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/*
* 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 <utils/Printer.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <unwindstack/AndroidUnwinder.h>
#define CALLSTACK_WEAK // Don't generate weak definitions.
#include <utils/CallStack.h>
namespace android {
CallStack::CallStack() {
}
CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
this->update(ignoreDepth+1);
this->log(logtag);
}
CallStack::~CallStack() {
}
void CallStack::update(int32_t ignoreDepth, pid_t tid) {
if (ignoreDepth < 0) {
ignoreDepth = 0;
}
mFrameLines.clear();
unwindstack::AndroidLocalUnwinder unwinder;
unwindstack::AndroidUnwinderData data;
std::optional<pid_t> tid_val;
if (tid != -1) {
tid_val = tid;
}
if (!unwinder.Unwind(tid_val, data)) {
ALOGW("%s: Failed to unwind callstack: %s", __FUNCTION__, data.GetErrorString().c_str());
}
for (size_t i = ignoreDepth; i < data.frames.size(); i++) {
auto& frame = data.frames[i];
frame.num -= ignoreDepth;
mFrameLines.push_back(String8(unwinder.FormatFrame(frame).c_str()));
}
}
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 {
for (size_t i = 0; i < mFrameLines.size(); i++) {
printer.printLine(mFrameLines[i].c_str());
}
}
// The following four functions may be used via weak symbol references from libutils.
// Clients assume that if any of these symbols are available, then deleteStack() is.
#ifdef WEAKS_AVAILABLE
CallStack::CallStackUPtr CallStack::getCurrentInternal(int ignoreDepth) {
CallStack::CallStackUPtr stack(new CallStack());
stack->update(ignoreDepth + 1);
return stack;
}
void CallStack::logStackInternal(const char* logtag, const CallStack* stack,
android_LogPriority priority) {
stack->log(logtag, priority);
}
String8 CallStack::stackToStringInternal(const char* prefix, const CallStack* stack) {
return stack->toString(prefix);
}
void CallStack::deleteStack(CallStack* stack) {
delete stack;
}
#endif // WEAKS_AVAILABLE
}; // namespace android
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