1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, 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 Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Exp_Disp
; use Exp_Disp
;
32 with Fname
; use Fname
;
34 with Namet
; use Namet
;
35 with Nlists
; use Nlists
;
38 with Sem_Attr
; use Sem_Attr
;
39 with Sem_Aux
; use Sem_Aux
;
40 with Sem_Dist
; use Sem_Dist
;
41 with Sem_Eval
; use Sem_Eval
;
42 with Sem_Util
; use Sem_Util
;
43 with Sinfo
; use Sinfo
;
44 with Snames
; use Snames
;
45 with Stand
; use Stand
;
47 package body Sem_Cat
is
49 -----------------------
50 -- Local Subprograms --
51 -----------------------
53 procedure Check_Categorization_Dependencies
54 (Unit_Entity
: Entity_Id
;
55 Depended_Entity
: Entity_Id
;
57 Is_Subunit
: Boolean);
58 -- This procedure checks that the categorization of a lib unit and that
59 -- of the depended unit satisfy dependency restrictions.
60 -- The depended_entity can be the entity in a with_clause item, in which
61 -- case Info_Node denotes that item. The depended_entity can also be the
62 -- parent unit of a child unit, in which case Info_Node is the declaration
63 -- of the child unit. The error message is posted on Info_Node, and is
64 -- specialized if Is_Subunit is true.
66 procedure Check_Non_Static_Default_Expr
69 -- Iterate through the component list of a record definition, check
70 -- that no component is declared with a nonstatic default value.
71 -- If a nonstatic default exists, report an error on Obj_Decl.
73 function Has_Read_Write_Attributes
(E
: Entity_Id
) return Boolean;
74 -- Return True if entity has attribute definition clauses for Read and
75 -- Write attributes that are visible at some place.
77 function Is_Non_Remote_Access_Type
(E
: Entity_Id
) return Boolean;
78 -- Returns true if the entity is a type whose full view is a non-remote
79 -- access type, for the purpose of enforcing E.2.2(8) rules.
81 function Has_Non_Remote_Access
(Typ
: Entity_Id
) return Boolean;
82 -- Return true if Typ or the type of any of its subcomponents is a non
83 -- remote access type and doesn't have user-defined stream attributes.
85 function No_External_Streaming
(E
: Entity_Id
) return Boolean;
86 -- Return True if the entity or one of its subcomponents does not support
87 -- external streaming.
89 function In_RCI_Declaration
return Boolean;
90 function In_RT_Declaration
return Boolean;
91 -- Determine if current scope is within the declaration of a Remote Call
92 -- Interface or Remote Types unit, for semantic checking purposes.
94 function In_Package_Declaration
return Boolean;
95 -- Shared supporting routine for In_RCI_Declaration and In_RT_Declaration
97 function In_Shared_Passive_Unit
return Boolean;
98 -- Determines if current scope is within a Shared Passive compilation unit
100 function Static_Discriminant_Expr
(L
: List_Id
) return Boolean;
101 -- Iterate through the list of discriminants to check if any of them
102 -- contains non-static default expression, which is a violation in
103 -- a preelaborated library unit.
105 procedure Validate_Remote_Access_Object_Type_Declaration
(T
: Entity_Id
);
106 -- Check validity of declaration if RCI or RT unit. It should not contain
107 -- the declaration of an access-to-object type unless it is a general
108 -- access type that designates a class-wide limited private type. There are
109 -- also constraints about the primitive subprograms of the class-wide type.
110 -- RM E.2 (9, 13, 14)
112 procedure Validate_RACW_Primitive
115 -- Check legality of the declaration of primitive Subp of the designated
116 -- type of the given RACW type.
118 ---------------------------------------
119 -- Check_Categorization_Dependencies --
120 ---------------------------------------
122 procedure Check_Categorization_Dependencies
123 (Unit_Entity
: Entity_Id
;
124 Depended_Entity
: Entity_Id
;
126 Is_Subunit
: Boolean)
128 N
: constant Node_Id
:= Info_Node
;
131 -- Here we define an enumeration type to represent categorization types,
132 -- ordered so that a unit with a given categorization can only WITH
133 -- units with lower or equal categorization type.
135 type Categorization
is
139 Remote_Call_Interface
,
142 function Get_Categorization
(E
: Entity_Id
) return Categorization
;
143 -- Check categorization flags from entity, and return in the form
144 -- of the lowest value of the Categorization type that applies to E.
146 ------------------------
147 -- Get_Categorization --
148 ------------------------
150 function Get_Categorization
(E
: Entity_Id
) return Categorization
is
152 -- Get the lowest categorization that corresponds to E. Note that
153 -- nothing prevents several (different) categorization pragmas
154 -- to apply to the same library unit, in which case the unit has
155 -- all associated categories, so we need to be careful here to
156 -- check pragmas in proper Categorization order in order to
157 -- return the lowest applicable value.
159 -- Ignore Pure specification if set by pragma Pure_Function
163 (Has_Pragma_Pure_Function
(E
) and not Has_Pragma_Pure
(E
))
167 elsif Is_Shared_Passive
(E
) then
168 return Shared_Passive
;
170 elsif Is_Remote_Types
(E
) then
173 elsif Is_Remote_Call_Interface
(E
) then
174 return Remote_Call_Interface
;
179 end Get_Categorization
;
181 Unit_Category
: Categorization
;
182 With_Category
: Categorization
;
184 -- Start of processing for Check_Categorization_Dependencies
187 -- Intrinsic subprograms are preelaborated, so do not impose any
188 -- categorization dependencies.
190 if Is_Intrinsic_Subprogram
(Depended_Entity
) then
194 -- First check 10.2.1 (11/1) rules on preelaborate packages
196 if Is_Preelaborated
(Unit_Entity
)
197 and then not Is_Preelaborated
(Depended_Entity
)
198 and then not Is_Pure
(Depended_Entity
)
205 -- Check categorization rules of RM E.2(5)
207 Unit_Category
:= Get_Categorization
(Unit_Entity
);
208 With_Category
:= Get_Categorization
(Depended_Entity
);
210 if With_Category
> Unit_Category
then
212 -- Special case: Remote_Types and Remote_Call_Interface are allowed
213 -- to WITH anything in the package body, per (RM E.2(5)).
215 if (Unit_Category
= Remote_Types
216 or else Unit_Category
= Remote_Call_Interface
)
217 and then In_Package_Body
(Unit_Entity
)
221 -- Special case: Remote_Types and Remote_Call_Interface declarations
222 -- can depend on a preelaborated unit via a private with_clause, per
225 elsif (Unit_Category
= Remote_Types
227 Unit_Category
= Remote_Call_Interface
)
228 and then Nkind
(N
) = N_With_Clause
229 and then Private_Present
(N
)
230 and then Is_Preelaborated
(Depended_Entity
)
234 -- All other cases, we do have an error
241 -- Here if we have an error
245 -- These messages are warnings in GNAT mode or if the -gnateP switch
246 -- was set. Otherwise these are real errors for real illegalities.
248 -- The reason we suppress these errors in GNAT mode is that the run-
249 -- time has several instances of violations of the categorization
250 -- errors (e.g. Pure units withing Preelaborate units. All these
251 -- violations are harmless in the cases where we intend them, and
252 -- we suppress the warnings with Warnings (Off). In cases where we
253 -- do not intend the violation, warnings are errors in GNAT mode
254 -- anyway, so we will still get an error.
257 Treat_Categorization_Errors_As_Warnings
or GNAT_Mode
;
259 -- Don't give error if main unit is not an internal unit, and the
260 -- unit generating the message is an internal unit. This is the
261 -- situation in which such messages would be ignored in any case,
262 -- so it is convenient not to generate them (since it causes
263 -- annoying interference with debugging).
265 if Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
266 and then not Is_Internal_File_Name
(Unit_File_Name
(Main_Unit
))
270 -- Dependence of Remote_Types or Remote_Call_Interface declaration
271 -- on a preelaborated unit with a normal with_clause.
273 elsif (Unit_Category
= Remote_Types
275 Unit_Category
= Remote_Call_Interface
)
276 and then Is_Preelaborated
(Depended_Entity
)
279 ("<<must use private with clause for preelaborated unit& ",
284 elsif Is_Subunit
then
286 ("<subunit cannot depend on& " &
287 "(parent has wrong categorization)", N
, Depended_Entity
);
289 -- Normal unit, not subunit
293 ("<<cannot depend on& " &
294 "(wrong categorization)", N
, Depended_Entity
);
297 -- Add further explanation for Pure/Preelaborate common cases
299 if Unit_Category
= Pure
then
301 ("\<<pure unit cannot depend on non-pure unit",
304 elsif Is_Preelaborated
(Unit_Entity
)
305 and then not Is_Preelaborated
(Depended_Entity
)
306 and then not Is_Pure
(Depended_Entity
)
309 ("\<<preelaborated unit cannot depend on "
310 & "non-preelaborated unit",
314 end Check_Categorization_Dependencies
;
316 -----------------------------------
317 -- Check_Non_Static_Default_Expr --
318 -----------------------------------
320 procedure Check_Non_Static_Default_Expr
325 Component_Decl
: Node_Id
;
328 if Nkind
(Type_Def
) = N_Derived_Type_Definition
then
329 Recdef
:= Record_Extension_Part
(Type_Def
);
339 -- Check that component declarations do not involve:
341 -- a. a non-static default expression, where the object is
342 -- declared to be default initialized.
344 -- b. a dynamic Itype (discriminants and constraints)
346 if Null_Present
(Recdef
) then
349 Component_Decl
:= First
(Component_Items
(Component_List
(Recdef
)));
352 while Present
(Component_Decl
)
353 and then Nkind
(Component_Decl
) = N_Component_Declaration
355 if Present
(Expression
(Component_Decl
))
356 and then Nkind
(Expression
(Component_Decl
)) /= N_Null
357 and then not Is_OK_Static_Expression
(Expression
(Component_Decl
))
359 Error_Msg_Sloc
:= Sloc
(Component_Decl
);
361 ("object in preelaborated unit has non-static default#",
364 -- Fix this later ???
366 -- elsif Has_Dynamic_Itype (Component_Decl) then
368 -- ("dynamic type discriminant," &
369 -- " constraint in preelaborated unit",
373 Next
(Component_Decl
);
375 end Check_Non_Static_Default_Expr
;
377 ---------------------------
378 -- Has_Non_Remote_Access --
379 ---------------------------
381 function Has_Non_Remote_Access
(Typ
: Entity_Id
) return Boolean is
382 Component
: Entity_Id
;
383 Comp_Type
: Entity_Id
;
384 U_Typ
: constant Entity_Id
:= Underlying_Type
(Typ
);
390 elsif Has_Read_Write_Attributes
(Typ
)
391 or else Has_Read_Write_Attributes
(U_Typ
)
395 elsif Is_Non_Remote_Access_Type
(U_Typ
) then
399 if Is_Record_Type
(U_Typ
) then
400 Component
:= First_Entity
(U_Typ
);
401 while Present
(Component
) loop
402 if not Is_Tag
(Component
) then
403 Comp_Type
:= Etype
(Component
);
405 if Has_Non_Remote_Access
(Comp_Type
) then
410 Next_Entity
(Component
);
413 elsif Is_Array_Type
(U_Typ
) then
414 return Has_Non_Remote_Access
(Component_Type
(U_Typ
));
419 end Has_Non_Remote_Access
;
421 -------------------------------
422 -- Has_Read_Write_Attributes --
423 -------------------------------
425 function Has_Read_Write_Attributes
(E
: Entity_Id
) return Boolean is
428 and then Has_Stream_Attribute_Definition
429 (E
, TSS_Stream_Read
, At_Any_Place
=> True)
430 and then Has_Stream_Attribute_Definition
431 (E
, TSS_Stream_Write
, At_Any_Place
=> True);
432 end Has_Read_Write_Attributes
;
434 -------------------------------------
435 -- Has_Stream_Attribute_Definition --
436 -------------------------------------
438 function Has_Stream_Attribute_Definition
441 At_Any_Place
: Boolean := False) return Boolean
444 Full_Type
: Entity_Id
:= Typ
;
447 -- In the case of a type derived from a private view, any specified
448 -- stream attributes will be attached to the derived type's underlying
449 -- type rather the derived type entity itself (which is itself private).
451 if Is_Private_Type
(Typ
)
452 and then Is_Derived_Type
(Typ
)
453 and then Present
(Full_View
(Typ
))
455 Full_Type
:= Underlying_Type
(Typ
);
458 -- We start from the declaration node and then loop until the end of
459 -- the list until we find the requested attribute definition clause.
460 -- In Ada 2005 mode, clauses are ignored if they are not currently
461 -- visible (this is tested using the corresponding Entity, which is
462 -- inserted by the expander at the point where the clause occurs),
463 -- unless At_Any_Place is true.
465 Rep_Item
:= First_Rep_Item
(Full_Type
);
466 while Present
(Rep_Item
) loop
467 if Nkind
(Rep_Item
) = N_Attribute_Definition_Clause
then
468 case Chars
(Rep_Item
) is
470 exit when Nam
= TSS_Stream_Read
;
473 exit when Nam
= TSS_Stream_Write
;
476 exit when Nam
= TSS_Stream_Input
;
479 exit when Nam
= TSS_Stream_Output
;
487 Next_Rep_Item
(Rep_Item
);
490 -- If At_Any_Place is true, return True if the attribute is available
491 -- at any place; if it is false, return True only if the attribute is
492 -- currently visible.
494 return Present
(Rep_Item
)
495 and then (Ada_Version
< Ada_2005
497 or else not Is_Hidden
(Entity
(Rep_Item
)));
498 end Has_Stream_Attribute_Definition
;
500 ----------------------------
501 -- In_Package_Declaration --
502 ----------------------------
504 function In_Package_Declaration
return Boolean is
505 Unit_Kind
: constant Node_Kind
:=
506 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
509 -- There are no restrictions on the body of an RCI or RT unit
511 return Is_Package_Or_Generic_Package
(Current_Scope
)
512 and then Unit_Kind
/= N_Package_Body
513 and then not In_Package_Body
(Current_Scope
)
514 and then not In_Instance
;
515 end In_Package_Declaration
;
517 ---------------------------
518 -- In_Preelaborated_Unit --
519 ---------------------------
521 function In_Preelaborated_Unit
return Boolean is
522 Unit_Entity
: Entity_Id
:= Current_Scope
;
523 Unit_Kind
: constant Node_Kind
:=
524 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
527 -- If evaluating actuals for a child unit instantiation, then ignore
528 -- the preelaboration status of the parent; use the child instead.
530 if Is_Compilation_Unit
(Unit_Entity
)
531 and then Unit_Kind
in N_Generic_Instantiation
532 and then not In_Same_Source_Unit
(Unit_Entity
,
533 Cunit
(Current_Sem_Unit
))
535 Unit_Entity
:= Cunit_Entity
(Current_Sem_Unit
);
538 -- There are no constraints on the body of Remote_Call_Interface or
539 -- Remote_Types packages.
541 return (Unit_Entity
/= Standard_Standard
)
542 and then (Is_Preelaborated
(Unit_Entity
)
543 or else Is_Pure
(Unit_Entity
)
544 or else Is_Shared_Passive
(Unit_Entity
)
546 ((Is_Remote_Types
(Unit_Entity
)
547 or else Is_Remote_Call_Interface
(Unit_Entity
))
548 and then Ekind
(Unit_Entity
) = E_Package
549 and then Unit_Kind
/= N_Package_Body
550 and then not In_Package_Body
(Unit_Entity
)
551 and then not In_Instance
));
552 end In_Preelaborated_Unit
;
558 function In_Pure_Unit
return Boolean is
560 return Is_Pure
(Current_Scope
);
563 ------------------------
564 -- In_RCI_Declaration --
565 ------------------------
567 function In_RCI_Declaration
return Boolean is
569 return Is_Remote_Call_Interface
(Current_Scope
)
570 and then In_Package_Declaration
;
571 end In_RCI_Declaration
;
573 -----------------------
574 -- In_RT_Declaration --
575 -----------------------
577 function In_RT_Declaration
return Boolean is
579 return Is_Remote_Types
(Current_Scope
) and then In_Package_Declaration
;
580 end In_RT_Declaration
;
582 ----------------------------
583 -- In_Shared_Passive_Unit --
584 ----------------------------
586 function In_Shared_Passive_Unit
return Boolean is
587 Unit_Entity
: constant Entity_Id
:= Current_Scope
;
590 return Is_Shared_Passive
(Unit_Entity
);
591 end In_Shared_Passive_Unit
;
593 ---------------------------------------
594 -- In_Subprogram_Task_Protected_Unit --
595 ---------------------------------------
597 function In_Subprogram_Task_Protected_Unit
return Boolean is
601 -- The following is to verify that a declaration is inside
602 -- subprogram, generic subprogram, task unit, protected unit.
603 -- Used to validate if a lib. unit is Pure. RM 10.2.1(16).
605 -- Use scope chain to check successively outer scopes
609 if Is_Subprogram_Or_Generic_Subprogram
(E
)
611 Is_Concurrent_Type
(E
)
615 elsif E
= Standard_Standard
then
621 end In_Subprogram_Task_Protected_Unit
;
623 -------------------------------
624 -- Is_Non_Remote_Access_Type --
625 -------------------------------
627 function Is_Non_Remote_Access_Type
(E
: Entity_Id
) return Boolean is
628 U_E
: constant Entity_Id
:= Underlying_Type
(Base_Type
(E
));
629 -- Use full view of base type to handle subtypes properly.
634 -- This case arises for the case of a generic formal type, in which
635 -- case E.2.2(8) rules will be enforced at instantiation time.
640 return Is_Access_Type
(U_E
)
641 and then not Is_Remote_Access_To_Class_Wide_Type
(U_E
)
642 and then not Is_Remote_Access_To_Subprogram_Type
(U_E
);
643 end Is_Non_Remote_Access_Type
;
645 ---------------------------
646 -- No_External_Streaming --
647 ---------------------------
649 function No_External_Streaming
(E
: Entity_Id
) return Boolean is
650 U_E
: constant Entity_Id
:= Underlying_Type
(E
);
656 elsif Has_Read_Write_Attributes
(E
) then
658 -- Note: availability of stream attributes is tested on E, not U_E.
659 -- There may be stream attributes defined on U_E that are not visible
660 -- at the place where support of external streaming is tested.
664 elsif Has_Non_Remote_Access
(U_E
) then
668 return Is_Limited_Type
(E
);
669 end No_External_Streaming
;
671 -------------------------------------
672 -- Set_Categorization_From_Pragmas --
673 -------------------------------------
675 procedure Set_Categorization_From_Pragmas
(N
: Node_Id
) is
676 P
: constant Node_Id
:= Parent
(N
);
677 S
: constant Entity_Id
:= Current_Scope
;
679 procedure Set_Parents
(Visibility
: Boolean);
680 -- If this is a child instance, the parents are not immediately
681 -- visible during analysis. Make them momentarily visible so that
682 -- the argument of the pragma can be resolved properly, and reset
689 procedure Set_Parents
(Visibility
: Boolean) is
693 while Present
(Par
) and then Par
/= Standard_Standard
loop
694 Set_Is_Immediately_Visible
(Par
, Visibility
);
699 -- Start of processing for Set_Categorization_From_Pragmas
702 -- Deal with categorization pragmas in Pragmas of Compilation_Unit.
703 -- The purpose is to set categorization flags before analyzing the
704 -- unit itself, so as to diagnose violations of categorization as
705 -- we process each declaration, even though the pragma appears after
708 if Nkind
(P
) /= N_Compilation_Unit
then
716 if Is_Child_Unit
(S
) and then Is_Generic_Instance
(S
) then
720 PN
:= First
(Pragmas_After
(Aux_Decls_Node
(P
)));
721 while Present
(PN
) loop
723 -- Skip implicit types that may have been introduced by
724 -- previous analysis.
726 if Nkind
(PN
) = N_Pragma
then
727 case Get_Pragma_Id
(PN
) is
728 when Pragma_All_Calls_Remote |
729 Pragma_Preelaborate |
731 Pragma_Remote_Call_Interface |
732 Pragma_Remote_Types |
733 Pragma_Shared_Passive
=> Analyze
(PN
);
741 if Is_Child_Unit
(S
) and then Is_Generic_Instance
(S
) then
745 end Set_Categorization_From_Pragmas
;
747 -----------------------------------
748 -- Set_Categorization_From_Scope --
749 -----------------------------------
751 procedure Set_Categorization_From_Scope
(E
: Entity_Id
; Scop
: Entity_Id
) is
752 Declaration
: Node_Id
:= Empty
;
753 Specification
: Node_Id
:= Empty
;
757 (E
, Is_Pure
(Scop
) and then Is_Library_Level_Entity
(E
));
759 if not Is_Remote_Call_Interface
(E
) then
760 if Ekind
(E
) in Subprogram_Kind
then
761 Declaration
:= Unit_Declaration_Node
(E
);
763 if Nkind_In
(Declaration
, N_Subprogram_Body
,
764 N_Subprogram_Renaming_Declaration
)
766 Specification
:= Corresponding_Spec
(Declaration
);
770 -- A subprogram body or renaming-as-body is a remote call interface
771 -- if it serves as the completion of a subprogram declaration that
772 -- is a remote call interface.
774 if Nkind
(Specification
) in N_Entity
then
775 Set_Is_Remote_Call_Interface
776 (E
, Is_Remote_Call_Interface
(Specification
));
778 -- A subprogram declaration is a remote call interface when it is
779 -- declared within the visible part of, or declared by, a library
780 -- unit declaration that is a remote call interface.
783 Set_Is_Remote_Call_Interface
784 (E
, Is_Remote_Call_Interface
(Scop
)
785 and then not (In_Private_Part
(Scop
)
786 or else In_Package_Body
(Scop
)));
791 (E
, Is_Remote_Types
(Scop
)
792 and then not (In_Private_Part
(Scop
)
793 or else In_Package_Body
(Scop
)));
794 end Set_Categorization_From_Scope
;
796 ------------------------------
797 -- Static_Discriminant_Expr --
798 ------------------------------
800 -- We need to accommodate a Why_Not_Static call somehow here ???
802 function Static_Discriminant_Expr
(L
: List_Id
) return Boolean is
803 Discriminant_Spec
: Node_Id
;
806 Discriminant_Spec
:= First
(L
);
807 while Present
(Discriminant_Spec
) loop
808 if Present
(Expression
(Discriminant_Spec
))
810 not Is_OK_Static_Expression
(Expression
(Discriminant_Spec
))
815 Next
(Discriminant_Spec
);
819 end Static_Discriminant_Expr
;
821 --------------------------------------
822 -- Validate_Access_Type_Declaration --
823 --------------------------------------
825 procedure Validate_Access_Type_Declaration
(T
: Entity_Id
; N
: Node_Id
) is
826 Def
: constant Node_Id
:= Type_Definition
(N
);
831 -- Access to subprogram case
833 when N_Access_To_Subprogram_Definition
=>
835 -- A pure library_item must not contain the declaration of a
836 -- named access type, except within a subprogram, generic
837 -- subprogram, task unit, or protected unit (RM 10.2.1(16)).
839 -- This test is skipped in Ada 2005 (see AI-366)
841 if Ada_Version
< Ada_2005
842 and then Comes_From_Source
(T
)
843 and then In_Pure_Unit
844 and then not In_Subprogram_Task_Protected_Unit
846 Error_Msg_N
("named access type not allowed in pure unit", T
);
849 -- Access to object case
851 when N_Access_To_Object_Definition
=>
852 if Comes_From_Source
(T
)
853 and then In_Pure_Unit
854 and then not In_Subprogram_Task_Protected_Unit
856 -- We can't give the message yet, since the type is not frozen
857 -- and in Ada 2005 mode, access types are allowed in pure units
858 -- if the type has no storage pool (see AI-366). So we set a
859 -- flag which will be checked at freeze time.
861 Set_Is_Pure_Unit_Access_Type
(T
);
864 -- Check for RCI or RT unit type declaration: declaration of an
865 -- access-to-object type is illegal unless it is a general access
866 -- type that designates a class-wide limited private type.
867 -- Note that constraints on the primitive subprograms of the
868 -- designated tagged type are not enforced here but in
869 -- Validate_RACW_Primitives, which is done separately because the
870 -- designated type might not be frozen (and therefore its
871 -- primitive operations might not be completely known) at the
872 -- point of the RACW declaration.
874 Validate_Remote_Access_Object_Type_Declaration
(T
);
876 -- Check for shared passive unit type declaration. It should
877 -- not contain the declaration of access to class wide type,
878 -- access to task type and access to protected type with entry.
880 Validate_SP_Access_Object_Type_Decl
(T
);
886 -- Set categorization flag from package on entity as well, to allow
887 -- easy checks later on for required validations of RCI or RT units.
888 -- This is only done for entities that are in the original source.
890 if Comes_From_Source
(T
)
891 and then not (In_Package_Body
(Scope
(T
))
892 or else In_Private_Part
(Scope
(T
)))
894 Set_Is_Remote_Call_Interface
895 (T
, Is_Remote_Call_Interface
(Scope
(T
)));
897 (T
, Is_Remote_Types
(Scope
(T
)));
899 end Validate_Access_Type_Declaration
;
901 ----------------------------
902 -- Validate_Ancestor_Part --
903 ----------------------------
905 procedure Validate_Ancestor_Part
(N
: Node_Id
) is
906 A
: constant Node_Id
:= Ancestor_Part
(N
);
907 T
: constant Entity_Id
:= Entity
(A
);
910 if In_Preelaborated_Unit
911 and then not In_Subprogram_Or_Concurrent_Unit
912 and then (not Inside_A_Generic
913 or else Present
(Enclosing_Generic_Body
(N
)))
915 -- If the type is private, it must have the Ada 2005 pragma
916 -- Has_Preelaborable_Initialization.
918 -- The check is omitted within predefined units. This is probably
919 -- obsolete code to fix the Ada 95 weakness in this area ???
921 if Is_Private_Type
(T
)
922 and then not Has_Pragma_Preelab_Init
(T
)
923 and then not Is_Internal_File_Name
924 (Unit_File_Name
(Get_Source_Unit
(N
)))
927 ("private ancestor type not allowed in preelaborated unit", A
);
929 elsif Is_Record_Type
(T
) then
930 if Nkind
(Parent
(T
)) = N_Full_Type_Declaration
then
931 Check_Non_Static_Default_Expr
932 (Type_Definition
(Parent
(T
)), A
);
936 end Validate_Ancestor_Part
;
938 ----------------------------------------
939 -- Validate_Categorization_Dependency --
940 ----------------------------------------
942 procedure Validate_Categorization_Dependency
946 K
: constant Node_Kind
:= Nkind
(N
);
947 P
: Node_Id
:= Parent
(N
);
949 Is_Subunit
: constant Boolean := Nkind
(P
) = N_Subunit
;
952 -- Only validate library units and subunits. For subunits, checks
953 -- concerning withed units apply to the parent compilation unit.
960 and then not Is_Compilation_Unit
(U
)
961 and then not Is_Child_Unit
(U
)
967 if Nkind
(P
) /= N_Compilation_Unit
then
971 -- Body of RCI unit does not need validation
973 if Is_Remote_Call_Interface
(E
)
974 and then Nkind_In
(N
, N_Package_Body
, N_Subprogram_Body
)
979 -- Ada 2005 (AI-50217): Process explicit non-limited with_clauses
983 Entity_Of_Withed
: Entity_Id
;
986 Item
:= First
(Context_Items
(P
));
987 while Present
(Item
) loop
988 if Nkind
(Item
) = N_With_Clause
989 and then not (Implicit_With
(Item
)
990 or else Limited_Present
(Item
)
992 -- Skip if error already posted on the WITH
993 -- clause (in which case the Name attribute
994 -- may be invalid). In particular, this fixes
995 -- the problem of hanging in the presence of a
996 -- WITH clause on a child that is an illegal
997 -- generic instantiation.
999 or else Error_Posted
(Item
))
1001 Entity_Of_Withed
:= Entity
(Name
(Item
));
1002 Check_Categorization_Dependencies
1003 (U
, Entity_Of_Withed
, Item
, Is_Subunit
);
1010 -- Child depends on parent; therefore parent should also be categorized
1011 -- and satisfy the dependency hierarchy.
1013 -- Check if N is a child spec
1015 if (K
in N_Generic_Declaration
or else
1016 K
in N_Generic_Instantiation
or else
1017 K
in N_Generic_Renaming_Declaration
or else
1018 K
= N_Package_Declaration
or else
1019 K
= N_Package_Renaming_Declaration
or else
1020 K
= N_Subprogram_Declaration
or else
1021 K
= N_Subprogram_Renaming_Declaration
)
1022 and then Present
(Parent_Spec
(N
))
1024 Check_Categorization_Dependencies
(E
, Scope
(E
), N
, False);
1026 -- Verify that public child of an RCI library unit must also be an
1027 -- RCI library unit (RM E.2.3(15)).
1029 if Is_Remote_Call_Interface
(Scope
(E
))
1030 and then not Private_Present
(P
)
1031 and then not Is_Remote_Call_Interface
(E
)
1033 Error_Msg_N
("public child of rci unit must also be rci unit", N
);
1036 end Validate_Categorization_Dependency
;
1038 --------------------------------
1039 -- Validate_Controlled_Object --
1040 --------------------------------
1042 procedure Validate_Controlled_Object
(E
: Entity_Id
) is
1044 -- Don't need this check in Ada 2005 mode, where this is all taken
1045 -- care of by the mechanism for Preelaborable Initialization.
1047 if Ada_Version
>= Ada_2005
then
1051 -- For now, never apply this check for internal GNAT units, since we
1052 -- have a number of cases in the library where we are stuck with objects
1053 -- of this type, and the RM requires Preelaborate.
1055 -- For similar reasons, we only do this check for source entities, since
1056 -- we generate entities of this type in some situations.
1058 -- Note that the 10.2.1(9) restrictions are not relevant to us anyway.
1059 -- We have to enforce them for RM compatibility, but we have no trouble
1060 -- accepting these objects and doing the right thing. Note that there is
1061 -- no requirement that Preelaborate not actually generate any code.
1063 if In_Preelaborated_Unit
1064 and then not Debug_Flag_PP
1065 and then Comes_From_Source
(E
)
1067 Is_Internal_File_Name
(Unit_File_Name
(Get_Source_Unit
(E
)))
1068 and then (not Inside_A_Generic
1069 or else Present
(Enclosing_Generic_Body
(E
)))
1070 and then not Is_Protected_Type
(Etype
(E
))
1073 ("library level controlled object not allowed in " &
1074 "preelaborated unit", E
);
1076 end Validate_Controlled_Object
;
1078 --------------------------------------
1079 -- Validate_Null_Statement_Sequence --
1080 --------------------------------------
1082 procedure Validate_Null_Statement_Sequence
(N
: Node_Id
) is
1086 if In_Preelaborated_Unit
then
1087 Item
:= First
(Statements
(Handled_Statement_Sequence
(N
)));
1088 while Present
(Item
) loop
1089 if Nkind
(Item
) /= N_Label
1090 and then Nkind
(Item
) /= N_Null_Statement
1092 -- In GNAT mode, this is a warning, allowing the run-time
1093 -- to judiciously bypass this error condition.
1095 Error_Msg_Warn
:= GNAT_Mode
;
1097 ("<<statements not allowed in preelaborated unit", Item
);
1105 end Validate_Null_Statement_Sequence
;
1107 ---------------------------------
1108 -- Validate_Object_Declaration --
1109 ---------------------------------
1111 procedure Validate_Object_Declaration
(N
: Node_Id
) is
1112 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1113 E
: constant Node_Id
:= Expression
(N
);
1114 Odf
: constant Node_Id
:= Object_Definition
(N
);
1115 T
: constant Entity_Id
:= Etype
(Id
);
1118 -- Verify that any access to subprogram object does not have in its
1119 -- subprogram profile access type parameters or limited parameters
1120 -- without Read and Write attributes (E.2.3(13)).
1122 Validate_RCI_Subprogram_Declaration
(N
);
1124 -- Check that if we are in preelaborated elaboration code, then we
1125 -- do not have an instance of a default initialized private, task or
1126 -- protected object declaration which would violate (RM 10.2.1(9)).
1127 -- Note that constants are never default initialized (and the test
1128 -- below also filters out deferred constants). A variable is default
1129 -- initialized if it does *not* have an initialization expression.
1131 -- Filter out cases that are not declaration of a variable from source
1133 if Nkind
(N
) /= N_Object_Declaration
1134 or else Constant_Present
(N
)
1135 or else not Comes_From_Source
(Id
)
1140 -- Exclude generic specs from the checks (this will get rechecked
1141 -- on instantiations).
1143 if Inside_A_Generic
and then No
(Enclosing_Generic_Body
(Id
)) then
1147 -- Required checks for declaration that is in a preelaborated package
1148 -- and is not within some subprogram.
1150 if In_Preelaborated_Unit
1151 and then not In_Subprogram_Or_Concurrent_Unit
1153 -- Check for default initialized variable case. Note that in
1154 -- accordance with (RM B.1(24)) imported objects are not subject to
1155 -- default initialization.
1156 -- If the initialization does not come from source and is an
1157 -- aggregate, it is a static initialization that replaces an
1158 -- implicit call, and must be treated as such.
1161 and then (Comes_From_Source
(E
) or else Nkind
(E
) /= N_Aggregate
)
1165 elsif Is_Imported
(Id
) then
1170 Ent
: Entity_Id
:= T
;
1173 -- An array whose component type is a record with nonstatic
1174 -- default expressions is a violation, so we get the array's
1177 if Is_Array_Type
(Ent
) then
1179 Comp_Type
: Entity_Id
;
1182 Comp_Type
:= Component_Type
(Ent
);
1183 while Is_Array_Type
(Comp_Type
) loop
1184 Comp_Type
:= Component_Type
(Comp_Type
);
1191 -- Object decl. that is of record type and has no default expr.
1192 -- should check if there is any non-static default expression
1193 -- in component decl. of the record type decl.
1195 if Is_Record_Type
(Ent
) then
1196 if Nkind
(Parent
(Ent
)) = N_Full_Type_Declaration
then
1197 Check_Non_Static_Default_Expr
1198 (Type_Definition
(Parent
(Ent
)), N
);
1200 elsif Nkind
(Odf
) = N_Subtype_Indication
1201 and then not Is_Array_Type
(T
)
1202 and then not Is_Private_Type
(T
)
1204 Check_Non_Static_Default_Expr
(Type_Definition
1205 (Parent
(Entity
(Subtype_Mark
(Odf
)))), N
);
1209 -- Check for invalid use of private object. Note that Ada 2005
1210 -- AI-161 modifies the rules for Ada 2005, including the use of
1211 -- the new pragma Preelaborable_Initialization.
1213 if Is_Private_Type
(Ent
)
1214 or else Depends_On_Private
(Ent
)
1216 -- Case where type has preelaborable initialization which
1217 -- means that a pragma Preelaborable_Initialization was
1218 -- given for the private type.
1220 if Relaxed_RM_Semantics
then
1222 -- In relaxed mode, do not issue these messages, this
1223 -- is basically similar to the GNAT_Mode test below.
1227 elsif Has_Preelaborable_Initialization
(Ent
) then
1229 -- But for the predefined units, we will ignore this
1230 -- status unless we are in Ada 2005 mode since we want
1231 -- Ada 95 compatible behavior, in which the entities
1232 -- marked with this pragma in the predefined library are
1233 -- not treated specially.
1235 if Ada_Version
< Ada_2005
then
1237 ("private object not allowed in preelaborated unit",
1239 Error_Msg_N
("\(would be legal in Ada 2005 mode)", N
);
1242 -- Type does not have preelaborable initialization
1245 -- We allow this when compiling in GNAT mode to make life
1246 -- easier for some cases where it would otherwise be hard
1247 -- to be exactly valid Ada.
1249 if not GNAT_Mode
then
1251 ("private object not allowed in preelaborated unit",
1254 -- Add a message if it would help to provide a pragma
1255 -- Preelaborable_Initialization on the type of the
1256 -- object (which would make it legal in Ada 2005).
1258 -- If the type has no full view (generic type, or
1259 -- previous error), the warning does not apply.
1261 if Is_Private_Type
(Ent
)
1262 and then Present
(Full_View
(Ent
))
1264 Has_Preelaborable_Initialization
(Full_View
(Ent
))
1266 Error_Msg_Sloc
:= Sloc
(Ent
);
1268 if Ada_Version
>= Ada_2005
then
1270 ("\would be legal if pragma Preelaborable_" &
1271 "Initialization given for & #", N
, Ent
);
1274 ("\would be legal in Ada 2005 if pragma " &
1275 "Preelaborable_Initialization given for & #",
1282 -- Access to Task or Protected type
1284 elsif Is_Entity_Name
(Odf
)
1285 and then Present
(Etype
(Odf
))
1286 and then Is_Access_Type
(Etype
(Odf
))
1288 Ent
:= Designated_Type
(Etype
(Odf
));
1290 elsif Is_Entity_Name
(Odf
) then
1291 Ent
:= Entity
(Odf
);
1293 elsif Nkind
(Odf
) = N_Subtype_Indication
then
1294 Ent
:= Etype
(Subtype_Mark
(Odf
));
1296 elsif Nkind
(Odf
) = N_Constrained_Array_Definition
then
1297 Ent
:= Component_Type
(T
);
1300 if Is_Task_Type
(Ent
)
1301 or else (Is_Protected_Type
(Ent
) and then Has_Entries
(Ent
))
1304 ("concurrent object not allowed in preelaborated unit",
1311 -- Non-static discriminants not allowed in preelaborated unit.
1312 -- Objects of a controlled type with a user-defined Initialize
1313 -- are forbidden as well.
1315 if Is_Record_Type
(Etype
(Id
)) then
1317 ET
: constant Entity_Id
:= Etype
(Id
);
1318 EE
: constant Entity_Id
:= Etype
(Etype
(Id
));
1322 if Has_Discriminants
(ET
) and then Present
(EE
) then
1325 if Nkind
(PEE
) = N_Full_Type_Declaration
1326 and then not Static_Discriminant_Expr
1327 (Discriminant_Specifications
(PEE
))
1330 ("non-static discriminant in preelaborated unit",
1335 -- For controlled type or type with controlled component, check
1336 -- preelaboration flag, as there may be a non-null Initialize
1337 -- primitive. For language versions earlier than Ada 2005,
1338 -- there is no notion of preelaborable initialization, and
1339 -- Validate_Controlled_Object is used to enforce rules for
1340 -- controlled objects.
1342 if (Is_Controlled
(ET
) or else Has_Controlled_Component
(ET
))
1343 and then Ada_Version
>= Ada_2005
1344 and then not Has_Preelaborable_Initialization
(ET
)
1347 ("controlled type& does not have"
1348 & " preelaborable initialization", N
, ET
);
1355 -- A pure library_item must not contain the declaration of any variable
1356 -- except within a subprogram, generic subprogram, task unit, or
1357 -- protected unit (RM 10.2.1(16)).
1359 if In_Pure_Unit
and then not In_Subprogram_Task_Protected_Unit
then
1360 Error_Msg_N
("declaration of variable not allowed in pure unit", N
);
1362 elsif not In_Private_Part
(Id
) then
1364 -- The visible part of an RCI library unit must not contain the
1365 -- declaration of a variable (RM E.1.3(9)).
1367 if In_RCI_Declaration
then
1368 Error_Msg_N
("visible variable not allowed in 'R'C'I unit", N
);
1370 -- The visible part of a Shared Passive library unit must not contain
1371 -- the declaration of a variable (RM E.2.2(7)).
1373 elsif In_RT_Declaration
then
1375 ("visible variable not allowed in remote types unit", N
);
1378 end Validate_Object_Declaration
;
1380 -----------------------------
1381 -- Validate_RACW_Primitive --
1382 -----------------------------
1384 procedure Validate_RACW_Primitive
1388 procedure Illegal_Remote_Subp
(Msg
: String; N
: Node_Id
);
1389 -- Diagnose illegality on N. If RACW is present, report the error on it
1390 -- rather than on N.
1392 -------------------------
1393 -- Illegal_Remote_Subp --
1394 -------------------------
1396 procedure Illegal_Remote_Subp
(Msg
: String; N
: Node_Id
) is
1398 if Present
(RACW
) then
1399 if not Error_Posted
(RACW
) then
1401 ("illegal remote access to class-wide type&", RACW
);
1404 Error_Msg_Sloc
:= Sloc
(N
);
1405 Error_Msg_NE
("\\" & Msg
& " in primitive& #", RACW
, Subp
);
1408 Error_Msg_NE
(Msg
& " in remote subprogram&", N
, Subp
);
1410 end Illegal_Remote_Subp
;
1414 Param_Spec
: Node_Id
;
1415 Param_Type
: Entity_Id
;
1417 -- Start of processing for Validate_RACW_Primitive
1420 -- Check return type
1422 if Ekind
(Subp
) = E_Function
then
1423 Rtyp
:= Etype
(Subp
);
1425 -- AI05-0101 (Binding Interpretation): The result type of a remote
1426 -- function must either support external streaming or be a
1427 -- controlling access result type.
1429 if Has_Controlling_Result
(Subp
) then
1432 elsif Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
1433 Illegal_Remote_Subp
("anonymous access result", Rtyp
);
1435 elsif Is_Limited_Type
(Rtyp
) then
1436 if No
(TSS
(Rtyp
, TSS_Stream_Read
))
1438 No
(TSS
(Rtyp
, TSS_Stream_Write
))
1441 ("limited return type must have Read and Write attributes",
1443 Explain_Limited_Type
(Rtyp
, Parent
(Subp
));
1446 -- Check that the return type supports external streaming
1448 elsif No_External_Streaming
(Rtyp
)
1449 and then not Error_Posted
(Rtyp
)
1451 Illegal_Remote_Subp
("return type containing non-remote access "
1452 & "must have Read and Write attributes",
1457 Param
:= First_Formal
(Subp
);
1458 while Present
(Param
) loop
1460 -- Now find out if this parameter is a controlling parameter
1462 Param_Spec
:= Parent
(Param
);
1463 Param_Type
:= Etype
(Param
);
1465 if Is_Controlling_Formal
(Param
) then
1467 -- It is a controlling parameter, so specific checks below do not
1472 elsif Ekind_In
(Param_Type
, E_Anonymous_Access_Type
,
1473 E_Anonymous_Access_Subprogram_Type
)
1475 -- From RM E.2.2(14), no anonymous access parameter other than
1476 -- controlling ones may be used (because an anonymous access
1477 -- type never supports external streaming).
1480 ("non-controlling access parameter", Param_Spec
);
1482 elsif No_External_Streaming
(Param_Type
)
1483 and then not Error_Posted
(Param_Type
)
1485 Illegal_Remote_Subp
("formal parameter in remote subprogram must "
1486 & "support external streaming", Param_Spec
);
1489 -- Check next parameter in this subprogram
1491 Next_Formal
(Param
);
1493 end Validate_RACW_Primitive
;
1495 ------------------------------
1496 -- Validate_RACW_Primitives --
1497 ------------------------------
1499 procedure Validate_RACW_Primitives
(T
: Entity_Id
) is
1500 Desig_Type
: Entity_Id
;
1501 Primitive_Subprograms
: Elist_Id
;
1502 Subprogram_Elmt
: Elmt_Id
;
1503 Subprogram
: Entity_Id
;
1506 Desig_Type
:= Etype
(Designated_Type
(T
));
1508 -- No action needed for concurrent types
1510 if Is_Concurrent_Type
(Desig_Type
) then
1514 Primitive_Subprograms
:= Primitive_Operations
(Desig_Type
);
1516 Subprogram_Elmt
:= First_Elmt
(Primitive_Subprograms
);
1517 while Subprogram_Elmt
/= No_Elmt
loop
1518 Subprogram
:= Node
(Subprogram_Elmt
);
1520 if Is_Predefined_Dispatching_Operation
(Subprogram
)
1521 or else Is_Hidden
(Subprogram
)
1523 goto Next_Subprogram
;
1526 Validate_RACW_Primitive
(Subp
=> Subprogram
, RACW
=> T
);
1529 Next_Elmt
(Subprogram_Elmt
);
1531 end Validate_RACW_Primitives
;
1533 -------------------------------
1534 -- Validate_RCI_Declarations --
1535 -------------------------------
1537 procedure Validate_RCI_Declarations
(P
: Entity_Id
) is
1541 E
:= First_Entity
(P
);
1542 while Present
(E
) loop
1543 if Comes_From_Source
(E
) then
1544 if Is_Limited_Type
(E
) then
1546 ("limited type not allowed in rci unit", Parent
(E
));
1547 Explain_Limited_Type
(E
, Parent
(E
));
1549 elsif Ekind_In
(E
, E_Generic_Function
,
1551 E_Generic_Procedure
)
1553 Error_Msg_N
("generic declaration not allowed in rci unit",
1556 elsif (Ekind
(E
) = E_Function
or else Ekind
(E
) = E_Procedure
)
1557 and then Has_Pragma_Inline
(E
)
1560 ("inlined subprogram not allowed in rci unit", Parent
(E
));
1562 -- Inner packages that are renamings need not be checked. Generic
1563 -- RCI packages are subject to the checks, but entities that come
1564 -- from formal packages are not part of the visible declarations
1565 -- of the package and are not checked.
1567 elsif Ekind
(E
) = E_Package
then
1568 if Present
(Renamed_Entity
(E
)) then
1571 elsif Ekind
(P
) /= E_Generic_Package
1572 or else List_Containing
(Unit_Declaration_Node
(E
)) /=
1573 Generic_Formal_Declarations
1574 (Unit_Declaration_Node
(P
))
1576 Validate_RCI_Declarations
(E
);
1583 end Validate_RCI_Declarations
;
1585 -----------------------------------------
1586 -- Validate_RCI_Subprogram_Declaration --
1587 -----------------------------------------
1589 procedure Validate_RCI_Subprogram_Declaration
(N
: Node_Id
) is
1590 K
: constant Node_Kind
:= Nkind
(N
);
1592 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1593 Param_Spec
: Node_Id
;
1594 Param_Type
: Entity_Id
;
1595 Error_Node
: Node_Id
:= N
;
1598 -- This procedure enforces rules on subprogram and access to subprogram
1599 -- declarations in RCI units. These rules do not apply to expander
1600 -- generated routines, which are not remote subprograms. It is called:
1602 -- 1. from Analyze_Subprogram_Declaration.
1603 -- 2. from Validate_Object_Declaration (access to subprogram).
1605 if not (Comes_From_Source
(N
)
1606 and then In_RCI_Declaration
1607 and then not In_Private_Part
(Scope
(Id
)))
1612 if K
= N_Subprogram_Declaration
then
1613 Profile
:= Parameter_Specifications
(Specification
(N
));
1616 pragma Assert
(K
= N_Object_Declaration
);
1618 -- The above assertion is dubious, the visible declarations of an
1619 -- RCI unit never contain an object declaration, this should be an
1620 -- ACCESS-to-object declaration???
1622 if Nkind
(Id
) = N_Defining_Identifier
1623 and then Nkind
(Parent
(Etype
(Id
))) = N_Full_Type_Declaration
1624 and then Ekind
(Etype
(Id
)) = E_Access_Subprogram_Type
1627 Parameter_Specifications
(Type_Definition
(Parent
(Etype
(Id
))));
1633 -- Iterate through the parameter specification list, checking that
1634 -- no access parameter and no limited type parameter in the list.
1637 if Present
(Profile
) then
1638 Param_Spec
:= First
(Profile
);
1639 while Present
(Param_Spec
) loop
1640 Param_Type
:= Etype
(Defining_Identifier
(Param_Spec
));
1642 if Ekind
(Param_Type
) = E_Anonymous_Access_Type
then
1643 if K
= N_Subprogram_Declaration
then
1644 Error_Node
:= Param_Spec
;
1647 -- Report error only if declaration is in source program
1649 if Comes_From_Source
(Id
) then
1651 ("subprogram in 'R'C'I unit cannot have access parameter",
1655 -- For a limited private type parameter, we check only the private
1656 -- declaration and ignore full type declaration, unless this is
1657 -- the only declaration for the type, e.g., as a limited record.
1659 elsif No_External_Streaming
(Param_Type
) then
1660 if K
= N_Subprogram_Declaration
then
1661 Error_Node
:= Param_Spec
;
1665 ("formal of remote subprogram& "
1666 & "must support external streaming",
1668 if Is_Limited_Type
(Param_Type
) then
1669 Explain_Limited_Type
(Param_Type
, Error_Node
);
1677 if Ekind
(Id
) = E_Function
1678 and then Ekind
(Etype
(Id
)) = E_Anonymous_Access_Type
1679 and then Comes_From_Source
(Id
)
1682 ("function in 'R'C'I unit cannot have access result",
1685 end Validate_RCI_Subprogram_Declaration
;
1687 ----------------------------------------------------
1688 -- Validate_Remote_Access_Object_Type_Declaration --
1689 ----------------------------------------------------
1691 procedure Validate_Remote_Access_Object_Type_Declaration
(T
: Entity_Id
) is
1692 Direct_Designated_Type
: Entity_Id
;
1693 Desig_Type
: Entity_Id
;
1696 -- We are called from Analyze_Full_Type_Declaration, and the Nkind of
1697 -- the given node is N_Access_To_Object_Definition.
1699 if not Comes_From_Source
(T
)
1700 or else (not In_RCI_Declaration
and then not In_RT_Declaration
)
1705 -- An access definition in the private part of a package is not a
1706 -- remote access type. Restrictions related to external streaming
1707 -- support for non-remote access types are enforced elsewhere. Note
1708 -- that In_Private_Part is never set on type entities: check flag
1709 -- on enclosing scope.
1711 if In_Private_Part
(Scope
(T
)) then
1715 -- Check RCI or RT unit type declaration. It may not contain the
1716 -- declaration of an access-to-object type unless it is a general access
1717 -- type that designates a class-wide limited private type or subtype.
1718 -- There are also constraints on the primitive subprograms of the
1719 -- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives).
1721 if Ekind
(T
) /= E_General_Access_Type
1722 or else not Is_Class_Wide_Type
(Designated_Type
(T
))
1724 if In_RCI_Declaration
then
1726 ("error in access type in Remote_Call_Interface unit", T
);
1729 ("error in access type in Remote_Types unit", T
);
1732 Error_Msg_N
("\must be general access to class-wide type", T
);
1736 Direct_Designated_Type
:= Designated_Type
(T
);
1737 Desig_Type
:= Etype
(Direct_Designated_Type
);
1739 -- Why is this check not in Validate_Remote_Access_To_Class_Wide_Type???
1741 if not Is_Valid_Remote_Object_Type
(Desig_Type
) then
1743 ("error in designated type of remote access to class-wide type", T
);
1745 ("\must be tagged limited private or private extension", T
);
1748 end Validate_Remote_Access_Object_Type_Declaration
;
1750 -----------------------------------------------
1751 -- Validate_Remote_Access_To_Class_Wide_Type --
1752 -----------------------------------------------
1754 procedure Validate_Remote_Access_To_Class_Wide_Type
(N
: Node_Id
) is
1755 K
: constant Node_Kind
:= Nkind
(N
);
1756 PK
: constant Node_Kind
:= Nkind
(Parent
(N
));
1760 -- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses
1761 -- of class-wide limited private types.
1763 -- Storage_Pool and Storage_Size are not defined for such types
1765 -- The expected type of allocator must not be such a type.
1767 -- The actual parameter of generic instantiation must not be such a
1768 -- type if the formal parameter is of an access type.
1770 -- On entry, there are several cases:
1772 -- 1. called from sem_attr Analyze_Attribute where attribute name is
1773 -- either Storage_Pool or Storage_Size.
1775 -- 2. called from exp_ch4 Expand_N_Allocator
1777 -- 3. called from sem_ch4 Analyze_Explicit_Dereference
1779 -- 4. called from sem_res Resolve_Actuals
1781 if K
= N_Attribute_Reference
then
1782 E
:= Etype
(Prefix
(N
));
1784 if Is_Remote_Access_To_Class_Wide_Type
(E
) then
1785 Error_Msg_N
("incorrect attribute of remote operand", N
);
1789 elsif K
= N_Allocator
then
1792 if Is_Remote_Access_To_Class_Wide_Type
(E
) then
1793 Error_Msg_N
("incorrect expected remote type of allocator", N
);
1797 -- This subprogram also enforces the checks in E.2.2(13). A value of
1798 -- such type must not be dereferenced unless as controlling operand of
1799 -- a dispatching call. Explicit dereferences not coming from source are
1800 -- exempted from this checking because the expander produces them in
1801 -- some cases (such as for tag checks on dispatching calls with multiple
1802 -- controlling operands). However we do check in the case of an implicit
1803 -- dereference that is expanded to an explicit dereference (hence the
1804 -- test of whether Original_Node (N) comes from source).
1806 elsif K
= N_Explicit_Dereference
1807 and then Comes_From_Source
(Original_Node
(N
))
1809 E
:= Etype
(Prefix
(N
));
1811 -- If the class-wide type is not a remote one, the restrictions
1814 if not Is_Remote_Access_To_Class_Wide_Type
(E
) then
1818 -- If we have a true dereference that comes from source and that
1819 -- is a controlling argument for a dispatching call, accept it.
1821 if Is_Actual_Parameter
(N
) and then Is_Controlling_Actual
(N
) then
1825 -- If we are just within a procedure or function call and the
1826 -- dereference has not been analyzed, return because this procedure
1827 -- will be called again from sem_res Resolve_Actuals. The same can
1828 -- apply in the case of dereference that is the prefix of a selected
1829 -- component, which can be a call given in prefixed form.
1831 if (Is_Actual_Parameter
(N
) or else PK
= N_Selected_Component
)
1832 and then not Analyzed
(N
)
1837 -- We must allow expanded code to generate a reference to the tag of
1838 -- the designated object (may be either the actual tag, or the stub
1839 -- tag in the case of a remote object).
1841 if PK
= N_Selected_Component
1842 and then Is_Tag
(Entity
(Selector_Name
(Parent
(N
))))
1848 ("invalid dereference of a remote access-to-class-wide value", N
);
1850 end Validate_Remote_Access_To_Class_Wide_Type
;
1852 ------------------------------------------
1853 -- Validate_Remote_Type_Type_Conversion --
1854 ------------------------------------------
1856 procedure Validate_Remote_Type_Type_Conversion
(N
: Node_Id
) is
1857 S
: constant Entity_Id
:= Etype
(N
);
1858 E
: constant Entity_Id
:= Etype
(Expression
(N
));
1861 -- This test is required in the case where a conversion appears inside a
1862 -- normal package, it does not necessarily have to be inside an RCI,
1863 -- Remote_Types unit (RM E.2.2(9,12)).
1865 if Is_Remote_Access_To_Subprogram_Type
(E
)
1866 and then not Is_Remote_Access_To_Subprogram_Type
(S
)
1869 ("incorrect conversion of remote operand to local type", N
);
1872 elsif not Is_Remote_Access_To_Subprogram_Type
(E
)
1873 and then Is_Remote_Access_To_Subprogram_Type
(S
)
1876 ("incorrect conversion of local operand to remote type", N
);
1879 elsif Is_Remote_Access_To_Class_Wide_Type
(E
)
1880 and then not Is_Remote_Access_To_Class_Wide_Type
(S
)
1883 ("incorrect conversion of remote operand to local type", N
);
1887 -- If a local access type is converted into a RACW type, then the
1888 -- current unit has a pointer that may now be exported to another
1891 if Is_Remote_Access_To_Class_Wide_Type
(S
)
1892 and then not Is_Remote_Access_To_Class_Wide_Type
(E
)
1894 Set_Has_RACW
(Current_Sem_Unit
);
1896 end Validate_Remote_Type_Type_Conversion
;
1898 -------------------------------
1899 -- Validate_RT_RAT_Component --
1900 -------------------------------
1902 procedure Validate_RT_RAT_Component
(N
: Node_Id
) is
1903 Spec
: constant Node_Id
:= Specification
(N
);
1904 Name_U
: constant Entity_Id
:= Defining_Entity
(Spec
);
1907 First_Priv_Ent
: constant Entity_Id
:= First_Private_Entity
(Name_U
);
1909 function Stream_Attributes_Available
(Typ
: Entity_Id
) return Boolean;
1910 -- True if any stream attribute is available for Typ
1912 ---------------------------------
1913 -- Stream_Attributes_Available --
1914 ---------------------------------
1916 function Stream_Attributes_Available
(Typ
: Entity_Id
) return Boolean
1919 return Stream_Attribute_Available
(Typ
, TSS_Stream_Read
)
1921 Stream_Attribute_Available
(Typ
, TSS_Stream_Write
)
1923 Stream_Attribute_Available
(Typ
, TSS_Stream_Input
)
1925 Stream_Attribute_Available
(Typ
, TSS_Stream_Output
);
1926 end Stream_Attributes_Available
;
1928 -- Start of processing for Validate_RT_RAT_Component
1931 if not Is_Remote_Types
(Name_U
) then
1935 Typ
:= First_Entity
(Name_U
);
1936 while Present
(Typ
) and then Typ
/= First_Priv_Ent
loop
1937 U_Typ
:= Underlying_Type
(Base_Type
(Typ
));
1943 if Comes_From_Source
(Typ
) and then Is_Type
(Typ
) then
1945 -- Check that the type can be meaningfully transmitted to another
1946 -- partition (E.2.2(8)).
1948 if (Ada_Version
< Ada_2005
and then Has_Non_Remote_Access
(U_Typ
))
1949 or else (Stream_Attributes_Available
(Typ
)
1950 and then No_External_Streaming
(U_Typ
))
1952 if Is_Non_Remote_Access_Type
(Typ
) then
1953 Error_Msg_N
("error in non-remote access type", U_Typ
);
1956 ("error in record type containing a component of a " &
1957 "non-remote access type", U_Typ
);
1960 if Ada_Version
>= Ada_2005
then
1962 ("\must have visible Read and Write attribute " &
1963 "definition clauses (RM E.2.2(8))", U_Typ
);
1966 ("\must have Read and Write attribute " &
1967 "definition clauses (RM E.2.2(8))", U_Typ
);
1974 end Validate_RT_RAT_Component
;
1976 -----------------------------------------
1977 -- Validate_SP_Access_Object_Type_Decl --
1978 -----------------------------------------
1980 procedure Validate_SP_Access_Object_Type_Decl
(T
: Entity_Id
) is
1981 Direct_Designated_Type
: Entity_Id
;
1983 function Has_Entry_Declarations
(E
: Entity_Id
) return Boolean;
1984 -- Return true if the protected type designated by T has entry
1987 ----------------------------
1988 -- Has_Entry_Declarations --
1989 ----------------------------
1991 function Has_Entry_Declarations
(E
: Entity_Id
) return Boolean is
1995 if Nkind
(Parent
(E
)) = N_Protected_Type_Declaration
then
1996 Ety
:= First_Entity
(E
);
1997 while Present
(Ety
) loop
1998 if Ekind
(Ety
) = E_Entry
then
2007 end Has_Entry_Declarations
;
2009 -- Start of processing for Validate_SP_Access_Object_Type_Decl
2012 -- We are called from Sem_Ch3.Analyze_Full_Type_Declaration, and the
2013 -- Nkind of the given entity is N_Access_To_Object_Definition.
2015 if not Comes_From_Source
(T
)
2016 or else not In_Shared_Passive_Unit
2017 or else In_Subprogram_Task_Protected_Unit
2022 -- Check Shared Passive unit. It should not contain the declaration
2023 -- of an access-to-object type whose designated type is a class-wide
2024 -- type, task type or protected type with entry (RM E.2.1(7)).
2026 Direct_Designated_Type
:= Designated_Type
(T
);
2028 if Ekind
(Direct_Designated_Type
) = E_Class_Wide_Type
then
2030 ("invalid access-to-class-wide type in shared passive unit", T
);
2033 elsif Ekind
(Direct_Designated_Type
) in Task_Kind
then
2035 ("invalid access-to-task type in shared passive unit", T
);
2038 elsif Ekind
(Direct_Designated_Type
) in Protected_Kind
2039 and then Has_Entry_Declarations
(Direct_Designated_Type
)
2042 ("invalid access-to-protected type in shared passive unit", T
);
2045 end Validate_SP_Access_Object_Type_Decl
;
2047 ---------------------------------
2048 -- Validate_Static_Object_Name --
2049 ---------------------------------
2051 procedure Validate_Static_Object_Name
(N
: Node_Id
) is
2055 function Is_Primary
(N
: Node_Id
) return Boolean;
2056 -- Determine whether node is syntactically a primary in an expression
2057 -- This function should probably be somewhere else ???
2059 -- Also it does not do what it says, e.g if N is a binary operator
2060 -- whose parent is a binary operator, Is_Primary returns True ???
2066 function Is_Primary
(N
: Node_Id
) return Boolean is
2067 K
: constant Node_Kind
:= Nkind
(Parent
(N
));
2071 when N_Op | N_Membership_Test
=>
2075 | N_Component_Association
2076 | N_Index_Or_Discriminant_Constraint
=>
2079 when N_Attribute_Reference
=>
2080 return Attribute_Name
(Parent
(N
)) /= Name_Address
2081 and then Attribute_Name
(Parent
(N
)) /= Name_Access
2082 and then Attribute_Name
(Parent
(N
)) /= Name_Unchecked_Access
2084 Attribute_Name
(Parent
(N
)) /= Name_Unrestricted_Access
;
2086 when N_Indexed_Component
=>
2087 return (N
/= Prefix
(Parent
(N
))
2088 or else Is_Primary
(Parent
(N
)));
2090 when N_Qualified_Expression | N_Type_Conversion
=>
2091 return Is_Primary
(Parent
(N
));
2093 when N_Assignment_Statement | N_Object_Declaration
=>
2094 return (N
= Expression
(Parent
(N
)));
2096 when N_Selected_Component
=>
2097 return Is_Primary
(Parent
(N
));
2104 -- Start of processing for Validate_Static_Object_Name
2107 if not In_Preelaborated_Unit
2108 or else not Comes_From_Source
(N
)
2109 or else In_Subprogram_Or_Concurrent_Unit
2110 or else Ekind
(Current_Scope
) = E_Block
2114 -- Filter out cases where primary is default in a component declaration,
2115 -- discriminant specification, or actual in a record type initialization
2118 -- Initialization call of internal types
2120 elsif Nkind
(Parent
(N
)) = N_Procedure_Call_Statement
then
2122 if Present
(Parent
(Parent
(N
)))
2123 and then Nkind
(Parent
(Parent
(N
))) = N_Freeze_Entity
2128 if Nkind
(Name
(Parent
(N
))) = N_Identifier
2129 and then not Comes_From_Source
(Entity
(Name
(Parent
(N
))))
2135 -- Error if the name is a primary in an expression. The parent must not
2136 -- be an operator, or a selected component or an indexed component that
2137 -- is itself a primary. Entities that are actuals do not need to be
2138 -- checked, because the call itself will be diagnosed.
2141 and then (not Inside_A_Generic
2142 or else Present
(Enclosing_Generic_Body
(N
)))
2144 if Ekind
(Entity
(N
)) = E_Variable
2145 or else Ekind
(Entity
(N
)) in Formal_Object_Kind
2147 Flag_Non_Static_Expr
2148 ("non-static object name in preelaborated unit", N
);
2150 -- Give an error for a reference to a nonstatic constant, unless the
2151 -- constant is in another GNAT library unit that is preelaborable.
2153 elsif Ekind
(Entity
(N
)) = E_Constant
2154 and then not Is_Static_Expression
(N
)
2157 Val
:= Constant_Value
(E
);
2159 if Is_Internal_File_Name
(Unit_File_Name
(Get_Source_Unit
(N
)))
2161 Enclosing_Comp_Unit_Node
(N
) /= Enclosing_Comp_Unit_Node
(E
)
2162 and then (Is_Preelaborated
(Scope
(E
))
2163 or else Is_Pure
(Scope
(E
))
2164 or else (Present
(Renamed_Object
(E
))
2165 and then Is_Entity_Name
(Renamed_Object
(E
))
2168 (Scope
(Renamed_Object
(E
)))
2171 (Scope
(Renamed_Object
(E
))))))
2175 -- If the value of the constant is a local variable that renames
2176 -- an aggregate, this is in itself legal. The aggregate may be
2177 -- expanded into a loop, but this does not affect preelaborability
2178 -- in itself. If some aggregate components are non-static, that is
2179 -- to say if they involve non static primaries, they will be
2180 -- flagged when analyzed.
2183 and then Is_Entity_Name
(Val
)
2184 and then Is_Array_Type
(Etype
(Val
))
2185 and then not Comes_From_Source
(Val
)
2186 and then Nkind
(Original_Node
(Val
)) = N_Aggregate
2190 -- This is the error case
2193 -- In GNAT mode or Relaxed RM Semantic mode, this is just a
2194 -- warning, to allow it to be judiciously turned off.
2195 -- Otherwise it is a real error.
2197 if GNAT_Mode
or Relaxed_RM_Semantics
then
2199 ("??non-static constant in preelaborated unit", N
);
2201 Flag_Non_Static_Expr
2202 ("non-static constant in preelaborated unit", N
);
2207 end Validate_Static_Object_Name
;