Android(安卓)C++层打印调用栈

在Android framework的C++层或其他C++服务中需要打印调用栈时，可以使用android中的CallStack类进行打印，该类的实现如下：
/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#define LOG_TAG "CallStack"#include #include #include #include #include namespace android {CallStack::CallStack() :        mCount(0) {}CallStack::CallStack(const char* logtag, int32_t ignoreDepth, int32_t maxDepth) {    this->update(ignoreDepth+1, maxDepth, CURRENT_THREAD);    this->log(logtag);}CallStack::CallStack(const CallStack& rhs) :        mCount(rhs.mCount) {    if (mCount) {        memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));    }}CallStack::~CallStack() {}CallStack& CallStack::operator = (const CallStack& rhs) {    mCount = rhs.mCount;    if (mCount) {        memcpy(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t));    }    return *this;}bool CallStack::operator == (const CallStack& rhs) const {    if (mCount != rhs.mCount)        return false;    return !mCount || memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) == 0;}bool CallStack::operator != (const CallStack& rhs) const {    return !operator == (rhs);}bool CallStack::operator < (const CallStack& rhs) const {    if (mCount != rhs.mCount)        return mCount < rhs.mCount;    return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) < 0;}bool CallStack::operator >= (const CallStack& rhs) const {    return !operator < (rhs);}bool CallStack::operator > (const CallStack& rhs) const {    if (mCount != rhs.mCount)        return mCount > rhs.mCount;    return memcmp(mStack, rhs.mStack, mCount * sizeof(backtrace_frame_t)) > 0;}bool CallStack::operator <= (const CallStack& rhs) const {    return !operator > (rhs);}const void* CallStack::operator [] (int index) const {    if (index >= int(mCount))        return 0;    return reinterpret_cast(mStack[index].absolute_pc);}void CallStack::clear() {    mCount = 0;}void CallStack::update(int32_t ignoreDepth, int32_t maxDepth, pid_t tid) {    if (maxDepth > MAX_DEPTH) {        maxDepth = MAX_DEPTH;    }    ssize_t count;    if (tid >= 0) {        count = unwind_backtrace_thread(tid, mStack, ignoreDepth + 1, maxDepth);    } else if (tid == CURRENT_THREAD) {        count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);    } else {        ALOGE("%s: Invalid tid specified (%d)", __FUNCTION__, tid);        count = 0;    }    mCount = count > 0 ? count : 0;}void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {    LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);    print(printer);}void CallStack::dump(int fd, int indent, const char* prefix) const {    FdPrinter printer(fd, indent, prefix);    print(printer);}String8 CallStack::toString(const char* prefix) const {    String8 str;    String8Printer printer(&str, prefix);    print(printer);    return str;}void CallStack::print(Printer& printer) const {    backtrace_symbol_t symbols[mCount];    get_backtrace_symbols(mStack, mCount, symbols);    for (size_t i = 0; i < mCount; i++) {        char line[MAX_BACKTRACE_LINE_LENGTH];        format_backtrace_line(i, &mStack[i], &symbols[i],                line, MAX_BACKTRACE_LINE_LENGTH);        printer.printLine(line);    }    free_backtrace_symbols(symbols, mCount);}}; // namespace android
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