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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_