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224 lines
7.2 KiB
224 lines
7.2 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <mutex>
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#include <android-base/stringprintf.h>
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#include "Config.h"
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#include "DebugData.h"
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#include "RecordData.h"
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#include "debug_disable.h"
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#include "debug_log.h"
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RecordEntry::RecordEntry() : tid_(gettid()) {
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}
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std::string ThreadCompleteEntry::GetString() const {
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return android::base::StringPrintf("%d: thread_done 0x0\n", tid_);
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}
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AllocEntry::AllocEntry(void* pointer) : pointer_(pointer) {}
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MallocEntry::MallocEntry(void* pointer, size_t size) : AllocEntry(pointer), size_(size) {}
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std::string MallocEntry::GetString() const {
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return android::base::StringPrintf("%d: malloc %p %zu\n", tid_, pointer_, size_);
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}
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FreeEntry::FreeEntry(void* pointer) : AllocEntry(pointer) {}
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std::string FreeEntry::GetString() const {
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return android::base::StringPrintf("%d: free %p\n", tid_, pointer_);
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}
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CallocEntry::CallocEntry(void* pointer, size_t nmemb, size_t size)
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: MallocEntry(pointer, size), nmemb_(nmemb) {}
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std::string CallocEntry::GetString() const {
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return android::base::StringPrintf("%d: calloc %p %zu %zu\n", tid_, pointer_, nmemb_, size_);
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}
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ReallocEntry::ReallocEntry(void* pointer, size_t size, void* old_pointer)
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: MallocEntry(pointer, size), old_pointer_(old_pointer) {}
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std::string ReallocEntry::GetString() const {
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return android::base::StringPrintf("%d: realloc %p %p %zu\n", tid_, pointer_, old_pointer_, size_);
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}
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// aligned_alloc, posix_memalign, memalign, pvalloc, valloc all recorded with this class.
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MemalignEntry::MemalignEntry(void* pointer, size_t size, size_t alignment)
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: MallocEntry(pointer, size), alignment_(alignment) {}
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std::string MemalignEntry::GetString() const {
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return android::base::StringPrintf("%d: memalign %p %zu %zu\n", tid_, pointer_, alignment_, size_);
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}
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struct ThreadData {
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ThreadData(RecordData* record_data, ThreadCompleteEntry* entry)
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: record_data(record_data), entry(entry) {}
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RecordData* record_data;
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ThreadCompleteEntry* entry;
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size_t count = 0;
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};
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static void ThreadKeyDelete(void* data) {
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ThreadData* thread_data = reinterpret_cast<ThreadData*>(data);
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thread_data->count++;
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// This should be the last time we are called.
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if (thread_data->count == 4) {
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ScopedDisableDebugCalls disable;
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thread_data->record_data->AddEntryOnly(thread_data->entry);
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delete thread_data;
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} else {
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pthread_setspecific(thread_data->record_data->key(), data);
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}
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}
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static void RecordDump(int, siginfo_t*, void*) {
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// It's not necessarily safe to do the dump here, instead wait for the
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// next allocation call to do the dump.
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g_debug->record->SetToDump();
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}
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void RecordData::Dump() {
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std::lock_guard<std::mutex> lock(dump_lock_);
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// Make it so that no more entries can be added while dumping.
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unsigned int last_entry_index = cur_index_.exchange(static_cast<unsigned int>(num_entries_));
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if (dump_ == false) {
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// Multiple Dump() calls from different threads, and we lost. Do nothing.
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return;
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}
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// cur_index_ keeps getting incremented even if we hit the num_entries_.
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// If that happens, cap the entries to dump by num_entries_.
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if (last_entry_index > num_entries_) {
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last_entry_index = num_entries_;
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}
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int dump_fd =
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open(dump_file_.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NOFOLLOW, 0755);
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if (dump_fd != -1) {
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for (size_t i = 0; i < last_entry_index; i++) {
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std::string line = entries_[i]->GetString();
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ssize_t bytes = write(dump_fd, line.c_str(), line.length());
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if (bytes == -1 || static_cast<size_t>(bytes) != line.length()) {
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error_log("Failed to write record alloc information: %s", strerror(errno));
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// Free all of the rest of the errors, we don't have any way
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// to dump a partial list of the entries.
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for (i++; i < last_entry_index; i++) {
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delete entries_[i];
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entries_[i] = nullptr;
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}
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break;
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}
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delete entries_[i];
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entries_[i] = nullptr;
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}
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close(dump_fd);
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// Mark the entries dumped.
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cur_index_ = 0U;
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} else {
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error_log("Cannot create record alloc file %s: %s", dump_file_.c_str(), strerror(errno));
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// Since we couldn't create the file, reset the entries dumped back
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// to the original value.
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cur_index_ = last_entry_index;
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}
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dump_ = false;
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}
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RecordData::RecordData() {
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pthread_key_create(&key_, ThreadKeyDelete);
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}
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bool RecordData::Initialize(const Config& config) {
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struct sigaction64 dump_act = {};
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dump_act.sa_sigaction = RecordDump;
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dump_act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
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if (sigaction64(config.record_allocs_signal(), &dump_act, nullptr) != 0) {
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error_log("Unable to set up record dump signal function: %s", strerror(errno));
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return false;
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}
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pthread_setspecific(key_, nullptr);
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if (config.options() & VERBOSE) {
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info_log("%s: Run: 'kill -%d %d' to dump the allocation records.", getprogname(),
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config.record_allocs_signal(), getpid());
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}
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num_entries_ = config.record_allocs_num_entries();
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entries_ = new const RecordEntry*[num_entries_];
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cur_index_ = 0;
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dump_ = false;
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dump_file_ = config.record_allocs_file();
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return true;
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}
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RecordData::~RecordData() {
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delete[] entries_;
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pthread_key_delete(key_);
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}
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void RecordData::AddEntryOnly(const RecordEntry* entry) {
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unsigned int entry_index = cur_index_.fetch_add(1);
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if (entry_index < num_entries_) {
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entries_[entry_index] = entry;
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}
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}
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void RecordData::AddEntry(const RecordEntry* entry) {
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void* data = pthread_getspecific(key_);
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if (data == nullptr) {
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ThreadData* thread_data = new ThreadData(this, new ThreadCompleteEntry());
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pthread_setspecific(key_, thread_data);
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}
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AddEntryOnly(entry);
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// Check to see if it's time to dump the entries.
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if (dump_) {
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Dump();
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}
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}
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