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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) 1999-2005, 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 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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 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.
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;
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