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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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65 static TypeInfo Smi() { return TypeInfo(kSmi); } | 65 static TypeInfo Smi() { return TypeInfo(kSmi); } |
66 // We know it's a heap number. | 66 // We know it's a heap number. |
67 static TypeInfo Double() { return TypeInfo(kDouble); } | 67 static TypeInfo Double() { return TypeInfo(kDouble); } |
68 // We know it's a string. | 68 // We know it's a string. |
69 static TypeInfo String() { return TypeInfo(kString); } | 69 static TypeInfo String() { return TypeInfo(kString); } |
70 // We know it's a non-primitive (object) type. | 70 // We know it's a non-primitive (object) type. |
71 static TypeInfo NonPrimitive() { return TypeInfo(kNonPrimitive); } | 71 static TypeInfo NonPrimitive() { return TypeInfo(kNonPrimitive); } |
72 // We haven't started collecting info yet. | 72 // We haven't started collecting info yet. |
73 static TypeInfo Uninitialized() { return TypeInfo(kUninitialized); } | 73 static TypeInfo Uninitialized() { return TypeInfo(kUninitialized); } |
74 | 74 |
75 // Return compact representation. Very sensitive to enum values below! | |
76 // Compacting drops information about primitive types and strings types. | |
77 // We use the compact representation when we only care about number types. | |
78 int ThreeBitRepresentation() { | |
79 ASSERT(type_ != kUninitialized); | |
80 int answer = type_ & 0xf; | |
81 answer = answer > 6 ? answer - 2 : answer; | |
82 ASSERT(answer >= 0); | |
83 ASSERT(answer <= 7); | |
84 return answer; | |
85 } | |
86 | |
87 // Decode compact representation. Very sensitive to enum values below! | |
88 static TypeInfo ExpandedRepresentation(int three_bit_representation) { | |
89 Type t = static_cast<Type>(three_bit_representation > 4 ? | |
90 three_bit_representation + 2 : | |
91 three_bit_representation); | |
92 t = (t == kUnknown) ? t : static_cast<Type>(t | kPrimitive); | |
93 ASSERT(t == kUnknown || | |
94 t == kNumber || | |
95 t == kInteger32 || | |
96 t == kSmi || | |
97 t == kDouble); | |
98 return TypeInfo(t); | |
99 } | |
100 | |
101 int ToInt() { | 75 int ToInt() { |
102 return type_; | 76 return type_; |
103 } | 77 } |
104 | 78 |
105 static TypeInfo FromInt(int bit_representation) { | 79 static TypeInfo FromInt(int bit_representation) { |
106 Type t = static_cast<Type>(bit_representation); | 80 Type t = static_cast<Type>(bit_representation); |
107 ASSERT(t == kUnknown || | 81 ASSERT(t == kUnknown || |
108 t == kPrimitive || | 82 t == kPrimitive || |
109 t == kNumber || | 83 t == kNumber || |
110 t == kInteger32 || | 84 t == kInteger32 || |
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287 | 261 |
288 Handle<Context> global_context_; | 262 Handle<Context> global_context_; |
289 Handle<NumberDictionary> dictionary_; | 263 Handle<NumberDictionary> dictionary_; |
290 | 264 |
291 DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle); | 265 DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle); |
292 }; | 266 }; |
293 | 267 |
294 } } // namespace v8::internal | 268 } } // namespace v8::internal |
295 | 269 |
296 #endif // V8_TYPE_INFO_H_ | 270 #endif // V8_TYPE_INFO_H_ |
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