1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- I N T E R F A C E S . C P P --
9 -- Copyright (C) 1992-2002, 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 -- 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 ------------------------------------------------------------------------------
34 with Ada.Tags; use Ada.Tags;
35 with Interfaces.C; use Interfaces.C;
36 with System; use System;
37 with System.Storage_Elements; use System.Storage_Elements;
38 with Unchecked_Conversion;
40 package body Interfaces.CPP is
42 subtype Cstring is String (Positive);
43 type Cstring_Ptr is access all Cstring;
44 type Tag_Table is array (Natural range <>) of Vtable_Ptr;
45 pragma Suppress_Initialization (Tag_Table);
47 type Type_Specific_Data is record
49 Expanded_Name : Cstring_Ptr;
50 External_Tag : Cstring_Ptr;
52 Ancestor_Tags : Tag_Table (Natural);
55 type Vtable_Entry is record
59 type Type_Specific_Data_Ptr is access all Type_Specific_Data;
60 type Vtable_Entry_Array is array (Positive range <>) of Vtable_Entry;
65 TSD : Type_Specific_Data_Ptr;
66 Prims_Ptr : Vtable_Entry_Array (Positive);
69 --------------------------------------------------------
70 -- Unchecked Conversions for Tag, Vtable_Ptr, and TSD --
71 --------------------------------------------------------
73 function To_Type_Specific_Data_Ptr is
74 new Unchecked_Conversion (Address, Type_Specific_Data_Ptr);
76 function To_Address is
77 new Unchecked_Conversion (Type_Specific_Data_Ptr, Address);
79 ---------------------------------------------
80 -- Unchecked Conversions for String Fields --
81 ---------------------------------------------
83 function To_Cstring_Ptr is
84 new Unchecked_Conversion (Address, Cstring_Ptr);
86 function To_Address is
87 new Unchecked_Conversion (Cstring_Ptr, Address);
89 -----------------------
90 -- Local Subprograms --
91 -----------------------
93 function Length (Str : Cstring_Ptr) return Natural;
94 -- Length of string represented by the given pointer (treating the
95 -- string as a C-style string, which is Nul terminated).
97 -----------------------
98 -- CPP_CW_Membership --
99 -----------------------
101 function CPP_CW_Membership
102 (Obj_Tag : Vtable_Ptr;
103 Typ_Tag : Vtable_Ptr)
106 Pos : constant Integer := Obj_Tag.TSD.Idepth - Typ_Tag.TSD.Idepth;
108 return Pos >= 0 and then Obj_Tag.TSD.Ancestor_Tags (Pos) = Typ_Tag;
109 end CPP_CW_Membership;
111 ---------------------------
112 -- CPP_Get_Expanded_Name --
113 ---------------------------
115 function CPP_Get_Expanded_Name (T : Vtable_Ptr) return Address is
117 return To_Address (T.TSD.Expanded_Name);
118 end CPP_Get_Expanded_Name;
120 --------------------------
121 -- CPP_Get_External_Tag --
122 --------------------------
124 function CPP_Get_External_Tag (T : Vtable_Ptr) return Address is
126 return To_Address (T.TSD.External_Tag);
127 end CPP_Get_External_Tag;
129 -------------------------------
130 -- CPP_Get_Inheritance_Depth --
131 -------------------------------
133 function CPP_Get_Inheritance_Depth (T : Vtable_Ptr) return Natural is
136 end CPP_Get_Inheritance_Depth;
138 -------------------------
139 -- CPP_Get_Prim_Op_Address --
140 -------------------------
142 function CPP_Get_Prim_Op_Address
147 return T.Prims_Ptr (Position).Pfn;
148 end CPP_Get_Prim_Op_Address;
150 -----------------------
151 -- CPP_Get_RC_Offset --
152 -----------------------
154 function CPP_Get_RC_Offset (T : Vtable_Ptr) return SSE.Storage_Offset is
155 pragma Warnings (Off, T);
159 end CPP_Get_RC_Offset;
161 -------------------------------
162 -- CPP_Get_Remotely_Callable --
163 -------------------------------
165 function CPP_Get_Remotely_Callable (T : Vtable_Ptr) return Boolean is
166 pragma Warnings (Off, T);
170 end CPP_Get_Remotely_Callable;
176 function CPP_Get_TSD (T : Vtable_Ptr) return Address is
178 return To_Address (T.TSD);
185 procedure CPP_Inherit_DT
188 Entry_Count : Natural)
191 if Old_T /= null then
192 New_T.Prims_Ptr (1 .. Entry_Count)
193 := Old_T.Prims_Ptr (1 .. Entry_Count);
197 ---------------------
198 -- CPP_Inherit_TSD --
199 ---------------------
201 procedure CPP_Inherit_TSD
203 New_Tag : Vtable_Ptr)
205 TSD : constant Type_Specific_Data_Ptr
206 := To_Type_Specific_Data_Ptr (Old_TSD);
208 New_TSD : Type_Specific_Data renames New_Tag.TSD.all;
212 New_TSD.Idepth := TSD.Idepth + 1;
213 New_TSD.Ancestor_Tags (1 .. New_TSD.Idepth)
214 := TSD.Ancestor_Tags (0 .. TSD.Idepth);
219 New_TSD.Ancestor_Tags (0) := New_Tag;
222 ---------------------------
223 -- CPP_Set_Expanded_Name --
224 ---------------------------
226 procedure CPP_Set_Expanded_Name (T : Vtable_Ptr; Value : Address) is
228 T.TSD.Expanded_Name := To_Cstring_Ptr (Value);
229 end CPP_Set_Expanded_Name;
231 --------------------------
232 -- CPP_Set_External_Tag --
233 --------------------------
235 procedure CPP_Set_External_Tag (T : Vtable_Ptr; Value : Address) is
237 T.TSD.External_Tag := To_Cstring_Ptr (Value);
238 end CPP_Set_External_Tag;
240 -------------------------------
241 -- CPP_Set_Inheritance_Depth --
242 -------------------------------
244 procedure CPP_Set_Inheritance_Depth
249 T.TSD.Idepth := Value;
250 end CPP_Set_Inheritance_Depth;
252 -----------------------------
253 -- CPP_Set_Prim_Op_Address --
254 -----------------------------
256 procedure CPP_Set_Prim_Op_Address
262 T.Prims_Ptr (Position).Pfn := Value;
263 end CPP_Set_Prim_Op_Address;
265 -----------------------
266 -- CPP_Set_RC_Offset --
267 -----------------------
269 procedure CPP_Set_RC_Offset (T : Vtable_Ptr; Value : SSE.Storage_Offset) is
270 pragma Warnings (Off, T);
271 pragma Warnings (Off, Value);
275 end CPP_Set_RC_Offset;
277 -------------------------------
278 -- CPP_Set_Remotely_Callable --
279 -------------------------------
281 procedure CPP_Set_Remotely_Callable (T : Vtable_Ptr; Value : Boolean) is
282 pragma Warnings (Off, T);
283 pragma Warnings (Off, Value);
287 end CPP_Set_Remotely_Callable;
293 procedure CPP_Set_TSD (T : Vtable_Ptr; Value : Address) is
295 T.TSD := To_Type_Specific_Data_Ptr (Value);
302 function Displaced_This
303 (Current_This : System.Address;
306 return System.Address
308 pragma Warnings (Off, Vptr);
309 pragma Warnings (Off, Position);
314 -- why is the following here commented out ???
315 -- + Storage_Offset (Vptr.Prims_Ptr (Position).Delta1);
322 function Expanded_Name (T : Vtable_Ptr) return String is
323 Result : constant Cstring_Ptr := T.TSD.Expanded_Name;
326 return Result (1 .. Length (Result));
333 function External_Tag (T : Vtable_Ptr) return String is
334 Result : constant Cstring_Ptr := T.TSD.External_Tag;
337 return Result (1 .. Length (Result));
344 function Length (Str : Cstring_Ptr) return Natural is
348 while Str (Len) /= ASCII.Nul loop