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1// Copyright 2020 the V8 project authors. All rights reserved.2// Use of this source code is governed by a BSD-style license that can be3// found in the LICENSE file.4 5#ifndef INCLUDE_CPPGC_DEFAULT_PLATFORM_H_6#define INCLUDE_CPPGC_DEFAULT_PLATFORM_H_7 8#include <memory>9 10#include "cppgc/platform.h"11#include "libplatform/libplatform.h"12#include "v8config.h"  // NOLINT(build/include_directory)13 14namespace cppgc {15 16/**17 * Platform provided by cppgc. Uses V8's DefaultPlatform provided by18 * libplatform internally. Exception: `GetForegroundTaskRunner()`, see below.19 */20class V8_EXPORT DefaultPlatform : public Platform {21 public:22  using IdleTaskSupport = v8::platform::IdleTaskSupport;23  explicit DefaultPlatform(24      int thread_pool_size = 0,25      IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled,26      std::unique_ptr<TracingController> tracing_controller = {})27      : v8_platform_(v8::platform::NewDefaultPlatform(28            thread_pool_size, idle_task_support,29            v8::platform::InProcessStackDumping::kDisabled,30            std::move(tracing_controller))) {}31 32  cppgc::PageAllocator* GetPageAllocator() override {33    return v8_platform_->GetPageAllocator();34  }35 36  double MonotonicallyIncreasingTime() override {37    return v8_platform_->MonotonicallyIncreasingTime();38  }39 40  std::shared_ptr<cppgc::TaskRunner> GetForegroundTaskRunner(41      TaskPriority priority) override {42    // V8's default platform creates a new task runner when passed the43    // `v8::Isolate` pointer the first time. For non-default platforms this will44    // require getting the appropriate task runner.45    return v8_platform_->GetForegroundTaskRunner(kNoIsolate, priority);46  }47 48  std::unique_ptr<cppgc::JobHandle> PostJob(49      cppgc::TaskPriority priority,50      std::unique_ptr<cppgc::JobTask> job_task) override {51    return v8_platform_->PostJob(priority, std::move(job_task));52  }53 54  TracingController* GetTracingController() override {55    return v8_platform_->GetTracingController();56  }57 58  v8::Platform* GetV8Platform() const { return v8_platform_.get(); }59 60 protected:61  static constexpr v8::Isolate* kNoIsolate = nullptr;62 63  std::unique_ptr<v8::Platform> v8_platform_;64};65 66}  // namespace cppgc67 68#endif  // INCLUDE_CPPGC_DEFAULT_PLATFORM_H_69