312 lines
10 KiB
C++
312 lines
10 KiB
C++
// Copyright (c) 2013 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/browser/javascript_environment.h"
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#include <memory>
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#include <string>
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#include <unordered_set>
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#include <utility>
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#include "base/allocator/partition_alloc_features.h"
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#include "base/allocator/partition_allocator/partition_alloc.h"
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#include "base/bits.h"
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#include "base/command_line.h"
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#include "base/feature_list.h"
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#include "base/task/current_thread.h"
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#include "base/task/thread_pool/initialization_util.h"
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#include "base/threading/thread_task_runner_handle.h"
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#include "base/trace_event/trace_event.h"
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#include "gin/array_buffer.h"
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#include "gin/v8_initializer.h"
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#include "shell/browser/microtasks_runner.h"
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#include "shell/common/gin_helper/cleaned_up_at_exit.h"
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#include "shell/common/node_includes.h"
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#include "third_party/blink/public/common/switches.h"
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namespace {
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v8::Isolate* g_isolate;
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}
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namespace gin {
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class ConvertableToTraceFormatWrapper final
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: public base::trace_event::ConvertableToTraceFormat {
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public:
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explicit ConvertableToTraceFormatWrapper(
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std::unique_ptr<v8::ConvertableToTraceFormat> inner)
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: inner_(std::move(inner)) {}
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~ConvertableToTraceFormatWrapper() override = default;
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// disable copy
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ConvertableToTraceFormatWrapper(const ConvertableToTraceFormatWrapper&) =
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delete;
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ConvertableToTraceFormatWrapper& operator=(
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const ConvertableToTraceFormatWrapper&) = delete;
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void AppendAsTraceFormat(std::string* out) const final {
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inner_->AppendAsTraceFormat(out);
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}
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private:
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std::unique_ptr<v8::ConvertableToTraceFormat> inner_;
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};
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} // namespace gin
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// Allow std::unique_ptr<v8::ConvertableToTraceFormat> to be a valid
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// initialization value for trace macros.
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template <>
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struct base::trace_event::TraceValue::Helper<
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std::unique_ptr<v8::ConvertableToTraceFormat>> {
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static constexpr unsigned char kType = TRACE_VALUE_TYPE_CONVERTABLE;
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static inline void SetValue(
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TraceValue* v,
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std::unique_ptr<v8::ConvertableToTraceFormat> value) {
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// NOTE: |as_convertable| is an owning pointer, so using new here
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// is acceptable.
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v->as_convertable =
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new gin::ConvertableToTraceFormatWrapper(std::move(value));
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}
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};
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namespace electron {
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JavascriptEnvironment::JavascriptEnvironment(uv_loop_t* event_loop)
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: isolate_(Initialize(event_loop)),
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isolate_holder_(base::ThreadTaskRunnerHandle::Get(),
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gin::IsolateHolder::kSingleThread,
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gin::IsolateHolder::kAllowAtomicsWait,
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gin::IsolateHolder::IsolateType::kUtility,
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gin::IsolateHolder::IsolateCreationMode::kNormal,
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nullptr,
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nullptr,
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isolate_),
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locker_(isolate_) {
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isolate_->Enter();
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v8::HandleScope scope(isolate_);
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auto context = node::NewContext(isolate_);
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context_ = v8::Global<v8::Context>(isolate_, context);
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context->Enter();
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}
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JavascriptEnvironment::~JavascriptEnvironment() {
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DCHECK_NE(platform_, nullptr);
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platform_->DrainTasks(isolate_);
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{
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v8::HandleScope scope(isolate_);
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context_.Get(isolate_)->Exit();
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}
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isolate_->Exit();
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g_isolate = nullptr;
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platform_->UnregisterIsolate(isolate_);
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}
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class EnabledStateObserverImpl final
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: public base::trace_event::TraceLog::EnabledStateObserver {
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public:
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EnabledStateObserverImpl() {
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base::trace_event::TraceLog::GetInstance()->AddEnabledStateObserver(this);
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}
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~EnabledStateObserverImpl() override {
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base::trace_event::TraceLog::GetInstance()->RemoveEnabledStateObserver(
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this);
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}
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// disable copy
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EnabledStateObserverImpl(const EnabledStateObserverImpl&) = delete;
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EnabledStateObserverImpl& operator=(const EnabledStateObserverImpl&) = delete;
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void OnTraceLogEnabled() final {
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base::AutoLock lock(mutex_);
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for (auto* o : observers_) {
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o->OnTraceEnabled();
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}
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}
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void OnTraceLogDisabled() final {
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base::AutoLock lock(mutex_);
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for (auto* o : observers_) {
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o->OnTraceDisabled();
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}
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}
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void AddObserver(v8::TracingController::TraceStateObserver* observer) {
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{
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base::AutoLock lock(mutex_);
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DCHECK(!observers_.count(observer));
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observers_.insert(observer);
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}
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// Fire the observer if recording is already in progress.
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if (base::trace_event::TraceLog::GetInstance()->IsEnabled())
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observer->OnTraceEnabled();
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}
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void RemoveObserver(v8::TracingController::TraceStateObserver* observer) {
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base::AutoLock lock(mutex_);
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DCHECK_EQ(observers_.count(observer), 1lu);
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observers_.erase(observer);
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}
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private:
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base::Lock mutex_;
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std::unordered_set<v8::TracingController::TraceStateObserver*> observers_;
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};
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base::LazyInstance<EnabledStateObserverImpl>::Leaky g_trace_state_dispatcher =
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LAZY_INSTANCE_INITIALIZER;
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class TracingControllerImpl : public node::tracing::TracingController {
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public:
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TracingControllerImpl() = default;
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~TracingControllerImpl() override = default;
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// disable copy
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TracingControllerImpl(const TracingControllerImpl&) = delete;
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TracingControllerImpl& operator=(const TracingControllerImpl&) = delete;
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// TracingController implementation.
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const uint8_t* GetCategoryGroupEnabled(const char* name) override {
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return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(name);
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}
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uint64_t AddTraceEvent(
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char phase,
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const uint8_t* category_enabled_flag,
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const char* name,
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const char* scope,
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uint64_t id,
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uint64_t bind_id,
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int32_t num_args,
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const char** arg_names,
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const uint8_t* arg_types,
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const uint64_t* arg_values,
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std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
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unsigned int flags) override {
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base::trace_event::TraceArguments args(
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num_args, arg_names, arg_types,
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reinterpret_cast<const unsigned long long*>( // NOLINT(runtime/int)
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arg_values),
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arg_convertables);
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DCHECK_LE(num_args, 2);
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base::trace_event::TraceEventHandle handle =
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TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_BIND_ID(
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phase, category_enabled_flag, name, scope, id, bind_id, &args,
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flags);
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uint64_t result;
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memcpy(&result, &handle, sizeof(result));
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return result;
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}
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uint64_t AddTraceEventWithTimestamp(
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char phase,
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const uint8_t* category_enabled_flag,
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const char* name,
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const char* scope,
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uint64_t id,
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uint64_t bind_id,
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int32_t num_args,
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const char** arg_names,
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const uint8_t* arg_types,
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const uint64_t* arg_values,
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std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
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unsigned int flags,
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int64_t timestampMicroseconds) override {
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base::trace_event::TraceArguments args(
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num_args, arg_names, arg_types,
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reinterpret_cast<const unsigned long long*>( // NOLINT(runtime/int)
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arg_values),
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arg_convertables);
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DCHECK_LE(num_args, 2);
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base::TimeTicks timestamp =
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base::TimeTicks() + base::Microseconds(timestampMicroseconds);
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base::trace_event::TraceEventHandle handle =
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TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
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phase, category_enabled_flag, name, scope, id, bind_id,
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TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, &args, flags);
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uint64_t result;
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memcpy(&result, &handle, sizeof(result));
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return result;
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}
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void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
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const char* name,
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uint64_t handle) override {
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base::trace_event::TraceEventHandle traceEventHandle;
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memcpy(&traceEventHandle, &handle, sizeof(handle));
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TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_enabled_flag, name,
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traceEventHandle);
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}
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void AddTraceStateObserver(TraceStateObserver* observer) override {
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g_trace_state_dispatcher.Get().AddObserver(observer);
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}
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void RemoveTraceStateObserver(TraceStateObserver* observer) override {
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g_trace_state_dispatcher.Get().RemoveObserver(observer);
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}
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};
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v8::Isolate* JavascriptEnvironment::Initialize(uv_loop_t* event_loop) {
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auto* cmd = base::CommandLine::ForCurrentProcess();
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// --js-flags.
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std::string js_flags =
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cmd->GetSwitchValueASCII(blink::switches::kJavaScriptFlags);
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if (!js_flags.empty())
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v8::V8::SetFlagsFromString(js_flags.c_str(), js_flags.size());
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// The V8Platform of gin relies on Chromium's task schedule, which has not
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// been started at this point, so we have to rely on Node's V8Platform.
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auto* tracing_agent = node::CreateAgent();
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auto* tracing_controller = new TracingControllerImpl();
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node::tracing::TraceEventHelper::SetAgent(tracing_agent);
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platform_ = node::CreatePlatform(
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base::RecommendedMaxNumberOfThreadsInThreadGroup(3, 8, 0.1, 0),
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tracing_controller, gin::V8Platform::PageAllocator());
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v8::V8::InitializePlatform(platform_);
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gin::IsolateHolder::Initialize(gin::IsolateHolder::kNonStrictMode,
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gin::ArrayBufferAllocator::SharedInstance(),
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nullptr /* external_reference_table */,
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js_flags, nullptr /* fatal_error_callback */,
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nullptr /* oom_error_callback */,
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false /* create_v8_platform */);
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v8::Isolate* isolate = v8::Isolate::Allocate();
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platform_->RegisterIsolate(isolate, event_loop);
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g_isolate = isolate;
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return isolate;
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}
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// static
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v8::Isolate* JavascriptEnvironment::GetIsolate() {
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CHECK(g_isolate);
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return g_isolate;
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}
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void JavascriptEnvironment::OnMessageLoopCreated() {
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DCHECK(!microtasks_runner_);
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microtasks_runner_ = std::make_unique<MicrotasksRunner>(isolate());
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base::CurrentThread::Get()->AddTaskObserver(microtasks_runner_.get());
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}
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void JavascriptEnvironment::OnMessageLoopDestroying() {
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DCHECK(microtasks_runner_);
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{
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v8::HandleScope scope(isolate_);
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gin_helper::CleanedUpAtExit::DoCleanup();
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}
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base::CurrentThread::Get()->RemoveTaskObserver(microtasks_runner_.get());
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}
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NodeEnvironment::NodeEnvironment(node::Environment* env) : env_(env) {}
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NodeEnvironment::~NodeEnvironment() {
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auto* isolate_data = env_->isolate_data();
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node::FreeEnvironment(env_);
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node::FreeIsolateData(isolate_data);
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}
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} // namespace electron
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