1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, 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 (N : Node_Id) return Boolean;
90 -- Determines if a declaration is within the visible part of a Remote
91 -- Call Interface compilation unit, for semantic checking purposes only
92 -- (returns false within an instance and within the package body).
94 function In_RT_Declaration return Boolean;
95 -- Determines if current scope is within the declaration of a Remote Types
96 -- unit, for semantic checking purposes.
98 function In_Shared_Passive_Unit return Boolean;
99 -- Determines if current scope is within a Shared Passive compilation unit
101 function Static_Discriminant_Expr (L : List_Id) return Boolean;
102 -- Iterate through the list of discriminants to check if any of them
103 -- contains non-static default expression, which is a violation in
104 -- a preelaborated library unit.
106 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id);
107 -- Check validity of declaration if RCI or RT unit. It should not contain
108 -- the declaration of an access-to-object type unless it is a general
109 -- access type that designates a class-wide limited private type. There are
110 -- also constraints about the primitive subprograms of the class-wide type.
111 -- RM E.2 (9, 13, 14)
113 procedure Validate_RACW_Primitive
116 -- Check legality of the declaration of primitive Subp of the designated
117 -- type of the given RACW type.
119 ---------------------------------------
120 -- Check_Categorization_Dependencies --
121 ---------------------------------------
123 procedure Check_Categorization_Dependencies
124 (Unit_Entity : Entity_Id;
125 Depended_Entity : Entity_Id;
127 Is_Subunit : Boolean)
129 N : constant Node_Id := Info_Node;
132 -- Here we define an enumeration type to represent categorization types,
133 -- ordered so that a unit with a given categorization can only WITH
134 -- units with lower or equal categorization type.
136 type Categorization is
140 Remote_Call_Interface,
143 function Get_Categorization (E : Entity_Id) return Categorization;
144 -- Check categorization flags from entity, and return in the form
145 -- of the lowest value of the Categorization type that applies to E.
147 ------------------------
148 -- Get_Categorization --
149 ------------------------
151 function Get_Categorization (E : Entity_Id) return Categorization is
153 -- Get the lowest categorization that corresponds to E. Note that
154 -- nothing prevents several (different) categorization pragmas
155 -- to apply to the same library unit, in which case the unit has
156 -- all associated categories, so we need to be careful here to
157 -- check pragmas in proper Categorization order in order to
158 -- return the lowest applicable value.
160 -- Ignore Pure specification if set by pragma Pure_Function
164 (Has_Pragma_Pure_Function (E) and not Has_Pragma_Pure (E))
168 elsif Is_Shared_Passive (E) then
169 return Shared_Passive;
171 elsif Is_Remote_Types (E) then
174 elsif Is_Remote_Call_Interface (E) then
175 return Remote_Call_Interface;
180 end Get_Categorization;
182 Unit_Category : Categorization;
183 With_Category : Categorization;
185 -- Start of processing for Check_Categorization_Dependencies
188 -- Intrinsic subprograms are preelaborated, so do not impose any
189 -- categorization dependencies.
191 if Is_Intrinsic_Subprogram (Depended_Entity) then
195 -- First check 10.2.1 (11/1) rules on preelaborate packages
197 if Is_Preelaborated (Unit_Entity)
198 and then not Is_Preelaborated (Depended_Entity)
199 and then not Is_Pure (Depended_Entity)
206 -- Check categorization rules of RM E.2(5)
208 Unit_Category := Get_Categorization (Unit_Entity);
209 With_Category := Get_Categorization (Depended_Entity);
211 if With_Category > Unit_Category then
213 -- Special case: Remote_Types and Remote_Call_Interface are allowed
214 -- to WITH anything in the package body, per (RM E.2(5)).
216 if (Unit_Category = Remote_Types
217 or else Unit_Category = Remote_Call_Interface)
218 and then In_Package_Body (Unit_Entity)
222 -- Special case: Remote_Types can depend on Preelaborated per
225 elsif Unit_Category = Remote_Types
226 and then Is_Preelaborated (Depended_Entity)
230 -- All other cases, we do have an error
237 -- Here if we have an error
241 -- These messages are warnings in GNAT mode or if the -gnateP switch
242 -- was set. Otherwise these are real errors for real illegalities.
244 -- The reason we suppress these errors in GNAT mode is that the run-
245 -- time has several instances of violations of the categorization
246 -- errors (e.g. Pure units withing Preelaborate units. All these
247 -- violations are harmless in the cases where we intend them, and
248 -- we suppress the warnings with Warnings (Off). In cases where we
249 -- do not intend the violation, warnings are errors in GNAT mode
250 -- anyway, so we will still get an error.
253 Treat_Categorization_Errors_As_Warnings or GNAT_Mode;
255 -- Don't give error if main unit is not an internal unit, and the
256 -- unit generating the message is an internal unit. This is the
257 -- situation in which such messages would be ignored in any case,
258 -- so it is convenient not to generate them (since it causes
259 -- annoying interference with debugging).
261 if Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
262 and then not Is_Internal_File_Name (Unit_File_Name (Main_Unit))
268 elsif Is_Subunit then
270 ("<subunit cannot depend on& " &
271 "(parent has wrong categorization)", N, Depended_Entity);
273 -- Normal unit, not subunit
277 ("<cannot depend on& " &
278 "(wrong categorization)", N, Depended_Entity);
281 -- Add further explanation for Pure/Preelaborate common cases
283 if Unit_Category = Pure then
285 ("\<pure unit cannot depend on non-pure unit",
288 elsif Is_Preelaborated (Unit_Entity)
289 and then not Is_Preelaborated (Depended_Entity)
290 and then not Is_Pure (Depended_Entity)
293 ("\<preelaborated unit cannot depend on "
294 & "non-preelaborated unit",
298 end Check_Categorization_Dependencies;
300 -----------------------------------
301 -- Check_Non_Static_Default_Expr --
302 -----------------------------------
304 procedure Check_Non_Static_Default_Expr
309 Component_Decl : Node_Id;
312 if Nkind (Type_Def) = N_Derived_Type_Definition then
313 Recdef := Record_Extension_Part (Type_Def);
323 -- Check that component declarations do not involve:
325 -- a. a non-static default expression, where the object is
326 -- declared to be default initialized.
328 -- b. a dynamic Itype (discriminants and constraints)
330 if Null_Present (Recdef) then
333 Component_Decl := First (Component_Items (Component_List (Recdef)));
336 while Present (Component_Decl)
337 and then Nkind (Component_Decl) = N_Component_Declaration
339 if Present (Expression (Component_Decl))
340 and then Nkind (Expression (Component_Decl)) /= N_Null
341 and then not Is_Static_Expression (Expression (Component_Decl))
343 Error_Msg_Sloc := Sloc (Component_Decl);
345 ("object in preelaborated unit has non-static default#",
348 -- Fix this later ???
350 -- elsif Has_Dynamic_Itype (Component_Decl) then
352 -- ("dynamic type discriminant," &
353 -- " constraint in preelaborated unit",
357 Next (Component_Decl);
359 end Check_Non_Static_Default_Expr;
361 ---------------------------
362 -- Has_Non_Remote_Access --
363 ---------------------------
365 function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean is
366 Component : Entity_Id;
367 Comp_Type : Entity_Id;
368 U_Typ : constant Entity_Id := Underlying_Type (Typ);
374 elsif Has_Read_Write_Attributes (Typ)
375 or else Has_Read_Write_Attributes (U_Typ)
379 elsif Is_Non_Remote_Access_Type (U_Typ) then
383 if Is_Record_Type (U_Typ) then
384 Component := First_Entity (U_Typ);
385 while Present (Component) loop
386 if not Is_Tag (Component) then
387 Comp_Type := Etype (Component);
389 if Has_Non_Remote_Access (Comp_Type) then
394 Next_Entity (Component);
397 elsif Is_Array_Type (U_Typ) then
398 return Has_Non_Remote_Access (Component_Type (U_Typ));
403 end Has_Non_Remote_Access;
405 -------------------------------
406 -- Has_Read_Write_Attributes --
407 -------------------------------
409 function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is
412 and then Has_Stream_Attribute_Definition
413 (E, TSS_Stream_Read, At_Any_Place => True)
414 and then Has_Stream_Attribute_Definition
415 (E, TSS_Stream_Write, At_Any_Place => True);
416 end Has_Read_Write_Attributes;
418 -------------------------------------
419 -- Has_Stream_Attribute_Definition --
420 -------------------------------------
422 function Has_Stream_Attribute_Definition
425 At_Any_Place : Boolean := False) return Boolean
428 Full_Type : Entity_Id := Typ;
431 -- In the case of a type derived from a private view, any specified
432 -- stream attributes will be attached to the derived type's underlying
433 -- type rather the derived type entity itself (which is itself private).
435 if Is_Private_Type (Typ)
436 and then Is_Derived_Type (Typ)
437 and then Present (Full_View (Typ))
439 Full_Type := Underlying_Type (Typ);
442 -- We start from the declaration node and then loop until the end of
443 -- the list until we find the requested attribute definition clause.
444 -- In Ada 2005 mode, clauses are ignored if they are not currently
445 -- visible (this is tested using the corresponding Entity, which is
446 -- inserted by the expander at the point where the clause occurs),
447 -- unless At_Any_Place is true.
449 Rep_Item := First_Rep_Item (Full_Type);
450 while Present (Rep_Item) loop
451 if Nkind (Rep_Item) = N_Attribute_Definition_Clause then
452 case Chars (Rep_Item) is
454 exit when Nam = TSS_Stream_Read;
457 exit when Nam = TSS_Stream_Write;
460 exit when Nam = TSS_Stream_Input;
463 exit when Nam = TSS_Stream_Output;
471 Next_Rep_Item (Rep_Item);
474 -- If At_Any_Place is true, return True if the attribute is available
475 -- at any place; if it is false, return True only if the attribute is
476 -- currently visible.
478 return Present (Rep_Item)
479 and then (Ada_Version < Ada_2005
481 or else not Is_Hidden (Entity (Rep_Item)));
482 end Has_Stream_Attribute_Definition;
484 ---------------------------
485 -- In_Preelaborated_Unit --
486 ---------------------------
488 function In_Preelaborated_Unit return Boolean is
489 Unit_Entity : Entity_Id := Current_Scope;
490 Unit_Kind : constant Node_Kind :=
491 Nkind (Unit (Cunit (Current_Sem_Unit)));
494 -- If evaluating actuals for a child unit instantiation, then ignore
495 -- the preelaboration status of the parent; use the child instead.
497 if Is_Compilation_Unit (Unit_Entity)
498 and then Unit_Kind in N_Generic_Instantiation
499 and then not In_Same_Source_Unit (Unit_Entity,
500 Cunit (Current_Sem_Unit))
502 Unit_Entity := Cunit_Entity (Current_Sem_Unit);
505 -- There are no constraints on the body of Remote_Call_Interface or
506 -- Remote_Types packages.
508 return (Unit_Entity /= Standard_Standard)
509 and then (Is_Preelaborated (Unit_Entity)
510 or else Is_Pure (Unit_Entity)
511 or else Is_Shared_Passive (Unit_Entity)
513 ((Is_Remote_Types (Unit_Entity)
514 or else Is_Remote_Call_Interface (Unit_Entity))
515 and then Ekind (Unit_Entity) = E_Package
516 and then Unit_Kind /= N_Package_Body
517 and then not In_Package_Body (Unit_Entity)
518 and then not In_Instance));
519 end In_Preelaborated_Unit;
525 function In_Pure_Unit return Boolean is
527 return Is_Pure (Current_Scope);
530 ------------------------
531 -- In_RCI_Declaration --
532 ------------------------
534 function In_RCI_Declaration (N : Node_Id) return Boolean is
535 Unit_Entity : constant Entity_Id := Current_Scope;
536 Unit_Kind : constant Node_Kind :=
537 Nkind (Unit (Cunit (Current_Sem_Unit)));
540 -- There are no restrictions on the private part or body
543 return Is_Remote_Call_Interface (Unit_Entity)
544 and then Is_Package_Or_Generic_Package (Unit_Entity)
545 and then Unit_Kind /= N_Package_Body
546 and then List_Containing (N) =
548 (Specification (Unit_Declaration_Node (Unit_Entity)))
549 and then not In_Package_Body (Unit_Entity)
550 and then not In_Instance;
552 -- What about the case of a nested package in the visible part???
553 -- This case is missed by the List_Containing check above???
554 end In_RCI_Declaration;
556 -----------------------
557 -- In_RT_Declaration --
558 -----------------------
560 function In_RT_Declaration return Boolean is
561 Unit_Entity : constant Entity_Id := Current_Scope;
562 Unit_Kind : constant Node_Kind :=
563 Nkind (Unit (Cunit (Current_Sem_Unit)));
566 -- There are no restrictions on the body of a Remote Types unit
568 return Is_Remote_Types (Unit_Entity)
569 and then Is_Package_Or_Generic_Package (Unit_Entity)
570 and then Unit_Kind /= N_Package_Body
571 and then not In_Package_Body (Unit_Entity)
572 and then not In_Instance;
573 end In_RT_Declaration;
575 ----------------------------
576 -- In_Shared_Passive_Unit --
577 ----------------------------
579 function In_Shared_Passive_Unit return Boolean is
580 Unit_Entity : constant Entity_Id := Current_Scope;
583 return Is_Shared_Passive (Unit_Entity);
584 end In_Shared_Passive_Unit;
586 ---------------------------------------
587 -- In_Subprogram_Task_Protected_Unit --
588 ---------------------------------------
590 function In_Subprogram_Task_Protected_Unit return Boolean is
594 -- The following is to verify that a declaration is inside
595 -- subprogram, generic subprogram, task unit, protected unit.
596 -- Used to validate if a lib. unit is Pure. RM 10.2.1(16).
598 -- Use scope chain to check successively outer scopes
604 Is_Generic_Subprogram (E)
606 Is_Concurrent_Type (E)
610 elsif E = Standard_Standard then
616 end In_Subprogram_Task_Protected_Unit;
618 -------------------------------
619 -- Is_Non_Remote_Access_Type --
620 -------------------------------
622 function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean is
623 U_E : constant Entity_Id := Underlying_Type (E);
627 -- This case arises for the case of a generic formal type, in which
628 -- case E.2.2(8) rules will be enforced at instantiation time.
633 return Is_Access_Type (U_E)
634 and then not Is_Remote_Access_To_Class_Wide_Type (U_E)
635 and then not Is_Remote_Access_To_Subprogram_Type (U_E);
636 end Is_Non_Remote_Access_Type;
638 ---------------------------
639 -- No_External_Streaming --
640 ---------------------------
642 function No_External_Streaming (E : Entity_Id) return Boolean is
643 U_E : constant Entity_Id := Underlying_Type (E);
649 elsif Has_Read_Write_Attributes (E) then
651 -- Note: availability of stream attributes is tested on E, not U_E.
652 -- There may be stream attributes defined on U_E that are not visible
653 -- at the place where support of external streaming is tested.
657 elsif Has_Non_Remote_Access (U_E) then
661 return Is_Limited_Type (E);
662 end No_External_Streaming;
664 -------------------------------------
665 -- Set_Categorization_From_Pragmas --
666 -------------------------------------
668 procedure Set_Categorization_From_Pragmas (N : Node_Id) is
669 P : constant Node_Id := Parent (N);
670 S : constant Entity_Id := Current_Scope;
672 procedure Set_Parents (Visibility : Boolean);
673 -- If this is a child instance, the parents are not immediately
674 -- visible during analysis. Make them momentarily visible so that
675 -- the argument of the pragma can be resolved properly, and reset
682 procedure Set_Parents (Visibility : Boolean) is
686 while Present (Par) and then Par /= Standard_Standard loop
687 Set_Is_Immediately_Visible (Par, Visibility);
692 -- Start of processing for Set_Categorization_From_Pragmas
695 -- Deal with categorization pragmas in Pragmas of Compilation_Unit.
696 -- The purpose is to set categorization flags before analyzing the
697 -- unit itself, so as to diagnose violations of categorization as
698 -- we process each declaration, even though the pragma appears after
701 if Nkind (P) /= N_Compilation_Unit then
709 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then
713 PN := First (Pragmas_After (Aux_Decls_Node (P)));
714 while Present (PN) loop
716 -- Skip implicit types that may have been introduced by
717 -- previous analysis.
719 if Nkind (PN) = N_Pragma then
720 case Get_Pragma_Id (PN) is
721 when Pragma_All_Calls_Remote |
722 Pragma_Preelaborate |
724 Pragma_Remote_Call_Interface |
725 Pragma_Remote_Types |
726 Pragma_Shared_Passive => Analyze (PN);
734 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then
738 end Set_Categorization_From_Pragmas;
740 -----------------------------------
741 -- Set_Categorization_From_Scope --
742 -----------------------------------
744 procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id) is
745 Declaration : Node_Id := Empty;
746 Specification : Node_Id := Empty;
750 (E, Is_Pure (Scop) and then Is_Library_Level_Entity (E));
752 if not Is_Remote_Call_Interface (E) then
753 if Ekind (E) in Subprogram_Kind then
754 Declaration := Unit_Declaration_Node (E);
756 if Nkind_In (Declaration, N_Subprogram_Body,
757 N_Subprogram_Renaming_Declaration)
759 Specification := Corresponding_Spec (Declaration);
763 -- A subprogram body or renaming-as-body is a remote call interface
764 -- if it serves as the completion of a subprogram declaration that
765 -- is a remote call interface.
767 if Nkind (Specification) in N_Entity then
768 Set_Is_Remote_Call_Interface
769 (E, Is_Remote_Call_Interface (Specification));
771 -- A subprogram declaration is a remote call interface when it is
772 -- declared within the visible part of, or declared by, a library
773 -- unit declaration that is a remote call interface.
776 Set_Is_Remote_Call_Interface
777 (E, Is_Remote_Call_Interface (Scop)
778 and then not (In_Private_Part (Scop)
779 or else In_Package_Body (Scop)));
784 (E, Is_Remote_Types (Scop)
785 and then not (In_Private_Part (Scop)
786 or else In_Package_Body (Scop)));
787 end Set_Categorization_From_Scope;
789 ------------------------------
790 -- Static_Discriminant_Expr --
791 ------------------------------
793 -- We need to accommodate a Why_Not_Static call somehow here ???
795 function Static_Discriminant_Expr (L : List_Id) return Boolean is
796 Discriminant_Spec : Node_Id;
799 Discriminant_Spec := First (L);
800 while Present (Discriminant_Spec) loop
801 if Present (Expression (Discriminant_Spec))
802 and then not Is_Static_Expression (Expression (Discriminant_Spec))
807 Next (Discriminant_Spec);
811 end Static_Discriminant_Expr;
813 --------------------------------------
814 -- Validate_Access_Type_Declaration --
815 --------------------------------------
817 procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id) is
818 Def : constant Node_Id := Type_Definition (N);
823 -- Access to subprogram case
825 when N_Access_To_Subprogram_Definition =>
827 -- A pure library_item must not contain the declaration of a
828 -- named access type, except within a subprogram, generic
829 -- subprogram, task unit, or protected unit (RM 10.2.1(16)).
831 -- This test is skipped in Ada 2005 (see AI-366)
833 if Ada_Version < Ada_2005
834 and then Comes_From_Source (T)
835 and then In_Pure_Unit
836 and then not In_Subprogram_Task_Protected_Unit
838 Error_Msg_N ("named access type not allowed in pure unit", T);
841 -- Access to object case
843 when N_Access_To_Object_Definition =>
844 if Comes_From_Source (T)
845 and then In_Pure_Unit
846 and then not In_Subprogram_Task_Protected_Unit
848 -- We can't give the message yet, since the type is not frozen
849 -- and in Ada 2005 mode, access types are allowed in pure units
850 -- if the type has no storage pool (see AI-366). So we set a
851 -- flag which will be checked at freeze time.
853 Set_Is_Pure_Unit_Access_Type (T);
856 -- Check for RCI or RT unit type declaration: declaration of an
857 -- access-to-object type is illegal unless it is a general access
858 -- type that designates a class-wide limited private type.
859 -- Note that constraints on the primitive subprograms of the
860 -- designated tagged type are not enforced here but in
861 -- Validate_RACW_Primitives, which is done separately because the
862 -- designated type might not be frozen (and therefore its
863 -- primitive operations might not be completely known) at the
864 -- point of the RACW declaration.
866 Validate_Remote_Access_Object_Type_Declaration (T);
868 -- Check for shared passive unit type declaration. It should
869 -- not contain the declaration of access to class wide type,
870 -- access to task type and access to protected type with entry.
872 Validate_SP_Access_Object_Type_Decl (T);
878 -- Set categorization flag from package on entity as well, to allow
879 -- easy checks later on for required validations of RCI or RT units.
880 -- This is only done for entities that are in the original source.
882 if Comes_From_Source (T)
883 and then not (In_Package_Body (Scope (T))
884 or else In_Private_Part (Scope (T)))
886 Set_Is_Remote_Call_Interface
887 (T, Is_Remote_Call_Interface (Scope (T)));
889 (T, Is_Remote_Types (Scope (T)));
891 end Validate_Access_Type_Declaration;
893 ----------------------------
894 -- Validate_Ancestor_Part --
895 ----------------------------
897 procedure Validate_Ancestor_Part (N : Node_Id) is
898 A : constant Node_Id := Ancestor_Part (N);
899 T : constant Entity_Id := Entity (A);
902 if In_Preelaborated_Unit
903 and then not In_Subprogram_Or_Concurrent_Unit
904 and then (not Inside_A_Generic
905 or else Present (Enclosing_Generic_Body (N)))
907 -- If the type is private, it must have the Ada 2005 pragma
908 -- Has_Preelaborable_Initialization.
909 -- The check is omitted within predefined units. This is probably
910 -- obsolete code to fix the Ada 95 weakness in this area ???
912 if Is_Private_Type (T)
913 and then not Has_Pragma_Preelab_Init (T)
914 and then not Is_Internal_File_Name
915 (Unit_File_Name (Get_Source_Unit (N)))
918 ("private ancestor type not allowed in preelaborated unit", A);
920 elsif Is_Record_Type (T) then
921 if Nkind (Parent (T)) = N_Full_Type_Declaration then
922 Check_Non_Static_Default_Expr
923 (Type_Definition (Parent (T)), A);
927 end Validate_Ancestor_Part;
929 ----------------------------------------
930 -- Validate_Categorization_Dependency --
931 ----------------------------------------
933 procedure Validate_Categorization_Dependency
937 K : constant Node_Kind := Nkind (N);
938 P : Node_Id := Parent (N);
940 Is_Subunit : constant Boolean := Nkind (P) = N_Subunit;
943 -- Only validate library units and subunits. For subunits, checks
944 -- concerning withed units apply to the parent compilation unit.
951 and then not Is_Compilation_Unit (U)
952 and then not Is_Child_Unit (U)
958 if Nkind (P) /= N_Compilation_Unit then
962 -- Body of RCI unit does not need validation
964 if Is_Remote_Call_Interface (E)
965 and then Nkind_In (N, N_Package_Body, N_Subprogram_Body)
970 -- Ada 2005 (AI-50217): Process explicit non-limited with_clauses
974 Entity_Of_Withed : Entity_Id;
977 Item := First (Context_Items (P));
978 while Present (Item) loop
979 if Nkind (Item) = N_With_Clause
980 and then not (Implicit_With (Item)
981 or else Limited_Present (Item)
983 -- Skip if error already posted on the WITH
984 -- clause (in which case the Name attribute
985 -- may be invalid). In particular, this fixes
986 -- the problem of hanging in the presence of a
987 -- WITH clause on a child that is an illegal
988 -- generic instantiation.
990 or else Error_Posted (Item))
992 Entity_Of_Withed := Entity (Name (Item));
993 Check_Categorization_Dependencies
994 (U, Entity_Of_Withed, Item, Is_Subunit);
1001 -- Child depends on parent; therefore parent should also be categorized
1002 -- and satisfy the dependency hierarchy.
1004 -- Check if N is a child spec
1006 if (K in N_Generic_Declaration or else
1007 K in N_Generic_Instantiation or else
1008 K in N_Generic_Renaming_Declaration or else
1009 K = N_Package_Declaration or else
1010 K = N_Package_Renaming_Declaration or else
1011 K = N_Subprogram_Declaration or else
1012 K = N_Subprogram_Renaming_Declaration)
1013 and then Present (Parent_Spec (N))
1015 Check_Categorization_Dependencies (E, Scope (E), N, False);
1017 -- Verify that public child of an RCI library unit must also be an
1018 -- RCI library unit (RM E.2.3(15)).
1020 if Is_Remote_Call_Interface (Scope (E))
1021 and then not Private_Present (P)
1022 and then not Is_Remote_Call_Interface (E)
1024 Error_Msg_N ("public child of rci unit must also be rci unit", N);
1027 end Validate_Categorization_Dependency;
1029 --------------------------------
1030 -- Validate_Controlled_Object --
1031 --------------------------------
1033 procedure Validate_Controlled_Object (E : Entity_Id) is
1035 -- Don't need this check in Ada 2005 mode, where this is all taken
1036 -- care of by the mechanism for Preelaborable Initialization.
1038 if Ada_Version >= Ada_2005 then
1042 -- For now, never apply this check for internal GNAT units, since we
1043 -- have a number of cases in the library where we are stuck with objects
1044 -- of this type, and the RM requires Preelaborate.
1046 -- For similar reasons, we only do this check for source entities, since
1047 -- we generate entities of this type in some situations.
1049 -- Note that the 10.2.1(9) restrictions are not relevant to us anyway.
1050 -- We have to enforce them for RM compatibility, but we have no trouble
1051 -- accepting these objects and doing the right thing. Note that there is
1052 -- no requirement that Preelaborate not actually generate any code!
1054 if In_Preelaborated_Unit
1055 and then not Debug_Flag_PP
1056 and then Comes_From_Source (E)
1058 Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E)))
1059 and then (not Inside_A_Generic
1060 or else Present (Enclosing_Generic_Body (E)))
1061 and then not Is_Protected_Type (Etype (E))
1064 ("library level controlled object not allowed in " &
1065 "preelaborated unit", E);
1067 end Validate_Controlled_Object;
1069 --------------------------------------
1070 -- Validate_Null_Statement_Sequence --
1071 --------------------------------------
1073 procedure Validate_Null_Statement_Sequence (N : Node_Id) is
1077 if In_Preelaborated_Unit then
1078 Item := First (Statements (Handled_Statement_Sequence (N)));
1079 while Present (Item) loop
1080 if Nkind (Item) /= N_Label
1081 and then Nkind (Item) /= N_Null_Statement
1083 -- In GNAT mode, this is a warning, allowing the run-time
1084 -- to judiciously bypass this error condition.
1086 Error_Msg_Warn := GNAT_Mode;
1088 ("<statements not allowed in preelaborated unit", Item);
1096 end Validate_Null_Statement_Sequence;
1098 ---------------------------------
1099 -- Validate_Object_Declaration --
1100 ---------------------------------
1102 procedure Validate_Object_Declaration (N : Node_Id) is
1103 Id : constant Entity_Id := Defining_Identifier (N);
1104 E : constant Node_Id := Expression (N);
1105 Odf : constant Node_Id := Object_Definition (N);
1106 T : constant Entity_Id := Etype (Id);
1109 -- Verify that any access to subprogram object does not have in its
1110 -- subprogram profile access type parameters or limited parameters
1111 -- without Read and Write attributes (E.2.3(13)).
1113 Validate_RCI_Subprogram_Declaration (N);
1115 -- Check that if we are in preelaborated elaboration code, then we
1116 -- do not have an instance of a default initialized private, task or
1117 -- protected object declaration which would violate (RM 10.2.1(9)).
1118 -- Note that constants are never default initialized (and the test
1119 -- below also filters out deferred constants). A variable is default
1120 -- initialized if it does *not* have an initialization expression.
1122 -- Filter out cases that are not declaration of a variable from source
1124 if Nkind (N) /= N_Object_Declaration
1125 or else Constant_Present (N)
1126 or else not Comes_From_Source (Id)
1131 -- Exclude generic specs from the checks (this will get rechecked
1132 -- on instantiations).
1134 if Inside_A_Generic and then No (Enclosing_Generic_Body (Id)) then
1138 -- Required checks for declaration that is in a preelaborated package
1139 -- and is not within some subprogram.
1141 if In_Preelaborated_Unit
1142 and then not In_Subprogram_Or_Concurrent_Unit
1144 -- Check for default initialized variable case. Note that in
1145 -- accordance with (RM B.1(24)) imported objects are not subject to
1146 -- default initialization.
1147 -- If the initialization does not come from source and is an
1148 -- aggregate, it is a static initialization that replaces an
1149 -- implicit call, and must be treated as such.
1152 and then (Comes_From_Source (E) or else Nkind (E) /= N_Aggregate)
1156 elsif Is_Imported (Id) then
1161 Ent : Entity_Id := T;
1164 -- An array whose component type is a record with nonstatic
1165 -- default expressions is a violation, so we get the array's
1168 if Is_Array_Type (Ent) then
1170 Comp_Type : Entity_Id;
1173 Comp_Type := Component_Type (Ent);
1174 while Is_Array_Type (Comp_Type) loop
1175 Comp_Type := Component_Type (Comp_Type);
1182 -- Object decl. that is of record type and has no default expr.
1183 -- should check if there is any non-static default expression
1184 -- in component decl. of the record type decl.
1186 if Is_Record_Type (Ent) then
1187 if Nkind (Parent (Ent)) = N_Full_Type_Declaration then
1188 Check_Non_Static_Default_Expr
1189 (Type_Definition (Parent (Ent)), N);
1191 elsif Nkind (Odf) = N_Subtype_Indication
1192 and then not Is_Array_Type (T)
1193 and then not Is_Private_Type (T)
1195 Check_Non_Static_Default_Expr (Type_Definition
1196 (Parent (Entity (Subtype_Mark (Odf)))), N);
1200 -- Check for invalid use of private object. Note that Ada 2005
1201 -- AI-161 modifies the rules for Ada 2005, including the use of
1202 -- the new pragma Preelaborable_Initialization.
1204 if Is_Private_Type (Ent)
1205 or else Depends_On_Private (Ent)
1207 -- Case where type has preelaborable initialization which
1208 -- means that a pragma Preelaborable_Initialization was
1209 -- given for the private type.
1211 if Has_Preelaborable_Initialization (Ent) then
1213 -- But for the predefined units, we will ignore this
1214 -- status unless we are in Ada 2005 mode since we want
1215 -- Ada 95 compatible behavior, in which the entities
1216 -- marked with this pragma in the predefined library are
1217 -- not treated specially.
1219 if Ada_Version < Ada_2005 then
1221 ("private object not allowed in preelaborated unit",
1223 Error_Msg_N ("\(would be legal in Ada 2005 mode)", N);
1226 -- Type does not have preelaborable initialization
1229 -- We allow this when compiling in GNAT mode to make life
1230 -- easier for some cases where it would otherwise be hard
1231 -- to be exactly valid Ada.
1233 if not GNAT_Mode then
1235 ("private object not allowed in preelaborated unit",
1238 -- Add a message if it would help to provide a pragma
1239 -- Preelaborable_Initialization on the type of the
1240 -- object (which would make it legal in Ada 2005).
1242 -- If the type has no full view (generic type, or
1243 -- previous error), the warning does not apply.
1245 if Is_Private_Type (Ent)
1246 and then Present (Full_View (Ent))
1248 Has_Preelaborable_Initialization (Full_View (Ent))
1250 Error_Msg_Sloc := Sloc (Ent);
1252 if Ada_Version >= Ada_2005 then
1254 ("\would be legal if pragma Preelaborable_" &
1255 "Initialization given for & #", N, Ent);
1258 ("\would be legal in Ada 2005 if pragma " &
1259 "Preelaborable_Initialization given for & #",
1266 -- Access to Task or Protected type
1268 elsif Is_Entity_Name (Odf)
1269 and then Present (Etype (Odf))
1270 and then Is_Access_Type (Etype (Odf))
1272 Ent := Designated_Type (Etype (Odf));
1274 elsif Is_Entity_Name (Odf) then
1275 Ent := Entity (Odf);
1277 elsif Nkind (Odf) = N_Subtype_Indication then
1278 Ent := Etype (Subtype_Mark (Odf));
1280 elsif Nkind (Odf) = N_Constrained_Array_Definition then
1281 Ent := Component_Type (T);
1284 if Is_Task_Type (Ent)
1285 or else (Is_Protected_Type (Ent) and then Has_Entries (Ent))
1288 ("concurrent object not allowed in preelaborated unit",
1295 -- Non-static discriminants not allowed in preelaborated unit.
1296 -- Objects of a controlled type with a user-defined Initialize
1297 -- are forbidden as well.
1299 if Is_Record_Type (Etype (Id)) then
1301 ET : constant Entity_Id := Etype (Id);
1302 EE : constant Entity_Id := Etype (Etype (Id));
1306 if Has_Discriminants (ET) and then Present (EE) then
1309 if Nkind (PEE) = N_Full_Type_Declaration
1310 and then not Static_Discriminant_Expr
1311 (Discriminant_Specifications (PEE))
1314 ("non-static discriminant in preelaborated unit",
1319 -- For controlled type or type with controlled component, check
1320 -- preelaboration flag, as there may be a non-null Initialize
1321 -- primitive. For language versions earlier than Ada 2005,
1322 -- there is no notion of preelaborable initialization, and
1323 -- Validate_Controlled_Object is used to enforce rules for
1324 -- controlled objects.
1326 if (Is_Controlled (ET) or else Has_Controlled_Component (ET))
1327 and then Ada_Version >= Ada_2005
1328 and then not Has_Preelaborable_Initialization (ET)
1331 ("controlled type& does not have"
1332 & " preelaborable initialization", N, ET);
1339 -- A pure library_item must not contain the declaration of any variable
1340 -- except within a subprogram, generic subprogram, task unit, or
1341 -- protected unit (RM 10.2.1(16)).
1343 if In_Pure_Unit and then not In_Subprogram_Task_Protected_Unit then
1344 Error_Msg_N ("declaration of variable not allowed in pure unit", N);
1346 -- The visible part of an RCI library unit must not contain the
1347 -- declaration of a variable (RM E.1.3(9))
1349 elsif In_RCI_Declaration (N) then
1350 Error_Msg_N ("visible variable not allowed in 'R'C'I unit", N);
1352 -- The visible part of a Shared Passive library unit must not contain
1353 -- the declaration of a variable (RM E.2.2(7))
1355 elsif In_RT_Declaration and then not In_Private_Part (Id) then
1357 ("visible variable not allowed in remote types unit", N);
1360 end Validate_Object_Declaration;
1362 -----------------------------
1363 -- Validate_RACW_Primitive --
1364 -----------------------------
1366 procedure Validate_RACW_Primitive
1370 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id);
1371 -- Diagnose illegality on N. If RACW is present, report the error on it
1372 -- rather than on N.
1374 -------------------------
1375 -- Illegal_Remote_Subp --
1376 -------------------------
1378 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id) is
1380 if Present (RACW) then
1381 if not Error_Posted (RACW) then
1383 ("illegal remote access to class-wide type&", RACW);
1386 Error_Msg_Sloc := Sloc (N);
1387 Error_Msg_NE ("\\" & Msg & " in primitive& #", RACW, Subp);
1390 Error_Msg_NE (Msg & " in remote subprogram&", N, Subp);
1392 end Illegal_Remote_Subp;
1396 Param_Spec : Node_Id;
1397 Param_Type : Entity_Id;
1399 -- Start of processing for Validate_RACW_Primitive
1402 -- Check return type
1404 if Ekind (Subp) = E_Function then
1405 Rtyp := Etype (Subp);
1407 -- AI05-0101 (Binding Interpretation): The result type of a remote
1408 -- function must either support external streaming or be a
1409 -- controlling access result type.
1411 if Has_Controlling_Result (Subp) then
1414 elsif Ekind (Rtyp) = E_Anonymous_Access_Type then
1415 Illegal_Remote_Subp ("anonymous access result", Rtyp);
1417 elsif Is_Limited_Type (Rtyp) then
1418 if No (TSS (Rtyp, TSS_Stream_Read))
1420 No (TSS (Rtyp, TSS_Stream_Write))
1423 ("limited return type must have Read and Write attributes",
1425 Explain_Limited_Type (Rtyp, Parent (Subp));
1428 -- Check that the return type supports external streaming
1430 elsif No_External_Streaming (Rtyp)
1431 and then not Error_Posted (Rtyp)
1433 Illegal_Remote_Subp ("return type containing non-remote access "
1434 & "must have Read and Write attributes",
1439 Param := First_Formal (Subp);
1440 while Present (Param) loop
1442 -- Now find out if this parameter is a controlling parameter
1444 Param_Spec := Parent (Param);
1445 Param_Type := Etype (Param);
1447 if Is_Controlling_Formal (Param) then
1449 -- It is a controlling parameter, so specific checks below do not
1454 elsif Ekind_In (Param_Type, E_Anonymous_Access_Type,
1455 E_Anonymous_Access_Subprogram_Type)
1457 -- From RM E.2.2(14), no anonymous access parameter other than
1458 -- controlling ones may be used (because an anonymous access
1459 -- type never supports external streaming).
1462 ("non-controlling access parameter", Param_Spec);
1464 elsif No_External_Streaming (Param_Type)
1465 and then not Error_Posted (Param_Type)
1467 Illegal_Remote_Subp ("formal parameter in remote subprogram must "
1468 & "support external streaming", Param_Spec);
1471 -- Check next parameter in this subprogram
1473 Next_Formal (Param);
1475 end Validate_RACW_Primitive;
1477 ------------------------------
1478 -- Validate_RACW_Primitives --
1479 ------------------------------
1481 procedure Validate_RACW_Primitives (T : Entity_Id) is
1482 Desig_Type : Entity_Id;
1483 Primitive_Subprograms : Elist_Id;
1484 Subprogram_Elmt : Elmt_Id;
1485 Subprogram : Entity_Id;
1488 Desig_Type := Etype (Designated_Type (T));
1490 -- No action needed for concurrent types
1492 if Is_Concurrent_Type (Desig_Type) then
1496 Primitive_Subprograms := Primitive_Operations (Desig_Type);
1498 Subprogram_Elmt := First_Elmt (Primitive_Subprograms);
1499 while Subprogram_Elmt /= No_Elmt loop
1500 Subprogram := Node (Subprogram_Elmt);
1502 if Is_Predefined_Dispatching_Operation (Subprogram)
1503 or else Is_Hidden (Subprogram)
1505 goto Next_Subprogram;
1508 Validate_RACW_Primitive (Subp => Subprogram, RACW => T);
1511 Next_Elmt (Subprogram_Elmt);
1513 end Validate_RACW_Primitives;
1515 -------------------------------
1516 -- Validate_RCI_Declarations --
1517 -------------------------------
1519 procedure Validate_RCI_Declarations (P : Entity_Id) is
1523 E := First_Entity (P);
1524 while Present (E) loop
1525 if Comes_From_Source (E) then
1526 if Is_Limited_Type (E) then
1528 ("limited type not allowed in rci unit", Parent (E));
1529 Explain_Limited_Type (E, Parent (E));
1531 elsif Ekind_In (E, E_Generic_Function,
1533 E_Generic_Procedure)
1535 Error_Msg_N ("generic declaration not allowed in rci unit",
1538 elsif (Ekind (E) = E_Function or else Ekind (E) = E_Procedure)
1539 and then Has_Pragma_Inline (E)
1542 ("inlined subprogram not allowed in rci unit", Parent (E));
1544 -- Inner packages that are renamings need not be checked. Generic
1545 -- RCI packages are subject to the checks, but entities that come
1546 -- from formal packages are not part of the visible declarations
1547 -- of the package and are not checked.
1549 elsif Ekind (E) = E_Package then
1550 if Present (Renamed_Entity (E)) then
1553 elsif Ekind (P) /= E_Generic_Package
1554 or else List_Containing (Unit_Declaration_Node (E)) /=
1555 Generic_Formal_Declarations
1556 (Unit_Declaration_Node (P))
1558 Validate_RCI_Declarations (E);
1565 end Validate_RCI_Declarations;
1567 -----------------------------------------
1568 -- Validate_RCI_Subprogram_Declaration --
1569 -----------------------------------------
1571 procedure Validate_RCI_Subprogram_Declaration (N : Node_Id) is
1572 K : constant Node_Kind := Nkind (N);
1575 Param_Spec : Node_Id;
1576 Param_Type : Entity_Id;
1577 Error_Node : Node_Id := N;
1580 -- This procedure enforces rules on subprogram and access to subprogram
1581 -- declarations in RCI units. These rules do not apply to expander
1582 -- generated routines, which are not remote subprograms. It is called:
1584 -- 1. from Analyze_Subprogram_Declaration.
1585 -- 2. from Validate_Object_Declaration (access to subprogram).
1587 if not (Comes_From_Source (N) and then In_RCI_Declaration (N)) then
1591 if K = N_Subprogram_Declaration then
1592 Id := Defining_Unit_Name (Specification (N));
1593 Profile := Parameter_Specifications (Specification (N));
1595 else pragma Assert (K = N_Object_Declaration);
1597 -- The above assertion is dubious, the visible declarations of an
1598 -- RCI unit never contain an object declaration, this should be an
1599 -- ACCESS-to-object declaration???
1601 Id := Defining_Identifier (N);
1603 if Nkind (Id) = N_Defining_Identifier
1604 and then Nkind (Parent (Etype (Id))) = N_Full_Type_Declaration
1605 and then Ekind (Etype (Id)) = E_Access_Subprogram_Type
1608 Parameter_Specifications (Type_Definition (Parent (Etype (Id))));
1614 -- Iterate through the parameter specification list, checking that
1615 -- no access parameter and no limited type parameter in the list.
1618 if Present (Profile) then
1619 Param_Spec := First (Profile);
1620 while Present (Param_Spec) loop
1621 Param_Type := Etype (Defining_Identifier (Param_Spec));
1623 if Ekind (Param_Type) = E_Anonymous_Access_Type then
1624 if K = N_Subprogram_Declaration then
1625 Error_Node := Param_Spec;
1628 -- Report error only if declaration is in source program
1630 if Comes_From_Source
1631 (Defining_Entity (Specification (N)))
1634 ("subprogram in 'R'C'I unit cannot have access parameter",
1638 -- For a limited private type parameter, we check only the private
1639 -- declaration and ignore full type declaration, unless this is
1640 -- the only declaration for the type, e.g., as a limited record.
1642 elsif No_External_Streaming (Param_Type) then
1643 if K = N_Subprogram_Declaration then
1644 Error_Node := Param_Spec;
1648 ("formal of remote subprogram& "
1649 & "must support external streaming",
1651 if Is_Limited_Type (Param_Type) then
1652 Explain_Limited_Type (Param_Type, Error_Node);
1659 -- No check on return type???
1661 end Validate_RCI_Subprogram_Declaration;
1663 ----------------------------------------------------
1664 -- Validate_Remote_Access_Object_Type_Declaration --
1665 ----------------------------------------------------
1667 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id) is
1668 Direct_Designated_Type : Entity_Id;
1669 Desig_Type : Entity_Id;
1672 -- We are called from Analyze_Full_Type_Declaration, and the Nkind of
1673 -- the given node is N_Access_To_Object_Definition.
1675 if not Comes_From_Source (T)
1676 or else (not In_RCI_Declaration (Parent (T))
1677 and then not In_RT_Declaration)
1682 -- An access definition in the private part of a Remote Types package
1683 -- may be legal if it has user-defined Read and Write attributes. This
1684 -- will be checked at the end of the package spec processing.
1686 if In_RT_Declaration and then In_Private_Part (Scope (T)) then
1690 -- Check RCI or RT unit type declaration. It may not contain the
1691 -- declaration of an access-to-object type unless it is a general access
1692 -- type that designates a class-wide limited private type or subtype.
1693 -- There are also constraints on the primitive subprograms of the
1694 -- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives).
1696 if Ekind (T) /= E_General_Access_Type
1697 or else not Is_Class_Wide_Type (Designated_Type (T))
1699 if In_RCI_Declaration (Parent (T)) then
1701 ("error in access type in Remote_Call_Interface unit", T);
1704 ("error in access type in Remote_Types unit", T);
1707 Error_Msg_N ("\must be general access to class-wide type", T);
1711 Direct_Designated_Type := Designated_Type (T);
1712 Desig_Type := Etype (Direct_Designated_Type);
1714 -- Why is the check below not in
1715 -- Validate_Remote_Access_To_Class_Wide_Type???
1717 if not Is_Valid_Remote_Object_Type (Desig_Type) then
1719 ("error in designated type of remote access to class-wide type", T);
1721 ("\must be tagged limited private or private extension", T);
1724 end Validate_Remote_Access_Object_Type_Declaration;
1726 -----------------------------------------------
1727 -- Validate_Remote_Access_To_Class_Wide_Type --
1728 -----------------------------------------------
1730 procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id) is
1731 K : constant Node_Kind := Nkind (N);
1732 PK : constant Node_Kind := Nkind (Parent (N));
1736 -- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses
1737 -- of class-wide limited private types.
1739 -- Storage_Pool and Storage_Size are not defined for such types
1741 -- The expected type of allocator must not be such a type.
1743 -- The actual parameter of generic instantiation must not be such a
1744 -- type if the formal parameter is of an access type.
1746 -- On entry, there are several cases:
1748 -- 1. called from sem_attr Analyze_Attribute where attribute name is
1749 -- either Storage_Pool or Storage_Size.
1751 -- 2. called from exp_ch4 Expand_N_Allocator
1753 -- 3. called from sem_ch4 Analyze_Explicit_Dereference
1755 -- 4. called from sem_res Resolve_Actuals
1757 if K = N_Attribute_Reference then
1758 E := Etype (Prefix (N));
1760 if Is_Remote_Access_To_Class_Wide_Type (E) then
1761 Error_Msg_N ("incorrect attribute of remote operand", N);
1765 elsif K = N_Allocator then
1768 if Is_Remote_Access_To_Class_Wide_Type (E) then
1769 Error_Msg_N ("incorrect expected remote type of allocator", N);
1773 -- This subprogram also enforces the checks in E.2.2(13). A value of
1774 -- such type must not be dereferenced unless as controlling operand of
1775 -- a dispatching call. Explicit dereferences not coming from source are
1776 -- exempted from this checking because the expander produces them in
1777 -- some cases (such as for tag checks on dispatching calls with multiple
1778 -- controlling operands). However we do check in the case of an implicit
1779 -- dereference that is expanded to an explicit dereference (hence the
1780 -- test of whether Original_Node (N) comes from source).
1782 elsif K = N_Explicit_Dereference
1783 and then Comes_From_Source (Original_Node (N))
1785 E := Etype (Prefix (N));
1787 -- If the class-wide type is not a remote one, the restrictions
1790 if not Is_Remote_Access_To_Class_Wide_Type (E) then
1794 -- If we have a true dereference that comes from source and that
1795 -- is a controlling argument for a dispatching call, accept it.
1797 if Is_Actual_Parameter (N) and then Is_Controlling_Actual (N) then
1801 -- If we are just within a procedure or function call and the
1802 -- dereference has not been analyzed, return because this procedure
1803 -- will be called again from sem_res Resolve_Actuals. The same can
1804 -- apply in the case of dereference that is the prefix of a selected
1805 -- component, which can be a call given in prefixed form.
1807 if (Is_Actual_Parameter (N) or else PK = N_Selected_Component)
1808 and then not Analyzed (N)
1813 -- We must allow expanded code to generate a reference to the tag of
1814 -- the designated object (may be either the actual tag, or the stub
1815 -- tag in the case of a remote object).
1817 if PK = N_Selected_Component
1818 and then Is_Tag (Entity (Selector_Name (Parent (N))))
1824 ("invalid dereference of a remote access-to-class-wide value", N);
1826 end Validate_Remote_Access_To_Class_Wide_Type;
1828 ------------------------------------------
1829 -- Validate_Remote_Type_Type_Conversion --
1830 ------------------------------------------
1832 procedure Validate_Remote_Type_Type_Conversion (N : Node_Id) is
1833 S : constant Entity_Id := Etype (N);
1834 E : constant Entity_Id := Etype (Expression (N));
1837 -- This test is required in the case where a conversion appears inside a
1838 -- normal package, it does not necessarily have to be inside an RCI,
1839 -- Remote_Types unit (RM E.2.2(9,12)).
1841 if Is_Remote_Access_To_Subprogram_Type (E)
1842 and then not Is_Remote_Access_To_Subprogram_Type (S)
1845 ("incorrect conversion of remote operand to local type", N);
1848 elsif not Is_Remote_Access_To_Subprogram_Type (E)
1849 and then Is_Remote_Access_To_Subprogram_Type (S)
1852 ("incorrect conversion of local operand to remote type", N);
1855 elsif Is_Remote_Access_To_Class_Wide_Type (E)
1856 and then not Is_Remote_Access_To_Class_Wide_Type (S)
1859 ("incorrect conversion of remote operand to local type", N);
1863 -- If a local access type is converted into a RACW type, then the
1864 -- current unit has a pointer that may now be exported to another
1867 if Is_Remote_Access_To_Class_Wide_Type (S)
1868 and then not Is_Remote_Access_To_Class_Wide_Type (E)
1870 Set_Has_RACW (Current_Sem_Unit);
1872 end Validate_Remote_Type_Type_Conversion;
1874 -------------------------------
1875 -- Validate_RT_RAT_Component --
1876 -------------------------------
1878 procedure Validate_RT_RAT_Component (N : Node_Id) is
1879 Spec : constant Node_Id := Specification (N);
1880 Name_U : constant Entity_Id := Defining_Entity (Spec);
1883 First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U);
1885 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean;
1886 -- True if any stream attribute is available for Typ
1888 ---------------------------------
1889 -- Stream_Attributes_Available --
1890 ---------------------------------
1892 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean
1895 return Stream_Attribute_Available (Typ, TSS_Stream_Read)
1897 Stream_Attribute_Available (Typ, TSS_Stream_Write)
1899 Stream_Attribute_Available (Typ, TSS_Stream_Input)
1901 Stream_Attribute_Available (Typ, TSS_Stream_Output);
1902 end Stream_Attributes_Available;
1904 -- Start of processing for Validate_RT_RAT_Component
1907 if not Is_Remote_Types (Name_U) then
1911 Typ := First_Entity (Name_U);
1912 while Present (Typ) and then Typ /= First_Priv_Ent loop
1913 U_Typ := Underlying_Type (Typ);
1919 if Comes_From_Source (Typ) and then Is_Type (Typ) then
1921 -- Check that the type can be meaningfully transmitted to another
1922 -- partition (E.2.2(8)).
1924 if (Ada_Version < Ada_2005 and then Has_Non_Remote_Access (U_Typ))
1925 or else (Stream_Attributes_Available (Typ)
1926 and then No_External_Streaming (U_Typ))
1928 if Is_Non_Remote_Access_Type (Typ) then
1929 Error_Msg_N ("error in non-remote access type", U_Typ);
1932 ("error in record type containing a component of a " &
1933 "non-remote access type", U_Typ);
1936 if Ada_Version >= Ada_2005 then
1938 ("\must have visible Read and Write attribute " &
1939 "definition clauses (RM E.2.2(8))", U_Typ);
1942 ("\must have Read and Write attribute " &
1943 "definition clauses (RM E.2.2(8))", U_Typ);
1950 end Validate_RT_RAT_Component;
1952 -----------------------------------------
1953 -- Validate_SP_Access_Object_Type_Decl --
1954 -----------------------------------------
1956 procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id) is
1957 Direct_Designated_Type : Entity_Id;
1959 function Has_Entry_Declarations (E : Entity_Id) return Boolean;
1960 -- Return true if the protected type designated by T has entry
1963 ----------------------------
1964 -- Has_Entry_Declarations --
1965 ----------------------------
1967 function Has_Entry_Declarations (E : Entity_Id) return Boolean is
1971 if Nkind (Parent (E)) = N_Protected_Type_Declaration then
1972 Ety := First_Entity (E);
1973 while Present (Ety) loop
1974 if Ekind (Ety) = E_Entry then
1983 end Has_Entry_Declarations;
1985 -- Start of processing for Validate_SP_Access_Object_Type_Decl
1988 -- We are called from Sem_Ch3.Analyze_Full_Type_Declaration, and the
1989 -- Nkind of the given entity is N_Access_To_Object_Definition.
1991 if not Comes_From_Source (T)
1992 or else not In_Shared_Passive_Unit
1993 or else In_Subprogram_Task_Protected_Unit
1998 -- Check Shared Passive unit. It should not contain the declaration
1999 -- of an access-to-object type whose designated type is a class-wide
2000 -- type, task type or protected type with entry (RM E.2.1(7)).
2002 Direct_Designated_Type := Designated_Type (T);
2004 if Ekind (Direct_Designated_Type) = E_Class_Wide_Type then
2006 ("invalid access-to-class-wide type in shared passive unit", T);
2009 elsif Ekind (Direct_Designated_Type) in Task_Kind then
2011 ("invalid access-to-task type in shared passive unit", T);
2014 elsif Ekind (Direct_Designated_Type) in Protected_Kind
2015 and then Has_Entry_Declarations (Direct_Designated_Type)
2018 ("invalid access-to-protected type in shared passive unit", T);
2021 end Validate_SP_Access_Object_Type_Decl;
2023 ---------------------------------
2024 -- Validate_Static_Object_Name --
2025 ---------------------------------
2027 procedure Validate_Static_Object_Name (N : Node_Id) is
2030 function Is_Primary (N : Node_Id) return Boolean;
2031 -- Determine whether node is syntactically a primary in an expression
2032 -- This function should probably be somewhere else ???
2033 -- Also it does not do what it says, e.g if N is a binary operator
2034 -- whose parent is a binary operator, Is_Primary returns True ???
2040 function Is_Primary (N : Node_Id) return Boolean is
2041 K : constant Node_Kind := Nkind (Parent (N));
2045 when N_Op | N_Membership_Test =>
2049 | N_Component_Association
2050 | N_Index_Or_Discriminant_Constraint =>
2053 when N_Attribute_Reference =>
2054 return Attribute_Name (Parent (N)) /= Name_Address
2055 and then Attribute_Name (Parent (N)) /= Name_Access
2056 and then Attribute_Name (Parent (N)) /= Name_Unchecked_Access
2058 Attribute_Name (Parent (N)) /= Name_Unrestricted_Access;
2060 when N_Indexed_Component =>
2061 return (N /= Prefix (Parent (N))
2062 or else Is_Primary (Parent (N)));
2064 when N_Qualified_Expression | N_Type_Conversion =>
2065 return Is_Primary (Parent (N));
2067 when N_Assignment_Statement | N_Object_Declaration =>
2068 return (N = Expression (Parent (N)));
2070 when N_Selected_Component =>
2071 return Is_Primary (Parent (N));
2078 -- Start of processing for Validate_Static_Object_Name
2081 if not In_Preelaborated_Unit
2082 or else not Comes_From_Source (N)
2083 or else In_Subprogram_Or_Concurrent_Unit
2084 or else Ekind (Current_Scope) = E_Block
2088 -- Filter out cases where primary is default in a component declaration,
2089 -- discriminant specification, or actual in a record type initialization
2092 -- Initialization call of internal types
2094 elsif Nkind (Parent (N)) = N_Procedure_Call_Statement then
2096 if Present (Parent (Parent (N)))
2097 and then Nkind (Parent (Parent (N))) = N_Freeze_Entity
2102 if Nkind (Name (Parent (N))) = N_Identifier
2103 and then not Comes_From_Source (Entity (Name (Parent (N))))
2109 -- Error if the name is a primary in an expression. The parent must not
2110 -- be an operator, or a selected component or an indexed component that
2111 -- is itself a primary. Entities that are actuals do not need to be
2112 -- checked, because the call itself will be diagnosed.
2115 and then (not Inside_A_Generic
2116 or else Present (Enclosing_Generic_Body (N)))
2118 if Ekind (Entity (N)) = E_Variable
2119 or else Ekind (Entity (N)) in Formal_Object_Kind
2121 Flag_Non_Static_Expr
2122 ("non-static object name in preelaborated unit", N);
2124 -- Give an error for a reference to a nonstatic constant, unless the
2125 -- constant is in another GNAT library unit that is preelaborable.
2127 elsif Ekind (Entity (N)) = E_Constant
2128 and then not Is_Static_Expression (N)
2132 if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N)))
2134 Enclosing_Lib_Unit_Node (N) /= Enclosing_Lib_Unit_Node (E)
2135 and then (Is_Preelaborated (Scope (E))
2136 or else Is_Pure (Scope (E))
2137 or else (Present (Renamed_Object (E))
2138 and then Is_Entity_Name (Renamed_Object (E))
2141 (Scope (Renamed_Object (E)))
2144 (Renamed_Object (E))))))
2148 -- This is the error case
2151 -- In GNAT mode, this is just a warning, to allow it to be
2152 -- judiciously turned off. Otherwise it is a real error.
2156 ("?non-static constant in preelaborated unit", N);
2158 Flag_Non_Static_Expr
2159 ("non-static constant in preelaborated unit", N);
2164 end Validate_Static_Object_Name;