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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                     S Y S T E M . T R A C E B A C K                      --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1999-2009, 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 3,  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.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides a method for generating a traceback of the current
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--  execution location. The traceback shows the locations of calls in the call
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--  chain, up to either the top or a designated number of levels.
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pragma Compiler_Unit;
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pragma Polling (Off);
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--  We must turn polling off for this unit, because otherwise we get
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--  elaboration circularities with System.Exception_Tables.
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package System.Traceback is
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   ----------------
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   -- Call_Chain --
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   ----------------
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   procedure Call_Chain
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     (Traceback   : System.Address;
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      Max_Len     : Natural;
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      Len         : out Natural;
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      Exclude_Min : System.Address := System.Null_Address;
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      Exclude_Max : System.Address := System.Null_Address;
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      Skip_Frames : Natural := 1);
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   --  Store up to Max_Len code locations in Traceback, corresponding to
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   --  the current call chain.
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   --
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   --    Traceback is the address of an array of addresses where the
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   --    result will be stored.
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   --
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   --    Max_Len is the length of the Traceback array. If the call chain is
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   --    longer than this, then additional entries are discarded, and the
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   --    traceback is missing some of the highest level entries.
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   --
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   --    Len is the returned number of addresses stored in the Traceback array
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   --
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   --    Exclude_Min/Exclude_Max, if non null, provide a range of addresses
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   --    to ignore from the computation of the traceback.
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   --
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   --    Skip_Frames says how many of the most recent calls should at least
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   --    be excluded from the result, regardless of the exclusion bounds and
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   --    starting with this procedure itself: 1 means exclude the frame for
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   --    this procedure, 2 means 1 + exclude the frame for this procedure's
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   --    caller, ...
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   --
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   --  On return, the Traceback array is filled in, and Len indicates the
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   --  number of stored entries. The first entry is the most recent call,
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   --  and the last entry is the highest level call.
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   function C_Call_Chain
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     (Traceback : System.Address;
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      Max_Len   : Natural)
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      return      Natural;
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   pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");
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   --  Version that can be used directly from C
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end System.Traceback;

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