| /**************************************************************************** |
| * * |
| * GNAT COMPILER COMPONENTS * |
| * * |
| * T R A C E B A C K - G C C t a b l e s * |
| * * |
| * C Implementation File * |
| * * |
| * Copyright (C) 2004-2007, AdaCore * |
| * * |
| * 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 you link this file with other files to * |
| * produce an executable, this file does not by itself cause the resulting * |
| * executable to be covered by the GNU General Public License. This except- * |
| * ion 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 an implementation of the __gnat_backtrace routine using the |
| underlying GCC unwinding support associated with the exception handling |
| infrastructure. This will only work for ZCX based applications. */ |
| |
| #include <unwind.h> |
| |
| /* The implementation boils down to a call to _Unwind_Backtrace with a |
| tailored callback and carried-on datastructure to keep track of the |
| input parameters we got as well as of the basic processing state. */ |
| |
| /****************** |
| * trace_callback * |
| ******************/ |
| |
| #if !defined (__USING_SJLJ_EXCEPTIONS__) |
| |
| typedef struct { |
| void ** traceback; |
| int max_len; |
| void * exclude_min; |
| void * exclude_max; |
| int n_frames_to_skip; |
| int n_frames_skipped; |
| int n_entries_filled; |
| } uw_data_t; |
| |
| #if defined (__ia64__) && defined (__hpux__) |
| #include <uwx.h> |
| #endif |
| |
| static _Unwind_Reason_Code |
| trace_callback (struct _Unwind_Context * uw_context, uw_data_t * uw_data) |
| { |
| void * pc; |
| |
| #if defined (__ia64__) && defined (__hpux__) |
| /* Work around problem with _Unwind_GetIP on ia64 HP-UX. */ |
| uwx_get_reg ((struct uwx_env *) uw_context, UWX_REG_IP, (uint64_t *) &pc); |
| #else |
| pc = (void *) _Unwind_GetIP (uw_context); |
| #endif |
| |
| if (uw_data->n_frames_skipped < uw_data->n_frames_to_skip) |
| { |
| uw_data->n_frames_skipped ++; |
| return _URC_NO_REASON; |
| } |
| |
| if (uw_data->n_entries_filled >= uw_data->max_len) |
| return _URC_NORMAL_STOP; |
| |
| if (pc < uw_data->exclude_min || pc > uw_data->exclude_max) |
| uw_data->traceback [uw_data->n_entries_filled ++] = pc + PC_ADJUST; |
| |
| return _URC_NO_REASON; |
| } |
| |
| #endif |
| |
| /******************** |
| * __gnat_backtrace * |
| ********************/ |
| |
| int |
| __gnat_backtrace (void ** traceback, int max_len, |
| void * exclude_min, void * exclude_max, |
| int skip_frames) |
| { |
| #if defined (__USING_SJLJ_EXCEPTIONS__) |
| /* We have no unwind material (tables) at hand with sjlj eh, and no |
| way to retrieve complete and accurate call chain information from |
| the context stack we maintain. */ |
| return 0; |
| #else |
| uw_data_t uw_data; |
| /* State carried over during the whole unwinding process. */ |
| |
| uw_data.traceback = traceback; |
| uw_data.max_len = max_len; |
| uw_data.exclude_min = exclude_min; |
| uw_data.exclude_max = exclude_max; |
| |
| uw_data.n_frames_to_skip = skip_frames; |
| |
| uw_data.n_frames_skipped = 0; |
| uw_data.n_entries_filled = 0; |
| |
| _Unwind_Backtrace ((_Unwind_Trace_Fn)trace_callback, &uw_data); |
| |
| return uw_data.n_entries_filled; |
| #endif |
| } |