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