#define CAN_FORK (defined(HAVE_FORK) && defined(HAVE_EXECVP) \
&& defined(HAVE_WAIT))
#define GLIBC_BACKTRACE (defined(HAVE_BACKTRACE) \
- && defined(HAVE_BACKTRACE_SYMBOLS))
+ && defined(HAVE_BACKTRACE_SYMBOLS_FD))
#define CAN_PIPE (CAN_FORK && defined(HAVE_PIPE) \
&& defined(HAVE_DUP2) && defined(HAVE_FDOPEN) \
&& defined(HAVE_CLOSE))
-#if GLIBC_BACKTRACE && CAN_PIPE
-static char *
-local_strcasestr (const char *s1, const char *s2)
-{
-#ifdef HAVE_STRCASESTR
- return strcasestr (s1, s2);
-#else
+/* GDB style #NUM index for each stack frame. */
- const char *p = s1;
- const size_t len = strlen (s2);
- const char u = *s2, v = isupper((int) *s2) ? tolower((int) *s2)
- : (islower((int) *s2) ? toupper((int) *s2)
- : *s2);
-
- while (1)
- {
- while (*p != u && *p != v && *p)
- p++;
- if (*p == 0)
- return NULL;
- if (strncasecmp (p, s2, len) == 0)
- return (char *)p;
- }
-#endif
+static void
+bt_header (int num)
+{
+ st_printf (" #%d ", num);
}
-#endif
-#if GLIBC_BACKTRACE
-static void
-dump_glibc_backtrace (int depth, char *str[])
-{
- int i;
+/* fgets()-like function that reads a line from a fd, without
+ needing to malloc() a buffer, and does not use locks, hence should
+ be async-signal-safe. */
- for (i = 0; i < depth; i++)
+static char *
+fd_gets (char *s, int size, int fd)
+{
+ for (int i = 0; i < size; i++)
{
- estr_write (" + ");
- estr_write (str[i]);
- estr_write ("\n");
+ char c;
+ ssize_t nread = read (fd, &c, 1);
+ if (nread == 1)
+ {
+ s[i] = c;
+ if (c == '\n')
+ {
+ if (i + 1 < size)
+ s[i+1] = '\0';
+ else
+ s[i] = '\0';
+ break;
+ }
+ }
+ else
+ {
+ s[i] = '\0';
+ break;
+ }
}
-
- free (str);
+ return s;
}
-#endif
+
/* show_backtrace displays the backtrace, currently obtained by means of
the glibc backtrace* functions. */
+
void
show_backtrace (void)
{
#define BUFSIZE 1024
void *trace[DEPTH];
- char **str;
int depth;
depth = backtrace (trace, DEPTH);
if (depth <= 0)
return;
- str = backtrace_symbols (trace, depth);
-
#if CAN_PIPE
-#ifndef STDIN_FILENO
-#define STDIN_FILENO 0
-#endif
-
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO 1
-#endif
-
-#ifndef STDERR_FILENO
-#define STDERR_FILENO 2
-#endif
-
/* We attempt to extract file and line information from addr2line. */
do
{
/* Local variables. */
- int f[2], pid, line, i;
- FILE *output;
- char addr_buf[DEPTH][GFC_XTOA_BUF_SIZE], func[BUFSIZE], file[BUFSIZE];
- char *p, *end;
- const char *addr[DEPTH];
-
- /* Write the list of addresses in hexadecimal format. */
- for (i = 0; i < depth; i++)
- addr[i] = gfc_xtoa ((GFC_UINTEGER_LARGEST) (intptr_t) trace[i], addr_buf[i],
- sizeof (addr_buf[i]));
+ int f[2], pid, bt[2], inp[2];
+ char addr_buf[GFC_XTOA_BUF_SIZE], func[BUFSIZE], file[BUFSIZE];
+ char *p;
/* Don't output an error message if something goes wrong, we'll simply
fall back to the pstack and glibc backtraces. */
if (pipe (f) != 0)
break;
+ if (pipe (inp) != 0)
+ break;
if ((pid = fork ()) == -1)
break;
if (pid == 0)
{
/* Child process. */
-#define NUM_FIXEDARGS 5
- char *arg[DEPTH+NUM_FIXEDARGS+1];
+#define NUM_FIXEDARGS 7
+ char *arg[NUM_FIXEDARGS];
close (f[0]);
- close (STDIN_FILENO);
+
+ close (inp[1]);
+ if (dup2 (inp[0], STDIN_FILENO) == -1)
+ _exit (1);
+ close (inp[0]);
+
close (STDERR_FILENO);
if (dup2 (f[1], STDOUT_FILENO) == -1)
- _exit (0);
+ _exit (1);
close (f[1]);
arg[0] = (char *) "addr2line";
arg[2] = full_exe_path ();
arg[3] = (char *) "-f";
arg[4] = (char *) "-s";
- for (i = 0; i < depth; i++)
- arg[NUM_FIXEDARGS+i] = (char *) addr[i];
- arg[NUM_FIXEDARGS+depth] = NULL;
+ arg[5] = (char *) "-C";
+ arg[6] = NULL;
execvp (arg[0], arg);
- _exit (0);
+ _exit (1);
#undef NUM_FIXEDARGS
}
/* Father process. */
close (f[1]);
- wait (NULL);
- output = fdopen (f[0], "r");
- i = -1;
+ close (inp[0]);
+ if (pipe (bt) != 0)
+ break;
+ backtrace_symbols_fd (trace, depth, bt[1]);
+ close (bt[1]);
- if (fgets (func, sizeof(func), output))
+ estr_write ("\nBacktrace for this error:\n");
+ for (int j = 0; j < depth; j++)
{
- estr_write ("\nBacktrace for this error:\n");
-
- do
+ const char *addr = gfc_xtoa
+ ((GFC_UINTEGER_LARGEST) (intptr_t) trace[j],
+ addr_buf, sizeof (addr_buf));
+
+ write (inp[1], addr, strlen (addr));
+ write (inp[1], "\n", 1);
+
+ if (! fd_gets (func, sizeof(func), f[0]))
+ goto fallback;
+ if (! fd_gets (file, sizeof(file), f[0]))
+ goto fallback;
+
+ for (p = func; *p != '\n' && *p != '\r'; p++)
+ ;
+ *p = '\0';
+
+ /* If we only have the address, use the glibc backtrace. */
+ if (func[0] == '?' && func[1] == '?' && file[0] == '?'
+ && file[1] == '?')
{
- if (! fgets (file, sizeof(file), output))
- goto fallback;
-
- i++;
-
- for (p = func; *p != '\n' && *p != '\r'; p++)
- ;
-
- *p = '\0';
-
- /* Try to recognize the internal libgfortran functions. */
- if (strncasecmp (func, "*_gfortran", 10) == 0
- || strncasecmp (func, "_gfortran", 9) == 0
- || strcmp (func, "main") == 0 || strcmp (func, "_start") == 0
- || strcmp (func, "_gfortrani_backtrace_handler") == 0)
- continue;
-
- if (local_strcasestr (str[i], "libgfortran.so") != NULL
- || local_strcasestr (str[i], "libgfortran.dylib") != NULL
- || local_strcasestr (str[i], "libgfortran.a") != NULL)
- continue;
-
- /* If we only have the address, use the glibc backtrace. */
- if (func[0] == '?' && func[1] == '?' && file[0] == '?'
- && file[1] == '?')
- {
- estr_write (" + ");
- estr_write (str[i]);
- estr_write ("\n");
- continue;
- }
-
- /* Extract the line number. */
- for (end = NULL, p = file; *p; p++)
- if (*p == ':')
- end = p;
- if (end != NULL)
- {
- *end = '\0';
- line = atoi (++end);
- }
- else
- line = -1;
-
- if (strcmp (func, "MAIN__") == 0)
- estr_write (" + in the main program\n");
- else
+ bt_header (j);
+ while (1)
{
- estr_write (" + function ");
- estr_write (func);
- estr_write (" (0x");
- estr_write (addr[i]);
- estr_write (")\n");
+ char bc;
+ ssize_t nread = read (bt[0], &bc, 1);
+ if (nread != 1 || bc == '\n')
+ break;
+ write (STDERR_FILENO, &bc, 1);
}
-
- if (line <= 0 && strcmp (file, "??") == 0)
- continue;
-
- if (line <= 0)
+ estr_write ("\n");
+ continue;
+ }
+ else
+ {
+ /* Forward to the next entry in the backtrace. */
+ while (1)
{
- estr_write (" from file ");
- estr_write (file);
- estr_write ("\n");
+ char bc;
+ ssize_t nread = read (bt[0], &bc, 1);
+ if (nread != 1 || bc == '\n')
+ break;
}
- else
- st_printf (" at line %d of file %s\n", line, file);
}
- while (fgets (func, sizeof(func), output));
- free (str);
- return;
+ /* _start is a setup routine that calls main(), and main() is
+ the frontend routine that calls some setup stuff and then
+ calls MAIN__, so at this point we should stop. */
+ if (strcmp (func, "_start") == 0 || strcmp (func, "main") == 0)
+ break;
+
+ bt_header (j);
+ estr_write (full_exe_path ());
+ estr_write ("[0x");
+ estr_write (addr);
+ estr_write ("] in ");
+ estr_write (func);
+
+ if (strncmp (file, "??", 2) == 0)
+ estr_write ("\n");
+ else
+ {
+ estr_write (" at ");
+ estr_write (file);
+ }
+ } /* Loop over each hex address. */
+ close (inp[1]);
+ close (bt[0]);
+ wait (NULL);
+ return;
fallback:
- estr_write ("** Something went wrong while running addr2line. **\n"
- "** Falling back to a simpler backtrace scheme. **\n");
- }
- }
+ estr_write ("** Something went wrong while running addr2line. **\n"
+ "** Falling back to a simpler backtrace scheme. **\n");
+ }
while (0);
#undef DEPTH
#undef BUFSIZE
-#endif
-#endif
+#endif /* CAN_PIPE */
+
+ /* Fallback to the glibc backtrace. */
+ estr_write ("\nBacktrace for this error:\n");
+ backtrace_symbols_fd (trace, depth, STDERR_FILENO);
+ return;
-#if CAN_FORK && defined(HAVE_GETPPID)
+#elif defined(CAN_FORK) && defined(HAVE_GETPPID)
/* Try to call pstack. */
do
{
execvp (arg[0], arg);
#undef NUM_ARGS
- /* pstack didn't work, so we fall back to dumping the glibc
- backtrace if we can. */
-#if GLIBC_BACKTRACE
- dump_glibc_backtrace (depth, str);
-#else
+ /* pstack didn't work. */
estr_write (" unable to produce a backtrace, sorry!\n");
-#endif
-
- _exit (0);
+ _exit (1);
}
/* Father process. */
return;
}
while(0);
-#endif
-
-#if GLIBC_BACKTRACE
- /* Fallback to the glibc backtrace. */
- estr_write ("\nBacktrace for this error:\n");
- dump_glibc_backtrace (depth, str);
- return;
-#endif
+#else
estr_write ("\nBacktrace not yet available on this platform, sorry!\n");
+#endif
}
projects / gcc.git / commitdiff