deps: V8: cherry-pick 55a01ec7519a

Original commit message:

    Reland "[weakrefs] Schedule FinalizationGroup cleanup tasks from within V8"

    Deprecate the following explicit FinalizationGroup APIs in favor of
    automatic handling of FinalizationGroup cleanup callbacks:
      - v8::Isolate::SetHostCleanupFinalizationGroupCallback
      - v8::FinaliationGroup::Cleanup

    If no HostCleanupFinalizationGroupCallback is set, then
    FinalizationGroup cleanup callbacks are automatically scheduled by V8
    itself as non-nestable foreground tasks.

    When a Context being disposed, all FinalizationGroups that are
    associated with it are removed from the dirty list, cancelling
    scheduled cleanup.

    This is a reland of 31d8ff7ac5f4a91099f2f06f01e43e9e7aa79bc4

    Bug: v8:8179, v8:10190
    Change-Id: I704ecf48aeebac1dc2c05ea1c052f6a2560ae332
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2045723
    Commit-Queue: Shu-yu Guo <syg@chromium.org>
    Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66208}

Refs: v8/v8@55a01ec

PR-URL: #32885
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ujjwal Sharma <ryzokuken@disroot.org>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>

Author: addaleax

common.gypi

@@ -35,7 +35,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.21',
+    'v8_embedder_string': '-node.22',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/BUILD.gn

@@ -2298,6 +2298,8 @@ v8_source_set("v8_base_without_compiler") {
     "src/heap/factory-inl.h",
     "src/heap/factory.cc",
     "src/heap/factory.h",
+    "src/heap/finalization-group-cleanup-task.cc",
+    "src/heap/finalization-group-cleanup-task.h",
     "src/heap/gc-idle-time-handler.cc",
     "src/heap/gc-idle-time-handler.h",
     "src/heap/gc-tracer.cc",

deps/v8/include/v8.h

@@ -5885,6 +5885,9 @@ class V8_EXPORT FinalizationGroup : public Object {
    * occurred. Otherwise the result is |true| if the cleanup callback
    * was called successfully. The result is never |false|.
    */
+  V8_DEPRECATED(
+      "FinalizationGroup cleanup is automatic if "
+      "HostCleanupFinalizationGroupCallback is not set")
   static V8_WARN_UNUSED_RESULT Maybe<bool> Cleanup(
       Local<FinalizationGroup> finalization_group);
 };
@@ -8444,6 +8447,9 @@ class V8_EXPORT Isolate {
    * are ready to be cleaned up and require FinalizationGroup::Cleanup()
    * to be called in a future task.
    */
+  V8_DEPRECATED(
+      "FinalizationGroup cleanup is automatic if "
+      "HostCleanupFinalizationGroupCallback is not set")
   void SetHostCleanupFinalizationGroupCallback(
       HostCleanupFinalizationGroupCallback callback);
 
@@ -9056,10 +9062,10 @@ class V8_EXPORT Isolate {
   void LowMemoryNotification();
 
   /**
-   * Optional notification that a context has been disposed. V8 uses
-   * these notifications to guide the GC heuristic. Returns the number
-   * of context disposals - including this one - since the last time
-   * V8 had a chance to clean up.
+   * Optional notification that a context has been disposed. V8 uses these
+   * notifications to guide the GC heuristic and cancel FinalizationGroup
+   * cleanup tasks. Returns the number of context disposals - including this one
+   * - since the last time V8 had a chance to clean up.
    *
    * The optional parameter |dependant_context| specifies whether the disposed
    * context was depending on state from other contexts or not.

deps/v8/src/api/api.cc

@@ -10950,6 +10950,26 @@ void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
   callback(info);
 }
 
+void InvokeFinalizationGroupCleanupFromTask(
+    Handle<Context> context, Handle<JSFinalizationGroup> finalization_group,
+    Handle<Object> callback) {
+  Isolate* isolate = finalization_group->native_context().GetIsolate();
+  RuntimeCallTimerScope timer(
+      isolate, RuntimeCallCounterId::kFinalizationGroupCleanupFromTask);
+  // Do not use ENTER_V8 because this is always called from a running
+  // FinalizationGroupCleanupTask within V8 and we should not log it as an API
+  // call. This method is implemented here to avoid duplication of the exception
+  // handling and microtask running logic in CallDepthScope.
+  if (IsExecutionTerminatingCheck(isolate)) return;
+  Local<v8::Context> api_context = Utils::ToLocal(context);
+  CallDepthScope<true> call_depth_scope(isolate, api_context);
+  VMState<OTHER> state(isolate);
+  if (JSFinalizationGroup::Cleanup(isolate, finalization_group, callback)
+          .IsNothing()) {
+    call_depth_scope.Escape();
+  }
+}
+
 // Undefine macros for jumbo build.
 #undef LOG_API
 #undef ENTER_V8_DO_NOT_USE

deps/v8/src/api/api.h

@@ -26,6 +26,7 @@ namespace v8 {
 
 namespace internal {
 class JSArrayBufferView;
+class JSFinalizationGroup;
 }  // namespace internal
 
 namespace debug {
@@ -561,6 +562,10 @@ void InvokeAccessorGetterCallback(
 void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
                             v8::FunctionCallback callback);
 
+void InvokeFinalizationGroupCleanupFromTask(
+    Handle<Context> context, Handle<JSFinalizationGroup> finalization_group,
+    Handle<Object> callback);
+
 }  // namespace internal
 }  // namespace v8
 

deps/v8/src/builtins/builtins-weak-refs.cc

@@ -148,9 +148,8 @@ BUILTIN(FinalizationGroupCleanupSome) {
     callback = callback_obj;
   }
 
-  // Don't do set_scheduled_for_cleanup(false); we still have the microtask
-  // scheduled and don't want to schedule another one in case the user never
-  // executes microtasks.
+  // Don't do set_scheduled_for_cleanup(false); we still have the task
+  // scheduled.
   if (JSFinalizationGroup::Cleanup(isolate, finalization_group, callback)
           .IsNothing()) {
     DCHECK(isolate->has_pending_exception());

deps/v8/src/d8/d8.cc

@@ -916,16 +916,6 @@ MaybeLocal<Promise> Shell::HostImportModuleDynamically(
   return MaybeLocal<Promise>();
 }
 
-void Shell::HostCleanupFinalizationGroup(Local<Context> context,
-                                         Local<FinalizationGroup> fg) {
-  Isolate* isolate = context->GetIsolate();
-  PerIsolateData::Get(isolate)->HostCleanupFinalizationGroup(fg);
-}
-
-void PerIsolateData::HostCleanupFinalizationGroup(Local<FinalizationGroup> fg) {
-  cleanup_finalization_groups_.emplace(isolate_, fg);
-}
-
 void Shell::HostInitializeImportMetaObject(Local<Context> context,
                                            Local<Module> module,
                                            Local<Object> meta) {
@@ -1123,15 +1113,6 @@ MaybeLocal<Context> PerIsolateData::GetTimeoutContext() {
   return result;
 }
 
-MaybeLocal<FinalizationGroup> PerIsolateData::GetCleanupFinalizationGroup() {
-  if (cleanup_finalization_groups_.empty())
-    return MaybeLocal<FinalizationGroup>();
-  Local<FinalizationGroup> result =
-      cleanup_finalization_groups_.front().Get(isolate_);
-  cleanup_finalization_groups_.pop();
-  return result;
-}
-
 PerIsolateData::RealmScope::RealmScope(PerIsolateData* data) : data_(data) {
   data_->realm_count_ = 1;
   data_->realm_current_ = 0;
@@ -1281,8 +1262,11 @@ void Shell::DisposeRealm(const v8::FunctionCallbackInfo<v8::Value>& args,
                          int index) {
   Isolate* isolate = args.GetIsolate();
   PerIsolateData* data = PerIsolateData::Get(isolate);
-  DisposeModuleEmbedderData(data->realms_[index].Get(isolate));
+  Local<Context> context = data->realms_[index].Get(isolate);
+  DisposeModuleEmbedderData(context);
   data->realms_[index].Reset();
+  // ContextDisposedNotification expects the disposed context to be entered.
+  v8::Context::Scope scope(context);
   isolate->ContextDisposedNotification();
   isolate->IdleNotificationDeadline(g_platform->MonotonicallyIncreasingTime());
 }
@@ -2742,8 +2726,6 @@ void SourceGroup::ExecuteInThread() {
   Isolate::CreateParams create_params;
   create_params.array_buffer_allocator = Shell::array_buffer_allocator;
   Isolate* isolate = Isolate::New(create_params);
-  isolate->SetHostCleanupFinalizationGroupCallback(
-      Shell::HostCleanupFinalizationGroup);
   isolate->SetHostImportModuleDynamicallyCallback(
       Shell::HostImportModuleDynamically);
   isolate->SetHostInitializeImportMetaObjectCallback(
@@ -2889,8 +2871,6 @@ void Worker::ExecuteInThread() {
   Isolate::CreateParams create_params;
   create_params.array_buffer_allocator = Shell::array_buffer_allocator;
   Isolate* isolate = Isolate::New(create_params);
-  isolate->SetHostCleanupFinalizationGroupCallback(
-      Shell::HostCleanupFinalizationGroup);
   isolate->SetHostImportModuleDynamicallyCallback(
       Shell::HostImportModuleDynamically);
   isolate->SetHostInitializeImportMetaObjectCallback(
@@ -3272,21 +3252,6 @@ bool RunSetTimeoutCallback(Isolate* isolate, bool* did_run) {
   return true;
 }
 
-bool RunCleanupFinalizationGroupCallback(Isolate* isolate, bool* did_run) {
-  PerIsolateData* data = PerIsolateData::Get(isolate);
-  HandleScope handle_scope(isolate);
-  while (true) {
-    Local<FinalizationGroup> fg;
-    if (!data->GetCleanupFinalizationGroup().ToLocal(&fg)) return true;
-    *did_run = true;
-    TryCatch try_catch(isolate);
-    try_catch.SetVerbose(true);
-    if (FinalizationGroup::Cleanup(fg).IsNothing()) {
-      return false;
-    }
-  }
-}
-
 bool ProcessMessages(
     Isolate* isolate,
     const std::function<platform::MessageLoopBehavior()>& behavior) {
@@ -3302,17 +3267,12 @@ bool ProcessMessages(
       v8::platform::RunIdleTasks(g_default_platform, isolate,
                                  50.0 / base::Time::kMillisecondsPerSecond);
     }
-    bool ran_finalization_callback = false;
-    if (!RunCleanupFinalizationGroupCallback(isolate,
-                                             &ran_finalization_callback)) {
-      return false;
-    }
     bool ran_set_timeout = false;
     if (!RunSetTimeoutCallback(isolate, &ran_set_timeout)) {
       return false;
     }
 
-    if (!ran_set_timeout && !ran_finalization_callback) return true;
+    if (!ran_set_timeout) return true;
   }
   return true;
 }
@@ -3767,8 +3727,6 @@ int Shell::Main(int argc, char* argv[]) {
   }
 
   Isolate* isolate = Isolate::New(create_params);
-  isolate->SetHostCleanupFinalizationGroupCallback(
-      Shell::HostCleanupFinalizationGroup);
   isolate->SetHostImportModuleDynamicallyCallback(
       Shell::HostImportModuleDynamically);
   isolate->SetHostInitializeImportMetaObjectCallback(
@@ -3831,8 +3789,6 @@ int Shell::Main(int argc, char* argv[]) {
       i::FLAG_hash_seed ^= 1337;  // Use a different hash seed.
       Isolate* isolate2 = Isolate::New(create_params);
       i::FLAG_hash_seed ^= 1337;  // Restore old hash seed.
-      isolate2->SetHostCleanupFinalizationGroupCallback(
-          Shell::HostCleanupFinalizationGroup);
       isolate2->SetHostImportModuleDynamicallyCallback(
           Shell::HostImportModuleDynamically);
       isolate2->SetHostInitializeImportMetaObjectCallback(

deps/v8/src/d8/d8.h

@@ -226,8 +226,6 @@ class PerIsolateData {
     PerIsolateData* data_;
   };
 
-  inline void HostCleanupFinalizationGroup(Local<FinalizationGroup> fg);
-  inline MaybeLocal<FinalizationGroup> GetCleanupFinalizationGroup();
   inline void SetTimeout(Local<Function> callback, Local<Context> context);
   inline MaybeLocal<Function> GetTimeoutCallback();
   inline MaybeLocal<Context> GetTimeoutContext();
@@ -245,7 +243,6 @@ class PerIsolateData {
   Global<Value> realm_shared_;
   std::queue<Global<Function>> set_timeout_callbacks_;
   std::queue<Global<Context>> set_timeout_contexts_;
-  std::queue<Global<FinalizationGroup>> cleanup_finalization_groups_;
   AsyncHooks* async_hooks_wrapper_;
 
   int RealmIndexOrThrow(const v8::FunctionCallbackInfo<v8::Value>& args,
@@ -423,8 +420,6 @@ class Shell : public i::AllStatic {
   static void SetUMask(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void MakeDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RemoveDirectory(const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void HostCleanupFinalizationGroup(Local<Context> context,
-                                           Local<FinalizationGroup> fg);
   static MaybeLocal<Promise> HostImportModuleDynamically(
       Local<Context> context, Local<ScriptOrModule> referrer,
       Local<String> specifier);

deps/v8/src/execution/isolate.h

@@ -1391,6 +1391,10 @@ class Isolate final : private HiddenFactory {
   void ClearKeptObjects();
   void SetHostCleanupFinalizationGroupCallback(
       HostCleanupFinalizationGroupCallback callback);
+  HostCleanupFinalizationGroupCallback
+  host_cleanup_finalization_group_callback() const {
+    return host_cleanup_finalization_group_callback_;
+  }
   void RunHostCleanupFinalizationGroupCallback(Handle<JSFinalizationGroup> fg);
 
   void SetHostImportModuleDynamicallyCallback(

deps/v8/src/heap/finalization-group-cleanup-task.cc

@@ -0,0 +1,74 @@
+// Copyright 2020 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 "src/heap/finalization-group-cleanup-task.h"
+
+#include "src/execution/frames.h"
+#include "src/execution/interrupts-scope.h"
+#include "src/execution/stack-guard.h"
+#include "src/execution/v8threads.h"
+#include "src/heap/heap-inl.h"
+#include "src/objects/js-weak-refs-inl.h"
+#include "src/tracing/trace-event.h"
+
+namespace v8 {
+namespace internal {
+
+FinalizationGroupCleanupTask::FinalizationGroupCleanupTask(Heap* heap)
+    : heap_(heap) {}
+
+void FinalizationGroupCleanupTask::SlowAssertNoActiveJavaScript() {
+#ifdef ENABLE_SLOW_DCHECKS
+  class NoActiveJavaScript : public ThreadVisitor {
+   public:
+    void VisitThread(Isolate* isolate, ThreadLocalTop* top) override {
+      for (StackFrameIterator it(isolate, top); !it.done(); it.Advance()) {
+        DCHECK(!it.frame()->is_java_script());
+      }
+    }
+  };
+  NoActiveJavaScript no_active_js_visitor;
+  Isolate* isolate = heap_->isolate();
+  no_active_js_visitor.VisitThread(isolate, isolate->thread_local_top());
+  isolate->thread_manager()->IterateArchivedThreads(&no_active_js_visitor);
+#endif  // ENABLE_SLOW_DCHECKS
+}
+
+void FinalizationGroupCleanupTask::Run() {
+  Isolate* isolate = heap_->isolate();
+  DCHECK(!isolate->host_cleanup_finalization_group_callback());
+  SlowAssertNoActiveJavaScript();
+
+  TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8",
+                                "V8.FinalizationGroupCleanupTask");
+
+  HandleScope handle_scope(isolate);
+  Handle<JSFinalizationGroup> finalization_group;
+  // There could be no dirty FinalizationGroups. When a context is disposed by
+  // the embedder, its FinalizationGroups are removed from the dirty list.
+  if (!heap_->TakeOneDirtyJSFinalizationGroup().ToHandle(&finalization_group)) {
+    return;
+  }
+  finalization_group->set_scheduled_for_cleanup(false);
+
+  // Since FinalizationGroup cleanup callbacks are scheduled by V8, enter the
+  // FinalizationGroup's context.
+  Handle<Context> context(Context::cast(finalization_group->native_context()),
+                          isolate);
+  Handle<Object> callback(finalization_group->cleanup(), isolate);
+  v8::Context::Scope context_scope(v8::Utils::ToLocal(context));
+  v8::TryCatch catcher(reinterpret_cast<v8::Isolate*>(isolate));
+  catcher.SetVerbose(true);
+
+  // Exceptions are reported via the message handler. This is ensured by the
+  // verbose TryCatch.
+  InvokeFinalizationGroupCleanupFromTask(context, finalization_group, callback);
+
+  // Repost if there are remaining dirty FinalizationGroups.
+  heap_->set_is_finalization_group_cleanup_task_posted(false);
+  heap_->PostFinalizationGroupCleanupTaskIfNeeded();
+}
+
+}  // namespace internal
+}  // namespace v8