1 // Copyright 2018 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_OBJECTS_ODDBALL_H_ 6 #define V8_OBJECTS_ODDBALL_H_ 7 8 #include "src/objects/primitive-heap-object.h" 9 10 // Has to be the last include (doesn't have include guards): 11 #include "src/objects/object-macros.h" 12 13 namespace v8 { 14 namespace internal { 15 16 #include "torque-generated/src/objects/oddball-tq.inc" 17 18 // The Oddball describes objects null, undefined, true, and false. 19 class Oddball : public PrimitiveHeapObject { 20 public: 21 // [to_number_raw]: Cached raw to_number computed at startup. 22 DECL_PRIMITIVE_ACCESSORS(to_number_raw, double) 23 inline void set_to_number_raw_as_bits(uint64_t bits); 24 25 // [to_string]: Cached to_string computed at startup. 26 DECL_ACCESSORS(to_string, String) 27 28 // [to_number]: Cached to_number computed at startup. 29 DECL_ACCESSORS(to_number, Object) 30 31 // [typeof]: Cached type_of computed at startup. 32 DECL_ACCESSORS(type_of, String) 33 34 inline byte kind() const; 35 inline void set_kind(byte kind); 36 37 // ES6 section 7.1.3 ToNumber for Boolean, Null, Undefined. 38 V8_WARN_UNUSED_RESULT static inline Handle<Object> ToNumber( 39 Isolate* isolate, Handle<Oddball> input); 40 41 V8_INLINE bool ToBool(Isolate* isolate) const; 42 43 DECL_CAST(Oddball) 44 45 // Dispatched behavior. 46 DECL_VERIFIER(Oddball) 47 48 // Initialize the fields. 49 static void Initialize(Isolate* isolate, Handle<Oddball> oddball, 50 const char* to_string, Handle<Object> to_number, 51 const char* type_of, byte kind); 52 53 // Layout description. 54 DECL_FIELD_OFFSET_TQ(ToNumberRaw, HeapObject::kHeaderSize, "float64") 55 DECL_FIELD_OFFSET_TQ(ToString, kToNumberRawOffset + kDoubleSize, "String") 56 DECL_FIELD_OFFSET_TQ(ToNumber, kToStringOffset + kTaggedSize, "Number") 57 DECL_FIELD_OFFSET_TQ(TypeOf, kToNumberOffset + kTaggedSize, "String") 58 DECL_FIELD_OFFSET_TQ(Kind, kTypeOfOffset + kTaggedSize, "Smi") 59 static const int kSize = kKindOffset + kTaggedSize; 60 61 static const byte kFalse = 0; 62 static const byte kTrue = 1; 63 static const byte kNotBooleanMask = static_cast<byte>(~1); 64 static const byte kTheHole = 2; 65 static const byte kNull = 3; 66 static const byte kArgumentsMarker = 4; 67 static const byte kUndefined = 5; 68 static const byte kUninitialized = 6; 69 static const byte kOther = 7; 70 static const byte kException = 8; 71 static const byte kOptimizedOut = 9; 72 static const byte kStaleRegister = 10; 73 static const byte kSelfReferenceMarker = 10; 74 static const byte kBasicBlockCountersMarker = 11; 75 76 using BodyDescriptor = 77 FixedBodyDescriptor<kToStringOffset, kKindOffset, kSize>; 78 79 STATIC_ASSERT(kKindOffset == Internals::kOddballKindOffset); 80 STATIC_ASSERT(kNull == Internals::kNullOddballKind); 81 STATIC_ASSERT(kUndefined == Internals::kUndefinedOddballKind); 82 83 DECL_PRINTER(Oddball) 84 85 OBJECT_CONSTRUCTORS(Oddball, PrimitiveHeapObject); 86 }; 87 88 } // namespace internal 89 } // namespace v8 90 91 #include "src/objects/object-macros-undef.h" 92 93 #endif // V8_OBJECTS_ODDBALL_H_ 94