| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- G N A T . T R A C E B A C K -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- $Revision$ |
| -- -- |
| -- Copyright (C) 1999-2001 Ada Core Technologies, 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, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Run-time non-symbolic traceback support |
| |
| -- This package provides a method for generating a traceback of the |
| -- current execution location. The traceback shows the locations of |
| -- calls in the call chain, up to either the top or a designated |
| -- number of levels. |
| |
| -- The traceback information is in the form of absolute code locations. |
| -- These code locations may be converted to corresponding source locations |
| -- using the external addr2line utility, or from within GDB. |
| |
| -- To analyze the code locations later using addr2line or gdb, the necessary |
| -- units must be compiled with the debugging switch -g in the usual manner. |
| -- Note that it is not necessary to compile with -g to use Call_Chain. In |
| -- other words, the following sequence of steps can be used: |
| |
| -- Compile without -g |
| -- Run the program, and call Call_Chain |
| -- Recompile with -g |
| -- Use addr2line to interpret the absolute call locations |
| |
| -- This capability is currently supported on the following targets: |
| |
| -- All x86 ports |
| -- AiX PowerPC |
| -- HP-UX |
| -- Irix |
| -- Solaris sparc |
| -- Tru64 |
| -- VxWorks PowerPC |
| -- VxWorks Alpha |
| |
| with System; |
| |
| package GNAT.Traceback is |
| pragma Elaborate_Body; |
| |
| subtype Code_Loc is System.Address; |
| -- Code location used in building tracebacks |
| |
| type Tracebacks_Array is array (Positive range <>) of Code_Loc; |
| -- Traceback array used to hold a generated traceback list. |
| |
| ---------------- |
| -- Call_Chain -- |
| ---------------- |
| |
| procedure Call_Chain (Traceback : out Tracebacks_Array; Len : out Natural); |
| -- Store up to Traceback'Length tracebacks corresponding to the current |
| -- call chain. The first entry stored corresponds to the deepest level |
| -- of subprogram calls. Len shows the number of traceback entries stored. |
| -- It will be equal to Traceback'Length unless the entire traceback is |
| -- shorter, in which case positions in Traceback past the Len position |
| -- are undefined on return. |
| |
| end GNAT.Traceback; |
