| /* |
| * 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)); |
| 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) { |
| 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); |
| } |
| } |