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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 { |
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46 return details.field_index() < inobject_properties; | 46 return details.field_index() < inobject_properties; |
47 } | 47 } |
48 | 48 |
49 | 49 |
50 LayoutDescriptor* LayoutDescriptor::FastPointerLayout() { | 50 LayoutDescriptor* LayoutDescriptor::FastPointerLayout() { |
51 return LayoutDescriptor::FromSmi(Smi::FromInt(0)); | 51 return LayoutDescriptor::FromSmi(Smi::FromInt(0)); |
52 } | 52 } |
53 | 53 |
54 | 54 |
55 bool LayoutDescriptor::GetIndexes(int field_index, int* layout_word_index, | 55 bool LayoutDescriptor::GetIndexes(int field_index, int* layout_word_index, |
56 uint32_t* layout_mask) { | 56 int* layout_bit_index) { |
57 if (static_cast<unsigned>(field_index) >= static_cast<unsigned>(capacity())) { | 57 if (static_cast<unsigned>(field_index) >= static_cast<unsigned>(capacity())) { |
58 return false; | 58 return false; |
59 } | 59 } |
60 | 60 |
61 *layout_word_index = field_index / kNumberOfBits; | 61 *layout_word_index = field_index / kNumberOfBits; |
62 CHECK((!IsSmi() && (*layout_word_index < length())) || | 62 CHECK((!IsSmi() && (*layout_word_index < length())) || |
63 (IsSmi() && (*layout_word_index < 1))); | 63 (IsSmi() && (*layout_word_index < 1))); |
64 | 64 |
65 int layout_bit_index = field_index % kNumberOfBits; | 65 *layout_bit_index = field_index % kNumberOfBits; |
66 *layout_mask = static_cast<uint32_t>(1) << layout_bit_index; | |
67 return true; | 66 return true; |
68 } | 67 } |
69 | 68 |
70 | 69 |
71 LayoutDescriptor* LayoutDescriptor::SetTagged(int field_index, bool tagged) { | 70 LayoutDescriptor* LayoutDescriptor::SetTagged(int field_index, bool tagged) { |
72 int layout_word_index; | 71 int layout_word_index; |
73 uint32_t layout_mask; | 72 int layout_bit_index; |
74 | 73 |
75 if (!GetIndexes(field_index, &layout_word_index, &layout_mask)) { | 74 if (!GetIndexes(field_index, &layout_word_index, &layout_bit_index)) { |
76 CHECK(false); | 75 CHECK(false); |
77 return this; | 76 return this; |
78 } | 77 } |
| 78 uint32_t layout_mask = static_cast<uint32_t>(1) << layout_bit_index; |
79 | 79 |
80 if (IsSlowLayout()) { | 80 if (IsSlowLayout()) { |
81 uint32_t value = get_scalar(layout_word_index); | 81 uint32_t value = get_scalar(layout_word_index); |
82 if (tagged) { | 82 if (tagged) { |
83 value &= ~layout_mask; | 83 value &= ~layout_mask; |
84 } else { | 84 } else { |
85 value |= layout_mask; | 85 value |= layout_mask; |
86 } | 86 } |
87 set(layout_word_index, value); | 87 set(layout_word_index, value); |
88 return this; | 88 return this; |
89 } else { | 89 } else { |
90 uint32_t value = static_cast<uint32_t>(Smi::cast(this)->value()); | 90 uint32_t value = static_cast<uint32_t>(Smi::cast(this)->value()); |
91 if (tagged) { | 91 if (tagged) { |
92 value &= ~layout_mask; | 92 value &= ~layout_mask; |
93 } else { | 93 } else { |
94 value |= layout_mask; | 94 value |= layout_mask; |
95 } | 95 } |
96 return LayoutDescriptor::FromSmi(Smi::FromInt(static_cast<int>(value))); | 96 return LayoutDescriptor::FromSmi(Smi::FromInt(static_cast<int>(value))); |
97 } | 97 } |
98 } | 98 } |
99 | 99 |
100 | 100 |
101 bool LayoutDescriptor::IsTagged(int field_index) { | 101 bool LayoutDescriptor::IsTagged(int field_index) { |
102 if (IsFastPointerLayout()) return true; | 102 if (IsFastPointerLayout()) return true; |
103 | 103 |
104 int layout_word_index; | 104 int layout_word_index; |
105 uint32_t layout_mask; | 105 int layout_bit_index; |
106 | 106 |
107 if (!GetIndexes(field_index, &layout_word_index, &layout_mask)) { | 107 if (!GetIndexes(field_index, &layout_word_index, &layout_bit_index)) { |
108 // All bits after Out of bounds queries | 108 // All bits after Out of bounds queries |
109 return true; | 109 return true; |
110 } | 110 } |
| 111 uint32_t layout_mask = static_cast<uint32_t>(1) << layout_bit_index; |
111 | 112 |
112 if (IsSlowLayout()) { | 113 if (IsSlowLayout()) { |
113 uint32_t value = get_scalar(layout_word_index); | 114 uint32_t value = get_scalar(layout_word_index); |
114 return (value & layout_mask) == 0; | 115 return (value & layout_mask) == 0; |
115 } else { | 116 } else { |
116 uint32_t value = static_cast<uint32_t>(Smi::cast(this)->value()); | 117 uint32_t value = static_cast<uint32_t>(Smi::cast(this)->value()); |
117 return (value & layout_mask) == 0; | 118 return (value & layout_mask) == 0; |
118 } | 119 } |
119 } | 120 } |
120 | 121 |
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148 if (map_word.IsForwardingAddress()) { | 149 if (map_word.IsForwardingAddress()) { |
149 // Mark-compact has already moved layout descriptor. | 150 // Mark-compact has already moved layout descriptor. |
150 object = map_word.ToForwardingAddress(); | 151 object = map_word.ToForwardingAddress(); |
151 } | 152 } |
152 return LayoutDescriptor::cast(object); | 153 return LayoutDescriptor::cast(object); |
153 } | 154 } |
154 | 155 |
155 | 156 |
156 // InobjectPropertiesHelper is a helper class for querying whether inobject | 157 // InobjectPropertiesHelper is a helper class for querying whether inobject |
157 // property at offset is Double or not. | 158 // property at offset is Double or not. |
158 InobjectPropertiesHelper::InobjectPropertiesHelper(Map* map) | 159 LayoutDescriptorHelper::LayoutDescriptorHelper(Map* map) |
159 : all_fields_tagged_(true), | 160 : all_fields_tagged_(true), |
160 header_size_(0), | 161 header_size_(0), |
161 layout_descriptor_(LayoutDescriptor::FastPointerLayout()) { | 162 layout_descriptor_(LayoutDescriptor::FastPointerLayout()) { |
162 if (!FLAG_unbox_double_fields) return; | 163 if (!FLAG_unbox_double_fields) return; |
163 | 164 |
164 layout_descriptor_ = map->layout_descriptor_gc_safe(); | 165 layout_descriptor_ = map->layout_descriptor_gc_safe(); |
165 if (layout_descriptor_->IsFastPointerLayout()) { | 166 if (layout_descriptor_->IsFastPointerLayout()) { |
166 return; | 167 return; |
167 } | 168 } |
168 | 169 |
169 int inobject_properties = map->inobject_properties(); | 170 int inobject_properties = map->inobject_properties(); |
170 DCHECK(inobject_properties > 0); | 171 DCHECK(inobject_properties > 0); |
171 header_size_ = map->instance_size() - (inobject_properties * kPointerSize); | 172 header_size_ = map->instance_size() - (inobject_properties * kPointerSize); |
172 DCHECK(header_size_ >= 0); | 173 DCHECK(header_size_ >= 0); |
173 | 174 |
174 all_fields_tagged_ = false; | 175 all_fields_tagged_ = false; |
175 } | 176 } |
176 | 177 |
177 | 178 |
178 bool InobjectPropertiesHelper::IsTagged(int offset_in_bytes) { | 179 bool LayoutDescriptorHelper::IsTagged(int offset_in_bytes) { |
179 DCHECK(IsAligned(offset_in_bytes, kPointerSize)); | 180 DCHECK(IsAligned(offset_in_bytes, kPointerSize)); |
180 if (all_fields_tagged_) return true; | 181 if (all_fields_tagged_) return true; |
181 // Object headers do not contain non-tagged fields. | 182 // Object headers do not contain non-tagged fields. |
182 if (offset_in_bytes < header_size_) return true; | 183 if (offset_in_bytes < header_size_) return true; |
183 int field_index = (offset_in_bytes - header_size_) / kPointerSize; | 184 int field_index = (offset_in_bytes - header_size_) / kPointerSize; |
184 | 185 |
185 return layout_descriptor_->IsTagged(field_index); | 186 return layout_descriptor_->IsTagged(field_index); |
186 } | 187 } |
187 } | 188 } |
188 } // namespace v8::internal | 189 } // namespace v8::internal |
189 | 190 |
190 #endif // V8_LAYOUT_DESCRIPTOR_INL_H_ | 191 #endif // V8_LAYOUT_DESCRIPTOR_INL_H_ |
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