1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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
446 -- The stream operation may be specified by an attribute definition
447 -- clause in the source, or by an aspect that generates such an
448 -- attribute definition. For an aspect, the generated attribute
449 -- definition may be placed at the freeze point of the full view of
450 -- the type, but the aspect specification makes the operation visible
451 -- to a client wherever the partial view is visible.
454 -- We start from the declaration node and then loop until the end of
455 -- the list until we find the requested attribute definition clause.
456 -- In Ada 2005 mode, clauses are ignored if they are not currently
457 -- visible (this is tested using the corresponding Entity, which is
458 -- inserted by the expander at the point where the clause occurs),
459 -- unless At_Any_Place is true.
461 Rep_Item
:= First_Rep_Item
(Typ
);
462 while Present
(Rep_Item
) loop
463 Real_Rep
:= Rep_Item
;
465 -- If the representation item is an aspect specification, retrieve
466 -- the corresponding pragma or attribute definition.
468 if Nkind
(Rep_Item
) = N_Aspect_Specification
then
469 Real_Rep
:= Aspect_Rep_Item
(Rep_Item
);
472 if Nkind
(Real_Rep
) = N_Attribute_Definition_Clause
then
473 case Chars
(Real_Rep
) is
475 exit when Nam
= TSS_Stream_Read
;
478 exit when Nam
= TSS_Stream_Write
;
481 exit when Nam
= TSS_Stream_Input
;
484 exit when Nam
= TSS_Stream_Output
;
492 Next_Rep_Item
(Rep_Item
);
495 -- If not found, and the type is derived from a private view, check
496 -- for a stream attribute inherited from parent. Any specified stream
497 -- attributes will be attached to the derived type's underlying type
498 -- rather the derived type entity itself (which is itself private).
501 and then Is_Private_Type
(Typ
)
502 and then Is_Derived_Type
(Typ
)
503 and then Present
(Full_View
(Typ
))
505 return Has_Stream_Attribute_Definition
506 (Underlying_Type
(Typ
), Nam
, At_Any_Place
);
508 -- Otherwise, if At_Any_Place is true, return True if the attribute is
509 -- available at any place; if it is false, return True only if the
510 -- attribute is currently visible.
513 return Present
(Rep_Item
)
514 and then (Ada_Version
< Ada_2005
516 or else not Is_Hidden
(Entity
(Rep_Item
)));
518 end Has_Stream_Attribute_Definition
;
520 ----------------------------
521 -- In_Package_Declaration --
522 ----------------------------
524 function In_Package_Declaration
return Boolean is
525 Unit_Kind
: constant Node_Kind
:=
526 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
529 -- There are no restrictions on the body of an RCI or RT unit
531 return Is_Package_Or_Generic_Package
(Current_Scope
)
532 and then Unit_Kind
/= N_Package_Body
533 and then not In_Package_Body
(Current_Scope
)
534 and then not In_Instance
;
535 end In_Package_Declaration
;
537 ---------------------------
538 -- In_Preelaborated_Unit --
539 ---------------------------
541 function In_Preelaborated_Unit
return Boolean is
542 Unit_Entity
: Entity_Id
:= Current_Scope
;
543 Unit_Kind
: constant Node_Kind
:=
544 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
547 -- If evaluating actuals for a child unit instantiation, then ignore
548 -- the preelaboration status of the parent; use the child instead.
550 if Is_Compilation_Unit
(Unit_Entity
)
551 and then Unit_Kind
in N_Generic_Instantiation
552 and then not In_Same_Source_Unit
(Unit_Entity
,
553 Cunit
(Current_Sem_Unit
))
555 Unit_Entity
:= Cunit_Entity
(Current_Sem_Unit
);
558 -- There are no constraints on the body of Remote_Call_Interface or
559 -- Remote_Types packages.
561 return (Unit_Entity
/= Standard_Standard
)
562 and then (Is_Preelaborated
(Unit_Entity
)
563 or else Is_Pure
(Unit_Entity
)
564 or else Is_Shared_Passive
(Unit_Entity
)
566 ((Is_Remote_Types
(Unit_Entity
)
567 or else Is_Remote_Call_Interface
(Unit_Entity
))
568 and then Ekind
(Unit_Entity
) = E_Package
569 and then Unit_Kind
/= N_Package_Body
570 and then not In_Package_Body
(Unit_Entity
)
571 and then not In_Instance
));
572 end In_Preelaborated_Unit
;
578 function In_Pure_Unit
return Boolean is
580 return Is_Pure
(Current_Scope
);
583 ------------------------
584 -- In_RCI_Declaration --
585 ------------------------
587 function In_RCI_Declaration
return Boolean is
589 return Is_Remote_Call_Interface
(Current_Scope
)
590 and then In_Package_Declaration
;
591 end In_RCI_Declaration
;
593 -----------------------
594 -- In_RT_Declaration --
595 -----------------------
597 function In_RT_Declaration
return Boolean is
599 return Is_Remote_Types
(Current_Scope
) and then In_Package_Declaration
;
600 end In_RT_Declaration
;
602 ----------------------------
603 -- In_Shared_Passive_Unit --
604 ----------------------------
606 function In_Shared_Passive_Unit
return Boolean is
607 Unit_Entity
: constant Entity_Id
:= Current_Scope
;
610 return Is_Shared_Passive
(Unit_Entity
);
611 end In_Shared_Passive_Unit
;
613 ---------------------------------------
614 -- In_Subprogram_Task_Protected_Unit --
615 ---------------------------------------
617 function In_Subprogram_Task_Protected_Unit
return Boolean is
621 -- The following is to verify that a declaration is inside
622 -- subprogram, generic subprogram, task unit, protected unit.
623 -- Used to validate if a lib. unit is Pure. RM 10.2.1(16).
625 -- Use scope chain to check successively outer scopes
629 if Is_Subprogram_Or_Generic_Subprogram
(E
)
631 Is_Concurrent_Type
(E
)
635 elsif E
= Standard_Standard
then
641 end In_Subprogram_Task_Protected_Unit
;
643 -------------------------------
644 -- Is_Non_Remote_Access_Type --
645 -------------------------------
647 function Is_Non_Remote_Access_Type
(E
: Entity_Id
) return Boolean is
648 U_E
: constant Entity_Id
:= Underlying_Type
(Base_Type
(E
));
649 -- Use full view of base type to handle subtypes properly.
654 -- This case arises for the case of a generic formal type, in which
655 -- case E.2.2(8) rules will be enforced at instantiation time.
660 return Is_Access_Type
(U_E
)
661 and then not Is_Remote_Access_To_Class_Wide_Type
(U_E
)
662 and then not Is_Remote_Access_To_Subprogram_Type
(U_E
);
663 end Is_Non_Remote_Access_Type
;
665 ---------------------------
666 -- No_External_Streaming --
667 ---------------------------
669 function No_External_Streaming
(E
: Entity_Id
) return Boolean is
670 U_E
: constant Entity_Id
:= Underlying_Type
(E
);
676 elsif Has_Read_Write_Attributes
(E
) then
678 -- Note: availability of stream attributes is tested on E, not U_E.
679 -- There may be stream attributes defined on U_E that are not visible
680 -- at the place where support of external streaming is tested.
684 elsif Has_Non_Remote_Access
(U_E
) then
688 return Is_Limited_Type
(E
);
689 end No_External_Streaming
;
691 -------------------------------------
692 -- Set_Categorization_From_Pragmas --
693 -------------------------------------
695 procedure Set_Categorization_From_Pragmas
(N
: Node_Id
) is
696 P
: constant Node_Id
:= Parent
(N
);
697 S
: constant Entity_Id
:= Current_Scope
;
699 procedure Set_Parents
(Visibility
: Boolean);
700 -- If this is a child instance, the parents are not immediately
701 -- visible during analysis. Make them momentarily visible so that
702 -- the argument of the pragma can be resolved properly, and reset
709 procedure Set_Parents
(Visibility
: Boolean) is
713 while Present
(Par
) and then Par
/= Standard_Standard
loop
714 Set_Is_Immediately_Visible
(Par
, Visibility
);
719 -- Start of processing for Set_Categorization_From_Pragmas
722 -- Deal with categorization pragmas in Pragmas of Compilation_Unit.
723 -- The purpose is to set categorization flags before analyzing the
724 -- unit itself, so as to diagnose violations of categorization as
725 -- we process each declaration, even though the pragma appears after
728 if Nkind
(P
) /= N_Compilation_Unit
then
736 if Is_Child_Unit
(S
) and then Is_Generic_Instance
(S
) then
740 PN
:= First
(Pragmas_After
(Aux_Decls_Node
(P
)));
741 while Present
(PN
) loop
743 -- Skip implicit types that may have been introduced by
744 -- previous analysis.
746 if Nkind
(PN
) = N_Pragma
then
747 case Get_Pragma_Id
(PN
) is
748 when Pragma_All_Calls_Remote |
749 Pragma_Preelaborate |
751 Pragma_Remote_Call_Interface |
752 Pragma_Remote_Types |
753 Pragma_Shared_Passive
=> Analyze
(PN
);
761 if Is_Child_Unit
(S
) and then Is_Generic_Instance
(S
) then
765 end Set_Categorization_From_Pragmas
;
767 -----------------------------------
768 -- Set_Categorization_From_Scope --
769 -----------------------------------
771 procedure Set_Categorization_From_Scope
(E
: Entity_Id
; Scop
: Entity_Id
) is
772 Declaration
: Node_Id
:= Empty
;
773 Specification
: Node_Id
:= Empty
;
777 (E
, Is_Pure
(Scop
) and then Is_Library_Level_Entity
(E
));
779 if not Is_Remote_Call_Interface
(E
) then
780 if Ekind
(E
) in Subprogram_Kind
then
781 Declaration
:= Unit_Declaration_Node
(E
);
783 if Nkind_In
(Declaration
, N_Subprogram_Body
,
784 N_Subprogram_Renaming_Declaration
)
786 Specification
:= Corresponding_Spec
(Declaration
);
790 -- A subprogram body or renaming-as-body is a remote call interface
791 -- if it serves as the completion of a subprogram declaration that
792 -- is a remote call interface.
794 if Nkind
(Specification
) in N_Entity
then
795 Set_Is_Remote_Call_Interface
796 (E
, Is_Remote_Call_Interface
(Specification
));
798 -- A subprogram declaration is a remote call interface when it is
799 -- declared within the visible part of, or declared by, a library
800 -- unit declaration that is a remote call interface.
803 Set_Is_Remote_Call_Interface
804 (E
, Is_Remote_Call_Interface
(Scop
)
805 and then not (In_Private_Part
(Scop
)
806 or else In_Package_Body
(Scop
)));
811 (E
, Is_Remote_Types
(Scop
)
812 and then not (In_Private_Part
(Scop
)
813 or else In_Package_Body
(Scop
)));
814 end Set_Categorization_From_Scope
;
816 ------------------------------
817 -- Static_Discriminant_Expr --
818 ------------------------------
820 -- We need to accommodate a Why_Not_Static call somehow here ???
822 function Static_Discriminant_Expr
(L
: List_Id
) return Boolean is
823 Discriminant_Spec
: Node_Id
;
826 Discriminant_Spec
:= First
(L
);
827 while Present
(Discriminant_Spec
) loop
828 if Present
(Expression
(Discriminant_Spec
))
830 not Is_OK_Static_Expression
(Expression
(Discriminant_Spec
))
835 Next
(Discriminant_Spec
);
839 end Static_Discriminant_Expr
;
841 --------------------------------------
842 -- Validate_Access_Type_Declaration --
843 --------------------------------------
845 procedure Validate_Access_Type_Declaration
(T
: Entity_Id
; N
: Node_Id
) is
846 Def
: constant Node_Id
:= Type_Definition
(N
);
851 -- Access to subprogram case
853 when N_Access_To_Subprogram_Definition
=>
855 -- A pure library_item must not contain the declaration of a
856 -- named access type, except within a subprogram, generic
857 -- subprogram, task unit, or protected unit (RM 10.2.1(16)).
859 -- This test is skipped in Ada 2005 (see AI-366)
861 if Ada_Version
< Ada_2005
862 and then Comes_From_Source
(T
)
863 and then In_Pure_Unit
864 and then not In_Subprogram_Task_Protected_Unit
866 Error_Msg_N
("named access type not allowed in pure unit", T
);
869 -- Access to object case
871 when N_Access_To_Object_Definition
=>
872 if Comes_From_Source
(T
)
873 and then In_Pure_Unit
874 and then not In_Subprogram_Task_Protected_Unit
876 -- We can't give the message yet, since the type is not frozen
877 -- and in Ada 2005 mode, access types are allowed in pure units
878 -- if the type has no storage pool (see AI-366). So we set a
879 -- flag which will be checked at freeze time.
881 Set_Is_Pure_Unit_Access_Type
(T
);
884 -- Check for RCI or RT unit type declaration: declaration of an
885 -- access-to-object type is illegal unless it is a general access
886 -- type that designates a class-wide limited private type.
887 -- Note that constraints on the primitive subprograms of the
888 -- designated tagged type are not enforced here but in
889 -- Validate_RACW_Primitives, which is done separately because the
890 -- designated type might not be frozen (and therefore its
891 -- primitive operations might not be completely known) at the
892 -- point of the RACW declaration.
894 Validate_Remote_Access_Object_Type_Declaration
(T
);
896 -- Check for shared passive unit type declaration. It should
897 -- not contain the declaration of access to class wide type,
898 -- access to task type and access to protected type with entry.
900 Validate_SP_Access_Object_Type_Decl
(T
);
906 -- Set categorization flag from package on entity as well, to allow
907 -- easy checks later on for required validations of RCI or RT units.
908 -- This is only done for entities that are in the original source.
910 if Comes_From_Source
(T
)
911 and then not (In_Package_Body
(Scope
(T
))
912 or else In_Private_Part
(Scope
(T
)))
914 Set_Is_Remote_Call_Interface
915 (T
, Is_Remote_Call_Interface
(Scope
(T
)));
917 (T
, Is_Remote_Types
(Scope
(T
)));
919 end Validate_Access_Type_Declaration
;
921 ----------------------------
922 -- Validate_Ancestor_Part --
923 ----------------------------
925 procedure Validate_Ancestor_Part
(N
: Node_Id
) is
926 A
: constant Node_Id
:= Ancestor_Part
(N
);
927 T
: constant Entity_Id
:= Entity
(A
);
930 if In_Preelaborated_Unit
931 and then not In_Subprogram_Or_Concurrent_Unit
932 and then (not Inside_A_Generic
933 or else Present
(Enclosing_Generic_Body
(N
)))
935 -- If the type is private, it must have the Ada 2005 pragma
936 -- Has_Preelaborable_Initialization.
938 -- The check is omitted within predefined units. This is probably
939 -- obsolete code to fix the Ada 95 weakness in this area ???
941 if Is_Private_Type
(T
)
942 and then not Has_Pragma_Preelab_Init
(T
)
943 and then not Is_Internal_File_Name
944 (Unit_File_Name
(Get_Source_Unit
(N
)))
947 ("private ancestor type not allowed in preelaborated unit", A
);
949 elsif Is_Record_Type
(T
) then
950 if Nkind
(Parent
(T
)) = N_Full_Type_Declaration
then
951 Check_Non_Static_Default_Expr
952 (Type_Definition
(Parent
(T
)), A
);
956 end Validate_Ancestor_Part
;
958 ----------------------------------------
959 -- Validate_Categorization_Dependency --
960 ----------------------------------------
962 procedure Validate_Categorization_Dependency
966 K
: constant Node_Kind
:= Nkind
(N
);
967 P
: Node_Id
:= Parent
(N
);
969 Is_Subunit
: constant Boolean := Nkind
(P
) = N_Subunit
;
972 -- Only validate library units and subunits. For subunits, checks
973 -- concerning withed units apply to the parent compilation unit.
980 and then not Is_Compilation_Unit
(U
)
981 and then not Is_Child_Unit
(U
)
987 if Nkind
(P
) /= N_Compilation_Unit
then
991 -- Body of RCI unit does not need validation
993 if Is_Remote_Call_Interface
(E
)
994 and then Nkind_In
(N
, N_Package_Body
, N_Subprogram_Body
)
999 -- Ada 2005 (AI-50217): Process explicit non-limited with_clauses
1003 Entity_Of_Withed
: Entity_Id
;
1006 Item
:= First
(Context_Items
(P
));
1007 while Present
(Item
) loop
1008 if Nkind
(Item
) = N_With_Clause
1009 and then not (Implicit_With
(Item
)
1010 or else Limited_Present
(Item
)
1012 -- Skip if error already posted on the WITH
1013 -- clause (in which case the Name attribute
1014 -- may be invalid). In particular, this fixes
1015 -- the problem of hanging in the presence of a
1016 -- WITH clause on a child that is an illegal
1017 -- generic instantiation.
1019 or else Error_Posted
(Item
))
1021 Entity_Of_Withed
:= Entity
(Name
(Item
));
1022 Check_Categorization_Dependencies
1023 (U
, Entity_Of_Withed
, Item
, Is_Subunit
);
1030 -- Child depends on parent; therefore parent should also be categorized
1031 -- and satisfy the dependency hierarchy.
1033 -- Check if N is a child spec
1035 if (K
in N_Generic_Declaration
or else
1036 K
in N_Generic_Instantiation
or else
1037 K
in N_Generic_Renaming_Declaration
or else
1038 K
= N_Package_Declaration
or else
1039 K
= N_Package_Renaming_Declaration
or else
1040 K
= N_Subprogram_Declaration
or else
1041 K
= N_Subprogram_Renaming_Declaration
)
1042 and then Present
(Parent_Spec
(N
))
1044 Check_Categorization_Dependencies
(E
, Scope
(E
), N
, False);
1046 -- Verify that public child of an RCI library unit must also be an
1047 -- RCI library unit (RM E.2.3(15)).
1049 if Is_Remote_Call_Interface
(Scope
(E
))
1050 and then not Private_Present
(P
)
1051 and then not Is_Remote_Call_Interface
(E
)
1053 Error_Msg_N
("public child of rci unit must also be rci unit", N
);
1056 end Validate_Categorization_Dependency
;
1058 --------------------------------
1059 -- Validate_Controlled_Object --
1060 --------------------------------
1062 procedure Validate_Controlled_Object
(E
: Entity_Id
) is
1064 -- Don't need this check in Ada 2005 mode, where this is all taken
1065 -- care of by the mechanism for Preelaborable Initialization.
1067 if Ada_Version
>= Ada_2005
then
1071 -- For now, never apply this check for internal GNAT units, since we
1072 -- have a number of cases in the library where we are stuck with objects
1073 -- of this type, and the RM requires Preelaborate.
1075 -- For similar reasons, we only do this check for source entities, since
1076 -- we generate entities of this type in some situations.
1078 -- Note that the 10.2.1(9) restrictions are not relevant to us anyway.
1079 -- We have to enforce them for RM compatibility, but we have no trouble
1080 -- accepting these objects and doing the right thing. Note that there is
1081 -- no requirement that Preelaborate not actually generate any code.
1083 if In_Preelaborated_Unit
1084 and then not Debug_Flag_PP
1085 and then Comes_From_Source
(E
)
1087 Is_Internal_File_Name
(Unit_File_Name
(Get_Source_Unit
(E
)))
1088 and then (not Inside_A_Generic
1089 or else Present
(Enclosing_Generic_Body
(E
)))
1090 and then not Is_Protected_Type
(Etype
(E
))
1093 ("library level controlled object not allowed in " &
1094 "preelaborated unit", E
);
1096 end Validate_Controlled_Object
;
1098 --------------------------------------
1099 -- Validate_Null_Statement_Sequence --
1100 --------------------------------------
1102 procedure Validate_Null_Statement_Sequence
(N
: Node_Id
) is
1106 if In_Preelaborated_Unit
then
1107 Item
:= First
(Statements
(Handled_Statement_Sequence
(N
)));
1108 while Present
(Item
) loop
1109 if Nkind
(Item
) /= N_Label
1110 and then Nkind
(Item
) /= N_Null_Statement
1112 -- In GNAT mode, this is a warning, allowing the run-time
1113 -- to judiciously bypass this error condition.
1115 Error_Msg_Warn
:= GNAT_Mode
;
1117 ("<<statements not allowed in preelaborated unit", Item
);
1125 end Validate_Null_Statement_Sequence
;
1127 ---------------------------------
1128 -- Validate_Object_Declaration --
1129 ---------------------------------
1131 procedure Validate_Object_Declaration
(N
: Node_Id
) is
1132 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1133 E
: constant Node_Id
:= Expression
(N
);
1134 Odf
: constant Node_Id
:= Object_Definition
(N
);
1135 T
: constant Entity_Id
:= Etype
(Id
);
1138 -- Verify that any access to subprogram object does not have in its
1139 -- subprogram profile access type parameters or limited parameters
1140 -- without Read and Write attributes (E.2.3(13)).
1142 Validate_RCI_Subprogram_Declaration
(N
);
1144 -- Check that if we are in preelaborated elaboration code, then we
1145 -- do not have an instance of a default initialized private, task or
1146 -- protected object declaration which would violate (RM 10.2.1(9)).
1147 -- Note that constants are never default initialized (and the test
1148 -- below also filters out deferred constants). A variable is default
1149 -- initialized if it does *not* have an initialization expression.
1151 -- Filter out cases that are not declaration of a variable from source
1153 if Nkind
(N
) /= N_Object_Declaration
1154 or else Constant_Present
(N
)
1155 or else not Comes_From_Source
(Id
)
1160 -- Exclude generic specs from the checks (this will get rechecked
1161 -- on instantiations).
1163 if Inside_A_Generic
and then No
(Enclosing_Generic_Body
(Id
)) then
1167 -- Required checks for declaration that is in a preelaborated package
1168 -- and is not within some subprogram.
1170 if In_Preelaborated_Unit
1171 and then not In_Subprogram_Or_Concurrent_Unit
1173 -- Check for default initialized variable case. Note that in
1174 -- accordance with (RM B.1(24)) imported objects are not subject to
1175 -- default initialization.
1176 -- If the initialization does not come from source and is an
1177 -- aggregate, it is a static initialization that replaces an
1178 -- implicit call, and must be treated as such.
1181 and then (Comes_From_Source
(E
) or else Nkind
(E
) /= N_Aggregate
)
1185 elsif Is_Imported
(Id
) then
1190 Ent
: Entity_Id
:= T
;
1193 -- An array whose component type is a record with nonstatic
1194 -- default expressions is a violation, so we get the array's
1197 if Is_Array_Type
(Ent
) then
1199 Comp_Type
: Entity_Id
;
1202 Comp_Type
:= Component_Type
(Ent
);
1203 while Is_Array_Type
(Comp_Type
) loop
1204 Comp_Type
:= Component_Type
(Comp_Type
);
1211 -- Object decl. that is of record type and has no default expr.
1212 -- should check if there is any non-static default expression
1213 -- in component decl. of the record type decl.
1215 if Is_Record_Type
(Ent
) then
1216 if Nkind
(Parent
(Ent
)) = N_Full_Type_Declaration
then
1217 Check_Non_Static_Default_Expr
1218 (Type_Definition
(Parent
(Ent
)), N
);
1220 elsif Nkind
(Odf
) = N_Subtype_Indication
1221 and then not Is_Array_Type
(T
)
1222 and then not Is_Private_Type
(T
)
1224 Check_Non_Static_Default_Expr
(Type_Definition
1225 (Parent
(Entity
(Subtype_Mark
(Odf
)))), N
);
1229 -- Check for invalid use of private object. Note that Ada 2005
1230 -- AI-161 modifies the rules for Ada 2005, including the use of
1231 -- the new pragma Preelaborable_Initialization.
1233 if Is_Private_Type
(Ent
)
1234 or else Depends_On_Private
(Ent
)
1236 -- Case where type has preelaborable initialization which
1237 -- means that a pragma Preelaborable_Initialization was
1238 -- given for the private type.
1240 if Relaxed_RM_Semantics
then
1242 -- In relaxed mode, do not issue these messages, this
1243 -- is basically similar to the GNAT_Mode test below.
1247 elsif Has_Preelaborable_Initialization
(Ent
) then
1249 -- But for the predefined units, we will ignore this
1250 -- status unless we are in Ada 2005 mode since we want
1251 -- Ada 95 compatible behavior, in which the entities
1252 -- marked with this pragma in the predefined library are
1253 -- not treated specially.
1255 if Ada_Version
< Ada_2005
then
1257 ("private object not allowed in preelaborated unit",
1259 Error_Msg_N
("\(would be legal in Ada 2005 mode)", N
);
1262 -- Type does not have preelaborable initialization
1265 -- We allow this when compiling in GNAT mode to make life
1266 -- easier for some cases where it would otherwise be hard
1267 -- to be exactly valid Ada.
1269 if not GNAT_Mode
then
1271 ("private object not allowed in preelaborated unit",
1274 -- Add a message if it would help to provide a pragma
1275 -- Preelaborable_Initialization on the type of the
1276 -- object (which would make it legal in Ada 2005).
1278 -- If the type has no full view (generic type, or
1279 -- previous error), the warning does not apply.
1281 if Is_Private_Type
(Ent
)
1282 and then Present
(Full_View
(Ent
))
1284 Has_Preelaborable_Initialization
(Full_View
(Ent
))
1286 Error_Msg_Sloc
:= Sloc
(Ent
);
1288 if Ada_Version
>= Ada_2005
then
1290 ("\would be legal if pragma Preelaborable_" &
1291 "Initialization given for & #", N
, Ent
);
1294 ("\would be legal in Ada 2005 if pragma " &
1295 "Preelaborable_Initialization given for & #",
1302 -- Access to Task or Protected type
1304 elsif Is_Entity_Name
(Odf
)
1305 and then Present
(Etype
(Odf
))
1306 and then Is_Access_Type
(Etype
(Odf
))
1308 Ent
:= Designated_Type
(Etype
(Odf
));
1310 elsif Is_Entity_Name
(Odf
) then
1311 Ent
:= Entity
(Odf
);
1313 elsif Nkind
(Odf
) = N_Subtype_Indication
then
1314 Ent
:= Etype
(Subtype_Mark
(Odf
));
1316 elsif Nkind
(Odf
) = N_Constrained_Array_Definition
then
1317 Ent
:= Component_Type
(T
);
1320 if Is_Task_Type
(Ent
)
1321 or else (Is_Protected_Type
(Ent
) and then Has_Entries
(Ent
))
1324 ("concurrent object not allowed in preelaborated unit",
1331 -- Non-static discriminants not allowed in preelaborated unit.
1332 -- Objects of a controlled type with a user-defined Initialize
1333 -- are forbidden as well.
1335 if Is_Record_Type
(Etype
(Id
)) then
1337 ET
: constant Entity_Id
:= Etype
(Id
);
1338 EE
: constant Entity_Id
:= Etype
(Etype
(Id
));
1342 if Has_Discriminants
(ET
) and then Present
(EE
) then
1345 if Nkind
(PEE
) = N_Full_Type_Declaration
1346 and then not Static_Discriminant_Expr
1347 (Discriminant_Specifications
(PEE
))
1350 ("non-static discriminant in preelaborated unit",
1355 -- For controlled type or type with controlled component, check
1356 -- preelaboration flag, as there may be a non-null Initialize
1357 -- primitive. For language versions earlier than Ada 2005,
1358 -- there is no notion of preelaborable initialization, and
1359 -- Validate_Controlled_Object is used to enforce rules for
1360 -- controlled objects.
1362 if (Is_Controlled
(ET
) or else Has_Controlled_Component
(ET
))
1363 and then Ada_Version
>= Ada_2005
1364 and then not Has_Preelaborable_Initialization
(ET
)
1367 ("controlled type& does not have"
1368 & " preelaborable initialization", N
, ET
);
1375 -- A pure library_item must not contain the declaration of any variable
1376 -- except within a subprogram, generic subprogram, task unit, or
1377 -- protected unit (RM 10.2.1(16)).
1379 if In_Pure_Unit
and then not In_Subprogram_Task_Protected_Unit
then
1380 Error_Msg_N
("declaration of variable not allowed in pure unit", N
);
1382 elsif not In_Private_Part
(Id
) then
1384 -- The visible part of an RCI library unit must not contain the
1385 -- declaration of a variable (RM E.1.3(9)).
1387 if In_RCI_Declaration
then
1388 Error_Msg_N
("visible variable not allowed in 'R'C'I unit", N
);
1390 -- The visible part of a Shared Passive library unit must not contain
1391 -- the declaration of a variable (RM E.2.2(7)).
1393 elsif In_RT_Declaration
then
1395 ("visible variable not allowed in remote types unit", N
);
1398 end Validate_Object_Declaration
;
1400 -----------------------------
1401 -- Validate_RACW_Primitive --
1402 -----------------------------
1404 procedure Validate_RACW_Primitive
1408 procedure Illegal_Remote_Subp
(Msg
: String; N
: Node_Id
);
1409 -- Diagnose illegality on N. If RACW is present, report the error on it
1410 -- rather than on N.
1412 -------------------------
1413 -- Illegal_Remote_Subp --
1414 -------------------------
1416 procedure Illegal_Remote_Subp
(Msg
: String; N
: Node_Id
) is
1418 if Present
(RACW
) then
1419 if not Error_Posted
(RACW
) then
1421 ("illegal remote access to class-wide type&", RACW
);
1424 Error_Msg_Sloc
:= Sloc
(N
);
1425 Error_Msg_NE
("\\" & Msg
& " in primitive& #", RACW
, Subp
);
1428 Error_Msg_NE
(Msg
& " in remote subprogram&", N
, Subp
);
1430 end Illegal_Remote_Subp
;
1434 Param_Spec
: Node_Id
;
1435 Param_Type
: Entity_Id
;
1437 -- Start of processing for Validate_RACW_Primitive
1440 -- Check return type
1442 if Ekind
(Subp
) = E_Function
then
1443 Rtyp
:= Etype
(Subp
);
1445 -- AI05-0101 (Binding Interpretation): The result type of a remote
1446 -- function must either support external streaming or be a
1447 -- controlling access result type.
1449 if Has_Controlling_Result
(Subp
) then
1452 elsif Ekind
(Rtyp
) = E_Anonymous_Access_Type
then
1453 Illegal_Remote_Subp
("anonymous access result", Rtyp
);
1455 elsif Is_Limited_Type
(Rtyp
) then
1456 if No
(TSS
(Rtyp
, TSS_Stream_Read
))
1458 No
(TSS
(Rtyp
, TSS_Stream_Write
))
1461 ("limited return type must have Read and Write attributes",
1463 Explain_Limited_Type
(Rtyp
, Parent
(Subp
));
1466 -- Check that the return type supports external streaming
1468 elsif No_External_Streaming
(Rtyp
)
1469 and then not Error_Posted
(Rtyp
)
1471 Illegal_Remote_Subp
("return type containing non-remote access "
1472 & "must have Read and Write attributes",
1477 Param
:= First_Formal
(Subp
);
1478 while Present
(Param
) loop
1480 -- Now find out if this parameter is a controlling parameter
1482 Param_Spec
:= Parent
(Param
);
1483 Param_Type
:= Etype
(Param
);
1485 if Is_Controlling_Formal
(Param
) then
1487 -- It is a controlling parameter, so specific checks below do not
1492 elsif Ekind_In
(Param_Type
, E_Anonymous_Access_Type
,
1493 E_Anonymous_Access_Subprogram_Type
)
1495 -- From RM E.2.2(14), no anonymous access parameter other than
1496 -- controlling ones may be used (because an anonymous access
1497 -- type never supports external streaming).
1500 ("non-controlling access parameter", Param_Spec
);
1502 elsif No_External_Streaming
(Param_Type
)
1503 and then not Error_Posted
(Param_Type
)
1505 Illegal_Remote_Subp
("formal parameter in remote subprogram must "
1506 & "support external streaming", Param_Spec
);
1509 -- Check next parameter in this subprogram
1511 Next_Formal
(Param
);
1513 end Validate_RACW_Primitive
;
1515 ------------------------------
1516 -- Validate_RACW_Primitives --
1517 ------------------------------
1519 procedure Validate_RACW_Primitives
(T
: Entity_Id
) is
1520 Desig_Type
: Entity_Id
;
1521 Primitive_Subprograms
: Elist_Id
;
1522 Subprogram_Elmt
: Elmt_Id
;
1523 Subprogram
: Entity_Id
;
1526 Desig_Type
:= Etype
(Designated_Type
(T
));
1528 -- No action needed for concurrent types
1530 if Is_Concurrent_Type
(Desig_Type
) then
1534 Primitive_Subprograms
:= Primitive_Operations
(Desig_Type
);
1536 Subprogram_Elmt
:= First_Elmt
(Primitive_Subprograms
);
1537 while Subprogram_Elmt
/= No_Elmt
loop
1538 Subprogram
:= Node
(Subprogram_Elmt
);
1540 if Is_Predefined_Dispatching_Operation
(Subprogram
)
1541 or else Is_Hidden
(Subprogram
)
1543 goto Next_Subprogram
;
1546 Validate_RACW_Primitive
(Subp
=> Subprogram
, RACW
=> T
);
1549 Next_Elmt
(Subprogram_Elmt
);
1551 end Validate_RACW_Primitives
;
1553 -------------------------------
1554 -- Validate_RCI_Declarations --
1555 -------------------------------
1557 procedure Validate_RCI_Declarations
(P
: Entity_Id
) is
1561 E
:= First_Entity
(P
);
1562 while Present
(E
) loop
1563 if Comes_From_Source
(E
) then
1564 if Is_Limited_Type
(E
) then
1566 ("limited type not allowed in rci unit", Parent
(E
));
1567 Explain_Limited_Type
(E
, Parent
(E
));
1569 elsif Ekind_In
(E
, E_Generic_Function
,
1571 E_Generic_Procedure
)
1573 Error_Msg_N
("generic declaration not allowed in rci unit",
1576 elsif (Ekind
(E
) = E_Function
or else Ekind
(E
) = E_Procedure
)
1577 and then Has_Pragma_Inline
(E
)
1580 ("inlined subprogram not allowed in rci unit", Parent
(E
));
1582 -- Inner packages that are renamings need not be checked. Generic
1583 -- RCI packages are subject to the checks, but entities that come
1584 -- from formal packages are not part of the visible declarations
1585 -- of the package and are not checked.
1587 elsif Ekind
(E
) = E_Package
then
1588 if Present
(Renamed_Entity
(E
)) then
1591 elsif Ekind
(P
) /= E_Generic_Package
1592 or else List_Containing
(Unit_Declaration_Node
(E
)) /=
1593 Generic_Formal_Declarations
1594 (Unit_Declaration_Node
(P
))
1596 Validate_RCI_Declarations
(E
);
1603 end Validate_RCI_Declarations
;
1605 -----------------------------------------
1606 -- Validate_RCI_Subprogram_Declaration --
1607 -----------------------------------------
1609 procedure Validate_RCI_Subprogram_Declaration
(N
: Node_Id
) is
1610 K
: constant Node_Kind
:= Nkind
(N
);
1612 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1613 Param_Spec
: Node_Id
;
1614 Param_Type
: Entity_Id
;
1615 Error_Node
: Node_Id
:= N
;
1618 -- This procedure enforces rules on subprogram and access to subprogram
1619 -- declarations in RCI units. These rules do not apply to expander
1620 -- generated routines, which are not remote subprograms. It is called:
1622 -- 1. from Analyze_Subprogram_Declaration.
1623 -- 2. from Validate_Object_Declaration (access to subprogram).
1625 if not (Comes_From_Source
(N
)
1626 and then In_RCI_Declaration
1627 and then not In_Private_Part
(Scope
(Id
)))
1632 if K
= N_Subprogram_Declaration
then
1633 Profile
:= Parameter_Specifications
(Specification
(N
));
1636 pragma Assert
(K
= N_Object_Declaration
);
1638 -- The above assertion is dubious, the visible declarations of an
1639 -- RCI unit never contain an object declaration, this should be an
1640 -- ACCESS-to-object declaration???
1642 if Nkind
(Id
) = N_Defining_Identifier
1643 and then Nkind
(Parent
(Etype
(Id
))) = N_Full_Type_Declaration
1644 and then Ekind
(Etype
(Id
)) = E_Access_Subprogram_Type
1647 Parameter_Specifications
(Type_Definition
(Parent
(Etype
(Id
))));
1653 -- Iterate through the parameter specification list, checking that
1654 -- no access parameter and no limited type parameter in the list.
1657 if Present
(Profile
) then
1658 Param_Spec
:= First
(Profile
);
1659 while Present
(Param_Spec
) loop
1660 Param_Type
:= Etype
(Defining_Identifier
(Param_Spec
));
1662 if Ekind
(Param_Type
) = E_Anonymous_Access_Type
then
1663 if K
= N_Subprogram_Declaration
then
1664 Error_Node
:= Param_Spec
;
1667 -- Report error only if declaration is in source program
1669 if Comes_From_Source
(Id
) then
1671 ("subprogram in 'R'C'I unit cannot have access parameter",
1675 -- For a limited private type parameter, we check only the private
1676 -- declaration and ignore full type declaration, unless this is
1677 -- the only declaration for the type, e.g., as a limited record.
1679 elsif No_External_Streaming
(Param_Type
) then
1680 if K
= N_Subprogram_Declaration
then
1681 Error_Node
:= Param_Spec
;
1685 ("formal of remote subprogram& "
1686 & "must support external streaming",
1688 if Is_Limited_Type
(Param_Type
) then
1689 Explain_Limited_Type
(Param_Type
, Error_Node
);
1697 if Ekind
(Id
) = E_Function
1698 and then Ekind
(Etype
(Id
)) = E_Anonymous_Access_Type
1699 and then Comes_From_Source
(Id
)
1702 ("function in 'R'C'I unit cannot have access result",
1705 end Validate_RCI_Subprogram_Declaration
;
1707 ----------------------------------------------------
1708 -- Validate_Remote_Access_Object_Type_Declaration --
1709 ----------------------------------------------------
1711 procedure Validate_Remote_Access_Object_Type_Declaration
(T
: Entity_Id
) is
1712 Direct_Designated_Type
: Entity_Id
;
1713 Desig_Type
: Entity_Id
;
1716 -- We are called from Analyze_Full_Type_Declaration, and the Nkind of
1717 -- the given node is N_Access_To_Object_Definition.
1719 if not Comes_From_Source
(T
)
1720 or else (not In_RCI_Declaration
and then not In_RT_Declaration
)
1725 -- An access definition in the private part of a package is not a
1726 -- remote access type. Restrictions related to external streaming
1727 -- support for non-remote access types are enforced elsewhere. Note
1728 -- that In_Private_Part is never set on type entities: check flag
1729 -- on enclosing scope.
1731 if In_Private_Part
(Scope
(T
)) then
1735 -- Check RCI or RT unit type declaration. It may not contain the
1736 -- declaration of an access-to-object type unless it is a general access
1737 -- type that designates a class-wide limited private type or subtype.
1738 -- There are also constraints on the primitive subprograms of the
1739 -- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives).
1741 if Ekind
(T
) /= E_General_Access_Type
1742 or else not Is_Class_Wide_Type
(Designated_Type
(T
))
1744 if In_RCI_Declaration
then
1746 ("error in access type in Remote_Call_Interface unit", T
);
1749 ("error in access type in Remote_Types unit", T
);
1752 Error_Msg_N
("\must be general access to class-wide type", T
);
1756 Direct_Designated_Type
:= Designated_Type
(T
);
1757 Desig_Type
:= Etype
(Direct_Designated_Type
);
1759 -- Why is this check not in Validate_Remote_Access_To_Class_Wide_Type???
1761 if not Is_Valid_Remote_Object_Type
(Desig_Type
) then
1763 ("error in designated type of remote access to class-wide type", T
);
1765 ("\must be tagged limited private or private extension", T
);
1768 end Validate_Remote_Access_Object_Type_Declaration
;
1770 -----------------------------------------------
1771 -- Validate_Remote_Access_To_Class_Wide_Type --
1772 -----------------------------------------------
1774 procedure Validate_Remote_Access_To_Class_Wide_Type
(N
: Node_Id
) is
1775 K
: constant Node_Kind
:= Nkind
(N
);
1776 PK
: constant Node_Kind
:= Nkind
(Parent
(N
));
1780 -- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses
1781 -- of class-wide limited private types.
1783 -- Storage_Pool and Storage_Size are not defined for such types
1785 -- The expected type of allocator must not be such a type.
1787 -- The actual parameter of generic instantiation must not be such a
1788 -- type if the formal parameter is of an access type.
1790 -- On entry, there are several cases:
1792 -- 1. called from sem_attr Analyze_Attribute where attribute name is
1793 -- either Storage_Pool or Storage_Size.
1795 -- 2. called from exp_ch4 Expand_N_Allocator
1797 -- 3. called from sem_ch4 Analyze_Explicit_Dereference
1799 -- 4. called from sem_res Resolve_Actuals
1801 if K
= N_Attribute_Reference
then
1802 E
:= Etype
(Prefix
(N
));
1804 if Is_Remote_Access_To_Class_Wide_Type
(E
) then
1805 Error_Msg_N
("incorrect attribute of remote operand", N
);
1809 elsif K
= N_Allocator
then
1812 if Is_Remote_Access_To_Class_Wide_Type
(E
) then
1813 Error_Msg_N
("incorrect expected remote type of allocator", N
);
1817 -- This subprogram also enforces the checks in E.2.2(13). A value of
1818 -- such type must not be dereferenced unless as controlling operand of
1819 -- a dispatching call. Explicit dereferences not coming from source are
1820 -- exempted from this checking because the expander produces them in
1821 -- some cases (such as for tag checks on dispatching calls with multiple
1822 -- controlling operands). However we do check in the case of an implicit
1823 -- dereference that is expanded to an explicit dereference (hence the
1824 -- test of whether Original_Node (N) comes from source).
1826 elsif K
= N_Explicit_Dereference
1827 and then Comes_From_Source
(Original_Node
(N
))
1829 E
:= Etype
(Prefix
(N
));
1831 -- If the class-wide type is not a remote one, the restrictions
1834 if not Is_Remote_Access_To_Class_Wide_Type
(E
) then
1838 -- If we have a true dereference that comes from source and that
1839 -- is a controlling argument for a dispatching call, accept it.
1841 if Is_Actual_Parameter
(N
) and then Is_Controlling_Actual
(N
) then
1845 -- If we are just within a procedure or function call and the
1846 -- dereference has not been analyzed, return because this procedure
1847 -- will be called again from sem_res Resolve_Actuals. The same can
1848 -- apply in the case of dereference that is the prefix of a selected
1849 -- component, which can be a call given in prefixed form.
1851 if (Is_Actual_Parameter
(N
) or else PK
= N_Selected_Component
)
1852 and then not Analyzed
(N
)
1857 -- We must allow expanded code to generate a reference to the tag of
1858 -- the designated object (may be either the actual tag, or the stub
1859 -- tag in the case of a remote object).
1861 if PK
= N_Selected_Component
1862 and then Is_Tag
(Entity
(Selector_Name
(Parent
(N
))))
1868 ("invalid dereference of a remote access-to-class-wide value", N
);
1870 end Validate_Remote_Access_To_Class_Wide_Type
;
1872 ------------------------------------------
1873 -- Validate_Remote_Type_Type_Conversion --
1874 ------------------------------------------
1876 procedure Validate_Remote_Type_Type_Conversion
(N
: Node_Id
) is
1877 S
: constant Entity_Id
:= Etype
(N
);
1878 E
: constant Entity_Id
:= Etype
(Expression
(N
));
1881 -- This test is required in the case where a conversion appears inside a
1882 -- normal package, it does not necessarily have to be inside an RCI,
1883 -- Remote_Types unit (RM E.2.2(9,12)).
1885 if Is_Remote_Access_To_Subprogram_Type
(E
)
1886 and then not Is_Remote_Access_To_Subprogram_Type
(S
)
1889 ("incorrect conversion of remote operand to local type", N
);
1892 elsif not Is_Remote_Access_To_Subprogram_Type
(E
)
1893 and then Is_Remote_Access_To_Subprogram_Type
(S
)
1896 ("incorrect conversion of local operand to remote type", N
);
1899 elsif Is_Remote_Access_To_Class_Wide_Type
(E
)
1900 and then not Is_Remote_Access_To_Class_Wide_Type
(S
)
1903 ("incorrect conversion of remote operand to local type", N
);
1907 -- If a local access type is converted into a RACW type, then the
1908 -- current unit has a pointer that may now be exported to another
1911 if Is_Remote_Access_To_Class_Wide_Type
(S
)
1912 and then not Is_Remote_Access_To_Class_Wide_Type
(E
)
1914 Set_Has_RACW
(Current_Sem_Unit
);
1916 end Validate_Remote_Type_Type_Conversion
;
1918 -------------------------------
1919 -- Validate_RT_RAT_Component --
1920 -------------------------------
1922 procedure Validate_RT_RAT_Component
(N
: Node_Id
) is
1923 Spec
: constant Node_Id
:= Specification
(N
);
1924 Name_U
: constant Entity_Id
:= Defining_Entity
(Spec
);
1927 First_Priv_Ent
: constant Entity_Id
:= First_Private_Entity
(Name_U
);
1929 function Stream_Attributes_Available
(Typ
: Entity_Id
) return Boolean;
1930 -- True if any stream attribute is available for Typ
1932 ---------------------------------
1933 -- Stream_Attributes_Available --
1934 ---------------------------------
1936 function Stream_Attributes_Available
(Typ
: Entity_Id
) return Boolean
1939 return Stream_Attribute_Available
(Typ
, TSS_Stream_Read
)
1941 Stream_Attribute_Available
(Typ
, TSS_Stream_Write
)
1943 Stream_Attribute_Available
(Typ
, TSS_Stream_Input
)
1945 Stream_Attribute_Available
(Typ
, TSS_Stream_Output
);
1946 end Stream_Attributes_Available
;
1948 -- Start of processing for Validate_RT_RAT_Component
1951 if not Is_Remote_Types
(Name_U
) then
1955 Typ
:= First_Entity
(Name_U
);
1956 while Present
(Typ
) and then Typ
/= First_Priv_Ent
loop
1957 U_Typ
:= Underlying_Type
(Base_Type
(Typ
));
1963 if Comes_From_Source
(Typ
) and then Is_Type
(Typ
) then
1965 -- Check that the type can be meaningfully transmitted to another
1966 -- partition (E.2.2(8)).
1968 if (Ada_Version
< Ada_2005
and then Has_Non_Remote_Access
(U_Typ
))
1969 or else (Stream_Attributes_Available
(Typ
)
1970 and then No_External_Streaming
(U_Typ
))
1972 if Is_Non_Remote_Access_Type
(Typ
) then
1973 Error_Msg_N
("error in non-remote access type", U_Typ
);
1976 ("error in record type containing a component of a " &
1977 "non-remote access type", U_Typ
);
1980 if Ada_Version
>= Ada_2005
then
1982 ("\must have visible Read and Write attribute " &
1983 "definition clauses (RM E.2.2(8))", U_Typ
);
1986 ("\must have Read and Write attribute " &
1987 "definition clauses (RM E.2.2(8))", U_Typ
);
1994 end Validate_RT_RAT_Component
;
1996 -----------------------------------------
1997 -- Validate_SP_Access_Object_Type_Decl --
1998 -----------------------------------------
2000 procedure Validate_SP_Access_Object_Type_Decl
(T
: Entity_Id
) is
2001 Direct_Designated_Type
: Entity_Id
;
2003 function Has_Entry_Declarations
(E
: Entity_Id
) return Boolean;
2004 -- Return true if the protected type designated by T has entry
2007 ----------------------------
2008 -- Has_Entry_Declarations --
2009 ----------------------------
2011 function Has_Entry_Declarations
(E
: Entity_Id
) return Boolean is
2015 if Nkind
(Parent
(E
)) = N_Protected_Type_Declaration
then
2016 Ety
:= First_Entity
(E
);
2017 while Present
(Ety
) loop
2018 if Ekind
(Ety
) = E_Entry
then
2027 end Has_Entry_Declarations
;
2029 -- Start of processing for Validate_SP_Access_Object_Type_Decl
2032 -- We are called from Sem_Ch3.Analyze_Full_Type_Declaration, and the
2033 -- Nkind of the given entity is N_Access_To_Object_Definition.
2035 if not Comes_From_Source
(T
)
2036 or else not In_Shared_Passive_Unit
2037 or else In_Subprogram_Task_Protected_Unit
2042 -- Check Shared Passive unit. It should not contain the declaration
2043 -- of an access-to-object type whose designated type is a class-wide
2044 -- type, task type or protected type with entry (RM E.2.1(7)).
2046 Direct_Designated_Type
:= Designated_Type
(T
);
2048 if Ekind
(Direct_Designated_Type
) = E_Class_Wide_Type
then
2050 ("invalid access-to-class-wide type in shared passive unit", T
);
2053 elsif Ekind
(Direct_Designated_Type
) in Task_Kind
then
2055 ("invalid access-to-task type in shared passive unit", T
);
2058 elsif Ekind
(Direct_Designated_Type
) in Protected_Kind
2059 and then Has_Entry_Declarations
(Direct_Designated_Type
)
2062 ("invalid access-to-protected type in shared passive unit", T
);
2065 end Validate_SP_Access_Object_Type_Decl
;
2067 ---------------------------------
2068 -- Validate_Static_Object_Name --
2069 ---------------------------------
2071 procedure Validate_Static_Object_Name
(N
: Node_Id
) is
2075 function Is_Primary
(N
: Node_Id
) return Boolean;
2076 -- Determine whether node is syntactically a primary in an expression
2077 -- This function should probably be somewhere else ???
2079 -- Also it does not do what it says, e.g if N is a binary operator
2080 -- whose parent is a binary operator, Is_Primary returns True ???
2086 function Is_Primary
(N
: Node_Id
) return Boolean is
2087 K
: constant Node_Kind
:= Nkind
(Parent
(N
));
2091 when N_Op | N_Membership_Test
=>
2095 | N_Component_Association
2096 | N_Index_Or_Discriminant_Constraint
=>
2099 when N_Attribute_Reference
=>
2100 return Attribute_Name
(Parent
(N
)) /= Name_Address
2101 and then Attribute_Name
(Parent
(N
)) /= Name_Access
2102 and then Attribute_Name
(Parent
(N
)) /= Name_Unchecked_Access
2104 Attribute_Name
(Parent
(N
)) /= Name_Unrestricted_Access
;
2106 when N_Indexed_Component
=>
2107 return (N
/= Prefix
(Parent
(N
))
2108 or else Is_Primary
(Parent
(N
)));
2110 when N_Qualified_Expression | N_Type_Conversion
=>
2111 return Is_Primary
(Parent
(N
));
2113 when N_Assignment_Statement | N_Object_Declaration
=>
2114 return (N
= Expression
(Parent
(N
)));
2116 when N_Selected_Component
=>
2117 return Is_Primary
(Parent
(N
));
2124 -- Start of processing for Validate_Static_Object_Name
2127 if not In_Preelaborated_Unit
2128 or else not Comes_From_Source
(N
)
2129 or else In_Subprogram_Or_Concurrent_Unit
2130 or else Ekind
(Current_Scope
) = E_Block
2134 -- Filter out cases where primary is default in a component declaration,
2135 -- discriminant specification, or actual in a record type initialization
2138 -- Initialization call of internal types
2140 elsif Nkind
(Parent
(N
)) = N_Procedure_Call_Statement
then
2142 if Present
(Parent
(Parent
(N
)))
2143 and then Nkind
(Parent
(Parent
(N
))) = N_Freeze_Entity
2148 if Nkind
(Name
(Parent
(N
))) = N_Identifier
2149 and then not Comes_From_Source
(Entity
(Name
(Parent
(N
))))
2155 -- Error if the name is a primary in an expression. The parent must not
2156 -- be an operator, or a selected component or an indexed component that
2157 -- is itself a primary. Entities that are actuals do not need to be
2158 -- checked, because the call itself will be diagnosed.
2161 and then (not Inside_A_Generic
2162 or else Present
(Enclosing_Generic_Body
(N
)))
2164 if Ekind
(Entity
(N
)) = E_Variable
2165 or else Ekind
(Entity
(N
)) in Formal_Object_Kind
2167 Flag_Non_Static_Expr
2168 ("non-static object name in preelaborated unit", N
);
2170 -- Give an error for a reference to a nonstatic constant, unless the
2171 -- constant is in another GNAT library unit that is preelaborable.
2173 elsif Ekind
(Entity
(N
)) = E_Constant
2174 and then not Is_Static_Expression
(N
)
2177 Val
:= Constant_Value
(E
);
2179 if Is_Internal_File_Name
(Unit_File_Name
(Get_Source_Unit
(N
)))
2181 Enclosing_Comp_Unit_Node
(N
) /= Enclosing_Comp_Unit_Node
(E
)
2182 and then (Is_Preelaborated
(Scope
(E
))
2183 or else Is_Pure
(Scope
(E
))
2184 or else (Present
(Renamed_Object
(E
))
2185 and then Is_Entity_Name
(Renamed_Object
(E
))
2188 (Scope
(Renamed_Object
(E
)))
2191 (Scope
(Renamed_Object
(E
))))))
2195 -- If the value of the constant is a local variable that renames
2196 -- an aggregate, this is in itself legal. The aggregate may be
2197 -- expanded into a loop, but this does not affect preelaborability
2198 -- in itself. If some aggregate components are non-static, that is
2199 -- to say if they involve non static primaries, they will be
2200 -- flagged when analyzed.
2203 and then Is_Entity_Name
(Val
)
2204 and then Is_Array_Type
(Etype
(Val
))
2205 and then not Comes_From_Source
(Val
)
2206 and then Nkind
(Original_Node
(Val
)) = N_Aggregate
2210 -- This is the error case
2213 -- In GNAT mode or Relaxed RM Semantic mode, this is just a
2214 -- warning, to allow it to be judiciously turned off.
2215 -- Otherwise it is a real error.
2217 if GNAT_Mode
or Relaxed_RM_Semantics
then
2219 ("??non-static constant in preelaborated unit", N
);
2221 Flag_Non_Static_Expr
2222 ("non-static constant in preelaborated unit", N
);
2227 end Validate_Static_Object_Name
;