mirror of
https://github.com/ClickHouse/ClickHouse.git
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153 lines
5.0 KiB
C++
153 lines
5.0 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2005, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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#ifndef BASE_STACKTRACE_LIBINWIND_INL_H_
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#define BASE_STACKTRACE_LIBINWIND_INL_H_
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// Note: this file is included into stacktrace.cc more than once.
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// Anything that should only be defined once should be here:
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// We only need local unwinder.
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#define UNW_LOCAL_ONLY
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extern "C" {
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#include <assert.h>
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#include <string.h> // for memset()
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#include <libunwind.h>
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}
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#include "gperftools/stacktrace.h"
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#include "base/basictypes.h"
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#include "base/logging.h"
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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 __thread int recursive ATTR_INITIAL_EXEC;
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#if defined(TCMALLOC_ENABLE_UNWIND_FROM_UCONTEXT) && (defined(__i386__) || defined(__x86_64__)) && defined(__GNU_LIBRARY__)
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#define BASE_STACKTRACE_UNW_CONTEXT_IS_UCONTEXT 1
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#endif
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#endif // BASE_STACKTRACE_LIBINWIND_INL_H_
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// Note: this part of the file is included several times.
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// Do not put globals below.
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// The following 4 functions are generated from the code below:
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// GetStack{Trace,Frames}()
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// GetStack{Trace,Frames}WithContext()
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//
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// These functions take the following args:
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// void** result: the stack-trace, as an array
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// int* sizes: the size of each stack frame, as an array
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// (GetStackFrames* only)
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// int max_depth: the size of the result (and sizes) array(s)
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// int skip_count: how many stack pointers to skip before storing in result
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// void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
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static int GET_STACK_TRACE_OR_FRAMES {
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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 IS_STACK_FRAMES
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unw_word_t sp = 0, next_sp = 0;
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#endif
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if (recursive) {
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return 0;
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}
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++recursive;
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#if (IS_WITH_CONTEXT && defined(BASE_STACKTRACE_UNW_CONTEXT_IS_UCONTEXT))
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if (ucp) {
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uc = *(static_cast<unw_context_t *>(const_cast<void *>(ucp)));
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/* this is a bit weird. profiler.cc calls us with signal's ucontext
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* yet passing us 2 as skip_count and essentially assuming we won't
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* use ucontext. */
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/* In order to fix that I'm going to assume that if ucp is
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* non-null we're asked to ignore skip_count in case we're
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* able to use ucp */
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skip_count = 0;
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} else {
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unw_getcontext(&uc);
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skip_count += 2; // Do not include current and parent frame
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}
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#else
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unw_getcontext(&uc);
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skip_count += 2; // Do not include current and parent frame
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#endif
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/*int ret =*/ unw_init_local(&cursor, &uc);
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//assert(ret >= 0);
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while (skip_count--) {
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if (unw_step(&cursor) <= 0) {
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goto out;
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}
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#if IS_STACK_FRAMES
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if (unw_get_reg(&cursor, UNW_REG_SP, &next_sp)) {
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goto out;
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}
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#endif
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}
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while (n < max_depth) {
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if (unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip) < 0) {
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break;
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}
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#if IS_STACK_FRAMES
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sizes[n] = 0;
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#endif
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result[n++] = ip;
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if (unw_step(&cursor) <= 0) {
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break;
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}
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#if IS_STACK_FRAMES
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sp = next_sp;
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if (unw_get_reg(&cursor, UNW_REG_SP, &next_sp) , 0) {
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break;
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}
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sizes[n - 1] = next_sp - sp;
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#endif
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}
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out:
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--recursive;
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return n;
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}
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