src: Node implementation of v8::Platform

deps/v8/include/libplatform/libplatform.h

@@ -30,12 +30,15 @@ enum class MessageLoopBehavior : bool {
  * If |idle_task_support| is enabled then the platform will accept idle
  * tasks (IdleTasksEnabled will return true) and will rely on the embedder
  * calling v8::platform::RunIdleTasks to process the idle tasks.
+ * If |tracing_controller| is nullptr, the default platform will create a
+ * v8::platform::TracingController instance and use it.
  */
 V8_PLATFORM_EXPORT v8::Platform* CreateDefaultPlatform(
     int thread_pool_size = 0,
     IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled,
     InProcessStackDumping in_process_stack_dumping =
-        InProcessStackDumping::kEnabled);
+        InProcessStackDumping::kEnabled,
+    v8::TracingController* tracing_controller = nullptr);
 
 /**
  * Pumps the message loop for the given isolate.
@@ -67,6 +70,8 @@ V8_PLATFORM_EXPORT void RunIdleTasks(v8::Platform* platform,
  * Attempts to set the tracing controller for the given platform.
  *
  * The |platform| has to be created using |CreateDefaultPlatform|.
+ *
+ * DEPRECATED: Will be removed soon.
  */
 V8_PLATFORM_EXPORT void SetTracingController(
     v8::Platform* platform,

deps/v8/include/libplatform/v8-tracing.h

@@ -209,7 +209,15 @@ class V8_PLATFORM_EXPORT TraceConfig {
   void operator=(const TraceConfig&) = delete;
 };
 
-class V8_PLATFORM_EXPORT TracingController {
+#if defined(_MSC_VER)
+#define V8_PLATFORM_NON_EXPORTED_BASE(code) \
+  __pragma(warning(suppress : 4275)) code
+#else
+#define V8_PLATFORM_NON_EXPORTED_BASE(code) code
+#endif  // defined(_MSC_VER)
+
+class V8_PLATFORM_EXPORT TracingController
+    : public V8_PLATFORM_NON_EXPORTED_BASE(v8::TracingController) {
  public:
   enum Mode { DISABLED = 0, RECORDING_MODE };
 
@@ -227,25 +235,29 @@ class V8_PLATFORM_EXPORT TracingController {
   };
 
   TracingController();
-  ~TracingController();
+  ~TracingController() override;
   void Initialize(TraceBuffer* trace_buffer);
-  const uint8_t* GetCategoryGroupEnabled(const char* category_group);
-  static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag);
+
+  // v8::TracingController implementation.
+  const uint8_t* GetCategoryGroupEnabled(const char* category_group) override;
   uint64_t AddTraceEvent(
       char phase, const uint8_t* category_enabled_flag, const char* name,
       const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
       const char** arg_names, const uint8_t* arg_types,
       const uint64_t* arg_values,
       std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
-      unsigned int flags);
+      unsigned int flags) override;
   void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
-                                const char* name, uint64_t handle);
+                                const char* name, uint64_t handle) override;
+  void AddTraceStateObserver(
+      v8::TracingController::TraceStateObserver* observer) override;
+  void RemoveTraceStateObserver(
+      v8::TracingController::TraceStateObserver* observer) override;
 
   void StartTracing(TraceConfig* trace_config);
   void StopTracing();
 
-  void AddTraceStateObserver(Platform::TraceStateObserver* observer);
-  void RemoveTraceStateObserver(Platform::TraceStateObserver* observer);
+  static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag);
 
  private:
   const uint8_t* GetCategoryGroupEnabledInternal(const char* category_group);
@@ -255,14 +267,16 @@ class V8_PLATFORM_EXPORT TracingController {
   std::unique_ptr<TraceBuffer> trace_buffer_;
   std::unique_ptr<TraceConfig> trace_config_;
   std::unique_ptr<base::Mutex> mutex_;
-  std::unordered_set<Platform::TraceStateObserver*> observers_;
+  std::unordered_set<v8::TracingController::TraceStateObserver*> observers_;
   Mode mode_ = DISABLED;
 
   // Disallow copy and assign
   TracingController(const TracingController&) = delete;
   void operator=(const TracingController&) = delete;
 };
 
+#undef V8_PLATFORM_NON_EXPORTED_BASE
+
 }  // namespace tracing
 }  // namespace platform
 }  // namespace v8

deps/v8/include/v8-platform.h

@@ -52,6 +52,66 @@ class ConvertableToTraceFormat {
   virtual void AppendAsTraceFormat(std::string* out) const = 0;
 };
 
+/**
+ * V8 Tracing controller.
+ *
+ * Can be implemented by an embedder to record trace events from V8.
+ */
+class TracingController {
+ public:
+  virtual ~TracingController() = default;
+
+  /**
+   * Called by TRACE_EVENT* macros, don't call this directly.
+   * The name parameter is a category group for example:
+   * TRACE_EVENT0("v8,parse", "V8.Parse")
+   * The pointer returned points to a value with zero or more of the bits
+   * defined in CategoryGroupEnabledFlags.
+   **/
+  virtual const uint8_t* GetCategoryGroupEnabled(const char* name) {
+    static uint8_t no = 0;
+    return &no;
+  }
+
+  /**
+   * Adds a trace event to the platform tracing system. This function call is
+   * usually the result of a TRACE_* macro from trace_event_common.h when
+   * tracing and the category of the particular trace are enabled. It is not
+   * advisable to call this function on its own; it is really only meant to be
+   * used by the trace macros. The returned handle can be used by
+   * UpdateTraceEventDuration to update the duration of COMPLETE events.
+   */
+  virtual uint64_t AddTraceEvent(
+      char phase, const uint8_t* category_enabled_flag, const char* name,
+      const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
+      const char** arg_names, const uint8_t* arg_types,
+      const uint64_t* arg_values,
+      std::unique_ptr<ConvertableToTraceFormat>* arg_convertables,
+      unsigned int flags) {
+    return 0;
+  }
+
+  /**
+   * Sets the duration field of a COMPLETE trace event. It must be called with
+   * the handle returned from AddTraceEvent().
+   **/
+  virtual void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
+                                        const char* name, uint64_t handle) {}
+
+  class TraceStateObserver {
+   public:
+    virtual ~TraceStateObserver() = default;
+    virtual void OnTraceEnabled() = 0;
+    virtual void OnTraceDisabled() = 0;
+  };
+
+  /** Adds tracing state change observer. */
+  virtual void AddTraceStateObserver(TraceStateObserver*) {}
+
+  /** Removes tracing state change observer. */
+  virtual void RemoveTraceStateObserver(TraceStateObserver*) {}
+};
+
 /**
  * V8 Platform abstraction layer.
  *
@@ -135,6 +195,20 @@ class Platform {
    * the epoch.
    **/
   virtual double MonotonicallyIncreasingTime() = 0;
+  typedef void (*StackTracePrinter)();
+
+  /**
+   * Returns a function pointer that print a stack trace of the current stack
+   * on invocation. Disables printing of the stack trace if nullptr.
+   */
+  virtual StackTracePrinter GetStackTracePrinter() { return nullptr; }
+
+  /**
+   * Returns an instance of a v8::TracingController. This must be non-nullptr.
+   */
+  virtual TracingController* GetTracingController() = 0;
+
+  // DEPRECATED methods, use TracingController interface instead.
 
   /**
    * Called by TRACE_EVENT* macros, don't call this directly.
@@ -200,26 +274,13 @@ class Platform {
   virtual void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
                                         const char* name, uint64_t handle) {}
 
-  class TraceStateObserver {
-   public:
-    virtual ~TraceStateObserver() = default;
-    virtual void OnTraceEnabled() = 0;
-    virtual void OnTraceDisabled() = 0;
-  };
+  typedef v8::TracingController::TraceStateObserver TraceStateObserver;
 
   /** Adds tracing state change observer. */
   virtual void AddTraceStateObserver(TraceStateObserver*) {}
 
   /** Removes tracing state change observer. */
   virtual void RemoveTraceStateObserver(TraceStateObserver*) {}
-
-  typedef void (*StackTracePrinter)();
-
-  /**
-   * Returns a function pointer that print a stack trace of the current stack
-   * on invocation. Disables printing of the stack trace if nullptr.
-   */
-  virtual StackTracePrinter GetStackTracePrinter() { return nullptr; }
 };
 
 }  // namespace v8

deps/v8/src/cancelable-task.cc

@@ -29,18 +29,17 @@ Cancelable::~Cancelable() {
 CancelableTaskManager::CancelableTaskManager()
     : task_id_counter_(0), canceled_(false) {}
 
-uint32_t CancelableTaskManager::Register(Cancelable* task) {
+CancelableTaskManager::Id CancelableTaskManager::Register(Cancelable* task) {
   base::LockGuard<base::Mutex> guard(&mutex_);
-  uint32_t id = ++task_id_counter_;
-  // The loop below is just used when task_id_counter_ overflows.
-  while (cancelable_tasks_.count(id) > 0) ++id;
+  CancelableTaskManager::Id id = ++task_id_counter_;
+  // Id overflows are not supported.
+  CHECK_NE(0, id);
   CHECK(!canceled_);
   cancelable_tasks_[id] = task;
   return id;
 }
 
-
-void CancelableTaskManager::RemoveFinishedTask(uint32_t id) {
+void CancelableTaskManager::RemoveFinishedTask(CancelableTaskManager::Id id) {
   base::LockGuard<base::Mutex> guard(&mutex_);
   size_t removed = cancelable_tasks_.erase(id);
   USE(removed);
@@ -49,7 +48,7 @@ void CancelableTaskManager::RemoveFinishedTask(uint32_t id) {
 }
 
 CancelableTaskManager::TryAbortResult CancelableTaskManager::TryAbort(
-    uint32_t id) {
+    CancelableTaskManager::Id id) {
   base::LockGuard<base::Mutex> guard(&mutex_);
   auto entry = cancelable_tasks_.find(id);
   if (entry != cancelable_tasks_.end()) {

deps/v8/src/cancelable-task.h

@@ -5,7 +5,7 @@
 #ifndef V8_CANCELABLE_TASK_H_
 #define V8_CANCELABLE_TASK_H_
 
-#include <map>
+#include <unordered_map>
 
 #include "include/v8-platform.h"
 #include "src/base/atomic-utils.h"
@@ -24,12 +24,14 @@ class Isolate;
 // from any fore- and background task/thread.
 class V8_EXPORT_PRIVATE CancelableTaskManager {
  public:
+  using Id = uint64_t;
+
   CancelableTaskManager();
 
   // Registers a new cancelable {task}. Returns the unique {id} of the task that
   // can be used to try to abort a task by calling {Abort}.
   // Must not be called after CancelAndWait.
-  uint32_t Register(Cancelable* task);
+  Id Register(Cancelable* task);
 
   // Try to abort running a task identified by {id}. The possible outcomes are:
   // (1) The task is already finished running or was canceled before and
@@ -39,7 +41,7 @@ class V8_EXPORT_PRIVATE CancelableTaskManager {
   //     removed.
   //
   enum TryAbortResult { kTaskRemoved, kTaskRunning, kTaskAborted };
-  TryAbortResult TryAbort(uint32_t id);
+  TryAbortResult TryAbort(Id id);
 
   // Cancels all remaining registered tasks and waits for tasks that are
   // already running. This disallows subsequent Register calls.
@@ -59,13 +61,13 @@ class V8_EXPORT_PRIVATE CancelableTaskManager {
  private:
   // Only called by {Cancelable} destructor. The task is done with executing,
   // but needs to be removed.
-  void RemoveFinishedTask(uint32_t id);
+  void RemoveFinishedTask(Id id);
 
   // To mitigate the ABA problem, the api refers to tasks through an id.
-  uint32_t task_id_counter_;
+  Id task_id_counter_;
 
   // A set of cancelable tasks that are currently registered.
-  std::map<uint32_t, Cancelable*> cancelable_tasks_;
+  std::unordered_map<Id, Cancelable*> cancelable_tasks_;
 
   // Mutex and condition variable enabling concurrent register and removing, as
   // well as waiting for background tasks on {CancelAndWait}.
@@ -89,7 +91,7 @@ class V8_EXPORT_PRIVATE Cancelable {
   // a platform. This step transfers ownership to the platform, which destroys
   // the task after running it. Since the exact time is not known, we cannot
   // access the object after handing it to a platform.
-  uint32_t id() { return id_; }
+  CancelableTaskManager::Id id() { return id_; }
 
  protected:
   bool TryRun() { return status_.TrySetValue(kWaiting, kRunning); }
@@ -120,7 +122,7 @@ class V8_EXPORT_PRIVATE Cancelable {
 
   CancelableTaskManager* parent_;
   base::AtomicValue<Status> status_;
-  uint32_t id_;
+  CancelableTaskManager::Id id_;
 
   // The counter is incremented for failing tries to cancel a task. This can be
   // used by the task itself as an indication how often external entities tried

deps/v8/src/d8.cc

@@ -225,6 +225,10 @@ class PredictablePlatform : public Platform {
     return synthetic_time_in_sec_ += 0.00001;
   }
 
+  v8::TracingController* GetTracingController() override {
+    return platform_->GetTracingController();
+  }
+
   using Platform::AddTraceEvent;
   uint64_t AddTraceEvent(char phase, const uint8_t* categoryEnabledFlag,
                          const char* name, const char* scope, uint64_t id,
@@ -3063,18 +3067,7 @@ int Shell::Main(int argc, char* argv[]) {
   if (!SetOptions(argc, argv)) return 1;
   v8::V8::InitializeICUDefaultLocation(argv[0], options.icu_data_file);
 
-  v8::platform::InProcessStackDumping in_process_stack_dumping =
-      options.disable_in_process_stack_traces
-          ? v8::platform::InProcessStackDumping::kDisabled
-          : v8::platform::InProcessStackDumping::kEnabled;
-
-  g_platform = i::FLAG_verify_predictable
-                   ? new PredictablePlatform()
-                   : v8::platform::CreateDefaultPlatform(
-                         0, v8::platform::IdleTaskSupport::kEnabled,
-                         in_process_stack_dumping);
-
-  platform::tracing::TracingController* tracing_controller;
+  platform::tracing::TracingController* tracing_controller = nullptr;
   if (options.trace_enabled) {
     trace_file.open("v8_trace.json");
     tracing_controller = new platform::tracing::TracingController();
@@ -3083,11 +3076,20 @@ int Shell::Main(int argc, char* argv[]) {
             platform::tracing::TraceBuffer::kRingBufferChunks,
             platform::tracing::TraceWriter::CreateJSONTraceWriter(trace_file));
     tracing_controller->Initialize(trace_buffer);
-    if (!i::FLAG_verify_predictable) {
-      platform::SetTracingController(g_platform, tracing_controller);
-    }
   }
 
+  v8::platform::InProcessStackDumping in_process_stack_dumping =
+      options.disable_in_process_stack_traces
+          ? v8::platform::InProcessStackDumping::kDisabled
+          : v8::platform::InProcessStackDumping::kEnabled;
+
+  g_platform = i::FLAG_verify_predictable
+                   ? new PredictablePlatform()
+                   : v8::platform::CreateDefaultPlatform(
+                         0, v8::platform::IdleTaskSupport::kEnabled,
+                         in_process_stack_dumping,
+                         tracing_controller);
+
   v8::V8::InitializePlatform(g_platform);
   v8::V8::Initialize();
   if (options.natives_blob || options.snapshot_blob) {

deps/v8/src/heap/heap.cc

@@ -161,6 +161,7 @@ Heap::Heap()
       heap_iterator_depth_(0),
       local_embedder_heap_tracer_(nullptr),
       fast_promotion_mode_(false),
+      use_tasks_(true),
       force_oom_(false),
       delay_sweeper_tasks_for_testing_(false),
       pending_layout_change_object_(nullptr) {
@@ -5823,6 +5824,7 @@ void Heap::RegisterExternallyReferencedObject(Object** object) {
 }
 
 void Heap::TearDown() {
+  use_tasks_ = false;
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
     Verify();