1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2018, 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 Contracts
; use Contracts
;
30 with Debug
; use Debug
;
31 with Einfo
; use Einfo
;
32 with Elists
; use Elists
;
33 with Errout
; use Errout
;
34 with Expander
; use Expander
;
35 with Exp_Ch6
; use Exp_Ch6
;
36 with Exp_Ch7
; use Exp_Ch7
;
37 with Exp_Ch9
; use Exp_Ch9
;
38 with Exp_Dbug
; use Exp_Dbug
;
39 with Exp_Tss
; use Exp_Tss
;
40 with Exp_Util
; use Exp_Util
;
41 with Freeze
; use Freeze
;
42 with Ghost
; use Ghost
;
43 with Inline
; use Inline
;
44 with Itypes
; use Itypes
;
45 with Lib
.Xref
; use Lib
.Xref
;
46 with Layout
; use Layout
;
47 with Namet
; use Namet
;
49 with Nlists
; use Nlists
;
50 with Nmake
; use Nmake
;
52 with Output
; use Output
;
53 with Restrict
; use Restrict
;
54 with Rident
; use Rident
;
55 with Rtsfind
; use Rtsfind
;
57 with Sem_Aux
; use Sem_Aux
;
58 with Sem_Cat
; use Sem_Cat
;
59 with Sem_Ch3
; use Sem_Ch3
;
60 with Sem_Ch4
; use Sem_Ch4
;
61 with Sem_Ch5
; use Sem_Ch5
;
62 with Sem_Ch8
; use Sem_Ch8
;
63 with Sem_Ch9
; use Sem_Ch9
;
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 Tbuild
; use Tbuild
;
87 with Uintp
; use Uintp
;
88 with Urealp
; use Urealp
;
89 with Validsw
; use Validsw
;
91 package body Sem_Ch6
is
93 May_Hide_Profile
: Boolean := False;
94 -- This flag is used to indicate that two formals in two subprograms being
95 -- checked for conformance differ only in that one is an access parameter
96 -- while the other is of a general access type with the same designated
97 -- type. In this case, if the rest of the signatures match, a call to
98 -- either subprogram may be ambiguous, which is worth a warning. The flag
99 -- is set in Compatible_Types, and the warning emitted in
100 -- New_Overloaded_Entity.
102 -----------------------
103 -- Local Subprograms --
104 -----------------------
106 procedure Analyze_Function_Return
(N
: Node_Id
);
107 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
108 -- applies to a [generic] function.
110 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
111 -- Analyze a generic subprogram body. N is the body to be analyzed, and
112 -- Gen_Id is the defining entity Id for the corresponding spec.
114 procedure Analyze_Null_Procedure
116 Is_Completion
: out Boolean);
117 -- A null procedure can be a declaration or (Ada 2012) a completion
119 procedure Analyze_Return_Statement
(N
: Node_Id
);
120 -- Common processing for simple and extended return statements
122 procedure Analyze_Return_Type
(N
: Node_Id
);
123 -- Subsidiary to Process_Formals: analyze subtype mark in function
124 -- specification in a context where the formals are visible and hide
127 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
128 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
129 -- that we can use RETURN but not skip the debug output at the end.
131 function Can_Override_Operator
(Subp
: Entity_Id
) return Boolean;
132 -- Returns true if Subp can override a predefined operator.
134 procedure Check_Conformance
137 Ctype
: Conformance_Type
;
139 Conforms
: out Boolean;
140 Err_Loc
: Node_Id
:= Empty
;
141 Get_Inst
: Boolean := False;
142 Skip_Controlling_Formals
: Boolean := False);
143 -- Given two entities, this procedure checks that the profiles associated
144 -- with these entities meet the conformance criterion given by the third
145 -- parameter. If they conform, Conforms is set True and control returns
146 -- to the caller. If they do not conform, Conforms is set to False, and
147 -- in addition, if Errmsg is True on the call, proper messages are output
148 -- to complain about the conformance failure. If Err_Loc is non_Empty
149 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
150 -- error messages are placed on the appropriate part of the construct
151 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
152 -- against a formal access-to-subprogram type so Get_Instance_Of must
155 procedure Check_Limited_Return
159 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning limited
160 -- types. Used only for simple return statements. Expr is the expression
163 procedure Check_Subprogram_Order
(N
: Node_Id
);
164 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
165 -- the alpha ordering rule for N if this ordering requirement applicable.
167 procedure Check_Returns
171 Proc
: Entity_Id
:= Empty
);
172 -- Called to check for missing return statements in a function body, or for
173 -- returns present in a procedure body which has No_Return set. HSS is the
174 -- handled statement sequence for the subprogram body. This procedure
175 -- checks all flow paths to make sure they either have return (Mode = 'F',
176 -- used for functions) or do not have a return (Mode = 'P', used for
177 -- No_Return procedures). The flag Err is set if there are any control
178 -- paths not explicitly terminated by a return in the function case, and is
179 -- True otherwise. Proc is the entity for the procedure case and is used
180 -- in posting the warning message.
182 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
183 -- In Ada 2012, a primitive equality operator on an untagged record type
184 -- must appear before the type is frozen, and have the same visibility as
185 -- that of the type. This procedure checks that this rule is met, and
186 -- otherwise emits an error on the subprogram declaration and a warning
187 -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode,
188 -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier
189 -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility
190 -- is set, otherwise the call has no effect.
192 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
193 -- This procedure makes S, a new overloaded entity, into the first visible
194 -- entity with that name.
196 function Is_Non_Overriding_Operation
198 New_E
: Entity_Id
) return Boolean;
199 -- Enforce the rule given in 12.3(18): a private operation in an instance
200 -- overrides an inherited operation only if the corresponding operation
201 -- was overriding in the generic. This needs to be checked for primitive
202 -- operations of types derived (in the generic unit) from formal private
203 -- or formal derived types.
205 procedure Make_Inequality_Operator
(S
: Entity_Id
);
206 -- Create the declaration for an inequality operator that is implicitly
207 -- created by a user-defined equality operator that yields a boolean.
209 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
210 -- Formal_Id is an formal parameter entity. This procedure deals with
211 -- setting the proper validity status for this entity, which depends on
212 -- the kind of parameter and the validity checking mode.
214 ---------------------------------------------
215 -- Analyze_Abstract_Subprogram_Declaration --
216 ---------------------------------------------
218 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
219 Scop
: constant Entity_Id
:= Current_Scope
;
220 Subp_Id
: constant Entity_Id
:=
221 Analyze_Subprogram_Specification
(Specification
(N
));
224 Check_SPARK_05_Restriction
("abstract subprogram is not allowed", N
);
226 Generate_Definition
(Subp_Id
);
228 -- Set the SPARK mode from the current context (may be overwritten later
229 -- with explicit pragma).
231 Set_SPARK_Pragma
(Subp_Id
, SPARK_Mode_Pragma
);
232 Set_SPARK_Pragma_Inherited
(Subp_Id
);
234 -- Preserve relevant elaboration-related attributes of the context which
235 -- are no longer available or very expensive to recompute once analysis,
236 -- resolution, and expansion are over.
238 Mark_Elaboration_Attributes
243 Set_Is_Abstract_Subprogram
(Subp_Id
);
244 New_Overloaded_Entity
(Subp_Id
);
245 Check_Delayed_Subprogram
(Subp_Id
);
247 Set_Categorization_From_Scope
(Subp_Id
, Scop
);
249 if Ekind
(Scope
(Subp_Id
)) = E_Protected_Type
then
250 Error_Msg_N
("abstract subprogram not allowed in protected type", N
);
252 -- Issue a warning if the abstract subprogram is neither a dispatching
253 -- operation nor an operation that overrides an inherited subprogram or
254 -- predefined operator, since this most likely indicates a mistake.
256 elsif Warn_On_Redundant_Constructs
257 and then not Is_Dispatching_Operation
(Subp_Id
)
258 and then not Present
(Overridden_Operation
(Subp_Id
))
259 and then (not Is_Operator_Symbol_Name
(Chars
(Subp_Id
))
260 or else Scop
/= Scope
(Etype
(First_Formal
(Subp_Id
))))
263 ("abstract subprogram is not dispatching or overriding?r?", N
);
266 Generate_Reference_To_Formals
(Subp_Id
);
267 Check_Eliminated
(Subp_Id
);
269 if Has_Aspects
(N
) then
270 Analyze_Aspect_Specifications
(N
, Subp_Id
);
272 end Analyze_Abstract_Subprogram_Declaration
;
274 ---------------------------------
275 -- Analyze_Expression_Function --
276 ---------------------------------
278 procedure Analyze_Expression_Function
(N
: Node_Id
) is
279 Expr
: constant Node_Id
:= Expression
(N
);
280 Loc
: constant Source_Ptr
:= Sloc
(N
);
281 LocX
: constant Source_Ptr
:= Sloc
(Expr
);
282 Spec
: constant Node_Id
:= Specification
(N
);
284 procedure Freeze_Expr_Types
(Def_Id
: Entity_Id
);
285 -- N is an expression function that is a completion and Def_Id its
286 -- defining entity. Freeze before N all the types referenced by the
287 -- expression of the function.
289 -----------------------
290 -- Freeze_Expr_Types --
291 -----------------------
293 procedure Freeze_Expr_Types
(Def_Id
: Entity_Id
) is
294 function Cloned_Expression
return Node_Id
;
295 -- Build a duplicate of the expression of the return statement that
296 -- has no defining entities shared with the original expression.
298 function Freeze_Type_Refs
(Node
: Node_Id
) return Traverse_Result
;
299 -- Freeze all types referenced in the subtree rooted at Node
301 -----------------------
302 -- Cloned_Expression --
303 -----------------------
305 function Cloned_Expression
return Node_Id
is
306 function Clone_Id
(Node
: Node_Id
) return Traverse_Result
;
307 -- Tree traversal routine that clones the defining identifier of
308 -- iterator and loop parameter specification nodes.
314 function Clone_Id
(Node
: Node_Id
) return Traverse_Result
is
316 if Nkind_In
(Node
, N_Iterator_Specification
,
317 N_Loop_Parameter_Specification
)
319 Set_Defining_Identifier
(Node
,
320 New_Copy
(Defining_Identifier
(Node
)));
326 procedure Clone_Def_Ids
is new Traverse_Proc
(Clone_Id
);
330 Dup_Expr
: constant Node_Id
:= New_Copy_Tree
(Expr
);
332 -- Start of processing for Cloned_Expression
335 -- We must duplicate the expression with semantic information to
336 -- inherit the decoration of global entities in generic instances.
337 -- Set the parent of the new node to be the parent of the original
338 -- to get the proper context, which is needed for complete error
339 -- reporting and for semantic analysis.
341 Set_Parent
(Dup_Expr
, Parent
(Expr
));
343 -- Replace the defining identifier of iterators and loop param
344 -- specifications by a clone to ensure that the cloned expression
345 -- and the original expression don't have shared identifiers;
346 -- otherwise, as part of the preanalysis of the expression, these
347 -- shared identifiers may be left decorated with itypes which
348 -- will not be available in the tree passed to the backend.
350 Clone_Def_Ids
(Dup_Expr
);
353 end Cloned_Expression
;
355 ----------------------
356 -- Freeze_Type_Refs --
357 ----------------------
359 function Freeze_Type_Refs
(Node
: Node_Id
) return Traverse_Result
is
360 procedure Check_And_Freeze_Type
(Typ
: Entity_Id
);
361 -- Check that Typ is fully declared and freeze it if so
363 ---------------------------
364 -- Check_And_Freeze_Type --
365 ---------------------------
367 procedure Check_And_Freeze_Type
(Typ
: Entity_Id
) is
369 -- Skip Itypes created by the preanalysis, and itypes whose
370 -- scope is another type (i.e. component subtypes that depend
371 -- on a discriminant),
374 and then (Scope_Within_Or_Same
(Scope
(Typ
), Def_Id
)
375 or else Is_Type
(Scope
(Typ
)))
380 -- This provides a better error message than generating
381 -- primitives whose compilation fails much later. Refine
382 -- the error message if possible.
384 Check_Fully_Declared
(Typ
, Node
);
386 if Error_Posted
(Node
) then
387 if Has_Private_Component
(Typ
)
388 and then not Is_Private_Type
(Typ
)
390 Error_Msg_NE
("\type& has private component", Node
, Typ
);
394 Freeze_Before
(N
, Typ
);
396 end Check_And_Freeze_Type
;
398 -- Start of processing for Freeze_Type_Refs
401 -- Check that a type referenced by an entity can be frozen
403 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
404 Check_And_Freeze_Type
(Etype
(Entity
(Node
)));
406 -- Check that the enclosing record type can be frozen
408 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
409 Check_And_Freeze_Type
(Scope
(Entity
(Node
)));
412 -- Freezing an access type does not freeze the designated type,
413 -- but freezing conversions between access to interfaces requires
414 -- that the interface types themselves be frozen, so that dispatch
415 -- table entities are properly created.
417 -- Unclear whether a more general rule is needed ???
419 elsif Nkind
(Node
) = N_Type_Conversion
420 and then Is_Access_Type
(Etype
(Node
))
421 and then Is_Interface
(Designated_Type
(Etype
(Node
)))
423 Check_And_Freeze_Type
(Designated_Type
(Etype
(Node
)));
426 -- An implicit dereference freezes the designated type. In the
427 -- case of a dispatching call whose controlling argument is an
428 -- access type, the dereference is not made explicit, so we must
429 -- check for such a call and freeze the designated type.
431 if Nkind
(Node
) in N_Has_Etype
432 and then Present
(Etype
(Node
))
433 and then Is_Access_Type
(Etype
(Node
))
434 and then Nkind
(Parent
(Node
)) = N_Function_Call
435 and then Node
= Controlling_Argument
(Parent
(Node
))
437 Check_And_Freeze_Type
(Designated_Type
(Etype
(Node
)));
440 -- No point in posting several errors on the same expression
442 if Serious_Errors_Detected
> 0 then
447 end Freeze_Type_Refs
;
449 procedure Freeze_References
is new Traverse_Proc
(Freeze_Type_Refs
);
453 Saved_First_Entity
: constant Entity_Id
:= First_Entity
(Def_Id
);
454 Saved_Last_Entity
: constant Entity_Id
:= Last_Entity
(Def_Id
);
455 Dup_Expr
: constant Node_Id
:= Cloned_Expression
;
457 -- Start of processing for Freeze_Expr_Types
460 -- Preanalyze a duplicate of the expression to have available the
461 -- minimum decoration needed to locate referenced unfrozen types
462 -- without adding any decoration to the function expression.
465 Install_Formals
(Def_Id
);
467 Preanalyze_Spec_Expression
(Dup_Expr
, Etype
(Def_Id
));
470 -- Restore certain attributes of Def_Id since the preanalysis may
471 -- have introduced itypes to this scope, thus modifying attributes
472 -- First_Entity and Last_Entity.
474 Set_First_Entity
(Def_Id
, Saved_First_Entity
);
475 Set_Last_Entity
(Def_Id
, Saved_Last_Entity
);
477 if Present
(Last_Entity
(Def_Id
)) then
478 Set_Next_Entity
(Last_Entity
(Def_Id
), Empty
);
481 -- Freeze all types referenced in the expression
483 Freeze_References
(Dup_Expr
);
484 end Freeze_Expr_Types
;
494 Def_Id
: Entity_Id
:= Empty
;
496 -- If the expression is a completion, Prev is the entity whose
497 -- declaration is completed. Def_Id is needed to analyze the spec.
499 -- Start of processing for Analyze_Expression_Function
502 -- This is one of the occasions on which we transform the tree during
503 -- semantic analysis. If this is a completion, transform the expression
504 -- function into an equivalent subprogram body, and analyze it.
506 -- Expression functions are inlined unconditionally. The back-end will
507 -- determine whether this is possible.
509 Inline_Processing_Required
:= True;
511 -- Create a specification for the generated body. This must be done
512 -- prior to the analysis of the initial declaration.
514 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
515 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
517 -- If there are previous overloadable entities with the same name,
518 -- check whether any of them is completed by the expression function.
519 -- In a generic context a formal subprogram has no completion.
522 and then Is_Overloadable
(Prev
)
523 and then not Is_Formal_Subprogram
(Prev
)
525 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
526 Prev
:= Find_Corresponding_Spec
(N
);
528 -- The previous entity may be an expression function as well, in
529 -- which case the redeclaration is illegal.
532 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
533 N_Expression_Function
535 Error_Msg_Sloc
:= Sloc
(Prev
);
536 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
541 Ret
:= Make_Simple_Return_Statement
(LocX
, Expr
);
544 Make_Subprogram_Body
(Loc
,
545 Specification
=> New_Spec
,
546 Declarations
=> Empty_List
,
547 Handled_Statement_Sequence
=>
548 Make_Handled_Sequence_Of_Statements
(LocX
,
549 Statements
=> New_List
(Ret
)));
550 Set_Was_Expression_Function
(New_Body
);
552 -- If the expression completes a generic subprogram, we must create a
553 -- separate node for the body, because at instantiation the original
554 -- node of the generic copy must be a generic subprogram body, and
555 -- cannot be a expression function. Otherwise we just rewrite the
556 -- expression with the non-generic body.
558 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
559 Insert_After
(N
, New_Body
);
561 -- Propagate any aspects or pragmas that apply to the expression
562 -- function to the proper body when the expression function acts
565 if Has_Aspects
(N
) then
566 Move_Aspects
(N
, To
=> New_Body
);
569 Relocate_Pragmas_To_Body
(New_Body
);
571 Rewrite
(N
, Make_Null_Statement
(Loc
));
572 Set_Has_Completion
(Prev
, False);
575 Set_Is_Inlined
(Prev
);
577 -- If the expression function is a completion, the previous declaration
578 -- must come from source. We know already that it appears in the current
579 -- scope. The entity itself may be internally created if within a body
583 and then Is_Overloadable
(Prev
)
584 and then not Is_Formal_Subprogram
(Prev
)
585 and then Comes_From_Source
(Parent
(Prev
))
587 Set_Has_Completion
(Prev
, False);
588 Set_Is_Inlined
(Prev
);
590 -- AI12-0103: Expression functions that are a completion freeze their
591 -- expression but don't freeze anything else (unlike regular bodies).
593 -- Note that we cannot defer this freezing to the analysis of the
594 -- expression itself, because a freeze node might appear in a nested
595 -- scope, leading to an elaboration order issue in gigi.
596 -- As elsewhere, we do not emit freeze nodes within a generic unit.
598 if not Inside_A_Generic
then
599 Freeze_Expr_Types
(Def_Id
);
602 -- For navigation purposes, indicate that the function is a body
604 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
605 Rewrite
(N
, New_Body
);
607 -- Remove any existing aspects from the original node because the act
608 -- of rewriting causes the list to be shared between the two nodes.
610 Orig_N
:= Original_Node
(N
);
611 Remove_Aspects
(Orig_N
);
613 -- Propagate any pragmas that apply to expression function to the
614 -- proper body when the expression function acts as a completion.
615 -- Aspects are automatically transfered because of node rewriting.
617 Relocate_Pragmas_To_Body
(N
);
620 -- Once the aspects of the generated body have been analyzed, create
621 -- a copy for ASIS purposes and associate it with the original node.
623 if Has_Aspects
(N
) then
624 Set_Aspect_Specifications
(Orig_N
,
625 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
628 -- Prev is the previous entity with the same name, but it is can
629 -- be an unrelated spec that is not completed by the expression
630 -- function. In that case the relevant entity is the one in the body.
631 -- Not clear that the backend can inline it in this case ???
633 if Has_Completion
(Prev
) then
635 -- The formals of the expression function are body formals,
636 -- and do not appear in the ali file, which will only contain
637 -- references to the formals of the original subprogram spec.
644 F1
:= First_Formal
(Def_Id
);
645 F2
:= First_Formal
(Prev
);
647 while Present
(F1
) loop
648 Set_Spec_Entity
(F1
, F2
);
655 Set_Is_Inlined
(Defining_Entity
(New_Body
));
658 -- If this is not a completion, create both a declaration and a body, so
659 -- that the expression can be inlined whenever possible.
662 -- An expression function that is not a completion is not a
663 -- subprogram declaration, and thus cannot appear in a protected
666 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
668 ("an expression function is not a legal protected operation", N
);
671 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
673 -- Remove any existing aspects from the original node because the act
674 -- of rewriting causes the list to be shared between the two nodes.
676 Orig_N
:= Original_Node
(N
);
677 Remove_Aspects
(Orig_N
);
681 -- Once the aspects of the generated spec have been analyzed, create
682 -- a copy for ASIS purposes and associate it with the original node.
684 if Has_Aspects
(N
) then
685 Set_Aspect_Specifications
(Orig_N
,
686 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
689 -- If aspect SPARK_Mode was specified on the body, it needs to be
690 -- repeated both on the generated spec and the body.
692 Asp
:= Find_Aspect
(Defining_Unit_Name
(Spec
), Aspect_SPARK_Mode
);
694 if Present
(Asp
) then
695 Asp
:= New_Copy_Tree
(Asp
);
696 Set_Analyzed
(Asp
, False);
697 Set_Aspect_Specifications
(New_Body
, New_List
(Asp
));
700 Def_Id
:= Defining_Entity
(N
);
701 Set_Is_Inlined
(Def_Id
);
703 -- Establish the linkages between the spec and the body. These are
704 -- used when the expression function acts as the prefix of attribute
705 -- 'Access in order to freeze the original expression which has been
706 -- moved to the generated body.
708 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
709 Set_Corresponding_Spec
(New_Body
, Def_Id
);
711 -- Within a generic pre-analyze the original expression for name
712 -- capture. The body is also generated but plays no role in
713 -- this because it is not part of the original source.
715 if Inside_A_Generic
then
716 Set_Has_Completion
(Def_Id
);
718 Install_Formals
(Def_Id
);
719 Preanalyze_Spec_Expression
(Expr
, Etype
(Def_Id
));
723 -- To prevent premature freeze action, insert the new body at the end
724 -- of the current declarations, or at the end of the package spec.
725 -- However, resolve usage names now, to prevent spurious visibility
726 -- on later entities. Note that the function can now be called in
727 -- the current declarative part, which will appear to be prior to
728 -- the presence of the body in the code. There are nevertheless no
729 -- order of elaboration issues because all name resolution has taken
730 -- place at the point of declaration.
733 Decls
: List_Id
:= List_Containing
(N
);
734 Expr
: constant Node_Id
:= Expression
(Ret
);
735 Par
: constant Node_Id
:= Parent
(Decls
);
736 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
739 -- If this is a wrapper created for in an instance for a formal
740 -- subprogram, insert body after declaration, to be analyzed when
741 -- the enclosing instance is analyzed.
744 and then Is_Generic_Actual_Subprogram
(Def_Id
)
746 Insert_After
(N
, New_Body
);
749 if Nkind
(Par
) = N_Package_Specification
750 and then Decls
= Visible_Declarations
(Par
)
751 and then Present
(Private_Declarations
(Par
))
752 and then not Is_Empty_List
(Private_Declarations
(Par
))
754 Decls
:= Private_Declarations
(Par
);
757 Insert_After
(Last
(Decls
), New_Body
);
759 -- Preanalyze the expression if not already done above
761 if not Inside_A_Generic
then
763 Install_Formals
(Def_Id
);
764 Preanalyze_Spec_Expression
(Expr
, Typ
);
765 Check_Limited_Return
(Original_Node
(N
), Expr
, Typ
);
772 -- Check incorrect use of dynamically tagged expression. This doesn't
773 -- fall out automatically when analyzing the generated function body,
774 -- because Check_Dynamically_Tagged_Expression deliberately ignores
775 -- nodes that don't come from source.
778 and then Nkind
(Def_Id
) in N_Has_Etype
779 and then Is_Tagged_Type
(Etype
(Def_Id
))
781 Check_Dynamically_Tagged_Expression
783 Typ
=> Etype
(Def_Id
),
784 Related_Nod
=> Original_Node
(N
));
787 -- We must enforce checks for unreferenced formals in our newly
788 -- generated function, so we propagate the referenced flag from the
789 -- original spec to the new spec as well as setting Comes_From_Source.
791 if Present
(Parameter_Specifications
(New_Spec
)) then
793 Form_New_Def
: Entity_Id
;
794 Form_New_Spec
: Entity_Id
;
795 Form_Old_Def
: Entity_Id
;
796 Form_Old_Spec
: Entity_Id
;
799 Form_New_Spec
:= First
(Parameter_Specifications
(New_Spec
));
800 Form_Old_Spec
:= First
(Parameter_Specifications
(Spec
));
802 while Present
(Form_New_Spec
) and then Present
(Form_Old_Spec
) loop
803 Form_New_Def
:= Defining_Identifier
(Form_New_Spec
);
804 Form_Old_Def
:= Defining_Identifier
(Form_Old_Spec
);
806 Set_Comes_From_Source
(Form_New_Def
, True);
808 -- Because of the usefulness of unreferenced controlling
809 -- formals we exempt them from unreferenced warnings by marking
810 -- them as always referenced.
814 (Is_Formal
(Form_Old_Def
)
815 and then Is_Controlling_Formal
(Form_Old_Def
))
816 or else Referenced
(Form_Old_Def
));
817 -- or else Is_Dispatching_Operation
818 -- (Corresponding_Spec (New_Body)));
820 Next
(Form_New_Spec
);
821 Next
(Form_Old_Spec
);
825 end Analyze_Expression_Function
;
827 ----------------------------------------
828 -- Analyze_Extended_Return_Statement --
829 ----------------------------------------
831 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
833 Check_Compiler_Unit
("extended return statement", N
);
834 Analyze_Return_Statement
(N
);
835 end Analyze_Extended_Return_Statement
;
837 ----------------------------
838 -- Analyze_Function_Call --
839 ----------------------------
841 procedure Analyze_Function_Call
(N
: Node_Id
) is
842 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
843 Func_Nam
: constant Node_Id
:= Name
(N
);
849 -- A call of the form A.B (X) may be an Ada 2005 call, which is
850 -- rewritten as B (A, X). If the rewriting is successful, the call
851 -- has been analyzed and we just return.
853 if Nkind
(Func_Nam
) = N_Selected_Component
854 and then Name
(N
) /= Func_Nam
855 and then Is_Rewrite_Substitution
(N
)
856 and then Present
(Etype
(N
))
861 -- If error analyzing name, then set Any_Type as result type and return
863 if Etype
(Func_Nam
) = Any_Type
then
864 Set_Etype
(N
, Any_Type
);
868 -- Otherwise analyze the parameters
870 if Present
(Actuals
) then
871 Actual
:= First
(Actuals
);
872 while Present
(Actual
) loop
874 Check_Parameterless_Call
(Actual
);
880 end Analyze_Function_Call
;
882 -----------------------------
883 -- Analyze_Function_Return --
884 -----------------------------
886 procedure Analyze_Function_Return
(N
: Node_Id
) is
887 Loc
: constant Source_Ptr
:= Sloc
(N
);
888 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
889 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
891 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
892 -- Function result subtype
894 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
);
895 -- Apply legality rule of 6.5 (5.8) to the access discriminants of an
896 -- aggregate in a return statement.
898 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
899 -- Check that the return_subtype_indication properly matches the result
900 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
902 -----------------------------------
903 -- Check_Aggregate_Accessibility --
904 -----------------------------------
906 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
) is
907 Typ
: constant Entity_Id
:= Etype
(Aggr
);
914 if Is_Record_Type
(Typ
) and then Has_Discriminants
(Typ
) then
915 Discr
:= First_Discriminant
(Typ
);
916 Assoc
:= First
(Component_Associations
(Aggr
));
917 while Present
(Discr
) loop
918 if Ekind
(Etype
(Discr
)) = E_Anonymous_Access_Type
then
919 Expr
:= Expression
(Assoc
);
921 if Nkind
(Expr
) = N_Attribute_Reference
922 and then Attribute_Name
(Expr
) /= Name_Unrestricted_Access
924 Obj
:= Prefix
(Expr
);
925 while Nkind_In
(Obj
, N_Indexed_Component
,
926 N_Selected_Component
)
931 -- Do not check aliased formals or function calls. A
932 -- run-time check may still be needed ???
934 if Is_Entity_Name
(Obj
)
935 and then Comes_From_Source
(Obj
)
937 if Is_Formal
(Entity
(Obj
))
938 and then Is_Aliased
(Entity
(Obj
))
942 elsif Object_Access_Level
(Obj
) >
943 Scope_Depth
(Scope
(Scope_Id
))
946 ("access discriminant in return aggregate would "
947 & "be a dangling reference", Obj
);
953 Next_Discriminant
(Discr
);
956 end Check_Aggregate_Accessibility
;
958 -------------------------------------
959 -- Check_Return_Subtype_Indication --
960 -------------------------------------
962 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
963 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
965 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
966 -- Subtype given in the extended return statement (must match R_Type)
968 Subtype_Ind
: constant Node_Id
:=
969 Object_Definition
(Original_Node
(Obj_Decl
));
971 procedure Error_No_Match
(N
: Node_Id
);
972 -- Output error messages for case where types do not statically
973 -- match. N is the location for the messages.
979 procedure Error_No_Match
(N
: Node_Id
) is
982 ("subtype must statically match function result subtype", N
);
984 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
985 Error_Msg_Node_2
:= R_Type
;
987 ("\predicate of& does not match predicate of&",
992 -- Start of processing for Check_Return_Subtype_Indication
995 -- First, avoid cascaded errors
997 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
1001 -- "return access T" case; check that the return statement also has
1002 -- "access T", and that the subtypes statically match:
1003 -- if this is an access to subprogram the signatures must match.
1005 if Is_Anonymous_Access_Type
(R_Type
) then
1006 if Is_Anonymous_Access_Type
(R_Stm_Type
) then
1007 if Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
1009 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
1010 Base_Type
(Designated_Type
(R_Type
))
1011 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
1013 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
1017 -- For two anonymous access to subprogram types, the types
1018 -- themselves must be type conformant.
1020 if not Conforming_Types
1021 (R_Stm_Type
, R_Type
, Fully_Conformant
)
1023 Error_No_Match
(Subtype_Ind
);
1028 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
1031 -- If the return object is of an anonymous access type, then report
1032 -- an error if the function's result type is not also anonymous.
1034 elsif Is_Anonymous_Access_Type
(R_Stm_Type
) then
1035 pragma Assert
(not Is_Anonymous_Access_Type
(R_Type
));
1037 ("anonymous access not allowed for function with named access "
1038 & "result", Subtype_Ind
);
1040 -- Subtype indication case: check that the return object's type is
1041 -- covered by the result type, and that the subtypes statically match
1042 -- when the result subtype is constrained. Also handle record types
1043 -- with unknown discriminants for which we have built the underlying
1044 -- record view. Coverage is needed to allow specific-type return
1045 -- objects when the result type is class-wide (see AI05-32).
1047 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
1048 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
1051 (Base_Type
(R_Type
),
1052 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
1054 -- A null exclusion may be present on the return type, on the
1055 -- function specification, on the object declaration or on the
1058 if Is_Access_Type
(R_Type
)
1060 (Can_Never_Be_Null
(R_Type
)
1061 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
1062 Can_Never_Be_Null
(R_Stm_Type
)
1064 Error_No_Match
(Subtype_Ind
);
1067 -- AI05-103: for elementary types, subtypes must statically match
1069 if Is_Constrained
(R_Type
) or else Is_Access_Type
(R_Type
) then
1070 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
1071 Error_No_Match
(Subtype_Ind
);
1075 -- All remaining cases are illegal
1077 -- Note: previous versions of this subprogram allowed the return
1078 -- value to be the ancestor of the return type if the return type
1079 -- was a null extension. This was plainly incorrect.
1083 ("wrong type for return_subtype_indication", Subtype_Ind
);
1085 end Check_Return_Subtype_Indication
;
1087 ---------------------
1088 -- Local Variables --
1089 ---------------------
1092 Obj_Decl
: Node_Id
:= Empty
;
1094 -- Start of processing for Analyze_Function_Return
1097 Set_Return_Present
(Scope_Id
);
1099 if Nkind
(N
) = N_Simple_Return_Statement
then
1100 Expr
:= Expression
(N
);
1102 -- Guard against a malformed expression. The parser may have tried to
1103 -- recover but the node is not analyzable.
1105 if Nkind
(Expr
) = N_Error
then
1106 Set_Etype
(Expr
, Any_Type
);
1107 Expander_Mode_Save_And_Set
(False);
1111 -- The resolution of a controlled [extension] aggregate associated
1112 -- with a return statement creates a temporary which needs to be
1113 -- finalized on function exit. Wrap the return statement inside a
1114 -- block so that the finalization machinery can detect this case.
1115 -- This early expansion is done only when the return statement is
1116 -- not part of a handled sequence of statements.
1118 if Nkind_In
(Expr
, N_Aggregate
,
1119 N_Extension_Aggregate
)
1120 and then Needs_Finalization
(R_Type
)
1121 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1124 Make_Block_Statement
(Loc
,
1125 Handled_Statement_Sequence
=>
1126 Make_Handled_Sequence_Of_Statements
(Loc
,
1127 Statements
=> New_List
(Relocate_Node
(N
)))));
1135 -- Ada 2005 (AI-251): If the type of the returned object is
1136 -- an access to an interface type then we add an implicit type
1137 -- conversion to force the displacement of the "this" pointer to
1138 -- reference the secondary dispatch table. We cannot delay the
1139 -- generation of this implicit conversion until the expansion
1140 -- because in this case the type resolution changes the decoration
1141 -- of the expression node to match R_Type; by contrast, if the
1142 -- returned object is a class-wide interface type then it is too
1143 -- early to generate here the implicit conversion since the return
1144 -- statement may be rewritten by the expander into an extended
1145 -- return statement whose expansion takes care of adding the
1146 -- implicit type conversion to displace the pointer to the object.
1149 and then Serious_Errors_Detected
= 0
1150 and then Is_Access_Type
(R_Type
)
1151 and then not Nkind_In
(Expr
, N_Null
, N_Raise_Expression
)
1152 and then Is_Interface
(Designated_Type
(R_Type
))
1153 and then Is_Progenitor
(Designated_Type
(R_Type
),
1154 Designated_Type
(Etype
(Expr
)))
1156 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1160 Resolve
(Expr
, R_Type
);
1161 Check_Limited_Return
(N
, Expr
, R_Type
);
1163 if Present
(Expr
) and then Nkind
(Expr
) = N_Aggregate
then
1164 Check_Aggregate_Accessibility
(Expr
);
1168 -- RETURN only allowed in SPARK as the last statement in function
1170 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1172 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
1173 or else Present
(Next
(N
)))
1175 Check_SPARK_05_Restriction
1176 ("RETURN should be the last statement in function", N
);
1180 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
1181 Obj_Decl
:= Last
(Return_Object_Declarations
(N
));
1183 -- Analyze parts specific to extended_return_statement:
1186 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
1187 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
1190 Expr
:= Expression
(Obj_Decl
);
1192 -- Note: The check for OK_For_Limited_Init will happen in
1193 -- Analyze_Object_Declaration; we treat it as a normal
1194 -- object declaration.
1196 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
1199 Check_Return_Subtype_Indication
(Obj_Decl
);
1201 if Present
(HSS
) then
1204 if Present
(Exception_Handlers
(HSS
)) then
1206 -- ???Has_Nested_Block_With_Handler needs to be set.
1207 -- Probably by creating an actual N_Block_Statement.
1208 -- Probably in Expand.
1214 -- Mark the return object as referenced, since the return is an
1215 -- implicit reference of the object.
1217 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
1219 Check_References
(Stm_Entity
);
1221 -- Check RM 6.5 (5.9/3)
1224 if Ada_Version
< Ada_2012
then
1226 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
1227 -- Can it really happen (extended return???)
1230 ("aliased only allowed for limited return objects "
1231 & "in Ada 2012??", N
);
1233 elsif not Is_Limited_View
(R_Type
) then
1235 ("aliased only allowed for limited return objects", N
);
1241 -- Case of Expr present
1243 if Present
(Expr
) then
1245 -- Defend against previous errors
1247 if Nkind
(Expr
) = N_Empty
1248 or else No
(Etype
(Expr
))
1253 -- Apply constraint check. Note that this is done before the implicit
1254 -- conversion of the expression done for anonymous access types to
1255 -- ensure correct generation of the null-excluding check associated
1256 -- with null-excluding expressions found in return statements.
1258 Apply_Constraint_Check
(Expr
, R_Type
);
1260 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1261 -- type, apply an implicit conversion of the expression to that type
1262 -- to force appropriate static and run-time accessibility checks.
1264 if Ada_Version
>= Ada_2005
1265 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1267 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1268 Analyze_And_Resolve
(Expr
, R_Type
);
1270 -- If this is a local anonymous access to subprogram, the
1271 -- accessibility check can be applied statically. The return is
1272 -- illegal if the access type of the return expression is declared
1273 -- inside of the subprogram (except if it is the subtype indication
1274 -- of an extended return statement).
1276 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1277 if not Comes_From_Source
(Current_Scope
)
1278 or else Ekind
(Current_Scope
) = E_Return_Statement
1283 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1285 Error_Msg_N
("cannot return local access to subprogram", N
);
1288 -- The expression cannot be of a formal incomplete type
1290 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1291 and then Is_Generic_Type
(Etype
(Expr
))
1294 ("cannot return expression of a formal incomplete type", N
);
1297 -- If the result type is class-wide, then check that the return
1298 -- expression's type is not declared at a deeper level than the
1299 -- function (RM05-6.5(5.6/2)).
1301 if Ada_Version
>= Ada_2005
1302 and then Is_Class_Wide_Type
(R_Type
)
1304 if Type_Access_Level
(Etype
(Expr
)) >
1305 Subprogram_Access_Level
(Scope_Id
)
1308 ("level of return expression type is deeper than "
1309 & "class-wide function!", Expr
);
1313 -- Check incorrect use of dynamically tagged expression
1315 if Is_Tagged_Type
(R_Type
) then
1316 Check_Dynamically_Tagged_Expression
1322 -- ??? A real run-time accessibility check is needed in cases
1323 -- involving dereferences of access parameters. For now we just
1324 -- check the static cases.
1326 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1327 and then Is_Limited_View
(Etype
(Scope_Id
))
1328 and then Object_Access_Level
(Expr
) >
1329 Subprogram_Access_Level
(Scope_Id
)
1331 -- Suppress the message in a generic, where the rewriting
1334 if Inside_A_Generic
then
1339 Make_Raise_Program_Error
(Loc
,
1340 Reason
=> PE_Accessibility_Check_Failed
));
1343 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1344 Error_Msg_N
("cannot return a local value by reference<<", N
);
1345 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1349 if Known_Null
(Expr
)
1350 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1351 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1353 Apply_Compile_Time_Constraint_Error
1355 Msg
=> "(Ada 2005) null not allowed for "
1356 & "null-excluding return??",
1357 Reason
=> CE_Null_Not_Allowed
);
1360 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1361 -- has no initializing expression.
1363 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1364 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1365 Subprogram_Access_Level
(Scope_Id
)
1368 ("level of return expression type is deeper than "
1369 & "class-wide function!", Obj_Decl
);
1372 end Analyze_Function_Return
;
1374 -------------------------------------
1375 -- Analyze_Generic_Subprogram_Body --
1376 -------------------------------------
1378 procedure Analyze_Generic_Subprogram_Body
1382 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1383 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1384 Body_Id
: Entity_Id
;
1389 -- Copy body and disable expansion while analyzing the generic For a
1390 -- stub, do not copy the stub (which would load the proper body), this
1391 -- will be done when the proper body is analyzed.
1393 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1394 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1397 -- Once the contents of the generic copy and the template are
1398 -- swapped, do the same for their respective aspect specifications.
1400 Exchange_Aspects
(N
, New_N
);
1402 -- Collect all contract-related source pragmas found within the
1403 -- template and attach them to the contract of the subprogram body.
1404 -- This contract is used in the capture of global references within
1407 Create_Generic_Contract
(N
);
1412 Spec
:= Specification
(N
);
1414 -- Within the body of the generic, the subprogram is callable, and
1415 -- behaves like the corresponding non-generic unit.
1417 Body_Id
:= Defining_Entity
(Spec
);
1419 if Kind
= E_Generic_Procedure
1420 and then Nkind
(Spec
) /= N_Procedure_Specification
1422 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1425 elsif Kind
= E_Generic_Function
1426 and then Nkind
(Spec
) /= N_Function_Specification
1428 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1432 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1434 if Has_Completion
(Gen_Id
)
1435 and then Nkind
(Parent
(N
)) /= N_Subunit
1437 Error_Msg_N
("duplicate generic body", N
);
1440 Set_Has_Completion
(Gen_Id
);
1443 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1444 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1446 Set_Corresponding_Spec
(N
, Gen_Id
);
1449 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1450 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1453 -- Make generic parameters immediately visible in the body. They are
1454 -- needed to process the formals declarations. Then make the formals
1455 -- visible in a separate step.
1457 Push_Scope
(Gen_Id
);
1461 First_Ent
: Entity_Id
;
1464 First_Ent
:= First_Entity
(Gen_Id
);
1467 while Present
(E
) and then not Is_Formal
(E
) loop
1472 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1474 -- Now generic formals are visible, and the specification can be
1475 -- analyzed, for subsequent conformance check.
1477 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1479 -- Make formal parameters visible
1483 -- E is the first formal parameter, we loop through the formals
1484 -- installing them so that they will be visible.
1486 Set_First_Entity
(Gen_Id
, E
);
1487 while Present
(E
) loop
1493 -- Visible generic entity is callable within its own body
1495 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1496 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1497 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1498 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1499 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1501 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1503 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1505 -- No body to analyze, so restore state of generic unit
1507 Set_Ekind
(Gen_Id
, Kind
);
1508 Set_Ekind
(Body_Id
, Kind
);
1510 if Present
(First_Ent
) then
1511 Set_First_Entity
(Gen_Id
, First_Ent
);
1518 -- If this is a compilation unit, it must be made visible explicitly,
1519 -- because the compilation of the declaration, unlike other library
1520 -- unit declarations, does not. If it is not a unit, the following
1521 -- is redundant but harmless.
1523 Set_Is_Immediately_Visible
(Gen_Id
);
1524 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1526 if Is_Child_Unit
(Gen_Id
) then
1527 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1530 Set_Actual_Subtypes
(N
, Current_Scope
);
1532 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1533 Set_SPARK_Pragma_Inherited
(Body_Id
);
1535 -- Analyze any aspect specifications that appear on the generic
1538 if Has_Aspects
(N
) then
1539 Analyze_Aspects_On_Subprogram_Body_Or_Stub
(N
);
1542 Analyze_Declarations
(Declarations
(N
));
1545 -- Process the contract of the subprogram body after all declarations
1546 -- have been analyzed. This ensures that any contract-related pragmas
1547 -- are available through the N_Contract node of the body.
1549 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
1551 Analyze
(Handled_Statement_Sequence
(N
));
1552 Save_Global_References
(Original_Node
(N
));
1554 -- Prior to exiting the scope, include generic formals again (if any
1555 -- are present) in the set of local entities.
1557 if Present
(First_Ent
) then
1558 Set_First_Entity
(Gen_Id
, First_Ent
);
1561 Check_References
(Gen_Id
);
1564 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1565 Update_Use_Clause_Chain
;
1566 Validate_Categorization_Dependency
(N
, Gen_Id
);
1568 Check_Subprogram_Order
(N
);
1570 -- Outside of its body, unit is generic again
1572 Set_Ekind
(Gen_Id
, Kind
);
1573 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1576 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1580 end Analyze_Generic_Subprogram_Body
;
1582 ----------------------------
1583 -- Analyze_Null_Procedure --
1584 ----------------------------
1586 procedure Analyze_Null_Procedure
1588 Is_Completion
: out Boolean)
1590 Loc
: constant Source_Ptr
:= Sloc
(N
);
1591 Spec
: constant Node_Id
:= Specification
(N
);
1592 Designator
: Entity_Id
;
1594 Null_Body
: Node_Id
:= Empty
;
1595 Null_Stmt
: Node_Id
:= Null_Statement
(Spec
);
1599 -- Capture the profile of the null procedure before analysis, for
1600 -- expansion at the freeze point and at each point of call. The body is
1601 -- used if the procedure has preconditions, or if it is a completion. In
1602 -- the first case the body is analyzed at the freeze point, in the other
1603 -- it replaces the null procedure declaration.
1605 -- For a null procedure that comes from source, a NULL statement is
1606 -- provided by the parser, which carries the source location of the
1607 -- NULL keyword, and has Comes_From_Source set. For a null procedure
1608 -- from expansion, create one now.
1610 if No
(Null_Stmt
) then
1611 Null_Stmt
:= Make_Null_Statement
(Loc
);
1615 Make_Subprogram_Body
(Loc
,
1616 Specification
=> New_Copy_Tree
(Spec
),
1617 Declarations
=> New_List
,
1618 Handled_Statement_Sequence
=>
1619 Make_Handled_Sequence_Of_Statements
(Loc
,
1620 Statements
=> New_List
(Null_Stmt
)));
1622 -- Create new entities for body and formals
1624 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1625 Make_Defining_Identifier
1626 (Sloc
(Defining_Entity
(N
)),
1627 Chars
(Defining_Entity
(N
))));
1629 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1630 while Present
(Form
) loop
1631 Set_Defining_Identifier
(Form
,
1632 Make_Defining_Identifier
1633 (Sloc
(Defining_Identifier
(Form
)),
1634 Chars
(Defining_Identifier
(Form
))));
1638 -- Determine whether the null procedure may be a completion of a generic
1639 -- suprogram, in which case we use the new null body as the completion
1640 -- and set minimal semantic information on the original declaration,
1641 -- which is rewritten as a null statement.
1643 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1645 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1646 Insert_Before
(N
, Null_Body
);
1647 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1649 Rewrite
(N
, Make_Null_Statement
(Loc
));
1650 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1651 Is_Completion
:= True;
1655 -- Resolve the types of the formals now, because the freeze point may
1656 -- appear in a different context, e.g. an instantiation.
1658 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1659 while Present
(Form
) loop
1660 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1661 Find_Type
(Parameter_Type
(Form
));
1663 elsif No
(Access_To_Subprogram_Definition
1664 (Parameter_Type
(Form
)))
1666 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1668 -- The case of a null procedure with a formal that is an
1669 -- access-to-subprogram type, and that is used as an actual
1670 -- in an instantiation is left to the enthusiastic reader.
1680 -- If there are previous overloadable entities with the same name, check
1681 -- whether any of them is completed by the null procedure.
1683 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1684 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1685 Prev
:= Find_Corresponding_Spec
(N
);
1688 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1689 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1690 Set_Has_Completion
(Designator
);
1692 -- Signal to caller that this is a procedure declaration
1694 Is_Completion
:= False;
1696 -- Null procedures are always inlined, but generic formal subprograms
1697 -- which appear as such in the internal instance of formal packages,
1698 -- need no completion and are not marked Inline.
1701 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1703 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1704 Set_Body_To_Inline
(N
, Null_Body
);
1705 Set_Is_Inlined
(Designator
);
1709 -- The null procedure is a completion. We unconditionally rewrite
1710 -- this as a null body (even if expansion is not active), because
1711 -- there are various error checks that are applied on this body
1712 -- when it is analyzed (e.g. correct aspect placement).
1714 if Has_Completion
(Prev
) then
1715 Error_Msg_Sloc
:= Sloc
(Prev
);
1716 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1719 Check_Previous_Null_Procedure
(N
, Prev
);
1721 Is_Completion
:= True;
1722 Rewrite
(N
, Null_Body
);
1725 end Analyze_Null_Procedure
;
1727 -----------------------------
1728 -- Analyze_Operator_Symbol --
1729 -----------------------------
1731 -- An operator symbol such as "+" or "and" may appear in context where the
1732 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1733 -- is just a string, as in (conjunction = "or"). In these cases the parser
1734 -- generates this node, and the semantics does the disambiguation. Other
1735 -- such case are actuals in an instantiation, the generic unit in an
1736 -- instantiation, and pragma arguments.
1738 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1739 Par
: constant Node_Id
:= Parent
(N
);
1742 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1743 or else Nkind
(Par
) = N_Function_Instantiation
1744 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1745 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1746 and then not Is_Pragma_String_Literal
(Par
))
1747 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1748 or else (Nkind
(Par
) = N_Attribute_Reference
1749 and then Attribute_Name
(Par
) /= Name_Value
)
1751 Find_Direct_Name
(N
);
1754 Change_Operator_Symbol_To_String_Literal
(N
);
1757 end Analyze_Operator_Symbol
;
1759 -----------------------------------
1760 -- Analyze_Parameter_Association --
1761 -----------------------------------
1763 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1765 Analyze
(Explicit_Actual_Parameter
(N
));
1766 end Analyze_Parameter_Association
;
1768 ----------------------------
1769 -- Analyze_Procedure_Call --
1770 ----------------------------
1772 -- WARNING: This routine manages Ghost regions. Return statements must be
1773 -- replaced by gotos which jump to the end of the routine and restore the
1776 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1777 procedure Analyze_Call_And_Resolve
;
1778 -- Do Analyze and Resolve calls for procedure call. At the end, check
1779 -- for illegal order dependence.
1780 -- ??? where is the check for illegal order dependencies?
1782 ------------------------------
1783 -- Analyze_Call_And_Resolve --
1784 ------------------------------
1786 procedure Analyze_Call_And_Resolve
is
1788 if Nkind
(N
) = N_Procedure_Call_Statement
then
1790 Resolve
(N
, Standard_Void_Type
);
1794 end Analyze_Call_And_Resolve
;
1798 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1799 Loc
: constant Source_Ptr
:= Sloc
(N
);
1800 P
: constant Node_Id
:= Name
(N
);
1802 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1803 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
1804 -- Save the Ghost-related attributes to restore on exit
1809 -- Start of processing for Analyze_Procedure_Call
1812 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1813 -- a procedure call or an entry call. The prefix may denote an access
1814 -- to subprogram type, in which case an implicit dereference applies.
1815 -- If the prefix is an indexed component (without implicit dereference)
1816 -- then the construct denotes a call to a member of an entire family.
1817 -- If the prefix is a simple name, it may still denote a call to a
1818 -- parameterless member of an entry family. Resolution of these various
1819 -- interpretations is delicate.
1821 -- Do not analyze machine code statements to avoid rejecting them in
1824 if CodePeer_Mode
and then Nkind
(P
) = N_Qualified_Expression
then
1825 Set_Etype
(P
, Standard_Void_Type
);
1830 -- If this is a call of the form Obj.Op, the call may have been analyzed
1831 -- and possibly rewritten into a block, in which case we are done.
1833 if Analyzed
(N
) then
1836 -- If there is an error analyzing the name (which may have been
1837 -- rewritten if the original call was in prefix notation) then error
1838 -- has been emitted already, mark node and return.
1840 elsif Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1841 Set_Etype
(N
, Any_Type
);
1845 -- A procedure call is Ghost when its name denotes a Ghost procedure.
1846 -- Set the mode now to ensure that any nodes generated during analysis
1847 -- and expansion are properly marked as Ghost.
1849 Mark_And_Set_Ghost_Procedure_Call
(N
);
1851 -- Otherwise analyze the parameters
1853 if Present
(Actuals
) then
1854 Actual
:= First
(Actuals
);
1856 while Present
(Actual
) loop
1858 Check_Parameterless_Call
(Actual
);
1863 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1865 if Nkind
(P
) = N_Attribute_Reference
1866 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1868 Name_Elab_Subp_Body
)
1870 if Present
(Actuals
) then
1872 ("no parameters allowed for this call", First
(Actuals
));
1876 Set_Etype
(N
, Standard_Void_Type
);
1879 elsif Is_Entity_Name
(P
)
1880 and then Is_Record_Type
(Etype
(Entity
(P
)))
1881 and then Remote_AST_I_Dereference
(P
)
1885 elsif Is_Entity_Name
(P
)
1886 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1888 if Is_Access_Type
(Etype
(P
))
1889 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1890 and then No
(Actuals
)
1891 and then Comes_From_Source
(N
)
1893 Error_Msg_N
("missing explicit dereference in call", N
);
1896 Analyze_Call_And_Resolve
;
1898 -- If the prefix is the simple name of an entry family, this is a
1899 -- parameterless call from within the task body itself.
1901 elsif Is_Entity_Name
(P
)
1902 and then Nkind
(P
) = N_Identifier
1903 and then Ekind
(Entity
(P
)) = E_Entry_Family
1904 and then Present
(Actuals
)
1905 and then No
(Next
(First
(Actuals
)))
1907 -- Can be call to parameterless entry family. What appears to be the
1908 -- sole argument is in fact the entry index. Rewrite prefix of node
1909 -- accordingly. Source representation is unchanged by this
1913 Make_Indexed_Component
(Loc
,
1915 Make_Selected_Component
(Loc
,
1916 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1917 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1918 Expressions
=> Actuals
);
1919 Set_Name
(N
, New_N
);
1920 Set_Etype
(New_N
, Standard_Void_Type
);
1921 Set_Parameter_Associations
(N
, No_List
);
1922 Analyze_Call_And_Resolve
;
1924 elsif Nkind
(P
) = N_Explicit_Dereference
then
1925 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1926 Analyze_Call_And_Resolve
;
1928 Error_Msg_N
("expect access to procedure in call", P
);
1931 -- The name can be a selected component or an indexed component that
1932 -- yields an access to subprogram. Such a prefix is legal if the call
1933 -- has parameter associations.
1935 elsif Is_Access_Type
(Etype
(P
))
1936 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1938 if Present
(Actuals
) then
1939 Analyze_Call_And_Resolve
;
1941 Error_Msg_N
("missing explicit dereference in call ", N
);
1944 -- If not an access to subprogram, then the prefix must resolve to the
1945 -- name of an entry, entry family, or protected operation.
1947 -- For the case of a simple entry call, P is a selected component where
1948 -- the prefix is the task and the selector name is the entry. A call to
1949 -- a protected procedure will have the same syntax. If the protected
1950 -- object contains overloaded operations, the entity may appear as a
1951 -- function, the context will select the operation whose type is Void.
1953 elsif Nkind
(P
) = N_Selected_Component
1954 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1958 -- When front-end inlining is enabled, as with SPARK_Mode, a call
1959 -- in prefix notation may still be missing its controlling argument,
1960 -- so perform the transformation now.
1962 if SPARK_Mode
= On
and then In_Inlined_Body
then
1964 Subp
: constant Entity_Id
:= Entity
(Selector_Name
(P
));
1965 Typ
: constant Entity_Id
:= Etype
(Prefix
(P
));
1968 if Is_Tagged_Type
(Typ
)
1969 and then Present
(First_Formal
(Subp
))
1970 and then (Etype
(First_Formal
(Subp
)) = Typ
1972 Class_Wide_Type
(Etype
(First_Formal
(Subp
))) = Typ
)
1973 and then Try_Object_Operation
(P
)
1978 Analyze_Call_And_Resolve
;
1983 Analyze_Call_And_Resolve
;
1986 elsif Nkind
(P
) = N_Selected_Component
1987 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1988 and then Present
(Actuals
)
1989 and then No
(Next
(First
(Actuals
)))
1991 -- Can be call to parameterless entry family. What appears to be the
1992 -- sole argument is in fact the entry index. Rewrite prefix of node
1993 -- accordingly. Source representation is unchanged by this
1997 Make_Indexed_Component
(Loc
,
1998 Prefix
=> New_Copy
(P
),
1999 Expressions
=> Actuals
);
2000 Set_Name
(N
, New_N
);
2001 Set_Etype
(New_N
, Standard_Void_Type
);
2002 Set_Parameter_Associations
(N
, No_List
);
2003 Analyze_Call_And_Resolve
;
2005 -- For the case of a reference to an element of an entry family, P is
2006 -- an indexed component whose prefix is a selected component (task and
2007 -- entry family), and whose index is the entry family index.
2009 elsif Nkind
(P
) = N_Indexed_Component
2010 and then Nkind
(Prefix
(P
)) = N_Selected_Component
2011 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
2013 Analyze_Call_And_Resolve
;
2015 -- If the prefix is the name of an entry family, it is a call from
2016 -- within the task body itself.
2018 elsif Nkind
(P
) = N_Indexed_Component
2019 and then Nkind
(Prefix
(P
)) = N_Identifier
2020 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
2023 Make_Selected_Component
(Loc
,
2025 New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
2026 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
2027 Rewrite
(Prefix
(P
), New_N
);
2029 Analyze_Call_And_Resolve
;
2031 -- In Ada 2012. a qualified expression is a name, but it cannot be a
2032 -- procedure name, so the construct can only be a qualified expression.
2034 elsif Nkind
(P
) = N_Qualified_Expression
2035 and then Ada_Version
>= Ada_2012
2037 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
2040 -- Anything else is an error
2043 Error_Msg_N
("invalid procedure or entry call", N
);
2047 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
2048 end Analyze_Procedure_Call
;
2050 ------------------------------
2051 -- Analyze_Return_Statement --
2052 ------------------------------
2054 procedure Analyze_Return_Statement
(N
: Node_Id
) is
2055 pragma Assert
(Nkind_In
(N
, N_Extended_Return_Statement
,
2056 N_Simple_Return_Statement
));
2058 Returns_Object
: constant Boolean :=
2059 Nkind
(N
) = N_Extended_Return_Statement
2061 (Nkind
(N
) = N_Simple_Return_Statement
2062 and then Present
(Expression
(N
)));
2063 -- True if we're returning something; that is, "return <expression>;"
2064 -- or "return Result : T [:= ...]". False for "return;". Used for error
2065 -- checking: If Returns_Object is True, N should apply to a function
2066 -- body; otherwise N should apply to a procedure body, entry body,
2067 -- accept statement, or extended return statement.
2069 function Find_What_It_Applies_To
return Entity_Id
;
2070 -- Find the entity representing the innermost enclosing body, accept
2071 -- statement, or extended return statement. If the result is a callable
2072 -- construct or extended return statement, then this will be the value
2073 -- of the Return_Applies_To attribute. Otherwise, the program is
2074 -- illegal. See RM-6.5(4/2).
2076 -----------------------------
2077 -- Find_What_It_Applies_To --
2078 -----------------------------
2080 function Find_What_It_Applies_To
return Entity_Id
is
2081 Result
: Entity_Id
:= Empty
;
2084 -- Loop outward through the Scope_Stack, skipping blocks, loops,
2085 -- and postconditions.
2087 for J
in reverse 0 .. Scope_Stack
.Last
loop
2088 Result
:= Scope_Stack
.Table
(J
).Entity
;
2089 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
2090 and then Chars
(Result
) /= Name_uPostconditions
;
2093 pragma Assert
(Present
(Result
));
2095 end Find_What_It_Applies_To
;
2097 -- Local declarations
2099 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
2100 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
2101 Loc
: constant Source_Ptr
:= Sloc
(N
);
2102 Stm_Entity
: constant Entity_Id
:=
2104 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
2106 -- Start of processing for Analyze_Return_Statement
2109 Set_Return_Statement_Entity
(N
, Stm_Entity
);
2111 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
2112 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
2114 -- Place Return entity on scope stack, to simplify enforcement of 6.5
2115 -- (4/2): an inner return statement will apply to this extended return.
2117 if Nkind
(N
) = N_Extended_Return_Statement
then
2118 Push_Scope
(Stm_Entity
);
2121 -- Check that pragma No_Return is obeyed. Don't complain about the
2122 -- implicitly-generated return that is placed at the end.
2124 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
2125 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
2128 -- Warn on any unassigned OUT parameters if in procedure
2130 if Ekind
(Scope_Id
) = E_Procedure
then
2131 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
2134 -- Check that functions return objects, and other things do not
2136 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
2137 if not Returns_Object
then
2138 Error_Msg_N
("missing expression in return from function", N
);
2141 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
2142 if Returns_Object
then
2143 Error_Msg_N
("procedure cannot return value (use function)", N
);
2146 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
2147 if Returns_Object
then
2148 if Is_Protected_Type
(Scope
(Scope_Id
)) then
2149 Error_Msg_N
("entry body cannot return value", N
);
2151 Error_Msg_N
("accept statement cannot return value", N
);
2155 elsif Kind
= E_Return_Statement
then
2157 -- We are nested within another return statement, which must be an
2158 -- extended_return_statement.
2160 if Returns_Object
then
2161 if Nkind
(N
) = N_Extended_Return_Statement
then
2163 ("extended return statement cannot be nested (use `RETURN;`)",
2166 -- Case of a simple return statement with a value inside extended
2167 -- return statement.
2171 ("return nested in extended return statement cannot return "
2172 & "value (use `RETURN;`)", N
);
2177 Error_Msg_N
("illegal context for return statement", N
);
2180 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
2181 Analyze_Function_Return
(N
);
2183 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
2184 Set_Return_Present
(Scope_Id
);
2187 if Nkind
(N
) = N_Extended_Return_Statement
then
2191 Kill_Current_Values
(Last_Assignment_Only
=> True);
2192 Check_Unreachable_Code
(N
);
2194 Analyze_Dimension
(N
);
2195 end Analyze_Return_Statement
;
2197 -------------------------------------
2198 -- Analyze_Simple_Return_Statement --
2199 -------------------------------------
2201 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
2203 if Present
(Expression
(N
)) then
2204 Mark_Coextensions
(N
, Expression
(N
));
2207 Analyze_Return_Statement
(N
);
2208 end Analyze_Simple_Return_Statement
;
2210 -------------------------
2211 -- Analyze_Return_Type --
2212 -------------------------
2214 procedure Analyze_Return_Type
(N
: Node_Id
) is
2215 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2216 Typ
: Entity_Id
:= Empty
;
2219 -- Normal case where result definition does not indicate an error
2221 if Result_Definition
(N
) /= Error
then
2222 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
2223 Check_SPARK_05_Restriction
2224 ("access result is not allowed", Result_Definition
(N
));
2226 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
2229 AD
: constant Node_Id
:=
2230 Access_To_Subprogram_Definition
(Result_Definition
(N
));
2232 if Present
(AD
) and then Protected_Present
(AD
) then
2233 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
2235 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
2239 Set_Parent
(Typ
, Result_Definition
(N
));
2240 Set_Is_Local_Anonymous_Access
(Typ
);
2241 Set_Etype
(Designator
, Typ
);
2243 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2245 Null_Exclusion_Static_Checks
(N
);
2247 -- Subtype_Mark case
2250 Find_Type
(Result_Definition
(N
));
2251 Typ
:= Entity
(Result_Definition
(N
));
2252 Set_Etype
(Designator
, Typ
);
2254 -- Unconstrained array as result is not allowed in SPARK
2256 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
2257 Check_SPARK_05_Restriction
2258 ("returning an unconstrained array is not allowed",
2259 Result_Definition
(N
));
2262 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2264 Null_Exclusion_Static_Checks
(N
);
2266 -- If a null exclusion is imposed on the result type, then create
2267 -- a null-excluding itype (an access subtype) and use it as the
2268 -- function's Etype. Note that the null exclusion checks are done
2269 -- right before this, because they don't get applied to types that
2270 -- do not come from source.
2272 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2273 Set_Etype
(Designator
,
2274 Create_Null_Excluding_Itype
2277 Scope_Id
=> Scope
(Current_Scope
)));
2279 -- The new subtype must be elaborated before use because
2280 -- it is visible outside of the function. However its base
2281 -- type may not be frozen yet, so the reference that will
2282 -- force elaboration must be attached to the freezing of
2285 -- If the return specification appears on a proper body,
2286 -- the subtype will have been created already on the spec.
2288 if Is_Frozen
(Typ
) then
2289 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2290 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2294 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2298 Ensure_Freeze_Node
(Typ
);
2301 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2303 Set_Itype
(IR
, Etype
(Designator
));
2304 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2309 Set_Etype
(Designator
, Typ
);
2312 if Ekind
(Typ
) = E_Incomplete_Type
2313 or else (Is_Class_Wide_Type
(Typ
)
2314 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2316 -- AI05-0151: Tagged incomplete types are allowed in all formal
2317 -- parts. Untagged incomplete types are not allowed in bodies.
2318 -- As a consequence, limited views cannot appear in a basic
2319 -- declaration that is itself within a body, because there is
2320 -- no point at which the non-limited view will become visible.
2322 if Ada_Version
>= Ada_2012
then
2323 if From_Limited_With
(Typ
) and then In_Package_Body
then
2325 ("invalid use of incomplete type&",
2326 Result_Definition
(N
), Typ
);
2328 -- The return type of a subprogram body cannot be of a
2329 -- formal incomplete type.
2331 elsif Is_Generic_Type
(Typ
)
2332 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2335 ("return type cannot be a formal incomplete type",
2336 Result_Definition
(N
));
2338 elsif Is_Class_Wide_Type
(Typ
)
2339 and then Is_Generic_Type
(Root_Type
(Typ
))
2340 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2343 ("return type cannot be a formal incomplete type",
2344 Result_Definition
(N
));
2346 elsif Is_Tagged_Type
(Typ
) then
2349 -- Use is legal in a thunk generated for an operation
2350 -- inherited from a progenitor.
2352 elsif Is_Thunk
(Designator
)
2353 and then Present
(Non_Limited_View
(Typ
))
2357 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2358 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2362 ("invalid use of untagged incomplete type&",
2366 -- The type must be completed in the current package. This
2367 -- is checked at the end of the package declaration when
2368 -- Taft-amendment types are identified. If the return type
2369 -- is class-wide, there is no required check, the type can
2370 -- be a bona fide TAT.
2372 if Ekind
(Scope
(Current_Scope
)) = E_Package
2373 and then In_Private_Part
(Scope
(Current_Scope
))
2374 and then not Is_Class_Wide_Type
(Typ
)
2376 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2381 ("invalid use of incomplete type&", Designator
, Typ
);
2386 -- Case where result definition does indicate an error
2389 Set_Etype
(Designator
, Any_Type
);
2391 end Analyze_Return_Type
;
2393 -----------------------------
2394 -- Analyze_Subprogram_Body --
2395 -----------------------------
2397 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2398 Loc
: constant Source_Ptr
:= Sloc
(N
);
2399 Body_Spec
: constant Node_Id
:= Specification
(N
);
2400 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2403 if Debug_Flag_C
then
2404 Write_Str
("==> subprogram body ");
2405 Write_Name
(Chars
(Body_Id
));
2406 Write_Str
(" from ");
2407 Write_Location
(Loc
);
2412 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2414 -- The real work is split out into the helper, so it can do "return;"
2415 -- without skipping the debug output:
2417 Analyze_Subprogram_Body_Helper
(N
);
2419 if Debug_Flag_C
then
2421 Write_Str
("<== subprogram body ");
2422 Write_Name
(Chars
(Body_Id
));
2423 Write_Str
(" from ");
2424 Write_Location
(Loc
);
2427 end Analyze_Subprogram_Body
;
2429 ------------------------------------
2430 -- Analyze_Subprogram_Body_Helper --
2431 ------------------------------------
2433 -- This procedure is called for regular subprogram bodies, generic bodies,
2434 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2435 -- specification matters, and is used to create a proper declaration for
2436 -- the subprogram, or to perform conformance checks.
2438 -- WARNING: This routine manages Ghost regions. Return statements must be
2439 -- replaced by gotos which jump to the end of the routine and restore the
2442 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2443 Body_Spec
: Node_Id
:= Specification
(N
);
2444 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2445 Loc
: constant Source_Ptr
:= Sloc
(N
);
2446 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2448 Conformant
: Boolean;
2449 Desig_View
: Entity_Id
:= Empty
;
2450 Exch_Views
: Elist_Id
:= No_Elist
;
2452 Mask_Types
: Elist_Id
:= No_Elist
;
2453 Prot_Typ
: Entity_Id
:= Empty
;
2454 Spec_Decl
: Node_Id
:= Empty
;
2455 Spec_Id
: Entity_Id
;
2457 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2458 -- When we analyze a separate spec, the entity chain ends up containing
2459 -- the formals, as well as any itypes generated during analysis of the
2460 -- default expressions for parameters, or the arguments of associated
2461 -- precondition/postcondition pragmas (which are analyzed in the context
2462 -- of the spec since they have visibility on formals).
2464 -- These entities belong with the spec and not the body. However we do
2465 -- the analysis of the body in the context of the spec (again to obtain
2466 -- visibility to the formals), and all the entities generated during
2467 -- this analysis end up also chained to the entity chain of the spec.
2468 -- But they really belong to the body, and there is circuitry to move
2469 -- them from the spec to the body.
2471 -- However, when we do this move, we don't want to move the real spec
2472 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2473 -- variable points to the last real spec entity, so we only move those
2474 -- chained beyond that point. It is initialized to Empty to deal with
2475 -- the case where there is no separate spec.
2477 function Body_Has_Contract
return Boolean;
2478 -- Check whether unanalyzed body has an aspect or pragma that may
2479 -- generate a SPARK contract.
2481 function Body_Has_SPARK_Mode_On
return Boolean;
2482 -- Check whether SPARK_Mode On applies to the subprogram body, either
2483 -- because it is specified directly on the body, or because it is
2484 -- inherited from the enclosing subprogram or package.
2486 procedure Build_Subprogram_Declaration
;
2487 -- Create a matching subprogram declaration for subprogram body N
2489 procedure Check_Anonymous_Return
;
2490 -- Ada 2005: if a function returns an access type that denotes a task,
2491 -- or a type that contains tasks, we must create a master entity for
2492 -- the anonymous type, which typically will be used in an allocator
2493 -- in the body of the function.
2495 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2496 -- Look ahead to recognize a pragma that may appear after the body.
2497 -- If there is a previous spec, check that it appears in the same
2498 -- declarative part. If the pragma is Inline_Always, perform inlining
2499 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2500 -- If the body acts as a spec, and inlining is required, we create a
2501 -- subprogram declaration for it, in order to attach the body to inline.
2502 -- If pragma does not appear after the body, check whether there is
2503 -- an inline pragma before any local declarations.
2505 procedure Check_Missing_Return
;
2506 -- Checks for a function with a no return statements, and also performs
2507 -- the warning checks implemented by Check_Returns. In formal mode, also
2508 -- verify that a function ends with a RETURN and that a procedure does
2509 -- not contain any RETURN.
2511 function Disambiguate_Spec
return Entity_Id
;
2512 -- When a primitive is declared between the private view and the full
2513 -- view of a concurrent type which implements an interface, a special
2514 -- mechanism is used to find the corresponding spec of the primitive
2517 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
;
2518 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2519 -- incomplete types coming from a limited context and replace their
2520 -- limited views with the non-limited ones. Return the list of changes
2521 -- to be used to undo the transformation.
2523 function Is_Private_Concurrent_Primitive
2524 (Subp_Id
: Entity_Id
) return Boolean;
2525 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2526 -- type that implements an interface and has a private view.
2528 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
;
2529 -- N is the body generated for an expression function that is not a
2530 -- completion and Spec_Id the defining entity of its spec. Mark all
2531 -- the not-yet-frozen types referenced by the simple return statement
2532 -- of the function as formally frozen.
2534 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
);
2535 -- Undo the transformation done by Exchange_Limited_Views.
2537 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2538 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2539 -- subprogram whose body is being analyzed. N is the statement node
2540 -- causing the flag to be set, if the following statement is a return
2541 -- of an entity, we mark the entity as set in source to suppress any
2542 -- warning on the stylized use of function stubs with a dummy return.
2544 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
);
2545 -- Undo the transformation done by Mask_Unfrozen_Types
2547 procedure Verify_Overriding_Indicator
;
2548 -- If there was a previous spec, the entity has been entered in the
2549 -- current scope previously. If the body itself carries an overriding
2550 -- indicator, check that it is consistent with the known status of the
2553 -----------------------
2554 -- Body_Has_Contract --
2555 -----------------------
2557 function Body_Has_Contract
return Boolean is
2558 Decls
: constant List_Id
:= Declarations
(N
);
2562 -- Check for aspects that may generate a contract
2564 if Present
(Aspect_Specifications
(N
)) then
2565 Item
:= First
(Aspect_Specifications
(N
));
2566 while Present
(Item
) loop
2567 if Is_Subprogram_Contract_Annotation
(Item
) then
2575 -- Check for pragmas that may generate a contract
2577 if Present
(Decls
) then
2578 Item
:= First
(Decls
);
2579 while Present
(Item
) loop
2580 if Nkind
(Item
) = N_Pragma
2581 and then Is_Subprogram_Contract_Annotation
(Item
)
2591 end Body_Has_Contract
;
2593 ----------------------------
2594 -- Body_Has_SPARK_Mode_On --
2595 ----------------------------
2597 function Body_Has_SPARK_Mode_On
return Boolean is
2598 Decls
: constant List_Id
:= Declarations
(N
);
2602 -- Check for SPARK_Mode aspect
2604 if Present
(Aspect_Specifications
(N
)) then
2605 Item
:= First
(Aspect_Specifications
(N
));
2606 while Present
(Item
) loop
2607 if Get_Aspect_Id
(Item
) = Aspect_SPARK_Mode
then
2608 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2615 -- Check for SPARK_Mode pragma
2617 if Present
(Decls
) then
2618 Item
:= First
(Decls
);
2619 while Present
(Item
) loop
2621 -- Pragmas that apply to a subprogram body are usually grouped
2622 -- together. Look for a potential pragma SPARK_Mode among them.
2624 if Nkind
(Item
) = N_Pragma
then
2625 if Get_Pragma_Id
(Item
) = Pragma_SPARK_Mode
then
2626 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2629 -- Otherwise the first non-pragma declarative item terminates
2630 -- the region where pragma SPARK_Mode may appear.
2640 -- Otherwise, the applicable SPARK_Mode is inherited from the
2641 -- enclosing subprogram or package.
2643 return SPARK_Mode
= On
;
2644 end Body_Has_SPARK_Mode_On
;
2646 ----------------------------------
2647 -- Build_Subprogram_Declaration --
2648 ----------------------------------
2650 procedure Build_Subprogram_Declaration
is
2651 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
);
2652 -- Relocate certain categorization pragmas from the declarative list
2653 -- of subprogram body From and insert them after node To. The pragmas
2656 -- Volatile_Function
2657 -- Also copy pragma SPARK_Mode if present in the declarative list
2658 -- of subprogram body From and insert it after node To. This pragma
2659 -- should not be moved, as it applies to the body too.
2665 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
) is
2667 Next_Decl
: Node_Id
;
2670 pragma Assert
(Nkind
(From
) = N_Subprogram_Body
);
2672 -- The destination node must be part of a list, as the pragmas are
2673 -- inserted after it.
2675 pragma Assert
(Is_List_Member
(To
));
2677 -- Inspect the declarations of the subprogram body looking for
2678 -- specific pragmas.
2680 Decl
:= First
(Declarations
(N
));
2681 while Present
(Decl
) loop
2682 Next_Decl
:= Next
(Decl
);
2684 if Nkind
(Decl
) = N_Pragma
then
2685 if Pragma_Name_Unmapped
(Decl
) = Name_SPARK_Mode
then
2686 Insert_After
(To
, New_Copy_Tree
(Decl
));
2688 elsif Nam_In
(Pragma_Name_Unmapped
(Decl
),
2690 Name_Volatile_Function
)
2693 Insert_After
(To
, Decl
);
2704 Subp_Decl
: Node_Id
;
2706 -- Start of processing for Build_Subprogram_Declaration
2709 -- Create a matching subprogram spec using the profile of the body.
2710 -- The structure of the tree is identical, but has new entities for
2711 -- the defining unit name and formal parameters.
2714 Make_Subprogram_Declaration
(Loc
,
2715 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2716 Set_Comes_From_Source
(Subp_Decl
, True);
2718 -- Relocate the aspects and relevant pragmas from the subprogram body
2719 -- to the generated spec because it acts as the initial declaration.
2721 Insert_Before
(N
, Subp_Decl
);
2722 Move_Aspects
(N
, To
=> Subp_Decl
);
2723 Move_Pragmas
(N
, To
=> Subp_Decl
);
2725 -- Ensure that the generated corresponding spec and original body
2726 -- share the same SPARK_Mode pragma or aspect. As a result, both have
2727 -- the same SPARK_Mode attributes, and the global SPARK_Mode value is
2728 -- correctly set for local subprograms.
2730 Copy_SPARK_Mode_Aspect
(Subp_Decl
, To
=> N
);
2732 Analyze
(Subp_Decl
);
2734 -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to
2735 -- the body since the expander may generate calls using that entity.
2736 -- Required to ensure that Expand_Call rewrites calls to this
2737 -- function by calls to the built procedure.
2739 if Modify_Tree_For_C
2740 and then Nkind
(Body_Spec
) = N_Function_Specification
2742 Rewritten_For_C
(Defining_Entity
(Specification
(Subp_Decl
)))
2744 Set_Rewritten_For_C
(Defining_Entity
(Body_Spec
));
2745 Set_Corresponding_Procedure
(Defining_Entity
(Body_Spec
),
2746 Corresponding_Procedure
2747 (Defining_Entity
(Specification
(Subp_Decl
))));
2750 -- Analyze any relocated source pragmas or pragmas created for aspect
2753 Decl
:= Next
(Subp_Decl
);
2754 while Present
(Decl
) loop
2756 -- Stop the search for pragmas once the body has been reached as
2757 -- this terminates the region where pragmas may appear.
2762 elsif Nkind
(Decl
) = N_Pragma
then
2769 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2770 Set_Corresponding_Spec
(N
, Spec_Id
);
2772 -- Mark the generated spec as a source construct to ensure that all
2773 -- calls to it are properly registered in ALI files for GNATprove.
2775 Set_Comes_From_Source
(Spec_Id
, True);
2777 -- Ensure that the specs of the subprogram declaration and its body
2778 -- are identical, otherwise they will appear non-conformant due to
2779 -- rewritings in the default values of formal parameters.
2781 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2782 Set_Specification
(N
, Body_Spec
);
2783 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2784 end Build_Subprogram_Declaration
;
2786 ----------------------------
2787 -- Check_Anonymous_Return --
2788 ----------------------------
2790 procedure Check_Anonymous_Return
is
2796 if Present
(Spec_Id
) then
2802 if Ekind
(Scop
) = E_Function
2803 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2804 and then not Is_Thunk
(Scop
)
2806 -- Skip internally built functions which handle the case of
2807 -- a null access (see Expand_Interface_Conversion)
2809 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2810 and then not Comes_From_Source
(Parent
(Scop
)))
2812 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2814 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2816 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2817 and then Expander_Active
2819 -- Avoid cases with no tasking support
2821 and then RTE_Available
(RE_Current_Master
)
2822 and then not Restriction_Active
(No_Task_Hierarchy
)
2825 Make_Object_Declaration
(Loc
,
2826 Defining_Identifier
=>
2827 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2828 Constant_Present
=> True,
2829 Object_Definition
=>
2830 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2832 Make_Explicit_Dereference
(Loc
,
2833 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2835 if Present
(Declarations
(N
)) then
2836 Prepend
(Decl
, Declarations
(N
));
2838 Set_Declarations
(N
, New_List
(Decl
));
2841 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2842 Set_Has_Master_Entity
(Scop
);
2844 -- Now mark the containing scope as a task master
2847 while Nkind
(Par
) /= N_Compilation_Unit
loop
2848 Par
:= Parent
(Par
);
2849 pragma Assert
(Present
(Par
));
2851 -- If we fall off the top, we are at the outer level, and
2852 -- the environment task is our effective master, so nothing
2856 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2858 Set_Is_Task_Master
(Par
, True);
2863 end Check_Anonymous_Return
;
2865 -------------------------
2866 -- Check_Inline_Pragma --
2867 -------------------------
2869 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2873 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2874 -- True when N is a pragma Inline or Inline_Always that applies
2875 -- to this subprogram.
2877 -----------------------
2878 -- Is_Inline_Pragma --
2879 -----------------------
2881 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2883 if Nkind
(N
) = N_Pragma
2885 (Pragma_Name_Unmapped
(N
) = Name_Inline_Always
2886 or else (Pragma_Name_Unmapped
(N
) = Name_Inline
2888 (Front_End_Inlining
or else Optimization_Level
> 0)))
2889 and then Present
(Pragma_Argument_Associations
(N
))
2892 Pragma_Arg
: Node_Id
:=
2893 Expression
(First
(Pragma_Argument_Associations
(N
)));
2895 if Nkind
(Pragma_Arg
) = N_Selected_Component
then
2896 Pragma_Arg
:= Selector_Name
(Pragma_Arg
);
2899 return Chars
(Pragma_Arg
) = Chars
(Body_Id
);
2905 end Is_Inline_Pragma
;
2907 -- Start of processing for Check_Inline_Pragma
2910 if not Expander_Active
then
2914 if Is_List_Member
(N
)
2915 and then Present
(Next
(N
))
2916 and then Is_Inline_Pragma
(Next
(N
))
2920 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2921 and then Present
(Declarations
(N
))
2922 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2924 Prag
:= First
(Declarations
(N
));
2930 if Present
(Prag
) then
2931 if Present
(Spec_Id
) then
2932 if Is_List_Member
(N
)
2933 and then Is_List_Member
(Unit_Declaration_Node
(Spec_Id
))
2934 and then In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
))
2940 -- Create a subprogram declaration, to make treatment uniform.
2941 -- Make the sloc of the subprogram name that of the entity in
2942 -- the body, so that style checks find identical strings.
2945 Subp
: constant Entity_Id
:=
2946 Make_Defining_Identifier
2947 (Sloc
(Body_Id
), Chars
(Body_Id
));
2948 Decl
: constant Node_Id
:=
2949 Make_Subprogram_Declaration
(Loc
,
2951 New_Copy_Tree
(Specification
(N
)));
2954 -- Link the body and the generated spec
2956 Set_Corresponding_Body
(Decl
, Body_Id
);
2957 Set_Corresponding_Spec
(N
, Subp
);
2959 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2961 -- To ensure proper coverage when body is inlined, indicate
2962 -- whether the subprogram comes from source.
2964 Set_Comes_From_Source
(Subp
, Comes_From_Source
(N
));
2966 if Present
(First_Formal
(Body_Id
)) then
2967 Plist
:= Copy_Parameter_List
(Body_Id
);
2968 Set_Parameter_Specifications
2969 (Specification
(Decl
), Plist
);
2972 -- Move aspects to the new spec
2974 if Has_Aspects
(N
) then
2975 Move_Aspects
(N
, To
=> Decl
);
2978 Insert_Before
(N
, Decl
);
2981 Set_Has_Pragma_Inline
(Subp
);
2983 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2984 Set_Is_Inlined
(Subp
);
2985 Set_Has_Pragma_Inline_Always
(Subp
);
2988 -- Prior to copying the subprogram body to create a template
2989 -- for it for subsequent inlining, remove the pragma from
2990 -- the current body so that the copy that will produce the
2991 -- new body will start from a completely unanalyzed tree.
2993 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2994 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
3001 end Check_Inline_Pragma
;
3003 --------------------------
3004 -- Check_Missing_Return --
3005 --------------------------
3007 procedure Check_Missing_Return
is
3009 Missing_Ret
: Boolean;
3012 if Nkind
(Body_Spec
) = N_Function_Specification
then
3013 if Present
(Spec_Id
) then
3019 if Return_Present
(Id
) then
3020 Check_Returns
(HSS
, 'F', Missing_Ret
);
3023 Set_Has_Missing_Return
(Id
);
3026 -- Within a premature instantiation of a package with no body, we
3027 -- build completions of the functions therein, with a Raise
3028 -- statement. No point in complaining about a missing return in
3031 elsif Ekind
(Id
) = E_Function
3032 and then In_Instance
3033 and then Present
(Statements
(HSS
))
3034 and then Nkind
(First
(Statements
(HSS
))) = N_Raise_Program_Error
3038 elsif Is_Generic_Subprogram
(Id
)
3039 or else not Is_Machine_Code_Subprogram
(Id
)
3041 Error_Msg_N
("missing RETURN statement in function body", N
);
3044 -- If procedure with No_Return, check returns
3046 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
3047 and then Present
(Spec_Id
)
3048 and then No_Return
(Spec_Id
)
3050 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
3053 -- Special checks in SPARK mode
3055 if Nkind
(Body_Spec
) = N_Function_Specification
then
3057 -- In SPARK mode, last statement of a function should be a return
3060 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
3063 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
3064 N_Extended_Return_Statement
)
3066 Check_SPARK_05_Restriction
3067 ("last statement in function should be RETURN", Stat
);
3071 -- In SPARK mode, verify that a procedure has no return
3073 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
3074 if Present
(Spec_Id
) then
3080 -- Would be nice to point to return statement here, can we
3081 -- borrow the Check_Returns procedure here ???
3083 if Return_Present
(Id
) then
3084 Check_SPARK_05_Restriction
3085 ("procedure should not have RETURN", N
);
3088 end Check_Missing_Return
;
3090 -----------------------
3091 -- Disambiguate_Spec --
3092 -----------------------
3094 function Disambiguate_Spec
return Entity_Id
is
3095 Priv_Spec
: Entity_Id
;
3098 procedure Replace_Types
(To_Corresponding
: Boolean);
3099 -- Depending on the flag, replace the type of formal parameters of
3100 -- Body_Id if it is a concurrent type implementing interfaces with
3101 -- the corresponding record type or the other way around.
3103 procedure Replace_Types
(To_Corresponding
: Boolean) is
3105 Formal_Typ
: Entity_Id
;
3108 Formal
:= First_Formal
(Body_Id
);
3109 while Present
(Formal
) loop
3110 Formal_Typ
:= Etype
(Formal
);
3112 if Is_Class_Wide_Type
(Formal_Typ
) then
3113 Formal_Typ
:= Root_Type
(Formal_Typ
);
3116 -- From concurrent type to corresponding record
3118 if To_Corresponding
then
3119 if Is_Concurrent_Type
(Formal_Typ
)
3120 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
3123 (Corresponding_Record_Type
(Formal_Typ
)))
3126 Corresponding_Record_Type
(Formal_Typ
));
3129 -- From corresponding record to concurrent type
3132 if Is_Concurrent_Record_Type
(Formal_Typ
)
3133 and then Present
(Interfaces
(Formal_Typ
))
3136 Corresponding_Concurrent_Type
(Formal_Typ
));
3140 Next_Formal
(Formal
);
3144 -- Start of processing for Disambiguate_Spec
3147 -- Try to retrieve the specification of the body as is. All error
3148 -- messages are suppressed because the body may not have a spec in
3149 -- its current state.
3151 Spec_N
:= Find_Corresponding_Spec
(N
, False);
3153 -- It is possible that this is the body of a primitive declared
3154 -- between a private and a full view of a concurrent type. The
3155 -- controlling parameter of the spec carries the concurrent type,
3156 -- not the corresponding record type as transformed by Analyze_
3157 -- Subprogram_Specification. In such cases, we undo the change
3158 -- made by the analysis of the specification and try to find the
3161 -- Note that wrappers already have their corresponding specs and
3162 -- bodies set during their creation, so if the candidate spec is
3163 -- a wrapper, then we definitely need to swap all types to their
3164 -- original concurrent status.
3167 or else Is_Primitive_Wrapper
(Spec_N
)
3169 -- Restore all references of corresponding record types to the
3170 -- original concurrent types.
3172 Replace_Types
(To_Corresponding
=> False);
3173 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
3175 -- The current body truly belongs to a primitive declared between
3176 -- a private and a full view. We leave the modified body as is,
3177 -- and return the true spec.
3179 if Present
(Priv_Spec
)
3180 and then Is_Private_Primitive
(Priv_Spec
)
3185 -- In case that this is some sort of error, restore the original
3186 -- state of the body.
3188 Replace_Types
(To_Corresponding
=> True);
3192 end Disambiguate_Spec
;
3194 ----------------------------
3195 -- Exchange_Limited_Views --
3196 ----------------------------
3198 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
is
3199 Result
: Elist_Id
:= No_Elist
;
3201 procedure Detect_And_Exchange
(Id
: Entity_Id
);
3202 -- Determine whether Id's type denotes an incomplete type associated
3203 -- with a limited with clause and exchange the limited view with the
3204 -- non-limited one when available. Note that the non-limited view
3205 -- may exist because of a with_clause in another unit in the context,
3206 -- but cannot be used because the current view of the enclosing unit
3207 -- is still a limited view.
3209 -------------------------
3210 -- Detect_And_Exchange --
3211 -------------------------
3213 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
3214 Typ
: constant Entity_Id
:= Etype
(Id
);
3216 if From_Limited_With
(Typ
)
3217 and then Has_Non_Limited_View
(Typ
)
3218 and then not From_Limited_With
(Scope
(Typ
))
3221 Result
:= New_Elmt_List
;
3224 Prepend_Elmt
(Typ
, Result
);
3225 Prepend_Elmt
(Id
, Result
);
3226 Set_Etype
(Id
, Non_Limited_View
(Typ
));
3228 end Detect_And_Exchange
;
3234 -- Start of processing for Exchange_Limited_Views
3237 -- Do not process subprogram bodies as they already use the non-
3238 -- limited view of types.
3240 if not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
3244 -- Examine all formals and swap views when applicable
3246 Formal
:= First_Formal
(Subp_Id
);
3247 while Present
(Formal
) loop
3248 Detect_And_Exchange
(Formal
);
3250 Next_Formal
(Formal
);
3253 -- Process the return type of a function
3255 if Ekind
(Subp_Id
) = E_Function
then
3256 Detect_And_Exchange
(Subp_Id
);
3260 end Exchange_Limited_Views
;
3262 -------------------------------------
3263 -- Is_Private_Concurrent_Primitive --
3264 -------------------------------------
3266 function Is_Private_Concurrent_Primitive
3267 (Subp_Id
: Entity_Id
) return Boolean
3269 Formal_Typ
: Entity_Id
;
3272 if Present
(First_Formal
(Subp_Id
)) then
3273 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
3275 if Is_Concurrent_Record_Type
(Formal_Typ
) then
3276 if Is_Class_Wide_Type
(Formal_Typ
) then
3277 Formal_Typ
:= Root_Type
(Formal_Typ
);
3280 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
3283 -- The type of the first formal is a concurrent tagged type with
3287 Is_Concurrent_Type
(Formal_Typ
)
3288 and then Is_Tagged_Type
(Formal_Typ
)
3289 and then Has_Private_Declaration
(Formal_Typ
);
3293 end Is_Private_Concurrent_Primitive
;
3295 -------------------------
3296 -- Mask_Unfrozen_Types --
3297 -------------------------
3299 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
is
3300 Result
: Elist_Id
:= No_Elist
;
3302 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
;
3303 -- Mask all types referenced in the subtree rooted at Node
3305 --------------------
3306 -- Mask_Type_Refs --
3307 --------------------
3309 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
is
3310 procedure Mask_Type
(Typ
: Entity_Id
);
3311 -- ??? what does this do?
3317 procedure Mask_Type
(Typ
: Entity_Id
) is
3319 -- Skip Itypes created by the preanalysis
3322 and then Scope_Within_Or_Same
(Scope
(Typ
), Spec_Id
)
3327 if not Is_Frozen
(Typ
) then
3328 Set_Is_Frozen
(Typ
);
3329 Append_New_Elmt
(Typ
, Result
);
3333 -- Start of processing for Mask_Type_Refs
3336 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
3337 Mask_Type
(Etype
(Entity
(Node
)));
3339 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
3340 Mask_Type
(Scope
(Entity
(Node
)));
3343 elsif Nkind_In
(Node
, N_Aggregate
, N_Null
, N_Type_Conversion
)
3344 and then Present
(Etype
(Node
))
3346 Mask_Type
(Etype
(Node
));
3352 procedure Mask_References
is new Traverse_Proc
(Mask_Type_Refs
);
3356 Return_Stmt
: constant Node_Id
:=
3357 First
(Statements
(Handled_Statement_Sequence
(N
)));
3359 -- Start of processing for Mask_Unfrozen_Types
3362 pragma Assert
(Nkind
(Return_Stmt
) = N_Simple_Return_Statement
);
3364 Mask_References
(Expression
(Return_Stmt
));
3367 end Mask_Unfrozen_Types
;
3369 ---------------------------
3370 -- Restore_Limited_Views --
3371 ---------------------------
3373 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
) is
3374 Elmt
: Elmt_Id
:= First_Elmt
(Restore_List
);
3378 while Present
(Elmt
) loop
3381 Set_Etype
(Id
, Node
(Elmt
));
3384 end Restore_Limited_Views
;
3386 ----------------------------
3387 -- Set_Trivial_Subprogram --
3388 ----------------------------
3390 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
3391 Nxt
: constant Node_Id
:= Next
(N
);
3394 Set_Is_Trivial_Subprogram
(Body_Id
);
3396 if Present
(Spec_Id
) then
3397 Set_Is_Trivial_Subprogram
(Spec_Id
);
3401 and then Nkind
(Nxt
) = N_Simple_Return_Statement
3402 and then No
(Next
(Nxt
))
3403 and then Present
(Expression
(Nxt
))
3404 and then Is_Entity_Name
(Expression
(Nxt
))
3406 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
3408 end Set_Trivial_Subprogram
;
3410 ---------------------------
3411 -- Unmask_Unfrozen_Types --
3412 ---------------------------
3414 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
) is
3415 Elmt
: Elmt_Id
:= First_Elmt
(Unmask_List
);
3418 while Present
(Elmt
) loop
3419 Set_Is_Frozen
(Node
(Elmt
), False);
3422 end Unmask_Unfrozen_Types
;
3424 ---------------------------------
3425 -- Verify_Overriding_Indicator --
3426 ---------------------------------
3428 procedure Verify_Overriding_Indicator
is
3430 if Must_Override
(Body_Spec
) then
3431 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3432 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3436 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
3438 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
3440 -- Overriding indicators aren't allowed for protected subprogram
3441 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3442 -- this to a warning if -gnatd.E is enabled.
3444 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3445 Error_Msg_Warn
:= Error_To_Warning
;
3447 ("<<overriding indicator not allowed for protected "
3448 & "subprogram body", Body_Spec
);
3451 elsif Must_Not_Override
(Body_Spec
) then
3452 if Present
(Overridden_Operation
(Spec_Id
)) then
3454 ("subprogram& overrides inherited operation",
3455 Body_Spec
, Spec_Id
);
3457 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3458 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3461 ("subprogram& overrides predefined operator ",
3462 Body_Spec
, Spec_Id
);
3464 -- Overriding indicators aren't allowed for protected subprogram
3465 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3466 -- this to a warning if -gnatd.E is enabled.
3468 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3469 Error_Msg_Warn
:= Error_To_Warning
;
3472 ("<<overriding indicator not allowed "
3473 & "for protected subprogram body", Body_Spec
);
3475 -- If this is not a primitive operation, then the overriding
3476 -- indicator is altogether illegal.
3478 elsif not Is_Primitive
(Spec_Id
) then
3480 ("overriding indicator only allowed "
3481 & "if subprogram is primitive", Body_Spec
);
3484 -- If checking the style rule and the operation overrides, then
3485 -- issue a warning about a missing overriding_indicator. Protected
3486 -- subprogram bodies are excluded from this style checking, since
3487 -- they aren't primitives (even though their declarations can
3488 -- override) and aren't allowed to have an overriding_indicator.
3491 and then Present
(Overridden_Operation
(Spec_Id
))
3492 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3494 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3495 Style
.Missing_Overriding
(N
, Body_Id
);
3498 and then Can_Override_Operator
(Spec_Id
)
3499 and then not In_Predefined_Unit
(Spec_Id
)
3501 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3502 Style
.Missing_Overriding
(N
, Body_Id
);
3504 end Verify_Overriding_Indicator
;
3508 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3509 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
3510 Saved_ISMP
: constant Boolean :=
3511 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3512 -- Save the Ghost and SPARK mode-related data to restore on exit
3514 -- Start of processing for Analyze_Subprogram_Body_Helper
3517 -- A [generic] subprogram body freezes the contract of the nearest
3518 -- enclosing package body and all other contracts encountered in the
3519 -- same declarative part up to and excluding the subprogram body:
3521 -- package body Nearest_Enclosing_Package
3522 -- with Refined_State => (State => Constit)
3526 -- procedure Freezes_Enclosing_Package_Body
3527 -- with Refined_Depends => (Input => Constit) ...
3529 -- This ensures that any annotations referenced by the contract of the
3530 -- [generic] subprogram body are available. This form of freezing is
3531 -- decoupled from the usual Freeze_xxx mechanism because it must also
3532 -- work in the context of generics where normal freezing is disabled.
3534 -- Only bodies coming from source should cause this type of freezing.
3535 -- Expression functions that act as bodies and complete an initial
3536 -- declaration must be included in this category, hence the use of
3539 if Comes_From_Source
(Original_Node
(N
)) then
3540 Freeze_Previous_Contracts
(N
);
3543 -- Generic subprograms are handled separately. They always have a
3544 -- generic specification. Determine whether current scope has a
3545 -- previous declaration.
3547 -- If the subprogram body is defined within an instance of the same
3548 -- name, the instance appears as a package renaming, and will be hidden
3549 -- within the subprogram.
3551 if Present
(Prev_Id
)
3552 and then not Is_Overloadable
(Prev_Id
)
3553 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3554 or else Comes_From_Source
(Prev_Id
))
3556 if Is_Generic_Subprogram
(Prev_Id
) then
3559 -- A subprogram body is Ghost when it is stand alone and subject
3560 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3561 -- the mode now to ensure that any nodes generated during analysis
3562 -- and expansion are properly marked as Ghost.
3564 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3566 -- If the body completes the initial declaration of a compilation
3567 -- unit which is subject to pragma Elaboration_Checks, set the
3568 -- model specified by the pragma because it applies to all parts
3571 Install_Elaboration_Model
(Spec_Id
);
3573 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3574 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3576 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3578 if Nkind
(N
) = N_Subprogram_Body
then
3579 HSS
:= Handled_Statement_Sequence
(N
);
3580 Check_Missing_Return
;
3585 -- Otherwise a previous entity conflicts with the subprogram name.
3586 -- Attempting to enter name will post error.
3589 Enter_Name
(Body_Id
);
3593 -- Non-generic case, find the subprogram declaration, if one was seen,
3594 -- or enter new overloaded entity in the current scope. If the
3595 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3596 -- part of the context of one of its subunits. No need to redo the
3599 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3603 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3605 if Nkind
(N
) = N_Subprogram_Body_Stub
3606 or else No
(Corresponding_Spec
(N
))
3608 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3609 Spec_Id
:= Disambiguate_Spec
;
3611 -- A subprogram body is Ghost when it is stand alone and
3612 -- subject to pragma Ghost or when the corresponding spec is
3613 -- Ghost. Set the mode now to ensure that any nodes generated
3614 -- during analysis and expansion are properly marked as Ghost.
3616 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3618 -- If the body completes a compilation unit which is subject
3619 -- to pragma Elaboration_Checks, set the model specified by
3620 -- the pragma because it applies to all parts of the unit.
3622 Install_Elaboration_Model
(Spec_Id
);
3625 Spec_Id
:= Find_Corresponding_Spec
(N
);
3627 -- A subprogram body is Ghost when it is stand alone and
3628 -- subject to pragma Ghost or when the corresponding spec is
3629 -- Ghost. Set the mode now to ensure that any nodes generated
3630 -- during analysis and expansion are properly marked as Ghost.
3632 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3634 -- If the body completes a compilation unit which is subject
3635 -- to pragma Elaboration_Checks, set the model specified by
3636 -- the pragma because it applies to all parts of the unit.
3638 Install_Elaboration_Model
(Spec_Id
);
3640 -- In GNATprove mode, if the body has no previous spec, create
3641 -- one so that the inlining machinery can operate properly.
3642 -- Transfer aspects, if any, to the new spec, so that they
3643 -- are legal and can be processed ahead of the body.
3644 -- We make two copies of the given spec, one for the new
3645 -- declaration, and one for the body.
3647 if No
(Spec_Id
) and then GNATprove_Mode
3649 -- Inlining does not apply during pre-analysis of code
3651 and then Full_Analysis
3653 -- Inlining only applies to full bodies, not stubs
3655 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3657 -- Inlining only applies to bodies in the source code, not to
3658 -- those generated by the compiler. In particular, expression
3659 -- functions, whose body is generated by the compiler, are
3660 -- treated specially by GNATprove.
3662 and then Comes_From_Source
(Body_Id
)
3664 -- This cannot be done for a compilation unit, which is not
3665 -- in a context where we can insert a new spec.
3667 and then Is_List_Member
(N
)
3669 -- Inlining only applies to subprograms without contracts,
3670 -- as a contract is a sign that GNATprove should perform a
3671 -- modular analysis of the subprogram instead of a contextual
3672 -- analysis at each call site. The same test is performed in
3673 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3674 -- here in another form (because the contract has not been
3675 -- attached to the body) to avoid front-end errors in case
3676 -- pragmas are used instead of aspects, because the
3677 -- corresponding pragmas in the body would not be transferred
3678 -- to the spec, leading to legality errors.
3680 and then not Body_Has_Contract
3681 and then not Inside_A_Generic
3683 Build_Subprogram_Declaration
;
3685 -- If this is a function that returns a constrained array, and
3686 -- we are generating SPARK_For_C, create subprogram declaration
3687 -- to simplify subsequent C generation.
3690 and then Modify_Tree_For_C
3691 and then Nkind
(Body_Spec
) = N_Function_Specification
3692 and then Is_Array_Type
(Etype
(Body_Id
))
3693 and then Is_Constrained
(Etype
(Body_Id
))
3695 Build_Subprogram_Declaration
;
3699 -- If this is a duplicate body, no point in analyzing it
3701 if Error_Posted
(N
) then
3705 -- A subprogram body should cause freezing of its own declaration,
3706 -- but if there was no previous explicit declaration, then the
3707 -- subprogram will get frozen too late (there may be code within
3708 -- the body that depends on the subprogram having been frozen,
3709 -- such as uses of extra formals), so we force it to be frozen
3710 -- here. Same holds if the body and spec are compilation units.
3711 -- Finally, if the return type is an anonymous access to protected
3712 -- subprogram, it must be frozen before the body because its
3713 -- expansion has generated an equivalent type that is used when
3714 -- elaborating the body.
3716 -- An exception in the case of Ada 2012, AI05-177: The bodies
3717 -- created for expression functions do not freeze.
3720 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3722 Freeze_Before
(N
, Body_Id
);
3724 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3725 Freeze_Before
(N
, Spec_Id
);
3727 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3728 Freeze_Before
(N
, Etype
(Body_Id
));
3732 Spec_Id
:= Corresponding_Spec
(N
);
3734 -- A subprogram body is Ghost when it is stand alone and subject
3735 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3736 -- the mode now to ensure that any nodes generated during analysis
3737 -- and expansion are properly marked as Ghost.
3739 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3741 -- If the body completes the initial declaration of a compilation
3742 -- unit which is subject to pragma Elaboration_Checks, set the
3743 -- model specified by the pragma because it applies to all parts
3746 Install_Elaboration_Model
(Spec_Id
);
3750 -- Previously we scanned the body to look for nested subprograms, and
3751 -- rejected an inline directive if nested subprograms were present,
3752 -- because the back-end would generate conflicting symbols for the
3753 -- nested bodies. This is now unnecessary.
3755 -- Look ahead to recognize a pragma Inline that appears after the body
3757 Check_Inline_Pragma
(Spec_Id
);
3759 -- Deal with special case of a fully private operation in the body of
3760 -- the protected type. We must create a declaration for the subprogram,
3761 -- in order to attach the protected subprogram that will be used in
3762 -- internal calls. We exclude compiler generated bodies from the
3763 -- expander since the issue does not arise for those cases.
3766 and then Comes_From_Source
(N
)
3767 and then Is_Protected_Type
(Current_Scope
)
3769 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3772 -- If we are generating C and this is a function returning a constrained
3773 -- array type for which we must create a procedure with an extra out
3774 -- parameter, build and analyze the body now. The procedure declaration
3775 -- has already been created. We reuse the source body of the function,
3776 -- because in an instance it may contain global references that cannot
3777 -- be reanalyzed. The source function itself is not used any further,
3778 -- so we mark it as having a completion. If the subprogram is a stub the
3779 -- transformation is done later, when the proper body is analyzed.
3782 and then Modify_Tree_For_C
3783 and then Present
(Spec_Id
)
3784 and then Ekind
(Spec_Id
) = E_Function
3785 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3786 and then Rewritten_For_C
(Spec_Id
)
3788 Set_Has_Completion
(Spec_Id
);
3790 Rewrite
(N
, Build_Procedure_Body_Form
(Spec_Id
, N
));
3793 -- The entity for the created procedure must remain invisible, so it
3794 -- does not participate in resolution of subsequent references to the
3797 Set_Is_Immediately_Visible
(Corresponding_Spec
(N
), False);
3801 -- If a separate spec is present, then deal with freezing issues
3803 if Present
(Spec_Id
) then
3804 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3805 Verify_Overriding_Indicator
;
3807 -- In general, the spec will be frozen when we start analyzing the
3808 -- body. However, for internally generated operations, such as
3809 -- wrapper functions for inherited operations with controlling
3810 -- results, the spec may not have been frozen by the time we expand
3811 -- the freeze actions that include the bodies. In particular, extra
3812 -- formals for accessibility or for return-in-place may need to be
3813 -- generated. Freeze nodes, if any, are inserted before the current
3814 -- body. These freeze actions are also needed in ASIS mode and in
3815 -- Compile_Only mode to enable the proper back-end type annotations.
3816 -- They are necessary in any case to insure order of elaboration
3819 if not Is_Frozen
(Spec_Id
)
3820 and then (Expander_Active
3822 or else (Operating_Mode
= Check_Semantics
3823 and then Serious_Errors_Detected
= 0))
3825 -- The body generated for an expression function that is not a
3826 -- completion is a freeze point neither for the profile nor for
3827 -- anything else. That's why, in order to prevent any freezing
3828 -- during analysis, we need to mask types declared outside the
3829 -- expression that are not yet frozen.
3831 if Nkind
(N
) = N_Subprogram_Body
3832 and then Was_Expression_Function
(N
)
3833 and then not Has_Completion
(Spec_Id
)
3835 Set_Is_Frozen
(Spec_Id
);
3836 Mask_Types
:= Mask_Unfrozen_Types
(Spec_Id
);
3838 Set_Has_Delayed_Freeze
(Spec_Id
);
3839 Freeze_Before
(N
, Spec_Id
);
3844 -- If the subprogram has a class-wide clone, build its body as a copy
3845 -- of the original body, and rewrite body of original subprogram as a
3846 -- wrapper that calls the clone.
3847 -- If N is a stub, this construction will take place when the proper
3848 -- body is analyzed.
3850 if Present
(Spec_Id
)
3851 and then Present
(Class_Wide_Clone
(Spec_Id
))
3852 and then (Comes_From_Source
(N
) or else Was_Expression_Function
(N
))
3853 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3855 Build_Class_Wide_Clone_Body
(Spec_Id
, N
);
3857 -- This is the new body for the existing primitive operation
3859 Rewrite
(N
, Build_Class_Wide_Clone_Call
3860 (Sloc
(N
), New_List
, Spec_Id
, Parent
(Spec_Id
)));
3861 Set_Has_Completion
(Spec_Id
, False);
3866 -- Place subprogram on scope stack, and make formals visible. If there
3867 -- is a spec, the visible entity remains that of the spec.
3869 if Present
(Spec_Id
) then
3870 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3872 if Is_Child_Unit
(Spec_Id
) then
3873 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3877 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3880 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3881 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3883 if Is_Abstract_Subprogram
(Spec_Id
) then
3884 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3888 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3889 Set_Has_Completion
(Spec_Id
);
3891 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3892 Prot_Typ
:= Scope
(Spec_Id
);
3895 -- If this is a body generated for a renaming, do not check for
3896 -- full conformance. The check is redundant, because the spec of
3897 -- the body is a copy of the spec in the renaming declaration,
3898 -- and the test can lead to spurious errors on nested defaults.
3900 if Present
(Spec_Decl
)
3901 and then not Comes_From_Source
(N
)
3903 (Nkind
(Original_Node
(Spec_Decl
)) =
3904 N_Subprogram_Renaming_Declaration
3905 or else (Present
(Corresponding_Body
(Spec_Decl
))
3907 Nkind
(Unit_Declaration_Node
3908 (Corresponding_Body
(Spec_Decl
))) =
3909 N_Subprogram_Renaming_Declaration
))
3913 -- Conversely, the spec may have been generated for specless body
3914 -- with an inline pragma. The entity comes from source, which is
3915 -- both semantically correct and necessary for proper inlining.
3916 -- The subprogram declaration itself is not in the source.
3918 elsif Comes_From_Source
(N
)
3919 and then Present
(Spec_Decl
)
3920 and then not Comes_From_Source
(Spec_Decl
)
3921 and then Has_Pragma_Inline
(Spec_Id
)
3928 Fully_Conformant
, True, Conformant
, Body_Id
);
3931 -- If the body is not fully conformant, we have to decide if we
3932 -- should analyze it or not. If it has a really messed up profile
3933 -- then we probably should not analyze it, since we will get too
3934 -- many bogus messages.
3936 -- Our decision is to go ahead in the non-fully conformant case
3937 -- only if it is at least mode conformant with the spec. Note
3938 -- that the call to Check_Fully_Conformant has issued the proper
3939 -- error messages to complain about the lack of conformance.
3942 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3948 -- In the case we are dealing with an expression function we check
3949 -- the formals attached to the spec instead of the body - so we don't
3950 -- reference body formals.
3952 if Spec_Id
/= Body_Id
3953 and then not Is_Expression_Function
(Spec_Id
)
3955 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3958 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3960 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3961 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3966 Set_Corresponding_Spec
(N
, Spec_Id
);
3968 -- Ada 2005 (AI-345): If the operation is a primitive operation
3969 -- of a concurrent type, the type of the first parameter has been
3970 -- replaced with the corresponding record, which is the proper
3971 -- run-time structure to use. However, within the body there may
3972 -- be uses of the formals that depend on primitive operations
3973 -- of the type (in particular calls in prefixed form) for which
3974 -- we need the original concurrent type. The operation may have
3975 -- several controlling formals, so the replacement must be done
3978 if Comes_From_Source
(Spec_Id
)
3979 and then Present
(First_Entity
(Spec_Id
))
3980 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3981 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3982 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3983 and then Present
(Corresponding_Concurrent_Type
3984 (Etype
(First_Entity
(Spec_Id
))))
3987 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3991 Form
:= First_Formal
(Spec_Id
);
3992 while Present
(Form
) loop
3993 if Etype
(Form
) = Typ
then
3994 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
4002 -- Make the formals visible, and place subprogram on scope stack.
4003 -- This is also the point at which we set Last_Real_Spec_Entity
4004 -- to mark the entities which will not be moved to the body.
4006 Install_Formals
(Spec_Id
);
4007 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
4009 -- Within an instance, add local renaming declarations so that
4010 -- gdb can retrieve the values of actuals more easily. This is
4011 -- only relevant if generating code (and indeed we definitely
4012 -- do not want these definitions -gnatc mode, because that would
4015 if Is_Generic_Instance
(Spec_Id
)
4016 and then Is_Wrapper_Package
(Current_Scope
)
4017 and then Expander_Active
4019 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
4022 Push_Scope
(Spec_Id
);
4024 -- Make sure that the subprogram is immediately visible. For
4025 -- child units that have no separate spec this is indispensable.
4026 -- Otherwise it is safe albeit redundant.
4028 Set_Is_Immediately_Visible
(Spec_Id
);
4031 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
4032 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
4033 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
4035 -- Case of subprogram body with no previous spec
4038 -- Check for style warning required
4042 -- Only apply check for source level subprograms for which checks
4043 -- have not been suppressed.
4045 and then Comes_From_Source
(Body_Id
)
4046 and then not Suppress_Style_Checks
(Body_Id
)
4048 -- No warnings within an instance
4050 and then not In_Instance
4052 -- No warnings for expression functions
4054 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
4056 Style
.Body_With_No_Spec
(N
);
4059 New_Overloaded_Entity
(Body_Id
);
4061 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
4062 Set_Acts_As_Spec
(N
);
4063 Generate_Definition
(Body_Id
);
4065 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
4067 -- If the body is an entry wrapper created for an entry with
4068 -- preconditions, it must be compiled in the context of the
4069 -- enclosing synchronized object, because it may mention other
4070 -- operations of the type.
4072 if Is_Entry_Wrapper
(Body_Id
) then
4074 Prot
: constant Entity_Id
:= Etype
(First_Entity
(Body_Id
));
4077 Install_Declarations
(Prot
);
4081 Install_Formals
(Body_Id
);
4083 Push_Scope
(Body_Id
);
4086 -- For stubs and bodies with no previous spec, generate references to
4089 Generate_Reference_To_Formals
(Body_Id
);
4092 -- Entry barrier functions are generated outside the protected type and
4093 -- should not carry the SPARK_Mode of the enclosing context.
4095 if Nkind
(N
) = N_Subprogram_Body
4096 and then Is_Entry_Barrier_Function
(N
)
4100 -- The body is generated as part of expression function expansion. When
4101 -- the expression function appears in the visible declarations of a
4102 -- package, the body is added to the private declarations. Since both
4103 -- declarative lists may be subject to a different SPARK_Mode, inherit
4104 -- the mode of the spec.
4106 -- package P with SPARK_Mode is
4107 -- function Expr_Func ... is (...); -- original
4108 -- [function Expr_Func ...;] -- generated spec
4111 -- pragma SPARK_Mode (Off);
4112 -- [function Expr_Func ... is return ...;] -- generated body
4113 -- end P; -- mode is ON
4115 elsif not Comes_From_Source
(N
)
4116 and then Present
(Spec_Id
)
4117 and then Is_Expression_Function
(Spec_Id
)
4119 Set_SPARK_Pragma
(Body_Id
, SPARK_Pragma
(Spec_Id
));
4120 Set_SPARK_Pragma_Inherited
4121 (Body_Id
, SPARK_Pragma_Inherited
(Spec_Id
));
4123 -- Set the SPARK_Mode from the current context (may be overwritten later
4124 -- with explicit pragma). Exclude the case where the SPARK_Mode appears
4125 -- initially on a stand-alone subprogram body, but is then relocated to
4126 -- a generated corresponding spec. In this scenario the mode is shared
4127 -- between the spec and body.
4129 elsif No
(SPARK_Pragma
(Body_Id
)) then
4130 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
4131 Set_SPARK_Pragma_Inherited
(Body_Id
);
4134 -- A subprogram body may be instantiated or inlined at a later pass.
4135 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it
4136 -- applied to the initial declaration of the body.
4138 if Present
(Spec_Id
) then
4139 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
4140 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4144 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in
4145 -- case the body is instantiated or inlined later and out of context.
4146 -- The body uses this attribute to restore the value of the global
4149 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4150 Set_Ignore_SPARK_Mode_Pragmas
(Body_Id
);
4152 elsif Ignore_SPARK_Mode_Pragmas
(Body_Id
) then
4153 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4157 -- Preserve relevant elaboration-related attributes of the context which
4158 -- are no longer available or very expensive to recompute once analysis,
4159 -- resolution, and expansion are over.
4161 if No
(Spec_Id
) then
4162 Mark_Elaboration_Attributes
4168 -- If this is the proper body of a stub, we must verify that the stub
4169 -- conforms to the body, and to the previous spec if one was present.
4170 -- We know already that the body conforms to that spec. This test is
4171 -- only required for subprograms that come from source.
4173 if Nkind
(Parent
(N
)) = N_Subunit
4174 and then Comes_From_Source
(N
)
4175 and then not Error_Posted
(Body_Id
)
4176 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
4177 N_Subprogram_Body_Stub
4180 Old_Id
: constant Entity_Id
:=
4182 (Specification
(Corresponding_Stub
(Parent
(N
))));
4184 Conformant
: Boolean := False;
4187 if No
(Spec_Id
) then
4188 Check_Fully_Conformant
(Body_Id
, Old_Id
);
4192 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
4194 if not Conformant
then
4196 -- The stub was taken to be a new declaration. Indicate that
4199 Set_Has_Completion
(Old_Id
, False);
4205 Set_Has_Completion
(Body_Id
);
4206 Check_Eliminated
(Body_Id
);
4208 -- Analyze any aspect specifications that appear on the subprogram body
4209 -- stub. Stop the analysis now as the stub does not have a declarative
4210 -- or a statement part, and it cannot be inlined.
4212 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4213 if Has_Aspects
(N
) then
4214 Analyze_Aspects_On_Subprogram_Body_Or_Stub
(N
);
4222 -- Note: Normally we don't do any inlining if expansion is off, since
4223 -- we won't generate code in any case. An exception arises in GNATprove
4224 -- mode where we want to expand some calls in place, even with expansion
4225 -- disabled, since the inlining eases formal verification.
4227 if not GNATprove_Mode
4228 and then Expander_Active
4229 and then Serious_Errors_Detected
= 0
4230 and then Present
(Spec_Id
)
4231 and then Has_Pragma_Inline
(Spec_Id
)
4233 -- Legacy implementation (relying on front-end inlining)
4235 if not Back_End_Inlining
then
4236 if (Has_Pragma_Inline_Always
(Spec_Id
)
4237 and then not Opt
.Disable_FE_Inline_Always
)
4238 or else (Front_End_Inlining
4239 and then not Opt
.Disable_FE_Inline
)
4241 Build_Body_To_Inline
(N
, Spec_Id
);
4244 -- New implementation (relying on back-end inlining)
4247 if Has_Pragma_Inline_Always
(Spec_Id
)
4248 or else Optimization_Level
> 0
4250 -- Handle function returning an unconstrained type
4252 if Comes_From_Source
(Body_Id
)
4253 and then Ekind
(Spec_Id
) = E_Function
4254 and then Returns_Unconstrained_Type
(Spec_Id
)
4256 -- If function builds in place, i.e. returns a limited type,
4257 -- inlining cannot be done.
4259 and then not Is_Limited_Type
(Etype
(Spec_Id
))
4261 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
4265 Subp_Body
: constant Node_Id
:=
4266 Unit_Declaration_Node
(Body_Id
);
4267 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
4270 -- Do not pass inlining to the backend if the subprogram
4271 -- has declarations or statements which cannot be inlined
4272 -- by the backend. This check is done here to emit an
4273 -- error instead of the generic warning message reported
4274 -- by the GCC backend (ie. "function might not be
4277 if Present
(Subp_Decl
)
4278 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
4282 elsif Has_Excluded_Statement
4285 (Handled_Statement_Sequence
(Subp_Body
)))
4289 -- If the backend inlining is available then at this
4290 -- stage we only have to mark the subprogram as inlined.
4291 -- The expander will take care of registering it in the
4292 -- table of subprograms inlined by the backend a part of
4293 -- processing calls to it (cf. Expand_Call)
4296 Set_Is_Inlined
(Spec_Id
);
4303 -- In GNATprove mode, inline only when there is a separate subprogram
4304 -- declaration for now, as inlining of subprogram bodies acting as
4305 -- declarations, or subprogram stubs, are not supported by front-end
4306 -- inlining. This inlining should occur after analysis of the body, so
4307 -- that it is known whether the value of SPARK_Mode, which can be
4308 -- defined by a pragma inside the body, is applicable to the body.
4309 -- Inlining can be disabled with switch -gnatdm
4311 elsif GNATprove_Mode
4312 and then Full_Analysis
4313 and then not Inside_A_Generic
4314 and then Present
(Spec_Id
)
4316 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
4317 and then Body_Has_SPARK_Mode_On
4318 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
4319 and then not Body_Has_Contract
4320 and then not Debug_Flag_M
4322 Build_Body_To_Inline
(N
, Spec_Id
);
4325 -- When generating code, inherited pre/postconditions are handled when
4326 -- expanding the corresponding contract.
4328 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
4329 -- of the specification we have to install the private withed units.
4330 -- This holds for child units as well.
4332 if Is_Compilation_Unit
(Body_Id
)
4333 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
4335 Install_Private_With_Clauses
(Body_Id
);
4338 Check_Anonymous_Return
;
4340 -- Set the Protected_Formal field of each extra formal of the protected
4341 -- subprogram to reference the corresponding extra formal of the
4342 -- subprogram that implements it. For regular formals this occurs when
4343 -- the protected subprogram's declaration is expanded, but the extra
4344 -- formals don't get created until the subprogram is frozen. We need to
4345 -- do this before analyzing the protected subprogram's body so that any
4346 -- references to the original subprogram's extra formals will be changed
4347 -- refer to the implementing subprogram's formals (see Expand_Formal).
4349 if Present
(Spec_Id
)
4350 and then Is_Protected_Type
(Scope
(Spec_Id
))
4351 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
4354 Impl_Subp
: constant Entity_Id
:=
4355 Protected_Body_Subprogram
(Spec_Id
);
4356 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
4357 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
4360 while Present
(Prot_Ext_Formal
) loop
4361 pragma Assert
(Present
(Impl_Ext_Formal
));
4362 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
4363 Next_Formal_With_Extras
(Prot_Ext_Formal
);
4364 Next_Formal_With_Extras
(Impl_Ext_Formal
);
4369 -- Now we can go on to analyze the body
4371 HSS
:= Handled_Statement_Sequence
(N
);
4372 Set_Actual_Subtypes
(N
, Current_Scope
);
4374 -- Add a declaration for the Protection object, renaming declarations
4375 -- for discriminals and privals and finally a declaration for the entry
4376 -- family index (if applicable). This form of early expansion is done
4377 -- when the Expander is active because Install_Private_Data_Declarations
4378 -- references entities which were created during regular expansion. The
4379 -- subprogram entity must come from source, and not be an internally
4380 -- generated subprogram.
4383 and then Present
(Prot_Typ
)
4384 and then Present
(Spec_Id
)
4385 and then Comes_From_Source
(Spec_Id
)
4386 and then not Is_Eliminated
(Spec_Id
)
4388 Install_Private_Data_Declarations
4389 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
4392 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
4393 -- may now appear in parameter and result profiles. Since the analysis
4394 -- of a subprogram body may use the parameter and result profile of the
4395 -- spec, swap any limited views with their non-limited counterpart.
4397 if Ada_Version
>= Ada_2012
and then Present
(Spec_Id
) then
4398 Exch_Views
:= Exchange_Limited_Views
(Spec_Id
);
4401 -- If the return type is an anonymous access type whose designated type
4402 -- is the limited view of a class-wide type and the non-limited view is
4403 -- available, update the return type accordingly.
4405 if Ada_Version
>= Ada_2005
and then Present
(Spec_Id
) then
4411 Rtyp
:= Etype
(Spec_Id
);
4413 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
4414 Etyp
:= Directly_Designated_Type
(Rtyp
);
4416 if Is_Class_Wide_Type
(Etyp
)
4417 and then From_Limited_With
(Etyp
)
4420 Set_Directly_Designated_Type
(Rtyp
, Available_View
(Etyp
));
4426 -- Analyze any aspect specifications that appear on the subprogram body
4428 if Has_Aspects
(N
) then
4429 Analyze_Aspects_On_Subprogram_Body_Or_Stub
(N
);
4432 Analyze_Declarations
(Declarations
(N
));
4434 -- Verify that the SPARK_Mode of the body agrees with that of its spec
4436 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
4437 if Present
(SPARK_Pragma
(Spec_Id
)) then
4438 if Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Spec_Id
)) = Off
4440 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
4442 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4443 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
4444 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
4446 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
4449 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
4453 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4454 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
4455 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
4457 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
4461 -- A subprogram body freezes its own contract. Analyze the contract
4462 -- after the declarations of the body have been processed as pragmas
4463 -- are now chained on the contract of the subprogram body.
4465 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
4467 -- Check completion, and analyze the statements
4470 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
4473 -- Deal with end of scope processing for the body
4475 Process_End_Label
(HSS
, 't', Current_Scope
);
4476 Update_Use_Clause_Chain
;
4479 -- If we are compiling an entry wrapper, remove the enclosing
4480 -- synchronized object from the stack.
4482 if Is_Entry_Wrapper
(Body_Id
) then
4486 Check_Subprogram_Order
(N
);
4487 Set_Analyzed
(Body_Id
);
4489 -- If we have a separate spec, then the analysis of the declarations
4490 -- caused the entities in the body to be chained to the spec id, but
4491 -- we want them chained to the body id. Only the formal parameters
4492 -- end up chained to the spec id in this case.
4494 if Present
(Spec_Id
) then
4496 -- We must conform to the categorization of our spec
4498 Validate_Categorization_Dependency
(N
, Spec_Id
);
4500 -- And if this is a child unit, the parent units must conform
4502 if Is_Child_Unit
(Spec_Id
) then
4503 Validate_Categorization_Dependency
4504 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
4507 -- Here is where we move entities from the spec to the body
4509 -- Case where there are entities that stay with the spec
4511 if Present
(Last_Real_Spec_Entity
) then
4513 -- No body entities (happens when the only real spec entities come
4514 -- from precondition and postcondition pragmas).
4516 if No
(Last_Entity
(Body_Id
)) then
4517 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
4519 -- Body entities present (formals), so chain stuff past them
4523 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
4526 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
4527 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4528 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
4530 -- Case where there are no spec entities, in this case there can be
4531 -- no body entities either, so just move everything.
4533 -- If the body is generated for an expression function, it may have
4534 -- been preanalyzed already, if 'access was applied to it.
4537 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
4538 N_Expression_Function
4540 pragma Assert
(No
(Last_Entity
(Body_Id
)));
4544 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
4545 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4546 Set_First_Entity
(Spec_Id
, Empty
);
4547 Set_Last_Entity
(Spec_Id
, Empty
);
4550 -- Otherwise the body does not complete a previous declaration. Check
4551 -- the categorization of the body against the units it withs.
4554 Validate_Categorization_Dependency
(N
, Body_Id
);
4557 Check_Missing_Return
;
4559 -- Now we are going to check for variables that are never modified in
4560 -- the body of the procedure. But first we deal with a special case
4561 -- where we want to modify this check. If the body of the subprogram
4562 -- starts with a raise statement or its equivalent, or if the body
4563 -- consists entirely of a null statement, then it is pretty obvious that
4564 -- it is OK to not reference the parameters. For example, this might be
4565 -- the following common idiom for a stubbed function: statement of the
4566 -- procedure raises an exception. In particular this deals with the
4567 -- common idiom of a stubbed function, which appears something like:
4569 -- function F (A : Integer) return Some_Type;
4572 -- raise Program_Error;
4576 -- Here the purpose of X is simply to satisfy the annoying requirement
4577 -- in Ada that there be at least one return, and we certainly do not
4578 -- want to go posting warnings on X that it is not initialized. On
4579 -- the other hand, if X is entirely unreferenced that should still
4582 -- What we do is to detect these cases, and if we find them, flag the
4583 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
4584 -- suppress unwanted warnings. For the case of the function stub above
4585 -- we have a special test to set X as apparently assigned to suppress
4592 -- Skip call markers installed by the ABE mechanism, labels, and
4593 -- Push_xxx_Error_Label to find the first real statement.
4595 Stm
:= First
(Statements
(HSS
));
4596 while Nkind_In
(Stm
, N_Call_Marker
, N_Label
)
4597 or else Nkind
(Stm
) in N_Push_xxx_Label
4602 -- Do the test on the original statement before expansion
4605 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
4608 -- If explicit raise statement, turn on flag
4610 if Nkind
(Ostm
) = N_Raise_Statement
then
4611 Set_Trivial_Subprogram
(Stm
);
4613 -- If null statement, and no following statements, turn on flag
4615 elsif Nkind
(Stm
) = N_Null_Statement
4616 and then Comes_From_Source
(Stm
)
4617 and then No
(Next
(Stm
))
4619 Set_Trivial_Subprogram
(Stm
);
4621 -- Check for explicit call cases which likely raise an exception
4623 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
4624 if Is_Entity_Name
(Name
(Ostm
)) then
4626 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
4629 -- If the procedure is marked No_Return, then likely it
4630 -- raises an exception, but in any case it is not coming
4631 -- back here, so turn on the flag.
4634 and then Ekind
(Ent
) = E_Procedure
4635 and then No_Return
(Ent
)
4637 Set_Trivial_Subprogram
(Stm
);
4645 -- Check for variables that are never modified
4652 -- If there is a separate spec, then transfer Never_Set_In_Source
4653 -- flags from out parameters to the corresponding entities in the
4654 -- body. The reason we do that is we want to post error flags on
4655 -- the body entities, not the spec entities.
4657 if Present
(Spec_Id
) then
4658 E1
:= First_Entity
(Spec_Id
);
4659 while Present
(E1
) loop
4660 if Ekind
(E1
) = E_Out_Parameter
then
4661 E2
:= First_Entity
(Body_Id
);
4662 while Present
(E2
) loop
4663 exit when Chars
(E1
) = Chars
(E2
);
4667 if Present
(E2
) then
4668 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
4676 -- Check references of the subprogram spec when we are dealing with
4677 -- an expression function due to it having a generated body.
4678 -- Otherwise, we simply check the formals of the subprogram body.
4680 if Present
(Spec_Id
)
4681 and then Is_Expression_Function
(Spec_Id
)
4683 Check_References
(Spec_Id
);
4685 Check_References
(Body_Id
);
4689 -- Check for nested subprogram, and mark outer level subprogram if so
4695 if Present
(Spec_Id
) then
4702 Ent
:= Enclosing_Subprogram
(Ent
);
4703 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
4706 if Present
(Ent
) then
4707 Set_Has_Nested_Subprogram
(Ent
);
4711 -- Restore the limited views in the spec, if any, to let the back end
4712 -- process it without running into circularities.
4714 if Exch_Views
/= No_Elist
then
4715 Restore_Limited_Views
(Exch_Views
);
4718 if Mask_Types
/= No_Elist
then
4719 Unmask_Unfrozen_Types
(Mask_Types
);
4722 if Present
(Desig_View
) then
4723 Set_Directly_Designated_Type
(Etype
(Spec_Id
), Desig_View
);
4727 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4728 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
4729 end Analyze_Subprogram_Body_Helper
;
4731 ------------------------------------
4732 -- Analyze_Subprogram_Declaration --
4733 ------------------------------------
4735 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4736 Scop
: constant Entity_Id
:= Current_Scope
;
4737 Designator
: Entity_Id
;
4739 Is_Completion
: Boolean;
4740 -- Indicates whether a null procedure declaration is a completion
4743 -- Null procedures are not allowed in SPARK
4745 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4746 and then Null_Present
(Specification
(N
))
4748 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4750 -- Null procedures are allowed in protected types, following the
4751 -- recent AI12-0147.
4753 if Is_Protected_Type
(Current_Scope
)
4754 and then Ada_Version
< Ada_2012
4756 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4759 Analyze_Null_Procedure
(N
, Is_Completion
);
4761 -- The null procedure acts as a body, nothing further is needed
4763 if Is_Completion
then
4768 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4770 -- A reference may already have been generated for the unit name, in
4771 -- which case the following call is redundant. However it is needed for
4772 -- declarations that are the rewriting of an expression function.
4774 Generate_Definition
(Designator
);
4776 -- Set the SPARK mode from the current context (may be overwritten later
4777 -- with explicit pragma). This is not done for entry barrier functions
4778 -- because they are generated outside the protected type and should not
4779 -- carry the mode of the enclosing context.
4781 if Nkind
(N
) = N_Subprogram_Declaration
4782 and then Is_Entry_Barrier_Function
(N
)
4787 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4788 Set_SPARK_Pragma_Inherited
(Designator
);
4791 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
4792 -- the body of this subprogram is instantiated or inlined later and out
4793 -- of context. The body uses this attribute to restore the value of the
4796 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4797 Set_Ignore_SPARK_Mode_Pragmas
(Designator
);
4800 -- Preserve relevant elaboration-related attributes of the context which
4801 -- are no longer available or very expensive to recompute once analysis,
4802 -- resolution, and expansion are over.
4804 Mark_Elaboration_Attributes
4805 (N_Id
=> Designator
,
4809 if Debug_Flag_C
then
4810 Write_Str
("==> subprogram spec ");
4811 Write_Name
(Chars
(Designator
));
4812 Write_Str
(" from ");
4813 Write_Location
(Sloc
(N
));
4818 Validate_RCI_Subprogram_Declaration
(N
);
4819 New_Overloaded_Entity
(Designator
);
4820 Check_Delayed_Subprogram
(Designator
);
4822 -- If the type of the first formal of the current subprogram is a non-
4823 -- generic tagged private type, mark the subprogram as being a private
4824 -- primitive. Ditto if this is a function with controlling result, and
4825 -- the return type is currently private. In both cases, the type of the
4826 -- controlling argument or result must be in the current scope for the
4827 -- operation to be primitive.
4829 if Has_Controlling_Result
(Designator
)
4830 and then Is_Private_Type
(Etype
(Designator
))
4831 and then Scope
(Etype
(Designator
)) = Current_Scope
4832 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4834 Set_Is_Private_Primitive
(Designator
);
4836 elsif Present
(First_Formal
(Designator
)) then
4838 Formal_Typ
: constant Entity_Id
:=
4839 Etype
(First_Formal
(Designator
));
4841 Set_Is_Private_Primitive
(Designator
,
4842 Is_Tagged_Type
(Formal_Typ
)
4843 and then Scope
(Formal_Typ
) = Current_Scope
4844 and then Is_Private_Type
(Formal_Typ
)
4845 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4849 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4852 if Ada_Version
>= Ada_2005
4853 and then Comes_From_Source
(N
)
4854 and then Is_Dispatching_Operation
(Designator
)
4861 if Has_Controlling_Result
(Designator
) then
4862 Etyp
:= Etype
(Designator
);
4865 E
:= First_Entity
(Designator
);
4867 and then Is_Formal
(E
)
4868 and then not Is_Controlling_Formal
(E
)
4876 if Is_Access_Type
(Etyp
) then
4877 Etyp
:= Directly_Designated_Type
(Etyp
);
4880 if Is_Interface
(Etyp
)
4881 and then not Is_Abstract_Subprogram
(Designator
)
4882 and then not (Ekind
(Designator
) = E_Procedure
4883 and then Null_Present
(Specification
(N
)))
4885 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4887 -- Specialize error message based on procedures vs. functions,
4888 -- since functions can't be null subprograms.
4890 if Ekind
(Designator
) = E_Procedure
then
4892 ("interface procedure % must be abstract or null", N
);
4895 ("interface function % must be abstract", N
);
4901 -- What is the following code for, it used to be
4903 -- ??? Set_Suppress_Elaboration_Checks
4904 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4906 -- The following seems equivalent, but a bit dubious
4908 if Elaboration_Checks_Suppressed
(Designator
) then
4909 Set_Kill_Elaboration_Checks
(Designator
);
4912 -- For a compilation unit, set body required. This flag will only be
4913 -- reset if a valid Import or Interface pragma is processed later on.
4915 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4916 Set_Body_Required
(Parent
(N
), True);
4918 if Ada_Version
>= Ada_2005
4919 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4920 and then Null_Present
(Specification
(N
))
4923 ("null procedure cannot be declared at library level", N
);
4927 Generate_Reference_To_Formals
(Designator
);
4928 Check_Eliminated
(Designator
);
4930 if Debug_Flag_C
then
4932 Write_Str
("<== subprogram spec ");
4933 Write_Name
(Chars
(Designator
));
4934 Write_Str
(" from ");
4935 Write_Location
(Sloc
(N
));
4939 -- Indicate that this is a protected operation, because it may be used
4940 -- in subsequent declarations within the protected type.
4942 if Is_Protected_Type
(Current_Scope
) then
4943 Set_Convention
(Designator
, Convention_Protected
);
4946 List_Inherited_Pre_Post_Aspects
(Designator
);
4948 -- Process the aspects before establishing the proper categorization in
4949 -- case the subprogram is a compilation unit and one of its aspects is
4950 -- converted into a categorization pragma.
4952 if Has_Aspects
(N
) then
4953 Analyze_Aspect_Specifications
(N
, Designator
);
4956 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4957 Set_Categorization_From_Scope
(Designator
, Scop
);
4959 -- Otherwise the unit is a compilation unit and/or a child unit. Set the
4960 -- proper categorization of the unit based on its pragmas.
4963 Push_Scope
(Designator
);
4964 Set_Categorization_From_Pragmas
(N
);
4965 Validate_Categorization_Dependency
(N
, Designator
);
4968 end Analyze_Subprogram_Declaration
;
4970 --------------------------------------
4971 -- Analyze_Subprogram_Specification --
4972 --------------------------------------
4974 -- Reminder: N here really is a subprogram specification (not a subprogram
4975 -- declaration). This procedure is called to analyze the specification in
4976 -- both subprogram bodies and subprogram declarations (specs).
4978 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4979 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean;
4980 -- Determine whether entity E denotes the spec or body of an invariant
4983 ------------------------------------
4984 -- Is_Invariant_Procedure_Or_Body --
4985 ------------------------------------
4987 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean is
4988 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
4992 if Nkind
(Decl
) = N_Subprogram_Body
then
4993 Spec
:= Corresponding_Spec
(Decl
);
5000 and then Ekind
(Spec
) = E_Procedure
5001 and then (Is_Partial_Invariant_Procedure
(Spec
)
5002 or else Is_Invariant_Procedure
(Spec
));
5003 end Is_Invariant_Procedure_Or_Body
;
5007 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
5008 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
5010 -- Start of processing for Analyze_Subprogram_Specification
5013 -- User-defined operator is not allowed in SPARK, except as a renaming
5015 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
5016 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
5018 Check_SPARK_05_Restriction
5019 ("user-defined operator is not allowed", N
);
5022 -- Proceed with analysis. Do not emit a cross-reference entry if the
5023 -- specification comes from an expression function, because it may be
5024 -- the completion of a previous declaration. If it is not, the cross-
5025 -- reference entry will be emitted for the new subprogram declaration.
5027 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
5028 Generate_Definition
(Designator
);
5031 if Nkind
(N
) = N_Function_Specification
then
5032 Set_Ekind
(Designator
, E_Function
);
5033 Set_Mechanism
(Designator
, Default_Mechanism
);
5035 Set_Ekind
(Designator
, E_Procedure
);
5036 Set_Etype
(Designator
, Standard_Void_Type
);
5039 -- Flag Is_Inlined_Always is True by default, and reversed to False for
5040 -- those subprograms which could be inlined in GNATprove mode (because
5041 -- Body_To_Inline is non-Empty) but should not be inlined.
5043 if GNATprove_Mode
then
5044 Set_Is_Inlined_Always
(Designator
);
5047 -- Introduce new scope for analysis of the formals and the return type
5049 Set_Scope
(Designator
, Current_Scope
);
5051 if Present
(Formals
) then
5052 Push_Scope
(Designator
);
5053 Process_Formals
(Formals
, N
);
5055 -- Check dimensions in N for formals with default expression
5057 Analyze_Dimension_Formals
(N
, Formals
);
5059 -- Ada 2005 (AI-345): If this is an overriding operation of an
5060 -- inherited interface operation, and the controlling type is
5061 -- a synchronized type, replace the type with its corresponding
5062 -- record, to match the proper signature of an overriding operation.
5063 -- Same processing for an access parameter whose designated type is
5064 -- derived from a synchronized interface.
5066 -- This modification is not done for invariant procedures because
5067 -- the corresponding record may not necessarely be visible when the
5068 -- concurrent type acts as the full view of a private type.
5071 -- type Prot is private with Type_Invariant => ...;
5072 -- procedure ConcInvariant (Obj : Prot);
5074 -- protected type Prot is ...;
5075 -- type Concurrent_Record_Prot is record ...;
5076 -- procedure ConcInvariant (Obj : Prot) is
5078 -- end ConcInvariant;
5081 -- In the example above, both the spec and body of the invariant
5082 -- procedure must utilize the private type as the controlling type.
5084 if Ada_Version
>= Ada_2005
5085 and then not Is_Invariant_Procedure_Or_Body
(Designator
)
5089 Formal_Typ
: Entity_Id
;
5090 Rec_Typ
: Entity_Id
;
5091 Desig_Typ
: Entity_Id
;
5094 Formal
:= First_Formal
(Designator
);
5095 while Present
(Formal
) loop
5096 Formal_Typ
:= Etype
(Formal
);
5098 if Is_Concurrent_Type
(Formal_Typ
)
5099 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
5101 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
5103 if Present
(Interfaces
(Rec_Typ
)) then
5104 Set_Etype
(Formal
, Rec_Typ
);
5107 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
5108 Desig_Typ
:= Designated_Type
(Formal_Typ
);
5110 if Is_Concurrent_Type
(Desig_Typ
)
5111 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
5113 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
5115 if Present
(Interfaces
(Rec_Typ
)) then
5116 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
5121 Next_Formal
(Formal
);
5128 -- The subprogram scope is pushed and popped around the processing of
5129 -- the return type for consistency with call above to Process_Formals
5130 -- (which itself can call Analyze_Return_Type), and to ensure that any
5131 -- itype created for the return type will be associated with the proper
5134 elsif Nkind
(N
) = N_Function_Specification
then
5135 Push_Scope
(Designator
);
5136 Analyze_Return_Type
(N
);
5142 if Nkind
(N
) = N_Function_Specification
then
5144 -- Deal with operator symbol case
5146 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
5147 Valid_Operator_Definition
(Designator
);
5150 May_Need_Actuals
(Designator
);
5152 -- Ada 2005 (AI-251): If the return type is abstract, verify that
5153 -- the subprogram is abstract also. This does not apply to renaming
5154 -- declarations, where abstractness is inherited, and to subprogram
5155 -- bodies generated for stream operations, which become renamings as
5158 -- In case of primitives associated with abstract interface types
5159 -- the check is applied later (see Analyze_Subprogram_Declaration).
5161 if not Nkind_In
(Original_Node
(Parent
(N
)),
5162 N_Abstract_Subprogram_Declaration
,
5163 N_Formal_Abstract_Subprogram_Declaration
,
5164 N_Subprogram_Renaming_Declaration
)
5166 if Is_Abstract_Type
(Etype
(Designator
))
5167 and then not Is_Interface
(Etype
(Designator
))
5170 ("function that returns abstract type must be abstract", N
);
5172 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
5173 -- access result whose designated type is abstract.
5175 elsif Ada_Version
>= Ada_2012
5176 and then Nkind
(Result_Definition
(N
)) = N_Access_Definition
5178 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
5179 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
5182 ("function whose access result designates abstract type "
5183 & "must be abstract", N
);
5189 end Analyze_Subprogram_Specification
;
5191 -----------------------
5192 -- Check_Conformance --
5193 -----------------------
5195 procedure Check_Conformance
5196 (New_Id
: Entity_Id
;
5198 Ctype
: Conformance_Type
;
5200 Conforms
: out Boolean;
5201 Err_Loc
: Node_Id
:= Empty
;
5202 Get_Inst
: Boolean := False;
5203 Skip_Controlling_Formals
: Boolean := False)
5205 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
5206 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
5207 -- If Errmsg is True, then processing continues to post an error message
5208 -- for conformance error on given node. Two messages are output. The
5209 -- first message points to the previous declaration with a general "no
5210 -- conformance" message. The second is the detailed reason, supplied as
5211 -- Msg. The parameter N provide information for a possible & insertion
5212 -- in the message, and also provides the location for posting the
5213 -- message in the absence of a specified Err_Loc location.
5215 function Conventions_Match
5217 Id2
: Entity_Id
) return Boolean;
5218 -- Determine whether the conventions of arbitrary entities Id1 and Id2
5221 -----------------------
5222 -- Conformance_Error --
5223 -----------------------
5225 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
5232 if No
(Err_Loc
) then
5238 Error_Msg_Sloc
:= Sloc
(Old_Id
);
5241 when Type_Conformant
=>
5242 Error_Msg_N
-- CODEFIX
5243 ("not type conformant with declaration#!", Enode
);
5245 when Mode_Conformant
=>
5246 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5248 ("not mode conformant with operation inherited#!",
5252 ("not mode conformant with declaration#!", Enode
);
5255 when Subtype_Conformant
=>
5256 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5258 ("not subtype conformant with operation inherited#!",
5262 ("not subtype conformant with declaration#!", Enode
);
5265 when Fully_Conformant
=>
5266 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5267 Error_Msg_N
-- CODEFIX
5268 ("not fully conformant with operation inherited#!",
5271 Error_Msg_N
-- CODEFIX
5272 ("not fully conformant with declaration#!", Enode
);
5276 Error_Msg_NE
(Msg
, Enode
, N
);
5278 end Conformance_Error
;
5280 -----------------------
5281 -- Conventions_Match --
5282 -----------------------
5284 function Conventions_Match
5286 Id2
: Entity_Id
) return Boolean
5289 -- Ignore the conventions of anonymous access-to-subprogram types
5290 -- and subprogram types because these are internally generated and
5291 -- the only way these may receive a convention is if they inherit
5292 -- the convention of a related subprogram.
5294 if Ekind_In
(Id1
, E_Anonymous_Access_Subprogram_Type
,
5297 Ekind_In
(Id2
, E_Anonymous_Access_Subprogram_Type
,
5302 -- Otherwise compare the conventions directly
5305 return Convention
(Id1
) = Convention
(Id2
);
5307 end Conventions_Match
;
5311 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
5312 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
5313 Old_Formal
: Entity_Id
;
5314 New_Formal
: Entity_Id
;
5315 Access_Types_Match
: Boolean;
5316 Old_Formal_Base
: Entity_Id
;
5317 New_Formal_Base
: Entity_Id
;
5319 -- Start of processing for Check_Conformance
5324 -- We need a special case for operators, since they don't appear
5327 if Ctype
= Type_Conformant
then
5328 if Ekind
(New_Id
) = E_Operator
5329 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
5335 -- If both are functions/operators, check return types conform
5337 if Old_Type
/= Standard_Void_Type
5339 New_Type
/= Standard_Void_Type
5341 -- If we are checking interface conformance we omit controlling
5342 -- arguments and result, because we are only checking the conformance
5343 -- of the remaining parameters.
5345 if Has_Controlling_Result
(Old_Id
)
5346 and then Has_Controlling_Result
(New_Id
)
5347 and then Skip_Controlling_Formals
5351 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
5352 if Ctype
>= Subtype_Conformant
5353 and then not Predicates_Match
(Old_Type
, New_Type
)
5356 ("\predicate of return type does not match!", New_Id
);
5359 ("\return type does not match!", New_Id
);
5365 -- Ada 2005 (AI-231): In case of anonymous access types check the
5366 -- null-exclusion and access-to-constant attributes match.
5368 if Ada_Version
>= Ada_2005
5369 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
5371 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
5372 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
5373 Is_Access_Constant
(Etype
(New_Type
)))
5375 Conformance_Error
("\return type does not match!", New_Id
);
5379 -- If either is a function/operator and the other isn't, error
5381 elsif Old_Type
/= Standard_Void_Type
5382 or else New_Type
/= Standard_Void_Type
5384 Conformance_Error
("\functions can only match functions!", New_Id
);
5388 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
5389 -- If this is a renaming as body, refine error message to indicate that
5390 -- the conflict is with the original declaration. If the entity is not
5391 -- frozen, the conventions don't have to match, the one of the renamed
5392 -- entity is inherited.
5394 if Ctype
>= Subtype_Conformant
then
5395 if not Conventions_Match
(Old_Id
, New_Id
) then
5396 if not Is_Frozen
(New_Id
) then
5399 elsif Present
(Err_Loc
)
5400 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
5401 and then Present
(Corresponding_Spec
(Err_Loc
))
5403 Error_Msg_Name_1
:= Chars
(New_Id
);
5405 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
5406 Conformance_Error
("\prior declaration for% has convention %!");
5409 Conformance_Error
("\calling conventions do not match!");
5414 elsif Is_Formal_Subprogram
(Old_Id
)
5415 or else Is_Formal_Subprogram
(New_Id
)
5416 or else (Is_Subprogram
(New_Id
)
5417 and then Present
(Alias
(New_Id
))
5418 and then Is_Formal_Subprogram
(Alias
(New_Id
)))
5421 ("\formal subprograms are not subtype conformant "
5422 & "(RM 6.3.1 (17/3))");
5426 -- Deal with parameters
5428 -- Note: we use the entity information, rather than going directly
5429 -- to the specification in the tree. This is not only simpler, but
5430 -- absolutely necessary for some cases of conformance tests between
5431 -- operators, where the declaration tree simply does not exist.
5433 Old_Formal
:= First_Formal
(Old_Id
);
5434 New_Formal
:= First_Formal
(New_Id
);
5435 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
5436 if Is_Controlling_Formal
(Old_Formal
)
5437 and then Is_Controlling_Formal
(New_Formal
)
5438 and then Skip_Controlling_Formals
5440 -- The controlling formals will have different types when
5441 -- comparing an interface operation with its match, but both
5442 -- or neither must be access parameters.
5444 if Is_Access_Type
(Etype
(Old_Formal
))
5446 Is_Access_Type
(Etype
(New_Formal
))
5448 goto Skip_Controlling_Formal
;
5451 ("\access parameter does not match!", New_Formal
);
5455 -- Ada 2012: Mode conformance also requires that formal parameters
5456 -- be both aliased, or neither.
5458 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
5459 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
5461 ("\aliased parameter mismatch!", New_Formal
);
5465 if Ctype
= Fully_Conformant
then
5467 -- Names must match. Error message is more accurate if we do
5468 -- this before checking that the types of the formals match.
5470 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
5471 Conformance_Error
("\name& does not match!", New_Formal
);
5473 -- Set error posted flag on new formal as well to stop
5474 -- junk cascaded messages in some cases.
5476 Set_Error_Posted
(New_Formal
);
5480 -- Null exclusion must match
5482 if Null_Exclusion_Present
(Parent
(Old_Formal
))
5484 Null_Exclusion_Present
(Parent
(New_Formal
))
5486 -- Only give error if both come from source. This should be
5487 -- investigated some time, since it should not be needed ???
5489 if Comes_From_Source
(Old_Formal
)
5491 Comes_From_Source
(New_Formal
)
5494 ("\null exclusion for& does not match", New_Formal
);
5496 -- Mark error posted on the new formal to avoid duplicated
5497 -- complaint about types not matching.
5499 Set_Error_Posted
(New_Formal
);
5504 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
5505 -- case occurs whenever a subprogram is being renamed and one of its
5506 -- parameters imposes a null exclusion. For example:
5508 -- type T is null record;
5509 -- type Acc_T is access T;
5510 -- subtype Acc_T_Sub is Acc_T;
5512 -- procedure P (Obj : not null Acc_T_Sub); -- itype
5513 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
5516 Old_Formal_Base
:= Etype
(Old_Formal
);
5517 New_Formal_Base
:= Etype
(New_Formal
);
5520 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
5521 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
5524 Access_Types_Match
:= Ada_Version
>= Ada_2005
5526 -- Ensure that this rule is only applied when New_Id is a
5527 -- renaming of Old_Id.
5529 and then Nkind
(Parent
(Parent
(New_Id
))) =
5530 N_Subprogram_Renaming_Declaration
5531 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
5532 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
5533 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
5535 -- Now handle the allowed access-type case
5537 and then Is_Access_Type
(Old_Formal_Base
)
5538 and then Is_Access_Type
(New_Formal_Base
)
5540 -- The type kinds must match. The only exception occurs with
5541 -- multiple generics of the form:
5544 -- type F is private; type A is private;
5545 -- type F_Ptr is access F; type A_Ptr is access A;
5546 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
5547 -- package F_Pack is ... package A_Pack is
5548 -- package F_Inst is
5549 -- new F_Pack (A, A_Ptr, A_P);
5551 -- When checking for conformance between the parameters of A_P
5552 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
5553 -- because the compiler has transformed A_Ptr into a subtype of
5554 -- F_Ptr. We catch this case in the code below.
5556 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
5558 (Is_Generic_Type
(Old_Formal_Base
)
5559 and then Is_Generic_Type
(New_Formal_Base
)
5560 and then Is_Internal
(New_Formal_Base
)
5561 and then Etype
(Etype
(New_Formal_Base
)) =
5563 and then Directly_Designated_Type
(Old_Formal_Base
) =
5564 Directly_Designated_Type
(New_Formal_Base
)
5565 and then ((Is_Itype
(Old_Formal_Base
)
5566 and then Can_Never_Be_Null
(Old_Formal_Base
))
5568 (Is_Itype
(New_Formal_Base
)
5569 and then Can_Never_Be_Null
(New_Formal_Base
)));
5571 -- Types must always match. In the visible part of an instance,
5572 -- usual overloading rules for dispatching operations apply, and
5573 -- we check base types (not the actual subtypes).
5575 if In_Instance_Visible_Part
5576 and then Is_Dispatching_Operation
(New_Id
)
5578 if not Conforming_Types
5579 (T1
=> Base_Type
(Etype
(Old_Formal
)),
5580 T2
=> Base_Type
(Etype
(New_Formal
)),
5582 Get_Inst
=> Get_Inst
)
5583 and then not Access_Types_Match
5585 Conformance_Error
("\type of & does not match!", New_Formal
);
5589 elsif not Conforming_Types
5590 (T1
=> Old_Formal_Base
,
5591 T2
=> New_Formal_Base
,
5593 Get_Inst
=> Get_Inst
)
5594 and then not Access_Types_Match
5596 -- Don't give error message if old type is Any_Type. This test
5597 -- avoids some cascaded errors, e.g. in case of a bad spec.
5599 if Errmsg
and then Old_Formal_Base
= Any_Type
then
5602 if Ctype
>= Subtype_Conformant
5604 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
5607 ("\predicate of & does not match!", New_Formal
);
5610 ("\type of & does not match!", New_Formal
);
5612 if not Dimensions_Match
(Old_Formal_Base
, New_Formal_Base
)
5614 Error_Msg_N
("\dimensions mismatch!", New_Formal
);
5622 -- For mode conformance, mode must match
5624 if Ctype
>= Mode_Conformant
then
5625 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
5626 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
5627 or else not Is_Primitive_Wrapper
(New_Id
)
5629 Conformance_Error
("\mode of & does not match!", New_Formal
);
5633 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
5635 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
5637 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
5640 ("\mode of & does not match!", New_Formal
);
5647 -- Part of mode conformance for access types is having the same
5648 -- constant modifier.
5650 elsif Access_Types_Match
5651 and then Is_Access_Constant
(Old_Formal_Base
) /=
5652 Is_Access_Constant
(New_Formal_Base
)
5655 ("\constant modifier does not match!", New_Formal
);
5660 if Ctype
>= Subtype_Conformant
then
5662 -- Ada 2005 (AI-231): In case of anonymous access types check
5663 -- the null-exclusion and access-to-constant attributes must
5664 -- match. For null exclusion, we test the types rather than the
5665 -- formals themselves, since the attribute is only set reliably
5666 -- on the formals in the Ada 95 case, and we exclude the case
5667 -- where Old_Formal is marked as controlling, to avoid errors
5668 -- when matching completing bodies with dispatching declarations
5669 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
5671 if Ada_Version
>= Ada_2005
5672 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
5673 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
5675 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
5676 Can_Never_Be_Null
(Etype
(New_Formal
))
5678 not Is_Controlling_Formal
(Old_Formal
))
5680 Is_Access_Constant
(Etype
(Old_Formal
)) /=
5681 Is_Access_Constant
(Etype
(New_Formal
)))
5683 -- Do not complain if error already posted on New_Formal. This
5684 -- avoids some redundant error messages.
5686 and then not Error_Posted
(New_Formal
)
5688 -- It is allowed to omit the null-exclusion in case of stream
5689 -- attribute subprograms. We recognize stream subprograms
5690 -- through their TSS-generated suffix.
5693 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
5696 if TSS_Name
/= TSS_Stream_Read
5697 and then TSS_Name
/= TSS_Stream_Write
5698 and then TSS_Name
/= TSS_Stream_Input
5699 and then TSS_Name
/= TSS_Stream_Output
5701 -- Here we have a definite conformance error. It is worth
5702 -- special casing the error message for the case of a
5703 -- controlling formal (which excludes null).
5705 if Is_Controlling_Formal
(New_Formal
) then
5706 Error_Msg_Node_2
:= Scope
(New_Formal
);
5708 ("\controlling formal & of & excludes null, "
5709 & "declaration must exclude null as well",
5712 -- Normal case (couldn't we give more detail here???)
5716 ("\type of & does not match!", New_Formal
);
5725 -- Full conformance checks
5727 if Ctype
= Fully_Conformant
then
5729 -- We have checked already that names match
5731 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
5733 -- Check default expressions for in parameters
5736 NewD
: constant Boolean :=
5737 Present
(Default_Value
(New_Formal
));
5738 OldD
: constant Boolean :=
5739 Present
(Default_Value
(Old_Formal
));
5741 if NewD
or OldD
then
5743 -- The old default value has been analyzed because the
5744 -- current full declaration will have frozen everything
5745 -- before. The new default value has not been analyzed,
5746 -- so analyze it now before we check for conformance.
5749 Push_Scope
(New_Id
);
5750 Preanalyze_Spec_Expression
5751 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5755 if not (NewD
and OldD
)
5756 or else not Fully_Conformant_Expressions
5757 (Default_Value
(Old_Formal
),
5758 Default_Value
(New_Formal
))
5761 ("\default expression for & does not match!",
5770 -- A couple of special checks for Ada 83 mode. These checks are
5771 -- skipped if either entity is an operator in package Standard,
5772 -- or if either old or new instance is not from the source program.
5774 if Ada_Version
= Ada_83
5775 and then Sloc
(Old_Id
) > Standard_Location
5776 and then Sloc
(New_Id
) > Standard_Location
5777 and then Comes_From_Source
(Old_Id
)
5778 and then Comes_From_Source
(New_Id
)
5781 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5782 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5785 -- Explicit IN must be present or absent in both cases. This
5786 -- test is required only in the full conformance case.
5788 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5789 and then Ctype
= Fully_Conformant
5792 ("\(Ada 83) IN must appear in both declarations",
5797 -- Grouping (use of comma in param lists) must be the same
5798 -- This is where we catch a misconformance like:
5801 -- A : Integer; B : Integer
5803 -- which are represented identically in the tree except
5804 -- for the setting of the flags More_Ids and Prev_Ids.
5806 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5807 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5810 ("\grouping of & does not match!", New_Formal
);
5816 -- This label is required when skipping controlling formals
5818 <<Skip_Controlling_Formal
>>
5820 Next_Formal
(Old_Formal
);
5821 Next_Formal
(New_Formal
);
5824 if Present
(Old_Formal
) then
5825 Conformance_Error
("\too few parameters!");
5828 elsif Present
(New_Formal
) then
5829 Conformance_Error
("\too many parameters!", New_Formal
);
5832 end Check_Conformance
;
5834 -----------------------
5835 -- Check_Conventions --
5836 -----------------------
5838 procedure Check_Conventions
(Typ
: Entity_Id
) is
5839 Ifaces_List
: Elist_Id
;
5841 procedure Check_Convention
(Op
: Entity_Id
);
5842 -- Verify that the convention of inherited dispatching operation Op is
5843 -- consistent among all subprograms it overrides. In order to minimize
5844 -- the search, Search_From is utilized to designate a specific point in
5845 -- the list rather than iterating over the whole list once more.
5847 ----------------------
5848 -- Check_Convention --
5849 ----------------------
5851 procedure Check_Convention
(Op
: Entity_Id
) is
5852 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5853 Iface_Conv
: Convention_Id
;
5854 Iface_Elmt
: Elmt_Id
;
5855 Iface_Prim_Elmt
: Elmt_Id
;
5856 Iface_Prim
: Entity_Id
;
5859 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5860 while Present
(Iface_Elmt
) loop
5862 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5863 while Present
(Iface_Prim_Elmt
) loop
5864 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5865 Iface_Conv
:= Convention
(Iface_Prim
);
5867 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5868 and then Iface_Conv
/= Op_Conv
5871 ("inconsistent conventions in primitive operations", Typ
);
5873 Error_Msg_Name_1
:= Chars
(Op
);
5874 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5875 Error_Msg_Sloc
:= Sloc
(Op
);
5877 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5878 if not Present
(Overridden_Operation
(Op
)) then
5879 Error_Msg_N
("\\primitive % defined #", Typ
);
5882 ("\\overriding operation % with "
5883 & "convention % defined #", Typ
);
5886 else pragma Assert
(Present
(Alias
(Op
)));
5887 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5888 Error_Msg_N
("\\inherited operation % with "
5889 & "convention % defined #", Typ
);
5892 Error_Msg_Name_1
:= Chars
(Op
);
5893 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5894 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5895 Error_Msg_N
("\\overridden operation % with "
5896 & "convention % defined #", Typ
);
5898 -- Avoid cascading errors
5903 Next_Elmt
(Iface_Prim_Elmt
);
5906 Next_Elmt
(Iface_Elmt
);
5908 end Check_Convention
;
5912 Prim_Op
: Entity_Id
;
5913 Prim_Op_Elmt
: Elmt_Id
;
5915 -- Start of processing for Check_Conventions
5918 if not Has_Interfaces
(Typ
) then
5922 Collect_Interfaces
(Typ
, Ifaces_List
);
5924 -- The algorithm checks every overriding dispatching operation against
5925 -- all the corresponding overridden dispatching operations, detecting
5926 -- differences in conventions.
5928 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5929 while Present
(Prim_Op_Elmt
) loop
5930 Prim_Op
:= Node
(Prim_Op_Elmt
);
5932 -- A small optimization: skip the predefined dispatching operations
5933 -- since they always have the same convention.
5935 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5936 Check_Convention
(Prim_Op
);
5939 Next_Elmt
(Prim_Op_Elmt
);
5941 end Check_Conventions
;
5943 ------------------------------
5944 -- Check_Delayed_Subprogram --
5945 ------------------------------
5947 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5948 procedure Possible_Freeze
(T
: Entity_Id
);
5949 -- T is the type of either a formal parameter or of the return type. If
5950 -- T is not yet frozen and needs a delayed freeze, then the subprogram
5951 -- itself must be delayed.
5953 ---------------------
5954 -- Possible_Freeze --
5955 ---------------------
5957 procedure Possible_Freeze
(T
: Entity_Id
) is
5958 Scop
: constant Entity_Id
:= Scope
(Designator
);
5961 -- If the subprogram appears within a package instance (which may be
5962 -- the wrapper package of a subprogram instance) the freeze node for
5963 -- that package will freeze the subprogram at the proper place, so
5964 -- do not emit a freeze node for the subprogram, given that it may
5965 -- appear in the wrong scope.
5967 if Ekind
(Scop
) = E_Package
5968 and then not Comes_From_Source
(Scop
)
5969 and then Is_Generic_Instance
(Scop
)
5973 elsif Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5974 Set_Has_Delayed_Freeze
(Designator
);
5976 elsif Is_Access_Type
(T
)
5977 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5978 and then not Is_Frozen
(Designated_Type
(T
))
5980 Set_Has_Delayed_Freeze
(Designator
);
5982 end Possible_Freeze
;
5988 -- Start of processing for Check_Delayed_Subprogram
5991 -- All subprograms, including abstract subprograms, may need a freeze
5992 -- node if some formal type or the return type needs one.
5994 Possible_Freeze
(Etype
(Designator
));
5995 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5997 -- Need delayed freeze if any of the formal types themselves need a
5998 -- delayed freeze and are not yet frozen.
6000 F
:= First_Formal
(Designator
);
6001 while Present
(F
) loop
6002 Possible_Freeze
(Etype
(F
));
6003 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
6007 -- Mark functions that return by reference. Note that it cannot be done
6008 -- for delayed_freeze subprograms because the underlying returned type
6009 -- may not be known yet (for private types).
6011 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
6013 Typ
: constant Entity_Id
:= Etype
(Designator
);
6014 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
6017 if Is_Limited_View
(Typ
) then
6018 Set_Returns_By_Ref
(Designator
);
6020 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
6021 Set_Returns_By_Ref
(Designator
);
6025 end Check_Delayed_Subprogram
;
6027 ------------------------------------
6028 -- Check_Discriminant_Conformance --
6029 ------------------------------------
6031 procedure Check_Discriminant_Conformance
6036 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
6037 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
6038 New_Discr_Id
: Entity_Id
;
6039 New_Discr_Type
: Entity_Id
;
6041 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
6042 -- Post error message for conformance error on given node. Two messages
6043 -- are output. The first points to the previous declaration with a
6044 -- general "no conformance" message. The second is the detailed reason,
6045 -- supplied as Msg. The parameter N provide information for a possible
6046 -- & insertion in the message.
6048 -----------------------
6049 -- Conformance_Error --
6050 -----------------------
6052 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
6054 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
6055 Error_Msg_N
-- CODEFIX
6056 ("not fully conformant with declaration#!", N
);
6057 Error_Msg_NE
(Msg
, N
, N
);
6058 end Conformance_Error
;
6060 -- Start of processing for Check_Discriminant_Conformance
6063 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
6064 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
6066 -- The subtype mark of the discriminant on the full type has not
6067 -- been analyzed so we do it here. For an access discriminant a new
6070 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
6072 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
6075 Analyze
(Discriminant_Type
(New_Discr
));
6076 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
6078 -- Ada 2005: if the discriminant definition carries a null
6079 -- exclusion, create an itype to check properly for consistency
6080 -- with partial declaration.
6082 if Is_Access_Type
(New_Discr_Type
)
6083 and then Null_Exclusion_Present
(New_Discr
)
6086 Create_Null_Excluding_Itype
6087 (T
=> New_Discr_Type
,
6088 Related_Nod
=> New_Discr
,
6089 Scope_Id
=> Current_Scope
);
6093 if not Conforming_Types
6094 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
6096 Conformance_Error
("type of & does not match!", New_Discr_Id
);
6099 -- Treat the new discriminant as an occurrence of the old one,
6100 -- for navigation purposes, and fill in some semantic
6101 -- information, for completeness.
6103 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
6104 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
6105 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
6110 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
6111 Conformance_Error
("name & does not match!", New_Discr_Id
);
6115 -- Default expressions must match
6118 NewD
: constant Boolean :=
6119 Present
(Expression
(New_Discr
));
6120 OldD
: constant Boolean :=
6121 Present
(Expression
(Parent
(Old_Discr
)));
6124 if NewD
or OldD
then
6126 -- The old default value has been analyzed and expanded,
6127 -- because the current full declaration will have frozen
6128 -- everything before. The new default values have not been
6129 -- expanded, so expand now to check conformance.
6132 Preanalyze_Spec_Expression
6133 (Expression
(New_Discr
), New_Discr_Type
);
6136 if not (NewD
and OldD
)
6137 or else not Fully_Conformant_Expressions
6138 (Expression
(Parent
(Old_Discr
)),
6139 Expression
(New_Discr
))
6143 ("default expression for & does not match!",
6150 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
6152 if Ada_Version
= Ada_83
then
6154 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
6157 -- Grouping (use of comma in param lists) must be the same
6158 -- This is where we catch a misconformance like:
6161 -- A : Integer; B : Integer
6163 -- which are represented identically in the tree except
6164 -- for the setting of the flags More_Ids and Prev_Ids.
6166 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
6167 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
6170 ("grouping of & does not match!", New_Discr_Id
);
6176 Next_Discriminant
(Old_Discr
);
6180 if Present
(Old_Discr
) then
6181 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
6184 elsif Present
(New_Discr
) then
6186 ("too many discriminants!", Defining_Identifier
(New_Discr
));
6189 end Check_Discriminant_Conformance
;
6191 ----------------------------
6192 -- Check_Fully_Conformant --
6193 ----------------------------
6195 procedure Check_Fully_Conformant
6196 (New_Id
: Entity_Id
;
6198 Err_Loc
: Node_Id
:= Empty
)
6201 pragma Warnings
(Off
, Result
);
6204 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
6205 end Check_Fully_Conformant
;
6207 --------------------------
6208 -- Check_Limited_Return --
6209 --------------------------
6211 procedure Check_Limited_Return
6217 -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and
6218 -- replaced by anonymous access results. This is an incompatibility with
6219 -- Ada 95. Not clear whether this should be enforced yet or perhaps
6220 -- controllable with special switch. ???
6222 -- A limited interface that is not immutably limited is OK
6224 if Is_Limited_Interface
(R_Type
)
6226 not (Is_Task_Interface
(R_Type
)
6227 or else Is_Protected_Interface
(R_Type
)
6228 or else Is_Synchronized_Interface
(R_Type
))
6232 elsif Is_Limited_Type
(R_Type
)
6233 and then not Is_Interface
(R_Type
)
6234 and then Comes_From_Source
(N
)
6235 and then not In_Instance_Body
6236 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
6238 -- Error in Ada 2005
6240 if Ada_Version
>= Ada_2005
6241 and then not Debug_Flag_Dot_L
6242 and then not GNAT_Mode
6245 ("(Ada 2005) cannot copy object of a limited type "
6246 & "(RM-2005 6.5(5.5/2))", Expr
);
6248 if Is_Limited_View
(R_Type
) then
6250 ("\return by reference not permitted in Ada 2005", Expr
);
6253 -- Warn in Ada 95 mode, to give folks a heads up about this
6256 -- In GNAT mode, this is just a warning, to allow it to be evilly
6257 -- turned off. Otherwise it is a real error.
6259 -- In a generic context, simplify the warning because it makes no
6260 -- sense to discuss pass-by-reference or copy.
6262 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
6263 if Inside_A_Generic
then
6265 ("return of limited object not permitted in Ada 2005 "
6266 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6268 elsif Is_Limited_View
(R_Type
) then
6270 ("return by reference not permitted in Ada 2005 "
6271 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6274 ("cannot copy object of a limited type in Ada 2005 "
6275 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6278 -- Ada 95 mode, and compatibility warnings disabled
6281 pragma Assert
(Ada_Version
<= Ada_95
);
6282 pragma Assert
(not (Warn_On_Ada_2005_Compatibility
or GNAT_Mode
));
6283 return; -- skip continuation messages below
6286 if not Inside_A_Generic
then
6288 ("\consider switching to return of access type", Expr
);
6289 Explain_Limited_Type
(R_Type
, Expr
);
6292 end Check_Limited_Return
;
6294 ---------------------------
6295 -- Check_Mode_Conformant --
6296 ---------------------------
6298 procedure Check_Mode_Conformant
6299 (New_Id
: Entity_Id
;
6301 Err_Loc
: Node_Id
:= Empty
;
6302 Get_Inst
: Boolean := False)
6305 pragma Warnings
(Off
, Result
);
6308 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
6309 end Check_Mode_Conformant
;
6311 --------------------------------
6312 -- Check_Overriding_Indicator --
6313 --------------------------------
6315 procedure Check_Overriding_Indicator
6317 Overridden_Subp
: Entity_Id
;
6318 Is_Primitive
: Boolean)
6324 -- No overriding indicator for literals
6326 if Ekind
(Subp
) = E_Enumeration_Literal
then
6329 elsif Ekind
(Subp
) = E_Entry
then
6330 Decl
:= Parent
(Subp
);
6332 -- No point in analyzing a malformed operator
6334 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
6335 and then Error_Posted
(Subp
)
6340 Decl
:= Unit_Declaration_Node
(Subp
);
6343 if Nkind_In
(Decl
, N_Subprogram_Body
,
6344 N_Subprogram_Body_Stub
,
6345 N_Subprogram_Declaration
,
6346 N_Abstract_Subprogram_Declaration
,
6347 N_Subprogram_Renaming_Declaration
)
6349 Spec
:= Specification
(Decl
);
6351 elsif Nkind
(Decl
) = N_Entry_Declaration
then
6358 -- The overriding operation is type conformant with the overridden one,
6359 -- but the names of the formals are not required to match. If the names
6360 -- appear permuted in the overriding operation, this is a possible
6361 -- source of confusion that is worth diagnosing. Controlling formals
6362 -- often carry names that reflect the type, and it is not worthwhile
6363 -- requiring that their names match.
6365 if Present
(Overridden_Subp
)
6366 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
6373 Form1
:= First_Formal
(Subp
);
6374 Form2
:= First_Formal
(Overridden_Subp
);
6376 -- If the overriding operation is a synchronized operation, skip
6377 -- the first parameter of the overridden operation, which is
6378 -- implicit in the new one. If the operation is declared in the
6379 -- body it is not primitive and all formals must match.
6381 if Is_Concurrent_Type
(Scope
(Subp
))
6382 and then Is_Tagged_Type
(Scope
(Subp
))
6383 and then not Has_Completion
(Scope
(Subp
))
6385 Form2
:= Next_Formal
(Form2
);
6388 if Present
(Form1
) then
6389 Form1
:= Next_Formal
(Form1
);
6390 Form2
:= Next_Formal
(Form2
);
6393 while Present
(Form1
) loop
6394 if not Is_Controlling_Formal
(Form1
)
6395 and then Present
(Next_Formal
(Form2
))
6396 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
6398 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
6399 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
6401 ("& does not match corresponding formal of&#",
6406 Next_Formal
(Form1
);
6407 Next_Formal
(Form2
);
6412 -- If there is an overridden subprogram, then check that there is no
6413 -- "not overriding" indicator, and mark the subprogram as overriding.
6414 -- This is not done if the overridden subprogram is marked as hidden,
6415 -- which can occur for the case of inherited controlled operations
6416 -- (see Derive_Subprogram), unless the inherited subprogram's parent
6417 -- subprogram is not itself hidden. (Note: This condition could probably
6418 -- be simplified, leaving out the testing for the specific controlled
6419 -- cases, but it seems safer and clearer this way, and echoes similar
6420 -- special-case tests of this kind in other places.)
6422 if Present
(Overridden_Subp
)
6423 and then (not Is_Hidden
(Overridden_Subp
)
6425 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
6428 and then Present
(Alias
(Overridden_Subp
))
6429 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
6431 if Must_Not_Override
(Spec
) then
6432 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
6434 if Ekind
(Subp
) = E_Entry
then
6436 ("entry & overrides inherited operation #", Spec
, Subp
);
6439 ("subprogram & overrides inherited operation #", Spec
, Subp
);
6442 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
6443 -- as an extension of Root_Controlled, and thus has a useless Adjust
6444 -- operation. This operation should not be inherited by other limited
6445 -- controlled types. An explicit Adjust for them is not overriding.
6447 elsif Must_Override
(Spec
)
6448 and then Chars
(Overridden_Subp
) = Name_Adjust
6449 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
6450 and then Present
(Alias
(Overridden_Subp
))
6451 and then In_Predefined_Unit
(Alias
(Overridden_Subp
))
6454 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))));
6455 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6457 elsif Is_Subprogram
(Subp
) then
6458 if Is_Init_Proc
(Subp
) then
6461 elsif No
(Overridden_Operation
(Subp
)) then
6463 -- For entities generated by Derive_Subprograms the overridden
6464 -- operation is the inherited primitive (which is available
6465 -- through the attribute alias)
6467 if (Is_Dispatching_Operation
(Subp
)
6468 or else Is_Dispatching_Operation
(Overridden_Subp
))
6469 and then not Comes_From_Source
(Overridden_Subp
)
6470 and then Find_Dispatching_Type
(Overridden_Subp
) =
6471 Find_Dispatching_Type
(Subp
)
6472 and then Present
(Alias
(Overridden_Subp
))
6473 and then Comes_From_Source
(Alias
(Overridden_Subp
))
6475 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
6476 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
6479 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
6480 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
6485 -- If primitive flag is set or this is a protected operation, then
6486 -- the operation is overriding at the point of its declaration, so
6487 -- warn if necessary. Otherwise it may have been declared before the
6488 -- operation it overrides and no check is required.
6491 and then not Must_Override
(Spec
)
6492 and then (Is_Primitive
6493 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
6495 Style
.Missing_Overriding
(Decl
, Subp
);
6498 -- If Subp is an operator, it may override a predefined operation, if
6499 -- it is defined in the same scope as the type to which it applies.
6500 -- In that case Overridden_Subp is empty because of our implicit
6501 -- representation for predefined operators. We have to check whether the
6502 -- signature of Subp matches that of a predefined operator. Note that
6503 -- first argument provides the name of the operator, and the second
6504 -- argument the signature that may match that of a standard operation.
6505 -- If the indicator is overriding, then the operator must match a
6506 -- predefined signature, because we know already that there is no
6507 -- explicit overridden operation.
6509 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
6510 if Must_Not_Override
(Spec
) then
6512 -- If this is not a primitive or a protected subprogram, then
6513 -- "not overriding" is illegal.
6516 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6518 Error_Msg_N
("overriding indicator only allowed "
6519 & "if subprogram is primitive", Subp
);
6521 elsif Can_Override_Operator
(Subp
) then
6523 ("subprogram& overrides predefined operator ", Spec
, Subp
);
6526 elsif Must_Override
(Spec
) then
6527 if No
(Overridden_Operation
(Subp
))
6528 and then not Can_Override_Operator
(Subp
)
6530 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6533 elsif not Error_Posted
(Subp
)
6534 and then Style_Check
6535 and then Can_Override_Operator
(Subp
)
6536 and then not In_Predefined_Unit
(Subp
)
6538 -- If style checks are enabled, indicate that the indicator is
6539 -- missing. However, at the point of declaration, the type of
6540 -- which this is a primitive operation may be private, in which
6541 -- case the indicator would be premature.
6543 if Has_Private_Declaration
(Etype
(Subp
))
6544 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
6548 Style
.Missing_Overriding
(Decl
, Subp
);
6552 elsif Must_Override
(Spec
) then
6553 if Ekind
(Subp
) = E_Entry
then
6554 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
6556 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6559 -- If the operation is marked "not overriding" and it's not primitive
6560 -- then an error is issued, unless this is an operation of a task or
6561 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
6562 -- has been specified have already been checked above.
6564 elsif Must_Not_Override
(Spec
)
6565 and then not Is_Primitive
6566 and then Ekind
(Subp
) /= E_Entry
6567 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6570 ("overriding indicator only allowed if subprogram is primitive",
6574 end Check_Overriding_Indicator
;
6580 -- Note: this procedure needs to know far too much about how the expander
6581 -- messes with exceptions. The use of the flag Exception_Junk and the
6582 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
6583 -- works, but is not very clean. It would be better if the expansion
6584 -- routines would leave Original_Node working nicely, and we could use
6585 -- Original_Node here to ignore all the peculiar expander messing ???
6587 procedure Check_Returns
6591 Proc
: Entity_Id
:= Empty
)
6595 procedure Check_Statement_Sequence
(L
: List_Id
);
6596 -- Internal recursive procedure to check a list of statements for proper
6597 -- termination by a return statement (or a transfer of control or a
6598 -- compound statement that is itself internally properly terminated).
6600 ------------------------------
6601 -- Check_Statement_Sequence --
6602 ------------------------------
6604 procedure Check_Statement_Sequence
(L
: List_Id
) is
6609 function Assert_False
return Boolean;
6610 -- Returns True if Last_Stm is a pragma Assert (False) that has been
6611 -- rewritten as a null statement when assertions are off. The assert
6612 -- is not active, but it is still enough to kill the warning.
6618 function Assert_False
return Boolean is
6619 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
6622 if Nkind
(Orig
) = N_Pragma
6623 and then Pragma_Name
(Orig
) = Name_Assert
6624 and then not Error_Posted
(Orig
)
6627 Arg
: constant Node_Id
:=
6628 First
(Pragma_Argument_Associations
(Orig
));
6629 Exp
: constant Node_Id
:= Expression
(Arg
);
6631 return Nkind
(Exp
) = N_Identifier
6632 and then Chars
(Exp
) = Name_False
;
6642 Raise_Exception_Call
: Boolean;
6643 -- Set True if statement sequence terminated by Raise_Exception call
6644 -- or a Reraise_Occurrence call.
6646 -- Start of processing for Check_Statement_Sequence
6649 Raise_Exception_Call
:= False;
6651 -- Get last real statement
6653 Last_Stm
:= Last
(L
);
6655 -- Deal with digging out exception handler statement sequences that
6656 -- have been transformed by the local raise to goto optimization.
6657 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
6658 -- optimization has occurred, we are looking at something like:
6661 -- original stmts in block
6665 -- goto L1; | omitted if No_Exception_Propagation
6670 -- goto L3; -- skip handler when exception not raised
6672 -- <<L1>> -- target label for local exception
6686 -- and what we have to do is to dig out the estmts1 and estmts2
6687 -- sequences (which were the original sequences of statements in
6688 -- the exception handlers) and check them.
6690 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
6695 exit when Nkind
(Stm
) /= N_Block_Statement
;
6696 exit when not Exception_Junk
(Stm
);
6699 exit when Nkind
(Stm
) /= N_Label
;
6700 exit when not Exception_Junk
(Stm
);
6701 Check_Statement_Sequence
6702 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
6707 exit when Nkind
(Stm
) /= N_Goto_Statement
;
6708 exit when not Exception_Junk
(Stm
);
6712 -- Don't count pragmas
6714 while Nkind
(Last_Stm
) = N_Pragma
6716 -- Don't count call to SS_Release (can happen after Raise_Exception)
6719 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
6721 Nkind
(Name
(Last_Stm
)) = N_Identifier
6723 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
6725 -- Don't count exception junk
6728 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
6730 N_Object_Declaration
)
6731 and then Exception_Junk
(Last_Stm
))
6732 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
6733 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
6735 -- Inserted code, such as finalization calls, is irrelevant: we only
6736 -- need to check original source.
6738 or else Is_Rewrite_Insertion
(Last_Stm
)
6743 -- Here we have the "real" last statement
6745 Kind
:= Nkind
(Last_Stm
);
6747 -- Transfer of control, OK. Note that in the No_Return procedure
6748 -- case, we already diagnosed any explicit return statements, so
6749 -- we can treat them as OK in this context.
6751 if Is_Transfer
(Last_Stm
) then
6754 -- Check cases of explicit non-indirect procedure calls
6756 elsif Kind
= N_Procedure_Call_Statement
6757 and then Is_Entity_Name
(Name
(Last_Stm
))
6759 -- Check call to Raise_Exception procedure which is treated
6760 -- specially, as is a call to Reraise_Occurrence.
6762 -- We suppress the warning in these cases since it is likely that
6763 -- the programmer really does not expect to deal with the case
6764 -- of Null_Occurrence, and thus would find a warning about a
6765 -- missing return curious, and raising Program_Error does not
6766 -- seem such a bad behavior if this does occur.
6768 -- Note that in the Ada 2005 case for Raise_Exception, the actual
6769 -- behavior will be to raise Constraint_Error (see AI-329).
6771 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
6773 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
6775 Raise_Exception_Call
:= True;
6777 -- For Raise_Exception call, test first argument, if it is
6778 -- an attribute reference for a 'Identity call, then we know
6779 -- that the call cannot possibly return.
6782 Arg
: constant Node_Id
:=
6783 Original_Node
(First_Actual
(Last_Stm
));
6785 if Nkind
(Arg
) = N_Attribute_Reference
6786 and then Attribute_Name
(Arg
) = Name_Identity
6793 -- If statement, need to look inside if there is an else and check
6794 -- each constituent statement sequence for proper termination.
6796 elsif Kind
= N_If_Statement
6797 and then Present
(Else_Statements
(Last_Stm
))
6799 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
6800 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6802 if Present
(Elsif_Parts
(Last_Stm
)) then
6804 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
6807 while Present
(Elsif_Part
) loop
6808 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
6816 -- Case statement, check each case for proper termination
6818 elsif Kind
= N_Case_Statement
then
6822 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6823 while Present
(Case_Alt
) loop
6824 Check_Statement_Sequence
(Statements
(Case_Alt
));
6825 Next_Non_Pragma
(Case_Alt
);
6831 -- Block statement, check its handled sequence of statements
6833 elsif Kind
= N_Block_Statement
then
6839 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6848 -- Loop statement. If there is an iteration scheme, we can definitely
6849 -- fall out of the loop. Similarly if there is an exit statement, we
6850 -- can fall out. In either case we need a following return.
6852 elsif Kind
= N_Loop_Statement
then
6853 if Present
(Iteration_Scheme
(Last_Stm
))
6854 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6858 -- A loop with no exit statement or iteration scheme is either
6859 -- an infinite loop, or it has some other exit (raise/return).
6860 -- In either case, no warning is required.
6866 -- Timed entry call, check entry call and delay alternatives
6868 -- Note: in expanded code, the timed entry call has been converted
6869 -- to a set of expanded statements on which the check will work
6870 -- correctly in any case.
6872 elsif Kind
= N_Timed_Entry_Call
then
6874 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6875 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6878 -- If statement sequence of entry call alternative is missing,
6879 -- then we can definitely fall through, and we post the error
6880 -- message on the entry call alternative itself.
6882 if No
(Statements
(ECA
)) then
6885 -- If statement sequence of delay alternative is missing, then
6886 -- we can definitely fall through, and we post the error
6887 -- message on the delay alternative itself.
6889 -- Note: if both ECA and DCA are missing the return, then we
6890 -- post only one message, should be enough to fix the bugs.
6891 -- If not we will get a message next time on the DCA when the
6894 elsif No
(Statements
(DCA
)) then
6897 -- Else check both statement sequences
6900 Check_Statement_Sequence
(Statements
(ECA
));
6901 Check_Statement_Sequence
(Statements
(DCA
));
6906 -- Conditional entry call, check entry call and else part
6908 -- Note: in expanded code, the conditional entry call has been
6909 -- converted to a set of expanded statements on which the check
6910 -- will work correctly in any case.
6912 elsif Kind
= N_Conditional_Entry_Call
then
6914 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6917 -- If statement sequence of entry call alternative is missing,
6918 -- then we can definitely fall through, and we post the error
6919 -- message on the entry call alternative itself.
6921 if No
(Statements
(ECA
)) then
6924 -- Else check statement sequence and else part
6927 Check_Statement_Sequence
(Statements
(ECA
));
6928 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6934 -- If we fall through, issue appropriate message
6938 -- Kill warning if last statement is a raise exception call,
6939 -- or a pragma Assert (False). Note that with assertions enabled,
6940 -- such a pragma has been converted into a raise exception call
6941 -- already, so the Assert_False is for the assertions off case.
6943 if not Raise_Exception_Call
and then not Assert_False
then
6945 -- In GNATprove mode, it is an error to have a missing return
6947 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6949 -- Issue error message or warning
6952 ("RETURN statement missing following this statement<<!",
6955 ("\Program_Error ]<<!", Last_Stm
);
6958 -- Note: we set Err even though we have not issued a warning
6959 -- because we still have a case of a missing return. This is
6960 -- an extremely marginal case, probably will never be noticed
6961 -- but we might as well get it right.
6965 -- Otherwise we have the case of a procedure marked No_Return
6968 if not Raise_Exception_Call
then
6969 if GNATprove_Mode
then
6971 ("implied return after this statement would have raised "
6972 & "Program_Error", Last_Stm
);
6974 -- In normal compilation mode, do not warn on a generated call
6975 -- (e.g. in the body of a renaming as completion).
6977 elsif Comes_From_Source
(Last_Stm
) then
6979 ("implied return after this statement will raise "
6980 & "Program_Error??", Last_Stm
);
6983 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6985 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6989 RE
: constant Node_Id
:=
6990 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6991 Reason
=> PE_Implicit_Return
);
6993 Insert_After
(Last_Stm
, RE
);
6997 end Check_Statement_Sequence
;
6999 -- Start of processing for Check_Returns
7003 Check_Statement_Sequence
(Statements
(HSS
));
7005 if Present
(Exception_Handlers
(HSS
)) then
7006 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
7007 while Present
(Handler
) loop
7008 Check_Statement_Sequence
(Statements
(Handler
));
7009 Next_Non_Pragma
(Handler
);
7014 ----------------------------
7015 -- Check_Subprogram_Order --
7016 ----------------------------
7018 procedure Check_Subprogram_Order
(N
: Node_Id
) is
7020 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
7021 -- This is used to check if S1 > S2 in the sense required by this test,
7022 -- for example nameab < namec, but name2 < name10.
7024 -----------------------------
7025 -- Subprogram_Name_Greater --
7026 -----------------------------
7028 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
7033 -- Deal with special case where names are identical except for a
7034 -- numerical suffix. These are handled specially, taking the numeric
7035 -- ordering from the suffix into account.
7038 while S1
(L1
) in '0' .. '9' loop
7043 while S2
(L2
) in '0' .. '9' loop
7047 -- If non-numeric parts non-equal, do straight compare
7049 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
7052 -- If non-numeric parts equal, compare suffixed numeric parts. Note
7053 -- that a missing suffix is treated as numeric zero in this test.
7057 while L1
< S1
'Last loop
7059 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
7063 while L2
< S2
'Last loop
7065 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
7070 end Subprogram_Name_Greater
;
7072 -- Start of processing for Check_Subprogram_Order
7075 -- Check body in alpha order if this is option
7078 and then Style_Check_Order_Subprograms
7079 and then Nkind
(N
) = N_Subprogram_Body
7080 and then Comes_From_Source
(N
)
7081 and then In_Extended_Main_Source_Unit
(N
)
7085 renames Scope_Stack
.Table
7086 (Scope_Stack
.Last
).Last_Subprogram_Name
;
7088 Body_Id
: constant Entity_Id
:=
7089 Defining_Entity
(Specification
(N
));
7092 Get_Decoded_Name_String
(Chars
(Body_Id
));
7095 if Subprogram_Name_Greater
7096 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
7098 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
7104 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
7107 end Check_Subprogram_Order;
7109 ------------------------------
7110 -- Check_Subtype_Conformant --
7111 ------------------------------
7113 procedure Check_Subtype_Conformant
7114 (New_Id : Entity_Id;
7116 Err_Loc : Node_Id := Empty;
7117 Skip_Controlling_Formals : Boolean := False;
7118 Get_Inst : Boolean := False)
7121 pragma Warnings (Off, Result);
7124 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
7125 Skip_Controlling_Formals => Skip_Controlling_Formals,
7126 Get_Inst => Get_Inst);
7127 end Check_Subtype_Conformant;
7129 -----------------------------------
7130 -- Check_Synchronized_Overriding --
7131 -----------------------------------
7133 procedure Check_Synchronized_Overriding
7134 (Def_Id : Entity_Id;
7135 Overridden_Subp : out Entity_Id)
7137 Ifaces_List : Elist_Id;
7141 function Matches_Prefixed_View_Profile
7142 (Prim_Params : List_Id;
7143 Iface_Params : List_Id) return Boolean;
7144 -- Determine whether a subprogram's parameter profile Prim_Params
7145 -- matches that of a potentially overridden interface subprogram
7146 -- Iface_Params. Also determine if the type of first parameter of
7147 -- Iface_Params is an implemented interface.
7149 -----------------------------------
7150 -- Matches_Prefixed_View_Profile --
7151 -----------------------------------
7153 function Matches_Prefixed_View_Profile
7154 (Prim_Params : List_Id;
7155 Iface_Params : List_Id) return Boolean
7157 function Is_Implemented
7158 (Ifaces_List : Elist_Id;
7159 Iface : Entity_Id) return Boolean;
7160 -- Determine if Iface is implemented by the current task or
7163 --------------------
7164 -- Is_Implemented --
7165 --------------------
7167 function Is_Implemented
7168 (Ifaces_List : Elist_Id;
7169 Iface : Entity_Id) return Boolean
7171 Iface_Elmt : Elmt_Id;
7174 Iface_Elmt := First_Elmt (Ifaces_List);
7175 while Present (Iface_Elmt) loop
7176 if Node (Iface_Elmt) = Iface then
7180 Next_Elmt (Iface_Elmt);
7188 Iface_Id : Entity_Id;
7189 Iface_Param : Node_Id;
7190 Iface_Typ : Entity_Id;
7191 Prim_Id : Entity_Id;
7192 Prim_Param : Node_Id;
7193 Prim_Typ : Entity_Id;
7195 -- Start of processing for Matches_Prefixed_View_Profile
7198 Iface_Param := First (Iface_Params);
7199 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
7201 if Is_Access_Type (Iface_Typ) then
7202 Iface_Typ := Designated_Type (Iface_Typ);
7205 Prim_Param := First (Prim_Params);
7207 -- The first parameter of the potentially overridden subprogram must
7208 -- be an interface implemented by Prim.
7210 if not Is_Interface (Iface_Typ)
7211 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7216 -- The checks on the object parameters are done, so move on to the
7217 -- rest of the parameters.
7219 if not In_Scope then
7220 Prim_Param := Next (Prim_Param);
7223 Iface_Param := Next (Iface_Param);
7224 while Present (Iface_Param) and then Present (Prim_Param) loop
7225 Iface_Id := Defining_Identifier (Iface_Param);
7226 Iface_Typ := Find_Parameter_Type (Iface_Param);
7228 Prim_Id := Defining_Identifier (Prim_Param);
7229 Prim_Typ := Find_Parameter_Type (Prim_Param);
7231 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7232 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7233 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7235 Iface_Typ := Designated_Type (Iface_Typ);
7236 Prim_Typ := Designated_Type (Prim_Typ);
7239 -- Case of multiple interface types inside a parameter profile
7241 -- (Obj_Param : in out Iface; ...; Param : Iface)
7243 -- If the interface type is implemented, then the matching type in
7244 -- the primitive should be the implementing record type.
7246 if Ekind (Iface_Typ) = E_Record_Type
7247 and then Is_Interface (Iface_Typ)
7248 and then Is_Implemented (Ifaces_List, Iface_Typ)
7250 if Prim_Typ /= Typ then
7254 -- The two parameters must be both mode and subtype conformant
7256 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7258 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7267 -- One of the two lists contains more parameters than the other
7269 if Present (Iface_Param) or else Present (Prim_Param) then
7274 end Matches_Prefixed_View_Profile;
7276 -- Start of processing for Check_Synchronized_Overriding
7279 Overridden_Subp := Empty;
7281 -- Def_Id must be an entry or a subprogram. We should skip predefined
7282 -- primitives internally generated by the front end; however at this
7283 -- stage predefined primitives are still not fully decorated. As a
7284 -- minor optimization we skip here internally generated subprograms.
7286 if (Ekind (Def_Id) /= E_Entry
7287 and then Ekind (Def_Id) /= E_Function
7288 and then Ekind (Def_Id) /= E_Procedure)
7289 or else not Comes_From_Source (Def_Id)
7294 -- Search for the concurrent declaration since it contains the list of
7295 -- all implemented interfaces. In this case, the subprogram is declared
7296 -- within the scope of a protected or a task type.
7298 if Present (Scope (Def_Id))
7299 and then Is_Concurrent_Type (Scope (Def_Id))
7300 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7302 Typ := Scope (Def_Id);
7305 -- The enclosing scope is not a synchronized type and the subprogram
7308 elsif No (First_Formal (Def_Id)) then
7311 -- The subprogram has formals and hence it may be a primitive of a
7315 Typ := Etype (First_Formal (Def_Id));
7317 if Is_Access_Type (Typ) then
7318 Typ := Directly_Designated_Type (Typ);
7321 if Is_Concurrent_Type (Typ)
7322 and then not Is_Generic_Actual_Type (Typ)
7326 -- This case occurs when the concurrent type is declared within a
7327 -- generic unit. As a result the corresponding record has been built
7328 -- and used as the type of the first formal, we just have to retrieve
7329 -- the corresponding concurrent type.
7331 elsif Is_Concurrent_Record_Type (Typ)
7332 and then not Is_Class_Wide_Type (Typ)
7333 and then Present (Corresponding_Concurrent_Type (Typ))
7335 Typ := Corresponding_Concurrent_Type (Typ);
7343 -- There is no overriding to check if this is an inherited operation in
7344 -- a type derivation for a generic actual.
7346 Collect_Interfaces (Typ, Ifaces_List);
7348 if Is_Empty_Elmt_List (Ifaces_List) then
7352 -- Determine whether entry or subprogram Def_Id overrides a primitive
7353 -- operation that belongs to one of the interfaces in Ifaces_List.
7356 Candidate : Entity_Id := Empty;
7357 Hom : Entity_Id := Empty;
7358 Subp : Entity_Id := Empty;
7361 -- Traverse the homonym chain, looking for a potentially overridden
7362 -- subprogram that belongs to an implemented interface.
7364 Hom := Current_Entity_In_Scope (Def_Id);
7365 while Present (Hom) loop
7369 or else not Is_Overloadable (Subp)
7370 or else not Is_Primitive (Subp)
7371 or else not Is_Dispatching_Operation (Subp)
7372 or else not Present (Find_Dispatching_Type (Subp))
7373 or else not Is_Interface (Find_Dispatching_Type (Subp))
7377 -- Entries and procedures can override abstract or null interface
7380 elsif Ekind_In (Def_Id, E_Entry, E_Procedure)
7381 and then Ekind (Subp) = E_Procedure
7382 and then Matches_Prefixed_View_Profile
7383 (Parameter_Specifications (Parent (Def_Id)),
7384 Parameter_Specifications (Parent (Subp)))
7388 -- For an overridden subprogram Subp, check whether the mode
7389 -- of its first parameter is correct depending on the kind of
7390 -- synchronized type.
7393 Formal : constant Node_Id := First_Formal (Candidate);
7396 -- In order for an entry or a protected procedure to
7397 -- override, the first parameter of the overridden routine
7398 -- must be of mode "out", "in out", or access-to-variable.
7400 if Ekind_In (Candidate, E_Entry, E_Procedure)
7401 and then Is_Protected_Type (Typ)
7402 and then Ekind (Formal) /= E_In_Out_Parameter
7403 and then Ekind (Formal) /= E_Out_Parameter
7404 and then Nkind (Parameter_Type (Parent (Formal))) /=
7409 -- All other cases are OK since a task entry or routine does
7410 -- not have a restriction on the mode of the first parameter
7411 -- of the overridden interface routine.
7414 Overridden_Subp := Candidate;
7419 -- Functions can override abstract interface functions
7421 elsif Ekind (Def_Id) = E_Function
7422 and then Ekind (Subp) = E_Function
7423 and then Matches_Prefixed_View_Profile
7424 (Parameter_Specifications (Parent (Def_Id)),
7425 Parameter_Specifications (Parent (Subp)))
7426 and then Etype (Def_Id) = Etype (Subp)
7430 -- If an inherited subprogram is implemented by a protected
7431 -- function, then the first parameter of the inherited
7432 -- subprogram shall be of mode in, but not an access-to-
7433 -- variable parameter (RM 9.4(11/9)).
7435 if Present (First_Formal (Subp))
7436 and then Ekind (First_Formal (Subp)) = E_In_Parameter
7438 (not Is_Access_Type (Etype (First_Formal (Subp)))
7440 Is_Access_Constant (Etype (First_Formal (Subp))))
7442 Overridden_Subp := Subp;
7447 Hom := Homonym (Hom);
7450 -- After examining all candidates for overriding, we are left with
7451 -- the best match, which is a mode-incompatible interface routine.
7453 if In_Scope and then Present (Candidate) then
7454 Error_Msg_PT (Def_Id, Candidate);
7457 Overridden_Subp := Candidate;
7460 end Check_Synchronized_Overriding;
7462 ---------------------------
7463 -- Check_Type_Conformant --
7464 ---------------------------
7466 procedure Check_Type_Conformant
7467 (New_Id : Entity_Id;
7469 Err_Loc : Node_Id := Empty)
7472 pragma Warnings (Off, Result);
7475 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
7476 end Check_Type_Conformant;
7478 ---------------------------
7479 -- Can_Override_Operator --
7480 ---------------------------
7482 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
7486 if Nkind (Subp) /= N_Defining_Operator_Symbol then
7490 Typ := Base_Type (Etype (First_Formal (Subp)));
7492 -- Check explicitly that the operation is a primitive of the type
7494 return Operator_Matches_Spec (Subp, Subp)
7495 and then not Is_Generic_Type (Typ)
7496 and then Scope (Subp) = Scope (Typ)
7497 and then not Is_Class_Wide_Type (Typ);
7499 end Can_Override_Operator;
7501 ----------------------
7502 -- Conforming_Types --
7503 ----------------------
7505 function Conforming_Types
7508 Ctype : Conformance_Type;
7509 Get_Inst : Boolean := False) return Boolean
7511 function Base_Types_Match
7513 Typ_2 : Entity_Id) return Boolean;
7514 -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are
7515 -- in different scopes (e.g. parent and child instances), then verify
7516 -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on
7517 -- the same subtype chain. The whole purpose of this procedure is to
7518 -- prevent spurious ambiguities in an instantiation that may arise if
7519 -- two distinct generic types are instantiated with the same actual.
7521 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id;
7522 -- An access parameter can designate an incomplete type. If the
7523 -- incomplete type is the limited view of a type from a limited_
7524 -- with_clause, check whether the non-limited view is available.
7525 -- If it is a (non-limited) incomplete type, get the full view.
7527 function Matches_Limited_With_View
7529 Typ_2 : Entity_Id) return Boolean;
7530 -- Returns True if and only if either Typ_1 denotes a limited view of
7531 -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when
7532 -- the limited with view of a type is used in a subprogram declaration
7533 -- and the subprogram body is in the scope of a regular with clause for
7534 -- the same unit. In such a case, the two type entities are considered
7535 -- identical for purposes of conformance checking.
7537 ----------------------
7538 -- Base_Types_Match --
7539 ----------------------
7541 function Base_Types_Match
7543 Typ_2 : Entity_Id) return Boolean
7545 Base_1 : constant Entity_Id := Base_Type (Typ_1);
7546 Base_2 : constant Entity_Id := Base_Type (Typ_2);
7549 if Typ_1 = Typ_2 then
7552 elsif Base_1 = Base_2 then
7554 -- The following is too permissive. A more precise test should
7555 -- check that the generic actual is an ancestor subtype of the
7558 -- See code in Find_Corresponding_Spec that applies an additional
7559 -- filter to handle accidental amiguities in instances.
7562 not Is_Generic_Actual_Type (Typ_1)
7563 or else not Is_Generic_Actual_Type (Typ_2)
7564 or else Scope (Typ_1) /= Scope (Typ_2);
7566 -- If Typ_2 is a generic actual type it is declared as the subtype of
7567 -- the actual. If that actual is itself a subtype we need to use its
7568 -- own base type to check for compatibility.
7570 elsif Ekind (Base_2) = Ekind (Typ_2)
7571 and then Base_1 = Base_Type (Base_2)
7575 elsif Ekind (Base_1) = Ekind (Typ_1)
7576 and then Base_2 = Base_Type (Base_1)
7583 end Base_Types_Match;
7585 --------------------------
7586 -- Find_Designated_Type --
7587 --------------------------
7589 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is
7593 Desig := Directly_Designated_Type (Typ);
7595 if Ekind (Desig) = E_Incomplete_Type then
7597 -- If regular incomplete type, get full view if available
7599 if Present (Full_View (Desig)) then
7600 Desig := Full_View (Desig);
7602 -- If limited view of a type, get non-limited view if available,
7603 -- and check again for a regular incomplete type.
7605 elsif Present (Non_Limited_View (Desig)) then
7606 Desig := Get_Full_View (Non_Limited_View (Desig));
7611 end Find_Designated_Type;
7613 -------------------------------
7614 -- Matches_Limited_With_View --
7615 -------------------------------
7617 function Matches_Limited_With_View
7619 Typ_2 : Entity_Id) return Boolean
7621 function Is_Matching_Limited_View
7623 View : Entity_Id) return Boolean;
7624 -- Determine whether non-limited view View denotes type Typ in some
7625 -- conformant fashion.
7627 ------------------------------
7628 -- Is_Matching_Limited_View --
7629 ------------------------------
7631 function Is_Matching_Limited_View
7633 View : Entity_Id) return Boolean
7635 Root_Typ : Entity_Id;
7636 Root_View : Entity_Id;
7639 -- The non-limited view directly denotes the type
7644 -- The type is a subtype of the non-limited view
7646 elsif Is_Subtype_Of (Typ, View) then
7649 -- Both the non-limited view and the type denote class-wide types
7651 elsif Is_Class_Wide_Type (Typ)
7652 and then Is_Class_Wide_Type (View)
7654 Root_Typ := Root_Type (Typ);
7655 Root_View := Root_Type (View);
7657 if Root_Typ = Root_View then
7660 -- An incomplete tagged type and its full view may receive two
7661 -- distinct class-wide types when the related package has not
7662 -- been analyzed yet.
7665 -- type T is tagged; -- CW_1
7666 -- type T is tagged null record; -- CW_2
7669 -- This is because the package lacks any semantic information
7670 -- that may eventually link both views of T. As a consequence,
7671 -- a client of the limited view of Pack will see CW_2 while a
7672 -- client of the non-limited view of Pack will see CW_1.
7674 elsif Is_Incomplete_Type (Root_Typ)
7675 and then Present (Full_View (Root_Typ))
7676 and then Full_View (Root_Typ) = Root_View
7680 elsif Is_Incomplete_Type (Root_View)
7681 and then Present (Full_View (Root_View))
7682 and then Full_View (Root_View) = Root_Typ
7689 end Is_Matching_Limited_View;
7691 -- Start of processing for Matches_Limited_With_View
7694 -- In some cases a type imported through a limited_with clause, and
7695 -- its non-limited view are both visible, for example in an anonymous
7696 -- access-to-class-wide type in a formal, or when building the body
7697 -- for a subprogram renaming after the subprogram has been frozen.
7698 -- In these cases both entities designate the same type. In addition,
7699 -- if one of them is an actual in an instance, it may be a subtype of
7700 -- the non-limited view of the other.
7702 if From_Limited_With (Typ_1)
7703 and then From_Limited_With (Typ_2)
7704 and then Available_View (Typ_1) = Available_View (Typ_2)
7708 elsif From_Limited_With (Typ_1) then
7709 return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1));
7711 elsif From_Limited_With (Typ_2) then
7712 return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2));
7717 end Matches_Limited_With_View;
7721 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
7723 Type_1 : Entity_Id := T1;
7724 Type_2 : Entity_Id := T2;
7726 -- Start of processing for Conforming_Types
7729 -- The context is an instance association for a formal access-to-
7730 -- subprogram type; the formal parameter types require mapping because
7731 -- they may denote other formal parameters of the generic unit.
7734 Type_1 := Get_Instance_Of (T1);
7735 Type_2 := Get_Instance_Of (T2);
7738 -- If one of the types is a view of the other introduced by a limited
7739 -- with clause, treat these as conforming for all purposes.
7741 if Matches_Limited_With_View (T1, T2) then
7744 elsif Base_Types_Match (Type_1, Type_2) then
7745 if Ctype <= Mode_Conformant then
7750 Subtypes_Statically_Match (Type_1, Type_2)
7751 and then Dimensions_Match (Type_1, Type_2);
7754 elsif Is_Incomplete_Or_Private_Type (Type_1)
7755 and then Present (Full_View (Type_1))
7756 and then Base_Types_Match (Full_View (Type_1), Type_2)
7759 Ctype <= Mode_Conformant
7760 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
7762 elsif Ekind (Type_2) = E_Incomplete_Type
7763 and then Present (Full_View (Type_2))
7764 and then Base_Types_Match (Type_1, Full_View (Type_2))
7767 Ctype <= Mode_Conformant
7768 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7770 elsif Is_Private_Type (Type_2)
7771 and then In_Instance
7772 and then Present (Full_View (Type_2))
7773 and then Base_Types_Match (Type_1, Full_View (Type_2))
7776 Ctype <= Mode_Conformant
7777 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7779 -- Another confusion between views in a nested instance with an
7780 -- actual private type whose full view is not in scope.
7782 elsif Ekind (Type_2) = E_Private_Subtype
7783 and then In_Instance
7784 and then Etype (Type_2) = Type_1
7788 -- In Ada 2012, incomplete types (including limited views) can appear
7789 -- as actuals in instantiations, where they are conformant to the
7790 -- corresponding incomplete formal.
7792 elsif Is_Incomplete_Type (Type_1)
7793 and then Is_Incomplete_Type (Type_2)
7794 and then In_Instance
7795 and then (Used_As_Generic_Actual (Type_1)
7796 or else Used_As_Generic_Actual (Type_2))
7801 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
7802 -- treated recursively because they carry a signature. As far as
7803 -- conformance is concerned, convention plays no role, and either
7804 -- or both could be access to protected subprograms.
7806 Are_Anonymous_Access_To_Subprogram_Types :=
7807 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
7808 E_Anonymous_Access_Protected_Subprogram_Type)
7810 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
7811 E_Anonymous_Access_Protected_Subprogram_Type);
7813 -- Test anonymous access type case. For this case, static subtype
7814 -- matching is required for mode conformance (RM 6.3.1(15)). We check
7815 -- the base types because we may have built internal subtype entities
7816 -- to handle null-excluding types (see Process_Formals).
7818 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
7820 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
7822 -- Ada 2005 (AI-254)
7824 or else Are_Anonymous_Access_To_Subprogram_Types
7827 Desig_1 : Entity_Id;
7828 Desig_2 : Entity_Id;
7831 -- In Ada 2005, access constant indicators must match for
7832 -- subtype conformance.
7834 if Ada_Version >= Ada_2005
7835 and then Ctype >= Subtype_Conformant
7837 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
7842 Desig_1 := Find_Designated_Type (Type_1);
7843 Desig_2 := Find_Designated_Type (Type_2);
7845 -- If the context is an instance association for a formal
7846 -- access-to-subprogram type; formal access parameter designated
7847 -- types require mapping because they may denote other formal
7848 -- parameters of the generic unit.
7851 Desig_1 := Get_Instance_Of (Desig_1);
7852 Desig_2 := Get_Instance_Of (Desig_2);
7855 -- It is possible for a Class_Wide_Type to be introduced for an
7856 -- incomplete type, in which case there is a separate class_ wide
7857 -- type for the full view. The types conform if their Etypes
7858 -- conform, i.e. one may be the full view of the other. This can
7859 -- only happen in the context of an access parameter, other uses
7860 -- of an incomplete Class_Wide_Type are illegal.
7862 if Is_Class_Wide_Type (Desig_1)
7864 Is_Class_Wide_Type (Desig_2)
7868 (Etype (Base_Type (Desig_1)),
7869 Etype (Base_Type (Desig_2)), Ctype);
7871 elsif Are_Anonymous_Access_To_Subprogram_Types then
7872 if Ada_Version < Ada_2005 then
7874 Ctype = Type_Conformant
7875 or else Subtypes_Statically_Match (Desig_1, Desig_2);
7877 -- We must check the conformance of the signatures themselves
7881 Conformant : Boolean;
7884 (Desig_1, Desig_2, Ctype, False, Conformant);
7889 -- A limited view of an actual matches the corresponding
7890 -- incomplete formal.
7892 elsif Ekind (Desig_2) = E_Incomplete_Subtype
7893 and then From_Limited_With (Desig_2)
7894 and then Used_As_Generic_Actual (Etype (Desig_2))
7899 return Base_Type (Desig_1) = Base_Type (Desig_2)
7900 and then (Ctype = Type_Conformant
7902 Subtypes_Statically_Match (Desig_1, Desig_2));
7906 -- Otherwise definitely no match
7909 if ((Ekind (Type_1) = E_Anonymous_Access_Type
7910 and then Is_Access_Type (Type_2))
7911 or else (Ekind (Type_2) = E_Anonymous_Access_Type
7912 and then Is_Access_Type (Type_1)))
7915 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
7917 May_Hide_Profile := True;
7922 end Conforming_Types;
7924 --------------------------
7925 -- Create_Extra_Formals --
7926 --------------------------
7928 procedure Create_Extra_Formals (E : Entity_Id) is
7929 First_Extra : Entity_Id := Empty;
7931 Last_Extra : Entity_Id := Empty;
7933 function Add_Extra_Formal
7934 (Assoc_Entity : Entity_Id;
7937 Suffix : String) return Entity_Id;
7938 -- Add an extra formal to the current list of formals and extra formals.
7939 -- The extra formal is added to the end of the list of extra formals,
7940 -- and also returned as the result. These formals are always of mode IN.
7941 -- The new formal has the type Typ, is declared in Scope, and its name
7942 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
7943 -- The following suffixes are currently used. They should not be changed
7944 -- without coordinating with CodePeer, which makes use of these to
7945 -- provide better messages.
7947 -- O denotes the Constrained bit.
7948 -- L denotes the accessibility level.
7949 -- BIP_xxx denotes an extra formal for a build-in-place function. See
7950 -- the full list in exp_ch6.BIP_Formal_Kind.
7952 ----------------------
7953 -- Add_Extra_Formal --
7954 ----------------------
7956 function Add_Extra_Formal
7957 (Assoc_Entity : Entity_Id;
7960 Suffix : String) return Entity_Id
7962 EF : constant Entity_Id :=
7963 Make_Defining_Identifier (Sloc (Assoc_Entity),
7964 Chars => New_External_Name (Chars (Assoc_Entity),
7968 -- A little optimization. Never generate an extra formal for the
7969 -- _init operand of an initialization procedure, since it could
7972 if Chars (Formal) = Name_uInit then
7976 Set_Ekind (EF, E_In_Parameter);
7977 Set_Actual_Subtype (EF, Typ);
7978 Set_Etype (EF, Typ);
7979 Set_Scope (EF, Scope);
7980 Set_Mechanism (EF, Default_Mechanism);
7981 Set_Formal_Validity (EF);
7983 if No (First_Extra) then
7985 Set_Extra_Formals (Scope, EF);
7988 if Present (Last_Extra) then
7989 Set_Extra_Formal (Last_Extra, EF);
7995 end Add_Extra_Formal;
7999 Formal_Type : Entity_Id;
8000 P_Formal : Entity_Id := Empty;
8002 -- Start of processing for Create_Extra_Formals
8005 -- We never generate extra formals if expansion is not active because we
8006 -- don't need them unless we are generating code.
8008 if not Expander_Active then
8012 -- No need to generate extra formals in interface thunks whose target
8013 -- primitive has no extra formals.
8015 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
8019 -- If this is a derived subprogram then the subtypes of the parent
8020 -- subprogram's formal parameters will be used to determine the need
8021 -- for extra formals.
8023 if Is_Overloadable (E) and then Present (Alias (E)) then
8024 P_Formal := First_Formal (Alias (E));
8027 Formal := First_Formal (E);
8028 while Present (Formal) loop
8029 Last_Extra := Formal;
8030 Next_Formal (Formal);
8033 -- If Extra_Formals were already created, don't do it again. This
8034 -- situation may arise for subprogram types created as part of
8035 -- dispatching calls (see Expand_Dispatching_Call).
8037 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
8041 -- If the subprogram is a predefined dispatching subprogram then don't
8042 -- generate any extra constrained or accessibility level formals. In
8043 -- general we suppress these for internal subprograms (by not calling
8044 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
8045 -- generated stream attributes do get passed through because extra
8046 -- build-in-place formals are needed in some cases (limited 'Input
).
8048 if Is_Predefined_Internal_Operation
(E
) then
8049 goto Test_For_Func_Result_Extras
;
8052 Formal
:= First_Formal
(E
);
8053 while Present
(Formal
) loop
8055 -- Create extra formal for supporting the attribute 'Constrained.
8056 -- The case of a private type view without discriminants also
8057 -- requires the extra formal if the underlying type has defaulted
8060 if Ekind
(Formal
) /= E_In_Parameter
then
8061 if Present
(P_Formal
) then
8062 Formal_Type
:= Etype
(P_Formal
);
8064 Formal_Type
:= Etype
(Formal
);
8067 -- Do not produce extra formals for Unchecked_Union parameters.
8068 -- Jump directly to the end of the loop.
8070 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
8071 goto Skip_Extra_Formal_Generation
;
8074 if not Has_Discriminants
(Formal_Type
)
8075 and then Ekind
(Formal_Type
) in Private_Kind
8076 and then Present
(Underlying_Type
(Formal_Type
))
8078 Formal_Type
:= Underlying_Type
(Formal_Type
);
8081 -- Suppress the extra formal if formal's subtype is constrained or
8082 -- indefinite, or we're compiling for Ada 2012 and the underlying
8083 -- type is tagged and limited. In Ada 2012, a limited tagged type
8084 -- can have defaulted discriminants, but 'Constrained is required
8085 -- to return True, so the formal is never needed (see AI05-0214).
8086 -- Note that this ensures consistency of calling sequences for
8087 -- dispatching operations when some types in a class have defaults
8088 -- on discriminants and others do not (and requiring the extra
8089 -- formal would introduce distributed overhead).
8091 -- If the type does not have a completion yet, treat as prior to
8092 -- Ada 2012 for consistency.
8094 if Has_Discriminants
(Formal_Type
)
8095 and then not Is_Constrained
(Formal_Type
)
8096 and then Is_Definite_Subtype
(Formal_Type
)
8097 and then (Ada_Version
< Ada_2012
8098 or else No
(Underlying_Type
(Formal_Type
))
8100 (Is_Limited_Type
(Formal_Type
)
8103 (Underlying_Type
(Formal_Type
)))))
8105 Set_Extra_Constrained
8106 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
8110 -- Create extra formal for supporting accessibility checking. This
8111 -- is done for both anonymous access formals and formals of named
8112 -- access types that are marked as controlling formals. The latter
8113 -- case can occur when Expand_Dispatching_Call creates a subprogram
8114 -- type and substitutes the types of access-to-class-wide actuals
8115 -- for the anonymous access-to-specific-type of controlling formals.
8116 -- Base_Type is applied because in cases where there is a null
8117 -- exclusion the formal may have an access subtype.
8119 -- This is suppressed if we specifically suppress accessibility
8120 -- checks at the package level for either the subprogram, or the
8121 -- package in which it resides. However, we do not suppress it
8122 -- simply if the scope has accessibility checks suppressed, since
8123 -- this could cause trouble when clients are compiled with a
8124 -- different suppression setting. The explicit checks at the
8125 -- package level are safe from this point of view.
8127 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
8128 or else (Is_Controlling_Formal
(Formal
)
8129 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
8131 (Explicit_Suppress
(E
, Accessibility_Check
)
8133 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
8136 or else Present
(Extra_Accessibility
(P_Formal
)))
8138 Set_Extra_Accessibility
8139 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
8142 -- This label is required when skipping extra formal generation for
8143 -- Unchecked_Union parameters.
8145 <<Skip_Extra_Formal_Generation
>>
8147 if Present
(P_Formal
) then
8148 Next_Formal
(P_Formal
);
8151 Next_Formal
(Formal
);
8154 <<Test_For_Func_Result_Extras
>>
8156 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
8157 -- function call is ... determined by the point of call ...".
8159 if Needs_Result_Accessibility_Level
(E
) then
8160 Set_Extra_Accessibility_Of_Result
8161 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
8164 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
8165 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
8167 if Is_Build_In_Place_Function
(E
) then
8169 Result_Subt
: constant Entity_Id
:= Etype
(E
);
8170 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
8171 Formal_Typ
: Entity_Id
;
8172 Subp_Decl
: Node_Id
;
8173 Discard
: Entity_Id
;
8176 -- In the case of functions with unconstrained result subtypes,
8177 -- add a 4-state formal indicating whether the return object is
8178 -- allocated by the caller (1), or should be allocated by the
8179 -- callee on the secondary stack (2), in the global heap (3), or
8180 -- in a user-defined storage pool (4). For the moment we just use
8181 -- Natural for the type of this formal. Note that this formal
8182 -- isn't usually needed in the case where the result subtype is
8183 -- constrained, but it is needed when the function has a tagged
8184 -- result, because generally such functions can be called in a
8185 -- dispatching context and such calls must be handled like calls
8186 -- to a class-wide function.
8188 if Needs_BIP_Alloc_Form
(E
) then
8191 (E
, Standard_Natural
,
8192 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
8194 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
8195 -- use a user-defined pool. This formal is not added on
8196 -- ZFP as those targets do not support pools.
8198 if RTE_Available
(RE_Root_Storage_Pool_Ptr
) then
8201 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
8202 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
8206 -- In the case of functions whose result type needs finalization,
8207 -- add an extra formal which represents the finalization master.
8209 if Needs_BIP_Finalization_Master
(E
) then
8212 (E
, RTE
(RE_Finalization_Master_Ptr
),
8213 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
8216 -- When the result type contains tasks, add two extra formals: the
8217 -- master of the tasks to be created, and the caller's activation
8220 if Has_Task
(Full_Subt
) then
8223 (E
, RTE
(RE_Master_Id
),
8224 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
8227 (E
, RTE
(RE_Activation_Chain_Access
),
8228 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
8231 -- All build-in-place functions get an extra formal that will be
8232 -- passed the address of the return object within the caller.
8235 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
8237 -- Incomplete_View_From_Limited_With is needed here because
8238 -- gigi gets confused if the designated type is the full view
8239 -- coming from a limited-with'ed package. In the normal case,
8240 -- (no limited with) Incomplete_View_From_Limited_With
8241 -- returns Result_Subt.
8243 Set_Directly_Designated_Type
8244 (Formal_Typ
, Incomplete_View_From_Limited_With
(Result_Subt
));
8245 Set_Etype
(Formal_Typ
, Formal_Typ
);
8246 Set_Depends_On_Private
8247 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
8248 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
8249 Set_Is_Access_Constant
(Formal_Typ
, False);
8251 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
8252 -- the designated type comes from the limited view (for back-end
8255 Set_From_Limited_With
8256 (Formal_Typ
, From_Limited_With
(Result_Subt
));
8258 Layout_Type
(Formal_Typ
);
8260 -- Force the definition of the Itype in case of internal function
8261 -- calls within the same or nested scope.
8263 if Is_Subprogram_Or_Generic_Subprogram
(E
) then
8264 Subp_Decl
:= Parent
(E
);
8266 -- The insertion point for an Itype reference should be after
8267 -- the unit declaration node of the subprogram. An exception
8268 -- to this are inherited operations from a parent type in which
8269 -- case the derived type acts as their parent.
8271 if Nkind_In
(Subp_Decl
, N_Function_Specification
,
8272 N_Procedure_Specification
)
8274 Subp_Decl
:= Parent
(Subp_Decl
);
8277 Build_Itype_Reference
(Formal_Typ
, Subp_Decl
);
8282 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
8286 -- If this is an instance of a generic, we need to have extra formals
8289 if Is_Generic_Instance
(E
) and then Present
(Alias
(E
)) then
8290 Set_Extra_Formals
(Alias
(E
), Extra_Formals
(E
));
8292 end Create_Extra_Formals
;
8294 -----------------------------
8295 -- Enter_Overloaded_Entity --
8296 -----------------------------
8298 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
8299 function Matches_Predefined_Op
return Boolean;
8300 -- This returns an approximation of whether S matches a predefined
8301 -- operator, based on the operator symbol, and the parameter and result
8302 -- types. The rules are scattered throughout chapter 4 of the Ada RM.
8304 ---------------------------
8305 -- Matches_Predefined_Op --
8306 ---------------------------
8308 function Matches_Predefined_Op
return Boolean is
8309 Formal_1
: constant Entity_Id
:= First_Formal
(S
);
8310 Formal_2
: constant Entity_Id
:= Next_Formal
(Formal_1
);
8311 Op
: constant Name_Id
:= Chars
(S
);
8312 Result_Type
: constant Entity_Id
:= Base_Type
(Etype
(S
));
8313 Type_1
: constant Entity_Id
:= Base_Type
(Etype
(Formal_1
));
8318 if Present
(Formal_2
) then
8320 Type_2
: constant Entity_Id
:= Base_Type
(Etype
(Formal_2
));
8323 -- All but "&" and "**" have same-types parameters
8332 if Type_1
/= Type_2
then
8337 -- Check parameter and result types
8345 Is_Boolean_Type
(Result_Type
)
8346 and then Result_Type
= Type_1
;
8352 Is_Integer_Type
(Result_Type
)
8353 and then Result_Type
= Type_1
;
8361 Is_Numeric_Type
(Result_Type
)
8362 and then Result_Type
= Type_1
;
8368 Is_Boolean_Type
(Result_Type
)
8369 and then not Is_Limited_Type
(Type_1
);
8377 Is_Boolean_Type
(Result_Type
)
8378 and then (Is_Array_Type
(Type_1
)
8379 or else Is_Scalar_Type
(Type_1
));
8381 when Name_Op_Concat
=>
8382 return Is_Array_Type
(Result_Type
);
8384 when Name_Op_Expon
=>
8386 (Is_Integer_Type
(Result_Type
)
8387 or else Is_Floating_Point_Type
(Result_Type
))
8388 and then Result_Type
= Type_1
8389 and then Type_2
= Standard_Integer
;
8392 raise Program_Error
;
8405 Is_Numeric_Type
(Result_Type
)
8406 and then Result_Type
= Type_1
;
8410 Is_Boolean_Type
(Result_Type
)
8411 and then Result_Type
= Type_1
;
8414 raise Program_Error
;
8417 end Matches_Predefined_Op
;
8421 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
8422 C_E
: Entity_Id
:= Current_Entity
(S
);
8424 -- Start of processing for Enter_Overloaded_Entity
8428 Set_Has_Homonym
(E
);
8429 Set_Has_Homonym
(S
);
8432 Set_Is_Immediately_Visible
(S
);
8433 Set_Scope
(S
, Current_Scope
);
8435 -- Chain new entity if front of homonym in current scope, so that
8436 -- homonyms are contiguous.
8438 if Present
(E
) and then E
/= C_E
then
8439 while Homonym
(C_E
) /= E
loop
8440 C_E
:= Homonym
(C_E
);
8443 Set_Homonym
(C_E
, S
);
8447 Set_Current_Entity
(S
);
8452 if Is_Inherited_Operation
(S
) then
8453 Append_Inherited_Subprogram
(S
);
8455 Append_Entity
(S
, Current_Scope
);
8458 Set_Public_Status
(S
);
8460 if Debug_Flag_E
then
8461 Write_Str
("New overloaded entity chain: ");
8462 Write_Name
(Chars
(S
));
8465 while Present
(E
) loop
8466 Write_Str
(" "); Write_Int
(Int
(E
));
8473 -- Generate warning for hiding
8476 and then Comes_From_Source
(S
)
8477 and then In_Extended_Main_Source_Unit
(S
)
8484 -- Warn unless genuine overloading. Do not emit warning on
8485 -- hiding predefined operators in Standard (these are either an
8486 -- (artifact of our implicit declarations, or simple noise) but
8487 -- keep warning on a operator defined on a local subtype, because
8488 -- of the real danger that different operators may be applied in
8489 -- various parts of the program.
8491 -- Note that if E and S have the same scope, there is never any
8492 -- hiding. Either the two conflict, and the program is illegal,
8493 -- or S is overriding an implicit inherited subprogram.
8495 if Scope
(E
) /= Scope
(S
)
8496 and then (not Is_Overloadable
(E
)
8497 or else Subtype_Conformant
(E
, S
))
8498 and then (Is_Immediately_Visible
(E
)
8499 or else Is_Potentially_Use_Visible
(S
))
8501 if Scope
(E
) = Standard_Standard
then
8502 if Nkind
(S
) = N_Defining_Operator_Symbol
8503 and then Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /=
8505 and then Matches_Predefined_Op
8508 ("declaration of & hides predefined operator?h?", S
);
8511 -- E not immediately within Standard
8514 Error_Msg_Sloc
:= Sloc
(E
);
8515 Error_Msg_N
("declaration of & hides one #?h?", S
);
8520 end Enter_Overloaded_Entity
;
8522 -----------------------------
8523 -- Check_Untagged_Equality --
8524 -----------------------------
8526 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
8527 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
8528 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
8532 -- This check applies only if we have a subprogram declaration with an
8533 -- untagged record type.
8535 if Nkind
(Decl
) /= N_Subprogram_Declaration
8536 or else not Is_Record_Type
(Typ
)
8537 or else Is_Tagged_Type
(Typ
)
8542 -- In Ada 2012 case, we will output errors or warnings depending on
8543 -- the setting of debug flag -gnatd.E.
8545 if Ada_Version
>= Ada_2012
then
8546 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
8548 -- In earlier versions of Ada, nothing to do unless we are warning on
8549 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
8552 if not Warn_On_Ada_2012_Compatibility
then
8557 -- Cases where the type has already been frozen
8559 if Is_Frozen
(Typ
) then
8561 -- If the type is not declared in a package, or if we are in the body
8562 -- of the package or in some other scope, the new operation is not
8563 -- primitive, and therefore legal, though suspicious. Should we
8564 -- generate a warning in this case ???
8566 if Ekind
(Scope
(Typ
)) /= E_Package
8567 or else Scope
(Typ
) /= Current_Scope
8571 -- If the type is a generic actual (sub)type, the operation is not
8572 -- primitive either because the base type is declared elsewhere.
8574 elsif Is_Generic_Actual_Type
(Typ
) then
8577 -- Here we have a definite error of declaration after freezing
8580 if Ada_Version
>= Ada_2012
then
8582 ("equality operator must be declared before type & is "
8583 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
8585 -- In Ada 2012 mode with error turned to warning, output one
8586 -- more warning to warn that the equality operation may not
8587 -- compose. This is the consequence of ignoring the error.
8589 if Error_Msg_Warn
then
8590 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
8595 ("equality operator must be declared before type& is "
8596 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
8599 -- If we are in the package body, we could just move the
8600 -- declaration to the package spec, so add a message saying that.
8602 if In_Package_Body
(Scope
(Typ
)) then
8603 if Ada_Version
>= Ada_2012
then
8605 ("\move declaration to package spec<<", Eq_Op
);
8608 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
8611 -- Otherwise try to find the freezing point
8614 Obj_Decl
:= Next
(Parent
(Typ
));
8615 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
8616 if Nkind
(Obj_Decl
) = N_Object_Declaration
8617 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
8619 -- Freezing point, output warnings
8621 if Ada_Version
>= Ada_2012
then
8623 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
8625 ("\an equality operator cannot be declared after "
8630 ("type& is frozen by declaration (Ada 2012)?y?",
8633 ("\an equality operator cannot be declared after "
8634 & "this point (Ada 2012)?y?",
8646 -- Here if type is not frozen yet. It is illegal to have a primitive
8647 -- equality declared in the private part if the type is visible.
8649 elsif not In_Same_List
(Parent
(Typ
), Decl
)
8650 and then not Is_Limited_Type
(Typ
)
8652 -- Shouldn't we give an RM reference here???
8654 if Ada_Version
>= Ada_2012
then
8656 ("equality operator appears too late<<", Eq_Op
);
8659 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
8662 -- No error detected
8667 end Check_Untagged_Equality
;
8669 -----------------------------
8670 -- Find_Corresponding_Spec --
8671 -----------------------------
8673 function Find_Corresponding_Spec
8675 Post_Error
: Boolean := True) return Entity_Id
8677 Spec
: constant Node_Id
:= Specification
(N
);
8678 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
8682 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
8683 -- Even if fully conformant, a body may depend on a generic actual when
8684 -- the spec does not, or vice versa, in which case they were distinct
8685 -- entities in the generic.
8687 -------------------------------
8688 -- Different_Generic_Profile --
8689 -------------------------------
8691 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
8694 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
8695 -- Check that the types of corresponding formals have the same
8696 -- generic actual if any. We have to account for subtypes of a
8697 -- generic formal, declared between a spec and a body, which may
8698 -- appear distinct in an instance but matched in the generic, and
8699 -- the subtype may be used either in the spec or the body of the
8700 -- subprogram being checked.
8702 -------------------------
8703 -- Same_Generic_Actual --
8704 -------------------------
8706 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
8708 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
8709 -- Predicate to check whether S1 is a subtype of S2 in the source
8712 -------------------------
8713 -- Is_Declared_Subtype --
8714 -------------------------
8716 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
8718 return Comes_From_Source
(Parent
(S1
))
8719 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
8720 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
8721 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
8722 end Is_Declared_Subtype
;
8724 -- Start of processing for Same_Generic_Actual
8727 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
8728 or else Is_Declared_Subtype
(T1
, T2
)
8729 or else Is_Declared_Subtype
(T2
, T1
);
8730 end Same_Generic_Actual
;
8732 -- Start of processing for Different_Generic_Profile
8735 if not In_Instance
then
8738 elsif Ekind
(E
) = E_Function
8739 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
8744 F1
:= First_Formal
(Designator
);
8745 F2
:= First_Formal
(E
);
8746 while Present
(F1
) loop
8747 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
8756 end Different_Generic_Profile
;
8758 -- Start of processing for Find_Corresponding_Spec
8761 E
:= Current_Entity
(Designator
);
8762 while Present
(E
) loop
8764 -- We are looking for a matching spec. It must have the same scope,
8765 -- and the same name, and either be type conformant, or be the case
8766 -- of a library procedure spec and its body (which belong to one
8767 -- another regardless of whether they are type conformant or not).
8769 if Scope
(E
) = Current_Scope
then
8770 if Current_Scope
= Standard_Standard
8771 or else (Ekind
(E
) = Ekind
(Designator
)
8772 and then Type_Conformant
(E
, Designator
))
8774 -- Within an instantiation, we know that spec and body are
8775 -- subtype conformant, because they were subtype conformant in
8776 -- the generic. We choose the subtype-conformant entity here as
8777 -- well, to resolve spurious ambiguities in the instance that
8778 -- were not present in the generic (i.e. when two different
8779 -- types are given the same actual). If we are looking for a
8780 -- spec to match a body, full conformance is expected.
8784 -- Inherit the convention and "ghostness" of the matching
8785 -- spec to ensure proper full and subtype conformance.
8787 Set_Convention
(Designator
, Convention
(E
));
8789 -- Skip past subprogram bodies and subprogram renamings that
8790 -- may appear to have a matching spec, but that aren't fully
8791 -- conformant with it. That can occur in cases where an
8792 -- actual type causes unrelated homographs in the instance.
8794 if Nkind_In
(N
, N_Subprogram_Body
,
8795 N_Subprogram_Renaming_Declaration
)
8796 and then Present
(Homonym
(E
))
8797 and then not Fully_Conformant
(Designator
, E
)
8801 elsif not Subtype_Conformant
(Designator
, E
) then
8804 elsif Different_Generic_Profile
(E
) then
8809 -- Ada 2012 (AI05-0165): For internally generated bodies of
8810 -- null procedures locate the internally generated spec. We
8811 -- enforce mode conformance since a tagged type may inherit
8812 -- from interfaces several null primitives which differ only
8813 -- in the mode of the formals.
8815 if not (Comes_From_Source
(E
))
8816 and then Is_Null_Procedure
(E
)
8817 and then not Mode_Conformant
(Designator
, E
)
8821 -- For null procedures coming from source that are completions,
8822 -- analysis of the generated body will establish the link.
8824 elsif Comes_From_Source
(E
)
8825 and then Nkind
(Spec
) = N_Procedure_Specification
8826 and then Null_Present
(Spec
)
8830 -- Expression functions can be completions, but cannot be
8831 -- completed by an explicit body.
8833 elsif Comes_From_Source
(E
)
8834 and then Comes_From_Source
(N
)
8835 and then Nkind
(N
) = N_Subprogram_Body
8836 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
8837 N_Expression_Function
8839 Error_Msg_Sloc
:= Sloc
(E
);
8840 Error_Msg_N
("body conflicts with expression function#", N
);
8843 elsif not Has_Completion
(E
) then
8844 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
8845 Set_Corresponding_Spec
(N
, E
);
8848 Set_Has_Completion
(E
);
8851 elsif Nkind
(Parent
(N
)) = N_Subunit
then
8853 -- If this is the proper body of a subunit, the completion
8854 -- flag is set when analyzing the stub.
8858 -- If E is an internal function with a controlling result that
8859 -- was created for an operation inherited by a null extension,
8860 -- it may be overridden by a body without a previous spec (one
8861 -- more reason why these should be shunned). In that case we
8862 -- remove the generated body if present, because the current
8863 -- one is the explicit overriding.
8865 elsif Ekind
(E
) = E_Function
8866 and then Ada_Version
>= Ada_2005
8867 and then not Comes_From_Source
(E
)
8868 and then Has_Controlling_Result
(E
)
8869 and then Is_Null_Extension
(Etype
(E
))
8870 and then Comes_From_Source
(Spec
)
8872 Set_Has_Completion
(E
, False);
8875 and then Nkind
(Parent
(E
)) = N_Function_Specification
8878 (Unit_Declaration_Node
8879 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
8883 -- If expansion is disabled, or if the wrapper function has
8884 -- not been generated yet, this a late body overriding an
8885 -- inherited operation, or it is an overriding by some other
8886 -- declaration before the controlling result is frozen. In
8887 -- either case this is a declaration of a new entity.
8893 -- If the body already exists, then this is an error unless
8894 -- the previous declaration is the implicit declaration of a
8895 -- derived subprogram. It is also legal for an instance to
8896 -- contain type conformant overloadable declarations (but the
8897 -- generic declaration may not), per 8.3(26/2).
8899 elsif No
(Alias
(E
))
8900 and then not Is_Intrinsic_Subprogram
(E
)
8901 and then not In_Instance
8904 Error_Msg_Sloc
:= Sloc
(E
);
8906 if Is_Imported
(E
) then
8908 ("body not allowed for imported subprogram & declared#",
8911 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
8915 -- Child units cannot be overloaded, so a conformance mismatch
8916 -- between body and a previous spec is an error.
8918 elsif Is_Child_Unit
(E
)
8920 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
8922 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
8927 ("body of child unit does not match previous declaration", N
);
8935 -- On exit, we know that no previous declaration of subprogram exists
8938 end Find_Corresponding_Spec
;
8940 ----------------------
8941 -- Fully_Conformant --
8942 ----------------------
8944 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8947 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
8949 end Fully_Conformant
;
8951 ----------------------------------
8952 -- Fully_Conformant_Expressions --
8953 ----------------------------------
8955 function Fully_Conformant_Expressions
8956 (Given_E1
: Node_Id
;
8957 Given_E2
: Node_Id
) return Boolean
8959 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
8960 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
8961 -- We always test conformance on original nodes, since it is possible
8962 -- for analysis and/or expansion to make things look as though they
8963 -- conform when they do not, e.g. by converting 1+2 into 3.
8965 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
8966 renames Fully_Conformant_Expressions
;
8968 function FCL
(L1
, L2
: List_Id
) return Boolean;
8969 -- Compare elements of two lists for conformance. Elements have to be
8970 -- conformant, and actuals inserted as default parameters do not match
8971 -- explicit actuals with the same value.
8973 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
8974 -- Compare an operator node with a function call
8980 function FCL
(L1
, L2
: List_Id
) return Boolean is
8984 if L1
= No_List
then
8990 if L2
= No_List
then
8996 -- Compare two lists, skipping rewrite insertions (we want to compare
8997 -- the original trees, not the expanded versions).
9000 if Is_Rewrite_Insertion
(N1
) then
9002 elsif Is_Rewrite_Insertion
(N2
) then
9008 elsif not FCE
(N1
, N2
) then
9021 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
9022 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
9027 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
9032 Act
:= First
(Actuals
);
9034 if Nkind
(Op_Node
) in N_Binary_Op
then
9035 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
9042 return Present
(Act
)
9043 and then FCE
(Right_Opnd
(Op_Node
), Act
)
9044 and then No
(Next
(Act
));
9048 -- Start of processing for Fully_Conformant_Expressions
9051 -- Nonconformant if paren count does not match. Note: if some idiot
9052 -- complains that we don't do this right for more than 3 levels of
9053 -- parentheses, they will be treated with the respect they deserve.
9055 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
9058 -- If same entities are referenced, then they are conformant even if
9059 -- they have different forms (RM 8.3.1(19-20)).
9061 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
9062 if Present
(Entity
(E1
)) then
9063 return Entity
(E1
) = Entity
(E2
)
9065 -- One may be a discriminant that has been replaced by the
9066 -- corresponding discriminal.
9069 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
9070 and then Ekind
(Entity
(E1
)) = E_Discriminant
9071 and then Ekind
(Entity
(E2
)) = E_In_Parameter
)
9073 -- The discriminant of a protected type is transformed into
9074 -- a local constant and then into a parameter of a protected
9078 (Ekind
(Entity
(E1
)) = E_Constant
9079 and then Ekind
(Entity
(E2
)) = E_In_Parameter
9080 and then Present
(Discriminal_Link
(Entity
(E1
)))
9081 and then Discriminal_Link
(Entity
(E1
)) =
9082 Discriminal_Link
(Entity
(E2
)))
9084 -- AI12-050: The loop variables of quantified expressions
9085 -- match if they have the same identifier, even though they
9086 -- are different entities.
9089 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
9090 and then Ekind
(Entity
(E1
)) = E_Loop_Parameter
9091 and then Ekind
(Entity
(E2
)) = E_Loop_Parameter
);
9093 elsif Nkind
(E1
) = N_Expanded_Name
9094 and then Nkind
(E2
) = N_Expanded_Name
9095 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
9096 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
9098 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
9101 -- Identifiers in component associations don't always have
9102 -- entities, but their names must conform.
9104 return Nkind
(E1
) = N_Identifier
9105 and then Nkind
(E2
) = N_Identifier
9106 and then Chars
(E1
) = Chars
(E2
);
9109 elsif Nkind
(E1
) = N_Character_Literal
9110 and then Nkind
(E2
) = N_Expanded_Name
9112 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
9113 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
9115 elsif Nkind
(E2
) = N_Character_Literal
9116 and then Nkind
(E1
) = N_Expanded_Name
9118 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
9119 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
9121 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
9122 return FCO
(E1
, E2
);
9124 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
9125 return FCO
(E2
, E1
);
9127 -- Otherwise we must have the same syntactic entity
9129 elsif Nkind
(E1
) /= Nkind
(E2
) then
9132 -- At this point, we specialize by node type
9138 FCL
(Expressions
(E1
), Expressions
(E2
))
9140 FCL
(Component_Associations
(E1
),
9141 Component_Associations
(E2
));
9144 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
9146 Nkind
(Expression
(E2
)) = N_Qualified_Expression
9148 return FCE
(Expression
(E1
), Expression
(E2
));
9150 -- Check that the subtype marks and any constraints
9155 Indic1
: constant Node_Id
:= Expression
(E1
);
9156 Indic2
: constant Node_Id
:= Expression
(E2
);
9161 if Nkind
(Indic1
) /= N_Subtype_Indication
then
9163 Nkind
(Indic2
) /= N_Subtype_Indication
9164 and then Entity
(Indic1
) = Entity
(Indic2
);
9166 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
9168 Nkind
(Indic1
) /= N_Subtype_Indication
9169 and then Entity
(Indic1
) = Entity
(Indic2
);
9172 if Entity
(Subtype_Mark
(Indic1
)) /=
9173 Entity
(Subtype_Mark
(Indic2
))
9178 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
9179 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
9180 while Present
(Elt1
) and then Present
(Elt2
) loop
9181 if not FCE
(Elt1
, Elt2
) then
9194 when N_Attribute_Reference
=>
9196 Attribute_Name
(E1
) = Attribute_Name
(E2
)
9197 and then FCL
(Expressions
(E1
), Expressions
(E2
));
9201 Entity
(E1
) = Entity
(E2
)
9202 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9203 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9205 when N_Membership_Test
9209 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9211 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9213 when N_Case_Expression
=>
9219 if not FCE
(Expression
(E1
), Expression
(E2
)) then
9223 Alt1
:= First
(Alternatives
(E1
));
9224 Alt2
:= First
(Alternatives
(E2
));
9226 if Present
(Alt1
) /= Present
(Alt2
) then
9228 elsif No
(Alt1
) then
9232 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
9233 or else not FCL
(Discrete_Choices
(Alt1
),
9234 Discrete_Choices
(Alt2
))
9245 when N_Character_Literal
=>
9247 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
9249 when N_Component_Association
=>
9251 FCL
(Choices
(E1
), Choices
(E2
))
9253 FCE
(Expression
(E1
), Expression
(E2
));
9255 when N_Explicit_Dereference
=>
9257 FCE
(Prefix
(E1
), Prefix
(E2
));
9259 when N_Extension_Aggregate
=>
9261 FCL
(Expressions
(E1
), Expressions
(E2
))
9262 and then Null_Record_Present
(E1
) =
9263 Null_Record_Present
(E2
)
9264 and then FCL
(Component_Associations
(E1
),
9265 Component_Associations
(E2
));
9267 when N_Function_Call
=>
9269 FCE
(Name
(E1
), Name
(E2
))
9271 FCL
(Parameter_Associations
(E1
),
9272 Parameter_Associations
(E2
));
9274 when N_If_Expression
=>
9276 FCL
(Expressions
(E1
), Expressions
(E2
));
9278 when N_Indexed_Component
=>
9280 FCE
(Prefix
(E1
), Prefix
(E2
))
9282 FCL
(Expressions
(E1
), Expressions
(E2
));
9284 when N_Integer_Literal
=>
9285 return (Intval
(E1
) = Intval
(E2
));
9290 when N_Operator_Symbol
=>
9292 Chars
(E1
) = Chars
(E2
);
9294 when N_Others_Choice
=>
9297 when N_Parameter_Association
=>
9299 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
9300 and then FCE
(Explicit_Actual_Parameter
(E1
),
9301 Explicit_Actual_Parameter
(E2
));
9303 when N_Qualified_Expression
9305 | N_Unchecked_Type_Conversion
9308 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
9310 FCE
(Expression
(E1
), Expression
(E2
));
9312 when N_Quantified_Expression
=>
9313 if not FCE
(Condition
(E1
), Condition
(E2
)) then
9317 if Present
(Loop_Parameter_Specification
(E1
))
9318 and then Present
(Loop_Parameter_Specification
(E2
))
9321 L1
: constant Node_Id
:=
9322 Loop_Parameter_Specification
(E1
);
9323 L2
: constant Node_Id
:=
9324 Loop_Parameter_Specification
(E2
);
9328 Reverse_Present
(L1
) = Reverse_Present
(L2
)
9330 FCE
(Defining_Identifier
(L1
),
9331 Defining_Identifier
(L2
))
9333 FCE
(Discrete_Subtype_Definition
(L1
),
9334 Discrete_Subtype_Definition
(L2
));
9337 elsif Present
(Iterator_Specification
(E1
))
9338 and then Present
(Iterator_Specification
(E2
))
9341 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
9342 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
9346 FCE
(Defining_Identifier
(I1
),
9347 Defining_Identifier
(I2
))
9349 Of_Present
(I1
) = Of_Present
(I2
)
9351 Reverse_Present
(I1
) = Reverse_Present
(I2
)
9352 and then FCE
(Name
(I1
), Name
(I2
))
9353 and then FCE
(Subtype_Indication
(I1
),
9354 Subtype_Indication
(I2
));
9357 -- The quantified expressions used different specifications to
9358 -- walk their respective ranges.
9366 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
9368 FCE
(High_Bound
(E1
), High_Bound
(E2
));
9370 when N_Real_Literal
=>
9371 return (Realval
(E1
) = Realval
(E2
));
9373 when N_Selected_Component
=>
9375 FCE
(Prefix
(E1
), Prefix
(E2
))
9377 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
9381 FCE
(Prefix
(E1
), Prefix
(E2
))
9383 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
9385 when N_String_Literal
=>
9387 S1
: constant String_Id
:= Strval
(E1
);
9388 S2
: constant String_Id
:= Strval
(E2
);
9389 L1
: constant Nat
:= String_Length
(S1
);
9390 L2
: constant Nat
:= String_Length
(S2
);
9397 for J
in 1 .. L1
loop
9398 if Get_String_Char
(S1
, J
) /=
9399 Get_String_Char
(S2
, J
)
9411 Entity
(E1
) = Entity
(E2
)
9413 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9415 -- All other node types cannot appear in this context. Strictly
9416 -- we should raise a fatal internal error. Instead we just ignore
9417 -- the nodes. This means that if anyone makes a mistake in the
9418 -- expander and mucks an expression tree irretrievably, the result
9419 -- will be a failure to detect a (probably very obscure) case
9420 -- of non-conformance, which is better than bombing on some
9421 -- case where two expressions do in fact conform.
9427 end Fully_Conformant_Expressions
;
9429 ----------------------------------------
9430 -- Fully_Conformant_Discrete_Subtypes --
9431 ----------------------------------------
9433 function Fully_Conformant_Discrete_Subtypes
9434 (Given_S1
: Node_Id
;
9435 Given_S2
: Node_Id
) return Boolean
9437 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
9438 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
9440 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
9441 -- Special-case for a bound given by a discriminant, which in the body
9442 -- is replaced with the discriminal of the enclosing type.
9444 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
9445 -- Check both bounds
9447 -----------------------
9448 -- Conforming_Bounds --
9449 -----------------------
9451 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
9453 if Is_Entity_Name
(B1
)
9454 and then Is_Entity_Name
(B2
)
9455 and then Ekind
(Entity
(B1
)) = E_Discriminant
9457 return Chars
(B1
) = Chars
(B2
);
9460 return Fully_Conformant_Expressions
(B1
, B2
);
9462 end Conforming_Bounds
;
9464 -----------------------
9465 -- Conforming_Ranges --
9466 -----------------------
9468 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
9471 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
9473 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
9474 end Conforming_Ranges
;
9476 -- Start of processing for Fully_Conformant_Discrete_Subtypes
9479 if Nkind
(S1
) /= Nkind
(S2
) then
9482 elsif Is_Entity_Name
(S1
) then
9483 return Entity
(S1
) = Entity
(S2
);
9485 elsif Nkind
(S1
) = N_Range
then
9486 return Conforming_Ranges
(S1
, S2
);
9488 elsif Nkind
(S1
) = N_Subtype_Indication
then
9490 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
9493 (Range_Expression
(Constraint
(S1
)),
9494 Range_Expression
(Constraint
(S2
)));
9498 end Fully_Conformant_Discrete_Subtypes
;
9500 --------------------
9501 -- Install_Entity --
9502 --------------------
9504 procedure Install_Entity
(E
: Entity_Id
) is
9505 Prev
: constant Entity_Id
:= Current_Entity
(E
);
9507 Set_Is_Immediately_Visible
(E
);
9508 Set_Current_Entity
(E
);
9509 Set_Homonym
(E
, Prev
);
9512 ---------------------
9513 -- Install_Formals --
9514 ---------------------
9516 procedure Install_Formals
(Id
: Entity_Id
) is
9519 F
:= First_Formal
(Id
);
9520 while Present
(F
) loop
9524 end Install_Formals
;
9526 -----------------------------
9527 -- Is_Interface_Conformant --
9528 -----------------------------
9530 function Is_Interface_Conformant
9531 (Tagged_Type
: Entity_Id
;
9532 Iface_Prim
: Entity_Id
;
9533 Prim
: Entity_Id
) return Boolean
9535 -- The operation may in fact be an inherited (implicit) operation
9536 -- rather than the original interface primitive, so retrieve the
9537 -- ultimate ancestor.
9539 Iface
: constant Entity_Id
:=
9540 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
9541 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
9543 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
9544 -- Return the controlling formal of Prim
9546 ------------------------
9547 -- Controlling_Formal --
9548 ------------------------
9550 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
9554 E
:= First_Entity
(Prim
);
9555 while Present
(E
) loop
9556 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
9564 end Controlling_Formal
;
9568 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
9569 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
9571 -- Start of processing for Is_Interface_Conformant
9574 pragma Assert
(Is_Subprogram
(Iface_Prim
)
9575 and then Is_Subprogram
(Prim
)
9576 and then Is_Dispatching_Operation
(Iface_Prim
)
9577 and then Is_Dispatching_Operation
(Prim
));
9579 pragma Assert
(Is_Interface
(Iface
)
9580 or else (Present
(Alias
(Iface_Prim
))
9583 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
9585 if Prim
= Iface_Prim
9586 or else not Is_Subprogram
(Prim
)
9587 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
9588 or else not Is_Dispatching_Operation
(Prim
)
9589 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
9591 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
9592 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
9596 -- The mode of the controlling formals must match
9598 elsif Present
(Iface_Ctrl_F
)
9599 and then Present
(Prim_Ctrl_F
)
9600 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
9604 -- Case of a procedure, or a function whose result type matches the
9605 -- result type of the interface primitive, or a function that has no
9606 -- controlling result (I or access I).
9608 elsif Ekind
(Iface_Prim
) = E_Procedure
9609 or else Etype
(Prim
) = Etype
(Iface_Prim
)
9610 or else not Has_Controlling_Result
(Prim
)
9612 return Type_Conformant
9613 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
9615 -- Case of a function returning an interface, or an access to one. Check
9616 -- that the return types correspond.
9618 elsif Implements_Interface
(Typ
, Iface
) then
9619 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
9621 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
9626 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
9627 Skip_Controlling_Formals
=> True);
9633 end Is_Interface_Conformant
;
9635 ---------------------------------
9636 -- Is_Non_Overriding_Operation --
9637 ---------------------------------
9639 function Is_Non_Overriding_Operation
9640 (Prev_E
: Entity_Id
;
9641 New_E
: Entity_Id
) return Boolean
9645 G_Typ
: Entity_Id
:= Empty
;
9647 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
9648 -- If F_Type is a derived type associated with a generic actual subtype,
9649 -- then return its Generic_Parent_Type attribute, else return Empty.
9651 function Types_Correspond
9652 (P_Type
: Entity_Id
;
9653 N_Type
: Entity_Id
) return Boolean;
9654 -- Returns true if and only if the types (or designated types in the
9655 -- case of anonymous access types) are the same or N_Type is derived
9656 -- directly or indirectly from P_Type.
9658 -----------------------------
9659 -- Get_Generic_Parent_Type --
9660 -----------------------------
9662 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
9668 if Is_Derived_Type
(F_Typ
)
9669 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
9671 -- The tree must be traversed to determine the parent subtype in
9672 -- the generic unit, which unfortunately isn't always available
9673 -- via semantic attributes. ??? (Note: The use of Original_Node
9674 -- is needed for cases where a full derived type has been
9677 -- If the parent type is a scalar type, the derivation creates
9678 -- an anonymous base type for it, and the source type is its
9681 if Is_Scalar_Type
(F_Typ
)
9682 and then not Comes_From_Source
(F_Typ
)
9686 (Original_Node
(Parent
(First_Subtype
(F_Typ
))));
9688 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
9690 if Nkind
(Defn
) = N_Derived_Type_Definition
then
9691 Indic
:= Subtype_Indication
(Defn
);
9693 if Nkind
(Indic
) = N_Subtype_Indication
then
9694 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
9696 G_Typ
:= Entity
(Indic
);
9699 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
9700 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
9702 return Generic_Parent_Type
(Parent
(G_Typ
));
9708 end Get_Generic_Parent_Type
;
9710 ----------------------
9711 -- Types_Correspond --
9712 ----------------------
9714 function Types_Correspond
9715 (P_Type
: Entity_Id
;
9716 N_Type
: Entity_Id
) return Boolean
9718 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
9719 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
9722 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
9723 Prev_Type
:= Designated_Type
(Prev_Type
);
9726 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
9727 New_Type
:= Designated_Type
(New_Type
);
9730 if Prev_Type
= New_Type
then
9733 elsif not Is_Class_Wide_Type
(New_Type
) then
9734 while Etype
(New_Type
) /= New_Type
loop
9735 New_Type
:= Etype
(New_Type
);
9737 if New_Type
= Prev_Type
then
9743 end Types_Correspond
;
9745 -- Start of processing for Is_Non_Overriding_Operation
9748 -- In the case where both operations are implicit derived subprograms
9749 -- then neither overrides the other. This can only occur in certain
9750 -- obscure cases (e.g., derivation from homographs created in a generic
9753 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
9756 elsif Ekind
(Current_Scope
) = E_Package
9757 and then Is_Generic_Instance
(Current_Scope
)
9758 and then In_Private_Part
(Current_Scope
)
9759 and then Comes_From_Source
(New_E
)
9761 -- We examine the formals and result type of the inherited operation,
9762 -- to determine whether their type is derived from (the instance of)
9763 -- a generic type. The first such formal or result type is the one
9766 Formal
:= First_Formal
(Prev_E
);
9768 while Present
(Formal
) loop
9769 F_Typ
:= Base_Type
(Etype
(Formal
));
9771 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
9772 F_Typ
:= Designated_Type
(F_Typ
);
9775 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
9776 exit when Present
(G_Typ
);
9778 Next_Formal
(Formal
);
9781 -- If the function dispatches on result check the result type
9783 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
9784 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
9791 -- If the generic type is a private type, then the original operation
9792 -- was not overriding in the generic, because there was no primitive
9793 -- operation to override.
9795 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
9796 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
9797 N_Formal_Private_Type_Definition
9801 -- The generic parent type is the ancestor of a formal derived
9802 -- type declaration. We need to check whether it has a primitive
9803 -- operation that should be overridden by New_E in the generic.
9807 P_Formal
: Entity_Id
;
9808 N_Formal
: Entity_Id
;
9812 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
9815 while Present
(Prim_Elt
) loop
9816 P_Prim
:= Node
(Prim_Elt
);
9818 if Chars
(P_Prim
) = Chars
(New_E
)
9819 and then Ekind
(P_Prim
) = Ekind
(New_E
)
9821 P_Formal
:= First_Formal
(P_Prim
);
9822 N_Formal
:= First_Formal
(New_E
);
9823 while Present
(P_Formal
) and then Present
(N_Formal
) loop
9824 P_Typ
:= Etype
(P_Formal
);
9825 N_Typ
:= Etype
(N_Formal
);
9827 if not Types_Correspond
(P_Typ
, N_Typ
) then
9831 Next_Entity
(P_Formal
);
9832 Next_Entity
(N_Formal
);
9835 -- Found a matching primitive operation belonging to the
9836 -- formal ancestor type, so the new subprogram is
9840 and then No
(N_Formal
)
9841 and then (Ekind
(New_E
) /= E_Function
9844 (Etype
(P_Prim
), Etype
(New_E
)))
9850 Next_Elmt
(Prim_Elt
);
9853 -- If no match found, then the new subprogram does not override
9854 -- in the generic (nor in the instance).
9856 -- If the type in question is not abstract, and the subprogram
9857 -- is, this will be an error if the new operation is in the
9858 -- private part of the instance. Emit a warning now, which will
9859 -- make the subsequent error message easier to understand.
9861 if Present
(F_Typ
) and then not Is_Abstract_Type
(F_Typ
)
9862 and then Is_Abstract_Subprogram
(Prev_E
)
9863 and then In_Private_Part
(Current_Scope
)
9865 Error_Msg_Node_2
:= F_Typ
;
9867 ("private operation& in generic unit does not override "
9868 & "any primitive operation of& (RM 12.3 (18))??",
9878 end Is_Non_Overriding_Operation
;
9880 -------------------------------------
9881 -- List_Inherited_Pre_Post_Aspects --
9882 -------------------------------------
9884 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
9886 if Opt
.List_Inherited_Aspects
9887 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
9890 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
9895 for Index
in Subps
'Range loop
9896 Items
:= Contract
(Subps
(Index
));
9898 if Present
(Items
) then
9899 Prag
:= Pre_Post_Conditions
(Items
);
9900 while Present
(Prag
) loop
9901 Error_Msg_Sloc
:= Sloc
(Prag
);
9903 if Class_Present
(Prag
)
9904 and then not Split_PPC
(Prag
)
9906 if Pragma_Name
(Prag
) = Name_Precondition
then
9908 ("info: & inherits `Pre''Class` aspect from "
9912 ("info: & inherits `Post''Class` aspect from "
9917 Prag
:= Next_Pragma
(Prag
);
9923 end List_Inherited_Pre_Post_Aspects
;
9925 ------------------------------
9926 -- Make_Inequality_Operator --
9927 ------------------------------
9929 -- S is the defining identifier of an equality operator. We build a
9930 -- subprogram declaration with the right signature. This operation is
9931 -- intrinsic, because it is always expanded as the negation of the
9932 -- call to the equality function.
9934 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
9935 Loc
: constant Source_Ptr
:= Sloc
(S
);
9938 Op_Name
: Entity_Id
;
9940 FF
: constant Entity_Id
:= First_Formal
(S
);
9941 NF
: constant Entity_Id
:= Next_Formal
(FF
);
9944 -- Check that equality was properly defined, ignore call if not
9951 A
: constant Entity_Id
:=
9952 Make_Defining_Identifier
(Sloc
(FF
),
9953 Chars
=> Chars
(FF
));
9955 B
: constant Entity_Id
:=
9956 Make_Defining_Identifier
(Sloc
(NF
),
9957 Chars
=> Chars
(NF
));
9960 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
9962 Formals
:= New_List
(
9963 Make_Parameter_Specification
(Loc
,
9964 Defining_Identifier
=> A
,
9966 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
9967 Sloc
(Etype
(First_Formal
(S
))))),
9969 Make_Parameter_Specification
(Loc
,
9970 Defining_Identifier
=> B
,
9972 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
9973 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
9976 Make_Subprogram_Declaration
(Loc
,
9978 Make_Function_Specification
(Loc
,
9979 Defining_Unit_Name
=> Op_Name
,
9980 Parameter_Specifications
=> Formals
,
9981 Result_Definition
=>
9982 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
9984 -- Insert inequality right after equality if it is explicit or after
9985 -- the derived type when implicit. These entities are created only
9986 -- for visibility purposes, and eventually replaced in the course
9987 -- of expansion, so they do not need to be attached to the tree and
9988 -- seen by the back-end. Keeping them internal also avoids spurious
9989 -- freezing problems. The declaration is inserted in the tree for
9990 -- analysis, and removed afterwards. If the equality operator comes
9991 -- from an explicit declaration, attach the inequality immediately
9992 -- after. Else the equality is inherited from a derived type
9993 -- declaration, so insert inequality after that declaration.
9995 if No
(Alias
(S
)) then
9996 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
9997 elsif Is_List_Member
(Parent
(S
)) then
9998 Insert_After
(Parent
(S
), Decl
);
10000 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
10003 Mark_Rewrite_Insertion
(Decl
);
10004 Set_Is_Intrinsic_Subprogram
(Op_Name
);
10007 Set_Has_Completion
(Op_Name
);
10008 Set_Corresponding_Equality
(Op_Name
, S
);
10009 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
10011 end Make_Inequality_Operator
;
10013 ----------------------
10014 -- May_Need_Actuals --
10015 ----------------------
10017 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
10022 F
:= First_Formal
(Fun
);
10024 while Present
(F
) loop
10025 if No
(Default_Value
(F
)) then
10033 Set_Needs_No_Actuals
(Fun
, B
);
10034 end May_Need_Actuals
;
10036 ---------------------
10037 -- Mode_Conformant --
10038 ---------------------
10040 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
10043 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
10045 end Mode_Conformant
;
10047 ---------------------------
10048 -- New_Overloaded_Entity --
10049 ---------------------------
10051 procedure New_Overloaded_Entity
10053 Derived_Type
: Entity_Id
:= Empty
)
10055 Overridden_Subp
: Entity_Id
:= Empty
;
10056 -- Set if the current scope has an operation that is type-conformant
10057 -- with S, and becomes hidden by S.
10059 Is_Primitive_Subp
: Boolean;
10060 -- Set to True if the new subprogram is primitive
10063 -- Entity that S overrides
10065 procedure Check_For_Primitive_Subprogram
10066 (Is_Primitive
: out Boolean;
10067 Is_Overriding
: Boolean := False);
10068 -- If the subprogram being analyzed is a primitive operation of the type
10069 -- of a formal or result, set the Has_Primitive_Operations flag on the
10070 -- type, and set Is_Primitive to True (otherwise set to False). Set the
10071 -- corresponding flag on the entity itself for later use.
10073 function Has_Matching_Entry_Or_Subprogram
(E
: Entity_Id
) return Boolean;
10074 -- True if a) E is a subprogram whose first formal is a concurrent type
10075 -- defined in the scope of E that has some entry or subprogram whose
10076 -- profile matches E, or b) E is an internally built dispatching
10077 -- subprogram of a protected type and there is a matching subprogram
10078 -- defined in the enclosing scope of the protected type, or c) E is
10079 -- an entry of a synchronized type and a matching procedure has been
10080 -- previously defined in the enclosing scope of the synchronized type.
10082 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
10083 -- Check that E is declared in the private part of the current package,
10084 -- or in the package body, where it may hide a previous declaration.
10085 -- We can't use In_Private_Part by itself because this flag is also
10086 -- set when freezing entities, so we must examine the place of the
10087 -- declaration in the tree, and recognize wrapper packages as well.
10089 function Is_Overriding_Alias
10090 (Old_E
: Entity_Id
;
10091 New_E
: Entity_Id
) return Boolean;
10092 -- Check whether new subprogram and old subprogram are both inherited
10093 -- from subprograms that have distinct dispatch table entries. This can
10094 -- occur with derivations from instances with accidental homonyms. The
10095 -- function is conservative given that the converse is only true within
10096 -- instances that contain accidental overloadings.
10098 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
);
10099 -- Report conflict between entities S and E
10101 ------------------------------------
10102 -- Check_For_Primitive_Subprogram --
10103 ------------------------------------
10105 procedure Check_For_Primitive_Subprogram
10106 (Is_Primitive
: out Boolean;
10107 Is_Overriding
: Boolean := False)
10109 Formal
: Entity_Id
;
10113 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
10114 -- Returns true if T is declared in the visible part of the current
10115 -- package scope; otherwise returns false. Assumes that T is declared
10118 procedure Check_Private_Overriding
(T
: Entity_Id
);
10119 -- Checks that if a primitive abstract subprogram of a visible
10120 -- abstract type is declared in a private part, then it must override
10121 -- an abstract subprogram declared in the visible part. Also checks
10122 -- that if a primitive function with a controlling result is declared
10123 -- in a private part, then it must override a function declared in
10124 -- the visible part.
10126 ------------------------------
10127 -- Check_Private_Overriding --
10128 ------------------------------
10130 procedure Check_Private_Overriding
(T
: Entity_Id
) is
10131 function Overrides_Private_Part_Op
return Boolean;
10132 -- This detects the special case where the overriding subprogram
10133 -- is overriding a subprogram that was declared in the same
10134 -- private part. That case is illegal by 3.9.3(10).
10136 function Overrides_Visible_Function
10137 (Partial_View
: Entity_Id
) return Boolean;
10138 -- True if S overrides a function in the visible part. The
10139 -- overridden function could be explicitly or implicitly declared.
10141 -------------------------------
10142 -- Overrides_Private_Part_Op --
10143 -------------------------------
10145 function Overrides_Private_Part_Op
return Boolean is
10146 Over_Decl
: constant Node_Id
:=
10147 Unit_Declaration_Node
(Overridden_Operation
(S
));
10148 Subp_Decl
: constant Node_Id
:= Unit_Declaration_Node
(S
);
10151 pragma Assert
(Is_Overriding
);
10153 (Nkind
(Over_Decl
) = N_Abstract_Subprogram_Declaration
);
10155 (Nkind
(Subp_Decl
) = N_Abstract_Subprogram_Declaration
);
10157 return In_Same_List
(Over_Decl
, Subp_Decl
);
10158 end Overrides_Private_Part_Op
;
10160 --------------------------------
10161 -- Overrides_Visible_Function --
10162 --------------------------------
10164 function Overrides_Visible_Function
10165 (Partial_View
: Entity_Id
) return Boolean
10168 if not Is_Overriding
or else not Has_Homonym
(S
) then
10172 if not Present
(Partial_View
) then
10176 -- Search through all the homonyms H of S in the current
10177 -- package spec, and return True if we find one that matches.
10178 -- Note that Parent (H) will be the declaration of the
10179 -- partial view of T for a match.
10182 H
: Entity_Id
:= S
;
10186 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
10190 N_Private_Extension_Declaration
,
10191 N_Private_Type_Declaration
)
10192 and then Defining_Identifier
(Parent
(H
)) = Partial_View
10200 end Overrides_Visible_Function
;
10202 -- Start of processing for Check_Private_Overriding
10205 if Is_Package_Or_Generic_Package
(Current_Scope
)
10206 and then In_Private_Part
(Current_Scope
)
10207 and then Visible_Part_Type
(T
)
10208 and then not In_Instance
10210 if Is_Abstract_Type
(T
)
10211 and then Is_Abstract_Subprogram
(S
)
10212 and then (not Is_Overriding
10213 or else not Is_Abstract_Subprogram
(E
)
10214 or else Overrides_Private_Part_Op
)
10217 ("abstract subprograms must be visible (RM 3.9.3(10))!",
10220 elsif Ekind
(S
) = E_Function
then
10222 Partial_View
: constant Entity_Id
:=
10223 Incomplete_Or_Partial_View
(T
);
10226 if not Overrides_Visible_Function
(Partial_View
) then
10228 -- Here, S is "function ... return T;" declared in
10229 -- the private part, not overriding some visible
10230 -- operation. That's illegal in the tagged case
10231 -- (but not if the private type is untagged).
10233 if ((Present
(Partial_View
)
10234 and then Is_Tagged_Type
(Partial_View
))
10235 or else (not Present
(Partial_View
)
10236 and then Is_Tagged_Type
(T
)))
10237 and then T
= Base_Type
(Etype
(S
))
10240 ("private function with tagged result must"
10241 & " override visible-part function", S
);
10243 ("\move subprogram to the visible part"
10244 & " (RM 3.9.3(10))", S
);
10246 -- AI05-0073: extend this test to the case of a
10247 -- function with a controlling access result.
10249 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
10250 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
10252 not Is_Class_Wide_Type
10253 (Designated_Type
(Etype
(S
)))
10254 and then Ada_Version
>= Ada_2012
10257 ("private function with controlling access "
10258 & "result must override visible-part function",
10261 ("\move subprogram to the visible part"
10262 & " (RM 3.9.3(10))", S
);
10268 end Check_Private_Overriding
;
10270 -----------------------
10271 -- Visible_Part_Type --
10272 -----------------------
10274 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
10275 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
10278 -- If the entity is a private type, then it must be declared in a
10281 if Ekind
(T
) in Private_Kind
then
10284 elsif Is_Type
(T
) and then Has_Private_Declaration
(T
) then
10287 elsif Is_List_Member
(Declaration_Node
(T
))
10288 and then List_Containing
(Declaration_Node
(T
)) =
10289 Visible_Declarations
(Specification
(P
))
10296 end Visible_Part_Type
;
10298 -- Start of processing for Check_For_Primitive_Subprogram
10301 Is_Primitive
:= False;
10303 if not Comes_From_Source
(S
) then
10306 -- If subprogram is at library level, it is not primitive operation
10308 elsif Current_Scope
= Standard_Standard
then
10311 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
10312 and then not In_Package_Body
(Current_Scope
))
10313 or else Is_Overriding
10315 -- For function, check return type
10317 if Ekind
(S
) = E_Function
then
10318 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
10319 F_Typ
:= Designated_Type
(Etype
(S
));
10321 F_Typ
:= Etype
(S
);
10324 B_Typ
:= Base_Type
(F_Typ
);
10326 if Scope
(B_Typ
) = Current_Scope
10327 and then not Is_Class_Wide_Type
(B_Typ
)
10328 and then not Is_Generic_Type
(B_Typ
)
10330 Is_Primitive
:= True;
10331 Set_Has_Primitive_Operations
(B_Typ
);
10332 Set_Is_Primitive
(S
);
10333 Check_Private_Overriding
(B_Typ
);
10335 -- The Ghost policy in effect at the point of declaration
10336 -- or a tagged type and a primitive operation must match
10337 -- (SPARK RM 6.9(16)).
10339 Check_Ghost_Primitive
(S
, B_Typ
);
10343 -- For all subprograms, check formals
10345 Formal
:= First_Formal
(S
);
10346 while Present
(Formal
) loop
10347 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
10348 F_Typ
:= Designated_Type
(Etype
(Formal
));
10350 F_Typ
:= Etype
(Formal
);
10353 B_Typ
:= Base_Type
(F_Typ
);
10355 if Ekind
(B_Typ
) = E_Access_Subtype
then
10356 B_Typ
:= Base_Type
(B_Typ
);
10359 if Scope
(B_Typ
) = Current_Scope
10360 and then not Is_Class_Wide_Type
(B_Typ
)
10361 and then not Is_Generic_Type
(B_Typ
)
10363 Is_Primitive
:= True;
10364 Set_Is_Primitive
(S
);
10365 Set_Has_Primitive_Operations
(B_Typ
);
10366 Check_Private_Overriding
(B_Typ
);
10368 -- The Ghost policy in effect at the point of declaration
10369 -- of a tagged type and a primitive operation must match
10370 -- (SPARK RM 6.9(16)).
10372 Check_Ghost_Primitive
(S
, B_Typ
);
10375 Next_Formal
(Formal
);
10378 -- Special case: An equality function can be redefined for a type
10379 -- occurring in a declarative part, and won't otherwise be treated as
10380 -- a primitive because it doesn't occur in a package spec and doesn't
10381 -- override an inherited subprogram. It's important that we mark it
10382 -- primitive so it can be returned by Collect_Primitive_Operations
10383 -- and be used in composing the equality operation of later types
10384 -- that have a component of the type.
10386 elsif Chars
(S
) = Name_Op_Eq
10387 and then Etype
(S
) = Standard_Boolean
10389 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
10391 if Scope
(B_Typ
) = Current_Scope
10393 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
10394 and then not Is_Limited_Type
(B_Typ
)
10396 Is_Primitive
:= True;
10397 Set_Is_Primitive
(S
);
10398 Set_Has_Primitive_Operations
(B_Typ
);
10399 Check_Private_Overriding
(B_Typ
);
10401 -- The Ghost policy in effect at the point of declaration of a
10402 -- tagged type and a primitive operation must match
10403 -- (SPARK RM 6.9(16)).
10405 Check_Ghost_Primitive
(S
, B_Typ
);
10408 end Check_For_Primitive_Subprogram
;
10410 --------------------------------------
10411 -- Has_Matching_Entry_Or_Subprogram --
10412 --------------------------------------
10414 function Has_Matching_Entry_Or_Subprogram
10415 (E
: Entity_Id
) return Boolean
10417 function Check_Conforming_Parameters
10418 (E1_Param
: Node_Id
;
10419 E2_Param
: Node_Id
) return Boolean;
10420 -- Starting from the given parameters, check that all the parameters
10421 -- of two entries or subprograms are subtype conformant. Used to skip
10422 -- the check on the controlling argument.
10424 function Matching_Entry_Or_Subprogram
10425 (Conc_Typ
: Entity_Id
;
10426 Subp
: Entity_Id
) return Entity_Id
;
10427 -- Return the first entry or subprogram of the given concurrent type
10428 -- whose name matches the name of Subp and has a profile conformant
10429 -- with Subp; return Empty if not found.
10431 function Matching_Dispatching_Subprogram
10432 (Conc_Typ
: Entity_Id
;
10433 Ent
: Entity_Id
) return Entity_Id
;
10434 -- Return the first dispatching primitive of Conc_Type defined in the
10435 -- enclosing scope of Conc_Type (i.e. before the full definition of
10436 -- this concurrent type) whose name matches the entry Ent and has a
10437 -- profile conformant with the profile of the corresponding (not yet
10438 -- built) dispatching primitive of Ent; return Empty if not found.
10440 function Matching_Original_Protected_Subprogram
10441 (Prot_Typ
: Entity_Id
;
10442 Subp
: Entity_Id
) return Entity_Id
;
10443 -- Return the first subprogram defined in the enclosing scope of
10444 -- Prot_Typ (before the full definition of this protected type)
10445 -- whose name matches the original name of Subp and has a profile
10446 -- conformant with the profile of Subp; return Empty if not found.
10448 ---------------------------------
10449 -- Check_Conforming_Parameters --
10450 ---------------------------------
10452 function Check_Conforming_Parameters
10453 (E1_Param
: Node_Id
;
10454 E2_Param
: Node_Id
) return Boolean
10456 Param_E1
: Node_Id
:= E1_Param
;
10457 Param_E2
: Node_Id
:= E2_Param
;
10460 while Present
(Param_E1
) and then Present
(Param_E2
) loop
10461 if Ekind
(Defining_Identifier
(Param_E1
)) /=
10462 Ekind
(Defining_Identifier
(Param_E2
))
10465 (Find_Parameter_Type
(Param_E1
),
10466 Find_Parameter_Type
(Param_E2
),
10467 Subtype_Conformant
)
10476 -- The candidate is not valid if one of the two lists contains
10477 -- more parameters than the other
10479 return No
(Param_E1
) and then No
(Param_E2
);
10480 end Check_Conforming_Parameters
;
10482 ----------------------------------
10483 -- Matching_Entry_Or_Subprogram --
10484 ----------------------------------
10486 function Matching_Entry_Or_Subprogram
10487 (Conc_Typ
: Entity_Id
;
10488 Subp
: Entity_Id
) return Entity_Id
10493 E
:= First_Entity
(Conc_Typ
);
10494 while Present
(E
) loop
10495 if Chars
(Subp
) = Chars
(E
)
10496 and then (Ekind
(E
) = E_Entry
or else Is_Subprogram
(E
))
10498 Check_Conforming_Parameters
10499 (First
(Parameter_Specifications
(Parent
(E
))),
10500 Next
(First
(Parameter_Specifications
(Parent
(Subp
)))))
10509 end Matching_Entry_Or_Subprogram
;
10511 -------------------------------------
10512 -- Matching_Dispatching_Subprogram --
10513 -------------------------------------
10515 function Matching_Dispatching_Subprogram
10516 (Conc_Typ
: Entity_Id
;
10517 Ent
: Entity_Id
) return Entity_Id
10522 -- Search for entities in the enclosing scope of this synchonized
10525 pragma Assert
(Is_Concurrent_Type
(Conc_Typ
));
10526 Push_Scope
(Scope
(Conc_Typ
));
10527 E
:= Current_Entity_In_Scope
(Ent
);
10530 while Present
(E
) loop
10531 if Scope
(E
) = Scope
(Conc_Typ
)
10532 and then Comes_From_Source
(E
)
10533 and then Ekind
(E
) = E_Procedure
10534 and then Present
(First_Entity
(E
))
10535 and then Is_Controlling_Formal
(First_Entity
(E
))
10536 and then Etype
(First_Entity
(E
)) = Conc_Typ
10538 Check_Conforming_Parameters
10539 (First
(Parameter_Specifications
(Parent
(Ent
))),
10540 Next
(First
(Parameter_Specifications
(Parent
(E
)))))
10549 end Matching_Dispatching_Subprogram
;
10551 --------------------------------------------
10552 -- Matching_Original_Protected_Subprogram --
10553 --------------------------------------------
10555 function Matching_Original_Protected_Subprogram
10556 (Prot_Typ
: Entity_Id
;
10557 Subp
: Entity_Id
) return Entity_Id
10559 ICF
: constant Boolean :=
10560 Is_Controlling_Formal
(First_Entity
(Subp
));
10564 -- Temporarily decorate the first parameter of Subp as controlling
10565 -- formal, required to invoke Subtype_Conformant.
10567 Set_Is_Controlling_Formal
(First_Entity
(Subp
));
10570 Current_Entity_In_Scope
(Original_Protected_Subprogram
(Subp
));
10572 while Present
(E
) loop
10573 if Scope
(E
) = Scope
(Prot_Typ
)
10574 and then Comes_From_Source
(E
)
10575 and then Ekind
(Subp
) = Ekind
(E
)
10576 and then Present
(First_Entity
(E
))
10577 and then Is_Controlling_Formal
(First_Entity
(E
))
10578 and then Etype
(First_Entity
(E
)) = Prot_Typ
10579 and then Subtype_Conformant
(Subp
, E
,
10580 Skip_Controlling_Formals
=> True)
10582 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10589 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10592 end Matching_Original_Protected_Subprogram
;
10594 -- Start of processing for Has_Matching_Entry_Or_Subprogram
10597 -- Case 1: E is a subprogram whose first formal is a concurrent type
10598 -- defined in the scope of E that has an entry or subprogram whose
10599 -- profile matches E.
10601 if Comes_From_Source
(E
)
10602 and then Is_Subprogram
(E
)
10603 and then Present
(First_Entity
(E
))
10604 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10607 Scope
(Corresponding_Concurrent_Type
10608 (Etype
(First_Entity
(E
))))
10611 (Matching_Entry_Or_Subprogram
10612 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10615 Report_Conflict
(E
,
10616 Matching_Entry_Or_Subprogram
10617 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10622 -- Case 2: E is an internally built dispatching subprogram of a
10623 -- protected type and there is a subprogram defined in the enclosing
10624 -- scope of the protected type that has the original name of E and
10625 -- its profile is conformant with the profile of E. We check the
10626 -- name of the original protected subprogram associated with E since
10627 -- the expander builds dispatching primitives of protected functions
10628 -- and procedures with other names (see Exp_Ch9.Build_Selected_Name).
10630 elsif not Comes_From_Source
(E
)
10631 and then Is_Subprogram
(E
)
10632 and then Present
(First_Entity
(E
))
10633 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10634 and then Present
(Original_Protected_Subprogram
(E
))
10637 (Matching_Original_Protected_Subprogram
10638 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10641 Report_Conflict
(E
,
10642 Matching_Original_Protected_Subprogram
10643 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10647 -- Case 3: E is an entry of a synchronized type and a matching
10648 -- procedure has been previously defined in the enclosing scope
10649 -- of the synchronized type.
10651 elsif Comes_From_Source
(E
)
10652 and then Ekind
(E
) = E_Entry
10654 Present
(Matching_Dispatching_Subprogram
(Current_Scope
, E
))
10656 Report_Conflict
(E
,
10657 Matching_Dispatching_Subprogram
(Current_Scope
, E
));
10662 end Has_Matching_Entry_Or_Subprogram
;
10664 ----------------------------
10665 -- Is_Private_Declaration --
10666 ----------------------------
10668 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
10669 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
10670 Priv_Decls
: List_Id
;
10673 if Is_Package_Or_Generic_Package
(Current_Scope
)
10674 and then In_Private_Part
(Current_Scope
)
10677 Private_Declarations
(Package_Specification
(Current_Scope
));
10679 return In_Package_Body
(Current_Scope
)
10681 (Is_List_Member
(Decl
)
10682 and then List_Containing
(Decl
) = Priv_Decls
)
10683 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
10685 Is_Compilation_Unit
10686 (Defining_Entity
(Parent
(Decl
)))
10687 and then List_Containing
(Parent
(Parent
(Decl
))) =
10692 end Is_Private_Declaration
;
10694 --------------------------
10695 -- Is_Overriding_Alias --
10696 --------------------------
10698 function Is_Overriding_Alias
10699 (Old_E
: Entity_Id
;
10700 New_E
: Entity_Id
) return Boolean
10702 AO
: constant Entity_Id
:= Alias
(Old_E
);
10703 AN
: constant Entity_Id
:= Alias
(New_E
);
10706 return Scope
(AO
) /= Scope
(AN
)
10707 or else No
(DTC_Entity
(AO
))
10708 or else No
(DTC_Entity
(AN
))
10709 or else DT_Position
(AO
) = DT_Position
(AN
);
10710 end Is_Overriding_Alias
;
10712 ---------------------
10713 -- Report_Conflict --
10714 ---------------------
10716 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
) is
10718 Error_Msg_Sloc
:= Sloc
(E
);
10720 -- Generate message, with useful additional warning if in generic
10722 if Is_Generic_Unit
(E
) then
10723 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
10724 Error_Msg_N
("\& conflicts with declaration#", S
);
10726 Error_Msg_N
("& conflicts with declaration#", S
);
10728 end Report_Conflict
;
10730 -- Start of processing for New_Overloaded_Entity
10733 -- We need to look for an entity that S may override. This must be a
10734 -- homonym in the current scope, so we look for the first homonym of
10735 -- S in the current scope as the starting point for the search.
10737 E
:= Current_Entity_In_Scope
(S
);
10739 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
10740 -- They are directly added to the list of primitive operations of
10741 -- Derived_Type, unless this is a rederivation in the private part
10742 -- of an operation that was already derived in the visible part of
10743 -- the current package.
10745 if Ada_Version
>= Ada_2005
10746 and then Present
(Derived_Type
)
10747 and then Present
(Alias
(S
))
10748 and then Is_Dispatching_Operation
(Alias
(S
))
10749 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
10750 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
10752 -- For private types, when the full-view is processed we propagate to
10753 -- the full view the non-overridden entities whose attribute "alias"
10754 -- references an interface primitive. These entities were added by
10755 -- Derive_Subprograms to ensure that interface primitives are
10758 -- Inside_Freeze_Actions is non zero when S corresponds with an
10759 -- internal entity that links an interface primitive with its
10760 -- covering primitive through attribute Interface_Alias (see
10761 -- Add_Internal_Interface_Entities).
10763 if Inside_Freezing_Actions
= 0
10764 and then Is_Package_Or_Generic_Package
(Current_Scope
)
10765 and then In_Private_Part
(Current_Scope
)
10766 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
10767 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
10768 and then Full_View
(Defining_Identifier
(Parent
(E
)))
10769 = Defining_Identifier
(Parent
(S
))
10770 and then Alias
(E
) = Alias
(S
)
10772 Check_Operation_From_Private_View
(S
, E
);
10773 Set_Is_Dispatching_Operation
(S
);
10778 Enter_Overloaded_Entity
(S
);
10779 Check_Dispatching_Operation
(S
, Empty
);
10780 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10786 -- For synchronized types check conflicts of this entity with previously
10787 -- defined entities.
10789 if Ada_Version
>= Ada_2005
10790 and then Has_Matching_Entry_Or_Subprogram
(S
)
10795 -- If there is no homonym then this is definitely not overriding
10798 Enter_Overloaded_Entity
(S
);
10799 Check_Dispatching_Operation
(S
, Empty
);
10800 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10802 -- If subprogram has an explicit declaration, check whether it has an
10803 -- overriding indicator.
10805 if Comes_From_Source
(S
) then
10806 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10808 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
10809 -- it may have overridden some hidden inherited primitive. Update
10810 -- Overridden_Subp to avoid spurious errors when checking the
10811 -- overriding indicator.
10813 if Ada_Version
>= Ada_2012
10814 and then No
(Overridden_Subp
)
10815 and then Is_Dispatching_Operation
(S
)
10816 and then Present
(Overridden_Operation
(S
))
10818 Overridden_Subp
:= Overridden_Operation
(S
);
10821 Check_Overriding_Indicator
10822 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
10824 -- The Ghost policy in effect at the point of declaration of a
10825 -- parent subprogram and an overriding subprogram must match
10826 -- (SPARK RM 6.9(17)).
10828 Check_Ghost_Overriding
(S
, Overridden_Subp
);
10831 -- If there is a homonym that is not overloadable, then we have an
10832 -- error, except for the special cases checked explicitly below.
10834 elsif not Is_Overloadable
(E
) then
10836 -- Check for spurious conflict produced by a subprogram that has the
10837 -- same name as that of the enclosing generic package. The conflict
10838 -- occurs within an instance, between the subprogram and the renaming
10839 -- declaration for the package. After the subprogram, the package
10840 -- renaming declaration becomes hidden.
10842 if Ekind
(E
) = E_Package
10843 and then Present
(Renamed_Object
(E
))
10844 and then Renamed_Object
(E
) = Current_Scope
10845 and then Nkind
(Parent
(Renamed_Object
(E
))) =
10846 N_Package_Specification
10847 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
10850 Set_Is_Immediately_Visible
(E
, False);
10851 Enter_Overloaded_Entity
(S
);
10852 Set_Homonym
(S
, Homonym
(E
));
10853 Check_Dispatching_Operation
(S
, Empty
);
10854 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
10856 -- If the subprogram is implicit it is hidden by the previous
10857 -- declaration. However if it is dispatching, it must appear in the
10858 -- dispatch table anyway, because it can be dispatched to even if it
10859 -- cannot be called directly.
10861 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
10862 Set_Scope
(S
, Current_Scope
);
10864 if Is_Dispatching_Operation
(Alias
(S
)) then
10865 Check_Dispatching_Operation
(S
, Empty
);
10871 Report_Conflict
(S
, E
);
10875 -- E exists and is overloadable
10878 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10880 -- Loop through E and its homonyms to determine if any of them is
10881 -- the candidate for overriding by S.
10883 while Present
(E
) loop
10885 -- Definitely not interesting if not in the current scope
10887 if Scope
(E
) /= Current_Scope
then
10890 -- A function can overload the name of an abstract state. The
10891 -- state can be viewed as a function with a profile that cannot
10892 -- be matched by anything.
10894 elsif Ekind
(S
) = E_Function
10895 and then Ekind
(E
) = E_Abstract_State
10897 Enter_Overloaded_Entity
(S
);
10900 -- Ada 2012 (AI05-0165): For internally generated bodies of null
10901 -- procedures locate the internally generated spec. We enforce
10902 -- mode conformance since a tagged type may inherit from
10903 -- interfaces several null primitives which differ only in
10904 -- the mode of the formals.
10906 elsif not Comes_From_Source
(S
)
10907 and then Is_Null_Procedure
(S
)
10908 and then not Mode_Conformant
(E
, S
)
10912 -- Check if we have type conformance
10914 elsif Type_Conformant
(E
, S
) then
10916 -- If the old and new entities have the same profile and one
10917 -- is not the body of the other, then this is an error, unless
10918 -- one of them is implicitly declared.
10920 -- There are some cases when both can be implicit, for example
10921 -- when both a literal and a function that overrides it are
10922 -- inherited in a derivation, or when an inherited operation
10923 -- of a tagged full type overrides the inherited operation of
10924 -- a private extension. Ada 83 had a special rule for the
10925 -- literal case. In Ada 95, the later implicit operation hides
10926 -- the former, and the literal is always the former. In the
10927 -- odd case where both are derived operations declared at the
10928 -- same point, both operations should be declared, and in that
10929 -- case we bypass the following test and proceed to the next
10930 -- part. This can only occur for certain obscure cases in
10931 -- instances, when an operation on a type derived from a formal
10932 -- private type does not override a homograph inherited from
10933 -- the actual. In subsequent derivations of such a type, the
10934 -- DT positions of these operations remain distinct, if they
10937 if Present
(Alias
(S
))
10938 and then (No
(Alias
(E
))
10939 or else Comes_From_Source
(E
)
10940 or else Is_Abstract_Subprogram
(S
)
10942 (Is_Dispatching_Operation
(E
)
10943 and then Is_Overriding_Alias
(E
, S
)))
10944 and then Ekind
(E
) /= E_Enumeration_Literal
10946 -- When an derived operation is overloaded it may be due to
10947 -- the fact that the full view of a private extension
10948 -- re-inherits. It has to be dealt with.
10950 if Is_Package_Or_Generic_Package
(Current_Scope
)
10951 and then In_Private_Part
(Current_Scope
)
10953 Check_Operation_From_Private_View
(S
, E
);
10956 -- In any case the implicit operation remains hidden by the
10957 -- existing declaration, which is overriding. Indicate that
10958 -- E overrides the operation from which S is inherited.
10960 if Present
(Alias
(S
)) then
10961 Set_Overridden_Operation
(E
, Alias
(S
));
10962 Inherit_Subprogram_Contract
(E
, Alias
(S
));
10965 Set_Overridden_Operation
(E
, S
);
10966 Inherit_Subprogram_Contract
(E
, S
);
10969 if Comes_From_Source
(E
) then
10970 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
10972 -- The Ghost policy in effect at the point of declaration
10973 -- of a parent subprogram and an overriding subprogram
10974 -- must match (SPARK RM 6.9(17)).
10976 Check_Ghost_Overriding
(E
, S
);
10981 -- Within an instance, the renaming declarations for actual
10982 -- subprograms may become ambiguous, but they do not hide each
10985 elsif Ekind
(E
) /= E_Entry
10986 and then not Comes_From_Source
(E
)
10987 and then not Is_Generic_Instance
(E
)
10988 and then (Present
(Alias
(E
))
10989 or else Is_Intrinsic_Subprogram
(E
))
10990 and then (not In_Instance
10991 or else No
(Parent
(E
))
10992 or else Nkind
(Unit_Declaration_Node
(E
)) /=
10993 N_Subprogram_Renaming_Declaration
)
10995 -- A subprogram child unit is not allowed to override an
10996 -- inherited subprogram (10.1.1(20)).
10998 if Is_Child_Unit
(S
) then
11000 ("child unit overrides inherited subprogram in parent",
11005 if Is_Non_Overriding_Operation
(E
, S
) then
11006 Enter_Overloaded_Entity
(S
);
11008 if No
(Derived_Type
)
11009 or else Is_Tagged_Type
(Derived_Type
)
11011 Check_Dispatching_Operation
(S
, Empty
);
11017 -- E is a derived operation or an internal operator which
11018 -- is being overridden. Remove E from further visibility.
11019 -- Furthermore, if E is a dispatching operation, it must be
11020 -- replaced in the list of primitive operations of its type
11021 -- (see Override_Dispatching_Operation).
11023 Overridden_Subp
:= E
;
11025 -- It is possible for E to be in the current scope and
11026 -- yet not in the entity chain. This can only occur in a
11027 -- generic context where E is an implicit concatenation
11028 -- in the formal part, because in a generic body the
11029 -- entity chain starts with the formals.
11031 -- In GNATprove mode, a wrapper for an operation with
11032 -- axiomatization may be a homonym of another declaration
11033 -- for an actual subprogram (needs refinement ???).
11035 if No
(Prev_Entity
(E
)) then
11037 and then GNATprove_Mode
11039 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
11040 N_Subprogram_Renaming_Declaration
11044 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
11049 -- E must be removed both from the entity_list of the
11050 -- current scope, and from the visibility chain.
11052 if Debug_Flag_E
then
11053 Write_Str
("Override implicit operation ");
11054 Write_Int
(Int
(E
));
11058 -- If E is a predefined concatenation, it stands for four
11059 -- different operations. As a result, a single explicit
11060 -- declaration does not hide it. In a possible ambiguous
11061 -- situation, Disambiguate chooses the user-defined op,
11062 -- so it is correct to retain the previous internal one.
11064 if Chars
(E
) /= Name_Op_Concat
11065 or else Ekind
(E
) /= E_Operator
11067 -- For nondispatching derived operations that are
11068 -- overridden by a subprogram declared in the private
11069 -- part of a package, we retain the derived subprogram
11070 -- but mark it as not immediately visible. If the
11071 -- derived operation was declared in the visible part
11072 -- then this ensures that it will still be visible
11073 -- outside the package with the proper signature
11074 -- (calls from outside must also be directed to this
11075 -- version rather than the overriding one, unlike the
11076 -- dispatching case). Calls from inside the package
11077 -- will still resolve to the overriding subprogram
11078 -- since the derived one is marked as not visible
11079 -- within the package.
11081 -- If the private operation is dispatching, we achieve
11082 -- the overriding by keeping the implicit operation
11083 -- but setting its alias to be the overriding one. In
11084 -- this fashion the proper body is executed in all
11085 -- cases, but the original signature is used outside
11088 -- If the overriding is not in the private part, we
11089 -- remove the implicit operation altogether.
11091 if Is_Private_Declaration
(S
) then
11092 if not Is_Dispatching_Operation
(E
) then
11093 Set_Is_Immediately_Visible
(E
, False);
11095 -- Work done in Override_Dispatching_Operation, so
11096 -- nothing else needs to be done here.
11102 Remove_Entity_And_Homonym
(E
);
11106 Enter_Overloaded_Entity
(S
);
11108 -- For entities generated by Derive_Subprograms the
11109 -- overridden operation is the inherited primitive
11110 -- (which is available through the attribute alias).
11112 if not (Comes_From_Source
(E
))
11113 and then Is_Dispatching_Operation
(E
)
11114 and then Find_Dispatching_Type
(E
) =
11115 Find_Dispatching_Type
(S
)
11116 and then Present
(Alias
(E
))
11117 and then Comes_From_Source
(Alias
(E
))
11119 Set_Overridden_Operation
(S
, Alias
(E
));
11120 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11122 -- Normal case of setting entity as overridden
11124 -- Note: Static_Initialization and Overridden_Operation
11125 -- attributes use the same field in subprogram entities.
11126 -- Static_Initialization is only defined for internal
11127 -- initialization procedures, where Overridden_Operation
11128 -- is irrelevant. Therefore the setting of this attribute
11129 -- must check whether the target is an init_proc.
11131 elsif not Is_Init_Proc
(S
) then
11132 Set_Overridden_Operation
(S
, E
);
11133 Inherit_Subprogram_Contract
(S
, E
);
11136 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
11138 -- The Ghost policy in effect at the point of declaration
11139 -- of a parent subprogram and an overriding subprogram
11140 -- must match (SPARK RM 6.9(17)).
11142 Check_Ghost_Overriding
(S
, E
);
11144 -- If S is a user-defined subprogram or a null procedure
11145 -- expanded to override an inherited null procedure, or a
11146 -- predefined dispatching primitive then indicate that E
11147 -- overrides the operation from which S is inherited.
11149 if Comes_From_Source
(S
)
11151 (Present
(Parent
(S
))
11152 and then Nkind
(Parent
(S
)) = N_Procedure_Specification
11153 and then Null_Present
(Parent
(S
)))
11155 (Present
(Alias
(E
))
11157 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
11159 if Present
(Alias
(E
)) then
11160 Set_Overridden_Operation
(S
, Alias
(E
));
11161 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11165 if Is_Dispatching_Operation
(E
) then
11167 -- An overriding dispatching subprogram inherits the
11168 -- convention of the overridden subprogram (AI-117).
11170 Set_Convention
(S
, Convention
(E
));
11171 Check_Dispatching_Operation
(S
, E
);
11174 Check_Dispatching_Operation
(S
, Empty
);
11177 Check_For_Primitive_Subprogram
11178 (Is_Primitive_Subp
, Is_Overriding
=> True);
11179 goto Check_Inequality
;
11181 -- Apparent redeclarations in instances can occur when two
11182 -- formal types get the same actual type. The subprograms in
11183 -- in the instance are legal, even if not callable from the
11184 -- outside. Calls from within are disambiguated elsewhere.
11185 -- For dispatching operations in the visible part, the usual
11186 -- rules apply, and operations with the same profile are not
11187 -- legal (B830001).
11189 elsif (In_Instance_Visible_Part
11190 and then not Is_Dispatching_Operation
(E
))
11191 or else In_Instance_Not_Visible
11195 -- Here we have a real error (identical profile)
11198 Error_Msg_Sloc
:= Sloc
(E
);
11200 -- Avoid cascaded errors if the entity appears in
11201 -- subsequent calls.
11203 Set_Scope
(S
, Current_Scope
);
11205 -- Generate error, with extra useful warning for the case
11206 -- of a generic instance with no completion.
11208 if Is_Generic_Instance
(S
)
11209 and then not Has_Completion
(E
)
11212 ("instantiation cannot provide body for&", S
);
11213 Error_Msg_N
("\& conflicts with declaration#", S
);
11215 Error_Msg_N
("& conflicts with declaration#", S
);
11222 -- If one subprogram has an access parameter and the other
11223 -- a parameter of an access type, calls to either might be
11224 -- ambiguous. Verify that parameters match except for the
11225 -- access parameter.
11227 if May_Hide_Profile
then
11233 F1
:= First_Formal
(S
);
11234 F2
:= First_Formal
(E
);
11235 while Present
(F1
) and then Present
(F2
) loop
11236 if Is_Access_Type
(Etype
(F1
)) then
11237 if not Is_Access_Type
(Etype
(F2
))
11238 or else not Conforming_Types
11239 (Designated_Type
(Etype
(F1
)),
11240 Designated_Type
(Etype
(F2
)),
11243 May_Hide_Profile
:= False;
11247 not Conforming_Types
11248 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
11250 May_Hide_Profile
:= False;
11257 if May_Hide_Profile
11261 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
11270 -- On exit, we know that S is a new entity
11272 Enter_Overloaded_Entity
(S
);
11273 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
11274 Check_Overriding_Indicator
11275 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
11277 -- The Ghost policy in effect at the point of declaration of a parent
11278 -- subprogram and an overriding subprogram must match
11279 -- (SPARK RM 6.9(17)).
11281 Check_Ghost_Overriding
(S
, Overridden_Subp
);
11283 -- Overloading is not allowed in SPARK, except for operators
11285 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
11286 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
11287 Check_SPARK_05_Restriction
11288 ("overloading not allowed with entity#", S
);
11291 -- If S is a derived operation for an untagged type then by
11292 -- definition it's not a dispatching operation (even if the parent
11293 -- operation was dispatching), so Check_Dispatching_Operation is not
11294 -- called in that case.
11296 if No
(Derived_Type
)
11297 or else Is_Tagged_Type
(Derived_Type
)
11299 Check_Dispatching_Operation
(S
, Empty
);
11303 -- If this is a user-defined equality operator that is not a derived
11304 -- subprogram, create the corresponding inequality. If the operation is
11305 -- dispatching, the expansion is done elsewhere, and we do not create
11306 -- an explicit inequality operation.
11308 <<Check_Inequality
>>
11309 if Chars
(S
) = Name_Op_Eq
11310 and then Etype
(S
) = Standard_Boolean
11311 and then Present
(Parent
(S
))
11312 and then not Is_Dispatching_Operation
(S
)
11314 Make_Inequality_Operator
(S
);
11315 Check_Untagged_Equality
(S
);
11317 end New_Overloaded_Entity
;
11319 ---------------------
11320 -- Process_Formals --
11321 ---------------------
11323 procedure Process_Formals
11325 Related_Nod
: Node_Id
)
11327 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
11328 -- Determine whether an access type designates a type coming from a
11331 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
11332 -- Check whether the default has a class-wide type. After analysis the
11333 -- default has the type of the formal, so we must also check explicitly
11334 -- for an access attribute.
11336 ----------------------------------
11337 -- Designates_From_Limited_With --
11338 ----------------------------------
11340 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
11341 Desig
: Entity_Id
:= Typ
;
11344 if Is_Access_Type
(Desig
) then
11345 Desig
:= Directly_Designated_Type
(Desig
);
11348 if Is_Class_Wide_Type
(Desig
) then
11349 Desig
:= Root_Type
(Desig
);
11353 Ekind
(Desig
) = E_Incomplete_Type
11354 and then From_Limited_With
(Desig
);
11355 end Designates_From_Limited_With
;
11357 ---------------------------
11358 -- Is_Class_Wide_Default --
11359 ---------------------------
11361 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
11363 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
11364 or else (Nkind
(D
) = N_Attribute_Reference
11365 and then Attribute_Name
(D
) = Name_Access
11366 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
11367 end Is_Class_Wide_Default
;
11371 Context
: constant Node_Id
:= Parent
(Parent
(T
));
11373 Formal
: Entity_Id
;
11374 Formal_Type
: Entity_Id
;
11375 Param_Spec
: Node_Id
;
11378 Num_Out_Params
: Nat
:= 0;
11379 First_Out_Param
: Entity_Id
:= Empty
;
11380 -- Used for setting Is_Only_Out_Parameter
11382 -- Start of processing for Process_Formals
11385 -- In order to prevent premature use of the formals in the same formal
11386 -- part, the Ekind is left undefined until all default expressions are
11387 -- analyzed. The Ekind is established in a separate loop at the end.
11389 Param_Spec
:= First
(T
);
11390 while Present
(Param_Spec
) loop
11391 Formal
:= Defining_Identifier
(Param_Spec
);
11392 Set_Never_Set_In_Source
(Formal
, True);
11393 Enter_Name
(Formal
);
11395 -- Case of ordinary parameters
11397 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
11398 Find_Type
(Parameter_Type
(Param_Spec
));
11399 Ptype
:= Parameter_Type
(Param_Spec
);
11401 if Ptype
= Error
then
11405 Formal_Type
:= Entity
(Ptype
);
11407 if Is_Incomplete_Type
(Formal_Type
)
11409 (Is_Class_Wide_Type
(Formal_Type
)
11410 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
11412 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
11413 -- primitive operations, as long as their completion is
11414 -- in the same declarative part. If in the private part
11415 -- this means that the type cannot be a Taft-amendment type.
11416 -- Check is done on package exit. For access to subprograms,
11417 -- the use is legal for Taft-amendment types.
11419 -- Ada 2012: tagged incomplete types are allowed as generic
11420 -- formal types. They do not introduce dependencies and the
11421 -- corresponding generic subprogram does not have a delayed
11422 -- freeze, because it does not need a freeze node. However,
11423 -- it is still the case that untagged incomplete types cannot
11424 -- be Taft-amendment types and must be completed in private
11425 -- part, so the subprogram must appear in the list of private
11426 -- dependents of the type.
11428 if Is_Tagged_Type
(Formal_Type
)
11429 or else (Ada_Version
>= Ada_2012
11430 and then not From_Limited_With
(Formal_Type
)
11431 and then not Is_Generic_Type
(Formal_Type
))
11433 if Ekind
(Scope
(Current_Scope
)) = E_Package
11434 and then not Is_Generic_Type
(Formal_Type
)
11435 and then not Is_Class_Wide_Type
(Formal_Type
)
11438 (Parent
(T
), N_Access_Function_Definition
,
11439 N_Access_Procedure_Definition
)
11441 Append_Elmt
(Current_Scope
,
11442 Private_Dependents
(Base_Type
(Formal_Type
)));
11444 -- Freezing is delayed to ensure that Register_Prim
11445 -- will get called for this operation, which is needed
11446 -- in cases where static dispatch tables aren't built.
11447 -- (Note that the same is done for controlling access
11448 -- parameter cases in function Access_Definition.)
11450 if not Is_Thunk
(Current_Scope
) then
11451 Set_Has_Delayed_Freeze
(Current_Scope
);
11456 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
11457 N_Access_Procedure_Definition
)
11459 -- AI05-0151: Tagged incomplete types are allowed in all
11460 -- formal parts. Untagged incomplete types are not allowed
11461 -- in bodies. Limited views of either kind are not allowed
11462 -- if there is no place at which the non-limited view can
11463 -- become available.
11465 -- Incomplete formal untagged types are not allowed in
11466 -- subprogram bodies (but are legal in their declarations).
11467 -- This excludes bodies created for null procedures, which
11468 -- are basic declarations.
11470 if Is_Generic_Type
(Formal_Type
)
11471 and then not Is_Tagged_Type
(Formal_Type
)
11472 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
11475 ("invalid use of formal incomplete type", Param_Spec
);
11477 elsif Ada_Version
>= Ada_2012
then
11478 if Is_Tagged_Type
(Formal_Type
)
11479 and then (not From_Limited_With
(Formal_Type
)
11480 or else not In_Package_Body
)
11484 elsif Nkind_In
(Context
, N_Accept_Statement
,
11485 N_Accept_Alternative
,
11487 or else (Nkind
(Context
) = N_Subprogram_Body
11488 and then Comes_From_Source
(Context
))
11491 ("invalid use of untagged incomplete type &",
11492 Ptype
, Formal_Type
);
11497 ("invalid use of incomplete type&",
11498 Param_Spec
, Formal_Type
);
11500 -- Further checks on the legality of incomplete types
11501 -- in formal parts are delayed until the freeze point
11502 -- of the enclosing subprogram or access to subprogram.
11506 elsif Ekind
(Formal_Type
) = E_Void
then
11508 ("premature use of&",
11509 Parameter_Type
(Param_Spec
), Formal_Type
);
11512 -- Ada 2012 (AI-142): Handle aliased parameters
11514 if Ada_Version
>= Ada_2012
11515 and then Aliased_Present
(Param_Spec
)
11517 Set_Is_Aliased
(Formal
);
11520 -- Ada 2005 (AI-231): Create and decorate an internal subtype
11521 -- declaration corresponding to the null-excluding type of the
11522 -- formal in the enclosing scope. Finally, replace the parameter
11523 -- type of the formal with the internal subtype.
11525 if Ada_Version
>= Ada_2005
11526 and then Null_Exclusion_Present
(Param_Spec
)
11528 if not Is_Access_Type
(Formal_Type
) then
11530 ("`NOT NULL` allowed only for an access type", Param_Spec
);
11533 if Can_Never_Be_Null
(Formal_Type
)
11534 and then Comes_From_Source
(Related_Nod
)
11537 ("`NOT NULL` not allowed (& already excludes null)",
11538 Param_Spec
, Formal_Type
);
11542 Create_Null_Excluding_Itype
11544 Related_Nod
=> Related_Nod
,
11545 Scope_Id
=> Scope
(Current_Scope
));
11547 -- If the designated type of the itype is an itype that is
11548 -- not frozen yet, we set the Has_Delayed_Freeze attribute
11549 -- on the access subtype, to prevent order-of-elaboration
11550 -- issues in the backend.
11553 -- type T is access procedure;
11554 -- procedure Op (O : not null T);
11556 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
11558 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
11560 Set_Has_Delayed_Freeze
(Formal_Type
);
11565 -- An access formal type
11569 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
11571 -- No need to continue if we already notified errors
11573 if not Present
(Formal_Type
) then
11577 -- Ada 2005 (AI-254)
11580 AD
: constant Node_Id
:=
11581 Access_To_Subprogram_Definition
11582 (Parameter_Type
(Param_Spec
));
11584 if Present
(AD
) and then Protected_Present
(AD
) then
11586 Replace_Anonymous_Access_To_Protected_Subprogram
11592 Set_Etype
(Formal
, Formal_Type
);
11594 -- Deal with default expression if present
11596 Default
:= Expression
(Param_Spec
);
11598 if Present
(Default
) then
11599 Check_SPARK_05_Restriction
11600 ("default expression is not allowed", Default
);
11602 if Out_Present
(Param_Spec
) then
11604 ("default initialization only allowed for IN parameters",
11608 -- Do the special preanalysis of the expression (see section on
11609 -- "Handling of Default Expressions" in the spec of package Sem).
11611 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
11613 -- An access to constant cannot be the default for
11614 -- an access parameter that is an access to variable.
11616 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11617 and then not Is_Access_Constant
(Formal_Type
)
11618 and then Is_Access_Type
(Etype
(Default
))
11619 and then Is_Access_Constant
(Etype
(Default
))
11622 ("formal that is access to variable cannot be initialized "
11623 & "with an access-to-constant expression", Default
);
11626 -- Check that the designated type of an access parameter's default
11627 -- is not a class-wide type unless the parameter's designated type
11628 -- is also class-wide.
11630 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11631 and then not Designates_From_Limited_With
(Formal_Type
)
11632 and then Is_Class_Wide_Default
(Default
)
11633 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
11636 ("access to class-wide expression not allowed here", Default
);
11639 -- Check incorrect use of dynamically tagged expressions
11641 if Is_Tagged_Type
(Formal_Type
) then
11642 Check_Dynamically_Tagged_Expression
11644 Typ
=> Formal_Type
,
11645 Related_Nod
=> Default
);
11649 -- Ada 2005 (AI-231): Static checks
11651 if Ada_Version
>= Ada_2005
11652 and then Is_Access_Type
(Etype
(Formal
))
11653 and then Can_Never_Be_Null
(Etype
(Formal
))
11655 Null_Exclusion_Static_Checks
(Param_Spec
);
11658 -- The following checks are relevant only when SPARK_Mode is on as
11659 -- these are not standard Ada legality rules.
11661 if SPARK_Mode
= On
then
11662 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
11664 -- A function cannot have a parameter of mode IN OUT or OUT
11667 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
11669 ("function cannot have parameter of mode `OUT` or "
11670 & "`IN OUT`", Formal
);
11673 -- A procedure cannot have an effectively volatile formal
11674 -- parameter of mode IN because it behaves as a constant
11675 -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4)
11677 elsif Ekind
(Scope
(Formal
)) = E_Procedure
11678 and then Ekind
(Formal
) = E_In_Parameter
11679 and then Is_Effectively_Volatile
(Formal
)
11682 ("formal parameter of mode `IN` cannot be volatile", Formal
);
11690 -- If this is the formal part of a function specification, analyze the
11691 -- subtype mark in the context where the formals are visible but not
11692 -- yet usable, and may hide outer homographs.
11694 if Nkind
(Related_Nod
) = N_Function_Specification
then
11695 Analyze_Return_Type
(Related_Nod
);
11698 -- Now set the kind (mode) of each formal
11700 Param_Spec
:= First
(T
);
11701 while Present
(Param_Spec
) loop
11702 Formal
:= Defining_Identifier
(Param_Spec
);
11703 Set_Formal_Mode
(Formal
);
11705 if Ekind
(Formal
) = E_In_Parameter
then
11706 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
11708 if Present
(Expression
(Param_Spec
)) then
11709 Default
:= Expression
(Param_Spec
);
11711 if Is_Scalar_Type
(Etype
(Default
)) then
11712 if Nkind
(Parameter_Type
(Param_Spec
)) /=
11713 N_Access_Definition
11715 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
11719 (Related_Nod
, Parameter_Type
(Param_Spec
));
11722 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
11726 elsif Ekind
(Formal
) = E_Out_Parameter
then
11727 Num_Out_Params
:= Num_Out_Params
+ 1;
11729 if Num_Out_Params
= 1 then
11730 First_Out_Param
:= Formal
;
11733 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
11734 Num_Out_Params
:= Num_Out_Params
+ 1;
11737 -- Skip remaining processing if formal type was in error
11739 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
11740 goto Next_Parameter
;
11743 -- Force call by reference if aliased
11746 Conv
: constant Convention_Id
:= Convention
(Etype
(Formal
));
11748 if Is_Aliased
(Formal
) then
11749 Set_Mechanism
(Formal
, By_Reference
);
11751 -- Warn if user asked this to be passed by copy
11753 if Conv
= Convention_Ada_Pass_By_Copy
then
11755 ("cannot pass aliased parameter & by copy??", Formal
);
11758 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
11760 elsif Conv
= Convention_Ada_Pass_By_Copy
then
11761 Set_Mechanism
(Formal
, By_Copy
);
11763 elsif Conv
= Convention_Ada_Pass_By_Reference
then
11764 Set_Mechanism
(Formal
, By_Reference
);
11772 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
11773 Set_Is_Only_Out_Parameter
(First_Out_Param
);
11775 end Process_Formals
;
11777 ----------------------------
11778 -- Reference_Body_Formals --
11779 ----------------------------
11781 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
11786 if Error_Posted
(Spec
) then
11790 -- Iterate over both lists. They may be of different lengths if the two
11791 -- specs are not conformant.
11793 Fs
:= First_Formal
(Spec
);
11794 Fb
:= First_Formal
(Bod
);
11795 while Present
(Fs
) and then Present
(Fb
) loop
11796 Generate_Reference
(Fs
, Fb
, 'b');
11798 if Style_Check
then
11799 Style
.Check_Identifier
(Fb
, Fs
);
11802 Set_Spec_Entity
(Fb
, Fs
);
11803 Set_Referenced
(Fs
, False);
11807 end Reference_Body_Formals
;
11809 -------------------------
11810 -- Set_Actual_Subtypes --
11811 -------------------------
11813 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
11815 Formal
: Entity_Id
;
11817 First_Stmt
: Node_Id
:= Empty
;
11818 AS_Needed
: Boolean;
11821 -- If this is an empty initialization procedure, no need to create
11822 -- actual subtypes (small optimization).
11824 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
11827 -- Within a predicate function we do not want to generate local
11828 -- subtypes that may generate nested predicate functions.
11830 elsif Is_Subprogram
(Subp
) and then Is_Predicate_Function
(Subp
) then
11834 -- The subtype declarations may freeze the formals. The body generated
11835 -- for an expression function is not a freeze point, so do not emit
11836 -- these declarations (small loss of efficiency in rare cases).
11838 if Nkind
(N
) = N_Subprogram_Body
11839 and then Was_Expression_Function
(N
)
11844 Formal
:= First_Formal
(Subp
);
11845 while Present
(Formal
) loop
11846 T
:= Etype
(Formal
);
11848 -- We never need an actual subtype for a constrained formal
11850 if Is_Constrained
(T
) then
11851 AS_Needed
:= False;
11853 -- If we have unknown discriminants, then we do not need an actual
11854 -- subtype, or more accurately we cannot figure it out. Note that
11855 -- all class-wide types have unknown discriminants.
11857 elsif Has_Unknown_Discriminants
(T
) then
11858 AS_Needed
:= False;
11860 -- At this stage we have an unconstrained type that may need an
11861 -- actual subtype. For sure the actual subtype is needed if we have
11862 -- an unconstrained array type. However, in an instance, the type
11863 -- may appear as a subtype of the full view, while the actual is
11864 -- in fact private (in which case no actual subtype is needed) so
11865 -- check the kind of the base type.
11867 elsif Is_Array_Type
(Base_Type
(T
)) then
11870 -- The only other case needing an actual subtype is an unconstrained
11871 -- record type which is an IN parameter (we cannot generate actual
11872 -- subtypes for the OUT or IN OUT case, since an assignment can
11873 -- change the discriminant values. However we exclude the case of
11874 -- initialization procedures, since discriminants are handled very
11875 -- specially in this context, see the section entitled "Handling of
11876 -- Discriminants" in Einfo.
11878 -- We also exclude the case of Discrim_SO_Functions (functions used
11879 -- in front-end layout mode for size/offset values), since in such
11880 -- functions only discriminants are referenced, and not only are such
11881 -- subtypes not needed, but they cannot always be generated, because
11882 -- of order of elaboration issues.
11884 elsif Is_Record_Type
(T
)
11885 and then Ekind
(Formal
) = E_In_Parameter
11886 and then Chars
(Formal
) /= Name_uInit
11887 and then not Is_Unchecked_Union
(T
)
11888 and then not Is_Discrim_SO_Function
(Subp
)
11892 -- All other cases do not need an actual subtype
11895 AS_Needed
:= False;
11898 -- Generate actual subtypes for unconstrained arrays and
11899 -- unconstrained discriminated records.
11902 if Nkind
(N
) = N_Accept_Statement
then
11904 -- If expansion is active, the formal is replaced by a local
11905 -- variable that renames the corresponding entry of the
11906 -- parameter block, and it is this local variable that may
11907 -- require an actual subtype.
11909 if Expander_Active
then
11910 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
11912 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11915 if Present
(Handled_Statement_Sequence
(N
)) then
11917 First
(Statements
(Handled_Statement_Sequence
(N
)));
11918 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
11919 Mark_Rewrite_Insertion
(Decl
);
11921 -- If the accept statement has no body, there will be no
11922 -- reference to the actuals, so no need to compute actual
11929 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11930 Prepend
(Decl
, Declarations
(N
));
11931 Mark_Rewrite_Insertion
(Decl
);
11934 -- The declaration uses the bounds of an existing object, and
11935 -- therefore needs no constraint checks.
11937 Analyze
(Decl
, Suppress
=> All_Checks
);
11938 Set_Is_Actual_Subtype
(Defining_Identifier
(Decl
));
11940 -- We need to freeze manually the generated type when it is
11941 -- inserted anywhere else than in a declarative part.
11943 if Present
(First_Stmt
) then
11944 Insert_List_Before_And_Analyze
(First_Stmt
,
11945 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11947 -- Ditto if the type has a dynamic predicate, because the
11948 -- generated function will mention the actual subtype. The
11949 -- predicate may come from an explicit aspect of be inherited.
11951 elsif Has_Predicates
(T
) then
11952 Insert_List_Before_And_Analyze
(Decl
,
11953 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11956 if Nkind
(N
) = N_Accept_Statement
11957 and then Expander_Active
11959 Set_Actual_Subtype
(Renamed_Object
(Formal
),
11960 Defining_Identifier
(Decl
));
11962 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
11966 Next_Formal
(Formal
);
11968 end Set_Actual_Subtypes
;
11970 ---------------------
11971 -- Set_Formal_Mode --
11972 ---------------------
11974 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
11975 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
11976 Id
: constant Entity_Id
:= Scope
(Formal_Id
);
11979 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
11980 -- since we ensure that corresponding actuals are always valid at the
11981 -- point of the call.
11983 if Out_Present
(Spec
) then
11984 if Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
11985 or else Is_Subprogram_Or_Generic_Subprogram
(Id
)
11987 Set_Has_Out_Or_In_Out_Parameter
(Id
, True);
11990 if Ekind_In
(Id
, E_Function
, E_Generic_Function
) then
11992 -- [IN] OUT parameters allowed for functions in Ada 2012
11994 if Ada_Version
>= Ada_2012
then
11996 -- Even in Ada 2012 operators can only have IN parameters
11998 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
11999 Error_Msg_N
("operators can only have IN parameters", Spec
);
12002 if In_Present
(Spec
) then
12003 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
12005 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
12008 -- But not in earlier versions of Ada
12011 Error_Msg_N
("functions can only have IN parameters", Spec
);
12012 Set_Ekind
(Formal_Id
, E_In_Parameter
);
12015 elsif In_Present
(Spec
) then
12016 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
12019 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
12020 Set_Never_Set_In_Source
(Formal_Id
, True);
12021 Set_Is_True_Constant
(Formal_Id
, False);
12022 Set_Current_Value
(Formal_Id
, Empty
);
12026 Set_Ekind
(Formal_Id
, E_In_Parameter
);
12029 -- Set Is_Known_Non_Null for access parameters since the language
12030 -- guarantees that access parameters are always non-null. We also set
12031 -- Can_Never_Be_Null, since there is no way to change the value.
12033 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
12035 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
12036 -- null; In Ada 2005, only if then null_exclusion is explicit.
12038 if Ada_Version
< Ada_2005
12039 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
12041 Set_Is_Known_Non_Null
(Formal_Id
);
12042 Set_Can_Never_Be_Null
(Formal_Id
);
12045 -- Ada 2005 (AI-231): Null-exclusion access subtype
12047 elsif Is_Access_Type
(Etype
(Formal_Id
))
12048 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
12050 Set_Is_Known_Non_Null
(Formal_Id
);
12052 -- We can also set Can_Never_Be_Null (thus preventing some junk
12053 -- access checks) for the case of an IN parameter, which cannot
12054 -- be changed, or for an IN OUT parameter, which can be changed but
12055 -- not to a null value. But for an OUT parameter, the initial value
12056 -- passed in can be null, so we can't set this flag in that case.
12058 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
12059 Set_Can_Never_Be_Null
(Formal_Id
);
12063 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
12064 Set_Formal_Validity
(Formal_Id
);
12065 end Set_Formal_Mode
;
12067 -------------------------
12068 -- Set_Formal_Validity --
12069 -------------------------
12071 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
12073 -- If no validity checking, then we cannot assume anything about the
12074 -- validity of parameters, since we do not know there is any checking
12075 -- of the validity on the call side.
12077 if not Validity_Checks_On
then
12080 -- If validity checking for parameters is enabled, this means we are
12081 -- not supposed to make any assumptions about argument values.
12083 elsif Validity_Check_Parameters
then
12086 -- If we are checking in parameters, we will assume that the caller is
12087 -- also checking parameters, so we can assume the parameter is valid.
12089 elsif Ekind
(Formal_Id
) = E_In_Parameter
12090 and then Validity_Check_In_Params
12092 Set_Is_Known_Valid
(Formal_Id
, True);
12094 -- Similar treatment for IN OUT parameters
12096 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
12097 and then Validity_Check_In_Out_Params
12099 Set_Is_Known_Valid
(Formal_Id
, True);
12101 end Set_Formal_Validity
;
12103 ------------------------
12104 -- Subtype_Conformant --
12105 ------------------------
12107 function Subtype_Conformant
12108 (New_Id
: Entity_Id
;
12109 Old_Id
: Entity_Id
;
12110 Skip_Controlling_Formals
: Boolean := False) return Boolean
12114 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
12115 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12117 end Subtype_Conformant
;
12119 ---------------------
12120 -- Type_Conformant --
12121 ---------------------
12123 function Type_Conformant
12124 (New_Id
: Entity_Id
;
12125 Old_Id
: Entity_Id
;
12126 Skip_Controlling_Formals
: Boolean := False) return Boolean
12130 May_Hide_Profile
:= False;
12132 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
12133 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12135 end Type_Conformant
;
12137 -------------------------------
12138 -- Valid_Operator_Definition --
12139 -------------------------------
12141 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
12144 Id
: constant Name_Id
:= Chars
(Designator
);
12148 F
:= First_Formal
(Designator
);
12149 while Present
(F
) loop
12152 if Present
(Default_Value
(F
)) then
12154 ("default values not allowed for operator parameters",
12157 -- For function instantiations that are operators, we must check
12158 -- separately that the corresponding generic only has in-parameters.
12159 -- For subprogram declarations this is done in Set_Formal_Mode. Such
12160 -- an error could not arise in earlier versions of the language.
12162 elsif Ekind
(F
) /= E_In_Parameter
then
12163 Error_Msg_N
("operators can only have IN parameters", F
);
12169 -- Verify that user-defined operators have proper number of arguments
12170 -- First case of operators which can only be unary
12172 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
12175 -- Case of operators which can be unary or binary
12177 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
12178 N_OK
:= (N
in 1 .. 2);
12180 -- All other operators can only be binary
12188 ("incorrect number of arguments for operator", Designator
);
12192 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
12193 and then not Is_Intrinsic_Subprogram
(Designator
)
12196 ("explicit definition of inequality not allowed", Designator
);
12198 end Valid_Operator_Definition
;