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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [unwind.inc] - Blame information for rev 821

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1 734 jeremybenn
/* Exception handling and frame unwind runtime interface routines. -*- C -*-
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   Copyright (C) 2001, 2003, 2008, 2009 Free Software Foundation, Inc.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GCC is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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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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   .  */
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/* This is derived from the C++ ABI for IA-64.  Where we diverge
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   for cross-architecture compatibility are noted with "@@@".
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   This file is included from unwind-dw2.c, unwind-sjlj.c or
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   unwind-ia64.c.  */
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/* Subroutine of _Unwind_RaiseException also invoked from _Unwind_Resume.
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   Unwind the stack calling the personality routine to find both the
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   exception handler and intermediary cleanup code.  We'll only locate
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   the first such frame here.  Cleanup code will call back into
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   _Unwind_Resume and we'll continue Phase 2 there.  */
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static _Unwind_Reason_Code
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_Unwind_RaiseException_Phase2(struct _Unwind_Exception *exc,
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                              struct _Unwind_Context *context)
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{
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  _Unwind_Reason_Code code;
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  while (1)
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    {
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      _Unwind_FrameState fs;
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      int match_handler;
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      code = uw_frame_state_for (context, &fs);
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      /* Identify when we've reached the designated handler context.  */
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      match_handler = (uw_identify_context (context) == exc->private_2
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                       ? _UA_HANDLER_FRAME : 0);
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      if (code != _URC_NO_REASON)
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        /* Some error encountered.  Usually the unwinder doesn't
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           diagnose these and merely crashes.  */
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        return _URC_FATAL_PHASE2_ERROR;
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      /* Unwind successful.  Run the personality routine, if any.  */
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      if (fs.personality)
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        {
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          code = (*fs.personality) (1, _UA_CLEANUP_PHASE | match_handler,
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                                    exc->exception_class, exc, context);
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          if (code == _URC_INSTALL_CONTEXT)
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            break;
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          if (code != _URC_CONTINUE_UNWIND)
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            return _URC_FATAL_PHASE2_ERROR;
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        }
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      /* Don't let us unwind past the handler context.  */
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      gcc_assert (!match_handler);
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      uw_update_context (context, &fs);
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    }
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  return code;
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}
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/* Raise an exception, passing along the given exception object.  */
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_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_RaiseException(struct _Unwind_Exception *exc)
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{
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  struct _Unwind_Context this_context, cur_context;
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  _Unwind_Reason_Code code;
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  /* Set up this_context to describe the current stack frame.  */
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  uw_init_context (&this_context);
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  cur_context = this_context;
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  /* Phase 1: Search.  Unwind the stack, calling the personality routine
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     with the _UA_SEARCH_PHASE flag set.  Do not modify the stack yet.  */
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  while (1)
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    {
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      _Unwind_FrameState fs;
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      /* Set up fs to describe the FDE for the caller of cur_context.  The
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         first time through the loop, that means __cxa_throw.  */
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      code = uw_frame_state_for (&cur_context, &fs);
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      if (code == _URC_END_OF_STACK)
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        /* Hit end of stack with no handler found.  */
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        return _URC_END_OF_STACK;
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      if (code != _URC_NO_REASON)
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        /* Some error encountered.  Usually the unwinder doesn't
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           diagnose these and merely crashes.  */
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        return _URC_FATAL_PHASE1_ERROR;
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      /* Unwind successful.  Run the personality routine, if any.  */
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      if (fs.personality)
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        {
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          code = (*fs.personality) (1, _UA_SEARCH_PHASE, exc->exception_class,
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                                    exc, &cur_context);
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          if (code == _URC_HANDLER_FOUND)
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            break;
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          else if (code != _URC_CONTINUE_UNWIND)
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            return _URC_FATAL_PHASE1_ERROR;
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        }
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      /* Update cur_context to describe the same frame as fs.  */
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      uw_update_context (&cur_context, &fs);
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    }
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  /* Indicate to _Unwind_Resume and associated subroutines that this
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     is not a forced unwind.  Further, note where we found a handler.  */
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  exc->private_1 = 0;
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  exc->private_2 = uw_identify_context (&cur_context);
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  cur_context = this_context;
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  code = _Unwind_RaiseException_Phase2 (exc, &cur_context);
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  if (code != _URC_INSTALL_CONTEXT)
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    return code;
134
 
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  uw_install_context (&this_context, &cur_context);
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}
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/* Subroutine of _Unwind_ForcedUnwind also invoked from _Unwind_Resume.  */
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141
static _Unwind_Reason_Code
142
_Unwind_ForcedUnwind_Phase2 (struct _Unwind_Exception *exc,
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                             struct _Unwind_Context *context)
144
{
145
  _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) (_Unwind_Ptr) exc->private_1;
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  void *stop_argument = (void *) (_Unwind_Ptr) exc->private_2;
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  _Unwind_Reason_Code code, stop_code;
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149
  while (1)
150
    {
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      _Unwind_FrameState fs;
152
      int action;
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154
      /* Set up fs to describe the FDE for the caller of cur_context.  */
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      code = uw_frame_state_for (context, &fs);
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      if (code != _URC_NO_REASON && code != _URC_END_OF_STACK)
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        return _URC_FATAL_PHASE2_ERROR;
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159
      /* Unwind successful.  */
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      action = _UA_FORCE_UNWIND | _UA_CLEANUP_PHASE;
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      if (code == _URC_END_OF_STACK)
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        action |= _UA_END_OF_STACK;
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      stop_code = (*stop) (1, action, exc->exception_class, exc,
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                           context, stop_argument);
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      if (stop_code != _URC_NO_REASON)
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        return _URC_FATAL_PHASE2_ERROR;
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168
      /* Stop didn't want to do anything.  Invoke the personality
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         handler, if applicable, to run cleanups.  */
170
      if (code == _URC_END_OF_STACK)
171
        break;
172
 
173
      if (fs.personality)
174
        {
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          code = (*fs.personality) (1, _UA_FORCE_UNWIND | _UA_CLEANUP_PHASE,
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                                    exc->exception_class, exc, context);
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          if (code == _URC_INSTALL_CONTEXT)
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            break;
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          if (code != _URC_CONTINUE_UNWIND)
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            return _URC_FATAL_PHASE2_ERROR;
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        }
182
 
183
      /* Update cur_context to describe the same frame as fs, and discard
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         the previous context if necessary.  */
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      uw_advance_context (context, &fs);
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    }
187
 
188
  return code;
189
}
190
 
191
 
192
/* Raise an exception for forced unwinding.  */
193
 
194
_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
195
_Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
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                      _Unwind_Stop_Fn stop, void * stop_argument)
197
{
198
  struct _Unwind_Context this_context, cur_context;
199
  _Unwind_Reason_Code code;
200
 
201
  uw_init_context (&this_context);
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  cur_context = this_context;
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204
  exc->private_1 = (_Unwind_Ptr) stop;
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  exc->private_2 = (_Unwind_Ptr) stop_argument;
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207
  code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
208
  if (code != _URC_INSTALL_CONTEXT)
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    return code;
210
 
211
  uw_install_context (&this_context, &cur_context);
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}
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/* Resume propagation of an existing exception.  This is used after
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   e.g. executing cleanup code, and not to implement rethrowing.  */
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218
void LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_Resume (struct _Unwind_Exception *exc)
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{
221
  struct _Unwind_Context this_context, cur_context;
222
  _Unwind_Reason_Code code;
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224
  uw_init_context (&this_context);
225
  cur_context = this_context;
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227
  /* Choose between continuing to process _Unwind_RaiseException
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     or _Unwind_ForcedUnwind.  */
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  if (exc->private_1 == 0)
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    code = _Unwind_RaiseException_Phase2 (exc, &cur_context);
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  else
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    code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
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  gcc_assert (code == _URC_INSTALL_CONTEXT);
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  uw_install_context (&this_context, &cur_context);
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}
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240
/* Resume propagation of an FORCE_UNWIND exception, or to rethrow
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   a normal exception that was handled.  */
242
 
243
_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
244
_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *exc)
245
{
246
  struct _Unwind_Context this_context, cur_context;
247
  _Unwind_Reason_Code code;
248
 
249
  /* Choose between continuing to process _Unwind_RaiseException
250
     or _Unwind_ForcedUnwind.  */
251
  if (exc->private_1 == 0)
252
    return _Unwind_RaiseException (exc);
253
 
254
  uw_init_context (&this_context);
255
  cur_context = this_context;
256
 
257
  code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
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259
  gcc_assert (code == _URC_INSTALL_CONTEXT);
260
 
261
  uw_install_context (&this_context, &cur_context);
262
}
263
 
264
 
265
/* A convenience function that calls the exception_cleanup field.  */
266
 
267
void
268
_Unwind_DeleteException (struct _Unwind_Exception *exc)
269
{
270
  if (exc->exception_cleanup)
271
    (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
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}
273
 
274
 
275
/* Perform stack backtrace through unwind data.  */
276
 
277
_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
278
_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument)
279
{
280
  struct _Unwind_Context context;
281
  _Unwind_Reason_Code code;
282
 
283
  uw_init_context (&context);
284
 
285
  while (1)
286
    {
287
      _Unwind_FrameState fs;
288
 
289
      /* Set up fs to describe the FDE for the caller of context.  */
290
      code = uw_frame_state_for (&context, &fs);
291
      if (code != _URC_NO_REASON && code != _URC_END_OF_STACK)
292
        return _URC_FATAL_PHASE1_ERROR;
293
 
294
      /* Call trace function.  */
295
      if ((*trace) (&context, trace_argument) != _URC_NO_REASON)
296
        return _URC_FATAL_PHASE1_ERROR;
297
 
298
      /* We're done at end of stack.  */
299
      if (code == _URC_END_OF_STACK)
300
        break;
301
 
302
      /* Update context to describe the same frame as fs.  */
303
      uw_update_context (&context, &fs);
304
    }
305
 
306
  return code;
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}

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