1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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 Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Debug
; use Debug
;
30 with Einfo
; use Einfo
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
33 with Expander
; use Expander
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Dbug
; use Exp_Dbug
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Tss
; use Exp_Tss
;
40 with Exp_Util
; use Exp_Util
;
41 with Fname
; use Fname
;
42 with Freeze
; use Freeze
;
43 with Ghost
; use Ghost
;
44 with Inline
; use Inline
;
45 with Itypes
; use Itypes
;
46 with Lib
.Xref
; use Lib
.Xref
;
47 with Layout
; use Layout
;
48 with Namet
; use Namet
;
50 with Nlists
; use Nlists
;
51 with Nmake
; use Nmake
;
53 with Output
; use Output
;
54 with Restrict
; use Restrict
;
55 with Rident
; use Rident
;
56 with Rtsfind
; use Rtsfind
;
58 with Sem_Aux
; use Sem_Aux
;
59 with Sem_Cat
; use Sem_Cat
;
60 with Sem_Ch3
; use Sem_Ch3
;
61 with Sem_Ch4
; use Sem_Ch4
;
62 with Sem_Ch5
; use Sem_Ch5
;
63 with Sem_Ch8
; use Sem_Ch8
;
64 with Sem_Ch10
; use Sem_Ch10
;
65 with Sem_Ch12
; use Sem_Ch12
;
66 with Sem_Ch13
; use Sem_Ch13
;
67 with Sem_Dim
; use Sem_Dim
;
68 with Sem_Disp
; use Sem_Disp
;
69 with Sem_Dist
; use Sem_Dist
;
70 with Sem_Elim
; use Sem_Elim
;
71 with Sem_Eval
; use Sem_Eval
;
72 with Sem_Mech
; use Sem_Mech
;
73 with Sem_Prag
; use Sem_Prag
;
74 with Sem_Res
; use Sem_Res
;
75 with Sem_Util
; use Sem_Util
;
76 with Sem_Type
; use Sem_Type
;
77 with Sem_Warn
; use Sem_Warn
;
78 with Sinput
; use Sinput
;
79 with Stand
; use Stand
;
80 with Sinfo
; use Sinfo
;
81 with Sinfo
.CN
; use Sinfo
.CN
;
82 with Snames
; use Snames
;
83 with Stringt
; use Stringt
;
85 with Stylesw
; use Stylesw
;
86 with Targparm
; use Targparm
;
87 with Tbuild
; use Tbuild
;
88 with Uintp
; use Uintp
;
89 with Urealp
; use Urealp
;
90 with Validsw
; use Validsw
;
92 package body Sem_Ch6
is
94 May_Hide_Profile
: Boolean := False;
95 -- This flag is used to indicate that two formals in two subprograms being
96 -- checked for conformance differ only in that one is an access parameter
97 -- while the other is of a general access type with the same designated
98 -- type. In this case, if the rest of the signatures match, a call to
99 -- either subprogram may be ambiguous, which is worth a warning. The flag
100 -- is set in Compatible_Types, and the warning emitted in
101 -- New_Overloaded_Entity.
103 -----------------------
104 -- Local Subprograms --
105 -----------------------
107 procedure Analyze_Function_Return
(N
: Node_Id
);
108 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
109 -- applies to a [generic] function.
111 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
112 -- Analyze a generic subprogram body. N is the body to be analyzed, and
113 -- Gen_Id is the defining entity Id for the corresponding spec.
115 procedure Analyze_Null_Procedure
117 Is_Completion
: out Boolean);
118 -- A null procedure can be a declaration or (Ada 2012) a completion
120 procedure Analyze_Return_Statement
(N
: Node_Id
);
121 -- Common processing for simple and extended return statements
123 procedure Analyze_Return_Type
(N
: Node_Id
);
124 -- Subsidiary to Process_Formals: analyze subtype mark in function
125 -- specification in a context where the formals are visible and hide
128 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
129 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
130 -- that we can use RETURN but not skip the debug output at the end.
132 function Can_Override_Operator
(Subp
: Entity_Id
) return Boolean;
133 -- Returns true if Subp can override a predefined operator.
135 procedure Check_Conformance
138 Ctype
: Conformance_Type
;
140 Conforms
: out Boolean;
141 Err_Loc
: Node_Id
:= Empty
;
142 Get_Inst
: Boolean := False;
143 Skip_Controlling_Formals
: Boolean := False);
144 -- Given two entities, this procedure checks that the profiles associated
145 -- with these entities meet the conformance criterion given by the third
146 -- parameter. If they conform, Conforms is set True and control returns
147 -- to the caller. If they do not conform, Conforms is set to False, and
148 -- in addition, if Errmsg is True on the call, proper messages are output
149 -- to complain about the conformance failure. If Err_Loc is non_Empty
150 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
151 -- error messages are placed on the appropriate part of the construct
152 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
153 -- against a formal access-to-subprogram type so Get_Instance_Of must
156 procedure Check_Subprogram_Order
(N
: Node_Id
);
157 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
158 -- the alpha ordering rule for N if this ordering requirement applicable.
160 procedure Check_Returns
164 Proc
: Entity_Id
:= Empty
);
165 -- Called to check for missing return statements in a function body, or for
166 -- returns present in a procedure body which has No_Return set. HSS is the
167 -- handled statement sequence for the subprogram body. This procedure
168 -- checks all flow paths to make sure they either have return (Mode = 'F',
169 -- used for functions) or do not have a return (Mode = 'P', used for
170 -- No_Return procedures). The flag Err is set if there are any control
171 -- paths not explicitly terminated by a return in the function case, and is
172 -- True otherwise. Proc is the entity for the procedure case and is used
173 -- in posting the warning message.
175 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
176 -- In Ada 2012, a primitive equality operator on an untagged record type
177 -- must appear before the type is frozen, and have the same visibility as
178 -- that of the type. This procedure checks that this rule is met, and
179 -- otherwise emits an error on the subprogram declaration and a warning
180 -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode,
181 -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier
182 -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility
183 -- is set, otherwise the call has no effect.
185 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
186 -- This procedure makes S, a new overloaded entity, into the first visible
187 -- entity with that name.
189 function Is_Non_Overriding_Operation
191 New_E
: Entity_Id
) return Boolean;
192 -- Enforce the rule given in 12.3(18): a private operation in an instance
193 -- overrides an inherited operation only if the corresponding operation
194 -- was overriding in the generic. This needs to be checked for primitive
195 -- operations of types derived (in the generic unit) from formal private
196 -- or formal derived types.
198 procedure Make_Inequality_Operator
(S
: Entity_Id
);
199 -- Create the declaration for an inequality operator that is implicitly
200 -- created by a user-defined equality operator that yields a boolean.
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_Abstract_Subprogram_Declaration --
209 ---------------------------------------------
211 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
212 Designator
: constant Entity_Id
:=
213 Analyze_Subprogram_Specification
(Specification
(N
));
214 Scop
: constant Entity_Id
:= Current_Scope
;
217 -- The abstract subprogram declaration may be subject to pragma Ghost
218 -- with policy Ignore. Set the mode now to ensure that any nodes
219 -- generated during analysis and expansion are properly flagged as
223 Check_SPARK_05_Restriction
("abstract subprogram is not allowed", N
);
225 Generate_Definition
(Designator
);
227 Set_Is_Abstract_Subprogram
(Designator
);
228 New_Overloaded_Entity
(Designator
);
229 Check_Delayed_Subprogram
(Designator
);
231 Set_Categorization_From_Scope
(Designator
, Scop
);
233 -- An abstract subprogram declared within a Ghost region is rendered
234 -- Ghost (SPARK RM 6.9(2)).
236 if Comes_From_Source
(Designator
) and then Ghost_Mode
> None
then
237 Set_Is_Ghost_Entity
(Designator
);
240 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
242 ("abstract subprogram not allowed in protected type", N
);
244 -- Issue a warning if the abstract subprogram is neither a dispatching
245 -- operation nor an operation that overrides an inherited subprogram or
246 -- predefined operator, since this most likely indicates a mistake.
248 elsif Warn_On_Redundant_Constructs
249 and then not Is_Dispatching_Operation
(Designator
)
250 and then not Present
(Overridden_Operation
(Designator
))
251 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
252 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
255 ("abstract subprogram is not dispatching or overriding?r?", N
);
258 Generate_Reference_To_Formals
(Designator
);
259 Check_Eliminated
(Designator
);
261 if Has_Aspects
(N
) then
262 Analyze_Aspect_Specifications
(N
, Designator
);
264 end Analyze_Abstract_Subprogram_Declaration
;
266 ---------------------------------
267 -- Analyze_Expression_Function --
268 ---------------------------------
270 procedure Analyze_Expression_Function
(N
: Node_Id
) is
271 Expr
: constant Node_Id
:= Expression
(N
);
272 Loc
: constant Source_Ptr
:= Sloc
(N
);
273 LocX
: constant Source_Ptr
:= Sloc
(Expr
);
274 Spec
: constant Node_Id
:= Specification
(N
);
279 -- If the expression is a completion, Prev is the entity whose
280 -- declaration is completed. Def_Id is needed to analyze the spec.
287 -- This is one of the occasions on which we transform the tree during
288 -- semantic analysis. If this is a completion, transform the expression
289 -- function into an equivalent subprogram body, and analyze it.
291 -- Expression functions are inlined unconditionally. The back-end will
292 -- determine whether this is possible.
294 Inline_Processing_Required
:= True;
296 -- Create a specification for the generated body. This must be done
297 -- prior to the analysis of the initial declaration.
299 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
300 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
302 -- If there are previous overloadable entities with the same name,
303 -- check whether any of them is completed by the expression function.
304 -- In a generic context a formal subprogram has no completion.
307 and then Is_Overloadable
(Prev
)
308 and then not Is_Formal_Subprogram
(Prev
)
310 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
311 Prev
:= Find_Corresponding_Spec
(N
);
313 -- The previous entity may be an expression function as well, in
314 -- which case the redeclaration is illegal.
317 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
318 N_Expression_Function
320 Error_Msg_Sloc
:= Sloc
(Prev
);
321 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
326 Ret
:= Make_Simple_Return_Statement
(LocX
, Expression
(N
));
329 Make_Subprogram_Body
(Loc
,
330 Specification
=> New_Spec
,
331 Declarations
=> Empty_List
,
332 Handled_Statement_Sequence
=>
333 Make_Handled_Sequence_Of_Statements
(LocX
,
334 Statements
=> New_List
(Ret
)));
336 -- If the expression completes a generic subprogram, we must create a
337 -- separate node for the body, because at instantiation the original
338 -- node of the generic copy must be a generic subprogram body, and
339 -- cannot be a expression function. Otherwise we just rewrite the
340 -- expression with the non-generic body.
342 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
343 Insert_After
(N
, New_Body
);
345 -- Propagate any aspects or pragmas that apply to the expression
346 -- function to the proper body when the expression function acts
349 if Has_Aspects
(N
) then
350 Move_Aspects
(N
, To
=> New_Body
);
353 Relocate_Pragmas_To_Body
(New_Body
);
355 Rewrite
(N
, Make_Null_Statement
(Loc
));
356 Set_Has_Completion
(Prev
, False);
359 Set_Is_Inlined
(Prev
);
361 -- If the expression function is a completion, the previous declaration
362 -- must come from source. We know already that appears in the current
363 -- scope. The entity itself may be internally created if within a body
367 and then Comes_From_Source
(Parent
(Prev
))
368 and then not Is_Formal_Subprogram
(Prev
)
370 Set_Has_Completion
(Prev
, False);
372 -- An expression function that is a completion freezes the
373 -- expression. This means freezing the return type, and if it is
374 -- an access type, freezing its designated type as well.
376 -- Note that we cannot defer this freezing to the analysis of the
377 -- expression itself, because a freeze node might appear in a nested
378 -- scope, leading to an elaboration order issue in gigi.
380 Freeze_Before
(N
, Etype
(Prev
));
382 if Is_Access_Type
(Etype
(Prev
)) then
383 Freeze_Before
(N
, Designated_Type
(Etype
(Prev
)));
386 -- For navigation purposes, indicate that the function is a body
388 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
389 Rewrite
(N
, New_Body
);
391 -- Correct the parent pointer of the aspect specification list to
392 -- reference the rewritten node.
394 if Has_Aspects
(N
) then
395 Set_Parent
(Aspect_Specifications
(N
), N
);
398 -- Propagate any pragmas that apply to the expression function to the
399 -- proper body when the expression function acts as a completion.
400 -- Aspects are automatically transfered because of node rewriting.
402 Relocate_Pragmas_To_Body
(N
);
405 -- Prev is the previous entity with the same name, but it is can
406 -- be an unrelated spec that is not completed by the expression
407 -- function. In that case the relevant entity is the one in the body.
408 -- Not clear that the backend can inline it in this case ???
410 if Has_Completion
(Prev
) then
411 Set_Is_Inlined
(Prev
);
413 -- The formals of the expression function are body formals,
414 -- and do not appear in the ali file, which will only contain
415 -- references to the formals of the original subprogram spec.
422 F1
:= First_Formal
(Def_Id
);
423 F2
:= First_Formal
(Prev
);
425 while Present
(F1
) loop
426 Set_Spec_Entity
(F1
, F2
);
433 Set_Is_Inlined
(Defining_Entity
(New_Body
));
436 -- If this is not a completion, create both a declaration and a body, so
437 -- that the expression can be inlined whenever possible.
440 -- An expression function that is not a completion is not a
441 -- subprogram declaration, and thus cannot appear in a protected
444 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
446 ("an expression function is not a legal protected operation", N
);
449 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
451 -- Correct the parent pointer of the aspect specification list to
452 -- reference the rewritten node.
454 if Has_Aspects
(N
) then
455 Set_Parent
(Aspect_Specifications
(N
), N
);
460 -- Within a generic pre-analyze the original expression for name
461 -- capture. The body is also generated but plays no role in
462 -- this because it is not part of the original source.
464 if Inside_A_Generic
then
466 Id
: constant Entity_Id
:= Defining_Entity
(N
);
469 Set_Has_Completion
(Id
);
471 Install_Formals
(Id
);
472 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
477 Set_Is_Inlined
(Defining_Entity
(N
));
479 -- Establish the linkages between the spec and the body. These are
480 -- used when the expression function acts as the prefix of attribute
481 -- 'Access in order to freeze the original expression which has been
482 -- moved to the generated body.
484 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
485 Set_Corresponding_Spec
(New_Body
, Defining_Entity
(N
));
487 -- To prevent premature freeze action, insert the new body at the end
488 -- of the current declarations, or at the end of the package spec.
489 -- However, resolve usage names now, to prevent spurious visibility
490 -- on later entities. Note that the function can now be called in
491 -- the current declarative part, which will appear to be prior to
492 -- the presence of the body in the code. There are nevertheless no
493 -- order of elaboration issues because all name resolution has taken
494 -- place at the point of declaration.
497 Decls
: List_Id
:= List_Containing
(N
);
498 Par
: constant Node_Id
:= Parent
(Decls
);
499 Id
: constant Entity_Id
:= Defining_Entity
(N
);
502 -- If this is a wrapper created for in an instance for a formal
503 -- subprogram, insert body after declaration, to be analyzed when
504 -- the enclosing instance is analyzed.
507 and then Is_Generic_Actual_Subprogram
(Defining_Entity
(N
))
509 Insert_After
(N
, New_Body
);
512 if Nkind
(Par
) = N_Package_Specification
513 and then Decls
= Visible_Declarations
(Par
)
514 and then Present
(Private_Declarations
(Par
))
515 and then not Is_Empty_List
(Private_Declarations
(Par
))
517 Decls
:= Private_Declarations
(Par
);
520 Insert_After
(Last
(Decls
), New_Body
);
522 Install_Formals
(Id
);
524 -- Preanalyze the expression for name capture, except in an
525 -- instance, where this has been done during generic analysis,
526 -- and will be redone when analyzing the body.
529 Expr
: constant Node_Id
:= Expression
(Ret
);
532 Set_Parent
(Expr
, Ret
);
534 if not In_Instance
then
535 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
544 -- If the return expression is a static constant, we suppress warning
545 -- messages on unused formals, which in most cases will be noise.
547 Set_Is_Trivial_Subprogram
(Defining_Entity
(New_Body
),
548 Is_OK_Static_Expression
(Expr
));
549 end Analyze_Expression_Function
;
551 ----------------------------------------
552 -- Analyze_Extended_Return_Statement --
553 ----------------------------------------
555 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
557 Check_Compiler_Unit
("extended return statement", N
);
558 Analyze_Return_Statement
(N
);
559 end Analyze_Extended_Return_Statement
;
561 ----------------------------
562 -- Analyze_Function_Call --
563 ----------------------------
565 procedure Analyze_Function_Call
(N
: Node_Id
) is
566 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
567 Func_Nam
: constant Node_Id
:= Name
(N
);
573 -- A call of the form A.B (X) may be an Ada 2005 call, which is
574 -- rewritten as B (A, X). If the rewriting is successful, the call
575 -- has been analyzed and we just return.
577 if Nkind
(Func_Nam
) = N_Selected_Component
578 and then Name
(N
) /= Func_Nam
579 and then Is_Rewrite_Substitution
(N
)
580 and then Present
(Etype
(N
))
585 -- If error analyzing name, then set Any_Type as result type and return
587 if Etype
(Func_Nam
) = Any_Type
then
588 Set_Etype
(N
, Any_Type
);
592 -- Otherwise analyze the parameters
594 if Present
(Actuals
) then
595 Actual
:= First
(Actuals
);
596 while Present
(Actual
) loop
598 Check_Parameterless_Call
(Actual
);
604 end Analyze_Function_Call
;
606 -----------------------------
607 -- Analyze_Function_Return --
608 -----------------------------
610 procedure Analyze_Function_Return
(N
: Node_Id
) is
611 Loc
: constant Source_Ptr
:= Sloc
(N
);
612 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
613 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
615 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
616 -- Function result subtype
618 procedure Check_Limited_Return
(Expr
: Node_Id
);
619 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
620 -- limited types. Used only for simple return statements.
621 -- Expr is the expression returned.
623 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
624 -- Check that the return_subtype_indication properly matches the result
625 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
627 --------------------------
628 -- Check_Limited_Return --
629 --------------------------
631 procedure Check_Limited_Return
(Expr
: Node_Id
) is
633 -- Ada 2005 (AI-318-02): Return-by-reference types have been
634 -- removed and replaced by anonymous access results. This is an
635 -- incompatibility with Ada 95. Not clear whether this should be
636 -- enforced yet or perhaps controllable with special switch. ???
638 -- A limited interface that is not immutably limited is OK.
640 if Is_Limited_Interface
(R_Type
)
642 not (Is_Task_Interface
(R_Type
)
643 or else Is_Protected_Interface
(R_Type
)
644 or else Is_Synchronized_Interface
(R_Type
))
648 elsif Is_Limited_Type
(R_Type
)
649 and then not Is_Interface
(R_Type
)
650 and then Comes_From_Source
(N
)
651 and then not In_Instance_Body
652 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
656 if Ada_Version
>= Ada_2005
657 and then not Debug_Flag_Dot_L
658 and then not GNAT_Mode
661 ("(Ada 2005) cannot copy object of a limited type "
662 & "(RM-2005 6.5(5.5/2))", Expr
);
664 if Is_Limited_View
(R_Type
) then
666 ("\return by reference not permitted in Ada 2005", Expr
);
669 -- Warn in Ada 95 mode, to give folks a heads up about this
672 -- In GNAT mode, this is just a warning, to allow it to be
673 -- evilly turned off. Otherwise it is a real error.
675 -- In a generic context, simplify the warning because it makes
676 -- no sense to discuss pass-by-reference or copy.
678 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
679 if Inside_A_Generic
then
681 ("return of limited object not permitted in Ada 2005 "
682 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
684 elsif Is_Limited_View
(R_Type
) then
686 ("return by reference not permitted in Ada 2005 "
687 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
690 ("cannot copy object of a limited type in Ada 2005 "
691 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
694 -- Ada 95 mode, compatibility warnings disabled
697 return; -- skip continuation messages below
700 if not Inside_A_Generic
then
702 ("\consider switching to return of access type", Expr
);
703 Explain_Limited_Type
(R_Type
, Expr
);
706 end Check_Limited_Return
;
708 -------------------------------------
709 -- Check_Return_Subtype_Indication --
710 -------------------------------------
712 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
713 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
715 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
716 -- Subtype given in the extended return statement (must match R_Type)
718 Subtype_Ind
: constant Node_Id
:=
719 Object_Definition
(Original_Node
(Obj_Decl
));
721 R_Type_Is_Anon_Access
: constant Boolean :=
723 E_Anonymous_Access_Subprogram_Type
,
724 E_Anonymous_Access_Protected_Subprogram_Type
,
725 E_Anonymous_Access_Type
);
726 -- True if return type of the function is an anonymous access type
727 -- Can't we make Is_Anonymous_Access_Type in einfo ???
729 R_Stm_Type_Is_Anon_Access
: constant Boolean :=
730 Ekind_In
(R_Stm_Type
,
731 E_Anonymous_Access_Subprogram_Type
,
732 E_Anonymous_Access_Protected_Subprogram_Type
,
733 E_Anonymous_Access_Type
);
734 -- True if type of the return object is an anonymous access type
736 procedure Error_No_Match
(N
: Node_Id
);
737 -- Output error messages for case where types do not statically
738 -- match. N is the location for the messages.
744 procedure Error_No_Match
(N
: Node_Id
) is
747 ("subtype must statically match function result subtype", N
);
749 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
750 Error_Msg_Node_2
:= R_Type
;
752 ("\predicate of& does not match predicate of&",
757 -- Start of processing for Check_Return_Subtype_Indication
760 -- First, avoid cascaded errors
762 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
766 -- "return access T" case; check that the return statement also has
767 -- "access T", and that the subtypes statically match:
768 -- if this is an access to subprogram the signatures must match.
770 if R_Type_Is_Anon_Access
then
771 if R_Stm_Type_Is_Anon_Access
then
773 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
775 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
776 Base_Type
(Designated_Type
(R_Type
))
777 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
779 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
783 -- For two anonymous access to subprogram types, the
784 -- types themselves must be type conformant.
786 if not Conforming_Types
787 (R_Stm_Type
, R_Type
, Fully_Conformant
)
789 Error_No_Match
(Subtype_Ind
);
794 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
797 -- If the return object is of an anonymous access type, then report
798 -- an error if the function's result type is not also anonymous.
800 elsif R_Stm_Type_Is_Anon_Access
801 and then not R_Type_Is_Anon_Access
803 Error_Msg_N
("anonymous access not allowed for function with "
804 & "named access result", Subtype_Ind
);
806 -- Subtype indication case: check that the return object's type is
807 -- covered by the result type, and that the subtypes statically match
808 -- when the result subtype is constrained. Also handle record types
809 -- with unknown discriminants for which we have built the underlying
810 -- record view. Coverage is needed to allow specific-type return
811 -- objects when the result type is class-wide (see AI05-32).
813 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
814 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
818 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
820 -- A null exclusion may be present on the return type, on the
821 -- function specification, on the object declaration or on the
824 if Is_Access_Type
(R_Type
)
826 (Can_Never_Be_Null
(R_Type
)
827 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
828 Can_Never_Be_Null
(R_Stm_Type
)
830 Error_No_Match
(Subtype_Ind
);
833 -- AI05-103: for elementary types, subtypes must statically match
835 if Is_Constrained
(R_Type
)
836 or else Is_Access_Type
(R_Type
)
838 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
839 Error_No_Match
(Subtype_Ind
);
843 -- All remaining cases are illegal
845 -- Note: previous versions of this subprogram allowed the return
846 -- value to be the ancestor of the return type if the return type
847 -- was a null extension. This was plainly incorrect.
851 ("wrong type for return_subtype_indication", Subtype_Ind
);
853 end Check_Return_Subtype_Indication
;
855 ---------------------
856 -- Local Variables --
857 ---------------------
862 -- Start of processing for Analyze_Function_Return
865 Set_Return_Present
(Scope_Id
);
867 if Nkind
(N
) = N_Simple_Return_Statement
then
868 Expr
:= Expression
(N
);
870 -- Guard against a malformed expression. The parser may have tried to
871 -- recover but the node is not analyzable.
873 if Nkind
(Expr
) = N_Error
then
874 Set_Etype
(Expr
, Any_Type
);
875 Expander_Mode_Save_And_Set
(False);
879 -- The resolution of a controlled [extension] aggregate associated
880 -- with a return statement creates a temporary which needs to be
881 -- finalized on function exit. Wrap the return statement inside a
882 -- block so that the finalization machinery can detect this case.
883 -- This early expansion is done only when the return statement is
884 -- not part of a handled sequence of statements.
886 if Nkind_In
(Expr
, N_Aggregate
,
887 N_Extension_Aggregate
)
888 and then Needs_Finalization
(R_Type
)
889 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
892 Make_Block_Statement
(Loc
,
893 Handled_Statement_Sequence
=>
894 Make_Handled_Sequence_Of_Statements
(Loc
,
895 Statements
=> New_List
(Relocate_Node
(N
)))));
903 -- Ada 2005 (AI-251): If the type of the returned object is
904 -- an access to an interface type then we add an implicit type
905 -- conversion to force the displacement of the "this" pointer to
906 -- reference the secondary dispatch table. We cannot delay the
907 -- generation of this implicit conversion until the expansion
908 -- because in this case the type resolution changes the decoration
909 -- of the expression node to match R_Type; by contrast, if the
910 -- returned object is a class-wide interface type then it is too
911 -- early to generate here the implicit conversion since the return
912 -- statement may be rewritten by the expander into an extended
913 -- return statement whose expansion takes care of adding the
914 -- implicit type conversion to displace the pointer to the object.
917 and then Serious_Errors_Detected
= 0
918 and then Is_Access_Type
(R_Type
)
919 and then Nkind
(Expr
) /= N_Null
920 and then Is_Interface
(Designated_Type
(R_Type
))
921 and then Is_Progenitor
(Designated_Type
(R_Type
),
922 Designated_Type
(Etype
(Expr
)))
924 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
928 Resolve
(Expr
, R_Type
);
929 Check_Limited_Return
(Expr
);
932 -- RETURN only allowed in SPARK as the last statement in function
934 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
936 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
937 or else Present
(Next
(N
)))
939 Check_SPARK_05_Restriction
940 ("RETURN should be the last statement in function", N
);
944 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
945 Obj_Decl
:= Last
(Return_Object_Declarations
(N
));
947 -- Analyze parts specific to extended_return_statement:
950 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
951 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
954 Expr
:= Expression
(Obj_Decl
);
956 -- Note: The check for OK_For_Limited_Init will happen in
957 -- Analyze_Object_Declaration; we treat it as a normal
958 -- object declaration.
960 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
963 Check_Return_Subtype_Indication
(Obj_Decl
);
965 if Present
(HSS
) then
968 if Present
(Exception_Handlers
(HSS
)) then
970 -- ???Has_Nested_Block_With_Handler needs to be set.
971 -- Probably by creating an actual N_Block_Statement.
972 -- Probably in Expand.
978 -- Mark the return object as referenced, since the return is an
979 -- implicit reference of the object.
981 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
983 Check_References
(Stm_Entity
);
985 -- Check RM 6.5 (5.9/3)
988 if Ada_Version
< Ada_2012
then
990 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
991 -- Can it really happen (extended return???)
994 ("aliased only allowed for limited return objects "
995 & "in Ada 2012??", N
);
997 elsif not Is_Limited_View
(R_Type
) then
999 ("aliased only allowed for limited return objects", N
);
1005 -- Case of Expr present
1009 -- Defend against previous errors
1011 and then Nkind
(Expr
) /= N_Empty
1012 and then Present
(Etype
(Expr
))
1014 -- Apply constraint check. Note that this is done before the implicit
1015 -- conversion of the expression done for anonymous access types to
1016 -- ensure correct generation of the null-excluding check associated
1017 -- with null-excluding expressions found in return statements.
1019 Apply_Constraint_Check
(Expr
, R_Type
);
1021 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1022 -- type, apply an implicit conversion of the expression to that type
1023 -- to force appropriate static and run-time accessibility checks.
1025 if Ada_Version
>= Ada_2005
1026 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1028 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1029 Analyze_And_Resolve
(Expr
, R_Type
);
1031 -- If this is a local anonymous access to subprogram, the
1032 -- accessibility check can be applied statically. The return is
1033 -- illegal if the access type of the return expression is declared
1034 -- inside of the subprogram (except if it is the subtype indication
1035 -- of an extended return statement).
1037 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1038 if not Comes_From_Source
(Current_Scope
)
1039 or else Ekind
(Current_Scope
) = E_Return_Statement
1044 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1046 Error_Msg_N
("cannot return local access to subprogram", N
);
1049 -- The expression cannot be of a formal incomplete type
1051 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1052 and then Is_Generic_Type
(Etype
(Expr
))
1055 ("cannot return expression of a formal incomplete type", N
);
1058 -- If the result type is class-wide, then check that the return
1059 -- expression's type is not declared at a deeper level than the
1060 -- function (RM05-6.5(5.6/2)).
1062 if Ada_Version
>= Ada_2005
1063 and then Is_Class_Wide_Type
(R_Type
)
1065 if Type_Access_Level
(Etype
(Expr
)) >
1066 Subprogram_Access_Level
(Scope_Id
)
1069 ("level of return expression type is deeper than "
1070 & "class-wide function!", Expr
);
1074 -- Check incorrect use of dynamically tagged expression
1076 if Is_Tagged_Type
(R_Type
) then
1077 Check_Dynamically_Tagged_Expression
1083 -- ??? A real run-time accessibility check is needed in cases
1084 -- involving dereferences of access parameters. For now we just
1085 -- check the static cases.
1087 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1088 and then Is_Limited_View
(Etype
(Scope_Id
))
1089 and then Object_Access_Level
(Expr
) >
1090 Subprogram_Access_Level
(Scope_Id
)
1092 -- Suppress the message in a generic, where the rewriting
1095 if Inside_A_Generic
then
1100 Make_Raise_Program_Error
(Loc
,
1101 Reason
=> PE_Accessibility_Check_Failed
));
1104 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1105 Error_Msg_N
("cannot return a local value by reference<<", N
);
1106 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1110 if Known_Null
(Expr
)
1111 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1112 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1114 Apply_Compile_Time_Constraint_Error
1116 Msg
=> "(Ada 2005) null not allowed for "
1117 & "null-excluding return??",
1118 Reason
=> CE_Null_Not_Allowed
);
1121 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1122 -- has no initializing expression.
1124 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1125 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1126 Subprogram_Access_Level
(Scope_Id
)
1129 ("level of return expression type is deeper than "
1130 & "class-wide function!", Obj_Decl
);
1133 end Analyze_Function_Return
;
1135 -------------------------------------
1136 -- Analyze_Generic_Subprogram_Body --
1137 -------------------------------------
1139 procedure Analyze_Generic_Subprogram_Body
1143 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1144 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1145 Body_Id
: Entity_Id
;
1150 -- Copy body and disable expansion while analyzing the generic For a
1151 -- stub, do not copy the stub (which would load the proper body), this
1152 -- will be done when the proper body is analyzed.
1154 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1155 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1158 -- Once the contents of the generic copy and the template are
1159 -- swapped, do the same for their respective aspect specifications.
1161 Exchange_Aspects
(N
, New_N
);
1163 -- Collect all contract-related source pragmas found within the
1164 -- template and attach them to the contract of the subprogram body.
1165 -- This contract is used in the capture of global references within
1168 Create_Generic_Contract
(N
);
1173 Spec
:= Specification
(N
);
1175 -- Within the body of the generic, the subprogram is callable, and
1176 -- behaves like the corresponding non-generic unit.
1178 Body_Id
:= Defining_Entity
(Spec
);
1180 if Kind
= E_Generic_Procedure
1181 and then Nkind
(Spec
) /= N_Procedure_Specification
1183 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1186 elsif Kind
= E_Generic_Function
1187 and then Nkind
(Spec
) /= N_Function_Specification
1189 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1193 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1195 if Has_Completion
(Gen_Id
)
1196 and then Nkind
(Parent
(N
)) /= N_Subunit
1198 Error_Msg_N
("duplicate generic body", N
);
1201 Set_Has_Completion
(Gen_Id
);
1204 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1205 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1207 Set_Corresponding_Spec
(N
, Gen_Id
);
1210 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1211 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1214 -- Make generic parameters immediately visible in the body. They are
1215 -- needed to process the formals declarations. Then make the formals
1216 -- visible in a separate step.
1218 Push_Scope
(Gen_Id
);
1222 First_Ent
: Entity_Id
;
1225 First_Ent
:= First_Entity
(Gen_Id
);
1228 while Present
(E
) and then not Is_Formal
(E
) loop
1233 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1235 -- Now generic formals are visible, and the specification can be
1236 -- analyzed, for subsequent conformance check.
1238 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1240 -- Make formal parameters visible
1244 -- E is the first formal parameter, we loop through the formals
1245 -- installing them so that they will be visible.
1247 Set_First_Entity
(Gen_Id
, E
);
1248 while Present
(E
) loop
1254 -- Visible generic entity is callable within its own body
1256 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1257 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1258 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1259 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1260 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1262 -- Inherit the "ghostness" of the generic spec. Note that this
1263 -- property is not directly inherited as the body may be subject
1264 -- to a different Ghost assertion policy.
1266 if Is_Ghost_Entity
(Gen_Id
) or else Ghost_Mode
> None
then
1267 Set_Is_Ghost_Entity
(Body_Id
);
1269 -- The Ghost policy in effect at the point of declaration and at
1270 -- the point of completion must match (SPARK RM 6.9(14)).
1272 Check_Ghost_Completion
(Gen_Id
, Body_Id
);
1275 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1277 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1279 -- No body to analyze, so restore state of generic unit
1281 Set_Ekind
(Gen_Id
, Kind
);
1282 Set_Ekind
(Body_Id
, Kind
);
1284 if Present
(First_Ent
) then
1285 Set_First_Entity
(Gen_Id
, First_Ent
);
1292 -- If this is a compilation unit, it must be made visible explicitly,
1293 -- because the compilation of the declaration, unlike other library
1294 -- unit declarations, does not. If it is not a unit, the following
1295 -- is redundant but harmless.
1297 Set_Is_Immediately_Visible
(Gen_Id
);
1298 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1300 if Is_Child_Unit
(Gen_Id
) then
1301 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1304 Set_Actual_Subtypes
(N
, Current_Scope
);
1306 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1307 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
1309 -- Analyze any aspect specifications that appear on the generic
1312 if Has_Aspects
(N
) then
1313 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
1316 Analyze_Declarations
(Declarations
(N
));
1319 -- When a generic subprogram body appears inside a package, its
1320 -- contract is analyzed at the end of the package body declarations.
1321 -- This is due to the delay with respect of the package contract upon
1322 -- which the body contract may depend. When the generic subprogram
1323 -- body is a compilation unit, this delay is not necessary.
1325 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1326 Analyze_Subprogram_Body_Contract
(Body_Id
);
1328 -- Capture all global references in a generic subprogram body
1329 -- that acts as a compilation unit now that the contract has
1332 Save_Global_References_In_Contract
1333 (Templ
=> Original_Node
(N
),
1337 Analyze
(Handled_Statement_Sequence
(N
));
1338 Save_Global_References
(Original_Node
(N
));
1340 -- Prior to exiting the scope, include generic formals again (if any
1341 -- are present) in the set of local entities.
1343 if Present
(First_Ent
) then
1344 Set_First_Entity
(Gen_Id
, First_Ent
);
1347 Check_References
(Gen_Id
);
1350 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1352 Check_Subprogram_Order
(N
);
1354 -- Outside of its body, unit is generic again
1356 Set_Ekind
(Gen_Id
, Kind
);
1357 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1360 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1364 end Analyze_Generic_Subprogram_Body
;
1366 ----------------------------
1367 -- Analyze_Null_Procedure --
1368 ----------------------------
1370 procedure Analyze_Null_Procedure
1372 Is_Completion
: out Boolean)
1374 Loc
: constant Source_Ptr
:= Sloc
(N
);
1375 Spec
: constant Node_Id
:= Specification
(N
);
1376 Designator
: Entity_Id
;
1378 Null_Body
: Node_Id
:= Empty
;
1382 -- Capture the profile of the null procedure before analysis, for
1383 -- expansion at the freeze point and at each point of call. The body is
1384 -- used if the procedure has preconditions, or if it is a completion. In
1385 -- the first case the body is analyzed at the freeze point, in the other
1386 -- it replaces the null procedure declaration.
1389 Make_Subprogram_Body
(Loc
,
1390 Specification
=> New_Copy_Tree
(Spec
),
1391 Declarations
=> New_List
,
1392 Handled_Statement_Sequence
=>
1393 Make_Handled_Sequence_Of_Statements
(Loc
,
1394 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
1396 -- Create new entities for body and formals
1398 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1399 Make_Defining_Identifier
1400 (Sloc
(Defining_Entity
(N
)),
1401 Chars
(Defining_Entity
(N
))));
1403 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1404 while Present
(Form
) loop
1405 Set_Defining_Identifier
(Form
,
1406 Make_Defining_Identifier
1407 (Sloc
(Defining_Identifier
(Form
)),
1408 Chars
(Defining_Identifier
(Form
))));
1412 -- Determine whether the null procedure may be a completion of a generic
1413 -- suprogram, in which case we use the new null body as the completion
1414 -- and set minimal semantic information on the original declaration,
1415 -- which is rewritten as a null statement.
1417 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1419 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1420 Insert_Before
(N
, Null_Body
);
1421 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1423 Rewrite
(N
, Make_Null_Statement
(Loc
));
1424 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1425 Is_Completion
:= True;
1429 -- Resolve the types of the formals now, because the freeze point
1430 -- may appear in a different context, e.g. an instantiation.
1432 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1433 while Present
(Form
) loop
1434 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1435 Find_Type
(Parameter_Type
(Form
));
1438 No
(Access_To_Subprogram_Definition
(Parameter_Type
(Form
)))
1440 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1443 -- The case of a null procedure with a formal that is an
1444 -- access_to_subprogram type, and that is used as an actual
1445 -- in an instantiation is left to the enthusiastic reader.
1454 -- If there are previous overloadable entities with the same name,
1455 -- check whether any of them is completed by the null procedure.
1457 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1458 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1459 Prev
:= Find_Corresponding_Spec
(N
);
1462 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1463 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1464 Set_Has_Completion
(Designator
);
1466 -- Signal to caller that this is a procedure declaration
1468 Is_Completion
:= False;
1470 -- Null procedures are always inlined, but generic formal subprograms
1471 -- which appear as such in the internal instance of formal packages,
1472 -- need no completion and are not marked Inline.
1475 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1477 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1478 Set_Body_To_Inline
(N
, Null_Body
);
1479 Set_Is_Inlined
(Designator
);
1483 -- The null procedure is a completion. We unconditionally rewrite
1484 -- this as a null body (even if expansion is not active), because
1485 -- there are various error checks that are applied on this body
1486 -- when it is analyzed (e.g. correct aspect placement).
1488 if Has_Completion
(Prev
) then
1489 Error_Msg_Sloc
:= Sloc
(Prev
);
1490 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1493 Is_Completion
:= True;
1494 Rewrite
(N
, Null_Body
);
1497 end Analyze_Null_Procedure
;
1499 -----------------------------
1500 -- Analyze_Operator_Symbol --
1501 -----------------------------
1503 -- An operator symbol such as "+" or "and" may appear in context where the
1504 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1505 -- is just a string, as in (conjunction = "or"). In these cases the parser
1506 -- generates this node, and the semantics does the disambiguation. Other
1507 -- such case are actuals in an instantiation, the generic unit in an
1508 -- instantiation, and pragma arguments.
1510 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1511 Par
: constant Node_Id
:= Parent
(N
);
1514 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1515 or else Nkind
(Par
) = N_Function_Instantiation
1516 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1517 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1518 and then not Is_Pragma_String_Literal
(Par
))
1519 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1520 or else (Nkind
(Par
) = N_Attribute_Reference
1521 and then Attribute_Name
(Par
) /= Name_Value
)
1523 Find_Direct_Name
(N
);
1526 Change_Operator_Symbol_To_String_Literal
(N
);
1529 end Analyze_Operator_Symbol
;
1531 -----------------------------------
1532 -- Analyze_Parameter_Association --
1533 -----------------------------------
1535 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1537 Analyze
(Explicit_Actual_Parameter
(N
));
1538 end Analyze_Parameter_Association
;
1540 ----------------------------
1541 -- Analyze_Procedure_Call --
1542 ----------------------------
1544 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1545 Loc
: constant Source_Ptr
:= Sloc
(N
);
1546 P
: constant Node_Id
:= Name
(N
);
1547 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1551 procedure Analyze_Call_And_Resolve
;
1552 -- Do Analyze and Resolve calls for procedure call
1553 -- At end, check illegal order dependence.
1555 ------------------------------
1556 -- Analyze_Call_And_Resolve --
1557 ------------------------------
1559 procedure Analyze_Call_And_Resolve
is
1561 if Nkind
(N
) = N_Procedure_Call_Statement
then
1563 Resolve
(N
, Standard_Void_Type
);
1567 end Analyze_Call_And_Resolve
;
1569 -- Start of processing for Analyze_Procedure_Call
1572 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1573 -- a procedure call or an entry call. The prefix may denote an access
1574 -- to subprogram type, in which case an implicit dereference applies.
1575 -- If the prefix is an indexed component (without implicit dereference)
1576 -- then the construct denotes a call to a member of an entire family.
1577 -- If the prefix is a simple name, it may still denote a call to a
1578 -- parameterless member of an entry family. Resolution of these various
1579 -- interpretations is delicate.
1583 -- If this is a call of the form Obj.Op, the call may have been
1584 -- analyzed and possibly rewritten into a block, in which case
1587 if Analyzed
(N
) then
1591 -- If there is an error analyzing the name (which may have been
1592 -- rewritten if the original call was in prefix notation) then error
1593 -- has been emitted already, mark node and return.
1595 if Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1596 Set_Etype
(N
, Any_Type
);
1600 -- The name of the procedure call may reference an entity subject to
1601 -- pragma Ghost with policy Ignore. Set the mode now to ensure that any
1602 -- nodes generated during analysis and expansion are properly flagged as
1607 -- Otherwise analyze the parameters
1609 if Present
(Actuals
) then
1610 Actual
:= First
(Actuals
);
1612 while Present
(Actual
) loop
1614 Check_Parameterless_Call
(Actual
);
1619 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1621 if Nkind
(P
) = N_Attribute_Reference
1622 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1624 Name_Elab_Subp_Body
)
1626 if Present
(Actuals
) then
1628 ("no parameters allowed for this call", First
(Actuals
));
1632 Set_Etype
(N
, Standard_Void_Type
);
1635 elsif Is_Entity_Name
(P
)
1636 and then Is_Record_Type
(Etype
(Entity
(P
)))
1637 and then Remote_AST_I_Dereference
(P
)
1641 elsif Is_Entity_Name
(P
)
1642 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1644 if Is_Access_Type
(Etype
(P
))
1645 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1646 and then No
(Actuals
)
1647 and then Comes_From_Source
(N
)
1649 Error_Msg_N
("missing explicit dereference in call", N
);
1652 Analyze_Call_And_Resolve
;
1654 -- If the prefix is the simple name of an entry family, this is
1655 -- a parameterless call from within the task body itself.
1657 elsif Is_Entity_Name
(P
)
1658 and then Nkind
(P
) = N_Identifier
1659 and then Ekind
(Entity
(P
)) = E_Entry_Family
1660 and then Present
(Actuals
)
1661 and then No
(Next
(First
(Actuals
)))
1663 -- Can be call to parameterless entry family. What appears to be the
1664 -- sole argument is in fact the entry index. Rewrite prefix of node
1665 -- accordingly. Source representation is unchanged by this
1669 Make_Indexed_Component
(Loc
,
1671 Make_Selected_Component
(Loc
,
1672 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1673 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1674 Expressions
=> Actuals
);
1675 Set_Name
(N
, New_N
);
1676 Set_Etype
(New_N
, Standard_Void_Type
);
1677 Set_Parameter_Associations
(N
, No_List
);
1678 Analyze_Call_And_Resolve
;
1680 elsif Nkind
(P
) = N_Explicit_Dereference
then
1681 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1682 Analyze_Call_And_Resolve
;
1684 Error_Msg_N
("expect access to procedure in call", P
);
1687 -- The name can be a selected component or an indexed component that
1688 -- yields an access to subprogram. Such a prefix is legal if the call
1689 -- has parameter associations.
1691 elsif Is_Access_Type
(Etype
(P
))
1692 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1694 if Present
(Actuals
) then
1695 Analyze_Call_And_Resolve
;
1697 Error_Msg_N
("missing explicit dereference in call ", N
);
1700 -- If not an access to subprogram, then the prefix must resolve to the
1701 -- name of an entry, entry family, or protected operation.
1703 -- For the case of a simple entry call, P is a selected component where
1704 -- the prefix is the task and the selector name is the entry. A call to
1705 -- a protected procedure will have the same syntax. If the protected
1706 -- object contains overloaded operations, the entity may appear as a
1707 -- function, the context will select the operation whose type is Void.
1709 elsif Nkind
(P
) = N_Selected_Component
1710 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1714 Analyze_Call_And_Resolve
;
1716 elsif Nkind
(P
) = N_Selected_Component
1717 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1718 and then Present
(Actuals
)
1719 and then No
(Next
(First
(Actuals
)))
1721 -- Can be call to parameterless entry family. What appears to be the
1722 -- sole argument is in fact the entry index. Rewrite prefix of node
1723 -- accordingly. Source representation is unchanged by this
1727 Make_Indexed_Component
(Loc
,
1728 Prefix
=> New_Copy
(P
),
1729 Expressions
=> Actuals
);
1730 Set_Name
(N
, New_N
);
1731 Set_Etype
(New_N
, Standard_Void_Type
);
1732 Set_Parameter_Associations
(N
, No_List
);
1733 Analyze_Call_And_Resolve
;
1735 -- For the case of a reference to an element of an entry family, P is
1736 -- an indexed component whose prefix is a selected component (task and
1737 -- entry family), and whose index is the entry family index.
1739 elsif Nkind
(P
) = N_Indexed_Component
1740 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1741 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1743 Analyze_Call_And_Resolve
;
1745 -- If the prefix is the name of an entry family, it is a call from
1746 -- within the task body itself.
1748 elsif Nkind
(P
) = N_Indexed_Component
1749 and then Nkind
(Prefix
(P
)) = N_Identifier
1750 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1753 Make_Selected_Component
(Loc
,
1754 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1755 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1756 Rewrite
(Prefix
(P
), New_N
);
1758 Analyze_Call_And_Resolve
;
1760 -- In Ada 2012. a qualified expression is a name, but it cannot be a
1761 -- procedure name, so the construct can only be a qualified expression.
1763 elsif Nkind
(P
) = N_Qualified_Expression
1764 and then Ada_Version
>= Ada_2012
1766 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
1769 -- Anything else is an error
1772 Error_Msg_N
("invalid procedure or entry call", N
);
1774 end Analyze_Procedure_Call
;
1776 ------------------------------
1777 -- Analyze_Return_Statement --
1778 ------------------------------
1780 procedure Analyze_Return_Statement
(N
: Node_Id
) is
1782 pragma Assert
(Nkind_In
(N
, N_Simple_Return_Statement
,
1783 N_Extended_Return_Statement
));
1785 Returns_Object
: constant Boolean :=
1786 Nkind
(N
) = N_Extended_Return_Statement
1788 (Nkind
(N
) = N_Simple_Return_Statement
1789 and then Present
(Expression
(N
)));
1790 -- True if we're returning something; that is, "return <expression>;"
1791 -- or "return Result : T [:= ...]". False for "return;". Used for error
1792 -- checking: If Returns_Object is True, N should apply to a function
1793 -- body; otherwise N should apply to a procedure body, entry body,
1794 -- accept statement, or extended return statement.
1796 function Find_What_It_Applies_To
return Entity_Id
;
1797 -- Find the entity representing the innermost enclosing body, accept
1798 -- statement, or extended return statement. If the result is a callable
1799 -- construct or extended return statement, then this will be the value
1800 -- of the Return_Applies_To attribute. Otherwise, the program is
1801 -- illegal. See RM-6.5(4/2).
1803 -----------------------------
1804 -- Find_What_It_Applies_To --
1805 -----------------------------
1807 function Find_What_It_Applies_To
return Entity_Id
is
1808 Result
: Entity_Id
:= Empty
;
1811 -- Loop outward through the Scope_Stack, skipping blocks, loops,
1812 -- and postconditions.
1814 for J
in reverse 0 .. Scope_Stack
.Last
loop
1815 Result
:= Scope_Stack
.Table
(J
).Entity
;
1816 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
1817 and then Chars
(Result
) /= Name_uPostconditions
;
1820 pragma Assert
(Present
(Result
));
1822 end Find_What_It_Applies_To
;
1824 -- Local declarations
1826 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
1827 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
1828 Loc
: constant Source_Ptr
:= Sloc
(N
);
1829 Stm_Entity
: constant Entity_Id
:=
1831 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
1833 -- Start of processing for Analyze_Return_Statement
1836 Set_Return_Statement_Entity
(N
, Stm_Entity
);
1838 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
1839 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
1841 -- Place Return entity on scope stack, to simplify enforcement of 6.5
1842 -- (4/2): an inner return statement will apply to this extended return.
1844 if Nkind
(N
) = N_Extended_Return_Statement
then
1845 Push_Scope
(Stm_Entity
);
1848 -- Check that pragma No_Return is obeyed. Don't complain about the
1849 -- implicitly-generated return that is placed at the end.
1851 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
1852 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
1855 -- Warn on any unassigned OUT parameters if in procedure
1857 if Ekind
(Scope_Id
) = E_Procedure
then
1858 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
1861 -- Check that functions return objects, and other things do not
1863 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
1864 if not Returns_Object
then
1865 Error_Msg_N
("missing expression in return from function", N
);
1868 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
1869 if Returns_Object
then
1870 Error_Msg_N
("procedure cannot return value (use function)", N
);
1873 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
1874 if Returns_Object
then
1875 if Is_Protected_Type
(Scope
(Scope_Id
)) then
1876 Error_Msg_N
("entry body cannot return value", N
);
1878 Error_Msg_N
("accept statement cannot return value", N
);
1882 elsif Kind
= E_Return_Statement
then
1884 -- We are nested within another return statement, which must be an
1885 -- extended_return_statement.
1887 if Returns_Object
then
1888 if Nkind
(N
) = N_Extended_Return_Statement
then
1890 ("extended return statement cannot be nested (use `RETURN;`)",
1893 -- Case of a simple return statement with a value inside extended
1894 -- return statement.
1898 ("return nested in extended return statement cannot return "
1899 & "value (use `RETURN;`)", N
);
1904 Error_Msg_N
("illegal context for return statement", N
);
1907 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
1908 Analyze_Function_Return
(N
);
1910 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
1911 Set_Return_Present
(Scope_Id
);
1914 if Nkind
(N
) = N_Extended_Return_Statement
then
1918 Kill_Current_Values
(Last_Assignment_Only
=> True);
1919 Check_Unreachable_Code
(N
);
1921 Analyze_Dimension
(N
);
1922 end Analyze_Return_Statement
;
1924 -------------------------------------
1925 -- Analyze_Simple_Return_Statement --
1926 -------------------------------------
1928 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1930 if Present
(Expression
(N
)) then
1931 Mark_Coextensions
(N
, Expression
(N
));
1934 Analyze_Return_Statement
(N
);
1935 end Analyze_Simple_Return_Statement
;
1937 -------------------------
1938 -- Analyze_Return_Type --
1939 -------------------------
1941 procedure Analyze_Return_Type
(N
: Node_Id
) is
1942 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1943 Typ
: Entity_Id
:= Empty
;
1946 -- Normal case where result definition does not indicate an error
1948 if Result_Definition
(N
) /= Error
then
1949 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1950 Check_SPARK_05_Restriction
1951 ("access result is not allowed", Result_Definition
(N
));
1953 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1956 AD
: constant Node_Id
:=
1957 Access_To_Subprogram_Definition
(Result_Definition
(N
));
1959 if Present
(AD
) and then Protected_Present
(AD
) then
1960 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
1962 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1966 Set_Parent
(Typ
, Result_Definition
(N
));
1967 Set_Is_Local_Anonymous_Access
(Typ
);
1968 Set_Etype
(Designator
, Typ
);
1970 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1972 Null_Exclusion_Static_Checks
(N
);
1974 -- Subtype_Mark case
1977 Find_Type
(Result_Definition
(N
));
1978 Typ
:= Entity
(Result_Definition
(N
));
1979 Set_Etype
(Designator
, Typ
);
1981 -- Unconstrained array as result is not allowed in SPARK
1983 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
1984 Check_SPARK_05_Restriction
1985 ("returning an unconstrained array is not allowed",
1986 Result_Definition
(N
));
1989 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1991 Null_Exclusion_Static_Checks
(N
);
1993 -- If a null exclusion is imposed on the result type, then create
1994 -- a null-excluding itype (an access subtype) and use it as the
1995 -- function's Etype. Note that the null exclusion checks are done
1996 -- right before this, because they don't get applied to types that
1997 -- do not come from source.
1999 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2000 Set_Etype
(Designator
,
2001 Create_Null_Excluding_Itype
2004 Scope_Id
=> Scope
(Current_Scope
)));
2006 -- The new subtype must be elaborated before use because
2007 -- it is visible outside of the function. However its base
2008 -- type may not be frozen yet, so the reference that will
2009 -- force elaboration must be attached to the freezing of
2012 -- If the return specification appears on a proper body,
2013 -- the subtype will have been created already on the spec.
2015 if Is_Frozen
(Typ
) then
2016 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2017 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2021 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2025 Ensure_Freeze_Node
(Typ
);
2028 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2030 Set_Itype
(IR
, Etype
(Designator
));
2031 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2036 Set_Etype
(Designator
, Typ
);
2039 if Ekind
(Typ
) = E_Incomplete_Type
2040 and then Is_Value_Type
(Typ
)
2044 elsif Ekind
(Typ
) = E_Incomplete_Type
2045 or else (Is_Class_Wide_Type
(Typ
)
2046 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2048 -- AI05-0151: Tagged incomplete types are allowed in all formal
2049 -- parts. Untagged incomplete types are not allowed in bodies.
2050 -- As a consequence, limited views cannot appear in a basic
2051 -- declaration that is itself within a body, because there is
2052 -- no point at which the non-limited view will become visible.
2054 if Ada_Version
>= Ada_2012
then
2055 if From_Limited_With
(Typ
) and then In_Package_Body
then
2057 ("invalid use of incomplete type&",
2058 Result_Definition
(N
), Typ
);
2060 -- The return type of a subprogram body cannot be of a
2061 -- formal incomplete type.
2063 elsif Is_Generic_Type
(Typ
)
2064 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2067 ("return type cannot be a formal incomplete type",
2068 Result_Definition
(N
));
2070 elsif Is_Class_Wide_Type
(Typ
)
2071 and then Is_Generic_Type
(Root_Type
(Typ
))
2072 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2075 ("return type cannot be a formal incomplete type",
2076 Result_Definition
(N
));
2078 elsif Is_Tagged_Type
(Typ
) then
2081 -- Use is legal in a thunk generated for an operation
2082 -- inherited from a progenitor.
2084 elsif Is_Thunk
(Designator
)
2085 and then Present
(Non_Limited_View
(Typ
))
2089 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2090 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2094 ("invalid use of untagged incomplete type&",
2098 -- The type must be completed in the current package. This
2099 -- is checked at the end of the package declaration when
2100 -- Taft-amendment types are identified. If the return type
2101 -- is class-wide, there is no required check, the type can
2102 -- be a bona fide TAT.
2104 if Ekind
(Scope
(Current_Scope
)) = E_Package
2105 and then In_Private_Part
(Scope
(Current_Scope
))
2106 and then not Is_Class_Wide_Type
(Typ
)
2108 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2113 ("invalid use of incomplete type&", Designator
, Typ
);
2118 -- Case where result definition does indicate an error
2121 Set_Etype
(Designator
, Any_Type
);
2123 end Analyze_Return_Type
;
2125 -----------------------------
2126 -- Analyze_Subprogram_Body --
2127 -----------------------------
2129 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2130 Loc
: constant Source_Ptr
:= Sloc
(N
);
2131 Body_Spec
: constant Node_Id
:= Specification
(N
);
2132 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2135 if Debug_Flag_C
then
2136 Write_Str
("==> subprogram body ");
2137 Write_Name
(Chars
(Body_Id
));
2138 Write_Str
(" from ");
2139 Write_Location
(Loc
);
2144 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2146 -- The real work is split out into the helper, so it can do "return;"
2147 -- without skipping the debug output:
2149 Analyze_Subprogram_Body_Helper
(N
);
2151 if Debug_Flag_C
then
2153 Write_Str
("<== subprogram body ");
2154 Write_Name
(Chars
(Body_Id
));
2155 Write_Str
(" from ");
2156 Write_Location
(Loc
);
2159 end Analyze_Subprogram_Body
;
2161 --------------------------------------
2162 -- Analyze_Subprogram_Body_Contract --
2163 --------------------------------------
2165 procedure Analyze_Subprogram_Body_Contract
(Body_Id
: Entity_Id
) is
2166 Items
: constant Node_Id
:= Contract
(Body_Id
);
2167 Mode
: SPARK_Mode_Type
;
2170 Ref_Depends
: Node_Id
:= Empty
;
2171 Ref_Global
: Node_Id
:= Empty
;
2174 -- When a subprogram body declaration is illegal, its defining entity is
2175 -- left unanalyzed. There is nothing left to do in this case because the
2176 -- body lacks a contract, or even a proper Ekind.
2178 if Ekind
(Body_Id
) = E_Void
then
2182 -- Due to the timing of contract analysis, delayed pragmas may be
2183 -- subject to the wrong SPARK_Mode, usually that of the enclosing
2184 -- context. To remedy this, restore the original SPARK_Mode of the
2185 -- related subprogram body.
2187 Save_SPARK_Mode_And_Set
(Body_Id
, Mode
);
2189 -- All subprograms carry a contract, but for some it is not significant
2190 -- and should not be processed.
2192 if not Has_Significant_Contract
(Body_Id
) then
2195 -- The subprogram body is a completion, analyze all delayed pragmas that
2196 -- apply. Note that when the body is stand alone, the pragmas are always
2197 -- analyzed on the spot.
2199 elsif Present
(Items
) then
2201 -- Locate and store pragmas Refined_Depends and Refined_Global since
2202 -- their order of analysis matters.
2204 Prag
:= Classifications
(Items
);
2205 while Present
(Prag
) loop
2206 Prag_Nam
:= Pragma_Name
(Prag
);
2208 if Prag_Nam
= Name_Refined_Depends
then
2209 Ref_Depends
:= Prag
;
2211 elsif Prag_Nam
= Name_Refined_Global
then
2215 Prag
:= Next_Pragma
(Prag
);
2218 -- Analyze Refined_Global first as Refined_Depends may mention items
2219 -- classified in the global refinement.
2221 if Present
(Ref_Global
) then
2222 Analyze_Refined_Global_In_Decl_Part
(Ref_Global
);
2225 -- Refined_Depends must be analyzed after Refined_Global in order to
2226 -- see the modes of all global refinements.
2228 if Present
(Ref_Depends
) then
2229 Analyze_Refined_Depends_In_Decl_Part
(Ref_Depends
);
2233 -- Ensure that the contract cases or postconditions mention 'Result or
2234 -- define a post-state.
2236 Check_Result_And_Post_State
(Body_Id
);
2238 -- Restore the SPARK_Mode of the enclosing context after all delayed
2239 -- pragmas have been analyzed.
2241 Restore_SPARK_Mode
(Mode
);
2242 end Analyze_Subprogram_Body_Contract
;
2244 ------------------------------------
2245 -- Analyze_Subprogram_Body_Helper --
2246 ------------------------------------
2248 -- This procedure is called for regular subprogram bodies, generic bodies,
2249 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2250 -- specification matters, and is used to create a proper declaration for
2251 -- the subprogram, or to perform conformance checks.
2253 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2254 Loc
: constant Source_Ptr
:= Sloc
(N
);
2255 Body_Spec
: Node_Id
:= Specification
(N
);
2256 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2257 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2258 Conformant
: Boolean;
2260 Prot_Typ
: Entity_Id
:= Empty
;
2261 Spec_Id
: Entity_Id
;
2262 Spec_Decl
: Node_Id
:= Empty
;
2264 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2265 -- When we analyze a separate spec, the entity chain ends up containing
2266 -- the formals, as well as any itypes generated during analysis of the
2267 -- default expressions for parameters, or the arguments of associated
2268 -- precondition/postcondition pragmas (which are analyzed in the context
2269 -- of the spec since they have visibility on formals).
2271 -- These entities belong with the spec and not the body. However we do
2272 -- the analysis of the body in the context of the spec (again to obtain
2273 -- visibility to the formals), and all the entities generated during
2274 -- this analysis end up also chained to the entity chain of the spec.
2275 -- But they really belong to the body, and there is circuitry to move
2276 -- them from the spec to the body.
2278 -- However, when we do this move, we don't want to move the real spec
2279 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2280 -- variable points to the last real spec entity, so we only move those
2281 -- chained beyond that point. It is initialized to Empty to deal with
2282 -- the case where there is no separate spec.
2284 function Body_Has_Contract
return Boolean;
2285 -- Check whether unanalyzed body has an aspect or pragma that may
2286 -- generate a SPARK contract.
2288 procedure Build_Subprogram_Declaration
;
2289 -- Create a matching subprogram declaration for subprogram body N
2291 procedure Check_Anonymous_Return
;
2292 -- Ada 2005: if a function returns an access type that denotes a task,
2293 -- or a type that contains tasks, we must create a master entity for
2294 -- the anonymous type, which typically will be used in an allocator
2295 -- in the body of the function.
2297 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2298 -- Look ahead to recognize a pragma that may appear after the body.
2299 -- If there is a previous spec, check that it appears in the same
2300 -- declarative part. If the pragma is Inline_Always, perform inlining
2301 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2302 -- If the body acts as a spec, and inlining is required, we create a
2303 -- subprogram declaration for it, in order to attach the body to inline.
2304 -- If pragma does not appear after the body, check whether there is
2305 -- an inline pragma before any local declarations.
2307 procedure Check_Missing_Return
;
2308 -- Checks for a function with a no return statements, and also performs
2309 -- the warning checks implemented by Check_Returns. In formal mode, also
2310 -- verify that a function ends with a RETURN and that a procedure does
2311 -- not contain any RETURN.
2313 function Disambiguate_Spec
return Entity_Id
;
2314 -- When a primitive is declared between the private view and the full
2315 -- view of a concurrent type which implements an interface, a special
2316 -- mechanism is used to find the corresponding spec of the primitive
2319 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
);
2320 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2321 -- incomplete types coming from a limited context and swap their limited
2322 -- views with the non-limited ones.
2324 function Is_Private_Concurrent_Primitive
2325 (Subp_Id
: Entity_Id
) return Boolean;
2326 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2327 -- type that implements an interface and has a private view.
2329 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2330 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2331 -- subprogram whose body is being analyzed. N is the statement node
2332 -- causing the flag to be set, if the following statement is a return
2333 -- of an entity, we mark the entity as set in source to suppress any
2334 -- warning on the stylized use of function stubs with a dummy return.
2336 procedure Verify_Overriding_Indicator
;
2337 -- If there was a previous spec, the entity has been entered in the
2338 -- current scope previously. If the body itself carries an overriding
2339 -- indicator, check that it is consistent with the known status of the
2342 -----------------------
2343 -- Body_Has_Contract --
2344 -----------------------
2346 function Body_Has_Contract
return Boolean is
2347 Decls
: constant List_Id
:= Declarations
(N
);
2351 -- Check for unanalyzed aspects in the body that will generate a
2354 if Present
(Aspect_Specifications
(N
)) then
2355 Item
:= First
(Aspect_Specifications
(N
));
2356 while Present
(Item
) loop
2357 if Is_Contract_Annotation
(Item
) then
2365 -- Check for pragmas that may generate a contract
2367 if Present
(Decls
) then
2368 Item
:= First
(Decls
);
2369 while Present
(Item
) loop
2370 if Nkind
(Item
) = N_Pragma
2371 and then Is_Contract_Annotation
(Item
)
2381 end Body_Has_Contract
;
2383 ----------------------------------
2384 -- Build_Subprogram_Declaration --
2385 ----------------------------------
2387 procedure Build_Subprogram_Declaration
is
2390 Subp_Decl
: Node_Id
;
2393 -- Create a matching subprogram spec using the profile of the body.
2394 -- The structure of the tree is identical, but has new entities for
2395 -- the defining unit name and formal parameters.
2398 Make_Subprogram_Declaration
(Loc
,
2399 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2401 -- Relocate the aspects of the subprogram body to the new subprogram
2402 -- spec because it acts as the initial declaration.
2403 -- ??? what about pragmas
2405 Move_Aspects
(N
, To
=> Subp_Decl
);
2406 Insert_Before_And_Analyze
(N
, Subp_Decl
);
2408 -- The analysis of the subprogram spec aspects may introduce pragmas
2409 -- that need to be analyzed.
2411 Decl
:= Next
(Subp_Decl
);
2412 while Present
(Decl
) loop
2414 -- Stop the search for pragmas once the body has been reached as
2415 -- this terminates the region where pragmas may appear.
2420 elsif Nkind
(Decl
) = N_Pragma
then
2427 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2428 Set_Corresponding_Spec
(N
, Spec_Id
);
2430 -- Mark the generated spec as a source construct to ensure that all
2431 -- calls to it are properly registered in ALI files for GNATprove.
2433 Set_Comes_From_Source
(Spec_Id
, True);
2435 -- If aspect SPARK_Mode was specified on the body, it needs to be
2436 -- repeated both on the generated spec and the body.
2438 Asp
:= Find_Aspect
(Spec_Id
, Aspect_SPARK_Mode
);
2440 if Present
(Asp
) then
2441 Asp
:= New_Copy_Tree
(Asp
);
2442 Set_Analyzed
(Asp
, False);
2443 Set_Aspect_Specifications
(N
, New_List
(Asp
));
2446 -- Ensure that the specs of the subprogram declaration and its body
2447 -- are identical, otherwise they will appear non-conformant due to
2448 -- rewritings in the default values of formal parameters.
2450 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2451 Set_Specification
(N
, Body_Spec
);
2452 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2453 end Build_Subprogram_Declaration
;
2455 ----------------------------
2456 -- Check_Anonymous_Return --
2457 ----------------------------
2459 procedure Check_Anonymous_Return
is
2465 if Present
(Spec_Id
) then
2471 if Ekind
(Scop
) = E_Function
2472 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2473 and then not Is_Thunk
(Scop
)
2475 -- Skip internally built functions which handle the case of
2476 -- a null access (see Expand_Interface_Conversion)
2478 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2479 and then not Comes_From_Source
(Parent
(Scop
)))
2481 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2483 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2485 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2486 and then Expander_Active
2488 -- Avoid cases with no tasking support
2490 and then RTE_Available
(RE_Current_Master
)
2491 and then not Restriction_Active
(No_Task_Hierarchy
)
2494 Make_Object_Declaration
(Loc
,
2495 Defining_Identifier
=>
2496 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2497 Constant_Present
=> True,
2498 Object_Definition
=>
2499 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2501 Make_Explicit_Dereference
(Loc
,
2502 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2504 if Present
(Declarations
(N
)) then
2505 Prepend
(Decl
, Declarations
(N
));
2507 Set_Declarations
(N
, New_List
(Decl
));
2510 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2511 Set_Has_Master_Entity
(Scop
);
2513 -- Now mark the containing scope as a task master
2516 while Nkind
(Par
) /= N_Compilation_Unit
loop
2517 Par
:= Parent
(Par
);
2518 pragma Assert
(Present
(Par
));
2520 -- If we fall off the top, we are at the outer level, and
2521 -- the environment task is our effective master, so nothing
2525 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2527 Set_Is_Task_Master
(Par
, True);
2532 end Check_Anonymous_Return
;
2534 -------------------------
2535 -- Check_Inline_Pragma --
2536 -------------------------
2538 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2542 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2543 -- True when N is a pragma Inline or Inline_Always that applies
2544 -- to this subprogram.
2546 -----------------------
2547 -- Is_Inline_Pragma --
2548 -----------------------
2550 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2553 Nkind
(N
) = N_Pragma
2555 (Pragma_Name
(N
) = Name_Inline_Always
2556 or else (Front_End_Inlining
2557 and then Pragma_Name
(N
) = Name_Inline
))
2560 (Expression
(First
(Pragma_Argument_Associations
(N
)))) =
2562 end Is_Inline_Pragma
;
2564 -- Start of processing for Check_Inline_Pragma
2567 if not Expander_Active
then
2571 if Is_List_Member
(N
)
2572 and then Present
(Next
(N
))
2573 and then Is_Inline_Pragma
(Next
(N
))
2577 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2578 and then Present
(Declarations
(N
))
2579 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2581 Prag
:= First
(Declarations
(N
));
2587 if Present
(Prag
) then
2588 if Present
(Spec_Id
) then
2589 if In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
)) then
2594 -- Create a subprogram declaration, to make treatment uniform
2597 Subp
: constant Entity_Id
:=
2598 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
2599 Decl
: constant Node_Id
:=
2600 Make_Subprogram_Declaration
(Loc
,
2602 New_Copy_Tree
(Specification
(N
)));
2605 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2607 if Present
(First_Formal
(Body_Id
)) then
2608 Plist
:= Copy_Parameter_List
(Body_Id
);
2609 Set_Parameter_Specifications
2610 (Specification
(Decl
), Plist
);
2613 Insert_Before
(N
, Decl
);
2616 Set_Has_Pragma_Inline
(Subp
);
2618 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2619 Set_Is_Inlined
(Subp
);
2620 Set_Has_Pragma_Inline_Always
(Subp
);
2623 -- Prior to copying the subprogram body to create a template
2624 -- for it for subsequent inlining, remove the pragma from
2625 -- the current body so that the copy that will produce the
2626 -- new body will start from a completely unanalyzed tree.
2628 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2629 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2636 end Check_Inline_Pragma
;
2638 --------------------------
2639 -- Check_Missing_Return --
2640 --------------------------
2642 procedure Check_Missing_Return
is
2644 Missing_Ret
: Boolean;
2647 if Nkind
(Body_Spec
) = N_Function_Specification
then
2648 if Present
(Spec_Id
) then
2654 if Return_Present
(Id
) then
2655 Check_Returns
(HSS
, 'F', Missing_Ret
);
2658 Set_Has_Missing_Return
(Id
);
2661 elsif Is_Generic_Subprogram
(Id
)
2662 or else not Is_Machine_Code_Subprogram
(Id
)
2664 Error_Msg_N
("missing RETURN statement in function body", N
);
2667 -- If procedure with No_Return, check returns
2669 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2670 and then Present
(Spec_Id
)
2671 and then No_Return
(Spec_Id
)
2673 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2676 -- Special checks in SPARK mode
2678 if Nkind
(Body_Spec
) = N_Function_Specification
then
2680 -- In SPARK mode, last statement of a function should be a return
2683 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
2686 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
2687 N_Extended_Return_Statement
)
2689 Check_SPARK_05_Restriction
2690 ("last statement in function should be RETURN", Stat
);
2694 -- In SPARK mode, verify that a procedure has no return
2696 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
2697 if Present
(Spec_Id
) then
2703 -- Would be nice to point to return statement here, can we
2704 -- borrow the Check_Returns procedure here ???
2706 if Return_Present
(Id
) then
2707 Check_SPARK_05_Restriction
2708 ("procedure should not have RETURN", N
);
2711 end Check_Missing_Return
;
2713 -----------------------
2714 -- Disambiguate_Spec --
2715 -----------------------
2717 function Disambiguate_Spec
return Entity_Id
is
2718 Priv_Spec
: Entity_Id
;
2721 procedure Replace_Types
(To_Corresponding
: Boolean);
2722 -- Depending on the flag, replace the type of formal parameters of
2723 -- Body_Id if it is a concurrent type implementing interfaces with
2724 -- the corresponding record type or the other way around.
2726 procedure Replace_Types
(To_Corresponding
: Boolean) is
2728 Formal_Typ
: Entity_Id
;
2731 Formal
:= First_Formal
(Body_Id
);
2732 while Present
(Formal
) loop
2733 Formal_Typ
:= Etype
(Formal
);
2735 if Is_Class_Wide_Type
(Formal_Typ
) then
2736 Formal_Typ
:= Root_Type
(Formal_Typ
);
2739 -- From concurrent type to corresponding record
2741 if To_Corresponding
then
2742 if Is_Concurrent_Type
(Formal_Typ
)
2743 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2746 (Corresponding_Record_Type
(Formal_Typ
)))
2749 Corresponding_Record_Type
(Formal_Typ
));
2752 -- From corresponding record to concurrent type
2755 if Is_Concurrent_Record_Type
(Formal_Typ
)
2756 and then Present
(Interfaces
(Formal_Typ
))
2759 Corresponding_Concurrent_Type
(Formal_Typ
));
2763 Next_Formal
(Formal
);
2767 -- Start of processing for Disambiguate_Spec
2770 -- Try to retrieve the specification of the body as is. All error
2771 -- messages are suppressed because the body may not have a spec in
2772 -- its current state.
2774 Spec_N
:= Find_Corresponding_Spec
(N
, False);
2776 -- It is possible that this is the body of a primitive declared
2777 -- between a private and a full view of a concurrent type. The
2778 -- controlling parameter of the spec carries the concurrent type,
2779 -- not the corresponding record type as transformed by Analyze_
2780 -- Subprogram_Specification. In such cases, we undo the change
2781 -- made by the analysis of the specification and try to find the
2784 -- Note that wrappers already have their corresponding specs and
2785 -- bodies set during their creation, so if the candidate spec is
2786 -- a wrapper, then we definitely need to swap all types to their
2787 -- original concurrent status.
2790 or else Is_Primitive_Wrapper
(Spec_N
)
2792 -- Restore all references of corresponding record types to the
2793 -- original concurrent types.
2795 Replace_Types
(To_Corresponding
=> False);
2796 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
2798 -- The current body truly belongs to a primitive declared between
2799 -- a private and a full view. We leave the modified body as is,
2800 -- and return the true spec.
2802 if Present
(Priv_Spec
)
2803 and then Is_Private_Primitive
(Priv_Spec
)
2808 -- In case that this is some sort of error, restore the original
2809 -- state of the body.
2811 Replace_Types
(To_Corresponding
=> True);
2815 end Disambiguate_Spec
;
2817 ----------------------------
2818 -- Exchange_Limited_Views --
2819 ----------------------------
2821 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
) is
2822 procedure Detect_And_Exchange
(Id
: Entity_Id
);
2823 -- Determine whether Id's type denotes an incomplete type associated
2824 -- with a limited with clause and exchange the limited view with the
2825 -- non-limited one when available.
2827 -------------------------
2828 -- Detect_And_Exchange --
2829 -------------------------
2831 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
2832 Typ
: constant Entity_Id
:= Etype
(Id
);
2834 if From_Limited_With
(Typ
)
2835 and then Has_Non_Limited_View
(Typ
)
2837 Set_Etype
(Id
, Non_Limited_View
(Typ
));
2839 end Detect_And_Exchange
;
2845 -- Start of processing for Exchange_Limited_Views
2848 if No
(Subp_Id
) then
2851 -- Do not process subprogram bodies as they already use the non-
2852 -- limited view of types.
2854 elsif not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
2858 -- Examine all formals and swap views when applicable
2860 Formal
:= First_Formal
(Subp_Id
);
2861 while Present
(Formal
) loop
2862 Detect_And_Exchange
(Formal
);
2864 Next_Formal
(Formal
);
2867 -- Process the return type of a function
2869 if Ekind
(Subp_Id
) = E_Function
then
2870 Detect_And_Exchange
(Subp_Id
);
2872 end Exchange_Limited_Views
;
2874 -------------------------------------
2875 -- Is_Private_Concurrent_Primitive --
2876 -------------------------------------
2878 function Is_Private_Concurrent_Primitive
2879 (Subp_Id
: Entity_Id
) return Boolean
2881 Formal_Typ
: Entity_Id
;
2884 if Present
(First_Formal
(Subp_Id
)) then
2885 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
2887 if Is_Concurrent_Record_Type
(Formal_Typ
) then
2888 if Is_Class_Wide_Type
(Formal_Typ
) then
2889 Formal_Typ
:= Root_Type
(Formal_Typ
);
2892 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
2895 -- The type of the first formal is a concurrent tagged type with
2899 Is_Concurrent_Type
(Formal_Typ
)
2900 and then Is_Tagged_Type
(Formal_Typ
)
2901 and then Has_Private_Declaration
(Formal_Typ
);
2905 end Is_Private_Concurrent_Primitive
;
2907 ----------------------------
2908 -- Set_Trivial_Subprogram --
2909 ----------------------------
2911 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
2912 Nxt
: constant Node_Id
:= Next
(N
);
2915 Set_Is_Trivial_Subprogram
(Body_Id
);
2917 if Present
(Spec_Id
) then
2918 Set_Is_Trivial_Subprogram
(Spec_Id
);
2922 and then Nkind
(Nxt
) = N_Simple_Return_Statement
2923 and then No
(Next
(Nxt
))
2924 and then Present
(Expression
(Nxt
))
2925 and then Is_Entity_Name
(Expression
(Nxt
))
2927 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
2929 end Set_Trivial_Subprogram
;
2931 ---------------------------------
2932 -- Verify_Overriding_Indicator --
2933 ---------------------------------
2935 procedure Verify_Overriding_Indicator
is
2937 if Must_Override
(Body_Spec
) then
2938 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
2939 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
2943 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
2945 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
2947 -- Overriding indicators aren't allowed for protected subprogram
2948 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
2949 -- this to a warning if -gnatd.E is enabled.
2951 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
2952 Error_Msg_Warn
:= Error_To_Warning
;
2954 ("<<overriding indicator not allowed for protected "
2955 & "subprogram body", Body_Spec
);
2958 elsif Must_Not_Override
(Body_Spec
) then
2959 if Present
(Overridden_Operation
(Spec_Id
)) then
2961 ("subprogram& overrides inherited operation",
2962 Body_Spec
, Spec_Id
);
2964 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
2965 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
2968 ("subprogram& overrides predefined operator ",
2969 Body_Spec
, Spec_Id
);
2971 -- Overriding indicators aren't allowed for protected subprogram
2972 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
2973 -- this to a warning if -gnatd.E is enabled.
2975 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
2976 Error_Msg_Warn
:= Error_To_Warning
;
2979 ("<<overriding indicator not allowed "
2980 & "for protected subprogram body", Body_Spec
);
2982 -- If this is not a primitive operation, then the overriding
2983 -- indicator is altogether illegal.
2985 elsif not Is_Primitive
(Spec_Id
) then
2987 ("overriding indicator only allowed "
2988 & "if subprogram is primitive", Body_Spec
);
2991 -- If checking the style rule and the operation overrides, then
2992 -- issue a warning about a missing overriding_indicator. Protected
2993 -- subprogram bodies are excluded from this style checking, since
2994 -- they aren't primitives (even though their declarations can
2995 -- override) and aren't allowed to have an overriding_indicator.
2998 and then Present
(Overridden_Operation
(Spec_Id
))
2999 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3001 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3002 Style
.Missing_Overriding
(N
, Body_Id
);
3005 and then Can_Override_Operator
(Spec_Id
)
3006 and then not Is_Predefined_File_Name
3007 (Unit_File_Name
(Get_Source_Unit
(Spec_Id
)))
3009 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3010 Style
.Missing_Overriding
(N
, Body_Id
);
3012 end Verify_Overriding_Indicator
;
3014 -- Start of processing for Analyze_Subprogram_Body_Helper
3017 -- Generic subprograms are handled separately. They always have a
3018 -- generic specification. Determine whether current scope has a
3019 -- previous declaration.
3021 -- If the subprogram body is defined within an instance of the same
3022 -- name, the instance appears as a package renaming, and will be hidden
3023 -- within the subprogram.
3025 if Present
(Prev_Id
)
3026 and then not Is_Overloadable
(Prev_Id
)
3027 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3028 or else Comes_From_Source
(Prev_Id
))
3030 if Is_Generic_Subprogram
(Prev_Id
) then
3033 -- The corresponding spec may be subject to pragma Ghost with
3034 -- policy Ignore. Set the mode now to ensure that any nodes
3035 -- generated during analysis and expansion are properly flagged
3036 -- as ignored Ghost.
3038 Set_Ghost_Mode
(N
, Spec_Id
);
3039 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3040 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3042 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3044 if Nkind
(N
) = N_Subprogram_Body
then
3045 HSS
:= Handled_Statement_Sequence
(N
);
3046 Check_Missing_Return
;
3052 -- Previous entity conflicts with subprogram name. Attempting to
3053 -- enter name will post error.
3055 Enter_Name
(Body_Id
);
3059 -- Non-generic case, find the subprogram declaration, if one was seen,
3060 -- or enter new overloaded entity in the current scope. If the
3061 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3062 -- part of the context of one of its subunits. No need to redo the
3065 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3069 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3071 if Nkind
(N
) = N_Subprogram_Body_Stub
3072 or else No
(Corresponding_Spec
(N
))
3074 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3075 Spec_Id
:= Disambiguate_Spec
;
3077 -- The corresponding spec may be subject to pragma Ghost with
3078 -- policy Ignore. Set the mode now to ensure that any nodes
3079 -- generated during analysis and expansion are properly flagged
3080 -- as ignored Ghost.
3082 Set_Ghost_Mode
(N
, Spec_Id
);
3085 Spec_Id
:= Find_Corresponding_Spec
(N
);
3087 -- The corresponding spec may be subject to pragma Ghost with
3088 -- policy Ignore. Set the mode now to ensure that any nodes
3089 -- generated during analysis and expansion are properly flagged
3090 -- as ignored Ghost.
3092 Set_Ghost_Mode
(N
, Spec_Id
);
3094 -- In GNATprove mode, if the body has no previous spec, create
3095 -- one so that the inlining machinery can operate properly.
3096 -- Transfer aspects, if any, to the new spec, so that they
3097 -- are legal and can be processed ahead of the body.
3098 -- We make two copies of the given spec, one for the new
3099 -- declaration, and one for the body.
3101 if No
(Spec_Id
) and then GNATprove_Mode
3103 -- Inlining does not apply during pre-analysis of code
3105 and then Full_Analysis
3107 -- Inlining only applies to full bodies, not stubs
3109 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3111 -- Inlining only applies to bodies in the source code, not to
3112 -- those generated by the compiler. In particular, expression
3113 -- functions, whose body is generated by the compiler, are
3114 -- treated specially by GNATprove.
3116 and then Comes_From_Source
(Body_Id
)
3118 -- This cannot be done for a compilation unit, which is not
3119 -- in a context where we can insert a new spec.
3121 and then Is_List_Member
(N
)
3123 -- Inlining only applies to subprograms without contracts,
3124 -- as a contract is a sign that GNATprove should perform a
3125 -- modular analysis of the subprogram instead of a contextual
3126 -- analysis at each call site. The same test is performed in
3127 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3128 -- here in another form (because the contract has not
3129 -- been attached to the body) to avoid frontend errors in
3130 -- case pragmas are used instead of aspects, because the
3131 -- corresponding pragmas in the body would not be transferred
3132 -- to the spec, leading to legality errors.
3134 and then not Body_Has_Contract
3135 and then not Inside_A_Generic
3137 Build_Subprogram_Declaration
;
3141 -- If this is a duplicate body, no point in analyzing it
3143 if Error_Posted
(N
) then
3147 -- A subprogram body should cause freezing of its own declaration,
3148 -- but if there was no previous explicit declaration, then the
3149 -- subprogram will get frozen too late (there may be code within
3150 -- the body that depends on the subprogram having been frozen,
3151 -- such as uses of extra formals), so we force it to be frozen
3152 -- here. Same holds if the body and spec are compilation units.
3153 -- Finally, if the return type is an anonymous access to protected
3154 -- subprogram, it must be frozen before the body because its
3155 -- expansion has generated an equivalent type that is used when
3156 -- elaborating the body.
3158 -- An exception in the case of Ada 2012, AI05-177: The bodies
3159 -- created for expression functions do not freeze.
3162 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3164 Freeze_Before
(N
, Body_Id
);
3166 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3167 Freeze_Before
(N
, Spec_Id
);
3169 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3170 Freeze_Before
(N
, Etype
(Body_Id
));
3174 Spec_Id
:= Corresponding_Spec
(N
);
3176 -- The corresponding spec may be subject to pragma Ghost with
3177 -- policy Ignore. Set the mode now to ensure that any nodes
3178 -- generated during analysis and expansion are properly flagged
3179 -- as ignored Ghost.
3181 Set_Ghost_Mode
(N
, Spec_Id
);
3185 -- Previously we scanned the body to look for nested subprograms, and
3186 -- rejected an inline directive if nested subprograms were present,
3187 -- because the back-end would generate conflicting symbols for the
3188 -- nested bodies. This is now unnecessary.
3190 -- Look ahead to recognize a pragma Inline that appears after the body
3192 Check_Inline_Pragma
(Spec_Id
);
3194 -- Deal with special case of a fully private operation in the body of
3195 -- the protected type. We must create a declaration for the subprogram,
3196 -- in order to attach the protected subprogram that will be used in
3197 -- internal calls. We exclude compiler generated bodies from the
3198 -- expander since the issue does not arise for those cases.
3201 and then Comes_From_Source
(N
)
3202 and then Is_Protected_Type
(Current_Scope
)
3204 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3207 -- If a separate spec is present, then deal with freezing issues
3209 if Present
(Spec_Id
) then
3210 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3211 Verify_Overriding_Indicator
;
3213 -- In general, the spec will be frozen when we start analyzing the
3214 -- body. However, for internally generated operations, such as
3215 -- wrapper functions for inherited operations with controlling
3216 -- results, the spec may not have been frozen by the time we expand
3217 -- the freeze actions that include the bodies. In particular, extra
3218 -- formals for accessibility or for return-in-place may need to be
3219 -- generated. Freeze nodes, if any, are inserted before the current
3220 -- body. These freeze actions are also needed in ASIS mode to enable
3221 -- the proper back-annotations.
3223 if not Is_Frozen
(Spec_Id
)
3224 and then (Expander_Active
or ASIS_Mode
)
3226 -- Force the generation of its freezing node to ensure proper
3227 -- management of access types in the backend.
3229 -- This is definitely needed for some cases, but it is not clear
3230 -- why, to be investigated further???
3232 Set_Has_Delayed_Freeze
(Spec_Id
);
3233 Freeze_Before
(N
, Spec_Id
);
3237 -- Place subprogram on scope stack, and make formals visible. If there
3238 -- is a spec, the visible entity remains that of the spec.
3240 if Present
(Spec_Id
) then
3241 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3243 if Is_Child_Unit
(Spec_Id
) then
3244 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3248 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3251 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3252 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3254 if Is_Abstract_Subprogram
(Spec_Id
) then
3255 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3259 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3260 Set_Has_Completion
(Spec_Id
);
3262 -- Inherit the "ghostness" of the subprogram spec. Note that this
3263 -- property is not directly inherited as the body may be subject
3264 -- to a different Ghost assertion policy.
3266 if Is_Ghost_Entity
(Spec_Id
) or else Ghost_Mode
> None
then
3267 Set_Is_Ghost_Entity
(Body_Id
);
3269 -- The Ghost policy in effect at the point of declaration and
3270 -- at the point of completion must match (SPARK RM 6.9(14)).
3272 Check_Ghost_Completion
(Spec_Id
, Body_Id
);
3275 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3276 Prot_Typ
:= Scope
(Spec_Id
);
3279 -- If this is a body generated for a renaming, do not check for
3280 -- full conformance. The check is redundant, because the spec of
3281 -- the body is a copy of the spec in the renaming declaration,
3282 -- and the test can lead to spurious errors on nested defaults.
3284 if Present
(Spec_Decl
)
3285 and then not Comes_From_Source
(N
)
3287 (Nkind
(Original_Node
(Spec_Decl
)) =
3288 N_Subprogram_Renaming_Declaration
3289 or else (Present
(Corresponding_Body
(Spec_Decl
))
3291 Nkind
(Unit_Declaration_Node
3292 (Corresponding_Body
(Spec_Decl
))) =
3293 N_Subprogram_Renaming_Declaration
))
3297 -- Conversely, the spec may have been generated for specless body
3298 -- with an inline pragma.
3300 elsif Comes_From_Source
(N
)
3301 and then not Comes_From_Source
(Spec_Id
)
3302 and then Has_Pragma_Inline
(Spec_Id
)
3309 Fully_Conformant
, True, Conformant
, Body_Id
);
3312 -- If the body is not fully conformant, we have to decide if we
3313 -- should analyze it or not. If it has a really messed up profile
3314 -- then we probably should not analyze it, since we will get too
3315 -- many bogus messages.
3317 -- Our decision is to go ahead in the non-fully conformant case
3318 -- only if it is at least mode conformant with the spec. Note
3319 -- that the call to Check_Fully_Conformant has issued the proper
3320 -- error messages to complain about the lack of conformance.
3323 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3329 if Spec_Id
/= Body_Id
then
3330 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3333 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3335 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3336 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3341 Set_Corresponding_Spec
(N
, Spec_Id
);
3343 -- Ada 2005 (AI-345): If the operation is a primitive operation
3344 -- of a concurrent type, the type of the first parameter has been
3345 -- replaced with the corresponding record, which is the proper
3346 -- run-time structure to use. However, within the body there may
3347 -- be uses of the formals that depend on primitive operations
3348 -- of the type (in particular calls in prefixed form) for which
3349 -- we need the original concurrent type. The operation may have
3350 -- several controlling formals, so the replacement must be done
3353 if Comes_From_Source
(Spec_Id
)
3354 and then Present
(First_Entity
(Spec_Id
))
3355 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3356 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3357 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3358 and then Present
(Corresponding_Concurrent_Type
3359 (Etype
(First_Entity
(Spec_Id
))))
3362 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3366 Form
:= First_Formal
(Spec_Id
);
3367 while Present
(Form
) loop
3368 if Etype
(Form
) = Typ
then
3369 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3377 -- Make the formals visible, and place subprogram on scope stack.
3378 -- This is also the point at which we set Last_Real_Spec_Entity
3379 -- to mark the entities which will not be moved to the body.
3381 Install_Formals
(Spec_Id
);
3382 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3384 -- Within an instance, add local renaming declarations so that
3385 -- gdb can retrieve the values of actuals more easily. This is
3386 -- only relevant if generating code (and indeed we definitely
3387 -- do not want these definitions -gnatc mode, because that would
3390 if Is_Generic_Instance
(Spec_Id
)
3391 and then Is_Wrapper_Package
(Current_Scope
)
3392 and then Expander_Active
3394 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3397 Push_Scope
(Spec_Id
);
3399 -- Make sure that the subprogram is immediately visible. For
3400 -- child units that have no separate spec this is indispensable.
3401 -- Otherwise it is safe albeit redundant.
3403 Set_Is_Immediately_Visible
(Spec_Id
);
3406 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3407 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3408 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3410 -- Case of subprogram body with no previous spec
3413 -- Check for style warning required
3417 -- Only apply check for source level subprograms for which checks
3418 -- have not been suppressed.
3420 and then Comes_From_Source
(Body_Id
)
3421 and then not Suppress_Style_Checks
(Body_Id
)
3423 -- No warnings within an instance
3425 and then not In_Instance
3427 -- No warnings for expression functions
3429 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3431 Style
.Body_With_No_Spec
(N
);
3434 New_Overloaded_Entity
(Body_Id
);
3436 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3437 Set_Acts_As_Spec
(N
);
3438 Generate_Definition
(Body_Id
);
3440 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3441 Install_Formals
(Body_Id
);
3443 Push_Scope
(Body_Id
);
3446 -- For stubs and bodies with no previous spec, generate references to
3449 Generate_Reference_To_Formals
(Body_Id
);
3452 -- Set SPARK_Mode from context
3454 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
3455 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
3457 -- If the return type is an anonymous access type whose designated type
3458 -- is the limited view of a class-wide type and the non-limited view is
3459 -- available, update the return type accordingly.
3461 if Ada_Version
>= Ada_2005
and then Comes_From_Source
(N
) then
3467 Rtyp
:= Etype
(Current_Scope
);
3469 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
3470 Etyp
:= Directly_Designated_Type
(Rtyp
);
3472 if Is_Class_Wide_Type
(Etyp
)
3473 and then From_Limited_With
(Etyp
)
3475 Set_Directly_Designated_Type
3476 (Etype
(Current_Scope
), Available_View
(Etyp
));
3482 -- If this is the proper body of a stub, we must verify that the stub
3483 -- conforms to the body, and to the previous spec if one was present.
3484 -- We know already that the body conforms to that spec. This test is
3485 -- only required for subprograms that come from source.
3487 if Nkind
(Parent
(N
)) = N_Subunit
3488 and then Comes_From_Source
(N
)
3489 and then not Error_Posted
(Body_Id
)
3490 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
3491 N_Subprogram_Body_Stub
3494 Old_Id
: constant Entity_Id
:=
3496 (Specification
(Corresponding_Stub
(Parent
(N
))));
3498 Conformant
: Boolean := False;
3501 if No
(Spec_Id
) then
3502 Check_Fully_Conformant
(Body_Id
, Old_Id
);
3506 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
3508 if not Conformant
then
3510 -- The stub was taken to be a new declaration. Indicate that
3513 Set_Has_Completion
(Old_Id
, False);
3519 Set_Has_Completion
(Body_Id
);
3520 Check_Eliminated
(Body_Id
);
3522 -- Analyze any aspect specifications that appear on the subprogram body
3523 -- stub. Stop the analysis now as the stub does not have a declarative
3524 -- or a statement part, and it cannot be inlined.
3526 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3527 if Has_Aspects
(N
) then
3528 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
3534 -- Handle frontend inlining
3536 -- Note: Normally we don't do any inlining if expansion is off, since
3537 -- we won't generate code in any case. An exception arises in GNATprove
3538 -- mode where we want to expand some calls in place, even with expansion
3539 -- disabled, since the inlining eases formal verification.
3541 if not GNATprove_Mode
3542 and then Expander_Active
3543 and then Serious_Errors_Detected
= 0
3544 and then Present
(Spec_Id
)
3545 and then Has_Pragma_Inline
(Spec_Id
)
3547 -- Legacy implementation (relying on frontend inlining)
3549 if not Back_End_Inlining
then
3550 if (Has_Pragma_Inline_Always
(Spec_Id
)
3551 and then not Opt
.Disable_FE_Inline_Always
)
3553 (Has_Pragma_Inline
(Spec_Id
) and then Front_End_Inlining
3554 and then not Opt
.Disable_FE_Inline
)
3556 Build_Body_To_Inline
(N
, Spec_Id
);
3559 -- New implementation (relying on backend inlining)
3562 if Has_Pragma_Inline_Always
(Spec_Id
)
3563 or else Optimization_Level
> 0
3565 -- Handle function returning an unconstrained type
3567 if Comes_From_Source
(Body_Id
)
3568 and then Ekind
(Spec_Id
) = E_Function
3569 and then Returns_Unconstrained_Type
(Spec_Id
)
3571 -- If function builds in place, i.e. returns a limited type,
3572 -- inlining cannot be done.
3574 and then not Is_Limited_Type
(Etype
(Spec_Id
))
3576 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
3580 Subp_Body
: constant Node_Id
:=
3581 Unit_Declaration_Node
(Body_Id
);
3582 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
3585 -- Do not pass inlining to the backend if the subprogram
3586 -- has declarations or statements which cannot be inlined
3587 -- by the backend. This check is done here to emit an
3588 -- error instead of the generic warning message reported
3589 -- by the GCC backend (ie. "function might not be
3592 if Present
(Subp_Decl
)
3593 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
3597 elsif Has_Excluded_Statement
3600 (Handled_Statement_Sequence
(Subp_Body
)))
3604 -- If the backend inlining is available then at this
3605 -- stage we only have to mark the subprogram as inlined.
3606 -- The expander will take care of registering it in the
3607 -- table of subprograms inlined by the backend a part of
3608 -- processing calls to it (cf. Expand_Call)
3611 Set_Is_Inlined
(Spec_Id
);
3618 -- In GNATprove mode, inline only when there is a separate subprogram
3619 -- declaration for now, as inlining of subprogram bodies acting as
3620 -- declarations, or subprogram stubs, are not supported by frontend
3621 -- inlining. This inlining should occur after analysis of the body, so
3622 -- that it is known whether the value of SPARK_Mode applicable to the
3623 -- body, which can be defined by a pragma inside the body.
3625 elsif GNATprove_Mode
3626 and then Full_Analysis
3627 and then not Inside_A_Generic
3628 and then Present
(Spec_Id
)
3630 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
3631 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
3632 and then not Body_Has_Contract
3634 Build_Body_To_Inline
(N
, Spec_Id
);
3637 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
3638 -- of the specification we have to install the private withed units.
3639 -- This holds for child units as well.
3641 if Is_Compilation_Unit
(Body_Id
)
3642 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
3644 Install_Private_With_Clauses
(Body_Id
);
3647 Check_Anonymous_Return
;
3649 -- Set the Protected_Formal field of each extra formal of the protected
3650 -- subprogram to reference the corresponding extra formal of the
3651 -- subprogram that implements it. For regular formals this occurs when
3652 -- the protected subprogram's declaration is expanded, but the extra
3653 -- formals don't get created until the subprogram is frozen. We need to
3654 -- do this before analyzing the protected subprogram's body so that any
3655 -- references to the original subprogram's extra formals will be changed
3656 -- refer to the implementing subprogram's formals (see Expand_Formal).
3658 if Present
(Spec_Id
)
3659 and then Is_Protected_Type
(Scope
(Spec_Id
))
3660 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
3663 Impl_Subp
: constant Entity_Id
:=
3664 Protected_Body_Subprogram
(Spec_Id
);
3665 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
3666 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
3668 while Present
(Prot_Ext_Formal
) loop
3669 pragma Assert
(Present
(Impl_Ext_Formal
));
3670 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
3671 Next_Formal_With_Extras
(Prot_Ext_Formal
);
3672 Next_Formal_With_Extras
(Impl_Ext_Formal
);
3677 -- Now we can go on to analyze the body
3679 HSS
:= Handled_Statement_Sequence
(N
);
3680 Set_Actual_Subtypes
(N
, Current_Scope
);
3682 -- Add a declaration for the Protection object, renaming declarations
3683 -- for discriminals and privals and finally a declaration for the entry
3684 -- family index (if applicable). This form of early expansion is done
3685 -- when the Expander is active because Install_Private_Data_Declarations
3686 -- references entities which were created during regular expansion. The
3687 -- subprogram entity must come from source, and not be an internally
3688 -- generated subprogram.
3691 and then Present
(Prot_Typ
)
3692 and then Present
(Spec_Id
)
3693 and then Comes_From_Source
(Spec_Id
)
3694 and then not Is_Eliminated
(Spec_Id
)
3696 Install_Private_Data_Declarations
3697 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
3700 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
3701 -- may now appear in parameter and result profiles. Since the analysis
3702 -- of a subprogram body may use the parameter and result profile of the
3703 -- spec, swap any limited views with their non-limited counterpart.
3705 if Ada_Version
>= Ada_2012
then
3706 Exchange_Limited_Views
(Spec_Id
);
3709 -- Analyze any aspect specifications that appear on the subprogram body
3711 if Has_Aspects
(N
) then
3712 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
3715 Analyze_Declarations
(Declarations
(N
));
3717 -- Verify that the SPARK_Mode of the body agrees with that of its spec
3719 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
3720 if Present
(SPARK_Pragma
(Spec_Id
)) then
3721 if Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Spec_Id
)) = Off
3723 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
3725 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3726 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
3727 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
3729 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
3732 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
3736 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3737 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
3738 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
3740 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
3744 -- When a subprogram body appears inside a package, its contract is
3745 -- analyzed at the end of the package body declarations. This is due
3746 -- to the delay with respect of the package contract upon which the
3747 -- body contract may depend. When the subprogram body is stand alone
3748 -- and acts as a compilation unit, this delay is not necessary.
3750 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3751 Analyze_Subprogram_Body_Contract
(Body_Id
);
3754 -- Deal with preconditions, [refined] postconditions, Contract_Cases,
3755 -- invariants and predicates associated with body and its spec. Since
3756 -- there is no routine Expand_Declarations which would otherwise deal
3757 -- with the contract expansion, generate all necessary mechanisms to
3758 -- verify the contract assertions now.
3760 Expand_Subprogram_Contract
(N
);
3762 -- If SPARK_Mode for body is not On, disable frontend inlining for this
3763 -- subprogram in GNATprove mode, as its body should not be analyzed.
3766 and then GNATprove_Mode
3767 and then Present
(Spec_Id
)
3768 and then Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Declaration
3770 Set_Body_To_Inline
(Parent
(Parent
(Spec_Id
)), Empty
);
3771 Set_Is_Inlined_Always
(Spec_Id
, False);
3774 -- Check completion, and analyze the statements
3777 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
3780 -- Deal with end of scope processing for the body
3782 Process_End_Label
(HSS
, 't', Current_Scope
);
3784 Check_Subprogram_Order
(N
);
3785 Set_Analyzed
(Body_Id
);
3787 -- If we have a separate spec, then the analysis of the declarations
3788 -- caused the entities in the body to be chained to the spec id, but
3789 -- we want them chained to the body id. Only the formal parameters
3790 -- end up chained to the spec id in this case.
3792 if Present
(Spec_Id
) then
3794 -- We must conform to the categorization of our spec
3796 Validate_Categorization_Dependency
(N
, Spec_Id
);
3798 -- And if this is a child unit, the parent units must conform
3800 if Is_Child_Unit
(Spec_Id
) then
3801 Validate_Categorization_Dependency
3802 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
3805 -- Here is where we move entities from the spec to the body
3807 -- Case where there are entities that stay with the spec
3809 if Present
(Last_Real_Spec_Entity
) then
3811 -- No body entities (happens when the only real spec entities come
3812 -- from precondition and postcondition pragmas).
3814 if No
(Last_Entity
(Body_Id
)) then
3815 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
3817 -- Body entities present (formals), so chain stuff past them
3821 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
3824 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
3825 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3826 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
3828 -- Case where there are no spec entities, in this case there can be
3829 -- no body entities either, so just move everything.
3831 -- If the body is generated for an expression function, it may have
3832 -- been preanalyzed already, if 'access was applied to it.
3835 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
3836 N_Expression_Function
3838 pragma Assert
(No
(Last_Entity
(Body_Id
)));
3842 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
3843 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3844 Set_First_Entity
(Spec_Id
, Empty
);
3845 Set_Last_Entity
(Spec_Id
, Empty
);
3849 Check_Missing_Return
;
3851 -- Now we are going to check for variables that are never modified in
3852 -- the body of the procedure. But first we deal with a special case
3853 -- where we want to modify this check. If the body of the subprogram
3854 -- starts with a raise statement or its equivalent, or if the body
3855 -- consists entirely of a null statement, then it is pretty obvious that
3856 -- it is OK to not reference the parameters. For example, this might be
3857 -- the following common idiom for a stubbed function: statement of the
3858 -- procedure raises an exception. In particular this deals with the
3859 -- common idiom of a stubbed function, which appears something like:
3861 -- function F (A : Integer) return Some_Type;
3864 -- raise Program_Error;
3868 -- Here the purpose of X is simply to satisfy the annoying requirement
3869 -- in Ada that there be at least one return, and we certainly do not
3870 -- want to go posting warnings on X that it is not initialized. On
3871 -- the other hand, if X is entirely unreferenced that should still
3874 -- What we do is to detect these cases, and if we find them, flag the
3875 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
3876 -- suppress unwanted warnings. For the case of the function stub above
3877 -- we have a special test to set X as apparently assigned to suppress
3884 -- Skip initial labels (for one thing this occurs when we are in
3885 -- front end ZCX mode, but in any case it is irrelevant), and also
3886 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
3888 Stm
:= First
(Statements
(HSS
));
3889 while Nkind
(Stm
) = N_Label
3890 or else Nkind
(Stm
) in N_Push_xxx_Label
3895 -- Do the test on the original statement before expansion
3898 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
3901 -- If explicit raise statement, turn on flag
3903 if Nkind
(Ostm
) = N_Raise_Statement
then
3904 Set_Trivial_Subprogram
(Stm
);
3906 -- If null statement, and no following statements, turn on flag
3908 elsif Nkind
(Stm
) = N_Null_Statement
3909 and then Comes_From_Source
(Stm
)
3910 and then No
(Next
(Stm
))
3912 Set_Trivial_Subprogram
(Stm
);
3914 -- Check for explicit call cases which likely raise an exception
3916 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
3917 if Is_Entity_Name
(Name
(Ostm
)) then
3919 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
3922 -- If the procedure is marked No_Return, then likely it
3923 -- raises an exception, but in any case it is not coming
3924 -- back here, so turn on the flag.
3927 and then Ekind
(Ent
) = E_Procedure
3928 and then No_Return
(Ent
)
3930 Set_Trivial_Subprogram
(Stm
);
3938 -- Check for variables that are never modified
3944 -- If there is a separate spec, then transfer Never_Set_In_Source
3945 -- flags from out parameters to the corresponding entities in the
3946 -- body. The reason we do that is we want to post error flags on
3947 -- the body entities, not the spec entities.
3949 if Present
(Spec_Id
) then
3950 E1
:= First_Entity
(Spec_Id
);
3951 while Present
(E1
) loop
3952 if Ekind
(E1
) = E_Out_Parameter
then
3953 E2
:= First_Entity
(Body_Id
);
3954 while Present
(E2
) loop
3955 exit when Chars
(E1
) = Chars
(E2
);
3959 if Present
(E2
) then
3960 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
3968 -- Check references in body
3970 Check_References
(Body_Id
);
3973 -- Check for nested subprogram, and mark outer level subprogram if so
3979 if Present
(Spec_Id
) then
3986 Ent
:= Enclosing_Subprogram
(Ent
);
3987 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
3990 if Present
(Ent
) then
3991 Set_Has_Nested_Subprogram
(Ent
);
3994 end Analyze_Subprogram_Body_Helper
;
3996 ---------------------------------
3997 -- Analyze_Subprogram_Contract --
3998 ---------------------------------
4000 procedure Analyze_Subprogram_Contract
(Subp_Id
: Entity_Id
) is
4001 Items
: constant Node_Id
:= Contract
(Subp_Id
);
4002 Depends
: Node_Id
:= Empty
;
4003 Global
: Node_Id
:= Empty
;
4004 Mode
: SPARK_Mode_Type
;
4009 -- Due to the timing of contract analysis, delayed pragmas may be
4010 -- subject to the wrong SPARK_Mode, usually that of the enclosing
4011 -- context. To remedy this, restore the original SPARK_Mode of the
4012 -- related subprogram body.
4014 Save_SPARK_Mode_And_Set
(Subp_Id
, Mode
);
4016 -- All subprograms carry a contract, but for some it is not significant
4017 -- and should not be processed.
4019 if not Has_Significant_Contract
(Subp_Id
) then
4022 elsif Present
(Items
) then
4024 -- Analyze pre- and postconditions
4026 Prag
:= Pre_Post_Conditions
(Items
);
4027 while Present
(Prag
) loop
4028 Analyze_Pre_Post_Condition_In_Decl_Part
(Prag
);
4029 Prag
:= Next_Pragma
(Prag
);
4032 -- Analyze contract-cases and test-cases
4034 Prag
:= Contract_Test_Cases
(Items
);
4035 while Present
(Prag
) loop
4036 Prag_Nam
:= Pragma_Name
(Prag
);
4038 if Prag_Nam
= Name_Contract_Cases
then
4039 Analyze_Contract_Cases_In_Decl_Part
(Prag
);
4041 pragma Assert
(Prag_Nam
= Name_Test_Case
);
4042 Analyze_Test_Case_In_Decl_Part
(Prag
);
4045 Prag
:= Next_Pragma
(Prag
);
4048 -- Analyze classification pragmas
4050 Prag
:= Classifications
(Items
);
4051 while Present
(Prag
) loop
4052 Prag_Nam
:= Pragma_Name
(Prag
);
4054 if Prag_Nam
= Name_Depends
then
4057 elsif Prag_Nam
= Name_Global
then
4060 -- Note that pragma Extensions_Visible has already been analyzed
4064 Prag
:= Next_Pragma
(Prag
);
4067 -- Analyze Global first as Depends may mention items classified in
4068 -- the global categorization.
4070 if Present
(Global
) then
4071 Analyze_Global_In_Decl_Part
(Global
);
4074 -- Depends must be analyzed after Global in order to see the modes of
4075 -- all global items.
4077 if Present
(Depends
) then
4078 Analyze_Depends_In_Decl_Part
(Depends
);
4081 -- Ensure that the contract cases or postconditions mention 'Result
4082 -- or define a post-state.
4084 Check_Result_And_Post_State
(Subp_Id
);
4087 -- Restore the SPARK_Mode of the enclosing context after all delayed
4088 -- pragmas have been analyzed.
4090 Restore_SPARK_Mode
(Mode
);
4091 end Analyze_Subprogram_Contract
;
4093 ------------------------------------
4094 -- Analyze_Subprogram_Declaration --
4095 ------------------------------------
4097 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4098 Scop
: constant Entity_Id
:= Current_Scope
;
4099 Designator
: Entity_Id
;
4101 Is_Completion
: Boolean;
4102 -- Indicates whether a null procedure declaration is a completion
4105 -- The subprogram declaration may be subject to pragma Ghost with policy
4106 -- Ignore. Set the mode now to ensure that any nodes generated during
4107 -- analysis and expansion are properly flagged as ignored Ghost.
4111 -- Null procedures are not allowed in SPARK
4113 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4114 and then Null_Present
(Specification
(N
))
4116 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4118 -- Null procedures are allowed in protected types, following the
4119 -- recent AI12-0147.
4121 if Is_Protected_Type
(Current_Scope
)
4122 and then Ada_Version
< Ada_2012
4124 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4127 Analyze_Null_Procedure
(N
, Is_Completion
);
4129 if Is_Completion
then
4131 -- The null procedure acts as a body, nothing further is needed
4137 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4139 -- A reference may already have been generated for the unit name, in
4140 -- which case the following call is redundant. However it is needed for
4141 -- declarations that are the rewriting of an expression function.
4143 Generate_Definition
(Designator
);
4145 -- Set SPARK mode from current context (may be overwritten later with
4146 -- explicit pragma).
4148 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4149 Set_SPARK_Pragma_Inherited
(Designator
);
4151 -- A subprogram declared within a Ghost region is automatically Ghost
4152 -- (SPARK RM 6.9(2)).
4154 if Comes_From_Source
(Designator
) and then Ghost_Mode
> None
then
4155 Set_Is_Ghost_Entity
(Designator
);
4158 if Debug_Flag_C
then
4159 Write_Str
("==> subprogram spec ");
4160 Write_Name
(Chars
(Designator
));
4161 Write_Str
(" from ");
4162 Write_Location
(Sloc
(N
));
4167 Validate_RCI_Subprogram_Declaration
(N
);
4168 New_Overloaded_Entity
(Designator
);
4169 Check_Delayed_Subprogram
(Designator
);
4171 -- If the type of the first formal of the current subprogram is a non-
4172 -- generic tagged private type, mark the subprogram as being a private
4173 -- primitive. Ditto if this is a function with controlling result, and
4174 -- the return type is currently private. In both cases, the type of the
4175 -- controlling argument or result must be in the current scope for the
4176 -- operation to be primitive.
4178 if Has_Controlling_Result
(Designator
)
4179 and then Is_Private_Type
(Etype
(Designator
))
4180 and then Scope
(Etype
(Designator
)) = Current_Scope
4181 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4183 Set_Is_Private_Primitive
(Designator
);
4185 elsif Present
(First_Formal
(Designator
)) then
4187 Formal_Typ
: constant Entity_Id
:=
4188 Etype
(First_Formal
(Designator
));
4190 Set_Is_Private_Primitive
(Designator
,
4191 Is_Tagged_Type
(Formal_Typ
)
4192 and then Scope
(Formal_Typ
) = Current_Scope
4193 and then Is_Private_Type
(Formal_Typ
)
4194 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4198 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4201 if Ada_Version
>= Ada_2005
4202 and then Comes_From_Source
(N
)
4203 and then Is_Dispatching_Operation
(Designator
)
4210 if Has_Controlling_Result
(Designator
) then
4211 Etyp
:= Etype
(Designator
);
4214 E
:= First_Entity
(Designator
);
4216 and then Is_Formal
(E
)
4217 and then not Is_Controlling_Formal
(E
)
4225 if Is_Access_Type
(Etyp
) then
4226 Etyp
:= Directly_Designated_Type
(Etyp
);
4229 if Is_Interface
(Etyp
)
4230 and then not Is_Abstract_Subprogram
(Designator
)
4231 and then not (Ekind
(Designator
) = E_Procedure
4232 and then Null_Present
(Specification
(N
)))
4234 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4236 -- Specialize error message based on procedures vs. functions,
4237 -- since functions can't be null subprograms.
4239 if Ekind
(Designator
) = E_Procedure
then
4241 ("interface procedure % must be abstract or null", N
);
4244 ("interface function % must be abstract", N
);
4250 -- What is the following code for, it used to be
4252 -- ??? Set_Suppress_Elaboration_Checks
4253 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4255 -- The following seems equivalent, but a bit dubious
4257 if Elaboration_Checks_Suppressed
(Designator
) then
4258 Set_Kill_Elaboration_Checks
(Designator
);
4261 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4262 Set_Categorization_From_Scope
(Designator
, Scop
);
4265 -- For a compilation unit, check for library-unit pragmas
4267 Push_Scope
(Designator
);
4268 Set_Categorization_From_Pragmas
(N
);
4269 Validate_Categorization_Dependency
(N
, Designator
);
4273 -- For a compilation unit, set body required. This flag will only be
4274 -- reset if a valid Import or Interface pragma is processed later on.
4276 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4277 Set_Body_Required
(Parent
(N
), True);
4279 if Ada_Version
>= Ada_2005
4280 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4281 and then Null_Present
(Specification
(N
))
4284 ("null procedure cannot be declared at library level", N
);
4288 Generate_Reference_To_Formals
(Designator
);
4289 Check_Eliminated
(Designator
);
4291 if Debug_Flag_C
then
4293 Write_Str
("<== subprogram spec ");
4294 Write_Name
(Chars
(Designator
));
4295 Write_Str
(" from ");
4296 Write_Location
(Sloc
(N
));
4300 if Is_Protected_Type
(Current_Scope
) then
4302 -- Indicate that this is a protected operation, because it may be
4303 -- used in subsequent declarations within the protected type.
4305 Set_Convention
(Designator
, Convention_Protected
);
4308 List_Inherited_Pre_Post_Aspects
(Designator
);
4310 if Has_Aspects
(N
) then
4311 Analyze_Aspect_Specifications
(N
, Designator
);
4313 end Analyze_Subprogram_Declaration
;
4315 --------------------------------------
4316 -- Analyze_Subprogram_Specification --
4317 --------------------------------------
4319 -- Reminder: N here really is a subprogram specification (not a subprogram
4320 -- declaration). This procedure is called to analyze the specification in
4321 -- both subprogram bodies and subprogram declarations (specs).
4323 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4324 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4325 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4327 -- Start of processing for Analyze_Subprogram_Specification
4330 -- User-defined operator is not allowed in SPARK, except as a renaming
4332 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4333 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4335 Check_SPARK_05_Restriction
4336 ("user-defined operator is not allowed", N
);
4339 -- Proceed with analysis. Do not emit a cross-reference entry if the
4340 -- specification comes from an expression function, because it may be
4341 -- the completion of a previous declaration. It is is not, the cross-
4342 -- reference entry will be emitted for the new subprogram declaration.
4344 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4345 Generate_Definition
(Designator
);
4348 if Nkind
(N
) = N_Function_Specification
then
4349 Set_Ekind
(Designator
, E_Function
);
4350 Set_Mechanism
(Designator
, Default_Mechanism
);
4352 Set_Ekind
(Designator
, E_Procedure
);
4353 Set_Etype
(Designator
, Standard_Void_Type
);
4356 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4357 -- those subprograms which could be inlined in GNATprove mode (because
4358 -- Body_To_Inline is non-Empty) but cannot be inlined.
4360 if GNATprove_Mode
then
4361 Set_Is_Inlined_Always
(Designator
);
4364 -- Introduce new scope for analysis of the formals and the return type
4366 Set_Scope
(Designator
, Current_Scope
);
4368 if Present
(Formals
) then
4369 Push_Scope
(Designator
);
4370 Process_Formals
(Formals
, N
);
4372 -- Check dimensions in N for formals with default expression
4374 Analyze_Dimension_Formals
(N
, Formals
);
4376 -- Ada 2005 (AI-345): If this is an overriding operation of an
4377 -- inherited interface operation, and the controlling type is
4378 -- a synchronized type, replace the type with its corresponding
4379 -- record, to match the proper signature of an overriding operation.
4380 -- Same processing for an access parameter whose designated type is
4381 -- derived from a synchronized interface.
4383 if Ada_Version
>= Ada_2005
then
4386 Formal_Typ
: Entity_Id
;
4387 Rec_Typ
: Entity_Id
;
4388 Desig_Typ
: Entity_Id
;
4391 Formal
:= First_Formal
(Designator
);
4392 while Present
(Formal
) loop
4393 Formal_Typ
:= Etype
(Formal
);
4395 if Is_Concurrent_Type
(Formal_Typ
)
4396 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4398 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4400 if Present
(Interfaces
(Rec_Typ
)) then
4401 Set_Etype
(Formal
, Rec_Typ
);
4404 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4405 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4407 if Is_Concurrent_Type
(Desig_Typ
)
4408 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4410 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4412 if Present
(Interfaces
(Rec_Typ
)) then
4413 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
4418 Next_Formal
(Formal
);
4425 -- The subprogram scope is pushed and popped around the processing of
4426 -- the return type for consistency with call above to Process_Formals
4427 -- (which itself can call Analyze_Return_Type), and to ensure that any
4428 -- itype created for the return type will be associated with the proper
4431 elsif Nkind
(N
) = N_Function_Specification
then
4432 Push_Scope
(Designator
);
4433 Analyze_Return_Type
(N
);
4439 if Nkind
(N
) = N_Function_Specification
then
4441 -- Deal with operator symbol case
4443 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
4444 Valid_Operator_Definition
(Designator
);
4447 May_Need_Actuals
(Designator
);
4449 -- Ada 2005 (AI-251): If the return type is abstract, verify that
4450 -- the subprogram is abstract also. This does not apply to renaming
4451 -- declarations, where abstractness is inherited, and to subprogram
4452 -- bodies generated for stream operations, which become renamings as
4455 -- In case of primitives associated with abstract interface types
4456 -- the check is applied later (see Analyze_Subprogram_Declaration).
4458 if not Nkind_In
(Original_Node
(Parent
(N
)),
4459 N_Subprogram_Renaming_Declaration
,
4460 N_Abstract_Subprogram_Declaration
,
4461 N_Formal_Abstract_Subprogram_Declaration
)
4463 if Is_Abstract_Type
(Etype
(Designator
))
4464 and then not Is_Interface
(Etype
(Designator
))
4467 ("function that returns abstract type must be abstract", N
);
4469 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
4470 -- access result whose designated type is abstract.
4472 elsif Nkind
(Result_Definition
(N
)) = N_Access_Definition
4474 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
4475 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
4476 and then Ada_Version
>= Ada_2012
4478 Error_Msg_N
("function whose access result designates "
4479 & "abstract type must be abstract", N
);
4485 end Analyze_Subprogram_Specification
;
4487 -----------------------
4488 -- Check_Conformance --
4489 -----------------------
4491 procedure Check_Conformance
4492 (New_Id
: Entity_Id
;
4494 Ctype
: Conformance_Type
;
4496 Conforms
: out Boolean;
4497 Err_Loc
: Node_Id
:= Empty
;
4498 Get_Inst
: Boolean := False;
4499 Skip_Controlling_Formals
: Boolean := False)
4501 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
4502 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
4503 -- If Errmsg is True, then processing continues to post an error message
4504 -- for conformance error on given node. Two messages are output. The
4505 -- first message points to the previous declaration with a general "no
4506 -- conformance" message. The second is the detailed reason, supplied as
4507 -- Msg. The parameter N provide information for a possible & insertion
4508 -- in the message, and also provides the location for posting the
4509 -- message in the absence of a specified Err_Loc location.
4511 -----------------------
4512 -- Conformance_Error --
4513 -----------------------
4515 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
4522 if No
(Err_Loc
) then
4528 Error_Msg_Sloc
:= Sloc
(Old_Id
);
4531 when Type_Conformant
=>
4532 Error_Msg_N
-- CODEFIX
4533 ("not type conformant with declaration#!", Enode
);
4535 when Mode_Conformant
=>
4536 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4538 ("not mode conformant with operation inherited#!",
4542 ("not mode conformant with declaration#!", Enode
);
4545 when Subtype_Conformant
=>
4546 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4548 ("not subtype conformant with operation inherited#!",
4552 ("not subtype conformant with declaration#!", Enode
);
4555 when Fully_Conformant
=>
4556 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4557 Error_Msg_N
-- CODEFIX
4558 ("not fully conformant with operation inherited#!",
4561 Error_Msg_N
-- CODEFIX
4562 ("not fully conformant with declaration#!", Enode
);
4566 Error_Msg_NE
(Msg
, Enode
, N
);
4568 end Conformance_Error
;
4572 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
4573 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
4574 Old_Formal
: Entity_Id
;
4575 New_Formal
: Entity_Id
;
4576 Access_Types_Match
: Boolean;
4577 Old_Formal_Base
: Entity_Id
;
4578 New_Formal_Base
: Entity_Id
;
4580 -- Start of processing for Check_Conformance
4585 -- We need a special case for operators, since they don't appear
4588 if Ctype
= Type_Conformant
then
4589 if Ekind
(New_Id
) = E_Operator
4590 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
4596 -- If both are functions/operators, check return types conform
4598 if Old_Type
/= Standard_Void_Type
4600 New_Type
/= Standard_Void_Type
4602 -- If we are checking interface conformance we omit controlling
4603 -- arguments and result, because we are only checking the conformance
4604 -- of the remaining parameters.
4606 if Has_Controlling_Result
(Old_Id
)
4607 and then Has_Controlling_Result
(New_Id
)
4608 and then Skip_Controlling_Formals
4612 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
4613 if Ctype
>= Subtype_Conformant
4614 and then not Predicates_Match
(Old_Type
, New_Type
)
4617 ("\predicate of return type does not match!", New_Id
);
4620 ("\return type does not match!", New_Id
);
4626 -- Ada 2005 (AI-231): In case of anonymous access types check the
4627 -- null-exclusion and access-to-constant attributes match.
4629 if Ada_Version
>= Ada_2005
4630 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
4632 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
4633 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
4634 Is_Access_Constant
(Etype
(New_Type
)))
4636 Conformance_Error
("\return type does not match!", New_Id
);
4640 -- If either is a function/operator and the other isn't, error
4642 elsif Old_Type
/= Standard_Void_Type
4643 or else New_Type
/= Standard_Void_Type
4645 Conformance_Error
("\functions can only match functions!", New_Id
);
4649 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
4650 -- If this is a renaming as body, refine error message to indicate that
4651 -- the conflict is with the original declaration. If the entity is not
4652 -- frozen, the conventions don't have to match, the one of the renamed
4653 -- entity is inherited.
4655 if Ctype
>= Subtype_Conformant
then
4656 if Convention
(Old_Id
) /= Convention
(New_Id
) then
4657 if not Is_Frozen
(New_Id
) then
4660 elsif Present
(Err_Loc
)
4661 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
4662 and then Present
(Corresponding_Spec
(Err_Loc
))
4664 Error_Msg_Name_1
:= Chars
(New_Id
);
4666 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
4667 Conformance_Error
("\prior declaration for% has convention %!");
4670 Conformance_Error
("\calling conventions do not match!");
4675 elsif Is_Formal_Subprogram
(Old_Id
)
4676 or else Is_Formal_Subprogram
(New_Id
)
4678 Conformance_Error
("\formal subprograms not allowed!");
4681 -- Pragma Ghost behaves as a convention in the context of subtype
4682 -- conformance (SPARK RM 6.9(5)). Do not check internally generated
4683 -- subprograms as their spec may reside in a Ghost region and their
4684 -- body not, or vice versa.
4686 elsif Comes_From_Source
(Old_Id
)
4687 and then Comes_From_Source
(New_Id
)
4688 and then Is_Ghost_Entity
(Old_Id
) /= Is_Ghost_Entity
(New_Id
)
4690 Conformance_Error
("\ghost modes do not match!");
4695 -- Deal with parameters
4697 -- Note: we use the entity information, rather than going directly
4698 -- to the specification in the tree. This is not only simpler, but
4699 -- absolutely necessary for some cases of conformance tests between
4700 -- operators, where the declaration tree simply does not exist.
4702 Old_Formal
:= First_Formal
(Old_Id
);
4703 New_Formal
:= First_Formal
(New_Id
);
4704 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
4705 if Is_Controlling_Formal
(Old_Formal
)
4706 and then Is_Controlling_Formal
(New_Formal
)
4707 and then Skip_Controlling_Formals
4709 -- The controlling formals will have different types when
4710 -- comparing an interface operation with its match, but both
4711 -- or neither must be access parameters.
4713 if Is_Access_Type
(Etype
(Old_Formal
))
4715 Is_Access_Type
(Etype
(New_Formal
))
4717 goto Skip_Controlling_Formal
;
4720 ("\access parameter does not match!", New_Formal
);
4724 -- Ada 2012: Mode conformance also requires that formal parameters
4725 -- be both aliased, or neither.
4727 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
4728 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
4730 ("\aliased parameter mismatch!", New_Formal
);
4734 if Ctype
= Fully_Conformant
then
4736 -- Names must match. Error message is more accurate if we do
4737 -- this before checking that the types of the formals match.
4739 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
4740 Conformance_Error
("\name& does not match!", New_Formal
);
4742 -- Set error posted flag on new formal as well to stop
4743 -- junk cascaded messages in some cases.
4745 Set_Error_Posted
(New_Formal
);
4749 -- Null exclusion must match
4751 if Null_Exclusion_Present
(Parent
(Old_Formal
))
4753 Null_Exclusion_Present
(Parent
(New_Formal
))
4755 -- Only give error if both come from source. This should be
4756 -- investigated some time, since it should not be needed ???
4758 if Comes_From_Source
(Old_Formal
)
4760 Comes_From_Source
(New_Formal
)
4763 ("\null exclusion for& does not match", New_Formal
);
4765 -- Mark error posted on the new formal to avoid duplicated
4766 -- complaint about types not matching.
4768 Set_Error_Posted
(New_Formal
);
4773 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
4774 -- case occurs whenever a subprogram is being renamed and one of its
4775 -- parameters imposes a null exclusion. For example:
4777 -- type T is null record;
4778 -- type Acc_T is access T;
4779 -- subtype Acc_T_Sub is Acc_T;
4781 -- procedure P (Obj : not null Acc_T_Sub); -- itype
4782 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
4785 Old_Formal_Base
:= Etype
(Old_Formal
);
4786 New_Formal_Base
:= Etype
(New_Formal
);
4789 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
4790 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
4793 Access_Types_Match
:= Ada_Version
>= Ada_2005
4795 -- Ensure that this rule is only applied when New_Id is a
4796 -- renaming of Old_Id.
4798 and then Nkind
(Parent
(Parent
(New_Id
))) =
4799 N_Subprogram_Renaming_Declaration
4800 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
4801 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
4802 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
4804 -- Now handle the allowed access-type case
4806 and then Is_Access_Type
(Old_Formal_Base
)
4807 and then Is_Access_Type
(New_Formal_Base
)
4809 -- The type kinds must match. The only exception occurs with
4810 -- multiple generics of the form:
4813 -- type F is private; type A is private;
4814 -- type F_Ptr is access F; type A_Ptr is access A;
4815 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
4816 -- package F_Pack is ... package A_Pack is
4817 -- package F_Inst is
4818 -- new F_Pack (A, A_Ptr, A_P);
4820 -- When checking for conformance between the parameters of A_P
4821 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
4822 -- because the compiler has transformed A_Ptr into a subtype of
4823 -- F_Ptr. We catch this case in the code below.
4825 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
4827 (Is_Generic_Type
(Old_Formal_Base
)
4828 and then Is_Generic_Type
(New_Formal_Base
)
4829 and then Is_Internal
(New_Formal_Base
)
4830 and then Etype
(Etype
(New_Formal_Base
)) =
4832 and then Directly_Designated_Type
(Old_Formal_Base
) =
4833 Directly_Designated_Type
(New_Formal_Base
)
4834 and then ((Is_Itype
(Old_Formal_Base
)
4835 and then Can_Never_Be_Null
(Old_Formal_Base
))
4837 (Is_Itype
(New_Formal_Base
)
4838 and then Can_Never_Be_Null
(New_Formal_Base
)));
4840 -- Types must always match. In the visible part of an instance,
4841 -- usual overloading rules for dispatching operations apply, and
4842 -- we check base types (not the actual subtypes).
4844 if In_Instance_Visible_Part
4845 and then Is_Dispatching_Operation
(New_Id
)
4847 if not Conforming_Types
4848 (T1
=> Base_Type
(Etype
(Old_Formal
)),
4849 T2
=> Base_Type
(Etype
(New_Formal
)),
4851 Get_Inst
=> Get_Inst
)
4852 and then not Access_Types_Match
4854 Conformance_Error
("\type of & does not match!", New_Formal
);
4858 elsif not Conforming_Types
4859 (T1
=> Old_Formal_Base
,
4860 T2
=> New_Formal_Base
,
4862 Get_Inst
=> Get_Inst
)
4863 and then not Access_Types_Match
4865 -- Don't give error message if old type is Any_Type. This test
4866 -- avoids some cascaded errors, e.g. in case of a bad spec.
4868 if Errmsg
and then Old_Formal_Base
= Any_Type
then
4871 if Ctype
>= Subtype_Conformant
4873 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
4876 ("\predicate of & does not match!", New_Formal
);
4879 ("\type of & does not match!", New_Formal
);
4886 -- For mode conformance, mode must match
4888 if Ctype
>= Mode_Conformant
then
4889 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
4890 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
4891 or else not Is_Primitive_Wrapper
(New_Id
)
4893 Conformance_Error
("\mode of & does not match!", New_Formal
);
4897 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
4899 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
4901 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
4904 ("\mode of & does not match!", New_Formal
);
4911 -- Part of mode conformance for access types is having the same
4912 -- constant modifier.
4914 elsif Access_Types_Match
4915 and then Is_Access_Constant
(Old_Formal_Base
) /=
4916 Is_Access_Constant
(New_Formal_Base
)
4919 ("\constant modifier does not match!", New_Formal
);
4924 if Ctype
>= Subtype_Conformant
then
4926 -- Ada 2005 (AI-231): In case of anonymous access types check
4927 -- the null-exclusion and access-to-constant attributes must
4928 -- match. For null exclusion, we test the types rather than the
4929 -- formals themselves, since the attribute is only set reliably
4930 -- on the formals in the Ada 95 case, and we exclude the case
4931 -- where Old_Formal is marked as controlling, to avoid errors
4932 -- when matching completing bodies with dispatching declarations
4933 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
4935 if Ada_Version
>= Ada_2005
4936 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
4937 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
4939 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
4940 Can_Never_Be_Null
(Etype
(New_Formal
))
4942 not Is_Controlling_Formal
(Old_Formal
))
4944 Is_Access_Constant
(Etype
(Old_Formal
)) /=
4945 Is_Access_Constant
(Etype
(New_Formal
)))
4947 -- Do not complain if error already posted on New_Formal. This
4948 -- avoids some redundant error messages.
4950 and then not Error_Posted
(New_Formal
)
4952 -- It is allowed to omit the null-exclusion in case of stream
4953 -- attribute subprograms. We recognize stream subprograms
4954 -- through their TSS-generated suffix.
4957 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
4960 if TSS_Name
/= TSS_Stream_Read
4961 and then TSS_Name
/= TSS_Stream_Write
4962 and then TSS_Name
/= TSS_Stream_Input
4963 and then TSS_Name
/= TSS_Stream_Output
4965 -- Here we have a definite conformance error. It is worth
4966 -- special casing the error message for the case of a
4967 -- controlling formal (which excludes null).
4969 if Is_Controlling_Formal
(New_Formal
) then
4970 Error_Msg_Node_2
:= Scope
(New_Formal
);
4972 ("\controlling formal & of & excludes null, "
4973 & "declaration must exclude null as well",
4976 -- Normal case (couldn't we give more detail here???)
4980 ("\type of & does not match!", New_Formal
);
4989 -- Full conformance checks
4991 if Ctype
= Fully_Conformant
then
4993 -- We have checked already that names match
4995 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
4997 -- Check default expressions for in parameters
5000 NewD
: constant Boolean :=
5001 Present
(Default_Value
(New_Formal
));
5002 OldD
: constant Boolean :=
5003 Present
(Default_Value
(Old_Formal
));
5005 if NewD
or OldD
then
5007 -- The old default value has been analyzed because the
5008 -- current full declaration will have frozen everything
5009 -- before. The new default value has not been analyzed,
5010 -- so analyze it now before we check for conformance.
5013 Push_Scope
(New_Id
);
5014 Preanalyze_Spec_Expression
5015 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5019 if not (NewD
and OldD
)
5020 or else not Fully_Conformant_Expressions
5021 (Default_Value
(Old_Formal
),
5022 Default_Value
(New_Formal
))
5025 ("\default expression for & does not match!",
5034 -- A couple of special checks for Ada 83 mode. These checks are
5035 -- skipped if either entity is an operator in package Standard,
5036 -- or if either old or new instance is not from the source program.
5038 if Ada_Version
= Ada_83
5039 and then Sloc
(Old_Id
) > Standard_Location
5040 and then Sloc
(New_Id
) > Standard_Location
5041 and then Comes_From_Source
(Old_Id
)
5042 and then Comes_From_Source
(New_Id
)
5045 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5046 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5049 -- Explicit IN must be present or absent in both cases. This
5050 -- test is required only in the full conformance case.
5052 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5053 and then Ctype
= Fully_Conformant
5056 ("\(Ada 83) IN must appear in both declarations",
5061 -- Grouping (use of comma in param lists) must be the same
5062 -- This is where we catch a misconformance like:
5065 -- A : Integer; B : Integer
5067 -- which are represented identically in the tree except
5068 -- for the setting of the flags More_Ids and Prev_Ids.
5070 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5071 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5074 ("\grouping of & does not match!", New_Formal
);
5080 -- This label is required when skipping controlling formals
5082 <<Skip_Controlling_Formal
>>
5084 Next_Formal
(Old_Formal
);
5085 Next_Formal
(New_Formal
);
5088 if Present
(Old_Formal
) then
5089 Conformance_Error
("\too few parameters!");
5092 elsif Present
(New_Formal
) then
5093 Conformance_Error
("\too many parameters!", New_Formal
);
5096 end Check_Conformance
;
5098 -----------------------
5099 -- Check_Conventions --
5100 -----------------------
5102 procedure Check_Conventions
(Typ
: Entity_Id
) is
5103 Ifaces_List
: Elist_Id
;
5105 procedure Check_Convention
(Op
: Entity_Id
);
5106 -- Verify that the convention of inherited dispatching operation Op is
5107 -- consistent among all subprograms it overrides. In order to minimize
5108 -- the search, Search_From is utilized to designate a specific point in
5109 -- the list rather than iterating over the whole list once more.
5111 ----------------------
5112 -- Check_Convention --
5113 ----------------------
5115 procedure Check_Convention
(Op
: Entity_Id
) is
5116 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5117 Iface_Conv
: Convention_Id
;
5118 Iface_Elmt
: Elmt_Id
;
5119 Iface_Prim_Elmt
: Elmt_Id
;
5120 Iface_Prim
: Entity_Id
;
5123 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5124 while Present
(Iface_Elmt
) loop
5126 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5127 while Present
(Iface_Prim_Elmt
) loop
5128 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5129 Iface_Conv
:= Convention
(Iface_Prim
);
5131 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5132 and then Iface_Conv
/= Op_Conv
5135 ("inconsistent conventions in primitive operations", Typ
);
5137 Error_Msg_Name_1
:= Chars
(Op
);
5138 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5139 Error_Msg_Sloc
:= Sloc
(Op
);
5141 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5142 if not Present
(Overridden_Operation
(Op
)) then
5143 Error_Msg_N
("\\primitive % defined #", Typ
);
5146 ("\\overriding operation % with "
5147 & "convention % defined #", Typ
);
5150 else pragma Assert
(Present
(Alias
(Op
)));
5151 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5152 Error_Msg_N
("\\inherited operation % with "
5153 & "convention % defined #", Typ
);
5156 Error_Msg_Name_1
:= Chars
(Op
);
5157 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5158 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5159 Error_Msg_N
("\\overridden operation % with "
5160 & "convention % defined #", Typ
);
5162 -- Avoid cascading errors
5167 Next_Elmt
(Iface_Prim_Elmt
);
5170 Next_Elmt
(Iface_Elmt
);
5172 end Check_Convention
;
5176 Prim_Op
: Entity_Id
;
5177 Prim_Op_Elmt
: Elmt_Id
;
5179 -- Start of processing for Check_Conventions
5182 if not Has_Interfaces
(Typ
) then
5186 Collect_Interfaces
(Typ
, Ifaces_List
);
5188 -- The algorithm checks every overriding dispatching operation against
5189 -- all the corresponding overridden dispatching operations, detecting
5190 -- differences in conventions.
5192 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5193 while Present
(Prim_Op_Elmt
) loop
5194 Prim_Op
:= Node
(Prim_Op_Elmt
);
5196 -- A small optimization: skip the predefined dispatching operations
5197 -- since they always have the same convention.
5199 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5200 Check_Convention
(Prim_Op
);
5203 Next_Elmt
(Prim_Op_Elmt
);
5205 end Check_Conventions
;
5207 ------------------------------
5208 -- Check_Delayed_Subprogram --
5209 ------------------------------
5211 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5214 procedure Possible_Freeze
(T
: Entity_Id
);
5215 -- T is the type of either a formal parameter or of the return type.
5216 -- If T is not yet frozen and needs a delayed freeze, then the
5217 -- subprogram itself must be delayed. If T is the limited view of an
5218 -- incomplete type the subprogram must be frozen as well, because
5219 -- T may depend on local types that have not been frozen yet.
5221 ---------------------
5222 -- Possible_Freeze --
5223 ---------------------
5225 procedure Possible_Freeze
(T
: Entity_Id
) is
5227 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5228 Set_Has_Delayed_Freeze
(Designator
);
5230 elsif Is_Access_Type
(T
)
5231 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5232 and then not Is_Frozen
(Designated_Type
(T
))
5234 Set_Has_Delayed_Freeze
(Designator
);
5236 elsif Ekind
(T
) = E_Incomplete_Type
5237 and then From_Limited_With
(T
)
5239 Set_Has_Delayed_Freeze
(Designator
);
5241 -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile
5242 -- of a subprogram or entry declaration.
5244 elsif Ekind
(T
) = E_Incomplete_Type
5245 and then Ada_Version
>= Ada_2012
5247 Set_Has_Delayed_Freeze
(Designator
);
5250 end Possible_Freeze
;
5252 -- Start of processing for Check_Delayed_Subprogram
5255 -- All subprograms, including abstract subprograms, may need a freeze
5256 -- node if some formal type or the return type needs one.
5258 Possible_Freeze
(Etype
(Designator
));
5259 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5261 -- Need delayed freeze if any of the formal types themselves need
5262 -- a delayed freeze and are not yet frozen.
5264 F
:= First_Formal
(Designator
);
5265 while Present
(F
) loop
5266 Possible_Freeze
(Etype
(F
));
5267 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5271 -- Mark functions that return by reference. Note that it cannot be
5272 -- done for delayed_freeze subprograms because the underlying
5273 -- returned type may not be known yet (for private types)
5275 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5277 Typ
: constant Entity_Id
:= Etype
(Designator
);
5278 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5280 if Is_Limited_View
(Typ
) then
5281 Set_Returns_By_Ref
(Designator
);
5282 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5283 Set_Returns_By_Ref
(Designator
);
5287 end Check_Delayed_Subprogram
;
5289 ------------------------------------
5290 -- Check_Discriminant_Conformance --
5291 ------------------------------------
5293 procedure Check_Discriminant_Conformance
5298 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5299 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5300 New_Discr_Id
: Entity_Id
;
5301 New_Discr_Type
: Entity_Id
;
5303 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5304 -- Post error message for conformance error on given node. Two messages
5305 -- are output. The first points to the previous declaration with a
5306 -- general "no conformance" message. The second is the detailed reason,
5307 -- supplied as Msg. The parameter N provide information for a possible
5308 -- & insertion in the message.
5310 -----------------------
5311 -- Conformance_Error --
5312 -----------------------
5314 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5316 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5317 Error_Msg_N
-- CODEFIX
5318 ("not fully conformant with declaration#!", N
);
5319 Error_Msg_NE
(Msg
, N
, N
);
5320 end Conformance_Error
;
5322 -- Start of processing for Check_Discriminant_Conformance
5325 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5326 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5328 -- The subtype mark of the discriminant on the full type has not
5329 -- been analyzed so we do it here. For an access discriminant a new
5332 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5334 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5337 Analyze
(Discriminant_Type
(New_Discr
));
5338 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5340 -- Ada 2005: if the discriminant definition carries a null
5341 -- exclusion, create an itype to check properly for consistency
5342 -- with partial declaration.
5344 if Is_Access_Type
(New_Discr_Type
)
5345 and then Null_Exclusion_Present
(New_Discr
)
5348 Create_Null_Excluding_Itype
5349 (T
=> New_Discr_Type
,
5350 Related_Nod
=> New_Discr
,
5351 Scope_Id
=> Current_Scope
);
5355 if not Conforming_Types
5356 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5358 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5361 -- Treat the new discriminant as an occurrence of the old one,
5362 -- for navigation purposes, and fill in some semantic
5363 -- information, for completeness.
5365 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5366 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5367 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5372 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5373 Conformance_Error
("name & does not match!", New_Discr_Id
);
5377 -- Default expressions must match
5380 NewD
: constant Boolean :=
5381 Present
(Expression
(New_Discr
));
5382 OldD
: constant Boolean :=
5383 Present
(Expression
(Parent
(Old_Discr
)));
5386 if NewD
or OldD
then
5388 -- The old default value has been analyzed and expanded,
5389 -- because the current full declaration will have frozen
5390 -- everything before. The new default values have not been
5391 -- expanded, so expand now to check conformance.
5394 Preanalyze_Spec_Expression
5395 (Expression
(New_Discr
), New_Discr_Type
);
5398 if not (NewD
and OldD
)
5399 or else not Fully_Conformant_Expressions
5400 (Expression
(Parent
(Old_Discr
)),
5401 Expression
(New_Discr
))
5405 ("default expression for & does not match!",
5412 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
5414 if Ada_Version
= Ada_83
then
5416 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
5419 -- Grouping (use of comma in param lists) must be the same
5420 -- This is where we catch a misconformance like:
5423 -- A : Integer; B : Integer
5425 -- which are represented identically in the tree except
5426 -- for the setting of the flags More_Ids and Prev_Ids.
5428 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
5429 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
5432 ("grouping of & does not match!", New_Discr_Id
);
5438 Next_Discriminant
(Old_Discr
);
5442 if Present
(Old_Discr
) then
5443 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
5446 elsif Present
(New_Discr
) then
5448 ("too many discriminants!", Defining_Identifier
(New_Discr
));
5451 end Check_Discriminant_Conformance
;
5453 ----------------------------
5454 -- Check_Fully_Conformant --
5455 ----------------------------
5457 procedure Check_Fully_Conformant
5458 (New_Id
: Entity_Id
;
5460 Err_Loc
: Node_Id
:= Empty
)
5463 pragma Warnings
(Off
, Result
);
5466 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
5467 end Check_Fully_Conformant
;
5469 ---------------------------
5470 -- Check_Mode_Conformant --
5471 ---------------------------
5473 procedure Check_Mode_Conformant
5474 (New_Id
: Entity_Id
;
5476 Err_Loc
: Node_Id
:= Empty
;
5477 Get_Inst
: Boolean := False)
5480 pragma Warnings
(Off
, Result
);
5483 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
5484 end Check_Mode_Conformant
;
5486 --------------------------------
5487 -- Check_Overriding_Indicator --
5488 --------------------------------
5490 procedure Check_Overriding_Indicator
5492 Overridden_Subp
: Entity_Id
;
5493 Is_Primitive
: Boolean)
5499 -- No overriding indicator for literals
5501 if Ekind
(Subp
) = E_Enumeration_Literal
then
5504 elsif Ekind
(Subp
) = E_Entry
then
5505 Decl
:= Parent
(Subp
);
5507 -- No point in analyzing a malformed operator
5509 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
5510 and then Error_Posted
(Subp
)
5515 Decl
:= Unit_Declaration_Node
(Subp
);
5518 if Nkind_In
(Decl
, N_Subprogram_Body
,
5519 N_Subprogram_Body_Stub
,
5520 N_Subprogram_Declaration
,
5521 N_Abstract_Subprogram_Declaration
,
5522 N_Subprogram_Renaming_Declaration
)
5524 Spec
:= Specification
(Decl
);
5526 elsif Nkind
(Decl
) = N_Entry_Declaration
then
5533 -- The overriding operation is type conformant with the overridden one,
5534 -- but the names of the formals are not required to match. If the names
5535 -- appear permuted in the overriding operation, this is a possible
5536 -- source of confusion that is worth diagnosing. Controlling formals
5537 -- often carry names that reflect the type, and it is not worthwhile
5538 -- requiring that their names match.
5540 if Present
(Overridden_Subp
)
5541 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
5548 Form1
:= First_Formal
(Subp
);
5549 Form2
:= First_Formal
(Overridden_Subp
);
5551 -- If the overriding operation is a synchronized operation, skip
5552 -- the first parameter of the overridden operation, which is
5553 -- implicit in the new one. If the operation is declared in the
5554 -- body it is not primitive and all formals must match.
5556 if Is_Concurrent_Type
(Scope
(Subp
))
5557 and then Is_Tagged_Type
(Scope
(Subp
))
5558 and then not Has_Completion
(Scope
(Subp
))
5560 Form2
:= Next_Formal
(Form2
);
5563 if Present
(Form1
) then
5564 Form1
:= Next_Formal
(Form1
);
5565 Form2
:= Next_Formal
(Form2
);
5568 while Present
(Form1
) loop
5569 if not Is_Controlling_Formal
(Form1
)
5570 and then Present
(Next_Formal
(Form2
))
5571 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
5573 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
5574 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
5576 ("& does not match corresponding formal of&#",
5581 Next_Formal
(Form1
);
5582 Next_Formal
(Form2
);
5587 -- If there is an overridden subprogram, then check that there is no
5588 -- "not overriding" indicator, and mark the subprogram as overriding.
5589 -- This is not done if the overridden subprogram is marked as hidden,
5590 -- which can occur for the case of inherited controlled operations
5591 -- (see Derive_Subprogram), unless the inherited subprogram's parent
5592 -- subprogram is not itself hidden. (Note: This condition could probably
5593 -- be simplified, leaving out the testing for the specific controlled
5594 -- cases, but it seems safer and clearer this way, and echoes similar
5595 -- special-case tests of this kind in other places.)
5597 if Present
(Overridden_Subp
)
5598 and then (not Is_Hidden
(Overridden_Subp
)
5600 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
5603 and then Present
(Alias
(Overridden_Subp
))
5604 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
5606 if Must_Not_Override
(Spec
) then
5607 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
5609 if Ekind
(Subp
) = E_Entry
then
5611 ("entry & overrides inherited operation #", Spec
, Subp
);
5614 ("subprogram & overrides inherited operation #", Spec
, Subp
);
5617 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
5618 -- as an extension of Root_Controlled, and thus has a useless Adjust
5619 -- operation. This operation should not be inherited by other limited
5620 -- controlled types. An explicit Adjust for them is not overriding.
5622 elsif Must_Override
(Spec
)
5623 and then Chars
(Overridden_Subp
) = Name_Adjust
5624 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
5625 and then Present
(Alias
(Overridden_Subp
))
5627 Is_Predefined_File_Name
5628 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))))
5630 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5632 elsif Is_Subprogram
(Subp
) then
5633 if Is_Init_Proc
(Subp
) then
5636 elsif No
(Overridden_Operation
(Subp
)) then
5638 -- For entities generated by Derive_Subprograms the overridden
5639 -- operation is the inherited primitive (which is available
5640 -- through the attribute alias)
5642 if (Is_Dispatching_Operation
(Subp
)
5643 or else Is_Dispatching_Operation
(Overridden_Subp
))
5644 and then not Comes_From_Source
(Overridden_Subp
)
5645 and then Find_Dispatching_Type
(Overridden_Subp
) =
5646 Find_Dispatching_Type
(Subp
)
5647 and then Present
(Alias
(Overridden_Subp
))
5648 and then Comes_From_Source
(Alias
(Overridden_Subp
))
5650 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
5651 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
5654 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
5655 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
5660 -- If primitive flag is set or this is a protected operation, then
5661 -- the operation is overriding at the point of its declaration, so
5662 -- warn if necessary. Otherwise it may have been declared before the
5663 -- operation it overrides and no check is required.
5666 and then not Must_Override
(Spec
)
5667 and then (Is_Primitive
5668 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
5670 Style
.Missing_Overriding
(Decl
, Subp
);
5673 -- If Subp is an operator, it may override a predefined operation, if
5674 -- it is defined in the same scope as the type to which it applies.
5675 -- In that case Overridden_Subp is empty because of our implicit
5676 -- representation for predefined operators. We have to check whether the
5677 -- signature of Subp matches that of a predefined operator. Note that
5678 -- first argument provides the name of the operator, and the second
5679 -- argument the signature that may match that of a standard operation.
5680 -- If the indicator is overriding, then the operator must match a
5681 -- predefined signature, because we know already that there is no
5682 -- explicit overridden operation.
5684 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
5685 if Must_Not_Override
(Spec
) then
5687 -- If this is not a primitive or a protected subprogram, then
5688 -- "not overriding" is illegal.
5691 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5693 Error_Msg_N
("overriding indicator only allowed "
5694 & "if subprogram is primitive", Subp
);
5696 elsif Can_Override_Operator
(Subp
) then
5698 ("subprogram& overrides predefined operator ", Spec
, Subp
);
5701 elsif Must_Override
(Spec
) then
5702 if No
(Overridden_Operation
(Subp
))
5703 and then not Can_Override_Operator
(Subp
)
5705 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5708 elsif not Error_Posted
(Subp
)
5709 and then Style_Check
5710 and then Can_Override_Operator
(Subp
)
5712 not Is_Predefined_File_Name
5713 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
5715 -- If style checks are enabled, indicate that the indicator is
5716 -- missing. However, at the point of declaration, the type of
5717 -- which this is a primitive operation may be private, in which
5718 -- case the indicator would be premature.
5720 if Has_Private_Declaration
(Etype
(Subp
))
5721 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
5725 Style
.Missing_Overriding
(Decl
, Subp
);
5729 elsif Must_Override
(Spec
) then
5730 if Ekind
(Subp
) = E_Entry
then
5731 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
5733 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5736 -- If the operation is marked "not overriding" and it's not primitive
5737 -- then an error is issued, unless this is an operation of a task or
5738 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
5739 -- has been specified have already been checked above.
5741 elsif Must_Not_Override
(Spec
)
5742 and then not Is_Primitive
5743 and then Ekind
(Subp
) /= E_Entry
5744 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5747 ("overriding indicator only allowed if subprogram is primitive",
5751 end Check_Overriding_Indicator
;
5757 -- Note: this procedure needs to know far too much about how the expander
5758 -- messes with exceptions. The use of the flag Exception_Junk and the
5759 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
5760 -- works, but is not very clean. It would be better if the expansion
5761 -- routines would leave Original_Node working nicely, and we could use
5762 -- Original_Node here to ignore all the peculiar expander messing ???
5764 procedure Check_Returns
5768 Proc
: Entity_Id
:= Empty
)
5772 procedure Check_Statement_Sequence
(L
: List_Id
);
5773 -- Internal recursive procedure to check a list of statements for proper
5774 -- termination by a return statement (or a transfer of control or a
5775 -- compound statement that is itself internally properly terminated).
5777 ------------------------------
5778 -- Check_Statement_Sequence --
5779 ------------------------------
5781 procedure Check_Statement_Sequence
(L
: List_Id
) is
5786 function Assert_False
return Boolean;
5787 -- Returns True if Last_Stm is a pragma Assert (False) that has been
5788 -- rewritten as a null statement when assertions are off. The assert
5789 -- is not active, but it is still enough to kill the warning.
5795 function Assert_False
return Boolean is
5796 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
5799 if Nkind
(Orig
) = N_Pragma
5800 and then Pragma_Name
(Orig
) = Name_Assert
5801 and then not Error_Posted
(Orig
)
5804 Arg
: constant Node_Id
:=
5805 First
(Pragma_Argument_Associations
(Orig
));
5806 Exp
: constant Node_Id
:= Expression
(Arg
);
5808 return Nkind
(Exp
) = N_Identifier
5809 and then Chars
(Exp
) = Name_False
;
5819 Raise_Exception_Call
: Boolean;
5820 -- Set True if statement sequence terminated by Raise_Exception call
5821 -- or a Reraise_Occurrence call.
5823 -- Start of processing for Check_Statement_Sequence
5826 Raise_Exception_Call
:= False;
5828 -- Get last real statement
5830 Last_Stm
:= Last
(L
);
5832 -- Deal with digging out exception handler statement sequences that
5833 -- have been transformed by the local raise to goto optimization.
5834 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
5835 -- optimization has occurred, we are looking at something like:
5838 -- original stmts in block
5842 -- goto L1; | omitted if No_Exception_Propagation
5847 -- goto L3; -- skip handler when exception not raised
5849 -- <<L1>> -- target label for local exception
5863 -- and what we have to do is to dig out the estmts1 and estmts2
5864 -- sequences (which were the original sequences of statements in
5865 -- the exception handlers) and check them.
5867 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
5872 exit when Nkind
(Stm
) /= N_Block_Statement
;
5873 exit when not Exception_Junk
(Stm
);
5876 exit when Nkind
(Stm
) /= N_Label
;
5877 exit when not Exception_Junk
(Stm
);
5878 Check_Statement_Sequence
5879 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
5884 exit when Nkind
(Stm
) /= N_Goto_Statement
;
5885 exit when not Exception_Junk
(Stm
);
5889 -- Don't count pragmas
5891 while Nkind
(Last_Stm
) = N_Pragma
5893 -- Don't count call to SS_Release (can happen after Raise_Exception)
5896 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
5898 Nkind
(Name
(Last_Stm
)) = N_Identifier
5900 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
5902 -- Don't count exception junk
5905 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
5907 N_Object_Declaration
)
5908 and then Exception_Junk
(Last_Stm
))
5909 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
5910 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
5912 -- Inserted code, such as finalization calls, is irrelevant: we only
5913 -- need to check original source.
5915 or else Is_Rewrite_Insertion
(Last_Stm
)
5920 -- Here we have the "real" last statement
5922 Kind
:= Nkind
(Last_Stm
);
5924 -- Transfer of control, OK. Note that in the No_Return procedure
5925 -- case, we already diagnosed any explicit return statements, so
5926 -- we can treat them as OK in this context.
5928 if Is_Transfer
(Last_Stm
) then
5931 -- Check cases of explicit non-indirect procedure calls
5933 elsif Kind
= N_Procedure_Call_Statement
5934 and then Is_Entity_Name
(Name
(Last_Stm
))
5936 -- Check call to Raise_Exception procedure which is treated
5937 -- specially, as is a call to Reraise_Occurrence.
5939 -- We suppress the warning in these cases since it is likely that
5940 -- the programmer really does not expect to deal with the case
5941 -- of Null_Occurrence, and thus would find a warning about a
5942 -- missing return curious, and raising Program_Error does not
5943 -- seem such a bad behavior if this does occur.
5945 -- Note that in the Ada 2005 case for Raise_Exception, the actual
5946 -- behavior will be to raise Constraint_Error (see AI-329).
5948 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
5950 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
5952 Raise_Exception_Call
:= True;
5954 -- For Raise_Exception call, test first argument, if it is
5955 -- an attribute reference for a 'Identity call, then we know
5956 -- that the call cannot possibly return.
5959 Arg
: constant Node_Id
:=
5960 Original_Node
(First_Actual
(Last_Stm
));
5962 if Nkind
(Arg
) = N_Attribute_Reference
5963 and then Attribute_Name
(Arg
) = Name_Identity
5970 -- If statement, need to look inside if there is an else and check
5971 -- each constituent statement sequence for proper termination.
5973 elsif Kind
= N_If_Statement
5974 and then Present
(Else_Statements
(Last_Stm
))
5976 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
5977 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
5979 if Present
(Elsif_Parts
(Last_Stm
)) then
5981 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
5984 while Present
(Elsif_Part
) loop
5985 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
5993 -- Case statement, check each case for proper termination
5995 elsif Kind
= N_Case_Statement
then
5999 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6000 while Present
(Case_Alt
) loop
6001 Check_Statement_Sequence
(Statements
(Case_Alt
));
6002 Next_Non_Pragma
(Case_Alt
);
6008 -- Block statement, check its handled sequence of statements
6010 elsif Kind
= N_Block_Statement
then
6016 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6025 -- Loop statement. If there is an iteration scheme, we can definitely
6026 -- fall out of the loop. Similarly if there is an exit statement, we
6027 -- can fall out. In either case we need a following return.
6029 elsif Kind
= N_Loop_Statement
then
6030 if Present
(Iteration_Scheme
(Last_Stm
))
6031 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6035 -- A loop with no exit statement or iteration scheme is either
6036 -- an infinite loop, or it has some other exit (raise/return).
6037 -- In either case, no warning is required.
6043 -- Timed entry call, check entry call and delay alternatives
6045 -- Note: in expanded code, the timed entry call has been converted
6046 -- to a set of expanded statements on which the check will work
6047 -- correctly in any case.
6049 elsif Kind
= N_Timed_Entry_Call
then
6051 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6052 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6055 -- If statement sequence of entry call alternative is missing,
6056 -- then we can definitely fall through, and we post the error
6057 -- message on the entry call alternative itself.
6059 if No
(Statements
(ECA
)) then
6062 -- If statement sequence of delay alternative is missing, then
6063 -- we can definitely fall through, and we post the error
6064 -- message on the delay alternative itself.
6066 -- Note: if both ECA and DCA are missing the return, then we
6067 -- post only one message, should be enough to fix the bugs.
6068 -- If not we will get a message next time on the DCA when the
6071 elsif No
(Statements
(DCA
)) then
6074 -- Else check both statement sequences
6077 Check_Statement_Sequence
(Statements
(ECA
));
6078 Check_Statement_Sequence
(Statements
(DCA
));
6083 -- Conditional entry call, check entry call and else part
6085 -- Note: in expanded code, the conditional entry call has been
6086 -- converted to a set of expanded statements on which the check
6087 -- will work correctly in any case.
6089 elsif Kind
= N_Conditional_Entry_Call
then
6091 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6094 -- If statement sequence of entry call alternative is missing,
6095 -- then we can definitely fall through, and we post the error
6096 -- message on the entry call alternative itself.
6098 if No
(Statements
(ECA
)) then
6101 -- Else check statement sequence and else part
6104 Check_Statement_Sequence
(Statements
(ECA
));
6105 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6111 -- If we fall through, issue appropriate message
6115 -- Kill warning if last statement is a raise exception call,
6116 -- or a pragma Assert (False). Note that with assertions enabled,
6117 -- such a pragma has been converted into a raise exception call
6118 -- already, so the Assert_False is for the assertions off case.
6120 if not Raise_Exception_Call
and then not Assert_False
then
6122 -- In GNATprove mode, it is an error to have a missing return
6124 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6126 -- Issue error message or warning
6129 ("RETURN statement missing following this statement<<!",
6132 ("\Program_Error ]<<!", Last_Stm
);
6135 -- Note: we set Err even though we have not issued a warning
6136 -- because we still have a case of a missing return. This is
6137 -- an extremely marginal case, probably will never be noticed
6138 -- but we might as well get it right.
6142 -- Otherwise we have the case of a procedure marked No_Return
6145 if not Raise_Exception_Call
then
6146 if GNATprove_Mode
then
6148 ("implied return after this statement "
6149 & "would have raised Program_Error", Last_Stm
);
6152 ("implied return after this statement "
6153 & "will raise Program_Error??", Last_Stm
);
6156 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6158 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6162 RE
: constant Node_Id
:=
6163 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6164 Reason
=> PE_Implicit_Return
);
6166 Insert_After
(Last_Stm
, RE
);
6170 end Check_Statement_Sequence
;
6172 -- Start of processing for Check_Returns
6176 Check_Statement_Sequence
(Statements
(HSS
));
6178 if Present
(Exception_Handlers
(HSS
)) then
6179 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6180 while Present
(Handler
) loop
6181 Check_Statement_Sequence
(Statements
(Handler
));
6182 Next_Non_Pragma
(Handler
);
6187 ----------------------------
6188 -- Check_Subprogram_Order --
6189 ----------------------------
6191 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6193 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6194 -- This is used to check if S1 > S2 in the sense required by this test,
6195 -- for example nameab < namec, but name2 < name10.
6197 -----------------------------
6198 -- Subprogram_Name_Greater --
6199 -----------------------------
6201 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6206 -- Deal with special case where names are identical except for a
6207 -- numerical suffix. These are handled specially, taking the numeric
6208 -- ordering from the suffix into account.
6211 while S1
(L1
) in '0' .. '9' loop
6216 while S2
(L2
) in '0' .. '9' loop
6220 -- If non-numeric parts non-equal, do straight compare
6222 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6225 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6226 -- that a missing suffix is treated as numeric zero in this test.
6230 while L1
< S1
'Last loop
6232 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6236 while L2
< S2
'Last loop
6238 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6243 end Subprogram_Name_Greater
;
6245 -- Start of processing for Check_Subprogram_Order
6248 -- Check body in alpha order if this is option
6251 and then Style_Check_Order_Subprograms
6252 and then Nkind
(N
) = N_Subprogram_Body
6253 and then Comes_From_Source
(N
)
6254 and then In_Extended_Main_Source_Unit
(N
)
6258 renames Scope_Stack
.Table
6259 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6261 Body_Id
: constant Entity_Id
:=
6262 Defining_Entity
(Specification
(N
));
6265 Get_Decoded_Name_String
(Chars
(Body_Id
));
6268 if Subprogram_Name_Greater
6269 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6271 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6277 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6280 end Check_Subprogram_Order;
6282 ------------------------------
6283 -- Check_Subtype_Conformant --
6284 ------------------------------
6286 procedure Check_Subtype_Conformant
6287 (New_Id : Entity_Id;
6289 Err_Loc : Node_Id := Empty;
6290 Skip_Controlling_Formals : Boolean := False;
6291 Get_Inst : Boolean := False)
6294 pragma Warnings (Off, Result);
6297 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6298 Skip_Controlling_Formals => Skip_Controlling_Formals,
6299 Get_Inst => Get_Inst);
6300 end Check_Subtype_Conformant;
6302 ---------------------------
6303 -- Check_Type_Conformant --
6304 ---------------------------
6306 procedure Check_Type_Conformant
6307 (New_Id : Entity_Id;
6309 Err_Loc : Node_Id := Empty)
6312 pragma Warnings (Off, Result);
6315 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
6316 end Check_Type_Conformant;
6318 ---------------------------
6319 -- Can_Override_Operator --
6320 ---------------------------
6322 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
6326 if Nkind (Subp) /= N_Defining_Operator_Symbol then
6330 Typ := Base_Type (Etype (First_Formal (Subp)));
6332 -- Check explicitly that the operation is a primitive of the type
6334 return Operator_Matches_Spec (Subp, Subp)
6335 and then not Is_Generic_Type (Typ)
6336 and then Scope (Subp) = Scope (Typ)
6337 and then not Is_Class_Wide_Type (Typ);
6339 end Can_Override_Operator;
6341 ----------------------
6342 -- Conforming_Types --
6343 ----------------------
6345 function Conforming_Types
6348 Ctype : Conformance_Type;
6349 Get_Inst : Boolean := False) return Boolean
6351 Type_1 : Entity_Id := T1;
6352 Type_2 : Entity_Id := T2;
6353 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
6355 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
6356 -- If neither T1 nor T2 are generic actual types, or if they are in
6357 -- different scopes (e.g. parent and child instances), then verify that
6358 -- the base types are equal. Otherwise T1 and T2 must be on the same
6359 -- subtype chain. The whole purpose of this procedure is to prevent
6360 -- spurious ambiguities in an instantiation that may arise if two
6361 -- distinct generic types are instantiated with the same actual.
6363 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
6364 -- An access parameter can designate an incomplete type. If the
6365 -- incomplete type is the limited view of a type from a limited_
6366 -- with_clause, check whether the non-limited view is available. If
6367 -- it is a (non-limited) incomplete type, get the full view.
6369 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
6370 -- Returns True if and only if either T1 denotes a limited view of T2
6371 -- or T2 denotes a limited view of T1. This can arise when the limited
6372 -- with view of a type is used in a subprogram declaration and the
6373 -- subprogram body is in the scope of a regular with clause for the
6374 -- same unit. In such a case, the two type entities can be considered
6375 -- identical for purposes of conformance checking.
6377 ----------------------
6378 -- Base_Types_Match --
6379 ----------------------
6381 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
6382 BT1 : constant Entity_Id := Base_Type (T1);
6383 BT2 : constant Entity_Id := Base_Type (T2);
6389 elsif BT1 = BT2 then
6391 -- The following is too permissive. A more precise test should
6392 -- check that the generic actual is an ancestor subtype of the
6395 -- See code in Find_Corresponding_Spec that applies an additional
6396 -- filter to handle accidental amiguities in instances.
6398 return not Is_Generic_Actual_Type (T1)
6399 or else not Is_Generic_Actual_Type (T2)
6400 or else Scope (T1) /= Scope (T2);
6402 -- If T2 is a generic actual type it is declared as the subtype of
6403 -- the actual. If that actual is itself a subtype we need to use its
6404 -- own base type to check for compatibility.
6406 elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then
6409 elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then
6415 end Base_Types_Match;
6417 --------------------------
6418 -- Find_Designated_Type --
6419 --------------------------
6421 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
6425 Desig := Directly_Designated_Type (T);
6427 if Ekind (Desig) = E_Incomplete_Type then
6429 -- If regular incomplete type, get full view if available
6431 if Present (Full_View (Desig)) then
6432 Desig := Full_View (Desig);
6434 -- If limited view of a type, get non-limited view if available,
6435 -- and check again for a regular incomplete type.
6437 elsif Present (Non_Limited_View (Desig)) then
6438 Desig := Get_Full_View (Non_Limited_View (Desig));
6443 end Find_Designated_Type;
6445 -------------------------------
6446 -- Matches_Limited_With_View --
6447 -------------------------------
6449 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
6451 -- In some cases a type imported through a limited_with clause, and
6452 -- its nonlimited view are both visible, for example in an anonymous
6453 -- access-to-class-wide type in a formal, or when building the body
6454 -- for a subprogram renaming after the subprogram has been frozen.
6455 -- In these cases Both entities designate the same type. In addition,
6456 -- if one of them is an actual in an instance, it may be a subtype of
6457 -- the non-limited view of the other.
6459 if From_Limited_With (T1)
6460 and then (T2 = Available_View (T1)
6461 or else Is_Subtype_Of (T2, Available_View (T1)))
6465 elsif From_Limited_With (T2)
6466 and then (T1 = Available_View (T2)
6467 or else Is_Subtype_Of (T1, Available_View (T2)))
6471 elsif From_Limited_With (T1)
6472 and then From_Limited_With (T2)
6473 and then Available_View (T1) = Available_View (T2)
6480 end Matches_Limited_With_View;
6482 -- Start of processing for Conforming_Types
6485 -- The context is an instance association for a formal access-to-
6486 -- subprogram type; the formal parameter types require mapping because
6487 -- they may denote other formal parameters of the generic unit.
6490 Type_1 := Get_Instance_Of (T1);
6491 Type_2 := Get_Instance_Of (T2);
6494 -- If one of the types is a view of the other introduced by a limited
6495 -- with clause, treat these as conforming for all purposes.
6497 if Matches_Limited_With_View (T1, T2) then
6500 elsif Base_Types_Match (Type_1, Type_2) then
6501 return Ctype <= Mode_Conformant
6502 or else Subtypes_Statically_Match (Type_1, Type_2);
6504 elsif Is_Incomplete_Or_Private_Type (Type_1)
6505 and then Present (Full_View (Type_1))
6506 and then Base_Types_Match (Full_View (Type_1), Type_2)
6508 return Ctype <= Mode_Conformant
6509 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
6511 elsif Ekind (Type_2) = E_Incomplete_Type
6512 and then Present (Full_View (Type_2))
6513 and then Base_Types_Match (Type_1, Full_View (Type_2))
6515 return Ctype <= Mode_Conformant
6516 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6518 elsif Is_Private_Type (Type_2)
6519 and then In_Instance
6520 and then Present (Full_View (Type_2))
6521 and then Base_Types_Match (Type_1, Full_View (Type_2))
6523 return Ctype <= Mode_Conformant
6524 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6526 -- In Ada2012, incomplete types (including limited views) can appear
6527 -- as actuals in instantiations.
6529 elsif Is_Incomplete_Type (Type_1)
6530 and then Is_Incomplete_Type (Type_2)
6531 and then (Used_As_Generic_Actual (Type_1)
6532 or else Used_As_Generic_Actual (Type_2))
6537 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
6538 -- treated recursively because they carry a signature. As far as
6539 -- conformance is concerned, convention plays no role, and either
6540 -- or both could be access to protected subprograms.
6542 Are_Anonymous_Access_To_Subprogram_Types :=
6543 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
6544 E_Anonymous_Access_Protected_Subprogram_Type)
6546 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
6547 E_Anonymous_Access_Protected_Subprogram_Type);
6549 -- Test anonymous access type case. For this case, static subtype
6550 -- matching is required for mode conformance (RM 6.3.1(15)). We check
6551 -- the base types because we may have built internal subtype entities
6552 -- to handle null-excluding types (see Process_Formals).
6554 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
6556 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
6558 -- Ada 2005 (AI-254)
6560 or else Are_Anonymous_Access_To_Subprogram_Types
6563 Desig_1 : Entity_Id;
6564 Desig_2 : Entity_Id;
6567 -- In Ada 2005, access constant indicators must match for
6568 -- subtype conformance.
6570 if Ada_Version >= Ada_2005
6571 and then Ctype >= Subtype_Conformant
6573 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
6578 Desig_1 := Find_Designated_Type (Type_1);
6579 Desig_2 := Find_Designated_Type (Type_2);
6581 -- If the context is an instance association for a formal
6582 -- access-to-subprogram type; formal access parameter designated
6583 -- types require mapping because they may denote other formal
6584 -- parameters of the generic unit.
6587 Desig_1 := Get_Instance_Of (Desig_1);
6588 Desig_2 := Get_Instance_Of (Desig_2);
6591 -- It is possible for a Class_Wide_Type to be introduced for an
6592 -- incomplete type, in which case there is a separate class_ wide
6593 -- type for the full view. The types conform if their Etypes
6594 -- conform, i.e. one may be the full view of the other. This can
6595 -- only happen in the context of an access parameter, other uses
6596 -- of an incomplete Class_Wide_Type are illegal.
6598 if Is_Class_Wide_Type (Desig_1)
6600 Is_Class_Wide_Type (Desig_2)
6604 (Etype (Base_Type (Desig_1)),
6605 Etype (Base_Type (Desig_2)), Ctype);
6607 elsif Are_Anonymous_Access_To_Subprogram_Types then
6608 if Ada_Version < Ada_2005 then
6609 return Ctype = Type_Conformant
6611 Subtypes_Statically_Match (Desig_1, Desig_2);
6613 -- We must check the conformance of the signatures themselves
6617 Conformant : Boolean;
6620 (Desig_1, Desig_2, Ctype, False, Conformant);
6625 -- A limited view of an actual matches the corresponding
6626 -- incomplete formal.
6628 elsif Ekind (Desig_2) = E_Incomplete_Subtype
6629 and then From_Limited_With (Desig_2)
6630 and then Used_As_Generic_Actual (Etype (Desig_2))
6635 return Base_Type (Desig_1) = Base_Type (Desig_2)
6636 and then (Ctype = Type_Conformant
6638 Subtypes_Statically_Match (Desig_1, Desig_2));
6642 -- Otherwise definitely no match
6645 if ((Ekind (Type_1) = E_Anonymous_Access_Type
6646 and then Is_Access_Type (Type_2))
6647 or else (Ekind (Type_2) = E_Anonymous_Access_Type
6648 and then Is_Access_Type (Type_1)))
6651 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
6653 May_Hide_Profile := True;
6658 end Conforming_Types;
6660 --------------------------
6661 -- Create_Extra_Formals --
6662 --------------------------
6664 procedure Create_Extra_Formals (E : Entity_Id) is
6666 First_Extra : Entity_Id := Empty;
6667 Last_Extra : Entity_Id;
6668 Formal_Type : Entity_Id;
6669 P_Formal : Entity_Id := Empty;
6671 function Add_Extra_Formal
6672 (Assoc_Entity : Entity_Id;
6675 Suffix : String) return Entity_Id;
6676 -- Add an extra formal to the current list of formals and extra formals.
6677 -- The extra formal is added to the end of the list of extra formals,
6678 -- and also returned as the result. These formals are always of mode IN.
6679 -- The new formal has the type Typ, is declared in Scope, and its name
6680 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
6681 -- The following suffixes are currently used. They should not be changed
6682 -- without coordinating with CodePeer, which makes use of these to
6683 -- provide better messages.
6685 -- O denotes the Constrained bit.
6686 -- L denotes the accessibility level.
6687 -- BIP_xxx denotes an extra formal for a build-in-place function. See
6688 -- the full list in exp_ch6.BIP_Formal_Kind.
6690 ----------------------
6691 -- Add_Extra_Formal --
6692 ----------------------
6694 function Add_Extra_Formal
6695 (Assoc_Entity : Entity_Id;
6698 Suffix : String) return Entity_Id
6700 EF : constant Entity_Id :=
6701 Make_Defining_Identifier (Sloc (Assoc_Entity),
6702 Chars => New_External_Name (Chars (Assoc_Entity),
6706 -- A little optimization. Never generate an extra formal for the
6707 -- _init operand of an initialization procedure, since it could
6710 if Chars (Formal) = Name_uInit then
6714 Set_Ekind (EF, E_In_Parameter);
6715 Set_Actual_Subtype (EF, Typ);
6716 Set_Etype (EF, Typ);
6717 Set_Scope (EF, Scope);
6718 Set_Mechanism (EF, Default_Mechanism);
6719 Set_Formal_Validity (EF);
6721 if No (First_Extra) then
6723 Set_Extra_Formals (Scope, First_Extra);
6726 if Present (Last_Extra) then
6727 Set_Extra_Formal (Last_Extra, EF);
6733 end Add_Extra_Formal;
6735 -- Start of processing for Create_Extra_Formals
6738 -- We never generate extra formals if expansion is not active because we
6739 -- don't need them unless we are generating code.
6741 if not Expander_Active then
6745 -- No need to generate extra formals in interface thunks whose target
6746 -- primitive has no extra formals.
6748 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
6752 -- If this is a derived subprogram then the subtypes of the parent
6753 -- subprogram's formal parameters will be used to determine the need
6754 -- for extra formals.
6756 if Is_Overloadable (E) and then Present (Alias (E)) then
6757 P_Formal := First_Formal (Alias (E));
6760 Last_Extra := Empty;
6761 Formal := First_Formal (E);
6762 while Present (Formal) loop
6763 Last_Extra := Formal;
6764 Next_Formal (Formal);
6767 -- If Extra_formals were already created, don't do it again. This
6768 -- situation may arise for subprogram types created as part of
6769 -- dispatching calls (see Expand_Dispatching_Call)
6771 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
6775 -- If the subprogram is a predefined dispatching subprogram then don't
6776 -- generate any extra constrained or accessibility level formals. In
6777 -- general we suppress these for internal subprograms (by not calling
6778 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
6779 -- generated stream attributes do get passed through because extra
6780 -- build-in-place formals are needed in some cases (limited 'Input
).
6782 if Is_Predefined_Internal_Operation
(E
) then
6783 goto Test_For_Func_Result_Extras
;
6786 Formal
:= First_Formal
(E
);
6787 while Present
(Formal
) loop
6789 -- Create extra formal for supporting the attribute 'Constrained.
6790 -- The case of a private type view without discriminants also
6791 -- requires the extra formal if the underlying type has defaulted
6794 if Ekind
(Formal
) /= E_In_Parameter
then
6795 if Present
(P_Formal
) then
6796 Formal_Type
:= Etype
(P_Formal
);
6798 Formal_Type
:= Etype
(Formal
);
6801 -- Do not produce extra formals for Unchecked_Union parameters.
6802 -- Jump directly to the end of the loop.
6804 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
6805 goto Skip_Extra_Formal_Generation
;
6808 if not Has_Discriminants
(Formal_Type
)
6809 and then Ekind
(Formal_Type
) in Private_Kind
6810 and then Present
(Underlying_Type
(Formal_Type
))
6812 Formal_Type
:= Underlying_Type
(Formal_Type
);
6815 -- Suppress the extra formal if formal's subtype is constrained or
6816 -- indefinite, or we're compiling for Ada 2012 and the underlying
6817 -- type is tagged and limited. In Ada 2012, a limited tagged type
6818 -- can have defaulted discriminants, but 'Constrained is required
6819 -- to return True, so the formal is never needed (see AI05-0214).
6820 -- Note that this ensures consistency of calling sequences for
6821 -- dispatching operations when some types in a class have defaults
6822 -- on discriminants and others do not (and requiring the extra
6823 -- formal would introduce distributed overhead).
6825 -- If the type does not have a completion yet, treat as prior to
6826 -- Ada 2012 for consistency.
6828 if Has_Discriminants
(Formal_Type
)
6829 and then not Is_Constrained
(Formal_Type
)
6830 and then not Is_Indefinite_Subtype
(Formal_Type
)
6831 and then (Ada_Version
< Ada_2012
6832 or else No
(Underlying_Type
(Formal_Type
))
6834 (Is_Limited_Type
(Formal_Type
)
6837 (Underlying_Type
(Formal_Type
)))))
6839 Set_Extra_Constrained
6840 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
6844 -- Create extra formal for supporting accessibility checking. This
6845 -- is done for both anonymous access formals and formals of named
6846 -- access types that are marked as controlling formals. The latter
6847 -- case can occur when Expand_Dispatching_Call creates a subprogram
6848 -- type and substitutes the types of access-to-class-wide actuals
6849 -- for the anonymous access-to-specific-type of controlling formals.
6850 -- Base_Type is applied because in cases where there is a null
6851 -- exclusion the formal may have an access subtype.
6853 -- This is suppressed if we specifically suppress accessibility
6854 -- checks at the package level for either the subprogram, or the
6855 -- package in which it resides. However, we do not suppress it
6856 -- simply if the scope has accessibility checks suppressed, since
6857 -- this could cause trouble when clients are compiled with a
6858 -- different suppression setting. The explicit checks at the
6859 -- package level are safe from this point of view.
6861 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
6862 or else (Is_Controlling_Formal
(Formal
)
6863 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
6865 (Explicit_Suppress
(E
, Accessibility_Check
)
6867 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
6870 or else Present
(Extra_Accessibility
(P_Formal
)))
6872 Set_Extra_Accessibility
6873 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
6876 -- This label is required when skipping extra formal generation for
6877 -- Unchecked_Union parameters.
6879 <<Skip_Extra_Formal_Generation
>>
6881 if Present
(P_Formal
) then
6882 Next_Formal
(P_Formal
);
6885 Next_Formal
(Formal
);
6888 <<Test_For_Func_Result_Extras
>>
6890 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
6891 -- function call is ... determined by the point of call ...".
6893 if Needs_Result_Accessibility_Level
(E
) then
6894 Set_Extra_Accessibility_Of_Result
6895 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
6898 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
6899 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
6901 if Ada_Version
>= Ada_2005
and then Is_Build_In_Place_Function
(E
) then
6903 Result_Subt
: constant Entity_Id
:= Etype
(E
);
6904 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
6905 Formal_Typ
: Entity_Id
;
6907 Discard
: Entity_Id
;
6908 pragma Warnings
(Off
, Discard
);
6911 -- In the case of functions with unconstrained result subtypes,
6912 -- add a 4-state formal indicating whether the return object is
6913 -- allocated by the caller (1), or should be allocated by the
6914 -- callee on the secondary stack (2), in the global heap (3), or
6915 -- in a user-defined storage pool (4). For the moment we just use
6916 -- Natural for the type of this formal. Note that this formal
6917 -- isn't usually needed in the case where the result subtype is
6918 -- constrained, but it is needed when the function has a tagged
6919 -- result, because generally such functions can be called in a
6920 -- dispatching context and such calls must be handled like calls
6921 -- to a class-wide function.
6923 if Needs_BIP_Alloc_Form
(E
) then
6926 (E
, Standard_Natural
,
6927 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
6929 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
6930 -- use a user-defined pool. This formal is not added on
6931 -- .NET/JVM/ZFP as those targets do not support pools.
6933 if VM_Target
= No_VM
6934 and then RTE_Available
(RE_Root_Storage_Pool_Ptr
)
6938 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
6939 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
6943 -- In the case of functions whose result type needs finalization,
6944 -- add an extra formal which represents the finalization master.
6946 if Needs_BIP_Finalization_Master
(E
) then
6949 (E
, RTE
(RE_Finalization_Master_Ptr
),
6950 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
6953 -- When the result type contains tasks, add two extra formals: the
6954 -- master of the tasks to be created, and the caller's activation
6957 if Has_Task
(Full_Subt
) then
6960 (E
, RTE
(RE_Master_Id
),
6961 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
6964 (E
, RTE
(RE_Activation_Chain_Access
),
6965 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
6968 -- All build-in-place functions get an extra formal that will be
6969 -- passed the address of the return object within the caller.
6972 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
6974 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
6975 Set_Etype
(Formal_Typ
, Formal_Typ
);
6976 Set_Depends_On_Private
6977 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
6978 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
6979 Set_Is_Access_Constant
(Formal_Typ
, False);
6981 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
6982 -- the designated type comes from the limited view (for back-end
6985 Set_From_Limited_With
6986 (Formal_Typ
, From_Limited_With
(Result_Subt
));
6988 Layout_Type
(Formal_Typ
);
6992 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
6995 end Create_Extra_Formals
;
6997 -----------------------------
6998 -- Enter_Overloaded_Entity --
6999 -----------------------------
7001 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
7002 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
7003 C_E
: Entity_Id
:= Current_Entity
(S
);
7007 Set_Has_Homonym
(E
);
7008 Set_Has_Homonym
(S
);
7011 Set_Is_Immediately_Visible
(S
);
7012 Set_Scope
(S
, Current_Scope
);
7014 -- Chain new entity if front of homonym in current scope, so that
7015 -- homonyms are contiguous.
7017 if Present
(E
) and then E
/= C_E
then
7018 while Homonym
(C_E
) /= E
loop
7019 C_E
:= Homonym
(C_E
);
7022 Set_Homonym
(C_E
, S
);
7026 Set_Current_Entity
(S
);
7031 if Is_Inherited_Operation
(S
) then
7032 Append_Inherited_Subprogram
(S
);
7034 Append_Entity
(S
, Current_Scope
);
7037 Set_Public_Status
(S
);
7039 if Debug_Flag_E
then
7040 Write_Str
("New overloaded entity chain: ");
7041 Write_Name
(Chars
(S
));
7044 while Present
(E
) loop
7045 Write_Str
(" "); Write_Int
(Int
(E
));
7052 -- Generate warning for hiding
7055 and then Comes_From_Source
(S
)
7056 and then In_Extended_Main_Source_Unit
(S
)
7063 -- Warn unless genuine overloading. Do not emit warning on
7064 -- hiding predefined operators in Standard (these are either an
7065 -- (artifact of our implicit declarations, or simple noise) but
7066 -- keep warning on a operator defined on a local subtype, because
7067 -- of the real danger that different operators may be applied in
7068 -- various parts of the program.
7070 -- Note that if E and S have the same scope, there is never any
7071 -- hiding. Either the two conflict, and the program is illegal,
7072 -- or S is overriding an implicit inherited subprogram.
7074 if Scope
(E
) /= Scope
(S
)
7075 and then (not Is_Overloadable
(E
)
7076 or else Subtype_Conformant
(E
, S
))
7077 and then (Is_Immediately_Visible
(E
)
7079 Is_Potentially_Use_Visible
(S
))
7081 if Scope
(E
) /= Standard_Standard
then
7082 Error_Msg_Sloc
:= Sloc
(E
);
7083 Error_Msg_N
("declaration of & hides one #?h?", S
);
7085 elsif Nkind
(S
) = N_Defining_Operator_Symbol
7087 Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /= Scope
(S
)
7090 ("declaration of & hides predefined operator?h?", S
);
7095 end Enter_Overloaded_Entity
;
7097 -----------------------------
7098 -- Check_Untagged_Equality --
7099 -----------------------------
7101 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
7102 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
7103 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
7107 -- This check applies only if we have a subprogram declaration with an
7108 -- untagged record type.
7110 if Nkind
(Decl
) /= N_Subprogram_Declaration
7111 or else not Is_Record_Type
(Typ
)
7112 or else Is_Tagged_Type
(Typ
)
7117 -- In Ada 2012 case, we will output errors or warnings depending on
7118 -- the setting of debug flag -gnatd.E.
7120 if Ada_Version
>= Ada_2012
then
7121 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
7123 -- In earlier versions of Ada, nothing to do unless we are warning on
7124 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
7127 if not Warn_On_Ada_2012_Compatibility
then
7132 -- Cases where the type has already been frozen
7134 if Is_Frozen
(Typ
) then
7136 -- If the type is not declared in a package, or if we are in the body
7137 -- of the package or in some other scope, the new operation is not
7138 -- primitive, and therefore legal, though suspicious. Should we
7139 -- generate a warning in this case ???
7141 if Ekind
(Scope
(Typ
)) /= E_Package
7142 or else Scope
(Typ
) /= Current_Scope
7146 -- If the type is a generic actual (sub)type, the operation is not
7147 -- primitive either because the base type is declared elsewhere.
7149 elsif Is_Generic_Actual_Type
(Typ
) then
7152 -- Here we have a definite error of declaration after freezing
7155 if Ada_Version
>= Ada_2012
then
7157 ("equality operator must be declared before type & is "
7158 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
7160 -- In Ada 2012 mode with error turned to warning, output one
7161 -- more warning to warn that the equality operation may not
7162 -- compose. This is the consequence of ignoring the error.
7164 if Error_Msg_Warn
then
7165 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
7170 ("equality operator must be declared before type& is "
7171 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
7174 -- If we are in the package body, we could just move the
7175 -- declaration to the package spec, so add a message saying that.
7177 if In_Package_Body
(Scope
(Typ
)) then
7178 if Ada_Version
>= Ada_2012
then
7180 ("\move declaration to package spec<<", Eq_Op
);
7183 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
7186 -- Otherwise try to find the freezing point
7189 Obj_Decl
:= Next
(Parent
(Typ
));
7190 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
7191 if Nkind
(Obj_Decl
) = N_Object_Declaration
7192 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
7194 -- Freezing point, output warnings
7196 if Ada_Version
>= Ada_2012
then
7198 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
7200 ("\an equality operator cannot be declared after "
7205 ("type& is frozen by declaration (Ada 2012)?y?",
7208 ("\an equality operator cannot be declared after "
7209 & "this point (Ada 2012)?y?",
7221 -- Here if type is not frozen yet. It is illegal to have a primitive
7222 -- equality declared in the private part if the type is visible.
7224 elsif not In_Same_List
(Parent
(Typ
), Decl
)
7225 and then not Is_Limited_Type
(Typ
)
7227 -- Shouldn't we give an RM reference here???
7229 if Ada_Version
>= Ada_2012
then
7231 ("equality operator appears too late<<", Eq_Op
);
7234 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
7237 -- No error detected
7242 end Check_Untagged_Equality
;
7244 -----------------------------
7245 -- Find_Corresponding_Spec --
7246 -----------------------------
7248 function Find_Corresponding_Spec
7250 Post_Error
: Boolean := True) return Entity_Id
7252 Spec
: constant Node_Id
:= Specification
(N
);
7253 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
7257 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
7258 -- Even if fully conformant, a body may depend on a generic actual when
7259 -- the spec does not, or vice versa, in which case they were distinct
7260 -- entities in the generic.
7262 -------------------------------
7263 -- Different_Generic_Profile --
7264 -------------------------------
7266 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
7269 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
7270 -- Check that the types of corresponding formals have the same
7271 -- generic actual if any. We have to account for subtypes of a
7272 -- generic formal, declared between a spec and a body, which may
7273 -- appear distinct in an instance but matched in the generic, and
7274 -- the subtype may be used either in the spec or the body of the
7275 -- subprogram being checked.
7277 -------------------------
7278 -- Same_Generic_Actual --
7279 -------------------------
7281 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
7283 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
7284 -- Predicate to check whether S1 is a subtype of S2 in the source
7287 -------------------------
7288 -- Is_Declared_Subtype --
7289 -------------------------
7291 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
7293 return Comes_From_Source
(Parent
(S1
))
7294 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
7295 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
7296 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
7297 end Is_Declared_Subtype
;
7299 -- Start of processing for Same_Generic_Actual
7302 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
7303 or else Is_Declared_Subtype
(T1
, T2
)
7304 or else Is_Declared_Subtype
(T2
, T1
);
7305 end Same_Generic_Actual
;
7307 -- Start of processing for Different_Generic_Profile
7310 if not In_Instance
then
7313 elsif Ekind
(E
) = E_Function
7314 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
7319 F1
:= First_Formal
(Designator
);
7320 F2
:= First_Formal
(E
);
7321 while Present
(F1
) loop
7322 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
7331 end Different_Generic_Profile
;
7333 -- Start of processing for Find_Corresponding_Spec
7336 E
:= Current_Entity
(Designator
);
7337 while Present
(E
) loop
7339 -- We are looking for a matching spec. It must have the same scope,
7340 -- and the same name, and either be type conformant, or be the case
7341 -- of a library procedure spec and its body (which belong to one
7342 -- another regardless of whether they are type conformant or not).
7344 if Scope
(E
) = Current_Scope
then
7345 if Current_Scope
= Standard_Standard
7346 or else (Ekind
(E
) = Ekind
(Designator
)
7347 and then Type_Conformant
(E
, Designator
))
7349 -- Within an instantiation, we know that spec and body are
7350 -- subtype conformant, because they were subtype conformant in
7351 -- the generic. We choose the subtype-conformant entity here as
7352 -- well, to resolve spurious ambiguities in the instance that
7353 -- were not present in the generic (i.e. when two different
7354 -- types are given the same actual). If we are looking for a
7355 -- spec to match a body, full conformance is expected.
7359 -- Inherit the convention and "ghostness" of the matching
7360 -- spec to ensure proper full and subtype conformance.
7362 Set_Convention
(Designator
, Convention
(E
));
7364 if Is_Ghost_Entity
(E
) then
7365 Set_Is_Ghost_Entity
(Designator
);
7368 -- Skip past subprogram bodies and subprogram renamings that
7369 -- may appear to have a matching spec, but that aren't fully
7370 -- conformant with it. That can occur in cases where an
7371 -- actual type causes unrelated homographs in the instance.
7373 if Nkind_In
(N
, N_Subprogram_Body
,
7374 N_Subprogram_Renaming_Declaration
)
7375 and then Present
(Homonym
(E
))
7376 and then not Fully_Conformant
(Designator
, E
)
7380 elsif not Subtype_Conformant
(Designator
, E
) then
7383 elsif Different_Generic_Profile
(E
) then
7388 -- Ada 2012 (AI05-0165): For internally generated bodies of
7389 -- null procedures locate the internally generated spec. We
7390 -- enforce mode conformance since a tagged type may inherit
7391 -- from interfaces several null primitives which differ only
7392 -- in the mode of the formals.
7394 if not (Comes_From_Source
(E
))
7395 and then Is_Null_Procedure
(E
)
7396 and then not Mode_Conformant
(Designator
, E
)
7400 -- For null procedures coming from source that are completions,
7401 -- analysis of the generated body will establish the link.
7403 elsif Comes_From_Source
(E
)
7404 and then Nkind
(Spec
) = N_Procedure_Specification
7405 and then Null_Present
(Spec
)
7409 elsif not Has_Completion
(E
) then
7410 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
7411 Set_Corresponding_Spec
(N
, E
);
7414 Set_Has_Completion
(E
);
7417 elsif Nkind
(Parent
(N
)) = N_Subunit
then
7419 -- If this is the proper body of a subunit, the completion
7420 -- flag is set when analyzing the stub.
7424 -- If E is an internal function with a controlling result that
7425 -- was created for an operation inherited by a null extension,
7426 -- it may be overridden by a body without a previous spec (one
7427 -- more reason why these should be shunned). In that case we
7428 -- remove the generated body if present, because the current
7429 -- one is the explicit overriding.
7431 elsif Ekind
(E
) = E_Function
7432 and then Ada_Version
>= Ada_2005
7433 and then not Comes_From_Source
(E
)
7434 and then Has_Controlling_Result
(E
)
7435 and then Is_Null_Extension
(Etype
(E
))
7436 and then Comes_From_Source
(Spec
)
7438 Set_Has_Completion
(E
, False);
7441 and then Nkind
(Parent
(E
)) = N_Function_Specification
7444 (Unit_Declaration_Node
7445 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
7449 -- If expansion is disabled, or if the wrapper function has
7450 -- not been generated yet, this a late body overriding an
7451 -- inherited operation, or it is an overriding by some other
7452 -- declaration before the controlling result is frozen. In
7453 -- either case this is a declaration of a new entity.
7459 -- If the body already exists, then this is an error unless
7460 -- the previous declaration is the implicit declaration of a
7461 -- derived subprogram. It is also legal for an instance to
7462 -- contain type conformant overloadable declarations (but the
7463 -- generic declaration may not), per 8.3(26/2).
7465 elsif No
(Alias
(E
))
7466 and then not Is_Intrinsic_Subprogram
(E
)
7467 and then not In_Instance
7470 Error_Msg_Sloc
:= Sloc
(E
);
7472 if Is_Imported
(E
) then
7474 ("body not allowed for imported subprogram & declared#",
7477 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
7481 -- Child units cannot be overloaded, so a conformance mismatch
7482 -- between body and a previous spec is an error.
7484 elsif Is_Child_Unit
(E
)
7486 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
7488 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
7493 ("body of child unit does not match previous declaration", N
);
7501 -- On exit, we know that no previous declaration of subprogram exists
7504 end Find_Corresponding_Spec
;
7506 ----------------------
7507 -- Fully_Conformant --
7508 ----------------------
7510 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
7513 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
7515 end Fully_Conformant
;
7517 ----------------------------------
7518 -- Fully_Conformant_Expressions --
7519 ----------------------------------
7521 function Fully_Conformant_Expressions
7522 (Given_E1
: Node_Id
;
7523 Given_E2
: Node_Id
) return Boolean
7525 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
7526 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
7527 -- We always test conformance on original nodes, since it is possible
7528 -- for analysis and/or expansion to make things look as though they
7529 -- conform when they do not, e.g. by converting 1+2 into 3.
7531 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
7532 renames Fully_Conformant_Expressions
;
7534 function FCL
(L1
, L2
: List_Id
) return Boolean;
7535 -- Compare elements of two lists for conformance. Elements have to be
7536 -- conformant, and actuals inserted as default parameters do not match
7537 -- explicit actuals with the same value.
7539 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
7540 -- Compare an operator node with a function call
7546 function FCL
(L1
, L2
: List_Id
) return Boolean is
7550 if L1
= No_List
then
7556 if L2
= No_List
then
7562 -- Compare two lists, skipping rewrite insertions (we want to compare
7563 -- the original trees, not the expanded versions).
7566 if Is_Rewrite_Insertion
(N1
) then
7568 elsif Is_Rewrite_Insertion
(N2
) then
7574 elsif not FCE
(N1
, N2
) then
7587 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
7588 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
7593 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
7598 Act
:= First
(Actuals
);
7600 if Nkind
(Op_Node
) in N_Binary_Op
then
7601 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
7608 return Present
(Act
)
7609 and then FCE
(Right_Opnd
(Op_Node
), Act
)
7610 and then No
(Next
(Act
));
7614 -- Start of processing for Fully_Conformant_Expressions
7617 -- Non-conformant if paren count does not match. Note: if some idiot
7618 -- complains that we don't do this right for more than 3 levels of
7619 -- parentheses, they will be treated with the respect they deserve.
7621 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
7624 -- If same entities are referenced, then they are conformant even if
7625 -- they have different forms (RM 8.3.1(19-20)).
7627 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
7628 if Present
(Entity
(E1
)) then
7629 return Entity
(E1
) = Entity
(E2
)
7630 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
7631 and then Ekind
(Entity
(E1
)) = E_Discriminant
7632 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
7634 elsif Nkind
(E1
) = N_Expanded_Name
7635 and then Nkind
(E2
) = N_Expanded_Name
7636 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7637 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7639 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
7642 -- Identifiers in component associations don't always have
7643 -- entities, but their names must conform.
7645 return Nkind
(E1
) = N_Identifier
7646 and then Nkind
(E2
) = N_Identifier
7647 and then Chars
(E1
) = Chars
(E2
);
7650 elsif Nkind
(E1
) = N_Character_Literal
7651 and then Nkind
(E2
) = N_Expanded_Name
7653 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7654 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
7656 elsif Nkind
(E2
) = N_Character_Literal
7657 and then Nkind
(E1
) = N_Expanded_Name
7659 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7660 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
7662 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
7663 return FCO
(E1
, E2
);
7665 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
7666 return FCO
(E2
, E1
);
7668 -- Otherwise we must have the same syntactic entity
7670 elsif Nkind
(E1
) /= Nkind
(E2
) then
7673 -- At this point, we specialize by node type
7680 FCL
(Expressions
(E1
), Expressions
(E2
))
7682 FCL
(Component_Associations
(E1
),
7683 Component_Associations
(E2
));
7686 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
7688 Nkind
(Expression
(E2
)) = N_Qualified_Expression
7690 return FCE
(Expression
(E1
), Expression
(E2
));
7692 -- Check that the subtype marks and any constraints
7697 Indic1
: constant Node_Id
:= Expression
(E1
);
7698 Indic2
: constant Node_Id
:= Expression
(E2
);
7703 if Nkind
(Indic1
) /= N_Subtype_Indication
then
7705 Nkind
(Indic2
) /= N_Subtype_Indication
7706 and then Entity
(Indic1
) = Entity
(Indic2
);
7708 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
7710 Nkind
(Indic1
) /= N_Subtype_Indication
7711 and then Entity
(Indic1
) = Entity
(Indic2
);
7714 if Entity
(Subtype_Mark
(Indic1
)) /=
7715 Entity
(Subtype_Mark
(Indic2
))
7720 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
7721 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
7722 while Present
(Elt1
) and then Present
(Elt2
) loop
7723 if not FCE
(Elt1
, Elt2
) then
7736 when N_Attribute_Reference
=>
7738 Attribute_Name
(E1
) = Attribute_Name
(E2
)
7739 and then FCL
(Expressions
(E1
), Expressions
(E2
));
7743 Entity
(E1
) = Entity
(E2
)
7744 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7745 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7747 when N_Short_Circuit | N_Membership_Test
=>
7749 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7751 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7753 when N_Case_Expression
=>
7759 if not FCE
(Expression
(E1
), Expression
(E2
)) then
7763 Alt1
:= First
(Alternatives
(E1
));
7764 Alt2
:= First
(Alternatives
(E2
));
7766 if Present
(Alt1
) /= Present
(Alt2
) then
7768 elsif No
(Alt1
) then
7772 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
7773 or else not FCL
(Discrete_Choices
(Alt1
),
7774 Discrete_Choices
(Alt2
))
7785 when N_Character_Literal
=>
7787 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
7789 when N_Component_Association
=>
7791 FCL
(Choices
(E1
), Choices
(E2
))
7793 FCE
(Expression
(E1
), Expression
(E2
));
7795 when N_Explicit_Dereference
=>
7797 FCE
(Prefix
(E1
), Prefix
(E2
));
7799 when N_Extension_Aggregate
=>
7801 FCL
(Expressions
(E1
), Expressions
(E2
))
7802 and then Null_Record_Present
(E1
) =
7803 Null_Record_Present
(E2
)
7804 and then FCL
(Component_Associations
(E1
),
7805 Component_Associations
(E2
));
7807 when N_Function_Call
=>
7809 FCE
(Name
(E1
), Name
(E2
))
7811 FCL
(Parameter_Associations
(E1
),
7812 Parameter_Associations
(E2
));
7814 when N_If_Expression
=>
7816 FCL
(Expressions
(E1
), Expressions
(E2
));
7818 when N_Indexed_Component
=>
7820 FCE
(Prefix
(E1
), Prefix
(E2
))
7822 FCL
(Expressions
(E1
), Expressions
(E2
));
7824 when N_Integer_Literal
=>
7825 return (Intval
(E1
) = Intval
(E2
));
7830 when N_Operator_Symbol
=>
7832 Chars
(E1
) = Chars
(E2
);
7834 when N_Others_Choice
=>
7837 when N_Parameter_Association
=>
7839 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
7840 and then FCE
(Explicit_Actual_Parameter
(E1
),
7841 Explicit_Actual_Parameter
(E2
));
7843 when N_Qualified_Expression
=>
7845 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7847 FCE
(Expression
(E1
), Expression
(E2
));
7849 when N_Quantified_Expression
=>
7850 if not FCE
(Condition
(E1
), Condition
(E2
)) then
7854 if Present
(Loop_Parameter_Specification
(E1
))
7855 and then Present
(Loop_Parameter_Specification
(E2
))
7858 L1
: constant Node_Id
:=
7859 Loop_Parameter_Specification
(E1
);
7860 L2
: constant Node_Id
:=
7861 Loop_Parameter_Specification
(E2
);
7865 Reverse_Present
(L1
) = Reverse_Present
(L2
)
7867 FCE
(Defining_Identifier
(L1
),
7868 Defining_Identifier
(L2
))
7870 FCE
(Discrete_Subtype_Definition
(L1
),
7871 Discrete_Subtype_Definition
(L2
));
7874 elsif Present
(Iterator_Specification
(E1
))
7875 and then Present
(Iterator_Specification
(E2
))
7878 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
7879 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
7883 FCE
(Defining_Identifier
(I1
),
7884 Defining_Identifier
(I2
))
7886 Of_Present
(I1
) = Of_Present
(I2
)
7888 Reverse_Present
(I1
) = Reverse_Present
(I2
)
7889 and then FCE
(Name
(I1
), Name
(I2
))
7890 and then FCE
(Subtype_Indication
(I1
),
7891 Subtype_Indication
(I2
));
7894 -- The quantified expressions used different specifications to
7895 -- walk their respective ranges.
7903 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
7905 FCE
(High_Bound
(E1
), High_Bound
(E2
));
7907 when N_Real_Literal
=>
7908 return (Realval
(E1
) = Realval
(E2
));
7910 when N_Selected_Component
=>
7912 FCE
(Prefix
(E1
), Prefix
(E2
))
7914 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
7918 FCE
(Prefix
(E1
), Prefix
(E2
))
7920 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
7922 when N_String_Literal
=>
7924 S1
: constant String_Id
:= Strval
(E1
);
7925 S2
: constant String_Id
:= Strval
(E2
);
7926 L1
: constant Nat
:= String_Length
(S1
);
7927 L2
: constant Nat
:= String_Length
(S2
);
7934 for J
in 1 .. L1
loop
7935 if Get_String_Char
(S1
, J
) /=
7936 Get_String_Char
(S2
, J
)
7946 when N_Type_Conversion
=>
7948 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7950 FCE
(Expression
(E1
), Expression
(E2
));
7954 Entity
(E1
) = Entity
(E2
)
7956 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7958 when N_Unchecked_Type_Conversion
=>
7960 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7962 FCE
(Expression
(E1
), Expression
(E2
));
7964 -- All other node types cannot appear in this context. Strictly
7965 -- we should raise a fatal internal error. Instead we just ignore
7966 -- the nodes. This means that if anyone makes a mistake in the
7967 -- expander and mucks an expression tree irretrievably, the result
7968 -- will be a failure to detect a (probably very obscure) case
7969 -- of non-conformance, which is better than bombing on some
7970 -- case where two expressions do in fact conform.
7977 end Fully_Conformant_Expressions
;
7979 ----------------------------------------
7980 -- Fully_Conformant_Discrete_Subtypes --
7981 ----------------------------------------
7983 function Fully_Conformant_Discrete_Subtypes
7984 (Given_S1
: Node_Id
;
7985 Given_S2
: Node_Id
) return Boolean
7987 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
7988 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
7990 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
7991 -- Special-case for a bound given by a discriminant, which in the body
7992 -- is replaced with the discriminal of the enclosing type.
7994 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
7995 -- Check both bounds
7997 -----------------------
7998 -- Conforming_Bounds --
7999 -----------------------
8001 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
8003 if Is_Entity_Name
(B1
)
8004 and then Is_Entity_Name
(B2
)
8005 and then Ekind
(Entity
(B1
)) = E_Discriminant
8007 return Chars
(B1
) = Chars
(B2
);
8010 return Fully_Conformant_Expressions
(B1
, B2
);
8012 end Conforming_Bounds
;
8014 -----------------------
8015 -- Conforming_Ranges --
8016 -----------------------
8018 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
8021 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
8023 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
8024 end Conforming_Ranges
;
8026 -- Start of processing for Fully_Conformant_Discrete_Subtypes
8029 if Nkind
(S1
) /= Nkind
(S2
) then
8032 elsif Is_Entity_Name
(S1
) then
8033 return Entity
(S1
) = Entity
(S2
);
8035 elsif Nkind
(S1
) = N_Range
then
8036 return Conforming_Ranges
(S1
, S2
);
8038 elsif Nkind
(S1
) = N_Subtype_Indication
then
8040 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
8043 (Range_Expression
(Constraint
(S1
)),
8044 Range_Expression
(Constraint
(S2
)));
8048 end Fully_Conformant_Discrete_Subtypes
;
8050 --------------------
8051 -- Install_Entity --
8052 --------------------
8054 procedure Install_Entity
(E
: Entity_Id
) is
8055 Prev
: constant Entity_Id
:= Current_Entity
(E
);
8057 Set_Is_Immediately_Visible
(E
);
8058 Set_Current_Entity
(E
);
8059 Set_Homonym
(E
, Prev
);
8062 ---------------------
8063 -- Install_Formals --
8064 ---------------------
8066 procedure Install_Formals
(Id
: Entity_Id
) is
8069 F
:= First_Formal
(Id
);
8070 while Present
(F
) loop
8074 end Install_Formals
;
8076 -----------------------------
8077 -- Is_Interface_Conformant --
8078 -----------------------------
8080 function Is_Interface_Conformant
8081 (Tagged_Type
: Entity_Id
;
8082 Iface_Prim
: Entity_Id
;
8083 Prim
: Entity_Id
) return Boolean
8085 -- The operation may in fact be an inherited (implicit) operation
8086 -- rather than the original interface primitive, so retrieve the
8087 -- ultimate ancestor.
8089 Iface
: constant Entity_Id
:=
8090 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
8091 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
8093 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
8094 -- Return the controlling formal of Prim
8096 ------------------------
8097 -- Controlling_Formal --
8098 ------------------------
8100 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
8104 E
:= First_Entity
(Prim
);
8105 while Present
(E
) loop
8106 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
8114 end Controlling_Formal
;
8118 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
8119 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
8121 -- Start of processing for Is_Interface_Conformant
8124 pragma Assert
(Is_Subprogram
(Iface_Prim
)
8125 and then Is_Subprogram
(Prim
)
8126 and then Is_Dispatching_Operation
(Iface_Prim
)
8127 and then Is_Dispatching_Operation
(Prim
));
8129 pragma Assert
(Is_Interface
(Iface
)
8130 or else (Present
(Alias
(Iface_Prim
))
8133 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
8135 if Prim
= Iface_Prim
8136 or else not Is_Subprogram
(Prim
)
8137 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
8138 or else not Is_Dispatching_Operation
(Prim
)
8139 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
8141 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
8142 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
8146 -- The mode of the controlling formals must match
8148 elsif Present
(Iface_Ctrl_F
)
8149 and then Present
(Prim_Ctrl_F
)
8150 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
8154 -- Case of a procedure, or a function whose result type matches the
8155 -- result type of the interface primitive, or a function that has no
8156 -- controlling result (I or access I).
8158 elsif Ekind
(Iface_Prim
) = E_Procedure
8159 or else Etype
(Prim
) = Etype
(Iface_Prim
)
8160 or else not Has_Controlling_Result
(Prim
)
8162 return Type_Conformant
8163 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
8165 -- Case of a function returning an interface, or an access to one. Check
8166 -- that the return types correspond.
8168 elsif Implements_Interface
(Typ
, Iface
) then
8169 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
8171 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
8176 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
8177 Skip_Controlling_Formals
=> True);
8183 end Is_Interface_Conformant
;
8185 ---------------------------------
8186 -- Is_Non_Overriding_Operation --
8187 ---------------------------------
8189 function Is_Non_Overriding_Operation
8190 (Prev_E
: Entity_Id
;
8191 New_E
: Entity_Id
) return Boolean
8195 G_Typ
: Entity_Id
:= Empty
;
8197 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
8198 -- If F_Type is a derived type associated with a generic actual subtype,
8199 -- then return its Generic_Parent_Type attribute, else return Empty.
8201 function Types_Correspond
8202 (P_Type
: Entity_Id
;
8203 N_Type
: Entity_Id
) return Boolean;
8204 -- Returns true if and only if the types (or designated types in the
8205 -- case of anonymous access types) are the same or N_Type is derived
8206 -- directly or indirectly from P_Type.
8208 -----------------------------
8209 -- Get_Generic_Parent_Type --
8210 -----------------------------
8212 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
8218 if Is_Derived_Type
(F_Typ
)
8219 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
8221 -- The tree must be traversed to determine the parent subtype in
8222 -- the generic unit, which unfortunately isn't always available
8223 -- via semantic attributes. ??? (Note: The use of Original_Node
8224 -- is needed for cases where a full derived type has been
8227 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
8228 if Nkind
(Defn
) = N_Derived_Type_Definition
then
8229 Indic
:= Subtype_Indication
(Defn
);
8231 if Nkind
(Indic
) = N_Subtype_Indication
then
8232 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
8234 G_Typ
:= Entity
(Indic
);
8237 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
8238 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
8240 return Generic_Parent_Type
(Parent
(G_Typ
));
8246 end Get_Generic_Parent_Type
;
8248 ----------------------
8249 -- Types_Correspond --
8250 ----------------------
8252 function Types_Correspond
8253 (P_Type
: Entity_Id
;
8254 N_Type
: Entity_Id
) return Boolean
8256 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
8257 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
8260 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
8261 Prev_Type
:= Designated_Type
(Prev_Type
);
8264 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
8265 New_Type
:= Designated_Type
(New_Type
);
8268 if Prev_Type
= New_Type
then
8271 elsif not Is_Class_Wide_Type
(New_Type
) then
8272 while Etype
(New_Type
) /= New_Type
loop
8273 New_Type
:= Etype
(New_Type
);
8274 if New_Type
= Prev_Type
then
8280 end Types_Correspond
;
8282 -- Start of processing for Is_Non_Overriding_Operation
8285 -- In the case where both operations are implicit derived subprograms
8286 -- then neither overrides the other. This can only occur in certain
8287 -- obscure cases (e.g., derivation from homographs created in a generic
8290 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
8293 elsif Ekind
(Current_Scope
) = E_Package
8294 and then Is_Generic_Instance
(Current_Scope
)
8295 and then In_Private_Part
(Current_Scope
)
8296 and then Comes_From_Source
(New_E
)
8298 -- We examine the formals and result type of the inherited operation,
8299 -- to determine whether their type is derived from (the instance of)
8300 -- a generic type. The first such formal or result type is the one
8303 Formal
:= First_Formal
(Prev_E
);
8304 while Present
(Formal
) loop
8305 F_Typ
:= Base_Type
(Etype
(Formal
));
8307 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
8308 F_Typ
:= Designated_Type
(F_Typ
);
8311 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
8312 exit when Present
(G_Typ
);
8314 Next_Formal
(Formal
);
8317 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
8318 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
8325 -- If the generic type is a private type, then the original operation
8326 -- was not overriding in the generic, because there was no primitive
8327 -- operation to override.
8329 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
8330 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
8331 N_Formal_Private_Type_Definition
8335 -- The generic parent type is the ancestor of a formal derived
8336 -- type declaration. We need to check whether it has a primitive
8337 -- operation that should be overridden by New_E in the generic.
8341 P_Formal
: Entity_Id
;
8342 N_Formal
: Entity_Id
;
8346 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
8349 while Present
(Prim_Elt
) loop
8350 P_Prim
:= Node
(Prim_Elt
);
8352 if Chars
(P_Prim
) = Chars
(New_E
)
8353 and then Ekind
(P_Prim
) = Ekind
(New_E
)
8355 P_Formal
:= First_Formal
(P_Prim
);
8356 N_Formal
:= First_Formal
(New_E
);
8357 while Present
(P_Formal
) and then Present
(N_Formal
) loop
8358 P_Typ
:= Etype
(P_Formal
);
8359 N_Typ
:= Etype
(N_Formal
);
8361 if not Types_Correspond
(P_Typ
, N_Typ
) then
8365 Next_Entity
(P_Formal
);
8366 Next_Entity
(N_Formal
);
8369 -- Found a matching primitive operation belonging to the
8370 -- formal ancestor type, so the new subprogram is
8374 and then No
(N_Formal
)
8375 and then (Ekind
(New_E
) /= E_Function
8378 (Etype
(P_Prim
), Etype
(New_E
)))
8384 Next_Elmt
(Prim_Elt
);
8387 -- If no match found, then the new subprogram does not override
8388 -- in the generic (nor in the instance).
8390 -- If the type in question is not abstract, and the subprogram
8391 -- is, this will be an error if the new operation is in the
8392 -- private part of the instance. Emit a warning now, which will
8393 -- make the subsequent error message easier to understand.
8395 if not Is_Abstract_Type
(F_Typ
)
8396 and then Is_Abstract_Subprogram
(Prev_E
)
8397 and then In_Private_Part
(Current_Scope
)
8399 Error_Msg_Node_2
:= F_Typ
;
8401 ("private operation& in generic unit does not override "
8402 & "any primitive operation of& (RM 12.3 (18))??",
8412 end Is_Non_Overriding_Operation
;
8414 -------------------------------------
8415 -- List_Inherited_Pre_Post_Aspects --
8416 -------------------------------------
8418 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
8420 if Opt
.List_Inherited_Aspects
8421 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
8424 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
8429 for Index
in Subps
'Range loop
8430 Items
:= Contract
(Subps
(Index
));
8432 if Present
(Items
) then
8433 Prag
:= Pre_Post_Conditions
(Items
);
8434 while Present
(Prag
) loop
8435 Error_Msg_Sloc
:= Sloc
(Prag
);
8437 if Class_Present
(Prag
)
8438 and then not Split_PPC
(Prag
)
8440 if Pragma_Name
(Prag
) = Name_Precondition
then
8442 ("info: & inherits `Pre''Class` aspect from "
8446 ("info: & inherits `Post''Class` aspect from "
8451 Prag
:= Next_Pragma
(Prag
);
8457 end List_Inherited_Pre_Post_Aspects
;
8459 ------------------------------
8460 -- Make_Inequality_Operator --
8461 ------------------------------
8463 -- S is the defining identifier of an equality operator. We build a
8464 -- subprogram declaration with the right signature. This operation is
8465 -- intrinsic, because it is always expanded as the negation of the
8466 -- call to the equality function.
8468 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
8469 Loc
: constant Source_Ptr
:= Sloc
(S
);
8472 Op_Name
: Entity_Id
;
8474 FF
: constant Entity_Id
:= First_Formal
(S
);
8475 NF
: constant Entity_Id
:= Next_Formal
(FF
);
8478 -- Check that equality was properly defined, ignore call if not
8485 A
: constant Entity_Id
:=
8486 Make_Defining_Identifier
(Sloc
(FF
),
8487 Chars
=> Chars
(FF
));
8489 B
: constant Entity_Id
:=
8490 Make_Defining_Identifier
(Sloc
(NF
),
8491 Chars
=> Chars
(NF
));
8494 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
8496 Formals
:= New_List
(
8497 Make_Parameter_Specification
(Loc
,
8498 Defining_Identifier
=> A
,
8500 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
8501 Sloc
(Etype
(First_Formal
(S
))))),
8503 Make_Parameter_Specification
(Loc
,
8504 Defining_Identifier
=> B
,
8506 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
8507 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
8510 Make_Subprogram_Declaration
(Loc
,
8512 Make_Function_Specification
(Loc
,
8513 Defining_Unit_Name
=> Op_Name
,
8514 Parameter_Specifications
=> Formals
,
8515 Result_Definition
=>
8516 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
8518 -- Insert inequality right after equality if it is explicit or after
8519 -- the derived type when implicit. These entities are created only
8520 -- for visibility purposes, and eventually replaced in the course
8521 -- of expansion, so they do not need to be attached to the tree and
8522 -- seen by the back-end. Keeping them internal also avoids spurious
8523 -- freezing problems. The declaration is inserted in the tree for
8524 -- analysis, and removed afterwards. If the equality operator comes
8525 -- from an explicit declaration, attach the inequality immediately
8526 -- after. Else the equality is inherited from a derived type
8527 -- declaration, so insert inequality after that declaration.
8529 if No
(Alias
(S
)) then
8530 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
8531 elsif Is_List_Member
(Parent
(S
)) then
8532 Insert_After
(Parent
(S
), Decl
);
8534 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
8537 Mark_Rewrite_Insertion
(Decl
);
8538 Set_Is_Intrinsic_Subprogram
(Op_Name
);
8541 Set_Has_Completion
(Op_Name
);
8542 Set_Corresponding_Equality
(Op_Name
, S
);
8543 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
8545 end Make_Inequality_Operator
;
8547 ----------------------
8548 -- May_Need_Actuals --
8549 ----------------------
8551 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
8556 F
:= First_Formal
(Fun
);
8558 while Present
(F
) loop
8559 if No
(Default_Value
(F
)) then
8567 Set_Needs_No_Actuals
(Fun
, B
);
8568 end May_Need_Actuals
;
8570 ---------------------
8571 -- Mode_Conformant --
8572 ---------------------
8574 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8577 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
8579 end Mode_Conformant
;
8581 ---------------------------
8582 -- New_Overloaded_Entity --
8583 ---------------------------
8585 procedure New_Overloaded_Entity
8587 Derived_Type
: Entity_Id
:= Empty
)
8589 Overridden_Subp
: Entity_Id
:= Empty
;
8590 -- Set if the current scope has an operation that is type-conformant
8591 -- with S, and becomes hidden by S.
8593 Is_Primitive_Subp
: Boolean;
8594 -- Set to True if the new subprogram is primitive
8597 -- Entity that S overrides
8599 Prev_Vis
: Entity_Id
:= Empty
;
8600 -- Predecessor of E in Homonym chain
8602 procedure Check_For_Primitive_Subprogram
8603 (Is_Primitive
: out Boolean;
8604 Is_Overriding
: Boolean := False);
8605 -- If the subprogram being analyzed is a primitive operation of the type
8606 -- of a formal or result, set the Has_Primitive_Operations flag on the
8607 -- type, and set Is_Primitive to True (otherwise set to False). Set the
8608 -- corresponding flag on the entity itself for later use.
8610 procedure Check_Synchronized_Overriding
8611 (Def_Id
: Entity_Id
;
8612 Overridden_Subp
: out Entity_Id
);
8613 -- First determine if Def_Id is an entry or a subprogram either defined
8614 -- in the scope of a task or protected type, or is a primitive of such
8615 -- a type. Check whether Def_Id overrides a subprogram of an interface
8616 -- implemented by the synchronized type, return the overridden entity
8619 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
8620 -- Check that E is declared in the private part of the current package,
8621 -- or in the package body, where it may hide a previous declaration.
8622 -- We can't use In_Private_Part by itself because this flag is also
8623 -- set when freezing entities, so we must examine the place of the
8624 -- declaration in the tree, and recognize wrapper packages as well.
8626 function Is_Overriding_Alias
8628 New_E
: Entity_Id
) return Boolean;
8629 -- Check whether new subprogram and old subprogram are both inherited
8630 -- from subprograms that have distinct dispatch table entries. This can
8631 -- occur with derivations from instances with accidental homonyms. The
8632 -- function is conservative given that the converse is only true within
8633 -- instances that contain accidental overloadings.
8635 ------------------------------------
8636 -- Check_For_Primitive_Subprogram --
8637 ------------------------------------
8639 procedure Check_For_Primitive_Subprogram
8640 (Is_Primitive
: out Boolean;
8641 Is_Overriding
: Boolean := False)
8647 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
8648 -- Returns true if T is declared in the visible part of the current
8649 -- package scope; otherwise returns false. Assumes that T is declared
8652 procedure Check_Private_Overriding
(T
: Entity_Id
);
8653 -- Checks that if a primitive abstract subprogram of a visible
8654 -- abstract type is declared in a private part, then it must override
8655 -- an abstract subprogram declared in the visible part. Also checks
8656 -- that if a primitive function with a controlling result is declared
8657 -- in a private part, then it must override a function declared in
8658 -- the visible part.
8660 ------------------------------
8661 -- Check_Private_Overriding --
8662 ------------------------------
8664 procedure Check_Private_Overriding
(T
: Entity_Id
) is
8666 function Overrides_Visible_Function
8667 (Partial_View
: Entity_Id
) return Boolean;
8668 -- True if S overrides a function in the visible part. The
8669 -- overridden function could be explicitly or implicitly declared.
8671 function Overrides_Visible_Function
8672 (Partial_View
: Entity_Id
) return Boolean
8675 if not Is_Overriding
or else not Has_Homonym
(S
) then
8679 if not Present
(Partial_View
) then
8683 -- Search through all the homonyms H of S in the current
8684 -- package spec, and return True if we find one that matches.
8685 -- Note that Parent (H) will be the declaration of the
8686 -- partial view of T for a match.
8693 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
8697 N_Private_Extension_Declaration
,
8698 N_Private_Type_Declaration
)
8699 and then Defining_Identifier
(Parent
(H
)) = Partial_View
8707 end Overrides_Visible_Function
;
8709 -- Start of processing for Check_Private_Overriding
8712 if Is_Package_Or_Generic_Package
(Current_Scope
)
8713 and then In_Private_Part
(Current_Scope
)
8714 and then Visible_Part_Type
(T
)
8715 and then not In_Instance
8717 if Is_Abstract_Type
(T
)
8718 and then Is_Abstract_Subprogram
(S
)
8719 and then (not Is_Overriding
8720 or else not Is_Abstract_Subprogram
(E
))
8722 Error_Msg_N
("abstract subprograms must be visible "
8723 & "(RM 3.9.3(10))!", S
);
8725 elsif Ekind
(S
) = E_Function
then
8727 Partial_View
: constant Entity_Id
:=
8728 Incomplete_Or_Partial_View
(T
);
8731 if not Overrides_Visible_Function
(Partial_View
) then
8733 -- Here, S is "function ... return T;" declared in
8734 -- the private part, not overriding some visible
8735 -- operation. That's illegal in the tagged case
8736 -- (but not if the private type is untagged).
8738 if ((Present
(Partial_View
)
8739 and then Is_Tagged_Type
(Partial_View
))
8740 or else (not Present
(Partial_View
)
8741 and then Is_Tagged_Type
(T
)))
8742 and then T
= Base_Type
(Etype
(S
))
8745 ("private function with tagged result must"
8746 & " override visible-part function", S
);
8748 ("\move subprogram to the visible part"
8749 & " (RM 3.9.3(10))", S
);
8751 -- AI05-0073: extend this test to the case of a
8752 -- function with a controlling access result.
8754 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
8755 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
8757 not Is_Class_Wide_Type
8758 (Designated_Type
(Etype
(S
)))
8759 and then Ada_Version
>= Ada_2012
8762 ("private function with controlling access "
8763 & "result must override visible-part function",
8766 ("\move subprogram to the visible part"
8767 & " (RM 3.9.3(10))", S
);
8773 end Check_Private_Overriding
;
8775 -----------------------
8776 -- Visible_Part_Type --
8777 -----------------------
8779 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
8780 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
8784 -- If the entity is a private type, then it must be declared in a
8787 if Ekind
(T
) in Private_Kind
then
8791 -- Otherwise, we traverse the visible part looking for its
8792 -- corresponding declaration. We cannot use the declaration
8793 -- node directly because in the private part the entity of a
8794 -- private type is the one in the full view, which does not
8795 -- indicate that it is the completion of something visible.
8797 N
:= First
(Visible_Declarations
(Specification
(P
)));
8798 while Present
(N
) loop
8799 if Nkind
(N
) = N_Full_Type_Declaration
8800 and then Present
(Defining_Identifier
(N
))
8801 and then T
= Defining_Identifier
(N
)
8805 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
8806 N_Private_Extension_Declaration
)
8807 and then Present
(Defining_Identifier
(N
))
8808 and then T
= Full_View
(Defining_Identifier
(N
))
8817 end Visible_Part_Type
;
8819 -- Start of processing for Check_For_Primitive_Subprogram
8822 Is_Primitive
:= False;
8824 if not Comes_From_Source
(S
) then
8827 -- If subprogram is at library level, it is not primitive operation
8829 elsif Current_Scope
= Standard_Standard
then
8832 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
8833 and then not In_Package_Body
(Current_Scope
))
8834 or else Is_Overriding
8836 -- For function, check return type
8838 if Ekind
(S
) = E_Function
then
8839 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
8840 F_Typ
:= Designated_Type
(Etype
(S
));
8845 B_Typ
:= Base_Type
(F_Typ
);
8847 if Scope
(B_Typ
) = Current_Scope
8848 and then not Is_Class_Wide_Type
(B_Typ
)
8849 and then not Is_Generic_Type
(B_Typ
)
8851 Is_Primitive
:= True;
8852 Set_Has_Primitive_Operations
(B_Typ
);
8853 Set_Is_Primitive
(S
);
8854 Check_Private_Overriding
(B_Typ
);
8858 -- For all subprograms, check formals
8860 Formal
:= First_Formal
(S
);
8861 while Present
(Formal
) loop
8862 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
8863 F_Typ
:= Designated_Type
(Etype
(Formal
));
8865 F_Typ
:= Etype
(Formal
);
8868 B_Typ
:= Base_Type
(F_Typ
);
8870 if Ekind
(B_Typ
) = E_Access_Subtype
then
8871 B_Typ
:= Base_Type
(B_Typ
);
8874 if Scope
(B_Typ
) = Current_Scope
8875 and then not Is_Class_Wide_Type
(B_Typ
)
8876 and then not Is_Generic_Type
(B_Typ
)
8878 Is_Primitive
:= True;
8879 Set_Is_Primitive
(S
);
8880 Set_Has_Primitive_Operations
(B_Typ
);
8881 Check_Private_Overriding
(B_Typ
);
8884 Next_Formal
(Formal
);
8887 -- Special case: An equality function can be redefined for a type
8888 -- occurring in a declarative part, and won't otherwise be treated as
8889 -- a primitive because it doesn't occur in a package spec and doesn't
8890 -- override an inherited subprogram. It's important that we mark it
8891 -- primitive so it can be returned by Collect_Primitive_Operations
8892 -- and be used in composing the equality operation of later types
8893 -- that have a component of the type.
8895 elsif Chars
(S
) = Name_Op_Eq
8896 and then Etype
(S
) = Standard_Boolean
8898 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
8900 if Scope
(B_Typ
) = Current_Scope
8902 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
8903 and then not Is_Limited_Type
(B_Typ
)
8905 Is_Primitive
:= True;
8906 Set_Is_Primitive
(S
);
8907 Set_Has_Primitive_Operations
(B_Typ
);
8908 Check_Private_Overriding
(B_Typ
);
8911 end Check_For_Primitive_Subprogram
;
8913 -----------------------------------
8914 -- Check_Synchronized_Overriding --
8915 -----------------------------------
8917 procedure Check_Synchronized_Overriding
8918 (Def_Id
: Entity_Id
;
8919 Overridden_Subp
: out Entity_Id
)
8921 Ifaces_List
: Elist_Id
;
8925 function Matches_Prefixed_View_Profile
8926 (Prim_Params
: List_Id
;
8927 Iface_Params
: List_Id
) return Boolean;
8928 -- Determine whether a subprogram's parameter profile Prim_Params
8929 -- matches that of a potentially overridden interface subprogram
8930 -- Iface_Params. Also determine if the type of first parameter of
8931 -- Iface_Params is an implemented interface.
8933 -----------------------------------
8934 -- Matches_Prefixed_View_Profile --
8935 -----------------------------------
8937 function Matches_Prefixed_View_Profile
8938 (Prim_Params
: List_Id
;
8939 Iface_Params
: List_Id
) return Boolean
8941 Iface_Id
: Entity_Id
;
8942 Iface_Param
: Node_Id
;
8943 Iface_Typ
: Entity_Id
;
8944 Prim_Id
: Entity_Id
;
8945 Prim_Param
: Node_Id
;
8946 Prim_Typ
: Entity_Id
;
8948 function Is_Implemented
8949 (Ifaces_List
: Elist_Id
;
8950 Iface
: Entity_Id
) return Boolean;
8951 -- Determine if Iface is implemented by the current task or
8954 --------------------
8955 -- Is_Implemented --
8956 --------------------
8958 function Is_Implemented
8959 (Ifaces_List
: Elist_Id
;
8960 Iface
: Entity_Id
) return Boolean
8962 Iface_Elmt
: Elmt_Id
;
8965 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
8966 while Present
(Iface_Elmt
) loop
8967 if Node
(Iface_Elmt
) = Iface
then
8971 Next_Elmt
(Iface_Elmt
);
8977 -- Start of processing for Matches_Prefixed_View_Profile
8980 Iface_Param
:= First
(Iface_Params
);
8981 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
8983 if Is_Access_Type
(Iface_Typ
) then
8984 Iface_Typ
:= Designated_Type
(Iface_Typ
);
8987 Prim_Param
:= First
(Prim_Params
);
8989 -- The first parameter of the potentially overridden subprogram
8990 -- must be an interface implemented by Prim.
8992 if not Is_Interface
(Iface_Typ
)
8993 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
8998 -- The checks on the object parameters are done, move onto the
8999 -- rest of the parameters.
9001 if not In_Scope
then
9002 Prim_Param
:= Next
(Prim_Param
);
9005 Iface_Param
:= Next
(Iface_Param
);
9006 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
9007 Iface_Id
:= Defining_Identifier
(Iface_Param
);
9008 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
9010 Prim_Id
:= Defining_Identifier
(Prim_Param
);
9011 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
9013 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
9014 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
9015 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
9017 Iface_Typ
:= Designated_Type
(Iface_Typ
);
9018 Prim_Typ
:= Designated_Type
(Prim_Typ
);
9021 -- Case of multiple interface types inside a parameter profile
9023 -- (Obj_Param : in out Iface; ...; Param : Iface)
9025 -- If the interface type is implemented, then the matching type
9026 -- in the primitive should be the implementing record type.
9028 if Ekind
(Iface_Typ
) = E_Record_Type
9029 and then Is_Interface
(Iface_Typ
)
9030 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
9032 if Prim_Typ
/= Typ
then
9036 -- The two parameters must be both mode and subtype conformant
9038 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
9040 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
9049 -- One of the two lists contains more parameters than the other
9051 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
9056 end Matches_Prefixed_View_Profile
;
9058 -- Start of processing for Check_Synchronized_Overriding
9061 Overridden_Subp
:= Empty
;
9063 -- Def_Id must be an entry or a subprogram. We should skip predefined
9064 -- primitives internally generated by the frontend; however at this
9065 -- stage predefined primitives are still not fully decorated. As a
9066 -- minor optimization we skip here internally generated subprograms.
9068 if (Ekind
(Def_Id
) /= E_Entry
9069 and then Ekind
(Def_Id
) /= E_Function
9070 and then Ekind
(Def_Id
) /= E_Procedure
)
9071 or else not Comes_From_Source
(Def_Id
)
9076 -- Search for the concurrent declaration since it contains the list
9077 -- of all implemented interfaces. In this case, the subprogram is
9078 -- declared within the scope of a protected or a task type.
9080 if Present
(Scope
(Def_Id
))
9081 and then Is_Concurrent_Type
(Scope
(Def_Id
))
9082 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
9084 Typ
:= Scope
(Def_Id
);
9087 -- The enclosing scope is not a synchronized type and the subprogram
9090 elsif No
(First_Formal
(Def_Id
)) then
9093 -- The subprogram has formals and hence it may be a primitive of a
9097 Typ
:= Etype
(First_Formal
(Def_Id
));
9099 if Is_Access_Type
(Typ
) then
9100 Typ
:= Directly_Designated_Type
(Typ
);
9103 if Is_Concurrent_Type
(Typ
)
9104 and then not Is_Generic_Actual_Type
(Typ
)
9108 -- This case occurs when the concurrent type is declared within
9109 -- a generic unit. As a result the corresponding record has been
9110 -- built and used as the type of the first formal, we just have
9111 -- to retrieve the corresponding concurrent type.
9113 elsif Is_Concurrent_Record_Type
(Typ
)
9114 and then not Is_Class_Wide_Type
(Typ
)
9115 and then Present
(Corresponding_Concurrent_Type
(Typ
))
9117 Typ
:= Corresponding_Concurrent_Type
(Typ
);
9125 -- There is no overriding to check if is an inherited operation in a
9126 -- type derivation on for a generic actual.
9128 Collect_Interfaces
(Typ
, Ifaces_List
);
9130 if Is_Empty_Elmt_List
(Ifaces_List
) then
9134 -- Determine whether entry or subprogram Def_Id overrides a primitive
9135 -- operation that belongs to one of the interfaces in Ifaces_List.
9138 Candidate
: Entity_Id
:= Empty
;
9139 Hom
: Entity_Id
:= Empty
;
9140 Subp
: Entity_Id
:= Empty
;
9143 -- Traverse the homonym chain, looking for a potentially
9144 -- overridden subprogram that belongs to an implemented
9147 Hom
:= Current_Entity_In_Scope
(Def_Id
);
9148 while Present
(Hom
) loop
9152 or else not Is_Overloadable
(Subp
)
9153 or else not Is_Primitive
(Subp
)
9154 or else not Is_Dispatching_Operation
(Subp
)
9155 or else not Present
(Find_Dispatching_Type
(Subp
))
9156 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
9160 -- Entries and procedures can override abstract or null
9161 -- interface procedures.
9163 elsif (Ekind
(Def_Id
) = E_Procedure
9164 or else Ekind
(Def_Id
) = E_Entry
)
9165 and then Ekind
(Subp
) = E_Procedure
9166 and then Matches_Prefixed_View_Profile
9167 (Parameter_Specifications
(Parent
(Def_Id
)),
9168 Parameter_Specifications
(Parent
(Subp
)))
9172 -- For an overridden subprogram Subp, check whether the mode
9173 -- of its first parameter is correct depending on the kind
9174 -- of synchronized type.
9177 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
9180 -- In order for an entry or a protected procedure to
9181 -- override, the first parameter of the overridden
9182 -- routine must be of mode "out", "in out" or
9183 -- access-to-variable.
9185 if Ekind_In
(Candidate
, E_Entry
, E_Procedure
)
9186 and then Is_Protected_Type
(Typ
)
9187 and then Ekind
(Formal
) /= E_In_Out_Parameter
9188 and then Ekind
(Formal
) /= E_Out_Parameter
9189 and then Nkind
(Parameter_Type
(Parent
(Formal
))) /=
9194 -- All other cases are OK since a task entry or routine
9195 -- does not have a restriction on the mode of the first
9196 -- parameter of the overridden interface routine.
9199 Overridden_Subp
:= Candidate
;
9204 -- Functions can override abstract interface functions
9206 elsif Ekind
(Def_Id
) = E_Function
9207 and then Ekind
(Subp
) = E_Function
9208 and then Matches_Prefixed_View_Profile
9209 (Parameter_Specifications
(Parent
(Def_Id
)),
9210 Parameter_Specifications
(Parent
(Subp
)))
9211 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
9212 Etype
(Result_Definition
(Parent
(Subp
)))
9216 -- If an inherited subprogram is implemented by a protected
9217 -- function, then the first parameter of the inherited
9218 -- subprogram shall be of mode in, but not an
9219 -- access-to-variable parameter (RM 9.4(11/9)
9221 if Present
(First_Formal
(Subp
))
9222 and then Ekind
(First_Formal
(Subp
)) = E_In_Parameter
9224 (not Is_Access_Type
(Etype
(First_Formal
(Subp
)))
9226 Is_Access_Constant
(Etype
(First_Formal
(Subp
))))
9228 Overridden_Subp
:= Subp
;
9233 Hom
:= Homonym
(Hom
);
9236 -- After examining all candidates for overriding, we are left with
9237 -- the best match which is a mode incompatible interface routine.
9239 if In_Scope
and then Present
(Candidate
) then
9240 Error_Msg_PT
(Def_Id
, Candidate
);
9243 Overridden_Subp
:= Candidate
;
9246 end Check_Synchronized_Overriding
;
9248 ----------------------------
9249 -- Is_Private_Declaration --
9250 ----------------------------
9252 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
9253 Priv_Decls
: List_Id
;
9254 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
9257 if Is_Package_Or_Generic_Package
(Current_Scope
)
9258 and then In_Private_Part
(Current_Scope
)
9261 Private_Declarations
(Package_Specification
(Current_Scope
));
9263 return In_Package_Body
(Current_Scope
)
9265 (Is_List_Member
(Decl
)
9266 and then List_Containing
(Decl
) = Priv_Decls
)
9267 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
9270 (Defining_Entity
(Parent
(Decl
)))
9271 and then List_Containing
(Parent
(Parent
(Decl
))) =
9276 end Is_Private_Declaration
;
9278 --------------------------
9279 -- Is_Overriding_Alias --
9280 --------------------------
9282 function Is_Overriding_Alias
9284 New_E
: Entity_Id
) return Boolean
9286 AO
: constant Entity_Id
:= Alias
(Old_E
);
9287 AN
: constant Entity_Id
:= Alias
(New_E
);
9289 return Scope
(AO
) /= Scope
(AN
)
9290 or else No
(DTC_Entity
(AO
))
9291 or else No
(DTC_Entity
(AN
))
9292 or else DT_Position
(AO
) = DT_Position
(AN
);
9293 end Is_Overriding_Alias
;
9295 -- Start of processing for New_Overloaded_Entity
9298 -- We need to look for an entity that S may override. This must be a
9299 -- homonym in the current scope, so we look for the first homonym of
9300 -- S in the current scope as the starting point for the search.
9302 E
:= Current_Entity_In_Scope
(S
);
9304 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
9305 -- They are directly added to the list of primitive operations of
9306 -- Derived_Type, unless this is a rederivation in the private part
9307 -- of an operation that was already derived in the visible part of
9308 -- the current package.
9310 if Ada_Version
>= Ada_2005
9311 and then Present
(Derived_Type
)
9312 and then Present
(Alias
(S
))
9313 and then Is_Dispatching_Operation
(Alias
(S
))
9314 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
9315 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
9317 -- For private types, when the full-view is processed we propagate to
9318 -- the full view the non-overridden entities whose attribute "alias"
9319 -- references an interface primitive. These entities were added by
9320 -- Derive_Subprograms to ensure that interface primitives are
9323 -- Inside_Freeze_Actions is non zero when S corresponds with an
9324 -- internal entity that links an interface primitive with its
9325 -- covering primitive through attribute Interface_Alias (see
9326 -- Add_Internal_Interface_Entities).
9328 if Inside_Freezing_Actions
= 0
9329 and then Is_Package_Or_Generic_Package
(Current_Scope
)
9330 and then In_Private_Part
(Current_Scope
)
9331 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
9332 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
9333 and then Full_View
(Defining_Identifier
(Parent
(E
)))
9334 = Defining_Identifier
(Parent
(S
))
9335 and then Alias
(E
) = Alias
(S
)
9337 Check_Operation_From_Private_View
(S
, E
);
9338 Set_Is_Dispatching_Operation
(S
);
9343 Enter_Overloaded_Entity
(S
);
9344 Check_Dispatching_Operation
(S
, Empty
);
9345 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9351 -- If there is no homonym then this is definitely not overriding
9354 Enter_Overloaded_Entity
(S
);
9355 Check_Dispatching_Operation
(S
, Empty
);
9356 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9358 -- If subprogram has an explicit declaration, check whether it has an
9359 -- overriding indicator.
9361 if Comes_From_Source
(S
) then
9362 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9364 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
9365 -- it may have overridden some hidden inherited primitive. Update
9366 -- Overridden_Subp to avoid spurious errors when checking the
9367 -- overriding indicator.
9369 if Ada_Version
>= Ada_2012
9370 and then No
(Overridden_Subp
)
9371 and then Is_Dispatching_Operation
(S
)
9372 and then Present
(Overridden_Operation
(S
))
9374 Overridden_Subp
:= Overridden_Operation
(S
);
9377 Check_Overriding_Indicator
9378 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9381 -- If there is a homonym that is not overloadable, then we have an
9382 -- error, except for the special cases checked explicitly below.
9384 elsif not Is_Overloadable
(E
) then
9386 -- Check for spurious conflict produced by a subprogram that has the
9387 -- same name as that of the enclosing generic package. The conflict
9388 -- occurs within an instance, between the subprogram and the renaming
9389 -- declaration for the package. After the subprogram, the package
9390 -- renaming declaration becomes hidden.
9392 if Ekind
(E
) = E_Package
9393 and then Present
(Renamed_Object
(E
))
9394 and then Renamed_Object
(E
) = Current_Scope
9395 and then Nkind
(Parent
(Renamed_Object
(E
))) =
9396 N_Package_Specification
9397 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
9400 Set_Is_Immediately_Visible
(E
, False);
9401 Enter_Overloaded_Entity
(S
);
9402 Set_Homonym
(S
, Homonym
(E
));
9403 Check_Dispatching_Operation
(S
, Empty
);
9404 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
9406 -- If the subprogram is implicit it is hidden by the previous
9407 -- declaration. However if it is dispatching, it must appear in the
9408 -- dispatch table anyway, because it can be dispatched to even if it
9409 -- cannot be called directly.
9411 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
9412 Set_Scope
(S
, Current_Scope
);
9414 if Is_Dispatching_Operation
(Alias
(S
)) then
9415 Check_Dispatching_Operation
(S
, Empty
);
9421 Error_Msg_Sloc
:= Sloc
(E
);
9423 -- Generate message, with useful additional warning if in generic
9425 if Is_Generic_Unit
(E
) then
9426 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
9427 Error_Msg_N
("\& conflicts with declaration#", S
);
9429 Error_Msg_N
("& conflicts with declaration#", S
);
9435 -- E exists and is overloadable
9438 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9440 -- Loop through E and its homonyms to determine if any of them is
9441 -- the candidate for overriding by S.
9443 while Present
(E
) loop
9445 -- Definitely not interesting if not in the current scope
9447 if Scope
(E
) /= Current_Scope
then
9450 -- A function can overload the name of an abstract state. The
9451 -- state can be viewed as a function with a profile that cannot
9452 -- be matched by anything.
9454 elsif Ekind
(S
) = E_Function
9455 and then Ekind
(E
) = E_Abstract_State
9457 Enter_Overloaded_Entity
(S
);
9460 -- Ada 2012 (AI05-0165): For internally generated bodies of null
9461 -- procedures locate the internally generated spec. We enforce
9462 -- mode conformance since a tagged type may inherit from
9463 -- interfaces several null primitives which differ only in
9464 -- the mode of the formals.
9466 elsif not Comes_From_Source
(S
)
9467 and then Is_Null_Procedure
(S
)
9468 and then not Mode_Conformant
(E
, S
)
9472 -- Check if we have type conformance
9474 elsif Type_Conformant
(E
, S
) then
9476 -- If the old and new entities have the same profile and one
9477 -- is not the body of the other, then this is an error, unless
9478 -- one of them is implicitly declared.
9480 -- There are some cases when both can be implicit, for example
9481 -- when both a literal and a function that overrides it are
9482 -- inherited in a derivation, or when an inherited operation
9483 -- of a tagged full type overrides the inherited operation of
9484 -- a private extension. Ada 83 had a special rule for the
9485 -- literal case. In Ada 95, the later implicit operation hides
9486 -- the former, and the literal is always the former. In the
9487 -- odd case where both are derived operations declared at the
9488 -- same point, both operations should be declared, and in that
9489 -- case we bypass the following test and proceed to the next
9490 -- part. This can only occur for certain obscure cases in
9491 -- instances, when an operation on a type derived from a formal
9492 -- private type does not override a homograph inherited from
9493 -- the actual. In subsequent derivations of such a type, the
9494 -- DT positions of these operations remain distinct, if they
9497 if Present
(Alias
(S
))
9498 and then (No
(Alias
(E
))
9499 or else Comes_From_Source
(E
)
9500 or else Is_Abstract_Subprogram
(S
)
9502 (Is_Dispatching_Operation
(E
)
9503 and then Is_Overriding_Alias
(E
, S
)))
9504 and then Ekind
(E
) /= E_Enumeration_Literal
9506 -- When an derived operation is overloaded it may be due to
9507 -- the fact that the full view of a private extension
9508 -- re-inherits. It has to be dealt with.
9510 if Is_Package_Or_Generic_Package
(Current_Scope
)
9511 and then In_Private_Part
(Current_Scope
)
9513 Check_Operation_From_Private_View
(S
, E
);
9516 -- In any case the implicit operation remains hidden by the
9517 -- existing declaration, which is overriding. Indicate that
9518 -- E overrides the operation from which S is inherited.
9520 if Present
(Alias
(S
)) then
9521 Set_Overridden_Operation
(E
, Alias
(S
));
9522 Inherit_Subprogram_Contract
(E
, Alias
(S
));
9525 Set_Overridden_Operation
(E
, S
);
9526 Inherit_Subprogram_Contract
(E
, S
);
9529 if Comes_From_Source
(E
) then
9530 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
9535 -- Within an instance, the renaming declarations for actual
9536 -- subprograms may become ambiguous, but they do not hide each
9539 elsif Ekind
(E
) /= E_Entry
9540 and then not Comes_From_Source
(E
)
9541 and then not Is_Generic_Instance
(E
)
9542 and then (Present
(Alias
(E
))
9543 or else Is_Intrinsic_Subprogram
(E
))
9544 and then (not In_Instance
9545 or else No
(Parent
(E
))
9546 or else Nkind
(Unit_Declaration_Node
(E
)) /=
9547 N_Subprogram_Renaming_Declaration
)
9549 -- A subprogram child unit is not allowed to override an
9550 -- inherited subprogram (10.1.1(20)).
9552 if Is_Child_Unit
(S
) then
9554 ("child unit overrides inherited subprogram in parent",
9559 if Is_Non_Overriding_Operation
(E
, S
) then
9560 Enter_Overloaded_Entity
(S
);
9562 if No
(Derived_Type
)
9563 or else Is_Tagged_Type
(Derived_Type
)
9565 Check_Dispatching_Operation
(S
, Empty
);
9571 -- E is a derived operation or an internal operator which
9572 -- is being overridden. Remove E from further visibility.
9573 -- Furthermore, if E is a dispatching operation, it must be
9574 -- replaced in the list of primitive operations of its type
9575 -- (see Override_Dispatching_Operation).
9577 Overridden_Subp
:= E
;
9583 Prev
:= First_Entity
(Current_Scope
);
9584 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
9588 -- It is possible for E to be in the current scope and
9589 -- yet not in the entity chain. This can only occur in a
9590 -- generic context where E is an implicit concatenation
9591 -- in the formal part, because in a generic body the
9592 -- entity chain starts with the formals.
9594 -- In GNATprove mode, a wrapper for an operation with
9595 -- axiomatization may be a homonym of another declaration
9596 -- for an actual subprogram (needs refinement ???).
9600 and then GNATprove_Mode
9602 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
9603 N_Subprogram_Renaming_Declaration
9607 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
9612 -- E must be removed both from the entity_list of the
9613 -- current scope, and from the visibility chain.
9615 if Debug_Flag_E
then
9616 Write_Str
("Override implicit operation ");
9617 Write_Int
(Int
(E
));
9621 -- If E is a predefined concatenation, it stands for four
9622 -- different operations. As a result, a single explicit
9623 -- declaration does not hide it. In a possible ambiguous
9624 -- situation, Disambiguate chooses the user-defined op,
9625 -- so it is correct to retain the previous internal one.
9627 if Chars
(E
) /= Name_Op_Concat
9628 or else Ekind
(E
) /= E_Operator
9630 -- For nondispatching derived operations that are
9631 -- overridden by a subprogram declared in the private
9632 -- part of a package, we retain the derived subprogram
9633 -- but mark it as not immediately visible. If the
9634 -- derived operation was declared in the visible part
9635 -- then this ensures that it will still be visible
9636 -- outside the package with the proper signature
9637 -- (calls from outside must also be directed to this
9638 -- version rather than the overriding one, unlike the
9639 -- dispatching case). Calls from inside the package
9640 -- will still resolve to the overriding subprogram
9641 -- since the derived one is marked as not visible
9642 -- within the package.
9644 -- If the private operation is dispatching, we achieve
9645 -- the overriding by keeping the implicit operation
9646 -- but setting its alias to be the overriding one. In
9647 -- this fashion the proper body is executed in all
9648 -- cases, but the original signature is used outside
9651 -- If the overriding is not in the private part, we
9652 -- remove the implicit operation altogether.
9654 if Is_Private_Declaration
(S
) then
9655 if not Is_Dispatching_Operation
(E
) then
9656 Set_Is_Immediately_Visible
(E
, False);
9658 -- Work done in Override_Dispatching_Operation,
9659 -- so nothing else needs to be done here.
9665 -- Find predecessor of E in Homonym chain
9667 if E
= Current_Entity
(E
) then
9670 Prev_Vis
:= Current_Entity
(E
);
9671 while Homonym
(Prev_Vis
) /= E
loop
9672 Prev_Vis
:= Homonym
(Prev_Vis
);
9676 if Prev_Vis
/= Empty
then
9678 -- Skip E in the visibility chain
9680 Set_Homonym
(Prev_Vis
, Homonym
(E
));
9683 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
9686 Set_Next_Entity
(Prev
, Next_Entity
(E
));
9688 if No
(Next_Entity
(Prev
)) then
9689 Set_Last_Entity
(Current_Scope
, Prev
);
9694 Enter_Overloaded_Entity
(S
);
9696 -- For entities generated by Derive_Subprograms the
9697 -- overridden operation is the inherited primitive
9698 -- (which is available through the attribute alias).
9700 if not (Comes_From_Source
(E
))
9701 and then Is_Dispatching_Operation
(E
)
9702 and then Find_Dispatching_Type
(E
) =
9703 Find_Dispatching_Type
(S
)
9704 and then Present
(Alias
(E
))
9705 and then Comes_From_Source
(Alias
(E
))
9707 Set_Overridden_Operation
(S
, Alias
(E
));
9708 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9710 -- Normal case of setting entity as overridden
9712 -- Note: Static_Initialization and Overridden_Operation
9713 -- attributes use the same field in subprogram entities.
9714 -- Static_Initialization is only defined for internal
9715 -- initialization procedures, where Overridden_Operation
9716 -- is irrelevant. Therefore the setting of this attribute
9717 -- must check whether the target is an init_proc.
9719 elsif not Is_Init_Proc
(S
) then
9720 Set_Overridden_Operation
(S
, E
);
9721 Inherit_Subprogram_Contract
(S
, E
);
9724 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
9726 -- If S is a user-defined subprogram or a null procedure
9727 -- expanded to override an inherited null procedure, or a
9728 -- predefined dispatching primitive then indicate that E
9729 -- overrides the operation from which S is inherited.
9731 if Comes_From_Source
(S
)
9733 (Present
(Parent
(S
))
9735 Nkind
(Parent
(S
)) = N_Procedure_Specification
9737 Null_Present
(Parent
(S
)))
9739 (Present
(Alias
(E
))
9741 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
9743 if Present
(Alias
(E
)) then
9744 Set_Overridden_Operation
(S
, Alias
(E
));
9745 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9749 if Is_Dispatching_Operation
(E
) then
9751 -- An overriding dispatching subprogram inherits the
9752 -- convention of the overridden subprogram (AI-117).
9754 Set_Convention
(S
, Convention
(E
));
9755 Check_Dispatching_Operation
(S
, E
);
9758 Check_Dispatching_Operation
(S
, Empty
);
9761 Check_For_Primitive_Subprogram
9762 (Is_Primitive_Subp
, Is_Overriding
=> True);
9763 goto Check_Inequality
;
9766 -- Apparent redeclarations in instances can occur when two
9767 -- formal types get the same actual type. The subprograms in
9768 -- in the instance are legal, even if not callable from the
9769 -- outside. Calls from within are disambiguated elsewhere.
9770 -- For dispatching operations in the visible part, the usual
9771 -- rules apply, and operations with the same profile are not
9774 elsif (In_Instance_Visible_Part
9775 and then not Is_Dispatching_Operation
(E
))
9776 or else In_Instance_Not_Visible
9780 -- Here we have a real error (identical profile)
9783 Error_Msg_Sloc
:= Sloc
(E
);
9785 -- Avoid cascaded errors if the entity appears in
9786 -- subsequent calls.
9788 Set_Scope
(S
, Current_Scope
);
9790 -- Generate error, with extra useful warning for the case
9791 -- of a generic instance with no completion.
9793 if Is_Generic_Instance
(S
)
9794 and then not Has_Completion
(E
)
9797 ("instantiation cannot provide body for&", S
);
9798 Error_Msg_N
("\& conflicts with declaration#", S
);
9800 Error_Msg_N
("& conflicts with declaration#", S
);
9807 -- If one subprogram has an access parameter and the other
9808 -- a parameter of an access type, calls to either might be
9809 -- ambiguous. Verify that parameters match except for the
9810 -- access parameter.
9812 if May_Hide_Profile
then
9818 F1
:= First_Formal
(S
);
9819 F2
:= First_Formal
(E
);
9820 while Present
(F1
) and then Present
(F2
) loop
9821 if Is_Access_Type
(Etype
(F1
)) then
9822 if not Is_Access_Type
(Etype
(F2
))
9823 or else not Conforming_Types
9824 (Designated_Type
(Etype
(F1
)),
9825 Designated_Type
(Etype
(F2
)),
9828 May_Hide_Profile
:= False;
9832 not Conforming_Types
9833 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
9835 May_Hide_Profile
:= False;
9846 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
9855 -- On exit, we know that S is a new entity
9857 Enter_Overloaded_Entity
(S
);
9858 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9859 Check_Overriding_Indicator
9860 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9862 -- Overloading is not allowed in SPARK, except for operators
9864 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
9865 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
9866 Check_SPARK_05_Restriction
9867 ("overloading not allowed with entity#", S
);
9870 -- If S is a derived operation for an untagged type then by
9871 -- definition it's not a dispatching operation (even if the parent
9872 -- operation was dispatching), so Check_Dispatching_Operation is not
9873 -- called in that case.
9875 if No
(Derived_Type
)
9876 or else Is_Tagged_Type
(Derived_Type
)
9878 Check_Dispatching_Operation
(S
, Empty
);
9882 -- If this is a user-defined equality operator that is not a derived
9883 -- subprogram, create the corresponding inequality. If the operation is
9884 -- dispatching, the expansion is done elsewhere, and we do not create
9885 -- an explicit inequality operation.
9887 <<Check_Inequality
>>
9888 if Chars
(S
) = Name_Op_Eq
9889 and then Etype
(S
) = Standard_Boolean
9890 and then Present
(Parent
(S
))
9891 and then not Is_Dispatching_Operation
(S
)
9893 Make_Inequality_Operator
(S
);
9894 Check_Untagged_Equality
(S
);
9896 end New_Overloaded_Entity
;
9898 ---------------------
9899 -- Process_Formals --
9900 ---------------------
9902 procedure Process_Formals
9904 Related_Nod
: Node_Id
)
9906 Context
: constant Node_Id
:= Parent
(Parent
(T
));
9907 Param_Spec
: Node_Id
;
9909 Formal_Type
: Entity_Id
;
9913 Num_Out_Params
: Nat
:= 0;
9914 First_Out_Param
: Entity_Id
:= Empty
;
9915 -- Used for setting Is_Only_Out_Parameter
9917 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
9918 -- Determine whether an access type designates a type coming from a
9921 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
9922 -- Check whether the default has a class-wide type. After analysis the
9923 -- default has the type of the formal, so we must also check explicitly
9924 -- for an access attribute.
9926 ----------------------------------
9927 -- Designates_From_Limited_With --
9928 ----------------------------------
9930 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
9931 Desig
: Entity_Id
:= Typ
;
9934 if Is_Access_Type
(Desig
) then
9935 Desig
:= Directly_Designated_Type
(Desig
);
9938 if Is_Class_Wide_Type
(Desig
) then
9939 Desig
:= Root_Type
(Desig
);
9943 Ekind
(Desig
) = E_Incomplete_Type
9944 and then From_Limited_With
(Desig
);
9945 end Designates_From_Limited_With
;
9947 ---------------------------
9948 -- Is_Class_Wide_Default --
9949 ---------------------------
9951 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
9953 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
9954 or else (Nkind
(D
) = N_Attribute_Reference
9955 and then Attribute_Name
(D
) = Name_Access
9956 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
9957 end Is_Class_Wide_Default
;
9959 -- Start of processing for Process_Formals
9962 -- In order to prevent premature use of the formals in the same formal
9963 -- part, the Ekind is left undefined until all default expressions are
9964 -- analyzed. The Ekind is established in a separate loop at the end.
9966 Param_Spec
:= First
(T
);
9967 while Present
(Param_Spec
) loop
9968 Formal
:= Defining_Identifier
(Param_Spec
);
9969 Set_Never_Set_In_Source
(Formal
, True);
9970 Enter_Name
(Formal
);
9972 -- Case of ordinary parameters
9974 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
9975 Find_Type
(Parameter_Type
(Param_Spec
));
9976 Ptype
:= Parameter_Type
(Param_Spec
);
9978 if Ptype
= Error
then
9982 Formal_Type
:= Entity
(Ptype
);
9984 if Is_Incomplete_Type
(Formal_Type
)
9986 (Is_Class_Wide_Type
(Formal_Type
)
9987 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
9989 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
9990 -- primitive operations, as long as their completion is
9991 -- in the same declarative part. If in the private part
9992 -- this means that the type cannot be a Taft-amendment type.
9993 -- Check is done on package exit. For access to subprograms,
9994 -- the use is legal for Taft-amendment types.
9996 -- Ada 2012: tagged incomplete types are allowed as generic
9997 -- formal types. They do not introduce dependencies and the
9998 -- corresponding generic subprogram does not have a delayed
9999 -- freeze, because it does not need a freeze node. However,
10000 -- it is still the case that untagged incomplete types cannot
10001 -- be Taft-amendment types and must be completed in private
10002 -- part, so the subprogram must appear in the list of private
10003 -- dependents of the type. If the type is class-wide, it is
10004 -- not a primitive, but the freezing of the subprogram must
10005 -- also be delayed to force the creation of a freeze node.
10007 if Is_Tagged_Type
(Formal_Type
)
10008 or else (Ada_Version
>= Ada_2012
10009 and then not From_Limited_With
(Formal_Type
)
10010 and then not Is_Generic_Type
(Formal_Type
))
10012 if Ekind
(Scope
(Current_Scope
)) = E_Package
10013 and then not Is_Generic_Type
(Formal_Type
)
10016 (Parent
(T
), N_Access_Function_Definition
,
10017 N_Access_Procedure_Definition
)
10019 if not Is_Class_Wide_Type
(Formal_Type
) then
10020 Append_Elmt
(Current_Scope
,
10021 Private_Dependents
(Base_Type
(Formal_Type
)));
10024 -- Freezing is delayed to ensure that Register_Prim
10025 -- will get called for this operation, which is needed
10026 -- in cases where static dispatch tables aren't built.
10027 -- (Note that the same is done for controlling access
10028 -- parameter cases in function Access_Definition.)
10030 if not Is_Thunk
(Current_Scope
) then
10031 Set_Has_Delayed_Freeze
(Current_Scope
);
10036 -- Special handling of Value_Type for CIL case
10038 elsif Is_Value_Type
(Formal_Type
) then
10041 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
10042 N_Access_Procedure_Definition
)
10044 -- AI05-0151: Tagged incomplete types are allowed in all
10045 -- formal parts. Untagged incomplete types are not allowed
10046 -- in bodies. Limited views of either kind are not allowed
10047 -- if there is no place at which the non-limited view can
10048 -- become available.
10050 -- Incomplete formal untagged types are not allowed in
10051 -- subprogram bodies (but are legal in their declarations).
10052 -- This excludes bodies created for null procedures, which
10053 -- are basic declarations.
10055 if Is_Generic_Type
(Formal_Type
)
10056 and then not Is_Tagged_Type
(Formal_Type
)
10057 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
10060 ("invalid use of formal incomplete type", Param_Spec
);
10062 elsif Ada_Version
>= Ada_2012
then
10063 if Is_Tagged_Type
(Formal_Type
)
10064 and then (not From_Limited_With
(Formal_Type
)
10065 or else not In_Package_Body
)
10069 elsif Nkind_In
(Context
, N_Accept_Statement
,
10070 N_Accept_Alternative
,
10072 or else (Nkind
(Context
) = N_Subprogram_Body
10073 and then Comes_From_Source
(Context
))
10076 ("invalid use of untagged incomplete type &",
10077 Ptype
, Formal_Type
);
10082 ("invalid use of incomplete type&",
10083 Param_Spec
, Formal_Type
);
10085 -- Further checks on the legality of incomplete types
10086 -- in formal parts are delayed until the freeze point
10087 -- of the enclosing subprogram or access to subprogram.
10091 elsif Ekind
(Formal_Type
) = E_Void
then
10093 ("premature use of&",
10094 Parameter_Type
(Param_Spec
), Formal_Type
);
10097 -- Ada 2012 (AI-142): Handle aliased parameters
10099 if Ada_Version
>= Ada_2012
10100 and then Aliased_Present
(Param_Spec
)
10102 Set_Is_Aliased
(Formal
);
10105 -- Ada 2005 (AI-231): Create and decorate an internal subtype
10106 -- declaration corresponding to the null-excluding type of the
10107 -- formal in the enclosing scope. Finally, replace the parameter
10108 -- type of the formal with the internal subtype.
10110 if Ada_Version
>= Ada_2005
10111 and then Null_Exclusion_Present
(Param_Spec
)
10113 if not Is_Access_Type
(Formal_Type
) then
10115 ("`NOT NULL` allowed only for an access type", Param_Spec
);
10118 if Can_Never_Be_Null
(Formal_Type
)
10119 and then Comes_From_Source
(Related_Nod
)
10122 ("`NOT NULL` not allowed (& already excludes null)",
10123 Param_Spec
, Formal_Type
);
10127 Create_Null_Excluding_Itype
10129 Related_Nod
=> Related_Nod
,
10130 Scope_Id
=> Scope
(Current_Scope
));
10132 -- If the designated type of the itype is an itype that is
10133 -- not frozen yet, we set the Has_Delayed_Freeze attribute
10134 -- on the access subtype, to prevent order-of-elaboration
10135 -- issues in the backend.
10138 -- type T is access procedure;
10139 -- procedure Op (O : not null T);
10141 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
10143 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
10145 Set_Has_Delayed_Freeze
(Formal_Type
);
10150 -- An access formal type
10154 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
10156 -- No need to continue if we already notified errors
10158 if not Present
(Formal_Type
) then
10162 -- Ada 2005 (AI-254)
10165 AD
: constant Node_Id
:=
10166 Access_To_Subprogram_Definition
10167 (Parameter_Type
(Param_Spec
));
10169 if Present
(AD
) and then Protected_Present
(AD
) then
10171 Replace_Anonymous_Access_To_Protected_Subprogram
10177 Set_Etype
(Formal
, Formal_Type
);
10179 -- Deal with default expression if present
10181 Default
:= Expression
(Param_Spec
);
10183 if Present
(Default
) then
10184 Check_SPARK_05_Restriction
10185 ("default expression is not allowed", Default
);
10187 if Out_Present
(Param_Spec
) then
10189 ("default initialization only allowed for IN parameters",
10193 -- Do the special preanalysis of the expression (see section on
10194 -- "Handling of Default Expressions" in the spec of package Sem).
10196 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
10198 -- An access to constant cannot be the default for
10199 -- an access parameter that is an access to variable.
10201 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10202 and then not Is_Access_Constant
(Formal_Type
)
10203 and then Is_Access_Type
(Etype
(Default
))
10204 and then Is_Access_Constant
(Etype
(Default
))
10207 ("formal that is access to variable cannot be initialized "
10208 & "with an access-to-constant expression", Default
);
10211 -- Check that the designated type of an access parameter's default
10212 -- is not a class-wide type unless the parameter's designated type
10213 -- is also class-wide.
10215 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10216 and then not Designates_From_Limited_With
(Formal_Type
)
10217 and then Is_Class_Wide_Default
(Default
)
10218 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
10221 ("access to class-wide expression not allowed here", Default
);
10224 -- Check incorrect use of dynamically tagged expressions
10226 if Is_Tagged_Type
(Formal_Type
) then
10227 Check_Dynamically_Tagged_Expression
10229 Typ
=> Formal_Type
,
10230 Related_Nod
=> Default
);
10234 -- Ada 2005 (AI-231): Static checks
10236 if Ada_Version
>= Ada_2005
10237 and then Is_Access_Type
(Etype
(Formal
))
10238 and then Can_Never_Be_Null
(Etype
(Formal
))
10240 Null_Exclusion_Static_Checks
(Param_Spec
);
10243 -- The following checks are relevant when SPARK_Mode is on as these
10244 -- are not standard Ada legality rules.
10246 if SPARK_Mode
= On
then
10247 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
10249 -- A function cannot have a parameter of mode IN OUT or OUT
10252 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
10254 ("function cannot have parameter of mode `OUT` or "
10255 & "`IN OUT`", Formal
);
10257 -- A function cannot have an effectively volatile formal
10258 -- parameter (SPARK RM 7.1.3(10)).
10260 elsif Is_Effectively_Volatile
(Formal
) then
10262 ("function cannot have a volatile formal parameter",
10266 -- A procedure cannot have an effectively volatile formal
10267 -- parameter of mode IN because it behaves as a constant
10268 -- (SPARK RM 7.1.3(6)).
10270 elsif Ekind
(Scope
(Formal
)) = E_Procedure
10271 and then Ekind
(Formal
) = E_In_Parameter
10272 and then Is_Effectively_Volatile
(Formal
)
10275 ("formal parameter of mode `IN` cannot be volatile", Formal
);
10283 -- If this is the formal part of a function specification, analyze the
10284 -- subtype mark in the context where the formals are visible but not
10285 -- yet usable, and may hide outer homographs.
10287 if Nkind
(Related_Nod
) = N_Function_Specification
then
10288 Analyze_Return_Type
(Related_Nod
);
10291 -- Now set the kind (mode) of each formal
10293 Param_Spec
:= First
(T
);
10294 while Present
(Param_Spec
) loop
10295 Formal
:= Defining_Identifier
(Param_Spec
);
10296 Set_Formal_Mode
(Formal
);
10298 if Ekind
(Formal
) = E_In_Parameter
then
10299 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
10301 if Present
(Expression
(Param_Spec
)) then
10302 Default
:= Expression
(Param_Spec
);
10304 if Is_Scalar_Type
(Etype
(Default
)) then
10305 if Nkind
(Parameter_Type
(Param_Spec
)) /=
10306 N_Access_Definition
10308 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
10312 (Related_Nod
, Parameter_Type
(Param_Spec
));
10315 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
10319 elsif Ekind
(Formal
) = E_Out_Parameter
then
10320 Num_Out_Params
:= Num_Out_Params
+ 1;
10322 if Num_Out_Params
= 1 then
10323 First_Out_Param
:= Formal
;
10326 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
10327 Num_Out_Params
:= Num_Out_Params
+ 1;
10330 -- Skip remaining processing if formal type was in error
10332 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
10333 goto Next_Parameter
;
10336 -- Force call by reference if aliased
10338 if Is_Aliased
(Formal
) then
10339 Set_Mechanism
(Formal
, By_Reference
);
10341 -- Warn if user asked this to be passed by copy
10343 if Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10345 ("cannot pass aliased parameter & by copy??", Formal
);
10348 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
10350 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10351 Set_Mechanism
(Formal
, By_Copy
);
10353 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Reference
then
10354 Set_Mechanism
(Formal
, By_Reference
);
10361 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
10362 Set_Is_Only_Out_Parameter
(First_Out_Param
);
10364 end Process_Formals
;
10366 ----------------------------
10367 -- Reference_Body_Formals --
10368 ----------------------------
10370 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
10375 if Error_Posted
(Spec
) then
10379 -- Iterate over both lists. They may be of different lengths if the two
10380 -- specs are not conformant.
10382 Fs
:= First_Formal
(Spec
);
10383 Fb
:= First_Formal
(Bod
);
10384 while Present
(Fs
) and then Present
(Fb
) loop
10385 Generate_Reference
(Fs
, Fb
, 'b');
10387 if Style_Check
then
10388 Style
.Check_Identifier
(Fb
, Fs
);
10391 Set_Spec_Entity
(Fb
, Fs
);
10392 Set_Referenced
(Fs
, False);
10396 end Reference_Body_Formals
;
10398 -------------------------
10399 -- Set_Actual_Subtypes --
10400 -------------------------
10402 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
10404 Formal
: Entity_Id
;
10406 First_Stmt
: Node_Id
:= Empty
;
10407 AS_Needed
: Boolean;
10410 -- If this is an empty initialization procedure, no need to create
10411 -- actual subtypes (small optimization).
10413 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
10417 Formal
:= First_Formal
(Subp
);
10418 while Present
(Formal
) loop
10419 T
:= Etype
(Formal
);
10421 -- We never need an actual subtype for a constrained formal
10423 if Is_Constrained
(T
) then
10424 AS_Needed
:= False;
10426 -- If we have unknown discriminants, then we do not need an actual
10427 -- subtype, or more accurately we cannot figure it out. Note that
10428 -- all class-wide types have unknown discriminants.
10430 elsif Has_Unknown_Discriminants
(T
) then
10431 AS_Needed
:= False;
10433 -- At this stage we have an unconstrained type that may need an
10434 -- actual subtype. For sure the actual subtype is needed if we have
10435 -- an unconstrained array type.
10437 elsif Is_Array_Type
(T
) then
10440 -- The only other case needing an actual subtype is an unconstrained
10441 -- record type which is an IN parameter (we cannot generate actual
10442 -- subtypes for the OUT or IN OUT case, since an assignment can
10443 -- change the discriminant values. However we exclude the case of
10444 -- initialization procedures, since discriminants are handled very
10445 -- specially in this context, see the section entitled "Handling of
10446 -- Discriminants" in Einfo.
10448 -- We also exclude the case of Discrim_SO_Functions (functions used
10449 -- in front end layout mode for size/offset values), since in such
10450 -- functions only discriminants are referenced, and not only are such
10451 -- subtypes not needed, but they cannot always be generated, because
10452 -- of order of elaboration issues.
10454 elsif Is_Record_Type
(T
)
10455 and then Ekind
(Formal
) = E_In_Parameter
10456 and then Chars
(Formal
) /= Name_uInit
10457 and then not Is_Unchecked_Union
(T
)
10458 and then not Is_Discrim_SO_Function
(Subp
)
10462 -- All other cases do not need an actual subtype
10465 AS_Needed
:= False;
10468 -- Generate actual subtypes for unconstrained arrays and
10469 -- unconstrained discriminated records.
10472 if Nkind
(N
) = N_Accept_Statement
then
10474 -- If expansion is active, the formal is replaced by a local
10475 -- variable that renames the corresponding entry of the
10476 -- parameter block, and it is this local variable that may
10477 -- require an actual subtype.
10479 if Expander_Active
then
10480 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
10482 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10485 if Present
(Handled_Statement_Sequence
(N
)) then
10487 First
(Statements
(Handled_Statement_Sequence
(N
)));
10488 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
10489 Mark_Rewrite_Insertion
(Decl
);
10491 -- If the accept statement has no body, there will be no
10492 -- reference to the actuals, so no need to compute actual
10499 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10500 Prepend
(Decl
, Declarations
(N
));
10501 Mark_Rewrite_Insertion
(Decl
);
10504 -- The declaration uses the bounds of an existing object, and
10505 -- therefore needs no constraint checks.
10507 Analyze
(Decl
, Suppress
=> All_Checks
);
10509 -- We need to freeze manually the generated type when it is
10510 -- inserted anywhere else than in a declarative part.
10512 if Present
(First_Stmt
) then
10513 Insert_List_Before_And_Analyze
(First_Stmt
,
10514 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10516 -- Ditto if the type has a dynamic predicate, because the
10517 -- generated function will mention the actual subtype.
10519 elsif Has_Dynamic_Predicate_Aspect
(T
) then
10520 Insert_List_Before_And_Analyze
(Decl
,
10521 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10524 if Nkind
(N
) = N_Accept_Statement
10525 and then Expander_Active
10527 Set_Actual_Subtype
(Renamed_Object
(Formal
),
10528 Defining_Identifier
(Decl
));
10530 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
10534 Next_Formal
(Formal
);
10536 end Set_Actual_Subtypes
;
10538 ---------------------
10539 -- Set_Formal_Mode --
10540 ---------------------
10542 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
10543 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
10546 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
10547 -- since we ensure that corresponding actuals are always valid at the
10548 -- point of the call.
10550 if Out_Present
(Spec
) then
10551 if Ekind_In
(Scope
(Formal_Id
), E_Function
, E_Generic_Function
) then
10553 -- [IN] OUT parameters allowed for functions in Ada 2012
10555 if Ada_Version
>= Ada_2012
then
10557 -- Even in Ada 2012 operators can only have IN parameters
10559 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
10560 Error_Msg_N
("operators can only have IN parameters", Spec
);
10563 if In_Present
(Spec
) then
10564 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10566 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10569 Set_Has_Out_Or_In_Out_Parameter
(Scope
(Formal_Id
), True);
10571 -- But not in earlier versions of Ada
10574 Error_Msg_N
("functions can only have IN parameters", Spec
);
10575 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10578 elsif In_Present
(Spec
) then
10579 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10582 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10583 Set_Never_Set_In_Source
(Formal_Id
, True);
10584 Set_Is_True_Constant
(Formal_Id
, False);
10585 Set_Current_Value
(Formal_Id
, Empty
);
10589 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10592 -- Set Is_Known_Non_Null for access parameters since the language
10593 -- guarantees that access parameters are always non-null. We also set
10594 -- Can_Never_Be_Null, since there is no way to change the value.
10596 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
10598 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
10599 -- null; In Ada 2005, only if then null_exclusion is explicit.
10601 if Ada_Version
< Ada_2005
10602 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
10604 Set_Is_Known_Non_Null
(Formal_Id
);
10605 Set_Can_Never_Be_Null
(Formal_Id
);
10608 -- Ada 2005 (AI-231): Null-exclusion access subtype
10610 elsif Is_Access_Type
(Etype
(Formal_Id
))
10611 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
10613 Set_Is_Known_Non_Null
(Formal_Id
);
10615 -- We can also set Can_Never_Be_Null (thus preventing some junk
10616 -- access checks) for the case of an IN parameter, which cannot
10617 -- be changed, or for an IN OUT parameter, which can be changed but
10618 -- not to a null value. But for an OUT parameter, the initial value
10619 -- passed in can be null, so we can't set this flag in that case.
10621 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
10622 Set_Can_Never_Be_Null
(Formal_Id
);
10626 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
10627 Set_Formal_Validity
(Formal_Id
);
10628 end Set_Formal_Mode
;
10630 -------------------------
10631 -- Set_Formal_Validity --
10632 -------------------------
10634 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
10636 -- If no validity checking, then we cannot assume anything about the
10637 -- validity of parameters, since we do not know there is any checking
10638 -- of the validity on the call side.
10640 if not Validity_Checks_On
then
10643 -- If validity checking for parameters is enabled, this means we are
10644 -- not supposed to make any assumptions about argument values.
10646 elsif Validity_Check_Parameters
then
10649 -- If we are checking in parameters, we will assume that the caller is
10650 -- also checking parameters, so we can assume the parameter is valid.
10652 elsif Ekind
(Formal_Id
) = E_In_Parameter
10653 and then Validity_Check_In_Params
10655 Set_Is_Known_Valid
(Formal_Id
, True);
10657 -- Similar treatment for IN OUT parameters
10659 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
10660 and then Validity_Check_In_Out_Params
10662 Set_Is_Known_Valid
(Formal_Id
, True);
10664 end Set_Formal_Validity
;
10666 ------------------------
10667 -- Subtype_Conformant --
10668 ------------------------
10670 function Subtype_Conformant
10671 (New_Id
: Entity_Id
;
10672 Old_Id
: Entity_Id
;
10673 Skip_Controlling_Formals
: Boolean := False) return Boolean
10677 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
10678 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10680 end Subtype_Conformant
;
10682 ---------------------
10683 -- Type_Conformant --
10684 ---------------------
10686 function Type_Conformant
10687 (New_Id
: Entity_Id
;
10688 Old_Id
: Entity_Id
;
10689 Skip_Controlling_Formals
: Boolean := False) return Boolean
10693 May_Hide_Profile
:= False;
10695 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
10696 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10698 end Type_Conformant
;
10700 -------------------------------
10701 -- Valid_Operator_Definition --
10702 -------------------------------
10704 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
10707 Id
: constant Name_Id
:= Chars
(Designator
);
10711 F
:= First_Formal
(Designator
);
10712 while Present
(F
) loop
10715 if Present
(Default_Value
(F
)) then
10717 ("default values not allowed for operator parameters",
10720 -- For function instantiations that are operators, we must check
10721 -- separately that the corresponding generic only has in-parameters.
10722 -- For subprogram declarations this is done in Set_Formal_Mode. Such
10723 -- an error could not arise in earlier versions of the language.
10725 elsif Ekind
(F
) /= E_In_Parameter
then
10726 Error_Msg_N
("operators can only have IN parameters", F
);
10732 -- Verify that user-defined operators have proper number of arguments
10733 -- First case of operators which can only be unary
10735 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
10738 -- Case of operators which can be unary or binary
10740 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
10741 N_OK
:= (N
in 1 .. 2);
10743 -- All other operators can only be binary
10751 ("incorrect number of arguments for operator", Designator
);
10755 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
10756 and then not Is_Intrinsic_Subprogram
(Designator
)
10759 ("explicit definition of inequality not allowed", Designator
);
10761 end Valid_Operator_Definition
;