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// 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_