explicit-management.h

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// Copyright 2021 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_EXPLICIT_MANAGEMENT_H_
#define INCLUDE_CPPGC_EXPLICIT_MANAGEMENT_H_
 
#include <cstddef>
 
#include "cppgc/allocation.h"
#include "cppgc/internal/logging.h"
#include "cppgc/type-traits.h"
 
namespace cppgc {
 
class HeapHandle;
 
namespace subtle {
 
template <typename T>
void FreeUnreferencedObject(HeapHandle& heap_handle, T& object);
template <typename T>
bool Resize(T& object, AdditionalBytes additional_bytes);
 
}  // namespace subtle
 
namespace internal {
 
class ExplicitManagementImpl final {
 private:
  V8_EXPORT static void FreeUnreferencedObject(HeapHandle&, void*);
  V8_EXPORT static bool Resize(void*, size_t);
 
  template <typename T>
  friend void subtle::FreeUnreferencedObject(HeapHandle&, T&);
  template <typename T>
  friend bool subtle::Resize(T&, AdditionalBytes);
};
}  // namespace internal
 
namespace subtle {
 
template <typename T>
void FreeUnreferencedObject(HeapHandle& heap_handle, T& object) {
  static_assert(IsGarbageCollectedTypeV<T>,
                "Object must be of type GarbageCollected.");
  internal::ExplicitManagementImpl::FreeUnreferencedObject(heap_handle,
                                                           &object);
}
 
template <typename T>
bool Resize(T& object, AdditionalBytes additional_bytes) {
  static_assert(IsGarbageCollectedTypeV<T>,
                "Object must be of type GarbageCollected.");
  return internal::ExplicitManagementImpl::Resize(
      &object, sizeof(T) + additional_bytes.value);
}
 
}  // namespace subtle
}  // namespace cppgc
 
#endif  // INCLUDE_CPPGC_EXPLICIT_MANAGEMENT_H_