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 ---------------------
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
1195 -- Defend against previous errors
1197 and then Nkind
(Expr
) /= N_Empty
1198 and then Present
(Etype
(Expr
))
1200 -- Apply constraint check. Note that this is done before the implicit
1201 -- conversion of the expression done for anonymous access types to
1202 -- ensure correct generation of the null-excluding check associated
1203 -- with null-excluding expressions found in return statements.
1205 Apply_Constraint_Check
(Expr
, R_Type
);
1207 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
1208 -- type, apply an implicit conversion of the expression to that type
1209 -- to force appropriate static and run-time accessibility checks.
1211 if Ada_Version
>= Ada_2005
1212 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
1214 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
1215 Analyze_And_Resolve
(Expr
, R_Type
);
1217 -- If this is a local anonymous access to subprogram, the
1218 -- accessibility check can be applied statically. The return is
1219 -- illegal if the access type of the return expression is declared
1220 -- inside of the subprogram (except if it is the subtype indication
1221 -- of an extended return statement).
1223 elsif Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
then
1224 if not Comes_From_Source
(Current_Scope
)
1225 or else Ekind
(Current_Scope
) = E_Return_Statement
1230 Scope_Depth
(Scope
(Etype
(Expr
))) >= Scope_Depth
(Scope_Id
)
1232 Error_Msg_N
("cannot return local access to subprogram", N
);
1235 -- The expression cannot be of a formal incomplete type
1237 elsif Ekind
(Etype
(Expr
)) = E_Incomplete_Type
1238 and then Is_Generic_Type
(Etype
(Expr
))
1241 ("cannot return expression of a formal incomplete type", N
);
1244 -- If the result type is class-wide, then check that the return
1245 -- expression's type is not declared at a deeper level than the
1246 -- function (RM05-6.5(5.6/2)).
1248 if Ada_Version
>= Ada_2005
1249 and then Is_Class_Wide_Type
(R_Type
)
1251 if Type_Access_Level
(Etype
(Expr
)) >
1252 Subprogram_Access_Level
(Scope_Id
)
1255 ("level of return expression type is deeper than "
1256 & "class-wide function!", Expr
);
1260 -- Check incorrect use of dynamically tagged expression
1262 if Is_Tagged_Type
(R_Type
) then
1263 Check_Dynamically_Tagged_Expression
1269 -- ??? A real run-time accessibility check is needed in cases
1270 -- involving dereferences of access parameters. For now we just
1271 -- check the static cases.
1273 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
1274 and then Is_Limited_View
(Etype
(Scope_Id
))
1275 and then Object_Access_Level
(Expr
) >
1276 Subprogram_Access_Level
(Scope_Id
)
1278 -- Suppress the message in a generic, where the rewriting
1281 if Inside_A_Generic
then
1286 Make_Raise_Program_Error
(Loc
,
1287 Reason
=> PE_Accessibility_Check_Failed
));
1290 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1291 Error_Msg_N
("cannot return a local value by reference<<", N
);
1292 Error_Msg_NE
("\& [<<", N
, Standard_Program_Error
);
1296 if Known_Null
(Expr
)
1297 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
1298 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
1300 Apply_Compile_Time_Constraint_Error
1302 Msg
=> "(Ada 2005) null not allowed for "
1303 & "null-excluding return??",
1304 Reason
=> CE_Null_Not_Allowed
);
1307 -- RM 6.5 (5.4/3): accessibility checks also apply if the return object
1308 -- has no initializing expression.
1310 elsif Ada_Version
> Ada_2005
and then Is_Class_Wide_Type
(R_Type
) then
1311 if Type_Access_Level
(Etype
(Defining_Identifier
(Obj_Decl
))) >
1312 Subprogram_Access_Level
(Scope_Id
)
1315 ("level of return expression type is deeper than "
1316 & "class-wide function!", Obj_Decl
);
1319 end Analyze_Function_Return
;
1321 -------------------------------------
1322 -- Analyze_Generic_Subprogram_Body --
1323 -------------------------------------
1325 procedure Analyze_Generic_Subprogram_Body
1329 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
1330 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
1331 Body_Id
: Entity_Id
;
1336 -- Copy body and disable expansion while analyzing the generic For a
1337 -- stub, do not copy the stub (which would load the proper body), this
1338 -- will be done when the proper body is analyzed.
1340 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
1341 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
1344 -- Once the contents of the generic copy and the template are
1345 -- swapped, do the same for their respective aspect specifications.
1347 Exchange_Aspects
(N
, New_N
);
1349 -- Collect all contract-related source pragmas found within the
1350 -- template and attach them to the contract of the subprogram body.
1351 -- This contract is used in the capture of global references within
1354 Create_Generic_Contract
(N
);
1359 Spec
:= Specification
(N
);
1361 -- Within the body of the generic, the subprogram is callable, and
1362 -- behaves like the corresponding non-generic unit.
1364 Body_Id
:= Defining_Entity
(Spec
);
1366 if Kind
= E_Generic_Procedure
1367 and then Nkind
(Spec
) /= N_Procedure_Specification
1369 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
1372 elsif Kind
= E_Generic_Function
1373 and then Nkind
(Spec
) /= N_Function_Specification
1375 Error_Msg_N
("invalid body for generic function ", Body_Id
);
1379 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
1381 if Has_Completion
(Gen_Id
)
1382 and then Nkind
(Parent
(N
)) /= N_Subunit
1384 Error_Msg_N
("duplicate generic body", N
);
1387 Set_Has_Completion
(Gen_Id
);
1390 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1391 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
1393 Set_Corresponding_Spec
(N
, Gen_Id
);
1396 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1397 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
1400 -- Make generic parameters immediately visible in the body. They are
1401 -- needed to process the formals declarations. Then make the formals
1402 -- visible in a separate step.
1404 Push_Scope
(Gen_Id
);
1408 First_Ent
: Entity_Id
;
1411 First_Ent
:= First_Entity
(Gen_Id
);
1414 while Present
(E
) and then not Is_Formal
(E
) loop
1419 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
1421 -- Now generic formals are visible, and the specification can be
1422 -- analyzed, for subsequent conformance check.
1424 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
1426 -- Make formal parameters visible
1430 -- E is the first formal parameter, we loop through the formals
1431 -- installing them so that they will be visible.
1433 Set_First_Entity
(Gen_Id
, E
);
1434 while Present
(E
) loop
1440 -- Visible generic entity is callable within its own body
1442 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
1443 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
1444 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
1445 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
1446 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
1448 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
1450 if Nkind
(N
) = N_Subprogram_Body_Stub
then
1452 -- No body to analyze, so restore state of generic unit
1454 Set_Ekind
(Gen_Id
, Kind
);
1455 Set_Ekind
(Body_Id
, Kind
);
1457 if Present
(First_Ent
) then
1458 Set_First_Entity
(Gen_Id
, First_Ent
);
1465 -- If this is a compilation unit, it must be made visible explicitly,
1466 -- because the compilation of the declaration, unlike other library
1467 -- unit declarations, does not. If it is not a unit, the following
1468 -- is redundant but harmless.
1470 Set_Is_Immediately_Visible
(Gen_Id
);
1471 Reference_Body_Formals
(Gen_Id
, Body_Id
);
1473 if Is_Child_Unit
(Gen_Id
) then
1474 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
1477 Set_Actual_Subtypes
(N
, Current_Scope
);
1479 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
1480 Set_SPARK_Pragma_Inherited
(Body_Id
);
1482 -- Analyze any aspect specifications that appear on the generic
1485 if Has_Aspects
(N
) then
1486 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
1489 Analyze_Declarations
(Declarations
(N
));
1492 -- Process the contract of the subprogram body after all declarations
1493 -- have been analyzed. This ensures that any contract-related pragmas
1494 -- are available through the N_Contract node of the body.
1496 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
1498 Analyze
(Handled_Statement_Sequence
(N
));
1499 Save_Global_References
(Original_Node
(N
));
1501 -- Prior to exiting the scope, include generic formals again (if any
1502 -- are present) in the set of local entities.
1504 if Present
(First_Ent
) then
1505 Set_First_Entity
(Gen_Id
, First_Ent
);
1508 Check_References
(Gen_Id
);
1511 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1512 Update_Use_Clause_Chain
;
1514 Check_Subprogram_Order
(N
);
1516 -- Outside of its body, unit is generic again
1518 Set_Ekind
(Gen_Id
, Kind
);
1519 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1522 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1526 end Analyze_Generic_Subprogram_Body
;
1528 ----------------------------
1529 -- Analyze_Null_Procedure --
1530 ----------------------------
1532 procedure Analyze_Null_Procedure
1534 Is_Completion
: out Boolean)
1536 Loc
: constant Source_Ptr
:= Sloc
(N
);
1537 Spec
: constant Node_Id
:= Specification
(N
);
1538 Designator
: Entity_Id
;
1540 Null_Body
: Node_Id
:= Empty
;
1541 Null_Stmt
: Node_Id
:= Null_Statement
(Spec
);
1545 -- Capture the profile of the null procedure before analysis, for
1546 -- expansion at the freeze point and at each point of call. The body is
1547 -- used if the procedure has preconditions, or if it is a completion. In
1548 -- the first case the body is analyzed at the freeze point, in the other
1549 -- it replaces the null procedure declaration.
1551 -- For a null procedure that comes from source, a NULL statement is
1552 -- provided by the parser, which carries the source location of the
1553 -- NULL keyword, and has Comes_From_Source set. For a null procedure
1554 -- from expansion, create one now.
1556 if No
(Null_Stmt
) then
1557 Null_Stmt
:= Make_Null_Statement
(Loc
);
1561 Make_Subprogram_Body
(Loc
,
1562 Specification
=> New_Copy_Tree
(Spec
),
1563 Declarations
=> New_List
,
1564 Handled_Statement_Sequence
=>
1565 Make_Handled_Sequence_Of_Statements
(Loc
,
1566 Statements
=> New_List
(Null_Stmt
)));
1568 -- Create new entities for body and formals
1570 Set_Defining_Unit_Name
(Specification
(Null_Body
),
1571 Make_Defining_Identifier
1572 (Sloc
(Defining_Entity
(N
)),
1573 Chars
(Defining_Entity
(N
))));
1575 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1576 while Present
(Form
) loop
1577 Set_Defining_Identifier
(Form
,
1578 Make_Defining_Identifier
1579 (Sloc
(Defining_Identifier
(Form
)),
1580 Chars
(Defining_Identifier
(Form
))));
1584 -- Determine whether the null procedure may be a completion of a generic
1585 -- suprogram, in which case we use the new null body as the completion
1586 -- and set minimal semantic information on the original declaration,
1587 -- which is rewritten as a null statement.
1589 Prev
:= Current_Entity_In_Scope
(Defining_Entity
(Spec
));
1591 if Present
(Prev
) and then Is_Generic_Subprogram
(Prev
) then
1592 Insert_Before
(N
, Null_Body
);
1593 Set_Ekind
(Defining_Entity
(N
), Ekind
(Prev
));
1595 Rewrite
(N
, Make_Null_Statement
(Loc
));
1596 Analyze_Generic_Subprogram_Body
(Null_Body
, Prev
);
1597 Is_Completion
:= True;
1601 -- Resolve the types of the formals now, because the freeze point may
1602 -- appear in a different context, e.g. an instantiation.
1604 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
1605 while Present
(Form
) loop
1606 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
1607 Find_Type
(Parameter_Type
(Form
));
1609 elsif No
(Access_To_Subprogram_Definition
1610 (Parameter_Type
(Form
)))
1612 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
1614 -- The case of a null procedure with a formal that is an
1615 -- access-to-subprogram type, and that is used as an actual
1616 -- in an instantiation is left to the enthusiastic reader.
1626 -- If there are previous overloadable entities with the same name, check
1627 -- whether any of them is completed by the null procedure.
1629 if Present
(Prev
) and then Is_Overloadable
(Prev
) then
1630 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1631 Prev
:= Find_Corresponding_Spec
(N
);
1634 if No
(Prev
) or else not Comes_From_Source
(Prev
) then
1635 Designator
:= Analyze_Subprogram_Specification
(Spec
);
1636 Set_Has_Completion
(Designator
);
1638 -- Signal to caller that this is a procedure declaration
1640 Is_Completion
:= False;
1642 -- Null procedures are always inlined, but generic formal subprograms
1643 -- which appear as such in the internal instance of formal packages,
1644 -- need no completion and are not marked Inline.
1647 and then Nkind
(N
) /= N_Formal_Concrete_Subprogram_Declaration
1649 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
1650 Set_Body_To_Inline
(N
, Null_Body
);
1651 Set_Is_Inlined
(Designator
);
1655 -- The null procedure is a completion. We unconditionally rewrite
1656 -- this as a null body (even if expansion is not active), because
1657 -- there are various error checks that are applied on this body
1658 -- when it is analyzed (e.g. correct aspect placement).
1660 if Has_Completion
(Prev
) then
1661 Error_Msg_Sloc
:= Sloc
(Prev
);
1662 Error_Msg_NE
("duplicate body for & declared#", N
, Prev
);
1665 Check_Previous_Null_Procedure
(N
, Prev
);
1667 Is_Completion
:= True;
1668 Rewrite
(N
, Null_Body
);
1671 end Analyze_Null_Procedure
;
1673 -----------------------------
1674 -- Analyze_Operator_Symbol --
1675 -----------------------------
1677 -- An operator symbol such as "+" or "and" may appear in context where the
1678 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1679 -- is just a string, as in (conjunction = "or"). In these cases the parser
1680 -- generates this node, and the semantics does the disambiguation. Other
1681 -- such case are actuals in an instantiation, the generic unit in an
1682 -- instantiation, and pragma arguments.
1684 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1685 Par
: constant Node_Id
:= Parent
(N
);
1688 if (Nkind
(Par
) = N_Function_Call
and then N
= Name
(Par
))
1689 or else Nkind
(Par
) = N_Function_Instantiation
1690 or else (Nkind
(Par
) = N_Indexed_Component
and then N
= Prefix
(Par
))
1691 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1692 and then not Is_Pragma_String_Literal
(Par
))
1693 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1694 or else (Nkind
(Par
) = N_Attribute_Reference
1695 and then Attribute_Name
(Par
) /= Name_Value
)
1697 Find_Direct_Name
(N
);
1700 Change_Operator_Symbol_To_String_Literal
(N
);
1703 end Analyze_Operator_Symbol
;
1705 -----------------------------------
1706 -- Analyze_Parameter_Association --
1707 -----------------------------------
1709 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1711 Analyze
(Explicit_Actual_Parameter
(N
));
1712 end Analyze_Parameter_Association
;
1714 ----------------------------
1715 -- Analyze_Procedure_Call --
1716 ----------------------------
1718 -- WARNING: This routine manages Ghost regions. Return statements must be
1719 -- replaced by gotos which jump to the end of the routine and restore the
1722 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1723 procedure Analyze_Call_And_Resolve
;
1724 -- Do Analyze and Resolve calls for procedure call. At the end, check
1725 -- for illegal order dependence.
1726 -- ??? where is the check for illegal order dependencies?
1728 ------------------------------
1729 -- Analyze_Call_And_Resolve --
1730 ------------------------------
1732 procedure Analyze_Call_And_Resolve
is
1734 if Nkind
(N
) = N_Procedure_Call_Statement
then
1736 Resolve
(N
, Standard_Void_Type
);
1740 end Analyze_Call_And_Resolve
;
1744 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1745 Loc
: constant Source_Ptr
:= Sloc
(N
);
1746 P
: constant Node_Id
:= Name
(N
);
1748 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1749 -- Save the Ghost mode to restore on exit
1754 -- Start of processing for Analyze_Procedure_Call
1757 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1758 -- a procedure call or an entry call. The prefix may denote an access
1759 -- to subprogram type, in which case an implicit dereference applies.
1760 -- If the prefix is an indexed component (without implicit dereference)
1761 -- then the construct denotes a call to a member of an entire family.
1762 -- If the prefix is a simple name, it may still denote a call to a
1763 -- parameterless member of an entry family. Resolution of these various
1764 -- interpretations is delicate.
1766 -- Do not analyze machine code statements to avoid rejecting them in
1769 if CodePeer_Mode
and then Nkind
(P
) = N_Qualified_Expression
then
1770 Set_Etype
(P
, Standard_Void_Type
);
1775 -- If this is a call of the form Obj.Op, the call may have been analyzed
1776 -- and possibly rewritten into a block, in which case we are done.
1778 if Analyzed
(N
) then
1781 -- If there is an error analyzing the name (which may have been
1782 -- rewritten if the original call was in prefix notation) then error
1783 -- has been emitted already, mark node and return.
1785 elsif Error_Posted
(N
) or else Etype
(Name
(N
)) = Any_Type
then
1786 Set_Etype
(N
, Any_Type
);
1790 -- A procedure call is Ghost when its name denotes a Ghost procedure.
1791 -- Set the mode now to ensure that any nodes generated during analysis
1792 -- and expansion are properly marked as Ghost.
1794 Mark_And_Set_Ghost_Procedure_Call
(N
);
1796 -- Otherwise analyze the parameters
1798 if Present
(Actuals
) then
1799 Actual
:= First
(Actuals
);
1801 while Present
(Actual
) loop
1803 Check_Parameterless_Call
(Actual
);
1808 -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls
1810 if Nkind
(P
) = N_Attribute_Reference
1811 and then Nam_In
(Attribute_Name
(P
), Name_Elab_Spec
,
1813 Name_Elab_Subp_Body
)
1815 if Present
(Actuals
) then
1817 ("no parameters allowed for this call", First
(Actuals
));
1821 Set_Etype
(N
, Standard_Void_Type
);
1824 elsif Is_Entity_Name
(P
)
1825 and then Is_Record_Type
(Etype
(Entity
(P
)))
1826 and then Remote_AST_I_Dereference
(P
)
1830 elsif Is_Entity_Name
(P
)
1831 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1833 if Is_Access_Type
(Etype
(P
))
1834 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1835 and then No
(Actuals
)
1836 and then Comes_From_Source
(N
)
1838 Error_Msg_N
("missing explicit dereference in call", N
);
1841 Analyze_Call_And_Resolve
;
1843 -- If the prefix is the simple name of an entry family, this is a
1844 -- parameterless call from within the task body itself.
1846 elsif Is_Entity_Name
(P
)
1847 and then Nkind
(P
) = N_Identifier
1848 and then Ekind
(Entity
(P
)) = E_Entry_Family
1849 and then Present
(Actuals
)
1850 and then No
(Next
(First
(Actuals
)))
1852 -- Can be call to parameterless entry family. What appears to be the
1853 -- sole argument is in fact the entry index. Rewrite prefix of node
1854 -- accordingly. Source representation is unchanged by this
1858 Make_Indexed_Component
(Loc
,
1860 Make_Selected_Component
(Loc
,
1861 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1862 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1863 Expressions
=> Actuals
);
1864 Set_Name
(N
, New_N
);
1865 Set_Etype
(New_N
, Standard_Void_Type
);
1866 Set_Parameter_Associations
(N
, No_List
);
1867 Analyze_Call_And_Resolve
;
1869 elsif Nkind
(P
) = N_Explicit_Dereference
then
1870 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1871 Analyze_Call_And_Resolve
;
1873 Error_Msg_N
("expect access to procedure in call", P
);
1876 -- The name can be a selected component or an indexed component that
1877 -- yields an access to subprogram. Such a prefix is legal if the call
1878 -- has parameter associations.
1880 elsif Is_Access_Type
(Etype
(P
))
1881 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1883 if Present
(Actuals
) then
1884 Analyze_Call_And_Resolve
;
1886 Error_Msg_N
("missing explicit dereference in call ", N
);
1889 -- If not an access to subprogram, then the prefix must resolve to the
1890 -- name of an entry, entry family, or protected operation.
1892 -- For the case of a simple entry call, P is a selected component where
1893 -- the prefix is the task and the selector name is the entry. A call to
1894 -- a protected procedure will have the same syntax. If the protected
1895 -- object contains overloaded operations, the entity may appear as a
1896 -- function, the context will select the operation whose type is Void.
1898 elsif Nkind
(P
) = N_Selected_Component
1899 and then Ekind_In
(Entity
(Selector_Name
(P
)), E_Entry
,
1903 -- When front-end inlining is enabled, as with SPARK_Mode, a call
1904 -- in prefix notation may still be missing its controlling argument,
1905 -- so perform the transformation now.
1907 if SPARK_Mode
= On
and then In_Inlined_Body
then
1909 Subp
: constant Entity_Id
:= Entity
(Selector_Name
(P
));
1910 Typ
: constant Entity_Id
:= Etype
(Prefix
(P
));
1913 if Is_Tagged_Type
(Typ
)
1914 and then Present
(First_Formal
(Subp
))
1915 and then Etype
(First_Formal
(Subp
)) = Typ
1916 and then Try_Object_Operation
(P
)
1921 Analyze_Call_And_Resolve
;
1926 Analyze_Call_And_Resolve
;
1929 elsif Nkind
(P
) = N_Selected_Component
1930 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1931 and then Present
(Actuals
)
1932 and then No
(Next
(First
(Actuals
)))
1934 -- Can be call to parameterless entry family. What appears to be the
1935 -- sole argument is in fact the entry index. Rewrite prefix of node
1936 -- accordingly. Source representation is unchanged by this
1940 Make_Indexed_Component
(Loc
,
1941 Prefix
=> New_Copy
(P
),
1942 Expressions
=> Actuals
);
1943 Set_Name
(N
, New_N
);
1944 Set_Etype
(New_N
, Standard_Void_Type
);
1945 Set_Parameter_Associations
(N
, No_List
);
1946 Analyze_Call_And_Resolve
;
1948 -- For the case of a reference to an element of an entry family, P is
1949 -- an indexed component whose prefix is a selected component (task and
1950 -- entry family), and whose index is the entry family index.
1952 elsif Nkind
(P
) = N_Indexed_Component
1953 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1954 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1956 Analyze_Call_And_Resolve
;
1958 -- If the prefix is the name of an entry family, it is a call from
1959 -- within the task body itself.
1961 elsif Nkind
(P
) = N_Indexed_Component
1962 and then Nkind
(Prefix
(P
)) = N_Identifier
1963 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1966 Make_Selected_Component
(Loc
,
1968 New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1969 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1970 Rewrite
(Prefix
(P
), New_N
);
1972 Analyze_Call_And_Resolve
;
1974 -- In Ada 2012. a qualified expression is a name, but it cannot be a
1975 -- procedure name, so the construct can only be a qualified expression.
1977 elsif Nkind
(P
) = N_Qualified_Expression
1978 and then Ada_Version
>= Ada_2012
1980 Rewrite
(N
, Make_Code_Statement
(Loc
, Expression
=> P
));
1983 -- Anything else is an error
1986 Error_Msg_N
("invalid procedure or entry call", N
);
1990 Restore_Ghost_Mode
(Saved_GM
);
1991 end Analyze_Procedure_Call
;
1993 ------------------------------
1994 -- Analyze_Return_Statement --
1995 ------------------------------
1997 procedure Analyze_Return_Statement
(N
: Node_Id
) is
1998 pragma Assert
(Nkind_In
(N
, N_Extended_Return_Statement
,
1999 N_Simple_Return_Statement
));
2001 Returns_Object
: constant Boolean :=
2002 Nkind
(N
) = N_Extended_Return_Statement
2004 (Nkind
(N
) = N_Simple_Return_Statement
2005 and then Present
(Expression
(N
)));
2006 -- True if we're returning something; that is, "return <expression>;"
2007 -- or "return Result : T [:= ...]". False for "return;". Used for error
2008 -- checking: If Returns_Object is True, N should apply to a function
2009 -- body; otherwise N should apply to a procedure body, entry body,
2010 -- accept statement, or extended return statement.
2012 function Find_What_It_Applies_To
return Entity_Id
;
2013 -- Find the entity representing the innermost enclosing body, accept
2014 -- statement, or extended return statement. If the result is a callable
2015 -- construct or extended return statement, then this will be the value
2016 -- of the Return_Applies_To attribute. Otherwise, the program is
2017 -- illegal. See RM-6.5(4/2).
2019 -----------------------------
2020 -- Find_What_It_Applies_To --
2021 -----------------------------
2023 function Find_What_It_Applies_To
return Entity_Id
is
2024 Result
: Entity_Id
:= Empty
;
2027 -- Loop outward through the Scope_Stack, skipping blocks, loops,
2028 -- and postconditions.
2030 for J
in reverse 0 .. Scope_Stack
.Last
loop
2031 Result
:= Scope_Stack
.Table
(J
).Entity
;
2032 exit when not Ekind_In
(Result
, E_Block
, E_Loop
)
2033 and then Chars
(Result
) /= Name_uPostconditions
;
2036 pragma Assert
(Present
(Result
));
2038 end Find_What_It_Applies_To
;
2040 -- Local declarations
2042 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
2043 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
2044 Loc
: constant Source_Ptr
:= Sloc
(N
);
2045 Stm_Entity
: constant Entity_Id
:=
2047 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
2049 -- Start of processing for Analyze_Return_Statement
2052 Set_Return_Statement_Entity
(N
, Stm_Entity
);
2054 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
2055 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
2057 -- Place Return entity on scope stack, to simplify enforcement of 6.5
2058 -- (4/2): an inner return statement will apply to this extended return.
2060 if Nkind
(N
) = N_Extended_Return_Statement
then
2061 Push_Scope
(Stm_Entity
);
2064 -- Check that pragma No_Return is obeyed. Don't complain about the
2065 -- implicitly-generated return that is placed at the end.
2067 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
2068 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
2071 -- Warn on any unassigned OUT parameters if in procedure
2073 if Ekind
(Scope_Id
) = E_Procedure
then
2074 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
2077 -- Check that functions return objects, and other things do not
2079 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
2080 if not Returns_Object
then
2081 Error_Msg_N
("missing expression in return from function", N
);
2084 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
2085 if Returns_Object
then
2086 Error_Msg_N
("procedure cannot return value (use function)", N
);
2089 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
2090 if Returns_Object
then
2091 if Is_Protected_Type
(Scope
(Scope_Id
)) then
2092 Error_Msg_N
("entry body cannot return value", N
);
2094 Error_Msg_N
("accept statement cannot return value", N
);
2098 elsif Kind
= E_Return_Statement
then
2100 -- We are nested within another return statement, which must be an
2101 -- extended_return_statement.
2103 if Returns_Object
then
2104 if Nkind
(N
) = N_Extended_Return_Statement
then
2106 ("extended return statement cannot be nested (use `RETURN;`)",
2109 -- Case of a simple return statement with a value inside extended
2110 -- return statement.
2114 ("return nested in extended return statement cannot return "
2115 & "value (use `RETURN;`)", N
);
2120 Error_Msg_N
("illegal context for return statement", N
);
2123 if Ekind_In
(Kind
, E_Function
, E_Generic_Function
) then
2124 Analyze_Function_Return
(N
);
2126 elsif Ekind_In
(Kind
, E_Procedure
, E_Generic_Procedure
) then
2127 Set_Return_Present
(Scope_Id
);
2130 if Nkind
(N
) = N_Extended_Return_Statement
then
2134 Kill_Current_Values
(Last_Assignment_Only
=> True);
2135 Check_Unreachable_Code
(N
);
2137 Analyze_Dimension
(N
);
2138 end Analyze_Return_Statement
;
2140 -------------------------------------
2141 -- Analyze_Simple_Return_Statement --
2142 -------------------------------------
2144 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
2146 if Present
(Expression
(N
)) then
2147 Mark_Coextensions
(N
, Expression
(N
));
2150 Analyze_Return_Statement
(N
);
2151 end Analyze_Simple_Return_Statement
;
2153 -------------------------
2154 -- Analyze_Return_Type --
2155 -------------------------
2157 procedure Analyze_Return_Type
(N
: Node_Id
) is
2158 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2159 Typ
: Entity_Id
:= Empty
;
2162 -- Normal case where result definition does not indicate an error
2164 if Result_Definition
(N
) /= Error
then
2165 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
2166 Check_SPARK_05_Restriction
2167 ("access result is not allowed", Result_Definition
(N
));
2169 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
2172 AD
: constant Node_Id
:=
2173 Access_To_Subprogram_Definition
(Result_Definition
(N
));
2175 if Present
(AD
) and then Protected_Present
(AD
) then
2176 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
2178 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
2182 Set_Parent
(Typ
, Result_Definition
(N
));
2183 Set_Is_Local_Anonymous_Access
(Typ
);
2184 Set_Etype
(Designator
, Typ
);
2186 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2188 Null_Exclusion_Static_Checks
(N
);
2190 -- Subtype_Mark case
2193 Find_Type
(Result_Definition
(N
));
2194 Typ
:= Entity
(Result_Definition
(N
));
2195 Set_Etype
(Designator
, Typ
);
2197 -- Unconstrained array as result is not allowed in SPARK
2199 if Is_Array_Type
(Typ
) and then not Is_Constrained
(Typ
) then
2200 Check_SPARK_05_Restriction
2201 ("returning an unconstrained array is not allowed",
2202 Result_Definition
(N
));
2205 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
2207 Null_Exclusion_Static_Checks
(N
);
2209 -- If a null exclusion is imposed on the result type, then create
2210 -- a null-excluding itype (an access subtype) and use it as the
2211 -- function's Etype. Note that the null exclusion checks are done
2212 -- right before this, because they don't get applied to types that
2213 -- do not come from source.
2215 if Is_Access_Type
(Typ
) and then Null_Exclusion_Present
(N
) then
2216 Set_Etype
(Designator
,
2217 Create_Null_Excluding_Itype
2220 Scope_Id
=> Scope
(Current_Scope
)));
2222 -- The new subtype must be elaborated before use because
2223 -- it is visible outside of the function. However its base
2224 -- type may not be frozen yet, so the reference that will
2225 -- force elaboration must be attached to the freezing of
2228 -- If the return specification appears on a proper body,
2229 -- the subtype will have been created already on the spec.
2231 if Is_Frozen
(Typ
) then
2232 if Nkind
(Parent
(N
)) = N_Subprogram_Body
2233 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
2237 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
2241 Ensure_Freeze_Node
(Typ
);
2244 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
2246 Set_Itype
(IR
, Etype
(Designator
));
2247 Append_Freeze_Actions
(Typ
, New_List
(IR
));
2252 Set_Etype
(Designator
, Typ
);
2255 if Ekind
(Typ
) = E_Incomplete_Type
2256 or else (Is_Class_Wide_Type
(Typ
)
2257 and then Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
2259 -- AI05-0151: Tagged incomplete types are allowed in all formal
2260 -- parts. Untagged incomplete types are not allowed in bodies.
2261 -- As a consequence, limited views cannot appear in a basic
2262 -- declaration that is itself within a body, because there is
2263 -- no point at which the non-limited view will become visible.
2265 if Ada_Version
>= Ada_2012
then
2266 if From_Limited_With
(Typ
) and then In_Package_Body
then
2268 ("invalid use of incomplete type&",
2269 Result_Definition
(N
), Typ
);
2271 -- The return type of a subprogram body cannot be of a
2272 -- formal incomplete type.
2274 elsif Is_Generic_Type
(Typ
)
2275 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2278 ("return type cannot be a formal incomplete type",
2279 Result_Definition
(N
));
2281 elsif Is_Class_Wide_Type
(Typ
)
2282 and then Is_Generic_Type
(Root_Type
(Typ
))
2283 and then Nkind
(Parent
(N
)) = N_Subprogram_Body
2286 ("return type cannot be a formal incomplete type",
2287 Result_Definition
(N
));
2289 elsif Is_Tagged_Type
(Typ
) then
2292 -- Use is legal in a thunk generated for an operation
2293 -- inherited from a progenitor.
2295 elsif Is_Thunk
(Designator
)
2296 and then Present
(Non_Limited_View
(Typ
))
2300 elsif Nkind
(Parent
(N
)) = N_Subprogram_Body
2301 or else Nkind_In
(Parent
(Parent
(N
)), N_Accept_Statement
,
2305 ("invalid use of untagged incomplete type&",
2309 -- The type must be completed in the current package. This
2310 -- is checked at the end of the package declaration when
2311 -- Taft-amendment types are identified. If the return type
2312 -- is class-wide, there is no required check, the type can
2313 -- be a bona fide TAT.
2315 if Ekind
(Scope
(Current_Scope
)) = E_Package
2316 and then In_Private_Part
(Scope
(Current_Scope
))
2317 and then not Is_Class_Wide_Type
(Typ
)
2319 Append_Elmt
(Designator
, Private_Dependents
(Typ
));
2324 ("invalid use of incomplete type&", Designator
, Typ
);
2329 -- Case where result definition does indicate an error
2332 Set_Etype
(Designator
, Any_Type
);
2334 end Analyze_Return_Type
;
2336 -----------------------------
2337 -- Analyze_Subprogram_Body --
2338 -----------------------------
2340 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
2341 Loc
: constant Source_Ptr
:= Sloc
(N
);
2342 Body_Spec
: constant Node_Id
:= Specification
(N
);
2343 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
2346 if Debug_Flag_C
then
2347 Write_Str
("==> subprogram body ");
2348 Write_Name
(Chars
(Body_Id
));
2349 Write_Str
(" from ");
2350 Write_Location
(Loc
);
2355 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
2357 -- The real work is split out into the helper, so it can do "return;"
2358 -- without skipping the debug output:
2360 Analyze_Subprogram_Body_Helper
(N
);
2362 if Debug_Flag_C
then
2364 Write_Str
("<== subprogram body ");
2365 Write_Name
(Chars
(Body_Id
));
2366 Write_Str
(" from ");
2367 Write_Location
(Loc
);
2370 end Analyze_Subprogram_Body
;
2372 ------------------------------------
2373 -- Analyze_Subprogram_Body_Helper --
2374 ------------------------------------
2376 -- This procedure is called for regular subprogram bodies, generic bodies,
2377 -- and for subprogram stubs of both kinds. In the case of stubs, only the
2378 -- specification matters, and is used to create a proper declaration for
2379 -- the subprogram, or to perform conformance checks.
2381 -- WARNING: This routine manages Ghost regions. Return statements must be
2382 -- replaced by gotos which jump to the end of the routine and restore the
2385 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
2386 Body_Spec
: Node_Id
:= Specification
(N
);
2387 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
2388 Loc
: constant Source_Ptr
:= Sloc
(N
);
2389 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
2391 Conformant
: Boolean;
2392 Desig_View
: Entity_Id
:= Empty
;
2393 Exch_Views
: Elist_Id
:= No_Elist
;
2395 Mask_Types
: Elist_Id
:= No_Elist
;
2396 Prot_Typ
: Entity_Id
:= Empty
;
2397 Spec_Decl
: Node_Id
:= Empty
;
2398 Spec_Id
: Entity_Id
;
2400 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
2401 -- When we analyze a separate spec, the entity chain ends up containing
2402 -- the formals, as well as any itypes generated during analysis of the
2403 -- default expressions for parameters, or the arguments of associated
2404 -- precondition/postcondition pragmas (which are analyzed in the context
2405 -- of the spec since they have visibility on formals).
2407 -- These entities belong with the spec and not the body. However we do
2408 -- the analysis of the body in the context of the spec (again to obtain
2409 -- visibility to the formals), and all the entities generated during
2410 -- this analysis end up also chained to the entity chain of the spec.
2411 -- But they really belong to the body, and there is circuitry to move
2412 -- them from the spec to the body.
2414 -- However, when we do this move, we don't want to move the real spec
2415 -- entities (first para above) to the body. The Last_Real_Spec_Entity
2416 -- variable points to the last real spec entity, so we only move those
2417 -- chained beyond that point. It is initialized to Empty to deal with
2418 -- the case where there is no separate spec.
2420 function Body_Has_Contract
return Boolean;
2421 -- Check whether unanalyzed body has an aspect or pragma that may
2422 -- generate a SPARK contract.
2424 function Body_Has_SPARK_Mode_On
return Boolean;
2425 -- Check whether SPARK_Mode On applies to the subprogram body, either
2426 -- because it is specified directly on the body, or because it is
2427 -- inherited from the enclosing subprogram or package.
2429 procedure Build_Subprogram_Declaration
;
2430 -- Create a matching subprogram declaration for subprogram body N
2432 procedure Check_Anonymous_Return
;
2433 -- Ada 2005: if a function returns an access type that denotes a task,
2434 -- or a type that contains tasks, we must create a master entity for
2435 -- the anonymous type, which typically will be used in an allocator
2436 -- in the body of the function.
2438 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
2439 -- Look ahead to recognize a pragma that may appear after the body.
2440 -- If there is a previous spec, check that it appears in the same
2441 -- declarative part. If the pragma is Inline_Always, perform inlining
2442 -- unconditionally, otherwise only if Front_End_Inlining is requested.
2443 -- If the body acts as a spec, and inlining is required, we create a
2444 -- subprogram declaration for it, in order to attach the body to inline.
2445 -- If pragma does not appear after the body, check whether there is
2446 -- an inline pragma before any local declarations.
2448 procedure Check_Missing_Return
;
2449 -- Checks for a function with a no return statements, and also performs
2450 -- the warning checks implemented by Check_Returns. In formal mode, also
2451 -- verify that a function ends with a RETURN and that a procedure does
2452 -- not contain any RETURN.
2454 function Disambiguate_Spec
return Entity_Id
;
2455 -- When a primitive is declared between the private view and the full
2456 -- view of a concurrent type which implements an interface, a special
2457 -- mechanism is used to find the corresponding spec of the primitive
2460 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
;
2461 -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains
2462 -- incomplete types coming from a limited context and replace their
2463 -- limited views with the non-limited ones. Return the list of changes
2464 -- to be used to undo the transformation.
2466 function Is_Private_Concurrent_Primitive
2467 (Subp_Id
: Entity_Id
) return Boolean;
2468 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
2469 -- type that implements an interface and has a private view.
2471 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
;
2472 -- N is the body generated for an expression function that is not a
2473 -- completion and Spec_Id the defining entity of its spec. Mark all
2474 -- the not-yet-frozen types referenced by the simple return statement
2475 -- of the function as formally frozen.
2477 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
);
2478 -- Undo the transformation done by Exchange_Limited_Views.
2480 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
2481 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
2482 -- subprogram whose body is being analyzed. N is the statement node
2483 -- causing the flag to be set, if the following statement is a return
2484 -- of an entity, we mark the entity as set in source to suppress any
2485 -- warning on the stylized use of function stubs with a dummy return.
2487 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
);
2488 -- Undo the transformation done by Mask_Unfrozen_Types
2490 procedure Verify_Overriding_Indicator
;
2491 -- If there was a previous spec, the entity has been entered in the
2492 -- current scope previously. If the body itself carries an overriding
2493 -- indicator, check that it is consistent with the known status of the
2496 -----------------------
2497 -- Body_Has_Contract --
2498 -----------------------
2500 function Body_Has_Contract
return Boolean is
2501 Decls
: constant List_Id
:= Declarations
(N
);
2505 -- Check for aspects that may generate a contract
2507 if Present
(Aspect_Specifications
(N
)) then
2508 Item
:= First
(Aspect_Specifications
(N
));
2509 while Present
(Item
) loop
2510 if Is_Subprogram_Contract_Annotation
(Item
) then
2518 -- Check for pragmas that may generate a contract
2520 if Present
(Decls
) then
2521 Item
:= First
(Decls
);
2522 while Present
(Item
) loop
2523 if Nkind
(Item
) = N_Pragma
2524 and then Is_Subprogram_Contract_Annotation
(Item
)
2534 end Body_Has_Contract
;
2536 ----------------------------
2537 -- Body_Has_SPARK_Mode_On --
2538 ----------------------------
2540 function Body_Has_SPARK_Mode_On
return Boolean is
2541 Decls
: constant List_Id
:= Declarations
(N
);
2545 -- Check for SPARK_Mode aspect
2547 if Present
(Aspect_Specifications
(N
)) then
2548 Item
:= First
(Aspect_Specifications
(N
));
2549 while Present
(Item
) loop
2550 if Get_Aspect_Id
(Item
) = Aspect_SPARK_Mode
then
2551 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2558 -- Check for SPARK_Mode pragma
2560 if Present
(Decls
) then
2561 Item
:= First
(Decls
);
2562 while Present
(Item
) loop
2564 -- Pragmas that apply to a subprogram body are usually grouped
2565 -- together. Look for a potential pragma SPARK_Mode among them.
2567 if Nkind
(Item
) = N_Pragma
then
2568 if Get_Pragma_Id
(Item
) = Pragma_SPARK_Mode
then
2569 return Get_SPARK_Mode_From_Annotation
(Item
) = On
;
2572 -- Otherwise the first non-pragma declarative item terminates
2573 -- the region where pragma SPARK_Mode may appear.
2583 -- Otherwise, the applicable SPARK_Mode is inherited from the
2584 -- enclosing subprogram or package.
2586 return SPARK_Mode
= On
;
2587 end Body_Has_SPARK_Mode_On
;
2589 ----------------------------------
2590 -- Build_Subprogram_Declaration --
2591 ----------------------------------
2593 procedure Build_Subprogram_Declaration
is
2594 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
);
2595 -- Relocate certain categorization pragmas from the declarative list
2596 -- of subprogram body From and insert them after node To. The pragmas
2599 -- Volatile_Function
2600 -- Also copy pragma SPARK_Mode if present in the declarative list
2601 -- of subprogram body From and insert it after node To. This pragma
2602 -- should not be moved, as it applies to the body too.
2608 procedure Move_Pragmas
(From
: Node_Id
; To
: Node_Id
) is
2610 Next_Decl
: Node_Id
;
2613 pragma Assert
(Nkind
(From
) = N_Subprogram_Body
);
2615 -- The destination node must be part of a list, as the pragmas are
2616 -- inserted after it.
2618 pragma Assert
(Is_List_Member
(To
));
2620 -- Inspect the declarations of the subprogram body looking for
2621 -- specific pragmas.
2623 Decl
:= First
(Declarations
(N
));
2624 while Present
(Decl
) loop
2625 Next_Decl
:= Next
(Decl
);
2627 if Nkind
(Decl
) = N_Pragma
then
2628 if Pragma_Name_Unmapped
(Decl
) = Name_SPARK_Mode
then
2629 Insert_After
(To
, New_Copy_Tree
(Decl
));
2631 elsif Nam_In
(Pragma_Name_Unmapped
(Decl
),
2633 Name_Volatile_Function
)
2636 Insert_After
(To
, Decl
);
2647 Subp_Decl
: Node_Id
;
2649 -- Start of processing for Build_Subprogram_Declaration
2652 -- Create a matching subprogram spec using the profile of the body.
2653 -- The structure of the tree is identical, but has new entities for
2654 -- the defining unit name and formal parameters.
2657 Make_Subprogram_Declaration
(Loc
,
2658 Specification
=> Copy_Subprogram_Spec
(Body_Spec
));
2659 Set_Comes_From_Source
(Subp_Decl
, True);
2661 -- Relocate the aspects and relevant pragmas from the subprogram body
2662 -- to the generated spec because it acts as the initial declaration.
2664 Insert_Before
(N
, Subp_Decl
);
2665 Move_Aspects
(N
, To
=> Subp_Decl
);
2666 Move_Pragmas
(N
, To
=> Subp_Decl
);
2668 -- Ensure that the generated corresponding spec and original body
2669 -- share the same SPARK_Mode pragma or aspect. As a result, both have
2670 -- the same SPARK_Mode attributes, and the global SPARK_Mode value is
2671 -- correctly set for local subprograms.
2673 Copy_SPARK_Mode_Aspect
(Subp_Decl
, To
=> N
);
2675 Analyze
(Subp_Decl
);
2677 -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to
2678 -- the body since the expander may generate calls using that entity.
2679 -- Required to ensure that Expand_Call rewrites calls to this
2680 -- function by calls to the built procedure.
2682 if Modify_Tree_For_C
2683 and then Nkind
(Body_Spec
) = N_Function_Specification
2685 Rewritten_For_C
(Defining_Entity
(Specification
(Subp_Decl
)))
2687 Set_Rewritten_For_C
(Defining_Entity
(Body_Spec
));
2688 Set_Corresponding_Procedure
(Defining_Entity
(Body_Spec
),
2689 Corresponding_Procedure
2690 (Defining_Entity
(Specification
(Subp_Decl
))));
2693 -- Analyze any relocated source pragmas or pragmas created for aspect
2696 Decl
:= Next
(Subp_Decl
);
2697 while Present
(Decl
) loop
2699 -- Stop the search for pragmas once the body has been reached as
2700 -- this terminates the region where pragmas may appear.
2705 elsif Nkind
(Decl
) = N_Pragma
then
2712 Spec_Id
:= Defining_Entity
(Subp_Decl
);
2713 Set_Corresponding_Spec
(N
, Spec_Id
);
2715 -- Mark the generated spec as a source construct to ensure that all
2716 -- calls to it are properly registered in ALI files for GNATprove.
2718 Set_Comes_From_Source
(Spec_Id
, True);
2720 -- Ensure that the specs of the subprogram declaration and its body
2721 -- are identical, otherwise they will appear non-conformant due to
2722 -- rewritings in the default values of formal parameters.
2724 Body_Spec
:= Copy_Subprogram_Spec
(Body_Spec
);
2725 Set_Specification
(N
, Body_Spec
);
2726 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2727 end Build_Subprogram_Declaration
;
2729 ----------------------------
2730 -- Check_Anonymous_Return --
2731 ----------------------------
2733 procedure Check_Anonymous_Return
is
2739 if Present
(Spec_Id
) then
2745 if Ekind
(Scop
) = E_Function
2746 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
2747 and then not Is_Thunk
(Scop
)
2749 -- Skip internally built functions which handle the case of
2750 -- a null access (see Expand_Interface_Conversion)
2752 and then not (Is_Interface
(Designated_Type
(Etype
(Scop
)))
2753 and then not Comes_From_Source
(Parent
(Scop
)))
2755 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
2757 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
2759 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
2760 and then Expander_Active
2762 -- Avoid cases with no tasking support
2764 and then RTE_Available
(RE_Current_Master
)
2765 and then not Restriction_Active
(No_Task_Hierarchy
)
2768 Make_Object_Declaration
(Loc
,
2769 Defining_Identifier
=>
2770 Make_Defining_Identifier
(Loc
, Name_uMaster
),
2771 Constant_Present
=> True,
2772 Object_Definition
=>
2773 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
),
2775 Make_Explicit_Dereference
(Loc
,
2776 New_Occurrence_Of
(RTE
(RE_Current_Master
), Loc
)));
2778 if Present
(Declarations
(N
)) then
2779 Prepend
(Decl
, Declarations
(N
));
2781 Set_Declarations
(N
, New_List
(Decl
));
2784 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
2785 Set_Has_Master_Entity
(Scop
);
2787 -- Now mark the containing scope as a task master
2790 while Nkind
(Par
) /= N_Compilation_Unit
loop
2791 Par
:= Parent
(Par
);
2792 pragma Assert
(Present
(Par
));
2794 -- If we fall off the top, we are at the outer level, and
2795 -- the environment task is our effective master, so nothing
2799 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
2801 Set_Is_Task_Master
(Par
, True);
2806 end Check_Anonymous_Return
;
2808 -------------------------
2809 -- Check_Inline_Pragma --
2810 -------------------------
2812 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
2816 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
2817 -- True when N is a pragma Inline or Inline_Always that applies
2818 -- to this subprogram.
2820 -----------------------
2821 -- Is_Inline_Pragma --
2822 -----------------------
2824 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
2826 if Nkind
(N
) = N_Pragma
2828 (Pragma_Name_Unmapped
(N
) = Name_Inline_Always
2829 or else (Pragma_Name_Unmapped
(N
) = Name_Inline
2831 (Front_End_Inlining
or else Optimization_Level
> 0)))
2832 and then Present
(Pragma_Argument_Associations
(N
))
2835 Pragma_Arg
: Node_Id
:=
2836 Expression
(First
(Pragma_Argument_Associations
(N
)));
2838 if Nkind
(Pragma_Arg
) = N_Selected_Component
then
2839 Pragma_Arg
:= Selector_Name
(Pragma_Arg
);
2842 return Chars
(Pragma_Arg
) = Chars
(Body_Id
);
2848 end Is_Inline_Pragma
;
2850 -- Start of processing for Check_Inline_Pragma
2853 if not Expander_Active
then
2857 if Is_List_Member
(N
)
2858 and then Present
(Next
(N
))
2859 and then Is_Inline_Pragma
(Next
(N
))
2863 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
2864 and then Present
(Declarations
(N
))
2865 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
2867 Prag
:= First
(Declarations
(N
));
2873 if Present
(Prag
) then
2874 if Present
(Spec_Id
) then
2875 if Is_List_Member
(N
)
2876 and then Is_List_Member
(Unit_Declaration_Node
(Spec_Id
))
2877 and then In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
))
2883 -- Create a subprogram declaration, to make treatment uniform.
2884 -- Make the sloc of the subprogram name that of the entity in
2885 -- the body, so that style checks find identical strings.
2888 Subp
: constant Entity_Id
:=
2889 Make_Defining_Identifier
2890 (Sloc
(Body_Id
), Chars
(Body_Id
));
2891 Decl
: constant Node_Id
:=
2892 Make_Subprogram_Declaration
(Loc
,
2894 New_Copy_Tree
(Specification
(N
)));
2897 -- Link the body and the generated spec
2899 Set_Corresponding_Body
(Decl
, Body_Id
);
2900 Set_Corresponding_Spec
(N
, Subp
);
2902 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
2904 -- To ensure proper coverage when body is inlined, indicate
2905 -- whether the subprogram comes from source.
2907 Set_Comes_From_Source
(Subp
, Comes_From_Source
(N
));
2909 if Present
(First_Formal
(Body_Id
)) then
2910 Plist
:= Copy_Parameter_List
(Body_Id
);
2911 Set_Parameter_Specifications
2912 (Specification
(Decl
), Plist
);
2915 -- Move aspects to the new spec
2917 if Has_Aspects
(N
) then
2918 Move_Aspects
(N
, To
=> Decl
);
2921 Insert_Before
(N
, Decl
);
2924 Set_Has_Pragma_Inline
(Subp
);
2926 if Pragma_Name
(Prag
) = Name_Inline_Always
then
2927 Set_Is_Inlined
(Subp
);
2928 Set_Has_Pragma_Inline_Always
(Subp
);
2931 -- Prior to copying the subprogram body to create a template
2932 -- for it for subsequent inlining, remove the pragma from
2933 -- the current body so that the copy that will produce the
2934 -- new body will start from a completely unanalyzed tree.
2936 if Nkind
(Parent
(Prag
)) = N_Subprogram_Body
then
2937 Rewrite
(Prag
, Make_Null_Statement
(Sloc
(Prag
)));
2944 end Check_Inline_Pragma
;
2946 --------------------------
2947 -- Check_Missing_Return --
2948 --------------------------
2950 procedure Check_Missing_Return
is
2952 Missing_Ret
: Boolean;
2955 if Nkind
(Body_Spec
) = N_Function_Specification
then
2956 if Present
(Spec_Id
) then
2962 if Return_Present
(Id
) then
2963 Check_Returns
(HSS
, 'F', Missing_Ret
);
2966 Set_Has_Missing_Return
(Id
);
2969 -- Within a premature instantiation of a package with no body, we
2970 -- build completions of the functions therein, with a Raise
2971 -- statement. No point in complaining about a missing return in
2974 elsif Ekind
(Id
) = E_Function
2975 and then In_Instance
2976 and then Present
(Statements
(HSS
))
2977 and then Nkind
(First
(Statements
(HSS
))) = N_Raise_Program_Error
2981 elsif Is_Generic_Subprogram
(Id
)
2982 or else not Is_Machine_Code_Subprogram
(Id
)
2984 Error_Msg_N
("missing RETURN statement in function body", N
);
2987 -- If procedure with No_Return, check returns
2989 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
2990 and then Present
(Spec_Id
)
2991 and then No_Return
(Spec_Id
)
2993 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
2996 -- Special checks in SPARK mode
2998 if Nkind
(Body_Spec
) = N_Function_Specification
then
3000 -- In SPARK mode, last statement of a function should be a return
3003 Stat
: constant Node_Id
:= Last_Source_Statement
(HSS
);
3006 and then not Nkind_In
(Stat
, N_Simple_Return_Statement
,
3007 N_Extended_Return_Statement
)
3009 Check_SPARK_05_Restriction
3010 ("last statement in function should be RETURN", Stat
);
3014 -- In SPARK mode, verify that a procedure has no return
3016 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
then
3017 if Present
(Spec_Id
) then
3023 -- Would be nice to point to return statement here, can we
3024 -- borrow the Check_Returns procedure here ???
3026 if Return_Present
(Id
) then
3027 Check_SPARK_05_Restriction
3028 ("procedure should not have RETURN", N
);
3031 end Check_Missing_Return
;
3033 -----------------------
3034 -- Disambiguate_Spec --
3035 -----------------------
3037 function Disambiguate_Spec
return Entity_Id
is
3038 Priv_Spec
: Entity_Id
;
3041 procedure Replace_Types
(To_Corresponding
: Boolean);
3042 -- Depending on the flag, replace the type of formal parameters of
3043 -- Body_Id if it is a concurrent type implementing interfaces with
3044 -- the corresponding record type or the other way around.
3046 procedure Replace_Types
(To_Corresponding
: Boolean) is
3048 Formal_Typ
: Entity_Id
;
3051 Formal
:= First_Formal
(Body_Id
);
3052 while Present
(Formal
) loop
3053 Formal_Typ
:= Etype
(Formal
);
3055 if Is_Class_Wide_Type
(Formal_Typ
) then
3056 Formal_Typ
:= Root_Type
(Formal_Typ
);
3059 -- From concurrent type to corresponding record
3061 if To_Corresponding
then
3062 if Is_Concurrent_Type
(Formal_Typ
)
3063 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
3066 (Corresponding_Record_Type
(Formal_Typ
)))
3069 Corresponding_Record_Type
(Formal_Typ
));
3072 -- From corresponding record to concurrent type
3075 if Is_Concurrent_Record_Type
(Formal_Typ
)
3076 and then Present
(Interfaces
(Formal_Typ
))
3079 Corresponding_Concurrent_Type
(Formal_Typ
));
3083 Next_Formal
(Formal
);
3087 -- Start of processing for Disambiguate_Spec
3090 -- Try to retrieve the specification of the body as is. All error
3091 -- messages are suppressed because the body may not have a spec in
3092 -- its current state.
3094 Spec_N
:= Find_Corresponding_Spec
(N
, False);
3096 -- It is possible that this is the body of a primitive declared
3097 -- between a private and a full view of a concurrent type. The
3098 -- controlling parameter of the spec carries the concurrent type,
3099 -- not the corresponding record type as transformed by Analyze_
3100 -- Subprogram_Specification. In such cases, we undo the change
3101 -- made by the analysis of the specification and try to find the
3104 -- Note that wrappers already have their corresponding specs and
3105 -- bodies set during their creation, so if the candidate spec is
3106 -- a wrapper, then we definitely need to swap all types to their
3107 -- original concurrent status.
3110 or else Is_Primitive_Wrapper
(Spec_N
)
3112 -- Restore all references of corresponding record types to the
3113 -- original concurrent types.
3115 Replace_Types
(To_Corresponding
=> False);
3116 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
3118 -- The current body truly belongs to a primitive declared between
3119 -- a private and a full view. We leave the modified body as is,
3120 -- and return the true spec.
3122 if Present
(Priv_Spec
)
3123 and then Is_Private_Primitive
(Priv_Spec
)
3128 -- In case that this is some sort of error, restore the original
3129 -- state of the body.
3131 Replace_Types
(To_Corresponding
=> True);
3135 end Disambiguate_Spec
;
3137 ----------------------------
3138 -- Exchange_Limited_Views --
3139 ----------------------------
3141 function Exchange_Limited_Views
(Subp_Id
: Entity_Id
) return Elist_Id
is
3142 Result
: Elist_Id
:= No_Elist
;
3144 procedure Detect_And_Exchange
(Id
: Entity_Id
);
3145 -- Determine whether Id's type denotes an incomplete type associated
3146 -- with a limited with clause and exchange the limited view with the
3147 -- non-limited one when available. Note that the non-limited view
3148 -- may exist because of a with_clause in another unit in the context,
3149 -- but cannot be used because the current view of the enclosing unit
3150 -- is still a limited view.
3152 -------------------------
3153 -- Detect_And_Exchange --
3154 -------------------------
3156 procedure Detect_And_Exchange
(Id
: Entity_Id
) is
3157 Typ
: constant Entity_Id
:= Etype
(Id
);
3159 if From_Limited_With
(Typ
)
3160 and then Has_Non_Limited_View
(Typ
)
3161 and then not From_Limited_With
(Scope
(Typ
))
3164 Result
:= New_Elmt_List
;
3167 Prepend_Elmt
(Typ
, Result
);
3168 Prepend_Elmt
(Id
, Result
);
3169 Set_Etype
(Id
, Non_Limited_View
(Typ
));
3171 end Detect_And_Exchange
;
3177 -- Start of processing for Exchange_Limited_Views
3180 -- Do not process subprogram bodies as they already use the non-
3181 -- limited view of types.
3183 if not Ekind_In
(Subp_Id
, E_Function
, E_Procedure
) then
3187 -- Examine all formals and swap views when applicable
3189 Formal
:= First_Formal
(Subp_Id
);
3190 while Present
(Formal
) loop
3191 Detect_And_Exchange
(Formal
);
3193 Next_Formal
(Formal
);
3196 -- Process the return type of a function
3198 if Ekind
(Subp_Id
) = E_Function
then
3199 Detect_And_Exchange
(Subp_Id
);
3203 end Exchange_Limited_Views
;
3205 -------------------------------------
3206 -- Is_Private_Concurrent_Primitive --
3207 -------------------------------------
3209 function Is_Private_Concurrent_Primitive
3210 (Subp_Id
: Entity_Id
) return Boolean
3212 Formal_Typ
: Entity_Id
;
3215 if Present
(First_Formal
(Subp_Id
)) then
3216 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
3218 if Is_Concurrent_Record_Type
(Formal_Typ
) then
3219 if Is_Class_Wide_Type
(Formal_Typ
) then
3220 Formal_Typ
:= Root_Type
(Formal_Typ
);
3223 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
3226 -- The type of the first formal is a concurrent tagged type with
3230 Is_Concurrent_Type
(Formal_Typ
)
3231 and then Is_Tagged_Type
(Formal_Typ
)
3232 and then Has_Private_Declaration
(Formal_Typ
);
3236 end Is_Private_Concurrent_Primitive
;
3238 -------------------------
3239 -- Mask_Unfrozen_Types --
3240 -------------------------
3242 function Mask_Unfrozen_Types
(Spec_Id
: Entity_Id
) return Elist_Id
is
3243 Result
: Elist_Id
:= No_Elist
;
3245 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
;
3246 -- Mask all types referenced in the subtree rooted at Node
3248 --------------------
3249 -- Mask_Type_Refs --
3250 --------------------
3252 function Mask_Type_Refs
(Node
: Node_Id
) return Traverse_Result
is
3253 procedure Mask_Type
(Typ
: Entity_Id
);
3254 -- ??? what does this do?
3260 procedure Mask_Type
(Typ
: Entity_Id
) is
3262 -- Skip Itypes created by the preanalysis
3265 and then Scope_Within_Or_Same
(Scope
(Typ
), Spec_Id
)
3270 if not Is_Frozen
(Typ
) then
3271 Set_Is_Frozen
(Typ
);
3272 Append_New_Elmt
(Typ
, Result
);
3276 -- Start of processing for Mask_Type_Refs
3279 if Is_Entity_Name
(Node
) and then Present
(Entity
(Node
)) then
3280 Mask_Type
(Etype
(Entity
(Node
)));
3282 if Ekind_In
(Entity
(Node
), E_Component
, E_Discriminant
) then
3283 Mask_Type
(Scope
(Entity
(Node
)));
3286 elsif Nkind_In
(Node
, N_Aggregate
, N_Null
, N_Type_Conversion
)
3287 and then Present
(Etype
(Node
))
3289 Mask_Type
(Etype
(Node
));
3295 procedure Mask_References
is new Traverse_Proc
(Mask_Type_Refs
);
3299 Return_Stmt
: constant Node_Id
:=
3300 First
(Statements
(Handled_Statement_Sequence
(N
)));
3302 -- Start of processing for Mask_Unfrozen_Types
3305 pragma Assert
(Nkind
(Return_Stmt
) = N_Simple_Return_Statement
);
3307 Mask_References
(Expression
(Return_Stmt
));
3310 end Mask_Unfrozen_Types
;
3312 ---------------------------
3313 -- Restore_Limited_Views --
3314 ---------------------------
3316 procedure Restore_Limited_Views
(Restore_List
: Elist_Id
) is
3317 Elmt
: Elmt_Id
:= First_Elmt
(Restore_List
);
3321 while Present
(Elmt
) loop
3324 Set_Etype
(Id
, Node
(Elmt
));
3327 end Restore_Limited_Views
;
3329 ----------------------------
3330 -- Set_Trivial_Subprogram --
3331 ----------------------------
3333 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
3334 Nxt
: constant Node_Id
:= Next
(N
);
3337 Set_Is_Trivial_Subprogram
(Body_Id
);
3339 if Present
(Spec_Id
) then
3340 Set_Is_Trivial_Subprogram
(Spec_Id
);
3344 and then Nkind
(Nxt
) = N_Simple_Return_Statement
3345 and then No
(Next
(Nxt
))
3346 and then Present
(Expression
(Nxt
))
3347 and then Is_Entity_Name
(Expression
(Nxt
))
3349 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
3351 end Set_Trivial_Subprogram
;
3353 ---------------------------
3354 -- Unmask_Unfrozen_Types --
3355 ---------------------------
3357 procedure Unmask_Unfrozen_Types
(Unmask_List
: Elist_Id
) is
3358 Elmt
: Elmt_Id
:= First_Elmt
(Unmask_List
);
3361 while Present
(Elmt
) loop
3362 Set_Is_Frozen
(Node
(Elmt
), False);
3365 end Unmask_Unfrozen_Types
;
3367 ---------------------------------
3368 -- Verify_Overriding_Indicator --
3369 ---------------------------------
3371 procedure Verify_Overriding_Indicator
is
3373 if Must_Override
(Body_Spec
) then
3374 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3375 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3379 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
3381 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
3383 -- Overriding indicators aren't allowed for protected subprogram
3384 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3385 -- this to a warning if -gnatd.E is enabled.
3387 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3388 Error_Msg_Warn
:= Error_To_Warning
;
3390 ("<<overriding indicator not allowed for protected "
3391 & "subprogram body", Body_Spec
);
3394 elsif Must_Not_Override
(Body_Spec
) then
3395 if Present
(Overridden_Operation
(Spec_Id
)) then
3397 ("subprogram& overrides inherited operation",
3398 Body_Spec
, Spec_Id
);
3400 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
3401 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
3404 ("subprogram& overrides predefined operator ",
3405 Body_Spec
, Spec_Id
);
3407 -- Overriding indicators aren't allowed for protected subprogram
3408 -- bodies (see the Confirmation in Ada Comment AC95-00213). Change
3409 -- this to a warning if -gnatd.E is enabled.
3411 elsif Ekind
(Scope
(Spec_Id
)) = E_Protected_Type
then
3412 Error_Msg_Warn
:= Error_To_Warning
;
3415 ("<<overriding indicator not allowed "
3416 & "for protected subprogram body", Body_Spec
);
3418 -- If this is not a primitive operation, then the overriding
3419 -- indicator is altogether illegal.
3421 elsif not Is_Primitive
(Spec_Id
) then
3423 ("overriding indicator only allowed "
3424 & "if subprogram is primitive", Body_Spec
);
3427 -- If checking the style rule and the operation overrides, then
3428 -- issue a warning about a missing overriding_indicator. Protected
3429 -- subprogram bodies are excluded from this style checking, since
3430 -- they aren't primitives (even though their declarations can
3431 -- override) and aren't allowed to have an overriding_indicator.
3434 and then Present
(Overridden_Operation
(Spec_Id
))
3435 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
3437 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3438 Style
.Missing_Overriding
(N
, Body_Id
);
3441 and then Can_Override_Operator
(Spec_Id
)
3442 and then not In_Predefined_Unit
(Spec_Id
)
3444 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
3445 Style
.Missing_Overriding
(N
, Body_Id
);
3447 end Verify_Overriding_Indicator
;
3451 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3452 Saved_ISMP
: constant Boolean :=
3453 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3454 -- Save the Ghost and SPARK mode-related data to restore on exit
3456 -- Start of processing for Analyze_Subprogram_Body_Helper
3459 -- A [generic] subprogram body "freezes" the contract of the nearest
3460 -- enclosing package body and all other contracts encountered in the
3461 -- same declarative part up to and excluding the subprogram body:
3463 -- package body Nearest_Enclosing_Package
3464 -- with Refined_State => (State => Constit)
3468 -- procedure Freezes_Enclosing_Package_Body
3469 -- with Refined_Depends => (Input => Constit) ...
3471 -- This ensures that any annotations referenced by the contract of the
3472 -- [generic] subprogram body are available. This form of "freezing" is
3473 -- decoupled from the usual Freeze_xxx mechanism because it must also
3474 -- work in the context of generics where normal freezing is disabled.
3476 -- Only bodies coming from source should cause this type of "freezing".
3477 -- Expression functions that act as bodies and complete an initial
3478 -- declaration must be included in this category, hence the use of
3481 if Comes_From_Source
(Original_Node
(N
)) then
3482 Analyze_Previous_Contracts
(N
);
3485 -- Generic subprograms are handled separately. They always have a
3486 -- generic specification. Determine whether current scope has a
3487 -- previous declaration.
3489 -- If the subprogram body is defined within an instance of the same
3490 -- name, the instance appears as a package renaming, and will be hidden
3491 -- within the subprogram.
3493 if Present
(Prev_Id
)
3494 and then not Is_Overloadable
(Prev_Id
)
3495 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
3496 or else Comes_From_Source
(Prev_Id
))
3498 if Is_Generic_Subprogram
(Prev_Id
) then
3501 -- A subprogram body is Ghost when it is stand alone and subject
3502 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3503 -- the mode now to ensure that any nodes generated during analysis
3504 -- and expansion are properly marked as Ghost.
3506 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3508 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3509 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3511 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
3513 if Nkind
(N
) = N_Subprogram_Body
then
3514 HSS
:= Handled_Statement_Sequence
(N
);
3515 Check_Missing_Return
;
3520 -- Otherwise a previous entity conflicts with the subprogram name.
3521 -- Attempting to enter name will post error.
3524 Enter_Name
(Body_Id
);
3528 -- Non-generic case, find the subprogram declaration, if one was seen,
3529 -- or enter new overloaded entity in the current scope. If the
3530 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
3531 -- part of the context of one of its subunits. No need to redo the
3534 elsif Prev_Id
= Body_Id
and then Has_Completion
(Body_Id
) then
3538 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
3540 if Nkind
(N
) = N_Subprogram_Body_Stub
3541 or else No
(Corresponding_Spec
(N
))
3543 if Is_Private_Concurrent_Primitive
(Body_Id
) then
3544 Spec_Id
:= Disambiguate_Spec
;
3546 -- A subprogram body is Ghost when it is stand alone and
3547 -- subject to pragma Ghost or when the corresponding spec is
3548 -- Ghost. Set the mode now to ensure that any nodes generated
3549 -- during analysis and expansion are properly marked as Ghost.
3551 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3554 Spec_Id
:= Find_Corresponding_Spec
(N
);
3556 -- A subprogram body is Ghost when it is stand alone and
3557 -- subject to pragma Ghost or when the corresponding spec is
3558 -- Ghost. Set the mode now to ensure that any nodes generated
3559 -- during analysis and expansion are properly marked as Ghost.
3561 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3563 -- In GNATprove mode, if the body has no previous spec, create
3564 -- one so that the inlining machinery can operate properly.
3565 -- Transfer aspects, if any, to the new spec, so that they
3566 -- are legal and can be processed ahead of the body.
3567 -- We make two copies of the given spec, one for the new
3568 -- declaration, and one for the body.
3570 if No
(Spec_Id
) and then GNATprove_Mode
3572 -- Inlining does not apply during pre-analysis of code
3574 and then Full_Analysis
3576 -- Inlining only applies to full bodies, not stubs
3578 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3580 -- Inlining only applies to bodies in the source code, not to
3581 -- those generated by the compiler. In particular, expression
3582 -- functions, whose body is generated by the compiler, are
3583 -- treated specially by GNATprove.
3585 and then Comes_From_Source
(Body_Id
)
3587 -- This cannot be done for a compilation unit, which is not
3588 -- in a context where we can insert a new spec.
3590 and then Is_List_Member
(N
)
3592 -- Inlining only applies to subprograms without contracts,
3593 -- as a contract is a sign that GNATprove should perform a
3594 -- modular analysis of the subprogram instead of a contextual
3595 -- analysis at each call site. The same test is performed in
3596 -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated
3597 -- here in another form (because the contract has not been
3598 -- attached to the body) to avoid front-end errors in case
3599 -- pragmas are used instead of aspects, because the
3600 -- corresponding pragmas in the body would not be transferred
3601 -- to the spec, leading to legality errors.
3603 and then not Body_Has_Contract
3604 and then not Inside_A_Generic
3606 Build_Subprogram_Declaration
;
3608 -- If this is a function that returns a constrained array, and
3609 -- we are generating SPARK_For_C, create subprogram declaration
3610 -- to simplify subsequent C generation.
3613 and then Modify_Tree_For_C
3614 and then Nkind
(Body_Spec
) = N_Function_Specification
3615 and then Is_Array_Type
(Etype
(Body_Id
))
3616 and then Is_Constrained
(Etype
(Body_Id
))
3618 Build_Subprogram_Declaration
;
3622 -- If this is a duplicate body, no point in analyzing it
3624 if Error_Posted
(N
) then
3628 -- A subprogram body should cause freezing of its own declaration,
3629 -- but if there was no previous explicit declaration, then the
3630 -- subprogram will get frozen too late (there may be code within
3631 -- the body that depends on the subprogram having been frozen,
3632 -- such as uses of extra formals), so we force it to be frozen
3633 -- here. Same holds if the body and spec are compilation units.
3634 -- Finally, if the return type is an anonymous access to protected
3635 -- subprogram, it must be frozen before the body because its
3636 -- expansion has generated an equivalent type that is used when
3637 -- elaborating the body.
3639 -- An exception in the case of Ada 2012, AI05-177: The bodies
3640 -- created for expression functions do not freeze.
3643 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3645 Freeze_Before
(N
, Body_Id
);
3647 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3648 Freeze_Before
(N
, Spec_Id
);
3650 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
3651 Freeze_Before
(N
, Etype
(Body_Id
));
3655 Spec_Id
:= Corresponding_Spec
(N
);
3657 -- A subprogram body is Ghost when it is stand alone and subject
3658 -- to pragma Ghost or when the corresponding spec is Ghost. Set
3659 -- the mode now to ensure that any nodes generated during analysis
3660 -- and expansion are properly marked as Ghost.
3662 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
3666 -- Previously we scanned the body to look for nested subprograms, and
3667 -- rejected an inline directive if nested subprograms were present,
3668 -- because the back-end would generate conflicting symbols for the
3669 -- nested bodies. This is now unnecessary.
3671 -- Look ahead to recognize a pragma Inline that appears after the body
3673 Check_Inline_Pragma
(Spec_Id
);
3675 -- Deal with special case of a fully private operation in the body of
3676 -- the protected type. We must create a declaration for the subprogram,
3677 -- in order to attach the protected subprogram that will be used in
3678 -- internal calls. We exclude compiler generated bodies from the
3679 -- expander since the issue does not arise for those cases.
3682 and then Comes_From_Source
(N
)
3683 and then Is_Protected_Type
(Current_Scope
)
3685 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
3688 -- If we are generating C and this is a function returning a constrained
3689 -- array type for which we must create a procedure with an extra out
3690 -- parameter, build and analyze the body now. The procedure declaration
3691 -- has already been created. We reuse the source body of the function,
3692 -- because in an instance it may contain global references that cannot
3693 -- be reanalyzed. The source function itself is not used any further,
3694 -- so we mark it as having a completion. If the subprogram is a stub the
3695 -- transformation is done later, when the proper body is analyzed.
3698 and then Modify_Tree_For_C
3699 and then Present
(Spec_Id
)
3700 and then Ekind
(Spec_Id
) = E_Function
3701 and then Nkind
(N
) /= N_Subprogram_Body_Stub
3702 and then Rewritten_For_C
(Spec_Id
)
3704 Set_Has_Completion
(Spec_Id
);
3706 Rewrite
(N
, Build_Procedure_Body_Form
(Spec_Id
, N
));
3709 -- The entity for the created procedure must remain invisible, so it
3710 -- does not participate in resolution of subsequent references to the
3713 Set_Is_Immediately_Visible
(Corresponding_Spec
(N
), False);
3717 -- If a separate spec is present, then deal with freezing issues
3719 if Present
(Spec_Id
) then
3720 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
3721 Verify_Overriding_Indicator
;
3723 -- In general, the spec will be frozen when we start analyzing the
3724 -- body. However, for internally generated operations, such as
3725 -- wrapper functions for inherited operations with controlling
3726 -- results, the spec may not have been frozen by the time we expand
3727 -- the freeze actions that include the bodies. In particular, extra
3728 -- formals for accessibility or for return-in-place may need to be
3729 -- generated. Freeze nodes, if any, are inserted before the current
3730 -- body. These freeze actions are also needed in ASIS mode and in
3731 -- Compile_Only mode to enable the proper back-end type annotations.
3732 -- They are necessary in any case to insure order of elaboration
3735 if not Is_Frozen
(Spec_Id
)
3736 and then (Expander_Active
3738 or else (Operating_Mode
= Check_Semantics
3739 and then Serious_Errors_Detected
= 0))
3741 -- The body generated for an expression function that is not a
3742 -- completion is a freeze point neither for the profile nor for
3743 -- anything else. That's why, in order to prevent any freezing
3744 -- during analysis, we need to mask types declared outside the
3745 -- expression that are not yet frozen.
3747 if Nkind
(N
) = N_Subprogram_Body
3748 and then Was_Expression_Function
(N
)
3749 and then not Has_Completion
(Spec_Id
)
3751 Set_Is_Frozen
(Spec_Id
);
3752 Mask_Types
:= Mask_Unfrozen_Types
(Spec_Id
);
3754 Set_Has_Delayed_Freeze
(Spec_Id
);
3755 Freeze_Before
(N
, Spec_Id
);
3760 -- If the subprogram has a class-wide clone, build its body as a copy
3761 -- of the original body, and rewrite body of original subprogram as a
3762 -- wrapper that calls the clone.
3764 if Present
(Spec_Id
)
3765 and then Present
(Class_Wide_Clone
(Spec_Id
))
3766 and then (Comes_From_Source
(N
) or else Was_Expression_Function
(N
))
3768 Build_Class_Wide_Clone_Body
(Spec_Id
, N
);
3770 -- This is the new body for the existing primitive operation
3772 Rewrite
(N
, Build_Class_Wide_Clone_Call
3773 (Sloc
(N
), New_List
, Spec_Id
, Parent
(Spec_Id
)));
3774 Set_Has_Completion
(Spec_Id
, False);
3779 -- Place subprogram on scope stack, and make formals visible. If there
3780 -- is a spec, the visible entity remains that of the spec.
3782 if Present
(Spec_Id
) then
3783 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
3785 if Is_Child_Unit
(Spec_Id
) then
3786 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
3790 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
3793 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
3794 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
3796 if Is_Abstract_Subprogram
(Spec_Id
) then
3797 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
3801 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
3802 Set_Has_Completion
(Spec_Id
);
3804 if Is_Protected_Type
(Scope
(Spec_Id
)) then
3805 Prot_Typ
:= Scope
(Spec_Id
);
3808 -- If this is a body generated for a renaming, do not check for
3809 -- full conformance. The check is redundant, because the spec of
3810 -- the body is a copy of the spec in the renaming declaration,
3811 -- and the test can lead to spurious errors on nested defaults.
3813 if Present
(Spec_Decl
)
3814 and then not Comes_From_Source
(N
)
3816 (Nkind
(Original_Node
(Spec_Decl
)) =
3817 N_Subprogram_Renaming_Declaration
3818 or else (Present
(Corresponding_Body
(Spec_Decl
))
3820 Nkind
(Unit_Declaration_Node
3821 (Corresponding_Body
(Spec_Decl
))) =
3822 N_Subprogram_Renaming_Declaration
))
3826 -- Conversely, the spec may have been generated for specless body
3827 -- with an inline pragma. The entity comes from source, which is
3828 -- both semantically correct and necessary for proper inlining.
3829 -- The subprogram declaration itself is not in the source.
3831 elsif Comes_From_Source
(N
)
3832 and then Present
(Spec_Decl
)
3833 and then not Comes_From_Source
(Spec_Decl
)
3834 and then Has_Pragma_Inline
(Spec_Id
)
3841 Fully_Conformant
, True, Conformant
, Body_Id
);
3844 -- If the body is not fully conformant, we have to decide if we
3845 -- should analyze it or not. If it has a really messed up profile
3846 -- then we probably should not analyze it, since we will get too
3847 -- many bogus messages.
3849 -- Our decision is to go ahead in the non-fully conformant case
3850 -- only if it is at least mode conformant with the spec. Note
3851 -- that the call to Check_Fully_Conformant has issued the proper
3852 -- error messages to complain about the lack of conformance.
3855 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
3861 if Spec_Id
/= Body_Id
then
3862 Reference_Body_Formals
(Spec_Id
, Body_Id
);
3865 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
3867 if Nkind
(N
) = N_Subprogram_Body_Stub
then
3868 Set_Corresponding_Spec_Of_Stub
(N
, Spec_Id
);
3873 Set_Corresponding_Spec
(N
, Spec_Id
);
3875 -- Ada 2005 (AI-345): If the operation is a primitive operation
3876 -- of a concurrent type, the type of the first parameter has been
3877 -- replaced with the corresponding record, which is the proper
3878 -- run-time structure to use. However, within the body there may
3879 -- be uses of the formals that depend on primitive operations
3880 -- of the type (in particular calls in prefixed form) for which
3881 -- we need the original concurrent type. The operation may have
3882 -- several controlling formals, so the replacement must be done
3885 if Comes_From_Source
(Spec_Id
)
3886 and then Present
(First_Entity
(Spec_Id
))
3887 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
3888 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
3889 and then Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
3890 and then Present
(Corresponding_Concurrent_Type
3891 (Etype
(First_Entity
(Spec_Id
))))
3894 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
3898 Form
:= First_Formal
(Spec_Id
);
3899 while Present
(Form
) loop
3900 if Etype
(Form
) = Typ
then
3901 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
3909 -- Make the formals visible, and place subprogram on scope stack.
3910 -- This is also the point at which we set Last_Real_Spec_Entity
3911 -- to mark the entities which will not be moved to the body.
3913 Install_Formals
(Spec_Id
);
3914 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
3916 -- Within an instance, add local renaming declarations so that
3917 -- gdb can retrieve the values of actuals more easily. This is
3918 -- only relevant if generating code (and indeed we definitely
3919 -- do not want these definitions -gnatc mode, because that would
3922 if Is_Generic_Instance
(Spec_Id
)
3923 and then Is_Wrapper_Package
(Current_Scope
)
3924 and then Expander_Active
3926 Build_Subprogram_Instance_Renamings
(N
, Current_Scope
);
3929 Push_Scope
(Spec_Id
);
3931 -- Make sure that the subprogram is immediately visible. For
3932 -- child units that have no separate spec this is indispensable.
3933 -- Otherwise it is safe albeit redundant.
3935 Set_Is_Immediately_Visible
(Spec_Id
);
3938 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
3939 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
3940 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
3942 -- Case of subprogram body with no previous spec
3945 -- Check for style warning required
3949 -- Only apply check for source level subprograms for which checks
3950 -- have not been suppressed.
3952 and then Comes_From_Source
(Body_Id
)
3953 and then not Suppress_Style_Checks
(Body_Id
)
3955 -- No warnings within an instance
3957 and then not In_Instance
3959 -- No warnings for expression functions
3961 and then Nkind
(Original_Node
(N
)) /= N_Expression_Function
3963 Style
.Body_With_No_Spec
(N
);
3966 New_Overloaded_Entity
(Body_Id
);
3968 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
3969 Set_Acts_As_Spec
(N
);
3970 Generate_Definition
(Body_Id
);
3972 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
3974 -- If the body is an entry wrapper created for an entry with
3975 -- preconditions, it must be compiled in the context of the
3976 -- enclosing synchronized object, because it may mention other
3977 -- operations of the type.
3979 if Is_Entry_Wrapper
(Body_Id
) then
3981 Prot
: constant Entity_Id
:= Etype
(First_Entity
(Body_Id
));
3984 Install_Declarations
(Prot
);
3988 Install_Formals
(Body_Id
);
3990 Push_Scope
(Body_Id
);
3993 -- For stubs and bodies with no previous spec, generate references to
3996 Generate_Reference_To_Formals
(Body_Id
);
3999 -- Entry barrier functions are generated outside the protected type and
4000 -- should not carry the SPARK_Mode of the enclosing context.
4002 if Nkind
(N
) = N_Subprogram_Body
4003 and then Is_Entry_Barrier_Function
(N
)
4007 -- The body is generated as part of expression function expansion. When
4008 -- the expression function appears in the visible declarations of a
4009 -- package, the body is added to the private declarations. Since both
4010 -- declarative lists may be subject to a different SPARK_Mode, inherit
4011 -- the mode of the spec.
4013 -- package P with SPARK_Mode is
4014 -- function Expr_Func ... is (...); -- original
4015 -- [function Expr_Func ...;] -- generated spec
4018 -- pragma SPARK_Mode (Off);
4019 -- [function Expr_Func ... is return ...;] -- generated body
4020 -- end P; -- mode is ON
4022 elsif not Comes_From_Source
(N
)
4023 and then Present
(Spec_Id
)
4024 and then Is_Expression_Function
(Spec_Id
)
4026 Set_SPARK_Pragma
(Body_Id
, SPARK_Pragma
(Spec_Id
));
4027 Set_SPARK_Pragma_Inherited
4028 (Body_Id
, SPARK_Pragma_Inherited
(Spec_Id
));
4030 -- Set the SPARK_Mode from the current context (may be overwritten later
4031 -- with explicit pragma). Exclude the case where the SPARK_Mode appears
4032 -- initially on a stand-alone subprogram body, but is then relocated to
4033 -- a generated corresponding spec. In this scenario the mode is shared
4034 -- between the spec and body.
4036 elsif No
(SPARK_Pragma
(Body_Id
)) then
4037 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
4038 Set_SPARK_Pragma_Inherited
(Body_Id
);
4041 -- A subprogram body may be instantiated or inlined at a later pass.
4042 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it
4043 -- applied to the initial declaration of the body.
4045 if Present
(Spec_Id
) then
4046 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
4047 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4051 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in
4052 -- case the body is instantiated or inlined later and out of context.
4053 -- The body uses this attribute to restore the value of the global
4056 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4057 Set_Ignore_SPARK_Mode_Pragmas
(Body_Id
);
4059 elsif Ignore_SPARK_Mode_Pragmas
(Body_Id
) then
4060 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4064 -- If this is the proper body of a stub, we must verify that the stub
4065 -- conforms to the body, and to the previous spec if one was present.
4066 -- We know already that the body conforms to that spec. This test is
4067 -- only required for subprograms that come from source.
4069 if Nkind
(Parent
(N
)) = N_Subunit
4070 and then Comes_From_Source
(N
)
4071 and then not Error_Posted
(Body_Id
)
4072 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
4073 N_Subprogram_Body_Stub
4076 Old_Id
: constant Entity_Id
:=
4078 (Specification
(Corresponding_Stub
(Parent
(N
))));
4080 Conformant
: Boolean := False;
4083 if No
(Spec_Id
) then
4084 Check_Fully_Conformant
(Body_Id
, Old_Id
);
4088 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
4090 if not Conformant
then
4092 -- The stub was taken to be a new declaration. Indicate that
4095 Set_Has_Completion
(Old_Id
, False);
4101 Set_Has_Completion
(Body_Id
);
4102 Check_Eliminated
(Body_Id
);
4104 -- Analyze any aspect specifications that appear on the subprogram body
4105 -- stub. Stop the analysis now as the stub does not have a declarative
4106 -- or a statement part, and it cannot be inlined.
4108 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4109 if Has_Aspects
(N
) then
4110 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4118 -- Note: Normally we don't do any inlining if expansion is off, since
4119 -- we won't generate code in any case. An exception arises in GNATprove
4120 -- mode where we want to expand some calls in place, even with expansion
4121 -- disabled, since the inlining eases formal verification.
4123 if not GNATprove_Mode
4124 and then Expander_Active
4125 and then Serious_Errors_Detected
= 0
4126 and then Present
(Spec_Id
)
4127 and then Has_Pragma_Inline
(Spec_Id
)
4129 -- Legacy implementation (relying on front-end inlining)
4131 if not Back_End_Inlining
then
4132 if (Has_Pragma_Inline_Always
(Spec_Id
)
4133 and then not Opt
.Disable_FE_Inline_Always
)
4134 or else (Front_End_Inlining
4135 and then not Opt
.Disable_FE_Inline
)
4137 Build_Body_To_Inline
(N
, Spec_Id
);
4140 -- New implementation (relying on back-end inlining)
4143 if Has_Pragma_Inline_Always
(Spec_Id
)
4144 or else Optimization_Level
> 0
4146 -- Handle function returning an unconstrained type
4148 if Comes_From_Source
(Body_Id
)
4149 and then Ekind
(Spec_Id
) = E_Function
4150 and then Returns_Unconstrained_Type
(Spec_Id
)
4152 -- If function builds in place, i.e. returns a limited type,
4153 -- inlining cannot be done.
4155 and then not Is_Limited_Type
(Etype
(Spec_Id
))
4157 Check_And_Split_Unconstrained_Function
(N
, Spec_Id
, Body_Id
);
4161 Subp_Body
: constant Node_Id
:=
4162 Unit_Declaration_Node
(Body_Id
);
4163 Subp_Decl
: constant List_Id
:= Declarations
(Subp_Body
);
4166 -- Do not pass inlining to the backend if the subprogram
4167 -- has declarations or statements which cannot be inlined
4168 -- by the backend. This check is done here to emit an
4169 -- error instead of the generic warning message reported
4170 -- by the GCC backend (ie. "function might not be
4173 if Present
(Subp_Decl
)
4174 and then Has_Excluded_Declaration
(Spec_Id
, Subp_Decl
)
4178 elsif Has_Excluded_Statement
4181 (Handled_Statement_Sequence
(Subp_Body
)))
4185 -- If the backend inlining is available then at this
4186 -- stage we only have to mark the subprogram as inlined.
4187 -- The expander will take care of registering it in the
4188 -- table of subprograms inlined by the backend a part of
4189 -- processing calls to it (cf. Expand_Call)
4192 Set_Is_Inlined
(Spec_Id
);
4199 -- In GNATprove mode, inline only when there is a separate subprogram
4200 -- declaration for now, as inlining of subprogram bodies acting as
4201 -- declarations, or subprogram stubs, are not supported by front-end
4202 -- inlining. This inlining should occur after analysis of the body, so
4203 -- that it is known whether the value of SPARK_Mode, which can be
4204 -- defined by a pragma inside the body, is applicable to the body.
4205 -- Inlining can be disabled with switch -gnatdm
4207 elsif GNATprove_Mode
4208 and then Full_Analysis
4209 and then not Inside_A_Generic
4210 and then Present
(Spec_Id
)
4212 Nkind
(Unit_Declaration_Node
(Spec_Id
)) = N_Subprogram_Declaration
4213 and then Body_Has_SPARK_Mode_On
4214 and then Can_Be_Inlined_In_GNATprove_Mode
(Spec_Id
, Body_Id
)
4215 and then not Body_Has_Contract
4216 and then not Debug_Flag_M
4218 Build_Body_To_Inline
(N
, Spec_Id
);
4221 -- When generating code, inherited pre/postconditions are handled when
4222 -- expanding the corresponding contract.
4224 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
4225 -- of the specification we have to install the private withed units.
4226 -- This holds for child units as well.
4228 if Is_Compilation_Unit
(Body_Id
)
4229 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
4231 Install_Private_With_Clauses
(Body_Id
);
4234 Check_Anonymous_Return
;
4236 -- Set the Protected_Formal field of each extra formal of the protected
4237 -- subprogram to reference the corresponding extra formal of the
4238 -- subprogram that implements it. For regular formals this occurs when
4239 -- the protected subprogram's declaration is expanded, but the extra
4240 -- formals don't get created until the subprogram is frozen. We need to
4241 -- do this before analyzing the protected subprogram's body so that any
4242 -- references to the original subprogram's extra formals will be changed
4243 -- refer to the implementing subprogram's formals (see Expand_Formal).
4245 if Present
(Spec_Id
)
4246 and then Is_Protected_Type
(Scope
(Spec_Id
))
4247 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
4250 Impl_Subp
: constant Entity_Id
:=
4251 Protected_Body_Subprogram
(Spec_Id
);
4252 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
4253 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
4256 while Present
(Prot_Ext_Formal
) loop
4257 pragma Assert
(Present
(Impl_Ext_Formal
));
4258 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
4259 Next_Formal_With_Extras
(Prot_Ext_Formal
);
4260 Next_Formal_With_Extras
(Impl_Ext_Formal
);
4265 -- Now we can go on to analyze the body
4267 HSS
:= Handled_Statement_Sequence
(N
);
4268 Set_Actual_Subtypes
(N
, Current_Scope
);
4270 -- Add a declaration for the Protection object, renaming declarations
4271 -- for discriminals and privals and finally a declaration for the entry
4272 -- family index (if applicable). This form of early expansion is done
4273 -- when the Expander is active because Install_Private_Data_Declarations
4274 -- references entities which were created during regular expansion. The
4275 -- subprogram entity must come from source, and not be an internally
4276 -- generated subprogram.
4279 and then Present
(Prot_Typ
)
4280 and then Present
(Spec_Id
)
4281 and then Comes_From_Source
(Spec_Id
)
4282 and then not Is_Eliminated
(Spec_Id
)
4284 Install_Private_Data_Declarations
4285 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
4288 -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context
4289 -- may now appear in parameter and result profiles. Since the analysis
4290 -- of a subprogram body may use the parameter and result profile of the
4291 -- spec, swap any limited views with their non-limited counterpart.
4293 if Ada_Version
>= Ada_2012
and then Present
(Spec_Id
) then
4294 Exch_Views
:= Exchange_Limited_Views
(Spec_Id
);
4297 -- If the return type is an anonymous access type whose designated type
4298 -- is the limited view of a class-wide type and the non-limited view is
4299 -- available, update the return type accordingly.
4301 if Ada_Version
>= Ada_2005
and then Present
(Spec_Id
) then
4307 Rtyp
:= Etype
(Spec_Id
);
4309 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
4310 Etyp
:= Directly_Designated_Type
(Rtyp
);
4312 if Is_Class_Wide_Type
(Etyp
)
4313 and then From_Limited_With
(Etyp
)
4316 Set_Directly_Designated_Type
(Rtyp
, Available_View
(Etyp
));
4322 -- Analyze any aspect specifications that appear on the subprogram body
4324 if Has_Aspects
(N
) then
4325 Analyze_Aspect_Specifications_On_Body_Or_Stub
(N
);
4328 Analyze_Declarations
(Declarations
(N
));
4330 -- Verify that the SPARK_Mode of the body agrees with that of its spec
4332 if Present
(Spec_Id
) and then Present
(SPARK_Pragma
(Body_Id
)) then
4333 if Present
(SPARK_Pragma
(Spec_Id
)) then
4334 if Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Spec_Id
)) = Off
4336 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
4338 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4339 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
4340 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Spec_Id
));
4342 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
4345 elsif Nkind
(Parent
(Parent
(Spec_Id
))) = N_Subprogram_Body_Stub
then
4349 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
4350 Error_Msg_N
("incorrect application of SPARK_Mode #", N
);
4351 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
4353 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
4357 -- A subprogram body "freezes" its own contract. Analyze the contract
4358 -- after the declarations of the body have been processed as pragmas
4359 -- are now chained on the contract of the subprogram body.
4361 Analyze_Entry_Or_Subprogram_Body_Contract
(Body_Id
);
4363 -- Check completion, and analyze the statements
4366 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
4369 -- Deal with end of scope processing for the body
4371 Process_End_Label
(HSS
, 't', Current_Scope
);
4372 Update_Use_Clause_Chain
;
4375 -- If we are compiling an entry wrapper, remove the enclosing
4376 -- synchronized object from the stack.
4378 if Is_Entry_Wrapper
(Body_Id
) then
4382 Check_Subprogram_Order
(N
);
4383 Set_Analyzed
(Body_Id
);
4385 -- If we have a separate spec, then the analysis of the declarations
4386 -- caused the entities in the body to be chained to the spec id, but
4387 -- we want them chained to the body id. Only the formal parameters
4388 -- end up chained to the spec id in this case.
4390 if Present
(Spec_Id
) then
4392 -- We must conform to the categorization of our spec
4394 Validate_Categorization_Dependency
(N
, Spec_Id
);
4396 -- And if this is a child unit, the parent units must conform
4398 if Is_Child_Unit
(Spec_Id
) then
4399 Validate_Categorization_Dependency
4400 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
4403 -- Here is where we move entities from the spec to the body
4405 -- Case where there are entities that stay with the spec
4407 if Present
(Last_Real_Spec_Entity
) then
4409 -- No body entities (happens when the only real spec entities come
4410 -- from precondition and postcondition pragmas).
4412 if No
(Last_Entity
(Body_Id
)) then
4413 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
4415 -- Body entities present (formals), so chain stuff past them
4419 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
4422 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
4423 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4424 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
4426 -- Case where there are no spec entities, in this case there can be
4427 -- no body entities either, so just move everything.
4429 -- If the body is generated for an expression function, it may have
4430 -- been preanalyzed already, if 'access was applied to it.
4433 if Nkind
(Original_Node
(Unit_Declaration_Node
(Spec_Id
))) /=
4434 N_Expression_Function
4436 pragma Assert
(No
(Last_Entity
(Body_Id
)));
4440 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
4441 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
4442 Set_First_Entity
(Spec_Id
, Empty
);
4443 Set_Last_Entity
(Spec_Id
, Empty
);
4447 Check_Missing_Return
;
4449 -- Now we are going to check for variables that are never modified in
4450 -- the body of the procedure. But first we deal with a special case
4451 -- where we want to modify this check. If the body of the subprogram
4452 -- starts with a raise statement or its equivalent, or if the body
4453 -- consists entirely of a null statement, then it is pretty obvious that
4454 -- it is OK to not reference the parameters. For example, this might be
4455 -- the following common idiom for a stubbed function: statement of the
4456 -- procedure raises an exception. In particular this deals with the
4457 -- common idiom of a stubbed function, which appears something like:
4459 -- function F (A : Integer) return Some_Type;
4462 -- raise Program_Error;
4466 -- Here the purpose of X is simply to satisfy the annoying requirement
4467 -- in Ada that there be at least one return, and we certainly do not
4468 -- want to go posting warnings on X that it is not initialized. On
4469 -- the other hand, if X is entirely unreferenced that should still
4472 -- What we do is to detect these cases, and if we find them, flag the
4473 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
4474 -- suppress unwanted warnings. For the case of the function stub above
4475 -- we have a special test to set X as apparently assigned to suppress
4482 -- Skip call markers installed by the ABE mechanism, labels, and
4483 -- Push_xxx_Error_Label to find the first real statement.
4485 Stm
:= First
(Statements
(HSS
));
4486 while Nkind_In
(Stm
, N_Call_Marker
, N_Label
)
4487 or else Nkind
(Stm
) in N_Push_xxx_Label
4492 -- Do the test on the original statement before expansion
4495 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
4498 -- If explicit raise statement, turn on flag
4500 if Nkind
(Ostm
) = N_Raise_Statement
then
4501 Set_Trivial_Subprogram
(Stm
);
4503 -- If null statement, and no following statements, turn on flag
4505 elsif Nkind
(Stm
) = N_Null_Statement
4506 and then Comes_From_Source
(Stm
)
4507 and then No
(Next
(Stm
))
4509 Set_Trivial_Subprogram
(Stm
);
4511 -- Check for explicit call cases which likely raise an exception
4513 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
4514 if Is_Entity_Name
(Name
(Ostm
)) then
4516 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
4519 -- If the procedure is marked No_Return, then likely it
4520 -- raises an exception, but in any case it is not coming
4521 -- back here, so turn on the flag.
4524 and then Ekind
(Ent
) = E_Procedure
4525 and then No_Return
(Ent
)
4527 Set_Trivial_Subprogram
(Stm
);
4535 -- Check for variables that are never modified
4542 -- If there is a separate spec, then transfer Never_Set_In_Source
4543 -- flags from out parameters to the corresponding entities in the
4544 -- body. The reason we do that is we want to post error flags on
4545 -- the body entities, not the spec entities.
4547 if Present
(Spec_Id
) then
4548 E1
:= First_Entity
(Spec_Id
);
4549 while Present
(E1
) loop
4550 if Ekind
(E1
) = E_Out_Parameter
then
4551 E2
:= First_Entity
(Body_Id
);
4552 while Present
(E2
) loop
4553 exit when Chars
(E1
) = Chars
(E2
);
4557 if Present
(E2
) then
4558 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
4566 -- Check references in body
4568 Check_References
(Body_Id
);
4571 -- Check for nested subprogram, and mark outer level subprogram if so
4577 if Present
(Spec_Id
) then
4584 Ent
:= Enclosing_Subprogram
(Ent
);
4585 exit when No
(Ent
) or else Is_Subprogram
(Ent
);
4588 if Present
(Ent
) then
4589 Set_Has_Nested_Subprogram
(Ent
);
4593 -- Restore the limited views in the spec, if any, to let the back end
4594 -- process it without running into circularities.
4596 if Exch_Views
/= No_Elist
then
4597 Restore_Limited_Views
(Exch_Views
);
4600 if Mask_Types
/= No_Elist
then
4601 Unmask_Unfrozen_Types
(Mask_Types
);
4604 if Present
(Desig_View
) then
4605 Set_Directly_Designated_Type
(Etype
(Spec_Id
), Desig_View
);
4609 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4610 Restore_Ghost_Mode
(Saved_GM
);
4611 end Analyze_Subprogram_Body_Helper
;
4613 ------------------------------------
4614 -- Analyze_Subprogram_Declaration --
4615 ------------------------------------
4617 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
4618 Scop
: constant Entity_Id
:= Current_Scope
;
4619 Designator
: Entity_Id
;
4621 Is_Completion
: Boolean;
4622 -- Indicates whether a null procedure declaration is a completion
4625 -- Null procedures are not allowed in SPARK
4627 if Nkind
(Specification
(N
)) = N_Procedure_Specification
4628 and then Null_Present
(Specification
(N
))
4630 Check_SPARK_05_Restriction
("null procedure is not allowed", N
);
4632 -- Null procedures are allowed in protected types, following the
4633 -- recent AI12-0147.
4635 if Is_Protected_Type
(Current_Scope
)
4636 and then Ada_Version
< Ada_2012
4638 Error_Msg_N
("protected operation cannot be a null procedure", N
);
4641 Analyze_Null_Procedure
(N
, Is_Completion
);
4643 -- The null procedure acts as a body, nothing further is needed
4645 if Is_Completion
then
4650 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
4652 -- A reference may already have been generated for the unit name, in
4653 -- which case the following call is redundant. However it is needed for
4654 -- declarations that are the rewriting of an expression function.
4656 Generate_Definition
(Designator
);
4658 -- Set the SPARK mode from the current context (may be overwritten later
4659 -- with explicit pragma). This is not done for entry barrier functions
4660 -- because they are generated outside the protected type and should not
4661 -- carry the mode of the enclosing context.
4663 if Nkind
(N
) = N_Subprogram_Declaration
4664 and then Is_Entry_Barrier_Function
(N
)
4669 Set_SPARK_Pragma
(Designator
, SPARK_Mode_Pragma
);
4670 Set_SPARK_Pragma_Inherited
(Designator
);
4673 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
4674 -- the body of this subprogram is instantiated or inlined later and out
4675 -- of context. The body uses this attribute to restore the value of the
4678 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
4679 Set_Ignore_SPARK_Mode_Pragmas
(Designator
);
4682 -- Preserve relevant elaboration-related attributes of the context which
4683 -- are no longer available or very expensive to recompute once analysis,
4684 -- resolution, and expansion are over.
4686 Mark_Elaboration_Attributes
4687 (N_Id
=> Designator
,
4690 if Debug_Flag_C
then
4691 Write_Str
("==> subprogram spec ");
4692 Write_Name
(Chars
(Designator
));
4693 Write_Str
(" from ");
4694 Write_Location
(Sloc
(N
));
4699 Validate_RCI_Subprogram_Declaration
(N
);
4700 New_Overloaded_Entity
(Designator
);
4701 Check_Delayed_Subprogram
(Designator
);
4703 -- If the type of the first formal of the current subprogram is a non-
4704 -- generic tagged private type, mark the subprogram as being a private
4705 -- primitive. Ditto if this is a function with controlling result, and
4706 -- the return type is currently private. In both cases, the type of the
4707 -- controlling argument or result must be in the current scope for the
4708 -- operation to be primitive.
4710 if Has_Controlling_Result
(Designator
)
4711 and then Is_Private_Type
(Etype
(Designator
))
4712 and then Scope
(Etype
(Designator
)) = Current_Scope
4713 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
4715 Set_Is_Private_Primitive
(Designator
);
4717 elsif Present
(First_Formal
(Designator
)) then
4719 Formal_Typ
: constant Entity_Id
:=
4720 Etype
(First_Formal
(Designator
));
4722 Set_Is_Private_Primitive
(Designator
,
4723 Is_Tagged_Type
(Formal_Typ
)
4724 and then Scope
(Formal_Typ
) = Current_Scope
4725 and then Is_Private_Type
(Formal_Typ
)
4726 and then not Is_Generic_Actual_Type
(Formal_Typ
));
4730 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
4733 if Ada_Version
>= Ada_2005
4734 and then Comes_From_Source
(N
)
4735 and then Is_Dispatching_Operation
(Designator
)
4742 if Has_Controlling_Result
(Designator
) then
4743 Etyp
:= Etype
(Designator
);
4746 E
:= First_Entity
(Designator
);
4748 and then Is_Formal
(E
)
4749 and then not Is_Controlling_Formal
(E
)
4757 if Is_Access_Type
(Etyp
) then
4758 Etyp
:= Directly_Designated_Type
(Etyp
);
4761 if Is_Interface
(Etyp
)
4762 and then not Is_Abstract_Subprogram
(Designator
)
4763 and then not (Ekind
(Designator
) = E_Procedure
4764 and then Null_Present
(Specification
(N
)))
4766 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
4768 -- Specialize error message based on procedures vs. functions,
4769 -- since functions can't be null subprograms.
4771 if Ekind
(Designator
) = E_Procedure
then
4773 ("interface procedure % must be abstract or null", N
);
4776 ("interface function % must be abstract", N
);
4782 -- What is the following code for, it used to be
4784 -- ??? Set_Suppress_Elaboration_Checks
4785 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
4787 -- The following seems equivalent, but a bit dubious
4789 if Elaboration_Checks_Suppressed
(Designator
) then
4790 Set_Kill_Elaboration_Checks
(Designator
);
4793 if Scop
/= Standard_Standard
and then not Is_Child_Unit
(Designator
) then
4794 Set_Categorization_From_Scope
(Designator
, Scop
);
4797 -- For a compilation unit, check for library-unit pragmas
4799 Push_Scope
(Designator
);
4800 Set_Categorization_From_Pragmas
(N
);
4801 Validate_Categorization_Dependency
(N
, Designator
);
4805 -- For a compilation unit, set body required. This flag will only be
4806 -- reset if a valid Import or Interface pragma is processed later on.
4808 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4809 Set_Body_Required
(Parent
(N
), True);
4811 if Ada_Version
>= Ada_2005
4812 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
4813 and then Null_Present
(Specification
(N
))
4816 ("null procedure cannot be declared at library level", N
);
4820 Generate_Reference_To_Formals
(Designator
);
4821 Check_Eliminated
(Designator
);
4823 if Debug_Flag_C
then
4825 Write_Str
("<== subprogram spec ");
4826 Write_Name
(Chars
(Designator
));
4827 Write_Str
(" from ");
4828 Write_Location
(Sloc
(N
));
4832 if Is_Protected_Type
(Current_Scope
) then
4834 -- Indicate that this is a protected operation, because it may be
4835 -- used in subsequent declarations within the protected type.
4837 Set_Convention
(Designator
, Convention_Protected
);
4840 List_Inherited_Pre_Post_Aspects
(Designator
);
4842 if Has_Aspects
(N
) then
4843 Analyze_Aspect_Specifications
(N
, Designator
);
4845 end Analyze_Subprogram_Declaration
;
4847 --------------------------------------
4848 -- Analyze_Subprogram_Specification --
4849 --------------------------------------
4851 -- Reminder: N here really is a subprogram specification (not a subprogram
4852 -- declaration). This procedure is called to analyze the specification in
4853 -- both subprogram bodies and subprogram declarations (specs).
4855 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
4856 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean;
4857 -- Determine whether entity E denotes the spec or body of an invariant
4860 ------------------------------------
4861 -- Is_Invariant_Procedure_Or_Body --
4862 ------------------------------------
4864 function Is_Invariant_Procedure_Or_Body
(E
: Entity_Id
) return Boolean is
4865 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
4869 if Nkind
(Decl
) = N_Subprogram_Body
then
4870 Spec
:= Corresponding_Spec
(Decl
);
4877 and then Ekind
(Spec
) = E_Procedure
4878 and then (Is_Partial_Invariant_Procedure
(Spec
)
4879 or else Is_Invariant_Procedure
(Spec
));
4880 end Is_Invariant_Procedure_Or_Body
;
4884 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
4885 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
4887 -- Start of processing for Analyze_Subprogram_Specification
4890 -- User-defined operator is not allowed in SPARK, except as a renaming
4892 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Operator_Symbol
4893 and then Nkind
(Parent
(N
)) /= N_Subprogram_Renaming_Declaration
4895 Check_SPARK_05_Restriction
4896 ("user-defined operator is not allowed", N
);
4899 -- Proceed with analysis. Do not emit a cross-reference entry if the
4900 -- specification comes from an expression function, because it may be
4901 -- the completion of a previous declaration. It is not, the cross-
4902 -- reference entry will be emitted for the new subprogram declaration.
4904 if Nkind
(Parent
(N
)) /= N_Expression_Function
then
4905 Generate_Definition
(Designator
);
4908 if Nkind
(N
) = N_Function_Specification
then
4909 Set_Ekind
(Designator
, E_Function
);
4910 Set_Mechanism
(Designator
, Default_Mechanism
);
4912 Set_Ekind
(Designator
, E_Procedure
);
4913 Set_Etype
(Designator
, Standard_Void_Type
);
4916 -- Flag Is_Inlined_Always is True by default, and reversed to False for
4917 -- those subprograms which could be inlined in GNATprove mode (because
4918 -- Body_To_Inline is non-Empty) but should not be inlined.
4920 if GNATprove_Mode
then
4921 Set_Is_Inlined_Always
(Designator
);
4924 -- Introduce new scope for analysis of the formals and the return type
4926 Set_Scope
(Designator
, Current_Scope
);
4928 if Present
(Formals
) then
4929 Push_Scope
(Designator
);
4930 Process_Formals
(Formals
, N
);
4932 -- Check dimensions in N for formals with default expression
4934 Analyze_Dimension_Formals
(N
, Formals
);
4936 -- Ada 2005 (AI-345): If this is an overriding operation of an
4937 -- inherited interface operation, and the controlling type is
4938 -- a synchronized type, replace the type with its corresponding
4939 -- record, to match the proper signature of an overriding operation.
4940 -- Same processing for an access parameter whose designated type is
4941 -- derived from a synchronized interface.
4943 -- This modification is not done for invariant procedures because
4944 -- the corresponding record may not necessarely be visible when the
4945 -- concurrent type acts as the full view of a private type.
4948 -- type Prot is private with Type_Invariant => ...;
4949 -- procedure ConcInvariant (Obj : Prot);
4951 -- protected type Prot is ...;
4952 -- type Concurrent_Record_Prot is record ...;
4953 -- procedure ConcInvariant (Obj : Prot) is
4955 -- end ConcInvariant;
4958 -- In the example above, both the spec and body of the invariant
4959 -- procedure must utilize the private type as the controlling type.
4961 if Ada_Version
>= Ada_2005
4962 and then not Is_Invariant_Procedure_Or_Body
(Designator
)
4966 Formal_Typ
: Entity_Id
;
4967 Rec_Typ
: Entity_Id
;
4968 Desig_Typ
: Entity_Id
;
4971 Formal
:= First_Formal
(Designator
);
4972 while Present
(Formal
) loop
4973 Formal_Typ
:= Etype
(Formal
);
4975 if Is_Concurrent_Type
(Formal_Typ
)
4976 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
4978 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
4980 if Present
(Interfaces
(Rec_Typ
)) then
4981 Set_Etype
(Formal
, Rec_Typ
);
4984 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
4985 Desig_Typ
:= Designated_Type
(Formal_Typ
);
4987 if Is_Concurrent_Type
(Desig_Typ
)
4988 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
4990 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
4992 if Present
(Interfaces
(Rec_Typ
)) then
4993 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
4998 Next_Formal
(Formal
);
5005 -- The subprogram scope is pushed and popped around the processing of
5006 -- the return type for consistency with call above to Process_Formals
5007 -- (which itself can call Analyze_Return_Type), and to ensure that any
5008 -- itype created for the return type will be associated with the proper
5011 elsif Nkind
(N
) = N_Function_Specification
then
5012 Push_Scope
(Designator
);
5013 Analyze_Return_Type
(N
);
5019 if Nkind
(N
) = N_Function_Specification
then
5021 -- Deal with operator symbol case
5023 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
5024 Valid_Operator_Definition
(Designator
);
5027 May_Need_Actuals
(Designator
);
5029 -- Ada 2005 (AI-251): If the return type is abstract, verify that
5030 -- the subprogram is abstract also. This does not apply to renaming
5031 -- declarations, where abstractness is inherited, and to subprogram
5032 -- bodies generated for stream operations, which become renamings as
5035 -- In case of primitives associated with abstract interface types
5036 -- the check is applied later (see Analyze_Subprogram_Declaration).
5038 if not Nkind_In
(Original_Node
(Parent
(N
)),
5039 N_Abstract_Subprogram_Declaration
,
5040 N_Formal_Abstract_Subprogram_Declaration
,
5041 N_Subprogram_Renaming_Declaration
)
5043 if Is_Abstract_Type
(Etype
(Designator
))
5044 and then not Is_Interface
(Etype
(Designator
))
5047 ("function that returns abstract type must be abstract", N
);
5049 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
5050 -- access result whose designated type is abstract.
5052 elsif Ada_Version
>= Ada_2012
5053 and then Nkind
(Result_Definition
(N
)) = N_Access_Definition
5055 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
5056 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
5059 ("function whose access result designates abstract type "
5060 & "must be abstract", N
);
5066 end Analyze_Subprogram_Specification
;
5068 -----------------------
5069 -- Check_Conformance --
5070 -----------------------
5072 procedure Check_Conformance
5073 (New_Id
: Entity_Id
;
5075 Ctype
: Conformance_Type
;
5077 Conforms
: out Boolean;
5078 Err_Loc
: Node_Id
:= Empty
;
5079 Get_Inst
: Boolean := False;
5080 Skip_Controlling_Formals
: Boolean := False)
5082 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
5083 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
5084 -- If Errmsg is True, then processing continues to post an error message
5085 -- for conformance error on given node. Two messages are output. The
5086 -- first message points to the previous declaration with a general "no
5087 -- conformance" message. The second is the detailed reason, supplied as
5088 -- Msg. The parameter N provide information for a possible & insertion
5089 -- in the message, and also provides the location for posting the
5090 -- message in the absence of a specified Err_Loc location.
5092 function Conventions_Match
5094 Id2
: Entity_Id
) return Boolean;
5095 -- Determine whether the conventions of arbitrary entities Id1 and Id2
5098 -----------------------
5099 -- Conformance_Error --
5100 -----------------------
5102 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
5109 if No
(Err_Loc
) then
5115 Error_Msg_Sloc
:= Sloc
(Old_Id
);
5118 when Type_Conformant
=>
5119 Error_Msg_N
-- CODEFIX
5120 ("not type conformant with declaration#!", Enode
);
5122 when Mode_Conformant
=>
5123 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5125 ("not mode conformant with operation inherited#!",
5129 ("not mode conformant with declaration#!", Enode
);
5132 when Subtype_Conformant
=>
5133 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5135 ("not subtype conformant with operation inherited#!",
5139 ("not subtype conformant with declaration#!", Enode
);
5142 when Fully_Conformant
=>
5143 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
5144 Error_Msg_N
-- CODEFIX
5145 ("not fully conformant with operation inherited#!",
5148 Error_Msg_N
-- CODEFIX
5149 ("not fully conformant with declaration#!", Enode
);
5153 Error_Msg_NE
(Msg
, Enode
, N
);
5155 end Conformance_Error
;
5157 -----------------------
5158 -- Conventions_Match --
5159 -----------------------
5161 function Conventions_Match
5163 Id2
: Entity_Id
) return Boolean
5166 -- Ignore the conventions of anonymous access-to-subprogram types
5167 -- and subprogram types because these are internally generated and
5168 -- the only way these may receive a convention is if they inherit
5169 -- the convention of a related subprogram.
5171 if Ekind_In
(Id1
, E_Anonymous_Access_Subprogram_Type
,
5174 Ekind_In
(Id2
, E_Anonymous_Access_Subprogram_Type
,
5179 -- Otherwise compare the conventions directly
5182 return Convention
(Id1
) = Convention
(Id2
);
5184 end Conventions_Match
;
5188 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
5189 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
5190 Old_Formal
: Entity_Id
;
5191 New_Formal
: Entity_Id
;
5192 Access_Types_Match
: Boolean;
5193 Old_Formal_Base
: Entity_Id
;
5194 New_Formal_Base
: Entity_Id
;
5196 -- Start of processing for Check_Conformance
5201 -- We need a special case for operators, since they don't appear
5204 if Ctype
= Type_Conformant
then
5205 if Ekind
(New_Id
) = E_Operator
5206 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
5212 -- If both are functions/operators, check return types conform
5214 if Old_Type
/= Standard_Void_Type
5216 New_Type
/= Standard_Void_Type
5218 -- If we are checking interface conformance we omit controlling
5219 -- arguments and result, because we are only checking the conformance
5220 -- of the remaining parameters.
5222 if Has_Controlling_Result
(Old_Id
)
5223 and then Has_Controlling_Result
(New_Id
)
5224 and then Skip_Controlling_Formals
5228 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
5229 if Ctype
>= Subtype_Conformant
5230 and then not Predicates_Match
(Old_Type
, New_Type
)
5233 ("\predicate of return type does not match!", New_Id
);
5236 ("\return type does not match!", New_Id
);
5242 -- Ada 2005 (AI-231): In case of anonymous access types check the
5243 -- null-exclusion and access-to-constant attributes match.
5245 if Ada_Version
>= Ada_2005
5246 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
5248 (Can_Never_Be_Null
(Old_Type
) /= Can_Never_Be_Null
(New_Type
)
5249 or else Is_Access_Constant
(Etype
(Old_Type
)) /=
5250 Is_Access_Constant
(Etype
(New_Type
)))
5252 Conformance_Error
("\return type does not match!", New_Id
);
5256 -- If either is a function/operator and the other isn't, error
5258 elsif Old_Type
/= Standard_Void_Type
5259 or else New_Type
/= Standard_Void_Type
5261 Conformance_Error
("\functions can only match functions!", New_Id
);
5265 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
5266 -- If this is a renaming as body, refine error message to indicate that
5267 -- the conflict is with the original declaration. If the entity is not
5268 -- frozen, the conventions don't have to match, the one of the renamed
5269 -- entity is inherited.
5271 if Ctype
>= Subtype_Conformant
then
5272 if not Conventions_Match
(Old_Id
, New_Id
) then
5273 if not Is_Frozen
(New_Id
) then
5276 elsif Present
(Err_Loc
)
5277 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
5278 and then Present
(Corresponding_Spec
(Err_Loc
))
5280 Error_Msg_Name_1
:= Chars
(New_Id
);
5282 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
5283 Conformance_Error
("\prior declaration for% has convention %!");
5286 Conformance_Error
("\calling conventions do not match!");
5291 elsif Is_Formal_Subprogram
(Old_Id
)
5292 or else Is_Formal_Subprogram
(New_Id
)
5294 Conformance_Error
("\formal subprograms not allowed!");
5299 -- Deal with parameters
5301 -- Note: we use the entity information, rather than going directly
5302 -- to the specification in the tree. This is not only simpler, but
5303 -- absolutely necessary for some cases of conformance tests between
5304 -- operators, where the declaration tree simply does not exist.
5306 Old_Formal
:= First_Formal
(Old_Id
);
5307 New_Formal
:= First_Formal
(New_Id
);
5308 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
5309 if Is_Controlling_Formal
(Old_Formal
)
5310 and then Is_Controlling_Formal
(New_Formal
)
5311 and then Skip_Controlling_Formals
5313 -- The controlling formals will have different types when
5314 -- comparing an interface operation with its match, but both
5315 -- or neither must be access parameters.
5317 if Is_Access_Type
(Etype
(Old_Formal
))
5319 Is_Access_Type
(Etype
(New_Formal
))
5321 goto Skip_Controlling_Formal
;
5324 ("\access parameter does not match!", New_Formal
);
5328 -- Ada 2012: Mode conformance also requires that formal parameters
5329 -- be both aliased, or neither.
5331 if Ctype
>= Mode_Conformant
and then Ada_Version
>= Ada_2012
then
5332 if Is_Aliased
(Old_Formal
) /= Is_Aliased
(New_Formal
) then
5334 ("\aliased parameter mismatch!", New_Formal
);
5338 if Ctype
= Fully_Conformant
then
5340 -- Names must match. Error message is more accurate if we do
5341 -- this before checking that the types of the formals match.
5343 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
5344 Conformance_Error
("\name& does not match!", New_Formal
);
5346 -- Set error posted flag on new formal as well to stop
5347 -- junk cascaded messages in some cases.
5349 Set_Error_Posted
(New_Formal
);
5353 -- Null exclusion must match
5355 if Null_Exclusion_Present
(Parent
(Old_Formal
))
5357 Null_Exclusion_Present
(Parent
(New_Formal
))
5359 -- Only give error if both come from source. This should be
5360 -- investigated some time, since it should not be needed ???
5362 if Comes_From_Source
(Old_Formal
)
5364 Comes_From_Source
(New_Formal
)
5367 ("\null exclusion for& does not match", New_Formal
);
5369 -- Mark error posted on the new formal to avoid duplicated
5370 -- complaint about types not matching.
5372 Set_Error_Posted
(New_Formal
);
5377 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
5378 -- case occurs whenever a subprogram is being renamed and one of its
5379 -- parameters imposes a null exclusion. For example:
5381 -- type T is null record;
5382 -- type Acc_T is access T;
5383 -- subtype Acc_T_Sub is Acc_T;
5385 -- procedure P (Obj : not null Acc_T_Sub); -- itype
5386 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
5389 Old_Formal_Base
:= Etype
(Old_Formal
);
5390 New_Formal_Base
:= Etype
(New_Formal
);
5393 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
5394 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
5397 Access_Types_Match
:= Ada_Version
>= Ada_2005
5399 -- Ensure that this rule is only applied when New_Id is a
5400 -- renaming of Old_Id.
5402 and then Nkind
(Parent
(Parent
(New_Id
))) =
5403 N_Subprogram_Renaming_Declaration
5404 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
5405 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
5406 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
5408 -- Now handle the allowed access-type case
5410 and then Is_Access_Type
(Old_Formal_Base
)
5411 and then Is_Access_Type
(New_Formal_Base
)
5413 -- The type kinds must match. The only exception occurs with
5414 -- multiple generics of the form:
5417 -- type F is private; type A is private;
5418 -- type F_Ptr is access F; type A_Ptr is access A;
5419 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
5420 -- package F_Pack is ... package A_Pack is
5421 -- package F_Inst is
5422 -- new F_Pack (A, A_Ptr, A_P);
5424 -- When checking for conformance between the parameters of A_P
5425 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
5426 -- because the compiler has transformed A_Ptr into a subtype of
5427 -- F_Ptr. We catch this case in the code below.
5429 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
5431 (Is_Generic_Type
(Old_Formal_Base
)
5432 and then Is_Generic_Type
(New_Formal_Base
)
5433 and then Is_Internal
(New_Formal_Base
)
5434 and then Etype
(Etype
(New_Formal_Base
)) =
5436 and then Directly_Designated_Type
(Old_Formal_Base
) =
5437 Directly_Designated_Type
(New_Formal_Base
)
5438 and then ((Is_Itype
(Old_Formal_Base
)
5439 and then Can_Never_Be_Null
(Old_Formal_Base
))
5441 (Is_Itype
(New_Formal_Base
)
5442 and then Can_Never_Be_Null
(New_Formal_Base
)));
5444 -- Types must always match. In the visible part of an instance,
5445 -- usual overloading rules for dispatching operations apply, and
5446 -- we check base types (not the actual subtypes).
5448 if In_Instance_Visible_Part
5449 and then Is_Dispatching_Operation
(New_Id
)
5451 if not Conforming_Types
5452 (T1
=> Base_Type
(Etype
(Old_Formal
)),
5453 T2
=> Base_Type
(Etype
(New_Formal
)),
5455 Get_Inst
=> Get_Inst
)
5456 and then not Access_Types_Match
5458 Conformance_Error
("\type of & does not match!", New_Formal
);
5462 elsif not Conforming_Types
5463 (T1
=> Old_Formal_Base
,
5464 T2
=> New_Formal_Base
,
5466 Get_Inst
=> Get_Inst
)
5467 and then not Access_Types_Match
5469 -- Don't give error message if old type is Any_Type. This test
5470 -- avoids some cascaded errors, e.g. in case of a bad spec.
5472 if Errmsg
and then Old_Formal_Base
= Any_Type
then
5475 if Ctype
>= Subtype_Conformant
5477 not Predicates_Match
(Old_Formal_Base
, New_Formal_Base
)
5480 ("\predicate of & does not match!", New_Formal
);
5483 ("\type of & does not match!", New_Formal
);
5485 if not Dimensions_Match
(Old_Formal_Base
, New_Formal_Base
)
5487 Error_Msg_N
("\dimensions mismatch!", New_Formal
);
5495 -- For mode conformance, mode must match
5497 if Ctype
>= Mode_Conformant
then
5498 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
5499 if not Ekind_In
(New_Id
, E_Function
, E_Procedure
)
5500 or else not Is_Primitive_Wrapper
(New_Id
)
5502 Conformance_Error
("\mode of & does not match!", New_Formal
);
5506 T
: constant Entity_Id
:= Find_Dispatching_Type
(New_Id
);
5508 if Is_Protected_Type
(Corresponding_Concurrent_Type
(T
))
5510 Error_Msg_PT
(New_Id
, Ultimate_Alias
(Old_Id
));
5513 ("\mode of & does not match!", New_Formal
);
5520 -- Part of mode conformance for access types is having the same
5521 -- constant modifier.
5523 elsif Access_Types_Match
5524 and then Is_Access_Constant
(Old_Formal_Base
) /=
5525 Is_Access_Constant
(New_Formal_Base
)
5528 ("\constant modifier does not match!", New_Formal
);
5533 if Ctype
>= Subtype_Conformant
then
5535 -- Ada 2005 (AI-231): In case of anonymous access types check
5536 -- the null-exclusion and access-to-constant attributes must
5537 -- match. For null exclusion, we test the types rather than the
5538 -- formals themselves, since the attribute is only set reliably
5539 -- on the formals in the Ada 95 case, and we exclude the case
5540 -- where Old_Formal is marked as controlling, to avoid errors
5541 -- when matching completing bodies with dispatching declarations
5542 -- (access formals in the bodies aren't marked Can_Never_Be_Null).
5544 if Ada_Version
>= Ada_2005
5545 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
5546 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
5548 ((Can_Never_Be_Null
(Etype
(Old_Formal
)) /=
5549 Can_Never_Be_Null
(Etype
(New_Formal
))
5551 not Is_Controlling_Formal
(Old_Formal
))
5553 Is_Access_Constant
(Etype
(Old_Formal
)) /=
5554 Is_Access_Constant
(Etype
(New_Formal
)))
5556 -- Do not complain if error already posted on New_Formal. This
5557 -- avoids some redundant error messages.
5559 and then not Error_Posted
(New_Formal
)
5561 -- It is allowed to omit the null-exclusion in case of stream
5562 -- attribute subprograms. We recognize stream subprograms
5563 -- through their TSS-generated suffix.
5566 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
5569 if TSS_Name
/= TSS_Stream_Read
5570 and then TSS_Name
/= TSS_Stream_Write
5571 and then TSS_Name
/= TSS_Stream_Input
5572 and then TSS_Name
/= TSS_Stream_Output
5574 -- Here we have a definite conformance error. It is worth
5575 -- special casing the error message for the case of a
5576 -- controlling formal (which excludes null).
5578 if Is_Controlling_Formal
(New_Formal
) then
5579 Error_Msg_Node_2
:= Scope
(New_Formal
);
5581 ("\controlling formal & of & excludes null, "
5582 & "declaration must exclude null as well",
5585 -- Normal case (couldn't we give more detail here???)
5589 ("\type of & does not match!", New_Formal
);
5598 -- Full conformance checks
5600 if Ctype
= Fully_Conformant
then
5602 -- We have checked already that names match
5604 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
5606 -- Check default expressions for in parameters
5609 NewD
: constant Boolean :=
5610 Present
(Default_Value
(New_Formal
));
5611 OldD
: constant Boolean :=
5612 Present
(Default_Value
(Old_Formal
));
5614 if NewD
or OldD
then
5616 -- The old default value has been analyzed because the
5617 -- current full declaration will have frozen everything
5618 -- before. The new default value has not been analyzed,
5619 -- so analyze it now before we check for conformance.
5622 Push_Scope
(New_Id
);
5623 Preanalyze_Spec_Expression
5624 (Default_Value
(New_Formal
), Etype
(New_Formal
));
5628 if not (NewD
and OldD
)
5629 or else not Fully_Conformant_Expressions
5630 (Default_Value
(Old_Formal
),
5631 Default_Value
(New_Formal
))
5634 ("\default expression for & does not match!",
5643 -- A couple of special checks for Ada 83 mode. These checks are
5644 -- skipped if either entity is an operator in package Standard,
5645 -- or if either old or new instance is not from the source program.
5647 if Ada_Version
= Ada_83
5648 and then Sloc
(Old_Id
) > Standard_Location
5649 and then Sloc
(New_Id
) > Standard_Location
5650 and then Comes_From_Source
(Old_Id
)
5651 and then Comes_From_Source
(New_Id
)
5654 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
5655 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
5658 -- Explicit IN must be present or absent in both cases. This
5659 -- test is required only in the full conformance case.
5661 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
5662 and then Ctype
= Fully_Conformant
5665 ("\(Ada 83) IN must appear in both declarations",
5670 -- Grouping (use of comma in param lists) must be the same
5671 -- This is where we catch a misconformance like:
5674 -- A : Integer; B : Integer
5676 -- which are represented identically in the tree except
5677 -- for the setting of the flags More_Ids and Prev_Ids.
5679 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
5680 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
5683 ("\grouping of & does not match!", New_Formal
);
5689 -- This label is required when skipping controlling formals
5691 <<Skip_Controlling_Formal
>>
5693 Next_Formal
(Old_Formal
);
5694 Next_Formal
(New_Formal
);
5697 if Present
(Old_Formal
) then
5698 Conformance_Error
("\too few parameters!");
5701 elsif Present
(New_Formal
) then
5702 Conformance_Error
("\too many parameters!", New_Formal
);
5705 end Check_Conformance
;
5707 -----------------------
5708 -- Check_Conventions --
5709 -----------------------
5711 procedure Check_Conventions
(Typ
: Entity_Id
) is
5712 Ifaces_List
: Elist_Id
;
5714 procedure Check_Convention
(Op
: Entity_Id
);
5715 -- Verify that the convention of inherited dispatching operation Op is
5716 -- consistent among all subprograms it overrides. In order to minimize
5717 -- the search, Search_From is utilized to designate a specific point in
5718 -- the list rather than iterating over the whole list once more.
5720 ----------------------
5721 -- Check_Convention --
5722 ----------------------
5724 procedure Check_Convention
(Op
: Entity_Id
) is
5725 Op_Conv
: constant Convention_Id
:= Convention
(Op
);
5726 Iface_Conv
: Convention_Id
;
5727 Iface_Elmt
: Elmt_Id
;
5728 Iface_Prim_Elmt
: Elmt_Id
;
5729 Iface_Prim
: Entity_Id
;
5732 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
5733 while Present
(Iface_Elmt
) loop
5735 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
5736 while Present
(Iface_Prim_Elmt
) loop
5737 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
5738 Iface_Conv
:= Convention
(Iface_Prim
);
5740 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
5741 and then Iface_Conv
/= Op_Conv
5744 ("inconsistent conventions in primitive operations", Typ
);
5746 Error_Msg_Name_1
:= Chars
(Op
);
5747 Error_Msg_Name_2
:= Get_Convention_Name
(Op_Conv
);
5748 Error_Msg_Sloc
:= Sloc
(Op
);
5750 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
5751 if not Present
(Overridden_Operation
(Op
)) then
5752 Error_Msg_N
("\\primitive % defined #", Typ
);
5755 ("\\overriding operation % with "
5756 & "convention % defined #", Typ
);
5759 else pragma Assert
(Present
(Alias
(Op
)));
5760 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
5761 Error_Msg_N
("\\inherited operation % with "
5762 & "convention % defined #", Typ
);
5765 Error_Msg_Name_1
:= Chars
(Op
);
5766 Error_Msg_Name_2
:= Get_Convention_Name
(Iface_Conv
);
5767 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
5768 Error_Msg_N
("\\overridden operation % with "
5769 & "convention % defined #", Typ
);
5771 -- Avoid cascading errors
5776 Next_Elmt
(Iface_Prim_Elmt
);
5779 Next_Elmt
(Iface_Elmt
);
5781 end Check_Convention
;
5785 Prim_Op
: Entity_Id
;
5786 Prim_Op_Elmt
: Elmt_Id
;
5788 -- Start of processing for Check_Conventions
5791 if not Has_Interfaces
(Typ
) then
5795 Collect_Interfaces
(Typ
, Ifaces_List
);
5797 -- The algorithm checks every overriding dispatching operation against
5798 -- all the corresponding overridden dispatching operations, detecting
5799 -- differences in conventions.
5801 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5802 while Present
(Prim_Op_Elmt
) loop
5803 Prim_Op
:= Node
(Prim_Op_Elmt
);
5805 -- A small optimization: skip the predefined dispatching operations
5806 -- since they always have the same convention.
5808 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
5809 Check_Convention
(Prim_Op
);
5812 Next_Elmt
(Prim_Op_Elmt
);
5814 end Check_Conventions
;
5816 ------------------------------
5817 -- Check_Delayed_Subprogram --
5818 ------------------------------
5820 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
5823 procedure Possible_Freeze
(T
: Entity_Id
);
5824 -- T is the type of either a formal parameter or of the return type.
5825 -- If T is not yet frozen and needs a delayed freeze, then the
5826 -- subprogram itself must be delayed.
5828 ---------------------
5829 -- Possible_Freeze --
5830 ---------------------
5832 procedure Possible_Freeze
(T
: Entity_Id
) is
5834 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
5835 Set_Has_Delayed_Freeze
(Designator
);
5837 elsif Is_Access_Type
(T
)
5838 and then Has_Delayed_Freeze
(Designated_Type
(T
))
5839 and then not Is_Frozen
(Designated_Type
(T
))
5841 Set_Has_Delayed_Freeze
(Designator
);
5844 end Possible_Freeze
;
5846 -- Start of processing for Check_Delayed_Subprogram
5849 -- All subprograms, including abstract subprograms, may need a freeze
5850 -- node if some formal type or the return type needs one.
5852 Possible_Freeze
(Etype
(Designator
));
5853 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
5855 -- Need delayed freeze if any of the formal types themselves need
5856 -- a delayed freeze and are not yet frozen.
5858 F
:= First_Formal
(Designator
);
5859 while Present
(F
) loop
5860 Possible_Freeze
(Etype
(F
));
5861 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
5865 -- Mark functions that return by reference. Note that it cannot be
5866 -- done for delayed_freeze subprograms because the underlying
5867 -- returned type may not be known yet (for private types)
5869 if not Has_Delayed_Freeze
(Designator
) and then Expander_Active
then
5871 Typ
: constant Entity_Id
:= Etype
(Designator
);
5872 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
5874 if Is_Limited_View
(Typ
) then
5875 Set_Returns_By_Ref
(Designator
);
5876 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
5877 Set_Returns_By_Ref
(Designator
);
5881 end Check_Delayed_Subprogram
;
5883 ------------------------------------
5884 -- Check_Discriminant_Conformance --
5885 ------------------------------------
5887 procedure Check_Discriminant_Conformance
5892 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
5893 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
5894 New_Discr_Id
: Entity_Id
;
5895 New_Discr_Type
: Entity_Id
;
5897 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
5898 -- Post error message for conformance error on given node. Two messages
5899 -- are output. The first points to the previous declaration with a
5900 -- general "no conformance" message. The second is the detailed reason,
5901 -- supplied as Msg. The parameter N provide information for a possible
5902 -- & insertion in the message.
5904 -----------------------
5905 -- Conformance_Error --
5906 -----------------------
5908 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
5910 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
5911 Error_Msg_N
-- CODEFIX
5912 ("not fully conformant with declaration#!", N
);
5913 Error_Msg_NE
(Msg
, N
, N
);
5914 end Conformance_Error
;
5916 -- Start of processing for Check_Discriminant_Conformance
5919 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
5920 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
5922 -- The subtype mark of the discriminant on the full type has not
5923 -- been analyzed so we do it here. For an access discriminant a new
5926 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
5928 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
5931 Analyze
(Discriminant_Type
(New_Discr
));
5932 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
5934 -- Ada 2005: if the discriminant definition carries a null
5935 -- exclusion, create an itype to check properly for consistency
5936 -- with partial declaration.
5938 if Is_Access_Type
(New_Discr_Type
)
5939 and then Null_Exclusion_Present
(New_Discr
)
5942 Create_Null_Excluding_Itype
5943 (T
=> New_Discr_Type
,
5944 Related_Nod
=> New_Discr
,
5945 Scope_Id
=> Current_Scope
);
5949 if not Conforming_Types
5950 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
5952 Conformance_Error
("type of & does not match!", New_Discr_Id
);
5955 -- Treat the new discriminant as an occurrence of the old one,
5956 -- for navigation purposes, and fill in some semantic
5957 -- information, for completeness.
5959 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
5960 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
5961 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
5966 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
5967 Conformance_Error
("name & does not match!", New_Discr_Id
);
5971 -- Default expressions must match
5974 NewD
: constant Boolean :=
5975 Present
(Expression
(New_Discr
));
5976 OldD
: constant Boolean :=
5977 Present
(Expression
(Parent
(Old_Discr
)));
5980 if NewD
or OldD
then
5982 -- The old default value has been analyzed and expanded,
5983 -- because the current full declaration will have frozen
5984 -- everything before. The new default values have not been
5985 -- expanded, so expand now to check conformance.
5988 Preanalyze_Spec_Expression
5989 (Expression
(New_Discr
), New_Discr_Type
);
5992 if not (NewD
and OldD
)
5993 or else not Fully_Conformant_Expressions
5994 (Expression
(Parent
(Old_Discr
)),
5995 Expression
(New_Discr
))
5999 ("default expression for & does not match!",
6006 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
6008 if Ada_Version
= Ada_83
then
6010 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
6013 -- Grouping (use of comma in param lists) must be the same
6014 -- This is where we catch a misconformance like:
6017 -- A : Integer; B : Integer
6019 -- which are represented identically in the tree except
6020 -- for the setting of the flags More_Ids and Prev_Ids.
6022 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
6023 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
6026 ("grouping of & does not match!", New_Discr_Id
);
6032 Next_Discriminant
(Old_Discr
);
6036 if Present
(Old_Discr
) then
6037 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
6040 elsif Present
(New_Discr
) then
6042 ("too many discriminants!", Defining_Identifier
(New_Discr
));
6045 end Check_Discriminant_Conformance
;
6047 ----------------------------
6048 -- Check_Fully_Conformant --
6049 ----------------------------
6051 procedure Check_Fully_Conformant
6052 (New_Id
: Entity_Id
;
6054 Err_Loc
: Node_Id
:= Empty
)
6057 pragma Warnings
(Off
, Result
);
6060 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
6061 end Check_Fully_Conformant
;
6063 --------------------------
6064 -- Check_Limited_Return --
6065 --------------------------
6067 procedure Check_Limited_Return
6073 -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and
6074 -- replaced by anonymous access results. This is an incompatibility with
6075 -- Ada 95. Not clear whether this should be enforced yet or perhaps
6076 -- controllable with special switch. ???
6078 -- A limited interface that is not immutably limited is OK
6080 if Is_Limited_Interface
(R_Type
)
6082 not (Is_Task_Interface
(R_Type
)
6083 or else Is_Protected_Interface
(R_Type
)
6084 or else Is_Synchronized_Interface
(R_Type
))
6088 elsif Is_Limited_Type
(R_Type
)
6089 and then not Is_Interface
(R_Type
)
6090 and then Comes_From_Source
(N
)
6091 and then not In_Instance_Body
6092 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
6094 -- Error in Ada 2005
6096 if Ada_Version
>= Ada_2005
6097 and then not Debug_Flag_Dot_L
6098 and then not GNAT_Mode
6101 ("(Ada 2005) cannot copy object of a limited type "
6102 & "(RM-2005 6.5(5.5/2))", Expr
);
6104 if Is_Limited_View
(R_Type
) then
6106 ("\return by reference not permitted in Ada 2005", Expr
);
6109 -- Warn in Ada 95 mode, to give folks a heads up about this
6112 -- In GNAT mode, this is just a warning, to allow it to be evilly
6113 -- turned off. Otherwise it is a real error.
6115 -- In a generic context, simplify the warning because it makes no
6116 -- sense to discuss pass-by-reference or copy.
6118 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
6119 if Inside_A_Generic
then
6121 ("return of limited object not permitted in Ada 2005 "
6122 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6124 elsif Is_Limited_View
(R_Type
) then
6126 ("return by reference not permitted in Ada 2005 "
6127 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6130 ("cannot copy object of a limited type in Ada 2005 "
6131 & "(RM-2005 6.5(5.5/2))?y?", Expr
);
6134 -- Ada 95 mode, and compatibility warnings disabled
6137 pragma Assert
(Ada_Version
<= Ada_95
);
6138 pragma Assert
(not (Warn_On_Ada_2005_Compatibility
or GNAT_Mode
));
6139 return; -- skip continuation messages below
6142 if not Inside_A_Generic
then
6144 ("\consider switching to return of access type", Expr
);
6145 Explain_Limited_Type
(R_Type
, Expr
);
6148 end Check_Limited_Return
;
6150 ---------------------------
6151 -- Check_Mode_Conformant --
6152 ---------------------------
6154 procedure Check_Mode_Conformant
6155 (New_Id
: Entity_Id
;
6157 Err_Loc
: Node_Id
:= Empty
;
6158 Get_Inst
: Boolean := False)
6161 pragma Warnings
(Off
, Result
);
6164 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
6165 end Check_Mode_Conformant
;
6167 --------------------------------
6168 -- Check_Overriding_Indicator --
6169 --------------------------------
6171 procedure Check_Overriding_Indicator
6173 Overridden_Subp
: Entity_Id
;
6174 Is_Primitive
: Boolean)
6180 -- No overriding indicator for literals
6182 if Ekind
(Subp
) = E_Enumeration_Literal
then
6185 elsif Ekind
(Subp
) = E_Entry
then
6186 Decl
:= Parent
(Subp
);
6188 -- No point in analyzing a malformed operator
6190 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
6191 and then Error_Posted
(Subp
)
6196 Decl
:= Unit_Declaration_Node
(Subp
);
6199 if Nkind_In
(Decl
, N_Subprogram_Body
,
6200 N_Subprogram_Body_Stub
,
6201 N_Subprogram_Declaration
,
6202 N_Abstract_Subprogram_Declaration
,
6203 N_Subprogram_Renaming_Declaration
)
6205 Spec
:= Specification
(Decl
);
6207 elsif Nkind
(Decl
) = N_Entry_Declaration
then
6214 -- The overriding operation is type conformant with the overridden one,
6215 -- but the names of the formals are not required to match. If the names
6216 -- appear permuted in the overriding operation, this is a possible
6217 -- source of confusion that is worth diagnosing. Controlling formals
6218 -- often carry names that reflect the type, and it is not worthwhile
6219 -- requiring that their names match.
6221 if Present
(Overridden_Subp
)
6222 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
6229 Form1
:= First_Formal
(Subp
);
6230 Form2
:= First_Formal
(Overridden_Subp
);
6232 -- If the overriding operation is a synchronized operation, skip
6233 -- the first parameter of the overridden operation, which is
6234 -- implicit in the new one. If the operation is declared in the
6235 -- body it is not primitive and all formals must match.
6237 if Is_Concurrent_Type
(Scope
(Subp
))
6238 and then Is_Tagged_Type
(Scope
(Subp
))
6239 and then not Has_Completion
(Scope
(Subp
))
6241 Form2
:= Next_Formal
(Form2
);
6244 if Present
(Form1
) then
6245 Form1
:= Next_Formal
(Form1
);
6246 Form2
:= Next_Formal
(Form2
);
6249 while Present
(Form1
) loop
6250 if not Is_Controlling_Formal
(Form1
)
6251 and then Present
(Next_Formal
(Form2
))
6252 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
6254 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
6255 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
6257 ("& does not match corresponding formal of&#",
6262 Next_Formal
(Form1
);
6263 Next_Formal
(Form2
);
6268 -- If there is an overridden subprogram, then check that there is no
6269 -- "not overriding" indicator, and mark the subprogram as overriding.
6270 -- This is not done if the overridden subprogram is marked as hidden,
6271 -- which can occur for the case of inherited controlled operations
6272 -- (see Derive_Subprogram), unless the inherited subprogram's parent
6273 -- subprogram is not itself hidden. (Note: This condition could probably
6274 -- be simplified, leaving out the testing for the specific controlled
6275 -- cases, but it seems safer and clearer this way, and echoes similar
6276 -- special-case tests of this kind in other places.)
6278 if Present
(Overridden_Subp
)
6279 and then (not Is_Hidden
(Overridden_Subp
)
6281 (Nam_In
(Chars
(Overridden_Subp
), Name_Initialize
,
6284 and then Present
(Alias
(Overridden_Subp
))
6285 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
6287 if Must_Not_Override
(Spec
) then
6288 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
6290 if Ekind
(Subp
) = E_Entry
then
6292 ("entry & overrides inherited operation #", Spec
, Subp
);
6295 ("subprogram & overrides inherited operation #", Spec
, Subp
);
6298 -- Special-case to fix a GNAT oddity: Limited_Controlled is declared
6299 -- as an extension of Root_Controlled, and thus has a useless Adjust
6300 -- operation. This operation should not be inherited by other limited
6301 -- controlled types. An explicit Adjust for them is not overriding.
6303 elsif Must_Override
(Spec
)
6304 and then Chars
(Overridden_Subp
) = Name_Adjust
6305 and then Is_Limited_Type
(Etype
(First_Formal
(Subp
)))
6306 and then Present
(Alias
(Overridden_Subp
))
6307 and then In_Predefined_Unit
(Alias
(Overridden_Subp
))
6310 (Unit_File_Name
(Get_Source_Unit
(Alias
(Overridden_Subp
))));
6311 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6313 elsif Is_Subprogram
(Subp
) then
6314 if Is_Init_Proc
(Subp
) then
6317 elsif No
(Overridden_Operation
(Subp
)) then
6319 -- For entities generated by Derive_Subprograms the overridden
6320 -- operation is the inherited primitive (which is available
6321 -- through the attribute alias)
6323 if (Is_Dispatching_Operation
(Subp
)
6324 or else Is_Dispatching_Operation
(Overridden_Subp
))
6325 and then not Comes_From_Source
(Overridden_Subp
)
6326 and then Find_Dispatching_Type
(Overridden_Subp
) =
6327 Find_Dispatching_Type
(Subp
)
6328 and then Present
(Alias
(Overridden_Subp
))
6329 and then Comes_From_Source
(Alias
(Overridden_Subp
))
6331 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
6332 Inherit_Subprogram_Contract
(Subp
, Alias
(Overridden_Subp
));
6335 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
6336 Inherit_Subprogram_Contract
(Subp
, Overridden_Subp
);
6341 -- If primitive flag is set or this is a protected operation, then
6342 -- the operation is overriding at the point of its declaration, so
6343 -- warn if necessary. Otherwise it may have been declared before the
6344 -- operation it overrides and no check is required.
6347 and then not Must_Override
(Spec
)
6348 and then (Is_Primitive
6349 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
6351 Style
.Missing_Overriding
(Decl
, Subp
);
6354 -- If Subp is an operator, it may override a predefined operation, if
6355 -- it is defined in the same scope as the type to which it applies.
6356 -- In that case Overridden_Subp is empty because of our implicit
6357 -- representation for predefined operators. We have to check whether the
6358 -- signature of Subp matches that of a predefined operator. Note that
6359 -- first argument provides the name of the operator, and the second
6360 -- argument the signature that may match that of a standard operation.
6361 -- If the indicator is overriding, then the operator must match a
6362 -- predefined signature, because we know already that there is no
6363 -- explicit overridden operation.
6365 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
6366 if Must_Not_Override
(Spec
) then
6368 -- If this is not a primitive or a protected subprogram, then
6369 -- "not overriding" is illegal.
6372 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6374 Error_Msg_N
("overriding indicator only allowed "
6375 & "if subprogram is primitive", Subp
);
6377 elsif Can_Override_Operator
(Subp
) then
6379 ("subprogram& overrides predefined operator ", Spec
, Subp
);
6382 elsif Must_Override
(Spec
) then
6383 if No
(Overridden_Operation
(Subp
))
6384 and then not Can_Override_Operator
(Subp
)
6386 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6389 elsif not Error_Posted
(Subp
)
6390 and then Style_Check
6391 and then Can_Override_Operator
(Subp
)
6392 and then not In_Predefined_Unit
(Subp
)
6394 -- If style checks are enabled, indicate that the indicator is
6395 -- missing. However, at the point of declaration, the type of
6396 -- which this is a primitive operation may be private, in which
6397 -- case the indicator would be premature.
6399 if Has_Private_Declaration
(Etype
(Subp
))
6400 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
6404 Style
.Missing_Overriding
(Decl
, Subp
);
6408 elsif Must_Override
(Spec
) then
6409 if Ekind
(Subp
) = E_Entry
then
6410 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
6412 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
6415 -- If the operation is marked "not overriding" and it's not primitive
6416 -- then an error is issued, unless this is an operation of a task or
6417 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
6418 -- has been specified have already been checked above.
6420 elsif Must_Not_Override
(Spec
)
6421 and then not Is_Primitive
6422 and then Ekind
(Subp
) /= E_Entry
6423 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
6426 ("overriding indicator only allowed if subprogram is primitive",
6430 end Check_Overriding_Indicator
;
6436 -- Note: this procedure needs to know far too much about how the expander
6437 -- messes with exceptions. The use of the flag Exception_Junk and the
6438 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
6439 -- works, but is not very clean. It would be better if the expansion
6440 -- routines would leave Original_Node working nicely, and we could use
6441 -- Original_Node here to ignore all the peculiar expander messing ???
6443 procedure Check_Returns
6447 Proc
: Entity_Id
:= Empty
)
6451 procedure Check_Statement_Sequence
(L
: List_Id
);
6452 -- Internal recursive procedure to check a list of statements for proper
6453 -- termination by a return statement (or a transfer of control or a
6454 -- compound statement that is itself internally properly terminated).
6456 ------------------------------
6457 -- Check_Statement_Sequence --
6458 ------------------------------
6460 procedure Check_Statement_Sequence
(L
: List_Id
) is
6465 function Assert_False
return Boolean;
6466 -- Returns True if Last_Stm is a pragma Assert (False) that has been
6467 -- rewritten as a null statement when assertions are off. The assert
6468 -- is not active, but it is still enough to kill the warning.
6474 function Assert_False
return Boolean is
6475 Orig
: constant Node_Id
:= Original_Node
(Last_Stm
);
6478 if Nkind
(Orig
) = N_Pragma
6479 and then Pragma_Name
(Orig
) = Name_Assert
6480 and then not Error_Posted
(Orig
)
6483 Arg
: constant Node_Id
:=
6484 First
(Pragma_Argument_Associations
(Orig
));
6485 Exp
: constant Node_Id
:= Expression
(Arg
);
6487 return Nkind
(Exp
) = N_Identifier
6488 and then Chars
(Exp
) = Name_False
;
6498 Raise_Exception_Call
: Boolean;
6499 -- Set True if statement sequence terminated by Raise_Exception call
6500 -- or a Reraise_Occurrence call.
6502 -- Start of processing for Check_Statement_Sequence
6505 Raise_Exception_Call
:= False;
6507 -- Get last real statement
6509 Last_Stm
:= Last
(L
);
6511 -- Deal with digging out exception handler statement sequences that
6512 -- have been transformed by the local raise to goto optimization.
6513 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
6514 -- optimization has occurred, we are looking at something like:
6517 -- original stmts in block
6521 -- goto L1; | omitted if No_Exception_Propagation
6526 -- goto L3; -- skip handler when exception not raised
6528 -- <<L1>> -- target label for local exception
6542 -- and what we have to do is to dig out the estmts1 and estmts2
6543 -- sequences (which were the original sequences of statements in
6544 -- the exception handlers) and check them.
6546 if Nkind
(Last_Stm
) = N_Label
and then Exception_Junk
(Last_Stm
) then
6551 exit when Nkind
(Stm
) /= N_Block_Statement
;
6552 exit when not Exception_Junk
(Stm
);
6555 exit when Nkind
(Stm
) /= N_Label
;
6556 exit when not Exception_Junk
(Stm
);
6557 Check_Statement_Sequence
6558 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
6563 exit when Nkind
(Stm
) /= N_Goto_Statement
;
6564 exit when not Exception_Junk
(Stm
);
6568 -- Don't count pragmas
6570 while Nkind
(Last_Stm
) = N_Pragma
6572 -- Don't count call to SS_Release (can happen after Raise_Exception)
6575 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
6577 Nkind
(Name
(Last_Stm
)) = N_Identifier
6579 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
6581 -- Don't count exception junk
6584 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
6586 N_Object_Declaration
)
6587 and then Exception_Junk
(Last_Stm
))
6588 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
6589 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
6591 -- Inserted code, such as finalization calls, is irrelevant: we only
6592 -- need to check original source.
6594 or else Is_Rewrite_Insertion
(Last_Stm
)
6599 -- Here we have the "real" last statement
6601 Kind
:= Nkind
(Last_Stm
);
6603 -- Transfer of control, OK. Note that in the No_Return procedure
6604 -- case, we already diagnosed any explicit return statements, so
6605 -- we can treat them as OK in this context.
6607 if Is_Transfer
(Last_Stm
) then
6610 -- Check cases of explicit non-indirect procedure calls
6612 elsif Kind
= N_Procedure_Call_Statement
6613 and then Is_Entity_Name
(Name
(Last_Stm
))
6615 -- Check call to Raise_Exception procedure which is treated
6616 -- specially, as is a call to Reraise_Occurrence.
6618 -- We suppress the warning in these cases since it is likely that
6619 -- the programmer really does not expect to deal with the case
6620 -- of Null_Occurrence, and thus would find a warning about a
6621 -- missing return curious, and raising Program_Error does not
6622 -- seem such a bad behavior if this does occur.
6624 -- Note that in the Ada 2005 case for Raise_Exception, the actual
6625 -- behavior will be to raise Constraint_Error (see AI-329).
6627 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
6629 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
6631 Raise_Exception_Call
:= True;
6633 -- For Raise_Exception call, test first argument, if it is
6634 -- an attribute reference for a 'Identity call, then we know
6635 -- that the call cannot possibly return.
6638 Arg
: constant Node_Id
:=
6639 Original_Node
(First_Actual
(Last_Stm
));
6641 if Nkind
(Arg
) = N_Attribute_Reference
6642 and then Attribute_Name
(Arg
) = Name_Identity
6649 -- If statement, need to look inside if there is an else and check
6650 -- each constituent statement sequence for proper termination.
6652 elsif Kind
= N_If_Statement
6653 and then Present
(Else_Statements
(Last_Stm
))
6655 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
6656 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6658 if Present
(Elsif_Parts
(Last_Stm
)) then
6660 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
6663 while Present
(Elsif_Part
) loop
6664 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
6672 -- Case statement, check each case for proper termination
6674 elsif Kind
= N_Case_Statement
then
6678 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
6679 while Present
(Case_Alt
) loop
6680 Check_Statement_Sequence
(Statements
(Case_Alt
));
6681 Next_Non_Pragma
(Case_Alt
);
6687 -- Block statement, check its handled sequence of statements
6689 elsif Kind
= N_Block_Statement
then
6695 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
6704 -- Loop statement. If there is an iteration scheme, we can definitely
6705 -- fall out of the loop. Similarly if there is an exit statement, we
6706 -- can fall out. In either case we need a following return.
6708 elsif Kind
= N_Loop_Statement
then
6709 if Present
(Iteration_Scheme
(Last_Stm
))
6710 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
6714 -- A loop with no exit statement or iteration scheme is either
6715 -- an infinite loop, or it has some other exit (raise/return).
6716 -- In either case, no warning is required.
6722 -- Timed entry call, check entry call and delay alternatives
6724 -- Note: in expanded code, the timed entry call has been converted
6725 -- to a set of expanded statements on which the check will work
6726 -- correctly in any case.
6728 elsif Kind
= N_Timed_Entry_Call
then
6730 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6731 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
6734 -- If statement sequence of entry call alternative is missing,
6735 -- then we can definitely fall through, and we post the error
6736 -- message on the entry call alternative itself.
6738 if No
(Statements
(ECA
)) then
6741 -- If statement sequence of delay alternative is missing, then
6742 -- we can definitely fall through, and we post the error
6743 -- message on the delay alternative itself.
6745 -- Note: if both ECA and DCA are missing the return, then we
6746 -- post only one message, should be enough to fix the bugs.
6747 -- If not we will get a message next time on the DCA when the
6750 elsif No
(Statements
(DCA
)) then
6753 -- Else check both statement sequences
6756 Check_Statement_Sequence
(Statements
(ECA
));
6757 Check_Statement_Sequence
(Statements
(DCA
));
6762 -- Conditional entry call, check entry call and else part
6764 -- Note: in expanded code, the conditional entry call has been
6765 -- converted to a set of expanded statements on which the check
6766 -- will work correctly in any case.
6768 elsif Kind
= N_Conditional_Entry_Call
then
6770 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
6773 -- If statement sequence of entry call alternative is missing,
6774 -- then we can definitely fall through, and we post the error
6775 -- message on the entry call alternative itself.
6777 if No
(Statements
(ECA
)) then
6780 -- Else check statement sequence and else part
6783 Check_Statement_Sequence
(Statements
(ECA
));
6784 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
6790 -- If we fall through, issue appropriate message
6794 -- Kill warning if last statement is a raise exception call,
6795 -- or a pragma Assert (False). Note that with assertions enabled,
6796 -- such a pragma has been converted into a raise exception call
6797 -- already, so the Assert_False is for the assertions off case.
6799 if not Raise_Exception_Call
and then not Assert_False
then
6801 -- In GNATprove mode, it is an error to have a missing return
6803 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6805 -- Issue error message or warning
6808 ("RETURN statement missing following this statement<<!",
6811 ("\Program_Error ]<<!", Last_Stm
);
6814 -- Note: we set Err even though we have not issued a warning
6815 -- because we still have a case of a missing return. This is
6816 -- an extremely marginal case, probably will never be noticed
6817 -- but we might as well get it right.
6821 -- Otherwise we have the case of a procedure marked No_Return
6824 if not Raise_Exception_Call
then
6825 if GNATprove_Mode
then
6827 ("implied return after this statement would have raised "
6828 & "Program_Error", Last_Stm
);
6830 -- In normal compilation mode, do not warn on a generated call
6831 -- (e.g. in the body of a renaming as completion).
6833 elsif Comes_From_Source
(Last_Stm
) then
6835 ("implied return after this statement will raise "
6836 & "Program_Error??", Last_Stm
);
6839 Error_Msg_Warn
:= SPARK_Mode
/= On
;
6841 ("\procedure & is marked as No_Return<<!", Last_Stm
, Proc
);
6845 RE
: constant Node_Id
:=
6846 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
6847 Reason
=> PE_Implicit_Return
);
6849 Insert_After
(Last_Stm
, RE
);
6853 end Check_Statement_Sequence
;
6855 -- Start of processing for Check_Returns
6859 Check_Statement_Sequence
(Statements
(HSS
));
6861 if Present
(Exception_Handlers
(HSS
)) then
6862 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
6863 while Present
(Handler
) loop
6864 Check_Statement_Sequence
(Statements
(Handler
));
6865 Next_Non_Pragma
(Handler
);
6870 ----------------------------
6871 -- Check_Subprogram_Order --
6872 ----------------------------
6874 procedure Check_Subprogram_Order
(N
: Node_Id
) is
6876 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
6877 -- This is used to check if S1 > S2 in the sense required by this test,
6878 -- for example nameab < namec, but name2 < name10.
6880 -----------------------------
6881 -- Subprogram_Name_Greater --
6882 -----------------------------
6884 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
6889 -- Deal with special case where names are identical except for a
6890 -- numerical suffix. These are handled specially, taking the numeric
6891 -- ordering from the suffix into account.
6894 while S1
(L1
) in '0' .. '9' loop
6899 while S2
(L2
) in '0' .. '9' loop
6903 -- If non-numeric parts non-equal, do straight compare
6905 if S1
(S1
'First .. L1
) /= S2
(S2
'First .. L2
) then
6908 -- If non-numeric parts equal, compare suffixed numeric parts. Note
6909 -- that a missing suffix is treated as numeric zero in this test.
6913 while L1
< S1
'Last loop
6915 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
6919 while L2
< S2
'Last loop
6921 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
6926 end Subprogram_Name_Greater
;
6928 -- Start of processing for Check_Subprogram_Order
6931 -- Check body in alpha order if this is option
6934 and then Style_Check_Order_Subprograms
6935 and then Nkind
(N
) = N_Subprogram_Body
6936 and then Comes_From_Source
(N
)
6937 and then In_Extended_Main_Source_Unit
(N
)
6941 renames Scope_Stack
.Table
6942 (Scope_Stack
.Last
).Last_Subprogram_Name
;
6944 Body_Id
: constant Entity_Id
:=
6945 Defining_Entity
(Specification
(N
));
6948 Get_Decoded_Name_String
(Chars
(Body_Id
));
6951 if Subprogram_Name_Greater
6952 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
6954 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
6960 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
6963 end Check_Subprogram_Order;
6965 ------------------------------
6966 -- Check_Subtype_Conformant --
6967 ------------------------------
6969 procedure Check_Subtype_Conformant
6970 (New_Id : Entity_Id;
6972 Err_Loc : Node_Id := Empty;
6973 Skip_Controlling_Formals : Boolean := False;
6974 Get_Inst : Boolean := False)
6977 pragma Warnings (Off, Result);
6980 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
6981 Skip_Controlling_Formals => Skip_Controlling_Formals,
6982 Get_Inst => Get_Inst);
6983 end Check_Subtype_Conformant;
6985 -----------------------------------
6986 -- Check_Synchronized_Overriding --
6987 -----------------------------------
6989 procedure Check_Synchronized_Overriding
6990 (Def_Id : Entity_Id;
6991 Overridden_Subp : out Entity_Id)
6993 Ifaces_List : Elist_Id;
6997 function Matches_Prefixed_View_Profile
6998 (Prim_Params : List_Id;
6999 Iface_Params : List_Id) return Boolean;
7000 -- Determine whether a subprogram's parameter profile Prim_Params
7001 -- matches that of a potentially overridden interface subprogram
7002 -- Iface_Params. Also determine if the type of first parameter of
7003 -- Iface_Params is an implemented interface.
7005 -----------------------------------
7006 -- Matches_Prefixed_View_Profile --
7007 -----------------------------------
7009 function Matches_Prefixed_View_Profile
7010 (Prim_Params : List_Id;
7011 Iface_Params : List_Id) return Boolean
7013 function Is_Implemented
7014 (Ifaces_List : Elist_Id;
7015 Iface : Entity_Id) return Boolean;
7016 -- Determine if Iface is implemented by the current task or
7019 --------------------
7020 -- Is_Implemented --
7021 --------------------
7023 function Is_Implemented
7024 (Ifaces_List : Elist_Id;
7025 Iface : Entity_Id) return Boolean
7027 Iface_Elmt : Elmt_Id;
7030 Iface_Elmt := First_Elmt (Ifaces_List);
7031 while Present (Iface_Elmt) loop
7032 if Node (Iface_Elmt) = Iface then
7036 Next_Elmt (Iface_Elmt);
7044 Iface_Id : Entity_Id;
7045 Iface_Param : Node_Id;
7046 Iface_Typ : Entity_Id;
7047 Prim_Id : Entity_Id;
7048 Prim_Param : Node_Id;
7049 Prim_Typ : Entity_Id;
7051 -- Start of processing for Matches_Prefixed_View_Profile
7054 Iface_Param := First (Iface_Params);
7055 Iface_Typ := Etype (Defining_Identifier (Iface_Param));
7057 if Is_Access_Type (Iface_Typ) then
7058 Iface_Typ := Designated_Type (Iface_Typ);
7061 Prim_Param := First (Prim_Params);
7063 -- The first parameter of the potentially overridden subprogram must
7064 -- be an interface implemented by Prim.
7066 if not Is_Interface (Iface_Typ)
7067 or else not Is_Implemented (Ifaces_List, Iface_Typ)
7072 -- The checks on the object parameters are done, so move on to the
7073 -- rest of the parameters.
7075 if not In_Scope then
7076 Prim_Param := Next (Prim_Param);
7079 Iface_Param := Next (Iface_Param);
7080 while Present (Iface_Param) and then Present (Prim_Param) loop
7081 Iface_Id := Defining_Identifier (Iface_Param);
7082 Iface_Typ := Find_Parameter_Type (Iface_Param);
7084 Prim_Id := Defining_Identifier (Prim_Param);
7085 Prim_Typ := Find_Parameter_Type (Prim_Param);
7087 if Ekind (Iface_Typ) = E_Anonymous_Access_Type
7088 and then Ekind (Prim_Typ) = E_Anonymous_Access_Type
7089 and then Is_Concurrent_Type (Designated_Type (Prim_Typ))
7091 Iface_Typ := Designated_Type (Iface_Typ);
7092 Prim_Typ := Designated_Type (Prim_Typ);
7095 -- Case of multiple interface types inside a parameter profile
7097 -- (Obj_Param : in out Iface; ...; Param : Iface)
7099 -- If the interface type is implemented, then the matching type in
7100 -- the primitive should be the implementing record type.
7102 if Ekind (Iface_Typ) = E_Record_Type
7103 and then Is_Interface (Iface_Typ)
7104 and then Is_Implemented (Ifaces_List, Iface_Typ)
7106 if Prim_Typ /= Typ then
7110 -- The two parameters must be both mode and subtype conformant
7112 elsif Ekind (Iface_Id) /= Ekind (Prim_Id)
7114 Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant)
7123 -- One of the two lists contains more parameters than the other
7125 if Present (Iface_Param) or else Present (Prim_Param) then
7130 end Matches_Prefixed_View_Profile;
7132 -- Start of processing for Check_Synchronized_Overriding
7135 Overridden_Subp := Empty;
7137 -- Def_Id must be an entry or a subprogram. We should skip predefined
7138 -- primitives internally generated by the front end; however at this
7139 -- stage predefined primitives are still not fully decorated. As a
7140 -- minor optimization we skip here internally generated subprograms.
7142 if (Ekind (Def_Id) /= E_Entry
7143 and then Ekind (Def_Id) /= E_Function
7144 and then Ekind (Def_Id) /= E_Procedure)
7145 or else not Comes_From_Source (Def_Id)
7150 -- Search for the concurrent declaration since it contains the list of
7151 -- all implemented interfaces. In this case, the subprogram is declared
7152 -- within the scope of a protected or a task type.
7154 if Present (Scope (Def_Id))
7155 and then Is_Concurrent_Type (Scope (Def_Id))
7156 and then not Is_Generic_Actual_Type (Scope (Def_Id))
7158 Typ := Scope (Def_Id);
7161 -- The enclosing scope is not a synchronized type and the subprogram
7164 elsif No (First_Formal (Def_Id)) then
7167 -- The subprogram has formals and hence it may be a primitive of a
7171 Typ := Etype (First_Formal (Def_Id));
7173 if Is_Access_Type (Typ) then
7174 Typ := Directly_Designated_Type (Typ);
7177 if Is_Concurrent_Type (Typ)
7178 and then not Is_Generic_Actual_Type (Typ)
7182 -- This case occurs when the concurrent type is declared within a
7183 -- generic unit. As a result the corresponding record has been built
7184 -- and used as the type of the first formal, we just have to retrieve
7185 -- the corresponding concurrent type.
7187 elsif Is_Concurrent_Record_Type (Typ)
7188 and then not Is_Class_Wide_Type (Typ)
7189 and then Present (Corresponding_Concurrent_Type (Typ))
7191 Typ := Corresponding_Concurrent_Type (Typ);
7199 -- There is no overriding to check if this is an inherited operation in
7200 -- a type derivation for a generic actual.
7202 Collect_Interfaces (Typ, Ifaces_List);
7204 if Is_Empty_Elmt_List (Ifaces_List) then
7208 -- Determine whether entry or subprogram Def_Id overrides a primitive
7209 -- operation that belongs to one of the interfaces in Ifaces_List.
7212 Candidate : Entity_Id := Empty;
7213 Hom : Entity_Id := Empty;
7214 Subp : Entity_Id := Empty;
7217 -- Traverse the homonym chain, looking for a potentially overridden
7218 -- subprogram that belongs to an implemented interface.
7220 Hom := Current_Entity_In_Scope (Def_Id);
7221 while Present (Hom) loop
7225 or else not Is_Overloadable (Subp)
7226 or else not Is_Primitive (Subp)
7227 or else not Is_Dispatching_Operation (Subp)
7228 or else not Present (Find_Dispatching_Type (Subp))
7229 or else not Is_Interface (Find_Dispatching_Type (Subp))
7233 -- Entries and procedures can override abstract or null interface
7236 elsif Ekind_In (Def_Id, E_Entry, E_Procedure)
7237 and then Ekind (Subp) = E_Procedure
7238 and then Matches_Prefixed_View_Profile
7239 (Parameter_Specifications (Parent (Def_Id)),
7240 Parameter_Specifications (Parent (Subp)))
7244 -- For an overridden subprogram Subp, check whether the mode
7245 -- of its first parameter is correct depending on the kind of
7246 -- synchronized type.
7249 Formal : constant Node_Id := First_Formal (Candidate);
7252 -- In order for an entry or a protected procedure to
7253 -- override, the first parameter of the overridden routine
7254 -- must be of mode "out", "in out", or access-to-variable.
7256 if Ekind_In (Candidate, E_Entry, E_Procedure)
7257 and then Is_Protected_Type (Typ)
7258 and then Ekind (Formal) /= E_In_Out_Parameter
7259 and then Ekind (Formal) /= E_Out_Parameter
7260 and then Nkind (Parameter_Type (Parent (Formal))) /=
7265 -- All other cases are OK since a task entry or routine does
7266 -- not have a restriction on the mode of the first parameter
7267 -- of the overridden interface routine.
7270 Overridden_Subp := Candidate;
7275 -- Functions can override abstract interface functions
7277 elsif Ekind (Def_Id) = E_Function
7278 and then Ekind (Subp) = E_Function
7279 and then Matches_Prefixed_View_Profile
7280 (Parameter_Specifications (Parent (Def_Id)),
7281 Parameter_Specifications (Parent (Subp)))
7282 and then Etype (Def_Id) = Etype (Subp)
7286 -- If an inherited subprogram is implemented by a protected
7287 -- function, then the first parameter of the inherited
7288 -- subprogram shall be of mode in, but not an access-to-
7289 -- variable parameter (RM 9.4(11/9)).
7291 if Present (First_Formal (Subp))
7292 and then Ekind (First_Formal (Subp)) = E_In_Parameter
7294 (not Is_Access_Type (Etype (First_Formal (Subp)))
7296 Is_Access_Constant (Etype (First_Formal (Subp))))
7298 Overridden_Subp := Subp;
7303 Hom := Homonym (Hom);
7306 -- After examining all candidates for overriding, we are left with
7307 -- the best match, which is a mode-incompatible interface routine.
7309 if In_Scope and then Present (Candidate) then
7310 Error_Msg_PT (Def_Id, Candidate);
7313 Overridden_Subp := Candidate;
7316 end Check_Synchronized_Overriding;
7318 ---------------------------
7319 -- Check_Type_Conformant --
7320 ---------------------------
7322 procedure Check_Type_Conformant
7323 (New_Id : Entity_Id;
7325 Err_Loc : Node_Id := Empty)
7328 pragma Warnings (Off, Result);
7331 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
7332 end Check_Type_Conformant;
7334 ---------------------------
7335 -- Can_Override_Operator --
7336 ---------------------------
7338 function Can_Override_Operator (Subp : Entity_Id) return Boolean is
7342 if Nkind (Subp) /= N_Defining_Operator_Symbol then
7346 Typ := Base_Type (Etype (First_Formal (Subp)));
7348 -- Check explicitly that the operation is a primitive of the type
7350 return Operator_Matches_Spec (Subp, Subp)
7351 and then not Is_Generic_Type (Typ)
7352 and then Scope (Subp) = Scope (Typ)
7353 and then not Is_Class_Wide_Type (Typ);
7355 end Can_Override_Operator;
7357 ----------------------
7358 -- Conforming_Types --
7359 ----------------------
7361 function Conforming_Types
7364 Ctype : Conformance_Type;
7365 Get_Inst : Boolean := False) return Boolean
7367 function Base_Types_Match
7369 Typ_2 : Entity_Id) return Boolean;
7370 -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are
7371 -- in different scopes (e.g. parent and child instances), then verify
7372 -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on
7373 -- the same subtype chain. The whole purpose of this procedure is to
7374 -- prevent spurious ambiguities in an instantiation that may arise if
7375 -- two distinct generic types are instantiated with the same actual.
7377 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id;
7378 -- An access parameter can designate an incomplete type. If the
7379 -- incomplete type is the limited view of a type from a limited_
7380 -- with_clause, check whether the non-limited view is available.
7381 -- If it is a (non-limited) incomplete type, get the full view.
7383 function Matches_Limited_With_View
7385 Typ_2 : Entity_Id) return Boolean;
7386 -- Returns True if and only if either Typ_1 denotes a limited view of
7387 -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when
7388 -- the limited with view of a type is used in a subprogram declaration
7389 -- and the subprogram body is in the scope of a regular with clause for
7390 -- the same unit. In such a case, the two type entities are considered
7391 -- identical for purposes of conformance checking.
7393 ----------------------
7394 -- Base_Types_Match --
7395 ----------------------
7397 function Base_Types_Match
7399 Typ_2 : Entity_Id) return Boolean
7401 Base_1 : constant Entity_Id := Base_Type (Typ_1);
7402 Base_2 : constant Entity_Id := Base_Type (Typ_2);
7405 if Typ_1 = Typ_2 then
7408 elsif Base_1 = Base_2 then
7410 -- The following is too permissive. A more precise test should
7411 -- check that the generic actual is an ancestor subtype of the
7414 -- See code in Find_Corresponding_Spec that applies an additional
7415 -- filter to handle accidental amiguities in instances.
7418 not Is_Generic_Actual_Type (Typ_1)
7419 or else not Is_Generic_Actual_Type (Typ_2)
7420 or else Scope (Typ_1) /= Scope (Typ_2);
7422 -- If Typ_2 is a generic actual type it is declared as the subtype of
7423 -- the actual. If that actual is itself a subtype we need to use its
7424 -- own base type to check for compatibility.
7426 elsif Ekind (Base_2) = Ekind (Typ_2)
7427 and then Base_1 = Base_Type (Base_2)
7431 elsif Ekind (Base_1) = Ekind (Typ_1)
7432 and then Base_2 = Base_Type (Base_1)
7439 end Base_Types_Match;
7441 --------------------------
7442 -- Find_Designated_Type --
7443 --------------------------
7445 function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is
7449 Desig := Directly_Designated_Type (Typ);
7451 if Ekind (Desig) = E_Incomplete_Type then
7453 -- If regular incomplete type, get full view if available
7455 if Present (Full_View (Desig)) then
7456 Desig := Full_View (Desig);
7458 -- If limited view of a type, get non-limited view if available,
7459 -- and check again for a regular incomplete type.
7461 elsif Present (Non_Limited_View (Desig)) then
7462 Desig := Get_Full_View (Non_Limited_View (Desig));
7467 end Find_Designated_Type;
7469 -------------------------------
7470 -- Matches_Limited_With_View --
7471 -------------------------------
7473 function Matches_Limited_With_View
7475 Typ_2 : Entity_Id) return Boolean
7477 function Is_Matching_Limited_View
7479 View : Entity_Id) return Boolean;
7480 -- Determine whether non-limited view View denotes type Typ in some
7481 -- conformant fashion.
7483 ------------------------------
7484 -- Is_Matching_Limited_View --
7485 ------------------------------
7487 function Is_Matching_Limited_View
7489 View : Entity_Id) return Boolean
7491 Root_Typ : Entity_Id;
7492 Root_View : Entity_Id;
7495 -- The non-limited view directly denotes the type
7500 -- The type is a subtype of the non-limited view
7502 elsif Is_Subtype_Of (Typ, View) then
7505 -- Both the non-limited view and the type denote class-wide types
7507 elsif Is_Class_Wide_Type (Typ)
7508 and then Is_Class_Wide_Type (View)
7510 Root_Typ := Root_Type (Typ);
7511 Root_View := Root_Type (View);
7513 if Root_Typ = Root_View then
7516 -- An incomplete tagged type and its full view may receive two
7517 -- distinct class-wide types when the related package has not
7518 -- been analyzed yet.
7521 -- type T is tagged; -- CW_1
7522 -- type T is tagged null record; -- CW_2
7525 -- This is because the package lacks any semantic information
7526 -- that may eventually link both views of T. As a consequence,
7527 -- a client of the limited view of Pack will see CW_2 while a
7528 -- client of the non-limited view of Pack will see CW_1.
7530 elsif Is_Incomplete_Type (Root_Typ)
7531 and then Present (Full_View (Root_Typ))
7532 and then Full_View (Root_Typ) = Root_View
7536 elsif Is_Incomplete_Type (Root_View)
7537 and then Present (Full_View (Root_View))
7538 and then Full_View (Root_View) = Root_Typ
7545 end Is_Matching_Limited_View;
7547 -- Start of processing for Matches_Limited_With_View
7550 -- In some cases a type imported through a limited_with clause, and
7551 -- its non-limited view are both visible, for example in an anonymous
7552 -- access-to-class-wide type in a formal, or when building the body
7553 -- for a subprogram renaming after the subprogram has been frozen.
7554 -- In these cases both entities designate the same type. In addition,
7555 -- if one of them is an actual in an instance, it may be a subtype of
7556 -- the non-limited view of the other.
7558 if From_Limited_With (Typ_1)
7559 and then From_Limited_With (Typ_2)
7560 and then Available_View (Typ_1) = Available_View (Typ_2)
7564 elsif From_Limited_With (Typ_1) then
7565 return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1));
7567 elsif From_Limited_With (Typ_2) then
7568 return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2));
7573 end Matches_Limited_With_View;
7577 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
7579 Type_1 : Entity_Id := T1;
7580 Type_2 : Entity_Id := T2;
7582 -- Start of processing for Conforming_Types
7585 -- The context is an instance association for a formal access-to-
7586 -- subprogram type; the formal parameter types require mapping because
7587 -- they may denote other formal parameters of the generic unit.
7590 Type_1 := Get_Instance_Of (T1);
7591 Type_2 := Get_Instance_Of (T2);
7594 -- If one of the types is a view of the other introduced by a limited
7595 -- with clause, treat these as conforming for all purposes.
7597 if Matches_Limited_With_View (T1, T2) then
7600 elsif Base_Types_Match (Type_1, Type_2) then
7601 if Ctype <= Mode_Conformant then
7606 Subtypes_Statically_Match (Type_1, Type_2)
7607 and then Dimensions_Match (Type_1, Type_2);
7610 elsif Is_Incomplete_Or_Private_Type (Type_1)
7611 and then Present (Full_View (Type_1))
7612 and then Base_Types_Match (Full_View (Type_1), Type_2)
7615 Ctype <= Mode_Conformant
7616 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
7618 elsif Ekind (Type_2) = E_Incomplete_Type
7619 and then Present (Full_View (Type_2))
7620 and then Base_Types_Match (Type_1, Full_View (Type_2))
7623 Ctype <= Mode_Conformant
7624 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7626 elsif Is_Private_Type (Type_2)
7627 and then In_Instance
7628 and then Present (Full_View (Type_2))
7629 and then Base_Types_Match (Type_1, Full_View (Type_2))
7632 Ctype <= Mode_Conformant
7633 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
7635 -- Another confusion between views in a nested instance with an
7636 -- actual private type whose full view is not in scope.
7638 elsif Ekind (Type_2) = E_Private_Subtype
7639 and then In_Instance
7640 and then Etype (Type_2) = Type_1
7644 -- In Ada 2012, incomplete types (including limited views) can appear
7645 -- as actuals in instantiations.
7647 elsif Is_Incomplete_Type (Type_1)
7648 and then Is_Incomplete_Type (Type_2)
7649 and then (Used_As_Generic_Actual (Type_1)
7650 or else Used_As_Generic_Actual (Type_2))
7655 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
7656 -- treated recursively because they carry a signature. As far as
7657 -- conformance is concerned, convention plays no role, and either
7658 -- or both could be access to protected subprograms.
7660 Are_Anonymous_Access_To_Subprogram_Types :=
7661 Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type,
7662 E_Anonymous_Access_Protected_Subprogram_Type)
7664 Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type,
7665 E_Anonymous_Access_Protected_Subprogram_Type);
7667 -- Test anonymous access type case. For this case, static subtype
7668 -- matching is required for mode conformance (RM 6.3.1(15)). We check
7669 -- the base types because we may have built internal subtype entities
7670 -- to handle null-excluding types (see Process_Formals).
7672 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
7674 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
7676 -- Ada 2005 (AI-254)
7678 or else Are_Anonymous_Access_To_Subprogram_Types
7681 Desig_1 : Entity_Id;
7682 Desig_2 : Entity_Id;
7685 -- In Ada 2005, access constant indicators must match for
7686 -- subtype conformance.
7688 if Ada_Version >= Ada_2005
7689 and then Ctype >= Subtype_Conformant
7691 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
7696 Desig_1 := Find_Designated_Type (Type_1);
7697 Desig_2 := Find_Designated_Type (Type_2);
7699 -- If the context is an instance association for a formal
7700 -- access-to-subprogram type; formal access parameter designated
7701 -- types require mapping because they may denote other formal
7702 -- parameters of the generic unit.
7705 Desig_1 := Get_Instance_Of (Desig_1);
7706 Desig_2 := Get_Instance_Of (Desig_2);
7709 -- It is possible for a Class_Wide_Type to be introduced for an
7710 -- incomplete type, in which case there is a separate class_ wide
7711 -- type for the full view. The types conform if their Etypes
7712 -- conform, i.e. one may be the full view of the other. This can
7713 -- only happen in the context of an access parameter, other uses
7714 -- of an incomplete Class_Wide_Type are illegal.
7716 if Is_Class_Wide_Type (Desig_1)
7718 Is_Class_Wide_Type (Desig_2)
7722 (Etype (Base_Type (Desig_1)),
7723 Etype (Base_Type (Desig_2)), Ctype);
7725 elsif Are_Anonymous_Access_To_Subprogram_Types then
7726 if Ada_Version < Ada_2005 then
7728 Ctype = Type_Conformant
7729 or else Subtypes_Statically_Match (Desig_1, Desig_2);
7731 -- We must check the conformance of the signatures themselves
7735 Conformant : Boolean;
7738 (Desig_1, Desig_2, Ctype, False, Conformant);
7743 -- A limited view of an actual matches the corresponding
7744 -- incomplete formal.
7746 elsif Ekind (Desig_2) = E_Incomplete_Subtype
7747 and then From_Limited_With (Desig_2)
7748 and then Used_As_Generic_Actual (Etype (Desig_2))
7753 return Base_Type (Desig_1) = Base_Type (Desig_2)
7754 and then (Ctype = Type_Conformant
7756 Subtypes_Statically_Match (Desig_1, Desig_2));
7760 -- Otherwise definitely no match
7763 if ((Ekind (Type_1) = E_Anonymous_Access_Type
7764 and then Is_Access_Type (Type_2))
7765 or else (Ekind (Type_2) = E_Anonymous_Access_Type
7766 and then Is_Access_Type (Type_1)))
7769 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
7771 May_Hide_Profile := True;
7776 end Conforming_Types;
7778 --------------------------
7779 -- Create_Extra_Formals --
7780 --------------------------
7782 procedure Create_Extra_Formals (E : Entity_Id) is
7783 First_Extra : Entity_Id := Empty;
7785 Last_Extra : Entity_Id := Empty;
7787 function Add_Extra_Formal
7788 (Assoc_Entity : Entity_Id;
7791 Suffix : String) return Entity_Id;
7792 -- Add an extra formal to the current list of formals and extra formals.
7793 -- The extra formal is added to the end of the list of extra formals,
7794 -- and also returned as the result. These formals are always of mode IN.
7795 -- The new formal has the type Typ, is declared in Scope, and its name
7796 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
7797 -- The following suffixes are currently used. They should not be changed
7798 -- without coordinating with CodePeer, which makes use of these to
7799 -- provide better messages.
7801 -- O denotes the Constrained bit.
7802 -- L denotes the accessibility level.
7803 -- BIP_xxx denotes an extra formal for a build-in-place function. See
7804 -- the full list in exp_ch6.BIP_Formal_Kind.
7806 ----------------------
7807 -- Add_Extra_Formal --
7808 ----------------------
7810 function Add_Extra_Formal
7811 (Assoc_Entity : Entity_Id;
7814 Suffix : String) return Entity_Id
7816 EF : constant Entity_Id :=
7817 Make_Defining_Identifier (Sloc (Assoc_Entity),
7818 Chars => New_External_Name (Chars (Assoc_Entity),
7822 -- A little optimization. Never generate an extra formal for the
7823 -- _init operand of an initialization procedure, since it could
7826 if Chars (Formal) = Name_uInit then
7830 Set_Ekind (EF, E_In_Parameter);
7831 Set_Actual_Subtype (EF, Typ);
7832 Set_Etype (EF, Typ);
7833 Set_Scope (EF, Scope);
7834 Set_Mechanism (EF, Default_Mechanism);
7835 Set_Formal_Validity (EF);
7837 if No (First_Extra) then
7839 Set_Extra_Formals (Scope, First_Extra);
7842 if Present (Last_Extra) then
7843 Set_Extra_Formal (Last_Extra, EF);
7849 end Add_Extra_Formal;
7853 Formal_Type : Entity_Id;
7854 P_Formal : Entity_Id := Empty;
7856 -- Start of processing for Create_Extra_Formals
7859 -- We never generate extra formals if expansion is not active because we
7860 -- don't need them unless we are generating code.
7862 if not Expander_Active then
7866 -- No need to generate extra formals in interface thunks whose target
7867 -- primitive has no extra formals.
7869 if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then
7873 -- If this is a derived subprogram then the subtypes of the parent
7874 -- subprogram's formal parameters will be used to determine the need
7875 -- for extra formals.
7877 if Is_Overloadable (E) and then Present (Alias (E)) then
7878 P_Formal := First_Formal (Alias (E));
7881 Formal := First_Formal (E);
7882 while Present (Formal) loop
7883 Last_Extra := Formal;
7884 Next_Formal (Formal);
7887 -- If Extra_Formals were already created, don't do it again. This
7888 -- situation may arise for subprogram types created as part of
7889 -- dispatching calls (see Expand_Dispatching_Call)
7891 if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then
7895 -- If the subprogram is a predefined dispatching subprogram then don't
7896 -- generate any extra constrained or accessibility level formals. In
7897 -- general we suppress these for internal subprograms (by not calling
7898 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
7899 -- generated stream attributes do get passed through because extra
7900 -- build-in-place formals are needed in some cases (limited 'Input
).
7902 if Is_Predefined_Internal_Operation
(E
) then
7903 goto Test_For_Func_Result_Extras
;
7906 Formal
:= First_Formal
(E
);
7907 while Present
(Formal
) loop
7909 -- Create extra formal for supporting the attribute 'Constrained.
7910 -- The case of a private type view without discriminants also
7911 -- requires the extra formal if the underlying type has defaulted
7914 if Ekind
(Formal
) /= E_In_Parameter
then
7915 if Present
(P_Formal
) then
7916 Formal_Type
:= Etype
(P_Formal
);
7918 Formal_Type
:= Etype
(Formal
);
7921 -- Do not produce extra formals for Unchecked_Union parameters.
7922 -- Jump directly to the end of the loop.
7924 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
7925 goto Skip_Extra_Formal_Generation
;
7928 if not Has_Discriminants
(Formal_Type
)
7929 and then Ekind
(Formal_Type
) in Private_Kind
7930 and then Present
(Underlying_Type
(Formal_Type
))
7932 Formal_Type
:= Underlying_Type
(Formal_Type
);
7935 -- Suppress the extra formal if formal's subtype is constrained or
7936 -- indefinite, or we're compiling for Ada 2012 and the underlying
7937 -- type is tagged and limited. In Ada 2012, a limited tagged type
7938 -- can have defaulted discriminants, but 'Constrained is required
7939 -- to return True, so the formal is never needed (see AI05-0214).
7940 -- Note that this ensures consistency of calling sequences for
7941 -- dispatching operations when some types in a class have defaults
7942 -- on discriminants and others do not (and requiring the extra
7943 -- formal would introduce distributed overhead).
7945 -- If the type does not have a completion yet, treat as prior to
7946 -- Ada 2012 for consistency.
7948 if Has_Discriminants
(Formal_Type
)
7949 and then not Is_Constrained
(Formal_Type
)
7950 and then Is_Definite_Subtype
(Formal_Type
)
7951 and then (Ada_Version
< Ada_2012
7952 or else No
(Underlying_Type
(Formal_Type
))
7954 (Is_Limited_Type
(Formal_Type
)
7957 (Underlying_Type
(Formal_Type
)))))
7959 Set_Extra_Constrained
7960 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
7964 -- Create extra formal for supporting accessibility checking. This
7965 -- is done for both anonymous access formals and formals of named
7966 -- access types that are marked as controlling formals. The latter
7967 -- case can occur when Expand_Dispatching_Call creates a subprogram
7968 -- type and substitutes the types of access-to-class-wide actuals
7969 -- for the anonymous access-to-specific-type of controlling formals.
7970 -- Base_Type is applied because in cases where there is a null
7971 -- exclusion the formal may have an access subtype.
7973 -- This is suppressed if we specifically suppress accessibility
7974 -- checks at the package level for either the subprogram, or the
7975 -- package in which it resides. However, we do not suppress it
7976 -- simply if the scope has accessibility checks suppressed, since
7977 -- this could cause trouble when clients are compiled with a
7978 -- different suppression setting. The explicit checks at the
7979 -- package level are safe from this point of view.
7981 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
7982 or else (Is_Controlling_Formal
(Formal
)
7983 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
7985 (Explicit_Suppress
(E
, Accessibility_Check
)
7987 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
7990 or else Present
(Extra_Accessibility
(P_Formal
)))
7992 Set_Extra_Accessibility
7993 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
7996 -- This label is required when skipping extra formal generation for
7997 -- Unchecked_Union parameters.
7999 <<Skip_Extra_Formal_Generation
>>
8001 if Present
(P_Formal
) then
8002 Next_Formal
(P_Formal
);
8005 Next_Formal
(Formal
);
8008 <<Test_For_Func_Result_Extras
>>
8010 -- Ada 2012 (AI05-234): "the accessibility level of the result of a
8011 -- function call is ... determined by the point of call ...".
8013 if Needs_Result_Accessibility_Level
(E
) then
8014 Set_Extra_Accessibility_Of_Result
8015 (E
, Add_Extra_Formal
(E
, Standard_Natural
, E
, "L"));
8018 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
8019 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
8021 if Is_Build_In_Place_Function
(E
) then
8023 Result_Subt
: constant Entity_Id
:= Etype
(E
);
8024 Full_Subt
: constant Entity_Id
:= Available_View
(Result_Subt
);
8025 Formal_Typ
: Entity_Id
;
8026 Subp_Decl
: Node_Id
;
8028 Discard
: Entity_Id
;
8029 pragma Warnings
(Off
, Discard
);
8032 -- In the case of functions with unconstrained result subtypes,
8033 -- add a 4-state formal indicating whether the return object is
8034 -- allocated by the caller (1), or should be allocated by the
8035 -- callee on the secondary stack (2), in the global heap (3), or
8036 -- in a user-defined storage pool (4). For the moment we just use
8037 -- Natural for the type of this formal. Note that this formal
8038 -- isn't usually needed in the case where the result subtype is
8039 -- constrained, but it is needed when the function has a tagged
8040 -- result, because generally such functions can be called in a
8041 -- dispatching context and such calls must be handled like calls
8042 -- to a class-wide function.
8044 if Needs_BIP_Alloc_Form
(E
) then
8047 (E
, Standard_Natural
,
8048 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
8050 -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to
8051 -- use a user-defined pool. This formal is not added on
8052 -- ZFP as those targets do not support pools.
8054 if RTE_Available
(RE_Root_Storage_Pool_Ptr
) then
8057 (E
, RTE
(RE_Root_Storage_Pool_Ptr
),
8058 E
, BIP_Formal_Suffix
(BIP_Storage_Pool
));
8062 -- In the case of functions whose result type needs finalization,
8063 -- add an extra formal which represents the finalization master.
8065 if Needs_BIP_Finalization_Master
(E
) then
8068 (E
, RTE
(RE_Finalization_Master_Ptr
),
8069 E
, BIP_Formal_Suffix
(BIP_Finalization_Master
));
8072 -- When the result type contains tasks, add two extra formals: the
8073 -- master of the tasks to be created, and the caller's activation
8076 if Has_Task
(Full_Subt
) then
8079 (E
, RTE
(RE_Master_Id
),
8080 E
, BIP_Formal_Suffix
(BIP_Task_Master
));
8083 (E
, RTE
(RE_Activation_Chain_Access
),
8084 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
8087 -- All build-in-place functions get an extra formal that will be
8088 -- passed the address of the return object within the caller.
8091 Create_Itype
(E_Anonymous_Access_Type
, E
, Scope_Id
=> Scope
(E
));
8093 Set_Directly_Designated_Type
(Formal_Typ
, Result_Subt
);
8094 Set_Etype
(Formal_Typ
, Formal_Typ
);
8095 Set_Depends_On_Private
8096 (Formal_Typ
, Has_Private_Component
(Formal_Typ
));
8097 Set_Is_Public
(Formal_Typ
, Is_Public
(Scope
(Formal_Typ
)));
8098 Set_Is_Access_Constant
(Formal_Typ
, False);
8100 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
8101 -- the designated type comes from the limited view (for back-end
8104 Set_From_Limited_With
8105 (Formal_Typ
, From_Limited_With
(Result_Subt
));
8107 Layout_Type
(Formal_Typ
);
8109 -- Force the definition of the Itype in case of internal function
8110 -- calls within the same or nested scope.
8112 if Is_Subprogram_Or_Generic_Subprogram
(E
) then
8113 Subp_Decl
:= Parent
(E
);
8115 -- The insertion point for an Itype reference should be after
8116 -- the unit declaration node of the subprogram. An exception
8117 -- to this are inherited operations from a parent type in which
8118 -- case the derived type acts as their parent.
8120 if Nkind_In
(Subp_Decl
, N_Function_Specification
,
8121 N_Procedure_Specification
)
8123 Subp_Decl
:= Parent
(Subp_Decl
);
8126 Build_Itype_Reference
(Formal_Typ
, Subp_Decl
);
8131 (E
, Formal_Typ
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
8134 end Create_Extra_Formals
;
8136 -----------------------------
8137 -- Enter_Overloaded_Entity --
8138 -----------------------------
8140 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
8141 function Matches_Predefined_Op
return Boolean;
8142 -- This returns an approximation of whether S matches a predefined
8143 -- operator, based on the operator symbol, and the parameter and result
8144 -- types. The rules are scattered throughout chapter 4 of the Ada RM.
8146 ---------------------------
8147 -- Matches_Predefined_Op --
8148 ---------------------------
8150 function Matches_Predefined_Op
return Boolean is
8151 Formal_1
: constant Entity_Id
:= First_Formal
(S
);
8152 Formal_2
: constant Entity_Id
:= Next_Formal
(Formal_1
);
8153 Op
: constant Name_Id
:= Chars
(S
);
8154 Result_Type
: constant Entity_Id
:= Base_Type
(Etype
(S
));
8155 Type_1
: constant Entity_Id
:= Base_Type
(Etype
(Formal_1
));
8160 if Present
(Formal_2
) then
8162 Type_2
: constant Entity_Id
:= Base_Type
(Etype
(Formal_2
));
8165 -- All but "&" and "**" have same-types parameters
8174 if Type_1
/= Type_2
then
8179 -- Check parameter and result types
8187 Is_Boolean_Type
(Result_Type
)
8188 and then Result_Type
= Type_1
;
8194 Is_Integer_Type
(Result_Type
)
8195 and then Result_Type
= Type_1
;
8203 Is_Numeric_Type
(Result_Type
)
8204 and then Result_Type
= Type_1
;
8210 Is_Boolean_Type
(Result_Type
)
8211 and then not Is_Limited_Type
(Type_1
);
8219 Is_Boolean_Type
(Result_Type
)
8220 and then (Is_Array_Type
(Type_1
)
8221 or else Is_Scalar_Type
(Type_1
));
8223 when Name_Op_Concat
=>
8224 return Is_Array_Type
(Result_Type
);
8226 when Name_Op_Expon
=>
8228 (Is_Integer_Type
(Result_Type
)
8229 or else Is_Floating_Point_Type
(Result_Type
))
8230 and then Result_Type
= Type_1
8231 and then Type_2
= Standard_Integer
;
8234 raise Program_Error
;
8247 Is_Numeric_Type
(Result_Type
)
8248 and then Result_Type
= Type_1
;
8252 Is_Boolean_Type
(Result_Type
)
8253 and then Result_Type
= Type_1
;
8256 raise Program_Error
;
8259 end Matches_Predefined_Op
;
8263 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
8264 C_E
: Entity_Id
:= Current_Entity
(S
);
8266 -- Start of processing for Enter_Overloaded_Entity
8270 Set_Has_Homonym
(E
);
8271 Set_Has_Homonym
(S
);
8274 Set_Is_Immediately_Visible
(S
);
8275 Set_Scope
(S
, Current_Scope
);
8277 -- Chain new entity if front of homonym in current scope, so that
8278 -- homonyms are contiguous.
8280 if Present
(E
) and then E
/= C_E
then
8281 while Homonym
(C_E
) /= E
loop
8282 C_E
:= Homonym
(C_E
);
8285 Set_Homonym
(C_E
, S
);
8289 Set_Current_Entity
(S
);
8294 if Is_Inherited_Operation
(S
) then
8295 Append_Inherited_Subprogram
(S
);
8297 Append_Entity
(S
, Current_Scope
);
8300 Set_Public_Status
(S
);
8302 if Debug_Flag_E
then
8303 Write_Str
("New overloaded entity chain: ");
8304 Write_Name
(Chars
(S
));
8307 while Present
(E
) loop
8308 Write_Str
(" "); Write_Int
(Int
(E
));
8315 -- Generate warning for hiding
8318 and then Comes_From_Source
(S
)
8319 and then In_Extended_Main_Source_Unit
(S
)
8326 -- Warn unless genuine overloading. Do not emit warning on
8327 -- hiding predefined operators in Standard (these are either an
8328 -- (artifact of our implicit declarations, or simple noise) but
8329 -- keep warning on a operator defined on a local subtype, because
8330 -- of the real danger that different operators may be applied in
8331 -- various parts of the program.
8333 -- Note that if E and S have the same scope, there is never any
8334 -- hiding. Either the two conflict, and the program is illegal,
8335 -- or S is overriding an implicit inherited subprogram.
8337 if Scope
(E
) /= Scope
(S
)
8338 and then (not Is_Overloadable
(E
)
8339 or else Subtype_Conformant
(E
, S
))
8340 and then (Is_Immediately_Visible
(E
)
8341 or else Is_Potentially_Use_Visible
(S
))
8343 if Scope
(E
) = Standard_Standard
then
8344 if Nkind
(S
) = N_Defining_Operator_Symbol
8345 and then Scope
(Base_Type
(Etype
(First_Formal
(S
)))) /=
8347 and then Matches_Predefined_Op
8350 ("declaration of & hides predefined operator?h?", S
);
8353 -- E not immediately within Standard
8356 Error_Msg_Sloc
:= Sloc
(E
);
8357 Error_Msg_N
("declaration of & hides one #?h?", S
);
8362 end Enter_Overloaded_Entity
;
8364 -----------------------------
8365 -- Check_Untagged_Equality --
8366 -----------------------------
8368 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
8369 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
8370 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
8374 -- This check applies only if we have a subprogram declaration with an
8375 -- untagged record type.
8377 if Nkind
(Decl
) /= N_Subprogram_Declaration
8378 or else not Is_Record_Type
(Typ
)
8379 or else Is_Tagged_Type
(Typ
)
8384 -- In Ada 2012 case, we will output errors or warnings depending on
8385 -- the setting of debug flag -gnatd.E.
8387 if Ada_Version
>= Ada_2012
then
8388 Error_Msg_Warn
:= Debug_Flag_Dot_EE
;
8390 -- In earlier versions of Ada, nothing to do unless we are warning on
8391 -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set).
8394 if not Warn_On_Ada_2012_Compatibility
then
8399 -- Cases where the type has already been frozen
8401 if Is_Frozen
(Typ
) then
8403 -- If the type is not declared in a package, or if we are in the body
8404 -- of the package or in some other scope, the new operation is not
8405 -- primitive, and therefore legal, though suspicious. Should we
8406 -- generate a warning in this case ???
8408 if Ekind
(Scope
(Typ
)) /= E_Package
8409 or else Scope
(Typ
) /= Current_Scope
8413 -- If the type is a generic actual (sub)type, the operation is not
8414 -- primitive either because the base type is declared elsewhere.
8416 elsif Is_Generic_Actual_Type
(Typ
) then
8419 -- Here we have a definite error of declaration after freezing
8422 if Ada_Version
>= Ada_2012
then
8424 ("equality operator must be declared before type & is "
8425 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op
, Typ
);
8427 -- In Ada 2012 mode with error turned to warning, output one
8428 -- more warning to warn that the equality operation may not
8429 -- compose. This is the consequence of ignoring the error.
8431 if Error_Msg_Warn
then
8432 Error_Msg_N
("\equality operation may not compose??", Eq_Op
);
8437 ("equality operator must be declared before type& is "
8438 & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op
, Typ
);
8441 -- If we are in the package body, we could just move the
8442 -- declaration to the package spec, so add a message saying that.
8444 if In_Package_Body
(Scope
(Typ
)) then
8445 if Ada_Version
>= Ada_2012
then
8447 ("\move declaration to package spec<<", Eq_Op
);
8450 ("\move declaration to package spec (Ada 2012)?y?", Eq_Op
);
8453 -- Otherwise try to find the freezing point
8456 Obj_Decl
:= Next
(Parent
(Typ
));
8457 while Present
(Obj_Decl
) and then Obj_Decl
/= Decl
loop
8458 if Nkind
(Obj_Decl
) = N_Object_Declaration
8459 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
8461 -- Freezing point, output warnings
8463 if Ada_Version
>= Ada_2012
then
8465 ("type& is frozen by declaration??", Obj_Decl
, Typ
);
8467 ("\an equality operator cannot be declared after "
8472 ("type& is frozen by declaration (Ada 2012)?y?",
8475 ("\an equality operator cannot be declared after "
8476 & "this point (Ada 2012)?y?",
8488 -- Here if type is not frozen yet. It is illegal to have a primitive
8489 -- equality declared in the private part if the type is visible.
8491 elsif not In_Same_List
(Parent
(Typ
), Decl
)
8492 and then not Is_Limited_Type
(Typ
)
8494 -- Shouldn't we give an RM reference here???
8496 if Ada_Version
>= Ada_2012
then
8498 ("equality operator appears too late<<", Eq_Op
);
8501 ("equality operator appears too late (Ada 2012)?y?", Eq_Op
);
8504 -- No error detected
8509 end Check_Untagged_Equality
;
8511 -----------------------------
8512 -- Find_Corresponding_Spec --
8513 -----------------------------
8515 function Find_Corresponding_Spec
8517 Post_Error
: Boolean := True) return Entity_Id
8519 Spec
: constant Node_Id
:= Specification
(N
);
8520 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
8524 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean;
8525 -- Even if fully conformant, a body may depend on a generic actual when
8526 -- the spec does not, or vice versa, in which case they were distinct
8527 -- entities in the generic.
8529 -------------------------------
8530 -- Different_Generic_Profile --
8531 -------------------------------
8533 function Different_Generic_Profile
(E
: Entity_Id
) return Boolean is
8536 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean;
8537 -- Check that the types of corresponding formals have the same
8538 -- generic actual if any. We have to account for subtypes of a
8539 -- generic formal, declared between a spec and a body, which may
8540 -- appear distinct in an instance but matched in the generic, and
8541 -- the subtype may be used either in the spec or the body of the
8542 -- subprogram being checked.
8544 -------------------------
8545 -- Same_Generic_Actual --
8546 -------------------------
8548 function Same_Generic_Actual
(T1
, T2
: Entity_Id
) return Boolean is
8550 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean;
8551 -- Predicate to check whether S1 is a subtype of S2 in the source
8554 -------------------------
8555 -- Is_Declared_Subtype --
8556 -------------------------
8558 function Is_Declared_Subtype
(S1
, S2
: Entity_Id
) return Boolean is
8560 return Comes_From_Source
(Parent
(S1
))
8561 and then Nkind
(Parent
(S1
)) = N_Subtype_Declaration
8562 and then Is_Entity_Name
(Subtype_Indication
(Parent
(S1
)))
8563 and then Entity
(Subtype_Indication
(Parent
(S1
))) = S2
;
8564 end Is_Declared_Subtype
;
8566 -- Start of processing for Same_Generic_Actual
8569 return Is_Generic_Actual_Type
(T1
) = Is_Generic_Actual_Type
(T2
)
8570 or else Is_Declared_Subtype
(T1
, T2
)
8571 or else Is_Declared_Subtype
(T2
, T1
);
8572 end Same_Generic_Actual
;
8574 -- Start of processing for Different_Generic_Profile
8577 if not In_Instance
then
8580 elsif Ekind
(E
) = E_Function
8581 and then not Same_Generic_Actual
(Etype
(E
), Etype
(Designator
))
8586 F1
:= First_Formal
(Designator
);
8587 F2
:= First_Formal
(E
);
8588 while Present
(F1
) loop
8589 if not Same_Generic_Actual
(Etype
(F1
), Etype
(F2
)) then
8598 end Different_Generic_Profile
;
8600 -- Start of processing for Find_Corresponding_Spec
8603 E
:= Current_Entity
(Designator
);
8604 while Present
(E
) loop
8606 -- We are looking for a matching spec. It must have the same scope,
8607 -- and the same name, and either be type conformant, or be the case
8608 -- of a library procedure spec and its body (which belong to one
8609 -- another regardless of whether they are type conformant or not).
8611 if Scope
(E
) = Current_Scope
then
8612 if Current_Scope
= Standard_Standard
8613 or else (Ekind
(E
) = Ekind
(Designator
)
8614 and then Type_Conformant
(E
, Designator
))
8616 -- Within an instantiation, we know that spec and body are
8617 -- subtype conformant, because they were subtype conformant in
8618 -- the generic. We choose the subtype-conformant entity here as
8619 -- well, to resolve spurious ambiguities in the instance that
8620 -- were not present in the generic (i.e. when two different
8621 -- types are given the same actual). If we are looking for a
8622 -- spec to match a body, full conformance is expected.
8626 -- Inherit the convention and "ghostness" of the matching
8627 -- spec to ensure proper full and subtype conformance.
8629 Set_Convention
(Designator
, Convention
(E
));
8631 -- Skip past subprogram bodies and subprogram renamings that
8632 -- may appear to have a matching spec, but that aren't fully
8633 -- conformant with it. That can occur in cases where an
8634 -- actual type causes unrelated homographs in the instance.
8636 if Nkind_In
(N
, N_Subprogram_Body
,
8637 N_Subprogram_Renaming_Declaration
)
8638 and then Present
(Homonym
(E
))
8639 and then not Fully_Conformant
(Designator
, E
)
8643 elsif not Subtype_Conformant
(Designator
, E
) then
8646 elsif Different_Generic_Profile
(E
) then
8651 -- Ada 2012 (AI05-0165): For internally generated bodies of
8652 -- null procedures locate the internally generated spec. We
8653 -- enforce mode conformance since a tagged type may inherit
8654 -- from interfaces several null primitives which differ only
8655 -- in the mode of the formals.
8657 if not (Comes_From_Source
(E
))
8658 and then Is_Null_Procedure
(E
)
8659 and then not Mode_Conformant
(Designator
, E
)
8663 -- For null procedures coming from source that are completions,
8664 -- analysis of the generated body will establish the link.
8666 elsif Comes_From_Source
(E
)
8667 and then Nkind
(Spec
) = N_Procedure_Specification
8668 and then Null_Present
(Spec
)
8672 -- Expression functions can be completions, but cannot be
8673 -- completed by an explicit body.
8675 elsif Comes_From_Source
(E
)
8676 and then Comes_From_Source
(N
)
8677 and then Nkind
(N
) = N_Subprogram_Body
8678 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
8679 N_Expression_Function
8681 Error_Msg_Sloc
:= Sloc
(E
);
8682 Error_Msg_N
("body conflicts with expression function#", N
);
8685 elsif not Has_Completion
(E
) then
8686 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
8687 Set_Corresponding_Spec
(N
, E
);
8690 Set_Has_Completion
(E
);
8693 elsif Nkind
(Parent
(N
)) = N_Subunit
then
8695 -- If this is the proper body of a subunit, the completion
8696 -- flag is set when analyzing the stub.
8700 -- If E is an internal function with a controlling result that
8701 -- was created for an operation inherited by a null extension,
8702 -- it may be overridden by a body without a previous spec (one
8703 -- more reason why these should be shunned). In that case we
8704 -- remove the generated body if present, because the current
8705 -- one is the explicit overriding.
8707 elsif Ekind
(E
) = E_Function
8708 and then Ada_Version
>= Ada_2005
8709 and then not Comes_From_Source
(E
)
8710 and then Has_Controlling_Result
(E
)
8711 and then Is_Null_Extension
(Etype
(E
))
8712 and then Comes_From_Source
(Spec
)
8714 Set_Has_Completion
(E
, False);
8717 and then Nkind
(Parent
(E
)) = N_Function_Specification
8720 (Unit_Declaration_Node
8721 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
8725 -- If expansion is disabled, or if the wrapper function has
8726 -- not been generated yet, this a late body overriding an
8727 -- inherited operation, or it is an overriding by some other
8728 -- declaration before the controlling result is frozen. In
8729 -- either case this is a declaration of a new entity.
8735 -- If the body already exists, then this is an error unless
8736 -- the previous declaration is the implicit declaration of a
8737 -- derived subprogram. It is also legal for an instance to
8738 -- contain type conformant overloadable declarations (but the
8739 -- generic declaration may not), per 8.3(26/2).
8741 elsif No
(Alias
(E
))
8742 and then not Is_Intrinsic_Subprogram
(E
)
8743 and then not In_Instance
8746 Error_Msg_Sloc
:= Sloc
(E
);
8748 if Is_Imported
(E
) then
8750 ("body not allowed for imported subprogram & declared#",
8753 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
8757 -- Child units cannot be overloaded, so a conformance mismatch
8758 -- between body and a previous spec is an error.
8760 elsif Is_Child_Unit
(E
)
8762 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
8764 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
8769 ("body of child unit does not match previous declaration", N
);
8777 -- On exit, we know that no previous declaration of subprogram exists
8780 end Find_Corresponding_Spec
;
8782 ----------------------
8783 -- Fully_Conformant --
8784 ----------------------
8786 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
8789 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
8791 end Fully_Conformant
;
8793 ----------------------------------
8794 -- Fully_Conformant_Expressions --
8795 ----------------------------------
8797 function Fully_Conformant_Expressions
8798 (Given_E1
: Node_Id
;
8799 Given_E2
: Node_Id
) return Boolean
8801 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
8802 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
8803 -- We always test conformance on original nodes, since it is possible
8804 -- for analysis and/or expansion to make things look as though they
8805 -- conform when they do not, e.g. by converting 1+2 into 3.
8807 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
8808 renames Fully_Conformant_Expressions
;
8810 function FCL
(L1
, L2
: List_Id
) return Boolean;
8811 -- Compare elements of two lists for conformance. Elements have to be
8812 -- conformant, and actuals inserted as default parameters do not match
8813 -- explicit actuals with the same value.
8815 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
8816 -- Compare an operator node with a function call
8822 function FCL
(L1
, L2
: List_Id
) return Boolean is
8826 if L1
= No_List
then
8832 if L2
= No_List
then
8838 -- Compare two lists, skipping rewrite insertions (we want to compare
8839 -- the original trees, not the expanded versions).
8842 if Is_Rewrite_Insertion
(N1
) then
8844 elsif Is_Rewrite_Insertion
(N2
) then
8850 elsif not FCE
(N1
, N2
) then
8863 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
8864 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
8869 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
8874 Act
:= First
(Actuals
);
8876 if Nkind
(Op_Node
) in N_Binary_Op
then
8877 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
8884 return Present
(Act
)
8885 and then FCE
(Right_Opnd
(Op_Node
), Act
)
8886 and then No
(Next
(Act
));
8890 -- Start of processing for Fully_Conformant_Expressions
8893 -- Nonconformant if paren count does not match. Note: if some idiot
8894 -- complains that we don't do this right for more than 3 levels of
8895 -- parentheses, they will be treated with the respect they deserve.
8897 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
8900 -- If same entities are referenced, then they are conformant even if
8901 -- they have different forms (RM 8.3.1(19-20)).
8903 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
8904 if Present
(Entity
(E1
)) then
8905 return Entity
(E1
) = Entity
(E2
)
8907 -- One may be a discriminant that has been replaced by the
8908 -- corresponding discriminal.
8911 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8912 and then Ekind
(Entity
(E1
)) = E_Discriminant
8913 and then Ekind
(Entity
(E2
)) = E_In_Parameter
)
8915 -- The discriminant of a protected type is transformed into
8916 -- a local constant and then into a parameter of a protected
8920 (Ekind
(Entity
(E1
)) = E_Constant
8921 and then Ekind
(Entity
(E2
)) = E_In_Parameter
8922 and then Present
(Discriminal_Link
(Entity
(E1
)))
8923 and then Discriminal_Link
(Entity
(E1
)) =
8924 Discriminal_Link
(Entity
(E2
)))
8926 -- AI12-050: The loop variables of quantified expressions
8927 -- match if they have the same identifier, even though they
8928 -- are different entities.
8931 (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
8932 and then Ekind
(Entity
(E1
)) = E_Loop_Parameter
8933 and then Ekind
(Entity
(E2
)) = E_Loop_Parameter
);
8935 elsif Nkind
(E1
) = N_Expanded_Name
8936 and then Nkind
(E2
) = N_Expanded_Name
8937 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8938 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8940 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
8943 -- Identifiers in component associations don't always have
8944 -- entities, but their names must conform.
8946 return Nkind
(E1
) = N_Identifier
8947 and then Nkind
(E2
) = N_Identifier
8948 and then Chars
(E1
) = Chars
(E2
);
8951 elsif Nkind
(E1
) = N_Character_Literal
8952 and then Nkind
(E2
) = N_Expanded_Name
8954 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
8955 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
8957 elsif Nkind
(E2
) = N_Character_Literal
8958 and then Nkind
(E1
) = N_Expanded_Name
8960 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
8961 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
8963 elsif Nkind
(E1
) in N_Op
and then Nkind
(E2
) = N_Function_Call
then
8964 return FCO
(E1
, E2
);
8966 elsif Nkind
(E2
) in N_Op
and then Nkind
(E1
) = N_Function_Call
then
8967 return FCO
(E2
, E1
);
8969 -- Otherwise we must have the same syntactic entity
8971 elsif Nkind
(E1
) /= Nkind
(E2
) then
8974 -- At this point, we specialize by node type
8980 FCL
(Expressions
(E1
), Expressions
(E2
))
8982 FCL
(Component_Associations
(E1
),
8983 Component_Associations
(E2
));
8986 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
8988 Nkind
(Expression
(E2
)) = N_Qualified_Expression
8990 return FCE
(Expression
(E1
), Expression
(E2
));
8992 -- Check that the subtype marks and any constraints
8997 Indic1
: constant Node_Id
:= Expression
(E1
);
8998 Indic2
: constant Node_Id
:= Expression
(E2
);
9003 if Nkind
(Indic1
) /= N_Subtype_Indication
then
9005 Nkind
(Indic2
) /= N_Subtype_Indication
9006 and then Entity
(Indic1
) = Entity
(Indic2
);
9008 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
9010 Nkind
(Indic1
) /= N_Subtype_Indication
9011 and then Entity
(Indic1
) = Entity
(Indic2
);
9014 if Entity
(Subtype_Mark
(Indic1
)) /=
9015 Entity
(Subtype_Mark
(Indic2
))
9020 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
9021 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
9022 while Present
(Elt1
) and then Present
(Elt2
) loop
9023 if not FCE
(Elt1
, Elt2
) then
9036 when N_Attribute_Reference
=>
9038 Attribute_Name
(E1
) = Attribute_Name
(E2
)
9039 and then FCL
(Expressions
(E1
), Expressions
(E2
));
9043 Entity
(E1
) = Entity
(E2
)
9044 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9045 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9047 when N_Membership_Test
9051 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
9053 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9055 when N_Case_Expression
=>
9061 if not FCE
(Expression
(E1
), Expression
(E2
)) then
9065 Alt1
:= First
(Alternatives
(E1
));
9066 Alt2
:= First
(Alternatives
(E2
));
9068 if Present
(Alt1
) /= Present
(Alt2
) then
9070 elsif No
(Alt1
) then
9074 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
9075 or else not FCL
(Discrete_Choices
(Alt1
),
9076 Discrete_Choices
(Alt2
))
9087 when N_Character_Literal
=>
9089 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
9091 when N_Component_Association
=>
9093 FCL
(Choices
(E1
), Choices
(E2
))
9095 FCE
(Expression
(E1
), Expression
(E2
));
9097 when N_Explicit_Dereference
=>
9099 FCE
(Prefix
(E1
), Prefix
(E2
));
9101 when N_Extension_Aggregate
=>
9103 FCL
(Expressions
(E1
), Expressions
(E2
))
9104 and then Null_Record_Present
(E1
) =
9105 Null_Record_Present
(E2
)
9106 and then FCL
(Component_Associations
(E1
),
9107 Component_Associations
(E2
));
9109 when N_Function_Call
=>
9111 FCE
(Name
(E1
), Name
(E2
))
9113 FCL
(Parameter_Associations
(E1
),
9114 Parameter_Associations
(E2
));
9116 when N_If_Expression
=>
9118 FCL
(Expressions
(E1
), Expressions
(E2
));
9120 when N_Indexed_Component
=>
9122 FCE
(Prefix
(E1
), Prefix
(E2
))
9124 FCL
(Expressions
(E1
), Expressions
(E2
));
9126 when N_Integer_Literal
=>
9127 return (Intval
(E1
) = Intval
(E2
));
9132 when N_Operator_Symbol
=>
9134 Chars
(E1
) = Chars
(E2
);
9136 when N_Others_Choice
=>
9139 when N_Parameter_Association
=>
9141 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
9142 and then FCE
(Explicit_Actual_Parameter
(E1
),
9143 Explicit_Actual_Parameter
(E2
));
9145 when N_Qualified_Expression
9147 | N_Unchecked_Type_Conversion
9150 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
9152 FCE
(Expression
(E1
), Expression
(E2
));
9154 when N_Quantified_Expression
=>
9155 if not FCE
(Condition
(E1
), Condition
(E2
)) then
9159 if Present
(Loop_Parameter_Specification
(E1
))
9160 and then Present
(Loop_Parameter_Specification
(E2
))
9163 L1
: constant Node_Id
:=
9164 Loop_Parameter_Specification
(E1
);
9165 L2
: constant Node_Id
:=
9166 Loop_Parameter_Specification
(E2
);
9170 Reverse_Present
(L1
) = Reverse_Present
(L2
)
9172 FCE
(Defining_Identifier
(L1
),
9173 Defining_Identifier
(L2
))
9175 FCE
(Discrete_Subtype_Definition
(L1
),
9176 Discrete_Subtype_Definition
(L2
));
9179 elsif Present
(Iterator_Specification
(E1
))
9180 and then Present
(Iterator_Specification
(E2
))
9183 I1
: constant Node_Id
:= Iterator_Specification
(E1
);
9184 I2
: constant Node_Id
:= Iterator_Specification
(E2
);
9188 FCE
(Defining_Identifier
(I1
),
9189 Defining_Identifier
(I2
))
9191 Of_Present
(I1
) = Of_Present
(I2
)
9193 Reverse_Present
(I1
) = Reverse_Present
(I2
)
9194 and then FCE
(Name
(I1
), Name
(I2
))
9195 and then FCE
(Subtype_Indication
(I1
),
9196 Subtype_Indication
(I2
));
9199 -- The quantified expressions used different specifications to
9200 -- walk their respective ranges.
9208 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
9210 FCE
(High_Bound
(E1
), High_Bound
(E2
));
9212 when N_Real_Literal
=>
9213 return (Realval
(E1
) = Realval
(E2
));
9215 when N_Selected_Component
=>
9217 FCE
(Prefix
(E1
), Prefix
(E2
))
9219 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
9223 FCE
(Prefix
(E1
), Prefix
(E2
))
9225 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
9227 when N_String_Literal
=>
9229 S1
: constant String_Id
:= Strval
(E1
);
9230 S2
: constant String_Id
:= Strval
(E2
);
9231 L1
: constant Nat
:= String_Length
(S1
);
9232 L2
: constant Nat
:= String_Length
(S2
);
9239 for J
in 1 .. L1
loop
9240 if Get_String_Char
(S1
, J
) /=
9241 Get_String_Char
(S2
, J
)
9253 Entity
(E1
) = Entity
(E2
)
9255 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
9257 -- All other node types cannot appear in this context. Strictly
9258 -- we should raise a fatal internal error. Instead we just ignore
9259 -- the nodes. This means that if anyone makes a mistake in the
9260 -- expander and mucks an expression tree irretrievably, the result
9261 -- will be a failure to detect a (probably very obscure) case
9262 -- of non-conformance, which is better than bombing on some
9263 -- case where two expressions do in fact conform.
9269 end Fully_Conformant_Expressions
;
9271 ----------------------------------------
9272 -- Fully_Conformant_Discrete_Subtypes --
9273 ----------------------------------------
9275 function Fully_Conformant_Discrete_Subtypes
9276 (Given_S1
: Node_Id
;
9277 Given_S2
: Node_Id
) return Boolean
9279 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
9280 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
9282 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
9283 -- Special-case for a bound given by a discriminant, which in the body
9284 -- is replaced with the discriminal of the enclosing type.
9286 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
9287 -- Check both bounds
9289 -----------------------
9290 -- Conforming_Bounds --
9291 -----------------------
9293 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
9295 if Is_Entity_Name
(B1
)
9296 and then Is_Entity_Name
(B2
)
9297 and then Ekind
(Entity
(B1
)) = E_Discriminant
9299 return Chars
(B1
) = Chars
(B2
);
9302 return Fully_Conformant_Expressions
(B1
, B2
);
9304 end Conforming_Bounds
;
9306 -----------------------
9307 -- Conforming_Ranges --
9308 -----------------------
9310 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
9313 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
9315 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
9316 end Conforming_Ranges
;
9318 -- Start of processing for Fully_Conformant_Discrete_Subtypes
9321 if Nkind
(S1
) /= Nkind
(S2
) then
9324 elsif Is_Entity_Name
(S1
) then
9325 return Entity
(S1
) = Entity
(S2
);
9327 elsif Nkind
(S1
) = N_Range
then
9328 return Conforming_Ranges
(S1
, S2
);
9330 elsif Nkind
(S1
) = N_Subtype_Indication
then
9332 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
9335 (Range_Expression
(Constraint
(S1
)),
9336 Range_Expression
(Constraint
(S2
)));
9340 end Fully_Conformant_Discrete_Subtypes
;
9342 --------------------
9343 -- Install_Entity --
9344 --------------------
9346 procedure Install_Entity
(E
: Entity_Id
) is
9347 Prev
: constant Entity_Id
:= Current_Entity
(E
);
9349 Set_Is_Immediately_Visible
(E
);
9350 Set_Current_Entity
(E
);
9351 Set_Homonym
(E
, Prev
);
9354 ---------------------
9355 -- Install_Formals --
9356 ---------------------
9358 procedure Install_Formals
(Id
: Entity_Id
) is
9361 F
:= First_Formal
(Id
);
9362 while Present
(F
) loop
9366 end Install_Formals
;
9368 -----------------------------
9369 -- Is_Interface_Conformant --
9370 -----------------------------
9372 function Is_Interface_Conformant
9373 (Tagged_Type
: Entity_Id
;
9374 Iface_Prim
: Entity_Id
;
9375 Prim
: Entity_Id
) return Boolean
9377 -- The operation may in fact be an inherited (implicit) operation
9378 -- rather than the original interface primitive, so retrieve the
9379 -- ultimate ancestor.
9381 Iface
: constant Entity_Id
:=
9382 Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
));
9383 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
9385 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
;
9386 -- Return the controlling formal of Prim
9388 ------------------------
9389 -- Controlling_Formal --
9390 ------------------------
9392 function Controlling_Formal
(Prim
: Entity_Id
) return Entity_Id
is
9396 E
:= First_Entity
(Prim
);
9397 while Present
(E
) loop
9398 if Is_Formal
(E
) and then Is_Controlling_Formal
(E
) then
9406 end Controlling_Formal
;
9410 Iface_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Iface_Prim
);
9411 Prim_Ctrl_F
: constant Entity_Id
:= Controlling_Formal
(Prim
);
9413 -- Start of processing for Is_Interface_Conformant
9416 pragma Assert
(Is_Subprogram
(Iface_Prim
)
9417 and then Is_Subprogram
(Prim
)
9418 and then Is_Dispatching_Operation
(Iface_Prim
)
9419 and then Is_Dispatching_Operation
(Prim
));
9421 pragma Assert
(Is_Interface
(Iface
)
9422 or else (Present
(Alias
(Iface_Prim
))
9425 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
9427 if Prim
= Iface_Prim
9428 or else not Is_Subprogram
(Prim
)
9429 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
9430 or else not Is_Dispatching_Operation
(Prim
)
9431 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
9433 or else Base_Type
(Typ
) /= Base_Type
(Tagged_Type
)
9434 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
9438 -- The mode of the controlling formals must match
9440 elsif Present
(Iface_Ctrl_F
)
9441 and then Present
(Prim_Ctrl_F
)
9442 and then Ekind
(Iface_Ctrl_F
) /= Ekind
(Prim_Ctrl_F
)
9446 -- Case of a procedure, or a function whose result type matches the
9447 -- result type of the interface primitive, or a function that has no
9448 -- controlling result (I or access I).
9450 elsif Ekind
(Iface_Prim
) = E_Procedure
9451 or else Etype
(Prim
) = Etype
(Iface_Prim
)
9452 or else not Has_Controlling_Result
(Prim
)
9454 return Type_Conformant
9455 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
9457 -- Case of a function returning an interface, or an access to one. Check
9458 -- that the return types correspond.
9460 elsif Implements_Interface
(Typ
, Iface
) then
9461 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
9463 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
9468 Type_Conformant
(Prim
, Ultimate_Alias
(Iface_Prim
),
9469 Skip_Controlling_Formals
=> True);
9475 end Is_Interface_Conformant
;
9477 ---------------------------------
9478 -- Is_Non_Overriding_Operation --
9479 ---------------------------------
9481 function Is_Non_Overriding_Operation
9482 (Prev_E
: Entity_Id
;
9483 New_E
: Entity_Id
) return Boolean
9487 G_Typ
: Entity_Id
:= Empty
;
9489 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
9490 -- If F_Type is a derived type associated with a generic actual subtype,
9491 -- then return its Generic_Parent_Type attribute, else return Empty.
9493 function Types_Correspond
9494 (P_Type
: Entity_Id
;
9495 N_Type
: Entity_Id
) return Boolean;
9496 -- Returns true if and only if the types (or designated types in the
9497 -- case of anonymous access types) are the same or N_Type is derived
9498 -- directly or indirectly from P_Type.
9500 -----------------------------
9501 -- Get_Generic_Parent_Type --
9502 -----------------------------
9504 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
9510 if Is_Derived_Type
(F_Typ
)
9511 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
9513 -- The tree must be traversed to determine the parent subtype in
9514 -- the generic unit, which unfortunately isn't always available
9515 -- via semantic attributes. ??? (Note: The use of Original_Node
9516 -- is needed for cases where a full derived type has been
9519 -- If the parent type is a scalar type, the derivation creates
9520 -- an anonymous base type for it, and the source type is its
9523 if Is_Scalar_Type
(F_Typ
)
9524 and then not Comes_From_Source
(F_Typ
)
9528 (Original_Node
(Parent
(First_Subtype
(F_Typ
))));
9530 Defn
:= Type_Definition
(Original_Node
(Parent
(F_Typ
)));
9532 if Nkind
(Defn
) = N_Derived_Type_Definition
then
9533 Indic
:= Subtype_Indication
(Defn
);
9535 if Nkind
(Indic
) = N_Subtype_Indication
then
9536 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
9538 G_Typ
:= Entity
(Indic
);
9541 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
9542 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
9544 return Generic_Parent_Type
(Parent
(G_Typ
));
9550 end Get_Generic_Parent_Type
;
9552 ----------------------
9553 -- Types_Correspond --
9554 ----------------------
9556 function Types_Correspond
9557 (P_Type
: Entity_Id
;
9558 N_Type
: Entity_Id
) return Boolean
9560 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
9561 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
9564 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
9565 Prev_Type
:= Designated_Type
(Prev_Type
);
9568 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
9569 New_Type
:= Designated_Type
(New_Type
);
9572 if Prev_Type
= New_Type
then
9575 elsif not Is_Class_Wide_Type
(New_Type
) then
9576 while Etype
(New_Type
) /= New_Type
loop
9577 New_Type
:= Etype
(New_Type
);
9579 if New_Type
= Prev_Type
then
9585 end Types_Correspond
;
9587 -- Start of processing for Is_Non_Overriding_Operation
9590 -- In the case where both operations are implicit derived subprograms
9591 -- then neither overrides the other. This can only occur in certain
9592 -- obscure cases (e.g., derivation from homographs created in a generic
9595 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
9598 elsif Ekind
(Current_Scope
) = E_Package
9599 and then Is_Generic_Instance
(Current_Scope
)
9600 and then In_Private_Part
(Current_Scope
)
9601 and then Comes_From_Source
(New_E
)
9603 -- We examine the formals and result type of the inherited operation,
9604 -- to determine whether their type is derived from (the instance of)
9605 -- a generic type. The first such formal or result type is the one
9608 Formal
:= First_Formal
(Prev_E
);
9610 while Present
(Formal
) loop
9611 F_Typ
:= Base_Type
(Etype
(Formal
));
9613 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
9614 F_Typ
:= Designated_Type
(F_Typ
);
9617 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
9618 exit when Present
(G_Typ
);
9620 Next_Formal
(Formal
);
9623 -- If the function dispatches on result check the result type
9625 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
9626 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
9633 -- If the generic type is a private type, then the original operation
9634 -- was not overriding in the generic, because there was no primitive
9635 -- operation to override.
9637 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
9638 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
9639 N_Formal_Private_Type_Definition
9643 -- The generic parent type is the ancestor of a formal derived
9644 -- type declaration. We need to check whether it has a primitive
9645 -- operation that should be overridden by New_E in the generic.
9649 P_Formal
: Entity_Id
;
9650 N_Formal
: Entity_Id
;
9654 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
9657 while Present
(Prim_Elt
) loop
9658 P_Prim
:= Node
(Prim_Elt
);
9660 if Chars
(P_Prim
) = Chars
(New_E
)
9661 and then Ekind
(P_Prim
) = Ekind
(New_E
)
9663 P_Formal
:= First_Formal
(P_Prim
);
9664 N_Formal
:= First_Formal
(New_E
);
9665 while Present
(P_Formal
) and then Present
(N_Formal
) loop
9666 P_Typ
:= Etype
(P_Formal
);
9667 N_Typ
:= Etype
(N_Formal
);
9669 if not Types_Correspond
(P_Typ
, N_Typ
) then
9673 Next_Entity
(P_Formal
);
9674 Next_Entity
(N_Formal
);
9677 -- Found a matching primitive operation belonging to the
9678 -- formal ancestor type, so the new subprogram is
9682 and then No
(N_Formal
)
9683 and then (Ekind
(New_E
) /= E_Function
9686 (Etype
(P_Prim
), Etype
(New_E
)))
9692 Next_Elmt
(Prim_Elt
);
9695 -- If no match found, then the new subprogram does not override
9696 -- in the generic (nor in the instance).
9698 -- If the type in question is not abstract, and the subprogram
9699 -- is, this will be an error if the new operation is in the
9700 -- private part of the instance. Emit a warning now, which will
9701 -- make the subsequent error message easier to understand.
9703 if Present
(F_Typ
) and then not Is_Abstract_Type
(F_Typ
)
9704 and then Is_Abstract_Subprogram
(Prev_E
)
9705 and then In_Private_Part
(Current_Scope
)
9707 Error_Msg_Node_2
:= F_Typ
;
9709 ("private operation& in generic unit does not override "
9710 & "any primitive operation of& (RM 12.3 (18))??",
9720 end Is_Non_Overriding_Operation
;
9722 -------------------------------------
9723 -- List_Inherited_Pre_Post_Aspects --
9724 -------------------------------------
9726 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
9728 if Opt
.List_Inherited_Aspects
9729 and then Is_Subprogram_Or_Generic_Subprogram
(E
)
9732 Subps
: constant Subprogram_List
:= Inherited_Subprograms
(E
);
9737 for Index
in Subps
'Range loop
9738 Items
:= Contract
(Subps
(Index
));
9740 if Present
(Items
) then
9741 Prag
:= Pre_Post_Conditions
(Items
);
9742 while Present
(Prag
) loop
9743 Error_Msg_Sloc
:= Sloc
(Prag
);
9745 if Class_Present
(Prag
)
9746 and then not Split_PPC
(Prag
)
9748 if Pragma_Name
(Prag
) = Name_Precondition
then
9750 ("info: & inherits `Pre''Class` aspect from "
9754 ("info: & inherits `Post''Class` aspect from "
9759 Prag
:= Next_Pragma
(Prag
);
9765 end List_Inherited_Pre_Post_Aspects
;
9767 ------------------------------
9768 -- Make_Inequality_Operator --
9769 ------------------------------
9771 -- S is the defining identifier of an equality operator. We build a
9772 -- subprogram declaration with the right signature. This operation is
9773 -- intrinsic, because it is always expanded as the negation of the
9774 -- call to the equality function.
9776 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
9777 Loc
: constant Source_Ptr
:= Sloc
(S
);
9780 Op_Name
: Entity_Id
;
9782 FF
: constant Entity_Id
:= First_Formal
(S
);
9783 NF
: constant Entity_Id
:= Next_Formal
(FF
);
9786 -- Check that equality was properly defined, ignore call if not
9793 A
: constant Entity_Id
:=
9794 Make_Defining_Identifier
(Sloc
(FF
),
9795 Chars
=> Chars
(FF
));
9797 B
: constant Entity_Id
:=
9798 Make_Defining_Identifier
(Sloc
(NF
),
9799 Chars
=> Chars
(NF
));
9802 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
9804 Formals
:= New_List
(
9805 Make_Parameter_Specification
(Loc
,
9806 Defining_Identifier
=> A
,
9808 New_Occurrence_Of
(Etype
(First_Formal
(S
)),
9809 Sloc
(Etype
(First_Formal
(S
))))),
9811 Make_Parameter_Specification
(Loc
,
9812 Defining_Identifier
=> B
,
9814 New_Occurrence_Of
(Etype
(Next_Formal
(First_Formal
(S
))),
9815 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
9818 Make_Subprogram_Declaration
(Loc
,
9820 Make_Function_Specification
(Loc
,
9821 Defining_Unit_Name
=> Op_Name
,
9822 Parameter_Specifications
=> Formals
,
9823 Result_Definition
=>
9824 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
9826 -- Insert inequality right after equality if it is explicit or after
9827 -- the derived type when implicit. These entities are created only
9828 -- for visibility purposes, and eventually replaced in the course
9829 -- of expansion, so they do not need to be attached to the tree and
9830 -- seen by the back-end. Keeping them internal also avoids spurious
9831 -- freezing problems. The declaration is inserted in the tree for
9832 -- analysis, and removed afterwards. If the equality operator comes
9833 -- from an explicit declaration, attach the inequality immediately
9834 -- after. Else the equality is inherited from a derived type
9835 -- declaration, so insert inequality after that declaration.
9837 if No
(Alias
(S
)) then
9838 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
9839 elsif Is_List_Member
(Parent
(S
)) then
9840 Insert_After
(Parent
(S
), Decl
);
9842 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
9845 Mark_Rewrite_Insertion
(Decl
);
9846 Set_Is_Intrinsic_Subprogram
(Op_Name
);
9849 Set_Has_Completion
(Op_Name
);
9850 Set_Corresponding_Equality
(Op_Name
, S
);
9851 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
9853 end Make_Inequality_Operator
;
9855 ----------------------
9856 -- May_Need_Actuals --
9857 ----------------------
9859 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
9864 F
:= First_Formal
(Fun
);
9866 while Present
(F
) loop
9867 if No
(Default_Value
(F
)) then
9875 Set_Needs_No_Actuals
(Fun
, B
);
9876 end May_Need_Actuals
;
9878 ---------------------
9879 -- Mode_Conformant --
9880 ---------------------
9882 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
9885 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
9887 end Mode_Conformant
;
9889 ---------------------------
9890 -- New_Overloaded_Entity --
9891 ---------------------------
9893 procedure New_Overloaded_Entity
9895 Derived_Type
: Entity_Id
:= Empty
)
9897 Overridden_Subp
: Entity_Id
:= Empty
;
9898 -- Set if the current scope has an operation that is type-conformant
9899 -- with S, and becomes hidden by S.
9901 Is_Primitive_Subp
: Boolean;
9902 -- Set to True if the new subprogram is primitive
9905 -- Entity that S overrides
9907 Prev_Vis
: Entity_Id
:= Empty
;
9908 -- Predecessor of E in Homonym chain
9910 procedure Check_For_Primitive_Subprogram
9911 (Is_Primitive
: out Boolean;
9912 Is_Overriding
: Boolean := False);
9913 -- If the subprogram being analyzed is a primitive operation of the type
9914 -- of a formal or result, set the Has_Primitive_Operations flag on the
9915 -- type, and set Is_Primitive to True (otherwise set to False). Set the
9916 -- corresponding flag on the entity itself for later use.
9918 function Has_Matching_Entry_Or_Subprogram
(E
: Entity_Id
) return Boolean;
9919 -- True if a) E is a subprogram whose first formal is a concurrent type
9920 -- defined in the scope of E that has some entry or subprogram whose
9921 -- profile matches E, or b) E is an internally built dispatching
9922 -- subprogram of a protected type and there is a matching subprogram
9923 -- defined in the enclosing scope of the protected type, or c) E is
9924 -- an entry of a synchronized type and a matching procedure has been
9925 -- previously defined in the enclosing scope of the synchronized type.
9927 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
9928 -- Check that E is declared in the private part of the current package,
9929 -- or in the package body, where it may hide a previous declaration.
9930 -- We can't use In_Private_Part by itself because this flag is also
9931 -- set when freezing entities, so we must examine the place of the
9932 -- declaration in the tree, and recognize wrapper packages as well.
9934 function Is_Overriding_Alias
9936 New_E
: Entity_Id
) return Boolean;
9937 -- Check whether new subprogram and old subprogram are both inherited
9938 -- from subprograms that have distinct dispatch table entries. This can
9939 -- occur with derivations from instances with accidental homonyms. The
9940 -- function is conservative given that the converse is only true within
9941 -- instances that contain accidental overloadings.
9943 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
);
9944 -- Report conflict between entities S and E
9946 ------------------------------------
9947 -- Check_For_Primitive_Subprogram --
9948 ------------------------------------
9950 procedure Check_For_Primitive_Subprogram
9951 (Is_Primitive
: out Boolean;
9952 Is_Overriding
: Boolean := False)
9958 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
9959 -- Returns true if T is declared in the visible part of the current
9960 -- package scope; otherwise returns false. Assumes that T is declared
9963 procedure Check_Private_Overriding
(T
: Entity_Id
);
9964 -- Checks that if a primitive abstract subprogram of a visible
9965 -- abstract type is declared in a private part, then it must override
9966 -- an abstract subprogram declared in the visible part. Also checks
9967 -- that if a primitive function with a controlling result is declared
9968 -- in a private part, then it must override a function declared in
9969 -- the visible part.
9971 ------------------------------
9972 -- Check_Private_Overriding --
9973 ------------------------------
9975 procedure Check_Private_Overriding
(T
: Entity_Id
) is
9976 function Overrides_Private_Part_Op
return Boolean;
9977 -- This detects the special case where the overriding subprogram
9978 -- is overriding a subprogram that was declared in the same
9979 -- private part. That case is illegal by 3.9.3(10).
9981 function Overrides_Visible_Function
9982 (Partial_View
: Entity_Id
) return Boolean;
9983 -- True if S overrides a function in the visible part. The
9984 -- overridden function could be explicitly or implicitly declared.
9986 -------------------------------
9987 -- Overrides_Private_Part_Op --
9988 -------------------------------
9990 function Overrides_Private_Part_Op
return Boolean is
9991 Over_Decl
: constant Node_Id
:=
9992 Unit_Declaration_Node
(Overridden_Operation
(S
));
9993 Subp_Decl
: constant Node_Id
:= Unit_Declaration_Node
(S
);
9996 pragma Assert
(Is_Overriding
);
9998 (Nkind
(Over_Decl
) = N_Abstract_Subprogram_Declaration
);
10000 (Nkind
(Subp_Decl
) = N_Abstract_Subprogram_Declaration
);
10002 return In_Same_List
(Over_Decl
, Subp_Decl
);
10003 end Overrides_Private_Part_Op
;
10005 --------------------------------
10006 -- Overrides_Visible_Function --
10007 --------------------------------
10009 function Overrides_Visible_Function
10010 (Partial_View
: Entity_Id
) return Boolean
10013 if not Is_Overriding
or else not Has_Homonym
(S
) then
10017 if not Present
(Partial_View
) then
10021 -- Search through all the homonyms H of S in the current
10022 -- package spec, and return True if we find one that matches.
10023 -- Note that Parent (H) will be the declaration of the
10024 -- partial view of T for a match.
10027 H
: Entity_Id
:= S
;
10031 exit when not Present
(H
) or else Scope
(H
) /= Scope
(S
);
10035 N_Private_Extension_Declaration
,
10036 N_Private_Type_Declaration
)
10037 and then Defining_Identifier
(Parent
(H
)) = Partial_View
10045 end Overrides_Visible_Function
;
10047 -- Start of processing for Check_Private_Overriding
10050 if Is_Package_Or_Generic_Package
(Current_Scope
)
10051 and then In_Private_Part
(Current_Scope
)
10052 and then Visible_Part_Type
(T
)
10053 and then not In_Instance
10055 if Is_Abstract_Type
(T
)
10056 and then Is_Abstract_Subprogram
(S
)
10057 and then (not Is_Overriding
10058 or else not Is_Abstract_Subprogram
(E
)
10059 or else Overrides_Private_Part_Op
)
10062 ("abstract subprograms must be visible (RM 3.9.3(10))!",
10065 elsif Ekind
(S
) = E_Function
then
10067 Partial_View
: constant Entity_Id
:=
10068 Incomplete_Or_Partial_View
(T
);
10071 if not Overrides_Visible_Function
(Partial_View
) then
10073 -- Here, S is "function ... return T;" declared in
10074 -- the private part, not overriding some visible
10075 -- operation. That's illegal in the tagged case
10076 -- (but not if the private type is untagged).
10078 if ((Present
(Partial_View
)
10079 and then Is_Tagged_Type
(Partial_View
))
10080 or else (not Present
(Partial_View
)
10081 and then Is_Tagged_Type
(T
)))
10082 and then T
= Base_Type
(Etype
(S
))
10085 ("private function with tagged result must"
10086 & " override visible-part function", S
);
10088 ("\move subprogram to the visible part"
10089 & " (RM 3.9.3(10))", S
);
10091 -- AI05-0073: extend this test to the case of a
10092 -- function with a controlling access result.
10094 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
10095 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
10097 not Is_Class_Wide_Type
10098 (Designated_Type
(Etype
(S
)))
10099 and then Ada_Version
>= Ada_2012
10102 ("private function with controlling access "
10103 & "result must override visible-part function",
10106 ("\move subprogram to the visible part"
10107 & " (RM 3.9.3(10))", S
);
10113 end Check_Private_Overriding
;
10115 -----------------------
10116 -- Visible_Part_Type --
10117 -----------------------
10119 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
10120 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
10124 -- If the entity is a private type, then it must be declared in a
10127 if Ekind
(T
) in Private_Kind
then
10131 -- Otherwise, we traverse the visible part looking for its
10132 -- corresponding declaration. We cannot use the declaration
10133 -- node directly because in the private part the entity of a
10134 -- private type is the one in the full view, which does not
10135 -- indicate that it is the completion of something visible.
10137 N
:= First
(Visible_Declarations
(Specification
(P
)));
10138 while Present
(N
) loop
10139 if Nkind
(N
) = N_Full_Type_Declaration
10140 and then Present
(Defining_Identifier
(N
))
10141 and then T
= Defining_Identifier
(N
)
10145 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
10146 N_Private_Extension_Declaration
)
10147 and then Present
(Defining_Identifier
(N
))
10148 and then T
= Full_View
(Defining_Identifier
(N
))
10157 end Visible_Part_Type
;
10159 -- Start of processing for Check_For_Primitive_Subprogram
10162 Is_Primitive
:= False;
10164 if not Comes_From_Source
(S
) then
10167 -- If subprogram is at library level, it is not primitive operation
10169 elsif Current_Scope
= Standard_Standard
then
10172 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
10173 and then not In_Package_Body
(Current_Scope
))
10174 or else Is_Overriding
10176 -- For function, check return type
10178 if Ekind
(S
) = E_Function
then
10179 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
10180 F_Typ
:= Designated_Type
(Etype
(S
));
10182 F_Typ
:= Etype
(S
);
10185 B_Typ
:= Base_Type
(F_Typ
);
10187 if Scope
(B_Typ
) = Current_Scope
10188 and then not Is_Class_Wide_Type
(B_Typ
)
10189 and then not Is_Generic_Type
(B_Typ
)
10191 Is_Primitive
:= True;
10192 Set_Has_Primitive_Operations
(B_Typ
);
10193 Set_Is_Primitive
(S
);
10194 Check_Private_Overriding
(B_Typ
);
10196 -- The Ghost policy in effect at the point of declaration
10197 -- or a tagged type and a primitive operation must match
10198 -- (SPARK RM 6.9(16)).
10200 Check_Ghost_Primitive
(S
, B_Typ
);
10204 -- For all subprograms, check formals
10206 Formal
:= First_Formal
(S
);
10207 while Present
(Formal
) loop
10208 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
10209 F_Typ
:= Designated_Type
(Etype
(Formal
));
10211 F_Typ
:= Etype
(Formal
);
10214 B_Typ
:= Base_Type
(F_Typ
);
10216 if Ekind
(B_Typ
) = E_Access_Subtype
then
10217 B_Typ
:= Base_Type
(B_Typ
);
10220 if Scope
(B_Typ
) = Current_Scope
10221 and then not Is_Class_Wide_Type
(B_Typ
)
10222 and then not Is_Generic_Type
(B_Typ
)
10224 Is_Primitive
:= True;
10225 Set_Is_Primitive
(S
);
10226 Set_Has_Primitive_Operations
(B_Typ
);
10227 Check_Private_Overriding
(B_Typ
);
10229 -- The Ghost policy in effect at the point of declaration
10230 -- of a tagged type and a primitive operation must match
10231 -- (SPARK RM 6.9(16)).
10233 Check_Ghost_Primitive
(S
, B_Typ
);
10236 Next_Formal
(Formal
);
10239 -- Special case: An equality function can be redefined for a type
10240 -- occurring in a declarative part, and won't otherwise be treated as
10241 -- a primitive because it doesn't occur in a package spec and doesn't
10242 -- override an inherited subprogram. It's important that we mark it
10243 -- primitive so it can be returned by Collect_Primitive_Operations
10244 -- and be used in composing the equality operation of later types
10245 -- that have a component of the type.
10247 elsif Chars
(S
) = Name_Op_Eq
10248 and then Etype
(S
) = Standard_Boolean
10250 B_Typ
:= Base_Type
(Etype
(First_Formal
(S
)));
10252 if Scope
(B_Typ
) = Current_Scope
10254 Base_Type
(Etype
(Next_Formal
(First_Formal
(S
)))) = B_Typ
10255 and then not Is_Limited_Type
(B_Typ
)
10257 Is_Primitive
:= True;
10258 Set_Is_Primitive
(S
);
10259 Set_Has_Primitive_Operations
(B_Typ
);
10260 Check_Private_Overriding
(B_Typ
);
10262 -- The Ghost policy in effect at the point of declaration of a
10263 -- tagged type and a primitive operation must match
10264 -- (SPARK RM 6.9(16)).
10266 Check_Ghost_Primitive
(S
, B_Typ
);
10269 end Check_For_Primitive_Subprogram
;
10271 --------------------------------------
10272 -- Has_Matching_Entry_Or_Subprogram --
10273 --------------------------------------
10275 function Has_Matching_Entry_Or_Subprogram
10276 (E
: Entity_Id
) return Boolean
10278 function Check_Conforming_Parameters
10279 (E1_Param
: Node_Id
;
10280 E2_Param
: Node_Id
) return Boolean;
10281 -- Starting from the given parameters, check that all the parameters
10282 -- of two entries or subprograms are subtype conformant. Used to skip
10283 -- the check on the controlling argument.
10285 function Matching_Entry_Or_Subprogram
10286 (Conc_Typ
: Entity_Id
;
10287 Subp
: Entity_Id
) return Entity_Id
;
10288 -- Return the first entry or subprogram of the given concurrent type
10289 -- whose name matches the name of Subp and has a profile conformant
10290 -- with Subp; return Empty if not found.
10292 function Matching_Dispatching_Subprogram
10293 (Conc_Typ
: Entity_Id
;
10294 Ent
: Entity_Id
) return Entity_Id
;
10295 -- Return the first dispatching primitive of Conc_Type defined in the
10296 -- enclosing scope of Conc_Type (i.e. before the full definition of
10297 -- this concurrent type) whose name matches the entry Ent and has a
10298 -- profile conformant with the profile of the corresponding (not yet
10299 -- built) dispatching primitive of Ent; return Empty if not found.
10301 function Matching_Original_Protected_Subprogram
10302 (Prot_Typ
: Entity_Id
;
10303 Subp
: Entity_Id
) return Entity_Id
;
10304 -- Return the first subprogram defined in the enclosing scope of
10305 -- Prot_Typ (before the full definition of this protected type)
10306 -- whose name matches the original name of Subp and has a profile
10307 -- conformant with the profile of Subp; return Empty if not found.
10309 ---------------------------------
10310 -- Check_Confirming_Parameters --
10311 ---------------------------------
10313 function Check_Conforming_Parameters
10314 (E1_Param
: Node_Id
;
10315 E2_Param
: Node_Id
) return Boolean
10317 Param_E1
: Node_Id
:= E1_Param
;
10318 Param_E2
: Node_Id
:= E2_Param
;
10321 while Present
(Param_E1
) and then Present
(Param_E2
) loop
10322 if Ekind
(Defining_Identifier
(Param_E1
)) /=
10323 Ekind
(Defining_Identifier
(Param_E2
))
10326 (Find_Parameter_Type
(Param_E1
),
10327 Find_Parameter_Type
(Param_E2
),
10328 Subtype_Conformant
)
10337 -- The candidate is not valid if one of the two lists contains
10338 -- more parameters than the other
10340 return No
(Param_E1
) and then No
(Param_E2
);
10341 end Check_Conforming_Parameters
;
10343 ----------------------------------
10344 -- Matching_Entry_Or_Subprogram --
10345 ----------------------------------
10347 function Matching_Entry_Or_Subprogram
10348 (Conc_Typ
: Entity_Id
;
10349 Subp
: Entity_Id
) return Entity_Id
10354 E
:= First_Entity
(Conc_Typ
);
10355 while Present
(E
) loop
10356 if Chars
(Subp
) = Chars
(E
)
10357 and then (Ekind
(E
) = E_Entry
or else Is_Subprogram
(E
))
10359 Check_Conforming_Parameters
10360 (First
(Parameter_Specifications
(Parent
(E
))),
10361 Next
(First
(Parameter_Specifications
(Parent
(Subp
)))))
10370 end Matching_Entry_Or_Subprogram
;
10372 -------------------------------------
10373 -- Matching_Dispatching_Subprogram --
10374 -------------------------------------
10376 function Matching_Dispatching_Subprogram
10377 (Conc_Typ
: Entity_Id
;
10378 Ent
: Entity_Id
) return Entity_Id
10383 -- Search for entities in the enclosing scope of this synchonized
10386 pragma Assert
(Is_Concurrent_Type
(Conc_Typ
));
10387 Push_Scope
(Scope
(Conc_Typ
));
10388 E
:= Current_Entity_In_Scope
(Ent
);
10391 while Present
(E
) loop
10392 if Scope
(E
) = Scope
(Conc_Typ
)
10393 and then Comes_From_Source
(E
)
10394 and then Ekind
(E
) = E_Procedure
10395 and then Present
(First_Entity
(E
))
10396 and then Is_Controlling_Formal
(First_Entity
(E
))
10397 and then Etype
(First_Entity
(E
)) = Conc_Typ
10399 Check_Conforming_Parameters
10400 (First
(Parameter_Specifications
(Parent
(Ent
))),
10401 Next
(First
(Parameter_Specifications
(Parent
(E
)))))
10410 end Matching_Dispatching_Subprogram
;
10412 --------------------------------------------
10413 -- Matching_Original_Protected_Subprogram --
10414 --------------------------------------------
10416 function Matching_Original_Protected_Subprogram
10417 (Prot_Typ
: Entity_Id
;
10418 Subp
: Entity_Id
) return Entity_Id
10420 ICF
: constant Boolean :=
10421 Is_Controlling_Formal
(First_Entity
(Subp
));
10425 -- Temporarily decorate the first parameter of Subp as controlling
10426 -- formal, required to invoke Subtype_Conformant.
10428 Set_Is_Controlling_Formal
(First_Entity
(Subp
));
10431 Current_Entity_In_Scope
(Original_Protected_Subprogram
(Subp
));
10433 while Present
(E
) loop
10434 if Scope
(E
) = Scope
(Prot_Typ
)
10435 and then Comes_From_Source
(E
)
10436 and then Ekind
(Subp
) = Ekind
(E
)
10437 and then Present
(First_Entity
(E
))
10438 and then Is_Controlling_Formal
(First_Entity
(E
))
10439 and then Etype
(First_Entity
(E
)) = Prot_Typ
10440 and then Subtype_Conformant
(Subp
, E
,
10441 Skip_Controlling_Formals
=> True)
10443 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10450 Set_Is_Controlling_Formal
(First_Entity
(Subp
), ICF
);
10453 end Matching_Original_Protected_Subprogram
;
10455 -- Start of processing for Has_Matching_Entry_Or_Subprogram
10458 -- Case 1: E is a subprogram whose first formal is a concurrent type
10459 -- defined in the scope of E that has an entry or subprogram whose
10460 -- profile matches E.
10462 if Comes_From_Source
(E
)
10463 and then Is_Subprogram
(E
)
10464 and then Present
(First_Entity
(E
))
10465 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10468 Scope
(Corresponding_Concurrent_Type
10469 (Etype
(First_Entity
(E
))))
10472 (Matching_Entry_Or_Subprogram
10473 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10476 Report_Conflict
(E
,
10477 Matching_Entry_Or_Subprogram
10478 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10483 -- Case 2: E is an internally built dispatching subprogram of a
10484 -- protected type and there is a subprogram defined in the enclosing
10485 -- scope of the protected type that has the original name of E and
10486 -- its profile is conformant with the profile of E. We check the
10487 -- name of the original protected subprogram associated with E since
10488 -- the expander builds dispatching primitives of protected functions
10489 -- and procedures with other names (see Exp_Ch9.Build_Selected_Name).
10491 elsif not Comes_From_Source
(E
)
10492 and then Is_Subprogram
(E
)
10493 and then Present
(First_Entity
(E
))
10494 and then Is_Concurrent_Record_Type
(Etype
(First_Entity
(E
)))
10495 and then Present
(Original_Protected_Subprogram
(E
))
10498 (Matching_Original_Protected_Subprogram
10499 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10502 Report_Conflict
(E
,
10503 Matching_Original_Protected_Subprogram
10504 (Corresponding_Concurrent_Type
(Etype
(First_Entity
(E
))),
10508 -- Case 3: E is an entry of a synchronized type and a matching
10509 -- procedure has been previously defined in the enclosing scope
10510 -- of the synchronized type.
10512 elsif Comes_From_Source
(E
)
10513 and then Ekind
(E
) = E_Entry
10515 Present
(Matching_Dispatching_Subprogram
(Current_Scope
, E
))
10517 Report_Conflict
(E
,
10518 Matching_Dispatching_Subprogram
(Current_Scope
, E
));
10523 end Has_Matching_Entry_Or_Subprogram
;
10525 ----------------------------
10526 -- Is_Private_Declaration --
10527 ----------------------------
10529 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
10530 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
10531 Priv_Decls
: List_Id
;
10534 if Is_Package_Or_Generic_Package
(Current_Scope
)
10535 and then In_Private_Part
(Current_Scope
)
10538 Private_Declarations
(Package_Specification
(Current_Scope
));
10540 return In_Package_Body
(Current_Scope
)
10542 (Is_List_Member
(Decl
)
10543 and then List_Containing
(Decl
) = Priv_Decls
)
10544 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
10546 Is_Compilation_Unit
10547 (Defining_Entity
(Parent
(Decl
)))
10548 and then List_Containing
(Parent
(Parent
(Decl
))) =
10553 end Is_Private_Declaration
;
10555 --------------------------
10556 -- Is_Overriding_Alias --
10557 --------------------------
10559 function Is_Overriding_Alias
10560 (Old_E
: Entity_Id
;
10561 New_E
: Entity_Id
) return Boolean
10563 AO
: constant Entity_Id
:= Alias
(Old_E
);
10564 AN
: constant Entity_Id
:= Alias
(New_E
);
10567 return Scope
(AO
) /= Scope
(AN
)
10568 or else No
(DTC_Entity
(AO
))
10569 or else No
(DTC_Entity
(AN
))
10570 or else DT_Position
(AO
) = DT_Position
(AN
);
10571 end Is_Overriding_Alias
;
10573 ---------------------
10574 -- Report_Conflict --
10575 ---------------------
10577 procedure Report_Conflict
(S
: Entity_Id
; E
: Entity_Id
) is
10579 Error_Msg_Sloc
:= Sloc
(E
);
10581 -- Generate message, with useful additional warning if in generic
10583 if Is_Generic_Unit
(E
) then
10584 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
10585 Error_Msg_N
("\& conflicts with declaration#", S
);
10587 Error_Msg_N
("& conflicts with declaration#", S
);
10589 end Report_Conflict
;
10591 -- Start of processing for New_Overloaded_Entity
10594 -- We need to look for an entity that S may override. This must be a
10595 -- homonym in the current scope, so we look for the first homonym of
10596 -- S in the current scope as the starting point for the search.
10598 E
:= Current_Entity_In_Scope
(S
);
10600 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
10601 -- They are directly added to the list of primitive operations of
10602 -- Derived_Type, unless this is a rederivation in the private part
10603 -- of an operation that was already derived in the visible part of
10604 -- the current package.
10606 if Ada_Version
>= Ada_2005
10607 and then Present
(Derived_Type
)
10608 and then Present
(Alias
(S
))
10609 and then Is_Dispatching_Operation
(Alias
(S
))
10610 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
10611 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
10613 -- For private types, when the full-view is processed we propagate to
10614 -- the full view the non-overridden entities whose attribute "alias"
10615 -- references an interface primitive. These entities were added by
10616 -- Derive_Subprograms to ensure that interface primitives are
10619 -- Inside_Freeze_Actions is non zero when S corresponds with an
10620 -- internal entity that links an interface primitive with its
10621 -- covering primitive through attribute Interface_Alias (see
10622 -- Add_Internal_Interface_Entities).
10624 if Inside_Freezing_Actions
= 0
10625 and then Is_Package_Or_Generic_Package
(Current_Scope
)
10626 and then In_Private_Part
(Current_Scope
)
10627 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
10628 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
10629 and then Full_View
(Defining_Identifier
(Parent
(E
)))
10630 = Defining_Identifier
(Parent
(S
))
10631 and then Alias
(E
) = Alias
(S
)
10633 Check_Operation_From_Private_View
(S
, E
);
10634 Set_Is_Dispatching_Operation
(S
);
10639 Enter_Overloaded_Entity
(S
);
10640 Check_Dispatching_Operation
(S
, Empty
);
10641 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10647 -- For synchronized types check conflicts of this entity with previously
10648 -- defined entities.
10650 if Ada_Version
>= Ada_2005
10651 and then Has_Matching_Entry_Or_Subprogram
(S
)
10656 -- If there is no homonym then this is definitely not overriding
10659 Enter_Overloaded_Entity
(S
);
10660 Check_Dispatching_Operation
(S
, Empty
);
10661 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
10663 -- If subprogram has an explicit declaration, check whether it has an
10664 -- overriding indicator.
10666 if Comes_From_Source
(S
) then
10667 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10669 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
10670 -- it may have overridden some hidden inherited primitive. Update
10671 -- Overridden_Subp to avoid spurious errors when checking the
10672 -- overriding indicator.
10674 if Ada_Version
>= Ada_2012
10675 and then No
(Overridden_Subp
)
10676 and then Is_Dispatching_Operation
(S
)
10677 and then Present
(Overridden_Operation
(S
))
10679 Overridden_Subp
:= Overridden_Operation
(S
);
10682 Check_Overriding_Indicator
10683 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
10685 -- The Ghost policy in effect at the point of declaration of a
10686 -- parent subprogram and an overriding subprogram must match
10687 -- (SPARK RM 6.9(17)).
10689 Check_Ghost_Overriding
(S
, Overridden_Subp
);
10692 -- If there is a homonym that is not overloadable, then we have an
10693 -- error, except for the special cases checked explicitly below.
10695 elsif not Is_Overloadable
(E
) then
10697 -- Check for spurious conflict produced by a subprogram that has the
10698 -- same name as that of the enclosing generic package. The conflict
10699 -- occurs within an instance, between the subprogram and the renaming
10700 -- declaration for the package. After the subprogram, the package
10701 -- renaming declaration becomes hidden.
10703 if Ekind
(E
) = E_Package
10704 and then Present
(Renamed_Object
(E
))
10705 and then Renamed_Object
(E
) = Current_Scope
10706 and then Nkind
(Parent
(Renamed_Object
(E
))) =
10707 N_Package_Specification
10708 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
10711 Set_Is_Immediately_Visible
(E
, False);
10712 Enter_Overloaded_Entity
(S
);
10713 Set_Homonym
(S
, Homonym
(E
));
10714 Check_Dispatching_Operation
(S
, Empty
);
10715 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
10717 -- If the subprogram is implicit it is hidden by the previous
10718 -- declaration. However if it is dispatching, it must appear in the
10719 -- dispatch table anyway, because it can be dispatched to even if it
10720 -- cannot be called directly.
10722 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
10723 Set_Scope
(S
, Current_Scope
);
10725 if Is_Dispatching_Operation
(Alias
(S
)) then
10726 Check_Dispatching_Operation
(S
, Empty
);
10732 Report_Conflict
(S
, E
);
10736 -- E exists and is overloadable
10739 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
10741 -- Loop through E and its homonyms to determine if any of them is
10742 -- the candidate for overriding by S.
10744 while Present
(E
) loop
10746 -- Definitely not interesting if not in the current scope
10748 if Scope
(E
) /= Current_Scope
then
10751 -- A function can overload the name of an abstract state. The
10752 -- state can be viewed as a function with a profile that cannot
10753 -- be matched by anything.
10755 elsif Ekind
(S
) = E_Function
10756 and then Ekind
(E
) = E_Abstract_State
10758 Enter_Overloaded_Entity
(S
);
10761 -- Ada 2012 (AI05-0165): For internally generated bodies of null
10762 -- procedures locate the internally generated spec. We enforce
10763 -- mode conformance since a tagged type may inherit from
10764 -- interfaces several null primitives which differ only in
10765 -- the mode of the formals.
10767 elsif not Comes_From_Source
(S
)
10768 and then Is_Null_Procedure
(S
)
10769 and then not Mode_Conformant
(E
, S
)
10773 -- Check if we have type conformance
10775 elsif Type_Conformant
(E
, S
) then
10777 -- If the old and new entities have the same profile and one
10778 -- is not the body of the other, then this is an error, unless
10779 -- one of them is implicitly declared.
10781 -- There are some cases when both can be implicit, for example
10782 -- when both a literal and a function that overrides it are
10783 -- inherited in a derivation, or when an inherited operation
10784 -- of a tagged full type overrides the inherited operation of
10785 -- a private extension. Ada 83 had a special rule for the
10786 -- literal case. In Ada 95, the later implicit operation hides
10787 -- the former, and the literal is always the former. In the
10788 -- odd case where both are derived operations declared at the
10789 -- same point, both operations should be declared, and in that
10790 -- case we bypass the following test and proceed to the next
10791 -- part. This can only occur for certain obscure cases in
10792 -- instances, when an operation on a type derived from a formal
10793 -- private type does not override a homograph inherited from
10794 -- the actual. In subsequent derivations of such a type, the
10795 -- DT positions of these operations remain distinct, if they
10798 if Present
(Alias
(S
))
10799 and then (No
(Alias
(E
))
10800 or else Comes_From_Source
(E
)
10801 or else Is_Abstract_Subprogram
(S
)
10803 (Is_Dispatching_Operation
(E
)
10804 and then Is_Overriding_Alias
(E
, S
)))
10805 and then Ekind
(E
) /= E_Enumeration_Literal
10807 -- When an derived operation is overloaded it may be due to
10808 -- the fact that the full view of a private extension
10809 -- re-inherits. It has to be dealt with.
10811 if Is_Package_Or_Generic_Package
(Current_Scope
)
10812 and then In_Private_Part
(Current_Scope
)
10814 Check_Operation_From_Private_View
(S
, E
);
10817 -- In any case the implicit operation remains hidden by the
10818 -- existing declaration, which is overriding. Indicate that
10819 -- E overrides the operation from which S is inherited.
10821 if Present
(Alias
(S
)) then
10822 Set_Overridden_Operation
(E
, Alias
(S
));
10823 Inherit_Subprogram_Contract
(E
, Alias
(S
));
10826 Set_Overridden_Operation
(E
, S
);
10827 Inherit_Subprogram_Contract
(E
, S
);
10830 if Comes_From_Source
(E
) then
10831 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
10833 -- The Ghost policy in effect at the point of declaration
10834 -- of a parent subprogram and an overriding subprogram
10835 -- must match (SPARK RM 6.9(17)).
10837 Check_Ghost_Overriding
(E
, S
);
10842 -- Within an instance, the renaming declarations for actual
10843 -- subprograms may become ambiguous, but they do not hide each
10846 elsif Ekind
(E
) /= E_Entry
10847 and then not Comes_From_Source
(E
)
10848 and then not Is_Generic_Instance
(E
)
10849 and then (Present
(Alias
(E
))
10850 or else Is_Intrinsic_Subprogram
(E
))
10851 and then (not In_Instance
10852 or else No
(Parent
(E
))
10853 or else Nkind
(Unit_Declaration_Node
(E
)) /=
10854 N_Subprogram_Renaming_Declaration
)
10856 -- A subprogram child unit is not allowed to override an
10857 -- inherited subprogram (10.1.1(20)).
10859 if Is_Child_Unit
(S
) then
10861 ("child unit overrides inherited subprogram in parent",
10866 if Is_Non_Overriding_Operation
(E
, S
) then
10867 Enter_Overloaded_Entity
(S
);
10869 if No
(Derived_Type
)
10870 or else Is_Tagged_Type
(Derived_Type
)
10872 Check_Dispatching_Operation
(S
, Empty
);
10878 -- E is a derived operation or an internal operator which
10879 -- is being overridden. Remove E from further visibility.
10880 -- Furthermore, if E is a dispatching operation, it must be
10881 -- replaced in the list of primitive operations of its type
10882 -- (see Override_Dispatching_Operation).
10884 Overridden_Subp
:= E
;
10890 Prev
:= First_Entity
(Current_Scope
);
10891 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
10892 Next_Entity
(Prev
);
10895 -- It is possible for E to be in the current scope and
10896 -- yet not in the entity chain. This can only occur in a
10897 -- generic context where E is an implicit concatenation
10898 -- in the formal part, because in a generic body the
10899 -- entity chain starts with the formals.
10901 -- In GNATprove mode, a wrapper for an operation with
10902 -- axiomatization may be a homonym of another declaration
10903 -- for an actual subprogram (needs refinement ???).
10907 and then GNATprove_Mode
10909 Nkind
(Original_Node
(Unit_Declaration_Node
(S
))) =
10910 N_Subprogram_Renaming_Declaration
10914 pragma Assert
(Chars
(E
) = Name_Op_Concat
);
10919 -- E must be removed both from the entity_list of the
10920 -- current scope, and from the visibility chain.
10922 if Debug_Flag_E
then
10923 Write_Str
("Override implicit operation ");
10924 Write_Int
(Int
(E
));
10928 -- If E is a predefined concatenation, it stands for four
10929 -- different operations. As a result, a single explicit
10930 -- declaration does not hide it. In a possible ambiguous
10931 -- situation, Disambiguate chooses the user-defined op,
10932 -- so it is correct to retain the previous internal one.
10934 if Chars
(E
) /= Name_Op_Concat
10935 or else Ekind
(E
) /= E_Operator
10937 -- For nondispatching derived operations that are
10938 -- overridden by a subprogram declared in the private
10939 -- part of a package, we retain the derived subprogram
10940 -- but mark it as not immediately visible. If the
10941 -- derived operation was declared in the visible part
10942 -- then this ensures that it will still be visible
10943 -- outside the package with the proper signature
10944 -- (calls from outside must also be directed to this
10945 -- version rather than the overriding one, unlike the
10946 -- dispatching case). Calls from inside the package
10947 -- will still resolve to the overriding subprogram
10948 -- since the derived one is marked as not visible
10949 -- within the package.
10951 -- If the private operation is dispatching, we achieve
10952 -- the overriding by keeping the implicit operation
10953 -- but setting its alias to be the overriding one. In
10954 -- this fashion the proper body is executed in all
10955 -- cases, but the original signature is used outside
10958 -- If the overriding is not in the private part, we
10959 -- remove the implicit operation altogether.
10961 if Is_Private_Declaration
(S
) then
10962 if not Is_Dispatching_Operation
(E
) then
10963 Set_Is_Immediately_Visible
(E
, False);
10965 -- Work done in Override_Dispatching_Operation,
10966 -- so nothing else needs to be done here.
10972 -- Find predecessor of E in Homonym chain
10974 if E
= Current_Entity
(E
) then
10977 Prev_Vis
:= Current_Entity
(E
);
10978 while Homonym
(Prev_Vis
) /= E
loop
10979 Prev_Vis
:= Homonym
(Prev_Vis
);
10983 if Prev_Vis
/= Empty
then
10985 -- Skip E in the visibility chain
10987 Set_Homonym
(Prev_Vis
, Homonym
(E
));
10990 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
10993 Set_Next_Entity
(Prev
, Next_Entity
(E
));
10995 if No
(Next_Entity
(Prev
)) then
10996 Set_Last_Entity
(Current_Scope
, Prev
);
11001 Enter_Overloaded_Entity
(S
);
11003 -- For entities generated by Derive_Subprograms the
11004 -- overridden operation is the inherited primitive
11005 -- (which is available through the attribute alias).
11007 if not (Comes_From_Source
(E
))
11008 and then Is_Dispatching_Operation
(E
)
11009 and then Find_Dispatching_Type
(E
) =
11010 Find_Dispatching_Type
(S
)
11011 and then Present
(Alias
(E
))
11012 and then Comes_From_Source
(Alias
(E
))
11014 Set_Overridden_Operation
(S
, Alias
(E
));
11015 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11017 -- Normal case of setting entity as overridden
11019 -- Note: Static_Initialization and Overridden_Operation
11020 -- attributes use the same field in subprogram entities.
11021 -- Static_Initialization is only defined for internal
11022 -- initialization procedures, where Overridden_Operation
11023 -- is irrelevant. Therefore the setting of this attribute
11024 -- must check whether the target is an init_proc.
11026 elsif not Is_Init_Proc
(S
) then
11027 Set_Overridden_Operation
(S
, E
);
11028 Inherit_Subprogram_Contract
(S
, E
);
11031 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
11033 -- The Ghost policy in effect at the point of declaration
11034 -- of a parent subprogram and an overriding subprogram
11035 -- must match (SPARK RM 6.9(17)).
11037 Check_Ghost_Overriding
(S
, E
);
11039 -- If S is a user-defined subprogram or a null procedure
11040 -- expanded to override an inherited null procedure, or a
11041 -- predefined dispatching primitive then indicate that E
11042 -- overrides the operation from which S is inherited.
11044 if Comes_From_Source
(S
)
11046 (Present
(Parent
(S
))
11048 Nkind
(Parent
(S
)) = N_Procedure_Specification
11050 Null_Present
(Parent
(S
)))
11052 (Present
(Alias
(E
))
11054 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
11056 if Present
(Alias
(E
)) then
11057 Set_Overridden_Operation
(S
, Alias
(E
));
11058 Inherit_Subprogram_Contract
(S
, Alias
(E
));
11062 if Is_Dispatching_Operation
(E
) then
11064 -- An overriding dispatching subprogram inherits the
11065 -- convention of the overridden subprogram (AI-117).
11067 Set_Convention
(S
, Convention
(E
));
11068 Check_Dispatching_Operation
(S
, E
);
11071 Check_Dispatching_Operation
(S
, Empty
);
11074 Check_For_Primitive_Subprogram
11075 (Is_Primitive_Subp
, Is_Overriding
=> True);
11076 goto Check_Inequality
;
11079 -- Apparent redeclarations in instances can occur when two
11080 -- formal types get the same actual type. The subprograms in
11081 -- in the instance are legal, even if not callable from the
11082 -- outside. Calls from within are disambiguated elsewhere.
11083 -- For dispatching operations in the visible part, the usual
11084 -- rules apply, and operations with the same profile are not
11085 -- legal (B830001).
11087 elsif (In_Instance_Visible_Part
11088 and then not Is_Dispatching_Operation
(E
))
11089 or else In_Instance_Not_Visible
11093 -- Here we have a real error (identical profile)
11096 Error_Msg_Sloc
:= Sloc
(E
);
11098 -- Avoid cascaded errors if the entity appears in
11099 -- subsequent calls.
11101 Set_Scope
(S
, Current_Scope
);
11103 -- Generate error, with extra useful warning for the case
11104 -- of a generic instance with no completion.
11106 if Is_Generic_Instance
(S
)
11107 and then not Has_Completion
(E
)
11110 ("instantiation cannot provide body for&", S
);
11111 Error_Msg_N
("\& conflicts with declaration#", S
);
11113 Error_Msg_N
("& conflicts with declaration#", S
);
11120 -- If one subprogram has an access parameter and the other
11121 -- a parameter of an access type, calls to either might be
11122 -- ambiguous. Verify that parameters match except for the
11123 -- access parameter.
11125 if May_Hide_Profile
then
11131 F1
:= First_Formal
(S
);
11132 F2
:= First_Formal
(E
);
11133 while Present
(F1
) and then Present
(F2
) loop
11134 if Is_Access_Type
(Etype
(F1
)) then
11135 if not Is_Access_Type
(Etype
(F2
))
11136 or else not Conforming_Types
11137 (Designated_Type
(Etype
(F1
)),
11138 Designated_Type
(Etype
(F2
)),
11141 May_Hide_Profile
:= False;
11145 not Conforming_Types
11146 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
11148 May_Hide_Profile
:= False;
11155 if May_Hide_Profile
11159 Error_Msg_NE
("calls to& may be ambiguous??", S
, S
);
11168 -- On exit, we know that S is a new entity
11170 Enter_Overloaded_Entity
(S
);
11171 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
11172 Check_Overriding_Indicator
11173 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
11175 -- The Ghost policy in effect at the point of declaration of a parent
11176 -- subprogram and an overriding subprogram must match
11177 -- (SPARK RM 6.9(17)).
11179 Check_Ghost_Overriding
(S
, Overridden_Subp
);
11181 -- Overloading is not allowed in SPARK, except for operators
11183 if Nkind
(S
) /= N_Defining_Operator_Symbol
then
11184 Error_Msg_Sloc
:= Sloc
(Homonym
(S
));
11185 Check_SPARK_05_Restriction
11186 ("overloading not allowed with entity#", S
);
11189 -- If S is a derived operation for an untagged type then by
11190 -- definition it's not a dispatching operation (even if the parent
11191 -- operation was dispatching), so Check_Dispatching_Operation is not
11192 -- called in that case.
11194 if No
(Derived_Type
)
11195 or else Is_Tagged_Type
(Derived_Type
)
11197 Check_Dispatching_Operation
(S
, Empty
);
11201 -- If this is a user-defined equality operator that is not a derived
11202 -- subprogram, create the corresponding inequality. If the operation is
11203 -- dispatching, the expansion is done elsewhere, and we do not create
11204 -- an explicit inequality operation.
11206 <<Check_Inequality
>>
11207 if Chars
(S
) = Name_Op_Eq
11208 and then Etype
(S
) = Standard_Boolean
11209 and then Present
(Parent
(S
))
11210 and then not Is_Dispatching_Operation
(S
)
11212 Make_Inequality_Operator
(S
);
11213 Check_Untagged_Equality
(S
);
11215 end New_Overloaded_Entity
;
11217 ---------------------
11218 -- Process_Formals --
11219 ---------------------
11221 procedure Process_Formals
11223 Related_Nod
: Node_Id
)
11225 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean;
11226 -- Determine whether an access type designates a type coming from a
11229 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
11230 -- Check whether the default has a class-wide type. After analysis the
11231 -- default has the type of the formal, so we must also check explicitly
11232 -- for an access attribute.
11234 ----------------------------------
11235 -- Designates_From_Limited_With --
11236 ----------------------------------
11238 function Designates_From_Limited_With
(Typ
: Entity_Id
) return Boolean is
11239 Desig
: Entity_Id
:= Typ
;
11242 if Is_Access_Type
(Desig
) then
11243 Desig
:= Directly_Designated_Type
(Desig
);
11246 if Is_Class_Wide_Type
(Desig
) then
11247 Desig
:= Root_Type
(Desig
);
11251 Ekind
(Desig
) = E_Incomplete_Type
11252 and then From_Limited_With
(Desig
);
11253 end Designates_From_Limited_With
;
11255 ---------------------------
11256 -- Is_Class_Wide_Default --
11257 ---------------------------
11259 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
11261 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
11262 or else (Nkind
(D
) = N_Attribute_Reference
11263 and then Attribute_Name
(D
) = Name_Access
11264 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
11265 end Is_Class_Wide_Default
;
11269 Context
: constant Node_Id
:= Parent
(Parent
(T
));
11271 Formal
: Entity_Id
;
11272 Formal_Type
: Entity_Id
;
11273 Param_Spec
: Node_Id
;
11276 Num_Out_Params
: Nat
:= 0;
11277 First_Out_Param
: Entity_Id
:= Empty
;
11278 -- Used for setting Is_Only_Out_Parameter
11280 -- Start of processing for Process_Formals
11283 -- In order to prevent premature use of the formals in the same formal
11284 -- part, the Ekind is left undefined until all default expressions are
11285 -- analyzed. The Ekind is established in a separate loop at the end.
11287 Param_Spec
:= First
(T
);
11288 while Present
(Param_Spec
) loop
11289 Formal
:= Defining_Identifier
(Param_Spec
);
11290 Set_Never_Set_In_Source
(Formal
, True);
11291 Enter_Name
(Formal
);
11293 -- Case of ordinary parameters
11295 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
11296 Find_Type
(Parameter_Type
(Param_Spec
));
11297 Ptype
:= Parameter_Type
(Param_Spec
);
11299 if Ptype
= Error
then
11303 Formal_Type
:= Entity
(Ptype
);
11305 if Is_Incomplete_Type
(Formal_Type
)
11307 (Is_Class_Wide_Type
(Formal_Type
)
11308 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
11310 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
11311 -- primitive operations, as long as their completion is
11312 -- in the same declarative part. If in the private part
11313 -- this means that the type cannot be a Taft-amendment type.
11314 -- Check is done on package exit. For access to subprograms,
11315 -- the use is legal for Taft-amendment types.
11317 -- Ada 2012: tagged incomplete types are allowed as generic
11318 -- formal types. They do not introduce dependencies and the
11319 -- corresponding generic subprogram does not have a delayed
11320 -- freeze, because it does not need a freeze node. However,
11321 -- it is still the case that untagged incomplete types cannot
11322 -- be Taft-amendment types and must be completed in private
11323 -- part, so the subprogram must appear in the list of private
11324 -- dependents of the type.
11326 if Is_Tagged_Type
(Formal_Type
)
11327 or else (Ada_Version
>= Ada_2012
11328 and then not From_Limited_With
(Formal_Type
)
11329 and then not Is_Generic_Type
(Formal_Type
))
11331 if Ekind
(Scope
(Current_Scope
)) = E_Package
11332 and then not Is_Generic_Type
(Formal_Type
)
11333 and then not Is_Class_Wide_Type
(Formal_Type
)
11336 (Parent
(T
), N_Access_Function_Definition
,
11337 N_Access_Procedure_Definition
)
11339 Append_Elmt
(Current_Scope
,
11340 Private_Dependents
(Base_Type
(Formal_Type
)));
11342 -- Freezing is delayed to ensure that Register_Prim
11343 -- will get called for this operation, which is needed
11344 -- in cases where static dispatch tables aren't built.
11345 -- (Note that the same is done for controlling access
11346 -- parameter cases in function Access_Definition.)
11348 if not Is_Thunk
(Current_Scope
) then
11349 Set_Has_Delayed_Freeze
(Current_Scope
);
11354 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
11355 N_Access_Procedure_Definition
)
11357 -- AI05-0151: Tagged incomplete types are allowed in all
11358 -- formal parts. Untagged incomplete types are not allowed
11359 -- in bodies. Limited views of either kind are not allowed
11360 -- if there is no place at which the non-limited view can
11361 -- become available.
11363 -- Incomplete formal untagged types are not allowed in
11364 -- subprogram bodies (but are legal in their declarations).
11365 -- This excludes bodies created for null procedures, which
11366 -- are basic declarations.
11368 if Is_Generic_Type
(Formal_Type
)
11369 and then not Is_Tagged_Type
(Formal_Type
)
11370 and then Nkind
(Parent
(Related_Nod
)) = N_Subprogram_Body
11373 ("invalid use of formal incomplete type", Param_Spec
);
11375 elsif Ada_Version
>= Ada_2012
then
11376 if Is_Tagged_Type
(Formal_Type
)
11377 and then (not From_Limited_With
(Formal_Type
)
11378 or else not In_Package_Body
)
11382 elsif Nkind_In
(Context
, N_Accept_Statement
,
11383 N_Accept_Alternative
,
11385 or else (Nkind
(Context
) = N_Subprogram_Body
11386 and then Comes_From_Source
(Context
))
11389 ("invalid use of untagged incomplete type &",
11390 Ptype
, Formal_Type
);
11395 ("invalid use of incomplete type&",
11396 Param_Spec
, Formal_Type
);
11398 -- Further checks on the legality of incomplete types
11399 -- in formal parts are delayed until the freeze point
11400 -- of the enclosing subprogram or access to subprogram.
11404 elsif Ekind
(Formal_Type
) = E_Void
then
11406 ("premature use of&",
11407 Parameter_Type
(Param_Spec
), Formal_Type
);
11410 -- Ada 2012 (AI-142): Handle aliased parameters
11412 if Ada_Version
>= Ada_2012
11413 and then Aliased_Present
(Param_Spec
)
11415 Set_Is_Aliased
(Formal
);
11418 -- Ada 2005 (AI-231): Create and decorate an internal subtype
11419 -- declaration corresponding to the null-excluding type of the
11420 -- formal in the enclosing scope. Finally, replace the parameter
11421 -- type of the formal with the internal subtype.
11423 if Ada_Version
>= Ada_2005
11424 and then Null_Exclusion_Present
(Param_Spec
)
11426 if not Is_Access_Type
(Formal_Type
) then
11428 ("`NOT NULL` allowed only for an access type", Param_Spec
);
11431 if Can_Never_Be_Null
(Formal_Type
)
11432 and then Comes_From_Source
(Related_Nod
)
11435 ("`NOT NULL` not allowed (& already excludes null)",
11436 Param_Spec
, Formal_Type
);
11440 Create_Null_Excluding_Itype
11442 Related_Nod
=> Related_Nod
,
11443 Scope_Id
=> Scope
(Current_Scope
));
11445 -- If the designated type of the itype is an itype that is
11446 -- not frozen yet, we set the Has_Delayed_Freeze attribute
11447 -- on the access subtype, to prevent order-of-elaboration
11448 -- issues in the backend.
11451 -- type T is access procedure;
11452 -- procedure Op (O : not null T);
11454 if Is_Itype
(Directly_Designated_Type
(Formal_Type
))
11456 not Is_Frozen
(Directly_Designated_Type
(Formal_Type
))
11458 Set_Has_Delayed_Freeze
(Formal_Type
);
11463 -- An access formal type
11467 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
11469 -- No need to continue if we already notified errors
11471 if not Present
(Formal_Type
) then
11475 -- Ada 2005 (AI-254)
11478 AD
: constant Node_Id
:=
11479 Access_To_Subprogram_Definition
11480 (Parameter_Type
(Param_Spec
));
11482 if Present
(AD
) and then Protected_Present
(AD
) then
11484 Replace_Anonymous_Access_To_Protected_Subprogram
11490 Set_Etype
(Formal
, Formal_Type
);
11492 -- Deal with default expression if present
11494 Default
:= Expression
(Param_Spec
);
11496 if Present
(Default
) then
11497 Check_SPARK_05_Restriction
11498 ("default expression is not allowed", Default
);
11500 if Out_Present
(Param_Spec
) then
11502 ("default initialization only allowed for IN parameters",
11506 -- Do the special preanalysis of the expression (see section on
11507 -- "Handling of Default Expressions" in the spec of package Sem).
11509 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
11511 -- An access to constant cannot be the default for
11512 -- an access parameter that is an access to variable.
11514 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11515 and then not Is_Access_Constant
(Formal_Type
)
11516 and then Is_Access_Type
(Etype
(Default
))
11517 and then Is_Access_Constant
(Etype
(Default
))
11520 ("formal that is access to variable cannot be initialized "
11521 & "with an access-to-constant expression", Default
);
11524 -- Check that the designated type of an access parameter's default
11525 -- is not a class-wide type unless the parameter's designated type
11526 -- is also class-wide.
11528 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
11529 and then not Designates_From_Limited_With
(Formal_Type
)
11530 and then Is_Class_Wide_Default
(Default
)
11531 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
11534 ("access to class-wide expression not allowed here", Default
);
11537 -- Check incorrect use of dynamically tagged expressions
11539 if Is_Tagged_Type
(Formal_Type
) then
11540 Check_Dynamically_Tagged_Expression
11542 Typ
=> Formal_Type
,
11543 Related_Nod
=> Default
);
11547 -- Ada 2005 (AI-231): Static checks
11549 if Ada_Version
>= Ada_2005
11550 and then Is_Access_Type
(Etype
(Formal
))
11551 and then Can_Never_Be_Null
(Etype
(Formal
))
11553 Null_Exclusion_Static_Checks
(Param_Spec
);
11556 -- The following checks are relevant only when SPARK_Mode is on as
11557 -- these are not standard Ada legality rules.
11559 if SPARK_Mode
= On
then
11560 if Ekind_In
(Scope
(Formal
), E_Function
, E_Generic_Function
) then
11562 -- A function cannot have a parameter of mode IN OUT or OUT
11565 if Ekind_In
(Formal
, E_In_Out_Parameter
, E_Out_Parameter
) then
11567 ("function cannot have parameter of mode `OUT` or "
11568 & "`IN OUT`", Formal
);
11571 -- A procedure cannot have an effectively volatile formal
11572 -- parameter of mode IN because it behaves as a constant
11573 -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4)
11575 elsif Ekind
(Scope
(Formal
)) = E_Procedure
11576 and then Ekind
(Formal
) = E_In_Parameter
11577 and then Is_Effectively_Volatile
(Formal
)
11580 ("formal parameter of mode `IN` cannot be volatile", Formal
);
11588 -- If this is the formal part of a function specification, analyze the
11589 -- subtype mark in the context where the formals are visible but not
11590 -- yet usable, and may hide outer homographs.
11592 if Nkind
(Related_Nod
) = N_Function_Specification
then
11593 Analyze_Return_Type
(Related_Nod
);
11596 -- Now set the kind (mode) of each formal
11598 Param_Spec
:= First
(T
);
11599 while Present
(Param_Spec
) loop
11600 Formal
:= Defining_Identifier
(Param_Spec
);
11601 Set_Formal_Mode
(Formal
);
11603 if Ekind
(Formal
) = E_In_Parameter
then
11604 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
11606 if Present
(Expression
(Param_Spec
)) then
11607 Default
:= Expression
(Param_Spec
);
11609 if Is_Scalar_Type
(Etype
(Default
)) then
11610 if Nkind
(Parameter_Type
(Param_Spec
)) /=
11611 N_Access_Definition
11613 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
11617 (Related_Nod
, Parameter_Type
(Param_Spec
));
11620 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
11624 elsif Ekind
(Formal
) = E_Out_Parameter
then
11625 Num_Out_Params
:= Num_Out_Params
+ 1;
11627 if Num_Out_Params
= 1 then
11628 First_Out_Param
:= Formal
;
11631 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
11632 Num_Out_Params
:= Num_Out_Params
+ 1;
11635 -- Skip remaining processing if formal type was in error
11637 if Etype
(Formal
) = Any_Type
or else Error_Posted
(Formal
) then
11638 goto Next_Parameter
;
11641 -- Force call by reference if aliased
11644 Conv
: constant Convention_Id
:= Convention
(Etype
(Formal
));
11646 if Is_Aliased
(Formal
) then
11647 Set_Mechanism
(Formal
, By_Reference
);
11649 -- Warn if user asked this to be passed by copy
11651 if Conv
= Convention_Ada_Pass_By_Copy
then
11653 ("cannot pass aliased parameter & by copy??", Formal
);
11656 -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy
11658 elsif Conv
= Convention_Ada_Pass_By_Copy
then
11659 Set_Mechanism
(Formal
, By_Copy
);
11661 elsif Conv
= Convention_Ada_Pass_By_Reference
then
11662 Set_Mechanism
(Formal
, By_Reference
);
11670 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
11671 Set_Is_Only_Out_Parameter
(First_Out_Param
);
11673 end Process_Formals
;
11675 ----------------------------
11676 -- Reference_Body_Formals --
11677 ----------------------------
11679 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
11684 if Error_Posted
(Spec
) then
11688 -- Iterate over both lists. They may be of different lengths if the two
11689 -- specs are not conformant.
11691 Fs
:= First_Formal
(Spec
);
11692 Fb
:= First_Formal
(Bod
);
11693 while Present
(Fs
) and then Present
(Fb
) loop
11694 Generate_Reference
(Fs
, Fb
, 'b');
11696 if Style_Check
then
11697 Style
.Check_Identifier
(Fb
, Fs
);
11700 Set_Spec_Entity
(Fb
, Fs
);
11701 Set_Referenced
(Fs
, False);
11705 end Reference_Body_Formals
;
11707 -------------------------
11708 -- Set_Actual_Subtypes --
11709 -------------------------
11711 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
11713 Formal
: Entity_Id
;
11715 First_Stmt
: Node_Id
:= Empty
;
11716 AS_Needed
: Boolean;
11719 -- If this is an empty initialization procedure, no need to create
11720 -- actual subtypes (small optimization).
11722 if Ekind
(Subp
) = E_Procedure
and then Is_Null_Init_Proc
(Subp
) then
11725 -- Within a predicate function we do not want to generate local
11726 -- subtypes that may generate nested predicate functions.
11728 elsif Is_Subprogram
(Subp
) and then Is_Predicate_Function
(Subp
) then
11732 -- The subtype declarations may freeze the formals. The body generated
11733 -- for an expression function is not a freeze point, so do not emit
11734 -- these declarations (small loss of efficiency in rare cases).
11736 if Nkind
(N
) = N_Subprogram_Body
11737 and then Was_Expression_Function
(N
)
11742 Formal
:= First_Formal
(Subp
);
11743 while Present
(Formal
) loop
11744 T
:= Etype
(Formal
);
11746 -- We never need an actual subtype for a constrained formal
11748 if Is_Constrained
(T
) then
11749 AS_Needed
:= False;
11751 -- If we have unknown discriminants, then we do not need an actual
11752 -- subtype, or more accurately we cannot figure it out. Note that
11753 -- all class-wide types have unknown discriminants.
11755 elsif Has_Unknown_Discriminants
(T
) then
11756 AS_Needed
:= False;
11758 -- At this stage we have an unconstrained type that may need an
11759 -- actual subtype. For sure the actual subtype is needed if we have
11760 -- an unconstrained array type. However, in an instance, the type
11761 -- may appear as a subtype of the full view, while the actual is
11762 -- in fact private (in which case no actual subtype is needed) so
11763 -- check the kind of the base type.
11765 elsif Is_Array_Type
(Base_Type
(T
)) then
11768 -- The only other case needing an actual subtype is an unconstrained
11769 -- record type which is an IN parameter (we cannot generate actual
11770 -- subtypes for the OUT or IN OUT case, since an assignment can
11771 -- change the discriminant values. However we exclude the case of
11772 -- initialization procedures, since discriminants are handled very
11773 -- specially in this context, see the section entitled "Handling of
11774 -- Discriminants" in Einfo.
11776 -- We also exclude the case of Discrim_SO_Functions (functions used
11777 -- in front-end layout mode for size/offset values), since in such
11778 -- functions only discriminants are referenced, and not only are such
11779 -- subtypes not needed, but they cannot always be generated, because
11780 -- of order of elaboration issues.
11782 elsif Is_Record_Type
(T
)
11783 and then Ekind
(Formal
) = E_In_Parameter
11784 and then Chars
(Formal
) /= Name_uInit
11785 and then not Is_Unchecked_Union
(T
)
11786 and then not Is_Discrim_SO_Function
(Subp
)
11790 -- All other cases do not need an actual subtype
11793 AS_Needed
:= False;
11796 -- Generate actual subtypes for unconstrained arrays and
11797 -- unconstrained discriminated records.
11800 if Nkind
(N
) = N_Accept_Statement
then
11802 -- If expansion is active, the formal is replaced by a local
11803 -- variable that renames the corresponding entry of the
11804 -- parameter block, and it is this local variable that may
11805 -- require an actual subtype.
11807 if Expander_Active
then
11808 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
11810 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11813 if Present
(Handled_Statement_Sequence
(N
)) then
11815 First
(Statements
(Handled_Statement_Sequence
(N
)));
11816 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
11817 Mark_Rewrite_Insertion
(Decl
);
11819 -- If the accept statement has no body, there will be no
11820 -- reference to the actuals, so no need to compute actual
11827 Decl
:= Build_Actual_Subtype
(T
, Formal
);
11828 Prepend
(Decl
, Declarations
(N
));
11829 Mark_Rewrite_Insertion
(Decl
);
11832 -- The declaration uses the bounds of an existing object, and
11833 -- therefore needs no constraint checks.
11835 Analyze
(Decl
, Suppress
=> All_Checks
);
11836 Set_Is_Actual_Subtype
(Defining_Identifier
(Decl
));
11838 -- We need to freeze manually the generated type when it is
11839 -- inserted anywhere else than in a declarative part.
11841 if Present
(First_Stmt
) then
11842 Insert_List_Before_And_Analyze
(First_Stmt
,
11843 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11845 -- Ditto if the type has a dynamic predicate, because the
11846 -- generated function will mention the actual subtype. The
11847 -- predicate may come from an explicit aspect of be inherited.
11849 elsif Has_Predicates
(T
) then
11850 Insert_List_Before_And_Analyze
(Decl
,
11851 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
11854 if Nkind
(N
) = N_Accept_Statement
11855 and then Expander_Active
11857 Set_Actual_Subtype
(Renamed_Object
(Formal
),
11858 Defining_Identifier
(Decl
));
11860 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
11864 Next_Formal
(Formal
);
11866 end Set_Actual_Subtypes
;
11868 ---------------------
11869 -- Set_Formal_Mode --
11870 ---------------------
11872 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
11873 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
11874 Id
: constant Entity_Id
:= Scope
(Formal_Id
);
11877 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
11878 -- since we ensure that corresponding actuals are always valid at the
11879 -- point of the call.
11881 if Out_Present
(Spec
) then
11882 if Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
11883 or else Is_Subprogram_Or_Generic_Subprogram
(Id
)
11885 Set_Has_Out_Or_In_Out_Parameter
(Id
, True);
11888 if Ekind_In
(Id
, E_Function
, E_Generic_Function
) then
11890 -- [IN] OUT parameters allowed for functions in Ada 2012
11892 if Ada_Version
>= Ada_2012
then
11894 -- Even in Ada 2012 operators can only have IN parameters
11896 if Is_Operator_Symbol_Name
(Chars
(Scope
(Formal_Id
))) then
11897 Error_Msg_N
("operators can only have IN parameters", Spec
);
11900 if In_Present
(Spec
) then
11901 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11903 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11906 -- But not in earlier versions of Ada
11909 Error_Msg_N
("functions can only have IN parameters", Spec
);
11910 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11913 elsif In_Present
(Spec
) then
11914 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
11917 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
11918 Set_Never_Set_In_Source
(Formal_Id
, True);
11919 Set_Is_True_Constant
(Formal_Id
, False);
11920 Set_Current_Value
(Formal_Id
, Empty
);
11924 Set_Ekind
(Formal_Id
, E_In_Parameter
);
11927 -- Set Is_Known_Non_Null for access parameters since the language
11928 -- guarantees that access parameters are always non-null. We also set
11929 -- Can_Never_Be_Null, since there is no way to change the value.
11931 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
11933 -- Ada 2005 (AI-231): In Ada 95, access parameters are always non-
11934 -- null; In Ada 2005, only if then null_exclusion is explicit.
11936 if Ada_Version
< Ada_2005
11937 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
11939 Set_Is_Known_Non_Null
(Formal_Id
);
11940 Set_Can_Never_Be_Null
(Formal_Id
);
11943 -- Ada 2005 (AI-231): Null-exclusion access subtype
11945 elsif Is_Access_Type
(Etype
(Formal_Id
))
11946 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
11948 Set_Is_Known_Non_Null
(Formal_Id
);
11950 -- We can also set Can_Never_Be_Null (thus preventing some junk
11951 -- access checks) for the case of an IN parameter, which cannot
11952 -- be changed, or for an IN OUT parameter, which can be changed but
11953 -- not to a null value. But for an OUT parameter, the initial value
11954 -- passed in can be null, so we can't set this flag in that case.
11956 if Ekind
(Formal_Id
) /= E_Out_Parameter
then
11957 Set_Can_Never_Be_Null
(Formal_Id
);
11961 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
11962 Set_Formal_Validity
(Formal_Id
);
11963 end Set_Formal_Mode
;
11965 -------------------------
11966 -- Set_Formal_Validity --
11967 -------------------------
11969 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
11971 -- If no validity checking, then we cannot assume anything about the
11972 -- validity of parameters, since we do not know there is any checking
11973 -- of the validity on the call side.
11975 if not Validity_Checks_On
then
11978 -- If validity checking for parameters is enabled, this means we are
11979 -- not supposed to make any assumptions about argument values.
11981 elsif Validity_Check_Parameters
then
11984 -- If we are checking in parameters, we will assume that the caller is
11985 -- also checking parameters, so we can assume the parameter is valid.
11987 elsif Ekind
(Formal_Id
) = E_In_Parameter
11988 and then Validity_Check_In_Params
11990 Set_Is_Known_Valid
(Formal_Id
, True);
11992 -- Similar treatment for IN OUT parameters
11994 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
11995 and then Validity_Check_In_Out_Params
11997 Set_Is_Known_Valid
(Formal_Id
, True);
11999 end Set_Formal_Validity
;
12001 ------------------------
12002 -- Subtype_Conformant --
12003 ------------------------
12005 function Subtype_Conformant
12006 (New_Id
: Entity_Id
;
12007 Old_Id
: Entity_Id
;
12008 Skip_Controlling_Formals
: Boolean := False) return Boolean
12012 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
12013 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12015 end Subtype_Conformant
;
12017 ---------------------
12018 -- Type_Conformant --
12019 ---------------------
12021 function Type_Conformant
12022 (New_Id
: Entity_Id
;
12023 Old_Id
: Entity_Id
;
12024 Skip_Controlling_Formals
: Boolean := False) return Boolean
12028 May_Hide_Profile
:= False;
12030 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
12031 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
12033 end Type_Conformant
;
12035 -------------------------------
12036 -- Valid_Operator_Definition --
12037 -------------------------------
12039 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
12042 Id
: constant Name_Id
:= Chars
(Designator
);
12046 F
:= First_Formal
(Designator
);
12047 while Present
(F
) loop
12050 if Present
(Default_Value
(F
)) then
12052 ("default values not allowed for operator parameters",
12055 -- For function instantiations that are operators, we must check
12056 -- separately that the corresponding generic only has in-parameters.
12057 -- For subprogram declarations this is done in Set_Formal_Mode. Such
12058 -- an error could not arise in earlier versions of the language.
12060 elsif Ekind
(F
) /= E_In_Parameter
then
12061 Error_Msg_N
("operators can only have IN parameters", F
);
12067 -- Verify that user-defined operators have proper number of arguments
12068 -- First case of operators which can only be unary
12070 if Nam_In
(Id
, Name_Op_Not
, Name_Op_Abs
) then
12073 -- Case of operators which can be unary or binary
12075 elsif Nam_In
(Id
, Name_Op_Add
, Name_Op_Subtract
) then
12076 N_OK
:= (N
in 1 .. 2);
12078 -- All other operators can only be binary
12086 ("incorrect number of arguments for operator", Designator
);
12090 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
12091 and then not Is_Intrinsic_Subprogram
(Designator
)
12094 ("explicit definition of inequality not allowed", Designator
);
12096 end Valid_Operator_Definition
;