88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
|
// Copyright (c) 2005 - 2007, Google Inc.
|
||
|
|
// All rights reserved.
|
||
|
|
//
|
||
|
|
// Redistribution and use in source and binary forms, with or without
|
||
|
|
// modification, are permitted provided that the following conditions are
|
||
|
|
// met:
|
||
|
|
//
|
||
|
|
// * Redistributions of source code must retain the above copyright
|
||
|
|
// notice, this list of conditions and the following disclaimer.
|
||
|
|
// * 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.
|
||
|
|
// * Neither the name of Google Inc. nor the names of its
|
||
|
|
// contributors may be used to endorse or promote products derived from
|
||
|
|
// this software without specific prior written permission.
|
||
|
|
//
|
||
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
//
|
||
|
|
// Author: Arun Sharma
|
||
|
|
//
|
||
|
|
// Produce stack trace using libunwind
|
||
|
|
|
||
|
|
#include "utilities.h"
|
||
|
|
|
||
|
|
extern "C" {
|
||
|
|
#define UNW_LOCAL_ONLY
|
||
|
|
#include <libunwind.h>
|
||
|
|
}
|
||
|
|
#include "glog/raw_logging.h"
|
||
|
|
#include "stacktrace.h"
|
||
|
|
|
||
|
|
_START_GOOGLE_NAMESPACE_
|
||
|
|
|
||
|
|
// Sometimes, we can try to get a stack trace from within a stack
|
||
|
|
// trace, because libunwind can call mmap (maybe indirectly via an
|
||
|
|
// internal mmap based memory allocator), and that mmap gets trapped
|
||
|
|
// and causes a stack-trace request. If were to try to honor that
|
||
|
|
// recursive request, we'd end up with infinite recursion or deadlock.
|
||
|
|
// Luckily, it's safe to ignore those subsequent traces. In such
|
||
|
|
// cases, we return 0 to indicate the situation.
|
||
|
|
static bool g_now_entering = false;
|
||
|
|
|
||
|
|
// If you change this function, also change GetStackFrames below.
|
||
|
|
int GetStackTrace(void** result, int max_depth, int skip_count) {
|
||
|
|
void *ip;
|
||
|
|
int n = 0;
|
||
|
|
unw_cursor_t cursor;
|
||
|
|
unw_context_t uc;
|
||
|
|
|
||
|
|
if (sync_val_compare_and_swap(&g_now_entering, false, true)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
unw_getcontext(&uc);
|
||
|
|
RAW_CHECK(unw_init_local(&cursor, &uc) >= 0, "unw_init_local failed");
|
||
|
|
skip_count++; // Do not include the "GetStackTrace" frame
|
||
|
|
|
||
|
|
while (n < max_depth) {
|
||
|
|
int ret = unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip);
|
||
|
|
if (ret < 0)
|
||
|
|
break;
|
||
|
|
if (skip_count > 0) {
|
||
|
|
skip_count--;
|
||
|
|
} else {
|
||
|
|
result[n++] = ip;
|
||
|
|
}
|
||
|
|
ret = unw_step(&cursor);
|
||
|
|
if (ret <= 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
g_now_entering = false;
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
|
||
|
|
_END_GOOGLE_NAMESPACE_
|