1 files changed, 54 insertions, 0 deletions
diff --git a/deps/v8/include/cppgc/prefinalizer.h b/deps/v8/include/cppgc/prefinalizer.h
new file mode 100644
index 00000000000..2f6d68a1dac
--- /dev/null
+++ b/deps/v8/include/cppgc/prefinalizer.h
@@ -0,0 +1,54 @@
+// 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.
+
+#ifndef INCLUDE_CPPGC_PREFINALIZER_H_
+#define INCLUDE_CPPGC_PREFINALIZER_H_
+
+#include "cppgc/internal/accessors.h"
+#include "cppgc/internal/compiler-specific.h"
+#include "cppgc/internal/prefinalizer-handler.h"
+#include "cppgc/liveness-broker.h"
+#include "cppgc/macros.h"
+
+namespace cppgc {
+
+namespace internal {
+
+template <typename T>
+class PrefinalizerRegistration final {
+ public:
+  explicit PrefinalizerRegistration(T* self) {
+    static_assert(sizeof(&T::InvokePreFinalizer) > 0,
+                  "USING_PRE_FINALIZER(T) must be defined.");
+
+    cppgc::internal::PreFinalizerRegistrationDispatcher::RegisterPrefinalizer(
+        internal::GetHeapFromPayload(self), {self, T::InvokePreFinalizer});
+  }
+
+  void* operator new(size_t, void* location) = delete;
+  void* operator new(size_t) = delete;
+};
+
+}  // namespace internal
+
+#define CPPGC_USING_PRE_FINALIZER(Class, PreFinalizer)                      \
+ public:                                                                    \
+  static bool InvokePreFinalizer(const LivenessBroker& liveness_broker,     \
+                                 void* object) {                            \
+    static_assert(internal::IsGarbageCollectedTypeV<Class>,                 \
+                  "Only garbage collected objects can have prefinalizers"); \
+    Class* self = static_cast<Class*>(object);                              \
+    if (liveness_broker.IsHeapObjectAlive(self)) return false;              \
+    self->Class::PreFinalizer();                                            \
+    return true;                                                            \
+  }                                                                         \
+                                                                            \
+ private:                                                                   \
+  CPPGC_NO_UNIQUE_ADDRESS internal::PrefinalizerRegistration<Class>         \
+      prefinalizer_dummy_{this};                                            \
+  friend class internal::__thisIsHereToForceASemicolonAfterThisMacro
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_PREFINALIZER_H_