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28 #ifndef V8_ELEMENTS_KIND_H_
29 #define V8_ELEMENTS_KIND_H_
37 // The "fast" kind for elements that only contain SMI values. Must be first
38 // to make it possible to efficiently check maps for this kind.
40 FAST_HOLEY_SMI_ELEMENTS,
42 // The "fast" kind for tagged values. Must be second to make it possible to
43 // efficiently check maps for this and the FAST_SMI_ONLY_ELEMENTS kind
48 // The "fast" kind for unwrapped, non-tagged double values.
50 FAST_HOLEY_DOUBLE_ELEMENTS,
54 NON_STRICT_ARGUMENTS_ELEMENTS,
55 // The "fast" kind for external arrays
56 EXTERNAL_BYTE_ELEMENTS,
57 EXTERNAL_UNSIGNED_BYTE_ELEMENTS,
58 EXTERNAL_SHORT_ELEMENTS,
59 EXTERNAL_UNSIGNED_SHORT_ELEMENTS,
60 EXTERNAL_INT_ELEMENTS,
61 EXTERNAL_UNSIGNED_INT_ELEMENTS,
62 EXTERNAL_FLOAT_ELEMENTS,
63 EXTERNAL_DOUBLE_ELEMENTS,
64 EXTERNAL_PIXEL_ELEMENTS,
66 // Derived constants from ElementsKind
67 FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
68 LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
69 FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
70 LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
71 FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_BYTE_ELEMENTS,
72 LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
73 TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
76 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
77 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
78 FIRST_FAST_ELEMENTS_KIND + 1;
80 const char* ElementsKindToString(ElementsKind kind);
81 void PrintElementsKind(FILE* out, ElementsKind kind);
83 ElementsKind GetInitialFastElementsKind();
85 ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_index);
87 int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind);
90 inline bool IsDictionaryElementsKind(ElementsKind kind) {
91 return kind == DICTIONARY_ELEMENTS;
95 inline bool IsExternalArrayElementsKind(ElementsKind kind) {
96 return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
97 kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
101 inline bool IsFastElementsKind(ElementsKind kind) {
102 ASSERT(FIRST_FAST_ELEMENTS_KIND == 0);
103 return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
107 inline bool IsFastDoubleElementsKind(ElementsKind kind) {
108 return kind == FAST_DOUBLE_ELEMENTS ||
109 kind == FAST_HOLEY_DOUBLE_ELEMENTS;
113 inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
114 return kind == EXTERNAL_DOUBLE_ELEMENTS ||
115 kind == EXTERNAL_FLOAT_ELEMENTS;
119 inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
120 return IsFastDoubleElementsKind(kind) ||
121 IsExternalFloatOrDoubleElementsKind(kind);
125 inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
126 return kind == FAST_SMI_ELEMENTS ||
127 kind == FAST_HOLEY_SMI_ELEMENTS ||
128 kind == FAST_ELEMENTS ||
129 kind == FAST_HOLEY_ELEMENTS;
133 inline bool IsFastSmiElementsKind(ElementsKind kind) {
134 return kind == FAST_SMI_ELEMENTS ||
135 kind == FAST_HOLEY_SMI_ELEMENTS;
139 inline bool IsFastObjectElementsKind(ElementsKind kind) {
140 return kind == FAST_ELEMENTS ||
141 kind == FAST_HOLEY_ELEMENTS;
145 inline bool IsFastHoleyElementsKind(ElementsKind kind) {
146 return kind == FAST_HOLEY_SMI_ELEMENTS ||
147 kind == FAST_HOLEY_DOUBLE_ELEMENTS ||
148 kind == FAST_HOLEY_ELEMENTS;
152 inline bool IsHoleyElementsKind(ElementsKind kind) {
153 return IsFastHoleyElementsKind(kind) ||
154 kind == DICTIONARY_ELEMENTS;
158 inline bool IsFastPackedElementsKind(ElementsKind kind) {
159 return kind == FAST_SMI_ELEMENTS ||
160 kind == FAST_DOUBLE_ELEMENTS ||
161 kind == FAST_ELEMENTS;
165 inline ElementsKind GetPackedElementsKind(ElementsKind holey_kind) {
166 if (holey_kind == FAST_HOLEY_SMI_ELEMENTS) {
167 return FAST_SMI_ELEMENTS;
169 if (holey_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
170 return FAST_DOUBLE_ELEMENTS;
172 if (holey_kind == FAST_HOLEY_ELEMENTS) {
173 return FAST_ELEMENTS;
179 inline ElementsKind GetHoleyElementsKind(ElementsKind packed_kind) {
180 if (packed_kind == FAST_SMI_ELEMENTS) {
181 return FAST_HOLEY_SMI_ELEMENTS;
183 if (packed_kind == FAST_DOUBLE_ELEMENTS) {
184 return FAST_HOLEY_DOUBLE_ELEMENTS;
186 if (packed_kind == FAST_ELEMENTS) {
187 return FAST_HOLEY_ELEMENTS;
193 inline ElementsKind FastSmiToObjectElementsKind(ElementsKind from_kind) {
194 ASSERT(IsFastSmiElementsKind(from_kind));
195 return (from_kind == FAST_SMI_ELEMENTS)
197 : FAST_HOLEY_ELEMENTS;
201 inline bool IsSimpleMapChangeTransition(ElementsKind from_kind,
202 ElementsKind to_kind) {
203 return (GetHoleyElementsKind(from_kind) == to_kind) ||
204 (IsFastSmiElementsKind(from_kind) &&
205 IsFastObjectElementsKind(to_kind));
209 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
210 ElementsKind to_kind);
213 inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
214 return IsFastElementsKind(from_kind) &&
215 from_kind != TERMINAL_FAST_ELEMENTS_KIND;
219 ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
220 bool allow_only_packed);
223 inline bool CanTransitionToMoreGeneralFastElementsKind(
224 ElementsKind elements_kind,
225 bool allow_only_packed) {
226 return IsFastElementsKind(elements_kind) &&
227 (elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
228 (!allow_only_packed || elements_kind != FAST_ELEMENTS));
232 } } // namespace v8::internal
234 #endif // V8_ELEMENTS_KIND_H_