------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- I N T E R F A C E S . C P P -- -- -- -- B o d y -- -- -- -- -- -- Copyright (C) 1992-2002, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 2, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Ada.Tags; use Ada.Tags; with Interfaces.C; use Interfaces.C; with System; use System; with System.Storage_Elements; use System.Storage_Elements; with Unchecked_Conversion; package body Interfaces.CPP is subtype Cstring is String (Positive); type Cstring_Ptr is access all Cstring; type Tag_Table is array (Natural range <>) of Vtable_Ptr; pragma Suppress_Initialization (Tag_Table); type Type_Specific_Data is record Idepth : Natural; Expanded_Name : Cstring_Ptr; External_Tag : Cstring_Ptr; HT_Link : Tag; Ancestor_Tags : Tag_Table (Natural); end record; type Vtable_Entry is record Pfn : System.Address; end record; type Type_Specific_Data_Ptr is access all Type_Specific_Data; type Vtable_Entry_Array is array (Positive range <>) of Vtable_Entry; type VTable is record Unused1 : C.short; Unused2 : C.short; TSD : Type_Specific_Data_Ptr; Prims_Ptr : Vtable_Entry_Array (Positive); end record; -------------------------------------------------------- -- Unchecked Conversions for Tag, Vtable_Ptr, and TSD -- -------------------------------------------------------- function To_Type_Specific_Data_Ptr is new Unchecked_Conversion (Address, Type_Specific_Data_Ptr); function To_Address is new Unchecked_Conversion (Type_Specific_Data_Ptr, Address); --------------------------------------------- -- Unchecked Conversions for String Fields -- --------------------------------------------- function To_Cstring_Ptr is new Unchecked_Conversion (Address, Cstring_Ptr); function To_Address is new Unchecked_Conversion (Cstring_Ptr, Address); ----------------------- -- Local Subprograms -- ----------------------- function Length (Str : Cstring_Ptr) return Natural; -- Length of string represented by the given pointer (treating the -- string as a C-style string, which is Nul terminated). ----------------------- -- CPP_CW_Membership -- ----------------------- function CPP_CW_Membership (Obj_Tag : Vtable_Ptr; Typ_Tag : Vtable_Ptr) return Boolean is Pos : constant Integer := Obj_Tag.TSD.Idepth - Typ_Tag.TSD.Idepth; begin return Pos >= 0 and then Obj_Tag.TSD.Ancestor_Tags (Pos) = Typ_Tag; end CPP_CW_Membership; --------------------------- -- CPP_Get_Expanded_Name -- --------------------------- function CPP_Get_Expanded_Name (T : Vtable_Ptr) return Address is begin return To_Address (T.TSD.Expanded_Name); end CPP_Get_Expanded_Name; -------------------------- -- CPP_Get_External_Tag -- -------------------------- function CPP_Get_External_Tag (T : Vtable_Ptr) return Address is begin return To_Address (T.TSD.External_Tag); end CPP_Get_External_Tag; ------------------------------- -- CPP_Get_Inheritance_Depth -- ------------------------------- function CPP_Get_Inheritance_Depth (T : Vtable_Ptr) return Natural is begin return T.TSD.Idepth; end CPP_Get_Inheritance_Depth; ------------------------- -- CPP_Get_Prim_Op_Address -- ------------------------- function CPP_Get_Prim_Op_Address (T : Vtable_Ptr; Position : Positive) return Address is begin return T.Prims_Ptr (Position).Pfn; end CPP_Get_Prim_Op_Address; ----------------------- -- CPP_Get_RC_Offset -- ----------------------- function CPP_Get_RC_Offset (T : Vtable_Ptr) return SSE.Storage_Offset is pragma Warnings (Off, T); begin return 0; end CPP_Get_RC_Offset; ------------------------------- -- CPP_Get_Remotely_Callable -- ------------------------------- function CPP_Get_Remotely_Callable (T : Vtable_Ptr) return Boolean is pragma Warnings (Off, T); begin return True; end CPP_Get_Remotely_Callable; ----------------- -- CPP_Get_TSD -- ----------------- function CPP_Get_TSD (T : Vtable_Ptr) return Address is begin return To_Address (T.TSD); end CPP_Get_TSD; -------------------- -- CPP_Inherit_DT -- -------------------- procedure CPP_Inherit_DT (Old_T : Vtable_Ptr; New_T : Vtable_Ptr; Entry_Count : Natural) is begin if Old_T /= null then New_T.Prims_Ptr (1 .. Entry_Count) := Old_T.Prims_Ptr (1 .. Entry_Count); end if; end CPP_Inherit_DT; --------------------- -- CPP_Inherit_TSD -- --------------------- procedure CPP_Inherit_TSD (Old_TSD : Address; New_Tag : Vtable_Ptr) is TSD : constant Type_Specific_Data_Ptr := To_Type_Specific_Data_Ptr (Old_TSD); New_TSD : Type_Specific_Data renames New_Tag.TSD.all; begin if TSD /= null then New_TSD.Idepth := TSD.Idepth + 1; New_TSD.Ancestor_Tags (1 .. New_TSD.Idepth) := TSD.Ancestor_Tags (0 .. TSD.Idepth); else New_TSD.Idepth := 0; end if; New_TSD.Ancestor_Tags (0) := New_Tag; end CPP_Inherit_TSD; --------------------------- -- CPP_Set_Expanded_Name -- --------------------------- procedure CPP_Set_Expanded_Name (T : Vtable_Ptr; Value : Address) is begin T.TSD.Expanded_Name := To_Cstring_Ptr (Value); end CPP_Set_Expanded_Name; -------------------------- -- CPP_Set_External_Tag -- -------------------------- procedure CPP_Set_External_Tag (T : Vtable_Ptr; Value : Address) is begin T.TSD.External_Tag := To_Cstring_Ptr (Value); end CPP_Set_External_Tag; ------------------------------- -- CPP_Set_Inheritance_Depth -- ------------------------------- procedure CPP_Set_Inheritance_Depth (T : Vtable_Ptr; Value : Natural) is begin T.TSD.Idepth := Value; end CPP_Set_Inheritance_Depth; ----------------------------- -- CPP_Set_Prim_Op_Address -- ----------------------------- procedure CPP_Set_Prim_Op_Address (T : Vtable_Ptr; Position : Positive; Value : Address) is begin T.Prims_Ptr (Position).Pfn := Value; end CPP_Set_Prim_Op_Address; ----------------------- -- CPP_Set_RC_Offset -- ----------------------- procedure CPP_Set_RC_Offset (T : Vtable_Ptr; Value : SSE.Storage_Offset) is pragma Warnings (Off, T); pragma Warnings (Off, Value); begin null; end CPP_Set_RC_Offset; ------------------------------- -- CPP_Set_Remotely_Callable -- ------------------------------- procedure CPP_Set_Remotely_Callable (T : Vtable_Ptr; Value : Boolean) is pragma Warnings (Off, T); pragma Warnings (Off, Value); begin null; end CPP_Set_Remotely_Callable; ----------------- -- CPP_Set_TSD -- ----------------- procedure CPP_Set_TSD (T : Vtable_Ptr; Value : Address) is begin T.TSD := To_Type_Specific_Data_Ptr (Value); end CPP_Set_TSD; -------------------- -- Displaced_This -- -------------------- function Displaced_This (Current_This : System.Address; Vptr : Vtable_Ptr; Position : Positive) return System.Address is pragma Warnings (Off, Vptr); pragma Warnings (Off, Position); begin return Current_This; -- why is the following here commented out ??? -- + Storage_Offset (Vptr.Prims_Ptr (Position).Delta1); end Displaced_This; ------------------- -- Expanded_Name -- ------------------- function Expanded_Name (T : Vtable_Ptr) return String is Result : Cstring_Ptr := T.TSD.Expanded_Name; begin return Result (1 .. Length (Result)); end Expanded_Name; ------------------ -- External_Tag -- ------------------ function External_Tag (T : Vtable_Ptr) return String is Result : Cstring_Ptr := T.TSD.External_Tag; begin return Result (1 .. Length (Result)); end External_Tag; ------------ -- Length -- ------------ function Length (Str : Cstring_Ptr) return Natural is Len : Integer := 1; begin while Str (Len) /= ASCII.Nul loop Len := Len + 1; end loop; return Len - 1; end Length; end Interfaces.CPP;