1 // Copyright 2014 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 HYDROGEN_TYPES_H_ 6 #define HYDROGEN_TYPES_H_ 7 8 #include <climits> 9 10 #include "src/base/macros.h" 11 12 namespace v8 { 13 namespace internal { 14 15 // Forward declarations. 16 template <typename T> class Handle; 17 class Object; 18 class OStream; 19 20 #define HTYPE_LIST(V) \ 21 V(Any, 0x0) /* 0000 0000 0000 0000 */ \ 22 V(Tagged, 0x1) /* 0000 0000 0000 0001 */ \ 23 V(TaggedPrimitive, 0x5) /* 0000 0000 0000 0101 */ \ 24 V(TaggedNumber, 0xd) /* 0000 0000 0000 1101 */ \ 25 V(Smi, 0x1d) /* 0000 0000 0001 1101 */ \ 26 V(HeapObject, 0x21) /* 0000 0000 0010 0001 */ \ 27 V(HeapPrimitive, 0x25) /* 0000 0000 0010 0101 */ \ 28 V(Null, 0x27) /* 0000 0000 0010 0111 */ \ 29 V(HeapNumber, 0x2d) /* 0000 0000 0010 1101 */ \ 30 V(String, 0x65) /* 0000 0000 0110 0101 */ \ 31 V(Boolean, 0xa5) /* 0000 0000 1010 0101 */ \ 32 V(Undefined, 0x125) /* 0000 0001 0010 0101 */ \ 33 V(JSObject, 0x221) /* 0000 0010 0010 0001 */ \ 34 V(JSArray, 0x621) /* 0000 0110 0010 0001 */ \ 35 V(None, 0x7ff) /* 0000 0111 1111 1111 */ 36 37 class HType FINAL { 38 public: 39 #define DECLARE_CONSTRUCTOR(Name, mask) \ 40 static HType Name() WARN_UNUSED_RESULT { return HType(k##Name); } 41 HTYPE_LIST(DECLARE_CONSTRUCTOR) 42 #undef DECLARE_CONSTRUCTOR 43 44 // Return the weakest (least precise) common type. 45 HType Combine(HType other) const WARN_UNUSED_RESULT { 46 return HType(static_cast<Kind>(kind_ & other.kind_)); 47 } 48 49 bool Equals(HType other) const WARN_UNUSED_RESULT { 50 return kind_ == other.kind_; 51 } 52 53 bool IsSubtypeOf(HType other) const WARN_UNUSED_RESULT { 54 return Combine(other).Equals(other); 55 } 56 57 #define DECLARE_IS_TYPE(Name, mask) \ 58 bool Is##Name() const WARN_UNUSED_RESULT { \ 59 return IsSubtypeOf(HType::Name()); \ 60 } 61 HTYPE_LIST(DECLARE_IS_TYPE) 62 #undef DECLARE_IS_TYPE 63 64 template <class T> 65 static HType FromType(typename T::TypeHandle type) WARN_UNUSED_RESULT; 66 static HType FromValue(Handle<Object> value) WARN_UNUSED_RESULT; 67 68 friend OStream& operator<<(OStream& os, const HType& t); 69 70 private: 71 enum Kind { 72 #define DECLARE_TYPE(Name, mask) k##Name = mask, 73 HTYPE_LIST(DECLARE_TYPE) 74 #undef DECLARE_TYPE 75 LAST_KIND = kNone 76 }; 77 78 // Make sure type fits in int16. 79 STATIC_ASSERT(LAST_KIND < (1 << (CHAR_BIT * sizeof(int16_t)))); 80 81 explicit HType(Kind kind) : kind_(kind) { } 82 83 int16_t kind_; 84 }; 85 86 87 OStream& operator<<(OStream& os, const HType& t); 88 } } // namespace v8::internal 89 90 #endif // HYDROGEN_TYPES_H_ 91
