| // Copyright 2014 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. |
| |
| #ifndef GIN_PUBLIC_V8_PLATFORM_H_ |
| #define GIN_PUBLIC_V8_PLATFORM_H_ |
| |
| #include "base/allocator/buildflags.h" |
| #include "base/compiler_specific.h" |
| #include "base/lazy_instance.h" |
| #include "gin/gin_export.h" |
| #include "gin/v8_platform_page_allocator.h" |
| #include "v8/include/v8-platform.h" |
| |
| namespace gin { |
| |
| // A v8::Platform implementation to use with gin. |
| class GIN_EXPORT V8Platform : public v8::Platform { |
| public: |
| V8Platform(const V8Platform&) = delete; |
| V8Platform& operator=(const V8Platform&) = delete; |
| |
| static V8Platform* Get(); |
| |
| // v8::Platform implementation. |
| // Some configurations do not use page_allocator. |
| #if BUILDFLAG(USE_PARTITION_ALLOC) |
| // GetPageAllocator returns gin::PageAllocator instead of v8::PageAllocator, |
| // so we can be sure that the allocator used employs security features such as |
| // enabling Arm's Branch Target Instructions for executable pages. This is |
| // verified in the tests for gin::PageAllocator. |
| PageAllocator* GetPageAllocator() override; |
| void OnCriticalMemoryPressure() override; |
| v8::ZoneBackingAllocator* GetZoneBackingAllocator() override; |
| #endif |
| |
| std::shared_ptr<v8::TaskRunner> GetForegroundTaskRunner( |
| v8::Isolate*) override; |
| int NumberOfWorkerThreads() override; |
| void CallOnWorkerThread(std::unique_ptr<v8::Task> task) override; |
| void CallBlockingTaskOnWorkerThread(std::unique_ptr<v8::Task> task) override; |
| void CallLowPriorityTaskOnWorkerThread( |
| std::unique_ptr<v8::Task> task) override; |
| void CallDelayedOnWorkerThread(std::unique_ptr<v8::Task> task, |
| double delay_in_seconds) override; |
| std::unique_ptr<v8::JobHandle> PostJob( |
| v8::TaskPriority priority, |
| std::unique_ptr<v8::JobTask> job_task) override; |
| bool IdleTasksEnabled(v8::Isolate* isolate) override; |
| double MonotonicallyIncreasingTime() override; |
| double CurrentClockTimeMillis() override; |
| StackTracePrinter GetStackTracePrinter() override; |
| v8::TracingController* GetTracingController() override; |
| |
| private: |
| friend struct base::LazyInstanceTraitsBase<V8Platform>; |
| |
| V8Platform(); |
| ~V8Platform() override; |
| |
| class TracingControllerImpl; |
| std::unique_ptr<TracingControllerImpl> tracing_controller_; |
| }; |
| |
| } // namespace gin |
| |
| #endif // GIN_PUBLIC_V8_PLATFORM_H_ |