-- --
-- B o d y --
-- --
--- $Revision$
--- --
--- Copyright (C) 1999-2001 Free Software Foundation, Inc. --
+-- 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 2, or (at your option) any later ver- --
+-- 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. 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. --
+-- 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. --
-- --
--- 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. --
+-- 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- 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 Compiler_Unit;
+
package body System.Traceback is
------------------
(Traceback : System.Address;
Len : Integer;
Exclude_Min : System.Address;
- Exclude_Max : 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,
- Exclude_Max : System.Address := System.Null_Address)
+ (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
- Len := Backtrace (Traceback, Max_Len, Exclude_Min, Exclude_Max);
+ -- 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;
OSDN Git Service
