pragma Assert
(Present
(Result
));
252 end Find_What_It_Applies_To
;
254 -- Local declarations
256 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
257 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
258 Loc
: constant Source_Ptr
:= Sloc
(N
);
259 Stm_Entity
: constant Entity_Id
:=
261 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
263 -- Start of processing for Analyze_Return_Statement
266 Set_Return_Statement_Entity
(N
, Stm_Entity
);
268 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
269 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
271 -- Place Return entity on scope stack, to simplify enforcement of 6.5
272 -- (4/2): an inner return statement will apply to this extended return.
274 if Nkind
(N
) = N_Extended_Return_Statement
then
275 Push_Scope
(Stm_Entity
);
278 -- Check that pragma No_Return is obeyed. Don't complain about the
279 -- implicitly-generated return that is placed at the end.
281 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
282 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
285 -- Warn on any unassigned OUT parameters if in procedure
287 if Ekind
(Scope_Id
) = E_Procedure
then
288 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
291 -- Check that functions return objects, and other things do not
293 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
294 if not Returns_Object
then
295 Error_Msg_N
("missing expression in return from function", N
);
298 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
299 if Returns_Object
then
300 Error_Msg_N
("procedure cannot return value (use function)", N
);
303 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
304 if Returns_Object
then
305 if Is_Protected_Type
(Scope
(Scope_Id
)) then
306 Error_Msg_N
("entry body cannot return value", N
);
308 Error_Msg_N
("accept statement cannot return value", N
);
312 elsif Kind
= E_Return_Statement
then
314 -- We are nested within another return statement, which must be an
315 -- extended_return_statement.
317 if Returns_Object
then
319 ("extended_return_statement cannot return value; " &
320 "use `""RETURN;""`", N
);
324 Error_Msg_N
("illegal context for return statement", N
);
327 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
328 Analyze_Function_Return
(N
);
331 if Nkind
(N
) = N_Extended_Return_Statement
then
335 Kill_Current_Values
(Last_Assignment_Only
=> True);
336 Check_Unreachable_Code
(N
);
337 end Analyze_Return_Statement
;
339 ---------------------------------------------
340 -- Analyze_Abstract_Subprogram_Declaration --
341 ---------------------------------------------
343 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
344 Designator
: constant Entity_Id
:=
345 Analyze_Subprogram_Specification
(Specification
(N
));
346 Scop
: constant Entity_Id
:= Current_Scope
;
349 Generate_Definition
(Designator
);
350 Set_Is_Abstract_Subprogram
(Designator
);
351 New_Overloaded_Entity
(Designator
);
352 Check_Delayed_Subprogram
(Designator
);
354 Set_Categorization_From_Scope
(Designator
, Scop
);
356 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
358 ("abstract subprogram not allowed in protected type", N
);
360 -- Issue a warning if the abstract subprogram is neither a dispatching
361 -- operation nor an operation that overrides an inherited subprogram or
362 -- predefined operator, since this most likely indicates a mistake.
364 elsif Warn_On_Redundant_Constructs
365 and then not Is_Dispatching_Operation
(Designator
)
366 and then not Is_Overriding_Operation
(Designator
)
367 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
368 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
371 ("?abstract subprogram is not dispatching or overriding", N
);
374 Generate_Reference_To_Formals
(Designator
);
375 Check_Eliminated
(Designator
);
376 end Analyze_Abstract_Subprogram_Declaration
;
378 ----------------------------------------
379 -- Analyze_Extended_Return_Statement --
380 ----------------------------------------
382 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
384 Analyze_Return_Statement
(N
);
385 end Analyze_Extended_Return_Statement
;
387 ----------------------------
388 -- Analyze_Function_Call --
389 ----------------------------
391 procedure Analyze_Function_Call
(N
: Node_Id
) is
392 P
: constant Node_Id
:= Name
(N
);
393 L
: constant List_Id
:= Parameter_Associations
(N
);
399 -- A call of the form A.B (X) may be an Ada05 call, which is rewritten
400 -- as B (A, X). If the rewriting is successful, the call has been
401 -- analyzed and we just return.
403 if Nkind
(P
) = N_Selected_Component
404 and then Name
(N
) /= P
405 and then Is_Rewrite_Substitution
(N
)
406 and then Present
(Etype
(N
))
411 -- If error analyzing name, then set Any_Type as result type and return
413 if Etype
(P
) = Any_Type
then
414 Set_Etype
(N
, Any_Type
);
418 -- Otherwise analyze the parameters
422 while Present
(Actual
) loop
424 Check_Parameterless_Call
(Actual
);
430 end Analyze_Function_Call
;
432 -----------------------------
433 -- Analyze_Function_Return --
434 -----------------------------
436 procedure Analyze_Function_Return
(N
: Node_Id
) is
437 Loc
: constant Source_Ptr
:= Sloc
(N
);
438 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
439 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
441 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
442 -- Function result subtype
444 procedure Check_Limited_Return
(Expr
: Node_Id
);
445 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
446 -- limited types. Used only for simple return statements.
447 -- Expr is the expression returned.
449 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
450 -- Check that the return_subtype_indication properly matches the result
451 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
453 --------------------------
454 -- Check_Limited_Return --
455 --------------------------
457 procedure Check_Limited_Return
(Expr
: Node_Id
) is
459 -- Ada 2005 (AI-318-02): Return-by-reference types have been
460 -- removed and replaced by anonymous access results. This is an
461 -- incompatibility with Ada 95. Not clear whether this should be
462 -- enforced yet or perhaps controllable with special switch. ???
464 if Is_Limited_Type
(R_Type
)
465 and then Comes_From_Source
(N
)
466 and then not In_Instance_Body
467 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
471 if Ada_Version
>= Ada_05
472 and then not Debug_Flag_Dot_L
473 and then not GNAT_Mode
476 ("(Ada 2005) cannot copy object of a limited type " &
477 "(RM-2005 6.5(5.5/2))", Expr
);
478 if Is_Inherently_Limited_Type
(R_Type
) then
480 ("\return by reference not permitted in Ada 2005", Expr
);
483 -- Warn in Ada 95 mode, to give folks a heads up about this
486 -- In GNAT mode, this is just a warning, to allow it to be
487 -- evilly turned off. Otherwise it is a real error.
489 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
490 if Is_Inherently_Limited_Type
(R_Type
) then
492 ("return by reference not permitted in Ada 2005 " &
493 "(RM-2005 6.5(5.5/2))?", Expr
);
496 ("cannot copy object of a limited type in Ada 2005 " &
497 "(RM-2005 6.5(5.5/2))?", Expr
);
500 -- Ada 95 mode, compatibility warnings disabled
503 return; -- skip continuation messages below
507 ("\consider switching to return of access type", Expr
);
508 Explain_Limited_Type
(R_Type
, Expr
);
510 end Check_Limited_Return
;
512 -------------------------------------
513 -- Check_Return_Subtype_Indication --
514 -------------------------------------
516 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
517 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
518 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
519 -- Subtype given in the extended return statement;
520 -- this must match R_Type.
522 Subtype_Ind
: constant Node_Id
:=
523 Object_Definition
(Original_Node
(Obj_Decl
));
525 R_Type_Is_Anon_Access
:
527 Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
529 Ekind
(R_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
531 Ekind
(R_Type
) = E_Anonymous_Access_Type
;
532 -- True if return type of the function is an anonymous access type
533 -- Can't we make Is_Anonymous_Access_Type in einfo ???
535 R_Stm_Type_Is_Anon_Access
:
537 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Subprogram_Type
539 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
541 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Type
;
542 -- True if type of the return object is an anonymous access type
545 -- First, avoid cascade errors:
547 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
551 -- "return access T" case; check that the return statement also has
552 -- "access T", and that the subtypes statically match:
553 -- if this is an access to subprogram the signatures must match.
555 if R_Type_Is_Anon_Access
then
556 if R_Stm_Type_Is_Anon_Access
then
558 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
560 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
561 Base_Type
(Designated_Type
(R_Type
))
562 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
565 ("subtype must statically match function result subtype",
566 Subtype_Mark
(Subtype_Ind
));
570 -- For two anonymous access to subprogram types, the
571 -- types themselves must be type conformant.
573 if not Conforming_Types
574 (R_Stm_Type
, R_Type
, Fully_Conformant
)
577 ("subtype must statically match function result subtype",
583 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
586 -- Subtype indication case: check that the types are the same, and
587 -- statically match if appropriate. Also handle record types with
588 -- unknown discriminants for which we have built the underlying
591 elsif Base_Type
(R_Stm_Type
) = Base_Type
(R_Type
)
592 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
593 and then Underlying_Record_View
(Base_Type
(R_Stm_Type
))
594 = Base_Type
(R_Type
))
596 -- A null exclusion may be present on the return type, on the
597 -- function specification, on the object declaration or on the
600 if Is_Access_Type
(R_Type
)
602 (Can_Never_Be_Null
(R_Type
)
603 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
604 Can_Never_Be_Null
(R_Stm_Type
)
607 ("subtype must statically match function result subtype",
611 if Is_Constrained
(R_Type
) then
612 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
614 ("subtype must statically match function result subtype",
619 -- If the function's result type doesn't match the return object
620 -- entity's type, then we check for the case where the result type
621 -- is class-wide, and allow the declaration if the type of the object
622 -- definition matches the class-wide type. This prevents rejection
623 -- in the case where the object declaration is initialized by a call
624 -- to a build-in-place function with a specific result type and the
625 -- object entity had its type changed to that specific type. This is
626 -- also allowed in the case where Obj_Decl does not come from source,
627 -- which can occur for an expansion of a simple return statement of
628 -- a build-in-place class-wide function when the result expression
629 -- has a specific type, because a return object with a specific type
630 -- is created. (Note that the ARG believes that return objects should
631 -- be allowed to have a type covered by a class-wide result type in
632 -- any case, so once that relaxation is made (see AI05-32), the above
633 -- check for type compatibility should be changed to test Covers
634 -- rather than equality, and the following special test will no
635 -- longer be needed. ???)
637 elsif Is_Class_Wide_Type
(R_Type
)
639 (R_Type
= Etype
(Object_Definition
(Original_Node
(Obj_Decl
)))
640 or else not Comes_From_Source
(Obj_Decl
))
646 ("wrong type for return_subtype_indication", Subtype_Ind
);
648 end Check_Return_Subtype_Indication
;
650 ---------------------
651 -- Local Variables --
652 ---------------------
656 -- Start of processing for Analyze_Function_Return
659 Set_Return_Present
(Scope_Id
);
661 if Nkind
(N
) = N_Simple_Return_Statement
then
662 Expr
:= Expression
(N
);
663 Analyze_And_Resolve
(Expr
, R_Type
);
664 Check_Limited_Return
(Expr
);
667 -- Analyze parts specific to extended_return_statement:
670 Obj_Decl
: constant Node_Id
:=
671 Last
(Return_Object_Declarations
(N
));
673 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
676 Expr
:= Expression
(Obj_Decl
);
678 -- Note: The check for OK_For_Limited_Init will happen in
679 -- Analyze_Object_Declaration; we treat it as a normal
680 -- object declaration.
682 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
685 Check_Return_Subtype_Indication
(Obj_Decl
);
687 if Present
(HSS
) then
690 if Present
(Exception_Handlers
(HSS
)) then
692 -- ???Has_Nested_Block_With_Handler needs to be set.
693 -- Probably by creating an actual N_Block_Statement.
694 -- Probably in Expand.
700 Check_References
(Stm_Entity
);
704 -- Case of Expr present
708 -- Defend against previous errors
710 and then Nkind
(Expr
) /= N_Empty
711 and then Present
(Etype
(Expr
))
713 -- Apply constraint check. Note that this is done before the implicit
714 -- conversion of the expression done for anonymous access types to
715 -- ensure correct generation of the null-excluding check associated
716 -- with null-excluding expressions found in return statements.
718 Apply_Constraint_Check
(Expr
, R_Type
);
720 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
721 -- type, apply an implicit conversion of the expression to that type
722 -- to force appropriate static and run-time accessibility checks.
724 if Ada_Version
>= Ada_05
725 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
727 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
728 Analyze_And_Resolve
(Expr
, R_Type
);
731 -- If the result type is class-wide, then check that the return
732 -- expression's type is not declared at a deeper level than the
733 -- function (RM05-6.5(5.6/2)).
735 if Ada_Version
>= Ada_05
736 and then Is_Class_Wide_Type
(R_Type
)
738 if Type_Access_Level
(Etype
(Expr
)) >
739 Subprogram_Access_Level
(Scope_Id
)
742 ("level of return expression type is deeper than " &
743 "class-wide function!", Expr
);
747 if (Is_Class_Wide_Type
(Etype
(Expr
))
748 or else Is_Dynamically_Tagged
(Expr
))
749 and then not Is_Class_Wide_Type
(R_Type
)
752 ("dynamically tagged expression not allowed!", Expr
);
755 -- ??? A real run-time accessibility check is needed in cases
756 -- involving dereferences of access parameters. For now we just
757 -- check the static cases.
759 if (Ada_Version
< Ada_05
or else Debug_Flag_Dot_L
)
760 and then Is_Inherently_Limited_Type
(Etype
(Scope_Id
))
761 and then Object_Access_Level
(Expr
) >
762 Subprogram_Access_Level
(Scope_Id
)
765 Make_Raise_Program_Error
(Loc
,
766 Reason
=> PE_Accessibility_Check_Failed
));
770 ("cannot return a local value by reference?", N
);
772 ("\& will be raised at run time?",
773 N
, Standard_Program_Error
);
777 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
778 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
780 Apply_Compile_Time_Constraint_Error
782 Msg
=> "(Ada 2005) null not allowed for "
783 & "null-excluding return?",
784 Reason
=> CE_Null_Not_Allowed
);
787 end Analyze_Function_Return
;
789 -------------------------------------
790 -- Analyze_Generic_Subprogram_Body --
791 -------------------------------------
793 procedure Analyze_Generic_Subprogram_Body
797 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
798 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
804 -- Copy body and disable expansion while analyzing the generic For a
805 -- stub, do not copy the stub (which would load the proper body), this
806 -- will be done when the proper body is analyzed.
808 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
809 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
814 Spec
:= Specification
(N
);
816 -- Within the body of the generic, the subprogram is callable, and
817 -- behaves like the corresponding non-generic unit.
819 Body_Id
:= Defining_Entity
(Spec
);
821 if Kind
= E_Generic_Procedure
822 and then Nkind
(Spec
) /= N_Procedure_Specification
824 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
827 elsif Kind
= E_Generic_Function
828 and then Nkind
(Spec
) /= N_Function_Specification
830 Error_Msg_N
("invalid body for generic function ", Body_Id
);
834 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
836 if Has_Completion
(Gen_Id
)
837 and then Nkind
(Parent
(N
)) /= N_Subunit
839 Error_Msg_N
("duplicate generic body", N
);
842 Set_Has_Completion
(Gen_Id
);
845 if Nkind
(N
) = N_Subprogram_Body_Stub
then
846 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
848 Set_Corresponding_Spec
(N
, Gen_Id
);
851 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
852 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
855 -- Make generic parameters immediately visible in the body. They are
856 -- needed to process the formals declarations. Then make the formals
857 -- visible in a separate step.
863 First_Ent
: Entity_Id
;
866 First_Ent
:= First_Entity
(Gen_Id
);
869 while Present
(E
) and then not Is_Formal
(E
) loop
874 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
876 -- Now generic formals are visible, and the specification can be
877 -- analyzed, for subsequent conformance check.
879 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
881 -- Make formal parameters visible
885 -- E is the first formal parameter, we loop through the formals
886 -- installing them so that they will be visible.
888 Set_First_Entity
(Gen_Id
, E
);
889 while Present
(E
) loop
895 -- Visible generic entity is callable within its own body
897 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
898 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
899 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
900 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
901 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
902 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
904 if Nkind
(N
) = N_Subprogram_Body_Stub
then
906 -- No body to analyze, so restore state of generic unit
908 Set_Ekind
(Gen_Id
, Kind
);
909 Set_Ekind
(Body_Id
, Kind
);
911 if Present
(First_Ent
) then
912 Set_First_Entity
(Gen_Id
, First_Ent
);
919 -- If this is a compilation unit, it must be made visible explicitly,
920 -- because the compilation of the declaration, unlike other library
921 -- unit declarations, does not. If it is not a unit, the following
922 -- is redundant but harmless.
924 Set_Is_Immediately_Visible
(Gen_Id
);
925 Reference_Body_Formals
(Gen_Id
, Body_Id
);
927 if Is_Child_Unit
(Gen_Id
) then
928 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
931 Set_Actual_Subtypes
(N
, Current_Scope
);
932 Process_PPCs
(N
, Gen_Id
, Body_Id
);
934 -- If the generic unit carries pre- or post-conditions, copy them
935 -- to the original generic tree, so that they are properly added
936 -- to any instantiation.
939 Orig
: constant Node_Id
:= Original_Node
(N
);
943 Cond
:= First
(Declarations
(N
));
944 while Present
(Cond
) loop
945 if Nkind
(Cond
) = N_Pragma
946 and then Pragma_Name
(Cond
) = Name_Check
948 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
950 elsif Nkind
(Cond
) = N_Pragma
951 and then Pragma_Name
(Cond
) = Name_Postcondition
953 Set_Ekind
(Defining_Entity
(Orig
), Ekind
(Gen_Id
));
954 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
963 Analyze_Declarations
(Declarations
(N
));
965 Analyze
(Handled_Statement_Sequence
(N
));
967 Save_Global_References
(Original_Node
(N
));
969 -- Prior to exiting the scope, include generic formals again (if any
970 -- are present) in the set of local entities.
972 if Present
(First_Ent
) then
973 Set_First_Entity
(Gen_Id
, First_Ent
);
976 Check_References
(Gen_Id
);
979 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
981 Check_Subprogram_Order
(N
);
983 -- Outside of its body, unit is generic again
985 Set_Ekind
(Gen_Id
, Kind
);
986 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
989 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
992 end Analyze_Generic_Subprogram_Body
;
994 -----------------------------
995 -- Analyze_Operator_Symbol --
996 -----------------------------
998 -- An operator symbol such as "+" or "and" may appear in context where the
999 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1000 -- is just a string, as in (conjunction = "or"). In these cases the parser
1001 -- generates this node, and the semantics does the disambiguation. Other
1002 -- such case are actuals in an instantiation, the generic unit in an
1003 -- instantiation, and pragma arguments.
1005 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1006 Par
: constant Node_Id
:= Parent
(N
);
1009 if (Nkind
(Par
) = N_Function_Call
1010 and then N
= Name
(Par
))
1011 or else Nkind
(Par
) = N_Function_Instantiation
1012 or else (Nkind
(Par
) = N_Indexed_Component
1013 and then N
= Prefix
(Par
))
1014 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1015 and then not Is_Pragma_String_Literal
(Par
))
1016 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1017 or else (Nkind
(Par
) = N_Attribute_Reference
1018 and then Attribute_Name
(Par
) /= Name_Value
)
1020 Find_Direct_Name
(N
);
1023 Change_Operator_Symbol_To_String_Literal
(N
);
1026 end Analyze_Operator_Symbol
;
1028 -----------------------------------
1029 -- Analyze_Parameter_Association --
1030 -----------------------------------
1032 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1034 Analyze
(Explicit_Actual_Parameter
(N
));
1035 end Analyze_Parameter_Association
;
1037 ----------------------------
1038 -- Analyze_Procedure_Call --
1039 ----------------------------
1041 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1042 Loc
: constant Source_Ptr
:= Sloc
(N
);
1043 P
: constant Node_Id
:= Name
(N
);
1044 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1048 procedure Analyze_Call_And_Resolve
;
1049 -- Do Analyze and Resolve calls for procedure call
1051 ------------------------------
1052 -- Analyze_Call_And_Resolve --
1053 ------------------------------
1055 procedure Analyze_Call_And_Resolve
is
1057 if Nkind
(N
) = N_Procedure_Call_Statement
then
1059 Resolve
(N
, Standard_Void_Type
);
1063 end Analyze_Call_And_Resolve
;
1065 -- Start of processing for Analyze_Procedure_Call
1068 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1069 -- a procedure call or an entry call. The prefix may denote an access
1070 -- to subprogram type, in which case an implicit dereference applies.
1071 -- If the prefix is an indexed component (without implicit dereference)
1072 -- then the construct denotes a call to a member of an entire family.
1073 -- If the prefix is a simple name, it may still denote a call to a
1074 -- parameterless member of an entry family. Resolution of these various
1075 -- interpretations is delicate.
1079 -- If this is a call of the form Obj.Op, the call may have been
1080 -- analyzed and possibly rewritten into a block, in which case
1083 if Analyzed
(N
) then
1087 -- If error analyzing prefix, then set Any_Type as result and return
1089 if Etype
(P
) = Any_Type
then
1090 Set_Etype
(N
, Any_Type
);
1094 -- Otherwise analyze the parameters
1096 if Present
(Actuals
) then
1097 Actual
:= First
(Actuals
);
1099 while Present
(Actual
) loop
1101 Check_Parameterless_Call
(Actual
);
1106 -- Special processing for Elab_Spec and Elab_Body calls
1108 if Nkind
(P
) = N_Attribute_Reference
1109 and then (Attribute_Name
(P
) = Name_Elab_Spec
1110 or else Attribute_Name
(P
) = Name_Elab_Body
)
1112 if Present
(Actuals
) then
1114 ("no parameters allowed for this call", First
(Actuals
));
1118 Set_Etype
(N
, Standard_Void_Type
);
1121 elsif Is_Entity_Name
(P
)
1122 and then Is_Record_Type
(Etype
(Entity
(P
)))
1123 and then Remote_AST_I_Dereference
(P
)
1127 elsif Is_Entity_Name
(P
)
1128 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1130 if Is_Access_Type
(Etype
(P
))
1131 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1132 and then No
(Actuals
)
1133 and then Comes_From_Source
(N
)
1135 Error_Msg_N
("missing explicit dereference in call", N
);
1138 Analyze_Call_And_Resolve
;
1140 -- If the prefix is the simple name of an entry family, this is
1141 -- a parameterless call from within the task body itself.
1143 elsif Is_Entity_Name
(P
)
1144 and then Nkind
(P
) = N_Identifier
1145 and then Ekind
(Entity
(P
)) = E_Entry_Family
1146 and then Present
(Actuals
)
1147 and then No
(Next
(First
(Actuals
)))
1149 -- Can be call to parameterless entry family. What appears to be the
1150 -- sole argument is in fact the entry index. Rewrite prefix of node
1151 -- accordingly. Source representation is unchanged by this
1155 Make_Indexed_Component
(Loc
,
1157 Make_Selected_Component
(Loc
,
1158 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1159 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1160 Expressions
=> Actuals
);
1161 Set_Name
(N
, New_N
);
1162 Set_Etype
(New_N
, Standard_Void_Type
);
1163 Set_Parameter_Associations
(N
, No_List
);
1164 Analyze_Call_And_Resolve
;
1166 elsif Nkind
(P
) = N_Explicit_Dereference
then
1167 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1168 Analyze_Call_And_Resolve
;
1170 Error_Msg_N
("expect access to procedure in call", P
);
1173 -- The name can be a selected component or an indexed component that
1174 -- yields an access to subprogram. Such a prefix is legal if the call
1175 -- has parameter associations.
1177 elsif Is_Access_Type
(Etype
(P
))
1178 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1180 if Present
(Actuals
) then
1181 Analyze_Call_And_Resolve
;
1183 Error_Msg_N
("missing explicit dereference in call ", N
);
1186 -- If not an access to subprogram, then the prefix must resolve to the
1187 -- name of an entry, entry family, or protected operation.
1189 -- For the case of a simple entry call, P is a selected component where
1190 -- the prefix is the task and the selector name is the entry. A call to
1191 -- a protected procedure will have the same syntax. If the protected
1192 -- object contains overloaded operations, the entity may appear as a
1193 -- function, the context will select the operation whose type is Void.
1195 elsif Nkind
(P
) = N_Selected_Component
1196 and then (Ekind
(Entity
(Selector_Name
(P
))) = E_Entry
1198 Ekind
(Entity
(Selector_Name
(P
))) = E_Procedure
1200 Ekind
(Entity
(Selector_Name
(P
))) = E_Function
)
1202 Analyze_Call_And_Resolve
;
1204 elsif Nkind
(P
) = N_Selected_Component
1205 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1206 and then Present
(Actuals
)
1207 and then No
(Next
(First
(Actuals
)))
1209 -- Can be call to parameterless entry family. What appears to be the
1210 -- sole argument is in fact the entry index. Rewrite prefix of node
1211 -- accordingly. Source representation is unchanged by this
1215 Make_Indexed_Component
(Loc
,
1216 Prefix
=> New_Copy
(P
),
1217 Expressions
=> Actuals
);
1218 Set_Name
(N
, New_N
);
1219 Set_Etype
(New_N
, Standard_Void_Type
);
1220 Set_Parameter_Associations
(N
, No_List
);
1221 Analyze_Call_And_Resolve
;
1223 -- For the case of a reference to an element of an entry family, P is
1224 -- an indexed component whose prefix is a selected component (task and
1225 -- entry family), and whose index is the entry family index.
1227 elsif Nkind
(P
) = N_Indexed_Component
1228 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1229 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1231 Analyze_Call_And_Resolve
;
1233 -- If the prefix is the name of an entry family, it is a call from
1234 -- within the task body itself.
1236 elsif Nkind
(P
) = N_Indexed_Component
1237 and then Nkind
(Prefix
(P
)) = N_Identifier
1238 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1241 Make_Selected_Component
(Loc
,
1242 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1243 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1244 Rewrite
(Prefix
(P
), New_N
);
1246 Analyze_Call_And_Resolve
;
1248 -- Anything else is an error
1251 Error_Msg_N
("invalid procedure or entry call", N
);
1253 end Analyze_Procedure_Call
;
1255 -------------------------------------
1256 -- Analyze_Simple_Return_Statement --
1257 -------------------------------------
1259 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1261 if Present
(Expression
(N
)) then
1262 Mark_Coextensions
(N
, Expression
(N
));
1265 Analyze_Return_Statement
(N
);
1266 end Analyze_Simple_Return_Statement
;
1268 -------------------------
1269 -- Analyze_Return_Type --
1270 -------------------------
1272 procedure Analyze_Return_Type
(N
: Node_Id
) is
1273 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1274 Typ
: Entity_Id
:= Empty
;
1277 -- Normal case where result definition does not indicate an error
1279 if Result_Definition
(N
) /= Error
then
1280 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1282 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1285 AD
: constant Node_Id
:=
1286 Access_To_Subprogram_Definition
(Result_Definition
(N
));
1288 if Present
(AD
) and then Protected_Present
(AD
) then
1289 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
1291 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1295 Set_Parent
(Typ
, Result_Definition
(N
));
1296 Set_Is_Local_Anonymous_Access
(Typ
);
1297 Set_Etype
(Designator
, Typ
);
1299 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1301 Null_Exclusion_Static_Checks
(N
);
1303 -- Subtype_Mark case
1306 Find_Type
(Result_Definition
(N
));
1307 Typ
:= Entity
(Result_Definition
(N
));
1308 Set_Etype
(Designator
, Typ
);
1310 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1312 Null_Exclusion_Static_Checks
(N
);
1314 -- If a null exclusion is imposed on the result type, then create
1315 -- a null-excluding itype (an access subtype) and use it as the
1316 -- function's Etype. Note that the null exclusion checks are done
1317 -- right before this, because they don't get applied to types that
1318 -- do not come from source.
1320 if Is_Access_Type
(Typ
)
1321 and then Null_Exclusion_Present
(N
)
1323 Set_Etype
(Designator
,
1324 Create_Null_Excluding_Itype
1327 Scope_Id
=> Scope
(Current_Scope
)));
1329 Set_Etype
(Designator
, Typ
);
1332 if Ekind
(Typ
) = E_Incomplete_Type
1333 and then Is_Value_Type
(Typ
)
1337 elsif Ekind
(Typ
) = E_Incomplete_Type
1338 or else (Is_Class_Wide_Type
(Typ
)
1340 Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
1343 ("invalid use of incomplete type&", Designator
, Typ
);
1347 -- Case where result definition does indicate an error
1350 Set_Etype
(Designator
, Any_Type
);
1352 end Analyze_Return_Type
;
1354 -----------------------------
1355 -- Analyze_Subprogram_Body --
1356 -----------------------------
1358 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
1359 Loc
: constant Source_Ptr
:= Sloc
(N
);
1360 Body_Spec
: constant Node_Id
:= Specification
(N
);
1361 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
1364 if Debug_Flag_C
then
1365 Write_Str
("==> subprogram body ");
1366 Write_Name
(Chars
(Body_Id
));
1367 Write_Str
(" from ");
1368 Write_Location
(Loc
);
1373 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
1375 -- The real work is split out into the helper, so it can do "return;"
1376 -- without skipping the debug output:
1378 Analyze_Subprogram_Body_Helper
(N
);
1380 if Debug_Flag_C
then
1382 Write_Str
("<== subprogram body ");
1383 Write_Name
(Chars
(Body_Id
));
1384 Write_Str
(" from ");
1385 Write_Location
(Loc
);
1388 end Analyze_Subprogram_Body
;
1390 ------------------------------------
1391 -- Analyze_Subprogram_Body_Helper --
1392 ------------------------------------
1394 -- This procedure is called for regular subprogram bodies, generic bodies,
1395 -- and for subprogram stubs of both kinds. In the case of stubs, only the
1396 -- specification matters, and is used to create a proper declaration for
1397 -- the subprogram, or to perform conformance checks.
1399 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
1400 Loc
: constant Source_Ptr
:= Sloc
(N
);
1401 Body_Deleted
: constant Boolean := False;
1402 Body_Spec
: constant Node_Id
:= Specification
(N
);
1403 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
1404 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
1405 Conformant
: Boolean;
1407 Missing_Ret
: Boolean;
1409 Prot_Typ
: Entity_Id
:= Empty
;
1410 Spec_Id
: Entity_Id
;
1411 Spec_Decl
: Node_Id
:= Empty
;
1413 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
1414 -- When we analyze a separate spec, the entity chain ends up containing
1415 -- the formals, as well as any itypes generated during analysis of the
1416 -- default expressions for parameters, or the arguments of associated
1417 -- precondition/postcondition pragmas (which are analyzed in the context
1418 -- of the spec since they have visibility on formals).
1420 -- These entities belong with the spec and not the body. However we do
1421 -- the analysis of the body in the context of the spec (again to obtain
1422 -- visibility to the formals), and all the entities generated during
1423 -- this analysis end up also chained to the entity chain of the spec.
1424 -- But they really belong to the body, and there is circuitry to move
1425 -- them from the spec to the body.
1427 -- However, when we do this move, we don't want to move the real spec
1428 -- entities (first para above) to the body. The Last_Real_Spec_Entity
1429 -- variable points to the last real spec entity, so we only move those
1430 -- chained beyond that point. It is initialized to Empty to deal with
1431 -- the case where there is no separate spec.
1433 procedure Check_Anonymous_Return
;
1434 -- Ada 2005: if a function returns an access type that denotes a task,
1435 -- or a type that contains tasks, we must create a master entity for
1436 -- the anonymous type, which typically will be used in an allocator
1437 -- in the body of the function.
1439 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
1440 -- Look ahead to recognize a pragma that may appear after the body.
1441 -- If there is a previous spec, check that it appears in the same
1442 -- declarative part. If the pragma is Inline_Always, perform inlining
1443 -- unconditionally, otherwise only if Front_End_Inlining is requested.
1444 -- If the body acts as a spec, and inlining is required, we create a
1445 -- subprogram declaration for it, in order to attach the body to inline.
1446 -- If pragma does not appear after the body, check whether there is
1447 -- an inline pragma before any local declarations.
1449 function Disambiguate_Spec
return Entity_Id
;
1450 -- When a primitive is declared between the private view and the full
1451 -- view of a concurrent type which implements an interface, a special
1452 -- mechanism is used to find the corresponding spec of the primitive
1455 function Is_Private_Concurrent_Primitive
1456 (Subp_Id
: Entity_Id
) return Boolean;
1457 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
1458 -- type that implements an interface and has a private view.
1460 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
1461 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
1462 -- subprogram whose body is being analyzed. N is the statement node
1463 -- causing the flag to be set, if the following statement is a return
1464 -- of an entity, we mark the entity as set in source to suppress any
1465 -- warning on the stylized use of function stubs with a dummy return.
1467 procedure Verify_Overriding_Indicator
;
1468 -- If there was a previous spec, the entity has been entered in the
1469 -- current scope previously. If the body itself carries an overriding
1470 -- indicator, check that it is consistent with the known status of the
1473 ----------------------------
1474 -- Check_Anonymous_Return --
1475 ----------------------------
1477 procedure Check_Anonymous_Return
is
1483 if Present
(Spec_Id
) then
1489 if Ekind
(Scop
) = E_Function
1490 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
1491 and then not Is_Thunk
(Scop
)
1492 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
1494 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
1496 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
1497 and then Expander_Active
1499 -- Avoid cases with no tasking support
1501 and then RTE_Available
(RE_Current_Master
)
1502 and then not Restriction_Active
(No_Task_Hierarchy
)
1505 Make_Object_Declaration
(Loc
,
1506 Defining_Identifier
=>
1507 Make_Defining_Identifier
(Loc
, Name_uMaster
),
1508 Constant_Present
=> True,
1509 Object_Definition
=>
1510 New_Reference_To
(RTE
(RE_Master_Id
), Loc
),
1512 Make_Explicit_Dereference
(Loc
,
1513 New_Reference_To
(RTE
(RE_Current_Master
), Loc
)));
1515 if Present
(Declarations
(N
)) then
1516 Prepend
(Decl
, Declarations
(N
));
1518 Set_Declarations
(N
, New_List
(Decl
));
1521 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
1522 Set_Has_Master_Entity
(Scop
);
1524 -- Now mark the containing scope as a task master
1527 while Nkind
(Par
) /= N_Compilation_Unit
loop
1528 Par
:= Parent
(Par
);
1529 pragma Assert
(Present
(Par
));
1531 -- If we fall off the top, we are at the outer level, and
1532 -- the environment task is our effective master, so nothing
1536 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
1538 Set_Is_Task_Master
(Par
, True);
1543 end Check_Anonymous_Return
;
1545 -------------------------
1546 -- Check_Inline_Pragma --
1547 -------------------------
1549 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
1553 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
1554 -- True when N is a pragma Inline or Inline_Always that applies
1555 -- to this subprogram.
1557 -----------------------
1558 -- Is_Inline_Pragma --
1559 -----------------------
1561 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
1564 Nkind
(N
) = N_Pragma
1566 (Pragma_Name
(N
) = Name_Inline_Always
1569 and then Pragma_Name
(N
) = Name_Inline
))
1572 (Expression
(First
(Pragma_Argument_Associations
(N
))))
1574 end Is_Inline_Pragma
;
1576 -- Start of processing for Check_Inline_Pragma
1579 if not Expander_Active
then
1583 if Is_List_Member
(N
)
1584 and then Present
(Next
(N
))
1585 and then Is_Inline_Pragma
(Next
(N
))
1589 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
1590 and then Present
(Declarations
(N
))
1591 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
1593 Prag
:= First
(Declarations
(N
));
1599 if Present
(Prag
) then
1600 if Present
(Spec_Id
) then
1601 if List_Containing
(N
) =
1602 List_Containing
(Unit_Declaration_Node
(Spec_Id
))
1608 -- Create a subprogram declaration, to make treatment uniform
1611 Subp
: constant Entity_Id
:=
1612 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
1613 Decl
: constant Node_Id
:=
1614 Make_Subprogram_Declaration
(Loc
,
1615 Specification
=> New_Copy_Tree
(Specification
(N
)));
1617 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
1619 if Present
(First_Formal
(Body_Id
)) then
1620 Plist
:= Copy_Parameter_List
(Body_Id
);
1621 Set_Parameter_Specifications
1622 (Specification
(Decl
), Plist
);
1625 Insert_Before
(N
, Decl
);
1628 Set_Has_Pragma_Inline
(Subp
);
1630 if Pragma_Name
(Prag
) = Name_Inline_Always
then
1631 Set_Is_Inlined
(Subp
);
1632 Set_Has_Pragma_Inline_Always
(Subp
);
1639 end Check_Inline_Pragma
;
1641 -----------------------
1642 -- Disambiguate_Spec --
1643 -----------------------
1645 function Disambiguate_Spec
return Entity_Id
is
1646 Priv_Spec
: Entity_Id
;
1649 procedure Replace_Types
(To_Corresponding
: Boolean);
1650 -- Depending on the flag, replace the type of formal parameters of
1651 -- Body_Id if it is a concurrent type implementing interfaces with
1652 -- the corresponding record type or the other way around.
1654 procedure Replace_Types
(To_Corresponding
: Boolean) is
1656 Formal_Typ
: Entity_Id
;
1659 Formal
:= First_Formal
(Body_Id
);
1660 while Present
(Formal
) loop
1661 Formal_Typ
:= Etype
(Formal
);
1663 -- From concurrent type to corresponding record
1665 if To_Corresponding
then
1666 if Is_Concurrent_Type
(Formal_Typ
)
1667 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
1668 and then Present
(Interfaces
(
1669 Corresponding_Record_Type
(Formal_Typ
)))
1672 Corresponding_Record_Type
(Formal_Typ
));
1675 -- From corresponding record to concurrent type
1678 if Is_Concurrent_Record_Type
(Formal_Typ
)
1679 and then Present
(Interfaces
(Formal_Typ
))
1682 Corresponding_Concurrent_Type
(Formal_Typ
));
1686 Next_Formal
(Formal
);
1690 -- Start of processing for Disambiguate_Spec
1693 -- Try to retrieve the specification of the body as is. All error
1694 -- messages are suppressed because the body may not have a spec in
1695 -- its current state.
1697 Spec_N
:= Find_Corresponding_Spec
(N
, False);
1699 -- It is possible that this is the body of a primitive declared
1700 -- between a private and a full view of a concurrent type. The
1701 -- controlling parameter of the spec carries the concurrent type,
1702 -- not the corresponding record type as transformed by Analyze_
1703 -- Subprogram_Specification. In such cases, we undo the change
1704 -- made by the analysis of the specification and try to find the
1707 -- Note that wrappers already have their corresponding specs and
1708 -- bodies set during their creation, so if the candidate spec is
1709 -- a wrapper, then we definitely need to swap all types to their
1710 -- original concurrent status.
1713 or else Is_Primitive_Wrapper
(Spec_N
)
1715 -- Restore all references of corresponding record types to the
1716 -- original concurrent types.
1718 Replace_Types
(To_Corresponding
=> False);
1719 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
1721 -- The current body truly belongs to a primitive declared between
1722 -- a private and a full view. We leave the modified body as is,
1723 -- and return the true spec.
1725 if Present
(Priv_Spec
)
1726 and then Is_Private_Primitive
(Priv_Spec
)
1731 -- In case that this is some sort of error, restore the original
1732 -- state of the body.
1734 Replace_Types
(To_Corresponding
=> True);
1738 end Disambiguate_Spec
;
1740 -------------------------------------
1741 -- Is_Private_Concurrent_Primitive --
1742 -------------------------------------
1744 function Is_Private_Concurrent_Primitive
1745 (Subp_Id
: Entity_Id
) return Boolean
1747 Formal_Typ
: Entity_Id
;
1750 if Present
(First_Formal
(Subp_Id
)) then
1751 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
1753 if Is_Concurrent_Record_Type
(Formal_Typ
) then
1754 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
1757 -- The type of the first formal is a concurrent tagged type with
1761 Is_Concurrent_Type
(Formal_Typ
)
1762 and then Is_Tagged_Type
(Formal_Typ
)
1763 and then Has_Private_Declaration
(Formal_Typ
);
1767 end Is_Private_Concurrent_Primitive
;
1769 ----------------------------
1770 -- Set_Trivial_Subprogram --
1771 ----------------------------
1773 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
1774 Nxt
: constant Node_Id
:= Next
(N
);
1777 Set_Is_Trivial_Subprogram
(Body_Id
);
1779 if Present
(Spec_Id
) then
1780 Set_Is_Trivial_Subprogram
(Spec_Id
);
1784 and then Nkind
(Nxt
) = N_Simple_Return_Statement
1785 and then No
(Next
(Nxt
))
1786 and then Present
(Expression
(Nxt
))
1787 and then Is_Entity_Name
(Expression
(Nxt
))
1789 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
1791 end Set_Trivial_Subprogram
;
1793 ---------------------------------
1794 -- Verify_Overriding_Indicator --
1795 ---------------------------------
1797 procedure Verify_Overriding_Indicator
is
1799 if Must_Override
(Body_Spec
) then
1800 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1801 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1805 elsif not Is_Overriding_Operation
(Spec_Id
) then
1807 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
1810 elsif Must_Not_Override
(Body_Spec
) then
1811 if Is_Overriding_Operation
(Spec_Id
) then
1813 ("subprogram& overrides inherited operation",
1814 Body_Spec
, Spec_Id
);
1816 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1817 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1820 ("subprogram & overrides predefined operator ",
1821 Body_Spec
, Spec_Id
);
1823 -- If this is not a primitive operation or protected subprogram,
1824 -- then the overriding indicator is altogether illegal.
1826 elsif not Is_Primitive
(Spec_Id
)
1827 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
1829 Error_Msg_N
("overriding indicator only allowed " &
1830 "if subprogram is primitive",
1834 elsif Style_Check
-- ??? incorrect use of Style_Check!
1835 and then Is_Overriding_Operation
(Spec_Id
)
1837 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
1838 Style
.Missing_Overriding
(N
, Body_Id
);
1840 end Verify_Overriding_Indicator
;
1842 -- Start of processing for Analyze_Subprogram_Body_Helper
1845 -- Generic subprograms are handled separately. They always have a
1846 -- generic specification. Determine whether current scope has a
1847 -- previous declaration.
1849 -- If the subprogram body is defined within an instance of the same
1850 -- name, the instance appears as a package renaming, and will be hidden
1851 -- within the subprogram.
1853 if Present
(Prev_Id
)
1854 and then not Is_Overloadable
(Prev_Id
)
1855 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
1856 or else Comes_From_Source
(Prev_Id
))
1858 if Is_Generic_Subprogram
(Prev_Id
) then
1860 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
1861 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
1863 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
1867 -- Previous entity conflicts with subprogram name. Attempting to
1868 -- enter name will post error.
1870 Enter_Name
(Body_Id
);
1874 -- Non-generic case, find the subprogram declaration, if one was seen,
1875 -- or enter new overloaded entity in the current scope. If the
1876 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
1877 -- part of the context of one of its subunits. No need to redo the
1880 elsif Prev_Id
= Body_Id
1881 and then Has_Completion
(Body_Id
)
1886 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
1888 if Nkind
(N
) = N_Subprogram_Body_Stub
1889 or else No
(Corresponding_Spec
(N
))
1891 if Is_Private_Concurrent_Primitive
(Body_Id
) then
1892 Spec_Id
:= Disambiguate_Spec
;
1894 Spec_Id
:= Find_Corresponding_Spec
(N
);
1897 -- If this is a duplicate body, no point in analyzing it
1899 if Error_Posted
(N
) then
1903 -- A subprogram body should cause freezing of its own declaration,
1904 -- but if there was no previous explicit declaration, then the
1905 -- subprogram will get frozen too late (there may be code within
1906 -- the body that depends on the subprogram having been frozen,
1907 -- such as uses of extra formals), so we force it to be frozen
1908 -- here. Same holds if the body and spec are compilation units.
1909 -- Finally, if the return type is an anonymous access to protected
1910 -- subprogram, it must be frozen before the body because its
1911 -- expansion has generated an equivalent type that is used when
1912 -- elaborating the body.
1914 if No
(Spec_Id
) then
1915 Freeze_Before
(N
, Body_Id
);
1917 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1918 Freeze_Before
(N
, Spec_Id
);
1920 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
1921 Freeze_Before
(N
, Etype
(Body_Id
));
1925 Spec_Id
:= Corresponding_Spec
(N
);
1929 -- Do not inline any subprogram that contains nested subprograms, since
1930 -- the backend inlining circuit seems to generate uninitialized
1931 -- references in this case. We know this happens in the case of front
1932 -- end ZCX support, but it also appears it can happen in other cases as
1933 -- well. The backend often rejects attempts to inline in the case of
1934 -- nested procedures anyway, so little if anything is lost by this.
1935 -- Note that this is test is for the benefit of the back-end. There is
1936 -- a separate test for front-end inlining that also rejects nested
1939 -- Do not do this test if errors have been detected, because in some
1940 -- error cases, this code blows up, and we don't need it anyway if
1941 -- there have been errors, since we won't get to the linker anyway.
1943 if Comes_From_Source
(Body_Id
)
1944 and then Serious_Errors_Detected
= 0
1948 P_Ent
:= Scope
(P_Ent
);
1949 exit when No
(P_Ent
) or else P_Ent
= Standard_Standard
;
1951 if Is_Subprogram
(P_Ent
) then
1952 Set_Is_Inlined
(P_Ent
, False);
1954 if Comes_From_Source
(P_Ent
)
1955 and then Has_Pragma_Inline
(P_Ent
)
1958 ("cannot inline& (nested subprogram)?",
1965 Check_Inline_Pragma
(Spec_Id
);
1967 -- Deal with special case of a fully private operation in the body of
1968 -- the protected type. We must create a declaration for the subprogram,
1969 -- in order to attach the protected subprogram that will be used in
1970 -- internal calls. We exclude compiler generated bodies from the
1971 -- expander since the issue does not arise for those cases.
1974 and then Comes_From_Source
(N
)
1975 and then Is_Protected_Type
(Current_Scope
)
1984 Formal
:= First_Formal
(Body_Id
);
1986 -- The protected operation always has at least one formal, namely
1987 -- the object itself, but it is only placed in the parameter list
1988 -- if expansion is enabled.
1991 or else Expander_Active
1993 Plist
:= Copy_Parameter_List
(Body_Id
);
1998 if Nkind
(Body_Spec
) = N_Procedure_Specification
then
2000 Make_Procedure_Specification
(Loc
,
2001 Defining_Unit_Name
=>
2002 Make_Defining_Identifier
(Sloc
(Body_Id
),
2003 Chars
=> Chars
(Body_Id
)),
2004 Parameter_Specifications
=> Plist
);
2007 Make_Function_Specification
(Loc
,
2008 Defining_Unit_Name
=>
2009 Make_Defining_Identifier
(Sloc
(Body_Id
),
2010 Chars
=> Chars
(Body_Id
)),
2011 Parameter_Specifications
=> Plist
,
2012 Result_Definition
=>
2013 New_Occurrence_Of
(Etype
(Body_Id
), Loc
));
2017 Make_Subprogram_Declaration
(Loc
,
2018 Specification
=> New_Spec
);
2019 Insert_Before
(N
, Decl
);
2020 Spec_Id
:= Defining_Unit_Name
(New_Spec
);
2022 -- Indicate that the entity comes from source, to ensure that
2023 -- cross-reference information is properly generated. The body
2024 -- itself is rewritten during expansion, and the body entity will
2025 -- not appear in calls to the operation.
2027 Set_Comes_From_Source
(Spec_Id
, True);
2029 Set_Has_Completion
(Spec_Id
);
2030 Set_Convention
(Spec_Id
, Convention_Protected
);
2034 -- If a separate spec is present, then deal with freezing issues
2036 if Present
(Spec_Id
) then
2037 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
2038 Verify_Overriding_Indicator
;
2040 -- In general, the spec will be frozen when we start analyzing the
2041 -- body. However, for internally generated operations, such as
2042 -- wrapper functions for inherited operations with controlling
2043 -- results, the spec may not have been frozen by the time we
2044 -- expand the freeze actions that include the bodies. In particular,
2045 -- extra formals for accessibility or for return-in-place may need
2046 -- to be generated. Freeze nodes, if any, are inserted before the
2049 if not Is_Frozen
(Spec_Id
)
2050 and then Expander_Active
2052 -- Force the generation of its freezing node to ensure proper
2053 -- management of access types in the backend.
2055 -- This is definitely needed for some cases, but it is not clear
2056 -- why, to be investigated further???
2058 Set_Has_Delayed_Freeze
(Spec_Id
);
2059 Insert_Actions
(N
, Freeze_Entity
(Spec_Id
, Loc
));
2063 -- Mark presence of postcondition proc in current scope
2065 if Chars
(Body_Id
) = Name_uPostconditions
then
2066 Set_Has_Postconditions
(Current_Scope
);
2069 -- Place subprogram on scope stack, and make formals visible. If there
2070 -- is a spec, the visible entity remains that of the spec.
2072 if Present
(Spec_Id
) then
2073 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
2075 if Is_Child_Unit
(Spec_Id
) then
2076 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
2080 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
2083 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
2084 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
2086 if Is_Abstract_Subprogram
(Spec_Id
) then
2087 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
2091 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
2092 Set_Has_Completion
(Spec_Id
);
2094 if Is_Protected_Type
(Scope
(Spec_Id
)) then
2095 Prot_Typ
:= Scope
(Spec_Id
);
2098 -- If this is a body generated for a renaming, do not check for
2099 -- full conformance. The check is redundant, because the spec of
2100 -- the body is a copy of the spec in the renaming declaration,
2101 -- and the test can lead to spurious errors on nested defaults.
2103 if Present
(Spec_Decl
)
2104 and then not Comes_From_Source
(N
)
2106 (Nkind
(Original_Node
(Spec_Decl
)) =
2107 N_Subprogram_Renaming_Declaration
2108 or else (Present
(Corresponding_Body
(Spec_Decl
))
2110 Nkind
(Unit_Declaration_Node
2111 (Corresponding_Body
(Spec_Decl
))) =
2112 N_Subprogram_Renaming_Declaration
))
2119 Fully_Conformant
, True, Conformant
, Body_Id
);
2122 -- If the body is not fully conformant, we have to decide if we
2123 -- should analyze it or not. If it has a really messed up profile
2124 -- then we probably should not analyze it, since we will get too
2125 -- many bogus messages.
2127 -- Our decision is to go ahead in the non-fully conformant case
2128 -- only if it is at least mode conformant with the spec. Note
2129 -- that the call to Check_Fully_Conformant has issued the proper
2130 -- error messages to complain about the lack of conformance.
2133 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
2139 if Spec_Id
/= Body_Id
then
2140 Reference_Body_Formals
(Spec_Id
, Body_Id
);
2143 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2144 Set_Corresponding_Spec
(N
, Spec_Id
);
2146 -- Ada 2005 (AI-345): If the operation is a primitive operation
2147 -- of a concurrent type, the type of the first parameter has been
2148 -- replaced with the corresponding record, which is the proper
2149 -- run-time structure to use. However, within the body there may
2150 -- be uses of the formals that depend on primitive operations
2151 -- of the type (in particular calls in prefixed form) for which
2152 -- we need the original concurrent type. The operation may have
2153 -- several controlling formals, so the replacement must be done
2156 if Comes_From_Source
(Spec_Id
)
2157 and then Present
(First_Entity
(Spec_Id
))
2158 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
2159 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
2161 Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
2164 (Corresponding_Concurrent_Type
2165 (Etype
(First_Entity
(Spec_Id
))))
2168 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
2172 Form
:= First_Formal
(Spec_Id
);
2173 while Present
(Form
) loop
2174 if Etype
(Form
) = Typ
then
2175 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
2183 -- Make the formals visible, and place subprogram on scope stack.
2184 -- This is also the point at which we set Last_Real_Spec_Entity
2185 -- to mark the entities which will not be moved to the body.
2187 Install_Formals
(Spec_Id
);
2188 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
2189 Push_Scope
(Spec_Id
);
2191 -- Make sure that the subprogram is immediately visible. For
2192 -- child units that have no separate spec this is indispensable.
2193 -- Otherwise it is safe albeit redundant.
2195 Set_Is_Immediately_Visible
(Spec_Id
);
2198 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
2199 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
2200 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
2201 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
2203 -- Case of subprogram body with no previous spec
2207 and then Comes_From_Source
(Body_Id
)
2208 and then not Suppress_Style_Checks
(Body_Id
)
2209 and then not In_Instance
2211 Style
.Body_With_No_Spec
(N
);
2214 New_Overloaded_Entity
(Body_Id
);
2216 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2217 Set_Acts_As_Spec
(N
);
2218 Generate_Definition
(Body_Id
);
2220 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
2221 Generate_Reference_To_Formals
(Body_Id
);
2222 Install_Formals
(Body_Id
);
2223 Push_Scope
(Body_Id
);
2227 -- If the return type is an anonymous access type whose designated type
2228 -- is the limited view of a class-wide type and the non-limited view is
2229 -- available, update the return type accordingly.
2231 if Ada_Version
>= Ada_05
2232 and then Comes_From_Source
(N
)
2239 Rtyp
:= Etype
(Current_Scope
);
2241 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
2242 Etyp
:= Directly_Designated_Type
(Rtyp
);
2244 if Is_Class_Wide_Type
(Etyp
)
2245 and then From_With_Type
(Etyp
)
2247 Set_Directly_Designated_Type
2248 (Etype
(Current_Scope
), Available_View
(Etyp
));
2254 -- If this is the proper body of a stub, we must verify that the stub
2255 -- conforms to the body, and to the previous spec if one was present.
2256 -- we know already that the body conforms to that spec. This test is
2257 -- only required for subprograms that come from source.
2259 if Nkind
(Parent
(N
)) = N_Subunit
2260 and then Comes_From_Source
(N
)
2261 and then not Error_Posted
(Body_Id
)
2262 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
2263 N_Subprogram_Body_Stub
2266 Old_Id
: constant Entity_Id
:=
2268 (Specification
(Corresponding_Stub
(Parent
(N
))));
2270 Conformant
: Boolean := False;
2273 if No
(Spec_Id
) then
2274 Check_Fully_Conformant
(Body_Id
, Old_Id
);
2278 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
2280 if not Conformant
then
2282 -- The stub was taken to be a new declaration. Indicate
2283 -- that it lacks a body.
2285 Set_Has_Completion
(Old_Id
, False);
2291 Set_Has_Completion
(Body_Id
);
2292 Check_Eliminated
(Body_Id
);
2294 if Nkind
(N
) = N_Subprogram_Body_Stub
then
2297 elsif Present
(Spec_Id
)
2298 and then Expander_Active
2300 (Has_Pragma_Inline_Always
(Spec_Id
)
2301 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
))
2303 Build_Body_To_Inline
(N
, Spec_Id
);
2306 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2307 -- if its specification we have to install the private withed units.
2308 -- This holds for child units as well.
2310 if Is_Compilation_Unit
(Body_Id
)
2311 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
2313 Install_Private_With_Clauses
(Body_Id
);
2316 Check_Anonymous_Return
;
2318 -- Set the Protected_Formal field of each extra formal of the protected
2319 -- subprogram to reference the corresponding extra formal of the
2320 -- subprogram that implements it. For regular formals this occurs when
2321 -- the protected subprogram's declaration is expanded, but the extra
2322 -- formals don't get created until the subprogram is frozen. We need to
2323 -- do this before analyzing the protected subprogram's body so that any
2324 -- references to the original subprogram's extra formals will be changed
2325 -- refer to the implementing subprogram's formals (see Expand_Formal).
2327 if Present
(Spec_Id
)
2328 and then Is_Protected_Type
(Scope
(Spec_Id
))
2329 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
2332 Impl_Subp
: constant Entity_Id
:=
2333 Protected_Body_Subprogram
(Spec_Id
);
2334 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
2335 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
2337 while Present
(Prot_Ext_Formal
) loop
2338 pragma Assert
(Present
(Impl_Ext_Formal
));
2339 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
2340 Next_Formal_With_Extras
(Prot_Ext_Formal
);
2341 Next_Formal_With_Extras
(Impl_Ext_Formal
);
2346 -- Now we can go on to analyze the body
2348 HSS
:= Handled_Statement_Sequence
(N
);
2349 Set_Actual_Subtypes
(N
, Current_Scope
);
2351 -- Deal with preconditions and postconditions
2353 Process_PPCs
(N
, Spec_Id
, Body_Id
);
2355 -- Add a declaration for the Protection object, renaming declarations
2356 -- for discriminals and privals and finally a declaration for the entry
2357 -- family index (if applicable). This form of early expansion is done
2358 -- when the Expander is active because Install_Private_Data_Declarations
2359 -- references entities which were created during regular expansion.
2362 and then Comes_From_Source
(N
)
2363 and then Present
(Prot_Typ
)
2364 and then Present
(Spec_Id
)
2365 and then not Is_Eliminated
(Spec_Id
)
2367 Install_Private_Data_Declarations
2368 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
2371 -- Analyze the declarations (this call will analyze the precondition
2372 -- Check pragmas we prepended to the list, as well as the declaration
2373 -- of the _Postconditions procedure).
2375 Analyze_Declarations
(Declarations
(N
));
2377 -- Check completion, and analyze the statements
2380 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
2383 -- Deal with end of scope processing for the body
2385 Process_End_Label
(HSS
, 't', Current_Scope
);
2387 Check_Subprogram_Order
(N
);
2388 Set_Analyzed
(Body_Id
);
2390 -- If we have a separate spec, then the analysis of the declarations
2391 -- caused the entities in the body to be chained to the spec id, but
2392 -- we want them chained to the body id. Only the formal parameters
2393 -- end up chained to the spec id in this case.
2395 if Present
(Spec_Id
) then
2397 -- We must conform to the categorization of our spec
2399 Validate_Categorization_Dependency
(N
, Spec_Id
);
2401 -- And if this is a child unit, the parent units must conform
2403 if Is_Child_Unit
(Spec_Id
) then
2404 Validate_Categorization_Dependency
2405 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
2408 -- Here is where we move entities from the spec to the body
2410 -- Case where there are entities that stay with the spec
2412 if Present
(Last_Real_Spec_Entity
) then
2414 -- No body entities (happens when the only real spec entities
2415 -- come from precondition and postcondition pragmas)
2417 if No
(Last_Entity
(Body_Id
)) then
2419 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
2421 -- Body entities present (formals), so chain stuff past them
2425 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
2428 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
2429 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2430 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
2432 -- Case where there are no spec entities, in this case there can
2433 -- be no body entities either, so just move everything.
2436 pragma Assert
(No
(Last_Entity
(Body_Id
)));
2437 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
2438 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2439 Set_First_Entity
(Spec_Id
, Empty
);
2440 Set_Last_Entity
(Spec_Id
, Empty
);
2444 -- If function, check return statements
2446 if Nkind
(Body_Spec
) = N_Function_Specification
then
2451 if Present
(Spec_Id
) then
2457 if Return_Present
(Id
) then
2458 Check_Returns
(HSS
, 'F', Missing_Ret
);
2461 Set_Has_Missing_Return
(Id
);
2464 elsif not Is_Machine_Code_Subprogram
(Id
)
2465 and then not Body_Deleted
2467 Error_Msg_N
("missing RETURN statement in function body", N
);
2471 -- If procedure with No_Return, check returns
2473 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2474 and then Present
(Spec_Id
)
2475 and then No_Return
(Spec_Id
)
2477 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2480 -- Now we are going to check for variables that are never modified in
2481 -- the body of the procedure. But first we deal with a special case
2482 -- where we want to modify this check. If the body of the subprogram
2483 -- starts with a raise statement or its equivalent, or if the body
2484 -- consists entirely of a null statement, then it is pretty obvious
2485 -- that it is OK to not reference the parameters. For example, this
2486 -- might be the following common idiom for a stubbed function:
2487 -- statement of the procedure raises an exception. In particular this
2488 -- deals with the common idiom of a stubbed function, which might
2489 -- appear as something like
2491 -- function F (A : Integer) return Some_Type;
2494 -- raise Program_Error;
2498 -- Here the purpose of X is simply to satisfy the annoying requirement
2499 -- in Ada that there be at least one return, and we certainly do not
2500 -- want to go posting warnings on X that it is not initialized! On
2501 -- the other hand, if X is entirely unreferenced that should still
2504 -- What we do is to detect these cases, and if we find them, flag the
2505 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2506 -- suppress unwanted warnings. For the case of the function stub above
2507 -- we have a special test to set X as apparently assigned to suppress
2514 -- Skip initial labels (for one thing this occurs when we are in
2515 -- front end ZCX mode, but in any case it is irrelevant), and also
2516 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2518 Stm
:= First
(Statements
(HSS
));
2519 while Nkind
(Stm
) = N_Label
2520 or else Nkind
(Stm
) in N_Push_xxx_Label
2525 -- Do the test on the original statement before expansion
2528 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
2531 -- If explicit raise statement, turn on flag
2533 if Nkind
(Ostm
) = N_Raise_Statement
then
2534 Set_Trivial_Subprogram
(Stm
);
2536 -- If null statement, and no following statements, turn on flag
2538 elsif Nkind
(Stm
) = N_Null_Statement
2539 and then Comes_From_Source
(Stm
)
2540 and then No
(Next
(Stm
))
2542 Set_Trivial_Subprogram
(Stm
);
2544 -- Check for explicit call cases which likely raise an exception
2546 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
2547 if Is_Entity_Name
(Name
(Ostm
)) then
2549 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
2552 -- If the procedure is marked No_Return, then likely it
2553 -- raises an exception, but in any case it is not coming
2554 -- back here, so turn on the flag.
2556 if Ekind
(Ent
) = E_Procedure
2557 and then No_Return
(Ent
)
2559 Set_Trivial_Subprogram
(Stm
);
2567 -- Check for variables that are never modified
2573 -- If there is a separate spec, then transfer Never_Set_In_Source
2574 -- flags from out parameters to the corresponding entities in the
2575 -- body. The reason we do that is we want to post error flags on
2576 -- the body entities, not the spec entities.
2578 if Present
(Spec_Id
) then
2579 E1
:= First_Entity
(Spec_Id
);
2580 while Present
(E1
) loop
2581 if Ekind
(E1
) = E_Out_Parameter
then
2582 E2
:= First_Entity
(Body_Id
);
2583 while Present
(E2
) loop
2584 exit when Chars
(E1
) = Chars
(E2
);
2588 if Present
(E2
) then
2589 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
2597 -- Check references in body unless it was deleted. Note that the
2598 -- check of Body_Deleted here is not just for efficiency, it is
2599 -- necessary to avoid junk warnings on formal parameters.
2601 if not Body_Deleted
then
2602 Check_References
(Body_Id
);
2605 end Analyze_Subprogram_Body_Helper
;
2607 ------------------------------------
2608 -- Analyze_Subprogram_Declaration --
2609 ------------------------------------
2611 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
2612 Loc
: constant Source_Ptr
:= Sloc
(N
);
2613 Designator
: Entity_Id
;
2615 Scop
: constant Entity_Id
:= Current_Scope
;
2616 Null_Body
: Node_Id
:= Empty
;
2618 -- Start of processing for Analyze_Subprogram_Declaration
2621 -- For a null procedure, capture the profile before analysis, for
2622 -- expansion at the freeze point and at each point of call.
2623 -- The body will only be used if the procedure has preconditions.
2624 -- In that case the body is analyzed at the freeze point.
2626 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2627 and then Null_Present
(Specification
(N
))
2628 and then Expander_Active
2631 Make_Subprogram_Body
(Loc
,
2633 New_Copy_Tree
(Specification
(N
)),
2636 Handled_Statement_Sequence
=>
2637 Make_Handled_Sequence_Of_Statements
(Loc
,
2638 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
2640 -- Create new entities for body and formals
2642 Set_Defining_Unit_Name
(Specification
(Null_Body
),
2643 Make_Defining_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2644 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
2646 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
2647 while Present
(Form
) loop
2648 Set_Defining_Identifier
(Form
,
2649 Make_Defining_Identifier
(Loc
,
2650 Chars
(Defining_Identifier
(Form
))));
2654 if Is_Protected_Type
(Current_Scope
) then
2656 ("protected operation cannot be a null procedure", N
);
2660 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
2661 Generate_Definition
(Designator
);
2663 if Debug_Flag_C
then
2664 Write_Str
("==> subprogram spec ");
2665 Write_Name
(Chars
(Designator
));
2666 Write_Str
(" from ");
2667 Write_Location
(Sloc
(N
));
2672 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2673 and then Null_Present
(Specification
(N
))
2675 Set_Has_Completion
(Designator
);
2677 if Present
(Null_Body
) then
2678 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
2679 Set_Body_To_Inline
(N
, Null_Body
);
2680 Set_Is_Inlined
(Designator
);
2684 Validate_RCI_Subprogram_Declaration
(N
);
2685 New_Overloaded_Entity
(Designator
);
2686 Check_Delayed_Subprogram
(Designator
);
2688 -- If the type of the first formal of the current subprogram is a
2689 -- nongeneric tagged private type, mark the subprogram as being a
2690 -- private primitive. Ditto if this is a function with controlling
2691 -- result, and the return type is currently private.
2693 if Has_Controlling_Result
(Designator
)
2694 and then Is_Private_Type
(Etype
(Designator
))
2695 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
2697 Set_Is_Private_Primitive
(Designator
);
2699 elsif Present
(First_Formal
(Designator
)) then
2701 Formal_Typ
: constant Entity_Id
:=
2702 Etype
(First_Formal
(Designator
));
2704 Set_Is_Private_Primitive
(Designator
,
2705 Is_Tagged_Type
(Formal_Typ
)
2706 and then Is_Private_Type
(Formal_Typ
)
2707 and then not Is_Generic_Actual_Type
(Formal_Typ
));
2711 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2714 if Ada_Version
>= Ada_05
2715 and then Comes_From_Source
(N
)
2716 and then Is_Dispatching_Operation
(Designator
)
2723 if Has_Controlling_Result
(Designator
) then
2724 Etyp
:= Etype
(Designator
);
2727 E
:= First_Entity
(Designator
);
2729 and then Is_Formal
(E
)
2730 and then not Is_Controlling_Formal
(E
)
2738 if Is_Access_Type
(Etyp
) then
2739 Etyp
:= Directly_Designated_Type
(Etyp
);
2742 if Is_Interface
(Etyp
)
2743 and then not Is_Abstract_Subprogram
(Designator
)
2744 and then not (Ekind
(Designator
) = E_Procedure
2745 and then Null_Present
(Specification
(N
)))
2747 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
2749 ("(Ada 2005) interface subprogram % must be abstract or null",
2755 -- What is the following code for, it used to be
2757 -- ??? Set_Suppress_Elaboration_Checks
2758 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2760 -- The following seems equivalent, but a bit dubious
2762 if Elaboration_Checks_Suppressed
(Designator
) then
2763 Set_Kill_Elaboration_Checks
(Designator
);
2766 if Scop
/= Standard_Standard
2767 and then not Is_Child_Unit
(Designator
)
2769 Set_Categorization_From_Scope
(Designator
, Scop
);
2771 -- For a compilation unit, check for library-unit pragmas
2773 Push_Scope
(Designator
);
2774 Set_Categorization_From_Pragmas
(N
);
2775 Validate_Categorization_Dependency
(N
, Designator
);
2779 -- For a compilation unit, set body required. This flag will only be
2780 -- reset if a valid Import or Interface pragma is processed later on.
2782 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2783 Set_Body_Required
(Parent
(N
), True);
2785 if Ada_Version
>= Ada_05
2786 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
2787 and then Null_Present
(Specification
(N
))
2790 ("null procedure cannot be declared at library level", N
);
2794 Generate_Reference_To_Formals
(Designator
);
2795 Check_Eliminated
(Designator
);
2797 if Debug_Flag_C
then
2799 Write_Str
("<== subprogram spec ");
2800 Write_Name
(Chars
(Designator
));
2801 Write_Str
(" from ");
2802 Write_Location
(Sloc
(N
));
2805 end Analyze_Subprogram_Declaration
;
2807 --------------------------------------
2808 -- Analyze_Subprogram_Specification --
2809 --------------------------------------
2811 -- Reminder: N here really is a subprogram specification (not a subprogram
2812 -- declaration). This procedure is called to analyze the specification in
2813 -- both subprogram bodies and subprogram declarations (specs).
2815 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
2816 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2817 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
2819 -- Start of processing for Analyze_Subprogram_Specification
2822 Generate_Definition
(Designator
);
2824 if Nkind
(N
) = N_Function_Specification
then
2825 Set_Ekind
(Designator
, E_Function
);
2826 Set_Mechanism
(Designator
, Default_Mechanism
);
2829 Set_Ekind
(Designator
, E_Procedure
);
2830 Set_Etype
(Designator
, Standard_Void_Type
);
2833 -- Introduce new scope for analysis of the formals and the return type
2835 Set_Scope
(Designator
, Current_Scope
);
2837 if Present
(Formals
) then
2838 Push_Scope
(Designator
);
2839 Process_Formals
(Formals
, N
);
2841 -- Ada 2005 (AI-345): If this is an overriding operation of an
2842 -- inherited interface operation, and the controlling type is
2843 -- a synchronized type, replace the type with its corresponding
2844 -- record, to match the proper signature of an overriding operation.
2845 -- Same processing for an access parameter whose designated type is
2846 -- derived from a synchronized interface.
2848 if Ada_Version
>= Ada_05
then
2851 Formal_Typ
: Entity_Id
;
2852 Rec_Typ
: Entity_Id
;
2853 Desig_Typ
: Entity_Id
;
2856 Formal
:= First_Formal
(Designator
);
2857 while Present
(Formal
) loop
2858 Formal_Typ
:= Etype
(Formal
);
2860 if Is_Concurrent_Type
(Formal_Typ
)
2861 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2863 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
2865 if Present
(Interfaces
(Rec_Typ
)) then
2866 Set_Etype
(Formal
, Rec_Typ
);
2869 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
2870 Desig_Typ
:= Designated_Type
(Formal_Typ
);
2872 if Is_Concurrent_Type
(Desig_Typ
)
2873 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
2875 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
2877 if Present
(Interfaces
(Rec_Typ
)) then
2878 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
2883 Next_Formal
(Formal
);
2890 -- The subprogram scope is pushed and popped around the processing of
2891 -- the return type for consistency with call above to Process_Formals
2892 -- (which itself can call Analyze_Return_Type), and to ensure that any
2893 -- itype created for the return type will be associated with the proper
2896 elsif Nkind
(N
) = N_Function_Specification
then
2897 Push_Scope
(Designator
);
2899 Analyze_Return_Type
(N
);
2904 if Nkind
(N
) = N_Function_Specification
then
2905 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
2906 Valid_Operator_Definition
(Designator
);
2909 May_Need_Actuals
(Designator
);
2911 -- Ada 2005 (AI-251): If the return type is abstract, verify that
2912 -- the subprogram is abstract also. This does not apply to renaming
2913 -- declarations, where abstractness is inherited.
2914 -- In case of primitives associated with abstract interface types
2915 -- the check is applied later (see Analyze_Subprogram_Declaration).
2917 if Is_Abstract_Type
(Etype
(Designator
))
2918 and then not Is_Interface
(Etype
(Designator
))
2919 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
2920 and then Nkind
(Parent
(N
)) /=
2921 N_Abstract_Subprogram_Declaration
2923 (Nkind
(Parent
(N
))) /= N_Formal_Abstract_Subprogram_Declaration
2926 ("function that returns abstract type must be abstract", N
);
2931 end Analyze_Subprogram_Specification
;
2933 --------------------------
2934 -- Build_Body_To_Inline --
2935 --------------------------
2937 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
) is
2938 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
2939 Original_Body
: Node_Id
;
2940 Body_To_Analyze
: Node_Id
;
2941 Max_Size
: constant := 10;
2942 Stat_Count
: Integer := 0;
2944 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean;
2945 -- Check for declarations that make inlining not worthwhile
2947 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean;
2948 -- Check for statements that make inlining not worthwhile: any tasking
2949 -- statement, nested at any level. Keep track of total number of
2950 -- elementary statements, as a measure of acceptable size.
2952 function Has_Pending_Instantiation
return Boolean;
2953 -- If some enclosing body contains instantiations that appear before the
2954 -- corresponding generic body, the enclosing body has a freeze node so
2955 -- that it can be elaborated after the generic itself. This might
2956 -- conflict with subsequent inlinings, so that it is unsafe to try to
2957 -- inline in such a case.
2959 function Has_Single_Return
return Boolean;
2960 -- In general we cannot inline functions that return unconstrained type.
2961 -- However, we can handle such functions if all return statements return
2962 -- a local variable that is the only declaration in the body of the
2963 -- function. In that case the call can be replaced by that local
2964 -- variable as is done for other inlined calls.
2966 procedure Remove_Pragmas
;
2967 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
2968 -- parameter has no meaning when the body is inlined and the formals
2969 -- are rewritten. Remove it from body to inline. The analysis of the
2970 -- non-inlined body will handle the pragma properly.
2972 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean;
2973 -- If the body of the subprogram includes a call that returns an
2974 -- unconstrained type, the secondary stack is involved, and it
2975 -- is not worth inlining.
2977 ------------------------------
2978 -- Has_Excluded_Declaration --
2979 ------------------------------
2981 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean is
2984 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean;
2985 -- Nested subprograms make a given body ineligible for inlining, but
2986 -- we make an exception for instantiations of unchecked conversion.
2987 -- The body has not been analyzed yet, so check the name, and verify
2988 -- that the visible entity with that name is the predefined unit.
2990 -----------------------------
2991 -- Is_Unchecked_Conversion --
2992 -----------------------------
2994 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean is
2995 Id
: constant Node_Id
:= Name
(D
);
2999 if Nkind
(Id
) = N_Identifier
3000 and then Chars
(Id
) = Name_Unchecked_Conversion
3002 Conv
:= Current_Entity
(Id
);
3004 elsif Nkind_In
(Id
, N_Selected_Component
, N_Expanded_Name
)
3005 and then Chars
(Selector_Name
(Id
)) = Name_Unchecked_Conversion
3007 Conv
:= Current_Entity
(Selector_Name
(Id
));
3012 return Present
(Conv
)
3013 and then Is_Predefined_File_Name
3014 (Unit_File_Name
(Get_Source_Unit
(Conv
)))
3015 and then Is_Intrinsic_Subprogram
(Conv
);
3016 end Is_Unchecked_Conversion
;
3018 -- Start of processing for Has_Excluded_Declaration
3022 while Present
(D
) loop
3023 if (Nkind
(D
) = N_Function_Instantiation
3024 and then not Is_Unchecked_Conversion
(D
))
3025 or else Nkind_In
(D
, N_Protected_Type_Declaration
,
3026 N_Package_Declaration
,
3027 N_Package_Instantiation
,
3029 N_Procedure_Instantiation
,
3030 N_Task_Type_Declaration
)
3033 ("cannot inline & (non-allowed declaration)?", D
, Subp
);
3041 end Has_Excluded_Declaration
;
3043 ----------------------------
3044 -- Has_Excluded_Statement --
3045 ----------------------------
3047 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean is
3053 while Present
(S
) loop
3054 Stat_Count
:= Stat_Count
+ 1;
3056 if Nkind_In
(S
, N_Abort_Statement
,
3057 N_Asynchronous_Select
,
3058 N_Conditional_Entry_Call
,
3059 N_Delay_Relative_Statement
,
3060 N_Delay_Until_Statement
,
3065 ("cannot inline & (non-allowed statement)?", S
, Subp
);
3068 elsif Nkind
(S
) = N_Block_Statement
then
3069 if Present
(Declarations
(S
))
3070 and then Has_Excluded_Declaration
(Declarations
(S
))
3074 elsif Present
(Handled_Statement_Sequence
(S
))
3077 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
3079 Has_Excluded_Statement
3080 (Statements
(Handled_Statement_Sequence
(S
))))
3085 elsif Nkind
(S
) = N_Case_Statement
then
3086 E
:= First
(Alternatives
(S
));
3087 while Present
(E
) loop
3088 if Has_Excluded_Statement
(Statements
(E
)) then
3095 elsif Nkind
(S
) = N_If_Statement
then
3096 if Has_Excluded_Statement
(Then_Statements
(S
)) then
3100 if Present
(Elsif_Parts
(S
)) then
3101 E
:= First
(Elsif_Parts
(S
));
3102 while Present
(E
) loop
3103 if Has_Excluded_Statement
(Then_Statements
(E
)) then
3110 if Present
(Else_Statements
(S
))
3111 and then Has_Excluded_Statement
(Else_Statements
(S
))
3116 elsif Nkind
(S
) = N_Loop_Statement
3117 and then Has_Excluded_Statement
(Statements
(S
))
3126 end Has_Excluded_Statement
;
3128 -------------------------------
3129 -- Has_Pending_Instantiation --
3130 -------------------------------
3132 function Has_Pending_Instantiation
return Boolean is
3137 while Present
(S
) loop
3138 if Is_Compilation_Unit
(S
)
3139 or else Is_Child_Unit
(S
)
3142 elsif Ekind
(S
) = E_Package
3143 and then Has_Forward_Instantiation
(S
)
3152 end Has_Pending_Instantiation
;
3154 ------------------------
3155 -- Has_Single_Return --
3156 ------------------------
3158 function Has_Single_Return
return Boolean is
3159 Return_Statement
: Node_Id
:= Empty
;
3161 function Check_Return
(N
: Node_Id
) return Traverse_Result
;
3167 function Check_Return
(N
: Node_Id
) return Traverse_Result
is
3169 if Nkind
(N
) = N_Simple_Return_Statement
then
3170 if Present
(Expression
(N
))
3171 and then Is_Entity_Name
(Expression
(N
))
3173 if No
(Return_Statement
) then
3174 Return_Statement
:= N
;
3177 elsif Chars
(Expression
(N
)) =
3178 Chars
(Expression
(Return_Statement
))
3187 -- Expression has wrong form
3197 function Check_All_Returns
is new Traverse_Func
(Check_Return
);
3199 -- Start of processing for Has_Single_Return
3202 return Check_All_Returns
(N
) = OK
3203 and then Present
(Declarations
(N
))
3204 and then Present
(First
(Declarations
(N
)))
3205 and then Chars
(Expression
(Return_Statement
)) =
3206 Chars
(Defining_Identifier
(First
(Declarations
(N
))));
3207 end Has_Single_Return
;
3209 --------------------
3210 -- Remove_Pragmas --
3211 --------------------
3213 procedure Remove_Pragmas
is
3218 Decl
:= First
(Declarations
(Body_To_Analyze
));
3219 while Present
(Decl
) loop
3222 if Nkind
(Decl
) = N_Pragma
3223 and then (Pragma_Name
(Decl
) = Name_Unreferenced
3225 Pragma_Name
(Decl
) = Name_Unmodified
)
3234 --------------------------
3235 -- Uses_Secondary_Stack --
3236 --------------------------
3238 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean is
3239 function Check_Call
(N
: Node_Id
) return Traverse_Result
;
3240 -- Look for function calls that return an unconstrained type
3246 function Check_Call
(N
: Node_Id
) return Traverse_Result
is
3248 if Nkind
(N
) = N_Function_Call
3249 and then Is_Entity_Name
(Name
(N
))
3250 and then Is_Composite_Type
(Etype
(Entity
(Name
(N
))))
3251 and then not Is_Constrained
(Etype
(Entity
(Name
(N
))))
3254 ("cannot inline & (call returns unconstrained type)?",
3262 function Check_Calls
is new Traverse_Func
(Check_Call
);
3265 return Check_Calls
(Bod
) = Abandon
;
3266 end Uses_Secondary_Stack
;
3268 -- Start of processing for Build_Body_To_Inline
3271 -- Return immediately if done already
3273 if Nkind
(Decl
) = N_Subprogram_Declaration
3274 and then Present
(Body_To_Inline
(Decl
))
3278 -- Functions that return unconstrained composite types require
3279 -- secondary stack handling, and cannot currently be inlined, unless
3280 -- all return statements return a local variable that is the first
3281 -- local declaration in the body.
3283 elsif Ekind
(Subp
) = E_Function
3284 and then not Is_Scalar_Type
(Etype
(Subp
))
3285 and then not Is_Access_Type
(Etype
(Subp
))
3286 and then not Is_Constrained
(Etype
(Subp
))
3288 if not Has_Single_Return
then
3290 ("cannot inline & (unconstrained return type)?", N
, Subp
);
3294 -- Ditto for functions that return controlled types, where controlled
3295 -- actions interfere in complex ways with inlining.
3297 elsif Ekind
(Subp
) = E_Function
3298 and then Needs_Finalization
(Etype
(Subp
))
3301 ("cannot inline & (controlled return type)?", N
, Subp
);
3305 if Present
(Declarations
(N
))
3306 and then Has_Excluded_Declaration
(Declarations
(N
))
3311 if Present
(Handled_Statement_Sequence
(N
)) then
3312 if Present
(Exception_Handlers
(Handled_Statement_Sequence
(N
))) then
3314 ("cannot inline& (exception handler)?",
3315 First
(Exception_Handlers
(Handled_Statement_Sequence
(N
))),
3319 Has_Excluded_Statement
3320 (Statements
(Handled_Statement_Sequence
(N
)))
3326 -- We do not inline a subprogram that is too large, unless it is
3327 -- marked Inline_Always. This pragma does not suppress the other
3328 -- checks on inlining (forbidden declarations, handlers, etc).
3330 if Stat_Count
> Max_Size
3331 and then not Has_Pragma_Inline_Always
(Subp
)
3333 Cannot_Inline
("cannot inline& (body too large)?", N
, Subp
);
3337 if Has_Pending_Instantiation
then
3339 ("cannot inline& (forward instance within enclosing body)?",
3344 -- Within an instance, the body to inline must be treated as a nested
3345 -- generic, so that the proper global references are preserved.
3347 -- Note that we do not do this at the library level, because it is not
3348 -- needed, and furthermore this causes trouble if front end inlining
3349 -- is activated (-gnatN).
3351 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3352 Save_Env
(Scope
(Current_Scope
), Scope
(Current_Scope
));
3353 Original_Body
:= Copy_Generic_Node
(N
, Empty
, True);
3355 Original_Body
:= Copy_Separate_Tree
(N
);
3358 -- We need to capture references to the formals in order to substitute
3359 -- the actuals at the point of inlining, i.e. instantiation. To treat
3360 -- the formals as globals to the body to inline, we nest it within
3361 -- a dummy parameterless subprogram, declared within the real one.
3362 -- To avoid generating an internal name (which is never public, and
3363 -- which affects serial numbers of other generated names), we use
3364 -- an internal symbol that cannot conflict with user declarations.
3366 Set_Parameter_Specifications
(Specification
(Original_Body
), No_List
);
3367 Set_Defining_Unit_Name
3368 (Specification
(Original_Body
),
3369 Make_Defining_Identifier
(Sloc
(N
), Name_uParent
));
3370 Set_Corresponding_Spec
(Original_Body
, Empty
);
3372 Body_To_Analyze
:= Copy_Generic_Node
(Original_Body
, Empty
, False);
3374 -- Set return type of function, which is also global and does not need
3377 if Ekind
(Subp
) = E_Function
then
3378 Set_Result_Definition
(Specification
(Body_To_Analyze
),
3379 New_Occurrence_Of
(Etype
(Subp
), Sloc
(N
)));
3382 if No
(Declarations
(N
)) then
3383 Set_Declarations
(N
, New_List
(Body_To_Analyze
));
3385 Append
(Body_To_Analyze
, Declarations
(N
));
3388 Expander_Mode_Save_And_Set
(False);
3391 Analyze
(Body_To_Analyze
);
3392 Push_Scope
(Defining_Entity
(Body_To_Analyze
));
3393 Save_Global_References
(Original_Body
);
3395 Remove
(Body_To_Analyze
);
3397 Expander_Mode_Restore
;
3399 -- Restore environment if previously saved
3401 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3405 -- If secondary stk used there is no point in inlining. We have
3406 -- already issued the warning in this case, so nothing to do.
3408 if Uses_Secondary_Stack
(Body_To_Analyze
) then
3412 Set_Body_To_Inline
(Decl
, Original_Body
);
3413 Set_Ekind
(Defining_Entity
(Original_Body
), Ekind
(Subp
));
3414 Set_Is_Inlined
(Subp
);
3415 end Build_Body_To_Inline
;
3421 procedure Cannot_Inline
(Msg
: String; N
: Node_Id
; Subp
: Entity_Id
) is
3423 -- Do not emit warning if this is a predefined unit which is not
3424 -- the main unit. With validity checks enabled, some predefined
3425 -- subprograms may contain nested subprograms and become ineligible
3428 if Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(Subp
)))
3429 and then not In_Extended_Main_Source_Unit
(Subp
)
3433 elsif Has_Pragma_Inline_Always
(Subp
) then
3435 -- Remove last character (question mark) to make this into an error,
3436 -- because the Inline_Always pragma cannot be obeyed.
3438 Error_Msg_NE
(Msg
(Msg
'First .. Msg
'Last - 1), N
, Subp
);
3440 elsif Ineffective_Inline_Warnings
then
3441 Error_Msg_NE
(Msg
, N
, Subp
);
3445 -----------------------
3446 -- Check_Conformance --
3447 -----------------------
3449 procedure Check_Conformance
3450 (New_Id
: Entity_Id
;
3452 Ctype
: Conformance_Type
;
3454 Conforms
: out Boolean;
3455 Err_Loc
: Node_Id
:= Empty
;
3456 Get_Inst
: Boolean := False;
3457 Skip_Controlling_Formals
: Boolean := False)
3459 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
3460 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
3461 -- If Errmsg is True, then processing continues to post an error message
3462 -- for conformance error on given node. Two messages are output. The
3463 -- first message points to the previous declaration with a general "no
3464 -- conformance" message. The second is the detailed reason, supplied as
3465 -- Msg. The parameter N provide information for a possible & insertion
3466 -- in the message, and also provides the location for posting the
3467 -- message in the absence of a specified Err_Loc location.
3469 -----------------------
3470 -- Conformance_Error --
3471 -----------------------
3473 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
3480 if No
(Err_Loc
) then
3486 Error_Msg_Sloc
:= Sloc
(Old_Id
);
3489 when Type_Conformant
=>
3490 Error_Msg_N
-- CODEFIX
3491 ("not type conformant with declaration#!", Enode
);
3493 when Mode_Conformant
=>
3494 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3495 Error_Msg_N
-- CODEFIX???
3496 ("not mode conformant with operation inherited#!",
3499 Error_Msg_N
-- CODEFIX???
3500 ("not mode conformant with declaration#!", Enode
);
3503 when Subtype_Conformant
=>
3504 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3505 Error_Msg_N
-- CODEFIX???
3506 ("not subtype conformant with operation inherited#!",
3509 Error_Msg_N
-- CODEFIX???
3510 ("not subtype conformant with declaration#!", Enode
);
3513 when Fully_Conformant
=>
3514 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3515 Error_Msg_N
-- CODEFIX
3516 ("not fully conformant with operation inherited#!",
3519 Error_Msg_N
-- CODEFIX
3520 ("not fully conformant with declaration#!", Enode
);
3524 Error_Msg_NE
(Msg
, Enode
, N
);
3526 end Conformance_Error
;
3530 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
3531 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
3532 Old_Formal
: Entity_Id
;
3533 New_Formal
: Entity_Id
;
3534 Access_Types_Match
: Boolean;
3535 Old_Formal_Base
: Entity_Id
;
3536 New_Formal_Base
: Entity_Id
;
3538 -- Start of processing for Check_Conformance
3543 -- We need a special case for operators, since they don't appear
3546 if Ctype
= Type_Conformant
then
3547 if Ekind
(New_Id
) = E_Operator
3548 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
3554 -- If both are functions/operators, check return types conform
3556 if Old_Type
/= Standard_Void_Type
3557 and then New_Type
/= Standard_Void_Type
3560 -- If we are checking interface conformance we omit controlling
3561 -- arguments and result, because we are only checking the conformance
3562 -- of the remaining parameters.
3564 if Has_Controlling_Result
(Old_Id
)
3565 and then Has_Controlling_Result
(New_Id
)
3566 and then Skip_Controlling_Formals
3570 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
3571 Conformance_Error
("\return type does not match!", New_Id
);
3575 -- Ada 2005 (AI-231): In case of anonymous access types check the
3576 -- null-exclusion and access-to-constant attributes match.
3578 if Ada_Version
>= Ada_05
3579 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
3581 (Can_Never_Be_Null
(Old_Type
)
3582 /= Can_Never_Be_Null
(New_Type
)
3583 or else Is_Access_Constant
(Etype
(Old_Type
))
3584 /= Is_Access_Constant
(Etype
(New_Type
)))
3586 Conformance_Error
("\return type does not match!", New_Id
);
3590 -- If either is a function/operator and the other isn't, error
3592 elsif Old_Type
/= Standard_Void_Type
3593 or else New_Type
/= Standard_Void_Type
3595 Conformance_Error
("\functions can only match functions!", New_Id
);
3599 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3600 -- If this is a renaming as body, refine error message to indicate that
3601 -- the conflict is with the original declaration. If the entity is not
3602 -- frozen, the conventions don't have to match, the one of the renamed
3603 -- entity is inherited.
3605 if Ctype
>= Subtype_Conformant
then
3606 if Convention
(Old_Id
) /= Convention
(New_Id
) then
3608 if not Is_Frozen
(New_Id
) then
3611 elsif Present
(Err_Loc
)
3612 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
3613 and then Present
(Corresponding_Spec
(Err_Loc
))
3615 Error_Msg_Name_1
:= Chars
(New_Id
);
3617 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
3619 Conformance_Error
("\prior declaration for% has convention %!");
3622 Conformance_Error
("\calling conventions do not match!");
3627 elsif Is_Formal_Subprogram
(Old_Id
)
3628 or else Is_Formal_Subprogram
(New_Id
)
3630 Conformance_Error
("\formal subprograms not allowed!");
3635 -- Deal with parameters
3637 -- Note: we use the entity information, rather than going directly
3638 -- to the specification in the tree. This is not only simpler, but
3639 -- absolutely necessary for some cases of conformance tests between
3640 -- operators, where the declaration tree simply does not exist!
3642 Old_Formal
:= First_Formal
(Old_Id
);
3643 New_Formal
:= First_Formal
(New_Id
);
3644 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
3645 if Is_Controlling_Formal
(Old_Formal
)
3646 and then Is_Controlling_Formal
(New_Formal
)
3647 and then Skip_Controlling_Formals
3649 -- The controlling formals will have different types when
3650 -- comparing an interface operation with its match, but both
3651 -- or neither must be access parameters.
3653 if Is_Access_Type
(Etype
(Old_Formal
))
3655 Is_Access_Type
(Etype
(New_Formal
))
3657 goto Skip_Controlling_Formal
;
3660 ("\access parameter does not match!", New_Formal
);
3664 if Ctype
= Fully_Conformant
then
3666 -- Names must match. Error message is more accurate if we do
3667 -- this before checking that the types of the formals match.
3669 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
3670 Conformance_Error
("\name & does not match!", New_Formal
);
3672 -- Set error posted flag on new formal as well to stop
3673 -- junk cascaded messages in some cases.
3675 Set_Error_Posted
(New_Formal
);
3680 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3681 -- case occurs whenever a subprogram is being renamed and one of its
3682 -- parameters imposes a null exclusion. For example:
3684 -- type T is null record;
3685 -- type Acc_T is access T;
3686 -- subtype Acc_T_Sub is Acc_T;
3688 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3689 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3692 Old_Formal_Base
:= Etype
(Old_Formal
);
3693 New_Formal_Base
:= Etype
(New_Formal
);
3696 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
3697 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
3700 Access_Types_Match
:= Ada_Version
>= Ada_05
3702 -- Ensure that this rule is only applied when New_Id is a
3703 -- renaming of Old_Id.
3705 and then Nkind
(Parent
(Parent
(New_Id
))) =
3706 N_Subprogram_Renaming_Declaration
3707 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
3708 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
3709 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
3711 -- Now handle the allowed access-type case
3713 and then Is_Access_Type
(Old_Formal_Base
)
3714 and then Is_Access_Type
(New_Formal_Base
)
3716 -- The type kinds must match. The only exception occurs with
3717 -- multiple generics of the form:
3720 -- type F is private; type A is private;
3721 -- type F_Ptr is access F; type A_Ptr is access A;
3722 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3723 -- package F_Pack is ... package A_Pack is
3724 -- package F_Inst is
3725 -- new F_Pack (A, A_Ptr, A_P);
3727 -- When checking for conformance between the parameters of A_P
3728 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3729 -- because the compiler has transformed A_Ptr into a subtype of
3730 -- F_Ptr. We catch this case in the code below.
3732 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
3734 (Is_Generic_Type
(Old_Formal_Base
)
3735 and then Is_Generic_Type
(New_Formal_Base
)
3736 and then Is_Internal
(New_Formal_Base
)
3737 and then Etype
(Etype
(New_Formal_Base
)) =
3739 and then Directly_Designated_Type
(Old_Formal_Base
) =
3740 Directly_Designated_Type
(New_Formal_Base
)
3741 and then ((Is_Itype
(Old_Formal_Base
)
3742 and then Can_Never_Be_Null
(Old_Formal_Base
))
3744 (Is_Itype
(New_Formal_Base
)
3745 and then Can_Never_Be_Null
(New_Formal_Base
)));
3747 -- Types must always match. In the visible part of an instance,
3748 -- usual overloading rules for dispatching operations apply, and
3749 -- we check base types (not the actual subtypes).
3751 if In_Instance_Visible_Part
3752 and then Is_Dispatching_Operation
(New_Id
)
3754 if not Conforming_Types
3755 (T1
=> Base_Type
(Etype
(Old_Formal
)),
3756 T2
=> Base_Type
(Etype
(New_Formal
)),
3758 Get_Inst
=> Get_Inst
)
3759 and then not Access_Types_Match
3761 Conformance_Error
("\type of & does not match!", New_Formal
);
3765 elsif not Conforming_Types
3766 (T1
=> Old_Formal_Base
,
3767 T2
=> New_Formal_Base
,
3769 Get_Inst
=> Get_Inst
)
3770 and then not Access_Types_Match
3772 -- Don't give error message if old type is Any_Type. This test
3773 -- avoids some cascaded errors, e.g. in case of a bad spec.
3775 if Errmsg
and then Old_Formal_Base
= Any_Type
then
3778 Conformance_Error
("\type of & does not match!", New_Formal
);
3784 -- For mode conformance, mode must match
3786 if Ctype
>= Mode_Conformant
then
3787 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
3788 Conformance_Error
("\mode of & does not match!", New_Formal
);
3791 -- Part of mode conformance for access types is having the same
3792 -- constant modifier.
3794 elsif Access_Types_Match
3795 and then Is_Access_Constant
(Old_Formal_Base
) /=
3796 Is_Access_Constant
(New_Formal_Base
)
3799 ("\constant modifier does not match!", New_Formal
);
3804 if Ctype
>= Subtype_Conformant
then
3806 -- Ada 2005 (AI-231): In case of anonymous access types check
3807 -- the null-exclusion and access-to-constant attributes must
3810 if Ada_Version
>= Ada_05
3811 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
3812 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
3814 (Can_Never_Be_Null
(Old_Formal
) /=
3815 Can_Never_Be_Null
(New_Formal
)
3817 Is_Access_Constant
(Etype
(Old_Formal
)) /=
3818 Is_Access_Constant
(Etype
(New_Formal
)))
3820 -- It is allowed to omit the null-exclusion in case of stream
3821 -- attribute subprograms. We recognize stream subprograms
3822 -- through their TSS-generated suffix.
3825 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
3827 if TSS_Name
/= TSS_Stream_Read
3828 and then TSS_Name
/= TSS_Stream_Write
3829 and then TSS_Name
/= TSS_Stream_Input
3830 and then TSS_Name
/= TSS_Stream_Output
3833 ("\type of & does not match!", New_Formal
);
3840 -- Full conformance checks
3842 if Ctype
= Fully_Conformant
then
3844 -- We have checked already that names match
3846 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
3848 -- Check default expressions for in parameters
3851 NewD
: constant Boolean :=
3852 Present
(Default_Value
(New_Formal
));
3853 OldD
: constant Boolean :=
3854 Present
(Default_Value
(Old_Formal
));
3856 if NewD
or OldD
then
3858 -- The old default value has been analyzed because the
3859 -- current full declaration will have frozen everything
3860 -- before. The new default value has not been analyzed,
3861 -- so analyze it now before we check for conformance.
3864 Push_Scope
(New_Id
);
3865 Preanalyze_Spec_Expression
3866 (Default_Value
(New_Formal
), Etype
(New_Formal
));
3870 if not (NewD
and OldD
)
3871 or else not Fully_Conformant_Expressions
3872 (Default_Value
(Old_Formal
),
3873 Default_Value
(New_Formal
))
3876 ("\default expression for & does not match!",
3885 -- A couple of special checks for Ada 83 mode. These checks are
3886 -- skipped if either entity is an operator in package Standard,
3887 -- or if either old or new instance is not from the source program.
3889 if Ada_Version
= Ada_83
3890 and then Sloc
(Old_Id
) > Standard_Location
3891 and then Sloc
(New_Id
) > Standard_Location
3892 and then Comes_From_Source
(Old_Id
)
3893 and then Comes_From_Source
(New_Id
)
3896 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
3897 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
3900 -- Explicit IN must be present or absent in both cases. This
3901 -- test is required only in the full conformance case.
3903 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
3904 and then Ctype
= Fully_Conformant
3907 ("\(Ada 83) IN must appear in both declarations",
3912 -- Grouping (use of comma in param lists) must be the same
3913 -- This is where we catch a misconformance like:
3916 -- A : Integer; B : Integer
3918 -- which are represented identically in the tree except
3919 -- for the setting of the flags More_Ids and Prev_Ids.
3921 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
3922 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
3925 ("\grouping of & does not match!", New_Formal
);
3931 -- This label is required when skipping controlling formals
3933 <<Skip_Controlling_Formal
>>
3935 Next_Formal
(Old_Formal
);
3936 Next_Formal
(New_Formal
);
3939 if Present
(Old_Formal
) then
3940 Conformance_Error
("\too few parameters!");
3943 elsif Present
(New_Formal
) then
3944 Conformance_Error
("\too many parameters!", New_Formal
);
3947 end Check_Conformance
;
3949 -----------------------
3950 -- Check_Conventions --
3951 -----------------------
3953 procedure Check_Conventions
(Typ
: Entity_Id
) is
3954 Ifaces_List
: Elist_Id
;
3956 procedure Check_Convention
(Op
: Entity_Id
);
3957 -- Verify that the convention of inherited dispatching operation Op is
3958 -- consistent among all subprograms it overrides. In order to minimize
3959 -- the search, Search_From is utilized to designate a specific point in
3960 -- the list rather than iterating over the whole list once more.
3962 ----------------------
3963 -- Check_Convention --
3964 ----------------------
3966 procedure Check_Convention
(Op
: Entity_Id
) is
3967 Iface_Elmt
: Elmt_Id
;
3968 Iface_Prim_Elmt
: Elmt_Id
;
3969 Iface_Prim
: Entity_Id
;
3972 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
3973 while Present
(Iface_Elmt
) loop
3975 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
3976 while Present
(Iface_Prim_Elmt
) loop
3977 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
3979 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
3980 and then Convention
(Iface_Prim
) /= Convention
(Op
)
3983 ("inconsistent conventions in primitive operations", Typ
);
3985 Error_Msg_Name_1
:= Chars
(Op
);
3986 Error_Msg_Name_2
:= Get_Convention_Name
(Convention
(Op
));
3987 Error_Msg_Sloc
:= Sloc
(Op
);
3989 if Comes_From_Source
(Op
) then
3990 if not Is_Overriding_Operation
(Op
) then
3991 Error_Msg_N
("\\primitive % defined #", Typ
);
3993 Error_Msg_N
("\\overriding operation % with " &
3994 "convention % defined #", Typ
);
3997 else pragma Assert
(Present
(Alias
(Op
)));
3998 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
3999 Error_Msg_N
("\\inherited operation % with " &
4000 "convention % defined #", Typ
);
4003 Error_Msg_Name_1
:= Chars
(Op
);
4005 Get_Convention_Name
(Convention
(Iface_Prim
));
4006 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
4007 Error_Msg_N
("\\overridden operation % with " &
4008 "convention % defined #", Typ
);
4010 -- Avoid cascading errors
4015 Next_Elmt
(Iface_Prim_Elmt
);
4018 Next_Elmt
(Iface_Elmt
);
4020 end Check_Convention
;
4024 Prim_Op
: Entity_Id
;
4025 Prim_Op_Elmt
: Elmt_Id
;
4027 -- Start of processing for Check_Conventions
4030 if not Has_Interfaces
(Typ
) then
4034 Collect_Interfaces
(Typ
, Ifaces_List
);
4036 -- The algorithm checks every overriding dispatching operation against
4037 -- all the corresponding overridden dispatching operations, detecting
4038 -- differences in conventions.
4040 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
4041 while Present
(Prim_Op_Elmt
) loop
4042 Prim_Op
:= Node
(Prim_Op_Elmt
);
4044 -- A small optimization: skip the predefined dispatching operations
4045 -- since they always have the same convention.
4047 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
4048 Check_Convention
(Prim_Op
);
4051 Next_Elmt
(Prim_Op_Elmt
);
4053 end Check_Conventions
;
4055 ------------------------------
4056 -- Check_Delayed_Subprogram --
4057 ------------------------------
4059 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
4062 procedure Possible_Freeze
(T
: Entity_Id
);
4063 -- T is the type of either a formal parameter or of the return type.
4064 -- If T is not yet frozen and needs a delayed freeze, then the
4065 -- subprogram itself must be delayed. If T is the limited view of an
4066 -- incomplete type the subprogram must be frozen as well, because
4067 -- T may depend on local types that have not been frozen yet.
4069 ---------------------
4070 -- Possible_Freeze --
4071 ---------------------
4073 procedure Possible_Freeze
(T
: Entity_Id
) is
4075 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
4076 Set_Has_Delayed_Freeze
(Designator
);
4078 elsif Is_Access_Type
(T
)
4079 and then Has_Delayed_Freeze
(Designated_Type
(T
))
4080 and then not Is_Frozen
(Designated_Type
(T
))
4082 Set_Has_Delayed_Freeze
(Designator
);
4084 elsif Ekind
(T
) = E_Incomplete_Type
and then From_With_Type
(T
) then
4085 Set_Has_Delayed_Freeze
(Designator
);
4088 end Possible_Freeze
;
4090 -- Start of processing for Check_Delayed_Subprogram
4093 -- Never need to freeze abstract subprogram
4095 if Ekind
(Designator
) /= E_Subprogram_Type
4096 and then Is_Abstract_Subprogram
(Designator
)
4100 -- Need delayed freeze if return type itself needs a delayed
4101 -- freeze and is not yet frozen.
4103 Possible_Freeze
(Etype
(Designator
));
4104 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
4106 -- Need delayed freeze if any of the formal types themselves need
4107 -- a delayed freeze and are not yet frozen.
4109 F
:= First_Formal
(Designator
);
4110 while Present
(F
) loop
4111 Possible_Freeze
(Etype
(F
));
4112 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
4117 -- Mark functions that return by reference. Note that it cannot be
4118 -- done for delayed_freeze subprograms because the underlying
4119 -- returned type may not be known yet (for private types)
4121 if not Has_Delayed_Freeze
(Designator
)
4122 and then Expander_Active
4125 Typ
: constant Entity_Id
:= Etype
(Designator
);
4126 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
4129 if Is_Inherently_Limited_Type
(Typ
) then
4130 Set_Returns_By_Ref
(Designator
);
4132 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
4133 Set_Returns_By_Ref
(Designator
);
4137 end Check_Delayed_Subprogram
;
4139 ------------------------------------
4140 -- Check_Discriminant_Conformance --
4141 ------------------------------------
4143 procedure Check_Discriminant_Conformance
4148 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
4149 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
4150 New_Discr_Id
: Entity_Id
;
4151 New_Discr_Type
: Entity_Id
;
4153 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
4154 -- Post error message for conformance error on given node. Two messages
4155 -- are output. The first points to the previous declaration with a
4156 -- general "no conformance" message. The second is the detailed reason,
4157 -- supplied as Msg. The parameter N provide information for a possible
4158 -- & insertion in the message.
4160 -----------------------
4161 -- Conformance_Error --
4162 -----------------------
4164 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
4166 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
4167 Error_Msg_N
-- CODEFIX
4168 ("not fully conformant with declaration#!", N
);
4169 Error_Msg_NE
(Msg
, N
, N
);
4170 end Conformance_Error
;
4172 -- Start of processing for Check_Discriminant_Conformance
4175 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
4177 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
4179 -- The subtype mark of the discriminant on the full type has not
4180 -- been analyzed so we do it here. For an access discriminant a new
4183 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
4185 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
4188 Analyze
(Discriminant_Type
(New_Discr
));
4189 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
4191 -- Ada 2005: if the discriminant definition carries a null
4192 -- exclusion, create an itype to check properly for consistency
4193 -- with partial declaration.
4195 if Is_Access_Type
(New_Discr_Type
)
4196 and then Null_Exclusion_Present
(New_Discr
)
4199 Create_Null_Excluding_Itype
4200 (T
=> New_Discr_Type
,
4201 Related_Nod
=> New_Discr
,
4202 Scope_Id
=> Current_Scope
);
4206 if not Conforming_Types
4207 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
4209 Conformance_Error
("type of & does not match!", New_Discr_Id
);
4212 -- Treat the new discriminant as an occurrence of the old one,
4213 -- for navigation purposes, and fill in some semantic
4214 -- information, for completeness.
4216 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
4217 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
4218 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
4223 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
4224 Conformance_Error
("name & does not match!", New_Discr_Id
);
4228 -- Default expressions must match
4231 NewD
: constant Boolean :=
4232 Present
(Expression
(New_Discr
));
4233 OldD
: constant Boolean :=
4234 Present
(Expression
(Parent
(Old_Discr
)));
4237 if NewD
or OldD
then
4239 -- The old default value has been analyzed and expanded,
4240 -- because the current full declaration will have frozen
4241 -- everything before. The new default values have not been
4242 -- expanded, so expand now to check conformance.
4245 Preanalyze_Spec_Expression
4246 (Expression
(New_Discr
), New_Discr_Type
);
4249 if not (NewD
and OldD
)
4250 or else not Fully_Conformant_Expressions
4251 (Expression
(Parent
(Old_Discr
)),
4252 Expression
(New_Discr
))
4256 ("default expression for & does not match!",
4263 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4265 if Ada_Version
= Ada_83
then
4267 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
4270 -- Grouping (use of comma in param lists) must be the same
4271 -- This is where we catch a misconformance like:
4274 -- A : Integer; B : Integer
4276 -- which are represented identically in the tree except
4277 -- for the setting of the flags More_Ids and Prev_Ids.
4279 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
4280 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
4283 ("grouping of & does not match!", New_Discr_Id
);
4289 Next_Discriminant
(Old_Discr
);
4293 if Present
(Old_Discr
) then
4294 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
4297 elsif Present
(New_Discr
) then
4299 ("too many discriminants!", Defining_Identifier
(New_Discr
));
4302 end Check_Discriminant_Conformance
;
4304 ----------------------------
4305 -- Check_Fully_Conformant --
4306 ----------------------------
4308 procedure Check_Fully_Conformant
4309 (New_Id
: Entity_Id
;
4311 Err_Loc
: Node_Id
:= Empty
)
4314 pragma Warnings
(Off
, Result
);
4317 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
4318 end Check_Fully_Conformant
;
4320 ---------------------------
4321 -- Check_Mode_Conformant --
4322 ---------------------------
4324 procedure Check_Mode_Conformant
4325 (New_Id
: Entity_Id
;
4327 Err_Loc
: Node_Id
:= Empty
;
4328 Get_Inst
: Boolean := False)
4331 pragma Warnings
(Off
, Result
);
4334 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
4335 end Check_Mode_Conformant
;
4337 --------------------------------
4338 -- Check_Overriding_Indicator --
4339 --------------------------------
4341 procedure Check_Overriding_Indicator
4343 Overridden_Subp
: Entity_Id
;
4344 Is_Primitive
: Boolean)
4350 -- No overriding indicator for literals
4352 if Ekind
(Subp
) = E_Enumeration_Literal
then
4355 elsif Ekind
(Subp
) = E_Entry
then
4356 Decl
:= Parent
(Subp
);
4359 Decl
:= Unit_Declaration_Node
(Subp
);
4362 if Nkind_In
(Decl
, N_Subprogram_Body
,
4363 N_Subprogram_Body_Stub
,
4364 N_Subprogram_Declaration
,
4365 N_Abstract_Subprogram_Declaration
,
4366 N_Subprogram_Renaming_Declaration
)
4368 Spec
:= Specification
(Decl
);
4370 elsif Nkind
(Decl
) = N_Entry_Declaration
then
4377 -- The overriding operation is type conformant with the overridden one,
4378 -- but the names of the formals are not required to match. If the names
4379 -- appear permuted in the overriding operation, this is a possible
4380 -- source of confusion that is worth diagnosing. Controlling formals
4381 -- often carry names that reflect the type, and it is not worthwhile
4382 -- requiring that their names match.
4384 if Present
(Overridden_Subp
)
4385 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
4392 Form1
:= First_Formal
(Subp
);
4393 Form2
:= First_Formal
(Overridden_Subp
);
4395 -- If the overriding operation is a synchronized operation, skip
4396 -- the first parameter of the overridden operation, which is
4397 -- implicit in the new one. If the operation is declared in the
4398 -- body it is not primitive and all formals must match.
4400 if Is_Concurrent_Type
(Scope
(Subp
))
4401 and then Is_Tagged_Type
(Scope
(Subp
))
4402 and then not Has_Completion
(Scope
(Subp
))
4404 Form2
:= Next_Formal
(Form2
);
4407 if Present
(Form1
) then
4408 Form1
:= Next_Formal
(Form1
);
4409 Form2
:= Next_Formal
(Form2
);
4412 while Present
(Form1
) loop
4413 if not Is_Controlling_Formal
(Form1
)
4414 and then Present
(Next_Formal
(Form2
))
4415 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
4417 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
4418 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
4419 Error_Msg_NE
("& does not match corresponding formal of&#",
4424 Next_Formal
(Form1
);
4425 Next_Formal
(Form2
);
4430 if Present
(Overridden_Subp
) then
4431 if Must_Not_Override
(Spec
) then
4432 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
4434 if Ekind
(Subp
) = E_Entry
then
4436 ("entry & overrides inherited operation #", Spec
, Subp
);
4439 ("subprogram & overrides inherited operation #", Spec
, Subp
);
4442 elsif Is_Subprogram
(Subp
) then
4443 Set_Is_Overriding_Operation
(Subp
);
4446 -- If primitive flag is set or this is a protected operation, then
4447 -- the operation is overriding at the point of its declaration, so
4448 -- warn if necessary. Otherwise it may have been declared before the
4449 -- operation it overrides and no check is required.
4452 and then not Must_Override
(Spec
)
4453 and then (Is_Primitive
4454 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
4456 Style
.Missing_Overriding
(Decl
, Subp
);
4459 -- If Subp is an operator, it may override a predefined operation.
4460 -- In that case overridden_subp is empty because of our implicit
4461 -- representation for predefined operators. We have to check whether the
4462 -- signature of Subp matches that of a predefined operator. Note that
4463 -- first argument provides the name of the operator, and the second
4464 -- argument the signature that may match that of a standard operation.
4465 -- If the indicator is overriding, then the operator must match a
4466 -- predefined signature, because we know already that there is no
4467 -- explicit overridden operation.
4469 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
4471 if Must_Not_Override
(Spec
) then
4473 -- If this is not a primitive operation or protected subprogram,
4474 -- then "not overriding" is illegal.
4477 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4480 ("overriding indicator only allowed "
4481 & "if subprogram is primitive", Subp
);
4483 elsif Operator_Matches_Spec
(Subp
, Subp
) then
4485 ("subprogram & overrides predefined operator ", Spec
, Subp
);
4488 elsif Must_Override
(Spec
) then
4489 if Is_Overriding_Operation
(Subp
) then
4490 Set_Is_Overriding_Operation
(Subp
);
4492 elsif not Operator_Matches_Spec
(Subp
, Subp
) then
4493 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4496 elsif not Error_Posted
(Subp
)
4497 and then Style_Check
4498 and then Operator_Matches_Spec
(Subp
, Subp
)
4500 not Is_Predefined_File_Name
4501 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
4503 Set_Is_Overriding_Operation
(Subp
);
4505 -- If style checks are enabled, indicate that the indicator is
4506 -- missing. However, at the point of declaration, the type of
4507 -- which this is a primitive operation may be private, in which
4508 -- case the indicator would be premature.
4510 if Has_Private_Declaration
(Etype
(Subp
))
4511 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
4515 Style
.Missing_Overriding
(Decl
, Subp
);
4519 elsif Must_Override
(Spec
) then
4520 if Ekind
(Subp
) = E_Entry
then
4521 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
4523 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4526 -- If the operation is marked "not overriding" and it's not primitive
4527 -- then an error is issued, unless this is an operation of a task or
4528 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4529 -- has been specified have already been checked above.
4531 elsif Must_Not_Override
(Spec
)
4532 and then not Is_Primitive
4533 and then Ekind
(Subp
) /= E_Entry
4534 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4537 ("overriding indicator only allowed if subprogram is primitive",
4541 end Check_Overriding_Indicator
;
4547 -- Note: this procedure needs to know far too much about how the expander
4548 -- messes with exceptions. The use of the flag Exception_Junk and the
4549 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4550 -- works, but is not very clean. It would be better if the expansion
4551 -- routines would leave Original_Node working nicely, and we could use
4552 -- Original_Node here to ignore all the peculiar expander messing ???
4554 procedure Check_Returns
4558 Proc
: Entity_Id
:= Empty
)
4562 procedure Check_Statement_Sequence
(L
: List_Id
);
4563 -- Internal recursive procedure to check a list of statements for proper
4564 -- termination by a return statement (or a transfer of control or a
4565 -- compound statement that is itself internally properly terminated).
4567 ------------------------------
4568 -- Check_Statement_Sequence --
4569 ------------------------------
4571 procedure Check_Statement_Sequence
(L
: List_Id
) is
4576 Raise_Exception_Call
: Boolean;
4577 -- Set True if statement sequence terminated by Raise_Exception call
4578 -- or a Reraise_Occurrence call.
4581 Raise_Exception_Call
:= False;
4583 -- Get last real statement
4585 Last_Stm
:= Last
(L
);
4587 -- Deal with digging out exception handler statement sequences that
4588 -- have been transformed by the local raise to goto optimization.
4589 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4590 -- optimization has occurred, we are looking at something like:
4593 -- original stmts in block
4597 -- goto L1; | omitted if No_Exception_Propagation
4602 -- goto L3; -- skip handler when exception not raised
4604 -- <<L1>> -- target label for local exception
4618 -- and what we have to do is to dig out the estmts1 and estmts2
4619 -- sequences (which were the original sequences of statements in
4620 -- the exception handlers) and check them.
4622 if Nkind
(Last_Stm
) = N_Label
4623 and then Exception_Junk
(Last_Stm
)
4629 exit when Nkind
(Stm
) /= N_Block_Statement
;
4630 exit when not Exception_Junk
(Stm
);
4633 exit when Nkind
(Stm
) /= N_Label
;
4634 exit when not Exception_Junk
(Stm
);
4635 Check_Statement_Sequence
4636 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
4641 exit when Nkind
(Stm
) /= N_Goto_Statement
;
4642 exit when not Exception_Junk
(Stm
);
4646 -- Don't count pragmas
4648 while Nkind
(Last_Stm
) = N_Pragma
4650 -- Don't count call to SS_Release (can happen after Raise_Exception)
4653 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
4655 Nkind
(Name
(Last_Stm
)) = N_Identifier
4657 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
4659 -- Don't count exception junk
4662 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
4664 N_Object_Declaration
)
4665 and then Exception_Junk
(Last_Stm
))
4666 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
4667 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
4672 -- Here we have the "real" last statement
4674 Kind
:= Nkind
(Last_Stm
);
4676 -- Transfer of control, OK. Note that in the No_Return procedure
4677 -- case, we already diagnosed any explicit return statements, so
4678 -- we can treat them as OK in this context.
4680 if Is_Transfer
(Last_Stm
) then
4683 -- Check cases of explicit non-indirect procedure calls
4685 elsif Kind
= N_Procedure_Call_Statement
4686 and then Is_Entity_Name
(Name
(Last_Stm
))
4688 -- Check call to Raise_Exception procedure which is treated
4689 -- specially, as is a call to Reraise_Occurrence.
4691 -- We suppress the warning in these cases since it is likely that
4692 -- the programmer really does not expect to deal with the case
4693 -- of Null_Occurrence, and thus would find a warning about a
4694 -- missing return curious, and raising Program_Error does not
4695 -- seem such a bad behavior if this does occur.
4697 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4698 -- behavior will be to raise Constraint_Error (see AI-329).
4700 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
4702 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
4704 Raise_Exception_Call
:= True;
4706 -- For Raise_Exception call, test first argument, if it is
4707 -- an attribute reference for a 'Identity call, then we know
4708 -- that the call cannot possibly return.
4711 Arg
: constant Node_Id
:=
4712 Original_Node
(First_Actual
(Last_Stm
));
4714 if Nkind
(Arg
) = N_Attribute_Reference
4715 and then Attribute_Name
(Arg
) = Name_Identity
4722 -- If statement, need to look inside if there is an else and check
4723 -- each constituent statement sequence for proper termination.
4725 elsif Kind
= N_If_Statement
4726 and then Present
(Else_Statements
(Last_Stm
))
4728 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
4729 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4731 if Present
(Elsif_Parts
(Last_Stm
)) then
4733 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
4736 while Present
(Elsif_Part
) loop
4737 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
4745 -- Case statement, check each case for proper termination
4747 elsif Kind
= N_Case_Statement
then
4751 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
4752 while Present
(Case_Alt
) loop
4753 Check_Statement_Sequence
(Statements
(Case_Alt
));
4754 Next_Non_Pragma
(Case_Alt
);
4760 -- Block statement, check its handled sequence of statements
4762 elsif Kind
= N_Block_Statement
then
4768 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
4777 -- Loop statement. If there is an iteration scheme, we can definitely
4778 -- fall out of the loop. Similarly if there is an exit statement, we
4779 -- can fall out. In either case we need a following return.
4781 elsif Kind
= N_Loop_Statement
then
4782 if Present
(Iteration_Scheme
(Last_Stm
))
4783 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
4787 -- A loop with no exit statement or iteration scheme is either
4788 -- an infinite loop, or it has some other exit (raise/return).
4789 -- In either case, no warning is required.
4795 -- Timed entry call, check entry call and delay alternatives
4797 -- Note: in expanded code, the timed entry call has been converted
4798 -- to a set of expanded statements on which the check will work
4799 -- correctly in any case.
4801 elsif Kind
= N_Timed_Entry_Call
then
4803 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4804 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
4807 -- If statement sequence of entry call alternative is missing,
4808 -- then we can definitely fall through, and we post the error
4809 -- message on the entry call alternative itself.
4811 if No
(Statements
(ECA
)) then
4814 -- If statement sequence of delay alternative is missing, then
4815 -- we can definitely fall through, and we post the error
4816 -- message on the delay alternative itself.
4818 -- Note: if both ECA and DCA are missing the return, then we
4819 -- post only one message, should be enough to fix the bugs.
4820 -- If not we will get a message next time on the DCA when the
4823 elsif No
(Statements
(DCA
)) then
4826 -- Else check both statement sequences
4829 Check_Statement_Sequence
(Statements
(ECA
));
4830 Check_Statement_Sequence
(Statements
(DCA
));
4835 -- Conditional entry call, check entry call and else part
4837 -- Note: in expanded code, the conditional entry call has been
4838 -- converted to a set of expanded statements on which the check
4839 -- will work correctly in any case.
4841 elsif Kind
= N_Conditional_Entry_Call
then
4843 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
4846 -- If statement sequence of entry call alternative is missing,
4847 -- then we can definitely fall through, and we post the error
4848 -- message on the entry call alternative itself.
4850 if No
(Statements
(ECA
)) then
4853 -- Else check statement sequence and else part
4856 Check_Statement_Sequence
(Statements
(ECA
));
4857 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4863 -- If we fall through, issue appropriate message
4866 if not Raise_Exception_Call
then
4868 ("?RETURN statement missing following this statement!",
4871 ("\?Program_Error may be raised at run time!",
4875 -- Note: we set Err even though we have not issued a warning
4876 -- because we still have a case of a missing return. This is
4877 -- an extremely marginal case, probably will never be noticed
4878 -- but we might as well get it right.
4882 -- Otherwise we have the case of a procedure marked No_Return
4885 if not Raise_Exception_Call
then
4887 ("?implied return after this statement " &
4888 "will raise Program_Error",
4891 ("\?procedure & is marked as No_Return!",
4896 RE
: constant Node_Id
:=
4897 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
4898 Reason
=> PE_Implicit_Return
);
4900 Insert_After
(Last_Stm
, RE
);
4904 end Check_Statement_Sequence
;
4906 -- Start of processing for Check_Returns
4910 Check_Statement_Sequence
(Statements
(HSS
));
4912 if Present
(Exception_Handlers
(HSS
)) then
4913 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
4914 while Present
(Handler
) loop
4915 Check_Statement_Sequence
(Statements
(Handler
));
4916 Next_Non_Pragma
(Handler
);
4921 ----------------------------
4922 -- Check_Subprogram_Order --
4923 ----------------------------
4925 procedure Check_Subprogram_Order
(N
: Node_Id
) is
4927 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
4928 -- This is used to check if S1 > S2 in the sense required by this
4929 -- test, for example nameab < namec, but name2 < name10.
4931 -----------------------------
4932 -- Subprogram_Name_Greater --
4933 -----------------------------
4935 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
4940 -- Remove trailing numeric parts
4943 while S1
(L1
) in '0' .. '9' loop
4948 while S2
(L2
) in '0' .. '9' loop
4952 -- If non-numeric parts non-equal, that's decisive
4954 if S1
(S1
'First .. L1
) < S2
(S2
'First .. L2
) then
4957 elsif S1
(S1
'First .. L1
) > S2
(S2
'First .. L2
) then
4960 -- If non-numeric parts equal, compare suffixed numeric parts. Note
4961 -- that a missing suffix is treated as numeric zero in this test.
4965 while L1
< S1
'Last loop
4967 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
4971 while L2
< S2
'Last loop
4973 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
4978 end Subprogram_Name_Greater
;
4980 -- Start of processing for Check_Subprogram_Order
4983 -- Check body in alpha order if this is option
4986 and then Style_Check_Order_Subprograms
4987 and then Nkind
(N
) = N_Subprogram_Body
4988 and then Comes_From_Source
(N
)
4989 and then In_Extended_Main_Source_Unit
(N
)
4993 renames Scope_Stack
.Table
4994 (Scope_Stack
.Last
).Last_Subprogram_Name
;
4996 Body_Id
: constant Entity_Id
:=
4997 Defining_Entity
(Specification
(N
));
5000 Get_Decoded_Name_String
(Chars
(Body_Id
));
5003 if Subprogram_Name_Greater
5004 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
5006 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
5012 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
5015 end Check_Subprogram_Order;
5017 ------------------------------
5018 -- Check_Subtype_Conformant --
5019 ------------------------------
5021 procedure Check_Subtype_Conformant
5022 (New_Id : Entity_Id;
5024 Err_Loc : Node_Id := Empty;
5025 Skip_Controlling_Formals : Boolean := False)
5028 pragma Warnings (Off, Result);
5031 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
5032 Skip_Controlling_Formals => Skip_Controlling_Formals);
5033 end Check_Subtype_Conformant;
5035 ---------------------------
5036 -- Check_Type_Conformant --
5037 ---------------------------
5039 procedure Check_Type_Conformant
5040 (New_Id : Entity_Id;
5042 Err_Loc : Node_Id := Empty)
5045 pragma Warnings (Off, Result);
5048 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
5049 end Check_Type_Conformant;
5051 ----------------------
5052 -- Conforming_Types --
5053 ----------------------
5055 function Conforming_Types
5058 Ctype : Conformance_Type;
5059 Get_Inst : Boolean := False) return Boolean
5061 Type_1 : Entity_Id := T1;
5062 Type_2 : Entity_Id := T2;
5063 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
5065 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
5066 -- If neither T1 nor T2 are generic actual types, or if they are in
5067 -- different scopes (e.g. parent and child instances), then verify that
5068 -- the base types are equal. Otherwise T1 and T2 must be on the same
5069 -- subtype chain. The whole purpose of this procedure is to prevent
5070 -- spurious ambiguities in an instantiation that may arise if two
5071 -- distinct generic types are instantiated with the same actual.
5073 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
5074 -- An access parameter can designate an incomplete type. If the
5075 -- incomplete type is the limited view of a type from a limited_
5076 -- with_clause, check whether the non-limited view is available. If
5077 -- it is a (non-limited) incomplete type, get the full view.
5079 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
5080 -- Returns True if and only if either T1 denotes a limited view of T2
5081 -- or T2 denotes a limited view of T1. This can arise when the limited
5082 -- with view of a type is used in a subprogram declaration and the
5083 -- subprogram body is in the scope of a regular with clause for the
5084 -- same unit. In such a case, the two type entities can be considered
5085 -- identical for purposes of conformance checking.
5087 ----------------------
5088 -- Base_Types_Match --
5089 ----------------------
5091 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
5096 elsif Base_Type (T1) = Base_Type (T2) then
5098 -- The following is too permissive. A more precise test should
5099 -- check that the generic actual is an ancestor subtype of the
5102 return not Is_Generic_Actual_Type (T1)
5103 or else not Is_Generic_Actual_Type (T2)
5104 or else Scope (T1) /= Scope (T2);
5109 end Base_Types_Match;
5111 --------------------------
5112 -- Find_Designated_Type --
5113 --------------------------
5115 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
5119 Desig := Directly_Designated_Type (T);
5121 if Ekind (Desig) = E_Incomplete_Type then
5123 -- If regular incomplete type, get full view if available
5125 if Present (Full_View (Desig)) then
5126 Desig := Full_View (Desig);
5128 -- If limited view of a type, get non-limited view if available,
5129 -- and check again for a regular incomplete type.
5131 elsif Present (Non_Limited_View (Desig)) then
5132 Desig := Get_Full_View (Non_Limited_View (Desig));
5137 end Find_Designated_Type;
5139 -------------------------------
5140 -- Matches_Limited_With_View --
5141 -------------------------------
5143 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
5145 -- In some cases a type imported through a limited_with clause, and
5146 -- its nonlimited view are both visible, for example in an anonymous
5147 -- access-to-class-wide type in a formal. Both entities designate the
5150 if From_With_Type (T1)
5151 and then T2 = Available_View (T1)
5155 elsif From_With_Type (T2)
5156 and then T1 = Available_View (T2)
5163 end Matches_Limited_With_View;
5165 -- Start of processing for Conforming_Types
5168 -- The context is an instance association for a formal
5169 -- access-to-subprogram type; the formal parameter types require
5170 -- mapping because they may denote other formal parameters of the
5174 Type_1 := Get_Instance_Of (T1);
5175 Type_2 := Get_Instance_Of (T2);
5178 -- If one of the types is a view of the other introduced by a limited
5179 -- with clause, treat these as conforming for all purposes.
5181 if Matches_Limited_With_View (T1, T2) then
5184 elsif Base_Types_Match (Type_1, Type_2) then
5185 return Ctype <= Mode_Conformant
5186 or else Subtypes_Statically_Match (Type_1, Type_2);
5188 elsif Is_Incomplete_Or_Private_Type (Type_1)
5189 and then Present (Full_View (Type_1))
5190 and then Base_Types_Match (Full_View (Type_1), Type_2)
5192 return Ctype <= Mode_Conformant
5193 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
5195 elsif Ekind (Type_2) = E_Incomplete_Type
5196 and then Present (Full_View (Type_2))
5197 and then Base_Types_Match (Type_1, Full_View (Type_2))
5199 return Ctype <= Mode_Conformant
5200 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5202 elsif Is_Private_Type (Type_2)
5203 and then In_Instance
5204 and then Present (Full_View (Type_2))
5205 and then Base_Types_Match (Type_1, Full_View (Type_2))
5207 return Ctype <= Mode_Conformant
5208 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5211 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
5212 -- treated recursively because they carry a signature.
5214 Are_Anonymous_Access_To_Subprogram_Types :=
5215 Ekind (Type_1) = Ekind (Type_2)
5217 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
5219 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
5221 -- Test anonymous access type case. For this case, static subtype
5222 -- matching is required for mode conformance (RM 6.3.1(15)). We check
5223 -- the base types because we may have built internal subtype entities
5224 -- to handle null-excluding types (see Process_Formals).
5226 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
5228 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
5229 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
5232 Desig_1 : Entity_Id;
5233 Desig_2 : Entity_Id;
5236 -- In Ada2005, access constant indicators must match for
5237 -- subtype conformance.
5239 if Ada_Version >= Ada_05
5240 and then Ctype >= Subtype_Conformant
5242 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
5247 Desig_1 := Find_Designated_Type (Type_1);
5249 Desig_2 := Find_Designated_Type (Type_2);
5251 -- If the context is an instance association for a formal
5252 -- access-to-subprogram type; formal access parameter designated
5253 -- types require mapping because they may denote other formal
5254 -- parameters of the generic unit.
5257 Desig_1 := Get_Instance_Of (Desig_1);
5258 Desig_2 := Get_Instance_Of (Desig_2);
5261 -- It is possible for a Class_Wide_Type to be introduced for an
5262 -- incomplete type, in which case there is a separate class_ wide
5263 -- type for the full view. The types conform if their Etypes
5264 -- conform, i.e. one may be the full view of the other. This can
5265 -- only happen in the context of an access parameter, other uses
5266 -- of an incomplete Class_Wide_Type are illegal.
5268 if Is_Class_Wide_Type (Desig_1)
5269 and then Is_Class_Wide_Type (Desig_2)
5273 (Etype (Base_Type (Desig_1)),
5274 Etype (Base_Type (Desig_2)), Ctype);
5276 elsif Are_Anonymous_Access_To_Subprogram_Types then
5277 if Ada_Version < Ada_05 then
5278 return Ctype = Type_Conformant
5280 Subtypes_Statically_Match (Desig_1, Desig_2);
5282 -- We must check the conformance of the signatures themselves
5286 Conformant : Boolean;
5289 (Desig_1, Desig_2, Ctype, False, Conformant);
5295 return Base_Type (Desig_1) = Base_Type (Desig_2)
5296 and then (Ctype = Type_Conformant
5298 Subtypes_Statically_Match (Desig_1, Desig_2));
5302 -- Otherwise definitely no match
5305 if ((Ekind (Type_1) = E_Anonymous_Access_Type
5306 and then Is_Access_Type (Type_2))
5307 or else (Ekind (Type_2) = E_Anonymous_Access_Type
5308 and then Is_Access_Type (Type_1)))
5311 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
5313 May_Hide_Profile := True;
5318 end Conforming_Types;
5320 --------------------------
5321 -- Create_Extra_Formals --
5322 --------------------------
5324 procedure Create_Extra_Formals (E : Entity_Id) is
5326 First_Extra : Entity_Id := Empty;
5327 Last_Extra : Entity_Id;
5328 Formal_Type : Entity_Id;
5329 P_Formal : Entity_Id := Empty;
5331 function Add_Extra_Formal
5332 (Assoc_Entity : Entity_Id;
5335 Suffix : String) return Entity_Id;
5336 -- Add an extra formal to the current list of formals and extra formals.
5337 -- The extra formal is added to the end of the list of extra formals,
5338 -- and also returned as the result. These formals are always of mode IN.
5339 -- The new formal has the type Typ, is declared in Scope, and its name
5340 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5342 ----------------------
5343 -- Add_Extra_Formal --
5344 ----------------------
5346 function Add_Extra_Formal
5347 (Assoc_Entity : Entity_Id;
5350 Suffix : String) return Entity_Id
5352 EF : constant Entity_Id :=
5353 Make_Defining_Identifier (Sloc (Assoc_Entity),
5354 Chars => New_External_Name (Chars (Assoc_Entity),
5358 -- A little optimization. Never generate an extra formal for the
5359 -- _init operand of an initialization procedure, since it could
5362 if Chars (Formal) = Name_uInit then
5366 Set_Ekind (EF, E_In_Parameter);
5367 Set_Actual_Subtype (EF, Typ);
5368 Set_Etype (EF, Typ);
5369 Set_Scope (EF, Scope);
5370 Set_Mechanism (EF, Default_Mechanism);
5371 Set_Formal_Validity (EF);
5373 if No (First_Extra) then
5375 Set_Extra_Formals (Scope, First_Extra);
5378 if Present (Last_Extra) then
5379 Set_Extra_Formal (Last_Extra, EF);
5385 end Add_Extra_Formal;
5387 -- Start of processing for Create_Extra_Formals
5390 -- We never generate extra formals if expansion is not active
5391 -- because we don't need them unless we are generating code.
5393 if not Expander_Active then
5397 -- If this is a derived subprogram then the subtypes of the parent
5398 -- subprogram's formal parameters will be used to determine the need
5399 -- for extra formals.
5401 if Is_Overloadable (E) and then Present (Alias (E)) then
5402 P_Formal := First_Formal (Alias (E));
5405 Last_Extra := Empty;
5406 Formal := First_Formal (E);
5407 while Present (Formal) loop
5408 Last_Extra := Formal;
5409 Next_Formal (Formal);
5412 -- If Extra_formals were already created, don't do it again. This
5413 -- situation may arise for subprogram types created as part of
5414 -- dispatching calls (see Expand_Dispatching_Call)
5416 if Present (Last_Extra) and then
5417 Present (Extra_Formal (Last_Extra))
5422 -- If the subprogram is a predefined dispatching subprogram then don't
5423 -- generate any extra constrained or accessibility level formals. In
5424 -- general we suppress these for internal subprograms (by not calling
5425 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5426 -- generated stream attributes do get passed through because extra
5427 -- build-in-place formals are needed in some cases (limited 'Input
).
5429 if Is_Predefined_Dispatching_Operation
(E
) then
5430 goto Test_For_BIP_Extras
;
5433 Formal
:= First_Formal
(E
);
5434 while Present
(Formal
) loop
5436 -- Create extra formal for supporting the attribute 'Constrained.
5437 -- The case of a private type view without discriminants also
5438 -- requires the extra formal if the underlying type has defaulted
5441 if Ekind
(Formal
) /= E_In_Parameter
then
5442 if Present
(P_Formal
) then
5443 Formal_Type
:= Etype
(P_Formal
);
5445 Formal_Type
:= Etype
(Formal
);
5448 -- Do not produce extra formals for Unchecked_Union parameters.
5449 -- Jump directly to the end of the loop.
5451 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
5452 goto Skip_Extra_Formal_Generation
;
5455 if not Has_Discriminants
(Formal_Type
)
5456 and then Ekind
(Formal_Type
) in Private_Kind
5457 and then Present
(Underlying_Type
(Formal_Type
))
5459 Formal_Type
:= Underlying_Type
(Formal_Type
);
5462 if Has_Discriminants
(Formal_Type
)
5463 and then not Is_Constrained
(Formal_Type
)
5464 and then not Is_Indefinite_Subtype
(Formal_Type
)
5466 Set_Extra_Constrained
5467 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "F"));
5471 -- Create extra formal for supporting accessibility checking. This
5472 -- is done for both anonymous access formals and formals of named
5473 -- access types that are marked as controlling formals. The latter
5474 -- case can occur when Expand_Dispatching_Call creates a subprogram
5475 -- type and substitutes the types of access-to-class-wide actuals
5476 -- for the anonymous access-to-specific-type of controlling formals.
5477 -- Base_Type is applied because in cases where there is a null
5478 -- exclusion the formal may have an access subtype.
5480 -- This is suppressed if we specifically suppress accessibility
5481 -- checks at the package level for either the subprogram, or the
5482 -- package in which it resides. However, we do not suppress it
5483 -- simply if the scope has accessibility checks suppressed, since
5484 -- this could cause trouble when clients are compiled with a
5485 -- different suppression setting. The explicit checks at the
5486 -- package level are safe from this point of view.
5488 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
5489 or else (Is_Controlling_Formal
(Formal
)
5490 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
5492 (Explicit_Suppress
(E
, Accessibility_Check
)
5494 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
5497 or else Present
(Extra_Accessibility
(P_Formal
)))
5499 Set_Extra_Accessibility
5500 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "F"));
5503 -- This label is required when skipping extra formal generation for
5504 -- Unchecked_Union parameters.
5506 <<Skip_Extra_Formal_Generation
>>
5508 if Present
(P_Formal
) then
5509 Next_Formal
(P_Formal
);
5512 Next_Formal
(Formal
);
5515 <<Test_For_BIP_Extras
>>
5517 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5518 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5520 if Ada_Version
>= Ada_05
and then Is_Build_In_Place_Function
(E
) then
5522 Result_Subt
: constant Entity_Id
:= Etype
(E
);
5524 Discard
: Entity_Id
;
5525 pragma Warnings
(Off
, Discard
);
5528 -- In the case of functions with unconstrained result subtypes,
5529 -- add a 3-state formal indicating whether the return object is
5530 -- allocated by the caller (0), or should be allocated by the
5531 -- callee on the secondary stack (1) or in the global heap (2).
5532 -- For the moment we just use Natural for the type of this formal.
5533 -- Note that this formal isn't usually needed in the case where
5534 -- the result subtype is constrained, but it is needed when the
5535 -- function has a tagged result, because generally such functions
5536 -- can be called in a dispatching context and such calls must be
5537 -- handled like calls to a class-wide function.
5539 if not Is_Constrained
(Underlying_Type
(Result_Subt
))
5540 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5544 (E
, Standard_Natural
,
5545 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
5548 -- In the case of functions whose result type has controlled
5549 -- parts, we have an extra formal of type
5550 -- System.Finalization_Implementation.Finalizable_Ptr_Ptr. That
5551 -- is, we are passing a pointer to a finalization list (which is
5552 -- itself a pointer). This extra formal is then passed along to
5553 -- Move_Final_List in case of successful completion of a return
5554 -- statement. We cannot pass an 'in out' parameter, because we
5555 -- need to update the finalization list during an abort-deferred
5556 -- region, rather than using copy-back after the function
5557 -- returns. This is true even if we are able to get away with
5558 -- having 'in out' parameters, which are normally illegal for
5559 -- functions. This formal is also needed when the function has
5562 if Needs_BIP_Final_List
(E
) then
5565 (E
, RTE
(RE_Finalizable_Ptr_Ptr
),
5566 E
, BIP_Formal_Suffix
(BIP_Final_List
));
5569 -- If the result type contains tasks, we have two extra formals:
5570 -- the master of the tasks to be created, and the caller's
5571 -- activation chain.
5573 if Has_Task
(Result_Subt
) then
5576 (E
, RTE
(RE_Master_Id
),
5577 E
, BIP_Formal_Suffix
(BIP_Master
));
5580 (E
, RTE
(RE_Activation_Chain_Access
),
5581 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
5584 -- All build-in-place functions get an extra formal that will be
5585 -- passed the address of the return object within the caller.
5588 Formal_Type
: constant Entity_Id
:=
5590 (E_Anonymous_Access_Type
, E
,
5591 Scope_Id
=> Scope
(E
));
5593 Set_Directly_Designated_Type
(Formal_Type
, Result_Subt
);
5594 Set_Etype
(Formal_Type
, Formal_Type
);
5595 Set_Depends_On_Private
5596 (Formal_Type
, Has_Private_Component
(Formal_Type
));
5597 Set_Is_Public
(Formal_Type
, Is_Public
(Scope
(Formal_Type
)));
5598 Set_Is_Access_Constant
(Formal_Type
, False);
5600 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5601 -- the designated type comes from the limited view (for
5602 -- back-end purposes).
5604 Set_From_With_Type
(Formal_Type
, From_With_Type
(Result_Subt
));
5606 Layout_Type
(Formal_Type
);
5610 (E
, Formal_Type
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
5614 end Create_Extra_Formals
;
5616 -----------------------------
5617 -- Enter_Overloaded_Entity --
5618 -----------------------------
5620 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
5621 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
5622 C_E
: Entity_Id
:= Current_Entity
(S
);
5626 Set_Has_Homonym
(E
);
5627 Set_Has_Homonym
(S
);
5630 Set_Is_Immediately_Visible
(S
);
5631 Set_Scope
(S
, Current_Scope
);
5633 -- Chain new entity if front of homonym in current scope, so that
5634 -- homonyms are contiguous.
5639 while Homonym
(C_E
) /= E
loop
5640 C_E
:= Homonym
(C_E
);
5643 Set_Homonym
(C_E
, S
);
5647 Set_Current_Entity
(S
);
5652 Append_Entity
(S
, Current_Scope
);
5653 Set_Public_Status
(S
);
5655 if Debug_Flag_E
then
5656 Write_Str
("New overloaded entity chain: ");
5657 Write_Name
(Chars
(S
));
5660 while Present
(E
) loop
5661 Write_Str
(" "); Write_Int
(Int
(E
));
5668 -- Generate warning for hiding
5671 and then Comes_From_Source
(S
)
5672 and then In_Extended_Main_Source_Unit
(S
)
5679 -- Warn unless genuine overloading
5681 if (not Is_Overloadable
(E
) or else Subtype_Conformant
(E
, S
))
5682 and then (Is_Immediately_Visible
(E
)
5684 Is_Potentially_Use_Visible
(S
))
5686 Error_Msg_Sloc
:= Sloc
(E
);
5687 Error_Msg_N
("declaration of & hides one#?", S
);
5691 end Enter_Overloaded_Entity
;
5693 -----------------------------
5694 -- Find_Corresponding_Spec --
5695 -----------------------------
5697 function Find_Corresponding_Spec
5699 Post_Error
: Boolean := True) return Entity_Id
5701 Spec
: constant Node_Id
:= Specification
(N
);
5702 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
5707 E
:= Current_Entity
(Designator
);
5708 while Present
(E
) loop
5710 -- We are looking for a matching spec. It must have the same scope,
5711 -- and the same name, and either be type conformant, or be the case
5712 -- of a library procedure spec and its body (which belong to one
5713 -- another regardless of whether they are type conformant or not).
5715 if Scope
(E
) = Current_Scope
then
5716 if Current_Scope
= Standard_Standard
5717 or else (Ekind
(E
) = Ekind
(Designator
)
5718 and then Type_Conformant
(E
, Designator
))
5720 -- Within an instantiation, we know that spec and body are
5721 -- subtype conformant, because they were subtype conformant
5722 -- in the generic. We choose the subtype-conformant entity
5723 -- here as well, to resolve spurious ambiguities in the
5724 -- instance that were not present in the generic (i.e. when
5725 -- two different types are given the same actual). If we are
5726 -- looking for a spec to match a body, full conformance is
5730 Set_Convention
(Designator
, Convention
(E
));
5732 if Nkind
(N
) = N_Subprogram_Body
5733 and then Present
(Homonym
(E
))
5734 and then not Fully_Conformant
(E
, Designator
)
5738 elsif not Subtype_Conformant
(E
, Designator
) then
5743 if not Has_Completion
(E
) then
5744 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
5745 Set_Corresponding_Spec
(N
, E
);
5748 Set_Has_Completion
(E
);
5751 elsif Nkind
(Parent
(N
)) = N_Subunit
then
5753 -- If this is the proper body of a subunit, the completion
5754 -- flag is set when analyzing the stub.
5758 -- If E is an internal function with a controlling result
5759 -- that was created for an operation inherited by a null
5760 -- extension, it may be overridden by a body without a previous
5761 -- spec (one more reason why these should be shunned). In that
5762 -- case remove the generated body, because the current one is
5763 -- the explicit overriding.
5765 elsif Ekind
(E
) = E_Function
5766 and then Ada_Version
>= Ada_05
5767 and then not Comes_From_Source
(E
)
5768 and then Has_Controlling_Result
(E
)
5769 and then Is_Null_Extension
(Etype
(E
))
5770 and then Comes_From_Source
(Spec
)
5772 Set_Has_Completion
(E
, False);
5774 if Expander_Active
then
5776 (Unit_Declaration_Node
5777 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
5780 -- If expansion is disabled, the wrapper function has not
5781 -- been generated, and this is the standard case of a late
5782 -- body overriding an inherited operation.
5788 -- If the body already exists, then this is an error unless
5789 -- the previous declaration is the implicit declaration of a
5790 -- derived subprogram, or this is a spurious overloading in an
5793 elsif No
(Alias
(E
))
5794 and then not Is_Intrinsic_Subprogram
(E
)
5795 and then not In_Instance
5798 Error_Msg_Sloc
:= Sloc
(E
);
5800 if Is_Imported
(E
) then
5802 ("body not allowed for imported subprogram & declared#",
5805 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
5809 -- Child units cannot be overloaded, so a conformance mismatch
5810 -- between body and a previous spec is an error.
5812 elsif Is_Child_Unit
(E
)
5814 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
5816 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
5821 ("body of child unit does not match previous declaration", N
);
5829 -- On exit, we know that no previous declaration of subprogram exists
5832 end Find_Corresponding_Spec
;
5834 ----------------------
5835 -- Fully_Conformant --
5836 ----------------------
5838 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
5841 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
5843 end Fully_Conformant
;
5845 ----------------------------------
5846 -- Fully_Conformant_Expressions --
5847 ----------------------------------
5849 function Fully_Conformant_Expressions
5850 (Given_E1
: Node_Id
;
5851 Given_E2
: Node_Id
) return Boolean
5853 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
5854 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
5855 -- We always test conformance on original nodes, since it is possible
5856 -- for analysis and/or expansion to make things look as though they
5857 -- conform when they do not, e.g. by converting 1+2 into 3.
5859 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
5860 renames Fully_Conformant_Expressions
;
5862 function FCL
(L1
, L2
: List_Id
) return Boolean;
5863 -- Compare elements of two lists for conformance. Elements have to
5864 -- be conformant, and actuals inserted as default parameters do not
5865 -- match explicit actuals with the same value.
5867 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
5868 -- Compare an operator node with a function call
5874 function FCL
(L1
, L2
: List_Id
) return Boolean is
5878 if L1
= No_List
then
5884 if L2
= No_List
then
5890 -- Compare two lists, skipping rewrite insertions (we want to
5891 -- compare the original trees, not the expanded versions!)
5894 if Is_Rewrite_Insertion
(N1
) then
5896 elsif Is_Rewrite_Insertion
(N2
) then
5902 elsif not FCE
(N1
, N2
) then
5915 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
5916 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
5921 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
5926 Act
:= First
(Actuals
);
5928 if Nkind
(Op_Node
) in N_Binary_Op
then
5929 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
5936 return Present
(Act
)
5937 and then FCE
(Right_Opnd
(Op_Node
), Act
)
5938 and then No
(Next
(Act
));
5942 -- Start of processing for Fully_Conformant_Expressions
5945 -- Non-conformant if paren count does not match. Note: if some idiot
5946 -- complains that we don't do this right for more than 3 levels of
5947 -- parentheses, they will be treated with the respect they deserve!
5949 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
5952 -- If same entities are referenced, then they are conformant even if
5953 -- they have different forms (RM 8.3.1(19-20)).
5955 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
5956 if Present
(Entity
(E1
)) then
5957 return Entity
(E1
) = Entity
(E2
)
5958 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
5959 and then Ekind
(Entity
(E1
)) = E_Discriminant
5960 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
5962 elsif Nkind
(E1
) = N_Expanded_Name
5963 and then Nkind
(E2
) = N_Expanded_Name
5964 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5965 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5967 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
5970 -- Identifiers in component associations don't always have
5971 -- entities, but their names must conform.
5973 return Nkind
(E1
) = N_Identifier
5974 and then Nkind
(E2
) = N_Identifier
5975 and then Chars
(E1
) = Chars
(E2
);
5978 elsif Nkind
(E1
) = N_Character_Literal
5979 and then Nkind
(E2
) = N_Expanded_Name
5981 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
5982 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
5984 elsif Nkind
(E2
) = N_Character_Literal
5985 and then Nkind
(E1
) = N_Expanded_Name
5987 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
5988 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
5990 elsif Nkind
(E1
) in N_Op
5991 and then Nkind
(E2
) = N_Function_Call
5993 return FCO
(E1
, E2
);
5995 elsif Nkind
(E2
) in N_Op
5996 and then Nkind
(E1
) = N_Function_Call
5998 return FCO
(E2
, E1
);
6000 -- Otherwise we must have the same syntactic entity
6002 elsif Nkind
(E1
) /= Nkind
(E2
) then
6005 -- At this point, we specialize by node type
6012 FCL
(Expressions
(E1
), Expressions
(E2
))
6013 and then FCL
(Component_Associations
(E1
),
6014 Component_Associations
(E2
));
6017 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
6019 Nkind
(Expression
(E2
)) = N_Qualified_Expression
6021 return FCE
(Expression
(E1
), Expression
(E2
));
6023 -- Check that the subtype marks and any constraints
6028 Indic1
: constant Node_Id
:= Expression
(E1
);
6029 Indic2
: constant Node_Id
:= Expression
(E2
);
6034 if Nkind
(Indic1
) /= N_Subtype_Indication
then
6036 Nkind
(Indic2
) /= N_Subtype_Indication
6037 and then Entity
(Indic1
) = Entity
(Indic2
);
6039 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
6041 Nkind
(Indic1
) /= N_Subtype_Indication
6042 and then Entity
(Indic1
) = Entity
(Indic2
);
6045 if Entity
(Subtype_Mark
(Indic1
)) /=
6046 Entity
(Subtype_Mark
(Indic2
))
6051 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
6052 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
6053 while Present
(Elt1
) and then Present
(Elt2
) loop
6054 if not FCE
(Elt1
, Elt2
) then
6067 when N_Attribute_Reference
=>
6069 Attribute_Name
(E1
) = Attribute_Name
(E2
)
6070 and then FCL
(Expressions
(E1
), Expressions
(E2
));
6074 Entity
(E1
) = Entity
(E2
)
6075 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
6076 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6078 when N_Short_Circuit | N_Membership_Test
=>
6080 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
6082 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6084 when N_Character_Literal
=>
6086 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
6088 when N_Component_Association
=>
6090 FCL
(Choices
(E1
), Choices
(E2
))
6091 and then FCE
(Expression
(E1
), Expression
(E2
));
6093 when N_Conditional_Expression
=>
6095 FCL
(Expressions
(E1
), Expressions
(E2
));
6097 when N_Explicit_Dereference
=>
6099 FCE
(Prefix
(E1
), Prefix
(E2
));
6101 when N_Extension_Aggregate
=>
6103 FCL
(Expressions
(E1
), Expressions
(E2
))
6104 and then Null_Record_Present
(E1
) =
6105 Null_Record_Present
(E2
)
6106 and then FCL
(Component_Associations
(E1
),
6107 Component_Associations
(E2
));
6109 when N_Function_Call
=>
6111 FCE
(Name
(E1
), Name
(E2
))
6112 and then FCL
(Parameter_Associations
(E1
),
6113 Parameter_Associations
(E2
));
6115 when N_Indexed_Component
=>
6117 FCE
(Prefix
(E1
), Prefix
(E2
))
6118 and then FCL
(Expressions
(E1
), Expressions
(E2
));
6120 when N_Integer_Literal
=>
6121 return (Intval
(E1
) = Intval
(E2
));
6126 when N_Operator_Symbol
=>
6128 Chars
(E1
) = Chars
(E2
);
6130 when N_Others_Choice
=>
6133 when N_Parameter_Association
=>
6135 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
6136 and then FCE
(Explicit_Actual_Parameter
(E1
),
6137 Explicit_Actual_Parameter
(E2
));
6139 when N_Qualified_Expression
=>
6141 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6142 and then FCE
(Expression
(E1
), Expression
(E2
));
6146 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
6147 and then FCE
(High_Bound
(E1
), High_Bound
(E2
));
6149 when N_Real_Literal
=>
6150 return (Realval
(E1
) = Realval
(E2
));
6152 when N_Selected_Component
=>
6154 FCE
(Prefix
(E1
), Prefix
(E2
))
6155 and then FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
6159 FCE
(Prefix
(E1
), Prefix
(E2
))
6160 and then FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
6162 when N_String_Literal
=>
6164 S1
: constant String_Id
:= Strval
(E1
);
6165 S2
: constant String_Id
:= Strval
(E2
);
6166 L1
: constant Nat
:= String_Length
(S1
);
6167 L2
: constant Nat
:= String_Length
(S2
);
6174 for J
in 1 .. L1
loop
6175 if Get_String_Char
(S1
, J
) /=
6176 Get_String_Char
(S2
, J
)
6186 when N_Type_Conversion
=>
6188 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6189 and then FCE
(Expression
(E1
), Expression
(E2
));
6193 Entity
(E1
) = Entity
(E2
)
6194 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6196 when N_Unchecked_Type_Conversion
=>
6198 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6199 and then FCE
(Expression
(E1
), Expression
(E2
));
6201 -- All other node types cannot appear in this context. Strictly
6202 -- we should raise a fatal internal error. Instead we just ignore
6203 -- the nodes. This means that if anyone makes a mistake in the
6204 -- expander and mucks an expression tree irretrievably, the
6205 -- result will be a failure to detect a (probably very obscure)
6206 -- case of non-conformance, which is better than bombing on some
6207 -- case where two expressions do in fact conform.
6214 end Fully_Conformant_Expressions
;
6216 ----------------------------------------
6217 -- Fully_Conformant_Discrete_Subtypes --
6218 ----------------------------------------
6220 function Fully_Conformant_Discrete_Subtypes
6221 (Given_S1
: Node_Id
;
6222 Given_S2
: Node_Id
) return Boolean
6224 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
6225 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
6227 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
6228 -- Special-case for a bound given by a discriminant, which in the body
6229 -- is replaced with the discriminal of the enclosing type.
6231 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
6232 -- Check both bounds
6234 -----------------------
6235 -- Conforming_Bounds --
6236 -----------------------
6238 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
6240 if Is_Entity_Name
(B1
)
6241 and then Is_Entity_Name
(B2
)
6242 and then Ekind
(Entity
(B1
)) = E_Discriminant
6244 return Chars
(B1
) = Chars
(B2
);
6247 return Fully_Conformant_Expressions
(B1
, B2
);
6249 end Conforming_Bounds
;
6251 -----------------------
6252 -- Conforming_Ranges --
6253 -----------------------
6255 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
6258 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
6260 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
6261 end Conforming_Ranges
;
6263 -- Start of processing for Fully_Conformant_Discrete_Subtypes
6266 if Nkind
(S1
) /= Nkind
(S2
) then
6269 elsif Is_Entity_Name
(S1
) then
6270 return Entity
(S1
) = Entity
(S2
);
6272 elsif Nkind
(S1
) = N_Range
then
6273 return Conforming_Ranges
(S1
, S2
);
6275 elsif Nkind
(S1
) = N_Subtype_Indication
then
6277 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
6280 (Range_Expression
(Constraint
(S1
)),
6281 Range_Expression
(Constraint
(S2
)));
6285 end Fully_Conformant_Discrete_Subtypes
;
6287 --------------------
6288 -- Install_Entity --
6289 --------------------
6291 procedure Install_Entity
(E
: Entity_Id
) is
6292 Prev
: constant Entity_Id
:= Current_Entity
(E
);
6294 Set_Is_Immediately_Visible
(E
);
6295 Set_Current_Entity
(E
);
6296 Set_Homonym
(E
, Prev
);
6299 ---------------------
6300 -- Install_Formals --
6301 ---------------------
6303 procedure Install_Formals
(Id
: Entity_Id
) is
6306 F
:= First_Formal
(Id
);
6307 while Present
(F
) loop
6311 end Install_Formals
;
6313 -----------------------------
6314 -- Is_Interface_Conformant --
6315 -----------------------------
6317 function Is_Interface_Conformant
6318 (Tagged_Type
: Entity_Id
;
6319 Iface_Prim
: Entity_Id
;
6320 Prim
: Entity_Id
) return Boolean
6322 Iface
: constant Entity_Id
:= Find_Dispatching_Type
(Iface_Prim
);
6323 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
6326 pragma Assert
(Is_Subprogram
(Iface_Prim
)
6327 and then Is_Subprogram
(Prim
)
6328 and then Is_Dispatching_Operation
(Iface_Prim
)
6329 and then Is_Dispatching_Operation
(Prim
));
6331 pragma Assert
(Is_Interface
(Iface
)
6332 or else (Present
(Alias
(Iface_Prim
))
6335 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
6337 if Prim
= Iface_Prim
6338 or else not Is_Subprogram
(Prim
)
6339 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
6340 or else not Is_Dispatching_Operation
(Prim
)
6341 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
6343 or else Base_Type
(Typ
) /= Tagged_Type
6344 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
6348 -- Case of a procedure, or a function that does not have a controlling
6349 -- result (I or access I).
6351 elsif Ekind
(Iface_Prim
) = E_Procedure
6352 or else Etype
(Prim
) = Etype
(Iface_Prim
)
6353 or else not Has_Controlling_Result
(Prim
)
6355 return Type_Conformant
(Prim
, Iface_Prim
,
6356 Skip_Controlling_Formals
=> True);
6358 -- Case of a function returning an interface, or an access to one.
6359 -- Check that the return types correspond.
6361 elsif Implements_Interface
(Typ
, Iface
) then
6362 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
6364 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
6369 Type_Conformant
(Prim
, Iface_Prim
,
6370 Skip_Controlling_Formals
=> True);
6376 end Is_Interface_Conformant
;
6378 ---------------------------------
6379 -- Is_Non_Overriding_Operation --
6380 ---------------------------------
6382 function Is_Non_Overriding_Operation
6383 (Prev_E
: Entity_Id
;
6384 New_E
: Entity_Id
) return Boolean
6388 G_Typ
: Entity_Id
:= Empty
;
6390 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
6391 -- If F_Type is a derived type associated with a generic actual subtype,
6392 -- then return its Generic_Parent_Type attribute, else return Empty.
6394 function Types_Correspond
6395 (P_Type
: Entity_Id
;
6396 N_Type
: Entity_Id
) return Boolean;
6397 -- Returns true if and only if the types (or designated types in the
6398 -- case of anonymous access types) are the same or N_Type is derived
6399 -- directly or indirectly from P_Type.
6401 -----------------------------
6402 -- Get_Generic_Parent_Type --
6403 -----------------------------
6405 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
6410 if Is_Derived_Type
(F_Typ
)
6411 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
6413 -- The tree must be traversed to determine the parent subtype in
6414 -- the generic unit, which unfortunately isn't always available
6415 -- via semantic attributes. ??? (Note: The use of Original_Node
6416 -- is needed for cases where a full derived type has been
6419 Indic
:= Subtype_Indication
6420 (Type_Definition
(Original_Node
(Parent
(F_Typ
))));
6422 if Nkind
(Indic
) = N_Subtype_Indication
then
6423 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
6425 G_Typ
:= Entity
(Indic
);
6428 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
6429 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
6431 return Generic_Parent_Type
(Parent
(G_Typ
));
6436 end Get_Generic_Parent_Type
;
6438 ----------------------
6439 -- Types_Correspond --
6440 ----------------------
6442 function Types_Correspond
6443 (P_Type
: Entity_Id
;
6444 N_Type
: Entity_Id
) return Boolean
6446 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
6447 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
6450 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
6451 Prev_Type
:= Designated_Type
(Prev_Type
);
6454 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
6455 New_Type
:= Designated_Type
(New_Type
);
6458 if Prev_Type
= New_Type
then
6461 elsif not Is_Class_Wide_Type
(New_Type
) then
6462 while Etype
(New_Type
) /= New_Type
loop
6463 New_Type
:= Etype
(New_Type
);
6464 if New_Type
= Prev_Type
then
6470 end Types_Correspond
;
6472 -- Start of processing for Is_Non_Overriding_Operation
6475 -- In the case where both operations are implicit derived subprograms
6476 -- then neither overrides the other. This can only occur in certain
6477 -- obscure cases (e.g., derivation from homographs created in a generic
6480 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
6483 elsif Ekind
(Current_Scope
) = E_Package
6484 and then Is_Generic_Instance
(Current_Scope
)
6485 and then In_Private_Part
(Current_Scope
)
6486 and then Comes_From_Source
(New_E
)
6488 -- We examine the formals and result subtype of the inherited
6489 -- operation, to determine whether their type is derived from (the
6490 -- instance of) a generic type.
6492 Formal
:= First_Formal
(Prev_E
);
6494 while Present
(Formal
) loop
6495 F_Typ
:= Base_Type
(Etype
(Formal
));
6497 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
6498 F_Typ
:= Designated_Type
(F_Typ
);
6501 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
6503 Next_Formal
(Formal
);
6506 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
6507 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
6514 -- If the generic type is a private type, then the original operation
6515 -- was not overriding in the generic, because there was no primitive
6516 -- operation to override.
6518 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
6519 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
6520 N_Formal_Private_Type_Definition
6524 -- The generic parent type is the ancestor of a formal derived
6525 -- type declaration. We need to check whether it has a primitive
6526 -- operation that should be overridden by New_E in the generic.
6530 P_Formal
: Entity_Id
;
6531 N_Formal
: Entity_Id
;
6535 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
6538 while Present
(Prim_Elt
) loop
6539 P_Prim
:= Node
(Prim_Elt
);
6541 if Chars
(P_Prim
) = Chars
(New_E
)
6542 and then Ekind
(P_Prim
) = Ekind
(New_E
)
6544 P_Formal
:= First_Formal
(P_Prim
);
6545 N_Formal
:= First_Formal
(New_E
);
6546 while Present
(P_Formal
) and then Present
(N_Formal
) loop
6547 P_Typ
:= Etype
(P_Formal
);
6548 N_Typ
:= Etype
(N_Formal
);
6550 if not Types_Correspond
(P_Typ
, N_Typ
) then
6554 Next_Entity
(P_Formal
);
6555 Next_Entity
(N_Formal
);
6558 -- Found a matching primitive operation belonging to the
6559 -- formal ancestor type, so the new subprogram is
6563 and then No
(N_Formal
)
6564 and then (Ekind
(New_E
) /= E_Function
6567 (Etype
(P_Prim
), Etype
(New_E
)))
6573 Next_Elmt
(Prim_Elt
);
6576 -- If no match found, then the new subprogram does not
6577 -- override in the generic (nor in the instance).
6585 end Is_Non_Overriding_Operation
;
6587 ------------------------------
6588 -- Make_Inequality_Operator --
6589 ------------------------------
6591 -- S is the defining identifier of an equality operator. We build a
6592 -- subprogram declaration with the right signature. This operation is
6593 -- intrinsic, because it is always expanded as the negation of the
6594 -- call to the equality function.
6596 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
6597 Loc
: constant Source_Ptr
:= Sloc
(S
);
6600 Op_Name
: Entity_Id
;
6602 FF
: constant Entity_Id
:= First_Formal
(S
);
6603 NF
: constant Entity_Id
:= Next_Formal
(FF
);
6606 -- Check that equality was properly defined, ignore call if not
6613 A
: constant Entity_Id
:=
6614 Make_Defining_Identifier
(Sloc
(FF
),
6615 Chars
=> Chars
(FF
));
6617 B
: constant Entity_Id
:=
6618 Make_Defining_Identifier
(Sloc
(NF
),
6619 Chars
=> Chars
(NF
));
6622 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
6624 Formals
:= New_List
(
6625 Make_Parameter_Specification
(Loc
,
6626 Defining_Identifier
=> A
,
6628 New_Reference_To
(Etype
(First_Formal
(S
)),
6629 Sloc
(Etype
(First_Formal
(S
))))),
6631 Make_Parameter_Specification
(Loc
,
6632 Defining_Identifier
=> B
,
6634 New_Reference_To
(Etype
(Next_Formal
(First_Formal
(S
))),
6635 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
6638 Make_Subprogram_Declaration
(Loc
,
6640 Make_Function_Specification
(Loc
,
6641 Defining_Unit_Name
=> Op_Name
,
6642 Parameter_Specifications
=> Formals
,
6643 Result_Definition
=>
6644 New_Reference_To
(Standard_Boolean
, Loc
)));
6646 -- Insert inequality right after equality if it is explicit or after
6647 -- the derived type when implicit. These entities are created only
6648 -- for visibility purposes, and eventually replaced in the course of
6649 -- expansion, so they do not need to be attached to the tree and seen
6650 -- by the back-end. Keeping them internal also avoids spurious
6651 -- freezing problems. The declaration is inserted in the tree for
6652 -- analysis, and removed afterwards. If the equality operator comes
6653 -- from an explicit declaration, attach the inequality immediately
6654 -- after. Else the equality is inherited from a derived type
6655 -- declaration, so insert inequality after that declaration.
6657 if No
(Alias
(S
)) then
6658 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
6659 elsif Is_List_Member
(Parent
(S
)) then
6660 Insert_After
(Parent
(S
), Decl
);
6662 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
6665 Mark_Rewrite_Insertion
(Decl
);
6666 Set_Is_Intrinsic_Subprogram
(Op_Name
);
6669 Set_Has_Completion
(Op_Name
);
6670 Set_Corresponding_Equality
(Op_Name
, S
);
6671 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
6673 end Make_Inequality_Operator
;
6675 ----------------------
6676 -- May_Need_Actuals --
6677 ----------------------
6679 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
6684 F
:= First_Formal
(Fun
);
6686 while Present
(F
) loop
6687 if No
(Default_Value
(F
)) then
6695 Set_Needs_No_Actuals
(Fun
, B
);
6696 end May_Need_Actuals
;
6698 ---------------------
6699 -- Mode_Conformant --
6700 ---------------------
6702 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
6705 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
6707 end Mode_Conformant
;
6709 ---------------------------
6710 -- New_Overloaded_Entity --
6711 ---------------------------
6713 procedure New_Overloaded_Entity
6715 Derived_Type
: Entity_Id
:= Empty
)
6717 Overridden_Subp
: Entity_Id
:= Empty
;
6718 -- Set if the current scope has an operation that is type-conformant
6719 -- with S, and becomes hidden by S.
6721 Is_Primitive_Subp
: Boolean;
6722 -- Set to True if the new subprogram is primitive
6725 -- Entity that S overrides
6727 Prev_Vis
: Entity_Id
:= Empty
;
6728 -- Predecessor of E in Homonym chain
6730 procedure Check_For_Primitive_Subprogram
6731 (Is_Primitive
: out Boolean;
6732 Is_Overriding
: Boolean := False);
6733 -- If the subprogram being analyzed is a primitive operation of the type
6734 -- of a formal or result, set the Has_Primitive_Operations flag on the
6735 -- type, and set Is_Primitive to True (otherwise set to False). Set the
6736 -- corresponding flag on the entity itself for later use.
6738 procedure Check_Synchronized_Overriding
6739 (Def_Id
: Entity_Id
;
6740 Overridden_Subp
: out Entity_Id
);
6741 -- First determine if Def_Id is an entry or a subprogram either defined
6742 -- in the scope of a task or protected type, or is a primitive of such
6743 -- a type. Check whether Def_Id overrides a subprogram of an interface
6744 -- implemented by the synchronized type, return the overridden entity
6747 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
6748 -- Check that E is declared in the private part of the current package,
6749 -- or in the package body, where it may hide a previous declaration.
6750 -- We can't use In_Private_Part by itself because this flag is also
6751 -- set when freezing entities, so we must examine the place of the
6752 -- declaration in the tree, and recognize wrapper packages as well.
6754 function Is_Overriding_Alias
6756 New_E
: Entity_Id
) return Boolean;
6757 -- Check whether new subprogram and old subprogram are both inherited
6758 -- from subprograms that have distinct dispatch table entries. This can
6759 -- occur with derivations from instances with accidental homonyms.
6760 -- The function is conservative given that the converse is only true
6761 -- within instances that contain accidental overloadings.
6763 ------------------------------------
6764 -- Check_For_Primitive_Subprogram --
6765 ------------------------------------
6767 procedure Check_For_Primitive_Subprogram
6768 (Is_Primitive
: out Boolean;
6769 Is_Overriding
: Boolean := False)
6775 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
6776 -- Returns true if T is declared in the visible part of the current
6777 -- package scope; otherwise returns false. Assumes that T is declared
6780 procedure Check_Private_Overriding
(T
: Entity_Id
);
6781 -- Checks that if a primitive abstract subprogram of a visible
6782 -- abstract type is declared in a private part, then it must override
6783 -- an abstract subprogram declared in the visible part. Also checks
6784 -- that if a primitive function with a controlling result is declared
6785 -- in a private part, then it must override a function declared in
6786 -- the visible part.
6788 ------------------------------
6789 -- Check_Private_Overriding --
6790 ------------------------------
6792 procedure Check_Private_Overriding
(T
: Entity_Id
) is
6794 if Is_Package_Or_Generic_Package
(Current_Scope
)
6795 and then In_Private_Part
(Current_Scope
)
6796 and then Visible_Part_Type
(T
)
6797 and then not In_Instance
6799 if Is_Abstract_Type
(T
)
6800 and then Is_Abstract_Subprogram
(S
)
6801 and then (not Is_Overriding
6802 or else not Is_Abstract_Subprogram
(E
))
6804 Error_Msg_N
("abstract subprograms must be visible "
6805 & "(RM 3.9.3(10))!", S
);
6807 elsif Ekind
(S
) = E_Function
6808 and then Is_Tagged_Type
(T
)
6809 and then T
= Base_Type
(Etype
(S
))
6810 and then not Is_Overriding
6813 ("private function with tagged result must"
6814 & " override visible-part function", S
);
6816 ("\move subprogram to the visible part"
6817 & " (RM 3.9.3(10))", S
);
6820 end Check_Private_Overriding
;
6822 -----------------------
6823 -- Visible_Part_Type --
6824 -----------------------
6826 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
6827 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
6831 -- If the entity is a private type, then it must be declared in a
6834 if Ekind
(T
) in Private_Kind
then
6838 -- Otherwise, we traverse the visible part looking for its
6839 -- corresponding declaration. We cannot use the declaration
6840 -- node directly because in the private part the entity of a
6841 -- private type is the one in the full view, which does not
6842 -- indicate that it is the completion of something visible.
6844 N
:= First
(Visible_Declarations
(Specification
(P
)));
6845 while Present
(N
) loop
6846 if Nkind
(N
) = N_Full_Type_Declaration
6847 and then Present
(Defining_Identifier
(N
))
6848 and then T
= Defining_Identifier
(N
)
6852 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
6853 N_Private_Extension_Declaration
)
6854 and then Present
(Defining_Identifier
(N
))
6855 and then T
= Full_View
(Defining_Identifier
(N
))
6864 end Visible_Part_Type
;
6866 -- Start of processing for Check_For_Primitive_Subprogram
6869 Is_Primitive
:= False;
6871 if not Comes_From_Source
(S
) then
6874 -- If subprogram is at library level, it is not primitive operation
6876 elsif Current_Scope
= Standard_Standard
then
6879 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
6880 and then not In_Package_Body
(Current_Scope
))
6881 or else Is_Overriding
6883 -- For function, check return type
6885 if Ekind
(S
) = E_Function
then
6886 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
6887 F_Typ
:= Designated_Type
(Etype
(S
));
6892 B_Typ
:= Base_Type
(F_Typ
);
6894 if Scope
(B_Typ
) = Current_Scope
6895 and then not Is_Class_Wide_Type
(B_Typ
)
6896 and then not Is_Generic_Type
(B_Typ
)
6898 Is_Primitive
:= True;
6899 Set_Has_Primitive_Operations
(B_Typ
);
6900 Set_Is_Primitive
(S
);
6901 Check_Private_Overriding
(B_Typ
);
6905 -- For all subprograms, check formals
6907 Formal
:= First_Formal
(S
);
6908 while Present
(Formal
) loop
6909 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
6910 F_Typ
:= Designated_Type
(Etype
(Formal
));
6912 F_Typ
:= Etype
(Formal
);
6915 B_Typ
:= Base_Type
(F_Typ
);
6917 if Ekind
(B_Typ
) = E_Access_Subtype
then
6918 B_Typ
:= Base_Type
(B_Typ
);
6921 if Scope
(B_Typ
) = Current_Scope
6922 and then not Is_Class_Wide_Type
(B_Typ
)
6923 and then not Is_Generic_Type
(B_Typ
)
6925 Is_Primitive
:= True;
6926 Set_Is_Primitive
(S
);
6927 Set_Has_Primitive_Operations
(B_Typ
);
6928 Check_Private_Overriding
(B_Typ
);
6931 Next_Formal
(Formal
);
6934 end Check_For_Primitive_Subprogram
;
6936 -----------------------------------
6937 -- Check_Synchronized_Overriding --
6938 -----------------------------------
6940 procedure Check_Synchronized_Overriding
6941 (Def_Id
: Entity_Id
;
6942 Overridden_Subp
: out Entity_Id
)
6944 Ifaces_List
: Elist_Id
;
6948 function Matches_Prefixed_View_Profile
6949 (Prim_Params
: List_Id
;
6950 Iface_Params
: List_Id
) return Boolean;
6951 -- Determine whether a subprogram's parameter profile Prim_Params
6952 -- matches that of a potentially overridden interface subprogram
6953 -- Iface_Params. Also determine if the type of first parameter of
6954 -- Iface_Params is an implemented interface.
6956 -----------------------------------
6957 -- Matches_Prefixed_View_Profile --
6958 -----------------------------------
6960 function Matches_Prefixed_View_Profile
6961 (Prim_Params
: List_Id
;
6962 Iface_Params
: List_Id
) return Boolean
6964 Iface_Id
: Entity_Id
;
6965 Iface_Param
: Node_Id
;
6966 Iface_Typ
: Entity_Id
;
6967 Prim_Id
: Entity_Id
;
6968 Prim_Param
: Node_Id
;
6969 Prim_Typ
: Entity_Id
;
6971 function Is_Implemented
6972 (Ifaces_List
: Elist_Id
;
6973 Iface
: Entity_Id
) return Boolean;
6974 -- Determine if Iface is implemented by the current task or
6977 --------------------
6978 -- Is_Implemented --
6979 --------------------
6981 function Is_Implemented
6982 (Ifaces_List
: Elist_Id
;
6983 Iface
: Entity_Id
) return Boolean
6985 Iface_Elmt
: Elmt_Id
;
6988 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
6989 while Present
(Iface_Elmt
) loop
6990 if Node
(Iface_Elmt
) = Iface
then
6994 Next_Elmt
(Iface_Elmt
);
7000 -- Start of processing for Matches_Prefixed_View_Profile
7003 Iface_Param
:= First
(Iface_Params
);
7004 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
7006 if Is_Access_Type
(Iface_Typ
) then
7007 Iface_Typ
:= Designated_Type
(Iface_Typ
);
7010 Prim_Param
:= First
(Prim_Params
);
7012 -- The first parameter of the potentially overridden subprogram
7013 -- must be an interface implemented by Prim.
7015 if not Is_Interface
(Iface_Typ
)
7016 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
7021 -- The checks on the object parameters are done, move onto the
7022 -- rest of the parameters.
7024 if not In_Scope
then
7025 Prim_Param
:= Next
(Prim_Param
);
7028 Iface_Param
:= Next
(Iface_Param
);
7029 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
7030 Iface_Id
:= Defining_Identifier
(Iface_Param
);
7031 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
7033 Prim_Id
:= Defining_Identifier
(Prim_Param
);
7034 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
7036 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
7037 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
7038 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
7040 Iface_Typ
:= Designated_Type
(Iface_Typ
);
7041 Prim_Typ
:= Designated_Type
(Prim_Typ
);
7044 -- Case of multiple interface types inside a parameter profile
7046 -- (Obj_Param : in out Iface; ...; Param : Iface)
7048 -- If the interface type is implemented, then the matching type
7049 -- in the primitive should be the implementing record type.
7051 if Ekind
(Iface_Typ
) = E_Record_Type
7052 and then Is_Interface
(Iface_Typ
)
7053 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
7055 if Prim_Typ
/= Typ
then
7059 -- The two parameters must be both mode and subtype conformant
7061 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
7063 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
7072 -- One of the two lists contains more parameters than the other
7074 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
7079 end Matches_Prefixed_View_Profile
;
7081 -- Start of processing for Check_Synchronized_Overriding
7084 Overridden_Subp
:= Empty
;
7086 -- Def_Id must be an entry or a subprogram. We should skip predefined
7087 -- primitives internally generated by the frontend; however at this
7088 -- stage predefined primitives are still not fully decorated. As a
7089 -- minor optimization we skip here internally generated subprograms.
7091 if (Ekind
(Def_Id
) /= E_Entry
7092 and then Ekind
(Def_Id
) /= E_Function
7093 and then Ekind
(Def_Id
) /= E_Procedure
)
7094 or else not Comes_From_Source
(Def_Id
)
7099 -- Search for the concurrent declaration since it contains the list
7100 -- of all implemented interfaces. In this case, the subprogram is
7101 -- declared within the scope of a protected or a task type.
7103 if Present
(Scope
(Def_Id
))
7104 and then Is_Concurrent_Type
(Scope
(Def_Id
))
7105 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
7107 Typ
:= Scope
(Def_Id
);
7110 -- The enclosing scope is not a synchronized type and the subprogram
7113 elsif No
(First_Formal
(Def_Id
)) then
7116 -- The subprogram has formals and hence it may be a primitive of a
7120 Typ
:= Etype
(First_Formal
(Def_Id
));
7122 if Is_Access_Type
(Typ
) then
7123 Typ
:= Directly_Designated_Type
(Typ
);
7126 if Is_Concurrent_Type
(Typ
)
7127 and then not Is_Generic_Actual_Type
(Typ
)
7131 -- This case occurs when the concurrent type is declared within
7132 -- a generic unit. As a result the corresponding record has been
7133 -- built and used as the type of the first formal, we just have
7134 -- to retrieve the corresponding concurrent type.
7136 elsif Is_Concurrent_Record_Type
(Typ
)
7137 and then Present
(Corresponding_Concurrent_Type
(Typ
))
7139 Typ
:= Corresponding_Concurrent_Type
(Typ
);
7147 -- There is no overriding to check if is an inherited operation in a
7148 -- type derivation on for a generic actual.
7150 Collect_Interfaces
(Typ
, Ifaces_List
);
7152 if Is_Empty_Elmt_List
(Ifaces_List
) then
7156 -- Determine whether entry or subprogram Def_Id overrides a primitive
7157 -- operation that belongs to one of the interfaces in Ifaces_List.
7160 Candidate
: Entity_Id
:= Empty
;
7161 Hom
: Entity_Id
:= Empty
;
7162 Iface_Typ
: Entity_Id
;
7163 Subp
: Entity_Id
:= Empty
;
7166 -- Traverse the homonym chain, looking at a potentially
7167 -- overridden subprogram that belongs to an implemented
7170 Hom
:= Current_Entity_In_Scope
(Def_Id
);
7171 while Present
(Hom
) loop
7175 or else not Is_Overloadable
(Subp
)
7176 or else not Is_Primitive
(Subp
)
7177 or else not Is_Dispatching_Operation
(Subp
)
7178 or else not Present
(Find_Dispatching_Type
(Subp
))
7179 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
7183 -- Entries and procedures can override abstract or null
7184 -- interface procedures
7186 elsif (Ekind
(Def_Id
) = E_Procedure
7187 or else Ekind
(Def_Id
) = E_Entry
)
7188 and then Ekind
(Subp
) = E_Procedure
7189 and then Matches_Prefixed_View_Profile
7190 (Parameter_Specifications
(Parent
(Def_Id
)),
7191 Parameter_Specifications
(Parent
(Subp
)))
7195 -- For an overridden subprogram Subp, check whether the mode
7196 -- of its first parameter is correct depending on the kind
7197 -- of synchronized type.
7200 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
7203 -- In order for an entry or a protected procedure to
7204 -- override, the first parameter of the overridden
7205 -- routine must be of mode "out", "in out" or
7206 -- access-to-variable.
7208 if (Ekind
(Candidate
) = E_Entry
7209 or else Ekind
(Candidate
) = E_Procedure
)
7210 and then Is_Protected_Type
(Typ
)
7211 and then Ekind
(Formal
) /= E_In_Out_Parameter
7212 and then Ekind
(Formal
) /= E_Out_Parameter
7213 and then Nkind
(Parameter_Type
(Parent
(Formal
)))
7214 /= N_Access_Definition
7218 -- All other cases are OK since a task entry or routine
7219 -- does not have a restriction on the mode of the first
7220 -- parameter of the overridden interface routine.
7223 Overridden_Subp
:= Candidate
;
7228 -- Functions can override abstract interface functions
7230 elsif Ekind
(Def_Id
) = E_Function
7231 and then Ekind
(Subp
) = E_Function
7232 and then Matches_Prefixed_View_Profile
7233 (Parameter_Specifications
(Parent
(Def_Id
)),
7234 Parameter_Specifications
(Parent
(Subp
)))
7235 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
7236 Etype
(Result_Definition
(Parent
(Subp
)))
7238 Overridden_Subp
:= Subp
;
7242 Hom
:= Homonym
(Hom
);
7245 -- After examining all candidates for overriding, we are
7246 -- left with the best match which is a mode incompatible
7247 -- interface routine. Do not emit an error if the Expander
7248 -- is active since this error will be detected later on
7249 -- after all concurrent types are expanded and all wrappers
7250 -- are built. This check is meant for spec-only
7253 if Present
(Candidate
)
7254 and then not Expander_Active
7257 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
7259 -- Def_Id is primitive of a protected type, declared
7260 -- inside the type, and the candidate is primitive of a
7261 -- limited or synchronized interface.
7264 and then Is_Protected_Type
(Typ
)
7266 (Is_Limited_Interface
(Iface_Typ
)
7267 or else Is_Protected_Interface
(Iface_Typ
)
7268 or else Is_Synchronized_Interface
(Iface_Typ
)
7269 or else Is_Task_Interface
(Iface_Typ
))
7271 -- Must reword this message, comma before to in -gnatj
7275 ("first formal of & must be of mode `OUT`, `IN OUT`"
7276 & " or access-to-variable", Typ
, Candidate
);
7278 ("\to be overridden by protected procedure or entry "
7279 & "(RM 9.4(11.9/2))", Typ
);
7283 Overridden_Subp
:= Candidate
;
7286 end Check_Synchronized_Overriding
;
7288 ----------------------------
7289 -- Is_Private_Declaration --
7290 ----------------------------
7292 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
7293 Priv_Decls
: List_Id
;
7294 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
7297 if Is_Package_Or_Generic_Package
(Current_Scope
)
7298 and then In_Private_Part
(Current_Scope
)
7301 Private_Declarations
(
7302 Specification
(Unit_Declaration_Node
(Current_Scope
)));
7304 return In_Package_Body
(Current_Scope
)
7306 (Is_List_Member
(Decl
)
7307 and then List_Containing
(Decl
) = Priv_Decls
)
7308 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
7311 (Defining_Entity
(Parent
(Decl
)))
7312 and then List_Containing
(Parent
(Parent
(Decl
)))
7317 end Is_Private_Declaration
;
7319 --------------------------
7320 -- Is_Overriding_Alias --
7321 --------------------------
7323 function Is_Overriding_Alias
7325 New_E
: Entity_Id
) return Boolean
7327 AO
: constant Entity_Id
:= Alias
(Old_E
);
7328 AN
: constant Entity_Id
:= Alias
(New_E
);
7331 return Scope
(AO
) /= Scope
(AN
)
7332 or else No
(DTC_Entity
(AO
))
7333 or else No
(DTC_Entity
(AN
))
7334 or else DT_Position
(AO
) = DT_Position
(AN
);
7335 end Is_Overriding_Alias
;
7337 -- Start of processing for New_Overloaded_Entity
7340 -- We need to look for an entity that S may override. This must be a
7341 -- homonym in the current scope, so we look for the first homonym of
7342 -- S in the current scope as the starting point for the search.
7344 E
:= Current_Entity_In_Scope
(S
);
7346 -- If there is no homonym then this is definitely not overriding
7349 Enter_Overloaded_Entity
(S
);
7350 Check_Dispatching_Operation
(S
, Empty
);
7351 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7353 -- If subprogram has an explicit declaration, check whether it
7354 -- has an overriding indicator.
7356 if Comes_From_Source
(S
) then
7357 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7358 Check_Overriding_Indicator
7359 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7362 -- If there is a homonym that is not overloadable, then we have an
7363 -- error, except for the special cases checked explicitly below.
7365 elsif not Is_Overloadable
(E
) then
7367 -- Check for spurious conflict produced by a subprogram that has the
7368 -- same name as that of the enclosing generic package. The conflict
7369 -- occurs within an instance, between the subprogram and the renaming
7370 -- declaration for the package. After the subprogram, the package
7371 -- renaming declaration becomes hidden.
7373 if Ekind
(E
) = E_Package
7374 and then Present
(Renamed_Object
(E
))
7375 and then Renamed_Object
(E
) = Current_Scope
7376 and then Nkind
(Parent
(Renamed_Object
(E
))) =
7377 N_Package_Specification
7378 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
7381 Set_Is_Immediately_Visible
(E
, False);
7382 Enter_Overloaded_Entity
(S
);
7383 Set_Homonym
(S
, Homonym
(E
));
7384 Check_Dispatching_Operation
(S
, Empty
);
7385 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
7387 -- If the subprogram is implicit it is hidden by the previous
7388 -- declaration. However if it is dispatching, it must appear in the
7389 -- dispatch table anyway, because it can be dispatched to even if it
7390 -- cannot be called directly.
7392 elsif Present
(Alias
(S
))
7393 and then not Comes_From_Source
(S
)
7395 Set_Scope
(S
, Current_Scope
);
7397 if Is_Dispatching_Operation
(Alias
(S
)) then
7398 Check_Dispatching_Operation
(S
, Empty
);
7404 Error_Msg_Sloc
:= Sloc
(E
);
7406 -- Generate message, with useful additional warning if in generic
7408 if Is_Generic_Unit
(E
) then
7409 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
7410 Error_Msg_N
("\& conflicts with declaration#", S
);
7412 Error_Msg_N
("& conflicts with declaration#", S
);
7418 -- E exists and is overloadable
7421 -- Ada 2005 (AI-251): Derivation of abstract interface primitives
7422 -- need no check against the homonym chain. They are directly added
7423 -- to the list of primitive operations of Derived_Type.
7425 if Ada_Version
>= Ada_05
7426 and then Present
(Derived_Type
)
7427 and then Is_Dispatching_Operation
(Alias
(S
))
7428 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
7429 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
7431 goto Add_New_Entity
;
7434 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7436 -- Loop through E and its homonyms to determine if any of them is
7437 -- the candidate for overriding by S.
7439 while Present
(E
) loop
7441 -- Definitely not interesting if not in the current scope
7443 if Scope
(E
) /= Current_Scope
then
7446 -- Check if we have type conformance
7448 elsif Type_Conformant
(E
, S
) then
7450 -- If the old and new entities have the same profile and one
7451 -- is not the body of the other, then this is an error, unless
7452 -- one of them is implicitly declared.
7454 -- There are some cases when both can be implicit, for example
7455 -- when both a literal and a function that overrides it are
7456 -- inherited in a derivation, or when an inherited operation
7457 -- of a tagged full type overrides the inherited operation of
7458 -- a private extension. Ada 83 had a special rule for the
7459 -- literal case. In Ada95, the later implicit operation hides
7460 -- the former, and the literal is always the former. In the
7461 -- odd case where both are derived operations declared at the
7462 -- same point, both operations should be declared, and in that
7463 -- case we bypass the following test and proceed to the next
7464 -- part. This can only occur for certain obscure cases in
7465 -- instances, when an operation on a type derived from a formal
7466 -- private type does not override a homograph inherited from
7467 -- the actual. In subsequent derivations of such a type, the
7468 -- DT positions of these operations remain distinct, if they
7471 if Present
(Alias
(S
))
7472 and then (No
(Alias
(E
))
7473 or else Comes_From_Source
(E
)
7474 or else Is_Abstract_Subprogram
(S
)
7476 (Is_Dispatching_Operation
(E
)
7477 and then Is_Overriding_Alias
(E
, S
)))
7478 and then Ekind
(E
) /= E_Enumeration_Literal
7480 -- When an derived operation is overloaded it may be due to
7481 -- the fact that the full view of a private extension
7482 -- re-inherits. It has to be dealt with.
7484 if Is_Package_Or_Generic_Package
(Current_Scope
)
7485 and then In_Private_Part
(Current_Scope
)
7487 Check_Operation_From_Private_View
(S
, E
);
7490 -- In any case the implicit operation remains hidden by
7491 -- the existing declaration, which is overriding.
7493 Set_Is_Overriding_Operation
(E
);
7495 if Comes_From_Source
(E
) then
7496 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
7498 -- Indicate that E overrides the operation from which
7501 if Present
(Alias
(S
)) then
7502 Set_Overridden_Operation
(E
, Alias
(S
));
7504 Set_Overridden_Operation
(E
, S
);
7510 -- Within an instance, the renaming declarations for actual
7511 -- subprograms may become ambiguous, but they do not hide each
7514 elsif Ekind
(E
) /= E_Entry
7515 and then not Comes_From_Source
(E
)
7516 and then not Is_Generic_Instance
(E
)
7517 and then (Present
(Alias
(E
))
7518 or else Is_Intrinsic_Subprogram
(E
))
7519 and then (not In_Instance
7520 or else No
(Parent
(E
))
7521 or else Nkind
(Unit_Declaration_Node
(E
)) /=
7522 N_Subprogram_Renaming_Declaration
)
7524 -- A subprogram child unit is not allowed to override an
7525 -- inherited subprogram (10.1.1(20)).
7527 if Is_Child_Unit
(S
) then
7529 ("child unit overrides inherited subprogram in parent",
7534 if Is_Non_Overriding_Operation
(E
, S
) then
7535 Enter_Overloaded_Entity
(S
);
7537 if No
(Derived_Type
)
7538 or else Is_Tagged_Type
(Derived_Type
)
7540 Check_Dispatching_Operation
(S
, Empty
);
7546 -- E is a derived operation or an internal operator which
7547 -- is being overridden. Remove E from further visibility.
7548 -- Furthermore, if E is a dispatching operation, it must be
7549 -- replaced in the list of primitive operations of its type
7550 -- (see Override_Dispatching_Operation).
7552 Overridden_Subp
:= E
;
7558 Prev
:= First_Entity
(Current_Scope
);
7559 while Present
(Prev
)
7560 and then Next_Entity
(Prev
) /= E
7565 -- It is possible for E to be in the current scope and
7566 -- yet not in the entity chain. This can only occur in a
7567 -- generic context where E is an implicit concatenation
7568 -- in the formal part, because in a generic body the
7569 -- entity chain starts with the formals.
7572 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
7574 -- E must be removed both from the entity_list of the
7575 -- current scope, and from the visibility chain
7577 if Debug_Flag_E
then
7578 Write_Str
("Override implicit operation ");
7579 Write_Int
(Int
(E
));
7583 -- If E is a predefined concatenation, it stands for four
7584 -- different operations. As a result, a single explicit
7585 -- declaration does not hide it. In a possible ambiguous
7586 -- situation, Disambiguate chooses the user-defined op,
7587 -- so it is correct to retain the previous internal one.
7589 if Chars
(E
) /= Name_Op_Concat
7590 or else Ekind
(E
) /= E_Operator
7592 -- For nondispatching derived operations that are
7593 -- overridden by a subprogram declared in the private
7594 -- part of a package, we retain the derived subprogram
7595 -- but mark it as not immediately visible. If the
7596 -- derived operation was declared in the visible part
7597 -- then this ensures that it will still be visible
7598 -- outside the package with the proper signature
7599 -- (calls from outside must also be directed to this
7600 -- version rather than the overriding one, unlike the
7601 -- dispatching case). Calls from inside the package
7602 -- will still resolve to the overriding subprogram
7603 -- since the derived one is marked as not visible
7604 -- within the package.
7606 -- If the private operation is dispatching, we achieve
7607 -- the overriding by keeping the implicit operation
7608 -- but setting its alias to be the overriding one. In
7609 -- this fashion the proper body is executed in all
7610 -- cases, but the original signature is used outside
7613 -- If the overriding is not in the private part, we
7614 -- remove the implicit operation altogether.
7616 if Is_Private_Declaration
(S
) then
7617 if not Is_Dispatching_Operation
(E
) then
7618 Set_Is_Immediately_Visible
(E
, False);
7620 -- Work done in Override_Dispatching_Operation,
7621 -- so nothing else need to be done here.
7627 -- Find predecessor of E in Homonym chain
7629 if E
= Current_Entity
(E
) then
7632 Prev_Vis
:= Current_Entity
(E
);
7633 while Homonym
(Prev_Vis
) /= E
loop
7634 Prev_Vis
:= Homonym
(Prev_Vis
);
7638 if Prev_Vis
/= Empty
then
7640 -- Skip E in the visibility chain
7642 Set_Homonym
(Prev_Vis
, Homonym
(E
));
7645 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7648 Set_Next_Entity
(Prev
, Next_Entity
(E
));
7650 if No
(Next_Entity
(Prev
)) then
7651 Set_Last_Entity
(Current_Scope
, Prev
);
7657 Enter_Overloaded_Entity
(S
);
7658 Set_Is_Overriding_Operation
(S
);
7659 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
7661 -- Indicate that S overrides the operation from which
7664 if Comes_From_Source
(S
) then
7665 if Present
(Alias
(E
)) then
7666 Set_Overridden_Operation
(S
, Alias
(E
));
7668 Set_Overridden_Operation
(S
, E
);
7672 if Is_Dispatching_Operation
(E
) then
7674 -- An overriding dispatching subprogram inherits the
7675 -- convention of the overridden subprogram (by
7678 Set_Convention
(S
, Convention
(E
));
7679 Check_Dispatching_Operation
(S
, E
);
7682 Check_Dispatching_Operation
(S
, Empty
);
7685 Check_For_Primitive_Subprogram
7686 (Is_Primitive_Subp
, Is_Overriding
=> True);
7687 goto Check_Inequality
;
7690 -- Apparent redeclarations in instances can occur when two
7691 -- formal types get the same actual type. The subprograms in
7692 -- in the instance are legal, even if not callable from the
7693 -- outside. Calls from within are disambiguated elsewhere.
7694 -- For dispatching operations in the visible part, the usual
7695 -- rules apply, and operations with the same profile are not
7698 elsif (In_Instance_Visible_Part
7699 and then not Is_Dispatching_Operation
(E
))
7700 or else In_Instance_Not_Visible
7704 -- Here we have a real error (identical profile)
7707 Error_Msg_Sloc
:= Sloc
(E
);
7709 -- Avoid cascaded errors if the entity appears in
7710 -- subsequent calls.
7712 Set_Scope
(S
, Current_Scope
);
7714 -- Generate error, with extra useful warning for the case
7715 -- of a generic instance with no completion.
7717 if Is_Generic_Instance
(S
)
7718 and then not Has_Completion
(E
)
7721 ("instantiation cannot provide body for&", S
);
7722 Error_Msg_N
("\& conflicts with declaration#", S
);
7724 Error_Msg_N
("& conflicts with declaration#", S
);
7731 -- If one subprogram has an access parameter and the other
7732 -- a parameter of an access type, calls to either might be
7733 -- ambiguous. Verify that parameters match except for the
7734 -- access parameter.
7736 if May_Hide_Profile
then
7742 F1
:= First_Formal
(S
);
7743 F2
:= First_Formal
(E
);
7744 while Present
(F1
) and then Present
(F2
) loop
7745 if Is_Access_Type
(Etype
(F1
)) then
7746 if not Is_Access_Type
(Etype
(F2
))
7747 or else not Conforming_Types
7748 (Designated_Type
(Etype
(F1
)),
7749 Designated_Type
(Etype
(F2
)),
7752 May_Hide_Profile
:= False;
7756 not Conforming_Types
7757 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
7759 May_Hide_Profile
:= False;
7770 Error_Msg_NE
("calls to& may be ambiguous?", S
, S
);
7781 -- On exit, we know that S is a new entity
7783 Enter_Overloaded_Entity
(S
);
7784 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7785 Check_Overriding_Indicator
7786 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7788 -- If S is a derived operation for an untagged type then by
7789 -- definition it's not a dispatching operation (even if the parent
7790 -- operation was dispatching), so we don't call
7791 -- Check_Dispatching_Operation in that case.
7793 if No
(Derived_Type
)
7794 or else Is_Tagged_Type
(Derived_Type
)
7796 Check_Dispatching_Operation
(S
, Empty
);
7800 -- If this is a user-defined equality operator that is not a derived
7801 -- subprogram, create the corresponding inequality. If the operation is
7802 -- dispatching, the expansion is done elsewhere, and we do not create
7803 -- an explicit inequality operation.
7805 <<Check_Inequality
>>
7806 if Chars
(S
) = Name_Op_Eq
7807 and then Etype
(S
) = Standard_Boolean
7808 and then Present
(Parent
(S
))
7809 and then not Is_Dispatching_Operation
(S
)
7811 Make_Inequality_Operator
(S
);
7813 end New_Overloaded_Entity
;
7815 ---------------------
7816 -- Process_Formals --
7817 ---------------------
7819 procedure Process_Formals
7821 Related_Nod
: Node_Id
)
7823 Param_Spec
: Node_Id
;
7825 Formal_Type
: Entity_Id
;
7829 Num_Out_Params
: Nat
:= 0;
7830 First_Out_Param
: Entity_Id
:= Empty
;
7831 -- Used for setting Is_Only_Out_Parameter
7833 function Designates_From_With_Type
(Typ
: Entity_Id
) return Boolean;
7834 -- Determine whether an access type designates a type coming from a
7837 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
7838 -- Check whether the default has a class-wide type. After analysis the
7839 -- default has the type of the formal, so we must also check explicitly
7840 -- for an access attribute.
7842 -------------------------------
7843 -- Designates_From_With_Type --
7844 -------------------------------
7846 function Designates_From_With_Type
(Typ
: Entity_Id
) return Boolean is
7847 Desig
: Entity_Id
:= Typ
;
7850 if Is_Access_Type
(Desig
) then
7851 Desig
:= Directly_Designated_Type
(Desig
);
7854 if Is_Class_Wide_Type
(Desig
) then
7855 Desig
:= Root_Type
(Desig
);
7859 Ekind
(Desig
) = E_Incomplete_Type
7860 and then From_With_Type
(Desig
);
7861 end Designates_From_With_Type
;
7863 ---------------------------
7864 -- Is_Class_Wide_Default --
7865 ---------------------------
7867 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
7869 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
7870 or else (Nkind
(D
) = N_Attribute_Reference
7871 and then Attribute_Name
(D
) = Name_Access
7872 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
7873 end Is_Class_Wide_Default
;
7875 -- Start of processing for Process_Formals
7878 -- In order to prevent premature use of the formals in the same formal
7879 -- part, the Ekind is left undefined until all default expressions are
7880 -- analyzed. The Ekind is established in a separate loop at the end.
7882 Param_Spec
:= First
(T
);
7883 while Present
(Param_Spec
) loop
7884 Formal
:= Defining_Identifier
(Param_Spec
);
7885 Set_Never_Set_In_Source
(Formal
, True);
7886 Enter_Name
(Formal
);
7888 -- Case of ordinary parameters
7890 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
7891 Find_Type
(Parameter_Type
(Param_Spec
));
7892 Ptype
:= Parameter_Type
(Param_Spec
);
7894 if Ptype
= Error
then
7898 Formal_Type
:= Entity
(Ptype
);
7900 if Is_Incomplete_Type
(Formal_Type
)
7902 (Is_Class_Wide_Type
(Formal_Type
)
7903 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
7905 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
7906 -- primitive operations, as long as their completion is
7907 -- in the same declarative part. If in the private part
7908 -- this means that the type cannot be a Taft-amendment type.
7909 -- Check is done on package exit. For access to subprograms,
7910 -- the use is legal for Taft-amendment types.
7912 if Is_Tagged_Type
(Formal_Type
) then
7913 if Ekind
(Scope
(Current_Scope
)) = E_Package
7914 and then In_Private_Part
(Scope
(Current_Scope
))
7915 and then not From_With_Type
(Formal_Type
)
7916 and then not Is_Class_Wide_Type
(Formal_Type
)
7919 (Parent
(T
), N_Access_Function_Definition
,
7920 N_Access_Procedure_Definition
)
7924 Private_Dependents
(Base_Type
(Formal_Type
)));
7928 -- Special handling of Value_Type for CIL case
7930 elsif Is_Value_Type
(Formal_Type
) then
7933 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
7934 N_Access_Procedure_Definition
)
7937 ("invalid use of incomplete type&",
7938 Param_Spec
, Formal_Type
);
7940 -- Further checks on the legality of incomplete types
7941 -- in formal parts must be delayed until the freeze point
7942 -- of the enclosing subprogram or access to subprogram.
7945 elsif Ekind
(Formal_Type
) = E_Void
then
7946 Error_Msg_NE
("premature use of&",
7947 Parameter_Type
(Param_Spec
), Formal_Type
);
7950 -- Ada 2005 (AI-231): Create and decorate an internal subtype
7951 -- declaration corresponding to the null-excluding type of the
7952 -- formal in the enclosing scope. Finally, replace the parameter
7953 -- type of the formal with the internal subtype.
7955 if Ada_Version
>= Ada_05
7956 and then Null_Exclusion_Present
(Param_Spec
)
7958 if not Is_Access_Type
(Formal_Type
) then
7960 ("`NOT NULL` allowed only for an access type", Param_Spec
);
7963 if Can_Never_Be_Null
(Formal_Type
)
7964 and then Comes_From_Source
(Related_Nod
)
7967 ("`NOT NULL` not allowed (& already excludes null)",
7973 Create_Null_Excluding_Itype
7975 Related_Nod
=> Related_Nod
,
7976 Scope_Id
=> Scope
(Current_Scope
));
7978 -- If the designated type of the itype is an itype we
7979 -- decorate it with the Has_Delayed_Freeze attribute to
7980 -- avoid problems with the backend.
7983 -- type T is access procedure;
7984 -- procedure Op (O : not null T);
7986 if Is_Itype
(Directly_Designated_Type
(Formal_Type
)) then
7987 Set_Has_Delayed_Freeze
(Formal_Type
);
7992 -- An access formal type
7996 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
7998 -- No need to continue if we already notified errors
8000 if not Present
(Formal_Type
) then
8004 -- Ada 2005 (AI-254)
8007 AD
: constant Node_Id
:=
8008 Access_To_Subprogram_Definition
8009 (Parameter_Type
(Param_Spec
));
8011 if Present
(AD
) and then Protected_Present
(AD
) then
8013 Replace_Anonymous_Access_To_Protected_Subprogram
8019 Set_Etype
(Formal
, Formal_Type
);
8020 Default
:= Expression
(Param_Spec
);
8022 if Present
(Default
) then
8023 if Out_Present
(Param_Spec
) then
8025 ("default initialization only allowed for IN parameters",
8029 -- Do the special preanalysis of the expression (see section on
8030 -- "Handling of Default Expressions" in the spec of package Sem).
8032 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
8034 -- An access to constant cannot be the default for
8035 -- an access parameter that is an access to variable.
8037 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
8038 and then not Is_Access_Constant
(Formal_Type
)
8039 and then Is_Access_Type
(Etype
(Default
))
8040 and then Is_Access_Constant
(Etype
(Default
))
8043 ("formal that is access to variable cannot be initialized " &
8044 "with an access-to-constant expression", Default
);
8047 -- Check that the designated type of an access parameter's default
8048 -- is not a class-wide type unless the parameter's designated type
8049 -- is also class-wide.
8051 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
8052 and then not Designates_From_With_Type
(Formal_Type
)
8053 and then Is_Class_Wide_Default
(Default
)
8054 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
8057 ("access to class-wide expression not allowed here", Default
);
8061 -- Ada 2005 (AI-231): Static checks
8063 if Ada_Version
>= Ada_05
8064 and then Is_Access_Type
(Etype
(Formal
))
8065 and then Can_Never_Be_Null
(Etype
(Formal
))
8067 Null_Exclusion_Static_Checks
(Param_Spec
);
8074 -- If this is the formal part of a function specification, analyze the
8075 -- subtype mark in the context where the formals are visible but not
8076 -- yet usable, and may hide outer homographs.
8078 if Nkind
(Related_Nod
) = N_Function_Specification
then
8079 Analyze_Return_Type
(Related_Nod
);
8082 -- Now set the kind (mode) of each formal
8084 Param_Spec
:= First
(T
);
8086 while Present
(Param_Spec
) loop
8087 Formal
:= Defining_Identifier
(Param_Spec
);
8088 Set_Formal_Mode
(Formal
);
8090 if Ekind
(Formal
) = E_In_Parameter
then
8091 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
8093 if Present
(Expression
(Param_Spec
)) then
8094 Default
:= Expression
(Param_Spec
);
8096 if Is_Scalar_Type
(Etype
(Default
)) then
8098 (Parameter_Type
(Param_Spec
)) /= N_Access_Definition
8100 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
8103 Formal_Type
:= Access_Definition
8104 (Related_Nod
, Parameter_Type
(Param_Spec
));
8107 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
8111 elsif Ekind
(Formal
) = E_Out_Parameter
then
8112 Num_Out_Params
:= Num_Out_Params
+ 1;
8114 if Num_Out_Params
= 1 then
8115 First_Out_Param
:= Formal
;
8118 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
8119 Num_Out_Params
:= Num_Out_Params
+ 1;
8125 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
8126 Set_Is_Only_Out_Parameter
(First_Out_Param
);
8128 end Process_Formals
;
8134 procedure Process_PPCs
8136 Spec_Id
: Entity_Id
;
8137 Body_Id
: Entity_Id
)
8139 Loc
: constant Source_Ptr
:= Sloc
(N
);
8141 Plist
: List_Id
:= No_List
;
8145 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
;
8146 -- Prag contains an analyzed precondition or postcondition pragma.
8147 -- This function copies the pragma, changes it to the corresponding
8148 -- Check pragma and returns the Check pragma as the result. The
8149 -- argument Nam is either Name_Precondition or Name_Postcondition.
8155 function Grab_PPC
(Nam
: Name_Id
) return Node_Id
is
8156 CP
: constant Node_Id
:= New_Copy_Tree
(Prag
);
8159 -- Set Analyzed to false, since we want to reanalyze the check
8160 -- procedure. Note that it is only at the outer level that we
8161 -- do this fiddling, for the spec cases, the already preanalyzed
8162 -- parameters are not affected.
8164 -- For a postcondition pragma within a generic, preserve the pragma
8165 -- for later expansion.
8167 Set_Analyzed
(CP
, False);
8169 if Nam
= Name_Postcondition
8170 and then not Expander_Active
8175 -- Change pragma into corresponding pragma Check
8177 Prepend_To
(Pragma_Argument_Associations
(CP
),
8178 Make_Pragma_Argument_Association
(Sloc
(Prag
),
8180 Make_Identifier
(Loc
,
8182 Set_Pragma_Identifier
(CP
,
8183 Make_Identifier
(Sloc
(Prag
),
8184 Chars
=> Name_Check
));
8189 -- Start of processing for Process_PPCs
8192 -- Nothing to do if we are not generating code
8194 if Operating_Mode
/= Generate_Code
then
8198 -- Grab preconditions from spec
8200 if Present
(Spec_Id
) then
8202 -- Loop through PPC pragmas from spec. Note that preconditions from
8203 -- the body will be analyzed and converted when we scan the body
8204 -- declarations below.
8206 Prag
:= Spec_PPC_List
(Spec_Id
);
8207 while Present
(Prag
) loop
8208 if Pragma_Name
(Prag
) = Name_Precondition
8209 and then PPC_Enabled
(Prag
)
8211 -- Add pragma Check at the start of the declarations of N.
8212 -- Note that this processing reverses the order of the list,
8213 -- which is what we want since new entries were chained to
8214 -- the head of the list.
8216 Prepend
(Grab_PPC
(Name_Precondition
), Declarations
(N
));
8219 Prag
:= Next_Pragma
(Prag
);
8223 -- Build postconditions procedure if needed and prepend the following
8224 -- declaration to the start of the declarations for the subprogram.
8226 -- procedure _postconditions [(_Result : resulttype)] is
8228 -- pragma Check (Postcondition, condition [,message]);
8229 -- pragma Check (Postcondition, condition [,message]);
8233 -- First we deal with the postconditions in the body
8235 if Is_Non_Empty_List
(Declarations
(N
)) then
8237 -- Loop through declarations
8239 Prag
:= First
(Declarations
(N
));
8240 while Present
(Prag
) loop
8241 if Nkind
(Prag
) = N_Pragma
then
8243 -- If pragma, capture if enabled postcondition, else ignore
8245 if Pragma_Name
(Prag
) = Name_Postcondition
8246 and then Check_Enabled
(Name_Postcondition
)
8248 if Plist
= No_List
then
8249 Plist
:= Empty_List
;
8254 -- If expansion is disabled, as in a generic unit,
8255 -- save pragma for later expansion.
8257 if not Expander_Active
then
8258 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
8260 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
8266 -- Not a pragma, if comes from source, then end scan
8268 elsif Comes_From_Source
(Prag
) then
8271 -- Skip stuff not coming from source
8279 -- Now deal with any postconditions from the spec
8281 if Present
(Spec_Id
) then
8283 -- Loop through PPC pragmas from spec
8285 Prag
:= Spec_PPC_List
(Spec_Id
);
8286 while Present
(Prag
) loop
8287 if Pragma_Name
(Prag
) = Name_Postcondition
8288 and then PPC_Enabled
(Prag
)
8290 if Plist
= No_List
then
8291 Plist
:= Empty_List
;
8294 if not Expander_Active
then
8295 Prepend
(Grab_PPC
(Name_Postcondition
), Declarations
(N
));
8297 Append
(Grab_PPC
(Name_Postcondition
), Plist
);
8301 Prag
:= Next_Pragma
(Prag
);
8305 -- If we had any postconditions and expansion is enabled, build
8306 -- the _Postconditions procedure.
8309 and then Expander_Active
8311 Subp
:= Defining_Entity
(N
);
8313 if Etype
(Subp
) /= Standard_Void_Type
then
8315 Make_Parameter_Specification
(Loc
,
8316 Defining_Identifier
=>
8317 Make_Defining_Identifier
(Loc
,
8318 Chars
=> Name_uResult
),
8319 Parameter_Type
=> New_Occurrence_Of
(Etype
(Subp
), Loc
)));
8325 Post_Proc
: constant Entity_Id
:=
8326 Make_Defining_Identifier
(Loc
,
8327 Chars
=> Name_uPostconditions
);
8328 -- The entity for the _Postconditions procedure
8330 Prepend_To
(Declarations
(N
),
8331 Make_Subprogram_Body
(Loc
,
8333 Make_Procedure_Specification
(Loc
,
8334 Defining_Unit_Name
=> Post_Proc
,
8335 Parameter_Specifications
=> Parms
),
8337 Declarations
=> Empty_List
,
8339 Handled_Statement_Sequence
=>
8340 Make_Handled_Sequence_Of_Statements
(Loc
,
8341 Statements
=> Plist
)));
8343 -- If this is a procedure, set the Postcondition_Proc attribute
8345 if Etype
(Subp
) = Standard_Void_Type
then
8346 Set_Postcondition_Proc
(Spec_Id
, Post_Proc
);
8350 if Present
(Spec_Id
) then
8351 Set_Has_Postconditions
(Spec_Id
);
8353 Set_Has_Postconditions
(Body_Id
);
8358 ----------------------------
8359 -- Reference_Body_Formals --
8360 ----------------------------
8362 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
8367 if Error_Posted
(Spec
) then
8371 -- Iterate over both lists. They may be of different lengths if the two
8372 -- specs are not conformant.
8374 Fs
:= First_Formal
(Spec
);
8375 Fb
:= First_Formal
(Bod
);
8376 while Present
(Fs
) and then Present
(Fb
) loop
8377 Generate_Reference
(Fs
, Fb
, 'b');
8380 Style
.Check_Identifier
(Fb
, Fs
);
8383 Set_Spec_Entity
(Fb
, Fs
);
8384 Set_Referenced
(Fs
, False);
8388 end Reference_Body_Formals
;
8390 -------------------------
8391 -- Set_Actual_Subtypes --
8392 -------------------------
8394 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
8395 Loc
: constant Source_Ptr
:= Sloc
(N
);
8399 First_Stmt
: Node_Id
:= Empty
;
8400 AS_Needed
: Boolean;
8403 -- If this is an empty initialization procedure, no need to create
8404 -- actual subtypes (small optimization).
8406 if Ekind
(Subp
) = E_Procedure
8407 and then Is_Null_Init_Proc
(Subp
)
8412 Formal
:= First_Formal
(Subp
);
8413 while Present
(Formal
) loop
8414 T
:= Etype
(Formal
);
8416 -- We never need an actual subtype for a constrained formal
8418 if Is_Constrained
(T
) then
8421 -- If we have unknown discriminants, then we do not need an actual
8422 -- subtype, or more accurately we cannot figure it out! Note that
8423 -- all class-wide types have unknown discriminants.
8425 elsif Has_Unknown_Discriminants
(T
) then
8428 -- At this stage we have an unconstrained type that may need an
8429 -- actual subtype. For sure the actual subtype is needed if we have
8430 -- an unconstrained array type.
8432 elsif Is_Array_Type
(T
) then
8435 -- The only other case needing an actual subtype is an unconstrained
8436 -- record type which is an IN parameter (we cannot generate actual
8437 -- subtypes for the OUT or IN OUT case, since an assignment can
8438 -- change the discriminant values. However we exclude the case of
8439 -- initialization procedures, since discriminants are handled very
8440 -- specially in this context, see the section entitled "Handling of
8441 -- Discriminants" in Einfo.
8443 -- We also exclude the case of Discrim_SO_Functions (functions used
8444 -- in front end layout mode for size/offset values), since in such
8445 -- functions only discriminants are referenced, and not only are such
8446 -- subtypes not needed, but they cannot always be generated, because
8447 -- of order of elaboration issues.
8449 elsif Is_Record_Type
(T
)
8450 and then Ekind
(Formal
) = E_In_Parameter
8451 and then Chars
(Formal
) /= Name_uInit
8452 and then not Is_Unchecked_Union
(T
)
8453 and then not Is_Discrim_SO_Function
(Subp
)
8457 -- All other cases do not need an actual subtype
8463 -- Generate actual subtypes for unconstrained arrays and
8464 -- unconstrained discriminated records.
8467 if Nkind
(N
) = N_Accept_Statement
then
8469 -- If expansion is active, The formal is replaced by a local
8470 -- variable that renames the corresponding entry of the
8471 -- parameter block, and it is this local variable that may
8472 -- require an actual subtype.
8474 if Expander_Active
then
8475 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
8477 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8480 if Present
(Handled_Statement_Sequence
(N
)) then
8482 First
(Statements
(Handled_Statement_Sequence
(N
)));
8483 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
8484 Mark_Rewrite_Insertion
(Decl
);
8486 -- If the accept statement has no body, there will be no
8487 -- reference to the actuals, so no need to compute actual
8494 Decl
:= Build_Actual_Subtype
(T
, Formal
);
8495 Prepend
(Decl
, Declarations
(N
));
8496 Mark_Rewrite_Insertion
(Decl
);
8499 -- The declaration uses the bounds of an existing object, and
8500 -- therefore needs no constraint checks.
8502 Analyze
(Decl
, Suppress
=> All_Checks
);
8504 -- We need to freeze manually the generated type when it is
8505 -- inserted anywhere else than in a declarative part.
8507 if Present
(First_Stmt
) then
8508 Insert_List_Before_And_Analyze
(First_Stmt
,
8509 Freeze_Entity
(Defining_Identifier
(Decl
), Loc
));
8512 if Nkind
(N
) = N_Accept_Statement
8513 and then Expander_Active
8515 Set_Actual_Subtype
(Renamed_Object
(Formal
),
8516 Defining_Identifier
(Decl
));
8518 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
8522 Next_Formal
(Formal
);
8524 end Set_Actual_Subtypes
;
8526 ---------------------
8527 -- Set_Formal_Mode --
8528 ---------------------
8530 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
8531 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
8534 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
8535 -- since we ensure that corresponding actuals are always valid at the
8536 -- point of the call.
8538 if Out_Present
(Spec
) then
8539 if Ekind
(Scope
(Formal_Id
)) = E_Function
8540 or else Ekind
(Scope
(Formal_Id
)) = E_Generic_Function
8542 Error_Msg_N
("functions can only have IN parameters", Spec
);
8543 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8545 elsif In_Present
(Spec
) then
8546 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
8549 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
8550 Set_Never_Set_In_Source
(Formal_Id
, True);
8551 Set_Is_True_Constant
(Formal_Id
, False);
8552 Set_Current_Value
(Formal_Id
, Empty
);
8556 Set_Ekind
(Formal_Id
, E_In_Parameter
);
8559 -- Set Is_Known_Non_Null for access parameters since the language
8560 -- guarantees that access parameters are always non-null. We also set
8561 -- Can_Never_Be_Null, since there is no way to change the value.
8563 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
8565 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
8566 -- null; In Ada 2005, only if then null_exclusion is explicit.
8568 if Ada_Version
< Ada_05
8569 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
8571 Set_Is_Known_Non_Null
(Formal_Id
);
8572 Set_Can_Never_Be_Null
(Formal_Id
);
8575 -- Ada 2005 (AI-231): Null-exclusion access subtype
8577 elsif Is_Access_Type
(Etype
(Formal_Id
))
8578 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
8580 Set_Is_Known_Non_Null
(Formal_Id
);
8583 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
8584 Set_Formal_Validity
(Formal_Id
);
8585 end Set_Formal_Mode
;
8587 -------------------------
8588 -- Set_Formal_Validity --
8589 -------------------------
8591 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
8593 -- If no validity checking, then we cannot assume anything about the
8594 -- validity of parameters, since we do not know there is any checking
8595 -- of the validity on the call side.
8597 if not Validity_Checks_On
then
8600 -- If validity checking for parameters is enabled, this means we are
8601 -- not supposed to make any assumptions about argument values.
8603 elsif Validity_Check_Parameters
then
8606 -- If we are checking in parameters, we will assume that the caller is
8607 -- also checking parameters, so we can assume the parameter is valid.
8609 elsif Ekind
(Formal_Id
) = E_In_Parameter
8610 and then Validity_Check_In_Params
8612 Set_Is_Known_Valid
(Formal_Id
, True);
8614 -- Similar treatment for IN OUT parameters
8616 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
8617 and then Validity_Check_In_Out_Params
8619 Set_Is_Known_Valid
(Formal_Id
, True);
8621 end Set_Formal_Validity
;
8623 ------------------------
8624 -- Subtype_Conformant --
8625 ------------------------
8627 function Subtype_Conformant
8628 (New_Id
: Entity_Id
;
8630 Skip_Controlling_Formals
: Boolean := False) return Boolean
8634 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
8635 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8637 end Subtype_Conformant
;
8639 ---------------------
8640 -- Type_Conformant --
8641 ---------------------
8643 function Type_Conformant
8644 (New_Id
: Entity_Id
;
8646 Skip_Controlling_Formals
: Boolean := False) return Boolean
8650 May_Hide_Profile
:= False;
8653 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
8654 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
8656 end Type_Conformant
;
8658 -------------------------------
8659 -- Valid_Operator_Definition --
8660 -------------------------------
8662 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
8665 Id
: constant Name_Id
:= Chars
(Designator
);
8669 F
:= First_Formal
(Designator
);
8670 while Present
(F
) loop
8673 if Present
(Default_Value
(F
)) then
8675 ("default values not allowed for operator parameters",
8682 -- Verify that user-defined operators have proper number of arguments
8683 -- First case of operators which can only be unary
8686 or else Id
= Name_Op_Abs
8690 -- Case of operators which can be unary or binary
8692 elsif Id
= Name_Op_Add
8693 or Id
= Name_Op_Subtract
8695 N_OK
:= (N
in 1 .. 2);
8697 -- All other operators can only be binary
8705 ("incorrect number of arguments for operator", Designator
);
8709 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
8710 and then not Is_Intrinsic_Subprogram
(Designator
)
8713 ("explicit definition of inequality not allowed", Designator
);
8715 end Valid_Operator_Definition
;