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/*
* Copyright (C) 2013 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.
*/
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <ucontext.h>
#include <string>
#include <base/stringprintf.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <cutils/threads.h>
#include "BacktraceLog.h"
#include "thread_utils.h"
#include "UnwindCurrent.h"
#include "UnwindPtrace.h"
using android::base::StringPrintf;
//-------------------------------------------------------------------------
// Backtrace functions.
//-------------------------------------------------------------------------
Backtrace::Backtrace(pid_t pid, pid_t tid, BacktraceMap* map)
: pid_(pid), tid_(tid), map_(map), map_shared_(true) {
if (map_ == nullptr) {
map_ = BacktraceMap::Create(pid);
map_shared_ = false;
}
}
Backtrace::~Backtrace() {
if (map_ && !map_shared_) {
delete map_;
map_ = nullptr;
}
}
extern "C" char* __cxa_demangle(const char* mangled, char* buf, size_t* len,
int* status);
std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
std::string func_name = GetFunctionNameRaw(pc, offset);
if (!func_name.empty()) {
#if defined(__APPLE__)
// Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.
if (func_name[0] != '_') {
return func_name;
}
#endif
char* name = __cxa_demangle(func_name.c_str(), 0, 0, 0);
if (name) {
func_name = name;
free(name);
}
}
return func_name;
}
bool Backtrace::VerifyReadWordArgs(uintptr_t ptr, word_t* out_value) {
if (ptr & (sizeof(word_t)-1)) {
BACK_LOGW("invalid pointer %p", reinterpret_cast<void*>(ptr));
*out_value = static_cast<word_t>(-1);
return false;
}
return true;
}
std::string Backtrace::FormatFrameData(size_t frame_num) {
if (frame_num >= frames_.size()) {
return "";
}
return FormatFrameData(&frames_[frame_num]);
}
std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
const char* map_name;
if (BacktraceMap::IsValid(frame->map) && !frame->map.name.empty()) {
map_name = frame->map.name.c_str();
} else {
map_name = "<unknown>";
}
uintptr_t relative_pc = BacktraceMap::GetRelativePc(frame->map, frame->pc);
std::string line(StringPrintf("#%02zu pc %" PRIPTR " %s", frame->num, relative_pc, map_name));
// Special handling for non-zero offset maps, we need to print that
// information.
if (frame->map.offset != 0) {
line += " (offset " + StringPrintf("0x%" PRIxPTR, frame->map.offset) + ")";
}
if (!frame->func_name.empty()) {
line += " (" + frame->func_name;
if (frame->func_offset) {
line += StringPrintf("+%" PRIuPTR, frame->func_offset);
}
line += ')';
}
return line;
}
void Backtrace::FillInMap(uintptr_t pc, backtrace_map_t* map) {
if (map_ != nullptr) {
map_->FillIn(pc, map);
}
}
Backtrace* Backtrace::Create(pid_t pid, pid_t tid, BacktraceMap* map) {
if (pid == BACKTRACE_CURRENT_PROCESS) {
pid = getpid();
if (tid == BACKTRACE_CURRENT_THREAD) {
tid = gettid();
}
} else if (tid == BACKTRACE_CURRENT_THREAD) {
tid = pid;
}
if (pid == getpid()) {
return new UnwindCurrent(pid, tid, map);
} else {
return new UnwindPtrace(pid, tid, map);
}
}
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