sysdeps/generic/framestate.c

   1 /* __frame_state_for unwinder helper function wrapper.
   2    Copyright (C) 2001, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <dlfcn.h>
  22 #include <stdlib.h>
  23 #define STATIC static
  24 #define __frame_state_for fallback_frame_state_for
  25 #include <unwind-dw2.c>
  26 #undef __frame_state_for
  27 #include <libgcc_s.h>
  28
  29 typedef struct frame_state * (*framesf)(void *pc, struct frame_state *);
  30 struct frame_state *__frame_state_for (void *pc,
  31                                        struct frame_state *frame_state);
  32
  33 struct frame_state *
  34 __frame_state_for (void *pc, struct frame_state *frame_state)
  35 {
  36   static framesf frame_state_for;
  37
  38   if (frame_state_for == NULL)
  39     {
  40       void *handle = __libc_dlopen (LIBGCC_S_SO);
  41
  42       if (handle == NULL
  43           || (frame_state_for
  44               = (framesf) __libc_dlsym (handle, "__frame_state_for")) == NULL)
  45 #ifndef __USING_SJLJ_EXCEPTIONS__
  46         frame_state_for = fallback_frame_state_for;
  47 #else
  48         frame_state_for = abort;
  49 #endif
  50     }
  51
  52   return frame_state_for (pc, frame_state);
  53 }