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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/activity_analyzer.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/memory_mapped_file.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
namespace base {
namespace debug {
ThreadActivityAnalyzer::Snapshot::Snapshot() {}
ThreadActivityAnalyzer::Snapshot::~Snapshot() {}
ThreadActivityAnalyzer::ThreadActivityAnalyzer(
const ThreadActivityTracker& tracker)
: activity_snapshot_valid_(tracker.CreateSnapshot(&activity_snapshot_)) {}
ThreadActivityAnalyzer::ThreadActivityAnalyzer(void* base, size_t size)
: ThreadActivityAnalyzer(ThreadActivityTracker(base, size)) {}
ThreadActivityAnalyzer::ThreadActivityAnalyzer(
PersistentMemoryAllocator* allocator,
PersistentMemoryAllocator::Reference reference)
: ThreadActivityAnalyzer(allocator->GetAsArray<char>(
reference,
GlobalActivityTracker::kTypeIdActivityTracker,
PersistentMemoryAllocator::kSizeAny),
allocator->GetAllocSize(reference)) {}
ThreadActivityAnalyzer::~ThreadActivityAnalyzer() {}
void ThreadActivityAnalyzer::AddGlobalInformation(
GlobalActivityAnalyzer* global) {
if (!IsValid())
return;
// User-data is held at the global scope even though it's referenced at the
// thread scope.
activity_snapshot_.user_data_stack.clear();
for (auto& activity : activity_snapshot_.activity_stack) {
// The global GetUserDataSnapshot will return an empty snapshot if the ref
// or id is not valid.
activity_snapshot_.user_data_stack.push_back(global->GetUserDataSnapshot(
activity.user_data_ref, activity.user_data_id));
}
}
GlobalActivityAnalyzer::GlobalActivityAnalyzer(
std::unique_ptr<PersistentMemoryAllocator> allocator)
: allocator_(std::move(allocator)), allocator_iterator_(allocator_.get()) {}
GlobalActivityAnalyzer::~GlobalActivityAnalyzer() {}
#if !defined(OS_NACL)
// static
std::unique_ptr<GlobalActivityAnalyzer> GlobalActivityAnalyzer::CreateWithFile(
const FilePath& file_path) {
// Map the file read-write so it can guarantee consistency between
// the analyzer and any trackers that my still be active.
std::unique_ptr<MemoryMappedFile> mmfile(new MemoryMappedFile());
mmfile->Initialize(file_path, MemoryMappedFile::READ_WRITE);
if (!mmfile->IsValid())
return nullptr;
if (!FilePersistentMemoryAllocator::IsFileAcceptable(*mmfile, true))
return nullptr;
return WrapUnique(
new GlobalActivityAnalyzer(MakeUnique<FilePersistentMemoryAllocator>(
std::move(mmfile), 0, 0, base::StringPiece(), true)));
}
#endif // !defined(OS_NACL)
ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetFirstAnalyzer() {
PrepareAllAnalyzers();
analyzers_iterator_ = analyzers_.begin();
if (analyzers_iterator_ == analyzers_.end())
return nullptr;
return analyzers_iterator_->second.get();
}
ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetNextAnalyzer() {
DCHECK(analyzers_iterator_ != analyzers_.end());
++analyzers_iterator_;
if (analyzers_iterator_ == analyzers_.end())
return nullptr;
return analyzers_iterator_->second.get();
}
ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetAnalyzerForThread(
const ThreadKey& key) {
auto found = analyzers_.find(key);
if (found == analyzers_.end())
return nullptr;
return found->second.get();
}
ActivityUserData::Snapshot GlobalActivityAnalyzer::GetUserDataSnapshot(
uint32_t ref,
uint32_t id) {
ActivityUserData::Snapshot snapshot;
void* memory = allocator_->GetAsArray<char>(
ref, GlobalActivityTracker::kTypeIdUserDataRecord,
PersistentMemoryAllocator::kSizeAny);
if (memory) {
size_t size = allocator_->GetAllocSize(ref);
const ActivityUserData user_data(memory, size);
user_data.CreateSnapshot(&snapshot);
if (user_data.id() != id) {
// This allocation has been overwritten since it was created. Return an
// empty snapshot because whatever was captured is incorrect.
snapshot.clear();
}
}
return snapshot;
}
ActivityUserData::Snapshot GlobalActivityAnalyzer::GetGlobalUserDataSnapshot() {
ActivityUserData::Snapshot snapshot;
PersistentMemoryAllocator::Reference ref =
PersistentMemoryAllocator::Iterator(allocator_.get())
.GetNextOfType(GlobalActivityTracker::kTypeIdGlobalDataRecord);
void* memory = allocator_->GetAsArray<char>(
ref, GlobalActivityTracker::kTypeIdGlobalDataRecord,
PersistentMemoryAllocator::kSizeAny);
if (memory) {
size_t size = allocator_->GetAllocSize(ref);
const ActivityUserData global_data(memory, size);
global_data.CreateSnapshot(&snapshot);
}
return snapshot;
}
std::vector<std::string> GlobalActivityAnalyzer::GetLogMessages() {
std::vector<std::string> messages;
PersistentMemoryAllocator::Reference ref;
PersistentMemoryAllocator::Iterator iter(allocator_.get());
while ((ref = iter.GetNextOfType(
GlobalActivityTracker::kTypeIdGlobalLogMessage)) != 0) {
const char* message = allocator_->GetAsArray<char>(
ref, GlobalActivityTracker::kTypeIdGlobalLogMessage,
PersistentMemoryAllocator::kSizeAny);
if (message)
messages.push_back(message);
}
return messages;
}
std::vector<GlobalActivityTracker::ModuleInfo>
GlobalActivityAnalyzer::GetModules() {
std::vector<GlobalActivityTracker::ModuleInfo> modules;
PersistentMemoryAllocator::Iterator iter(allocator_.get());
const GlobalActivityTracker::ModuleInfoRecord* record;
while (
(record =
iter.GetNextOfObject<GlobalActivityTracker::ModuleInfoRecord>()) !=
nullptr) {
GlobalActivityTracker::ModuleInfo info;
if (record->DecodeTo(&info, allocator_->GetAllocSize(
allocator_->GetAsReference(record)))) {
modules.push_back(std::move(info));
}
}
return modules;
}
GlobalActivityAnalyzer::ProgramLocation
GlobalActivityAnalyzer::GetProgramLocationFromAddress(uint64_t address) {
// TODO(bcwhite): Implement this.
return { 0, 0 };
}
void GlobalActivityAnalyzer::PrepareAllAnalyzers() {
// Fetch all the records. This will retrieve only ones created since the
// last run since the PMA iterator will continue from where it left off.
uint32_t type;
PersistentMemoryAllocator::Reference ref;
while ((ref = allocator_iterator_.GetNext(&type)) != 0) {
switch (type) {
case GlobalActivityTracker::kTypeIdActivityTracker:
case GlobalActivityTracker::kTypeIdActivityTrackerFree:
// Free or not, add it to the list of references for later analysis.
tracker_references_.insert(ref);
break;
}
}
// Go through all the known references and create analyzers for them with
// snapshots of the current state.
analyzers_.clear();
for (PersistentMemoryAllocator::Reference tracker_ref : tracker_references_) {
// Get the actual data segment for the tracker. This can fail if the
// record has been marked "free" since the type will not match.
void* base = allocator_->GetAsArray<char>(
tracker_ref, GlobalActivityTracker::kTypeIdActivityTracker,
PersistentMemoryAllocator::kSizeAny);
if (!base)
continue;
// Create the analyzer on the data. This will capture a snapshot of the
// tracker state. This can fail if the tracker is somehow corrupted or is
// in the process of shutting down.
std::unique_ptr<ThreadActivityAnalyzer> analyzer(new ThreadActivityAnalyzer(
base, allocator_->GetAllocSize(tracker_ref)));
if (!analyzer->IsValid())
continue;
analyzer->AddGlobalInformation(this);
// Add this analyzer to the map of known ones, indexed by a unique thread
// identifier.
DCHECK(!base::ContainsKey(analyzers_, analyzer->GetThreadKey()));
analyzer->allocator_reference_ = ref;
analyzers_[analyzer->GetThreadKey()] = std::move(analyzer);
}
}
} // namespace debug
} // namespace base
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