/* backtrace.c -- Entry point for stack backtrace library.
- Copyright (C) 2012-2015 Free Software Foundation, Inc.
+ Copyright (C) 2012-2020 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
met:
(1) Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
+ notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
- distribution.
-
+ distribution.
+
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
#include "config.h"
+#include <sys/types.h>
+
#include "unwind.h"
#include "backtrace.h"
+#include "internal.h"
/* The main backtrace_full routine. */
void *data;
/* Value to return from backtrace_full. */
int ret;
+ /* Whether there is any memory available. */
+ int can_alloc;
};
/* Unwind library callback routine. This is passed to
if (!ip_before_insn)
--pc;
- bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
- bdata->error_callback, bdata->data);
+ if (!bdata->can_alloc)
+ bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
+ else
+ bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
+ bdata->error_callback, bdata->data);
if (bdata->ret != 0)
return _URC_END_OF_STACK;
/* Get a stack backtrace. */
-int
+int __attribute__((noinline))
backtrace_full (struct backtrace_state *state, int skip,
backtrace_full_callback callback,
backtrace_error_callback error_callback, void *data)
{
struct backtrace_data bdata;
+ void *p;
bdata.skip = skip + 1;
bdata.state = state;
bdata.error_callback = error_callback;
bdata.data = data;
bdata.ret = 0;
+
+ /* If we can't allocate any memory at all, don't try to produce
+ file/line information. */
+ p = backtrace_alloc (state, 4096, NULL, NULL);
+ if (p == NULL)
+ bdata.can_alloc = 0;
+ else
+ {
+ backtrace_free (state, p, 4096, NULL, NULL);
+ bdata.can_alloc = 1;
+ }
+
_Unwind_Backtrace (unwind, &bdata);
return bdata.ret;
}