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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef V8_ELEMENTS_KIND_H_ | 5 #ifndef V8_ELEMENTS_KIND_H_ |
| 6 #define V8_ELEMENTS_KIND_H_ | 6 #define V8_ELEMENTS_KIND_H_ |
| 7 | 7 |
| 8 #include "src/checks.h" | 8 #include "src/checks.h" |
| 9 #include "src/ostreams.h" |
| 9 | 10 |
| 10 namespace v8 { | 11 namespace v8 { |
| 11 namespace internal { | 12 namespace internal { |
| 12 | 13 |
| 13 enum ElementsKind { | 14 enum ElementsKind { |
| 14 // The "fast" kind for elements that only contain SMI values. Must be first | 15 // The "fast" kind for elements that only contain SMI values. Must be first |
| 15 // to make it possible to efficiently check maps for this kind. | 16 // to make it possible to efficiently check maps for this kind. |
| 16 FAST_SMI_ELEMENTS, | 17 FAST_SMI_ELEMENTS, |
| 17 FAST_HOLEY_SMI_ELEMENTS, | 18 FAST_HOLEY_SMI_ELEMENTS, |
| 18 | 19 |
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| 67 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND - | 68 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND - |
| 68 FIRST_FAST_ELEMENTS_KIND + 1; | 69 FIRST_FAST_ELEMENTS_KIND + 1; |
| 69 | 70 |
| 70 // The number to add to a packed elements kind to reach a holey elements kind | 71 // The number to add to a packed elements kind to reach a holey elements kind |
| 71 const int kFastElementsKindPackedToHoley = | 72 const int kFastElementsKindPackedToHoley = |
| 72 FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS; | 73 FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS; |
| 73 | 74 |
| 74 int ElementsKindToShiftSize(ElementsKind elements_kind); | 75 int ElementsKindToShiftSize(ElementsKind elements_kind); |
| 75 int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind); | 76 int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind); |
| 76 const char* ElementsKindToString(ElementsKind kind); | 77 const char* ElementsKindToString(ElementsKind kind); |
| 77 void PrintElementsKind(FILE* out, ElementsKind kind); | |
| 78 | 78 |
| 79 ElementsKind GetInitialFastElementsKind(); | 79 ElementsKind GetInitialFastElementsKind(); |
| 80 | 80 |
| 81 ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_number); | 81 ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_number); |
| 82 int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind); | 82 int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind); |
| 83 | 83 |
| 84 ElementsKind GetNextTransitionElementsKind(ElementsKind elements_kind); | 84 ElementsKind GetNextTransitionElementsKind(ElementsKind elements_kind); |
| 85 | 85 |
| 86 inline bool IsDictionaryElementsKind(ElementsKind kind) { | 86 inline bool IsDictionaryElementsKind(ElementsKind kind) { |
| 87 return kind == DICTIONARY_ELEMENTS; | 87 return kind == DICTIONARY_ELEMENTS; |
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| 244 bool allow_only_packed) { | 244 bool allow_only_packed) { |
| 245 return IsFastElementsKind(elements_kind) && | 245 return IsFastElementsKind(elements_kind) && |
| 246 (elements_kind != TERMINAL_FAST_ELEMENTS_KIND && | 246 (elements_kind != TERMINAL_FAST_ELEMENTS_KIND && |
| 247 (!allow_only_packed || elements_kind != FAST_ELEMENTS)); | 247 (!allow_only_packed || elements_kind != FAST_ELEMENTS)); |
| 248 } | 248 } |
| 249 | 249 |
| 250 | 250 |
| 251 } } // namespace v8::internal | 251 } } // namespace v8::internal |
| 252 | 252 |
| 253 #endif // V8_ELEMENTS_KIND_H_ | 253 #endif // V8_ELEMENTS_KIND_H_ |
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