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// Copyright 2018 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 V8_OBJECTS_MAYBE_OBJECT_H_
#define V8_OBJECTS_MAYBE_OBJECT_H_
#include "src/objects/tagged-impl.h"
namespace v8 {
namespace internal {
// A MaybeObject is either a SMI, a strong reference to a HeapObject, a weak
// reference to a HeapObject, or a cleared weak reference. It's used for
// implementing in-place weak references (see design doc: goo.gl/j6SdcK )
class MaybeObject : public TaggedImpl<HeapObjectReferenceType::WEAK, Address> {
public:
constexpr MaybeObject() : TaggedImpl(kNullAddress) {}
constexpr explicit MaybeObject(Address ptr) : TaggedImpl(ptr) {}
// These operator->() overloads are required for handlified code.
constexpr const MaybeObject* operator->() const { return this; }
V8_INLINE static MaybeObject FromSmi(Smi smi);
V8_INLINE static MaybeObject FromObject(Object object);
V8_INLINE static MaybeObject MakeWeak(MaybeObject object);
V8_INLINE static MaybeObject Create(MaybeObject o);
V8_INLINE static MaybeObject Create(Object o);
V8_INLINE static MaybeObject Create(Smi smi);
#ifdef VERIFY_HEAP
static void VerifyMaybeObjectPointer(Isolate* isolate, MaybeObject p);
#endif
private:
template <typename TFieldType, int kFieldOffset>
friend class TaggedField;
};
// A HeapObjectReference is either a strong reference to a HeapObject, a weak
// reference to a HeapObject, or a cleared weak reference.
class HeapObjectReference : public MaybeObject {
public:
explicit HeapObjectReference(Address address) : MaybeObject(address) {}
V8_INLINE explicit HeapObjectReference(Object object);
V8_INLINE static HeapObjectReference Strong(Object object);
V8_INLINE static HeapObjectReference Weak(Object object);
V8_INLINE static HeapObjectReference From(Object object,
HeapObjectReferenceType type);
V8_INLINE static HeapObjectReference ClearedValue(PtrComprCageBase cage_base);
template <typename THeapObjectSlot>
V8_INLINE static void Update(THeapObjectSlot slot, HeapObject value);
};
} // namespace internal
} // namespace v8
#endif // V8_OBJECTS_MAYBE_OBJECT_H_
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