1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Debug
; use Debug
;
30 with Einfo
; use Einfo
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
33 with Expander
; use Expander
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Tss
; use Exp_Tss
;
39 with Exp_Util
; use Exp_Util
;
40 with Fname
; use Fname
;
41 with Freeze
; use Freeze
;
42 with Itypes
; use Itypes
;
43 with Lib
.Xref
; use Lib
.Xref
;
44 with Layout
; use Layout
;
45 with Namet
; use Namet
;
47 with Nlists
; use Nlists
;
48 with Nmake
; use Nmake
;
50 with Output
; use Output
;
51 with Restrict
; use Restrict
;
52 with Rident
; use Rident
;
53 with Rtsfind
; use Rtsfind
;
55 with Sem_Aux
; use Sem_Aux
;
56 with Sem_Cat
; use Sem_Cat
;
57 with Sem_Ch3
; use Sem_Ch3
;
58 with Sem_Ch4
; use Sem_Ch4
;
59 with Sem_Ch5
; use Sem_Ch5
;
60 with Sem_Ch8
; use Sem_Ch8
;
61 with Sem_Ch10
; use Sem_Ch10
;
62 with Sem_Ch12
; use Sem_Ch12
;
63 with Sem_Ch13
; use Sem_Ch13
;
64 with Sem_Disp
; use Sem_Disp
;
65 with Sem_Dist
; use Sem_Dist
;
66 with Sem_Elim
; use Sem_Elim
;
67 with Sem_Eval
; use Sem_Eval
;
68 with Sem_Mech
; use Sem_Mech
;
69 with Sem_Prag
; use Sem_Prag
;
70 with Sem_Res
; use Sem_Res
;
71 with Sem_Util
; use Sem_Util
;
72 with Sem_Type
; use Sem_Type
;
73 with Sem_Warn
; use Sem_Warn
;
74 with Sinput
; use Sinput
;
75 with Stand
; use Stand
;
76 with Sinfo
; use Sinfo
;
77 with Sinfo
.CN
; use Sinfo
.CN
;
78 with Snames
; use Snames
;
79 with Stringt
; use Stringt
;
81 with Stylesw
; use Stylesw
;
82 with Tbuild
; use Tbuild
;
83 with Uintp
; use Uintp
;
84 with Urealp
; use Urealp
;
85 with Validsw
; use Validsw
;
87 package body Sem_Ch6
is
89 May_Hide_Profile
: Boolean := False;
90 -- This flag is used to indicate that two formals in two subprograms being
91 -- checked for conformance differ only in that one is an access parameter
92 -- while the other is of a general access type with the same designated
93 -- type. In this case, if the rest of the signatures match, a call to
94 -- either subprogram may be ambiguous, which is worth a warning. The flag
95 -- is set in Compatible_Types, and the warning emitted in
96 -- New_Overloaded_Entity.
98 -----------------------
99 -- Local Subprograms --
100 -----------------------
102 procedure Analyze_Return_Statement
(N
: Node_Id
);
103 -- Common processing for simple and extended return statements
105 procedure Analyze_Function_Return
(N
: Node_Id
);
106 -- Subsidiary to Analyze_Return_Statement. Called when the return statement
107 -- applies to a [generic] function.
109 procedure Analyze_Return_Type
(N
: Node_Id
);
110 -- Subsidiary to Process_Formals: analyze subtype mark in function
111 -- specification in a context where the formals are visible and hide
114 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
);
115 -- Does all the real work of Analyze_Subprogram_Body. This is split out so
116 -- that we can use RETURN but not skip the debug output at the end.
118 procedure Analyze_Generic_Subprogram_Body
(N
: Node_Id
; Gen_Id
: Entity_Id
);
119 -- Analyze a generic subprogram body. N is the body to be analyzed, and
120 -- Gen_Id is the defining entity Id for the corresponding spec.
122 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
);
123 -- If a subprogram has pragma Inline and inlining is active, use generic
124 -- machinery to build an unexpanded body for the subprogram. This body is
125 -- subsequently used for inline expansions at call sites. If subprogram can
126 -- be inlined (depending on size and nature of local declarations) this
127 -- function returns true. Otherwise subprogram body is treated normally.
128 -- If proper warnings are enabled and the subprogram contains a construct
129 -- that cannot be inlined, the offending construct is flagged accordingly.
131 procedure Check_Conformance
134 Ctype
: Conformance_Type
;
136 Conforms
: out Boolean;
137 Err_Loc
: Node_Id
:= Empty
;
138 Get_Inst
: Boolean := False;
139 Skip_Controlling_Formals
: Boolean := False);
140 -- Given two entities, this procedure checks that the profiles associated
141 -- with these entities meet the conformance criterion given by the third
142 -- parameter. If they conform, Conforms is set True and control returns
143 -- to the caller. If they do not conform, Conforms is set to False, and
144 -- in addition, if Errmsg is True on the call, proper messages are output
145 -- to complain about the conformance failure. If Err_Loc is non_Empty
146 -- the error messages are placed on Err_Loc, if Err_Loc is empty, then
147 -- error messages are placed on the appropriate part of the construct
148 -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance
149 -- against a formal access-to-subprogram type so Get_Instance_Of must
152 procedure Check_Subprogram_Order
(N
: Node_Id
);
153 -- N is the N_Subprogram_Body node for a subprogram. This routine applies
154 -- the alpha ordering rule for N if this ordering requirement applicable.
156 procedure Check_Returns
160 Proc
: Entity_Id
:= Empty
);
161 -- Called to check for missing return statements in a function body, or for
162 -- returns present in a procedure body which has No_Return set. HSS is the
163 -- handled statement sequence for the subprogram body. This procedure
164 -- checks all flow paths to make sure they either have return (Mode = 'F',
165 -- used for functions) or do not have a return (Mode = 'P', used for
166 -- No_Return procedures). The flag Err is set if there are any control
167 -- paths not explicitly terminated by a return in the function case, and is
168 -- True otherwise. Proc is the entity for the procedure case and is used
169 -- in posting the warning message.
171 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
);
172 -- In Ada 2012, a primitive equality operator on an untagged record type
173 -- must appear before the type is frozen, and have the same visibility as
174 -- that of the type. This procedure checks that this rule is met, and
175 -- otherwise emits an error on the subprogram declaration and a warning
176 -- on the earlier freeze point if it is easy to locate.
178 procedure Enter_Overloaded_Entity
(S
: Entity_Id
);
179 -- This procedure makes S, a new overloaded entity, into the first visible
180 -- entity with that name.
182 procedure Install_Entity
(E
: Entity_Id
);
183 -- Make single entity visible (used for generic formals as well)
185 function Is_Non_Overriding_Operation
187 New_E
: Entity_Id
) return Boolean;
188 -- Enforce the rule given in 12.3(18): a private operation in an instance
189 -- overrides an inherited operation only if the corresponding operation
190 -- was overriding in the generic. This can happen for primitive operations
191 -- of types derived (in the generic unit) from formal private or formal
194 procedure Make_Inequality_Operator
(S
: Entity_Id
);
195 -- Create the declaration for an inequality operator that is implicitly
196 -- created by a user-defined equality operator that yields a boolean.
198 procedure May_Need_Actuals
(Fun
: Entity_Id
);
199 -- Flag functions that can be called without parameters, i.e. those that
200 -- have no parameters, or those for which defaults exist for all parameters
202 procedure Process_PPCs
205 Body_Id
: Entity_Id
);
206 -- Called from Analyze[_Generic]_Subprogram_Body to deal with scanning post
207 -- conditions for the body and assembling and inserting the _postconditions
208 -- procedure. N is the node for the subprogram body and Body_Id/Spec_Id are
209 -- the entities for the body and separate spec (if there is no separate
210 -- spec, Spec_Id is Empty). Note that invariants and predicates may also
211 -- provide postconditions, and are also handled in this procedure.
213 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
);
214 -- Formal_Id is an formal parameter entity. This procedure deals with
215 -- setting the proper validity status for this entity, which depends on
216 -- the kind of parameter and the validity checking mode.
218 ------------------------------
219 -- Analyze_Return_Statement --
220 ------------------------------
222 procedure Analyze_Return_Statement
(N
: Node_Id
) is
224 pragma Assert
(Nkind_In
(N
, N_Simple_Return_Statement
,
225 N_Extended_Return_Statement
));
227 Returns_Object
: constant Boolean :=
228 Nkind
(N
) = N_Extended_Return_Statement
230 (Nkind
(N
) = N_Simple_Return_Statement
231 and then Present
(Expression
(N
)));
232 -- True if we're returning something; that is, "return <expression>;"
233 -- or "return Result : T [:= ...]". False for "return;". Used for error
234 -- checking: If Returns_Object is True, N should apply to a function
235 -- body; otherwise N should apply to a procedure body, entry body,
236 -- accept statement, or extended return statement.
238 function Find_What_It_Applies_To
return Entity_Id
;
239 -- Find the entity representing the innermost enclosing body, accept
240 -- statement, or extended return statement. If the result is a callable
241 -- construct or extended return statement, then this will be the value
242 -- of the Return_Applies_To attribute. Otherwise, the program is
243 -- illegal. See RM-6.5(4/2).
245 -----------------------------
246 -- Find_What_It_Applies_To --
247 -----------------------------
249 function Find_What_It_Applies_To
return Entity_Id
is
250 Result
: Entity_Id
:= Empty
;
253 -- Loop outward through the Scope_Stack, skipping blocks and loops
255 for J
in reverse 0 .. Scope_Stack
.Last
loop
256 Result
:= Scope_Stack
.Table
(J
).Entity
;
257 exit when Ekind
(Result
) /= E_Block
and then
258 Ekind
(Result
) /= E_Loop
;
261 pragma Assert
(Present
(Result
));
263 end Find_What_It_Applies_To
;
265 -- Local declarations
267 Scope_Id
: constant Entity_Id
:= Find_What_It_Applies_To
;
268 Kind
: constant Entity_Kind
:= Ekind
(Scope_Id
);
269 Loc
: constant Source_Ptr
:= Sloc
(N
);
270 Stm_Entity
: constant Entity_Id
:=
272 (E_Return_Statement
, Current_Scope
, Loc
, 'R');
274 -- Start of processing for Analyze_Return_Statement
277 Set_Return_Statement_Entity
(N
, Stm_Entity
);
279 Set_Etype
(Stm_Entity
, Standard_Void_Type
);
280 Set_Return_Applies_To
(Stm_Entity
, Scope_Id
);
282 -- Place Return entity on scope stack, to simplify enforcement of 6.5
283 -- (4/2): an inner return statement will apply to this extended return.
285 if Nkind
(N
) = N_Extended_Return_Statement
then
286 Push_Scope
(Stm_Entity
);
289 -- Check that pragma No_Return is obeyed. Don't complain about the
290 -- implicitly-generated return that is placed at the end.
292 if No_Return
(Scope_Id
) and then Comes_From_Source
(N
) then
293 Error_Msg_N
("RETURN statement not allowed (No_Return)", N
);
296 -- Warn on any unassigned OUT parameters if in procedure
298 if Ekind
(Scope_Id
) = E_Procedure
then
299 Warn_On_Unassigned_Out_Parameter
(N
, Scope_Id
);
302 -- Check that functions return objects, and other things do not
304 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
305 if not Returns_Object
then
306 Error_Msg_N
("missing expression in return from function", N
);
309 elsif Kind
= E_Procedure
or else Kind
= E_Generic_Procedure
then
310 if Returns_Object
then
311 Error_Msg_N
("procedure cannot return value (use function)", N
);
314 elsif Kind
= E_Entry
or else Kind
= E_Entry_Family
then
315 if Returns_Object
then
316 if Is_Protected_Type
(Scope
(Scope_Id
)) then
317 Error_Msg_N
("entry body cannot return value", N
);
319 Error_Msg_N
("accept statement cannot return value", N
);
323 elsif Kind
= E_Return_Statement
then
325 -- We are nested within another return statement, which must be an
326 -- extended_return_statement.
328 if Returns_Object
then
330 ("extended_return_statement cannot return value; " &
331 "use `""RETURN;""`", N
);
335 Error_Msg_N
("illegal context for return statement", N
);
338 if Kind
= E_Function
or else Kind
= E_Generic_Function
then
339 Analyze_Function_Return
(N
);
342 if Nkind
(N
) = N_Extended_Return_Statement
then
346 Kill_Current_Values
(Last_Assignment_Only
=> True);
347 Check_Unreachable_Code
(N
);
348 end Analyze_Return_Statement
;
350 ---------------------------------------------
351 -- Analyze_Abstract_Subprogram_Declaration --
352 ---------------------------------------------
354 procedure Analyze_Abstract_Subprogram_Declaration
(N
: Node_Id
) is
355 Designator
: constant Entity_Id
:=
356 Analyze_Subprogram_Specification
(Specification
(N
));
357 Scop
: constant Entity_Id
:= Current_Scope
;
360 Generate_Definition
(Designator
);
361 Set_Is_Abstract_Subprogram
(Designator
);
362 New_Overloaded_Entity
(Designator
);
363 Check_Delayed_Subprogram
(Designator
);
365 Set_Categorization_From_Scope
(Designator
, Scop
);
367 if Ekind
(Scope
(Designator
)) = E_Protected_Type
then
369 ("abstract subprogram not allowed in protected type", N
);
371 -- Issue a warning if the abstract subprogram is neither a dispatching
372 -- operation nor an operation that overrides an inherited subprogram or
373 -- predefined operator, since this most likely indicates a mistake.
375 elsif Warn_On_Redundant_Constructs
376 and then not Is_Dispatching_Operation
(Designator
)
377 and then not Present
(Overridden_Operation
(Designator
))
378 and then (not Is_Operator_Symbol_Name
(Chars
(Designator
))
379 or else Scop
/= Scope
(Etype
(First_Formal
(Designator
))))
382 ("?abstract subprogram is not dispatching or overriding", N
);
385 Generate_Reference_To_Formals
(Designator
);
386 Check_Eliminated
(Designator
);
387 Analyze_Aspect_Specifications
(N
, Designator
, Aspect_Specifications
(N
));
388 end Analyze_Abstract_Subprogram_Declaration
;
390 ----------------------------------------
391 -- Analyze_Extended_Return_Statement --
392 ----------------------------------------
394 procedure Analyze_Extended_Return_Statement
(N
: Node_Id
) is
396 Analyze_Return_Statement
(N
);
397 end Analyze_Extended_Return_Statement
;
399 ----------------------------
400 -- Analyze_Function_Call --
401 ----------------------------
403 procedure Analyze_Function_Call
(N
: Node_Id
) is
404 P
: constant Node_Id
:= Name
(N
);
405 L
: constant List_Id
:= Parameter_Associations
(N
);
411 -- A call of the form A.B (X) may be an Ada05 call, which is rewritten
412 -- as B (A, X). If the rewriting is successful, the call has been
413 -- analyzed and we just return.
415 if Nkind
(P
) = N_Selected_Component
416 and then Name
(N
) /= P
417 and then Is_Rewrite_Substitution
(N
)
418 and then Present
(Etype
(N
))
423 -- If error analyzing name, then set Any_Type as result type and return
425 if Etype
(P
) = Any_Type
then
426 Set_Etype
(N
, Any_Type
);
430 -- Otherwise analyze the parameters
434 while Present
(Actual
) loop
436 Check_Parameterless_Call
(Actual
);
442 end Analyze_Function_Call
;
444 -----------------------------
445 -- Analyze_Function_Return --
446 -----------------------------
448 procedure Analyze_Function_Return
(N
: Node_Id
) is
449 Loc
: constant Source_Ptr
:= Sloc
(N
);
450 Stm_Entity
: constant Entity_Id
:= Return_Statement_Entity
(N
);
451 Scope_Id
: constant Entity_Id
:= Return_Applies_To
(Stm_Entity
);
453 R_Type
: constant Entity_Id
:= Etype
(Scope_Id
);
454 -- Function result subtype
456 procedure Check_Limited_Return
(Expr
: Node_Id
);
457 -- Check the appropriate (Ada 95 or Ada 2005) rules for returning
458 -- limited types. Used only for simple return statements.
459 -- Expr is the expression returned.
461 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
);
462 -- Check that the return_subtype_indication properly matches the result
463 -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2).
465 --------------------------
466 -- Check_Limited_Return --
467 --------------------------
469 procedure Check_Limited_Return
(Expr
: Node_Id
) is
471 -- Ada 2005 (AI-318-02): Return-by-reference types have been
472 -- removed and replaced by anonymous access results. This is an
473 -- incompatibility with Ada 95. Not clear whether this should be
474 -- enforced yet or perhaps controllable with special switch. ???
476 if Is_Limited_Type
(R_Type
)
477 and then Comes_From_Source
(N
)
478 and then not In_Instance_Body
479 and then not OK_For_Limited_Init_In_05
(R_Type
, Expr
)
483 if Ada_Version
>= Ada_2005
484 and then not Debug_Flag_Dot_L
485 and then not GNAT_Mode
488 ("(Ada 2005) cannot copy object of a limited type " &
489 "(RM-2005 6.5(5.5/2))", Expr
);
491 if Is_Immutably_Limited_Type
(R_Type
) then
493 ("\return by reference not permitted in Ada 2005", Expr
);
496 -- Warn in Ada 95 mode, to give folks a heads up about this
499 -- In GNAT mode, this is just a warning, to allow it to be
500 -- evilly turned off. Otherwise it is a real error.
502 -- In a generic context, simplify the warning because it makes
503 -- no sense to discuss pass-by-reference or copy.
505 elsif Warn_On_Ada_2005_Compatibility
or GNAT_Mode
then
506 if Inside_A_Generic
then
508 ("return of limited object not permitted in Ada2005 "
509 & "(RM-2005 6.5(5.5/2))?", Expr
);
511 elsif Is_Immutably_Limited_Type
(R_Type
) then
513 ("return by reference not permitted in Ada 2005 "
514 & "(RM-2005 6.5(5.5/2))?", Expr
);
517 ("cannot copy object of a limited type in Ada 2005 "
518 & "(RM-2005 6.5(5.5/2))?", Expr
);
521 -- Ada 95 mode, compatibility warnings disabled
524 return; -- skip continuation messages below
527 if not Inside_A_Generic
then
529 ("\consider switching to return of access type", Expr
);
530 Explain_Limited_Type
(R_Type
, Expr
);
533 end Check_Limited_Return
;
535 -------------------------------------
536 -- Check_Return_Subtype_Indication --
537 -------------------------------------
539 procedure Check_Return_Subtype_Indication
(Obj_Decl
: Node_Id
) is
540 Return_Obj
: constant Node_Id
:= Defining_Identifier
(Obj_Decl
);
542 R_Stm_Type
: constant Entity_Id
:= Etype
(Return_Obj
);
543 -- Subtype given in the extended return statement (must match R_Type)
545 Subtype_Ind
: constant Node_Id
:=
546 Object_Definition
(Original_Node
(Obj_Decl
));
548 R_Type_Is_Anon_Access
:
550 Ekind
(R_Type
) = E_Anonymous_Access_Subprogram_Type
552 Ekind
(R_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
554 Ekind
(R_Type
) = E_Anonymous_Access_Type
;
555 -- True if return type of the function is an anonymous access type
556 -- Can't we make Is_Anonymous_Access_Type in einfo ???
558 R_Stm_Type_Is_Anon_Access
:
560 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Subprogram_Type
562 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Protected_Subprogram_Type
564 Ekind
(R_Stm_Type
) = E_Anonymous_Access_Type
;
565 -- True if type of the return object is an anonymous access type
568 -- First, avoid cascaded errors
570 if Error_Posted
(Obj_Decl
) or else Error_Posted
(Subtype_Ind
) then
574 -- "return access T" case; check that the return statement also has
575 -- "access T", and that the subtypes statically match:
576 -- if this is an access to subprogram the signatures must match.
578 if R_Type_Is_Anon_Access
then
579 if R_Stm_Type_Is_Anon_Access
then
581 Ekind
(Designated_Type
(R_Stm_Type
)) /= E_Subprogram_Type
583 if Base_Type
(Designated_Type
(R_Stm_Type
)) /=
584 Base_Type
(Designated_Type
(R_Type
))
585 or else not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
)
588 ("subtype must statically match function result subtype",
589 Subtype_Mark
(Subtype_Ind
));
593 -- For two anonymous access to subprogram types, the
594 -- types themselves must be type conformant.
596 if not Conforming_Types
597 (R_Stm_Type
, R_Type
, Fully_Conformant
)
600 ("subtype must statically match function result subtype",
606 Error_Msg_N
("must use anonymous access type", Subtype_Ind
);
609 -- Subtype indication case: check that the return object's type is
610 -- covered by the result type, and that the subtypes statically match
611 -- when the result subtype is constrained. Also handle record types
612 -- with unknown discriminants for which we have built the underlying
613 -- record view. Coverage is needed to allow specific-type return
614 -- objects when the result type is class-wide (see AI05-32).
616 elsif Covers
(Base_Type
(R_Type
), Base_Type
(R_Stm_Type
))
617 or else (Is_Underlying_Record_View
(Base_Type
(R_Stm_Type
))
621 Underlying_Record_View
(Base_Type
(R_Stm_Type
))))
623 -- A null exclusion may be present on the return type, on the
624 -- function specification, on the object declaration or on the
627 if Is_Access_Type
(R_Type
)
629 (Can_Never_Be_Null
(R_Type
)
630 or else Null_Exclusion_Present
(Parent
(Scope_Id
))) /=
631 Can_Never_Be_Null
(R_Stm_Type
)
634 ("subtype must statically match function result subtype",
638 -- AI05-103: for elementary types, subtypes must statically match
640 if Is_Constrained
(R_Type
)
641 or else Is_Access_Type
(R_Type
)
643 if not Subtypes_Statically_Match
(R_Stm_Type
, R_Type
) then
645 ("subtype must statically match function result subtype",
650 elsif Etype
(Base_Type
(R_Type
)) = R_Stm_Type
651 and then Is_Null_Extension
(Base_Type
(R_Type
))
657 ("wrong type for return_subtype_indication", Subtype_Ind
);
659 end Check_Return_Subtype_Indication
;
661 ---------------------
662 -- Local Variables --
663 ---------------------
667 -- Start of processing for Analyze_Function_Return
670 Set_Return_Present
(Scope_Id
);
672 if Nkind
(N
) = N_Simple_Return_Statement
then
673 Expr
:= Expression
(N
);
674 Analyze_And_Resolve
(Expr
, R_Type
);
675 Check_Limited_Return
(Expr
);
678 -- Analyze parts specific to extended_return_statement:
681 Obj_Decl
: constant Node_Id
:=
682 Last
(Return_Object_Declarations
(N
));
684 HSS
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
687 Expr
:= Expression
(Obj_Decl
);
689 -- Note: The check for OK_For_Limited_Init will happen in
690 -- Analyze_Object_Declaration; we treat it as a normal
691 -- object declaration.
693 Set_Is_Return_Object
(Defining_Identifier
(Obj_Decl
));
696 Check_Return_Subtype_Indication
(Obj_Decl
);
698 if Present
(HSS
) then
701 if Present
(Exception_Handlers
(HSS
)) then
703 -- ???Has_Nested_Block_With_Handler needs to be set.
704 -- Probably by creating an actual N_Block_Statement.
705 -- Probably in Expand.
711 -- Mark the return object as referenced, since the return is an
712 -- implicit reference of the object.
714 Set_Referenced
(Defining_Identifier
(Obj_Decl
));
716 Check_References
(Stm_Entity
);
720 -- Case of Expr present
724 -- Defend against previous errors
726 and then Nkind
(Expr
) /= N_Empty
727 and then Present
(Etype
(Expr
))
729 -- Apply constraint check. Note that this is done before the implicit
730 -- conversion of the expression done for anonymous access types to
731 -- ensure correct generation of the null-excluding check associated
732 -- with null-excluding expressions found in return statements.
734 Apply_Constraint_Check
(Expr
, R_Type
);
736 -- Ada 2005 (AI-318-02): When the result type is an anonymous access
737 -- type, apply an implicit conversion of the expression to that type
738 -- to force appropriate static and run-time accessibility checks.
740 if Ada_Version
>= Ada_2005
741 and then Ekind
(R_Type
) = E_Anonymous_Access_Type
743 Rewrite
(Expr
, Convert_To
(R_Type
, Relocate_Node
(Expr
)));
744 Analyze_And_Resolve
(Expr
, R_Type
);
747 -- If the result type is class-wide, then check that the return
748 -- expression's type is not declared at a deeper level than the
749 -- function (RM05-6.5(5.6/2)).
751 if Ada_Version
>= Ada_2005
752 and then Is_Class_Wide_Type
(R_Type
)
754 if Type_Access_Level
(Etype
(Expr
)) >
755 Subprogram_Access_Level
(Scope_Id
)
758 ("level of return expression type is deeper than " &
759 "class-wide function!", Expr
);
763 -- Check incorrect use of dynamically tagged expression
765 if Is_Tagged_Type
(R_Type
) then
766 Check_Dynamically_Tagged_Expression
772 -- ??? A real run-time accessibility check is needed in cases
773 -- involving dereferences of access parameters. For now we just
774 -- check the static cases.
776 if (Ada_Version
< Ada_2005
or else Debug_Flag_Dot_L
)
777 and then Is_Immutably_Limited_Type
(Etype
(Scope_Id
))
778 and then Object_Access_Level
(Expr
) >
779 Subprogram_Access_Level
(Scope_Id
)
782 -- Suppress the message in a generic, where the rewriting
785 if Inside_A_Generic
then
790 Make_Raise_Program_Error
(Loc
,
791 Reason
=> PE_Accessibility_Check_Failed
));
795 ("cannot return a local value by reference?", N
);
797 ("\& will be raised at run time?",
798 N
, Standard_Program_Error
);
803 and then Nkind
(Parent
(Scope_Id
)) = N_Function_Specification
804 and then Null_Exclusion_Present
(Parent
(Scope_Id
))
806 Apply_Compile_Time_Constraint_Error
808 Msg
=> "(Ada 2005) null not allowed for "
809 & "null-excluding return?",
810 Reason
=> CE_Null_Not_Allowed
);
813 -- Apply checks suggested by AI05-0144 (dangerous order dependence)
815 Check_Order_Dependence
;
817 end Analyze_Function_Return
;
819 -------------------------------------
820 -- Analyze_Generic_Subprogram_Body --
821 -------------------------------------
823 procedure Analyze_Generic_Subprogram_Body
827 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Id
);
828 Kind
: constant Entity_Kind
:= Ekind
(Gen_Id
);
834 -- Copy body and disable expansion while analyzing the generic For a
835 -- stub, do not copy the stub (which would load the proper body), this
836 -- will be done when the proper body is analyzed.
838 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
839 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
844 Spec
:= Specification
(N
);
846 -- Within the body of the generic, the subprogram is callable, and
847 -- behaves like the corresponding non-generic unit.
849 Body_Id
:= Defining_Entity
(Spec
);
851 if Kind
= E_Generic_Procedure
852 and then Nkind
(Spec
) /= N_Procedure_Specification
854 Error_Msg_N
("invalid body for generic procedure ", Body_Id
);
857 elsif Kind
= E_Generic_Function
858 and then Nkind
(Spec
) /= N_Function_Specification
860 Error_Msg_N
("invalid body for generic function ", Body_Id
);
864 Set_Corresponding_Body
(Gen_Decl
, Body_Id
);
866 if Has_Completion
(Gen_Id
)
867 and then Nkind
(Parent
(N
)) /= N_Subunit
869 Error_Msg_N
("duplicate generic body", N
);
872 Set_Has_Completion
(Gen_Id
);
875 if Nkind
(N
) = N_Subprogram_Body_Stub
then
876 Set_Ekind
(Defining_Entity
(Specification
(N
)), Kind
);
878 Set_Corresponding_Spec
(N
, Gen_Id
);
881 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
882 Set_Cunit_Entity
(Current_Sem_Unit
, Defining_Entity
(N
));
885 -- Make generic parameters immediately visible in the body. They are
886 -- needed to process the formals declarations. Then make the formals
887 -- visible in a separate step.
893 First_Ent
: Entity_Id
;
896 First_Ent
:= First_Entity
(Gen_Id
);
899 while Present
(E
) and then not Is_Formal
(E
) loop
904 Set_Use
(Generic_Formal_Declarations
(Gen_Decl
));
906 -- Now generic formals are visible, and the specification can be
907 -- analyzed, for subsequent conformance check.
909 Body_Id
:= Analyze_Subprogram_Specification
(Spec
);
911 -- Make formal parameters visible
915 -- E is the first formal parameter, we loop through the formals
916 -- installing them so that they will be visible.
918 Set_First_Entity
(Gen_Id
, E
);
919 while Present
(E
) loop
925 -- Visible generic entity is callable within its own body
927 Set_Ekind
(Gen_Id
, Ekind
(Body_Id
));
928 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
929 Set_Convention
(Body_Id
, Convention
(Gen_Id
));
930 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Gen_Id
));
931 Set_Scope
(Body_Id
, Scope
(Gen_Id
));
932 Check_Fully_Conformant
(Body_Id
, Gen_Id
, Body_Id
);
934 if Nkind
(N
) = N_Subprogram_Body_Stub
then
936 -- No body to analyze, so restore state of generic unit
938 Set_Ekind
(Gen_Id
, Kind
);
939 Set_Ekind
(Body_Id
, Kind
);
941 if Present
(First_Ent
) then
942 Set_First_Entity
(Gen_Id
, First_Ent
);
949 -- If this is a compilation unit, it must be made visible explicitly,
950 -- because the compilation of the declaration, unlike other library
951 -- unit declarations, does not. If it is not a unit, the following
952 -- is redundant but harmless.
954 Set_Is_Immediately_Visible
(Gen_Id
);
955 Reference_Body_Formals
(Gen_Id
, Body_Id
);
957 if Is_Child_Unit
(Gen_Id
) then
958 Generate_Reference
(Gen_Id
, Scope
(Gen_Id
), 'k', False);
961 Set_Actual_Subtypes
(N
, Current_Scope
);
962 Process_PPCs
(N
, Gen_Id
, Body_Id
);
964 -- If the generic unit carries pre- or post-conditions, copy them
965 -- to the original generic tree, so that they are properly added
966 -- to any instantiation.
969 Orig
: constant Node_Id
:= Original_Node
(N
);
973 Cond
:= First
(Declarations
(N
));
974 while Present
(Cond
) loop
975 if Nkind
(Cond
) = N_Pragma
976 and then Pragma_Name
(Cond
) = Name_Check
978 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
980 elsif Nkind
(Cond
) = N_Pragma
981 and then Pragma_Name
(Cond
) = Name_Postcondition
983 Set_Ekind
(Defining_Entity
(Orig
), Ekind
(Gen_Id
));
984 Prepend
(New_Copy_Tree
(Cond
), Declarations
(Orig
));
993 Analyze_Declarations
(Declarations
(N
));
995 Analyze
(Handled_Statement_Sequence
(N
));
997 Save_Global_References
(Original_Node
(N
));
999 -- Prior to exiting the scope, include generic formals again (if any
1000 -- are present) in the set of local entities.
1002 if Present
(First_Ent
) then
1003 Set_First_Entity
(Gen_Id
, First_Ent
);
1006 Check_References
(Gen_Id
);
1009 Process_End_Label
(Handled_Statement_Sequence
(N
), 't', Current_Scope
);
1011 Check_Subprogram_Order
(N
);
1013 -- Outside of its body, unit is generic again
1015 Set_Ekind
(Gen_Id
, Kind
);
1016 Generate_Reference
(Gen_Id
, Body_Id
, 'b', Set_Ref
=> False);
1019 Style
.Check_Identifier
(Body_Id
, Gen_Id
);
1023 end Analyze_Generic_Subprogram_Body
;
1025 -----------------------------
1026 -- Analyze_Operator_Symbol --
1027 -----------------------------
1029 -- An operator symbol such as "+" or "and" may appear in context where the
1030 -- literal denotes an entity name, such as "+"(x, y) or in context when it
1031 -- is just a string, as in (conjunction = "or"). In these cases the parser
1032 -- generates this node, and the semantics does the disambiguation. Other
1033 -- such case are actuals in an instantiation, the generic unit in an
1034 -- instantiation, and pragma arguments.
1036 procedure Analyze_Operator_Symbol
(N
: Node_Id
) is
1037 Par
: constant Node_Id
:= Parent
(N
);
1040 if (Nkind
(Par
) = N_Function_Call
1041 and then N
= Name
(Par
))
1042 or else Nkind
(Par
) = N_Function_Instantiation
1043 or else (Nkind
(Par
) = N_Indexed_Component
1044 and then N
= Prefix
(Par
))
1045 or else (Nkind
(Par
) = N_Pragma_Argument_Association
1046 and then not Is_Pragma_String_Literal
(Par
))
1047 or else Nkind
(Par
) = N_Subprogram_Renaming_Declaration
1048 or else (Nkind
(Par
) = N_Attribute_Reference
1049 and then Attribute_Name
(Par
) /= Name_Value
)
1051 Find_Direct_Name
(N
);
1054 Change_Operator_Symbol_To_String_Literal
(N
);
1057 end Analyze_Operator_Symbol
;
1059 -----------------------------------
1060 -- Analyze_Parameter_Association --
1061 -----------------------------------
1063 procedure Analyze_Parameter_Association
(N
: Node_Id
) is
1065 Analyze
(Explicit_Actual_Parameter
(N
));
1066 end Analyze_Parameter_Association
;
1068 --------------------------------------
1069 -- Analyze_Parameterized_Expression --
1070 --------------------------------------
1072 procedure Analyze_Parameterized_Expression
(N
: Node_Id
) is
1073 Loc
: constant Source_Ptr
:= Sloc
(N
);
1074 LocX
: constant Source_Ptr
:= Sloc
(Expression
(N
));
1077 -- This is one of the occasions on which we write things during semantic
1078 -- analysis. Transform the parameterized expression into an equivalent
1079 -- subprogram body, and then analyze that.
1082 Make_Subprogram_Body
(Loc
,
1083 Specification
=> Specification
(N
),
1084 Declarations
=> Empty_List
,
1085 Handled_Statement_Sequence
=>
1086 Make_Handled_Sequence_Of_Statements
(LocX
,
1087 Statements
=> New_List
(
1088 Make_Simple_Return_Statement
(LocX
,
1089 Expression
=> Expression
(N
))))));
1091 end Analyze_Parameterized_Expression
;
1093 ----------------------------
1094 -- Analyze_Procedure_Call --
1095 ----------------------------
1097 procedure Analyze_Procedure_Call
(N
: Node_Id
) is
1098 Loc
: constant Source_Ptr
:= Sloc
(N
);
1099 P
: constant Node_Id
:= Name
(N
);
1100 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
1104 procedure Analyze_Call_And_Resolve
;
1105 -- Do Analyze and Resolve calls for procedure call
1106 -- At end, check illegal order dependence.
1108 ------------------------------
1109 -- Analyze_Call_And_Resolve --
1110 ------------------------------
1112 procedure Analyze_Call_And_Resolve
is
1114 if Nkind
(N
) = N_Procedure_Call_Statement
then
1116 Resolve
(N
, Standard_Void_Type
);
1118 -- Apply checks suggested by AI05-0144
1120 Check_Order_Dependence
;
1125 end Analyze_Call_And_Resolve
;
1127 -- Start of processing for Analyze_Procedure_Call
1130 -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote
1131 -- a procedure call or an entry call. The prefix may denote an access
1132 -- to subprogram type, in which case an implicit dereference applies.
1133 -- If the prefix is an indexed component (without implicit dereference)
1134 -- then the construct denotes a call to a member of an entire family.
1135 -- If the prefix is a simple name, it may still denote a call to a
1136 -- parameterless member of an entry family. Resolution of these various
1137 -- interpretations is delicate.
1141 -- If this is a call of the form Obj.Op, the call may have been
1142 -- analyzed and possibly rewritten into a block, in which case
1145 if Analyzed
(N
) then
1149 -- If there is an error analyzing the name (which may have been
1150 -- rewritten if the original call was in prefix notation) then error
1151 -- has been emitted already, mark node and return.
1154 or else Etype
(Name
(N
)) = Any_Type
1156 Set_Etype
(N
, Any_Type
);
1160 -- Otherwise analyze the parameters
1162 if Present
(Actuals
) then
1163 Actual
:= First
(Actuals
);
1165 while Present
(Actual
) loop
1167 Check_Parameterless_Call
(Actual
);
1172 -- Special processing for Elab_Spec and Elab_Body calls
1174 if Nkind
(P
) = N_Attribute_Reference
1175 and then (Attribute_Name
(P
) = Name_Elab_Spec
1176 or else Attribute_Name
(P
) = Name_Elab_Body
)
1178 if Present
(Actuals
) then
1180 ("no parameters allowed for this call", First
(Actuals
));
1184 Set_Etype
(N
, Standard_Void_Type
);
1187 elsif Is_Entity_Name
(P
)
1188 and then Is_Record_Type
(Etype
(Entity
(P
)))
1189 and then Remote_AST_I_Dereference
(P
)
1193 elsif Is_Entity_Name
(P
)
1194 and then Ekind
(Entity
(P
)) /= E_Entry_Family
1196 if Is_Access_Type
(Etype
(P
))
1197 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1198 and then No
(Actuals
)
1199 and then Comes_From_Source
(N
)
1201 Error_Msg_N
("missing explicit dereference in call", N
);
1204 Analyze_Call_And_Resolve
;
1206 -- If the prefix is the simple name of an entry family, this is
1207 -- a parameterless call from within the task body itself.
1209 elsif Is_Entity_Name
(P
)
1210 and then Nkind
(P
) = N_Identifier
1211 and then Ekind
(Entity
(P
)) = E_Entry_Family
1212 and then Present
(Actuals
)
1213 and then No
(Next
(First
(Actuals
)))
1215 -- Can be call to parameterless entry family. What appears to be the
1216 -- sole argument is in fact the entry index. Rewrite prefix of node
1217 -- accordingly. Source representation is unchanged by this
1221 Make_Indexed_Component
(Loc
,
1223 Make_Selected_Component
(Loc
,
1224 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(P
)), Loc
),
1225 Selector_Name
=> New_Occurrence_Of
(Entity
(P
), Loc
)),
1226 Expressions
=> Actuals
);
1227 Set_Name
(N
, New_N
);
1228 Set_Etype
(New_N
, Standard_Void_Type
);
1229 Set_Parameter_Associations
(N
, No_List
);
1230 Analyze_Call_And_Resolve
;
1232 elsif Nkind
(P
) = N_Explicit_Dereference
then
1233 if Ekind
(Etype
(P
)) = E_Subprogram_Type
then
1234 Analyze_Call_And_Resolve
;
1236 Error_Msg_N
("expect access to procedure in call", P
);
1239 -- The name can be a selected component or an indexed component that
1240 -- yields an access to subprogram. Such a prefix is legal if the call
1241 -- has parameter associations.
1243 elsif Is_Access_Type
(Etype
(P
))
1244 and then Ekind
(Designated_Type
(Etype
(P
))) = E_Subprogram_Type
1246 if Present
(Actuals
) then
1247 Analyze_Call_And_Resolve
;
1249 Error_Msg_N
("missing explicit dereference in call ", N
);
1252 -- If not an access to subprogram, then the prefix must resolve to the
1253 -- name of an entry, entry family, or protected operation.
1255 -- For the case of a simple entry call, P is a selected component where
1256 -- the prefix is the task and the selector name is the entry. A call to
1257 -- a protected procedure will have the same syntax. If the protected
1258 -- object contains overloaded operations, the entity may appear as a
1259 -- function, the context will select the operation whose type is Void.
1261 elsif Nkind
(P
) = N_Selected_Component
1262 and then (Ekind
(Entity
(Selector_Name
(P
))) = E_Entry
1264 Ekind
(Entity
(Selector_Name
(P
))) = E_Procedure
1266 Ekind
(Entity
(Selector_Name
(P
))) = E_Function
)
1268 Analyze_Call_And_Resolve
;
1270 elsif Nkind
(P
) = N_Selected_Component
1271 and then Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
1272 and then Present
(Actuals
)
1273 and then No
(Next
(First
(Actuals
)))
1275 -- Can be call to parameterless entry family. What appears to be the
1276 -- sole argument is in fact the entry index. Rewrite prefix of node
1277 -- accordingly. Source representation is unchanged by this
1281 Make_Indexed_Component
(Loc
,
1282 Prefix
=> New_Copy
(P
),
1283 Expressions
=> Actuals
);
1284 Set_Name
(N
, New_N
);
1285 Set_Etype
(New_N
, Standard_Void_Type
);
1286 Set_Parameter_Associations
(N
, No_List
);
1287 Analyze_Call_And_Resolve
;
1289 -- For the case of a reference to an element of an entry family, P is
1290 -- an indexed component whose prefix is a selected component (task and
1291 -- entry family), and whose index is the entry family index.
1293 elsif Nkind
(P
) = N_Indexed_Component
1294 and then Nkind
(Prefix
(P
)) = N_Selected_Component
1295 and then Ekind
(Entity
(Selector_Name
(Prefix
(P
)))) = E_Entry_Family
1297 Analyze_Call_And_Resolve
;
1299 -- If the prefix is the name of an entry family, it is a call from
1300 -- within the task body itself.
1302 elsif Nkind
(P
) = N_Indexed_Component
1303 and then Nkind
(Prefix
(P
)) = N_Identifier
1304 and then Ekind
(Entity
(Prefix
(P
))) = E_Entry_Family
1307 Make_Selected_Component
(Loc
,
1308 Prefix
=> New_Occurrence_Of
(Scope
(Entity
(Prefix
(P
))), Loc
),
1309 Selector_Name
=> New_Occurrence_Of
(Entity
(Prefix
(P
)), Loc
));
1310 Rewrite
(Prefix
(P
), New_N
);
1312 Analyze_Call_And_Resolve
;
1314 -- Anything else is an error
1317 Error_Msg_N
("invalid procedure or entry call", N
);
1319 end Analyze_Procedure_Call
;
1321 -------------------------------------
1322 -- Analyze_Simple_Return_Statement --
1323 -------------------------------------
1325 procedure Analyze_Simple_Return_Statement
(N
: Node_Id
) is
1327 if Present
(Expression
(N
)) then
1328 Mark_Coextensions
(N
, Expression
(N
));
1331 Analyze_Return_Statement
(N
);
1332 end Analyze_Simple_Return_Statement
;
1334 -------------------------
1335 -- Analyze_Return_Type --
1336 -------------------------
1338 procedure Analyze_Return_Type
(N
: Node_Id
) is
1339 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
1340 Typ
: Entity_Id
:= Empty
;
1343 -- Normal case where result definition does not indicate an error
1345 if Result_Definition
(N
) /= Error
then
1346 if Nkind
(Result_Definition
(N
)) = N_Access_Definition
then
1348 -- Ada 2005 (AI-254): Handle anonymous access to subprograms
1351 AD
: constant Node_Id
:=
1352 Access_To_Subprogram_Definition
(Result_Definition
(N
));
1354 if Present
(AD
) and then Protected_Present
(AD
) then
1355 Typ
:= Replace_Anonymous_Access_To_Protected_Subprogram
(N
);
1357 Typ
:= Access_Definition
(N
, Result_Definition
(N
));
1361 Set_Parent
(Typ
, Result_Definition
(N
));
1362 Set_Is_Local_Anonymous_Access
(Typ
);
1363 Set_Etype
(Designator
, Typ
);
1365 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1367 Null_Exclusion_Static_Checks
(N
);
1369 -- Subtype_Mark case
1372 Find_Type
(Result_Definition
(N
));
1373 Typ
:= Entity
(Result_Definition
(N
));
1374 Set_Etype
(Designator
, Typ
);
1376 -- Ada 2005 (AI-231): Ensure proper usage of null exclusion
1378 Null_Exclusion_Static_Checks
(N
);
1380 -- If a null exclusion is imposed on the result type, then create
1381 -- a null-excluding itype (an access subtype) and use it as the
1382 -- function's Etype. Note that the null exclusion checks are done
1383 -- right before this, because they don't get applied to types that
1384 -- do not come from source.
1386 if Is_Access_Type
(Typ
)
1387 and then Null_Exclusion_Present
(N
)
1389 Set_Etype
(Designator
,
1390 Create_Null_Excluding_Itype
1393 Scope_Id
=> Scope
(Current_Scope
)));
1395 -- The new subtype must be elaborated before use because
1396 -- it is visible outside of the function. However its base
1397 -- type may not be frozen yet, so the reference that will
1398 -- force elaboration must be attached to the freezing of
1401 -- If the return specification appears on a proper body,
1402 -- the subtype will have been created already on the spec.
1404 if Is_Frozen
(Typ
) then
1405 if Nkind
(Parent
(N
)) = N_Subprogram_Body
1406 and then Nkind
(Parent
(Parent
(N
))) = N_Subunit
1410 Build_Itype_Reference
(Etype
(Designator
), Parent
(N
));
1414 Ensure_Freeze_Node
(Typ
);
1417 IR
: constant Node_Id
:= Make_Itype_Reference
(Sloc
(N
));
1419 Set_Itype
(IR
, Etype
(Designator
));
1420 Append_Freeze_Actions
(Typ
, New_List
(IR
));
1425 Set_Etype
(Designator
, Typ
);
1428 if Ekind
(Typ
) = E_Incomplete_Type
1429 and then Is_Value_Type
(Typ
)
1433 elsif Ekind
(Typ
) = E_Incomplete_Type
1434 or else (Is_Class_Wide_Type
(Typ
)
1436 Ekind
(Root_Type
(Typ
)) = E_Incomplete_Type
)
1438 -- AI05-0151: Tagged incomplete types are allowed in all formal
1439 -- parts. Untagged incomplete types are not allowed in bodies.
1441 if Ada_Version
>= Ada_2012
then
1442 if Is_Tagged_Type
(Typ
) then
1445 elsif Nkind_In
(Parent
(Parent
(N
)),
1451 ("invalid use of untagged incomplete type&",
1457 ("invalid use of incomplete type&", Designator
, Typ
);
1462 -- Case where result definition does indicate an error
1465 Set_Etype
(Designator
, Any_Type
);
1467 end Analyze_Return_Type
;
1469 -----------------------------
1470 -- Analyze_Subprogram_Body --
1471 -----------------------------
1473 procedure Analyze_Subprogram_Body
(N
: Node_Id
) is
1474 Loc
: constant Source_Ptr
:= Sloc
(N
);
1475 Body_Spec
: constant Node_Id
:= Specification
(N
);
1476 Body_Id
: constant Entity_Id
:= Defining_Entity
(Body_Spec
);
1479 if Debug_Flag_C
then
1480 Write_Str
("==> subprogram body ");
1481 Write_Name
(Chars
(Body_Id
));
1482 Write_Str
(" from ");
1483 Write_Location
(Loc
);
1488 Trace_Scope
(N
, Body_Id
, " Analyze subprogram: ");
1490 -- The real work is split out into the helper, so it can do "return;"
1491 -- without skipping the debug output:
1493 Analyze_Subprogram_Body_Helper
(N
);
1495 if Debug_Flag_C
then
1497 Write_Str
("<== subprogram body ");
1498 Write_Name
(Chars
(Body_Id
));
1499 Write_Str
(" from ");
1500 Write_Location
(Loc
);
1503 end Analyze_Subprogram_Body
;
1505 ------------------------------------
1506 -- Analyze_Subprogram_Body_Helper --
1507 ------------------------------------
1509 -- This procedure is called for regular subprogram bodies, generic bodies,
1510 -- and for subprogram stubs of both kinds. In the case of stubs, only the
1511 -- specification matters, and is used to create a proper declaration for
1512 -- the subprogram, or to perform conformance checks.
1514 procedure Analyze_Subprogram_Body_Helper
(N
: Node_Id
) is
1515 Loc
: constant Source_Ptr
:= Sloc
(N
);
1516 Body_Deleted
: constant Boolean := False;
1517 Body_Spec
: constant Node_Id
:= Specification
(N
);
1518 Body_Id
: Entity_Id
:= Defining_Entity
(Body_Spec
);
1519 Prev_Id
: constant Entity_Id
:= Current_Entity_In_Scope
(Body_Id
);
1520 Conformant
: Boolean;
1523 Prot_Typ
: Entity_Id
:= Empty
;
1524 Spec_Id
: Entity_Id
;
1525 Spec_Decl
: Node_Id
:= Empty
;
1527 Last_Real_Spec_Entity
: Entity_Id
:= Empty
;
1528 -- When we analyze a separate spec, the entity chain ends up containing
1529 -- the formals, as well as any itypes generated during analysis of the
1530 -- default expressions for parameters, or the arguments of associated
1531 -- precondition/postcondition pragmas (which are analyzed in the context
1532 -- of the spec since they have visibility on formals).
1534 -- These entities belong with the spec and not the body. However we do
1535 -- the analysis of the body in the context of the spec (again to obtain
1536 -- visibility to the formals), and all the entities generated during
1537 -- this analysis end up also chained to the entity chain of the spec.
1538 -- But they really belong to the body, and there is circuitry to move
1539 -- them from the spec to the body.
1541 -- However, when we do this move, we don't want to move the real spec
1542 -- entities (first para above) to the body. The Last_Real_Spec_Entity
1543 -- variable points to the last real spec entity, so we only move those
1544 -- chained beyond that point. It is initialized to Empty to deal with
1545 -- the case where there is no separate spec.
1547 procedure Check_Anonymous_Return
;
1548 -- Ada 2005: if a function returns an access type that denotes a task,
1549 -- or a type that contains tasks, we must create a master entity for
1550 -- the anonymous type, which typically will be used in an allocator
1551 -- in the body of the function.
1553 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
);
1554 -- Look ahead to recognize a pragma that may appear after the body.
1555 -- If there is a previous spec, check that it appears in the same
1556 -- declarative part. If the pragma is Inline_Always, perform inlining
1557 -- unconditionally, otherwise only if Front_End_Inlining is requested.
1558 -- If the body acts as a spec, and inlining is required, we create a
1559 -- subprogram declaration for it, in order to attach the body to inline.
1560 -- If pragma does not appear after the body, check whether there is
1561 -- an inline pragma before any local declarations.
1563 procedure Check_Missing_Return
;
1564 -- Checks for a function with a no return statements, and also performs
1565 -- the warning checks implemented by Check_Returns.
1567 function Disambiguate_Spec
return Entity_Id
;
1568 -- When a primitive is declared between the private view and the full
1569 -- view of a concurrent type which implements an interface, a special
1570 -- mechanism is used to find the corresponding spec of the primitive
1573 function Is_Private_Concurrent_Primitive
1574 (Subp_Id
: Entity_Id
) return Boolean;
1575 -- Determine whether subprogram Subp_Id is a primitive of a concurrent
1576 -- type that implements an interface and has a private view.
1578 procedure Set_Trivial_Subprogram
(N
: Node_Id
);
1579 -- Sets the Is_Trivial_Subprogram flag in both spec and body of the
1580 -- subprogram whose body is being analyzed. N is the statement node
1581 -- causing the flag to be set, if the following statement is a return
1582 -- of an entity, we mark the entity as set in source to suppress any
1583 -- warning on the stylized use of function stubs with a dummy return.
1585 procedure Verify_Overriding_Indicator
;
1586 -- If there was a previous spec, the entity has been entered in the
1587 -- current scope previously. If the body itself carries an overriding
1588 -- indicator, check that it is consistent with the known status of the
1591 ----------------------------
1592 -- Check_Anonymous_Return --
1593 ----------------------------
1595 procedure Check_Anonymous_Return
is
1601 if Present
(Spec_Id
) then
1607 if Ekind
(Scop
) = E_Function
1608 and then Ekind
(Etype
(Scop
)) = E_Anonymous_Access_Type
1609 and then not Is_Thunk
(Scop
)
1610 and then (Has_Task
(Designated_Type
(Etype
(Scop
)))
1612 (Is_Class_Wide_Type
(Designated_Type
(Etype
(Scop
)))
1614 Is_Limited_Record
(Designated_Type
(Etype
(Scop
)))))
1615 and then Expander_Active
1617 -- Avoid cases with no tasking support
1619 and then RTE_Available
(RE_Current_Master
)
1620 and then not Restriction_Active
(No_Task_Hierarchy
)
1623 Make_Object_Declaration
(Loc
,
1624 Defining_Identifier
=>
1625 Make_Defining_Identifier
(Loc
, Name_uMaster
),
1626 Constant_Present
=> True,
1627 Object_Definition
=>
1628 New_Reference_To
(RTE
(RE_Master_Id
), Loc
),
1630 Make_Explicit_Dereference
(Loc
,
1631 New_Reference_To
(RTE
(RE_Current_Master
), Loc
)));
1633 if Present
(Declarations
(N
)) then
1634 Prepend
(Decl
, Declarations
(N
));
1636 Set_Declarations
(N
, New_List
(Decl
));
1639 Set_Master_Id
(Etype
(Scop
), Defining_Identifier
(Decl
));
1640 Set_Has_Master_Entity
(Scop
);
1642 -- Now mark the containing scope as a task master
1645 while Nkind
(Par
) /= N_Compilation_Unit
loop
1646 Par
:= Parent
(Par
);
1647 pragma Assert
(Present
(Par
));
1649 -- If we fall off the top, we are at the outer level, and
1650 -- the environment task is our effective master, so nothing
1654 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
1656 Set_Is_Task_Master
(Par
, True);
1661 end Check_Anonymous_Return
;
1663 -------------------------
1664 -- Check_Inline_Pragma --
1665 -------------------------
1667 procedure Check_Inline_Pragma
(Spec
: in out Node_Id
) is
1671 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean;
1672 -- True when N is a pragma Inline or Inline_Always that applies
1673 -- to this subprogram.
1675 -----------------------
1676 -- Is_Inline_Pragma --
1677 -----------------------
1679 function Is_Inline_Pragma
(N
: Node_Id
) return Boolean is
1682 Nkind
(N
) = N_Pragma
1684 (Pragma_Name
(N
) = Name_Inline_Always
1687 and then Pragma_Name
(N
) = Name_Inline
))
1690 (Expression
(First
(Pragma_Argument_Associations
(N
))))
1692 end Is_Inline_Pragma
;
1694 -- Start of processing for Check_Inline_Pragma
1697 if not Expander_Active
then
1701 if Is_List_Member
(N
)
1702 and then Present
(Next
(N
))
1703 and then Is_Inline_Pragma
(Next
(N
))
1707 elsif Nkind
(N
) /= N_Subprogram_Body_Stub
1708 and then Present
(Declarations
(N
))
1709 and then Is_Inline_Pragma
(First
(Declarations
(N
)))
1711 Prag
:= First
(Declarations
(N
));
1717 if Present
(Prag
) then
1718 if Present
(Spec_Id
) then
1719 if In_Same_List
(N
, Unit_Declaration_Node
(Spec_Id
)) then
1724 -- Create a subprogram declaration, to make treatment uniform
1727 Subp
: constant Entity_Id
:=
1728 Make_Defining_Identifier
(Loc
, Chars
(Body_Id
));
1729 Decl
: constant Node_Id
:=
1730 Make_Subprogram_Declaration
(Loc
,
1732 New_Copy_Tree
(Specification
(N
)));
1735 Set_Defining_Unit_Name
(Specification
(Decl
), Subp
);
1737 if Present
(First_Formal
(Body_Id
)) then
1738 Plist
:= Copy_Parameter_List
(Body_Id
);
1739 Set_Parameter_Specifications
1740 (Specification
(Decl
), Plist
);
1743 Insert_Before
(N
, Decl
);
1746 Set_Has_Pragma_Inline
(Subp
);
1748 if Pragma_Name
(Prag
) = Name_Inline_Always
then
1749 Set_Is_Inlined
(Subp
);
1750 Set_Has_Pragma_Inline_Always
(Subp
);
1757 end Check_Inline_Pragma
;
1759 --------------------------
1760 -- Check_Missing_Return --
1761 --------------------------
1763 procedure Check_Missing_Return
is
1765 Missing_Ret
: Boolean;
1768 if Nkind
(Body_Spec
) = N_Function_Specification
then
1769 if Present
(Spec_Id
) then
1775 if Return_Present
(Id
) then
1776 Check_Returns
(HSS
, 'F', Missing_Ret
);
1779 Set_Has_Missing_Return
(Id
);
1782 elsif (Is_Generic_Subprogram
(Id
)
1783 or else not Is_Machine_Code_Subprogram
(Id
))
1784 and then not Body_Deleted
1786 Error_Msg_N
("missing RETURN statement in function body", N
);
1789 -- If procedure with No_Return, check returns
1791 elsif Nkind
(Body_Spec
) = N_Procedure_Specification
1792 and then Present
(Spec_Id
)
1793 and then No_Return
(Spec_Id
)
1795 Check_Returns
(HSS
, 'P', Missing_Ret
, Spec_Id
);
1797 end Check_Missing_Return
;
1799 -----------------------
1800 -- Disambiguate_Spec --
1801 -----------------------
1803 function Disambiguate_Spec
return Entity_Id
is
1804 Priv_Spec
: Entity_Id
;
1807 procedure Replace_Types
(To_Corresponding
: Boolean);
1808 -- Depending on the flag, replace the type of formal parameters of
1809 -- Body_Id if it is a concurrent type implementing interfaces with
1810 -- the corresponding record type or the other way around.
1812 procedure Replace_Types
(To_Corresponding
: Boolean) is
1814 Formal_Typ
: Entity_Id
;
1817 Formal
:= First_Formal
(Body_Id
);
1818 while Present
(Formal
) loop
1819 Formal_Typ
:= Etype
(Formal
);
1821 -- From concurrent type to corresponding record
1823 if To_Corresponding
then
1824 if Is_Concurrent_Type
(Formal_Typ
)
1825 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
1826 and then Present
(Interfaces
(
1827 Corresponding_Record_Type
(Formal_Typ
)))
1830 Corresponding_Record_Type
(Formal_Typ
));
1833 -- From corresponding record to concurrent type
1836 if Is_Concurrent_Record_Type
(Formal_Typ
)
1837 and then Present
(Interfaces
(Formal_Typ
))
1840 Corresponding_Concurrent_Type
(Formal_Typ
));
1844 Next_Formal
(Formal
);
1848 -- Start of processing for Disambiguate_Spec
1851 -- Try to retrieve the specification of the body as is. All error
1852 -- messages are suppressed because the body may not have a spec in
1853 -- its current state.
1855 Spec_N
:= Find_Corresponding_Spec
(N
, False);
1857 -- It is possible that this is the body of a primitive declared
1858 -- between a private and a full view of a concurrent type. The
1859 -- controlling parameter of the spec carries the concurrent type,
1860 -- not the corresponding record type as transformed by Analyze_
1861 -- Subprogram_Specification. In such cases, we undo the change
1862 -- made by the analysis of the specification and try to find the
1865 -- Note that wrappers already have their corresponding specs and
1866 -- bodies set during their creation, so if the candidate spec is
1867 -- a wrapper, then we definitely need to swap all types to their
1868 -- original concurrent status.
1871 or else Is_Primitive_Wrapper
(Spec_N
)
1873 -- Restore all references of corresponding record types to the
1874 -- original concurrent types.
1876 Replace_Types
(To_Corresponding
=> False);
1877 Priv_Spec
:= Find_Corresponding_Spec
(N
, False);
1879 -- The current body truly belongs to a primitive declared between
1880 -- a private and a full view. We leave the modified body as is,
1881 -- and return the true spec.
1883 if Present
(Priv_Spec
)
1884 and then Is_Private_Primitive
(Priv_Spec
)
1889 -- In case that this is some sort of error, restore the original
1890 -- state of the body.
1892 Replace_Types
(To_Corresponding
=> True);
1896 end Disambiguate_Spec
;
1898 -------------------------------------
1899 -- Is_Private_Concurrent_Primitive --
1900 -------------------------------------
1902 function Is_Private_Concurrent_Primitive
1903 (Subp_Id
: Entity_Id
) return Boolean
1905 Formal_Typ
: Entity_Id
;
1908 if Present
(First_Formal
(Subp_Id
)) then
1909 Formal_Typ
:= Etype
(First_Formal
(Subp_Id
));
1911 if Is_Concurrent_Record_Type
(Formal_Typ
) then
1912 Formal_Typ
:= Corresponding_Concurrent_Type
(Formal_Typ
);
1915 -- The type of the first formal is a concurrent tagged type with
1919 Is_Concurrent_Type
(Formal_Typ
)
1920 and then Is_Tagged_Type
(Formal_Typ
)
1921 and then Has_Private_Declaration
(Formal_Typ
);
1925 end Is_Private_Concurrent_Primitive
;
1927 ----------------------------
1928 -- Set_Trivial_Subprogram --
1929 ----------------------------
1931 procedure Set_Trivial_Subprogram
(N
: Node_Id
) is
1932 Nxt
: constant Node_Id
:= Next
(N
);
1935 Set_Is_Trivial_Subprogram
(Body_Id
);
1937 if Present
(Spec_Id
) then
1938 Set_Is_Trivial_Subprogram
(Spec_Id
);
1942 and then Nkind
(Nxt
) = N_Simple_Return_Statement
1943 and then No
(Next
(Nxt
))
1944 and then Present
(Expression
(Nxt
))
1945 and then Is_Entity_Name
(Expression
(Nxt
))
1947 Set_Never_Set_In_Source
(Entity
(Expression
(Nxt
)), False);
1949 end Set_Trivial_Subprogram
;
1951 ---------------------------------
1952 -- Verify_Overriding_Indicator --
1953 ---------------------------------
1955 procedure Verify_Overriding_Indicator
is
1957 if Must_Override
(Body_Spec
) then
1958 if Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1959 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1963 elsif not Present
(Overridden_Operation
(Spec_Id
)) then
1965 ("subprogram& is not overriding", Body_Spec
, Spec_Id
);
1968 elsif Must_Not_Override
(Body_Spec
) then
1969 if Present
(Overridden_Operation
(Spec_Id
)) then
1971 ("subprogram& overrides inherited operation",
1972 Body_Spec
, Spec_Id
);
1974 elsif Nkind
(Spec_Id
) = N_Defining_Operator_Symbol
1975 and then Operator_Matches_Spec
(Spec_Id
, Spec_Id
)
1978 ("subprogram & overrides predefined operator ",
1979 Body_Spec
, Spec_Id
);
1981 -- If this is not a primitive operation or protected subprogram,
1982 -- then the overriding indicator is altogether illegal.
1984 elsif not Is_Primitive
(Spec_Id
)
1985 and then Ekind
(Scope
(Spec_Id
)) /= E_Protected_Type
1988 ("overriding indicator only allowed " &
1989 "if subprogram is primitive",
1993 elsif Style_Check
-- ??? incorrect use of Style_Check!
1994 and then Present
(Overridden_Operation
(Spec_Id
))
1996 pragma Assert
(Unit_Declaration_Node
(Body_Id
) = N
);
1997 Style
.Missing_Overriding
(N
, Body_Id
);
1999 end Verify_Overriding_Indicator
;
2001 -- Start of processing for Analyze_Subprogram_Body_Helper
2004 -- Generic subprograms are handled separately. They always have a
2005 -- generic specification. Determine whether current scope has a
2006 -- previous declaration.
2008 -- If the subprogram body is defined within an instance of the same
2009 -- name, the instance appears as a package renaming, and will be hidden
2010 -- within the subprogram.
2012 if Present
(Prev_Id
)
2013 and then not Is_Overloadable
(Prev_Id
)
2014 and then (Nkind
(Parent
(Prev_Id
)) /= N_Package_Renaming_Declaration
2015 or else Comes_From_Source
(Prev_Id
))
2017 if Is_Generic_Subprogram
(Prev_Id
) then
2019 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
2020 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
2022 Analyze_Generic_Subprogram_Body
(N
, Spec_Id
);
2024 if Nkind
(N
) = N_Subprogram_Body
then
2025 HSS
:= Handled_Statement_Sequence
(N
);
2026 Check_Missing_Return
;
2032 -- Previous entity conflicts with subprogram name. Attempting to
2033 -- enter name will post error.
2035 Enter_Name
(Body_Id
);
2039 -- Non-generic case, find the subprogram declaration, if one was seen,
2040 -- or enter new overloaded entity in the current scope. If the
2041 -- Current_Entity is the Body_Id itself, the unit is being analyzed as
2042 -- part of the context of one of its subunits. No need to redo the
2045 elsif Prev_Id
= Body_Id
2046 and then Has_Completion
(Body_Id
)
2051 Body_Id
:= Analyze_Subprogram_Specification
(Body_Spec
);
2053 if Nkind
(N
) = N_Subprogram_Body_Stub
2054 or else No
(Corresponding_Spec
(N
))
2056 if Is_Private_Concurrent_Primitive
(Body_Id
) then
2057 Spec_Id
:= Disambiguate_Spec
;
2059 Spec_Id
:= Find_Corresponding_Spec
(N
);
2062 -- If this is a duplicate body, no point in analyzing it
2064 if Error_Posted
(N
) then
2068 -- A subprogram body should cause freezing of its own declaration,
2069 -- but if there was no previous explicit declaration, then the
2070 -- subprogram will get frozen too late (there may be code within
2071 -- the body that depends on the subprogram having been frozen,
2072 -- such as uses of extra formals), so we force it to be frozen
2073 -- here. Same holds if the body and spec are compilation units.
2074 -- Finally, if the return type is an anonymous access to protected
2075 -- subprogram, it must be frozen before the body because its
2076 -- expansion has generated an equivalent type that is used when
2077 -- elaborating the body.
2079 if No
(Spec_Id
) then
2080 Freeze_Before
(N
, Body_Id
);
2082 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2083 Freeze_Before
(N
, Spec_Id
);
2085 elsif Is_Access_Subprogram_Type
(Etype
(Body_Id
)) then
2086 Freeze_Before
(N
, Etype
(Body_Id
));
2090 Spec_Id
:= Corresponding_Spec
(N
);
2094 -- Do not inline any subprogram that contains nested subprograms, since
2095 -- the backend inlining circuit seems to generate uninitialized
2096 -- references in this case. We know this happens in the case of front
2097 -- end ZCX support, but it also appears it can happen in other cases as
2098 -- well. The backend often rejects attempts to inline in the case of
2099 -- nested procedures anyway, so little if anything is lost by this.
2100 -- Note that this is test is for the benefit of the back-end. There is
2101 -- a separate test for front-end inlining that also rejects nested
2104 -- Do not do this test if errors have been detected, because in some
2105 -- error cases, this code blows up, and we don't need it anyway if
2106 -- there have been errors, since we won't get to the linker anyway.
2108 if Comes_From_Source
(Body_Id
)
2109 and then Serious_Errors_Detected
= 0
2113 P_Ent
:= Scope
(P_Ent
);
2114 exit when No
(P_Ent
) or else P_Ent
= Standard_Standard
;
2116 if Is_Subprogram
(P_Ent
) then
2117 Set_Is_Inlined
(P_Ent
, False);
2119 if Comes_From_Source
(P_Ent
)
2120 and then Has_Pragma_Inline
(P_Ent
)
2123 ("cannot inline& (nested subprogram)?",
2130 Check_Inline_Pragma
(Spec_Id
);
2132 -- Deal with special case of a fully private operation in the body of
2133 -- the protected type. We must create a declaration for the subprogram,
2134 -- in order to attach the protected subprogram that will be used in
2135 -- internal calls. We exclude compiler generated bodies from the
2136 -- expander since the issue does not arise for those cases.
2139 and then Comes_From_Source
(N
)
2140 and then Is_Protected_Type
(Current_Scope
)
2142 Spec_Id
:= Build_Private_Protected_Declaration
(N
);
2145 -- If a separate spec is present, then deal with freezing issues
2147 if Present
(Spec_Id
) then
2148 Spec_Decl
:= Unit_Declaration_Node
(Spec_Id
);
2149 Verify_Overriding_Indicator
;
2151 -- In general, the spec will be frozen when we start analyzing the
2152 -- body. However, for internally generated operations, such as
2153 -- wrapper functions for inherited operations with controlling
2154 -- results, the spec may not have been frozen by the time we
2155 -- expand the freeze actions that include the bodies. In particular,
2156 -- extra formals for accessibility or for return-in-place may need
2157 -- to be generated. Freeze nodes, if any, are inserted before the
2160 if not Is_Frozen
(Spec_Id
)
2161 and then Expander_Active
2163 -- Force the generation of its freezing node to ensure proper
2164 -- management of access types in the backend.
2166 -- This is definitely needed for some cases, but it is not clear
2167 -- why, to be investigated further???
2169 Set_Has_Delayed_Freeze
(Spec_Id
);
2170 Freeze_Before
(N
, Spec_Id
);
2174 -- Mark presence of postcondition procedure in current scope and mark
2175 -- the procedure itself as needing debug info. The latter is important
2176 -- when analyzing decision coverage (for example, for MC/DC coverage).
2178 if Chars
(Body_Id
) = Name_uPostconditions
then
2179 Set_Has_Postconditions
(Current_Scope
);
2180 Set_Debug_Info_Needed
(Body_Id
);
2183 -- Place subprogram on scope stack, and make formals visible. If there
2184 -- is a spec, the visible entity remains that of the spec.
2186 if Present
(Spec_Id
) then
2187 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
2189 if Is_Child_Unit
(Spec_Id
) then
2190 Generate_Reference
(Spec_Id
, Scope
(Spec_Id
), 'k', False);
2194 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
2197 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
2198 Set_Is_Child_Unit
(Body_Id
, Is_Child_Unit
(Spec_Id
));
2200 if Is_Abstract_Subprogram
(Spec_Id
) then
2201 Error_Msg_N
("an abstract subprogram cannot have a body", N
);
2205 Set_Convention
(Body_Id
, Convention
(Spec_Id
));
2206 Set_Has_Completion
(Spec_Id
);
2208 if Is_Protected_Type
(Scope
(Spec_Id
)) then
2209 Prot_Typ
:= Scope
(Spec_Id
);
2212 -- If this is a body generated for a renaming, do not check for
2213 -- full conformance. The check is redundant, because the spec of
2214 -- the body is a copy of the spec in the renaming declaration,
2215 -- and the test can lead to spurious errors on nested defaults.
2217 if Present
(Spec_Decl
)
2218 and then not Comes_From_Source
(N
)
2220 (Nkind
(Original_Node
(Spec_Decl
)) =
2221 N_Subprogram_Renaming_Declaration
2222 or else (Present
(Corresponding_Body
(Spec_Decl
))
2224 Nkind
(Unit_Declaration_Node
2225 (Corresponding_Body
(Spec_Decl
))) =
2226 N_Subprogram_Renaming_Declaration
))
2230 -- Conversely, the spec may have been generated for specless body
2231 -- with an inline pragma.
2233 elsif Comes_From_Source
(N
)
2234 and then not Comes_From_Source
(Spec_Id
)
2235 and then Has_Pragma_Inline
(Spec_Id
)
2242 Fully_Conformant
, True, Conformant
, Body_Id
);
2245 -- If the body is not fully conformant, we have to decide if we
2246 -- should analyze it or not. If it has a really messed up profile
2247 -- then we probably should not analyze it, since we will get too
2248 -- many bogus messages.
2250 -- Our decision is to go ahead in the non-fully conformant case
2251 -- only if it is at least mode conformant with the spec. Note
2252 -- that the call to Check_Fully_Conformant has issued the proper
2253 -- error messages to complain about the lack of conformance.
2256 and then not Mode_Conformant
(Body_Id
, Spec_Id
)
2262 if Spec_Id
/= Body_Id
then
2263 Reference_Body_Formals
(Spec_Id
, Body_Id
);
2266 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2267 Set_Corresponding_Spec
(N
, Spec_Id
);
2269 -- Ada 2005 (AI-345): If the operation is a primitive operation
2270 -- of a concurrent type, the type of the first parameter has been
2271 -- replaced with the corresponding record, which is the proper
2272 -- run-time structure to use. However, within the body there may
2273 -- be uses of the formals that depend on primitive operations
2274 -- of the type (in particular calls in prefixed form) for which
2275 -- we need the original concurrent type. The operation may have
2276 -- several controlling formals, so the replacement must be done
2279 if Comes_From_Source
(Spec_Id
)
2280 and then Present
(First_Entity
(Spec_Id
))
2281 and then Ekind
(Etype
(First_Entity
(Spec_Id
))) = E_Record_Type
2282 and then Is_Tagged_Type
(Etype
(First_Entity
(Spec_Id
)))
2284 Present
(Interfaces
(Etype
(First_Entity
(Spec_Id
))))
2287 (Corresponding_Concurrent_Type
2288 (Etype
(First_Entity
(Spec_Id
))))
2291 Typ
: constant Entity_Id
:= Etype
(First_Entity
(Spec_Id
));
2295 Form
:= First_Formal
(Spec_Id
);
2296 while Present
(Form
) loop
2297 if Etype
(Form
) = Typ
then
2298 Set_Etype
(Form
, Corresponding_Concurrent_Type
(Typ
));
2306 -- Make the formals visible, and place subprogram on scope stack.
2307 -- This is also the point at which we set Last_Real_Spec_Entity
2308 -- to mark the entities which will not be moved to the body.
2310 Install_Formals
(Spec_Id
);
2311 Last_Real_Spec_Entity
:= Last_Entity
(Spec_Id
);
2312 Push_Scope
(Spec_Id
);
2314 -- Make sure that the subprogram is immediately visible. For
2315 -- child units that have no separate spec this is indispensable.
2316 -- Otherwise it is safe albeit redundant.
2318 Set_Is_Immediately_Visible
(Spec_Id
);
2321 Set_Corresponding_Body
(Unit_Declaration_Node
(Spec_Id
), Body_Id
);
2322 Set_Ekind
(Body_Id
, E_Subprogram_Body
);
2323 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
2324 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
2326 -- Case of subprogram body with no previous spec
2329 -- Check for style warning required
2333 -- Only apply check for source level subprograms for which checks
2334 -- have not been suppressed.
2336 and then Comes_From_Source
(Body_Id
)
2337 and then not Suppress_Style_Checks
(Body_Id
)
2339 -- No warnings within an instance
2341 and then not In_Instance
2343 -- No warnings for parameterized expressions
2345 and then Nkind
(Original_Node
(N
)) /= N_Parameterized_Expression
2347 Style
.Body_With_No_Spec
(N
);
2350 New_Overloaded_Entity
(Body_Id
);
2352 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
2353 Set_Acts_As_Spec
(N
);
2354 Generate_Definition
(Body_Id
);
2356 (Body_Id
, Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
2357 Generate_Reference_To_Formals
(Body_Id
);
2358 Install_Formals
(Body_Id
);
2359 Push_Scope
(Body_Id
);
2363 -- If the return type is an anonymous access type whose designated type
2364 -- is the limited view of a class-wide type and the non-limited view is
2365 -- available, update the return type accordingly.
2367 if Ada_Version
>= Ada_2005
2368 and then Comes_From_Source
(N
)
2375 Rtyp
:= Etype
(Current_Scope
);
2377 if Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
2378 Etyp
:= Directly_Designated_Type
(Rtyp
);
2380 if Is_Class_Wide_Type
(Etyp
)
2381 and then From_With_Type
(Etyp
)
2383 Set_Directly_Designated_Type
2384 (Etype
(Current_Scope
), Available_View
(Etyp
));
2390 -- If this is the proper body of a stub, we must verify that the stub
2391 -- conforms to the body, and to the previous spec if one was present.
2392 -- we know already that the body conforms to that spec. This test is
2393 -- only required for subprograms that come from source.
2395 if Nkind
(Parent
(N
)) = N_Subunit
2396 and then Comes_From_Source
(N
)
2397 and then not Error_Posted
(Body_Id
)
2398 and then Nkind
(Corresponding_Stub
(Parent
(N
))) =
2399 N_Subprogram_Body_Stub
2402 Old_Id
: constant Entity_Id
:=
2404 (Specification
(Corresponding_Stub
(Parent
(N
))));
2406 Conformant
: Boolean := False;
2409 if No
(Spec_Id
) then
2410 Check_Fully_Conformant
(Body_Id
, Old_Id
);
2414 (Body_Id
, Old_Id
, Fully_Conformant
, False, Conformant
);
2416 if not Conformant
then
2418 -- The stub was taken to be a new declaration. Indicate
2419 -- that it lacks a body.
2421 Set_Has_Completion
(Old_Id
, False);
2427 Set_Has_Completion
(Body_Id
);
2428 Check_Eliminated
(Body_Id
);
2430 if Nkind
(N
) = N_Subprogram_Body_Stub
then
2433 elsif Present
(Spec_Id
)
2434 and then Expander_Active
2436 (Has_Pragma_Inline_Always
(Spec_Id
)
2437 or else (Has_Pragma_Inline
(Spec_Id
) and Front_End_Inlining
))
2439 Build_Body_To_Inline
(N
, Spec_Id
);
2442 -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis
2443 -- if its specification we have to install the private withed units.
2444 -- This holds for child units as well.
2446 if Is_Compilation_Unit
(Body_Id
)
2447 or else Nkind
(Parent
(N
)) = N_Compilation_Unit
2449 Install_Private_With_Clauses
(Body_Id
);
2452 Check_Anonymous_Return
;
2454 -- Set the Protected_Formal field of each extra formal of the protected
2455 -- subprogram to reference the corresponding extra formal of the
2456 -- subprogram that implements it. For regular formals this occurs when
2457 -- the protected subprogram's declaration is expanded, but the extra
2458 -- formals don't get created until the subprogram is frozen. We need to
2459 -- do this before analyzing the protected subprogram's body so that any
2460 -- references to the original subprogram's extra formals will be changed
2461 -- refer to the implementing subprogram's formals (see Expand_Formal).
2463 if Present
(Spec_Id
)
2464 and then Is_Protected_Type
(Scope
(Spec_Id
))
2465 and then Present
(Protected_Body_Subprogram
(Spec_Id
))
2468 Impl_Subp
: constant Entity_Id
:=
2469 Protected_Body_Subprogram
(Spec_Id
);
2470 Prot_Ext_Formal
: Entity_Id
:= Extra_Formals
(Spec_Id
);
2471 Impl_Ext_Formal
: Entity_Id
:= Extra_Formals
(Impl_Subp
);
2473 while Present
(Prot_Ext_Formal
) loop
2474 pragma Assert
(Present
(Impl_Ext_Formal
));
2475 Set_Protected_Formal
(Prot_Ext_Formal
, Impl_Ext_Formal
);
2476 Next_Formal_With_Extras
(Prot_Ext_Formal
);
2477 Next_Formal_With_Extras
(Impl_Ext_Formal
);
2482 -- Now we can go on to analyze the body
2484 HSS
:= Handled_Statement_Sequence
(N
);
2485 Set_Actual_Subtypes
(N
, Current_Scope
);
2487 -- Deal with preconditions and postconditions
2489 Process_PPCs
(N
, Spec_Id
, Body_Id
);
2491 -- Add a declaration for the Protection object, renaming declarations
2492 -- for discriminals and privals and finally a declaration for the entry
2493 -- family index (if applicable). This form of early expansion is done
2494 -- when the Expander is active because Install_Private_Data_Declarations
2495 -- references entities which were created during regular expansion.
2498 and then Comes_From_Source
(N
)
2499 and then Present
(Prot_Typ
)
2500 and then Present
(Spec_Id
)
2501 and then not Is_Eliminated
(Spec_Id
)
2503 Install_Private_Data_Declarations
2504 (Sloc
(N
), Spec_Id
, Prot_Typ
, N
, Declarations
(N
));
2507 -- Analyze the declarations (this call will analyze the precondition
2508 -- Check pragmas we prepended to the list, as well as the declaration
2509 -- of the _Postconditions procedure).
2511 Analyze_Declarations
(Declarations
(N
));
2513 -- Check completion, and analyze the statements
2516 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
2519 -- Deal with end of scope processing for the body
2521 Process_End_Label
(HSS
, 't', Current_Scope
);
2523 Check_Subprogram_Order
(N
);
2524 Set_Analyzed
(Body_Id
);
2526 -- If we have a separate spec, then the analysis of the declarations
2527 -- caused the entities in the body to be chained to the spec id, but
2528 -- we want them chained to the body id. Only the formal parameters
2529 -- end up chained to the spec id in this case.
2531 if Present
(Spec_Id
) then
2533 -- We must conform to the categorization of our spec
2535 Validate_Categorization_Dependency
(N
, Spec_Id
);
2537 -- And if this is a child unit, the parent units must conform
2539 if Is_Child_Unit
(Spec_Id
) then
2540 Validate_Categorization_Dependency
2541 (Unit_Declaration_Node
(Spec_Id
), Spec_Id
);
2544 -- Here is where we move entities from the spec to the body
2546 -- Case where there are entities that stay with the spec
2548 if Present
(Last_Real_Spec_Entity
) then
2550 -- No body entities (happens when the only real spec entities
2551 -- come from precondition and postcondition pragmas)
2553 if No
(Last_Entity
(Body_Id
)) then
2555 (Body_Id
, Next_Entity
(Last_Real_Spec_Entity
));
2557 -- Body entities present (formals), so chain stuff past them
2561 (Last_Entity
(Body_Id
), Next_Entity
(Last_Real_Spec_Entity
));
2564 Set_Next_Entity
(Last_Real_Spec_Entity
, Empty
);
2565 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2566 Set_Last_Entity
(Spec_Id
, Last_Real_Spec_Entity
);
2568 -- Case where there are no spec entities, in this case there can
2569 -- be no body entities either, so just move everything.
2572 pragma Assert
(No
(Last_Entity
(Body_Id
)));
2573 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
2574 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
2575 Set_First_Entity
(Spec_Id
, Empty
);
2576 Set_Last_Entity
(Spec_Id
, Empty
);
2580 Check_Missing_Return
;
2582 -- Now we are going to check for variables that are never modified in
2583 -- the body of the procedure. But first we deal with a special case
2584 -- where we want to modify this check. If the body of the subprogram
2585 -- starts with a raise statement or its equivalent, or if the body
2586 -- consists entirely of a null statement, then it is pretty obvious
2587 -- that it is OK to not reference the parameters. For example, this
2588 -- might be the following common idiom for a stubbed function:
2589 -- statement of the procedure raises an exception. In particular this
2590 -- deals with the common idiom of a stubbed function, which might
2591 -- appear as something like
2593 -- function F (A : Integer) return Some_Type;
2596 -- raise Program_Error;
2600 -- Here the purpose of X is simply to satisfy the annoying requirement
2601 -- in Ada that there be at least one return, and we certainly do not
2602 -- want to go posting warnings on X that it is not initialized! On
2603 -- the other hand, if X is entirely unreferenced that should still
2606 -- What we do is to detect these cases, and if we find them, flag the
2607 -- subprogram as being Is_Trivial_Subprogram and then use that flag to
2608 -- suppress unwanted warnings. For the case of the function stub above
2609 -- we have a special test to set X as apparently assigned to suppress
2616 -- Skip initial labels (for one thing this occurs when we are in
2617 -- front end ZCX mode, but in any case it is irrelevant), and also
2618 -- initial Push_xxx_Error_Label nodes, which are also irrelevant.
2620 Stm
:= First
(Statements
(HSS
));
2621 while Nkind
(Stm
) = N_Label
2622 or else Nkind
(Stm
) in N_Push_xxx_Label
2627 -- Do the test on the original statement before expansion
2630 Ostm
: constant Node_Id
:= Original_Node
(Stm
);
2633 -- If explicit raise statement, turn on flag
2635 if Nkind
(Ostm
) = N_Raise_Statement
then
2636 Set_Trivial_Subprogram
(Stm
);
2638 -- If null statement, and no following statements, turn on flag
2640 elsif Nkind
(Stm
) = N_Null_Statement
2641 and then Comes_From_Source
(Stm
)
2642 and then No
(Next
(Stm
))
2644 Set_Trivial_Subprogram
(Stm
);
2646 -- Check for explicit call cases which likely raise an exception
2648 elsif Nkind
(Ostm
) = N_Procedure_Call_Statement
then
2649 if Is_Entity_Name
(Name
(Ostm
)) then
2651 Ent
: constant Entity_Id
:= Entity
(Name
(Ostm
));
2654 -- If the procedure is marked No_Return, then likely it
2655 -- raises an exception, but in any case it is not coming
2656 -- back here, so turn on the flag.
2658 if Ekind
(Ent
) = E_Procedure
2659 and then No_Return
(Ent
)
2661 Set_Trivial_Subprogram
(Stm
);
2669 -- Check for variables that are never modified
2675 -- If there is a separate spec, then transfer Never_Set_In_Source
2676 -- flags from out parameters to the corresponding entities in the
2677 -- body. The reason we do that is we want to post error flags on
2678 -- the body entities, not the spec entities.
2680 if Present
(Spec_Id
) then
2681 E1
:= First_Entity
(Spec_Id
);
2682 while Present
(E1
) loop
2683 if Ekind
(E1
) = E_Out_Parameter
then
2684 E2
:= First_Entity
(Body_Id
);
2685 while Present
(E2
) loop
2686 exit when Chars
(E1
) = Chars
(E2
);
2690 if Present
(E2
) then
2691 Set_Never_Set_In_Source
(E2
, Never_Set_In_Source
(E1
));
2699 -- Check references in body unless it was deleted. Note that the
2700 -- check of Body_Deleted here is not just for efficiency, it is
2701 -- necessary to avoid junk warnings on formal parameters.
2703 if not Body_Deleted
then
2704 Check_References
(Body_Id
);
2707 end Analyze_Subprogram_Body_Helper
;
2709 ------------------------------------
2710 -- Analyze_Subprogram_Declaration --
2711 ------------------------------------
2713 procedure Analyze_Subprogram_Declaration
(N
: Node_Id
) is
2714 Loc
: constant Source_Ptr
:= Sloc
(N
);
2715 Scop
: constant Entity_Id
:= Current_Scope
;
2716 Designator
: Entity_Id
;
2718 Null_Body
: Node_Id
:= Empty
;
2720 -- Start of processing for Analyze_Subprogram_Declaration
2723 -- For a null procedure, capture the profile before analysis, for
2724 -- expansion at the freeze point and at each point of call. The body
2725 -- will only be used if the procedure has preconditions. In that case
2726 -- the body is analyzed at the freeze point.
2728 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2729 and then Null_Present
(Specification
(N
))
2730 and then Expander_Active
2733 Make_Subprogram_Body
(Loc
,
2735 New_Copy_Tree
(Specification
(N
)),
2738 Handled_Statement_Sequence
=>
2739 Make_Handled_Sequence_Of_Statements
(Loc
,
2740 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
2742 -- Create new entities for body and formals
2744 Set_Defining_Unit_Name
(Specification
(Null_Body
),
2745 Make_Defining_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2746 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
2748 Form
:= First
(Parameter_Specifications
(Specification
(Null_Body
)));
2749 while Present
(Form
) loop
2750 Set_Defining_Identifier
(Form
,
2751 Make_Defining_Identifier
(Loc
,
2752 Chars
(Defining_Identifier
(Form
))));
2754 -- Resolve the types of the formals now, because the freeze point
2755 -- may appear in a different context, e.g. an instantiation.
2757 if Nkind
(Parameter_Type
(Form
)) /= N_Access_Definition
then
2758 Find_Type
(Parameter_Type
(Form
));
2761 No
(Access_To_Subprogram_Definition
(Parameter_Type
(Form
)))
2763 Find_Type
(Subtype_Mark
(Parameter_Type
(Form
)));
2767 -- the case of a null procedure with a formal that is an
2768 -- access_to_subprogram type, and that is used as an actual
2769 -- in an instantiation is left to the enthusiastic reader.
2777 if Is_Protected_Type
(Current_Scope
) then
2778 Error_Msg_N
("protected operation cannot be a null procedure", N
);
2782 Designator
:= Analyze_Subprogram_Specification
(Specification
(N
));
2783 Generate_Definition
(Designator
);
2785 if Debug_Flag_C
then
2786 Write_Str
("==> subprogram spec ");
2787 Write_Name
(Chars
(Designator
));
2788 Write_Str
(" from ");
2789 Write_Location
(Sloc
(N
));
2794 if Nkind
(Specification
(N
)) = N_Procedure_Specification
2795 and then Null_Present
(Specification
(N
))
2797 Set_Has_Completion
(Designator
);
2799 if Present
(Null_Body
) then
2800 Set_Corresponding_Body
(N
, Defining_Entity
(Null_Body
));
2801 Set_Body_To_Inline
(N
, Null_Body
);
2802 Set_Is_Inlined
(Designator
);
2806 Validate_RCI_Subprogram_Declaration
(N
);
2807 New_Overloaded_Entity
(Designator
);
2808 Check_Delayed_Subprogram
(Designator
);
2810 -- If the type of the first formal of the current subprogram is a
2811 -- nongeneric tagged private type, mark the subprogram as being a
2812 -- private primitive. Ditto if this is a function with controlling
2813 -- result, and the return type is currently private. In both cases,
2814 -- the type of the controlling argument or result must be in the
2815 -- current scope for the operation to be primitive.
2817 if Has_Controlling_Result
(Designator
)
2818 and then Is_Private_Type
(Etype
(Designator
))
2819 and then Scope
(Etype
(Designator
)) = Current_Scope
2820 and then not Is_Generic_Actual_Type
(Etype
(Designator
))
2822 Set_Is_Private_Primitive
(Designator
);
2824 elsif Present
(First_Formal
(Designator
)) then
2826 Formal_Typ
: constant Entity_Id
:=
2827 Etype
(First_Formal
(Designator
));
2829 Set_Is_Private_Primitive
(Designator
,
2830 Is_Tagged_Type
(Formal_Typ
)
2831 and then Scope
(Formal_Typ
) = Current_Scope
2832 and then Is_Private_Type
(Formal_Typ
)
2833 and then not Is_Generic_Actual_Type
(Formal_Typ
));
2837 -- Ada 2005 (AI-251): Abstract interface primitives must be abstract
2840 if Ada_Version
>= Ada_2005
2841 and then Comes_From_Source
(N
)
2842 and then Is_Dispatching_Operation
(Designator
)
2849 if Has_Controlling_Result
(Designator
) then
2850 Etyp
:= Etype
(Designator
);
2853 E
:= First_Entity
(Designator
);
2855 and then Is_Formal
(E
)
2856 and then not Is_Controlling_Formal
(E
)
2864 if Is_Access_Type
(Etyp
) then
2865 Etyp
:= Directly_Designated_Type
(Etyp
);
2868 if Is_Interface
(Etyp
)
2869 and then not Is_Abstract_Subprogram
(Designator
)
2870 and then not (Ekind
(Designator
) = E_Procedure
2871 and then Null_Present
(Specification
(N
)))
2873 Error_Msg_Name_1
:= Chars
(Defining_Entity
(N
));
2875 ("(Ada 2005) interface subprogram % must be abstract or null",
2881 -- What is the following code for, it used to be
2883 -- ??? Set_Suppress_Elaboration_Checks
2884 -- ??? (Designator, Elaboration_Checks_Suppressed (Designator));
2886 -- The following seems equivalent, but a bit dubious
2888 if Elaboration_Checks_Suppressed
(Designator
) then
2889 Set_Kill_Elaboration_Checks
(Designator
);
2892 if Scop
/= Standard_Standard
2893 and then not Is_Child_Unit
(Designator
)
2895 Set_Categorization_From_Scope
(Designator
, Scop
);
2897 -- For a compilation unit, check for library-unit pragmas
2899 Push_Scope
(Designator
);
2900 Set_Categorization_From_Pragmas
(N
);
2901 Validate_Categorization_Dependency
(N
, Designator
);
2905 -- For a compilation unit, set body required. This flag will only be
2906 -- reset if a valid Import or Interface pragma is processed later on.
2908 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2909 Set_Body_Required
(Parent
(N
), True);
2911 if Ada_Version
>= Ada_2005
2912 and then Nkind
(Specification
(N
)) = N_Procedure_Specification
2913 and then Null_Present
(Specification
(N
))
2916 ("null procedure cannot be declared at library level", N
);
2920 Generate_Reference_To_Formals
(Designator
);
2921 Check_Eliminated
(Designator
);
2923 if Debug_Flag_C
then
2925 Write_Str
("<== subprogram spec ");
2926 Write_Name
(Chars
(Designator
));
2927 Write_Str
(" from ");
2928 Write_Location
(Sloc
(N
));
2932 List_Inherited_Pre_Post_Aspects
(Designator
);
2933 Analyze_Aspect_Specifications
(N
, Designator
, Aspect_Specifications
(N
));
2934 end Analyze_Subprogram_Declaration
;
2936 --------------------------------------
2937 -- Analyze_Subprogram_Specification --
2938 --------------------------------------
2940 -- Reminder: N here really is a subprogram specification (not a subprogram
2941 -- declaration). This procedure is called to analyze the specification in
2942 -- both subprogram bodies and subprogram declarations (specs).
2944 function Analyze_Subprogram_Specification
(N
: Node_Id
) return Entity_Id
is
2945 Designator
: constant Entity_Id
:= Defining_Entity
(N
);
2946 Formals
: constant List_Id
:= Parameter_Specifications
(N
);
2948 -- Start of processing for Analyze_Subprogram_Specification
2951 Generate_Definition
(Designator
);
2953 if Nkind
(N
) = N_Function_Specification
then
2954 Set_Ekind
(Designator
, E_Function
);
2955 Set_Mechanism
(Designator
, Default_Mechanism
);
2957 Set_Ekind
(Designator
, E_Procedure
);
2958 Set_Etype
(Designator
, Standard_Void_Type
);
2961 -- Introduce new scope for analysis of the formals and the return type
2963 Set_Scope
(Designator
, Current_Scope
);
2965 if Present
(Formals
) then
2966 Push_Scope
(Designator
);
2967 Process_Formals
(Formals
, N
);
2969 -- Ada 2005 (AI-345): If this is an overriding operation of an
2970 -- inherited interface operation, and the controlling type is
2971 -- a synchronized type, replace the type with its corresponding
2972 -- record, to match the proper signature of an overriding operation.
2973 -- Same processing for an access parameter whose designated type is
2974 -- derived from a synchronized interface.
2976 if Ada_Version
>= Ada_2005
then
2979 Formal_Typ
: Entity_Id
;
2980 Rec_Typ
: Entity_Id
;
2981 Desig_Typ
: Entity_Id
;
2984 Formal
:= First_Formal
(Designator
);
2985 while Present
(Formal
) loop
2986 Formal_Typ
:= Etype
(Formal
);
2988 if Is_Concurrent_Type
(Formal_Typ
)
2989 and then Present
(Corresponding_Record_Type
(Formal_Typ
))
2991 Rec_Typ
:= Corresponding_Record_Type
(Formal_Typ
);
2993 if Present
(Interfaces
(Rec_Typ
)) then
2994 Set_Etype
(Formal
, Rec_Typ
);
2997 elsif Ekind
(Formal_Typ
) = E_Anonymous_Access_Type
then
2998 Desig_Typ
:= Designated_Type
(Formal_Typ
);
3000 if Is_Concurrent_Type
(Desig_Typ
)
3001 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
3003 Rec_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
3005 if Present
(Interfaces
(Rec_Typ
)) then
3006 Set_Directly_Designated_Type
(Formal_Typ
, Rec_Typ
);
3011 Next_Formal
(Formal
);
3018 -- The subprogram scope is pushed and popped around the processing of
3019 -- the return type for consistency with call above to Process_Formals
3020 -- (which itself can call Analyze_Return_Type), and to ensure that any
3021 -- itype created for the return type will be associated with the proper
3024 elsif Nkind
(N
) = N_Function_Specification
then
3025 Push_Scope
(Designator
);
3026 Analyze_Return_Type
(N
);
3032 if Nkind
(N
) = N_Function_Specification
then
3034 -- Deal with operator symbol case
3036 if Nkind
(Designator
) = N_Defining_Operator_Symbol
then
3037 Valid_Operator_Definition
(Designator
);
3040 May_Need_Actuals
(Designator
);
3042 -- Ada 2005 (AI-251): If the return type is abstract, verify that
3043 -- the subprogram is abstract also. This does not apply to renaming
3044 -- declarations, where abstractness is inherited.
3046 -- In case of primitives associated with abstract interface types
3047 -- the check is applied later (see Analyze_Subprogram_Declaration).
3049 if not Nkind_In
(Parent
(N
), N_Subprogram_Renaming_Declaration
,
3050 N_Abstract_Subprogram_Declaration
,
3051 N_Formal_Abstract_Subprogram_Declaration
)
3053 if Is_Abstract_Type
(Etype
(Designator
))
3054 and then not Is_Interface
(Etype
(Designator
))
3057 ("function that returns abstract type must be abstract", N
);
3059 -- Ada 2012 (AI-0073): Extend this test to subprograms with an
3060 -- access result whose designated type is abstract.
3062 elsif Nkind
(Result_Definition
(N
)) = N_Access_Definition
3064 not Is_Class_Wide_Type
(Designated_Type
(Etype
(Designator
)))
3065 and then Is_Abstract_Type
(Designated_Type
(Etype
(Designator
)))
3066 and then Ada_Version
>= Ada_2012
3068 Error_Msg_N
("function whose access result designates "
3069 & "abstract type must be abstract", N
);
3075 end Analyze_Subprogram_Specification
;
3077 --------------------------
3078 -- Build_Body_To_Inline --
3079 --------------------------
3081 procedure Build_Body_To_Inline
(N
: Node_Id
; Subp
: Entity_Id
) is
3082 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
3083 Original_Body
: Node_Id
;
3084 Body_To_Analyze
: Node_Id
;
3085 Max_Size
: constant := 10;
3086 Stat_Count
: Integer := 0;
3088 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean;
3089 -- Check for declarations that make inlining not worthwhile
3091 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean;
3092 -- Check for statements that make inlining not worthwhile: any tasking
3093 -- statement, nested at any level. Keep track of total number of
3094 -- elementary statements, as a measure of acceptable size.
3096 function Has_Pending_Instantiation
return Boolean;
3097 -- If some enclosing body contains instantiations that appear before the
3098 -- corresponding generic body, the enclosing body has a freeze node so
3099 -- that it can be elaborated after the generic itself. This might
3100 -- conflict with subsequent inlinings, so that it is unsafe to try to
3101 -- inline in such a case.
3103 function Has_Single_Return
return Boolean;
3104 -- In general we cannot inline functions that return unconstrained type.
3105 -- However, we can handle such functions if all return statements return
3106 -- a local variable that is the only declaration in the body of the
3107 -- function. In that case the call can be replaced by that local
3108 -- variable as is done for other inlined calls.
3110 procedure Remove_Pragmas
;
3111 -- A pragma Unreferenced or pragma Unmodified that mentions a formal
3112 -- parameter has no meaning when the body is inlined and the formals
3113 -- are rewritten. Remove it from body to inline. The analysis of the
3114 -- non-inlined body will handle the pragma properly.
3116 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean;
3117 -- If the body of the subprogram includes a call that returns an
3118 -- unconstrained type, the secondary stack is involved, and it
3119 -- is not worth inlining.
3121 ------------------------------
3122 -- Has_Excluded_Declaration --
3123 ------------------------------
3125 function Has_Excluded_Declaration
(Decls
: List_Id
) return Boolean is
3128 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean;
3129 -- Nested subprograms make a given body ineligible for inlining, but
3130 -- we make an exception for instantiations of unchecked conversion.
3131 -- The body has not been analyzed yet, so check the name, and verify
3132 -- that the visible entity with that name is the predefined unit.
3134 -----------------------------
3135 -- Is_Unchecked_Conversion --
3136 -----------------------------
3138 function Is_Unchecked_Conversion
(D
: Node_Id
) return Boolean is
3139 Id
: constant Node_Id
:= Name
(D
);
3143 if Nkind
(Id
) = N_Identifier
3144 and then Chars
(Id
) = Name_Unchecked_Conversion
3146 Conv
:= Current_Entity
(Id
);
3148 elsif Nkind_In
(Id
, N_Selected_Component
, N_Expanded_Name
)
3149 and then Chars
(Selector_Name
(Id
)) = Name_Unchecked_Conversion
3151 Conv
:= Current_Entity
(Selector_Name
(Id
));
3156 return Present
(Conv
)
3157 and then Is_Predefined_File_Name
3158 (Unit_File_Name
(Get_Source_Unit
(Conv
)))
3159 and then Is_Intrinsic_Subprogram
(Conv
);
3160 end Is_Unchecked_Conversion
;
3162 -- Start of processing for Has_Excluded_Declaration
3166 while Present
(D
) loop
3167 if (Nkind
(D
) = N_Function_Instantiation
3168 and then not Is_Unchecked_Conversion
(D
))
3169 or else Nkind_In
(D
, N_Protected_Type_Declaration
,
3170 N_Package_Declaration
,
3171 N_Package_Instantiation
,
3173 N_Procedure_Instantiation
,
3174 N_Task_Type_Declaration
)
3177 ("cannot inline & (non-allowed declaration)?", D
, Subp
);
3185 end Has_Excluded_Declaration
;
3187 ----------------------------
3188 -- Has_Excluded_Statement --
3189 ----------------------------
3191 function Has_Excluded_Statement
(Stats
: List_Id
) return Boolean is
3197 while Present
(S
) loop
3198 Stat_Count
:= Stat_Count
+ 1;
3200 if Nkind_In
(S
, N_Abort_Statement
,
3201 N_Asynchronous_Select
,
3202 N_Conditional_Entry_Call
,
3203 N_Delay_Relative_Statement
,
3204 N_Delay_Until_Statement
,
3209 ("cannot inline & (non-allowed statement)?", S
, Subp
);
3212 elsif Nkind
(S
) = N_Block_Statement
then
3213 if Present
(Declarations
(S
))
3214 and then Has_Excluded_Declaration
(Declarations
(S
))
3218 elsif Present
(Handled_Statement_Sequence
(S
))
3221 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
3223 Has_Excluded_Statement
3224 (Statements
(Handled_Statement_Sequence
(S
))))
3229 elsif Nkind
(S
) = N_Case_Statement
then
3230 E
:= First
(Alternatives
(S
));
3231 while Present
(E
) loop
3232 if Has_Excluded_Statement
(Statements
(E
)) then
3239 elsif Nkind
(S
) = N_If_Statement
then
3240 if Has_Excluded_Statement
(Then_Statements
(S
)) then
3244 if Present
(Elsif_Parts
(S
)) then
3245 E
:= First
(Elsif_Parts
(S
));
3246 while Present
(E
) loop
3247 if Has_Excluded_Statement
(Then_Statements
(E
)) then
3254 if Present
(Else_Statements
(S
))
3255 and then Has_Excluded_Statement
(Else_Statements
(S
))
3260 elsif Nkind
(S
) = N_Loop_Statement
3261 and then Has_Excluded_Statement
(Statements
(S
))
3265 elsif Nkind
(S
) = N_Extended_Return_Statement
then
3266 if Has_Excluded_Statement
3267 (Statements
(Handled_Statement_Sequence
(S
)))
3269 (Exception_Handlers
(Handled_Statement_Sequence
(S
)))
3279 end Has_Excluded_Statement
;
3281 -------------------------------
3282 -- Has_Pending_Instantiation --
3283 -------------------------------
3285 function Has_Pending_Instantiation
return Boolean is
3290 while Present
(S
) loop
3291 if Is_Compilation_Unit
(S
)
3292 or else Is_Child_Unit
(S
)
3296 elsif Ekind
(S
) = E_Package
3297 and then Has_Forward_Instantiation
(S
)
3306 end Has_Pending_Instantiation
;
3308 ------------------------
3309 -- Has_Single_Return --
3310 ------------------------
3312 function Has_Single_Return
return Boolean is
3313 Return_Statement
: Node_Id
:= Empty
;
3315 function Check_Return
(N
: Node_Id
) return Traverse_Result
;
3321 function Check_Return
(N
: Node_Id
) return Traverse_Result
is
3323 if Nkind
(N
) = N_Simple_Return_Statement
then
3324 if Present
(Expression
(N
))
3325 and then Is_Entity_Name
(Expression
(N
))
3327 if No
(Return_Statement
) then
3328 Return_Statement
:= N
;
3331 elsif Chars
(Expression
(N
)) =
3332 Chars
(Expression
(Return_Statement
))
3340 -- A return statement within an extended return is a noop
3343 elsif No
(Expression
(N
))
3344 and then Nkind
(Parent
(Parent
(N
))) =
3345 N_Extended_Return_Statement
3350 -- Expression has wrong form
3355 -- We can only inline a build-in-place function if
3356 -- it has a single extended return.
3358 elsif Nkind
(N
) = N_Extended_Return_Statement
then
3359 if No
(Return_Statement
) then
3360 Return_Statement
:= N
;
3372 function Check_All_Returns
is new Traverse_Func
(Check_Return
);
3374 -- Start of processing for Has_Single_Return
3377 if Check_All_Returns
(N
) /= OK
then
3380 elsif Nkind
(Return_Statement
) = N_Extended_Return_Statement
then
3384 return Present
(Declarations
(N
))
3385 and then Present
(First
(Declarations
(N
)))
3386 and then Chars
(Expression
(Return_Statement
)) =
3387 Chars
(Defining_Identifier
(First
(Declarations
(N
))));
3389 end Has_Single_Return
;
3391 --------------------
3392 -- Remove_Pragmas --
3393 --------------------
3395 procedure Remove_Pragmas
is
3400 Decl
:= First
(Declarations
(Body_To_Analyze
));
3401 while Present
(Decl
) loop
3404 if Nkind
(Decl
) = N_Pragma
3405 and then (Pragma_Name
(Decl
) = Name_Unreferenced
3407 Pragma_Name
(Decl
) = Name_Unmodified
)
3416 --------------------------
3417 -- Uses_Secondary_Stack --
3418 --------------------------
3420 function Uses_Secondary_Stack
(Bod
: Node_Id
) return Boolean is
3421 function Check_Call
(N
: Node_Id
) return Traverse_Result
;
3422 -- Look for function calls that return an unconstrained type
3428 function Check_Call
(N
: Node_Id
) return Traverse_Result
is
3430 if Nkind
(N
) = N_Function_Call
3431 and then Is_Entity_Name
(Name
(N
))
3432 and then Is_Composite_Type
(Etype
(Entity
(Name
(N
))))
3433 and then not Is_Constrained
(Etype
(Entity
(Name
(N
))))
3436 ("cannot inline & (call returns unconstrained type)?",
3444 function Check_Calls
is new Traverse_Func
(Check_Call
);
3447 return Check_Calls
(Bod
) = Abandon
;
3448 end Uses_Secondary_Stack
;
3450 -- Start of processing for Build_Body_To_Inline
3453 -- Return immediately if done already
3455 if Nkind
(Decl
) = N_Subprogram_Declaration
3456 and then Present
(Body_To_Inline
(Decl
))
3460 -- Functions that return unconstrained composite types require
3461 -- secondary stack handling, and cannot currently be inlined, unless
3462 -- all return statements return a local variable that is the first
3463 -- local declaration in the body.
3465 elsif Ekind
(Subp
) = E_Function
3466 and then not Is_Scalar_Type
(Etype
(Subp
))
3467 and then not Is_Access_Type
(Etype
(Subp
))
3468 and then not Is_Constrained
(Etype
(Subp
))
3470 if not Has_Single_Return
then
3472 ("cannot inline & (unconstrained return type)?", N
, Subp
);
3476 -- Ditto for functions that return controlled types, where controlled
3477 -- actions interfere in complex ways with inlining.
3479 elsif Ekind
(Subp
) = E_Function
3480 and then Needs_Finalization
(Etype
(Subp
))
3483 ("cannot inline & (controlled return type)?", N
, Subp
);
3487 if Present
(Declarations
(N
))
3488 and then Has_Excluded_Declaration
(Declarations
(N
))
3493 if Present
(Handled_Statement_Sequence
(N
)) then
3494 if Present
(Exception_Handlers
(Handled_Statement_Sequence
(N
))) then
3496 ("cannot inline& (exception handler)?",
3497 First
(Exception_Handlers
(Handled_Statement_Sequence
(N
))),
3501 Has_Excluded_Statement
3502 (Statements
(Handled_Statement_Sequence
(N
)))
3508 -- We do not inline a subprogram that is too large, unless it is
3509 -- marked Inline_Always. This pragma does not suppress the other
3510 -- checks on inlining (forbidden declarations, handlers, etc).
3512 if Stat_Count
> Max_Size
3513 and then not Has_Pragma_Inline_Always
(Subp
)
3515 Cannot_Inline
("cannot inline& (body too large)?", N
, Subp
);
3519 if Has_Pending_Instantiation
then
3521 ("cannot inline& (forward instance within enclosing body)?",
3526 -- Within an instance, the body to inline must be treated as a nested
3527 -- generic, so that the proper global references are preserved.
3529 -- Note that we do not do this at the library level, because it is not
3530 -- needed, and furthermore this causes trouble if front end inlining
3531 -- is activated (-gnatN).
3533 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3534 Save_Env
(Scope
(Current_Scope
), Scope
(Current_Scope
));
3535 Original_Body
:= Copy_Generic_Node
(N
, Empty
, True);
3537 Original_Body
:= Copy_Separate_Tree
(N
);
3540 -- We need to capture references to the formals in order to substitute
3541 -- the actuals at the point of inlining, i.e. instantiation. To treat
3542 -- the formals as globals to the body to inline, we nest it within
3543 -- a dummy parameterless subprogram, declared within the real one.
3544 -- To avoid generating an internal name (which is never public, and
3545 -- which affects serial numbers of other generated names), we use
3546 -- an internal symbol that cannot conflict with user declarations.
3548 Set_Parameter_Specifications
(Specification
(Original_Body
), No_List
);
3549 Set_Defining_Unit_Name
3550 (Specification
(Original_Body
),
3551 Make_Defining_Identifier
(Sloc
(N
), Name_uParent
));
3552 Set_Corresponding_Spec
(Original_Body
, Empty
);
3554 Body_To_Analyze
:= Copy_Generic_Node
(Original_Body
, Empty
, False);
3556 -- Set return type of function, which is also global and does not need
3559 if Ekind
(Subp
) = E_Function
then
3560 Set_Result_Definition
(Specification
(Body_To_Analyze
),
3561 New_Occurrence_Of
(Etype
(Subp
), Sloc
(N
)));
3564 if No
(Declarations
(N
)) then
3565 Set_Declarations
(N
, New_List
(Body_To_Analyze
));
3567 Append
(Body_To_Analyze
, Declarations
(N
));
3570 Expander_Mode_Save_And_Set
(False);
3573 Analyze
(Body_To_Analyze
);
3574 Push_Scope
(Defining_Entity
(Body_To_Analyze
));
3575 Save_Global_References
(Original_Body
);
3577 Remove
(Body_To_Analyze
);
3579 Expander_Mode_Restore
;
3581 -- Restore environment if previously saved
3583 if In_Instance
and then Scope
(Current_Scope
) /= Standard_Standard
then
3587 -- If secondary stk used there is no point in inlining. We have
3588 -- already issued the warning in this case, so nothing to do.
3590 if Uses_Secondary_Stack
(Body_To_Analyze
) then
3594 Set_Body_To_Inline
(Decl
, Original_Body
);
3595 Set_Ekind
(Defining_Entity
(Original_Body
), Ekind
(Subp
));
3596 Set_Is_Inlined
(Subp
);
3597 end Build_Body_To_Inline
;
3603 procedure Cannot_Inline
(Msg
: String; N
: Node_Id
; Subp
: Entity_Id
) is
3605 -- Do not emit warning if this is a predefined unit which is not the
3606 -- main unit. With validity checks enabled, some predefined subprograms
3607 -- may contain nested subprograms and become ineligible for inlining.
3609 if Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(Subp
)))
3610 and then not In_Extended_Main_Source_Unit
(Subp
)
3614 elsif Has_Pragma_Inline_Always
(Subp
) then
3616 -- Remove last character (question mark) to make this into an error,
3617 -- because the Inline_Always pragma cannot be obeyed.
3619 Error_Msg_NE
(Msg
(Msg
'First .. Msg
'Last - 1), N
, Subp
);
3621 elsif Ineffective_Inline_Warnings
then
3622 Error_Msg_NE
(Msg
, N
, Subp
);
3626 -----------------------
3627 -- Check_Conformance --
3628 -----------------------
3630 procedure Check_Conformance
3631 (New_Id
: Entity_Id
;
3633 Ctype
: Conformance_Type
;
3635 Conforms
: out Boolean;
3636 Err_Loc
: Node_Id
:= Empty
;
3637 Get_Inst
: Boolean := False;
3638 Skip_Controlling_Formals
: Boolean := False)
3640 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
);
3641 -- Sets Conforms to False. If Errmsg is False, then that's all it does.
3642 -- If Errmsg is True, then processing continues to post an error message
3643 -- for conformance error on given node. Two messages are output. The
3644 -- first message points to the previous declaration with a general "no
3645 -- conformance" message. The second is the detailed reason, supplied as
3646 -- Msg. The parameter N provide information for a possible & insertion
3647 -- in the message, and also provides the location for posting the
3648 -- message in the absence of a specified Err_Loc location.
3650 -----------------------
3651 -- Conformance_Error --
3652 -----------------------
3654 procedure Conformance_Error
(Msg
: String; N
: Node_Id
:= New_Id
) is
3661 if No
(Err_Loc
) then
3667 Error_Msg_Sloc
:= Sloc
(Old_Id
);
3670 when Type_Conformant
=>
3671 Error_Msg_N
-- CODEFIX
3672 ("not type conformant with declaration#!", Enode
);
3674 when Mode_Conformant
=>
3675 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3677 ("not mode conformant with operation inherited#!",
3681 ("not mode conformant with declaration#!", Enode
);
3684 when Subtype_Conformant
=>
3685 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3687 ("not subtype conformant with operation inherited#!",
3691 ("not subtype conformant with declaration#!", Enode
);
3694 when Fully_Conformant
=>
3695 if Nkind
(Parent
(Old_Id
)) = N_Full_Type_Declaration
then
3696 Error_Msg_N
-- CODEFIX
3697 ("not fully conformant with operation inherited#!",
3700 Error_Msg_N
-- CODEFIX
3701 ("not fully conformant with declaration#!", Enode
);
3705 Error_Msg_NE
(Msg
, Enode
, N
);
3707 end Conformance_Error
;
3711 Old_Type
: constant Entity_Id
:= Etype
(Old_Id
);
3712 New_Type
: constant Entity_Id
:= Etype
(New_Id
);
3713 Old_Formal
: Entity_Id
;
3714 New_Formal
: Entity_Id
;
3715 Access_Types_Match
: Boolean;
3716 Old_Formal_Base
: Entity_Id
;
3717 New_Formal_Base
: Entity_Id
;
3719 -- Start of processing for Check_Conformance
3724 -- We need a special case for operators, since they don't appear
3727 if Ctype
= Type_Conformant
then
3728 if Ekind
(New_Id
) = E_Operator
3729 and then Operator_Matches_Spec
(New_Id
, Old_Id
)
3735 -- If both are functions/operators, check return types conform
3737 if Old_Type
/= Standard_Void_Type
3738 and then New_Type
/= Standard_Void_Type
3741 -- If we are checking interface conformance we omit controlling
3742 -- arguments and result, because we are only checking the conformance
3743 -- of the remaining parameters.
3745 if Has_Controlling_Result
(Old_Id
)
3746 and then Has_Controlling_Result
(New_Id
)
3747 and then Skip_Controlling_Formals
3751 elsif not Conforming_Types
(Old_Type
, New_Type
, Ctype
, Get_Inst
) then
3752 Conformance_Error
("\return type does not match!", New_Id
);
3756 -- Ada 2005 (AI-231): In case of anonymous access types check the
3757 -- null-exclusion and access-to-constant attributes match.
3759 if Ada_Version
>= Ada_2005
3760 and then Ekind
(Etype
(Old_Type
)) = E_Anonymous_Access_Type
3762 (Can_Never_Be_Null
(Old_Type
)
3763 /= Can_Never_Be_Null
(New_Type
)
3764 or else Is_Access_Constant
(Etype
(Old_Type
))
3765 /= Is_Access_Constant
(Etype
(New_Type
)))
3767 Conformance_Error
("\return type does not match!", New_Id
);
3771 -- If either is a function/operator and the other isn't, error
3773 elsif Old_Type
/= Standard_Void_Type
3774 or else New_Type
/= Standard_Void_Type
3776 Conformance_Error
("\functions can only match functions!", New_Id
);
3780 -- In subtype conformant case, conventions must match (RM 6.3.1(16)).
3781 -- If this is a renaming as body, refine error message to indicate that
3782 -- the conflict is with the original declaration. If the entity is not
3783 -- frozen, the conventions don't have to match, the one of the renamed
3784 -- entity is inherited.
3786 if Ctype
>= Subtype_Conformant
then
3787 if Convention
(Old_Id
) /= Convention
(New_Id
) then
3789 if not Is_Frozen
(New_Id
) then
3792 elsif Present
(Err_Loc
)
3793 and then Nkind
(Err_Loc
) = N_Subprogram_Renaming_Declaration
3794 and then Present
(Corresponding_Spec
(Err_Loc
))
3796 Error_Msg_Name_1
:= Chars
(New_Id
);
3798 Name_Ada
+ Convention_Id
'Pos (Convention
(New_Id
));
3799 Conformance_Error
("\prior declaration for% has convention %!");
3802 Conformance_Error
("\calling conventions do not match!");
3807 elsif Is_Formal_Subprogram
(Old_Id
)
3808 or else Is_Formal_Subprogram
(New_Id
)
3810 Conformance_Error
("\formal subprograms not allowed!");
3815 -- Deal with parameters
3817 -- Note: we use the entity information, rather than going directly
3818 -- to the specification in the tree. This is not only simpler, but
3819 -- absolutely necessary for some cases of conformance tests between
3820 -- operators, where the declaration tree simply does not exist!
3822 Old_Formal
:= First_Formal
(Old_Id
);
3823 New_Formal
:= First_Formal
(New_Id
);
3824 while Present
(Old_Formal
) and then Present
(New_Formal
) loop
3825 if Is_Controlling_Formal
(Old_Formal
)
3826 and then Is_Controlling_Formal
(New_Formal
)
3827 and then Skip_Controlling_Formals
3829 -- The controlling formals will have different types when
3830 -- comparing an interface operation with its match, but both
3831 -- or neither must be access parameters.
3833 if Is_Access_Type
(Etype
(Old_Formal
))
3835 Is_Access_Type
(Etype
(New_Formal
))
3837 goto Skip_Controlling_Formal
;
3840 ("\access parameter does not match!", New_Formal
);
3844 if Ctype
= Fully_Conformant
then
3846 -- Names must match. Error message is more accurate if we do
3847 -- this before checking that the types of the formals match.
3849 if Chars
(Old_Formal
) /= Chars
(New_Formal
) then
3850 Conformance_Error
("\name & does not match!", New_Formal
);
3852 -- Set error posted flag on new formal as well to stop
3853 -- junk cascaded messages in some cases.
3855 Set_Error_Posted
(New_Formal
);
3859 -- Null exclusion must match
3861 if Null_Exclusion_Present
(Parent
(Old_Formal
))
3863 Null_Exclusion_Present
(Parent
(New_Formal
))
3865 -- Only give error if both come from source. This should be
3866 -- investigated some time, since it should not be needed ???
3868 if Comes_From_Source
(Old_Formal
)
3870 Comes_From_Source
(New_Formal
)
3873 ("\null exclusion for & does not match", New_Formal
);
3875 -- Mark error posted on the new formal to avoid duplicated
3876 -- complaint about types not matching.
3878 Set_Error_Posted
(New_Formal
);
3883 -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This
3884 -- case occurs whenever a subprogram is being renamed and one of its
3885 -- parameters imposes a null exclusion. For example:
3887 -- type T is null record;
3888 -- type Acc_T is access T;
3889 -- subtype Acc_T_Sub is Acc_T;
3891 -- procedure P (Obj : not null Acc_T_Sub); -- itype
3892 -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype
3895 Old_Formal_Base
:= Etype
(Old_Formal
);
3896 New_Formal_Base
:= Etype
(New_Formal
);
3899 Old_Formal_Base
:= Get_Instance_Of
(Old_Formal_Base
);
3900 New_Formal_Base
:= Get_Instance_Of
(New_Formal_Base
);
3903 Access_Types_Match
:= Ada_Version
>= Ada_2005
3905 -- Ensure that this rule is only applied when New_Id is a
3906 -- renaming of Old_Id.
3908 and then Nkind
(Parent
(Parent
(New_Id
))) =
3909 N_Subprogram_Renaming_Declaration
3910 and then Nkind
(Name
(Parent
(Parent
(New_Id
)))) in N_Has_Entity
3911 and then Present
(Entity
(Name
(Parent
(Parent
(New_Id
)))))
3912 and then Entity
(Name
(Parent
(Parent
(New_Id
)))) = Old_Id
3914 -- Now handle the allowed access-type case
3916 and then Is_Access_Type
(Old_Formal_Base
)
3917 and then Is_Access_Type
(New_Formal_Base
)
3919 -- The type kinds must match. The only exception occurs with
3920 -- multiple generics of the form:
3923 -- type F is private; type A is private;
3924 -- type F_Ptr is access F; type A_Ptr is access A;
3925 -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr);
3926 -- package F_Pack is ... package A_Pack is
3927 -- package F_Inst is
3928 -- new F_Pack (A, A_Ptr, A_P);
3930 -- When checking for conformance between the parameters of A_P
3931 -- and F_P, the type kinds of F_Ptr and A_Ptr will not match
3932 -- because the compiler has transformed A_Ptr into a subtype of
3933 -- F_Ptr. We catch this case in the code below.
3935 and then (Ekind
(Old_Formal_Base
) = Ekind
(New_Formal_Base
)
3937 (Is_Generic_Type
(Old_Formal_Base
)
3938 and then Is_Generic_Type
(New_Formal_Base
)
3939 and then Is_Internal
(New_Formal_Base
)
3940 and then Etype
(Etype
(New_Formal_Base
)) =
3942 and then Directly_Designated_Type
(Old_Formal_Base
) =
3943 Directly_Designated_Type
(New_Formal_Base
)
3944 and then ((Is_Itype
(Old_Formal_Base
)
3945 and then Can_Never_Be_Null
(Old_Formal_Base
))
3947 (Is_Itype
(New_Formal_Base
)
3948 and then Can_Never_Be_Null
(New_Formal_Base
)));
3950 -- Types must always match. In the visible part of an instance,
3951 -- usual overloading rules for dispatching operations apply, and
3952 -- we check base types (not the actual subtypes).
3954 if In_Instance_Visible_Part
3955 and then Is_Dispatching_Operation
(New_Id
)
3957 if not Conforming_Types
3958 (T1
=> Base_Type
(Etype
(Old_Formal
)),
3959 T2
=> Base_Type
(Etype
(New_Formal
)),
3961 Get_Inst
=> Get_Inst
)
3962 and then not Access_Types_Match
3964 Conformance_Error
("\type of & does not match!", New_Formal
);
3968 elsif not Conforming_Types
3969 (T1
=> Old_Formal_Base
,
3970 T2
=> New_Formal_Base
,
3972 Get_Inst
=> Get_Inst
)
3973 and then not Access_Types_Match
3975 -- Don't give error message if old type is Any_Type. This test
3976 -- avoids some cascaded errors, e.g. in case of a bad spec.
3978 if Errmsg
and then Old_Formal_Base
= Any_Type
then
3981 Conformance_Error
("\type of & does not match!", New_Formal
);
3987 -- For mode conformance, mode must match
3989 if Ctype
>= Mode_Conformant
then
3990 if Parameter_Mode
(Old_Formal
) /= Parameter_Mode
(New_Formal
) then
3991 Conformance_Error
("\mode of & does not match!", New_Formal
);
3994 -- Part of mode conformance for access types is having the same
3995 -- constant modifier.
3997 elsif Access_Types_Match
3998 and then Is_Access_Constant
(Old_Formal_Base
) /=
3999 Is_Access_Constant
(New_Formal_Base
)
4002 ("\constant modifier does not match!", New_Formal
);
4007 if Ctype
>= Subtype_Conformant
then
4009 -- Ada 2005 (AI-231): In case of anonymous access types check
4010 -- the null-exclusion and access-to-constant attributes must
4013 if Ada_Version
>= Ada_2005
4014 and then Ekind
(Etype
(Old_Formal
)) = E_Anonymous_Access_Type
4015 and then Ekind
(Etype
(New_Formal
)) = E_Anonymous_Access_Type
4017 (Can_Never_Be_Null
(Old_Formal
) /=
4018 Can_Never_Be_Null
(New_Formal
)
4020 Is_Access_Constant
(Etype
(Old_Formal
)) /=
4021 Is_Access_Constant
(Etype
(New_Formal
)))
4023 -- Do not complain if error already posted on New_Formal. This
4024 -- avoids some redundant error messages.
4026 and then not Error_Posted
(New_Formal
)
4028 -- It is allowed to omit the null-exclusion in case of stream
4029 -- attribute subprograms. We recognize stream subprograms
4030 -- through their TSS-generated suffix.
4033 TSS_Name
: constant TSS_Name_Type
:= Get_TSS_Name
(New_Id
);
4035 if TSS_Name
/= TSS_Stream_Read
4036 and then TSS_Name
/= TSS_Stream_Write
4037 and then TSS_Name
/= TSS_Stream_Input
4038 and then TSS_Name
/= TSS_Stream_Output
4041 ("\type of & does not match!", New_Formal
);
4048 -- Full conformance checks
4050 if Ctype
= Fully_Conformant
then
4052 -- We have checked already that names match
4054 if Parameter_Mode
(Old_Formal
) = E_In_Parameter
then
4056 -- Check default expressions for in parameters
4059 NewD
: constant Boolean :=
4060 Present
(Default_Value
(New_Formal
));
4061 OldD
: constant Boolean :=
4062 Present
(Default_Value
(Old_Formal
));
4064 if NewD
or OldD
then
4066 -- The old default value has been analyzed because the
4067 -- current full declaration will have frozen everything
4068 -- before. The new default value has not been analyzed,
4069 -- so analyze it now before we check for conformance.
4072 Push_Scope
(New_Id
);
4073 Preanalyze_Spec_Expression
4074 (Default_Value
(New_Formal
), Etype
(New_Formal
));
4078 if not (NewD
and OldD
)
4079 or else not Fully_Conformant_Expressions
4080 (Default_Value
(Old_Formal
),
4081 Default_Value
(New_Formal
))
4084 ("\default expression for & does not match!",
4093 -- A couple of special checks for Ada 83 mode. These checks are
4094 -- skipped if either entity is an operator in package Standard,
4095 -- or if either old or new instance is not from the source program.
4097 if Ada_Version
= Ada_83
4098 and then Sloc
(Old_Id
) > Standard_Location
4099 and then Sloc
(New_Id
) > Standard_Location
4100 and then Comes_From_Source
(Old_Id
)
4101 and then Comes_From_Source
(New_Id
)
4104 Old_Param
: constant Node_Id
:= Declaration_Node
(Old_Formal
);
4105 New_Param
: constant Node_Id
:= Declaration_Node
(New_Formal
);
4108 -- Explicit IN must be present or absent in both cases. This
4109 -- test is required only in the full conformance case.
4111 if In_Present
(Old_Param
) /= In_Present
(New_Param
)
4112 and then Ctype
= Fully_Conformant
4115 ("\(Ada 83) IN must appear in both declarations",
4120 -- Grouping (use of comma in param lists) must be the same
4121 -- This is where we catch a misconformance like:
4124 -- A : Integer; B : Integer
4126 -- which are represented identically in the tree except
4127 -- for the setting of the flags More_Ids and Prev_Ids.
4129 if More_Ids
(Old_Param
) /= More_Ids
(New_Param
)
4130 or else Prev_Ids
(Old_Param
) /= Prev_Ids
(New_Param
)
4133 ("\grouping of & does not match!", New_Formal
);
4139 -- This label is required when skipping controlling formals
4141 <<Skip_Controlling_Formal
>>
4143 Next_Formal
(Old_Formal
);
4144 Next_Formal
(New_Formal
);
4147 if Present
(Old_Formal
) then
4148 Conformance_Error
("\too few parameters!");
4151 elsif Present
(New_Formal
) then
4152 Conformance_Error
("\too many parameters!", New_Formal
);
4155 end Check_Conformance
;
4157 -----------------------
4158 -- Check_Conventions --
4159 -----------------------
4161 procedure Check_Conventions
(Typ
: Entity_Id
) is
4162 Ifaces_List
: Elist_Id
;
4164 procedure Check_Convention
(Op
: Entity_Id
);
4165 -- Verify that the convention of inherited dispatching operation Op is
4166 -- consistent among all subprograms it overrides. In order to minimize
4167 -- the search, Search_From is utilized to designate a specific point in
4168 -- the list rather than iterating over the whole list once more.
4170 ----------------------
4171 -- Check_Convention --
4172 ----------------------
4174 procedure Check_Convention
(Op
: Entity_Id
) is
4175 Iface_Elmt
: Elmt_Id
;
4176 Iface_Prim_Elmt
: Elmt_Id
;
4177 Iface_Prim
: Entity_Id
;
4180 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
4181 while Present
(Iface_Elmt
) loop
4183 First_Elmt
(Primitive_Operations
(Node
(Iface_Elmt
)));
4184 while Present
(Iface_Prim_Elmt
) loop
4185 Iface_Prim
:= Node
(Iface_Prim_Elmt
);
4187 if Is_Interface_Conformant
(Typ
, Iface_Prim
, Op
)
4188 and then Convention
(Iface_Prim
) /= Convention
(Op
)
4191 ("inconsistent conventions in primitive operations", Typ
);
4193 Error_Msg_Name_1
:= Chars
(Op
);
4194 Error_Msg_Name_2
:= Get_Convention_Name
(Convention
(Op
));
4195 Error_Msg_Sloc
:= Sloc
(Op
);
4197 if Comes_From_Source
(Op
) or else No
(Alias
(Op
)) then
4198 if not Present
(Overridden_Operation
(Op
)) then
4199 Error_Msg_N
("\\primitive % defined #", Typ
);
4202 ("\\overriding operation % with " &
4203 "convention % defined #", Typ
);
4206 else pragma Assert
(Present
(Alias
(Op
)));
4207 Error_Msg_Sloc
:= Sloc
(Alias
(Op
));
4209 ("\\inherited operation % with " &
4210 "convention % defined #", Typ
);
4213 Error_Msg_Name_1
:= Chars
(Op
);
4215 Get_Convention_Name
(Convention
(Iface_Prim
));
4216 Error_Msg_Sloc
:= Sloc
(Iface_Prim
);
4218 ("\\overridden operation % with " &
4219 "convention % defined #", Typ
);
4221 -- Avoid cascading errors
4226 Next_Elmt
(Iface_Prim_Elmt
);
4229 Next_Elmt
(Iface_Elmt
);
4231 end Check_Convention
;
4235 Prim_Op
: Entity_Id
;
4236 Prim_Op_Elmt
: Elmt_Id
;
4238 -- Start of processing for Check_Conventions
4241 if not Has_Interfaces
(Typ
) then
4245 Collect_Interfaces
(Typ
, Ifaces_List
);
4247 -- The algorithm checks every overriding dispatching operation against
4248 -- all the corresponding overridden dispatching operations, detecting
4249 -- differences in conventions.
4251 Prim_Op_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
4252 while Present
(Prim_Op_Elmt
) loop
4253 Prim_Op
:= Node
(Prim_Op_Elmt
);
4255 -- A small optimization: skip the predefined dispatching operations
4256 -- since they always have the same convention.
4258 if not Is_Predefined_Dispatching_Operation
(Prim_Op
) then
4259 Check_Convention
(Prim_Op
);
4262 Next_Elmt
(Prim_Op_Elmt
);
4264 end Check_Conventions
;
4266 ------------------------------
4267 -- Check_Delayed_Subprogram --
4268 ------------------------------
4270 procedure Check_Delayed_Subprogram
(Designator
: Entity_Id
) is
4273 procedure Possible_Freeze
(T
: Entity_Id
);
4274 -- T is the type of either a formal parameter or of the return type.
4275 -- If T is not yet frozen and needs a delayed freeze, then the
4276 -- subprogram itself must be delayed. If T is the limited view of an
4277 -- incomplete type the subprogram must be frozen as well, because
4278 -- T may depend on local types that have not been frozen yet.
4280 ---------------------
4281 -- Possible_Freeze --
4282 ---------------------
4284 procedure Possible_Freeze
(T
: Entity_Id
) is
4286 if Has_Delayed_Freeze
(T
) and then not Is_Frozen
(T
) then
4287 Set_Has_Delayed_Freeze
(Designator
);
4289 elsif Is_Access_Type
(T
)
4290 and then Has_Delayed_Freeze
(Designated_Type
(T
))
4291 and then not Is_Frozen
(Designated_Type
(T
))
4293 Set_Has_Delayed_Freeze
(Designator
);
4295 elsif Ekind
(T
) = E_Incomplete_Type
and then From_With_Type
(T
) then
4296 Set_Has_Delayed_Freeze
(Designator
);
4299 end Possible_Freeze
;
4301 -- Start of processing for Check_Delayed_Subprogram
4304 -- All subprograms, including abstract subprograms, may need a freeze
4305 -- node if some formal type or the return type needs one.
4307 Possible_Freeze
(Etype
(Designator
));
4308 Possible_Freeze
(Base_Type
(Etype
(Designator
))); -- needed ???
4310 -- Need delayed freeze if any of the formal types themselves need
4311 -- a delayed freeze and are not yet frozen.
4313 F
:= First_Formal
(Designator
);
4314 while Present
(F
) loop
4315 Possible_Freeze
(Etype
(F
));
4316 Possible_Freeze
(Base_Type
(Etype
(F
))); -- needed ???
4320 -- Mark functions that return by reference. Note that it cannot be
4321 -- done for delayed_freeze subprograms because the underlying
4322 -- returned type may not be known yet (for private types)
4324 if not Has_Delayed_Freeze
(Designator
)
4325 and then Expander_Active
4328 Typ
: constant Entity_Id
:= Etype
(Designator
);
4329 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
4332 if Is_Immutably_Limited_Type
(Typ
) then
4333 Set_Returns_By_Ref
(Designator
);
4335 elsif Present
(Utyp
) and then CW_Or_Has_Controlled_Part
(Utyp
) then
4336 Set_Returns_By_Ref
(Designator
);
4340 end Check_Delayed_Subprogram
;
4342 ------------------------------------
4343 -- Check_Discriminant_Conformance --
4344 ------------------------------------
4346 procedure Check_Discriminant_Conformance
4351 Old_Discr
: Entity_Id
:= First_Discriminant
(Prev
);
4352 New_Discr
: Node_Id
:= First
(Discriminant_Specifications
(N
));
4353 New_Discr_Id
: Entity_Id
;
4354 New_Discr_Type
: Entity_Id
;
4356 procedure Conformance_Error
(Msg
: String; N
: Node_Id
);
4357 -- Post error message for conformance error on given node. Two messages
4358 -- are output. The first points to the previous declaration with a
4359 -- general "no conformance" message. The second is the detailed reason,
4360 -- supplied as Msg. The parameter N provide information for a possible
4361 -- & insertion in the message.
4363 -----------------------
4364 -- Conformance_Error --
4365 -----------------------
4367 procedure Conformance_Error
(Msg
: String; N
: Node_Id
) is
4369 Error_Msg_Sloc
:= Sloc
(Prev_Loc
);
4370 Error_Msg_N
-- CODEFIX
4371 ("not fully conformant with declaration#!", N
);
4372 Error_Msg_NE
(Msg
, N
, N
);
4373 end Conformance_Error
;
4375 -- Start of processing for Check_Discriminant_Conformance
4378 while Present
(Old_Discr
) and then Present
(New_Discr
) loop
4380 New_Discr_Id
:= Defining_Identifier
(New_Discr
);
4382 -- The subtype mark of the discriminant on the full type has not
4383 -- been analyzed so we do it here. For an access discriminant a new
4386 if Nkind
(Discriminant_Type
(New_Discr
)) = N_Access_Definition
then
4388 Access_Definition
(N
, Discriminant_Type
(New_Discr
));
4391 Analyze
(Discriminant_Type
(New_Discr
));
4392 New_Discr_Type
:= Etype
(Discriminant_Type
(New_Discr
));
4394 -- Ada 2005: if the discriminant definition carries a null
4395 -- exclusion, create an itype to check properly for consistency
4396 -- with partial declaration.
4398 if Is_Access_Type
(New_Discr_Type
)
4399 and then Null_Exclusion_Present
(New_Discr
)
4402 Create_Null_Excluding_Itype
4403 (T
=> New_Discr_Type
,
4404 Related_Nod
=> New_Discr
,
4405 Scope_Id
=> Current_Scope
);
4409 if not Conforming_Types
4410 (Etype
(Old_Discr
), New_Discr_Type
, Fully_Conformant
)
4412 Conformance_Error
("type of & does not match!", New_Discr_Id
);
4415 -- Treat the new discriminant as an occurrence of the old one,
4416 -- for navigation purposes, and fill in some semantic
4417 -- information, for completeness.
4419 Generate_Reference
(Old_Discr
, New_Discr_Id
, 'r');
4420 Set_Etype
(New_Discr_Id
, Etype
(Old_Discr
));
4421 Set_Scope
(New_Discr_Id
, Scope
(Old_Discr
));
4426 if Chars
(Old_Discr
) /= Chars
(Defining_Identifier
(New_Discr
)) then
4427 Conformance_Error
("name & does not match!", New_Discr_Id
);
4431 -- Default expressions must match
4434 NewD
: constant Boolean :=
4435 Present
(Expression
(New_Discr
));
4436 OldD
: constant Boolean :=
4437 Present
(Expression
(Parent
(Old_Discr
)));
4440 if NewD
or OldD
then
4442 -- The old default value has been analyzed and expanded,
4443 -- because the current full declaration will have frozen
4444 -- everything before. The new default values have not been
4445 -- expanded, so expand now to check conformance.
4448 Preanalyze_Spec_Expression
4449 (Expression
(New_Discr
), New_Discr_Type
);
4452 if not (NewD
and OldD
)
4453 or else not Fully_Conformant_Expressions
4454 (Expression
(Parent
(Old_Discr
)),
4455 Expression
(New_Discr
))
4459 ("default expression for & does not match!",
4466 -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X)
4468 if Ada_Version
= Ada_83
then
4470 Old_Disc
: constant Node_Id
:= Declaration_Node
(Old_Discr
);
4473 -- Grouping (use of comma in param lists) must be the same
4474 -- This is where we catch a misconformance like:
4477 -- A : Integer; B : Integer
4479 -- which are represented identically in the tree except
4480 -- for the setting of the flags More_Ids and Prev_Ids.
4482 if More_Ids
(Old_Disc
) /= More_Ids
(New_Discr
)
4483 or else Prev_Ids
(Old_Disc
) /= Prev_Ids
(New_Discr
)
4486 ("grouping of & does not match!", New_Discr_Id
);
4492 Next_Discriminant
(Old_Discr
);
4496 if Present
(Old_Discr
) then
4497 Conformance_Error
("too few discriminants!", Defining_Identifier
(N
));
4500 elsif Present
(New_Discr
) then
4502 ("too many discriminants!", Defining_Identifier
(New_Discr
));
4505 end Check_Discriminant_Conformance
;
4507 ----------------------------
4508 -- Check_Fully_Conformant --
4509 ----------------------------
4511 procedure Check_Fully_Conformant
4512 (New_Id
: Entity_Id
;
4514 Err_Loc
: Node_Id
:= Empty
)
4517 pragma Warnings
(Off
, Result
);
4520 (New_Id
, Old_Id
, Fully_Conformant
, True, Result
, Err_Loc
);
4521 end Check_Fully_Conformant
;
4523 ---------------------------
4524 -- Check_Mode_Conformant --
4525 ---------------------------
4527 procedure Check_Mode_Conformant
4528 (New_Id
: Entity_Id
;
4530 Err_Loc
: Node_Id
:= Empty
;
4531 Get_Inst
: Boolean := False)
4534 pragma Warnings
(Off
, Result
);
4537 (New_Id
, Old_Id
, Mode_Conformant
, True, Result
, Err_Loc
, Get_Inst
);
4538 end Check_Mode_Conformant
;
4540 --------------------------------
4541 -- Check_Overriding_Indicator --
4542 --------------------------------
4544 procedure Check_Overriding_Indicator
4546 Overridden_Subp
: Entity_Id
;
4547 Is_Primitive
: Boolean)
4553 -- No overriding indicator for literals
4555 if Ekind
(Subp
) = E_Enumeration_Literal
then
4558 elsif Ekind
(Subp
) = E_Entry
then
4559 Decl
:= Parent
(Subp
);
4561 -- No point in analyzing a malformed operator
4563 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
4564 and then Error_Posted
(Subp
)
4569 Decl
:= Unit_Declaration_Node
(Subp
);
4572 if Nkind_In
(Decl
, N_Subprogram_Body
,
4573 N_Subprogram_Body_Stub
,
4574 N_Subprogram_Declaration
,
4575 N_Abstract_Subprogram_Declaration
,
4576 N_Subprogram_Renaming_Declaration
)
4578 Spec
:= Specification
(Decl
);
4580 elsif Nkind
(Decl
) = N_Entry_Declaration
then
4587 -- The overriding operation is type conformant with the overridden one,
4588 -- but the names of the formals are not required to match. If the names
4589 -- appear permuted in the overriding operation, this is a possible
4590 -- source of confusion that is worth diagnosing. Controlling formals
4591 -- often carry names that reflect the type, and it is not worthwhile
4592 -- requiring that their names match.
4594 if Present
(Overridden_Subp
)
4595 and then Nkind
(Subp
) /= N_Defining_Operator_Symbol
4602 Form1
:= First_Formal
(Subp
);
4603 Form2
:= First_Formal
(Overridden_Subp
);
4605 -- If the overriding operation is a synchronized operation, skip
4606 -- the first parameter of the overridden operation, which is
4607 -- implicit in the new one. If the operation is declared in the
4608 -- body it is not primitive and all formals must match.
4610 if Is_Concurrent_Type
(Scope
(Subp
))
4611 and then Is_Tagged_Type
(Scope
(Subp
))
4612 and then not Has_Completion
(Scope
(Subp
))
4614 Form2
:= Next_Formal
(Form2
);
4617 if Present
(Form1
) then
4618 Form1
:= Next_Formal
(Form1
);
4619 Form2
:= Next_Formal
(Form2
);
4622 while Present
(Form1
) loop
4623 if not Is_Controlling_Formal
(Form1
)
4624 and then Present
(Next_Formal
(Form2
))
4625 and then Chars
(Form1
) = Chars
(Next_Formal
(Form2
))
4627 Error_Msg_Node_2
:= Alias
(Overridden_Subp
);
4628 Error_Msg_Sloc
:= Sloc
(Error_Msg_Node_2
);
4630 ("& does not match corresponding formal of&#",
4635 Next_Formal
(Form1
);
4636 Next_Formal
(Form2
);
4641 -- If there is an overridden subprogram, then check that there is no
4642 -- "not overriding" indicator, and mark the subprogram as overriding.
4643 -- This is not done if the overridden subprogram is marked as hidden,
4644 -- which can occur for the case of inherited controlled operations
4645 -- (see Derive_Subprogram), unless the inherited subprogram's parent
4646 -- subprogram is not itself hidden. (Note: This condition could probably
4647 -- be simplified, leaving out the testing for the specific controlled
4648 -- cases, but it seems safer and clearer this way, and echoes similar
4649 -- special-case tests of this kind in other places.)
4651 if Present
(Overridden_Subp
)
4652 and then (not Is_Hidden
(Overridden_Subp
)
4654 ((Chars
(Overridden_Subp
) = Name_Initialize
4656 Chars
(Overridden_Subp
) = Name_Adjust
4658 Chars
(Overridden_Subp
) = Name_Finalize
)
4659 and then Present
(Alias
(Overridden_Subp
))
4660 and then not Is_Hidden
(Alias
(Overridden_Subp
))))
4662 if Must_Not_Override
(Spec
) then
4663 Error_Msg_Sloc
:= Sloc
(Overridden_Subp
);
4665 if Ekind
(Subp
) = E_Entry
then
4667 ("entry & overrides inherited operation #", Spec
, Subp
);
4670 ("subprogram & overrides inherited operation #", Spec
, Subp
);
4673 elsif Is_Subprogram
(Subp
) then
4674 if No
(Overridden_Operation
(Subp
)) then
4676 -- For entities generated by Derive_Subprograms the overridden
4677 -- operation is the inherited primitive (which is available
4678 -- through the attribute alias)
4680 if (Is_Dispatching_Operation
(Subp
)
4681 or else Is_Dispatching_Operation
(Overridden_Subp
))
4682 and then not Comes_From_Source
(Overridden_Subp
)
4683 and then Find_Dispatching_Type
(Overridden_Subp
) =
4684 Find_Dispatching_Type
(Subp
)
4685 and then Present
(Alias
(Overridden_Subp
))
4686 and then Comes_From_Source
(Alias
(Overridden_Subp
))
4688 Set_Overridden_Operation
(Subp
, Alias
(Overridden_Subp
));
4690 Set_Overridden_Operation
(Subp
, Overridden_Subp
);
4695 -- If primitive flag is set or this is a protected operation, then
4696 -- the operation is overriding at the point of its declaration, so
4697 -- warn if necessary. Otherwise it may have been declared before the
4698 -- operation it overrides and no check is required.
4701 and then not Must_Override
(Spec
)
4702 and then (Is_Primitive
4703 or else Ekind
(Scope
(Subp
)) = E_Protected_Type
)
4705 Style
.Missing_Overriding
(Decl
, Subp
);
4708 -- If Subp is an operator, it may override a predefined operation, if
4709 -- it is defined in the same scope as the type to which it applies.
4710 -- In that case Overridden_Subp is empty because of our implicit
4711 -- representation for predefined operators. We have to check whether the
4712 -- signature of Subp matches that of a predefined operator. Note that
4713 -- first argument provides the name of the operator, and the second
4714 -- argument the signature that may match that of a standard operation.
4715 -- If the indicator is overriding, then the operator must match a
4716 -- predefined signature, because we know already that there is no
4717 -- explicit overridden operation.
4719 elsif Nkind
(Subp
) = N_Defining_Operator_Symbol
then
4721 Typ
: constant Entity_Id
:=
4722 Base_Type
(Etype
(First_Formal
(Subp
)));
4724 Can_Override
: constant Boolean :=
4725 Operator_Matches_Spec
(Subp
, Subp
)
4726 and then Scope
(Subp
) = Scope
(Typ
)
4727 and then not Is_Class_Wide_Type
(Typ
);
4730 if Must_Not_Override
(Spec
) then
4732 -- If this is not a primitive or a protected subprogram, then
4733 -- "not overriding" is illegal.
4736 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4739 ("overriding indicator only allowed "
4740 & "if subprogram is primitive", Subp
);
4742 elsif Can_Override
then
4744 ("subprogram& overrides predefined operator ", Spec
, Subp
);
4747 elsif Must_Override
(Spec
) then
4748 if No
(Overridden_Operation
(Subp
))
4749 and then not Can_Override
4751 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4754 elsif not Error_Posted
(Subp
)
4755 and then Style_Check
4756 and then Can_Override
4758 not Is_Predefined_File_Name
4759 (Unit_File_Name
(Get_Source_Unit
(Subp
)))
4761 -- If style checks are enabled, indicate that the indicator is
4762 -- missing. However, at the point of declaration, the type of
4763 -- which this is a primitive operation may be private, in which
4764 -- case the indicator would be premature.
4766 if Has_Private_Declaration
(Etype
(Subp
))
4767 or else Has_Private_Declaration
(Etype
(First_Formal
(Subp
)))
4771 Style
.Missing_Overriding
(Decl
, Subp
);
4776 elsif Must_Override
(Spec
) then
4777 if Ekind
(Subp
) = E_Entry
then
4778 Error_Msg_NE
("entry & is not overriding", Spec
, Subp
);
4780 Error_Msg_NE
("subprogram & is not overriding", Spec
, Subp
);
4783 -- If the operation is marked "not overriding" and it's not primitive
4784 -- then an error is issued, unless this is an operation of a task or
4785 -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding"
4786 -- has been specified have already been checked above.
4788 elsif Must_Not_Override
(Spec
)
4789 and then not Is_Primitive
4790 and then Ekind
(Subp
) /= E_Entry
4791 and then Ekind
(Scope
(Subp
)) /= E_Protected_Type
4794 ("overriding indicator only allowed if subprogram is primitive",
4798 end Check_Overriding_Indicator
;
4804 -- Note: this procedure needs to know far too much about how the expander
4805 -- messes with exceptions. The use of the flag Exception_Junk and the
4806 -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers
4807 -- works, but is not very clean. It would be better if the expansion
4808 -- routines would leave Original_Node working nicely, and we could use
4809 -- Original_Node here to ignore all the peculiar expander messing ???
4811 procedure Check_Returns
4815 Proc
: Entity_Id
:= Empty
)
4819 procedure Check_Statement_Sequence
(L
: List_Id
);
4820 -- Internal recursive procedure to check a list of statements for proper
4821 -- termination by a return statement (or a transfer of control or a
4822 -- compound statement that is itself internally properly terminated).
4824 ------------------------------
4825 -- Check_Statement_Sequence --
4826 ------------------------------
4828 procedure Check_Statement_Sequence
(L
: List_Id
) is
4833 Raise_Exception_Call
: Boolean;
4834 -- Set True if statement sequence terminated by Raise_Exception call
4835 -- or a Reraise_Occurrence call.
4838 Raise_Exception_Call
:= False;
4840 -- Get last real statement
4842 Last_Stm
:= Last
(L
);
4844 -- Deal with digging out exception handler statement sequences that
4845 -- have been transformed by the local raise to goto optimization.
4846 -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this
4847 -- optimization has occurred, we are looking at something like:
4850 -- original stmts in block
4854 -- goto L1; | omitted if No_Exception_Propagation
4859 -- goto L3; -- skip handler when exception not raised
4861 -- <<L1>> -- target label for local exception
4875 -- and what we have to do is to dig out the estmts1 and estmts2
4876 -- sequences (which were the original sequences of statements in
4877 -- the exception handlers) and check them.
4879 if Nkind
(Last_Stm
) = N_Label
4880 and then Exception_Junk
(Last_Stm
)
4886 exit when Nkind
(Stm
) /= N_Block_Statement
;
4887 exit when not Exception_Junk
(Stm
);
4890 exit when Nkind
(Stm
) /= N_Label
;
4891 exit when not Exception_Junk
(Stm
);
4892 Check_Statement_Sequence
4893 (Statements
(Handled_Statement_Sequence
(Next
(Stm
))));
4898 exit when Nkind
(Stm
) /= N_Goto_Statement
;
4899 exit when not Exception_Junk
(Stm
);
4903 -- Don't count pragmas
4905 while Nkind
(Last_Stm
) = N_Pragma
4907 -- Don't count call to SS_Release (can happen after Raise_Exception)
4910 (Nkind
(Last_Stm
) = N_Procedure_Call_Statement
4912 Nkind
(Name
(Last_Stm
)) = N_Identifier
4914 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_SS_Release
))
4916 -- Don't count exception junk
4919 (Nkind_In
(Last_Stm
, N_Goto_Statement
,
4921 N_Object_Declaration
)
4922 and then Exception_Junk
(Last_Stm
))
4923 or else Nkind
(Last_Stm
) in N_Push_xxx_Label
4924 or else Nkind
(Last_Stm
) in N_Pop_xxx_Label
4929 -- Here we have the "real" last statement
4931 Kind
:= Nkind
(Last_Stm
);
4933 -- Transfer of control, OK. Note that in the No_Return procedure
4934 -- case, we already diagnosed any explicit return statements, so
4935 -- we can treat them as OK in this context.
4937 if Is_Transfer
(Last_Stm
) then
4940 -- Check cases of explicit non-indirect procedure calls
4942 elsif Kind
= N_Procedure_Call_Statement
4943 and then Is_Entity_Name
(Name
(Last_Stm
))
4945 -- Check call to Raise_Exception procedure which is treated
4946 -- specially, as is a call to Reraise_Occurrence.
4948 -- We suppress the warning in these cases since it is likely that
4949 -- the programmer really does not expect to deal with the case
4950 -- of Null_Occurrence, and thus would find a warning about a
4951 -- missing return curious, and raising Program_Error does not
4952 -- seem such a bad behavior if this does occur.
4954 -- Note that in the Ada 2005 case for Raise_Exception, the actual
4955 -- behavior will be to raise Constraint_Error (see AI-329).
4957 if Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Raise_Exception
)
4959 Is_RTE
(Entity
(Name
(Last_Stm
)), RE_Reraise_Occurrence
)
4961 Raise_Exception_Call
:= True;
4963 -- For Raise_Exception call, test first argument, if it is
4964 -- an attribute reference for a 'Identity call, then we know
4965 -- that the call cannot possibly return.
4968 Arg
: constant Node_Id
:=
4969 Original_Node
(First_Actual
(Last_Stm
));
4971 if Nkind
(Arg
) = N_Attribute_Reference
4972 and then Attribute_Name
(Arg
) = Name_Identity
4979 -- If statement, need to look inside if there is an else and check
4980 -- each constituent statement sequence for proper termination.
4982 elsif Kind
= N_If_Statement
4983 and then Present
(Else_Statements
(Last_Stm
))
4985 Check_Statement_Sequence
(Then_Statements
(Last_Stm
));
4986 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
4988 if Present
(Elsif_Parts
(Last_Stm
)) then
4990 Elsif_Part
: Node_Id
:= First
(Elsif_Parts
(Last_Stm
));
4993 while Present
(Elsif_Part
) loop
4994 Check_Statement_Sequence
(Then_Statements
(Elsif_Part
));
5002 -- Case statement, check each case for proper termination
5004 elsif Kind
= N_Case_Statement
then
5008 Case_Alt
:= First_Non_Pragma
(Alternatives
(Last_Stm
));
5009 while Present
(Case_Alt
) loop
5010 Check_Statement_Sequence
(Statements
(Case_Alt
));
5011 Next_Non_Pragma
(Case_Alt
);
5017 -- Block statement, check its handled sequence of statements
5019 elsif Kind
= N_Block_Statement
then
5025 (Handled_Statement_Sequence
(Last_Stm
), Mode
, Err1
);
5034 -- Loop statement. If there is an iteration scheme, we can definitely
5035 -- fall out of the loop. Similarly if there is an exit statement, we
5036 -- can fall out. In either case we need a following return.
5038 elsif Kind
= N_Loop_Statement
then
5039 if Present
(Iteration_Scheme
(Last_Stm
))
5040 or else Has_Exit
(Entity
(Identifier
(Last_Stm
)))
5044 -- A loop with no exit statement or iteration scheme is either
5045 -- an infinite loop, or it has some other exit (raise/return).
5046 -- In either case, no warning is required.
5052 -- Timed entry call, check entry call and delay alternatives
5054 -- Note: in expanded code, the timed entry call has been converted
5055 -- to a set of expanded statements on which the check will work
5056 -- correctly in any case.
5058 elsif Kind
= N_Timed_Entry_Call
then
5060 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
5061 DCA
: constant Node_Id
:= Delay_Alternative
(Last_Stm
);
5064 -- If statement sequence of entry call alternative is missing,
5065 -- then we can definitely fall through, and we post the error
5066 -- message on the entry call alternative itself.
5068 if No
(Statements
(ECA
)) then
5071 -- If statement sequence of delay alternative is missing, then
5072 -- we can definitely fall through, and we post the error
5073 -- message on the delay alternative itself.
5075 -- Note: if both ECA and DCA are missing the return, then we
5076 -- post only one message, should be enough to fix the bugs.
5077 -- If not we will get a message next time on the DCA when the
5080 elsif No
(Statements
(DCA
)) then
5083 -- Else check both statement sequences
5086 Check_Statement_Sequence
(Statements
(ECA
));
5087 Check_Statement_Sequence
(Statements
(DCA
));
5092 -- Conditional entry call, check entry call and else part
5094 -- Note: in expanded code, the conditional entry call has been
5095 -- converted to a set of expanded statements on which the check
5096 -- will work correctly in any case.
5098 elsif Kind
= N_Conditional_Entry_Call
then
5100 ECA
: constant Node_Id
:= Entry_Call_Alternative
(Last_Stm
);
5103 -- If statement sequence of entry call alternative is missing,
5104 -- then we can definitely fall through, and we post the error
5105 -- message on the entry call alternative itself.
5107 if No
(Statements
(ECA
)) then
5110 -- Else check statement sequence and else part
5113 Check_Statement_Sequence
(Statements
(ECA
));
5114 Check_Statement_Sequence
(Else_Statements
(Last_Stm
));
5120 -- If we fall through, issue appropriate message
5123 if not Raise_Exception_Call
then
5125 ("?RETURN statement missing following this statement!",
5128 ("\?Program_Error may be raised at run time!",
5132 -- Note: we set Err even though we have not issued a warning
5133 -- because we still have a case of a missing return. This is
5134 -- an extremely marginal case, probably will never be noticed
5135 -- but we might as well get it right.
5139 -- Otherwise we have the case of a procedure marked No_Return
5142 if not Raise_Exception_Call
then
5144 ("?implied return after this statement " &
5145 "will raise Program_Error",
5148 ("\?procedure & is marked as No_Return!",
5153 RE
: constant Node_Id
:=
5154 Make_Raise_Program_Error
(Sloc
(Last_Stm
),
5155 Reason
=> PE_Implicit_Return
);
5157 Insert_After
(Last_Stm
, RE
);
5161 end Check_Statement_Sequence
;
5163 -- Start of processing for Check_Returns
5167 Check_Statement_Sequence
(Statements
(HSS
));
5169 if Present
(Exception_Handlers
(HSS
)) then
5170 Handler
:= First_Non_Pragma
(Exception_Handlers
(HSS
));
5171 while Present
(Handler
) loop
5172 Check_Statement_Sequence
(Statements
(Handler
));
5173 Next_Non_Pragma
(Handler
);
5178 ----------------------------
5179 -- Check_Subprogram_Order --
5180 ----------------------------
5182 procedure Check_Subprogram_Order
(N
: Node_Id
) is
5184 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean;
5185 -- This is used to check if S1 > S2 in the sense required by this
5186 -- test, for example nameab < namec, but name2 < name10.
5188 -----------------------------
5189 -- Subprogram_Name_Greater --
5190 -----------------------------
5192 function Subprogram_Name_Greater
(S1
, S2
: String) return Boolean is
5197 -- Remove trailing numeric parts
5200 while S1
(L1
) in '0' .. '9' loop
5205 while S2
(L2
) in '0' .. '9' loop
5209 -- If non-numeric parts non-equal, that's decisive
5211 if S1
(S1
'First .. L1
) < S2
(S2
'First .. L2
) then
5214 elsif S1
(S1
'First .. L1
) > S2
(S2
'First .. L2
) then
5217 -- If non-numeric parts equal, compare suffixed numeric parts. Note
5218 -- that a missing suffix is treated as numeric zero in this test.
5222 while L1
< S1
'Last loop
5224 N1
:= N1
* 10 + Character'Pos (S1
(L1
)) - Character'Pos ('0');
5228 while L2
< S2
'Last loop
5230 N2
:= N2
* 10 + Character'Pos (S2
(L2
)) - Character'Pos ('0');
5235 end Subprogram_Name_Greater
;
5237 -- Start of processing for Check_Subprogram_Order
5240 -- Check body in alpha order if this is option
5243 and then Style_Check_Order_Subprograms
5244 and then Nkind
(N
) = N_Subprogram_Body
5245 and then Comes_From_Source
(N
)
5246 and then In_Extended_Main_Source_Unit
(N
)
5250 renames Scope_Stack
.Table
5251 (Scope_Stack
.Last
).Last_Subprogram_Name
;
5253 Body_Id
: constant Entity_Id
:=
5254 Defining_Entity
(Specification
(N
));
5257 Get_Decoded_Name_String
(Chars
(Body_Id
));
5260 if Subprogram_Name_Greater
5261 (LSN
.all, Name_Buffer
(1 .. Name_Len
))
5263 Style
.Subprogram_Not_In_Alpha_Order
(Body_Id
);
5269 LSN
:= new String'(Name_Buffer (1 .. Name_Len));
5272 end Check_Subprogram_Order;
5274 ------------------------------
5275 -- Check_Subtype_Conformant --
5276 ------------------------------
5278 procedure Check_Subtype_Conformant
5279 (New_Id : Entity_Id;
5281 Err_Loc : Node_Id := Empty;
5282 Skip_Controlling_Formals : Boolean := False)
5285 pragma Warnings (Off, Result);
5288 (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc,
5289 Skip_Controlling_Formals => Skip_Controlling_Formals);
5290 end Check_Subtype_Conformant;
5292 ---------------------------
5293 -- Check_Type_Conformant --
5294 ---------------------------
5296 procedure Check_Type_Conformant
5297 (New_Id : Entity_Id;
5299 Err_Loc : Node_Id := Empty)
5302 pragma Warnings (Off, Result);
5305 (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc);
5306 end Check_Type_Conformant;
5308 ----------------------
5309 -- Conforming_Types --
5310 ----------------------
5312 function Conforming_Types
5315 Ctype : Conformance_Type;
5316 Get_Inst : Boolean := False) return Boolean
5318 Type_1 : Entity_Id := T1;
5319 Type_2 : Entity_Id := T2;
5320 Are_Anonymous_Access_To_Subprogram_Types : Boolean := False;
5322 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean;
5323 -- If neither T1 nor T2 are generic actual types, or if they are in
5324 -- different scopes (e.g. parent and child instances), then verify that
5325 -- the base types are equal. Otherwise T1 and T2 must be on the same
5326 -- subtype chain. The whole purpose of this procedure is to prevent
5327 -- spurious ambiguities in an instantiation that may arise if two
5328 -- distinct generic types are instantiated with the same actual.
5330 function Find_Designated_Type (T : Entity_Id) return Entity_Id;
5331 -- An access parameter can designate an incomplete type. If the
5332 -- incomplete type is the limited view of a type from a limited_
5333 -- with_clause, check whether the non-limited view is available. If
5334 -- it is a (non-limited) incomplete type, get the full view.
5336 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean;
5337 -- Returns True if and only if either T1 denotes a limited view of T2
5338 -- or T2 denotes a limited view of T1. This can arise when the limited
5339 -- with view of a type is used in a subprogram declaration and the
5340 -- subprogram body is in the scope of a regular with clause for the
5341 -- same unit. In such a case, the two type entities can be considered
5342 -- identical for purposes of conformance checking.
5344 ----------------------
5345 -- Base_Types_Match --
5346 ----------------------
5348 function Base_Types_Match (T1, T2 : Entity_Id) return Boolean is
5353 elsif Base_Type (T1) = Base_Type (T2) then
5355 -- The following is too permissive. A more precise test should
5356 -- check that the generic actual is an ancestor subtype of the
5359 return not Is_Generic_Actual_Type (T1)
5360 or else not Is_Generic_Actual_Type (T2)
5361 or else Scope (T1) /= Scope (T2);
5366 end Base_Types_Match;
5368 --------------------------
5369 -- Find_Designated_Type --
5370 --------------------------
5372 function Find_Designated_Type (T : Entity_Id) return Entity_Id is
5376 Desig := Directly_Designated_Type (T);
5378 if Ekind (Desig) = E_Incomplete_Type then
5380 -- If regular incomplete type, get full view if available
5382 if Present (Full_View (Desig)) then
5383 Desig := Full_View (Desig);
5385 -- If limited view of a type, get non-limited view if available,
5386 -- and check again for a regular incomplete type.
5388 elsif Present (Non_Limited_View (Desig)) then
5389 Desig := Get_Full_View (Non_Limited_View (Desig));
5394 end Find_Designated_Type;
5396 -------------------------------
5397 -- Matches_Limited_With_View --
5398 -------------------------------
5400 function Matches_Limited_With_View (T1, T2 : Entity_Id) return Boolean is
5402 -- In some cases a type imported through a limited_with clause, and
5403 -- its nonlimited view are both visible, for example in an anonymous
5404 -- access-to-class-wide type in a formal. Both entities designate the
5407 if From_With_Type (T1)
5408 and then T2 = Available_View (T1)
5412 elsif From_With_Type (T2)
5413 and then T1 = Available_View (T2)
5420 end Matches_Limited_With_View;
5422 -- Start of processing for Conforming_Types
5425 -- The context is an instance association for a formal
5426 -- access-to-subprogram type; the formal parameter types require
5427 -- mapping because they may denote other formal parameters of the
5431 Type_1 := Get_Instance_Of (T1);
5432 Type_2 := Get_Instance_Of (T2);
5435 -- If one of the types is a view of the other introduced by a limited
5436 -- with clause, treat these as conforming for all purposes.
5438 if Matches_Limited_With_View (T1, T2) then
5441 elsif Base_Types_Match (Type_1, Type_2) then
5442 return Ctype <= Mode_Conformant
5443 or else Subtypes_Statically_Match (Type_1, Type_2);
5445 elsif Is_Incomplete_Or_Private_Type (Type_1)
5446 and then Present (Full_View (Type_1))
5447 and then Base_Types_Match (Full_View (Type_1), Type_2)
5449 return Ctype <= Mode_Conformant
5450 or else Subtypes_Statically_Match (Full_View (Type_1), Type_2);
5452 elsif Ekind (Type_2) = E_Incomplete_Type
5453 and then Present (Full_View (Type_2))
5454 and then Base_Types_Match (Type_1, Full_View (Type_2))
5456 return Ctype <= Mode_Conformant
5457 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5459 elsif Is_Private_Type (Type_2)
5460 and then In_Instance
5461 and then Present (Full_View (Type_2))
5462 and then Base_Types_Match (Type_1, Full_View (Type_2))
5464 return Ctype <= Mode_Conformant
5465 or else Subtypes_Statically_Match (Type_1, Full_View (Type_2));
5468 -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be
5469 -- treated recursively because they carry a signature.
5471 Are_Anonymous_Access_To_Subprogram_Types :=
5472 Ekind (Type_1) = Ekind (Type_2)
5474 (Ekind (Type_1) = E_Anonymous_Access_Subprogram_Type
5476 Ekind (Type_1) = E_Anonymous_Access_Protected_Subprogram_Type);
5478 -- Test anonymous access type case. For this case, static subtype
5479 -- matching is required for mode conformance (RM 6.3.1(15)). We check
5480 -- the base types because we may have built internal subtype entities
5481 -- to handle null-excluding types (see Process_Formals).
5483 if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type
5485 Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type)
5486 or else Are_Anonymous_Access_To_Subprogram_Types -- Ada 2005 (AI-254)
5489 Desig_1 : Entity_Id;
5490 Desig_2 : Entity_Id;
5493 -- In Ada2005, access constant indicators must match for
5494 -- subtype conformance.
5496 if Ada_Version >= Ada_2005
5497 and then Ctype >= Subtype_Conformant
5499 Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2)
5504 Desig_1 := Find_Designated_Type (Type_1);
5505 Desig_2 := Find_Designated_Type (Type_2);
5507 -- If the context is an instance association for a formal
5508 -- access-to-subprogram type; formal access parameter designated
5509 -- types require mapping because they may denote other formal
5510 -- parameters of the generic unit.
5513 Desig_1 := Get_Instance_Of (Desig_1);
5514 Desig_2 := Get_Instance_Of (Desig_2);
5517 -- It is possible for a Class_Wide_Type to be introduced for an
5518 -- incomplete type, in which case there is a separate class_ wide
5519 -- type for the full view. The types conform if their Etypes
5520 -- conform, i.e. one may be the full view of the other. This can
5521 -- only happen in the context of an access parameter, other uses
5522 -- of an incomplete Class_Wide_Type are illegal.
5524 if Is_Class_Wide_Type (Desig_1)
5526 Is_Class_Wide_Type (Desig_2)
5530 (Etype (Base_Type (Desig_1)),
5531 Etype (Base_Type (Desig_2)), Ctype);
5533 elsif Are_Anonymous_Access_To_Subprogram_Types then
5534 if Ada_Version < Ada_2005 then
5535 return Ctype = Type_Conformant
5537 Subtypes_Statically_Match (Desig_1, Desig_2);
5539 -- We must check the conformance of the signatures themselves
5543 Conformant : Boolean;
5546 (Desig_1, Desig_2, Ctype, False, Conformant);
5552 return Base_Type (Desig_1) = Base_Type (Desig_2)
5553 and then (Ctype = Type_Conformant
5555 Subtypes_Statically_Match (Desig_1, Desig_2));
5559 -- Otherwise definitely no match
5562 if ((Ekind (Type_1) = E_Anonymous_Access_Type
5563 and then Is_Access_Type (Type_2))
5564 or else (Ekind (Type_2) = E_Anonymous_Access_Type
5565 and then Is_Access_Type (Type_1)))
5568 (Designated_Type (Type_1), Designated_Type (Type_2), Ctype)
5570 May_Hide_Profile := True;
5575 end Conforming_Types;
5577 --------------------------
5578 -- Create_Extra_Formals --
5579 --------------------------
5581 procedure Create_Extra_Formals (E : Entity_Id) is
5583 First_Extra : Entity_Id := Empty;
5584 Last_Extra : Entity_Id;
5585 Formal_Type : Entity_Id;
5586 P_Formal : Entity_Id := Empty;
5588 function Add_Extra_Formal
5589 (Assoc_Entity : Entity_Id;
5592 Suffix : String) return Entity_Id;
5593 -- Add an extra formal to the current list of formals and extra formals.
5594 -- The extra formal is added to the end of the list of extra formals,
5595 -- and also returned as the result. These formals are always of mode IN.
5596 -- The new formal has the type Typ, is declared in Scope, and its name
5597 -- is given by a concatenation of the name of Assoc_Entity and Suffix.
5598 -- The following suffixes are currently used. They should not be changed
5599 -- without coordinating with CodePeer, which makes use of these to
5600 -- provide better messages.
5602 -- O denotes the Constrained bit.
5603 -- L denotes the accessibility level.
5604 -- BIP_xxx denotes an extra formal for a build-in-place function. See
5605 -- the full list in exp_ch6.BIP_Formal_Kind.
5607 ----------------------
5608 -- Add_Extra_Formal --
5609 ----------------------
5611 function Add_Extra_Formal
5612 (Assoc_Entity : Entity_Id;
5615 Suffix : String) return Entity_Id
5617 EF : constant Entity_Id :=
5618 Make_Defining_Identifier (Sloc (Assoc_Entity),
5619 Chars => New_External_Name (Chars (Assoc_Entity),
5623 -- A little optimization. Never generate an extra formal for the
5624 -- _init operand of an initialization procedure, since it could
5627 if Chars (Formal) = Name_uInit then
5631 Set_Ekind (EF, E_In_Parameter);
5632 Set_Actual_Subtype (EF, Typ);
5633 Set_Etype (EF, Typ);
5634 Set_Scope (EF, Scope);
5635 Set_Mechanism (EF, Default_Mechanism);
5636 Set_Formal_Validity (EF);
5638 if No (First_Extra) then
5640 Set_Extra_Formals (Scope, First_Extra);
5643 if Present (Last_Extra) then
5644 Set_Extra_Formal (Last_Extra, EF);
5650 end Add_Extra_Formal;
5652 -- Start of processing for Create_Extra_Formals
5655 -- We never generate extra formals if expansion is not active
5656 -- because we don't need them unless we are generating code.
5658 if not Expander_Active then
5662 -- If this is a derived subprogram then the subtypes of the parent
5663 -- subprogram's formal parameters will be used to determine the need
5664 -- for extra formals.
5666 if Is_Overloadable (E) and then Present (Alias (E)) then
5667 P_Formal := First_Formal (Alias (E));
5670 Last_Extra := Empty;
5671 Formal := First_Formal (E);
5672 while Present (Formal) loop
5673 Last_Extra := Formal;
5674 Next_Formal (Formal);
5677 -- If Extra_formals were already created, don't do it again. This
5678 -- situation may arise for subprogram types created as part of
5679 -- dispatching calls (see Expand_Dispatching_Call)
5681 if Present (Last_Extra) and then
5682 Present (Extra_Formal (Last_Extra))
5687 -- If the subprogram is a predefined dispatching subprogram then don't
5688 -- generate any extra constrained or accessibility level formals. In
5689 -- general we suppress these for internal subprograms (by not calling
5690 -- Freeze_Subprogram and Create_Extra_Formals at all), but internally
5691 -- generated stream attributes do get passed through because extra
5692 -- build-in-place formals are needed in some cases (limited 'Input
).
5694 if Is_Predefined_Internal_Operation
(E
) then
5695 goto Test_For_BIP_Extras
;
5698 Formal
:= First_Formal
(E
);
5699 while Present
(Formal
) loop
5701 -- Create extra formal for supporting the attribute 'Constrained.
5702 -- The case of a private type view without discriminants also
5703 -- requires the extra formal if the underlying type has defaulted
5706 if Ekind
(Formal
) /= E_In_Parameter
then
5707 if Present
(P_Formal
) then
5708 Formal_Type
:= Etype
(P_Formal
);
5710 Formal_Type
:= Etype
(Formal
);
5713 -- Do not produce extra formals for Unchecked_Union parameters.
5714 -- Jump directly to the end of the loop.
5716 if Is_Unchecked_Union
(Base_Type
(Formal_Type
)) then
5717 goto Skip_Extra_Formal_Generation
;
5720 if not Has_Discriminants
(Formal_Type
)
5721 and then Ekind
(Formal_Type
) in Private_Kind
5722 and then Present
(Underlying_Type
(Formal_Type
))
5724 Formal_Type
:= Underlying_Type
(Formal_Type
);
5727 -- Suppress the extra formal if formal's subtype is constrained or
5728 -- indefinite, or we're compiling for Ada 2012 and the underlying
5729 -- type is tagged and limited. In Ada 2012, a limited tagged type
5730 -- can have defaulted discriminants, but 'Constrained is required
5731 -- to return True, so the formal is never needed (see AI05-0214).
5732 -- Note that this ensures consistency of calling sequences for
5733 -- dispatching operations when some types in a class have defaults
5734 -- on discriminants and others do not (and requiring the extra
5735 -- formal would introduce distributed overhead).
5737 if Has_Discriminants
(Formal_Type
)
5738 and then not Is_Constrained
(Formal_Type
)
5739 and then not Is_Indefinite_Subtype
(Formal_Type
)
5740 and then (Ada_Version
< Ada_2012
5742 not (Is_Tagged_Type
(Underlying_Type
(Formal_Type
))
5743 and then Is_Limited_Type
(Formal_Type
)))
5745 Set_Extra_Constrained
5746 (Formal
, Add_Extra_Formal
(Formal
, Standard_Boolean
, E
, "O"));
5750 -- Create extra formal for supporting accessibility checking. This
5751 -- is done for both anonymous access formals and formals of named
5752 -- access types that are marked as controlling formals. The latter
5753 -- case can occur when Expand_Dispatching_Call creates a subprogram
5754 -- type and substitutes the types of access-to-class-wide actuals
5755 -- for the anonymous access-to-specific-type of controlling formals.
5756 -- Base_Type is applied because in cases where there is a null
5757 -- exclusion the formal may have an access subtype.
5759 -- This is suppressed if we specifically suppress accessibility
5760 -- checks at the package level for either the subprogram, or the
5761 -- package in which it resides. However, we do not suppress it
5762 -- simply if the scope has accessibility checks suppressed, since
5763 -- this could cause trouble when clients are compiled with a
5764 -- different suppression setting. The explicit checks at the
5765 -- package level are safe from this point of view.
5767 if (Ekind
(Base_Type
(Etype
(Formal
))) = E_Anonymous_Access_Type
5768 or else (Is_Controlling_Formal
(Formal
)
5769 and then Is_Access_Type
(Base_Type
(Etype
(Formal
)))))
5771 (Explicit_Suppress
(E
, Accessibility_Check
)
5773 Explicit_Suppress
(Scope
(E
), Accessibility_Check
))
5776 or else Present
(Extra_Accessibility
(P_Formal
)))
5778 Set_Extra_Accessibility
5779 (Formal
, Add_Extra_Formal
(Formal
, Standard_Natural
, E
, "L"));
5782 -- This label is required when skipping extra formal generation for
5783 -- Unchecked_Union parameters.
5785 <<Skip_Extra_Formal_Generation
>>
5787 if Present
(P_Formal
) then
5788 Next_Formal
(P_Formal
);
5791 Next_Formal
(Formal
);
5794 <<Test_For_BIP_Extras
>>
5796 -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add
5797 -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind.
5799 if Ada_Version
>= Ada_2005
and then Is_Build_In_Place_Function
(E
) then
5801 Result_Subt
: constant Entity_Id
:= Etype
(E
);
5803 Discard
: Entity_Id
;
5804 pragma Warnings
(Off
, Discard
);
5807 -- In the case of functions with unconstrained result subtypes,
5808 -- add a 4-state formal indicating whether the return object is
5809 -- allocated by the caller (1), or should be allocated by the
5810 -- callee on the secondary stack (2), in the global heap (3), or
5811 -- in a user-defined storage pool (4). For the moment we just use
5812 -- Natural for the type of this formal. Note that this formal
5813 -- isn't usually needed in the case where the result subtype is
5814 -- constrained, but it is needed when the function has a tagged
5815 -- result, because generally such functions can be called in a
5816 -- dispatching context and such calls must be handled like calls
5817 -- to a class-wide function.
5819 if not Is_Constrained
(Underlying_Type
(Result_Subt
))
5820 or else Is_Tagged_Type
(Underlying_Type
(Result_Subt
))
5824 (E
, Standard_Natural
,
5825 E
, BIP_Formal_Suffix
(BIP_Alloc_Form
));
5828 -- For functions whose result type has controlled parts, we have
5829 -- an extra formal of type System.Finalization_Implementation.
5830 -- Finalizable_Ptr_Ptr. That is, we are passing a pointer to a
5831 -- finalization list (which is itself a pointer). This extra
5832 -- formal is then passed along to Move_Final_List in case of
5833 -- successful completion of a return statement. We cannot pass an
5834 -- 'in out' parameter, because we need to update the finalization
5835 -- list during an abort-deferred region, rather than using
5836 -- copy-back after the function returns. This is true even if we
5837 -- are able to get away with having 'in out' parameters, which are
5838 -- normally illegal for functions. This formal is also needed when
5839 -- the function has a tagged result.
5841 if Needs_BIP_Final_List
(E
) then
5844 (E
, RTE
(RE_Finalizable_Ptr_Ptr
),
5845 E
, BIP_Formal_Suffix
(BIP_Final_List
));
5848 -- If the result type contains tasks, we have two extra formals:
5849 -- the master of the tasks to be created, and the caller's
5850 -- activation chain.
5852 if Has_Task
(Result_Subt
) then
5855 (E
, RTE
(RE_Master_Id
),
5856 E
, BIP_Formal_Suffix
(BIP_Master
));
5859 (E
, RTE
(RE_Activation_Chain_Access
),
5860 E
, BIP_Formal_Suffix
(BIP_Activation_Chain
));
5863 -- All build-in-place functions get an extra formal that will be
5864 -- passed the address of the return object within the caller.
5867 Formal_Type
: constant Entity_Id
:=
5869 (E_Anonymous_Access_Type
, E
,
5870 Scope_Id
=> Scope
(E
));
5872 Set_Directly_Designated_Type
(Formal_Type
, Result_Subt
);
5873 Set_Etype
(Formal_Type
, Formal_Type
);
5874 Set_Depends_On_Private
5875 (Formal_Type
, Has_Private_Component
(Formal_Type
));
5876 Set_Is_Public
(Formal_Type
, Is_Public
(Scope
(Formal_Type
)));
5877 Set_Is_Access_Constant
(Formal_Type
, False);
5879 -- Ada 2005 (AI-50217): Propagate the attribute that indicates
5880 -- the designated type comes from the limited view (for
5881 -- back-end purposes).
5883 Set_From_With_Type
(Formal_Type
, From_With_Type
(Result_Subt
));
5885 Layout_Type
(Formal_Type
);
5889 (E
, Formal_Type
, E
, BIP_Formal_Suffix
(BIP_Object_Access
));
5893 end Create_Extra_Formals
;
5895 -----------------------------
5896 -- Enter_Overloaded_Entity --
5897 -----------------------------
5899 procedure Enter_Overloaded_Entity
(S
: Entity_Id
) is
5900 E
: Entity_Id
:= Current_Entity_In_Scope
(S
);
5901 C_E
: Entity_Id
:= Current_Entity
(S
);
5905 Set_Has_Homonym
(E
);
5906 Set_Has_Homonym
(S
);
5909 Set_Is_Immediately_Visible
(S
);
5910 Set_Scope
(S
, Current_Scope
);
5912 -- Chain new entity if front of homonym in current scope, so that
5913 -- homonyms are contiguous.
5918 while Homonym
(C_E
) /= E
loop
5919 C_E
:= Homonym
(C_E
);
5922 Set_Homonym
(C_E
, S
);
5926 Set_Current_Entity
(S
);
5931 Append_Entity
(S
, Current_Scope
);
5932 Set_Public_Status
(S
);
5934 if Debug_Flag_E
then
5935 Write_Str
("New overloaded entity chain: ");
5936 Write_Name
(Chars
(S
));
5939 while Present
(E
) loop
5940 Write_Str
(" "); Write_Int
(Int
(E
));
5947 -- Generate warning for hiding
5950 and then Comes_From_Source
(S
)
5951 and then In_Extended_Main_Source_Unit
(S
)
5958 -- Warn unless genuine overloading. Do not emit warning on
5959 -- hiding predefined operators in Standard (these are either an
5960 -- (artifact of our implicit declarations, or simple noise) but
5961 -- keep warning on a operator defined on a local subtype, because
5962 -- of the real danger that different operators may be applied in
5963 -- various parts of the program.
5965 if (not Is_Overloadable
(E
) or else Subtype_Conformant
(E
, S
))
5966 and then (Is_Immediately_Visible
(E
)
5968 Is_Potentially_Use_Visible
(S
))
5970 if Scope
(E
) /= Standard_Standard
then
5971 Error_Msg_Sloc
:= Sloc
(E
);
5972 Error_Msg_N
("declaration of & hides one#?", S
);
5974 elsif Nkind
(S
) = N_Defining_Operator_Symbol
5977 Base_Type
(Etype
(First_Formal
(S
)))) /= Scope
(S
)
5980 ("declaration of & hides predefined operator?", S
);
5985 end Enter_Overloaded_Entity
;
5987 -----------------------------
5988 -- Check_Untagged_Equality --
5989 -----------------------------
5991 procedure Check_Untagged_Equality
(Eq_Op
: Entity_Id
) is
5992 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
5993 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Eq_Op
);
5997 if Nkind
(Decl
) = N_Subprogram_Declaration
5998 and then Is_Record_Type
(Typ
)
5999 and then not Is_Tagged_Type
(Typ
)
6001 -- If the type is not declared in a package, or if we are in the
6002 -- body of the package or in some other scope, the new operation is
6003 -- not primitive, and therefore legal, though suspicious. If the
6004 -- type is a generic actual (sub)type, the operation is not primitive
6005 -- either because the base type is declared elsewhere.
6007 if Is_Frozen
(Typ
) then
6008 if Ekind
(Scope
(Typ
)) /= E_Package
6009 or else Scope
(Typ
) /= Current_Scope
6013 elsif Is_Generic_Actual_Type
(Typ
) then
6016 elsif In_Package_Body
(Scope
(Typ
)) then
6018 ("equality operator must be declared "
6019 & "before type& is frozen", Eq_Op
, Typ
);
6021 ("\move declaration to package spec", Eq_Op
);
6025 ("equality operator must be declared "
6026 & "before type& is frozen", Eq_Op
, Typ
);
6028 Obj_Decl
:= Next
(Parent
(Typ
));
6029 while Present
(Obj_Decl
)
6030 and then Obj_Decl
/= Decl
6032 if Nkind
(Obj_Decl
) = N_Object_Declaration
6033 and then Etype
(Defining_Identifier
(Obj_Decl
)) = Typ
6035 Error_Msg_NE
("type& is frozen by declaration?",
6038 ("\an equality operator cannot be declared after this "
6039 & "point ('R'M 4.5.2 (9.8)) (Ada 2012))?", Obj_Decl
);
6047 elsif not In_Same_List
(Parent
(Typ
), Decl
)
6048 and then not Is_Limited_Type
(Typ
)
6051 -- This makes it illegal to have a primitive equality declared in
6052 -- the private part if the type is visible.
6054 Error_Msg_N
("equality operator appears too late", Eq_Op
);
6057 end Check_Untagged_Equality
;
6059 -----------------------------
6060 -- Find_Corresponding_Spec --
6061 -----------------------------
6063 function Find_Corresponding_Spec
6065 Post_Error
: Boolean := True) return Entity_Id
6067 Spec
: constant Node_Id
:= Specification
(N
);
6068 Designator
: constant Entity_Id
:= Defining_Entity
(Spec
);
6073 E
:= Current_Entity
(Designator
);
6074 while Present
(E
) loop
6076 -- We are looking for a matching spec. It must have the same scope,
6077 -- and the same name, and either be type conformant, or be the case
6078 -- of a library procedure spec and its body (which belong to one
6079 -- another regardless of whether they are type conformant or not).
6081 if Scope
(E
) = Current_Scope
then
6082 if Current_Scope
= Standard_Standard
6083 or else (Ekind
(E
) = Ekind
(Designator
)
6084 and then Type_Conformant
(E
, Designator
))
6086 -- Within an instantiation, we know that spec and body are
6087 -- subtype conformant, because they were subtype conformant
6088 -- in the generic. We choose the subtype-conformant entity
6089 -- here as well, to resolve spurious ambiguities in the
6090 -- instance that were not present in the generic (i.e. when
6091 -- two different types are given the same actual). If we are
6092 -- looking for a spec to match a body, full conformance is
6096 Set_Convention
(Designator
, Convention
(E
));
6098 if Nkind
(N
) = N_Subprogram_Body
6099 and then Present
(Homonym
(E
))
6100 and then not Fully_Conformant
(E
, Designator
)
6104 elsif not Subtype_Conformant
(E
, Designator
) then
6109 if not Has_Completion
(E
) then
6110 if Nkind
(N
) /= N_Subprogram_Body_Stub
then
6111 Set_Corresponding_Spec
(N
, E
);
6114 Set_Has_Completion
(E
);
6117 elsif Nkind
(Parent
(N
)) = N_Subunit
then
6119 -- If this is the proper body of a subunit, the completion
6120 -- flag is set when analyzing the stub.
6124 -- If E is an internal function with a controlling result
6125 -- that was created for an operation inherited by a null
6126 -- extension, it may be overridden by a body without a previous
6127 -- spec (one more reason why these should be shunned). In that
6128 -- case remove the generated body if present, because the
6129 -- current one is the explicit overriding.
6131 elsif Ekind
(E
) = E_Function
6132 and then Ada_Version
>= Ada_2005
6133 and then not Comes_From_Source
(E
)
6134 and then Has_Controlling_Result
(E
)
6135 and then Is_Null_Extension
(Etype
(E
))
6136 and then Comes_From_Source
(Spec
)
6138 Set_Has_Completion
(E
, False);
6141 and then Nkind
(Parent
(E
)) = N_Function_Specification
6144 (Unit_Declaration_Node
6145 (Corresponding_Body
(Unit_Declaration_Node
(E
))));
6149 -- If expansion is disabled, or if the wrapper function has
6150 -- not been generated yet, this a late body overriding an
6151 -- inherited operation, or it is an overriding by some other
6152 -- declaration before the controlling result is frozen. In
6153 -- either case this is a declaration of a new entity.
6159 -- If the body already exists, then this is an error unless
6160 -- the previous declaration is the implicit declaration of a
6161 -- derived subprogram, or this is a spurious overloading in an
6164 elsif No
(Alias
(E
))
6165 and then not Is_Intrinsic_Subprogram
(E
)
6166 and then not In_Instance
6169 Error_Msg_Sloc
:= Sloc
(E
);
6171 if Is_Imported
(E
) then
6173 ("body not allowed for imported subprogram & declared#",
6176 Error_Msg_NE
("duplicate body for & declared#", N
, E
);
6180 -- Child units cannot be overloaded, so a conformance mismatch
6181 -- between body and a previous spec is an error.
6183 elsif Is_Child_Unit
(E
)
6185 Nkind
(Unit_Declaration_Node
(Designator
)) = N_Subprogram_Body
6187 Nkind
(Parent
(Unit_Declaration_Node
(Designator
))) =
6192 ("body of child unit does not match previous declaration", N
);
6200 -- On exit, we know that no previous declaration of subprogram exists
6203 end Find_Corresponding_Spec
;
6205 ----------------------
6206 -- Fully_Conformant --
6207 ----------------------
6209 function Fully_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
6212 Check_Conformance
(New_Id
, Old_Id
, Fully_Conformant
, False, Result
);
6214 end Fully_Conformant
;
6216 ----------------------------------
6217 -- Fully_Conformant_Expressions --
6218 ----------------------------------
6220 function Fully_Conformant_Expressions
6221 (Given_E1
: Node_Id
;
6222 Given_E2
: Node_Id
) return Boolean
6224 E1
: constant Node_Id
:= Original_Node
(Given_E1
);
6225 E2
: constant Node_Id
:= Original_Node
(Given_E2
);
6226 -- We always test conformance on original nodes, since it is possible
6227 -- for analysis and/or expansion to make things look as though they
6228 -- conform when they do not, e.g. by converting 1+2 into 3.
6230 function FCE
(Given_E1
, Given_E2
: Node_Id
) return Boolean
6231 renames Fully_Conformant_Expressions
;
6233 function FCL
(L1
, L2
: List_Id
) return Boolean;
6234 -- Compare elements of two lists for conformance. Elements have to
6235 -- be conformant, and actuals inserted as default parameters do not
6236 -- match explicit actuals with the same value.
6238 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean;
6239 -- Compare an operator node with a function call
6245 function FCL
(L1
, L2
: List_Id
) return Boolean is
6249 if L1
= No_List
then
6255 if L2
= No_List
then
6261 -- Compare two lists, skipping rewrite insertions (we want to
6262 -- compare the original trees, not the expanded versions!)
6265 if Is_Rewrite_Insertion
(N1
) then
6267 elsif Is_Rewrite_Insertion
(N2
) then
6273 elsif not FCE
(N1
, N2
) then
6286 function FCO
(Op_Node
, Call_Node
: Node_Id
) return Boolean is
6287 Actuals
: constant List_Id
:= Parameter_Associations
(Call_Node
);
6292 or else Entity
(Op_Node
) /= Entity
(Name
(Call_Node
))
6297 Act
:= First
(Actuals
);
6299 if Nkind
(Op_Node
) in N_Binary_Op
then
6300 if not FCE
(Left_Opnd
(Op_Node
), Act
) then
6307 return Present
(Act
)
6308 and then FCE
(Right_Opnd
(Op_Node
), Act
)
6309 and then No
(Next
(Act
));
6313 -- Start of processing for Fully_Conformant_Expressions
6316 -- Non-conformant if paren count does not match. Note: if some idiot
6317 -- complains that we don't do this right for more than 3 levels of
6318 -- parentheses, they will be treated with the respect they deserve!
6320 if Paren_Count
(E1
) /= Paren_Count
(E2
) then
6323 -- If same entities are referenced, then they are conformant even if
6324 -- they have different forms (RM 8.3.1(19-20)).
6326 elsif Is_Entity_Name
(E1
) and then Is_Entity_Name
(E2
) then
6327 if Present
(Entity
(E1
)) then
6328 return Entity
(E1
) = Entity
(E2
)
6329 or else (Chars
(Entity
(E1
)) = Chars
(Entity
(E2
))
6330 and then Ekind
(Entity
(E1
)) = E_Discriminant
6331 and then Ekind
(Entity
(E2
)) = E_In_Parameter
);
6333 elsif Nkind
(E1
) = N_Expanded_Name
6334 and then Nkind
(E2
) = N_Expanded_Name
6335 and then Nkind
(Selector_Name
(E1
)) = N_Character_Literal
6336 and then Nkind
(Selector_Name
(E2
)) = N_Character_Literal
6338 return Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
));
6341 -- Identifiers in component associations don't always have
6342 -- entities, but their names must conform.
6344 return Nkind
(E1
) = N_Identifier
6345 and then Nkind
(E2
) = N_Identifier
6346 and then Chars
(E1
) = Chars
(E2
);
6349 elsif Nkind
(E1
) = N_Character_Literal
6350 and then Nkind
(E2
) = N_Expanded_Name
6352 return Nkind
(Selector_Name
(E2
)) = N_Character_Literal
6353 and then Chars
(E1
) = Chars
(Selector_Name
(E2
));
6355 elsif Nkind
(E2
) = N_Character_Literal
6356 and then Nkind
(E1
) = N_Expanded_Name
6358 return Nkind
(Selector_Name
(E1
)) = N_Character_Literal
6359 and then Chars
(E2
) = Chars
(Selector_Name
(E1
));
6361 elsif Nkind
(E1
) in N_Op
6362 and then Nkind
(E2
) = N_Function_Call
6364 return FCO
(E1
, E2
);
6366 elsif Nkind
(E2
) in N_Op
6367 and then Nkind
(E1
) = N_Function_Call
6369 return FCO
(E2
, E1
);
6371 -- Otherwise we must have the same syntactic entity
6373 elsif Nkind
(E1
) /= Nkind
(E2
) then
6376 -- At this point, we specialize by node type
6383 FCL
(Expressions
(E1
), Expressions
(E2
))
6385 FCL
(Component_Associations
(E1
),
6386 Component_Associations
(E2
));
6389 if Nkind
(Expression
(E1
)) = N_Qualified_Expression
6391 Nkind
(Expression
(E2
)) = N_Qualified_Expression
6393 return FCE
(Expression
(E1
), Expression
(E2
));
6395 -- Check that the subtype marks and any constraints
6400 Indic1
: constant Node_Id
:= Expression
(E1
);
6401 Indic2
: constant Node_Id
:= Expression
(E2
);
6406 if Nkind
(Indic1
) /= N_Subtype_Indication
then
6408 Nkind
(Indic2
) /= N_Subtype_Indication
6409 and then Entity
(Indic1
) = Entity
(Indic2
);
6411 elsif Nkind
(Indic2
) /= N_Subtype_Indication
then
6413 Nkind
(Indic1
) /= N_Subtype_Indication
6414 and then Entity
(Indic1
) = Entity
(Indic2
);
6417 if Entity
(Subtype_Mark
(Indic1
)) /=
6418 Entity
(Subtype_Mark
(Indic2
))
6423 Elt1
:= First
(Constraints
(Constraint
(Indic1
)));
6424 Elt2
:= First
(Constraints
(Constraint
(Indic2
)));
6425 while Present
(Elt1
) and then Present
(Elt2
) loop
6426 if not FCE
(Elt1
, Elt2
) then
6439 when N_Attribute_Reference
=>
6441 Attribute_Name
(E1
) = Attribute_Name
(E2
)
6442 and then FCL
(Expressions
(E1
), Expressions
(E2
));
6446 Entity
(E1
) = Entity
(E2
)
6447 and then FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
6448 and then FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6450 when N_Short_Circuit | N_Membership_Test
=>
6452 FCE
(Left_Opnd
(E1
), Left_Opnd
(E2
))
6454 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6456 when N_Case_Expression
=>
6462 if not FCE
(Expression
(E1
), Expression
(E2
)) then
6466 Alt1
:= First
(Alternatives
(E1
));
6467 Alt2
:= First
(Alternatives
(E2
));
6469 if Present
(Alt1
) /= Present
(Alt2
) then
6471 elsif No
(Alt1
) then
6475 if not FCE
(Expression
(Alt1
), Expression
(Alt2
))
6476 or else not FCL
(Discrete_Choices
(Alt1
),
6477 Discrete_Choices
(Alt2
))
6488 when N_Character_Literal
=>
6490 Char_Literal_Value
(E1
) = Char_Literal_Value
(E2
);
6492 when N_Component_Association
=>
6494 FCL
(Choices
(E1
), Choices
(E2
))
6496 FCE
(Expression
(E1
), Expression
(E2
));
6498 when N_Conditional_Expression
=>
6500 FCL
(Expressions
(E1
), Expressions
(E2
));
6502 when N_Explicit_Dereference
=>
6504 FCE
(Prefix
(E1
), Prefix
(E2
));
6506 when N_Extension_Aggregate
=>
6508 FCL
(Expressions
(E1
), Expressions
(E2
))
6509 and then Null_Record_Present
(E1
) =
6510 Null_Record_Present
(E2
)
6511 and then FCL
(Component_Associations
(E1
),
6512 Component_Associations
(E2
));
6514 when N_Function_Call
=>
6516 FCE
(Name
(E1
), Name
(E2
))
6518 FCL
(Parameter_Associations
(E1
),
6519 Parameter_Associations
(E2
));
6521 when N_Indexed_Component
=>
6523 FCE
(Prefix
(E1
), Prefix
(E2
))
6525 FCL
(Expressions
(E1
), Expressions
(E2
));
6527 when N_Integer_Literal
=>
6528 return (Intval
(E1
) = Intval
(E2
));
6533 when N_Operator_Symbol
=>
6535 Chars
(E1
) = Chars
(E2
);
6537 when N_Others_Choice
=>
6540 when N_Parameter_Association
=>
6542 Chars
(Selector_Name
(E1
)) = Chars
(Selector_Name
(E2
))
6543 and then FCE
(Explicit_Actual_Parameter
(E1
),
6544 Explicit_Actual_Parameter
(E2
));
6546 when N_Qualified_Expression
=>
6548 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6550 FCE
(Expression
(E1
), Expression
(E2
));
6554 FCE
(Low_Bound
(E1
), Low_Bound
(E2
))
6556 FCE
(High_Bound
(E1
), High_Bound
(E2
));
6558 when N_Real_Literal
=>
6559 return (Realval
(E1
) = Realval
(E2
));
6561 when N_Selected_Component
=>
6563 FCE
(Prefix
(E1
), Prefix
(E2
))
6565 FCE
(Selector_Name
(E1
), Selector_Name
(E2
));
6569 FCE
(Prefix
(E1
), Prefix
(E2
))
6571 FCE
(Discrete_Range
(E1
), Discrete_Range
(E2
));
6573 when N_String_Literal
=>
6575 S1
: constant String_Id
:= Strval
(E1
);
6576 S2
: constant String_Id
:= Strval
(E2
);
6577 L1
: constant Nat
:= String_Length
(S1
);
6578 L2
: constant Nat
:= String_Length
(S2
);
6585 for J
in 1 .. L1
loop
6586 if Get_String_Char
(S1
, J
) /=
6587 Get_String_Char
(S2
, J
)
6597 when N_Type_Conversion
=>
6599 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6601 FCE
(Expression
(E1
), Expression
(E2
));
6605 Entity
(E1
) = Entity
(E2
)
6607 FCE
(Right_Opnd
(E1
), Right_Opnd
(E2
));
6609 when N_Unchecked_Type_Conversion
=>
6611 FCE
(Subtype_Mark
(E1
), Subtype_Mark
(E2
))
6613 FCE
(Expression
(E1
), Expression
(E2
));
6615 -- All other node types cannot appear in this context. Strictly
6616 -- we should raise a fatal internal error. Instead we just ignore
6617 -- the nodes. This means that if anyone makes a mistake in the
6618 -- expander and mucks an expression tree irretrievably, the
6619 -- result will be a failure to detect a (probably very obscure)
6620 -- case of non-conformance, which is better than bombing on some
6621 -- case where two expressions do in fact conform.
6628 end Fully_Conformant_Expressions
;
6630 ----------------------------------------
6631 -- Fully_Conformant_Discrete_Subtypes --
6632 ----------------------------------------
6634 function Fully_Conformant_Discrete_Subtypes
6635 (Given_S1
: Node_Id
;
6636 Given_S2
: Node_Id
) return Boolean
6638 S1
: constant Node_Id
:= Original_Node
(Given_S1
);
6639 S2
: constant Node_Id
:= Original_Node
(Given_S2
);
6641 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean;
6642 -- Special-case for a bound given by a discriminant, which in the body
6643 -- is replaced with the discriminal of the enclosing type.
6645 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean;
6646 -- Check both bounds
6648 -----------------------
6649 -- Conforming_Bounds --
6650 -----------------------
6652 function Conforming_Bounds
(B1
, B2
: Node_Id
) return Boolean is
6654 if Is_Entity_Name
(B1
)
6655 and then Is_Entity_Name
(B2
)
6656 and then Ekind
(Entity
(B1
)) = E_Discriminant
6658 return Chars
(B1
) = Chars
(B2
);
6661 return Fully_Conformant_Expressions
(B1
, B2
);
6663 end Conforming_Bounds
;
6665 -----------------------
6666 -- Conforming_Ranges --
6667 -----------------------
6669 function Conforming_Ranges
(R1
, R2
: Node_Id
) return Boolean is
6672 Conforming_Bounds
(Low_Bound
(R1
), Low_Bound
(R2
))
6674 Conforming_Bounds
(High_Bound
(R1
), High_Bound
(R2
));
6675 end Conforming_Ranges
;
6677 -- Start of processing for Fully_Conformant_Discrete_Subtypes
6680 if Nkind
(S1
) /= Nkind
(S2
) then
6683 elsif Is_Entity_Name
(S1
) then
6684 return Entity
(S1
) = Entity
(S2
);
6686 elsif Nkind
(S1
) = N_Range
then
6687 return Conforming_Ranges
(S1
, S2
);
6689 elsif Nkind
(S1
) = N_Subtype_Indication
then
6691 Entity
(Subtype_Mark
(S1
)) = Entity
(Subtype_Mark
(S2
))
6694 (Range_Expression
(Constraint
(S1
)),
6695 Range_Expression
(Constraint
(S2
)));
6699 end Fully_Conformant_Discrete_Subtypes
;
6701 --------------------
6702 -- Install_Entity --
6703 --------------------
6705 procedure Install_Entity
(E
: Entity_Id
) is
6706 Prev
: constant Entity_Id
:= Current_Entity
(E
);
6708 Set_Is_Immediately_Visible
(E
);
6709 Set_Current_Entity
(E
);
6710 Set_Homonym
(E
, Prev
);
6713 ---------------------
6714 -- Install_Formals --
6715 ---------------------
6717 procedure Install_Formals
(Id
: Entity_Id
) is
6720 F
:= First_Formal
(Id
);
6721 while Present
(F
) loop
6725 end Install_Formals
;
6727 -----------------------------
6728 -- Is_Interface_Conformant --
6729 -----------------------------
6731 function Is_Interface_Conformant
6732 (Tagged_Type
: Entity_Id
;
6733 Iface_Prim
: Entity_Id
;
6734 Prim
: Entity_Id
) return Boolean
6736 Iface
: constant Entity_Id
:= Find_Dispatching_Type
(Iface_Prim
);
6737 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Prim
);
6740 pragma Assert
(Is_Subprogram
(Iface_Prim
)
6741 and then Is_Subprogram
(Prim
)
6742 and then Is_Dispatching_Operation
(Iface_Prim
)
6743 and then Is_Dispatching_Operation
(Prim
));
6745 pragma Assert
(Is_Interface
(Iface
)
6746 or else (Present
(Alias
(Iface_Prim
))
6749 (Find_Dispatching_Type
(Ultimate_Alias
(Iface_Prim
)))));
6751 if Prim
= Iface_Prim
6752 or else not Is_Subprogram
(Prim
)
6753 or else Ekind
(Prim
) /= Ekind
(Iface_Prim
)
6754 or else not Is_Dispatching_Operation
(Prim
)
6755 or else Scope
(Prim
) /= Scope
(Tagged_Type
)
6757 or else Base_Type
(Typ
) /= Tagged_Type
6758 or else not Primitive_Names_Match
(Iface_Prim
, Prim
)
6762 -- Case of a procedure, or a function that does not have a controlling
6763 -- result (I or access I).
6765 elsif Ekind
(Iface_Prim
) = E_Procedure
6766 or else Etype
(Prim
) = Etype
(Iface_Prim
)
6767 or else not Has_Controlling_Result
(Prim
)
6769 return Type_Conformant
6770 (Iface_Prim
, Prim
, Skip_Controlling_Formals
=> True);
6772 -- Case of a function returning an interface, or an access to one.
6773 -- Check that the return types correspond.
6775 elsif Implements_Interface
(Typ
, Iface
) then
6776 if (Ekind
(Etype
(Prim
)) = E_Anonymous_Access_Type
)
6778 (Ekind
(Etype
(Iface_Prim
)) = E_Anonymous_Access_Type
)
6783 Type_Conformant
(Prim
, Iface_Prim
,
6784 Skip_Controlling_Formals
=> True);
6790 end Is_Interface_Conformant
;
6792 ---------------------------------
6793 -- Is_Non_Overriding_Operation --
6794 ---------------------------------
6796 function Is_Non_Overriding_Operation
6797 (Prev_E
: Entity_Id
;
6798 New_E
: Entity_Id
) return Boolean
6802 G_Typ
: Entity_Id
:= Empty
;
6804 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
;
6805 -- If F_Type is a derived type associated with a generic actual subtype,
6806 -- then return its Generic_Parent_Type attribute, else return Empty.
6808 function Types_Correspond
6809 (P_Type
: Entity_Id
;
6810 N_Type
: Entity_Id
) return Boolean;
6811 -- Returns true if and only if the types (or designated types in the
6812 -- case of anonymous access types) are the same or N_Type is derived
6813 -- directly or indirectly from P_Type.
6815 -----------------------------
6816 -- Get_Generic_Parent_Type --
6817 -----------------------------
6819 function Get_Generic_Parent_Type
(F_Typ
: Entity_Id
) return Entity_Id
is
6824 if Is_Derived_Type
(F_Typ
)
6825 and then Nkind
(Parent
(F_Typ
)) = N_Full_Type_Declaration
6827 -- The tree must be traversed to determine the parent subtype in
6828 -- the generic unit, which unfortunately isn't always available
6829 -- via semantic attributes. ??? (Note: The use of Original_Node
6830 -- is needed for cases where a full derived type has been
6833 Indic
:= Subtype_Indication
6834 (Type_Definition
(Original_Node
(Parent
(F_Typ
))));
6836 if Nkind
(Indic
) = N_Subtype_Indication
then
6837 G_Typ
:= Entity
(Subtype_Mark
(Indic
));
6839 G_Typ
:= Entity
(Indic
);
6842 if Nkind
(Parent
(G_Typ
)) = N_Subtype_Declaration
6843 and then Present
(Generic_Parent_Type
(Parent
(G_Typ
)))
6845 return Generic_Parent_Type
(Parent
(G_Typ
));
6850 end Get_Generic_Parent_Type
;
6852 ----------------------
6853 -- Types_Correspond --
6854 ----------------------
6856 function Types_Correspond
6857 (P_Type
: Entity_Id
;
6858 N_Type
: Entity_Id
) return Boolean
6860 Prev_Type
: Entity_Id
:= Base_Type
(P_Type
);
6861 New_Type
: Entity_Id
:= Base_Type
(N_Type
);
6864 if Ekind
(Prev_Type
) = E_Anonymous_Access_Type
then
6865 Prev_Type
:= Designated_Type
(Prev_Type
);
6868 if Ekind
(New_Type
) = E_Anonymous_Access_Type
then
6869 New_Type
:= Designated_Type
(New_Type
);
6872 if Prev_Type
= New_Type
then
6875 elsif not Is_Class_Wide_Type
(New_Type
) then
6876 while Etype
(New_Type
) /= New_Type
loop
6877 New_Type
:= Etype
(New_Type
);
6878 if New_Type
= Prev_Type
then
6884 end Types_Correspond
;
6886 -- Start of processing for Is_Non_Overriding_Operation
6889 -- In the case where both operations are implicit derived subprograms
6890 -- then neither overrides the other. This can only occur in certain
6891 -- obscure cases (e.g., derivation from homographs created in a generic
6894 if Present
(Alias
(Prev_E
)) and then Present
(Alias
(New_E
)) then
6897 elsif Ekind
(Current_Scope
) = E_Package
6898 and then Is_Generic_Instance
(Current_Scope
)
6899 and then In_Private_Part
(Current_Scope
)
6900 and then Comes_From_Source
(New_E
)
6902 -- We examine the formals and result subtype of the inherited
6903 -- operation, to determine whether their type is derived from (the
6904 -- instance of) a generic type.
6906 Formal
:= First_Formal
(Prev_E
);
6907 while Present
(Formal
) loop
6908 F_Typ
:= Base_Type
(Etype
(Formal
));
6910 if Ekind
(F_Typ
) = E_Anonymous_Access_Type
then
6911 F_Typ
:= Designated_Type
(F_Typ
);
6914 G_Typ
:= Get_Generic_Parent_Type
(F_Typ
);
6916 Next_Formal
(Formal
);
6919 if No
(G_Typ
) and then Ekind
(Prev_E
) = E_Function
then
6920 G_Typ
:= Get_Generic_Parent_Type
(Base_Type
(Etype
(Prev_E
)));
6927 -- If the generic type is a private type, then the original operation
6928 -- was not overriding in the generic, because there was no primitive
6929 -- operation to override.
6931 if Nkind
(Parent
(G_Typ
)) = N_Formal_Type_Declaration
6932 and then Nkind
(Formal_Type_Definition
(Parent
(G_Typ
))) =
6933 N_Formal_Private_Type_Definition
6937 -- The generic parent type is the ancestor of a formal derived
6938 -- type declaration. We need to check whether it has a primitive
6939 -- operation that should be overridden by New_E in the generic.
6943 P_Formal
: Entity_Id
;
6944 N_Formal
: Entity_Id
;
6948 Prim_Elt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(G_Typ
));
6951 while Present
(Prim_Elt
) loop
6952 P_Prim
:= Node
(Prim_Elt
);
6954 if Chars
(P_Prim
) = Chars
(New_E
)
6955 and then Ekind
(P_Prim
) = Ekind
(New_E
)
6957 P_Formal
:= First_Formal
(P_Prim
);
6958 N_Formal
:= First_Formal
(New_E
);
6959 while Present
(P_Formal
) and then Present
(N_Formal
) loop
6960 P_Typ
:= Etype
(P_Formal
);
6961 N_Typ
:= Etype
(N_Formal
);
6963 if not Types_Correspond
(P_Typ
, N_Typ
) then
6967 Next_Entity
(P_Formal
);
6968 Next_Entity
(N_Formal
);
6971 -- Found a matching primitive operation belonging to the
6972 -- formal ancestor type, so the new subprogram is
6976 and then No
(N_Formal
)
6977 and then (Ekind
(New_E
) /= E_Function
6980 (Etype
(P_Prim
), Etype
(New_E
)))
6986 Next_Elmt
(Prim_Elt
);
6989 -- If no match found, then the new subprogram does not
6990 -- override in the generic (nor in the instance).
6998 end Is_Non_Overriding_Operation
;
7000 -------------------------------------
7001 -- List_Inherited_Pre_Post_Aspects --
7002 -------------------------------------
7004 procedure List_Inherited_Pre_Post_Aspects
(E
: Entity_Id
) is
7006 if Opt
.List_Inherited_Aspects
7007 and then (Is_Subprogram
(E
) or else Is_Generic_Subprogram
(E
))
7010 Inherited
: constant Subprogram_List
:=
7011 Inherited_Subprograms
(E
);
7015 for J
in Inherited
'Range loop
7016 P
:= Spec_PPC_List
(Inherited
(J
));
7017 while Present
(P
) loop
7018 Error_Msg_Sloc
:= Sloc
(P
);
7020 if Class_Present
(P
) and then not Split_PPC
(P
) then
7021 if Pragma_Name
(P
) = Name_Precondition
then
7023 ("?info: & inherits `Pre''Class` aspect from #", E
);
7026 ("?info: & inherits `Post''Class` aspect from #", E
);
7030 P
:= Next_Pragma
(P
);
7035 end List_Inherited_Pre_Post_Aspects
;
7037 ------------------------------
7038 -- Make_Inequality_Operator --
7039 ------------------------------
7041 -- S is the defining identifier of an equality operator. We build a
7042 -- subprogram declaration with the right signature. This operation is
7043 -- intrinsic, because it is always expanded as the negation of the
7044 -- call to the equality function.
7046 procedure Make_Inequality_Operator
(S
: Entity_Id
) is
7047 Loc
: constant Source_Ptr
:= Sloc
(S
);
7050 Op_Name
: Entity_Id
;
7052 FF
: constant Entity_Id
:= First_Formal
(S
);
7053 NF
: constant Entity_Id
:= Next_Formal
(FF
);
7056 -- Check that equality was properly defined, ignore call if not
7063 A
: constant Entity_Id
:=
7064 Make_Defining_Identifier
(Sloc
(FF
),
7065 Chars
=> Chars
(FF
));
7067 B
: constant Entity_Id
:=
7068 Make_Defining_Identifier
(Sloc
(NF
),
7069 Chars
=> Chars
(NF
));
7072 Op_Name
:= Make_Defining_Operator_Symbol
(Loc
, Name_Op_Ne
);
7074 Formals
:= New_List
(
7075 Make_Parameter_Specification
(Loc
,
7076 Defining_Identifier
=> A
,
7078 New_Reference_To
(Etype
(First_Formal
(S
)),
7079 Sloc
(Etype
(First_Formal
(S
))))),
7081 Make_Parameter_Specification
(Loc
,
7082 Defining_Identifier
=> B
,
7084 New_Reference_To
(Etype
(Next_Formal
(First_Formal
(S
))),
7085 Sloc
(Etype
(Next_Formal
(First_Formal
(S
)))))));
7088 Make_Subprogram_Declaration
(Loc
,
7090 Make_Function_Specification
(Loc
,
7091 Defining_Unit_Name
=> Op_Name
,
7092 Parameter_Specifications
=> Formals
,
7093 Result_Definition
=>
7094 New_Reference_To
(Standard_Boolean
, Loc
)));
7096 -- Insert inequality right after equality if it is explicit or after
7097 -- the derived type when implicit. These entities are created only
7098 -- for visibility purposes, and eventually replaced in the course of
7099 -- expansion, so they do not need to be attached to the tree and seen
7100 -- by the back-end. Keeping them internal also avoids spurious
7101 -- freezing problems. The declaration is inserted in the tree for
7102 -- analysis, and removed afterwards. If the equality operator comes
7103 -- from an explicit declaration, attach the inequality immediately
7104 -- after. Else the equality is inherited from a derived type
7105 -- declaration, so insert inequality after that declaration.
7107 if No
(Alias
(S
)) then
7108 Insert_After
(Unit_Declaration_Node
(S
), Decl
);
7109 elsif Is_List_Member
(Parent
(S
)) then
7110 Insert_After
(Parent
(S
), Decl
);
7112 Insert_After
(Parent
(Etype
(First_Formal
(S
))), Decl
);
7115 Mark_Rewrite_Insertion
(Decl
);
7116 Set_Is_Intrinsic_Subprogram
(Op_Name
);
7119 Set_Has_Completion
(Op_Name
);
7120 Set_Corresponding_Equality
(Op_Name
, S
);
7121 Set_Is_Abstract_Subprogram
(Op_Name
, Is_Abstract_Subprogram
(S
));
7123 end Make_Inequality_Operator
;
7125 ----------------------
7126 -- May_Need_Actuals --
7127 ----------------------
7129 procedure May_Need_Actuals
(Fun
: Entity_Id
) is
7134 F
:= First_Formal
(Fun
);
7136 while Present
(F
) loop
7137 if No
(Default_Value
(F
)) then
7145 Set_Needs_No_Actuals
(Fun
, B
);
7146 end May_Need_Actuals
;
7148 ---------------------
7149 -- Mode_Conformant --
7150 ---------------------
7152 function Mode_Conformant
(New_Id
, Old_Id
: Entity_Id
) return Boolean is
7155 Check_Conformance
(New_Id
, Old_Id
, Mode_Conformant
, False, Result
);
7157 end Mode_Conformant
;
7159 ---------------------------
7160 -- New_Overloaded_Entity --
7161 ---------------------------
7163 procedure New_Overloaded_Entity
7165 Derived_Type
: Entity_Id
:= Empty
)
7167 Overridden_Subp
: Entity_Id
:= Empty
;
7168 -- Set if the current scope has an operation that is type-conformant
7169 -- with S, and becomes hidden by S.
7171 Is_Primitive_Subp
: Boolean;
7172 -- Set to True if the new subprogram is primitive
7175 -- Entity that S overrides
7177 Prev_Vis
: Entity_Id
:= Empty
;
7178 -- Predecessor of E in Homonym chain
7180 procedure Check_For_Primitive_Subprogram
7181 (Is_Primitive
: out Boolean;
7182 Is_Overriding
: Boolean := False);
7183 -- If the subprogram being analyzed is a primitive operation of the type
7184 -- of a formal or result, set the Has_Primitive_Operations flag on the
7185 -- type, and set Is_Primitive to True (otherwise set to False). Set the
7186 -- corresponding flag on the entity itself for later use.
7188 procedure Check_Synchronized_Overriding
7189 (Def_Id
: Entity_Id
;
7190 Overridden_Subp
: out Entity_Id
);
7191 -- First determine if Def_Id is an entry or a subprogram either defined
7192 -- in the scope of a task or protected type, or is a primitive of such
7193 -- a type. Check whether Def_Id overrides a subprogram of an interface
7194 -- implemented by the synchronized type, return the overridden entity
7197 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean;
7198 -- Check that E is declared in the private part of the current package,
7199 -- or in the package body, where it may hide a previous declaration.
7200 -- We can't use In_Private_Part by itself because this flag is also
7201 -- set when freezing entities, so we must examine the place of the
7202 -- declaration in the tree, and recognize wrapper packages as well.
7204 function Is_Overriding_Alias
7206 New_E
: Entity_Id
) return Boolean;
7207 -- Check whether new subprogram and old subprogram are both inherited
7208 -- from subprograms that have distinct dispatch table entries. This can
7209 -- occur with derivations from instances with accidental homonyms.
7210 -- The function is conservative given that the converse is only true
7211 -- within instances that contain accidental overloadings.
7213 ------------------------------------
7214 -- Check_For_Primitive_Subprogram --
7215 ------------------------------------
7217 procedure Check_For_Primitive_Subprogram
7218 (Is_Primitive
: out Boolean;
7219 Is_Overriding
: Boolean := False)
7225 function Visible_Part_Type
(T
: Entity_Id
) return Boolean;
7226 -- Returns true if T is declared in the visible part of the current
7227 -- package scope; otherwise returns false. Assumes that T is declared
7230 procedure Check_Private_Overriding
(T
: Entity_Id
);
7231 -- Checks that if a primitive abstract subprogram of a visible
7232 -- abstract type is declared in a private part, then it must override
7233 -- an abstract subprogram declared in the visible part. Also checks
7234 -- that if a primitive function with a controlling result is declared
7235 -- in a private part, then it must override a function declared in
7236 -- the visible part.
7238 ------------------------------
7239 -- Check_Private_Overriding --
7240 ------------------------------
7242 procedure Check_Private_Overriding
(T
: Entity_Id
) is
7244 if Is_Package_Or_Generic_Package
(Current_Scope
)
7245 and then In_Private_Part
(Current_Scope
)
7246 and then Visible_Part_Type
(T
)
7247 and then not In_Instance
7249 if Is_Abstract_Type
(T
)
7250 and then Is_Abstract_Subprogram
(S
)
7251 and then (not Is_Overriding
7252 or else not Is_Abstract_Subprogram
(E
))
7255 ("abstract subprograms must be visible "
7256 & "(RM 3.9.3(10))!", S
);
7258 elsif Ekind
(S
) = E_Function
7259 and then not Is_Overriding
7261 if Is_Tagged_Type
(T
)
7262 and then T
= Base_Type
(Etype
(S
))
7265 ("private function with tagged result must"
7266 & " override visible-part function", S
);
7268 ("\move subprogram to the visible part"
7269 & " (RM 3.9.3(10))", S
);
7271 -- AI05-0073: extend this test to the case of a function
7272 -- with a controlling access result.
7274 elsif Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
7275 and then Is_Tagged_Type
(Designated_Type
(Etype
(S
)))
7277 not Is_Class_Wide_Type
(Designated_Type
(Etype
(S
)))
7278 and then Ada_Version
>= Ada_2012
7281 ("private function with controlling access result "
7282 & "must override visible-part function", S
);
7284 ("\move subprogram to the visible part"
7285 & " (RM 3.9.3(10))", S
);
7289 end Check_Private_Overriding
;
7291 -----------------------
7292 -- Visible_Part_Type --
7293 -----------------------
7295 function Visible_Part_Type
(T
: Entity_Id
) return Boolean is
7296 P
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(T
));
7300 -- If the entity is a private type, then it must be declared in a
7303 if Ekind
(T
) in Private_Kind
then
7307 -- Otherwise, we traverse the visible part looking for its
7308 -- corresponding declaration. We cannot use the declaration
7309 -- node directly because in the private part the entity of a
7310 -- private type is the one in the full view, which does not
7311 -- indicate that it is the completion of something visible.
7313 N
:= First
(Visible_Declarations
(Specification
(P
)));
7314 while Present
(N
) loop
7315 if Nkind
(N
) = N_Full_Type_Declaration
7316 and then Present
(Defining_Identifier
(N
))
7317 and then T
= Defining_Identifier
(N
)
7321 elsif Nkind_In
(N
, N_Private_Type_Declaration
,
7322 N_Private_Extension_Declaration
)
7323 and then Present
(Defining_Identifier
(N
))
7324 and then T
= Full_View
(Defining_Identifier
(N
))
7333 end Visible_Part_Type
;
7335 -- Start of processing for Check_For_Primitive_Subprogram
7338 Is_Primitive
:= False;
7340 if not Comes_From_Source
(S
) then
7343 -- If subprogram is at library level, it is not primitive operation
7345 elsif Current_Scope
= Standard_Standard
then
7348 elsif (Is_Package_Or_Generic_Package
(Current_Scope
)
7349 and then not In_Package_Body
(Current_Scope
))
7350 or else Is_Overriding
7352 -- For function, check return type
7354 if Ekind
(S
) = E_Function
then
7355 if Ekind
(Etype
(S
)) = E_Anonymous_Access_Type
then
7356 F_Typ
:= Designated_Type
(Etype
(S
));
7361 B_Typ
:= Base_Type
(F_Typ
);
7363 if Scope
(B_Typ
) = Current_Scope
7364 and then not Is_Class_Wide_Type
(B_Typ
)
7365 and then not Is_Generic_Type
(B_Typ
)
7367 Is_Primitive
:= True;
7368 Set_Has_Primitive_Operations
(B_Typ
);
7369 Set_Is_Primitive
(S
);
7370 Check_Private_Overriding
(B_Typ
);
7374 -- For all subprograms, check formals
7376 Formal
:= First_Formal
(S
);
7377 while Present
(Formal
) loop
7378 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
then
7379 F_Typ
:= Designated_Type
(Etype
(Formal
));
7381 F_Typ
:= Etype
(Formal
);
7384 B_Typ
:= Base_Type
(F_Typ
);
7386 if Ekind
(B_Typ
) = E_Access_Subtype
then
7387 B_Typ
:= Base_Type
(B_Typ
);
7390 if Scope
(B_Typ
) = Current_Scope
7391 and then not Is_Class_Wide_Type
(B_Typ
)
7392 and then not Is_Generic_Type
(B_Typ
)
7394 Is_Primitive
:= True;
7395 Set_Is_Primitive
(S
);
7396 Set_Has_Primitive_Operations
(B_Typ
);
7397 Check_Private_Overriding
(B_Typ
);
7400 Next_Formal
(Formal
);
7403 end Check_For_Primitive_Subprogram
;
7405 -----------------------------------
7406 -- Check_Synchronized_Overriding --
7407 -----------------------------------
7409 procedure Check_Synchronized_Overriding
7410 (Def_Id
: Entity_Id
;
7411 Overridden_Subp
: out Entity_Id
)
7413 Ifaces_List
: Elist_Id
;
7417 function Matches_Prefixed_View_Profile
7418 (Prim_Params
: List_Id
;
7419 Iface_Params
: List_Id
) return Boolean;
7420 -- Determine whether a subprogram's parameter profile Prim_Params
7421 -- matches that of a potentially overridden interface subprogram
7422 -- Iface_Params. Also determine if the type of first parameter of
7423 -- Iface_Params is an implemented interface.
7425 -----------------------------------
7426 -- Matches_Prefixed_View_Profile --
7427 -----------------------------------
7429 function Matches_Prefixed_View_Profile
7430 (Prim_Params
: List_Id
;
7431 Iface_Params
: List_Id
) return Boolean
7433 Iface_Id
: Entity_Id
;
7434 Iface_Param
: Node_Id
;
7435 Iface_Typ
: Entity_Id
;
7436 Prim_Id
: Entity_Id
;
7437 Prim_Param
: Node_Id
;
7438 Prim_Typ
: Entity_Id
;
7440 function Is_Implemented
7441 (Ifaces_List
: Elist_Id
;
7442 Iface
: Entity_Id
) return Boolean;
7443 -- Determine if Iface is implemented by the current task or
7446 --------------------
7447 -- Is_Implemented --
7448 --------------------
7450 function Is_Implemented
7451 (Ifaces_List
: Elist_Id
;
7452 Iface
: Entity_Id
) return Boolean
7454 Iface_Elmt
: Elmt_Id
;
7457 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
7458 while Present
(Iface_Elmt
) loop
7459 if Node
(Iface_Elmt
) = Iface
then
7463 Next_Elmt
(Iface_Elmt
);
7469 -- Start of processing for Matches_Prefixed_View_Profile
7472 Iface_Param
:= First
(Iface_Params
);
7473 Iface_Typ
:= Etype
(Defining_Identifier
(Iface_Param
));
7475 if Is_Access_Type
(Iface_Typ
) then
7476 Iface_Typ
:= Designated_Type
(Iface_Typ
);
7479 Prim_Param
:= First
(Prim_Params
);
7481 -- The first parameter of the potentially overridden subprogram
7482 -- must be an interface implemented by Prim.
7484 if not Is_Interface
(Iface_Typ
)
7485 or else not Is_Implemented
(Ifaces_List
, Iface_Typ
)
7490 -- The checks on the object parameters are done, move onto the
7491 -- rest of the parameters.
7493 if not In_Scope
then
7494 Prim_Param
:= Next
(Prim_Param
);
7497 Iface_Param
:= Next
(Iface_Param
);
7498 while Present
(Iface_Param
) and then Present
(Prim_Param
) loop
7499 Iface_Id
:= Defining_Identifier
(Iface_Param
);
7500 Iface_Typ
:= Find_Parameter_Type
(Iface_Param
);
7502 Prim_Id
:= Defining_Identifier
(Prim_Param
);
7503 Prim_Typ
:= Find_Parameter_Type
(Prim_Param
);
7505 if Ekind
(Iface_Typ
) = E_Anonymous_Access_Type
7506 and then Ekind
(Prim_Typ
) = E_Anonymous_Access_Type
7507 and then Is_Concurrent_Type
(Designated_Type
(Prim_Typ
))
7509 Iface_Typ
:= Designated_Type
(Iface_Typ
);
7510 Prim_Typ
:= Designated_Type
(Prim_Typ
);
7513 -- Case of multiple interface types inside a parameter profile
7515 -- (Obj_Param : in out Iface; ...; Param : Iface)
7517 -- If the interface type is implemented, then the matching type
7518 -- in the primitive should be the implementing record type.
7520 if Ekind
(Iface_Typ
) = E_Record_Type
7521 and then Is_Interface
(Iface_Typ
)
7522 and then Is_Implemented
(Ifaces_List
, Iface_Typ
)
7524 if Prim_Typ
/= Typ
then
7528 -- The two parameters must be both mode and subtype conformant
7530 elsif Ekind
(Iface_Id
) /= Ekind
(Prim_Id
)
7532 Conforming_Types
(Iface_Typ
, Prim_Typ
, Subtype_Conformant
)
7541 -- One of the two lists contains more parameters than the other
7543 if Present
(Iface_Param
) or else Present
(Prim_Param
) then
7548 end Matches_Prefixed_View_Profile
;
7550 -- Start of processing for Check_Synchronized_Overriding
7553 Overridden_Subp
:= Empty
;
7555 -- Def_Id must be an entry or a subprogram. We should skip predefined
7556 -- primitives internally generated by the frontend; however at this
7557 -- stage predefined primitives are still not fully decorated. As a
7558 -- minor optimization we skip here internally generated subprograms.
7560 if (Ekind
(Def_Id
) /= E_Entry
7561 and then Ekind
(Def_Id
) /= E_Function
7562 and then Ekind
(Def_Id
) /= E_Procedure
)
7563 or else not Comes_From_Source
(Def_Id
)
7568 -- Search for the concurrent declaration since it contains the list
7569 -- of all implemented interfaces. In this case, the subprogram is
7570 -- declared within the scope of a protected or a task type.
7572 if Present
(Scope
(Def_Id
))
7573 and then Is_Concurrent_Type
(Scope
(Def_Id
))
7574 and then not Is_Generic_Actual_Type
(Scope
(Def_Id
))
7576 Typ
:= Scope
(Def_Id
);
7579 -- The enclosing scope is not a synchronized type and the subprogram
7582 elsif No
(First_Formal
(Def_Id
)) then
7585 -- The subprogram has formals and hence it may be a primitive of a
7589 Typ
:= Etype
(First_Formal
(Def_Id
));
7591 if Is_Access_Type
(Typ
) then
7592 Typ
:= Directly_Designated_Type
(Typ
);
7595 if Is_Concurrent_Type
(Typ
)
7596 and then not Is_Generic_Actual_Type
(Typ
)
7600 -- This case occurs when the concurrent type is declared within
7601 -- a generic unit. As a result the corresponding record has been
7602 -- built and used as the type of the first formal, we just have
7603 -- to retrieve the corresponding concurrent type.
7605 elsif Is_Concurrent_Record_Type
(Typ
)
7606 and then Present
(Corresponding_Concurrent_Type
(Typ
))
7608 Typ
:= Corresponding_Concurrent_Type
(Typ
);
7616 -- There is no overriding to check if is an inherited operation in a
7617 -- type derivation on for a generic actual.
7619 Collect_Interfaces
(Typ
, Ifaces_List
);
7621 if Is_Empty_Elmt_List
(Ifaces_List
) then
7625 -- Determine whether entry or subprogram Def_Id overrides a primitive
7626 -- operation that belongs to one of the interfaces in Ifaces_List.
7629 Candidate
: Entity_Id
:= Empty
;
7630 Hom
: Entity_Id
:= Empty
;
7631 Iface_Typ
: Entity_Id
;
7632 Subp
: Entity_Id
:= Empty
;
7635 -- Traverse the homonym chain, looking for a potentially
7636 -- overridden subprogram that belongs to an implemented
7639 Hom
:= Current_Entity_In_Scope
(Def_Id
);
7640 while Present
(Hom
) loop
7644 or else not Is_Overloadable
(Subp
)
7645 or else not Is_Primitive
(Subp
)
7646 or else not Is_Dispatching_Operation
(Subp
)
7647 or else not Present
(Find_Dispatching_Type
(Subp
))
7648 or else not Is_Interface
(Find_Dispatching_Type
(Subp
))
7652 -- Entries and procedures can override abstract or null
7653 -- interface procedures.
7655 elsif (Ekind
(Def_Id
) = E_Procedure
7656 or else Ekind
(Def_Id
) = E_Entry
)
7657 and then Ekind
(Subp
) = E_Procedure
7658 and then Matches_Prefixed_View_Profile
7659 (Parameter_Specifications
(Parent
(Def_Id
)),
7660 Parameter_Specifications
(Parent
(Subp
)))
7664 -- For an overridden subprogram Subp, check whether the mode
7665 -- of its first parameter is correct depending on the kind
7666 -- of synchronized type.
7669 Formal
: constant Node_Id
:= First_Formal
(Candidate
);
7672 -- In order for an entry or a protected procedure to
7673 -- override, the first parameter of the overridden
7674 -- routine must be of mode "out", "in out" or
7675 -- access-to-variable.
7677 if (Ekind
(Candidate
) = E_Entry
7678 or else Ekind
(Candidate
) = E_Procedure
)
7679 and then Is_Protected_Type
(Typ
)
7680 and then Ekind
(Formal
) /= E_In_Out_Parameter
7681 and then Ekind
(Formal
) /= E_Out_Parameter
7682 and then Nkind
(Parameter_Type
(Parent
(Formal
)))
7683 /= N_Access_Definition
7687 -- All other cases are OK since a task entry or routine
7688 -- does not have a restriction on the mode of the first
7689 -- parameter of the overridden interface routine.
7692 Overridden_Subp
:= Candidate
;
7697 -- Functions can override abstract interface functions
7699 elsif Ekind
(Def_Id
) = E_Function
7700 and then Ekind
(Subp
) = E_Function
7701 and then Matches_Prefixed_View_Profile
7702 (Parameter_Specifications
(Parent
(Def_Id
)),
7703 Parameter_Specifications
(Parent
(Subp
)))
7704 and then Etype
(Result_Definition
(Parent
(Def_Id
))) =
7705 Etype
(Result_Definition
(Parent
(Subp
)))
7707 Overridden_Subp
:= Subp
;
7711 Hom
:= Homonym
(Hom
);
7714 -- After examining all candidates for overriding, we are left with
7715 -- the best match which is a mode incompatible interface routine.
7716 -- Do not emit an error if the Expander is active since this error
7717 -- will be detected later on after all concurrent types are
7718 -- expanded and all wrappers are built. This check is meant for
7719 -- spec-only compilations.
7721 if Present
(Candidate
) and then not Expander_Active
then
7723 Find_Parameter_Type
(Parent
(First_Formal
(Candidate
)));
7725 -- Def_Id is primitive of a protected type, declared inside the
7726 -- type, and the candidate is primitive of a limited or
7727 -- synchronized interface.
7730 and then Is_Protected_Type
(Typ
)
7732 (Is_Limited_Interface
(Iface_Typ
)
7733 or else Is_Protected_Interface
(Iface_Typ
)
7734 or else Is_Synchronized_Interface
(Iface_Typ
)
7735 or else Is_Task_Interface
(Iface_Typ
))
7738 ("first formal of & must be of mode `OUT`, `IN OUT`"
7739 & " or access-to-variable", Typ
, Candidate
);
7741 ("\in order to be overridden by protected procedure or "
7742 & "entry (RM 9.4(11.9/2))", Typ
);
7746 Overridden_Subp
:= Candidate
;
7749 end Check_Synchronized_Overriding
;
7751 ----------------------------
7752 -- Is_Private_Declaration --
7753 ----------------------------
7755 function Is_Private_Declaration
(E
: Entity_Id
) return Boolean is
7756 Priv_Decls
: List_Id
;
7757 Decl
: constant Node_Id
:= Unit_Declaration_Node
(E
);
7760 if Is_Package_Or_Generic_Package
(Current_Scope
)
7761 and then In_Private_Part
(Current_Scope
)
7764 Private_Declarations
(
7765 Specification
(Unit_Declaration_Node
(Current_Scope
)));
7767 return In_Package_Body
(Current_Scope
)
7769 (Is_List_Member
(Decl
)
7770 and then List_Containing
(Decl
) = Priv_Decls
)
7771 or else (Nkind
(Parent
(Decl
)) = N_Package_Specification
7774 (Defining_Entity
(Parent
(Decl
)))
7775 and then List_Containing
(Parent
(Parent
(Decl
)))
7780 end Is_Private_Declaration
;
7782 --------------------------
7783 -- Is_Overriding_Alias --
7784 --------------------------
7786 function Is_Overriding_Alias
7788 New_E
: Entity_Id
) return Boolean
7790 AO
: constant Entity_Id
:= Alias
(Old_E
);
7791 AN
: constant Entity_Id
:= Alias
(New_E
);
7794 return Scope
(AO
) /= Scope
(AN
)
7795 or else No
(DTC_Entity
(AO
))
7796 or else No
(DTC_Entity
(AN
))
7797 or else DT_Position
(AO
) = DT_Position
(AN
);
7798 end Is_Overriding_Alias
;
7800 -- Start of processing for New_Overloaded_Entity
7803 -- We need to look for an entity that S may override. This must be a
7804 -- homonym in the current scope, so we look for the first homonym of
7805 -- S in the current scope as the starting point for the search.
7807 E
:= Current_Entity_In_Scope
(S
);
7809 -- Ada 2005 (AI-251): Derivation of abstract interface primitives.
7810 -- They are directly added to the list of primitive operations of
7811 -- Derived_Type, unless this is a rederivation in the private part
7812 -- of an operation that was already derived in the visible part of
7813 -- the current package.
7815 if Ada_Version
>= Ada_2005
7816 and then Present
(Derived_Type
)
7817 and then Present
(Alias
(S
))
7818 and then Is_Dispatching_Operation
(Alias
(S
))
7819 and then Present
(Find_Dispatching_Type
(Alias
(S
)))
7820 and then Is_Interface
(Find_Dispatching_Type
(Alias
(S
)))
7822 -- For private types, when the full-view is processed we propagate to
7823 -- the full view the non-overridden entities whose attribute "alias"
7824 -- references an interface primitive. These entities were added by
7825 -- Derive_Subprograms to ensure that interface primitives are
7828 -- Inside_Freeze_Actions is non zero when S corresponds with an
7829 -- internal entity that links an interface primitive with its
7830 -- covering primitive through attribute Interface_Alias (see
7831 -- Add_Internal_Interface_Entities).
7833 if Inside_Freezing_Actions
= 0
7834 and then Is_Package_Or_Generic_Package
(Current_Scope
)
7835 and then In_Private_Part
(Current_Scope
)
7836 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
7837 and then Nkind
(Parent
(S
)) = N_Full_Type_Declaration
7838 and then Full_View
(Defining_Identifier
(Parent
(E
)))
7839 = Defining_Identifier
(Parent
(S
))
7840 and then Alias
(E
) = Alias
(S
)
7842 Check_Operation_From_Private_View
(S
, E
);
7843 Set_Is_Dispatching_Operation
(S
);
7848 Enter_Overloaded_Entity
(S
);
7849 Check_Dispatching_Operation
(S
, Empty
);
7850 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7856 -- If there is no homonym then this is definitely not overriding
7859 Enter_Overloaded_Entity
(S
);
7860 Check_Dispatching_Operation
(S
, Empty
);
7861 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
7863 -- If subprogram has an explicit declaration, check whether it
7864 -- has an overriding indicator.
7866 if Comes_From_Source
(S
) then
7867 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7869 -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then
7870 -- it may have overridden some hidden inherited primitive. Update
7871 -- Overridden_Subp to avoid spurious errors when checking the
7872 -- overriding indicator.
7874 if Ada_Version
>= Ada_2012
7875 and then No
(Overridden_Subp
)
7876 and then Is_Dispatching_Operation
(S
)
7877 and then Present
(Overridden_Operation
(S
))
7879 Overridden_Subp
:= Overridden_Operation
(S
);
7882 Check_Overriding_Indicator
7883 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
7886 -- If there is a homonym that is not overloadable, then we have an
7887 -- error, except for the special cases checked explicitly below.
7889 elsif not Is_Overloadable
(E
) then
7891 -- Check for spurious conflict produced by a subprogram that has the
7892 -- same name as that of the enclosing generic package. The conflict
7893 -- occurs within an instance, between the subprogram and the renaming
7894 -- declaration for the package. After the subprogram, the package
7895 -- renaming declaration becomes hidden.
7897 if Ekind
(E
) = E_Package
7898 and then Present
(Renamed_Object
(E
))
7899 and then Renamed_Object
(E
) = Current_Scope
7900 and then Nkind
(Parent
(Renamed_Object
(E
))) =
7901 N_Package_Specification
7902 and then Present
(Generic_Parent
(Parent
(Renamed_Object
(E
))))
7905 Set_Is_Immediately_Visible
(E
, False);
7906 Enter_Overloaded_Entity
(S
);
7907 Set_Homonym
(S
, Homonym
(E
));
7908 Check_Dispatching_Operation
(S
, Empty
);
7909 Check_Overriding_Indicator
(S
, Empty
, Is_Primitive
=> False);
7911 -- If the subprogram is implicit it is hidden by the previous
7912 -- declaration. However if it is dispatching, it must appear in the
7913 -- dispatch table anyway, because it can be dispatched to even if it
7914 -- cannot be called directly.
7916 elsif Present
(Alias
(S
)) and then not Comes_From_Source
(S
) then
7917 Set_Scope
(S
, Current_Scope
);
7919 if Is_Dispatching_Operation
(Alias
(S
)) then
7920 Check_Dispatching_Operation
(S
, Empty
);
7926 Error_Msg_Sloc
:= Sloc
(E
);
7928 -- Generate message, with useful additional warning if in generic
7930 if Is_Generic_Unit
(E
) then
7931 Error_Msg_N
("previous generic unit cannot be overloaded", S
);
7932 Error_Msg_N
("\& conflicts with declaration#", S
);
7934 Error_Msg_N
("& conflicts with declaration#", S
);
7940 -- E exists and is overloadable
7943 Check_Synchronized_Overriding
(S
, Overridden_Subp
);
7945 -- Loop through E and its homonyms to determine if any of them is
7946 -- the candidate for overriding by S.
7948 while Present
(E
) loop
7950 -- Definitely not interesting if not in the current scope
7952 if Scope
(E
) /= Current_Scope
then
7955 -- Check if we have type conformance
7957 elsif Type_Conformant
(E
, S
) then
7959 -- If the old and new entities have the same profile and one
7960 -- is not the body of the other, then this is an error, unless
7961 -- one of them is implicitly declared.
7963 -- There are some cases when both can be implicit, for example
7964 -- when both a literal and a function that overrides it are
7965 -- inherited in a derivation, or when an inherited operation
7966 -- of a tagged full type overrides the inherited operation of
7967 -- a private extension. Ada 83 had a special rule for the
7968 -- literal case. In Ada95, the later implicit operation hides
7969 -- the former, and the literal is always the former. In the
7970 -- odd case where both are derived operations declared at the
7971 -- same point, both operations should be declared, and in that
7972 -- case we bypass the following test and proceed to the next
7973 -- part. This can only occur for certain obscure cases in
7974 -- instances, when an operation on a type derived from a formal
7975 -- private type does not override a homograph inherited from
7976 -- the actual. In subsequent derivations of such a type, the
7977 -- DT positions of these operations remain distinct, if they
7980 if Present
(Alias
(S
))
7981 and then (No
(Alias
(E
))
7982 or else Comes_From_Source
(E
)
7983 or else Is_Abstract_Subprogram
(S
)
7985 (Is_Dispatching_Operation
(E
)
7986 and then Is_Overriding_Alias
(E
, S
)))
7987 and then Ekind
(E
) /= E_Enumeration_Literal
7989 -- When an derived operation is overloaded it may be due to
7990 -- the fact that the full view of a private extension
7991 -- re-inherits. It has to be dealt with.
7993 if Is_Package_Or_Generic_Package
(Current_Scope
)
7994 and then In_Private_Part
(Current_Scope
)
7996 Check_Operation_From_Private_View
(S
, E
);
7999 -- In any case the implicit operation remains hidden by the
8000 -- existing declaration, which is overriding. Indicate that
8001 -- E overrides the operation from which S is inherited.
8003 if Present
(Alias
(S
)) then
8004 Set_Overridden_Operation
(E
, Alias
(S
));
8006 Set_Overridden_Operation
(E
, S
);
8009 if Comes_From_Source
(E
) then
8010 Check_Overriding_Indicator
(E
, S
, Is_Primitive
=> False);
8015 -- Within an instance, the renaming declarations for actual
8016 -- subprograms may become ambiguous, but they do not hide each
8019 elsif Ekind
(E
) /= E_Entry
8020 and then not Comes_From_Source
(E
)
8021 and then not Is_Generic_Instance
(E
)
8022 and then (Present
(Alias
(E
))
8023 or else Is_Intrinsic_Subprogram
(E
))
8024 and then (not In_Instance
8025 or else No
(Parent
(E
))
8026 or else Nkind
(Unit_Declaration_Node
(E
)) /=
8027 N_Subprogram_Renaming_Declaration
)
8029 -- A subprogram child unit is not allowed to override an
8030 -- inherited subprogram (10.1.1(20)).
8032 if Is_Child_Unit
(S
) then
8034 ("child unit overrides inherited subprogram in parent",
8039 if Is_Non_Overriding_Operation
(E
, S
) then
8040 Enter_Overloaded_Entity
(S
);
8042 if No
(Derived_Type
)
8043 or else Is_Tagged_Type
(Derived_Type
)
8045 Check_Dispatching_Operation
(S
, Empty
);
8051 -- E is a derived operation or an internal operator which
8052 -- is being overridden. Remove E from further visibility.
8053 -- Furthermore, if E is a dispatching operation, it must be
8054 -- replaced in the list of primitive operations of its type
8055 -- (see Override_Dispatching_Operation).
8057 Overridden_Subp
:= E
;
8063 Prev
:= First_Entity
(Current_Scope
);
8064 while Present
(Prev
)
8065 and then Next_Entity
(Prev
) /= E
8070 -- It is possible for E to be in the current scope and
8071 -- yet not in the entity chain. This can only occur in a
8072 -- generic context where E is an implicit concatenation
8073 -- in the formal part, because in a generic body the
8074 -- entity chain starts with the formals.
8077 (Present
(Prev
) or else Chars
(E
) = Name_Op_Concat
);
8079 -- E must be removed both from the entity_list of the
8080 -- current scope, and from the visibility chain
8082 if Debug_Flag_E
then
8083 Write_Str
("Override implicit operation ");
8084 Write_Int
(Int
(E
));
8088 -- If E is a predefined concatenation, it stands for four
8089 -- different operations. As a result, a single explicit
8090 -- declaration does not hide it. In a possible ambiguous
8091 -- situation, Disambiguate chooses the user-defined op,
8092 -- so it is correct to retain the previous internal one.
8094 if Chars
(E
) /= Name_Op_Concat
8095 or else Ekind
(E
) /= E_Operator
8097 -- For nondispatching derived operations that are
8098 -- overridden by a subprogram declared in the private
8099 -- part of a package, we retain the derived subprogram
8100 -- but mark it as not immediately visible. If the
8101 -- derived operation was declared in the visible part
8102 -- then this ensures that it will still be visible
8103 -- outside the package with the proper signature
8104 -- (calls from outside must also be directed to this
8105 -- version rather than the overriding one, unlike the
8106 -- dispatching case). Calls from inside the package
8107 -- will still resolve to the overriding subprogram
8108 -- since the derived one is marked as not visible
8109 -- within the package.
8111 -- If the private operation is dispatching, we achieve
8112 -- the overriding by keeping the implicit operation
8113 -- but setting its alias to be the overriding one. In
8114 -- this fashion the proper body is executed in all
8115 -- cases, but the original signature is used outside
8118 -- If the overriding is not in the private part, we
8119 -- remove the implicit operation altogether.
8121 if Is_Private_Declaration
(S
) then
8122 if not Is_Dispatching_Operation
(E
) then
8123 Set_Is_Immediately_Visible
(E
, False);
8125 -- Work done in Override_Dispatching_Operation,
8126 -- so nothing else need to be done here.
8132 -- Find predecessor of E in Homonym chain
8134 if E
= Current_Entity
(E
) then
8137 Prev_Vis
:= Current_Entity
(E
);
8138 while Homonym
(Prev_Vis
) /= E
loop
8139 Prev_Vis
:= Homonym
(Prev_Vis
);
8143 if Prev_Vis
/= Empty
then
8145 -- Skip E in the visibility chain
8147 Set_Homonym
(Prev_Vis
, Homonym
(E
));
8150 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
8153 Set_Next_Entity
(Prev
, Next_Entity
(E
));
8155 if No
(Next_Entity
(Prev
)) then
8156 Set_Last_Entity
(Current_Scope
, Prev
);
8161 Enter_Overloaded_Entity
(S
);
8163 -- For entities generated by Derive_Subprograms the
8164 -- overridden operation is the inherited primitive
8165 -- (which is available through the attribute alias).
8167 if not (Comes_From_Source
(E
))
8168 and then Is_Dispatching_Operation
(E
)
8169 and then Find_Dispatching_Type
(E
) =
8170 Find_Dispatching_Type
(S
)
8171 and then Present
(Alias
(E
))
8172 and then Comes_From_Source
(Alias
(E
))
8174 Set_Overridden_Operation
(S
, Alias
(E
));
8176 Set_Overridden_Operation
(S
, E
);
8179 Check_Overriding_Indicator
(S
, E
, Is_Primitive
=> True);
8181 -- If S is a user-defined subprogram or a null procedure
8182 -- expanded to override an inherited null procedure, or a
8183 -- predefined dispatching primitive then indicate that E
8184 -- overrides the operation from which S is inherited.
8186 if Comes_From_Source
(S
)
8188 (Present
(Parent
(S
))
8190 Nkind
(Parent
(S
)) = N_Procedure_Specification
8192 Null_Present
(Parent
(S
)))
8194 (Present
(Alias
(E
))
8196 Is_Predefined_Dispatching_Operation
(Alias
(E
)))
8198 if Present
(Alias
(E
)) then
8199 Set_Overridden_Operation
(S
, Alias
(E
));
8203 if Is_Dispatching_Operation
(E
) then
8205 -- An overriding dispatching subprogram inherits the
8206 -- convention of the overridden subprogram (AI-117).
8208 Set_Convention
(S
, Convention
(E
));
8209 Check_Dispatching_Operation
(S
, E
);
8212 Check_Dispatching_Operation
(S
, Empty
);
8215 Check_For_Primitive_Subprogram
8216 (Is_Primitive_Subp
, Is_Overriding
=> True);
8217 goto Check_Inequality
;
8220 -- Apparent redeclarations in instances can occur when two
8221 -- formal types get the same actual type. The subprograms in
8222 -- in the instance are legal, even if not callable from the
8223 -- outside. Calls from within are disambiguated elsewhere.
8224 -- For dispatching operations in the visible part, the usual
8225 -- rules apply, and operations with the same profile are not
8228 elsif (In_Instance_Visible_Part
8229 and then not Is_Dispatching_Operation
(E
))
8230 or else In_Instance_Not_Visible
8234 -- Here we have a real error (identical profile)
8237 Error_Msg_Sloc
:= Sloc
(E
);
8239 -- Avoid cascaded errors if the entity appears in
8240 -- subsequent calls.
8242 Set_Scope
(S
, Current_Scope
);
8244 -- Generate error, with extra useful warning for the case
8245 -- of a generic instance with no completion.
8247 if Is_Generic_Instance
(S
)
8248 and then not Has_Completion
(E
)
8251 ("instantiation cannot provide body for&", S
);
8252 Error_Msg_N
("\& conflicts with declaration#", S
);
8254 Error_Msg_N
("& conflicts with declaration#", S
);
8261 -- If one subprogram has an access parameter and the other
8262 -- a parameter of an access type, calls to either might be
8263 -- ambiguous. Verify that parameters match except for the
8264 -- access parameter.
8266 if May_Hide_Profile
then
8272 F1
:= First_Formal
(S
);
8273 F2
:= First_Formal
(E
);
8274 while Present
(F1
) and then Present
(F2
) loop
8275 if Is_Access_Type
(Etype
(F1
)) then
8276 if not Is_Access_Type
(Etype
(F2
))
8277 or else not Conforming_Types
8278 (Designated_Type
(Etype
(F1
)),
8279 Designated_Type
(Etype
(F2
)),
8282 May_Hide_Profile
:= False;
8286 not Conforming_Types
8287 (Etype
(F1
), Etype
(F2
), Type_Conformant
)
8289 May_Hide_Profile
:= False;
8300 Error_Msg_NE
("calls to& may be ambiguous?", S
, S
);
8309 -- On exit, we know that S is a new entity
8311 Enter_Overloaded_Entity
(S
);
8312 Check_For_Primitive_Subprogram
(Is_Primitive_Subp
);
8313 Check_Overriding_Indicator
8314 (S
, Overridden_Subp
, Is_Primitive
=> Is_Primitive_Subp
);
8316 -- If S is a derived operation for an untagged type then by
8317 -- definition it's not a dispatching operation (even if the parent
8318 -- operation was dispatching), so we don't call
8319 -- Check_Dispatching_Operation in that case.
8321 if No
(Derived_Type
)
8322 or else Is_Tagged_Type
(Derived_Type
)
8324 Check_Dispatching_Operation
(S
, Empty
);
8328 -- If this is a user-defined equality operator that is not a derived
8329 -- subprogram, create the corresponding inequality. If the operation is
8330 -- dispatching, the expansion is done elsewhere, and we do not create
8331 -- an explicit inequality operation.
8333 <<Check_Inequality
>>
8334 if Chars
(S
) = Name_Op_Eq
8335 and then Etype
(S
) = Standard_Boolean
8336 and then Present
(Parent
(S
))
8337 and then not Is_Dispatching_Operation
(S
)
8339 Make_Inequality_Operator
(S
);
8341 if Ada_Version
>= Ada_2012
then
8342 Check_Untagged_Equality
(S
);
8345 end New_Overloaded_Entity
;
8347 ---------------------
8348 -- Process_Formals --
8349 ---------------------
8351 procedure Process_Formals
8353 Related_Nod
: Node_Id
)
8355 Param_Spec
: Node_Id
;
8357 Formal_Type
: Entity_Id
;
8361 Num_Out_Params
: Nat
:= 0;
8362 First_Out_Param
: Entity_Id
:= Empty
;
8363 -- Used for setting Is_Only_Out_Parameter
8365 function Designates_From_With_Type
(Typ
: Entity_Id
) return Boolean;
8366 -- Determine whether an access type designates a type coming from a
8369 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean;
8370 -- Check whether the default has a class-wide type. After analysis the
8371 -- default has the type of the formal, so we must also check explicitly
8372 -- for an access attribute.
8374 -------------------------------
8375 -- Designates_From_With_Type --
8376 -------------------------------
8378 function Designates_From_With_Type
(Typ
: Entity_Id
) return Boolean is
8379 Desig
: Entity_Id
:= Typ
;
8382 if Is_Access_Type
(Desig
) then
8383 Desig
:= Directly_Designated_Type
(Desig
);
8386 if Is_Class_Wide_Type
(Desig
) then
8387 Desig
:= Root_Type
(Desig
);
8391 Ekind
(Desig
) = E_Incomplete_Type
8392 and then From_With_Type
(Desig
);
8393 end Designates_From_With_Type
;
8395 ---------------------------
8396 -- Is_Class_Wide_Default --
8397 ---------------------------
8399 function Is_Class_Wide_Default
(D
: Node_Id
) return Boolean is
8401 return Is_Class_Wide_Type
(Designated_Type
(Etype
(D
)))
8402 or else (Nkind
(D
) = N_Attribute_Reference
8403 and then Attribute_Name
(D
) = Name_Access
8404 and then Is_Class_Wide_Type
(Etype
(Prefix
(D
))));
8405 end Is_Class_Wide_Default
;
8407 -- Start of processing for Process_Formals
8410 -- In order to prevent premature use of the formals in the same formal
8411 -- part, the Ekind is left undefined until all default expressions are
8412 -- analyzed. The Ekind is established in a separate loop at the end.
8414 Param_Spec
:= First
(T
);
8415 while Present
(Param_Spec
) loop
8416 Formal
:= Defining_Identifier
(Param_Spec
);
8417 Set_Never_Set_In_Source
(Formal
, True);
8418 Enter_Name
(Formal
);
8420 -- Case of ordinary parameters
8422 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
8423 Find_Type
(Parameter_Type
(Param_Spec
));
8424 Ptype
:= Parameter_Type
(Param_Spec
);
8426 if Ptype
= Error
then
8430 Formal_Type
:= Entity
(Ptype
);
8432 if Is_Incomplete_Type
(Formal_Type
)
8434 (Is_Class_Wide_Type
(Formal_Type
)
8435 and then Is_Incomplete_Type
(Root_Type
(Formal_Type
)))
8437 -- Ada 2005 (AI-326): Tagged incomplete types allowed in
8438 -- primitive operations, as long as their completion is
8439 -- in the same declarative part. If in the private part
8440 -- this means that the type cannot be a Taft-amendment type.
8441 -- Check is done on package exit. For access to subprograms,
8442 -- the use is legal for Taft-amendment types.
8444 if Is_Tagged_Type
(Formal_Type
) then
8445 if Ekind
(Scope
(Current_Scope
)) = E_Package
8446 and then In_Private_Part
(Scope
(Current_Scope
))
8447 and then not From_With_Type
(Formal_Type
)
8448 and then not Is_Class_Wide_Type
(Formal_Type
)
8451 (Parent
(T
), N_Access_Function_Definition
,
8452 N_Access_Procedure_Definition
)
8456 Private_Dependents
(Base_Type
(Formal_Type
)));
8460 -- Special handling of Value_Type for CIL case
8462 elsif Is_Value_Type
(Formal_Type
) then
8465 elsif not Nkind_In
(Parent
(T
), N_Access_Function_Definition
,
8466 N_Access_Procedure_Definition
)
8469 -- AI05-0151: Tagged incomplete types are allowed in all
8470 -- formal parts. Untagged incomplete types are not allowed
8473 if Ada_Version
>= Ada_2012
then
8474 if Is_Tagged_Type
(Formal_Type
) then
8477 elsif Nkind_In
(Parent
(Parent
(T
)), N_Accept_Statement
,
8482 ("invalid use of untagged incomplete type&",
8483 Ptype
, Formal_Type
);
8488 ("invalid use of incomplete type&",
8489 Param_Spec
, Formal_Type
);
8491 -- Further checks on the legality of incomplete types
8492 -- in formal parts are delayed until the freeze point
8493 -- of the enclosing subprogram or access to subprogram.
8497 elsif Ekind
(Formal_Type
) = E_Void
then
8499 ("premature use of&",
8500 Parameter_Type
(Param_Spec
), Formal_Type
);
8503 -- Ada 2005 (AI-231): Create and decorate an internal subtype
8504 -- declaration corresponding to the null-excluding type of the
8505 -- formal in the enclosing scope. Finally, replace the parameter
8506 -- type of the formal with the internal subtype.
8508 if Ada_Version
>= Ada_2005
8509 and then Null_Exclusion_Present
(Param_Spec
)
8511 if not Is_Access_Type
(Formal_Type
) then
8513 ("`NOT NULL` allowed only for an access type", Param_Spec
);
8516 if Can_Never_Be_Null
(Formal_Type
)
8517 and then Comes_From_Source
(Related_Nod
)
8520 ("`NOT NULL` not allowed (& already excludes null)",
8521 Param_Spec
, Formal_Type
);
8525 Create_Null_Excluding_Itype
8527 Related_Nod
=> Related_Nod
,
8528 Scope_Id
=> Scope
(Current_Scope
));
8530 -- If the designated type of the itype is an itype we
8531 -- decorate it with the Has_Delayed_Freeze attribute to
8532 -- avoid problems with the backend.
8535 -- type T is access procedure;
8536 -- procedure Op (O : not null T);
8538 if Is_Itype
(Directly_Designated_Type
(Formal_Type
)) then
8539 Set_Has_Delayed_Freeze
(Formal_Type
);
8544 -- An access formal type
8548 Access_Definition
(Related_Nod
, Parameter_Type
(Param_Spec
));
8550 -- No need to continue if we already notified errors
8552 if not Present
(Formal_Type
) then
8556 -- Ada 2005 (AI-254)
8559 AD
: constant Node_Id
:=
8560 Access_To_Subprogram_Definition
8561 (Parameter_Type
(Param_Spec
));
8563 if Present
(AD
) and then Protected_Present
(AD
) then
8565 Replace_Anonymous_Access_To_Protected_Subprogram
8571 Set_Etype
(Formal
, Formal_Type
);
8572 Default
:= Expression
(Param_Spec
);
8574 if Present
(Default
) then
8575 if Out_Present
(Param_Spec
) then
8577 ("default initialization only allowed for IN parameters",
8581 -- Do the special preanalysis of the expression (see section on
8582 -- "Handling of Default Expressions" in the spec of package Sem).
8584 Preanalyze_Spec_Expression
(Default
, Formal_Type
);
8586 -- An access to constant cannot be the default for
8587 -- an access parameter that is an access to variable.
8589 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
8590 and then not Is_Access_Constant
(Formal_Type
)
8591 and then Is_Access_Type
(Etype
(Default
))
8592 and then Is_Access_Constant
(Etype
(Default
))
8595 ("formal that is access to variable cannot be initialized " &
8596 "with an access-to-constant expression", Default
);
8599 -- Check that the designated type of an access parameter's default
8600 -- is not a class-wide type unless the parameter's designated type
8601 -- is also class-wide.
8603 if Ekind
(Formal_Type
) = E_Anonymous_Access_Type
8604 and then not Designates_From_With_Type
(Formal_Type
)
8605 and then Is_Class_Wide_Default
(Default
)
8606 and then not Is_Class_Wide_Type
(Designated_Type
(Formal_Type
))
8609 ("access to class-wide expression not allowed here", Default
);
8612 -- Check incorrect use of dynamically tagged expressions
8614 if Is_Tagged_Type
(Formal_Type
) then
8615 Check_Dynamically_Tagged_Expression
8618 Related_Nod
=> Default
);
8622 -- Ada 2005 (AI-231): Static checks
8624 if Ada_Version
>= Ada_2005
8625 and then Is_Access_Type
(Etype
(Formal
))
8626 and then Can_Never_Be_Null
(Etype
(Formal
))
8628 Null_Exclusion_Static_Checks
(Param_Spec
);
8635 -- If this is the formal part of a function specification, analyze the
8636 -- subtype mark in the context where the formals are visible but not
8637 -- yet usable, and may hide outer homographs.
8639 if Nkind
(Related_Nod
) = N_Function_Specification
then
8640 Analyze_Return_Type
(Related_Nod
);
8643 -- Now set the kind (mode) of each formal
8645 Param_Spec
:= First
(T
);
8646 while Present
(Param_Spec
) loop
8647 Formal
:= Defining_Identifier
(Param_Spec
);
8648 Set_Formal_Mode
(Formal
);
8650 if Ekind
(Formal
) = E_In_Parameter
then
8651 Set_Default_Value
(Formal
, Expression
(Param_Spec
));
8653 if Present
(Expression
(Param_Spec
)) then
8654 Default
:= Expression
(Param_Spec
);
8656 if Is_Scalar_Type
(Etype
(Default
)) then
8658 (Parameter_Type
(Param_Spec
)) /= N_Access_Definition
8660 Formal_Type
:= Entity
(Parameter_Type
(Param_Spec
));
8663 Formal_Type
:= Access_Definition
8664 (Related_Nod
, Parameter_Type
(Param_Spec
));
8667 Apply_Scalar_Range_Check
(Default
, Formal_Type
);
8671 elsif Ekind
(Formal
) = E_Out_Parameter
then
8672 Num_Out_Params
:= Num_Out_Params
+ 1;
8674 if Num_Out_Params
= 1 then
8675 First_Out_Param
:= Formal
;
8678 elsif Ekind
(Formal
) = E_In_Out_Parameter
then
8679 Num_Out_Params
:= Num_Out_Params
+ 1;
8685 if Present
(First_Out_Param
) and then Num_Out_Params
= 1 then
8686 Set_Is_Only_Out_Parameter
(First_Out_Param
);
8688 end Process_Formals
;
8694 procedure Process_PPCs
8696 Spec_Id
: Entity_Id
;
8697 Body_Id
: Entity_Id
)
8699 Loc
: constant Source_Ptr
:= Sloc
(N
);
8703 Designator
: Entity_Id
;
8704 -- Subprogram designator, set from Spec_Id if present, else Body_Id
8706 Precond
: Node_Id
:= Empty
;
8707 -- Set non-Empty if we prepend precondition to the declarations. This
8708 -- is used to hook up inherited preconditions (adding the condition
8709 -- expression with OR ELSE, and adding the message).
8711 Inherited_Precond
: Node_Id
;
8712 -- Precondition inherited from parent subprogram
8714 Inherited
: constant Subprogram_List
:=
8715 Inherited_Subprograms
(Spec_Id
);
8716 -- List of subprograms inherited by this subprogram
8718 Plist
: List_Id
:= No_List
;
8719 -- List of generated postconditions
8721 function Grab_PPC
(Pspec
: Entity_Id
:= Empty
) return Node_Id
;
8722 -- Prag contains an analyzed precondition or postcondition pragma. This
8723 -- function copies the pragma, changes it to the corresponding Check
8724 -- pragma and returns the Check pragma as the result. If Pspec is non-
8725 -- empty, this is the case of inheriting a PPC, where we must change
8726 -- references to parameters of the inherited subprogram to point to the
8727 -- corresponding parameters of the current subprogram.
8729 function Invariants_Or_Predicates_Present
return Boolean;
8730 -- Determines if any invariants or predicates are present for any OUT
8731 -- or IN OUT parameters of the subprogram, or (for a function) if the
8732 -- return value has an invariant.
8738 function Grab_PPC
(Pspec
: Entity_Id
:= Empty
) return Node_Id
is
8739 Nam
: constant Name_Id
:= Pragma_Name
(Prag
);
8744 -- Prepare map if this is the case where we have to map entities of
8745 -- arguments in the overridden subprogram to corresponding entities
8746 -- of the current subprogram.
8757 Map
:= New_Elmt_List
;
8758 PF
:= First_Formal
(Pspec
);
8759 CF
:= First_Formal
(Designator
);
8760 while Present
(PF
) loop
8761 Append_Elmt
(PF
, Map
);
8762 Append_Elmt
(CF
, Map
);
8769 -- Now we can copy the tree, doing any required substitutions
8771 CP
:= New_Copy_Tree
(Prag
, Map
=> Map
, New_Scope
=> Current_Scope
);
8773 -- Set Analyzed to false, since we want to reanalyze the check
8774 -- procedure. Note that it is only at the outer level that we
8775 -- do this fiddling, for the spec cases, the already preanalyzed
8776 -- parameters are not affected.
8778 Set_Analyzed
(CP
, False);
8780 -- We also make sure Comes_From_Source is False for the copy
8782 Set_Comes_From_Source
(CP
, False);
8784 -- For a postcondition pragma within a generic, preserve the pragma
8785 -- for later expansion.
8787 if Nam
= Name_Postcondition
8788 and then not Expander_Active
8793 -- Change copy of pragma into corresponding pragma Check
8795 Prepend_To
(Pragma_Argument_Associations
(CP
),
8796 Make_Pragma_Argument_Association
(Sloc
(Prag
),
8797 Expression
=> Make_Identifier
(Loc
, Nam
)));
8798 Set_Pragma_Identifier
(CP
, Make_Identifier
(Sloc
(Prag
), Name_Check
));
8800 -- If this is inherited case and the current message starts with
8801 -- "failed p", we change it to "failed inherited p...".
8803 if Present
(Pspec
) then
8805 Msg
: constant Node_Id
:=
8806 Last
(Pragma_Argument_Associations
(CP
));
8809 if Chars
(Msg
) = Name_Message
then
8810 String_To_Name_Buffer
(Strval
(Expression
(Msg
)));
8812 if Name_Buffer
(1 .. 8) = "failed p" then
8813 Insert_Str_In_Name_Buffer
("inherited ", 8);
8815 (Expression
(Last
(Pragma_Argument_Associations
(CP
))),
8816 String_From_Name_Buffer
);
8822 -- Return the check pragma
8827 --------------------------------------
8828 -- Invariants_Or_Predicates_Present --
8829 --------------------------------------
8831 function Invariants_Or_Predicates_Present
return Boolean is
8835 -- Check function return result
8837 if Ekind
(Designator
) /= E_Procedure
8838 and then Has_Invariants
(Etype
(Designator
))
8845 Formal
:= First_Formal
(Designator
);
8846 while Present
(Formal
) loop
8847 if Ekind
(Formal
) /= E_In_Parameter
8849 (Has_Invariants
(Etype
(Formal
))
8850 or else Present
(Predicate_Function
(Etype
(Formal
))))
8855 Next_Formal
(Formal
);
8859 end Invariants_Or_Predicates_Present
;
8861 -- Start of processing for Process_PPCs
8864 -- Capture designator from spec if present, else from body
8866 if Present
(Spec_Id
) then
8867 Designator
:= Spec_Id
;
8869 Designator
:= Body_Id
;
8872 -- Grab preconditions from spec
8874 if Present
(Spec_Id
) then
8876 -- Loop through PPC pragmas from spec. Note that preconditions from
8877 -- the body will be analyzed and converted when we scan the body
8878 -- declarations below.
8880 Prag
:= Spec_PPC_List
(Spec_Id
);
8881 while Present
(Prag
) loop
8882 if Pragma_Name
(Prag
) = Name_Precondition
then
8884 -- For Pre (or Precondition pragma), we simply prepend the
8885 -- pragma to the list of declarations right away so that it
8886 -- will be executed at the start of the procedure. Note that
8887 -- this processing reverses the order of the list, which is
8888 -- what we want since new entries were chained to the head of
8889 -- the list. There can be more then one precondition when we
8890 -- use pragma Precondition
8892 if not Class_Present
(Prag
) then
8893 Prepend
(Grab_PPC
, Declarations
(N
));
8895 -- For Pre'Class there can only be one pragma, and we save
8896 -- it in Precond for now. We will add inherited Pre'Class
8897 -- stuff before inserting this pragma in the declarations.
8899 Precond
:= Grab_PPC
;
8903 Prag
:= Next_Pragma
(Prag
);
8906 -- Now deal with inherited preconditions
8908 for J
in Inherited
'Range loop
8909 Prag
:= Spec_PPC_List
(Inherited
(J
));
8911 while Present
(Prag
) loop
8912 if Pragma_Name
(Prag
) = Name_Precondition
8913 and then Class_Present
(Prag
)
8915 Inherited_Precond
:= Grab_PPC
(Inherited
(J
));
8917 -- No precondition so far, so establish this as the first
8919 if No
(Precond
) then
8920 Precond
:= Inherited_Precond
;
8922 -- Here we already have a precondition, add inherited one
8925 -- Add new precondition to old one using OR ELSE
8928 New_Expr
: constant Node_Id
:=
8932 (Pragma_Argument_Associations
8933 (Inherited_Precond
))));
8934 Old_Expr
: constant Node_Id
:=
8938 (Pragma_Argument_Associations
8942 if Paren_Count
(Old_Expr
) = 0 then
8943 Set_Paren_Count
(Old_Expr
, 1);
8946 if Paren_Count
(New_Expr
) = 0 then
8947 Set_Paren_Count
(New_Expr
, 1);
8951 Make_Or_Else
(Sloc
(Old_Expr
),
8952 Left_Opnd
=> Relocate_Node
(Old_Expr
),
8953 Right_Opnd
=> New_Expr
));
8956 -- Add new message in the form:
8958 -- failed precondition from bla
8959 -- also failed inherited precondition from bla
8962 -- Skip this if exception locations are suppressed
8964 if not Exception_Locations_Suppressed
then
8966 New_Msg
: constant Node_Id
:=
8969 (Pragma_Argument_Associations
8970 (Inherited_Precond
)));
8971 Old_Msg
: constant Node_Id
:=
8974 (Pragma_Argument_Associations
8977 Start_String
(Strval
(Old_Msg
));
8978 Store_String_Chars
(ASCII
.LF
& " also ");
8979 Store_String_Chars
(Strval
(New_Msg
));
8980 Set_Strval
(Old_Msg
, End_String
);
8986 Prag
:= Next_Pragma
(Prag
);
8990 -- If we have built a precondition for Pre'Class (including any
8991 -- Pre'Class aspects inherited from parent subprograms), then we
8992 -- insert this composite precondition at this stage.
8994 if Present
(Precond
) then
8995 Prepend
(Precond
, Declarations
(N
));
8999 -- Build postconditions procedure if needed and prepend the following
9000 -- declaration to the start of the declarations for the subprogram.
9002 -- procedure _postconditions [(_Result : resulttype)] is
9004 -- pragma Check (Postcondition, condition [,message]);
9005 -- pragma Check (Postcondition, condition [,message]);
9007 -- Invariant_Procedure (_Result) ...
9008 -- Invariant_Procedure (Arg1)
9012 -- First we deal with the postconditions in the body
9014 if Is_Non_Empty_List
(Declarations
(N
)) then
9016 -- Loop through declarations
9018 Prag
:= First
(Declarations
(N
));
9019 while Present
(Prag
) loop
9020 if Nkind
(Prag
) = N_Pragma
then
9022 -- If pragma, capture if enabled postcondition, else ignore
9024 if Pragma_Name
(Prag
) = Name_Postcondition
9025 and then Check_Enabled
(Name_Postcondition
)
9027 if Plist
= No_List
then
9028 Plist
:= Empty_List
;
9033 -- If expansion is disabled, as in a generic unit, save
9034 -- pragma for later expansion.
9036 if not Expander_Active
then
9037 Prepend
(Grab_PPC
, Declarations
(N
));
9039 Append
(Grab_PPC
, Plist
);
9045 -- Not a pragma, if comes from source, then end scan
9047 elsif Comes_From_Source
(Prag
) then
9050 -- Skip stuff not coming from source
9058 -- Now deal with any postconditions from the spec
9060 if Present
(Spec_Id
) then
9061 Spec_Postconditions
: declare
9062 procedure Process_Post_Conditions
9065 -- This processes the Spec_PPC_List from Spec, processing any
9066 -- postconditions from the list. If Class is True, then only
9067 -- postconditions marked with Class_Present are considered.
9068 -- The caller has checked that Spec_PPC_List is non-Empty.
9070 -----------------------------
9071 -- Process_Post_Conditions --
9072 -----------------------------
9074 procedure Process_Post_Conditions
9087 -- Loop through PPC pragmas from spec
9089 Prag
:= Spec_PPC_List
(Spec
);
9091 if Pragma_Name
(Prag
) = Name_Postcondition
9092 and then (not Class
or else Class_Present
(Prag
))
9094 if Plist
= No_List
then
9095 Plist
:= Empty_List
;
9098 if not Expander_Active
then
9100 (Grab_PPC
(Pspec
), Declarations
(N
));
9102 Append
(Grab_PPC
(Pspec
), Plist
);
9106 Prag
:= Next_Pragma
(Prag
);
9107 exit when No
(Prag
);
9109 end Process_Post_Conditions
;
9111 -- Start of processing for Spec_Postconditions
9114 if Present
(Spec_PPC_List
(Spec_Id
)) then
9115 Process_Post_Conditions
(Spec_Id
, Class
=> False);
9118 -- Process inherited postconditions
9120 for J
in Inherited
'Range loop
9121 if Present
(Spec_PPC_List
(Inherited
(J
))) then
9122 Process_Post_Conditions
(Inherited
(J
), Class
=> True);
9125 end Spec_Postconditions
;
9128 -- If we had any postconditions and expansion is enabled, or if the
9129 -- procedure has invariants, then build the _Postconditions procedure.
9131 if (Present
(Plist
) or else Invariants_Or_Predicates_Present
)
9132 and then Expander_Active
9135 Plist
:= Empty_List
;
9138 -- Special processing for function case
9140 if Ekind
(Designator
) /= E_Procedure
then
9142 Rent
: constant Entity_Id
:=
9143 Make_Defining_Identifier
(Loc
,
9144 Chars
=> Name_uResult
);
9145 Ftyp
: constant Entity_Id
:= Etype
(Designator
);
9148 Set_Etype
(Rent
, Ftyp
);
9150 -- Add argument for return
9154 Make_Parameter_Specification
(Loc
,
9155 Parameter_Type
=> New_Occurrence_Of
(Ftyp
, Loc
),
9156 Defining_Identifier
=> Rent
));
9158 -- Add invariant call if returning type with invariants
9160 if Has_Invariants
(Etype
(Rent
))
9161 and then Present
(Invariant_Procedure
(Etype
(Rent
)))
9164 Make_Invariant_Call
(New_Occurrence_Of
(Rent
, Loc
)));
9168 -- Procedure rather than a function
9174 -- Add invariant calls and predicate calls for parameters. Note that
9175 -- this is done for functions as well, since in Ada 2012 they can
9176 -- have IN OUT args.
9183 Formal
:= First_Formal
(Designator
);
9184 while Present
(Formal
) loop
9185 if Ekind
(Formal
) /= E_In_Parameter
then
9186 Ftype
:= Etype
(Formal
);
9188 if Has_Invariants
(Ftype
)
9189 and then Present
(Invariant_Procedure
(Ftype
))
9193 (New_Occurrence_Of
(Formal
, Loc
)));
9196 if Present
(Predicate_Function
(Ftype
)) then
9198 Make_Predicate_Check
9199 (Ftype
, New_Occurrence_Of
(Formal
, Loc
)));
9203 Next_Formal
(Formal
);
9207 -- Build and insert postcondition procedure
9210 Post_Proc
: constant Entity_Id
:=
9211 Make_Defining_Identifier
(Loc
,
9212 Chars
=> Name_uPostconditions
);
9213 -- The entity for the _Postconditions procedure
9216 Prepend_To
(Declarations
(N
),
9217 Make_Subprogram_Body
(Loc
,
9219 Make_Procedure_Specification
(Loc
,
9220 Defining_Unit_Name
=> Post_Proc
,
9221 Parameter_Specifications
=> Parms
),
9223 Declarations
=> Empty_List
,
9225 Handled_Statement_Sequence
=>
9226 Make_Handled_Sequence_Of_Statements
(Loc
,
9227 Statements
=> Plist
)));
9229 -- If this is a procedure, set the Postcondition_Proc attribute on
9230 -- the proper defining entity for the subprogram.
9232 if Ekind
(Designator
) = E_Procedure
then
9233 Set_Postcondition_Proc
(Designator
, Post_Proc
);
9237 Set_Has_Postconditions
(Designator
);
9241 ----------------------------
9242 -- Reference_Body_Formals --
9243 ----------------------------
9245 procedure Reference_Body_Formals
(Spec
: Entity_Id
; Bod
: Entity_Id
) is
9250 if Error_Posted
(Spec
) then
9254 -- Iterate over both lists. They may be of different lengths if the two
9255 -- specs are not conformant.
9257 Fs
:= First_Formal
(Spec
);
9258 Fb
:= First_Formal
(Bod
);
9259 while Present
(Fs
) and then Present
(Fb
) loop
9260 Generate_Reference
(Fs
, Fb
, 'b');
9263 Style
.Check_Identifier
(Fb
, Fs
);
9266 Set_Spec_Entity
(Fb
, Fs
);
9267 Set_Referenced
(Fs
, False);
9271 end Reference_Body_Formals
;
9273 -------------------------
9274 -- Set_Actual_Subtypes --
9275 -------------------------
9277 procedure Set_Actual_Subtypes
(N
: Node_Id
; Subp
: Entity_Id
) is
9281 First_Stmt
: Node_Id
:= Empty
;
9282 AS_Needed
: Boolean;
9285 -- If this is an empty initialization procedure, no need to create
9286 -- actual subtypes (small optimization).
9288 if Ekind
(Subp
) = E_Procedure
9289 and then Is_Null_Init_Proc
(Subp
)
9294 Formal
:= First_Formal
(Subp
);
9295 while Present
(Formal
) loop
9296 T
:= Etype
(Formal
);
9298 -- We never need an actual subtype for a constrained formal
9300 if Is_Constrained
(T
) then
9303 -- If we have unknown discriminants, then we do not need an actual
9304 -- subtype, or more accurately we cannot figure it out! Note that
9305 -- all class-wide types have unknown discriminants.
9307 elsif Has_Unknown_Discriminants
(T
) then
9310 -- At this stage we have an unconstrained type that may need an
9311 -- actual subtype. For sure the actual subtype is needed if we have
9312 -- an unconstrained array type.
9314 elsif Is_Array_Type
(T
) then
9317 -- The only other case needing an actual subtype is an unconstrained
9318 -- record type which is an IN parameter (we cannot generate actual
9319 -- subtypes for the OUT or IN OUT case, since an assignment can
9320 -- change the discriminant values. However we exclude the case of
9321 -- initialization procedures, since discriminants are handled very
9322 -- specially in this context, see the section entitled "Handling of
9323 -- Discriminants" in Einfo.
9325 -- We also exclude the case of Discrim_SO_Functions (functions used
9326 -- in front end layout mode for size/offset values), since in such
9327 -- functions only discriminants are referenced, and not only are such
9328 -- subtypes not needed, but they cannot always be generated, because
9329 -- of order of elaboration issues.
9331 elsif Is_Record_Type
(T
)
9332 and then Ekind
(Formal
) = E_In_Parameter
9333 and then Chars
(Formal
) /= Name_uInit
9334 and then not Is_Unchecked_Union
(T
)
9335 and then not Is_Discrim_SO_Function
(Subp
)
9339 -- All other cases do not need an actual subtype
9345 -- Generate actual subtypes for unconstrained arrays and
9346 -- unconstrained discriminated records.
9349 if Nkind
(N
) = N_Accept_Statement
then
9351 -- If expansion is active, The formal is replaced by a local
9352 -- variable that renames the corresponding entry of the
9353 -- parameter block, and it is this local variable that may
9354 -- require an actual subtype.
9356 if Expander_Active
then
9357 Decl
:= Build_Actual_Subtype
(T
, Renamed_Object
(Formal
));
9359 Decl
:= Build_Actual_Subtype
(T
, Formal
);
9362 if Present
(Handled_Statement_Sequence
(N
)) then
9364 First
(Statements
(Handled_Statement_Sequence
(N
)));
9365 Prepend
(Decl
, Statements
(Handled_Statement_Sequence
(N
)));
9366 Mark_Rewrite_Insertion
(Decl
);
9368 -- If the accept statement has no body, there will be no
9369 -- reference to the actuals, so no need to compute actual
9376 Decl
:= Build_Actual_Subtype
(T
, Formal
);
9377 Prepend
(Decl
, Declarations
(N
));
9378 Mark_Rewrite_Insertion
(Decl
);
9381 -- The declaration uses the bounds of an existing object, and
9382 -- therefore needs no constraint checks.
9384 Analyze
(Decl
, Suppress
=> All_Checks
);
9386 -- We need to freeze manually the generated type when it is
9387 -- inserted anywhere else than in a declarative part.
9389 if Present
(First_Stmt
) then
9390 Insert_List_Before_And_Analyze
(First_Stmt
,
9391 Freeze_Entity
(Defining_Identifier
(Decl
), N
));
9394 if Nkind
(N
) = N_Accept_Statement
9395 and then Expander_Active
9397 Set_Actual_Subtype
(Renamed_Object
(Formal
),
9398 Defining_Identifier
(Decl
));
9400 Set_Actual_Subtype
(Formal
, Defining_Identifier
(Decl
));
9404 Next_Formal
(Formal
);
9406 end Set_Actual_Subtypes
;
9408 ---------------------
9409 -- Set_Formal_Mode --
9410 ---------------------
9412 procedure Set_Formal_Mode
(Formal_Id
: Entity_Id
) is
9413 Spec
: constant Node_Id
:= Parent
(Formal_Id
);
9416 -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters
9417 -- since we ensure that corresponding actuals are always valid at the
9418 -- point of the call.
9420 if Out_Present
(Spec
) then
9421 if Ekind
(Scope
(Formal_Id
)) = E_Function
9422 or else Ekind
(Scope
(Formal_Id
)) = E_Generic_Function
9424 -- [IN] OUT parameters allowed for functions in Ada 2012
9426 if Ada_Version
>= Ada_2012
then
9427 if In_Present
(Spec
) then
9428 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
9430 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
9433 -- But not in earlier versions of Ada
9436 Error_Msg_N
("functions can only have IN parameters", Spec
);
9437 Set_Ekind
(Formal_Id
, E_In_Parameter
);
9440 elsif In_Present
(Spec
) then
9441 Set_Ekind
(Formal_Id
, E_In_Out_Parameter
);
9444 Set_Ekind
(Formal_Id
, E_Out_Parameter
);
9445 Set_Never_Set_In_Source
(Formal_Id
, True);
9446 Set_Is_True_Constant
(Formal_Id
, False);
9447 Set_Current_Value
(Formal_Id
, Empty
);
9451 Set_Ekind
(Formal_Id
, E_In_Parameter
);
9454 -- Set Is_Known_Non_Null for access parameters since the language
9455 -- guarantees that access parameters are always non-null. We also set
9456 -- Can_Never_Be_Null, since there is no way to change the value.
9458 if Nkind
(Parameter_Type
(Spec
)) = N_Access_Definition
then
9460 -- Ada 2005 (AI-231): In Ada95, access parameters are always non-
9461 -- null; In Ada 2005, only if then null_exclusion is explicit.
9463 if Ada_Version
< Ada_2005
9464 or else Can_Never_Be_Null
(Etype
(Formal_Id
))
9466 Set_Is_Known_Non_Null
(Formal_Id
);
9467 Set_Can_Never_Be_Null
(Formal_Id
);
9470 -- Ada 2005 (AI-231): Null-exclusion access subtype
9472 elsif Is_Access_Type
(Etype
(Formal_Id
))
9473 and then Can_Never_Be_Null
(Etype
(Formal_Id
))
9475 Set_Is_Known_Non_Null
(Formal_Id
);
9478 Set_Mechanism
(Formal_Id
, Default_Mechanism
);
9479 Set_Formal_Validity
(Formal_Id
);
9480 end Set_Formal_Mode
;
9482 -------------------------
9483 -- Set_Formal_Validity --
9484 -------------------------
9486 procedure Set_Formal_Validity
(Formal_Id
: Entity_Id
) is
9488 -- If no validity checking, then we cannot assume anything about the
9489 -- validity of parameters, since we do not know there is any checking
9490 -- of the validity on the call side.
9492 if not Validity_Checks_On
then
9495 -- If validity checking for parameters is enabled, this means we are
9496 -- not supposed to make any assumptions about argument values.
9498 elsif Validity_Check_Parameters
then
9501 -- If we are checking in parameters, we will assume that the caller is
9502 -- also checking parameters, so we can assume the parameter is valid.
9504 elsif Ekind
(Formal_Id
) = E_In_Parameter
9505 and then Validity_Check_In_Params
9507 Set_Is_Known_Valid
(Formal_Id
, True);
9509 -- Similar treatment for IN OUT parameters
9511 elsif Ekind
(Formal_Id
) = E_In_Out_Parameter
9512 and then Validity_Check_In_Out_Params
9514 Set_Is_Known_Valid
(Formal_Id
, True);
9516 end Set_Formal_Validity
;
9518 ------------------------
9519 -- Subtype_Conformant --
9520 ------------------------
9522 function Subtype_Conformant
9523 (New_Id
: Entity_Id
;
9525 Skip_Controlling_Formals
: Boolean := False) return Boolean
9529 Check_Conformance
(New_Id
, Old_Id
, Subtype_Conformant
, False, Result
,
9530 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
9532 end Subtype_Conformant
;
9534 ---------------------
9535 -- Type_Conformant --
9536 ---------------------
9538 function Type_Conformant
9539 (New_Id
: Entity_Id
;
9541 Skip_Controlling_Formals
: Boolean := False) return Boolean
9545 May_Hide_Profile
:= False;
9548 (New_Id
, Old_Id
, Type_Conformant
, False, Result
,
9549 Skip_Controlling_Formals
=> Skip_Controlling_Formals
);
9551 end Type_Conformant
;
9553 -------------------------------
9554 -- Valid_Operator_Definition --
9555 -------------------------------
9557 procedure Valid_Operator_Definition
(Designator
: Entity_Id
) is
9560 Id
: constant Name_Id
:= Chars
(Designator
);
9564 F
:= First_Formal
(Designator
);
9565 while Present
(F
) loop
9568 if Present
(Default_Value
(F
)) then
9570 ("default values not allowed for operator parameters",
9577 -- Verify that user-defined operators have proper number of arguments
9578 -- First case of operators which can only be unary
9581 or else Id
= Name_Op_Abs
9585 -- Case of operators which can be unary or binary
9587 elsif Id
= Name_Op_Add
9588 or Id
= Name_Op_Subtract
9590 N_OK
:= (N
in 1 .. 2);
9592 -- All other operators can only be binary
9600 ("incorrect number of arguments for operator", Designator
);
9604 and then Base_Type
(Etype
(Designator
)) = Standard_Boolean
9605 and then not Is_Intrinsic_Subprogram
(Designator
)
9608 ("explicit definition of inequality not allowed", Designator
);
9610 end Valid_Operator_Definition
;