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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 <string.h>
#include <utils/Log.h>
#include <utils/Errors.h>
#include <utils/CallStack.h>
#include <corkscrew/backtrace.h>
/*****************************************************************************/
namespace android {
CallStack::CallStack() :
mCount(0) {
}
CallStack::CallStack(const char* logtag, int32_t ignoreDepth, int32_t maxDepth) {
this->update(ignoreDepth+1, maxDepth);
this->dump(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<const void*>(mStack[index].absolute_pc);
}
void CallStack::clear() {
mCount = 0;
}
void CallStack::update(int32_t ignoreDepth, int32_t maxDepth) {
if (maxDepth > MAX_DEPTH) {
maxDepth = MAX_DEPTH;
}
ssize_t count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
mCount = count > 0 ? count : 0;
}
void CallStack::dump(const char* logtag, const char* prefix) 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);
ALOG(LOG_DEBUG, logtag, "%s%s",
prefix ? prefix : "",
line);
}
free_backtrace_symbols(symbols, mCount);
}
String8 CallStack::toString(const char* prefix) const {
String8 str;
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);
if (prefix) {
str.append(prefix);
}
str.append(line);
str.append("\n");
}
free_backtrace_symbols(symbols, mCount);
return str;
}
}; // namespace android
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