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/*
* Copyright (C) 2018 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <inttypes.h>
#include <pthread.h>
#include <stdint.h>
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
#include <android-base/stringprintf.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Regs.h>
#include <unwindstack/RegsGetLocal.h>
#include <unwindstack/Unwinder.h>
#include "UnwindBacktrace.h"
#include "debug_log.h"
#if defined(__LP64__)
#define PAD_PTR "016" PRIx64
#else
#define PAD_PTR "08" PRIx64
#endif
extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
static pthread_once_t g_setup_once = PTHREAD_ONCE_INIT;
static unwindstack::LocalUpdatableMaps* g_maps;
static std::shared_ptr<unwindstack::Memory> g_process_memory;
#if defined(__LP64__)
static std::vector<std::string> g_skip_libraries{"/system/lib64/libunwindstack.so",
"/system/lib64/libc_malloc_debug.so"};
#else
static std::vector<std::string> g_skip_libraries{"/system/lib/libunwindstack.so",
"/system/lib/libc_malloc_debug.so"};
#endif
static void Setup() {
g_maps = new unwindstack::LocalUpdatableMaps;
if (!g_maps->Parse()) {
delete g_maps;
g_maps = nullptr;
}
g_process_memory = unwindstack::Memory::CreateProcessMemoryThreadCached(getpid());
}
bool Unwind(std::vector<uintptr_t>* frames, std::vector<unwindstack::FrameData>* frame_info,
size_t max_frames) {
pthread_once(&g_setup_once, Setup);
if (g_maps == nullptr) {
return false;
}
std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
unwindstack::RegsGetLocal(regs.get());
unwindstack::Unwinder unwinder(max_frames, g_maps, regs.get(), g_process_memory);
unwinder.Unwind(&g_skip_libraries);
if (unwinder.NumFrames() == 0) {
frames->clear();
frame_info->clear();
return false;
}
*frame_info = unwinder.ConsumeFrames();
frames->resize(frame_info->size());
for (size_t i = 0; i < frame_info->size(); i++) {
frames->at(i) = frame_info->at(i).pc;
}
return true;
}
void UnwindLog(const std::vector<unwindstack::FrameData>& frame_info) {
for (size_t i = 0; i < frame_info.size(); i++) {
const unwindstack::FrameData* info = &frame_info[i];
auto map_info = info->map_info;
std::string line = android::base::StringPrintf(" #%0zd pc %" PAD_PTR " ", i, info->rel_pc);
if (map_info != nullptr && map_info->offset() != 0) {
line += android::base::StringPrintf("(offset 0x%" PRIx64 ") ", map_info->offset());
}
if (map_info == nullptr) {
line += "<unknown>";
} else if (map_info->name().empty()) {
line += android::base::StringPrintf("<anonymous:%" PRIx64 ">", map_info->start());
} else {
line += map_info->name();
}
if (!info->function_name.empty()) {
line += " (";
char* demangled_name = __cxa_demangle(info->function_name.c_str(), nullptr, nullptr, nullptr);
if (demangled_name != nullptr) {
line += demangled_name;
free(demangled_name);
} else {
line += info->function_name;
}
if (info->function_offset != 0) {
line += "+" + std::to_string(info->function_offset);
}
line += ")";
}
error_log_string(line.c_str());
}
}
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