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.
448 Install_Formals
(Def_Id
);
450 Preanalyze_Spec_Expression
(Dup_Expr
, Etype
(Def_Id
));
453 -- Restore certain attributes of Def_Id since the preanalysis may
454 -- have introduced itypes to this scope, thus modifying attributes
455 -- First_Entity and Last_Entity.
457 Set_First_Entity
(Def_Id
, Saved_First_Entity
);
458 Set_Last_Entity
(Def_Id
, Saved_Last_Entity
);
460 if Present
(Last_Entity
(Def_Id
)) then
461 Set_Next_Entity
(Last_Entity
(Def_Id
), Empty
);
464 -- Freeze all types referenced in the expression
466 Freeze_References
(Dup_Expr
);
467 end Freeze_Expr_Types
;
477 Def_Id
: Entity_Id
:= Empty
;
479 -- If the expression is a completion, Prev is the entity whose
480 -- declaration is completed. Def_Id is needed to analyze the spec.
482 -- Start of processing for Analyze_Expression_Function
485 -- This is one of the occasions on which we transform the tree during
486 -- semantic analysis. If this is a completion, transform the expression
487 -- function into an equivalent subprogram body, and analyze it.
489 -- Expression functions are inlined unconditionally. The back-end will
490 -- determine whether this is possible.
492 Inline_Processing_Required
:= True;
494 -- Create a specification for the generated body. This must be done
495 -- prior to the analysis of the initial declaration.
497 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
498 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
500 -- If there are previous overloadable entities with the same name,
501 -- check whether any of them is completed by the expression function.
502 -- In a generic context a formal subprogram has no completion.
505 and then Is_Overloadable
(Prev
)
506 and then not Is_Formal_Subprogram
(Prev
)
508 Def_Id
:= Analyze_Subprogram_Specification
(Spec
);
509 Prev
:= Find_Corresponding_Spec
(N
);
511 -- The previous entity may be an expression function as well, in
512 -- which case the redeclaration is illegal.
515 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Prev
))) =
516 N_Expression_Function
518 Error_Msg_Sloc
:= Sloc
(Prev
);
519 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
524 Ret
:= Make_Simple_Return_Statement
(LocX
, Expr
);
527 Make_Subprogram_Body
(Loc
,
528 Specification
=> New_Spec
,
529 Declarations
=> Empty_List
,
530 Handled_Statement_Sequence
=>
531 Make_Handled_Sequence_Of_Statements
(LocX
,
532 Statements
=> New_List
(Ret
)));
533 Set_Was_Expression_Function
(New_Body
);
535 -- If the expression completes a generic subprogram, we must create a
536 -- separate node for the body, because at instantiation the original
537 -- node of the generic copy must be a generic subprogram body, and
538 -- cannot be a expression function. Otherwise we just rewrite the
539 -- expression with the non-generic body.
541 if Present
(Prev
) and then Ekind
(Prev
) = E_Generic_Function
then
542 Insert_After
(N
, New_Body
);
544 -- Propagate any aspects or pragmas that apply to the expression
545 -- function to the proper body when the expression function acts
548 if Has_Aspects
(N
) then
549 Move_Aspects
(N
, To
=> New_Body
);
552 Relocate_Pragmas_To_Body
(New_Body
);
554 Rewrite
(N
, Make_Null_Statement
(Loc
));
555 Set_Has_Completion
(Prev
, False);
558 Set_Is_Inlined
(Prev
);
560 -- If the expression function is a completion, the previous declaration
561 -- must come from source. We know already that it appears in the current
562 -- scope. The entity itself may be internally created if within a body
566 and then Is_Overloadable
(Prev
)
567 and then not Is_Formal_Subprogram
(Prev
)
568 and then Comes_From_Source
(Parent
(Prev
))
570 Set_Has_Completion
(Prev
, False);
571 Set_Is_Inlined
(Prev
);
573 -- AI12-0103: Expression functions that are a completion freeze their
574 -- expression but don't freeze anything else (unlike regular bodies).
576 -- Note that we cannot defer this freezing to the analysis of the
577 -- expression itself, because a freeze node might appear in a nested
578 -- scope, leading to an elaboration order issue in gigi.
579 -- As elsewhere, we do not emit freeze nodes within a generic unit.
581 if not Inside_A_Generic
then
582 Freeze_Expr_Types
(Def_Id
);
585 -- For navigation purposes, indicate that the function is a body
587 Generate_Reference
(Prev
, Defining_Entity
(N
), 'b', Force
=> True);
588 Rewrite
(N
, New_Body
);
590 -- Remove any existing aspects from the original node because the act
591 -- of rewriting causes the list to be shared between the two nodes.
593 Orig_N
:= Original_Node
(N
);
594 Remove_Aspects
(Orig_N
);
596 -- Propagate any pragmas that apply to expression function to the
597 -- proper body when the expression function acts as a completion.
598 -- Aspects are automatically transfered because of node rewriting.
600 Relocate_Pragmas_To_Body
(N
);
603 -- Once the aspects of the generated body have been analyzed, create
604 -- a copy for ASIS purposes and associate it with the original node.
606 if Has_Aspects
(N
) then
607 Set_Aspect_Specifications
(Orig_N
,
608 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
611 -- Prev is the previous entity with the same name, but it is can
612 -- be an unrelated spec that is not completed by the expression
613 -- function. In that case the relevant entity is the one in the body.
614 -- Not clear that the backend can inline it in this case ???
616 if Has_Completion
(Prev
) then
618 -- The formals of the expression function are body formals,
619 -- and do not appear in the ali file, which will only contain
620 -- references to the formals of the original subprogram spec.
627 F1
:= First_Formal
(Def_Id
);
628 F2
:= First_Formal
(Prev
);
630 while Present
(F1
) loop
631 Set_Spec_Entity
(F1
, F2
);
638 Set_Is_Inlined
(Defining_Entity
(New_Body
));
641 -- If this is not a completion, create both a declaration and a body, so
642 -- that the expression can be inlined whenever possible.
645 -- An expression function that is not a completion is not a
646 -- subprogram declaration, and thus cannot appear in a protected
649 if Nkind
(Parent
(N
)) = N_Protected_Definition
then
651 ("an expression function is not a legal protected operation", N
);
654 Rewrite
(N
, Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
));
656 -- Remove any existing aspects from the original node because the act
657 -- of rewriting causes the list to be shared between the two nodes.
659 Orig_N
:= Original_Node
(N
);
660 Remove_Aspects
(Orig_N
);
664 -- Once the aspects of the generated spec have been analyzed, create
665 -- a copy for ASIS purposes and associate it with the original node.
667 if Has_Aspects
(N
) then
668 Set_Aspect_Specifications
(Orig_N
,
669 New_Copy_List_Tree
(Aspect_Specifications
(N
)));
672 -- If aspect SPARK_Mode was specified on the body, it needs to be
673 -- repeated both on the generated spec and the body.
675 Asp
:= Find_Aspect
(Defining_Unit_Name
(Spec
), Aspect_SPARK_Mode
);
677 if Present
(Asp
) then
678 Asp
:= New_Copy_Tree
(Asp
);
679 Set_Analyzed
(Asp
, False);
680 Set_Aspect_Specifications
(New_Body
, New_List
(Asp
));
683 Def_Id
:= Defining_Entity
(N
);
684 Set_Is_Inlined
(Def_Id
);
686 -- Establish the linkages between the spec and the body. These are
687 -- used when the expression function acts as the prefix of attribute
688 -- 'Access in order to freeze the original expression which has been
689 -- moved to the generated body.
691 Set_Corresponding_Body
(N
, Defining_Entity
(New_Body
));
692 Set_Corresponding_Spec
(New_Body
, Def_Id
);
694 -- Within a generic pre-analyze the original expression for name
695 -- capture. The body is also generated but plays no role in
696 -- this because it is not part of the original source.
698 if Inside_A_Generic
then
699 Set_Has_Completion
(Def_Id
);
701 Install_Formals
(Def_Id
);
702 Preanalyze_Spec_Expression
(Expr
, Etype
(Def_Id
));
706 -- To prevent premature freeze action, insert the new body at the end
707 -- of the current declarations, or at the end of the package spec.
708 -- However, resolve usage names now, to prevent spurious visibility
709 -- on later entities. Note that the function can now be called in
710 -- the current declarative part, which will appear to be prior to
711 -- the presence of the body in the code. There are nevertheless no
712 -- order of elaboration issues because all name resolution has taken
713 -- place at the point of declaration.
716 Decls
: List_Id
:= List_Containing
(N
);
717 Expr
: constant Node_Id
:= Expression
(Ret
);
718 Par
: constant Node_Id
:= Parent
(Decls
);
719 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
722 -- If this is a wrapper created for in an instance for a formal
723 -- subprogram, insert body after declaration, to be analyzed when
724 -- the enclosing instance is analyzed.
727 and then Is_Generic_Actual_Subprogram
(Def_Id
)
729 Insert_After
(N
, New_Body
);
732 if Nkind
(Par
) = N_Package_Specification
733 and then Decls
= Visible_Declarations
(Par
)
734 and then Present
(Private_Declarations
(Par
))
735 and then not Is_Empty_List
(Private_Declarations
(Par
))
737 Decls
:= Private_Declarations
(Par
);
740 Insert_After
(Last
(Decls
), New_Body
);
742 -- Preanalyze the expression if not already done above
744 if not Inside_A_Generic
then
746 Install_Formals
(Def_Id
);
747 Preanalyze_Spec_Expression
(Expr
, Typ
);
748 Check_Limited_Return
(Original_Node
(N
), Expr
, Typ
);
755 -- Check incorrect use of dynamically tagged expression. This doesn't
756 -- fall out automatically when analyzing the generated function body,
757 -- because Check_Dynamically_Tagged_Expression deliberately ignores
758 -- nodes that don't come from source.
761 and then Nkind
(Def_Id
) in N_Has_Etype
762 and then Is_Tagged_Type
(Etype
(Def_Id
))
764 Check_Dynamically_Tagged_Expression
766 Typ
=> Etype
(Def_Id
),
767 Related_Nod
=> Original_Node
(N
));
770 -- If the return expression is a static constant, we suppress warning
771 -- messages on unused formals, which in most cases will be noise.
773 Set_Is_Trivial_Subprogram
774 (Defining_Entity
(New_Body
), Is_OK_Static_Expression
(Expr
));
775 end Analyze_Expression_Function
;
777 ----------------------------------------
778 -- Analyze_Extended_Return_Statement --
779 ----------------------------------------
781 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
783 Check_Compiler_Unit
("extended return statement", N
);
784 Analyze_Return_Statement
(N
);
785 end Analyze_Extended_Return_Statement
;
787 ----------------------------
788 -- Analyze_Function_Call --
789 ----------------------------
791 procedure Analyze_Function_Call
(N
: Node_Id
) is
792 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
793 Func_Nam
: constant Node_Id
:= Name
(N
);
799 -- A call of the form A.B (X) may be an Ada 2005 call, which is
800 -- rewritten as B (A, X). If the rewriting is successful, the call
801 -- has been analyzed and we just return.
803 if Nkind
(Func_Nam
) = N_Selected_Component
804 and then Name
(N
) /= Func_Nam
805 and then Is_Rewrite_Substitution
(N
)
806 and then Present
(Etype
(N
))
811 -- If error analyzing name, then set Any_Type as result type and return
813 if Etype
(Func_Nam
) = Any_Type
then
814 Set_Etype
(N
, Any_Type
);
818 -- Otherwise analyze the parameters
820 if Present
(Actuals
) then
821 Actual
:= First
(Actuals
);
822 while Present
(Actual
) loop
824 Check_Parameterless_Call
(Actual
);
830 end Analyze_Function_Call
;
832 -----------------------------
833 -- Analyze_Function_Return --
834 -----------------------------
836 procedure Analyze_Function_Return
(N
: Node_Id
) is
837 Loc
: constant Source_Ptr
:= Sloc
(N
);
838 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
839 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
841 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
842 -- Function result subtype
844 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
);
845 -- Apply legality rule of 6.5 (5.8) to the access discriminants of an
846 -- aggregate in a return statement.
848 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
849 -- Check that the return_subtype_indication properly matches the result
850 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
852 -----------------------------------
853 -- Check_Aggregate_Accessibility --
854 -----------------------------------
856 procedure Check_Aggregate_Accessibility
(Aggr
: Node_Id
) is
857 Typ
: constant Entity_Id
:= Etype
(Aggr
);
864 if Is_Record_Type
(Typ
) and then Has_Discriminants
(Typ
) then
865 Discr
:= First_Discriminant
(Typ
);
866 Assoc
:= First
(Component_Associations
(Aggr
));
867 while Present
(Discr
) loop
868 if Ekind
(Etype
(Discr
)) = E_Anonymous_Access_Type
then
869 Expr
:= Expression
(Assoc
);
871 if Nkind
(Expr
) = N_Attribute_Reference
872 and then Attribute_Name
(Expr
) /= Name_Unrestricted_Access
874 Obj
:= Prefix
(Expr
);
875 while Nkind_In
(Obj
, N_Indexed_Component
,
876 N_Selected_Component
)
881 -- Do not check aliased formals or function calls. A
882 -- run-time check may still be needed ???
884 if Is_Entity_Name
(Obj
)
885 and then Comes_From_Source
(Obj
)
887 if Is_Formal
(Entity
(Obj
))
888 and then Is_Aliased
(Entity
(Obj
))
892 elsif Object_Access_Level
(Obj
) >
893 Scope_Depth
(Scope
(Scope_Id
))
896 ("access discriminant in return aggregate would "
897 & "be a dangling reference", Obj
);
903 Next_Discriminant
(Discr
);
906 end Check_Aggregate_Accessibility
;
908 -------------------------------------
909 -- Check_Return_Subtype_Indication --
910 -------------------------------------
912 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
913 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
915 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
916 -- Subtype given in the extended return statement (must match R_Type)
918 Subtype_Ind
: constant Node_Id
:=
919 Object_Definition
(Original_Node
(Obj_Decl
));
921 procedure Error_No_Match
(N
: Node_Id
);
922 -- Output error messages for case where types do not statically
923 -- match. N is the location for the messages.
929 procedure Error_No_Match
(N
: Node_Id
) is
932 ("subtype must statically match function result subtype", N
);
934 if not Predicates_Match
(R_Stm_Type
, R_Type
) then
935 Error_Msg_Node_2
:= R_Type
;
937 ("\predicate of& does not match predicate of&",
942 -- Start of processing for Check_Return_Subtype_Indication
945 -- First, avoid cascaded errors
947 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
951 -- "return access T" case; check that the return statement also has
952 -- "access T", and that the subtypes statically match:
953 -- if this is an access to subprogram the signatures must match.
955 if Is_Anonymous_Access_Type
(R_Type
) then
956 if Is_Anonymous_Access_Type
(R_Stm_Type
) then
957 if Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
959 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
960 Base_Type
(Designated_Type
(R_Type
))
961 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
963 Error_No_Match
(Subtype_Mark
(Subtype_Ind
));
967 -- For two anonymous access to subprogram types, the types
968 -- themselves must be type conformant.
970 if not Conforming_Types
971 (R_Stm_Type
, R_Type
, Fully_Conformant
)
973 Error_No_Match
(Subtype_Ind
);
978 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
981 -- If the return object is of an anonymous access type, then report
982 -- an error if the function's result type is not also anonymous.
984 elsif Is_Anonymous_Access_Type
(R_Stm_Type
) then
985 pragma Assert
(not Is_Anonymous_Access_Type
(R_Type
));
987 ("anonymous access not allowed for function with named access "
988 & "result", Subtype_Ind
);
990 -- Subtype indication case: check that the return object's type is
991 -- covered by the result type, and that the subtypes statically match
992 -- when the result subtype is constrained. Also handle record types
993 -- with unknown discriminants for which we have built the underlying
994 -- record view. Coverage is needed to allow specific-type return
995 -- objects when the result type is class-wide (see AI05-32).
997 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
998 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
1001 (Base_Type
(R_Type
),
1002 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
1004 -- A null exclusion may be present on the return type, on the
1005 -- function specification, on the object declaration or on the
1008 if Is_Access_Type
(R_Type
)
1010 (Can_Never_Be_Null
(R_Type
)
1011 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
1012 Can_Never_Be_Null
(R_Stm_Type
)
1014 Error_No_Match
(Subtype_Ind
);
1017 -- AI05-103: for elementary types, subtypes must statically match
1019 if Is_Constrained
(R_Type
) or else Is_Access_Type
(R_Type
) then
1020 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
1021 Error_No_Match
(Subtype_Ind
);
1025 -- All remaining cases are illegal
1027 -- Note: previous versions of this subprogram allowed the return
1028 -- value to be the ancestor of the return type if the return type
1029 -- was a null extension. This was plainly incorrect.
1033 ("wrong type for return_subtype_indication", Subtype_Ind
);
1035 end Check_Return_Subtype_Indication
;
1037 ---------------------
1038 -- Local Variables --
1039 ---------------------
1042 Obj_Decl
: Node_Id
:= Empty
;
1044 -- Start of processing for Analyze_Function_Return
1047 Set_Return_Present
(Scope_Id
);
1049 if Nkind
(N
) = N_Simple_Return_Statement
then
1050 Expr
:= Expression
(N
);
1052 -- Guard against a malformed expression. The parser may have tried to
1053 -- recover but the node is not analyzable.
1055 if Nkind
(Expr
) = N_Error
then
1056 Set_Etype
(Expr
, Any_Type
);
1057 Expander_Mode_Save_And_Set
(False);
1061 -- The resolution of a controlled [extension] aggregate associated
1062 -- with a return statement creates a temporary which needs to be
1063 -- finalized on function exit. Wrap the return statement inside a
1064 -- block so that the finalization machinery can detect this case.
1065 -- This early expansion is done only when the return statement is
1066 -- not part of a handled sequence of statements.
1068 if Nkind_In
(Expr
, N_Aggregate
,
1069 N_Extension_Aggregate
)
1070 and then Needs_Finalization
(R_Type
)
1071 and then Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1074 Make_Block_Statement
(Loc
,
1075 Handled_Statement_Sequence
=>
1076 Make_Handled_Sequence_Of_Statements
(Loc
,
1077 Statements
=> New_List
(Relocate_Node
(N
)))));
1085 -- Ada 2005 (AI-251): If the type of the returned object is
1086 -- an access to an interface type then we add an implicit type
1087 -- conversion to force the displacement of the "this" pointer to
1088 -- reference the secondary dispatch table. We cannot delay the
1089 -- generation of this implicit conversion until the expansion
1090 -- because in this case the type resolution changes the decoration
1091 -- of the expression node to match R_Type; by contrast, if the
1092 -- returned object is a class-wide interface type then it is too
1093 -- early to generate here the implicit conversion since the return
1094 -- statement may be rewritten by the expander into an extended
1095 -- return statement whose expansion takes care of adding the
1096 -- implicit type conversion to displace the pointer to the object.
1099 and then Serious_Errors_Detected
= 0
1100 and then Is_Access_Type
(R_Type
)
1101 and then not Nkind_In
(Expr
, N_Null
, N_Raise_Expression
)
1102 and then Is_Interface
(Designated_Type
(R_Type
))
1103 and then Is_Progenitor
(Designated_Type
(R_Type
),
1104 Designated_Type
(Etype
(Expr
)))
1106 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1110 Resolve
(Expr
, R_Type
);
1111 Check_Limited_Return
(N
, Expr
, R_Type
);
1113 if Present
(Expr
) and then Nkind
(Expr
) = N_Aggregate
then
1114 Check_Aggregate_Accessibility
(Expr
);
1118 -- RETURN only allowed in SPARK as the last statement in function
1120 if Nkind
(Parent
(N
)) /= N_Handled_Sequence_Of_Statements
1122 (Nkind
(Parent
(Parent
(N
))) /= N_Subprogram_Body
1123 or else Present
(Next
(N
)))
1125 Check_SPARK_05_Restriction
1126 ("RETURN should be the last statement in function", N
);
1130 Check_SPARK_05_Restriction
("extended RETURN is not allowed", N
);
1131 Obj_Decl
:= Last
(Return_Object_Declarations
(N
));
1133 -- Analyze parts specific to extended_return_statement:
1136 Has_Aliased
: constant Boolean := Aliased_Present
(Obj_Decl
);
1137 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
1140 Expr
:= Expression
(Obj_Decl
);
1142 -- Note: The check for OK_For_Limited_Init will happen in
1143 -- Analyze_Object_Declaration; we treat it as a normal
1144 -- object declaration.
1146 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
1149 Check_Return_Subtype_Indication
(Obj_Decl
);
1151 if Present
(HSS
) then
1154 if Present
(Exception_Handlers
(HSS
)) then
1156 -- ???Has_Nested_Block_With_Handler needs to be set.
1157 -- Probably by creating an actual N_Block_Statement.
1158 -- Probably in Expand.
1164 -- Mark the return object as referenced, since the return is an
1165 -- implicit reference of the object.
1167 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
1169 Check_References
(Stm_Entity
);
1171 -- Check RM 6.5 (5.9/3)
1174 if Ada_Version
< Ada_2012
then
1176 -- Shouldn't this test Warn_On_Ada_2012_Compatibility ???
1177 -- Can it really happen (extended return???)
1180 ("aliased only allowed for limited return objects "
1181 & "in Ada 2012??", N
);
1183 elsif not Is_Limited_View
(R_Type
) then
1185 ("aliased only allowed for limited return objects", N
);
1191 -- Case of Expr present
1193 if Present
(Expr
) then
1195 -- Defend against previous errors
1197 if Nkind
(Expr
) = N_Empty
1198 or else No
(Etype
(Expr
))
1203 -- Apply constraint check. Note that this is done before the implicit
1204 -- conversion of the expression done for anonymous access types to
1205 -- ensure correct generation of the null-excluding check associated
1206 -- with null-excluding expressions found in return statements.
1208 Apply_Constraint_Check
(Expr
, R_Type
);
1210 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1211 -- type, apply an implicit conversion of the expression to that type
1212 -- to force appropriate static and run-time accessibility checks.
1214 if Ada_Version
>= Ada_2005
1215 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1217 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1218 Analyze_And_Resolve
(Expr
, R_Type
);
1220 -- If this is a local anonymous access to subprogram, the
1221 -- accessibility check can be applied statically. The return is
1222 -- illegal if the access type of the return expression is declared
1223 -- inside of the subprogram (except if it is the subtype indication
1224 -- of an extended return statement).
1226 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1227 if not Comes_From_Source
(Current_Scope
)
1228 or else Ekind
(Current_Scope
) = E_Return_Statement
1233 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1235 Error_Msg_N
("cannot return local access to subprogram", N
);
1238 -- The expression cannot be of a formal incomplete type
1240 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1241 and then Is_Generic_Type
(Etype
(Expr
))
1244 ("cannot return expression of a formal incomplete type", N
);
1247 -- If the result type is class-wide, then check that the return
1248 -- expression's type is not declared at a deeper level than the
1249 -- function (RM05-6.5(5.6/2)).
1251 if Ada_Version
>= Ada_2005
1252 and then Is_Class_Wide_Type
(R_Type
)
1254 if Type_Access_Level
(Etype
(Expr
)) >
1255 Subprogram_Access_Level
(Scope_Id
)
1258 ("level of return expression type is deeper than "
1259 & "class-wide function!", Expr
);
1263 -- Check incorrect use of dynamically tagged expression
1265 if Is_Tagged_Type
(R_Type
) then
1266 Check_Dynamically_Tagged_Expression
1272 -- ??? A real run-time accessibility check is needed in cases
1273 -- involving dereferences of access parameters. For now we just
1274 -- check the static cases.
1276 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1277 and then Is_Limited_View
(Etype
(Scope_Id
))
1278 and then Object_Access_Level
(Expr
) >
1279 Subprogram_Access_Level
(Scope_Id
)
1281 -- Suppress the message in a generic, where the rewriting
1284 if Inside_A_Generic
then
1289 Make_Raise_Program_Error
(Loc
,
1290 Reason
=> PE_Accessibility_Check_Failed
));
1293 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1294 Error_Msg_N
("cannot return a local value by reference<<", N
);
1295 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1299 if Known_Null
(Expr
)
1300 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1301 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1303 Apply_Compile_Time_Constraint_Error
1305 Msg
=> "(Ada 2005) null not allowed for "
1306 & "null-excluding return??",
1307 Reason
=> CE_Null_Not_Allowed
);
1310 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1311 -- has no initializing expression.
1313 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1314 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1315 Subprogram_Access_Level
(Scope_Id
)
1318 ("level of return expression type is deeper than "
1319 & "class-wide function!", Obj_Decl
);
1322 end Analyze_Function_Return
;
1324 -------------------------------------
1325 -- Analyze_Generic_Subprogram_Body --
1326 -------------------------------------
1328 procedure Analyze_Generic_Subprogram_Body
1332 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1333 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1334 Body_Id
: Entity_Id
;
1339 -- Copy body and disable expansion while analyzing the generic For a
1340 -- stub, do not copy the stub (which would load the proper body), this
1341 -- will be done when the proper body is analyzed.
1343 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1344 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1347 -- Once the contents of the generic copy and the template are
1348 -- swapped, do the same for their respective aspect specifications.
1350 Exchange_Aspects
(N
, New_N
);
1352 -- Collect all contract-related source pragmas found within the
1353 -- template and attach them to the contract of the subprogram body.
1354 -- This contract is used in the capture of global references within
1357 Create_Generic_Contract
(N
);
1362 Spec
:= Specification
(N
);
1364 -- Within the body of the generic, the subprogram is callable, and
1365 -- behaves like the corresponding non-generic unit.
1367 Body_Id
:= Defining_Entity
(Spec
);
1369 if Kind
= E_Generic_Procedure
1370 and then Nkind
(Spec
) /= N_Procedure_Specification
1372 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1375 elsif Kind
= E_Generic_Function
1376 and then Nkind
(Spec
) /= N_Function_Specification
1378 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1382 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1384 if Has_Completion
(Gen_Id
)
1385 and then Nkind
(Parent
(N
)) /= N_Subunit
1387 Error_Msg_N
("duplicate generic body", N
);
1390 Set_Has_Completion
(Gen_Id
);
1393 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1394 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1396 Set_Corresponding_Spec
(N
, Gen_Id
);
1399 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1400 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1403 -- Make generic parameters immediately visible in the body. They are
1404 -- needed to process the formals declarations. Then make the formals
1405 -- visible in a separate step.
1407 Push_Scope
(Gen_Id
);
1411 First_Ent
: Entity_Id
;
1414 First_Ent
:= First_Entity
(Gen_Id
);
1417 while Present
(E
) and then not Is_Formal
(E
) loop
1422 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1424 -- Now generic formals are visible, and the specification can be
1425 -- analyzed, for subsequent conformance check.
1427 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1429 -- Make formal parameters visible
1433 -- E is the first formal parameter, we loop through the formals
1434 -- installing them so that they will be visible.
1436 Set_First_Entity
(Gen_Id
, E
);
1437 while Present
(E
) loop
1443 -- Visible generic entity is callable within its own body
1445 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1446 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1447 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1448 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1449 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1451 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1453 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1455 -- No body to analyze, so restore state of generic unit
1457 Set_Ekind
(Gen_Id
, Kind
);
1458 Set_Ekind
(Body_Id
, Kind
);
1460 if Present
(First_Ent
) then
1461 Set_First_Entity
(Gen_Id
, First_Ent
);
1468 -- If this is a compilation unit, it must be made visible explicitly,
1469 -- because the compilation of the declaration, unlike other library
1470 -- unit declarations, does not. If it is not a unit, the following
1471 -- is redundant but harmless.
1473 Set_Is_Immediately_Visible
(Gen_Id
);
1474 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1476 if Is_Child_Unit
(Gen_Id
) then
1477 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1480 Set_Actual_Subtypes
(N
, Current_Scope
);
1482 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1483 Set_SPARK_Pragma_Inherited
(Body_Id
);
1485 -- Analyze any aspect specifications that appear on the generic
1488 if Has_Aspects
(N
) then
1489 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
1492 Analyze_Declarations
(Declarations
(N
));
1495 -- Process the contract of the subprogram body after all declarations
1496 -- have been analyzed. This ensures that any contract-related pragmas
1497 -- are available through the N_Contract node of the body.
1499 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
1501 Analyze
(Handled_Statement_Sequence
(N
));
1502 Save_Global_References
(Original_Node
(N
));
1504 -- Prior to exiting the scope, include generic formals again (if any
1505 -- are present) in the set of local entities.
1507 if Present
(First_Ent
) then
1508 Set_First_Entity
(Gen_Id
, First_Ent
);
1511 Check_References
(Gen_Id
);
1514 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1515 Update_Use_Clause_Chain
;
1516 Validate_Categorization_Dependency
(N
, Gen_Id
);
1518 Check_Subprogram_Order
(N
);
1520 -- Outside of its body, unit is generic again
1522 Set_Ekind
(Gen_Id
, Kind
);
1523 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1526 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1530 end Analyze_Generic_Subprogram_Body
;
1532 ----------------------------
1533 -- Analyze_Null_Procedure --
1534 ----------------------------
1536 procedure Analyze_Null_Procedure
1538 Is_Completion
: out Boolean)
1540 Loc
: constant Source_Ptr
:= Sloc
(N
);
1541 Spec
: constant Node_Id
:= Specification
(N
);
1542 Designator
: Entity_Id
;
1544 Null_Body
: Node_Id
:= Empty
;
1545 Null_Stmt
: Node_Id
:= Null_Statement
(Spec
);
1549 -- Capture the profile of the null procedure before analysis, for
1550 -- expansion at the freeze point and at each point of call. The body is
1551 -- used if the procedure has preconditions, or if it is a completion. In
1552 -- the first case the body is analyzed at the freeze point, in the other
1553 -- it replaces the null procedure declaration.
1555 -- For a null procedure that comes from source, a NULL statement is
1556 -- provided by the parser, which carries the source location of the
1557 -- NULL keyword, and has Comes_From_Source set. For a null procedure
1558 -- from expansion, create one now.
1560 if No
(Null_Stmt
) then
1561 Null_Stmt
:= Make_Null_Statement
(Loc
);
1565 Make_Subprogram_Body
(Loc
,
1566 Specification
=> New_Copy_Tree
(Spec
),
1567 Declarations
=> New_List
,
1568 Handled_Statement_Sequence
=>
1569 Make_Handled_Sequence_Of_Statements
(Loc
,
1570 Statements
=> New_List
(Null_Stmt
)));
1572 -- Create new entities for body and formals
1574 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1575 Make_Defining_Identifier
1576 (Sloc
(Defining_Entity
(N
)),
1577 Chars
(Defining_Entity
(N
))));
1579 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1580 while Present
(Form
) loop
1581 Set_Defining_Identifier
(Form
,
1582 Make_Defining_Identifier
1583 (Sloc
(Defining_Identifier
(Form
)),
1584 Chars
(Defining_Identifier
(Form
))));
1588 -- Determine whether the null procedure may be a completion of a generic
1589 -- suprogram, in which case we use the new null body as the completion
1590 -- and set minimal semantic information on the original declaration,
1591 -- which is rewritten as a null statement.
1593 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1595 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1596 Insert_Before
(N
, Null_Body
);
1597 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1599 Rewrite
(N
, Make_Null_Statement
(Loc
));
1600 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1601 Is_Completion
:= True;
1605 -- Resolve the types of the formals now, because the freeze point may
1606 -- appear in a different context, e.g. an instantiation.
1608 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1609 while Present
(Form
) loop
1610 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1611 Find_Type
(Parameter_Type
(Form
));
1613 elsif No
(Access_To_Subprogram_Definition
1614 (Parameter_Type
(Form
)))
1616 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1618 -- The case of a null procedure with a formal that is an
1619 -- access-to-subprogram type, and that is used as an actual
1620 -- in an instantiation is left to the enthusiastic reader.
1630 -- If there are previous overloadable entities with the same name, check
1631 -- whether any of them is completed by the null procedure.
1633 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1634 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1635 Prev
:= Find_Corresponding_Spec
(N
);
1638 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1639 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1640 Set_Has_Completion
(Designator
);
1642 -- Signal to caller that this is a procedure declaration
1644 Is_Completion
:= False;
1646 -- Null procedures are always inlined, but generic formal subprograms
1647 -- which appear as such in the internal instance of formal packages,
1648 -- need no completion and are not marked Inline.
1651 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1653 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1654 Set_Body_To_Inline
(N
, Null_Body
);
1655 Set_Is_Inlined
(Designator
);
1659 -- The null procedure is a completion. We unconditionally rewrite
1660 -- this as a null body (even if expansion is not active), because
1661 -- there are various error checks that are applied on this body
1662 -- when it is analyzed (e.g. correct aspect placement).
1664 if Has_Completion
(Prev
) then
1665 Error_Msg_Sloc
:= Sloc
(Prev
);
1666 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1669 Check_Previous_Null_Procedure
(N
, Prev
);
1671 Is_Completion
:= True;
1672 Rewrite
(N
, Null_Body
);
1675 end Analyze_Null_Procedure
;
1677 -----------------------------
1678 -- Analyze_Operator_Symbol --
1679 -----------------------------
1681 -- An operator symbol such as "+" or "and" may appear in context where the
1682 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1683 -- is just a string, as in (conjunction = "or"). In these cases the parser
1684 -- generates this node, and the semantics does the disambiguation. Other
1685 -- such case are actuals in an instantiation, the generic unit in an
1686 -- instantiation, and pragma arguments.
1688 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1689 Par
: constant Node_Id
:= Parent
(N
);
1692 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1693 or else Nkind
(Par
) = N_Function_Instantiation
1694 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1695 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1696 and then not Is_Pragma_String_Literal
(Par
))
1697 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1698 or else (Nkind
(Par
) = N_Attribute_Reference
1699 and then Attribute_Name
(Par
) /= Name_Value
)
1701 Find_Direct_Name
(N
);
1704 Change_Operator_Symbol_To_String_Literal
(N
);
1707 end Analyze_Operator_Symbol
;
1709 -----------------------------------
1710 -- Analyze_Parameter_Association --
1711 -----------------------------------
1713 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1715 Analyze
(Explicit_Actual_Parameter
(N
));
1716 end Analyze_Parameter_Association
;
1718 ----------------------------
1719 -- Analyze_Procedure_Call --
1720 ----------------------------
1722 -- WARNING: This routine manages Ghost regions. Return statements must be
1723 -- replaced by gotos which jump to the end of the routine and restore the
1726 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1727 procedure Analyze_Call_And_Resolve
;
1728 -- Do Analyze and Resolve calls for procedure call. At the end, check
1729 -- for illegal order dependence.
1730 -- ??? where is the check for illegal order dependencies?
1732 ------------------------------
1733 -- Analyze_Call_And_Resolve --
1734 ------------------------------
1736 procedure Analyze_Call_And_Resolve
is
1738 if Nkind
(N
) = N_Procedure_Call_Statement
then
1740 Resolve
(N
, Standard_Void_Type
);
1744 end Analyze_Call_And_Resolve
;
1748 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1749 Loc
: constant Source_Ptr
:= Sloc
(N
);
1750 P
: constant Node_Id
:= Name
(N
);
1752 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1753 -- Save the Ghost mode to restore on exit
1758 -- Start of processing for Analyze_Procedure_Call
1761 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1762 -- a procedure call or an entry call. The prefix may denote an access
1763 -- to subprogram type, in which case an implicit dereference applies.
1764 -- If the prefix is an indexed component (without implicit dereference)
1765 -- then the construct denotes a call to a member of an entire family.
1766 -- If the prefix is a simple name, it may still denote a call to a
1767 -- parameterless member of an entry family. Resolution of these various
1768 -- interpretations is delicate.
1770 -- Do not analyze machine code statements to avoid rejecting them in
1773 if CodePeer_Mode
and then Nkind
(P
) = N_Qualified_Expression
then
1774 Set_Etype
(P
, Standard_Void_Type
);
1779 -- If this is a call of the form Obj.Op, the call may have been analyzed
1780 -- and possibly rewritten into a block, in which case we are done.
1782 if Analyzed
(N
) then
1785 -- If there is an error analyzing the name (which may have been
1786 -- rewritten if the original call was in prefix notation) then error
1787 -- has been emitted already, mark node and return.
1789 elsif Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1790 Set_Etype
(N
, Any_Type
);
1794 -- A procedure call is Ghost when its name denotes a Ghost procedure.
1795 -- Set the mode now to ensure that any nodes generated during analysis
1796 -- and expansion are properly marked as Ghost.
1798 Mark_And_Set_Ghost_Procedure_Call
(N
);
1800 -- Otherwise analyze the parameters
1802 if Present
(Actuals
) then
1803 Actual
:= First
(Actuals
);
1805 while Present
(Actual
) loop
1807 Check_Parameterless_Call
(Actual
);
1812 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1814 if Nkind
(P
) = N_Attribute_Reference
1815 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1817 Name_Elab_Subp_Body
)
1819 if Present
(Actuals
) then
1821 ("no parameters allowed for this call", First
(Actuals
));
1825 Set_Etype
(N
, Standard_Void_Type
);
1828 elsif Is_Entity_Name
(P
)
1829 and then Is_Record_Type
(Etype
(Entity
(P
)))
1830 and then Remote_AST_I_Dereference
(P
)
1834 elsif Is_Entity_Name
(P
)
1835 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1837 if Is_Access_Type
(Etype
(P
))
1838 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1839 and then No
(Actuals
)
1840 and then Comes_From_Source
(N
)
1842 Error_Msg_N
("missing explicit dereference in call", N
);
1845 Analyze_Call_And_Resolve
;
1847 -- If the prefix is the simple name of an entry family, this is a
1848 -- parameterless call from within the task body itself.
1850 elsif Is_Entity_Name
(P
)
1851 and then Nkind
(P
) = N_Identifier
1852 and then Ekind
(Entity
(P
)) = E_Entry_Family
1853 and then Present
(Actuals
)
1854 and then No
(Next
(First
(Actuals
)))
1856 -- Can be call to parameterless entry family. What appears to be the
1857 -- sole argument is in fact the entry index. Rewrite prefix of node
1858 -- accordingly. Source representation is unchanged by this
1862 Make_Indexed_Component
(Loc
,
1864 Make_Selected_Component
(Loc
,
1865 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1866 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1867 Expressions
=> Actuals
);
1868 Set_Name
(N
, New_N
);
1869 Set_Etype
(New_N
, Standard_Void_Type
);
1870 Set_Parameter_Associations
(N
, No_List
);
1871 Analyze_Call_And_Resolve
;
1873 elsif Nkind
(P
) = N_Explicit_Dereference
then
1874 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1875 Analyze_Call_And_Resolve
;
1877 Error_Msg_N
("expect access to procedure in call", P
);
1880 -- The name can be a selected component or an indexed component that
1881 -- yields an access to subprogram. Such a prefix is legal if the call
1882 -- has parameter associations.
1884 elsif Is_Access_Type
(Etype
(P
))
1885 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1887 if Present
(Actuals
) then
1888 Analyze_Call_And_Resolve
;
1890 Error_Msg_N
("missing explicit dereference in call ", N
);
1893 -- If not an access to subprogram, then the prefix must resolve to the
1894 -- name of an entry, entry family, or protected operation.
1896 -- For the case of a simple entry call, P is a selected component where
1897 -- the prefix is the task and the selector name is the entry. A call to
1898 -- a protected procedure will have the same syntax. If the protected
1899 -- object contains overloaded operations, the entity may appear as a
1900 -- function, the context will select the operation whose type is Void.
1902 elsif Nkind
(P
) = N_Selected_Component
1903 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1907 -- When front-end inlining is enabled, as with SPARK_Mode, a call
1908 -- in prefix notation may still be missing its controlling argument,
1909 -- so perform the transformation now.
1911 if SPARK_Mode
= On
and then In_Inlined_Body
then
1913 Subp
: constant Entity_Id
:= Entity
(Selector_Name
(P
));
1914 Typ
: constant Entity_Id
:= Etype
(Prefix
(P
));
1917 if Is_Tagged_Type
(Typ
)
1918 and then Present
(First_Formal
(Subp
))
1919 and then Etype
(First_Formal
(Subp
)) = Typ
1920 and then Try_Object_Operation
(P
)
1925 Analyze_Call_And_Resolve
;
1930 Analyze_Call_And_Resolve
;
1933 elsif Nkind
(P
) = N_Selected_Component
1934 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1935 and then Present
(Actuals
)
1936 and then No
(Next
(First
(Actuals
)))
1938 -- Can be call to parameterless entry family. What appears to be the
1939 -- sole argument is in fact the entry index. Rewrite prefix of node
1940 -- accordingly. Source representation is unchanged by this
1944 Make_Indexed_Component
(Loc
,
1945 Prefix
=> New_Copy
(P
),
1946 Expressions
=> Actuals
);
1947 Set_Name
(N
, New_N
);
1948 Set_Etype
(New_N
, Standard_Void_Type
);
1949 Set_Parameter_Associations
(N
, No_List
);
1950 Analyze_Call_And_Resolve
;
1952 -- For the case of a reference to an element of an entry family, P is
1953 -- an indexed component whose prefix is a selected component (task and
1954 -- entry family), and whose index is the entry family index.
1956 elsif Nkind
(P
) = N_Indexed_Component
1957 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1958 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1960 Analyze_Call_And_Resolve
;
1962 -- If the prefix is the name of an entry family, it is a call from
1963 -- within the task body itself.
1965 elsif Nkind
(P
) = N_Indexed_Component
1966 and then Nkind
(Prefix
(P
)) = N_Identifier
1967 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1970 Make_Selected_Component
(Loc
,
1972 New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1973 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1974 Rewrite
(Prefix
(P
), New_N
);
1976 Analyze_Call_And_Resolve
;
1978 -- In Ada 2012. a qualified expression is a name, but it cannot be a
1979 -- procedure name, so the construct can only be a qualified expression.
1981 elsif Nkind
(P
) = N_Qualified_Expression
1982 and then Ada_Version
>= Ada_2012
1984 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
1987 -- Anything else is an error
1990 Error_Msg_N
("invalid procedure or entry call", N
);
1994 Restore_Ghost_Mode
(Saved_GM
);
1995 end Analyze_Procedure_Call
;
1997 ------------------------------
1998 -- Analyze_Return_Statement --
1999 ------------------------------
2001 procedure Analyze_Return_Statement
(N
: Node_Id
) is
2002 pragma Assert
(Nkind_In
(N
, N_Extended_Return_Statement
,
2003 N_Simple_Return_Statement
));
2005 Returns_Object
: constant Boolean :=
2006 Nkind
(N
) = N_Extended_Return_Statement
2008 (Nkind
(N
) = N_Simple_Return_Statement
2009 and then Present
(Expression
(N
)));
2010 -- True if we're returning something; that is, "return <expression>;"
2011 -- or "return Result : T [:= ...]". False for "return;". Used for error
2012 -- checking: If Returns_Object is True, N should apply to a function
2013 -- body; otherwise N should apply to a procedure body, entry body,
2014 -- accept statement, or extended return statement.
2016 function Find_What_It_Applies_To
return Entity_Id
;
2017 -- Find the entity representing the innermost enclosing body, accept
2018 -- statement, or extended return statement. If the result is a callable
2019 -- construct or extended return statement, then this will be the value
2020 -- of the Return_Applies_To attribute. Otherwise, the program is
2021 -- illegal. See RM-6.5(4/2).
2023 -----------------------------
2024 -- Find_What_It_Applies_To --
2025 -----------------------------
2027 function Find_What_It_Applies_To
return Entity_Id
is
2028 Result
: Entity_Id
:= Empty
;
2031 -- Loop outward through the Scope_Stack, skipping blocks, loops,
2032 -- and postconditions.
2034 for J
in reverse 0 .. Scope_Stack
.Last
loop
2035 Result
:= Scope_Stack
.Table
(J
).Entity
;
2036 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
2037 and then Chars
(Result
) /= Name_uPostconditions
;
2040 pragma Assert
(Present
(Result
));
2042 end Find_What_It_Applies_To
;
2044 -- Local declarations
2046 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
2047 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
2048 Loc
: constant Source_Ptr
:= Sloc
(N
);
2049 Stm_Entity
: constant Entity_Id
:=
2051 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
2053 -- Start of processing for Analyze_Return_Statement
2056 Set_Return_Statement_Entity
(N
, Stm_Entity
);
2058 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
2059 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
2061 -- Place Return entity on scope stack, to simplify enforcement of 6.5
2062 -- (4/2): an inner return statement will apply to this extended return.
2064 if Nkind
(N
) = N_Extended_Return_Statement
then
2065 Push_Scope
(Stm_Entity
);
2068 -- Check that pragma No_Return is obeyed. Don't complain about the
2069 -- implicitly-generated return that is placed at the end.
2071 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
2072 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
2075 -- Warn on any unassigned OUT parameters if in procedure
2077 if Ekind
(Scope_Id
) = E_Procedure
then
2078 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
2081 -- Check that functions return objects, and other things do not
2083 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
2084 if not Returns_Object
then
2085 Error_Msg_N
("missing expression in return from function", N
);
2088 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
2089 if Returns_Object
then
2090 Error_Msg_N
("procedure cannot return value (use function)", N
);
2093 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
2094 if Returns_Object
then
2095 if Is_Protected_Type
(Scope
(Scope_Id
)) then
2096 Error_Msg_N
("entry body cannot return value", N
);
2098 Error_Msg_N
("accept statement cannot return value", N
);
2102 elsif Kind
= E_Return_Statement
then
2104 -- We are nested within another return statement, which must be an
2105 -- extended_return_statement.
2107 if Returns_Object
then
2108 if Nkind
(N
) = N_Extended_Return_Statement
then
2110 ("extended return statement cannot be nested (use `RETURN;`)",
2113 -- Case of a simple return statement with a value inside extended
2114 -- return statement.
2118 ("return nested in extended return statement cannot return "
2119 & "value (use `RETURN;`)", N
);
2124 Error_Msg_N
("illegal context for return statement", N
);
2127 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
2128 Analyze_Function_Return
(N
);
2130 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
2131 Set_Return_Present
(Scope_Id
);
2134 if Nkind
(N
) = N_Extended_Return_Statement
then
2138 Kill_Current_Values
(Last_Assignment_Only
=> True);
2139 Check_Unreachable_Code
(N
);
2141 Analyze_Dimension
(N
);
2142 end Analyze_Return_Statement
;
2144 -------------------------------------
2145 -- Analyze_Simple_Return_Statement --
2146 -------------------------------------
2148 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
2150 if Present
(Expression
(N
)) then
2151 Mark_Coextensions
(N
, Expression
(N
));
2154 Analyze_Return_Statement
(N
);
2155 end Analyze_Simple_Return_Statement
;
2157 -------------------------
2158 -- Analyze_Return_Type --
2159 -------------------------
2161 procedure Analyze_Return_Type
(N
: Node_Id
) is
2162 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2163 Typ
: Entity_Id
:= Empty
;
2166 -- Normal case where result definition does not indicate an error
2168 if Result_Definition
(N
) /= Error
then
2169 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
2170 Check_SPARK_05_Restriction
2171 ("access result is not allowed", Result_Definition
(N
));
2173 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
2176 AD
: constant Node_Id
:=
2177 Access_To_Subprogram_Definition
(Result_Definition
(N
));
2179 if Present
(AD
) and then Protected_Present
(AD
) then
2180 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
2182 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
2186 Set_Parent
(Typ
, Result_Definition
(N
));
2187 Set_Is_Local_Anonymous_Access
(Typ
);
2188 Set_Etype
(Designator
, Typ
);
2190 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2192 Null_Exclusion_Static_Checks
(N
);
2194 -- Subtype_Mark case
2197 Find_Type
(Result_Definition
(N
));
2198 Typ
:= Entity
(Result_Definition
(N
));
2199 Set_Etype
(Designator
, Typ
);
2201 -- Unconstrained array as result is not allowed in SPARK
2203 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
2204 Check_SPARK_05_Restriction
2205 ("returning an unconstrained array is not allowed",
2206 Result_Definition
(N
));
2209 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2211 Null_Exclusion_Static_Checks
(N
);
2213 -- If a null exclusion is imposed on the result type, then create
2214 -- a null-excluding itype (an access subtype) and use it as the
2215 -- function's Etype. Note that the null exclusion checks are done
2216 -- right before this, because they don't get applied to types that
2217 -- do not come from source.
2219 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2220 Set_Etype
(Designator
,
2221 Create_Null_Excluding_Itype
2224 Scope_Id
=> Scope
(Current_Scope
)));
2226 -- The new subtype must be elaborated before use because
2227 -- it is visible outside of the function. However its base
2228 -- type may not be frozen yet, so the reference that will
2229 -- force elaboration must be attached to the freezing of
2232 -- If the return specification appears on a proper body,
2233 -- the subtype will have been created already on the spec.
2235 if Is_Frozen
(Typ
) then
2236 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2237 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2241 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2245 Ensure_Freeze_Node
(Typ
);
2248 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2250 Set_Itype
(IR
, Etype
(Designator
));
2251 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2256 Set_Etype
(Designator
, Typ
);
2259 if Ekind
(Typ
) = E_Incomplete_Type
2260 or else (Is_Class_Wide_Type
(Typ
)
2261 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2263 -- AI05-0151: Tagged incomplete types are allowed in all formal
2264 -- parts. Untagged incomplete types are not allowed in bodies.
2265 -- As a consequence, limited views cannot appear in a basic
2266 -- declaration that is itself within a body, because there is
2267 -- no point at which the non-limited view will become visible.
2269 if Ada_Version
>= Ada_2012
then
2270 if From_Limited_With
(Typ
) and then In_Package_Body
then
2272 ("invalid use of incomplete type&",
2273 Result_Definition
(N
), Typ
);
2275 -- The return type of a subprogram body cannot be of a
2276 -- formal incomplete type.
2278 elsif Is_Generic_Type
(Typ
)
2279 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2282 ("return type cannot be a formal incomplete type",
2283 Result_Definition
(N
));
2285 elsif Is_Class_Wide_Type
(Typ
)
2286 and then Is_Generic_Type
(Root_Type
(Typ
))
2287 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2290 ("return type cannot be a formal incomplete type",
2291 Result_Definition
(N
));
2293 elsif Is_Tagged_Type
(Typ
) then
2296 -- Use is legal in a thunk generated for an operation
2297 -- inherited from a progenitor.
2299 elsif Is_Thunk
(Designator
)
2300 and then Present
(Non_Limited_View
(Typ
))
2304 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2305 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2309 ("invalid use of untagged incomplete type&",
2313 -- The type must be completed in the current package. This
2314 -- is checked at the end of the package declaration when
2315 -- Taft-amendment types are identified. If the return type
2316 -- is class-wide, there is no required check, the type can
2317 -- be a bona fide TAT.
2319 if Ekind
(Scope
(Current_Scope
)) = E_Package
2320 and then In_Private_Part
(Scope
(Current_Scope
))
2321 and then not Is_Class_Wide_Type
(Typ
)
2323 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2328 ("invalid use of incomplete type&", Designator
, Typ
);
2333 -- Case where result definition does indicate an error
2336 Set_Etype
(Designator
, Any_Type
);
2338 end Analyze_Return_Type
;
2340 -----------------------------
2341 -- Analyze_Subprogram_Body --
2342 -----------------------------
2344 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2345 Loc
: constant Source_Ptr
:= Sloc
(N
);
2346 Body_Spec
: constant Node_Id
:= Specification
(N
);
2347 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2350 if Debug_Flag_C
then
2351 Write_Str
("==> subprogram body ");
2352 Write_Name
(Chars
(Body_Id
));
2353 Write_Str
(" from ");
2354 Write_Location
(Loc
);
2359 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2361 -- The real work is split out into the helper, so it can do "return;"
2362 -- without skipping the debug output:
2364 Analyze_Subprogram_Body_Helper
(N
);
2366 if Debug_Flag_C
then
2368 Write_Str
("<== subprogram body ");
2369 Write_Name
(Chars
(Body_Id
));
2370 Write_Str
(" from ");
2371 Write_Location
(Loc
);
2374 end Analyze_Subprogram_Body
;
2376 ------------------------------------
2377 -- Analyze_Subprogram_Body_Helper --
2378 ------------------------------------
2380 -- This procedure is called for regular subprogram bodies, generic bodies,
2381 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2382 -- specification matters, and is used to create a proper declaration for
2383 -- the subprogram, or to perform conformance checks.
2385 -- WARNING: This routine manages Ghost regions. Return statements must be
2386 -- replaced by gotos which jump to the end of the routine and restore the
2389 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2390 Body_Spec
: Node_Id
:= Specification
(N
);
2391 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2392 Loc
: constant Source_Ptr
:= Sloc
(N
);
2393 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2395 Conformant
: Boolean;
2396 Desig_View
: Entity_Id
:= Empty
;
2397 Exch_Views
: Elist_Id
:= No_Elist
;
2399 Mask_Types
: Elist_Id
:= No_Elist
;
2400 Prot_Typ
: Entity_Id
:= Empty
;
2401 Spec_Decl
: Node_Id
:= Empty
;
2402 Spec_Id
: Entity_Id
;
2404 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2405 -- When we analyze a separate spec, the entity chain ends up containing
2406 -- the formals, as well as any itypes generated during analysis of the
2407 -- default expressions for parameters, or the arguments of associated
2408 -- precondition/postcondition pragmas (which are analyzed in the context
2409 -- of the spec since they have visibility on formals).
2411 -- These entities belong with the spec and not the body. However we do
2412 -- the analysis of the body in the context of the spec (again to obtain
2413 -- visibility to the formals), and all the entities generated during
2414 -- this analysis end up also chained to the entity chain of the spec.
2415 -- But they really belong to the body, and there is circuitry to move
2416 -- them from the spec to the body.
2418 -- However, when we do this move, we don't want to move the real spec
2419 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2420 -- variable points to the last real spec entity, so we only move those
2421 -- chained beyond that point. It is initialized to Empty to deal with
2422 -- the case where there is no separate spec.
2424 function Body_Has_Contract
return Boolean;
2425 -- Check whether unanalyzed body has an aspect or pragma that may
2426 -- generate a SPARK contract.
2428 function Body_Has_SPARK_Mode_On
return Boolean;
2429 -- Check whether SPARK_Mode On applies to the subprogram body, either
2430 -- because it is specified directly on the body, or because it is
2431 -- inherited from the enclosing subprogram or package.
2433 procedure Build_Subprogram_Declaration
;
2434 -- Create a matching subprogram declaration for subprogram body N
2436 procedure Check_Anonymous_Return
;
2437 -- Ada 2005: if a function returns an access type that denotes a task,
2438 -- or a type that contains tasks, we must create a master entity for
2439 -- the anonymous type, which typically will be used in an allocator
2440 -- in the body of the function.
2442 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2443 -- Look ahead to recognize a pragma that may appear after the body.
2444 -- If there is a previous spec, check that it appears in the same
2445 -- declarative part. If the pragma is Inline_Always, perform inlining
2446 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2447 -- If the body acts as a spec, and inlining is required, we create a
2448 -- subprogram declaration for it, in order to attach the body to inline.
2449 -- If pragma does not appear after the body, check whether there is
2450 -- an inline pragma before any local declarations.
2452 procedure Check_Missing_Return
;
2453 -- Checks for a function with a no return statements, and also performs
2454 -- the warning checks implemented by Check_Returns. In formal mode, also
2455 -- verify that a function ends with a RETURN and that a procedure does
2456 -- not contain any RETURN.
2458 function Disambiguate_Spec
return Entity_Id
;
2459 -- When a primitive is declared between the private view and the full
2460 -- view of a concurrent type which implements an interface, a special
2461 -- mechanism is used to find the corresponding spec of the primitive
2464 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
;
2465 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2466 -- incomplete types coming from a limited context and replace their
2467 -- limited views with the non-limited ones. Return the list of changes
2468 -- to be used to undo the transformation.
2470 function Is_Private_Concurrent_Primitive
2471 (Subp_Id
: Entity_Id
) return Boolean;
2472 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2473 -- type that implements an interface and has a private view.
2475 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
;
2476 -- N is the body generated for an expression function that is not a
2477 -- completion and Spec_Id the defining entity of its spec. Mark all
2478 -- the not-yet-frozen types referenced by the simple return statement
2479 -- of the function as formally frozen.
2481 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
);
2482 -- Undo the transformation done by Exchange_Limited_Views.
2484 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2485 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2486 -- subprogram whose body is being analyzed. N is the statement node
2487 -- causing the flag to be set, if the following statement is a return
2488 -- of an entity, we mark the entity as set in source to suppress any
2489 -- warning on the stylized use of function stubs with a dummy return.
2491 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
);
2492 -- Undo the transformation done by Mask_Unfrozen_Types
2494 procedure Verify_Overriding_Indicator
;
2495 -- If there was a previous spec, the entity has been entered in the
2496 -- current scope previously. If the body itself carries an overriding
2497 -- indicator, check that it is consistent with the known status of the
2500 -----------------------
2501 -- Body_Has_Contract --
2502 -----------------------
2504 function Body_Has_Contract
return Boolean is
2505 Decls
: constant List_Id
:= Declarations
(N
);
2509 -- Check for aspects that may generate a contract
2511 if Present
(Aspect_Specifications
(N
)) then
2512 Item
:= First
(Aspect_Specifications
(N
));
2513 while Present
(Item
) loop
2514 if Is_Subprogram_Contract_Annotation
(Item
) then
2522 -- Check for pragmas that may generate a contract
2524 if Present
(Decls
) then
2525 Item
:= First
(Decls
);
2526 while Present
(Item
) loop
2527 if Nkind
(Item
) = N_Pragma
2528 and then Is_Subprogram_Contract_Annotation
(Item
)
2538 end Body_Has_Contract
;
2540 ----------------------------
2541 -- Body_Has_SPARK_Mode_On --
2542 ----------------------------
2544 function Body_Has_SPARK_Mode_On
return Boolean is
2545 Decls
: constant List_Id
:= Declarations
(N
);
2549 -- Check for SPARK_Mode aspect
2551 if Present
(Aspect_Specifications
(N
)) then
2552 Item
:= First
(Aspect_Specifications
(N
));
2553 while Present
(Item
) loop
2554 if Get_Aspect_Id
(Item
) = Aspect_SPARK_Mode
then
2555 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2562 -- Check for SPARK_Mode pragma
2564 if Present
(Decls
) then
2565 Item
:= First
(Decls
);
2566 while Present
(Item
) loop
2568 -- Pragmas that apply to a subprogram body are usually grouped
2569 -- together. Look for a potential pragma SPARK_Mode among them.
2571 if Nkind
(Item
) = N_Pragma
then
2572 if Get_Pragma_Id
(Item
) = Pragma_SPARK_Mode
then
2573 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2576 -- Otherwise the first non-pragma declarative item terminates
2577 -- the region where pragma SPARK_Mode may appear.
2587 -- Otherwise, the applicable SPARK_Mode is inherited from the
2588 -- enclosing subprogram or package.
2590 return SPARK_Mode
= On
;
2591 end Body_Has_SPARK_Mode_On
;
2593 ----------------------------------
2594 -- Build_Subprogram_Declaration --
2595 ----------------------------------
2597 procedure Build_Subprogram_Declaration
is
2598 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
);
2599 -- Relocate certain categorization pragmas from the declarative list
2600 -- of subprogram body From and insert them after node To. The pragmas
2603 -- Volatile_Function
2604 -- Also copy pragma SPARK_Mode if present in the declarative list
2605 -- of subprogram body From and insert it after node To. This pragma
2606 -- should not be moved, as it applies to the body too.
2612 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
) is
2614 Next_Decl
: Node_Id
;
2617 pragma Assert
(Nkind
(From
) = N_Subprogram_Body
);
2619 -- The destination node must be part of a list, as the pragmas are
2620 -- inserted after it.
2622 pragma Assert
(Is_List_Member
(To
));
2624 -- Inspect the declarations of the subprogram body looking for
2625 -- specific pragmas.
2627 Decl
:= First
(Declarations
(N
));
2628 while Present
(Decl
) loop
2629 Next_Decl
:= Next
(Decl
);
2631 if Nkind
(Decl
) = N_Pragma
then
2632 if Pragma_Name_Unmapped
(Decl
) = Name_SPARK_Mode
then
2633 Insert_After
(To
, New_Copy_Tree
(Decl
));
2635 elsif Nam_In
(Pragma_Name_Unmapped
(Decl
),
2637 Name_Volatile_Function
)
2640 Insert_After
(To
, Decl
);
2651 Subp_Decl
: Node_Id
;
2653 -- Start of processing for Build_Subprogram_Declaration
2656 -- Create a matching subprogram spec using the profile of the body.
2657 -- The structure of the tree is identical, but has new entities for
2658 -- the defining unit name and formal parameters.
2661 Make_Subprogram_Declaration
(Loc
,
2662 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2663 Set_Comes_From_Source
(Subp_Decl
, True);
2665 -- Relocate the aspects and relevant pragmas from the subprogram body
2666 -- to the generated spec because it acts as the initial declaration.
2668 Insert_Before
(N
, Subp_Decl
);
2669 Move_Aspects
(N
, To
=> Subp_Decl
);
2670 Move_Pragmas
(N
, To
=> Subp_Decl
);
2672 -- Ensure that the generated corresponding spec and original body
2673 -- share the same SPARK_Mode pragma or aspect. As a result, both have
2674 -- the same SPARK_Mode attributes, and the global SPARK_Mode value is
2675 -- correctly set for local subprograms.
2677 Copy_SPARK_Mode_Aspect
(Subp_Decl
, To
=> N
);
2679 Analyze
(Subp_Decl
);
2681 -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to
2682 -- the body since the expander may generate calls using that entity.
2683 -- Required to ensure that Expand_Call rewrites calls to this
2684 -- function by calls to the built procedure.
2686 if Modify_Tree_For_C
2687 and then Nkind
(Body_Spec
) = N_Function_Specification
2689 Rewritten_For_C
(Defining_Entity
(Specification
(Subp_Decl
)))
2691 Set_Rewritten_For_C
(Defining_Entity
(Body_Spec
));
2692 Set_Corresponding_Procedure
(Defining_Entity
(Body_Spec
),
2693 Corresponding_Procedure
2694 (Defining_Entity
(Specification
(Subp_Decl
))));
2697 -- Analyze any relocated source pragmas or pragmas created for aspect
2700 Decl
:= Next
(Subp_Decl
);
2701 while Present
(Decl
) loop
2703 -- Stop the search for pragmas once the body has been reached as
2704 -- this terminates the region where pragmas may appear.
2709 elsif Nkind
(Decl
) = N_Pragma
then
2716 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2717 Set_Corresponding_Spec
(N
, Spec_Id
);
2719 -- Mark the generated spec as a source construct to ensure that all
2720 -- calls to it are properly registered in ALI files for GNATprove.
2722 Set_Comes_From_Source
(Spec_Id
, True);
2724 -- Ensure that the specs of the subprogram declaration and its body
2725 -- are identical, otherwise they will appear non-conformant due to
2726 -- rewritings in the default values of formal parameters.
2728 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2729 Set_Specification
(N
, Body_Spec
);
2730 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2731 end Build_Subprogram_Declaration
;
2733 ----------------------------
2734 -- Check_Anonymous_Return --
2735 ----------------------------
2737 procedure Check_Anonymous_Return
is
2743 if Present
(Spec_Id
) then
2749 if Ekind
(Scop
) = E_Function
2750 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2751 and then not Is_Thunk
(Scop
)
2753 -- Skip internally built functions which handle the case of
2754 -- a null access (see Expand_Interface_Conversion)
2756 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2757 and then not Comes_From_Source
(Parent
(Scop
)))
2759 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2761 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2763 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2764 and then Expander_Active
2766 -- Avoid cases with no tasking support
2768 and then RTE_Available
(RE_Current_Master
)
2769 and then not Restriction_Active
(No_Task_Hierarchy
)
2772 Make_Object_Declaration
(Loc
,
2773 Defining_Identifier
=>
2774 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2775 Constant_Present
=> True,
2776 Object_Definition
=>
2777 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2779 Make_Explicit_Dereference
(Loc
,
2780 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2782 if Present
(Declarations
(N
)) then
2783 Prepend
(Decl
, Declarations
(N
));
2785 Set_Declarations
(N
, New_List
(Decl
));
2788 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2789 Set_Has_Master_Entity
(Scop
);
2791 -- Now mark the containing scope as a task master
2794 while Nkind
(Par
) /= N_Compilation_Unit
loop
2795 Par
:= Parent
(Par
);
2796 pragma Assert
(Present
(Par
));
2798 -- If we fall off the top, we are at the outer level, and
2799 -- the environment task is our effective master, so nothing
2803 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2805 Set_Is_Task_Master
(Par
, True);
2810 end Check_Anonymous_Return
;
2812 -------------------------
2813 -- Check_Inline_Pragma --
2814 -------------------------
2816 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2820 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2821 -- True when N is a pragma Inline or Inline_Always that applies
2822 -- to this subprogram.
2824 -----------------------
2825 -- Is_Inline_Pragma --
2826 -----------------------
2828 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2830 if Nkind
(N
) = N_Pragma
2832 (Pragma_Name_Unmapped
(N
) = Name_Inline_Always
2833 or else (Pragma_Name_Unmapped
(N
) = Name_Inline
2835 (Front_End_Inlining
or else Optimization_Level
> 0)))
2836 and then Present
(Pragma_Argument_Associations
(N
))
2839 Pragma_Arg
: Node_Id
:=
2840 Expression
(First
(Pragma_Argument_Associations
(N
)));
2842 if Nkind
(Pragma_Arg
) = N_Selected_Component
then
2843 Pragma_Arg
:= Selector_Name
(Pragma_Arg
);
2846 return Chars
(Pragma_Arg
) = Chars
(Body_Id
);
2852 end Is_Inline_Pragma
;
2854 -- Start of processing for Check_Inline_Pragma
2857 if not Expander_Active
then
2861 if Is_List_Member
(N
)
2862 and then Present
(Next
(N
))
2863 and then Is_Inline_Pragma
(Next
(N
))
2867 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2868 and then Present
(Declarations
(N
))
2869 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2871 Prag
:= First
(Declarations
(N
));
2877 if Present
(Prag
) then
2878 if Present
(Spec_Id
) then
2879 if Is_List_Member
(N
)
2880 and then Is_List_Member
(Unit_Declaration_Node
(Spec_Id
))
2881 and then In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
))
2887 -- Create a subprogram declaration, to make treatment uniform.
2888 -- Make the sloc of the subprogram name that of the entity in
2889 -- the body, so that style checks find identical strings.
2892 Subp
: constant Entity_Id
:=
2893 Make_Defining_Identifier
2894 (Sloc
(Body_Id
), Chars
(Body_Id
));
2895 Decl
: constant Node_Id
:=
2896 Make_Subprogram_Declaration
(Loc
,
2898 New_Copy_Tree
(Specification
(N
)));
2901 -- Link the body and the generated spec
2903 Set_Corresponding_Body
(Decl
, Body_Id
);
2904 Set_Corresponding_Spec
(N
, Subp
);
2906 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2908 -- To ensure proper coverage when body is inlined, indicate
2909 -- whether the subprogram comes from source.
2911 Set_Comes_From_Source
(Subp
, Comes_From_Source
(N
));
2913 if Present
(First_Formal
(Body_Id
)) then
2914 Plist
:= Copy_Parameter_List
(Body_Id
);
2915 Set_Parameter_Specifications
2916 (Specification
(Decl
), Plist
);
2919 -- Move aspects to the new spec
2921 if Has_Aspects
(N
) then
2922 Move_Aspects
(N
, To
=> Decl
);
2925 Insert_Before
(N
, Decl
);
2928 Set_Has_Pragma_Inline
(Subp
);
2930 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2931 Set_Is_Inlined
(Subp
);
2932 Set_Has_Pragma_Inline_Always
(Subp
);
2935 -- Prior to copying the subprogram body to create a template
2936 -- for it for subsequent inlining, remove the pragma from
2937 -- the current body so that the copy that will produce the
2938 -- new body will start from a completely unanalyzed tree.
2940 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2941 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2948 end Check_Inline_Pragma
;
2950 --------------------------
2951 -- Check_Missing_Return --
2952 --------------------------
2954 procedure Check_Missing_Return
is
2956 Missing_Ret
: Boolean;
2959 if Nkind
(Body_Spec
) = N_Function_Specification
then
2960 if Present
(Spec_Id
) then
2966 if Return_Present
(Id
) then
2967 Check_Returns
(HSS
, 'F', Missing_Ret
);
2970 Set_Has_Missing_Return
(Id
);
2973 -- Within a premature instantiation of a package with no body, we
2974 -- build completions of the functions therein, with a Raise
2975 -- statement. No point in complaining about a missing return in
2978 elsif Ekind
(Id
) = E_Function
2979 and then In_Instance
2980 and then Present
(Statements
(HSS
))
2981 and then Nkind
(First
(Statements
(HSS
))) = N_Raise_Program_Error
2985 elsif Is_Generic_Subprogram
(Id
)
2986 or else not Is_Machine_Code_Subprogram
(Id
)
2988 Error_Msg_N
("missing RETURN statement in function body", N
);
2991 -- If procedure with No_Return, check returns
2993 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2994 and then Present
(Spec_Id
)
2995 and then No_Return
(Spec_Id
)
2997 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
3000 -- Special checks in SPARK mode
3002 if Nkind
(Body_Spec
) = N_Function_Specification
then
3004 -- In SPARK mode, last statement of a function should be a return
3007 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
3010 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
3011 N_Extended_Return_Statement
)
3013 Check_SPARK_05_Restriction
3014 ("last statement in function should be RETURN", Stat
);
3018 -- In SPARK mode, verify that a procedure has no return
3020 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
3021 if Present
(Spec_Id
) then
3027 -- Would be nice to point to return statement here, can we
3028 -- borrow the Check_Returns procedure here ???
3030 if Return_Present
(Id
) then
3031 Check_SPARK_05_Restriction
3032 ("procedure should not have RETURN", N
);
3035 end Check_Missing_Return
;
3037 -----------------------
3038 -- Disambiguate_Spec --
3039 -----------------------
3041 function Disambiguate_Spec
return Entity_Id
is
3042 Priv_Spec
: Entity_Id
;
3045 procedure Replace_Types
(To_Corresponding
: Boolean);
3046 -- Depending on the flag, replace the type of formal parameters of
3047 -- Body_Id if it is a concurrent type implementing interfaces with
3048 -- the corresponding record type or the other way around.
3050 procedure Replace_Types
(To_Corresponding
: Boolean) is
3052 Formal_Typ
: Entity_Id
;
3055 Formal
:= First_Formal
(Body_Id
);
3056 while Present
(Formal
) loop
3057 Formal_Typ
:= Etype
(Formal
);
3059 if Is_Class_Wide_Type
(Formal_Typ
) then
3060 Formal_Typ
:= Root_Type
(Formal_Typ
);
3063 -- From concurrent type to corresponding record
3065 if To_Corresponding
then
3066 if Is_Concurrent_Type
(Formal_Typ
)
3067 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
3070 (Corresponding_Record_Type
(Formal_Typ
)))
3073 Corresponding_Record_Type
(Formal_Typ
));
3076 -- From corresponding record to concurrent type
3079 if Is_Concurrent_Record_Type
(Formal_Typ
)
3080 and then Present
(Interfaces
(Formal_Typ
))
3083 Corresponding_Concurrent_Type
(Formal_Typ
));
3087 Next_Formal
(Formal
);
3091 -- Start of processing for Disambiguate_Spec
3094 -- Try to retrieve the specification of the body as is. All error
3095 -- messages are suppressed because the body may not have a spec in
3096 -- its current state.
3098 Spec_N
:= Find_Corresponding_Spec
(N
, False);
3100 -- It is possible that this is the body of a primitive declared
3101 -- between a private and a full view of a concurrent type. The
3102 -- controlling parameter of the spec carries the concurrent type,
3103 -- not the corresponding record type as transformed by Analyze_
3104 -- Subprogram_Specification. In such cases, we undo the change
3105 -- made by the analysis of the specification and try to find the
3108 -- Note that wrappers already have their corresponding specs and
3109 -- bodies set during their creation, so if the candidate spec is
3110 -- a wrapper, then we definitely need to swap all types to their
3111 -- original concurrent status.
3114 or else Is_Primitive_Wrapper
(Spec_N
)
3116 -- Restore all references of corresponding record types to the
3117 -- original concurrent types.
3119 Replace_Types
(To_Corresponding
=> False);
3120 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
3122 -- The current body truly belongs to a primitive declared between
3123 -- a private and a full view. We leave the modified body as is,
3124 -- and return the true spec.
3126 if Present
(Priv_Spec
)
3127 and then Is_Private_Primitive
(Priv_Spec
)
3132 -- In case that this is some sort of error, restore the original
3133 -- state of the body.
3135 Replace_Types
(To_Corresponding
=> True);
3139 end Disambiguate_Spec
;
3141 ----------------------------
3142 -- Exchange_Limited_Views --
3143 ----------------------------
3145 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
is
3146 Result
: Elist_Id
:= No_Elist
;
3148 procedure Detect_And_Exchange
(Id
: Entity_Id
);
3149 -- Determine whether Id's type denotes an incomplete type associated
3150 -- with a limited with clause and exchange the limited view with the
3151 -- non-limited one when available. Note that the non-limited view
3152 -- may exist because of a with_clause in another unit in the context,
3153 -- but cannot be used because the current view of the enclosing unit
3154 -- is still a limited view.
3156 -------------------------
3157 -- Detect_And_Exchange --
3158 -------------------------
3160 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
3161 Typ
: constant Entity_Id
:= Etype
(Id
);
3163 if From_Limited_With
(Typ
)
3164 and then Has_Non_Limited_View
(Typ
)
3165 and then not From_Limited_With
(Scope
(Typ
))
3168 Result
:= New_Elmt_List
;
3171 Prepend_Elmt
(Typ
, Result
);
3172 Prepend_Elmt
(Id
, Result
);
3173 Set_Etype
(Id
, Non_Limited_View
(Typ
));
3175 end Detect_And_Exchange
;
3181 -- Start of processing for Exchange_Limited_Views
3184 -- Do not process subprogram bodies as they already use the non-
3185 -- limited view of types.
3187 if not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
3191 -- Examine all formals and swap views when applicable
3193 Formal
:= First_Formal
(Subp_Id
);
3194 while Present
(Formal
) loop
3195 Detect_And_Exchange
(Formal
);
3197 Next_Formal
(Formal
);
3200 -- Process the return type of a function
3202 if Ekind
(Subp_Id
) = E_Function
then
3203 Detect_And_Exchange
(Subp_Id
);
3207 end Exchange_Limited_Views
;
3209 -------------------------------------
3210 -- Is_Private_Concurrent_Primitive --
3211 -------------------------------------
3213 function Is_Private_Concurrent_Primitive
3214 (Subp_Id
: Entity_Id
) return Boolean
3216 Formal_Typ
: Entity_Id
;
3219 if Present
(First_Formal
(Subp_Id
)) then
3220 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
3222 if Is_Concurrent_Record_Type
(Formal_Typ
) then
3223 if Is_Class_Wide_Type
(Formal_Typ
) then
3224 Formal_Typ
:= Root_Type
(Formal_Typ
);
3227 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
3230 -- The type of the first formal is a concurrent tagged type with
3234 Is_Concurrent_Type
(Formal_Typ
)
3235 and then Is_Tagged_Type
(Formal_Typ
)
3236 and then Has_Private_Declaration
(Formal_Typ
);
3240 end Is_Private_Concurrent_Primitive
;
3242 -------------------------
3243 -- Mask_Unfrozen_Types --
3244 -------------------------
3246 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
is
3247 Result
: Elist_Id
:= No_Elist
;
3249 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
;
3250 -- Mask all types referenced in the subtree rooted at Node
3252 --------------------
3253 -- Mask_Type_Refs --
3254 --------------------
3256 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
is
3257 procedure Mask_Type
(Typ
: Entity_Id
);
3258 -- ??? what does this do?
3264 procedure Mask_Type
(Typ
: Entity_Id
) is
3266 -- Skip Itypes created by the preanalysis
3269 and then Scope_Within_Or_Same
(Scope
(Typ
), Spec_Id
)
3274 if not Is_Frozen
(Typ
) then
3275 Set_Is_Frozen
(Typ
);
3276 Append_New_Elmt
(Typ
, Result
);
3280 -- Start of processing for Mask_Type_Refs
3283 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
3284 Mask_Type
(Etype
(Entity
(Node
)));
3286 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
3287 Mask_Type
(Scope
(Entity
(Node
)));
3290 elsif Nkind_In
(Node
, N_Aggregate
, N_Null
, N_Type_Conversion
)
3291 and then Present
(Etype
(Node
))
3293 Mask_Type
(Etype
(Node
));
3299 procedure Mask_References
is new Traverse_Proc
(Mask_Type_Refs
);
3303 Return_Stmt
: constant Node_Id
:=
3304 First
(Statements
(Handled_Statement_Sequence
(N
)));
3306 -- Start of processing for Mask_Unfrozen_Types
3309 pragma Assert
(Nkind
(Return_Stmt
) = N_Simple_Return_Statement
);
3311 Mask_References
(Expression
(Return_Stmt
));
3314 end Mask_Unfrozen_Types
;
3316 ---------------------------
3317 -- Restore_Limited_Views --
3318 ---------------------------
3320 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
) is
3321 Elmt
: Elmt_Id
:= First_Elmt
(Restore_List
);
3325 while Present
(Elmt
) loop
3328 Set_Etype
(Id
, Node
(Elmt
));
3331 end Restore_Limited_Views
;
3333 ----------------------------
3334 -- Set_Trivial_Subprogram --
3335 ----------------------------
3337 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
3338 Nxt
: constant Node_Id
:= Next
(N
);
3341 Set_Is_Trivial_Subprogram
(Body_Id
);
3343 if Present
(Spec_Id
) then
3344 Set_Is_Trivial_Subprogram
(Spec_Id
);
3348 and then Nkind
(Nxt
) = N_Simple_Return_Statement
3349 and then No
(Next
(Nxt
))
3350 and then Present
(Expression
(Nxt
))
3351 and then Is_Entity_Name
(Expression
(Nxt
))
3353 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
3355 end Set_Trivial_Subprogram
;
3357 ---------------------------
3358 -- Unmask_Unfrozen_Types --
3359 ---------------------------
3361 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
) is
3362 Elmt
: Elmt_Id
:= First_Elmt
(Unmask_List
);
3365 while Present
(Elmt
) loop
3366 Set_Is_Frozen
(Node
(Elmt
), False);
3369 end Unmask_Unfrozen_Types
;
3371 ---------------------------------
3372 -- Verify_Overriding_Indicator --
3373 ---------------------------------
3375 procedure Verify_Overriding_Indicator
is
3377 if Must_Override
(Body_Spec
) then
3378 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3379 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3383 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
3385 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
3387 -- Overriding indicators aren't allowed for protected subprogram
3388 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3389 -- this to a warning if -gnatd.E is enabled.
3391 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3392 Error_Msg_Warn
:= Error_To_Warning
;
3394 ("<<overriding indicator not allowed for protected "
3395 & "subprogram body", Body_Spec
);
3398 elsif Must_Not_Override
(Body_Spec
) then
3399 if Present
(Overridden_Operation
(Spec_Id
)) then
3401 ("subprogram& overrides inherited operation",
3402 Body_Spec
, Spec_Id
);
3404 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3405 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3408 ("subprogram& overrides predefined operator ",
3409 Body_Spec
, Spec_Id
);
3411 -- Overriding indicators aren't allowed for protected subprogram
3412 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3413 -- this to a warning if -gnatd.E is enabled.
3415 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3416 Error_Msg_Warn
:= Error_To_Warning
;
3419 ("<<overriding indicator not allowed "
3420 & "for protected subprogram body", Body_Spec
);
3422 -- If this is not a primitive operation, then the overriding
3423 -- indicator is altogether illegal.
3425 elsif not Is_Primitive
(Spec_Id
) then
3427 ("overriding indicator only allowed "
3428 & "if subprogram is primitive", Body_Spec
);
3431 -- If checking the style rule and the operation overrides, then
3432 -- issue a warning about a missing overriding_indicator. Protected
3433 -- subprogram bodies are excluded from this style checking, since
3434 -- they aren't primitives (even though their declarations can
3435 -- override) and aren't allowed to have an overriding_indicator.
3438 and then Present
(Overridden_Operation
(Spec_Id
))
3439 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3441 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3442 Style
.Missing_Overriding
(N
, Body_Id
);
3445 and then Can_Override_Operator
(Spec_Id
)
3446 and then not In_Predefined_Unit
(Spec_Id
)
3448 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3449 Style
.Missing_Overriding
(N
, Body_Id
);
3451 end Verify_Overriding_Indicator
;
3455 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3456 Saved_ISMP
: constant Boolean :=
3457 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3458 -- Save the Ghost and SPARK mode-related data to restore on exit
3460 -- Start of processing for Analyze_Subprogram_Body_Helper
3463 -- A [generic] subprogram body freezes the contract of the nearest
3464 -- enclosing package body and all other contracts encountered in the
3465 -- same declarative part up to and excluding the subprogram body:
3467 -- package body Nearest_Enclosing_Package
3468 -- with Refined_State => (State => Constit)
3472 -- procedure Freezes_Enclosing_Package_Body
3473 -- with Refined_Depends => (Input => Constit) ...
3475 -- This ensures that any annotations referenced by the contract of the
3476 -- [generic] subprogram body are available. This form of freezing is
3477 -- decoupled from the usual Freeze_xxx mechanism because it must also
3478 -- work in the context of generics where normal freezing is disabled.
3480 -- Only bodies coming from source should cause this type of freezing.
3481 -- Expression functions that act as bodies and complete an initial
3482 -- declaration must be included in this category, hence the use of
3485 if Comes_From_Source
(Original_Node
(N
)) then
3486 Freeze_Previous_Contracts
(N
);
3489 -- Generic subprograms are handled separately. They always have a
3490 -- generic specification. Determine whether current scope has a
3491 -- previous declaration.
3493 -- If the subprogram body is defined within an instance of the same
3494 -- name, the instance appears as a package renaming, and will be hidden
3495 -- within the subprogram.
3497 if Present
(Prev_Id
)
3498 and then not Is_Overloadable
(Prev_Id
)
3499 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3500 or else Comes_From_Source
(Prev_Id
))
3502 if Is_Generic_Subprogram
(Prev_Id
) then
3505 -- A subprogram body is Ghost when it is stand alone and subject
3506 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3507 -- the mode now to ensure that any nodes generated during analysis
3508 -- and expansion are properly marked as Ghost.
3510 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3512 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3513 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3515 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3517 if Nkind
(N
) = N_Subprogram_Body
then
3518 HSS
:= Handled_Statement_Sequence
(N
);
3519 Check_Missing_Return
;
3524 -- Otherwise a previous entity conflicts with the subprogram name.
3525 -- Attempting to enter name will post error.
3528 Enter_Name
(Body_Id
);
3532 -- Non-generic case, find the subprogram declaration, if one was seen,
3533 -- or enter new overloaded entity in the current scope. If the
3534 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3535 -- part of the context of one of its subunits. No need to redo the
3538 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3542 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3544 if Nkind
(N
) = N_Subprogram_Body_Stub
3545 or else No
(Corresponding_Spec
(N
))
3547 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3548 Spec_Id
:= Disambiguate_Spec
;
3550 -- A subprogram body is Ghost when it is stand alone and
3551 -- subject to pragma Ghost or when the corresponding spec is
3552 -- Ghost. Set the mode now to ensure that any nodes generated
3553 -- during analysis and expansion are properly marked as Ghost.
3555 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3558 Spec_Id
:= Find_Corresponding_Spec
(N
);
3560 -- A subprogram body is Ghost when it is stand alone and
3561 -- subject to pragma Ghost or when the corresponding spec is
3562 -- Ghost. Set the mode now to ensure that any nodes generated
3563 -- during analysis and expansion are properly marked as Ghost.
3565 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3567 -- In GNATprove mode, if the body has no previous spec, create
3568 -- one so that the inlining machinery can operate properly.
3569 -- Transfer aspects, if any, to the new spec, so that they
3570 -- are legal and can be processed ahead of the body.
3571 -- We make two copies of the given spec, one for the new
3572 -- declaration, and one for the body.
3574 if No
(Spec_Id
) and then GNATprove_Mode
3576 -- Inlining does not apply during pre-analysis of code
3578 and then Full_Analysis
3580 -- Inlining only applies to full bodies, not stubs
3582 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3584 -- Inlining only applies to bodies in the source code, not to
3585 -- those generated by the compiler. In particular, expression
3586 -- functions, whose body is generated by the compiler, are
3587 -- treated specially by GNATprove.
3589 and then Comes_From_Source
(Body_Id
)
3591 -- This cannot be done for a compilation unit, which is not
3592 -- in a context where we can insert a new spec.
3594 and then Is_List_Member
(N
)
3596 -- Inlining only applies to subprograms without contracts,
3597 -- as a contract is a sign that GNATprove should perform a
3598 -- modular analysis of the subprogram instead of a contextual
3599 -- analysis at each call site. The same test is performed in
3600 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3601 -- here in another form (because the contract has not been
3602 -- attached to the body) to avoid front-end errors in case
3603 -- pragmas are used instead of aspects, because the
3604 -- corresponding pragmas in the body would not be transferred
3605 -- to the spec, leading to legality errors.
3607 and then not Body_Has_Contract
3608 and then not Inside_A_Generic
3610 Build_Subprogram_Declaration
;
3612 -- If this is a function that returns a constrained array, and
3613 -- we are generating SPARK_For_C, create subprogram declaration
3614 -- to simplify subsequent C generation.
3617 and then Modify_Tree_For_C
3618 and then Nkind
(Body_Spec
) = N_Function_Specification
3619 and then Is_Array_Type
(Etype
(Body_Id
))
3620 and then Is_Constrained
(Etype
(Body_Id
))
3622 Build_Subprogram_Declaration
;
3626 -- If this is a duplicate body, no point in analyzing it
3628 if Error_Posted
(N
) then
3632 -- A subprogram body should cause freezing of its own declaration,
3633 -- but if there was no previous explicit declaration, then the
3634 -- subprogram will get frozen too late (there may be code within
3635 -- the body that depends on the subprogram having been frozen,
3636 -- such as uses of extra formals), so we force it to be frozen
3637 -- here. Same holds if the body and spec are compilation units.
3638 -- Finally, if the return type is an anonymous access to protected
3639 -- subprogram, it must be frozen before the body because its
3640 -- expansion has generated an equivalent type that is used when
3641 -- elaborating the body.
3643 -- An exception in the case of Ada 2012, AI05-177: The bodies
3644 -- created for expression functions do not freeze.
3647 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3649 Freeze_Before
(N
, Body_Id
);
3651 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3652 Freeze_Before
(N
, Spec_Id
);
3654 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3655 Freeze_Before
(N
, Etype
(Body_Id
));
3659 Spec_Id
:= Corresponding_Spec
(N
);
3661 -- A subprogram body is Ghost when it is stand alone and subject
3662 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3663 -- the mode now to ensure that any nodes generated during analysis
3664 -- and expansion are properly marked as Ghost.
3666 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3670 -- Previously we scanned the body to look for nested subprograms, and
3671 -- rejected an inline directive if nested subprograms were present,
3672 -- because the back-end would generate conflicting symbols for the
3673 -- nested bodies. This is now unnecessary.
3675 -- Look ahead to recognize a pragma Inline that appears after the body
3677 Check_Inline_Pragma
(Spec_Id
);
3679 -- Deal with special case of a fully private operation in the body of
3680 -- the protected type. We must create a declaration for the subprogram,
3681 -- in order to attach the protected subprogram that will be used in
3682 -- internal calls. We exclude compiler generated bodies from the
3683 -- expander since the issue does not arise for those cases.
3686 and then Comes_From_Source
(N
)
3687 and then Is_Protected_Type
(Current_Scope
)
3689 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3692 -- If we are generating C and this is a function returning a constrained
3693 -- array type for which we must create a procedure with an extra out
3694 -- parameter, build and analyze the body now. The procedure declaration
3695 -- has already been created. We reuse the source body of the function,
3696 -- because in an instance it may contain global references that cannot
3697 -- be reanalyzed. The source function itself is not used any further,
3698 -- so we mark it as having a completion. If the subprogram is a stub the
3699 -- transformation is done later, when the proper body is analyzed.
3702 and then Modify_Tree_For_C
3703 and then Present
(Spec_Id
)
3704 and then Ekind
(Spec_Id
) = E_Function
3705 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3706 and then Rewritten_For_C
(Spec_Id
)
3708 Set_Has_Completion
(Spec_Id
);
3710 Rewrite
(N
, Build_Procedure_Body_Form
(Spec_Id
, N
));
3713 -- The entity for the created procedure must remain invisible, so it
3714 -- does not participate in resolution of subsequent references to the
3717 Set_Is_Immediately_Visible
(Corresponding_Spec
(N
), False);
3721 -- If a separate spec is present, then deal with freezing issues
3723 if Present
(Spec_Id
) then
3724 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3725 Verify_Overriding_Indicator
;
3727 -- In general, the spec will be frozen when we start analyzing the
3728 -- body. However, for internally generated operations, such as
3729 -- wrapper functions for inherited operations with controlling
3730 -- results, the spec may not have been frozen by the time we expand
3731 -- the freeze actions that include the bodies. In particular, extra
3732 -- formals for accessibility or for return-in-place may need to be
3733 -- generated. Freeze nodes, if any, are inserted before the current
3734 -- body. These freeze actions are also needed in ASIS mode and in
3735 -- Compile_Only mode to enable the proper back-end type annotations.
3736 -- They are necessary in any case to insure order of elaboration
3739 if not Is_Frozen
(Spec_Id
)
3740 and then (Expander_Active
3742 or else (Operating_Mode
= Check_Semantics
3743 and then Serious_Errors_Detected
= 0))
3745 -- The body generated for an expression function that is not a
3746 -- completion is a freeze point neither for the profile nor for
3747 -- anything else. That's why, in order to prevent any freezing
3748 -- during analysis, we need to mask types declared outside the
3749 -- expression that are not yet frozen.
3751 if Nkind
(N
) = N_Subprogram_Body
3752 and then Was_Expression_Function
(N
)
3753 and then not Has_Completion
(Spec_Id
)
3755 Set_Is_Frozen
(Spec_Id
);
3756 Mask_Types
:= Mask_Unfrozen_Types
(Spec_Id
);
3758 Set_Has_Delayed_Freeze
(Spec_Id
);
3759 Freeze_Before
(N
, Spec_Id
);
3764 -- If the subprogram has a class-wide clone, build its body as a copy
3765 -- of the original body, and rewrite body of original subprogram as a
3766 -- wrapper that calls the clone.
3768 if Present
(Spec_Id
)
3769 and then Present
(Class_Wide_Clone
(Spec_Id
))
3770 and then (Comes_From_Source
(N
) or else Was_Expression_Function
(N
))
3772 Build_Class_Wide_Clone_Body
(Spec_Id
, N
);
3774 -- This is the new body for the existing primitive operation
3776 Rewrite
(N
, Build_Class_Wide_Clone_Call
3777 (Sloc
(N
), New_List
, Spec_Id
, Parent
(Spec_Id
)));
3778 Set_Has_Completion
(Spec_Id
, False);
3783 -- Place subprogram on scope stack, and make formals visible. If there
3784 -- is a spec, the visible entity remains that of the spec.
3786 if Present
(Spec_Id
) then
3787 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3789 if Is_Child_Unit
(Spec_Id
) then
3790 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3794 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3797 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3798 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3800 if Is_Abstract_Subprogram
(Spec_Id
) then
3801 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3805 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3806 Set_Has_Completion
(Spec_Id
);
3808 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3809 Prot_Typ
:= Scope
(Spec_Id
);
3812 -- If this is a body generated for a renaming, do not check for
3813 -- full conformance. The check is redundant, because the spec of
3814 -- the body is a copy of the spec in the renaming declaration,
3815 -- and the test can lead to spurious errors on nested defaults.
3817 if Present
(Spec_Decl
)
3818 and then not Comes_From_Source
(N
)
3820 (Nkind
(Original_Node
(Spec_Decl
)) =
3821 N_Subprogram_Renaming_Declaration
3822 or else (Present
(Corresponding_Body
(Spec_Decl
))
3824 Nkind
(Unit_Declaration_Node
3825 (Corresponding_Body
(Spec_Decl
))) =
3826 N_Subprogram_Renaming_Declaration
))
3830 -- Conversely, the spec may have been generated for specless body
3831 -- with an inline pragma. The entity comes from source, which is
3832 -- both semantically correct and necessary for proper inlining.
3833 -- The subprogram declaration itself is not in the source.
3835 elsif Comes_From_Source
(N
)
3836 and then Present
(Spec_Decl
)
3837 and then not Comes_From_Source
(Spec_Decl
)
3838 and then Has_Pragma_Inline
(Spec_Id
)
3845 Fully_Conformant
, True, Conformant
, Body_Id
);
3848 -- If the body is not fully conformant, we have to decide if we
3849 -- should analyze it or not. If it has a really messed up profile
3850 -- then we probably should not analyze it, since we will get too
3851 -- many bogus messages.
3853 -- Our decision is to go ahead in the non-fully conformant case
3854 -- only if it is at least mode conformant with the spec. Note
3855 -- that the call to Check_Fully_Conformant has issued the proper
3856 -- error messages to complain about the lack of conformance.
3859 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3865 if Spec_Id
/= Body_Id
then
3866 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3869 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3871 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3872 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3877 Set_Corresponding_Spec
(N
, Spec_Id
);
3879 -- Ada 2005 (AI-345): If the operation is a primitive operation
3880 -- of a concurrent type, the type of the first parameter has been
3881 -- replaced with the corresponding record, which is the proper
3882 -- run-time structure to use. However, within the body there may
3883 -- be uses of the formals that depend on primitive operations
3884 -- of the type (in particular calls in prefixed form) for which
3885 -- we need the original concurrent type. The operation may have
3886 -- several controlling formals, so the replacement must be done
3889 if Comes_From_Source
(Spec_Id
)
3890 and then Present
(First_Entity
(Spec_Id
))
3891 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3892 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3893 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3894 and then Present
(Corresponding_Concurrent_Type
3895 (Etype
(First_Entity
(Spec_Id
))))
3898 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3902 Form
:= First_Formal
(Spec_Id
);
3903 while Present
(Form
) loop
3904 if Etype
(Form
) = Typ
then
3905 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3913 -- Make the formals visible, and place subprogram on scope stack.
3914 -- This is also the point at which we set Last_Real_Spec_Entity
3915 -- to mark the entities which will not be moved to the body.
3917 Install_Formals
(Spec_Id
);
3918 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3920 -- Within an instance, add local renaming declarations so that
3921 -- gdb can retrieve the values of actuals more easily. This is
3922 -- only relevant if generating code (and indeed we definitely
3923 -- do not want these definitions -gnatc mode, because that would
3926 if Is_Generic_Instance
(Spec_Id
)
3927 and then Is_Wrapper_Package
(Current_Scope
)
3928 and then Expander_Active
3930 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3933 Push_Scope
(Spec_Id
);
3935 -- Make sure that the subprogram is immediately visible. For
3936 -- child units that have no separate spec this is indispensable.
3937 -- Otherwise it is safe albeit redundant.
3939 Set_Is_Immediately_Visible
(Spec_Id
);
3942 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3943 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3944 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3946 -- Case of subprogram body with no previous spec
3949 -- Check for style warning required
3953 -- Only apply check for source level subprograms for which checks
3954 -- have not been suppressed.
3956 and then Comes_From_Source
(Body_Id
)
3957 and then not Suppress_Style_Checks
(Body_Id
)
3959 -- No warnings within an instance
3961 and then not In_Instance
3963 -- No warnings for expression functions
3965 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3967 Style
.Body_With_No_Spec
(N
);
3970 New_Overloaded_Entity
(Body_Id
);
3972 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3973 Set_Acts_As_Spec
(N
);
3974 Generate_Definition
(Body_Id
);
3976 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3978 -- If the body is an entry wrapper created for an entry with
3979 -- preconditions, it must be compiled in the context of the
3980 -- enclosing synchronized object, because it may mention other
3981 -- operations of the type.
3983 if Is_Entry_Wrapper
(Body_Id
) then
3985 Prot
: constant Entity_Id
:= Etype
(First_Entity
(Body_Id
));
3988 Install_Declarations
(Prot
);
3992 Install_Formals
(Body_Id
);
3994 Push_Scope
(Body_Id
);
3997 -- For stubs and bodies with no previous spec, generate references to
4000 Generate_Reference_To_Formals
(Body_Id
);
4003 -- Entry barrier functions are generated outside the protected type and
4004 -- should not carry the SPARK_Mode of the enclosing context.
4006 if Nkind
(N
) = N_Subprogram_Body
4007 and then Is_Entry_Barrier_Function
(N
)
4011 -- The body is generated as part of expression function expansion. When
4012 -- the expression function appears in the visible declarations of a
4013 -- package, the body is added to the private declarations. Since both
4014 -- declarative lists may be subject to a different SPARK_Mode, inherit
4015 -- the mode of the spec.
4017 -- package P with SPARK_Mode is
4018 -- function Expr_Func ... is (...); -- original
4019 -- [function Expr_Func ...;] -- generated spec
4022 -- pragma SPARK_Mode (Off);
4023 -- [function Expr_Func ... is return ...;] -- generated body
4024 -- end P; -- mode is ON
4026 elsif not Comes_From_Source
(N
)
4027 and then Present
(Spec_Id
)
4028 and then Is_Expression_Function
(Spec_Id
)
4030 Set_SPARK_Pragma
(Body_Id
, SPARK_Pragma
(Spec_Id
));
4031 Set_SPARK_Pragma_Inherited
4032 (Body_Id
, SPARK_Pragma_Inherited
(Spec_Id
));
4034 -- Set the SPARK_Mode from the current context (may be overwritten later
4035 -- with explicit pragma). Exclude the case where the SPARK_Mode appears
4036 -- initially on a stand-alone subprogram body, but is then relocated to
4037 -- a generated corresponding spec. In this scenario the mode is shared
4038 -- between the spec and body.
4040 elsif No
(SPARK_Pragma
(Body_Id
)) then
4041 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
4042 Set_SPARK_Pragma_Inherited
(Body_Id
);
4045 -- A subprogram body may be instantiated or inlined at a later pass.
4046 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it
4047 -- applied to the initial declaration of the body.
4049 if Present
(Spec_Id
) then
4050 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
4051 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4055 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in
4056 -- case the body is instantiated or inlined later and out of context.
4057 -- The body uses this attribute to restore the value of the global
4060 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4061 Set_Ignore_SPARK_Mode_Pragmas
(Body_Id
);
4063 elsif Ignore_SPARK_Mode_Pragmas
(Body_Id
) then
4064 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4068 -- If this is the proper body of a stub, we must verify that the stub
4069 -- conforms to the body, and to the previous spec if one was present.
4070 -- We know already that the body conforms to that spec. This test is
4071 -- only required for subprograms that come from source.
4073 if Nkind
(Parent
(N
)) = N_Subunit
4074 and then Comes_From_Source
(N
)
4075 and then not Error_Posted
(Body_Id
)
4076 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
4077 N_Subprogram_Body_Stub
4080 Old_Id
: constant Entity_Id
:=
4082 (Specification
(Corresponding_Stub
(Parent
(N
))));
4084 Conformant
: Boolean := False;
4087 if No
(Spec_Id
) then
4088 Check_Fully_Conformant
(Body_Id
, Old_Id
);
4092 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
4094 if not Conformant
then
4096 -- The stub was taken to be a new declaration. Indicate that
4099 Set_Has_Completion
(Old_Id
, False);
4105 Set_Has_Completion
(Body_Id
);
4106 Check_Eliminated
(Body_Id
);
4108 -- Analyze any aspect specifications that appear on the subprogram body
4109 -- stub. Stop the analysis now as the stub does not have a declarative
4110 -- or a statement part, and it cannot be inlined.
4112 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4113 if Has_Aspects
(N
) then
4114 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4122 -- Note: Normally we don't do any inlining if expansion is off, since
4123 -- we won't generate code in any case. An exception arises in GNATprove
4124 -- mode where we want to expand some calls in place, even with expansion
4125 -- disabled, since the inlining eases formal verification.
4127 if not GNATprove_Mode
4128 and then Expander_Active
4129 and then Serious_Errors_Detected
= 0
4130 and then Present
(Spec_Id
)
4131 and then Has_Pragma_Inline
(Spec_Id
)
4133 -- Legacy implementation (relying on front-end inlining)
4135 if not Back_End_Inlining
then
4136 if (Has_Pragma_Inline_Always
(Spec_Id
)
4137 and then not Opt
.Disable_FE_Inline_Always
)
4138 or else (Front_End_Inlining
4139 and then not Opt
.Disable_FE_Inline
)
4141 Build_Body_To_Inline
(N
, Spec_Id
);
4144 -- New implementation (relying on back-end inlining)
4147 if Has_Pragma_Inline_Always
(Spec_Id
)
4148 or else Optimization_Level
> 0
4150 -- Handle function returning an unconstrained type
4152 if Comes_From_Source
(Body_Id
)
4153 and then Ekind
(Spec_Id
) = E_Function
4154 and then Returns_Unconstrained_Type
(Spec_Id
)
4156 -- If function builds in place, i.e. returns a limited type,
4157 -- inlining cannot be done.
4159 and then not Is_Limited_Type
(Etype
(Spec_Id
))
4161 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
4165 Subp_Body
: constant Node_Id
:=
4166 Unit_Declaration_Node
(Body_Id
);
4167 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
4170 -- Do not pass inlining to the backend if the subprogram
4171 -- has declarations or statements which cannot be inlined
4172 -- by the backend. This check is done here to emit an
4173 -- error instead of the generic warning message reported
4174 -- by the GCC backend (ie. "function might not be
4177 if Present
(Subp_Decl
)
4178 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
4182 elsif Has_Excluded_Statement
4185 (Handled_Statement_Sequence
(Subp_Body
)))
4189 -- If the backend inlining is available then at this
4190 -- stage we only have to mark the subprogram as inlined.
4191 -- The expander will take care of registering it in the
4192 -- table of subprograms inlined by the backend a part of
4193 -- processing calls to it (cf. Expand_Call)
4196 Set_Is_Inlined
(Spec_Id
);
4203 -- In GNATprove mode, inline only when there is a separate subprogram
4204 -- declaration for now, as inlining of subprogram bodies acting as
4205 -- declarations, or subprogram stubs, are not supported by front-end
4206 -- inlining. This inlining should occur after analysis of the body, so
4207 -- that it is known whether the value of SPARK_Mode, which can be
4208 -- defined by a pragma inside the body, is applicable to the body.
4209 -- Inlining can be disabled with switch -gnatdm
4211 elsif GNATprove_Mode
4212 and then Full_Analysis
4213 and then not Inside_A_Generic
4214 and then Present
(Spec_Id
)
4216 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
4217 and then Body_Has_SPARK_Mode_On
4218 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
4219 and then not Body_Has_Contract
4220 and then not Debug_Flag_M
4222 Build_Body_To_Inline
(N
, Spec_Id
);
4225 -- When generating code, inherited pre/postconditions are handled when
4226 -- expanding the corresponding contract.
4228 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
4229 -- of the specification we have to install the private withed units.
4230 -- This holds for child units as well.
4232 if Is_Compilation_Unit
(Body_Id
)
4233 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
4235 Install_Private_With_Clauses
(Body_Id
);
4238 Check_Anonymous_Return
;
4240 -- Set the Protected_Formal field of each extra formal of the protected
4241 -- subprogram to reference the corresponding extra formal of the
4242 -- subprogram that implements it. For regular formals this occurs when
4243 -- the protected subprogram's declaration is expanded, but the extra
4244 -- formals don't get created until the subprogram is frozen. We need to
4245 -- do this before analyzing the protected subprogram's body so that any
4246 -- references to the original subprogram's extra formals will be changed
4247 -- refer to the implementing subprogram's formals (see Expand_Formal).
4249 if Present
(Spec_Id
)
4250 and then Is_Protected_Type
(Scope
(Spec_Id
))
4251 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
4254 Impl_Subp
: constant Entity_Id
:=
4255 Protected_Body_Subprogram
(Spec_Id
);
4256 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
4257 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
4260 while Present
(Prot_Ext_Formal
) loop
4261 pragma Assert
(Present
(Impl_Ext_Formal
));
4262 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
4263 Next_Formal_With_Extras
(Prot_Ext_Formal
);
4264 Next_Formal_With_Extras
(Impl_Ext_Formal
);
4269 -- Now we can go on to analyze the body
4271 HSS
:= Handled_Statement_Sequence
(N
);
4272 Set_Actual_Subtypes
(N
, Current_Scope
);
4274 -- Add a declaration for the Protection object, renaming declarations
4275 -- for discriminals and privals and finally a declaration for the entry
4276 -- family index (if applicable). This form of early expansion is done
4277 -- when the Expander is active because Install_Private_Data_Declarations
4278 -- references entities which were created during regular expansion. The
4279 -- subprogram entity must come from source, and not be an internally
4280 -- generated subprogram.
4283 and then Present
(Prot_Typ
)
4284 and then Present
(Spec_Id
)
4285 and then Comes_From_Source
(Spec_Id
)
4286 and then not Is_Eliminated
(Spec_Id
)
4288 Install_Private_Data_Declarations
4289 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
4292 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
4293 -- may now appear in parameter and result profiles. Since the analysis
4294 -- of a subprogram body may use the parameter and result profile of the
4295 -- spec, swap any limited views with their non-limited counterpart.
4297 if Ada_Version
>= Ada_2012
and then Present
(Spec_Id
) then
4298 Exch_Views
:= Exchange_Limited_Views
(Spec_Id
);
4301 -- If the return type is an anonymous access type whose designated type
4302 -- is the limited view of a class-wide type and the non-limited view is
4303 -- available, update the return type accordingly.
4305 if Ada_Version
>= Ada_2005
and then Present
(Spec_Id
) then
4311 Rtyp
:= Etype
(Spec_Id
);
4313 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
4314 Etyp
:= Directly_Designated_Type
(Rtyp
);
4316 if Is_Class_Wide_Type
(Etyp
)
4317 and then From_Limited_With
(Etyp
)
4320 Set_Directly_Designated_Type
(Rtyp
, Available_View
(Etyp
));
4326 -- Analyze any aspect specifications that appear on the subprogram body
4328 if Has_Aspects
(N
) then
4329 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4332 Analyze_Declarations
(Declarations
(N
));
4334 -- Verify that the SPARK_Mode of the body agrees with that of its spec
4336 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
4337 if Present
(SPARK_Pragma
(Spec_Id
)) then
4338 if Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Spec_Id
)) = Off
4340 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
4342 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4343 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
4344 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
4346 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
4349 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
4353 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4354 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
4355 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
4357 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
4361 -- A subprogram body freezes its own contract. Analyze the contract
4362 -- after the declarations of the body have been processed as pragmas
4363 -- are now chained on the contract of the subprogram body.
4365 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
4367 -- Check completion, and analyze the statements
4370 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
4373 -- Deal with end of scope processing for the body
4375 Process_End_Label
(HSS
, 't', Current_Scope
);
4376 Update_Use_Clause_Chain
;
4379 -- If we are compiling an entry wrapper, remove the enclosing
4380 -- synchronized object from the stack.
4382 if Is_Entry_Wrapper
(Body_Id
) then
4386 Check_Subprogram_Order
(N
);
4387 Set_Analyzed
(Body_Id
);
4389 -- If we have a separate spec, then the analysis of the declarations
4390 -- caused the entities in the body to be chained to the spec id, but
4391 -- we want them chained to the body id. Only the formal parameters
4392 -- end up chained to the spec id in this case.
4394 if Present
(Spec_Id
) then
4396 -- We must conform to the categorization of our spec
4398 Validate_Categorization_Dependency
(N
, Spec_Id
);
4400 -- And if this is a child unit, the parent units must conform
4402 if Is_Child_Unit
(Spec_Id
) then
4403 Validate_Categorization_Dependency
4404 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
4407 -- Here is where we move entities from the spec to the body
4409 -- Case where there are entities that stay with the spec
4411 if Present
(Last_Real_Spec_Entity
) then
4413 -- No body entities (happens when the only real spec entities come
4414 -- from precondition and postcondition pragmas).
4416 if No
(Last_Entity
(Body_Id
)) then
4417 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
4419 -- Body entities present (formals), so chain stuff past them
4423 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
4426 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
4427 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4428 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
4430 -- Case where there are no spec entities, in this case there can be
4431 -- no body entities either, so just move everything.
4433 -- If the body is generated for an expression function, it may have
4434 -- been preanalyzed already, if 'access was applied to it.
4437 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
4438 N_Expression_Function
4440 pragma Assert
(No
(Last_Entity
(Body_Id
)));
4444 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
4445 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4446 Set_First_Entity
(Spec_Id
, Empty
);
4447 Set_Last_Entity
(Spec_Id
, Empty
);
4451 Check_Missing_Return
;
4453 -- Now we are going to check for variables that are never modified in
4454 -- the body of the procedure. But first we deal with a special case
4455 -- where we want to modify this check. If the body of the subprogram
4456 -- starts with a raise statement or its equivalent, or if the body
4457 -- consists entirely of a null statement, then it is pretty obvious that
4458 -- it is OK to not reference the parameters. For example, this might be
4459 -- the following common idiom for a stubbed function: statement of the
4460 -- procedure raises an exception. In particular this deals with the
4461 -- common idiom of a stubbed function, which appears something like:
4463 -- function F (A : Integer) return Some_Type;
4466 -- raise Program_Error;
4470 -- Here the purpose of X is simply to satisfy the annoying requirement
4471 -- in Ada that there be at least one return, and we certainly do not
4472 -- want to go posting warnings on X that it is not initialized. On
4473 -- the other hand, if X is entirely unreferenced that should still
4476 -- What we do is to detect these cases, and if we find them, flag the
4477 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
4478 -- suppress unwanted warnings. For the case of the function stub above
4479 -- we have a special test to set X as apparently assigned to suppress
4486 -- Skip call markers installed by the ABE mechanism, labels, and
4487 -- Push_xxx_Error_Label to find the first real statement.
4489 Stm
:= First
(Statements
(HSS
));
4490 while Nkind_In
(Stm
, N_Call_Marker
, N_Label
)
4491 or else Nkind
(Stm
) in N_Push_xxx_Label
4496 -- Do the test on the original statement before expansion
4499 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
4502 -- If explicit raise statement, turn on flag
4504 if Nkind
(Ostm
) = N_Raise_Statement
then
4505 Set_Trivial_Subprogram
(Stm
);
4507 -- If null statement, and no following statements, turn on flag
4509 elsif Nkind
(Stm
) = N_Null_Statement
4510 and then Comes_From_Source
(Stm
)
4511 and then No
(Next
(Stm
))
4513 Set_Trivial_Subprogram
(Stm
);
4515 -- Check for explicit call cases which likely raise an exception
4517 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
4518 if Is_Entity_Name
(Name
(Ostm
)) then
4520 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
4523 -- If the procedure is marked No_Return, then likely it
4524 -- raises an exception, but in any case it is not coming
4525 -- back here, so turn on the flag.
4528 and then Ekind
(Ent
) = E_Procedure
4529 and then No_Return
(Ent
)
4531 Set_Trivial_Subprogram
(Stm
);
4539 -- Check for variables that are never modified
4546 -- If there is a separate spec, then transfer Never_Set_In_Source
4547 -- flags from out parameters to the corresponding entities in the
4548 -- body. The reason we do that is we want to post error flags on
4549 -- the body entities, not the spec entities.
4551 if Present
(Spec_Id
) then
4552 E1
:= First_Entity
(Spec_Id
);
4553 while Present
(E1
) loop
4554 if Ekind
(E1
) = E_Out_Parameter
then
4555 E2
:= First_Entity
(Body_Id
);
4556 while Present
(E2
) loop
4557 exit when Chars
(E1
) = Chars
(E2
);
4561 if Present
(E2
) then
4562 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
4570 -- Check references in body
4572 Check_References
(Body_Id
);
4575 -- Check for nested subprogram, and mark outer level subprogram if so
4581 if Present
(Spec_Id
) then
4588 Ent
:= Enclosing_Subprogram
(Ent
);
4589 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
4592 if Present
(Ent
) then
4593 Set_Has_Nested_Subprogram
(Ent
);
4597 -- Restore the limited views in the spec, if any, to let the back end
4598 -- process it without running into circularities.
4600 if Exch_Views
/= No_Elist
then
4601 Restore_Limited_Views
(Exch_Views
);
4604 if Mask_Types
/= No_Elist
then
4605 Unmask_Unfrozen_Types
(Mask_Types
);
4608 if Present
(Desig_View
) then
4609 Set_Directly_Designated_Type
(Etype
(Spec_Id
), Desig_View
);
4613 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4614 Restore_Ghost_Mode
(Saved_GM
);
4615 end Analyze_Subprogram_Body_Helper
;
4617 ------------------------------------
4618 -- Analyze_Subprogram_Declaration --
4619 ------------------------------------
4621 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4622 Scop
: constant Entity_Id
:= Current_Scope
;
4623 Designator
: Entity_Id
;
4625 Is_Completion
: Boolean;
4626 -- Indicates whether a null procedure declaration is a completion
4629 -- Null procedures are not allowed in SPARK
4631 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4632 and then Null_Present
(Specification
(N
))
4634 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4636 -- Null procedures are allowed in protected types, following the
4637 -- recent AI12-0147.
4639 if Is_Protected_Type
(Current_Scope
)
4640 and then Ada_Version
< Ada_2012
4642 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4645 Analyze_Null_Procedure
(N
, Is_Completion
);
4647 -- The null procedure acts as a body, nothing further is needed
4649 if Is_Completion
then
4654 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4656 -- A reference may already have been generated for the unit name, in
4657 -- which case the following call is redundant. However it is needed for
4658 -- declarations that are the rewriting of an expression function.
4660 Generate_Definition
(Designator
);
4662 -- Set the SPARK mode from the current context (may be overwritten later
4663 -- with explicit pragma). This is not done for entry barrier functions
4664 -- because they are generated outside the protected type and should not
4665 -- carry the mode of the enclosing context.
4667 if Nkind
(N
) = N_Subprogram_Declaration
4668 and then Is_Entry_Barrier_Function
(N
)
4673 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4674 Set_SPARK_Pragma_Inherited
(Designator
);
4677 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
4678 -- the body of this subprogram is instantiated or inlined later and out
4679 -- of context. The body uses this attribute to restore the value of the
4682 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4683 Set_Ignore_SPARK_Mode_Pragmas
(Designator
);
4686 -- Preserve relevant elaboration-related attributes of the context which
4687 -- are no longer available or very expensive to recompute once analysis,
4688 -- resolution, and expansion are over.
4690 Mark_Elaboration_Attributes
4691 (N_Id
=> Designator
,
4694 if Debug_Flag_C
then
4695 Write_Str
("==> subprogram spec ");
4696 Write_Name
(Chars
(Designator
));
4697 Write_Str
(" from ");
4698 Write_Location
(Sloc
(N
));
4703 Validate_RCI_Subprogram_Declaration
(N
);
4704 New_Overloaded_Entity
(Designator
);
4705 Check_Delayed_Subprogram
(Designator
);
4707 -- If the type of the first formal of the current subprogram is a non-
4708 -- generic tagged private type, mark the subprogram as being a private
4709 -- primitive. Ditto if this is a function with controlling result, and
4710 -- the return type is currently private. In both cases, the type of the
4711 -- controlling argument or result must be in the current scope for the
4712 -- operation to be primitive.
4714 if Has_Controlling_Result
(Designator
)
4715 and then Is_Private_Type
(Etype
(Designator
))
4716 and then Scope
(Etype
(Designator
)) = Current_Scope
4717 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4719 Set_Is_Private_Primitive
(Designator
);
4721 elsif Present
(First_Formal
(Designator
)) then
4723 Formal_Typ
: constant Entity_Id
:=
4724 Etype
(First_Formal
(Designator
));
4726 Set_Is_Private_Primitive
(Designator
,
4727 Is_Tagged_Type
(Formal_Typ
)
4728 and then Scope
(Formal_Typ
) = Current_Scope
4729 and then Is_Private_Type
(Formal_Typ
)
4730 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4734 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4737 if Ada_Version
>= Ada_2005
4738 and then Comes_From_Source
(N
)
4739 and then Is_Dispatching_Operation
(Designator
)
4746 if Has_Controlling_Result
(Designator
) then
4747 Etyp
:= Etype
(Designator
);
4750 E
:= First_Entity
(Designator
);
4752 and then Is_Formal
(E
)
4753 and then not Is_Controlling_Formal
(E
)
4761 if Is_Access_Type
(Etyp
) then
4762 Etyp
:= Directly_Designated_Type
(Etyp
);
4765 if Is_Interface
(Etyp
)
4766 and then not Is_Abstract_Subprogram
(Designator
)
4767 and then not (Ekind
(Designator
) = E_Procedure
4768 and then Null_Present
(Specification
(N
)))
4770 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4772 -- Specialize error message based on procedures vs. functions,
4773 -- since functions can't be null subprograms.
4775 if Ekind
(Designator
) = E_Procedure
then
4777 ("interface procedure % must be abstract or null", N
);
4780 ("interface function % must be abstract", N
);
4786 -- What is the following code for, it used to be
4788 -- ??? Set_Suppress_Elaboration_Checks
4789 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4791 -- The following seems equivalent, but a bit dubious
4793 if Elaboration_Checks_Suppressed
(Designator
) then
4794 Set_Kill_Elaboration_Checks
(Designator
);
4797 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4798 Set_Categorization_From_Scope
(Designator
, Scop
);
4801 -- For a compilation unit, check for library-unit pragmas
4803 Push_Scope
(Designator
);
4804 Set_Categorization_From_Pragmas
(N
);
4805 Validate_Categorization_Dependency
(N
, Designator
);
4809 -- For a compilation unit, set body required. This flag will only be
4810 -- reset if a valid Import or Interface pragma is processed later on.
4812 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4813 Set_Body_Required
(Parent
(N
), True);
4815 if Ada_Version
>= Ada_2005
4816 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4817 and then Null_Present
(Specification
(N
))
4820 ("null procedure cannot be declared at library level", N
);
4824 Generate_Reference_To_Formals
(Designator
);
4825 Check_Eliminated
(Designator
);
4827 if Debug_Flag_C
then
4829 Write_Str
("<== subprogram spec ");
4830 Write_Name
(Chars
(Designator
));
4831 Write_Str
(" from ");
4832 Write_Location
(Sloc
(N
));
4836 if Is_Protected_Type
(Current_Scope
) then
4838 -- Indicate that this is a protected operation, because it may be
4839 -- used in subsequent declarations within the protected type.
4841 Set_Convention
(Designator
, Convention_Protected
);
4844 List_Inherited_Pre_Post_Aspects
(Designator
);
4846 if Has_Aspects
(N
) then
4847 Analyze_Aspect_Specifications
(N
, Designator
);
4849 end Analyze_Subprogram_Declaration
;
4851 --------------------------------------
4852 -- Analyze_Subprogram_Specification --
4853 --------------------------------------
4855 -- Reminder: N here really is a subprogram specification (not a subprogram
4856 -- declaration). This procedure is called to analyze the specification in
4857 -- both subprogram bodies and subprogram declarations (specs).
4859 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4860 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean;
4861 -- Determine whether entity E denotes the spec or body of an invariant
4864 ------------------------------------
4865 -- Is_Invariant_Procedure_Or_Body --
4866 ------------------------------------
4868 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean is
4869 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
4873 if Nkind
(Decl
) = N_Subprogram_Body
then
4874 Spec
:= Corresponding_Spec
(Decl
);
4881 and then Ekind
(Spec
) = E_Procedure
4882 and then (Is_Partial_Invariant_Procedure
(Spec
)
4883 or else Is_Invariant_Procedure
(Spec
));
4884 end Is_Invariant_Procedure_Or_Body
;
4888 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4889 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4891 -- Start of processing for Analyze_Subprogram_Specification
4894 -- User-defined operator is not allowed in SPARK, except as a renaming
4896 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4897 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4899 Check_SPARK_05_Restriction
4900 ("user-defined operator is not allowed", N
);
4903 -- Proceed with analysis. Do not emit a cross-reference entry if the
4904 -- specification comes from an expression function, because it may be
4905 -- the completion of a previous declaration. It is not, the cross-
4906 -- reference entry will be emitted for the new subprogram declaration.
4908 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4909 Generate_Definition
(Designator
);
4912 if Nkind
(N
) = N_Function_Specification
then
4913 Set_Ekind
(Designator
, E_Function
);
4914 Set_Mechanism
(Designator
, Default_Mechanism
);
4916 Set_Ekind
(Designator
, E_Procedure
);
4917 Set_Etype
(Designator
, Standard_Void_Type
);
4920 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4921 -- those subprograms which could be inlined in GNATprove mode (because
4922 -- Body_To_Inline is non-Empty) but should not be inlined.
4924 if GNATprove_Mode
then
4925 Set_Is_Inlined_Always
(Designator
);
4928 -- Introduce new scope for analysis of the formals and the return type
4930 Set_Scope
(Designator
, Current_Scope
);
4932 if Present
(Formals
) then
4933 Push_Scope
(Designator
);
4934 Process_Formals
(Formals
, N
);
4936 -- Check dimensions in N for formals with default expression
4938 Analyze_Dimension_Formals
(N
, Formals
);
4940 -- Ada 2005 (AI-345): If this is an overriding operation of an
4941 -- inherited interface operation, and the controlling type is
4942 -- a synchronized type, replace the type with its corresponding
4943 -- record, to match the proper signature of an overriding operation.
4944 -- Same processing for an access parameter whose designated type is
4945 -- derived from a synchronized interface.
4947 -- This modification is not done for invariant procedures because
4948 -- the corresponding record may not necessarely be visible when the
4949 -- concurrent type acts as the full view of a private type.
4952 -- type Prot is private with Type_Invariant => ...;
4953 -- procedure ConcInvariant (Obj : Prot);
4955 -- protected type Prot is ...;
4956 -- type Concurrent_Record_Prot is record ...;
4957 -- procedure ConcInvariant (Obj : Prot) is
4959 -- end ConcInvariant;
4962 -- In the example above, both the spec and body of the invariant
4963 -- procedure must utilize the private type as the controlling type.
4965 if Ada_Version
>= Ada_2005
4966 and then not Is_Invariant_Procedure_Or_Body
(Designator
)
4970 Formal_Typ
: Entity_Id
;
4971 Rec_Typ
: Entity_Id
;
4972 Desig_Typ
: Entity_Id
;
4975 Formal
:= First_Formal
(Designator
);
4976 while Present
(Formal
) loop
4977 Formal_Typ
:= Etype
(Formal
);
4979 if Is_Concurrent_Type
(Formal_Typ
)
4980 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4982 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4984 if Present
(Interfaces
(Rec_Typ
)) then
4985 Set_Etype
(Formal
, Rec_Typ
);
4988 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4989 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4991 if Is_Concurrent_Type
(Desig_Typ
)
4992 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4994 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4996 if Present
(Interfaces
(Rec_Typ
)) then
4997 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
5002 Next_Formal
(Formal
);
5009 -- The subprogram scope is pushed and popped around the processing of
5010 -- the return type for consistency with call above to Process_Formals
5011 -- (which itself can call Analyze_Return_Type), and to ensure that any
5012 -- itype created for the return type will be associated with the proper
5015 elsif Nkind
(N
) = N_Function_Specification
then
5016 Push_Scope
(Designator
);
5017 Analyze_Return_Type
(N
);
5023 if Nkind
(N
) = N_Function_Specification
then
5025 -- Deal with operator symbol case
5027 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
5028 Valid_Operator_Definition
(Designator
);
5031 May_Need_Actuals
(Designator
);
5033 -- Ada 2005 (AI-251): If the return type is abstract, verify that
5034 -- the subprogram is abstract also. This does not apply to renaming
5035 -- declarations, where abstractness is inherited, and to subprogram
5036 -- bodies generated for stream operations, which become renamings as
5039 -- In case of primitives associated with abstract interface types
5040 -- the check is applied later (see Analyze_Subprogram_Declaration).
5042 if not Nkind_In
(Original_Node
(Parent
(N
)),
5043 N_Abstract_Subprogram_Declaration
,
5044 N_Formal_Abstract_Subprogram_Declaration
,
5045 N_Subprogram_Renaming_Declaration
)
5047 if Is_Abstract_Type
(Etype
(Designator
))
5048 and then not Is_Interface
(Etype
(Designator
))
5051 ("function that returns abstract type must be abstract", N
);
5053 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
5054 -- access result whose designated type is abstract.
5056 elsif Ada_Version
>= Ada_2012
5057 and then Nkind
(Result_Definition
(N
)) = N_Access_Definition
5059 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
5060 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
5063 ("function whose access result designates abstract type "
5064 & "must be abstract", N
);
5070 end Analyze_Subprogram_Specification
;
5072 -----------------------
5073 -- Check_Conformance --
5074 -----------------------
5076 procedure Check_Conformance
5077 (New_Id
: Entity_Id
;
5079 Ctype
: Conformance_Type
;
5081 Conforms
: out Boolean;
5082 Err_Loc
: Node_Id
:= Empty
;
5083 Get_Inst
: Boolean := False;
5084 Skip_Controlling_Formals
: Boolean := False)
5086 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
5087 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
5088 -- If Errmsg is True, then processing continues to post an error message
5089 -- for conformance error on given node. Two messages are output. The
5090 -- first message points to the previous declaration with a general "no
5091 -- conformance" message. The second is the detailed reason, supplied as
5092 -- Msg. The parameter N provide information for a possible & insertion
5093 -- in the message, and also provides the location for posting the
5094 -- message in the absence of a specified Err_Loc location.
5096 function Conventions_Match
5098 Id2
: Entity_Id
) return Boolean;
5099 -- Determine whether the conventions of arbitrary entities Id1 and Id2
5102 -----------------------
5103 -- Conformance_Error --
5104 -----------------------
5106 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
5113 if No
(Err_Loc
) then
5119 Error_Msg_Sloc
:= Sloc
(Old_Id
);
5122 when Type_Conformant
=>
5123 Error_Msg_N
-- CODEFIX
5124 ("not type conformant with declaration#!", Enode
);
5126 when Mode_Conformant
=>
5127 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5129 ("not mode conformant with operation inherited#!",
5133 ("not mode conformant with declaration#!", Enode
);
5136 when Subtype_Conformant
=>
5137 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5139 ("not subtype conformant with operation inherited#!",
5143 ("not subtype conformant with declaration#!", Enode
);
5146 when Fully_Conformant
=>
5147 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5148 Error_Msg_N
-- CODEFIX
5149 ("not fully conformant with operation inherited#!",
5152 Error_Msg_N
-- CODEFIX
5153 ("not fully conformant with declaration#!", Enode
);
5157 Error_Msg_NE
(Msg
, Enode
, N
);
5159 end Conformance_Error
;
5161 -----------------------
5162 -- Conventions_Match --
5163 -----------------------
5165 function Conventions_Match
5167 Id2
: Entity_Id
) return Boolean
5170 -- Ignore the conventions of anonymous access-to-subprogram types
5171 -- and subprogram types because these are internally generated and
5172 -- the only way these may receive a convention is if they inherit
5173 -- the convention of a related subprogram.
5175 if Ekind_In
(Id1
, E_Anonymous_Access_Subprogram_Type
,
5178 Ekind_In
(Id2
, E_Anonymous_Access_Subprogram_Type
,
5183 -- Otherwise compare the conventions directly
5186 return Convention
(Id1
) = Convention
(Id2
);
5188 end Conventions_Match
;
5192 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
5193 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
5194 Old_Formal
: Entity_Id
;
5195 New_Formal
: Entity_Id
;
5196 Access_Types_Match
: Boolean;
5197 Old_Formal_Base
: Entity_Id
;
5198 New_Formal_Base
: Entity_Id
;
5200 -- Start of processing for Check_Conformance
5205 -- We need a special case for operators, since they don't appear
5208 if Ctype
= Type_Conformant
then
5209 if Ekind
(New_Id
) = E_Operator
5210 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
5216 -- If both are functions/operators, check return types conform
5218 if Old_Type
/= Standard_Void_Type
5220 New_Type
/= Standard_Void_Type
5222 -- If we are checking interface conformance we omit controlling
5223 -- arguments and result, because we are only checking the conformance
5224 -- of the remaining parameters.
5226 if Has_Controlling_Result
(Old_Id
)
5227 and then Has_Controlling_Result
(New_Id
)
5228 and then Skip_Controlling_Formals
5232 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
5233 if Ctype
>= Subtype_Conformant
5234 and then not Predicates_Match
(Old_Type
, New_Type
)
5237 ("\predicate of return type does not match!", New_Id
);
5240 ("\return type does not match!", New_Id
);
5246 -- Ada 2005 (AI-231): In case of anonymous access types check the
5247 -- null-exclusion and access-to-constant attributes match.
5249 if Ada_Version
>= Ada_2005
5250 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
5252 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
5253 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
5254 Is_Access_Constant
(Etype
(New_Type
)))
5256 Conformance_Error
("\return type does not match!", New_Id
);
5260 -- If either is a function/operator and the other isn't, error
5262 elsif Old_Type
/= Standard_Void_Type
5263 or else New_Type
/= Standard_Void_Type
5265 Conformance_Error
("\functions can only match functions!", New_Id
);
5269 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
5270 -- If this is a renaming as body, refine error message to indicate that
5271 -- the conflict is with the original declaration. If the entity is not
5272 -- frozen, the conventions don't have to match, the one of the renamed
5273 -- entity is inherited.
5275 if Ctype
>= Subtype_Conformant
then
5276 if not Conventions_Match
(Old_Id
, New_Id
) then
5277 if not Is_Frozen
(New_Id
) then
5280 elsif Present
(Err_Loc
)
5281 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
5282 and then Present
(Corresponding_Spec
(Err_Loc
))
5284 Error_Msg_Name_1
:= Chars
(New_Id
);
5286 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
5287 Conformance_Error
("\prior declaration for% has convention %!");
5290 Conformance_Error
("\calling conventions do not match!");
5295 elsif Is_Formal_Subprogram
(Old_Id
)
5296 or else Is_Formal_Subprogram
(New_Id
)
5298 Conformance_Error
("\formal subprograms not allowed!");
5303 -- Deal with parameters
5305 -- Note: we use the entity information, rather than going directly
5306 -- to the specification in the tree. This is not only simpler, but
5307 -- absolutely necessary for some cases of conformance tests between
5308 -- operators, where the declaration tree simply does not exist.
5310 Old_Formal
:= First_Formal
(Old_Id
);
5311 New_Formal
:= First_Formal
(New_Id
);
5312 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
5313 if Is_Controlling_Formal
(Old_Formal
)
5314 and then Is_Controlling_Formal
(New_Formal
)
5315 and then Skip_Controlling_Formals
5317 -- The controlling formals will have different types when
5318 -- comparing an interface operation with its match, but both
5319 -- or neither must be access parameters.
5321 if Is_Access_Type
(Etype
(Old_Formal
))
5323 Is_Access_Type
(Etype
(New_Formal
))
5325 goto Skip_Controlling_Formal
;
5328 ("\access parameter does not match!", New_Formal
);
5332 -- Ada 2012: Mode conformance also requires that formal parameters
5333 -- be both aliased, or neither.
5335 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
5336 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
5338 ("\aliased parameter mismatch!", New_Formal
);
5342 if Ctype
= Fully_Conformant
then
5344 -- Names must match. Error message is more accurate if we do
5345 -- this before checking that the types of the formals match.
5347 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
5348 Conformance_Error
("\name& does not match!", New_Formal
);
5350 -- Set error posted flag on new formal as well to stop
5351 -- junk cascaded messages in some cases.
5353 Set_Error_Posted
(New_Formal
);
5357 -- Null exclusion must match
5359 if Null_Exclusion_Present
(Parent
(Old_Formal
))
5361 Null_Exclusion_Present
(Parent
(New_Formal
))
5363 -- Only give error if both come from source. This should be
5364 -- investigated some time, since it should not be needed ???
5366 if Comes_From_Source
(Old_Formal
)
5368 Comes_From_Source
(New_Formal
)
5371 ("\null exclusion for& does not match", New_Formal
);
5373 -- Mark error posted on the new formal to avoid duplicated
5374 -- complaint about types not matching.
5376 Set_Error_Posted
(New_Formal
);
5381 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
5382 -- case occurs whenever a subprogram is being renamed and one of its
5383 -- parameters imposes a null exclusion. For example:
5385 -- type T is null record;
5386 -- type Acc_T is access T;
5387 -- subtype Acc_T_Sub is Acc_T;
5389 -- procedure P (Obj : not null Acc_T_Sub); -- itype
5390 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
5393 Old_Formal_Base
:= Etype
(Old_Formal
);
5394 New_Formal_Base
:= Etype
(New_Formal
);
5397 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
5398 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
5401 Access_Types_Match
:= Ada_Version
>= Ada_2005
5403 -- Ensure that this rule is only applied when New_Id is a
5404 -- renaming of Old_Id.
5406 and then Nkind
(Parent
(Parent
(New_Id
))) =
5407 N_Subprogram_Renaming_Declaration
5408 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
5409 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
5410 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
5412 -- Now handle the allowed access-type case
5414 and then Is_Access_Type
(Old_Formal_Base
)
5415 and then Is_Access_Type
(New_Formal_Base
)
5417 -- The type kinds must match. The only exception occurs with
5418 -- multiple generics of the form:
5421 -- type F is private; type A is private;
5422 -- type F_Ptr is access F; type A_Ptr is access A;
5423 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
5424 -- package F_Pack is ... package A_Pack is
5425 -- package F_Inst is
5426 -- new F_Pack (A, A_Ptr, A_P);
5428 -- When checking for conformance between the parameters of A_P
5429 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
5430 -- because the compiler has transformed A_Ptr into a subtype of
5431 -- F_Ptr. We catch this case in the code below.
5433 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
5435 (Is_Generic_Type
(Old_Formal_Base
)
5436 and then Is_Generic_Type
(New_Formal_Base
)
5437 and then Is_Internal
(New_Formal_Base
)
5438 and then Etype
(Etype
(New_Formal_Base
)) =
5440 and then Directly_Designated_Type
(Old_Formal_Base
) =
5441 Directly_Designated_Type
(New_Formal_Base
)
5442 and then ((Is_Itype
(Old_Formal_Base
)
5443 and then Can_Never_Be_Null
(Old_Formal_Base
))
5445 (Is_Itype
(New_Formal_Base
)
5446 and then Can_Never_Be_Null
(New_Formal_Base
)));
5448 -- Types must always match. In the visible part of an instance,
5449 -- usual overloading rules for dispatching operations apply, and
5450 -- we check base types (not the actual subtypes).
5452 if In_Instance_Visible_Part
5453 and then Is_Dispatching_Operation
(New_Id
)
5455 if not Conforming_Types
5456 (T1
=> Base_Type
(Etype
(Old_Formal
)),
5457 T2
=> Base_Type
(Etype
(New_Formal
)),
5459 Get_Inst
=> Get_Inst
)
5460 and then not Access_Types_Match
5462 Conformance_Error
("\type of & does not match!", New_Formal
);
5466 elsif not Conforming_Types
5467 (T1
=> Old_Formal_Base
,
5468 T2
=> New_Formal_Base
,
5470 Get_Inst
=> Get_Inst
)
5471 and then not Access_Types_Match
5473 -- Don't give error message if old type is Any_Type. This test
5474 -- avoids some cascaded errors, e.g. in case of a bad spec.
5476 if Errmsg
and then Old_Formal_Base
= Any_Type
then
5479 if Ctype
>= Subtype_Conformant
5481 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
5484 ("\predicate of & does not match!", New_Formal
);
5487 ("\type of & does not match!", New_Formal
);
5489 if not Dimensions_Match
(Old_Formal_Base
, New_Formal_Base
)
5491 Error_Msg_N
("\dimensions mismatch!", New_Formal
);
5499 -- For mode conformance, mode must match
5501 if Ctype
>= Mode_Conformant
then
5502 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
5503 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
5504 or else not Is_Primitive_Wrapper
(New_Id
)
5506 Conformance_Error
("\mode of & does not match!", New_Formal
);
5510 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
5512 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
5514 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
5517 ("\mode of & does not match!", New_Formal
);
5524 -- Part of mode conformance for access types is having the same
5525 -- constant modifier.
5527 elsif Access_Types_Match
5528 and then Is_Access_Constant
(Old_Formal_Base
) /=
5529 Is_Access_Constant
(New_Formal_Base
)
5532 ("\constant modifier does not match!", New_Formal
);
5537 if Ctype
>= Subtype_Conformant
then
5539 -- Ada 2005 (AI-231): In case of anonymous access types check
5540 -- the null-exclusion and access-to-constant attributes must
5541 -- match. For null exclusion, we test the types rather than the
5542 -- formals themselves, since the attribute is only set reliably
5543 -- on the formals in the Ada 95 case, and we exclude the case
5544 -- where Old_Formal is marked as controlling, to avoid errors
5545 -- when matching completing bodies with dispatching declarations
5546 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
5548 if Ada_Version
>= Ada_2005
5549 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
5550 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
5552 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
5553 Can_Never_Be_Null
(Etype
(New_Formal
))
5555 not Is_Controlling_Formal
(Old_Formal
))
5557 Is_Access_Constant
(Etype
(Old_Formal
)) /=
5558 Is_Access_Constant
(Etype
(New_Formal
)))
5560 -- Do not complain if error already posted on New_Formal. This
5561 -- avoids some redundant error messages.
5563 and then not Error_Posted
(New_Formal
)
5565 -- It is allowed to omit the null-exclusion in case of stream
5566 -- attribute subprograms. We recognize stream subprograms
5567 -- through their TSS-generated suffix.
5570 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
5573 if TSS_Name
/= TSS_Stream_Read
5574 and then TSS_Name
/= TSS_Stream_Write
5575 and then TSS_Name
/= TSS_Stream_Input
5576 and then TSS_Name
/= TSS_Stream_Output
5578 -- Here we have a definite conformance error. It is worth
5579 -- special casing the error message for the case of a
5580 -- controlling formal (which excludes null).
5582 if Is_Controlling_Formal
(New_Formal
) then
5583 Error_Msg_Node_2
:= Scope
(New_Formal
);
5585 ("\controlling formal & of & excludes null, "
5586 & "declaration must exclude null as well",
5589 -- Normal case (couldn't we give more detail here???)
5593 ("\type of & does not match!", New_Formal
);
5602 -- Full conformance checks
5604 if Ctype
= Fully_Conformant
then
5606 -- We have checked already that names match
5608 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
5610 -- Check default expressions for in parameters
5613 NewD
: constant Boolean :=
5614 Present
(Default_Value
(New_Formal
));
5615 OldD
: constant Boolean :=
5616 Present
(Default_Value
(Old_Formal
));
5618 if NewD
or OldD
then
5620 -- The old default value has been analyzed because the
5621 -- current full declaration will have frozen everything
5622 -- before. The new default value has not been analyzed,
5623 -- so analyze it now before we check for conformance.
5626 Push_Scope
(New_Id
);
5627 Preanalyze_Spec_Expression
5628 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5632 if not (NewD
and OldD
)
5633 or else not Fully_Conformant_Expressions
5634 (Default_Value
(Old_Formal
),
5635 Default_Value
(New_Formal
))
5638 ("\default expression for & does not match!",
5647 -- A couple of special checks for Ada 83 mode. These checks are
5648 -- skipped if either entity is an operator in package Standard,
5649 -- or if either old or new instance is not from the source program.
5651 if Ada_Version
= Ada_83
5652 and then Sloc
(Old_Id
) > Standard_Location
5653 and then Sloc
(New_Id
) > Standard_Location
5654 and then Comes_From_Source
(Old_Id
)
5655 and then Comes_From_Source
(New_Id
)
5658 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5659 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5662 -- Explicit IN must be present or absent in both cases. This
5663 -- test is required only in the full conformance case.
5665 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5666 and then Ctype
= Fully_Conformant
5669 ("\(Ada 83) IN must appear in both declarations",
5674 -- Grouping (use of comma in param lists) must be the same
5675 -- This is where we catch a misconformance like:
5678 -- A : Integer; B : Integer
5680 -- which are represented identically in the tree except
5681 -- for the setting of the flags More_Ids and Prev_Ids.
5683 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5684 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5687 ("\grouping of & does not match!", New_Formal
);
5693 -- This label is required when skipping controlling formals
5695 <<Skip_Controlling_Formal
>>
5697 Next_Formal
(Old_Formal
);
5698 Next_Formal
(New_Formal
);
5701 if Present
(Old_Formal
) then
5702 Conformance_Error
("\too few parameters!");
5705 elsif Present
(New_Formal
) then
5706 Conformance_Error
("\too many parameters!", New_Formal
);
5709 end Check_Conformance
;
5711 -----------------------
5712 -- Check_Conventions --
5713 -----------------------
5715 procedure Check_Conventions
(Typ
: Entity_Id
) is
5716 Ifaces_List
: Elist_Id
;
5718 procedure Check_Convention
(Op
: Entity_Id
);
5719 -- Verify that the convention of inherited dispatching operation Op is
5720 -- consistent among all subprograms it overrides. In order to minimize
5721 -- the search, Search_From is utilized to designate a specific point in
5722 -- the list rather than iterating over the whole list once more.
5724 ----------------------
5725 -- Check_Convention --
5726 ----------------------
5728 procedure Check_Convention
(Op
: Entity_Id
) is
5729 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5730 Iface_Conv
: Convention_Id
;
5731 Iface_Elmt
: Elmt_Id
;
5732 Iface_Prim_Elmt
: Elmt_Id
;
5733 Iface_Prim
: Entity_Id
;
5736 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5737 while Present
(Iface_Elmt
) loop
5739 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5740 while Present
(Iface_Prim_Elmt
) loop
5741 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5742 Iface_Conv
:= Convention
(Iface_Prim
);
5744 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5745 and then Iface_Conv
/= Op_Conv
5748 ("inconsistent conventions in primitive operations", Typ
);
5750 Error_Msg_Name_1
:= Chars
(Op
);
5751 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5752 Error_Msg_Sloc
:= Sloc
(Op
);
5754 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5755 if not Present
(Overridden_Operation
(Op
)) then
5756 Error_Msg_N
("\\primitive % defined #", Typ
);
5759 ("\\overriding operation % with "
5760 & "convention % defined #", Typ
);
5763 else pragma Assert
(Present
(Alias
(Op
)));
5764 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5765 Error_Msg_N
("\\inherited operation % with "
5766 & "convention % defined #", Typ
);
5769 Error_Msg_Name_1
:= Chars
(Op
);
5770 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5771 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5772 Error_Msg_N
("\\overridden operation % with "
5773 & "convention % defined #", Typ
);
5775 -- Avoid cascading errors
5780 Next_Elmt
(Iface_Prim_Elmt
);
5783 Next_Elmt
(Iface_Elmt
);
5785 end Check_Convention
;
5789 Prim_Op
: Entity_Id
;
5790 Prim_Op_Elmt
: Elmt_Id
;
5792 -- Start of processing for Check_Conventions
5795 if not Has_Interfaces
(Typ
) then
5799 Collect_Interfaces
(Typ
, Ifaces_List
);
5801 -- The algorithm checks every overriding dispatching operation against
5802 -- all the corresponding overridden dispatching operations, detecting
5803 -- differences in conventions.
5805 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5806 while Present
(Prim_Op_Elmt
) loop
5807 Prim_Op
:= Node
(Prim_Op_Elmt
);
5809 -- A small optimization: skip the predefined dispatching operations
5810 -- since they always have the same convention.
5812 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5813 Check_Convention
(Prim_Op
);
5816 Next_Elmt
(Prim_Op_Elmt
);
5818 end Check_Conventions
;
5820 ------------------------------
5821 -- Check_Delayed_Subprogram --
5822 ------------------------------
5824 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5827 procedure Possible_Freeze
(T
: Entity_Id
);
5828 -- T is the type of either a formal parameter or of the return type.
5829 -- If T is not yet frozen and needs a delayed freeze, then the
5830 -- subprogram itself must be delayed.
5832 ---------------------
5833 -- Possible_Freeze --
5834 ---------------------
5836 procedure Possible_Freeze
(T
: Entity_Id
) is
5838 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5839 Set_Has_Delayed_Freeze
(Designator
);
5841 elsif Is_Access_Type
(T
)
5842 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5843 and then not Is_Frozen
(Designated_Type
(T
))
5845 Set_Has_Delayed_Freeze
(Designator
);
5848 end Possible_Freeze
;
5850 -- Start of processing for Check_Delayed_Subprogram
5853 -- All subprograms, including abstract subprograms, may need a freeze
5854 -- node if some formal type or the return type needs one.
5856 Possible_Freeze
(Etype
(Designator
));
5857 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5859 -- Need delayed freeze if any of the formal types themselves need
5860 -- a delayed freeze and are not yet frozen.
5862 F
:= First_Formal
(Designator
);
5863 while Present
(F
) loop
5864 Possible_Freeze
(Etype
(F
));
5865 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5869 -- Mark functions that return by reference. Note that it cannot be
5870 -- done for delayed_freeze subprograms because the underlying
5871 -- returned type may not be known yet (for private types)
5873 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5875 Typ
: constant Entity_Id
:= Etype
(Designator
);
5876 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5878 if Is_Limited_View
(Typ
) then
5879 Set_Returns_By_Ref
(Designator
);
5880 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5881 Set_Returns_By_Ref
(Designator
);
5885 end Check_Delayed_Subprogram
;
5887 ------------------------------------
5888 -- Check_Discriminant_Conformance --
5889 ------------------------------------
5891 procedure Check_Discriminant_Conformance
5896 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5897 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5898 New_Discr_Id
: Entity_Id
;
5899 New_Discr_Type
: Entity_Id
;
5901 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5902 -- Post error message for conformance error on given node. Two messages
5903 -- are output. The first points to the previous declaration with a
5904 -- general "no conformance" message. The second is the detailed reason,
5905 -- supplied as Msg. The parameter N provide information for a possible
5906 -- & insertion in the message.
5908 -----------------------
5909 -- Conformance_Error --
5910 -----------------------
5912 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5914 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5915 Error_Msg_N
-- CODEFIX
5916 ("not fully conformant with declaration#!", N
);
5917 Error_Msg_NE
(Msg
, N
, N
);
5918 end Conformance_Error
;
5920 -- Start of processing for Check_Discriminant_Conformance
5923 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5924 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5926 -- The subtype mark of the discriminant on the full type has not
5927 -- been analyzed so we do it here. For an access discriminant a new
5930 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5932 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5935 Analyze
(Discriminant_Type
(New_Discr
));
5936 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5938 -- Ada 2005: if the discriminant definition carries a null
5939 -- exclusion, create an itype to check properly for consistency
5940 -- with partial declaration.
5942 if Is_Access_Type
(New_Discr_Type
)
5943 and then Null_Exclusion_Present
(New_Discr
)
5946 Create_Null_Excluding_Itype
5947 (T
=> New_Discr_Type
,
5948 Related_Nod
=> New_Discr
,
5949 Scope_Id
=> Current_Scope
);
5953 if not Conforming_Types
5954 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5956 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5959 -- Treat the new discriminant as an occurrence of the old one,
5960 -- for navigation purposes, and fill in some semantic
5961 -- information, for completeness.
5963 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5964 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5965 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5970 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5971 Conformance_Error
("name & does not match!", New_Discr_Id
);
5975 -- Default expressions must match
5978 NewD
: constant Boolean :=
5979 Present
(Expression
(New_Discr
));
5980 OldD
: constant Boolean :=
5981 Present
(Expression
(Parent
(Old_Discr
)));
5984 if NewD
or OldD
then
5986 -- The old default value has been analyzed and expanded,
5987 -- because the current full declaration will have frozen
5988 -- everything before. The new default values have not been
5989 -- expanded, so expand now to check conformance.
5992 Preanalyze_Spec_Expression
5993 (Expression
(New_Discr
), New_Discr_Type
);
5996 if not (NewD
and OldD
)
5997 or else not Fully_Conformant_Expressions
5998 (Expression
(Parent
(Old_Discr
)),
5999 Expression
(New_Discr
))
6003 ("default expression for & does not match!",
6010 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
6012 if Ada_Version
= Ada_83
then
6014 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
6017 -- Grouping (use of comma in param lists) must be the same
6018 -- This is where we catch a misconformance like:
6021 -- A : Integer; B : Integer
6023 -- which are represented identically in the tree except
6024 -- for the setting of the flags More_Ids and Prev_Ids.
6026 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
6027 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
6030 ("grouping of & does not match!", New_Discr_Id
);
6036 Next_Discriminant
(Old_Discr
);
6040 if Present
(Old_Discr
) then
6041 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
6044 elsif Present
(New_Discr
) then
6046 ("too many discriminants!", Defining_Identifier
(New_Discr
));
6049 end Check_Discriminant_Conformance
;
6051 ----------------------------
6052 -- Check_Fully_Conformant --
6053 ----------------------------
6055 procedure Check_Fully_Conformant
6056 (New_Id
: Entity_Id
;
6058 Err_Loc
: Node_Id
:= Empty
)
6061 pragma Warnings
(Off
, Result
);
6064 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
6065 end Check_Fully_Conformant
;
6067 --------------------------
6068 -- Check_Limited_Return --
6069 --------------------------
6071 procedure Check_Limited_Return
6077 -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and
6078 -- replaced by anonymous access results. This is an incompatibility with
6079 -- Ada 95. Not clear whether this should be enforced yet or perhaps
6080 -- controllable with special switch. ???
6082 -- A limited interface that is not immutably limited is OK
6084 if Is_Limited_Interface
(R_Type
)
6086 not (Is_Task_Interface
(R_Type
)
6087 or else Is_Protected_Interface
(R_Type
)
6088 or else Is_Synchronized_Interface
(R_Type
))
6092 elsif Is_Limited_Type
(R_Type
)
6093 and then not Is_Interface
(R_Type
)
6094 and then Comes_From_Source
(N
)
6095 and then not In_Instance_Body
6096 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
6098 -- Error in Ada 2005
6100 if Ada_Version
>= Ada_2005
6101 and then not Debug_Flag_Dot_L
6102 and then not GNAT_Mode
6105 ("(Ada 2005) cannot copy object of a limited type "
6106 & "(RM-2005 6.5(5.5/2))", Expr
);
6108 if Is_Limited_View
(R_Type
) then
6110 ("\return by reference not permitted in Ada 2005", Expr
);
6113 -- Warn in Ada 95 mode, to give folks a heads up about this
6116 -- In GNAT mode, this is just a warning, to allow it to be evilly
6117 -- turned off. Otherwise it is a real error.
6119 -- In a generic context, simplify the warning because it makes no
6120 -- sense to discuss pass-by-reference or copy.
6122 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
6123 if Inside_A_Generic
then
6125 ("return of limited object not permitted in Ada 2005 "
6126 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6128 elsif Is_Limited_View
(R_Type
) then
6130 ("return by reference not permitted in Ada 2005 "
6131 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6134 ("cannot copy object of a limited type in Ada 2005 "
6135 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6138 -- Ada 95 mode, and compatibility warnings disabled
6141 pragma Assert
(Ada_Version
<= Ada_95
);
6142 pragma Assert
(not (Warn_On_Ada_2005_Compatibility
or GNAT_Mode
));
6143 return; -- skip continuation messages below
6146 if not Inside_A_Generic
then
6148 ("\consider switching to return of access type", Expr
);
6149 Explain_Limited_Type
(R_Type
, Expr
);
6152 end Check_Limited_Return
;
6154 ---------------------------
6155 -- Check_Mode_Conformant --
6156 ---------------------------
6158 procedure Check_Mode_Conformant
6159 (New_Id
: Entity_Id
;
6161 Err_Loc
: Node_Id
:= Empty
;
6162 Get_Inst
: Boolean := False)
6165 pragma Warnings
(Off
, Result
);
6168 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
6169 end Check_Mode_Conformant
;
6171 --------------------------------
6172 -- Check_Overriding_Indicator --
6173 --------------------------------
6175 procedure Check_Overriding_Indicator
6177 Overridden_Subp
: Entity_Id
;
6178 Is_Primitive
: Boolean)
6184 -- No overriding indicator for literals
6186 if Ekind
(Subp
) = E_Enumeration_Literal
then
6189 elsif Ekind
(Subp
) = E_Entry
then
6190 Decl
:= Parent
(Subp
);
6192 -- No point in analyzing a malformed operator
6194 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
6195 and then Error_Posted
(Subp
)
6200 Decl
:= Unit_Declaration_Node
(Subp
);
6203 if Nkind_In
(Decl
, N_Subprogram_Body
,
6204 N_Subprogram_Body_Stub
,
6205 N_Subprogram_Declaration
,
6206 N_Abstract_Subprogram_Declaration
,
6207 N_Subprogram_Renaming_Declaration
)
6209 Spec
:= Specification
(Decl
);
6211 elsif Nkind
(Decl
) = N_Entry_Declaration
then
6218 -- The overriding operation is type conformant with the overridden one,
6219 -- but the names of the formals are not required to match. If the names
6220 -- appear permuted in the overriding operation, this is a possible
6221 -- source of confusion that is worth diagnosing. Controlling formals
6222 -- often carry names that reflect the type, and it is not worthwhile
6223 -- requiring that their names match.
6225 if Present
(Overridden_Subp
)
6226 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
6233 Form1
:= First_Formal
(Subp
);
6234 Form2
:= First_Formal
(Overridden_Subp
);
6236 -- If the overriding operation is a synchronized operation, skip
6237 -- the first parameter of the overridden operation, which is
6238 -- implicit in the new one. If the operation is declared in the
6239 -- body it is not primitive and all formals must match.
6241 if Is_Concurrent_Type
(Scope
(Subp
))
6242 and then Is_Tagged_Type
(Scope
(Subp
))
6243 and then not Has_Completion
(Scope
(Subp
))
6245 Form2
:= Next_Formal
(Form2
);
6248 if Present
(Form1
) then
6249 Form1
:= Next_Formal
(Form1
);
6250 Form2
:= Next_Formal
(Form2
);
6253 while Present
(Form1
) loop
6254 if not Is_Controlling_Formal
(Form1
)
6255 and then Present
(Next_Formal
(Form2
))
6256 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
6258 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
6259 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
6261 ("& does not match corresponding formal of&#",
6266 Next_Formal
(Form1
);
6267 Next_Formal
(Form2
);
6272 -- If there is an overridden subprogram, then check that there is no
6273 -- "not overriding" indicator, and mark the subprogram as overriding.
6274 -- This is not done if the overridden subprogram is marked as hidden,
6275 -- which can occur for the case of inherited controlled operations
6276 -- (see Derive_Subprogram), unless the inherited subprogram's parent
6277 -- subprogram is not itself hidden. (Note: This condition could probably
6278 -- be simplified, leaving out the testing for the specific controlled
6279 -- cases, but it seems safer and clearer this way, and echoes similar
6280 -- special-case tests of this kind in other places.)
6282 if Present
(Overridden_Subp
)
6283 and then (not Is_Hidden
(Overridden_Subp
)
6285 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
6288 and then Present
(Alias
(Overridden_Subp
))
6289 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
6291 if Must_Not_Override
(Spec
) then
6292 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
6294 if Ekind
(Subp
) = E_Entry
then
6296 ("entry & overrides inherited operation #", Spec
, Subp
);
6299 ("subprogram & overrides inherited operation #", Spec
, Subp
);
6302 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
6303 -- as an extension of Root_Controlled, and thus has a useless Adjust
6304 -- operation. This operation should not be inherited by other limited
6305 -- controlled types. An explicit Adjust for them is not overriding.
6307 elsif Must_Override
(Spec
)
6308 and then Chars
(Overridden_Subp
) = Name_Adjust
6309 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
6310 and then Present
(Alias
(Overridden_Subp
))
6311 and then In_Predefined_Unit
(Alias
(Overridden_Subp
))
6314 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))));
6315 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6317 elsif Is_Subprogram
(Subp
) then
6318 if Is_Init_Proc
(Subp
) then
6321 elsif No
(Overridden_Operation
(Subp
)) then
6323 -- For entities generated by Derive_Subprograms the overridden
6324 -- operation is the inherited primitive (which is available
6325 -- through the attribute alias)
6327 if (Is_Dispatching_Operation
(Subp
)
6328 or else Is_Dispatching_Operation
(Overridden_Subp
))
6329 and then not Comes_From_Source
(Overridden_Subp
)
6330 and then Find_Dispatching_Type
(Overridden_Subp
) =
6331 Find_Dispatching_Type
(Subp
)
6332 and then Present
(Alias
(Overridden_Subp
))
6333 and then Comes_From_Source
(Alias
(Overridden_Subp
))
6335 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
6336 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
6339 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
6340 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
6345 -- If primitive flag is set or this is a protected operation, then
6346 -- the operation is overriding at the point of its declaration, so
6347 -- warn if necessary. Otherwise it may have been declared before the
6348 -- operation it overrides and no check is required.
6351 and then not Must_Override
(Spec
)
6352 and then (Is_Primitive
6353 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
6355 Style
.Missing_Overriding
(Decl
, Subp
);
6358 -- If Subp is an operator, it may override a predefined operation, if
6359 -- it is defined in the same scope as the type to which it applies.
6360 -- In that case Overridden_Subp is empty because of our implicit
6361 -- representation for predefined operators. We have to check whether the
6362 -- signature of Subp matches that of a predefined operator. Note that
6363 -- first argument provides the name of the operator, and the second
6364 -- argument the signature that may match that of a standard operation.
6365 -- If the indicator is overriding, then the operator must match a
6366 -- predefined signature, because we know already that there is no
6367 -- explicit overridden operation.
6369 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
6370 if Must_Not_Override
(Spec
) then
6372 -- If this is not a primitive or a protected subprogram, then
6373 -- "not overriding" is illegal.
6376 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6378 Error_Msg_N
("overriding indicator only allowed "
6379 & "if subprogram is primitive", Subp
);
6381 elsif Can_Override_Operator
(Subp
) then
6383 ("subprogram& overrides predefined operator ", Spec
, Subp
);
6386 elsif Must_Override
(Spec
) then
6387 if No
(Overridden_Operation
(Subp
))
6388 and then not Can_Override_Operator
(Subp
)
6390 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6393 elsif not Error_Posted
(Subp
)
6394 and then Style_Check
6395 and then Can_Override_Operator
(Subp
)
6396 and then not In_Predefined_Unit
(Subp
)
6398 -- If style checks are enabled, indicate that the indicator is
6399 -- missing. However, at the point of declaration, the type of
6400 -- which this is a primitive operation may be private, in which
6401 -- case the indicator would be premature.
6403 if Has_Private_Declaration
(Etype
(Subp
))
6404 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
6408 Style
.Missing_Overriding
(Decl
, Subp
);
6412 elsif Must_Override
(Spec
) then
6413 if Ekind
(Subp
) = E_Entry
then
6414 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
6416 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6419 -- If the operation is marked "not overriding" and it's not primitive
6420 -- then an error is issued, unless this is an operation of a task or
6421 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
6422 -- has been specified have already been checked above.
6424 elsif Must_Not_Override
(Spec
)
6425 and then not Is_Primitive
6426 and then Ekind
(Subp
) /= E_Entry
6427 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6430 ("overriding indicator only allowed if subprogram is primitive",
6434 end Check_Overriding_Indicator
;
6440 -- Note: this procedure needs to know far too much about how the expander
6441 -- messes with exceptions. The use of the flag Exception_Junk and the
6442 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
6443 -- works, but is not very clean. It would be better if the expansion
6444 -- routines would leave Original_Node working nicely, and we could use
6445 -- Original_Node here to ignore all the peculiar expander messing ???
6447 procedure Check_Returns
6451 Proc
: Entity_Id
:= Empty
)
6455 procedure Check_Statement_Sequence
(L
: List_Id
);
6456 -- Internal recursive procedure to check a list of statements for proper
6457 -- termination by a return statement (or a transfer of control or a
6458 -- compound statement that is itself internally properly terminated).
6460 ------------------------------
6461 -- Check_Statement_Sequence --
6462 ------------------------------
6464 procedure Check_Statement_Sequence
(L
: List_Id
) is
6469 function Assert_False
return Boolean;
6470 -- Returns True if Last_Stm is a pragma Assert (False) that has been
6471 -- rewritten as a null statement when assertions are off. The assert
6472 -- is not active, but it is still enough to kill the warning.
6478 function Assert_False
return Boolean is
6479 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
6482 if Nkind
(Orig
) = N_Pragma
6483 and then Pragma_Name
(Orig
) = Name_Assert
6484 and then not Error_Posted
(Orig
)
6487 Arg
: constant Node_Id
:=
6488 First
(Pragma_Argument_Associations
(Orig
));
6489 Exp
: constant Node_Id
:= Expression
(Arg
);
6491 return Nkind
(Exp
) = N_Identifier
6492 and then Chars
(Exp
) = Name_False
;
6502 Raise_Exception_Call
: Boolean;
6503 -- Set True if statement sequence terminated by Raise_Exception call
6504 -- or a Reraise_Occurrence call.
6506 -- Start of processing for Check_Statement_Sequence
6509 Raise_Exception_Call
:= False;
6511 -- Get last real statement
6513 Last_Stm
:= Last
(L
);
6515 -- Deal with digging out exception handler statement sequences that
6516 -- have been transformed by the local raise to goto optimization.
6517 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
6518 -- optimization has occurred, we are looking at something like:
6521 -- original stmts in block
6525 -- goto L1; | omitted if No_Exception_Propagation
6530 -- goto L3; -- skip handler when exception not raised
6532 -- <<L1>> -- target label for local exception
6546 -- and what we have to do is to dig out the estmts1 and estmts2
6547 -- sequences (which were the original sequences of statements in
6548 -- the exception handlers) and check them.
6550 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
6555 exit when Nkind
(Stm
) /= N_Block_Statement
;
6556 exit when not Exception_Junk
(Stm
);
6559 exit when Nkind
(Stm
) /= N_Label
;
6560 exit when not Exception_Junk
(Stm
);
6561 Check_Statement_Sequence
6562 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
6567 exit when Nkind
(Stm
) /= N_Goto_Statement
;
6568 exit when not Exception_Junk
(Stm
);
6572 -- Don't count pragmas
6574 while Nkind
(Last_Stm
) = N_Pragma
6576 -- Don't count call to SS_Release (can happen after Raise_Exception)
6579 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
6581 Nkind
(Name
(Last_Stm
)) = N_Identifier
6583 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
6585 -- Don't count exception junk
6588 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
6590 N_Object_Declaration
)
6591 and then Exception_Junk
(Last_Stm
))
6592 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
6593 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
6595 -- Inserted code, such as finalization calls, is irrelevant: we only
6596 -- need to check original source.
6598 or else Is_Rewrite_Insertion
(Last_Stm
)
6603 -- Here we have the "real" last statement
6605 Kind
:= Nkind
(Last_Stm
);
6607 -- Transfer of control, OK. Note that in the No_Return procedure
6608 -- case, we already diagnosed any explicit return statements, so
6609 -- we can treat them as OK in this context.
6611 if Is_Transfer
(Last_Stm
) then
6614 -- Check cases of explicit non-indirect procedure calls
6616 elsif Kind
= N_Procedure_Call_Statement
6617 and then Is_Entity_Name
(Name
(Last_Stm
))
6619 -- Check call to Raise_Exception procedure which is treated
6620 -- specially, as is a call to Reraise_Occurrence.
6622 -- We suppress the warning in these cases since it is likely that
6623 -- the programmer really does not expect to deal with the case
6624 -- of Null_Occurrence, and thus would find a warning about a
6625 -- missing return curious, and raising Program_Error does not
6626 -- seem such a bad behavior if this does occur.
6628 -- Note that in the Ada 2005 case for Raise_Exception, the actual
6629 -- behavior will be to raise Constraint_Error (see AI-329).
6631 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
6633 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
6635 Raise_Exception_Call
:= True;
6637 -- For Raise_Exception call, test first argument, if it is
6638 -- an attribute reference for a 'Identity call, then we know
6639 -- that the call cannot possibly return.
6642 Arg
: constant Node_Id
:=
6643 Original_Node
(First_Actual
(Last_Stm
));
6645 if Nkind
(Arg
) = N_Attribute_Reference
6646 and then Attribute_Name
(Arg
) = Name_Identity
6653 -- If statement, need to look inside if there is an else and check
6654 -- each constituent statement sequence for proper termination.
6656 elsif Kind
= N_If_Statement
6657 and then Present
(Else_Statements
(Last_Stm
))
6659 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
6660 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6662 if Present
(Elsif_Parts
(Last_Stm
)) then
6664 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
6667 while Present
(Elsif_Part
) loop
6668 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
6676 -- Case statement, check each case for proper termination
6678 elsif Kind
= N_Case_Statement
then
6682 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6683 while Present
(Case_Alt
) loop
6684 Check_Statement_Sequence
(Statements
(Case_Alt
));
6685 Next_Non_Pragma
(Case_Alt
);
6691 -- Block statement, check its handled sequence of statements
6693 elsif Kind
= N_Block_Statement
then
6699 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6708 -- Loop statement. If there is an iteration scheme, we can definitely
6709 -- fall out of the loop. Similarly if there is an exit statement, we
6710 -- can fall out. In either case we need a following return.
6712 elsif Kind
= N_Loop_Statement
then
6713 if Present
(Iteration_Scheme
(Last_Stm
))
6714 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6718 -- A loop with no exit statement or iteration scheme is either
6719 -- an infinite loop, or it has some other exit (raise/return).
6720 -- In either case, no warning is required.
6726 -- Timed entry call, check entry call and delay alternatives
6728 -- Note: in expanded code, the timed entry call has been converted
6729 -- to a set of expanded statements on which the check will work
6730 -- correctly in any case.
6732 elsif Kind
= N_Timed_Entry_Call
then
6734 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6735 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6738 -- If statement sequence of entry call alternative is missing,
6739 -- then we can definitely fall through, and we post the error
6740 -- message on the entry call alternative itself.
6742 if No
(Statements
(ECA
)) then
6745 -- If statement sequence of delay alternative is missing, then
6746 -- we can definitely fall through, and we post the error
6747 -- message on the delay alternative itself.
6749 -- Note: if both ECA and DCA are missing the return, then we
6750 -- post only one message, should be enough to fix the bugs.
6751 -- If not we will get a message next time on the DCA when the
6754 elsif No
(Statements
(DCA
)) then
6757 -- Else check both statement sequences
6760 Check_Statement_Sequence
(Statements
(ECA
));
6761 Check_Statement_Sequence
(Statements
(DCA
));
6766 -- Conditional entry call, check entry call and else part
6768 -- Note: in expanded code, the conditional entry call has been
6769 -- converted to a set of expanded statements on which the check
6770 -- will work correctly in any case.
6772 elsif Kind
= N_Conditional_Entry_Call
then
6774 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6777 -- If statement sequence of entry call alternative is missing,
6778 -- then we can definitely fall through, and we post the error
6779 -- message on the entry call alternative itself.
6781 if No
(Statements
(ECA
)) then
6784 -- Else check statement sequence and else part
6787 Check_Statement_Sequence
(Statements
(ECA
));
6788 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6794 -- If we fall through, issue appropriate message
6798 -- Kill warning if last statement is a raise exception call,
6799 -- or a pragma Assert (False). Note that with assertions enabled,
6800 -- such a pragma has been converted into a raise exception call
6801 -- already, so the Assert_False is for the assertions off case.
6803 if not Raise_Exception_Call
and then not Assert_False
then
6805 -- In GNATprove mode, it is an error to have a missing return
6807 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6809 -- Issue error message or warning
6812 ("RETURN statement missing following this statement<<!",
6815 ("\Program_Error ]<<!", Last_Stm
);
6818 -- Note: we set Err even though we have not issued a warning
6819 -- because we still have a case of a missing return. This is
6820 -- an extremely marginal case, probably will never be noticed
6821 -- but we might as well get it right.
6825 -- Otherwise we have the case of a procedure marked No_Return
6828 if not Raise_Exception_Call
then
6829 if GNATprove_Mode
then
6831 ("implied return after this statement would have raised "
6832 & "Program_Error", Last_Stm
);
6834 -- In normal compilation mode, do not warn on a generated call
6835 -- (e.g. in the body of a renaming as completion).
6837 elsif Comes_From_Source
(Last_Stm
) then
6839 ("implied return after this statement will raise "
6840 & "Program_Error??", Last_Stm
);
6843 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6845 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6849 RE
: constant Node_Id
:=
6850 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6851 Reason
=> PE_Implicit_Return
);
6853 Insert_After
(Last_Stm
, RE
);
6857 end Check_Statement_Sequence
;
6859 -- Start of processing for Check_Returns
6863 Check_Statement_Sequence
(Statements
(HSS
));
6865 if Present
(Exception_Handlers
(HSS
)) then
6866 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6867 while Present
(Handler
) loop
6868 Check_Statement_Sequence
(Statements
(Handler
));
6869 Next_Non_Pragma
(Handler
);
6874 ----------------------------
6875 -- Check_Subprogram_Order --
6876 ----------------------------
6878 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6880 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6881 -- This is used to check if S1 > S2 in the sense required by this test,
6882 -- for example nameab < namec, but name2 < name10.
6884 -----------------------------
6885 -- Subprogram_Name_Greater --
6886 -----------------------------
6888 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6893 -- Deal with special case where names are identical except for a
6894 -- numerical suffix. These are handled specially, taking the numeric
6895 -- ordering from the suffix into account.
6898 while S1
(L1
) in '0' .. '9' loop
6903 while S2
(L2
) in '0' .. '9' loop
6907 -- If non-numeric parts non-equal, do straight compare
6909 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6912 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6913 -- that a missing suffix is treated as numeric zero in this test.
6917 while L1
< S1
'Last loop
6919 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6923 while L2
< S2
'Last loop
6925 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6930 end Subprogram_Name_Greater
;
6932 -- Start of processing for Check_Subprogram_Order
6935 -- Check body in alpha order if this is option
6938 and then Style_Check_Order_Subprograms
6939 and then Nkind
(N
) = N_Subprogram_Body
6940 and then Comes_From_Source
(N
)
6941 and then In_Extended_Main_Source_Unit
(N
)
6945 renames Scope_Stack
.Table
6946 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6948 Body_Id
: constant Entity_Id
:=
6949 Defining_Entity
(Specification
(N
));
6952 Get_Decoded_Name_String
(Chars
(Body_Id
));
6955 if Subprogram_Name_Greater
6956 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6958 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6964 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6967 end Check_Subprogram_Order;
6969 ------------------------------
6970 -- Check_Subtype_Conformant --
6971 ------------------------------
6973 procedure Check_Subtype_Conformant
6974 (New_Id : Entity_Id;
6976 Err_Loc : Node_Id := Empty;
6977 Skip_Controlling_Formals : Boolean := False;
6978 Get_Inst : Boolean := False)
6981 pragma Warnings (Off, Result);
6984 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6985 Skip_Controlling_Formals => Skip_Controlling_Formals,
6986 Get_Inst => Get_Inst);
6987 end Check_Subtype_Conformant;
6989 -----------------------------------
6990 -- Check_Synchronized_Overriding --
6991 -----------------------------------
6993 procedure Check_Synchronized_Overriding
6994 (Def_Id : Entity_Id;
6995 Overridden_Subp : out Entity_Id)
6997 Ifaces_List : Elist_Id;
7001 function Matches_Prefixed_View_Profile
7002 (Prim_Params : List_Id;
7003 Iface_Params : List_Id) return Boolean;
7004 -- Determine whether a subprogram's parameter profile Prim_Params
7005 -- matches that of a potentially overridden interface subprogram
7006 -- Iface_Params. Also determine if the type of first parameter of
7007 -- Iface_Params is an implemented interface.
7009 -----------------------------------
7010 -- Matches_Prefixed_View_Profile --
7011 -----------------------------------
7013 function Matches_Prefixed_View_Profile
7014 (Prim_Params : List_Id;
7015 Iface_Params : List_Id) return Boolean
7017 function Is_Implemented
7018 (Ifaces_List : Elist_Id;
7019 Iface : Entity_Id) return Boolean;
7020 -- Determine if Iface is implemented by the current task or
7023 --------------------
7024 -- Is_Implemented --
7025 --------------------
7027 function Is_Implemented
7028 (Ifaces_List : Elist_Id;
7029 Iface : Entity_Id) return Boolean
7031 Iface_Elmt : Elmt_Id;
7034 Iface_Elmt := First_Elmt (Ifaces_List);
7035 while Present (Iface_Elmt) loop
7036 if Node (Iface_Elmt) = Iface then
7040 Next_Elmt (Iface_Elmt);
7048 Iface_Id : Entity_Id;
7049 Iface_Param : Node_Id;
7050 Iface_Typ : Entity_Id;
7051 Prim_Id : Entity_Id;
7052 Prim_Param : Node_Id;
7053 Prim_Typ : Entity_Id;
7055 -- Start of processing for Matches_Prefixed_View_Profile
7058 Iface_Param := First (Iface_Params);
7059 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
7061 if Is_Access_Type (Iface_Typ) then
7062 Iface_Typ := Designated_Type (Iface_Typ);
7065 Prim_Param := First (Prim_Params);
7067 -- The first parameter of the potentially overridden subprogram must
7068 -- be an interface implemented by Prim.
7070 if not Is_Interface (Iface_Typ)
7071 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7076 -- The checks on the object parameters are done, so move on to the
7077 -- rest of the parameters.
7079 if not In_Scope then
7080 Prim_Param := Next (Prim_Param);
7083 Iface_Param := Next (Iface_Param);
7084 while Present (Iface_Param) and then Present (Prim_Param) loop
7085 Iface_Id := Defining_Identifier (Iface_Param);
7086 Iface_Typ := Find_Parameter_Type (Iface_Param);
7088 Prim_Id := Defining_Identifier (Prim_Param);
7089 Prim_Typ := Find_Parameter_Type (Prim_Param);
7091 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7092 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7093 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7095 Iface_Typ := Designated_Type (Iface_Typ);
7096 Prim_Typ := Designated_Type (Prim_Typ);
7099 -- Case of multiple interface types inside a parameter profile
7101 -- (Obj_Param : in out Iface; ...; Param : Iface)
7103 -- If the interface type is implemented, then the matching type in
7104 -- the primitive should be the implementing record type.
7106 if Ekind (Iface_Typ) = E_Record_Type
7107 and then Is_Interface (Iface_Typ)
7108 and then Is_Implemented (Ifaces_List, Iface_Typ)
7110 if Prim_Typ /= Typ then
7114 -- The two parameters must be both mode and subtype conformant
7116 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7118 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7127 -- One of the two lists contains more parameters than the other
7129 if Present (Iface_Param) or else Present (Prim_Param) then
7134 end Matches_Prefixed_View_Profile;
7136 -- Start of processing for Check_Synchronized_Overriding
7139 Overridden_Subp := Empty;
7141 -- Def_Id must be an entry or a subprogram. We should skip predefined
7142 -- primitives internally generated by the front end; however at this
7143 -- stage predefined primitives are still not fully decorated. As a
7144 -- minor optimization we skip here internally generated subprograms.
7146 if (Ekind (Def_Id) /= E_Entry
7147 and then Ekind (Def_Id) /= E_Function
7148 and then Ekind (Def_Id) /= E_Procedure)
7149 or else not Comes_From_Source (Def_Id)
7154 -- Search for the concurrent declaration since it contains the list of
7155 -- all implemented interfaces. In this case, the subprogram is declared
7156 -- within the scope of a protected or a task type.
7158 if Present (Scope (Def_Id))
7159 and then Is_Concurrent_Type (Scope (Def_Id))
7160 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7162 Typ := Scope (Def_Id);
7165 -- The enclosing scope is not a synchronized type and the subprogram
7168 elsif No (First_Formal (Def_Id)) then
7171 -- The subprogram has formals and hence it may be a primitive of a
7175 Typ := Etype (First_Formal (Def_Id));
7177 if Is_Access_Type (Typ) then
7178 Typ := Directly_Designated_Type (Typ);
7181 if Is_Concurrent_Type (Typ)
7182 and then not Is_Generic_Actual_Type (Typ)
7186 -- This case occurs when the concurrent type is declared within a
7187 -- generic unit. As a result the corresponding record has been built
7188 -- and used as the type of the first formal, we just have to retrieve
7189 -- the corresponding concurrent type.
7191 elsif Is_Concurrent_Record_Type (Typ)
7192 and then not Is_Class_Wide_Type (Typ)
7193 and then Present (Corresponding_Concurrent_Type (Typ))
7195 Typ := Corresponding_Concurrent_Type (Typ);
7203 -- There is no overriding to check if this is an inherited operation in
7204 -- a type derivation for a generic actual.
7206 Collect_Interfaces (Typ, Ifaces_List);
7208 if Is_Empty_Elmt_List (Ifaces_List) then
7212 -- Determine whether entry or subprogram Def_Id overrides a primitive
7213 -- operation that belongs to one of the interfaces in Ifaces_List.
7216 Candidate : Entity_Id := Empty;
7217 Hom : Entity_Id := Empty;
7218 Subp : Entity_Id := Empty;
7221 -- Traverse the homonym chain, looking for a potentially overridden
7222 -- subprogram that belongs to an implemented interface.
7224 Hom := Current_Entity_In_Scope (Def_Id);
7225 while Present (Hom) loop
7229 or else not Is_Overloadable (Subp)
7230 or else not Is_Primitive (Subp)
7231 or else not Is_Dispatching_Operation (Subp)
7232 or else not Present (Find_Dispatching_Type (Subp))
7233 or else not Is_Interface (Find_Dispatching_Type (Subp))
7237 -- Entries and procedures can override abstract or null interface
7240 elsif Ekind_In (Def_Id, E_Entry, E_Procedure)
7241 and then Ekind (Subp) = E_Procedure
7242 and then Matches_Prefixed_View_Profile
7243 (Parameter_Specifications (Parent (Def_Id)),
7244 Parameter_Specifications (Parent (Subp)))
7248 -- For an overridden subprogram Subp, check whether the mode
7249 -- of its first parameter is correct depending on the kind of
7250 -- synchronized type.
7253 Formal : constant Node_Id := First_Formal (Candidate);
7256 -- In order for an entry or a protected procedure to
7257 -- override, the first parameter of the overridden routine
7258 -- must be of mode "out", "in out", or access-to-variable.
7260 if Ekind_In (Candidate, E_Entry, E_Procedure)
7261 and then Is_Protected_Type (Typ)
7262 and then Ekind (Formal) /= E_In_Out_Parameter
7263 and then Ekind (Formal) /= E_Out_Parameter
7264 and then Nkind (Parameter_Type (Parent (Formal))) /=
7269 -- All other cases are OK since a task entry or routine does
7270 -- not have a restriction on the mode of the first parameter
7271 -- of the overridden interface routine.
7274 Overridden_Subp := Candidate;
7279 -- Functions can override abstract interface functions
7281 elsif Ekind (Def_Id) = E_Function
7282 and then Ekind (Subp) = E_Function
7283 and then Matches_Prefixed_View_Profile
7284 (Parameter_Specifications (Parent (Def_Id)),
7285 Parameter_Specifications (Parent (Subp)))
7286 and then Etype (Def_Id) = Etype (Subp)
7290 -- If an inherited subprogram is implemented by a protected
7291 -- function, then the first parameter of the inherited
7292 -- subprogram shall be of mode in, but not an access-to-
7293 -- variable parameter (RM 9.4(11/9)).
7295 if Present (First_Formal (Subp))
7296 and then Ekind (First_Formal (Subp)) = E_In_Parameter
7298 (not Is_Access_Type (Etype (First_Formal (Subp)))
7300 Is_Access_Constant (Etype (First_Formal (Subp))))
7302 Overridden_Subp := Subp;
7307 Hom := Homonym (Hom);
7310 -- After examining all candidates for overriding, we are left with
7311 -- the best match, which is a mode-incompatible interface routine.
7313 if In_Scope and then Present (Candidate) then
7314 Error_Msg_PT (Def_Id, Candidate);
7317 Overridden_Subp := Candidate;
7320 end Check_Synchronized_Overriding;
7322 ---------------------------
7323 -- Check_Type_Conformant --
7324 ---------------------------
7326 procedure Check_Type_Conformant
7327 (New_Id : Entity_Id;
7329 Err_Loc : Node_Id := Empty)
7332 pragma Warnings (Off, Result);
7335 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
7336 end Check_Type_Conformant;
7338 ---------------------------
7339 -- Can_Override_Operator --
7340 ---------------------------
7342 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
7346 if Nkind (Subp) /= N_Defining_Operator_Symbol then
7350 Typ := Base_Type (Etype (First_Formal (Subp)));
7352 -- Check explicitly that the operation is a primitive of the type
7354 return Operator_Matches_Spec (Subp, Subp)
7355 and then not Is_Generic_Type (Typ)
7356 and then Scope (Subp) = Scope (Typ)
7357 and then not Is_Class_Wide_Type (Typ);
7359 end Can_Override_Operator;
7361 ----------------------
7362 -- Conforming_Types --
7363 ----------------------
7365 function Conforming_Types
7368 Ctype : Conformance_Type;
7369 Get_Inst : Boolean := False) return Boolean
7371 function Base_Types_Match
7373 Typ_2 : Entity_Id) return Boolean;
7374 -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are
7375 -- in different scopes (e.g. parent and child instances), then verify
7376 -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on
7377 -- the same subtype chain. The whole purpose of this procedure is to
7378 -- prevent spurious ambiguities in an instantiation that may arise if
7379 -- two distinct generic types are instantiated with the same actual.
7381 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id;
7382 -- An access parameter can designate an incomplete type. If the
7383 -- incomplete type is the limited view of a type from a limited_
7384 -- with_clause, check whether the non-limited view is available.
7385 -- If it is a (non-limited) incomplete type, get the full view.
7387 function Matches_Limited_With_View
7389 Typ_2 : Entity_Id) return Boolean;
7390 -- Returns True if and only if either Typ_1 denotes a limited view of
7391 -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when
7392 -- the limited with view of a type is used in a subprogram declaration
7393 -- and the subprogram body is in the scope of a regular with clause for
7394 -- the same unit. In such a case, the two type entities are considered
7395 -- identical for purposes of conformance checking.
7397 ----------------------
7398 -- Base_Types_Match --
7399 ----------------------
7401 function Base_Types_Match
7403 Typ_2 : Entity_Id) return Boolean
7405 Base_1 : constant Entity_Id := Base_Type (Typ_1);
7406 Base_2 : constant Entity_Id := Base_Type (Typ_2);
7409 if Typ_1 = Typ_2 then
7412 elsif Base_1 = Base_2 then
7414 -- The following is too permissive. A more precise test should
7415 -- check that the generic actual is an ancestor subtype of the
7418 -- See code in Find_Corresponding_Spec that applies an additional
7419 -- filter to handle accidental amiguities in instances.
7422 not Is_Generic_Actual_Type (Typ_1)
7423 or else not Is_Generic_Actual_Type (Typ_2)
7424 or else Scope (Typ_1) /= Scope (Typ_2);
7426 -- If Typ_2 is a generic actual type it is declared as the subtype of
7427 -- the actual. If that actual is itself a subtype we need to use its
7428 -- own base type to check for compatibility.
7430 elsif Ekind (Base_2) = Ekind (Typ_2)
7431 and then Base_1 = Base_Type (Base_2)
7435 elsif Ekind (Base_1) = Ekind (Typ_1)
7436 and then Base_2 = Base_Type (Base_1)
7443 end Base_Types_Match;
7445 --------------------------
7446 -- Find_Designated_Type --
7447 --------------------------
7449 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is
7453 Desig := Directly_Designated_Type (Typ);
7455 if Ekind (Desig) = E_Incomplete_Type then
7457 -- If regular incomplete type, get full view if available
7459 if Present (Full_View (Desig)) then
7460 Desig := Full_View (Desig);
7462 -- If limited view of a type, get non-limited view if available,
7463 -- and check again for a regular incomplete type.
7465 elsif Present (Non_Limited_View (Desig)) then
7466 Desig := Get_Full_View (Non_Limited_View (Desig));
7471 end Find_Designated_Type;
7473 -------------------------------
7474 -- Matches_Limited_With_View --
7475 -------------------------------
7477 function Matches_Limited_With_View
7479 Typ_2 : Entity_Id) return Boolean
7481 function Is_Matching_Limited_View
7483 View : Entity_Id) return Boolean;
7484 -- Determine whether non-limited view View denotes type Typ in some
7485 -- conformant fashion.
7487 ------------------------------
7488 -- Is_Matching_Limited_View --
7489 ------------------------------
7491 function Is_Matching_Limited_View
7493 View : Entity_Id) return Boolean
7495 Root_Typ : Entity_Id;
7496 Root_View : Entity_Id;
7499 -- The non-limited view directly denotes the type
7504 -- The type is a subtype of the non-limited view
7506 elsif Is_Subtype_Of (Typ, View) then
7509 -- Both the non-limited view and the type denote class-wide types
7511 elsif Is_Class_Wide_Type (Typ)
7512 and then Is_Class_Wide_Type (View)
7514 Root_Typ := Root_Type (Typ);
7515 Root_View := Root_Type (View);
7517 if Root_Typ = Root_View then
7520 -- An incomplete tagged type and its full view may receive two
7521 -- distinct class-wide types when the related package has not
7522 -- been analyzed yet.
7525 -- type T is tagged; -- CW_1
7526 -- type T is tagged null record; -- CW_2
7529 -- This is because the package lacks any semantic information
7530 -- that may eventually link both views of T. As a consequence,
7531 -- a client of the limited view of Pack will see CW_2 while a
7532 -- client of the non-limited view of Pack will see CW_1.
7534 elsif Is_Incomplete_Type (Root_Typ)
7535 and then Present (Full_View (Root_Typ))
7536 and then Full_View (Root_Typ) = Root_View
7540 elsif Is_Incomplete_Type (Root_View)
7541 and then Present (Full_View (Root_View))
7542 and then Full_View (Root_View) = Root_Typ
7549 end Is_Matching_Limited_View;
7551 -- Start of processing for Matches_Limited_With_View
7554 -- In some cases a type imported through a limited_with clause, and
7555 -- its non-limited view are both visible, for example in an anonymous
7556 -- access-to-class-wide type in a formal, or when building the body
7557 -- for a subprogram renaming after the subprogram has been frozen.
7558 -- In these cases both entities designate the same type. In addition,
7559 -- if one of them is an actual in an instance, it may be a subtype of
7560 -- the non-limited view of the other.
7562 if From_Limited_With (Typ_1)
7563 and then From_Limited_With (Typ_2)
7564 and then Available_View (Typ_1) = Available_View (Typ_2)
7568 elsif From_Limited_With (Typ_1) then
7569 return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1));
7571 elsif From_Limited_With (Typ_2) then
7572 return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2));
7577 end Matches_Limited_With_View;
7581 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
7583 Type_1 : Entity_Id := T1;
7584 Type_2 : Entity_Id := T2;
7586 -- Start of processing for Conforming_Types
7589 -- The context is an instance association for a formal access-to-
7590 -- subprogram type; the formal parameter types require mapping because
7591 -- they may denote other formal parameters of the generic unit.
7594 Type_1 := Get_Instance_Of (T1);
7595 Type_2 := Get_Instance_Of (T2);
7598 -- If one of the types is a view of the other introduced by a limited
7599 -- with clause, treat these as conforming for all purposes.
7601 if Matches_Limited_With_View (T1, T2) then
7604 elsif Base_Types_Match (Type_1, Type_2) then
7605 if Ctype <= Mode_Conformant then
7610 Subtypes_Statically_Match (Type_1, Type_2)
7611 and then Dimensions_Match (Type_1, Type_2);
7614 elsif Is_Incomplete_Or_Private_Type (Type_1)
7615 and then Present (Full_View (Type_1))
7616 and then Base_Types_Match (Full_View (Type_1), Type_2)
7619 Ctype <= Mode_Conformant
7620 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
7622 elsif Ekind (Type_2) = E_Incomplete_Type
7623 and then Present (Full_View (Type_2))
7624 and then Base_Types_Match (Type_1, Full_View (Type_2))
7627 Ctype <= Mode_Conformant
7628 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7630 elsif Is_Private_Type (Type_2)
7631 and then In_Instance
7632 and then Present (Full_View (Type_2))
7633 and then Base_Types_Match (Type_1, Full_View (Type_2))
7636 Ctype <= Mode_Conformant
7637 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7639 -- Another confusion between views in a nested instance with an
7640 -- actual private type whose full view is not in scope.
7642 elsif Ekind (Type_2) = E_Private_Subtype
7643 and then In_Instance
7644 and then Etype (Type_2) = Type_1
7648 -- In Ada 2012, incomplete types (including limited views) can appear
7649 -- as actuals in instantiations.
7651 elsif Is_Incomplete_Type (Type_1)
7652 and then Is_Incomplete_Type (Type_2)
7653 and then (Used_As_Generic_Actual (Type_1)
7654 or else Used_As_Generic_Actual (Type_2))
7659 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
7660 -- treated recursively because they carry a signature. As far as
7661 -- conformance is concerned, convention plays no role, and either
7662 -- or both could be access to protected subprograms.
7664 Are_Anonymous_Access_To_Subprogram_Types :=
7665 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
7666 E_Anonymous_Access_Protected_Subprogram_Type)
7668 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
7669 E_Anonymous_Access_Protected_Subprogram_Type);
7671 -- Test anonymous access type case. For this case, static subtype
7672 -- matching is required for mode conformance (RM 6.3.1(15)). We check
7673 -- the base types because we may have built internal subtype entities
7674 -- to handle null-excluding types (see Process_Formals).
7676 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
7678 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
7680 -- Ada 2005 (AI-254)
7682 or else Are_Anonymous_Access_To_Subprogram_Types
7685 Desig_1 : Entity_Id;
7686 Desig_2 : Entity_Id;
7689 -- In Ada 2005, access constant indicators must match for
7690 -- subtype conformance.
7692 if Ada_Version >= Ada_2005
7693 and then Ctype >= Subtype_Conformant
7695 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
7700 Desig_1 := Find_Designated_Type (Type_1);
7701 Desig_2 := Find_Designated_Type (Type_2);
7703 -- If the context is an instance association for a formal
7704 -- access-to-subprogram type; formal access parameter designated
7705 -- types require mapping because they may denote other formal
7706 -- parameters of the generic unit.
7709 Desig_1 := Get_Instance_Of (Desig_1);
7710 Desig_2 := Get_Instance_Of (Desig_2);
7713 -- It is possible for a Class_Wide_Type to be introduced for an
7714 -- incomplete type, in which case there is a separate class_ wide
7715 -- type for the full view. The types conform if their Etypes
7716 -- conform, i.e. one may be the full view of the other. This can
7717 -- only happen in the context of an access parameter, other uses
7718 -- of an incomplete Class_Wide_Type are illegal.
7720 if Is_Class_Wide_Type (Desig_1)
7722 Is_Class_Wide_Type (Desig_2)
7726 (Etype (Base_Type (Desig_1)),
7727 Etype (Base_Type (Desig_2)), Ctype);
7729 elsif Are_Anonymous_Access_To_Subprogram_Types then
7730 if Ada_Version < Ada_2005 then
7732 Ctype = Type_Conformant
7733 or else Subtypes_Statically_Match (Desig_1, Desig_2);
7735 -- We must check the conformance of the signatures themselves
7739 Conformant : Boolean;
7742 (Desig_1, Desig_2, Ctype, False, Conformant);
7747 -- A limited view of an actual matches the corresponding
7748 -- incomplete formal.
7750 elsif Ekind (Desig_2) = E_Incomplete_Subtype
7751 and then From_Limited_With (Desig_2)
7752 and then Used_As_Generic_Actual (Etype (Desig_2))
7757 return Base_Type (Desig_1) = Base_Type (Desig_2)
7758 and then (Ctype = Type_Conformant
7760 Subtypes_Statically_Match (Desig_1, Desig_2));
7764 -- Otherwise definitely no match
7767 if ((Ekind (Type_1) = E_Anonymous_Access_Type
7768 and then Is_Access_Type (Type_2))
7769 or else (Ekind (Type_2) = E_Anonymous_Access_Type
7770 and then Is_Access_Type (Type_1)))
7773 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
7775 May_Hide_Profile := True;
7780 end Conforming_Types;
7782 --------------------------
7783 -- Create_Extra_Formals --
7784 --------------------------
7786 procedure Create_Extra_Formals (E : Entity_Id) is
7787 First_Extra : Entity_Id := Empty;
7789 Last_Extra : Entity_Id := Empty;
7791 function Add_Extra_Formal
7792 (Assoc_Entity : Entity_Id;
7795 Suffix : String) return Entity_Id;
7796 -- Add an extra formal to the current list of formals and extra formals.
7797 -- The extra formal is added to the end of the list of extra formals,
7798 -- and also returned as the result. These formals are always of mode IN.
7799 -- The new formal has the type Typ, is declared in Scope, and its name
7800 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
7801 -- The following suffixes are currently used. They should not be changed
7802 -- without coordinating with CodePeer, which makes use of these to
7803 -- provide better messages.
7805 -- O denotes the Constrained bit.
7806 -- L denotes the accessibility level.
7807 -- BIP_xxx denotes an extra formal for a build-in-place function. See
7808 -- the full list in exp_ch6.BIP_Formal_Kind.
7810 ----------------------
7811 -- Add_Extra_Formal --
7812 ----------------------
7814 function Add_Extra_Formal
7815 (Assoc_Entity : Entity_Id;
7818 Suffix : String) return Entity_Id
7820 EF : constant Entity_Id :=
7821 Make_Defining_Identifier (Sloc (Assoc_Entity),
7822 Chars => New_External_Name (Chars (Assoc_Entity),
7826 -- A little optimization. Never generate an extra formal for the
7827 -- _init operand of an initialization procedure, since it could
7830 if Chars (Formal) = Name_uInit then
7834 Set_Ekind (EF, E_In_Parameter);
7835 Set_Actual_Subtype (EF, Typ);
7836 Set_Etype (EF, Typ);
7837 Set_Scope (EF, Scope);
7838 Set_Mechanism (EF, Default_Mechanism);
7839 Set_Formal_Validity (EF);
7841 if No (First_Extra) then
7843 Set_Extra_Formals (Scope, First_Extra);
7846 if Present (Last_Extra) then
7847 Set_Extra_Formal (Last_Extra, EF);
7853 end Add_Extra_Formal;
7857 Formal_Type : Entity_Id;
7858 P_Formal : Entity_Id := Empty;
7860 -- Start of processing for Create_Extra_Formals
7863 -- We never generate extra formals if expansion is not active because we
7864 -- don't need them unless we are generating code.
7866 if not Expander_Active then
7870 -- No need to generate extra formals in interface thunks whose target
7871 -- primitive has no extra formals.
7873 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
7877 -- If this is a derived subprogram then the subtypes of the parent
7878 -- subprogram's formal parameters will be used to determine the need
7879 -- for extra formals.
7881 if Is_Overloadable (E) and then Present (Alias (E)) then
7882 P_Formal := First_Formal (Alias (E));
7885 Formal := First_Formal (E);
7886 while Present (Formal) loop
7887 Last_Extra := Formal;
7888 Next_Formal (Formal);
7891 -- If Extra_Formals were already created, don't do it again. This
7892 -- situation may arise for subprogram types created as part of
7893 -- dispatching calls (see Expand_Dispatching_Call)
7895 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
7899 -- If the subprogram is a predefined dispatching subprogram then don't
7900 -- generate any extra constrained or accessibility level formals. In
7901 -- general we suppress these for internal subprograms (by not calling
7902 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
7903 -- generated stream attributes do get passed through because extra
7904 -- build-in-place formals are needed in some cases (limited 'Input
).
7906 if Is_Predefined_Internal_Operation
(E
) then
7907 goto Test_For_Func_Result_Extras
;
7910 Formal
:= First_Formal
(E
);
7911 while Present
(Formal
) loop
7913 -- Create extra formal for supporting the attribute 'Constrained.
7914 -- The case of a private type view without discriminants also
7915 -- requires the extra formal if the underlying type has defaulted
7918 if Ekind
(Formal
) /= E_In_Parameter
then
7919 if Present
(P_Formal
) then
7920 Formal_Type
:= Etype
(P_Formal
);
7922 Formal_Type
:= Etype
(Formal
);
7925 -- Do not produce extra formals for Unchecked_Union parameters.
7926 -- Jump directly to the end of the loop.
7928 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
7929 goto Skip_Extra_Formal_Generation
;
7932 if not Has_Discriminants
(Formal_Type
)
7933 and then Ekind
(Formal_Type
) in Private_Kind
7934 and then Present
(Underlying_Type
(Formal_Type
))
7936 Formal_Type
:= Underlying_Type
(Formal_Type
);
7939 -- Suppress the extra formal if formal's subtype is constrained or
7940 -- indefinite, or we're compiling for Ada 2012 and the underlying
7941 -- type is tagged and limited. In Ada 2012, a limited tagged type
7942 -- can have defaulted discriminants, but 'Constrained is required
7943 -- to return True, so the formal is never needed (see AI05-0214).
7944 -- Note that this ensures consistency of calling sequences for
7945 -- dispatching operations when some types in a class have defaults
7946 -- on discriminants and others do not (and requiring the extra
7947 -- formal would introduce distributed overhead).
7949 -- If the type does not have a completion yet, treat as prior to
7950 -- Ada 2012 for consistency.
7952 if Has_Discriminants
(Formal_Type
)
7953 and then not Is_Constrained
(Formal_Type
)
7954 and then Is_Definite_Subtype
(Formal_Type
)
7955 and then (Ada_Version
< Ada_2012
7956 or else No
(Underlying_Type
(Formal_Type
))
7958 (Is_Limited_Type
(Formal_Type
)
7961 (Underlying_Type
(Formal_Type
)))))
7963 Set_Extra_Constrained
7964 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
7968 -- Create extra formal for supporting accessibility checking. This
7969 -- is done for both anonymous access formals and formals of named
7970 -- access types that are marked as controlling formals. The latter
7971 -- case can occur when Expand_Dispatching_Call creates a subprogram
7972 -- type and substitutes the types of access-to-class-wide actuals
7973 -- for the anonymous access-to-specific-type of controlling formals.
7974 -- Base_Type is applied because in cases where there is a null
7975 -- exclusion the formal may have an access subtype.
7977 -- This is suppressed if we specifically suppress accessibility
7978 -- checks at the package level for either the subprogram, or the
7979 -- package in which it resides. However, we do not suppress it
7980 -- simply if the scope has accessibility checks suppressed, since
7981 -- this could cause trouble when clients are compiled with a
7982 -- different suppression setting. The explicit checks at the
7983 -- package level are safe from this point of view.
7985 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
7986 or else (Is_Controlling_Formal
(Formal
)
7987 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
7989 (Explicit_Suppress
(E
, Accessibility_Check
)
7991 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
7994 or else Present
(Extra_Accessibility
(P_Formal
)))
7996 Set_Extra_Accessibility
7997 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
8000 -- This label is required when skipping extra formal generation for
8001 -- Unchecked_Union parameters.
8003 <<Skip_Extra_Formal_Generation
>>
8005 if Present
(P_Formal
) then
8006 Next_Formal
(P_Formal
);
8009 Next_Formal
(Formal
);
8012 <<Test_For_Func_Result_Extras
>>
8014 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
8015 -- function call is ... determined by the point of call ...".
8017 if Needs_Result_Accessibility_Level
(E
) then
8018 Set_Extra_Accessibility_Of_Result
8019 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
8022 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
8023 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
8025 if Is_Build_In_Place_Function
(E
) then
8027 Result_Subt
: constant Entity_Id
:= Etype
(E
);
8028 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
8029 Formal_Typ
: Entity_Id
;
8030 Subp_Decl
: Node_Id
;
8032 Discard
: Entity_Id
;
8033 pragma Warnings
(Off
, Discard
);
8036 -- In the case of functions with unconstrained result subtypes,
8037 -- add a 4-state formal indicating whether the return object is
8038 -- allocated by the caller (1), or should be allocated by the
8039 -- callee on the secondary stack (2), in the global heap (3), or
8040 -- in a user-defined storage pool (4). For the moment we just use
8041 -- Natural for the type of this formal. Note that this formal
8042 -- isn't usually needed in the case where the result subtype is
8043 -- constrained, but it is needed when the function has a tagged
8044 -- result, because generally such functions can be called in a
8045 -- dispatching context and such calls must be handled like calls
8046 -- to a class-wide function.
8048 if Needs_BIP_Alloc_Form
(E
) then
8051 (E
, Standard_Natural
,
8052 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
8054 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
8055 -- use a user-defined pool. This formal is not added on
8056 -- ZFP as those targets do not support pools.
8058 if RTE_Available
(RE_Root_Storage_Pool_Ptr
) then
8061 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
8062 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
8066 -- In the case of functions whose result type needs finalization,
8067 -- add an extra formal which represents the finalization master.
8069 if Needs_BIP_Finalization_Master
(E
) then
8072 (E
, RTE
(RE_Finalization_Master_Ptr
),
8073 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
8076 -- When the result type contains tasks, add two extra formals: the
8077 -- master of the tasks to be created, and the caller's activation
8080 if Has_Task
(Full_Subt
) then
8083 (E
, RTE
(RE_Master_Id
),
8084 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
8087 (E
, RTE
(RE_Activation_Chain_Access
),
8088 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
8091 -- All build-in-place functions get an extra formal that will be
8092 -- passed the address of the return object within the caller.
8095 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
8097 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
8098 Set_Etype
(Formal_Typ
, Formal_Typ
);
8099 Set_Depends_On_Private
8100 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
8101 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
8102 Set_Is_Access_Constant
(Formal_Typ
, False);
8104 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
8105 -- the designated type comes from the limited view (for back-end
8108 Set_From_Limited_With
8109 (Formal_Typ
, From_Limited_With
(Result_Subt
));
8111 Layout_Type
(Formal_Typ
);
8113 -- Force the definition of the Itype in case of internal function
8114 -- calls within the same or nested scope.
8116 if Is_Subprogram_Or_Generic_Subprogram
(E
) then
8117 Subp_Decl
:= Parent
(E
);
8119 -- The insertion point for an Itype reference should be after
8120 -- the unit declaration node of the subprogram. An exception
8121 -- to this are inherited operations from a parent type in which
8122 -- case the derived type acts as their parent.
8124 if Nkind_In
(Subp_Decl
, N_Function_Specification
,
8125 N_Procedure_Specification
)
8127 Subp_Decl
:= Parent
(Subp_Decl
);
8130 Build_Itype_Reference
(Formal_Typ
, Subp_Decl
);
8135 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
8138 end Create_Extra_Formals
;
8140 -----------------------------
8141 -- Enter_Overloaded_Entity --
8142 -----------------------------
8144 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
8145 function Matches_Predefined_Op
return Boolean;
8146 -- This returns an approximation of whether S matches a predefined
8147 -- operator, based on the operator symbol, and the parameter and result
8148 -- types. The rules are scattered throughout chapter 4 of the Ada RM.
8150 ---------------------------
8151 -- Matches_Predefined_Op --
8152 ---------------------------
8154 function Matches_Predefined_Op
return Boolean is
8155 Formal_1
: constant Entity_Id
:= First_Formal
(S
);
8156 Formal_2
: constant Entity_Id
:= Next_Formal
(Formal_1
);
8157 Op
: constant Name_Id
:= Chars
(S
);
8158 Result_Type
: constant Entity_Id
:= Base_Type
(Etype
(S
));
8159 Type_1
: constant Entity_Id
:= Base_Type
(Etype
(Formal_1
));
8164 if Present
(Formal_2
) then
8166 Type_2
: constant Entity_Id
:= Base_Type
(Etype
(Formal_2
));
8169 -- All but "&" and "**" have same-types parameters
8178 if Type_1
/= Type_2
then
8183 -- Check parameter and result types
8191 Is_Boolean_Type
(Result_Type
)
8192 and then Result_Type
= Type_1
;
8198 Is_Integer_Type
(Result_Type
)
8199 and then Result_Type
= Type_1
;
8207 Is_Numeric_Type
(Result_Type
)
8208 and then Result_Type
= Type_1
;
8214 Is_Boolean_Type
(Result_Type
)
8215 and then not Is_Limited_Type
(Type_1
);
8223 Is_Boolean_Type
(Result_Type
)
8224 and then (Is_Array_Type
(Type_1
)
8225 or else Is_Scalar_Type
(Type_1
));
8227 when Name_Op_Concat
=>
8228 return Is_Array_Type
(Result_Type
);
8230 when Name_Op_Expon
=>
8232 (Is_Integer_Type
(Result_Type
)
8233 or else Is_Floating_Point_Type
(Result_Type
))
8234 and then Result_Type
= Type_1
8235 and then Type_2
= Standard_Integer
;
8238 raise Program_Error
;
8251 Is_Numeric_Type
(Result_Type
)
8252 and then Result_Type
= Type_1
;
8256 Is_Boolean_Type
(Result_Type
)
8257 and then Result_Type
= Type_1
;
8260 raise Program_Error
;
8263 end Matches_Predefined_Op
;
8267 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
8268 C_E
: Entity_Id
:= Current_Entity
(S
);
8270 -- Start of processing for Enter_Overloaded_Entity
8274 Set_Has_Homonym
(E
);
8275 Set_Has_Homonym
(S
);
8278 Set_Is_Immediately_Visible
(S
);
8279 Set_Scope
(S
, Current_Scope
);
8281 -- Chain new entity if front of homonym in current scope, so that
8282 -- homonyms are contiguous.
8284 if Present
(E
) and then E
/= C_E
then
8285 while Homonym
(C_E
) /= E
loop
8286 C_E
:= Homonym
(C_E
);
8289 Set_Homonym
(C_E
, S
);
8293 Set_Current_Entity
(S
);
8298 if Is_Inherited_Operation
(S
) then
8299 Append_Inherited_Subprogram
(S
);
8301 Append_Entity
(S
, Current_Scope
);
8304 Set_Public_Status
(S
);
8306 if Debug_Flag_E
then
8307 Write_Str
("New overloaded entity chain: ");
8308 Write_Name
(Chars
(S
));
8311 while Present
(E
) loop
8312 Write_Str
(" "); Write_Int
(Int
(E
));
8319 -- Generate warning for hiding
8322 and then Comes_From_Source
(S
)
8323 and then In_Extended_Main_Source_Unit
(S
)
8330 -- Warn unless genuine overloading. Do not emit warning on
8331 -- hiding predefined operators in Standard (these are either an
8332 -- (artifact of our implicit declarations, or simple noise) but
8333 -- keep warning on a operator defined on a local subtype, because
8334 -- of the real danger that different operators may be applied in
8335 -- various parts of the program.
8337 -- Note that if E and S have the same scope, there is never any
8338 -- hiding. Either the two conflict, and the program is illegal,
8339 -- or S is overriding an implicit inherited subprogram.
8341 if Scope
(E
) /= Scope
(S
)
8342 and then (not Is_Overloadable
(E
)
8343 or else Subtype_Conformant
(E
, S
))
8344 and then (Is_Immediately_Visible
(E
)
8345 or else Is_Potentially_Use_Visible
(S
))
8347 if Scope
(E
) = Standard_Standard
then
8348 if Nkind
(S
) = N_Defining_Operator_Symbol
8349 and then Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /=
8351 and then Matches_Predefined_Op
8354 ("declaration of & hides predefined operator?h?", S
);
8357 -- E not immediately within Standard
8360 Error_Msg_Sloc
:= Sloc
(E
);
8361 Error_Msg_N
("declaration of & hides one #?h?", S
);
8366 end Enter_Overloaded_Entity
;
8368 -----------------------------
8369 -- Check_Untagged_Equality --
8370 -----------------------------
8372 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
8373 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
8374 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
8378 -- This check applies only if we have a subprogram declaration with an
8379 -- untagged record type.
8381 if Nkind
(Decl
) /= N_Subprogram_Declaration
8382 or else not Is_Record_Type
(Typ
)
8383 or else Is_Tagged_Type
(Typ
)
8388 -- In Ada 2012 case, we will output errors or warnings depending on
8389 -- the setting of debug flag -gnatd.E.
8391 if Ada_Version
>= Ada_2012
then
8392 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
8394 -- In earlier versions of Ada, nothing to do unless we are warning on
8395 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
8398 if not Warn_On_Ada_2012_Compatibility
then
8403 -- Cases where the type has already been frozen
8405 if Is_Frozen
(Typ
) then
8407 -- If the type is not declared in a package, or if we are in the body
8408 -- of the package or in some other scope, the new operation is not
8409 -- primitive, and therefore legal, though suspicious. Should we
8410 -- generate a warning in this case ???
8412 if Ekind
(Scope
(Typ
)) /= E_Package
8413 or else Scope
(Typ
) /= Current_Scope
8417 -- If the type is a generic actual (sub)type, the operation is not
8418 -- primitive either because the base type is declared elsewhere.
8420 elsif Is_Generic_Actual_Type
(Typ
) then
8423 -- Here we have a definite error of declaration after freezing
8426 if Ada_Version
>= Ada_2012
then
8428 ("equality operator must be declared before type & is "
8429 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
8431 -- In Ada 2012 mode with error turned to warning, output one
8432 -- more warning to warn that the equality operation may not
8433 -- compose. This is the consequence of ignoring the error.
8435 if Error_Msg_Warn
then
8436 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
8441 ("equality operator must be declared before type& is "
8442 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
8445 -- If we are in the package body, we could just move the
8446 -- declaration to the package spec, so add a message saying that.
8448 if In_Package_Body
(Scope
(Typ
)) then
8449 if Ada_Version
>= Ada_2012
then
8451 ("\move declaration to package spec<<", Eq_Op
);
8454 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
8457 -- Otherwise try to find the freezing point
8460 Obj_Decl
:= Next
(Parent
(Typ
));
8461 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
8462 if Nkind
(Obj_Decl
) = N_Object_Declaration
8463 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
8465 -- Freezing point, output warnings
8467 if Ada_Version
>= Ada_2012
then
8469 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
8471 ("\an equality operator cannot be declared after "
8476 ("type& is frozen by declaration (Ada 2012)?y?",
8479 ("\an equality operator cannot be declared after "
8480 & "this point (Ada 2012)?y?",
8492 -- Here if type is not frozen yet. It is illegal to have a primitive
8493 -- equality declared in the private part if the type is visible.
8495 elsif not In_Same_List
(Parent
(Typ
), Decl
)
8496 and then not Is_Limited_Type
(Typ
)
8498 -- Shouldn't we give an RM reference here???
8500 if Ada_Version
>= Ada_2012
then
8502 ("equality operator appears too late<<", Eq_Op
);
8505 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
8508 -- No error detected
8513 end Check_Untagged_Equality
;
8515 -----------------------------
8516 -- Find_Corresponding_Spec --
8517 -----------------------------
8519 function Find_Corresponding_Spec
8521 Post_Error
: Boolean := True) return Entity_Id
8523 Spec
: constant Node_Id
:= Specification
(N
);
8524 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
8528 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
8529 -- Even if fully conformant, a body may depend on a generic actual when
8530 -- the spec does not, or vice versa, in which case they were distinct
8531 -- entities in the generic.
8533 -------------------------------
8534 -- Different_Generic_Profile --
8535 -------------------------------
8537 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
8540 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
8541 -- Check that the types of corresponding formals have the same
8542 -- generic actual if any. We have to account for subtypes of a
8543 -- generic formal, declared between a spec and a body, which may
8544 -- appear distinct in an instance but matched in the generic, and
8545 -- the subtype may be used either in the spec or the body of the
8546 -- subprogram being checked.
8548 -------------------------
8549 -- Same_Generic_Actual --
8550 -------------------------
8552 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
8554 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
8555 -- Predicate to check whether S1 is a subtype of S2 in the source
8558 -------------------------
8559 -- Is_Declared_Subtype --
8560 -------------------------
8562 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
8564 return Comes_From_Source
(Parent
(S1
))
8565 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
8566 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
8567 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
8568 end Is_Declared_Subtype
;
8570 -- Start of processing for Same_Generic_Actual
8573 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
8574 or else Is_Declared_Subtype
(T1
, T2
)
8575 or else Is_Declared_Subtype
(T2
, T1
);
8576 end Same_Generic_Actual
;
8578 -- Start of processing for Different_Generic_Profile
8581 if not In_Instance
then
8584 elsif Ekind
(E
) = E_Function
8585 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
8590 F1
:= First_Formal
(Designator
);
8591 F2
:= First_Formal
(E
);
8592 while Present
(F1
) loop
8593 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
8602 end Different_Generic_Profile
;
8604 -- Start of processing for Find_Corresponding_Spec
8607 E
:= Current_Entity
(Designator
);
8608 while Present
(E
) loop
8610 -- We are looking for a matching spec. It must have the same scope,
8611 -- and the same name, and either be type conformant, or be the case
8612 -- of a library procedure spec and its body (which belong to one
8613 -- another regardless of whether they are type conformant or not).
8615 if Scope
(E
) = Current_Scope
then
8616 if Current_Scope
= Standard_Standard
8617 or else (Ekind
(E
) = Ekind
(Designator
)
8618 and then Type_Conformant
(E
, Designator
))
8620 -- Within an instantiation, we know that spec and body are
8621 -- subtype conformant, because they were subtype conformant in
8622 -- the generic. We choose the subtype-conformant entity here as
8623 -- well, to resolve spurious ambiguities in the instance that
8624 -- were not present in the generic (i.e. when two different
8625 -- types are given the same actual). If we are looking for a
8626 -- spec to match a body, full conformance is expected.
8630 -- Inherit the convention and "ghostness" of the matching
8631 -- spec to ensure proper full and subtype conformance.
8633 Set_Convention
(Designator
, Convention
(E
));
8635 -- Skip past subprogram bodies and subprogram renamings that
8636 -- may appear to have a matching spec, but that aren't fully
8637 -- conformant with it. That can occur in cases where an
8638 -- actual type causes unrelated homographs in the instance.
8640 if Nkind_In
(N
, N_Subprogram_Body
,
8641 N_Subprogram_Renaming_Declaration
)
8642 and then Present
(Homonym
(E
))
8643 and then not Fully_Conformant
(Designator
, E
)
8647 elsif not Subtype_Conformant
(Designator
, E
) then
8650 elsif Different_Generic_Profile
(E
) then
8655 -- Ada 2012 (AI05-0165): For internally generated bodies of
8656 -- null procedures locate the internally generated spec. We
8657 -- enforce mode conformance since a tagged type may inherit
8658 -- from interfaces several null primitives which differ only
8659 -- in the mode of the formals.
8661 if not (Comes_From_Source
(E
))
8662 and then Is_Null_Procedure
(E
)
8663 and then not Mode_Conformant
(Designator
, E
)
8667 -- For null procedures coming from source that are completions,
8668 -- analysis of the generated body will establish the link.
8670 elsif Comes_From_Source
(E
)
8671 and then Nkind
(Spec
) = N_Procedure_Specification
8672 and then Null_Present
(Spec
)
8676 -- Expression functions can be completions, but cannot be
8677 -- completed by an explicit body.
8679 elsif Comes_From_Source
(E
)
8680 and then Comes_From_Source
(N
)
8681 and then Nkind
(N
) = N_Subprogram_Body
8682 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
8683 N_Expression_Function
8685 Error_Msg_Sloc
:= Sloc
(E
);
8686 Error_Msg_N
("body conflicts with expression function#", N
);
8689 elsif not Has_Completion
(E
) then
8690 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
8691 Set_Corresponding_Spec
(N
, E
);
8694 Set_Has_Completion
(E
);
8697 elsif Nkind
(Parent
(N
)) = N_Subunit
then
8699 -- If this is the proper body of a subunit, the completion
8700 -- flag is set when analyzing the stub.
8704 -- If E is an internal function with a controlling result that
8705 -- was created for an operation inherited by a null extension,
8706 -- it may be overridden by a body without a previous spec (one
8707 -- more reason why these should be shunned). In that case we
8708 -- remove the generated body if present, because the current
8709 -- one is the explicit overriding.
8711 elsif Ekind
(E
) = E_Function
8712 and then Ada_Version
>= Ada_2005
8713 and then not Comes_From_Source
(E
)
8714 and then Has_Controlling_Result
(E
)
8715 and then Is_Null_Extension
(Etype
(E
))
8716 and then Comes_From_Source
(Spec
)
8718 Set_Has_Completion
(E
, False);
8721 and then Nkind
(Parent
(E
)) = N_Function_Specification
8724 (Unit_Declaration_Node
8725 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
8729 -- If expansion is disabled, or if the wrapper function has
8730 -- not been generated yet, this a late body overriding an
8731 -- inherited operation, or it is an overriding by some other
8732 -- declaration before the controlling result is frozen. In
8733 -- either case this is a declaration of a new entity.
8739 -- If the body already exists, then this is an error unless
8740 -- the previous declaration is the implicit declaration of a
8741 -- derived subprogram. It is also legal for an instance to
8742 -- contain type conformant overloadable declarations (but the
8743 -- generic declaration may not), per 8.3(26/2).
8745 elsif No
(Alias
(E
))
8746 and then not Is_Intrinsic_Subprogram
(E
)
8747 and then not In_Instance
8750 Error_Msg_Sloc
:= Sloc
(E
);
8752 if Is_Imported
(E
) then
8754 ("body not allowed for imported subprogram & declared#",
8757 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
8761 -- Child units cannot be overloaded, so a conformance mismatch
8762 -- between body and a previous spec is an error.
8764 elsif Is_Child_Unit
(E
)
8766 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
8768 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
8773 ("body of child unit does not match previous declaration", N
);
8781 -- On exit, we know that no previous declaration of subprogram exists
8784 end Find_Corresponding_Spec
;
8786 ----------------------
8787 -- Fully_Conformant --
8788 ----------------------
8790 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8793 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
8795 end Fully_Conformant
;
8797 ----------------------------------
8798 -- Fully_Conformant_Expressions --
8799 ----------------------------------
8801 function Fully_Conformant_Expressions
8802 (Given_E1
: Node_Id
;
8803 Given_E2
: Node_Id
) return Boolean
8805 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
8806 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
8807 -- We always test conformance on original nodes, since it is possible
8808 -- for analysis and/or expansion to make things look as though they
8809 -- conform when they do not, e.g. by converting 1+2 into 3.
8811 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
8812 renames Fully_Conformant_Expressions
;
8814 function FCL
(L1
, L2
: List_Id
) return Boolean;
8815 -- Compare elements of two lists for conformance. Elements have to be
8816 -- conformant, and actuals inserted as default parameters do not match
8817 -- explicit actuals with the same value.
8819 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
8820 -- Compare an operator node with a function call
8826 function FCL
(L1
, L2
: List_Id
) return Boolean is
8830 if L1
= No_List
then
8836 if L2
= No_List
then
8842 -- Compare two lists, skipping rewrite insertions (we want to compare
8843 -- the original trees, not the expanded versions).
8846 if Is_Rewrite_Insertion
(N1
) then
8848 elsif Is_Rewrite_Insertion
(N2
) then
8854 elsif not FCE
(N1
, N2
) then
8867 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
8868 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
8873 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
8878 Act
:= First
(Actuals
);
8880 if Nkind
(Op_Node
) in N_Binary_Op
then
8881 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
8888 return Present
(Act
)
8889 and then FCE
(Right_Opnd
(Op_Node
), Act
)
8890 and then No
(Next
(Act
));
8894 -- Start of processing for Fully_Conformant_Expressions
8897 -- Nonconformant if paren count does not match. Note: if some idiot
8898 -- complains that we don't do this right for more than 3 levels of
8899 -- parentheses, they will be treated with the respect they deserve.
8901 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
8904 -- If same entities are referenced, then they are conformant even if
8905 -- they have different forms (RM 8.3.1(19-20)).
8907 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
8908 if Present
(Entity
(E1
)) then
8909 return Entity
(E1
) = Entity
(E2
)
8911 -- One may be a discriminant that has been replaced by the
8912 -- corresponding discriminal.
8915 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8916 and then Ekind
(Entity
(E1
)) = E_Discriminant
8917 and then Ekind
(Entity
(E2
)) = E_In_Parameter
)
8919 -- The discriminant of a protected type is transformed into
8920 -- a local constant and then into a parameter of a protected
8924 (Ekind
(Entity
(E1
)) = E_Constant
8925 and then Ekind
(Entity
(E2
)) = E_In_Parameter
8926 and then Present
(Discriminal_Link
(Entity
(E1
)))
8927 and then Discriminal_Link
(Entity
(E1
)) =
8928 Discriminal_Link
(Entity
(E2
)))
8930 -- AI12-050: The loop variables of quantified expressions
8931 -- match if they have the same identifier, even though they
8932 -- are different entities.
8935 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8936 and then Ekind
(Entity
(E1
)) = E_Loop_Parameter
8937 and then Ekind
(Entity
(E2
)) = E_Loop_Parameter
);
8939 elsif Nkind
(E1
) = N_Expanded_Name
8940 and then Nkind
(E2
) = N_Expanded_Name
8941 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8942 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8944 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
8947 -- Identifiers in component associations don't always have
8948 -- entities, but their names must conform.
8950 return Nkind
(E1
) = N_Identifier
8951 and then Nkind
(E2
) = N_Identifier
8952 and then Chars
(E1
) = Chars
(E2
);
8955 elsif Nkind
(E1
) = N_Character_Literal
8956 and then Nkind
(E2
) = N_Expanded_Name
8958 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8959 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
8961 elsif Nkind
(E2
) = N_Character_Literal
8962 and then Nkind
(E1
) = N_Expanded_Name
8964 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8965 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
8967 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
8968 return FCO
(E1
, E2
);
8970 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
8971 return FCO
(E2
, E1
);
8973 -- Otherwise we must have the same syntactic entity
8975 elsif Nkind
(E1
) /= Nkind
(E2
) then
8978 -- At this point, we specialize by node type
8984 FCL
(Expressions
(E1
), Expressions
(E2
))
8986 FCL
(Component_Associations
(E1
),
8987 Component_Associations
(E2
));
8990 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
8992 Nkind
(Expression
(E2
)) = N_Qualified_Expression
8994 return FCE
(Expression
(E1
), Expression
(E2
));
8996 -- Check that the subtype marks and any constraints
9001 Indic1
: constant Node_Id
:= Expression
(E1
);
9002 Indic2
: constant Node_Id
:= Expression
(E2
);
9007 if Nkind
(Indic1
) /= N_Subtype_Indication
then
9009 Nkind
(Indic2
) /= N_Subtype_Indication
9010 and then Entity
(Indic1
) = Entity
(Indic2
);
9012 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
9014 Nkind
(Indic1
) /= N_Subtype_Indication
9015 and then Entity
(Indic1
) = Entity
(Indic2
);
9018 if Entity
(Subtype_Mark
(Indic1
)) /=
9019 Entity
(Subtype_Mark
(Indic2
))
9024 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
9025 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
9026 while Present
(Elt1
) and then Present
(Elt2
) loop
9027 if not FCE
(Elt1
, Elt2
) then
9040 when N_Attribute_Reference
=>
9042 Attribute_Name
(E1
) = Attribute_Name
(E2
)
9043 and then FCL
(Expressions
(E1
), Expressions
(E2
));
9047 Entity
(E1
) = Entity
(E2
)
9048 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9049 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9051 when N_Membership_Test
9055 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9057 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9059 when N_Case_Expression
=>
9065 if not FCE
(Expression
(E1
), Expression
(E2
)) then
9069 Alt1
:= First
(Alternatives
(E1
));
9070 Alt2
:= First
(Alternatives
(E2
));
9072 if Present
(Alt1
) /= Present
(Alt2
) then
9074 elsif No
(Alt1
) then
9078 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
9079 or else not FCL
(Discrete_Choices
(Alt1
),
9080 Discrete_Choices
(Alt2
))
9091 when N_Character_Literal
=>
9093 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
9095 when N_Component_Association
=>
9097 FCL
(Choices
(E1
), Choices
(E2
))
9099 FCE
(Expression
(E1
), Expression
(E2
));
9101 when N_Explicit_Dereference
=>
9103 FCE
(Prefix
(E1
), Prefix
(E2
));
9105 when N_Extension_Aggregate
=>
9107 FCL
(Expressions
(E1
), Expressions
(E2
))
9108 and then Null_Record_Present
(E1
) =
9109 Null_Record_Present
(E2
)
9110 and then FCL
(Component_Associations
(E1
),
9111 Component_Associations
(E2
));
9113 when N_Function_Call
=>
9115 FCE
(Name
(E1
), Name
(E2
))
9117 FCL
(Parameter_Associations
(E1
),
9118 Parameter_Associations
(E2
));
9120 when N_If_Expression
=>
9122 FCL
(Expressions
(E1
), Expressions
(E2
));
9124 when N_Indexed_Component
=>
9126 FCE
(Prefix
(E1
), Prefix
(E2
))
9128 FCL
(Expressions
(E1
), Expressions
(E2
));
9130 when N_Integer_Literal
=>
9131 return (Intval
(E1
) = Intval
(E2
));
9136 when N_Operator_Symbol
=>
9138 Chars
(E1
) = Chars
(E2
);
9140 when N_Others_Choice
=>
9143 when N_Parameter_Association
=>
9145 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
9146 and then FCE
(Explicit_Actual_Parameter
(E1
),
9147 Explicit_Actual_Parameter
(E2
));
9149 when N_Qualified_Expression
9151 | N_Unchecked_Type_Conversion
9154 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
9156 FCE
(Expression
(E1
), Expression
(E2
));
9158 when N_Quantified_Expression
=>
9159 if not FCE
(Condition
(E1
), Condition
(E2
)) then
9163 if Present
(Loop_Parameter_Specification
(E1
))
9164 and then Present
(Loop_Parameter_Specification
(E2
))
9167 L1
: constant Node_Id
:=
9168 Loop_Parameter_Specification
(E1
);
9169 L2
: constant Node_Id
:=
9170 Loop_Parameter_Specification
(E2
);
9174 Reverse_Present
(L1
) = Reverse_Present
(L2
)
9176 FCE
(Defining_Identifier
(L1
),
9177 Defining_Identifier
(L2
))
9179 FCE
(Discrete_Subtype_Definition
(L1
),
9180 Discrete_Subtype_Definition
(L2
));
9183 elsif Present
(Iterator_Specification
(E1
))
9184 and then Present
(Iterator_Specification
(E2
))
9187 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
9188 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
9192 FCE
(Defining_Identifier
(I1
),
9193 Defining_Identifier
(I2
))
9195 Of_Present
(I1
) = Of_Present
(I2
)
9197 Reverse_Present
(I1
) = Reverse_Present
(I2
)
9198 and then FCE
(Name
(I1
), Name
(I2
))
9199 and then FCE
(Subtype_Indication
(I1
),
9200 Subtype_Indication
(I2
));
9203 -- The quantified expressions used different specifications to
9204 -- walk their respective ranges.
9212 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
9214 FCE
(High_Bound
(E1
), High_Bound
(E2
));
9216 when N_Real_Literal
=>
9217 return (Realval
(E1
) = Realval
(E2
));
9219 when N_Selected_Component
=>
9221 FCE
(Prefix
(E1
), Prefix
(E2
))
9223 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
9227 FCE
(Prefix
(E1
), Prefix
(E2
))
9229 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
9231 when N_String_Literal
=>
9233 S1
: constant String_Id
:= Strval
(E1
);
9234 S2
: constant String_Id
:= Strval
(E2
);
9235 L1
: constant Nat
:= String_Length
(S1
);
9236 L2
: constant Nat
:= String_Length
(S2
);
9243 for J
in 1 .. L1
loop
9244 if Get_String_Char
(S1
, J
) /=
9245 Get_String_Char
(S2
, J
)
9257 Entity
(E1
) = Entity
(E2
)
9259 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9261 -- All other node types cannot appear in this context. Strictly
9262 -- we should raise a fatal internal error. Instead we just ignore
9263 -- the nodes. This means that if anyone makes a mistake in the
9264 -- expander and mucks an expression tree irretrievably, the result
9265 -- will be a failure to detect a (probably very obscure) case
9266 -- of non-conformance, which is better than bombing on some
9267 -- case where two expressions do in fact conform.
9273 end Fully_Conformant_Expressions
;
9275 ----------------------------------------
9276 -- Fully_Conformant_Discrete_Subtypes --
9277 ----------------------------------------
9279 function Fully_Conformant_Discrete_Subtypes
9280 (Given_S1
: Node_Id
;
9281 Given_S2
: Node_Id
) return Boolean
9283 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
9284 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
9286 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
9287 -- Special-case for a bound given by a discriminant, which in the body
9288 -- is replaced with the discriminal of the enclosing type.
9290 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
9291 -- Check both bounds
9293 -----------------------
9294 -- Conforming_Bounds --
9295 -----------------------
9297 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
9299 if Is_Entity_Name
(B1
)
9300 and then Is_Entity_Name
(B2
)
9301 and then Ekind
(Entity
(B1
)) = E_Discriminant
9303 return Chars
(B1
) = Chars
(B2
);
9306 return Fully_Conformant_Expressions
(B1
, B2
);
9308 end Conforming_Bounds
;
9310 -----------------------
9311 -- Conforming_Ranges --
9312 -----------------------
9314 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
9317 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
9319 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
9320 end Conforming_Ranges
;
9322 -- Start of processing for Fully_Conformant_Discrete_Subtypes
9325 if Nkind
(S1
) /= Nkind
(S2
) then
9328 elsif Is_Entity_Name
(S1
) then
9329 return Entity
(S1
) = Entity
(S2
);
9331 elsif Nkind
(S1
) = N_Range
then
9332 return Conforming_Ranges
(S1
, S2
);
9334 elsif Nkind
(S1
) = N_Subtype_Indication
then
9336 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
9339 (Range_Expression
(Constraint
(S1
)),
9340 Range_Expression
(Constraint
(S2
)));
9344 end Fully_Conformant_Discrete_Subtypes
;
9346 --------------------
9347 -- Install_Entity --
9348 --------------------
9350 procedure Install_Entity
(E
: Entity_Id
) is
9351 Prev
: constant Entity_Id
:= Current_Entity
(E
);
9353 Set_Is_Immediately_Visible
(E
);
9354 Set_Current_Entity
(E
);
9355 Set_Homonym
(E
, Prev
);
9358 ---------------------
9359 -- Install_Formals --
9360 ---------------------
9362 procedure Install_Formals
(Id
: Entity_Id
) is
9365 F
:= First_Formal
(Id
);
9366 while Present
(F
) loop
9370 end Install_Formals
;
9372 -----------------------------
9373 -- Is_Interface_Conformant --
9374 -----------------------------
9376 function Is_Interface_Conformant
9377 (Tagged_Type
: Entity_Id
;
9378 Iface_Prim
: Entity_Id
;
9379 Prim
: Entity_Id
) return Boolean
9381 -- The operation may in fact be an inherited (implicit) operation
9382 -- rather than the original interface primitive, so retrieve the
9383 -- ultimate ancestor.
9385 Iface
: constant Entity_Id
:=
9386 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
9387 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
9389 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
9390 -- Return the controlling formal of Prim
9392 ------------------------
9393 -- Controlling_Formal --
9394 ------------------------
9396 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
9400 E
:= First_Entity
(Prim
);
9401 while Present
(E
) loop
9402 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
9410 end Controlling_Formal
;
9414 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
9415 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
9417 -- Start of processing for Is_Interface_Conformant
9420 pragma Assert
(Is_Subprogram
(Iface_Prim
)
9421 and then Is_Subprogram
(Prim
)
9422 and then Is_Dispatching_Operation
(Iface_Prim
)
9423 and then Is_Dispatching_Operation
(Prim
));
9425 pragma Assert
(Is_Interface
(Iface
)
9426 or else (Present
(Alias
(Iface_Prim
))
9429 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
9431 if Prim
= Iface_Prim
9432 or else not Is_Subprogram
(Prim
)
9433 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
9434 or else not Is_Dispatching_Operation
(Prim
)
9435 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
9437 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
9438 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
9442 -- The mode of the controlling formals must match
9444 elsif Present
(Iface_Ctrl_F
)
9445 and then Present
(Prim_Ctrl_F
)
9446 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
9450 -- Case of a procedure, or a function whose result type matches the
9451 -- result type of the interface primitive, or a function that has no
9452 -- controlling result (I or access I).
9454 elsif Ekind
(Iface_Prim
) = E_Procedure
9455 or else Etype
(Prim
) = Etype
(Iface_Prim
)
9456 or else not Has_Controlling_Result
(Prim
)
9458 return Type_Conformant
9459 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
9461 -- Case of a function returning an interface, or an access to one. Check
9462 -- that the return types correspond.
9464 elsif Implements_Interface
(Typ
, Iface
) then
9465 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
9467 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
9472 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
9473 Skip_Controlling_Formals
=> True);
9479 end Is_Interface_Conformant
;
9481 ---------------------------------
9482 -- Is_Non_Overriding_Operation --
9483 ---------------------------------
9485 function Is_Non_Overriding_Operation
9486 (Prev_E
: Entity_Id
;
9487 New_E
: Entity_Id
) return Boolean
9491 G_Typ
: Entity_Id
:= Empty
;
9493 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
9494 -- If F_Type is a derived type associated with a generic actual subtype,
9495 -- then return its Generic_Parent_Type attribute, else return Empty.
9497 function Types_Correspond
9498 (P_Type
: Entity_Id
;
9499 N_Type
: Entity_Id
) return Boolean;
9500 -- Returns true if and only if the types (or designated types in the
9501 -- case of anonymous access types) are the same or N_Type is derived
9502 -- directly or indirectly from P_Type.
9504 -----------------------------
9505 -- Get_Generic_Parent_Type --
9506 -----------------------------
9508 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
9514 if Is_Derived_Type
(F_Typ
)
9515 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
9517 -- The tree must be traversed to determine the parent subtype in
9518 -- the generic unit, which unfortunately isn't always available
9519 -- via semantic attributes. ??? (Note: The use of Original_Node
9520 -- is needed for cases where a full derived type has been
9523 -- If the parent type is a scalar type, the derivation creates
9524 -- an anonymous base type for it, and the source type is its
9527 if Is_Scalar_Type
(F_Typ
)
9528 and then not Comes_From_Source
(F_Typ
)
9532 (Original_Node
(Parent
(First_Subtype
(F_Typ
))));
9534 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
9536 if Nkind
(Defn
) = N_Derived_Type_Definition
then
9537 Indic
:= Subtype_Indication
(Defn
);
9539 if Nkind
(Indic
) = N_Subtype_Indication
then
9540 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
9542 G_Typ
:= Entity
(Indic
);
9545 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
9546 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
9548 return Generic_Parent_Type
(Parent
(G_Typ
));
9554 end Get_Generic_Parent_Type
;
9556 ----------------------
9557 -- Types_Correspond --
9558 ----------------------
9560 function Types_Correspond
9561 (P_Type
: Entity_Id
;
9562 N_Type
: Entity_Id
) return Boolean
9564 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
9565 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
9568 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
9569 Prev_Type
:= Designated_Type
(Prev_Type
);
9572 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
9573 New_Type
:= Designated_Type
(New_Type
);
9576 if Prev_Type
= New_Type
then
9579 elsif not Is_Class_Wide_Type
(New_Type
) then
9580 while Etype
(New_Type
) /= New_Type
loop
9581 New_Type
:= Etype
(New_Type
);
9583 if New_Type
= Prev_Type
then
9589 end Types_Correspond
;
9591 -- Start of processing for Is_Non_Overriding_Operation
9594 -- In the case where both operations are implicit derived subprograms
9595 -- then neither overrides the other. This can only occur in certain
9596 -- obscure cases (e.g., derivation from homographs created in a generic
9599 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
9602 elsif Ekind
(Current_Scope
) = E_Package
9603 and then Is_Generic_Instance
(Current_Scope
)
9604 and then In_Private_Part
(Current_Scope
)
9605 and then Comes_From_Source
(New_E
)
9607 -- We examine the formals and result type of the inherited operation,
9608 -- to determine whether their type is derived from (the instance of)
9609 -- a generic type. The first such formal or result type is the one
9612 Formal
:= First_Formal
(Prev_E
);
9614 while Present
(Formal
) loop
9615 F_Typ
:= Base_Type
(Etype
(Formal
));
9617 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
9618 F_Typ
:= Designated_Type
(F_Typ
);
9621 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
9622 exit when Present
(G_Typ
);
9624 Next_Formal
(Formal
);
9627 -- If the function dispatches on result check the result type
9629 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
9630 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
9637 -- If the generic type is a private type, then the original operation
9638 -- was not overriding in the generic, because there was no primitive
9639 -- operation to override.
9641 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
9642 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
9643 N_Formal_Private_Type_Definition
9647 -- The generic parent type is the ancestor of a formal derived
9648 -- type declaration. We need to check whether it has a primitive
9649 -- operation that should be overridden by New_E in the generic.
9653 P_Formal
: Entity_Id
;
9654 N_Formal
: Entity_Id
;
9658 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
9661 while Present
(Prim_Elt
) loop
9662 P_Prim
:= Node
(Prim_Elt
);
9664 if Chars
(P_Prim
) = Chars
(New_E
)
9665 and then Ekind
(P_Prim
) = Ekind
(New_E
)
9667 P_Formal
:= First_Formal
(P_Prim
);
9668 N_Formal
:= First_Formal
(New_E
);
9669 while Present
(P_Formal
) and then Present
(N_Formal
) loop
9670 P_Typ
:= Etype
(P_Formal
);
9671 N_Typ
:= Etype
(N_Formal
);
9673 if not Types_Correspond
(P_Typ
, N_Typ
) then
9677 Next_Entity
(P_Formal
);
9678 Next_Entity
(N_Formal
);
9681 -- Found a matching primitive operation belonging to the
9682 -- formal ancestor type, so the new subprogram is
9686 and then No
(N_Formal
)
9687 and then (Ekind
(New_E
) /= E_Function
9690 (Etype
(P_Prim
), Etype
(New_E
)))
9696 Next_Elmt
(Prim_Elt
);
9699 -- If no match found, then the new subprogram does not override
9700 -- in the generic (nor in the instance).
9702 -- If the type in question is not abstract, and the subprogram
9703 -- is, this will be an error if the new operation is in the
9704 -- private part of the instance. Emit a warning now, which will
9705 -- make the subsequent error message easier to understand.
9707 if Present
(F_Typ
) and then not Is_Abstract_Type
(F_Typ
)
9708 and then Is_Abstract_Subprogram
(Prev_E
)
9709 and then In_Private_Part
(Current_Scope
)
9711 Error_Msg_Node_2
:= F_Typ
;
9713 ("private operation& in generic unit does not override "
9714 & "any primitive operation of& (RM 12.3 (18))??",
9724 end Is_Non_Overriding_Operation
;
9726 -------------------------------------
9727 -- List_Inherited_Pre_Post_Aspects --
9728 -------------------------------------
9730 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
9732 if Opt
.List_Inherited_Aspects
9733 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
9736 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
9741 for Index
in Subps
'Range loop
9742 Items
:= Contract
(Subps
(Index
));
9744 if Present
(Items
) then
9745 Prag
:= Pre_Post_Conditions
(Items
);
9746 while Present
(Prag
) loop
9747 Error_Msg_Sloc
:= Sloc
(Prag
);
9749 if Class_Present
(Prag
)
9750 and then not Split_PPC
(Prag
)
9752 if Pragma_Name
(Prag
) = Name_Precondition
then
9754 ("info: & inherits `Pre''Class` aspect from "
9758 ("info: & inherits `Post''Class` aspect from "
9763 Prag
:= Next_Pragma
(Prag
);
9769 end List_Inherited_Pre_Post_Aspects
;
9771 ------------------------------
9772 -- Make_Inequality_Operator --
9773 ------------------------------
9775 -- S is the defining identifier of an equality operator. We build a
9776 -- subprogram declaration with the right signature. This operation is
9777 -- intrinsic, because it is always expanded as the negation of the
9778 -- call to the equality function.
9780 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
9781 Loc
: constant Source_Ptr
:= Sloc
(S
);
9784 Op_Name
: Entity_Id
;
9786 FF
: constant Entity_Id
:= First_Formal
(S
);
9787 NF
: constant Entity_Id
:= Next_Formal
(FF
);
9790 -- Check that equality was properly defined, ignore call if not
9797 A
: constant Entity_Id
:=
9798 Make_Defining_Identifier
(Sloc
(FF
),
9799 Chars
=> Chars
(FF
));
9801 B
: constant Entity_Id
:=
9802 Make_Defining_Identifier
(Sloc
(NF
),
9803 Chars
=> Chars
(NF
));
9806 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
9808 Formals
:= New_List
(
9809 Make_Parameter_Specification
(Loc
,
9810 Defining_Identifier
=> A
,
9812 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
9813 Sloc
(Etype
(First_Formal
(S
))))),
9815 Make_Parameter_Specification
(Loc
,
9816 Defining_Identifier
=> B
,
9818 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
9819 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
9822 Make_Subprogram_Declaration
(Loc
,
9824 Make_Function_Specification
(Loc
,
9825 Defining_Unit_Name
=> Op_Name
,
9826 Parameter_Specifications
=> Formals
,
9827 Result_Definition
=>
9828 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
9830 -- Insert inequality right after equality if it is explicit or after
9831 -- the derived type when implicit. These entities are created only
9832 -- for visibility purposes, and eventually replaced in the course
9833 -- of expansion, so they do not need to be attached to the tree and
9834 -- seen by the back-end. Keeping them internal also avoids spurious
9835 -- freezing problems. The declaration is inserted in the tree for
9836 -- analysis, and removed afterwards. If the equality operator comes
9837 -- from an explicit declaration, attach the inequality immediately
9838 -- after. Else the equality is inherited from a derived type
9839 -- declaration, so insert inequality after that declaration.
9841 if No
(Alias
(S
)) then
9842 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
9843 elsif Is_List_Member
(Parent
(S
)) then
9844 Insert_After
(Parent
(S
), Decl
);
9846 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
9849 Mark_Rewrite_Insertion
(Decl
);
9850 Set_Is_Intrinsic_Subprogram
(Op_Name
);
9853 Set_Has_Completion
(Op_Name
);
9854 Set_Corresponding_Equality
(Op_Name
, S
);
9855 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
9857 end Make_Inequality_Operator
;
9859 ----------------------
9860 -- May_Need_Actuals --
9861 ----------------------
9863 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
9868 F
:= First_Formal
(Fun
);
9870 while Present
(F
) loop
9871 if No
(Default_Value
(F
)) then
9879 Set_Needs_No_Actuals
(Fun
, B
);
9880 end May_Need_Actuals
;
9882 ---------------------
9883 -- Mode_Conformant --
9884 ---------------------
9886 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
9889 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
9891 end Mode_Conformant
;
9893 ---------------------------
9894 -- New_Overloaded_Entity --
9895 ---------------------------
9897 procedure New_Overloaded_Entity
9899 Derived_Type
: Entity_Id
:= Empty
)
9901 Overridden_Subp
: Entity_Id
:= Empty
;
9902 -- Set if the current scope has an operation that is type-conformant
9903 -- with S, and becomes hidden by S.
9905 Is_Primitive_Subp
: Boolean;
9906 -- Set to True if the new subprogram is primitive
9909 -- Entity that S overrides
9911 Prev_Vis
: Entity_Id
:= Empty
;
9912 -- Predecessor of E in Homonym chain
9914 procedure Check_For_Primitive_Subprogram
9915 (Is_Primitive
: out Boolean;
9916 Is_Overriding
: Boolean := False);
9917 -- If the subprogram being analyzed is a primitive operation of the type
9918 -- of a formal or result, set the Has_Primitive_Operations flag on the
9919 -- type, and set Is_Primitive to True (otherwise set to False). Set the
9920 -- corresponding flag on the entity itself for later use.
9922 function Has_Matching_Entry_Or_Subprogram
(E
: Entity_Id
) return Boolean;
9923 -- True if a) E is a subprogram whose first formal is a concurrent type
9924 -- defined in the scope of E that has some entry or subprogram whose
9925 -- profile matches E, or b) E is an internally built dispatching
9926 -- subprogram of a protected type and there is a matching subprogram
9927 -- defined in the enclosing scope of the protected type, or c) E is
9928 -- an entry of a synchronized type and a matching procedure has been
9929 -- previously defined in the enclosing scope of the synchronized type.
9931 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
9932 -- Check that E is declared in the private part of the current package,
9933 -- or in the package body, where it may hide a previous declaration.
9934 -- We can't use In_Private_Part by itself because this flag is also
9935 -- set when freezing entities, so we must examine the place of the
9936 -- declaration in the tree, and recognize wrapper packages as well.
9938 function Is_Overriding_Alias
9940 New_E
: Entity_Id
) return Boolean;
9941 -- Check whether new subprogram and old subprogram are both inherited
9942 -- from subprograms that have distinct dispatch table entries. This can
9943 -- occur with derivations from instances with accidental homonyms. The
9944 -- function is conservative given that the converse is only true within
9945 -- instances that contain accidental overloadings.
9947 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
);
9948 -- Report conflict between entities S and E
9950 ------------------------------------
9951 -- Check_For_Primitive_Subprogram --
9952 ------------------------------------
9954 procedure Check_For_Primitive_Subprogram
9955 (Is_Primitive
: out Boolean;
9956 Is_Overriding
: Boolean := False)
9962 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
9963 -- Returns true if T is declared in the visible part of the current
9964 -- package scope; otherwise returns false. Assumes that T is declared
9967 procedure Check_Private_Overriding
(T
: Entity_Id
);
9968 -- Checks that if a primitive abstract subprogram of a visible
9969 -- abstract type is declared in a private part, then it must override
9970 -- an abstract subprogram declared in the visible part. Also checks
9971 -- that if a primitive function with a controlling result is declared
9972 -- in a private part, then it must override a function declared in
9973 -- the visible part.
9975 ------------------------------
9976 -- Check_Private_Overriding --
9977 ------------------------------
9979 procedure Check_Private_Overriding
(T
: Entity_Id
) is
9980 function Overrides_Private_Part_Op
return Boolean;
9981 -- This detects the special case where the overriding subprogram
9982 -- is overriding a subprogram that was declared in the same
9983 -- private part. That case is illegal by 3.9.3(10).
9985 function Overrides_Visible_Function
9986 (Partial_View
: Entity_Id
) return Boolean;
9987 -- True if S overrides a function in the visible part. The
9988 -- overridden function could be explicitly or implicitly declared.
9990 -------------------------------
9991 -- Overrides_Private_Part_Op --
9992 -------------------------------
9994 function Overrides_Private_Part_Op
return Boolean is
9995 Over_Decl
: constant Node_Id
:=
9996 Unit_Declaration_Node
(Overridden_Operation
(S
));
9997 Subp_Decl
: constant Node_Id
:= Unit_Declaration_Node
(S
);
10000 pragma Assert
(Is_Overriding
);
10002 (Nkind
(Over_Decl
) = N_Abstract_Subprogram_Declaration
);
10004 (Nkind
(Subp_Decl
) = N_Abstract_Subprogram_Declaration
);
10006 return In_Same_List
(Over_Decl
, Subp_Decl
);
10007 end Overrides_Private_Part_Op
;
10009 --------------------------------
10010 -- Overrides_Visible_Function --
10011 --------------------------------
10013 function Overrides_Visible_Function
10014 (Partial_View
: Entity_Id
) return Boolean
10017 if not Is_Overriding
or else not Has_Homonym
(S
) then
10021 if not Present
(Partial_View
) then
10025 -- Search through all the homonyms H of S in the current
10026 -- package spec, and return True if we find one that matches.
10027 -- Note that Parent (H) will be the declaration of the
10028 -- partial view of T for a match.
10031 H
: Entity_Id
:= S
;
10035 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
10039 N_Private_Extension_Declaration
,
10040 N_Private_Type_Declaration
)
10041 and then Defining_Identifier
(Parent
(H
)) = Partial_View
10049 end Overrides_Visible_Function
;
10051 -- Start of processing for Check_Private_Overriding
10054 if Is_Package_Or_Generic_Package
(Current_Scope
)
10055 and then In_Private_Part
(Current_Scope
)
10056 and then Visible_Part_Type
(T
)
10057 and then not In_Instance
10059 if Is_Abstract_Type
(T
)
10060 and then Is_Abstract_Subprogram
(S
)
10061 and then (not Is_Overriding
10062 or else not Is_Abstract_Subprogram
(E
)
10063 or else Overrides_Private_Part_Op
)
10066 ("abstract subprograms must be visible (RM 3.9.3(10))!",
10069 elsif Ekind
(S
) = E_Function
then
10071 Partial_View
: constant Entity_Id
:=
10072 Incomplete_Or_Partial_View
(T
);
10075 if not Overrides_Visible_Function
(Partial_View
) then
10077 -- Here, S is "function ... return T;" declared in
10078 -- the private part, not overriding some visible
10079 -- operation. That's illegal in the tagged case
10080 -- (but not if the private type is untagged).
10082 if ((Present
(Partial_View
)
10083 and then Is_Tagged_Type
(Partial_View
))
10084 or else (not Present
(Partial_View
)
10085 and then Is_Tagged_Type
(T
)))
10086 and then T
= Base_Type
(Etype
(S
))
10089 ("private function with tagged result must"
10090 & " override visible-part function", S
);
10092 ("\move subprogram to the visible part"
10093 & " (RM 3.9.3(10))", S
);
10095 -- AI05-0073: extend this test to the case of a
10096 -- function with a controlling access result.
10098 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
10099 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
10101 not Is_Class_Wide_Type
10102 (Designated_Type
(Etype
(S
)))
10103 and then Ada_Version
>= Ada_2012
10106 ("private function with controlling access "
10107 & "result must override visible-part function",
10110 ("\move subprogram to the visible part"
10111 & " (RM 3.9.3(10))", S
);
10117 end Check_Private_Overriding
;
10119 -----------------------
10120 -- Visible_Part_Type --
10121 -----------------------
10123 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
10124 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
10127 -- If the entity is a private type, then it must be declared in a
10130 if Ekind
(T
) in Private_Kind
then
10133 elsif Is_Type
(T
) and then Has_Private_Declaration
(T
) then
10136 elsif Is_List_Member
(Declaration_Node
(T
))
10137 and then List_Containing
(Declaration_Node
(T
)) =
10138 Visible_Declarations
(Specification
(P
))
10145 end Visible_Part_Type
;
10147 -- Start of processing for Check_For_Primitive_Subprogram
10150 Is_Primitive
:= False;
10152 if not Comes_From_Source
(S
) then
10155 -- If subprogram is at library level, it is not primitive operation
10157 elsif Current_Scope
= Standard_Standard
then
10160 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
10161 and then not In_Package_Body
(Current_Scope
))
10162 or else Is_Overriding
10164 -- For function, check return type
10166 if Ekind
(S
) = E_Function
then
10167 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
10168 F_Typ
:= Designated_Type
(Etype
(S
));
10170 F_Typ
:= Etype
(S
);
10173 B_Typ
:= Base_Type
(F_Typ
);
10175 if Scope
(B_Typ
) = Current_Scope
10176 and then not Is_Class_Wide_Type
(B_Typ
)
10177 and then not Is_Generic_Type
(B_Typ
)
10179 Is_Primitive
:= True;
10180 Set_Has_Primitive_Operations
(B_Typ
);
10181 Set_Is_Primitive
(S
);
10182 Check_Private_Overriding
(B_Typ
);
10184 -- The Ghost policy in effect at the point of declaration
10185 -- or a tagged type and a primitive operation must match
10186 -- (SPARK RM 6.9(16)).
10188 Check_Ghost_Primitive
(S
, B_Typ
);
10192 -- For all subprograms, check formals
10194 Formal
:= First_Formal
(S
);
10195 while Present
(Formal
) loop
10196 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
10197 F_Typ
:= Designated_Type
(Etype
(Formal
));
10199 F_Typ
:= Etype
(Formal
);
10202 B_Typ
:= Base_Type
(F_Typ
);
10204 if Ekind
(B_Typ
) = E_Access_Subtype
then
10205 B_Typ
:= Base_Type
(B_Typ
);
10208 if Scope
(B_Typ
) = Current_Scope
10209 and then not Is_Class_Wide_Type
(B_Typ
)
10210 and then not Is_Generic_Type
(B_Typ
)
10212 Is_Primitive
:= True;
10213 Set_Is_Primitive
(S
);
10214 Set_Has_Primitive_Operations
(B_Typ
);
10215 Check_Private_Overriding
(B_Typ
);
10217 -- The Ghost policy in effect at the point of declaration
10218 -- of a tagged type and a primitive operation must match
10219 -- (SPARK RM 6.9(16)).
10221 Check_Ghost_Primitive
(S
, B_Typ
);
10224 Next_Formal
(Formal
);
10227 -- Special case: An equality function can be redefined for a type
10228 -- occurring in a declarative part, and won't otherwise be treated as
10229 -- a primitive because it doesn't occur in a package spec and doesn't
10230 -- override an inherited subprogram. It's important that we mark it
10231 -- primitive so it can be returned by Collect_Primitive_Operations
10232 -- and be used in composing the equality operation of later types
10233 -- that have a component of the type.
10235 elsif Chars
(S
) = Name_Op_Eq
10236 and then Etype
(S
) = Standard_Boolean
10238 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
10240 if Scope
(B_Typ
) = Current_Scope
10242 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
10243 and then not Is_Limited_Type
(B_Typ
)
10245 Is_Primitive
:= True;
10246 Set_Is_Primitive
(S
);
10247 Set_Has_Primitive_Operations
(B_Typ
);
10248 Check_Private_Overriding
(B_Typ
);
10250 -- The Ghost policy in effect at the point of declaration of a
10251 -- tagged type and a primitive operation must match
10252 -- (SPARK RM 6.9(16)).
10254 Check_Ghost_Primitive
(S
, B_Typ
);
10257 end Check_For_Primitive_Subprogram
;
10259 --------------------------------------
10260 -- Has_Matching_Entry_Or_Subprogram --
10261 --------------------------------------
10263 function Has_Matching_Entry_Or_Subprogram
10264 (E
: Entity_Id
) return Boolean
10266 function Check_Conforming_Parameters
10267 (E1_Param
: Node_Id
;
10268 E2_Param
: Node_Id
) return Boolean;
10269 -- Starting from the given parameters, check that all the parameters
10270 -- of two entries or subprograms are subtype conformant. Used to skip
10271 -- the check on the controlling argument.
10273 function Matching_Entry_Or_Subprogram
10274 (Conc_Typ
: Entity_Id
;
10275 Subp
: Entity_Id
) return Entity_Id
;
10276 -- Return the first entry or subprogram of the given concurrent type
10277 -- whose name matches the name of Subp and has a profile conformant
10278 -- with Subp; return Empty if not found.
10280 function Matching_Dispatching_Subprogram
10281 (Conc_Typ
: Entity_Id
;
10282 Ent
: Entity_Id
) return Entity_Id
;
10283 -- Return the first dispatching primitive of Conc_Type defined in the
10284 -- enclosing scope of Conc_Type (i.e. before the full definition of
10285 -- this concurrent type) whose name matches the entry Ent and has a
10286 -- profile conformant with the profile of the corresponding (not yet
10287 -- built) dispatching primitive of Ent; return Empty if not found.
10289 function Matching_Original_Protected_Subprogram
10290 (Prot_Typ
: Entity_Id
;
10291 Subp
: Entity_Id
) return Entity_Id
;
10292 -- Return the first subprogram defined in the enclosing scope of
10293 -- Prot_Typ (before the full definition of this protected type)
10294 -- whose name matches the original name of Subp and has a profile
10295 -- conformant with the profile of Subp; return Empty if not found.
10297 ---------------------------------
10298 -- Check_Confirming_Parameters --
10299 ---------------------------------
10301 function Check_Conforming_Parameters
10302 (E1_Param
: Node_Id
;
10303 E2_Param
: Node_Id
) return Boolean
10305 Param_E1
: Node_Id
:= E1_Param
;
10306 Param_E2
: Node_Id
:= E2_Param
;
10309 while Present
(Param_E1
) and then Present
(Param_E2
) loop
10310 if Ekind
(Defining_Identifier
(Param_E1
)) /=
10311 Ekind
(Defining_Identifier
(Param_E2
))
10314 (Find_Parameter_Type
(Param_E1
),
10315 Find_Parameter_Type
(Param_E2
),
10316 Subtype_Conformant
)
10325 -- The candidate is not valid if one of the two lists contains
10326 -- more parameters than the other
10328 return No
(Param_E1
) and then No
(Param_E2
);
10329 end Check_Conforming_Parameters
;
10331 ----------------------------------
10332 -- Matching_Entry_Or_Subprogram --
10333 ----------------------------------
10335 function Matching_Entry_Or_Subprogram
10336 (Conc_Typ
: Entity_Id
;
10337 Subp
: Entity_Id
) return Entity_Id
10342 E
:= First_Entity
(Conc_Typ
);
10343 while Present
(E
) loop
10344 if Chars
(Subp
) = Chars
(E
)
10345 and then (Ekind
(E
) = E_Entry
or else Is_Subprogram
(E
))
10347 Check_Conforming_Parameters
10348 (First
(Parameter_Specifications
(Parent
(E
))),
10349 Next
(First
(Parameter_Specifications
(Parent
(Subp
)))))
10358 end Matching_Entry_Or_Subprogram
;
10360 -------------------------------------
10361 -- Matching_Dispatching_Subprogram --
10362 -------------------------------------
10364 function Matching_Dispatching_Subprogram
10365 (Conc_Typ
: Entity_Id
;
10366 Ent
: Entity_Id
) return Entity_Id
10371 -- Search for entities in the enclosing scope of this synchonized
10374 pragma Assert
(Is_Concurrent_Type
(Conc_Typ
));
10375 Push_Scope
(Scope
(Conc_Typ
));
10376 E
:= Current_Entity_In_Scope
(Ent
);
10379 while Present
(E
) loop
10380 if Scope
(E
) = Scope
(Conc_Typ
)
10381 and then Comes_From_Source
(E
)
10382 and then Ekind
(E
) = E_Procedure
10383 and then Present
(First_Entity
(E
))
10384 and then Is_Controlling_Formal
(First_Entity
(E
))
10385 and then Etype
(First_Entity
(E
)) = Conc_Typ
10387 Check_Conforming_Parameters
10388 (First
(Parameter_Specifications
(Parent
(Ent
))),
10389 Next
(First
(Parameter_Specifications
(Parent
(E
)))))
10398 end Matching_Dispatching_Subprogram
;
10400 --------------------------------------------
10401 -- Matching_Original_Protected_Subprogram --
10402 --------------------------------------------
10404 function Matching_Original_Protected_Subprogram
10405 (Prot_Typ
: Entity_Id
;
10406 Subp
: Entity_Id
) return Entity_Id
10408 ICF
: constant Boolean :=
10409 Is_Controlling_Formal
(First_Entity
(Subp
));
10413 -- Temporarily decorate the first parameter of Subp as controlling
10414 -- formal, required to invoke Subtype_Conformant.
10416 Set_Is_Controlling_Formal
(First_Entity
(Subp
));
10419 Current_Entity_In_Scope
(Original_Protected_Subprogram
(Subp
));
10421 while Present
(E
) loop
10422 if Scope
(E
) = Scope
(Prot_Typ
)
10423 and then Comes_From_Source
(E
)
10424 and then Ekind
(Subp
) = Ekind
(E
)
10425 and then Present
(First_Entity
(E
))
10426 and then Is_Controlling_Formal
(First_Entity
(E
))
10427 and then Etype
(First_Entity
(E
)) = Prot_Typ
10428 and then Subtype_Conformant
(Subp
, E
,
10429 Skip_Controlling_Formals
=> True)
10431 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10438 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10441 end Matching_Original_Protected_Subprogram
;
10443 -- Start of processing for Has_Matching_Entry_Or_Subprogram
10446 -- Case 1: E is a subprogram whose first formal is a concurrent type
10447 -- defined in the scope of E that has an entry or subprogram whose
10448 -- profile matches E.
10450 if Comes_From_Source
(E
)
10451 and then Is_Subprogram
(E
)
10452 and then Present
(First_Entity
(E
))
10453 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10456 Scope
(Corresponding_Concurrent_Type
10457 (Etype
(First_Entity
(E
))))
10460 (Matching_Entry_Or_Subprogram
10461 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10464 Report_Conflict
(E
,
10465 Matching_Entry_Or_Subprogram
10466 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10471 -- Case 2: E is an internally built dispatching subprogram of a
10472 -- protected type and there is a subprogram defined in the enclosing
10473 -- scope of the protected type that has the original name of E and
10474 -- its profile is conformant with the profile of E. We check the
10475 -- name of the original protected subprogram associated with E since
10476 -- the expander builds dispatching primitives of protected functions
10477 -- and procedures with other names (see Exp_Ch9.Build_Selected_Name).
10479 elsif not Comes_From_Source
(E
)
10480 and then Is_Subprogram
(E
)
10481 and then Present
(First_Entity
(E
))
10482 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10483 and then Present
(Original_Protected_Subprogram
(E
))
10486 (Matching_Original_Protected_Subprogram
10487 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10490 Report_Conflict
(E
,
10491 Matching_Original_Protected_Subprogram
10492 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10496 -- Case 3: E is an entry of a synchronized type and a matching
10497 -- procedure has been previously defined in the enclosing scope
10498 -- of the synchronized type.
10500 elsif Comes_From_Source
(E
)
10501 and then Ekind
(E
) = E_Entry
10503 Present
(Matching_Dispatching_Subprogram
(Current_Scope
, E
))
10505 Report_Conflict
(E
,
10506 Matching_Dispatching_Subprogram
(Current_Scope
, E
));
10511 end Has_Matching_Entry_Or_Subprogram
;
10513 ----------------------------
10514 -- Is_Private_Declaration --
10515 ----------------------------
10517 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
10518 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
10519 Priv_Decls
: List_Id
;
10522 if Is_Package_Or_Generic_Package
(Current_Scope
)
10523 and then In_Private_Part
(Current_Scope
)
10526 Private_Declarations
(Package_Specification
(Current_Scope
));
10528 return In_Package_Body
(Current_Scope
)
10530 (Is_List_Member
(Decl
)
10531 and then List_Containing
(Decl
) = Priv_Decls
)
10532 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
10534 Is_Compilation_Unit
10535 (Defining_Entity
(Parent
(Decl
)))
10536 and then List_Containing
(Parent
(Parent
(Decl
))) =
10541 end Is_Private_Declaration
;
10543 --------------------------
10544 -- Is_Overriding_Alias --
10545 --------------------------
10547 function Is_Overriding_Alias
10548 (Old_E
: Entity_Id
;
10549 New_E
: Entity_Id
) return Boolean
10551 AO
: constant Entity_Id
:= Alias
(Old_E
);
10552 AN
: constant Entity_Id
:= Alias
(New_E
);
10555 return Scope
(AO
) /= Scope
(AN
)
10556 or else No
(DTC_Entity
(AO
))
10557 or else No
(DTC_Entity
(AN
))
10558 or else DT_Position
(AO
) = DT_Position
(AN
);
10559 end Is_Overriding_Alias
;
10561 ---------------------
10562 -- Report_Conflict --
10563 ---------------------
10565 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
) is
10567 Error_Msg_Sloc
:= Sloc
(E
);
10569 -- Generate message, with useful additional warning if in generic
10571 if Is_Generic_Unit
(E
) then
10572 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
10573 Error_Msg_N
("\& conflicts with declaration#", S
);
10575 Error_Msg_N
("& conflicts with declaration#", S
);
10577 end Report_Conflict
;
10579 -- Start of processing for New_Overloaded_Entity
10582 -- We need to look for an entity that S may override. This must be a
10583 -- homonym in the current scope, so we look for the first homonym of
10584 -- S in the current scope as the starting point for the search.
10586 E
:= Current_Entity_In_Scope
(S
);
10588 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
10589 -- They are directly added to the list of primitive operations of
10590 -- Derived_Type, unless this is a rederivation in the private part
10591 -- of an operation that was already derived in the visible part of
10592 -- the current package.
10594 if Ada_Version
>= Ada_2005
10595 and then Present
(Derived_Type
)
10596 and then Present
(Alias
(S
))
10597 and then Is_Dispatching_Operation
(Alias
(S
))
10598 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
10599 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
10601 -- For private types, when the full-view is processed we propagate to
10602 -- the full view the non-overridden entities whose attribute "alias"
10603 -- references an interface primitive. These entities were added by
10604 -- Derive_Subprograms to ensure that interface primitives are
10607 -- Inside_Freeze_Actions is non zero when S corresponds with an
10608 -- internal entity that links an interface primitive with its
10609 -- covering primitive through attribute Interface_Alias (see
10610 -- Add_Internal_Interface_Entities).
10612 if Inside_Freezing_Actions
= 0
10613 and then Is_Package_Or_Generic_Package
(Current_Scope
)
10614 and then In_Private_Part
(Current_Scope
)
10615 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
10616 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
10617 and then Full_View
(Defining_Identifier
(Parent
(E
)))
10618 = Defining_Identifier
(Parent
(S
))
10619 and then Alias
(E
) = Alias
(S
)
10621 Check_Operation_From_Private_View
(S
, E
);
10622 Set_Is_Dispatching_Operation
(S
);
10627 Enter_Overloaded_Entity
(S
);
10628 Check_Dispatching_Operation
(S
, Empty
);
10629 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10635 -- For synchronized types check conflicts of this entity with previously
10636 -- defined entities.
10638 if Ada_Version
>= Ada_2005
10639 and then Has_Matching_Entry_Or_Subprogram
(S
)
10644 -- If there is no homonym then this is definitely not overriding
10647 Enter_Overloaded_Entity
(S
);
10648 Check_Dispatching_Operation
(S
, Empty
);
10649 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10651 -- If subprogram has an explicit declaration, check whether it has an
10652 -- overriding indicator.
10654 if Comes_From_Source
(S
) then
10655 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10657 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
10658 -- it may have overridden some hidden inherited primitive. Update
10659 -- Overridden_Subp to avoid spurious errors when checking the
10660 -- overriding indicator.
10662 if Ada_Version
>= Ada_2012
10663 and then No
(Overridden_Subp
)
10664 and then Is_Dispatching_Operation
(S
)
10665 and then Present
(Overridden_Operation
(S
))
10667 Overridden_Subp
:= Overridden_Operation
(S
);
10670 Check_Overriding_Indicator
10671 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
10673 -- The Ghost policy in effect at the point of declaration of a
10674 -- parent subprogram and an overriding subprogram must match
10675 -- (SPARK RM 6.9(17)).
10677 Check_Ghost_Overriding
(S
, Overridden_Subp
);
10680 -- If there is a homonym that is not overloadable, then we have an
10681 -- error, except for the special cases checked explicitly below.
10683 elsif not Is_Overloadable
(E
) then
10685 -- Check for spurious conflict produced by a subprogram that has the
10686 -- same name as that of the enclosing generic package. The conflict
10687 -- occurs within an instance, between the subprogram and the renaming
10688 -- declaration for the package. After the subprogram, the package
10689 -- renaming declaration becomes hidden.
10691 if Ekind
(E
) = E_Package
10692 and then Present
(Renamed_Object
(E
))
10693 and then Renamed_Object
(E
) = Current_Scope
10694 and then Nkind
(Parent
(Renamed_Object
(E
))) =
10695 N_Package_Specification
10696 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
10699 Set_Is_Immediately_Visible
(E
, False);
10700 Enter_Overloaded_Entity
(S
);
10701 Set_Homonym
(S
, Homonym
(E
));
10702 Check_Dispatching_Operation
(S
, Empty
);
10703 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
10705 -- If the subprogram is implicit it is hidden by the previous
10706 -- declaration. However if it is dispatching, it must appear in the
10707 -- dispatch table anyway, because it can be dispatched to even if it
10708 -- cannot be called directly.
10710 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
10711 Set_Scope
(S
, Current_Scope
);
10713 if Is_Dispatching_Operation
(Alias
(S
)) then
10714 Check_Dispatching_Operation
(S
, Empty
);
10720 Report_Conflict
(S
, E
);
10724 -- E exists and is overloadable
10727 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10729 -- Loop through E and its homonyms to determine if any of them is
10730 -- the candidate for overriding by S.
10732 while Present
(E
) loop
10734 -- Definitely not interesting if not in the current scope
10736 if Scope
(E
) /= Current_Scope
then
10739 -- A function can overload the name of an abstract state. The
10740 -- state can be viewed as a function with a profile that cannot
10741 -- be matched by anything.
10743 elsif Ekind
(S
) = E_Function
10744 and then Ekind
(E
) = E_Abstract_State
10746 Enter_Overloaded_Entity
(S
);
10749 -- Ada 2012 (AI05-0165): For internally generated bodies of null
10750 -- procedures locate the internally generated spec. We enforce
10751 -- mode conformance since a tagged type may inherit from
10752 -- interfaces several null primitives which differ only in
10753 -- the mode of the formals.
10755 elsif not Comes_From_Source
(S
)
10756 and then Is_Null_Procedure
(S
)
10757 and then not Mode_Conformant
(E
, S
)
10761 -- Check if we have type conformance
10763 elsif Type_Conformant
(E
, S
) then
10765 -- If the old and new entities have the same profile and one
10766 -- is not the body of the other, then this is an error, unless
10767 -- one of them is implicitly declared.
10769 -- There are some cases when both can be implicit, for example
10770 -- when both a literal and a function that overrides it are
10771 -- inherited in a derivation, or when an inherited operation
10772 -- of a tagged full type overrides the inherited operation of
10773 -- a private extension. Ada 83 had a special rule for the
10774 -- literal case. In Ada 95, the later implicit operation hides
10775 -- the former, and the literal is always the former. In the
10776 -- odd case where both are derived operations declared at the
10777 -- same point, both operations should be declared, and in that
10778 -- case we bypass the following test and proceed to the next
10779 -- part. This can only occur for certain obscure cases in
10780 -- instances, when an operation on a type derived from a formal
10781 -- private type does not override a homograph inherited from
10782 -- the actual. In subsequent derivations of such a type, the
10783 -- DT positions of these operations remain distinct, if they
10786 if Present
(Alias
(S
))
10787 and then (No
(Alias
(E
))
10788 or else Comes_From_Source
(E
)
10789 or else Is_Abstract_Subprogram
(S
)
10791 (Is_Dispatching_Operation
(E
)
10792 and then Is_Overriding_Alias
(E
, S
)))
10793 and then Ekind
(E
) /= E_Enumeration_Literal
10795 -- When an derived operation is overloaded it may be due to
10796 -- the fact that the full view of a private extension
10797 -- re-inherits. It has to be dealt with.
10799 if Is_Package_Or_Generic_Package
(Current_Scope
)
10800 and then In_Private_Part
(Current_Scope
)
10802 Check_Operation_From_Private_View
(S
, E
);
10805 -- In any case the implicit operation remains hidden by the
10806 -- existing declaration, which is overriding. Indicate that
10807 -- E overrides the operation from which S is inherited.
10809 if Present
(Alias
(S
)) then
10810 Set_Overridden_Operation
(E
, Alias
(S
));
10811 Inherit_Subprogram_Contract
(E
, Alias
(S
));
10814 Set_Overridden_Operation
(E
, S
);
10815 Inherit_Subprogram_Contract
(E
, S
);
10818 if Comes_From_Source
(E
) then
10819 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
10821 -- The Ghost policy in effect at the point of declaration
10822 -- of a parent subprogram and an overriding subprogram
10823 -- must match (SPARK RM 6.9(17)).
10825 Check_Ghost_Overriding
(E
, S
);
10830 -- Within an instance, the renaming declarations for actual
10831 -- subprograms may become ambiguous, but they do not hide each
10834 elsif Ekind
(E
) /= E_Entry
10835 and then not Comes_From_Source
(E
)
10836 and then not Is_Generic_Instance
(E
)
10837 and then (Present
(Alias
(E
))
10838 or else Is_Intrinsic_Subprogram
(E
))
10839 and then (not In_Instance
10840 or else No
(Parent
(E
))
10841 or else Nkind
(Unit_Declaration_Node
(E
)) /=
10842 N_Subprogram_Renaming_Declaration
)
10844 -- A subprogram child unit is not allowed to override an
10845 -- inherited subprogram (10.1.1(20)).
10847 if Is_Child_Unit
(S
) then
10849 ("child unit overrides inherited subprogram in parent",
10854 if Is_Non_Overriding_Operation
(E
, S
) then
10855 Enter_Overloaded_Entity
(S
);
10857 if No
(Derived_Type
)
10858 or else Is_Tagged_Type
(Derived_Type
)
10860 Check_Dispatching_Operation
(S
, Empty
);
10866 -- E is a derived operation or an internal operator which
10867 -- is being overridden. Remove E from further visibility.
10868 -- Furthermore, if E is a dispatching operation, it must be
10869 -- replaced in the list of primitive operations of its type
10870 -- (see Override_Dispatching_Operation).
10872 Overridden_Subp
:= E
;
10878 Prev
:= First_Entity
(Current_Scope
);
10879 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
10880 Next_Entity
(Prev
);
10883 -- It is possible for E to be in the current scope and
10884 -- yet not in the entity chain. This can only occur in a
10885 -- generic context where E is an implicit concatenation
10886 -- in the formal part, because in a generic body the
10887 -- entity chain starts with the formals.
10889 -- In GNATprove mode, a wrapper for an operation with
10890 -- axiomatization may be a homonym of another declaration
10891 -- for an actual subprogram (needs refinement ???).
10895 and then GNATprove_Mode
10897 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
10898 N_Subprogram_Renaming_Declaration
10902 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
10907 -- E must be removed both from the entity_list of the
10908 -- current scope, and from the visibility chain.
10910 if Debug_Flag_E
then
10911 Write_Str
("Override implicit operation ");
10912 Write_Int
(Int
(E
));
10916 -- If E is a predefined concatenation, it stands for four
10917 -- different operations. As a result, a single explicit
10918 -- declaration does not hide it. In a possible ambiguous
10919 -- situation, Disambiguate chooses the user-defined op,
10920 -- so it is correct to retain the previous internal one.
10922 if Chars
(E
) /= Name_Op_Concat
10923 or else Ekind
(E
) /= E_Operator
10925 -- For nondispatching derived operations that are
10926 -- overridden by a subprogram declared in the private
10927 -- part of a package, we retain the derived subprogram
10928 -- but mark it as not immediately visible. If the
10929 -- derived operation was declared in the visible part
10930 -- then this ensures that it will still be visible
10931 -- outside the package with the proper signature
10932 -- (calls from outside must also be directed to this
10933 -- version rather than the overriding one, unlike the
10934 -- dispatching case). Calls from inside the package
10935 -- will still resolve to the overriding subprogram
10936 -- since the derived one is marked as not visible
10937 -- within the package.
10939 -- If the private operation is dispatching, we achieve
10940 -- the overriding by keeping the implicit operation
10941 -- but setting its alias to be the overriding one. In
10942 -- this fashion the proper body is executed in all
10943 -- cases, but the original signature is used outside
10946 -- If the overriding is not in the private part, we
10947 -- remove the implicit operation altogether.
10949 if Is_Private_Declaration
(S
) then
10950 if not Is_Dispatching_Operation
(E
) then
10951 Set_Is_Immediately_Visible
(E
, False);
10953 -- Work done in Override_Dispatching_Operation,
10954 -- so nothing else needs to be done here.
10960 -- Find predecessor of E in Homonym chain
10962 if E
= Current_Entity
(E
) then
10965 Prev_Vis
:= Current_Entity
(E
);
10966 while Homonym
(Prev_Vis
) /= E
loop
10967 Prev_Vis
:= Homonym
(Prev_Vis
);
10971 if Prev_Vis
/= Empty
then
10973 -- Skip E in the visibility chain
10975 Set_Homonym
(Prev_Vis
, Homonym
(E
));
10978 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
10981 Set_Next_Entity
(Prev
, Next_Entity
(E
));
10983 if No
(Next_Entity
(Prev
)) then
10984 Set_Last_Entity
(Current_Scope
, Prev
);
10989 Enter_Overloaded_Entity
(S
);
10991 -- For entities generated by Derive_Subprograms the
10992 -- overridden operation is the inherited primitive
10993 -- (which is available through the attribute alias).
10995 if not (Comes_From_Source
(E
))
10996 and then Is_Dispatching_Operation
(E
)
10997 and then Find_Dispatching_Type
(E
) =
10998 Find_Dispatching_Type
(S
)
10999 and then Present
(Alias
(E
))
11000 and then Comes_From_Source
(Alias
(E
))
11002 Set_Overridden_Operation
(S
, Alias
(E
));
11003 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11005 -- Normal case of setting entity as overridden
11007 -- Note: Static_Initialization and Overridden_Operation
11008 -- attributes use the same field in subprogram entities.
11009 -- Static_Initialization is only defined for internal
11010 -- initialization procedures, where Overridden_Operation
11011 -- is irrelevant. Therefore the setting of this attribute
11012 -- must check whether the target is an init_proc.
11014 elsif not Is_Init_Proc
(S
) then
11015 Set_Overridden_Operation
(S
, E
);
11016 Inherit_Subprogram_Contract
(S
, E
);
11019 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
11021 -- The Ghost policy in effect at the point of declaration
11022 -- of a parent subprogram and an overriding subprogram
11023 -- must match (SPARK RM 6.9(17)).
11025 Check_Ghost_Overriding
(S
, E
);
11027 -- If S is a user-defined subprogram or a null procedure
11028 -- expanded to override an inherited null procedure, or a
11029 -- predefined dispatching primitive then indicate that E
11030 -- overrides the operation from which S is inherited.
11032 if Comes_From_Source
(S
)
11034 (Present
(Parent
(S
))
11036 Nkind
(Parent
(S
)) = N_Procedure_Specification
11038 Null_Present
(Parent
(S
)))
11040 (Present
(Alias
(E
))
11042 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
11044 if Present
(Alias
(E
)) then
11045 Set_Overridden_Operation
(S
, Alias
(E
));
11046 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11050 if Is_Dispatching_Operation
(E
) then
11052 -- An overriding dispatching subprogram inherits the
11053 -- convention of the overridden subprogram (AI-117).
11055 Set_Convention
(S
, Convention
(E
));
11056 Check_Dispatching_Operation
(S
, E
);
11059 Check_Dispatching_Operation
(S
, Empty
);
11062 Check_For_Primitive_Subprogram
11063 (Is_Primitive_Subp
, Is_Overriding
=> True);
11064 goto Check_Inequality
;
11067 -- Apparent redeclarations in instances can occur when two
11068 -- formal types get the same actual type. The subprograms in
11069 -- in the instance are legal, even if not callable from the
11070 -- outside. Calls from within are disambiguated elsewhere.
11071 -- For dispatching operations in the visible part, the usual
11072 -- rules apply, and operations with the same profile are not
11073 -- legal (B830001).
11075 elsif (In_Instance_Visible_Part
11076 and then not Is_Dispatching_Operation
(E
))
11077 or else In_Instance_Not_Visible
11081 -- Here we have a real error (identical profile)
11084 Error_Msg_Sloc
:= Sloc
(E
);
11086 -- Avoid cascaded errors if the entity appears in
11087 -- subsequent calls.
11089 Set_Scope
(S
, Current_Scope
);
11091 -- Generate error, with extra useful warning for the case
11092 -- of a generic instance with no completion.
11094 if Is_Generic_Instance
(S
)
11095 and then not Has_Completion
(E
)
11098 ("instantiation cannot provide body for&", S
);
11099 Error_Msg_N
("\& conflicts with declaration#", S
);
11101 Error_Msg_N
("& conflicts with declaration#", S
);
11108 -- If one subprogram has an access parameter and the other
11109 -- a parameter of an access type, calls to either might be
11110 -- ambiguous. Verify that parameters match except for the
11111 -- access parameter.
11113 if May_Hide_Profile
then
11119 F1
:= First_Formal
(S
);
11120 F2
:= First_Formal
(E
);
11121 while Present
(F1
) and then Present
(F2
) loop
11122 if Is_Access_Type
(Etype
(F1
)) then
11123 if not Is_Access_Type
(Etype
(F2
))
11124 or else not Conforming_Types
11125 (Designated_Type
(Etype
(F1
)),
11126 Designated_Type
(Etype
(F2
)),
11129 May_Hide_Profile
:= False;
11133 not Conforming_Types
11134 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
11136 May_Hide_Profile
:= False;
11143 if May_Hide_Profile
11147 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
11156 -- On exit, we know that S is a new entity
11158 Enter_Overloaded_Entity
(S
);
11159 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
11160 Check_Overriding_Indicator
11161 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
11163 -- The Ghost policy in effect at the point of declaration of a parent
11164 -- subprogram and an overriding subprogram must match
11165 -- (SPARK RM 6.9(17)).
11167 Check_Ghost_Overriding
(S
, Overridden_Subp
);
11169 -- Overloading is not allowed in SPARK, except for operators
11171 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
11172 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
11173 Check_SPARK_05_Restriction
11174 ("overloading not allowed with entity#", S
);
11177 -- If S is a derived operation for an untagged type then by
11178 -- definition it's not a dispatching operation (even if the parent
11179 -- operation was dispatching), so Check_Dispatching_Operation is not
11180 -- called in that case.
11182 if No
(Derived_Type
)
11183 or else Is_Tagged_Type
(Derived_Type
)
11185 Check_Dispatching_Operation
(S
, Empty
);
11189 -- If this is a user-defined equality operator that is not a derived
11190 -- subprogram, create the corresponding inequality. If the operation is
11191 -- dispatching, the expansion is done elsewhere, and we do not create
11192 -- an explicit inequality operation.
11194 <<Check_Inequality
>>
11195 if Chars
(S
) = Name_Op_Eq
11196 and then Etype
(S
) = Standard_Boolean
11197 and then Present
(Parent
(S
))
11198 and then not Is_Dispatching_Operation
(S
)
11200 Make_Inequality_Operator
(S
);
11201 Check_Untagged_Equality
(S
);
11203 end New_Overloaded_Entity
;
11205 ---------------------
11206 -- Process_Formals --
11207 ---------------------
11209 procedure Process_Formals
11211 Related_Nod
: Node_Id
)
11213 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
11214 -- Determine whether an access type designates a type coming from a
11217 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
11218 -- Check whether the default has a class-wide type. After analysis the
11219 -- default has the type of the formal, so we must also check explicitly
11220 -- for an access attribute.
11222 ----------------------------------
11223 -- Designates_From_Limited_With --
11224 ----------------------------------
11226 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
11227 Desig
: Entity_Id
:= Typ
;
11230 if Is_Access_Type
(Desig
) then
11231 Desig
:= Directly_Designated_Type
(Desig
);
11234 if Is_Class_Wide_Type
(Desig
) then
11235 Desig
:= Root_Type
(Desig
);
11239 Ekind
(Desig
) = E_Incomplete_Type
11240 and then From_Limited_With
(Desig
);
11241 end Designates_From_Limited_With
;
11243 ---------------------------
11244 -- Is_Class_Wide_Default --
11245 ---------------------------
11247 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
11249 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
11250 or else (Nkind
(D
) = N_Attribute_Reference
11251 and then Attribute_Name
(D
) = Name_Access
11252 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
11253 end Is_Class_Wide_Default
;
11257 Context
: constant Node_Id
:= Parent
(Parent
(T
));
11259 Formal
: Entity_Id
;
11260 Formal_Type
: Entity_Id
;
11261 Param_Spec
: Node_Id
;
11264 Num_Out_Params
: Nat
:= 0;
11265 First_Out_Param
: Entity_Id
:= Empty
;
11266 -- Used for setting Is_Only_Out_Parameter
11268 -- Start of processing for Process_Formals
11271 -- In order to prevent premature use of the formals in the same formal
11272 -- part, the Ekind is left undefined until all default expressions are
11273 -- analyzed. The Ekind is established in a separate loop at the end.
11275 Param_Spec
:= First
(T
);
11276 while Present
(Param_Spec
) loop
11277 Formal
:= Defining_Identifier
(Param_Spec
);
11278 Set_Never_Set_In_Source
(Formal
, True);
11279 Enter_Name
(Formal
);
11281 -- Case of ordinary parameters
11283 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
11284 Find_Type
(Parameter_Type
(Param_Spec
));
11285 Ptype
:= Parameter_Type
(Param_Spec
);
11287 if Ptype
= Error
then
11291 Formal_Type
:= Entity
(Ptype
);
11293 if Is_Incomplete_Type
(Formal_Type
)
11295 (Is_Class_Wide_Type
(Formal_Type
)
11296 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
11298 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
11299 -- primitive operations, as long as their completion is
11300 -- in the same declarative part. If in the private part
11301 -- this means that the type cannot be a Taft-amendment type.
11302 -- Check is done on package exit. For access to subprograms,
11303 -- the use is legal for Taft-amendment types.
11305 -- Ada 2012: tagged incomplete types are allowed as generic
11306 -- formal types. They do not introduce dependencies and the
11307 -- corresponding generic subprogram does not have a delayed
11308 -- freeze, because it does not need a freeze node. However,
11309 -- it is still the case that untagged incomplete types cannot
11310 -- be Taft-amendment types and must be completed in private
11311 -- part, so the subprogram must appear in the list of private
11312 -- dependents of the type.
11314 if Is_Tagged_Type
(Formal_Type
)
11315 or else (Ada_Version
>= Ada_2012
11316 and then not From_Limited_With
(Formal_Type
)
11317 and then not Is_Generic_Type
(Formal_Type
))
11319 if Ekind
(Scope
(Current_Scope
)) = E_Package
11320 and then not Is_Generic_Type
(Formal_Type
)
11321 and then not Is_Class_Wide_Type
(Formal_Type
)
11324 (Parent
(T
), N_Access_Function_Definition
,
11325 N_Access_Procedure_Definition
)
11327 Append_Elmt
(Current_Scope
,
11328 Private_Dependents
(Base_Type
(Formal_Type
)));
11330 -- Freezing is delayed to ensure that Register_Prim
11331 -- will get called for this operation, which is needed
11332 -- in cases where static dispatch tables aren't built.
11333 -- (Note that the same is done for controlling access
11334 -- parameter cases in function Access_Definition.)
11336 if not Is_Thunk
(Current_Scope
) then
11337 Set_Has_Delayed_Freeze
(Current_Scope
);
11342 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
11343 N_Access_Procedure_Definition
)
11345 -- AI05-0151: Tagged incomplete types are allowed in all
11346 -- formal parts. Untagged incomplete types are not allowed
11347 -- in bodies. Limited views of either kind are not allowed
11348 -- if there is no place at which the non-limited view can
11349 -- become available.
11351 -- Incomplete formal untagged types are not allowed in
11352 -- subprogram bodies (but are legal in their declarations).
11353 -- This excludes bodies created for null procedures, which
11354 -- are basic declarations.
11356 if Is_Generic_Type
(Formal_Type
)
11357 and then not Is_Tagged_Type
(Formal_Type
)
11358 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
11361 ("invalid use of formal incomplete type", Param_Spec
);
11363 elsif Ada_Version
>= Ada_2012
then
11364 if Is_Tagged_Type
(Formal_Type
)
11365 and then (not From_Limited_With
(Formal_Type
)
11366 or else not In_Package_Body
)
11370 elsif Nkind_In
(Context
, N_Accept_Statement
,
11371 N_Accept_Alternative
,
11373 or else (Nkind
(Context
) = N_Subprogram_Body
11374 and then Comes_From_Source
(Context
))
11377 ("invalid use of untagged incomplete type &",
11378 Ptype
, Formal_Type
);
11383 ("invalid use of incomplete type&",
11384 Param_Spec
, Formal_Type
);
11386 -- Further checks on the legality of incomplete types
11387 -- in formal parts are delayed until the freeze point
11388 -- of the enclosing subprogram or access to subprogram.
11392 elsif Ekind
(Formal_Type
) = E_Void
then
11394 ("premature use of&",
11395 Parameter_Type
(Param_Spec
), Formal_Type
);
11398 -- Ada 2012 (AI-142): Handle aliased parameters
11400 if Ada_Version
>= Ada_2012
11401 and then Aliased_Present
(Param_Spec
)
11403 Set_Is_Aliased
(Formal
);
11406 -- Ada 2005 (AI-231): Create and decorate an internal subtype
11407 -- declaration corresponding to the null-excluding type of the
11408 -- formal in the enclosing scope. Finally, replace the parameter
11409 -- type of the formal with the internal subtype.
11411 if Ada_Version
>= Ada_2005
11412 and then Null_Exclusion_Present
(Param_Spec
)
11414 if not Is_Access_Type
(Formal_Type
) then
11416 ("`NOT NULL` allowed only for an access type", Param_Spec
);
11419 if Can_Never_Be_Null
(Formal_Type
)
11420 and then Comes_From_Source
(Related_Nod
)
11423 ("`NOT NULL` not allowed (& already excludes null)",
11424 Param_Spec
, Formal_Type
);
11428 Create_Null_Excluding_Itype
11430 Related_Nod
=> Related_Nod
,
11431 Scope_Id
=> Scope
(Current_Scope
));
11433 -- If the designated type of the itype is an itype that is
11434 -- not frozen yet, we set the Has_Delayed_Freeze attribute
11435 -- on the access subtype, to prevent order-of-elaboration
11436 -- issues in the backend.
11439 -- type T is access procedure;
11440 -- procedure Op (O : not null T);
11442 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
11444 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
11446 Set_Has_Delayed_Freeze
(Formal_Type
);
11451 -- An access formal type
11455 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
11457 -- No need to continue if we already notified errors
11459 if not Present
(Formal_Type
) then
11463 -- Ada 2005 (AI-254)
11466 AD
: constant Node_Id
:=
11467 Access_To_Subprogram_Definition
11468 (Parameter_Type
(Param_Spec
));
11470 if Present
(AD
) and then Protected_Present
(AD
) then
11472 Replace_Anonymous_Access_To_Protected_Subprogram
11478 Set_Etype
(Formal
, Formal_Type
);
11480 -- Deal with default expression if present
11482 Default
:= Expression
(Param_Spec
);
11484 if Present
(Default
) then
11485 Check_SPARK_05_Restriction
11486 ("default expression is not allowed", Default
);
11488 if Out_Present
(Param_Spec
) then
11490 ("default initialization only allowed for IN parameters",
11494 -- Do the special preanalysis of the expression (see section on
11495 -- "Handling of Default Expressions" in the spec of package Sem).
11497 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
11499 -- An access to constant cannot be the default for
11500 -- an access parameter that is an access to variable.
11502 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11503 and then not Is_Access_Constant
(Formal_Type
)
11504 and then Is_Access_Type
(Etype
(Default
))
11505 and then Is_Access_Constant
(Etype
(Default
))
11508 ("formal that is access to variable cannot be initialized "
11509 & "with an access-to-constant expression", Default
);
11512 -- Check that the designated type of an access parameter's default
11513 -- is not a class-wide type unless the parameter's designated type
11514 -- is also class-wide.
11516 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11517 and then not Designates_From_Limited_With
(Formal_Type
)
11518 and then Is_Class_Wide_Default
(Default
)
11519 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
11522 ("access to class-wide expression not allowed here", Default
);
11525 -- Check incorrect use of dynamically tagged expressions
11527 if Is_Tagged_Type
(Formal_Type
) then
11528 Check_Dynamically_Tagged_Expression
11530 Typ
=> Formal_Type
,
11531 Related_Nod
=> Default
);
11535 -- Ada 2005 (AI-231): Static checks
11537 if Ada_Version
>= Ada_2005
11538 and then Is_Access_Type
(Etype
(Formal
))
11539 and then Can_Never_Be_Null
(Etype
(Formal
))
11541 Null_Exclusion_Static_Checks
(Param_Spec
);
11544 -- The following checks are relevant only when SPARK_Mode is on as
11545 -- these are not standard Ada legality rules.
11547 if SPARK_Mode
= On
then
11548 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
11550 -- A function cannot have a parameter of mode IN OUT or OUT
11553 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
11555 ("function cannot have parameter of mode `OUT` or "
11556 & "`IN OUT`", Formal
);
11559 -- A procedure cannot have an effectively volatile formal
11560 -- parameter of mode IN because it behaves as a constant
11561 -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4)
11563 elsif Ekind
(Scope
(Formal
)) = E_Procedure
11564 and then Ekind
(Formal
) = E_In_Parameter
11565 and then Is_Effectively_Volatile
(Formal
)
11568 ("formal parameter of mode `IN` cannot be volatile", Formal
);
11576 -- If this is the formal part of a function specification, analyze the
11577 -- subtype mark in the context where the formals are visible but not
11578 -- yet usable, and may hide outer homographs.
11580 if Nkind
(Related_Nod
) = N_Function_Specification
then
11581 Analyze_Return_Type
(Related_Nod
);
11584 -- Now set the kind (mode) of each formal
11586 Param_Spec
:= First
(T
);
11587 while Present
(Param_Spec
) loop
11588 Formal
:= Defining_Identifier
(Param_Spec
);
11589 Set_Formal_Mode
(Formal
);
11591 if Ekind
(Formal
) = E_In_Parameter
then
11592 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
11594 if Present
(Expression
(Param_Spec
)) then
11595 Default
:= Expression
(Param_Spec
);
11597 if Is_Scalar_Type
(Etype
(Default
)) then
11598 if Nkind
(Parameter_Type
(Param_Spec
)) /=
11599 N_Access_Definition
11601 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
11605 (Related_Nod
, Parameter_Type
(Param_Spec
));
11608 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
11612 elsif Ekind
(Formal
) = E_Out_Parameter
then
11613 Num_Out_Params
:= Num_Out_Params
+ 1;
11615 if Num_Out_Params
= 1 then
11616 First_Out_Param
:= Formal
;
11619 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
11620 Num_Out_Params
:= Num_Out_Params
+ 1;
11623 -- Skip remaining processing if formal type was in error
11625 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
11626 goto Next_Parameter
;
11629 -- Force call by reference if aliased
11632 Conv
: constant Convention_Id
:= Convention
(Etype
(Formal
));
11634 if Is_Aliased
(Formal
) then
11635 Set_Mechanism
(Formal
, By_Reference
);
11637 -- Warn if user asked this to be passed by copy
11639 if Conv
= Convention_Ada_Pass_By_Copy
then
11641 ("cannot pass aliased parameter & by copy??", Formal
);
11644 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
11646 elsif Conv
= Convention_Ada_Pass_By_Copy
then
11647 Set_Mechanism
(Formal
, By_Copy
);
11649 elsif Conv
= Convention_Ada_Pass_By_Reference
then
11650 Set_Mechanism
(Formal
, By_Reference
);
11658 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
11659 Set_Is_Only_Out_Parameter
(First_Out_Param
);
11661 end Process_Formals
;
11663 ----------------------------
11664 -- Reference_Body_Formals --
11665 ----------------------------
11667 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
11672 if Error_Posted
(Spec
) then
11676 -- Iterate over both lists. They may be of different lengths if the two
11677 -- specs are not conformant.
11679 Fs
:= First_Formal
(Spec
);
11680 Fb
:= First_Formal
(Bod
);
11681 while Present
(Fs
) and then Present
(Fb
) loop
11682 Generate_Reference
(Fs
, Fb
, 'b');
11684 if Style_Check
then
11685 Style
.Check_Identifier
(Fb
, Fs
);
11688 Set_Spec_Entity
(Fb
, Fs
);
11689 Set_Referenced
(Fs
, False);
11693 end Reference_Body_Formals
;
11695 -------------------------
11696 -- Set_Actual_Subtypes --
11697 -------------------------
11699 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
11701 Formal
: Entity_Id
;
11703 First_Stmt
: Node_Id
:= Empty
;
11704 AS_Needed
: Boolean;
11707 -- If this is an empty initialization procedure, no need to create
11708 -- actual subtypes (small optimization).
11710 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
11713 -- Within a predicate function we do not want to generate local
11714 -- subtypes that may generate nested predicate functions.
11716 elsif Is_Subprogram
(Subp
) and then Is_Predicate_Function
(Subp
) then
11720 -- The subtype declarations may freeze the formals. The body generated
11721 -- for an expression function is not a freeze point, so do not emit
11722 -- these declarations (small loss of efficiency in rare cases).
11724 if Nkind
(N
) = N_Subprogram_Body
11725 and then Was_Expression_Function
(N
)
11730 Formal
:= First_Formal
(Subp
);
11731 while Present
(Formal
) loop
11732 T
:= Etype
(Formal
);
11734 -- We never need an actual subtype for a constrained formal
11736 if Is_Constrained
(T
) then
11737 AS_Needed
:= False;
11739 -- If we have unknown discriminants, then we do not need an actual
11740 -- subtype, or more accurately we cannot figure it out. Note that
11741 -- all class-wide types have unknown discriminants.
11743 elsif Has_Unknown_Discriminants
(T
) then
11744 AS_Needed
:= False;
11746 -- At this stage we have an unconstrained type that may need an
11747 -- actual subtype. For sure the actual subtype is needed if we have
11748 -- an unconstrained array type. However, in an instance, the type
11749 -- may appear as a subtype of the full view, while the actual is
11750 -- in fact private (in which case no actual subtype is needed) so
11751 -- check the kind of the base type.
11753 elsif Is_Array_Type
(Base_Type
(T
)) then
11756 -- The only other case needing an actual subtype is an unconstrained
11757 -- record type which is an IN parameter (we cannot generate actual
11758 -- subtypes for the OUT or IN OUT case, since an assignment can
11759 -- change the discriminant values. However we exclude the case of
11760 -- initialization procedures, since discriminants are handled very
11761 -- specially in this context, see the section entitled "Handling of
11762 -- Discriminants" in Einfo.
11764 -- We also exclude the case of Discrim_SO_Functions (functions used
11765 -- in front-end layout mode for size/offset values), since in such
11766 -- functions only discriminants are referenced, and not only are such
11767 -- subtypes not needed, but they cannot always be generated, because
11768 -- of order of elaboration issues.
11770 elsif Is_Record_Type
(T
)
11771 and then Ekind
(Formal
) = E_In_Parameter
11772 and then Chars
(Formal
) /= Name_uInit
11773 and then not Is_Unchecked_Union
(T
)
11774 and then not Is_Discrim_SO_Function
(Subp
)
11778 -- All other cases do not need an actual subtype
11781 AS_Needed
:= False;
11784 -- Generate actual subtypes for unconstrained arrays and
11785 -- unconstrained discriminated records.
11788 if Nkind
(N
) = N_Accept_Statement
then
11790 -- If expansion is active, the formal is replaced by a local
11791 -- variable that renames the corresponding entry of the
11792 -- parameter block, and it is this local variable that may
11793 -- require an actual subtype.
11795 if Expander_Active
then
11796 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
11798 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11801 if Present
(Handled_Statement_Sequence
(N
)) then
11803 First
(Statements
(Handled_Statement_Sequence
(N
)));
11804 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
11805 Mark_Rewrite_Insertion
(Decl
);
11807 -- If the accept statement has no body, there will be no
11808 -- reference to the actuals, so no need to compute actual
11815 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11816 Prepend
(Decl
, Declarations
(N
));
11817 Mark_Rewrite_Insertion
(Decl
);
11820 -- The declaration uses the bounds of an existing object, and
11821 -- therefore needs no constraint checks.
11823 Analyze
(Decl
, Suppress
=> All_Checks
);
11824 Set_Is_Actual_Subtype
(Defining_Identifier
(Decl
));
11826 -- We need to freeze manually the generated type when it is
11827 -- inserted anywhere else than in a declarative part.
11829 if Present
(First_Stmt
) then
11830 Insert_List_Before_And_Analyze
(First_Stmt
,
11831 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11833 -- Ditto if the type has a dynamic predicate, because the
11834 -- generated function will mention the actual subtype. The
11835 -- predicate may come from an explicit aspect of be inherited.
11837 elsif Has_Predicates
(T
) then
11838 Insert_List_Before_And_Analyze
(Decl
,
11839 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11842 if Nkind
(N
) = N_Accept_Statement
11843 and then Expander_Active
11845 Set_Actual_Subtype
(Renamed_Object
(Formal
),
11846 Defining_Identifier
(Decl
));
11848 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
11852 Next_Formal
(Formal
);
11854 end Set_Actual_Subtypes
;
11856 ---------------------
11857 -- Set_Formal_Mode --
11858 ---------------------
11860 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
11861 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
11862 Id
: constant Entity_Id
:= Scope
(Formal_Id
);
11865 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
11866 -- since we ensure that corresponding actuals are always valid at the
11867 -- point of the call.
11869 if Out_Present
(Spec
) then
11870 if Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
11871 or else Is_Subprogram_Or_Generic_Subprogram
(Id
)
11873 Set_Has_Out_Or_In_Out_Parameter
(Id
, True);
11876 if Ekind_In
(Id
, E_Function
, E_Generic_Function
) then
11878 -- [IN] OUT parameters allowed for functions in Ada 2012
11880 if Ada_Version
>= Ada_2012
then
11882 -- Even in Ada 2012 operators can only have IN parameters
11884 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
11885 Error_Msg_N
("operators can only have IN parameters", Spec
);
11888 if In_Present
(Spec
) then
11889 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11891 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11894 -- But not in earlier versions of Ada
11897 Error_Msg_N
("functions can only have IN parameters", Spec
);
11898 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11901 elsif In_Present
(Spec
) then
11902 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11905 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11906 Set_Never_Set_In_Source
(Formal_Id
, True);
11907 Set_Is_True_Constant
(Formal_Id
, False);
11908 Set_Current_Value
(Formal_Id
, Empty
);
11912 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11915 -- Set Is_Known_Non_Null for access parameters since the language
11916 -- guarantees that access parameters are always non-null. We also set
11917 -- Can_Never_Be_Null, since there is no way to change the value.
11919 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
11921 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
11922 -- null; In Ada 2005, only if then null_exclusion is explicit.
11924 if Ada_Version
< Ada_2005
11925 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
11927 Set_Is_Known_Non_Null
(Formal_Id
);
11928 Set_Can_Never_Be_Null
(Formal_Id
);
11931 -- Ada 2005 (AI-231): Null-exclusion access subtype
11933 elsif Is_Access_Type
(Etype
(Formal_Id
))
11934 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
11936 Set_Is_Known_Non_Null
(Formal_Id
);
11938 -- We can also set Can_Never_Be_Null (thus preventing some junk
11939 -- access checks) for the case of an IN parameter, which cannot
11940 -- be changed, or for an IN OUT parameter, which can be changed but
11941 -- not to a null value. But for an OUT parameter, the initial value
11942 -- passed in can be null, so we can't set this flag in that case.
11944 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
11945 Set_Can_Never_Be_Null
(Formal_Id
);
11949 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
11950 Set_Formal_Validity
(Formal_Id
);
11951 end Set_Formal_Mode
;
11953 -------------------------
11954 -- Set_Formal_Validity --
11955 -------------------------
11957 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
11959 -- If no validity checking, then we cannot assume anything about the
11960 -- validity of parameters, since we do not know there is any checking
11961 -- of the validity on the call side.
11963 if not Validity_Checks_On
then
11966 -- If validity checking for parameters is enabled, this means we are
11967 -- not supposed to make any assumptions about argument values.
11969 elsif Validity_Check_Parameters
then
11972 -- If we are checking in parameters, we will assume that the caller is
11973 -- also checking parameters, so we can assume the parameter is valid.
11975 elsif Ekind
(Formal_Id
) = E_In_Parameter
11976 and then Validity_Check_In_Params
11978 Set_Is_Known_Valid
(Formal_Id
, True);
11980 -- Similar treatment for IN OUT parameters
11982 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
11983 and then Validity_Check_In_Out_Params
11985 Set_Is_Known_Valid
(Formal_Id
, True);
11987 end Set_Formal_Validity
;
11989 ------------------------
11990 -- Subtype_Conformant --
11991 ------------------------
11993 function Subtype_Conformant
11994 (New_Id
: Entity_Id
;
11995 Old_Id
: Entity_Id
;
11996 Skip_Controlling_Formals
: Boolean := False) return Boolean
12000 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
12001 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12003 end Subtype_Conformant
;
12005 ---------------------
12006 -- Type_Conformant --
12007 ---------------------
12009 function Type_Conformant
12010 (New_Id
: Entity_Id
;
12011 Old_Id
: Entity_Id
;
12012 Skip_Controlling_Formals
: Boolean := False) return Boolean
12016 May_Hide_Profile
:= False;
12018 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
12019 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12021 end Type_Conformant
;
12023 -------------------------------
12024 -- Valid_Operator_Definition --
12025 -------------------------------
12027 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
12030 Id
: constant Name_Id
:= Chars
(Designator
);
12034 F
:= First_Formal
(Designator
);
12035 while Present
(F
) loop
12038 if Present
(Default_Value
(F
)) then
12040 ("default values not allowed for operator parameters",
12043 -- For function instantiations that are operators, we must check
12044 -- separately that the corresponding generic only has in-parameters.
12045 -- For subprogram declarations this is done in Set_Formal_Mode. Such
12046 -- an error could not arise in earlier versions of the language.
12048 elsif Ekind
(F
) /= E_In_Parameter
then
12049 Error_Msg_N
("operators can only have IN parameters", F
);
12055 -- Verify that user-defined operators have proper number of arguments
12056 -- First case of operators which can only be unary
12058 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
12061 -- Case of operators which can be unary or binary
12063 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
12064 N_OK
:= (N
in 1 .. 2);
12066 -- All other operators can only be binary
12074 ("incorrect number of arguments for operator", Designator
);
12078 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
12079 and then not Is_Intrinsic_Subprogram
(Designator
)
12082 ("explicit definition of inequality not allowed", Designator
);
12084 end Valid_Operator_Definition
;