348 lines
11 KiB
Ada
348 lines
11 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- I N T E R F A C E S . C P P --
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-- --
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-- B o d y --
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-- --
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-- $Revision: 1.19 $
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-- --
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-- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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with Ada.Tags; use Ada.Tags;
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with Interfaces.C; use Interfaces.C;
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with System; use System;
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with System.Storage_Elements; use System.Storage_Elements;
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with Unchecked_Conversion;
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package body Interfaces.CPP is
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subtype Cstring is String (Positive);
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type Cstring_Ptr is access all Cstring;
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type Tag_Table is array (Natural range <>) of Vtable_Ptr;
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pragma Suppress_Initialization (Tag_Table);
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type Type_Specific_Data is record
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Idepth : Natural;
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Expanded_Name : Cstring_Ptr;
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External_Tag : Cstring_Ptr;
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HT_Link : Tag;
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Ancestor_Tags : Tag_Table (Natural);
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end record;
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type Vtable_Entry is record
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Pfn : System.Address;
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end record;
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type Type_Specific_Data_Ptr is access all Type_Specific_Data;
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type Vtable_Entry_Array is array (Positive range <>) of Vtable_Entry;
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type VTable is record
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Unused1 : C.short;
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Unused2 : C.short;
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TSD : Type_Specific_Data_Ptr;
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Prims_Ptr : Vtable_Entry_Array (Positive);
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end record;
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--------------------------------------------------------
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-- Unchecked Conversions for Tag, Vtable_Ptr, and TSD --
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--------------------------------------------------------
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function To_Type_Specific_Data_Ptr is
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new Unchecked_Conversion (Address, Type_Specific_Data_Ptr);
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function To_Address is new Unchecked_Conversion (Vtable_Ptr, Address);
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function To_Address is
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new Unchecked_Conversion (Type_Specific_Data_Ptr, Address);
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function To_Vtable_Ptr is new Unchecked_Conversion (Tag, Vtable_Ptr);
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function To_Tag is new Unchecked_Conversion (Vtable_Ptr, Tag);
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---------------------------------------------
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-- Unchecked Conversions for String Fields --
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---------------------------------------------
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function To_Cstring_Ptr is
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new Unchecked_Conversion (Address, Cstring_Ptr);
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function To_Address is
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new Unchecked_Conversion (Cstring_Ptr, Address);
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Length (Str : Cstring_Ptr) return Natural;
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-- Length of string represented by the given pointer (treating the
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-- string as a C-style string, which is Nul terminated).
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-----------------------
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-- CPP_CW_Membership --
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-----------------------
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function CPP_CW_Membership
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(Obj_Tag : Vtable_Ptr;
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Typ_Tag : Vtable_Ptr)
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return Boolean
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is
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Pos : constant Integer := Obj_Tag.TSD.Idepth - Typ_Tag.TSD.Idepth;
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begin
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return Pos >= 0 and then Obj_Tag.TSD.Ancestor_Tags (Pos) = Typ_Tag;
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end CPP_CW_Membership;
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---------------------------
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-- CPP_Get_Expanded_Name --
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---------------------------
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function CPP_Get_Expanded_Name (T : Vtable_Ptr) return Address is
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begin
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return To_Address (T.TSD.Expanded_Name);
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end CPP_Get_Expanded_Name;
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--------------------------
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-- CPP_Get_External_Tag --
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--------------------------
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function CPP_Get_External_Tag (T : Vtable_Ptr) return Address is
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begin
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return To_Address (T.TSD.External_Tag);
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end CPP_Get_External_Tag;
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-------------------------------
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-- CPP_Get_Inheritance_Depth --
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-------------------------------
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function CPP_Get_Inheritance_Depth (T : Vtable_Ptr) return Natural is
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begin
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return T.TSD.Idepth;
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end CPP_Get_Inheritance_Depth;
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-------------------------
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-- CPP_Get_Prim_Op_Address --
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-------------------------
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function CPP_Get_Prim_Op_Address
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(T : Vtable_Ptr;
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Position : Positive)
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return Address is
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begin
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return T.Prims_Ptr (Position).Pfn;
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end CPP_Get_Prim_Op_Address;
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-----------------------
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-- CPP_Get_RC_Offset --
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-----------------------
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function CPP_Get_RC_Offset (T : Vtable_Ptr) return SSE.Storage_Offset is
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begin
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return 0;
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end CPP_Get_RC_Offset;
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-------------------------------
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-- CPP_Get_Remotely_Callable --
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-------------------------------
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function CPP_Get_Remotely_Callable (T : Vtable_Ptr) return Boolean is
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begin
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return True;
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end CPP_Get_Remotely_Callable;
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-----------------
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-- CPP_Get_TSD --
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-----------------
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function CPP_Get_TSD (T : Vtable_Ptr) return Address is
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begin
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return To_Address (T.TSD);
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end CPP_Get_TSD;
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--------------------
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-- CPP_Inherit_DT --
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--------------------
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procedure CPP_Inherit_DT
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(Old_T : Vtable_Ptr;
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New_T : Vtable_Ptr;
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Entry_Count : Natural)
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is
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begin
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if Old_T /= null then
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New_T.Prims_Ptr (1 .. Entry_Count)
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:= Old_T.Prims_Ptr (1 .. Entry_Count);
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end if;
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end CPP_Inherit_DT;
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---------------------
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-- CPP_Inherit_TSD --
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---------------------
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procedure CPP_Inherit_TSD
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(Old_TSD : Address;
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New_Tag : Vtable_Ptr)
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is
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TSD : constant Type_Specific_Data_Ptr
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:= To_Type_Specific_Data_Ptr (Old_TSD);
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New_TSD : Type_Specific_Data renames New_Tag.TSD.all;
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begin
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if TSD /= null then
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New_TSD.Idepth := TSD.Idepth + 1;
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New_TSD.Ancestor_Tags (1 .. New_TSD.Idepth)
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:= TSD.Ancestor_Tags (0 .. TSD.Idepth);
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else
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New_TSD.Idepth := 0;
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end if;
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New_TSD.Ancestor_Tags (0) := New_Tag;
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end CPP_Inherit_TSD;
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---------------------------
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-- CPP_Set_Expanded_Name --
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---------------------------
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procedure CPP_Set_Expanded_Name (T : Vtable_Ptr; Value : Address) is
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begin
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T.TSD.Expanded_Name := To_Cstring_Ptr (Value);
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end CPP_Set_Expanded_Name;
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--------------------------
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-- CPP_Set_External_Tag --
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--------------------------
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procedure CPP_Set_External_Tag (T : Vtable_Ptr; Value : Address) is
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begin
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T.TSD.External_Tag := To_Cstring_Ptr (Value);
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end CPP_Set_External_Tag;
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-------------------------------
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-- CPP_Set_Inheritance_Depth --
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-------------------------------
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procedure CPP_Set_Inheritance_Depth
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(T : Vtable_Ptr;
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Value : Natural)
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is
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begin
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T.TSD.Idepth := Value;
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end CPP_Set_Inheritance_Depth;
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-----------------------------
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-- CPP_Set_Prim_Op_Address --
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-----------------------------
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procedure CPP_Set_Prim_Op_Address
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(T : Vtable_Ptr;
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Position : Positive;
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Value : Address)
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is
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begin
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T.Prims_Ptr (Position).Pfn := Value;
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end CPP_Set_Prim_Op_Address;
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-----------------------
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-- CPP_Set_RC_Offset --
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-----------------------
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procedure CPP_Set_RC_Offset (T : Vtable_Ptr; Value : SSE.Storage_Offset) is
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begin
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null;
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end CPP_Set_RC_Offset;
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-------------------------------
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-- CPP_Set_Remotely_Callable --
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-------------------------------
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procedure CPP_Set_Remotely_Callable (T : Vtable_Ptr; Value : Boolean) is
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begin
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null;
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end CPP_Set_Remotely_Callable;
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-----------------
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-- CPP_Set_TSD --
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-----------------
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procedure CPP_Set_TSD (T : Vtable_Ptr; Value : Address) is
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begin
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T.TSD := To_Type_Specific_Data_Ptr (Value);
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end CPP_Set_TSD;
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--------------------
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-- Displaced_This --
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--------------------
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function Displaced_This
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(Current_This : System.Address;
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Vptr : Vtable_Ptr;
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Position : Positive)
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return System.Address
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is
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begin
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return Current_This;
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-- why is the following here commented out ???
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-- + Storage_Offset (Vptr.Prims_Ptr (Position).Delta1);
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end Displaced_This;
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-------------------
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-- Expanded_Name --
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-------------------
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function Expanded_Name (T : Vtable_Ptr) return String is
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Result : Cstring_Ptr := T.TSD.Expanded_Name;
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begin
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return Result (1 .. Length (Result));
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end Expanded_Name;
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------------------
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-- External_Tag --
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------------------
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function External_Tag (T : Vtable_Ptr) return String is
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Result : Cstring_Ptr := T.TSD.External_Tag;
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begin
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return Result (1 .. Length (Result));
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end External_Tag;
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------------
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-- Length --
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------------
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function Length (Str : Cstring_Ptr) return Natural is
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Len : Integer := 1;
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begin
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while Str (Len) /= ASCII.Nul loop
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Len := Len + 1;
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end loop;
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return Len - 1;
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end Length;
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end Interfaces.CPP;
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