------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- I N T E R F A C E S . C P P --
-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2005, 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- --
-- 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. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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, --
-- --
------------------------------------------------------------------------------
--- Definitions for interfacing to C++ classes
+-- Missing package comment ???
--- This package corresponds to Ada.Tags but applied to tagged types which are
--- are imported from C++ and correspond exactly to a C++ Class. The code that
--- the GNAT front end generates does not know about the structure of the C++
--- dispatch table (Vtable) but always accesses it through the procedural
--- interface defined in this package, thus the implementation of this package
--- (the body) can be customized to another C++ compiler without any change in
--- the compiler code itself as long as this procedural interface is respected.
--- Note that Ada.Tags defines a very similar procedural interface to the
--- regular Ada Dispatch Table.
-
-with System;
-with System.Storage_Elements;
+with Ada.Tags;
package Interfaces.CPP is
+ pragma Elaborate_Body;
+ -- We have a dummy body to deal with bootstrap path issues
- package S renames System;
- package SSE renames System.Storage_Elements;
-
- type Vtable_Ptr is private;
-
- function Expanded_Name (T : Vtable_Ptr) return String;
- function External_Tag (T : Vtable_Ptr) return String;
-
-private
- -- These subprograms are in the private part. They are never accessed
- -- directly except from compiler generated code, which has access to
- -- private components of packages via the Rtsfind interface.
-
- procedure CPP_Set_Prim_Op_Address
- (T : Vtable_Ptr;
- Position : Positive;
- Value : S.Address);
- -- Given a pointer to a dispatch Table (T) and a position in the
- -- dispatch Table put the address of the virtual function in it
- -- (used for overriding)
-
- function CPP_Get_Prim_Op_Address
- (T : Vtable_Ptr;
- Position : Positive)
- return S.Address;
- -- Given a pointer to a dispatch Table (T) and a position in the DT
- -- this function returns the address of the virtual function stored
- -- in it (used for dispatching calls)
-
- procedure CPP_Set_Inheritance_Depth
- (T : Vtable_Ptr;
- Value : Natural);
- -- Given a pointer to a dispatch Table, stores the value representing
- -- the depth in the inheritance tree. Used during elaboration of the
- -- tagged type.
-
- function CPP_Get_Inheritance_Depth (T : Vtable_Ptr) return Natural;
- -- Given a pointer to a dispatch Table, retreives the value representing
- -- the depth in the inheritance tree. Used for membership.
-
- procedure CPP_Set_TSD (T : Vtable_Ptr; Value : S.Address);
- -- Given a pointer T to a dispatch Table, stores the address of the
- -- record containing the Type Specific Data generated by GNAT
-
- function CPP_Get_TSD (T : Vtable_Ptr) return S.Address;
- -- Given a pointer T to a dispatch Table, retreives the address of the
- -- record containing the Type Specific Data generated by GNAT
-
- CPP_DT_Prologue_Size : constant SSE.Storage_Count :=
- SSE.Storage_Count
- (1 * (Standard'Address_Size / S.Storage_Unit));
- -- Size of the first part of the dispatch table
-
- CPP_DT_Entry_Size : constant SSE.Storage_Count :=
- SSE.Storage_Count
- (1 * (Standard'Address_Size / S.Storage_Unit));
- -- Size of each primitive operation entry in the Dispatch Table.
-
- CPP_TSD_Prologue_Size : constant SSE.Storage_Count :=
- SSE.Storage_Count
- (4 * (Standard'Address_Size / S.Storage_Unit));
- -- Size of the first part of the type specific data
-
- CPP_TSD_Entry_Size : constant SSE.Storage_Count :=
- SSE.Storage_Count
- (1 * (Standard'Address_Size / S.Storage_Unit));
- -- Size of each ancestor tag entry in the TSD
-
- procedure CPP_Inherit_DT
- (Old_T : Vtable_Ptr;
- New_T : Vtable_Ptr;
- Entry_Count : Natural);
- -- Entry point used to initialize the DT of a type knowing the
- -- tag of the direct ancestor and the number of primitive ops that are
- -- inherited (Entry_Count).
-
- procedure CPP_Inherit_TSD
- (Old_TSD : S.Address;
- New_Tag : Vtable_Ptr);
- -- Entry point used to initialize the TSD of a type knowing the
- -- TSD of the direct ancestor.
-
- function CPP_CW_Membership (Obj_Tag, Typ_Tag : Vtable_Ptr) return Boolean;
- -- Given the tag of an object and the tag associated to a type, return
- -- true if Obj is in Typ'Class.
-
- procedure CPP_Set_External_Tag (T : Vtable_Ptr; Value : S.Address);
- -- Set the address of the string containing the external tag
- -- in the Dispatch table
-
- function CPP_Get_External_Tag (T : Vtable_Ptr) return S.Address;
- -- Retrieve the address of a null terminated string containing
- -- the external name
-
- procedure CPP_Set_Expanded_Name (T : Vtable_Ptr; Value : S.Address);
- -- Set the address of the string containing the expanded name
- -- in the Dispatch table
-
- function CPP_Get_Expanded_Name (T : Vtable_Ptr) return S.Address;
- -- Retrieve the address of a null terminated string containing
- -- the expanded name
-
- procedure CPP_Set_Remotely_Callable (T : Vtable_Ptr; Value : Boolean);
- -- Since the notions of spec/body distinction and categorized packages
- -- do not exist in C, this procedure will do nothing
-
- function CPP_Get_Remotely_Callable (T : Vtable_Ptr) return Boolean;
- -- This function will always return True for the reason explained above
-
- procedure CPP_Set_RC_Offset (T : Vtable_Ptr; Value : SSE.Storage_Offset);
- -- Sets the Offset of the implicit record controller when the object
- -- has controlled components. Set to O otherwise.
-
- function CPP_Get_RC_Offset (T : Vtable_Ptr) return SSE.Storage_Offset;
- -- Return the Offset of the implicit record controller when the object
- -- has controlled components. O otherwise.
+ subtype Vtable_Ptr is Ada.Tags.Tag;
- function Displaced_This
- (Current_This : S.Address;
- Vptr : Vtable_Ptr;
- Position : Positive)
- return S.Address;
- -- Compute the displacement on the "this" pointer in order to be
- -- compatible with MI.
- -- (used for virtual function calls)
+ -- These need commenting (this is not an RM package!)
- type Vtable;
- type Vtable_Ptr is access all Vtable;
+ function Expanded_Name (T : Vtable_Ptr) return String
+ renames Ada.Tags.Expanded_Name;
- pragma Inline (CPP_Set_Prim_Op_Address);
- pragma Inline (CPP_Get_Prim_Op_Address);
- pragma Inline (CPP_Set_Inheritance_Depth);
- pragma Inline (CPP_Get_Inheritance_Depth);
- pragma Inline (CPP_Set_TSD);
- pragma Inline (CPP_Get_TSD);
- pragma Inline (CPP_Inherit_DT);
- pragma Inline (CPP_CW_Membership);
- pragma Inline (CPP_Set_External_Tag);
- pragma Inline (CPP_Get_External_Tag);
- pragma Inline (CPP_Set_Expanded_Name);
- pragma Inline (CPP_Get_Expanded_Name);
- pragma Inline (CPP_Set_Remotely_Callable);
- pragma Inline (CPP_Get_Remotely_Callable);
- pragma Inline (Displaced_This);
+ function External_Tag (T : Vtable_Ptr) return String
+ renames Ada.Tags.External_Tag;
end Interfaces.CPP;
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