Android C++层打印调用栈
16lz
2021-01-23
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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