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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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-- B o d y --
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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 is the default version of this package
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-- Note: this unit must be compiled using -fno-optimize-sibling-calls.
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-- See comment below in body of Call_Chain for details on the reason.
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pragma Compiler_Unit;
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package body System.Traceback is
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------------------
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-- C_Call_Chain --
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------------------
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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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is
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Val : Natural;
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begin
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Call_Chain (Traceback, Max_Len, Val);
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return Val;
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end C_Call_Chain;
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----------------
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-- Call_Chain --
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----------------
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function Backtrace
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(Traceback : System.Address;
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Len : Integer;
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Exclude_Min : System.Address;
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Exclude_Max : System.Address;
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Skip_Frames : Integer)
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return Integer;
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pragma Import (C, Backtrace, "__gnat_backtrace");
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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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is
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begin
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-- Note: Backtrace relies on the following call actually creating a
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-- stack frame. To ensure that this is the case, it is essential to
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-- compile this unit without sibling call optimization.
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-- We want the underlying engine to skip its own frame plus the
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-- ones we have been requested to skip ourselves.
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Len := Backtrace (Traceback => Traceback,
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Len => Max_Len,
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Exclude_Min => Exclude_Min,
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Exclude_Max => Exclude_Max,
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Skip_Frames => Skip_Frames + 1);
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end Call_Chain;
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end System.Traceback;
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