1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_ELEMENTS_KIND_H_
#define V8_ELEMENTS_KIND_H_
#include "src/base/macros.h"
#include "src/checks.h"
namespace v8 {
namespace internal {
enum ElementsKind {
// The "fast" kind for elements that only contain SMI values. Must be first
// to make it possible to efficiently check maps for this kind.
FAST_SMI_ELEMENTS,
FAST_HOLEY_SMI_ELEMENTS,
// The "fast" kind for tagged values. Must be second to make it possible to
// efficiently check maps for this and the FAST_SMI_ONLY_ELEMENTS kind
// together at once.
FAST_ELEMENTS,
FAST_HOLEY_ELEMENTS,
// The "fast" kind for unwrapped, non-tagged double values.
FAST_DOUBLE_ELEMENTS,
FAST_HOLEY_DOUBLE_ELEMENTS,
// The "slow" kind.
DICTIONARY_ELEMENTS,
FAST_SLOPPY_ARGUMENTS_ELEMENTS,
SLOW_SLOPPY_ARGUMENTS_ELEMENTS,
// Fixed typed arrays
UINT8_ELEMENTS,
INT8_ELEMENTS,
UINT16_ELEMENTS,
INT16_ELEMENTS,
UINT32_ELEMENTS,
INT32_ELEMENTS,
FLOAT32_ELEMENTS,
FLOAT64_ELEMENTS,
UINT8_CLAMPED_ELEMENTS,
// Derived constants from ElementsKind
FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
LAST_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_ELEMENTS,
LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
};
const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
FIRST_FAST_ELEMENTS_KIND + 1;
// The number to add to a packed elements kind to reach a holey elements kind
const int kFastElementsKindPackedToHoley =
FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS;
int ElementsKindToShiftSize(ElementsKind elements_kind);
int GetDefaultHeaderSizeForElementsKind(ElementsKind elements_kind);
const char* ElementsKindToString(ElementsKind kind);
inline ElementsKind GetInitialFastElementsKind() { return FAST_SMI_ELEMENTS; }
ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_number);
int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind);
ElementsKind GetNextTransitionElementsKind(ElementsKind elements_kind);
inline bool IsDictionaryElementsKind(ElementsKind kind) {
return kind == DICTIONARY_ELEMENTS;
}
inline bool IsSloppyArgumentsElements(ElementsKind kind) {
return kind == FAST_SLOPPY_ARGUMENTS_ELEMENTS ||
kind == SLOW_SLOPPY_ARGUMENTS_ELEMENTS;
}
inline bool IsFixedTypedArrayElementsKind(ElementsKind kind) {
return kind >= FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND &&
kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
}
inline bool IsTerminalElementsKind(ElementsKind kind) {
return kind == TERMINAL_FAST_ELEMENTS_KIND ||
IsFixedTypedArrayElementsKind(kind);
}
inline bool IsFastElementsKind(ElementsKind kind) {
STATIC_ASSERT(FIRST_FAST_ELEMENTS_KIND == 0);
return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
}
inline bool IsTransitionElementsKind(ElementsKind kind) {
return IsFastElementsKind(kind) || IsFixedTypedArrayElementsKind(kind) ||
kind == FAST_SLOPPY_ARGUMENTS_ELEMENTS;
}
inline bool IsFastDoubleElementsKind(ElementsKind kind) {
return kind == FAST_DOUBLE_ELEMENTS ||
kind == FAST_HOLEY_DOUBLE_ELEMENTS;
}
inline bool IsFixedFloatElementsKind(ElementsKind kind) {
return kind == FLOAT32_ELEMENTS || kind == FLOAT64_ELEMENTS;
}
inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
return IsFastDoubleElementsKind(kind) || IsFixedFloatElementsKind(kind);
}
inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS ||
kind == FAST_HOLEY_SMI_ELEMENTS ||
kind == FAST_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsFastSmiElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS ||
kind == FAST_HOLEY_SMI_ELEMENTS;
}
inline bool IsFastObjectElementsKind(ElementsKind kind) {
return kind == FAST_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsFastHoleyElementsKind(ElementsKind kind) {
return kind == FAST_HOLEY_SMI_ELEMENTS ||
kind == FAST_HOLEY_DOUBLE_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsHoleyElementsKind(ElementsKind kind) {
return IsFastHoleyElementsKind(kind) ||
kind == DICTIONARY_ELEMENTS;
}
inline bool IsFastPackedElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS || kind == FAST_DOUBLE_ELEMENTS ||
kind == FAST_ELEMENTS;
}
inline ElementsKind GetPackedElementsKind(ElementsKind holey_kind) {
if (holey_kind == FAST_HOLEY_SMI_ELEMENTS) {
return FAST_SMI_ELEMENTS;
}
if (holey_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
return FAST_DOUBLE_ELEMENTS;
}
if (holey_kind == FAST_HOLEY_ELEMENTS) {
return FAST_ELEMENTS;
}
return holey_kind;
}
inline ElementsKind GetHoleyElementsKind(ElementsKind packed_kind) {
if (packed_kind == FAST_SMI_ELEMENTS) {
return FAST_HOLEY_SMI_ELEMENTS;
}
if (packed_kind == FAST_DOUBLE_ELEMENTS) {
return FAST_HOLEY_DOUBLE_ELEMENTS;
}
if (packed_kind == FAST_ELEMENTS) {
return FAST_HOLEY_ELEMENTS;
}
return packed_kind;
}
inline ElementsKind FastSmiToObjectElementsKind(ElementsKind from_kind) {
DCHECK(IsFastSmiElementsKind(from_kind));
return (from_kind == FAST_SMI_ELEMENTS)
? FAST_ELEMENTS
: FAST_HOLEY_ELEMENTS;
}
inline bool IsSimpleMapChangeTransition(ElementsKind from_kind,
ElementsKind to_kind) {
return (GetHoleyElementsKind(from_kind) == to_kind) ||
(IsFastSmiElementsKind(from_kind) &&
IsFastObjectElementsKind(to_kind));
}
bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
ElementsKind to_kind);
inline ElementsKind GetMoreGeneralElementsKind(ElementsKind from_kind,
ElementsKind to_kind) {
if (IsMoreGeneralElementsKindTransition(from_kind, to_kind)) {
return to_kind;
}
return from_kind;
}
inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
return IsFastElementsKind(from_kind) &&
from_kind != TERMINAL_FAST_ELEMENTS_KIND;
}
} } // namespace v8::internal
#endif // V8_ELEMENTS_KIND_H_
|
