sysdeps/generic/framestate.c

   1 /* __frame_state_for unwinder helper function wrapper.
   2    Copyright (C) 2001-2018 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <dlfcn.h>
  21 #include <stdlib.h>
  22 #define STATIC static
  23 #define __frame_state_for fallback_frame_state_for
  24 #include <unwind-dw2.c>
  25 #undef __frame_state_for
  26 #include <gnu/lib-names.h>
  27
  28 typedef struct frame_state * (*framesf)(void *pc, struct frame_state *);
  29 struct frame_state *__frame_state_for (void *pc,
  30                                        struct frame_state *frame_state);
  31
  32 struct frame_state *
  33 __frame_state_for (void *pc, struct frame_state *frame_state)
  34 {
  35   static framesf frame_state_for;
  36
  37   if (frame_state_for == NULL)
  38     {
  39       void *handle = __libc_dlopen (LIBGCC_S_SO);
  40
  41       if (handle == NULL
  42           || (frame_state_for
  43               = (framesf) __libc_dlsym (handle, "__frame_state_for")) == NULL)
  44 #ifndef __USING_SJLJ_EXCEPTIONS__
  45         frame_state_for = fallback_frame_state_for;
  46 #else
  47         frame_state_for = abort;
  48 #endif
  49     }
  50
  51   return frame_state_for (pc, frame_state);
  52 }