1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, 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 Inline
; use Inline
;
44 with Itypes
; use Itypes
;
45 with Lib
.Xref
; use Lib
.Xref
;
46 with Layout
; use Layout
;
47 with Namet
; use Namet
;
49 with Nlists
; use Nlists
;
50 with Nmake
; use Nmake
;
52 with Output
; use Output
;
53 with Restrict
; use Restrict
;
54 with Rident
; use Rident
;
55 with Rtsfind
; use Rtsfind
;
57 with Sem_Aux
; use Sem_Aux
;
58 with Sem_Cat
; use Sem_Cat
;
59 with Sem_Ch3
; use Sem_Ch3
;
60 with Sem_Ch4
; use Sem_Ch4
;
61 with Sem_Ch5
; use Sem_Ch5
;
62 with Sem_Ch8
; use Sem_Ch8
;
63 with Sem_Ch10
; use Sem_Ch10
;
64 with Sem_Ch12
; use Sem_Ch12
;
65 with Sem_Ch13
; use Sem_Ch13
;
66 with Sem_Dim
; use Sem_Dim
;
67 with Sem_Disp
; use Sem_Disp
;
68 with Sem_Dist
; use Sem_Dist
;
69 with Sem_Elim
; use Sem_Elim
;
70 with Sem_Eval
; use Sem_Eval
;
71 with Sem_Mech
; use Sem_Mech
;
72 with Sem_Prag
; use Sem_Prag
;
73 with Sem_Res
; use Sem_Res
;
74 with Sem_Util
; use Sem_Util
;
75 with Sem_Type
; use Sem_Type
;
76 with Sem_Warn
; use Sem_Warn
;
77 with Sinput
; use Sinput
;
78 with Stand
; use Stand
;
79 with Sinfo
; use Sinfo
;
80 with Sinfo
.CN
; use Sinfo
.CN
;
81 with Snames
; use Snames
;
82 with Stringt
; use Stringt
;
84 with Stylesw
; use Stylesw
;
85 with Targparm
; use Targparm
;
86 with Tbuild
; use Tbuild
;
87 with Uintp
; use Uintp
;
88 with Urealp
; use Urealp
;
89 with Validsw
; use Validsw
;
91 package body Sem_Ch6
is
93 May_Hide_Profile
: Boolean := False;
94 -- This flag is used to indicate that two formals in two subprograms being
95 -- checked for conformance differ only in that one is an access parameter
96 -- while the other is of a general access type with the same designated
97 -- type. In this case, if the rest of the signatures match, a call to
98 -- either subprogram may be ambiguous, which is worth a warning. The flag
99 -- is set in Compatible_Types, and the warning emitted in
100 -- New_Overloaded_Entity.
102 -----------------------
103 -- Local Subprograms --
104 -----------------------
106 procedure Analyze_Null_Procedure
108 Is_Completion
: out Boolean);
109 -- A null procedure can be a declaration or (Ada 2012) a completion
111 procedure Analyze_Return_Statement
(N
: Node_Id
);
112 -- Common processing for simple and extended return statements
114 procedure Analyze_Function_Return
(N
: Node_Id
);
115 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
116 -- applies to a [generic] function.
118 procedure Analyze_Return_Type
(N
: Node_Id
);
119 -- Subsidiary to Process_Formals: analyze subtype mark in function
120 -- specification in a context where the formals are visible and hide
123 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
124 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
125 -- that we can use RETURN but not skip the debug output at the end.
127 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
128 -- Analyze a generic subprogram body. N is the body to be analyzed, and
129 -- Gen_Id is the defining entity Id for the corresponding spec.
131 function Can_Override_Operator
(Subp
: Entity_Id
) return Boolean;
132 -- Returns true if Subp can override a predefined operator.
134 procedure Check_Conformance
137 Ctype
: Conformance_Type
;
139 Conforms
: out Boolean;
140 Err_Loc
: Node_Id
:= Empty
;
141 Get_Inst
: Boolean := False;
142 Skip_Controlling_Formals
: Boolean := False);
143 -- Given two entities, this procedure checks that the profiles associated
144 -- with these entities meet the conformance criterion given by the third
145 -- parameter. If they conform, Conforms is set True and control returns
146 -- to the caller. If they do not conform, Conforms is set to False, and
147 -- in addition, if Errmsg is True on the call, proper messages are output
148 -- to complain about the conformance failure. If Err_Loc is non_Empty
149 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
150 -- error messages are placed on the appropriate part of the construct
151 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
152 -- against a formal access-to-subprogram type so Get_Instance_Of must
155 procedure Check_Subprogram_Order
(N
: Node_Id
);
156 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
157 -- the alpha ordering rule for N if this ordering requirement applicable.
159 procedure Check_Returns
163 Proc
: Entity_Id
:= Empty
);
164 -- Called to check for missing return statements in a function body, or for
165 -- returns present in a procedure body which has No_Return set. HSS is the
166 -- handled statement sequence for the subprogram body. This procedure
167 -- checks all flow paths to make sure they either have return (Mode = 'F',
168 -- used for functions) or do not have a return (Mode = 'P', used for
169 -- No_Return procedures). The flag Err is set if there are any control
170 -- paths not explicitly terminated by a return in the function case, and is
171 -- True otherwise. Proc is the entity for the procedure case and is used
172 -- in posting the warning message.
174 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
175 -- In Ada 2012, a primitive equality operator on an untagged record type
176 -- must appear before the type is frozen, and have the same visibility as
177 -- that of the type. This procedure checks that this rule is met, and
178 -- otherwise emits an error on the subprogram declaration and a warning
179 -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode,
180 -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier
181 -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility
182 -- is set, otherwise the call has no effect.
184 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
185 -- This procedure makes S, a new overloaded entity, into the first visible
186 -- entity with that name.
188 function Is_Non_Overriding_Operation
190 New_E
: Entity_Id
) return Boolean;
191 -- Enforce the rule given in 12.3(18): a private operation in an instance
192 -- overrides an inherited operation only if the corresponding operation
193 -- was overriding in the generic. This needs to be checked for primitive
194 -- operations of types derived (in the generic unit) from formal private
195 -- or formal derived types.
197 procedure Make_Inequality_Operator
(S
: Entity_Id
);
198 -- Create the declaration for an inequality operator that is implicitly
199 -- created by a user-defined equality operator that yields a boolean.
201 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
202 -- Formal_Id is an formal parameter entity. This procedure deals with
203 -- setting the proper validity status for this entity, which depends on
204 -- the kind of parameter and the validity checking mode.
206 ---------------------------------------------
207 -- Analyze_Abstract_Subprogram_Declaration --
208 ---------------------------------------------
210 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
211 Designator
: constant Entity_Id
:=
212 Analyze_Subprogram_Specification
(Specification
(N
));
213 Scop
: constant Entity_Id
:= Current_Scope
;
216 Check_SPARK_05_Restriction
("abstract subprogram is not allowed", N
);
218 Generate_Definition
(Designator
);
219 Set_Contract
(Designator
, Make_Contract
(Sloc
(Designator
)));
220 Set_Is_Abstract_Subprogram
(Designator
);
221 New_Overloaded_Entity
(Designator
);
222 Check_Delayed_Subprogram
(Designator
);
224 Set_Categorization_From_Scope
(Designator
, Scop
);
226 -- An abstract subprogram declared within a Ghost scope is automatically
227 -- Ghost (SPARK RM 6.9(2)).
229 if Comes_From_Source
(Designator
) and then Within_Ghost_Scope
then
230 Set_Is_Ghost_Entity
(Designator
);
233 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
235 ("abstract subprogram not allowed in protected type", N
);
237 -- Issue a warning if the abstract subprogram is neither a dispatching
238 -- operation nor an operation that overrides an inherited subprogram or
239 -- predefined operator, since this most likely indicates a mistake.
241 elsif Warn_On_Redundant_Constructs
242 and then not Is_Dispatching_Operation
(Designator
)
243 and then not Present
(Overridden_Operation
(Designator
))
244 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
245 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
248 ("abstract subprogram is not dispatching or overriding?r?", N
);
251 Generate_Reference_To_Formals
(Designator
);
252 Check_Eliminated
(Designator
);
254 if Has_Aspects
(N
) then
255 Analyze_Aspect_Specifications
(N
, Designator
);
257 end Analyze_Abstract_Subprogram_Declaration
;
259 ---------------------------------
260 -- Analyze_Expression_Function --
261 ---------------------------------
263 procedure Analyze_Expression_Function
(N
: Node_Id
) is
264 Loc
: constant Source_Ptr
:= Sloc
(N
);
265 LocX
: constant Source_Ptr
:= Sloc
(Expression
(N
));
266 Expr
: constant Node_Id
:= Expression
(N
);
267 Spec
: constant Node_Id
:= Specification
(N
);
272 -- If the expression is a completion, Prev is the entity whose
273 -- declaration is completed. Def_Id is needed to analyze the spec.
280 -- This is one of the occasions on which we transform the tree during
281 -- semantic analysis. If this is a completion, transform the expression
282 -- function into an equivalent subprogram body, and analyze it.
284 -- Expression functions are inlined unconditionally. The back-end will
285 -- determine whether this is possible.
287 Inline_Processing_Required
:= True;
289 -- Create a specification for the generated body. Types and defauts in
290 -- the profile are copies of the spec, but new entities must be created
291 -- for the unit name and the formals.
293 New_Spec
:= New_Copy_Tree
(Spec
);
294 Set_Defining_Unit_Name
(New_Spec
,
295 Make_Defining_Identifier
(Sloc
(Defining_Unit_Name
(Spec
)),
296 Chars
(Defining_Unit_Name
(Spec
))));
298 if Present
(Parameter_Specifications
(New_Spec
)) then
300 Formal_Spec
: Node_Id
;
304 Formal_Spec
:= First
(Parameter_Specifications
(New_Spec
));
306 -- Create a new formal parameter at the same source position
308 while Present
(Formal_Spec
) loop
309 Def
:= Defining_Identifier
(Formal_Spec
);
310 Set_Defining_Identifier
(Formal_Spec
,
311 Make_Defining_Identifier
(Sloc
(Def
),
312 Chars
=> Chars
(Def
)));
318 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
320 -- If there are previous overloadable entities with the same name,
321 -- check whether any of them is completed by the expression function.
322 -- In a generic context a formal subprogram has no completion.
324 if Present
(Prev
) and then Is_Overloadable
(Prev
)
325 and then not Is_Formal_Subprogram
(Prev
)
327 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
328 Prev
:= Find_Corresponding_Spec
(N
);
330 -- The previous entity may be an expression function as well, in
331 -- which case the redeclaration is illegal.
334 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
335 N_Expression_Function
337 Error_Msg_Sloc
:= Sloc
(Prev
);
338 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
343 Ret
:= Make_Simple_Return_Statement
(LocX
, Expression
(N
));
346 Make_Subprogram_Body
(Loc
,
347 Specification
=> New_Spec
,
348 Declarations
=> Empty_List
,
349 Handled_Statement_Sequence
=>
350 Make_Handled_Sequence_Of_Statements
(LocX
,
351 Statements
=> New_List
(Ret
)));
353 -- If the expression completes a generic subprogram, we must create a
354 -- separate node for the body, because at instantiation the original
355 -- node of the generic copy must be a generic subprogram body, and
356 -- cannot be a expression function. Otherwise we just rewrite the
357 -- expression with the non-generic body.
359 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
360 Insert_After
(N
, New_Body
);
362 -- Propagate any aspects or pragmas that apply to the expression
363 -- function to the proper body when the expression function acts
366 if Has_Aspects
(N
) then
367 Move_Aspects
(N
, To
=> New_Body
);
370 Relocate_Pragmas_To_Body
(New_Body
);
372 Rewrite
(N
, Make_Null_Statement
(Loc
));
373 Set_Has_Completion
(Prev
, False);
376 Set_Is_Inlined
(Prev
);
378 -- If the expression function is a completion, the previous declaration
379 -- must come from source. We know already that appears in the current
380 -- scope. The entity itself may be internally created if within a body
383 elsif Present
(Prev
) and then Comes_From_Source
(Parent
(Prev
))
384 and then not Is_Formal_Subprogram
(Prev
)
386 Set_Has_Completion
(Prev
, False);
388 -- An expression function that is a completion freezes the
389 -- expression. This means freezing the return type, and if it is
390 -- an access type, freezing its designated type as well.
392 -- Note that we cannot defer this freezing to the analysis of the
393 -- expression itself, because a freeze node might appear in a nested
394 -- scope, leading to an elaboration order issue in gigi.
396 Freeze_Before
(N
, Etype
(Prev
));
398 if Is_Access_Type
(Etype
(Prev
)) then
399 Freeze_Before
(N
, Designated_Type
(Etype
(Prev
)));
402 -- For navigation purposes, indicate that the function is a body
404 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
405 Rewrite
(N
, New_Body
);
407 -- Correct the parent pointer of the aspect specification list to
408 -- reference the rewritten node.
410 if Has_Aspects
(N
) then
411 Set_Parent
(Aspect_Specifications
(N
), N
);
414 -- Propagate any pragmas that apply to the expression function to the
415 -- proper body when the expression function acts as a completion.
416 -- Aspects are automatically transfered because of node rewriting.
418 Relocate_Pragmas_To_Body
(N
);
421 -- Prev is the previous entity with the same name, but it is can
422 -- be an unrelated spec that is not completed by the expression
423 -- function. In that case the relevant entity is the one in the body.
424 -- Not clear that the backend can inline it in this case ???
426 if Has_Completion
(Prev
) then
427 Set_Is_Inlined
(Prev
);
429 -- The formals of the expression function are body formals,
430 -- and do not appear in the ali file, which will only contain
431 -- references to the formals of the original subprogram spec.
438 F1
:= First_Formal
(Def_Id
);
439 F2
:= First_Formal
(Prev
);
441 while Present
(F1
) loop
442 Set_Spec_Entity
(F1
, F2
);
449 Set_Is_Inlined
(Defining_Entity
(New_Body
));
452 -- If this is not a completion, create both a declaration and a body, so
453 -- that the expression can be inlined whenever possible.
456 -- An expression function that is not a completion is not a
457 -- subprogram declaration, and thus cannot appear in a protected
460 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
462 ("an expression function is not a legal protected operation", N
);
465 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
467 -- Correct the parent pointer of the aspect specification list to
468 -- reference the rewritten node.
470 if Has_Aspects
(N
) then
471 Set_Parent
(Aspect_Specifications
(N
), N
);
476 -- Within a generic pre-analyze the original expression for name
477 -- capture. The body is also generated but plays no role in
478 -- this because it is not part of the original source.
480 if Inside_A_Generic
then
482 Id
: constant Entity_Id
:= Defining_Entity
(N
);
485 Set_Has_Completion
(Id
);
487 Install_Formals
(Id
);
488 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
493 Set_Is_Inlined
(Defining_Entity
(N
));
495 -- Establish the linkages between the spec and the body. These are
496 -- used when the expression function acts as the prefix of attribute
497 -- 'Access in order to freeze the original expression which has been
498 -- moved to the generated body.
500 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
501 Set_Corresponding_Spec
(New_Body
, Defining_Entity
(N
));
503 -- To prevent premature freeze action, insert the new body at the end
504 -- of the current declarations, or at the end of the package spec.
505 -- However, resolve usage names now, to prevent spurious visibility
506 -- on later entities. Note that the function can now be called in
507 -- the current declarative part, which will appear to be prior to
508 -- the presence of the body in the code. There are nevertheless no
509 -- order of elaboration issues because all name resolution has taken
510 -- place at the point of declaration.
513 Decls
: List_Id
:= List_Containing
(N
);
514 Par
: constant Node_Id
:= Parent
(Decls
);
515 Id
: constant Entity_Id
:= Defining_Entity
(N
);
518 -- If this is a wrapper created for in an instance for a formal
519 -- subprogram, insert body after declaration, to be analyzed when
520 -- the enclosing instance is analyzed.
523 and then Is_Generic_Actual_Subprogram
(Defining_Entity
(N
))
525 Insert_After
(N
, New_Body
);
528 if Nkind
(Par
) = N_Package_Specification
529 and then Decls
= Visible_Declarations
(Par
)
530 and then Present
(Private_Declarations
(Par
))
531 and then not Is_Empty_List
(Private_Declarations
(Par
))
533 Decls
:= Private_Declarations
(Par
);
536 Insert_After
(Last
(Decls
), New_Body
);
538 Install_Formals
(Id
);
540 -- Preanalyze the expression for name capture, except in an
541 -- instance, where this has been done during generic analysis,
542 -- and will be redone when analyzing the body.
545 Expr
: constant Node_Id
:= Expression
(Ret
);
548 Set_Parent
(Expr
, Ret
);
550 if not In_Instance
then
551 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
560 -- If the return expression is a static constant, we suppress warning
561 -- messages on unused formals, which in most cases will be noise.
563 Set_Is_Trivial_Subprogram
(Defining_Entity
(New_Body
),
564 Is_OK_Static_Expression
(Expr
));
565 end Analyze_Expression_Function
;
567 ----------------------------------------
568 -- Analyze_Extended_Return_Statement --
569 ----------------------------------------
571 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
573 Check_Compiler_Unit
("extended return statement", N
);
574 Analyze_Return_Statement
(N
);
575 end Analyze_Extended_Return_Statement
;
577 ----------------------------
578 -- Analyze_Function_Call --
579 ----------------------------
581 procedure Analyze_Function_Call
(N
: Node_Id
) is
582 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
583 Func_Nam
: constant Node_Id
:= Name
(N
);
589 -- A call of the form A.B (X) may be an Ada 2005 call, which is
590 -- rewritten as B (A, X). If the rewriting is successful, the call
591 -- has been analyzed and we just return.
593 if Nkind
(Func_Nam
) = N_Selected_Component
594 and then Name
(N
) /= Func_Nam
595 and then Is_Rewrite_Substitution
(N
)
596 and then Present
(Etype
(N
))
601 -- If error analyzing name, then set Any_Type as result type and return
603 if Etype
(Func_Nam
) = Any_Type
then
604 Set_Etype
(N
, Any_Type
);
608 -- Otherwise analyze the parameters
610 if Present
(Actuals
) then
611 Actual
:= First
(Actuals
);
612 while Present
(Actual
) loop
614 Check_Parameterless_Call
(Actual
);
620 end Analyze_Function_Call
;
622 -----------------------------
623 -- Analyze_Function_Return --
624 -----------------------------
626 procedure Analyze_Function_Return
(N
: Node_Id
) is
627 Loc
: constant Source_Ptr
:= Sloc
(N
);
628 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
629 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
631 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
632 -- Function result subtype
634 procedure Check_Limited_Return
(Expr
: Node_Id
);
635 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
636 -- limited types. Used only for simple return statements.
637 -- Expr is the expression returned.
639 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
640 -- Check that the return_subtype_indication properly matches the result
641 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
643 --------------------------
644 -- Check_Limited_Return --
645 --------------------------
647 procedure Check_Limited_Return
(Expr
: Node_Id
) is
649 -- Ada 2005 (AI-318-02): Return-by-reference types have been
650 -- removed and replaced by anonymous access results. This is an
651 -- incompatibility with Ada 95. Not clear whether this should be
652 -- enforced yet or perhaps controllable with special switch. ???
654 -- A limited interface that is not immutably limited is OK.
656 if Is_Limited_Interface
(R_Type
)
658 not (Is_Task_Interface
(R_Type
)
659 or else Is_Protected_Interface
(R_Type
)
660 or else Is_Synchronized_Interface
(R_Type
))
664 elsif Is_Limited_Type
(R_Type
)
665 and then not Is_Interface
(R_Type
)
666 and then Comes_From_Source
(N
)
667 and then not In_Instance_Body
668 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
672 if Ada_Version
>= Ada_2005
673 and then not Debug_Flag_Dot_L
674 and then not GNAT_Mode
677 ("(Ada 2005) cannot copy object of a limited type "
678 & "(RM-2005 6.5(5.5/2))", Expr
);
680 if Is_Limited_View
(R_Type
) then
682 ("\return by reference not permitted in Ada 2005", Expr
);
685 -- Warn in Ada 95 mode, to give folks a heads up about this
688 -- In GNAT mode, this is just a warning, to allow it to be
689 -- evilly turned off. Otherwise it is a real error.
691 -- In a generic context, simplify the warning because it makes
692 -- no sense to discuss pass-by-reference or copy.
694 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
695 if Inside_A_Generic
then
697 ("return of limited object not permitted in Ada 2005 "
698 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
700 elsif Is_Limited_View
(R_Type
) then
702 ("return by reference not permitted in Ada 2005 "
703 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
706 ("cannot copy object of a limited type in Ada 2005 "
707 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
710 -- Ada 95 mode, compatibility warnings disabled
713 return; -- skip continuation messages below
716 if not Inside_A_Generic
then
718 ("\consider switching to return of access type", Expr
);
719 Explain_Limited_Type
(R_Type
, Expr
);
722 end Check_Limited_Return
;
724 -------------------------------------
725 -- Check_Return_Subtype_Indication --
726 -------------------------------------
728 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
729 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
731 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
732 -- Subtype given in the extended return statement (must match R_Type)
734 Subtype_Ind
: constant Node_Id
:=
735 Object_Definition
(Original_Node
(Obj_Decl
));
737 R_Type_Is_Anon_Access
: constant Boolean :=
739 E_Anonymous_Access_Subprogram_Type
,
740 E_Anonymous_Access_Protected_Subprogram_Type
,
741 E_Anonymous_Access_Type
);
742 -- True if return type of the function is an anonymous access type
743 -- Can't we make Is_Anonymous_Access_Type in einfo ???
745 R_Stm_Type_Is_Anon_Access
: constant Boolean :=
746 Ekind_In
(R_Stm_Type
,
747 E_Anonymous_Access_Subprogram_Type
,
748 E_Anonymous_Access_Protected_Subprogram_Type
,
749 E_Anonymous_Access_Type
);
750 -- True if type of the return object is an anonymous access type
752 procedure Error_No_Match
(N
: Node_Id
);
753 -- Output error messages for case where types do not statically
754 -- match. N is the location for the messages.
760 procedure Error_No_Match
(N
: Node_Id
) is
763 ("subtype must statically match function result subtype", N
);
765 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
766 Error_Msg_Node_2
:= R_Type
;
768 ("\predicate of& does not match predicate of&",
773 -- Start of processing for Check_Return_Subtype_Indication
776 -- First, avoid cascaded errors
778 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
782 -- "return access T" case; check that the return statement also has
783 -- "access T", and that the subtypes statically match:
784 -- if this is an access to subprogram the signatures must match.
786 if R_Type_Is_Anon_Access
then
787 if R_Stm_Type_Is_Anon_Access
then
789 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
791 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
792 Base_Type
(Designated_Type
(R_Type
))
793 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
795 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
799 -- For two anonymous access to subprogram types, the
800 -- types themselves must be type conformant.
802 if not Conforming_Types
803 (R_Stm_Type
, R_Type
, Fully_Conformant
)
805 Error_No_Match
(Subtype_Ind
);
810 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
813 -- If the return object is of an anonymous access type, then report
814 -- an error if the function's result type is not also anonymous.
816 elsif R_Stm_Type_Is_Anon_Access
817 and then not R_Type_Is_Anon_Access
819 Error_Msg_N
("anonymous access not allowed for function with "
820 & "named access result", Subtype_Ind
);
822 -- Subtype indication case: check that the return object's type is
823 -- covered by the result type, and that the subtypes statically match
824 -- when the result subtype is constrained. Also handle record types
825 -- with unknown discriminants for which we have built the underlying
826 -- record view. Coverage is needed to allow specific-type return
827 -- objects when the result type is class-wide (see AI05-32).
829 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
830 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
834 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
836 -- A null exclusion may be present on the return type, on the
837 -- function specification, on the object declaration or on the
840 if Is_Access_Type
(R_Type
)
842 (Can_Never_Be_Null
(R_Type
)
843 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
844 Can_Never_Be_Null
(R_Stm_Type
)
846 Error_No_Match
(Subtype_Ind
);
849 -- AI05-103: for elementary types, subtypes must statically match
851 if Is_Constrained
(R_Type
)
852 or else Is_Access_Type
(R_Type
)
854 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
855 Error_No_Match
(Subtype_Ind
);
859 -- All remaining cases are illegal
861 -- Note: previous versions of this subprogram allowed the return
862 -- value to be the ancestor of the return type if the return type
863 -- was a null extension. This was plainly incorrect.
867 ("wrong type for return_subtype_indication", Subtype_Ind
);
869 end Check_Return_Subtype_Indication
;
871 ---------------------
872 -- Local Variables --
873 ---------------------
877 -- Start of processing for Analyze_Function_Return
880 Set_Return_Present
(Scope_Id
);
882 if Nkind
(N
) = N_Simple_Return_Statement
then
883 Expr
:= Expression
(N
);
885 -- Guard against a malformed expression. The parser may have tried to
886 -- recover but the node is not analyzable.
888 if Nkind
(Expr
) = N_Error
then
889 Set_Etype
(Expr
, Any_Type
);
890 Expander_Mode_Save_And_Set
(False);
894 -- The resolution of a controlled [extension] aggregate associated
895 -- with a return statement creates a temporary which needs to be
896 -- finalized on function exit. Wrap the return statement inside a
897 -- block so that the finalization machinery can detect this case.
898 -- This early expansion is done only when the return statement is
899 -- not part of a handled sequence of statements.
901 if Nkind_In
(Expr
, N_Aggregate
,
902 N_Extension_Aggregate
)
903 and then Needs_Finalization
(R_Type
)
904 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
907 Make_Block_Statement
(Loc
,
908 Handled_Statement_Sequence
=>
909 Make_Handled_Sequence_Of_Statements
(Loc
,
910 Statements
=> New_List
(Relocate_Node
(N
)))));
918 -- Ada 2005 (AI-251): If the type of the returned object is
919 -- an access to an interface type then we add an implicit type
920 -- conversion to force the displacement of the "this" pointer to
921 -- reference the secondary dispatch table. We cannot delay the
922 -- generation of this implicit conversion until the expansion
923 -- because in this case the type resolution changes the decoration
924 -- of the expression node to match R_Type; by contrast, if the
925 -- returned object is a class-wide interface type then it is too
926 -- early to generate here the implicit conversion since the return
927 -- statement may be rewritten by the expander into an extended
928 -- return statement whose expansion takes care of adding the
929 -- implicit type conversion to displace the pointer to the object.
932 and then Serious_Errors_Detected
= 0
933 and then Is_Access_Type
(R_Type
)
934 and then Nkind
(Expr
) /= N_Null
935 and then Is_Interface
(Designated_Type
(R_Type
))
936 and then Is_Progenitor
(Designated_Type
(R_Type
),
937 Designated_Type
(Etype
(Expr
)))
939 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
943 Resolve
(Expr
, R_Type
);
944 Check_Limited_Return
(Expr
);
947 -- RETURN only allowed in SPARK as the last statement in function
949 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
951 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
952 or else Present
(Next
(N
)))
954 Check_SPARK_05_Restriction
955 ("RETURN should be the last statement in function", N
);
959 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
961 -- Analyze parts specific to extended_return_statement:
964 Obj_Decl
: constant Node_Id
:=
965 Last
(Return_Object_Declarations
(N
));
966 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
967 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
970 Expr
:= Expression
(Obj_Decl
);
972 -- Note: The check for OK_For_Limited_Init will happen in
973 -- Analyze_Object_Declaration; we treat it as a normal
974 -- object declaration.
976 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
979 Check_Return_Subtype_Indication
(Obj_Decl
);
981 if Present
(HSS
) then
984 if Present
(Exception_Handlers
(HSS
)) then
986 -- ???Has_Nested_Block_With_Handler needs to be set.
987 -- Probably by creating an actual N_Block_Statement.
988 -- Probably in Expand.
994 -- Mark the return object as referenced, since the return is an
995 -- implicit reference of the object.
997 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
999 Check_References
(Stm_Entity
);
1001 -- Check RM 6.5 (5.9/3)
1004 if Ada_Version
< Ada_2012
then
1006 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
1007 -- Can it really happen (extended return???)
1010 ("aliased only allowed for limited return objects "
1011 & "in Ada 2012??", N
);
1013 elsif not Is_Limited_View
(R_Type
) then
1015 ("aliased only allowed for limited return objects", N
);
1021 -- Case of Expr present
1025 -- Defend against previous errors
1027 and then Nkind
(Expr
) /= N_Empty
1028 and then Present
(Etype
(Expr
))
1030 -- Apply constraint check. Note that this is done before the implicit
1031 -- conversion of the expression done for anonymous access types to
1032 -- ensure correct generation of the null-excluding check associated
1033 -- with null-excluding expressions found in return statements.
1035 Apply_Constraint_Check
(Expr
, R_Type
);
1037 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1038 -- type, apply an implicit conversion of the expression to that type
1039 -- to force appropriate static and run-time accessibility checks.
1041 if Ada_Version
>= Ada_2005
1042 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1044 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1045 Analyze_And_Resolve
(Expr
, R_Type
);
1047 -- If this is a local anonymous access to subprogram, the
1048 -- accessibility check can be applied statically. The return is
1049 -- illegal if the access type of the return expression is declared
1050 -- inside of the subprogram (except if it is the subtype indication
1051 -- of an extended return statement).
1053 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1054 if not Comes_From_Source
(Current_Scope
)
1055 or else Ekind
(Current_Scope
) = E_Return_Statement
1060 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1062 Error_Msg_N
("cannot return local access to subprogram", N
);
1065 -- The expression cannot be of a formal incomplete type
1067 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1068 and then Is_Generic_Type
(Etype
(Expr
))
1071 ("cannot return expression of a formal incomplete type", N
);
1074 -- If the result type is class-wide, then check that the return
1075 -- expression's type is not declared at a deeper level than the
1076 -- function (RM05-6.5(5.6/2)).
1078 if Ada_Version
>= Ada_2005
1079 and then Is_Class_Wide_Type
(R_Type
)
1081 if Type_Access_Level
(Etype
(Expr
)) >
1082 Subprogram_Access_Level
(Scope_Id
)
1085 ("level of return expression type is deeper than "
1086 & "class-wide function!", Expr
);
1090 -- Check incorrect use of dynamically tagged expression
1092 if Is_Tagged_Type
(R_Type
) then
1093 Check_Dynamically_Tagged_Expression
1099 -- ??? A real run-time accessibility check is needed in cases
1100 -- involving dereferences of access parameters. For now we just
1101 -- check the static cases.
1103 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1104 and then Is_Limited_View
(Etype
(Scope_Id
))
1105 and then Object_Access_Level
(Expr
) >
1106 Subprogram_Access_Level
(Scope_Id
)
1108 -- Suppress the message in a generic, where the rewriting
1111 if Inside_A_Generic
then
1116 Make_Raise_Program_Error
(Loc
,
1117 Reason
=> PE_Accessibility_Check_Failed
));
1120 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1121 Error_Msg_N
("cannot return a local value by reference<<", N
);
1122 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1126 if Known_Null
(Expr
)
1127 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1128 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1130 Apply_Compile_Time_Constraint_Error
1132 Msg
=> "(Ada 2005) null not allowed for "
1133 & "null-excluding return??",
1134 Reason
=> CE_Null_Not_Allowed
);
1137 end Analyze_Function_Return
;
1139 -------------------------------------
1140 -- Analyze_Generic_Subprogram_Body --
1141 -------------------------------------
1143 procedure Analyze_Generic_Subprogram_Body
1147 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1148 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1149 Body_Id
: Entity_Id
;
1154 -- Copy body and disable expansion while analyzing the generic For a
1155 -- stub, do not copy the stub (which would load the proper body), this
1156 -- will be done when the proper body is analyzed.
1158 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1159 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1164 Spec
:= Specification
(N
);
1166 -- Within the body of the generic, the subprogram is callable, and
1167 -- behaves like the corresponding non-generic unit.
1169 Body_Id
:= Defining_Entity
(Spec
);
1171 if Kind
= E_Generic_Procedure
1172 and then Nkind
(Spec
) /= N_Procedure_Specification
1174 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1177 elsif Kind
= E_Generic_Function
1178 and then Nkind
(Spec
) /= N_Function_Specification
1180 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1184 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1186 if Has_Completion
(Gen_Id
)
1187 and then Nkind
(Parent
(N
)) /= N_Subunit
1189 Error_Msg_N
("duplicate generic body", N
);
1192 Set_Has_Completion
(Gen_Id
);
1195 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1196 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1198 Set_Corresponding_Spec
(N
, Gen_Id
);
1201 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1202 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1205 -- Make generic parameters immediately visible in the body. They are
1206 -- needed to process the formals declarations. Then make the formals
1207 -- visible in a separate step.
1209 Push_Scope
(Gen_Id
);
1213 First_Ent
: Entity_Id
;
1216 First_Ent
:= First_Entity
(Gen_Id
);
1219 while Present
(E
) and then not Is_Formal
(E
) loop
1224 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1226 -- Now generic formals are visible, and the specification can be
1227 -- analyzed, for subsequent conformance check.
1229 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1231 -- Make formal parameters visible
1235 -- E is the first formal parameter, we loop through the formals
1236 -- installing them so that they will be visible.
1238 Set_First_Entity
(Gen_Id
, E
);
1239 while Present
(E
) loop
1245 -- Visible generic entity is callable within its own body
1247 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1248 Set_Contract
(Body_Id
, Make_Contract
(Sloc
(Body_Id
)));
1249 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1250 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1251 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1252 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1254 -- Inherit the "ghostness" of the generic spec. Note that this
1255 -- property is not directly inherited as the body may be subject
1256 -- to a different Ghost assertion policy.
1258 if Is_Ghost_Entity
(Gen_Id
) or else Within_Ghost_Scope
then
1259 Set_Is_Ghost_Entity
(Body_Id
);
1261 -- The Ghost policy in effect at the point of declaration and at
1262 -- the point of completion must match (SPARK RM 6.9(15)).
1264 Check_Ghost_Completion
(Gen_Id
, Body_Id
);
1267 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1269 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1271 -- No body to analyze, so restore state of generic unit
1273 Set_Ekind
(Gen_Id
, Kind
);
1274 Set_Ekind
(Body_Id
, Kind
);
1276 if Present
(First_Ent
) then
1277 Set_First_Entity
(Gen_Id
, First_Ent
);
1284 -- If this is a compilation unit, it must be made visible explicitly,
1285 -- because the compilation of the declaration, unlike other library
1286 -- unit declarations, does not. If it is not a unit, the following
1287 -- is redundant but harmless.
1289 Set_Is_Immediately_Visible
(Gen_Id
);
1290 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1292 if Is_Child_Unit
(Gen_Id
) then
1293 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1296 Set_Actual_Subtypes
(N
, Current_Scope
);
1298 -- Deal with [refined] preconditions, postconditions, Contract_Cases,
1299 -- invariants and predicates associated with the body and its spec.
1300 -- Note that this is not pure expansion as Expand_Subprogram_Contract
1301 -- prepares the contract assertions for generic subprograms or for
1302 -- ASIS. Do not generate contract checks in SPARK mode.
1304 if not GNATprove_Mode
then
1305 Expand_Subprogram_Contract
(N
, Gen_Id
, Body_Id
);
1308 -- If the generic unit carries pre- or post-conditions, copy them
1309 -- to the original generic tree, so that they are properly added
1310 -- to any instantiation.
1313 Orig
: constant Node_Id
:= Original_Node
(N
);
1317 Cond
:= First
(Declarations
(N
));
1318 while Present
(Cond
) loop
1319 if Nkind
(Cond
) = N_Pragma
1320 and then Pragma_Name
(Cond
) = Name_Check
1322 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
1324 elsif Nkind
(Cond
) = N_Pragma
1325 and then Pragma_Name
(Cond
) = Name_Postcondition
1327 Set_Ekind
(Defining_Entity
(Orig
), Ekind
(Gen_Id
));
1328 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
1337 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1338 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
1340 Analyze_Declarations
(Declarations
(N
));
1342 Analyze
(Handled_Statement_Sequence
(N
));
1344 Save_Global_References
(Original_Node
(N
));
1346 -- Prior to exiting the scope, include generic formals again (if any
1347 -- are present) in the set of local entities.
1349 if Present
(First_Ent
) then
1350 Set_First_Entity
(Gen_Id
, First_Ent
);
1353 Check_References
(Gen_Id
);
1356 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1358 Check_Subprogram_Order
(N
);
1360 -- Outside of its body, unit is generic again
1362 Set_Ekind
(Gen_Id
, Kind
);
1363 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1366 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1370 end Analyze_Generic_Subprogram_Body
;
1372 ----------------------------
1373 -- Analyze_Null_Procedure --
1374 ----------------------------
1376 procedure Analyze_Null_Procedure
1378 Is_Completion
: out Boolean)
1380 Loc
: constant Source_Ptr
:= Sloc
(N
);
1381 Spec
: constant Node_Id
:= Specification
(N
);
1382 Designator
: Entity_Id
;
1384 Null_Body
: Node_Id
:= Empty
;
1388 -- Capture the profile of the null procedure before analysis, for
1389 -- expansion at the freeze point and at each point of call. The body is
1390 -- used if the procedure has preconditions, or if it is a completion. In
1391 -- the first case the body is analyzed at the freeze point, in the other
1392 -- it replaces the null procedure declaration.
1395 Make_Subprogram_Body
(Loc
,
1396 Specification
=> New_Copy_Tree
(Spec
),
1397 Declarations
=> New_List
,
1398 Handled_Statement_Sequence
=>
1399 Make_Handled_Sequence_Of_Statements
(Loc
,
1400 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
1402 -- Create new entities for body and formals
1404 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1405 Make_Defining_Identifier
1406 (Sloc
(Defining_Entity
(N
)),
1407 Chars
(Defining_Entity
(N
))));
1409 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1410 while Present
(Form
) loop
1411 Set_Defining_Identifier
(Form
,
1412 Make_Defining_Identifier
1413 (Sloc
(Defining_Identifier
(Form
)),
1414 Chars
(Defining_Identifier
(Form
))));
1418 -- Determine whether the null procedure may be a completion of a generic
1419 -- suprogram, in which case we use the new null body as the completion
1420 -- and set minimal semantic information on the original declaration,
1421 -- which is rewritten as a null statement.
1423 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1425 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1426 Insert_Before
(N
, Null_Body
);
1427 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1428 Set_Contract
(Defining_Entity
(N
), Make_Contract
(Loc
));
1430 Rewrite
(N
, Make_Null_Statement
(Loc
));
1431 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1432 Is_Completion
:= True;
1436 -- Resolve the types of the formals now, because the freeze point
1437 -- may appear in a different context, e.g. an instantiation.
1439 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1440 while Present
(Form
) loop
1441 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1442 Find_Type
(Parameter_Type
(Form
));
1445 No
(Access_To_Subprogram_Definition
(Parameter_Type
(Form
)))
1447 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1450 -- The case of a null procedure with a formal that is an
1451 -- access_to_subprogram type, and that is used as an actual
1452 -- in an instantiation is left to the enthusiastic reader.
1461 -- If there are previous overloadable entities with the same name,
1462 -- check whether any of them is completed by the null procedure.
1464 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1465 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1466 Prev
:= Find_Corresponding_Spec
(N
);
1469 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1470 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1471 Set_Has_Completion
(Designator
);
1473 -- Signal to caller that this is a procedure declaration
1475 Is_Completion
:= False;
1477 -- Null procedures are always inlined, but generic formal subprograms
1478 -- which appear as such in the internal instance of formal packages,
1479 -- need no completion and are not marked Inline.
1482 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1484 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1485 Set_Body_To_Inline
(N
, Null_Body
);
1486 Set_Is_Inlined
(Designator
);
1490 -- The null procedure is a completion. We unconditionally rewrite
1491 -- this as a null body (even if expansion is not active), because
1492 -- there are various error checks that are applied on this body
1493 -- when it is analyzed (e.g. correct aspect placement).
1495 if Has_Completion
(Prev
) then
1496 Error_Msg_Sloc
:= Sloc
(Prev
);
1497 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1500 Is_Completion
:= True;
1501 Rewrite
(N
, Null_Body
);
1504 end Analyze_Null_Procedure
;
1506 -----------------------------
1507 -- Analyze_Operator_Symbol --
1508 -----------------------------
1510 -- An operator symbol such as "+" or "and" may appear in context where the
1511 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1512 -- is just a string, as in (conjunction = "or"). In these cases the parser
1513 -- generates this node, and the semantics does the disambiguation. Other
1514 -- such case are actuals in an instantiation, the generic unit in an
1515 -- instantiation, and pragma arguments.
1517 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1518 Par
: constant Node_Id
:= Parent
(N
);
1521 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1522 or else Nkind
(Par
) = N_Function_Instantiation
1523 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1524 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1525 and then not Is_Pragma_String_Literal
(Par
))
1526 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1527 or else (Nkind
(Par
) = N_Attribute_Reference
1528 and then Attribute_Name
(Par
) /= Name_Value
)
1530 Find_Direct_Name
(N
);
1533 Change_Operator_Symbol_To_String_Literal
(N
);
1536 end Analyze_Operator_Symbol
;
1538 -----------------------------------
1539 -- Analyze_Parameter_Association --
1540 -----------------------------------
1542 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1544 Analyze
(Explicit_Actual_Parameter
(N
));
1545 end Analyze_Parameter_Association
;
1547 ----------------------------
1548 -- Analyze_Procedure_Call --
1549 ----------------------------
1551 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1552 Loc
: constant Source_Ptr
:= Sloc
(N
);
1553 P
: constant Node_Id
:= Name
(N
);
1554 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1558 procedure Analyze_Call_And_Resolve
;
1559 -- Do Analyze and Resolve calls for procedure call
1560 -- At end, check illegal order dependence.
1562 ------------------------------
1563 -- Analyze_Call_And_Resolve --
1564 ------------------------------
1566 procedure Analyze_Call_And_Resolve
is
1568 if Nkind
(N
) = N_Procedure_Call_Statement
then
1570 Resolve
(N
, Standard_Void_Type
);
1574 end Analyze_Call_And_Resolve
;
1576 -- Start of processing for Analyze_Procedure_Call
1579 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1580 -- a procedure call or an entry call. The prefix may denote an access
1581 -- to subprogram type, in which case an implicit dereference applies.
1582 -- If the prefix is an indexed component (without implicit dereference)
1583 -- then the construct denotes a call to a member of an entire family.
1584 -- If the prefix is a simple name, it may still denote a call to a
1585 -- parameterless member of an entry family. Resolution of these various
1586 -- interpretations is delicate.
1590 -- If this is a call of the form Obj.Op, the call may have been
1591 -- analyzed and possibly rewritten into a block, in which case
1594 if Analyzed
(N
) then
1598 -- If there is an error analyzing the name (which may have been
1599 -- rewritten if the original call was in prefix notation) then error
1600 -- has been emitted already, mark node and return.
1602 if Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1603 Set_Etype
(N
, Any_Type
);
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 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2082 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2086 ("invalid use of untagged incomplete type&",
2090 -- The type must be completed in the current package. This
2091 -- is checked at the end of the package declaration when
2092 -- Taft-amendment types are identified. If the return type
2093 -- is class-wide, there is no required check, the type can
2094 -- be a bona fide TAT.
2096 if Ekind
(Scope
(Current_Scope
)) = E_Package
2097 and then In_Private_Part
(Scope
(Current_Scope
))
2098 and then not Is_Class_Wide_Type
(Typ
)
2100 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2105 ("invalid use of incomplete type&", Designator
, Typ
);
2110 -- Case where result definition does indicate an error
2113 Set_Etype
(Designator
, Any_Type
);
2115 end Analyze_Return_Type
;
2117 -----------------------------
2118 -- Analyze_Subprogram_Body --
2119 -----------------------------
2121 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2122 Loc
: constant Source_Ptr
:= Sloc
(N
);
2123 Body_Spec
: constant Node_Id
:= Specification
(N
);
2124 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2127 if Debug_Flag_C
then
2128 Write_Str
("==> subprogram body ");
2129 Write_Name
(Chars
(Body_Id
));
2130 Write_Str
(" from ");
2131 Write_Location
(Loc
);
2136 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2138 -- The real work is split out into the helper, so it can do "return;"
2139 -- without skipping the debug output:
2141 Analyze_Subprogram_Body_Helper
(N
);
2143 if Debug_Flag_C
then
2145 Write_Str
("<== subprogram body ");
2146 Write_Name
(Chars
(Body_Id
));
2147 Write_Str
(" from ");
2148 Write_Location
(Loc
);
2151 end Analyze_Subprogram_Body
;
2153 --------------------------------------
2154 -- Analyze_Subprogram_Body_Contract --
2155 --------------------------------------
2157 procedure Analyze_Subprogram_Body_Contract
(Body_Id
: Entity_Id
) is
2158 Body_Decl
: constant Node_Id
:= Parent
(Parent
(Body_Id
));
2159 Mode
: SPARK_Mode_Type
;
2161 Ref_Depends
: Node_Id
:= Empty
;
2162 Ref_Global
: Node_Id
:= Empty
;
2163 Spec_Id
: Entity_Id
;
2166 -- Due to the timing of contract analysis, delayed pragmas may be
2167 -- subject to the wrong SPARK_Mode, usually that of the enclosing
2168 -- context. To remedy this, restore the original SPARK_Mode of the
2169 -- related subprogram body.
2171 Save_SPARK_Mode_And_Set
(Body_Id
, Mode
);
2173 -- When a subprogram body declaration is illegal, its defining entity is
2174 -- left unanalyzed. There is nothing left to do in this case because the
2175 -- body lacks a contract, or even a proper Ekind.
2177 if Ekind
(Body_Id
) = E_Void
then
2181 if Nkind
(Body_Decl
) = N_Subprogram_Body_Stub
then
2182 Spec_Id
:= Corresponding_Spec_Of_Stub
(Body_Decl
);
2184 Spec_Id
:= Corresponding_Spec
(Body_Decl
);
2187 -- Locate and store pragmas Refined_Depends and Refined_Global since
2188 -- their order of analysis matters.
2190 Prag
:= Classifications
(Contract
(Body_Id
));
2191 while Present
(Prag
) loop
2192 if Pragma_Name
(Prag
) = Name_Refined_Depends
then
2193 Ref_Depends
:= Prag
;
2194 elsif Pragma_Name
(Prag
) = Name_Refined_Global
then
2198 Prag
:= Next_Pragma
(Prag
);
2201 -- Analyze Refined_Global first as Refined_Depends may mention items
2202 -- classified in the global refinement.
2204 if Present
(Ref_Global
) then
2205 Analyze_Refined_Global_In_Decl_Part
(Ref_Global
);
2207 -- When the corresponding Global aspect/pragma references a state with
2208 -- visible refinement, the body requires Refined_Global. Refinement is
2209 -- not required when SPARK checks are suppressed.
2211 elsif Present
(Spec_Id
) then
2212 Prag
:= Get_Pragma
(Spec_Id
, Pragma_Global
);
2214 if SPARK_Mode
/= Off
2215 and then Present
(Prag
)
2216 and then Contains_Refined_State
(Prag
)
2219 ("body of subprogram& requires global refinement",
2220 Body_Decl
, Spec_Id
);
2224 -- Refined_Depends must be analyzed after Refined_Global in order to see
2225 -- the modes of all global refinements.
2227 if Present
(Ref_Depends
) then
2228 Analyze_Refined_Depends_In_Decl_Part
(Ref_Depends
);
2230 -- When the corresponding Depends aspect/pragma references a state with
2231 -- visible refinement, the body requires Refined_Depends. Refinement is
2232 -- not required when SPARK checks are suppressed.
2234 elsif Present
(Spec_Id
) then
2235 Prag
:= Get_Pragma
(Spec_Id
, Pragma_Depends
);
2237 if SPARK_Mode
/= Off
2238 and then Present
(Prag
)
2239 and then Contains_Refined_State
(Prag
)
2242 ("body of subprogram& requires dependance refinement",
2243 Body_Decl
, Spec_Id
);
2247 -- Restore the SPARK_Mode of the enclosing context after all delayed
2248 -- pragmas have been analyzed.
2250 Restore_SPARK_Mode
(Mode
);
2251 end Analyze_Subprogram_Body_Contract
;
2253 ------------------------------------
2254 -- Analyze_Subprogram_Body_Helper --
2255 ------------------------------------
2257 -- This procedure is called for regular subprogram bodies, generic bodies,
2258 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2259 -- specification matters, and is used to create a proper declaration for
2260 -- the subprogram, or to perform conformance checks.
2262 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2263 Loc
: constant Source_Ptr
:= Sloc
(N
);
2264 Body_Spec
: constant Node_Id
:= Specification
(N
);
2265 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2266 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2267 Conformant
: Boolean;
2269 Prot_Typ
: Entity_Id
:= Empty
;
2270 Spec_Id
: Entity_Id
;
2271 Spec_Decl
: Node_Id
:= Empty
;
2273 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2274 -- When we analyze a separate spec, the entity chain ends up containing
2275 -- the formals, as well as any itypes generated during analysis of the
2276 -- default expressions for parameters, or the arguments of associated
2277 -- precondition/postcondition pragmas (which are analyzed in the context
2278 -- of the spec since they have visibility on formals).
2280 -- These entities belong with the spec and not the body. However we do
2281 -- the analysis of the body in the context of the spec (again to obtain
2282 -- visibility to the formals), and all the entities generated during
2283 -- this analysis end up also chained to the entity chain of the spec.
2284 -- But they really belong to the body, and there is circuitry to move
2285 -- them from the spec to the body.
2287 -- However, when we do this move, we don't want to move the real spec
2288 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2289 -- variable points to the last real spec entity, so we only move those
2290 -- chained beyond that point. It is initialized to Empty to deal with
2291 -- the case where there is no separate spec.
2293 procedure Analyze_Aspects_On_Body_Or_Stub
;
2294 -- Analyze the aspect specifications of a subprogram body [stub]. It is
2295 -- assumed that N has aspects.
2297 function Body_Has_Contract
return Boolean;
2298 -- Check whether unanalyzed body has an aspect or pragma that may
2299 -- generate a SPARK contract.
2301 procedure Check_Anonymous_Return
;
2302 -- Ada 2005: if a function returns an access type that denotes a task,
2303 -- or a type that contains tasks, we must create a master entity for
2304 -- the anonymous type, which typically will be used in an allocator
2305 -- in the body of the function.
2307 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2308 -- Look ahead to recognize a pragma that may appear after the body.
2309 -- If there is a previous spec, check that it appears in the same
2310 -- declarative part. If the pragma is Inline_Always, perform inlining
2311 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2312 -- If the body acts as a spec, and inlining is required, we create a
2313 -- subprogram declaration for it, in order to attach the body to inline.
2314 -- If pragma does not appear after the body, check whether there is
2315 -- an inline pragma before any local declarations.
2317 procedure Check_Missing_Return
;
2318 -- Checks for a function with a no return statements, and also performs
2319 -- the warning checks implemented by Check_Returns. In formal mode, also
2320 -- verify that a function ends with a RETURN and that a procedure does
2321 -- not contain any RETURN.
2323 function Disambiguate_Spec
return Entity_Id
;
2324 -- When a primitive is declared between the private view and the full
2325 -- view of a concurrent type which implements an interface, a special
2326 -- mechanism is used to find the corresponding spec of the primitive
2329 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
);
2330 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2331 -- incomplete types coming from a limited context and swap their limited
2332 -- views with the non-limited ones.
2334 function Is_Private_Concurrent_Primitive
2335 (Subp_Id
: Entity_Id
) return Boolean;
2336 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2337 -- type that implements an interface and has a private view.
2339 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2340 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2341 -- subprogram whose body is being analyzed. N is the statement node
2342 -- causing the flag to be set, if the following statement is a return
2343 -- of an entity, we mark the entity as set in source to suppress any
2344 -- warning on the stylized use of function stubs with a dummy return.
2346 procedure Verify_Overriding_Indicator
;
2347 -- If there was a previous spec, the entity has been entered in the
2348 -- current scope previously. If the body itself carries an overriding
2349 -- indicator, check that it is consistent with the known status of the
2352 -------------------------------------
2353 -- Analyze_Aspects_On_Body_Or_Stub --
2354 -------------------------------------
2356 procedure Analyze_Aspects_On_Body_Or_Stub
is
2357 procedure Diagnose_Misplaced_Aspects
;
2358 -- Subprogram body [stub] N has aspects, but they are not properly
2359 -- placed. Provide precise diagnostics depending on the aspects
2362 --------------------------------
2363 -- Diagnose_Misplaced_Aspects --
2364 --------------------------------
2366 procedure Diagnose_Misplaced_Aspects
is
2370 -- The current aspect along with its name and id
2372 procedure SPARK_Aspect_Error
(Ref_Nam
: Name_Id
);
2373 -- Emit an error message concerning SPARK aspect Asp. Ref_Nam is
2374 -- the name of the refined version of the aspect.
2376 ------------------------
2377 -- SPARK_Aspect_Error --
2378 ------------------------
2380 procedure SPARK_Aspect_Error
(Ref_Nam
: Name_Id
) is
2382 -- The corresponding spec already contains the aspect in
2383 -- question and the one appearing on the body must be the
2386 -- procedure P with Global ...;
2387 -- procedure P with Global ... is ... end P;
2391 if Has_Aspect
(Spec_Id
, Asp_Id
) then
2392 Error_Msg_Name_1
:= Asp_Nam
;
2394 -- Subunits cannot carry aspects that apply to a subprogram
2397 if Nkind
(Parent
(N
)) = N_Subunit
then
2398 Error_Msg_N
("aspect % cannot apply to a subunit", Asp
);
2401 Error_Msg_Name_2
:= Ref_Nam
;
2402 Error_Msg_N
("aspect % should be %", Asp
);
2405 -- Otherwise the aspect must appear in the spec, not in the
2409 -- procedure P with Global ... is ... end P;
2413 ("aspect specification must appear in subprogram "
2414 & "declaration", Asp
);
2416 end SPARK_Aspect_Error
;
2418 -- Start of processing for Diagnose_Misplaced_Aspects
2421 -- Iterate over the aspect specifications and emit specific errors
2422 -- where applicable.
2424 Asp
:= First
(Aspect_Specifications
(N
));
2425 while Present
(Asp
) loop
2426 Asp_Nam
:= Chars
(Identifier
(Asp
));
2427 Asp_Id
:= Get_Aspect_Id
(Asp_Nam
);
2429 -- Do not emit errors on aspects that can appear on a
2430 -- subprogram body. This scenario occurs when the aspect
2431 -- specification list contains both misplaced and properly
2434 if Aspect_On_Body_Or_Stub_OK
(Asp_Id
) then
2437 -- Special diagnostics for SPARK aspects
2439 elsif Asp_Nam
= Name_Depends
then
2440 SPARK_Aspect_Error
(Name_Refined_Depends
);
2442 elsif Asp_Nam
= Name_Global
then
2443 SPARK_Aspect_Error
(Name_Refined_Global
);
2445 elsif Asp_Nam
= Name_Post
then
2446 SPARK_Aspect_Error
(Name_Refined_Post
);
2450 ("aspect specification must appear in subprogram "
2451 & "declaration", Asp
);
2456 end Diagnose_Misplaced_Aspects
;
2458 -- Start of processing for Analyze_Aspects_On_Body_Or_Stub
2461 -- Language-defined aspects cannot be associated with a subprogram
2462 -- body [stub] if the subprogram has a spec. Certain implementation
2463 -- defined aspects are allowed to break this rule (for list, see
2464 -- table Aspect_On_Body_Or_Stub_OK).
2466 if Present
(Spec_Id
) and then not Aspects_On_Body_Or_Stub_OK
(N
) then
2467 Diagnose_Misplaced_Aspects
;
2469 Analyze_Aspect_Specifications
(N
, Body_Id
);
2471 end Analyze_Aspects_On_Body_Or_Stub
;
2473 -----------------------
2474 -- Body_Has_Contract --
2475 -----------------------
2477 function Body_Has_Contract
return Boolean is
2478 Decls
: constant List_Id
:= Declarations
(N
);
2485 -- Check for unanalyzed aspects in the body that will
2486 -- generate a contract.
2488 if Present
(Aspect_Specifications
(N
)) then
2489 A_Spec
:= First
(Aspect_Specifications
(N
));
2490 while Present
(A_Spec
) loop
2491 A
:= Get_Aspect_Id
(Chars
(Identifier
(A_Spec
)));
2493 if A
= Aspect_Contract_Cases
or else
2494 A
= Aspect_Depends
or else
2495 A
= Aspect_Global
or else
2496 A
= Aspect_Pre
or else
2497 A
= Aspect_Precondition
or else
2498 A
= Aspect_Post
or else
2499 A
= Aspect_Postcondition
2508 -- Check for pragmas that may generate a contract
2510 if Present
(Decls
) then
2511 Decl
:= First
(Decls
);
2512 while Present
(Decl
) loop
2513 if Nkind
(Decl
) = N_Pragma
then
2514 P_Id
:= Get_Pragma_Id
(Pragma_Name
(Decl
));
2516 if P_Id
= Pragma_Contract_Cases
or else
2517 P_Id
= Pragma_Depends
or else
2518 P_Id
= Pragma_Global
or else
2519 P_Id
= Pragma_Pre
or else
2520 P_Id
= Pragma_Precondition
or else
2521 P_Id
= Pragma_Post
or else
2522 P_Id
= Pragma_Postcondition
2533 end Body_Has_Contract
;
2535 ----------------------------
2536 -- Check_Anonymous_Return --
2537 ----------------------------
2539 procedure Check_Anonymous_Return
is
2545 if Present
(Spec_Id
) then
2551 if Ekind
(Scop
) = E_Function
2552 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2553 and then not Is_Thunk
(Scop
)
2555 -- Skip internally built functions which handle the case of
2556 -- a null access (see Expand_Interface_Conversion)
2558 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2559 and then not Comes_From_Source
(Parent
(Scop
)))
2561 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2563 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2565 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2566 and then Expander_Active
2568 -- Avoid cases with no tasking support
2570 and then RTE_Available
(RE_Current_Master
)
2571 and then not Restriction_Active
(No_Task_Hierarchy
)
2574 Make_Object_Declaration
(Loc
,
2575 Defining_Identifier
=>
2576 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2577 Constant_Present
=> True,
2578 Object_Definition
=>
2579 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2581 Make_Explicit_Dereference
(Loc
,
2582 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2584 if Present
(Declarations
(N
)) then
2585 Prepend
(Decl
, Declarations
(N
));
2587 Set_Declarations
(N
, New_List
(Decl
));
2590 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2591 Set_Has_Master_Entity
(Scop
);
2593 -- Now mark the containing scope as a task master
2596 while Nkind
(Par
) /= N_Compilation_Unit
loop
2597 Par
:= Parent
(Par
);
2598 pragma Assert
(Present
(Par
));
2600 -- If we fall off the top, we are at the outer level, and
2601 -- the environment task is our effective master, so nothing
2605 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2607 Set_Is_Task_Master
(Par
, True);
2612 end Check_Anonymous_Return
;
2614 -------------------------
2615 -- Check_Inline_Pragma --
2616 -------------------------
2618 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2622 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2623 -- True when N is a pragma Inline or Inline_Always that applies
2624 -- to this subprogram.
2626 -----------------------
2627 -- Is_Inline_Pragma --
2628 -----------------------
2630 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2633 Nkind
(N
) = N_Pragma
2635 (Pragma_Name
(N
) = Name_Inline_Always
2638 and then Pragma_Name
(N
) = Name_Inline
))
2641 (Expression
(First
(Pragma_Argument_Associations
(N
)))) =
2643 end Is_Inline_Pragma
;
2645 -- Start of processing for Check_Inline_Pragma
2648 if not Expander_Active
then
2652 if Is_List_Member
(N
)
2653 and then Present
(Next
(N
))
2654 and then Is_Inline_Pragma
(Next
(N
))
2658 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2659 and then Present
(Declarations
(N
))
2660 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2662 Prag
:= First
(Declarations
(N
));
2668 if Present
(Prag
) then
2669 if Present
(Spec_Id
) then
2670 if In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
)) then
2675 -- Create a subprogram declaration, to make treatment uniform
2678 Subp
: constant Entity_Id
:=
2679 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
2680 Decl
: constant Node_Id
:=
2681 Make_Subprogram_Declaration
(Loc
,
2683 New_Copy_Tree
(Specification
(N
)));
2686 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2688 if Present
(First_Formal
(Body_Id
)) then
2689 Plist
:= Copy_Parameter_List
(Body_Id
);
2690 Set_Parameter_Specifications
2691 (Specification
(Decl
), Plist
);
2694 Insert_Before
(N
, Decl
);
2697 Set_Has_Pragma_Inline
(Subp
);
2699 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2700 Set_Is_Inlined
(Subp
);
2701 Set_Has_Pragma_Inline_Always
(Subp
);
2704 -- Prior to copying the subprogram body to create a template
2705 -- for it for subsequent inlining, remove the pragma from
2706 -- the current body so that the copy that will produce the
2707 -- new body will start from a completely unanalyzed tree.
2709 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2710 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2717 end Check_Inline_Pragma
;
2719 --------------------------
2720 -- Check_Missing_Return --
2721 --------------------------
2723 procedure Check_Missing_Return
is
2725 Missing_Ret
: Boolean;
2728 if Nkind
(Body_Spec
) = N_Function_Specification
then
2729 if Present
(Spec_Id
) then
2735 if Return_Present
(Id
) then
2736 Check_Returns
(HSS
, 'F', Missing_Ret
);
2739 Set_Has_Missing_Return
(Id
);
2742 elsif Is_Generic_Subprogram
(Id
)
2743 or else not Is_Machine_Code_Subprogram
(Id
)
2745 Error_Msg_N
("missing RETURN statement in function body", N
);
2748 -- If procedure with No_Return, check returns
2750 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2751 and then Present
(Spec_Id
)
2752 and then No_Return
(Spec_Id
)
2754 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2757 -- Special checks in SPARK mode
2759 if Nkind
(Body_Spec
) = N_Function_Specification
then
2761 -- In SPARK mode, last statement of a function should be a return
2764 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
2767 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
2768 N_Extended_Return_Statement
)
2770 Check_SPARK_05_Restriction
2771 ("last statement in function should be RETURN", Stat
);
2775 -- In SPARK mode, verify that a procedure has no return
2777 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
2778 if Present
(Spec_Id
) then
2784 -- Would be nice to point to return statement here, can we
2785 -- borrow the Check_Returns procedure here ???
2787 if Return_Present
(Id
) then
2788 Check_SPARK_05_Restriction
2789 ("procedure should not have RETURN", N
);
2792 end Check_Missing_Return
;
2794 -----------------------
2795 -- Disambiguate_Spec --
2796 -----------------------
2798 function Disambiguate_Spec
return Entity_Id
is
2799 Priv_Spec
: Entity_Id
;
2802 procedure Replace_Types
(To_Corresponding
: Boolean);
2803 -- Depending on the flag, replace the type of formal parameters of
2804 -- Body_Id if it is a concurrent type implementing interfaces with
2805 -- the corresponding record type or the other way around.
2807 procedure Replace_Types
(To_Corresponding
: Boolean) is
2809 Formal_Typ
: Entity_Id
;
2812 Formal
:= First_Formal
(Body_Id
);
2813 while Present
(Formal
) loop
2814 Formal_Typ
:= Etype
(Formal
);
2816 if Is_Class_Wide_Type
(Formal_Typ
) then
2817 Formal_Typ
:= Root_Type
(Formal_Typ
);
2820 -- From concurrent type to corresponding record
2822 if To_Corresponding
then
2823 if Is_Concurrent_Type
(Formal_Typ
)
2824 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2825 and then Present
(Interfaces
(
2826 Corresponding_Record_Type
(Formal_Typ
)))
2829 Corresponding_Record_Type
(Formal_Typ
));
2832 -- From corresponding record to concurrent type
2835 if Is_Concurrent_Record_Type
(Formal_Typ
)
2836 and then Present
(Interfaces
(Formal_Typ
))
2839 Corresponding_Concurrent_Type
(Formal_Typ
));
2843 Next_Formal
(Formal
);
2847 -- Start of processing for Disambiguate_Spec
2850 -- Try to retrieve the specification of the body as is. All error
2851 -- messages are suppressed because the body may not have a spec in
2852 -- its current state.
2854 Spec_N
:= Find_Corresponding_Spec
(N
, False);
2856 -- It is possible that this is the body of a primitive declared
2857 -- between a private and a full view of a concurrent type. The
2858 -- controlling parameter of the spec carries the concurrent type,
2859 -- not the corresponding record type as transformed by Analyze_
2860 -- Subprogram_Specification. In such cases, we undo the change
2861 -- made by the analysis of the specification and try to find the
2864 -- Note that wrappers already have their corresponding specs and
2865 -- bodies set during their creation, so if the candidate spec is
2866 -- a wrapper, then we definitely need to swap all types to their
2867 -- original concurrent status.
2870 or else Is_Primitive_Wrapper
(Spec_N
)
2872 -- Restore all references of corresponding record types to the
2873 -- original concurrent types.
2875 Replace_Types
(To_Corresponding
=> False);
2876 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
2878 -- The current body truly belongs to a primitive declared between
2879 -- a private and a full view. We leave the modified body as is,
2880 -- and return the true spec.
2882 if Present
(Priv_Spec
)
2883 and then Is_Private_Primitive
(Priv_Spec
)
2888 -- In case that this is some sort of error, restore the original
2889 -- state of the body.
2891 Replace_Types
(To_Corresponding
=> True);
2895 end Disambiguate_Spec
;
2897 ----------------------------
2898 -- Exchange_Limited_Views --
2899 ----------------------------
2901 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
) is
2902 procedure Detect_And_Exchange
(Id
: Entity_Id
);
2903 -- Determine whether Id's type denotes an incomplete type associated
2904 -- with a limited with clause and exchange the limited view with the
2907 -------------------------
2908 -- Detect_And_Exchange --
2909 -------------------------
2911 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
2912 Typ
: constant Entity_Id
:= Etype
(Id
);
2915 if Ekind
(Typ
) = E_Incomplete_Type
2916 and then From_Limited_With
(Typ
)
2917 and then Present
(Non_Limited_View
(Typ
))
2919 Set_Etype
(Id
, Non_Limited_View
(Typ
));
2921 end Detect_And_Exchange
;
2927 -- Start of processing for Exchange_Limited_Views
2930 if No
(Subp_Id
) then
2933 -- Do not process subprogram bodies as they already use the non-
2934 -- limited view of types.
2936 elsif not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
2940 -- Examine all formals and swap views when applicable
2942 Formal
:= First_Formal
(Subp_Id
);
2943 while Present
(Formal
) loop
2944 Detect_And_Exchange
(Formal
);
2946 Next_Formal
(Formal
);
2949 -- Process the return type of a function
2951 if Ekind
(Subp_Id
) = E_Function
then
2952 Detect_And_Exchange
(Subp_Id
);
2954 end Exchange_Limited_Views
;
2956 -------------------------------------
2957 -- Is_Private_Concurrent_Primitive --
2958 -------------------------------------
2960 function Is_Private_Concurrent_Primitive
2961 (Subp_Id
: Entity_Id
) return Boolean
2963 Formal_Typ
: Entity_Id
;
2966 if Present
(First_Formal
(Subp_Id
)) then
2967 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
2969 if Is_Concurrent_Record_Type
(Formal_Typ
) then
2970 if Is_Class_Wide_Type
(Formal_Typ
) then
2971 Formal_Typ
:= Root_Type
(Formal_Typ
);
2974 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
2977 -- The type of the first formal is a concurrent tagged type with
2981 Is_Concurrent_Type
(Formal_Typ
)
2982 and then Is_Tagged_Type
(Formal_Typ
)
2983 and then Has_Private_Declaration
(Formal_Typ
);
2987 end Is_Private_Concurrent_Primitive
;
2989 ----------------------------
2990 -- Set_Trivial_Subprogram --
2991 ----------------------------
2993 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
2994 Nxt
: constant Node_Id
:= Next
(N
);
2997 Set_Is_Trivial_Subprogram
(Body_Id
);
2999 if Present
(Spec_Id
) then
3000 Set_Is_Trivial_Subprogram
(Spec_Id
);
3004 and then Nkind
(Nxt
) = N_Simple_Return_Statement
3005 and then No
(Next
(Nxt
))
3006 and then Present
(Expression
(Nxt
))
3007 and then Is_Entity_Name
(Expression
(Nxt
))
3009 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
3011 end Set_Trivial_Subprogram
;
3013 ---------------------------------
3014 -- Verify_Overriding_Indicator --
3015 ---------------------------------
3017 procedure Verify_Overriding_Indicator
is
3019 if Must_Override
(Body_Spec
) then
3020 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3021 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3025 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
3027 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
3029 -- Overriding indicators aren't allowed for protected subprogram
3030 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3031 -- this to a warning if -gnatd.E is enabled.
3033 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3034 Error_Msg_Warn
:= Error_To_Warning
;
3036 ("<<overriding indicator not allowed for protected "
3037 & "subprogram body", Body_Spec
);
3040 elsif Must_Not_Override
(Body_Spec
) then
3041 if Present
(Overridden_Operation
(Spec_Id
)) then
3043 ("subprogram& overrides inherited operation",
3044 Body_Spec
, Spec_Id
);
3046 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3047 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3050 ("subprogram& overrides predefined operator ",
3051 Body_Spec
, Spec_Id
);
3053 -- Overriding indicators aren't allowed for protected subprogram
3054 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3055 -- this to a warning if -gnatd.E is enabled.
3057 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3058 Error_Msg_Warn
:= Error_To_Warning
;
3061 ("<<overriding indicator not allowed "
3062 & "for protected subprogram body", Body_Spec
);
3064 -- If this is not a primitive operation, then the overriding
3065 -- indicator is altogether illegal.
3067 elsif not Is_Primitive
(Spec_Id
) then
3069 ("overriding indicator only allowed "
3070 & "if subprogram is primitive", Body_Spec
);
3073 -- If checking the style rule and the operation overrides, then
3074 -- issue a warning about a missing overriding_indicator. Protected
3075 -- subprogram bodies are excluded from this style checking, since
3076 -- they aren't primitives (even though their declarations can
3077 -- override) and aren't allowed to have an overriding_indicator.
3080 and then Present
(Overridden_Operation
(Spec_Id
))
3081 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3083 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3084 Style
.Missing_Overriding
(N
, Body_Id
);
3087 and then Can_Override_Operator
(Spec_Id
)
3088 and then not Is_Predefined_File_Name
3089 (Unit_File_Name
(Get_Source_Unit
(Spec_Id
)))
3091 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3092 Style
.Missing_Overriding
(N
, Body_Id
);
3094 end Verify_Overriding_Indicator
;
3096 -- Start of processing for Analyze_Subprogram_Body_Helper
3099 -- Generic subprograms are handled separately. They always have a
3100 -- generic specification. Determine whether current scope has a
3101 -- previous declaration.
3103 -- If the subprogram body is defined within an instance of the same
3104 -- name, the instance appears as a package renaming, and will be hidden
3105 -- within the subprogram.
3107 if Present
(Prev_Id
)
3108 and then not Is_Overloadable
(Prev_Id
)
3109 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3110 or else Comes_From_Source
(Prev_Id
))
3112 if Is_Generic_Subprogram
(Prev_Id
) then
3114 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3115 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3117 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3119 if Nkind
(N
) = N_Subprogram_Body
then
3120 HSS
:= Handled_Statement_Sequence
(N
);
3121 Check_Missing_Return
;
3127 -- Previous entity conflicts with subprogram name. Attempting to
3128 -- enter name will post error.
3130 Enter_Name
(Body_Id
);
3134 -- Non-generic case, find the subprogram declaration, if one was seen,
3135 -- or enter new overloaded entity in the current scope. If the
3136 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3137 -- part of the context of one of its subunits. No need to redo the
3140 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3144 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3146 if Nkind
(N
) = N_Subprogram_Body_Stub
3147 or else No
(Corresponding_Spec
(N
))
3149 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3150 Spec_Id
:= Disambiguate_Spec
;
3152 Spec_Id
:= Find_Corresponding_Spec
(N
);
3154 -- In GNATprove mode, if the body has no previous spec, create
3155 -- one so that the inlining machinery can operate properly.
3156 -- Transfer aspects, if any, to the new spec, so that they
3157 -- are legal and can be processed ahead of the body.
3158 -- We make two copies of the given spec, one for the new
3159 -- declaration, and one for the body.
3162 and then GNATprove_Mode
3164 -- Inlining does not apply during pre-analysis of code
3166 and then Full_Analysis
3168 -- Inlining only applies to full bodies, not stubs
3170 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3172 -- Inlining only applies to bodies in the source code, not to
3173 -- those generated by the compiler. In particular, expression
3174 -- functions, whose body is generated by the compiler, are
3175 -- treated specially by GNATprove.
3177 and then Comes_From_Source
(Body_Id
)
3179 -- This cannot be done for a compilation unit, which is not
3180 -- in a context where we can insert a new spec.
3182 and then Is_List_Member
(N
)
3184 -- Inlining only applies to subprograms without contracts,
3185 -- as a contract is a sign that GNATprove should perform a
3186 -- modular analysis of the subprogram instead of a contextual
3187 -- analysis at each call site. The same test is performed in
3188 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3189 -- here in another form (because the contract has not
3190 -- been attached to the body) to avoid frontend errors in
3191 -- case pragmas are used instead of aspects, because the
3192 -- corresponding pragmas in the body would not be transferred
3193 -- to the spec, leading to legality errors.
3195 and then not Body_Has_Contract
3198 Body_Spec
: constant Node_Id
:=
3199 Copy_Separate_Tree
(Specification
(N
));
3200 New_Decl
: constant Node_Id
:=
3201 Make_Subprogram_Declaration
(Loc
,
3202 Copy_Separate_Tree
(Specification
(N
)));
3204 SPARK_Mode_Aspect
: Node_Id
;
3206 Prag
, Aspect
: Node_Id
;
3209 Insert_Before
(N
, New_Decl
);
3210 Move_Aspects
(From
=> N
, To
=> New_Decl
);
3212 -- Mark the newly moved aspects as not analyzed, so that
3213 -- their effect on New_Decl is properly analyzed.
3215 Aspect
:= First
(Aspect_Specifications
(New_Decl
));
3216 while Present
(Aspect
) loop
3217 Set_Analyzed
(Aspect
, False);
3223 -- The analysis of the generated subprogram declaration
3224 -- may have introduced pragmas that need to be analyzed.
3226 Prag
:= Next
(New_Decl
);
3227 while Prag
/= N
loop
3232 Spec_Id
:= Defining_Entity
(New_Decl
);
3234 -- As Body_Id originally comes from source, mark the new
3235 -- Spec_Id as such, which is required so that calls to
3236 -- this subprogram are registered in the local effects
3237 -- stored in ALI files for GNATprove.
3239 Set_Comes_From_Source
(Spec_Id
, True);
3241 -- If aspect SPARK_Mode was specified on the body, it
3242 -- needs to be repeated on the generated decl and the
3243 -- body. Since the original aspect was moved to the
3244 -- generated decl, copy it for the body.
3246 if Has_Aspect
(Spec_Id
, Aspect_SPARK_Mode
) then
3247 SPARK_Mode_Aspect
:=
3248 New_Copy
(Find_Aspect
(Spec_Id
, Aspect_SPARK_Mode
));
3249 Set_Analyzed
(SPARK_Mode_Aspect
, False);
3250 Aspects
:= New_List
(SPARK_Mode_Aspect
);
3251 Set_Aspect_Specifications
(N
, Aspects
);
3254 Set_Specification
(N
, Body_Spec
);
3255 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3256 Set_Corresponding_Spec
(N
, Spec_Id
);
3261 -- If this is a duplicate body, no point in analyzing it
3263 if Error_Posted
(N
) then
3267 -- A subprogram body should cause freezing of its own declaration,
3268 -- but if there was no previous explicit declaration, then the
3269 -- subprogram will get frozen too late (there may be code within
3270 -- the body that depends on the subprogram having been frozen,
3271 -- such as uses of extra formals), so we force it to be frozen
3272 -- here. Same holds if the body and spec are compilation units.
3273 -- Finally, if the return type is an anonymous access to protected
3274 -- subprogram, it must be frozen before the body because its
3275 -- expansion has generated an equivalent type that is used when
3276 -- elaborating the body.
3278 -- An exception in the case of Ada 2012, AI05-177: The bodies
3279 -- created for expression functions do not freeze.
3282 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3284 Freeze_Before
(N
, Body_Id
);
3286 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3287 Freeze_Before
(N
, Spec_Id
);
3289 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3290 Freeze_Before
(N
, Etype
(Body_Id
));
3294 Spec_Id
:= Corresponding_Spec
(N
);
3298 -- Previously we scanned the body to look for nested subprograms, and
3299 -- rejected an inline directive if nested subprograms were present,
3300 -- because the back-end would generate conflicting symbols for the
3301 -- nested bodies. This is now unnecessary.
3303 -- Look ahead to recognize a pragma Inline that appears after the body
3305 Check_Inline_Pragma
(Spec_Id
);
3307 -- Deal with special case of a fully private operation in the body of
3308 -- the protected type. We must create a declaration for the subprogram,
3309 -- in order to attach the protected subprogram that will be used in
3310 -- internal calls. We exclude compiler generated bodies from the
3311 -- expander since the issue does not arise for those cases.
3314 and then Comes_From_Source
(N
)
3315 and then Is_Protected_Type
(Current_Scope
)
3317 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3320 -- If a separate spec is present, then deal with freezing issues
3322 if Present
(Spec_Id
) then
3323 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3324 Verify_Overriding_Indicator
;
3326 -- In general, the spec will be frozen when we start analyzing the
3327 -- body. However, for internally generated operations, such as
3328 -- wrapper functions for inherited operations with controlling
3329 -- results, the spec may not have been frozen by the time we expand
3330 -- the freeze actions that include the bodies. In particular, extra
3331 -- formals for accessibility or for return-in-place may need to be
3332 -- generated. Freeze nodes, if any, are inserted before the current
3333 -- body. These freeze actions are also needed in ASIS mode to enable
3334 -- the proper back-annotations.
3336 if not Is_Frozen
(Spec_Id
)
3337 and then (Expander_Active
or ASIS_Mode
)
3339 -- Force the generation of its freezing node to ensure proper
3340 -- management of access types in the backend.
3342 -- This is definitely needed for some cases, but it is not clear
3343 -- why, to be investigated further???
3345 Set_Has_Delayed_Freeze
(Spec_Id
);
3346 Freeze_Before
(N
, Spec_Id
);
3350 -- Mark presence of postcondition procedure in current scope and mark
3351 -- the procedure itself as needing debug info. The latter is important
3352 -- when analyzing decision coverage (for example, for MC/DC coverage).
3354 if Chars
(Body_Id
) = Name_uPostconditions
then
3355 Set_Has_Postconditions
(Current_Scope
);
3356 Set_Debug_Info_Needed
(Body_Id
);
3359 -- Place subprogram on scope stack, and make formals visible. If there
3360 -- is a spec, the visible entity remains that of the spec.
3362 if Present
(Spec_Id
) then
3363 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3365 if Is_Child_Unit
(Spec_Id
) then
3366 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3370 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3373 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3374 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3376 if Is_Abstract_Subprogram
(Spec_Id
) then
3377 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3381 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3382 Set_Has_Completion
(Spec_Id
);
3384 -- Inherit the "ghostness" of the subprogram spec. Note that this
3385 -- property is not directly inherited as the body may be subject
3386 -- to a different Ghost assertion policy.
3388 if Is_Ghost_Entity
(Spec_Id
) or else Within_Ghost_Scope
then
3389 Set_Is_Ghost_Entity
(Body_Id
);
3391 -- The Ghost policy in effect at the point of declaration and
3392 -- at the point of completion must match (SPARK RM 6.9(15)).
3394 Check_Ghost_Completion
(Spec_Id
, Body_Id
);
3397 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3398 Prot_Typ
:= Scope
(Spec_Id
);
3401 -- If this is a body generated for a renaming, do not check for
3402 -- full conformance. The check is redundant, because the spec of
3403 -- the body is a copy of the spec in the renaming declaration,
3404 -- and the test can lead to spurious errors on nested defaults.
3406 if Present
(Spec_Decl
)
3407 and then not Comes_From_Source
(N
)
3409 (Nkind
(Original_Node
(Spec_Decl
)) =
3410 N_Subprogram_Renaming_Declaration
3411 or else (Present
(Corresponding_Body
(Spec_Decl
))
3413 Nkind
(Unit_Declaration_Node
3414 (Corresponding_Body
(Spec_Decl
))) =
3415 N_Subprogram_Renaming_Declaration
))
3419 -- Conversely, the spec may have been generated for specless body
3420 -- with an inline pragma.
3422 elsif Comes_From_Source
(N
)
3423 and then not Comes_From_Source
(Spec_Id
)
3424 and then Has_Pragma_Inline
(Spec_Id
)
3431 Fully_Conformant
, True, Conformant
, Body_Id
);
3434 -- If the body is not fully conformant, we have to decide if we
3435 -- should analyze it or not. If it has a really messed up profile
3436 -- then we probably should not analyze it, since we will get too
3437 -- many bogus messages.
3439 -- Our decision is to go ahead in the non-fully conformant case
3440 -- only if it is at least mode conformant with the spec. Note
3441 -- that the call to Check_Fully_Conformant has issued the proper
3442 -- error messages to complain about the lack of conformance.
3445 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3451 if Spec_Id
/= Body_Id
then
3452 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3455 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3457 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3458 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3463 Set_Corresponding_Spec
(N
, Spec_Id
);
3465 -- Ada 2005 (AI-345): If the operation is a primitive operation
3466 -- of a concurrent type, the type of the first parameter has been
3467 -- replaced with the corresponding record, which is the proper
3468 -- run-time structure to use. However, within the body there may
3469 -- be uses of the formals that depend on primitive operations
3470 -- of the type (in particular calls in prefixed form) for which
3471 -- we need the original concurrent type. The operation may have
3472 -- several controlling formals, so the replacement must be done
3475 if Comes_From_Source
(Spec_Id
)
3476 and then Present
(First_Entity
(Spec_Id
))
3477 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3478 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3479 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3480 and then Present
(Corresponding_Concurrent_Type
3481 (Etype
(First_Entity
(Spec_Id
))))
3484 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3488 Form
:= First_Formal
(Spec_Id
);
3489 while Present
(Form
) loop
3490 if Etype
(Form
) = Typ
then
3491 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3499 -- Make the formals visible, and place subprogram on scope stack.
3500 -- This is also the point at which we set Last_Real_Spec_Entity
3501 -- to mark the entities which will not be moved to the body.
3503 Install_Formals
(Spec_Id
);
3504 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3506 -- Within an instance, add local renaming declarations so that
3507 -- gdb can retrieve the values of actuals more easily. This is
3508 -- only relevant if generating code (and indeed we definitely
3509 -- do not want these definitions -gnatc mode, because that would
3512 if Is_Generic_Instance
(Spec_Id
)
3513 and then Is_Wrapper_Package
(Current_Scope
)
3514 and then Expander_Active
3516 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3519 Push_Scope
(Spec_Id
);
3521 -- Make sure that the subprogram is immediately visible. For
3522 -- child units that have no separate spec this is indispensable.
3523 -- Otherwise it is safe albeit redundant.
3525 Set_Is_Immediately_Visible
(Spec_Id
);
3528 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3529 Set_Contract
(Body_Id
, Make_Contract
(Sloc
(Body_Id
)));
3530 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3531 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3533 -- Case of subprogram body with no previous spec
3536 -- Check for style warning required
3540 -- Only apply check for source level subprograms for which checks
3541 -- have not been suppressed.
3543 and then Comes_From_Source
(Body_Id
)
3544 and then not Suppress_Style_Checks
(Body_Id
)
3546 -- No warnings within an instance
3548 and then not In_Instance
3550 -- No warnings for expression functions
3552 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3554 Style
.Body_With_No_Spec
(N
);
3557 New_Overloaded_Entity
(Body_Id
);
3559 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3560 Set_Acts_As_Spec
(N
);
3561 Generate_Definition
(Body_Id
);
3562 Set_Contract
(Body_Id
, Make_Contract
(Sloc
(Body_Id
)));
3564 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3565 Install_Formals
(Body_Id
);
3567 Push_Scope
(Body_Id
);
3570 -- For stubs and bodies with no previous spec, generate references to
3573 Generate_Reference_To_Formals
(Body_Id
);
3576 -- Set SPARK_Mode from context
3578 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
3579 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
3581 -- If the return type is an anonymous access type whose designated type
3582 -- is the limited view of a class-wide type and the non-limited view is
3583 -- available, update the return type accordingly.
3585 if Ada_Version
>= Ada_2005
and then Comes_From_Source
(N
) then
3591 Rtyp
:= Etype
(Current_Scope
);
3593 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
3594 Etyp
:= Directly_Designated_Type
(Rtyp
);
3596 if Is_Class_Wide_Type
(Etyp
)
3597 and then From_Limited_With
(Etyp
)
3599 Set_Directly_Designated_Type
3600 (Etype
(Current_Scope
), Available_View
(Etyp
));
3606 -- If this is the proper body of a stub, we must verify that the stub
3607 -- conforms to the body, and to the previous spec if one was present.
3608 -- We know already that the body conforms to that spec. This test is
3609 -- only required for subprograms that come from source.
3611 if Nkind
(Parent
(N
)) = N_Subunit
3612 and then Comes_From_Source
(N
)
3613 and then not Error_Posted
(Body_Id
)
3614 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
3615 N_Subprogram_Body_Stub
3618 Old_Id
: constant Entity_Id
:=
3620 (Specification
(Corresponding_Stub
(Parent
(N
))));
3622 Conformant
: Boolean := False;
3625 if No
(Spec_Id
) then
3626 Check_Fully_Conformant
(Body_Id
, Old_Id
);
3630 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
3632 if not Conformant
then
3634 -- The stub was taken to be a new declaration. Indicate that
3637 Set_Has_Completion
(Old_Id
, False);
3643 Set_Has_Completion
(Body_Id
);
3644 Check_Eliminated
(Body_Id
);
3646 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3648 -- Analyze any aspect specifications that appear on the subprogram
3651 if Has_Aspects
(N
) then
3652 Analyze_Aspects_On_Body_Or_Stub
;
3655 -- Stop the analysis now as the stub cannot be inlined, plus it does
3656 -- not have declarative or statement lists.
3661 -- Handle frontend inlining
3663 -- Note: Normally we don't do any inlining if expansion is off, since
3664 -- we won't generate code in any case. An exception arises in GNATprove
3665 -- mode where we want to expand some calls in place, even with expansion
3666 -- disabled, since the inlining eases formal verification.
3668 if not GNATprove_Mode
3669 and then Expander_Active
3670 and then Serious_Errors_Detected
= 0
3671 and then Present
(Spec_Id
)
3672 and then Has_Pragma_Inline
(Spec_Id
)
3674 -- Legacy implementation (relying on frontend inlining)
3676 if not Back_End_Inlining
then
3677 if Has_Pragma_Inline_Always
(Spec_Id
)
3678 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
)
3680 Build_Body_To_Inline
(N
, Spec_Id
);
3683 -- New implementation (relying on backend inlining)
3686 if Has_Pragma_Inline_Always
(Spec_Id
)
3687 or else Optimization_Level
> 0
3689 -- Handle function returning an unconstrained type
3691 if Comes_From_Source
(Body_Id
)
3692 and then Ekind
(Spec_Id
) = E_Function
3693 and then Returns_Unconstrained_Type
(Spec_Id
)
3695 -- If function builds in place, i.e. returns a limited type,
3696 -- inlining cannot be done.
3698 and then not Is_Limited_Type
(Etype
(Spec_Id
))
3700 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
3704 Subp_Body
: constant Node_Id
:=
3705 Unit_Declaration_Node
(Body_Id
);
3706 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
3709 -- Do not pass inlining to the backend if the subprogram
3710 -- has declarations or statements which cannot be inlined
3711 -- by the backend. This check is done here to emit an
3712 -- error instead of the generic warning message reported
3713 -- by the GCC backend (ie. "function might not be
3716 if Present
(Subp_Decl
)
3717 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
3721 elsif Has_Excluded_Statement
3724 (Handled_Statement_Sequence
(Subp_Body
)))
3728 -- If the backend inlining is available then at this
3729 -- stage we only have to mark the subprogram as inlined.
3730 -- The expander will take care of registering it in the
3731 -- table of subprograms inlined by the backend a part of
3732 -- processing calls to it (cf. Expand_Call)
3735 Set_Is_Inlined
(Spec_Id
);
3742 -- In GNATprove mode, inline only when there is a separate subprogram
3743 -- declaration for now, as inlining of subprogram bodies acting as
3744 -- declarations, or subprogram stubs, are not supported by frontend
3745 -- inlining. This inlining should occur after analysis of the body, so
3746 -- that it is known whether the value of SPARK_Mode applicable to the
3747 -- body, which can be defined by a pragma inside the body.
3749 elsif GNATprove_Mode
3750 and then Full_Analysis
3751 and then not Inside_A_Generic
3752 and then Present
(Spec_Id
)
3753 and then Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Declaration
3754 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
3755 and then not Body_Has_Contract
3757 Build_Body_To_Inline
(N
, Spec_Id
);
3760 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
3761 -- of the specification we have to install the private withed units.
3762 -- This holds for child units as well.
3764 if Is_Compilation_Unit
(Body_Id
)
3765 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
3767 Install_Private_With_Clauses
(Body_Id
);
3770 Check_Anonymous_Return
;
3772 -- Set the Protected_Formal field of each extra formal of the protected
3773 -- subprogram to reference the corresponding extra formal of the
3774 -- subprogram that implements it. For regular formals this occurs when
3775 -- the protected subprogram's declaration is expanded, but the extra
3776 -- formals don't get created until the subprogram is frozen. We need to
3777 -- do this before analyzing the protected subprogram's body so that any
3778 -- references to the original subprogram's extra formals will be changed
3779 -- refer to the implementing subprogram's formals (see Expand_Formal).
3781 if Present
(Spec_Id
)
3782 and then Is_Protected_Type
(Scope
(Spec_Id
))
3783 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
3786 Impl_Subp
: constant Entity_Id
:=
3787 Protected_Body_Subprogram
(Spec_Id
);
3788 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
3789 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
3791 while Present
(Prot_Ext_Formal
) loop
3792 pragma Assert
(Present
(Impl_Ext_Formal
));
3793 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
3794 Next_Formal_With_Extras
(Prot_Ext_Formal
);
3795 Next_Formal_With_Extras
(Impl_Ext_Formal
);
3800 -- Now we can go on to analyze the body
3802 HSS
:= Handled_Statement_Sequence
(N
);
3803 Set_Actual_Subtypes
(N
, Current_Scope
);
3805 -- Add a declaration for the Protection object, renaming declarations
3806 -- for discriminals and privals and finally a declaration for the entry
3807 -- family index (if applicable). This form of early expansion is done
3808 -- when the Expander is active because Install_Private_Data_Declarations
3809 -- references entities which were created during regular expansion. The
3810 -- subprogram entity must come from source, and not be an internally
3811 -- generated subprogram.
3814 and then Present
(Prot_Typ
)
3815 and then Present
(Spec_Id
)
3816 and then Comes_From_Source
(Spec_Id
)
3817 and then not Is_Eliminated
(Spec_Id
)
3819 Install_Private_Data_Declarations
3820 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
3823 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
3824 -- may now appear in parameter and result profiles. Since the analysis
3825 -- of a subprogram body may use the parameter and result profile of the
3826 -- spec, swap any limited views with their non-limited counterpart.
3828 if Ada_Version
>= Ada_2012
then
3829 Exchange_Limited_Views
(Spec_Id
);
3832 -- Analyze any aspect specifications that appear on the subprogram body
3834 if Has_Aspects
(N
) then
3835 Analyze_Aspects_On_Body_Or_Stub
;
3838 -- Deal with [refined] preconditions, postconditions, Contract_Cases,
3839 -- invariants and predicates associated with the body and its spec.
3840 -- Note that this is not pure expansion as Expand_Subprogram_Contract
3841 -- prepares the contract assertions for generic subprograms or for ASIS.
3842 -- Do not generate contract checks in SPARK mode.
3844 if not GNATprove_Mode
then
3845 Expand_Subprogram_Contract
(N
, Spec_Id
, Body_Id
);
3848 -- Analyze the declarations (this call will analyze the precondition
3849 -- Check pragmas we prepended to the list, as well as the declaration
3850 -- of the _Postconditions procedure).
3852 Analyze_Declarations
(Declarations
(N
));
3854 -- Verify that the SPARK_Mode of the body agrees with that of its spec
3856 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
3857 if Present
(SPARK_Pragma
(Spec_Id
)) then
3858 if Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Spec_Id
)) = Off
3860 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
3862 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3863 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
3864 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
3866 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
3869 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
3873 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3874 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
3875 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
3877 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
3881 -- If SPARK_Mode for body is not On, disable frontend inlining for this
3882 -- subprogram in GNATprove mode, as its body should not be analyzed.
3885 and then GNATprove_Mode
3886 and then Present
(Spec_Id
)
3887 and then Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Declaration
3889 Set_Body_To_Inline
(Parent
(Parent
(Spec_Id
)), Empty
);
3890 Set_Is_Inlined_Always
(Spec_Id
, False);
3893 -- Check completion, and analyze the statements
3896 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
3899 -- Deal with end of scope processing for the body
3901 Process_End_Label
(HSS
, 't', Current_Scope
);
3903 Check_Subprogram_Order
(N
);
3904 Set_Analyzed
(Body_Id
);
3906 -- If we have a separate spec, then the analysis of the declarations
3907 -- caused the entities in the body to be chained to the spec id, but
3908 -- we want them chained to the body id. Only the formal parameters
3909 -- end up chained to the spec id in this case.
3911 if Present
(Spec_Id
) then
3913 -- We must conform to the categorization of our spec
3915 Validate_Categorization_Dependency
(N
, Spec_Id
);
3917 -- And if this is a child unit, the parent units must conform
3919 if Is_Child_Unit
(Spec_Id
) then
3920 Validate_Categorization_Dependency
3921 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
3924 -- Here is where we move entities from the spec to the body
3926 -- Case where there are entities that stay with the spec
3928 if Present
(Last_Real_Spec_Entity
) then
3930 -- No body entities (happens when the only real spec entities come
3931 -- from precondition and postcondition pragmas).
3933 if No
(Last_Entity
(Body_Id
)) then
3935 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
3937 -- Body entities present (formals), so chain stuff past them
3941 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
3944 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
3945 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3946 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
3948 -- Case where there are no spec entities, in this case there can be
3949 -- no body entities either, so just move everything.
3952 pragma Assert
(No
(Last_Entity
(Body_Id
)));
3953 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
3954 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3955 Set_First_Entity
(Spec_Id
, Empty
);
3956 Set_Last_Entity
(Spec_Id
, Empty
);
3960 Check_Missing_Return
;
3962 -- Now we are going to check for variables that are never modified in
3963 -- the body of the procedure. But first we deal with a special case
3964 -- where we want to modify this check. If the body of the subprogram
3965 -- starts with a raise statement or its equivalent, or if the body
3966 -- consists entirely of a null statement, then it is pretty obvious that
3967 -- it is OK to not reference the parameters. For example, this might be
3968 -- the following common idiom for a stubbed function: statement of the
3969 -- procedure raises an exception. In particular this deals with the
3970 -- common idiom of a stubbed function, which appears something like:
3972 -- function F (A : Integer) return Some_Type;
3975 -- raise Program_Error;
3979 -- Here the purpose of X is simply to satisfy the annoying requirement
3980 -- in Ada that there be at least one return, and we certainly do not
3981 -- want to go posting warnings on X that it is not initialized. On
3982 -- the other hand, if X is entirely unreferenced that should still
3985 -- What we do is to detect these cases, and if we find them, flag the
3986 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
3987 -- suppress unwanted warnings. For the case of the function stub above
3988 -- we have a special test to set X as apparently assigned to suppress
3995 -- Skip initial labels (for one thing this occurs when we are in
3996 -- front end ZCX mode, but in any case it is irrelevant), and also
3997 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
3999 Stm
:= First
(Statements
(HSS
));
4000 while Nkind
(Stm
) = N_Label
4001 or else Nkind
(Stm
) in N_Push_xxx_Label
4006 -- Do the test on the original statement before expansion
4009 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
4012 -- If explicit raise statement, turn on flag
4014 if Nkind
(Ostm
) = N_Raise_Statement
then
4015 Set_Trivial_Subprogram
(Stm
);
4017 -- If null statement, and no following statements, turn on flag
4019 elsif Nkind
(Stm
) = N_Null_Statement
4020 and then Comes_From_Source
(Stm
)
4021 and then No
(Next
(Stm
))
4023 Set_Trivial_Subprogram
(Stm
);
4025 -- Check for explicit call cases which likely raise an exception
4027 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
4028 if Is_Entity_Name
(Name
(Ostm
)) then
4030 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
4033 -- If the procedure is marked No_Return, then likely it
4034 -- raises an exception, but in any case it is not coming
4035 -- back here, so turn on the flag.
4038 and then Ekind
(Ent
) = E_Procedure
4039 and then No_Return
(Ent
)
4041 Set_Trivial_Subprogram
(Stm
);
4049 -- Check for variables that are never modified
4055 -- If there is a separate spec, then transfer Never_Set_In_Source
4056 -- flags from out parameters to the corresponding entities in the
4057 -- body. The reason we do that is we want to post error flags on
4058 -- the body entities, not the spec entities.
4060 if Present
(Spec_Id
) then
4061 E1
:= First_Entity
(Spec_Id
);
4062 while Present
(E1
) loop
4063 if Ekind
(E1
) = E_Out_Parameter
then
4064 E2
:= First_Entity
(Body_Id
);
4065 while Present
(E2
) loop
4066 exit when Chars
(E1
) = Chars
(E2
);
4070 if Present
(E2
) then
4071 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
4079 -- Check references in body
4081 Check_References
(Body_Id
);
4083 end Analyze_Subprogram_Body_Helper
;
4085 ---------------------------------
4086 -- Analyze_Subprogram_Contract --
4087 ---------------------------------
4089 procedure Analyze_Subprogram_Contract
(Subp
: Entity_Id
) is
4090 Items
: constant Node_Id
:= Contract
(Subp
);
4091 Case_Prag
: Node_Id
:= Empty
;
4092 Depends
: Node_Id
:= Empty
;
4093 Global
: Node_Id
:= Empty
;
4094 Mode
: SPARK_Mode_Type
;
4096 Post_Prag
: Node_Id
:= Empty
;
4098 Seen_In_Case
: Boolean := False;
4099 Seen_In_Post
: Boolean := False;
4102 -- Due to the timing of contract analysis, delayed pragmas may be
4103 -- subject to the wrong SPARK_Mode, usually that of the enclosing
4104 -- context. To remedy this, restore the original SPARK_Mode of the
4105 -- related subprogram body.
4107 Save_SPARK_Mode_And_Set
(Subp
, Mode
);
4109 if Present
(Items
) then
4111 -- Analyze pre- and postconditions
4113 Prag
:= Pre_Post_Conditions
(Items
);
4114 while Present
(Prag
) loop
4115 Analyze_Pre_Post_Condition_In_Decl_Part
(Prag
, Subp
);
4117 -- Verify whether a postcondition mentions attribute 'Result and
4118 -- its expression introduces a post-state.
4120 if Warn_On_Suspicious_Contract
4121 and then Pragma_Name
(Prag
) = Name_Postcondition
4124 Check_Result_And_Post_State
(Prag
, Seen_In_Post
);
4127 Prag
:= Next_Pragma
(Prag
);
4130 -- Analyze contract-cases and test-cases
4132 Prag
:= Contract_Test_Cases
(Items
);
4133 while Present
(Prag
) loop
4134 Nam
:= Pragma_Name
(Prag
);
4136 if Nam
= Name_Contract_Cases
then
4137 Analyze_Contract_Cases_In_Decl_Part
(Prag
);
4139 -- Verify whether contract-cases mention attribute 'Result and
4140 -- its expression introduces a post-state. Perform the check
4141 -- only when the pragma is legal.
4143 if Warn_On_Suspicious_Contract
4144 and then not Error_Posted
(Prag
)
4147 Check_Result_And_Post_State
(Prag
, Seen_In_Case
);
4151 pragma Assert
(Nam
= Name_Test_Case
);
4152 Analyze_Test_Case_In_Decl_Part
(Prag
, Subp
);
4155 Prag
:= Next_Pragma
(Prag
);
4158 -- Analyze classification pragmas
4160 Prag
:= Classifications
(Items
);
4161 while Present
(Prag
) loop
4162 Nam
:= Pragma_Name
(Prag
);
4164 if Nam
= Name_Depends
then
4167 elsif Nam
= Name_Global
then
4170 -- Note that pragma Extensions_Visible has already been analyzed
4174 Prag
:= Next_Pragma
(Prag
);
4177 -- Analyze Global first as Depends may mention items classified in
4178 -- the global categorization.
4180 if Present
(Global
) then
4181 Analyze_Global_In_Decl_Part
(Global
);
4184 -- Depends must be analyzed after Global in order to see the modes of
4185 -- all global items.
4187 if Present
(Depends
) then
4188 Analyze_Depends_In_Decl_Part
(Depends
);
4192 -- Emit an error when neither the postconditions nor the contract-cases
4193 -- mention attribute 'Result in the context of a function.
4195 if Warn_On_Suspicious_Contract
4196 and then Ekind_In
(Subp
, E_Function
, E_Generic_Function
)
4198 if Present
(Case_Prag
)
4199 and then not Seen_In_Case
4200 and then Present
(Post_Prag
)
4201 and then not Seen_In_Post
4204 ("neither function postcondition nor contract cases mention "
4205 & "result?T?", Post_Prag
);
4207 elsif Present
(Case_Prag
) and then not Seen_In_Case
then
4209 ("contract cases do not mention result?T?", Case_Prag
);
4211 -- OK if we have at least one IN OUT parameter
4213 elsif Present
(Post_Prag
) and then not Seen_In_Post
then
4217 F
:= First_Formal
(Subp
);
4218 while Present
(F
) loop
4219 if Ekind
(F
) = E_In_Out_Parameter
then
4227 -- If no in-out parameters and no mention of Result, the contract
4228 -- is certainly suspicious.
4231 ("function postcondition does not mention result?T?", Post_Prag
);
4235 -- Restore the SPARK_Mode of the enclosing context after all delayed
4236 -- pragmas have been analyzed.
4238 Restore_SPARK_Mode
(Mode
);
4239 end Analyze_Subprogram_Contract
;
4241 ------------------------------------
4242 -- Analyze_Subprogram_Declaration --
4243 ------------------------------------
4245 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4246 Scop
: constant Entity_Id
:= Current_Scope
;
4247 Designator
: Entity_Id
;
4249 Is_Completion
: Boolean;
4250 -- Indicates whether a null procedure declaration is a completion
4253 -- Null procedures are not allowed in SPARK
4255 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4256 and then Null_Present
(Specification
(N
))
4258 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4260 if Is_Protected_Type
(Current_Scope
) then
4261 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4264 Analyze_Null_Procedure
(N
, Is_Completion
);
4266 if Is_Completion
then
4268 -- The null procedure acts as a body, nothing further is needed.
4274 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4276 -- A reference may already have been generated for the unit name, in
4277 -- which case the following call is redundant. However it is needed for
4278 -- declarations that are the rewriting of an expression function.
4280 Generate_Definition
(Designator
);
4282 -- Set SPARK mode from current context (may be overwritten later with
4283 -- explicit pragma).
4285 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4286 Set_SPARK_Pragma_Inherited
(Designator
, True);
4288 -- A subprogram declared within a Ghost scope is automatically Ghost
4289 -- (SPARK RM 6.9(2)).
4291 if Comes_From_Source
(Designator
) and then Within_Ghost_Scope
then
4292 Set_Is_Ghost_Entity
(Designator
);
4295 if Debug_Flag_C
then
4296 Write_Str
("==> subprogram spec ");
4297 Write_Name
(Chars
(Designator
));
4298 Write_Str
(" from ");
4299 Write_Location
(Sloc
(N
));
4304 Validate_RCI_Subprogram_Declaration
(N
);
4305 New_Overloaded_Entity
(Designator
);
4306 Check_Delayed_Subprogram
(Designator
);
4308 -- If the type of the first formal of the current subprogram is a non-
4309 -- generic tagged private type, mark the subprogram as being a private
4310 -- primitive. Ditto if this is a function with controlling result, and
4311 -- the return type is currently private. In both cases, the type of the
4312 -- controlling argument or result must be in the current scope for the
4313 -- operation to be primitive.
4315 if Has_Controlling_Result
(Designator
)
4316 and then Is_Private_Type
(Etype
(Designator
))
4317 and then Scope
(Etype
(Designator
)) = Current_Scope
4318 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4320 Set_Is_Private_Primitive
(Designator
);
4322 elsif Present
(First_Formal
(Designator
)) then
4324 Formal_Typ
: constant Entity_Id
:=
4325 Etype
(First_Formal
(Designator
));
4327 Set_Is_Private_Primitive
(Designator
,
4328 Is_Tagged_Type
(Formal_Typ
)
4329 and then Scope
(Formal_Typ
) = Current_Scope
4330 and then Is_Private_Type
(Formal_Typ
)
4331 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4335 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4338 if Ada_Version
>= Ada_2005
4339 and then Comes_From_Source
(N
)
4340 and then Is_Dispatching_Operation
(Designator
)
4347 if Has_Controlling_Result
(Designator
) then
4348 Etyp
:= Etype
(Designator
);
4351 E
:= First_Entity
(Designator
);
4353 and then Is_Formal
(E
)
4354 and then not Is_Controlling_Formal
(E
)
4362 if Is_Access_Type
(Etyp
) then
4363 Etyp
:= Directly_Designated_Type
(Etyp
);
4366 if Is_Interface
(Etyp
)
4367 and then not Is_Abstract_Subprogram
(Designator
)
4368 and then not (Ekind
(Designator
) = E_Procedure
4369 and then Null_Present
(Specification
(N
)))
4371 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4373 -- Specialize error message based on procedures vs. functions,
4374 -- since functions can't be null subprograms.
4376 if Ekind
(Designator
) = E_Procedure
then
4378 ("interface procedure % must be abstract or null", N
);
4381 ("interface function % must be abstract", N
);
4387 -- What is the following code for, it used to be
4389 -- ??? Set_Suppress_Elaboration_Checks
4390 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4392 -- The following seems equivalent, but a bit dubious
4394 if Elaboration_Checks_Suppressed
(Designator
) then
4395 Set_Kill_Elaboration_Checks
(Designator
);
4398 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4399 Set_Categorization_From_Scope
(Designator
, Scop
);
4402 -- For a compilation unit, check for library-unit pragmas
4404 Push_Scope
(Designator
);
4405 Set_Categorization_From_Pragmas
(N
);
4406 Validate_Categorization_Dependency
(N
, Designator
);
4410 -- For a compilation unit, set body required. This flag will only be
4411 -- reset if a valid Import or Interface pragma is processed later on.
4413 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4414 Set_Body_Required
(Parent
(N
), True);
4416 if Ada_Version
>= Ada_2005
4417 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4418 and then Null_Present
(Specification
(N
))
4421 ("null procedure cannot be declared at library level", N
);
4425 Generate_Reference_To_Formals
(Designator
);
4426 Check_Eliminated
(Designator
);
4428 if Debug_Flag_C
then
4430 Write_Str
("<== subprogram spec ");
4431 Write_Name
(Chars
(Designator
));
4432 Write_Str
(" from ");
4433 Write_Location
(Sloc
(N
));
4437 if Is_Protected_Type
(Current_Scope
) then
4439 -- Indicate that this is a protected operation, because it may be
4440 -- used in subsequent declarations within the protected type.
4442 Set_Convention
(Designator
, Convention_Protected
);
4445 List_Inherited_Pre_Post_Aspects
(Designator
);
4447 if Has_Aspects
(N
) then
4448 Analyze_Aspect_Specifications
(N
, Designator
);
4450 end Analyze_Subprogram_Declaration
;
4452 --------------------------------------
4453 -- Analyze_Subprogram_Specification --
4454 --------------------------------------
4456 -- Reminder: N here really is a subprogram specification (not a subprogram
4457 -- declaration). This procedure is called to analyze the specification in
4458 -- both subprogram bodies and subprogram declarations (specs).
4460 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4461 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4462 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4464 -- Start of processing for Analyze_Subprogram_Specification
4467 -- User-defined operator is not allowed in SPARK, except as a renaming
4469 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4470 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4472 Check_SPARK_05_Restriction
4473 ("user-defined operator is not allowed", N
);
4476 -- Proceed with analysis. Do not emit a cross-reference entry if the
4477 -- specification comes from an expression function, because it may be
4478 -- the completion of a previous declaration. It is is not, the cross-
4479 -- reference entry will be emitted for the new subprogram declaration.
4481 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4482 Generate_Definition
(Designator
);
4485 Set_Contract
(Designator
, Make_Contract
(Sloc
(Designator
)));
4487 if Nkind
(N
) = N_Function_Specification
then
4488 Set_Ekind
(Designator
, E_Function
);
4489 Set_Mechanism
(Designator
, Default_Mechanism
);
4491 Set_Ekind
(Designator
, E_Procedure
);
4492 Set_Etype
(Designator
, Standard_Void_Type
);
4495 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4496 -- those subprograms which could be inlined in GNATprove mode (because
4497 -- Body_To_Inline is non-Empty) but cannot be inlined.
4499 if GNATprove_Mode
then
4500 Set_Is_Inlined_Always
(Designator
);
4503 -- Introduce new scope for analysis of the formals and the return type
4505 Set_Scope
(Designator
, Current_Scope
);
4507 if Present
(Formals
) then
4508 Push_Scope
(Designator
);
4509 Process_Formals
(Formals
, N
);
4511 -- Check dimensions in N for formals with default expression
4513 Analyze_Dimension_Formals
(N
, Formals
);
4515 -- Ada 2005 (AI-345): If this is an overriding operation of an
4516 -- inherited interface operation, and the controlling type is
4517 -- a synchronized type, replace the type with its corresponding
4518 -- record, to match the proper signature of an overriding operation.
4519 -- Same processing for an access parameter whose designated type is
4520 -- derived from a synchronized interface.
4522 if Ada_Version
>= Ada_2005
then
4525 Formal_Typ
: Entity_Id
;
4526 Rec_Typ
: Entity_Id
;
4527 Desig_Typ
: Entity_Id
;
4530 Formal
:= First_Formal
(Designator
);
4531 while Present
(Formal
) loop
4532 Formal_Typ
:= Etype
(Formal
);
4534 if Is_Concurrent_Type
(Formal_Typ
)
4535 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4537 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4539 if Present
(Interfaces
(Rec_Typ
)) then
4540 Set_Etype
(Formal
, Rec_Typ
);
4543 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4544 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4546 if Is_Concurrent_Type
(Desig_Typ
)
4547 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4549 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4551 if Present
(Interfaces
(Rec_Typ
)) then
4552 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
4557 Next_Formal
(Formal
);
4564 -- The subprogram scope is pushed and popped around the processing of
4565 -- the return type for consistency with call above to Process_Formals
4566 -- (which itself can call Analyze_Return_Type), and to ensure that any
4567 -- itype created for the return type will be associated with the proper
4570 elsif Nkind
(N
) = N_Function_Specification
then
4571 Push_Scope
(Designator
);
4572 Analyze_Return_Type
(N
);
4578 if Nkind
(N
) = N_Function_Specification
then
4580 -- Deal with operator symbol case
4582 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
4583 Valid_Operator_Definition
(Designator
);
4586 May_Need_Actuals
(Designator
);
4588 -- Ada 2005 (AI-251): If the return type is abstract, verify that
4589 -- the subprogram is abstract also. This does not apply to renaming
4590 -- declarations, where abstractness is inherited, and to subprogram
4591 -- bodies generated for stream operations, which become renamings as
4594 -- In case of primitives associated with abstract interface types
4595 -- the check is applied later (see Analyze_Subprogram_Declaration).
4597 if not Nkind_In
(Original_Node
(Parent
(N
)),
4598 N_Subprogram_Renaming_Declaration
,
4599 N_Abstract_Subprogram_Declaration
,
4600 N_Formal_Abstract_Subprogram_Declaration
)
4602 if Is_Abstract_Type
(Etype
(Designator
))
4603 and then not Is_Interface
(Etype
(Designator
))
4606 ("function that returns abstract type must be abstract", N
);
4608 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
4609 -- access result whose designated type is abstract.
4611 elsif Nkind
(Result_Definition
(N
)) = N_Access_Definition
4613 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
4614 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
4615 and then Ada_Version
>= Ada_2012
4617 Error_Msg_N
("function whose access result designates "
4618 & "abstract type must be abstract", N
);
4624 end Analyze_Subprogram_Specification
;
4626 -----------------------
4627 -- Check_Conformance --
4628 -----------------------
4630 procedure Check_Conformance
4631 (New_Id
: Entity_Id
;
4633 Ctype
: Conformance_Type
;
4635 Conforms
: out Boolean;
4636 Err_Loc
: Node_Id
:= Empty
;
4637 Get_Inst
: Boolean := False;
4638 Skip_Controlling_Formals
: Boolean := False)
4640 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
4641 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
4642 -- If Errmsg is True, then processing continues to post an error message
4643 -- for conformance error on given node. Two messages are output. The
4644 -- first message points to the previous declaration with a general "no
4645 -- conformance" message. The second is the detailed reason, supplied as
4646 -- Msg. The parameter N provide information for a possible & insertion
4647 -- in the message, and also provides the location for posting the
4648 -- message in the absence of a specified Err_Loc location.
4650 -----------------------
4651 -- Conformance_Error --
4652 -----------------------
4654 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
4661 if No
(Err_Loc
) then
4667 Error_Msg_Sloc
:= Sloc
(Old_Id
);
4670 when Type_Conformant
=>
4671 Error_Msg_N
-- CODEFIX
4672 ("not type conformant with declaration#!", Enode
);
4674 when Mode_Conformant
=>
4675 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4677 ("not mode conformant with operation inherited#!",
4681 ("not mode conformant with declaration#!", Enode
);
4684 when Subtype_Conformant
=>
4685 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4687 ("not subtype conformant with operation inherited#!",
4691 ("not subtype conformant with declaration#!", Enode
);
4694 when Fully_Conformant
=>
4695 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4696 Error_Msg_N
-- CODEFIX
4697 ("not fully conformant with operation inherited#!",
4700 Error_Msg_N
-- CODEFIX
4701 ("not fully conformant with declaration#!", Enode
);
4705 Error_Msg_NE
(Msg
, Enode
, N
);
4707 end Conformance_Error
;
4711 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
4712 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
4713 Old_Formal
: Entity_Id
;
4714 New_Formal
: Entity_Id
;
4715 Access_Types_Match
: Boolean;
4716 Old_Formal_Base
: Entity_Id
;
4717 New_Formal_Base
: Entity_Id
;
4719 -- Start of processing for Check_Conformance
4724 -- We need a special case for operators, since they don't appear
4727 if Ctype
= Type_Conformant
then
4728 if Ekind
(New_Id
) = E_Operator
4729 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
4735 -- If both are functions/operators, check return types conform
4737 if Old_Type
/= Standard_Void_Type
4739 New_Type
/= Standard_Void_Type
4741 -- If we are checking interface conformance we omit controlling
4742 -- arguments and result, because we are only checking the conformance
4743 -- of the remaining parameters.
4745 if Has_Controlling_Result
(Old_Id
)
4746 and then Has_Controlling_Result
(New_Id
)
4747 and then Skip_Controlling_Formals
4751 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
4752 if Ctype
>= Subtype_Conformant
4753 and then not Predicates_Match
(Old_Type
, New_Type
)
4756 ("\predicate of return type does not match!", New_Id
);
4759 ("\return type does not match!", New_Id
);
4765 -- Ada 2005 (AI-231): In case of anonymous access types check the
4766 -- null-exclusion and access-to-constant attributes match.
4768 if Ada_Version
>= Ada_2005
4769 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
4771 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
4772 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
4773 Is_Access_Constant
(Etype
(New_Type
)))
4775 Conformance_Error
("\return type does not match!", New_Id
);
4779 -- If either is a function/operator and the other isn't, error
4781 elsif Old_Type
/= Standard_Void_Type
4782 or else New_Type
/= Standard_Void_Type
4784 Conformance_Error
("\functions can only match functions!", New_Id
);
4788 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
4789 -- If this is a renaming as body, refine error message to indicate that
4790 -- the conflict is with the original declaration. If the entity is not
4791 -- frozen, the conventions don't have to match, the one of the renamed
4792 -- entity is inherited.
4794 if Ctype
>= Subtype_Conformant
then
4795 if Convention
(Old_Id
) /= Convention
(New_Id
) then
4796 if not Is_Frozen
(New_Id
) then
4799 elsif Present
(Err_Loc
)
4800 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
4801 and then Present
(Corresponding_Spec
(Err_Loc
))
4803 Error_Msg_Name_1
:= Chars
(New_Id
);
4805 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
4806 Conformance_Error
("\prior declaration for% has convention %!");
4809 Conformance_Error
("\calling conventions do not match!");
4814 elsif Is_Formal_Subprogram
(Old_Id
)
4815 or else Is_Formal_Subprogram
(New_Id
)
4817 Conformance_Error
("\formal subprograms not allowed!");
4820 -- Pragma Ghost behaves as a convention in the context of subtype
4821 -- conformance (SPARK RM 6.9(5)). Do not check internally generated
4822 -- subprograms as their spec may reside in a Ghost region and their
4823 -- body not, or vice versa.
4825 elsif Comes_From_Source
(Old_Id
)
4826 and then Comes_From_Source
(New_Id
)
4827 and then Is_Ghost_Entity
(Old_Id
) /= Is_Ghost_Entity
(New_Id
)
4829 Conformance_Error
("\ghost modes do not match!");
4834 -- Deal with parameters
4836 -- Note: we use the entity information, rather than going directly
4837 -- to the specification in the tree. This is not only simpler, but
4838 -- absolutely necessary for some cases of conformance tests between
4839 -- operators, where the declaration tree simply does not exist.
4841 Old_Formal
:= First_Formal
(Old_Id
);
4842 New_Formal
:= First_Formal
(New_Id
);
4843 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
4844 if Is_Controlling_Formal
(Old_Formal
)
4845 and then Is_Controlling_Formal
(New_Formal
)
4846 and then Skip_Controlling_Formals
4848 -- The controlling formals will have different types when
4849 -- comparing an interface operation with its match, but both
4850 -- or neither must be access parameters.
4852 if Is_Access_Type
(Etype
(Old_Formal
))
4854 Is_Access_Type
(Etype
(New_Formal
))
4856 goto Skip_Controlling_Formal
;
4859 ("\access parameter does not match!", New_Formal
);
4863 -- Ada 2012: Mode conformance also requires that formal parameters
4864 -- be both aliased, or neither.
4866 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
4867 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
4869 ("\aliased parameter mismatch!", New_Formal
);
4873 if Ctype
= Fully_Conformant
then
4875 -- Names must match. Error message is more accurate if we do
4876 -- this before checking that the types of the formals match.
4878 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
4879 Conformance_Error
("\name& does not match!", New_Formal
);
4881 -- Set error posted flag on new formal as well to stop
4882 -- junk cascaded messages in some cases.
4884 Set_Error_Posted
(New_Formal
);
4888 -- Null exclusion must match
4890 if Null_Exclusion_Present
(Parent
(Old_Formal
))
4892 Null_Exclusion_Present
(Parent
(New_Formal
))
4894 -- Only give error if both come from source. This should be
4895 -- investigated some time, since it should not be needed ???
4897 if Comes_From_Source
(Old_Formal
)
4899 Comes_From_Source
(New_Formal
)
4902 ("\null exclusion for& does not match", New_Formal
);
4904 -- Mark error posted on the new formal to avoid duplicated
4905 -- complaint about types not matching.
4907 Set_Error_Posted
(New_Formal
);
4912 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
4913 -- case occurs whenever a subprogram is being renamed and one of its
4914 -- parameters imposes a null exclusion. For example:
4916 -- type T is null record;
4917 -- type Acc_T is access T;
4918 -- subtype Acc_T_Sub is Acc_T;
4920 -- procedure P (Obj : not null Acc_T_Sub); -- itype
4921 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
4924 Old_Formal_Base
:= Etype
(Old_Formal
);
4925 New_Formal_Base
:= Etype
(New_Formal
);
4928 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
4929 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
4932 Access_Types_Match
:= Ada_Version
>= Ada_2005
4934 -- Ensure that this rule is only applied when New_Id is a
4935 -- renaming of Old_Id.
4937 and then Nkind
(Parent
(Parent
(New_Id
))) =
4938 N_Subprogram_Renaming_Declaration
4939 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
4940 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
4941 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
4943 -- Now handle the allowed access-type case
4945 and then Is_Access_Type
(Old_Formal_Base
)
4946 and then Is_Access_Type
(New_Formal_Base
)
4948 -- The type kinds must match. The only exception occurs with
4949 -- multiple generics of the form:
4952 -- type F is private; type A is private;
4953 -- type F_Ptr is access F; type A_Ptr is access A;
4954 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
4955 -- package F_Pack is ... package A_Pack is
4956 -- package F_Inst is
4957 -- new F_Pack (A, A_Ptr, A_P);
4959 -- When checking for conformance between the parameters of A_P
4960 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
4961 -- because the compiler has transformed A_Ptr into a subtype of
4962 -- F_Ptr. We catch this case in the code below.
4964 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
4966 (Is_Generic_Type
(Old_Formal_Base
)
4967 and then Is_Generic_Type
(New_Formal_Base
)
4968 and then Is_Internal
(New_Formal_Base
)
4969 and then Etype
(Etype
(New_Formal_Base
)) =
4971 and then Directly_Designated_Type
(Old_Formal_Base
) =
4972 Directly_Designated_Type
(New_Formal_Base
)
4973 and then ((Is_Itype
(Old_Formal_Base
)
4974 and then Can_Never_Be_Null
(Old_Formal_Base
))
4976 (Is_Itype
(New_Formal_Base
)
4977 and then Can_Never_Be_Null
(New_Formal_Base
)));
4979 -- Types must always match. In the visible part of an instance,
4980 -- usual overloading rules for dispatching operations apply, and
4981 -- we check base types (not the actual subtypes).
4983 if In_Instance_Visible_Part
4984 and then Is_Dispatching_Operation
(New_Id
)
4986 if not Conforming_Types
4987 (T1
=> Base_Type
(Etype
(Old_Formal
)),
4988 T2
=> Base_Type
(Etype
(New_Formal
)),
4990 Get_Inst
=> Get_Inst
)
4991 and then not Access_Types_Match
4993 Conformance_Error
("\type of & does not match!", New_Formal
);
4997 elsif not Conforming_Types
4998 (T1
=> Old_Formal_Base
,
4999 T2
=> New_Formal_Base
,
5001 Get_Inst
=> Get_Inst
)
5002 and then not Access_Types_Match
5004 -- Don't give error message if old type is Any_Type. This test
5005 -- avoids some cascaded errors, e.g. in case of a bad spec.
5007 if Errmsg
and then Old_Formal_Base
= Any_Type
then
5010 if Ctype
>= Subtype_Conformant
5012 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
5015 ("\predicate of & does not match!", New_Formal
);
5018 ("\type of & does not match!", New_Formal
);
5025 -- For mode conformance, mode must match
5027 if Ctype
>= Mode_Conformant
then
5028 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
5029 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
5030 or else not Is_Primitive_Wrapper
(New_Id
)
5032 Conformance_Error
("\mode of & does not match!", New_Formal
);
5036 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
5038 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
5040 Error_Msg_PT
(T
, New_Id
);
5043 ("\mode of & does not match!", New_Formal
);
5050 -- Part of mode conformance for access types is having the same
5051 -- constant modifier.
5053 elsif Access_Types_Match
5054 and then Is_Access_Constant
(Old_Formal_Base
) /=
5055 Is_Access_Constant
(New_Formal_Base
)
5058 ("\constant modifier does not match!", New_Formal
);
5063 if Ctype
>= Subtype_Conformant
then
5065 -- Ada 2005 (AI-231): In case of anonymous access types check
5066 -- the null-exclusion and access-to-constant attributes must
5067 -- match. For null exclusion, we test the types rather than the
5068 -- formals themselves, since the attribute is only set reliably
5069 -- on the formals in the Ada 95 case, and we exclude the case
5070 -- where Old_Formal is marked as controlling, to avoid errors
5071 -- when matching completing bodies with dispatching declarations
5072 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
5074 if Ada_Version
>= Ada_2005
5075 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
5076 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
5078 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
5079 Can_Never_Be_Null
(Etype
(New_Formal
))
5081 not Is_Controlling_Formal
(Old_Formal
))
5083 Is_Access_Constant
(Etype
(Old_Formal
)) /=
5084 Is_Access_Constant
(Etype
(New_Formal
)))
5086 -- Do not complain if error already posted on New_Formal. This
5087 -- avoids some redundant error messages.
5089 and then not Error_Posted
(New_Formal
)
5091 -- It is allowed to omit the null-exclusion in case of stream
5092 -- attribute subprograms. We recognize stream subprograms
5093 -- through their TSS-generated suffix.
5096 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
5099 if TSS_Name
/= TSS_Stream_Read
5100 and then TSS_Name
/= TSS_Stream_Write
5101 and then TSS_Name
/= TSS_Stream_Input
5102 and then TSS_Name
/= TSS_Stream_Output
5104 -- Here we have a definite conformance error. It is worth
5105 -- special casing the error message for the case of a
5106 -- controlling formal (which excludes null).
5108 if Is_Controlling_Formal
(New_Formal
) then
5109 Error_Msg_Node_2
:= Scope
(New_Formal
);
5111 ("\controlling formal & of & excludes null, "
5112 & "declaration must exclude null as well",
5115 -- Normal case (couldn't we give more detail here???)
5119 ("\type of & does not match!", New_Formal
);
5128 -- Full conformance checks
5130 if Ctype
= Fully_Conformant
then
5132 -- We have checked already that names match
5134 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
5136 -- Check default expressions for in parameters
5139 NewD
: constant Boolean :=
5140 Present
(Default_Value
(New_Formal
));
5141 OldD
: constant Boolean :=
5142 Present
(Default_Value
(Old_Formal
));
5144 if NewD
or OldD
then
5146 -- The old default value has been analyzed because the
5147 -- current full declaration will have frozen everything
5148 -- before. The new default value has not been analyzed,
5149 -- so analyze it now before we check for conformance.
5152 Push_Scope
(New_Id
);
5153 Preanalyze_Spec_Expression
5154 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5158 if not (NewD
and OldD
)
5159 or else not Fully_Conformant_Expressions
5160 (Default_Value
(Old_Formal
),
5161 Default_Value
(New_Formal
))
5164 ("\default expression for & does not match!",
5173 -- A couple of special checks for Ada 83 mode. These checks are
5174 -- skipped if either entity is an operator in package Standard,
5175 -- or if either old or new instance is not from the source program.
5177 if Ada_Version
= Ada_83
5178 and then Sloc
(Old_Id
) > Standard_Location
5179 and then Sloc
(New_Id
) > Standard_Location
5180 and then Comes_From_Source
(Old_Id
)
5181 and then Comes_From_Source
(New_Id
)
5184 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5185 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5188 -- Explicit IN must be present or absent in both cases. This
5189 -- test is required only in the full conformance case.
5191 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5192 and then Ctype
= Fully_Conformant
5195 ("\(Ada 83) IN must appear in both declarations",
5200 -- Grouping (use of comma in param lists) must be the same
5201 -- This is where we catch a misconformance like:
5204 -- A : Integer; B : Integer
5206 -- which are represented identically in the tree except
5207 -- for the setting of the flags More_Ids and Prev_Ids.
5209 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5210 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5213 ("\grouping of & does not match!", New_Formal
);
5219 -- This label is required when skipping controlling formals
5221 <<Skip_Controlling_Formal
>>
5223 Next_Formal
(Old_Formal
);
5224 Next_Formal
(New_Formal
);
5227 if Present
(Old_Formal
) then
5228 Conformance_Error
("\too few parameters!");
5231 elsif Present
(New_Formal
) then
5232 Conformance_Error
("\too many parameters!", New_Formal
);
5235 end Check_Conformance
;
5237 -----------------------
5238 -- Check_Conventions --
5239 -----------------------
5241 procedure Check_Conventions
(Typ
: Entity_Id
) is
5242 Ifaces_List
: Elist_Id
;
5244 procedure Check_Convention
(Op
: Entity_Id
);
5245 -- Verify that the convention of inherited dispatching operation Op is
5246 -- consistent among all subprograms it overrides. In order to minimize
5247 -- the search, Search_From is utilized to designate a specific point in
5248 -- the list rather than iterating over the whole list once more.
5250 ----------------------
5251 -- Check_Convention --
5252 ----------------------
5254 procedure Check_Convention
(Op
: Entity_Id
) is
5255 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5256 Iface_Conv
: Convention_Id
;
5257 Iface_Elmt
: Elmt_Id
;
5258 Iface_Prim_Elmt
: Elmt_Id
;
5259 Iface_Prim
: Entity_Id
;
5262 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5263 while Present
(Iface_Elmt
) loop
5265 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5266 while Present
(Iface_Prim_Elmt
) loop
5267 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5268 Iface_Conv
:= Convention
(Iface_Prim
);
5270 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5271 and then Iface_Conv
/= Op_Conv
5274 ("inconsistent conventions in primitive operations", Typ
);
5276 Error_Msg_Name_1
:= Chars
(Op
);
5277 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5278 Error_Msg_Sloc
:= Sloc
(Op
);
5280 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5281 if not Present
(Overridden_Operation
(Op
)) then
5282 Error_Msg_N
("\\primitive % defined #", Typ
);
5285 ("\\overriding operation % with "
5286 & "convention % defined #", Typ
);
5289 else pragma Assert
(Present
(Alias
(Op
)));
5290 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5291 Error_Msg_N
("\\inherited operation % with "
5292 & "convention % defined #", Typ
);
5295 Error_Msg_Name_1
:= Chars
(Op
);
5296 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5297 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5298 Error_Msg_N
("\\overridden operation % with "
5299 & "convention % defined #", Typ
);
5301 -- Avoid cascading errors
5306 Next_Elmt
(Iface_Prim_Elmt
);
5309 Next_Elmt
(Iface_Elmt
);
5311 end Check_Convention
;
5315 Prim_Op
: Entity_Id
;
5316 Prim_Op_Elmt
: Elmt_Id
;
5318 -- Start of processing for Check_Conventions
5321 if not Has_Interfaces
(Typ
) then
5325 Collect_Interfaces
(Typ
, Ifaces_List
);
5327 -- The algorithm checks every overriding dispatching operation against
5328 -- all the corresponding overridden dispatching operations, detecting
5329 -- differences in conventions.
5331 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5332 while Present
(Prim_Op_Elmt
) loop
5333 Prim_Op
:= Node
(Prim_Op_Elmt
);
5335 -- A small optimization: skip the predefined dispatching operations
5336 -- since they always have the same convention.
5338 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5339 Check_Convention
(Prim_Op
);
5342 Next_Elmt
(Prim_Op_Elmt
);
5344 end Check_Conventions
;
5346 ------------------------------
5347 -- Check_Delayed_Subprogram --
5348 ------------------------------
5350 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5353 procedure Possible_Freeze
(T
: Entity_Id
);
5354 -- T is the type of either a formal parameter or of the return type.
5355 -- If T is not yet frozen and needs a delayed freeze, then the
5356 -- subprogram itself must be delayed. If T is the limited view of an
5357 -- incomplete type the subprogram must be frozen as well, because
5358 -- T may depend on local types that have not been frozen yet.
5360 ---------------------
5361 -- Possible_Freeze --
5362 ---------------------
5364 procedure Possible_Freeze
(T
: Entity_Id
) is
5366 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5367 Set_Has_Delayed_Freeze
(Designator
);
5369 elsif Is_Access_Type
(T
)
5370 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5371 and then not Is_Frozen
(Designated_Type
(T
))
5373 Set_Has_Delayed_Freeze
(Designator
);
5375 elsif Ekind
(T
) = E_Incomplete_Type
5376 and then From_Limited_With
(T
)
5378 Set_Has_Delayed_Freeze
(Designator
);
5380 -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile
5381 -- of a subprogram or entry declaration.
5383 elsif Ekind
(T
) = E_Incomplete_Type
5384 and then Ada_Version
>= Ada_2012
5386 Set_Has_Delayed_Freeze
(Designator
);
5389 end Possible_Freeze
;
5391 -- Start of processing for Check_Delayed_Subprogram
5394 -- All subprograms, including abstract subprograms, may need a freeze
5395 -- node if some formal type or the return type needs one.
5397 Possible_Freeze
(Etype
(Designator
));
5398 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5400 -- Need delayed freeze if any of the formal types themselves need
5401 -- a delayed freeze and are not yet frozen.
5403 F
:= First_Formal
(Designator
);
5404 while Present
(F
) loop
5405 Possible_Freeze
(Etype
(F
));
5406 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5410 -- Mark functions that return by reference. Note that it cannot be
5411 -- done for delayed_freeze subprograms because the underlying
5412 -- returned type may not be known yet (for private types)
5414 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5416 Typ
: constant Entity_Id
:= Etype
(Designator
);
5417 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5419 if Is_Limited_View
(Typ
) then
5420 Set_Returns_By_Ref
(Designator
);
5421 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5422 Set_Returns_By_Ref
(Designator
);
5426 end Check_Delayed_Subprogram
;
5428 ------------------------------------
5429 -- Check_Discriminant_Conformance --
5430 ------------------------------------
5432 procedure Check_Discriminant_Conformance
5437 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5438 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5439 New_Discr_Id
: Entity_Id
;
5440 New_Discr_Type
: Entity_Id
;
5442 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5443 -- Post error message for conformance error on given node. Two messages
5444 -- are output. The first points to the previous declaration with a
5445 -- general "no conformance" message. The second is the detailed reason,
5446 -- supplied as Msg. The parameter N provide information for a possible
5447 -- & insertion in the message.
5449 -----------------------
5450 -- Conformance_Error --
5451 -----------------------
5453 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5455 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5456 Error_Msg_N
-- CODEFIX
5457 ("not fully conformant with declaration#!", N
);
5458 Error_Msg_NE
(Msg
, N
, N
);
5459 end Conformance_Error
;
5461 -- Start of processing for Check_Discriminant_Conformance
5464 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5465 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5467 -- The subtype mark of the discriminant on the full type has not
5468 -- been analyzed so we do it here. For an access discriminant a new
5471 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5473 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5476 Analyze
(Discriminant_Type
(New_Discr
));
5477 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5479 -- Ada 2005: if the discriminant definition carries a null
5480 -- exclusion, create an itype to check properly for consistency
5481 -- with partial declaration.
5483 if Is_Access_Type
(New_Discr_Type
)
5484 and then Null_Exclusion_Present
(New_Discr
)
5487 Create_Null_Excluding_Itype
5488 (T
=> New_Discr_Type
,
5489 Related_Nod
=> New_Discr
,
5490 Scope_Id
=> Current_Scope
);
5494 if not Conforming_Types
5495 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5497 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5500 -- Treat the new discriminant as an occurrence of the old one,
5501 -- for navigation purposes, and fill in some semantic
5502 -- information, for completeness.
5504 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5505 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5506 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5511 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5512 Conformance_Error
("name & does not match!", New_Discr_Id
);
5516 -- Default expressions must match
5519 NewD
: constant Boolean :=
5520 Present
(Expression
(New_Discr
));
5521 OldD
: constant Boolean :=
5522 Present
(Expression
(Parent
(Old_Discr
)));
5525 if NewD
or OldD
then
5527 -- The old default value has been analyzed and expanded,
5528 -- because the current full declaration will have frozen
5529 -- everything before. The new default values have not been
5530 -- expanded, so expand now to check conformance.
5533 Preanalyze_Spec_Expression
5534 (Expression
(New_Discr
), New_Discr_Type
);
5537 if not (NewD
and OldD
)
5538 or else not Fully_Conformant_Expressions
5539 (Expression
(Parent
(Old_Discr
)),
5540 Expression
(New_Discr
))
5544 ("default expression for & does not match!",
5551 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
5553 if Ada_Version
= Ada_83
then
5555 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
5558 -- Grouping (use of comma in param lists) must be the same
5559 -- This is where we catch a misconformance like:
5562 -- A : Integer; B : Integer
5564 -- which are represented identically in the tree except
5565 -- for the setting of the flags More_Ids and Prev_Ids.
5567 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
5568 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
5571 ("grouping of & does not match!", New_Discr_Id
);
5577 Next_Discriminant
(Old_Discr
);
5581 if Present
(Old_Discr
) then
5582 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
5585 elsif Present
(New_Discr
) then
5587 ("too many discriminants!", Defining_Identifier
(New_Discr
));
5590 end Check_Discriminant_Conformance
;
5592 ----------------------------
5593 -- Check_Fully_Conformant --
5594 ----------------------------
5596 procedure Check_Fully_Conformant
5597 (New_Id
: Entity_Id
;
5599 Err_Loc
: Node_Id
:= Empty
)
5602 pragma Warnings
(Off
, Result
);
5605 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
5606 end Check_Fully_Conformant
;
5608 ---------------------------
5609 -- Check_Mode_Conformant --
5610 ---------------------------
5612 procedure Check_Mode_Conformant
5613 (New_Id
: Entity_Id
;
5615 Err_Loc
: Node_Id
:= Empty
;
5616 Get_Inst
: Boolean := False)
5619 pragma Warnings
(Off
, Result
);
5622 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
5623 end Check_Mode_Conformant
;
5625 --------------------------------
5626 -- Check_Overriding_Indicator --
5627 --------------------------------
5629 procedure Check_Overriding_Indicator
5631 Overridden_Subp
: Entity_Id
;
5632 Is_Primitive
: Boolean)
5638 -- No overriding indicator for literals
5640 if Ekind
(Subp
) = E_Enumeration_Literal
then
5643 elsif Ekind
(Subp
) = E_Entry
then
5644 Decl
:= Parent
(Subp
);
5646 -- No point in analyzing a malformed operator
5648 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
5649 and then Error_Posted
(Subp
)
5654 Decl
:= Unit_Declaration_Node
(Subp
);
5657 if Nkind_In
(Decl
, N_Subprogram_Body
,
5658 N_Subprogram_Body_Stub
,
5659 N_Subprogram_Declaration
,
5660 N_Abstract_Subprogram_Declaration
,
5661 N_Subprogram_Renaming_Declaration
)
5663 Spec
:= Specification
(Decl
);
5665 elsif Nkind
(Decl
) = N_Entry_Declaration
then
5672 -- The overriding operation is type conformant with the overridden one,
5673 -- but the names of the formals are not required to match. If the names
5674 -- appear permuted in the overriding operation, this is a possible
5675 -- source of confusion that is worth diagnosing. Controlling formals
5676 -- often carry names that reflect the type, and it is not worthwhile
5677 -- requiring that their names match.
5679 if Present
(Overridden_Subp
)
5680 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
5687 Form1
:= First_Formal
(Subp
);
5688 Form2
:= First_Formal
(Overridden_Subp
);
5690 -- If the overriding operation is a synchronized operation, skip
5691 -- the first parameter of the overridden operation, which is
5692 -- implicit in the new one. If the operation is declared in the
5693 -- body it is not primitive and all formals must match.
5695 if Is_Concurrent_Type
(Scope
(Subp
))
5696 and then Is_Tagged_Type
(Scope
(Subp
))
5697 and then not Has_Completion
(Scope
(Subp
))
5699 Form2
:= Next_Formal
(Form2
);
5702 if Present
(Form1
) then
5703 Form1
:= Next_Formal
(Form1
);
5704 Form2
:= Next_Formal
(Form2
);
5707 while Present
(Form1
) loop
5708 if not Is_Controlling_Formal
(Form1
)
5709 and then Present
(Next_Formal
(Form2
))
5710 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
5712 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
5713 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
5715 ("& does not match corresponding formal of&#",
5720 Next_Formal
(Form1
);
5721 Next_Formal
(Form2
);
5726 -- If there is an overridden subprogram, then check that there is no
5727 -- "not overriding" indicator, and mark the subprogram as overriding.
5728 -- This is not done if the overridden subprogram is marked as hidden,
5729 -- which can occur for the case of inherited controlled operations
5730 -- (see Derive_Subprogram), unless the inherited subprogram's parent
5731 -- subprogram is not itself hidden. (Note: This condition could probably
5732 -- be simplified, leaving out the testing for the specific controlled
5733 -- cases, but it seems safer and clearer this way, and echoes similar
5734 -- special-case tests of this kind in other places.)
5736 if Present
(Overridden_Subp
)
5737 and then (not Is_Hidden
(Overridden_Subp
)
5739 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
5742 and then Present
(Alias
(Overridden_Subp
))
5743 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
5745 if Must_Not_Override
(Spec
) then
5746 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
5748 if Ekind
(Subp
) = E_Entry
then
5750 ("entry & overrides inherited operation #", Spec
, Subp
);
5753 ("subprogram & overrides inherited operation #", Spec
, Subp
);
5756 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
5757 -- as an extension of Root_Controlled, and thus has a useless Adjust
5758 -- operation. This operation should not be inherited by other limited
5759 -- controlled types. An explicit Adjust for them is not overriding.
5761 elsif Must_Override
(Spec
)
5762 and then Chars
(Overridden_Subp
) = Name_Adjust
5763 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
5764 and then Present
(Alias
(Overridden_Subp
))
5766 Is_Predefined_File_Name
5767 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))))
5769 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5771 elsif Is_Subprogram
(Subp
) then
5772 if Is_Init_Proc
(Subp
) then
5775 elsif No
(Overridden_Operation
(Subp
)) then
5777 -- For entities generated by Derive_Subprograms the overridden
5778 -- operation is the inherited primitive (which is available
5779 -- through the attribute alias)
5781 if (Is_Dispatching_Operation
(Subp
)
5782 or else Is_Dispatching_Operation
(Overridden_Subp
))
5783 and then not Comes_From_Source
(Overridden_Subp
)
5784 and then Find_Dispatching_Type
(Overridden_Subp
) =
5785 Find_Dispatching_Type
(Subp
)
5786 and then Present
(Alias
(Overridden_Subp
))
5787 and then Comes_From_Source
(Alias
(Overridden_Subp
))
5789 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
5790 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
5793 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
5794 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
5799 -- If primitive flag is set or this is a protected operation, then
5800 -- the operation is overriding at the point of its declaration, so
5801 -- warn if necessary. Otherwise it may have been declared before the
5802 -- operation it overrides and no check is required.
5805 and then not Must_Override
(Spec
)
5806 and then (Is_Primitive
5807 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
5809 Style
.Missing_Overriding
(Decl
, Subp
);
5812 -- If Subp is an operator, it may override a predefined operation, if
5813 -- it is defined in the same scope as the type to which it applies.
5814 -- In that case Overridden_Subp is empty because of our implicit
5815 -- representation for predefined operators. We have to check whether the
5816 -- signature of Subp matches that of a predefined operator. Note that
5817 -- first argument provides the name of the operator, and the second
5818 -- argument the signature that may match that of a standard operation.
5819 -- If the indicator is overriding, then the operator must match a
5820 -- predefined signature, because we know already that there is no
5821 -- explicit overridden operation.
5823 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
5824 if Must_Not_Override
(Spec
) then
5826 -- If this is not a primitive or a protected subprogram, then
5827 -- "not overriding" is illegal.
5830 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5832 Error_Msg_N
("overriding indicator only allowed "
5833 & "if subprogram is primitive", Subp
);
5835 elsif Can_Override_Operator
(Subp
) then
5837 ("subprogram& overrides predefined operator ", Spec
, Subp
);
5840 elsif Must_Override
(Spec
) then
5841 if No
(Overridden_Operation
(Subp
))
5842 and then not Can_Override_Operator
(Subp
)
5844 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5847 elsif not Error_Posted
(Subp
)
5848 and then Style_Check
5849 and then Can_Override_Operator
(Subp
)
5851 not Is_Predefined_File_Name
5852 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
5854 -- If style checks are enabled, indicate that the indicator is
5855 -- missing. However, at the point of declaration, the type of
5856 -- which this is a primitive operation may be private, in which
5857 -- case the indicator would be premature.
5859 if Has_Private_Declaration
(Etype
(Subp
))
5860 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
5864 Style
.Missing_Overriding
(Decl
, Subp
);
5868 elsif Must_Override
(Spec
) then
5869 if Ekind
(Subp
) = E_Entry
then
5870 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
5872 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5875 -- If the operation is marked "not overriding" and it's not primitive
5876 -- then an error is issued, unless this is an operation of a task or
5877 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
5878 -- has been specified have already been checked above.
5880 elsif Must_Not_Override
(Spec
)
5881 and then not Is_Primitive
5882 and then Ekind
(Subp
) /= E_Entry
5883 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5886 ("overriding indicator only allowed if subprogram is primitive",
5890 end Check_Overriding_Indicator
;
5896 -- Note: this procedure needs to know far too much about how the expander
5897 -- messes with exceptions. The use of the flag Exception_Junk and the
5898 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
5899 -- works, but is not very clean. It would be better if the expansion
5900 -- routines would leave Original_Node working nicely, and we could use
5901 -- Original_Node here to ignore all the peculiar expander messing ???
5903 procedure Check_Returns
5907 Proc
: Entity_Id
:= Empty
)
5911 procedure Check_Statement_Sequence
(L
: List_Id
);
5912 -- Internal recursive procedure to check a list of statements for proper
5913 -- termination by a return statement (or a transfer of control or a
5914 -- compound statement that is itself internally properly terminated).
5916 ------------------------------
5917 -- Check_Statement_Sequence --
5918 ------------------------------
5920 procedure Check_Statement_Sequence
(L
: List_Id
) is
5925 function Assert_False
return Boolean;
5926 -- Returns True if Last_Stm is a pragma Assert (False) that has been
5927 -- rewritten as a null statement when assertions are off. The assert
5928 -- is not active, but it is still enough to kill the warning.
5934 function Assert_False
return Boolean is
5935 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
5938 if Nkind
(Orig
) = N_Pragma
5939 and then Pragma_Name
(Orig
) = Name_Assert
5940 and then not Error_Posted
(Orig
)
5943 Arg
: constant Node_Id
:=
5944 First
(Pragma_Argument_Associations
(Orig
));
5945 Exp
: constant Node_Id
:= Expression
(Arg
);
5947 return Nkind
(Exp
) = N_Identifier
5948 and then Chars
(Exp
) = Name_False
;
5958 Raise_Exception_Call
: Boolean;
5959 -- Set True if statement sequence terminated by Raise_Exception call
5960 -- or a Reraise_Occurrence call.
5962 -- Start of processing for Check_Statement_Sequence
5965 Raise_Exception_Call
:= False;
5967 -- Get last real statement
5969 Last_Stm
:= Last
(L
);
5971 -- Deal with digging out exception handler statement sequences that
5972 -- have been transformed by the local raise to goto optimization.
5973 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
5974 -- optimization has occurred, we are looking at something like:
5977 -- original stmts in block
5981 -- goto L1; | omitted if No_Exception_Propagation
5986 -- goto L3; -- skip handler when exception not raised
5988 -- <<L1>> -- target label for local exception
6002 -- and what we have to do is to dig out the estmts1 and estmts2
6003 -- sequences (which were the original sequences of statements in
6004 -- the exception handlers) and check them.
6006 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
6011 exit when Nkind
(Stm
) /= N_Block_Statement
;
6012 exit when not Exception_Junk
(Stm
);
6015 exit when Nkind
(Stm
) /= N_Label
;
6016 exit when not Exception_Junk
(Stm
);
6017 Check_Statement_Sequence
6018 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
6023 exit when Nkind
(Stm
) /= N_Goto_Statement
;
6024 exit when not Exception_Junk
(Stm
);
6028 -- Don't count pragmas
6030 while Nkind
(Last_Stm
) = N_Pragma
6032 -- Don't count call to SS_Release (can happen after Raise_Exception)
6035 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
6037 Nkind
(Name
(Last_Stm
)) = N_Identifier
6039 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
6041 -- Don't count exception junk
6044 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
6046 N_Object_Declaration
)
6047 and then Exception_Junk
(Last_Stm
))
6048 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
6049 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
6051 -- Inserted code, such as finalization calls, is irrelevant: we only
6052 -- need to check original source.
6054 or else Is_Rewrite_Insertion
(Last_Stm
)
6059 -- Here we have the "real" last statement
6061 Kind
:= Nkind
(Last_Stm
);
6063 -- Transfer of control, OK. Note that in the No_Return procedure
6064 -- case, we already diagnosed any explicit return statements, so
6065 -- we can treat them as OK in this context.
6067 if Is_Transfer
(Last_Stm
) then
6070 -- Check cases of explicit non-indirect procedure calls
6072 elsif Kind
= N_Procedure_Call_Statement
6073 and then Is_Entity_Name
(Name
(Last_Stm
))
6075 -- Check call to Raise_Exception procedure which is treated
6076 -- specially, as is a call to Reraise_Occurrence.
6078 -- We suppress the warning in these cases since it is likely that
6079 -- the programmer really does not expect to deal with the case
6080 -- of Null_Occurrence, and thus would find a warning about a
6081 -- missing return curious, and raising Program_Error does not
6082 -- seem such a bad behavior if this does occur.
6084 -- Note that in the Ada 2005 case for Raise_Exception, the actual
6085 -- behavior will be to raise Constraint_Error (see AI-329).
6087 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
6089 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
6091 Raise_Exception_Call
:= True;
6093 -- For Raise_Exception call, test first argument, if it is
6094 -- an attribute reference for a 'Identity call, then we know
6095 -- that the call cannot possibly return.
6098 Arg
: constant Node_Id
:=
6099 Original_Node
(First_Actual
(Last_Stm
));
6101 if Nkind
(Arg
) = N_Attribute_Reference
6102 and then Attribute_Name
(Arg
) = Name_Identity
6109 -- If statement, need to look inside if there is an else and check
6110 -- each constituent statement sequence for proper termination.
6112 elsif Kind
= N_If_Statement
6113 and then Present
(Else_Statements
(Last_Stm
))
6115 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
6116 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6118 if Present
(Elsif_Parts
(Last_Stm
)) then
6120 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
6123 while Present
(Elsif_Part
) loop
6124 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
6132 -- Case statement, check each case for proper termination
6134 elsif Kind
= N_Case_Statement
then
6138 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6139 while Present
(Case_Alt
) loop
6140 Check_Statement_Sequence
(Statements
(Case_Alt
));
6141 Next_Non_Pragma
(Case_Alt
);
6147 -- Block statement, check its handled sequence of statements
6149 elsif Kind
= N_Block_Statement
then
6155 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6164 -- Loop statement. If there is an iteration scheme, we can definitely
6165 -- fall out of the loop. Similarly if there is an exit statement, we
6166 -- can fall out. In either case we need a following return.
6168 elsif Kind
= N_Loop_Statement
then
6169 if Present
(Iteration_Scheme
(Last_Stm
))
6170 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6174 -- A loop with no exit statement or iteration scheme is either
6175 -- an infinite loop, or it has some other exit (raise/return).
6176 -- In either case, no warning is required.
6182 -- Timed entry call, check entry call and delay alternatives
6184 -- Note: in expanded code, the timed entry call has been converted
6185 -- to a set of expanded statements on which the check will work
6186 -- correctly in any case.
6188 elsif Kind
= N_Timed_Entry_Call
then
6190 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6191 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6194 -- If statement sequence of entry call alternative is missing,
6195 -- then we can definitely fall through, and we post the error
6196 -- message on the entry call alternative itself.
6198 if No
(Statements
(ECA
)) then
6201 -- If statement sequence of delay alternative is missing, then
6202 -- we can definitely fall through, and we post the error
6203 -- message on the delay alternative itself.
6205 -- Note: if both ECA and DCA are missing the return, then we
6206 -- post only one message, should be enough to fix the bugs.
6207 -- If not we will get a message next time on the DCA when the
6210 elsif No
(Statements
(DCA
)) then
6213 -- Else check both statement sequences
6216 Check_Statement_Sequence
(Statements
(ECA
));
6217 Check_Statement_Sequence
(Statements
(DCA
));
6222 -- Conditional entry call, check entry call and else part
6224 -- Note: in expanded code, the conditional entry call has been
6225 -- converted to a set of expanded statements on which the check
6226 -- will work correctly in any case.
6228 elsif Kind
= N_Conditional_Entry_Call
then
6230 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6233 -- If statement sequence of entry call alternative is missing,
6234 -- then we can definitely fall through, and we post the error
6235 -- message on the entry call alternative itself.
6237 if No
(Statements
(ECA
)) then
6240 -- Else check statement sequence and else part
6243 Check_Statement_Sequence
(Statements
(ECA
));
6244 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6250 -- If we fall through, issue appropriate message
6254 -- Kill warning if last statement is a raise exception call,
6255 -- or a pragma Assert (False). Note that with assertions enabled,
6256 -- such a pragma has been converted into a raise exception call
6257 -- already, so the Assert_False is for the assertions off case.
6259 if not Raise_Exception_Call
and then not Assert_False
then
6261 -- In GNATprove mode, it is an error to have a missing return
6263 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6265 -- Issue error message or warning
6268 ("RETURN statement missing following this statement<<!",
6271 ("\Program_Error ]<<!", Last_Stm
);
6274 -- Note: we set Err even though we have not issued a warning
6275 -- because we still have a case of a missing return. This is
6276 -- an extremely marginal case, probably will never be noticed
6277 -- but we might as well get it right.
6281 -- Otherwise we have the case of a procedure marked No_Return
6284 if not Raise_Exception_Call
then
6285 if GNATprove_Mode
then
6287 ("implied return after this statement "
6288 & "would have raised Program_Error", Last_Stm
);
6291 ("implied return after this statement "
6292 & "will raise Program_Error??", Last_Stm
);
6295 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6297 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6301 RE
: constant Node_Id
:=
6302 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6303 Reason
=> PE_Implicit_Return
);
6305 Insert_After
(Last_Stm
, RE
);
6309 end Check_Statement_Sequence
;
6311 -- Start of processing for Check_Returns
6315 Check_Statement_Sequence
(Statements
(HSS
));
6317 if Present
(Exception_Handlers
(HSS
)) then
6318 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6319 while Present
(Handler
) loop
6320 Check_Statement_Sequence
(Statements
(Handler
));
6321 Next_Non_Pragma
(Handler
);
6326 ----------------------------
6327 -- Check_Subprogram_Order --
6328 ----------------------------
6330 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6332 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6333 -- This is used to check if S1 > S2 in the sense required by this test,
6334 -- for example nameab < namec, but name2 < name10.
6336 -----------------------------
6337 -- Subprogram_Name_Greater --
6338 -----------------------------
6340 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6345 -- Deal with special case where names are identical except for a
6346 -- numerical suffix. These are handled specially, taking the numeric
6347 -- ordering from the suffix into account.
6350 while S1
(L1
) in '0' .. '9' loop
6355 while S2
(L2
) in '0' .. '9' loop
6359 -- If non-numeric parts non-equal, do straight compare
6361 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6364 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6365 -- that a missing suffix is treated as numeric zero in this test.
6369 while L1
< S1
'Last loop
6371 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6375 while L2
< S2
'Last loop
6377 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6382 end Subprogram_Name_Greater
;
6384 -- Start of processing for Check_Subprogram_Order
6387 -- Check body in alpha order if this is option
6390 and then Style_Check_Order_Subprograms
6391 and then Nkind
(N
) = N_Subprogram_Body
6392 and then Comes_From_Source
(N
)
6393 and then In_Extended_Main_Source_Unit
(N
)
6397 renames Scope_Stack
.Table
6398 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6400 Body_Id
: constant Entity_Id
:=
6401 Defining_Entity
(Specification
(N
));
6404 Get_Decoded_Name_String
(Chars
(Body_Id
));
6407 if Subprogram_Name_Greater
6408 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6410 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6416 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6419 end Check_Subprogram_Order;
6421 ------------------------------
6422 -- Check_Subtype_Conformant --
6423 ------------------------------
6425 procedure Check_Subtype_Conformant
6426 (New_Id : Entity_Id;
6428 Err_Loc : Node_Id := Empty;
6429 Skip_Controlling_Formals : Boolean := False;
6430 Get_Inst : Boolean := False)
6433 pragma Warnings (Off, Result);
6436 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6437 Skip_Controlling_Formals => Skip_Controlling_Formals,
6438 Get_Inst => Get_Inst);
6439 end Check_Subtype_Conformant;
6441 ---------------------------
6442 -- Check_Type_Conformant --
6443 ---------------------------
6445 procedure Check_Type_Conformant
6446 (New_Id : Entity_Id;
6448 Err_Loc : Node_Id := Empty)
6451 pragma Warnings (Off, Result);
6454 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
6455 end Check_Type_Conformant;
6457 ---------------------------
6458 -- Can_Override_Operator --
6459 ---------------------------
6461 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
6465 if Nkind (Subp) /= N_Defining_Operator_Symbol then
6469 Typ := Base_Type (Etype (First_Formal (Subp)));
6471 -- Check explicitly that the operation is a primitive of the type
6473 return Operator_Matches_Spec (Subp, Subp)
6474 and then not Is_Generic_Type (Typ)
6475 and then Scope (Subp) = Scope (Typ)
6476 and then not Is_Class_Wide_Type (Typ);
6478 end Can_Override_Operator;
6480 ----------------------
6481 -- Conforming_Types --
6482 ----------------------
6484 function Conforming_Types
6487 Ctype : Conformance_Type;
6488 Get_Inst : Boolean := False) return Boolean
6490 Type_1 : Entity_Id := T1;
6491 Type_2 : Entity_Id := T2;
6492 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
6494 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
6495 -- If neither T1 nor T2 are generic actual types, or if they are in
6496 -- different scopes (e.g. parent and child instances), then verify that
6497 -- the base types are equal. Otherwise T1 and T2 must be on the same
6498 -- subtype chain. The whole purpose of this procedure is to prevent
6499 -- spurious ambiguities in an instantiation that may arise if two
6500 -- distinct generic types are instantiated with the same actual.
6502 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
6503 -- An access parameter can designate an incomplete type. If the
6504 -- incomplete type is the limited view of a type from a limited_
6505 -- with_clause, check whether the non-limited view is available. If
6506 -- it is a (non-limited) incomplete type, get the full view.
6508 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
6509 -- Returns True if and only if either T1 denotes a limited view of T2
6510 -- or T2 denotes a limited view of T1. This can arise when the limited
6511 -- with view of a type is used in a subprogram declaration and the
6512 -- subprogram body is in the scope of a regular with clause for the
6513 -- same unit. In such a case, the two type entities can be considered
6514 -- identical for purposes of conformance checking.
6516 ----------------------
6517 -- Base_Types_Match --
6518 ----------------------
6520 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
6521 BT1 : constant Entity_Id := Base_Type (T1);
6522 BT2 : constant Entity_Id := Base_Type (T2);
6528 elsif BT1 = BT2 then
6530 -- The following is too permissive. A more precise test should
6531 -- check that the generic actual is an ancestor subtype of the
6534 -- See code in Find_Corresponding_Spec that applies an additional
6535 -- filter to handle accidental amiguities in instances.
6537 return not Is_Generic_Actual_Type (T1)
6538 or else not Is_Generic_Actual_Type (T2)
6539 or else Scope (T1) /= Scope (T2);
6541 -- If T2 is a generic actual type it is declared as the subtype of
6542 -- the actual. If that actual is itself a subtype we need to use its
6543 -- own base type to check for compatibility.
6545 elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then
6548 elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then
6554 end Base_Types_Match;
6556 --------------------------
6557 -- Find_Designated_Type --
6558 --------------------------
6560 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
6564 Desig := Directly_Designated_Type (T);
6566 if Ekind (Desig) = E_Incomplete_Type then
6568 -- If regular incomplete type, get full view if available
6570 if Present (Full_View (Desig)) then
6571 Desig := Full_View (Desig);
6573 -- If limited view of a type, get non-limited view if available,
6574 -- and check again for a regular incomplete type.
6576 elsif Present (Non_Limited_View (Desig)) then
6577 Desig := Get_Full_View (Non_Limited_View (Desig));
6582 end Find_Designated_Type;
6584 -------------------------------
6585 -- Matches_Limited_With_View --
6586 -------------------------------
6588 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
6590 -- In some cases a type imported through a limited_with clause, and
6591 -- its nonlimited view are both visible, for example in an anonymous
6592 -- access-to-class-wide type in a formal. Both entities designate the
6595 if From_Limited_With (T1) and then T2 = Available_View (T1) then
6598 elsif From_Limited_With (T2) and then T1 = Available_View (T2) then
6601 elsif From_Limited_With (T1)
6602 and then From_Limited_With (T2)
6603 and then Available_View (T1) = Available_View (T2)
6610 end Matches_Limited_With_View;
6612 -- Start of processing for Conforming_Types
6615 -- The context is an instance association for a formal access-to-
6616 -- subprogram type; the formal parameter types require mapping because
6617 -- they may denote other formal parameters of the generic unit.
6620 Type_1 := Get_Instance_Of (T1);
6621 Type_2 := Get_Instance_Of (T2);
6624 -- If one of the types is a view of the other introduced by a limited
6625 -- with clause, treat these as conforming for all purposes.
6627 if Matches_Limited_With_View (T1, T2) then
6630 elsif Base_Types_Match (Type_1, Type_2) then
6631 return Ctype <= Mode_Conformant
6632 or else Subtypes_Statically_Match (Type_1, Type_2);
6634 elsif Is_Incomplete_Or_Private_Type (Type_1)
6635 and then Present (Full_View (Type_1))
6636 and then Base_Types_Match (Full_View (Type_1), Type_2)
6638 return Ctype <= Mode_Conformant
6639 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
6641 elsif Ekind (Type_2) = E_Incomplete_Type
6642 and then Present (Full_View (Type_2))
6643 and then Base_Types_Match (Type_1, Full_View (Type_2))
6645 return Ctype <= Mode_Conformant
6646 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6648 elsif Is_Private_Type (Type_2)
6649 and then In_Instance
6650 and then Present (Full_View (Type_2))
6651 and then Base_Types_Match (Type_1, Full_View (Type_2))
6653 return Ctype <= Mode_Conformant
6654 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6657 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
6658 -- treated recursively because they carry a signature. As far as
6659 -- conformance is concerned, convention plays no role, and either
6660 -- or both could be access to protected subprograms.
6662 Are_Anonymous_Access_To_Subprogram_Types :=
6663 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
6664 E_Anonymous_Access_Protected_Subprogram_Type)
6666 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
6667 E_Anonymous_Access_Protected_Subprogram_Type);
6669 -- Test anonymous access type case. For this case, static subtype
6670 -- matching is required for mode conformance (RM 6.3.1(15)). We check
6671 -- the base types because we may have built internal subtype entities
6672 -- to handle null-excluding types (see Process_Formals).
6674 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
6676 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
6678 -- Ada 2005 (AI-254)
6680 or else Are_Anonymous_Access_To_Subprogram_Types
6683 Desig_1 : Entity_Id;
6684 Desig_2 : Entity_Id;
6687 -- In Ada 2005, access constant indicators must match for
6688 -- subtype conformance.
6690 if Ada_Version >= Ada_2005
6691 and then Ctype >= Subtype_Conformant
6693 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
6698 Desig_1 := Find_Designated_Type (Type_1);
6699 Desig_2 := Find_Designated_Type (Type_2);
6701 -- If the context is an instance association for a formal
6702 -- access-to-subprogram type; formal access parameter designated
6703 -- types require mapping because they may denote other formal
6704 -- parameters of the generic unit.
6707 Desig_1 := Get_Instance_Of (Desig_1);
6708 Desig_2 := Get_Instance_Of (Desig_2);
6711 -- It is possible for a Class_Wide_Type to be introduced for an
6712 -- incomplete type, in which case there is a separate class_ wide
6713 -- type for the full view. The types conform if their Etypes
6714 -- conform, i.e. one may be the full view of the other. This can
6715 -- only happen in the context of an access parameter, other uses
6716 -- of an incomplete Class_Wide_Type are illegal.
6718 if Is_Class_Wide_Type (Desig_1)
6720 Is_Class_Wide_Type (Desig_2)
6724 (Etype (Base_Type (Desig_1)),
6725 Etype (Base_Type (Desig_2)), Ctype);
6727 elsif Are_Anonymous_Access_To_Subprogram_Types then
6728 if Ada_Version < Ada_2005 then
6729 return Ctype = Type_Conformant
6731 Subtypes_Statically_Match (Desig_1, Desig_2);
6733 -- We must check the conformance of the signatures themselves
6737 Conformant : Boolean;
6740 (Desig_1, Desig_2, Ctype, False, Conformant);
6746 return Base_Type (Desig_1) = Base_Type (Desig_2)
6747 and then (Ctype = Type_Conformant
6749 Subtypes_Statically_Match (Desig_1, Desig_2));
6753 -- Otherwise definitely no match
6756 if ((Ekind (Type_1) = E_Anonymous_Access_Type
6757 and then Is_Access_Type (Type_2))
6758 or else (Ekind (Type_2) = E_Anonymous_Access_Type
6759 and then Is_Access_Type (Type_1)))
6762 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
6764 May_Hide_Profile := True;
6769 end Conforming_Types;
6771 --------------------------
6772 -- Create_Extra_Formals --
6773 --------------------------
6775 procedure Create_Extra_Formals (E : Entity_Id) is
6777 First_Extra : Entity_Id := Empty;
6778 Last_Extra : Entity_Id;
6779 Formal_Type : Entity_Id;
6780 P_Formal : Entity_Id := Empty;
6782 function Add_Extra_Formal
6783 (Assoc_Entity : Entity_Id;
6786 Suffix : String) return Entity_Id;
6787 -- Add an extra formal to the current list of formals and extra formals.
6788 -- The extra formal is added to the end of the list of extra formals,
6789 -- and also returned as the result. These formals are always of mode IN.
6790 -- The new formal has the type Typ, is declared in Scope, and its name
6791 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
6792 -- The following suffixes are currently used. They should not be changed
6793 -- without coordinating with CodePeer, which makes use of these to
6794 -- provide better messages.
6796 -- O denotes the Constrained bit.
6797 -- L denotes the accessibility level.
6798 -- BIP_xxx denotes an extra formal for a build-in-place function. See
6799 -- the full list in exp_ch6.BIP_Formal_Kind.
6801 ----------------------
6802 -- Add_Extra_Formal --
6803 ----------------------
6805 function Add_Extra_Formal
6806 (Assoc_Entity : Entity_Id;
6809 Suffix : String) return Entity_Id
6811 EF : constant Entity_Id :=
6812 Make_Defining_Identifier (Sloc (Assoc_Entity),
6813 Chars => New_External_Name (Chars (Assoc_Entity),
6817 -- A little optimization. Never generate an extra formal for the
6818 -- _init operand of an initialization procedure, since it could
6821 if Chars (Formal) = Name_uInit then
6825 Set_Ekind (EF, E_In_Parameter);
6826 Set_Actual_Subtype (EF, Typ);
6827 Set_Etype (EF, Typ);
6828 Set_Scope (EF, Scope);
6829 Set_Mechanism (EF, Default_Mechanism);
6830 Set_Formal_Validity (EF);
6832 if No (First_Extra) then
6834 Set_Extra_Formals (Scope, First_Extra);
6837 if Present (Last_Extra) then
6838 Set_Extra_Formal (Last_Extra, EF);
6844 end Add_Extra_Formal;
6846 -- Start of processing for Create_Extra_Formals
6849 -- We never generate extra formals if expansion is not active because we
6850 -- don't need them unless we are generating code.
6852 if not Expander_Active then
6856 -- No need to generate extra formals in interface thunks whose target
6857 -- primitive has no extra formals.
6859 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
6863 -- If this is a derived subprogram then the subtypes of the parent
6864 -- subprogram's formal parameters will be used to determine the need
6865 -- for extra formals.
6867 if Is_Overloadable (E) and then Present (Alias (E)) then
6868 P_Formal := First_Formal (Alias (E));
6871 Last_Extra := Empty;
6872 Formal := First_Formal (E);
6873 while Present (Formal) loop
6874 Last_Extra := Formal;
6875 Next_Formal (Formal);
6878 -- If Extra_formals were already created, don't do it again. This
6879 -- situation may arise for subprogram types created as part of
6880 -- dispatching calls (see Expand_Dispatching_Call)
6882 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
6886 -- If the subprogram is a predefined dispatching subprogram then don't
6887 -- generate any extra constrained or accessibility level formals. In
6888 -- general we suppress these for internal subprograms (by not calling
6889 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
6890 -- generated stream attributes do get passed through because extra
6891 -- build-in-place formals are needed in some cases (limited 'Input
).
6893 if Is_Predefined_Internal_Operation
(E
) then
6894 goto Test_For_Func_Result_Extras
;
6897 Formal
:= First_Formal
(E
);
6898 while Present
(Formal
) loop
6900 -- Create extra formal for supporting the attribute 'Constrained.
6901 -- The case of a private type view without discriminants also
6902 -- requires the extra formal if the underlying type has defaulted
6905 if Ekind
(Formal
) /= E_In_Parameter
then
6906 if Present
(P_Formal
) then
6907 Formal_Type
:= Etype
(P_Formal
);
6909 Formal_Type
:= Etype
(Formal
);
6912 -- Do not produce extra formals for Unchecked_Union parameters.
6913 -- Jump directly to the end of the loop.
6915 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
6916 goto Skip_Extra_Formal_Generation
;
6919 if not Has_Discriminants
(Formal_Type
)
6920 and then Ekind
(Formal_Type
) in Private_Kind
6921 and then Present
(Underlying_Type
(Formal_Type
))
6923 Formal_Type
:= Underlying_Type
(Formal_Type
);
6926 -- Suppress the extra formal if formal's subtype is constrained or
6927 -- indefinite, or we're compiling for Ada 2012 and the underlying
6928 -- type is tagged and limited. In Ada 2012, a limited tagged type
6929 -- can have defaulted discriminants, but 'Constrained is required
6930 -- to return True, so the formal is never needed (see AI05-0214).
6931 -- Note that this ensures consistency of calling sequences for
6932 -- dispatching operations when some types in a class have defaults
6933 -- on discriminants and others do not (and requiring the extra
6934 -- formal would introduce distributed overhead).
6936 -- If the type does not have a completion yet, treat as prior to
6937 -- Ada 2012 for consistency.
6939 if Has_Discriminants
(Formal_Type
)
6940 and then not Is_Constrained
(Formal_Type
)
6941 and then not Is_Indefinite_Subtype
(Formal_Type
)
6942 and then (Ada_Version
< Ada_2012
6943 or else No
(Underlying_Type
(Formal_Type
))
6945 (Is_Limited_Type
(Formal_Type
)
6948 (Underlying_Type
(Formal_Type
)))))
6950 Set_Extra_Constrained
6951 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
6955 -- Create extra formal for supporting accessibility checking. This
6956 -- is done for both anonymous access formals and formals of named
6957 -- access types that are marked as controlling formals. The latter
6958 -- case can occur when Expand_Dispatching_Call creates a subprogram
6959 -- type and substitutes the types of access-to-class-wide actuals
6960 -- for the anonymous access-to-specific-type of controlling formals.
6961 -- Base_Type is applied because in cases where there is a null
6962 -- exclusion the formal may have an access subtype.
6964 -- This is suppressed if we specifically suppress accessibility
6965 -- checks at the package level for either the subprogram, or the
6966 -- package in which it resides. However, we do not suppress it
6967 -- simply if the scope has accessibility checks suppressed, since
6968 -- this could cause trouble when clients are compiled with a
6969 -- different suppression setting. The explicit checks at the
6970 -- package level are safe from this point of view.
6972 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
6973 or else (Is_Controlling_Formal
(Formal
)
6974 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
6976 (Explicit_Suppress
(E
, Accessibility_Check
)
6978 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
6981 or else Present
(Extra_Accessibility
(P_Formal
)))
6983 Set_Extra_Accessibility
6984 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
6987 -- This label is required when skipping extra formal generation for
6988 -- Unchecked_Union parameters.
6990 <<Skip_Extra_Formal_Generation
>>
6992 if Present
(P_Formal
) then
6993 Next_Formal
(P_Formal
);
6996 Next_Formal
(Formal
);
6999 <<Test_For_Func_Result_Extras
>>
7001 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
7002 -- function call is ... determined by the point of call ...".
7004 if Needs_Result_Accessibility_Level
(E
) then
7005 Set_Extra_Accessibility_Of_Result
7006 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
7009 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
7010 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
7012 if Ada_Version
>= Ada_2005
and then Is_Build_In_Place_Function
(E
) then
7014 Result_Subt
: constant Entity_Id
:= Etype
(E
);
7015 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
7016 Formal_Typ
: Entity_Id
;
7018 Discard
: Entity_Id
;
7019 pragma Warnings
(Off
, Discard
);
7022 -- In the case of functions with unconstrained result subtypes,
7023 -- add a 4-state formal indicating whether the return object is
7024 -- allocated by the caller (1), or should be allocated by the
7025 -- callee on the secondary stack (2), in the global heap (3), or
7026 -- in a user-defined storage pool (4). For the moment we just use
7027 -- Natural for the type of this formal. Note that this formal
7028 -- isn't usually needed in the case where the result subtype is
7029 -- constrained, but it is needed when the function has a tagged
7030 -- result, because generally such functions can be called in a
7031 -- dispatching context and such calls must be handled like calls
7032 -- to a class-wide function.
7034 if Needs_BIP_Alloc_Form
(E
) then
7037 (E
, Standard_Natural
,
7038 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
7040 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
7041 -- use a user-defined pool. This formal is not added on
7042 -- .NET/JVM/ZFP as those targets do not support pools.
7044 if VM_Target
= No_VM
7045 and then RTE_Available
(RE_Root_Storage_Pool_Ptr
)
7049 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
7050 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
7054 -- In the case of functions whose result type needs finalization,
7055 -- add an extra formal which represents the finalization master.
7057 if Needs_BIP_Finalization_Master
(E
) then
7060 (E
, RTE
(RE_Finalization_Master_Ptr
),
7061 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
7064 -- When the result type contains tasks, add two extra formals: the
7065 -- master of the tasks to be created, and the caller's activation
7068 if Has_Task
(Full_Subt
) then
7071 (E
, RTE
(RE_Master_Id
),
7072 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
7075 (E
, RTE
(RE_Activation_Chain_Access
),
7076 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
7079 -- All build-in-place functions get an extra formal that will be
7080 -- passed the address of the return object within the caller.
7083 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
7085 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
7086 Set_Etype
(Formal_Typ
, Formal_Typ
);
7087 Set_Depends_On_Private
7088 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
7089 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
7090 Set_Is_Access_Constant
(Formal_Typ
, False);
7092 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
7093 -- the designated type comes from the limited view (for back-end
7096 Set_From_Limited_With
7097 (Formal_Typ
, From_Limited_With
(Result_Subt
));
7099 Layout_Type
(Formal_Typ
);
7103 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
7106 end Create_Extra_Formals
;
7108 -----------------------------
7109 -- Enter_Overloaded_Entity --
7110 -----------------------------
7112 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
7113 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
7114 C_E
: Entity_Id
:= Current_Entity
(S
);
7118 Set_Has_Homonym
(E
);
7119 Set_Has_Homonym
(S
);
7122 Set_Is_Immediately_Visible
(S
);
7123 Set_Scope
(S
, Current_Scope
);
7125 -- Chain new entity if front of homonym in current scope, so that
7126 -- homonyms are contiguous.
7128 if Present
(E
) and then E
/= C_E
then
7129 while Homonym
(C_E
) /= E
loop
7130 C_E
:= Homonym
(C_E
);
7133 Set_Homonym
(C_E
, S
);
7137 Set_Current_Entity
(S
);
7142 if Is_Inherited_Operation
(S
) then
7143 Append_Inherited_Subprogram
(S
);
7145 Append_Entity
(S
, Current_Scope
);
7148 Set_Public_Status
(S
);
7150 if Debug_Flag_E
then
7151 Write_Str
("New overloaded entity chain: ");
7152 Write_Name
(Chars
(S
));
7155 while Present
(E
) loop
7156 Write_Str
(" "); Write_Int
(Int
(E
));
7163 -- Generate warning for hiding
7166 and then Comes_From_Source
(S
)
7167 and then In_Extended_Main_Source_Unit
(S
)
7174 -- Warn unless genuine overloading. Do not emit warning on
7175 -- hiding predefined operators in Standard (these are either an
7176 -- (artifact of our implicit declarations, or simple noise) but
7177 -- keep warning on a operator defined on a local subtype, because
7178 -- of the real danger that different operators may be applied in
7179 -- various parts of the program.
7181 -- Note that if E and S have the same scope, there is never any
7182 -- hiding. Either the two conflict, and the program is illegal,
7183 -- or S is overriding an implicit inherited subprogram.
7185 if Scope
(E
) /= Scope
(S
)
7186 and then (not Is_Overloadable
(E
)
7187 or else Subtype_Conformant
(E
, S
))
7188 and then (Is_Immediately_Visible
(E
)
7190 Is_Potentially_Use_Visible
(S
))
7192 if Scope
(E
) /= Standard_Standard
then
7193 Error_Msg_Sloc
:= Sloc
(E
);
7194 Error_Msg_N
("declaration of & hides one #?h?", S
);
7196 elsif Nkind
(S
) = N_Defining_Operator_Symbol
7198 Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /= Scope
(S
)
7201 ("declaration of & hides predefined operator?h?", S
);
7206 end Enter_Overloaded_Entity
;
7208 -----------------------------
7209 -- Check_Untagged_Equality --
7210 -----------------------------
7212 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
7213 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
7214 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
7218 -- This check applies only if we have a subprogram declaration with an
7219 -- untagged record type.
7221 if Nkind
(Decl
) /= N_Subprogram_Declaration
7222 or else not Is_Record_Type
(Typ
)
7223 or else Is_Tagged_Type
(Typ
)
7228 -- In Ada 2012 case, we will output errors or warnings depending on
7229 -- the setting of debug flag -gnatd.E.
7231 if Ada_Version
>= Ada_2012
then
7232 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
7234 -- In earlier versions of Ada, nothing to do unless we are warning on
7235 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
7238 if not Warn_On_Ada_2012_Compatibility
then
7243 -- Cases where the type has already been frozen
7245 if Is_Frozen
(Typ
) then
7247 -- If the type is not declared in a package, or if we are in the body
7248 -- of the package or in some other scope, the new operation is not
7249 -- primitive, and therefore legal, though suspicious. Should we
7250 -- generate a warning in this case ???
7252 if Ekind
(Scope
(Typ
)) /= E_Package
7253 or else Scope
(Typ
) /= Current_Scope
7257 -- If the type is a generic actual (sub)type, the operation is not
7258 -- primitive either because the base type is declared elsewhere.
7260 elsif Is_Generic_Actual_Type
(Typ
) then
7263 -- Here we have a definite error of declaration after freezing
7266 if Ada_Version
>= Ada_2012
then
7268 ("equality operator must be declared before type & is "
7269 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
7271 -- In Ada 2012 mode with error turned to warning, output one
7272 -- more warning to warn that the equality operation may not
7273 -- compose. This is the consequence of ignoring the error.
7275 if Error_Msg_Warn
then
7276 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
7281 ("equality operator must be declared before type& is "
7282 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
7285 -- If we are in the package body, we could just move the
7286 -- declaration to the package spec, so add a message saying that.
7288 if In_Package_Body
(Scope
(Typ
)) then
7289 if Ada_Version
>= Ada_2012
then
7291 ("\move declaration to package spec<<", Eq_Op
);
7294 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
7297 -- Otherwise try to find the freezing point
7300 Obj_Decl
:= Next
(Parent
(Typ
));
7301 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
7302 if Nkind
(Obj_Decl
) = N_Object_Declaration
7303 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
7305 -- Freezing point, output warnings
7307 if Ada_Version
>= Ada_2012
then
7309 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
7311 ("\an equality operator cannot be declared after "
7316 ("type& is frozen by declaration (Ada 2012)?y?",
7319 ("\an equality operator cannot be declared after "
7320 & "this point (Ada 2012)?y?",
7332 -- Here if type is not frozen yet. It is illegal to have a primitive
7333 -- equality declared in the private part if the type is visible.
7335 elsif not In_Same_List
(Parent
(Typ
), Decl
)
7336 and then not Is_Limited_Type
(Typ
)
7338 -- Shouldn't we give an RM reference here???
7340 if Ada_Version
>= Ada_2012
then
7342 ("equality operator appears too late<<", Eq_Op
);
7345 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
7348 -- No error detected
7353 end Check_Untagged_Equality
;
7355 -----------------------------
7356 -- Find_Corresponding_Spec --
7357 -----------------------------
7359 function Find_Corresponding_Spec
7361 Post_Error
: Boolean := True) return Entity_Id
7363 Spec
: constant Node_Id
:= Specification
(N
);
7364 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
7368 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
7369 -- Even if fully conformant, a body may depend on a generic actual when
7370 -- the spec does not, or vice versa, in which case they were distinct
7371 -- entities in the generic.
7373 -------------------------------
7374 -- Different_Generic_Profile --
7375 -------------------------------
7377 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
7380 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
7381 -- Check that the types of corresponding formals have the same
7382 -- generic actual if any. We have to account for subtypes of a
7383 -- generic formal, declared between a spec and a body, which may
7384 -- appear distinct in an instance but matched in the generic, and
7385 -- the subtype may be used either in the spec or the body of the
7386 -- subprogram being checked.
7388 -------------------------
7389 -- Same_Generic_Actual --
7390 -------------------------
7392 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
7394 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
7395 -- Predicate to check whether S1 is a subtype of S2 in the source
7398 -------------------------
7399 -- Is_Declared_Subtype --
7400 -------------------------
7402 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
7404 return Comes_From_Source
(Parent
(S1
))
7405 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
7406 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
7407 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
7408 end Is_Declared_Subtype
;
7410 -- Start of processing for Same_Generic_Actual
7413 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
7414 or else Is_Declared_Subtype
(T1
, T2
)
7415 or else Is_Declared_Subtype
(T2
, T1
);
7416 end Same_Generic_Actual
;
7418 -- Start of processing for Different_Generic_Profile
7421 if not In_Instance
then
7424 elsif Ekind
(E
) = E_Function
7425 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
7430 F1
:= First_Formal
(Designator
);
7431 F2
:= First_Formal
(E
);
7432 while Present
(F1
) loop
7433 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
7442 end Different_Generic_Profile
;
7444 -- Start of processing for Find_Corresponding_Spec
7447 E
:= Current_Entity
(Designator
);
7448 while Present
(E
) loop
7450 -- We are looking for a matching spec. It must have the same scope,
7451 -- and the same name, and either be type conformant, or be the case
7452 -- of a library procedure spec and its body (which belong to one
7453 -- another regardless of whether they are type conformant or not).
7455 if Scope
(E
) = Current_Scope
then
7456 if Current_Scope
= Standard_Standard
7457 or else (Ekind
(E
) = Ekind
(Designator
)
7458 and then Type_Conformant
(E
, Designator
))
7460 -- Within an instantiation, we know that spec and body are
7461 -- subtype conformant, because they were subtype conformant in
7462 -- the generic. We choose the subtype-conformant entity here as
7463 -- well, to resolve spurious ambiguities in the instance that
7464 -- were not present in the generic (i.e. when two different
7465 -- types are given the same actual). If we are looking for a
7466 -- spec to match a body, full conformance is expected.
7470 -- Inherit the convention and "ghostness" of the matching
7471 -- spec to ensure proper full and subtype conformance.
7473 Set_Convention
(Designator
, Convention
(E
));
7475 if Is_Ghost_Entity
(E
) then
7476 Set_Is_Ghost_Entity
(Designator
);
7479 -- Skip past subprogram bodies and subprogram renamings that
7480 -- may appear to have a matching spec, but that aren't fully
7481 -- conformant with it. That can occur in cases where an
7482 -- actual type causes unrelated homographs in the instance.
7484 if Nkind_In
(N
, N_Subprogram_Body
,
7485 N_Subprogram_Renaming_Declaration
)
7486 and then Present
(Homonym
(E
))
7487 and then not Fully_Conformant
(Designator
, E
)
7491 elsif not Subtype_Conformant
(Designator
, E
) then
7494 elsif Different_Generic_Profile
(E
) then
7499 -- Ada 2012 (AI05-0165): For internally generated bodies of
7500 -- null procedures locate the internally generated spec. We
7501 -- enforce mode conformance since a tagged type may inherit
7502 -- from interfaces several null primitives which differ only
7503 -- in the mode of the formals.
7505 if not (Comes_From_Source
(E
))
7506 and then Is_Null_Procedure
(E
)
7507 and then not Mode_Conformant
(Designator
, E
)
7511 -- For null procedures coming from source that are completions,
7512 -- analysis of the generated body will establish the link.
7514 elsif Comes_From_Source
(E
)
7515 and then Nkind
(Spec
) = N_Procedure_Specification
7516 and then Null_Present
(Spec
)
7520 elsif not Has_Completion
(E
) then
7521 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
7522 Set_Corresponding_Spec
(N
, E
);
7525 Set_Has_Completion
(E
);
7528 elsif Nkind
(Parent
(N
)) = N_Subunit
then
7530 -- If this is the proper body of a subunit, the completion
7531 -- flag is set when analyzing the stub.
7535 -- If E is an internal function with a controlling result that
7536 -- was created for an operation inherited by a null extension,
7537 -- it may be overridden by a body without a previous spec (one
7538 -- more reason why these should be shunned). In that case we
7539 -- remove the generated body if present, because the current
7540 -- one is the explicit overriding.
7542 elsif Ekind
(E
) = E_Function
7543 and then Ada_Version
>= Ada_2005
7544 and then not Comes_From_Source
(E
)
7545 and then Has_Controlling_Result
(E
)
7546 and then Is_Null_Extension
(Etype
(E
))
7547 and then Comes_From_Source
(Spec
)
7549 Set_Has_Completion
(E
, False);
7552 and then Nkind
(Parent
(E
)) = N_Function_Specification
7555 (Unit_Declaration_Node
7556 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
7560 -- If expansion is disabled, or if the wrapper function has
7561 -- not been generated yet, this a late body overriding an
7562 -- inherited operation, or it is an overriding by some other
7563 -- declaration before the controlling result is frozen. In
7564 -- either case this is a declaration of a new entity.
7570 -- If the body already exists, then this is an error unless
7571 -- the previous declaration is the implicit declaration of a
7572 -- derived subprogram. It is also legal for an instance to
7573 -- contain type conformant overloadable declarations (but the
7574 -- generic declaration may not), per 8.3(26/2).
7576 elsif No
(Alias
(E
))
7577 and then not Is_Intrinsic_Subprogram
(E
)
7578 and then not In_Instance
7581 Error_Msg_Sloc
:= Sloc
(E
);
7583 if Is_Imported
(E
) then
7585 ("body not allowed for imported subprogram & declared#",
7588 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
7592 -- Child units cannot be overloaded, so a conformance mismatch
7593 -- between body and a previous spec is an error.
7595 elsif Is_Child_Unit
(E
)
7597 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
7599 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
7604 ("body of child unit does not match previous declaration", N
);
7612 -- On exit, we know that no previous declaration of subprogram exists
7615 end Find_Corresponding_Spec
;
7617 ----------------------
7618 -- Fully_Conformant --
7619 ----------------------
7621 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
7624 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
7626 end Fully_Conformant
;
7628 ----------------------------------
7629 -- Fully_Conformant_Expressions --
7630 ----------------------------------
7632 function Fully_Conformant_Expressions
7633 (Given_E1
: Node_Id
;
7634 Given_E2
: Node_Id
) return Boolean
7636 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
7637 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
7638 -- We always test conformance on original nodes, since it is possible
7639 -- for analysis and/or expansion to make things look as though they
7640 -- conform when they do not, e.g. by converting 1+2 into 3.
7642 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
7643 renames Fully_Conformant_Expressions
;
7645 function FCL
(L1
, L2
: List_Id
) return Boolean;
7646 -- Compare elements of two lists for conformance. Elements have to be
7647 -- conformant, and actuals inserted as default parameters do not match
7648 -- explicit actuals with the same value.
7650 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
7651 -- Compare an operator node with a function call
7657 function FCL
(L1
, L2
: List_Id
) return Boolean is
7661 if L1
= No_List
then
7667 if L2
= No_List
then
7673 -- Compare two lists, skipping rewrite insertions (we want to compare
7674 -- the original trees, not the expanded versions).
7677 if Is_Rewrite_Insertion
(N1
) then
7679 elsif Is_Rewrite_Insertion
(N2
) then
7685 elsif not FCE
(N1
, N2
) then
7698 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
7699 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
7704 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
7709 Act
:= First
(Actuals
);
7711 if Nkind
(Op_Node
) in N_Binary_Op
then
7712 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
7719 return Present
(Act
)
7720 and then FCE
(Right_Opnd
(Op_Node
), Act
)
7721 and then No
(Next
(Act
));
7725 -- Start of processing for Fully_Conformant_Expressions
7728 -- Non-conformant if paren count does not match. Note: if some idiot
7729 -- complains that we don't do this right for more than 3 levels of
7730 -- parentheses, they will be treated with the respect they deserve.
7732 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
7735 -- If same entities are referenced, then they are conformant even if
7736 -- they have different forms (RM 8.3.1(19-20)).
7738 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
7739 if Present
(Entity
(E1
)) then
7740 return Entity
(E1
) = Entity
(E2
)
7741 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
7742 and then Ekind
(Entity
(E1
)) = E_Discriminant
7743 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
7745 elsif Nkind
(E1
) = N_Expanded_Name
7746 and then Nkind
(E2
) = N_Expanded_Name
7747 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7748 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7750 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
7753 -- Identifiers in component associations don't always have
7754 -- entities, but their names must conform.
7756 return Nkind
(E1
) = N_Identifier
7757 and then Nkind
(E2
) = N_Identifier
7758 and then Chars
(E1
) = Chars
(E2
);
7761 elsif Nkind
(E1
) = N_Character_Literal
7762 and then Nkind
(E2
) = N_Expanded_Name
7764 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7765 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
7767 elsif Nkind
(E2
) = N_Character_Literal
7768 and then Nkind
(E1
) = N_Expanded_Name
7770 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7771 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
7773 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
7774 return FCO
(E1
, E2
);
7776 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
7777 return FCO
(E2
, E1
);
7779 -- Otherwise we must have the same syntactic entity
7781 elsif Nkind
(E1
) /= Nkind
(E2
) then
7784 -- At this point, we specialize by node type
7791 FCL
(Expressions
(E1
), Expressions
(E2
))
7793 FCL
(Component_Associations
(E1
),
7794 Component_Associations
(E2
));
7797 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
7799 Nkind
(Expression
(E2
)) = N_Qualified_Expression
7801 return FCE
(Expression
(E1
), Expression
(E2
));
7803 -- Check that the subtype marks and any constraints
7808 Indic1
: constant Node_Id
:= Expression
(E1
);
7809 Indic2
: constant Node_Id
:= Expression
(E2
);
7814 if Nkind
(Indic1
) /= N_Subtype_Indication
then
7816 Nkind
(Indic2
) /= N_Subtype_Indication
7817 and then Entity
(Indic1
) = Entity
(Indic2
);
7819 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
7821 Nkind
(Indic1
) /= N_Subtype_Indication
7822 and then Entity
(Indic1
) = Entity
(Indic2
);
7825 if Entity
(Subtype_Mark
(Indic1
)) /=
7826 Entity
(Subtype_Mark
(Indic2
))
7831 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
7832 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
7833 while Present
(Elt1
) and then Present
(Elt2
) loop
7834 if not FCE
(Elt1
, Elt2
) then
7847 when N_Attribute_Reference
=>
7849 Attribute_Name
(E1
) = Attribute_Name
(E2
)
7850 and then FCL
(Expressions
(E1
), Expressions
(E2
));
7854 Entity
(E1
) = Entity
(E2
)
7855 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7856 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7858 when N_Short_Circuit | N_Membership_Test
=>
7860 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7862 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7864 when N_Case_Expression
=>
7870 if not FCE
(Expression
(E1
), Expression
(E2
)) then
7874 Alt1
:= First
(Alternatives
(E1
));
7875 Alt2
:= First
(Alternatives
(E2
));
7877 if Present
(Alt1
) /= Present
(Alt2
) then
7879 elsif No
(Alt1
) then
7883 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
7884 or else not FCL
(Discrete_Choices
(Alt1
),
7885 Discrete_Choices
(Alt2
))
7896 when N_Character_Literal
=>
7898 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
7900 when N_Component_Association
=>
7902 FCL
(Choices
(E1
), Choices
(E2
))
7904 FCE
(Expression
(E1
), Expression
(E2
));
7906 when N_Explicit_Dereference
=>
7908 FCE
(Prefix
(E1
), Prefix
(E2
));
7910 when N_Extension_Aggregate
=>
7912 FCL
(Expressions
(E1
), Expressions
(E2
))
7913 and then Null_Record_Present
(E1
) =
7914 Null_Record_Present
(E2
)
7915 and then FCL
(Component_Associations
(E1
),
7916 Component_Associations
(E2
));
7918 when N_Function_Call
=>
7920 FCE
(Name
(E1
), Name
(E2
))
7922 FCL
(Parameter_Associations
(E1
),
7923 Parameter_Associations
(E2
));
7925 when N_If_Expression
=>
7927 FCL
(Expressions
(E1
), Expressions
(E2
));
7929 when N_Indexed_Component
=>
7931 FCE
(Prefix
(E1
), Prefix
(E2
))
7933 FCL
(Expressions
(E1
), Expressions
(E2
));
7935 when N_Integer_Literal
=>
7936 return (Intval
(E1
) = Intval
(E2
));
7941 when N_Operator_Symbol
=>
7943 Chars
(E1
) = Chars
(E2
);
7945 when N_Others_Choice
=>
7948 when N_Parameter_Association
=>
7950 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
7951 and then FCE
(Explicit_Actual_Parameter
(E1
),
7952 Explicit_Actual_Parameter
(E2
));
7954 when N_Qualified_Expression
=>
7956 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7958 FCE
(Expression
(E1
), Expression
(E2
));
7960 when N_Quantified_Expression
=>
7961 if not FCE
(Condition
(E1
), Condition
(E2
)) then
7965 if Present
(Loop_Parameter_Specification
(E1
))
7966 and then Present
(Loop_Parameter_Specification
(E2
))
7969 L1
: constant Node_Id
:=
7970 Loop_Parameter_Specification
(E1
);
7971 L2
: constant Node_Id
:=
7972 Loop_Parameter_Specification
(E2
);
7976 Reverse_Present
(L1
) = Reverse_Present
(L2
)
7978 FCE
(Defining_Identifier
(L1
),
7979 Defining_Identifier
(L2
))
7981 FCE
(Discrete_Subtype_Definition
(L1
),
7982 Discrete_Subtype_Definition
(L2
));
7985 elsif Present
(Iterator_Specification
(E1
))
7986 and then Present
(Iterator_Specification
(E2
))
7989 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
7990 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
7994 FCE
(Defining_Identifier
(I1
),
7995 Defining_Identifier
(I2
))
7997 Of_Present
(I1
) = Of_Present
(I2
)
7999 Reverse_Present
(I1
) = Reverse_Present
(I2
)
8000 and then FCE
(Name
(I1
), Name
(I2
))
8001 and then FCE
(Subtype_Indication
(I1
),
8002 Subtype_Indication
(I2
));
8005 -- The quantified expressions used different specifications to
8006 -- walk their respective ranges.
8014 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
8016 FCE
(High_Bound
(E1
), High_Bound
(E2
));
8018 when N_Real_Literal
=>
8019 return (Realval
(E1
) = Realval
(E2
));
8021 when N_Selected_Component
=>
8023 FCE
(Prefix
(E1
), Prefix
(E2
))
8025 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
8029 FCE
(Prefix
(E1
), Prefix
(E2
))
8031 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
8033 when N_String_Literal
=>
8035 S1
: constant String_Id
:= Strval
(E1
);
8036 S2
: constant String_Id
:= Strval
(E2
);
8037 L1
: constant Nat
:= String_Length
(S1
);
8038 L2
: constant Nat
:= String_Length
(S2
);
8045 for J
in 1 .. L1
loop
8046 if Get_String_Char
(S1
, J
) /=
8047 Get_String_Char
(S2
, J
)
8057 when N_Type_Conversion
=>
8059 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
8061 FCE
(Expression
(E1
), Expression
(E2
));
8065 Entity
(E1
) = Entity
(E2
)
8067 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
8069 when N_Unchecked_Type_Conversion
=>
8071 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
8073 FCE
(Expression
(E1
), Expression
(E2
));
8075 -- All other node types cannot appear in this context. Strictly
8076 -- we should raise a fatal internal error. Instead we just ignore
8077 -- the nodes. This means that if anyone makes a mistake in the
8078 -- expander and mucks an expression tree irretrievably, the result
8079 -- will be a failure to detect a (probably very obscure) case
8080 -- of non-conformance, which is better than bombing on some
8081 -- case where two expressions do in fact conform.
8088 end Fully_Conformant_Expressions
;
8090 ----------------------------------------
8091 -- Fully_Conformant_Discrete_Subtypes --
8092 ----------------------------------------
8094 function Fully_Conformant_Discrete_Subtypes
8095 (Given_S1
: Node_Id
;
8096 Given_S2
: Node_Id
) return Boolean
8098 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
8099 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
8101 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
8102 -- Special-case for a bound given by a discriminant, which in the body
8103 -- is replaced with the discriminal of the enclosing type.
8105 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
8106 -- Check both bounds
8108 -----------------------
8109 -- Conforming_Bounds --
8110 -----------------------
8112 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
8114 if Is_Entity_Name
(B1
)
8115 and then Is_Entity_Name
(B2
)
8116 and then Ekind
(Entity
(B1
)) = E_Discriminant
8118 return Chars
(B1
) = Chars
(B2
);
8121 return Fully_Conformant_Expressions
(B1
, B2
);
8123 end Conforming_Bounds
;
8125 -----------------------
8126 -- Conforming_Ranges --
8127 -----------------------
8129 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
8132 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
8134 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
8135 end Conforming_Ranges
;
8137 -- Start of processing for Fully_Conformant_Discrete_Subtypes
8140 if Nkind
(S1
) /= Nkind
(S2
) then
8143 elsif Is_Entity_Name
(S1
) then
8144 return Entity
(S1
) = Entity
(S2
);
8146 elsif Nkind
(S1
) = N_Range
then
8147 return Conforming_Ranges
(S1
, S2
);
8149 elsif Nkind
(S1
) = N_Subtype_Indication
then
8151 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
8154 (Range_Expression
(Constraint
(S1
)),
8155 Range_Expression
(Constraint
(S2
)));
8159 end Fully_Conformant_Discrete_Subtypes
;
8161 --------------------
8162 -- Install_Entity --
8163 --------------------
8165 procedure Install_Entity
(E
: Entity_Id
) is
8166 Prev
: constant Entity_Id
:= Current_Entity
(E
);
8168 Set_Is_Immediately_Visible
(E
);
8169 Set_Current_Entity
(E
);
8170 Set_Homonym
(E
, Prev
);
8173 ---------------------
8174 -- Install_Formals --
8175 ---------------------
8177 procedure Install_Formals
(Id
: Entity_Id
) is
8180 F
:= First_Formal
(Id
);
8181 while Present
(F
) loop
8185 end Install_Formals
;
8187 -----------------------------
8188 -- Is_Interface_Conformant --
8189 -----------------------------
8191 function Is_Interface_Conformant
8192 (Tagged_Type
: Entity_Id
;
8193 Iface_Prim
: Entity_Id
;
8194 Prim
: Entity_Id
) return Boolean
8196 -- The operation may in fact be an inherited (implicit) operation
8197 -- rather than the original interface primitive, so retrieve the
8198 -- ultimate ancestor.
8200 Iface
: constant Entity_Id
:=
8201 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
8202 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
8204 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
8205 -- Return the controlling formal of Prim
8207 ------------------------
8208 -- Controlling_Formal --
8209 ------------------------
8211 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
8215 E
:= First_Entity
(Prim
);
8216 while Present
(E
) loop
8217 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
8225 end Controlling_Formal
;
8229 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
8230 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
8232 -- Start of processing for Is_Interface_Conformant
8235 pragma Assert
(Is_Subprogram
(Iface_Prim
)
8236 and then Is_Subprogram
(Prim
)
8237 and then Is_Dispatching_Operation
(Iface_Prim
)
8238 and then Is_Dispatching_Operation
(Prim
));
8240 pragma Assert
(Is_Interface
(Iface
)
8241 or else (Present
(Alias
(Iface_Prim
))
8244 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
8246 if Prim
= Iface_Prim
8247 or else not Is_Subprogram
(Prim
)
8248 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
8249 or else not Is_Dispatching_Operation
(Prim
)
8250 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
8252 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
8253 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
8257 -- The mode of the controlling formals must match
8259 elsif Present
(Iface_Ctrl_F
)
8260 and then Present
(Prim_Ctrl_F
)
8261 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
8265 -- Case of a procedure, or a function whose result type matches the
8266 -- result type of the interface primitive, or a function that has no
8267 -- controlling result (I or access I).
8269 elsif Ekind
(Iface_Prim
) = E_Procedure
8270 or else Etype
(Prim
) = Etype
(Iface_Prim
)
8271 or else not Has_Controlling_Result
(Prim
)
8273 return Type_Conformant
8274 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
8276 -- Case of a function returning an interface, or an access to one. Check
8277 -- that the return types correspond.
8279 elsif Implements_Interface
(Typ
, Iface
) then
8280 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
8282 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
8287 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
8288 Skip_Controlling_Formals
=> True);
8294 end Is_Interface_Conformant
;
8296 ---------------------------------
8297 -- Is_Non_Overriding_Operation --
8298 ---------------------------------
8300 function Is_Non_Overriding_Operation
8301 (Prev_E
: Entity_Id
;
8302 New_E
: Entity_Id
) return Boolean
8306 G_Typ
: Entity_Id
:= Empty
;
8308 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
8309 -- If F_Type is a derived type associated with a generic actual subtype,
8310 -- then return its Generic_Parent_Type attribute, else return Empty.
8312 function Types_Correspond
8313 (P_Type
: Entity_Id
;
8314 N_Type
: Entity_Id
) return Boolean;
8315 -- Returns true if and only if the types (or designated types in the
8316 -- case of anonymous access types) are the same or N_Type is derived
8317 -- directly or indirectly from P_Type.
8319 -----------------------------
8320 -- Get_Generic_Parent_Type --
8321 -----------------------------
8323 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
8329 if Is_Derived_Type
(F_Typ
)
8330 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
8332 -- The tree must be traversed to determine the parent subtype in
8333 -- the generic unit, which unfortunately isn't always available
8334 -- via semantic attributes. ??? (Note: The use of Original_Node
8335 -- is needed for cases where a full derived type has been
8338 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
8339 if Nkind
(Defn
) = N_Derived_Type_Definition
then
8340 Indic
:= Subtype_Indication
(Defn
);
8342 if Nkind
(Indic
) = N_Subtype_Indication
then
8343 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
8345 G_Typ
:= Entity
(Indic
);
8348 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
8349 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
8351 return Generic_Parent_Type
(Parent
(G_Typ
));
8357 end Get_Generic_Parent_Type
;
8359 ----------------------
8360 -- Types_Correspond --
8361 ----------------------
8363 function Types_Correspond
8364 (P_Type
: Entity_Id
;
8365 N_Type
: Entity_Id
) return Boolean
8367 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
8368 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
8371 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
8372 Prev_Type
:= Designated_Type
(Prev_Type
);
8375 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
8376 New_Type
:= Designated_Type
(New_Type
);
8379 if Prev_Type
= New_Type
then
8382 elsif not Is_Class_Wide_Type
(New_Type
) then
8383 while Etype
(New_Type
) /= New_Type
loop
8384 New_Type
:= Etype
(New_Type
);
8385 if New_Type
= Prev_Type
then
8391 end Types_Correspond
;
8393 -- Start of processing for Is_Non_Overriding_Operation
8396 -- In the case where both operations are implicit derived subprograms
8397 -- then neither overrides the other. This can only occur in certain
8398 -- obscure cases (e.g., derivation from homographs created in a generic
8401 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
8404 elsif Ekind
(Current_Scope
) = E_Package
8405 and then Is_Generic_Instance
(Current_Scope
)
8406 and then In_Private_Part
(Current_Scope
)
8407 and then Comes_From_Source
(New_E
)
8409 -- We examine the formals and result type of the inherited operation,
8410 -- to determine whether their type is derived from (the instance of)
8411 -- a generic type. The first such formal or result type is the one
8414 Formal
:= First_Formal
(Prev_E
);
8415 while Present
(Formal
) loop
8416 F_Typ
:= Base_Type
(Etype
(Formal
));
8418 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
8419 F_Typ
:= Designated_Type
(F_Typ
);
8422 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
8423 exit when Present
(G_Typ
);
8425 Next_Formal
(Formal
);
8428 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
8429 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
8436 -- If the generic type is a private type, then the original operation
8437 -- was not overriding in the generic, because there was no primitive
8438 -- operation to override.
8440 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
8441 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
8442 N_Formal_Private_Type_Definition
8446 -- The generic parent type is the ancestor of a formal derived
8447 -- type declaration. We need to check whether it has a primitive
8448 -- operation that should be overridden by New_E in the generic.
8452 P_Formal
: Entity_Id
;
8453 N_Formal
: Entity_Id
;
8457 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
8460 while Present
(Prim_Elt
) loop
8461 P_Prim
:= Node
(Prim_Elt
);
8463 if Chars
(P_Prim
) = Chars
(New_E
)
8464 and then Ekind
(P_Prim
) = Ekind
(New_E
)
8466 P_Formal
:= First_Formal
(P_Prim
);
8467 N_Formal
:= First_Formal
(New_E
);
8468 while Present
(P_Formal
) and then Present
(N_Formal
) loop
8469 P_Typ
:= Etype
(P_Formal
);
8470 N_Typ
:= Etype
(N_Formal
);
8472 if not Types_Correspond
(P_Typ
, N_Typ
) then
8476 Next_Entity
(P_Formal
);
8477 Next_Entity
(N_Formal
);
8480 -- Found a matching primitive operation belonging to the
8481 -- formal ancestor type, so the new subprogram is
8485 and then No
(N_Formal
)
8486 and then (Ekind
(New_E
) /= E_Function
8489 (Etype
(P_Prim
), Etype
(New_E
)))
8495 Next_Elmt
(Prim_Elt
);
8498 -- If no match found, then the new subprogram does not override
8499 -- in the generic (nor in the instance).
8501 -- If the type in question is not abstract, and the subprogram
8502 -- is, this will be an error if the new operation is in the
8503 -- private part of the instance. Emit a warning now, which will
8504 -- make the subsequent error message easier to understand.
8506 if not Is_Abstract_Type
(F_Typ
)
8507 and then Is_Abstract_Subprogram
(Prev_E
)
8508 and then In_Private_Part
(Current_Scope
)
8510 Error_Msg_Node_2
:= F_Typ
;
8512 ("private operation& in generic unit does not override "
8513 & "any primitive operation of& (RM 12.3 (18))??",
8523 end Is_Non_Overriding_Operation
;
8525 -------------------------------------
8526 -- List_Inherited_Pre_Post_Aspects --
8527 -------------------------------------
8529 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
8531 if Opt
.List_Inherited_Aspects
8532 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
8535 Inherited
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
8539 for J
in Inherited
'Range loop
8540 P
:= Pre_Post_Conditions
(Contract
(Inherited
(J
)));
8541 while Present
(P
) loop
8542 Error_Msg_Sloc
:= Sloc
(P
);
8544 if Class_Present
(P
) and then not Split_PPC
(P
) then
8545 if Pragma_Name
(P
) = Name_Precondition
then
8546 Error_Msg_N
("info: & inherits `Pre''Class` aspect "
8549 Error_Msg_N
("info: & inherits `Post''Class` aspect "
8554 P
:= Next_Pragma
(P
);
8559 end List_Inherited_Pre_Post_Aspects
;
8561 ------------------------------
8562 -- Make_Inequality_Operator --
8563 ------------------------------
8565 -- S is the defining identifier of an equality operator. We build a
8566 -- subprogram declaration with the right signature. This operation is
8567 -- intrinsic, because it is always expanded as the negation of the
8568 -- call to the equality function.
8570 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
8571 Loc
: constant Source_Ptr
:= Sloc
(S
);
8574 Op_Name
: Entity_Id
;
8576 FF
: constant Entity_Id
:= First_Formal
(S
);
8577 NF
: constant Entity_Id
:= Next_Formal
(FF
);
8580 -- Check that equality was properly defined, ignore call if not
8587 A
: constant Entity_Id
:=
8588 Make_Defining_Identifier
(Sloc
(FF
),
8589 Chars
=> Chars
(FF
));
8591 B
: constant Entity_Id
:=
8592 Make_Defining_Identifier
(Sloc
(NF
),
8593 Chars
=> Chars
(NF
));
8596 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
8598 Formals
:= New_List
(
8599 Make_Parameter_Specification
(Loc
,
8600 Defining_Identifier
=> A
,
8602 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
8603 Sloc
(Etype
(First_Formal
(S
))))),
8605 Make_Parameter_Specification
(Loc
,
8606 Defining_Identifier
=> B
,
8608 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
8609 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
8612 Make_Subprogram_Declaration
(Loc
,
8614 Make_Function_Specification
(Loc
,
8615 Defining_Unit_Name
=> Op_Name
,
8616 Parameter_Specifications
=> Formals
,
8617 Result_Definition
=>
8618 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
8620 -- Insert inequality right after equality if it is explicit or after
8621 -- the derived type when implicit. These entities are created only
8622 -- for visibility purposes, and eventually replaced in the course
8623 -- of expansion, so they do not need to be attached to the tree and
8624 -- seen by the back-end. Keeping them internal also avoids spurious
8625 -- freezing problems. The declaration is inserted in the tree for
8626 -- analysis, and removed afterwards. If the equality operator comes
8627 -- from an explicit declaration, attach the inequality immediately
8628 -- after. Else the equality is inherited from a derived type
8629 -- declaration, so insert inequality after that declaration.
8631 if No
(Alias
(S
)) then
8632 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
8633 elsif Is_List_Member
(Parent
(S
)) then
8634 Insert_After
(Parent
(S
), Decl
);
8636 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
8639 Mark_Rewrite_Insertion
(Decl
);
8640 Set_Is_Intrinsic_Subprogram
(Op_Name
);
8643 Set_Has_Completion
(Op_Name
);
8644 Set_Corresponding_Equality
(Op_Name
, S
);
8645 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
8647 end Make_Inequality_Operator
;
8649 ----------------------
8650 -- May_Need_Actuals --
8651 ----------------------
8653 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
8658 F
:= First_Formal
(Fun
);
8660 while Present
(F
) loop
8661 if No
(Default_Value
(F
)) then
8669 Set_Needs_No_Actuals
(Fun
, B
);
8670 end May_Need_Actuals
;
8672 ---------------------
8673 -- Mode_Conformant --
8674 ---------------------
8676 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8679 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
8681 end Mode_Conformant
;
8683 ---------------------------
8684 -- New_Overloaded_Entity --
8685 ---------------------------
8687 procedure New_Overloaded_Entity
8689 Derived_Type
: Entity_Id
:= Empty
)
8691 Overridden_Subp
: Entity_Id
:= Empty
;
8692 -- Set if the current scope has an operation that is type-conformant
8693 -- with S, and becomes hidden by S.
8695 Is_Primitive_Subp
: Boolean;
8696 -- Set to True if the new subprogram is primitive
8699 -- Entity that S overrides
8701 Prev_Vis
: Entity_Id
:= Empty
;
8702 -- Predecessor of E in Homonym chain
8704 procedure Check_For_Primitive_Subprogram
8705 (Is_Primitive
: out Boolean;
8706 Is_Overriding
: Boolean := False);
8707 -- If the subprogram being analyzed is a primitive operation of the type
8708 -- of a formal or result, set the Has_Primitive_Operations flag on the
8709 -- type, and set Is_Primitive to True (otherwise set to False). Set the
8710 -- corresponding flag on the entity itself for later use.
8712 procedure Check_Synchronized_Overriding
8713 (Def_Id
: Entity_Id
;
8714 Overridden_Subp
: out Entity_Id
);
8715 -- First determine if Def_Id is an entry or a subprogram either defined
8716 -- in the scope of a task or protected type, or is a primitive of such
8717 -- a type. Check whether Def_Id overrides a subprogram of an interface
8718 -- implemented by the synchronized type, return the overridden entity
8721 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
8722 -- Check that E is declared in the private part of the current package,
8723 -- or in the package body, where it may hide a previous declaration.
8724 -- We can't use In_Private_Part by itself because this flag is also
8725 -- set when freezing entities, so we must examine the place of the
8726 -- declaration in the tree, and recognize wrapper packages as well.
8728 function Is_Overriding_Alias
8730 New_E
: Entity_Id
) return Boolean;
8731 -- Check whether new subprogram and old subprogram are both inherited
8732 -- from subprograms that have distinct dispatch table entries. This can
8733 -- occur with derivations from instances with accidental homonyms. The
8734 -- function is conservative given that the converse is only true within
8735 -- instances that contain accidental overloadings.
8737 ------------------------------------
8738 -- Check_For_Primitive_Subprogram --
8739 ------------------------------------
8741 procedure Check_For_Primitive_Subprogram
8742 (Is_Primitive
: out Boolean;
8743 Is_Overriding
: Boolean := False)
8749 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
8750 -- Returns true if T is declared in the visible part of the current
8751 -- package scope; otherwise returns false. Assumes that T is declared
8754 procedure Check_Private_Overriding
(T
: Entity_Id
);
8755 -- Checks that if a primitive abstract subprogram of a visible
8756 -- abstract type is declared in a private part, then it must override
8757 -- an abstract subprogram declared in the visible part. Also checks
8758 -- that if a primitive function with a controlling result is declared
8759 -- in a private part, then it must override a function declared in
8760 -- the visible part.
8762 ------------------------------
8763 -- Check_Private_Overriding --
8764 ------------------------------
8766 procedure Check_Private_Overriding
(T
: Entity_Id
) is
8768 if Is_Package_Or_Generic_Package
(Current_Scope
)
8769 and then In_Private_Part
(Current_Scope
)
8770 and then Visible_Part_Type
(T
)
8771 and then not In_Instance
8773 if Is_Abstract_Type
(T
)
8774 and then Is_Abstract_Subprogram
(S
)
8775 and then (not Is_Overriding
8776 or else not Is_Abstract_Subprogram
(E
))
8778 Error_Msg_N
("abstract subprograms must be visible "
8779 & "(RM 3.9.3(10))!", S
);
8781 elsif Ekind
(S
) = E_Function
and then not Is_Overriding
then
8782 if Is_Tagged_Type
(T
) and then T
= Base_Type
(Etype
(S
)) then
8783 Error_Msg_N
("private function with tagged result must"
8784 & " override visible-part function", S
);
8785 Error_Msg_N
("\move subprogram to the visible part"
8786 & " (RM 3.9.3(10))", S
);
8788 -- AI05-0073: extend this test to the case of a function
8789 -- with a controlling access result.
8791 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
8792 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
8794 not Is_Class_Wide_Type
(Designated_Type
(Etype
(S
)))
8795 and then Ada_Version
>= Ada_2012
8798 ("private function with controlling access result "
8799 & "must override visible-part function", S
);
8801 ("\move subprogram to the visible part"
8802 & " (RM 3.9.3(10))", S
);
8806 end Check_Private_Overriding
;
8808 -----------------------
8809 -- Visible_Part_Type --
8810 -----------------------
8812 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
8813 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
8817 -- If the entity is a private type, then it must be declared in a
8820 if Ekind
(T
) in Private_Kind
then
8824 -- Otherwise, we traverse the visible part looking for its
8825 -- corresponding declaration. We cannot use the declaration
8826 -- node directly because in the private part the entity of a
8827 -- private type is the one in the full view, which does not
8828 -- indicate that it is the completion of something visible.
8830 N
:= First
(Visible_Declarations
(Specification
(P
)));
8831 while Present
(N
) loop
8832 if Nkind
(N
) = N_Full_Type_Declaration
8833 and then Present
(Defining_Identifier
(N
))
8834 and then T
= Defining_Identifier
(N
)
8838 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
8839 N_Private_Extension_Declaration
)
8840 and then Present
(Defining_Identifier
(N
))
8841 and then T
= Full_View
(Defining_Identifier
(N
))
8850 end Visible_Part_Type
;
8852 -- Start of processing for Check_For_Primitive_Subprogram
8855 Is_Primitive
:= False;
8857 if not Comes_From_Source
(S
) then
8860 -- If subprogram is at library level, it is not primitive operation
8862 elsif Current_Scope
= Standard_Standard
then
8865 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
8866 and then not In_Package_Body
(Current_Scope
))
8867 or else Is_Overriding
8869 -- For function, check return type
8871 if Ekind
(S
) = E_Function
then
8872 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
8873 F_Typ
:= Designated_Type
(Etype
(S
));
8878 B_Typ
:= Base_Type
(F_Typ
);
8880 if Scope
(B_Typ
) = Current_Scope
8881 and then not Is_Class_Wide_Type
(B_Typ
)
8882 and then not Is_Generic_Type
(B_Typ
)
8884 Is_Primitive
:= True;
8885 Set_Has_Primitive_Operations
(B_Typ
);
8886 Set_Is_Primitive
(S
);
8887 Check_Private_Overriding
(B_Typ
);
8891 -- For all subprograms, check formals
8893 Formal
:= First_Formal
(S
);
8894 while Present
(Formal
) loop
8895 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
8896 F_Typ
:= Designated_Type
(Etype
(Formal
));
8898 F_Typ
:= Etype
(Formal
);
8901 B_Typ
:= Base_Type
(F_Typ
);
8903 if Ekind
(B_Typ
) = E_Access_Subtype
then
8904 B_Typ
:= Base_Type
(B_Typ
);
8907 if Scope
(B_Typ
) = Current_Scope
8908 and then not Is_Class_Wide_Type
(B_Typ
)
8909 and then not Is_Generic_Type
(B_Typ
)
8911 Is_Primitive
:= True;
8912 Set_Is_Primitive
(S
);
8913 Set_Has_Primitive_Operations
(B_Typ
);
8914 Check_Private_Overriding
(B_Typ
);
8917 Next_Formal
(Formal
);
8920 -- Special case: An equality function can be redefined for a type
8921 -- occurring in a declarative part, and won't otherwise be treated as
8922 -- a primitive because it doesn't occur in a package spec and doesn't
8923 -- override an inherited subprogram. It's important that we mark it
8924 -- primitive so it can be returned by Collect_Primitive_Operations
8925 -- and be used in composing the equality operation of later types
8926 -- that have a component of the type.
8928 elsif Chars
(S
) = Name_Op_Eq
8929 and then Etype
(S
) = Standard_Boolean
8931 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
8933 if Scope
(B_Typ
) = Current_Scope
8935 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
8936 and then not Is_Limited_Type
(B_Typ
)
8938 Is_Primitive
:= True;
8939 Set_Is_Primitive
(S
);
8940 Set_Has_Primitive_Operations
(B_Typ
);
8941 Check_Private_Overriding
(B_Typ
);
8944 end Check_For_Primitive_Subprogram
;
8946 -----------------------------------
8947 -- Check_Synchronized_Overriding --
8948 -----------------------------------
8950 procedure Check_Synchronized_Overriding
8951 (Def_Id
: Entity_Id
;
8952 Overridden_Subp
: out Entity_Id
)
8954 Ifaces_List
: Elist_Id
;
8958 function Matches_Prefixed_View_Profile
8959 (Prim_Params
: List_Id
;
8960 Iface_Params
: List_Id
) return Boolean;
8961 -- Determine whether a subprogram's parameter profile Prim_Params
8962 -- matches that of a potentially overridden interface subprogram
8963 -- Iface_Params. Also determine if the type of first parameter of
8964 -- Iface_Params is an implemented interface.
8966 -----------------------------------
8967 -- Matches_Prefixed_View_Profile --
8968 -----------------------------------
8970 function Matches_Prefixed_View_Profile
8971 (Prim_Params
: List_Id
;
8972 Iface_Params
: List_Id
) return Boolean
8974 Iface_Id
: Entity_Id
;
8975 Iface_Param
: Node_Id
;
8976 Iface_Typ
: Entity_Id
;
8977 Prim_Id
: Entity_Id
;
8978 Prim_Param
: Node_Id
;
8979 Prim_Typ
: Entity_Id
;
8981 function Is_Implemented
8982 (Ifaces_List
: Elist_Id
;
8983 Iface
: Entity_Id
) return Boolean;
8984 -- Determine if Iface is implemented by the current task or
8987 --------------------
8988 -- Is_Implemented --
8989 --------------------
8991 function Is_Implemented
8992 (Ifaces_List
: Elist_Id
;
8993 Iface
: Entity_Id
) return Boolean
8995 Iface_Elmt
: Elmt_Id
;
8998 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
8999 while Present
(Iface_Elmt
) loop
9000 if Node
(Iface_Elmt
) = Iface
then
9004 Next_Elmt
(Iface_Elmt
);
9010 -- Start of processing for Matches_Prefixed_View_Profile
9013 Iface_Param
:= First
(Iface_Params
);
9014 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
9016 if Is_Access_Type
(Iface_Typ
) then
9017 Iface_Typ
:= Designated_Type
(Iface_Typ
);
9020 Prim_Param
:= First
(Prim_Params
);
9022 -- The first parameter of the potentially overridden subprogram
9023 -- must be an interface implemented by Prim.
9025 if not Is_Interface
(Iface_Typ
)
9026 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
9031 -- The checks on the object parameters are done, move onto the
9032 -- rest of the parameters.
9034 if not In_Scope
then
9035 Prim_Param
:= Next
(Prim_Param
);
9038 Iface_Param
:= Next
(Iface_Param
);
9039 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
9040 Iface_Id
:= Defining_Identifier
(Iface_Param
);
9041 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
9043 Prim_Id
:= Defining_Identifier
(Prim_Param
);
9044 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
9046 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
9047 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
9048 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
9050 Iface_Typ
:= Designated_Type
(Iface_Typ
);
9051 Prim_Typ
:= Designated_Type
(Prim_Typ
);
9054 -- Case of multiple interface types inside a parameter profile
9056 -- (Obj_Param : in out Iface; ...; Param : Iface)
9058 -- If the interface type is implemented, then the matching type
9059 -- in the primitive should be the implementing record type.
9061 if Ekind
(Iface_Typ
) = E_Record_Type
9062 and then Is_Interface
(Iface_Typ
)
9063 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
9065 if Prim_Typ
/= Typ
then
9069 -- The two parameters must be both mode and subtype conformant
9071 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
9073 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
9082 -- One of the two lists contains more parameters than the other
9084 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
9089 end Matches_Prefixed_View_Profile
;
9091 -- Start of processing for Check_Synchronized_Overriding
9094 Overridden_Subp
:= Empty
;
9096 -- Def_Id must be an entry or a subprogram. We should skip predefined
9097 -- primitives internally generated by the frontend; however at this
9098 -- stage predefined primitives are still not fully decorated. As a
9099 -- minor optimization we skip here internally generated subprograms.
9101 if (Ekind
(Def_Id
) /= E_Entry
9102 and then Ekind
(Def_Id
) /= E_Function
9103 and then Ekind
(Def_Id
) /= E_Procedure
)
9104 or else not Comes_From_Source
(Def_Id
)
9109 -- Search for the concurrent declaration since it contains the list
9110 -- of all implemented interfaces. In this case, the subprogram is
9111 -- declared within the scope of a protected or a task type.
9113 if Present
(Scope
(Def_Id
))
9114 and then Is_Concurrent_Type
(Scope
(Def_Id
))
9115 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
9117 Typ
:= Scope
(Def_Id
);
9120 -- The enclosing scope is not a synchronized type and the subprogram
9123 elsif No
(First_Formal
(Def_Id
)) then
9126 -- The subprogram has formals and hence it may be a primitive of a
9130 Typ
:= Etype
(First_Formal
(Def_Id
));
9132 if Is_Access_Type
(Typ
) then
9133 Typ
:= Directly_Designated_Type
(Typ
);
9136 if Is_Concurrent_Type
(Typ
)
9137 and then not Is_Generic_Actual_Type
(Typ
)
9141 -- This case occurs when the concurrent type is declared within
9142 -- a generic unit. As a result the corresponding record has been
9143 -- built and used as the type of the first formal, we just have
9144 -- to retrieve the corresponding concurrent type.
9146 elsif Is_Concurrent_Record_Type
(Typ
)
9147 and then not Is_Class_Wide_Type
(Typ
)
9148 and then Present
(Corresponding_Concurrent_Type
(Typ
))
9150 Typ
:= Corresponding_Concurrent_Type
(Typ
);
9158 -- There is no overriding to check if is an inherited operation in a
9159 -- type derivation on for a generic actual.
9161 Collect_Interfaces
(Typ
, Ifaces_List
);
9163 if Is_Empty_Elmt_List
(Ifaces_List
) then
9167 -- Determine whether entry or subprogram Def_Id overrides a primitive
9168 -- operation that belongs to one of the interfaces in Ifaces_List.
9171 Candidate
: Entity_Id
:= Empty
;
9172 Hom
: Entity_Id
:= Empty
;
9173 Iface_Typ
: Entity_Id
;
9174 Subp
: Entity_Id
:= Empty
;
9177 -- Traverse the homonym chain, looking for a potentially
9178 -- overridden subprogram that belongs to an implemented
9181 Hom
:= Current_Entity_In_Scope
(Def_Id
);
9182 while Present
(Hom
) loop
9186 or else not Is_Overloadable
(Subp
)
9187 or else not Is_Primitive
(Subp
)
9188 or else not Is_Dispatching_Operation
(Subp
)
9189 or else not Present
(Find_Dispatching_Type
(Subp
))
9190 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
9194 -- Entries and procedures can override abstract or null
9195 -- interface procedures.
9197 elsif (Ekind
(Def_Id
) = E_Procedure
9198 or else Ekind
(Def_Id
) = E_Entry
)
9199 and then Ekind
(Subp
) = E_Procedure
9200 and then Matches_Prefixed_View_Profile
9201 (Parameter_Specifications
(Parent
(Def_Id
)),
9202 Parameter_Specifications
(Parent
(Subp
)))
9206 -- For an overridden subprogram Subp, check whether the mode
9207 -- of its first parameter is correct depending on the kind
9208 -- of synchronized type.
9211 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
9214 -- In order for an entry or a protected procedure to
9215 -- override, the first parameter of the overridden
9216 -- routine must be of mode "out", "in out" or
9217 -- access-to-variable.
9219 if Ekind_In
(Candidate
, E_Entry
, E_Procedure
)
9220 and then Is_Protected_Type
(Typ
)
9221 and then Ekind
(Formal
) /= E_In_Out_Parameter
9222 and then Ekind
(Formal
) /= E_Out_Parameter
9223 and then Nkind
(Parameter_Type
(Parent
(Formal
))) /=
9228 -- All other cases are OK since a task entry or routine
9229 -- does not have a restriction on the mode of the first
9230 -- parameter of the overridden interface routine.
9233 Overridden_Subp
:= Candidate
;
9238 -- Functions can override abstract interface functions
9240 elsif Ekind
(Def_Id
) = E_Function
9241 and then Ekind
(Subp
) = E_Function
9242 and then Matches_Prefixed_View_Profile
9243 (Parameter_Specifications
(Parent
(Def_Id
)),
9244 Parameter_Specifications
(Parent
(Subp
)))
9245 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
9246 Etype
(Result_Definition
(Parent
(Subp
)))
9248 Overridden_Subp
:= Subp
;
9252 Hom
:= Homonym
(Hom
);
9255 -- After examining all candidates for overriding, we are left with
9256 -- the best match which is a mode incompatible interface routine.
9257 -- Do not emit an error if the Expander is active since this error
9258 -- will be detected later on after all concurrent types are
9259 -- expanded and all wrappers are built. This check is meant for
9260 -- spec-only compilations.
9262 if Present
(Candidate
) and then not Expander_Active
then
9264 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
9266 -- Def_Id is primitive of a protected type, declared inside the
9267 -- type, and the candidate is primitive of a limited or
9268 -- synchronized interface.
9271 and then Is_Protected_Type
(Typ
)
9273 (Is_Limited_Interface
(Iface_Typ
)
9274 or else Is_Protected_Interface
(Iface_Typ
)
9275 or else Is_Synchronized_Interface
(Iface_Typ
)
9276 or else Is_Task_Interface
(Iface_Typ
))
9278 Error_Msg_PT
(Parent
(Typ
), Candidate
);
9282 Overridden_Subp
:= Candidate
;
9285 end Check_Synchronized_Overriding
;
9287 ----------------------------
9288 -- Is_Private_Declaration --
9289 ----------------------------
9291 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
9292 Priv_Decls
: List_Id
;
9293 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
9296 if Is_Package_Or_Generic_Package
(Current_Scope
)
9297 and then In_Private_Part
(Current_Scope
)
9300 Private_Declarations
(Package_Specification
(Current_Scope
));
9302 return In_Package_Body
(Current_Scope
)
9304 (Is_List_Member
(Decl
)
9305 and then List_Containing
(Decl
) = Priv_Decls
)
9306 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
9309 (Defining_Entity
(Parent
(Decl
)))
9310 and then List_Containing
(Parent
(Parent
(Decl
))) =
9315 end Is_Private_Declaration
;
9317 --------------------------
9318 -- Is_Overriding_Alias --
9319 --------------------------
9321 function Is_Overriding_Alias
9323 New_E
: Entity_Id
) return Boolean
9325 AO
: constant Entity_Id
:= Alias
(Old_E
);
9326 AN
: constant Entity_Id
:= Alias
(New_E
);
9328 return Scope
(AO
) /= Scope
(AN
)
9329 or else No
(DTC_Entity
(AO
))
9330 or else No
(DTC_Entity
(AN
))
9331 or else DT_Position
(AO
) = DT_Position
(AN
);
9332 end Is_Overriding_Alias
;
9334 -- Start of processing for New_Overloaded_Entity
9337 -- We need to look for an entity that S may override. This must be a
9338 -- homonym in the current scope, so we look for the first homonym of
9339 -- S in the current scope as the starting point for the search.
9341 E
:= Current_Entity_In_Scope
(S
);
9343 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
9344 -- They are directly added to the list of primitive operations of
9345 -- Derived_Type, unless this is a rederivation in the private part
9346 -- of an operation that was already derived in the visible part of
9347 -- the current package.
9349 if Ada_Version
>= Ada_2005
9350 and then Present
(Derived_Type
)
9351 and then Present
(Alias
(S
))
9352 and then Is_Dispatching_Operation
(Alias
(S
))
9353 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
9354 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
9356 -- For private types, when the full-view is processed we propagate to
9357 -- the full view the non-overridden entities whose attribute "alias"
9358 -- references an interface primitive. These entities were added by
9359 -- Derive_Subprograms to ensure that interface primitives are
9362 -- Inside_Freeze_Actions is non zero when S corresponds with an
9363 -- internal entity that links an interface primitive with its
9364 -- covering primitive through attribute Interface_Alias (see
9365 -- Add_Internal_Interface_Entities).
9367 if Inside_Freezing_Actions
= 0
9368 and then Is_Package_Or_Generic_Package
(Current_Scope
)
9369 and then In_Private_Part
(Current_Scope
)
9370 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
9371 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
9372 and then Full_View
(Defining_Identifier
(Parent
(E
)))
9373 = Defining_Identifier
(Parent
(S
))
9374 and then Alias
(E
) = Alias
(S
)
9376 Check_Operation_From_Private_View
(S
, E
);
9377 Set_Is_Dispatching_Operation
(S
);
9382 Enter_Overloaded_Entity
(S
);
9383 Check_Dispatching_Operation
(S
, Empty
);
9384 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9390 -- If there is no homonym then this is definitely not overriding
9393 Enter_Overloaded_Entity
(S
);
9394 Check_Dispatching_Operation
(S
, Empty
);
9395 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9397 -- If subprogram has an explicit declaration, check whether it has an
9398 -- overriding indicator.
9400 if Comes_From_Source
(S
) then
9401 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9403 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
9404 -- it may have overridden some hidden inherited primitive. Update
9405 -- Overridden_Subp to avoid spurious errors when checking the
9406 -- overriding indicator.
9408 if Ada_Version
>= Ada_2012
9409 and then No
(Overridden_Subp
)
9410 and then Is_Dispatching_Operation
(S
)
9411 and then Present
(Overridden_Operation
(S
))
9413 Overridden_Subp
:= Overridden_Operation
(S
);
9416 Check_Overriding_Indicator
9417 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9420 -- If there is a homonym that is not overloadable, then we have an
9421 -- error, except for the special cases checked explicitly below.
9423 elsif not Is_Overloadable
(E
) then
9425 -- Check for spurious conflict produced by a subprogram that has the
9426 -- same name as that of the enclosing generic package. The conflict
9427 -- occurs within an instance, between the subprogram and the renaming
9428 -- declaration for the package. After the subprogram, the package
9429 -- renaming declaration becomes hidden.
9431 if Ekind
(E
) = E_Package
9432 and then Present
(Renamed_Object
(E
))
9433 and then Renamed_Object
(E
) = Current_Scope
9434 and then Nkind
(Parent
(Renamed_Object
(E
))) =
9435 N_Package_Specification
9436 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
9439 Set_Is_Immediately_Visible
(E
, False);
9440 Enter_Overloaded_Entity
(S
);
9441 Set_Homonym
(S
, Homonym
(E
));
9442 Check_Dispatching_Operation
(S
, Empty
);
9443 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
9445 -- If the subprogram is implicit it is hidden by the previous
9446 -- declaration. However if it is dispatching, it must appear in the
9447 -- dispatch table anyway, because it can be dispatched to even if it
9448 -- cannot be called directly.
9450 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
9451 Set_Scope
(S
, Current_Scope
);
9453 if Is_Dispatching_Operation
(Alias
(S
)) then
9454 Check_Dispatching_Operation
(S
, Empty
);
9460 Error_Msg_Sloc
:= Sloc
(E
);
9462 -- Generate message, with useful additional warning if in generic
9464 if Is_Generic_Unit
(E
) then
9465 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
9466 Error_Msg_N
("\& conflicts with declaration#", S
);
9468 Error_Msg_N
("& conflicts with declaration#", S
);
9474 -- E exists and is overloadable
9477 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9479 -- Loop through E and its homonyms to determine if any of them is
9480 -- the candidate for overriding by S.
9482 while Present
(E
) loop
9484 -- Definitely not interesting if not in the current scope
9486 if Scope
(E
) /= Current_Scope
then
9489 -- A function can overload the name of an abstract state. The
9490 -- state can be viewed as a function with a profile that cannot
9491 -- be matched by anything.
9493 elsif Ekind
(S
) = E_Function
9494 and then Ekind
(E
) = E_Abstract_State
9496 Enter_Overloaded_Entity
(S
);
9499 -- Ada 2012 (AI05-0165): For internally generated bodies of null
9500 -- procedures locate the internally generated spec. We enforce
9501 -- mode conformance since a tagged type may inherit from
9502 -- interfaces several null primitives which differ only in
9503 -- the mode of the formals.
9505 elsif not Comes_From_Source
(S
)
9506 and then Is_Null_Procedure
(S
)
9507 and then not Mode_Conformant
(E
, S
)
9511 -- Check if we have type conformance
9513 elsif Type_Conformant
(E
, S
) then
9515 -- If the old and new entities have the same profile and one
9516 -- is not the body of the other, then this is an error, unless
9517 -- one of them is implicitly declared.
9519 -- There are some cases when both can be implicit, for example
9520 -- when both a literal and a function that overrides it are
9521 -- inherited in a derivation, or when an inherited operation
9522 -- of a tagged full type overrides the inherited operation of
9523 -- a private extension. Ada 83 had a special rule for the
9524 -- literal case. In Ada 95, the later implicit operation hides
9525 -- the former, and the literal is always the former. In the
9526 -- odd case where both are derived operations declared at the
9527 -- same point, both operations should be declared, and in that
9528 -- case we bypass the following test and proceed to the next
9529 -- part. This can only occur for certain obscure cases in
9530 -- instances, when an operation on a type derived from a formal
9531 -- private type does not override a homograph inherited from
9532 -- the actual. In subsequent derivations of such a type, the
9533 -- DT positions of these operations remain distinct, if they
9536 if Present
(Alias
(S
))
9537 and then (No
(Alias
(E
))
9538 or else Comes_From_Source
(E
)
9539 or else Is_Abstract_Subprogram
(S
)
9541 (Is_Dispatching_Operation
(E
)
9542 and then Is_Overriding_Alias
(E
, S
)))
9543 and then Ekind
(E
) /= E_Enumeration_Literal
9545 -- When an derived operation is overloaded it may be due to
9546 -- the fact that the full view of a private extension
9547 -- re-inherits. It has to be dealt with.
9549 if Is_Package_Or_Generic_Package
(Current_Scope
)
9550 and then In_Private_Part
(Current_Scope
)
9552 Check_Operation_From_Private_View
(S
, E
);
9555 -- In any case the implicit operation remains hidden by the
9556 -- existing declaration, which is overriding. Indicate that
9557 -- E overrides the operation from which S is inherited.
9559 if Present
(Alias
(S
)) then
9560 Set_Overridden_Operation
(E
, Alias
(S
));
9561 Inherit_Subprogram_Contract
(E
, Alias
(S
));
9564 Set_Overridden_Operation
(E
, S
);
9565 Inherit_Subprogram_Contract
(E
, S
);
9568 if Comes_From_Source
(E
) then
9569 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
9574 -- Within an instance, the renaming declarations for actual
9575 -- subprograms may become ambiguous, but they do not hide each
9578 elsif Ekind
(E
) /= E_Entry
9579 and then not Comes_From_Source
(E
)
9580 and then not Is_Generic_Instance
(E
)
9581 and then (Present
(Alias
(E
))
9582 or else Is_Intrinsic_Subprogram
(E
))
9583 and then (not In_Instance
9584 or else No
(Parent
(E
))
9585 or else Nkind
(Unit_Declaration_Node
(E
)) /=
9586 N_Subprogram_Renaming_Declaration
)
9588 -- A subprogram child unit is not allowed to override an
9589 -- inherited subprogram (10.1.1(20)).
9591 if Is_Child_Unit
(S
) then
9593 ("child unit overrides inherited subprogram in parent",
9598 if Is_Non_Overriding_Operation
(E
, S
) then
9599 Enter_Overloaded_Entity
(S
);
9601 if No
(Derived_Type
)
9602 or else Is_Tagged_Type
(Derived_Type
)
9604 Check_Dispatching_Operation
(S
, Empty
);
9610 -- E is a derived operation or an internal operator which
9611 -- is being overridden. Remove E from further visibility.
9612 -- Furthermore, if E is a dispatching operation, it must be
9613 -- replaced in the list of primitive operations of its type
9614 -- (see Override_Dispatching_Operation).
9616 Overridden_Subp
:= E
;
9622 Prev
:= First_Entity
(Current_Scope
);
9623 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
9627 -- It is possible for E to be in the current scope and
9628 -- yet not in the entity chain. This can only occur in a
9629 -- generic context where E is an implicit concatenation
9630 -- in the formal part, because in a generic body the
9631 -- entity chain starts with the formals.
9634 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
9636 -- E must be removed both from the entity_list of the
9637 -- current scope, and from the visibility chain
9639 if Debug_Flag_E
then
9640 Write_Str
("Override implicit operation ");
9641 Write_Int
(Int
(E
));
9645 -- If E is a predefined concatenation, it stands for four
9646 -- different operations. As a result, a single explicit
9647 -- declaration does not hide it. In a possible ambiguous
9648 -- situation, Disambiguate chooses the user-defined op,
9649 -- so it is correct to retain the previous internal one.
9651 if Chars
(E
) /= Name_Op_Concat
9652 or else Ekind
(E
) /= E_Operator
9654 -- For nondispatching derived operations that are
9655 -- overridden by a subprogram declared in the private
9656 -- part of a package, we retain the derived subprogram
9657 -- but mark it as not immediately visible. If the
9658 -- derived operation was declared in the visible part
9659 -- then this ensures that it will still be visible
9660 -- outside the package with the proper signature
9661 -- (calls from outside must also be directed to this
9662 -- version rather than the overriding one, unlike the
9663 -- dispatching case). Calls from inside the package
9664 -- will still resolve to the overriding subprogram
9665 -- since the derived one is marked as not visible
9666 -- within the package.
9668 -- If the private operation is dispatching, we achieve
9669 -- the overriding by keeping the implicit operation
9670 -- but setting its alias to be the overriding one. In
9671 -- this fashion the proper body is executed in all
9672 -- cases, but the original signature is used outside
9675 -- If the overriding is not in the private part, we
9676 -- remove the implicit operation altogether.
9678 if Is_Private_Declaration
(S
) then
9679 if not Is_Dispatching_Operation
(E
) then
9680 Set_Is_Immediately_Visible
(E
, False);
9682 -- Work done in Override_Dispatching_Operation,
9683 -- so nothing else needs to be done here.
9689 -- Find predecessor of E in Homonym chain
9691 if E
= Current_Entity
(E
) then
9694 Prev_Vis
:= Current_Entity
(E
);
9695 while Homonym
(Prev_Vis
) /= E
loop
9696 Prev_Vis
:= Homonym
(Prev_Vis
);
9700 if Prev_Vis
/= Empty
then
9702 -- Skip E in the visibility chain
9704 Set_Homonym
(Prev_Vis
, Homonym
(E
));
9707 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
9710 Set_Next_Entity
(Prev
, Next_Entity
(E
));
9712 if No
(Next_Entity
(Prev
)) then
9713 Set_Last_Entity
(Current_Scope
, Prev
);
9718 Enter_Overloaded_Entity
(S
);
9720 -- For entities generated by Derive_Subprograms the
9721 -- overridden operation is the inherited primitive
9722 -- (which is available through the attribute alias).
9724 if not (Comes_From_Source
(E
))
9725 and then Is_Dispatching_Operation
(E
)
9726 and then Find_Dispatching_Type
(E
) =
9727 Find_Dispatching_Type
(S
)
9728 and then Present
(Alias
(E
))
9729 and then Comes_From_Source
(Alias
(E
))
9731 Set_Overridden_Operation
(S
, Alias
(E
));
9732 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9734 -- Normal case of setting entity as overridden
9736 -- Note: Static_Initialization and Overridden_Operation
9737 -- attributes use the same field in subprogram entities.
9738 -- Static_Initialization is only defined for internal
9739 -- initialization procedures, where Overridden_Operation
9740 -- is irrelevant. Therefore the setting of this attribute
9741 -- must check whether the target is an init_proc.
9743 elsif not Is_Init_Proc
(S
) then
9744 Set_Overridden_Operation
(S
, E
);
9745 Inherit_Subprogram_Contract
(S
, E
);
9748 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
9750 -- If S is a user-defined subprogram or a null procedure
9751 -- expanded to override an inherited null procedure, or a
9752 -- predefined dispatching primitive then indicate that E
9753 -- overrides the operation from which S is inherited.
9755 if Comes_From_Source
(S
)
9757 (Present
(Parent
(S
))
9759 Nkind
(Parent
(S
)) = N_Procedure_Specification
9761 Null_Present
(Parent
(S
)))
9763 (Present
(Alias
(E
))
9765 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
9767 if Present
(Alias
(E
)) then
9768 Set_Overridden_Operation
(S
, Alias
(E
));
9769 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9773 if Is_Dispatching_Operation
(E
) then
9775 -- An overriding dispatching subprogram inherits the
9776 -- convention of the overridden subprogram (AI-117).
9778 Set_Convention
(S
, Convention
(E
));
9779 Check_Dispatching_Operation
(S
, E
);
9782 Check_Dispatching_Operation
(S
, Empty
);
9785 Check_For_Primitive_Subprogram
9786 (Is_Primitive_Subp
, Is_Overriding
=> True);
9787 goto Check_Inequality
;
9790 -- Apparent redeclarations in instances can occur when two
9791 -- formal types get the same actual type. The subprograms in
9792 -- in the instance are legal, even if not callable from the
9793 -- outside. Calls from within are disambiguated elsewhere.
9794 -- For dispatching operations in the visible part, the usual
9795 -- rules apply, and operations with the same profile are not
9798 elsif (In_Instance_Visible_Part
9799 and then not Is_Dispatching_Operation
(E
))
9800 or else In_Instance_Not_Visible
9804 -- Here we have a real error (identical profile)
9807 Error_Msg_Sloc
:= Sloc
(E
);
9809 -- Avoid cascaded errors if the entity appears in
9810 -- subsequent calls.
9812 Set_Scope
(S
, Current_Scope
);
9814 -- Generate error, with extra useful warning for the case
9815 -- of a generic instance with no completion.
9817 if Is_Generic_Instance
(S
)
9818 and then not Has_Completion
(E
)
9821 ("instantiation cannot provide body for&", S
);
9822 Error_Msg_N
("\& conflicts with declaration#", S
);
9824 Error_Msg_N
("& conflicts with declaration#", S
);
9831 -- If one subprogram has an access parameter and the other
9832 -- a parameter of an access type, calls to either might be
9833 -- ambiguous. Verify that parameters match except for the
9834 -- access parameter.
9836 if May_Hide_Profile
then
9842 F1
:= First_Formal
(S
);
9843 F2
:= First_Formal
(E
);
9844 while Present
(F1
) and then Present
(F2
) loop
9845 if Is_Access_Type
(Etype
(F1
)) then
9846 if not Is_Access_Type
(Etype
(F2
))
9847 or else not Conforming_Types
9848 (Designated_Type
(Etype
(F1
)),
9849 Designated_Type
(Etype
(F2
)),
9852 May_Hide_Profile
:= False;
9856 not Conforming_Types
9857 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
9859 May_Hide_Profile
:= False;
9870 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
9879 -- On exit, we know that S is a new entity
9881 Enter_Overloaded_Entity
(S
);
9882 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9883 Check_Overriding_Indicator
9884 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9886 -- Overloading is not allowed in SPARK, except for operators
9888 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
9889 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
9890 Check_SPARK_05_Restriction
9891 ("overloading not allowed with entity#", S
);
9894 -- If S is a derived operation for an untagged type then by
9895 -- definition it's not a dispatching operation (even if the parent
9896 -- operation was dispatching), so Check_Dispatching_Operation is not
9897 -- called in that case.
9899 if No
(Derived_Type
)
9900 or else Is_Tagged_Type
(Derived_Type
)
9902 Check_Dispatching_Operation
(S
, Empty
);
9906 -- If this is a user-defined equality operator that is not a derived
9907 -- subprogram, create the corresponding inequality. If the operation is
9908 -- dispatching, the expansion is done elsewhere, and we do not create
9909 -- an explicit inequality operation.
9911 <<Check_Inequality
>>
9912 if Chars
(S
) = Name_Op_Eq
9913 and then Etype
(S
) = Standard_Boolean
9914 and then Present
(Parent
(S
))
9915 and then not Is_Dispatching_Operation
(S
)
9917 Make_Inequality_Operator
(S
);
9918 Check_Untagged_Equality
(S
);
9920 end New_Overloaded_Entity
;
9922 ---------------------
9923 -- Process_Formals --
9924 ---------------------
9926 procedure Process_Formals
9928 Related_Nod
: Node_Id
)
9930 Param_Spec
: Node_Id
;
9932 Formal_Type
: Entity_Id
;
9936 Num_Out_Params
: Nat
:= 0;
9937 First_Out_Param
: Entity_Id
:= Empty
;
9938 -- Used for setting Is_Only_Out_Parameter
9940 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
9941 -- Determine whether an access type designates a type coming from a
9944 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
9945 -- Check whether the default has a class-wide type. After analysis the
9946 -- default has the type of the formal, so we must also check explicitly
9947 -- for an access attribute.
9949 ----------------------------------
9950 -- Designates_From_Limited_With --
9951 ----------------------------------
9953 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
9954 Desig
: Entity_Id
:= Typ
;
9957 if Is_Access_Type
(Desig
) then
9958 Desig
:= Directly_Designated_Type
(Desig
);
9961 if Is_Class_Wide_Type
(Desig
) then
9962 Desig
:= Root_Type
(Desig
);
9966 Ekind
(Desig
) = E_Incomplete_Type
9967 and then From_Limited_With
(Desig
);
9968 end Designates_From_Limited_With
;
9970 ---------------------------
9971 -- Is_Class_Wide_Default --
9972 ---------------------------
9974 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
9976 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
9977 or else (Nkind
(D
) = N_Attribute_Reference
9978 and then Attribute_Name
(D
) = Name_Access
9979 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
9980 end Is_Class_Wide_Default
;
9982 -- Start of processing for Process_Formals
9985 -- In order to prevent premature use of the formals in the same formal
9986 -- part, the Ekind is left undefined until all default expressions are
9987 -- analyzed. The Ekind is established in a separate loop at the end.
9989 Param_Spec
:= First
(T
);
9990 while Present
(Param_Spec
) loop
9991 Formal
:= Defining_Identifier
(Param_Spec
);
9992 Set_Never_Set_In_Source
(Formal
, True);
9993 Enter_Name
(Formal
);
9995 -- Case of ordinary parameters
9997 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
9998 Find_Type
(Parameter_Type
(Param_Spec
));
9999 Ptype
:= Parameter_Type
(Param_Spec
);
10001 if Ptype
= Error
then
10005 Formal_Type
:= Entity
(Ptype
);
10007 if Is_Incomplete_Type
(Formal_Type
)
10009 (Is_Class_Wide_Type
(Formal_Type
)
10010 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
10012 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
10013 -- primitive operations, as long as their completion is
10014 -- in the same declarative part. If in the private part
10015 -- this means that the type cannot be a Taft-amendment type.
10016 -- Check is done on package exit. For access to subprograms,
10017 -- the use is legal for Taft-amendment types.
10019 -- Ada 2012: tagged incomplete types are allowed as generic
10020 -- formal types. They do not introduce dependencies and the
10021 -- corresponding generic subprogram does not have a delayed
10022 -- freeze, because it does not need a freeze node. However,
10023 -- it is still the case that untagged incomplete types cannot
10024 -- be Taft-amendment types and must be completed in private
10025 -- part, so the subprogram must appear in the list of private
10026 -- dependents of the type.
10028 if Is_Tagged_Type
(Formal_Type
)
10029 or else (Ada_Version
>= Ada_2012
10030 and then not From_Limited_With
(Formal_Type
)
10031 and then not Is_Generic_Type
(Formal_Type
))
10033 if Ekind
(Scope
(Current_Scope
)) = E_Package
10034 and then not Is_Generic_Type
(Formal_Type
)
10035 and then not Is_Class_Wide_Type
(Formal_Type
)
10038 (Parent
(T
), N_Access_Function_Definition
,
10039 N_Access_Procedure_Definition
)
10043 To
=> Private_Dependents
(Base_Type
(Formal_Type
)));
10045 -- Freezing is delayed to ensure that Register_Prim
10046 -- will get called for this operation, which is needed
10047 -- in cases where static dispatch tables aren't built.
10048 -- (Note that the same is done for controlling access
10049 -- parameter cases in function Access_Definition.)
10051 if not Is_Thunk
(Current_Scope
) then
10052 Set_Has_Delayed_Freeze
(Current_Scope
);
10057 -- Special handling of Value_Type for CIL case
10059 elsif Is_Value_Type
(Formal_Type
) then
10062 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
10063 N_Access_Procedure_Definition
)
10065 -- AI05-0151: Tagged incomplete types are allowed in all
10066 -- formal parts. Untagged incomplete types are not allowed
10067 -- in bodies. Limited views of either kind are not allowed
10068 -- if there is no place at which the non-limited view can
10069 -- become available.
10071 -- Incomplete formal untagged types are not allowed in
10072 -- subprogram bodies (but are legal in their declarations).
10074 if Is_Generic_Type
(Formal_Type
)
10075 and then not Is_Tagged_Type
(Formal_Type
)
10076 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
10079 ("invalid use of formal incomplete type", Param_Spec
);
10081 elsif Ada_Version
>= Ada_2012
then
10082 if Is_Tagged_Type
(Formal_Type
)
10083 and then (not From_Limited_With
(Formal_Type
)
10084 or else not In_Package_Body
)
10088 elsif Nkind_In
(Parent
(Parent
(T
)), N_Accept_Statement
,
10089 N_Accept_Alternative
,
10094 ("invalid use of untagged incomplete type&",
10095 Ptype
, Formal_Type
);
10100 ("invalid use of incomplete type&",
10101 Param_Spec
, Formal_Type
);
10103 -- Further checks on the legality of incomplete types
10104 -- in formal parts are delayed until the freeze point
10105 -- of the enclosing subprogram or access to subprogram.
10109 elsif Ekind
(Formal_Type
) = E_Void
then
10111 ("premature use of&",
10112 Parameter_Type
(Param_Spec
), Formal_Type
);
10115 -- Ada 2012 (AI-142): Handle aliased parameters
10117 if Ada_Version
>= Ada_2012
10118 and then Aliased_Present
(Param_Spec
)
10120 Set_Is_Aliased
(Formal
);
10123 -- Ada 2005 (AI-231): Create and decorate an internal subtype
10124 -- declaration corresponding to the null-excluding type of the
10125 -- formal in the enclosing scope. Finally, replace the parameter
10126 -- type of the formal with the internal subtype.
10128 if Ada_Version
>= Ada_2005
10129 and then Null_Exclusion_Present
(Param_Spec
)
10131 if not Is_Access_Type
(Formal_Type
) then
10133 ("`NOT NULL` allowed only for an access type", Param_Spec
);
10136 if Can_Never_Be_Null
(Formal_Type
)
10137 and then Comes_From_Source
(Related_Nod
)
10140 ("`NOT NULL` not allowed (& already excludes null)",
10141 Param_Spec
, Formal_Type
);
10145 Create_Null_Excluding_Itype
10147 Related_Nod
=> Related_Nod
,
10148 Scope_Id
=> Scope
(Current_Scope
));
10150 -- If the designated type of the itype is an itype that is
10151 -- not frozen yet, we set the Has_Delayed_Freeze attribute
10152 -- on the access subtype, to prevent order-of-elaboration
10153 -- issues in the backend.
10156 -- type T is access procedure;
10157 -- procedure Op (O : not null T);
10159 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
10161 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
10163 Set_Has_Delayed_Freeze
(Formal_Type
);
10168 -- An access formal type
10172 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
10174 -- No need to continue if we already notified errors
10176 if not Present
(Formal_Type
) then
10180 -- Ada 2005 (AI-254)
10183 AD
: constant Node_Id
:=
10184 Access_To_Subprogram_Definition
10185 (Parameter_Type
(Param_Spec
));
10187 if Present
(AD
) and then Protected_Present
(AD
) then
10189 Replace_Anonymous_Access_To_Protected_Subprogram
10195 Set_Etype
(Formal
, Formal_Type
);
10197 -- Deal with default expression if present
10199 Default
:= Expression
(Param_Spec
);
10201 if Present
(Default
) then
10202 Check_SPARK_05_Restriction
10203 ("default expression is not allowed", Default
);
10205 if Out_Present
(Param_Spec
) then
10207 ("default initialization only allowed for IN parameters",
10211 -- Do the special preanalysis of the expression (see section on
10212 -- "Handling of Default Expressions" in the spec of package Sem).
10214 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
10216 -- An access to constant cannot be the default for
10217 -- an access parameter that is an access to variable.
10219 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10220 and then not Is_Access_Constant
(Formal_Type
)
10221 and then Is_Access_Type
(Etype
(Default
))
10222 and then Is_Access_Constant
(Etype
(Default
))
10225 ("formal that is access to variable cannot be initialized "
10226 & "with an access-to-constant expression", Default
);
10229 -- Check that the designated type of an access parameter's default
10230 -- is not a class-wide type unless the parameter's designated type
10231 -- is also class-wide.
10233 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10234 and then not Designates_From_Limited_With
(Formal_Type
)
10235 and then Is_Class_Wide_Default
(Default
)
10236 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
10239 ("access to class-wide expression not allowed here", Default
);
10242 -- Check incorrect use of dynamically tagged expressions
10244 if Is_Tagged_Type
(Formal_Type
) then
10245 Check_Dynamically_Tagged_Expression
10247 Typ
=> Formal_Type
,
10248 Related_Nod
=> Default
);
10252 -- Ada 2005 (AI-231): Static checks
10254 if Ada_Version
>= Ada_2005
10255 and then Is_Access_Type
(Etype
(Formal
))
10256 and then Can_Never_Be_Null
(Etype
(Formal
))
10258 Null_Exclusion_Static_Checks
(Param_Spec
);
10261 -- The following checks are relevant when SPARK_Mode is on as these
10262 -- are not standard Ada legality rules.
10264 if SPARK_Mode
= On
then
10265 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
10267 -- A function cannot have a parameter of mode IN OUT or OUT
10270 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
10272 ("function cannot have parameter of mode `OUT` or "
10273 & "`IN OUT`", Formal
);
10275 -- A function cannot have an effectively volatile formal
10276 -- parameter (SPARK RM 7.1.3(10)).
10278 elsif Is_Effectively_Volatile
(Formal
) then
10280 ("function cannot have a volatile formal parameter",
10284 -- A procedure cannot have an effectively volatile formal
10285 -- parameter of mode IN because it behaves as a constant
10286 -- (SPARK RM 7.1.3(6)).
10288 elsif Ekind
(Scope
(Formal
)) = E_Procedure
10289 and then Ekind
(Formal
) = E_In_Parameter
10290 and then Is_Effectively_Volatile
(Formal
)
10293 ("formal parameter of mode `IN` cannot be volatile", Formal
);
10301 -- If this is the formal part of a function specification, analyze the
10302 -- subtype mark in the context where the formals are visible but not
10303 -- yet usable, and may hide outer homographs.
10305 if Nkind
(Related_Nod
) = N_Function_Specification
then
10306 Analyze_Return_Type
(Related_Nod
);
10309 -- Now set the kind (mode) of each formal
10311 Param_Spec
:= First
(T
);
10312 while Present
(Param_Spec
) loop
10313 Formal
:= Defining_Identifier
(Param_Spec
);
10314 Set_Formal_Mode
(Formal
);
10316 if Ekind
(Formal
) = E_In_Parameter
then
10317 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
10319 if Present
(Expression
(Param_Spec
)) then
10320 Default
:= Expression
(Param_Spec
);
10322 if Is_Scalar_Type
(Etype
(Default
)) then
10323 if Nkind
(Parameter_Type
(Param_Spec
)) /=
10324 N_Access_Definition
10326 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
10330 (Related_Nod
, Parameter_Type
(Param_Spec
));
10333 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
10337 elsif Ekind
(Formal
) = E_Out_Parameter
then
10338 Num_Out_Params
:= Num_Out_Params
+ 1;
10340 if Num_Out_Params
= 1 then
10341 First_Out_Param
:= Formal
;
10344 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
10345 Num_Out_Params
:= Num_Out_Params
+ 1;
10348 -- Skip remaining processing if formal type was in error
10350 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
10351 goto Next_Parameter
;
10354 -- Force call by reference if aliased
10356 if Is_Aliased
(Formal
) then
10357 Set_Mechanism
(Formal
, By_Reference
);
10359 -- Warn if user asked this to be passed by copy
10361 if Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10363 ("cannot pass aliased parameter & by copy??", Formal
);
10366 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
10368 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10369 Set_Mechanism
(Formal
, By_Copy
);
10371 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Reference
then
10372 Set_Mechanism
(Formal
, By_Reference
);
10379 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
10380 Set_Is_Only_Out_Parameter
(First_Out_Param
);
10382 end Process_Formals
;
10384 ----------------------------
10385 -- Reference_Body_Formals --
10386 ----------------------------
10388 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
10393 if Error_Posted
(Spec
) then
10397 -- Iterate over both lists. They may be of different lengths if the two
10398 -- specs are not conformant.
10400 Fs
:= First_Formal
(Spec
);
10401 Fb
:= First_Formal
(Bod
);
10402 while Present
(Fs
) and then Present
(Fb
) loop
10403 Generate_Reference
(Fs
, Fb
, 'b');
10405 if Style_Check
then
10406 Style
.Check_Identifier
(Fb
, Fs
);
10409 Set_Spec_Entity
(Fb
, Fs
);
10410 Set_Referenced
(Fs
, False);
10414 end Reference_Body_Formals
;
10416 -------------------------
10417 -- Set_Actual_Subtypes --
10418 -------------------------
10420 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
10422 Formal
: Entity_Id
;
10424 First_Stmt
: Node_Id
:= Empty
;
10425 AS_Needed
: Boolean;
10428 -- If this is an empty initialization procedure, no need to create
10429 -- actual subtypes (small optimization).
10431 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
10435 Formal
:= First_Formal
(Subp
);
10436 while Present
(Formal
) loop
10437 T
:= Etype
(Formal
);
10439 -- We never need an actual subtype for a constrained formal
10441 if Is_Constrained
(T
) then
10442 AS_Needed
:= False;
10444 -- If we have unknown discriminants, then we do not need an actual
10445 -- subtype, or more accurately we cannot figure it out. Note that
10446 -- all class-wide types have unknown discriminants.
10448 elsif Has_Unknown_Discriminants
(T
) then
10449 AS_Needed
:= False;
10451 -- At this stage we have an unconstrained type that may need an
10452 -- actual subtype. For sure the actual subtype is needed if we have
10453 -- an unconstrained array type.
10455 elsif Is_Array_Type
(T
) then
10458 -- The only other case needing an actual subtype is an unconstrained
10459 -- record type which is an IN parameter (we cannot generate actual
10460 -- subtypes for the OUT or IN OUT case, since an assignment can
10461 -- change the discriminant values. However we exclude the case of
10462 -- initialization procedures, since discriminants are handled very
10463 -- specially in this context, see the section entitled "Handling of
10464 -- Discriminants" in Einfo.
10466 -- We also exclude the case of Discrim_SO_Functions (functions used
10467 -- in front end layout mode for size/offset values), since in such
10468 -- functions only discriminants are referenced, and not only are such
10469 -- subtypes not needed, but they cannot always be generated, because
10470 -- of order of elaboration issues.
10472 elsif Is_Record_Type
(T
)
10473 and then Ekind
(Formal
) = E_In_Parameter
10474 and then Chars
(Formal
) /= Name_uInit
10475 and then not Is_Unchecked_Union
(T
)
10476 and then not Is_Discrim_SO_Function
(Subp
)
10480 -- All other cases do not need an actual subtype
10483 AS_Needed
:= False;
10486 -- Generate actual subtypes for unconstrained arrays and
10487 -- unconstrained discriminated records.
10490 if Nkind
(N
) = N_Accept_Statement
then
10492 -- If expansion is active, the formal is replaced by a local
10493 -- variable that renames the corresponding entry of the
10494 -- parameter block, and it is this local variable that may
10495 -- require an actual subtype.
10497 if Expander_Active
then
10498 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
10500 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10503 if Present
(Handled_Statement_Sequence
(N
)) then
10505 First
(Statements
(Handled_Statement_Sequence
(N
)));
10506 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
10507 Mark_Rewrite_Insertion
(Decl
);
10509 -- If the accept statement has no body, there will be no
10510 -- reference to the actuals, so no need to compute actual
10517 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10518 Prepend
(Decl
, Declarations
(N
));
10519 Mark_Rewrite_Insertion
(Decl
);
10522 -- The declaration uses the bounds of an existing object, and
10523 -- therefore needs no constraint checks.
10525 Analyze
(Decl
, Suppress
=> All_Checks
);
10527 -- We need to freeze manually the generated type when it is
10528 -- inserted anywhere else than in a declarative part.
10530 if Present
(First_Stmt
) then
10531 Insert_List_Before_And_Analyze
(First_Stmt
,
10532 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10534 -- Ditto if the type has a dynamic predicate, because the
10535 -- generated function will mention the actual subtype.
10537 elsif Has_Dynamic_Predicate_Aspect
(T
) then
10538 Insert_List_Before_And_Analyze
(Decl
,
10539 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10542 if Nkind
(N
) = N_Accept_Statement
10543 and then Expander_Active
10545 Set_Actual_Subtype
(Renamed_Object
(Formal
),
10546 Defining_Identifier
(Decl
));
10548 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
10552 Next_Formal
(Formal
);
10554 end Set_Actual_Subtypes
;
10556 ---------------------
10557 -- Set_Formal_Mode --
10558 ---------------------
10560 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
10561 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
10564 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
10565 -- since we ensure that corresponding actuals are always valid at the
10566 -- point of the call.
10568 if Out_Present
(Spec
) then
10569 if Ekind_In
(Scope
(Formal_Id
), E_Function
, E_Generic_Function
) then
10571 -- [IN] OUT parameters allowed for functions in Ada 2012
10573 if Ada_Version
>= Ada_2012
then
10575 -- Even in Ada 2012 operators can only have IN parameters
10577 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
10578 Error_Msg_N
("operators can only have IN parameters", Spec
);
10581 if In_Present
(Spec
) then
10582 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10584 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10587 Set_Has_Out_Or_In_Out_Parameter
(Scope
(Formal_Id
), True);
10589 -- But not in earlier versions of Ada
10592 Error_Msg_N
("functions can only have IN parameters", Spec
);
10593 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10596 elsif In_Present
(Spec
) then
10597 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10600 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10601 Set_Never_Set_In_Source
(Formal_Id
, True);
10602 Set_Is_True_Constant
(Formal_Id
, False);
10603 Set_Current_Value
(Formal_Id
, Empty
);
10607 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10610 -- Set Is_Known_Non_Null for access parameters since the language
10611 -- guarantees that access parameters are always non-null. We also set
10612 -- Can_Never_Be_Null, since there is no way to change the value.
10614 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
10616 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
10617 -- null; In Ada 2005, only if then null_exclusion is explicit.
10619 if Ada_Version
< Ada_2005
10620 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
10622 Set_Is_Known_Non_Null
(Formal_Id
);
10623 Set_Can_Never_Be_Null
(Formal_Id
);
10626 -- Ada 2005 (AI-231): Null-exclusion access subtype
10628 elsif Is_Access_Type
(Etype
(Formal_Id
))
10629 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
10631 Set_Is_Known_Non_Null
(Formal_Id
);
10633 -- We can also set Can_Never_Be_Null (thus preventing some junk
10634 -- access checks) for the case of an IN parameter, which cannot
10635 -- be changed, or for an IN OUT parameter, which can be changed but
10636 -- not to a null value. But for an OUT parameter, the initial value
10637 -- passed in can be null, so we can't set this flag in that case.
10639 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
10640 Set_Can_Never_Be_Null
(Formal_Id
);
10644 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
10645 Set_Formal_Validity
(Formal_Id
);
10646 end Set_Formal_Mode
;
10648 -------------------------
10649 -- Set_Formal_Validity --
10650 -------------------------
10652 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
10654 -- If no validity checking, then we cannot assume anything about the
10655 -- validity of parameters, since we do not know there is any checking
10656 -- of the validity on the call side.
10658 if not Validity_Checks_On
then
10661 -- If validity checking for parameters is enabled, this means we are
10662 -- not supposed to make any assumptions about argument values.
10664 elsif Validity_Check_Parameters
then
10667 -- If we are checking in parameters, we will assume that the caller is
10668 -- also checking parameters, so we can assume the parameter is valid.
10670 elsif Ekind
(Formal_Id
) = E_In_Parameter
10671 and then Validity_Check_In_Params
10673 Set_Is_Known_Valid
(Formal_Id
, True);
10675 -- Similar treatment for IN OUT parameters
10677 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
10678 and then Validity_Check_In_Out_Params
10680 Set_Is_Known_Valid
(Formal_Id
, True);
10682 end Set_Formal_Validity
;
10684 ------------------------
10685 -- Subtype_Conformant --
10686 ------------------------
10688 function Subtype_Conformant
10689 (New_Id
: Entity_Id
;
10690 Old_Id
: Entity_Id
;
10691 Skip_Controlling_Formals
: Boolean := False) return Boolean
10695 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
10696 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10698 end Subtype_Conformant
;
10700 ---------------------
10701 -- Type_Conformant --
10702 ---------------------
10704 function Type_Conformant
10705 (New_Id
: Entity_Id
;
10706 Old_Id
: Entity_Id
;
10707 Skip_Controlling_Formals
: Boolean := False) return Boolean
10711 May_Hide_Profile
:= False;
10713 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
10714 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10716 end Type_Conformant
;
10718 -------------------------------
10719 -- Valid_Operator_Definition --
10720 -------------------------------
10722 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
10725 Id
: constant Name_Id
:= Chars
(Designator
);
10729 F
:= First_Formal
(Designator
);
10730 while Present
(F
) loop
10733 if Present
(Default_Value
(F
)) then
10735 ("default values not allowed for operator parameters",
10738 -- For function instantiations that are operators, we must check
10739 -- separately that the corresponding generic only has in-parameters.
10740 -- For subprogram declarations this is done in Set_Formal_Mode. Such
10741 -- an error could not arise in earlier versions of the language.
10743 elsif Ekind
(F
) /= E_In_Parameter
then
10744 Error_Msg_N
("operators can only have IN parameters", F
);
10750 -- Verify that user-defined operators have proper number of arguments
10751 -- First case of operators which can only be unary
10753 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
10756 -- Case of operators which can be unary or binary
10758 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
10759 N_OK
:= (N
in 1 .. 2);
10761 -- All other operators can only be binary
10769 ("incorrect number of arguments for operator", Designator
);
10773 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
10774 and then not Is_Intrinsic_Subprogram
(Designator
)
10777 ("explicit definition of inequality not allowed", Designator
);
10779 end Valid_Operator_Definition
;