1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
33 with Ada
.Unchecked_Conversion
;
35 with System
.Storage_Elements
; use System
.Storage_Elements
;
36 with System
.WCh_Con
; use System
.WCh_Con
;
37 with System
.WCh_StW
; use System
.WCh_StW
;
39 pragma Elaborate_All
(System
.HTable
);
41 package body Ada
.Tags
is
43 -----------------------
44 -- Local Subprograms --
45 -----------------------
47 function CW_Membership
(Obj_Tag
: Tag
; Typ_Tag
: Tag
) return Boolean;
48 -- Given the tag of an object and the tag associated to a type, return
49 -- true if Obj is in Typ'Class.
51 function Get_External_Tag
(T
: Tag
) return System
.Address
;
52 -- Returns address of a null terminated string containing the external name
54 function Is_Primary_DT
(T
: Tag
) return Boolean;
55 -- Given a tag returns True if it has the signature of a primary dispatch
56 -- table. This is Inline_Always since it is called from other Inline_
57 -- Always subprograms where we want no out of line code to be generated.
59 function Length
(Str
: Cstring_Ptr
) return Natural;
60 -- Length of string represented by the given pointer (treating the string
61 -- as a C-style string, which is Nul terminated).
63 function OSD
(T
: Tag
) return Object_Specific_Data_Ptr
;
64 -- Ada 2005 (AI-251): Given a pointer T to a secondary dispatch table,
65 -- retrieve the address of the record containing the Object Specific
68 function SSD
(T
: Tag
) return Select_Specific_Data_Ptr
;
69 -- Ada 2005 (AI-251): Given a pointer T to a dispatch Table, retrieves the
70 -- address of the record containing the Select Specific Data in T's TSD.
72 pragma Inline_Always
(CW_Membership
);
73 pragma Inline_Always
(Get_External_Tag
);
74 pragma Inline_Always
(Is_Primary_DT
);
75 pragma Inline_Always
(OSD
);
76 pragma Inline_Always
(SSD
);
78 -- Unchecked conversions
80 function To_Address
is
81 new Unchecked_Conversion
(Cstring_Ptr
, System
.Address
);
83 function To_Cstring_Ptr
is
84 new Unchecked_Conversion
(System
.Address
, Cstring_Ptr
);
86 -- Disable warnings on possible aliasing problem
89 new Unchecked_Conversion
(Integer_Address
, Tag
);
91 function To_Addr_Ptr
is
92 new Ada
.Unchecked_Conversion
(System
.Address
, Addr_Ptr
);
94 function To_Address
is
95 new Ada
.Unchecked_Conversion
(Tag
, System
.Address
);
97 function To_Dispatch_Table_Ptr
is
98 new Ada
.Unchecked_Conversion
(Tag
, Dispatch_Table_Ptr
);
100 function To_Dispatch_Table_Ptr
is
101 new Ada
.Unchecked_Conversion
(System
.Address
, Dispatch_Table_Ptr
);
103 function To_Object_Specific_Data_Ptr
is
104 new Ada
.Unchecked_Conversion
(System
.Address
, Object_Specific_Data_Ptr
);
106 function To_Tag_Ptr
is
107 new Ada
.Unchecked_Conversion
(System
.Address
, Tag_Ptr
);
109 function To_Type_Specific_Data_Ptr
is
110 new Ada
.Unchecked_Conversion
(System
.Address
, Type_Specific_Data_Ptr
);
112 -------------------------------
113 -- Inline_Always Subprograms --
114 -------------------------------
116 -- Inline_always subprograms must be placed before their first call to
117 -- avoid defeating the frontend inlining mechanism and thus ensure the
118 -- generation of their correct debug info.
124 -- Canonical implementation of Classwide Membership corresponding to:
128 -- Each dispatch table contains a reference to a table of ancestors (stored
129 -- in the first part of the Tags_Table) and a count of the level of
130 -- inheritance "Idepth".
132 -- Obj is in Typ'Class if Typ'Tag is in the table of ancestors that are
133 -- contained in the dispatch table referenced by Obj'Tag . Knowing the
134 -- level of inheritance of both types, this can be computed in constant
135 -- time by the formula:
137 -- TSD (Obj'tag).Tags_Table (TSD (Obj'tag).Idepth - TSD (Typ'tag).Idepth)
140 function CW_Membership
(Obj_Tag
: Tag
; Typ_Tag
: Tag
) return Boolean is
141 Obj_TSD_Ptr
: constant Addr_Ptr
:=
142 To_Addr_Ptr
(To_Address
(Obj_Tag
) - DT_Typeinfo_Ptr_Size
);
143 Typ_TSD_Ptr
: constant Addr_Ptr
:=
144 To_Addr_Ptr
(To_Address
(Typ_Tag
) - DT_Typeinfo_Ptr_Size
);
145 Obj_TSD
: constant Type_Specific_Data_Ptr
:=
146 To_Type_Specific_Data_Ptr
(Obj_TSD_Ptr
.all);
147 Typ_TSD
: constant Type_Specific_Data_Ptr
:=
148 To_Type_Specific_Data_Ptr
(Typ_TSD_Ptr
.all);
149 Pos
: constant Integer := Obj_TSD
.Idepth
- Typ_TSD
.Idepth
;
151 return Pos
>= 0 and then Obj_TSD
.Tags_Table
(Pos
) = Typ_Tag
;
154 ----------------------
155 -- Get_External_Tag --
156 ----------------------
158 function Get_External_Tag
(T
: Tag
) return System
.Address
is
159 TSD_Ptr
: constant Addr_Ptr
:=
160 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
161 TSD
: constant Type_Specific_Data_Ptr
:=
162 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
164 return To_Address
(TSD
.External_Tag
);
165 end Get_External_Tag
;
171 function Is_Primary_DT
(T
: Tag
) return Boolean is
173 return DT
(T
).Signature
= Primary_DT
;
180 function OSD
(T
: Tag
) return Object_Specific_Data_Ptr
is
181 OSD_Ptr
: constant Addr_Ptr
:=
182 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
184 return To_Object_Specific_Data_Ptr
(OSD_Ptr
.all);
191 function SSD
(T
: Tag
) return Select_Specific_Data_Ptr
is
192 TSD_Ptr
: constant Addr_Ptr
:=
193 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
194 TSD
: constant Type_Specific_Data_Ptr
:=
195 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
200 -------------------------
201 -- External_Tag_HTable --
202 -------------------------
204 type HTable_Headers
is range 1 .. 64;
206 -- The following internal package defines the routines used for the
207 -- instantiation of a new System.HTable.Static_HTable (see below). See
208 -- spec in g-htable.ads for details of usage.
210 package HTable_Subprograms
is
211 procedure Set_HT_Link
(T
: Tag
; Next
: Tag
);
212 function Get_HT_Link
(T
: Tag
) return Tag
;
213 function Hash
(F
: System
.Address
) return HTable_Headers
;
214 function Equal
(A
, B
: System
.Address
) return Boolean;
215 end HTable_Subprograms
;
217 package External_Tag_HTable
is new System
.HTable
.Static_HTable
(
218 Header_Num
=> HTable_Headers
,
219 Element
=> Dispatch_Table
,
222 Set_Next
=> HTable_Subprograms
.Set_HT_Link
,
223 Next
=> HTable_Subprograms
.Get_HT_Link
,
224 Key
=> System
.Address
,
225 Get_Key
=> Get_External_Tag
,
226 Hash
=> HTable_Subprograms
.Hash
,
227 Equal
=> HTable_Subprograms
.Equal
);
229 ------------------------
230 -- HTable_Subprograms --
231 ------------------------
233 -- Bodies of routines for hash table instantiation
235 package body HTable_Subprograms
is
241 function Equal
(A
, B
: System
.Address
) return Boolean is
242 Str1
: constant Cstring_Ptr
:= To_Cstring_Ptr
(A
);
243 Str2
: constant Cstring_Ptr
:= To_Cstring_Ptr
(B
);
247 if Str1
(J
) /= Str2
(J
) then
249 elsif Str1
(J
) = ASCII
.NUL
then
261 function Get_HT_Link
(T
: Tag
) return Tag
is
262 TSD_Ptr
: constant Addr_Ptr
:=
263 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
264 TSD
: constant Type_Specific_Data_Ptr
:=
265 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
267 return TSD
.HT_Link
.all;
274 function Hash
(F
: System
.Address
) return HTable_Headers
is
275 function H
is new System
.HTable
.Hash
(HTable_Headers
);
276 Str
: constant Cstring_Ptr
:= To_Cstring_Ptr
(F
);
277 Res
: constant HTable_Headers
:= H
(Str
(1 .. Length
(Str
)));
286 procedure Set_HT_Link
(T
: Tag
; Next
: Tag
) is
287 TSD_Ptr
: constant Addr_Ptr
:=
288 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
289 TSD
: constant Type_Specific_Data_Ptr
:=
290 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
292 TSD
.HT_Link
.all := Next
;
295 end HTable_Subprograms
;
301 function Base_Address
(This
: System
.Address
) return System
.Address
is
303 return This
- Offset_To_Top
(This
);
310 function Descendant_Tag
(External
: String; Ancestor
: Tag
) return Tag
is
311 Int_Tag
: constant Tag
:= Internal_Tag
(External
);
314 if not Is_Descendant_At_Same_Level
(Int_Tag
, Ancestor
) then
326 (This
: System
.Address
;
327 T
: Tag
) return System
.Address
329 Iface_Table
: Interface_Data_Ptr
;
330 Obj_Base
: System
.Address
;
331 Obj_DT
: Dispatch_Table_Ptr
;
335 if System
."=" (This
, System
.Null_Address
) then
336 return System
.Null_Address
;
339 Obj_Base
:= Base_Address
(This
);
340 Obj_DT_Tag
:= To_Tag_Ptr
(Obj_Base
).all;
341 Obj_DT
:= DT
(To_Tag_Ptr
(Obj_Base
).all);
342 Iface_Table
:= To_Type_Specific_Data_Ptr
(Obj_DT
.TSD
).Interfaces_Table
;
344 if Iface_Table
/= null then
345 for Id
in 1 .. Iface_Table
.Nb_Ifaces
loop
346 if Iface_Table
.Ifaces_Table
(Id
).Iface_Tag
= T
then
348 -- Case of Static value of Offset_To_Top
350 if Iface_Table
.Ifaces_Table
(Id
).Static_Offset_To_Top
then
351 Obj_Base
:= Obj_Base
+
352 Iface_Table
.Ifaces_Table
(Id
).Offset_To_Top_Value
;
354 -- Otherwise call the function generated by the expander to
355 -- provide the value.
358 Obj_Base
:= Obj_Base
+
359 Iface_Table
.Ifaces_Table
(Id
).Offset_To_Top_Func
.all
368 -- Check if T is an immediate ancestor. This is required to handle
369 -- conversion of class-wide interfaces to tagged types.
371 if CW_Membership
(Obj_DT_Tag
, T
) then
375 -- If the object does not implement the interface we must raise CE
377 raise Constraint_Error
with "invalid interface conversion";
384 function DT
(T
: Tag
) return Dispatch_Table_Ptr
is
385 Offset
: constant SSE
.Storage_Offset
:=
386 To_Dispatch_Table_Ptr
(T
).Prims_Ptr
'Position;
388 return To_Dispatch_Table_Ptr
(To_Address
(T
) - Offset
);
395 -- Canonical implementation of Classwide Membership corresponding to:
397 -- Obj in Iface'Class
399 -- Each dispatch table contains a table with the tags of all the
400 -- implemented interfaces.
402 -- Obj is in Iface'Class if Iface'Tag is found in the table of interfaces
403 -- that are contained in the dispatch table referenced by Obj'Tag.
405 function IW_Membership
(This
: System
.Address
; T
: Tag
) return Boolean is
406 Iface_Table
: Interface_Data_Ptr
;
407 Obj_Base
: System
.Address
;
408 Obj_DT
: Dispatch_Table_Ptr
;
409 Obj_TSD
: Type_Specific_Data_Ptr
;
412 Obj_Base
:= Base_Address
(This
);
413 Obj_DT
:= DT
(To_Tag_Ptr
(Obj_Base
).all);
414 Obj_TSD
:= To_Type_Specific_Data_Ptr
(Obj_DT
.TSD
);
415 Iface_Table
:= Obj_TSD
.Interfaces_Table
;
417 if Iface_Table
/= null then
418 for Id
in 1 .. Iface_Table
.Nb_Ifaces
loop
419 if Iface_Table
.Ifaces_Table
(Id
).Iface_Tag
= T
then
425 -- Look for the tag in the ancestor tags table. This is required for:
426 -- Iface_CW in Typ'Class
428 for Id
in 0 .. Obj_TSD
.Idepth
loop
429 if Obj_TSD
.Tags_Table
(Id
) = T
then
441 function Expanded_Name
(T
: Tag
) return String is
442 Result
: Cstring_Ptr
;
444 TSD
: Type_Specific_Data_Ptr
;
451 TSD_Ptr
:= To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
452 TSD
:= To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
453 Result
:= TSD
.Expanded_Name
;
454 return Result
(1 .. Length
(Result
));
461 function External_Tag
(T
: Tag
) return String is
462 Result
: Cstring_Ptr
;
464 TSD
: Type_Specific_Data_Ptr
;
471 TSD_Ptr
:= To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
472 TSD
:= To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
473 Result
:= TSD
.External_Tag
;
474 return Result
(1 .. Length
(Result
));
477 ---------------------
478 -- Get_Entry_Index --
479 ---------------------
481 function Get_Entry_Index
(T
: Tag
; Position
: Positive) return Positive is
483 return SSD
(T
).SSD_Table
(Position
).Index
;
486 ----------------------
487 -- Get_Prim_Op_Kind --
488 ----------------------
490 function Get_Prim_Op_Kind
492 Position
: Positive) return Prim_Op_Kind
495 return SSD
(T
).SSD_Table
(Position
).Kind
;
496 end Get_Prim_Op_Kind
;
498 ----------------------
499 -- Get_Offset_Index --
500 ----------------------
502 function Get_Offset_Index
504 Position
: Positive) return Positive
507 if Is_Primary_DT
(T
) then
510 return OSD
(T
).OSD_Table
(Position
);
512 end Get_Offset_Index
;
518 function Get_RC_Offset
(T
: Tag
) return SSE
.Storage_Offset
is
519 TSD_Ptr
: constant Addr_Ptr
:=
520 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
521 TSD
: constant Type_Specific_Data_Ptr
:=
522 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
524 return TSD
.RC_Offset
;
527 ---------------------
528 -- Get_Tagged_Kind --
529 ---------------------
531 function Get_Tagged_Kind
(T
: Tag
) return Tagged_Kind
is
533 return DT
(T
).Tag_Kind
;
536 -----------------------------
537 -- Interface_Ancestor_Tags --
538 -----------------------------
540 function Interface_Ancestor_Tags
(T
: Tag
) return Tag_Array
is
541 TSD_Ptr
: constant Addr_Ptr
:=
542 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
543 TSD
: constant Type_Specific_Data_Ptr
:=
544 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
545 Iface_Table
: constant Interface_Data_Ptr
:= TSD
.Interfaces_Table
;
548 if Iface_Table
= null then
550 Table
: Tag_Array
(1 .. 0);
556 Table
: Tag_Array
(1 .. Iface_Table
.Nb_Ifaces
);
558 for J
in 1 .. Iface_Table
.Nb_Ifaces
loop
559 Table
(J
) := Iface_Table
.Ifaces_Table
(J
).Iface_Tag
;
565 end Interface_Ancestor_Tags
;
571 -- Internal tags have the following format:
572 -- "Internal tag at 16#ADDRESS#: <full-name-of-tagged-type>"
574 Internal_Tag_Header
: constant String := "Internal tag at ";
575 Header_Separator
: constant Character := '#';
577 function Internal_Tag
(External
: String) return Tag
is
578 Ext_Copy
: aliased String (External
'First .. External
'Last + 1);
582 -- Handle locally defined tagged types
584 if External
'Length > Internal_Tag_Header
'Length
586 External
(External
'First ..
587 External
'First + Internal_Tag_Header
'Length - 1)
588 = Internal_Tag_Header
591 Addr_First
: constant Natural :=
592 External
'First + Internal_Tag_Header
'Length;
594 Addr
: Integer_Address
;
597 -- Search the second separator (#) to identify the address
599 Addr_Last
:= Addr_First
;
602 while Addr_Last
<= External
'Last
603 and then External
(Addr_Last
) /= Header_Separator
605 Addr_Last
:= Addr_Last
+ 1;
608 -- Skip the first separator
611 Addr_Last
:= Addr_Last
+ 1;
615 if Addr_Last
<= External
'Last then
617 -- Protect the run-time against wrong internal tags. We
618 -- cannot use exception handlers here because it would
619 -- disable the use of this run-time compiling with
620 -- restriction No_Exception_Handler.
624 Wrong_Tag
: Boolean := False;
627 if External
(Addr_First
) /= '1'
628 or else External
(Addr_First
+ 1) /= '6'
629 or else External
(Addr_First
+ 2) /= '#'
634 for J
in Addr_First
+ 3 .. Addr_Last
- 1 loop
637 if not (C
in '0' .. '9')
638 and then not (C
in 'A' .. 'F')
639 and then not (C
in 'a' .. 'f')
647 -- Convert the numeric value into a tag
649 if not Wrong_Tag
then
650 Addr
:= Integer_Address
'Value
651 (External
(Addr_First
.. Addr_Last
));
653 -- Internal tags never have value 0
656 return To_Tag
(Addr
);
663 -- Handle library-level tagged types
666 -- Make NUL-terminated copy of external tag string
668 Ext_Copy
(External
'Range) := External
;
669 Ext_Copy
(Ext_Copy
'Last) := ASCII
.NUL
;
670 Res
:= External_Tag_HTable
.Get
(Ext_Copy
'Address);
675 Msg1
: constant String := "unknown tagged type: ";
676 Msg2
: String (1 .. Msg1
'Length + External
'Length);
679 Msg2
(1 .. Msg1
'Length) := Msg1
;
680 Msg2
(Msg1
'Length + 1 .. Msg1
'Length + External
'Length) :=
682 Ada
.Exceptions
.Raise_Exception
(Tag_Error
'Identity, Msg2
);
689 ---------------------------------
690 -- Is_Descendant_At_Same_Level --
691 ---------------------------------
693 function Is_Descendant_At_Same_Level
695 Ancestor
: Tag
) return Boolean
697 D_TSD_Ptr
: constant Addr_Ptr
:=
698 To_Addr_Ptr
(To_Address
(Descendant
)
699 - DT_Typeinfo_Ptr_Size
);
700 A_TSD_Ptr
: constant Addr_Ptr
:=
701 To_Addr_Ptr
(To_Address
(Ancestor
) - DT_Typeinfo_Ptr_Size
);
702 D_TSD
: constant Type_Specific_Data_Ptr
:=
703 To_Type_Specific_Data_Ptr
(D_TSD_Ptr
.all);
704 A_TSD
: constant Type_Specific_Data_Ptr
:=
705 To_Type_Specific_Data_Ptr
(A_TSD_Ptr
.all);
708 return CW_Membership
(Descendant
, Ancestor
)
709 and then D_TSD
.Access_Level
= A_TSD
.Access_Level
;
710 end Is_Descendant_At_Same_Level
;
716 function Length
(Str
: Cstring_Ptr
) return Natural is
721 while Str
(Len
) /= ASCII
.NUL
loop
732 function Offset_To_Top
733 (This
: System
.Address
) return SSE
.Storage_Offset
735 Tag_Size
: constant SSE
.Storage_Count
:=
736 SSE
.Storage_Count
(1 * (Standard
'Address_Size / System
.Storage_Unit
));
738 type Storage_Offset_Ptr
is access SSE
.Storage_Offset
;
739 function To_Storage_Offset_Ptr
is
740 new Unchecked_Conversion
(System
.Address
, Storage_Offset_Ptr
);
742 Curr_DT
: Dispatch_Table_Ptr
;
745 Curr_DT
:= DT
(To_Tag_Ptr
(This
).all);
747 if Curr_DT
.Offset_To_Top
= SSE
.Storage_Offset
'Last then
748 return To_Storage_Offset_Ptr
(This
+ Tag_Size
).all;
750 return Curr_DT
.Offset_To_Top
;
759 (Obj
: System
.Address
;
760 T
: Tag
) return SSE
.Storage_Count
762 Parent_Slot
: constant Positive := 1;
763 -- The tag of the parent is always in the first slot of the table of
766 TSD_Ptr
: constant Addr_Ptr
:=
767 To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
768 TSD
: constant Type_Specific_Data_Ptr
:=
769 To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
770 -- Pointer to the TSD
772 Parent_Tag
: constant Tag
:= TSD
.Tags_Table
(Parent_Slot
);
773 Parent_TSD_Ptr
: constant Addr_Ptr
:=
774 To_Addr_Ptr
(To_Address
(Parent_Tag
)
775 - DT_Typeinfo_Ptr_Size
);
776 Parent_TSD
: constant Type_Specific_Data_Ptr
:=
777 To_Type_Specific_Data_Ptr
(Parent_TSD_Ptr
.all);
780 -- Here we compute the size of the _parent field of the object
782 return SSE
.Storage_Count
(Parent_TSD
.Size_Func
.all (Obj
));
789 function Parent_Tag
(T
: Tag
) return Tag
is
791 TSD
: Type_Specific_Data_Ptr
;
798 TSD_Ptr
:= To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
799 TSD
:= To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
801 -- The Parent_Tag of a root-level tagged type is defined to be No_Tag.
802 -- The first entry in the Ancestors_Tags array will be null for such
803 -- a type, but it's better to be explicit about returning No_Tag in
806 if TSD
.Idepth
= 0 then
809 return TSD
.Tags_Table
(1);
813 -------------------------------
814 -- Register_Interface_Offset --
815 -------------------------------
817 procedure Register_Interface_Offset
818 (This
: System
.Address
;
821 Offset_Value
: SSE
.Storage_Offset
;
822 Offset_Func
: Offset_To_Top_Function_Ptr
)
824 Prim_DT
: Dispatch_Table_Ptr
;
825 Iface_Table
: Interface_Data_Ptr
;
828 -- "This" points to the primary DT and we must save Offset_Value in
829 -- the Offset_To_Top field of the corresponding dispatch table.
831 Prim_DT
:= DT
(To_Tag_Ptr
(This
).all);
832 Iface_Table
:= To_Type_Specific_Data_Ptr
(Prim_DT
.TSD
).Interfaces_Table
;
834 -- Save Offset_Value in the table of interfaces of the primary DT.
835 -- This data will be used by the subprogram "Displace" to give support
836 -- to backward abstract interface type conversions.
838 -- Register the offset in the table of interfaces
840 if Iface_Table
/= null then
841 for Id
in 1 .. Iface_Table
.Nb_Ifaces
loop
842 if Iface_Table
.Ifaces_Table
(Id
).Iface_Tag
= Interface_T
then
843 if Is_Static
or else Offset_Value
= 0 then
844 Iface_Table
.Ifaces_Table
(Id
).Static_Offset_To_Top
:= True;
845 Iface_Table
.Ifaces_Table
(Id
).Offset_To_Top_Value
:=
848 Iface_Table
.Ifaces_Table
(Id
).Static_Offset_To_Top
:= False;
849 Iface_Table
.Ifaces_Table
(Id
).Offset_To_Top_Func
:=
858 -- If we arrive here there is some error in the run-time data structure
861 end Register_Interface_Offset
;
867 procedure Register_Tag
(T
: Tag
) is
869 External_Tag_HTable
.Set
(T
);
876 function Secondary_Tag
(T
, Iface
: Tag
) return Tag
is
877 Iface_Table
: Interface_Data_Ptr
;
878 Obj_DT
: Dispatch_Table_Ptr
;
881 if not Is_Primary_DT
(T
) then
886 Iface_Table
:= To_Type_Specific_Data_Ptr
(Obj_DT
.TSD
).Interfaces_Table
;
888 if Iface_Table
/= null then
889 for Id
in 1 .. Iface_Table
.Nb_Ifaces
loop
890 if Iface_Table
.Ifaces_Table
(Id
).Iface_Tag
= Iface
then
891 return Iface_Table
.Ifaces_Table
(Id
).Secondary_DT
;
896 -- If the object does not implement the interface we must raise CE
898 raise Constraint_Error
with "invalid interface conversion";
901 ---------------------
902 -- Set_Entry_Index --
903 ---------------------
905 procedure Set_Entry_Index
911 SSD
(T
).SSD_Table
(Position
).Index
:= Value
;
914 -----------------------
915 -- Set_Offset_To_Top --
916 -----------------------
918 procedure Set_Dynamic_Offset_To_Top
919 (This
: System
.Address
;
921 Offset_Value
: SSE
.Storage_Offset
;
922 Offset_Func
: Offset_To_Top_Function_Ptr
)
924 Sec_Base
: System
.Address
;
925 Sec_DT
: Dispatch_Table_Ptr
;
927 -- Save the offset to top field in the secondary dispatch table
929 if Offset_Value
/= 0 then
930 Sec_Base
:= This
+ Offset_Value
;
931 Sec_DT
:= DT
(To_Tag_Ptr
(Sec_Base
).all);
932 Sec_DT
.Offset_To_Top
:= SSE
.Storage_Offset
'Last;
935 Register_Interface_Offset
936 (This
, Interface_T
, False, Offset_Value
, Offset_Func
);
937 end Set_Dynamic_Offset_To_Top
;
939 ----------------------
940 -- Set_Prim_Op_Kind --
941 ----------------------
943 procedure Set_Prim_Op_Kind
946 Value
: Prim_Op_Kind
)
949 SSD
(T
).SSD_Table
(Position
).Kind
:= Value
;
950 end Set_Prim_Op_Kind
;
952 ----------------------
953 -- Type_Is_Abstract --
954 ----------------------
956 function Type_Is_Abstract
(T
: Tag
) return Boolean is
958 TSD
: Type_Specific_Data_Ptr
;
965 TSD_Ptr
:= To_Addr_Ptr
(To_Address
(T
) - DT_Typeinfo_Ptr_Size
);
966 TSD
:= To_Type_Specific_Data_Ptr
(TSD_Ptr
.all);
967 return TSD
.Type_Is_Abstract
;
968 end Type_Is_Abstract
;
970 ------------------------
971 -- Wide_Expanded_Name --
972 ------------------------
974 WC_Encoding
: Character;
975 pragma Import
(C
, WC_Encoding
, "__gl_wc_encoding");
976 -- Encoding method for source, as exported by binder
978 function Wide_Expanded_Name
(T
: Tag
) return Wide_String is
979 S
: constant String := Expanded_Name
(T
);
980 W
: Wide_String (1 .. S
'Length);
983 String_To_Wide_String
984 (S
, W
, L
, Get_WC_Encoding_Method
(WC_Encoding
));
986 end Wide_Expanded_Name
;
988 -----------------------------
989 -- Wide_Wide_Expanded_Name --
990 -----------------------------
992 function Wide_Wide_Expanded_Name
(T
: Tag
) return Wide_Wide_String
is
993 S
: constant String := Expanded_Name
(T
);
994 W
: Wide_Wide_String
(1 .. S
'Length);
997 String_To_Wide_Wide_String
998 (S
, W
, L
, Get_WC_Encoding_Method
(WC_Encoding
));
1000 end Wide_Wide_Expanded_Name
;