1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2003, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Casing; use Casing;
29 with Checks; use Checks;
30 with Debug; use Debug;
31 with Errout; use Errout;
32 with Elists; use Elists;
33 with Exp_Tss; use Exp_Tss;
34 with Exp_Util; use Exp_Util;
35 with Fname; use Fname;
36 with Freeze; use Freeze;
38 with Lib.Xref; use Lib.Xref;
39 with Namet; use Namet;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
42 with Output; use Output;
44 with Restrict; use Restrict;
45 with Scans; use Scans;
48 with Sem_Ch8; use Sem_Ch8;
49 with Sem_Eval; use Sem_Eval;
50 with Sem_Res; use Sem_Res;
51 with Sem_Type; use Sem_Type;
52 with Sinfo; use Sinfo;
53 with Sinput; use Sinput;
54 with Snames; use Snames;
55 with Stand; use Stand;
57 with Stringt; use Stringt;
58 with Targparm; use Targparm;
59 with Tbuild; use Tbuild;
60 with Ttypes; use Ttypes;
62 package body Sem_Util is
64 -----------------------
65 -- Local Subprograms --
66 -----------------------
68 function Build_Component_Subtype
71 T : Entity_Id) return Node_Id;
72 -- This function builds the subtype for Build_Actual_Subtype_Of_Component
73 -- and Build_Discriminal_Subtype_Of_Component. C is a list of constraints,
74 -- Loc is the source location, T is the original subtype.
76 function Is_Fully_Initialized_Variant (Typ : Entity_Id) return Boolean;
77 -- Subsidiary to Is_Fully_Initialized_Type. For an unconstrained type
78 -- with discriminants whose default values are static, examine only the
79 -- components in the selected variant to determine whether all of them
82 function Has_Null_Extension (T : Entity_Id) return Boolean;
83 -- T is a derived tagged type. Check whether the type extension is null.
84 -- If the parent type is fully initialized, T can be treated as such.
86 --------------------------------
87 -- Add_Access_Type_To_Process --
88 --------------------------------
90 procedure Add_Access_Type_To_Process (E : Entity_Id; A : Entity_Id) is
94 Ensure_Freeze_Node (E);
95 L := Access_Types_To_Process (Freeze_Node (E));
99 Set_Access_Types_To_Process (Freeze_Node (E), L);
103 end Add_Access_Type_To_Process;
105 -----------------------
106 -- Alignment_In_Bits --
107 -----------------------
109 function Alignment_In_Bits (E : Entity_Id) return Uint is
111 return Alignment (E) * System_Storage_Unit;
112 end Alignment_In_Bits;
114 -----------------------------------------
115 -- Apply_Compile_Time_Constraint_Error --
116 -----------------------------------------
118 procedure Apply_Compile_Time_Constraint_Error
121 Reason : RT_Exception_Code;
122 Ent : Entity_Id := Empty;
123 Typ : Entity_Id := Empty;
124 Loc : Source_Ptr := No_Location;
125 Rep : Boolean := True;
126 Warn : Boolean := False)
128 Stat : constant Boolean := Is_Static_Expression (N);
138 if No (Compile_Time_Constraint_Error (N, Msg, Ent, Loc, Warn => Warn))
144 -- Now we replace the node by an N_Raise_Constraint_Error node
145 -- This does not need reanalyzing, so set it as analyzed now.
148 Make_Raise_Constraint_Error (Sloc (N),
150 Set_Analyzed (N, True);
152 Set_Raises_Constraint_Error (N);
154 -- If the original expression was marked as static, the result is
155 -- still marked as static, but the Raises_Constraint_Error flag is
156 -- always set so that further static evaluation is not attempted.
159 Set_Is_Static_Expression (N);
161 end Apply_Compile_Time_Constraint_Error;
163 --------------------------
164 -- Build_Actual_Subtype --
165 --------------------------
167 function Build_Actual_Subtype
169 N : Node_Or_Entity_Id) return Node_Id
173 Loc : constant Source_Ptr := Sloc (N);
174 Constraints : List_Id;
180 Disc_Type : Entity_Id;
183 if Nkind (N) = N_Defining_Identifier then
184 Obj := New_Reference_To (N, Loc);
189 if Is_Array_Type (T) then
190 Constraints := New_List;
192 for J in 1 .. Number_Dimensions (T) loop
194 -- Build an array subtype declaration with the nominal
195 -- subtype and the bounds of the actual. Add the declaration
196 -- in front of the local declarations for the subprogram, for
197 -- analysis before any reference to the formal in the body.
200 Make_Attribute_Reference (Loc,
202 Duplicate_Subexpr_No_Checks (Obj, Name_Req => True),
203 Attribute_Name => Name_First,
204 Expressions => New_List (
205 Make_Integer_Literal (Loc, J)));
208 Make_Attribute_Reference (Loc,
210 Duplicate_Subexpr_No_Checks (Obj, Name_Req => True),
211 Attribute_Name => Name_Last,
212 Expressions => New_List (
213 Make_Integer_Literal (Loc, J)));
215 Append (Make_Range (Loc, Lo, Hi), Constraints);
218 -- If the type has unknown discriminants there is no constrained
219 -- subtype to build. This is never called for a formal or for a
220 -- lhs, so returning the type is ok ???
222 elsif Has_Unknown_Discriminants (T) then
226 Constraints := New_List;
228 if Is_Private_Type (T) and then No (Full_View (T)) then
230 -- Type is a generic derived type. Inherit discriminants from
233 Disc_Type := Etype (Base_Type (T));
238 Discr := First_Discriminant (Disc_Type);
240 while Present (Discr) loop
241 Append_To (Constraints,
242 Make_Selected_Component (Loc,
244 Duplicate_Subexpr_No_Checks (Obj),
245 Selector_Name => New_Occurrence_Of (Discr, Loc)));
246 Next_Discriminant (Discr);
251 Make_Defining_Identifier (Loc,
252 Chars => New_Internal_Name ('S'));
253 Set_Is_Internal (Subt);
256 Make_Subtype_Declaration (Loc,
257 Defining_Identifier => Subt,
258 Subtype_Indication =>
259 Make_Subtype_Indication (Loc,
260 Subtype_Mark => New_Reference_To (T, Loc),
262 Make_Index_Or_Discriminant_Constraint (Loc,
263 Constraints => Constraints)));
265 Mark_Rewrite_Insertion (Decl);
267 end Build_Actual_Subtype;
269 ---------------------------------------
270 -- Build_Actual_Subtype_Of_Component --
271 ---------------------------------------
273 function Build_Actual_Subtype_Of_Component
275 N : Node_Id) return Node_Id
277 Loc : constant Source_Ptr := Sloc (N);
278 P : constant Node_Id := Prefix (N);
281 Indx_Type : Entity_Id;
283 Deaccessed_T : Entity_Id;
284 -- This is either a copy of T, or if T is an access type, then it is
285 -- the directly designated type of this access type.
287 function Build_Actual_Array_Constraint return List_Id;
288 -- If one or more of the bounds of the component depends on
289 -- discriminants, build actual constraint using the discriminants
292 function Build_Actual_Record_Constraint return List_Id;
293 -- Similar to previous one, for discriminated components constrained
294 -- by the discriminant of the enclosing object.
296 -----------------------------------
297 -- Build_Actual_Array_Constraint --
298 -----------------------------------
300 function Build_Actual_Array_Constraint return List_Id is
301 Constraints : constant List_Id := New_List;
309 Indx := First_Index (Deaccessed_T);
310 while Present (Indx) loop
311 Old_Lo := Type_Low_Bound (Etype (Indx));
312 Old_Hi := Type_High_Bound (Etype (Indx));
314 if Denotes_Discriminant (Old_Lo) then
316 Make_Selected_Component (Loc,
317 Prefix => New_Copy_Tree (P),
318 Selector_Name => New_Occurrence_Of (Entity (Old_Lo), Loc));
321 Lo := New_Copy_Tree (Old_Lo);
323 -- The new bound will be reanalyzed in the enclosing
324 -- declaration. For literal bounds that come from a type
325 -- declaration, the type of the context must be imposed, so
326 -- insure that analysis will take place. For non-universal
327 -- types this is not strictly necessary.
329 Set_Analyzed (Lo, False);
332 if Denotes_Discriminant (Old_Hi) then
334 Make_Selected_Component (Loc,
335 Prefix => New_Copy_Tree (P),
336 Selector_Name => New_Occurrence_Of (Entity (Old_Hi), Loc));
339 Hi := New_Copy_Tree (Old_Hi);
340 Set_Analyzed (Hi, False);
343 Append (Make_Range (Loc, Lo, Hi), Constraints);
348 end Build_Actual_Array_Constraint;
350 ------------------------------------
351 -- Build_Actual_Record_Constraint --
352 ------------------------------------
354 function Build_Actual_Record_Constraint return List_Id is
355 Constraints : constant List_Id := New_List;
360 D := First_Elmt (Discriminant_Constraint (Deaccessed_T));
361 while Present (D) loop
363 if Denotes_Discriminant (Node (D)) then
364 D_Val := Make_Selected_Component (Loc,
365 Prefix => New_Copy_Tree (P),
366 Selector_Name => New_Occurrence_Of (Entity (Node (D)), Loc));
369 D_Val := New_Copy_Tree (Node (D));
372 Append (D_Val, Constraints);
377 end Build_Actual_Record_Constraint;
379 -- Start of processing for Build_Actual_Subtype_Of_Component
382 if In_Default_Expression then
385 elsif Nkind (N) = N_Explicit_Dereference then
386 if Is_Composite_Type (T)
387 and then not Is_Constrained (T)
388 and then not (Is_Class_Wide_Type (T)
389 and then Is_Constrained (Root_Type (T)))
390 and then not Has_Unknown_Discriminants (T)
392 -- If the type of the dereference is already constrained, it
393 -- is an actual subtype.
395 if Is_Array_Type (Etype (N))
396 and then Is_Constrained (Etype (N))
400 Remove_Side_Effects (P);
401 return Build_Actual_Subtype (T, N);
408 if Ekind (T) = E_Access_Subtype then
409 Deaccessed_T := Designated_Type (T);
414 if Ekind (Deaccessed_T) = E_Array_Subtype then
415 Id := First_Index (Deaccessed_T);
416 Indx_Type := Underlying_Type (Etype (Id));
418 while Present (Id) loop
420 if Denotes_Discriminant (Type_Low_Bound (Indx_Type)) or else
421 Denotes_Discriminant (Type_High_Bound (Indx_Type))
423 Remove_Side_Effects (P);
425 Build_Component_Subtype (
426 Build_Actual_Array_Constraint, Loc, Base_Type (T));
432 elsif Is_Composite_Type (Deaccessed_T)
433 and then Has_Discriminants (Deaccessed_T)
434 and then not Has_Unknown_Discriminants (Deaccessed_T)
436 D := First_Elmt (Discriminant_Constraint (Deaccessed_T));
437 while Present (D) loop
439 if Denotes_Discriminant (Node (D)) then
440 Remove_Side_Effects (P);
442 Build_Component_Subtype (
443 Build_Actual_Record_Constraint, Loc, Base_Type (T));
450 -- If none of the above, the actual and nominal subtypes are the same.
453 end Build_Actual_Subtype_Of_Component;
455 -----------------------------
456 -- Build_Component_Subtype --
457 -----------------------------
459 function Build_Component_Subtype
462 T : Entity_Id) return Node_Id
469 Make_Defining_Identifier (Loc,
470 Chars => New_Internal_Name ('S'));
471 Set_Is_Internal (Subt);
474 Make_Subtype_Declaration (Loc,
475 Defining_Identifier => Subt,
476 Subtype_Indication =>
477 Make_Subtype_Indication (Loc,
478 Subtype_Mark => New_Reference_To (Base_Type (T), Loc),
480 Make_Index_Or_Discriminant_Constraint (Loc,
483 Mark_Rewrite_Insertion (Decl);
485 end Build_Component_Subtype;
487 --------------------------------------------
488 -- Build_Discriminal_Subtype_Of_Component --
489 --------------------------------------------
491 function Build_Discriminal_Subtype_Of_Component
492 (T : Entity_Id) return Node_Id
494 Loc : constant Source_Ptr := Sloc (T);
498 function Build_Discriminal_Array_Constraint return List_Id;
499 -- If one or more of the bounds of the component depends on
500 -- discriminants, build actual constraint using the discriminants
503 function Build_Discriminal_Record_Constraint return List_Id;
504 -- Similar to previous one, for discriminated components constrained
505 -- by the discriminant of the enclosing object.
507 ----------------------------------------
508 -- Build_Discriminal_Array_Constraint --
509 ----------------------------------------
511 function Build_Discriminal_Array_Constraint return List_Id is
512 Constraints : constant List_Id := New_List;
520 Indx := First_Index (T);
521 while Present (Indx) loop
522 Old_Lo := Type_Low_Bound (Etype (Indx));
523 Old_Hi := Type_High_Bound (Etype (Indx));
525 if Denotes_Discriminant (Old_Lo) then
526 Lo := New_Occurrence_Of (Discriminal (Entity (Old_Lo)), Loc);
529 Lo := New_Copy_Tree (Old_Lo);
532 if Denotes_Discriminant (Old_Hi) then
533 Hi := New_Occurrence_Of (Discriminal (Entity (Old_Hi)), Loc);
536 Hi := New_Copy_Tree (Old_Hi);
539 Append (Make_Range (Loc, Lo, Hi), Constraints);
544 end Build_Discriminal_Array_Constraint;
546 -----------------------------------------
547 -- Build_Discriminal_Record_Constraint --
548 -----------------------------------------
550 function Build_Discriminal_Record_Constraint return List_Id is
551 Constraints : constant List_Id := New_List;
556 D := First_Elmt (Discriminant_Constraint (T));
557 while Present (D) loop
558 if Denotes_Discriminant (Node (D)) then
560 New_Occurrence_Of (Discriminal (Entity (Node (D))), Loc);
563 D_Val := New_Copy_Tree (Node (D));
566 Append (D_Val, Constraints);
571 end Build_Discriminal_Record_Constraint;
573 -- Start of processing for Build_Discriminal_Subtype_Of_Component
576 if Ekind (T) = E_Array_Subtype then
577 Id := First_Index (T);
579 while Present (Id) loop
580 if Denotes_Discriminant (Type_Low_Bound (Etype (Id))) or else
581 Denotes_Discriminant (Type_High_Bound (Etype (Id)))
583 return Build_Component_Subtype
584 (Build_Discriminal_Array_Constraint, Loc, T);
590 elsif Ekind (T) = E_Record_Subtype
591 and then Has_Discriminants (T)
592 and then not Has_Unknown_Discriminants (T)
594 D := First_Elmt (Discriminant_Constraint (T));
595 while Present (D) loop
596 if Denotes_Discriminant (Node (D)) then
597 return Build_Component_Subtype
598 (Build_Discriminal_Record_Constraint, Loc, T);
605 -- If none of the above, the actual and nominal subtypes are the same.
608 end Build_Discriminal_Subtype_Of_Component;
610 ------------------------------
611 -- Build_Elaboration_Entity --
612 ------------------------------
614 procedure Build_Elaboration_Entity (N : Node_Id; Spec_Id : Entity_Id) is
615 Loc : constant Source_Ptr := Sloc (N);
616 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
619 Elab_Ent : Entity_Id;
622 -- Ignore if already constructed
624 if Present (Elaboration_Entity (Spec_Id)) then
628 -- Construct name of elaboration entity as xxx_E, where xxx
629 -- is the unit name with dots replaced by double underscore.
630 -- We have to manually construct this name, since it will
631 -- be elaborated in the outer scope, and thus will not have
632 -- the unit name automatically prepended.
634 Get_Name_String (Unit_Name (Unum));
636 -- Replace the %s by _E
638 Name_Buffer (Name_Len - 1 .. Name_Len) := "_E";
640 -- Replace dots by double underscore
643 while P < Name_Len - 2 loop
644 if Name_Buffer (P) = '.' then
645 Name_Buffer (P + 2 .. Name_Len + 1) :=
646 Name_Buffer (P + 1 .. Name_Len);
647 Name_Len := Name_Len + 1;
648 Name_Buffer (P) := '_';
649 Name_Buffer (P + 1) := '_';
656 -- Create elaboration flag
659 Make_Defining_Identifier (Loc, Chars => Name_Find);
660 Set_Elaboration_Entity (Spec_Id, Elab_Ent);
662 if No (Declarations (Aux_Decls_Node (N))) then
663 Set_Declarations (Aux_Decls_Node (N), New_List);
667 Make_Object_Declaration (Loc,
668 Defining_Identifier => Elab_Ent,
670 New_Occurrence_Of (Standard_Boolean, Loc),
672 New_Occurrence_Of (Standard_False, Loc));
674 Append_To (Declarations (Aux_Decls_Node (N)), Decl);
677 -- Reset True_Constant indication, since we will indeed
678 -- assign a value to the variable in the binder main.
680 Set_Is_True_Constant (Elab_Ent, False);
681 Set_Current_Value (Elab_Ent, Empty);
683 -- We do not want any further qualification of the name (if we did
684 -- not do this, we would pick up the name of the generic package
685 -- in the case of a library level generic instantiation).
687 Set_Has_Qualified_Name (Elab_Ent);
688 Set_Has_Fully_Qualified_Name (Elab_Ent);
689 end Build_Elaboration_Entity;
691 -----------------------------------
692 -- Cannot_Raise_Constraint_Error --
693 -----------------------------------
695 function Cannot_Raise_Constraint_Error (Expr : Node_Id) return Boolean is
697 if Compile_Time_Known_Value (Expr) then
700 elsif Do_Range_Check (Expr) then
703 elsif Raises_Constraint_Error (Expr) then
711 when N_Expanded_Name =>
714 when N_Selected_Component =>
715 return not Do_Discriminant_Check (Expr);
717 when N_Attribute_Reference =>
718 if Do_Overflow_Check (Expr) then
721 elsif No (Expressions (Expr)) then
726 N : Node_Id := First (Expressions (Expr));
729 while Present (N) loop
730 if Cannot_Raise_Constraint_Error (N) then
741 when N_Type_Conversion =>
742 if Do_Overflow_Check (Expr)
743 or else Do_Length_Check (Expr)
744 or else Do_Tag_Check (Expr)
749 Cannot_Raise_Constraint_Error (Expression (Expr));
752 when N_Unchecked_Type_Conversion =>
753 return Cannot_Raise_Constraint_Error (Expression (Expr));
756 if Do_Overflow_Check (Expr) then
760 Cannot_Raise_Constraint_Error (Right_Opnd (Expr));
767 if Do_Division_Check (Expr)
768 or else Do_Overflow_Check (Expr)
773 Cannot_Raise_Constraint_Error (Left_Opnd (Expr))
775 Cannot_Raise_Constraint_Error (Right_Opnd (Expr));
794 N_Op_Shift_Right_Arithmetic |
798 if Do_Overflow_Check (Expr) then
802 Cannot_Raise_Constraint_Error (Left_Opnd (Expr))
804 Cannot_Raise_Constraint_Error (Right_Opnd (Expr));
811 end Cannot_Raise_Constraint_Error;
813 --------------------------
814 -- Check_Fully_Declared --
815 --------------------------
817 procedure Check_Fully_Declared (T : Entity_Id; N : Node_Id) is
819 if Ekind (T) = E_Incomplete_Type then
821 -- Ada0Y (AI-50217): If the type is available through a limited
822 -- with_clause, verify that its full view has been analyzed.
824 if From_With_Type (T)
825 and then Present (Non_Limited_View (T))
826 and then Ekind (Non_Limited_View (T)) /= E_Incomplete_Type
828 -- The non-limited view is fully declared
833 ("premature usage of incomplete}", N, First_Subtype (T));
836 elsif Has_Private_Component (T)
837 and then not Is_Generic_Type (Root_Type (T))
838 and then not In_Default_Expression
841 -- Special case: if T is the anonymous type created for a single
842 -- task or protected object, use the name of the source object.
844 if Is_Concurrent_Type (T)
845 and then not Comes_From_Source (T)
846 and then Nkind (N) = N_Object_Declaration
848 Error_Msg_NE ("type of& has incomplete component", N,
849 Defining_Identifier (N));
853 ("premature usage of incomplete}", N, First_Subtype (T));
856 end Check_Fully_Declared;
858 ------------------------------------------
859 -- Check_Potentially_Blocking_Operation --
860 ------------------------------------------
862 procedure Check_Potentially_Blocking_Operation (N : Node_Id) is
864 Loc : constant Source_Ptr := Sloc (N);
867 -- N is one of the potentially blocking operations listed in
868 -- 9.5.1 (8). When using the Ravenscar profile, raise Program_Error
869 -- before N if the context is a protected action. Otherwise, only issue
870 -- a warning, since some users are relying on blocking operations
871 -- inside protected objects.
872 -- Indirect blocking through a subprogram call
873 -- cannot be diagnosed statically without interprocedural analysis,
874 -- so we do not attempt to do it here.
876 S := Scope (Current_Scope);
878 while Present (S) and then S /= Standard_Standard loop
879 if Is_Protected_Type (S) then
880 if Restricted_Profile then
881 Insert_Before_And_Analyze (N,
882 Make_Raise_Program_Error (Loc,
883 Reason => PE_Potentially_Blocking_Operation));
884 Error_Msg_N ("potentially blocking operation, " &
885 " Program Error will be raised at run time?", N);
889 ("potentially blocking operation in protected operation?", N);
897 end Check_Potentially_Blocking_Operation;
903 procedure Check_VMS (Construct : Node_Id) is
905 if not OpenVMS_On_Target then
907 ("this construct is allowed only in Open'V'M'S", Construct);
911 ----------------------------------
912 -- Collect_Primitive_Operations --
913 ----------------------------------
915 function Collect_Primitive_Operations (T : Entity_Id) return Elist_Id is
916 B_Type : constant Entity_Id := Base_Type (T);
917 B_Decl : constant Node_Id := Original_Node (Parent (B_Type));
918 B_Scope : Entity_Id := Scope (B_Type);
922 Formal_Derived : Boolean := False;
926 -- For tagged types, the primitive operations are collected as they
927 -- are declared, and held in an explicit list which is simply returned.
929 if Is_Tagged_Type (B_Type) then
930 return Primitive_Operations (B_Type);
932 -- An untagged generic type that is a derived type inherits the
933 -- primitive operations of its parent type. Other formal types only
934 -- have predefined operators, which are not explicitly represented.
936 elsif Is_Generic_Type (B_Type) then
937 if Nkind (B_Decl) = N_Formal_Type_Declaration
938 and then Nkind (Formal_Type_Definition (B_Decl))
939 = N_Formal_Derived_Type_Definition
941 Formal_Derived := True;
943 return New_Elmt_List;
947 Op_List := New_Elmt_List;
949 if B_Scope = Standard_Standard then
950 if B_Type = Standard_String then
951 Append_Elmt (Standard_Op_Concat, Op_List);
953 elsif B_Type = Standard_Wide_String then
954 Append_Elmt (Standard_Op_Concatw, Op_List);
960 elsif (Is_Package (B_Scope)
962 Parent (Declaration_Node (First_Subtype (T))))
965 or else Is_Derived_Type (B_Type)
967 -- The primitive operations appear after the base type, except
968 -- if the derivation happens within the private part of B_Scope
969 -- and the type is a private type, in which case both the type
970 -- and some primitive operations may appear before the base
971 -- type, and the list of candidates starts after the type.
973 if In_Open_Scopes (B_Scope)
974 and then Scope (T) = B_Scope
975 and then In_Private_Part (B_Scope)
977 Id := Next_Entity (T);
979 Id := Next_Entity (B_Type);
982 while Present (Id) loop
984 -- Note that generic formal subprograms are not
985 -- considered to be primitive operations and thus
986 -- are never inherited.
988 if Is_Overloadable (Id)
989 and then Nkind (Parent (Parent (Id)))
990 /= N_Formal_Subprogram_Declaration
994 if Base_Type (Etype (Id)) = B_Type then
997 Formal := First_Formal (Id);
998 while Present (Formal) loop
999 if Base_Type (Etype (Formal)) = B_Type then
1003 elsif Ekind (Etype (Formal)) = E_Anonymous_Access_Type
1005 (Designated_Type (Etype (Formal))) = B_Type
1011 Next_Formal (Formal);
1015 -- For a formal derived type, the only primitives are the
1016 -- ones inherited from the parent type. Operations appearing
1017 -- in the package declaration are not primitive for it.
1020 and then (not Formal_Derived
1021 or else Present (Alias (Id)))
1023 Append_Elmt (Id, Op_List);
1029 -- For a type declared in System, some of its operations
1030 -- may appear in the target-specific extension to System.
1033 and then Chars (B_Scope) = Name_System
1034 and then Scope (B_Scope) = Standard_Standard
1035 and then Present_System_Aux
1037 B_Scope := System_Aux_Id;
1038 Id := First_Entity (System_Aux_Id);
1044 end Collect_Primitive_Operations;
1046 -----------------------------------
1047 -- Compile_Time_Constraint_Error --
1048 -----------------------------------
1050 function Compile_Time_Constraint_Error
1053 Ent : Entity_Id := Empty;
1054 Loc : Source_Ptr := No_Location;
1055 Warn : Boolean := False) return Node_Id
1057 Msgc : String (1 .. Msg'Length + 2);
1065 -- A static constraint error in an instance body is not a fatal error.
1066 -- we choose to inhibit the message altogether, because there is no
1067 -- obvious node (for now) on which to post it. On the other hand the
1068 -- offending node must be replaced with a constraint_error in any case.
1070 -- No messages are generated if we already posted an error on this node
1072 if not Error_Posted (N) then
1073 if Loc /= No_Location then
1079 -- Make all such messages unconditional
1081 Msgc (1 .. Msg'Length) := Msg;
1082 Msgc (Msg'Length + 1) := '!';
1083 Msgl := Msg'Length + 1;
1085 -- Message is a warning, even in Ada 95 case
1087 if Msg (Msg'Length) = '?' then
1090 -- In Ada 83, all messages are warnings. In the private part and
1091 -- the body of an instance, constraint_checks are only warnings.
1092 -- We also make this a warning if the Warn parameter is set.
1094 elsif Warn or else (Ada_83 and then Comes_From_Source (N)) then
1099 elsif In_Instance_Not_Visible then
1104 -- Otherwise we have a real error message (Ada 95 static case)
1110 -- Should we generate a warning? The answer is not quite yes. The
1111 -- very annoying exception occurs in the case of a short circuit
1112 -- operator where the left operand is static and decisive. Climb
1113 -- parents to see if that is the case we have here.
1121 if (Nkind (P) = N_And_Then
1122 and then Compile_Time_Known_Value (Left_Opnd (P))
1123 and then Is_False (Expr_Value (Left_Opnd (P))))
1124 or else (Nkind (P) = N_Or_Else
1125 and then Compile_Time_Known_Value (Left_Opnd (P))
1126 and then Is_True (Expr_Value (Left_Opnd (P))))
1131 elsif Nkind (P) = N_Component_Association
1132 and then Nkind (Parent (P)) = N_Aggregate
1134 null; -- Keep going.
1137 exit when Nkind (P) not in N_Subexpr;
1142 if Present (Ent) then
1143 Error_Msg_NEL (Msgc (1 .. Msgl), N, Ent, Eloc);
1145 Error_Msg_NEL (Msgc (1 .. Msgl), N, Etype (N), Eloc);
1149 if Inside_Init_Proc then
1151 ("\& will be raised for objects of this type!?",
1152 N, Standard_Constraint_Error, Eloc);
1155 ("\& will be raised at run time!?",
1156 N, Standard_Constraint_Error, Eloc);
1160 ("\static expression raises&!",
1161 N, Standard_Constraint_Error, Eloc);
1167 end Compile_Time_Constraint_Error;
1169 -----------------------
1170 -- Conditional_Delay --
1171 -----------------------
1173 procedure Conditional_Delay (New_Ent, Old_Ent : Entity_Id) is
1175 if Has_Delayed_Freeze (Old_Ent) and then not Is_Frozen (Old_Ent) then
1176 Set_Has_Delayed_Freeze (New_Ent);
1178 end Conditional_Delay;
1180 --------------------
1181 -- Current_Entity --
1182 --------------------
1184 -- The currently visible definition for a given identifier is the
1185 -- one most chained at the start of the visibility chain, i.e. the
1186 -- one that is referenced by the Node_Id value of the name of the
1187 -- given identifier.
1189 function Current_Entity (N : Node_Id) return Entity_Id is
1191 return Get_Name_Entity_Id (Chars (N));
1194 -----------------------------
1195 -- Current_Entity_In_Scope --
1196 -----------------------------
1198 function Current_Entity_In_Scope (N : Node_Id) return Entity_Id is
1200 CS : constant Entity_Id := Current_Scope;
1202 Transient_Case : constant Boolean := Scope_Is_Transient;
1205 E := Get_Name_Entity_Id (Chars (N));
1208 and then Scope (E) /= CS
1209 and then (not Transient_Case or else Scope (E) /= Scope (CS))
1215 end Current_Entity_In_Scope;
1221 function Current_Scope return Entity_Id is
1223 if Scope_Stack.Last = -1 then
1224 return Standard_Standard;
1227 C : constant Entity_Id :=
1228 Scope_Stack.Table (Scope_Stack.Last).Entity;
1233 return Standard_Standard;
1239 ------------------------
1240 -- Current_Subprogram --
1241 ------------------------
1243 function Current_Subprogram return Entity_Id is
1244 Scop : constant Entity_Id := Current_Scope;
1247 if Is_Subprogram (Scop) or else Is_Generic_Subprogram (Scop) then
1250 return Enclosing_Subprogram (Scop);
1252 end Current_Subprogram;
1254 ---------------------
1255 -- Defining_Entity --
1256 ---------------------
1258 function Defining_Entity (N : Node_Id) return Entity_Id is
1259 K : constant Node_Kind := Nkind (N);
1260 Err : Entity_Id := Empty;
1265 N_Subprogram_Declaration |
1266 N_Abstract_Subprogram_Declaration |
1268 N_Package_Declaration |
1269 N_Subprogram_Renaming_Declaration |
1270 N_Subprogram_Body_Stub |
1271 N_Generic_Subprogram_Declaration |
1272 N_Generic_Package_Declaration |
1273 N_Formal_Subprogram_Declaration
1275 return Defining_Entity (Specification (N));
1278 N_Component_Declaration |
1279 N_Defining_Program_Unit_Name |
1280 N_Discriminant_Specification |
1282 N_Entry_Declaration |
1283 N_Entry_Index_Specification |
1284 N_Exception_Declaration |
1285 N_Exception_Renaming_Declaration |
1286 N_Formal_Object_Declaration |
1287 N_Formal_Package_Declaration |
1288 N_Formal_Type_Declaration |
1289 N_Full_Type_Declaration |
1290 N_Implicit_Label_Declaration |
1291 N_Incomplete_Type_Declaration |
1292 N_Loop_Parameter_Specification |
1293 N_Number_Declaration |
1294 N_Object_Declaration |
1295 N_Object_Renaming_Declaration |
1296 N_Package_Body_Stub |
1297 N_Parameter_Specification |
1298 N_Private_Extension_Declaration |
1299 N_Private_Type_Declaration |
1301 N_Protected_Body_Stub |
1302 N_Protected_Type_Declaration |
1303 N_Single_Protected_Declaration |
1304 N_Single_Task_Declaration |
1305 N_Subtype_Declaration |
1308 N_Task_Type_Declaration
1310 return Defining_Identifier (N);
1313 return Defining_Entity (Proper_Body (N));
1316 N_Function_Instantiation |
1317 N_Function_Specification |
1318 N_Generic_Function_Renaming_Declaration |
1319 N_Generic_Package_Renaming_Declaration |
1320 N_Generic_Procedure_Renaming_Declaration |
1322 N_Package_Instantiation |
1323 N_Package_Renaming_Declaration |
1324 N_Package_Specification |
1325 N_Procedure_Instantiation |
1326 N_Procedure_Specification
1329 Nam : constant Node_Id := Defining_Unit_Name (N);
1332 if Nkind (Nam) in N_Entity then
1335 -- For Error, make up a name and attach to declaration
1336 -- so we can continue semantic analysis
1338 elsif Nam = Error then
1340 Make_Defining_Identifier (Sloc (N),
1341 Chars => New_Internal_Name ('T'));
1342 Set_Defining_Unit_Name (N, Err);
1345 -- If not an entity, get defining identifier
1348 return Defining_Identifier (Nam);
1352 when N_Block_Statement =>
1353 return Entity (Identifier (N));
1356 raise Program_Error;
1359 end Defining_Entity;
1361 --------------------------
1362 -- Denotes_Discriminant --
1363 --------------------------
1365 function Denotes_Discriminant
1367 Check_Protected : Boolean := False) return Boolean
1371 if not Is_Entity_Name (N)
1372 or else No (Entity (N))
1379 -- If we are checking for a protected type, the discriminant may have
1380 -- been rewritten as the corresponding discriminal of the original type
1381 -- or of the corresponding concurrent record, depending on whether we
1382 -- are in the spec or body of the protected type.
1384 return Ekind (E) = E_Discriminant
1387 and then Ekind (E) = E_In_Parameter
1388 and then Present (Discriminal_Link (E))
1390 (Is_Protected_Type (Scope (Discriminal_Link (E)))
1392 Is_Concurrent_Record_Type (Scope (Discriminal_Link (E)))));
1394 end Denotes_Discriminant;
1396 -----------------------------
1397 -- Depends_On_Discriminant --
1398 -----------------------------
1400 function Depends_On_Discriminant (N : Node_Id) return Boolean is
1405 Get_Index_Bounds (N, L, H);
1406 return Denotes_Discriminant (L) or else Denotes_Discriminant (H);
1407 end Depends_On_Discriminant;
1409 -------------------------
1410 -- Designate_Same_Unit --
1411 -------------------------
1413 function Designate_Same_Unit
1415 Name2 : Node_Id) return Boolean
1417 K1 : constant Node_Kind := Nkind (Name1);
1418 K2 : constant Node_Kind := Nkind (Name2);
1420 function Prefix_Node (N : Node_Id) return Node_Id;
1421 -- Returns the parent unit name node of a defining program unit name
1422 -- or the prefix if N is a selected component or an expanded name.
1424 function Select_Node (N : Node_Id) return Node_Id;
1425 -- Returns the defining identifier node of a defining program unit
1426 -- name or the selector node if N is a selected component or an
1433 function Prefix_Node (N : Node_Id) return Node_Id is
1435 if Nkind (N) = N_Defining_Program_Unit_Name then
1447 function Select_Node (N : Node_Id) return Node_Id is
1449 if Nkind (N) = N_Defining_Program_Unit_Name then
1450 return Defining_Identifier (N);
1453 return Selector_Name (N);
1457 -- Start of processing for Designate_Next_Unit
1460 if (K1 = N_Identifier or else
1461 K1 = N_Defining_Identifier)
1463 (K2 = N_Identifier or else
1464 K2 = N_Defining_Identifier)
1466 return Chars (Name1) = Chars (Name2);
1469 (K1 = N_Expanded_Name or else
1470 K1 = N_Selected_Component or else
1471 K1 = N_Defining_Program_Unit_Name)
1473 (K2 = N_Expanded_Name or else
1474 K2 = N_Selected_Component or else
1475 K2 = N_Defining_Program_Unit_Name)
1478 (Chars (Select_Node (Name1)) = Chars (Select_Node (Name2)))
1480 Designate_Same_Unit (Prefix_Node (Name1), Prefix_Node (Name2));
1485 end Designate_Same_Unit;
1487 ----------------------------
1488 -- Enclosing_Generic_Body --
1489 ----------------------------
1491 function Enclosing_Generic_Body
1492 (E : Entity_Id) return Node_Id
1501 while Present (P) loop
1502 if Nkind (P) = N_Package_Body
1503 or else Nkind (P) = N_Subprogram_Body
1505 Spec := Corresponding_Spec (P);
1507 if Present (Spec) then
1508 Decl := Unit_Declaration_Node (Spec);
1510 if Nkind (Decl) = N_Generic_Package_Declaration
1511 or else Nkind (Decl) = N_Generic_Subprogram_Declaration
1522 end Enclosing_Generic_Body;
1524 -------------------------------
1525 -- Enclosing_Lib_Unit_Entity --
1526 -------------------------------
1528 function Enclosing_Lib_Unit_Entity return Entity_Id is
1529 Unit_Entity : Entity_Id := Current_Scope;
1532 -- Look for enclosing library unit entity by following scope links.
1533 -- Equivalent to, but faster than indexing through the scope stack.
1535 while (Present (Scope (Unit_Entity))
1536 and then Scope (Unit_Entity) /= Standard_Standard)
1537 and not Is_Child_Unit (Unit_Entity)
1539 Unit_Entity := Scope (Unit_Entity);
1543 end Enclosing_Lib_Unit_Entity;
1545 -----------------------------
1546 -- Enclosing_Lib_Unit_Node --
1547 -----------------------------
1549 function Enclosing_Lib_Unit_Node (N : Node_Id) return Node_Id is
1550 Current_Node : Node_Id := N;
1553 while Present (Current_Node)
1554 and then Nkind (Current_Node) /= N_Compilation_Unit
1556 Current_Node := Parent (Current_Node);
1559 if Nkind (Current_Node) /= N_Compilation_Unit then
1563 return Current_Node;
1564 end Enclosing_Lib_Unit_Node;
1566 --------------------------
1567 -- Enclosing_Subprogram --
1568 --------------------------
1570 function Enclosing_Subprogram (E : Entity_Id) return Entity_Id is
1571 Dynamic_Scope : constant Entity_Id := Enclosing_Dynamic_Scope (E);
1574 if Dynamic_Scope = Standard_Standard then
1577 elsif Ekind (Dynamic_Scope) = E_Subprogram_Body then
1578 return Corresponding_Spec (Parent (Parent (Dynamic_Scope)));
1580 elsif Ekind (Dynamic_Scope) = E_Block then
1581 return Enclosing_Subprogram (Dynamic_Scope);
1583 elsif Ekind (Dynamic_Scope) = E_Task_Type then
1584 return Get_Task_Body_Procedure (Dynamic_Scope);
1586 elsif Convention (Dynamic_Scope) = Convention_Protected then
1587 return Protected_Body_Subprogram (Dynamic_Scope);
1590 return Dynamic_Scope;
1592 end Enclosing_Subprogram;
1594 ------------------------
1595 -- Ensure_Freeze_Node --
1596 ------------------------
1598 procedure Ensure_Freeze_Node (E : Entity_Id) is
1602 if No (Freeze_Node (E)) then
1603 FN := Make_Freeze_Entity (Sloc (E));
1604 Set_Has_Delayed_Freeze (E);
1605 Set_Freeze_Node (E, FN);
1606 Set_Access_Types_To_Process (FN, No_Elist);
1607 Set_TSS_Elist (FN, No_Elist);
1610 end Ensure_Freeze_Node;
1616 procedure Enter_Name (Def_Id : Node_Id) is
1617 C : constant Entity_Id := Current_Entity (Def_Id);
1618 E : constant Entity_Id := Current_Entity_In_Scope (Def_Id);
1619 S : constant Entity_Id := Current_Scope;
1622 Generate_Definition (Def_Id);
1624 -- Add new name to current scope declarations. Check for duplicate
1625 -- declaration, which may or may not be a genuine error.
1629 -- Case of previous entity entered because of a missing declaration
1630 -- or else a bad subtype indication. Best is to use the new entity,
1631 -- and make the previous one invisible.
1633 if Etype (E) = Any_Type then
1634 Set_Is_Immediately_Visible (E, False);
1636 -- Case of renaming declaration constructed for package instances.
1637 -- if there is an explicit declaration with the same identifier,
1638 -- the renaming is not immediately visible any longer, but remains
1639 -- visible through selected component notation.
1641 elsif Nkind (Parent (E)) = N_Package_Renaming_Declaration
1642 and then not Comes_From_Source (E)
1644 Set_Is_Immediately_Visible (E, False);
1646 -- The new entity may be the package renaming, which has the same
1647 -- same name as a generic formal which has been seen already.
1649 elsif Nkind (Parent (Def_Id)) = N_Package_Renaming_Declaration
1650 and then not Comes_From_Source (Def_Id)
1652 Set_Is_Immediately_Visible (E, False);
1654 -- For a fat pointer corresponding to a remote access to subprogram,
1655 -- we use the same identifier as the RAS type, so that the proper
1656 -- name appears in the stub. This type is only retrieved through
1657 -- the RAS type and never by visibility, and is not added to the
1658 -- visibility list (see below).
1660 elsif Nkind (Parent (Def_Id)) = N_Full_Type_Declaration
1661 and then Present (Corresponding_Remote_Type (Def_Id))
1665 -- A controller component for a type extension overrides the
1666 -- inherited component.
1668 elsif Chars (E) = Name_uController then
1671 -- Case of an implicit operation or derived literal. The new entity
1672 -- hides the implicit one, which is removed from all visibility,
1673 -- i.e. the entity list of its scope, and homonym chain of its name.
1675 elsif (Is_Overloadable (E) and then Present (Alias (E)))
1676 or else Is_Internal (E)
1677 or else (Ekind (E) = E_Enumeration_Literal
1678 and then Is_Derived_Type (Etype (E)))
1682 Prev_Vis : Entity_Id;
1683 Decl : constant Node_Id := Parent (E);
1686 -- If E is an implicit declaration, it cannot be the first
1687 -- entity in the scope.
1689 Prev := First_Entity (Current_Scope);
1691 while Present (Prev)
1692 and then Next_Entity (Prev) /= E
1699 -- If E is not on the entity chain of the current scope,
1700 -- it is an implicit declaration in the generic formal
1701 -- part of a generic subprogram. When analyzing the body,
1702 -- the generic formals are visible but not on the entity
1703 -- chain of the subprogram. The new entity will become
1704 -- the visible one in the body.
1707 (Nkind (Parent (Decl)) = N_Generic_Subprogram_Declaration);
1711 Set_Next_Entity (Prev, Next_Entity (E));
1713 if No (Next_Entity (Prev)) then
1714 Set_Last_Entity (Current_Scope, Prev);
1717 if E = Current_Entity (E) then
1721 Prev_Vis := Current_Entity (E);
1722 while Homonym (Prev_Vis) /= E loop
1723 Prev_Vis := Homonym (Prev_Vis);
1727 if Present (Prev_Vis) then
1729 -- Skip E in the visibility chain
1731 Set_Homonym (Prev_Vis, Homonym (E));
1734 Set_Name_Entity_Id (Chars (E), Homonym (E));
1739 -- This section of code could use a comment ???
1741 elsif Present (Etype (E))
1742 and then Is_Concurrent_Type (Etype (E))
1747 -- In the body or private part of an instance, a type extension
1748 -- may introduce a component with the same name as that of an
1749 -- actual. The legality rule is not enforced, but the semantics
1750 -- of the full type with two components of the same name are not
1751 -- clear at this point ???
1753 elsif In_Instance_Not_Visible then
1756 -- When compiling a package body, some child units may have become
1757 -- visible. They cannot conflict with local entities that hide them.
1759 elsif Is_Child_Unit (E)
1760 and then In_Open_Scopes (Scope (E))
1761 and then not Is_Immediately_Visible (E)
1765 -- Conversely, with front-end inlining we may compile the parent
1766 -- body first, and a child unit subsequently. The context is now
1767 -- the parent spec, and body entities are not visible.
1769 elsif Is_Child_Unit (Def_Id)
1770 and then Is_Package_Body_Entity (E)
1771 and then not In_Package_Body (Current_Scope)
1775 -- Case of genuine duplicate declaration
1778 Error_Msg_Sloc := Sloc (E);
1780 -- If the previous declaration is an incomplete type declaration
1781 -- this may be an attempt to complete it with a private type.
1782 -- The following avoids confusing cascaded errors.
1784 if Nkind (Parent (E)) = N_Incomplete_Type_Declaration
1785 and then Nkind (Parent (Def_Id)) = N_Private_Type_Declaration
1788 ("incomplete type cannot be completed" &
1789 " with a private declaration",
1791 Set_Is_Immediately_Visible (E, False);
1792 Set_Full_View (E, Def_Id);
1794 elsif Ekind (E) = E_Discriminant
1795 and then Present (Scope (Def_Id))
1796 and then Scope (Def_Id) /= Current_Scope
1798 -- An inherited component of a record conflicts with
1799 -- a new discriminant. The discriminant is inserted first
1800 -- in the scope, but the error should be posted on it, not
1801 -- on the component.
1803 Error_Msg_Sloc := Sloc (Def_Id);
1804 Error_Msg_N ("& conflicts with declaration#", E);
1807 -- If the name of the unit appears in its own context clause,
1808 -- a dummy package with the name has already been created, and
1809 -- the error emitted. Try to continue quietly.
1811 elsif Error_Posted (E)
1812 and then Sloc (E) = No_Location
1813 and then Nkind (Parent (E)) = N_Package_Specification
1814 and then Current_Scope = Standard_Standard
1816 Set_Scope (Def_Id, Current_Scope);
1820 Error_Msg_N ("& conflicts with declaration#", Def_Id);
1822 -- Avoid cascaded messages with duplicate components in
1825 if Ekind (E) = E_Component
1826 or else Ekind (E) = E_Discriminant
1832 if Nkind (Parent (Parent (Def_Id)))
1833 = N_Generic_Subprogram_Declaration
1835 Defining_Entity (Specification (Parent (Parent (Def_Id))))
1837 Error_Msg_N ("\generic units cannot be overloaded", Def_Id);
1840 -- If entity is in standard, then we are in trouble, because
1841 -- it means that we have a library package with a duplicated
1842 -- name. That's hard to recover from, so abort!
1844 if S = Standard_Standard then
1845 raise Unrecoverable_Error;
1847 -- Otherwise we continue with the declaration. Having two
1848 -- identical declarations should not cause us too much trouble!
1856 -- If we fall through, declaration is OK , or OK enough to continue
1858 -- If Def_Id is a discriminant or a record component we are in the
1859 -- midst of inheriting components in a derived record definition.
1860 -- Preserve their Ekind and Etype.
1862 if Ekind (Def_Id) = E_Discriminant
1863 or else Ekind (Def_Id) = E_Component
1867 -- If a type is already set, leave it alone (happens whey a type
1868 -- declaration is reanalyzed following a call to the optimizer)
1870 elsif Present (Etype (Def_Id)) then
1873 -- Otherwise, the kind E_Void insures that premature uses of the entity
1874 -- will be detected. Any_Type insures that no cascaded errors will occur
1877 Set_Ekind (Def_Id, E_Void);
1878 Set_Etype (Def_Id, Any_Type);
1881 -- Inherited discriminants and components in derived record types are
1882 -- immediately visible. Itypes are not.
1884 if Ekind (Def_Id) = E_Discriminant
1885 or else Ekind (Def_Id) = E_Component
1886 or else (No (Corresponding_Remote_Type (Def_Id))
1887 and then not Is_Itype (Def_Id))
1889 Set_Is_Immediately_Visible (Def_Id);
1890 Set_Current_Entity (Def_Id);
1893 Set_Homonym (Def_Id, C);
1894 Append_Entity (Def_Id, S);
1895 Set_Public_Status (Def_Id);
1897 -- Warn if new entity hides an old one
1900 and then Present (C)
1901 and then Length_Of_Name (Chars (C)) /= 1
1902 and then Comes_From_Source (C)
1903 and then Comes_From_Source (Def_Id)
1904 and then In_Extended_Main_Source_Unit (Def_Id)
1906 Error_Msg_Sloc := Sloc (C);
1907 Error_Msg_N ("declaration hides &#?", Def_Id);
1911 --------------------------
1912 -- Explain_Limited_Type --
1913 --------------------------
1915 procedure Explain_Limited_Type (T : Entity_Id; N : Node_Id) is
1919 -- For array, component type must be limited
1921 if Is_Array_Type (T) then
1922 Error_Msg_Node_2 := T;
1924 ("component type& of type& is limited", N, Component_Type (T));
1925 Explain_Limited_Type (Component_Type (T), N);
1927 elsif Is_Record_Type (T) then
1929 -- No need for extra messages if explicit limited record
1931 if Is_Limited_Record (Base_Type (T)) then
1935 -- Otherwise find a limited component
1937 C := First_Component (T);
1938 while Present (C) loop
1939 if Is_Limited_Type (Etype (C)) then
1940 Error_Msg_Node_2 := T;
1941 Error_Msg_NE ("\component& of type& has limited type", N, C);
1942 Explain_Limited_Type (Etype (C), N);
1949 -- It's odd if the loop falls through, but this is only an extra
1950 -- error message, so we just let it go and ignore the situation.
1954 end Explain_Limited_Type;
1956 -------------------------------------
1957 -- Find_Corresponding_Discriminant --
1958 -------------------------------------
1960 function Find_Corresponding_Discriminant
1962 Typ : Entity_Id) return Entity_Id
1964 Par_Disc : Entity_Id;
1965 Old_Disc : Entity_Id;
1966 New_Disc : Entity_Id;
1969 Par_Disc := Original_Record_Component (Original_Discriminant (Id));
1971 -- The original type may currently be private, and the discriminant
1972 -- only appear on its full view.
1974 if Is_Private_Type (Scope (Par_Disc))
1975 and then not Has_Discriminants (Scope (Par_Disc))
1976 and then Present (Full_View (Scope (Par_Disc)))
1978 Old_Disc := First_Discriminant (Full_View (Scope (Par_Disc)));
1980 Old_Disc := First_Discriminant (Scope (Par_Disc));
1983 if Is_Class_Wide_Type (Typ) then
1984 New_Disc := First_Discriminant (Root_Type (Typ));
1986 New_Disc := First_Discriminant (Typ);
1989 while Present (Old_Disc) and then Present (New_Disc) loop
1990 if Old_Disc = Par_Disc then
1993 Next_Discriminant (Old_Disc);
1994 Next_Discriminant (New_Disc);
1998 -- Should always find it
2000 raise Program_Error;
2001 end Find_Corresponding_Discriminant;
2003 -----------------------------
2004 -- Find_Static_Alternative --
2005 -----------------------------
2007 function Find_Static_Alternative (N : Node_Id) return Node_Id is
2008 Expr : constant Node_Id := Expression (N);
2009 Val : constant Uint := Expr_Value (Expr);
2014 Alt := First (Alternatives (N));
2017 if Nkind (Alt) /= N_Pragma then
2018 Choice := First (Discrete_Choices (Alt));
2020 while Present (Choice) loop
2022 -- Others choice, always matches
2024 if Nkind (Choice) = N_Others_Choice then
2027 -- Range, check if value is in the range
2029 elsif Nkind (Choice) = N_Range then
2031 Val >= Expr_Value (Low_Bound (Choice))
2033 Val <= Expr_Value (High_Bound (Choice));
2035 -- Choice is a subtype name. Note that we know it must
2036 -- be a static subtype, since otherwise it would have
2037 -- been diagnosed as illegal.
2039 elsif Is_Entity_Name (Choice)
2040 and then Is_Type (Entity (Choice))
2042 exit Search when Is_In_Range (Expr, Etype (Choice));
2044 -- Choice is a subtype indication
2046 elsif Nkind (Choice) = N_Subtype_Indication then
2048 C : constant Node_Id := Constraint (Choice);
2049 R : constant Node_Id := Range_Expression (C);
2053 Val >= Expr_Value (Low_Bound (R))
2055 Val <= Expr_Value (High_Bound (R));
2058 -- Choice is a simple expression
2061 exit Search when Val = Expr_Value (Choice);
2069 pragma Assert (Present (Alt));
2072 -- The above loop *must* terminate by finding a match, since
2073 -- we know the case statement is valid, and the value of the
2074 -- expression is known at compile time. When we fall out of
2075 -- the loop, Alt points to the alternative that we know will
2076 -- be selected at run time.
2079 end Find_Static_Alternative;
2085 function First_Actual (Node : Node_Id) return Node_Id is
2089 if No (Parameter_Associations (Node)) then
2093 N := First (Parameter_Associations (Node));
2095 if Nkind (N) = N_Parameter_Association then
2096 return First_Named_Actual (Node);
2102 -------------------------
2103 -- Full_Qualified_Name --
2104 -------------------------
2106 function Full_Qualified_Name (E : Entity_Id) return String_Id is
2108 pragma Warnings (Off, Res);
2110 function Internal_Full_Qualified_Name (E : Entity_Id) return String_Id;
2111 -- Compute recursively the qualified name without NUL at the end.
2113 ----------------------------------
2114 -- Internal_Full_Qualified_Name --
2115 ----------------------------------
2117 function Internal_Full_Qualified_Name (E : Entity_Id) return String_Id is
2118 Ent : Entity_Id := E;
2119 Parent_Name : String_Id := No_String;
2122 -- Deals properly with child units
2124 if Nkind (Ent) = N_Defining_Program_Unit_Name then
2125 Ent := Defining_Identifier (Ent);
2128 -- Compute recursively the qualification. Only "Standard" has no
2131 if Present (Scope (Scope (Ent))) then
2132 Parent_Name := Internal_Full_Qualified_Name (Scope (Ent));
2135 -- Every entity should have a name except some expanded blocks
2136 -- don't bother about those.
2138 if Chars (Ent) = No_Name then
2142 -- Add a period between Name and qualification
2144 if Parent_Name /= No_String then
2145 Start_String (Parent_Name);
2146 Store_String_Char (Get_Char_Code ('.'));
2152 -- Generates the entity name in upper case
2154 Get_Name_String (Chars (Ent));
2156 Store_String_Chars (Name_Buffer (1 .. Name_Len));
2158 end Internal_Full_Qualified_Name;
2160 -- Start of processing for Full_Qualified_Name
2163 Res := Internal_Full_Qualified_Name (E);
2164 Store_String_Char (Get_Char_Code (ASCII.nul));
2166 end Full_Qualified_Name;
2168 -----------------------
2169 -- Gather_Components --
2170 -----------------------
2172 procedure Gather_Components
2174 Comp_List : Node_Id;
2175 Governed_By : List_Id;
2177 Report_Errors : out Boolean)
2181 Discrete_Choice : Node_Id;
2182 Comp_Item : Node_Id;
2184 Discrim : Entity_Id;
2185 Discrim_Name : Node_Id;
2186 Discrim_Value : Node_Id;
2189 Report_Errors := False;
2191 if No (Comp_List) or else Null_Present (Comp_List) then
2194 elsif Present (Component_Items (Comp_List)) then
2195 Comp_Item := First (Component_Items (Comp_List));
2201 while Present (Comp_Item) loop
2203 -- Skip the tag of a tagged record, as well as all items
2204 -- that are not user components (anonymous types, rep clauses,
2205 -- Parent field, controller field).
2207 if Nkind (Comp_Item) = N_Component_Declaration
2208 and then Chars (Defining_Identifier (Comp_Item)) /= Name_uTag
2209 and then Chars (Defining_Identifier (Comp_Item)) /= Name_uParent
2210 and then Chars (Defining_Identifier (Comp_Item)) /= Name_uController
2212 Append_Elmt (Defining_Identifier (Comp_Item), Into);
2218 if No (Variant_Part (Comp_List)) then
2221 Discrim_Name := Name (Variant_Part (Comp_List));
2222 Variant := First_Non_Pragma (Variants (Variant_Part (Comp_List)));
2225 -- Look for the discriminant that governs this variant part.
2226 -- The discriminant *must* be in the Governed_By List
2228 Assoc := First (Governed_By);
2229 Find_Constraint : loop
2230 Discrim := First (Choices (Assoc));
2231 exit Find_Constraint when Chars (Discrim_Name) = Chars (Discrim)
2232 or else (Present (Corresponding_Discriminant (Entity (Discrim)))
2234 Chars (Corresponding_Discriminant (Entity (Discrim)))
2235 = Chars (Discrim_Name))
2236 or else Chars (Original_Record_Component (Entity (Discrim)))
2237 = Chars (Discrim_Name);
2239 if No (Next (Assoc)) then
2240 if not Is_Constrained (Typ)
2241 and then Is_Derived_Type (Typ)
2242 and then Present (Stored_Constraint (Typ))
2245 -- If the type is a tagged type with inherited discriminants,
2246 -- use the stored constraint on the parent in order to find
2247 -- the values of discriminants that are otherwise hidden by an
2248 -- explicit constraint. Renamed discriminants are handled in
2251 -- If several parent discriminants are renamed by a single
2252 -- discriminant of the derived type, the call to obtain the
2253 -- Corresponding_Discriminant field only retrieves the last
2254 -- of them. We recover the constraint on the others from the
2255 -- Stored_Constraint as well.
2262 D := First_Discriminant (Etype (Typ));
2263 C := First_Elmt (Stored_Constraint (Typ));
2266 and then Present (C)
2268 if Chars (Discrim_Name) = Chars (D) then
2269 if Is_Entity_Name (Node (C))
2270 and then Entity (Node (C)) = Entity (Discrim)
2272 -- D is renamed by Discrim, whose value is
2279 Make_Component_Association (Sloc (Typ),
2281 (New_Occurrence_Of (D, Sloc (Typ))),
2282 Duplicate_Subexpr_No_Checks (Node (C)));
2284 exit Find_Constraint;
2287 D := Next_Discriminant (D);
2294 if No (Next (Assoc)) then
2295 Error_Msg_NE (" missing value for discriminant&",
2296 First (Governed_By), Discrim_Name);
2297 Report_Errors := True;
2302 end loop Find_Constraint;
2304 Discrim_Value := Expression (Assoc);
2306 if not Is_OK_Static_Expression (Discrim_Value) then
2308 ("value for discriminant & must be static!",
2309 Discrim_Value, Discrim);
2310 Why_Not_Static (Discrim_Value);
2311 Report_Errors := True;
2315 Search_For_Discriminant_Value : declare
2321 UI_Discrim_Value : constant Uint := Expr_Value (Discrim_Value);
2324 Find_Discrete_Value : while Present (Variant) loop
2325 Discrete_Choice := First (Discrete_Choices (Variant));
2326 while Present (Discrete_Choice) loop
2328 exit Find_Discrete_Value when
2329 Nkind (Discrete_Choice) = N_Others_Choice;
2331 Get_Index_Bounds (Discrete_Choice, Low, High);
2333 UI_Low := Expr_Value (Low);
2334 UI_High := Expr_Value (High);
2336 exit Find_Discrete_Value when
2337 UI_Low <= UI_Discrim_Value
2339 UI_High >= UI_Discrim_Value;
2341 Next (Discrete_Choice);
2344 Next_Non_Pragma (Variant);
2345 end loop Find_Discrete_Value;
2346 end Search_For_Discriminant_Value;
2348 if No (Variant) then
2350 ("value of discriminant & is out of range", Discrim_Value, Discrim);
2351 Report_Errors := True;
2355 -- If we have found the corresponding choice, recursively add its
2356 -- components to the Into list.
2358 Gather_Components (Empty,
2359 Component_List (Variant), Governed_By, Into, Report_Errors);
2360 end Gather_Components;
2362 ------------------------
2363 -- Get_Actual_Subtype --
2364 ------------------------
2366 function Get_Actual_Subtype (N : Node_Id) return Entity_Id is
2367 Typ : constant Entity_Id := Etype (N);
2368 Utyp : Entity_Id := Underlying_Type (Typ);
2373 if not Present (Utyp) then
2377 -- If what we have is an identifier that references a subprogram
2378 -- formal, or a variable or constant object, then we get the actual
2379 -- subtype from the referenced entity if one has been built.
2381 if Nkind (N) = N_Identifier
2383 (Is_Formal (Entity (N))
2384 or else Ekind (Entity (N)) = E_Constant
2385 or else Ekind (Entity (N)) = E_Variable)
2386 and then Present (Actual_Subtype (Entity (N)))
2388 return Actual_Subtype (Entity (N));
2390 -- Actual subtype of unchecked union is always itself. We never need
2391 -- the "real" actual subtype. If we did, we couldn't get it anyway
2392 -- because the discriminant is not available. The restrictions on
2393 -- Unchecked_Union are designed to make sure that this is OK.
2395 elsif Is_Unchecked_Union (Utyp) then
2398 -- Here for the unconstrained case, we must find actual subtype
2399 -- No actual subtype is available, so we must build it on the fly.
2401 -- Checking the type, not the underlying type, for constrainedness
2402 -- seems to be necessary. Maybe all the tests should be on the type???
2404 elsif (not Is_Constrained (Typ))
2405 and then (Is_Array_Type (Utyp)
2406 or else (Is_Record_Type (Utyp)
2407 and then Has_Discriminants (Utyp)))
2408 and then not Has_Unknown_Discriminants (Utyp)
2409 and then not (Ekind (Utyp) = E_String_Literal_Subtype)
2411 -- Nothing to do if in default expression
2413 if In_Default_Expression then
2416 elsif Is_Private_Type (Typ)
2417 and then not Has_Discriminants (Typ)
2419 -- If the type has no discriminants, there is no subtype to
2420 -- build, even if the underlying type is discriminated.
2424 -- Else build the actual subtype
2427 Decl := Build_Actual_Subtype (Typ, N);
2428 Atyp := Defining_Identifier (Decl);
2430 -- If Build_Actual_Subtype generated a new declaration then use it
2434 -- The actual subtype is an Itype, so analyze the declaration,
2435 -- but do not attach it to the tree, to get the type defined.
2437 Set_Parent (Decl, N);
2438 Set_Is_Itype (Atyp);
2439 Analyze (Decl, Suppress => All_Checks);
2440 Set_Associated_Node_For_Itype (Atyp, N);
2441 Set_Has_Delayed_Freeze (Atyp, False);
2443 -- We need to freeze the actual subtype immediately. This is
2444 -- needed, because otherwise this Itype will not get frozen
2445 -- at all, and it is always safe to freeze on creation because
2446 -- any associated types must be frozen at this point.
2448 Freeze_Itype (Atyp, N);
2451 -- Otherwise we did not build a declaration, so return original
2458 -- For all remaining cases, the actual subtype is the same as
2459 -- the nominal type.
2464 end Get_Actual_Subtype;
2466 -------------------------------------
2467 -- Get_Actual_Subtype_If_Available --
2468 -------------------------------------
2470 function Get_Actual_Subtype_If_Available (N : Node_Id) return Entity_Id is
2471 Typ : constant Entity_Id := Etype (N);
2474 -- If what we have is an identifier that references a subprogram
2475 -- formal, or a variable or constant object, then we get the actual
2476 -- subtype from the referenced entity if one has been built.
2478 if Nkind (N) = N_Identifier
2480 (Is_Formal (Entity (N))
2481 or else Ekind (Entity (N)) = E_Constant
2482 or else Ekind (Entity (N)) = E_Variable)
2483 and then Present (Actual_Subtype (Entity (N)))
2485 return Actual_Subtype (Entity (N));
2487 -- Otherwise the Etype of N is returned unchanged
2492 end Get_Actual_Subtype_If_Available;
2494 -------------------------------
2495 -- Get_Default_External_Name --
2496 -------------------------------
2498 function Get_Default_External_Name (E : Node_Or_Entity_Id) return Node_Id is
2500 Get_Decoded_Name_String (Chars (E));
2502 if Opt.External_Name_Imp_Casing = Uppercase then
2503 Set_Casing (All_Upper_Case);
2505 Set_Casing (All_Lower_Case);
2509 Make_String_Literal (Sloc (E),
2510 Strval => String_From_Name_Buffer);
2511 end Get_Default_External_Name;
2513 ---------------------------
2514 -- Get_Enum_Lit_From_Pos --
2515 ---------------------------
2517 function Get_Enum_Lit_From_Pos
2520 Loc : Source_Ptr) return Node_Id
2523 P : constant Nat := UI_To_Int (Pos);
2526 -- In the case where the literal is either of type Wide_Character
2527 -- or Character or of a type derived from them, there needs to be
2528 -- some special handling since there is no explicit chain of
2529 -- literals to search. Instead, an N_Character_Literal node is
2530 -- created with the appropriate Char_Code and Chars fields.
2532 if Root_Type (T) = Standard_Character
2533 or else Root_Type (T) = Standard_Wide_Character
2535 Set_Character_Literal_Name (Char_Code (P));
2537 Make_Character_Literal (Loc,
2539 Char_Literal_Value => Char_Code (P));
2541 -- For all other cases, we have a complete table of literals, and
2542 -- we simply iterate through the chain of literal until the one
2543 -- with the desired position value is found.
2547 Lit := First_Literal (Base_Type (T));
2548 for J in 1 .. P loop
2552 return New_Occurrence_Of (Lit, Loc);
2554 end Get_Enum_Lit_From_Pos;
2556 ------------------------
2557 -- Get_Generic_Entity --
2558 ------------------------
2560 function Get_Generic_Entity (N : Node_Id) return Entity_Id is
2561 Ent : constant Entity_Id := Entity (Name (N));
2564 if Present (Renamed_Object (Ent)) then
2565 return Renamed_Object (Ent);
2569 end Get_Generic_Entity;
2571 ----------------------
2572 -- Get_Index_Bounds --
2573 ----------------------
2575 procedure Get_Index_Bounds (N : Node_Id; L, H : out Node_Id) is
2576 Kind : constant Node_Kind := Nkind (N);
2580 if Kind = N_Range then
2582 H := High_Bound (N);
2584 elsif Kind = N_Subtype_Indication then
2585 R := Range_Expression (Constraint (N));
2593 L := Low_Bound (Range_Expression (Constraint (N)));
2594 H := High_Bound (Range_Expression (Constraint (N)));
2597 elsif Is_Entity_Name (N) and then Is_Type (Entity (N)) then
2598 if Error_Posted (Scalar_Range (Entity (N))) then
2602 elsif Nkind (Scalar_Range (Entity (N))) = N_Subtype_Indication then
2603 Get_Index_Bounds (Scalar_Range (Entity (N)), L, H);
2606 L := Low_Bound (Scalar_Range (Entity (N)));
2607 H := High_Bound (Scalar_Range (Entity (N)));
2611 -- N is an expression, indicating a range with one value.
2616 end Get_Index_Bounds;
2618 ------------------------
2619 -- Get_Name_Entity_Id --
2620 ------------------------
2622 function Get_Name_Entity_Id (Id : Name_Id) return Entity_Id is
2624 return Entity_Id (Get_Name_Table_Info (Id));
2625 end Get_Name_Entity_Id;
2627 ---------------------------
2628 -- Get_Referenced_Object --
2629 ---------------------------
2631 function Get_Referenced_Object (N : Node_Id) return Node_Id is
2635 while Is_Entity_Name (R)
2636 and then Present (Renamed_Object (Entity (R)))
2638 R := Renamed_Object (Entity (R));
2642 end Get_Referenced_Object;
2644 -------------------------
2645 -- Get_Subprogram_Body --
2646 -------------------------
2648 function Get_Subprogram_Body (E : Entity_Id) return Node_Id is
2652 Decl := Unit_Declaration_Node (E);
2654 if Nkind (Decl) = N_Subprogram_Body then
2657 else -- Nkind (Decl) = N_Subprogram_Declaration
2659 if Present (Corresponding_Body (Decl)) then
2660 return Unit_Declaration_Node (Corresponding_Body (Decl));
2662 else -- imported subprogram.
2666 end Get_Subprogram_Body;
2668 -----------------------------
2669 -- Get_Task_Body_Procedure --
2670 -----------------------------
2672 function Get_Task_Body_Procedure (E : Entity_Id) return Node_Id is
2674 return Task_Body_Procedure (Declaration_Node (Root_Type (E)));
2675 end Get_Task_Body_Procedure;
2677 --------------------
2678 -- Has_Infinities --
2679 --------------------
2681 function Has_Infinities (E : Entity_Id) return Boolean is
2684 Is_Floating_Point_Type (E)
2685 and then Nkind (Scalar_Range (E)) = N_Range
2686 and then Includes_Infinities (Scalar_Range (E));
2689 ------------------------
2690 -- Has_Null_Extension --
2691 ------------------------
2693 function Has_Null_Extension (T : Entity_Id) return Boolean is
2694 B : constant Entity_Id := Base_Type (T);
2699 if Nkind (Parent (B)) = N_Full_Type_Declaration
2700 and then Present (Record_Extension_Part (Type_Definition (Parent (B))))
2702 Ext := Record_Extension_Part (Type_Definition (Parent (B)));
2704 if Present (Ext) then
2705 if Null_Present (Ext) then
2708 Comps := Component_List (Ext);
2710 -- The null component list is rewritten during analysis to
2711 -- include the parent component. Any other component indicates
2712 -- that the extension was not originally null.
2714 return Null_Present (Comps)
2715 or else No (Next (First (Component_Items (Comps))));
2724 end Has_Null_Extension;
2726 ---------------------------
2727 -- Has_Private_Component --
2728 ---------------------------
2730 function Has_Private_Component (Type_Id : Entity_Id) return Boolean is
2731 Btype : Entity_Id := Base_Type (Type_Id);
2732 Component : Entity_Id;
2735 if Error_Posted (Type_Id)
2736 or else Error_Posted (Btype)
2741 if Is_Class_Wide_Type (Btype) then
2742 Btype := Root_Type (Btype);
2745 if Is_Private_Type (Btype) then
2747 UT : constant Entity_Id := Underlying_Type (Btype);
2751 if No (Full_View (Btype)) then
2752 return not Is_Generic_Type (Btype)
2753 and then not Is_Generic_Type (Root_Type (Btype));
2756 return not Is_Generic_Type (Root_Type (Full_View (Btype)));
2760 return not Is_Frozen (UT) and then Has_Private_Component (UT);
2763 elsif Is_Array_Type (Btype) then
2764 return Has_Private_Component (Component_Type (Btype));
2766 elsif Is_Record_Type (Btype) then
2768 Component := First_Component (Btype);
2769 while Present (Component) loop
2771 if Has_Private_Component (Etype (Component)) then
2775 Next_Component (Component);
2780 elsif Is_Protected_Type (Btype)
2781 and then Present (Corresponding_Record_Type (Btype))
2783 return Has_Private_Component (Corresponding_Record_Type (Btype));
2788 end Has_Private_Component;
2790 --------------------------
2791 -- Has_Tagged_Component --
2792 --------------------------
2794 function Has_Tagged_Component (Typ : Entity_Id) return Boolean is
2798 if Is_Private_Type (Typ)
2799 and then Present (Underlying_Type (Typ))
2801 return Has_Tagged_Component (Underlying_Type (Typ));
2803 elsif Is_Array_Type (Typ) then
2804 return Has_Tagged_Component (Component_Type (Typ));
2806 elsif Is_Tagged_Type (Typ) then
2809 elsif Is_Record_Type (Typ) then
2810 Comp := First_Component (Typ);
2812 while Present (Comp) loop
2813 if Has_Tagged_Component (Etype (Comp)) then
2817 Comp := Next_Component (Typ);
2825 end Has_Tagged_Component;
2831 function In_Instance return Boolean is
2832 S : Entity_Id := Current_Scope;
2836 and then S /= Standard_Standard
2838 if (Ekind (S) = E_Function
2839 or else Ekind (S) = E_Package
2840 or else Ekind (S) = E_Procedure)
2841 and then Is_Generic_Instance (S)
2852 ----------------------
2853 -- In_Instance_Body --
2854 ----------------------
2856 function In_Instance_Body return Boolean is
2857 S : Entity_Id := Current_Scope;
2861 and then S /= Standard_Standard
2863 if (Ekind (S) = E_Function
2864 or else Ekind (S) = E_Procedure)
2865 and then Is_Generic_Instance (S)
2869 elsif Ekind (S) = E_Package
2870 and then In_Package_Body (S)
2871 and then Is_Generic_Instance (S)
2880 end In_Instance_Body;
2882 -----------------------------
2883 -- In_Instance_Not_Visible --
2884 -----------------------------
2886 function In_Instance_Not_Visible return Boolean is
2887 S : Entity_Id := Current_Scope;
2891 and then S /= Standard_Standard
2893 if (Ekind (S) = E_Function
2894 or else Ekind (S) = E_Procedure)
2895 and then Is_Generic_Instance (S)
2899 elsif Ekind (S) = E_Package
2900 and then (In_Package_Body (S) or else In_Private_Part (S))
2901 and then Is_Generic_Instance (S)
2910 end In_Instance_Not_Visible;
2912 ------------------------------
2913 -- In_Instance_Visible_Part --
2914 ------------------------------
2916 function In_Instance_Visible_Part return Boolean is
2917 S : Entity_Id := Current_Scope;
2921 and then S /= Standard_Standard
2923 if Ekind (S) = E_Package
2924 and then Is_Generic_Instance (S)
2925 and then not In_Package_Body (S)
2926 and then not In_Private_Part (S)
2935 end In_Instance_Visible_Part;
2937 ----------------------
2938 -- In_Packiage_Body --
2939 ----------------------
2941 function In_Package_Body return Boolean is
2942 S : Entity_Id := Current_Scope;
2946 and then S /= Standard_Standard
2948 if Ekind (S) = E_Package
2949 and then In_Package_Body (S)
2958 end In_Package_Body;
2960 --------------------------------------
2961 -- In_Subprogram_Or_Concurrent_Unit --
2962 --------------------------------------
2964 function In_Subprogram_Or_Concurrent_Unit return Boolean is
2969 -- Use scope chain to check successively outer scopes
2975 if K in Subprogram_Kind
2976 or else K in Concurrent_Kind
2977 or else K in Generic_Subprogram_Kind
2981 elsif E = Standard_Standard then
2987 end In_Subprogram_Or_Concurrent_Unit;
2989 ---------------------
2990 -- In_Visible_Part --
2991 ---------------------
2993 function In_Visible_Part (Scope_Id : Entity_Id) return Boolean is
2996 Is_Package (Scope_Id)
2997 and then In_Open_Scopes (Scope_Id)
2998 and then not In_Package_Body (Scope_Id)
2999 and then not In_Private_Part (Scope_Id);
3000 end In_Visible_Part;
3002 ---------------------------------
3003 -- Insert_Explicit_Dereference --
3004 ---------------------------------
3006 procedure Insert_Explicit_Dereference (N : Node_Id) is
3007 New_Prefix : constant Node_Id := Relocate_Node (N);
3013 Save_Interps (N, New_Prefix);
3015 Make_Explicit_Dereference (Sloc (N), Prefix => New_Prefix));
3017 Set_Etype (N, Designated_Type (Etype (New_Prefix)));
3019 if Is_Overloaded (New_Prefix) then
3021 -- The deference is also overloaded, and its interpretations are the
3022 -- designated types of the interpretations of the original node.
3024 Set_Etype (N, Any_Type);
3025 Get_First_Interp (New_Prefix, I, It);
3027 while Present (It.Nam) loop
3030 if Is_Access_Type (T) then
3031 Add_One_Interp (N, Designated_Type (T), Designated_Type (T));
3034 Get_Next_Interp (I, It);
3039 end Insert_Explicit_Dereference;
3045 function Is_AAMP_Float (E : Entity_Id) return Boolean is
3047 pragma Assert (Is_Type (E));
3049 return AAMP_On_Target
3050 and then Is_Floating_Point_Type (E)
3051 and then E = Base_Type (E);
3054 -------------------------
3055 -- Is_Actual_Parameter --
3056 -------------------------
3058 function Is_Actual_Parameter (N : Node_Id) return Boolean is
3059 PK : constant Node_Kind := Nkind (Parent (N));
3063 when N_Parameter_Association =>
3064 return N = Explicit_Actual_Parameter (Parent (N));
3066 when N_Function_Call | N_Procedure_Call_Statement =>
3067 return Is_List_Member (N)
3069 List_Containing (N) = Parameter_Associations (Parent (N));
3074 end Is_Actual_Parameter;
3076 ---------------------
3077 -- Is_Aliased_View --
3078 ---------------------
3080 function Is_Aliased_View (Obj : Node_Id) return Boolean is
3084 if Is_Entity_Name (Obj) then
3086 -- Shouldn't we check that we really have an object here?
3087 -- If we do, then a-caldel.adb blows up mysteriously ???
3091 return Is_Aliased (E)
3092 or else (Present (Renamed_Object (E))
3093 and then Is_Aliased_View (Renamed_Object (E)))
3095 or else ((Is_Formal (E)
3096 or else Ekind (E) = E_Generic_In_Out_Parameter
3097 or else Ekind (E) = E_Generic_In_Parameter)
3098 and then Is_Tagged_Type (Etype (E)))
3100 or else ((Ekind (E) = E_Task_Type or else
3101 Ekind (E) = E_Protected_Type)
3102 and then In_Open_Scopes (E))
3104 -- Current instance of type
3106 or else (Is_Type (E) and then E = Current_Scope)
3107 or else (Is_Incomplete_Or_Private_Type (E)
3108 and then Full_View (E) = Current_Scope);
3110 elsif Nkind (Obj) = N_Selected_Component then
3111 return Is_Aliased (Entity (Selector_Name (Obj)));
3113 elsif Nkind (Obj) = N_Indexed_Component then
3114 return Has_Aliased_Components (Etype (Prefix (Obj)))
3116 (Is_Access_Type (Etype (Prefix (Obj)))
3118 Has_Aliased_Components
3119 (Designated_Type (Etype (Prefix (Obj)))));
3121 elsif Nkind (Obj) = N_Unchecked_Type_Conversion
3122 or else Nkind (Obj) = N_Type_Conversion
3124 return Is_Tagged_Type (Etype (Obj))
3125 and then Is_Aliased_View (Expression (Obj));
3127 elsif Nkind (Obj) = N_Explicit_Dereference then
3128 return Nkind (Original_Node (Obj)) /= N_Function_Call;
3133 end Is_Aliased_View;
3135 ----------------------
3136 -- Is_Atomic_Object --
3137 ----------------------
3139 function Is_Atomic_Object (N : Node_Id) return Boolean is
3141 function Object_Has_Atomic_Components (N : Node_Id) return Boolean;
3142 -- Determines if given object has atomic components
3144 function Is_Atomic_Prefix (N : Node_Id) return Boolean;
3145 -- If prefix is an implicit dereference, examine designated type.
3147 function Is_Atomic_Prefix (N : Node_Id) return Boolean is
3149 if Is_Access_Type (Etype (N)) then
3151 Has_Atomic_Components (Designated_Type (Etype (N)));
3153 return Object_Has_Atomic_Components (N);
3155 end Is_Atomic_Prefix;
3157 function Object_Has_Atomic_Components (N : Node_Id) return Boolean is
3159 if Has_Atomic_Components (Etype (N))
3160 or else Is_Atomic (Etype (N))
3164 elsif Is_Entity_Name (N)
3165 and then (Has_Atomic_Components (Entity (N))
3166 or else Is_Atomic (Entity (N)))
3170 elsif Nkind (N) = N_Indexed_Component
3171 or else Nkind (N) = N_Selected_Component
3173 return Is_Atomic_Prefix (Prefix (N));
3178 end Object_Has_Atomic_Components;
3180 -- Start of processing for Is_Atomic_Object
3183 if Is_Atomic (Etype (N))
3184 or else (Is_Entity_Name (N) and then Is_Atomic (Entity (N)))
3188 elsif Nkind (N) = N_Indexed_Component
3189 or else Nkind (N) = N_Selected_Component
3191 return Is_Atomic_Prefix (Prefix (N));
3196 end Is_Atomic_Object;
3198 ----------------------------------------------
3199 -- Is_Dependent_Component_Of_Mutable_Object --
3200 ----------------------------------------------
3202 function Is_Dependent_Component_Of_Mutable_Object
3203 (Object : Node_Id) return Boolean
3206 Prefix_Type : Entity_Id;
3207 P_Aliased : Boolean := False;
3210 function Has_Dependent_Constraint (Comp : Entity_Id) return Boolean;
3211 -- Returns True if and only if Comp has a constrained subtype
3212 -- that depends on a discriminant.
3214 function Is_Declared_Within_Variant (Comp : Entity_Id) return Boolean;
3215 -- Returns True if and only if Comp is declared within a variant part.
3217 ------------------------------
3218 -- Has_Dependent_Constraint --
3219 ------------------------------
3221 function Has_Dependent_Constraint (Comp : Entity_Id) return Boolean is
3222 Comp_Decl : constant Node_Id := Parent (Comp);
3223 Subt_Indic : constant Node_Id := Subtype_Indication (Comp_Decl);
3228 if Nkind (Subt_Indic) = N_Subtype_Indication then
3229 Constr := Constraint (Subt_Indic);
3231 if Nkind (Constr) = N_Index_Or_Discriminant_Constraint then
3232 Assn := First (Constraints (Constr));
3233 while Present (Assn) loop
3234 case Nkind (Assn) is
3235 when N_Subtype_Indication |
3239 if Depends_On_Discriminant (Assn) then
3243 when N_Discriminant_Association =>
3244 if Depends_On_Discriminant (Expression (Assn)) then
3259 end Has_Dependent_Constraint;
3261 --------------------------------
3262 -- Is_Declared_Within_Variant --
3263 --------------------------------
3265 function Is_Declared_Within_Variant (Comp : Entity_Id) return Boolean is
3266 Comp_Decl : constant Node_Id := Parent (Comp);
3267 Comp_List : constant Node_Id := Parent (Comp_Decl);
3270 return Nkind (Parent (Comp_List)) = N_Variant;
3271 end Is_Declared_Within_Variant;
3273 -- Start of processing for Is_Dependent_Component_Of_Mutable_Object
3276 if Is_Variable (Object) then
3278 if Nkind (Object) = N_Selected_Component then
3279 P := Prefix (Object);
3280 Prefix_Type := Etype (P);
3282 if Is_Entity_Name (P) then
3284 if Ekind (Entity (P)) = E_Generic_In_Out_Parameter then
3285 Prefix_Type := Base_Type (Prefix_Type);
3288 if Is_Aliased (Entity (P)) then
3293 -- Check for prefix being an aliased component ???
3297 if Is_Access_Type (Prefix_Type)
3298 or else Nkind (P) = N_Explicit_Dereference
3304 Original_Record_Component (Entity (Selector_Name (Object)));
3306 -- As per AI-0017, the renaming is illegal in a generic body,
3307 -- even if the subtype is indefinite.
3309 if not Is_Constrained (Prefix_Type)
3310 and then (not Is_Indefinite_Subtype (Prefix_Type)
3312 (Is_Generic_Type (Prefix_Type)
3313 and then Ekind (Current_Scope) = E_Generic_Package
3314 and then In_Package_Body (Current_Scope)))
3316 and then (Is_Declared_Within_Variant (Comp)
3317 or else Has_Dependent_Constraint (Comp))
3318 and then not P_Aliased
3324 Is_Dependent_Component_Of_Mutable_Object (Prefix (Object));
3328 elsif Nkind (Object) = N_Indexed_Component
3329 or else Nkind (Object) = N_Slice
3331 return Is_Dependent_Component_Of_Mutable_Object (Prefix (Object));
3336 end Is_Dependent_Component_Of_Mutable_Object;
3338 ---------------------
3339 -- Is_Dereferenced --
3340 ---------------------
3342 function Is_Dereferenced (N : Node_Id) return Boolean is
3343 P : constant Node_Id := Parent (N);
3347 (Nkind (P) = N_Selected_Component
3349 Nkind (P) = N_Explicit_Dereference
3351 Nkind (P) = N_Indexed_Component
3353 Nkind (P) = N_Slice)
3354 and then Prefix (P) = N;
3355 end Is_Dereferenced;
3361 function Is_False (U : Uint) return Boolean is
3366 ---------------------------
3367 -- Is_Fixed_Model_Number --
3368 ---------------------------
3370 function Is_Fixed_Model_Number (U : Ureal; T : Entity_Id) return Boolean is
3371 S : constant Ureal := Small_Value (T);
3372 M : Urealp.Save_Mark;
3377 R := (U = UR_Trunc (U / S) * S);
3380 end Is_Fixed_Model_Number;
3382 -------------------------------
3383 -- Is_Fully_Initialized_Type --
3384 -------------------------------
3386 function Is_Fully_Initialized_Type (Typ : Entity_Id) return Boolean is
3388 if Is_Scalar_Type (Typ) then
3391 elsif Is_Access_Type (Typ) then
3394 elsif Is_Array_Type (Typ) then
3395 if Is_Fully_Initialized_Type (Component_Type (Typ)) then
3399 -- An interesting case, if we have a constrained type one of whose
3400 -- bounds is known to be null, then there are no elements to be
3401 -- initialized, so all the elements are initialized!
3403 if Is_Constrained (Typ) then
3406 Indx_Typ : Entity_Id;
3410 Indx := First_Index (Typ);
3411 while Present (Indx) loop
3413 if Etype (Indx) = Any_Type then
3416 -- If index is a range, use directly.
3418 elsif Nkind (Indx) = N_Range then
3419 Lbd := Low_Bound (Indx);
3420 Hbd := High_Bound (Indx);
3423 Indx_Typ := Etype (Indx);
3425 if Is_Private_Type (Indx_Typ) then
3426 Indx_Typ := Full_View (Indx_Typ);
3429 if No (Indx_Typ) then
3432 Lbd := Type_Low_Bound (Indx_Typ);
3433 Hbd := Type_High_Bound (Indx_Typ);
3437 if Compile_Time_Known_Value (Lbd)
3438 and then Compile_Time_Known_Value (Hbd)
3440 if Expr_Value (Hbd) < Expr_Value (Lbd) then
3450 -- If no null indexes, then type is not fully initialized
3456 elsif Is_Record_Type (Typ) then
3457 if Has_Discriminants (Typ)
3459 Present (Discriminant_Default_Value (First_Discriminant (Typ)))
3460 and then Is_Fully_Initialized_Variant (Typ)
3465 -- Controlled records are considered to be fully initialized if
3466 -- there is a user defined Initialize routine. This may not be
3467 -- entirely correct, but as the spec notes, we are guessing here
3468 -- what is best from the point of view of issuing warnings.
3470 if Is_Controlled (Typ) then
3472 Utyp : constant Entity_Id := Underlying_Type (Typ);
3475 if Present (Utyp) then
3477 Init : constant Entity_Id :=
3479 (Underlying_Type (Typ), Name_Initialize));
3483 and then Comes_From_Source (Init)
3485 Is_Predefined_File_Name
3486 (File_Name (Get_Source_File_Index (Sloc (Init))))
3490 elsif Has_Null_Extension (Typ)
3492 Is_Fully_Initialized_Type
3493 (Etype (Base_Type (Typ)))
3502 -- Otherwise see if all record components are initialized
3508 Ent := First_Entity (Typ);
3510 while Present (Ent) loop
3511 if Chars (Ent) = Name_uController then
3514 elsif Ekind (Ent) = E_Component
3515 and then (No (Parent (Ent))
3516 or else No (Expression (Parent (Ent))))
3517 and then not Is_Fully_Initialized_Type (Etype (Ent))
3526 -- No uninitialized components, so type is fully initialized.
3527 -- Note that this catches the case of no components as well.
3531 elsif Is_Concurrent_Type (Typ) then
3534 elsif Is_Private_Type (Typ) then
3536 U : constant Entity_Id := Underlying_Type (Typ);
3542 return Is_Fully_Initialized_Type (U);
3549 end Is_Fully_Initialized_Type;
3551 ----------------------------------
3552 -- Is_Fully_Initialized_Variant --
3553 ----------------------------------
3555 function Is_Fully_Initialized_Variant (Typ : Entity_Id) return Boolean is
3556 Loc : constant Source_Ptr := Sloc (Typ);
3557 Comp_Elmt : Elmt_Id;
3559 Comp_List : Node_Id;
3561 Discr_Val : Node_Id;
3562 Constraints : List_Id := New_List;
3563 Components : Elist_Id := New_Elmt_List;
3564 Report_Errors : Boolean;
3567 if Serious_Errors_Detected > 0 then
3571 if Is_Record_Type (Typ)
3572 and then Nkind (Parent (Typ)) = N_Full_Type_Declaration
3573 and then Nkind (Type_Definition (Parent (Typ))) = N_Record_Definition
3575 Comp_List := Component_List (Type_Definition (Parent (Typ)));
3576 Discr := First_Discriminant (Typ);
3578 while Present (Discr) loop
3579 if Nkind (Parent (Discr)) = N_Discriminant_Specification then
3580 Discr_Val := Expression (Parent (Discr));
3581 if not Is_OK_Static_Expression (Discr_Val) then
3584 Append_To (Constraints,
3585 Make_Component_Association (Loc,
3586 Choices => New_List (New_Occurrence_Of (Discr, Loc)),
3587 Expression => New_Copy (Discr_Val)));
3594 Next_Discriminant (Discr);
3599 Comp_List => Comp_List,
3600 Governed_By => Constraints,
3602 Report_Errors => Report_Errors);
3604 -- Check that each component present is fully initialized.
3606 Comp_Elmt := First_Elmt (Components);
3608 while Present (Comp_Elmt) loop
3609 Comp_Id := Node (Comp_Elmt);
3611 if Ekind (Comp_Id) = E_Component
3612 and then (No (Parent (Comp_Id))
3613 or else No (Expression (Parent (Comp_Id))))
3614 and then not Is_Fully_Initialized_Type (Etype (Comp_Id))
3619 Next_Elmt (Comp_Elmt);
3624 elsif Is_Private_Type (Typ) then
3626 U : constant Entity_Id := Underlying_Type (Typ);
3632 return Is_Fully_Initialized_Variant (U);
3638 end Is_Fully_Initialized_Variant;
3640 ----------------------------
3641 -- Is_Inherited_Operation --
3642 ----------------------------
3644 function Is_Inherited_Operation (E : Entity_Id) return Boolean is
3645 Kind : constant Node_Kind := Nkind (Parent (E));
3648 pragma Assert (Is_Overloadable (E));
3649 return Kind = N_Full_Type_Declaration
3650 or else Kind = N_Private_Extension_Declaration
3651 or else Kind = N_Subtype_Declaration
3652 or else (Ekind (E) = E_Enumeration_Literal
3653 and then Is_Derived_Type (Etype (E)));
3654 end Is_Inherited_Operation;
3656 -----------------------------
3657 -- Is_Library_Level_Entity --
3658 -----------------------------
3660 function Is_Library_Level_Entity (E : Entity_Id) return Boolean is
3662 -- The following is a small optimization, and it also handles
3663 -- properly discriminals, which in task bodies might appear in
3664 -- expressions before the corresponding procedure has been
3665 -- created, and which therefore do not have an assigned scope.
3667 if Ekind (E) in Formal_Kind then
3671 -- Normal test is simply that the enclosing dynamic scope is Standard
3673 return Enclosing_Dynamic_Scope (E) = Standard_Standard;
3674 end Is_Library_Level_Entity;
3676 ---------------------------------
3677 -- Is_Local_Variable_Reference --
3678 ---------------------------------
3680 function Is_Local_Variable_Reference (Expr : Node_Id) return Boolean is
3682 if not Is_Entity_Name (Expr) then
3687 Ent : constant Entity_Id := Entity (Expr);
3688 Sub : constant Entity_Id := Enclosing_Subprogram (Ent);
3691 if Ekind (Ent) /= E_Variable
3693 Ekind (Ent) /= E_In_Out_Parameter
3698 return Present (Sub) and then Sub = Current_Subprogram;
3702 end Is_Local_Variable_Reference;
3708 function Is_Lvalue (N : Node_Id) return Boolean is
3709 P : constant Node_Id := Parent (N);
3714 -- Test left side of assignment
3716 when N_Assignment_Statement =>
3717 return N = Name (P);
3719 -- Test prefix of component or attribute
3721 when N_Attribute_Reference |
3723 N_Explicit_Dereference |
3724 N_Indexed_Component |
3726 N_Selected_Component |
3728 return N = Prefix (P);
3730 -- Test subprogram parameter (we really should check the
3731 -- parameter mode, but it is not worth the trouble)
3733 when N_Function_Call |
3734 N_Procedure_Call_Statement |
3735 N_Accept_Statement |
3736 N_Parameter_Association =>
3739 -- Test for appearing in a conversion that itself appears
3740 -- in an lvalue context, since this should be an lvalue.
3742 when N_Type_Conversion =>
3743 return Is_Lvalue (P);
3745 -- Test for appearence in object renaming declaration
3747 when N_Object_Renaming_Declaration =>
3750 -- All other references are definitely not Lvalues
3758 -------------------------
3759 -- Is_Object_Reference --
3760 -------------------------
3762 function Is_Object_Reference (N : Node_Id) return Boolean is
3764 if Is_Entity_Name (N) then
3765 return Is_Object (Entity (N));
3769 when N_Indexed_Component | N_Slice =>
3770 return Is_Object_Reference (Prefix (N));
3772 -- In Ada95, a function call is a constant object
3774 when N_Function_Call =>
3777 -- A reference to the stream attribute Input is a function call
3779 when N_Attribute_Reference =>
3780 return Attribute_Name (N) = Name_Input;
3782 when N_Selected_Component =>
3783 return Is_Object_Reference (Selector_Name (N));
3785 when N_Explicit_Dereference =>
3788 -- An unchecked type conversion is considered to be an object if
3789 -- the operand is an object (this construction arises only as a
3790 -- result of expansion activities).
3792 when N_Unchecked_Type_Conversion =>
3799 end Is_Object_Reference;
3801 -----------------------------------
3802 -- Is_OK_Variable_For_Out_Formal --
3803 -----------------------------------
3805 function Is_OK_Variable_For_Out_Formal (AV : Node_Id) return Boolean is
3807 Note_Possible_Modification (AV);
3809 -- We must reject parenthesized variable names. The check for
3810 -- Comes_From_Source is present because there are currently
3811 -- cases where the compiler violates this rule (e.g. passing
3812 -- a task object to its controlled Initialize routine).
3814 if Paren_Count (AV) > 0 and then Comes_From_Source (AV) then
3817 -- A variable is always allowed
3819 elsif Is_Variable (AV) then
3822 -- Unchecked conversions are allowed only if they come from the
3823 -- generated code, which sometimes uses unchecked conversions for
3824 -- out parameters in cases where code generation is unaffected.
3825 -- We tell source unchecked conversions by seeing if they are
3826 -- rewrites of an original UC function call, or of an explicit
3827 -- conversion of a function call.
3829 elsif Nkind (AV) = N_Unchecked_Type_Conversion then
3830 if Nkind (Original_Node (AV)) = N_Function_Call then
3833 elsif Comes_From_Source (AV)
3834 and then Nkind (Original_Node (Expression (AV))) = N_Function_Call
3842 -- Normal type conversions are allowed if argument is a variable
3844 elsif Nkind (AV) = N_Type_Conversion then
3845 if Is_Variable (Expression (AV))
3846 and then Paren_Count (Expression (AV)) = 0
3848 Note_Possible_Modification (Expression (AV));
3851 -- We also allow a non-parenthesized expression that raises
3852 -- constraint error if it rewrites what used to be a variable
3854 elsif Raises_Constraint_Error (Expression (AV))
3855 and then Paren_Count (Expression (AV)) = 0
3856 and then Is_Variable (Original_Node (Expression (AV)))
3860 -- Type conversion of something other than a variable
3866 -- If this node is rewritten, then test the original form, if that is
3867 -- OK, then we consider the rewritten node OK (for example, if the
3868 -- original node is a conversion, then Is_Variable will not be true
3869 -- but we still want to allow the conversion if it converts a variable).
3871 elsif Original_Node (AV) /= AV then
3872 return Is_OK_Variable_For_Out_Formal (Original_Node (AV));
3874 -- All other non-variables are rejected
3879 end Is_OK_Variable_For_Out_Formal;
3881 -----------------------------------
3882 -- Is_Partially_Initialized_Type --
3883 -----------------------------------
3885 function Is_Partially_Initialized_Type (Typ : Entity_Id) return Boolean is
3887 if Is_Scalar_Type (Typ) then
3890 elsif Is_Access_Type (Typ) then
3893 elsif Is_Array_Type (Typ) then
3895 -- If component type is partially initialized, so is array type
3897 if Is_Partially_Initialized_Type (Component_Type (Typ)) then
3900 -- Otherwise we are only partially initialized if we are fully
3901 -- initialized (this is the empty array case, no point in us
3902 -- duplicating that code here).
3905 return Is_Fully_Initialized_Type (Typ);
3908 elsif Is_Record_Type (Typ) then
3910 -- A discriminated type is always partially initialized
3912 if Has_Discriminants (Typ) then
3915 -- A tagged type is always partially initialized
3917 elsif Is_Tagged_Type (Typ) then
3920 -- Case of non-discriminated record
3926 Component_Present : Boolean := False;
3927 -- Set True if at least one component is present. If no
3928 -- components are present, then record type is fully
3929 -- initialized (another odd case, like the null array).
3932 -- Loop through components
3934 Ent := First_Entity (Typ);
3935 while Present (Ent) loop
3936 if Ekind (Ent) = E_Component then
3937 Component_Present := True;
3939 -- If a component has an initialization expression then
3940 -- the enclosing record type is partially initialized
3942 if Present (Parent (Ent))
3943 and then Present (Expression (Parent (Ent)))
3947 -- If a component is of a type which is itself partially
3948 -- initialized, then the enclosing record type is also.
3950 elsif Is_Partially_Initialized_Type (Etype (Ent)) then
3958 -- No initialized components found. If we found any components
3959 -- they were all uninitialized so the result is false.
3961 if Component_Present then
3964 -- But if we found no components, then all the components are
3965 -- initialized so we consider the type to be initialized.
3973 -- Concurrent types are always fully initialized
3975 elsif Is_Concurrent_Type (Typ) then
3978 -- For a private type, go to underlying type. If there is no underlying
3979 -- type then just assume this partially initialized. Not clear if this
3980 -- can happen in a non-error case, but no harm in testing for this.
3982 elsif Is_Private_Type (Typ) then
3984 U : constant Entity_Id := Underlying_Type (Typ);
3990 return Is_Partially_Initialized_Type (U);
3994 -- For any other type (are there any?) assume partially initialized
3999 end Is_Partially_Initialized_Type;
4001 -----------------------------
4002 -- Is_RCI_Pkg_Spec_Or_Body --
4003 -----------------------------
4005 function Is_RCI_Pkg_Spec_Or_Body (Cunit : Node_Id) return Boolean is
4007 function Is_RCI_Pkg_Decl_Cunit (Cunit : Node_Id) return Boolean;
4008 -- Return True if the unit of Cunit is an RCI package declaration
4010 ---------------------------
4011 -- Is_RCI_Pkg_Decl_Cunit --
4012 ---------------------------
4014 function Is_RCI_Pkg_Decl_Cunit (Cunit : Node_Id) return Boolean is
4015 The_Unit : constant Node_Id := Unit (Cunit);
4018 if Nkind (The_Unit) /= N_Package_Declaration then
4021 return Is_Remote_Call_Interface (Defining_Entity (The_Unit));
4022 end Is_RCI_Pkg_Decl_Cunit;
4024 -- Start of processing for Is_RCI_Pkg_Spec_Or_Body
4027 return Is_RCI_Pkg_Decl_Cunit (Cunit)
4029 (Nkind (Unit (Cunit)) = N_Package_Body
4030 and then Is_RCI_Pkg_Decl_Cunit (Library_Unit (Cunit)));
4031 end Is_RCI_Pkg_Spec_Or_Body;
4033 -----------------------------------------
4034 -- Is_Remote_Access_To_Class_Wide_Type --
4035 -----------------------------------------
4037 function Is_Remote_Access_To_Class_Wide_Type
4038 (E : Entity_Id) return Boolean
4042 function Comes_From_Limited_Private_Type_Declaration
4045 -- Check that the type is declared by a limited type declaration,
4046 -- or else is derived from a Remote_Type ancestor through private
4049 -------------------------------------------------
4050 -- Comes_From_Limited_Private_Type_Declaration --
4051 -------------------------------------------------
4053 function Comes_From_Limited_Private_Type_Declaration (E : in Entity_Id)
4056 N : constant Node_Id := Declaration_Node (E);
4058 if Nkind (N) = N_Private_Type_Declaration
4059 and then Limited_Present (N)
4064 if Nkind (N) = N_Private_Extension_Declaration then
4066 Comes_From_Limited_Private_Type_Declaration (Etype (E))
4068 (Is_Remote_Types (Etype (E))
4069 and then Is_Limited_Record (Etype (E))
4070 and then Has_Private_Declaration (Etype (E)));
4074 end Comes_From_Limited_Private_Type_Declaration;
4076 -- Start of processing for Is_Remote_Access_To_Class_Wide_Type
4079 if not (Is_Remote_Call_Interface (E)
4080 or else Is_Remote_Types (E))
4081 or else Ekind (E) /= E_General_Access_Type
4086 D := Designated_Type (E);
4088 if Ekind (D) /= E_Class_Wide_Type then
4092 return Comes_From_Limited_Private_Type_Declaration
4093 (Defining_Identifier (Parent (D)));
4094 end Is_Remote_Access_To_Class_Wide_Type;
4096 -----------------------------------------
4097 -- Is_Remote_Access_To_Subprogram_Type --
4098 -----------------------------------------
4100 function Is_Remote_Access_To_Subprogram_Type
4101 (E : Entity_Id) return Boolean
4104 return (Ekind (E) = E_Access_Subprogram_Type
4105 or else (Ekind (E) = E_Record_Type
4106 and then Present (Corresponding_Remote_Type (E))))
4107 and then (Is_Remote_Call_Interface (E)
4108 or else Is_Remote_Types (E));
4109 end Is_Remote_Access_To_Subprogram_Type;
4111 --------------------
4112 -- Is_Remote_Call --
4113 --------------------
4115 function Is_Remote_Call (N : Node_Id) return Boolean is
4117 if Nkind (N) /= N_Procedure_Call_Statement
4118 and then Nkind (N) /= N_Function_Call
4120 -- An entry call cannot be remote
4124 elsif Nkind (Name (N)) in N_Has_Entity
4125 and then Is_Remote_Call_Interface (Entity (Name (N)))
4127 -- A subprogram declared in the spec of a RCI package is remote
4131 elsif Nkind (Name (N)) = N_Explicit_Dereference
4132 and then Is_Remote_Access_To_Subprogram_Type
4133 (Etype (Prefix (Name (N))))
4135 -- The dereference of a RAS is a remote call
4139 elsif Present (Controlling_Argument (N))
4140 and then Is_Remote_Access_To_Class_Wide_Type
4141 (Etype (Controlling_Argument (N)))
4143 -- Any primitive operation call with a controlling argument of
4144 -- a RACW type is a remote call.
4149 -- All other calls are local calls
4154 ----------------------
4155 -- Is_Selector_Name --
4156 ----------------------
4158 function Is_Selector_Name (N : Node_Id) return Boolean is
4161 if not Is_List_Member (N) then
4163 P : constant Node_Id := Parent (N);
4164 K : constant Node_Kind := Nkind (P);
4168 (K = N_Expanded_Name or else
4169 K = N_Generic_Association or else
4170 K = N_Parameter_Association or else
4171 K = N_Selected_Component)
4172 and then Selector_Name (P) = N;
4177 L : constant List_Id := List_Containing (N);
4178 P : constant Node_Id := Parent (L);
4181 return (Nkind (P) = N_Discriminant_Association
4182 and then Selector_Names (P) = L)
4184 (Nkind (P) = N_Component_Association
4185 and then Choices (P) = L);
4188 end Is_Selector_Name;
4194 function Is_Statement (N : Node_Id) return Boolean is
4197 Nkind (N) in N_Statement_Other_Than_Procedure_Call
4198 or else Nkind (N) = N_Procedure_Call_Statement;
4205 function Is_Transfer (N : Node_Id) return Boolean is
4206 Kind : constant Node_Kind := Nkind (N);
4209 if Kind = N_Return_Statement
4211 Kind = N_Goto_Statement
4213 Kind = N_Raise_Statement
4215 Kind = N_Requeue_Statement
4219 elsif (Kind = N_Exit_Statement or else Kind in N_Raise_xxx_Error)
4220 and then No (Condition (N))
4224 elsif Kind = N_Procedure_Call_Statement
4225 and then Is_Entity_Name (Name (N))
4226 and then Present (Entity (Name (N)))
4227 and then No_Return (Entity (Name (N)))
4231 elsif Nkind (Original_Node (N)) = N_Raise_Statement then
4243 function Is_True (U : Uint) return Boolean is
4252 function Is_Variable (N : Node_Id) return Boolean is
4254 Orig_Node : constant Node_Id := Original_Node (N);
4255 -- We do the test on the original node, since this is basically a
4256 -- test of syntactic categories, so it must not be disturbed by
4257 -- whatever rewriting might have occurred. For example, an aggregate,
4258 -- which is certainly NOT a variable, could be turned into a variable
4261 function In_Protected_Function (E : Entity_Id) return Boolean;
4262 -- Within a protected function, the private components of the
4263 -- enclosing protected type are constants. A function nested within
4264 -- a (protected) procedure is not itself protected.
4266 function Is_Variable_Prefix (P : Node_Id) return Boolean;
4267 -- Prefixes can involve implicit dereferences, in which case we
4268 -- must test for the case of a reference of a constant access
4269 -- type, which can never be a variable.
4271 ---------------------------
4272 -- In_Protected_Function --
4273 ---------------------------
4275 function In_Protected_Function (E : Entity_Id) return Boolean is
4276 Prot : constant Entity_Id := Scope (E);
4280 if not Is_Protected_Type (Prot) then
4285 while Present (S) and then S /= Prot loop
4287 if Ekind (S) = E_Function
4288 and then Scope (S) = Prot
4298 end In_Protected_Function;
4300 ------------------------
4301 -- Is_Variable_Prefix --
4302 ------------------------
4304 function Is_Variable_Prefix (P : Node_Id) return Boolean is
4306 if Is_Access_Type (Etype (P)) then
4307 return not Is_Access_Constant (Root_Type (Etype (P)));
4309 return Is_Variable (P);
4311 end Is_Variable_Prefix;
4313 -- Start of processing for Is_Variable
4316 -- Definitely OK if Assignment_OK is set. Since this is something that
4317 -- only gets set for expanded nodes, the test is on N, not Orig_Node.
4319 if Nkind (N) in N_Subexpr and then Assignment_OK (N) then
4322 -- Normally we go to the original node, but there is one exception
4323 -- where we use the rewritten node, namely when it is an explicit
4324 -- dereference. The generated code may rewrite a prefix which is an
4325 -- access type with an explicit dereference. The dereference is a
4326 -- variable, even though the original node may not be (since it could
4327 -- be a constant of the access type).
4329 elsif Nkind (N) = N_Explicit_Dereference
4330 and then Nkind (Orig_Node) /= N_Explicit_Dereference
4331 and then Is_Access_Type (Etype (Orig_Node))
4333 return Is_Variable_Prefix (Original_Node (Prefix (N)));
4335 -- All remaining checks use the original node
4337 elsif Is_Entity_Name (Orig_Node) then
4339 E : constant Entity_Id := Entity (Orig_Node);
4340 K : constant Entity_Kind := Ekind (E);
4343 return (K = E_Variable
4344 and then Nkind (Parent (E)) /= N_Exception_Handler)
4345 or else (K = E_Component
4346 and then not In_Protected_Function (E))
4347 or else K = E_Out_Parameter
4348 or else K = E_In_Out_Parameter
4349 or else K = E_Generic_In_Out_Parameter
4351 -- Current instance of type:
4353 or else (Is_Type (E) and then In_Open_Scopes (E))
4354 or else (Is_Incomplete_Or_Private_Type (E)
4355 and then In_Open_Scopes (Full_View (E)));
4359 case Nkind (Orig_Node) is
4360 when N_Indexed_Component | N_Slice =>
4361 return Is_Variable_Prefix (Prefix (Orig_Node));
4363 when N_Selected_Component =>
4364 return Is_Variable_Prefix (Prefix (Orig_Node))
4365 and then Is_Variable (Selector_Name (Orig_Node));
4367 -- For an explicit dereference, the type of the prefix cannot
4368 -- be an access to constant or an access to subprogram.
4370 when N_Explicit_Dereference =>
4372 Typ : constant Entity_Id := Etype (Prefix (Orig_Node));
4375 return Is_Access_Type (Typ)
4376 and then not Is_Access_Constant (Root_Type (Typ))
4377 and then Ekind (Typ) /= E_Access_Subprogram_Type;
4380 -- The type conversion is the case where we do not deal with the
4381 -- context dependent special case of an actual parameter. Thus
4382 -- the type conversion is only considered a variable for the
4383 -- purposes of this routine if the target type is tagged. However,
4384 -- a type conversion is considered to be a variable if it does not
4385 -- come from source (this deals for example with the conversions
4386 -- of expressions to their actual subtypes).
4388 when N_Type_Conversion =>
4389 return Is_Variable (Expression (Orig_Node))
4391 (not Comes_From_Source (Orig_Node)
4393 (Is_Tagged_Type (Etype (Subtype_Mark (Orig_Node)))
4395 Is_Tagged_Type (Etype (Expression (Orig_Node)))));
4397 -- GNAT allows an unchecked type conversion as a variable. This
4398 -- only affects the generation of internal expanded code, since
4399 -- calls to instantiations of Unchecked_Conversion are never
4400 -- considered variables (since they are function calls).
4401 -- This is also true for expression actions.
4403 when N_Unchecked_Type_Conversion =>
4404 return Is_Variable (Expression (Orig_Node));
4412 ------------------------
4413 -- Is_Volatile_Object --
4414 ------------------------
4416 function Is_Volatile_Object (N : Node_Id) return Boolean is
4418 function Object_Has_Volatile_Components (N : Node_Id) return Boolean;
4419 -- Determines if given object has volatile components
4421 function Is_Volatile_Prefix (N : Node_Id) return Boolean;
4422 -- If prefix is an implicit dereference, examine designated type.
4424 ------------------------
4425 -- Is_Volatile_Prefix --
4426 ------------------------
4428 function Is_Volatile_Prefix (N : Node_Id) return Boolean is
4429 Typ : constant Entity_Id := Etype (N);
4432 if Is_Access_Type (Typ) then
4434 Dtyp : constant Entity_Id := Designated_Type (Typ);
4437 return Is_Volatile (Dtyp)
4438 or else Has_Volatile_Components (Dtyp);
4442 return Object_Has_Volatile_Components (N);
4444 end Is_Volatile_Prefix;
4446 ------------------------------------
4447 -- Object_Has_Volatile_Components --
4448 ------------------------------------
4450 function Object_Has_Volatile_Components (N : Node_Id) return Boolean is
4451 Typ : constant Entity_Id := Etype (N);
4454 if Is_Volatile (Typ)
4455 or else Has_Volatile_Components (Typ)
4459 elsif Is_Entity_Name (N)
4460 and then (Has_Volatile_Components (Entity (N))
4461 or else Is_Volatile (Entity (N)))
4465 elsif Nkind (N) = N_Indexed_Component
4466 or else Nkind (N) = N_Selected_Component
4468 return Is_Volatile_Prefix (Prefix (N));
4473 end Object_Has_Volatile_Components;
4475 -- Start of processing for Is_Volatile_Object
4478 if Is_Volatile (Etype (N))
4479 or else (Is_Entity_Name (N) and then Is_Volatile (Entity (N)))
4483 elsif Nkind (N) = N_Indexed_Component
4484 or else Nkind (N) = N_Selected_Component
4486 return Is_Volatile_Prefix (Prefix (N));
4491 end Is_Volatile_Object;
4493 -------------------------
4494 -- Kill_Current_Values --
4495 -------------------------
4497 procedure Kill_Current_Values is
4500 procedure Kill_Current_Values_For_Entity_Chain (E : Entity_Id);
4501 -- Clear current value for entity E and all entities chained to E
4503 -------------------------------------------
4504 -- Kill_Current_Values_For_Entity_Chain --
4505 -------------------------------------------
4507 procedure Kill_Current_Values_For_Entity_Chain (E : Entity_Id) is
4512 while Present (Ent) loop
4513 if Is_Object (Ent) then
4514 Set_Current_Value (Ent, Empty);
4516 if not Can_Never_Be_Null (Ent) then
4517 Set_Is_Known_Non_Null (Ent, False);
4523 end Kill_Current_Values_For_Entity_Chain;
4525 -- Start of processing for Kill_Current_Values
4528 -- Kill all saved checks, a special case of killing saved values
4532 -- Loop through relevant scopes, which includes the current scope and
4533 -- any parent scopes if the current scope is a block or a package.
4538 -- Clear current values of all entities in current scope
4540 Kill_Current_Values_For_Entity_Chain (First_Entity (S));
4542 -- If scope is a package, also clear current values of all
4543 -- private entities in the scope.
4545 if Ekind (S) = E_Package
4547 Ekind (S) = E_Generic_Package
4549 Is_Concurrent_Type (S)
4551 Kill_Current_Values_For_Entity_Chain (First_Private_Entity (S));
4554 -- If this is a block or nested package, deal with parent
4556 if Ekind (S) = E_Block
4557 or else (Ekind (S) = E_Package
4558 and then not Is_Library_Level_Entity (S))
4564 end loop Scope_Loop;
4565 end Kill_Current_Values;
4567 --------------------------
4568 -- Kill_Size_Check_Code --
4569 --------------------------
4571 procedure Kill_Size_Check_Code (E : Entity_Id) is
4573 if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
4574 and then Present (Size_Check_Code (E))
4576 Remove (Size_Check_Code (E));
4577 Set_Size_Check_Code (E, Empty);
4579 end Kill_Size_Check_Code;
4581 -------------------------
4582 -- New_External_Entity --
4583 -------------------------
4585 function New_External_Entity
4586 (Kind : Entity_Kind;
4587 Scope_Id : Entity_Id;
4588 Sloc_Value : Source_Ptr;
4589 Related_Id : Entity_Id;
4591 Suffix_Index : Nat := 0;
4592 Prefix : Character := ' ') return Entity_Id
4594 N : constant Entity_Id :=
4595 Make_Defining_Identifier (Sloc_Value,
4597 (Chars (Related_Id), Suffix, Suffix_Index, Prefix));
4600 Set_Ekind (N, Kind);
4601 Set_Is_Internal (N, True);
4602 Append_Entity (N, Scope_Id);
4603 Set_Public_Status (N);
4605 if Kind in Type_Kind then
4606 Init_Size_Align (N);
4610 end New_External_Entity;
4612 -------------------------
4613 -- New_Internal_Entity --
4614 -------------------------
4616 function New_Internal_Entity
4617 (Kind : Entity_Kind;
4618 Scope_Id : Entity_Id;
4619 Sloc_Value : Source_Ptr;
4620 Id_Char : Character) return Entity_Id
4622 N : constant Entity_Id :=
4623 Make_Defining_Identifier (Sloc_Value, New_Internal_Name (Id_Char));
4626 Set_Ekind (N, Kind);
4627 Set_Is_Internal (N, True);
4628 Append_Entity (N, Scope_Id);
4630 if Kind in Type_Kind then
4631 Init_Size_Align (N);
4635 end New_Internal_Entity;
4641 function Next_Actual (Actual_Id : Node_Id) return Node_Id is
4645 -- If we are pointing at a positional parameter, it is a member of
4646 -- a node list (the list of parameters), and the next parameter
4647 -- is the next node on the list, unless we hit a parameter
4648 -- association, in which case we shift to using the chain whose
4649 -- head is the First_Named_Actual in the parent, and then is
4650 -- threaded using the Next_Named_Actual of the Parameter_Association.
4651 -- All this fiddling is because the original node list is in the
4652 -- textual call order, and what we need is the declaration order.
4654 if Is_List_Member (Actual_Id) then
4655 N := Next (Actual_Id);
4657 if Nkind (N) = N_Parameter_Association then
4658 return First_Named_Actual (Parent (Actual_Id));
4664 return Next_Named_Actual (Parent (Actual_Id));
4668 procedure Next_Actual (Actual_Id : in out Node_Id) is
4670 Actual_Id := Next_Actual (Actual_Id);
4673 -----------------------
4674 -- Normalize_Actuals --
4675 -----------------------
4677 -- Chain actuals according to formals of subprogram. If there are
4678 -- no named associations, the chain is simply the list of Parameter
4679 -- Associations, since the order is the same as the declaration order.
4680 -- If there are named associations, then the First_Named_Actual field
4681 -- in the N_Procedure_Call_Statement node or N_Function_Call node
4682 -- points to the Parameter_Association node for the parameter that
4683 -- comes first in declaration order. The remaining named parameters
4684 -- are then chained in declaration order using Next_Named_Actual.
4686 -- This routine also verifies that the number of actuals is compatible
4687 -- with the number and default values of formals, but performs no type
4688 -- checking (type checking is done by the caller).
4690 -- If the matching succeeds, Success is set to True, and the caller
4691 -- proceeds with type-checking. If the match is unsuccessful, then
4692 -- Success is set to False, and the caller attempts a different
4693 -- interpretation, if there is one.
4695 -- If the flag Report is on, the call is not overloaded, and a failure
4696 -- to match can be reported here, rather than in the caller.
4698 procedure Normalize_Actuals
4702 Success : out Boolean)
4704 Actuals : constant List_Id := Parameter_Associations (N);
4705 Actual : Node_Id := Empty;
4707 Last : Node_Id := Empty;
4708 First_Named : Node_Id := Empty;
4711 Formals_To_Match : Integer := 0;
4712 Actuals_To_Match : Integer := 0;
4714 procedure Chain (A : Node_Id);
4715 -- Add named actual at the proper place in the list, using the
4716 -- Next_Named_Actual link.
4718 function Reporting return Boolean;
4719 -- Determines if an error is to be reported. To report an error, we
4720 -- need Report to be True, and also we do not report errors caused
4721 -- by calls to init procs that occur within other init procs. Such
4722 -- errors must always be cascaded errors, since if all the types are
4723 -- declared correctly, the compiler will certainly build decent calls!
4729 procedure Chain (A : Node_Id) is
4733 -- Call node points to first actual in list.
4735 Set_First_Named_Actual (N, Explicit_Actual_Parameter (A));
4738 Set_Next_Named_Actual (Last, Explicit_Actual_Parameter (A));
4742 Set_Next_Named_Actual (Last, Empty);
4749 function Reporting return Boolean is
4754 elsif not Within_Init_Proc then
4757 elsif Is_Init_Proc (Entity (Name (N))) then
4765 -- Start of processing for Normalize_Actuals
4768 if Is_Access_Type (S) then
4770 -- The name in the call is a function call that returns an access
4771 -- to subprogram. The designated type has the list of formals.
4773 Formal := First_Formal (Designated_Type (S));
4775 Formal := First_Formal (S);
4778 while Present (Formal) loop
4779 Formals_To_Match := Formals_To_Match + 1;
4780 Next_Formal (Formal);
4783 -- Find if there is a named association, and verify that no positional
4784 -- associations appear after named ones.
4786 if Present (Actuals) then
4787 Actual := First (Actuals);
4790 while Present (Actual)
4791 and then Nkind (Actual) /= N_Parameter_Association
4793 Actuals_To_Match := Actuals_To_Match + 1;
4797 if No (Actual) and Actuals_To_Match = Formals_To_Match then
4799 -- Most common case: positional notation, no defaults
4804 elsif Actuals_To_Match > Formals_To_Match then
4806 -- Too many actuals: will not work.
4809 if Is_Entity_Name (Name (N)) then
4810 Error_Msg_N ("too many arguments in call to&", Name (N));
4812 Error_Msg_N ("too many arguments in call", N);
4820 First_Named := Actual;
4822 while Present (Actual) loop
4823 if Nkind (Actual) /= N_Parameter_Association then
4825 ("positional parameters not allowed after named ones", Actual);
4830 Actuals_To_Match := Actuals_To_Match + 1;
4836 if Present (Actuals) then
4837 Actual := First (Actuals);
4840 Formal := First_Formal (S);
4842 while Present (Formal) loop
4844 -- Match the formals in order. If the corresponding actual
4845 -- is positional, nothing to do. Else scan the list of named
4846 -- actuals to find the one with the right name.
4849 and then Nkind (Actual) /= N_Parameter_Association
4852 Actuals_To_Match := Actuals_To_Match - 1;
4853 Formals_To_Match := Formals_To_Match - 1;
4856 -- For named parameters, search the list of actuals to find
4857 -- one that matches the next formal name.
4859 Actual := First_Named;
4862 while Present (Actual) loop
4863 if Chars (Selector_Name (Actual)) = Chars (Formal) then
4866 Actuals_To_Match := Actuals_To_Match - 1;
4867 Formals_To_Match := Formals_To_Match - 1;
4875 if Ekind (Formal) /= E_In_Parameter
4876 or else No (Default_Value (Formal))
4879 if (Comes_From_Source (S)
4880 or else Sloc (S) = Standard_Location)
4881 and then Is_Overloadable (S)
4883 Error_Msg_Name_1 := Chars (S);
4884 Error_Msg_Sloc := Sloc (S);
4886 ("missing argument for parameter & " &
4887 "in call to % declared #", N, Formal);
4889 elsif Is_Overloadable (S) then
4890 Error_Msg_Name_1 := Chars (S);
4892 -- Point to type derivation that
4893 -- generated the operation.
4895 Error_Msg_Sloc := Sloc (Parent (S));
4898 ("missing argument for parameter & " &
4899 "in call to % (inherited) #", N, Formal);
4903 ("missing argument for parameter &", N, Formal);
4911 Formals_To_Match := Formals_To_Match - 1;
4916 Next_Formal (Formal);
4919 if Formals_To_Match = 0 and then Actuals_To_Match = 0 then
4926 -- Find some superfluous named actual that did not get
4927 -- attached to the list of associations.
4929 Actual := First (Actuals);
4931 while Present (Actual) loop
4933 if Nkind (Actual) = N_Parameter_Association
4934 and then Actual /= Last
4935 and then No (Next_Named_Actual (Actual))
4937 Error_Msg_N ("unmatched actual & in call",
4938 Selector_Name (Actual));
4949 end Normalize_Actuals;
4951 --------------------------------
4952 -- Note_Possible_Modification --
4953 --------------------------------
4955 procedure Note_Possible_Modification (N : Node_Id) is
4959 procedure Set_Ref (E : Entity_Id; N : Node_Id);
4960 -- Internal routine to note modification on entity E by node N
4961 -- Has no effect if entity E does not represent an object.
4967 procedure Set_Ref (E : Entity_Id; N : Node_Id) is
4969 if Is_Object (E) then
4970 if Comes_From_Source (N) then
4971 Set_Never_Set_In_Source (E, False);
4974 Set_Is_True_Constant (E, False);
4975 Set_Current_Value (E, Empty);
4976 Generate_Reference (E, N, 'm');
4979 if not Can_Never_Be_Null (E) then
4980 Set_Is_Known_Non_Null (E, False);
4985 -- Start of processing for Note_Possible_Modification
4988 -- Loop to find referenced entity, if there is one
4992 -- Test for node rewritten as dereference (e.g. accept parameter)
4994 if Nkind (Exp) = N_Explicit_Dereference
4995 and then not Comes_From_Source (Exp)
4997 Exp := Original_Node (Exp);
5000 -- Now look for entity being referenced
5002 if Is_Entity_Name (Exp) then
5003 Ent := Entity (Exp);
5005 if (Ekind (Ent) = E_Variable or else Ekind (Ent) = E_Constant)
5006 and then Present (Renamed_Object (Ent))
5008 Set_Never_Set_In_Source (Ent, False);
5009 Set_Is_True_Constant (Ent, False);
5010 Set_Current_Value (Ent, Empty);
5012 if not Can_Never_Be_Null (Ent) then
5013 Set_Is_Known_Non_Null (Ent, False);
5016 Exp := Renamed_Object (Ent);
5024 elsif Nkind (Exp) = N_Type_Conversion
5025 or else Nkind (Exp) = N_Unchecked_Type_Conversion
5027 Exp := Expression (Exp);
5029 elsif Nkind (Exp) = N_Slice
5030 or else Nkind (Exp) = N_Indexed_Component
5031 or else Nkind (Exp) = N_Selected_Component
5033 Exp := Prefix (Exp);
5039 end Note_Possible_Modification;
5041 -------------------------
5042 -- Object_Access_Level --
5043 -------------------------
5045 function Object_Access_Level (Obj : Node_Id) return Uint is
5048 -- Returns the static accessibility level of the view denoted
5049 -- by Obj. Note that the value returned is the result of a
5050 -- call to Scope_Depth. Only scope depths associated with
5051 -- dynamic scopes can actually be returned. Since only
5052 -- relative levels matter for accessibility checking, the fact
5053 -- that the distance between successive levels of accessibility
5054 -- is not always one is immaterial (invariant: if level(E2) is
5055 -- deeper than level(E1), then Scope_Depth(E1) < Scope_Depth(E2)).
5058 if Is_Entity_Name (Obj) then
5061 -- If E is a type then it denotes a current instance.
5062 -- For this case we add one to the normal accessibility
5063 -- level of the type to ensure that current instances
5064 -- are treated as always being deeper than than the level
5065 -- of any visible named access type (see 3.10.2(21)).
5068 return Type_Access_Level (E) + 1;
5070 elsif Present (Renamed_Object (E)) then
5071 return Object_Access_Level (Renamed_Object (E));
5073 -- Similarly, if E is a component of the current instance of a
5074 -- protected type, any instance of it is assumed to be at a deeper
5075 -- level than the type. For a protected object (whose type is an
5076 -- anonymous protected type) its components are at the same level
5077 -- as the type itself.
5079 elsif not Is_Overloadable (E)
5080 and then Ekind (Scope (E)) = E_Protected_Type
5081 and then Comes_From_Source (Scope (E))
5083 return Type_Access_Level (Scope (E)) + 1;
5086 return Scope_Depth (Enclosing_Dynamic_Scope (E));
5089 elsif Nkind (Obj) = N_Selected_Component then
5090 if Is_Access_Type (Etype (Prefix (Obj))) then
5091 return Type_Access_Level (Etype (Prefix (Obj)));
5093 return Object_Access_Level (Prefix (Obj));
5096 elsif Nkind (Obj) = N_Indexed_Component then
5097 if Is_Access_Type (Etype (Prefix (Obj))) then
5098 return Type_Access_Level (Etype (Prefix (Obj)));
5100 return Object_Access_Level (Prefix (Obj));
5103 elsif Nkind (Obj) = N_Explicit_Dereference then
5105 -- If the prefix is a selected access discriminant then
5106 -- we make a recursive call on the prefix, which will
5107 -- in turn check the level of the prefix object of
5108 -- the selected discriminant.
5110 if Nkind (Prefix (Obj)) = N_Selected_Component
5111 and then Ekind (Etype (Prefix (Obj))) = E_Anonymous_Access_Type
5113 Ekind (Entity (Selector_Name (Prefix (Obj)))) = E_Discriminant
5115 return Object_Access_Level (Prefix (Obj));
5117 return Type_Access_Level (Etype (Prefix (Obj)));
5120 elsif Nkind (Obj) = N_Type_Conversion
5121 or else Nkind (Obj) = N_Unchecked_Type_Conversion
5123 return Object_Access_Level (Expression (Obj));
5125 -- Function results are objects, so we get either the access level
5126 -- of the function or, in the case of an indirect call, the level of
5127 -- of the access-to-subprogram type.
5129 elsif Nkind (Obj) = N_Function_Call then
5130 if Is_Entity_Name (Name (Obj)) then
5131 return Subprogram_Access_Level (Entity (Name (Obj)));
5133 return Type_Access_Level (Etype (Prefix (Name (Obj))));
5136 -- For convenience we handle qualified expressions, even though
5137 -- they aren't technically object names.
5139 elsif Nkind (Obj) = N_Qualified_Expression then
5140 return Object_Access_Level (Expression (Obj));
5142 -- Otherwise return the scope level of Standard.
5143 -- (If there are cases that fall through
5144 -- to this point they will be treated as
5145 -- having global accessibility for now. ???)
5148 return Scope_Depth (Standard_Standard);
5150 end Object_Access_Level;
5152 -----------------------
5153 -- Private_Component --
5154 -----------------------
5156 function Private_Component (Type_Id : Entity_Id) return Entity_Id is
5157 Ancestor : constant Entity_Id := Base_Type (Type_Id);
5159 function Trace_Components
5161 Check : Boolean) return Entity_Id;
5162 -- Recursive function that does the work, and checks against circular
5163 -- definition for each subcomponent type.
5165 ----------------------
5166 -- Trace_Components --
5167 ----------------------
5169 function Trace_Components
5171 Check : Boolean) return Entity_Id
5173 Btype : constant Entity_Id := Base_Type (T);
5174 Component : Entity_Id;
5176 Candidate : Entity_Id := Empty;
5179 if Check and then Btype = Ancestor then
5180 Error_Msg_N ("circular type definition", Type_Id);
5184 if Is_Private_Type (Btype)
5185 and then not Is_Generic_Type (Btype)
5189 elsif Is_Array_Type (Btype) then
5190 return Trace_Components (Component_Type (Btype), True);
5192 elsif Is_Record_Type (Btype) then
5193 Component := First_Entity (Btype);
5194 while Present (Component) loop
5196 -- skip anonymous types generated by constrained components.
5198 if not Is_Type (Component) then
5199 P := Trace_Components (Etype (Component), True);
5202 if P = Any_Type then
5210 Next_Entity (Component);
5218 end Trace_Components;
5220 -- Start of processing for Private_Component
5223 return Trace_Components (Type_Id, False);
5224 end Private_Component;
5226 -----------------------
5227 -- Process_End_Label --
5228 -----------------------
5230 procedure Process_End_Label
5238 Label_Ref : Boolean;
5239 -- Set True if reference to end label itself is required
5242 -- Gets set to the operator symbol or identifier that references
5243 -- the entity Ent. For the child unit case, this is the identifier
5244 -- from the designator. For other cases, this is simply Endl.
5246 procedure Generate_Parent_Ref (N : Node_Id);
5247 -- N is an identifier node that appears as a parent unit reference
5248 -- in the case where Ent is a child unit. This procedure generates
5249 -- an appropriate cross-reference entry.
5251 -------------------------
5252 -- Generate_Parent_Ref --
5253 -------------------------
5255 procedure Generate_Parent_Ref (N : Node_Id) is
5256 Parent_Ent : Entity_Id;
5259 -- Search up scope stack. The reason we do this is that normal
5260 -- visibility analysis would not work for two reasons. First in
5261 -- some subunit cases, the entry for the parent unit may not be
5262 -- visible, and in any case there can be a local entity that
5263 -- hides the scope entity.
5265 Parent_Ent := Current_Scope;
5266 while Present (Parent_Ent) loop
5267 if Chars (Parent_Ent) = Chars (N) then
5269 -- Generate the reference. We do NOT consider this as a
5270 -- reference for unreferenced symbol purposes, but we do
5271 -- force a cross-reference even if the end line does not
5272 -- come from source (the caller already generated the
5273 -- appropriate Typ for this situation).
5276 (Parent_Ent, N, 'r', Set_Ref => False, Force => True);
5277 Style.Check_Identifier (N, Parent_Ent);
5281 Parent_Ent := Scope (Parent_Ent);
5284 -- Fall through means entity was not found -- that's odd, but
5285 -- the appropriate thing is simply to ignore and not generate
5286 -- any cross-reference for this entry.
5289 end Generate_Parent_Ref;
5291 -- Start of processing for Process_End_Label
5294 -- If no node, ignore. This happens in some error situations,
5295 -- and also for some internally generated structures where no
5296 -- end label references are required in any case.
5302 -- Nothing to do if no End_Label, happens for internally generated
5303 -- constructs where we don't want an end label reference anyway.
5304 -- Also nothing to do if Endl is a string literal, which means
5305 -- there was some prior error (bad operator symbol)
5307 Endl := End_Label (N);
5309 if No (Endl) or else Nkind (Endl) = N_String_Literal then
5313 -- Reference node is not in extended main source unit
5315 if not In_Extended_Main_Source_Unit (N) then
5317 -- Generally we do not collect references except for the
5318 -- extended main source unit. The one exception is the 'e'
5319 -- entry for a package spec, where it is useful for a client
5320 -- to have the ending information to define scopes.
5328 -- For this case, we can ignore any parent references,
5329 -- but we need the package name itself for the 'e' entry.
5331 if Nkind (Endl) = N_Designator then
5332 Endl := Identifier (Endl);
5336 -- Reference is in extended main source unit
5341 -- For designator, generate references for the parent entries
5343 if Nkind (Endl) = N_Designator then
5345 -- Generate references for the prefix if the END line comes
5346 -- from source (otherwise we do not need these references)
5348 if Comes_From_Source (Endl) then
5350 while Nkind (Nam) = N_Selected_Component loop
5351 Generate_Parent_Ref (Selector_Name (Nam));
5352 Nam := Prefix (Nam);
5355 Generate_Parent_Ref (Nam);
5358 Endl := Identifier (Endl);
5362 -- If the end label is not for the given entity, then either we have
5363 -- some previous error, or this is a generic instantiation for which
5364 -- we do not need to make a cross-reference in this case anyway. In
5365 -- either case we simply ignore the call.
5367 if Chars (Ent) /= Chars (Endl) then
5371 -- If label was really there, then generate a normal reference
5372 -- and then adjust the location in the end label to point past
5373 -- the name (which should almost always be the semicolon).
5377 if Comes_From_Source (Endl) then
5379 -- If a label reference is required, then do the style check
5380 -- and generate an l-type cross-reference entry for the label
5384 Style.Check_Identifier (Endl, Ent);
5386 Generate_Reference (Ent, Endl, 'l', Set_Ref => False);
5389 -- Set the location to point past the label (normally this will
5390 -- mean the semicolon immediately following the label). This is
5391 -- done for the sake of the 'e' or 't' entry generated below.
5393 Get_Decoded_Name_String (Chars (Endl));
5394 Set_Sloc (Endl, Sloc (Endl) + Source_Ptr (Name_Len));
5397 -- Now generate the e/t reference
5399 Generate_Reference (Ent, Endl, Typ, Set_Ref => False, Force => True);
5401 -- Restore Sloc, in case modified above, since we have an identifier
5402 -- and the normal Sloc should be left set in the tree.
5404 Set_Sloc (Endl, Loc);
5405 end Process_End_Label;
5411 -- We do the conversion to get the value of the real string by using
5412 -- the scanner, see Sinput for details on use of the internal source
5413 -- buffer for scanning internal strings.
5415 function Real_Convert (S : String) return Node_Id is
5416 Save_Src : constant Source_Buffer_Ptr := Source;
5420 Source := Internal_Source_Ptr;
5423 for J in S'Range loop
5424 Source (Source_Ptr (J)) := S (J);
5427 Source (S'Length + 1) := EOF;
5429 if Source (Scan_Ptr) = '-' then
5431 Scan_Ptr := Scan_Ptr + 1;
5439 Set_Realval (Token_Node, UR_Negate (Realval (Token_Node)));
5446 ---------------------
5447 -- Rep_To_Pos_Flag --
5448 ---------------------
5450 function Rep_To_Pos_Flag (E : Entity_Id; Loc : Source_Ptr) return Node_Id is
5452 if Range_Checks_Suppressed (E) then
5453 return New_Occurrence_Of (Standard_False, Loc);
5455 return New_Occurrence_Of (Standard_True, Loc);
5457 end Rep_To_Pos_Flag;
5459 --------------------
5460 -- Require_Entity --
5461 --------------------
5463 procedure Require_Entity (N : Node_Id) is
5465 if Is_Entity_Name (N) and then No (Entity (N)) then
5466 if Total_Errors_Detected /= 0 then
5467 Set_Entity (N, Any_Id);
5469 raise Program_Error;
5474 ------------------------------
5475 -- Requires_Transient_Scope --
5476 ------------------------------
5478 -- A transient scope is required when variable-sized temporaries are
5479 -- allocated in the primary or secondary stack, or when finalization
5480 -- actions must be generated before the next instruction
5482 function Requires_Transient_Scope (Id : Entity_Id) return Boolean is
5483 Typ : constant Entity_Id := Underlying_Type (Id);
5486 -- This is a private type which is not completed yet. This can only
5487 -- happen in a default expression (of a formal parameter or of a
5488 -- record component). Do not expand transient scope in this case
5493 elsif Typ = Standard_Void_Type then
5496 -- The back-end has trouble allocating variable-size temporaries so
5497 -- we generate them in the front-end and need a transient scope to
5498 -- reclaim them properly
5500 elsif not Size_Known_At_Compile_Time (Typ) then
5503 -- Unconstrained discriminated records always require a variable
5504 -- length temporary, since the length may depend on the variant.
5506 elsif Is_Record_Type (Typ)
5507 and then Has_Discriminants (Typ)
5508 and then not Is_Constrained (Typ)
5512 -- Functions returning tagged types may dispatch on result so their
5513 -- returned value is allocated on the secondary stack. Controlled
5514 -- type temporaries need finalization.
5516 elsif Is_Tagged_Type (Typ)
5517 or else Has_Controlled_Component (Typ)
5521 -- Unconstrained array types are returned on the secondary stack
5523 elsif Is_Array_Type (Typ) then
5524 return not Is_Constrained (Typ);
5528 end Requires_Transient_Scope;
5530 --------------------------
5531 -- Reset_Analyzed_Flags --
5532 --------------------------
5534 procedure Reset_Analyzed_Flags (N : Node_Id) is
5536 function Clear_Analyzed
5537 (N : Node_Id) return Traverse_Result;
5538 -- Function used to reset Analyzed flags in tree. Note that we do
5539 -- not reset Analyzed flags in entities, since there is no need to
5540 -- renalalyze entities, and indeed, it is wrong to do so, since it
5541 -- can result in generating auxiliary stuff more than once.
5543 --------------------
5544 -- Clear_Analyzed --
5545 --------------------
5547 function Clear_Analyzed
5548 (N : Node_Id) return Traverse_Result
5551 if not Has_Extension (N) then
5552 Set_Analyzed (N, False);
5558 function Reset_Analyzed is
5559 new Traverse_Func (Clear_Analyzed);
5561 Discard : Traverse_Result;
5562 pragma Warnings (Off, Discard);
5564 -- Start of processing for Reset_Analyzed_Flags
5567 Discard := Reset_Analyzed (N);
5568 end Reset_Analyzed_Flags;
5570 ---------------------------
5571 -- Safe_To_Capture_Value --
5572 ---------------------------
5574 function Safe_To_Capture_Value
5576 Ent : Entity_Id) return Boolean
5579 -- The only entities for which we track constant values are variables,
5580 -- out parameters and in out parameters, so check if we have this case.
5582 if Ekind (Ent) /= E_Variable
5584 Ekind (Ent) /= E_Out_Parameter
5586 Ekind (Ent) /= E_In_Out_Parameter
5591 -- Skip volatile and aliased variables, since funny things might
5592 -- be going on in these cases which we cannot necessarily track.
5594 if Treat_As_Volatile (Ent) or else Is_Aliased (Ent) then
5598 -- OK, all above conditions are met. We also require that the scope
5599 -- of the reference be the same as the scope of the entity, not
5600 -- counting packages and blocks.
5603 E_Scope : constant Entity_Id := Scope (Ent);
5604 R_Scope : Entity_Id;
5607 R_Scope := Current_Scope;
5608 while R_Scope /= Standard_Standard loop
5609 exit when R_Scope = E_Scope;
5611 if Ekind (R_Scope) /= E_Package
5613 Ekind (R_Scope) /= E_Block
5617 R_Scope := Scope (R_Scope);
5622 -- We also require that the reference does not appear in a context
5623 -- where it is not sure to be executed (i.e. a conditional context
5624 -- or an exception handler).
5631 while Present (P) loop
5632 if Nkind (P) = N_If_Statement
5634 Nkind (P) = N_Case_Statement
5636 Nkind (P) = N_Exception_Handler
5638 Nkind (P) = N_Selective_Accept
5640 Nkind (P) = N_Conditional_Entry_Call
5642 Nkind (P) = N_Timed_Entry_Call
5644 Nkind (P) = N_Asynchronous_Select
5653 -- OK, looks safe to set value
5656 end Safe_To_Capture_Value;
5662 function Same_Name (N1, N2 : Node_Id) return Boolean is
5663 K1 : constant Node_Kind := Nkind (N1);
5664 K2 : constant Node_Kind := Nkind (N2);
5667 if (K1 = N_Identifier or else K1 = N_Defining_Identifier)
5668 and then (K2 = N_Identifier or else K2 = N_Defining_Identifier)
5670 return Chars (N1) = Chars (N2);
5672 elsif (K1 = N_Selected_Component or else K1 = N_Expanded_Name)
5673 and then (K2 = N_Selected_Component or else K2 = N_Expanded_Name)
5675 return Same_Name (Selector_Name (N1), Selector_Name (N2))
5676 and then Same_Name (Prefix (N1), Prefix (N2));
5687 function Same_Type (T1, T2 : Entity_Id) return Boolean is
5692 elsif not Is_Constrained (T1)
5693 and then not Is_Constrained (T2)
5694 and then Base_Type (T1) = Base_Type (T2)
5698 -- For now don't bother with case of identical constraints, to be
5699 -- fiddled with later on perhaps (this is only used for optimization
5700 -- purposes, so it is not critical to do a best possible job)
5707 ------------------------
5708 -- Scope_Is_Transient --
5709 ------------------------
5711 function Scope_Is_Transient return Boolean is
5713 return Scope_Stack.Table (Scope_Stack.Last).Is_Transient;
5714 end Scope_Is_Transient;
5720 function Scope_Within (Scope1, Scope2 : Entity_Id) return Boolean is
5725 while Scop /= Standard_Standard loop
5726 Scop := Scope (Scop);
5728 if Scop = Scope2 then
5736 --------------------------
5737 -- Scope_Within_Or_Same --
5738 --------------------------
5740 function Scope_Within_Or_Same (Scope1, Scope2 : Entity_Id) return Boolean is
5745 while Scop /= Standard_Standard loop
5746 if Scop = Scope2 then
5749 Scop := Scope (Scop);
5754 end Scope_Within_Or_Same;
5756 ------------------------
5757 -- Set_Current_Entity --
5758 ------------------------
5760 -- The given entity is to be set as the currently visible definition
5761 -- of its associated name (i.e. the Node_Id associated with its name).
5762 -- All we have to do is to get the name from the identifier, and
5763 -- then set the associated Node_Id to point to the given entity.
5765 procedure Set_Current_Entity (E : Entity_Id) is
5767 Set_Name_Entity_Id (Chars (E), E);
5768 end Set_Current_Entity;
5770 ---------------------------------
5771 -- Set_Entity_With_Style_Check --
5772 ---------------------------------
5774 procedure Set_Entity_With_Style_Check (N : Node_Id; Val : Entity_Id) is
5775 Val_Actual : Entity_Id;
5779 Set_Entity (N, Val);
5782 and then not Suppress_Style_Checks (Val)
5783 and then not In_Instance
5785 if Nkind (N) = N_Identifier then
5788 elsif Nkind (N) = N_Expanded_Name then
5789 Nod := Selector_Name (N);
5797 -- A special situation arises for derived operations, where we want
5798 -- to do the check against the parent (since the Sloc of the derived
5799 -- operation points to the derived type declaration itself).
5801 while not Comes_From_Source (Val_Actual)
5802 and then Nkind (Val_Actual) in N_Entity
5803 and then (Ekind (Val_Actual) = E_Enumeration_Literal
5804 or else Is_Subprogram (Val_Actual)
5805 or else Is_Generic_Subprogram (Val_Actual))
5806 and then Present (Alias (Val_Actual))
5808 Val_Actual := Alias (Val_Actual);
5811 -- Renaming declarations for generic actuals do not come from source,
5812 -- and have a different name from that of the entity they rename, so
5813 -- there is no style check to perform here.
5815 if Chars (Nod) = Chars (Val_Actual) then
5816 Style.Check_Identifier (Nod, Val_Actual);
5820 Set_Entity (N, Val);
5821 end Set_Entity_With_Style_Check;
5823 ------------------------
5824 -- Set_Name_Entity_Id --
5825 ------------------------
5827 procedure Set_Name_Entity_Id (Id : Name_Id; Val : Entity_Id) is
5829 Set_Name_Table_Info (Id, Int (Val));
5830 end Set_Name_Entity_Id;
5832 ---------------------
5833 -- Set_Next_Actual --
5834 ---------------------
5836 procedure Set_Next_Actual (Ass1_Id : Node_Id; Ass2_Id : Node_Id) is
5838 if Nkind (Parent (Ass1_Id)) = N_Parameter_Association then
5839 Set_First_Named_Actual (Parent (Ass1_Id), Ass2_Id);
5841 end Set_Next_Actual;
5843 -----------------------
5844 -- Set_Public_Status --
5845 -----------------------
5847 procedure Set_Public_Status (Id : Entity_Id) is
5848 S : constant Entity_Id := Current_Scope;
5851 if S = Standard_Standard
5852 or else (Is_Public (S)
5853 and then (Ekind (S) = E_Package
5854 or else Is_Record_Type (S)
5855 or else Ekind (S) = E_Void))
5859 -- The bounds of an entry family declaration can generate object
5860 -- declarations that are visible to the back-end, e.g. in the
5861 -- the declaration of a composite type that contains tasks.
5864 and then Is_Concurrent_Type (S)
5865 and then not Has_Completion (S)
5866 and then Nkind (Parent (Id)) = N_Object_Declaration
5870 end Set_Public_Status;
5872 ----------------------------
5873 -- Set_Scope_Is_Transient --
5874 ----------------------------
5876 procedure Set_Scope_Is_Transient (V : Boolean := True) is
5878 Scope_Stack.Table (Scope_Stack.Last).Is_Transient := V;
5879 end Set_Scope_Is_Transient;
5885 procedure Set_Size_Info (T1, T2 : Entity_Id) is
5887 -- We copy Esize, but not RM_Size, since in general RM_Size is
5888 -- subtype specific and does not get inherited by all subtypes.
5890 Set_Esize (T1, Esize (T2));
5891 Set_Has_Biased_Representation (T1, Has_Biased_Representation (T2));
5893 if Is_Discrete_Or_Fixed_Point_Type (T1)
5895 Is_Discrete_Or_Fixed_Point_Type (T2)
5897 Set_Is_Unsigned_Type (T1, Is_Unsigned_Type (T2));
5899 Set_Alignment (T1, Alignment (T2));
5902 --------------------
5903 -- Static_Integer --
5904 --------------------
5906 function Static_Integer (N : Node_Id) return Uint is
5908 Analyze_And_Resolve (N, Any_Integer);
5911 or else Error_Posted (N)
5912 or else Etype (N) = Any_Type
5917 if Is_Static_Expression (N) then
5918 if not Raises_Constraint_Error (N) then
5919 return Expr_Value (N);
5924 elsif Etype (N) = Any_Type then
5928 Flag_Non_Static_Expr
5929 ("static integer expression required here", N);
5934 --------------------------
5935 -- Statically_Different --
5936 --------------------------
5938 function Statically_Different (E1, E2 : Node_Id) return Boolean is
5939 R1 : constant Node_Id := Get_Referenced_Object (E1);
5940 R2 : constant Node_Id := Get_Referenced_Object (E2);
5943 return Is_Entity_Name (R1)
5944 and then Is_Entity_Name (R2)
5945 and then Entity (R1) /= Entity (R2)
5946 and then not Is_Formal (Entity (R1))
5947 and then not Is_Formal (Entity (R2));
5948 end Statically_Different;
5950 -----------------------------
5951 -- Subprogram_Access_Level --
5952 -----------------------------
5954 function Subprogram_Access_Level (Subp : Entity_Id) return Uint is
5956 if Present (Alias (Subp)) then
5957 return Subprogram_Access_Level (Alias (Subp));
5959 return Scope_Depth (Enclosing_Dynamic_Scope (Subp));
5961 end Subprogram_Access_Level;
5967 procedure Trace_Scope (N : Node_Id; E : Entity_Id; Msg : String) is
5969 if Debug_Flag_W then
5970 for J in 0 .. Scope_Stack.Last loop
5975 Write_Name (Chars (E));
5976 Write_Str (" line ");
5977 Write_Int (Int (Get_Logical_Line_Number (Sloc (N))));
5982 -----------------------
5983 -- Transfer_Entities --
5984 -----------------------
5986 procedure Transfer_Entities (From : Entity_Id; To : Entity_Id) is
5987 Ent : Entity_Id := First_Entity (From);
5994 if (Last_Entity (To)) = Empty then
5995 Set_First_Entity (To, Ent);
5997 Set_Next_Entity (Last_Entity (To), Ent);
6000 Set_Last_Entity (To, Last_Entity (From));
6002 while Present (Ent) loop
6003 Set_Scope (Ent, To);
6005 if not Is_Public (Ent) then
6006 Set_Public_Status (Ent);
6009 and then Ekind (Ent) = E_Record_Subtype
6012 -- The components of the propagated Itype must be public
6019 Comp := First_Entity (Ent);
6021 while Present (Comp) loop
6022 Set_Is_Public (Comp);
6032 Set_First_Entity (From, Empty);
6033 Set_Last_Entity (From, Empty);
6034 end Transfer_Entities;
6036 -----------------------
6037 -- Type_Access_Level --
6038 -----------------------
6040 function Type_Access_Level (Typ : Entity_Id) return Uint is
6041 Btyp : Entity_Id := Base_Type (Typ);
6044 -- If the type is an anonymous access type we treat it as being
6045 -- declared at the library level to ensure that names such as
6046 -- X.all'access don't fail static accessibility checks.
6048 if Ekind (Btyp) in Access_Kind then
6049 if Ekind (Btyp) = E_Anonymous_Access_Type then
6050 return Scope_Depth (Standard_Standard);
6053 Btyp := Root_Type (Btyp);
6056 return Scope_Depth (Enclosing_Dynamic_Scope (Btyp));
6057 end Type_Access_Level;
6059 --------------------------
6060 -- Unit_Declaration_Node --
6061 --------------------------
6063 function Unit_Declaration_Node (Unit_Id : Entity_Id) return Node_Id is
6064 N : Node_Id := Parent (Unit_Id);
6067 -- Predefined operators do not have a full function declaration.
6069 if Ekind (Unit_Id) = E_Operator then
6073 while Nkind (N) /= N_Abstract_Subprogram_Declaration
6074 and then Nkind (N) /= N_Formal_Package_Declaration
6075 and then Nkind (N) /= N_Formal_Subprogram_Declaration
6076 and then Nkind (N) /= N_Function_Instantiation
6077 and then Nkind (N) /= N_Generic_Package_Declaration
6078 and then Nkind (N) /= N_Generic_Subprogram_Declaration
6079 and then Nkind (N) /= N_Package_Declaration
6080 and then Nkind (N) /= N_Package_Body
6081 and then Nkind (N) /= N_Package_Instantiation
6082 and then Nkind (N) /= N_Package_Renaming_Declaration
6083 and then Nkind (N) /= N_Procedure_Instantiation
6084 and then Nkind (N) /= N_Protected_Body
6085 and then Nkind (N) /= N_Subprogram_Declaration
6086 and then Nkind (N) /= N_Subprogram_Body
6087 and then Nkind (N) /= N_Subprogram_Body_Stub
6088 and then Nkind (N) /= N_Subprogram_Renaming_Declaration
6089 and then Nkind (N) /= N_Task_Body
6090 and then Nkind (N) /= N_Task_Type_Declaration
6091 and then Nkind (N) not in N_Generic_Renaming_Declaration
6094 pragma Assert (Present (N));
6098 end Unit_Declaration_Node;
6100 ------------------------------
6101 -- Universal_Interpretation --
6102 ------------------------------
6104 function Universal_Interpretation (Opnd : Node_Id) return Entity_Id is
6105 Index : Interp_Index;
6109 -- The argument may be a formal parameter of an operator or subprogram
6110 -- with multiple interpretations, or else an expression for an actual.
6112 if Nkind (Opnd) = N_Defining_Identifier
6113 or else not Is_Overloaded (Opnd)
6115 if Etype (Opnd) = Universal_Integer
6116 or else Etype (Opnd) = Universal_Real
6118 return Etype (Opnd);
6124 Get_First_Interp (Opnd, Index, It);
6126 while Present (It.Typ) loop
6128 if It.Typ = Universal_Integer
6129 or else It.Typ = Universal_Real
6134 Get_Next_Interp (Index, It);
6139 end Universal_Interpretation;
6141 ----------------------
6142 -- Within_Init_Proc --
6143 ----------------------
6145 function Within_Init_Proc return Boolean is
6150 while not Is_Overloadable (S) loop
6151 if S = Standard_Standard then
6158 return Is_Init_Proc (S);
6159 end Within_Init_Proc;
6165 procedure Wrong_Type (Expr : Node_Id; Expected_Type : Entity_Id) is
6166 Found_Type : constant Entity_Id := First_Subtype (Etype (Expr));
6167 Expec_Type : constant Entity_Id := First_Subtype (Expected_Type);
6169 function Has_One_Matching_Field return Boolean;
6170 -- Determines whether Expec_Type is a record type with a single
6171 -- component or discriminant whose type matches the found type or
6172 -- is a one dimensional array whose component type matches the
6175 function Has_One_Matching_Field return Boolean is
6179 if Is_Array_Type (Expec_Type)
6180 and then Number_Dimensions (Expec_Type) = 1
6182 Covers (Etype (Component_Type (Expec_Type)), Found_Type)
6186 elsif not Is_Record_Type (Expec_Type) then
6190 E := First_Entity (Expec_Type);
6196 elsif (Ekind (E) /= E_Discriminant
6197 and then Ekind (E) /= E_Component)
6198 or else (Chars (E) = Name_uTag
6199 or else Chars (E) = Name_uParent)
6208 if not Covers (Etype (E), Found_Type) then
6211 elsif Present (Next_Entity (E)) then
6218 end Has_One_Matching_Field;
6220 -- Start of processing for Wrong_Type
6223 -- Don't output message if either type is Any_Type, or if a message
6224 -- has already been posted for this node. We need to do the latter
6225 -- check explicitly (it is ordinarily done in Errout), because we
6226 -- are using ! to force the output of the error messages.
6228 if Expec_Type = Any_Type
6229 or else Found_Type = Any_Type
6230 or else Error_Posted (Expr)
6234 -- In an instance, there is an ongoing problem with completion of
6235 -- type derived from private types. Their structure is what Gigi
6236 -- expects, but the Etype is the parent type rather than the
6237 -- derived private type itself. Do not flag error in this case. The
6238 -- private completion is an entity without a parent, like an Itype.
6239 -- Similarly, full and partial views may be incorrect in the instance.
6240 -- There is no simple way to insure that it is consistent ???
6242 elsif In_Instance then
6244 if Etype (Etype (Expr)) = Etype (Expected_Type)
6246 (Has_Private_Declaration (Expected_Type)
6247 or else Has_Private_Declaration (Etype (Expr)))
6248 and then No (Parent (Expected_Type))
6254 -- An interesting special check. If the expression is parenthesized
6255 -- and its type corresponds to the type of the sole component of the
6256 -- expected record type, or to the component type of the expected one
6257 -- dimensional array type, then assume we have a bad aggregate attempt.
6259 if Nkind (Expr) in N_Subexpr
6260 and then Paren_Count (Expr) /= 0
6261 and then Has_One_Matching_Field
6263 Error_Msg_N ("positional aggregate cannot have one component", Expr);
6265 -- Another special check, if we are looking for a pool-specific access
6266 -- type and we found an E_Access_Attribute_Type, then we have the case
6267 -- of an Access attribute being used in a context which needs a pool-
6268 -- specific type, which is never allowed. The one extra check we make
6269 -- is that the expected designated type covers the Found_Type.
6271 elsif Is_Access_Type (Expec_Type)
6272 and then Ekind (Found_Type) = E_Access_Attribute_Type
6273 and then Ekind (Base_Type (Expec_Type)) /= E_General_Access_Type
6274 and then Ekind (Base_Type (Expec_Type)) /= E_Anonymous_Access_Type
6276 (Designated_Type (Expec_Type), Designated_Type (Found_Type))
6278 Error_Msg_N ("result must be general access type!", Expr);
6279 Error_Msg_NE ("add ALL to }!", Expr, Expec_Type);
6281 -- If the expected type is an anonymous access type, as for access
6282 -- parameters and discriminants, the error is on the designated types.
6284 elsif Ekind (Expec_Type) = E_Anonymous_Access_Type then
6285 if Comes_From_Source (Expec_Type) then
6286 Error_Msg_NE ("expected}!", Expr, Expec_Type);
6289 ("expected an access type with designated}",
6290 Expr, Designated_Type (Expec_Type));
6293 if Is_Access_Type (Found_Type)
6294 and then not Comes_From_Source (Found_Type)
6297 ("found an access type with designated}!",
6298 Expr, Designated_Type (Found_Type));
6300 if From_With_Type (Found_Type) then
6301 Error_Msg_NE ("found incomplete}!", Expr, Found_Type);
6303 ("\possibly missing with_clause on&", Expr,
6304 Scope (Found_Type));
6306 Error_Msg_NE ("found}!", Expr, Found_Type);
6310 -- Normal case of one type found, some other type expected
6313 -- If the names of the two types are the same, see if some
6314 -- number of levels of qualification will help. Don't try
6315 -- more than three levels, and if we get to standard, it's
6316 -- no use (and probably represents an error in the compiler)
6317 -- Also do not bother with internal scope names.
6320 Expec_Scope : Entity_Id;
6321 Found_Scope : Entity_Id;
6324 Expec_Scope := Expec_Type;
6325 Found_Scope := Found_Type;
6327 for Levels in Int range 0 .. 3 loop
6328 if Chars (Expec_Scope) /= Chars (Found_Scope) then
6329 Error_Msg_Qual_Level := Levels;
6333 Expec_Scope := Scope (Expec_Scope);
6334 Found_Scope := Scope (Found_Scope);
6336 exit when Expec_Scope = Standard_Standard
6338 Found_Scope = Standard_Standard
6340 not Comes_From_Source (Expec_Scope)
6342 not Comes_From_Source (Found_Scope);
6346 Error_Msg_NE ("expected}!", Expr, Expec_Type);
6348 if Is_Entity_Name (Expr)
6349 and then Is_Package (Entity (Expr))
6351 Error_Msg_N ("found package name!", Expr);
6353 elsif Is_Entity_Name (Expr)
6355 (Ekind (Entity (Expr)) = E_Procedure
6357 Ekind (Entity (Expr)) = E_Generic_Procedure)
6359 Error_Msg_N ("found procedure name instead of function!", Expr);
6361 -- catch common error: a prefix or infix operator which is not
6362 -- directly visible because the type isn't.
6364 elsif Nkind (Expr) in N_Op
6365 and then Is_Overloaded (Expr)
6366 and then not Is_Immediately_Visible (Expec_Type)
6367 and then not Is_Potentially_Use_Visible (Expec_Type)
6368 and then not In_Use (Expec_Type)
6369 and then Has_Compatible_Type (Right_Opnd (Expr), Expec_Type)
6372 "operator of the type is not directly visible!", Expr);
6374 elsif Ekind (Found_Type) = E_Void
6375 and then Present (Parent (Found_Type))
6376 and then Nkind (Parent (Found_Type)) = N_Full_Type_Declaration
6378 Error_Msg_NE ("found premature usage of}!", Expr, Found_Type);
6381 Error_Msg_NE ("found}!", Expr, Found_Type);
6384 Error_Msg_Qual_Level := 0;