New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45955 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                       G N A T . T R A C E B A C K                        --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.11 $
+--                                                                          --
+--           Copyright (C) 1999-2000 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
+
+--  This package provides a method for generating a traceback of the
+--  current execution location. The traceback shows the locations of
+--  calls in the call chain, up to either the top or a designated
+--  number of levels.
+
+--  The traceback information is in the form of absolute code locations.
+--  These code locations may be converted to corresponding source locations
+--  using the external addr2line utility, or from within GDB.
+
+--  To analyze the code locations later using addr2line or gdb, the necessary
+--  units must be compiled with the debugging switch -g in the usual manner.
+--  Note that it is not necesary to compile with -g to use Call_Chain. In
+--  other words, the following sequence of steps can be used:
+
+--     Compile without -g
+--     Run the program, and call Call_Chain
+--     Recompile with -g
+--     Use addr2line to interpret the absolute call locations
+
+--  This capability is currently supported on the following targets:
+
+--     All x86 ports
+--     AiX PowerPC
+--     HP-UX
+--     Irix
+--     Solaris sparc
+--     Tru64
+--     VxWorks PowerPC
+--     VxWorks Alpha
+
+with System;
+
+package GNAT.Traceback is
+   pragma Elaborate_Body;
+
+   subtype Code_Loc is System.Address;
+   --  Code location used in building tracebacks
+
+   type Tracebacks_Array is array (Positive range <>) of Code_Loc;
+   --  Traceback array used to hold a generated traceback list.
+
+   ----------------
+   -- Call_Chain --
+   ----------------
+
+   procedure Call_Chain (Traceback : out Tracebacks_Array; Len : out Natural);
+   --  Store up to Traceback'Length tracebacks corresponding to the current
+   --  call chain. The first entry stored corresponds to the deepest level
+   --  of subprogram calls. Len shows the number of traceback entries stored.
+   --  It will be equal to Traceback'Length unless the entire traceback is
+   --  shorter, in which case positions in Traceback past the Len position
+   --  are undefined on return.
+
+end GNAT.Traceback;