/* libunwind - a platform-independent unwind library
   Copyright (C) 2001-2004 Hewlett-Packard Co
	Contributed by David Mosberger-Tang <address@hidden>

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <errno.h>
#if HAVE_EXECINFO_H
# include <execinfo.h>
#else
  extern int backtrace (void **, int);
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libunwind.h>

#define panic(args...)				\
	{ fprintf (stderr, args); exit (-1); }

#define SIG_STACK_SIZE 0x100000

int verbose = 1;
int num_errors;

/* These variables are global because they
 * cause the signal stack to overflow */
char buf[512], name[256];
unw_cursor_t cursor;
unw_context_t uc;

static void
do_backtrace (void)
{
  unw_word_t ip, sp, off;
  unw_proc_info_t pi;
  int ret;

  if (verbose)
    printf ("\texplicit backtrace:\n");

  unw_getcontext (&uc);
  if (unw_init_local (&cursor, &uc) < 0)
    panic ("unw_init_local failed!\n");

  do
    {
      unw_get_reg (&cursor, UNW_REG_IP, &ip);
      unw_get_reg (&cursor, UNW_REG_SP, &sp);
      buf[0] = '\0';
      if (unw_get_proc_name (&cursor, name, sizeof (name), &off) == 0)
	{
	  if (off)
	    snprintf (buf, sizeof (buf), "unw_get_proc_name: <%s+0x%lx>", name, (long) off);
	  else
	    snprintf (buf, sizeof (buf), "unw_get_proc_name: <%s>", name);
	}
      if (verbose)
	{
	  printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);

	  if (unw_get_proc_info (&cursor, &pi) == 0)
	    {
	      printf ("\tproc=0x%lx-0x%lx\n\thandler=0x%lx lsda=0x%lx gp=0x%lx",
		  (long) pi.start_ip, (long) pi.end_ip,
		  (long) pi.handler, (long) pi.lsda, (long) pi.gp);
	    }

	  printf ("\n");
	}

      ret = unw_step (&cursor);
      if (ret < 0)
	{
	  unw_get_reg (&cursor, UNW_REG_IP, &ip);
	  printf ("FAILURE: unw_step() returned %d for ip=%lx\n",
		  ret, (long) ip);
	  ++num_errors;
	}
    }
  while (ret > 0);
}


void
foo (long val )
{
  printf ("foo (%ld)\n", val);
  do_backtrace ();
}

void
bar (long v)
{
  printf ("bar (%ld)\n", v);
  foo (v);
}

int
main (int argc, char **argv )
{
  bar(123);
  return 0;
}