1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
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7 // notice, this list of conditions and the following disclaimer.
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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_INT8_ELEMENTS,
57 EXTERNAL_UINT8_ELEMENTS,
58 EXTERNAL_INT16_ELEMENTS,
59 EXTERNAL_UINT16_ELEMENTS,
60 EXTERNAL_INT32_ELEMENTS,
61 EXTERNAL_INT32x4_ELEMENTS,
62 EXTERNAL_UINT32_ELEMENTS,
63 EXTERNAL_FLOAT32_ELEMENTS,
64 EXTERNAL_FLOAT32x4_ELEMENTS,
65 EXTERNAL_FLOAT64_ELEMENTS,
66 EXTERNAL_UINT8_CLAMPED_ELEMENTS,
79 UINT8_CLAMPED_ELEMENTS,
81 // Derived constants from ElementsKind
82 FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
83 LAST_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
84 FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
85 LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
86 FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_INT8_ELEMENTS,
87 LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_UINT8_CLAMPED_ELEMENTS,
88 FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_ELEMENTS,
89 LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
90 TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
93 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
94 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
95 FIRST_FAST_ELEMENTS_KIND + 1;
97 // The number to add to a packed elements kind to reach a holey elements kind
98 const int kFastElementsKindPackedToHoley =
99 FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS;
101 int ElementsKindToShiftSize(ElementsKind elements_kind);
102 const char* ElementsKindToString(ElementsKind kind);
103 void PrintElementsKind(FILE* out, ElementsKind kind);
105 ElementsKind GetInitialFastElementsKind();
107 ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_index);
109 int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind);
112 inline bool IsDictionaryElementsKind(ElementsKind kind) {
113 return kind == DICTIONARY_ELEMENTS;
117 inline bool IsExternalArrayElementsKind(ElementsKind kind) {
118 return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
119 kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
123 inline bool IsFixedTypedArrayElementsKind(ElementsKind kind) {
124 return kind >= FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND &&
125 kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
129 inline bool IsFastElementsKind(ElementsKind kind) {
130 ASSERT(FIRST_FAST_ELEMENTS_KIND == 0);
131 return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
135 inline bool IsFastDoubleElementsKind(ElementsKind kind) {
136 return kind == FAST_DOUBLE_ELEMENTS ||
137 kind == FAST_HOLEY_DOUBLE_ELEMENTS;
141 inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
142 return kind == EXTERNAL_FLOAT64_ELEMENTS ||
143 kind == EXTERNAL_FLOAT32_ELEMENTS;
147 inline bool IsExternalFloat32x4ElementsKind(ElementsKind kind) {
148 return kind == EXTERNAL_FLOAT32x4_ELEMENTS;
152 inline bool IsExternalInt32x4ElementsKind(ElementsKind kind) {
153 return kind == EXTERNAL_INT32x4_ELEMENTS;
157 inline bool IsFixedFloatElementsKind(ElementsKind kind) {
158 return kind == FLOAT32_ELEMENTS || kind == FLOAT64_ELEMENTS;
162 inline bool IsFixedFloat32x4ElementsKind(ElementsKind kind) {
163 return kind == FLOAT32x4_ELEMENTS;
167 inline bool IsFixedInt32x4ElementsKind(ElementsKind kind) {
168 return kind == INT32x4_ELEMENTS;
172 inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
173 return IsFastDoubleElementsKind(kind) ||
174 IsExternalFloatOrDoubleElementsKind(kind) ||
175 IsFixedFloatElementsKind(kind);
179 inline bool IsFloat32x4ElementsKind(ElementsKind kind) {
180 return IsExternalFloat32x4ElementsKind(kind) ||
181 IsFixedFloat32x4ElementsKind(kind);
185 inline bool IsInt32x4ElementsKind(ElementsKind kind) {
186 return IsExternalInt32x4ElementsKind(kind) ||
187 IsFixedInt32x4ElementsKind(kind);
191 inline bool IsSIMD128ElementsKind(ElementsKind kind) {
192 return IsFloat32x4ElementsKind(kind) || IsInt32x4ElementsKind(kind);
196 inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
197 return kind == FAST_SMI_ELEMENTS ||
198 kind == FAST_HOLEY_SMI_ELEMENTS ||
199 kind == FAST_ELEMENTS ||
200 kind == FAST_HOLEY_ELEMENTS;
204 inline bool IsFastSmiElementsKind(ElementsKind kind) {
205 return kind == FAST_SMI_ELEMENTS ||
206 kind == FAST_HOLEY_SMI_ELEMENTS;
210 inline bool IsFastObjectElementsKind(ElementsKind kind) {
211 return kind == FAST_ELEMENTS ||
212 kind == FAST_HOLEY_ELEMENTS;
216 inline bool IsFastHoleyElementsKind(ElementsKind kind) {
217 return kind == FAST_HOLEY_SMI_ELEMENTS ||
218 kind == FAST_HOLEY_DOUBLE_ELEMENTS ||
219 kind == FAST_HOLEY_ELEMENTS;
223 inline bool IsHoleyElementsKind(ElementsKind kind) {
224 return IsFastHoleyElementsKind(kind) ||
225 kind == DICTIONARY_ELEMENTS;
229 inline bool IsFastPackedElementsKind(ElementsKind kind) {
230 return kind == FAST_SMI_ELEMENTS ||
231 kind == FAST_DOUBLE_ELEMENTS ||
232 kind == FAST_ELEMENTS;
236 inline ElementsKind GetPackedElementsKind(ElementsKind holey_kind) {
237 if (holey_kind == FAST_HOLEY_SMI_ELEMENTS) {
238 return FAST_SMI_ELEMENTS;
240 if (holey_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
241 return FAST_DOUBLE_ELEMENTS;
243 if (holey_kind == FAST_HOLEY_ELEMENTS) {
244 return FAST_ELEMENTS;
250 inline ElementsKind GetHoleyElementsKind(ElementsKind packed_kind) {
251 if (packed_kind == FAST_SMI_ELEMENTS) {
252 return FAST_HOLEY_SMI_ELEMENTS;
254 if (packed_kind == FAST_DOUBLE_ELEMENTS) {
255 return FAST_HOLEY_DOUBLE_ELEMENTS;
257 if (packed_kind == FAST_ELEMENTS) {
258 return FAST_HOLEY_ELEMENTS;
264 inline ElementsKind FastSmiToObjectElementsKind(ElementsKind from_kind) {
265 ASSERT(IsFastSmiElementsKind(from_kind));
266 return (from_kind == FAST_SMI_ELEMENTS)
268 : FAST_HOLEY_ELEMENTS;
272 inline bool IsSimpleMapChangeTransition(ElementsKind from_kind,
273 ElementsKind to_kind) {
274 return (GetHoleyElementsKind(from_kind) == to_kind) ||
275 (IsFastSmiElementsKind(from_kind) &&
276 IsFastObjectElementsKind(to_kind));
280 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
281 ElementsKind to_kind);
284 inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
285 return IsFastElementsKind(from_kind) &&
286 from_kind != TERMINAL_FAST_ELEMENTS_KIND;
290 ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
291 bool allow_only_packed);
294 inline bool CanTransitionToMoreGeneralFastElementsKind(
295 ElementsKind elements_kind,
296 bool allow_only_packed) {
297 return IsFastElementsKind(elements_kind) &&
298 (elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
299 (!allow_only_packed || elements_kind != FAST_ELEMENTS));
303 } } // namespace v8::internal
305 #endif // V8_ELEMENTS_KIND_H_