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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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107 static SerializedScopeInfo* cast(Object* object) { | 107 static SerializedScopeInfo* cast(Object* object) { |
108 ASSERT(object->IsFixedArray()); | 108 ASSERT(object->IsFixedArray()); |
109 return reinterpret_cast<SerializedScopeInfo*>(object); | 109 return reinterpret_cast<SerializedScopeInfo*>(object); |
110 } | 110 } |
111 | 111 |
112 // Does this scope call eval? | 112 // Does this scope call eval? |
113 bool CallsEval(); | 113 bool CallsEval(); |
114 | 114 |
115 // Does this scope have an arguments shadow? | 115 // Does this scope have an arguments shadow? |
116 bool HasArgumentsShadow() { | 116 bool HasArgumentsShadow() { |
117 return StackSlotIndex(Heap::arguments_shadow_symbol()) >= 0; | 117 return StackSlotIndex(GetHeap()->arguments_shadow_symbol()) >= 0; |
118 } | 118 } |
119 | 119 |
120 // Return the number of stack slots for code. | 120 // Return the number of stack slots for code. |
121 int NumberOfStackSlots(); | 121 int NumberOfStackSlots(); |
122 | 122 |
123 // Return the number of context slots for code. | 123 // Return the number of context slots for code. |
124 int NumberOfContextSlots(); | 124 int NumberOfContextSlots(); |
125 | 125 |
126 // Return if this has context slots besides MIN_CONTEXT_SLOTS; | 126 // Return if this has context slots besides MIN_CONTEXT_SLOTS; |
127 bool HasHeapAllocatedLocals(); | 127 bool HasHeapAllocatedLocals(); |
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166 | 166 |
167 | 167 |
168 // Cache for mapping (data, property name) into context slot index. | 168 // Cache for mapping (data, property name) into context slot index. |
169 // The cache contains both positive and negative results. | 169 // The cache contains both positive and negative results. |
170 // Slot index equals -1 means the property is absent. | 170 // Slot index equals -1 means the property is absent. |
171 // Cleared at startup and prior to mark sweep collection. | 171 // Cleared at startup and prior to mark sweep collection. |
172 class ContextSlotCache { | 172 class ContextSlotCache { |
173 public: | 173 public: |
174 // Lookup context slot index for (data, name). | 174 // Lookup context slot index for (data, name). |
175 // If absent, kNotFound is returned. | 175 // If absent, kNotFound is returned. |
176 static int Lookup(Object* data, | 176 int Lookup(Object* data, |
177 String* name, | 177 String* name, |
178 Variable::Mode* mode); | 178 Variable::Mode* mode); |
179 | 179 |
180 // Update an element in the cache. | 180 // Update an element in the cache. |
181 static void Update(Object* data, | 181 void Update(Object* data, |
| 182 String* name, |
| 183 Variable::Mode mode, |
| 184 int slot_index); |
| 185 |
| 186 // Clear the cache. |
| 187 void Clear(); |
| 188 |
| 189 static const int kNotFound = -2; |
| 190 private: |
| 191 ContextSlotCache() { |
| 192 for (int i = 0; i < kLength; ++i) { |
| 193 keys_[i].data = NULL; |
| 194 keys_[i].name = NULL; |
| 195 values_[i] = kNotFound; |
| 196 } |
| 197 } |
| 198 |
| 199 inline static int Hash(Object* data, String* name); |
| 200 |
| 201 #ifdef DEBUG |
| 202 void ValidateEntry(Object* data, |
182 String* name, | 203 String* name, |
183 Variable::Mode mode, | 204 Variable::Mode mode, |
184 int slot_index); | 205 int slot_index); |
185 | |
186 // Clear the cache. | |
187 static void Clear(); | |
188 | |
189 static const int kNotFound = -2; | |
190 private: | |
191 inline static int Hash(Object* data, String* name); | |
192 | |
193 #ifdef DEBUG | |
194 static void ValidateEntry(Object* data, | |
195 String* name, | |
196 Variable::Mode mode, | |
197 int slot_index); | |
198 #endif | 206 #endif |
199 | 207 |
200 static const int kLength = 256; | 208 static const int kLength = 256; |
201 struct Key { | 209 struct Key { |
202 Object* data; | 210 Object* data; |
203 String* name; | 211 String* name; |
204 }; | 212 }; |
205 | 213 |
206 struct Value { | 214 struct Value { |
207 Value(Variable::Mode mode, int index) { | 215 Value(Variable::Mode mode, int index) { |
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221 int index() { return IndexField::decode(value_); } | 229 int index() { return IndexField::decode(value_); } |
222 | 230 |
223 // Bit fields in value_ (type, shift, size). Must be public so the | 231 // Bit fields in value_ (type, shift, size). Must be public so the |
224 // constants can be embedded in generated code. | 232 // constants can be embedded in generated code. |
225 class ModeField: public BitField<Variable::Mode, 0, 3> {}; | 233 class ModeField: public BitField<Variable::Mode, 0, 3> {}; |
226 class IndexField: public BitField<int, 3, 32-3> {}; | 234 class IndexField: public BitField<int, 3, 32-3> {}; |
227 private: | 235 private: |
228 uint32_t value_; | 236 uint32_t value_; |
229 }; | 237 }; |
230 | 238 |
231 static Key keys_[kLength]; | 239 Key keys_[kLength]; |
232 static uint32_t values_[kLength]; | 240 uint32_t values_[kLength]; |
| 241 |
| 242 friend class Isolate; |
| 243 DISALLOW_COPY_AND_ASSIGN(ContextSlotCache); |
233 }; | 244 }; |
234 | 245 |
235 | 246 |
236 } } // namespace v8::internal | 247 } } // namespace v8::internal |
237 | 248 |
238 #endif // V8_SCOPEINFO_H_ | 249 #endif // V8_SCOPEINFO_H_ |
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