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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgfortran/] [runtime/] [backtrace.c] - Blame information for rev 867

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1 733 jeremybenn
/* Copyright (C) 2006, 2007, 2009, 2011, 2012 Free Software Foundation, Inc.
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   Contributed by François-Xavier Coudert
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify
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it 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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11
Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public 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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<http://www.gnu.org/licenses/>.  */
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#include "libgfortran.h"
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#include <string.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <limits.h>
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#include "unwind.h"
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/* Macros for common sets of capabilities: can we fork and exec, and
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   can we use pipes to communicate with the subprocess.  */
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#define CAN_FORK (defined(HAVE_FORK) && defined(HAVE_EXECVE) \
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                  && defined(HAVE_WAIT))
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#define CAN_PIPE (CAN_FORK && defined(HAVE_PIPE) \
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                  && defined(HAVE_DUP2) && defined(HAVE_CLOSE))
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#ifndef PATH_MAX
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#define PATH_MAX 4096
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#endif
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/* GDB style #NUM index for each stack frame.  */
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static void
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bt_header (int num)
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{
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  st_printf ("#%d  ", num);
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}
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/* fgets()-like function that reads a line from a fd, without
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   needing to malloc() a buffer, and does not use locks, hence should
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   be async-signal-safe.  */
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static char *
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fd_gets (char *s, int size, int fd)
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{
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  for (int i = 0; i < size; i++)
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    {
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      char c;
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      ssize_t nread = read (fd, &c, 1);
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      if (nread == 1)
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        {
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          s[i] = c;
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          if (c == '\n')
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            {
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              if (i + 1 < size)
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                s[i+1] = '\0';
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              else
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                s[i] = '\0';
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              break;
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            }
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        }
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      else
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        {
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          s[i] = '\0';
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          if (i == 0)
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            return NULL;
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          break;
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        }
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    }
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  return s;
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}
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extern char *addr2line_path;
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/* Struct containing backtrace state.  */
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typedef struct
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{
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  int frame_number;
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  int direct_output;
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  int outfd;
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  int infd;
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  int error;
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}
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bt_state;
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static _Unwind_Reason_Code
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trace_function (struct _Unwind_Context *context, void *state_ptr)
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{
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  bt_state* state = (bt_state*) state_ptr;
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  _Unwind_Ptr ip;
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#ifdef HAVE_GETIPINFO
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  int ip_before_insn = 0;
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  ip = _Unwind_GetIPInfo (context, &ip_before_insn);
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  /* If the unwinder gave us a 'return' address, roll it back a little
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     to ensure we get the correct line number for the call itself.  */
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  if (! ip_before_insn)
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    --ip;
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#else  
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  ip = _Unwind_GetIP (context);
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#endif
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  if (state->direct_output)
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    {
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      bt_header(state->frame_number);
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      st_printf ("%p\n", (void*) ip);
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    }
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  else
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    {
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      char addr_buf[GFC_XTOA_BUF_SIZE], func[1024], file[PATH_MAX];
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      char *p;
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      const char* addr = gfc_xtoa (ip, addr_buf, sizeof (addr_buf));
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      write (state->outfd, addr, strlen (addr));
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      write (state->outfd, "\n", 1);
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      if (! fd_gets (func, sizeof(func), state->infd))
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        {
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          state->error = 1;
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          goto done;
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        }
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      if (! fd_gets (file, sizeof(file), state->infd))
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        {
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          state->error = 1;
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          goto done;
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        }
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        for (p = func; *p != '\n' && *p != '\r'; p++)
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          ;
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        *p = '\0';
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        /* _start is a setup routine that calls main(), and main() is
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           the frontend routine that calls some setup stuff and then
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           calls MAIN__, so at this point we should stop.  */
160
        if (strcmp (func, "_start") == 0 || strcmp (func, "main") == 0)
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          return _URC_END_OF_STACK;
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163
        bt_header (state->frame_number);
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        estr_write ("0x");
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        estr_write (addr);
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167
        if (func[0] != '?' && func[1] != '?')
168
          {
169
            estr_write (" in ");
170
            estr_write (func);
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          }
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173
        if (strncmp (file, "??", 2) == 0)
174
          estr_write ("\n");
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        else
176
          {
177
            estr_write (" at ");
178
            estr_write (file);
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          }
180
    }
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182
 done:
183
 
184
  state->frame_number++;
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186
  return _URC_NO_REASON;
187
}
188
 
189
 
190
/* Display the backtrace.  */
191
 
192
void
193
show_backtrace (void)
194
{
195
  bt_state state;
196
  state.frame_number = 0;
197
  state.error = 0;
198
 
199
  estr_write ("\nBacktrace for this error:\n");
200
 
201
#if CAN_PIPE
202
 
203
  if (addr2line_path == NULL)
204
    goto fallback_noerr;
205
 
206
  /* We attempt to extract file and line information from addr2line.  */
207
  do
208
  {
209
    /* Local variables.  */
210
    int f[2], pid, inp[2];
211
 
212
    /* Don't output an error message if something goes wrong, we'll simply
213
       fall back to printing the addresses.  */
214
    if (pipe (f) != 0)
215
      break;
216
    if (pipe (inp) != 0)
217
      break;
218
    if ((pid = fork ()) == -1)
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      break;
220
 
221
    if (pid == 0)
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      {
223
        /* Child process.  */
224
#define NUM_FIXEDARGS 7
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        char *arg[NUM_FIXEDARGS];
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        char *newenv[] = { NULL };
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228
        close (f[0]);
229
 
230
        close (inp[1]);
231
        if (dup2 (inp[0], STDIN_FILENO) == -1)
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          _exit (1);
233
        close (inp[0]);
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235
        close (STDERR_FILENO);
236
 
237
        if (dup2 (f[1], STDOUT_FILENO) == -1)
238
          _exit (1);
239
        close (f[1]);
240
 
241
        arg[0] = addr2line_path;
242
        arg[1] = (char *) "-e";
243
        arg[2] = full_exe_path ();
244
        arg[3] = (char *) "-f";
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        arg[4] = (char *) "-s";
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        arg[5] = (char *) "-C";
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        arg[6] = NULL;
248
        execve (addr2line_path, arg, newenv);
249
        _exit (1);
250
#undef NUM_FIXEDARGS
251
      }
252
 
253
    /* Father process.  */
254
    close (f[1]);
255
    close (inp[0]);
256
 
257
    state.outfd = inp[1];
258
    state.infd = f[0];
259
    state.direct_output = 0;
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    _Unwind_Backtrace (trace_function, &state);
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    if (state.error)
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      goto fallback;
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    close (inp[1]);
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    wait (NULL);
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    return;
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267
fallback:
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    estr_write ("** Something went wrong while running addr2line. **\n"
269
                "** Falling back to a simpler backtrace scheme. **\n");
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  }
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  while (0);
272
 
273
#endif /* CAN_PIPE */
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275
fallback_noerr:
276
  /* Fallback to the simple backtrace without addr2line.  */
277
  state.direct_output = 1;
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  _Unwind_Backtrace (trace_function, &state);
279
}

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