зеркало из https://github.com/electron/electron.git
146 строки
5.0 KiB
C++
146 строки
5.0 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/src/partition_alloc/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/single_thread_task_runner.h"
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#include "base/task/thread_pool/initialization_util.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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#include "third_party/electron_node/src/node_wasm_web_api.h"
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namespace {
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v8::Isolate* g_isolate;
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}
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namespace electron {
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namespace {
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gin::IsolateHolder CreateIsolateHolder(v8::Isolate* isolate) {
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std::unique_ptr<v8::Isolate::CreateParams> create_params =
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gin::IsolateHolder::getDefaultIsolateParams();
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// Align behavior with V8 Isolate default for Node.js.
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// This is necessary for important aspects of Node.js
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// including heap and cpu profilers to function properly.
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return gin::IsolateHolder(base::SingleThreadTaskRunner::GetCurrentDefault(),
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gin::IsolateHolder::kSingleThread,
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gin::IsolateHolder::IsolateType::kUtility,
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std::move(create_params),
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gin::IsolateHolder::IsolateCreationMode::kNormal,
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nullptr, nullptr, isolate);
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}
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} // namespace
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JavascriptEnvironment::JavascriptEnvironment(uv_loop_t* event_loop,
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bool setup_wasm_streaming)
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: isolate_holder_{CreateIsolateHolder(
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Initialize(event_loop, setup_wasm_streaming))},
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isolate_{isolate_holder_.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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CHECK(!context.IsEmpty());
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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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{
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v8::HandleScope scope(isolate_);
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isolate_->GetCurrentContext()->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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v8::Isolate* JavascriptEnvironment::Initialize(uv_loop_t* event_loop,
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bool setup_wasm_streaming) {
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auto* cmd = base::CommandLine::ForCurrentProcess();
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// --js-flags.
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std::string js_flags = "--no-freeze-flags-after-init ";
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js_flags.append(cmd->GetSwitchValueASCII(blink::switches::kJavaScriptFlags));
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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 = tracing_agent->GetTracingController();
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node::tracing::TraceEventHelper::SetAgent(tracing_agent);
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platform_ = node::MultiIsolatePlatform::Create(
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base::RecommendedMaxNumberOfThreadsInThreadGroup(3, 8, 0.1, 0),
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tracing_controller, gin::V8Platform::GetCurrentPageAllocator());
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v8::V8::InitializePlatform(platform_.get());
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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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// This is done here because V8 checks for the callback in NewContext.
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// Our setup order doesn't allow for calling SetupIsolateForNode
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// before NewContext without polluting JavaScriptEnvironment with
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// Node.js logic and so we conditionally do it here to keep
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// concerns separate.
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if (setup_wasm_streaming) {
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isolate->SetWasmStreamingCallback(
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node::wasm_web_api::StartStreamingCompilation);
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}
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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::CreateMicrotasksRunner() {
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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::DestroyMicrotasksRunner() {
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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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} // namespace electron
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