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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 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_LAYOUT_DESCRIPTOR_INL_H_ | 5 #ifndef V8_LAYOUT_DESCRIPTOR_INL_H_ |
6 #define V8_LAYOUT_DESCRIPTOR_INL_H_ | 6 #define V8_LAYOUT_DESCRIPTOR_INL_H_ |
7 | 7 |
8 #include "src/layout-descriptor.h" | 8 #include "src/layout-descriptor.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
11 namespace internal { | 11 namespace internal { |
12 | 12 |
13 LayoutDescriptor* LayoutDescriptor::FromSmi(Smi* smi) { | 13 LayoutDescriptor* LayoutDescriptor::FromSmi(Smi* smi) { |
14 return LayoutDescriptor::cast(smi); | 14 return LayoutDescriptor::cast(smi); |
15 } | 15 } |
16 | 16 |
17 | 17 |
18 Handle<LayoutDescriptor> LayoutDescriptor::New(Isolate* isolate, int length) { | 18 Handle<LayoutDescriptor> LayoutDescriptor::New(Isolate* isolate, int length) { |
19 if (length <= kSmiValueSize) { | 19 if (length <= kSmiValueSize) { |
20 // The whole bit vector fits into a smi. | 20 // The whole bit vector fits into a smi. |
21 return handle(LayoutDescriptor::FromSmi(Smi::FromInt(0)), isolate); | 21 return handle(LayoutDescriptor::FromSmi(Smi::FromInt(0)), isolate); |
22 } | 22 } |
23 length = GetSlowModeBackingStoreLength(length); | 23 length = GetSlowModeBackingStoreLength(length); |
24 return Handle<LayoutDescriptor>::cast( | 24 return Handle<LayoutDescriptor>::cast( |
25 isolate->factory()->NewJSTypedArray(UINT32_ELEMENTS, length)); | 25 isolate->factory()->NewFixedTypedArray(length, kExternalUint32Array)); |
26 } | 26 } |
27 | 27 |
28 | 28 |
29 bool LayoutDescriptor::InobjectUnboxedField(int inobject_properties, | 29 bool LayoutDescriptor::InobjectUnboxedField(int inobject_properties, |
30 PropertyDetails details) { | 30 PropertyDetails details) { |
31 if (details.type() != DATA || !details.representation().IsDouble()) { | 31 if (details.type() != DATA || !details.representation().IsDouble()) { |
32 return false; | 32 return false; |
33 } | 33 } |
34 // We care only about in-object properties. | 34 // We care only about in-object properties. |
35 return details.field_index() < inobject_properties; | 35 return details.field_index() < inobject_properties; |
36 } | 36 } |
37 | 37 |
38 | 38 |
39 LayoutDescriptor* LayoutDescriptor::FastPointerLayout() { | 39 LayoutDescriptor* LayoutDescriptor::FastPointerLayout() { |
40 return LayoutDescriptor::FromSmi(Smi::FromInt(0)); | 40 return LayoutDescriptor::FromSmi(Smi::FromInt(0)); |
41 } | 41 } |
42 | 42 |
43 | 43 |
44 bool LayoutDescriptor::GetIndexes(int field_index, int* layout_word_index, | 44 bool LayoutDescriptor::GetIndexes(int field_index, int* layout_word_index, |
45 int* layout_bit_index) { | 45 int* layout_bit_index) { |
46 if (static_cast<unsigned>(field_index) >= static_cast<unsigned>(capacity())) { | 46 if (static_cast<unsigned>(field_index) >= static_cast<unsigned>(capacity())) { |
47 return false; | 47 return false; |
48 } | 48 } |
49 | 49 |
50 *layout_word_index = field_index / kNumberOfBits; | 50 *layout_word_index = field_index / kNumberOfBits; |
51 CHECK((!IsSmi() && (*layout_word_index < Smi::cast(length())->value())) || | 51 CHECK((!IsSmi() && (*layout_word_index < length())) || |
52 (IsSmi() && (*layout_word_index < 1))); | 52 (IsSmi() && (*layout_word_index < 1))); |
53 | 53 |
54 *layout_bit_index = field_index % kNumberOfBits; | 54 *layout_bit_index = field_index % kNumberOfBits; |
55 return true; | 55 return true; |
56 } | 56 } |
57 | 57 |
58 | 58 |
59 LayoutDescriptor* LayoutDescriptor::SetTagged(int field_index, bool tagged) { | 59 LayoutDescriptor* LayoutDescriptor::SetTagged(int field_index, bool tagged) { |
60 int layout_word_index; | 60 int layout_word_index; |
61 int layout_bit_index; | 61 int layout_bit_index; |
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116 | 116 |
117 bool LayoutDescriptor::IsFastPointerLayout(Object* layout_descriptor) { | 117 bool LayoutDescriptor::IsFastPointerLayout(Object* layout_descriptor) { |
118 return layout_descriptor == FastPointerLayout(); | 118 return layout_descriptor == FastPointerLayout(); |
119 } | 119 } |
120 | 120 |
121 | 121 |
122 bool LayoutDescriptor::IsSlowLayout() { return !IsSmi(); } | 122 bool LayoutDescriptor::IsSlowLayout() { return !IsSmi(); } |
123 | 123 |
124 | 124 |
125 int LayoutDescriptor::capacity() { | 125 int LayoutDescriptor::capacity() { |
126 return IsSlowLayout() ? (Smi::cast(length())->value() * kNumberOfBits) | 126 return IsSlowLayout() ? (length() * kNumberOfBits) : kSmiValueSize; |
127 : kSmiValueSize; | |
128 } | 127 } |
129 | 128 |
130 | 129 |
131 uint32_t LayoutDescriptor::get_scalar(int index) { | |
132 DCHECK(IsSlowLayout()); | |
133 return GcSafeElements()->get_scalar(index); | |
134 } | |
135 | |
136 | |
137 void LayoutDescriptor::set(int index, uint32_t value) { | |
138 DCHECK(IsSlowLayout()); | |
139 GcSafeElements()->set(index, value); | |
140 } | |
141 | |
142 | |
143 LayoutDescriptor* LayoutDescriptor::cast_gc_safe(Object* object) { | 130 LayoutDescriptor* LayoutDescriptor::cast_gc_safe(Object* object) { |
144 if (object->IsSmi()) { | 131 if (object->IsSmi()) { |
145 // Fast mode layout descriptor. | 132 // Fast mode layout descriptor. |
146 return reinterpret_cast<LayoutDescriptor*>(object); | 133 return reinterpret_cast<LayoutDescriptor*>(object); |
147 } | 134 } |
148 | 135 |
149 // This is a mixed descriptor which is a fixed typed array. | 136 // This is a mixed descriptor which is a fixed typed array. |
150 MapWord map_word = reinterpret_cast<HeapObject*>(object)->map_word(); | 137 MapWord map_word = reinterpret_cast<HeapObject*>(object)->map_word(); |
151 if (map_word.IsForwardingAddress()) { | 138 if (map_word.IsForwardingAddress()) { |
152 // Mark-compact has already moved layout descriptor. | 139 // Mark-compact has already moved layout descriptor. |
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220 int field_index = details.field_index(); | 207 int field_index = details.field_index(); |
221 layout_descriptor = layout_descriptor->SetRawData(field_index); | 208 layout_descriptor = layout_descriptor->SetRawData(field_index); |
222 if (details.field_width_in_words() > 1) { | 209 if (details.field_width_in_words() > 1) { |
223 layout_descriptor = layout_descriptor->SetRawData(field_index + 1); | 210 layout_descriptor = layout_descriptor->SetRawData(field_index + 1); |
224 } | 211 } |
225 } | 212 } |
226 return layout_descriptor; | 213 return layout_descriptor; |
227 } | 214 } |
228 | 215 |
229 | 216 |
230 FixedTypedArray<Uint32ArrayTraits>* LayoutDescriptor::GcSafeElements() { | |
231 MapWord map_word = HeapObject::cast(elements())->map_word(); | |
232 if (map_word.IsForwardingAddress()) { | |
233 return FixedTypedArray<Uint32ArrayTraits>::cast( | |
234 map_word.ToForwardingAddress()); | |
235 } | |
236 return FixedTypedArray<Uint32ArrayTraits>::cast(elements()); | |
237 } | |
238 | |
239 | |
240 // InobjectPropertiesHelper is a helper class for querying whether inobject | 217 // InobjectPropertiesHelper is a helper class for querying whether inobject |
241 // property at offset is Double or not. | 218 // property at offset is Double or not. |
242 LayoutDescriptorHelper::LayoutDescriptorHelper(Map* map) | 219 LayoutDescriptorHelper::LayoutDescriptorHelper(Map* map) |
243 : all_fields_tagged_(true), | 220 : all_fields_tagged_(true), |
244 header_size_(0), | 221 header_size_(0), |
245 layout_descriptor_(LayoutDescriptor::FastPointerLayout()) { | 222 layout_descriptor_(LayoutDescriptor::FastPointerLayout()) { |
246 if (!FLAG_unbox_double_fields) return; | 223 if (!FLAG_unbox_double_fields) return; |
247 | 224 |
248 layout_descriptor_ = map->layout_descriptor_gc_safe(); | 225 layout_descriptor_ = map->layout_descriptor_gc_safe(); |
249 if (layout_descriptor_->IsFastPointerLayout()) { | 226 if (layout_descriptor_->IsFastPointerLayout()) { |
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265 // Object headers do not contain non-tagged fields. | 242 // Object headers do not contain non-tagged fields. |
266 if (offset_in_bytes < header_size_) return true; | 243 if (offset_in_bytes < header_size_) return true; |
267 int field_index = (offset_in_bytes - header_size_) / kPointerSize; | 244 int field_index = (offset_in_bytes - header_size_) / kPointerSize; |
268 | 245 |
269 return layout_descriptor_->IsTagged(field_index); | 246 return layout_descriptor_->IsTagged(field_index); |
270 } | 247 } |
271 } | 248 } |
272 } // namespace v8::internal | 249 } // namespace v8::internal |
273 | 250 |
274 #endif // V8_LAYOUT_DESCRIPTOR_INL_H_ | 251 #endif // V8_LAYOUT_DESCRIPTOR_INL_H_ |
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