1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, 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_Disp
; use Exp_Disp
;
40 with Exp_Tss
; use Exp_Tss
;
41 with Exp_Util
; use Exp_Util
;
42 with Freeze
; use Freeze
;
43 with Ghost
; use Ghost
;
44 with Inline
; use Inline
;
45 with Itypes
; use Itypes
;
46 with Lib
.Xref
; use Lib
.Xref
;
47 with Layout
; use Layout
;
48 with Namet
; use Namet
;
50 with Nlists
; use Nlists
;
51 with Nmake
; use Nmake
;
53 with Output
; use Output
;
54 with Restrict
; use Restrict
;
55 with Rident
; use Rident
;
56 with Rtsfind
; use Rtsfind
;
58 with Sem_Aux
; use Sem_Aux
;
59 with Sem_Cat
; use Sem_Cat
;
60 with Sem_Ch3
; use Sem_Ch3
;
61 with Sem_Ch4
; use Sem_Ch4
;
62 with Sem_Ch5
; use Sem_Ch5
;
63 with Sem_Ch8
; use Sem_Ch8
;
64 with Sem_Ch9
; use Sem_Ch9
;
65 with Sem_Ch10
; use Sem_Ch10
;
66 with Sem_Ch12
; use Sem_Ch12
;
67 with Sem_Ch13
; use Sem_Ch13
;
68 with Sem_Dim
; use Sem_Dim
;
69 with Sem_Disp
; use Sem_Disp
;
70 with Sem_Dist
; use Sem_Dist
;
71 with Sem_Elim
; use Sem_Elim
;
72 with Sem_Eval
; use Sem_Eval
;
73 with Sem_Mech
; use Sem_Mech
;
74 with Sem_Prag
; use Sem_Prag
;
75 with Sem_Res
; use Sem_Res
;
76 with Sem_Util
; use Sem_Util
;
77 with Sem_Type
; use Sem_Type
;
78 with Sem_Warn
; use Sem_Warn
;
79 with Sinput
; use Sinput
;
80 with Stand
; use Stand
;
81 with Sinfo
; use Sinfo
;
82 with Sinfo
.CN
; use Sinfo
.CN
;
83 with Snames
; use Snames
;
84 with Stringt
; use Stringt
;
86 with Stylesw
; use Stylesw
;
87 with Tbuild
; use Tbuild
;
88 with Uintp
; use Uintp
;
89 with Urealp
; use Urealp
;
90 with Validsw
; use Validsw
;
92 package body Sem_Ch6
is
94 May_Hide_Profile
: Boolean := False;
95 -- This flag is used to indicate that two formals in two subprograms being
96 -- checked for conformance differ only in that one is an access parameter
97 -- while the other is of a general access type with the same designated
98 -- type. In this case, if the rest of the signatures match, a call to
99 -- either subprogram may be ambiguous, which is worth a warning. The flag
100 -- is set in Compatible_Types, and the warning emitted in
101 -- New_Overloaded_Entity.
103 -----------------------
104 -- Local Subprograms --
105 -----------------------
107 procedure Analyze_Function_Return
(N
: Node_Id
);
108 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
109 -- applies to a [generic] function.
111 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
112 -- Analyze a generic subprogram body. N is the body to be analyzed, and
113 -- Gen_Id is the defining entity Id for the corresponding spec.
115 procedure Analyze_Null_Procedure
117 Is_Completion
: out Boolean);
118 -- A null procedure can be a declaration or (Ada 2012) a completion
120 procedure Analyze_Return_Statement
(N
: Node_Id
);
121 -- Common processing for simple and extended return statements
123 procedure Analyze_Return_Type
(N
: Node_Id
);
124 -- Subsidiary to Process_Formals: analyze subtype mark in function
125 -- specification in a context where the formals are visible and hide
128 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
129 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
130 -- that we can use RETURN but not skip the debug output at the end.
132 function Can_Override_Operator
(Subp
: Entity_Id
) return Boolean;
133 -- Returns true if Subp can override a predefined operator.
135 procedure Check_Conformance
138 Ctype
: Conformance_Type
;
140 Conforms
: out Boolean;
141 Err_Loc
: Node_Id
:= Empty
;
142 Get_Inst
: Boolean := False;
143 Skip_Controlling_Formals
: Boolean := False);
144 -- Given two entities, this procedure checks that the profiles associated
145 -- with these entities meet the conformance criterion given by the third
146 -- parameter. If they conform, Conforms is set True and control returns
147 -- to the caller. If they do not conform, Conforms is set to False, and
148 -- in addition, if Errmsg is True on the call, proper messages are output
149 -- to complain about the conformance failure. If Err_Loc is non_Empty
150 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
151 -- error messages are placed on the appropriate part of the construct
152 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
153 -- against a formal access-to-subprogram type so Get_Instance_Of must
156 procedure Check_Limited_Return
160 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning limited
161 -- types. Used only for simple return statements. Expr is the expression
164 procedure Check_Subprogram_Order
(N
: Node_Id
);
165 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
166 -- the alpha ordering rule for N if this ordering requirement applicable.
168 procedure Check_Returns
172 Proc
: Entity_Id
:= Empty
);
173 -- Called to check for missing return statements in a function body, or for
174 -- returns present in a procedure body which has No_Return set. HSS is the
175 -- handled statement sequence for the subprogram body. This procedure
176 -- checks all flow paths to make sure they either have return (Mode = 'F',
177 -- used for functions) or do not have a return (Mode = 'P', used for
178 -- No_Return procedures). The flag Err is set if there are any control
179 -- paths not explicitly terminated by a return in the function case, and is
180 -- True otherwise. Proc is the entity for the procedure case and is used
181 -- in posting the warning message.
183 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
184 -- In Ada 2012, a primitive equality operator on an untagged record type
185 -- must appear before the type is frozen, and have the same visibility as
186 -- that of the type. This procedure checks that this rule is met, and
187 -- otherwise emits an error on the subprogram declaration and a warning
188 -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode,
189 -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier
190 -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility
191 -- is set, otherwise the call has no effect.
193 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
194 -- This procedure makes S, a new overloaded entity, into the first visible
195 -- entity with that name.
197 function Is_Non_Overriding_Operation
199 New_E
: Entity_Id
) return Boolean;
200 -- Enforce the rule given in 12.3(18): a private operation in an instance
201 -- overrides an inherited operation only if the corresponding operation
202 -- was overriding in the generic. This needs to be checked for primitive
203 -- operations of types derived (in the generic unit) from formal private
204 -- or formal derived types.
206 procedure Make_Inequality_Operator
(S
: Entity_Id
);
207 -- Create the declaration for an inequality operator that is implicitly
208 -- created by a user-defined equality operator that yields a boolean.
210 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
211 -- Formal_Id is an formal parameter entity. This procedure deals with
212 -- setting the proper validity status for this entity, which depends on
213 -- the kind of parameter and the validity checking mode.
215 ---------------------------------------------
216 -- Analyze_Abstract_Subprogram_Declaration --
217 ---------------------------------------------
219 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
220 Scop
: constant Entity_Id
:= Current_Scope
;
221 Subp_Id
: constant Entity_Id
:=
222 Analyze_Subprogram_Specification
(Specification
(N
));
225 Check_SPARK_05_Restriction
("abstract subprogram is not allowed", N
);
227 Generate_Definition
(Subp_Id
);
229 -- Set the SPARK mode from the current context (may be overwritten later
230 -- with explicit pragma).
232 Set_SPARK_Pragma
(Subp_Id
, SPARK_Mode_Pragma
);
233 Set_SPARK_Pragma_Inherited
(Subp_Id
);
235 -- Preserve relevant elaboration-related attributes of the context which
236 -- are no longer available or very expensive to recompute once analysis,
237 -- resolution, and expansion are over.
239 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
372 and then Scope_Within_Or_Same
(Scope
(Typ
), Def_Id
)
377 -- This provides a better error message than generating
378 -- primitives whose compilation fails much later. Refine
379 -- the error message if possible.
381 Check_Fully_Declared
(Typ
, Node
);
383 if Error_Posted
(Node
) then
384 if Has_Private_Component
(Typ
)
385 and then not Is_Private_Type
(Typ
)
387 Error_Msg_NE
("\type& has private component", Node
, Typ
);
391 Freeze_Before
(N
, Typ
);
393 end Check_And_Freeze_Type
;
395 -- Start of processing for Freeze_Type_Refs
398 -- Check that a type referenced by an entity can be frozen
400 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
401 Check_And_Freeze_Type
(Etype
(Entity
(Node
)));
403 -- Check that the enclosing record type can be frozen
405 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
406 Check_And_Freeze_Type
(Scope
(Entity
(Node
)));
409 -- Freezing an access type does not freeze the designated type,
410 -- but freezing conversions between access to interfaces requires
411 -- that the interface types themselves be frozen, so that dispatch
412 -- table entities are properly created.
414 -- Unclear whether a more general rule is needed ???
416 elsif Nkind
(Node
) = N_Type_Conversion
417 and then Is_Access_Type
(Etype
(Node
))
418 and then Is_Interface
(Designated_Type
(Etype
(Node
)))
420 Check_And_Freeze_Type
(Designated_Type
(Etype
(Node
)));
423 -- No point in posting several errors on the same expression
425 if Serious_Errors_Detected
> 0 then
430 end Freeze_Type_Refs
;
432 procedure Freeze_References
is new Traverse_Proc
(Freeze_Type_Refs
);
436 Saved_First_Entity
: constant Entity_Id
:= First_Entity
(Def_Id
);
437 Saved_Last_Entity
: constant Entity_Id
:= Last_Entity
(Def_Id
);
438 Dup_Expr
: constant Node_Id
:= Cloned_Expression
;
440 -- Start of processing for Freeze_Expr_Types
443 -- Preanalyze a duplicate of the expression to have available the
444 -- minimum decoration needed to locate referenced unfrozen types
445 -- without adding any decoration to the function expression. This
446 -- preanalysis is performed with errors disabled to avoid reporting
447 -- spurious errors on Ghost entities (since the expression is not
451 Install_Formals
(Def_Id
);
452 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
454 Preanalyze_Spec_Expression
(Dup_Expr
, Etype
(Def_Id
));
456 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
459 -- Restore certain attributes of Def_Id since the preanalysis may
460 -- have introduced itypes to this scope, thus modifying attributes
461 -- First_Entity and Last_Entity.
463 Set_First_Entity
(Def_Id
, Saved_First_Entity
);
464 Set_Last_Entity
(Def_Id
, Saved_Last_Entity
);
466 if Present
(Last_Entity
(Def_Id
)) then
467 Set_Next_Entity
(Last_Entity
(Def_Id
), Empty
);
470 -- Freeze all types referenced in the expression
472 Freeze_References
(Dup_Expr
);
473 end Freeze_Expr_Types
;
483 Def_Id
: Entity_Id
:= Empty
;
485 -- If the expression is a completion, Prev is the entity whose
486 -- declaration is completed. Def_Id is needed to analyze the spec.
488 -- Start of processing for Analyze_Expression_Function
491 -- This is one of the occasions on which we transform the tree during
492 -- semantic analysis. If this is a completion, transform the expression
493 -- function into an equivalent subprogram body, and analyze it.
495 -- Expression functions are inlined unconditionally. The back-end will
496 -- determine whether this is possible.
498 Inline_Processing_Required
:= True;
500 -- Create a specification for the generated body. This must be done
501 -- prior to the analysis of the initial declaration.
503 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
504 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
506 -- If there are previous overloadable entities with the same name,
507 -- check whether any of them is completed by the expression function.
508 -- In a generic context a formal subprogram has no completion.
511 and then Is_Overloadable
(Prev
)
512 and then not Is_Formal_Subprogram
(Prev
)
514 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
515 Prev
:= Find_Corresponding_Spec
(N
);
517 -- The previous entity may be an expression function as well, in
518 -- which case the redeclaration is illegal.
521 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
522 N_Expression_Function
524 Error_Msg_Sloc
:= Sloc
(Prev
);
525 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
530 Ret
:= Make_Simple_Return_Statement
(LocX
, Expr
);
533 Make_Subprogram_Body
(Loc
,
534 Specification
=> New_Spec
,
535 Declarations
=> Empty_List
,
536 Handled_Statement_Sequence
=>
537 Make_Handled_Sequence_Of_Statements
(LocX
,
538 Statements
=> New_List
(Ret
)));
539 Set_Was_Expression_Function
(New_Body
);
541 -- If the expression completes a generic subprogram, we must create a
542 -- separate node for the body, because at instantiation the original
543 -- node of the generic copy must be a generic subprogram body, and
544 -- cannot be a expression function. Otherwise we just rewrite the
545 -- expression with the non-generic body.
547 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
548 Insert_After
(N
, New_Body
);
550 -- Propagate any aspects or pragmas that apply to the expression
551 -- function to the proper body when the expression function acts
554 if Has_Aspects
(N
) then
555 Move_Aspects
(N
, To
=> New_Body
);
558 Relocate_Pragmas_To_Body
(New_Body
);
560 Rewrite
(N
, Make_Null_Statement
(Loc
));
561 Set_Has_Completion
(Prev
, False);
564 Set_Is_Inlined
(Prev
);
566 -- If the expression function is a completion, the previous declaration
567 -- must come from source. We know already that it appears in the current
568 -- scope. The entity itself may be internally created if within a body
572 and then Is_Overloadable
(Prev
)
573 and then not Is_Formal_Subprogram
(Prev
)
574 and then Comes_From_Source
(Parent
(Prev
))
576 Set_Has_Completion
(Prev
, False);
577 Set_Is_Inlined
(Prev
);
579 -- AI12-0103: Expression functions that are a completion freeze their
580 -- expression but don't freeze anything else (unlike regular bodies).
582 -- Note that we cannot defer this freezing to the analysis of the
583 -- expression itself, because a freeze node might appear in a nested
584 -- scope, leading to an elaboration order issue in gigi.
585 -- As elsewhere, we do not emit freeze nodes within a generic unit.
587 if not Inside_A_Generic
then
588 Freeze_Expr_Types
(Def_Id
);
591 -- For navigation purposes, indicate that the function is a body
593 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
594 Rewrite
(N
, New_Body
);
596 -- Remove any existing aspects from the original node because the act
597 -- of rewriting causes the list to be shared between the two nodes.
599 Orig_N
:= Original_Node
(N
);
600 Remove_Aspects
(Orig_N
);
602 -- Propagate any pragmas that apply to expression function to the
603 -- proper body when the expression function acts as a completion.
604 -- Aspects are automatically transfered because of node rewriting.
606 Relocate_Pragmas_To_Body
(N
);
609 -- Once the aspects of the generated body have been analyzed, create
610 -- a copy for ASIS purposes and associate it with the original node.
612 if Has_Aspects
(N
) then
613 Set_Aspect_Specifications
(Orig_N
,
614 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
617 -- Prev is the previous entity with the same name, but it is can
618 -- be an unrelated spec that is not completed by the expression
619 -- function. In that case the relevant entity is the one in the body.
620 -- Not clear that the backend can inline it in this case ???
622 if Has_Completion
(Prev
) then
624 -- The formals of the expression function are body formals,
625 -- and do not appear in the ali file, which will only contain
626 -- references to the formals of the original subprogram spec.
633 F1
:= First_Formal
(Def_Id
);
634 F2
:= First_Formal
(Prev
);
636 while Present
(F1
) loop
637 Set_Spec_Entity
(F1
, F2
);
644 Set_Is_Inlined
(Defining_Entity
(New_Body
));
647 -- If this is not a completion, create both a declaration and a body, so
648 -- that the expression can be inlined whenever possible.
651 -- An expression function that is not a completion is not a
652 -- subprogram declaration, and thus cannot appear in a protected
655 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
657 ("an expression function is not a legal protected operation", N
);
660 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
662 -- Remove any existing aspects from the original node because the act
663 -- of rewriting causes the list to be shared between the two nodes.
665 Orig_N
:= Original_Node
(N
);
666 Remove_Aspects
(Orig_N
);
670 -- Once the aspects of the generated spec have been analyzed, create
671 -- a copy for ASIS purposes and associate it with the original node.
673 if Has_Aspects
(N
) then
674 Set_Aspect_Specifications
(Orig_N
,
675 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
678 -- If aspect SPARK_Mode was specified on the body, it needs to be
679 -- repeated both on the generated spec and the body.
681 Asp
:= Find_Aspect
(Defining_Unit_Name
(Spec
), Aspect_SPARK_Mode
);
683 if Present
(Asp
) then
684 Asp
:= New_Copy_Tree
(Asp
);
685 Set_Analyzed
(Asp
, False);
686 Set_Aspect_Specifications
(New_Body
, New_List
(Asp
));
689 Def_Id
:= Defining_Entity
(N
);
690 Set_Is_Inlined
(Def_Id
);
692 -- Establish the linkages between the spec and the body. These are
693 -- used when the expression function acts as the prefix of attribute
694 -- 'Access in order to freeze the original expression which has been
695 -- moved to the generated body.
697 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
698 Set_Corresponding_Spec
(New_Body
, Def_Id
);
700 -- Within a generic pre-analyze the original expression for name
701 -- capture. The body is also generated but plays no role in
702 -- this because it is not part of the original source.
704 if Inside_A_Generic
then
705 Set_Has_Completion
(Def_Id
);
707 Install_Formals
(Def_Id
);
708 Preanalyze_Spec_Expression
(Expr
, Etype
(Def_Id
));
712 -- To prevent premature freeze action, insert the new body at the end
713 -- of the current declarations, or at the end of the package spec.
714 -- However, resolve usage names now, to prevent spurious visibility
715 -- on later entities. Note that the function can now be called in
716 -- the current declarative part, which will appear to be prior to
717 -- the presence of the body in the code. There are nevertheless no
718 -- order of elaboration issues because all name resolution has taken
719 -- place at the point of declaration.
722 Decls
: List_Id
:= List_Containing
(N
);
723 Expr
: constant Node_Id
:= Expression
(Ret
);
724 Par
: constant Node_Id
:= Parent
(Decls
);
725 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
728 -- If this is a wrapper created for in an instance for a formal
729 -- subprogram, insert body after declaration, to be analyzed when
730 -- the enclosing instance is analyzed.
733 and then Is_Generic_Actual_Subprogram
(Def_Id
)
735 Insert_After
(N
, New_Body
);
738 if Nkind
(Par
) = N_Package_Specification
739 and then Decls
= Visible_Declarations
(Par
)
740 and then Present
(Private_Declarations
(Par
))
741 and then not Is_Empty_List
(Private_Declarations
(Par
))
743 Decls
:= Private_Declarations
(Par
);
746 Insert_After
(Last
(Decls
), New_Body
);
748 -- Preanalyze the expression if not already done above
750 if not Inside_A_Generic
then
752 Install_Formals
(Def_Id
);
753 Preanalyze_Spec_Expression
(Expr
, Typ
);
754 Check_Limited_Return
(Original_Node
(N
), Expr
, Typ
);
761 -- Check incorrect use of dynamically tagged expression. This doesn't
762 -- fall out automatically when analyzing the generated function body,
763 -- because Check_Dynamically_Tagged_Expression deliberately ignores
764 -- nodes that don't come from source.
767 and then Nkind
(Def_Id
) in N_Has_Etype
768 and then Is_Tagged_Type
(Etype
(Def_Id
))
770 Check_Dynamically_Tagged_Expression
772 Typ
=> Etype
(Def_Id
),
773 Related_Nod
=> Original_Node
(N
));
776 -- If the return expression is a static constant, we suppress warning
777 -- messages on unused formals, which in most cases will be noise.
779 Set_Is_Trivial_Subprogram
780 (Defining_Entity
(New_Body
), Is_OK_Static_Expression
(Expr
));
781 end Analyze_Expression_Function
;
783 ----------------------------------------
784 -- Analyze_Extended_Return_Statement --
785 ----------------------------------------
787 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
789 Check_Compiler_Unit
("extended return statement", N
);
790 Analyze_Return_Statement
(N
);
791 end Analyze_Extended_Return_Statement
;
793 ----------------------------
794 -- Analyze_Function_Call --
795 ----------------------------
797 procedure Analyze_Function_Call
(N
: Node_Id
) is
798 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
799 Func_Nam
: constant Node_Id
:= Name
(N
);
805 -- A call of the form A.B (X) may be an Ada 2005 call, which is
806 -- rewritten as B (A, X). If the rewriting is successful, the call
807 -- has been analyzed and we just return.
809 if Nkind
(Func_Nam
) = N_Selected_Component
810 and then Name
(N
) /= Func_Nam
811 and then Is_Rewrite_Substitution
(N
)
812 and then Present
(Etype
(N
))
817 -- If error analyzing name, then set Any_Type as result type and return
819 if Etype
(Func_Nam
) = Any_Type
then
820 Set_Etype
(N
, Any_Type
);
824 -- Otherwise analyze the parameters
826 if Present
(Actuals
) then
827 Actual
:= First
(Actuals
);
828 while Present
(Actual
) loop
830 Check_Parameterless_Call
(Actual
);
836 end Analyze_Function_Call
;
838 -----------------------------
839 -- Analyze_Function_Return --
840 -----------------------------
842 procedure Analyze_Function_Return
(N
: Node_Id
) is
843 Loc
: constant Source_Ptr
:= Sloc
(N
);
844 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
845 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
847 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
848 -- Function result subtype
850 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
);
851 -- Apply legality rule of 6.5 (5.8) to the access discriminants of an
852 -- aggregate in a return statement.
854 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
855 -- Check that the return_subtype_indication properly matches the result
856 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
858 -----------------------------------
859 -- Check_Aggregate_Accessibility --
860 -----------------------------------
862 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
) is
863 Typ
: constant Entity_Id
:= Etype
(Aggr
);
870 if Is_Record_Type
(Typ
) and then Has_Discriminants
(Typ
) then
871 Discr
:= First_Discriminant
(Typ
);
872 Assoc
:= First
(Component_Associations
(Aggr
));
873 while Present
(Discr
) loop
874 if Ekind
(Etype
(Discr
)) = E_Anonymous_Access_Type
then
875 Expr
:= Expression
(Assoc
);
877 if Nkind
(Expr
) = N_Attribute_Reference
878 and then Attribute_Name
(Expr
) /= Name_Unrestricted_Access
880 Obj
:= Prefix
(Expr
);
881 while Nkind_In
(Obj
, N_Indexed_Component
,
882 N_Selected_Component
)
887 -- Do not check aliased formals or function calls. A
888 -- run-time check may still be needed ???
890 if Is_Entity_Name
(Obj
)
891 and then Comes_From_Source
(Obj
)
893 if Is_Formal
(Entity
(Obj
))
894 and then Is_Aliased
(Entity
(Obj
))
898 elsif Object_Access_Level
(Obj
) >
899 Scope_Depth
(Scope
(Scope_Id
))
902 ("access discriminant in return aggregate would "
903 & "be a dangling reference", Obj
);
909 Next_Discriminant
(Discr
);
912 end Check_Aggregate_Accessibility
;
914 -------------------------------------
915 -- Check_Return_Subtype_Indication --
916 -------------------------------------
918 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
919 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
921 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
922 -- Subtype given in the extended return statement (must match R_Type)
924 Subtype_Ind
: constant Node_Id
:=
925 Object_Definition
(Original_Node
(Obj_Decl
));
927 procedure Error_No_Match
(N
: Node_Id
);
928 -- Output error messages for case where types do not statically
929 -- match. N is the location for the messages.
935 procedure Error_No_Match
(N
: Node_Id
) is
938 ("subtype must statically match function result subtype", N
);
940 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
941 Error_Msg_Node_2
:= R_Type
;
943 ("\predicate of& does not match predicate of&",
948 -- Start of processing for Check_Return_Subtype_Indication
951 -- First, avoid cascaded errors
953 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
957 -- "return access T" case; check that the return statement also has
958 -- "access T", and that the subtypes statically match:
959 -- if this is an access to subprogram the signatures must match.
961 if Is_Anonymous_Access_Type
(R_Type
) then
962 if Is_Anonymous_Access_Type
(R_Stm_Type
) then
963 if Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
965 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
966 Base_Type
(Designated_Type
(R_Type
))
967 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
969 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
973 -- For two anonymous access to subprogram types, the types
974 -- themselves must be type conformant.
976 if not Conforming_Types
977 (R_Stm_Type
, R_Type
, Fully_Conformant
)
979 Error_No_Match
(Subtype_Ind
);
984 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
987 -- If the return object is of an anonymous access type, then report
988 -- an error if the function's result type is not also anonymous.
990 elsif Is_Anonymous_Access_Type
(R_Stm_Type
) then
991 pragma Assert
(not Is_Anonymous_Access_Type
(R_Type
));
993 ("anonymous access not allowed for function with named access "
994 & "result", Subtype_Ind
);
996 -- Subtype indication case: check that the return object's type is
997 -- covered by the result type, and that the subtypes statically match
998 -- when the result subtype is constrained. Also handle record types
999 -- with unknown discriminants for which we have built the underlying
1000 -- record view. Coverage is needed to allow specific-type return
1001 -- objects when the result type is class-wide (see AI05-32).
1003 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
1004 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
1007 (Base_Type
(R_Type
),
1008 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
1010 -- A null exclusion may be present on the return type, on the
1011 -- function specification, on the object declaration or on the
1014 if Is_Access_Type
(R_Type
)
1016 (Can_Never_Be_Null
(R_Type
)
1017 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
1018 Can_Never_Be_Null
(R_Stm_Type
)
1020 Error_No_Match
(Subtype_Ind
);
1023 -- AI05-103: for elementary types, subtypes must statically match
1025 if Is_Constrained
(R_Type
) or else Is_Access_Type
(R_Type
) then
1026 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
1027 Error_No_Match
(Subtype_Ind
);
1031 -- All remaining cases are illegal
1033 -- Note: previous versions of this subprogram allowed the return
1034 -- value to be the ancestor of the return type if the return type
1035 -- was a null extension. This was plainly incorrect.
1039 ("wrong type for return_subtype_indication", Subtype_Ind
);
1041 end Check_Return_Subtype_Indication
;
1043 ---------------------
1044 -- Local Variables --
1045 ---------------------
1050 -- Start of processing for Analyze_Function_Return
1053 Set_Return_Present
(Scope_Id
);
1055 if Nkind
(N
) = N_Simple_Return_Statement
then
1056 Expr
:= Expression
(N
);
1058 -- Guard against a malformed expression. The parser may have tried to
1059 -- recover but the node is not analyzable.
1061 if Nkind
(Expr
) = N_Error
then
1062 Set_Etype
(Expr
, Any_Type
);
1063 Expander_Mode_Save_And_Set
(False);
1067 -- The resolution of a controlled [extension] aggregate associated
1068 -- with a return statement creates a temporary which needs to be
1069 -- finalized on function exit. Wrap the return statement inside a
1070 -- block so that the finalization machinery can detect this case.
1071 -- This early expansion is done only when the return statement is
1072 -- not part of a handled sequence of statements.
1074 if Nkind_In
(Expr
, N_Aggregate
,
1075 N_Extension_Aggregate
)
1076 and then Needs_Finalization
(R_Type
)
1077 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1080 Make_Block_Statement
(Loc
,
1081 Handled_Statement_Sequence
=>
1082 Make_Handled_Sequence_Of_Statements
(Loc
,
1083 Statements
=> New_List
(Relocate_Node
(N
)))));
1091 -- Ada 2005 (AI-251): If the type of the returned object is
1092 -- an access to an interface type then we add an implicit type
1093 -- conversion to force the displacement of the "this" pointer to
1094 -- reference the secondary dispatch table. We cannot delay the
1095 -- generation of this implicit conversion until the expansion
1096 -- because in this case the type resolution changes the decoration
1097 -- of the expression node to match R_Type; by contrast, if the
1098 -- returned object is a class-wide interface type then it is too
1099 -- early to generate here the implicit conversion since the return
1100 -- statement may be rewritten by the expander into an extended
1101 -- return statement whose expansion takes care of adding the
1102 -- implicit type conversion to displace the pointer to the object.
1105 and then Serious_Errors_Detected
= 0
1106 and then Is_Access_Type
(R_Type
)
1107 and then not Nkind_In
(Expr
, N_Null
, N_Raise_Expression
)
1108 and then Is_Interface
(Designated_Type
(R_Type
))
1109 and then Is_Progenitor
(Designated_Type
(R_Type
),
1110 Designated_Type
(Etype
(Expr
)))
1112 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1116 Resolve
(Expr
, R_Type
);
1117 Check_Limited_Return
(N
, Expr
, R_Type
);
1119 if Present
(Expr
) and then Nkind
(Expr
) = N_Aggregate
then
1120 Check_Aggregate_Accessibility
(Expr
);
1124 -- RETURN only allowed in SPARK as the last statement in function
1126 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1128 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
1129 or else Present
(Next
(N
)))
1131 Check_SPARK_05_Restriction
1132 ("RETURN should be the last statement in function", N
);
1136 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
1137 Obj_Decl
:= Last
(Return_Object_Declarations
(N
));
1139 -- Analyze parts specific to extended_return_statement:
1142 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
1143 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
1146 Expr
:= Expression
(Obj_Decl
);
1148 -- Note: The check for OK_For_Limited_Init will happen in
1149 -- Analyze_Object_Declaration; we treat it as a normal
1150 -- object declaration.
1152 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
1155 Check_Return_Subtype_Indication
(Obj_Decl
);
1157 if Present
(HSS
) then
1160 if Present
(Exception_Handlers
(HSS
)) then
1162 -- ???Has_Nested_Block_With_Handler needs to be set.
1163 -- Probably by creating an actual N_Block_Statement.
1164 -- Probably in Expand.
1170 -- Mark the return object as referenced, since the return is an
1171 -- implicit reference of the object.
1173 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
1175 Check_References
(Stm_Entity
);
1177 -- Check RM 6.5 (5.9/3)
1180 if Ada_Version
< Ada_2012
then
1182 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
1183 -- Can it really happen (extended return???)
1186 ("aliased only allowed for limited return objects "
1187 & "in Ada 2012??", N
);
1189 elsif not Is_Limited_View
(R_Type
) then
1191 ("aliased only allowed for limited return objects", N
);
1197 -- Case of Expr present
1201 -- Defend against previous errors
1203 and then Nkind
(Expr
) /= N_Empty
1204 and then Present
(Etype
(Expr
))
1206 -- Apply constraint check. Note that this is done before the implicit
1207 -- conversion of the expression done for anonymous access types to
1208 -- ensure correct generation of the null-excluding check associated
1209 -- with null-excluding expressions found in return statements.
1211 Apply_Constraint_Check
(Expr
, R_Type
);
1213 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1214 -- type, apply an implicit conversion of the expression to that type
1215 -- to force appropriate static and run-time accessibility checks.
1217 if Ada_Version
>= Ada_2005
1218 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1220 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1221 Analyze_And_Resolve
(Expr
, R_Type
);
1223 -- If this is a local anonymous access to subprogram, the
1224 -- accessibility check can be applied statically. The return is
1225 -- illegal if the access type of the return expression is declared
1226 -- inside of the subprogram (except if it is the subtype indication
1227 -- of an extended return statement).
1229 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1230 if not Comes_From_Source
(Current_Scope
)
1231 or else Ekind
(Current_Scope
) = E_Return_Statement
1236 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1238 Error_Msg_N
("cannot return local access to subprogram", N
);
1241 -- The expression cannot be of a formal incomplete type
1243 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1244 and then Is_Generic_Type
(Etype
(Expr
))
1247 ("cannot return expression of a formal incomplete type", N
);
1250 -- If the result type is class-wide, then check that the return
1251 -- expression's type is not declared at a deeper level than the
1252 -- function (RM05-6.5(5.6/2)).
1254 if Ada_Version
>= Ada_2005
1255 and then Is_Class_Wide_Type
(R_Type
)
1257 if Type_Access_Level
(Etype
(Expr
)) >
1258 Subprogram_Access_Level
(Scope_Id
)
1261 ("level of return expression type is deeper than "
1262 & "class-wide function!", Expr
);
1266 -- Check incorrect use of dynamically tagged expression
1268 if Is_Tagged_Type
(R_Type
) then
1269 Check_Dynamically_Tagged_Expression
1275 -- ??? A real run-time accessibility check is needed in cases
1276 -- involving dereferences of access parameters. For now we just
1277 -- check the static cases.
1279 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1280 and then Is_Limited_View
(Etype
(Scope_Id
))
1281 and then Object_Access_Level
(Expr
) >
1282 Subprogram_Access_Level
(Scope_Id
)
1284 -- Suppress the message in a generic, where the rewriting
1287 if Inside_A_Generic
then
1292 Make_Raise_Program_Error
(Loc
,
1293 Reason
=> PE_Accessibility_Check_Failed
));
1296 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1297 Error_Msg_N
("cannot return a local value by reference<<", N
);
1298 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1302 if Known_Null
(Expr
)
1303 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1304 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1306 Apply_Compile_Time_Constraint_Error
1308 Msg
=> "(Ada 2005) null not allowed for "
1309 & "null-excluding return??",
1310 Reason
=> CE_Null_Not_Allowed
);
1313 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1314 -- has no initializing expression.
1316 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1317 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1318 Subprogram_Access_Level
(Scope_Id
)
1321 ("level of return expression type is deeper than "
1322 & "class-wide function!", Obj_Decl
);
1325 end Analyze_Function_Return
;
1327 -------------------------------------
1328 -- Analyze_Generic_Subprogram_Body --
1329 -------------------------------------
1331 procedure Analyze_Generic_Subprogram_Body
1335 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1336 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1337 Body_Id
: Entity_Id
;
1342 -- Copy body and disable expansion while analyzing the generic For a
1343 -- stub, do not copy the stub (which would load the proper body), this
1344 -- will be done when the proper body is analyzed.
1346 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1347 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1350 -- Once the contents of the generic copy and the template are
1351 -- swapped, do the same for their respective aspect specifications.
1353 Exchange_Aspects
(N
, New_N
);
1355 -- Collect all contract-related source pragmas found within the
1356 -- template and attach them to the contract of the subprogram body.
1357 -- This contract is used in the capture of global references within
1360 Create_Generic_Contract
(N
);
1365 Spec
:= Specification
(N
);
1367 -- Within the body of the generic, the subprogram is callable, and
1368 -- behaves like the corresponding non-generic unit.
1370 Body_Id
:= Defining_Entity
(Spec
);
1372 if Kind
= E_Generic_Procedure
1373 and then Nkind
(Spec
) /= N_Procedure_Specification
1375 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1378 elsif Kind
= E_Generic_Function
1379 and then Nkind
(Spec
) /= N_Function_Specification
1381 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1385 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1387 if Has_Completion
(Gen_Id
)
1388 and then Nkind
(Parent
(N
)) /= N_Subunit
1390 Error_Msg_N
("duplicate generic body", N
);
1393 Set_Has_Completion
(Gen_Id
);
1396 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1397 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1399 Set_Corresponding_Spec
(N
, Gen_Id
);
1402 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1403 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1406 -- Make generic parameters immediately visible in the body. They are
1407 -- needed to process the formals declarations. Then make the formals
1408 -- visible in a separate step.
1410 Push_Scope
(Gen_Id
);
1414 First_Ent
: Entity_Id
;
1417 First_Ent
:= First_Entity
(Gen_Id
);
1420 while Present
(E
) and then not Is_Formal
(E
) loop
1425 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1427 -- Now generic formals are visible, and the specification can be
1428 -- analyzed, for subsequent conformance check.
1430 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1432 -- Make formal parameters visible
1436 -- E is the first formal parameter, we loop through the formals
1437 -- installing them so that they will be visible.
1439 Set_First_Entity
(Gen_Id
, E
);
1440 while Present
(E
) loop
1446 -- Visible generic entity is callable within its own body
1448 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1449 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1450 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1451 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1452 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1454 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1456 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1458 -- No body to analyze, so restore state of generic unit
1460 Set_Ekind
(Gen_Id
, Kind
);
1461 Set_Ekind
(Body_Id
, Kind
);
1463 if Present
(First_Ent
) then
1464 Set_First_Entity
(Gen_Id
, First_Ent
);
1471 -- If this is a compilation unit, it must be made visible explicitly,
1472 -- because the compilation of the declaration, unlike other library
1473 -- unit declarations, does not. If it is not a unit, the following
1474 -- is redundant but harmless.
1476 Set_Is_Immediately_Visible
(Gen_Id
);
1477 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1479 if Is_Child_Unit
(Gen_Id
) then
1480 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1483 Set_Actual_Subtypes
(N
, Current_Scope
);
1485 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1486 Set_SPARK_Pragma_Inherited
(Body_Id
);
1488 -- Analyze any aspect specifications that appear on the generic
1491 if Has_Aspects
(N
) then
1492 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
1495 Analyze_Declarations
(Declarations
(N
));
1498 -- Process the contract of the subprogram body after all declarations
1499 -- have been analyzed. This ensures that any contract-related pragmas
1500 -- are available through the N_Contract node of the body.
1502 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
1504 Analyze
(Handled_Statement_Sequence
(N
));
1505 Save_Global_References
(Original_Node
(N
));
1507 -- Prior to exiting the scope, include generic formals again (if any
1508 -- are present) in the set of local entities.
1510 if Present
(First_Ent
) then
1511 Set_First_Entity
(Gen_Id
, First_Ent
);
1514 Check_References
(Gen_Id
);
1517 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1518 Update_Use_Clause_Chain
;
1520 Check_Subprogram_Order
(N
);
1522 -- Outside of its body, unit is generic again
1524 Set_Ekind
(Gen_Id
, Kind
);
1525 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1528 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1532 end Analyze_Generic_Subprogram_Body
;
1534 ----------------------------
1535 -- Analyze_Null_Procedure --
1536 ----------------------------
1538 procedure Analyze_Null_Procedure
1540 Is_Completion
: out Boolean)
1542 Loc
: constant Source_Ptr
:= Sloc
(N
);
1543 Spec
: constant Node_Id
:= Specification
(N
);
1544 Designator
: Entity_Id
;
1546 Null_Body
: Node_Id
:= Empty
;
1547 Null_Stmt
: Node_Id
:= Null_Statement
(Spec
);
1551 -- Capture the profile of the null procedure before analysis, for
1552 -- expansion at the freeze point and at each point of call. The body is
1553 -- used if the procedure has preconditions, or if it is a completion. In
1554 -- the first case the body is analyzed at the freeze point, in the other
1555 -- it replaces the null procedure declaration.
1557 -- For a null procedure that comes from source, a NULL statement is
1558 -- provided by the parser, which carries the source location of the
1559 -- NULL keyword, and has Comes_From_Source set. For a null procedure
1560 -- from expansion, create one now.
1562 if No
(Null_Stmt
) then
1563 Null_Stmt
:= Make_Null_Statement
(Loc
);
1567 Make_Subprogram_Body
(Loc
,
1568 Specification
=> New_Copy_Tree
(Spec
),
1569 Declarations
=> New_List
,
1570 Handled_Statement_Sequence
=>
1571 Make_Handled_Sequence_Of_Statements
(Loc
,
1572 Statements
=> New_List
(Null_Stmt
)));
1574 -- Create new entities for body and formals
1576 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1577 Make_Defining_Identifier
1578 (Sloc
(Defining_Entity
(N
)),
1579 Chars
(Defining_Entity
(N
))));
1581 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1582 while Present
(Form
) loop
1583 Set_Defining_Identifier
(Form
,
1584 Make_Defining_Identifier
1585 (Sloc
(Defining_Identifier
(Form
)),
1586 Chars
(Defining_Identifier
(Form
))));
1590 -- Determine whether the null procedure may be a completion of a generic
1591 -- suprogram, in which case we use the new null body as the completion
1592 -- and set minimal semantic information on the original declaration,
1593 -- which is rewritten as a null statement.
1595 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1597 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1598 Insert_Before
(N
, Null_Body
);
1599 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1601 Rewrite
(N
, Make_Null_Statement
(Loc
));
1602 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1603 Is_Completion
:= True;
1607 -- Resolve the types of the formals now, because the freeze point may
1608 -- appear in a different context, e.g. an instantiation.
1610 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1611 while Present
(Form
) loop
1612 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1613 Find_Type
(Parameter_Type
(Form
));
1615 elsif No
(Access_To_Subprogram_Definition
1616 (Parameter_Type
(Form
)))
1618 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1620 -- The case of a null procedure with a formal that is an
1621 -- access-to-subprogram type, and that is used as an actual
1622 -- in an instantiation is left to the enthusiastic reader.
1632 -- If there are previous overloadable entities with the same name, check
1633 -- whether any of them is completed by the null procedure.
1635 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1636 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1637 Prev
:= Find_Corresponding_Spec
(N
);
1640 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1641 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1642 Set_Has_Completion
(Designator
);
1644 -- Signal to caller that this is a procedure declaration
1646 Is_Completion
:= False;
1648 -- Null procedures are always inlined, but generic formal subprograms
1649 -- which appear as such in the internal instance of formal packages,
1650 -- need no completion and are not marked Inline.
1653 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1655 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1656 Set_Body_To_Inline
(N
, Null_Body
);
1657 Set_Is_Inlined
(Designator
);
1661 -- The null procedure is a completion. We unconditionally rewrite
1662 -- this as a null body (even if expansion is not active), because
1663 -- there are various error checks that are applied on this body
1664 -- when it is analyzed (e.g. correct aspect placement).
1666 if Has_Completion
(Prev
) then
1667 Error_Msg_Sloc
:= Sloc
(Prev
);
1668 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1671 Check_Previous_Null_Procedure
(N
, Prev
);
1673 Is_Completion
:= True;
1674 Rewrite
(N
, Null_Body
);
1677 end Analyze_Null_Procedure
;
1679 -----------------------------
1680 -- Analyze_Operator_Symbol --
1681 -----------------------------
1683 -- An operator symbol such as "+" or "and" may appear in context where the
1684 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1685 -- is just a string, as in (conjunction = "or"). In these cases the parser
1686 -- generates this node, and the semantics does the disambiguation. Other
1687 -- such case are actuals in an instantiation, the generic unit in an
1688 -- instantiation, and pragma arguments.
1690 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1691 Par
: constant Node_Id
:= Parent
(N
);
1694 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1695 or else Nkind
(Par
) = N_Function_Instantiation
1696 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1697 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1698 and then not Is_Pragma_String_Literal
(Par
))
1699 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1700 or else (Nkind
(Par
) = N_Attribute_Reference
1701 and then Attribute_Name
(Par
) /= Name_Value
)
1703 Find_Direct_Name
(N
);
1706 Change_Operator_Symbol_To_String_Literal
(N
);
1709 end Analyze_Operator_Symbol
;
1711 -----------------------------------
1712 -- Analyze_Parameter_Association --
1713 -----------------------------------
1715 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1717 Analyze
(Explicit_Actual_Parameter
(N
));
1718 end Analyze_Parameter_Association
;
1720 ----------------------------
1721 -- Analyze_Procedure_Call --
1722 ----------------------------
1724 -- WARNING: This routine manages Ghost regions. Return statements must be
1725 -- replaced by gotos which jump to the end of the routine and restore the
1728 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1729 procedure Analyze_Call_And_Resolve
;
1730 -- Do Analyze and Resolve calls for procedure call. At the end, check
1731 -- for illegal order dependence.
1732 -- ??? where is the check for illegal order dependencies?
1734 ------------------------------
1735 -- Analyze_Call_And_Resolve --
1736 ------------------------------
1738 procedure Analyze_Call_And_Resolve
is
1740 if Nkind
(N
) = N_Procedure_Call_Statement
then
1742 Resolve
(N
, Standard_Void_Type
);
1746 end Analyze_Call_And_Resolve
;
1750 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1751 Loc
: constant Source_Ptr
:= Sloc
(N
);
1752 P
: constant Node_Id
:= Name
(N
);
1754 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1755 -- Save the Ghost mode to restore on exit
1760 -- Start of processing for Analyze_Procedure_Call
1763 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1764 -- a procedure call or an entry call. The prefix may denote an access
1765 -- to subprogram type, in which case an implicit dereference applies.
1766 -- If the prefix is an indexed component (without implicit dereference)
1767 -- then the construct denotes a call to a member of an entire family.
1768 -- If the prefix is a simple name, it may still denote a call to a
1769 -- parameterless member of an entry family. Resolution of these various
1770 -- interpretations is delicate.
1772 -- Do not analyze machine code statements to avoid rejecting them in
1775 if CodePeer_Mode
and then Nkind
(P
) = N_Qualified_Expression
then
1776 Set_Etype
(P
, Standard_Void_Type
);
1781 -- If this is a call of the form Obj.Op, the call may have been analyzed
1782 -- and possibly rewritten into a block, in which case we are done.
1784 if Analyzed
(N
) then
1787 -- If there is an error analyzing the name (which may have been
1788 -- rewritten if the original call was in prefix notation) then error
1789 -- has been emitted already, mark node and return.
1791 elsif Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1792 Set_Etype
(N
, Any_Type
);
1796 -- A procedure call is Ghost when its name denotes a Ghost procedure.
1797 -- Set the mode now to ensure that any nodes generated during analysis
1798 -- and expansion are properly marked as Ghost.
1800 Mark_And_Set_Ghost_Procedure_Call
(N
);
1802 -- Otherwise analyze the parameters
1804 if Present
(Actuals
) then
1805 Actual
:= First
(Actuals
);
1807 while Present
(Actual
) loop
1809 Check_Parameterless_Call
(Actual
);
1814 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1816 if Nkind
(P
) = N_Attribute_Reference
1817 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1819 Name_Elab_Subp_Body
)
1821 if Present
(Actuals
) then
1823 ("no parameters allowed for this call", First
(Actuals
));
1827 Set_Etype
(N
, Standard_Void_Type
);
1830 elsif Is_Entity_Name
(P
)
1831 and then Is_Record_Type
(Etype
(Entity
(P
)))
1832 and then Remote_AST_I_Dereference
(P
)
1836 elsif Is_Entity_Name
(P
)
1837 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1839 if Is_Access_Type
(Etype
(P
))
1840 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1841 and then No
(Actuals
)
1842 and then Comes_From_Source
(N
)
1844 Error_Msg_N
("missing explicit dereference in call", N
);
1847 Analyze_Call_And_Resolve
;
1849 -- If the prefix is the simple name of an entry family, this is a
1850 -- parameterless call from within the task body itself.
1852 elsif Is_Entity_Name
(P
)
1853 and then Nkind
(P
) = N_Identifier
1854 and then Ekind
(Entity
(P
)) = E_Entry_Family
1855 and then Present
(Actuals
)
1856 and then No
(Next
(First
(Actuals
)))
1858 -- Can be call to parameterless entry family. What appears to be the
1859 -- sole argument is in fact the entry index. Rewrite prefix of node
1860 -- accordingly. Source representation is unchanged by this
1864 Make_Indexed_Component
(Loc
,
1866 Make_Selected_Component
(Loc
,
1867 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1868 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1869 Expressions
=> Actuals
);
1870 Set_Name
(N
, New_N
);
1871 Set_Etype
(New_N
, Standard_Void_Type
);
1872 Set_Parameter_Associations
(N
, No_List
);
1873 Analyze_Call_And_Resolve
;
1875 elsif Nkind
(P
) = N_Explicit_Dereference
then
1876 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1877 Analyze_Call_And_Resolve
;
1879 Error_Msg_N
("expect access to procedure in call", P
);
1882 -- The name can be a selected component or an indexed component that
1883 -- yields an access to subprogram. Such a prefix is legal if the call
1884 -- has parameter associations.
1886 elsif Is_Access_Type
(Etype
(P
))
1887 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1889 if Present
(Actuals
) then
1890 Analyze_Call_And_Resolve
;
1892 Error_Msg_N
("missing explicit dereference in call ", N
);
1895 -- If not an access to subprogram, then the prefix must resolve to the
1896 -- name of an entry, entry family, or protected operation.
1898 -- For the case of a simple entry call, P is a selected component where
1899 -- the prefix is the task and the selector name is the entry. A call to
1900 -- a protected procedure will have the same syntax. If the protected
1901 -- object contains overloaded operations, the entity may appear as a
1902 -- function, the context will select the operation whose type is Void.
1904 elsif Nkind
(P
) = N_Selected_Component
1905 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1909 -- When front-end inlining is enabled, as with SPARK_Mode, a call
1910 -- in prefix notation may still be missing its controlling argument,
1911 -- so perform the transformation now.
1913 if SPARK_Mode
= On
and then In_Inlined_Body
then
1915 Subp
: constant Entity_Id
:= Entity
(Selector_Name
(P
));
1916 Typ
: constant Entity_Id
:= Etype
(Prefix
(P
));
1919 if Is_Tagged_Type
(Typ
)
1920 and then Present
(First_Formal
(Subp
))
1921 and then Etype
(First_Formal
(Subp
)) = Typ
1922 and then Try_Object_Operation
(P
)
1927 Analyze_Call_And_Resolve
;
1932 Analyze_Call_And_Resolve
;
1935 elsif Nkind
(P
) = N_Selected_Component
1936 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1937 and then Present
(Actuals
)
1938 and then No
(Next
(First
(Actuals
)))
1940 -- Can be call to parameterless entry family. What appears to be the
1941 -- sole argument is in fact the entry index. Rewrite prefix of node
1942 -- accordingly. Source representation is unchanged by this
1946 Make_Indexed_Component
(Loc
,
1947 Prefix
=> New_Copy
(P
),
1948 Expressions
=> Actuals
);
1949 Set_Name
(N
, New_N
);
1950 Set_Etype
(New_N
, Standard_Void_Type
);
1951 Set_Parameter_Associations
(N
, No_List
);
1952 Analyze_Call_And_Resolve
;
1954 -- For the case of a reference to an element of an entry family, P is
1955 -- an indexed component whose prefix is a selected component (task and
1956 -- entry family), and whose index is the entry family index.
1958 elsif Nkind
(P
) = N_Indexed_Component
1959 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1960 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1962 Analyze_Call_And_Resolve
;
1964 -- If the prefix is the name of an entry family, it is a call from
1965 -- within the task body itself.
1967 elsif Nkind
(P
) = N_Indexed_Component
1968 and then Nkind
(Prefix
(P
)) = N_Identifier
1969 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1972 Make_Selected_Component
(Loc
,
1974 New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1975 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1976 Rewrite
(Prefix
(P
), New_N
);
1978 Analyze_Call_And_Resolve
;
1980 -- In Ada 2012. a qualified expression is a name, but it cannot be a
1981 -- procedure name, so the construct can only be a qualified expression.
1983 elsif Nkind
(P
) = N_Qualified_Expression
1984 and then Ada_Version
>= Ada_2012
1986 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
1989 -- Anything else is an error
1992 Error_Msg_N
("invalid procedure or entry call", N
);
1996 Restore_Ghost_Mode
(Saved_GM
);
1997 end Analyze_Procedure_Call
;
1999 ------------------------------
2000 -- Analyze_Return_Statement --
2001 ------------------------------
2003 procedure Analyze_Return_Statement
(N
: Node_Id
) is
2004 pragma Assert
(Nkind_In
(N
, N_Extended_Return_Statement
,
2005 N_Simple_Return_Statement
));
2007 Returns_Object
: constant Boolean :=
2008 Nkind
(N
) = N_Extended_Return_Statement
2010 (Nkind
(N
) = N_Simple_Return_Statement
2011 and then Present
(Expression
(N
)));
2012 -- True if we're returning something; that is, "return <expression>;"
2013 -- or "return Result : T [:= ...]". False for "return;". Used for error
2014 -- checking: If Returns_Object is True, N should apply to a function
2015 -- body; otherwise N should apply to a procedure body, entry body,
2016 -- accept statement, or extended return statement.
2018 function Find_What_It_Applies_To
return Entity_Id
;
2019 -- Find the entity representing the innermost enclosing body, accept
2020 -- statement, or extended return statement. If the result is a callable
2021 -- construct or extended return statement, then this will be the value
2022 -- of the Return_Applies_To attribute. Otherwise, the program is
2023 -- illegal. See RM-6.5(4/2).
2025 -----------------------------
2026 -- Find_What_It_Applies_To --
2027 -----------------------------
2029 function Find_What_It_Applies_To
return Entity_Id
is
2030 Result
: Entity_Id
:= Empty
;
2033 -- Loop outward through the Scope_Stack, skipping blocks, loops,
2034 -- and postconditions.
2036 for J
in reverse 0 .. Scope_Stack
.Last
loop
2037 Result
:= Scope_Stack
.Table
(J
).Entity
;
2038 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
2039 and then Chars
(Result
) /= Name_uPostconditions
;
2042 pragma Assert
(Present
(Result
));
2044 end Find_What_It_Applies_To
;
2046 -- Local declarations
2048 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
2049 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
2050 Loc
: constant Source_Ptr
:= Sloc
(N
);
2051 Stm_Entity
: constant Entity_Id
:=
2053 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
2055 -- Start of processing for Analyze_Return_Statement
2058 Set_Return_Statement_Entity
(N
, Stm_Entity
);
2060 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
2061 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
2063 -- Place Return entity on scope stack, to simplify enforcement of 6.5
2064 -- (4/2): an inner return statement will apply to this extended return.
2066 if Nkind
(N
) = N_Extended_Return_Statement
then
2067 Push_Scope
(Stm_Entity
);
2070 -- Check that pragma No_Return is obeyed. Don't complain about the
2071 -- implicitly-generated return that is placed at the end.
2073 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
2074 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
2077 -- Warn on any unassigned OUT parameters if in procedure
2079 if Ekind
(Scope_Id
) = E_Procedure
then
2080 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
2083 -- Check that functions return objects, and other things do not
2085 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
2086 if not Returns_Object
then
2087 Error_Msg_N
("missing expression in return from function", N
);
2090 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
2091 if Returns_Object
then
2092 Error_Msg_N
("procedure cannot return value (use function)", N
);
2095 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
2096 if Returns_Object
then
2097 if Is_Protected_Type
(Scope
(Scope_Id
)) then
2098 Error_Msg_N
("entry body cannot return value", N
);
2100 Error_Msg_N
("accept statement cannot return value", N
);
2104 elsif Kind
= E_Return_Statement
then
2106 -- We are nested within another return statement, which must be an
2107 -- extended_return_statement.
2109 if Returns_Object
then
2110 if Nkind
(N
) = N_Extended_Return_Statement
then
2112 ("extended return statement cannot be nested (use `RETURN;`)",
2115 -- Case of a simple return statement with a value inside extended
2116 -- return statement.
2120 ("return nested in extended return statement cannot return "
2121 & "value (use `RETURN;`)", N
);
2126 Error_Msg_N
("illegal context for return statement", N
);
2129 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
2130 Analyze_Function_Return
(N
);
2132 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
2133 Set_Return_Present
(Scope_Id
);
2136 if Nkind
(N
) = N_Extended_Return_Statement
then
2140 Kill_Current_Values
(Last_Assignment_Only
=> True);
2141 Check_Unreachable_Code
(N
);
2143 Analyze_Dimension
(N
);
2144 end Analyze_Return_Statement
;
2146 -------------------------------------
2147 -- Analyze_Simple_Return_Statement --
2148 -------------------------------------
2150 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
2152 if Present
(Expression
(N
)) then
2153 Mark_Coextensions
(N
, Expression
(N
));
2156 Analyze_Return_Statement
(N
);
2157 end Analyze_Simple_Return_Statement
;
2159 -------------------------
2160 -- Analyze_Return_Type --
2161 -------------------------
2163 procedure Analyze_Return_Type
(N
: Node_Id
) is
2164 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2165 Typ
: Entity_Id
:= Empty
;
2168 -- Normal case where result definition does not indicate an error
2170 if Result_Definition
(N
) /= Error
then
2171 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
2172 Check_SPARK_05_Restriction
2173 ("access result is not allowed", Result_Definition
(N
));
2175 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
2178 AD
: constant Node_Id
:=
2179 Access_To_Subprogram_Definition
(Result_Definition
(N
));
2181 if Present
(AD
) and then Protected_Present
(AD
) then
2182 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
2184 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
2188 Set_Parent
(Typ
, Result_Definition
(N
));
2189 Set_Is_Local_Anonymous_Access
(Typ
);
2190 Set_Etype
(Designator
, Typ
);
2192 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2194 Null_Exclusion_Static_Checks
(N
);
2196 -- Subtype_Mark case
2199 Find_Type
(Result_Definition
(N
));
2200 Typ
:= Entity
(Result_Definition
(N
));
2201 Set_Etype
(Designator
, Typ
);
2203 -- Unconstrained array as result is not allowed in SPARK
2205 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
2206 Check_SPARK_05_Restriction
2207 ("returning an unconstrained array is not allowed",
2208 Result_Definition
(N
));
2211 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2213 Null_Exclusion_Static_Checks
(N
);
2215 -- If a null exclusion is imposed on the result type, then create
2216 -- a null-excluding itype (an access subtype) and use it as the
2217 -- function's Etype. Note that the null exclusion checks are done
2218 -- right before this, because they don't get applied to types that
2219 -- do not come from source.
2221 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2222 Set_Etype
(Designator
,
2223 Create_Null_Excluding_Itype
2226 Scope_Id
=> Scope
(Current_Scope
)));
2228 -- The new subtype must be elaborated before use because
2229 -- it is visible outside of the function. However its base
2230 -- type may not be frozen yet, so the reference that will
2231 -- force elaboration must be attached to the freezing of
2234 -- If the return specification appears on a proper body,
2235 -- the subtype will have been created already on the spec.
2237 if Is_Frozen
(Typ
) then
2238 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2239 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2243 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2247 Ensure_Freeze_Node
(Typ
);
2250 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2252 Set_Itype
(IR
, Etype
(Designator
));
2253 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2258 Set_Etype
(Designator
, Typ
);
2261 if Ekind
(Typ
) = E_Incomplete_Type
2262 or else (Is_Class_Wide_Type
(Typ
)
2263 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2265 -- AI05-0151: Tagged incomplete types are allowed in all formal
2266 -- parts. Untagged incomplete types are not allowed in bodies.
2267 -- As a consequence, limited views cannot appear in a basic
2268 -- declaration that is itself within a body, because there is
2269 -- no point at which the non-limited view will become visible.
2271 if Ada_Version
>= Ada_2012
then
2272 if From_Limited_With
(Typ
) and then In_Package_Body
then
2274 ("invalid use of incomplete type&",
2275 Result_Definition
(N
), Typ
);
2277 -- The return type of a subprogram body cannot be of a
2278 -- formal incomplete type.
2280 elsif Is_Generic_Type
(Typ
)
2281 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2284 ("return type cannot be a formal incomplete type",
2285 Result_Definition
(N
));
2287 elsif Is_Class_Wide_Type
(Typ
)
2288 and then Is_Generic_Type
(Root_Type
(Typ
))
2289 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2292 ("return type cannot be a formal incomplete type",
2293 Result_Definition
(N
));
2295 elsif Is_Tagged_Type
(Typ
) then
2298 -- Use is legal in a thunk generated for an operation
2299 -- inherited from a progenitor.
2301 elsif Is_Thunk
(Designator
)
2302 and then Present
(Non_Limited_View
(Typ
))
2306 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2307 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2311 ("invalid use of untagged incomplete type&",
2315 -- The type must be completed in the current package. This
2316 -- is checked at the end of the package declaration when
2317 -- Taft-amendment types are identified. If the return type
2318 -- is class-wide, there is no required check, the type can
2319 -- be a bona fide TAT.
2321 if Ekind
(Scope
(Current_Scope
)) = E_Package
2322 and then In_Private_Part
(Scope
(Current_Scope
))
2323 and then not Is_Class_Wide_Type
(Typ
)
2325 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2330 ("invalid use of incomplete type&", Designator
, Typ
);
2335 -- Case where result definition does indicate an error
2338 Set_Etype
(Designator
, Any_Type
);
2340 end Analyze_Return_Type
;
2342 -----------------------------
2343 -- Analyze_Subprogram_Body --
2344 -----------------------------
2346 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2347 Loc
: constant Source_Ptr
:= Sloc
(N
);
2348 Body_Spec
: constant Node_Id
:= Specification
(N
);
2349 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2352 if Debug_Flag_C
then
2353 Write_Str
("==> subprogram body ");
2354 Write_Name
(Chars
(Body_Id
));
2355 Write_Str
(" from ");
2356 Write_Location
(Loc
);
2361 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2363 -- The real work is split out into the helper, so it can do "return;"
2364 -- without skipping the debug output:
2366 Analyze_Subprogram_Body_Helper
(N
);
2368 if Debug_Flag_C
then
2370 Write_Str
("<== subprogram body ");
2371 Write_Name
(Chars
(Body_Id
));
2372 Write_Str
(" from ");
2373 Write_Location
(Loc
);
2376 end Analyze_Subprogram_Body
;
2378 ------------------------------------
2379 -- Analyze_Subprogram_Body_Helper --
2380 ------------------------------------
2382 -- This procedure is called for regular subprogram bodies, generic bodies,
2383 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2384 -- specification matters, and is used to create a proper declaration for
2385 -- the subprogram, or to perform conformance checks.
2387 -- WARNING: This routine manages Ghost regions. Return statements must be
2388 -- replaced by gotos which jump to the end of the routine and restore the
2391 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2392 Body_Spec
: Node_Id
:= Specification
(N
);
2393 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2394 Loc
: constant Source_Ptr
:= Sloc
(N
);
2395 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2397 Conformant
: Boolean;
2398 Desig_View
: Entity_Id
:= Empty
;
2399 Exch_Views
: Elist_Id
:= No_Elist
;
2401 Mask_Types
: Elist_Id
:= No_Elist
;
2402 Prot_Typ
: Entity_Id
:= Empty
;
2403 Spec_Decl
: Node_Id
:= Empty
;
2404 Spec_Id
: Entity_Id
;
2406 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2407 -- When we analyze a separate spec, the entity chain ends up containing
2408 -- the formals, as well as any itypes generated during analysis of the
2409 -- default expressions for parameters, or the arguments of associated
2410 -- precondition/postcondition pragmas (which are analyzed in the context
2411 -- of the spec since they have visibility on formals).
2413 -- These entities belong with the spec and not the body. However we do
2414 -- the analysis of the body in the context of the spec (again to obtain
2415 -- visibility to the formals), and all the entities generated during
2416 -- this analysis end up also chained to the entity chain of the spec.
2417 -- But they really belong to the body, and there is circuitry to move
2418 -- them from the spec to the body.
2420 -- However, when we do this move, we don't want to move the real spec
2421 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2422 -- variable points to the last real spec entity, so we only move those
2423 -- chained beyond that point. It is initialized to Empty to deal with
2424 -- the case where there is no separate spec.
2426 function Body_Has_Contract
return Boolean;
2427 -- Check whether unanalyzed body has an aspect or pragma that may
2428 -- generate a SPARK contract.
2430 function Body_Has_SPARK_Mode_On
return Boolean;
2431 -- Check whether SPARK_Mode On applies to the subprogram body, either
2432 -- because it is specified directly on the body, or because it is
2433 -- inherited from the enclosing subprogram or package.
2435 procedure Build_Subprogram_Declaration
;
2436 -- Create a matching subprogram declaration for subprogram body N
2438 procedure Check_Anonymous_Return
;
2439 -- Ada 2005: if a function returns an access type that denotes a task,
2440 -- or a type that contains tasks, we must create a master entity for
2441 -- the anonymous type, which typically will be used in an allocator
2442 -- in the body of the function.
2444 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2445 -- Look ahead to recognize a pragma that may appear after the body.
2446 -- If there is a previous spec, check that it appears in the same
2447 -- declarative part. If the pragma is Inline_Always, perform inlining
2448 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2449 -- If the body acts as a spec, and inlining is required, we create a
2450 -- subprogram declaration for it, in order to attach the body to inline.
2451 -- If pragma does not appear after the body, check whether there is
2452 -- an inline pragma before any local declarations.
2454 procedure Check_Missing_Return
;
2455 -- Checks for a function with a no return statements, and also performs
2456 -- the warning checks implemented by Check_Returns. In formal mode, also
2457 -- verify that a function ends with a RETURN and that a procedure does
2458 -- not contain any RETURN.
2460 function Disambiguate_Spec
return Entity_Id
;
2461 -- When a primitive is declared between the private view and the full
2462 -- view of a concurrent type which implements an interface, a special
2463 -- mechanism is used to find the corresponding spec of the primitive
2466 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
;
2467 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2468 -- incomplete types coming from a limited context and replace their
2469 -- limited views with the non-limited ones. Return the list of changes
2470 -- to be used to undo the transformation.
2472 function Is_Private_Concurrent_Primitive
2473 (Subp_Id
: Entity_Id
) return Boolean;
2474 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2475 -- type that implements an interface and has a private view.
2477 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
;
2478 -- N is the body generated for an expression function that is not a
2479 -- completion and Spec_Id the defining entity of its spec. Mark all
2480 -- the not-yet-frozen types referenced by the simple return statement
2481 -- of the function as formally frozen.
2483 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
);
2484 -- Undo the transformation done by Exchange_Limited_Views.
2486 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2487 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2488 -- subprogram whose body is being analyzed. N is the statement node
2489 -- causing the flag to be set, if the following statement is a return
2490 -- of an entity, we mark the entity as set in source to suppress any
2491 -- warning on the stylized use of function stubs with a dummy return.
2493 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
);
2494 -- Undo the transformation done by Mask_Unfrozen_Types
2496 procedure Verify_Overriding_Indicator
;
2497 -- If there was a previous spec, the entity has been entered in the
2498 -- current scope previously. If the body itself carries an overriding
2499 -- indicator, check that it is consistent with the known status of the
2502 -----------------------
2503 -- Body_Has_Contract --
2504 -----------------------
2506 function Body_Has_Contract
return Boolean is
2507 Decls
: constant List_Id
:= Declarations
(N
);
2511 -- Check for aspects that may generate a contract
2513 if Present
(Aspect_Specifications
(N
)) then
2514 Item
:= First
(Aspect_Specifications
(N
));
2515 while Present
(Item
) loop
2516 if Is_Subprogram_Contract_Annotation
(Item
) then
2524 -- Check for pragmas that may generate a contract
2526 if Present
(Decls
) then
2527 Item
:= First
(Decls
);
2528 while Present
(Item
) loop
2529 if Nkind
(Item
) = N_Pragma
2530 and then Is_Subprogram_Contract_Annotation
(Item
)
2540 end Body_Has_Contract
;
2542 ----------------------------
2543 -- Body_Has_SPARK_Mode_On --
2544 ----------------------------
2546 function Body_Has_SPARK_Mode_On
return Boolean is
2547 Decls
: constant List_Id
:= Declarations
(N
);
2551 -- Check for SPARK_Mode aspect
2553 if Present
(Aspect_Specifications
(N
)) then
2554 Item
:= First
(Aspect_Specifications
(N
));
2555 while Present
(Item
) loop
2556 if Get_Aspect_Id
(Item
) = Aspect_SPARK_Mode
then
2557 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2564 -- Check for SPARK_Mode pragma
2566 if Present
(Decls
) then
2567 Item
:= First
(Decls
);
2568 while Present
(Item
) loop
2570 -- Pragmas that apply to a subprogram body are usually grouped
2571 -- together. Look for a potential pragma SPARK_Mode among them.
2573 if Nkind
(Item
) = N_Pragma
then
2574 if Get_Pragma_Id
(Item
) = Pragma_SPARK_Mode
then
2575 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2578 -- Otherwise the first non-pragma declarative item terminates
2579 -- the region where pragma SPARK_Mode may appear.
2589 -- Otherwise, the applicable SPARK_Mode is inherited from the
2590 -- enclosing subprogram or package.
2592 return SPARK_Mode
= On
;
2593 end Body_Has_SPARK_Mode_On
;
2595 ----------------------------------
2596 -- Build_Subprogram_Declaration --
2597 ----------------------------------
2599 procedure Build_Subprogram_Declaration
is
2600 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
);
2601 -- Relocate certain categorization pragmas from the declarative list
2602 -- of subprogram body From and insert them after node To. The pragmas
2605 -- Volatile_Function
2606 -- Also copy pragma SPARK_Mode if present in the declarative list
2607 -- of subprogram body From and insert it after node To. This pragma
2608 -- should not be moved, as it applies to the body too.
2614 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
) is
2616 Next_Decl
: Node_Id
;
2619 pragma Assert
(Nkind
(From
) = N_Subprogram_Body
);
2621 -- The destination node must be part of a list, as the pragmas are
2622 -- inserted after it.
2624 pragma Assert
(Is_List_Member
(To
));
2626 -- Inspect the declarations of the subprogram body looking for
2627 -- specific pragmas.
2629 Decl
:= First
(Declarations
(N
));
2630 while Present
(Decl
) loop
2631 Next_Decl
:= Next
(Decl
);
2633 if Nkind
(Decl
) = N_Pragma
then
2634 if Pragma_Name_Unmapped
(Decl
) = Name_SPARK_Mode
then
2635 Insert_After
(To
, New_Copy_Tree
(Decl
));
2637 elsif Nam_In
(Pragma_Name_Unmapped
(Decl
),
2639 Name_Volatile_Function
)
2642 Insert_After
(To
, Decl
);
2653 Subp_Decl
: Node_Id
;
2655 -- Start of processing for Build_Subprogram_Declaration
2658 -- Create a matching subprogram spec using the profile of the body.
2659 -- The structure of the tree is identical, but has new entities for
2660 -- the defining unit name and formal parameters.
2663 Make_Subprogram_Declaration
(Loc
,
2664 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2665 Set_Comes_From_Source
(Subp_Decl
, True);
2667 -- Relocate the aspects and relevant pragmas from the subprogram body
2668 -- to the generated spec because it acts as the initial declaration.
2670 Insert_Before
(N
, Subp_Decl
);
2671 Move_Aspects
(N
, To
=> Subp_Decl
);
2672 Move_Pragmas
(N
, To
=> Subp_Decl
);
2674 -- Ensure that the generated corresponding spec and original body
2675 -- share the same SPARK_Mode pragma or aspect. As a result, both have
2676 -- the same SPARK_Mode attributes, and the global SPARK_Mode value is
2677 -- correctly set for local subprograms.
2679 Copy_SPARK_Mode_Aspect
(Subp_Decl
, To
=> N
);
2681 Analyze
(Subp_Decl
);
2683 -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to
2684 -- the body since the expander may generate calls using that entity.
2685 -- Required to ensure that Expand_Call rewrites calls to this
2686 -- function by calls to the built procedure.
2688 if Modify_Tree_For_C
2689 and then Nkind
(Body_Spec
) = N_Function_Specification
2691 Rewritten_For_C
(Defining_Entity
(Specification
(Subp_Decl
)))
2693 Set_Rewritten_For_C
(Defining_Entity
(Body_Spec
));
2694 Set_Corresponding_Procedure
(Defining_Entity
(Body_Spec
),
2695 Corresponding_Procedure
2696 (Defining_Entity
(Specification
(Subp_Decl
))));
2699 -- Analyze any relocated source pragmas or pragmas created for aspect
2702 Decl
:= Next
(Subp_Decl
);
2703 while Present
(Decl
) loop
2705 -- Stop the search for pragmas once the body has been reached as
2706 -- this terminates the region where pragmas may appear.
2711 elsif Nkind
(Decl
) = N_Pragma
then
2718 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2719 Set_Corresponding_Spec
(N
, Spec_Id
);
2721 -- Mark the generated spec as a source construct to ensure that all
2722 -- calls to it are properly registered in ALI files for GNATprove.
2724 Set_Comes_From_Source
(Spec_Id
, True);
2726 -- Ensure that the specs of the subprogram declaration and its body
2727 -- are identical, otherwise they will appear non-conformant due to
2728 -- rewritings in the default values of formal parameters.
2730 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2731 Set_Specification
(N
, Body_Spec
);
2732 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2733 end Build_Subprogram_Declaration
;
2735 ----------------------------
2736 -- Check_Anonymous_Return --
2737 ----------------------------
2739 procedure Check_Anonymous_Return
is
2745 if Present
(Spec_Id
) then
2751 if Ekind
(Scop
) = E_Function
2752 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2753 and then not Is_Thunk
(Scop
)
2755 -- Skip internally built functions which handle the case of
2756 -- a null access (see Expand_Interface_Conversion)
2758 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2759 and then not Comes_From_Source
(Parent
(Scop
)))
2761 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2763 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2765 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2766 and then Expander_Active
2768 -- Avoid cases with no tasking support
2770 and then RTE_Available
(RE_Current_Master
)
2771 and then not Restriction_Active
(No_Task_Hierarchy
)
2774 Make_Object_Declaration
(Loc
,
2775 Defining_Identifier
=>
2776 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2777 Constant_Present
=> True,
2778 Object_Definition
=>
2779 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2781 Make_Explicit_Dereference
(Loc
,
2782 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2784 if Present
(Declarations
(N
)) then
2785 Prepend
(Decl
, Declarations
(N
));
2787 Set_Declarations
(N
, New_List
(Decl
));
2790 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2791 Set_Has_Master_Entity
(Scop
);
2793 -- Now mark the containing scope as a task master
2796 while Nkind
(Par
) /= N_Compilation_Unit
loop
2797 Par
:= Parent
(Par
);
2798 pragma Assert
(Present
(Par
));
2800 -- If we fall off the top, we are at the outer level, and
2801 -- the environment task is our effective master, so nothing
2805 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2807 Set_Is_Task_Master
(Par
, True);
2812 end Check_Anonymous_Return
;
2814 -------------------------
2815 -- Check_Inline_Pragma --
2816 -------------------------
2818 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2822 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2823 -- True when N is a pragma Inline or Inline_Always that applies
2824 -- to this subprogram.
2826 -----------------------
2827 -- Is_Inline_Pragma --
2828 -----------------------
2830 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2832 if Nkind
(N
) = N_Pragma
2834 (Pragma_Name_Unmapped
(N
) = Name_Inline_Always
2835 or else (Pragma_Name_Unmapped
(N
) = Name_Inline
2837 (Front_End_Inlining
or else Optimization_Level
> 0)))
2838 and then Present
(Pragma_Argument_Associations
(N
))
2841 Pragma_Arg
: Node_Id
:=
2842 Expression
(First
(Pragma_Argument_Associations
(N
)));
2844 if Nkind
(Pragma_Arg
) = N_Selected_Component
then
2845 Pragma_Arg
:= Selector_Name
(Pragma_Arg
);
2848 return Chars
(Pragma_Arg
) = Chars
(Body_Id
);
2854 end Is_Inline_Pragma
;
2856 -- Start of processing for Check_Inline_Pragma
2859 if not Expander_Active
then
2863 if Is_List_Member
(N
)
2864 and then Present
(Next
(N
))
2865 and then Is_Inline_Pragma
(Next
(N
))
2869 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2870 and then Present
(Declarations
(N
))
2871 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2873 Prag
:= First
(Declarations
(N
));
2879 if Present
(Prag
) then
2880 if Present
(Spec_Id
) then
2881 if Is_List_Member
(N
)
2882 and then Is_List_Member
(Unit_Declaration_Node
(Spec_Id
))
2883 and then In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
))
2889 -- Create a subprogram declaration, to make treatment uniform.
2890 -- Make the sloc of the subprogram name that of the entity in
2891 -- the body, so that style checks find identical strings.
2894 Subp
: constant Entity_Id
:=
2895 Make_Defining_Identifier
2896 (Sloc
(Body_Id
), Chars
(Body_Id
));
2897 Decl
: constant Node_Id
:=
2898 Make_Subprogram_Declaration
(Loc
,
2900 New_Copy_Tree
(Specification
(N
)));
2903 -- Link the body and the generated spec
2905 Set_Corresponding_Body
(Decl
, Body_Id
);
2906 Set_Corresponding_Spec
(N
, Subp
);
2908 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2910 -- To ensure proper coverage when body is inlined, indicate
2911 -- whether the subprogram comes from source.
2913 Set_Comes_From_Source
(Subp
, Comes_From_Source
(N
));
2915 if Present
(First_Formal
(Body_Id
)) then
2916 Plist
:= Copy_Parameter_List
(Body_Id
);
2917 Set_Parameter_Specifications
2918 (Specification
(Decl
), Plist
);
2921 -- Move aspects to the new spec
2923 if Has_Aspects
(N
) then
2924 Move_Aspects
(N
, To
=> Decl
);
2927 Insert_Before
(N
, Decl
);
2930 Set_Has_Pragma_Inline
(Subp
);
2932 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2933 Set_Is_Inlined
(Subp
);
2934 Set_Has_Pragma_Inline_Always
(Subp
);
2937 -- Prior to copying the subprogram body to create a template
2938 -- for it for subsequent inlining, remove the pragma from
2939 -- the current body so that the copy that will produce the
2940 -- new body will start from a completely unanalyzed tree.
2942 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2943 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2950 end Check_Inline_Pragma
;
2952 --------------------------
2953 -- Check_Missing_Return --
2954 --------------------------
2956 procedure Check_Missing_Return
is
2958 Missing_Ret
: Boolean;
2961 if Nkind
(Body_Spec
) = N_Function_Specification
then
2962 if Present
(Spec_Id
) then
2968 if Return_Present
(Id
) then
2969 Check_Returns
(HSS
, 'F', Missing_Ret
);
2972 Set_Has_Missing_Return
(Id
);
2975 -- Within a premature instantiation of a package with no body, we
2976 -- build completions of the functions therein, with a Raise
2977 -- statement. No point in complaining about a missing return in
2980 elsif Ekind
(Id
) = E_Function
2981 and then In_Instance
2982 and then Present
(Statements
(HSS
))
2983 and then Nkind
(First
(Statements
(HSS
))) = N_Raise_Program_Error
2987 elsif Is_Generic_Subprogram
(Id
)
2988 or else not Is_Machine_Code_Subprogram
(Id
)
2990 Error_Msg_N
("missing RETURN statement in function body", N
);
2993 -- If procedure with No_Return, check returns
2995 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2996 and then Present
(Spec_Id
)
2997 and then No_Return
(Spec_Id
)
2999 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
3002 -- Special checks in SPARK mode
3004 if Nkind
(Body_Spec
) = N_Function_Specification
then
3006 -- In SPARK mode, last statement of a function should be a return
3009 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
3012 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
3013 N_Extended_Return_Statement
)
3015 Check_SPARK_05_Restriction
3016 ("last statement in function should be RETURN", Stat
);
3020 -- In SPARK mode, verify that a procedure has no return
3022 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
3023 if Present
(Spec_Id
) then
3029 -- Would be nice to point to return statement here, can we
3030 -- borrow the Check_Returns procedure here ???
3032 if Return_Present
(Id
) then
3033 Check_SPARK_05_Restriction
3034 ("procedure should not have RETURN", N
);
3037 end Check_Missing_Return
;
3039 -----------------------
3040 -- Disambiguate_Spec --
3041 -----------------------
3043 function Disambiguate_Spec
return Entity_Id
is
3044 Priv_Spec
: Entity_Id
;
3047 procedure Replace_Types
(To_Corresponding
: Boolean);
3048 -- Depending on the flag, replace the type of formal parameters of
3049 -- Body_Id if it is a concurrent type implementing interfaces with
3050 -- the corresponding record type or the other way around.
3052 procedure Replace_Types
(To_Corresponding
: Boolean) is
3054 Formal_Typ
: Entity_Id
;
3057 Formal
:= First_Formal
(Body_Id
);
3058 while Present
(Formal
) loop
3059 Formal_Typ
:= Etype
(Formal
);
3061 if Is_Class_Wide_Type
(Formal_Typ
) then
3062 Formal_Typ
:= Root_Type
(Formal_Typ
);
3065 -- From concurrent type to corresponding record
3067 if To_Corresponding
then
3068 if Is_Concurrent_Type
(Formal_Typ
)
3069 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
3072 (Corresponding_Record_Type
(Formal_Typ
)))
3075 Corresponding_Record_Type
(Formal_Typ
));
3078 -- From corresponding record to concurrent type
3081 if Is_Concurrent_Record_Type
(Formal_Typ
)
3082 and then Present
(Interfaces
(Formal_Typ
))
3085 Corresponding_Concurrent_Type
(Formal_Typ
));
3089 Next_Formal
(Formal
);
3093 -- Start of processing for Disambiguate_Spec
3096 -- Try to retrieve the specification of the body as is. All error
3097 -- messages are suppressed because the body may not have a spec in
3098 -- its current state.
3100 Spec_N
:= Find_Corresponding_Spec
(N
, False);
3102 -- It is possible that this is the body of a primitive declared
3103 -- between a private and a full view of a concurrent type. The
3104 -- controlling parameter of the spec carries the concurrent type,
3105 -- not the corresponding record type as transformed by Analyze_
3106 -- Subprogram_Specification. In such cases, we undo the change
3107 -- made by the analysis of the specification and try to find the
3110 -- Note that wrappers already have their corresponding specs and
3111 -- bodies set during their creation, so if the candidate spec is
3112 -- a wrapper, then we definitely need to swap all types to their
3113 -- original concurrent status.
3116 or else Is_Primitive_Wrapper
(Spec_N
)
3118 -- Restore all references of corresponding record types to the
3119 -- original concurrent types.
3121 Replace_Types
(To_Corresponding
=> False);
3122 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
3124 -- The current body truly belongs to a primitive declared between
3125 -- a private and a full view. We leave the modified body as is,
3126 -- and return the true spec.
3128 if Present
(Priv_Spec
)
3129 and then Is_Private_Primitive
(Priv_Spec
)
3134 -- In case that this is some sort of error, restore the original
3135 -- state of the body.
3137 Replace_Types
(To_Corresponding
=> True);
3141 end Disambiguate_Spec
;
3143 ----------------------------
3144 -- Exchange_Limited_Views --
3145 ----------------------------
3147 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
is
3148 Result
: Elist_Id
:= No_Elist
;
3150 procedure Detect_And_Exchange
(Id
: Entity_Id
);
3151 -- Determine whether Id's type denotes an incomplete type associated
3152 -- with a limited with clause and exchange the limited view with the
3153 -- non-limited one when available. Note that the non-limited view
3154 -- may exist because of a with_clause in another unit in the context,
3155 -- but cannot be used because the current view of the enclosing unit
3156 -- is still a limited view.
3158 -------------------------
3159 -- Detect_And_Exchange --
3160 -------------------------
3162 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
3163 Typ
: constant Entity_Id
:= Etype
(Id
);
3165 if From_Limited_With
(Typ
)
3166 and then Has_Non_Limited_View
(Typ
)
3167 and then not From_Limited_With
(Scope
(Typ
))
3170 Result
:= New_Elmt_List
;
3173 Prepend_Elmt
(Typ
, Result
);
3174 Prepend_Elmt
(Id
, Result
);
3175 Set_Etype
(Id
, Non_Limited_View
(Typ
));
3177 end Detect_And_Exchange
;
3183 -- Start of processing for Exchange_Limited_Views
3186 -- Do not process subprogram bodies as they already use the non-
3187 -- limited view of types.
3189 if not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
3193 -- Examine all formals and swap views when applicable
3195 Formal
:= First_Formal
(Subp_Id
);
3196 while Present
(Formal
) loop
3197 Detect_And_Exchange
(Formal
);
3199 Next_Formal
(Formal
);
3202 -- Process the return type of a function
3204 if Ekind
(Subp_Id
) = E_Function
then
3205 Detect_And_Exchange
(Subp_Id
);
3209 end Exchange_Limited_Views
;
3211 -------------------------------------
3212 -- Is_Private_Concurrent_Primitive --
3213 -------------------------------------
3215 function Is_Private_Concurrent_Primitive
3216 (Subp_Id
: Entity_Id
) return Boolean
3218 Formal_Typ
: Entity_Id
;
3221 if Present
(First_Formal
(Subp_Id
)) then
3222 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
3224 if Is_Concurrent_Record_Type
(Formal_Typ
) then
3225 if Is_Class_Wide_Type
(Formal_Typ
) then
3226 Formal_Typ
:= Root_Type
(Formal_Typ
);
3229 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
3232 -- The type of the first formal is a concurrent tagged type with
3236 Is_Concurrent_Type
(Formal_Typ
)
3237 and then Is_Tagged_Type
(Formal_Typ
)
3238 and then Has_Private_Declaration
(Formal_Typ
);
3242 end Is_Private_Concurrent_Primitive
;
3244 -------------------------
3245 -- Mask_Unfrozen_Types --
3246 -------------------------
3248 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
is
3249 Result
: Elist_Id
:= No_Elist
;
3251 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
;
3252 -- Mask all types referenced in the subtree rooted at Node
3254 --------------------
3255 -- Mask_Type_Refs --
3256 --------------------
3258 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
is
3259 procedure Mask_Type
(Typ
: Entity_Id
);
3260 -- ??? what does this do?
3266 procedure Mask_Type
(Typ
: Entity_Id
) is
3268 -- Skip Itypes created by the preanalysis
3271 and then Scope_Within_Or_Same
(Scope
(Typ
), Spec_Id
)
3276 if not Is_Frozen
(Typ
) then
3277 Set_Is_Frozen
(Typ
);
3278 Append_New_Elmt
(Typ
, Result
);
3282 -- Start of processing for Mask_Type_Refs
3285 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
3286 Mask_Type
(Etype
(Entity
(Node
)));
3288 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
3289 Mask_Type
(Scope
(Entity
(Node
)));
3292 elsif Nkind_In
(Node
, N_Aggregate
, N_Null
, N_Type_Conversion
)
3293 and then Present
(Etype
(Node
))
3295 Mask_Type
(Etype
(Node
));
3301 procedure Mask_References
is new Traverse_Proc
(Mask_Type_Refs
);
3305 Return_Stmt
: constant Node_Id
:=
3306 First
(Statements
(Handled_Statement_Sequence
(N
)));
3308 -- Start of processing for Mask_Unfrozen_Types
3311 pragma Assert
(Nkind
(Return_Stmt
) = N_Simple_Return_Statement
);
3313 Mask_References
(Expression
(Return_Stmt
));
3316 end Mask_Unfrozen_Types
;
3318 ---------------------------
3319 -- Restore_Limited_Views --
3320 ---------------------------
3322 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
) is
3323 Elmt
: Elmt_Id
:= First_Elmt
(Restore_List
);
3327 while Present
(Elmt
) loop
3330 Set_Etype
(Id
, Node
(Elmt
));
3333 end Restore_Limited_Views
;
3335 ----------------------------
3336 -- Set_Trivial_Subprogram --
3337 ----------------------------
3339 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
3340 Nxt
: constant Node_Id
:= Next
(N
);
3343 Set_Is_Trivial_Subprogram
(Body_Id
);
3345 if Present
(Spec_Id
) then
3346 Set_Is_Trivial_Subprogram
(Spec_Id
);
3350 and then Nkind
(Nxt
) = N_Simple_Return_Statement
3351 and then No
(Next
(Nxt
))
3352 and then Present
(Expression
(Nxt
))
3353 and then Is_Entity_Name
(Expression
(Nxt
))
3355 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
3357 end Set_Trivial_Subprogram
;
3359 ---------------------------
3360 -- Unmask_Unfrozen_Types --
3361 ---------------------------
3363 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
) is
3364 Elmt
: Elmt_Id
:= First_Elmt
(Unmask_List
);
3367 while Present
(Elmt
) loop
3368 Set_Is_Frozen
(Node
(Elmt
), False);
3371 end Unmask_Unfrozen_Types
;
3373 ---------------------------------
3374 -- Verify_Overriding_Indicator --
3375 ---------------------------------
3377 procedure Verify_Overriding_Indicator
is
3379 if Must_Override
(Body_Spec
) then
3380 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3381 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3385 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
3387 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
3389 -- Overriding indicators aren't allowed for protected subprogram
3390 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3391 -- this to a warning if -gnatd.E is enabled.
3393 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3394 Error_Msg_Warn
:= Error_To_Warning
;
3396 ("<<overriding indicator not allowed for protected "
3397 & "subprogram body", Body_Spec
);
3400 elsif Must_Not_Override
(Body_Spec
) then
3401 if Present
(Overridden_Operation
(Spec_Id
)) then
3403 ("subprogram& overrides inherited operation",
3404 Body_Spec
, Spec_Id
);
3406 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3407 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3410 ("subprogram& overrides predefined operator ",
3411 Body_Spec
, Spec_Id
);
3413 -- Overriding indicators aren't allowed for protected subprogram
3414 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3415 -- this to a warning if -gnatd.E is enabled.
3417 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3418 Error_Msg_Warn
:= Error_To_Warning
;
3421 ("<<overriding indicator not allowed "
3422 & "for protected subprogram body", Body_Spec
);
3424 -- If this is not a primitive operation, then the overriding
3425 -- indicator is altogether illegal.
3427 elsif not Is_Primitive
(Spec_Id
) then
3429 ("overriding indicator only allowed "
3430 & "if subprogram is primitive", Body_Spec
);
3433 -- If checking the style rule and the operation overrides, then
3434 -- issue a warning about a missing overriding_indicator. Protected
3435 -- subprogram bodies are excluded from this style checking, since
3436 -- they aren't primitives (even though their declarations can
3437 -- override) and aren't allowed to have an overriding_indicator.
3440 and then Present
(Overridden_Operation
(Spec_Id
))
3441 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3443 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3444 Style
.Missing_Overriding
(N
, Body_Id
);
3447 and then Can_Override_Operator
(Spec_Id
)
3448 and then not In_Predefined_Unit
(Spec_Id
)
3450 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3451 Style
.Missing_Overriding
(N
, Body_Id
);
3453 end Verify_Overriding_Indicator
;
3457 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3458 Saved_ISMP
: constant Boolean :=
3459 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3460 -- Save the Ghost and SPARK mode-related data to restore on exit
3462 -- Start of processing for Analyze_Subprogram_Body_Helper
3465 -- A [generic] subprogram body "freezes" the contract of the nearest
3466 -- enclosing package body and all other contracts encountered in the
3467 -- same declarative part up to and excluding the subprogram body:
3469 -- package body Nearest_Enclosing_Package
3470 -- with Refined_State => (State => Constit)
3474 -- procedure Freezes_Enclosing_Package_Body
3475 -- with Refined_Depends => (Input => Constit) ...
3477 -- This ensures that any annotations referenced by the contract of the
3478 -- [generic] subprogram body are available. This form of "freezing" is
3479 -- decoupled from the usual Freeze_xxx mechanism because it must also
3480 -- work in the context of generics where normal freezing is disabled.
3482 -- Only bodies coming from source should cause this type of "freezing".
3483 -- Expression functions that act as bodies and complete an initial
3484 -- declaration must be included in this category, hence the use of
3487 if Comes_From_Source
(Original_Node
(N
)) then
3488 Analyze_Previous_Contracts
(N
);
3491 -- Generic subprograms are handled separately. They always have a
3492 -- generic specification. Determine whether current scope has a
3493 -- previous declaration.
3495 -- If the subprogram body is defined within an instance of the same
3496 -- name, the instance appears as a package renaming, and will be hidden
3497 -- within the subprogram.
3499 if Present
(Prev_Id
)
3500 and then not Is_Overloadable
(Prev_Id
)
3501 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3502 or else Comes_From_Source
(Prev_Id
))
3504 if Is_Generic_Subprogram
(Prev_Id
) then
3507 -- A subprogram body is Ghost when it is stand alone and subject
3508 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3509 -- the mode now to ensure that any nodes generated during analysis
3510 -- and expansion are properly marked as Ghost.
3512 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3514 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3515 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3517 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3519 if Nkind
(N
) = N_Subprogram_Body
then
3520 HSS
:= Handled_Statement_Sequence
(N
);
3521 Check_Missing_Return
;
3526 -- Otherwise a previous entity conflicts with the subprogram name.
3527 -- Attempting to enter name will post error.
3530 Enter_Name
(Body_Id
);
3534 -- Non-generic case, find the subprogram declaration, if one was seen,
3535 -- or enter new overloaded entity in the current scope. If the
3536 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3537 -- part of the context of one of its subunits. No need to redo the
3540 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3544 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3546 if Nkind
(N
) = N_Subprogram_Body_Stub
3547 or else No
(Corresponding_Spec
(N
))
3549 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3550 Spec_Id
:= Disambiguate_Spec
;
3552 -- A subprogram body is Ghost when it is stand alone and
3553 -- subject to pragma Ghost or when the corresponding spec is
3554 -- Ghost. Set the mode now to ensure that any nodes generated
3555 -- during analysis and expansion are properly marked as Ghost.
3557 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3560 Spec_Id
:= Find_Corresponding_Spec
(N
);
3562 -- A subprogram body is Ghost when it is stand alone and
3563 -- subject to pragma Ghost or when the corresponding spec is
3564 -- Ghost. Set the mode now to ensure that any nodes generated
3565 -- during analysis and expansion are properly marked as Ghost.
3567 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3569 -- In GNATprove mode, if the body has no previous spec, create
3570 -- one so that the inlining machinery can operate properly.
3571 -- Transfer aspects, if any, to the new spec, so that they
3572 -- are legal and can be processed ahead of the body.
3573 -- We make two copies of the given spec, one for the new
3574 -- declaration, and one for the body.
3576 if No
(Spec_Id
) and then GNATprove_Mode
3578 -- Inlining does not apply during pre-analysis of code
3580 and then Full_Analysis
3582 -- Inlining only applies to full bodies, not stubs
3584 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3586 -- Inlining only applies to bodies in the source code, not to
3587 -- those generated by the compiler. In particular, expression
3588 -- functions, whose body is generated by the compiler, are
3589 -- treated specially by GNATprove.
3591 and then Comes_From_Source
(Body_Id
)
3593 -- This cannot be done for a compilation unit, which is not
3594 -- in a context where we can insert a new spec.
3596 and then Is_List_Member
(N
)
3598 -- Inlining only applies to subprograms without contracts,
3599 -- as a contract is a sign that GNATprove should perform a
3600 -- modular analysis of the subprogram instead of a contextual
3601 -- analysis at each call site. The same test is performed in
3602 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3603 -- here in another form (because the contract has not been
3604 -- attached to the body) to avoid front-end errors in case
3605 -- pragmas are used instead of aspects, because the
3606 -- corresponding pragmas in the body would not be transferred
3607 -- to the spec, leading to legality errors.
3609 and then not Body_Has_Contract
3610 and then not Inside_A_Generic
3612 Build_Subprogram_Declaration
;
3614 -- If this is a function that returns a constrained array, and
3615 -- we are generating SPARK_For_C, create subprogram declaration
3616 -- to simplify subsequent C generation.
3619 and then Modify_Tree_For_C
3620 and then Nkind
(Body_Spec
) = N_Function_Specification
3621 and then Is_Array_Type
(Etype
(Body_Id
))
3622 and then Is_Constrained
(Etype
(Body_Id
))
3624 Build_Subprogram_Declaration
;
3628 -- If this is a duplicate body, no point in analyzing it
3630 if Error_Posted
(N
) then
3634 -- A subprogram body should cause freezing of its own declaration,
3635 -- but if there was no previous explicit declaration, then the
3636 -- subprogram will get frozen too late (there may be code within
3637 -- the body that depends on the subprogram having been frozen,
3638 -- such as uses of extra formals), so we force it to be frozen
3639 -- here. Same holds if the body and spec are compilation units.
3640 -- Finally, if the return type is an anonymous access to protected
3641 -- subprogram, it must be frozen before the body because its
3642 -- expansion has generated an equivalent type that is used when
3643 -- elaborating the body.
3645 -- An exception in the case of Ada 2012, AI05-177: The bodies
3646 -- created for expression functions do not freeze.
3649 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3651 Freeze_Before
(N
, Body_Id
);
3653 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3654 Freeze_Before
(N
, Spec_Id
);
3656 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3657 Freeze_Before
(N
, Etype
(Body_Id
));
3661 Spec_Id
:= Corresponding_Spec
(N
);
3663 -- A subprogram body is Ghost when it is stand alone and subject
3664 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3665 -- the mode now to ensure that any nodes generated during analysis
3666 -- and expansion are properly marked as Ghost.
3668 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3672 -- Previously we scanned the body to look for nested subprograms, and
3673 -- rejected an inline directive if nested subprograms were present,
3674 -- because the back-end would generate conflicting symbols for the
3675 -- nested bodies. This is now unnecessary.
3677 -- Look ahead to recognize a pragma Inline that appears after the body
3679 Check_Inline_Pragma
(Spec_Id
);
3681 -- Deal with special case of a fully private operation in the body of
3682 -- the protected type. We must create a declaration for the subprogram,
3683 -- in order to attach the protected subprogram that will be used in
3684 -- internal calls. We exclude compiler generated bodies from the
3685 -- expander since the issue does not arise for those cases.
3688 and then Comes_From_Source
(N
)
3689 and then Is_Protected_Type
(Current_Scope
)
3691 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3694 -- If we are generating C and this is a function returning a constrained
3695 -- array type for which we must create a procedure with an extra out
3696 -- parameter, build and analyze the body now. The procedure declaration
3697 -- has already been created. We reuse the source body of the function,
3698 -- because in an instance it may contain global references that cannot
3699 -- be reanalyzed. The source function itself is not used any further,
3700 -- so we mark it as having a completion. If the subprogram is a stub the
3701 -- transformation is done later, when the proper body is analyzed.
3704 and then Modify_Tree_For_C
3705 and then Present
(Spec_Id
)
3706 and then Ekind
(Spec_Id
) = E_Function
3707 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3708 and then Rewritten_For_C
(Spec_Id
)
3710 Set_Has_Completion
(Spec_Id
);
3712 Rewrite
(N
, Build_Procedure_Body_Form
(Spec_Id
, N
));
3715 -- The entity for the created procedure must remain invisible, so it
3716 -- does not participate in resolution of subsequent references to the
3719 Set_Is_Immediately_Visible
(Corresponding_Spec
(N
), False);
3723 -- If a separate spec is present, then deal with freezing issues
3725 if Present
(Spec_Id
) then
3726 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3727 Verify_Overriding_Indicator
;
3729 -- In general, the spec will be frozen when we start analyzing the
3730 -- body. However, for internally generated operations, such as
3731 -- wrapper functions for inherited operations with controlling
3732 -- results, the spec may not have been frozen by the time we expand
3733 -- the freeze actions that include the bodies. In particular, extra
3734 -- formals for accessibility or for return-in-place may need to be
3735 -- generated. Freeze nodes, if any, are inserted before the current
3736 -- body. These freeze actions are also needed in ASIS mode and in
3737 -- Compile_Only mode to enable the proper back-end type annotations.
3738 -- They are necessary in any case to insure order of elaboration
3741 if not Is_Frozen
(Spec_Id
)
3742 and then (Expander_Active
3744 or else (Operating_Mode
= Check_Semantics
3745 and then Serious_Errors_Detected
= 0))
3747 -- The body generated for an expression function that is not a
3748 -- completion is a freeze point neither for the profile nor for
3749 -- anything else. That's why, in order to prevent any freezing
3750 -- during analysis, we need to mask types declared outside the
3751 -- expression that are not yet frozen.
3753 if Nkind
(N
) = N_Subprogram_Body
3754 and then Was_Expression_Function
(N
)
3755 and then not Has_Completion
(Spec_Id
)
3757 Set_Is_Frozen
(Spec_Id
);
3758 Mask_Types
:= Mask_Unfrozen_Types
(Spec_Id
);
3760 Set_Has_Delayed_Freeze
(Spec_Id
);
3761 Freeze_Before
(N
, Spec_Id
);
3766 -- If the subprogram has a class-wide clone, build its body as a copy
3767 -- of the original body, and rewrite body of original subprogram as a
3768 -- wrapper that calls the clone.
3770 if Present
(Spec_Id
)
3771 and then Present
(Class_Wide_Clone
(Spec_Id
))
3772 and then (Comes_From_Source
(N
) or else Was_Expression_Function
(N
))
3774 Build_Class_Wide_Clone_Body
(Spec_Id
, N
);
3776 -- This is the new body for the existing primitive operation
3778 Rewrite
(N
, Build_Class_Wide_Clone_Call
3779 (Sloc
(N
), New_List
, Spec_Id
, Parent
(Spec_Id
)));
3780 Set_Has_Completion
(Spec_Id
, False);
3785 -- Place subprogram on scope stack, and make formals visible. If there
3786 -- is a spec, the visible entity remains that of the spec.
3788 if Present
(Spec_Id
) then
3789 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3791 if Is_Child_Unit
(Spec_Id
) then
3792 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3796 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3799 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3800 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3802 if Is_Abstract_Subprogram
(Spec_Id
) then
3803 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3807 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3808 Set_Has_Completion
(Spec_Id
);
3810 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3811 Prot_Typ
:= Scope
(Spec_Id
);
3814 -- If this is a body generated for a renaming, do not check for
3815 -- full conformance. The check is redundant, because the spec of
3816 -- the body is a copy of the spec in the renaming declaration,
3817 -- and the test can lead to spurious errors on nested defaults.
3819 if Present
(Spec_Decl
)
3820 and then not Comes_From_Source
(N
)
3822 (Nkind
(Original_Node
(Spec_Decl
)) =
3823 N_Subprogram_Renaming_Declaration
3824 or else (Present
(Corresponding_Body
(Spec_Decl
))
3826 Nkind
(Unit_Declaration_Node
3827 (Corresponding_Body
(Spec_Decl
))) =
3828 N_Subprogram_Renaming_Declaration
))
3832 -- Conversely, the spec may have been generated for specless body
3833 -- with an inline pragma. The entity comes from source, which is
3834 -- both semantically correct and necessary for proper inlining.
3835 -- The subprogram declaration itself is not in the source.
3837 elsif Comes_From_Source
(N
)
3838 and then Present
(Spec_Decl
)
3839 and then not Comes_From_Source
(Spec_Decl
)
3840 and then Has_Pragma_Inline
(Spec_Id
)
3847 Fully_Conformant
, True, Conformant
, Body_Id
);
3850 -- If the body is not fully conformant, we have to decide if we
3851 -- should analyze it or not. If it has a really messed up profile
3852 -- then we probably should not analyze it, since we will get too
3853 -- many bogus messages.
3855 -- Our decision is to go ahead in the non-fully conformant case
3856 -- only if it is at least mode conformant with the spec. Note
3857 -- that the call to Check_Fully_Conformant has issued the proper
3858 -- error messages to complain about the lack of conformance.
3861 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3867 if Spec_Id
/= Body_Id
then
3868 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3871 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3873 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3874 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3879 Set_Corresponding_Spec
(N
, Spec_Id
);
3881 -- Ada 2005 (AI-345): If the operation is a primitive operation
3882 -- of a concurrent type, the type of the first parameter has been
3883 -- replaced with the corresponding record, which is the proper
3884 -- run-time structure to use. However, within the body there may
3885 -- be uses of the formals that depend on primitive operations
3886 -- of the type (in particular calls in prefixed form) for which
3887 -- we need the original concurrent type. The operation may have
3888 -- several controlling formals, so the replacement must be done
3891 if Comes_From_Source
(Spec_Id
)
3892 and then Present
(First_Entity
(Spec_Id
))
3893 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3894 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3895 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3896 and then Present
(Corresponding_Concurrent_Type
3897 (Etype
(First_Entity
(Spec_Id
))))
3900 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3904 Form
:= First_Formal
(Spec_Id
);
3905 while Present
(Form
) loop
3906 if Etype
(Form
) = Typ
then
3907 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3915 -- Make the formals visible, and place subprogram on scope stack.
3916 -- This is also the point at which we set Last_Real_Spec_Entity
3917 -- to mark the entities which will not be moved to the body.
3919 Install_Formals
(Spec_Id
);
3920 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3922 -- Within an instance, add local renaming declarations so that
3923 -- gdb can retrieve the values of actuals more easily. This is
3924 -- only relevant if generating code (and indeed we definitely
3925 -- do not want these definitions -gnatc mode, because that would
3928 if Is_Generic_Instance
(Spec_Id
)
3929 and then Is_Wrapper_Package
(Current_Scope
)
3930 and then Expander_Active
3932 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3935 Push_Scope
(Spec_Id
);
3937 -- Make sure that the subprogram is immediately visible. For
3938 -- child units that have no separate spec this is indispensable.
3939 -- Otherwise it is safe albeit redundant.
3941 Set_Is_Immediately_Visible
(Spec_Id
);
3944 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3945 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3946 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3948 -- Case of subprogram body with no previous spec
3951 -- Check for style warning required
3955 -- Only apply check for source level subprograms for which checks
3956 -- have not been suppressed.
3958 and then Comes_From_Source
(Body_Id
)
3959 and then not Suppress_Style_Checks
(Body_Id
)
3961 -- No warnings within an instance
3963 and then not In_Instance
3965 -- No warnings for expression functions
3967 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3969 Style
.Body_With_No_Spec
(N
);
3972 New_Overloaded_Entity
(Body_Id
);
3974 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3975 Set_Acts_As_Spec
(N
);
3976 Generate_Definition
(Body_Id
);
3978 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3980 -- If the body is an entry wrapper created for an entry with
3981 -- preconditions, it must be compiled in the context of the
3982 -- enclosing synchronized object, because it may mention other
3983 -- operations of the type.
3985 if Is_Entry_Wrapper
(Body_Id
) then
3987 Prot
: constant Entity_Id
:= Etype
(First_Entity
(Body_Id
));
3990 Install_Declarations
(Prot
);
3994 Install_Formals
(Body_Id
);
3996 Push_Scope
(Body_Id
);
3999 -- For stubs and bodies with no previous spec, generate references to
4002 Generate_Reference_To_Formals
(Body_Id
);
4005 -- Entry barrier functions are generated outside the protected type and
4006 -- should not carry the SPARK_Mode of the enclosing context.
4008 if Nkind
(N
) = N_Subprogram_Body
4009 and then Is_Entry_Barrier_Function
(N
)
4013 -- The body is generated as part of expression function expansion. When
4014 -- the expression function appears in the visible declarations of a
4015 -- package, the body is added to the private declarations. Since both
4016 -- declarative lists may be subject to a different SPARK_Mode, inherit
4017 -- the mode of the spec.
4019 -- package P with SPARK_Mode is
4020 -- function Expr_Func ... is (...); -- original
4021 -- [function Expr_Func ...;] -- generated spec
4024 -- pragma SPARK_Mode (Off);
4025 -- [function Expr_Func ... is return ...;] -- generated body
4026 -- end P; -- mode is ON
4028 elsif not Comes_From_Source
(N
)
4029 and then Present
(Spec_Id
)
4030 and then Is_Expression_Function
(Spec_Id
)
4032 Set_SPARK_Pragma
(Body_Id
, SPARK_Pragma
(Spec_Id
));
4033 Set_SPARK_Pragma_Inherited
4034 (Body_Id
, SPARK_Pragma_Inherited
(Spec_Id
));
4036 -- Set the SPARK_Mode from the current context (may be overwritten later
4037 -- with explicit pragma). Exclude the case where the SPARK_Mode appears
4038 -- initially on a stand-alone subprogram body, but is then relocated to
4039 -- a generated corresponding spec. In this scenario the mode is shared
4040 -- between the spec and body.
4042 elsif No
(SPARK_Pragma
(Body_Id
)) then
4043 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
4044 Set_SPARK_Pragma_Inherited
(Body_Id
);
4047 -- A subprogram body may be instantiated or inlined at a later pass.
4048 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it
4049 -- applied to the initial declaration of the body.
4051 if Present
(Spec_Id
) then
4052 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
4053 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4057 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in
4058 -- case the body is instantiated or inlined later and out of context.
4059 -- The body uses this attribute to restore the value of the global
4062 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4063 Set_Ignore_SPARK_Mode_Pragmas
(Body_Id
);
4065 elsif Ignore_SPARK_Mode_Pragmas
(Body_Id
) then
4066 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4070 -- If this is the proper body of a stub, we must verify that the stub
4071 -- conforms to the body, and to the previous spec if one was present.
4072 -- We know already that the body conforms to that spec. This test is
4073 -- only required for subprograms that come from source.
4075 if Nkind
(Parent
(N
)) = N_Subunit
4076 and then Comes_From_Source
(N
)
4077 and then not Error_Posted
(Body_Id
)
4078 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
4079 N_Subprogram_Body_Stub
4082 Old_Id
: constant Entity_Id
:=
4084 (Specification
(Corresponding_Stub
(Parent
(N
))));
4086 Conformant
: Boolean := False;
4089 if No
(Spec_Id
) then
4090 Check_Fully_Conformant
(Body_Id
, Old_Id
);
4094 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
4096 if not Conformant
then
4098 -- The stub was taken to be a new declaration. Indicate that
4101 Set_Has_Completion
(Old_Id
, False);
4107 Set_Has_Completion
(Body_Id
);
4108 Check_Eliminated
(Body_Id
);
4110 -- Analyze any aspect specifications that appear on the subprogram body
4111 -- stub. Stop the analysis now as the stub does not have a declarative
4112 -- or a statement part, and it cannot be inlined.
4114 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4115 if Has_Aspects
(N
) then
4116 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4124 -- Note: Normally we don't do any inlining if expansion is off, since
4125 -- we won't generate code in any case. An exception arises in GNATprove
4126 -- mode where we want to expand some calls in place, even with expansion
4127 -- disabled, since the inlining eases formal verification.
4129 if not GNATprove_Mode
4130 and then Expander_Active
4131 and then Serious_Errors_Detected
= 0
4132 and then Present
(Spec_Id
)
4133 and then Has_Pragma_Inline
(Spec_Id
)
4135 -- Legacy implementation (relying on front-end inlining)
4137 if not Back_End_Inlining
then
4138 if (Has_Pragma_Inline_Always
(Spec_Id
)
4139 and then not Opt
.Disable_FE_Inline_Always
)
4140 or else (Front_End_Inlining
4141 and then not Opt
.Disable_FE_Inline
)
4143 Build_Body_To_Inline
(N
, Spec_Id
);
4146 -- New implementation (relying on back-end inlining)
4149 if Has_Pragma_Inline_Always
(Spec_Id
)
4150 or else Optimization_Level
> 0
4152 -- Handle function returning an unconstrained type
4154 if Comes_From_Source
(Body_Id
)
4155 and then Ekind
(Spec_Id
) = E_Function
4156 and then Returns_Unconstrained_Type
(Spec_Id
)
4158 -- If function builds in place, i.e. returns a limited type,
4159 -- inlining cannot be done.
4161 and then not Is_Limited_Type
(Etype
(Spec_Id
))
4163 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
4167 Subp_Body
: constant Node_Id
:=
4168 Unit_Declaration_Node
(Body_Id
);
4169 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
4172 -- Do not pass inlining to the backend if the subprogram
4173 -- has declarations or statements which cannot be inlined
4174 -- by the backend. This check is done here to emit an
4175 -- error instead of the generic warning message reported
4176 -- by the GCC backend (ie. "function might not be
4179 if Present
(Subp_Decl
)
4180 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
4184 elsif Has_Excluded_Statement
4187 (Handled_Statement_Sequence
(Subp_Body
)))
4191 -- If the backend inlining is available then at this
4192 -- stage we only have to mark the subprogram as inlined.
4193 -- The expander will take care of registering it in the
4194 -- table of subprograms inlined by the backend a part of
4195 -- processing calls to it (cf. Expand_Call)
4198 Set_Is_Inlined
(Spec_Id
);
4205 -- In GNATprove mode, inline only when there is a separate subprogram
4206 -- declaration for now, as inlining of subprogram bodies acting as
4207 -- declarations, or subprogram stubs, are not supported by front-end
4208 -- inlining. This inlining should occur after analysis of the body, so
4209 -- that it is known whether the value of SPARK_Mode, which can be
4210 -- defined by a pragma inside the body, is applicable to the body.
4211 -- Inlining can be disabled with switch -gnatdm
4213 elsif GNATprove_Mode
4214 and then Full_Analysis
4215 and then not Inside_A_Generic
4216 and then Present
(Spec_Id
)
4218 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
4219 and then Body_Has_SPARK_Mode_On
4220 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
4221 and then not Body_Has_Contract
4222 and then not Debug_Flag_M
4224 Build_Body_To_Inline
(N
, Spec_Id
);
4227 -- When generating code, inherited pre/postconditions are handled when
4228 -- expanding the corresponding contract.
4230 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
4231 -- of the specification we have to install the private withed units.
4232 -- This holds for child units as well.
4234 if Is_Compilation_Unit
(Body_Id
)
4235 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
4237 Install_Private_With_Clauses
(Body_Id
);
4240 Check_Anonymous_Return
;
4242 -- Set the Protected_Formal field of each extra formal of the protected
4243 -- subprogram to reference the corresponding extra formal of the
4244 -- subprogram that implements it. For regular formals this occurs when
4245 -- the protected subprogram's declaration is expanded, but the extra
4246 -- formals don't get created until the subprogram is frozen. We need to
4247 -- do this before analyzing the protected subprogram's body so that any
4248 -- references to the original subprogram's extra formals will be changed
4249 -- refer to the implementing subprogram's formals (see Expand_Formal).
4251 if Present
(Spec_Id
)
4252 and then Is_Protected_Type
(Scope
(Spec_Id
))
4253 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
4256 Impl_Subp
: constant Entity_Id
:=
4257 Protected_Body_Subprogram
(Spec_Id
);
4258 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
4259 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
4262 while Present
(Prot_Ext_Formal
) loop
4263 pragma Assert
(Present
(Impl_Ext_Formal
));
4264 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
4265 Next_Formal_With_Extras
(Prot_Ext_Formal
);
4266 Next_Formal_With_Extras
(Impl_Ext_Formal
);
4271 -- Now we can go on to analyze the body
4273 HSS
:= Handled_Statement_Sequence
(N
);
4274 Set_Actual_Subtypes
(N
, Current_Scope
);
4276 -- Add a declaration for the Protection object, renaming declarations
4277 -- for discriminals and privals and finally a declaration for the entry
4278 -- family index (if applicable). This form of early expansion is done
4279 -- when the Expander is active because Install_Private_Data_Declarations
4280 -- references entities which were created during regular expansion. The
4281 -- subprogram entity must come from source, and not be an internally
4282 -- generated subprogram.
4285 and then Present
(Prot_Typ
)
4286 and then Present
(Spec_Id
)
4287 and then Comes_From_Source
(Spec_Id
)
4288 and then not Is_Eliminated
(Spec_Id
)
4290 Install_Private_Data_Declarations
4291 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
4294 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
4295 -- may now appear in parameter and result profiles. Since the analysis
4296 -- of a subprogram body may use the parameter and result profile of the
4297 -- spec, swap any limited views with their non-limited counterpart.
4299 if Ada_Version
>= Ada_2012
and then Present
(Spec_Id
) then
4300 Exch_Views
:= Exchange_Limited_Views
(Spec_Id
);
4303 -- If the return type is an anonymous access type whose designated type
4304 -- is the limited view of a class-wide type and the non-limited view is
4305 -- available, update the return type accordingly.
4307 if Ada_Version
>= Ada_2005
and then Present
(Spec_Id
) then
4313 Rtyp
:= Etype
(Spec_Id
);
4315 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
4316 Etyp
:= Directly_Designated_Type
(Rtyp
);
4318 if Is_Class_Wide_Type
(Etyp
)
4319 and then From_Limited_With
(Etyp
)
4322 Set_Directly_Designated_Type
(Rtyp
, Available_View
(Etyp
));
4328 -- Analyze any aspect specifications that appear on the subprogram body
4330 if Has_Aspects
(N
) then
4331 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4334 Analyze_Declarations
(Declarations
(N
));
4336 -- Verify that the SPARK_Mode of the body agrees with that of its spec
4338 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
4339 if Present
(SPARK_Pragma
(Spec_Id
)) then
4340 if Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Spec_Id
)) = Off
4342 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
4344 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4345 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
4346 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
4348 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
4351 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
4355 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4356 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
4357 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
4359 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
4363 -- A subprogram body "freezes" its own contract. Analyze the contract
4364 -- after the declarations of the body have been processed as pragmas
4365 -- are now chained on the contract of the subprogram body.
4367 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
4369 -- Check completion, and analyze the statements
4372 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
4375 -- Deal with end of scope processing for the body
4377 Process_End_Label
(HSS
, 't', Current_Scope
);
4378 Update_Use_Clause_Chain
;
4381 -- If we are compiling an entry wrapper, remove the enclosing
4382 -- synchronized object from the stack.
4384 if Is_Entry_Wrapper
(Body_Id
) then
4388 Check_Subprogram_Order
(N
);
4389 Set_Analyzed
(Body_Id
);
4391 -- If we have a separate spec, then the analysis of the declarations
4392 -- caused the entities in the body to be chained to the spec id, but
4393 -- we want them chained to the body id. Only the formal parameters
4394 -- end up chained to the spec id in this case.
4396 if Present
(Spec_Id
) then
4398 -- We must conform to the categorization of our spec
4400 Validate_Categorization_Dependency
(N
, Spec_Id
);
4402 -- And if this is a child unit, the parent units must conform
4404 if Is_Child_Unit
(Spec_Id
) then
4405 Validate_Categorization_Dependency
4406 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
4409 -- Here is where we move entities from the spec to the body
4411 -- Case where there are entities that stay with the spec
4413 if Present
(Last_Real_Spec_Entity
) then
4415 -- No body entities (happens when the only real spec entities come
4416 -- from precondition and postcondition pragmas).
4418 if No
(Last_Entity
(Body_Id
)) then
4419 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
4421 -- Body entities present (formals), so chain stuff past them
4425 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
4428 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
4429 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4430 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
4432 -- Case where there are no spec entities, in this case there can be
4433 -- no body entities either, so just move everything.
4435 -- If the body is generated for an expression function, it may have
4436 -- been preanalyzed already, if 'access was applied to it.
4439 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
4440 N_Expression_Function
4442 pragma Assert
(No
(Last_Entity
(Body_Id
)));
4446 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
4447 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4448 Set_First_Entity
(Spec_Id
, Empty
);
4449 Set_Last_Entity
(Spec_Id
, Empty
);
4453 Check_Missing_Return
;
4455 -- Now we are going to check for variables that are never modified in
4456 -- the body of the procedure. But first we deal with a special case
4457 -- where we want to modify this check. If the body of the subprogram
4458 -- starts with a raise statement or its equivalent, or if the body
4459 -- consists entirely of a null statement, then it is pretty obvious that
4460 -- it is OK to not reference the parameters. For example, this might be
4461 -- the following common idiom for a stubbed function: statement of the
4462 -- procedure raises an exception. In particular this deals with the
4463 -- common idiom of a stubbed function, which appears something like:
4465 -- function F (A : Integer) return Some_Type;
4468 -- raise Program_Error;
4472 -- Here the purpose of X is simply to satisfy the annoying requirement
4473 -- in Ada that there be at least one return, and we certainly do not
4474 -- want to go posting warnings on X that it is not initialized. On
4475 -- the other hand, if X is entirely unreferenced that should still
4478 -- What we do is to detect these cases, and if we find them, flag the
4479 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
4480 -- suppress unwanted warnings. For the case of the function stub above
4481 -- we have a special test to set X as apparently assigned to suppress
4488 -- Skip call markers installed by the ABE mechanism, labels, and
4489 -- Push_xxx_Error_Label to find the first real statement.
4491 Stm
:= First
(Statements
(HSS
));
4492 while Nkind_In
(Stm
, N_Call_Marker
, N_Label
)
4493 or else Nkind
(Stm
) in N_Push_xxx_Label
4498 -- Do the test on the original statement before expansion
4501 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
4504 -- If explicit raise statement, turn on flag
4506 if Nkind
(Ostm
) = N_Raise_Statement
then
4507 Set_Trivial_Subprogram
(Stm
);
4509 -- If null statement, and no following statements, turn on flag
4511 elsif Nkind
(Stm
) = N_Null_Statement
4512 and then Comes_From_Source
(Stm
)
4513 and then No
(Next
(Stm
))
4515 Set_Trivial_Subprogram
(Stm
);
4517 -- Check for explicit call cases which likely raise an exception
4519 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
4520 if Is_Entity_Name
(Name
(Ostm
)) then
4522 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
4525 -- If the procedure is marked No_Return, then likely it
4526 -- raises an exception, but in any case it is not coming
4527 -- back here, so turn on the flag.
4530 and then Ekind
(Ent
) = E_Procedure
4531 and then No_Return
(Ent
)
4533 Set_Trivial_Subprogram
(Stm
);
4541 -- Check for variables that are never modified
4548 -- If there is a separate spec, then transfer Never_Set_In_Source
4549 -- flags from out parameters to the corresponding entities in the
4550 -- body. The reason we do that is we want to post error flags on
4551 -- the body entities, not the spec entities.
4553 if Present
(Spec_Id
) then
4554 E1
:= First_Entity
(Spec_Id
);
4555 while Present
(E1
) loop
4556 if Ekind
(E1
) = E_Out_Parameter
then
4557 E2
:= First_Entity
(Body_Id
);
4558 while Present
(E2
) loop
4559 exit when Chars
(E1
) = Chars
(E2
);
4563 if Present
(E2
) then
4564 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
4572 -- Check references in body
4574 Check_References
(Body_Id
);
4577 -- Check for nested subprogram, and mark outer level subprogram if so
4583 if Present
(Spec_Id
) then
4590 Ent
:= Enclosing_Subprogram
(Ent
);
4591 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
4594 if Present
(Ent
) then
4595 Set_Has_Nested_Subprogram
(Ent
);
4599 -- Restore the limited views in the spec, if any, to let the back end
4600 -- process it without running into circularities.
4602 if Exch_Views
/= No_Elist
then
4603 Restore_Limited_Views
(Exch_Views
);
4606 if Mask_Types
/= No_Elist
then
4607 Unmask_Unfrozen_Types
(Mask_Types
);
4610 if Present
(Desig_View
) then
4611 Set_Directly_Designated_Type
(Etype
(Spec_Id
), Desig_View
);
4615 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4616 Restore_Ghost_Mode
(Saved_GM
);
4617 end Analyze_Subprogram_Body_Helper
;
4619 ------------------------------------
4620 -- Analyze_Subprogram_Declaration --
4621 ------------------------------------
4623 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4624 Scop
: constant Entity_Id
:= Current_Scope
;
4625 Designator
: Entity_Id
;
4627 Is_Completion
: Boolean;
4628 -- Indicates whether a null procedure declaration is a completion
4631 -- Null procedures are not allowed in SPARK
4633 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4634 and then Null_Present
(Specification
(N
))
4636 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4638 -- Null procedures are allowed in protected types, following the
4639 -- recent AI12-0147.
4641 if Is_Protected_Type
(Current_Scope
)
4642 and then Ada_Version
< Ada_2012
4644 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4647 Analyze_Null_Procedure
(N
, Is_Completion
);
4649 -- The null procedure acts as a body, nothing further is needed
4651 if Is_Completion
then
4656 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4658 -- A reference may already have been generated for the unit name, in
4659 -- which case the following call is redundant. However it is needed for
4660 -- declarations that are the rewriting of an expression function.
4662 Generate_Definition
(Designator
);
4664 -- Set the SPARK mode from the current context (may be overwritten later
4665 -- with explicit pragma). This is not done for entry barrier functions
4666 -- because they are generated outside the protected type and should not
4667 -- carry the mode of the enclosing context.
4669 if Nkind
(N
) = N_Subprogram_Declaration
4670 and then Is_Entry_Barrier_Function
(N
)
4675 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4676 Set_SPARK_Pragma_Inherited
(Designator
);
4679 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
4680 -- the body of this subprogram is instantiated or inlined later and out
4681 -- of context. The body uses this attribute to restore the value of the
4684 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4685 Set_Ignore_SPARK_Mode_Pragmas
(Designator
);
4688 -- Preserve relevant elaboration-related attributes of the context which
4689 -- are no longer available or very expensive to recompute once analysis,
4690 -- resolution, and expansion are over.
4692 Mark_Elaboration_Attributes
4693 (N_Id
=> Designator
,
4696 if Debug_Flag_C
then
4697 Write_Str
("==> subprogram spec ");
4698 Write_Name
(Chars
(Designator
));
4699 Write_Str
(" from ");
4700 Write_Location
(Sloc
(N
));
4705 Validate_RCI_Subprogram_Declaration
(N
);
4706 New_Overloaded_Entity
(Designator
);
4707 Check_Delayed_Subprogram
(Designator
);
4709 -- If the type of the first formal of the current subprogram is a non-
4710 -- generic tagged private type, mark the subprogram as being a private
4711 -- primitive. Ditto if this is a function with controlling result, and
4712 -- the return type is currently private. In both cases, the type of the
4713 -- controlling argument or result must be in the current scope for the
4714 -- operation to be primitive.
4716 if Has_Controlling_Result
(Designator
)
4717 and then Is_Private_Type
(Etype
(Designator
))
4718 and then Scope
(Etype
(Designator
)) = Current_Scope
4719 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4721 Set_Is_Private_Primitive
(Designator
);
4723 elsif Present
(First_Formal
(Designator
)) then
4725 Formal_Typ
: constant Entity_Id
:=
4726 Etype
(First_Formal
(Designator
));
4728 Set_Is_Private_Primitive
(Designator
,
4729 Is_Tagged_Type
(Formal_Typ
)
4730 and then Scope
(Formal_Typ
) = Current_Scope
4731 and then Is_Private_Type
(Formal_Typ
)
4732 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4736 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4739 if Ada_Version
>= Ada_2005
4740 and then Comes_From_Source
(N
)
4741 and then Is_Dispatching_Operation
(Designator
)
4748 if Has_Controlling_Result
(Designator
) then
4749 Etyp
:= Etype
(Designator
);
4752 E
:= First_Entity
(Designator
);
4754 and then Is_Formal
(E
)
4755 and then not Is_Controlling_Formal
(E
)
4763 if Is_Access_Type
(Etyp
) then
4764 Etyp
:= Directly_Designated_Type
(Etyp
);
4767 if Is_Interface
(Etyp
)
4768 and then not Is_Abstract_Subprogram
(Designator
)
4769 and then not (Ekind
(Designator
) = E_Procedure
4770 and then Null_Present
(Specification
(N
)))
4772 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4774 -- Specialize error message based on procedures vs. functions,
4775 -- since functions can't be null subprograms.
4777 if Ekind
(Designator
) = E_Procedure
then
4779 ("interface procedure % must be abstract or null", N
);
4782 ("interface function % must be abstract", N
);
4788 -- What is the following code for, it used to be
4790 -- ??? Set_Suppress_Elaboration_Checks
4791 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4793 -- The following seems equivalent, but a bit dubious
4795 if Elaboration_Checks_Suppressed
(Designator
) then
4796 Set_Kill_Elaboration_Checks
(Designator
);
4799 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4800 Set_Categorization_From_Scope
(Designator
, Scop
);
4803 -- For a compilation unit, check for library-unit pragmas
4805 Push_Scope
(Designator
);
4806 Set_Categorization_From_Pragmas
(N
);
4807 Validate_Categorization_Dependency
(N
, Designator
);
4811 -- For a compilation unit, set body required. This flag will only be
4812 -- reset if a valid Import or Interface pragma is processed later on.
4814 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4815 Set_Body_Required
(Parent
(N
), True);
4817 if Ada_Version
>= Ada_2005
4818 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4819 and then Null_Present
(Specification
(N
))
4822 ("null procedure cannot be declared at library level", N
);
4826 Generate_Reference_To_Formals
(Designator
);
4827 Check_Eliminated
(Designator
);
4829 if Debug_Flag_C
then
4831 Write_Str
("<== subprogram spec ");
4832 Write_Name
(Chars
(Designator
));
4833 Write_Str
(" from ");
4834 Write_Location
(Sloc
(N
));
4838 if Is_Protected_Type
(Current_Scope
) then
4840 -- Indicate that this is a protected operation, because it may be
4841 -- used in subsequent declarations within the protected type.
4843 Set_Convention
(Designator
, Convention_Protected
);
4846 List_Inherited_Pre_Post_Aspects
(Designator
);
4848 if Has_Aspects
(N
) then
4849 Analyze_Aspect_Specifications
(N
, Designator
);
4851 end Analyze_Subprogram_Declaration
;
4853 --------------------------------------
4854 -- Analyze_Subprogram_Specification --
4855 --------------------------------------
4857 -- Reminder: N here really is a subprogram specification (not a subprogram
4858 -- declaration). This procedure is called to analyze the specification in
4859 -- both subprogram bodies and subprogram declarations (specs).
4861 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4862 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean;
4863 -- Determine whether entity E denotes the spec or body of an invariant
4866 ------------------------------------
4867 -- Is_Invariant_Procedure_Or_Body --
4868 ------------------------------------
4870 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean is
4871 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
4875 if Nkind
(Decl
) = N_Subprogram_Body
then
4876 Spec
:= Corresponding_Spec
(Decl
);
4883 and then Ekind
(Spec
) = E_Procedure
4884 and then (Is_Partial_Invariant_Procedure
(Spec
)
4885 or else Is_Invariant_Procedure
(Spec
));
4886 end Is_Invariant_Procedure_Or_Body
;
4890 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4891 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4893 -- Start of processing for Analyze_Subprogram_Specification
4896 -- User-defined operator is not allowed in SPARK, except as a renaming
4898 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4899 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4901 Check_SPARK_05_Restriction
4902 ("user-defined operator is not allowed", N
);
4905 -- Proceed with analysis. Do not emit a cross-reference entry if the
4906 -- specification comes from an expression function, because it may be
4907 -- the completion of a previous declaration. It is not, the cross-
4908 -- reference entry will be emitted for the new subprogram declaration.
4910 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4911 Generate_Definition
(Designator
);
4914 if Nkind
(N
) = N_Function_Specification
then
4915 Set_Ekind
(Designator
, E_Function
);
4916 Set_Mechanism
(Designator
, Default_Mechanism
);
4918 Set_Ekind
(Designator
, E_Procedure
);
4919 Set_Etype
(Designator
, Standard_Void_Type
);
4922 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4923 -- those subprograms which could be inlined in GNATprove mode (because
4924 -- Body_To_Inline is non-Empty) but should not be inlined.
4926 if GNATprove_Mode
then
4927 Set_Is_Inlined_Always
(Designator
);
4930 -- Introduce new scope for analysis of the formals and the return type
4932 Set_Scope
(Designator
, Current_Scope
);
4934 if Present
(Formals
) then
4935 Push_Scope
(Designator
);
4936 Process_Formals
(Formals
, N
);
4938 -- Check dimensions in N for formals with default expression
4940 Analyze_Dimension_Formals
(N
, Formals
);
4942 -- Ada 2005 (AI-345): If this is an overriding operation of an
4943 -- inherited interface operation, and the controlling type is
4944 -- a synchronized type, replace the type with its corresponding
4945 -- record, to match the proper signature of an overriding operation.
4946 -- Same processing for an access parameter whose designated type is
4947 -- derived from a synchronized interface.
4949 -- This modification is not done for invariant procedures because
4950 -- the corresponding record may not necessarely be visible when the
4951 -- concurrent type acts as the full view of a private type.
4954 -- type Prot is private with Type_Invariant => ...;
4955 -- procedure ConcInvariant (Obj : Prot);
4957 -- protected type Prot is ...;
4958 -- type Concurrent_Record_Prot is record ...;
4959 -- procedure ConcInvariant (Obj : Prot) is
4961 -- end ConcInvariant;
4964 -- In the example above, both the spec and body of the invariant
4965 -- procedure must utilize the private type as the controlling type.
4967 if Ada_Version
>= Ada_2005
4968 and then not Is_Invariant_Procedure_Or_Body
(Designator
)
4972 Formal_Typ
: Entity_Id
;
4973 Rec_Typ
: Entity_Id
;
4974 Desig_Typ
: Entity_Id
;
4977 Formal
:= First_Formal
(Designator
);
4978 while Present
(Formal
) loop
4979 Formal_Typ
:= Etype
(Formal
);
4981 if Is_Concurrent_Type
(Formal_Typ
)
4982 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4984 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4986 if Present
(Interfaces
(Rec_Typ
)) then
4987 Set_Etype
(Formal
, Rec_Typ
);
4990 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4991 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4993 if Is_Concurrent_Type
(Desig_Typ
)
4994 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4996 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4998 if Present
(Interfaces
(Rec_Typ
)) then
4999 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
5004 Next_Formal
(Formal
);
5011 -- The subprogram scope is pushed and popped around the processing of
5012 -- the return type for consistency with call above to Process_Formals
5013 -- (which itself can call Analyze_Return_Type), and to ensure that any
5014 -- itype created for the return type will be associated with the proper
5017 elsif Nkind
(N
) = N_Function_Specification
then
5018 Push_Scope
(Designator
);
5019 Analyze_Return_Type
(N
);
5025 if Nkind
(N
) = N_Function_Specification
then
5027 -- Deal with operator symbol case
5029 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
5030 Valid_Operator_Definition
(Designator
);
5033 May_Need_Actuals
(Designator
);
5035 -- Ada 2005 (AI-251): If the return type is abstract, verify that
5036 -- the subprogram is abstract also. This does not apply to renaming
5037 -- declarations, where abstractness is inherited, and to subprogram
5038 -- bodies generated for stream operations, which become renamings as
5041 -- In case of primitives associated with abstract interface types
5042 -- the check is applied later (see Analyze_Subprogram_Declaration).
5044 if not Nkind_In
(Original_Node
(Parent
(N
)),
5045 N_Abstract_Subprogram_Declaration
,
5046 N_Formal_Abstract_Subprogram_Declaration
,
5047 N_Subprogram_Renaming_Declaration
)
5049 if Is_Abstract_Type
(Etype
(Designator
))
5050 and then not Is_Interface
(Etype
(Designator
))
5053 ("function that returns abstract type must be abstract", N
);
5055 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
5056 -- access result whose designated type is abstract.
5058 elsif Ada_Version
>= Ada_2012
5059 and then Nkind
(Result_Definition
(N
)) = N_Access_Definition
5061 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
5062 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
5065 ("function whose access result designates abstract type "
5066 & "must be abstract", N
);
5072 end Analyze_Subprogram_Specification
;
5074 -----------------------
5075 -- Check_Conformance --
5076 -----------------------
5078 procedure Check_Conformance
5079 (New_Id
: Entity_Id
;
5081 Ctype
: Conformance_Type
;
5083 Conforms
: out Boolean;
5084 Err_Loc
: Node_Id
:= Empty
;
5085 Get_Inst
: Boolean := False;
5086 Skip_Controlling_Formals
: Boolean := False)
5088 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
5089 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
5090 -- If Errmsg is True, then processing continues to post an error message
5091 -- for conformance error on given node. Two messages are output. The
5092 -- first message points to the previous declaration with a general "no
5093 -- conformance" message. The second is the detailed reason, supplied as
5094 -- Msg. The parameter N provide information for a possible & insertion
5095 -- in the message, and also provides the location for posting the
5096 -- message in the absence of a specified Err_Loc location.
5098 function Conventions_Match
5100 Id2
: Entity_Id
) return Boolean;
5101 -- Determine whether the conventions of arbitrary entities Id1 and Id2
5104 -----------------------
5105 -- Conformance_Error --
5106 -----------------------
5108 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
5115 if No
(Err_Loc
) then
5121 Error_Msg_Sloc
:= Sloc
(Old_Id
);
5124 when Type_Conformant
=>
5125 Error_Msg_N
-- CODEFIX
5126 ("not type conformant with declaration#!", Enode
);
5128 when Mode_Conformant
=>
5129 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5131 ("not mode conformant with operation inherited#!",
5135 ("not mode conformant with declaration#!", Enode
);
5138 when Subtype_Conformant
=>
5139 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5141 ("not subtype conformant with operation inherited#!",
5145 ("not subtype conformant with declaration#!", Enode
);
5148 when Fully_Conformant
=>
5149 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5150 Error_Msg_N
-- CODEFIX
5151 ("not fully conformant with operation inherited#!",
5154 Error_Msg_N
-- CODEFIX
5155 ("not fully conformant with declaration#!", Enode
);
5159 Error_Msg_NE
(Msg
, Enode
, N
);
5161 end Conformance_Error
;
5163 -----------------------
5164 -- Conventions_Match --
5165 -----------------------
5167 function Conventions_Match
5169 Id2
: Entity_Id
) return Boolean
5172 -- Ignore the conventions of anonymous access-to-subprogram types
5173 -- and subprogram types because these are internally generated and
5174 -- the only way these may receive a convention is if they inherit
5175 -- the convention of a related subprogram.
5177 if Ekind_In
(Id1
, E_Anonymous_Access_Subprogram_Type
,
5180 Ekind_In
(Id2
, E_Anonymous_Access_Subprogram_Type
,
5185 -- Otherwise compare the conventions directly
5188 return Convention
(Id1
) = Convention
(Id2
);
5190 end Conventions_Match
;
5194 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
5195 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
5196 Old_Formal
: Entity_Id
;
5197 New_Formal
: Entity_Id
;
5198 Access_Types_Match
: Boolean;
5199 Old_Formal_Base
: Entity_Id
;
5200 New_Formal_Base
: Entity_Id
;
5202 -- Start of processing for Check_Conformance
5207 -- We need a special case for operators, since they don't appear
5210 if Ctype
= Type_Conformant
then
5211 if Ekind
(New_Id
) = E_Operator
5212 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
5218 -- If both are functions/operators, check return types conform
5220 if Old_Type
/= Standard_Void_Type
5222 New_Type
/= Standard_Void_Type
5224 -- If we are checking interface conformance we omit controlling
5225 -- arguments and result, because we are only checking the conformance
5226 -- of the remaining parameters.
5228 if Has_Controlling_Result
(Old_Id
)
5229 and then Has_Controlling_Result
(New_Id
)
5230 and then Skip_Controlling_Formals
5234 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
5235 if Ctype
>= Subtype_Conformant
5236 and then not Predicates_Match
(Old_Type
, New_Type
)
5239 ("\predicate of return type does not match!", New_Id
);
5242 ("\return type does not match!", New_Id
);
5248 -- Ada 2005 (AI-231): In case of anonymous access types check the
5249 -- null-exclusion and access-to-constant attributes match.
5251 if Ada_Version
>= Ada_2005
5252 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
5254 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
5255 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
5256 Is_Access_Constant
(Etype
(New_Type
)))
5258 Conformance_Error
("\return type does not match!", New_Id
);
5262 -- If either is a function/operator and the other isn't, error
5264 elsif Old_Type
/= Standard_Void_Type
5265 or else New_Type
/= Standard_Void_Type
5267 Conformance_Error
("\functions can only match functions!", New_Id
);
5271 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
5272 -- If this is a renaming as body, refine error message to indicate that
5273 -- the conflict is with the original declaration. If the entity is not
5274 -- frozen, the conventions don't have to match, the one of the renamed
5275 -- entity is inherited.
5277 if Ctype
>= Subtype_Conformant
then
5278 if not Conventions_Match
(Old_Id
, New_Id
) then
5279 if not Is_Frozen
(New_Id
) then
5282 elsif Present
(Err_Loc
)
5283 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
5284 and then Present
(Corresponding_Spec
(Err_Loc
))
5286 Error_Msg_Name_1
:= Chars
(New_Id
);
5288 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
5289 Conformance_Error
("\prior declaration for% has convention %!");
5292 Conformance_Error
("\calling conventions do not match!");
5297 elsif Is_Formal_Subprogram
(Old_Id
)
5298 or else Is_Formal_Subprogram
(New_Id
)
5300 Conformance_Error
("\formal subprograms not allowed!");
5305 -- Deal with parameters
5307 -- Note: we use the entity information, rather than going directly
5308 -- to the specification in the tree. This is not only simpler, but
5309 -- absolutely necessary for some cases of conformance tests between
5310 -- operators, where the declaration tree simply does not exist.
5312 Old_Formal
:= First_Formal
(Old_Id
);
5313 New_Formal
:= First_Formal
(New_Id
);
5314 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
5315 if Is_Controlling_Formal
(Old_Formal
)
5316 and then Is_Controlling_Formal
(New_Formal
)
5317 and then Skip_Controlling_Formals
5319 -- The controlling formals will have different types when
5320 -- comparing an interface operation with its match, but both
5321 -- or neither must be access parameters.
5323 if Is_Access_Type
(Etype
(Old_Formal
))
5325 Is_Access_Type
(Etype
(New_Formal
))
5327 goto Skip_Controlling_Formal
;
5330 ("\access parameter does not match!", New_Formal
);
5334 -- Ada 2012: Mode conformance also requires that formal parameters
5335 -- be both aliased, or neither.
5337 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
5338 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
5340 ("\aliased parameter mismatch!", New_Formal
);
5344 if Ctype
= Fully_Conformant
then
5346 -- Names must match. Error message is more accurate if we do
5347 -- this before checking that the types of the formals match.
5349 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
5350 Conformance_Error
("\name& does not match!", New_Formal
);
5352 -- Set error posted flag on new formal as well to stop
5353 -- junk cascaded messages in some cases.
5355 Set_Error_Posted
(New_Formal
);
5359 -- Null exclusion must match
5361 if Null_Exclusion_Present
(Parent
(Old_Formal
))
5363 Null_Exclusion_Present
(Parent
(New_Formal
))
5365 -- Only give error if both come from source. This should be
5366 -- investigated some time, since it should not be needed ???
5368 if Comes_From_Source
(Old_Formal
)
5370 Comes_From_Source
(New_Formal
)
5373 ("\null exclusion for& does not match", New_Formal
);
5375 -- Mark error posted on the new formal to avoid duplicated
5376 -- complaint about types not matching.
5378 Set_Error_Posted
(New_Formal
);
5383 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
5384 -- case occurs whenever a subprogram is being renamed and one of its
5385 -- parameters imposes a null exclusion. For example:
5387 -- type T is null record;
5388 -- type Acc_T is access T;
5389 -- subtype Acc_T_Sub is Acc_T;
5391 -- procedure P (Obj : not null Acc_T_Sub); -- itype
5392 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
5395 Old_Formal_Base
:= Etype
(Old_Formal
);
5396 New_Formal_Base
:= Etype
(New_Formal
);
5399 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
5400 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
5403 Access_Types_Match
:= Ada_Version
>= Ada_2005
5405 -- Ensure that this rule is only applied when New_Id is a
5406 -- renaming of Old_Id.
5408 and then Nkind
(Parent
(Parent
(New_Id
))) =
5409 N_Subprogram_Renaming_Declaration
5410 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
5411 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
5412 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
5414 -- Now handle the allowed access-type case
5416 and then Is_Access_Type
(Old_Formal_Base
)
5417 and then Is_Access_Type
(New_Formal_Base
)
5419 -- The type kinds must match. The only exception occurs with
5420 -- multiple generics of the form:
5423 -- type F is private; type A is private;
5424 -- type F_Ptr is access F; type A_Ptr is access A;
5425 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
5426 -- package F_Pack is ... package A_Pack is
5427 -- package F_Inst is
5428 -- new F_Pack (A, A_Ptr, A_P);
5430 -- When checking for conformance between the parameters of A_P
5431 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
5432 -- because the compiler has transformed A_Ptr into a subtype of
5433 -- F_Ptr. We catch this case in the code below.
5435 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
5437 (Is_Generic_Type
(Old_Formal_Base
)
5438 and then Is_Generic_Type
(New_Formal_Base
)
5439 and then Is_Internal
(New_Formal_Base
)
5440 and then Etype
(Etype
(New_Formal_Base
)) =
5442 and then Directly_Designated_Type
(Old_Formal_Base
) =
5443 Directly_Designated_Type
(New_Formal_Base
)
5444 and then ((Is_Itype
(Old_Formal_Base
)
5445 and then Can_Never_Be_Null
(Old_Formal_Base
))
5447 (Is_Itype
(New_Formal_Base
)
5448 and then Can_Never_Be_Null
(New_Formal_Base
)));
5450 -- Types must always match. In the visible part of an instance,
5451 -- usual overloading rules for dispatching operations apply, and
5452 -- we check base types (not the actual subtypes).
5454 if In_Instance_Visible_Part
5455 and then Is_Dispatching_Operation
(New_Id
)
5457 if not Conforming_Types
5458 (T1
=> Base_Type
(Etype
(Old_Formal
)),
5459 T2
=> Base_Type
(Etype
(New_Formal
)),
5461 Get_Inst
=> Get_Inst
)
5462 and then not Access_Types_Match
5464 Conformance_Error
("\type of & does not match!", New_Formal
);
5468 elsif not Conforming_Types
5469 (T1
=> Old_Formal_Base
,
5470 T2
=> New_Formal_Base
,
5472 Get_Inst
=> Get_Inst
)
5473 and then not Access_Types_Match
5475 -- Don't give error message if old type is Any_Type. This test
5476 -- avoids some cascaded errors, e.g. in case of a bad spec.
5478 if Errmsg
and then Old_Formal_Base
= Any_Type
then
5481 if Ctype
>= Subtype_Conformant
5483 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
5486 ("\predicate of & does not match!", New_Formal
);
5489 ("\type of & does not match!", New_Formal
);
5491 if not Dimensions_Match
(Old_Formal_Base
, New_Formal_Base
)
5493 Error_Msg_N
("\dimensions mismatch!", New_Formal
);
5501 -- For mode conformance, mode must match
5503 if Ctype
>= Mode_Conformant
then
5504 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
5505 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
5506 or else not Is_Primitive_Wrapper
(New_Id
)
5508 Conformance_Error
("\mode of & does not match!", New_Formal
);
5512 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
5514 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
5516 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
5519 ("\mode of & does not match!", New_Formal
);
5526 -- Part of mode conformance for access types is having the same
5527 -- constant modifier.
5529 elsif Access_Types_Match
5530 and then Is_Access_Constant
(Old_Formal_Base
) /=
5531 Is_Access_Constant
(New_Formal_Base
)
5534 ("\constant modifier does not match!", New_Formal
);
5539 if Ctype
>= Subtype_Conformant
then
5541 -- Ada 2005 (AI-231): In case of anonymous access types check
5542 -- the null-exclusion and access-to-constant attributes must
5543 -- match. For null exclusion, we test the types rather than the
5544 -- formals themselves, since the attribute is only set reliably
5545 -- on the formals in the Ada 95 case, and we exclude the case
5546 -- where Old_Formal is marked as controlling, to avoid errors
5547 -- when matching completing bodies with dispatching declarations
5548 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
5550 if Ada_Version
>= Ada_2005
5551 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
5552 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
5554 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
5555 Can_Never_Be_Null
(Etype
(New_Formal
))
5557 not Is_Controlling_Formal
(Old_Formal
))
5559 Is_Access_Constant
(Etype
(Old_Formal
)) /=
5560 Is_Access_Constant
(Etype
(New_Formal
)))
5562 -- Do not complain if error already posted on New_Formal. This
5563 -- avoids some redundant error messages.
5565 and then not Error_Posted
(New_Formal
)
5567 -- It is allowed to omit the null-exclusion in case of stream
5568 -- attribute subprograms. We recognize stream subprograms
5569 -- through their TSS-generated suffix.
5572 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
5575 if TSS_Name
/= TSS_Stream_Read
5576 and then TSS_Name
/= TSS_Stream_Write
5577 and then TSS_Name
/= TSS_Stream_Input
5578 and then TSS_Name
/= TSS_Stream_Output
5580 -- Here we have a definite conformance error. It is worth
5581 -- special casing the error message for the case of a
5582 -- controlling formal (which excludes null).
5584 if Is_Controlling_Formal
(New_Formal
) then
5585 Error_Msg_Node_2
:= Scope
(New_Formal
);
5587 ("\controlling formal & of & excludes null, "
5588 & "declaration must exclude null as well",
5591 -- Normal case (couldn't we give more detail here???)
5595 ("\type of & does not match!", New_Formal
);
5604 -- Full conformance checks
5606 if Ctype
= Fully_Conformant
then
5608 -- We have checked already that names match
5610 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
5612 -- Check default expressions for in parameters
5615 NewD
: constant Boolean :=
5616 Present
(Default_Value
(New_Formal
));
5617 OldD
: constant Boolean :=
5618 Present
(Default_Value
(Old_Formal
));
5620 if NewD
or OldD
then
5622 -- The old default value has been analyzed because the
5623 -- current full declaration will have frozen everything
5624 -- before. The new default value has not been analyzed,
5625 -- so analyze it now before we check for conformance.
5628 Push_Scope
(New_Id
);
5629 Preanalyze_Spec_Expression
5630 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5634 if not (NewD
and OldD
)
5635 or else not Fully_Conformant_Expressions
5636 (Default_Value
(Old_Formal
),
5637 Default_Value
(New_Formal
))
5640 ("\default expression for & does not match!",
5649 -- A couple of special checks for Ada 83 mode. These checks are
5650 -- skipped if either entity is an operator in package Standard,
5651 -- or if either old or new instance is not from the source program.
5653 if Ada_Version
= Ada_83
5654 and then Sloc
(Old_Id
) > Standard_Location
5655 and then Sloc
(New_Id
) > Standard_Location
5656 and then Comes_From_Source
(Old_Id
)
5657 and then Comes_From_Source
(New_Id
)
5660 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5661 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5664 -- Explicit IN must be present or absent in both cases. This
5665 -- test is required only in the full conformance case.
5667 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5668 and then Ctype
= Fully_Conformant
5671 ("\(Ada 83) IN must appear in both declarations",
5676 -- Grouping (use of comma in param lists) must be the same
5677 -- This is where we catch a misconformance like:
5680 -- A : Integer; B : Integer
5682 -- which are represented identically in the tree except
5683 -- for the setting of the flags More_Ids and Prev_Ids.
5685 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5686 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5689 ("\grouping of & does not match!", New_Formal
);
5695 -- This label is required when skipping controlling formals
5697 <<Skip_Controlling_Formal
>>
5699 Next_Formal
(Old_Formal
);
5700 Next_Formal
(New_Formal
);
5703 if Present
(Old_Formal
) then
5704 Conformance_Error
("\too few parameters!");
5707 elsif Present
(New_Formal
) then
5708 Conformance_Error
("\too many parameters!", New_Formal
);
5711 end Check_Conformance
;
5713 -----------------------
5714 -- Check_Conventions --
5715 -----------------------
5717 procedure Check_Conventions
(Typ
: Entity_Id
) is
5718 Ifaces_List
: Elist_Id
;
5720 procedure Check_Convention
(Op
: Entity_Id
);
5721 -- Verify that the convention of inherited dispatching operation Op is
5722 -- consistent among all subprograms it overrides. In order to minimize
5723 -- the search, Search_From is utilized to designate a specific point in
5724 -- the list rather than iterating over the whole list once more.
5726 ----------------------
5727 -- Check_Convention --
5728 ----------------------
5730 procedure Check_Convention
(Op
: Entity_Id
) is
5731 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5732 Iface_Conv
: Convention_Id
;
5733 Iface_Elmt
: Elmt_Id
;
5734 Iface_Prim_Elmt
: Elmt_Id
;
5735 Iface_Prim
: Entity_Id
;
5738 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5739 while Present
(Iface_Elmt
) loop
5741 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5742 while Present
(Iface_Prim_Elmt
) loop
5743 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5744 Iface_Conv
:= Convention
(Iface_Prim
);
5746 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5747 and then Iface_Conv
/= Op_Conv
5750 ("inconsistent conventions in primitive operations", Typ
);
5752 Error_Msg_Name_1
:= Chars
(Op
);
5753 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5754 Error_Msg_Sloc
:= Sloc
(Op
);
5756 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5757 if not Present
(Overridden_Operation
(Op
)) then
5758 Error_Msg_N
("\\primitive % defined #", Typ
);
5761 ("\\overriding operation % with "
5762 & "convention % defined #", Typ
);
5765 else pragma Assert
(Present
(Alias
(Op
)));
5766 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5767 Error_Msg_N
("\\inherited operation % with "
5768 & "convention % defined #", Typ
);
5771 Error_Msg_Name_1
:= Chars
(Op
);
5772 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5773 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5774 Error_Msg_N
("\\overridden operation % with "
5775 & "convention % defined #", Typ
);
5777 -- Avoid cascading errors
5782 Next_Elmt
(Iface_Prim_Elmt
);
5785 Next_Elmt
(Iface_Elmt
);
5787 end Check_Convention
;
5791 Prim_Op
: Entity_Id
;
5792 Prim_Op_Elmt
: Elmt_Id
;
5794 -- Start of processing for Check_Conventions
5797 if not Has_Interfaces
(Typ
) then
5801 Collect_Interfaces
(Typ
, Ifaces_List
);
5803 -- The algorithm checks every overriding dispatching operation against
5804 -- all the corresponding overridden dispatching operations, detecting
5805 -- differences in conventions.
5807 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5808 while Present
(Prim_Op_Elmt
) loop
5809 Prim_Op
:= Node
(Prim_Op_Elmt
);
5811 -- A small optimization: skip the predefined dispatching operations
5812 -- since they always have the same convention.
5814 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5815 Check_Convention
(Prim_Op
);
5818 Next_Elmt
(Prim_Op_Elmt
);
5820 end Check_Conventions
;
5822 ------------------------------
5823 -- Check_Delayed_Subprogram --
5824 ------------------------------
5826 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5829 procedure Possible_Freeze
(T
: Entity_Id
);
5830 -- T is the type of either a formal parameter or of the return type.
5831 -- If T is not yet frozen and needs a delayed freeze, then the
5832 -- subprogram itself must be delayed.
5834 ---------------------
5835 -- Possible_Freeze --
5836 ---------------------
5838 procedure Possible_Freeze
(T
: Entity_Id
) is
5840 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5841 Set_Has_Delayed_Freeze
(Designator
);
5843 elsif Is_Access_Type
(T
)
5844 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5845 and then not Is_Frozen
(Designated_Type
(T
))
5847 Set_Has_Delayed_Freeze
(Designator
);
5850 end Possible_Freeze
;
5852 -- Start of processing for Check_Delayed_Subprogram
5855 -- All subprograms, including abstract subprograms, may need a freeze
5856 -- node if some formal type or the return type needs one.
5858 Possible_Freeze
(Etype
(Designator
));
5859 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5861 -- Need delayed freeze if any of the formal types themselves need
5862 -- a delayed freeze and are not yet frozen.
5864 F
:= First_Formal
(Designator
);
5865 while Present
(F
) loop
5866 Possible_Freeze
(Etype
(F
));
5867 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5871 -- Mark functions that return by reference. Note that it cannot be
5872 -- done for delayed_freeze subprograms because the underlying
5873 -- returned type may not be known yet (for private types)
5875 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5877 Typ
: constant Entity_Id
:= Etype
(Designator
);
5878 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5880 if Is_Limited_View
(Typ
) then
5881 Set_Returns_By_Ref
(Designator
);
5882 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5883 Set_Returns_By_Ref
(Designator
);
5887 end Check_Delayed_Subprogram
;
5889 ------------------------------------
5890 -- Check_Discriminant_Conformance --
5891 ------------------------------------
5893 procedure Check_Discriminant_Conformance
5898 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5899 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5900 New_Discr_Id
: Entity_Id
;
5901 New_Discr_Type
: Entity_Id
;
5903 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5904 -- Post error message for conformance error on given node. Two messages
5905 -- are output. The first points to the previous declaration with a
5906 -- general "no conformance" message. The second is the detailed reason,
5907 -- supplied as Msg. The parameter N provide information for a possible
5908 -- & insertion in the message.
5910 -----------------------
5911 -- Conformance_Error --
5912 -----------------------
5914 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5916 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5917 Error_Msg_N
-- CODEFIX
5918 ("not fully conformant with declaration#!", N
);
5919 Error_Msg_NE
(Msg
, N
, N
);
5920 end Conformance_Error
;
5922 -- Start of processing for Check_Discriminant_Conformance
5925 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5926 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5928 -- The subtype mark of the discriminant on the full type has not
5929 -- been analyzed so we do it here. For an access discriminant a new
5932 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5934 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5937 Analyze
(Discriminant_Type
(New_Discr
));
5938 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5940 -- Ada 2005: if the discriminant definition carries a null
5941 -- exclusion, create an itype to check properly for consistency
5942 -- with partial declaration.
5944 if Is_Access_Type
(New_Discr_Type
)
5945 and then Null_Exclusion_Present
(New_Discr
)
5948 Create_Null_Excluding_Itype
5949 (T
=> New_Discr_Type
,
5950 Related_Nod
=> New_Discr
,
5951 Scope_Id
=> Current_Scope
);
5955 if not Conforming_Types
5956 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5958 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5961 -- Treat the new discriminant as an occurrence of the old one,
5962 -- for navigation purposes, and fill in some semantic
5963 -- information, for completeness.
5965 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5966 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5967 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5972 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5973 Conformance_Error
("name & does not match!", New_Discr_Id
);
5977 -- Default expressions must match
5980 NewD
: constant Boolean :=
5981 Present
(Expression
(New_Discr
));
5982 OldD
: constant Boolean :=
5983 Present
(Expression
(Parent
(Old_Discr
)));
5986 if NewD
or OldD
then
5988 -- The old default value has been analyzed and expanded,
5989 -- because the current full declaration will have frozen
5990 -- everything before. The new default values have not been
5991 -- expanded, so expand now to check conformance.
5994 Preanalyze_Spec_Expression
5995 (Expression
(New_Discr
), New_Discr_Type
);
5998 if not (NewD
and OldD
)
5999 or else not Fully_Conformant_Expressions
6000 (Expression
(Parent
(Old_Discr
)),
6001 Expression
(New_Discr
))
6005 ("default expression for & does not match!",
6012 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
6014 if Ada_Version
= Ada_83
then
6016 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
6019 -- Grouping (use of comma in param lists) must be the same
6020 -- This is where we catch a misconformance like:
6023 -- A : Integer; B : Integer
6025 -- which are represented identically in the tree except
6026 -- for the setting of the flags More_Ids and Prev_Ids.
6028 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
6029 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
6032 ("grouping of & does not match!", New_Discr_Id
);
6038 Next_Discriminant
(Old_Discr
);
6042 if Present
(Old_Discr
) then
6043 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
6046 elsif Present
(New_Discr
) then
6048 ("too many discriminants!", Defining_Identifier
(New_Discr
));
6051 end Check_Discriminant_Conformance
;
6053 ----------------------------
6054 -- Check_Fully_Conformant --
6055 ----------------------------
6057 procedure Check_Fully_Conformant
6058 (New_Id
: Entity_Id
;
6060 Err_Loc
: Node_Id
:= Empty
)
6063 pragma Warnings
(Off
, Result
);
6066 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
6067 end Check_Fully_Conformant
;
6069 --------------------------
6070 -- Check_Limited_Return --
6071 --------------------------
6073 procedure Check_Limited_Return
6079 -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and
6080 -- replaced by anonymous access results. This is an incompatibility with
6081 -- Ada 95. Not clear whether this should be enforced yet or perhaps
6082 -- controllable with special switch. ???
6084 -- A limited interface that is not immutably limited is OK
6086 if Is_Limited_Interface
(R_Type
)
6088 not (Is_Task_Interface
(R_Type
)
6089 or else Is_Protected_Interface
(R_Type
)
6090 or else Is_Synchronized_Interface
(R_Type
))
6094 elsif Is_Limited_Type
(R_Type
)
6095 and then not Is_Interface
(R_Type
)
6096 and then Comes_From_Source
(N
)
6097 and then not In_Instance_Body
6098 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
6100 -- Error in Ada 2005
6102 if Ada_Version
>= Ada_2005
6103 and then not Debug_Flag_Dot_L
6104 and then not GNAT_Mode
6107 ("(Ada 2005) cannot copy object of a limited type "
6108 & "(RM-2005 6.5(5.5/2))", Expr
);
6110 if Is_Limited_View
(R_Type
) then
6112 ("\return by reference not permitted in Ada 2005", Expr
);
6115 -- Warn in Ada 95 mode, to give folks a heads up about this
6118 -- In GNAT mode, this is just a warning, to allow it to be evilly
6119 -- turned off. Otherwise it is a real error.
6121 -- In a generic context, simplify the warning because it makes no
6122 -- sense to discuss pass-by-reference or copy.
6124 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
6125 if Inside_A_Generic
then
6127 ("return of limited object not permitted in Ada 2005 "
6128 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6130 elsif Is_Limited_View
(R_Type
) then
6132 ("return by reference not permitted in Ada 2005 "
6133 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6136 ("cannot copy object of a limited type in Ada 2005 "
6137 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6140 -- Ada 95 mode, and compatibility warnings disabled
6143 pragma Assert
(Ada_Version
<= Ada_95
);
6144 pragma Assert
(not (Warn_On_Ada_2005_Compatibility
or GNAT_Mode
));
6145 return; -- skip continuation messages below
6148 if not Inside_A_Generic
then
6150 ("\consider switching to return of access type", Expr
);
6151 Explain_Limited_Type
(R_Type
, Expr
);
6154 end Check_Limited_Return
;
6156 ---------------------------
6157 -- Check_Mode_Conformant --
6158 ---------------------------
6160 procedure Check_Mode_Conformant
6161 (New_Id
: Entity_Id
;
6163 Err_Loc
: Node_Id
:= Empty
;
6164 Get_Inst
: Boolean := False)
6167 pragma Warnings
(Off
, Result
);
6170 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
6171 end Check_Mode_Conformant
;
6173 --------------------------------
6174 -- Check_Overriding_Indicator --
6175 --------------------------------
6177 procedure Check_Overriding_Indicator
6179 Overridden_Subp
: Entity_Id
;
6180 Is_Primitive
: Boolean)
6186 -- No overriding indicator for literals
6188 if Ekind
(Subp
) = E_Enumeration_Literal
then
6191 elsif Ekind
(Subp
) = E_Entry
then
6192 Decl
:= Parent
(Subp
);
6194 -- No point in analyzing a malformed operator
6196 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
6197 and then Error_Posted
(Subp
)
6202 Decl
:= Unit_Declaration_Node
(Subp
);
6205 if Nkind_In
(Decl
, N_Subprogram_Body
,
6206 N_Subprogram_Body_Stub
,
6207 N_Subprogram_Declaration
,
6208 N_Abstract_Subprogram_Declaration
,
6209 N_Subprogram_Renaming_Declaration
)
6211 Spec
:= Specification
(Decl
);
6213 elsif Nkind
(Decl
) = N_Entry_Declaration
then
6220 -- The overriding operation is type conformant with the overridden one,
6221 -- but the names of the formals are not required to match. If the names
6222 -- appear permuted in the overriding operation, this is a possible
6223 -- source of confusion that is worth diagnosing. Controlling formals
6224 -- often carry names that reflect the type, and it is not worthwhile
6225 -- requiring that their names match.
6227 if Present
(Overridden_Subp
)
6228 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
6235 Form1
:= First_Formal
(Subp
);
6236 Form2
:= First_Formal
(Overridden_Subp
);
6238 -- If the overriding operation is a synchronized operation, skip
6239 -- the first parameter of the overridden operation, which is
6240 -- implicit in the new one. If the operation is declared in the
6241 -- body it is not primitive and all formals must match.
6243 if Is_Concurrent_Type
(Scope
(Subp
))
6244 and then Is_Tagged_Type
(Scope
(Subp
))
6245 and then not Has_Completion
(Scope
(Subp
))
6247 Form2
:= Next_Formal
(Form2
);
6250 if Present
(Form1
) then
6251 Form1
:= Next_Formal
(Form1
);
6252 Form2
:= Next_Formal
(Form2
);
6255 while Present
(Form1
) loop
6256 if not Is_Controlling_Formal
(Form1
)
6257 and then Present
(Next_Formal
(Form2
))
6258 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
6260 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
6261 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
6263 ("& does not match corresponding formal of&#",
6268 Next_Formal
(Form1
);
6269 Next_Formal
(Form2
);
6274 -- If there is an overridden subprogram, then check that there is no
6275 -- "not overriding" indicator, and mark the subprogram as overriding.
6276 -- This is not done if the overridden subprogram is marked as hidden,
6277 -- which can occur for the case of inherited controlled operations
6278 -- (see Derive_Subprogram), unless the inherited subprogram's parent
6279 -- subprogram is not itself hidden. (Note: This condition could probably
6280 -- be simplified, leaving out the testing for the specific controlled
6281 -- cases, but it seems safer and clearer this way, and echoes similar
6282 -- special-case tests of this kind in other places.)
6284 if Present
(Overridden_Subp
)
6285 and then (not Is_Hidden
(Overridden_Subp
)
6287 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
6290 and then Present
(Alias
(Overridden_Subp
))
6291 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
6293 if Must_Not_Override
(Spec
) then
6294 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
6296 if Ekind
(Subp
) = E_Entry
then
6298 ("entry & overrides inherited operation #", Spec
, Subp
);
6301 ("subprogram & overrides inherited operation #", Spec
, Subp
);
6304 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
6305 -- as an extension of Root_Controlled, and thus has a useless Adjust
6306 -- operation. This operation should not be inherited by other limited
6307 -- controlled types. An explicit Adjust for them is not overriding.
6309 elsif Must_Override
(Spec
)
6310 and then Chars
(Overridden_Subp
) = Name_Adjust
6311 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
6312 and then Present
(Alias
(Overridden_Subp
))
6313 and then In_Predefined_Unit
(Alias
(Overridden_Subp
))
6316 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))));
6317 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6319 elsif Is_Subprogram
(Subp
) then
6320 if Is_Init_Proc
(Subp
) then
6323 elsif No
(Overridden_Operation
(Subp
)) then
6325 -- For entities generated by Derive_Subprograms the overridden
6326 -- operation is the inherited primitive (which is available
6327 -- through the attribute alias)
6329 if (Is_Dispatching_Operation
(Subp
)
6330 or else Is_Dispatching_Operation
(Overridden_Subp
))
6331 and then not Comes_From_Source
(Overridden_Subp
)
6332 and then Find_Dispatching_Type
(Overridden_Subp
) =
6333 Find_Dispatching_Type
(Subp
)
6334 and then Present
(Alias
(Overridden_Subp
))
6335 and then Comes_From_Source
(Alias
(Overridden_Subp
))
6337 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
6338 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
6341 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
6342 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
6347 -- If primitive flag is set or this is a protected operation, then
6348 -- the operation is overriding at the point of its declaration, so
6349 -- warn if necessary. Otherwise it may have been declared before the
6350 -- operation it overrides and no check is required.
6353 and then not Must_Override
(Spec
)
6354 and then (Is_Primitive
6355 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
6357 Style
.Missing_Overriding
(Decl
, Subp
);
6360 -- If Subp is an operator, it may override a predefined operation, if
6361 -- it is defined in the same scope as the type to which it applies.
6362 -- In that case Overridden_Subp is empty because of our implicit
6363 -- representation for predefined operators. We have to check whether the
6364 -- signature of Subp matches that of a predefined operator. Note that
6365 -- first argument provides the name of the operator, and the second
6366 -- argument the signature that may match that of a standard operation.
6367 -- If the indicator is overriding, then the operator must match a
6368 -- predefined signature, because we know already that there is no
6369 -- explicit overridden operation.
6371 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
6372 if Must_Not_Override
(Spec
) then
6374 -- If this is not a primitive or a protected subprogram, then
6375 -- "not overriding" is illegal.
6378 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6380 Error_Msg_N
("overriding indicator only allowed "
6381 & "if subprogram is primitive", Subp
);
6383 elsif Can_Override_Operator
(Subp
) then
6385 ("subprogram& overrides predefined operator ", Spec
, Subp
);
6388 elsif Must_Override
(Spec
) then
6389 if No
(Overridden_Operation
(Subp
))
6390 and then not Can_Override_Operator
(Subp
)
6392 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6395 elsif not Error_Posted
(Subp
)
6396 and then Style_Check
6397 and then Can_Override_Operator
(Subp
)
6398 and then not In_Predefined_Unit
(Subp
)
6400 -- If style checks are enabled, indicate that the indicator is
6401 -- missing. However, at the point of declaration, the type of
6402 -- which this is a primitive operation may be private, in which
6403 -- case the indicator would be premature.
6405 if Has_Private_Declaration
(Etype
(Subp
))
6406 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
6410 Style
.Missing_Overriding
(Decl
, Subp
);
6414 elsif Must_Override
(Spec
) then
6415 if Ekind
(Subp
) = E_Entry
then
6416 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
6418 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6421 -- If the operation is marked "not overriding" and it's not primitive
6422 -- then an error is issued, unless this is an operation of a task or
6423 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
6424 -- has been specified have already been checked above.
6426 elsif Must_Not_Override
(Spec
)
6427 and then not Is_Primitive
6428 and then Ekind
(Subp
) /= E_Entry
6429 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6432 ("overriding indicator only allowed if subprogram is primitive",
6436 end Check_Overriding_Indicator
;
6442 -- Note: this procedure needs to know far too much about how the expander
6443 -- messes with exceptions. The use of the flag Exception_Junk and the
6444 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
6445 -- works, but is not very clean. It would be better if the expansion
6446 -- routines would leave Original_Node working nicely, and we could use
6447 -- Original_Node here to ignore all the peculiar expander messing ???
6449 procedure Check_Returns
6453 Proc
: Entity_Id
:= Empty
)
6457 procedure Check_Statement_Sequence
(L
: List_Id
);
6458 -- Internal recursive procedure to check a list of statements for proper
6459 -- termination by a return statement (or a transfer of control or a
6460 -- compound statement that is itself internally properly terminated).
6462 ------------------------------
6463 -- Check_Statement_Sequence --
6464 ------------------------------
6466 procedure Check_Statement_Sequence
(L
: List_Id
) is
6471 function Assert_False
return Boolean;
6472 -- Returns True if Last_Stm is a pragma Assert (False) that has been
6473 -- rewritten as a null statement when assertions are off. The assert
6474 -- is not active, but it is still enough to kill the warning.
6480 function Assert_False
return Boolean is
6481 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
6484 if Nkind
(Orig
) = N_Pragma
6485 and then Pragma_Name
(Orig
) = Name_Assert
6486 and then not Error_Posted
(Orig
)
6489 Arg
: constant Node_Id
:=
6490 First
(Pragma_Argument_Associations
(Orig
));
6491 Exp
: constant Node_Id
:= Expression
(Arg
);
6493 return Nkind
(Exp
) = N_Identifier
6494 and then Chars
(Exp
) = Name_False
;
6504 Raise_Exception_Call
: Boolean;
6505 -- Set True if statement sequence terminated by Raise_Exception call
6506 -- or a Reraise_Occurrence call.
6508 -- Start of processing for Check_Statement_Sequence
6511 Raise_Exception_Call
:= False;
6513 -- Get last real statement
6515 Last_Stm
:= Last
(L
);
6517 -- Deal with digging out exception handler statement sequences that
6518 -- have been transformed by the local raise to goto optimization.
6519 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
6520 -- optimization has occurred, we are looking at something like:
6523 -- original stmts in block
6527 -- goto L1; | omitted if No_Exception_Propagation
6532 -- goto L3; -- skip handler when exception not raised
6534 -- <<L1>> -- target label for local exception
6548 -- and what we have to do is to dig out the estmts1 and estmts2
6549 -- sequences (which were the original sequences of statements in
6550 -- the exception handlers) and check them.
6552 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
6557 exit when Nkind
(Stm
) /= N_Block_Statement
;
6558 exit when not Exception_Junk
(Stm
);
6561 exit when Nkind
(Stm
) /= N_Label
;
6562 exit when not Exception_Junk
(Stm
);
6563 Check_Statement_Sequence
6564 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
6569 exit when Nkind
(Stm
) /= N_Goto_Statement
;
6570 exit when not Exception_Junk
(Stm
);
6574 -- Don't count pragmas
6576 while Nkind
(Last_Stm
) = N_Pragma
6578 -- Don't count call to SS_Release (can happen after Raise_Exception)
6581 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
6583 Nkind
(Name
(Last_Stm
)) = N_Identifier
6585 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
6587 -- Don't count exception junk
6590 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
6592 N_Object_Declaration
)
6593 and then Exception_Junk
(Last_Stm
))
6594 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
6595 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
6597 -- Inserted code, such as finalization calls, is irrelevant: we only
6598 -- need to check original source.
6600 or else Is_Rewrite_Insertion
(Last_Stm
)
6605 -- Here we have the "real" last statement
6607 Kind
:= Nkind
(Last_Stm
);
6609 -- Transfer of control, OK. Note that in the No_Return procedure
6610 -- case, we already diagnosed any explicit return statements, so
6611 -- we can treat them as OK in this context.
6613 if Is_Transfer
(Last_Stm
) then
6616 -- Check cases of explicit non-indirect procedure calls
6618 elsif Kind
= N_Procedure_Call_Statement
6619 and then Is_Entity_Name
(Name
(Last_Stm
))
6621 -- Check call to Raise_Exception procedure which is treated
6622 -- specially, as is a call to Reraise_Occurrence.
6624 -- We suppress the warning in these cases since it is likely that
6625 -- the programmer really does not expect to deal with the case
6626 -- of Null_Occurrence, and thus would find a warning about a
6627 -- missing return curious, and raising Program_Error does not
6628 -- seem such a bad behavior if this does occur.
6630 -- Note that in the Ada 2005 case for Raise_Exception, the actual
6631 -- behavior will be to raise Constraint_Error (see AI-329).
6633 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
6635 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
6637 Raise_Exception_Call
:= True;
6639 -- For Raise_Exception call, test first argument, if it is
6640 -- an attribute reference for a 'Identity call, then we know
6641 -- that the call cannot possibly return.
6644 Arg
: constant Node_Id
:=
6645 Original_Node
(First_Actual
(Last_Stm
));
6647 if Nkind
(Arg
) = N_Attribute_Reference
6648 and then Attribute_Name
(Arg
) = Name_Identity
6655 -- If statement, need to look inside if there is an else and check
6656 -- each constituent statement sequence for proper termination.
6658 elsif Kind
= N_If_Statement
6659 and then Present
(Else_Statements
(Last_Stm
))
6661 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
6662 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6664 if Present
(Elsif_Parts
(Last_Stm
)) then
6666 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
6669 while Present
(Elsif_Part
) loop
6670 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
6678 -- Case statement, check each case for proper termination
6680 elsif Kind
= N_Case_Statement
then
6684 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6685 while Present
(Case_Alt
) loop
6686 Check_Statement_Sequence
(Statements
(Case_Alt
));
6687 Next_Non_Pragma
(Case_Alt
);
6693 -- Block statement, check its handled sequence of statements
6695 elsif Kind
= N_Block_Statement
then
6701 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6710 -- Loop statement. If there is an iteration scheme, we can definitely
6711 -- fall out of the loop. Similarly if there is an exit statement, we
6712 -- can fall out. In either case we need a following return.
6714 elsif Kind
= N_Loop_Statement
then
6715 if Present
(Iteration_Scheme
(Last_Stm
))
6716 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6720 -- A loop with no exit statement or iteration scheme is either
6721 -- an infinite loop, or it has some other exit (raise/return).
6722 -- In either case, no warning is required.
6728 -- Timed entry call, check entry call and delay alternatives
6730 -- Note: in expanded code, the timed entry call has been converted
6731 -- to a set of expanded statements on which the check will work
6732 -- correctly in any case.
6734 elsif Kind
= N_Timed_Entry_Call
then
6736 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6737 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6740 -- If statement sequence of entry call alternative is missing,
6741 -- then we can definitely fall through, and we post the error
6742 -- message on the entry call alternative itself.
6744 if No
(Statements
(ECA
)) then
6747 -- If statement sequence of delay alternative is missing, then
6748 -- we can definitely fall through, and we post the error
6749 -- message on the delay alternative itself.
6751 -- Note: if both ECA and DCA are missing the return, then we
6752 -- post only one message, should be enough to fix the bugs.
6753 -- If not we will get a message next time on the DCA when the
6756 elsif No
(Statements
(DCA
)) then
6759 -- Else check both statement sequences
6762 Check_Statement_Sequence
(Statements
(ECA
));
6763 Check_Statement_Sequence
(Statements
(DCA
));
6768 -- Conditional entry call, check entry call and else part
6770 -- Note: in expanded code, the conditional entry call has been
6771 -- converted to a set of expanded statements on which the check
6772 -- will work correctly in any case.
6774 elsif Kind
= N_Conditional_Entry_Call
then
6776 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6779 -- If statement sequence of entry call alternative is missing,
6780 -- then we can definitely fall through, and we post the error
6781 -- message on the entry call alternative itself.
6783 if No
(Statements
(ECA
)) then
6786 -- Else check statement sequence and else part
6789 Check_Statement_Sequence
(Statements
(ECA
));
6790 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6796 -- If we fall through, issue appropriate message
6800 -- Kill warning if last statement is a raise exception call,
6801 -- or a pragma Assert (False). Note that with assertions enabled,
6802 -- such a pragma has been converted into a raise exception call
6803 -- already, so the Assert_False is for the assertions off case.
6805 if not Raise_Exception_Call
and then not Assert_False
then
6807 -- In GNATprove mode, it is an error to have a missing return
6809 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6811 -- Issue error message or warning
6814 ("RETURN statement missing following this statement<<!",
6817 ("\Program_Error ]<<!", Last_Stm
);
6820 -- Note: we set Err even though we have not issued a warning
6821 -- because we still have a case of a missing return. This is
6822 -- an extremely marginal case, probably will never be noticed
6823 -- but we might as well get it right.
6827 -- Otherwise we have the case of a procedure marked No_Return
6830 if not Raise_Exception_Call
then
6831 if GNATprove_Mode
then
6833 ("implied return after this statement would have raised "
6834 & "Program_Error", Last_Stm
);
6836 -- In normal compilation mode, do not warn on a generated call
6837 -- (e.g. in the body of a renaming as completion).
6839 elsif Comes_From_Source
(Last_Stm
) then
6841 ("implied return after this statement will raise "
6842 & "Program_Error??", Last_Stm
);
6845 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6847 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6851 RE
: constant Node_Id
:=
6852 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6853 Reason
=> PE_Implicit_Return
);
6855 Insert_After
(Last_Stm
, RE
);
6859 end Check_Statement_Sequence
;
6861 -- Start of processing for Check_Returns
6865 Check_Statement_Sequence
(Statements
(HSS
));
6867 if Present
(Exception_Handlers
(HSS
)) then
6868 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6869 while Present
(Handler
) loop
6870 Check_Statement_Sequence
(Statements
(Handler
));
6871 Next_Non_Pragma
(Handler
);
6876 ----------------------------
6877 -- Check_Subprogram_Order --
6878 ----------------------------
6880 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6882 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6883 -- This is used to check if S1 > S2 in the sense required by this test,
6884 -- for example nameab < namec, but name2 < name10.
6886 -----------------------------
6887 -- Subprogram_Name_Greater --
6888 -----------------------------
6890 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6895 -- Deal with special case where names are identical except for a
6896 -- numerical suffix. These are handled specially, taking the numeric
6897 -- ordering from the suffix into account.
6900 while S1
(L1
) in '0' .. '9' loop
6905 while S2
(L2
) in '0' .. '9' loop
6909 -- If non-numeric parts non-equal, do straight compare
6911 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6914 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6915 -- that a missing suffix is treated as numeric zero in this test.
6919 while L1
< S1
'Last loop
6921 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6925 while L2
< S2
'Last loop
6927 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6932 end Subprogram_Name_Greater
;
6934 -- Start of processing for Check_Subprogram_Order
6937 -- Check body in alpha order if this is option
6940 and then Style_Check_Order_Subprograms
6941 and then Nkind
(N
) = N_Subprogram_Body
6942 and then Comes_From_Source
(N
)
6943 and then In_Extended_Main_Source_Unit
(N
)
6947 renames Scope_Stack
.Table
6948 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6950 Body_Id
: constant Entity_Id
:=
6951 Defining_Entity
(Specification
(N
));
6954 Get_Decoded_Name_String
(Chars
(Body_Id
));
6957 if Subprogram_Name_Greater
6958 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6960 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6966 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6969 end Check_Subprogram_Order;
6971 ------------------------------
6972 -- Check_Subtype_Conformant --
6973 ------------------------------
6975 procedure Check_Subtype_Conformant
6976 (New_Id : Entity_Id;
6978 Err_Loc : Node_Id := Empty;
6979 Skip_Controlling_Formals : Boolean := False;
6980 Get_Inst : Boolean := False)
6983 pragma Warnings (Off, Result);
6986 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6987 Skip_Controlling_Formals => Skip_Controlling_Formals,
6988 Get_Inst => Get_Inst);
6989 end Check_Subtype_Conformant;
6991 -----------------------------------
6992 -- Check_Synchronized_Overriding --
6993 -----------------------------------
6995 procedure Check_Synchronized_Overriding
6996 (Def_Id : Entity_Id;
6997 Overridden_Subp : out Entity_Id)
6999 Ifaces_List : Elist_Id;
7003 function Matches_Prefixed_View_Profile
7004 (Prim_Params : List_Id;
7005 Iface_Params : List_Id) return Boolean;
7006 -- Determine whether a subprogram's parameter profile Prim_Params
7007 -- matches that of a potentially overridden interface subprogram
7008 -- Iface_Params. Also determine if the type of first parameter of
7009 -- Iface_Params is an implemented interface.
7011 -----------------------------------
7012 -- Matches_Prefixed_View_Profile --
7013 -----------------------------------
7015 function Matches_Prefixed_View_Profile
7016 (Prim_Params : List_Id;
7017 Iface_Params : List_Id) return Boolean
7019 function Is_Implemented
7020 (Ifaces_List : Elist_Id;
7021 Iface : Entity_Id) return Boolean;
7022 -- Determine if Iface is implemented by the current task or
7025 --------------------
7026 -- Is_Implemented --
7027 --------------------
7029 function Is_Implemented
7030 (Ifaces_List : Elist_Id;
7031 Iface : Entity_Id) return Boolean
7033 Iface_Elmt : Elmt_Id;
7036 Iface_Elmt := First_Elmt (Ifaces_List);
7037 while Present (Iface_Elmt) loop
7038 if Node (Iface_Elmt) = Iface then
7042 Next_Elmt (Iface_Elmt);
7050 Iface_Id : Entity_Id;
7051 Iface_Param : Node_Id;
7052 Iface_Typ : Entity_Id;
7053 Prim_Id : Entity_Id;
7054 Prim_Param : Node_Id;
7055 Prim_Typ : Entity_Id;
7057 -- Start of processing for Matches_Prefixed_View_Profile
7060 Iface_Param := First (Iface_Params);
7061 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
7063 if Is_Access_Type (Iface_Typ) then
7064 Iface_Typ := Designated_Type (Iface_Typ);
7067 Prim_Param := First (Prim_Params);
7069 -- The first parameter of the potentially overridden subprogram must
7070 -- be an interface implemented by Prim.
7072 if not Is_Interface (Iface_Typ)
7073 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7078 -- The checks on the object parameters are done, so move on to the
7079 -- rest of the parameters.
7081 if not In_Scope then
7082 Prim_Param := Next (Prim_Param);
7085 Iface_Param := Next (Iface_Param);
7086 while Present (Iface_Param) and then Present (Prim_Param) loop
7087 Iface_Id := Defining_Identifier (Iface_Param);
7088 Iface_Typ := Find_Parameter_Type (Iface_Param);
7090 Prim_Id := Defining_Identifier (Prim_Param);
7091 Prim_Typ := Find_Parameter_Type (Prim_Param);
7093 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7094 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7095 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7097 Iface_Typ := Designated_Type (Iface_Typ);
7098 Prim_Typ := Designated_Type (Prim_Typ);
7101 -- Case of multiple interface types inside a parameter profile
7103 -- (Obj_Param : in out Iface; ...; Param : Iface)
7105 -- If the interface type is implemented, then the matching type in
7106 -- the primitive should be the implementing record type.
7108 if Ekind (Iface_Typ) = E_Record_Type
7109 and then Is_Interface (Iface_Typ)
7110 and then Is_Implemented (Ifaces_List, Iface_Typ)
7112 if Prim_Typ /= Typ then
7116 -- The two parameters must be both mode and subtype conformant
7118 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7120 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7129 -- One of the two lists contains more parameters than the other
7131 if Present (Iface_Param) or else Present (Prim_Param) then
7136 end Matches_Prefixed_View_Profile;
7138 -- Start of processing for Check_Synchronized_Overriding
7141 Overridden_Subp := Empty;
7143 -- Def_Id must be an entry or a subprogram. We should skip predefined
7144 -- primitives internally generated by the front end; however at this
7145 -- stage predefined primitives are still not fully decorated. As a
7146 -- minor optimization we skip here internally generated subprograms.
7148 if (Ekind (Def_Id) /= E_Entry
7149 and then Ekind (Def_Id) /= E_Function
7150 and then Ekind (Def_Id) /= E_Procedure)
7151 or else not Comes_From_Source (Def_Id)
7156 -- Search for the concurrent declaration since it contains the list of
7157 -- all implemented interfaces. In this case, the subprogram is declared
7158 -- within the scope of a protected or a task type.
7160 if Present (Scope (Def_Id))
7161 and then Is_Concurrent_Type (Scope (Def_Id))
7162 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7164 Typ := Scope (Def_Id);
7167 -- The enclosing scope is not a synchronized type and the subprogram
7170 elsif No (First_Formal (Def_Id)) then
7173 -- The subprogram has formals and hence it may be a primitive of a
7177 Typ := Etype (First_Formal (Def_Id));
7179 if Is_Access_Type (Typ) then
7180 Typ := Directly_Designated_Type (Typ);
7183 if Is_Concurrent_Type (Typ)
7184 and then not Is_Generic_Actual_Type (Typ)
7188 -- This case occurs when the concurrent type is declared within a
7189 -- generic unit. As a result the corresponding record has been built
7190 -- and used as the type of the first formal, we just have to retrieve
7191 -- the corresponding concurrent type.
7193 elsif Is_Concurrent_Record_Type (Typ)
7194 and then not Is_Class_Wide_Type (Typ)
7195 and then Present (Corresponding_Concurrent_Type (Typ))
7197 Typ := Corresponding_Concurrent_Type (Typ);
7205 -- There is no overriding to check if this is an inherited operation in
7206 -- a type derivation for a generic actual.
7208 Collect_Interfaces (Typ, Ifaces_List);
7210 if Is_Empty_Elmt_List (Ifaces_List) then
7214 -- Determine whether entry or subprogram Def_Id overrides a primitive
7215 -- operation that belongs to one of the interfaces in Ifaces_List.
7218 Candidate : Entity_Id := Empty;
7219 Hom : Entity_Id := Empty;
7220 Subp : Entity_Id := Empty;
7223 -- Traverse the homonym chain, looking for a potentially overridden
7224 -- subprogram that belongs to an implemented interface.
7226 Hom := Current_Entity_In_Scope (Def_Id);
7227 while Present (Hom) loop
7231 or else not Is_Overloadable (Subp)
7232 or else not Is_Primitive (Subp)
7233 or else not Is_Dispatching_Operation (Subp)
7234 or else not Present (Find_Dispatching_Type (Subp))
7235 or else not Is_Interface (Find_Dispatching_Type (Subp))
7239 -- Entries and procedures can override abstract or null interface
7242 elsif Ekind_In (Def_Id, E_Entry, E_Procedure)
7243 and then Ekind (Subp) = E_Procedure
7244 and then Matches_Prefixed_View_Profile
7245 (Parameter_Specifications (Parent (Def_Id)),
7246 Parameter_Specifications (Parent (Subp)))
7250 -- For an overridden subprogram Subp, check whether the mode
7251 -- of its first parameter is correct depending on the kind of
7252 -- synchronized type.
7255 Formal : constant Node_Id := First_Formal (Candidate);
7258 -- In order for an entry or a protected procedure to
7259 -- override, the first parameter of the overridden routine
7260 -- must be of mode "out", "in out", or access-to-variable.
7262 if Ekind_In (Candidate, E_Entry, E_Procedure)
7263 and then Is_Protected_Type (Typ)
7264 and then Ekind (Formal) /= E_In_Out_Parameter
7265 and then Ekind (Formal) /= E_Out_Parameter
7266 and then Nkind (Parameter_Type (Parent (Formal))) /=
7271 -- All other cases are OK since a task entry or routine does
7272 -- not have a restriction on the mode of the first parameter
7273 -- of the overridden interface routine.
7276 Overridden_Subp := Candidate;
7281 -- Functions can override abstract interface functions
7283 elsif Ekind (Def_Id) = E_Function
7284 and then Ekind (Subp) = E_Function
7285 and then Matches_Prefixed_View_Profile
7286 (Parameter_Specifications (Parent (Def_Id)),
7287 Parameter_Specifications (Parent (Subp)))
7288 and then Etype (Def_Id) = Etype (Subp)
7292 -- If an inherited subprogram is implemented by a protected
7293 -- function, then the first parameter of the inherited
7294 -- subprogram shall be of mode in, but not an access-to-
7295 -- variable parameter (RM 9.4(11/9)).
7297 if Present (First_Formal (Subp))
7298 and then Ekind (First_Formal (Subp)) = E_In_Parameter
7300 (not Is_Access_Type (Etype (First_Formal (Subp)))
7302 Is_Access_Constant (Etype (First_Formal (Subp))))
7304 Overridden_Subp := Subp;
7309 Hom := Homonym (Hom);
7312 -- After examining all candidates for overriding, we are left with
7313 -- the best match, which is a mode-incompatible interface routine.
7315 if In_Scope and then Present (Candidate) then
7316 Error_Msg_PT (Def_Id, Candidate);
7319 Overridden_Subp := Candidate;
7322 end Check_Synchronized_Overriding;
7324 ---------------------------
7325 -- Check_Type_Conformant --
7326 ---------------------------
7328 procedure Check_Type_Conformant
7329 (New_Id : Entity_Id;
7331 Err_Loc : Node_Id := Empty)
7334 pragma Warnings (Off, Result);
7337 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
7338 end Check_Type_Conformant;
7340 ---------------------------
7341 -- Can_Override_Operator --
7342 ---------------------------
7344 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
7348 if Nkind (Subp) /= N_Defining_Operator_Symbol then
7352 Typ := Base_Type (Etype (First_Formal (Subp)));
7354 -- Check explicitly that the operation is a primitive of the type
7356 return Operator_Matches_Spec (Subp, Subp)
7357 and then not Is_Generic_Type (Typ)
7358 and then Scope (Subp) = Scope (Typ)
7359 and then not Is_Class_Wide_Type (Typ);
7361 end Can_Override_Operator;
7363 ----------------------
7364 -- Conforming_Types --
7365 ----------------------
7367 function Conforming_Types
7370 Ctype : Conformance_Type;
7371 Get_Inst : Boolean := False) return Boolean
7373 function Base_Types_Match
7375 Typ_2 : Entity_Id) return Boolean;
7376 -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are
7377 -- in different scopes (e.g. parent and child instances), then verify
7378 -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on
7379 -- the same subtype chain. The whole purpose of this procedure is to
7380 -- prevent spurious ambiguities in an instantiation that may arise if
7381 -- two distinct generic types are instantiated with the same actual.
7383 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id;
7384 -- An access parameter can designate an incomplete type. If the
7385 -- incomplete type is the limited view of a type from a limited_
7386 -- with_clause, check whether the non-limited view is available.
7387 -- If it is a (non-limited) incomplete type, get the full view.
7389 function Matches_Limited_With_View
7391 Typ_2 : Entity_Id) return Boolean;
7392 -- Returns True if and only if either Typ_1 denotes a limited view of
7393 -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when
7394 -- the limited with view of a type is used in a subprogram declaration
7395 -- and the subprogram body is in the scope of a regular with clause for
7396 -- the same unit. In such a case, the two type entities are considered
7397 -- identical for purposes of conformance checking.
7399 ----------------------
7400 -- Base_Types_Match --
7401 ----------------------
7403 function Base_Types_Match
7405 Typ_2 : Entity_Id) return Boolean
7407 Base_1 : constant Entity_Id := Base_Type (Typ_1);
7408 Base_2 : constant Entity_Id := Base_Type (Typ_2);
7411 if Typ_1 = Typ_2 then
7414 elsif Base_1 = Base_2 then
7416 -- The following is too permissive. A more precise test should
7417 -- check that the generic actual is an ancestor subtype of the
7420 -- See code in Find_Corresponding_Spec that applies an additional
7421 -- filter to handle accidental amiguities in instances.
7424 not Is_Generic_Actual_Type (Typ_1)
7425 or else not Is_Generic_Actual_Type (Typ_2)
7426 or else Scope (Typ_1) /= Scope (Typ_2);
7428 -- If Typ_2 is a generic actual type it is declared as the subtype of
7429 -- the actual. If that actual is itself a subtype we need to use its
7430 -- own base type to check for compatibility.
7432 elsif Ekind (Base_2) = Ekind (Typ_2)
7433 and then Base_1 = Base_Type (Base_2)
7437 elsif Ekind (Base_1) = Ekind (Typ_1)
7438 and then Base_2 = Base_Type (Base_1)
7445 end Base_Types_Match;
7447 --------------------------
7448 -- Find_Designated_Type --
7449 --------------------------
7451 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is
7455 Desig := Directly_Designated_Type (Typ);
7457 if Ekind (Desig) = E_Incomplete_Type then
7459 -- If regular incomplete type, get full view if available
7461 if Present (Full_View (Desig)) then
7462 Desig := Full_View (Desig);
7464 -- If limited view of a type, get non-limited view if available,
7465 -- and check again for a regular incomplete type.
7467 elsif Present (Non_Limited_View (Desig)) then
7468 Desig := Get_Full_View (Non_Limited_View (Desig));
7473 end Find_Designated_Type;
7475 -------------------------------
7476 -- Matches_Limited_With_View --
7477 -------------------------------
7479 function Matches_Limited_With_View
7481 Typ_2 : Entity_Id) return Boolean
7483 function Is_Matching_Limited_View
7485 View : Entity_Id) return Boolean;
7486 -- Determine whether non-limited view View denotes type Typ in some
7487 -- conformant fashion.
7489 ------------------------------
7490 -- Is_Matching_Limited_View --
7491 ------------------------------
7493 function Is_Matching_Limited_View
7495 View : Entity_Id) return Boolean
7497 Root_Typ : Entity_Id;
7498 Root_View : Entity_Id;
7501 -- The non-limited view directly denotes the type
7506 -- The type is a subtype of the non-limited view
7508 elsif Is_Subtype_Of (Typ, View) then
7511 -- Both the non-limited view and the type denote class-wide types
7513 elsif Is_Class_Wide_Type (Typ)
7514 and then Is_Class_Wide_Type (View)
7516 Root_Typ := Root_Type (Typ);
7517 Root_View := Root_Type (View);
7519 if Root_Typ = Root_View then
7522 -- An incomplete tagged type and its full view may receive two
7523 -- distinct class-wide types when the related package has not
7524 -- been analyzed yet.
7527 -- type T is tagged; -- CW_1
7528 -- type T is tagged null record; -- CW_2
7531 -- This is because the package lacks any semantic information
7532 -- that may eventually link both views of T. As a consequence,
7533 -- a client of the limited view of Pack will see CW_2 while a
7534 -- client of the non-limited view of Pack will see CW_1.
7536 elsif Is_Incomplete_Type (Root_Typ)
7537 and then Present (Full_View (Root_Typ))
7538 and then Full_View (Root_Typ) = Root_View
7542 elsif Is_Incomplete_Type (Root_View)
7543 and then Present (Full_View (Root_View))
7544 and then Full_View (Root_View) = Root_Typ
7551 end Is_Matching_Limited_View;
7553 -- Start of processing for Matches_Limited_With_View
7556 -- In some cases a type imported through a limited_with clause, and
7557 -- its non-limited view are both visible, for example in an anonymous
7558 -- access-to-class-wide type in a formal, or when building the body
7559 -- for a subprogram renaming after the subprogram has been frozen.
7560 -- In these cases both entities designate the same type. In addition,
7561 -- if one of them is an actual in an instance, it may be a subtype of
7562 -- the non-limited view of the other.
7564 if From_Limited_With (Typ_1)
7565 and then From_Limited_With (Typ_2)
7566 and then Available_View (Typ_1) = Available_View (Typ_2)
7570 elsif From_Limited_With (Typ_1) then
7571 return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1));
7573 elsif From_Limited_With (Typ_2) then
7574 return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2));
7579 end Matches_Limited_With_View;
7583 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
7585 Type_1 : Entity_Id := T1;
7586 Type_2 : Entity_Id := T2;
7588 -- Start of processing for Conforming_Types
7591 -- The context is an instance association for a formal access-to-
7592 -- subprogram type; the formal parameter types require mapping because
7593 -- they may denote other formal parameters of the generic unit.
7596 Type_1 := Get_Instance_Of (T1);
7597 Type_2 := Get_Instance_Of (T2);
7600 -- If one of the types is a view of the other introduced by a limited
7601 -- with clause, treat these as conforming for all purposes.
7603 if Matches_Limited_With_View (T1, T2) then
7606 elsif Base_Types_Match (Type_1, Type_2) then
7607 if Ctype <= Mode_Conformant then
7612 Subtypes_Statically_Match (Type_1, Type_2)
7613 and then Dimensions_Match (Type_1, Type_2);
7616 elsif Is_Incomplete_Or_Private_Type (Type_1)
7617 and then Present (Full_View (Type_1))
7618 and then Base_Types_Match (Full_View (Type_1), Type_2)
7621 Ctype <= Mode_Conformant
7622 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
7624 elsif Ekind (Type_2) = E_Incomplete_Type
7625 and then Present (Full_View (Type_2))
7626 and then Base_Types_Match (Type_1, Full_View (Type_2))
7629 Ctype <= Mode_Conformant
7630 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7632 elsif Is_Private_Type (Type_2)
7633 and then In_Instance
7634 and then Present (Full_View (Type_2))
7635 and then Base_Types_Match (Type_1, Full_View (Type_2))
7638 Ctype <= Mode_Conformant
7639 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7641 -- Another confusion between views in a nested instance with an
7642 -- actual private type whose full view is not in scope.
7644 elsif Ekind (Type_2) = E_Private_Subtype
7645 and then In_Instance
7646 and then Etype (Type_2) = Type_1
7650 -- In Ada 2012, incomplete types (including limited views) can appear
7651 -- as actuals in instantiations.
7653 elsif Is_Incomplete_Type (Type_1)
7654 and then Is_Incomplete_Type (Type_2)
7655 and then (Used_As_Generic_Actual (Type_1)
7656 or else Used_As_Generic_Actual (Type_2))
7661 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
7662 -- treated recursively because they carry a signature. As far as
7663 -- conformance is concerned, convention plays no role, and either
7664 -- or both could be access to protected subprograms.
7666 Are_Anonymous_Access_To_Subprogram_Types :=
7667 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
7668 E_Anonymous_Access_Protected_Subprogram_Type)
7670 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
7671 E_Anonymous_Access_Protected_Subprogram_Type);
7673 -- Test anonymous access type case. For this case, static subtype
7674 -- matching is required for mode conformance (RM 6.3.1(15)). We check
7675 -- the base types because we may have built internal subtype entities
7676 -- to handle null-excluding types (see Process_Formals).
7678 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
7680 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
7682 -- Ada 2005 (AI-254)
7684 or else Are_Anonymous_Access_To_Subprogram_Types
7687 Desig_1 : Entity_Id;
7688 Desig_2 : Entity_Id;
7691 -- In Ada 2005, access constant indicators must match for
7692 -- subtype conformance.
7694 if Ada_Version >= Ada_2005
7695 and then Ctype >= Subtype_Conformant
7697 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
7702 Desig_1 := Find_Designated_Type (Type_1);
7703 Desig_2 := Find_Designated_Type (Type_2);
7705 -- If the context is an instance association for a formal
7706 -- access-to-subprogram type; formal access parameter designated
7707 -- types require mapping because they may denote other formal
7708 -- parameters of the generic unit.
7711 Desig_1 := Get_Instance_Of (Desig_1);
7712 Desig_2 := Get_Instance_Of (Desig_2);
7715 -- It is possible for a Class_Wide_Type to be introduced for an
7716 -- incomplete type, in which case there is a separate class_ wide
7717 -- type for the full view. The types conform if their Etypes
7718 -- conform, i.e. one may be the full view of the other. This can
7719 -- only happen in the context of an access parameter, other uses
7720 -- of an incomplete Class_Wide_Type are illegal.
7722 if Is_Class_Wide_Type (Desig_1)
7724 Is_Class_Wide_Type (Desig_2)
7728 (Etype (Base_Type (Desig_1)),
7729 Etype (Base_Type (Desig_2)), Ctype);
7731 elsif Are_Anonymous_Access_To_Subprogram_Types then
7732 if Ada_Version < Ada_2005 then
7734 Ctype = Type_Conformant
7735 or else Subtypes_Statically_Match (Desig_1, Desig_2);
7737 -- We must check the conformance of the signatures themselves
7741 Conformant : Boolean;
7744 (Desig_1, Desig_2, Ctype, False, Conformant);
7749 -- A limited view of an actual matches the corresponding
7750 -- incomplete formal.
7752 elsif Ekind (Desig_2) = E_Incomplete_Subtype
7753 and then From_Limited_With (Desig_2)
7754 and then Used_As_Generic_Actual (Etype (Desig_2))
7759 return Base_Type (Desig_1) = Base_Type (Desig_2)
7760 and then (Ctype = Type_Conformant
7762 Subtypes_Statically_Match (Desig_1, Desig_2));
7766 -- Otherwise definitely no match
7769 if ((Ekind (Type_1) = E_Anonymous_Access_Type
7770 and then Is_Access_Type (Type_2))
7771 or else (Ekind (Type_2) = E_Anonymous_Access_Type
7772 and then Is_Access_Type (Type_1)))
7775 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
7777 May_Hide_Profile := True;
7782 end Conforming_Types;
7784 --------------------------
7785 -- Create_Extra_Formals --
7786 --------------------------
7788 procedure Create_Extra_Formals (E : Entity_Id) is
7789 First_Extra : Entity_Id := Empty;
7791 Last_Extra : Entity_Id := Empty;
7793 function Add_Extra_Formal
7794 (Assoc_Entity : Entity_Id;
7797 Suffix : String) return Entity_Id;
7798 -- Add an extra formal to the current list of formals and extra formals.
7799 -- The extra formal is added to the end of the list of extra formals,
7800 -- and also returned as the result. These formals are always of mode IN.
7801 -- The new formal has the type Typ, is declared in Scope, and its name
7802 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
7803 -- The following suffixes are currently used. They should not be changed
7804 -- without coordinating with CodePeer, which makes use of these to
7805 -- provide better messages.
7807 -- O denotes the Constrained bit.
7808 -- L denotes the accessibility level.
7809 -- BIP_xxx denotes an extra formal for a build-in-place function. See
7810 -- the full list in exp_ch6.BIP_Formal_Kind.
7812 ----------------------
7813 -- Add_Extra_Formal --
7814 ----------------------
7816 function Add_Extra_Formal
7817 (Assoc_Entity : Entity_Id;
7820 Suffix : String) return Entity_Id
7822 EF : constant Entity_Id :=
7823 Make_Defining_Identifier (Sloc (Assoc_Entity),
7824 Chars => New_External_Name (Chars (Assoc_Entity),
7828 -- A little optimization. Never generate an extra formal for the
7829 -- _init operand of an initialization procedure, since it could
7832 if Chars (Formal) = Name_uInit then
7836 Set_Ekind (EF, E_In_Parameter);
7837 Set_Actual_Subtype (EF, Typ);
7838 Set_Etype (EF, Typ);
7839 Set_Scope (EF, Scope);
7840 Set_Mechanism (EF, Default_Mechanism);
7841 Set_Formal_Validity (EF);
7843 if No (First_Extra) then
7845 Set_Extra_Formals (Scope, First_Extra);
7848 if Present (Last_Extra) then
7849 Set_Extra_Formal (Last_Extra, EF);
7855 end Add_Extra_Formal;
7859 Formal_Type : Entity_Id;
7860 P_Formal : Entity_Id := Empty;
7862 -- Start of processing for Create_Extra_Formals
7865 -- We never generate extra formals if expansion is not active because we
7866 -- don't need them unless we are generating code.
7868 if not Expander_Active then
7872 -- No need to generate extra formals in interface thunks whose target
7873 -- primitive has no extra formals.
7875 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
7879 -- If this is a derived subprogram then the subtypes of the parent
7880 -- subprogram's formal parameters will be used to determine the need
7881 -- for extra formals.
7883 if Is_Overloadable (E) and then Present (Alias (E)) then
7884 P_Formal := First_Formal (Alias (E));
7887 Formal := First_Formal (E);
7888 while Present (Formal) loop
7889 Last_Extra := Formal;
7890 Next_Formal (Formal);
7893 -- If Extra_Formals were already created, don't do it again. This
7894 -- situation may arise for subprogram types created as part of
7895 -- dispatching calls (see Expand_Dispatching_Call)
7897 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
7901 -- If the subprogram is a predefined dispatching subprogram then don't
7902 -- generate any extra constrained or accessibility level formals. In
7903 -- general we suppress these for internal subprograms (by not calling
7904 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
7905 -- generated stream attributes do get passed through because extra
7906 -- build-in-place formals are needed in some cases (limited 'Input
).
7908 if Is_Predefined_Internal_Operation
(E
) then
7909 goto Test_For_Func_Result_Extras
;
7912 Formal
:= First_Formal
(E
);
7913 while Present
(Formal
) loop
7915 -- Create extra formal for supporting the attribute 'Constrained.
7916 -- The case of a private type view without discriminants also
7917 -- requires the extra formal if the underlying type has defaulted
7920 if Ekind
(Formal
) /= E_In_Parameter
then
7921 if Present
(P_Formal
) then
7922 Formal_Type
:= Etype
(P_Formal
);
7924 Formal_Type
:= Etype
(Formal
);
7927 -- Do not produce extra formals for Unchecked_Union parameters.
7928 -- Jump directly to the end of the loop.
7930 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
7931 goto Skip_Extra_Formal_Generation
;
7934 if not Has_Discriminants
(Formal_Type
)
7935 and then Ekind
(Formal_Type
) in Private_Kind
7936 and then Present
(Underlying_Type
(Formal_Type
))
7938 Formal_Type
:= Underlying_Type
(Formal_Type
);
7941 -- Suppress the extra formal if formal's subtype is constrained or
7942 -- indefinite, or we're compiling for Ada 2012 and the underlying
7943 -- type is tagged and limited. In Ada 2012, a limited tagged type
7944 -- can have defaulted discriminants, but 'Constrained is required
7945 -- to return True, so the formal is never needed (see AI05-0214).
7946 -- Note that this ensures consistency of calling sequences for
7947 -- dispatching operations when some types in a class have defaults
7948 -- on discriminants and others do not (and requiring the extra
7949 -- formal would introduce distributed overhead).
7951 -- If the type does not have a completion yet, treat as prior to
7952 -- Ada 2012 for consistency.
7954 if Has_Discriminants
(Formal_Type
)
7955 and then not Is_Constrained
(Formal_Type
)
7956 and then Is_Definite_Subtype
(Formal_Type
)
7957 and then (Ada_Version
< Ada_2012
7958 or else No
(Underlying_Type
(Formal_Type
))
7960 (Is_Limited_Type
(Formal_Type
)
7963 (Underlying_Type
(Formal_Type
)))))
7965 Set_Extra_Constrained
7966 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
7970 -- Create extra formal for supporting accessibility checking. This
7971 -- is done for both anonymous access formals and formals of named
7972 -- access types that are marked as controlling formals. The latter
7973 -- case can occur when Expand_Dispatching_Call creates a subprogram
7974 -- type and substitutes the types of access-to-class-wide actuals
7975 -- for the anonymous access-to-specific-type of controlling formals.
7976 -- Base_Type is applied because in cases where there is a null
7977 -- exclusion the formal may have an access subtype.
7979 -- This is suppressed if we specifically suppress accessibility
7980 -- checks at the package level for either the subprogram, or the
7981 -- package in which it resides. However, we do not suppress it
7982 -- simply if the scope has accessibility checks suppressed, since
7983 -- this could cause trouble when clients are compiled with a
7984 -- different suppression setting. The explicit checks at the
7985 -- package level are safe from this point of view.
7987 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
7988 or else (Is_Controlling_Formal
(Formal
)
7989 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
7991 (Explicit_Suppress
(E
, Accessibility_Check
)
7993 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
7996 or else Present
(Extra_Accessibility
(P_Formal
)))
7998 Set_Extra_Accessibility
7999 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
8002 -- This label is required when skipping extra formal generation for
8003 -- Unchecked_Union parameters.
8005 <<Skip_Extra_Formal_Generation
>>
8007 if Present
(P_Formal
) then
8008 Next_Formal
(P_Formal
);
8011 Next_Formal
(Formal
);
8014 <<Test_For_Func_Result_Extras
>>
8016 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
8017 -- function call is ... determined by the point of call ...".
8019 if Needs_Result_Accessibility_Level
(E
) then
8020 Set_Extra_Accessibility_Of_Result
8021 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
8024 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
8025 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
8027 if Is_Build_In_Place_Function
(E
) then
8029 Result_Subt
: constant Entity_Id
:= Etype
(E
);
8030 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
8031 Formal_Typ
: Entity_Id
;
8032 Subp_Decl
: Node_Id
;
8034 Discard
: Entity_Id
;
8035 pragma Warnings
(Off
, Discard
);
8038 -- In the case of functions with unconstrained result subtypes,
8039 -- add a 4-state formal indicating whether the return object is
8040 -- allocated by the caller (1), or should be allocated by the
8041 -- callee on the secondary stack (2), in the global heap (3), or
8042 -- in a user-defined storage pool (4). For the moment we just use
8043 -- Natural for the type of this formal. Note that this formal
8044 -- isn't usually needed in the case where the result subtype is
8045 -- constrained, but it is needed when the function has a tagged
8046 -- result, because generally such functions can be called in a
8047 -- dispatching context and such calls must be handled like calls
8048 -- to a class-wide function.
8050 if Needs_BIP_Alloc_Form
(E
) then
8053 (E
, Standard_Natural
,
8054 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
8056 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
8057 -- use a user-defined pool. This formal is not added on
8058 -- ZFP as those targets do not support pools.
8060 if RTE_Available
(RE_Root_Storage_Pool_Ptr
) then
8063 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
8064 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
8068 -- In the case of functions whose result type needs finalization,
8069 -- add an extra formal which represents the finalization master.
8071 if Needs_BIP_Finalization_Master
(E
) then
8074 (E
, RTE
(RE_Finalization_Master_Ptr
),
8075 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
8078 -- When the result type contains tasks, add two extra formals: the
8079 -- master of the tasks to be created, and the caller's activation
8082 if Has_Task
(Full_Subt
) then
8085 (E
, RTE
(RE_Master_Id
),
8086 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
8089 (E
, RTE
(RE_Activation_Chain_Access
),
8090 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
8093 -- All build-in-place functions get an extra formal that will be
8094 -- passed the address of the return object within the caller.
8097 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
8099 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
8100 Set_Etype
(Formal_Typ
, Formal_Typ
);
8101 Set_Depends_On_Private
8102 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
8103 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
8104 Set_Is_Access_Constant
(Formal_Typ
, False);
8106 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
8107 -- the designated type comes from the limited view (for back-end
8110 Set_From_Limited_With
8111 (Formal_Typ
, From_Limited_With
(Result_Subt
));
8113 Layout_Type
(Formal_Typ
);
8115 -- Force the definition of the Itype in case of internal function
8116 -- calls within the same or nested scope.
8118 if Is_Subprogram_Or_Generic_Subprogram
(E
) then
8119 Subp_Decl
:= Parent
(E
);
8121 -- The insertion point for an Itype reference should be after
8122 -- the unit declaration node of the subprogram. An exception
8123 -- to this are inherited operations from a parent type in which
8124 -- case the derived type acts as their parent.
8126 if Nkind_In
(Subp_Decl
, N_Function_Specification
,
8127 N_Procedure_Specification
)
8129 Subp_Decl
:= Parent
(Subp_Decl
);
8132 Build_Itype_Reference
(Formal_Typ
, Subp_Decl
);
8137 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
8140 end Create_Extra_Formals
;
8142 -----------------------------
8143 -- Enter_Overloaded_Entity --
8144 -----------------------------
8146 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
8147 function Matches_Predefined_Op
return Boolean;
8148 -- This returns an approximation of whether S matches a predefined
8149 -- operator, based on the operator symbol, and the parameter and result
8150 -- types. The rules are scattered throughout chapter 4 of the Ada RM.
8152 ---------------------------
8153 -- Matches_Predefined_Op --
8154 ---------------------------
8156 function Matches_Predefined_Op
return Boolean is
8157 Formal_1
: constant Entity_Id
:= First_Formal
(S
);
8158 Formal_2
: constant Entity_Id
:= Next_Formal
(Formal_1
);
8159 Op
: constant Name_Id
:= Chars
(S
);
8160 Result_Type
: constant Entity_Id
:= Base_Type
(Etype
(S
));
8161 Type_1
: constant Entity_Id
:= Base_Type
(Etype
(Formal_1
));
8166 if Present
(Formal_2
) then
8168 Type_2
: constant Entity_Id
:= Base_Type
(Etype
(Formal_2
));
8171 -- All but "&" and "**" have same-types parameters
8180 if Type_1
/= Type_2
then
8185 -- Check parameter and result types
8193 Is_Boolean_Type
(Result_Type
)
8194 and then Result_Type
= Type_1
;
8200 Is_Integer_Type
(Result_Type
)
8201 and then Result_Type
= Type_1
;
8209 Is_Numeric_Type
(Result_Type
)
8210 and then Result_Type
= Type_1
;
8216 Is_Boolean_Type
(Result_Type
)
8217 and then not Is_Limited_Type
(Type_1
);
8225 Is_Boolean_Type
(Result_Type
)
8226 and then (Is_Array_Type
(Type_1
)
8227 or else Is_Scalar_Type
(Type_1
));
8229 when Name_Op_Concat
=>
8230 return Is_Array_Type
(Result_Type
);
8232 when Name_Op_Expon
=>
8234 (Is_Integer_Type
(Result_Type
)
8235 or else Is_Floating_Point_Type
(Result_Type
))
8236 and then Result_Type
= Type_1
8237 and then Type_2
= Standard_Integer
;
8240 raise Program_Error
;
8253 Is_Numeric_Type
(Result_Type
)
8254 and then Result_Type
= Type_1
;
8258 Is_Boolean_Type
(Result_Type
)
8259 and then Result_Type
= Type_1
;
8262 raise Program_Error
;
8265 end Matches_Predefined_Op
;
8269 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
8270 C_E
: Entity_Id
:= Current_Entity
(S
);
8272 -- Start of processing for Enter_Overloaded_Entity
8276 Set_Has_Homonym
(E
);
8277 Set_Has_Homonym
(S
);
8280 Set_Is_Immediately_Visible
(S
);
8281 Set_Scope
(S
, Current_Scope
);
8283 -- Chain new entity if front of homonym in current scope, so that
8284 -- homonyms are contiguous.
8286 if Present
(E
) and then E
/= C_E
then
8287 while Homonym
(C_E
) /= E
loop
8288 C_E
:= Homonym
(C_E
);
8291 Set_Homonym
(C_E
, S
);
8295 Set_Current_Entity
(S
);
8300 if Is_Inherited_Operation
(S
) then
8301 Append_Inherited_Subprogram
(S
);
8303 Append_Entity
(S
, Current_Scope
);
8306 Set_Public_Status
(S
);
8308 if Debug_Flag_E
then
8309 Write_Str
("New overloaded entity chain: ");
8310 Write_Name
(Chars
(S
));
8313 while Present
(E
) loop
8314 Write_Str
(" "); Write_Int
(Int
(E
));
8321 -- Generate warning for hiding
8324 and then Comes_From_Source
(S
)
8325 and then In_Extended_Main_Source_Unit
(S
)
8332 -- Warn unless genuine overloading. Do not emit warning on
8333 -- hiding predefined operators in Standard (these are either an
8334 -- (artifact of our implicit declarations, or simple noise) but
8335 -- keep warning on a operator defined on a local subtype, because
8336 -- of the real danger that different operators may be applied in
8337 -- various parts of the program.
8339 -- Note that if E and S have the same scope, there is never any
8340 -- hiding. Either the two conflict, and the program is illegal,
8341 -- or S is overriding an implicit inherited subprogram.
8343 if Scope
(E
) /= Scope
(S
)
8344 and then (not Is_Overloadable
(E
)
8345 or else Subtype_Conformant
(E
, S
))
8346 and then (Is_Immediately_Visible
(E
)
8347 or else Is_Potentially_Use_Visible
(S
))
8349 if Scope
(E
) = Standard_Standard
then
8350 if Nkind
(S
) = N_Defining_Operator_Symbol
8351 and then Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /=
8353 and then Matches_Predefined_Op
8356 ("declaration of & hides predefined operator?h?", S
);
8359 -- E not immediately within Standard
8362 Error_Msg_Sloc
:= Sloc
(E
);
8363 Error_Msg_N
("declaration of & hides one #?h?", S
);
8368 end Enter_Overloaded_Entity
;
8370 -----------------------------
8371 -- Check_Untagged_Equality --
8372 -----------------------------
8374 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
8375 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
8376 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
8380 -- This check applies only if we have a subprogram declaration with an
8381 -- untagged record type.
8383 if Nkind
(Decl
) /= N_Subprogram_Declaration
8384 or else not Is_Record_Type
(Typ
)
8385 or else Is_Tagged_Type
(Typ
)
8390 -- In Ada 2012 case, we will output errors or warnings depending on
8391 -- the setting of debug flag -gnatd.E.
8393 if Ada_Version
>= Ada_2012
then
8394 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
8396 -- In earlier versions of Ada, nothing to do unless we are warning on
8397 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
8400 if not Warn_On_Ada_2012_Compatibility
then
8405 -- Cases where the type has already been frozen
8407 if Is_Frozen
(Typ
) then
8409 -- If the type is not declared in a package, or if we are in the body
8410 -- of the package or in some other scope, the new operation is not
8411 -- primitive, and therefore legal, though suspicious. Should we
8412 -- generate a warning in this case ???
8414 if Ekind
(Scope
(Typ
)) /= E_Package
8415 or else Scope
(Typ
) /= Current_Scope
8419 -- If the type is a generic actual (sub)type, the operation is not
8420 -- primitive either because the base type is declared elsewhere.
8422 elsif Is_Generic_Actual_Type
(Typ
) then
8425 -- Here we have a definite error of declaration after freezing
8428 if Ada_Version
>= Ada_2012
then
8430 ("equality operator must be declared before type & is "
8431 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
8433 -- In Ada 2012 mode with error turned to warning, output one
8434 -- more warning to warn that the equality operation may not
8435 -- compose. This is the consequence of ignoring the error.
8437 if Error_Msg_Warn
then
8438 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
8443 ("equality operator must be declared before type& is "
8444 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
8447 -- If we are in the package body, we could just move the
8448 -- declaration to the package spec, so add a message saying that.
8450 if In_Package_Body
(Scope
(Typ
)) then
8451 if Ada_Version
>= Ada_2012
then
8453 ("\move declaration to package spec<<", Eq_Op
);
8456 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
8459 -- Otherwise try to find the freezing point
8462 Obj_Decl
:= Next
(Parent
(Typ
));
8463 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
8464 if Nkind
(Obj_Decl
) = N_Object_Declaration
8465 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
8467 -- Freezing point, output warnings
8469 if Ada_Version
>= Ada_2012
then
8471 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
8473 ("\an equality operator cannot be declared after "
8478 ("type& is frozen by declaration (Ada 2012)?y?",
8481 ("\an equality operator cannot be declared after "
8482 & "this point (Ada 2012)?y?",
8494 -- Here if type is not frozen yet. It is illegal to have a primitive
8495 -- equality declared in the private part if the type is visible.
8497 elsif not In_Same_List
(Parent
(Typ
), Decl
)
8498 and then not Is_Limited_Type
(Typ
)
8500 -- Shouldn't we give an RM reference here???
8502 if Ada_Version
>= Ada_2012
then
8504 ("equality operator appears too late<<", Eq_Op
);
8507 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
8510 -- No error detected
8515 end Check_Untagged_Equality
;
8517 -----------------------------
8518 -- Find_Corresponding_Spec --
8519 -----------------------------
8521 function Find_Corresponding_Spec
8523 Post_Error
: Boolean := True) return Entity_Id
8525 Spec
: constant Node_Id
:= Specification
(N
);
8526 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
8530 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
8531 -- Even if fully conformant, a body may depend on a generic actual when
8532 -- the spec does not, or vice versa, in which case they were distinct
8533 -- entities in the generic.
8535 -------------------------------
8536 -- Different_Generic_Profile --
8537 -------------------------------
8539 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
8542 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
8543 -- Check that the types of corresponding formals have the same
8544 -- generic actual if any. We have to account for subtypes of a
8545 -- generic formal, declared between a spec and a body, which may
8546 -- appear distinct in an instance but matched in the generic, and
8547 -- the subtype may be used either in the spec or the body of the
8548 -- subprogram being checked.
8550 -------------------------
8551 -- Same_Generic_Actual --
8552 -------------------------
8554 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
8556 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
8557 -- Predicate to check whether S1 is a subtype of S2 in the source
8560 -------------------------
8561 -- Is_Declared_Subtype --
8562 -------------------------
8564 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
8566 return Comes_From_Source
(Parent
(S1
))
8567 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
8568 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
8569 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
8570 end Is_Declared_Subtype
;
8572 -- Start of processing for Same_Generic_Actual
8575 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
8576 or else Is_Declared_Subtype
(T1
, T2
)
8577 or else Is_Declared_Subtype
(T2
, T1
);
8578 end Same_Generic_Actual
;
8580 -- Start of processing for Different_Generic_Profile
8583 if not In_Instance
then
8586 elsif Ekind
(E
) = E_Function
8587 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
8592 F1
:= First_Formal
(Designator
);
8593 F2
:= First_Formal
(E
);
8594 while Present
(F1
) loop
8595 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
8604 end Different_Generic_Profile
;
8606 -- Start of processing for Find_Corresponding_Spec
8609 E
:= Current_Entity
(Designator
);
8610 while Present
(E
) loop
8612 -- We are looking for a matching spec. It must have the same scope,
8613 -- and the same name, and either be type conformant, or be the case
8614 -- of a library procedure spec and its body (which belong to one
8615 -- another regardless of whether they are type conformant or not).
8617 if Scope
(E
) = Current_Scope
then
8618 if Current_Scope
= Standard_Standard
8619 or else (Ekind
(E
) = Ekind
(Designator
)
8620 and then Type_Conformant
(E
, Designator
))
8622 -- Within an instantiation, we know that spec and body are
8623 -- subtype conformant, because they were subtype conformant in
8624 -- the generic. We choose the subtype-conformant entity here as
8625 -- well, to resolve spurious ambiguities in the instance that
8626 -- were not present in the generic (i.e. when two different
8627 -- types are given the same actual). If we are looking for a
8628 -- spec to match a body, full conformance is expected.
8632 -- Inherit the convention and "ghostness" of the matching
8633 -- spec to ensure proper full and subtype conformance.
8635 Set_Convention
(Designator
, Convention
(E
));
8637 -- Skip past subprogram bodies and subprogram renamings that
8638 -- may appear to have a matching spec, but that aren't fully
8639 -- conformant with it. That can occur in cases where an
8640 -- actual type causes unrelated homographs in the instance.
8642 if Nkind_In
(N
, N_Subprogram_Body
,
8643 N_Subprogram_Renaming_Declaration
)
8644 and then Present
(Homonym
(E
))
8645 and then not Fully_Conformant
(Designator
, E
)
8649 elsif not Subtype_Conformant
(Designator
, E
) then
8652 elsif Different_Generic_Profile
(E
) then
8657 -- Ada 2012 (AI05-0165): For internally generated bodies of
8658 -- null procedures locate the internally generated spec. We
8659 -- enforce mode conformance since a tagged type may inherit
8660 -- from interfaces several null primitives which differ only
8661 -- in the mode of the formals.
8663 if not (Comes_From_Source
(E
))
8664 and then Is_Null_Procedure
(E
)
8665 and then not Mode_Conformant
(Designator
, E
)
8669 -- For null procedures coming from source that are completions,
8670 -- analysis of the generated body will establish the link.
8672 elsif Comes_From_Source
(E
)
8673 and then Nkind
(Spec
) = N_Procedure_Specification
8674 and then Null_Present
(Spec
)
8678 -- Expression functions can be completions, but cannot be
8679 -- completed by an explicit body.
8681 elsif Comes_From_Source
(E
)
8682 and then Comes_From_Source
(N
)
8683 and then Nkind
(N
) = N_Subprogram_Body
8684 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
8685 N_Expression_Function
8687 Error_Msg_Sloc
:= Sloc
(E
);
8688 Error_Msg_N
("body conflicts with expression function#", N
);
8691 elsif not Has_Completion
(E
) then
8692 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
8693 Set_Corresponding_Spec
(N
, E
);
8696 Set_Has_Completion
(E
);
8699 elsif Nkind
(Parent
(N
)) = N_Subunit
then
8701 -- If this is the proper body of a subunit, the completion
8702 -- flag is set when analyzing the stub.
8706 -- If E is an internal function with a controlling result that
8707 -- was created for an operation inherited by a null extension,
8708 -- it may be overridden by a body without a previous spec (one
8709 -- more reason why these should be shunned). In that case we
8710 -- remove the generated body if present, because the current
8711 -- one is the explicit overriding.
8713 elsif Ekind
(E
) = E_Function
8714 and then Ada_Version
>= Ada_2005
8715 and then not Comes_From_Source
(E
)
8716 and then Has_Controlling_Result
(E
)
8717 and then Is_Null_Extension
(Etype
(E
))
8718 and then Comes_From_Source
(Spec
)
8720 Set_Has_Completion
(E
, False);
8723 and then Nkind
(Parent
(E
)) = N_Function_Specification
8726 (Unit_Declaration_Node
8727 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
8731 -- If expansion is disabled, or if the wrapper function has
8732 -- not been generated yet, this a late body overriding an
8733 -- inherited operation, or it is an overriding by some other
8734 -- declaration before the controlling result is frozen. In
8735 -- either case this is a declaration of a new entity.
8741 -- If the body already exists, then this is an error unless
8742 -- the previous declaration is the implicit declaration of a
8743 -- derived subprogram. It is also legal for an instance to
8744 -- contain type conformant overloadable declarations (but the
8745 -- generic declaration may not), per 8.3(26/2).
8747 elsif No
(Alias
(E
))
8748 and then not Is_Intrinsic_Subprogram
(E
)
8749 and then not In_Instance
8752 Error_Msg_Sloc
:= Sloc
(E
);
8754 if Is_Imported
(E
) then
8756 ("body not allowed for imported subprogram & declared#",
8759 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
8763 -- Child units cannot be overloaded, so a conformance mismatch
8764 -- between body and a previous spec is an error.
8766 elsif Is_Child_Unit
(E
)
8768 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
8770 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
8775 ("body of child unit does not match previous declaration", N
);
8783 -- On exit, we know that no previous declaration of subprogram exists
8786 end Find_Corresponding_Spec
;
8788 ----------------------
8789 -- Fully_Conformant --
8790 ----------------------
8792 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8795 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
8797 end Fully_Conformant
;
8799 ----------------------------------
8800 -- Fully_Conformant_Expressions --
8801 ----------------------------------
8803 function Fully_Conformant_Expressions
8804 (Given_E1
: Node_Id
;
8805 Given_E2
: Node_Id
) return Boolean
8807 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
8808 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
8809 -- We always test conformance on original nodes, since it is possible
8810 -- for analysis and/or expansion to make things look as though they
8811 -- conform when they do not, e.g. by converting 1+2 into 3.
8813 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
8814 renames Fully_Conformant_Expressions
;
8816 function FCL
(L1
, L2
: List_Id
) return Boolean;
8817 -- Compare elements of two lists for conformance. Elements have to be
8818 -- conformant, and actuals inserted as default parameters do not match
8819 -- explicit actuals with the same value.
8821 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
8822 -- Compare an operator node with a function call
8828 function FCL
(L1
, L2
: List_Id
) return Boolean is
8832 if L1
= No_List
then
8838 if L2
= No_List
then
8844 -- Compare two lists, skipping rewrite insertions (we want to compare
8845 -- the original trees, not the expanded versions).
8848 if Is_Rewrite_Insertion
(N1
) then
8850 elsif Is_Rewrite_Insertion
(N2
) then
8856 elsif not FCE
(N1
, N2
) then
8869 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
8870 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
8875 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
8880 Act
:= First
(Actuals
);
8882 if Nkind
(Op_Node
) in N_Binary_Op
then
8883 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
8890 return Present
(Act
)
8891 and then FCE
(Right_Opnd
(Op_Node
), Act
)
8892 and then No
(Next
(Act
));
8896 -- Start of processing for Fully_Conformant_Expressions
8899 -- Nonconformant if paren count does not match. Note: if some idiot
8900 -- complains that we don't do this right for more than 3 levels of
8901 -- parentheses, they will be treated with the respect they deserve.
8903 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
8906 -- If same entities are referenced, then they are conformant even if
8907 -- they have different forms (RM 8.3.1(19-20)).
8909 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
8910 if Present
(Entity
(E1
)) then
8911 return Entity
(E1
) = Entity
(E2
)
8913 -- One may be a discriminant that has been replaced by the
8914 -- corresponding discriminal.
8917 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8918 and then Ekind
(Entity
(E1
)) = E_Discriminant
8919 and then Ekind
(Entity
(E2
)) = E_In_Parameter
)
8921 -- The discriminant of a protected type is transformed into
8922 -- a local constant and then into a parameter of a protected
8926 (Ekind
(Entity
(E1
)) = E_Constant
8927 and then Ekind
(Entity
(E2
)) = E_In_Parameter
8928 and then Present
(Discriminal_Link
(Entity
(E1
)))
8929 and then Discriminal_Link
(Entity
(E1
)) =
8930 Discriminal_Link
(Entity
(E2
)))
8932 -- AI12-050: The loop variables of quantified expressions
8933 -- match if they have the same identifier, even though they
8934 -- are different entities.
8937 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8938 and then Ekind
(Entity
(E1
)) = E_Loop_Parameter
8939 and then Ekind
(Entity
(E2
)) = E_Loop_Parameter
);
8941 elsif Nkind
(E1
) = N_Expanded_Name
8942 and then Nkind
(E2
) = N_Expanded_Name
8943 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8944 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8946 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
8949 -- Identifiers in component associations don't always have
8950 -- entities, but their names must conform.
8952 return Nkind
(E1
) = N_Identifier
8953 and then Nkind
(E2
) = N_Identifier
8954 and then Chars
(E1
) = Chars
(E2
);
8957 elsif Nkind
(E1
) = N_Character_Literal
8958 and then Nkind
(E2
) = N_Expanded_Name
8960 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8961 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
8963 elsif Nkind
(E2
) = N_Character_Literal
8964 and then Nkind
(E1
) = N_Expanded_Name
8966 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8967 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
8969 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
8970 return FCO
(E1
, E2
);
8972 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
8973 return FCO
(E2
, E1
);
8975 -- Otherwise we must have the same syntactic entity
8977 elsif Nkind
(E1
) /= Nkind
(E2
) then
8980 -- At this point, we specialize by node type
8986 FCL
(Expressions
(E1
), Expressions
(E2
))
8988 FCL
(Component_Associations
(E1
),
8989 Component_Associations
(E2
));
8992 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
8994 Nkind
(Expression
(E2
)) = N_Qualified_Expression
8996 return FCE
(Expression
(E1
), Expression
(E2
));
8998 -- Check that the subtype marks and any constraints
9003 Indic1
: constant Node_Id
:= Expression
(E1
);
9004 Indic2
: constant Node_Id
:= Expression
(E2
);
9009 if Nkind
(Indic1
) /= N_Subtype_Indication
then
9011 Nkind
(Indic2
) /= N_Subtype_Indication
9012 and then Entity
(Indic1
) = Entity
(Indic2
);
9014 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
9016 Nkind
(Indic1
) /= N_Subtype_Indication
9017 and then Entity
(Indic1
) = Entity
(Indic2
);
9020 if Entity
(Subtype_Mark
(Indic1
)) /=
9021 Entity
(Subtype_Mark
(Indic2
))
9026 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
9027 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
9028 while Present
(Elt1
) and then Present
(Elt2
) loop
9029 if not FCE
(Elt1
, Elt2
) then
9042 when N_Attribute_Reference
=>
9044 Attribute_Name
(E1
) = Attribute_Name
(E2
)
9045 and then FCL
(Expressions
(E1
), Expressions
(E2
));
9049 Entity
(E1
) = Entity
(E2
)
9050 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9051 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9053 when N_Membership_Test
9057 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9059 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9061 when N_Case_Expression
=>
9067 if not FCE
(Expression
(E1
), Expression
(E2
)) then
9071 Alt1
:= First
(Alternatives
(E1
));
9072 Alt2
:= First
(Alternatives
(E2
));
9074 if Present
(Alt1
) /= Present
(Alt2
) then
9076 elsif No
(Alt1
) then
9080 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
9081 or else not FCL
(Discrete_Choices
(Alt1
),
9082 Discrete_Choices
(Alt2
))
9093 when N_Character_Literal
=>
9095 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
9097 when N_Component_Association
=>
9099 FCL
(Choices
(E1
), Choices
(E2
))
9101 FCE
(Expression
(E1
), Expression
(E2
));
9103 when N_Explicit_Dereference
=>
9105 FCE
(Prefix
(E1
), Prefix
(E2
));
9107 when N_Extension_Aggregate
=>
9109 FCL
(Expressions
(E1
), Expressions
(E2
))
9110 and then Null_Record_Present
(E1
) =
9111 Null_Record_Present
(E2
)
9112 and then FCL
(Component_Associations
(E1
),
9113 Component_Associations
(E2
));
9115 when N_Function_Call
=>
9117 FCE
(Name
(E1
), Name
(E2
))
9119 FCL
(Parameter_Associations
(E1
),
9120 Parameter_Associations
(E2
));
9122 when N_If_Expression
=>
9124 FCL
(Expressions
(E1
), Expressions
(E2
));
9126 when N_Indexed_Component
=>
9128 FCE
(Prefix
(E1
), Prefix
(E2
))
9130 FCL
(Expressions
(E1
), Expressions
(E2
));
9132 when N_Integer_Literal
=>
9133 return (Intval
(E1
) = Intval
(E2
));
9138 when N_Operator_Symbol
=>
9140 Chars
(E1
) = Chars
(E2
);
9142 when N_Others_Choice
=>
9145 when N_Parameter_Association
=>
9147 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
9148 and then FCE
(Explicit_Actual_Parameter
(E1
),
9149 Explicit_Actual_Parameter
(E2
));
9151 when N_Qualified_Expression
9153 | N_Unchecked_Type_Conversion
9156 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
9158 FCE
(Expression
(E1
), Expression
(E2
));
9160 when N_Quantified_Expression
=>
9161 if not FCE
(Condition
(E1
), Condition
(E2
)) then
9165 if Present
(Loop_Parameter_Specification
(E1
))
9166 and then Present
(Loop_Parameter_Specification
(E2
))
9169 L1
: constant Node_Id
:=
9170 Loop_Parameter_Specification
(E1
);
9171 L2
: constant Node_Id
:=
9172 Loop_Parameter_Specification
(E2
);
9176 Reverse_Present
(L1
) = Reverse_Present
(L2
)
9178 FCE
(Defining_Identifier
(L1
),
9179 Defining_Identifier
(L2
))
9181 FCE
(Discrete_Subtype_Definition
(L1
),
9182 Discrete_Subtype_Definition
(L2
));
9185 elsif Present
(Iterator_Specification
(E1
))
9186 and then Present
(Iterator_Specification
(E2
))
9189 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
9190 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
9194 FCE
(Defining_Identifier
(I1
),
9195 Defining_Identifier
(I2
))
9197 Of_Present
(I1
) = Of_Present
(I2
)
9199 Reverse_Present
(I1
) = Reverse_Present
(I2
)
9200 and then FCE
(Name
(I1
), Name
(I2
))
9201 and then FCE
(Subtype_Indication
(I1
),
9202 Subtype_Indication
(I2
));
9205 -- The quantified expressions used different specifications to
9206 -- walk their respective ranges.
9214 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
9216 FCE
(High_Bound
(E1
), High_Bound
(E2
));
9218 when N_Real_Literal
=>
9219 return (Realval
(E1
) = Realval
(E2
));
9221 when N_Selected_Component
=>
9223 FCE
(Prefix
(E1
), Prefix
(E2
))
9225 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
9229 FCE
(Prefix
(E1
), Prefix
(E2
))
9231 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
9233 when N_String_Literal
=>
9235 S1
: constant String_Id
:= Strval
(E1
);
9236 S2
: constant String_Id
:= Strval
(E2
);
9237 L1
: constant Nat
:= String_Length
(S1
);
9238 L2
: constant Nat
:= String_Length
(S2
);
9245 for J
in 1 .. L1
loop
9246 if Get_String_Char
(S1
, J
) /=
9247 Get_String_Char
(S2
, J
)
9259 Entity
(E1
) = Entity
(E2
)
9261 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9263 -- All other node types cannot appear in this context. Strictly
9264 -- we should raise a fatal internal error. Instead we just ignore
9265 -- the nodes. This means that if anyone makes a mistake in the
9266 -- expander and mucks an expression tree irretrievably, the result
9267 -- will be a failure to detect a (probably very obscure) case
9268 -- of non-conformance, which is better than bombing on some
9269 -- case where two expressions do in fact conform.
9275 end Fully_Conformant_Expressions
;
9277 ----------------------------------------
9278 -- Fully_Conformant_Discrete_Subtypes --
9279 ----------------------------------------
9281 function Fully_Conformant_Discrete_Subtypes
9282 (Given_S1
: Node_Id
;
9283 Given_S2
: Node_Id
) return Boolean
9285 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
9286 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
9288 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
9289 -- Special-case for a bound given by a discriminant, which in the body
9290 -- is replaced with the discriminal of the enclosing type.
9292 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
9293 -- Check both bounds
9295 -----------------------
9296 -- Conforming_Bounds --
9297 -----------------------
9299 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
9301 if Is_Entity_Name
(B1
)
9302 and then Is_Entity_Name
(B2
)
9303 and then Ekind
(Entity
(B1
)) = E_Discriminant
9305 return Chars
(B1
) = Chars
(B2
);
9308 return Fully_Conformant_Expressions
(B1
, B2
);
9310 end Conforming_Bounds
;
9312 -----------------------
9313 -- Conforming_Ranges --
9314 -----------------------
9316 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
9319 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
9321 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
9322 end Conforming_Ranges
;
9324 -- Start of processing for Fully_Conformant_Discrete_Subtypes
9327 if Nkind
(S1
) /= Nkind
(S2
) then
9330 elsif Is_Entity_Name
(S1
) then
9331 return Entity
(S1
) = Entity
(S2
);
9333 elsif Nkind
(S1
) = N_Range
then
9334 return Conforming_Ranges
(S1
, S2
);
9336 elsif Nkind
(S1
) = N_Subtype_Indication
then
9338 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
9341 (Range_Expression
(Constraint
(S1
)),
9342 Range_Expression
(Constraint
(S2
)));
9346 end Fully_Conformant_Discrete_Subtypes
;
9348 --------------------
9349 -- Install_Entity --
9350 --------------------
9352 procedure Install_Entity
(E
: Entity_Id
) is
9353 Prev
: constant Entity_Id
:= Current_Entity
(E
);
9355 Set_Is_Immediately_Visible
(E
);
9356 Set_Current_Entity
(E
);
9357 Set_Homonym
(E
, Prev
);
9360 ---------------------
9361 -- Install_Formals --
9362 ---------------------
9364 procedure Install_Formals
(Id
: Entity_Id
) is
9367 F
:= First_Formal
(Id
);
9368 while Present
(F
) loop
9372 end Install_Formals
;
9374 -----------------------------
9375 -- Is_Interface_Conformant --
9376 -----------------------------
9378 function Is_Interface_Conformant
9379 (Tagged_Type
: Entity_Id
;
9380 Iface_Prim
: Entity_Id
;
9381 Prim
: Entity_Id
) return Boolean
9383 -- The operation may in fact be an inherited (implicit) operation
9384 -- rather than the original interface primitive, so retrieve the
9385 -- ultimate ancestor.
9387 Iface
: constant Entity_Id
:=
9388 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
9389 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
9391 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
9392 -- Return the controlling formal of Prim
9394 ------------------------
9395 -- Controlling_Formal --
9396 ------------------------
9398 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
9402 E
:= First_Entity
(Prim
);
9403 while Present
(E
) loop
9404 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
9412 end Controlling_Formal
;
9416 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
9417 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
9419 -- Start of processing for Is_Interface_Conformant
9422 pragma Assert
(Is_Subprogram
(Iface_Prim
)
9423 and then Is_Subprogram
(Prim
)
9424 and then Is_Dispatching_Operation
(Iface_Prim
)
9425 and then Is_Dispatching_Operation
(Prim
));
9427 pragma Assert
(Is_Interface
(Iface
)
9428 or else (Present
(Alias
(Iface_Prim
))
9431 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
9433 if Prim
= Iface_Prim
9434 or else not Is_Subprogram
(Prim
)
9435 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
9436 or else not Is_Dispatching_Operation
(Prim
)
9437 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
9439 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
9440 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
9444 -- The mode of the controlling formals must match
9446 elsif Present
(Iface_Ctrl_F
)
9447 and then Present
(Prim_Ctrl_F
)
9448 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
9452 -- Case of a procedure, or a function whose result type matches the
9453 -- result type of the interface primitive, or a function that has no
9454 -- controlling result (I or access I).
9456 elsif Ekind
(Iface_Prim
) = E_Procedure
9457 or else Etype
(Prim
) = Etype
(Iface_Prim
)
9458 or else not Has_Controlling_Result
(Prim
)
9460 return Type_Conformant
9461 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
9463 -- Case of a function returning an interface, or an access to one. Check
9464 -- that the return types correspond.
9466 elsif Implements_Interface
(Typ
, Iface
) then
9467 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
9469 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
9474 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
9475 Skip_Controlling_Formals
=> True);
9481 end Is_Interface_Conformant
;
9483 ---------------------------------
9484 -- Is_Non_Overriding_Operation --
9485 ---------------------------------
9487 function Is_Non_Overriding_Operation
9488 (Prev_E
: Entity_Id
;
9489 New_E
: Entity_Id
) return Boolean
9493 G_Typ
: Entity_Id
:= Empty
;
9495 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
9496 -- If F_Type is a derived type associated with a generic actual subtype,
9497 -- then return its Generic_Parent_Type attribute, else return Empty.
9499 function Types_Correspond
9500 (P_Type
: Entity_Id
;
9501 N_Type
: Entity_Id
) return Boolean;
9502 -- Returns true if and only if the types (or designated types in the
9503 -- case of anonymous access types) are the same or N_Type is derived
9504 -- directly or indirectly from P_Type.
9506 -----------------------------
9507 -- Get_Generic_Parent_Type --
9508 -----------------------------
9510 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
9516 if Is_Derived_Type
(F_Typ
)
9517 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
9519 -- The tree must be traversed to determine the parent subtype in
9520 -- the generic unit, which unfortunately isn't always available
9521 -- via semantic attributes. ??? (Note: The use of Original_Node
9522 -- is needed for cases where a full derived type has been
9525 -- If the parent type is a scalar type, the derivation creates
9526 -- an anonymous base type for it, and the source type is its
9529 if Is_Scalar_Type
(F_Typ
)
9530 and then not Comes_From_Source
(F_Typ
)
9534 (Original_Node
(Parent
(First_Subtype
(F_Typ
))));
9536 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
9538 if Nkind
(Defn
) = N_Derived_Type_Definition
then
9539 Indic
:= Subtype_Indication
(Defn
);
9541 if Nkind
(Indic
) = N_Subtype_Indication
then
9542 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
9544 G_Typ
:= Entity
(Indic
);
9547 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
9548 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
9550 return Generic_Parent_Type
(Parent
(G_Typ
));
9556 end Get_Generic_Parent_Type
;
9558 ----------------------
9559 -- Types_Correspond --
9560 ----------------------
9562 function Types_Correspond
9563 (P_Type
: Entity_Id
;
9564 N_Type
: Entity_Id
) return Boolean
9566 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
9567 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
9570 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
9571 Prev_Type
:= Designated_Type
(Prev_Type
);
9574 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
9575 New_Type
:= Designated_Type
(New_Type
);
9578 if Prev_Type
= New_Type
then
9581 elsif not Is_Class_Wide_Type
(New_Type
) then
9582 while Etype
(New_Type
) /= New_Type
loop
9583 New_Type
:= Etype
(New_Type
);
9585 if New_Type
= Prev_Type
then
9591 end Types_Correspond
;
9593 -- Start of processing for Is_Non_Overriding_Operation
9596 -- In the case where both operations are implicit derived subprograms
9597 -- then neither overrides the other. This can only occur in certain
9598 -- obscure cases (e.g., derivation from homographs created in a generic
9601 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
9604 elsif Ekind
(Current_Scope
) = E_Package
9605 and then Is_Generic_Instance
(Current_Scope
)
9606 and then In_Private_Part
(Current_Scope
)
9607 and then Comes_From_Source
(New_E
)
9609 -- We examine the formals and result type of the inherited operation,
9610 -- to determine whether their type is derived from (the instance of)
9611 -- a generic type. The first such formal or result type is the one
9614 Formal
:= First_Formal
(Prev_E
);
9616 while Present
(Formal
) loop
9617 F_Typ
:= Base_Type
(Etype
(Formal
));
9619 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
9620 F_Typ
:= Designated_Type
(F_Typ
);
9623 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
9624 exit when Present
(G_Typ
);
9626 Next_Formal
(Formal
);
9629 -- If the function dispatches on result check the result type
9631 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
9632 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
9639 -- If the generic type is a private type, then the original operation
9640 -- was not overriding in the generic, because there was no primitive
9641 -- operation to override.
9643 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
9644 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
9645 N_Formal_Private_Type_Definition
9649 -- The generic parent type is the ancestor of a formal derived
9650 -- type declaration. We need to check whether it has a primitive
9651 -- operation that should be overridden by New_E in the generic.
9655 P_Formal
: Entity_Id
;
9656 N_Formal
: Entity_Id
;
9660 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
9663 while Present
(Prim_Elt
) loop
9664 P_Prim
:= Node
(Prim_Elt
);
9666 if Chars
(P_Prim
) = Chars
(New_E
)
9667 and then Ekind
(P_Prim
) = Ekind
(New_E
)
9669 P_Formal
:= First_Formal
(P_Prim
);
9670 N_Formal
:= First_Formal
(New_E
);
9671 while Present
(P_Formal
) and then Present
(N_Formal
) loop
9672 P_Typ
:= Etype
(P_Formal
);
9673 N_Typ
:= Etype
(N_Formal
);
9675 if not Types_Correspond
(P_Typ
, N_Typ
) then
9679 Next_Entity
(P_Formal
);
9680 Next_Entity
(N_Formal
);
9683 -- Found a matching primitive operation belonging to the
9684 -- formal ancestor type, so the new subprogram is
9688 and then No
(N_Formal
)
9689 and then (Ekind
(New_E
) /= E_Function
9692 (Etype
(P_Prim
), Etype
(New_E
)))
9698 Next_Elmt
(Prim_Elt
);
9701 -- If no match found, then the new subprogram does not override
9702 -- in the generic (nor in the instance).
9704 -- If the type in question is not abstract, and the subprogram
9705 -- is, this will be an error if the new operation is in the
9706 -- private part of the instance. Emit a warning now, which will
9707 -- make the subsequent error message easier to understand.
9709 if Present
(F_Typ
) and then not Is_Abstract_Type
(F_Typ
)
9710 and then Is_Abstract_Subprogram
(Prev_E
)
9711 and then In_Private_Part
(Current_Scope
)
9713 Error_Msg_Node_2
:= F_Typ
;
9715 ("private operation& in generic unit does not override "
9716 & "any primitive operation of& (RM 12.3 (18))??",
9726 end Is_Non_Overriding_Operation
;
9728 -------------------------------------
9729 -- List_Inherited_Pre_Post_Aspects --
9730 -------------------------------------
9732 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
9734 if Opt
.List_Inherited_Aspects
9735 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
9738 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
9743 for Index
in Subps
'Range loop
9744 Items
:= Contract
(Subps
(Index
));
9746 if Present
(Items
) then
9747 Prag
:= Pre_Post_Conditions
(Items
);
9748 while Present
(Prag
) loop
9749 Error_Msg_Sloc
:= Sloc
(Prag
);
9751 if Class_Present
(Prag
)
9752 and then not Split_PPC
(Prag
)
9754 if Pragma_Name
(Prag
) = Name_Precondition
then
9756 ("info: & inherits `Pre''Class` aspect from "
9760 ("info: & inherits `Post''Class` aspect from "
9765 Prag
:= Next_Pragma
(Prag
);
9771 end List_Inherited_Pre_Post_Aspects
;
9773 ------------------------------
9774 -- Make_Inequality_Operator --
9775 ------------------------------
9777 -- S is the defining identifier of an equality operator. We build a
9778 -- subprogram declaration with the right signature. This operation is
9779 -- intrinsic, because it is always expanded as the negation of the
9780 -- call to the equality function.
9782 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
9783 Loc
: constant Source_Ptr
:= Sloc
(S
);
9786 Op_Name
: Entity_Id
;
9788 FF
: constant Entity_Id
:= First_Formal
(S
);
9789 NF
: constant Entity_Id
:= Next_Formal
(FF
);
9792 -- Check that equality was properly defined, ignore call if not
9799 A
: constant Entity_Id
:=
9800 Make_Defining_Identifier
(Sloc
(FF
),
9801 Chars
=> Chars
(FF
));
9803 B
: constant Entity_Id
:=
9804 Make_Defining_Identifier
(Sloc
(NF
),
9805 Chars
=> Chars
(NF
));
9808 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
9810 Formals
:= New_List
(
9811 Make_Parameter_Specification
(Loc
,
9812 Defining_Identifier
=> A
,
9814 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
9815 Sloc
(Etype
(First_Formal
(S
))))),
9817 Make_Parameter_Specification
(Loc
,
9818 Defining_Identifier
=> B
,
9820 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
9821 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
9824 Make_Subprogram_Declaration
(Loc
,
9826 Make_Function_Specification
(Loc
,
9827 Defining_Unit_Name
=> Op_Name
,
9828 Parameter_Specifications
=> Formals
,
9829 Result_Definition
=>
9830 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
9832 -- Insert inequality right after equality if it is explicit or after
9833 -- the derived type when implicit. These entities are created only
9834 -- for visibility purposes, and eventually replaced in the course
9835 -- of expansion, so they do not need to be attached to the tree and
9836 -- seen by the back-end. Keeping them internal also avoids spurious
9837 -- freezing problems. The declaration is inserted in the tree for
9838 -- analysis, and removed afterwards. If the equality operator comes
9839 -- from an explicit declaration, attach the inequality immediately
9840 -- after. Else the equality is inherited from a derived type
9841 -- declaration, so insert inequality after that declaration.
9843 if No
(Alias
(S
)) then
9844 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
9845 elsif Is_List_Member
(Parent
(S
)) then
9846 Insert_After
(Parent
(S
), Decl
);
9848 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
9851 Mark_Rewrite_Insertion
(Decl
);
9852 Set_Is_Intrinsic_Subprogram
(Op_Name
);
9855 Set_Has_Completion
(Op_Name
);
9856 Set_Corresponding_Equality
(Op_Name
, S
);
9857 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
9859 end Make_Inequality_Operator
;
9861 ----------------------
9862 -- May_Need_Actuals --
9863 ----------------------
9865 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
9870 F
:= First_Formal
(Fun
);
9872 while Present
(F
) loop
9873 if No
(Default_Value
(F
)) then
9881 Set_Needs_No_Actuals
(Fun
, B
);
9882 end May_Need_Actuals
;
9884 ---------------------
9885 -- Mode_Conformant --
9886 ---------------------
9888 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
9891 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
9893 end Mode_Conformant
;
9895 ---------------------------
9896 -- New_Overloaded_Entity --
9897 ---------------------------
9899 procedure New_Overloaded_Entity
9901 Derived_Type
: Entity_Id
:= Empty
)
9903 Overridden_Subp
: Entity_Id
:= Empty
;
9904 -- Set if the current scope has an operation that is type-conformant
9905 -- with S, and becomes hidden by S.
9907 Is_Primitive_Subp
: Boolean;
9908 -- Set to True if the new subprogram is primitive
9911 -- Entity that S overrides
9913 Prev_Vis
: Entity_Id
:= Empty
;
9914 -- Predecessor of E in Homonym chain
9916 procedure Check_For_Primitive_Subprogram
9917 (Is_Primitive
: out Boolean;
9918 Is_Overriding
: Boolean := False);
9919 -- If the subprogram being analyzed is a primitive operation of the type
9920 -- of a formal or result, set the Has_Primitive_Operations flag on the
9921 -- type, and set Is_Primitive to True (otherwise set to False). Set the
9922 -- corresponding flag on the entity itself for later use.
9924 function Has_Matching_Entry_Or_Subprogram
(E
: Entity_Id
) return Boolean;
9925 -- True if a) E is a subprogram whose first formal is a concurrent type
9926 -- defined in the scope of E that has some entry or subprogram whose
9927 -- profile matches E, or b) E is an internally built dispatching
9928 -- subprogram of a protected type and there is a matching subprogram
9929 -- defined in the enclosing scope of the protected type, or c) E is
9930 -- an entry of a synchronized type and a matching procedure has been
9931 -- previously defined in the enclosing scope of the synchronized type.
9933 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
9934 -- Check that E is declared in the private part of the current package,
9935 -- or in the package body, where it may hide a previous declaration.
9936 -- We can't use In_Private_Part by itself because this flag is also
9937 -- set when freezing entities, so we must examine the place of the
9938 -- declaration in the tree, and recognize wrapper packages as well.
9940 function Is_Overriding_Alias
9942 New_E
: Entity_Id
) return Boolean;
9943 -- Check whether new subprogram and old subprogram are both inherited
9944 -- from subprograms that have distinct dispatch table entries. This can
9945 -- occur with derivations from instances with accidental homonyms. The
9946 -- function is conservative given that the converse is only true within
9947 -- instances that contain accidental overloadings.
9949 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
);
9950 -- Report conflict between entities S and E
9952 ------------------------------------
9953 -- Check_For_Primitive_Subprogram --
9954 ------------------------------------
9956 procedure Check_For_Primitive_Subprogram
9957 (Is_Primitive
: out Boolean;
9958 Is_Overriding
: Boolean := False)
9964 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
9965 -- Returns true if T is declared in the visible part of the current
9966 -- package scope; otherwise returns false. Assumes that T is declared
9969 procedure Check_Private_Overriding
(T
: Entity_Id
);
9970 -- Checks that if a primitive abstract subprogram of a visible
9971 -- abstract type is declared in a private part, then it must override
9972 -- an abstract subprogram declared in the visible part. Also checks
9973 -- that if a primitive function with a controlling result is declared
9974 -- in a private part, then it must override a function declared in
9975 -- the visible part.
9977 ------------------------------
9978 -- Check_Private_Overriding --
9979 ------------------------------
9981 procedure Check_Private_Overriding
(T
: Entity_Id
) is
9982 function Overrides_Private_Part_Op
return Boolean;
9983 -- This detects the special case where the overriding subprogram
9984 -- is overriding a subprogram that was declared in the same
9985 -- private part. That case is illegal by 3.9.3(10).
9987 function Overrides_Visible_Function
9988 (Partial_View
: Entity_Id
) return Boolean;
9989 -- True if S overrides a function in the visible part. The
9990 -- overridden function could be explicitly or implicitly declared.
9992 -------------------------------
9993 -- Overrides_Private_Part_Op --
9994 -------------------------------
9996 function Overrides_Private_Part_Op
return Boolean is
9997 Over_Decl
: constant Node_Id
:=
9998 Unit_Declaration_Node
(Overridden_Operation
(S
));
9999 Subp_Decl
: constant Node_Id
:= Unit_Declaration_Node
(S
);
10002 pragma Assert
(Is_Overriding
);
10004 (Nkind
(Over_Decl
) = N_Abstract_Subprogram_Declaration
);
10006 (Nkind
(Subp_Decl
) = N_Abstract_Subprogram_Declaration
);
10008 return In_Same_List
(Over_Decl
, Subp_Decl
);
10009 end Overrides_Private_Part_Op
;
10011 --------------------------------
10012 -- Overrides_Visible_Function --
10013 --------------------------------
10015 function Overrides_Visible_Function
10016 (Partial_View
: Entity_Id
) return Boolean
10019 if not Is_Overriding
or else not Has_Homonym
(S
) then
10023 if not Present
(Partial_View
) then
10027 -- Search through all the homonyms H of S in the current
10028 -- package spec, and return True if we find one that matches.
10029 -- Note that Parent (H) will be the declaration of the
10030 -- partial view of T for a match.
10033 H
: Entity_Id
:= S
;
10037 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
10041 N_Private_Extension_Declaration
,
10042 N_Private_Type_Declaration
)
10043 and then Defining_Identifier
(Parent
(H
)) = Partial_View
10051 end Overrides_Visible_Function
;
10053 -- Start of processing for Check_Private_Overriding
10056 if Is_Package_Or_Generic_Package
(Current_Scope
)
10057 and then In_Private_Part
(Current_Scope
)
10058 and then Visible_Part_Type
(T
)
10059 and then not In_Instance
10061 if Is_Abstract_Type
(T
)
10062 and then Is_Abstract_Subprogram
(S
)
10063 and then (not Is_Overriding
10064 or else not Is_Abstract_Subprogram
(E
)
10065 or else Overrides_Private_Part_Op
)
10068 ("abstract subprograms must be visible (RM 3.9.3(10))!",
10071 elsif Ekind
(S
) = E_Function
then
10073 Partial_View
: constant Entity_Id
:=
10074 Incomplete_Or_Partial_View
(T
);
10077 if not Overrides_Visible_Function
(Partial_View
) then
10079 -- Here, S is "function ... return T;" declared in
10080 -- the private part, not overriding some visible
10081 -- operation. That's illegal in the tagged case
10082 -- (but not if the private type is untagged).
10084 if ((Present
(Partial_View
)
10085 and then Is_Tagged_Type
(Partial_View
))
10086 or else (not Present
(Partial_View
)
10087 and then Is_Tagged_Type
(T
)))
10088 and then T
= Base_Type
(Etype
(S
))
10091 ("private function with tagged result must"
10092 & " override visible-part function", S
);
10094 ("\move subprogram to the visible part"
10095 & " (RM 3.9.3(10))", S
);
10097 -- AI05-0073: extend this test to the case of a
10098 -- function with a controlling access result.
10100 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
10101 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
10103 not Is_Class_Wide_Type
10104 (Designated_Type
(Etype
(S
)))
10105 and then Ada_Version
>= Ada_2012
10108 ("private function with controlling access "
10109 & "result must override visible-part function",
10112 ("\move subprogram to the visible part"
10113 & " (RM 3.9.3(10))", S
);
10119 end Check_Private_Overriding
;
10121 -----------------------
10122 -- Visible_Part_Type --
10123 -----------------------
10125 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
10126 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
10130 -- If the entity is a private type, then it must be declared in a
10133 if Ekind
(T
) in Private_Kind
then
10137 -- Otherwise, we traverse the visible part looking for its
10138 -- corresponding declaration. We cannot use the declaration
10139 -- node directly because in the private part the entity of a
10140 -- private type is the one in the full view, which does not
10141 -- indicate that it is the completion of something visible.
10143 N
:= First
(Visible_Declarations
(Specification
(P
)));
10144 while Present
(N
) loop
10145 if Nkind
(N
) = N_Full_Type_Declaration
10146 and then Present
(Defining_Identifier
(N
))
10147 and then T
= Defining_Identifier
(N
)
10151 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
10152 N_Private_Extension_Declaration
)
10153 and then Present
(Defining_Identifier
(N
))
10154 and then T
= Full_View
(Defining_Identifier
(N
))
10163 end Visible_Part_Type
;
10165 -- Start of processing for Check_For_Primitive_Subprogram
10168 Is_Primitive
:= False;
10170 if not Comes_From_Source
(S
) then
10173 -- If subprogram is at library level, it is not primitive operation
10175 elsif Current_Scope
= Standard_Standard
then
10178 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
10179 and then not In_Package_Body
(Current_Scope
))
10180 or else Is_Overriding
10182 -- For function, check return type
10184 if Ekind
(S
) = E_Function
then
10185 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
10186 F_Typ
:= Designated_Type
(Etype
(S
));
10188 F_Typ
:= Etype
(S
);
10191 B_Typ
:= Base_Type
(F_Typ
);
10193 if Scope
(B_Typ
) = Current_Scope
10194 and then not Is_Class_Wide_Type
(B_Typ
)
10195 and then not Is_Generic_Type
(B_Typ
)
10197 Is_Primitive
:= True;
10198 Set_Has_Primitive_Operations
(B_Typ
);
10199 Set_Is_Primitive
(S
);
10200 Check_Private_Overriding
(B_Typ
);
10202 -- The Ghost policy in effect at the point of declaration
10203 -- or a tagged type and a primitive operation must match
10204 -- (SPARK RM 6.9(16)).
10206 Check_Ghost_Primitive
(S
, B_Typ
);
10210 -- For all subprograms, check formals
10212 Formal
:= First_Formal
(S
);
10213 while Present
(Formal
) loop
10214 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
10215 F_Typ
:= Designated_Type
(Etype
(Formal
));
10217 F_Typ
:= Etype
(Formal
);
10220 B_Typ
:= Base_Type
(F_Typ
);
10222 if Ekind
(B_Typ
) = E_Access_Subtype
then
10223 B_Typ
:= Base_Type
(B_Typ
);
10226 if Scope
(B_Typ
) = Current_Scope
10227 and then not Is_Class_Wide_Type
(B_Typ
)
10228 and then not Is_Generic_Type
(B_Typ
)
10230 Is_Primitive
:= True;
10231 Set_Is_Primitive
(S
);
10232 Set_Has_Primitive_Operations
(B_Typ
);
10233 Check_Private_Overriding
(B_Typ
);
10235 -- The Ghost policy in effect at the point of declaration
10236 -- of a tagged type and a primitive operation must match
10237 -- (SPARK RM 6.9(16)).
10239 Check_Ghost_Primitive
(S
, B_Typ
);
10242 Next_Formal
(Formal
);
10245 -- Special case: An equality function can be redefined for a type
10246 -- occurring in a declarative part, and won't otherwise be treated as
10247 -- a primitive because it doesn't occur in a package spec and doesn't
10248 -- override an inherited subprogram. It's important that we mark it
10249 -- primitive so it can be returned by Collect_Primitive_Operations
10250 -- and be used in composing the equality operation of later types
10251 -- that have a component of the type.
10253 elsif Chars
(S
) = Name_Op_Eq
10254 and then Etype
(S
) = Standard_Boolean
10256 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
10258 if Scope
(B_Typ
) = Current_Scope
10260 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
10261 and then not Is_Limited_Type
(B_Typ
)
10263 Is_Primitive
:= True;
10264 Set_Is_Primitive
(S
);
10265 Set_Has_Primitive_Operations
(B_Typ
);
10266 Check_Private_Overriding
(B_Typ
);
10268 -- The Ghost policy in effect at the point of declaration of a
10269 -- tagged type and a primitive operation must match
10270 -- (SPARK RM 6.9(16)).
10272 Check_Ghost_Primitive
(S
, B_Typ
);
10275 end Check_For_Primitive_Subprogram
;
10277 --------------------------------------
10278 -- Has_Matching_Entry_Or_Subprogram --
10279 --------------------------------------
10281 function Has_Matching_Entry_Or_Subprogram
10282 (E
: Entity_Id
) return Boolean
10284 function Check_Conforming_Parameters
10285 (E1_Param
: Node_Id
;
10286 E2_Param
: Node_Id
) return Boolean;
10287 -- Starting from the given parameters, check that all the parameters
10288 -- of two entries or subprograms are subtype conformant. Used to skip
10289 -- the check on the controlling argument.
10291 function Matching_Entry_Or_Subprogram
10292 (Conc_Typ
: Entity_Id
;
10293 Subp
: Entity_Id
) return Entity_Id
;
10294 -- Return the first entry or subprogram of the given concurrent type
10295 -- whose name matches the name of Subp and has a profile conformant
10296 -- with Subp; return Empty if not found.
10298 function Matching_Dispatching_Subprogram
10299 (Conc_Typ
: Entity_Id
;
10300 Ent
: Entity_Id
) return Entity_Id
;
10301 -- Return the first dispatching primitive of Conc_Type defined in the
10302 -- enclosing scope of Conc_Type (i.e. before the full definition of
10303 -- this concurrent type) whose name matches the entry Ent and has a
10304 -- profile conformant with the profile of the corresponding (not yet
10305 -- built) dispatching primitive of Ent; return Empty if not found.
10307 function Matching_Original_Protected_Subprogram
10308 (Prot_Typ
: Entity_Id
;
10309 Subp
: Entity_Id
) return Entity_Id
;
10310 -- Return the first subprogram defined in the enclosing scope of
10311 -- Prot_Typ (before the full definition of this protected type)
10312 -- whose name matches the original name of Subp and has a profile
10313 -- conformant with the profile of Subp; return Empty if not found.
10315 ---------------------------------
10316 -- Check_Confirming_Parameters --
10317 ---------------------------------
10319 function Check_Conforming_Parameters
10320 (E1_Param
: Node_Id
;
10321 E2_Param
: Node_Id
) return Boolean
10323 Param_E1
: Node_Id
:= E1_Param
;
10324 Param_E2
: Node_Id
:= E2_Param
;
10327 while Present
(Param_E1
) and then Present
(Param_E2
) loop
10328 if Ekind
(Defining_Identifier
(Param_E1
)) /=
10329 Ekind
(Defining_Identifier
(Param_E2
))
10332 (Find_Parameter_Type
(Param_E1
),
10333 Find_Parameter_Type
(Param_E2
),
10334 Subtype_Conformant
)
10343 -- The candidate is not valid if one of the two lists contains
10344 -- more parameters than the other
10346 return No
(Param_E1
) and then No
(Param_E2
);
10347 end Check_Conforming_Parameters
;
10349 ----------------------------------
10350 -- Matching_Entry_Or_Subprogram --
10351 ----------------------------------
10353 function Matching_Entry_Or_Subprogram
10354 (Conc_Typ
: Entity_Id
;
10355 Subp
: Entity_Id
) return Entity_Id
10360 E
:= First_Entity
(Conc_Typ
);
10361 while Present
(E
) loop
10362 if Chars
(Subp
) = Chars
(E
)
10363 and then (Ekind
(E
) = E_Entry
or else Is_Subprogram
(E
))
10365 Check_Conforming_Parameters
10366 (First
(Parameter_Specifications
(Parent
(E
))),
10367 Next
(First
(Parameter_Specifications
(Parent
(Subp
)))))
10376 end Matching_Entry_Or_Subprogram
;
10378 -------------------------------------
10379 -- Matching_Dispatching_Subprogram --
10380 -------------------------------------
10382 function Matching_Dispatching_Subprogram
10383 (Conc_Typ
: Entity_Id
;
10384 Ent
: Entity_Id
) return Entity_Id
10389 -- Search for entities in the enclosing scope of this synchonized
10392 pragma Assert
(Is_Concurrent_Type
(Conc_Typ
));
10393 Push_Scope
(Scope
(Conc_Typ
));
10394 E
:= Current_Entity_In_Scope
(Ent
);
10397 while Present
(E
) loop
10398 if Scope
(E
) = Scope
(Conc_Typ
)
10399 and then Comes_From_Source
(E
)
10400 and then Ekind
(E
) = E_Procedure
10401 and then Present
(First_Entity
(E
))
10402 and then Is_Controlling_Formal
(First_Entity
(E
))
10403 and then Etype
(First_Entity
(E
)) = Conc_Typ
10405 Check_Conforming_Parameters
10406 (First
(Parameter_Specifications
(Parent
(Ent
))),
10407 Next
(First
(Parameter_Specifications
(Parent
(E
)))))
10416 end Matching_Dispatching_Subprogram
;
10418 --------------------------------------------
10419 -- Matching_Original_Protected_Subprogram --
10420 --------------------------------------------
10422 function Matching_Original_Protected_Subprogram
10423 (Prot_Typ
: Entity_Id
;
10424 Subp
: Entity_Id
) return Entity_Id
10426 ICF
: constant Boolean :=
10427 Is_Controlling_Formal
(First_Entity
(Subp
));
10431 -- Temporarily decorate the first parameter of Subp as controlling
10432 -- formal, required to invoke Subtype_Conformant.
10434 Set_Is_Controlling_Formal
(First_Entity
(Subp
));
10437 Current_Entity_In_Scope
(Original_Protected_Subprogram
(Subp
));
10439 while Present
(E
) loop
10440 if Scope
(E
) = Scope
(Prot_Typ
)
10441 and then Comes_From_Source
(E
)
10442 and then Ekind
(Subp
) = Ekind
(E
)
10443 and then Present
(First_Entity
(E
))
10444 and then Is_Controlling_Formal
(First_Entity
(E
))
10445 and then Etype
(First_Entity
(E
)) = Prot_Typ
10446 and then Subtype_Conformant
(Subp
, E
,
10447 Skip_Controlling_Formals
=> True)
10449 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10456 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10459 end Matching_Original_Protected_Subprogram
;
10461 -- Start of processing for Has_Matching_Entry_Or_Subprogram
10464 -- Case 1: E is a subprogram whose first formal is a concurrent type
10465 -- defined in the scope of E that has an entry or subprogram whose
10466 -- profile matches E.
10468 if Comes_From_Source
(E
)
10469 and then Is_Subprogram
(E
)
10470 and then Present
(First_Entity
(E
))
10471 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10474 Scope
(Corresponding_Concurrent_Type
10475 (Etype
(First_Entity
(E
))))
10478 (Matching_Entry_Or_Subprogram
10479 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10482 Report_Conflict
(E
,
10483 Matching_Entry_Or_Subprogram
10484 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10489 -- Case 2: E is an internally built dispatching subprogram of a
10490 -- protected type and there is a subprogram defined in the enclosing
10491 -- scope of the protected type that has the original name of E and
10492 -- its profile is conformant with the profile of E. We check the
10493 -- name of the original protected subprogram associated with E since
10494 -- the expander builds dispatching primitives of protected functions
10495 -- and procedures with other names (see Exp_Ch9.Build_Selected_Name).
10497 elsif not Comes_From_Source
(E
)
10498 and then Is_Subprogram
(E
)
10499 and then Present
(First_Entity
(E
))
10500 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10501 and then Present
(Original_Protected_Subprogram
(E
))
10504 (Matching_Original_Protected_Subprogram
10505 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10508 Report_Conflict
(E
,
10509 Matching_Original_Protected_Subprogram
10510 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10514 -- Case 3: E is an entry of a synchronized type and a matching
10515 -- procedure has been previously defined in the enclosing scope
10516 -- of the synchronized type.
10518 elsif Comes_From_Source
(E
)
10519 and then Ekind
(E
) = E_Entry
10521 Present
(Matching_Dispatching_Subprogram
(Current_Scope
, E
))
10523 Report_Conflict
(E
,
10524 Matching_Dispatching_Subprogram
(Current_Scope
, E
));
10529 end Has_Matching_Entry_Or_Subprogram
;
10531 ----------------------------
10532 -- Is_Private_Declaration --
10533 ----------------------------
10535 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
10536 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
10537 Priv_Decls
: List_Id
;
10540 if Is_Package_Or_Generic_Package
(Current_Scope
)
10541 and then In_Private_Part
(Current_Scope
)
10544 Private_Declarations
(Package_Specification
(Current_Scope
));
10546 return In_Package_Body
(Current_Scope
)
10548 (Is_List_Member
(Decl
)
10549 and then List_Containing
(Decl
) = Priv_Decls
)
10550 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
10552 Is_Compilation_Unit
10553 (Defining_Entity
(Parent
(Decl
)))
10554 and then List_Containing
(Parent
(Parent
(Decl
))) =
10559 end Is_Private_Declaration
;
10561 --------------------------
10562 -- Is_Overriding_Alias --
10563 --------------------------
10565 function Is_Overriding_Alias
10566 (Old_E
: Entity_Id
;
10567 New_E
: Entity_Id
) return Boolean
10569 AO
: constant Entity_Id
:= Alias
(Old_E
);
10570 AN
: constant Entity_Id
:= Alias
(New_E
);
10573 return Scope
(AO
) /= Scope
(AN
)
10574 or else No
(DTC_Entity
(AO
))
10575 or else No
(DTC_Entity
(AN
))
10576 or else DT_Position
(AO
) = DT_Position
(AN
);
10577 end Is_Overriding_Alias
;
10579 ---------------------
10580 -- Report_Conflict --
10581 ---------------------
10583 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
) is
10585 Error_Msg_Sloc
:= Sloc
(E
);
10587 -- Generate message, with useful additional warning if in generic
10589 if Is_Generic_Unit
(E
) then
10590 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
10591 Error_Msg_N
("\& conflicts with declaration#", S
);
10593 Error_Msg_N
("& conflicts with declaration#", S
);
10595 end Report_Conflict
;
10597 -- Start of processing for New_Overloaded_Entity
10600 -- We need to look for an entity that S may override. This must be a
10601 -- homonym in the current scope, so we look for the first homonym of
10602 -- S in the current scope as the starting point for the search.
10604 E
:= Current_Entity_In_Scope
(S
);
10606 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
10607 -- They are directly added to the list of primitive operations of
10608 -- Derived_Type, unless this is a rederivation in the private part
10609 -- of an operation that was already derived in the visible part of
10610 -- the current package.
10612 if Ada_Version
>= Ada_2005
10613 and then Present
(Derived_Type
)
10614 and then Present
(Alias
(S
))
10615 and then Is_Dispatching_Operation
(Alias
(S
))
10616 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
10617 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
10619 -- For private types, when the full-view is processed we propagate to
10620 -- the full view the non-overridden entities whose attribute "alias"
10621 -- references an interface primitive. These entities were added by
10622 -- Derive_Subprograms to ensure that interface primitives are
10625 -- Inside_Freeze_Actions is non zero when S corresponds with an
10626 -- internal entity that links an interface primitive with its
10627 -- covering primitive through attribute Interface_Alias (see
10628 -- Add_Internal_Interface_Entities).
10630 if Inside_Freezing_Actions
= 0
10631 and then Is_Package_Or_Generic_Package
(Current_Scope
)
10632 and then In_Private_Part
(Current_Scope
)
10633 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
10634 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
10635 and then Full_View
(Defining_Identifier
(Parent
(E
)))
10636 = Defining_Identifier
(Parent
(S
))
10637 and then Alias
(E
) = Alias
(S
)
10639 Check_Operation_From_Private_View
(S
, E
);
10640 Set_Is_Dispatching_Operation
(S
);
10645 Enter_Overloaded_Entity
(S
);
10646 Check_Dispatching_Operation
(S
, Empty
);
10647 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10653 -- For synchronized types check conflicts of this entity with previously
10654 -- defined entities.
10656 if Ada_Version
>= Ada_2005
10657 and then Has_Matching_Entry_Or_Subprogram
(S
)
10662 -- If there is no homonym then this is definitely not overriding
10665 Enter_Overloaded_Entity
(S
);
10666 Check_Dispatching_Operation
(S
, Empty
);
10667 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10669 -- If subprogram has an explicit declaration, check whether it has an
10670 -- overriding indicator.
10672 if Comes_From_Source
(S
) then
10673 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10675 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
10676 -- it may have overridden some hidden inherited primitive. Update
10677 -- Overridden_Subp to avoid spurious errors when checking the
10678 -- overriding indicator.
10680 if Ada_Version
>= Ada_2012
10681 and then No
(Overridden_Subp
)
10682 and then Is_Dispatching_Operation
(S
)
10683 and then Present
(Overridden_Operation
(S
))
10685 Overridden_Subp
:= Overridden_Operation
(S
);
10688 Check_Overriding_Indicator
10689 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
10691 -- The Ghost policy in effect at the point of declaration of a
10692 -- parent subprogram and an overriding subprogram must match
10693 -- (SPARK RM 6.9(17)).
10695 Check_Ghost_Overriding
(S
, Overridden_Subp
);
10698 -- If there is a homonym that is not overloadable, then we have an
10699 -- error, except for the special cases checked explicitly below.
10701 elsif not Is_Overloadable
(E
) then
10703 -- Check for spurious conflict produced by a subprogram that has the
10704 -- same name as that of the enclosing generic package. The conflict
10705 -- occurs within an instance, between the subprogram and the renaming
10706 -- declaration for the package. After the subprogram, the package
10707 -- renaming declaration becomes hidden.
10709 if Ekind
(E
) = E_Package
10710 and then Present
(Renamed_Object
(E
))
10711 and then Renamed_Object
(E
) = Current_Scope
10712 and then Nkind
(Parent
(Renamed_Object
(E
))) =
10713 N_Package_Specification
10714 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
10717 Set_Is_Immediately_Visible
(E
, False);
10718 Enter_Overloaded_Entity
(S
);
10719 Set_Homonym
(S
, Homonym
(E
));
10720 Check_Dispatching_Operation
(S
, Empty
);
10721 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
10723 -- If the subprogram is implicit it is hidden by the previous
10724 -- declaration. However if it is dispatching, it must appear in the
10725 -- dispatch table anyway, because it can be dispatched to even if it
10726 -- cannot be called directly.
10728 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
10729 Set_Scope
(S
, Current_Scope
);
10731 if Is_Dispatching_Operation
(Alias
(S
)) then
10732 Check_Dispatching_Operation
(S
, Empty
);
10738 Report_Conflict
(S
, E
);
10742 -- E exists and is overloadable
10745 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10747 -- Loop through E and its homonyms to determine if any of them is
10748 -- the candidate for overriding by S.
10750 while Present
(E
) loop
10752 -- Definitely not interesting if not in the current scope
10754 if Scope
(E
) /= Current_Scope
then
10757 -- A function can overload the name of an abstract state. The
10758 -- state can be viewed as a function with a profile that cannot
10759 -- be matched by anything.
10761 elsif Ekind
(S
) = E_Function
10762 and then Ekind
(E
) = E_Abstract_State
10764 Enter_Overloaded_Entity
(S
);
10767 -- Ada 2012 (AI05-0165): For internally generated bodies of null
10768 -- procedures locate the internally generated spec. We enforce
10769 -- mode conformance since a tagged type may inherit from
10770 -- interfaces several null primitives which differ only in
10771 -- the mode of the formals.
10773 elsif not Comes_From_Source
(S
)
10774 and then Is_Null_Procedure
(S
)
10775 and then not Mode_Conformant
(E
, S
)
10779 -- Check if we have type conformance
10781 elsif Type_Conformant
(E
, S
) then
10783 -- If the old and new entities have the same profile and one
10784 -- is not the body of the other, then this is an error, unless
10785 -- one of them is implicitly declared.
10787 -- There are some cases when both can be implicit, for example
10788 -- when both a literal and a function that overrides it are
10789 -- inherited in a derivation, or when an inherited operation
10790 -- of a tagged full type overrides the inherited operation of
10791 -- a private extension. Ada 83 had a special rule for the
10792 -- literal case. In Ada 95, the later implicit operation hides
10793 -- the former, and the literal is always the former. In the
10794 -- odd case where both are derived operations declared at the
10795 -- same point, both operations should be declared, and in that
10796 -- case we bypass the following test and proceed to the next
10797 -- part. This can only occur for certain obscure cases in
10798 -- instances, when an operation on a type derived from a formal
10799 -- private type does not override a homograph inherited from
10800 -- the actual. In subsequent derivations of such a type, the
10801 -- DT positions of these operations remain distinct, if they
10804 if Present
(Alias
(S
))
10805 and then (No
(Alias
(E
))
10806 or else Comes_From_Source
(E
)
10807 or else Is_Abstract_Subprogram
(S
)
10809 (Is_Dispatching_Operation
(E
)
10810 and then Is_Overriding_Alias
(E
, S
)))
10811 and then Ekind
(E
) /= E_Enumeration_Literal
10813 -- When an derived operation is overloaded it may be due to
10814 -- the fact that the full view of a private extension
10815 -- re-inherits. It has to be dealt with.
10817 if Is_Package_Or_Generic_Package
(Current_Scope
)
10818 and then In_Private_Part
(Current_Scope
)
10820 Check_Operation_From_Private_View
(S
, E
);
10823 -- In any case the implicit operation remains hidden by the
10824 -- existing declaration, which is overriding. Indicate that
10825 -- E overrides the operation from which S is inherited.
10827 if Present
(Alias
(S
)) then
10828 Set_Overridden_Operation
(E
, Alias
(S
));
10829 Inherit_Subprogram_Contract
(E
, Alias
(S
));
10832 Set_Overridden_Operation
(E
, S
);
10833 Inherit_Subprogram_Contract
(E
, S
);
10836 if Comes_From_Source
(E
) then
10837 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
10839 -- The Ghost policy in effect at the point of declaration
10840 -- of a parent subprogram and an overriding subprogram
10841 -- must match (SPARK RM 6.9(17)).
10843 Check_Ghost_Overriding
(E
, S
);
10848 -- Within an instance, the renaming declarations for actual
10849 -- subprograms may become ambiguous, but they do not hide each
10852 elsif Ekind
(E
) /= E_Entry
10853 and then not Comes_From_Source
(E
)
10854 and then not Is_Generic_Instance
(E
)
10855 and then (Present
(Alias
(E
))
10856 or else Is_Intrinsic_Subprogram
(E
))
10857 and then (not In_Instance
10858 or else No
(Parent
(E
))
10859 or else Nkind
(Unit_Declaration_Node
(E
)) /=
10860 N_Subprogram_Renaming_Declaration
)
10862 -- A subprogram child unit is not allowed to override an
10863 -- inherited subprogram (10.1.1(20)).
10865 if Is_Child_Unit
(S
) then
10867 ("child unit overrides inherited subprogram in parent",
10872 if Is_Non_Overriding_Operation
(E
, S
) then
10873 Enter_Overloaded_Entity
(S
);
10875 if No
(Derived_Type
)
10876 or else Is_Tagged_Type
(Derived_Type
)
10878 Check_Dispatching_Operation
(S
, Empty
);
10884 -- E is a derived operation or an internal operator which
10885 -- is being overridden. Remove E from further visibility.
10886 -- Furthermore, if E is a dispatching operation, it must be
10887 -- replaced in the list of primitive operations of its type
10888 -- (see Override_Dispatching_Operation).
10890 Overridden_Subp
:= E
;
10896 Prev
:= First_Entity
(Current_Scope
);
10897 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
10898 Next_Entity
(Prev
);
10901 -- It is possible for E to be in the current scope and
10902 -- yet not in the entity chain. This can only occur in a
10903 -- generic context where E is an implicit concatenation
10904 -- in the formal part, because in a generic body the
10905 -- entity chain starts with the formals.
10907 -- In GNATprove mode, a wrapper for an operation with
10908 -- axiomatization may be a homonym of another declaration
10909 -- for an actual subprogram (needs refinement ???).
10913 and then GNATprove_Mode
10915 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
10916 N_Subprogram_Renaming_Declaration
10920 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
10925 -- E must be removed both from the entity_list of the
10926 -- current scope, and from the visibility chain.
10928 if Debug_Flag_E
then
10929 Write_Str
("Override implicit operation ");
10930 Write_Int
(Int
(E
));
10934 -- If E is a predefined concatenation, it stands for four
10935 -- different operations. As a result, a single explicit
10936 -- declaration does not hide it. In a possible ambiguous
10937 -- situation, Disambiguate chooses the user-defined op,
10938 -- so it is correct to retain the previous internal one.
10940 if Chars
(E
) /= Name_Op_Concat
10941 or else Ekind
(E
) /= E_Operator
10943 -- For nondispatching derived operations that are
10944 -- overridden by a subprogram declared in the private
10945 -- part of a package, we retain the derived subprogram
10946 -- but mark it as not immediately visible. If the
10947 -- derived operation was declared in the visible part
10948 -- then this ensures that it will still be visible
10949 -- outside the package with the proper signature
10950 -- (calls from outside must also be directed to this
10951 -- version rather than the overriding one, unlike the
10952 -- dispatching case). Calls from inside the package
10953 -- will still resolve to the overriding subprogram
10954 -- since the derived one is marked as not visible
10955 -- within the package.
10957 -- If the private operation is dispatching, we achieve
10958 -- the overriding by keeping the implicit operation
10959 -- but setting its alias to be the overriding one. In
10960 -- this fashion the proper body is executed in all
10961 -- cases, but the original signature is used outside
10964 -- If the overriding is not in the private part, we
10965 -- remove the implicit operation altogether.
10967 if Is_Private_Declaration
(S
) then
10968 if not Is_Dispatching_Operation
(E
) then
10969 Set_Is_Immediately_Visible
(E
, False);
10971 -- Work done in Override_Dispatching_Operation,
10972 -- so nothing else needs to be done here.
10978 -- Find predecessor of E in Homonym chain
10980 if E
= Current_Entity
(E
) then
10983 Prev_Vis
:= Current_Entity
(E
);
10984 while Homonym
(Prev_Vis
) /= E
loop
10985 Prev_Vis
:= Homonym
(Prev_Vis
);
10989 if Prev_Vis
/= Empty
then
10991 -- Skip E in the visibility chain
10993 Set_Homonym
(Prev_Vis
, Homonym
(E
));
10996 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
10999 Set_Next_Entity
(Prev
, Next_Entity
(E
));
11001 if No
(Next_Entity
(Prev
)) then
11002 Set_Last_Entity
(Current_Scope
, Prev
);
11007 Enter_Overloaded_Entity
(S
);
11009 -- For entities generated by Derive_Subprograms the
11010 -- overridden operation is the inherited primitive
11011 -- (which is available through the attribute alias).
11013 if not (Comes_From_Source
(E
))
11014 and then Is_Dispatching_Operation
(E
)
11015 and then Find_Dispatching_Type
(E
) =
11016 Find_Dispatching_Type
(S
)
11017 and then Present
(Alias
(E
))
11018 and then Comes_From_Source
(Alias
(E
))
11020 Set_Overridden_Operation
(S
, Alias
(E
));
11021 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11023 -- Normal case of setting entity as overridden
11025 -- Note: Static_Initialization and Overridden_Operation
11026 -- attributes use the same field in subprogram entities.
11027 -- Static_Initialization is only defined for internal
11028 -- initialization procedures, where Overridden_Operation
11029 -- is irrelevant. Therefore the setting of this attribute
11030 -- must check whether the target is an init_proc.
11032 elsif not Is_Init_Proc
(S
) then
11033 Set_Overridden_Operation
(S
, E
);
11034 Inherit_Subprogram_Contract
(S
, E
);
11037 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
11039 -- The Ghost policy in effect at the point of declaration
11040 -- of a parent subprogram and an overriding subprogram
11041 -- must match (SPARK RM 6.9(17)).
11043 Check_Ghost_Overriding
(S
, E
);
11045 -- If S is a user-defined subprogram or a null procedure
11046 -- expanded to override an inherited null procedure, or a
11047 -- predefined dispatching primitive then indicate that E
11048 -- overrides the operation from which S is inherited.
11050 if Comes_From_Source
(S
)
11052 (Present
(Parent
(S
))
11054 Nkind
(Parent
(S
)) = N_Procedure_Specification
11056 Null_Present
(Parent
(S
)))
11058 (Present
(Alias
(E
))
11060 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
11062 if Present
(Alias
(E
)) then
11063 Set_Overridden_Operation
(S
, Alias
(E
));
11064 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11068 if Is_Dispatching_Operation
(E
) then
11070 -- An overriding dispatching subprogram inherits the
11071 -- convention of the overridden subprogram (AI-117).
11073 Set_Convention
(S
, Convention
(E
));
11074 Check_Dispatching_Operation
(S
, E
);
11077 Check_Dispatching_Operation
(S
, Empty
);
11080 Check_For_Primitive_Subprogram
11081 (Is_Primitive_Subp
, Is_Overriding
=> True);
11082 goto Check_Inequality
;
11085 -- Apparent redeclarations in instances can occur when two
11086 -- formal types get the same actual type. The subprograms in
11087 -- in the instance are legal, even if not callable from the
11088 -- outside. Calls from within are disambiguated elsewhere.
11089 -- For dispatching operations in the visible part, the usual
11090 -- rules apply, and operations with the same profile are not
11091 -- legal (B830001).
11093 elsif (In_Instance_Visible_Part
11094 and then not Is_Dispatching_Operation
(E
))
11095 or else In_Instance_Not_Visible
11099 -- Here we have a real error (identical profile)
11102 Error_Msg_Sloc
:= Sloc
(E
);
11104 -- Avoid cascaded errors if the entity appears in
11105 -- subsequent calls.
11107 Set_Scope
(S
, Current_Scope
);
11109 -- Generate error, with extra useful warning for the case
11110 -- of a generic instance with no completion.
11112 if Is_Generic_Instance
(S
)
11113 and then not Has_Completion
(E
)
11116 ("instantiation cannot provide body for&", S
);
11117 Error_Msg_N
("\& conflicts with declaration#", S
);
11119 Error_Msg_N
("& conflicts with declaration#", S
);
11126 -- If one subprogram has an access parameter and the other
11127 -- a parameter of an access type, calls to either might be
11128 -- ambiguous. Verify that parameters match except for the
11129 -- access parameter.
11131 if May_Hide_Profile
then
11137 F1
:= First_Formal
(S
);
11138 F2
:= First_Formal
(E
);
11139 while Present
(F1
) and then Present
(F2
) loop
11140 if Is_Access_Type
(Etype
(F1
)) then
11141 if not Is_Access_Type
(Etype
(F2
))
11142 or else not Conforming_Types
11143 (Designated_Type
(Etype
(F1
)),
11144 Designated_Type
(Etype
(F2
)),
11147 May_Hide_Profile
:= False;
11151 not Conforming_Types
11152 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
11154 May_Hide_Profile
:= False;
11161 if May_Hide_Profile
11165 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
11174 -- On exit, we know that S is a new entity
11176 Enter_Overloaded_Entity
(S
);
11177 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
11178 Check_Overriding_Indicator
11179 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
11181 -- The Ghost policy in effect at the point of declaration of a parent
11182 -- subprogram and an overriding subprogram must match
11183 -- (SPARK RM 6.9(17)).
11185 Check_Ghost_Overriding
(S
, Overridden_Subp
);
11187 -- Overloading is not allowed in SPARK, except for operators
11189 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
11190 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
11191 Check_SPARK_05_Restriction
11192 ("overloading not allowed with entity#", S
);
11195 -- If S is a derived operation for an untagged type then by
11196 -- definition it's not a dispatching operation (even if the parent
11197 -- operation was dispatching), so Check_Dispatching_Operation is not
11198 -- called in that case.
11200 if No
(Derived_Type
)
11201 or else Is_Tagged_Type
(Derived_Type
)
11203 Check_Dispatching_Operation
(S
, Empty
);
11207 -- If this is a user-defined equality operator that is not a derived
11208 -- subprogram, create the corresponding inequality. If the operation is
11209 -- dispatching, the expansion is done elsewhere, and we do not create
11210 -- an explicit inequality operation.
11212 <<Check_Inequality
>>
11213 if Chars
(S
) = Name_Op_Eq
11214 and then Etype
(S
) = Standard_Boolean
11215 and then Present
(Parent
(S
))
11216 and then not Is_Dispatching_Operation
(S
)
11218 Make_Inequality_Operator
(S
);
11219 Check_Untagged_Equality
(S
);
11221 end New_Overloaded_Entity
;
11223 ---------------------
11224 -- Process_Formals --
11225 ---------------------
11227 procedure Process_Formals
11229 Related_Nod
: Node_Id
)
11231 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
11232 -- Determine whether an access type designates a type coming from a
11235 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
11236 -- Check whether the default has a class-wide type. After analysis the
11237 -- default has the type of the formal, so we must also check explicitly
11238 -- for an access attribute.
11240 ----------------------------------
11241 -- Designates_From_Limited_With --
11242 ----------------------------------
11244 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
11245 Desig
: Entity_Id
:= Typ
;
11248 if Is_Access_Type
(Desig
) then
11249 Desig
:= Directly_Designated_Type
(Desig
);
11252 if Is_Class_Wide_Type
(Desig
) then
11253 Desig
:= Root_Type
(Desig
);
11257 Ekind
(Desig
) = E_Incomplete_Type
11258 and then From_Limited_With
(Desig
);
11259 end Designates_From_Limited_With
;
11261 ---------------------------
11262 -- Is_Class_Wide_Default --
11263 ---------------------------
11265 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
11267 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
11268 or else (Nkind
(D
) = N_Attribute_Reference
11269 and then Attribute_Name
(D
) = Name_Access
11270 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
11271 end Is_Class_Wide_Default
;
11275 Context
: constant Node_Id
:= Parent
(Parent
(T
));
11277 Formal
: Entity_Id
;
11278 Formal_Type
: Entity_Id
;
11279 Param_Spec
: Node_Id
;
11282 Num_Out_Params
: Nat
:= 0;
11283 First_Out_Param
: Entity_Id
:= Empty
;
11284 -- Used for setting Is_Only_Out_Parameter
11286 -- Start of processing for Process_Formals
11289 -- In order to prevent premature use of the formals in the same formal
11290 -- part, the Ekind is left undefined until all default expressions are
11291 -- analyzed. The Ekind is established in a separate loop at the end.
11293 Param_Spec
:= First
(T
);
11294 while Present
(Param_Spec
) loop
11295 Formal
:= Defining_Identifier
(Param_Spec
);
11296 Set_Never_Set_In_Source
(Formal
, True);
11297 Enter_Name
(Formal
);
11299 -- Case of ordinary parameters
11301 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
11302 Find_Type
(Parameter_Type
(Param_Spec
));
11303 Ptype
:= Parameter_Type
(Param_Spec
);
11305 if Ptype
= Error
then
11309 Formal_Type
:= Entity
(Ptype
);
11311 if Is_Incomplete_Type
(Formal_Type
)
11313 (Is_Class_Wide_Type
(Formal_Type
)
11314 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
11316 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
11317 -- primitive operations, as long as their completion is
11318 -- in the same declarative part. If in the private part
11319 -- this means that the type cannot be a Taft-amendment type.
11320 -- Check is done on package exit. For access to subprograms,
11321 -- the use is legal for Taft-amendment types.
11323 -- Ada 2012: tagged incomplete types are allowed as generic
11324 -- formal types. They do not introduce dependencies and the
11325 -- corresponding generic subprogram does not have a delayed
11326 -- freeze, because it does not need a freeze node. However,
11327 -- it is still the case that untagged incomplete types cannot
11328 -- be Taft-amendment types and must be completed in private
11329 -- part, so the subprogram must appear in the list of private
11330 -- dependents of the type.
11332 if Is_Tagged_Type
(Formal_Type
)
11333 or else (Ada_Version
>= Ada_2012
11334 and then not From_Limited_With
(Formal_Type
)
11335 and then not Is_Generic_Type
(Formal_Type
))
11337 if Ekind
(Scope
(Current_Scope
)) = E_Package
11338 and then not Is_Generic_Type
(Formal_Type
)
11339 and then not Is_Class_Wide_Type
(Formal_Type
)
11342 (Parent
(T
), N_Access_Function_Definition
,
11343 N_Access_Procedure_Definition
)
11345 Append_Elmt
(Current_Scope
,
11346 Private_Dependents
(Base_Type
(Formal_Type
)));
11348 -- Freezing is delayed to ensure that Register_Prim
11349 -- will get called for this operation, which is needed
11350 -- in cases where static dispatch tables aren't built.
11351 -- (Note that the same is done for controlling access
11352 -- parameter cases in function Access_Definition.)
11354 if not Is_Thunk
(Current_Scope
) then
11355 Set_Has_Delayed_Freeze
(Current_Scope
);
11360 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
11361 N_Access_Procedure_Definition
)
11363 -- AI05-0151: Tagged incomplete types are allowed in all
11364 -- formal parts. Untagged incomplete types are not allowed
11365 -- in bodies. Limited views of either kind are not allowed
11366 -- if there is no place at which the non-limited view can
11367 -- become available.
11369 -- Incomplete formal untagged types are not allowed in
11370 -- subprogram bodies (but are legal in their declarations).
11371 -- This excludes bodies created for null procedures, which
11372 -- are basic declarations.
11374 if Is_Generic_Type
(Formal_Type
)
11375 and then not Is_Tagged_Type
(Formal_Type
)
11376 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
11379 ("invalid use of formal incomplete type", Param_Spec
);
11381 elsif Ada_Version
>= Ada_2012
then
11382 if Is_Tagged_Type
(Formal_Type
)
11383 and then (not From_Limited_With
(Formal_Type
)
11384 or else not In_Package_Body
)
11388 elsif Nkind_In
(Context
, N_Accept_Statement
,
11389 N_Accept_Alternative
,
11391 or else (Nkind
(Context
) = N_Subprogram_Body
11392 and then Comes_From_Source
(Context
))
11395 ("invalid use of untagged incomplete type &",
11396 Ptype
, Formal_Type
);
11401 ("invalid use of incomplete type&",
11402 Param_Spec
, Formal_Type
);
11404 -- Further checks on the legality of incomplete types
11405 -- in formal parts are delayed until the freeze point
11406 -- of the enclosing subprogram or access to subprogram.
11410 elsif Ekind
(Formal_Type
) = E_Void
then
11412 ("premature use of&",
11413 Parameter_Type
(Param_Spec
), Formal_Type
);
11416 -- Ada 2012 (AI-142): Handle aliased parameters
11418 if Ada_Version
>= Ada_2012
11419 and then Aliased_Present
(Param_Spec
)
11421 Set_Is_Aliased
(Formal
);
11424 -- Ada 2005 (AI-231): Create and decorate an internal subtype
11425 -- declaration corresponding to the null-excluding type of the
11426 -- formal in the enclosing scope. Finally, replace the parameter
11427 -- type of the formal with the internal subtype.
11429 if Ada_Version
>= Ada_2005
11430 and then Null_Exclusion_Present
(Param_Spec
)
11432 if not Is_Access_Type
(Formal_Type
) then
11434 ("`NOT NULL` allowed only for an access type", Param_Spec
);
11437 if Can_Never_Be_Null
(Formal_Type
)
11438 and then Comes_From_Source
(Related_Nod
)
11441 ("`NOT NULL` not allowed (& already excludes null)",
11442 Param_Spec
, Formal_Type
);
11446 Create_Null_Excluding_Itype
11448 Related_Nod
=> Related_Nod
,
11449 Scope_Id
=> Scope
(Current_Scope
));
11451 -- If the designated type of the itype is an itype that is
11452 -- not frozen yet, we set the Has_Delayed_Freeze attribute
11453 -- on the access subtype, to prevent order-of-elaboration
11454 -- issues in the backend.
11457 -- type T is access procedure;
11458 -- procedure Op (O : not null T);
11460 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
11462 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
11464 Set_Has_Delayed_Freeze
(Formal_Type
);
11469 -- An access formal type
11473 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
11475 -- No need to continue if we already notified errors
11477 if not Present
(Formal_Type
) then
11481 -- Ada 2005 (AI-254)
11484 AD
: constant Node_Id
:=
11485 Access_To_Subprogram_Definition
11486 (Parameter_Type
(Param_Spec
));
11488 if Present
(AD
) and then Protected_Present
(AD
) then
11490 Replace_Anonymous_Access_To_Protected_Subprogram
11496 Set_Etype
(Formal
, Formal_Type
);
11498 -- Deal with default expression if present
11500 Default
:= Expression
(Param_Spec
);
11502 if Present
(Default
) then
11503 Check_SPARK_05_Restriction
11504 ("default expression is not allowed", Default
);
11506 if Out_Present
(Param_Spec
) then
11508 ("default initialization only allowed for IN parameters",
11512 -- Do the special preanalysis of the expression (see section on
11513 -- "Handling of Default Expressions" in the spec of package Sem).
11515 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
11517 -- An access to constant cannot be the default for
11518 -- an access parameter that is an access to variable.
11520 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11521 and then not Is_Access_Constant
(Formal_Type
)
11522 and then Is_Access_Type
(Etype
(Default
))
11523 and then Is_Access_Constant
(Etype
(Default
))
11526 ("formal that is access to variable cannot be initialized "
11527 & "with an access-to-constant expression", Default
);
11530 -- Check that the designated type of an access parameter's default
11531 -- is not a class-wide type unless the parameter's designated type
11532 -- is also class-wide.
11534 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11535 and then not Designates_From_Limited_With
(Formal_Type
)
11536 and then Is_Class_Wide_Default
(Default
)
11537 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
11540 ("access to class-wide expression not allowed here", Default
);
11543 -- Check incorrect use of dynamically tagged expressions
11545 if Is_Tagged_Type
(Formal_Type
) then
11546 Check_Dynamically_Tagged_Expression
11548 Typ
=> Formal_Type
,
11549 Related_Nod
=> Default
);
11553 -- Ada 2005 (AI-231): Static checks
11555 if Ada_Version
>= Ada_2005
11556 and then Is_Access_Type
(Etype
(Formal
))
11557 and then Can_Never_Be_Null
(Etype
(Formal
))
11559 Null_Exclusion_Static_Checks
(Param_Spec
);
11562 -- The following checks are relevant only when SPARK_Mode is on as
11563 -- these are not standard Ada legality rules.
11565 if SPARK_Mode
= On
then
11566 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
11568 -- A function cannot have a parameter of mode IN OUT or OUT
11571 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
11573 ("function cannot have parameter of mode `OUT` or "
11574 & "`IN OUT`", Formal
);
11577 -- A procedure cannot have an effectively volatile formal
11578 -- parameter of mode IN because it behaves as a constant
11579 -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4)
11581 elsif Ekind
(Scope
(Formal
)) = E_Procedure
11582 and then Ekind
(Formal
) = E_In_Parameter
11583 and then Is_Effectively_Volatile
(Formal
)
11586 ("formal parameter of mode `IN` cannot be volatile", Formal
);
11594 -- If this is the formal part of a function specification, analyze the
11595 -- subtype mark in the context where the formals are visible but not
11596 -- yet usable, and may hide outer homographs.
11598 if Nkind
(Related_Nod
) = N_Function_Specification
then
11599 Analyze_Return_Type
(Related_Nod
);
11602 -- Now set the kind (mode) of each formal
11604 Param_Spec
:= First
(T
);
11605 while Present
(Param_Spec
) loop
11606 Formal
:= Defining_Identifier
(Param_Spec
);
11607 Set_Formal_Mode
(Formal
);
11609 if Ekind
(Formal
) = E_In_Parameter
then
11610 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
11612 if Present
(Expression
(Param_Spec
)) then
11613 Default
:= Expression
(Param_Spec
);
11615 if Is_Scalar_Type
(Etype
(Default
)) then
11616 if Nkind
(Parameter_Type
(Param_Spec
)) /=
11617 N_Access_Definition
11619 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
11623 (Related_Nod
, Parameter_Type
(Param_Spec
));
11626 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
11630 elsif Ekind
(Formal
) = E_Out_Parameter
then
11631 Num_Out_Params
:= Num_Out_Params
+ 1;
11633 if Num_Out_Params
= 1 then
11634 First_Out_Param
:= Formal
;
11637 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
11638 Num_Out_Params
:= Num_Out_Params
+ 1;
11641 -- Skip remaining processing if formal type was in error
11643 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
11644 goto Next_Parameter
;
11647 -- Force call by reference if aliased
11650 Conv
: constant Convention_Id
:= Convention
(Etype
(Formal
));
11652 if Is_Aliased
(Formal
) then
11653 Set_Mechanism
(Formal
, By_Reference
);
11655 -- Warn if user asked this to be passed by copy
11657 if Conv
= Convention_Ada_Pass_By_Copy
then
11659 ("cannot pass aliased parameter & by copy??", Formal
);
11662 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
11664 elsif Conv
= Convention_Ada_Pass_By_Copy
then
11665 Set_Mechanism
(Formal
, By_Copy
);
11667 elsif Conv
= Convention_Ada_Pass_By_Reference
then
11668 Set_Mechanism
(Formal
, By_Reference
);
11676 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
11677 Set_Is_Only_Out_Parameter
(First_Out_Param
);
11679 end Process_Formals
;
11681 ----------------------------
11682 -- Reference_Body_Formals --
11683 ----------------------------
11685 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
11690 if Error_Posted
(Spec
) then
11694 -- Iterate over both lists. They may be of different lengths if the two
11695 -- specs are not conformant.
11697 Fs
:= First_Formal
(Spec
);
11698 Fb
:= First_Formal
(Bod
);
11699 while Present
(Fs
) and then Present
(Fb
) loop
11700 Generate_Reference
(Fs
, Fb
, 'b');
11702 if Style_Check
then
11703 Style
.Check_Identifier
(Fb
, Fs
);
11706 Set_Spec_Entity
(Fb
, Fs
);
11707 Set_Referenced
(Fs
, False);
11711 end Reference_Body_Formals
;
11713 -------------------------
11714 -- Set_Actual_Subtypes --
11715 -------------------------
11717 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
11719 Formal
: Entity_Id
;
11721 First_Stmt
: Node_Id
:= Empty
;
11722 AS_Needed
: Boolean;
11725 -- If this is an empty initialization procedure, no need to create
11726 -- actual subtypes (small optimization).
11728 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
11731 -- Within a predicate function we do not want to generate local
11732 -- subtypes that may generate nested predicate functions.
11734 elsif Is_Subprogram
(Subp
) and then Is_Predicate_Function
(Subp
) then
11738 -- The subtype declarations may freeze the formals. The body generated
11739 -- for an expression function is not a freeze point, so do not emit
11740 -- these declarations (small loss of efficiency in rare cases).
11742 if Nkind
(N
) = N_Subprogram_Body
11743 and then Was_Expression_Function
(N
)
11748 Formal
:= First_Formal
(Subp
);
11749 while Present
(Formal
) loop
11750 T
:= Etype
(Formal
);
11752 -- We never need an actual subtype for a constrained formal
11754 if Is_Constrained
(T
) then
11755 AS_Needed
:= False;
11757 -- If we have unknown discriminants, then we do not need an actual
11758 -- subtype, or more accurately we cannot figure it out. Note that
11759 -- all class-wide types have unknown discriminants.
11761 elsif Has_Unknown_Discriminants
(T
) then
11762 AS_Needed
:= False;
11764 -- At this stage we have an unconstrained type that may need an
11765 -- actual subtype. For sure the actual subtype is needed if we have
11766 -- an unconstrained array type. However, in an instance, the type
11767 -- may appear as a subtype of the full view, while the actual is
11768 -- in fact private (in which case no actual subtype is needed) so
11769 -- check the kind of the base type.
11771 elsif Is_Array_Type
(Base_Type
(T
)) then
11774 -- The only other case needing an actual subtype is an unconstrained
11775 -- record type which is an IN parameter (we cannot generate actual
11776 -- subtypes for the OUT or IN OUT case, since an assignment can
11777 -- change the discriminant values. However we exclude the case of
11778 -- initialization procedures, since discriminants are handled very
11779 -- specially in this context, see the section entitled "Handling of
11780 -- Discriminants" in Einfo.
11782 -- We also exclude the case of Discrim_SO_Functions (functions used
11783 -- in front-end layout mode for size/offset values), since in such
11784 -- functions only discriminants are referenced, and not only are such
11785 -- subtypes not needed, but they cannot always be generated, because
11786 -- of order of elaboration issues.
11788 elsif Is_Record_Type
(T
)
11789 and then Ekind
(Formal
) = E_In_Parameter
11790 and then Chars
(Formal
) /= Name_uInit
11791 and then not Is_Unchecked_Union
(T
)
11792 and then not Is_Discrim_SO_Function
(Subp
)
11796 -- All other cases do not need an actual subtype
11799 AS_Needed
:= False;
11802 -- Generate actual subtypes for unconstrained arrays and
11803 -- unconstrained discriminated records.
11806 if Nkind
(N
) = N_Accept_Statement
then
11808 -- If expansion is active, the formal is replaced by a local
11809 -- variable that renames the corresponding entry of the
11810 -- parameter block, and it is this local variable that may
11811 -- require an actual subtype.
11813 if Expander_Active
then
11814 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
11816 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11819 if Present
(Handled_Statement_Sequence
(N
)) then
11821 First
(Statements
(Handled_Statement_Sequence
(N
)));
11822 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
11823 Mark_Rewrite_Insertion
(Decl
);
11825 -- If the accept statement has no body, there will be no
11826 -- reference to the actuals, so no need to compute actual
11833 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11834 Prepend
(Decl
, Declarations
(N
));
11835 Mark_Rewrite_Insertion
(Decl
);
11838 -- The declaration uses the bounds of an existing object, and
11839 -- therefore needs no constraint checks.
11841 Analyze
(Decl
, Suppress
=> All_Checks
);
11842 Set_Is_Actual_Subtype
(Defining_Identifier
(Decl
));
11844 -- We need to freeze manually the generated type when it is
11845 -- inserted anywhere else than in a declarative part.
11847 if Present
(First_Stmt
) then
11848 Insert_List_Before_And_Analyze
(First_Stmt
,
11849 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11851 -- Ditto if the type has a dynamic predicate, because the
11852 -- generated function will mention the actual subtype. The
11853 -- predicate may come from an explicit aspect of be inherited.
11855 elsif Has_Predicates
(T
) then
11856 Insert_List_Before_And_Analyze
(Decl
,
11857 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11860 if Nkind
(N
) = N_Accept_Statement
11861 and then Expander_Active
11863 Set_Actual_Subtype
(Renamed_Object
(Formal
),
11864 Defining_Identifier
(Decl
));
11866 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
11870 Next_Formal
(Formal
);
11872 end Set_Actual_Subtypes
;
11874 ---------------------
11875 -- Set_Formal_Mode --
11876 ---------------------
11878 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
11879 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
11880 Id
: constant Entity_Id
:= Scope
(Formal_Id
);
11883 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
11884 -- since we ensure that corresponding actuals are always valid at the
11885 -- point of the call.
11887 if Out_Present
(Spec
) then
11888 if Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
11889 or else Is_Subprogram_Or_Generic_Subprogram
(Id
)
11891 Set_Has_Out_Or_In_Out_Parameter
(Id
, True);
11894 if Ekind_In
(Id
, E_Function
, E_Generic_Function
) then
11896 -- [IN] OUT parameters allowed for functions in Ada 2012
11898 if Ada_Version
>= Ada_2012
then
11900 -- Even in Ada 2012 operators can only have IN parameters
11902 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
11903 Error_Msg_N
("operators can only have IN parameters", Spec
);
11906 if In_Present
(Spec
) then
11907 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11909 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11912 -- But not in earlier versions of Ada
11915 Error_Msg_N
("functions can only have IN parameters", Spec
);
11916 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11919 elsif In_Present
(Spec
) then
11920 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11923 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11924 Set_Never_Set_In_Source
(Formal_Id
, True);
11925 Set_Is_True_Constant
(Formal_Id
, False);
11926 Set_Current_Value
(Formal_Id
, Empty
);
11930 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11933 -- Set Is_Known_Non_Null for access parameters since the language
11934 -- guarantees that access parameters are always non-null. We also set
11935 -- Can_Never_Be_Null, since there is no way to change the value.
11937 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
11939 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
11940 -- null; In Ada 2005, only if then null_exclusion is explicit.
11942 if Ada_Version
< Ada_2005
11943 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
11945 Set_Is_Known_Non_Null
(Formal_Id
);
11946 Set_Can_Never_Be_Null
(Formal_Id
);
11949 -- Ada 2005 (AI-231): Null-exclusion access subtype
11951 elsif Is_Access_Type
(Etype
(Formal_Id
))
11952 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
11954 Set_Is_Known_Non_Null
(Formal_Id
);
11956 -- We can also set Can_Never_Be_Null (thus preventing some junk
11957 -- access checks) for the case of an IN parameter, which cannot
11958 -- be changed, or for an IN OUT parameter, which can be changed but
11959 -- not to a null value. But for an OUT parameter, the initial value
11960 -- passed in can be null, so we can't set this flag in that case.
11962 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
11963 Set_Can_Never_Be_Null
(Formal_Id
);
11967 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
11968 Set_Formal_Validity
(Formal_Id
);
11969 end Set_Formal_Mode
;
11971 -------------------------
11972 -- Set_Formal_Validity --
11973 -------------------------
11975 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
11977 -- If no validity checking, then we cannot assume anything about the
11978 -- validity of parameters, since we do not know there is any checking
11979 -- of the validity on the call side.
11981 if not Validity_Checks_On
then
11984 -- If validity checking for parameters is enabled, this means we are
11985 -- not supposed to make any assumptions about argument values.
11987 elsif Validity_Check_Parameters
then
11990 -- If we are checking in parameters, we will assume that the caller is
11991 -- also checking parameters, so we can assume the parameter is valid.
11993 elsif Ekind
(Formal_Id
) = E_In_Parameter
11994 and then Validity_Check_In_Params
11996 Set_Is_Known_Valid
(Formal_Id
, True);
11998 -- Similar treatment for IN OUT parameters
12000 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
12001 and then Validity_Check_In_Out_Params
12003 Set_Is_Known_Valid
(Formal_Id
, True);
12005 end Set_Formal_Validity
;
12007 ------------------------
12008 -- Subtype_Conformant --
12009 ------------------------
12011 function Subtype_Conformant
12012 (New_Id
: Entity_Id
;
12013 Old_Id
: Entity_Id
;
12014 Skip_Controlling_Formals
: Boolean := False) return Boolean
12018 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
12019 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12021 end Subtype_Conformant
;
12023 ---------------------
12024 -- Type_Conformant --
12025 ---------------------
12027 function Type_Conformant
12028 (New_Id
: Entity_Id
;
12029 Old_Id
: Entity_Id
;
12030 Skip_Controlling_Formals
: Boolean := False) return Boolean
12034 May_Hide_Profile
:= False;
12036 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
12037 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12039 end Type_Conformant
;
12041 -------------------------------
12042 -- Valid_Operator_Definition --
12043 -------------------------------
12045 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
12048 Id
: constant Name_Id
:= Chars
(Designator
);
12052 F
:= First_Formal
(Designator
);
12053 while Present
(F
) loop
12056 if Present
(Default_Value
(F
)) then
12058 ("default values not allowed for operator parameters",
12061 -- For function instantiations that are operators, we must check
12062 -- separately that the corresponding generic only has in-parameters.
12063 -- For subprogram declarations this is done in Set_Formal_Mode. Such
12064 -- an error could not arise in earlier versions of the language.
12066 elsif Ekind
(F
) /= E_In_Parameter
then
12067 Error_Msg_N
("operators can only have IN parameters", F
);
12073 -- Verify that user-defined operators have proper number of arguments
12074 -- First case of operators which can only be unary
12076 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
12079 -- Case of operators which can be unary or binary
12081 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
12082 N_OK
:= (N
in 1 .. 2);
12084 -- All other operators can only be binary
12092 ("incorrect number of arguments for operator", Designator
);
12096 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
12097 and then not Is_Intrinsic_Subprogram
(Designator
)
12100 ("explicit definition of inequality not allowed", Designator
);
12102 end Valid_Operator_Definition
;