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1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 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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58 // we have to inspect their backing element in the frame. | 58 // we have to inspect their backing element in the frame. |
59 ASSERT(!is_copy()); | 59 ASSERT(!is_copy()); |
60 if (!is_constant()) return NumberInfoField::decode(value_); | 60 if (!is_constant()) return NumberInfoField::decode(value_); |
61 Handle<Object> value = handle(); | 61 Handle<Object> value = handle(); |
62 if (value->IsSmi()) return NumberInfo::kSmi; | 62 if (value->IsSmi()) return NumberInfo::kSmi; |
63 if (value->IsHeapNumber()) return NumberInfo::kHeapNumber; | 63 if (value->IsHeapNumber()) return NumberInfo::kHeapNumber; |
64 return NumberInfo::kUnknown; | 64 return NumberInfo::kUnknown; |
65 } | 65 } |
66 | 66 |
67 inline void set_number_info(NumberInfo::Type info) { | 67 inline void set_number_info(NumberInfo::Type info) { |
| 68 // Copied elements do not have number info. Instead |
| 69 // we have to inspect their backing element in the frame. |
| 70 ASSERT(!is_copy()); |
68 value_ = value_ & ~NumberInfoField::mask(); | 71 value_ = value_ & ~NumberInfoField::mask(); |
69 value_ = value_ | NumberInfoField::encode(info); | 72 value_ = value_ | NumberInfoField::encode(info); |
70 } | 73 } |
71 | 74 |
72 // The default constructor creates an invalid frame element. | 75 // The default constructor creates an invalid frame element. |
73 FrameElement() { | 76 FrameElement() { |
74 value_ = TypeField::encode(INVALID) | 77 value_ = TypeField::encode(INVALID) |
75 | CopiedField::encode(false) | 78 | CopiedField::encode(false) |
76 | SyncedField::encode(false) | 79 | SyncedField::encode(false) |
77 | NumberInfoField::encode(NumberInfo::kUninitialized) | 80 | NumberInfoField::encode(NumberInfo::kUninitialized) |
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251 class SyncedField: public BitField<bool, 4, 1> {}; | 254 class SyncedField: public BitField<bool, 4, 1> {}; |
252 class NumberInfoField: public BitField<NumberInfo::Type, 5, 3> {}; | 255 class NumberInfoField: public BitField<NumberInfo::Type, 5, 3> {}; |
253 class DataField: public BitField<uint32_t, 8, 32 - 8> {}; | 256 class DataField: public BitField<uint32_t, 8, 32 - 8> {}; |
254 | 257 |
255 friend class VirtualFrame; | 258 friend class VirtualFrame; |
256 }; | 259 }; |
257 | 260 |
258 } } // namespace v8::internal | 261 } } // namespace v8::internal |
259 | 262 |
260 #endif // V8_FRAME_ELEMENT_H_ | 263 #endif // V8_FRAME_ELEMENT_H_ |
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