e0ab23223a
The dlopen of a shared library in an apk results in large map offsets. Unfortunately, the current way that the frame data is printed, it's impossible to tell what the relative pc is relative to. With the addition of the offset, it's possible to figure out what the relative pc actually references. Bug: 23348999 Change-Id: Ia51b669ea3f810158cfd0d71d9ae89bf9a3170d3
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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