2ed5b74848
2012-07-12 Javier Miranda <miranda@adacore.com> * exp_ch3.adb (Make_Neq_Body): Fix typo in comment. 2012-07-12 Eric Botcazou <ebotcazou@adacore.com> * tb-gcc.c (trace_callback): On IA-64/HP-UX, use workaround only if USE_LIBUNWIND_EXCEPTIONS is defined. * init.c: Further tweaks for IA-64/HP-UX. 2012-07-12 Tristan Gingold <gingold@adacore.com> * raise-gcc.c: Do not include unwind-dw2-fde.h. Adjust comments. (db_region_for): Second argument is ip. Do not recompute ip. (action_kind): Remove typedef, add unhandler enum const. (action_descriptor): Adjust type of kind field. (db_action_for): Second argument is ip, do not recompute it. (get_call_site_action_for): First argument is call_site, do not recompute it. Remove useless return. (is_handled_by): Now return enum action_kind. Handle GNAT_ALL_OTHERS first. Return unhandler for GNAT_UNHANDLED_OTHERS. (get_action_description_for): First argument is now ip, do not recompute it. Adjust code for call to is_handled_by. (__gnat_notify_unhandled_exception): Add prototype. (PERSONALITY_FUNCTION): Call get_ip_from_context. Adjust calls. Handle unhandler case. (__gnat_cleanupunwind_handler): Add comments, add ATTRIBUTE_UNUSED on arguments. (__gnat_Unwind_RaiseException, __gnat_Unwind_ForcedUnwind): Define only once. * raise.h: Makes struct Exception_Data opaque. From-SVN: r189433
126 lines
4.9 KiB
C
126 lines
4.9 KiB
C
/****************************************************************************
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* *
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* GNAT RUN-TIME COMPONENTS *
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* *
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* T R A C E B A C K - G C C t a b l e s *
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* *
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* C Implementation File *
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* *
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* Copyright (C) 2004-2012, Free Software Foundation, Inc. *
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* *
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* GNAT is free software; you can redistribute it and/or modify it under *
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* terms of the GNU General Public License as published by the Free Soft- *
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* ware Foundation; either version 3, or (at your option) any later ver- *
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* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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* or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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* As a special exception under Section 7 of GPL version 3, you are granted *
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* additional permissions described in the GCC Runtime Library Exception, *
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* version 3.1, as published by the Free Software Foundation. *
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* *
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* You should have received a copy of the GNU General Public License and *
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* a copy of the GCC Runtime Library Exception along with this program; *
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
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* <http://www.gnu.org/licenses/>. *
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* *
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* GNAT was originally developed by the GNAT team at New York University. *
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* Extensive contributions were provided by Ada Core Technologies Inc. *
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* *
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****************************************************************************/
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/* This is an implementation of the __gnat_backtrace routine using the
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underlying GCC unwinding support associated with the exception handling
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infrastructure. This will only work for ZCX based applications. */
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#include <unwind.h>
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/* The implementation boils down to a call to _Unwind_Backtrace with a
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tailored callback and carried-on data structure to keep track of the
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input parameters we got as well as of the basic processing state. */
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/******************
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* trace_callback *
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******************/
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#if !defined (__USING_SJLJ_EXCEPTIONS__)
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typedef struct {
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void ** traceback;
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int max_len;
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void * exclude_min;
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void * exclude_max;
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int n_frames_to_skip;
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int n_frames_skipped;
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int n_entries_filled;
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} uw_data_t;
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#if defined (__ia64__) && defined (__hpux__)
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#include <uwx.h>
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#endif
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static _Unwind_Reason_Code
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trace_callback (struct _Unwind_Context * uw_context, uw_data_t * uw_data)
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{
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char * pc;
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#if defined (__ia64__) && defined (__hpux__) && defined (USE_LIBUNWIND_EXCEPTIONS)
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/* Work around problem with _Unwind_GetIP on ia64 HP-UX. */
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uwx_get_reg ((struct uwx_env *) uw_context, UWX_REG_IP, (uint64_t *) &pc);
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#else
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pc = (char *) _Unwind_GetIP (uw_context);
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#endif
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if (uw_data->n_frames_skipped < uw_data->n_frames_to_skip)
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{
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uw_data->n_frames_skipped ++;
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return _URC_NO_REASON;
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}
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if (uw_data->n_entries_filled >= uw_data->max_len)
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return _URC_NORMAL_STOP;
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if (pc < (char *)uw_data->exclude_min || pc > (char *)uw_data->exclude_max)
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uw_data->traceback [uw_data->n_entries_filled ++] = pc + PC_ADJUST;
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return _URC_NO_REASON;
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}
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#endif
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/********************
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* __gnat_backtrace *
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********************/
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int
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__gnat_backtrace (void ** traceback __attribute__((unused)),
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int max_len __attribute__((unused)),
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void * exclude_min __attribute__((unused)),
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void * exclude_max __attribute__((unused)),
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int skip_frames __attribute__((unused)))
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{
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#if defined (__USING_SJLJ_EXCEPTIONS__)
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/* We have no unwind material (tables) at hand with sjlj eh, and no
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way to retrieve complete and accurate call chain information from
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the context stack we maintain. */
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return 0;
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#else
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uw_data_t uw_data;
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/* State carried over during the whole unwinding process. */
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uw_data.traceback = traceback;
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uw_data.max_len = max_len;
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uw_data.exclude_min = exclude_min;
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uw_data.exclude_max = exclude_max;
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uw_data.n_frames_to_skip = skip_frames;
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uw_data.n_frames_skipped = 0;
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uw_data.n_entries_filled = 0;
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_Unwind_Backtrace ((_Unwind_Trace_Fn)trace_callback, &uw_data);
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return uw_data.n_entries_filled;
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#endif
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}
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