prefinalizer.h

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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/compiler-specific.h"
#include "cppgc/liveness-broker.h"
 
namespace cppgc {
 
namespace internal {
 
class V8_EXPORT PrefinalizerRegistration final {
 public:
  using Callback = bool (*)(const cppgc::LivenessBroker&, void*);
 
  PrefinalizerRegistration(void*, Callback);
 
  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 cppgc::LivenessBroker& liveness_broker, \
                                 void* object) {                               \
    static_assert(cppgc::IsGarbageCollectedOrMixinTypeV<Class>,                \
                  "Only garbage collected objects can have prefinalizers");    \
    Class* self = static_cast<Class*>(object);                                 \
    if (liveness_broker.IsHeapObjectAlive(self)) return false;                 \
    self->PreFinalizer();                                                      \
    return true;                                                               \
  }                                                                            \
                                                                               \
 private:                                                                      \
  CPPGC_NO_UNIQUE_ADDRESS cppgc::internal::PrefinalizerRegistration            \
      prefinalizer_dummy_{this, Class::InvokePreFinalizer};                    \
  static_assert(true, "Force semicolon.")
 
}  // namespace cppgc
 
#endif  // INCLUDE_CPPGC_PREFINALIZER_H_