1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Debug
; use Debug
;
30 with Einfo
; use Einfo
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
33 with Expander
; use Expander
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Dbug
; use Exp_Dbug
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Tss
; use Exp_Tss
;
40 with Exp_Util
; use Exp_Util
;
41 with Fname
; use Fname
;
42 with Freeze
; use Freeze
;
43 with Ghost
; use Ghost
;
44 with Inline
; use Inline
;
45 with Itypes
; use Itypes
;
46 with Lib
.Xref
; use Lib
.Xref
;
47 with Layout
; use Layout
;
48 with Namet
; use Namet
;
50 with Nlists
; use Nlists
;
51 with Nmake
; use Nmake
;
53 with Output
; use Output
;
54 with Restrict
; use Restrict
;
55 with Rident
; use Rident
;
56 with Rtsfind
; use Rtsfind
;
58 with Sem_Aux
; use Sem_Aux
;
59 with Sem_Cat
; use Sem_Cat
;
60 with Sem_Ch3
; use Sem_Ch3
;
61 with Sem_Ch4
; use Sem_Ch4
;
62 with Sem_Ch5
; use Sem_Ch5
;
63 with Sem_Ch8
; use Sem_Ch8
;
64 with Sem_Ch10
; use Sem_Ch10
;
65 with Sem_Ch12
; use Sem_Ch12
;
66 with Sem_Ch13
; use Sem_Ch13
;
67 with Sem_Dim
; use Sem_Dim
;
68 with Sem_Disp
; use Sem_Disp
;
69 with Sem_Dist
; use Sem_Dist
;
70 with Sem_Elim
; use Sem_Elim
;
71 with Sem_Eval
; use Sem_Eval
;
72 with Sem_Mech
; use Sem_Mech
;
73 with Sem_Prag
; use Sem_Prag
;
74 with Sem_Res
; use Sem_Res
;
75 with Sem_Util
; use Sem_Util
;
76 with Sem_Type
; use Sem_Type
;
77 with Sem_Warn
; use Sem_Warn
;
78 with Sinput
; use Sinput
;
79 with Stand
; use Stand
;
80 with Sinfo
; use Sinfo
;
81 with Sinfo
.CN
; use Sinfo
.CN
;
82 with Snames
; use Snames
;
83 with Stringt
; use Stringt
;
85 with Stylesw
; use Stylesw
;
86 with Targparm
; use Targparm
;
87 with Tbuild
; use Tbuild
;
88 with Uintp
; use Uintp
;
89 with Urealp
; use Urealp
;
90 with Validsw
; use Validsw
;
92 package body Sem_Ch6
is
94 May_Hide_Profile
: Boolean := False;
95 -- This flag is used to indicate that two formals in two subprograms being
96 -- checked for conformance differ only in that one is an access parameter
97 -- while the other is of a general access type with the same designated
98 -- type. In this case, if the rest of the signatures match, a call to
99 -- either subprogram may be ambiguous, which is worth a warning. The flag
100 -- is set in Compatible_Types, and the warning emitted in
101 -- New_Overloaded_Entity.
103 -----------------------
104 -- Local Subprograms --
105 -----------------------
107 procedure Analyze_Function_Return
(N
: Node_Id
);
108 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
109 -- applies to a [generic] function.
111 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
112 -- Analyze a generic subprogram body. N is the body to be analyzed, and
113 -- Gen_Id is the defining entity Id for the corresponding spec.
115 procedure Analyze_Null_Procedure
117 Is_Completion
: out Boolean);
118 -- A null procedure can be a declaration or (Ada 2012) a completion
120 procedure Analyze_Return_Statement
(N
: Node_Id
);
121 -- Common processing for simple and extended return statements
123 procedure Analyze_Return_Type
(N
: Node_Id
);
124 -- Subsidiary to Process_Formals: analyze subtype mark in function
125 -- specification in a context where the formals are visible and hide
128 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
129 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
130 -- that we can use RETURN but not skip the debug output at the end.
132 function Can_Override_Operator
(Subp
: Entity_Id
) return Boolean;
133 -- Returns true if Subp can override a predefined operator.
135 procedure Check_Conformance
138 Ctype
: Conformance_Type
;
140 Conforms
: out Boolean;
141 Err_Loc
: Node_Id
:= Empty
;
142 Get_Inst
: Boolean := False;
143 Skip_Controlling_Formals
: Boolean := False);
144 -- Given two entities, this procedure checks that the profiles associated
145 -- with these entities meet the conformance criterion given by the third
146 -- parameter. If they conform, Conforms is set True and control returns
147 -- to the caller. If they do not conform, Conforms is set to False, and
148 -- in addition, if Errmsg is True on the call, proper messages are output
149 -- to complain about the conformance failure. If Err_Loc is non_Empty
150 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
151 -- error messages are placed on the appropriate part of the construct
152 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
153 -- against a formal access-to-subprogram type so Get_Instance_Of must
156 procedure Check_Subprogram_Order
(N
: Node_Id
);
157 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
158 -- the alpha ordering rule for N if this ordering requirement applicable.
160 procedure Check_Returns
164 Proc
: Entity_Id
:= Empty
);
165 -- Called to check for missing return statements in a function body, or for
166 -- returns present in a procedure body which has No_Return set. HSS is the
167 -- handled statement sequence for the subprogram body. This procedure
168 -- checks all flow paths to make sure they either have return (Mode = 'F',
169 -- used for functions) or do not have a return (Mode = 'P', used for
170 -- No_Return procedures). The flag Err is set if there are any control
171 -- paths not explicitly terminated by a return in the function case, and is
172 -- True otherwise. Proc is the entity for the procedure case and is used
173 -- in posting the warning message.
175 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
176 -- In Ada 2012, a primitive equality operator on an untagged record type
177 -- must appear before the type is frozen, and have the same visibility as
178 -- that of the type. This procedure checks that this rule is met, and
179 -- otherwise emits an error on the subprogram declaration and a warning
180 -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode,
181 -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier
182 -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility
183 -- is set, otherwise the call has no effect.
185 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
186 -- This procedure makes S, a new overloaded entity, into the first visible
187 -- entity with that name.
189 function Is_Non_Overriding_Operation
191 New_E
: Entity_Id
) return Boolean;
192 -- Enforce the rule given in 12.3(18): a private operation in an instance
193 -- overrides an inherited operation only if the corresponding operation
194 -- was overriding in the generic. This needs to be checked for primitive
195 -- operations of types derived (in the generic unit) from formal private
196 -- or formal derived types.
198 procedure Make_Inequality_Operator
(S
: Entity_Id
);
199 -- Create the declaration for an inequality operator that is implicitly
200 -- created by a user-defined equality operator that yields a boolean.
202 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
203 -- Formal_Id is an formal parameter entity. This procedure deals with
204 -- setting the proper validity status for this entity, which depends on
205 -- the kind of parameter and the validity checking mode.
207 ---------------------------------------------
208 -- Analyze_Abstract_Subprogram_Declaration --
209 ---------------------------------------------
211 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
212 Designator
: constant Entity_Id
:=
213 Analyze_Subprogram_Specification
(Specification
(N
));
214 Scop
: constant Entity_Id
:= Current_Scope
;
217 -- The abstract subprogram declaration may be subject to pragma Ghost
218 -- with policy Ignore. Set the mode now to ensure that any nodes
219 -- generated during analysis and expansion are properly flagged as
223 Check_SPARK_05_Restriction
("abstract subprogram is not allowed", N
);
225 Generate_Definition
(Designator
);
227 Set_Is_Abstract_Subprogram
(Designator
);
228 New_Overloaded_Entity
(Designator
);
229 Check_Delayed_Subprogram
(Designator
);
231 Set_Categorization_From_Scope
(Designator
, Scop
);
233 -- An abstract subprogram declared within a Ghost region is rendered
234 -- Ghost (SPARK RM 6.9(2)).
236 if Comes_From_Source
(Designator
) and then Ghost_Mode
> None
then
237 Set_Is_Ghost_Entity
(Designator
);
240 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
242 ("abstract subprogram not allowed in protected type", N
);
244 -- Issue a warning if the abstract subprogram is neither a dispatching
245 -- operation nor an operation that overrides an inherited subprogram or
246 -- predefined operator, since this most likely indicates a mistake.
248 elsif Warn_On_Redundant_Constructs
249 and then not Is_Dispatching_Operation
(Designator
)
250 and then not Present
(Overridden_Operation
(Designator
))
251 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
252 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
255 ("abstract subprogram is not dispatching or overriding?r?", N
);
258 Generate_Reference_To_Formals
(Designator
);
259 Check_Eliminated
(Designator
);
261 if Has_Aspects
(N
) then
262 Analyze_Aspect_Specifications
(N
, Designator
);
264 end Analyze_Abstract_Subprogram_Declaration
;
266 ---------------------------------
267 -- Analyze_Expression_Function --
268 ---------------------------------
270 procedure Analyze_Expression_Function
(N
: Node_Id
) is
271 Expr
: constant Node_Id
:= Expression
(N
);
272 Loc
: constant Source_Ptr
:= Sloc
(N
);
273 LocX
: constant Source_Ptr
:= Sloc
(Expr
);
274 Spec
: constant Node_Id
:= Specification
(N
);
279 -- If the expression is a completion, Prev is the entity whose
280 -- declaration is completed. Def_Id is needed to analyze the spec.
287 -- This is one of the occasions on which we transform the tree during
288 -- semantic analysis. If this is a completion, transform the expression
289 -- function into an equivalent subprogram body, and analyze it.
291 -- Expression functions are inlined unconditionally. The back-end will
292 -- determine whether this is possible.
294 Inline_Processing_Required
:= True;
296 -- Create a specification for the generated body. This must be done
297 -- prior to the analysis of the initial declaration.
299 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
300 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
302 -- If there are previous overloadable entities with the same name,
303 -- check whether any of them is completed by the expression function.
304 -- In a generic context a formal subprogram has no completion.
307 and then Is_Overloadable
(Prev
)
308 and then not Is_Formal_Subprogram
(Prev
)
310 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
311 Prev
:= Find_Corresponding_Spec
(N
);
313 -- The previous entity may be an expression function as well, in
314 -- which case the redeclaration is illegal.
317 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
318 N_Expression_Function
320 Error_Msg_Sloc
:= Sloc
(Prev
);
321 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
326 Ret
:= Make_Simple_Return_Statement
(LocX
, Expression
(N
));
329 Make_Subprogram_Body
(Loc
,
330 Specification
=> New_Spec
,
331 Declarations
=> Empty_List
,
332 Handled_Statement_Sequence
=>
333 Make_Handled_Sequence_Of_Statements
(LocX
,
334 Statements
=> New_List
(Ret
)));
336 -- If the expression completes a generic subprogram, we must create a
337 -- separate node for the body, because at instantiation the original
338 -- node of the generic copy must be a generic subprogram body, and
339 -- cannot be a expression function. Otherwise we just rewrite the
340 -- expression with the non-generic body.
342 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
343 Insert_After
(N
, New_Body
);
345 -- Propagate any aspects or pragmas that apply to the expression
346 -- function to the proper body when the expression function acts
349 if Has_Aspects
(N
) then
350 Move_Aspects
(N
, To
=> New_Body
);
353 Relocate_Pragmas_To_Body
(New_Body
);
355 Rewrite
(N
, Make_Null_Statement
(Loc
));
356 Set_Has_Completion
(Prev
, False);
359 Set_Is_Inlined
(Prev
);
361 -- If the expression function is a completion, the previous declaration
362 -- must come from source. We know already that appears in the current
363 -- scope. The entity itself may be internally created if within a body
367 and then Comes_From_Source
(Parent
(Prev
))
368 and then not Is_Formal_Subprogram
(Prev
)
370 Set_Has_Completion
(Prev
, False);
372 -- An expression function that is a completion freezes the
373 -- expression. This means freezing the return type, and if it is
374 -- an access type, freezing its designated type as well.
376 -- Note that we cannot defer this freezing to the analysis of the
377 -- expression itself, because a freeze node might appear in a nested
378 -- scope, leading to an elaboration order issue in gigi.
380 Freeze_Before
(N
, Etype
(Prev
));
382 if Is_Access_Type
(Etype
(Prev
)) then
383 Freeze_Before
(N
, Designated_Type
(Etype
(Prev
)));
386 -- For navigation purposes, indicate that the function is a body
388 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
389 Rewrite
(N
, New_Body
);
391 -- Correct the parent pointer of the aspect specification list to
392 -- reference the rewritten node.
394 if Has_Aspects
(N
) then
395 Set_Parent
(Aspect_Specifications
(N
), N
);
398 -- Propagate any pragmas that apply to the expression function to the
399 -- proper body when the expression function acts as a completion.
400 -- Aspects are automatically transfered because of node rewriting.
402 Relocate_Pragmas_To_Body
(N
);
405 -- Prev is the previous entity with the same name, but it is can
406 -- be an unrelated spec that is not completed by the expression
407 -- function. In that case the relevant entity is the one in the body.
408 -- Not clear that the backend can inline it in this case ???
410 if Has_Completion
(Prev
) then
411 Set_Is_Inlined
(Prev
);
413 -- The formals of the expression function are body formals,
414 -- and do not appear in the ali file, which will only contain
415 -- references to the formals of the original subprogram spec.
422 F1
:= First_Formal
(Def_Id
);
423 F2
:= First_Formal
(Prev
);
425 while Present
(F1
) loop
426 Set_Spec_Entity
(F1
, F2
);
433 Set_Is_Inlined
(Defining_Entity
(New_Body
));
436 -- If this is not a completion, create both a declaration and a body, so
437 -- that the expression can be inlined whenever possible.
440 -- An expression function that is not a completion is not a
441 -- subprogram declaration, and thus cannot appear in a protected
444 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
446 ("an expression function is not a legal protected operation", N
);
449 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
451 -- Correct the parent pointer of the aspect specification list to
452 -- reference the rewritten node.
454 if Has_Aspects
(N
) then
455 Set_Parent
(Aspect_Specifications
(N
), N
);
460 -- Within a generic pre-analyze the original expression for name
461 -- capture. The body is also generated but plays no role in
462 -- this because it is not part of the original source.
464 if Inside_A_Generic
then
466 Id
: constant Entity_Id
:= Defining_Entity
(N
);
469 Set_Has_Completion
(Id
);
471 Install_Formals
(Id
);
472 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
477 Set_Is_Inlined
(Defining_Entity
(N
));
479 -- Establish the linkages between the spec and the body. These are
480 -- used when the expression function acts as the prefix of attribute
481 -- 'Access in order to freeze the original expression which has been
482 -- moved to the generated body.
484 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
485 Set_Corresponding_Spec
(New_Body
, Defining_Entity
(N
));
487 -- To prevent premature freeze action, insert the new body at the end
488 -- of the current declarations, or at the end of the package spec.
489 -- However, resolve usage names now, to prevent spurious visibility
490 -- on later entities. Note that the function can now be called in
491 -- the current declarative part, which will appear to be prior to
492 -- the presence of the body in the code. There are nevertheless no
493 -- order of elaboration issues because all name resolution has taken
494 -- place at the point of declaration.
497 Decls
: List_Id
:= List_Containing
(N
);
498 Par
: constant Node_Id
:= Parent
(Decls
);
499 Id
: constant Entity_Id
:= Defining_Entity
(N
);
502 -- If this is a wrapper created for in an instance for a formal
503 -- subprogram, insert body after declaration, to be analyzed when
504 -- the enclosing instance is analyzed.
507 and then Is_Generic_Actual_Subprogram
(Defining_Entity
(N
))
509 Insert_After
(N
, New_Body
);
512 if Nkind
(Par
) = N_Package_Specification
513 and then Decls
= Visible_Declarations
(Par
)
514 and then Present
(Private_Declarations
(Par
))
515 and then not Is_Empty_List
(Private_Declarations
(Par
))
517 Decls
:= Private_Declarations
(Par
);
520 Insert_After
(Last
(Decls
), New_Body
);
522 Install_Formals
(Id
);
524 -- Preanalyze the expression for name capture, except in an
525 -- instance, where this has been done during generic analysis,
526 -- and will be redone when analyzing the body.
529 Expr
: constant Node_Id
:= Expression
(Ret
);
532 Set_Parent
(Expr
, Ret
);
534 if not In_Instance
then
535 Preanalyze_Spec_Expression
(Expr
, Etype
(Id
));
544 -- If the return expression is a static constant, we suppress warning
545 -- messages on unused formals, which in most cases will be noise.
547 Set_Is_Trivial_Subprogram
(Defining_Entity
(New_Body
),
548 Is_OK_Static_Expression
(Expr
));
549 end Analyze_Expression_Function
;
551 ----------------------------------------
552 -- Analyze_Extended_Return_Statement --
553 ----------------------------------------
555 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
557 Check_Compiler_Unit
("extended return statement", N
);
558 Analyze_Return_Statement
(N
);
559 end Analyze_Extended_Return_Statement
;
561 ----------------------------
562 -- Analyze_Function_Call --
563 ----------------------------
565 procedure Analyze_Function_Call
(N
: Node_Id
) is
566 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
567 Func_Nam
: constant Node_Id
:= Name
(N
);
573 -- A call of the form A.B (X) may be an Ada 2005 call, which is
574 -- rewritten as B (A, X). If the rewriting is successful, the call
575 -- has been analyzed and we just return.
577 if Nkind
(Func_Nam
) = N_Selected_Component
578 and then Name
(N
) /= Func_Nam
579 and then Is_Rewrite_Substitution
(N
)
580 and then Present
(Etype
(N
))
585 -- If error analyzing name, then set Any_Type as result type and return
587 if Etype
(Func_Nam
) = Any_Type
then
588 Set_Etype
(N
, Any_Type
);
592 -- Otherwise analyze the parameters
594 if Present
(Actuals
) then
595 Actual
:= First
(Actuals
);
596 while Present
(Actual
) loop
598 Check_Parameterless_Call
(Actual
);
604 end Analyze_Function_Call
;
606 -----------------------------
607 -- Analyze_Function_Return --
608 -----------------------------
610 procedure Analyze_Function_Return
(N
: Node_Id
) is
611 Loc
: constant Source_Ptr
:= Sloc
(N
);
612 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
613 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
615 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
616 -- Function result subtype
618 procedure Check_Limited_Return
(Expr
: Node_Id
);
619 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
620 -- limited types. Used only for simple return statements.
621 -- Expr is the expression returned.
623 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
624 -- Check that the return_subtype_indication properly matches the result
625 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
627 --------------------------
628 -- Check_Limited_Return --
629 --------------------------
631 procedure Check_Limited_Return
(Expr
: Node_Id
) is
633 -- Ada 2005 (AI-318-02): Return-by-reference types have been
634 -- removed and replaced by anonymous access results. This is an
635 -- incompatibility with Ada 95. Not clear whether this should be
636 -- enforced yet or perhaps controllable with special switch. ???
638 -- A limited interface that is not immutably limited is OK.
640 if Is_Limited_Interface
(R_Type
)
642 not (Is_Task_Interface
(R_Type
)
643 or else Is_Protected_Interface
(R_Type
)
644 or else Is_Synchronized_Interface
(R_Type
))
648 elsif Is_Limited_Type
(R_Type
)
649 and then not Is_Interface
(R_Type
)
650 and then Comes_From_Source
(N
)
651 and then not In_Instance_Body
652 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
656 if Ada_Version
>= Ada_2005
657 and then not Debug_Flag_Dot_L
658 and then not GNAT_Mode
661 ("(Ada 2005) cannot copy object of a limited type "
662 & "(RM-2005 6.5(5.5/2))", Expr
);
664 if Is_Limited_View
(R_Type
) then
666 ("\return by reference not permitted in Ada 2005", Expr
);
669 -- Warn in Ada 95 mode, to give folks a heads up about this
672 -- In GNAT mode, this is just a warning, to allow it to be
673 -- evilly turned off. Otherwise it is a real error.
675 -- In a generic context, simplify the warning because it makes
676 -- no sense to discuss pass-by-reference or copy.
678 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
679 if Inside_A_Generic
then
681 ("return of limited object not permitted in Ada 2005 "
682 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
684 elsif Is_Limited_View
(R_Type
) then
686 ("return by reference not permitted in Ada 2005 "
687 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
690 ("cannot copy object of a limited type in Ada 2005 "
691 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
694 -- Ada 95 mode, compatibility warnings disabled
697 return; -- skip continuation messages below
700 if not Inside_A_Generic
then
702 ("\consider switching to return of access type", Expr
);
703 Explain_Limited_Type
(R_Type
, Expr
);
706 end Check_Limited_Return
;
708 -------------------------------------
709 -- Check_Return_Subtype_Indication --
710 -------------------------------------
712 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
713 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
715 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
716 -- Subtype given in the extended return statement (must match R_Type)
718 Subtype_Ind
: constant Node_Id
:=
719 Object_Definition
(Original_Node
(Obj_Decl
));
721 R_Type_Is_Anon_Access
: constant Boolean :=
723 E_Anonymous_Access_Subprogram_Type
,
724 E_Anonymous_Access_Protected_Subprogram_Type
,
725 E_Anonymous_Access_Type
);
726 -- True if return type of the function is an anonymous access type
727 -- Can't we make Is_Anonymous_Access_Type in einfo ???
729 R_Stm_Type_Is_Anon_Access
: constant Boolean :=
730 Ekind_In
(R_Stm_Type
,
731 E_Anonymous_Access_Subprogram_Type
,
732 E_Anonymous_Access_Protected_Subprogram_Type
,
733 E_Anonymous_Access_Type
);
734 -- True if type of the return object is an anonymous access type
736 procedure Error_No_Match
(N
: Node_Id
);
737 -- Output error messages for case where types do not statically
738 -- match. N is the location for the messages.
744 procedure Error_No_Match
(N
: Node_Id
) is
747 ("subtype must statically match function result subtype", N
);
749 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
750 Error_Msg_Node_2
:= R_Type
;
752 ("\predicate of& does not match predicate of&",
757 -- Start of processing for Check_Return_Subtype_Indication
760 -- First, avoid cascaded errors
762 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
766 -- "return access T" case; check that the return statement also has
767 -- "access T", and that the subtypes statically match:
768 -- if this is an access to subprogram the signatures must match.
770 if R_Type_Is_Anon_Access
then
771 if R_Stm_Type_Is_Anon_Access
then
773 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
775 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
776 Base_Type
(Designated_Type
(R_Type
))
777 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
779 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
783 -- For two anonymous access to subprogram types, the
784 -- types themselves must be type conformant.
786 if not Conforming_Types
787 (R_Stm_Type
, R_Type
, Fully_Conformant
)
789 Error_No_Match
(Subtype_Ind
);
794 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
797 -- If the return object is of an anonymous access type, then report
798 -- an error if the function's result type is not also anonymous.
800 elsif R_Stm_Type_Is_Anon_Access
801 and then not R_Type_Is_Anon_Access
803 Error_Msg_N
("anonymous access not allowed for function with "
804 & "named access result", Subtype_Ind
);
806 -- Subtype indication case: check that the return object's type is
807 -- covered by the result type, and that the subtypes statically match
808 -- when the result subtype is constrained. Also handle record types
809 -- with unknown discriminants for which we have built the underlying
810 -- record view. Coverage is needed to allow specific-type return
811 -- objects when the result type is class-wide (see AI05-32).
813 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
814 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
818 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
820 -- A null exclusion may be present on the return type, on the
821 -- function specification, on the object declaration or on the
824 if Is_Access_Type
(R_Type
)
826 (Can_Never_Be_Null
(R_Type
)
827 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
828 Can_Never_Be_Null
(R_Stm_Type
)
830 Error_No_Match
(Subtype_Ind
);
833 -- AI05-103: for elementary types, subtypes must statically match
835 if Is_Constrained
(R_Type
)
836 or else Is_Access_Type
(R_Type
)
838 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
839 Error_No_Match
(Subtype_Ind
);
843 -- All remaining cases are illegal
845 -- Note: previous versions of this subprogram allowed the return
846 -- value to be the ancestor of the return type if the return type
847 -- was a null extension. This was plainly incorrect.
851 ("wrong type for return_subtype_indication", Subtype_Ind
);
853 end Check_Return_Subtype_Indication
;
855 ---------------------
856 -- Local Variables --
857 ---------------------
862 -- Start of processing for Analyze_Function_Return
865 Set_Return_Present
(Scope_Id
);
867 if Nkind
(N
) = N_Simple_Return_Statement
then
868 Expr
:= Expression
(N
);
870 -- Guard against a malformed expression. The parser may have tried to
871 -- recover but the node is not analyzable.
873 if Nkind
(Expr
) = N_Error
then
874 Set_Etype
(Expr
, Any_Type
);
875 Expander_Mode_Save_And_Set
(False);
879 -- The resolution of a controlled [extension] aggregate associated
880 -- with a return statement creates a temporary which needs to be
881 -- finalized on function exit. Wrap the return statement inside a
882 -- block so that the finalization machinery can detect this case.
883 -- This early expansion is done only when the return statement is
884 -- not part of a handled sequence of statements.
886 if Nkind_In
(Expr
, N_Aggregate
,
887 N_Extension_Aggregate
)
888 and then Needs_Finalization
(R_Type
)
889 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
892 Make_Block_Statement
(Loc
,
893 Handled_Statement_Sequence
=>
894 Make_Handled_Sequence_Of_Statements
(Loc
,
895 Statements
=> New_List
(Relocate_Node
(N
)))));
903 -- Ada 2005 (AI-251): If the type of the returned object is
904 -- an access to an interface type then we add an implicit type
905 -- conversion to force the displacement of the "this" pointer to
906 -- reference the secondary dispatch table. We cannot delay the
907 -- generation of this implicit conversion until the expansion
908 -- because in this case the type resolution changes the decoration
909 -- of the expression node to match R_Type; by contrast, if the
910 -- returned object is a class-wide interface type then it is too
911 -- early to generate here the implicit conversion since the return
912 -- statement may be rewritten by the expander into an extended
913 -- return statement whose expansion takes care of adding the
914 -- implicit type conversion to displace the pointer to the object.
917 and then Serious_Errors_Detected
= 0
918 and then Is_Access_Type
(R_Type
)
919 and then Nkind
(Expr
) /= N_Null
920 and then Is_Interface
(Designated_Type
(R_Type
))
921 and then Is_Progenitor
(Designated_Type
(R_Type
),
922 Designated_Type
(Etype
(Expr
)))
924 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
928 Resolve
(Expr
, R_Type
);
929 Check_Limited_Return
(Expr
);
932 -- RETURN only allowed in SPARK as the last statement in function
934 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
936 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
937 or else Present
(Next
(N
)))
939 Check_SPARK_05_Restriction
940 ("RETURN should be the last statement in function", N
);
944 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
945 Obj_Decl
:= Last
(Return_Object_Declarations
(N
));
947 -- Analyze parts specific to extended_return_statement:
950 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
951 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
954 Expr
:= Expression
(Obj_Decl
);
956 -- Note: The check for OK_For_Limited_Init will happen in
957 -- Analyze_Object_Declaration; we treat it as a normal
958 -- object declaration.
960 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
963 Check_Return_Subtype_Indication
(Obj_Decl
);
965 if Present
(HSS
) then
968 if Present
(Exception_Handlers
(HSS
)) then
970 -- ???Has_Nested_Block_With_Handler needs to be set.
971 -- Probably by creating an actual N_Block_Statement.
972 -- Probably in Expand.
978 -- Mark the return object as referenced, since the return is an
979 -- implicit reference of the object.
981 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
983 Check_References
(Stm_Entity
);
985 -- Check RM 6.5 (5.9/3)
988 if Ada_Version
< Ada_2012
then
990 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
991 -- Can it really happen (extended return???)
994 ("aliased only allowed for limited return objects "
995 & "in Ada 2012??", N
);
997 elsif not Is_Limited_View
(R_Type
) then
999 ("aliased only allowed for limited return objects", N
);
1005 -- Case of Expr present
1009 -- Defend against previous errors
1011 and then Nkind
(Expr
) /= N_Empty
1012 and then Present
(Etype
(Expr
))
1014 -- Apply constraint check. Note that this is done before the implicit
1015 -- conversion of the expression done for anonymous access types to
1016 -- ensure correct generation of the null-excluding check associated
1017 -- with null-excluding expressions found in return statements.
1019 Apply_Constraint_Check
(Expr
, R_Type
);
1021 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1022 -- type, apply an implicit conversion of the expression to that type
1023 -- to force appropriate static and run-time accessibility checks.
1025 if Ada_Version
>= Ada_2005
1026 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1028 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1029 Analyze_And_Resolve
(Expr
, R_Type
);
1031 -- If this is a local anonymous access to subprogram, the
1032 -- accessibility check can be applied statically. The return is
1033 -- illegal if the access type of the return expression is declared
1034 -- inside of the subprogram (except if it is the subtype indication
1035 -- of an extended return statement).
1037 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1038 if not Comes_From_Source
(Current_Scope
)
1039 or else Ekind
(Current_Scope
) = E_Return_Statement
1044 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1046 Error_Msg_N
("cannot return local access to subprogram", N
);
1049 -- The expression cannot be of a formal incomplete type
1051 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1052 and then Is_Generic_Type
(Etype
(Expr
))
1055 ("cannot return expression of a formal incomplete type", N
);
1058 -- If the result type is class-wide, then check that the return
1059 -- expression's type is not declared at a deeper level than the
1060 -- function (RM05-6.5(5.6/2)).
1062 if Ada_Version
>= Ada_2005
1063 and then Is_Class_Wide_Type
(R_Type
)
1065 if Type_Access_Level
(Etype
(Expr
)) >
1066 Subprogram_Access_Level
(Scope_Id
)
1069 ("level of return expression type is deeper than "
1070 & "class-wide function!", Expr
);
1074 -- Check incorrect use of dynamically tagged expression
1076 if Is_Tagged_Type
(R_Type
) then
1077 Check_Dynamically_Tagged_Expression
1083 -- ??? A real run-time accessibility check is needed in cases
1084 -- involving dereferences of access parameters. For now we just
1085 -- check the static cases.
1087 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1088 and then Is_Limited_View
(Etype
(Scope_Id
))
1089 and then Object_Access_Level
(Expr
) >
1090 Subprogram_Access_Level
(Scope_Id
)
1092 -- Suppress the message in a generic, where the rewriting
1095 if Inside_A_Generic
then
1100 Make_Raise_Program_Error
(Loc
,
1101 Reason
=> PE_Accessibility_Check_Failed
));
1104 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1105 Error_Msg_N
("cannot return a local value by reference<<", N
);
1106 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1110 if Known_Null
(Expr
)
1111 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1112 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1114 Apply_Compile_Time_Constraint_Error
1116 Msg
=> "(Ada 2005) null not allowed for "
1117 & "null-excluding return??",
1118 Reason
=> CE_Null_Not_Allowed
);
1121 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1122 -- has no initializing expression.
1124 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1125 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1126 Subprogram_Access_Level
(Scope_Id
)
1129 ("level of return expression type is deeper than "
1130 & "class-wide function!", Obj_Decl
);
1133 end Analyze_Function_Return
;
1135 -------------------------------------
1136 -- Analyze_Generic_Subprogram_Body --
1137 -------------------------------------
1139 procedure Analyze_Generic_Subprogram_Body
1143 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1144 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1145 Body_Id
: Entity_Id
;
1150 -- Copy body and disable expansion while analyzing the generic For a
1151 -- stub, do not copy the stub (which would load the proper body), this
1152 -- will be done when the proper body is analyzed.
1154 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1155 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1158 -- Once the contents of the generic copy and the template are
1159 -- swapped, do the same for their respective aspect specifications.
1161 Exchange_Aspects
(N
, New_N
);
1163 -- Collect all contract-related source pragmas found within the
1164 -- template and attach them to the contract of the subprogram body.
1165 -- This contract is used in the capture of global references within
1168 Create_Generic_Contract
(N
);
1173 Spec
:= Specification
(N
);
1175 -- Within the body of the generic, the subprogram is callable, and
1176 -- behaves like the corresponding non-generic unit.
1178 Body_Id
:= Defining_Entity
(Spec
);
1180 if Kind
= E_Generic_Procedure
1181 and then Nkind
(Spec
) /= N_Procedure_Specification
1183 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1186 elsif Kind
= E_Generic_Function
1187 and then Nkind
(Spec
) /= N_Function_Specification
1189 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1193 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1195 if Has_Completion
(Gen_Id
)
1196 and then Nkind
(Parent
(N
)) /= N_Subunit
1198 Error_Msg_N
("duplicate generic body", N
);
1201 Set_Has_Completion
(Gen_Id
);
1204 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1205 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1207 Set_Corresponding_Spec
(N
, Gen_Id
);
1210 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1211 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1214 -- Make generic parameters immediately visible in the body. They are
1215 -- needed to process the formals declarations. Then make the formals
1216 -- visible in a separate step.
1218 Push_Scope
(Gen_Id
);
1222 First_Ent
: Entity_Id
;
1225 First_Ent
:= First_Entity
(Gen_Id
);
1228 while Present
(E
) and then not Is_Formal
(E
) loop
1233 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1235 -- Now generic formals are visible, and the specification can be
1236 -- analyzed, for subsequent conformance check.
1238 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1240 -- Make formal parameters visible
1244 -- E is the first formal parameter, we loop through the formals
1245 -- installing them so that they will be visible.
1247 Set_First_Entity
(Gen_Id
, E
);
1248 while Present
(E
) loop
1254 -- Visible generic entity is callable within its own body
1256 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1257 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1258 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1259 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1260 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1262 -- Inherit the "ghostness" of the generic spec. Note that this
1263 -- property is not directly inherited as the body may be subject
1264 -- to a different Ghost assertion policy.
1266 if Is_Ghost_Entity
(Gen_Id
) or else Ghost_Mode
> None
then
1267 Set_Is_Ghost_Entity
(Body_Id
);
1269 -- The Ghost policy in effect at the point of declaration and at
1270 -- the point of completion must match (SPARK RM 6.9(15)).
1272 Check_Ghost_Completion
(Gen_Id
, Body_Id
);
1275 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1277 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1279 -- No body to analyze, so restore state of generic unit
1281 Set_Ekind
(Gen_Id
, Kind
);
1282 Set_Ekind
(Body_Id
, Kind
);
1284 if Present
(First_Ent
) then
1285 Set_First_Entity
(Gen_Id
, First_Ent
);
1292 -- If this is a compilation unit, it must be made visible explicitly,
1293 -- because the compilation of the declaration, unlike other library
1294 -- unit declarations, does not. If it is not a unit, the following
1295 -- is redundant but harmless.
1297 Set_Is_Immediately_Visible
(Gen_Id
);
1298 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1300 if Is_Child_Unit
(Gen_Id
) then
1301 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1304 Set_Actual_Subtypes
(N
, Current_Scope
);
1306 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1307 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
1309 -- Analyze any aspect specifications that appear on the generic
1312 if Has_Aspects
(N
) then
1313 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
1316 Analyze_Declarations
(Declarations
(N
));
1319 -- When a generic subprogram body appears inside a package, its
1320 -- contract is analyzed at the end of the package body declarations.
1321 -- This is due to the delay with respect of the package contract upon
1322 -- which the body contract may depend. When the generic subprogram
1323 -- body is a compilation unit, this delay is not necessary.
1325 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1326 Analyze_Subprogram_Body_Contract
(Body_Id
);
1328 -- Capture all global references in a generic subprogram body
1329 -- that acts as a compilation unit now that the contract has
1332 Save_Global_References_In_Contract
1333 (Templ
=> Original_Node
(N
),
1337 Analyze
(Handled_Statement_Sequence
(N
));
1338 Save_Global_References
(Original_Node
(N
));
1340 -- Prior to exiting the scope, include generic formals again (if any
1341 -- are present) in the set of local entities.
1343 if Present
(First_Ent
) then
1344 Set_First_Entity
(Gen_Id
, First_Ent
);
1347 Check_References
(Gen_Id
);
1350 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1352 Check_Subprogram_Order
(N
);
1354 -- Outside of its body, unit is generic again
1356 Set_Ekind
(Gen_Id
, Kind
);
1357 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1360 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1364 end Analyze_Generic_Subprogram_Body
;
1366 ----------------------------
1367 -- Analyze_Null_Procedure --
1368 ----------------------------
1370 procedure Analyze_Null_Procedure
1372 Is_Completion
: out Boolean)
1374 Loc
: constant Source_Ptr
:= Sloc
(N
);
1375 Spec
: constant Node_Id
:= Specification
(N
);
1376 Designator
: Entity_Id
;
1378 Null_Body
: Node_Id
:= Empty
;
1382 -- Capture the profile of the null procedure before analysis, for
1383 -- expansion at the freeze point and at each point of call. The body is
1384 -- used if the procedure has preconditions, or if it is a completion. In
1385 -- the first case the body is analyzed at the freeze point, in the other
1386 -- it replaces the null procedure declaration.
1389 Make_Subprogram_Body
(Loc
,
1390 Specification
=> New_Copy_Tree
(Spec
),
1391 Declarations
=> New_List
,
1392 Handled_Statement_Sequence
=>
1393 Make_Handled_Sequence_Of_Statements
(Loc
,
1394 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
1396 -- Create new entities for body and formals
1398 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1399 Make_Defining_Identifier
1400 (Sloc
(Defining_Entity
(N
)),
1401 Chars
(Defining_Entity
(N
))));
1403 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1404 while Present
(Form
) loop
1405 Set_Defining_Identifier
(Form
,
1406 Make_Defining_Identifier
1407 (Sloc
(Defining_Identifier
(Form
)),
1408 Chars
(Defining_Identifier
(Form
))));
1412 -- Determine whether the null procedure may be a completion of a generic
1413 -- suprogram, in which case we use the new null body as the completion
1414 -- and set minimal semantic information on the original declaration,
1415 -- which is rewritten as a null statement.
1417 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1419 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1420 Insert_Before
(N
, Null_Body
);
1421 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1423 Rewrite
(N
, Make_Null_Statement
(Loc
));
1424 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1425 Is_Completion
:= True;
1429 -- Resolve the types of the formals now, because the freeze point
1430 -- may appear in a different context, e.g. an instantiation.
1432 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1433 while Present
(Form
) loop
1434 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1435 Find_Type
(Parameter_Type
(Form
));
1438 No
(Access_To_Subprogram_Definition
(Parameter_Type
(Form
)))
1440 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1443 -- The case of a null procedure with a formal that is an
1444 -- access_to_subprogram type, and that is used as an actual
1445 -- in an instantiation is left to the enthusiastic reader.
1454 -- If there are previous overloadable entities with the same name,
1455 -- check whether any of them is completed by the null procedure.
1457 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1458 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1459 Prev
:= Find_Corresponding_Spec
(N
);
1462 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1463 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1464 Set_Has_Completion
(Designator
);
1466 -- Signal to caller that this is a procedure declaration
1468 Is_Completion
:= False;
1470 -- Null procedures are always inlined, but generic formal subprograms
1471 -- which appear as such in the internal instance of formal packages,
1472 -- need no completion and are not marked Inline.
1475 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1477 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1478 Set_Body_To_Inline
(N
, Null_Body
);
1479 Set_Is_Inlined
(Designator
);
1483 -- The null procedure is a completion. We unconditionally rewrite
1484 -- this as a null body (even if expansion is not active), because
1485 -- there are various error checks that are applied on this body
1486 -- when it is analyzed (e.g. correct aspect placement).
1488 if Has_Completion
(Prev
) then
1489 Error_Msg_Sloc
:= Sloc
(Prev
);
1490 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1493 Is_Completion
:= True;
1494 Rewrite
(N
, Null_Body
);
1497 end Analyze_Null_Procedure
;
1499 -----------------------------
1500 -- Analyze_Operator_Symbol --
1501 -----------------------------
1503 -- An operator symbol such as "+" or "and" may appear in context where the
1504 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1505 -- is just a string, as in (conjunction = "or"). In these cases the parser
1506 -- generates this node, and the semantics does the disambiguation. Other
1507 -- such case are actuals in an instantiation, the generic unit in an
1508 -- instantiation, and pragma arguments.
1510 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1511 Par
: constant Node_Id
:= Parent
(N
);
1514 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1515 or else Nkind
(Par
) = N_Function_Instantiation
1516 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1517 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1518 and then not Is_Pragma_String_Literal
(Par
))
1519 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1520 or else (Nkind
(Par
) = N_Attribute_Reference
1521 and then Attribute_Name
(Par
) /= Name_Value
)
1523 Find_Direct_Name
(N
);
1526 Change_Operator_Symbol_To_String_Literal
(N
);
1529 end Analyze_Operator_Symbol
;
1531 -----------------------------------
1532 -- Analyze_Parameter_Association --
1533 -----------------------------------
1535 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1537 Analyze
(Explicit_Actual_Parameter
(N
));
1538 end Analyze_Parameter_Association
;
1540 ----------------------------
1541 -- Analyze_Procedure_Call --
1542 ----------------------------
1544 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1545 Loc
: constant Source_Ptr
:= Sloc
(N
);
1546 P
: constant Node_Id
:= Name
(N
);
1547 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1551 procedure Analyze_Call_And_Resolve
;
1552 -- Do Analyze and Resolve calls for procedure call
1553 -- At end, check illegal order dependence.
1555 ------------------------------
1556 -- Analyze_Call_And_Resolve --
1557 ------------------------------
1559 procedure Analyze_Call_And_Resolve
is
1561 if Nkind
(N
) = N_Procedure_Call_Statement
then
1563 Resolve
(N
, Standard_Void_Type
);
1567 end Analyze_Call_And_Resolve
;
1569 -- Start of processing for Analyze_Procedure_Call
1572 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1573 -- a procedure call or an entry call. The prefix may denote an access
1574 -- to subprogram type, in which case an implicit dereference applies.
1575 -- If the prefix is an indexed component (without implicit dereference)
1576 -- then the construct denotes a call to a member of an entire family.
1577 -- If the prefix is a simple name, it may still denote a call to a
1578 -- parameterless member of an entry family. Resolution of these various
1579 -- interpretations is delicate.
1583 -- If this is a call of the form Obj.Op, the call may have been
1584 -- analyzed and possibly rewritten into a block, in which case
1587 if Analyzed
(N
) then
1591 -- If there is an error analyzing the name (which may have been
1592 -- rewritten if the original call was in prefix notation) then error
1593 -- has been emitted already, mark node and return.
1595 if Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1596 Set_Etype
(N
, Any_Type
);
1600 -- The name of the procedure call may reference an entity subject to
1601 -- pragma Ghost with policy Ignore. Set the mode now to ensure that any
1602 -- nodes generated during analysis and expansion are properly flagged as
1607 -- Otherwise analyze the parameters
1609 if Present
(Actuals
) then
1610 Actual
:= First
(Actuals
);
1612 while Present
(Actual
) loop
1614 Check_Parameterless_Call
(Actual
);
1619 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1621 if Nkind
(P
) = N_Attribute_Reference
1622 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1624 Name_Elab_Subp_Body
)
1626 if Present
(Actuals
) then
1628 ("no parameters allowed for this call", First
(Actuals
));
1632 Set_Etype
(N
, Standard_Void_Type
);
1635 elsif Is_Entity_Name
(P
)
1636 and then Is_Record_Type
(Etype
(Entity
(P
)))
1637 and then Remote_AST_I_Dereference
(P
)
1641 elsif Is_Entity_Name
(P
)
1642 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1644 if Is_Access_Type
(Etype
(P
))
1645 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1646 and then No
(Actuals
)
1647 and then Comes_From_Source
(N
)
1649 Error_Msg_N
("missing explicit dereference in call", N
);
1652 Analyze_Call_And_Resolve
;
1654 -- If the prefix is the simple name of an entry family, this is
1655 -- a parameterless call from within the task body itself.
1657 elsif Is_Entity_Name
(P
)
1658 and then Nkind
(P
) = N_Identifier
1659 and then Ekind
(Entity
(P
)) = E_Entry_Family
1660 and then Present
(Actuals
)
1661 and then No
(Next
(First
(Actuals
)))
1663 -- Can be call to parameterless entry family. What appears to be the
1664 -- sole argument is in fact the entry index. Rewrite prefix of node
1665 -- accordingly. Source representation is unchanged by this
1669 Make_Indexed_Component
(Loc
,
1671 Make_Selected_Component
(Loc
,
1672 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1673 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1674 Expressions
=> Actuals
);
1675 Set_Name
(N
, New_N
);
1676 Set_Etype
(New_N
, Standard_Void_Type
);
1677 Set_Parameter_Associations
(N
, No_List
);
1678 Analyze_Call_And_Resolve
;
1680 elsif Nkind
(P
) = N_Explicit_Dereference
then
1681 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1682 Analyze_Call_And_Resolve
;
1684 Error_Msg_N
("expect access to procedure in call", P
);
1687 -- The name can be a selected component or an indexed component that
1688 -- yields an access to subprogram. Such a prefix is legal if the call
1689 -- has parameter associations.
1691 elsif Is_Access_Type
(Etype
(P
))
1692 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1694 if Present
(Actuals
) then
1695 Analyze_Call_And_Resolve
;
1697 Error_Msg_N
("missing explicit dereference in call ", N
);
1700 -- If not an access to subprogram, then the prefix must resolve to the
1701 -- name of an entry, entry family, or protected operation.
1703 -- For the case of a simple entry call, P is a selected component where
1704 -- the prefix is the task and the selector name is the entry. A call to
1705 -- a protected procedure will have the same syntax. If the protected
1706 -- object contains overloaded operations, the entity may appear as a
1707 -- function, the context will select the operation whose type is Void.
1709 elsif Nkind
(P
) = N_Selected_Component
1710 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1714 Analyze_Call_And_Resolve
;
1716 elsif Nkind
(P
) = N_Selected_Component
1717 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1718 and then Present
(Actuals
)
1719 and then No
(Next
(First
(Actuals
)))
1721 -- Can be call to parameterless entry family. What appears to be the
1722 -- sole argument is in fact the entry index. Rewrite prefix of node
1723 -- accordingly. Source representation is unchanged by this
1727 Make_Indexed_Component
(Loc
,
1728 Prefix
=> New_Copy
(P
),
1729 Expressions
=> Actuals
);
1730 Set_Name
(N
, New_N
);
1731 Set_Etype
(New_N
, Standard_Void_Type
);
1732 Set_Parameter_Associations
(N
, No_List
);
1733 Analyze_Call_And_Resolve
;
1735 -- For the case of a reference to an element of an entry family, P is
1736 -- an indexed component whose prefix is a selected component (task and
1737 -- entry family), and whose index is the entry family index.
1739 elsif Nkind
(P
) = N_Indexed_Component
1740 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1741 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1743 Analyze_Call_And_Resolve
;
1745 -- If the prefix is the name of an entry family, it is a call from
1746 -- within the task body itself.
1748 elsif Nkind
(P
) = N_Indexed_Component
1749 and then Nkind
(Prefix
(P
)) = N_Identifier
1750 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1753 Make_Selected_Component
(Loc
,
1754 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1755 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1756 Rewrite
(Prefix
(P
), New_N
);
1758 Analyze_Call_And_Resolve
;
1760 -- In Ada 2012. a qualified expression is a name, but it cannot be a
1761 -- procedure name, so the construct can only be a qualified expression.
1763 elsif Nkind
(P
) = N_Qualified_Expression
1764 and then Ada_Version
>= Ada_2012
1766 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
1769 -- Anything else is an error
1772 Error_Msg_N
("invalid procedure or entry call", N
);
1774 end Analyze_Procedure_Call
;
1776 ------------------------------
1777 -- Analyze_Return_Statement --
1778 ------------------------------
1780 procedure Analyze_Return_Statement
(N
: Node_Id
) is
1782 pragma Assert
(Nkind_In
(N
, N_Simple_Return_Statement
,
1783 N_Extended_Return_Statement
));
1785 Returns_Object
: constant Boolean :=
1786 Nkind
(N
) = N_Extended_Return_Statement
1788 (Nkind
(N
) = N_Simple_Return_Statement
1789 and then Present
(Expression
(N
)));
1790 -- True if we're returning something; that is, "return <expression>;"
1791 -- or "return Result : T [:= ...]". False for "return;". Used for error
1792 -- checking: If Returns_Object is True, N should apply to a function
1793 -- body; otherwise N should apply to a procedure body, entry body,
1794 -- accept statement, or extended return statement.
1796 function Find_What_It_Applies_To
return Entity_Id
;
1797 -- Find the entity representing the innermost enclosing body, accept
1798 -- statement, or extended return statement. If the result is a callable
1799 -- construct or extended return statement, then this will be the value
1800 -- of the Return_Applies_To attribute. Otherwise, the program is
1801 -- illegal. See RM-6.5(4/2).
1803 -----------------------------
1804 -- Find_What_It_Applies_To --
1805 -----------------------------
1807 function Find_What_It_Applies_To
return Entity_Id
is
1808 Result
: Entity_Id
:= Empty
;
1811 -- Loop outward through the Scope_Stack, skipping blocks, loops,
1812 -- and postconditions.
1814 for J
in reverse 0 .. Scope_Stack
.Last
loop
1815 Result
:= Scope_Stack
.Table
(J
).Entity
;
1816 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
1817 and then Chars
(Result
) /= Name_uPostconditions
;
1820 pragma Assert
(Present
(Result
));
1822 end Find_What_It_Applies_To
;
1824 -- Local declarations
1826 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
1827 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
1828 Loc
: constant Source_Ptr
:= Sloc
(N
);
1829 Stm_Entity
: constant Entity_Id
:=
1831 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
1833 -- Start of processing for Analyze_Return_Statement
1836 Set_Return_Statement_Entity
(N
, Stm_Entity
);
1838 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
1839 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
1841 -- Place Return entity on scope stack, to simplify enforcement of 6.5
1842 -- (4/2): an inner return statement will apply to this extended return.
1844 if Nkind
(N
) = N_Extended_Return_Statement
then
1845 Push_Scope
(Stm_Entity
);
1848 -- Check that pragma No_Return is obeyed. Don't complain about the
1849 -- implicitly-generated return that is placed at the end.
1851 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
1852 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
1855 -- Warn on any unassigned OUT parameters if in procedure
1857 if Ekind
(Scope_Id
) = E_Procedure
then
1858 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
1861 -- Check that functions return objects, and other things do not
1863 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
1864 if not Returns_Object
then
1865 Error_Msg_N
("missing expression in return from function", N
);
1868 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
1869 if Returns_Object
then
1870 Error_Msg_N
("procedure cannot return value (use function)", N
);
1873 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
1874 if Returns_Object
then
1875 if Is_Protected_Type
(Scope
(Scope_Id
)) then
1876 Error_Msg_N
("entry body cannot return value", N
);
1878 Error_Msg_N
("accept statement cannot return value", N
);
1882 elsif Kind
= E_Return_Statement
then
1884 -- We are nested within another return statement, which must be an
1885 -- extended_return_statement.
1887 if Returns_Object
then
1888 if Nkind
(N
) = N_Extended_Return_Statement
then
1890 ("extended return statement cannot be nested (use `RETURN;`)",
1893 -- Case of a simple return statement with a value inside extended
1894 -- return statement.
1898 ("return nested in extended return statement cannot return "
1899 & "value (use `RETURN;`)", N
);
1904 Error_Msg_N
("illegal context for return statement", N
);
1907 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
1908 Analyze_Function_Return
(N
);
1910 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
1911 Set_Return_Present
(Scope_Id
);
1914 if Nkind
(N
) = N_Extended_Return_Statement
then
1918 Kill_Current_Values
(Last_Assignment_Only
=> True);
1919 Check_Unreachable_Code
(N
);
1921 Analyze_Dimension
(N
);
1922 end Analyze_Return_Statement
;
1924 -------------------------------------
1925 -- Analyze_Simple_Return_Statement --
1926 -------------------------------------
1928 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1930 if Present
(Expression
(N
)) then
1931 Mark_Coextensions
(N
, Expression
(N
));
1934 Analyze_Return_Statement
(N
);
1935 end Analyze_Simple_Return_Statement
;
1937 -------------------------
1938 -- Analyze_Return_Type --
1939 -------------------------
1941 procedure Analyze_Return_Type
(N
: Node_Id
) is
1942 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1943 Typ
: Entity_Id
:= Empty
;
1946 -- Normal case where result definition does not indicate an error
1948 if Result_Definition
(N
) /= Error
then
1949 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1950 Check_SPARK_05_Restriction
1951 ("access result is not allowed", Result_Definition
(N
));
1953 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1956 AD
: constant Node_Id
:=
1957 Access_To_Subprogram_Definition
(Result_Definition
(N
));
1959 if Present
(AD
) and then Protected_Present
(AD
) then
1960 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
1962 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1966 Set_Parent
(Typ
, Result_Definition
(N
));
1967 Set_Is_Local_Anonymous_Access
(Typ
);
1968 Set_Etype
(Designator
, Typ
);
1970 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1972 Null_Exclusion_Static_Checks
(N
);
1974 -- Subtype_Mark case
1977 Find_Type
(Result_Definition
(N
));
1978 Typ
:= Entity
(Result_Definition
(N
));
1979 Set_Etype
(Designator
, Typ
);
1981 -- Unconstrained array as result is not allowed in SPARK
1983 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
1984 Check_SPARK_05_Restriction
1985 ("returning an unconstrained array is not allowed",
1986 Result_Definition
(N
));
1989 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1991 Null_Exclusion_Static_Checks
(N
);
1993 -- If a null exclusion is imposed on the result type, then create
1994 -- a null-excluding itype (an access subtype) and use it as the
1995 -- function's Etype. Note that the null exclusion checks are done
1996 -- right before this, because they don't get applied to types that
1997 -- do not come from source.
1999 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2000 Set_Etype
(Designator
,
2001 Create_Null_Excluding_Itype
2004 Scope_Id
=> Scope
(Current_Scope
)));
2006 -- The new subtype must be elaborated before use because
2007 -- it is visible outside of the function. However its base
2008 -- type may not be frozen yet, so the reference that will
2009 -- force elaboration must be attached to the freezing of
2012 -- If the return specification appears on a proper body,
2013 -- the subtype will have been created already on the spec.
2015 if Is_Frozen
(Typ
) then
2016 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2017 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2021 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2025 Ensure_Freeze_Node
(Typ
);
2028 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2030 Set_Itype
(IR
, Etype
(Designator
));
2031 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2036 Set_Etype
(Designator
, Typ
);
2039 if Ekind
(Typ
) = E_Incomplete_Type
2040 and then Is_Value_Type
(Typ
)
2044 elsif Ekind
(Typ
) = E_Incomplete_Type
2045 or else (Is_Class_Wide_Type
(Typ
)
2046 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2048 -- AI05-0151: Tagged incomplete types are allowed in all formal
2049 -- parts. Untagged incomplete types are not allowed in bodies.
2050 -- As a consequence, limited views cannot appear in a basic
2051 -- declaration that is itself within a body, because there is
2052 -- no point at which the non-limited view will become visible.
2054 if Ada_Version
>= Ada_2012
then
2055 if From_Limited_With
(Typ
) and then In_Package_Body
then
2057 ("invalid use of incomplete type&",
2058 Result_Definition
(N
), Typ
);
2060 -- The return type of a subprogram body cannot be of a
2061 -- formal incomplete type.
2063 elsif Is_Generic_Type
(Typ
)
2064 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2067 ("return type cannot be a formal incomplete type",
2068 Result_Definition
(N
));
2070 elsif Is_Class_Wide_Type
(Typ
)
2071 and then Is_Generic_Type
(Root_Type
(Typ
))
2072 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2075 ("return type cannot be a formal incomplete type",
2076 Result_Definition
(N
));
2078 elsif Is_Tagged_Type
(Typ
) then
2081 -- Use is legal in a thunk generated for an operation
2082 -- inherited from a progenitor.
2084 elsif Is_Thunk
(Designator
)
2085 and then Present
(Non_Limited_View
(Typ
))
2089 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2090 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2094 ("invalid use of untagged incomplete type&",
2098 -- The type must be completed in the current package. This
2099 -- is checked at the end of the package declaration when
2100 -- Taft-amendment types are identified. If the return type
2101 -- is class-wide, there is no required check, the type can
2102 -- be a bona fide TAT.
2104 if Ekind
(Scope
(Current_Scope
)) = E_Package
2105 and then In_Private_Part
(Scope
(Current_Scope
))
2106 and then not Is_Class_Wide_Type
(Typ
)
2108 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2113 ("invalid use of incomplete type&", Designator
, Typ
);
2118 -- Case where result definition does indicate an error
2121 Set_Etype
(Designator
, Any_Type
);
2123 end Analyze_Return_Type
;
2125 -----------------------------
2126 -- Analyze_Subprogram_Body --
2127 -----------------------------
2129 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2130 Loc
: constant Source_Ptr
:= Sloc
(N
);
2131 Body_Spec
: constant Node_Id
:= Specification
(N
);
2132 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2135 if Debug_Flag_C
then
2136 Write_Str
("==> subprogram body ");
2137 Write_Name
(Chars
(Body_Id
));
2138 Write_Str
(" from ");
2139 Write_Location
(Loc
);
2144 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2146 -- The real work is split out into the helper, so it can do "return;"
2147 -- without skipping the debug output:
2149 Analyze_Subprogram_Body_Helper
(N
);
2151 if Debug_Flag_C
then
2153 Write_Str
("<== subprogram body ");
2154 Write_Name
(Chars
(Body_Id
));
2155 Write_Str
(" from ");
2156 Write_Location
(Loc
);
2159 end Analyze_Subprogram_Body
;
2161 --------------------------------------
2162 -- Analyze_Subprogram_Body_Contract --
2163 --------------------------------------
2165 procedure Analyze_Subprogram_Body_Contract
(Body_Id
: Entity_Id
) is
2166 Items
: constant Node_Id
:= Contract
(Body_Id
);
2167 Mode
: SPARK_Mode_Type
;
2170 Ref_Depends
: Node_Id
:= Empty
;
2171 Ref_Global
: Node_Id
:= Empty
;
2174 -- When a subprogram body declaration is illegal, its defining entity is
2175 -- left unanalyzed. There is nothing left to do in this case because the
2176 -- body lacks a contract, or even a proper Ekind.
2178 if Ekind
(Body_Id
) = E_Void
then
2182 -- Due to the timing of contract analysis, delayed pragmas may be
2183 -- subject to the wrong SPARK_Mode, usually that of the enclosing
2184 -- context. To remedy this, restore the original SPARK_Mode of the
2185 -- related subprogram body.
2187 Save_SPARK_Mode_And_Set
(Body_Id
, Mode
);
2189 -- All subprograms carry a contract, but for some it is not significant
2190 -- and should not be processed.
2192 if not Has_Significant_Contract
(Body_Id
) then
2195 -- The subprogram body is a completion, analyze all delayed pragmas that
2196 -- apply. Note that when the body is stand alone, the pragmas are always
2197 -- analyzed on the spot.
2199 elsif Present
(Items
) then
2201 -- Locate and store pragmas Refined_Depends and Refined_Global since
2202 -- their order of analysis matters.
2204 Prag
:= Classifications
(Items
);
2205 while Present
(Prag
) loop
2206 Prag_Nam
:= Pragma_Name
(Prag
);
2208 if Prag_Nam
= Name_Refined_Depends
then
2209 Ref_Depends
:= Prag
;
2211 elsif Prag_Nam
= Name_Refined_Global
then
2215 Prag
:= Next_Pragma
(Prag
);
2218 -- Analyze Refined_Global first as Refined_Depends may mention items
2219 -- classified in the global refinement.
2221 if Present
(Ref_Global
) then
2222 Analyze_Refined_Global_In_Decl_Part
(Ref_Global
);
2225 -- Refined_Depends must be analyzed after Refined_Global in order to
2226 -- see the modes of all global refinements.
2228 if Present
(Ref_Depends
) then
2229 Analyze_Refined_Depends_In_Decl_Part
(Ref_Depends
);
2233 -- Ensure that the contract cases or postconditions mention 'Result or
2234 -- define a post-state.
2236 Check_Result_And_Post_State
(Body_Id
);
2238 -- Restore the SPARK_Mode of the enclosing context after all delayed
2239 -- pragmas have been analyzed.
2241 Restore_SPARK_Mode
(Mode
);
2242 end Analyze_Subprogram_Body_Contract
;
2244 ------------------------------------
2245 -- Analyze_Subprogram_Body_Helper --
2246 ------------------------------------
2248 -- This procedure is called for regular subprogram bodies, generic bodies,
2249 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2250 -- specification matters, and is used to create a proper declaration for
2251 -- the subprogram, or to perform conformance checks.
2253 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2254 Loc
: constant Source_Ptr
:= Sloc
(N
);
2255 Body_Spec
: Node_Id
:= Specification
(N
);
2256 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2257 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2258 Conformant
: Boolean;
2260 Prot_Typ
: Entity_Id
:= Empty
;
2261 Spec_Id
: Entity_Id
;
2262 Spec_Decl
: Node_Id
:= Empty
;
2264 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2265 -- When we analyze a separate spec, the entity chain ends up containing
2266 -- the formals, as well as any itypes generated during analysis of the
2267 -- default expressions for parameters, or the arguments of associated
2268 -- precondition/postcondition pragmas (which are analyzed in the context
2269 -- of the spec since they have visibility on formals).
2271 -- These entities belong with the spec and not the body. However we do
2272 -- the analysis of the body in the context of the spec (again to obtain
2273 -- visibility to the formals), and all the entities generated during
2274 -- this analysis end up also chained to the entity chain of the spec.
2275 -- But they really belong to the body, and there is circuitry to move
2276 -- them from the spec to the body.
2278 -- However, when we do this move, we don't want to move the real spec
2279 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2280 -- variable points to the last real spec entity, so we only move those
2281 -- chained beyond that point. It is initialized to Empty to deal with
2282 -- the case where there is no separate spec.
2284 function Body_Has_Contract
return Boolean;
2285 -- Check whether unanalyzed body has an aspect or pragma that may
2286 -- generate a SPARK contract.
2288 procedure Build_Subprogram_Declaration
;
2289 -- Create a matching subprogram declaration for subprogram body N
2291 procedure Check_Anonymous_Return
;
2292 -- Ada 2005: if a function returns an access type that denotes a task,
2293 -- or a type that contains tasks, we must create a master entity for
2294 -- the anonymous type, which typically will be used in an allocator
2295 -- in the body of the function.
2297 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2298 -- Look ahead to recognize a pragma that may appear after the body.
2299 -- If there is a previous spec, check that it appears in the same
2300 -- declarative part. If the pragma is Inline_Always, perform inlining
2301 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2302 -- If the body acts as a spec, and inlining is required, we create a
2303 -- subprogram declaration for it, in order to attach the body to inline.
2304 -- If pragma does not appear after the body, check whether there is
2305 -- an inline pragma before any local declarations.
2307 procedure Check_Missing_Return
;
2308 -- Checks for a function with a no return statements, and also performs
2309 -- the warning checks implemented by Check_Returns. In formal mode, also
2310 -- verify that a function ends with a RETURN and that a procedure does
2311 -- not contain any RETURN.
2313 function Disambiguate_Spec
return Entity_Id
;
2314 -- When a primitive is declared between the private view and the full
2315 -- view of a concurrent type which implements an interface, a special
2316 -- mechanism is used to find the corresponding spec of the primitive
2319 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
);
2320 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2321 -- incomplete types coming from a limited context and swap their limited
2322 -- views with the non-limited ones.
2324 function Is_Private_Concurrent_Primitive
2325 (Subp_Id
: Entity_Id
) return Boolean;
2326 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2327 -- type that implements an interface and has a private view.
2329 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2330 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2331 -- subprogram whose body is being analyzed. N is the statement node
2332 -- causing the flag to be set, if the following statement is a return
2333 -- of an entity, we mark the entity as set in source to suppress any
2334 -- warning on the stylized use of function stubs with a dummy return.
2336 procedure Verify_Overriding_Indicator
;
2337 -- If there was a previous spec, the entity has been entered in the
2338 -- current scope previously. If the body itself carries an overriding
2339 -- indicator, check that it is consistent with the known status of the
2342 -----------------------
2343 -- Body_Has_Contract --
2344 -----------------------
2346 function Body_Has_Contract
return Boolean is
2347 Decls
: constant List_Id
:= Declarations
(N
);
2351 -- Check for unanalyzed aspects in the body that will generate a
2354 if Present
(Aspect_Specifications
(N
)) then
2355 Item
:= First
(Aspect_Specifications
(N
));
2356 while Present
(Item
) loop
2357 if Is_Contract_Annotation
(Item
) then
2365 -- Check for pragmas that may generate a contract
2367 if Present
(Decls
) then
2368 Item
:= First
(Decls
);
2369 while Present
(Item
) loop
2370 if Nkind
(Item
) = N_Pragma
2371 and then Is_Contract_Annotation
(Item
)
2381 end Body_Has_Contract
;
2383 ----------------------------------
2384 -- Build_Subprogram_Declaration --
2385 ----------------------------------
2387 procedure Build_Subprogram_Declaration
is
2390 Subp_Decl
: Node_Id
;
2393 -- Create a matching subprogram spec using the profile of the body.
2394 -- The structure of the tree is identical, but has new entities for
2395 -- the defining unit name and formal parameters.
2398 Make_Subprogram_Declaration
(Loc
,
2399 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2401 -- Relocate the aspects of the subprogram body to the new subprogram
2402 -- spec because it acts as the initial declaration.
2403 -- ??? what about pragmas
2405 Move_Aspects
(N
, To
=> Subp_Decl
);
2406 Insert_Before_And_Analyze
(N
, Subp_Decl
);
2408 -- The analysis of the subprogram spec aspects may introduce pragmas
2409 -- that need to be analyzed.
2411 Decl
:= Next
(Subp_Decl
);
2412 while Present
(Decl
) loop
2414 -- Stop the search for pragmas once the body has been reached as
2415 -- this terminates the region where pragmas may appear.
2420 elsif Nkind
(Decl
) = N_Pragma
then
2427 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2428 Set_Corresponding_Spec
(N
, Spec_Id
);
2430 -- Mark the generated spec as a source construct to ensure that all
2431 -- calls to it are properly registered in ALI files for GNATprove.
2433 Set_Comes_From_Source
(Spec_Id
, True);
2435 -- If aspect SPARK_Mode was specified on the body, it needs to be
2436 -- repeated both on the generated spec and the body.
2438 Asp
:= Find_Aspect
(Spec_Id
, Aspect_SPARK_Mode
);
2440 if Present
(Asp
) then
2441 Asp
:= New_Copy_Tree
(Asp
);
2442 Set_Analyzed
(Asp
, False);
2443 Set_Aspect_Specifications
(N
, New_List
(Asp
));
2446 -- Ensure that the specs of the subprogram declaration and its body
2447 -- are identical, otherwise they will appear non-conformant due to
2448 -- rewritings in the default values of formal parameters.
2450 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2451 Set_Specification
(N
, Body_Spec
);
2452 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2453 end Build_Subprogram_Declaration
;
2455 ----------------------------
2456 -- Check_Anonymous_Return --
2457 ----------------------------
2459 procedure Check_Anonymous_Return
is
2465 if Present
(Spec_Id
) then
2471 if Ekind
(Scop
) = E_Function
2472 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2473 and then not Is_Thunk
(Scop
)
2475 -- Skip internally built functions which handle the case of
2476 -- a null access (see Expand_Interface_Conversion)
2478 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2479 and then not Comes_From_Source
(Parent
(Scop
)))
2481 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2483 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2485 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2486 and then Expander_Active
2488 -- Avoid cases with no tasking support
2490 and then RTE_Available
(RE_Current_Master
)
2491 and then not Restriction_Active
(No_Task_Hierarchy
)
2494 Make_Object_Declaration
(Loc
,
2495 Defining_Identifier
=>
2496 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2497 Constant_Present
=> True,
2498 Object_Definition
=>
2499 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2501 Make_Explicit_Dereference
(Loc
,
2502 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2504 if Present
(Declarations
(N
)) then
2505 Prepend
(Decl
, Declarations
(N
));
2507 Set_Declarations
(N
, New_List
(Decl
));
2510 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2511 Set_Has_Master_Entity
(Scop
);
2513 -- Now mark the containing scope as a task master
2516 while Nkind
(Par
) /= N_Compilation_Unit
loop
2517 Par
:= Parent
(Par
);
2518 pragma Assert
(Present
(Par
));
2520 -- If we fall off the top, we are at the outer level, and
2521 -- the environment task is our effective master, so nothing
2525 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2527 Set_Is_Task_Master
(Par
, True);
2532 end Check_Anonymous_Return
;
2534 -------------------------
2535 -- Check_Inline_Pragma --
2536 -------------------------
2538 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2542 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2543 -- True when N is a pragma Inline or Inline_Always that applies
2544 -- to this subprogram.
2546 -----------------------
2547 -- Is_Inline_Pragma --
2548 -----------------------
2550 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2553 Nkind
(N
) = N_Pragma
2555 (Pragma_Name
(N
) = Name_Inline_Always
2556 or else (Front_End_Inlining
2557 and then Pragma_Name
(N
) = Name_Inline
))
2560 (Expression
(First
(Pragma_Argument_Associations
(N
)))) =
2562 end Is_Inline_Pragma
;
2564 -- Start of processing for Check_Inline_Pragma
2567 if not Expander_Active
then
2571 if Is_List_Member
(N
)
2572 and then Present
(Next
(N
))
2573 and then Is_Inline_Pragma
(Next
(N
))
2577 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2578 and then Present
(Declarations
(N
))
2579 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2581 Prag
:= First
(Declarations
(N
));
2587 if Present
(Prag
) then
2588 if Present
(Spec_Id
) then
2589 if In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
)) then
2594 -- Create a subprogram declaration, to make treatment uniform
2597 Subp
: constant Entity_Id
:=
2598 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
2599 Decl
: constant Node_Id
:=
2600 Make_Subprogram_Declaration
(Loc
,
2602 New_Copy_Tree
(Specification
(N
)));
2605 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2607 if Present
(First_Formal
(Body_Id
)) then
2608 Plist
:= Copy_Parameter_List
(Body_Id
);
2609 Set_Parameter_Specifications
2610 (Specification
(Decl
), Plist
);
2613 Insert_Before
(N
, Decl
);
2616 Set_Has_Pragma_Inline
(Subp
);
2618 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2619 Set_Is_Inlined
(Subp
);
2620 Set_Has_Pragma_Inline_Always
(Subp
);
2623 -- Prior to copying the subprogram body to create a template
2624 -- for it for subsequent inlining, remove the pragma from
2625 -- the current body so that the copy that will produce the
2626 -- new body will start from a completely unanalyzed tree.
2628 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2629 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2636 end Check_Inline_Pragma
;
2638 --------------------------
2639 -- Check_Missing_Return --
2640 --------------------------
2642 procedure Check_Missing_Return
is
2644 Missing_Ret
: Boolean;
2647 if Nkind
(Body_Spec
) = N_Function_Specification
then
2648 if Present
(Spec_Id
) then
2654 if Return_Present
(Id
) then
2655 Check_Returns
(HSS
, 'F', Missing_Ret
);
2658 Set_Has_Missing_Return
(Id
);
2661 elsif Is_Generic_Subprogram
(Id
)
2662 or else not Is_Machine_Code_Subprogram
(Id
)
2664 Error_Msg_N
("missing RETURN statement in function body", N
);
2667 -- If procedure with No_Return, check returns
2669 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2670 and then Present
(Spec_Id
)
2671 and then No_Return
(Spec_Id
)
2673 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2676 -- Special checks in SPARK mode
2678 if Nkind
(Body_Spec
) = N_Function_Specification
then
2680 -- In SPARK mode, last statement of a function should be a return
2683 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
2686 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
2687 N_Extended_Return_Statement
)
2689 Check_SPARK_05_Restriction
2690 ("last statement in function should be RETURN", Stat
);
2694 -- In SPARK mode, verify that a procedure has no return
2696 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
2697 if Present
(Spec_Id
) then
2703 -- Would be nice to point to return statement here, can we
2704 -- borrow the Check_Returns procedure here ???
2706 if Return_Present
(Id
) then
2707 Check_SPARK_05_Restriction
2708 ("procedure should not have RETURN", N
);
2711 end Check_Missing_Return
;
2713 -----------------------
2714 -- Disambiguate_Spec --
2715 -----------------------
2717 function Disambiguate_Spec
return Entity_Id
is
2718 Priv_Spec
: Entity_Id
;
2721 procedure Replace_Types
(To_Corresponding
: Boolean);
2722 -- Depending on the flag, replace the type of formal parameters of
2723 -- Body_Id if it is a concurrent type implementing interfaces with
2724 -- the corresponding record type or the other way around.
2726 procedure Replace_Types
(To_Corresponding
: Boolean) is
2728 Formal_Typ
: Entity_Id
;
2731 Formal
:= First_Formal
(Body_Id
);
2732 while Present
(Formal
) loop
2733 Formal_Typ
:= Etype
(Formal
);
2735 if Is_Class_Wide_Type
(Formal_Typ
) then
2736 Formal_Typ
:= Root_Type
(Formal_Typ
);
2739 -- From concurrent type to corresponding record
2741 if To_Corresponding
then
2742 if Is_Concurrent_Type
(Formal_Typ
)
2743 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2746 (Corresponding_Record_Type
(Formal_Typ
)))
2749 Corresponding_Record_Type
(Formal_Typ
));
2752 -- From corresponding record to concurrent type
2755 if Is_Concurrent_Record_Type
(Formal_Typ
)
2756 and then Present
(Interfaces
(Formal_Typ
))
2759 Corresponding_Concurrent_Type
(Formal_Typ
));
2763 Next_Formal
(Formal
);
2767 -- Start of processing for Disambiguate_Spec
2770 -- Try to retrieve the specification of the body as is. All error
2771 -- messages are suppressed because the body may not have a spec in
2772 -- its current state.
2774 Spec_N
:= Find_Corresponding_Spec
(N
, False);
2776 -- It is possible that this is the body of a primitive declared
2777 -- between a private and a full view of a concurrent type. The
2778 -- controlling parameter of the spec carries the concurrent type,
2779 -- not the corresponding record type as transformed by Analyze_
2780 -- Subprogram_Specification. In such cases, we undo the change
2781 -- made by the analysis of the specification and try to find the
2784 -- Note that wrappers already have their corresponding specs and
2785 -- bodies set during their creation, so if the candidate spec is
2786 -- a wrapper, then we definitely need to swap all types to their
2787 -- original concurrent status.
2790 or else Is_Primitive_Wrapper
(Spec_N
)
2792 -- Restore all references of corresponding record types to the
2793 -- original concurrent types.
2795 Replace_Types
(To_Corresponding
=> False);
2796 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
2798 -- The current body truly belongs to a primitive declared between
2799 -- a private and a full view. We leave the modified body as is,
2800 -- and return the true spec.
2802 if Present
(Priv_Spec
)
2803 and then Is_Private_Primitive
(Priv_Spec
)
2808 -- In case that this is some sort of error, restore the original
2809 -- state of the body.
2811 Replace_Types
(To_Corresponding
=> True);
2815 end Disambiguate_Spec
;
2817 ----------------------------
2818 -- Exchange_Limited_Views --
2819 ----------------------------
2821 procedure Exchange_Limited_Views
(Subp_Id
: Entity_Id
) is
2822 procedure Detect_And_Exchange
(Id
: Entity_Id
);
2823 -- Determine whether Id's type denotes an incomplete type associated
2824 -- with a limited with clause and exchange the limited view with the
2827 -------------------------
2828 -- Detect_And_Exchange --
2829 -------------------------
2831 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
2832 Typ
: constant Entity_Id
:= Etype
(Id
);
2834 if From_Limited_With
(Typ
) and then Has_Non_Limited_View
(Typ
) then
2835 Set_Etype
(Id
, Non_Limited_View
(Typ
));
2837 end Detect_And_Exchange
;
2843 -- Start of processing for Exchange_Limited_Views
2846 if No
(Subp_Id
) then
2849 -- Do not process subprogram bodies as they already use the non-
2850 -- limited view of types.
2852 elsif not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
2856 -- Examine all formals and swap views when applicable
2858 Formal
:= First_Formal
(Subp_Id
);
2859 while Present
(Formal
) loop
2860 Detect_And_Exchange
(Formal
);
2862 Next_Formal
(Formal
);
2865 -- Process the return type of a function
2867 if Ekind
(Subp_Id
) = E_Function
then
2868 Detect_And_Exchange
(Subp_Id
);
2870 end Exchange_Limited_Views
;
2872 -------------------------------------
2873 -- Is_Private_Concurrent_Primitive --
2874 -------------------------------------
2876 function Is_Private_Concurrent_Primitive
2877 (Subp_Id
: Entity_Id
) return Boolean
2879 Formal_Typ
: Entity_Id
;
2882 if Present
(First_Formal
(Subp_Id
)) then
2883 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
2885 if Is_Concurrent_Record_Type
(Formal_Typ
) then
2886 if Is_Class_Wide_Type
(Formal_Typ
) then
2887 Formal_Typ
:= Root_Type
(Formal_Typ
);
2890 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
2893 -- The type of the first formal is a concurrent tagged type with
2897 Is_Concurrent_Type
(Formal_Typ
)
2898 and then Is_Tagged_Type
(Formal_Typ
)
2899 and then Has_Private_Declaration
(Formal_Typ
);
2903 end Is_Private_Concurrent_Primitive
;
2905 ----------------------------
2906 -- Set_Trivial_Subprogram --
2907 ----------------------------
2909 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
2910 Nxt
: constant Node_Id
:= Next
(N
);
2913 Set_Is_Trivial_Subprogram
(Body_Id
);
2915 if Present
(Spec_Id
) then
2916 Set_Is_Trivial_Subprogram
(Spec_Id
);
2920 and then Nkind
(Nxt
) = N_Simple_Return_Statement
2921 and then No
(Next
(Nxt
))
2922 and then Present
(Expression
(Nxt
))
2923 and then Is_Entity_Name
(Expression
(Nxt
))
2925 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
2927 end Set_Trivial_Subprogram
;
2929 ---------------------------------
2930 -- Verify_Overriding_Indicator --
2931 ---------------------------------
2933 procedure Verify_Overriding_Indicator
is
2935 if Must_Override
(Body_Spec
) then
2936 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
2937 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
2941 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
2943 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
2945 -- Overriding indicators aren't allowed for protected subprogram
2946 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
2947 -- this to a warning if -gnatd.E is enabled.
2949 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
2950 Error_Msg_Warn
:= Error_To_Warning
;
2952 ("<<overriding indicator not allowed for protected "
2953 & "subprogram body", Body_Spec
);
2956 elsif Must_Not_Override
(Body_Spec
) then
2957 if Present
(Overridden_Operation
(Spec_Id
)) then
2959 ("subprogram& overrides inherited operation",
2960 Body_Spec
, Spec_Id
);
2962 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
2963 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
2966 ("subprogram& overrides predefined operator ",
2967 Body_Spec
, Spec_Id
);
2969 -- Overriding indicators aren't allowed for protected subprogram
2970 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
2971 -- this to a warning if -gnatd.E is enabled.
2973 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
2974 Error_Msg_Warn
:= Error_To_Warning
;
2977 ("<<overriding indicator not allowed "
2978 & "for protected subprogram body", Body_Spec
);
2980 -- If this is not a primitive operation, then the overriding
2981 -- indicator is altogether illegal.
2983 elsif not Is_Primitive
(Spec_Id
) then
2985 ("overriding indicator only allowed "
2986 & "if subprogram is primitive", Body_Spec
);
2989 -- If checking the style rule and the operation overrides, then
2990 -- issue a warning about a missing overriding_indicator. Protected
2991 -- subprogram bodies are excluded from this style checking, since
2992 -- they aren't primitives (even though their declarations can
2993 -- override) and aren't allowed to have an overriding_indicator.
2996 and then Present
(Overridden_Operation
(Spec_Id
))
2997 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
2999 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3000 Style
.Missing_Overriding
(N
, Body_Id
);
3003 and then Can_Override_Operator
(Spec_Id
)
3004 and then not Is_Predefined_File_Name
3005 (Unit_File_Name
(Get_Source_Unit
(Spec_Id
)))
3007 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3008 Style
.Missing_Overriding
(N
, Body_Id
);
3010 end Verify_Overriding_Indicator
;
3012 -- Start of processing for Analyze_Subprogram_Body_Helper
3015 -- Generic subprograms are handled separately. They always have a
3016 -- generic specification. Determine whether current scope has a
3017 -- previous declaration.
3019 -- If the subprogram body is defined within an instance of the same
3020 -- name, the instance appears as a package renaming, and will be hidden
3021 -- within the subprogram.
3023 if Present
(Prev_Id
)
3024 and then not Is_Overloadable
(Prev_Id
)
3025 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3026 or else Comes_From_Source
(Prev_Id
))
3028 if Is_Generic_Subprogram
(Prev_Id
) then
3031 -- The corresponding spec may be subject to pragma Ghost with
3032 -- policy Ignore. Set the mode now to ensure that any nodes
3033 -- generated during analysis and expansion are properly flagged
3034 -- as ignored Ghost.
3036 Set_Ghost_Mode
(N
, Spec_Id
);
3037 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3038 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3040 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3042 if Nkind
(N
) = N_Subprogram_Body
then
3043 HSS
:= Handled_Statement_Sequence
(N
);
3044 Check_Missing_Return
;
3050 -- Previous entity conflicts with subprogram name. Attempting to
3051 -- enter name will post error.
3053 Enter_Name
(Body_Id
);
3057 -- Non-generic case, find the subprogram declaration, if one was seen,
3058 -- or enter new overloaded entity in the current scope. If the
3059 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3060 -- part of the context of one of its subunits. No need to redo the
3063 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3067 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3069 if Nkind
(N
) = N_Subprogram_Body_Stub
3070 or else No
(Corresponding_Spec
(N
))
3072 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3073 Spec_Id
:= Disambiguate_Spec
;
3075 -- The corresponding spec may be subject to pragma Ghost with
3076 -- policy Ignore. Set the mode now to ensure that any nodes
3077 -- generated during analysis and expansion are properly flagged
3078 -- as ignored Ghost.
3080 Set_Ghost_Mode
(N
, Spec_Id
);
3083 Spec_Id
:= Find_Corresponding_Spec
(N
);
3085 -- The corresponding spec may be subject to pragma Ghost with
3086 -- policy Ignore. Set the mode now to ensure that any nodes
3087 -- generated during analysis and expansion are properly flagged
3088 -- as ignored Ghost.
3090 Set_Ghost_Mode
(N
, Spec_Id
);
3092 -- In GNATprove mode, if the body has no previous spec, create
3093 -- one so that the inlining machinery can operate properly.
3094 -- Transfer aspects, if any, to the new spec, so that they
3095 -- are legal and can be processed ahead of the body.
3096 -- We make two copies of the given spec, one for the new
3097 -- declaration, and one for the body.
3099 if No
(Spec_Id
) and then GNATprove_Mode
3101 -- Inlining does not apply during pre-analysis of code
3103 and then Full_Analysis
3105 -- Inlining only applies to full bodies, not stubs
3107 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3109 -- Inlining only applies to bodies in the source code, not to
3110 -- those generated by the compiler. In particular, expression
3111 -- functions, whose body is generated by the compiler, are
3112 -- treated specially by GNATprove.
3114 and then Comes_From_Source
(Body_Id
)
3116 -- This cannot be done for a compilation unit, which is not
3117 -- in a context where we can insert a new spec.
3119 and then Is_List_Member
(N
)
3121 -- Inlining only applies to subprograms without contracts,
3122 -- as a contract is a sign that GNATprove should perform a
3123 -- modular analysis of the subprogram instead of a contextual
3124 -- analysis at each call site. The same test is performed in
3125 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3126 -- here in another form (because the contract has not
3127 -- been attached to the body) to avoid frontend errors in
3128 -- case pragmas are used instead of aspects, because the
3129 -- corresponding pragmas in the body would not be transferred
3130 -- to the spec, leading to legality errors.
3132 and then not Body_Has_Contract
3133 and then not Inside_A_Generic
3135 Build_Subprogram_Declaration
;
3139 -- If this is a duplicate body, no point in analyzing it
3141 if Error_Posted
(N
) then
3145 -- A subprogram body should cause freezing of its own declaration,
3146 -- but if there was no previous explicit declaration, then the
3147 -- subprogram will get frozen too late (there may be code within
3148 -- the body that depends on the subprogram having been frozen,
3149 -- such as uses of extra formals), so we force it to be frozen
3150 -- here. Same holds if the body and spec are compilation units.
3151 -- Finally, if the return type is an anonymous access to protected
3152 -- subprogram, it must be frozen before the body because its
3153 -- expansion has generated an equivalent type that is used when
3154 -- elaborating the body.
3156 -- An exception in the case of Ada 2012, AI05-177: The bodies
3157 -- created for expression functions do not freeze.
3160 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3162 Freeze_Before
(N
, Body_Id
);
3164 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3165 Freeze_Before
(N
, Spec_Id
);
3167 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3168 Freeze_Before
(N
, Etype
(Body_Id
));
3172 Spec_Id
:= Corresponding_Spec
(N
);
3174 -- The corresponding spec may be subject to pragma Ghost with
3175 -- policy Ignore. Set the mode now to ensure that any nodes
3176 -- generated during analysis and expansion are properly flagged
3177 -- as ignored Ghost.
3179 Set_Ghost_Mode
(N
, Spec_Id
);
3183 -- Previously we scanned the body to look for nested subprograms, and
3184 -- rejected an inline directive if nested subprograms were present,
3185 -- because the back-end would generate conflicting symbols for the
3186 -- nested bodies. This is now unnecessary.
3188 -- Look ahead to recognize a pragma Inline that appears after the body
3190 Check_Inline_Pragma
(Spec_Id
);
3192 -- Deal with special case of a fully private operation in the body of
3193 -- the protected type. We must create a declaration for the subprogram,
3194 -- in order to attach the protected subprogram that will be used in
3195 -- internal calls. We exclude compiler generated bodies from the
3196 -- expander since the issue does not arise for those cases.
3199 and then Comes_From_Source
(N
)
3200 and then Is_Protected_Type
(Current_Scope
)
3202 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3205 -- If a separate spec is present, then deal with freezing issues
3207 if Present
(Spec_Id
) then
3208 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3209 Verify_Overriding_Indicator
;
3211 -- In general, the spec will be frozen when we start analyzing the
3212 -- body. However, for internally generated operations, such as
3213 -- wrapper functions for inherited operations with controlling
3214 -- results, the spec may not have been frozen by the time we expand
3215 -- the freeze actions that include the bodies. In particular, extra
3216 -- formals for accessibility or for return-in-place may need to be
3217 -- generated. Freeze nodes, if any, are inserted before the current
3218 -- body. These freeze actions are also needed in ASIS mode to enable
3219 -- the proper back-annotations.
3221 if not Is_Frozen
(Spec_Id
)
3222 and then (Expander_Active
or ASIS_Mode
)
3224 -- Force the generation of its freezing node to ensure proper
3225 -- management of access types in the backend.
3227 -- This is definitely needed for some cases, but it is not clear
3228 -- why, to be investigated further???
3230 Set_Has_Delayed_Freeze
(Spec_Id
);
3231 Freeze_Before
(N
, Spec_Id
);
3235 -- Place subprogram on scope stack, and make formals visible. If there
3236 -- is a spec, the visible entity remains that of the spec.
3238 if Present
(Spec_Id
) then
3239 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3241 if Is_Child_Unit
(Spec_Id
) then
3242 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3246 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3249 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3250 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3252 if Is_Abstract_Subprogram
(Spec_Id
) then
3253 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3257 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3258 Set_Has_Completion
(Spec_Id
);
3260 -- Inherit the "ghostness" of the subprogram spec. Note that this
3261 -- property is not directly inherited as the body may be subject
3262 -- to a different Ghost assertion policy.
3264 if Is_Ghost_Entity
(Spec_Id
) or else Ghost_Mode
> None
then
3265 Set_Is_Ghost_Entity
(Body_Id
);
3267 -- The Ghost policy in effect at the point of declaration and
3268 -- at the point of completion must match (SPARK RM 6.9(15)).
3270 Check_Ghost_Completion
(Spec_Id
, Body_Id
);
3273 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3274 Prot_Typ
:= Scope
(Spec_Id
);
3277 -- If this is a body generated for a renaming, do not check for
3278 -- full conformance. The check is redundant, because the spec of
3279 -- the body is a copy of the spec in the renaming declaration,
3280 -- and the test can lead to spurious errors on nested defaults.
3282 if Present
(Spec_Decl
)
3283 and then not Comes_From_Source
(N
)
3285 (Nkind
(Original_Node
(Spec_Decl
)) =
3286 N_Subprogram_Renaming_Declaration
3287 or else (Present
(Corresponding_Body
(Spec_Decl
))
3289 Nkind
(Unit_Declaration_Node
3290 (Corresponding_Body
(Spec_Decl
))) =
3291 N_Subprogram_Renaming_Declaration
))
3295 -- Conversely, the spec may have been generated for specless body
3296 -- with an inline pragma.
3298 elsif Comes_From_Source
(N
)
3299 and then not Comes_From_Source
(Spec_Id
)
3300 and then Has_Pragma_Inline
(Spec_Id
)
3307 Fully_Conformant
, True, Conformant
, Body_Id
);
3310 -- If the body is not fully conformant, we have to decide if we
3311 -- should analyze it or not. If it has a really messed up profile
3312 -- then we probably should not analyze it, since we will get too
3313 -- many bogus messages.
3315 -- Our decision is to go ahead in the non-fully conformant case
3316 -- only if it is at least mode conformant with the spec. Note
3317 -- that the call to Check_Fully_Conformant has issued the proper
3318 -- error messages to complain about the lack of conformance.
3321 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3327 if Spec_Id
/= Body_Id
then
3328 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3331 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3333 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3334 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3339 Set_Corresponding_Spec
(N
, Spec_Id
);
3341 -- Ada 2005 (AI-345): If the operation is a primitive operation
3342 -- of a concurrent type, the type of the first parameter has been
3343 -- replaced with the corresponding record, which is the proper
3344 -- run-time structure to use. However, within the body there may
3345 -- be uses of the formals that depend on primitive operations
3346 -- of the type (in particular calls in prefixed form) for which
3347 -- we need the original concurrent type. The operation may have
3348 -- several controlling formals, so the replacement must be done
3351 if Comes_From_Source
(Spec_Id
)
3352 and then Present
(First_Entity
(Spec_Id
))
3353 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3354 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3355 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3356 and then Present
(Corresponding_Concurrent_Type
3357 (Etype
(First_Entity
(Spec_Id
))))
3360 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3364 Form
:= First_Formal
(Spec_Id
);
3365 while Present
(Form
) loop
3366 if Etype
(Form
) = Typ
then
3367 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3375 -- Make the formals visible, and place subprogram on scope stack.
3376 -- This is also the point at which we set Last_Real_Spec_Entity
3377 -- to mark the entities which will not be moved to the body.
3379 Install_Formals
(Spec_Id
);
3380 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3382 -- Within an instance, add local renaming declarations so that
3383 -- gdb can retrieve the values of actuals more easily. This is
3384 -- only relevant if generating code (and indeed we definitely
3385 -- do not want these definitions -gnatc mode, because that would
3388 if Is_Generic_Instance
(Spec_Id
)
3389 and then Is_Wrapper_Package
(Current_Scope
)
3390 and then Expander_Active
3392 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3395 Push_Scope
(Spec_Id
);
3397 -- Make sure that the subprogram is immediately visible. For
3398 -- child units that have no separate spec this is indispensable.
3399 -- Otherwise it is safe albeit redundant.
3401 Set_Is_Immediately_Visible
(Spec_Id
);
3404 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3405 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3406 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3408 -- Case of subprogram body with no previous spec
3411 -- Check for style warning required
3415 -- Only apply check for source level subprograms for which checks
3416 -- have not been suppressed.
3418 and then Comes_From_Source
(Body_Id
)
3419 and then not Suppress_Style_Checks
(Body_Id
)
3421 -- No warnings within an instance
3423 and then not In_Instance
3425 -- No warnings for expression functions
3427 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3429 Style
.Body_With_No_Spec
(N
);
3432 New_Overloaded_Entity
(Body_Id
);
3434 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3435 Set_Acts_As_Spec
(N
);
3436 Generate_Definition
(Body_Id
);
3438 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3439 Install_Formals
(Body_Id
);
3441 Push_Scope
(Body_Id
);
3444 -- For stubs and bodies with no previous spec, generate references to
3447 Generate_Reference_To_Formals
(Body_Id
);
3450 -- Set SPARK_Mode from context
3452 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
3453 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
3455 -- If the return type is an anonymous access type whose designated type
3456 -- is the limited view of a class-wide type and the non-limited view is
3457 -- available, update the return type accordingly.
3459 if Ada_Version
>= Ada_2005
and then Comes_From_Source
(N
) then
3465 Rtyp
:= Etype
(Current_Scope
);
3467 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
3468 Etyp
:= Directly_Designated_Type
(Rtyp
);
3470 if Is_Class_Wide_Type
(Etyp
)
3471 and then From_Limited_With
(Etyp
)
3473 Set_Directly_Designated_Type
3474 (Etype
(Current_Scope
), Available_View
(Etyp
));
3480 -- If this is the proper body of a stub, we must verify that the stub
3481 -- conforms to the body, and to the previous spec if one was present.
3482 -- We know already that the body conforms to that spec. This test is
3483 -- only required for subprograms that come from source.
3485 if Nkind
(Parent
(N
)) = N_Subunit
3486 and then Comes_From_Source
(N
)
3487 and then not Error_Posted
(Body_Id
)
3488 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
3489 N_Subprogram_Body_Stub
3492 Old_Id
: constant Entity_Id
:=
3494 (Specification
(Corresponding_Stub
(Parent
(N
))));
3496 Conformant
: Boolean := False;
3499 if No
(Spec_Id
) then
3500 Check_Fully_Conformant
(Body_Id
, Old_Id
);
3504 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
3506 if not Conformant
then
3508 -- The stub was taken to be a new declaration. Indicate that
3511 Set_Has_Completion
(Old_Id
, False);
3517 Set_Has_Completion
(Body_Id
);
3518 Check_Eliminated
(Body_Id
);
3520 -- Analyze any aspect specifications that appear on the subprogram body
3521 -- stub. Stop the analysis now as the stub does not have a declarative
3522 -- or a statement part, and it cannot be inlined.
3524 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3525 if Has_Aspects
(N
) then
3526 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
3532 -- Handle frontend inlining
3534 -- Note: Normally we don't do any inlining if expansion is off, since
3535 -- we won't generate code in any case. An exception arises in GNATprove
3536 -- mode where we want to expand some calls in place, even with expansion
3537 -- disabled, since the inlining eases formal verification.
3539 if not GNATprove_Mode
3540 and then Expander_Active
3541 and then Serious_Errors_Detected
= 0
3542 and then Present
(Spec_Id
)
3543 and then Has_Pragma_Inline
(Spec_Id
)
3545 -- Legacy implementation (relying on frontend inlining)
3547 if not Back_End_Inlining
then
3548 if (Has_Pragma_Inline_Always
(Spec_Id
)
3549 and then not Opt
.Disable_FE_Inline_Always
)
3551 (Has_Pragma_Inline
(Spec_Id
) and then Front_End_Inlining
3552 and then not Opt
.Disable_FE_Inline
)
3554 Build_Body_To_Inline
(N
, Spec_Id
);
3557 -- New implementation (relying on backend inlining)
3560 if Has_Pragma_Inline_Always
(Spec_Id
)
3561 or else Optimization_Level
> 0
3563 -- Handle function returning an unconstrained type
3565 if Comes_From_Source
(Body_Id
)
3566 and then Ekind
(Spec_Id
) = E_Function
3567 and then Returns_Unconstrained_Type
(Spec_Id
)
3569 -- If function builds in place, i.e. returns a limited type,
3570 -- inlining cannot be done.
3572 and then not Is_Limited_Type
(Etype
(Spec_Id
))
3574 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
3578 Subp_Body
: constant Node_Id
:=
3579 Unit_Declaration_Node
(Body_Id
);
3580 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
3583 -- Do not pass inlining to the backend if the subprogram
3584 -- has declarations or statements which cannot be inlined
3585 -- by the backend. This check is done here to emit an
3586 -- error instead of the generic warning message reported
3587 -- by the GCC backend (ie. "function might not be
3590 if Present
(Subp_Decl
)
3591 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
3595 elsif Has_Excluded_Statement
3598 (Handled_Statement_Sequence
(Subp_Body
)))
3602 -- If the backend inlining is available then at this
3603 -- stage we only have to mark the subprogram as inlined.
3604 -- The expander will take care of registering it in the
3605 -- table of subprograms inlined by the backend a part of
3606 -- processing calls to it (cf. Expand_Call)
3609 Set_Is_Inlined
(Spec_Id
);
3616 -- In GNATprove mode, inline only when there is a separate subprogram
3617 -- declaration for now, as inlining of subprogram bodies acting as
3618 -- declarations, or subprogram stubs, are not supported by frontend
3619 -- inlining. This inlining should occur after analysis of the body, so
3620 -- that it is known whether the value of SPARK_Mode applicable to the
3621 -- body, which can be defined by a pragma inside the body.
3623 elsif GNATprove_Mode
3624 and then Full_Analysis
3625 and then not Inside_A_Generic
3626 and then Present
(Spec_Id
)
3628 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
3629 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
3630 and then not Body_Has_Contract
3632 Build_Body_To_Inline
(N
, Spec_Id
);
3635 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
3636 -- of the specification we have to install the private withed units.
3637 -- This holds for child units as well.
3639 if Is_Compilation_Unit
(Body_Id
)
3640 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
3642 Install_Private_With_Clauses
(Body_Id
);
3645 Check_Anonymous_Return
;
3647 -- Set the Protected_Formal field of each extra formal of the protected
3648 -- subprogram to reference the corresponding extra formal of the
3649 -- subprogram that implements it. For regular formals this occurs when
3650 -- the protected subprogram's declaration is expanded, but the extra
3651 -- formals don't get created until the subprogram is frozen. We need to
3652 -- do this before analyzing the protected subprogram's body so that any
3653 -- references to the original subprogram's extra formals will be changed
3654 -- refer to the implementing subprogram's formals (see Expand_Formal).
3656 if Present
(Spec_Id
)
3657 and then Is_Protected_Type
(Scope
(Spec_Id
))
3658 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
3661 Impl_Subp
: constant Entity_Id
:=
3662 Protected_Body_Subprogram
(Spec_Id
);
3663 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
3664 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
3666 while Present
(Prot_Ext_Formal
) loop
3667 pragma Assert
(Present
(Impl_Ext_Formal
));
3668 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
3669 Next_Formal_With_Extras
(Prot_Ext_Formal
);
3670 Next_Formal_With_Extras
(Impl_Ext_Formal
);
3675 -- Now we can go on to analyze the body
3677 HSS
:= Handled_Statement_Sequence
(N
);
3678 Set_Actual_Subtypes
(N
, Current_Scope
);
3680 -- Add a declaration for the Protection object, renaming declarations
3681 -- for discriminals and privals and finally a declaration for the entry
3682 -- family index (if applicable). This form of early expansion is done
3683 -- when the Expander is active because Install_Private_Data_Declarations
3684 -- references entities which were created during regular expansion. The
3685 -- subprogram entity must come from source, and not be an internally
3686 -- generated subprogram.
3689 and then Present
(Prot_Typ
)
3690 and then Present
(Spec_Id
)
3691 and then Comes_From_Source
(Spec_Id
)
3692 and then not Is_Eliminated
(Spec_Id
)
3694 Install_Private_Data_Declarations
3695 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
3698 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
3699 -- may now appear in parameter and result profiles. Since the analysis
3700 -- of a subprogram body may use the parameter and result profile of the
3701 -- spec, swap any limited views with their non-limited counterpart.
3703 if Ada_Version
>= Ada_2012
then
3704 Exchange_Limited_Views
(Spec_Id
);
3707 -- Analyze any aspect specifications that appear on the subprogram body
3709 if Has_Aspects
(N
) then
3710 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
3713 Analyze_Declarations
(Declarations
(N
));
3715 -- Verify that the SPARK_Mode of the body agrees with that of its spec
3717 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
3718 if Present
(SPARK_Pragma
(Spec_Id
)) then
3719 if Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Spec_Id
)) = Off
3721 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
3723 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3724 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
3725 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
3727 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
3730 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
3734 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
3735 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
3736 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
3738 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
3742 -- When a subprogram body appears inside a package, its contract is
3743 -- analyzed at the end of the package body declarations. This is due
3744 -- to the delay with respect of the package contract upon which the
3745 -- body contract may depend. When the subprogram body is stand alone
3746 -- and acts as a compilation unit, this delay is not necessary.
3748 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3749 Analyze_Subprogram_Body_Contract
(Body_Id
);
3752 -- Deal with preconditions, [refined] postconditions, Contract_Cases,
3753 -- invariants and predicates associated with body and its spec. Since
3754 -- there is no routine Expand_Declarations which would otherwise deal
3755 -- with the contract expansion, generate all necessary mechanisms to
3756 -- verify the contract assertions now.
3758 Expand_Subprogram_Contract
(N
);
3760 -- If SPARK_Mode for body is not On, disable frontend inlining for this
3761 -- subprogram in GNATprove mode, as its body should not be analyzed.
3764 and then GNATprove_Mode
3765 and then Present
(Spec_Id
)
3766 and then Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Declaration
3768 Set_Body_To_Inline
(Parent
(Parent
(Spec_Id
)), Empty
);
3769 Set_Is_Inlined_Always
(Spec_Id
, False);
3772 -- Check completion, and analyze the statements
3775 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
3778 -- Deal with end of scope processing for the body
3780 Process_End_Label
(HSS
, 't', Current_Scope
);
3782 Check_Subprogram_Order
(N
);
3783 Set_Analyzed
(Body_Id
);
3785 -- If we have a separate spec, then the analysis of the declarations
3786 -- caused the entities in the body to be chained to the spec id, but
3787 -- we want them chained to the body id. Only the formal parameters
3788 -- end up chained to the spec id in this case.
3790 if Present
(Spec_Id
) then
3792 -- We must conform to the categorization of our spec
3794 Validate_Categorization_Dependency
(N
, Spec_Id
);
3796 -- And if this is a child unit, the parent units must conform
3798 if Is_Child_Unit
(Spec_Id
) then
3799 Validate_Categorization_Dependency
3800 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
3803 -- Here is where we move entities from the spec to the body
3805 -- Case where there are entities that stay with the spec
3807 if Present
(Last_Real_Spec_Entity
) then
3809 -- No body entities (happens when the only real spec entities come
3810 -- from precondition and postcondition pragmas).
3812 if No
(Last_Entity
(Body_Id
)) then
3813 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
3815 -- Body entities present (formals), so chain stuff past them
3819 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
3822 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
3823 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3824 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
3826 -- Case where there are no spec entities, in this case there can be
3827 -- no body entities either, so just move everything.
3829 -- If the body is generated for an expression function, it may have
3830 -- been preanalyzed already, if 'access was applied to it.
3833 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
3834 N_Expression_Function
3836 pragma Assert
(No
(Last_Entity
(Body_Id
)));
3840 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
3841 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
3842 Set_First_Entity
(Spec_Id
, Empty
);
3843 Set_Last_Entity
(Spec_Id
, Empty
);
3847 Check_Missing_Return
;
3849 -- Now we are going to check for variables that are never modified in
3850 -- the body of the procedure. But first we deal with a special case
3851 -- where we want to modify this check. If the body of the subprogram
3852 -- starts with a raise statement or its equivalent, or if the body
3853 -- consists entirely of a null statement, then it is pretty obvious that
3854 -- it is OK to not reference the parameters. For example, this might be
3855 -- the following common idiom for a stubbed function: statement of the
3856 -- procedure raises an exception. In particular this deals with the
3857 -- common idiom of a stubbed function, which appears something like:
3859 -- function F (A : Integer) return Some_Type;
3862 -- raise Program_Error;
3866 -- Here the purpose of X is simply to satisfy the annoying requirement
3867 -- in Ada that there be at least one return, and we certainly do not
3868 -- want to go posting warnings on X that it is not initialized. On
3869 -- the other hand, if X is entirely unreferenced that should still
3872 -- What we do is to detect these cases, and if we find them, flag the
3873 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
3874 -- suppress unwanted warnings. For the case of the function stub above
3875 -- we have a special test to set X as apparently assigned to suppress
3882 -- Skip initial labels (for one thing this occurs when we are in
3883 -- front end ZCX mode, but in any case it is irrelevant), and also
3884 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
3886 Stm
:= First
(Statements
(HSS
));
3887 while Nkind
(Stm
) = N_Label
3888 or else Nkind
(Stm
) in N_Push_xxx_Label
3893 -- Do the test on the original statement before expansion
3896 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
3899 -- If explicit raise statement, turn on flag
3901 if Nkind
(Ostm
) = N_Raise_Statement
then
3902 Set_Trivial_Subprogram
(Stm
);
3904 -- If null statement, and no following statements, turn on flag
3906 elsif Nkind
(Stm
) = N_Null_Statement
3907 and then Comes_From_Source
(Stm
)
3908 and then No
(Next
(Stm
))
3910 Set_Trivial_Subprogram
(Stm
);
3912 -- Check for explicit call cases which likely raise an exception
3914 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
3915 if Is_Entity_Name
(Name
(Ostm
)) then
3917 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
3920 -- If the procedure is marked No_Return, then likely it
3921 -- raises an exception, but in any case it is not coming
3922 -- back here, so turn on the flag.
3925 and then Ekind
(Ent
) = E_Procedure
3926 and then No_Return
(Ent
)
3928 Set_Trivial_Subprogram
(Stm
);
3936 -- Check for variables that are never modified
3942 -- If there is a separate spec, then transfer Never_Set_In_Source
3943 -- flags from out parameters to the corresponding entities in the
3944 -- body. The reason we do that is we want to post error flags on
3945 -- the body entities, not the spec entities.
3947 if Present
(Spec_Id
) then
3948 E1
:= First_Entity
(Spec_Id
);
3949 while Present
(E1
) loop
3950 if Ekind
(E1
) = E_Out_Parameter
then
3951 E2
:= First_Entity
(Body_Id
);
3952 while Present
(E2
) loop
3953 exit when Chars
(E1
) = Chars
(E2
);
3957 if Present
(E2
) then
3958 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
3966 -- Check references in body
3968 Check_References
(Body_Id
);
3971 -- Check for nested subprogram, and mark outer level subprogram if so
3977 if Present
(Spec_Id
) then
3984 Ent
:= Enclosing_Subprogram
(Ent
);
3985 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
3988 if Present
(Ent
) then
3989 Set_Has_Nested_Subprogram
(Ent
);
3992 end Analyze_Subprogram_Body_Helper
;
3994 ---------------------------------
3995 -- Analyze_Subprogram_Contract --
3996 ---------------------------------
3998 procedure Analyze_Subprogram_Contract
(Subp_Id
: Entity_Id
) is
3999 Items
: constant Node_Id
:= Contract
(Subp_Id
);
4000 Depends
: Node_Id
:= Empty
;
4001 Global
: Node_Id
:= Empty
;
4002 Mode
: SPARK_Mode_Type
;
4007 -- Due to the timing of contract analysis, delayed pragmas may be
4008 -- subject to the wrong SPARK_Mode, usually that of the enclosing
4009 -- context. To remedy this, restore the original SPARK_Mode of the
4010 -- related subprogram body.
4012 Save_SPARK_Mode_And_Set
(Subp_Id
, Mode
);
4014 -- All subprograms carry a contract, but for some it is not significant
4015 -- and should not be processed.
4017 if not Has_Significant_Contract
(Subp_Id
) then
4020 elsif Present
(Items
) then
4022 -- Analyze pre- and postconditions
4024 Prag
:= Pre_Post_Conditions
(Items
);
4025 while Present
(Prag
) loop
4026 Analyze_Pre_Post_Condition_In_Decl_Part
(Prag
);
4027 Prag
:= Next_Pragma
(Prag
);
4030 -- Analyze contract-cases and test-cases
4032 Prag
:= Contract_Test_Cases
(Items
);
4033 while Present
(Prag
) loop
4034 Prag_Nam
:= Pragma_Name
(Prag
);
4036 if Prag_Nam
= Name_Contract_Cases
then
4037 Analyze_Contract_Cases_In_Decl_Part
(Prag
);
4039 pragma Assert
(Prag_Nam
= Name_Test_Case
);
4040 Analyze_Test_Case_In_Decl_Part
(Prag
);
4043 Prag
:= Next_Pragma
(Prag
);
4046 -- Analyze classification pragmas
4048 Prag
:= Classifications
(Items
);
4049 while Present
(Prag
) loop
4050 Prag_Nam
:= Pragma_Name
(Prag
);
4052 if Prag_Nam
= Name_Depends
then
4055 elsif Prag_Nam
= Name_Global
then
4058 -- Note that pragma Extensions_Visible has already been analyzed
4062 Prag
:= Next_Pragma
(Prag
);
4065 -- Analyze Global first as Depends may mention items classified in
4066 -- the global categorization.
4068 if Present
(Global
) then
4069 Analyze_Global_In_Decl_Part
(Global
);
4072 -- Depends must be analyzed after Global in order to see the modes of
4073 -- all global items.
4075 if Present
(Depends
) then
4076 Analyze_Depends_In_Decl_Part
(Depends
);
4079 -- Ensure that the contract cases or postconditions mention 'Result
4080 -- or define a post-state.
4082 Check_Result_And_Post_State
(Subp_Id
);
4085 -- Restore the SPARK_Mode of the enclosing context after all delayed
4086 -- pragmas have been analyzed.
4088 Restore_SPARK_Mode
(Mode
);
4089 end Analyze_Subprogram_Contract
;
4091 ------------------------------------
4092 -- Analyze_Subprogram_Declaration --
4093 ------------------------------------
4095 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4096 Scop
: constant Entity_Id
:= Current_Scope
;
4097 Designator
: Entity_Id
;
4099 Is_Completion
: Boolean;
4100 -- Indicates whether a null procedure declaration is a completion
4103 -- The subprogram declaration may be subject to pragma Ghost with policy
4104 -- Ignore. Set the mode now to ensure that any nodes generated during
4105 -- analysis and expansion are properly flagged as ignored Ghost.
4109 -- Null procedures are not allowed in SPARK
4111 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4112 and then Null_Present
(Specification
(N
))
4114 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4116 -- Null procedures are allowed in protected types, following the
4117 -- recent AI12-0147.
4119 if Is_Protected_Type
(Current_Scope
)
4120 and then Ada_Version
< Ada_2012
4122 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4125 Analyze_Null_Procedure
(N
, Is_Completion
);
4127 if Is_Completion
then
4129 -- The null procedure acts as a body, nothing further is needed
4135 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4137 -- A reference may already have been generated for the unit name, in
4138 -- which case the following call is redundant. However it is needed for
4139 -- declarations that are the rewriting of an expression function.
4141 Generate_Definition
(Designator
);
4143 -- Set SPARK mode from current context (may be overwritten later with
4144 -- explicit pragma).
4146 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4147 Set_SPARK_Pragma_Inherited
(Designator
);
4149 -- A subprogram declared within a Ghost region is automatically Ghost
4150 -- (SPARK RM 6.9(2)).
4152 if Comes_From_Source
(Designator
) and then Ghost_Mode
> None
then
4153 Set_Is_Ghost_Entity
(Designator
);
4156 if Debug_Flag_C
then
4157 Write_Str
("==> subprogram spec ");
4158 Write_Name
(Chars
(Designator
));
4159 Write_Str
(" from ");
4160 Write_Location
(Sloc
(N
));
4165 Validate_RCI_Subprogram_Declaration
(N
);
4166 New_Overloaded_Entity
(Designator
);
4167 Check_Delayed_Subprogram
(Designator
);
4169 -- If the type of the first formal of the current subprogram is a non-
4170 -- generic tagged private type, mark the subprogram as being a private
4171 -- primitive. Ditto if this is a function with controlling result, and
4172 -- the return type is currently private. In both cases, the type of the
4173 -- controlling argument or result must be in the current scope for the
4174 -- operation to be primitive.
4176 if Has_Controlling_Result
(Designator
)
4177 and then Is_Private_Type
(Etype
(Designator
))
4178 and then Scope
(Etype
(Designator
)) = Current_Scope
4179 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4181 Set_Is_Private_Primitive
(Designator
);
4183 elsif Present
(First_Formal
(Designator
)) then
4185 Formal_Typ
: constant Entity_Id
:=
4186 Etype
(First_Formal
(Designator
));
4188 Set_Is_Private_Primitive
(Designator
,
4189 Is_Tagged_Type
(Formal_Typ
)
4190 and then Scope
(Formal_Typ
) = Current_Scope
4191 and then Is_Private_Type
(Formal_Typ
)
4192 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4196 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4199 if Ada_Version
>= Ada_2005
4200 and then Comes_From_Source
(N
)
4201 and then Is_Dispatching_Operation
(Designator
)
4208 if Has_Controlling_Result
(Designator
) then
4209 Etyp
:= Etype
(Designator
);
4212 E
:= First_Entity
(Designator
);
4214 and then Is_Formal
(E
)
4215 and then not Is_Controlling_Formal
(E
)
4223 if Is_Access_Type
(Etyp
) then
4224 Etyp
:= Directly_Designated_Type
(Etyp
);
4227 if Is_Interface
(Etyp
)
4228 and then not Is_Abstract_Subprogram
(Designator
)
4229 and then not (Ekind
(Designator
) = E_Procedure
4230 and then Null_Present
(Specification
(N
)))
4232 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4234 -- Specialize error message based on procedures vs. functions,
4235 -- since functions can't be null subprograms.
4237 if Ekind
(Designator
) = E_Procedure
then
4239 ("interface procedure % must be abstract or null", N
);
4242 ("interface function % must be abstract", N
);
4248 -- What is the following code for, it used to be
4250 -- ??? Set_Suppress_Elaboration_Checks
4251 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4253 -- The following seems equivalent, but a bit dubious
4255 if Elaboration_Checks_Suppressed
(Designator
) then
4256 Set_Kill_Elaboration_Checks
(Designator
);
4259 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4260 Set_Categorization_From_Scope
(Designator
, Scop
);
4263 -- For a compilation unit, check for library-unit pragmas
4265 Push_Scope
(Designator
);
4266 Set_Categorization_From_Pragmas
(N
);
4267 Validate_Categorization_Dependency
(N
, Designator
);
4271 -- For a compilation unit, set body required. This flag will only be
4272 -- reset if a valid Import or Interface pragma is processed later on.
4274 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4275 Set_Body_Required
(Parent
(N
), True);
4277 if Ada_Version
>= Ada_2005
4278 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4279 and then Null_Present
(Specification
(N
))
4282 ("null procedure cannot be declared at library level", N
);
4286 Generate_Reference_To_Formals
(Designator
);
4287 Check_Eliminated
(Designator
);
4289 if Debug_Flag_C
then
4291 Write_Str
("<== subprogram spec ");
4292 Write_Name
(Chars
(Designator
));
4293 Write_Str
(" from ");
4294 Write_Location
(Sloc
(N
));
4298 if Is_Protected_Type
(Current_Scope
) then
4300 -- Indicate that this is a protected operation, because it may be
4301 -- used in subsequent declarations within the protected type.
4303 Set_Convention
(Designator
, Convention_Protected
);
4306 List_Inherited_Pre_Post_Aspects
(Designator
);
4308 if Has_Aspects
(N
) then
4309 Analyze_Aspect_Specifications
(N
, Designator
);
4311 end Analyze_Subprogram_Declaration
;
4313 --------------------------------------
4314 -- Analyze_Subprogram_Specification --
4315 --------------------------------------
4317 -- Reminder: N here really is a subprogram specification (not a subprogram
4318 -- declaration). This procedure is called to analyze the specification in
4319 -- both subprogram bodies and subprogram declarations (specs).
4321 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4322 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4323 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4325 -- Start of processing for Analyze_Subprogram_Specification
4328 -- User-defined operator is not allowed in SPARK, except as a renaming
4330 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4331 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4333 Check_SPARK_05_Restriction
4334 ("user-defined operator is not allowed", N
);
4337 -- Proceed with analysis. Do not emit a cross-reference entry if the
4338 -- specification comes from an expression function, because it may be
4339 -- the completion of a previous declaration. It is is not, the cross-
4340 -- reference entry will be emitted for the new subprogram declaration.
4342 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4343 Generate_Definition
(Designator
);
4346 if Nkind
(N
) = N_Function_Specification
then
4347 Set_Ekind
(Designator
, E_Function
);
4348 Set_Mechanism
(Designator
, Default_Mechanism
);
4350 Set_Ekind
(Designator
, E_Procedure
);
4351 Set_Etype
(Designator
, Standard_Void_Type
);
4354 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4355 -- those subprograms which could be inlined in GNATprove mode (because
4356 -- Body_To_Inline is non-Empty) but cannot be inlined.
4358 if GNATprove_Mode
then
4359 Set_Is_Inlined_Always
(Designator
);
4362 -- Introduce new scope for analysis of the formals and the return type
4364 Set_Scope
(Designator
, Current_Scope
);
4366 if Present
(Formals
) then
4367 Push_Scope
(Designator
);
4368 Process_Formals
(Formals
, N
);
4370 -- Check dimensions in N for formals with default expression
4372 Analyze_Dimension_Formals
(N
, Formals
);
4374 -- Ada 2005 (AI-345): If this is an overriding operation of an
4375 -- inherited interface operation, and the controlling type is
4376 -- a synchronized type, replace the type with its corresponding
4377 -- record, to match the proper signature of an overriding operation.
4378 -- Same processing for an access parameter whose designated type is
4379 -- derived from a synchronized interface.
4381 if Ada_Version
>= Ada_2005
then
4384 Formal_Typ
: Entity_Id
;
4385 Rec_Typ
: Entity_Id
;
4386 Desig_Typ
: Entity_Id
;
4389 Formal
:= First_Formal
(Designator
);
4390 while Present
(Formal
) loop
4391 Formal_Typ
:= Etype
(Formal
);
4393 if Is_Concurrent_Type
(Formal_Typ
)
4394 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4396 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4398 if Present
(Interfaces
(Rec_Typ
)) then
4399 Set_Etype
(Formal
, Rec_Typ
);
4402 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4403 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4405 if Is_Concurrent_Type
(Desig_Typ
)
4406 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4408 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4410 if Present
(Interfaces
(Rec_Typ
)) then
4411 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
4416 Next_Formal
(Formal
);
4423 -- The subprogram scope is pushed and popped around the processing of
4424 -- the return type for consistency with call above to Process_Formals
4425 -- (which itself can call Analyze_Return_Type), and to ensure that any
4426 -- itype created for the return type will be associated with the proper
4429 elsif Nkind
(N
) = N_Function_Specification
then
4430 Push_Scope
(Designator
);
4431 Analyze_Return_Type
(N
);
4437 if Nkind
(N
) = N_Function_Specification
then
4439 -- Deal with operator symbol case
4441 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
4442 Valid_Operator_Definition
(Designator
);
4445 May_Need_Actuals
(Designator
);
4447 -- Ada 2005 (AI-251): If the return type is abstract, verify that
4448 -- the subprogram is abstract also. This does not apply to renaming
4449 -- declarations, where abstractness is inherited, and to subprogram
4450 -- bodies generated for stream operations, which become renamings as
4453 -- In case of primitives associated with abstract interface types
4454 -- the check is applied later (see Analyze_Subprogram_Declaration).
4456 if not Nkind_In
(Original_Node
(Parent
(N
)),
4457 N_Subprogram_Renaming_Declaration
,
4458 N_Abstract_Subprogram_Declaration
,
4459 N_Formal_Abstract_Subprogram_Declaration
)
4461 if Is_Abstract_Type
(Etype
(Designator
))
4462 and then not Is_Interface
(Etype
(Designator
))
4465 ("function that returns abstract type must be abstract", N
);
4467 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
4468 -- access result whose designated type is abstract.
4470 elsif Nkind
(Result_Definition
(N
)) = N_Access_Definition
4472 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
4473 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
4474 and then Ada_Version
>= Ada_2012
4476 Error_Msg_N
("function whose access result designates "
4477 & "abstract type must be abstract", N
);
4483 end Analyze_Subprogram_Specification
;
4485 -----------------------
4486 -- Check_Conformance --
4487 -----------------------
4489 procedure Check_Conformance
4490 (New_Id
: Entity_Id
;
4492 Ctype
: Conformance_Type
;
4494 Conforms
: out Boolean;
4495 Err_Loc
: Node_Id
:= Empty
;
4496 Get_Inst
: Boolean := False;
4497 Skip_Controlling_Formals
: Boolean := False)
4499 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
4500 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
4501 -- If Errmsg is True, then processing continues to post an error message
4502 -- for conformance error on given node. Two messages are output. The
4503 -- first message points to the previous declaration with a general "no
4504 -- conformance" message. The second is the detailed reason, supplied as
4505 -- Msg. The parameter N provide information for a possible & insertion
4506 -- in the message, and also provides the location for posting the
4507 -- message in the absence of a specified Err_Loc location.
4509 -----------------------
4510 -- Conformance_Error --
4511 -----------------------
4513 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
4520 if No
(Err_Loc
) then
4526 Error_Msg_Sloc
:= Sloc
(Old_Id
);
4529 when Type_Conformant
=>
4530 Error_Msg_N
-- CODEFIX
4531 ("not type conformant with declaration#!", Enode
);
4533 when Mode_Conformant
=>
4534 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4536 ("not mode conformant with operation inherited#!",
4540 ("not mode conformant with declaration#!", Enode
);
4543 when Subtype_Conformant
=>
4544 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4546 ("not subtype conformant with operation inherited#!",
4550 ("not subtype conformant with declaration#!", Enode
);
4553 when Fully_Conformant
=>
4554 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
4555 Error_Msg_N
-- CODEFIX
4556 ("not fully conformant with operation inherited#!",
4559 Error_Msg_N
-- CODEFIX
4560 ("not fully conformant with declaration#!", Enode
);
4564 Error_Msg_NE
(Msg
, Enode
, N
);
4566 end Conformance_Error
;
4570 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
4571 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
4572 Old_Formal
: Entity_Id
;
4573 New_Formal
: Entity_Id
;
4574 Access_Types_Match
: Boolean;
4575 Old_Formal_Base
: Entity_Id
;
4576 New_Formal_Base
: Entity_Id
;
4578 -- Start of processing for Check_Conformance
4583 -- We need a special case for operators, since they don't appear
4586 if Ctype
= Type_Conformant
then
4587 if Ekind
(New_Id
) = E_Operator
4588 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
4594 -- If both are functions/operators, check return types conform
4596 if Old_Type
/= Standard_Void_Type
4598 New_Type
/= Standard_Void_Type
4600 -- If we are checking interface conformance we omit controlling
4601 -- arguments and result, because we are only checking the conformance
4602 -- of the remaining parameters.
4604 if Has_Controlling_Result
(Old_Id
)
4605 and then Has_Controlling_Result
(New_Id
)
4606 and then Skip_Controlling_Formals
4610 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
4611 if Ctype
>= Subtype_Conformant
4612 and then not Predicates_Match
(Old_Type
, New_Type
)
4615 ("\predicate of return type does not match!", New_Id
);
4618 ("\return type does not match!", New_Id
);
4624 -- Ada 2005 (AI-231): In case of anonymous access types check the
4625 -- null-exclusion and access-to-constant attributes match.
4627 if Ada_Version
>= Ada_2005
4628 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
4630 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
4631 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
4632 Is_Access_Constant
(Etype
(New_Type
)))
4634 Conformance_Error
("\return type does not match!", New_Id
);
4638 -- If either is a function/operator and the other isn't, error
4640 elsif Old_Type
/= Standard_Void_Type
4641 or else New_Type
/= Standard_Void_Type
4643 Conformance_Error
("\functions can only match functions!", New_Id
);
4647 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
4648 -- If this is a renaming as body, refine error message to indicate that
4649 -- the conflict is with the original declaration. If the entity is not
4650 -- frozen, the conventions don't have to match, the one of the renamed
4651 -- entity is inherited.
4653 if Ctype
>= Subtype_Conformant
then
4654 if Convention
(Old_Id
) /= Convention
(New_Id
) then
4655 if not Is_Frozen
(New_Id
) then
4658 elsif Present
(Err_Loc
)
4659 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
4660 and then Present
(Corresponding_Spec
(Err_Loc
))
4662 Error_Msg_Name_1
:= Chars
(New_Id
);
4664 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
4665 Conformance_Error
("\prior declaration for% has convention %!");
4668 Conformance_Error
("\calling conventions do not match!");
4673 elsif Is_Formal_Subprogram
(Old_Id
)
4674 or else Is_Formal_Subprogram
(New_Id
)
4676 Conformance_Error
("\formal subprograms not allowed!");
4679 -- Pragma Ghost behaves as a convention in the context of subtype
4680 -- conformance (SPARK RM 6.9(5)). Do not check internally generated
4681 -- subprograms as their spec may reside in a Ghost region and their
4682 -- body not, or vice versa.
4684 elsif Comes_From_Source
(Old_Id
)
4685 and then Comes_From_Source
(New_Id
)
4686 and then Is_Ghost_Entity
(Old_Id
) /= Is_Ghost_Entity
(New_Id
)
4688 Conformance_Error
("\ghost modes do not match!");
4693 -- Deal with parameters
4695 -- Note: we use the entity information, rather than going directly
4696 -- to the specification in the tree. This is not only simpler, but
4697 -- absolutely necessary for some cases of conformance tests between
4698 -- operators, where the declaration tree simply does not exist.
4700 Old_Formal
:= First_Formal
(Old_Id
);
4701 New_Formal
:= First_Formal
(New_Id
);
4702 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
4703 if Is_Controlling_Formal
(Old_Formal
)
4704 and then Is_Controlling_Formal
(New_Formal
)
4705 and then Skip_Controlling_Formals
4707 -- The controlling formals will have different types when
4708 -- comparing an interface operation with its match, but both
4709 -- or neither must be access parameters.
4711 if Is_Access_Type
(Etype
(Old_Formal
))
4713 Is_Access_Type
(Etype
(New_Formal
))
4715 goto Skip_Controlling_Formal
;
4718 ("\access parameter does not match!", New_Formal
);
4722 -- Ada 2012: Mode conformance also requires that formal parameters
4723 -- be both aliased, or neither.
4725 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
4726 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
4728 ("\aliased parameter mismatch!", New_Formal
);
4732 if Ctype
= Fully_Conformant
then
4734 -- Names must match. Error message is more accurate if we do
4735 -- this before checking that the types of the formals match.
4737 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
4738 Conformance_Error
("\name& does not match!", New_Formal
);
4740 -- Set error posted flag on new formal as well to stop
4741 -- junk cascaded messages in some cases.
4743 Set_Error_Posted
(New_Formal
);
4747 -- Null exclusion must match
4749 if Null_Exclusion_Present
(Parent
(Old_Formal
))
4751 Null_Exclusion_Present
(Parent
(New_Formal
))
4753 -- Only give error if both come from source. This should be
4754 -- investigated some time, since it should not be needed ???
4756 if Comes_From_Source
(Old_Formal
)
4758 Comes_From_Source
(New_Formal
)
4761 ("\null exclusion for& does not match", New_Formal
);
4763 -- Mark error posted on the new formal to avoid duplicated
4764 -- complaint about types not matching.
4766 Set_Error_Posted
(New_Formal
);
4771 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
4772 -- case occurs whenever a subprogram is being renamed and one of its
4773 -- parameters imposes a null exclusion. For example:
4775 -- type T is null record;
4776 -- type Acc_T is access T;
4777 -- subtype Acc_T_Sub is Acc_T;
4779 -- procedure P (Obj : not null Acc_T_Sub); -- itype
4780 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
4783 Old_Formal_Base
:= Etype
(Old_Formal
);
4784 New_Formal_Base
:= Etype
(New_Formal
);
4787 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
4788 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
4791 Access_Types_Match
:= Ada_Version
>= Ada_2005
4793 -- Ensure that this rule is only applied when New_Id is a
4794 -- renaming of Old_Id.
4796 and then Nkind
(Parent
(Parent
(New_Id
))) =
4797 N_Subprogram_Renaming_Declaration
4798 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
4799 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
4800 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
4802 -- Now handle the allowed access-type case
4804 and then Is_Access_Type
(Old_Formal_Base
)
4805 and then Is_Access_Type
(New_Formal_Base
)
4807 -- The type kinds must match. The only exception occurs with
4808 -- multiple generics of the form:
4811 -- type F is private; type A is private;
4812 -- type F_Ptr is access F; type A_Ptr is access A;
4813 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
4814 -- package F_Pack is ... package A_Pack is
4815 -- package F_Inst is
4816 -- new F_Pack (A, A_Ptr, A_P);
4818 -- When checking for conformance between the parameters of A_P
4819 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
4820 -- because the compiler has transformed A_Ptr into a subtype of
4821 -- F_Ptr. We catch this case in the code below.
4823 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
4825 (Is_Generic_Type
(Old_Formal_Base
)
4826 and then Is_Generic_Type
(New_Formal_Base
)
4827 and then Is_Internal
(New_Formal_Base
)
4828 and then Etype
(Etype
(New_Formal_Base
)) =
4830 and then Directly_Designated_Type
(Old_Formal_Base
) =
4831 Directly_Designated_Type
(New_Formal_Base
)
4832 and then ((Is_Itype
(Old_Formal_Base
)
4833 and then Can_Never_Be_Null
(Old_Formal_Base
))
4835 (Is_Itype
(New_Formal_Base
)
4836 and then Can_Never_Be_Null
(New_Formal_Base
)));
4838 -- Types must always match. In the visible part of an instance,
4839 -- usual overloading rules for dispatching operations apply, and
4840 -- we check base types (not the actual subtypes).
4842 if In_Instance_Visible_Part
4843 and then Is_Dispatching_Operation
(New_Id
)
4845 if not Conforming_Types
4846 (T1
=> Base_Type
(Etype
(Old_Formal
)),
4847 T2
=> Base_Type
(Etype
(New_Formal
)),
4849 Get_Inst
=> Get_Inst
)
4850 and then not Access_Types_Match
4852 Conformance_Error
("\type of & does not match!", New_Formal
);
4856 elsif not Conforming_Types
4857 (T1
=> Old_Formal_Base
,
4858 T2
=> New_Formal_Base
,
4860 Get_Inst
=> Get_Inst
)
4861 and then not Access_Types_Match
4863 -- Don't give error message if old type is Any_Type. This test
4864 -- avoids some cascaded errors, e.g. in case of a bad spec.
4866 if Errmsg
and then Old_Formal_Base
= Any_Type
then
4869 if Ctype
>= Subtype_Conformant
4871 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
4874 ("\predicate of & does not match!", New_Formal
);
4877 ("\type of & does not match!", New_Formal
);
4884 -- For mode conformance, mode must match
4886 if Ctype
>= Mode_Conformant
then
4887 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
4888 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
4889 or else not Is_Primitive_Wrapper
(New_Id
)
4891 Conformance_Error
("\mode of & does not match!", New_Formal
);
4895 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
4897 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
4899 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
4902 ("\mode of & does not match!", New_Formal
);
4909 -- Part of mode conformance for access types is having the same
4910 -- constant modifier.
4912 elsif Access_Types_Match
4913 and then Is_Access_Constant
(Old_Formal_Base
) /=
4914 Is_Access_Constant
(New_Formal_Base
)
4917 ("\constant modifier does not match!", New_Formal
);
4922 if Ctype
>= Subtype_Conformant
then
4924 -- Ada 2005 (AI-231): In case of anonymous access types check
4925 -- the null-exclusion and access-to-constant attributes must
4926 -- match. For null exclusion, we test the types rather than the
4927 -- formals themselves, since the attribute is only set reliably
4928 -- on the formals in the Ada 95 case, and we exclude the case
4929 -- where Old_Formal is marked as controlling, to avoid errors
4930 -- when matching completing bodies with dispatching declarations
4931 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
4933 if Ada_Version
>= Ada_2005
4934 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
4935 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
4937 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
4938 Can_Never_Be_Null
(Etype
(New_Formal
))
4940 not Is_Controlling_Formal
(Old_Formal
))
4942 Is_Access_Constant
(Etype
(Old_Formal
)) /=
4943 Is_Access_Constant
(Etype
(New_Formal
)))
4945 -- Do not complain if error already posted on New_Formal. This
4946 -- avoids some redundant error messages.
4948 and then not Error_Posted
(New_Formal
)
4950 -- It is allowed to omit the null-exclusion in case of stream
4951 -- attribute subprograms. We recognize stream subprograms
4952 -- through their TSS-generated suffix.
4955 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
4958 if TSS_Name
/= TSS_Stream_Read
4959 and then TSS_Name
/= TSS_Stream_Write
4960 and then TSS_Name
/= TSS_Stream_Input
4961 and then TSS_Name
/= TSS_Stream_Output
4963 -- Here we have a definite conformance error. It is worth
4964 -- special casing the error message for the case of a
4965 -- controlling formal (which excludes null).
4967 if Is_Controlling_Formal
(New_Formal
) then
4968 Error_Msg_Node_2
:= Scope
(New_Formal
);
4970 ("\controlling formal & of & excludes null, "
4971 & "declaration must exclude null as well",
4974 -- Normal case (couldn't we give more detail here???)
4978 ("\type of & does not match!", New_Formal
);
4987 -- Full conformance checks
4989 if Ctype
= Fully_Conformant
then
4991 -- We have checked already that names match
4993 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
4995 -- Check default expressions for in parameters
4998 NewD
: constant Boolean :=
4999 Present
(Default_Value
(New_Formal
));
5000 OldD
: constant Boolean :=
5001 Present
(Default_Value
(Old_Formal
));
5003 if NewD
or OldD
then
5005 -- The old default value has been analyzed because the
5006 -- current full declaration will have frozen everything
5007 -- before. The new default value has not been analyzed,
5008 -- so analyze it now before we check for conformance.
5011 Push_Scope
(New_Id
);
5012 Preanalyze_Spec_Expression
5013 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5017 if not (NewD
and OldD
)
5018 or else not Fully_Conformant_Expressions
5019 (Default_Value
(Old_Formal
),
5020 Default_Value
(New_Formal
))
5023 ("\default expression for & does not match!",
5032 -- A couple of special checks for Ada 83 mode. These checks are
5033 -- skipped if either entity is an operator in package Standard,
5034 -- or if either old or new instance is not from the source program.
5036 if Ada_Version
= Ada_83
5037 and then Sloc
(Old_Id
) > Standard_Location
5038 and then Sloc
(New_Id
) > Standard_Location
5039 and then Comes_From_Source
(Old_Id
)
5040 and then Comes_From_Source
(New_Id
)
5043 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5044 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5047 -- Explicit IN must be present or absent in both cases. This
5048 -- test is required only in the full conformance case.
5050 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5051 and then Ctype
= Fully_Conformant
5054 ("\(Ada 83) IN must appear in both declarations",
5059 -- Grouping (use of comma in param lists) must be the same
5060 -- This is where we catch a misconformance like:
5063 -- A : Integer; B : Integer
5065 -- which are represented identically in the tree except
5066 -- for the setting of the flags More_Ids and Prev_Ids.
5068 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5069 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5072 ("\grouping of & does not match!", New_Formal
);
5078 -- This label is required when skipping controlling formals
5080 <<Skip_Controlling_Formal
>>
5082 Next_Formal
(Old_Formal
);
5083 Next_Formal
(New_Formal
);
5086 if Present
(Old_Formal
) then
5087 Conformance_Error
("\too few parameters!");
5090 elsif Present
(New_Formal
) then
5091 Conformance_Error
("\too many parameters!", New_Formal
);
5094 end Check_Conformance
;
5096 -----------------------
5097 -- Check_Conventions --
5098 -----------------------
5100 procedure Check_Conventions
(Typ
: Entity_Id
) is
5101 Ifaces_List
: Elist_Id
;
5103 procedure Check_Convention
(Op
: Entity_Id
);
5104 -- Verify that the convention of inherited dispatching operation Op is
5105 -- consistent among all subprograms it overrides. In order to minimize
5106 -- the search, Search_From is utilized to designate a specific point in
5107 -- the list rather than iterating over the whole list once more.
5109 ----------------------
5110 -- Check_Convention --
5111 ----------------------
5113 procedure Check_Convention
(Op
: Entity_Id
) is
5114 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5115 Iface_Conv
: Convention_Id
;
5116 Iface_Elmt
: Elmt_Id
;
5117 Iface_Prim_Elmt
: Elmt_Id
;
5118 Iface_Prim
: Entity_Id
;
5121 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5122 while Present
(Iface_Elmt
) loop
5124 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5125 while Present
(Iface_Prim_Elmt
) loop
5126 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5127 Iface_Conv
:= Convention
(Iface_Prim
);
5129 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5130 and then Iface_Conv
/= Op_Conv
5133 ("inconsistent conventions in primitive operations", Typ
);
5135 Error_Msg_Name_1
:= Chars
(Op
);
5136 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5137 Error_Msg_Sloc
:= Sloc
(Op
);
5139 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5140 if not Present
(Overridden_Operation
(Op
)) then
5141 Error_Msg_N
("\\primitive % defined #", Typ
);
5144 ("\\overriding operation % with "
5145 & "convention % defined #", Typ
);
5148 else pragma Assert
(Present
(Alias
(Op
)));
5149 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5150 Error_Msg_N
("\\inherited operation % with "
5151 & "convention % defined #", Typ
);
5154 Error_Msg_Name_1
:= Chars
(Op
);
5155 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5156 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5157 Error_Msg_N
("\\overridden operation % with "
5158 & "convention % defined #", Typ
);
5160 -- Avoid cascading errors
5165 Next_Elmt
(Iface_Prim_Elmt
);
5168 Next_Elmt
(Iface_Elmt
);
5170 end Check_Convention
;
5174 Prim_Op
: Entity_Id
;
5175 Prim_Op_Elmt
: Elmt_Id
;
5177 -- Start of processing for Check_Conventions
5180 if not Has_Interfaces
(Typ
) then
5184 Collect_Interfaces
(Typ
, Ifaces_List
);
5186 -- The algorithm checks every overriding dispatching operation against
5187 -- all the corresponding overridden dispatching operations, detecting
5188 -- differences in conventions.
5190 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5191 while Present
(Prim_Op_Elmt
) loop
5192 Prim_Op
:= Node
(Prim_Op_Elmt
);
5194 -- A small optimization: skip the predefined dispatching operations
5195 -- since they always have the same convention.
5197 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5198 Check_Convention
(Prim_Op
);
5201 Next_Elmt
(Prim_Op_Elmt
);
5203 end Check_Conventions
;
5205 ------------------------------
5206 -- Check_Delayed_Subprogram --
5207 ------------------------------
5209 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5212 procedure Possible_Freeze
(T
: Entity_Id
);
5213 -- T is the type of either a formal parameter or of the return type.
5214 -- If T is not yet frozen and needs a delayed freeze, then the
5215 -- subprogram itself must be delayed. If T is the limited view of an
5216 -- incomplete type the subprogram must be frozen as well, because
5217 -- T may depend on local types that have not been frozen yet.
5219 ---------------------
5220 -- Possible_Freeze --
5221 ---------------------
5223 procedure Possible_Freeze
(T
: Entity_Id
) is
5225 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5226 Set_Has_Delayed_Freeze
(Designator
);
5228 elsif Is_Access_Type
(T
)
5229 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5230 and then not Is_Frozen
(Designated_Type
(T
))
5232 Set_Has_Delayed_Freeze
(Designator
);
5234 elsif Ekind
(T
) = E_Incomplete_Type
5235 and then From_Limited_With
(T
)
5237 Set_Has_Delayed_Freeze
(Designator
);
5239 -- AI05-0151: In Ada 2012, Incomplete types can appear in the profile
5240 -- of a subprogram or entry declaration.
5242 elsif Ekind
(T
) = E_Incomplete_Type
5243 and then Ada_Version
>= Ada_2012
5245 Set_Has_Delayed_Freeze
(Designator
);
5248 end Possible_Freeze
;
5250 -- Start of processing for Check_Delayed_Subprogram
5253 -- All subprograms, including abstract subprograms, may need a freeze
5254 -- node if some formal type or the return type needs one.
5256 Possible_Freeze
(Etype
(Designator
));
5257 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5259 -- Need delayed freeze if any of the formal types themselves need
5260 -- a delayed freeze and are not yet frozen.
5262 F
:= First_Formal
(Designator
);
5263 while Present
(F
) loop
5264 Possible_Freeze
(Etype
(F
));
5265 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5269 -- Mark functions that return by reference. Note that it cannot be
5270 -- done for delayed_freeze subprograms because the underlying
5271 -- returned type may not be known yet (for private types)
5273 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5275 Typ
: constant Entity_Id
:= Etype
(Designator
);
5276 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5278 if Is_Limited_View
(Typ
) then
5279 Set_Returns_By_Ref
(Designator
);
5280 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5281 Set_Returns_By_Ref
(Designator
);
5285 end Check_Delayed_Subprogram
;
5287 ------------------------------------
5288 -- Check_Discriminant_Conformance --
5289 ------------------------------------
5291 procedure Check_Discriminant_Conformance
5296 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5297 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5298 New_Discr_Id
: Entity_Id
;
5299 New_Discr_Type
: Entity_Id
;
5301 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5302 -- Post error message for conformance error on given node. Two messages
5303 -- are output. The first points to the previous declaration with a
5304 -- general "no conformance" message. The second is the detailed reason,
5305 -- supplied as Msg. The parameter N provide information for a possible
5306 -- & insertion in the message.
5308 -----------------------
5309 -- Conformance_Error --
5310 -----------------------
5312 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5314 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5315 Error_Msg_N
-- CODEFIX
5316 ("not fully conformant with declaration#!", N
);
5317 Error_Msg_NE
(Msg
, N
, N
);
5318 end Conformance_Error
;
5320 -- Start of processing for Check_Discriminant_Conformance
5323 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5324 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5326 -- The subtype mark of the discriminant on the full type has not
5327 -- been analyzed so we do it here. For an access discriminant a new
5330 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5332 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5335 Analyze
(Discriminant_Type
(New_Discr
));
5336 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5338 -- Ada 2005: if the discriminant definition carries a null
5339 -- exclusion, create an itype to check properly for consistency
5340 -- with partial declaration.
5342 if Is_Access_Type
(New_Discr_Type
)
5343 and then Null_Exclusion_Present
(New_Discr
)
5346 Create_Null_Excluding_Itype
5347 (T
=> New_Discr_Type
,
5348 Related_Nod
=> New_Discr
,
5349 Scope_Id
=> Current_Scope
);
5353 if not Conforming_Types
5354 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5356 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5359 -- Treat the new discriminant as an occurrence of the old one,
5360 -- for navigation purposes, and fill in some semantic
5361 -- information, for completeness.
5363 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5364 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5365 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5370 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5371 Conformance_Error
("name & does not match!", New_Discr_Id
);
5375 -- Default expressions must match
5378 NewD
: constant Boolean :=
5379 Present
(Expression
(New_Discr
));
5380 OldD
: constant Boolean :=
5381 Present
(Expression
(Parent
(Old_Discr
)));
5384 if NewD
or OldD
then
5386 -- The old default value has been analyzed and expanded,
5387 -- because the current full declaration will have frozen
5388 -- everything before. The new default values have not been
5389 -- expanded, so expand now to check conformance.
5392 Preanalyze_Spec_Expression
5393 (Expression
(New_Discr
), New_Discr_Type
);
5396 if not (NewD
and OldD
)
5397 or else not Fully_Conformant_Expressions
5398 (Expression
(Parent
(Old_Discr
)),
5399 Expression
(New_Discr
))
5403 ("default expression for & does not match!",
5410 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
5412 if Ada_Version
= Ada_83
then
5414 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
5417 -- Grouping (use of comma in param lists) must be the same
5418 -- This is where we catch a misconformance like:
5421 -- A : Integer; B : Integer
5423 -- which are represented identically in the tree except
5424 -- for the setting of the flags More_Ids and Prev_Ids.
5426 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
5427 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
5430 ("grouping of & does not match!", New_Discr_Id
);
5436 Next_Discriminant
(Old_Discr
);
5440 if Present
(Old_Discr
) then
5441 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
5444 elsif Present
(New_Discr
) then
5446 ("too many discriminants!", Defining_Identifier
(New_Discr
));
5449 end Check_Discriminant_Conformance
;
5451 ----------------------------
5452 -- Check_Fully_Conformant --
5453 ----------------------------
5455 procedure Check_Fully_Conformant
5456 (New_Id
: Entity_Id
;
5458 Err_Loc
: Node_Id
:= Empty
)
5461 pragma Warnings
(Off
, Result
);
5464 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
5465 end Check_Fully_Conformant
;
5467 ---------------------------
5468 -- Check_Mode_Conformant --
5469 ---------------------------
5471 procedure Check_Mode_Conformant
5472 (New_Id
: Entity_Id
;
5474 Err_Loc
: Node_Id
:= Empty
;
5475 Get_Inst
: Boolean := False)
5478 pragma Warnings
(Off
, Result
);
5481 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
5482 end Check_Mode_Conformant
;
5484 --------------------------------
5485 -- Check_Overriding_Indicator --
5486 --------------------------------
5488 procedure Check_Overriding_Indicator
5490 Overridden_Subp
: Entity_Id
;
5491 Is_Primitive
: Boolean)
5497 -- No overriding indicator for literals
5499 if Ekind
(Subp
) = E_Enumeration_Literal
then
5502 elsif Ekind
(Subp
) = E_Entry
then
5503 Decl
:= Parent
(Subp
);
5505 -- No point in analyzing a malformed operator
5507 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
5508 and then Error_Posted
(Subp
)
5513 Decl
:= Unit_Declaration_Node
(Subp
);
5516 if Nkind_In
(Decl
, N_Subprogram_Body
,
5517 N_Subprogram_Body_Stub
,
5518 N_Subprogram_Declaration
,
5519 N_Abstract_Subprogram_Declaration
,
5520 N_Subprogram_Renaming_Declaration
)
5522 Spec
:= Specification
(Decl
);
5524 elsif Nkind
(Decl
) = N_Entry_Declaration
then
5531 -- The overriding operation is type conformant with the overridden one,
5532 -- but the names of the formals are not required to match. If the names
5533 -- appear permuted in the overriding operation, this is a possible
5534 -- source of confusion that is worth diagnosing. Controlling formals
5535 -- often carry names that reflect the type, and it is not worthwhile
5536 -- requiring that their names match.
5538 if Present
(Overridden_Subp
)
5539 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
5546 Form1
:= First_Formal
(Subp
);
5547 Form2
:= First_Formal
(Overridden_Subp
);
5549 -- If the overriding operation is a synchronized operation, skip
5550 -- the first parameter of the overridden operation, which is
5551 -- implicit in the new one. If the operation is declared in the
5552 -- body it is not primitive and all formals must match.
5554 if Is_Concurrent_Type
(Scope
(Subp
))
5555 and then Is_Tagged_Type
(Scope
(Subp
))
5556 and then not Has_Completion
(Scope
(Subp
))
5558 Form2
:= Next_Formal
(Form2
);
5561 if Present
(Form1
) then
5562 Form1
:= Next_Formal
(Form1
);
5563 Form2
:= Next_Formal
(Form2
);
5566 while Present
(Form1
) loop
5567 if not Is_Controlling_Formal
(Form1
)
5568 and then Present
(Next_Formal
(Form2
))
5569 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
5571 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
5572 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
5574 ("& does not match corresponding formal of&#",
5579 Next_Formal
(Form1
);
5580 Next_Formal
(Form2
);
5585 -- If there is an overridden subprogram, then check that there is no
5586 -- "not overriding" indicator, and mark the subprogram as overriding.
5587 -- This is not done if the overridden subprogram is marked as hidden,
5588 -- which can occur for the case of inherited controlled operations
5589 -- (see Derive_Subprogram), unless the inherited subprogram's parent
5590 -- subprogram is not itself hidden. (Note: This condition could probably
5591 -- be simplified, leaving out the testing for the specific controlled
5592 -- cases, but it seems safer and clearer this way, and echoes similar
5593 -- special-case tests of this kind in other places.)
5595 if Present
(Overridden_Subp
)
5596 and then (not Is_Hidden
(Overridden_Subp
)
5598 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
5601 and then Present
(Alias
(Overridden_Subp
))
5602 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
5604 if Must_Not_Override
(Spec
) then
5605 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
5607 if Ekind
(Subp
) = E_Entry
then
5609 ("entry & overrides inherited operation #", Spec
, Subp
);
5612 ("subprogram & overrides inherited operation #", Spec
, Subp
);
5615 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
5616 -- as an extension of Root_Controlled, and thus has a useless Adjust
5617 -- operation. This operation should not be inherited by other limited
5618 -- controlled types. An explicit Adjust for them is not overriding.
5620 elsif Must_Override
(Spec
)
5621 and then Chars
(Overridden_Subp
) = Name_Adjust
5622 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
5623 and then Present
(Alias
(Overridden_Subp
))
5625 Is_Predefined_File_Name
5626 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))))
5628 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5630 elsif Is_Subprogram
(Subp
) then
5631 if Is_Init_Proc
(Subp
) then
5634 elsif No
(Overridden_Operation
(Subp
)) then
5636 -- For entities generated by Derive_Subprograms the overridden
5637 -- operation is the inherited primitive (which is available
5638 -- through the attribute alias)
5640 if (Is_Dispatching_Operation
(Subp
)
5641 or else Is_Dispatching_Operation
(Overridden_Subp
))
5642 and then not Comes_From_Source
(Overridden_Subp
)
5643 and then Find_Dispatching_Type
(Overridden_Subp
) =
5644 Find_Dispatching_Type
(Subp
)
5645 and then Present
(Alias
(Overridden_Subp
))
5646 and then Comes_From_Source
(Alias
(Overridden_Subp
))
5648 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
5649 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
5652 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
5653 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
5658 -- If primitive flag is set or this is a protected operation, then
5659 -- the operation is overriding at the point of its declaration, so
5660 -- warn if necessary. Otherwise it may have been declared before the
5661 -- operation it overrides and no check is required.
5664 and then not Must_Override
(Spec
)
5665 and then (Is_Primitive
5666 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
5668 Style
.Missing_Overriding
(Decl
, Subp
);
5671 -- If Subp is an operator, it may override a predefined operation, if
5672 -- it is defined in the same scope as the type to which it applies.
5673 -- In that case Overridden_Subp is empty because of our implicit
5674 -- representation for predefined operators. We have to check whether the
5675 -- signature of Subp matches that of a predefined operator. Note that
5676 -- first argument provides the name of the operator, and the second
5677 -- argument the signature that may match that of a standard operation.
5678 -- If the indicator is overriding, then the operator must match a
5679 -- predefined signature, because we know already that there is no
5680 -- explicit overridden operation.
5682 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
5683 if Must_Not_Override
(Spec
) then
5685 -- If this is not a primitive or a protected subprogram, then
5686 -- "not overriding" is illegal.
5689 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5691 Error_Msg_N
("overriding indicator only allowed "
5692 & "if subprogram is primitive", Subp
);
5694 elsif Can_Override_Operator
(Subp
) then
5696 ("subprogram& overrides predefined operator ", Spec
, Subp
);
5699 elsif Must_Override
(Spec
) then
5700 if No
(Overridden_Operation
(Subp
))
5701 and then not Can_Override_Operator
(Subp
)
5703 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5706 elsif not Error_Posted
(Subp
)
5707 and then Style_Check
5708 and then Can_Override_Operator
(Subp
)
5710 not Is_Predefined_File_Name
5711 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
5713 -- If style checks are enabled, indicate that the indicator is
5714 -- missing. However, at the point of declaration, the type of
5715 -- which this is a primitive operation may be private, in which
5716 -- case the indicator would be premature.
5718 if Has_Private_Declaration
(Etype
(Subp
))
5719 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
5723 Style
.Missing_Overriding
(Decl
, Subp
);
5727 elsif Must_Override
(Spec
) then
5728 if Ekind
(Subp
) = E_Entry
then
5729 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
5731 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
5734 -- If the operation is marked "not overriding" and it's not primitive
5735 -- then an error is issued, unless this is an operation of a task or
5736 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
5737 -- has been specified have already been checked above.
5739 elsif Must_Not_Override
(Spec
)
5740 and then not Is_Primitive
5741 and then Ekind
(Subp
) /= E_Entry
5742 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
5745 ("overriding indicator only allowed if subprogram is primitive",
5749 end Check_Overriding_Indicator
;
5755 -- Note: this procedure needs to know far too much about how the expander
5756 -- messes with exceptions. The use of the flag Exception_Junk and the
5757 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
5758 -- works, but is not very clean. It would be better if the expansion
5759 -- routines would leave Original_Node working nicely, and we could use
5760 -- Original_Node here to ignore all the peculiar expander messing ???
5762 procedure Check_Returns
5766 Proc
: Entity_Id
:= Empty
)
5770 procedure Check_Statement_Sequence
(L
: List_Id
);
5771 -- Internal recursive procedure to check a list of statements for proper
5772 -- termination by a return statement (or a transfer of control or a
5773 -- compound statement that is itself internally properly terminated).
5775 ------------------------------
5776 -- Check_Statement_Sequence --
5777 ------------------------------
5779 procedure Check_Statement_Sequence
(L
: List_Id
) is
5784 function Assert_False
return Boolean;
5785 -- Returns True if Last_Stm is a pragma Assert (False) that has been
5786 -- rewritten as a null statement when assertions are off. The assert
5787 -- is not active, but it is still enough to kill the warning.
5793 function Assert_False
return Boolean is
5794 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
5797 if Nkind
(Orig
) = N_Pragma
5798 and then Pragma_Name
(Orig
) = Name_Assert
5799 and then not Error_Posted
(Orig
)
5802 Arg
: constant Node_Id
:=
5803 First
(Pragma_Argument_Associations
(Orig
));
5804 Exp
: constant Node_Id
:= Expression
(Arg
);
5806 return Nkind
(Exp
) = N_Identifier
5807 and then Chars
(Exp
) = Name_False
;
5817 Raise_Exception_Call
: Boolean;
5818 -- Set True if statement sequence terminated by Raise_Exception call
5819 -- or a Reraise_Occurrence call.
5821 -- Start of processing for Check_Statement_Sequence
5824 Raise_Exception_Call
:= False;
5826 -- Get last real statement
5828 Last_Stm
:= Last
(L
);
5830 -- Deal with digging out exception handler statement sequences that
5831 -- have been transformed by the local raise to goto optimization.
5832 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
5833 -- optimization has occurred, we are looking at something like:
5836 -- original stmts in block
5840 -- goto L1; | omitted if No_Exception_Propagation
5845 -- goto L3; -- skip handler when exception not raised
5847 -- <<L1>> -- target label for local exception
5861 -- and what we have to do is to dig out the estmts1 and estmts2
5862 -- sequences (which were the original sequences of statements in
5863 -- the exception handlers) and check them.
5865 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
5870 exit when Nkind
(Stm
) /= N_Block_Statement
;
5871 exit when not Exception_Junk
(Stm
);
5874 exit when Nkind
(Stm
) /= N_Label
;
5875 exit when not Exception_Junk
(Stm
);
5876 Check_Statement_Sequence
5877 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
5882 exit when Nkind
(Stm
) /= N_Goto_Statement
;
5883 exit when not Exception_Junk
(Stm
);
5887 -- Don't count pragmas
5889 while Nkind
(Last_Stm
) = N_Pragma
5891 -- Don't count call to SS_Release (can happen after Raise_Exception)
5894 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
5896 Nkind
(Name
(Last_Stm
)) = N_Identifier
5898 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
5900 -- Don't count exception junk
5903 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
5905 N_Object_Declaration
)
5906 and then Exception_Junk
(Last_Stm
))
5907 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
5908 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
5910 -- Inserted code, such as finalization calls, is irrelevant: we only
5911 -- need to check original source.
5913 or else Is_Rewrite_Insertion
(Last_Stm
)
5918 -- Here we have the "real" last statement
5920 Kind
:= Nkind
(Last_Stm
);
5922 -- Transfer of control, OK. Note that in the No_Return procedure
5923 -- case, we already diagnosed any explicit return statements, so
5924 -- we can treat them as OK in this context.
5926 if Is_Transfer
(Last_Stm
) then
5929 -- Check cases of explicit non-indirect procedure calls
5931 elsif Kind
= N_Procedure_Call_Statement
5932 and then Is_Entity_Name
(Name
(Last_Stm
))
5934 -- Check call to Raise_Exception procedure which is treated
5935 -- specially, as is a call to Reraise_Occurrence.
5937 -- We suppress the warning in these cases since it is likely that
5938 -- the programmer really does not expect to deal with the case
5939 -- of Null_Occurrence, and thus would find a warning about a
5940 -- missing return curious, and raising Program_Error does not
5941 -- seem such a bad behavior if this does occur.
5943 -- Note that in the Ada 2005 case for Raise_Exception, the actual
5944 -- behavior will be to raise Constraint_Error (see AI-329).
5946 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
5948 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
5950 Raise_Exception_Call
:= True;
5952 -- For Raise_Exception call, test first argument, if it is
5953 -- an attribute reference for a 'Identity call, then we know
5954 -- that the call cannot possibly return.
5957 Arg
: constant Node_Id
:=
5958 Original_Node
(First_Actual
(Last_Stm
));
5960 if Nkind
(Arg
) = N_Attribute_Reference
5961 and then Attribute_Name
(Arg
) = Name_Identity
5968 -- If statement, need to look inside if there is an else and check
5969 -- each constituent statement sequence for proper termination.
5971 elsif Kind
= N_If_Statement
5972 and then Present
(Else_Statements
(Last_Stm
))
5974 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
5975 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
5977 if Present
(Elsif_Parts
(Last_Stm
)) then
5979 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
5982 while Present
(Elsif_Part
) loop
5983 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
5991 -- Case statement, check each case for proper termination
5993 elsif Kind
= N_Case_Statement
then
5997 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
5998 while Present
(Case_Alt
) loop
5999 Check_Statement_Sequence
(Statements
(Case_Alt
));
6000 Next_Non_Pragma
(Case_Alt
);
6006 -- Block statement, check its handled sequence of statements
6008 elsif Kind
= N_Block_Statement
then
6014 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6023 -- Loop statement. If there is an iteration scheme, we can definitely
6024 -- fall out of the loop. Similarly if there is an exit statement, we
6025 -- can fall out. In either case we need a following return.
6027 elsif Kind
= N_Loop_Statement
then
6028 if Present
(Iteration_Scheme
(Last_Stm
))
6029 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6033 -- A loop with no exit statement or iteration scheme is either
6034 -- an infinite loop, or it has some other exit (raise/return).
6035 -- In either case, no warning is required.
6041 -- Timed entry call, check entry call and delay alternatives
6043 -- Note: in expanded code, the timed entry call has been converted
6044 -- to a set of expanded statements on which the check will work
6045 -- correctly in any case.
6047 elsif Kind
= N_Timed_Entry_Call
then
6049 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6050 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6053 -- If statement sequence of entry call alternative is missing,
6054 -- then we can definitely fall through, and we post the error
6055 -- message on the entry call alternative itself.
6057 if No
(Statements
(ECA
)) then
6060 -- If statement sequence of delay alternative is missing, then
6061 -- we can definitely fall through, and we post the error
6062 -- message on the delay alternative itself.
6064 -- Note: if both ECA and DCA are missing the return, then we
6065 -- post only one message, should be enough to fix the bugs.
6066 -- If not we will get a message next time on the DCA when the
6069 elsif No
(Statements
(DCA
)) then
6072 -- Else check both statement sequences
6075 Check_Statement_Sequence
(Statements
(ECA
));
6076 Check_Statement_Sequence
(Statements
(DCA
));
6081 -- Conditional entry call, check entry call and else part
6083 -- Note: in expanded code, the conditional entry call has been
6084 -- converted to a set of expanded statements on which the check
6085 -- will work correctly in any case.
6087 elsif Kind
= N_Conditional_Entry_Call
then
6089 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6092 -- If statement sequence of entry call alternative is missing,
6093 -- then we can definitely fall through, and we post the error
6094 -- message on the entry call alternative itself.
6096 if No
(Statements
(ECA
)) then
6099 -- Else check statement sequence and else part
6102 Check_Statement_Sequence
(Statements
(ECA
));
6103 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6109 -- If we fall through, issue appropriate message
6113 -- Kill warning if last statement is a raise exception call,
6114 -- or a pragma Assert (False). Note that with assertions enabled,
6115 -- such a pragma has been converted into a raise exception call
6116 -- already, so the Assert_False is for the assertions off case.
6118 if not Raise_Exception_Call
and then not Assert_False
then
6120 -- In GNATprove mode, it is an error to have a missing return
6122 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6124 -- Issue error message or warning
6127 ("RETURN statement missing following this statement<<!",
6130 ("\Program_Error ]<<!", Last_Stm
);
6133 -- Note: we set Err even though we have not issued a warning
6134 -- because we still have a case of a missing return. This is
6135 -- an extremely marginal case, probably will never be noticed
6136 -- but we might as well get it right.
6140 -- Otherwise we have the case of a procedure marked No_Return
6143 if not Raise_Exception_Call
then
6144 if GNATprove_Mode
then
6146 ("implied return after this statement "
6147 & "would have raised Program_Error", Last_Stm
);
6150 ("implied return after this statement "
6151 & "will raise Program_Error??", Last_Stm
);
6154 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6156 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6160 RE
: constant Node_Id
:=
6161 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6162 Reason
=> PE_Implicit_Return
);
6164 Insert_After
(Last_Stm
, RE
);
6168 end Check_Statement_Sequence
;
6170 -- Start of processing for Check_Returns
6174 Check_Statement_Sequence
(Statements
(HSS
));
6176 if Present
(Exception_Handlers
(HSS
)) then
6177 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6178 while Present
(Handler
) loop
6179 Check_Statement_Sequence
(Statements
(Handler
));
6180 Next_Non_Pragma
(Handler
);
6185 ----------------------------
6186 -- Check_Subprogram_Order --
6187 ----------------------------
6189 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6191 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6192 -- This is used to check if S1 > S2 in the sense required by this test,
6193 -- for example nameab < namec, but name2 < name10.
6195 -----------------------------
6196 -- Subprogram_Name_Greater --
6197 -----------------------------
6199 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6204 -- Deal with special case where names are identical except for a
6205 -- numerical suffix. These are handled specially, taking the numeric
6206 -- ordering from the suffix into account.
6209 while S1
(L1
) in '0' .. '9' loop
6214 while S2
(L2
) in '0' .. '9' loop
6218 -- If non-numeric parts non-equal, do straight compare
6220 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6223 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6224 -- that a missing suffix is treated as numeric zero in this test.
6228 while L1
< S1
'Last loop
6230 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6234 while L2
< S2
'Last loop
6236 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6241 end Subprogram_Name_Greater
;
6243 -- Start of processing for Check_Subprogram_Order
6246 -- Check body in alpha order if this is option
6249 and then Style_Check_Order_Subprograms
6250 and then Nkind
(N
) = N_Subprogram_Body
6251 and then Comes_From_Source
(N
)
6252 and then In_Extended_Main_Source_Unit
(N
)
6256 renames Scope_Stack
.Table
6257 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6259 Body_Id
: constant Entity_Id
:=
6260 Defining_Entity
(Specification
(N
));
6263 Get_Decoded_Name_String
(Chars
(Body_Id
));
6266 if Subprogram_Name_Greater
6267 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6269 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6275 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6278 end Check_Subprogram_Order;
6280 ------------------------------
6281 -- Check_Subtype_Conformant --
6282 ------------------------------
6284 procedure Check_Subtype_Conformant
6285 (New_Id : Entity_Id;
6287 Err_Loc : Node_Id := Empty;
6288 Skip_Controlling_Formals : Boolean := False;
6289 Get_Inst : Boolean := False)
6292 pragma Warnings (Off, Result);
6295 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6296 Skip_Controlling_Formals => Skip_Controlling_Formals,
6297 Get_Inst => Get_Inst);
6298 end Check_Subtype_Conformant;
6300 ---------------------------
6301 -- Check_Type_Conformant --
6302 ---------------------------
6304 procedure Check_Type_Conformant
6305 (New_Id : Entity_Id;
6307 Err_Loc : Node_Id := Empty)
6310 pragma Warnings (Off, Result);
6313 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
6314 end Check_Type_Conformant;
6316 ---------------------------
6317 -- Can_Override_Operator --
6318 ---------------------------
6320 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
6324 if Nkind (Subp) /= N_Defining_Operator_Symbol then
6328 Typ := Base_Type (Etype (First_Formal (Subp)));
6330 -- Check explicitly that the operation is a primitive of the type
6332 return Operator_Matches_Spec (Subp, Subp)
6333 and then not Is_Generic_Type (Typ)
6334 and then Scope (Subp) = Scope (Typ)
6335 and then not Is_Class_Wide_Type (Typ);
6337 end Can_Override_Operator;
6339 ----------------------
6340 -- Conforming_Types --
6341 ----------------------
6343 function Conforming_Types
6346 Ctype : Conformance_Type;
6347 Get_Inst : Boolean := False) return Boolean
6349 Type_1 : Entity_Id := T1;
6350 Type_2 : Entity_Id := T2;
6351 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
6353 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
6354 -- If neither T1 nor T2 are generic actual types, or if they are in
6355 -- different scopes (e.g. parent and child instances), then verify that
6356 -- the base types are equal. Otherwise T1 and T2 must be on the same
6357 -- subtype chain. The whole purpose of this procedure is to prevent
6358 -- spurious ambiguities in an instantiation that may arise if two
6359 -- distinct generic types are instantiated with the same actual.
6361 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
6362 -- An access parameter can designate an incomplete type. If the
6363 -- incomplete type is the limited view of a type from a limited_
6364 -- with_clause, check whether the non-limited view is available. If
6365 -- it is a (non-limited) incomplete type, get the full view.
6367 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
6368 -- Returns True if and only if either T1 denotes a limited view of T2
6369 -- or T2 denotes a limited view of T1. This can arise when the limited
6370 -- with view of a type is used in a subprogram declaration and the
6371 -- subprogram body is in the scope of a regular with clause for the
6372 -- same unit. In such a case, the two type entities can be considered
6373 -- identical for purposes of conformance checking.
6375 ----------------------
6376 -- Base_Types_Match --
6377 ----------------------
6379 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
6380 BT1 : constant Entity_Id := Base_Type (T1);
6381 BT2 : constant Entity_Id := Base_Type (T2);
6387 elsif BT1 = BT2 then
6389 -- The following is too permissive. A more precise test should
6390 -- check that the generic actual is an ancestor subtype of the
6393 -- See code in Find_Corresponding_Spec that applies an additional
6394 -- filter to handle accidental amiguities in instances.
6396 return not Is_Generic_Actual_Type (T1)
6397 or else not Is_Generic_Actual_Type (T2)
6398 or else Scope (T1) /= Scope (T2);
6400 -- If T2 is a generic actual type it is declared as the subtype of
6401 -- the actual. If that actual is itself a subtype we need to use its
6402 -- own base type to check for compatibility.
6404 elsif Ekind (BT2) = Ekind (T2) and then BT1 = Base_Type (BT2) then
6407 elsif Ekind (BT1) = Ekind (T1) and then BT2 = Base_Type (BT1) then
6413 end Base_Types_Match;
6415 --------------------------
6416 -- Find_Designated_Type --
6417 --------------------------
6419 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
6423 Desig := Directly_Designated_Type (T);
6425 if Ekind (Desig) = E_Incomplete_Type then
6427 -- If regular incomplete type, get full view if available
6429 if Present (Full_View (Desig)) then
6430 Desig := Full_View (Desig);
6432 -- If limited view of a type, get non-limited view if available,
6433 -- and check again for a regular incomplete type.
6435 elsif Present (Non_Limited_View (Desig)) then
6436 Desig := Get_Full_View (Non_Limited_View (Desig));
6441 end Find_Designated_Type;
6443 -------------------------------
6444 -- Matches_Limited_With_View --
6445 -------------------------------
6447 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
6449 -- In some cases a type imported through a limited_with clause, and
6450 -- its nonlimited view are both visible, for example in an anonymous
6451 -- access-to-class-wide type in a formal, or when building the body
6452 -- for a subprogram renaming after the subprogram has been frozen.
6453 -- In these cases Both entities designate the same type. In addition,
6454 -- if one of them is an actual in an instance, it may be a subtype of
6455 -- the non-limited view of the other.
6457 if From_Limited_With (T1)
6458 and then (T2 = Available_View (T1)
6459 or else Is_Subtype_Of (T2, Available_View (T1)))
6463 elsif From_Limited_With (T2)
6464 and then (T1 = Available_View (T2)
6465 or else Is_Subtype_Of (T1, Available_View (T2)))
6469 elsif From_Limited_With (T1)
6470 and then From_Limited_With (T2)
6471 and then Available_View (T1) = Available_View (T2)
6478 end Matches_Limited_With_View;
6480 -- Start of processing for Conforming_Types
6483 -- The context is an instance association for a formal access-to-
6484 -- subprogram type; the formal parameter types require mapping because
6485 -- they may denote other formal parameters of the generic unit.
6488 Type_1 := Get_Instance_Of (T1);
6489 Type_2 := Get_Instance_Of (T2);
6492 -- If one of the types is a view of the other introduced by a limited
6493 -- with clause, treat these as conforming for all purposes.
6495 if Matches_Limited_With_View (T1, T2) then
6498 elsif Base_Types_Match (Type_1, Type_2) then
6499 return Ctype <= Mode_Conformant
6500 or else Subtypes_Statically_Match (Type_1, Type_2);
6502 elsif Is_Incomplete_Or_Private_Type (Type_1)
6503 and then Present (Full_View (Type_1))
6504 and then Base_Types_Match (Full_View (Type_1), Type_2)
6506 return Ctype <= Mode_Conformant
6507 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
6509 elsif Ekind (Type_2) = E_Incomplete_Type
6510 and then Present (Full_View (Type_2))
6511 and then Base_Types_Match (Type_1, Full_View (Type_2))
6513 return Ctype <= Mode_Conformant
6514 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6516 elsif Is_Private_Type (Type_2)
6517 and then In_Instance
6518 and then Present (Full_View (Type_2))
6519 and then Base_Types_Match (Type_1, Full_View (Type_2))
6521 return Ctype <= Mode_Conformant
6522 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
6525 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
6526 -- treated recursively because they carry a signature. As far as
6527 -- conformance is concerned, convention plays no role, and either
6528 -- or both could be access to protected subprograms.
6530 Are_Anonymous_Access_To_Subprogram_Types :=
6531 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
6532 E_Anonymous_Access_Protected_Subprogram_Type)
6534 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
6535 E_Anonymous_Access_Protected_Subprogram_Type);
6537 -- Test anonymous access type case. For this case, static subtype
6538 -- matching is required for mode conformance (RM 6.3.1(15)). We check
6539 -- the base types because we may have built internal subtype entities
6540 -- to handle null-excluding types (see Process_Formals).
6542 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
6544 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
6546 -- Ada 2005 (AI-254)
6548 or else Are_Anonymous_Access_To_Subprogram_Types
6551 Desig_1 : Entity_Id;
6552 Desig_2 : Entity_Id;
6555 -- In Ada 2005, access constant indicators must match for
6556 -- subtype conformance.
6558 if Ada_Version >= Ada_2005
6559 and then Ctype >= Subtype_Conformant
6561 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
6566 Desig_1 := Find_Designated_Type (Type_1);
6567 Desig_2 := Find_Designated_Type (Type_2);
6569 -- If the context is an instance association for a formal
6570 -- access-to-subprogram type; formal access parameter designated
6571 -- types require mapping because they may denote other formal
6572 -- parameters of the generic unit.
6575 Desig_1 := Get_Instance_Of (Desig_1);
6576 Desig_2 := Get_Instance_Of (Desig_2);
6579 -- It is possible for a Class_Wide_Type to be introduced for an
6580 -- incomplete type, in which case there is a separate class_ wide
6581 -- type for the full view. The types conform if their Etypes
6582 -- conform, i.e. one may be the full view of the other. This can
6583 -- only happen in the context of an access parameter, other uses
6584 -- of an incomplete Class_Wide_Type are illegal.
6586 if Is_Class_Wide_Type (Desig_1)
6588 Is_Class_Wide_Type (Desig_2)
6592 (Etype (Base_Type (Desig_1)),
6593 Etype (Base_Type (Desig_2)), Ctype);
6595 elsif Are_Anonymous_Access_To_Subprogram_Types then
6596 if Ada_Version < Ada_2005 then
6597 return Ctype = Type_Conformant
6599 Subtypes_Statically_Match (Desig_1, Desig_2);
6601 -- We must check the conformance of the signatures themselves
6605 Conformant : Boolean;
6608 (Desig_1, Desig_2, Ctype, False, Conformant);
6614 return Base_Type (Desig_1) = Base_Type (Desig_2)
6615 and then (Ctype = Type_Conformant
6617 Subtypes_Statically_Match (Desig_1, Desig_2));
6621 -- Otherwise definitely no match
6624 if ((Ekind (Type_1) = E_Anonymous_Access_Type
6625 and then Is_Access_Type (Type_2))
6626 or else (Ekind (Type_2) = E_Anonymous_Access_Type
6627 and then Is_Access_Type (Type_1)))
6630 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
6632 May_Hide_Profile := True;
6637 end Conforming_Types;
6639 --------------------------
6640 -- Create_Extra_Formals --
6641 --------------------------
6643 procedure Create_Extra_Formals (E : Entity_Id) is
6645 First_Extra : Entity_Id := Empty;
6646 Last_Extra : Entity_Id;
6647 Formal_Type : Entity_Id;
6648 P_Formal : Entity_Id := Empty;
6650 function Add_Extra_Formal
6651 (Assoc_Entity : Entity_Id;
6654 Suffix : String) return Entity_Id;
6655 -- Add an extra formal to the current list of formals and extra formals.
6656 -- The extra formal is added to the end of the list of extra formals,
6657 -- and also returned as the result. These formals are always of mode IN.
6658 -- The new formal has the type Typ, is declared in Scope, and its name
6659 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
6660 -- The following suffixes are currently used. They should not be changed
6661 -- without coordinating with CodePeer, which makes use of these to
6662 -- provide better messages.
6664 -- O denotes the Constrained bit.
6665 -- L denotes the accessibility level.
6666 -- BIP_xxx denotes an extra formal for a build-in-place function. See
6667 -- the full list in exp_ch6.BIP_Formal_Kind.
6669 ----------------------
6670 -- Add_Extra_Formal --
6671 ----------------------
6673 function Add_Extra_Formal
6674 (Assoc_Entity : Entity_Id;
6677 Suffix : String) return Entity_Id
6679 EF : constant Entity_Id :=
6680 Make_Defining_Identifier (Sloc (Assoc_Entity),
6681 Chars => New_External_Name (Chars (Assoc_Entity),
6685 -- A little optimization. Never generate an extra formal for the
6686 -- _init operand of an initialization procedure, since it could
6689 if Chars (Formal) = Name_uInit then
6693 Set_Ekind (EF, E_In_Parameter);
6694 Set_Actual_Subtype (EF, Typ);
6695 Set_Etype (EF, Typ);
6696 Set_Scope (EF, Scope);
6697 Set_Mechanism (EF, Default_Mechanism);
6698 Set_Formal_Validity (EF);
6700 if No (First_Extra) then
6702 Set_Extra_Formals (Scope, First_Extra);
6705 if Present (Last_Extra) then
6706 Set_Extra_Formal (Last_Extra, EF);
6712 end Add_Extra_Formal;
6714 -- Start of processing for Create_Extra_Formals
6717 -- We never generate extra formals if expansion is not active because we
6718 -- don't need them unless we are generating code.
6720 if not Expander_Active then
6724 -- No need to generate extra formals in interface thunks whose target
6725 -- primitive has no extra formals.
6727 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
6731 -- If this is a derived subprogram then the subtypes of the parent
6732 -- subprogram's formal parameters will be used to determine the need
6733 -- for extra formals.
6735 if Is_Overloadable (E) and then Present (Alias (E)) then
6736 P_Formal := First_Formal (Alias (E));
6739 Last_Extra := Empty;
6740 Formal := First_Formal (E);
6741 while Present (Formal) loop
6742 Last_Extra := Formal;
6743 Next_Formal (Formal);
6746 -- If Extra_formals were already created, don't do it again. This
6747 -- situation may arise for subprogram types created as part of
6748 -- dispatching calls (see Expand_Dispatching_Call)
6750 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
6754 -- If the subprogram is a predefined dispatching subprogram then don't
6755 -- generate any extra constrained or accessibility level formals. In
6756 -- general we suppress these for internal subprograms (by not calling
6757 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
6758 -- generated stream attributes do get passed through because extra
6759 -- build-in-place formals are needed in some cases (limited 'Input
).
6761 if Is_Predefined_Internal_Operation
(E
) then
6762 goto Test_For_Func_Result_Extras
;
6765 Formal
:= First_Formal
(E
);
6766 while Present
(Formal
) loop
6768 -- Create extra formal for supporting the attribute 'Constrained.
6769 -- The case of a private type view without discriminants also
6770 -- requires the extra formal if the underlying type has defaulted
6773 if Ekind
(Formal
) /= E_In_Parameter
then
6774 if Present
(P_Formal
) then
6775 Formal_Type
:= Etype
(P_Formal
);
6777 Formal_Type
:= Etype
(Formal
);
6780 -- Do not produce extra formals for Unchecked_Union parameters.
6781 -- Jump directly to the end of the loop.
6783 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
6784 goto Skip_Extra_Formal_Generation
;
6787 if not Has_Discriminants
(Formal_Type
)
6788 and then Ekind
(Formal_Type
) in Private_Kind
6789 and then Present
(Underlying_Type
(Formal_Type
))
6791 Formal_Type
:= Underlying_Type
(Formal_Type
);
6794 -- Suppress the extra formal if formal's subtype is constrained or
6795 -- indefinite, or we're compiling for Ada 2012 and the underlying
6796 -- type is tagged and limited. In Ada 2012, a limited tagged type
6797 -- can have defaulted discriminants, but 'Constrained is required
6798 -- to return True, so the formal is never needed (see AI05-0214).
6799 -- Note that this ensures consistency of calling sequences for
6800 -- dispatching operations when some types in a class have defaults
6801 -- on discriminants and others do not (and requiring the extra
6802 -- formal would introduce distributed overhead).
6804 -- If the type does not have a completion yet, treat as prior to
6805 -- Ada 2012 for consistency.
6807 if Has_Discriminants
(Formal_Type
)
6808 and then not Is_Constrained
(Formal_Type
)
6809 and then not Is_Indefinite_Subtype
(Formal_Type
)
6810 and then (Ada_Version
< Ada_2012
6811 or else No
(Underlying_Type
(Formal_Type
))
6813 (Is_Limited_Type
(Formal_Type
)
6816 (Underlying_Type
(Formal_Type
)))))
6818 Set_Extra_Constrained
6819 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
6823 -- Create extra formal for supporting accessibility checking. This
6824 -- is done for both anonymous access formals and formals of named
6825 -- access types that are marked as controlling formals. The latter
6826 -- case can occur when Expand_Dispatching_Call creates a subprogram
6827 -- type and substitutes the types of access-to-class-wide actuals
6828 -- for the anonymous access-to-specific-type of controlling formals.
6829 -- Base_Type is applied because in cases where there is a null
6830 -- exclusion the formal may have an access subtype.
6832 -- This is suppressed if we specifically suppress accessibility
6833 -- checks at the package level for either the subprogram, or the
6834 -- package in which it resides. However, we do not suppress it
6835 -- simply if the scope has accessibility checks suppressed, since
6836 -- this could cause trouble when clients are compiled with a
6837 -- different suppression setting. The explicit checks at the
6838 -- package level are safe from this point of view.
6840 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
6841 or else (Is_Controlling_Formal
(Formal
)
6842 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
6844 (Explicit_Suppress
(E
, Accessibility_Check
)
6846 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
6849 or else Present
(Extra_Accessibility
(P_Formal
)))
6851 Set_Extra_Accessibility
6852 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
6855 -- This label is required when skipping extra formal generation for
6856 -- Unchecked_Union parameters.
6858 <<Skip_Extra_Formal_Generation
>>
6860 if Present
(P_Formal
) then
6861 Next_Formal
(P_Formal
);
6864 Next_Formal
(Formal
);
6867 <<Test_For_Func_Result_Extras
>>
6869 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
6870 -- function call is ... determined by the point of call ...".
6872 if Needs_Result_Accessibility_Level
(E
) then
6873 Set_Extra_Accessibility_Of_Result
6874 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
6877 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
6878 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
6880 if Ada_Version
>= Ada_2005
and then Is_Build_In_Place_Function
(E
) then
6882 Result_Subt
: constant Entity_Id
:= Etype
(E
);
6883 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
6884 Formal_Typ
: Entity_Id
;
6886 Discard
: Entity_Id
;
6887 pragma Warnings
(Off
, Discard
);
6890 -- In the case of functions with unconstrained result subtypes,
6891 -- add a 4-state formal indicating whether the return object is
6892 -- allocated by the caller (1), or should be allocated by the
6893 -- callee on the secondary stack (2), in the global heap (3), or
6894 -- in a user-defined storage pool (4). For the moment we just use
6895 -- Natural for the type of this formal. Note that this formal
6896 -- isn't usually needed in the case where the result subtype is
6897 -- constrained, but it is needed when the function has a tagged
6898 -- result, because generally such functions can be called in a
6899 -- dispatching context and such calls must be handled like calls
6900 -- to a class-wide function.
6902 if Needs_BIP_Alloc_Form
(E
) then
6905 (E
, Standard_Natural
,
6906 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
6908 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
6909 -- use a user-defined pool. This formal is not added on
6910 -- .NET/JVM/ZFP as those targets do not support pools.
6912 if VM_Target
= No_VM
6913 and then RTE_Available
(RE_Root_Storage_Pool_Ptr
)
6917 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
6918 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
6922 -- In the case of functions whose result type needs finalization,
6923 -- add an extra formal which represents the finalization master.
6925 if Needs_BIP_Finalization_Master
(E
) then
6928 (E
, RTE
(RE_Finalization_Master_Ptr
),
6929 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
6932 -- When the result type contains tasks, add two extra formals: the
6933 -- master of the tasks to be created, and the caller's activation
6936 if Has_Task
(Full_Subt
) then
6939 (E
, RTE
(RE_Master_Id
),
6940 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
6943 (E
, RTE
(RE_Activation_Chain_Access
),
6944 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
6947 -- All build-in-place functions get an extra formal that will be
6948 -- passed the address of the return object within the caller.
6951 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
6953 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
6954 Set_Etype
(Formal_Typ
, Formal_Typ
);
6955 Set_Depends_On_Private
6956 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
6957 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
6958 Set_Is_Access_Constant
(Formal_Typ
, False);
6960 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
6961 -- the designated type comes from the limited view (for back-end
6964 Set_From_Limited_With
6965 (Formal_Typ
, From_Limited_With
(Result_Subt
));
6967 Layout_Type
(Formal_Typ
);
6971 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
6974 end Create_Extra_Formals
;
6976 -----------------------------
6977 -- Enter_Overloaded_Entity --
6978 -----------------------------
6980 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
6981 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
6982 C_E
: Entity_Id
:= Current_Entity
(S
);
6986 Set_Has_Homonym
(E
);
6987 Set_Has_Homonym
(S
);
6990 Set_Is_Immediately_Visible
(S
);
6991 Set_Scope
(S
, Current_Scope
);
6993 -- Chain new entity if front of homonym in current scope, so that
6994 -- homonyms are contiguous.
6996 if Present
(E
) and then E
/= C_E
then
6997 while Homonym
(C_E
) /= E
loop
6998 C_E
:= Homonym
(C_E
);
7001 Set_Homonym
(C_E
, S
);
7005 Set_Current_Entity
(S
);
7010 if Is_Inherited_Operation
(S
) then
7011 Append_Inherited_Subprogram
(S
);
7013 Append_Entity
(S
, Current_Scope
);
7016 Set_Public_Status
(S
);
7018 if Debug_Flag_E
then
7019 Write_Str
("New overloaded entity chain: ");
7020 Write_Name
(Chars
(S
));
7023 while Present
(E
) loop
7024 Write_Str
(" "); Write_Int
(Int
(E
));
7031 -- Generate warning for hiding
7034 and then Comes_From_Source
(S
)
7035 and then In_Extended_Main_Source_Unit
(S
)
7042 -- Warn unless genuine overloading. Do not emit warning on
7043 -- hiding predefined operators in Standard (these are either an
7044 -- (artifact of our implicit declarations, or simple noise) but
7045 -- keep warning on a operator defined on a local subtype, because
7046 -- of the real danger that different operators may be applied in
7047 -- various parts of the program.
7049 -- Note that if E and S have the same scope, there is never any
7050 -- hiding. Either the two conflict, and the program is illegal,
7051 -- or S is overriding an implicit inherited subprogram.
7053 if Scope
(E
) /= Scope
(S
)
7054 and then (not Is_Overloadable
(E
)
7055 or else Subtype_Conformant
(E
, S
))
7056 and then (Is_Immediately_Visible
(E
)
7058 Is_Potentially_Use_Visible
(S
))
7060 if Scope
(E
) /= Standard_Standard
then
7061 Error_Msg_Sloc
:= Sloc
(E
);
7062 Error_Msg_N
("declaration of & hides one #?h?", S
);
7064 elsif Nkind
(S
) = N_Defining_Operator_Symbol
7066 Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /= Scope
(S
)
7069 ("declaration of & hides predefined operator?h?", S
);
7074 end Enter_Overloaded_Entity
;
7076 -----------------------------
7077 -- Check_Untagged_Equality --
7078 -----------------------------
7080 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
7081 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
7082 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
7086 -- This check applies only if we have a subprogram declaration with an
7087 -- untagged record type.
7089 if Nkind
(Decl
) /= N_Subprogram_Declaration
7090 or else not Is_Record_Type
(Typ
)
7091 or else Is_Tagged_Type
(Typ
)
7096 -- In Ada 2012 case, we will output errors or warnings depending on
7097 -- the setting of debug flag -gnatd.E.
7099 if Ada_Version
>= Ada_2012
then
7100 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
7102 -- In earlier versions of Ada, nothing to do unless we are warning on
7103 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
7106 if not Warn_On_Ada_2012_Compatibility
then
7111 -- Cases where the type has already been frozen
7113 if Is_Frozen
(Typ
) then
7115 -- If the type is not declared in a package, or if we are in the body
7116 -- of the package or in some other scope, the new operation is not
7117 -- primitive, and therefore legal, though suspicious. Should we
7118 -- generate a warning in this case ???
7120 if Ekind
(Scope
(Typ
)) /= E_Package
7121 or else Scope
(Typ
) /= Current_Scope
7125 -- If the type is a generic actual (sub)type, the operation is not
7126 -- primitive either because the base type is declared elsewhere.
7128 elsif Is_Generic_Actual_Type
(Typ
) then
7131 -- Here we have a definite error of declaration after freezing
7134 if Ada_Version
>= Ada_2012
then
7136 ("equality operator must be declared before type & is "
7137 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
7139 -- In Ada 2012 mode with error turned to warning, output one
7140 -- more warning to warn that the equality operation may not
7141 -- compose. This is the consequence of ignoring the error.
7143 if Error_Msg_Warn
then
7144 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
7149 ("equality operator must be declared before type& is "
7150 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
7153 -- If we are in the package body, we could just move the
7154 -- declaration to the package spec, so add a message saying that.
7156 if In_Package_Body
(Scope
(Typ
)) then
7157 if Ada_Version
>= Ada_2012
then
7159 ("\move declaration to package spec<<", Eq_Op
);
7162 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
7165 -- Otherwise try to find the freezing point
7168 Obj_Decl
:= Next
(Parent
(Typ
));
7169 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
7170 if Nkind
(Obj_Decl
) = N_Object_Declaration
7171 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
7173 -- Freezing point, output warnings
7175 if Ada_Version
>= Ada_2012
then
7177 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
7179 ("\an equality operator cannot be declared after "
7184 ("type& is frozen by declaration (Ada 2012)?y?",
7187 ("\an equality operator cannot be declared after "
7188 & "this point (Ada 2012)?y?",
7200 -- Here if type is not frozen yet. It is illegal to have a primitive
7201 -- equality declared in the private part if the type is visible.
7203 elsif not In_Same_List
(Parent
(Typ
), Decl
)
7204 and then not Is_Limited_Type
(Typ
)
7206 -- Shouldn't we give an RM reference here???
7208 if Ada_Version
>= Ada_2012
then
7210 ("equality operator appears too late<<", Eq_Op
);
7213 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
7216 -- No error detected
7221 end Check_Untagged_Equality
;
7223 -----------------------------
7224 -- Find_Corresponding_Spec --
7225 -----------------------------
7227 function Find_Corresponding_Spec
7229 Post_Error
: Boolean := True) return Entity_Id
7231 Spec
: constant Node_Id
:= Specification
(N
);
7232 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
7236 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
7237 -- Even if fully conformant, a body may depend on a generic actual when
7238 -- the spec does not, or vice versa, in which case they were distinct
7239 -- entities in the generic.
7241 -------------------------------
7242 -- Different_Generic_Profile --
7243 -------------------------------
7245 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
7248 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
7249 -- Check that the types of corresponding formals have the same
7250 -- generic actual if any. We have to account for subtypes of a
7251 -- generic formal, declared between a spec and a body, which may
7252 -- appear distinct in an instance but matched in the generic, and
7253 -- the subtype may be used either in the spec or the body of the
7254 -- subprogram being checked.
7256 -------------------------
7257 -- Same_Generic_Actual --
7258 -------------------------
7260 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
7262 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
7263 -- Predicate to check whether S1 is a subtype of S2 in the source
7266 -------------------------
7267 -- Is_Declared_Subtype --
7268 -------------------------
7270 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
7272 return Comes_From_Source
(Parent
(S1
))
7273 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
7274 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
7275 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
7276 end Is_Declared_Subtype
;
7278 -- Start of processing for Same_Generic_Actual
7281 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
7282 or else Is_Declared_Subtype
(T1
, T2
)
7283 or else Is_Declared_Subtype
(T2
, T1
);
7284 end Same_Generic_Actual
;
7286 -- Start of processing for Different_Generic_Profile
7289 if not In_Instance
then
7292 elsif Ekind
(E
) = E_Function
7293 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
7298 F1
:= First_Formal
(Designator
);
7299 F2
:= First_Formal
(E
);
7300 while Present
(F1
) loop
7301 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
7310 end Different_Generic_Profile
;
7312 -- Start of processing for Find_Corresponding_Spec
7315 E
:= Current_Entity
(Designator
);
7316 while Present
(E
) loop
7318 -- We are looking for a matching spec. It must have the same scope,
7319 -- and the same name, and either be type conformant, or be the case
7320 -- of a library procedure spec and its body (which belong to one
7321 -- another regardless of whether they are type conformant or not).
7323 if Scope
(E
) = Current_Scope
then
7324 if Current_Scope
= Standard_Standard
7325 or else (Ekind
(E
) = Ekind
(Designator
)
7326 and then Type_Conformant
(E
, Designator
))
7328 -- Within an instantiation, we know that spec and body are
7329 -- subtype conformant, because they were subtype conformant in
7330 -- the generic. We choose the subtype-conformant entity here as
7331 -- well, to resolve spurious ambiguities in the instance that
7332 -- were not present in the generic (i.e. when two different
7333 -- types are given the same actual). If we are looking for a
7334 -- spec to match a body, full conformance is expected.
7338 -- Inherit the convention and "ghostness" of the matching
7339 -- spec to ensure proper full and subtype conformance.
7341 Set_Convention
(Designator
, Convention
(E
));
7343 if Is_Ghost_Entity
(E
) then
7344 Set_Is_Ghost_Entity
(Designator
);
7347 -- Skip past subprogram bodies and subprogram renamings that
7348 -- may appear to have a matching spec, but that aren't fully
7349 -- conformant with it. That can occur in cases where an
7350 -- actual type causes unrelated homographs in the instance.
7352 if Nkind_In
(N
, N_Subprogram_Body
,
7353 N_Subprogram_Renaming_Declaration
)
7354 and then Present
(Homonym
(E
))
7355 and then not Fully_Conformant
(Designator
, E
)
7359 elsif not Subtype_Conformant
(Designator
, E
) then
7362 elsif Different_Generic_Profile
(E
) then
7367 -- Ada 2012 (AI05-0165): For internally generated bodies of
7368 -- null procedures locate the internally generated spec. We
7369 -- enforce mode conformance since a tagged type may inherit
7370 -- from interfaces several null primitives which differ only
7371 -- in the mode of the formals.
7373 if not (Comes_From_Source
(E
))
7374 and then Is_Null_Procedure
(E
)
7375 and then not Mode_Conformant
(Designator
, E
)
7379 -- For null procedures coming from source that are completions,
7380 -- analysis of the generated body will establish the link.
7382 elsif Comes_From_Source
(E
)
7383 and then Nkind
(Spec
) = N_Procedure_Specification
7384 and then Null_Present
(Spec
)
7388 elsif not Has_Completion
(E
) then
7389 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
7390 Set_Corresponding_Spec
(N
, E
);
7393 Set_Has_Completion
(E
);
7396 elsif Nkind
(Parent
(N
)) = N_Subunit
then
7398 -- If this is the proper body of a subunit, the completion
7399 -- flag is set when analyzing the stub.
7403 -- If E is an internal function with a controlling result that
7404 -- was created for an operation inherited by a null extension,
7405 -- it may be overridden by a body without a previous spec (one
7406 -- more reason why these should be shunned). In that case we
7407 -- remove the generated body if present, because the current
7408 -- one is the explicit overriding.
7410 elsif Ekind
(E
) = E_Function
7411 and then Ada_Version
>= Ada_2005
7412 and then not Comes_From_Source
(E
)
7413 and then Has_Controlling_Result
(E
)
7414 and then Is_Null_Extension
(Etype
(E
))
7415 and then Comes_From_Source
(Spec
)
7417 Set_Has_Completion
(E
, False);
7420 and then Nkind
(Parent
(E
)) = N_Function_Specification
7423 (Unit_Declaration_Node
7424 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
7428 -- If expansion is disabled, or if the wrapper function has
7429 -- not been generated yet, this a late body overriding an
7430 -- inherited operation, or it is an overriding by some other
7431 -- declaration before the controlling result is frozen. In
7432 -- either case this is a declaration of a new entity.
7438 -- If the body already exists, then this is an error unless
7439 -- the previous declaration is the implicit declaration of a
7440 -- derived subprogram. It is also legal for an instance to
7441 -- contain type conformant overloadable declarations (but the
7442 -- generic declaration may not), per 8.3(26/2).
7444 elsif No
(Alias
(E
))
7445 and then not Is_Intrinsic_Subprogram
(E
)
7446 and then not In_Instance
7449 Error_Msg_Sloc
:= Sloc
(E
);
7451 if Is_Imported
(E
) then
7453 ("body not allowed for imported subprogram & declared#",
7456 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
7460 -- Child units cannot be overloaded, so a conformance mismatch
7461 -- between body and a previous spec is an error.
7463 elsif Is_Child_Unit
(E
)
7465 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
7467 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
7472 ("body of child unit does not match previous declaration", N
);
7480 -- On exit, we know that no previous declaration of subprogram exists
7483 end Find_Corresponding_Spec
;
7485 ----------------------
7486 -- Fully_Conformant --
7487 ----------------------
7489 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
7492 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
7494 end Fully_Conformant
;
7496 ----------------------------------
7497 -- Fully_Conformant_Expressions --
7498 ----------------------------------
7500 function Fully_Conformant_Expressions
7501 (Given_E1
: Node_Id
;
7502 Given_E2
: Node_Id
) return Boolean
7504 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
7505 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
7506 -- We always test conformance on original nodes, since it is possible
7507 -- for analysis and/or expansion to make things look as though they
7508 -- conform when they do not, e.g. by converting 1+2 into 3.
7510 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
7511 renames Fully_Conformant_Expressions
;
7513 function FCL
(L1
, L2
: List_Id
) return Boolean;
7514 -- Compare elements of two lists for conformance. Elements have to be
7515 -- conformant, and actuals inserted as default parameters do not match
7516 -- explicit actuals with the same value.
7518 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
7519 -- Compare an operator node with a function call
7525 function FCL
(L1
, L2
: List_Id
) return Boolean is
7529 if L1
= No_List
then
7535 if L2
= No_List
then
7541 -- Compare two lists, skipping rewrite insertions (we want to compare
7542 -- the original trees, not the expanded versions).
7545 if Is_Rewrite_Insertion
(N1
) then
7547 elsif Is_Rewrite_Insertion
(N2
) then
7553 elsif not FCE
(N1
, N2
) then
7566 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
7567 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
7572 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
7577 Act
:= First
(Actuals
);
7579 if Nkind
(Op_Node
) in N_Binary_Op
then
7580 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
7587 return Present
(Act
)
7588 and then FCE
(Right_Opnd
(Op_Node
), Act
)
7589 and then No
(Next
(Act
));
7593 -- Start of processing for Fully_Conformant_Expressions
7596 -- Non-conformant if paren count does not match. Note: if some idiot
7597 -- complains that we don't do this right for more than 3 levels of
7598 -- parentheses, they will be treated with the respect they deserve.
7600 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
7603 -- If same entities are referenced, then they are conformant even if
7604 -- they have different forms (RM 8.3.1(19-20)).
7606 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
7607 if Present
(Entity
(E1
)) then
7608 return Entity
(E1
) = Entity
(E2
)
7609 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
7610 and then Ekind
(Entity
(E1
)) = E_Discriminant
7611 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
7613 elsif Nkind
(E1
) = N_Expanded_Name
7614 and then Nkind
(E2
) = N_Expanded_Name
7615 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7616 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7618 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
7621 -- Identifiers in component associations don't always have
7622 -- entities, but their names must conform.
7624 return Nkind
(E1
) = N_Identifier
7625 and then Nkind
(E2
) = N_Identifier
7626 and then Chars
(E1
) = Chars
(E2
);
7629 elsif Nkind
(E1
) = N_Character_Literal
7630 and then Nkind
(E2
) = N_Expanded_Name
7632 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
7633 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
7635 elsif Nkind
(E2
) = N_Character_Literal
7636 and then Nkind
(E1
) = N_Expanded_Name
7638 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
7639 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
7641 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
7642 return FCO
(E1
, E2
);
7644 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
7645 return FCO
(E2
, E1
);
7647 -- Otherwise we must have the same syntactic entity
7649 elsif Nkind
(E1
) /= Nkind
(E2
) then
7652 -- At this point, we specialize by node type
7659 FCL
(Expressions
(E1
), Expressions
(E2
))
7661 FCL
(Component_Associations
(E1
),
7662 Component_Associations
(E2
));
7665 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
7667 Nkind
(Expression
(E2
)) = N_Qualified_Expression
7669 return FCE
(Expression
(E1
), Expression
(E2
));
7671 -- Check that the subtype marks and any constraints
7676 Indic1
: constant Node_Id
:= Expression
(E1
);
7677 Indic2
: constant Node_Id
:= Expression
(E2
);
7682 if Nkind
(Indic1
) /= N_Subtype_Indication
then
7684 Nkind
(Indic2
) /= N_Subtype_Indication
7685 and then Entity
(Indic1
) = Entity
(Indic2
);
7687 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
7689 Nkind
(Indic1
) /= N_Subtype_Indication
7690 and then Entity
(Indic1
) = Entity
(Indic2
);
7693 if Entity
(Subtype_Mark
(Indic1
)) /=
7694 Entity
(Subtype_Mark
(Indic2
))
7699 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
7700 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
7701 while Present
(Elt1
) and then Present
(Elt2
) loop
7702 if not FCE
(Elt1
, Elt2
) then
7715 when N_Attribute_Reference
=>
7717 Attribute_Name
(E1
) = Attribute_Name
(E2
)
7718 and then FCL
(Expressions
(E1
), Expressions
(E2
));
7722 Entity
(E1
) = Entity
(E2
)
7723 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7724 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7726 when N_Short_Circuit | N_Membership_Test
=>
7728 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
7730 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7732 when N_Case_Expression
=>
7738 if not FCE
(Expression
(E1
), Expression
(E2
)) then
7742 Alt1
:= First
(Alternatives
(E1
));
7743 Alt2
:= First
(Alternatives
(E2
));
7745 if Present
(Alt1
) /= Present
(Alt2
) then
7747 elsif No
(Alt1
) then
7751 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
7752 or else not FCL
(Discrete_Choices
(Alt1
),
7753 Discrete_Choices
(Alt2
))
7764 when N_Character_Literal
=>
7766 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
7768 when N_Component_Association
=>
7770 FCL
(Choices
(E1
), Choices
(E2
))
7772 FCE
(Expression
(E1
), Expression
(E2
));
7774 when N_Explicit_Dereference
=>
7776 FCE
(Prefix
(E1
), Prefix
(E2
));
7778 when N_Extension_Aggregate
=>
7780 FCL
(Expressions
(E1
), Expressions
(E2
))
7781 and then Null_Record_Present
(E1
) =
7782 Null_Record_Present
(E2
)
7783 and then FCL
(Component_Associations
(E1
),
7784 Component_Associations
(E2
));
7786 when N_Function_Call
=>
7788 FCE
(Name
(E1
), Name
(E2
))
7790 FCL
(Parameter_Associations
(E1
),
7791 Parameter_Associations
(E2
));
7793 when N_If_Expression
=>
7795 FCL
(Expressions
(E1
), Expressions
(E2
));
7797 when N_Indexed_Component
=>
7799 FCE
(Prefix
(E1
), Prefix
(E2
))
7801 FCL
(Expressions
(E1
), Expressions
(E2
));
7803 when N_Integer_Literal
=>
7804 return (Intval
(E1
) = Intval
(E2
));
7809 when N_Operator_Symbol
=>
7811 Chars
(E1
) = Chars
(E2
);
7813 when N_Others_Choice
=>
7816 when N_Parameter_Association
=>
7818 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
7819 and then FCE
(Explicit_Actual_Parameter
(E1
),
7820 Explicit_Actual_Parameter
(E2
));
7822 when N_Qualified_Expression
=>
7824 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7826 FCE
(Expression
(E1
), Expression
(E2
));
7828 when N_Quantified_Expression
=>
7829 if not FCE
(Condition
(E1
), Condition
(E2
)) then
7833 if Present
(Loop_Parameter_Specification
(E1
))
7834 and then Present
(Loop_Parameter_Specification
(E2
))
7837 L1
: constant Node_Id
:=
7838 Loop_Parameter_Specification
(E1
);
7839 L2
: constant Node_Id
:=
7840 Loop_Parameter_Specification
(E2
);
7844 Reverse_Present
(L1
) = Reverse_Present
(L2
)
7846 FCE
(Defining_Identifier
(L1
),
7847 Defining_Identifier
(L2
))
7849 FCE
(Discrete_Subtype_Definition
(L1
),
7850 Discrete_Subtype_Definition
(L2
));
7853 elsif Present
(Iterator_Specification
(E1
))
7854 and then Present
(Iterator_Specification
(E2
))
7857 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
7858 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
7862 FCE
(Defining_Identifier
(I1
),
7863 Defining_Identifier
(I2
))
7865 Of_Present
(I1
) = Of_Present
(I2
)
7867 Reverse_Present
(I1
) = Reverse_Present
(I2
)
7868 and then FCE
(Name
(I1
), Name
(I2
))
7869 and then FCE
(Subtype_Indication
(I1
),
7870 Subtype_Indication
(I2
));
7873 -- The quantified expressions used different specifications to
7874 -- walk their respective ranges.
7882 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
7884 FCE
(High_Bound
(E1
), High_Bound
(E2
));
7886 when N_Real_Literal
=>
7887 return (Realval
(E1
) = Realval
(E2
));
7889 when N_Selected_Component
=>
7891 FCE
(Prefix
(E1
), Prefix
(E2
))
7893 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
7897 FCE
(Prefix
(E1
), Prefix
(E2
))
7899 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
7901 when N_String_Literal
=>
7903 S1
: constant String_Id
:= Strval
(E1
);
7904 S2
: constant String_Id
:= Strval
(E2
);
7905 L1
: constant Nat
:= String_Length
(S1
);
7906 L2
: constant Nat
:= String_Length
(S2
);
7913 for J
in 1 .. L1
loop
7914 if Get_String_Char
(S1
, J
) /=
7915 Get_String_Char
(S2
, J
)
7925 when N_Type_Conversion
=>
7927 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7929 FCE
(Expression
(E1
), Expression
(E2
));
7933 Entity
(E1
) = Entity
(E2
)
7935 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
7937 when N_Unchecked_Type_Conversion
=>
7939 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
7941 FCE
(Expression
(E1
), Expression
(E2
));
7943 -- All other node types cannot appear in this context. Strictly
7944 -- we should raise a fatal internal error. Instead we just ignore
7945 -- the nodes. This means that if anyone makes a mistake in the
7946 -- expander and mucks an expression tree irretrievably, the result
7947 -- will be a failure to detect a (probably very obscure) case
7948 -- of non-conformance, which is better than bombing on some
7949 -- case where two expressions do in fact conform.
7956 end Fully_Conformant_Expressions
;
7958 ----------------------------------------
7959 -- Fully_Conformant_Discrete_Subtypes --
7960 ----------------------------------------
7962 function Fully_Conformant_Discrete_Subtypes
7963 (Given_S1
: Node_Id
;
7964 Given_S2
: Node_Id
) return Boolean
7966 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
7967 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
7969 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
7970 -- Special-case for a bound given by a discriminant, which in the body
7971 -- is replaced with the discriminal of the enclosing type.
7973 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
7974 -- Check both bounds
7976 -----------------------
7977 -- Conforming_Bounds --
7978 -----------------------
7980 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
7982 if Is_Entity_Name
(B1
)
7983 and then Is_Entity_Name
(B2
)
7984 and then Ekind
(Entity
(B1
)) = E_Discriminant
7986 return Chars
(B1
) = Chars
(B2
);
7989 return Fully_Conformant_Expressions
(B1
, B2
);
7991 end Conforming_Bounds
;
7993 -----------------------
7994 -- Conforming_Ranges --
7995 -----------------------
7997 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
8000 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
8002 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
8003 end Conforming_Ranges
;
8005 -- Start of processing for Fully_Conformant_Discrete_Subtypes
8008 if Nkind
(S1
) /= Nkind
(S2
) then
8011 elsif Is_Entity_Name
(S1
) then
8012 return Entity
(S1
) = Entity
(S2
);
8014 elsif Nkind
(S1
) = N_Range
then
8015 return Conforming_Ranges
(S1
, S2
);
8017 elsif Nkind
(S1
) = N_Subtype_Indication
then
8019 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
8022 (Range_Expression
(Constraint
(S1
)),
8023 Range_Expression
(Constraint
(S2
)));
8027 end Fully_Conformant_Discrete_Subtypes
;
8029 --------------------
8030 -- Install_Entity --
8031 --------------------
8033 procedure Install_Entity
(E
: Entity_Id
) is
8034 Prev
: constant Entity_Id
:= Current_Entity
(E
);
8036 Set_Is_Immediately_Visible
(E
);
8037 Set_Current_Entity
(E
);
8038 Set_Homonym
(E
, Prev
);
8041 ---------------------
8042 -- Install_Formals --
8043 ---------------------
8045 procedure Install_Formals
(Id
: Entity_Id
) is
8048 F
:= First_Formal
(Id
);
8049 while Present
(F
) loop
8053 end Install_Formals
;
8055 -----------------------------
8056 -- Is_Interface_Conformant --
8057 -----------------------------
8059 function Is_Interface_Conformant
8060 (Tagged_Type
: Entity_Id
;
8061 Iface_Prim
: Entity_Id
;
8062 Prim
: Entity_Id
) return Boolean
8064 -- The operation may in fact be an inherited (implicit) operation
8065 -- rather than the original interface primitive, so retrieve the
8066 -- ultimate ancestor.
8068 Iface
: constant Entity_Id
:=
8069 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
8070 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
8072 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
8073 -- Return the controlling formal of Prim
8075 ------------------------
8076 -- Controlling_Formal --
8077 ------------------------
8079 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
8083 E
:= First_Entity
(Prim
);
8084 while Present
(E
) loop
8085 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
8093 end Controlling_Formal
;
8097 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
8098 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
8100 -- Start of processing for Is_Interface_Conformant
8103 pragma Assert
(Is_Subprogram
(Iface_Prim
)
8104 and then Is_Subprogram
(Prim
)
8105 and then Is_Dispatching_Operation
(Iface_Prim
)
8106 and then Is_Dispatching_Operation
(Prim
));
8108 pragma Assert
(Is_Interface
(Iface
)
8109 or else (Present
(Alias
(Iface_Prim
))
8112 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
8114 if Prim
= Iface_Prim
8115 or else not Is_Subprogram
(Prim
)
8116 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
8117 or else not Is_Dispatching_Operation
(Prim
)
8118 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
8120 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
8121 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
8125 -- The mode of the controlling formals must match
8127 elsif Present
(Iface_Ctrl_F
)
8128 and then Present
(Prim_Ctrl_F
)
8129 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
8133 -- Case of a procedure, or a function whose result type matches the
8134 -- result type of the interface primitive, or a function that has no
8135 -- controlling result (I or access I).
8137 elsif Ekind
(Iface_Prim
) = E_Procedure
8138 or else Etype
(Prim
) = Etype
(Iface_Prim
)
8139 or else not Has_Controlling_Result
(Prim
)
8141 return Type_Conformant
8142 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
8144 -- Case of a function returning an interface, or an access to one. Check
8145 -- that the return types correspond.
8147 elsif Implements_Interface
(Typ
, Iface
) then
8148 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
8150 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
8155 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
8156 Skip_Controlling_Formals
=> True);
8162 end Is_Interface_Conformant
;
8164 ---------------------------------
8165 -- Is_Non_Overriding_Operation --
8166 ---------------------------------
8168 function Is_Non_Overriding_Operation
8169 (Prev_E
: Entity_Id
;
8170 New_E
: Entity_Id
) return Boolean
8174 G_Typ
: Entity_Id
:= Empty
;
8176 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
8177 -- If F_Type is a derived type associated with a generic actual subtype,
8178 -- then return its Generic_Parent_Type attribute, else return Empty.
8180 function Types_Correspond
8181 (P_Type
: Entity_Id
;
8182 N_Type
: Entity_Id
) return Boolean;
8183 -- Returns true if and only if the types (or designated types in the
8184 -- case of anonymous access types) are the same or N_Type is derived
8185 -- directly or indirectly from P_Type.
8187 -----------------------------
8188 -- Get_Generic_Parent_Type --
8189 -----------------------------
8191 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
8197 if Is_Derived_Type
(F_Typ
)
8198 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
8200 -- The tree must be traversed to determine the parent subtype in
8201 -- the generic unit, which unfortunately isn't always available
8202 -- via semantic attributes. ??? (Note: The use of Original_Node
8203 -- is needed for cases where a full derived type has been
8206 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
8207 if Nkind
(Defn
) = N_Derived_Type_Definition
then
8208 Indic
:= Subtype_Indication
(Defn
);
8210 if Nkind
(Indic
) = N_Subtype_Indication
then
8211 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
8213 G_Typ
:= Entity
(Indic
);
8216 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
8217 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
8219 return Generic_Parent_Type
(Parent
(G_Typ
));
8225 end Get_Generic_Parent_Type
;
8227 ----------------------
8228 -- Types_Correspond --
8229 ----------------------
8231 function Types_Correspond
8232 (P_Type
: Entity_Id
;
8233 N_Type
: Entity_Id
) return Boolean
8235 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
8236 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
8239 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
8240 Prev_Type
:= Designated_Type
(Prev_Type
);
8243 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
8244 New_Type
:= Designated_Type
(New_Type
);
8247 if Prev_Type
= New_Type
then
8250 elsif not Is_Class_Wide_Type
(New_Type
) then
8251 while Etype
(New_Type
) /= New_Type
loop
8252 New_Type
:= Etype
(New_Type
);
8253 if New_Type
= Prev_Type
then
8259 end Types_Correspond
;
8261 -- Start of processing for Is_Non_Overriding_Operation
8264 -- In the case where both operations are implicit derived subprograms
8265 -- then neither overrides the other. This can only occur in certain
8266 -- obscure cases (e.g., derivation from homographs created in a generic
8269 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
8272 elsif Ekind
(Current_Scope
) = E_Package
8273 and then Is_Generic_Instance
(Current_Scope
)
8274 and then In_Private_Part
(Current_Scope
)
8275 and then Comes_From_Source
(New_E
)
8277 -- We examine the formals and result type of the inherited operation,
8278 -- to determine whether their type is derived from (the instance of)
8279 -- a generic type. The first such formal or result type is the one
8282 Formal
:= First_Formal
(Prev_E
);
8283 while Present
(Formal
) loop
8284 F_Typ
:= Base_Type
(Etype
(Formal
));
8286 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
8287 F_Typ
:= Designated_Type
(F_Typ
);
8290 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
8291 exit when Present
(G_Typ
);
8293 Next_Formal
(Formal
);
8296 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
8297 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
8304 -- If the generic type is a private type, then the original operation
8305 -- was not overriding in the generic, because there was no primitive
8306 -- operation to override.
8308 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
8309 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
8310 N_Formal_Private_Type_Definition
8314 -- The generic parent type is the ancestor of a formal derived
8315 -- type declaration. We need to check whether it has a primitive
8316 -- operation that should be overridden by New_E in the generic.
8320 P_Formal
: Entity_Id
;
8321 N_Formal
: Entity_Id
;
8325 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
8328 while Present
(Prim_Elt
) loop
8329 P_Prim
:= Node
(Prim_Elt
);
8331 if Chars
(P_Prim
) = Chars
(New_E
)
8332 and then Ekind
(P_Prim
) = Ekind
(New_E
)
8334 P_Formal
:= First_Formal
(P_Prim
);
8335 N_Formal
:= First_Formal
(New_E
);
8336 while Present
(P_Formal
) and then Present
(N_Formal
) loop
8337 P_Typ
:= Etype
(P_Formal
);
8338 N_Typ
:= Etype
(N_Formal
);
8340 if not Types_Correspond
(P_Typ
, N_Typ
) then
8344 Next_Entity
(P_Formal
);
8345 Next_Entity
(N_Formal
);
8348 -- Found a matching primitive operation belonging to the
8349 -- formal ancestor type, so the new subprogram is
8353 and then No
(N_Formal
)
8354 and then (Ekind
(New_E
) /= E_Function
8357 (Etype
(P_Prim
), Etype
(New_E
)))
8363 Next_Elmt
(Prim_Elt
);
8366 -- If no match found, then the new subprogram does not override
8367 -- in the generic (nor in the instance).
8369 -- If the type in question is not abstract, and the subprogram
8370 -- is, this will be an error if the new operation is in the
8371 -- private part of the instance. Emit a warning now, which will
8372 -- make the subsequent error message easier to understand.
8374 if not Is_Abstract_Type
(F_Typ
)
8375 and then Is_Abstract_Subprogram
(Prev_E
)
8376 and then In_Private_Part
(Current_Scope
)
8378 Error_Msg_Node_2
:= F_Typ
;
8380 ("private operation& in generic unit does not override "
8381 & "any primitive operation of& (RM 12.3 (18))??",
8391 end Is_Non_Overriding_Operation
;
8393 -------------------------------------
8394 -- List_Inherited_Pre_Post_Aspects --
8395 -------------------------------------
8397 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
8399 if Opt
.List_Inherited_Aspects
8400 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
8403 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
8408 for Index
in Subps
'Range loop
8409 Items
:= Contract
(Subps
(Index
));
8411 if Present
(Items
) then
8412 Prag
:= Pre_Post_Conditions
(Items
);
8413 while Present
(Prag
) loop
8414 Error_Msg_Sloc
:= Sloc
(Prag
);
8416 if Class_Present
(Prag
)
8417 and then not Split_PPC
(Prag
)
8419 if Pragma_Name
(Prag
) = Name_Precondition
then
8421 ("info: & inherits `Pre''Class` aspect from "
8425 ("info: & inherits `Post''Class` aspect from "
8430 Prag
:= Next_Pragma
(Prag
);
8436 end List_Inherited_Pre_Post_Aspects
;
8438 ------------------------------
8439 -- Make_Inequality_Operator --
8440 ------------------------------
8442 -- S is the defining identifier of an equality operator. We build a
8443 -- subprogram declaration with the right signature. This operation is
8444 -- intrinsic, because it is always expanded as the negation of the
8445 -- call to the equality function.
8447 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
8448 Loc
: constant Source_Ptr
:= Sloc
(S
);
8451 Op_Name
: Entity_Id
;
8453 FF
: constant Entity_Id
:= First_Formal
(S
);
8454 NF
: constant Entity_Id
:= Next_Formal
(FF
);
8457 -- Check that equality was properly defined, ignore call if not
8464 A
: constant Entity_Id
:=
8465 Make_Defining_Identifier
(Sloc
(FF
),
8466 Chars
=> Chars
(FF
));
8468 B
: constant Entity_Id
:=
8469 Make_Defining_Identifier
(Sloc
(NF
),
8470 Chars
=> Chars
(NF
));
8473 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
8475 Formals
:= New_List
(
8476 Make_Parameter_Specification
(Loc
,
8477 Defining_Identifier
=> A
,
8479 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
8480 Sloc
(Etype
(First_Formal
(S
))))),
8482 Make_Parameter_Specification
(Loc
,
8483 Defining_Identifier
=> B
,
8485 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
8486 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
8489 Make_Subprogram_Declaration
(Loc
,
8491 Make_Function_Specification
(Loc
,
8492 Defining_Unit_Name
=> Op_Name
,
8493 Parameter_Specifications
=> Formals
,
8494 Result_Definition
=>
8495 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
8497 -- Insert inequality right after equality if it is explicit or after
8498 -- the derived type when implicit. These entities are created only
8499 -- for visibility purposes, and eventually replaced in the course
8500 -- of expansion, so they do not need to be attached to the tree and
8501 -- seen by the back-end. Keeping them internal also avoids spurious
8502 -- freezing problems. The declaration is inserted in the tree for
8503 -- analysis, and removed afterwards. If the equality operator comes
8504 -- from an explicit declaration, attach the inequality immediately
8505 -- after. Else the equality is inherited from a derived type
8506 -- declaration, so insert inequality after that declaration.
8508 if No
(Alias
(S
)) then
8509 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
8510 elsif Is_List_Member
(Parent
(S
)) then
8511 Insert_After
(Parent
(S
), Decl
);
8513 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
8516 Mark_Rewrite_Insertion
(Decl
);
8517 Set_Is_Intrinsic_Subprogram
(Op_Name
);
8520 Set_Has_Completion
(Op_Name
);
8521 Set_Corresponding_Equality
(Op_Name
, S
);
8522 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
8524 end Make_Inequality_Operator
;
8526 ----------------------
8527 -- May_Need_Actuals --
8528 ----------------------
8530 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
8535 F
:= First_Formal
(Fun
);
8537 while Present
(F
) loop
8538 if No
(Default_Value
(F
)) then
8546 Set_Needs_No_Actuals
(Fun
, B
);
8547 end May_Need_Actuals
;
8549 ---------------------
8550 -- Mode_Conformant --
8551 ---------------------
8553 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8556 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
8558 end Mode_Conformant
;
8560 ---------------------------
8561 -- New_Overloaded_Entity --
8562 ---------------------------
8564 procedure New_Overloaded_Entity
8566 Derived_Type
: Entity_Id
:= Empty
)
8568 Overridden_Subp
: Entity_Id
:= Empty
;
8569 -- Set if the current scope has an operation that is type-conformant
8570 -- with S, and becomes hidden by S.
8572 Is_Primitive_Subp
: Boolean;
8573 -- Set to True if the new subprogram is primitive
8576 -- Entity that S overrides
8578 Prev_Vis
: Entity_Id
:= Empty
;
8579 -- Predecessor of E in Homonym chain
8581 procedure Check_For_Primitive_Subprogram
8582 (Is_Primitive
: out Boolean;
8583 Is_Overriding
: Boolean := False);
8584 -- If the subprogram being analyzed is a primitive operation of the type
8585 -- of a formal or result, set the Has_Primitive_Operations flag on the
8586 -- type, and set Is_Primitive to True (otherwise set to False). Set the
8587 -- corresponding flag on the entity itself for later use.
8589 procedure Check_Synchronized_Overriding
8590 (Def_Id
: Entity_Id
;
8591 Overridden_Subp
: out Entity_Id
);
8592 -- First determine if Def_Id is an entry or a subprogram either defined
8593 -- in the scope of a task or protected type, or is a primitive of such
8594 -- a type. Check whether Def_Id overrides a subprogram of an interface
8595 -- implemented by the synchronized type, return the overridden entity
8598 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
8599 -- Check that E is declared in the private part of the current package,
8600 -- or in the package body, where it may hide a previous declaration.
8601 -- We can't use In_Private_Part by itself because this flag is also
8602 -- set when freezing entities, so we must examine the place of the
8603 -- declaration in the tree, and recognize wrapper packages as well.
8605 function Is_Overriding_Alias
8607 New_E
: Entity_Id
) return Boolean;
8608 -- Check whether new subprogram and old subprogram are both inherited
8609 -- from subprograms that have distinct dispatch table entries. This can
8610 -- occur with derivations from instances with accidental homonyms. The
8611 -- function is conservative given that the converse is only true within
8612 -- instances that contain accidental overloadings.
8614 ------------------------------------
8615 -- Check_For_Primitive_Subprogram --
8616 ------------------------------------
8618 procedure Check_For_Primitive_Subprogram
8619 (Is_Primitive
: out Boolean;
8620 Is_Overriding
: Boolean := False)
8626 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
8627 -- Returns true if T is declared in the visible part of the current
8628 -- package scope; otherwise returns false. Assumes that T is declared
8631 procedure Check_Private_Overriding
(T
: Entity_Id
);
8632 -- Checks that if a primitive abstract subprogram of a visible
8633 -- abstract type is declared in a private part, then it must override
8634 -- an abstract subprogram declared in the visible part. Also checks
8635 -- that if a primitive function with a controlling result is declared
8636 -- in a private part, then it must override a function declared in
8637 -- the visible part.
8639 ------------------------------
8640 -- Check_Private_Overriding --
8641 ------------------------------
8643 procedure Check_Private_Overriding
(T
: Entity_Id
) is
8645 function Overrides_Visible_Function
8646 (Partial_View
: Entity_Id
) return Boolean;
8647 -- True if S overrides a function in the visible part. The
8648 -- overridden function could be explicitly or implicitly declared.
8650 function Overrides_Visible_Function
8651 (Partial_View
: Entity_Id
) return Boolean
8654 if not Is_Overriding
or else not Has_Homonym
(S
) then
8658 if not Present
(Partial_View
) then
8662 -- Search through all the homonyms H of S in the current
8663 -- package spec, and return True if we find one that matches.
8664 -- Note that Parent (H) will be the declaration of the
8665 -- partial view of T for a match.
8672 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
8676 N_Private_Extension_Declaration
,
8677 N_Private_Type_Declaration
)
8678 and then Defining_Identifier
(Parent
(H
)) = Partial_View
8686 end Overrides_Visible_Function
;
8688 -- Start of processing for Check_Private_Overriding
8691 if Is_Package_Or_Generic_Package
(Current_Scope
)
8692 and then In_Private_Part
(Current_Scope
)
8693 and then Visible_Part_Type
(T
)
8694 and then not In_Instance
8696 if Is_Abstract_Type
(T
)
8697 and then Is_Abstract_Subprogram
(S
)
8698 and then (not Is_Overriding
8699 or else not Is_Abstract_Subprogram
(E
))
8701 Error_Msg_N
("abstract subprograms must be visible "
8702 & "(RM 3.9.3(10))!", S
);
8704 elsif Ekind
(S
) = E_Function
then
8706 Partial_View
: constant Entity_Id
:=
8707 Incomplete_Or_Partial_View
(T
);
8710 if not Overrides_Visible_Function
(Partial_View
) then
8712 -- Here, S is "function ... return T;" declared in
8713 -- the private part, not overriding some visible
8714 -- operation. That's illegal in the tagged case
8715 -- (but not if the private type is untagged).
8717 if ((Present
(Partial_View
)
8718 and then Is_Tagged_Type
(Partial_View
))
8719 or else (not Present
(Partial_View
)
8720 and then Is_Tagged_Type
(T
)))
8721 and then T
= Base_Type
(Etype
(S
))
8724 ("private function with tagged result must"
8725 & " override visible-part function", S
);
8727 ("\move subprogram to the visible part"
8728 & " (RM 3.9.3(10))", S
);
8730 -- AI05-0073: extend this test to the case of a
8731 -- function with a controlling access result.
8733 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
8734 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
8736 not Is_Class_Wide_Type
8737 (Designated_Type
(Etype
(S
)))
8738 and then Ada_Version
>= Ada_2012
8741 ("private function with controlling access "
8742 & "result must override visible-part function",
8745 ("\move subprogram to the visible part"
8746 & " (RM 3.9.3(10))", S
);
8752 end Check_Private_Overriding
;
8754 -----------------------
8755 -- Visible_Part_Type --
8756 -----------------------
8758 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
8759 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
8763 -- If the entity is a private type, then it must be declared in a
8766 if Ekind
(T
) in Private_Kind
then
8770 -- Otherwise, we traverse the visible part looking for its
8771 -- corresponding declaration. We cannot use the declaration
8772 -- node directly because in the private part the entity of a
8773 -- private type is the one in the full view, which does not
8774 -- indicate that it is the completion of something visible.
8776 N
:= First
(Visible_Declarations
(Specification
(P
)));
8777 while Present
(N
) loop
8778 if Nkind
(N
) = N_Full_Type_Declaration
8779 and then Present
(Defining_Identifier
(N
))
8780 and then T
= Defining_Identifier
(N
)
8784 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
8785 N_Private_Extension_Declaration
)
8786 and then Present
(Defining_Identifier
(N
))
8787 and then T
= Full_View
(Defining_Identifier
(N
))
8796 end Visible_Part_Type
;
8798 -- Start of processing for Check_For_Primitive_Subprogram
8801 Is_Primitive
:= False;
8803 if not Comes_From_Source
(S
) then
8806 -- If subprogram is at library level, it is not primitive operation
8808 elsif Current_Scope
= Standard_Standard
then
8811 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
8812 and then not In_Package_Body
(Current_Scope
))
8813 or else Is_Overriding
8815 -- For function, check return type
8817 if Ekind
(S
) = E_Function
then
8818 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
8819 F_Typ
:= Designated_Type
(Etype
(S
));
8824 B_Typ
:= Base_Type
(F_Typ
);
8826 if Scope
(B_Typ
) = Current_Scope
8827 and then not Is_Class_Wide_Type
(B_Typ
)
8828 and then not Is_Generic_Type
(B_Typ
)
8830 Is_Primitive
:= True;
8831 Set_Has_Primitive_Operations
(B_Typ
);
8832 Set_Is_Primitive
(S
);
8833 Check_Private_Overriding
(B_Typ
);
8837 -- For all subprograms, check formals
8839 Formal
:= First_Formal
(S
);
8840 while Present
(Formal
) loop
8841 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
8842 F_Typ
:= Designated_Type
(Etype
(Formal
));
8844 F_Typ
:= Etype
(Formal
);
8847 B_Typ
:= Base_Type
(F_Typ
);
8849 if Ekind
(B_Typ
) = E_Access_Subtype
then
8850 B_Typ
:= Base_Type
(B_Typ
);
8853 if Scope
(B_Typ
) = Current_Scope
8854 and then not Is_Class_Wide_Type
(B_Typ
)
8855 and then not Is_Generic_Type
(B_Typ
)
8857 Is_Primitive
:= True;
8858 Set_Is_Primitive
(S
);
8859 Set_Has_Primitive_Operations
(B_Typ
);
8860 Check_Private_Overriding
(B_Typ
);
8863 Next_Formal
(Formal
);
8866 -- Special case: An equality function can be redefined for a type
8867 -- occurring in a declarative part, and won't otherwise be treated as
8868 -- a primitive because it doesn't occur in a package spec and doesn't
8869 -- override an inherited subprogram. It's important that we mark it
8870 -- primitive so it can be returned by Collect_Primitive_Operations
8871 -- and be used in composing the equality operation of later types
8872 -- that have a component of the type.
8874 elsif Chars
(S
) = Name_Op_Eq
8875 and then Etype
(S
) = Standard_Boolean
8877 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
8879 if Scope
(B_Typ
) = Current_Scope
8881 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
8882 and then not Is_Limited_Type
(B_Typ
)
8884 Is_Primitive
:= True;
8885 Set_Is_Primitive
(S
);
8886 Set_Has_Primitive_Operations
(B_Typ
);
8887 Check_Private_Overriding
(B_Typ
);
8890 end Check_For_Primitive_Subprogram
;
8892 -----------------------------------
8893 -- Check_Synchronized_Overriding --
8894 -----------------------------------
8896 procedure Check_Synchronized_Overriding
8897 (Def_Id
: Entity_Id
;
8898 Overridden_Subp
: out Entity_Id
)
8900 Ifaces_List
: Elist_Id
;
8904 function Matches_Prefixed_View_Profile
8905 (Prim_Params
: List_Id
;
8906 Iface_Params
: List_Id
) return Boolean;
8907 -- Determine whether a subprogram's parameter profile Prim_Params
8908 -- matches that of a potentially overridden interface subprogram
8909 -- Iface_Params. Also determine if the type of first parameter of
8910 -- Iface_Params is an implemented interface.
8912 -----------------------------------
8913 -- Matches_Prefixed_View_Profile --
8914 -----------------------------------
8916 function Matches_Prefixed_View_Profile
8917 (Prim_Params
: List_Id
;
8918 Iface_Params
: List_Id
) return Boolean
8920 Iface_Id
: Entity_Id
;
8921 Iface_Param
: Node_Id
;
8922 Iface_Typ
: Entity_Id
;
8923 Prim_Id
: Entity_Id
;
8924 Prim_Param
: Node_Id
;
8925 Prim_Typ
: Entity_Id
;
8927 function Is_Implemented
8928 (Ifaces_List
: Elist_Id
;
8929 Iface
: Entity_Id
) return Boolean;
8930 -- Determine if Iface is implemented by the current task or
8933 --------------------
8934 -- Is_Implemented --
8935 --------------------
8937 function Is_Implemented
8938 (Ifaces_List
: Elist_Id
;
8939 Iface
: Entity_Id
) return Boolean
8941 Iface_Elmt
: Elmt_Id
;
8944 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
8945 while Present
(Iface_Elmt
) loop
8946 if Node
(Iface_Elmt
) = Iface
then
8950 Next_Elmt
(Iface_Elmt
);
8956 -- Start of processing for Matches_Prefixed_View_Profile
8959 Iface_Param
:= First
(Iface_Params
);
8960 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
8962 if Is_Access_Type
(Iface_Typ
) then
8963 Iface_Typ
:= Designated_Type
(Iface_Typ
);
8966 Prim_Param
:= First
(Prim_Params
);
8968 -- The first parameter of the potentially overridden subprogram
8969 -- must be an interface implemented by Prim.
8971 if not Is_Interface
(Iface_Typ
)
8972 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
8977 -- The checks on the object parameters are done, move onto the
8978 -- rest of the parameters.
8980 if not In_Scope
then
8981 Prim_Param
:= Next
(Prim_Param
);
8984 Iface_Param
:= Next
(Iface_Param
);
8985 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
8986 Iface_Id
:= Defining_Identifier
(Iface_Param
);
8987 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
8989 Prim_Id
:= Defining_Identifier
(Prim_Param
);
8990 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
8992 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
8993 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
8994 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
8996 Iface_Typ
:= Designated_Type
(Iface_Typ
);
8997 Prim_Typ
:= Designated_Type
(Prim_Typ
);
9000 -- Case of multiple interface types inside a parameter profile
9002 -- (Obj_Param : in out Iface; ...; Param : Iface)
9004 -- If the interface type is implemented, then the matching type
9005 -- in the primitive should be the implementing record type.
9007 if Ekind
(Iface_Typ
) = E_Record_Type
9008 and then Is_Interface
(Iface_Typ
)
9009 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
9011 if Prim_Typ
/= Typ
then
9015 -- The two parameters must be both mode and subtype conformant
9017 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
9019 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
9028 -- One of the two lists contains more parameters than the other
9030 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
9035 end Matches_Prefixed_View_Profile
;
9037 -- Start of processing for Check_Synchronized_Overriding
9040 Overridden_Subp
:= Empty
;
9042 -- Def_Id must be an entry or a subprogram. We should skip predefined
9043 -- primitives internally generated by the frontend; however at this
9044 -- stage predefined primitives are still not fully decorated. As a
9045 -- minor optimization we skip here internally generated subprograms.
9047 if (Ekind
(Def_Id
) /= E_Entry
9048 and then Ekind
(Def_Id
) /= E_Function
9049 and then Ekind
(Def_Id
) /= E_Procedure
)
9050 or else not Comes_From_Source
(Def_Id
)
9055 -- Search for the concurrent declaration since it contains the list
9056 -- of all implemented interfaces. In this case, the subprogram is
9057 -- declared within the scope of a protected or a task type.
9059 if Present
(Scope
(Def_Id
))
9060 and then Is_Concurrent_Type
(Scope
(Def_Id
))
9061 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
9063 Typ
:= Scope
(Def_Id
);
9066 -- The enclosing scope is not a synchronized type and the subprogram
9069 elsif No
(First_Formal
(Def_Id
)) then
9072 -- The subprogram has formals and hence it may be a primitive of a
9076 Typ
:= Etype
(First_Formal
(Def_Id
));
9078 if Is_Access_Type
(Typ
) then
9079 Typ
:= Directly_Designated_Type
(Typ
);
9082 if Is_Concurrent_Type
(Typ
)
9083 and then not Is_Generic_Actual_Type
(Typ
)
9087 -- This case occurs when the concurrent type is declared within
9088 -- a generic unit. As a result the corresponding record has been
9089 -- built and used as the type of the first formal, we just have
9090 -- to retrieve the corresponding concurrent type.
9092 elsif Is_Concurrent_Record_Type
(Typ
)
9093 and then not Is_Class_Wide_Type
(Typ
)
9094 and then Present
(Corresponding_Concurrent_Type
(Typ
))
9096 Typ
:= Corresponding_Concurrent_Type
(Typ
);
9104 -- There is no overriding to check if is an inherited operation in a
9105 -- type derivation on for a generic actual.
9107 Collect_Interfaces
(Typ
, Ifaces_List
);
9109 if Is_Empty_Elmt_List
(Ifaces_List
) then
9113 -- Determine whether entry or subprogram Def_Id overrides a primitive
9114 -- operation that belongs to one of the interfaces in Ifaces_List.
9117 Candidate
: Entity_Id
:= Empty
;
9118 Hom
: Entity_Id
:= Empty
;
9119 Subp
: Entity_Id
:= Empty
;
9122 -- Traverse the homonym chain, looking for a potentially
9123 -- overridden subprogram that belongs to an implemented
9126 Hom
:= Current_Entity_In_Scope
(Def_Id
);
9127 while Present
(Hom
) loop
9131 or else not Is_Overloadable
(Subp
)
9132 or else not Is_Primitive
(Subp
)
9133 or else not Is_Dispatching_Operation
(Subp
)
9134 or else not Present
(Find_Dispatching_Type
(Subp
))
9135 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
9139 -- Entries and procedures can override abstract or null
9140 -- interface procedures.
9142 elsif (Ekind
(Def_Id
) = E_Procedure
9143 or else Ekind
(Def_Id
) = E_Entry
)
9144 and then Ekind
(Subp
) = E_Procedure
9145 and then Matches_Prefixed_View_Profile
9146 (Parameter_Specifications
(Parent
(Def_Id
)),
9147 Parameter_Specifications
(Parent
(Subp
)))
9151 -- For an overridden subprogram Subp, check whether the mode
9152 -- of its first parameter is correct depending on the kind
9153 -- of synchronized type.
9156 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
9159 -- In order for an entry or a protected procedure to
9160 -- override, the first parameter of the overridden
9161 -- routine must be of mode "out", "in out" or
9162 -- access-to-variable.
9164 if Ekind_In
(Candidate
, E_Entry
, E_Procedure
)
9165 and then Is_Protected_Type
(Typ
)
9166 and then Ekind
(Formal
) /= E_In_Out_Parameter
9167 and then Ekind
(Formal
) /= E_Out_Parameter
9168 and then Nkind
(Parameter_Type
(Parent
(Formal
))) /=
9173 -- All other cases are OK since a task entry or routine
9174 -- does not have a restriction on the mode of the first
9175 -- parameter of the overridden interface routine.
9178 Overridden_Subp
:= Candidate
;
9183 -- Functions can override abstract interface functions
9185 elsif Ekind
(Def_Id
) = E_Function
9186 and then Ekind
(Subp
) = E_Function
9187 and then Matches_Prefixed_View_Profile
9188 (Parameter_Specifications
(Parent
(Def_Id
)),
9189 Parameter_Specifications
(Parent
(Subp
)))
9190 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
9191 Etype
(Result_Definition
(Parent
(Subp
)))
9195 -- If an inherited subprogram is implemented by a protected
9196 -- function, then the first parameter of the inherited
9197 -- subprogram shall be of mode in, but not an
9198 -- access-to-variable parameter (RM 9.4(11/9)
9200 if Present
(First_Formal
(Subp
))
9201 and then Ekind
(First_Formal
(Subp
)) = E_In_Parameter
9203 (not Is_Access_Type
(Etype
(First_Formal
(Subp
)))
9205 Is_Access_Constant
(Etype
(First_Formal
(Subp
))))
9207 Overridden_Subp
:= Subp
;
9212 Hom
:= Homonym
(Hom
);
9215 -- After examining all candidates for overriding, we are left with
9216 -- the best match which is a mode incompatible interface routine.
9218 if In_Scope
and then Present
(Candidate
) then
9219 Error_Msg_PT
(Def_Id
, Candidate
);
9222 Overridden_Subp
:= Candidate
;
9225 end Check_Synchronized_Overriding
;
9227 ----------------------------
9228 -- Is_Private_Declaration --
9229 ----------------------------
9231 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
9232 Priv_Decls
: List_Id
;
9233 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
9236 if Is_Package_Or_Generic_Package
(Current_Scope
)
9237 and then In_Private_Part
(Current_Scope
)
9240 Private_Declarations
(Package_Specification
(Current_Scope
));
9242 return In_Package_Body
(Current_Scope
)
9244 (Is_List_Member
(Decl
)
9245 and then List_Containing
(Decl
) = Priv_Decls
)
9246 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
9249 (Defining_Entity
(Parent
(Decl
)))
9250 and then List_Containing
(Parent
(Parent
(Decl
))) =
9255 end Is_Private_Declaration
;
9257 --------------------------
9258 -- Is_Overriding_Alias --
9259 --------------------------
9261 function Is_Overriding_Alias
9263 New_E
: Entity_Id
) return Boolean
9265 AO
: constant Entity_Id
:= Alias
(Old_E
);
9266 AN
: constant Entity_Id
:= Alias
(New_E
);
9268 return Scope
(AO
) /= Scope
(AN
)
9269 or else No
(DTC_Entity
(AO
))
9270 or else No
(DTC_Entity
(AN
))
9271 or else DT_Position
(AO
) = DT_Position
(AN
);
9272 end Is_Overriding_Alias
;
9274 -- Start of processing for New_Overloaded_Entity
9277 -- We need to look for an entity that S may override. This must be a
9278 -- homonym in the current scope, so we look for the first homonym of
9279 -- S in the current scope as the starting point for the search.
9281 E
:= Current_Entity_In_Scope
(S
);
9283 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
9284 -- They are directly added to the list of primitive operations of
9285 -- Derived_Type, unless this is a rederivation in the private part
9286 -- of an operation that was already derived in the visible part of
9287 -- the current package.
9289 if Ada_Version
>= Ada_2005
9290 and then Present
(Derived_Type
)
9291 and then Present
(Alias
(S
))
9292 and then Is_Dispatching_Operation
(Alias
(S
))
9293 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
9294 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
9296 -- For private types, when the full-view is processed we propagate to
9297 -- the full view the non-overridden entities whose attribute "alias"
9298 -- references an interface primitive. These entities were added by
9299 -- Derive_Subprograms to ensure that interface primitives are
9302 -- Inside_Freeze_Actions is non zero when S corresponds with an
9303 -- internal entity that links an interface primitive with its
9304 -- covering primitive through attribute Interface_Alias (see
9305 -- Add_Internal_Interface_Entities).
9307 if Inside_Freezing_Actions
= 0
9308 and then Is_Package_Or_Generic_Package
(Current_Scope
)
9309 and then In_Private_Part
(Current_Scope
)
9310 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
9311 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
9312 and then Full_View
(Defining_Identifier
(Parent
(E
)))
9313 = Defining_Identifier
(Parent
(S
))
9314 and then Alias
(E
) = Alias
(S
)
9316 Check_Operation_From_Private_View
(S
, E
);
9317 Set_Is_Dispatching_Operation
(S
);
9322 Enter_Overloaded_Entity
(S
);
9323 Check_Dispatching_Operation
(S
, Empty
);
9324 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9330 -- If there is no homonym then this is definitely not overriding
9333 Enter_Overloaded_Entity
(S
);
9334 Check_Dispatching_Operation
(S
, Empty
);
9335 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9337 -- If subprogram has an explicit declaration, check whether it has an
9338 -- overriding indicator.
9340 if Comes_From_Source
(S
) then
9341 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9343 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
9344 -- it may have overridden some hidden inherited primitive. Update
9345 -- Overridden_Subp to avoid spurious errors when checking the
9346 -- overriding indicator.
9348 if Ada_Version
>= Ada_2012
9349 and then No
(Overridden_Subp
)
9350 and then Is_Dispatching_Operation
(S
)
9351 and then Present
(Overridden_Operation
(S
))
9353 Overridden_Subp
:= Overridden_Operation
(S
);
9356 Check_Overriding_Indicator
9357 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9360 -- If there is a homonym that is not overloadable, then we have an
9361 -- error, except for the special cases checked explicitly below.
9363 elsif not Is_Overloadable
(E
) then
9365 -- Check for spurious conflict produced by a subprogram that has the
9366 -- same name as that of the enclosing generic package. The conflict
9367 -- occurs within an instance, between the subprogram and the renaming
9368 -- declaration for the package. After the subprogram, the package
9369 -- renaming declaration becomes hidden.
9371 if Ekind
(E
) = E_Package
9372 and then Present
(Renamed_Object
(E
))
9373 and then Renamed_Object
(E
) = Current_Scope
9374 and then Nkind
(Parent
(Renamed_Object
(E
))) =
9375 N_Package_Specification
9376 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
9379 Set_Is_Immediately_Visible
(E
, False);
9380 Enter_Overloaded_Entity
(S
);
9381 Set_Homonym
(S
, Homonym
(E
));
9382 Check_Dispatching_Operation
(S
, Empty
);
9383 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
9385 -- If the subprogram is implicit it is hidden by the previous
9386 -- declaration. However if it is dispatching, it must appear in the
9387 -- dispatch table anyway, because it can be dispatched to even if it
9388 -- cannot be called directly.
9390 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
9391 Set_Scope
(S
, Current_Scope
);
9393 if Is_Dispatching_Operation
(Alias
(S
)) then
9394 Check_Dispatching_Operation
(S
, Empty
);
9400 Error_Msg_Sloc
:= Sloc
(E
);
9402 -- Generate message, with useful additional warning if in generic
9404 if Is_Generic_Unit
(E
) then
9405 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
9406 Error_Msg_N
("\& conflicts with declaration#", S
);
9408 Error_Msg_N
("& conflicts with declaration#", S
);
9414 -- E exists and is overloadable
9417 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
9419 -- Loop through E and its homonyms to determine if any of them is
9420 -- the candidate for overriding by S.
9422 while Present
(E
) loop
9424 -- Definitely not interesting if not in the current scope
9426 if Scope
(E
) /= Current_Scope
then
9429 -- A function can overload the name of an abstract state. The
9430 -- state can be viewed as a function with a profile that cannot
9431 -- be matched by anything.
9433 elsif Ekind
(S
) = E_Function
9434 and then Ekind
(E
) = E_Abstract_State
9436 Enter_Overloaded_Entity
(S
);
9439 -- Ada 2012 (AI05-0165): For internally generated bodies of null
9440 -- procedures locate the internally generated spec. We enforce
9441 -- mode conformance since a tagged type may inherit from
9442 -- interfaces several null primitives which differ only in
9443 -- the mode of the formals.
9445 elsif not Comes_From_Source
(S
)
9446 and then Is_Null_Procedure
(S
)
9447 and then not Mode_Conformant
(E
, S
)
9451 -- Check if we have type conformance
9453 elsif Type_Conformant
(E
, S
) then
9455 -- If the old and new entities have the same profile and one
9456 -- is not the body of the other, then this is an error, unless
9457 -- one of them is implicitly declared.
9459 -- There are some cases when both can be implicit, for example
9460 -- when both a literal and a function that overrides it are
9461 -- inherited in a derivation, or when an inherited operation
9462 -- of a tagged full type overrides the inherited operation of
9463 -- a private extension. Ada 83 had a special rule for the
9464 -- literal case. In Ada 95, the later implicit operation hides
9465 -- the former, and the literal is always the former. In the
9466 -- odd case where both are derived operations declared at the
9467 -- same point, both operations should be declared, and in that
9468 -- case we bypass the following test and proceed to the next
9469 -- part. This can only occur for certain obscure cases in
9470 -- instances, when an operation on a type derived from a formal
9471 -- private type does not override a homograph inherited from
9472 -- the actual. In subsequent derivations of such a type, the
9473 -- DT positions of these operations remain distinct, if they
9476 if Present
(Alias
(S
))
9477 and then (No
(Alias
(E
))
9478 or else Comes_From_Source
(E
)
9479 or else Is_Abstract_Subprogram
(S
)
9481 (Is_Dispatching_Operation
(E
)
9482 and then Is_Overriding_Alias
(E
, S
)))
9483 and then Ekind
(E
) /= E_Enumeration_Literal
9485 -- When an derived operation is overloaded it may be due to
9486 -- the fact that the full view of a private extension
9487 -- re-inherits. It has to be dealt with.
9489 if Is_Package_Or_Generic_Package
(Current_Scope
)
9490 and then In_Private_Part
(Current_Scope
)
9492 Check_Operation_From_Private_View
(S
, E
);
9495 -- In any case the implicit operation remains hidden by the
9496 -- existing declaration, which is overriding. Indicate that
9497 -- E overrides the operation from which S is inherited.
9499 if Present
(Alias
(S
)) then
9500 Set_Overridden_Operation
(E
, Alias
(S
));
9501 Inherit_Subprogram_Contract
(E
, Alias
(S
));
9504 Set_Overridden_Operation
(E
, S
);
9505 Inherit_Subprogram_Contract
(E
, S
);
9508 if Comes_From_Source
(E
) then
9509 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
9514 -- Within an instance, the renaming declarations for actual
9515 -- subprograms may become ambiguous, but they do not hide each
9518 elsif Ekind
(E
) /= E_Entry
9519 and then not Comes_From_Source
(E
)
9520 and then not Is_Generic_Instance
(E
)
9521 and then (Present
(Alias
(E
))
9522 or else Is_Intrinsic_Subprogram
(E
))
9523 and then (not In_Instance
9524 or else No
(Parent
(E
))
9525 or else Nkind
(Unit_Declaration_Node
(E
)) /=
9526 N_Subprogram_Renaming_Declaration
)
9528 -- A subprogram child unit is not allowed to override an
9529 -- inherited subprogram (10.1.1(20)).
9531 if Is_Child_Unit
(S
) then
9533 ("child unit overrides inherited subprogram in parent",
9538 if Is_Non_Overriding_Operation
(E
, S
) then
9539 Enter_Overloaded_Entity
(S
);
9541 if No
(Derived_Type
)
9542 or else Is_Tagged_Type
(Derived_Type
)
9544 Check_Dispatching_Operation
(S
, Empty
);
9550 -- E is a derived operation or an internal operator which
9551 -- is being overridden. Remove E from further visibility.
9552 -- Furthermore, if E is a dispatching operation, it must be
9553 -- replaced in the list of primitive operations of its type
9554 -- (see Override_Dispatching_Operation).
9556 Overridden_Subp
:= E
;
9562 Prev
:= First_Entity
(Current_Scope
);
9563 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
9567 -- It is possible for E to be in the current scope and
9568 -- yet not in the entity chain. This can only occur in a
9569 -- generic context where E is an implicit concatenation
9570 -- in the formal part, because in a generic body the
9571 -- entity chain starts with the formals.
9573 -- In GNATprove mode, a wrapper for an operation with
9574 -- axiomatization may be a homonym of another declaration
9575 -- for an actual subprogram (needs refinement ???).
9579 and then GNATprove_Mode
9581 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
9582 N_Subprogram_Renaming_Declaration
9586 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
9591 -- E must be removed both from the entity_list of the
9592 -- current scope, and from the visibility chain.
9594 if Debug_Flag_E
then
9595 Write_Str
("Override implicit operation ");
9596 Write_Int
(Int
(E
));
9600 -- If E is a predefined concatenation, it stands for four
9601 -- different operations. As a result, a single explicit
9602 -- declaration does not hide it. In a possible ambiguous
9603 -- situation, Disambiguate chooses the user-defined op,
9604 -- so it is correct to retain the previous internal one.
9606 if Chars
(E
) /= Name_Op_Concat
9607 or else Ekind
(E
) /= E_Operator
9609 -- For nondispatching derived operations that are
9610 -- overridden by a subprogram declared in the private
9611 -- part of a package, we retain the derived subprogram
9612 -- but mark it as not immediately visible. If the
9613 -- derived operation was declared in the visible part
9614 -- then this ensures that it will still be visible
9615 -- outside the package with the proper signature
9616 -- (calls from outside must also be directed to this
9617 -- version rather than the overriding one, unlike the
9618 -- dispatching case). Calls from inside the package
9619 -- will still resolve to the overriding subprogram
9620 -- since the derived one is marked as not visible
9621 -- within the package.
9623 -- If the private operation is dispatching, we achieve
9624 -- the overriding by keeping the implicit operation
9625 -- but setting its alias to be the overriding one. In
9626 -- this fashion the proper body is executed in all
9627 -- cases, but the original signature is used outside
9630 -- If the overriding is not in the private part, we
9631 -- remove the implicit operation altogether.
9633 if Is_Private_Declaration
(S
) then
9634 if not Is_Dispatching_Operation
(E
) then
9635 Set_Is_Immediately_Visible
(E
, False);
9637 -- Work done in Override_Dispatching_Operation,
9638 -- so nothing else needs to be done here.
9644 -- Find predecessor of E in Homonym chain
9646 if E
= Current_Entity
(E
) then
9649 Prev_Vis
:= Current_Entity
(E
);
9650 while Homonym
(Prev_Vis
) /= E
loop
9651 Prev_Vis
:= Homonym
(Prev_Vis
);
9655 if Prev_Vis
/= Empty
then
9657 -- Skip E in the visibility chain
9659 Set_Homonym
(Prev_Vis
, Homonym
(E
));
9662 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
9665 Set_Next_Entity
(Prev
, Next_Entity
(E
));
9667 if No
(Next_Entity
(Prev
)) then
9668 Set_Last_Entity
(Current_Scope
, Prev
);
9673 Enter_Overloaded_Entity
(S
);
9675 -- For entities generated by Derive_Subprograms the
9676 -- overridden operation is the inherited primitive
9677 -- (which is available through the attribute alias).
9679 if not (Comes_From_Source
(E
))
9680 and then Is_Dispatching_Operation
(E
)
9681 and then Find_Dispatching_Type
(E
) =
9682 Find_Dispatching_Type
(S
)
9683 and then Present
(Alias
(E
))
9684 and then Comes_From_Source
(Alias
(E
))
9686 Set_Overridden_Operation
(S
, Alias
(E
));
9687 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9689 -- Normal case of setting entity as overridden
9691 -- Note: Static_Initialization and Overridden_Operation
9692 -- attributes use the same field in subprogram entities.
9693 -- Static_Initialization is only defined for internal
9694 -- initialization procedures, where Overridden_Operation
9695 -- is irrelevant. Therefore the setting of this attribute
9696 -- must check whether the target is an init_proc.
9698 elsif not Is_Init_Proc
(S
) then
9699 Set_Overridden_Operation
(S
, E
);
9700 Inherit_Subprogram_Contract
(S
, E
);
9703 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
9705 -- If S is a user-defined subprogram or a null procedure
9706 -- expanded to override an inherited null procedure, or a
9707 -- predefined dispatching primitive then indicate that E
9708 -- overrides the operation from which S is inherited.
9710 if Comes_From_Source
(S
)
9712 (Present
(Parent
(S
))
9714 Nkind
(Parent
(S
)) = N_Procedure_Specification
9716 Null_Present
(Parent
(S
)))
9718 (Present
(Alias
(E
))
9720 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
9722 if Present
(Alias
(E
)) then
9723 Set_Overridden_Operation
(S
, Alias
(E
));
9724 Inherit_Subprogram_Contract
(S
, Alias
(E
));
9728 if Is_Dispatching_Operation
(E
) then
9730 -- An overriding dispatching subprogram inherits the
9731 -- convention of the overridden subprogram (AI-117).
9733 Set_Convention
(S
, Convention
(E
));
9734 Check_Dispatching_Operation
(S
, E
);
9737 Check_Dispatching_Operation
(S
, Empty
);
9740 Check_For_Primitive_Subprogram
9741 (Is_Primitive_Subp
, Is_Overriding
=> True);
9742 goto Check_Inequality
;
9745 -- Apparent redeclarations in instances can occur when two
9746 -- formal types get the same actual type. The subprograms in
9747 -- in the instance are legal, even if not callable from the
9748 -- outside. Calls from within are disambiguated elsewhere.
9749 -- For dispatching operations in the visible part, the usual
9750 -- rules apply, and operations with the same profile are not
9753 elsif (In_Instance_Visible_Part
9754 and then not Is_Dispatching_Operation
(E
))
9755 or else In_Instance_Not_Visible
9759 -- Here we have a real error (identical profile)
9762 Error_Msg_Sloc
:= Sloc
(E
);
9764 -- Avoid cascaded errors if the entity appears in
9765 -- subsequent calls.
9767 Set_Scope
(S
, Current_Scope
);
9769 -- Generate error, with extra useful warning for the case
9770 -- of a generic instance with no completion.
9772 if Is_Generic_Instance
(S
)
9773 and then not Has_Completion
(E
)
9776 ("instantiation cannot provide body for&", S
);
9777 Error_Msg_N
("\& conflicts with declaration#", S
);
9779 Error_Msg_N
("& conflicts with declaration#", S
);
9786 -- If one subprogram has an access parameter and the other
9787 -- a parameter of an access type, calls to either might be
9788 -- ambiguous. Verify that parameters match except for the
9789 -- access parameter.
9791 if May_Hide_Profile
then
9797 F1
:= First_Formal
(S
);
9798 F2
:= First_Formal
(E
);
9799 while Present
(F1
) and then Present
(F2
) loop
9800 if Is_Access_Type
(Etype
(F1
)) then
9801 if not Is_Access_Type
(Etype
(F2
))
9802 or else not Conforming_Types
9803 (Designated_Type
(Etype
(F1
)),
9804 Designated_Type
(Etype
(F2
)),
9807 May_Hide_Profile
:= False;
9811 not Conforming_Types
9812 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
9814 May_Hide_Profile
:= False;
9825 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
9834 -- On exit, we know that S is a new entity
9836 Enter_Overloaded_Entity
(S
);
9837 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
9838 Check_Overriding_Indicator
9839 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
9841 -- Overloading is not allowed in SPARK, except for operators
9843 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
9844 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
9845 Check_SPARK_05_Restriction
9846 ("overloading not allowed with entity#", S
);
9849 -- If S is a derived operation for an untagged type then by
9850 -- definition it's not a dispatching operation (even if the parent
9851 -- operation was dispatching), so Check_Dispatching_Operation is not
9852 -- called in that case.
9854 if No
(Derived_Type
)
9855 or else Is_Tagged_Type
(Derived_Type
)
9857 Check_Dispatching_Operation
(S
, Empty
);
9861 -- If this is a user-defined equality operator that is not a derived
9862 -- subprogram, create the corresponding inequality. If the operation is
9863 -- dispatching, the expansion is done elsewhere, and we do not create
9864 -- an explicit inequality operation.
9866 <<Check_Inequality
>>
9867 if Chars
(S
) = Name_Op_Eq
9868 and then Etype
(S
) = Standard_Boolean
9869 and then Present
(Parent
(S
))
9870 and then not Is_Dispatching_Operation
(S
)
9872 Make_Inequality_Operator
(S
);
9873 Check_Untagged_Equality
(S
);
9875 end New_Overloaded_Entity
;
9877 ---------------------
9878 -- Process_Formals --
9879 ---------------------
9881 procedure Process_Formals
9883 Related_Nod
: Node_Id
)
9885 Context
: constant Node_Id
:= Parent
(Parent
(T
));
9886 Param_Spec
: Node_Id
;
9888 Formal_Type
: Entity_Id
;
9892 Num_Out_Params
: Nat
:= 0;
9893 First_Out_Param
: Entity_Id
:= Empty
;
9894 -- Used for setting Is_Only_Out_Parameter
9896 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
9897 -- Determine whether an access type designates a type coming from a
9900 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
9901 -- Check whether the default has a class-wide type. After analysis the
9902 -- default has the type of the formal, so we must also check explicitly
9903 -- for an access attribute.
9905 ----------------------------------
9906 -- Designates_From_Limited_With --
9907 ----------------------------------
9909 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
9910 Desig
: Entity_Id
:= Typ
;
9913 if Is_Access_Type
(Desig
) then
9914 Desig
:= Directly_Designated_Type
(Desig
);
9917 if Is_Class_Wide_Type
(Desig
) then
9918 Desig
:= Root_Type
(Desig
);
9922 Ekind
(Desig
) = E_Incomplete_Type
9923 and then From_Limited_With
(Desig
);
9924 end Designates_From_Limited_With
;
9926 ---------------------------
9927 -- Is_Class_Wide_Default --
9928 ---------------------------
9930 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
9932 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
9933 or else (Nkind
(D
) = N_Attribute_Reference
9934 and then Attribute_Name
(D
) = Name_Access
9935 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
9936 end Is_Class_Wide_Default
;
9938 -- Start of processing for Process_Formals
9941 -- In order to prevent premature use of the formals in the same formal
9942 -- part, the Ekind is left undefined until all default expressions are
9943 -- analyzed. The Ekind is established in a separate loop at the end.
9945 Param_Spec
:= First
(T
);
9946 while Present
(Param_Spec
) loop
9947 Formal
:= Defining_Identifier
(Param_Spec
);
9948 Set_Never_Set_In_Source
(Formal
, True);
9949 Enter_Name
(Formal
);
9951 -- Case of ordinary parameters
9953 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
9954 Find_Type
(Parameter_Type
(Param_Spec
));
9955 Ptype
:= Parameter_Type
(Param_Spec
);
9957 if Ptype
= Error
then
9961 Formal_Type
:= Entity
(Ptype
);
9963 if Is_Incomplete_Type
(Formal_Type
)
9965 (Is_Class_Wide_Type
(Formal_Type
)
9966 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
9968 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
9969 -- primitive operations, as long as their completion is
9970 -- in the same declarative part. If in the private part
9971 -- this means that the type cannot be a Taft-amendment type.
9972 -- Check is done on package exit. For access to subprograms,
9973 -- the use is legal for Taft-amendment types.
9975 -- Ada 2012: tagged incomplete types are allowed as generic
9976 -- formal types. They do not introduce dependencies and the
9977 -- corresponding generic subprogram does not have a delayed
9978 -- freeze, because it does not need a freeze node. However,
9979 -- it is still the case that untagged incomplete types cannot
9980 -- be Taft-amendment types and must be completed in private
9981 -- part, so the subprogram must appear in the list of private
9982 -- dependents of the type. If the type is class-wide, it is
9983 -- not a primitive, but the freezing of the subprogram must
9984 -- also be delayed to force the creation of a freeze node.
9986 if Is_Tagged_Type
(Formal_Type
)
9987 or else (Ada_Version
>= Ada_2012
9988 and then not From_Limited_With
(Formal_Type
)
9989 and then not Is_Generic_Type
(Formal_Type
))
9991 if Ekind
(Scope
(Current_Scope
)) = E_Package
9992 and then not Is_Generic_Type
(Formal_Type
)
9995 (Parent
(T
), N_Access_Function_Definition
,
9996 N_Access_Procedure_Definition
)
9998 if not Is_Class_Wide_Type
(Formal_Type
) then
9999 Append_Elmt
(Current_Scope
,
10000 Private_Dependents
(Base_Type
(Formal_Type
)));
10003 -- Freezing is delayed to ensure that Register_Prim
10004 -- will get called for this operation, which is needed
10005 -- in cases where static dispatch tables aren't built.
10006 -- (Note that the same is done for controlling access
10007 -- parameter cases in function Access_Definition.)
10009 if not Is_Thunk
(Current_Scope
) then
10010 Set_Has_Delayed_Freeze
(Current_Scope
);
10015 -- Special handling of Value_Type for CIL case
10017 elsif Is_Value_Type
(Formal_Type
) then
10020 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
10021 N_Access_Procedure_Definition
)
10023 -- AI05-0151: Tagged incomplete types are allowed in all
10024 -- formal parts. Untagged incomplete types are not allowed
10025 -- in bodies. Limited views of either kind are not allowed
10026 -- if there is no place at which the non-limited view can
10027 -- become available.
10029 -- Incomplete formal untagged types are not allowed in
10030 -- subprogram bodies (but are legal in their declarations).
10031 -- This excludes bodies created for null procedures, which
10032 -- are basic declarations.
10034 if Is_Generic_Type
(Formal_Type
)
10035 and then not Is_Tagged_Type
(Formal_Type
)
10036 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
10039 ("invalid use of formal incomplete type", Param_Spec
);
10041 elsif Ada_Version
>= Ada_2012
then
10042 if Is_Tagged_Type
(Formal_Type
)
10043 and then (not From_Limited_With
(Formal_Type
)
10044 or else not In_Package_Body
)
10048 elsif Nkind_In
(Context
, N_Accept_Statement
,
10049 N_Accept_Alternative
,
10051 or else (Nkind
(Context
) = N_Subprogram_Body
10052 and then Comes_From_Source
(Context
))
10055 ("invalid use of untagged incomplete type &",
10056 Ptype
, Formal_Type
);
10061 ("invalid use of incomplete type&",
10062 Param_Spec
, Formal_Type
);
10064 -- Further checks on the legality of incomplete types
10065 -- in formal parts are delayed until the freeze point
10066 -- of the enclosing subprogram or access to subprogram.
10070 elsif Ekind
(Formal_Type
) = E_Void
then
10072 ("premature use of&",
10073 Parameter_Type
(Param_Spec
), Formal_Type
);
10076 -- Ada 2012 (AI-142): Handle aliased parameters
10078 if Ada_Version
>= Ada_2012
10079 and then Aliased_Present
(Param_Spec
)
10081 Set_Is_Aliased
(Formal
);
10084 -- Ada 2005 (AI-231): Create and decorate an internal subtype
10085 -- declaration corresponding to the null-excluding type of the
10086 -- formal in the enclosing scope. Finally, replace the parameter
10087 -- type of the formal with the internal subtype.
10089 if Ada_Version
>= Ada_2005
10090 and then Null_Exclusion_Present
(Param_Spec
)
10092 if not Is_Access_Type
(Formal_Type
) then
10094 ("`NOT NULL` allowed only for an access type", Param_Spec
);
10097 if Can_Never_Be_Null
(Formal_Type
)
10098 and then Comes_From_Source
(Related_Nod
)
10101 ("`NOT NULL` not allowed (& already excludes null)",
10102 Param_Spec
, Formal_Type
);
10106 Create_Null_Excluding_Itype
10108 Related_Nod
=> Related_Nod
,
10109 Scope_Id
=> Scope
(Current_Scope
));
10111 -- If the designated type of the itype is an itype that is
10112 -- not frozen yet, we set the Has_Delayed_Freeze attribute
10113 -- on the access subtype, to prevent order-of-elaboration
10114 -- issues in the backend.
10117 -- type T is access procedure;
10118 -- procedure Op (O : not null T);
10120 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
10122 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
10124 Set_Has_Delayed_Freeze
(Formal_Type
);
10129 -- An access formal type
10133 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
10135 -- No need to continue if we already notified errors
10137 if not Present
(Formal_Type
) then
10141 -- Ada 2005 (AI-254)
10144 AD
: constant Node_Id
:=
10145 Access_To_Subprogram_Definition
10146 (Parameter_Type
(Param_Spec
));
10148 if Present
(AD
) and then Protected_Present
(AD
) then
10150 Replace_Anonymous_Access_To_Protected_Subprogram
10156 Set_Etype
(Formal
, Formal_Type
);
10158 -- Deal with default expression if present
10160 Default
:= Expression
(Param_Spec
);
10162 if Present
(Default
) then
10163 Check_SPARK_05_Restriction
10164 ("default expression is not allowed", Default
);
10166 if Out_Present
(Param_Spec
) then
10168 ("default initialization only allowed for IN parameters",
10172 -- Do the special preanalysis of the expression (see section on
10173 -- "Handling of Default Expressions" in the spec of package Sem).
10175 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
10177 -- An access to constant cannot be the default for
10178 -- an access parameter that is an access to variable.
10180 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10181 and then not Is_Access_Constant
(Formal_Type
)
10182 and then Is_Access_Type
(Etype
(Default
))
10183 and then Is_Access_Constant
(Etype
(Default
))
10186 ("formal that is access to variable cannot be initialized "
10187 & "with an access-to-constant expression", Default
);
10190 -- Check that the designated type of an access parameter's default
10191 -- is not a class-wide type unless the parameter's designated type
10192 -- is also class-wide.
10194 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
10195 and then not Designates_From_Limited_With
(Formal_Type
)
10196 and then Is_Class_Wide_Default
(Default
)
10197 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
10200 ("access to class-wide expression not allowed here", Default
);
10203 -- Check incorrect use of dynamically tagged expressions
10205 if Is_Tagged_Type
(Formal_Type
) then
10206 Check_Dynamically_Tagged_Expression
10208 Typ
=> Formal_Type
,
10209 Related_Nod
=> Default
);
10213 -- Ada 2005 (AI-231): Static checks
10215 if Ada_Version
>= Ada_2005
10216 and then Is_Access_Type
(Etype
(Formal
))
10217 and then Can_Never_Be_Null
(Etype
(Formal
))
10219 Null_Exclusion_Static_Checks
(Param_Spec
);
10222 -- The following checks are relevant when SPARK_Mode is on as these
10223 -- are not standard Ada legality rules.
10225 if SPARK_Mode
= On
then
10226 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
10228 -- A function cannot have a parameter of mode IN OUT or OUT
10231 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
10233 ("function cannot have parameter of mode `OUT` or "
10234 & "`IN OUT`", Formal
);
10236 -- A function cannot have an effectively volatile formal
10237 -- parameter (SPARK RM 7.1.3(10)).
10239 elsif Is_Effectively_Volatile
(Formal
) then
10241 ("function cannot have a volatile formal parameter",
10245 -- A procedure cannot have an effectively volatile formal
10246 -- parameter of mode IN because it behaves as a constant
10247 -- (SPARK RM 7.1.3(6)).
10249 elsif Ekind
(Scope
(Formal
)) = E_Procedure
10250 and then Ekind
(Formal
) = E_In_Parameter
10251 and then Is_Effectively_Volatile
(Formal
)
10254 ("formal parameter of mode `IN` cannot be volatile", Formal
);
10262 -- If this is the formal part of a function specification, analyze the
10263 -- subtype mark in the context where the formals are visible but not
10264 -- yet usable, and may hide outer homographs.
10266 if Nkind
(Related_Nod
) = N_Function_Specification
then
10267 Analyze_Return_Type
(Related_Nod
);
10270 -- Now set the kind (mode) of each formal
10272 Param_Spec
:= First
(T
);
10273 while Present
(Param_Spec
) loop
10274 Formal
:= Defining_Identifier
(Param_Spec
);
10275 Set_Formal_Mode
(Formal
);
10277 if Ekind
(Formal
) = E_In_Parameter
then
10278 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
10280 if Present
(Expression
(Param_Spec
)) then
10281 Default
:= Expression
(Param_Spec
);
10283 if Is_Scalar_Type
(Etype
(Default
)) then
10284 if Nkind
(Parameter_Type
(Param_Spec
)) /=
10285 N_Access_Definition
10287 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
10291 (Related_Nod
, Parameter_Type
(Param_Spec
));
10294 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
10298 elsif Ekind
(Formal
) = E_Out_Parameter
then
10299 Num_Out_Params
:= Num_Out_Params
+ 1;
10301 if Num_Out_Params
= 1 then
10302 First_Out_Param
:= Formal
;
10305 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
10306 Num_Out_Params
:= Num_Out_Params
+ 1;
10309 -- Skip remaining processing if formal type was in error
10311 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
10312 goto Next_Parameter
;
10315 -- Force call by reference if aliased
10317 if Is_Aliased
(Formal
) then
10318 Set_Mechanism
(Formal
, By_Reference
);
10320 -- Warn if user asked this to be passed by copy
10322 if Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10324 ("cannot pass aliased parameter & by copy??", Formal
);
10327 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
10329 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Copy
then
10330 Set_Mechanism
(Formal
, By_Copy
);
10332 elsif Convention
(Formal_Type
) = Convention_Ada_Pass_By_Reference
then
10333 Set_Mechanism
(Formal
, By_Reference
);
10340 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
10341 Set_Is_Only_Out_Parameter
(First_Out_Param
);
10343 end Process_Formals
;
10345 ----------------------------
10346 -- Reference_Body_Formals --
10347 ----------------------------
10349 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
10354 if Error_Posted
(Spec
) then
10358 -- Iterate over both lists. They may be of different lengths if the two
10359 -- specs are not conformant.
10361 Fs
:= First_Formal
(Spec
);
10362 Fb
:= First_Formal
(Bod
);
10363 while Present
(Fs
) and then Present
(Fb
) loop
10364 Generate_Reference
(Fs
, Fb
, 'b');
10366 if Style_Check
then
10367 Style
.Check_Identifier
(Fb
, Fs
);
10370 Set_Spec_Entity
(Fb
, Fs
);
10371 Set_Referenced
(Fs
, False);
10375 end Reference_Body_Formals
;
10377 -------------------------
10378 -- Set_Actual_Subtypes --
10379 -------------------------
10381 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
10383 Formal
: Entity_Id
;
10385 First_Stmt
: Node_Id
:= Empty
;
10386 AS_Needed
: Boolean;
10389 -- If this is an empty initialization procedure, no need to create
10390 -- actual subtypes (small optimization).
10392 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
10396 Formal
:= First_Formal
(Subp
);
10397 while Present
(Formal
) loop
10398 T
:= Etype
(Formal
);
10400 -- We never need an actual subtype for a constrained formal
10402 if Is_Constrained
(T
) then
10403 AS_Needed
:= False;
10405 -- If we have unknown discriminants, then we do not need an actual
10406 -- subtype, or more accurately we cannot figure it out. Note that
10407 -- all class-wide types have unknown discriminants.
10409 elsif Has_Unknown_Discriminants
(T
) then
10410 AS_Needed
:= False;
10412 -- At this stage we have an unconstrained type that may need an
10413 -- actual subtype. For sure the actual subtype is needed if we have
10414 -- an unconstrained array type.
10416 elsif Is_Array_Type
(T
) then
10419 -- The only other case needing an actual subtype is an unconstrained
10420 -- record type which is an IN parameter (we cannot generate actual
10421 -- subtypes for the OUT or IN OUT case, since an assignment can
10422 -- change the discriminant values. However we exclude the case of
10423 -- initialization procedures, since discriminants are handled very
10424 -- specially in this context, see the section entitled "Handling of
10425 -- Discriminants" in Einfo.
10427 -- We also exclude the case of Discrim_SO_Functions (functions used
10428 -- in front end layout mode for size/offset values), since in such
10429 -- functions only discriminants are referenced, and not only are such
10430 -- subtypes not needed, but they cannot always be generated, because
10431 -- of order of elaboration issues.
10433 elsif Is_Record_Type
(T
)
10434 and then Ekind
(Formal
) = E_In_Parameter
10435 and then Chars
(Formal
) /= Name_uInit
10436 and then not Is_Unchecked_Union
(T
)
10437 and then not Is_Discrim_SO_Function
(Subp
)
10441 -- All other cases do not need an actual subtype
10444 AS_Needed
:= False;
10447 -- Generate actual subtypes for unconstrained arrays and
10448 -- unconstrained discriminated records.
10451 if Nkind
(N
) = N_Accept_Statement
then
10453 -- If expansion is active, the formal is replaced by a local
10454 -- variable that renames the corresponding entry of the
10455 -- parameter block, and it is this local variable that may
10456 -- require an actual subtype.
10458 if Expander_Active
then
10459 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
10461 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10464 if Present
(Handled_Statement_Sequence
(N
)) then
10466 First
(Statements
(Handled_Statement_Sequence
(N
)));
10467 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
10468 Mark_Rewrite_Insertion
(Decl
);
10470 -- If the accept statement has no body, there will be no
10471 -- reference to the actuals, so no need to compute actual
10478 Decl
:= Build_Actual_Subtype
(T
, Formal
);
10479 Prepend
(Decl
, Declarations
(N
));
10480 Mark_Rewrite_Insertion
(Decl
);
10483 -- The declaration uses the bounds of an existing object, and
10484 -- therefore needs no constraint checks.
10486 Analyze
(Decl
, Suppress
=> All_Checks
);
10488 -- We need to freeze manually the generated type when it is
10489 -- inserted anywhere else than in a declarative part.
10491 if Present
(First_Stmt
) then
10492 Insert_List_Before_And_Analyze
(First_Stmt
,
10493 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10495 -- Ditto if the type has a dynamic predicate, because the
10496 -- generated function will mention the actual subtype.
10498 elsif Has_Dynamic_Predicate_Aspect
(T
) then
10499 Insert_List_Before_And_Analyze
(Decl
,
10500 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
10503 if Nkind
(N
) = N_Accept_Statement
10504 and then Expander_Active
10506 Set_Actual_Subtype
(Renamed_Object
(Formal
),
10507 Defining_Identifier
(Decl
));
10509 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
10513 Next_Formal
(Formal
);
10515 end Set_Actual_Subtypes
;
10517 ---------------------
10518 -- Set_Formal_Mode --
10519 ---------------------
10521 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
10522 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
10525 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
10526 -- since we ensure that corresponding actuals are always valid at the
10527 -- point of the call.
10529 if Out_Present
(Spec
) then
10530 if Ekind_In
(Scope
(Formal_Id
), E_Function
, E_Generic_Function
) then
10532 -- [IN] OUT parameters allowed for functions in Ada 2012
10534 if Ada_Version
>= Ada_2012
then
10536 -- Even in Ada 2012 operators can only have IN parameters
10538 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
10539 Error_Msg_N
("operators can only have IN parameters", Spec
);
10542 if In_Present
(Spec
) then
10543 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10545 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10548 Set_Has_Out_Or_In_Out_Parameter
(Scope
(Formal_Id
), True);
10550 -- But not in earlier versions of Ada
10553 Error_Msg_N
("functions can only have IN parameters", Spec
);
10554 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10557 elsif In_Present
(Spec
) then
10558 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
10561 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
10562 Set_Never_Set_In_Source
(Formal_Id
, True);
10563 Set_Is_True_Constant
(Formal_Id
, False);
10564 Set_Current_Value
(Formal_Id
, Empty
);
10568 Set_Ekind
(Formal_Id
, E_In_Parameter
);
10571 -- Set Is_Known_Non_Null for access parameters since the language
10572 -- guarantees that access parameters are always non-null. We also set
10573 -- Can_Never_Be_Null, since there is no way to change the value.
10575 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
10577 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
10578 -- null; In Ada 2005, only if then null_exclusion is explicit.
10580 if Ada_Version
< Ada_2005
10581 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
10583 Set_Is_Known_Non_Null
(Formal_Id
);
10584 Set_Can_Never_Be_Null
(Formal_Id
);
10587 -- Ada 2005 (AI-231): Null-exclusion access subtype
10589 elsif Is_Access_Type
(Etype
(Formal_Id
))
10590 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
10592 Set_Is_Known_Non_Null
(Formal_Id
);
10594 -- We can also set Can_Never_Be_Null (thus preventing some junk
10595 -- access checks) for the case of an IN parameter, which cannot
10596 -- be changed, or for an IN OUT parameter, which can be changed but
10597 -- not to a null value. But for an OUT parameter, the initial value
10598 -- passed in can be null, so we can't set this flag in that case.
10600 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
10601 Set_Can_Never_Be_Null
(Formal_Id
);
10605 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
10606 Set_Formal_Validity
(Formal_Id
);
10607 end Set_Formal_Mode
;
10609 -------------------------
10610 -- Set_Formal_Validity --
10611 -------------------------
10613 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
10615 -- If no validity checking, then we cannot assume anything about the
10616 -- validity of parameters, since we do not know there is any checking
10617 -- of the validity on the call side.
10619 if not Validity_Checks_On
then
10622 -- If validity checking for parameters is enabled, this means we are
10623 -- not supposed to make any assumptions about argument values.
10625 elsif Validity_Check_Parameters
then
10628 -- If we are checking in parameters, we will assume that the caller is
10629 -- also checking parameters, so we can assume the parameter is valid.
10631 elsif Ekind
(Formal_Id
) = E_In_Parameter
10632 and then Validity_Check_In_Params
10634 Set_Is_Known_Valid
(Formal_Id
, True);
10636 -- Similar treatment for IN OUT parameters
10638 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
10639 and then Validity_Check_In_Out_Params
10641 Set_Is_Known_Valid
(Formal_Id
, True);
10643 end Set_Formal_Validity
;
10645 ------------------------
10646 -- Subtype_Conformant --
10647 ------------------------
10649 function Subtype_Conformant
10650 (New_Id
: Entity_Id
;
10651 Old_Id
: Entity_Id
;
10652 Skip_Controlling_Formals
: Boolean := False) return Boolean
10656 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
10657 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10659 end Subtype_Conformant
;
10661 ---------------------
10662 -- Type_Conformant --
10663 ---------------------
10665 function Type_Conformant
10666 (New_Id
: Entity_Id
;
10667 Old_Id
: Entity_Id
;
10668 Skip_Controlling_Formals
: Boolean := False) return Boolean
10672 May_Hide_Profile
:= False;
10674 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
10675 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
10677 end Type_Conformant
;
10679 -------------------------------
10680 -- Valid_Operator_Definition --
10681 -------------------------------
10683 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
10686 Id
: constant Name_Id
:= Chars
(Designator
);
10690 F
:= First_Formal
(Designator
);
10691 while Present
(F
) loop
10694 if Present
(Default_Value
(F
)) then
10696 ("default values not allowed for operator parameters",
10699 -- For function instantiations that are operators, we must check
10700 -- separately that the corresponding generic only has in-parameters.
10701 -- For subprogram declarations this is done in Set_Formal_Mode. Such
10702 -- an error could not arise in earlier versions of the language.
10704 elsif Ekind
(F
) /= E_In_Parameter
then
10705 Error_Msg_N
("operators can only have IN parameters", F
);
10711 -- Verify that user-defined operators have proper number of arguments
10712 -- First case of operators which can only be unary
10714 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
10717 -- Case of operators which can be unary or binary
10719 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
10720 N_OK
:= (N
in 1 .. 2);
10722 -- All other operators can only be binary
10730 ("incorrect number of arguments for operator", Designator
);
10734 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
10735 and then not Is_Intrinsic_Subprogram
(Designator
)
10738 ("explicit definition of inequality not allowed", Designator
);
10740 end Valid_Operator_Definition
;