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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 #include <iosfwd> | |
10 | |
11 #include "src/base/macros.h" | |
12 | |
13 namespace v8 { | |
14 namespace internal { | |
15 | |
16 // Forward declarations. | |
17 template <typename T> class Handle; | |
18 class Object; | |
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(JSReceiver, 0x221) /* 0000 0010 0010 0001 */ \ | |
34 V(JSObject, 0x621) /* 0000 0110 0010 0001 */ \ | |
35 V(JSArray, 0xe21) /* 0000 1110 0010 0001 */ \ | |
36 V(None, 0xfff) /* 0000 1111 1111 1111 */ | |
37 | |
38 class HType final { | |
39 public: | |
40 #define DECLARE_CONSTRUCTOR(Name, mask) \ | |
41 static HType Name() WARN_UNUSED_RESULT { return HType(k##Name); } | |
42 HTYPE_LIST(DECLARE_CONSTRUCTOR) | |
43 #undef DECLARE_CONSTRUCTOR | |
44 | |
45 // Return the weakest (least precise) common type. | |
46 HType Combine(HType other) const WARN_UNUSED_RESULT { | |
47 return HType(static_cast<Kind>(kind_ & other.kind_)); | |
48 } | |
49 | |
50 bool Equals(HType other) const WARN_UNUSED_RESULT { | |
51 return kind_ == other.kind_; | |
52 } | |
53 | |
54 bool IsSubtypeOf(HType other) const WARN_UNUSED_RESULT { | |
55 return Combine(other).Equals(other); | |
56 } | |
57 | |
58 #define DECLARE_IS_TYPE(Name, mask) \ | |
59 bool Is##Name() const WARN_UNUSED_RESULT { \ | |
60 return IsSubtypeOf(HType::Name()); \ | |
61 } | |
62 HTYPE_LIST(DECLARE_IS_TYPE) | |
63 #undef DECLARE_IS_TYPE | |
64 | |
65 template <class T> | |
66 static HType FromType(typename T::TypeHandle type) WARN_UNUSED_RESULT; | |
67 static HType FromValue(Handle<Object> value) WARN_UNUSED_RESULT; | |
68 | |
69 friend std::ostream& operator<<(std::ostream& os, const HType& t); | |
70 | |
71 private: | |
72 enum Kind { | |
73 #define DECLARE_TYPE(Name, mask) k##Name = mask, | |
74 HTYPE_LIST(DECLARE_TYPE) | |
75 #undef DECLARE_TYPE | |
76 LAST_KIND = kNone | |
77 }; | |
78 | |
79 // Make sure type fits in int16. | |
80 STATIC_ASSERT(LAST_KIND < (1 << (CHAR_BIT * sizeof(int16_t)))); | |
81 | |
82 explicit HType(Kind kind) : kind_(kind) { } | |
83 | |
84 int16_t kind_; | |
85 }; | |
86 | |
87 | |
88 std::ostream& operator<<(std::ostream& os, const HType& t); | |
89 } // namespace internal | |
90 } // namespace v8 | |
91 | |
92 #endif // HYDROGEN_TYPES_H_ | |
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