| // 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); |
| |
| 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 offsetof(HeapNumber, value_) 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; |
| |
| 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_ |