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Diffstat (limited to 'thirdparty/glog/glog-0.3.5/src/stacktrace_libunwind-inl.h')
| -rw-r--r-- | thirdparty/glog/glog-0.3.5/src/stacktrace_libunwind-inl.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/thirdparty/glog/glog-0.3.5/src/stacktrace_libunwind-inl.h b/thirdparty/glog/glog-0.3.5/src/stacktrace_libunwind-inl.h new file mode 100644 index 0000000..ada9acd --- /dev/null +++ b/thirdparty/glog/glog-0.3.5/src/stacktrace_libunwind-inl.h @@ -0,0 +1,90 @@ +// Copyright (c) 2005 - 2007, Google Inc. +// All rights reserved. +// +// This file has been modified by Huawei. +// Copyright (C) 2018-2019, Huawei. +// +// 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_ |