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Diffstat (limited to 'gcc/ada/i-cpp.ads')
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diff --git a/gcc/ada/i-cpp.ads b/gcc/ada/i-cpp.ads new file mode 100644 index 00000000000..86d6673c431 --- /dev/null +++ b/gcc/ada/i-cpp.ads @@ -0,0 +1,195 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- I N T E R F A C E S . C P P -- +-- -- +-- S p e c -- +-- -- +-- $Revision: 1.12 $ +-- -- +-- Copyright (C) 1992-2000, 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +-- Definitions for interfacing to C++ classes + +with System; +with System.Storage_Elements; + +package Interfaces.CPP is + + package S renames System; + package SSE renames System.Storage_Elements; + + -- This package corresponds to Ada.Tags but applied to tagged types + -- which are 'imported' from C++ and correspond to exactly to a C++ + -- Class. GNAT doesn't know about the structure od the C++ dispatch + -- table (Vtable) but always access it through the procedural interface + -- defined below, 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. + + type Vtable_Ptr is private; + + function Expanded_Name (T : Vtable_Ptr) return String; + function External_Tag (T : Vtable_Ptr) return String; + +private + + 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 + (2 * (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 + (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. + + 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) + + type Vtable; + type Vtable_Ptr is access all Vtable; + + 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); + +end Interfaces.CPP; |