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// Copyright 2023 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_HOLE_H_
#define V8_OBJECTS_HOLE_H_
#include "src/objects/heap-number.h"
#include "src/objects/heap-object.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
#include "torque-generated/src/objects/hole-tq.inc"
class Hole : public HeapObject {
public:
inline void set_raw_numeric_value(uint64_t bits);
inline uint8_t kind() const;
DECL_CAST(Hole)
DECL_VERIFIER(Hole)
static inline void Initialize(Isolate* isolate, Handle<Hole> hole,
Handle<HeapNumber> numeric_value);
// Currently, we allow optimized code to treat holes as HeapNumbers to avoid
// conditional branching. This works by making Hole::kRawNumericValueOffset
// the same as HeapNumber::kValueOffset and storing NaN at that offset in
// Holes. This way, a hole will look like a NaN HeapNumber to optimized code.
DECL_FIELD_OFFSET_TQ(RawNumericValue, HeapObject::kHeaderSize, "float64")
static constexpr int kSize = kRawNumericValueOffset + kDoubleSize;
static_assert(HeapNumber::kValueOffset == Hole::kRawNumericValueOffset);
using BodyDescriptor = FixedBodyDescriptor<kSize, kSize, kSize>;
DECL_PRINTER(Hole)
OBJECT_CONSTRUCTORS(Hole, HeapObject);
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_HOLE_H_
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