cab25d680e
- added a ctor that updates and dumps the stack immediately - added a "logtag" parameter to dump() Change-Id: Ie51c256071d282591752243bdb4f68cf9ff8829d
139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "CallStack"
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#include <string.h>
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#include <utils/Log.h>
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#include <utils/Errors.h>
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#include <utils/CallStack.h>
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#include <corkscrew/backtrace.h>
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/*****************************************************************************/
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namespace android {
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CallStack::CallStack() :
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mCount(0) {
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}
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CallStack::CallStack(const char* logtag, int32_t ignoreDepth, int32_t maxDepth) {
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this->update(ignoreDepth+1, maxDepth);
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this->dump(logtag);
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}
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CallStack::CallStack(const CallStack& rhs) :
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mCount(rhs.mCount) {
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if (mCount) {
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memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
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}
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}
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CallStack::~CallStack() {
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}
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CallStack& CallStack::operator = (const CallStack& rhs) {
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mCount = rhs.mCount;
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if (mCount) {
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memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));
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}
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return *this;
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}
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bool CallStack::operator == (const CallStack& rhs) const {
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if (mCount != rhs.mCount)
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return false;
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return !mCount || memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) == 0;
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}
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bool CallStack::operator != (const CallStack& rhs) const {
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return !operator == (rhs);
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}
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bool CallStack::operator < (const CallStack& rhs) const {
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if (mCount != rhs.mCount)
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return mCount < rhs.mCount;
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return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) < 0;
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}
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bool CallStack::operator >= (const CallStack& rhs) const {
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return !operator < (rhs);
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}
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bool CallStack::operator > (const CallStack& rhs) const {
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if (mCount != rhs.mCount)
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return mCount > rhs.mCount;
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return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) > 0;
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}
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bool CallStack::operator <= (const CallStack& rhs) const {
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return !operator > (rhs);
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}
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const void* CallStack::operator [] (int index) const {
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if (index >= int(mCount))
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return 0;
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return reinterpret_cast<const void*>(mStack[index].absolute_pc);
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}
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void CallStack::clear() {
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mCount = 0;
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}
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void CallStack::update(int32_t ignoreDepth, int32_t maxDepth) {
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if (maxDepth > MAX_DEPTH) {
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maxDepth = MAX_DEPTH;
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}
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ssize_t count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
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mCount = count > 0 ? count : 0;
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}
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void CallStack::dump(const char* logtag, const char* prefix) const {
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backtrace_symbol_t symbols[mCount];
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get_backtrace_symbols(mStack, mCount, symbols);
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for (size_t i = 0; i < mCount; i++) {
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char line[MAX_BACKTRACE_LINE_LENGTH];
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format_backtrace_line(i, &mStack[i], &symbols[i],
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line, MAX_BACKTRACE_LINE_LENGTH);
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ALOG(LOG_DEBUG, logtag, "%s%s",
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prefix ? prefix : "",
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line);
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}
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free_backtrace_symbols(symbols, mCount);
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}
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String8 CallStack::toString(const char* prefix) const {
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String8 str;
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backtrace_symbol_t symbols[mCount];
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get_backtrace_symbols(mStack, mCount, symbols);
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for (size_t i = 0; i < mCount; i++) {
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char line[MAX_BACKTRACE_LINE_LENGTH];
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format_backtrace_line(i, &mStack[i], &symbols[i],
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line, MAX_BACKTRACE_LINE_LENGTH);
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if (prefix) {
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str.append(prefix);
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}
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str.append(line);
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str.append("\n");
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}
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free_backtrace_symbols(symbols, mCount);
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return str;
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}
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}; // namespace android
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