1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
9 -- Copyright (C) 1992-2008, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
35 with Ada.Unchecked_Conversion;
37 with System.Storage_Elements; use System.Storage_Elements;
38 with System.WCh_Con; use System.WCh_Con;
39 with System.WCh_StW; use System.WCh_StW;
41 pragma Elaborate_All (System.HTable);
43 package body Ada.Tags is
45 -----------------------
46 -- Local Subprograms --
47 -----------------------
49 function CW_Membership (Obj_Tag : Tag; Typ_Tag : Tag) return Boolean;
50 -- Given the tag of an object and the tag associated to a type, return
51 -- true if Obj is in Typ'Class.
53 function Get_External_Tag (T : Tag) return System.Address;
54 -- Returns address of a null terminated string containing the external name
56 function Is_Primary_DT (T : Tag) return Boolean;
57 -- Given a tag returns True if it has the signature of a primary dispatch
58 -- table. This is Inline_Always since it is called from other Inline_
59 -- Always subprograms where we want no out of line code to be generated.
61 function Length (Str : Cstring_Ptr) return Natural;
62 -- Length of string represented by the given pointer (treating the string
63 -- as a C-style string, which is Nul terminated).
65 function OSD (T : Tag) return Object_Specific_Data_Ptr;
66 -- Ada 2005 (AI-251): Given a pointer T to a secondary dispatch table,
67 -- retrieve the address of the record containing the Object Specific
70 function SSD (T : Tag) return Select_Specific_Data_Ptr;
71 -- Ada 2005 (AI-251): Given a pointer T to a dispatch Table, retrieves the
72 -- address of the record containing the Select Specific Data in T's TSD.
74 pragma Inline_Always (CW_Membership);
75 pragma Inline_Always (Get_External_Tag);
76 pragma Inline_Always (Is_Primary_DT);
77 pragma Inline_Always (OSD);
78 pragma Inline_Always (SSD);
80 -- Unchecked conversions
82 function To_Address is
83 new Unchecked_Conversion (Cstring_Ptr, System.Address);
85 function To_Cstring_Ptr is
86 new Unchecked_Conversion (System.Address, Cstring_Ptr);
88 -- Disable warnings on possible aliasing problem
91 new Unchecked_Conversion (Integer_Address, Tag);
93 function To_Addr_Ptr is
94 new Ada.Unchecked_Conversion (System.Address, Addr_Ptr);
96 function To_Address is
97 new Ada.Unchecked_Conversion (Tag, System.Address);
99 function To_Dispatch_Table_Ptr is
100 new Ada.Unchecked_Conversion (Tag, Dispatch_Table_Ptr);
102 function To_Dispatch_Table_Ptr is
103 new Ada.Unchecked_Conversion (System.Address, Dispatch_Table_Ptr);
105 function To_Object_Specific_Data_Ptr is
106 new Ada.Unchecked_Conversion (System.Address, Object_Specific_Data_Ptr);
108 function To_Tag_Ptr is
109 new Ada.Unchecked_Conversion (System.Address, Tag_Ptr);
111 function To_Type_Specific_Data_Ptr is
112 new Ada.Unchecked_Conversion (System.Address, Type_Specific_Data_Ptr);
114 -------------------------------
115 -- Inline_Always Subprograms --
116 -------------------------------
118 -- Inline_always subprograms must be placed before their first call to
119 -- avoid defeating the frontend inlining mechanism and thus ensure the
120 -- generation of their correct debug info.
126 -- Canonical implementation of Classwide Membership corresponding to:
130 -- Each dispatch table contains a reference to a table of ancestors (stored
131 -- in the first part of the Tags_Table) and a count of the level of
132 -- inheritance "Idepth".
134 -- Obj is in Typ'Class if Typ'Tag is in the table of ancestors that are
135 -- contained in the dispatch table referenced by Obj'Tag . Knowing the
136 -- level of inheritance of both types, this can be computed in constant
137 -- time by the formula:
139 -- TSD (Obj'tag).Tags_Table (TSD (Obj'tag).Idepth - TSD (Typ'tag).Idepth)
142 function CW_Membership (Obj_Tag : Tag; Typ_Tag : Tag) return Boolean is
143 Obj_TSD_Ptr : constant Addr_Ptr :=
144 To_Addr_Ptr (To_Address (Obj_Tag) - DT_Typeinfo_Ptr_Size);
145 Typ_TSD_Ptr : constant Addr_Ptr :=
146 To_Addr_Ptr (To_Address (Typ_Tag) - DT_Typeinfo_Ptr_Size);
147 Obj_TSD : constant Type_Specific_Data_Ptr :=
148 To_Type_Specific_Data_Ptr (Obj_TSD_Ptr.all);
149 Typ_TSD : constant Type_Specific_Data_Ptr :=
150 To_Type_Specific_Data_Ptr (Typ_TSD_Ptr.all);
151 Pos : constant Integer := Obj_TSD.Idepth - Typ_TSD.Idepth;
153 return Pos >= 0 and then Obj_TSD.Tags_Table (Pos) = Typ_Tag;
156 ----------------------
157 -- Get_External_Tag --
158 ----------------------
160 function Get_External_Tag (T : Tag) return System.Address is
161 TSD_Ptr : constant Addr_Ptr :=
162 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
163 TSD : constant Type_Specific_Data_Ptr :=
164 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
166 return To_Address (TSD.External_Tag);
167 end Get_External_Tag;
173 function Is_Primary_DT (T : Tag) return Boolean is
175 return DT (T).Signature = Primary_DT;
182 function OSD (T : Tag) return Object_Specific_Data_Ptr is
183 OSD_Ptr : constant Addr_Ptr :=
184 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
186 return To_Object_Specific_Data_Ptr (OSD_Ptr.all);
193 function SSD (T : Tag) return Select_Specific_Data_Ptr is
194 TSD_Ptr : constant Addr_Ptr :=
195 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
196 TSD : constant Type_Specific_Data_Ptr :=
197 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
202 -------------------------
203 -- External_Tag_HTable --
204 -------------------------
206 type HTable_Headers is range 1 .. 64;
208 -- The following internal package defines the routines used for the
209 -- instantiation of a new System.HTable.Static_HTable (see below). See
210 -- spec in g-htable.ads for details of usage.
212 package HTable_Subprograms is
213 procedure Set_HT_Link (T : Tag; Next : Tag);
214 function Get_HT_Link (T : Tag) return Tag;
215 function Hash (F : System.Address) return HTable_Headers;
216 function Equal (A, B : System.Address) return Boolean;
217 end HTable_Subprograms;
219 package External_Tag_HTable is new System.HTable.Static_HTable (
220 Header_Num => HTable_Headers,
221 Element => Dispatch_Table,
224 Set_Next => HTable_Subprograms.Set_HT_Link,
225 Next => HTable_Subprograms.Get_HT_Link,
226 Key => System.Address,
227 Get_Key => Get_External_Tag,
228 Hash => HTable_Subprograms.Hash,
229 Equal => HTable_Subprograms.Equal);
231 ------------------------
232 -- HTable_Subprograms --
233 ------------------------
235 -- Bodies of routines for hash table instantiation
237 package body HTable_Subprograms is
243 function Equal (A, B : System.Address) return Boolean is
244 Str1 : constant Cstring_Ptr := To_Cstring_Ptr (A);
245 Str2 : constant Cstring_Ptr := To_Cstring_Ptr (B);
249 if Str1 (J) /= Str2 (J) then
251 elsif Str1 (J) = ASCII.NUL then
263 function Get_HT_Link (T : Tag) return Tag is
264 TSD_Ptr : constant Addr_Ptr :=
265 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
266 TSD : constant Type_Specific_Data_Ptr :=
267 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
269 return TSD.HT_Link.all;
276 function Hash (F : System.Address) return HTable_Headers is
277 function H is new System.HTable.Hash (HTable_Headers);
278 Str : constant Cstring_Ptr := To_Cstring_Ptr (F);
279 Res : constant HTable_Headers := H (Str (1 .. Length (Str)));
288 procedure Set_HT_Link (T : Tag; Next : Tag) is
289 TSD_Ptr : constant Addr_Ptr :=
290 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
291 TSD : constant Type_Specific_Data_Ptr :=
292 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
294 TSD.HT_Link.all := Next;
297 end HTable_Subprograms;
303 function Base_Address (This : System.Address) return System.Address is
305 return This - Offset_To_Top (This);
312 function Descendant_Tag (External : String; Ancestor : Tag) return Tag is
313 Int_Tag : constant Tag := Internal_Tag (External);
316 if not Is_Descendant_At_Same_Level (Int_Tag, Ancestor) then
328 (This : System.Address;
329 T : Tag) return System.Address
331 Iface_Table : Interface_Data_Ptr;
332 Obj_Base : System.Address;
333 Obj_DT : Dispatch_Table_Ptr;
337 if System."=" (This, System.Null_Address) then
338 return System.Null_Address;
341 Obj_Base := Base_Address (This);
342 Obj_DT_Tag := To_Tag_Ptr (Obj_Base).all;
343 Obj_DT := DT (To_Tag_Ptr (Obj_Base).all);
344 Iface_Table := To_Type_Specific_Data_Ptr (Obj_DT.TSD).Interfaces_Table;
346 if Iface_Table /= null then
347 for Id in 1 .. Iface_Table.Nb_Ifaces loop
348 if Iface_Table.Ifaces_Table (Id).Iface_Tag = T then
350 -- Case of Static value of Offset_To_Top
352 if Iface_Table.Ifaces_Table (Id).Static_Offset_To_Top then
353 Obj_Base := Obj_Base +
354 Iface_Table.Ifaces_Table (Id).Offset_To_Top_Value;
356 -- Otherwise call the function generated by the expander to
357 -- provide the value.
360 Obj_Base := Obj_Base +
361 Iface_Table.Ifaces_Table (Id).Offset_To_Top_Func.all
370 -- Check if T is an immediate ancestor. This is required to handle
371 -- conversion of class-wide interfaces to tagged types.
373 if CW_Membership (Obj_DT_Tag, T) then
377 -- If the object does not implement the interface we must raise CE
379 raise Constraint_Error with "invalid interface conversion";
386 function DT (T : Tag) return Dispatch_Table_Ptr is
387 Offset : constant SSE.Storage_Offset :=
388 To_Dispatch_Table_Ptr (T).Prims_Ptr'Position;
390 return To_Dispatch_Table_Ptr (To_Address (T) - Offset);
397 -- Canonical implementation of Classwide Membership corresponding to:
399 -- Obj in Iface'Class
401 -- Each dispatch table contains a table with the tags of all the
402 -- implemented interfaces.
404 -- Obj is in Iface'Class if Iface'Tag is found in the table of interfaces
405 -- that are contained in the dispatch table referenced by Obj'Tag.
407 function IW_Membership (This : System.Address; T : Tag) return Boolean is
408 Iface_Table : Interface_Data_Ptr;
409 Obj_Base : System.Address;
410 Obj_DT : Dispatch_Table_Ptr;
411 Obj_TSD : Type_Specific_Data_Ptr;
414 Obj_Base := Base_Address (This);
415 Obj_DT := DT (To_Tag_Ptr (Obj_Base).all);
416 Obj_TSD := To_Type_Specific_Data_Ptr (Obj_DT.TSD);
417 Iface_Table := Obj_TSD.Interfaces_Table;
419 if Iface_Table /= null then
420 for Id in 1 .. Iface_Table.Nb_Ifaces loop
421 if Iface_Table.Ifaces_Table (Id).Iface_Tag = T then
427 -- Look for the tag in the ancestor tags table. This is required for:
428 -- Iface_CW in Typ'Class
430 for Id in 0 .. Obj_TSD.Idepth loop
431 if Obj_TSD.Tags_Table (Id) = T then
443 function Expanded_Name (T : Tag) return String is
444 Result : Cstring_Ptr;
446 TSD : Type_Specific_Data_Ptr;
453 TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
454 TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
455 Result := TSD.Expanded_Name;
456 return Result (1 .. Length (Result));
463 function External_Tag (T : Tag) return String is
464 Result : Cstring_Ptr;
466 TSD : Type_Specific_Data_Ptr;
473 TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
474 TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
475 Result := TSD.External_Tag;
476 return Result (1 .. Length (Result));
479 ---------------------
480 -- Get_Entry_Index --
481 ---------------------
483 function Get_Entry_Index (T : Tag; Position : Positive) return Positive is
485 return SSD (T).SSD_Table (Position).Index;
488 ----------------------
489 -- Get_Prim_Op_Kind --
490 ----------------------
492 function Get_Prim_Op_Kind
494 Position : Positive) return Prim_Op_Kind
497 return SSD (T).SSD_Table (Position).Kind;
498 end Get_Prim_Op_Kind;
500 ----------------------
501 -- Get_Offset_Index --
502 ----------------------
504 function Get_Offset_Index
506 Position : Positive) return Positive
509 if Is_Primary_DT (T) then
512 return OSD (T).OSD_Table (Position);
514 end Get_Offset_Index;
520 function Get_RC_Offset (T : Tag) return SSE.Storage_Offset is
521 TSD_Ptr : constant Addr_Ptr :=
522 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
523 TSD : constant Type_Specific_Data_Ptr :=
524 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
526 return TSD.RC_Offset;
529 ---------------------
530 -- Get_Tagged_Kind --
531 ---------------------
533 function Get_Tagged_Kind (T : Tag) return Tagged_Kind is
535 return DT (T).Tag_Kind;
538 -----------------------------
539 -- Interface_Ancestor_Tags --
540 -----------------------------
542 function Interface_Ancestor_Tags (T : Tag) return Tag_Array is
543 TSD_Ptr : constant Addr_Ptr :=
544 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
545 TSD : constant Type_Specific_Data_Ptr :=
546 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
547 Iface_Table : constant Interface_Data_Ptr := TSD.Interfaces_Table;
550 if Iface_Table = null then
552 Table : Tag_Array (1 .. 0);
558 Table : Tag_Array (1 .. Iface_Table.Nb_Ifaces);
560 for J in 1 .. Iface_Table.Nb_Ifaces loop
561 Table (J) := Iface_Table.Ifaces_Table (J).Iface_Tag;
567 end Interface_Ancestor_Tags;
573 -- Internal tags have the following format:
574 -- "Internal tag at 16#ADDRESS#: <full-name-of-tagged-type>"
576 Internal_Tag_Header : constant String := "Internal tag at ";
577 Header_Separator : constant Character := '#';
579 function Internal_Tag (External : String) return Tag is
580 Ext_Copy : aliased String (External'First .. External'Last + 1);
584 -- Handle locally defined tagged types
586 if External'Length > Internal_Tag_Header'Length
588 External (External'First ..
589 External'First + Internal_Tag_Header'Length - 1)
590 = Internal_Tag_Header
593 Addr_First : constant Natural :=
594 External'First + Internal_Tag_Header'Length;
596 Addr : Integer_Address;
599 -- Search the second separator (#) to identify the address
601 Addr_Last := Addr_First;
604 while Addr_Last <= External'Last
605 and then External (Addr_Last) /= Header_Separator
607 Addr_Last := Addr_Last + 1;
610 -- Skip the first separator
613 Addr_Last := Addr_Last + 1;
617 if Addr_Last <= External'Last then
619 -- Protect the run-time against wrong internal tags. We
620 -- cannot use exception handlers here because it would
621 -- disable the use of this run-time compiling with
622 -- restriction No_Exception_Handler.
626 Wrong_Tag : Boolean := False;
629 if External (Addr_First) /= '1'
630 or else External (Addr_First + 1) /= '6'
631 or else External (Addr_First + 2) /= '#'
636 for J in Addr_First + 3 .. Addr_Last - 1 loop
639 if not (C in '0' .. '9')
640 and then not (C in 'A' .. 'F')
641 and then not (C in 'a' .. 'f')
649 -- Convert the numeric value into a tag
651 if not Wrong_Tag then
652 Addr := Integer_Address'Value
653 (External (Addr_First .. Addr_Last));
655 -- Internal tags never have value 0
658 return To_Tag (Addr);
665 -- Handle library-level tagged types
668 -- Make NUL-terminated copy of external tag string
670 Ext_Copy (External'Range) := External;
671 Ext_Copy (Ext_Copy'Last) := ASCII.NUL;
672 Res := External_Tag_HTable.Get (Ext_Copy'Address);
677 Msg1 : constant String := "unknown tagged type: ";
678 Msg2 : String (1 .. Msg1'Length + External'Length);
681 Msg2 (1 .. Msg1'Length) := Msg1;
682 Msg2 (Msg1'Length + 1 .. Msg1'Length + External'Length) :=
684 Ada.Exceptions.Raise_Exception (Tag_Error'Identity, Msg2);
691 ---------------------------------
692 -- Is_Descendant_At_Same_Level --
693 ---------------------------------
695 function Is_Descendant_At_Same_Level
697 Ancestor : Tag) return Boolean
699 D_TSD_Ptr : constant Addr_Ptr :=
700 To_Addr_Ptr (To_Address (Descendant)
701 - DT_Typeinfo_Ptr_Size);
702 A_TSD_Ptr : constant Addr_Ptr :=
703 To_Addr_Ptr (To_Address (Ancestor) - DT_Typeinfo_Ptr_Size);
704 D_TSD : constant Type_Specific_Data_Ptr :=
705 To_Type_Specific_Data_Ptr (D_TSD_Ptr.all);
706 A_TSD : constant Type_Specific_Data_Ptr :=
707 To_Type_Specific_Data_Ptr (A_TSD_Ptr.all);
710 return CW_Membership (Descendant, Ancestor)
711 and then D_TSD.Access_Level = A_TSD.Access_Level;
712 end Is_Descendant_At_Same_Level;
718 function Length (Str : Cstring_Ptr) return Natural is
723 while Str (Len) /= ASCII.NUL loop
734 function Offset_To_Top
735 (This : System.Address) return SSE.Storage_Offset
737 Tag_Size : constant SSE.Storage_Count :=
738 SSE.Storage_Count (1 * (Standard'Address_Size / System.Storage_Unit));
740 type Storage_Offset_Ptr is access SSE.Storage_Offset;
741 function To_Storage_Offset_Ptr is
742 new Unchecked_Conversion (System.Address, Storage_Offset_Ptr);
744 Curr_DT : Dispatch_Table_Ptr;
747 Curr_DT := DT (To_Tag_Ptr (This).all);
749 if Curr_DT.Offset_To_Top = SSE.Storage_Offset'Last then
750 return To_Storage_Offset_Ptr (This + Tag_Size).all;
752 return Curr_DT.Offset_To_Top;
761 (Obj : System.Address;
762 T : Tag) return SSE.Storage_Count
764 Parent_Slot : constant Positive := 1;
765 -- The tag of the parent is always in the first slot of the table of
768 TSD_Ptr : constant Addr_Ptr :=
769 To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
770 TSD : constant Type_Specific_Data_Ptr :=
771 To_Type_Specific_Data_Ptr (TSD_Ptr.all);
772 -- Pointer to the TSD
774 Parent_Tag : constant Tag := TSD.Tags_Table (Parent_Slot);
775 Parent_TSD_Ptr : constant Addr_Ptr :=
776 To_Addr_Ptr (To_Address (Parent_Tag)
777 - DT_Typeinfo_Ptr_Size);
778 Parent_TSD : constant Type_Specific_Data_Ptr :=
779 To_Type_Specific_Data_Ptr (Parent_TSD_Ptr.all);
782 -- Here we compute the size of the _parent field of the object
784 return SSE.Storage_Count (Parent_TSD.Size_Func.all (Obj));
791 function Parent_Tag (T : Tag) return Tag is
793 TSD : Type_Specific_Data_Ptr;
800 TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
801 TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
803 -- The Parent_Tag of a root-level tagged type is defined to be No_Tag.
804 -- The first entry in the Ancestors_Tags array will be null for such
805 -- a type, but it's better to be explicit about returning No_Tag in
808 if TSD.Idepth = 0 then
811 return TSD.Tags_Table (1);
815 -------------------------------
816 -- Register_Interface_Offset --
817 -------------------------------
819 procedure Register_Interface_Offset
820 (This : System.Address;
823 Offset_Value : SSE.Storage_Offset;
824 Offset_Func : Offset_To_Top_Function_Ptr)
826 Prim_DT : Dispatch_Table_Ptr;
827 Iface_Table : Interface_Data_Ptr;
830 -- "This" points to the primary DT and we must save Offset_Value in
831 -- the Offset_To_Top field of the corresponding dispatch table.
833 Prim_DT := DT (To_Tag_Ptr (This).all);
834 Iface_Table := To_Type_Specific_Data_Ptr (Prim_DT.TSD).Interfaces_Table;
836 -- Save Offset_Value in the table of interfaces of the primary DT.
837 -- This data will be used by the subprogram "Displace" to give support
838 -- to backward abstract interface type conversions.
840 -- Register the offset in the table of interfaces
842 if Iface_Table /= null then
843 for Id in 1 .. Iface_Table.Nb_Ifaces loop
844 if Iface_Table.Ifaces_Table (Id).Iface_Tag = Interface_T then
845 if Is_Static or else Offset_Value = 0 then
846 Iface_Table.Ifaces_Table (Id).Static_Offset_To_Top := True;
847 Iface_Table.Ifaces_Table (Id).Offset_To_Top_Value :=
850 Iface_Table.Ifaces_Table (Id).Static_Offset_To_Top := False;
851 Iface_Table.Ifaces_Table (Id).Offset_To_Top_Func :=
860 -- If we arrive here there is some error in the run-time data structure
863 end Register_Interface_Offset;
869 procedure Register_Tag (T : Tag) is
871 External_Tag_HTable.Set (T);
878 function Secondary_Tag (T, Iface : Tag) return Tag is
879 Iface_Table : Interface_Data_Ptr;
880 Obj_DT : Dispatch_Table_Ptr;
883 if not Is_Primary_DT (T) then
888 Iface_Table := To_Type_Specific_Data_Ptr (Obj_DT.TSD).Interfaces_Table;
890 if Iface_Table /= null then
891 for Id in 1 .. Iface_Table.Nb_Ifaces loop
892 if Iface_Table.Ifaces_Table (Id).Iface_Tag = Iface then
893 return Iface_Table.Ifaces_Table (Id).Secondary_DT;
898 -- If the object does not implement the interface we must raise CE
900 raise Constraint_Error with "invalid interface conversion";
903 ---------------------
904 -- Set_Entry_Index --
905 ---------------------
907 procedure Set_Entry_Index
913 SSD (T).SSD_Table (Position).Index := Value;
916 -----------------------
917 -- Set_Offset_To_Top --
918 -----------------------
920 procedure Set_Dynamic_Offset_To_Top
921 (This : System.Address;
923 Offset_Value : SSE.Storage_Offset;
924 Offset_Func : Offset_To_Top_Function_Ptr)
926 Sec_Base : System.Address;
927 Sec_DT : Dispatch_Table_Ptr;
929 -- Save the offset to top field in the secondary dispatch table
931 if Offset_Value /= 0 then
932 Sec_Base := This + Offset_Value;
933 Sec_DT := DT (To_Tag_Ptr (Sec_Base).all);
934 Sec_DT.Offset_To_Top := SSE.Storage_Offset'Last;
937 Register_Interface_Offset
938 (This, Interface_T, False, Offset_Value, Offset_Func);
939 end Set_Dynamic_Offset_To_Top;
941 ----------------------
942 -- Set_Prim_Op_Kind --
943 ----------------------
945 procedure Set_Prim_Op_Kind
948 Value : Prim_Op_Kind)
951 SSD (T).SSD_Table (Position).Kind := Value;
952 end Set_Prim_Op_Kind;
954 ------------------------
955 -- Wide_Expanded_Name --
956 ------------------------
958 WC_Encoding : Character;
959 pragma Import (C, WC_Encoding, "__gl_wc_encoding");
960 -- Encoding method for source, as exported by binder
962 function Wide_Expanded_Name (T : Tag) return Wide_String is
963 S : constant String := Expanded_Name (T);
964 W : Wide_String (1 .. S'Length);
967 String_To_Wide_String
968 (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
970 end Wide_Expanded_Name;
972 -----------------------------
973 -- Wide_Wide_Expanded_Name --
974 -----------------------------
976 function Wide_Wide_Expanded_Name (T : Tag) return Wide_Wide_String is
977 S : constant String := Expanded_Name (T);
978 W : Wide_Wide_String (1 .. S'Length);
981 String_To_Wide_Wide_String
982 (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
984 end Wide_Wide_Expanded_Name;