File : g-traceb.adb
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . T R A C E B A C K --
-- --
-- B o d y --
-- --
-- $Revision: 1.2 $
-- --
-- Copyright (C) 1999 Ada Core Technologies, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- Run-time non-symbolic traceback support
with System.Storage_Elements;
package body GNAT.Traceback is
use System;
use System.Storage_Elements;
function Machine_State_Length return Storage_Offset;
pragma Import (C, Machine_State_Length, "__gnat_machine_state_length");
type Machine_State is new Storage_Array (1 .. Machine_State_Length);
for Machine_State'Alignment use Standard'Maximum_Alignment;
type Machine_State_Ptr is access all Machine_State;
procedure Set_Machine_State (M : Machine_State_Ptr);
pragma Import (C, Set_Machine_State, "__gnat_set_machine_state");
procedure Pop_Frame (M : Machine_State_Ptr);
pragma Import (C, Pop_Frame, "__gnat_pop_frame");
function Get_Code_Loc (M : Machine_State_Ptr) return Code_Loc;
pragma Import (C, Get_Code_Loc, "__gnat_get_code_loc");
----------------
-- Call_Chain --
----------------
procedure Call_Chain
(Traceback : out Tracebacks_Array;
Len : out Integer)
is
M : aliased Machine_State;
Code : Code_Loc;
J : Natural := Traceback'First;
begin
Set_Machine_State (M'Unchecked_Access);
Pop_Frame (M'Unchecked_Access);
loop
Code := Get_Code_Loc (M'Unchecked_Access);
exit when Code = Null_Address or else J = Traceback'Last + 1;
Traceback (J) := Code;
J := J + 1;
Pop_Frame (M'Unchecked_Access);
end loop;
Len := J - Traceback'First;
end Call_Chain;
end GNAT.Traceback;