[inspector] added inspector test runner [part 1]

test/inspector-protocol/task-runner.cc

+// Copyright 2016 the V8 project 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 "test/inspector-protocol/task-runner.h"
+
+namespace {
+
+const int kTaskRunnerIndex = 2;
+
+class TaskScope {
+ public:
+  TaskScope(v8::Isolate* isolate, const v8::Global<v8::Context>& context);
+  ~TaskScope();
+
+  v8::Local<v8::Context> context() { return context_; }
+
+ private:
+  v8::Isolate* isolate_;
+  v8::Isolate::Scope isolate_scope_;
+  v8::HandleScope handle_scope_;
+  v8::Local<v8::Context> context_;
+  v8::Context::Scope context_scope_;
+  v8::MicrotasksScope microtasks_scope_;
+  v8::TryCatch try_catch_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskScope);
+};
+
+TaskScope::TaskScope(v8::Isolate* isolate,
+                     const v8::Global<v8::Context>& context)
+    : isolate_(isolate),
+      isolate_scope_(isolate),
+      handle_scope_(isolate),
+      context_(context.Get(isolate)),
+      context_scope_(context_),
+      microtasks_scope_(isolate_, v8::MicrotasksScope::kRunMicrotasks),
+      try_catch_(isolate_) {}
+
+TaskScope::~TaskScope() {
+  if (try_catch_.HasCaught()) {
+    std::string message = *v8::String::Utf8Value(try_catch_.Message()->Get());
+    fprintf(stderr, "Unhandle exception: %s\n", message.data());
+    fflush(stdout);
+    fflush(stderr);
+    _exit(0);
+  }
+}
+
+}  //  namespace
+
+TaskRunner::TaskRunner(v8::ExtensionConfiguration* extensions,
+                       v8::base::Semaphore* ready)
+    : Thread(Options("Task Runner")),
+      extensions_(extensions),
+      ready_(ready),
+      isolate_(nullptr),
+      process_queue_semaphore_(0),
+      nested_loops_(0) {
+  Start();
+}
+
+TaskRunner::~TaskRunner() { Join(); }
+
+void TaskRunner::InitializeContext() {
+  v8::Isolate::CreateParams params;
+  params.array_buffer_allocator =
+      v8::ArrayBuffer::Allocator::NewDefaultAllocator();
+  isolate_ = v8::Isolate::New(params);
+  isolate_->SetMicrotasksPolicy(v8::MicrotasksPolicy::kScoped);
+  v8::Isolate::Scope isolate_scope(isolate_);
+  v8::HandleScope handle_scope(isolate_);
+
+  v8::Local<v8::ObjectTemplate> global_template =
+      v8::ObjectTemplate::New(isolate_);
+  v8::Local<v8::Context> context =
+      v8::Context::New(isolate_, extensions_, global_template);
+  context->SetAlignedPointerInEmbedderData(kTaskRunnerIndex, this);
+  context_.Reset(isolate_, context);
+
+  if (ready_) ready_->Signal();
+}
+
+void TaskRunner::Run() {
+  InitializeContext();
+  RunMessageLoop(false);
+}
+
+void TaskRunner::RunMessageLoop(bool only_protocol) {
+  int loop_number = ++nested_loops_;
+  while (nested_loops_ == loop_number) {
+    TaskRunner::Task* task = GetNext(only_protocol);
+    TaskScope task_scope(isolate_, context_);
+    task->Run(task_scope.context());
+    delete task;
+  }
+}
+
+void TaskRunner::QuitMessageLoop() {
+  DCHECK(nested_loops_ > 0);
+  --nested_loops_;
+}
+
+void TaskRunner::Append(Task* task) {
+  queue_.Enqueue(task);
+  process_queue_semaphore_.Signal();
+}
+
+TaskRunner::Task* TaskRunner::GetNext(bool only_protocol) {
+  for (;;) {
+    if (only_protocol) {
+      for (;;) {

[dgozman, 2016/09/24 00:56:10]

Let's remove this for()

[kozy, 2016/09/26 01:44:08]

Done.

+        Task* task = nullptr;
+        if (!queue_.Dequeue(&task)) break;
+        if (task->is_protocol_task()) return task;
+        deffered_queue_.Enqueue(task);
+      }
+    } else {
+      Task* task = nullptr;
+      if (deffered_queue_.Dequeue(&task)) return task;
+      if (queue_.Dequeue(&task)) return task;
+    }
+    process_queue_semaphore_.Wait();
+  }
+}
+
+TaskRunner* TaskRunner::FromContext(v8::Local<v8::Context> context) {
+  return static_cast<TaskRunner*>(
+      context->GetAlignedPointerFromEmbedderData(kTaskRunnerIndex));
+}
+
+ExecuteStringTask::ExecuteStringTask(const std::string& expression)
+    : expression_(expression) {}
+
+void ExecuteStringTask::Run(v8::Local<v8::Context> context) {
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::ScriptOrigin origin(v8::String::Empty(isolate));
+
+  v8::Local<v8::String> source =

[dgozman, 2016/09/24 00:56:09]

HandleScope

[kozy, 2016/09/26 01:44:08]

Done.

+      v8::String::NewFromUtf8(isolate, expression_.data(),
+                              v8::NewStringType::kNormal)
+          .ToLocalChecked();
+
+  v8::ScriptCompiler::Source scriptSource(source, origin);
+  v8::Local<v8::Script> script;
+  if (!v8::ScriptCompiler::Compile(context, &scriptSource).ToLocal(&script))

[dgozman, 2016/09/24 00:56:09]

ContextScope

[kozy, 2016/09/26 01:44:08]

Done.

+    return;
+  v8::MaybeLocal<v8::Value> result;
+  result = script->Run(context);
+}
+
+// main to make compiler happy before other patch will be landed.
+int main(int argc, char* argv[]) { return 0; }