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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [tb-gcc.c] - Rev 282
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/**************************************************************************** * * * 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) 2004-2009, 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- * * 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 data structure 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) { char * 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 = (char *) _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 < (char *)uw_data->exclude_min || pc > (char *)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 __attribute__((unused)), int max_len __attribute__((unused)), void * exclude_min __attribute__((unused)), void * exclude_max __attribute__((unused)), int skip_frames __attribute__((unused))) { #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 }
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