1 files changed, 66 insertions, 0 deletions
diff --git a/deps/v8/src/heap/cppgc/prefinalizer-handler.cc b/deps/v8/src/heap/cppgc/prefinalizer-handler.cc
new file mode 100644
index 00000000000..40107c15262
--- /dev/null
+++ b/deps/v8/src/heap/cppgc/prefinalizer-handler.cc
@@ -0,0 +1,66 @@
+// 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/cppgc/prefinalizer-handler.h"
+
+#include <algorithm>
+#include <memory>
+
+#include "src/base/platform/platform.h"
+#include "src/heap/cppgc/heap.h"
+
+namespace cppgc {
+namespace internal {
+
+// static
+void PreFinalizerRegistrationDispatcher::RegisterPrefinalizer(
+    cppgc::Heap* heap, PreFinalizer prefinalzier) {
+  internal::Heap::From(heap)->prefinalizer_handler()->RegisterPrefinalizer(
+      prefinalzier);
+}
+
+bool PreFinalizerRegistrationDispatcher::PreFinalizer::operator==(
+    const PreFinalizer& other) {
+  return (object_ == other.object_) && (callback_ == other.callback_);
+}
+
+PreFinalizerHandler::PreFinalizerHandler()
+#ifdef DEBUG
+    : creation_thread_id_(v8::base::OS::GetCurrentThreadId())
+#endif
+{
+}
+
+void PreFinalizerHandler::RegisterPrefinalizer(PreFinalizer prefinalizer) {
+  DCHECK(CurrentThreadIsCreationThread());
+  DCHECK_EQ(ordered_pre_finalizers_.end(),
+            std::find(ordered_pre_finalizers_.begin(),
+                      ordered_pre_finalizers_.end(), prefinalizer));
+  ordered_pre_finalizers_.push_back(prefinalizer);
+}
+
+void PreFinalizerHandler::InvokePreFinalizers() {
+  DCHECK(CurrentThreadIsCreationThread());
+  LivenessBroker liveness_broker = LivenessBrokerFactory::Create();
+  ordered_pre_finalizers_.erase(
+      ordered_pre_finalizers_.begin(),
+      std::remove_if(ordered_pre_finalizers_.rbegin(),
+                     ordered_pre_finalizers_.rend(),
+                     [liveness_broker](const PreFinalizer& pf) {
+                       return (pf.callback_)(liveness_broker, pf.object_);
+                     })
+          .base());
+  ordered_pre_finalizers_.shrink_to_fit();
+}
+
+bool PreFinalizerHandler::CurrentThreadIsCreationThread() {
+#ifdef DEBUG
+  return creation_thread_id_ == v8::base::OS::GetCurrentThreadId();
+#else
+  return true;
+#endif
+}
+
+}  // namespace internal
+}  // namespace cppgc