/*
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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 <utils/Printer.h>
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#include <utils/Errors.h>
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#include <utils/Log.h>
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#include <backtrace/Backtrace.h>
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#define CALLSTACK_WEAK // Don't generate weak definitions.
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#include <utils/CallStack.h>
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namespace android {
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CallStack::CallStack() {
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}
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CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
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this->update(ignoreDepth+1);
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this->log(logtag);
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}
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CallStack::~CallStack() {
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}
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void CallStack::update(int32_t ignoreDepth, pid_t tid) {
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mFrameLines.clear();
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std::unique_ptr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
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if (!backtrace->Unwind(ignoreDepth)) {
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ALOGW("%s: Failed to unwind callstack.", __FUNCTION__);
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}
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for (size_t i = 0; i < backtrace->NumFrames(); i++) {
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mFrameLines.push_back(String8(backtrace->FormatFrameData(i).c_str()));
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}
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}
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void CallStack::log(const char* logtag, android_LogPriority priority, const char* prefix) const {
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LogPrinter printer(logtag, priority, prefix, /*ignoreBlankLines*/false);
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print(printer);
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}
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void CallStack::dump(int fd, int indent, const char* prefix) const {
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FdPrinter printer(fd, indent, prefix);
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print(printer);
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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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String8Printer printer(&str, prefix);
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print(printer);
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return str;
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}
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void CallStack::print(Printer& printer) const {
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for (size_t i = 0; i < mFrameLines.size(); i++) {
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printer.printLine(mFrameLines[i]);
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}
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}
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// The following four functions may be used via weak symbol references from libutils.
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// Clients assume that if any of these symbols are available, then deleteStack() is.
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#ifdef WEAKS_AVAILABLE
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CallStack::CallStackUPtr CallStack::getCurrentInternal(int ignoreDepth) {
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CallStack::CallStackUPtr stack(new CallStack());
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stack->update(ignoreDepth + 1);
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return stack;
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}
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void CallStack::logStackInternal(const char* logtag, const CallStack* stack,
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android_LogPriority priority) {
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stack->log(logtag, priority);
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}
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String8 CallStack::stackToStringInternal(const char* prefix, const CallStack* stack) {
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return stack->toString(prefix);
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}
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void CallStack::deleteStack(CallStack* stack) {
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delete stack;
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}
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#endif // WEAKS_AVAILABLE
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}; // namespace android
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