// 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_ODDBALL_H_ #define V8_OBJECTS_ODDBALL_H_ #include "src/objects/primitive-heap-object.h" // Has to be the last include (doesn't have include guards): #include "src/objects/object-macros.h" namespace v8 { namespace internal { // The Oddball describes objects null, undefined, true, and false. class Oddball : public TorqueGeneratedOddball<Oddball, PrimitiveHeapObject> { public: // [to_number_raw]: Cached raw to_number computed at startup. inline void set_to_number_raw_as_bits(uint64_t bits); inline byte kind() const; inline void set_kind(byte kind); // Oddball has a custom verifier. void OddballVerify(Isolate* isolate); // ES6 section 7.1.3 ToNumber for Boolean, Null, Undefined. V8_WARN_UNUSED_RESULT static inline Handle<Object> ToNumber( Isolate* isolate, Handle<Oddball> input); // Initialize the fields. static void Initialize(Isolate* isolate, Handle<Oddball> oddball, const char* to_string, Handle<Object> to_number, const char* type_of, byte kind); static const byte kFalse = 0; static const byte kTrue = 1; static const byte kNotBooleanMask = static_cast<byte>(~1); static const byte kTheHole = 2; static const byte kNull = 3; static const byte kArgumentsMarker = 4; static const byte kUndefined = 5; static const byte kUninitialized = 6; static const byte kOther = 7; static const byte kException = 8; static const byte kOptimizedOut = 9; static const byte kStaleRegister = 10; static const byte kSelfReferenceMarker = 10; static const byte kBasicBlockCountersMarker = 11; static_assert(kStartOfWeakFieldsOffset == kEndOfWeakFieldsOffset, "Ensure BodyDescriptor does not need to handle weak fields."); using BodyDescriptor = FixedBodyDescriptor<kStartOfStrongFieldsOffset, kEndOfStrongFieldsOffset, kSize>; STATIC_ASSERT(kKindOffset == Internals::kOddballKindOffset); STATIC_ASSERT(kNull == Internals::kNullOddballKind); STATIC_ASSERT(kUndefined == Internals::kUndefinedOddballKind); DECL_PRINTER(Oddball) TQ_OBJECT_CONSTRUCTORS(Oddball) }; } // namespace internal } // namespace v8 #include "src/objects/object-macros-undef.h" #endif // V8_OBJECTS_ODDBALL_H_