a00ca9b038
git-svn-id: https://google-glog.googlecode.com/svn/trunk@18 eb4d4688-79bd-11dd-afb4-1d65580434c0
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
// Copyright 2005 - 2007 Google Inc.
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// All rights reserved.
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//
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// Author: Arun Sharma
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//
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// Produce stack trace using libunwind
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#include "utilities.h"
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extern "C" {
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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}
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#include "glog/raw_logging.h"
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#include "stacktrace.h"
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_START_GOOGLE_NAMESPACE_
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// Sometimes, we can try to get a stack trace from within a stack
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// trace, because libunwind can call mmap (maybe indirectly via an
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// internal mmap based memory allocator), and that mmap gets trapped
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// and causes a stack-trace request. If were to try to honor that
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// recursive request, we'd end up with infinite recursion or deadlock.
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// Luckily, it's safe to ignore those subsequent traces. In such
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// cases, we return 0 to indicate the situation.
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static bool g_now_entering = false;
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// If you change this function, also change GetStackFrames below.
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int GetStackTrace(void** result, int max_depth, int skip_count) {
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void *ip;
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int n = 0;
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unw_cursor_t cursor;
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unw_context_t uc;
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if (sync_val_compare_and_swap(&g_now_entering, false, true)) {
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return 0;
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}
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unw_getcontext(&uc);
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RAW_CHECK(unw_init_local(&cursor, &uc) >= 0, "unw_init_local failed");
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skip_count++; // Do not include the "GetStackTrace" frame
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while (n < max_depth) {
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int ret = unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip);
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if (ret < 0)
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break;
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if (skip_count > 0) {
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skip_count--;
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} else {
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result[n++] = ip;
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}
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ret = unw_step(&cursor);
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if (ret <= 0)
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break;
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}
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g_now_entering = false;
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return n;
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}
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_END_GOOGLE_NAMESPACE_
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