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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . T R A C E B A C K --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1999-2009, 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the default version of this package
+
+-- Note: this unit must be compiled using -fno-optimize-sibling-calls.
+-- See comment below in body of Call_Chain for details on the reason.
+
+pragma Warnings (Off);
+pragma Compiler_Unit;
+pragma Warnings (On);
+
+package body System.Traceback is
+
+ ------------------
+ -- C_Call_Chain --
+ ------------------
+
+ function C_Call_Chain
+ (Traceback : System.Address;
+ Max_Len : Natural)
+ return Natural
+ is
+ Val : Natural;
+
+ begin
+ Call_Chain (Traceback, Max_Len, Val);
+ return Val;
+ end C_Call_Chain;
+
+ ----------------
+ -- Call_Chain --
+ ----------------
+
+ function Backtrace
+ (Traceback : System.Address;
+ Len : Integer;
+ Exclude_Min : System.Address;
+ Exclude_Max : System.Address;
+ Skip_Frames : Integer)
+ return Integer;
+ pragma Import (C, Backtrace, "__gnat_backtrace");
+
+ procedure Call_Chain
+ (Traceback : System.Address;
+ Max_Len : Natural;
+ Len : out Natural;
+ Exclude_Min : System.Address := System.Null_Address;
+ Exclude_Max : System.Address := System.Null_Address;
+ Skip_Frames : Natural := 1)
+ is
+ begin
+ -- Note: Backtrace relies on the following call actually creating a
+ -- stack frame. To ensure that this is the case, it is essential to
+ -- compile this unit without sibling call optimization.
+
+ -- We want the underlying engine to skip its own frame plus the
+ -- ones we have been requested to skip ourselves.
+
+ Len := Backtrace (Traceback => Traceback,
+ Len => Max_Len,
+ Exclude_Min => Exclude_Min,
+ Exclude_Max => Exclude_Max,
+ Skip_Frames => Skip_Frames + 1);
+ end Call_Chain;
+
+end System.Traceback;