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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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| 32 | 32 |
| 33 namespace v8 { | 33 namespace v8 { |
| 34 namespace internal { | 34 namespace internal { |
| 35 | 35 |
| 36 // ---------------------------------------------------------------------------- | 36 // ---------------------------------------------------------------------------- |
| 37 // A Handle provides a reference to an object that survives relocation by | 37 // A Handle provides a reference to an object that survives relocation by |
| 38 // the garbage collector. | 38 // the garbage collector. |
| 39 // Handles are only valid within a HandleScope. | 39 // Handles are only valid within a HandleScope. |
| 40 // When a handle is created for an object a cell is allocated in the heap. | 40 // When a handle is created for an object a cell is allocated in the heap. |
| 41 | 41 |
| 42 template<class T> | 42 template<typename T> |
| 43 class Handle { | 43 class Handle { |
| 44 public: | 44 public: |
| 45 INLINE(explicit Handle(T** location)) { location_ = location; } | 45 INLINE(explicit Handle(T** location)) { location_ = location; } |
| 46 INLINE(explicit Handle(T* obj)); | 46 INLINE(explicit Handle(T* obj)); |
| 47 INLINE(Handle(T* obj, Isolate* isolate)); | 47 INLINE(Handle(T* obj, Isolate* isolate)); |
| 48 | 48 |
| 49 INLINE(Handle()) : location_(NULL) {} | 49 INLINE(Handle()) : location_(NULL) {} |
| 50 | 50 |
| 51 // Constructor for handling automatic up casting. | 51 // Constructor for handling automatic up casting. |
| 52 // Ex. Handle<JSFunction> can be passed when Handle<Object> is expected. | 52 // Ex. Handle<JSFunction> can be passed when Handle<Object> is expected. |
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| 120 template <typename T> | 120 template <typename T> |
| 121 static inline T** CreateHandle(T* value, Isolate* isolate); | 121 static inline T** CreateHandle(T* value, Isolate* isolate); |
| 122 | 122 |
| 123 // Deallocates any extensions used by the current scope. | 123 // Deallocates any extensions used by the current scope. |
| 124 static void DeleteExtensions(Isolate* isolate); | 124 static void DeleteExtensions(Isolate* isolate); |
| 125 | 125 |
| 126 static Address current_next_address(); | 126 static Address current_next_address(); |
| 127 static Address current_limit_address(); | 127 static Address current_limit_address(); |
| 128 static Address current_level_address(); | 128 static Address current_level_address(); |
| 129 | 129 |
| 130 // Closes the HandleScope (invalidating all handles |
| 131 // created in the scope of the HandleScope) and returns |
| 132 // a Handle backed by the parent scope holding the |
| 133 // value of the argument handle. |
| 134 template <typename T> |
| 135 Handle<T> CloseAndEscape(Handle<T> handle_value); |
| 136 |
| 130 private: | 137 private: |
| 131 // Prevent heap allocation or illegal handle scopes. | 138 // Prevent heap allocation or illegal handle scopes. |
| 132 HandleScope(const HandleScope&); | 139 HandleScope(const HandleScope&); |
| 133 void operator=(const HandleScope&); | 140 void operator=(const HandleScope&); |
| 134 void* operator new(size_t size); | 141 void* operator new(size_t size); |
| 135 void operator delete(void* size_t); | 142 void operator delete(void* size_t); |
| 136 | 143 |
| 144 inline void CloseScope(); |
| 145 |
| 137 Isolate* isolate_; | 146 Isolate* isolate_; |
| 138 Object** prev_next_; | 147 Object** prev_next_; |
| 139 Object** prev_limit_; | 148 Object** prev_limit_; |
| 140 | 149 |
| 141 // Extend the handle scope making room for more handles. | 150 // Extend the handle scope making room for more handles. |
| 142 static internal::Object** Extend(); | 151 static internal::Object** Extend(); |
| 143 | 152 |
| 144 // Zaps the handles in the half-open interval [start, end). | 153 // Zaps the handles in the half-open interval [start, end). |
| 145 static void ZapRange(internal::Object** start, internal::Object** end); | 154 static void ZapRange(internal::Object** start, internal::Object** end); |
| 146 | 155 |
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| 169 // Flattens a string. | 178 // Flattens a string. |
| 170 void FlattenString(Handle<String> str); | 179 void FlattenString(Handle<String> str); |
| 171 | 180 |
| 172 // Flattens a string and returns the underlying external or sequential | 181 // Flattens a string and returns the underlying external or sequential |
| 173 // string. | 182 // string. |
| 174 Handle<String> FlattenGetString(Handle<String> str); | 183 Handle<String> FlattenGetString(Handle<String> str); |
| 175 | 184 |
| 176 Handle<Object> SetProperty(Handle<JSObject> object, | 185 Handle<Object> SetProperty(Handle<JSObject> object, |
| 177 Handle<String> key, | 186 Handle<String> key, |
| 178 Handle<Object> value, | 187 Handle<Object> value, |
| 179 PropertyAttributes attributes); | 188 PropertyAttributes attributes, |
| 189 StrictModeFlag strict); |
| 180 | 190 |
| 181 Handle<Object> SetProperty(Handle<Object> object, | 191 Handle<Object> SetProperty(Handle<Object> object, |
| 182 Handle<Object> key, | 192 Handle<Object> key, |
| 183 Handle<Object> value, | 193 Handle<Object> value, |
| 184 PropertyAttributes attributes); | 194 PropertyAttributes attributes, |
| 195 StrictModeFlag strict); |
| 185 | 196 |
| 186 Handle<Object> ForceSetProperty(Handle<JSObject> object, | 197 Handle<Object> ForceSetProperty(Handle<JSObject> object, |
| 187 Handle<Object> key, | 198 Handle<Object> key, |
| 188 Handle<Object> value, | 199 Handle<Object> value, |
| 189 PropertyAttributes attributes); | 200 PropertyAttributes attributes); |
| 190 | 201 |
| 191 Handle<Object> SetNormalizedProperty(Handle<JSObject> object, | 202 Handle<Object> SetNormalizedProperty(Handle<JSObject> object, |
| 192 Handle<String> key, | 203 Handle<String> key, |
| 193 Handle<Object> value, | 204 Handle<Object> value, |
| 194 PropertyDetails details); | 205 PropertyDetails details); |
| 195 | 206 |
| 196 Handle<Object> ForceDeleteProperty(Handle<JSObject> object, | 207 Handle<Object> ForceDeleteProperty(Handle<JSObject> object, |
| 197 Handle<Object> key); | 208 Handle<Object> key); |
| 198 | 209 |
| 199 Handle<Object> SetLocalPropertyIgnoreAttributes( | 210 Handle<Object> SetLocalPropertyIgnoreAttributes( |
| 200 Handle<JSObject> object, | 211 Handle<JSObject> object, |
| 201 Handle<String> key, | 212 Handle<String> key, |
| 202 Handle<Object> value, | 213 Handle<Object> value, |
| 203 PropertyAttributes attributes); | 214 PropertyAttributes attributes); |
| 204 | 215 |
| 216 // Used to set local properties on the object we totally control |
| 217 // and which therefore has no accessors and alikes. |
| 218 void SetLocalPropertyNoThrow(Handle<JSObject> object, |
| 219 Handle<String> key, |
| 220 Handle<Object> value, |
| 221 PropertyAttributes attributes = NONE); |
| 222 |
| 205 Handle<Object> SetPropertyWithInterceptor(Handle<JSObject> object, | 223 Handle<Object> SetPropertyWithInterceptor(Handle<JSObject> object, |
| 206 Handle<String> key, | 224 Handle<String> key, |
| 207 Handle<Object> value, | 225 Handle<Object> value, |
| 208 PropertyAttributes attributes); | 226 PropertyAttributes attributes, |
| 227 StrictModeFlag strict); |
| 209 | 228 |
| 210 Handle<Object> SetElement(Handle<JSObject> object, | 229 Handle<Object> SetElement(Handle<JSObject> object, |
| 211 uint32_t index, | 230 uint32_t index, |
| 212 Handle<Object> value); | 231 Handle<Object> value); |
| 213 | 232 |
| 214 Handle<Object> SetOwnElement(Handle<JSObject> object, | 233 Handle<Object> SetOwnElement(Handle<JSObject> object, |
| 215 uint32_t index, | 234 uint32_t index, |
| 216 Handle<Object> value); | 235 Handle<Object> value); |
| 217 | 236 |
| 218 Handle<Object> GetProperty(Handle<JSObject> obj, | 237 Handle<Object> GetProperty(Handle<JSObject> obj, |
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| 319 bool EnsureCompiled(Handle<SharedFunctionInfo> shared, | 338 bool EnsureCompiled(Handle<SharedFunctionInfo> shared, |
| 320 ClearExceptionFlag flag); | 339 ClearExceptionFlag flag); |
| 321 | 340 |
| 322 bool CompileLazyShared(Handle<SharedFunctionInfo> shared, | 341 bool CompileLazyShared(Handle<SharedFunctionInfo> shared, |
| 323 ClearExceptionFlag flag); | 342 ClearExceptionFlag flag); |
| 324 | 343 |
| 325 bool CompileLazy(Handle<JSFunction> function, ClearExceptionFlag flag); | 344 bool CompileLazy(Handle<JSFunction> function, ClearExceptionFlag flag); |
| 326 | 345 |
| 327 bool CompileLazyInLoop(Handle<JSFunction> function, ClearExceptionFlag flag); | 346 bool CompileLazyInLoop(Handle<JSFunction> function, ClearExceptionFlag flag); |
| 328 | 347 |
| 329 bool CompileOptimized(Handle<JSFunction> function, int osr_ast_id); | 348 bool CompileOptimized(Handle<JSFunction> function, |
| 349 int osr_ast_id, |
| 350 ClearExceptionFlag flag); |
| 330 | 351 |
| 331 class NoHandleAllocation BASE_EMBEDDED { | 352 class NoHandleAllocation BASE_EMBEDDED { |
| 332 public: | 353 public: |
| 333 #ifndef DEBUG | 354 #ifndef DEBUG |
| 334 NoHandleAllocation() {} | 355 NoHandleAllocation() {} |
| 335 ~NoHandleAllocation() {} | 356 ~NoHandleAllocation() {} |
| 336 #else | 357 #else |
| 337 inline NoHandleAllocation(); | 358 inline NoHandleAllocation(); |
| 338 inline ~NoHandleAllocation(); | 359 inline ~NoHandleAllocation(); |
| 339 private: | 360 private: |
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| 356 private: | 377 private: |
| 357 bool has_been_transformed_; // Tells whether the object has been transformed. | 378 bool has_been_transformed_; // Tells whether the object has been transformed. |
| 358 int unused_property_fields_; // Captures the unused number of field. | 379 int unused_property_fields_; // Captures the unused number of field. |
| 359 Handle<JSObject> object_; // The object being optimized. | 380 Handle<JSObject> object_; // The object being optimized. |
| 360 }; | 381 }; |
| 361 | 382 |
| 362 | 383 |
| 363 } } // namespace v8::internal | 384 } } // namespace v8::internal |
| 364 | 385 |
| 365 #endif // V8_HANDLES_H_ | 386 #endif // V8_HANDLES_H_ |
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