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
3 // found in the LICENSE file.
5 #ifndef V8_ELEMENTS_KIND_H_
6 #define V8_ELEMENTS_KIND_H_
8 #include "src/checks.h"
14 // 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.
17 FAST_HOLEY_SMI_ELEMENTS,
19 // The "fast" kind for tagged values. Must be second to make it possible to
20 // efficiently check maps for this and the FAST_SMI_ONLY_ELEMENTS kind
25 // The "fast" kind for unwrapped, non-tagged double values.
27 FAST_HOLEY_DOUBLE_ELEMENTS,
31 SLOPPY_ARGUMENTS_ELEMENTS,
32 // The "fast" kind for external arrays
33 EXTERNAL_INT8_ELEMENTS,
34 EXTERNAL_UINT8_ELEMENTS,
35 EXTERNAL_INT16_ELEMENTS,
36 EXTERNAL_UINT16_ELEMENTS,
37 EXTERNAL_INT32_ELEMENTS,
38 EXTERNAL_INT32x4_ELEMENTS,
39 EXTERNAL_UINT32_ELEMENTS,
40 EXTERNAL_FLOAT32_ELEMENTS,
41 EXTERNAL_FLOAT32x4_ELEMENTS,
42 EXTERNAL_FLOAT64_ELEMENTS,
43 EXTERNAL_FLOAT64x2_ELEMENTS,
44 EXTERNAL_UINT8_CLAMPED_ELEMENTS,
58 UINT8_CLAMPED_ELEMENTS,
60 // Derived constants from ElementsKind
61 FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
62 LAST_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
63 FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
64 LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
65 FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_INT8_ELEMENTS,
66 LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_UINT8_CLAMPED_ELEMENTS,
67 FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_ELEMENTS,
68 LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
69 TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
72 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
73 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
74 FIRST_FAST_ELEMENTS_KIND + 1;
76 // The number to add to a packed elements kind to reach a holey elements kind
77 const int kFastElementsKindPackedToHoley =
78 FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS;
80 int ElementsKindToShiftSize(ElementsKind elements_kind);
81 int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind);
82 const char* ElementsKindToString(ElementsKind kind);
84 inline ElementsKind GetInitialFastElementsKind() { return FAST_SMI_ELEMENTS; }
86 ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_number);
87 int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind);
89 ElementsKind GetNextTransitionElementsKind(ElementsKind elements_kind);
91 inline bool IsDictionaryElementsKind(ElementsKind kind) {
92 return kind == DICTIONARY_ELEMENTS;
96 inline bool IsExternalArrayElementsKind(ElementsKind kind) {
97 return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
98 kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
102 inline bool IsTerminalElementsKind(ElementsKind kind) {
103 return kind == TERMINAL_FAST_ELEMENTS_KIND ||
104 IsExternalArrayElementsKind(kind);
108 inline bool IsFixedTypedArrayElementsKind(ElementsKind kind) {
109 return kind >= FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND &&
110 kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
114 inline bool IsFastElementsKind(ElementsKind kind) {
115 DCHECK(FIRST_FAST_ELEMENTS_KIND == 0);
116 return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
120 inline bool IsTransitionElementsKind(ElementsKind kind) {
121 return IsFastElementsKind(kind) || IsFixedTypedArrayElementsKind(kind);
125 inline bool IsFastDoubleElementsKind(ElementsKind kind) {
126 return kind == FAST_DOUBLE_ELEMENTS ||
127 kind == FAST_HOLEY_DOUBLE_ELEMENTS;
131 inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
132 return kind == EXTERNAL_FLOAT64_ELEMENTS ||
133 kind == EXTERNAL_FLOAT32_ELEMENTS;
137 inline bool IsExternalFloat32x4ElementsKind(ElementsKind kind) {
138 return kind == EXTERNAL_FLOAT32x4_ELEMENTS;
142 inline bool IsExternalFloat64x2ElementsKind(ElementsKind kind) {
143 return kind == EXTERNAL_FLOAT64x2_ELEMENTS;
147 inline bool IsExternalInt32x4ElementsKind(ElementsKind kind) {
148 return kind == EXTERNAL_INT32x4_ELEMENTS;
152 inline bool IsFixedFloatElementsKind(ElementsKind kind) {
153 return kind == FLOAT32_ELEMENTS || kind == FLOAT64_ELEMENTS;
157 inline bool IsFixedFloat32x4ElementsKind(ElementsKind kind) {
158 return kind == FLOAT32x4_ELEMENTS;
162 inline bool IsFixedFloat64x2ElementsKind(ElementsKind kind) {
163 return kind == FLOAT64x2_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 IsFloat64x2ElementsKind(ElementsKind kind) {
186 return IsExternalFloat64x2ElementsKind(kind) ||
187 IsFixedFloat64x2ElementsKind(kind);
191 inline bool IsInt32x4ElementsKind(ElementsKind kind) {
192 return IsExternalInt32x4ElementsKind(kind) ||
193 IsFixedInt32x4ElementsKind(kind);
197 inline bool IsSIMD128ElementsKind(ElementsKind kind) {
198 return IsFloat32x4ElementsKind(kind) || IsFloat64x2ElementsKind(kind) ||
199 IsInt32x4ElementsKind(kind);
203 inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
204 return kind == FAST_SMI_ELEMENTS ||
205 kind == FAST_HOLEY_SMI_ELEMENTS ||
206 kind == FAST_ELEMENTS ||
207 kind == FAST_HOLEY_ELEMENTS;
211 inline bool IsFastSmiElementsKind(ElementsKind kind) {
212 return kind == FAST_SMI_ELEMENTS ||
213 kind == FAST_HOLEY_SMI_ELEMENTS;
217 inline bool IsFastObjectElementsKind(ElementsKind kind) {
218 return kind == FAST_ELEMENTS ||
219 kind == FAST_HOLEY_ELEMENTS;
223 inline bool IsFastHoleyElementsKind(ElementsKind kind) {
224 return kind == FAST_HOLEY_SMI_ELEMENTS ||
225 kind == FAST_HOLEY_DOUBLE_ELEMENTS ||
226 kind == FAST_HOLEY_ELEMENTS;
230 inline bool IsHoleyElementsKind(ElementsKind kind) {
231 return IsFastHoleyElementsKind(kind) ||
232 kind == DICTIONARY_ELEMENTS;
236 inline bool IsFastPackedElementsKind(ElementsKind kind) {
237 return kind == FAST_SMI_ELEMENTS ||
238 kind == FAST_DOUBLE_ELEMENTS ||
239 kind == FAST_ELEMENTS;
243 inline ElementsKind GetPackedElementsKind(ElementsKind holey_kind) {
244 if (holey_kind == FAST_HOLEY_SMI_ELEMENTS) {
245 return FAST_SMI_ELEMENTS;
247 if (holey_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
248 return FAST_DOUBLE_ELEMENTS;
250 if (holey_kind == FAST_HOLEY_ELEMENTS) {
251 return FAST_ELEMENTS;
257 inline ElementsKind GetHoleyElementsKind(ElementsKind packed_kind) {
258 if (packed_kind == FAST_SMI_ELEMENTS) {
259 return FAST_HOLEY_SMI_ELEMENTS;
261 if (packed_kind == FAST_DOUBLE_ELEMENTS) {
262 return FAST_HOLEY_DOUBLE_ELEMENTS;
264 if (packed_kind == FAST_ELEMENTS) {
265 return FAST_HOLEY_ELEMENTS;
271 inline ElementsKind FastSmiToObjectElementsKind(ElementsKind from_kind) {
272 DCHECK(IsFastSmiElementsKind(from_kind));
273 return (from_kind == FAST_SMI_ELEMENTS)
275 : FAST_HOLEY_ELEMENTS;
279 inline bool IsSimpleMapChangeTransition(ElementsKind from_kind,
280 ElementsKind to_kind) {
281 return (GetHoleyElementsKind(from_kind) == to_kind) ||
282 (IsFastSmiElementsKind(from_kind) &&
283 IsFastObjectElementsKind(to_kind));
287 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
288 ElementsKind to_kind);
291 inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
292 return IsFastElementsKind(from_kind) &&
293 from_kind != TERMINAL_FAST_ELEMENTS_KIND;
297 ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
298 bool allow_only_packed);
301 inline bool CanTransitionToMoreGeneralFastElementsKind(
302 ElementsKind elements_kind,
303 bool allow_only_packed) {
304 return IsFastElementsKind(elements_kind) &&
305 (elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
306 (!allow_only_packed || elements_kind != FAST_ELEMENTS));
310 } } // namespace v8::internal
312 #endif // V8_ELEMENTS_KIND_H_