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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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127 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ | 127 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ |
128 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ | 128 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ |
129 call_as_constructor_delegate) \ | 129 call_as_constructor_delegate) \ |
130 V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ | 130 V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ |
131 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ | 131 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ |
132 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ | 132 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ |
133 V(OUT_OF_MEMORY_INDEX, Object, out_of_memory) \ | 133 V(OUT_OF_MEMORY_INDEX, Object, out_of_memory) \ |
134 V(MAP_CACHE_INDEX, Object, map_cache) \ | 134 V(MAP_CACHE_INDEX, Object, map_cache) \ |
135 V(CONTEXT_DATA_INDEX, Object, data) \ | 135 V(CONTEXT_DATA_INDEX, Object, data) \ |
136 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ | 136 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ |
| 137 V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \ |
| 138 to_complete_property_descriptor) \ |
137 V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \ | 139 V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \ |
138 V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ | 140 V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ |
139 V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) | 141 V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) |
140 | 142 |
141 // JSFunctions are pairs (context, function code), sometimes also called | 143 // JSFunctions are pairs (context, function code), sometimes also called |
142 // closures. A Context object is used to represent function contexts and | 144 // closures. A Context object is used to represent function contexts and |
143 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). | 145 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). |
144 // | 146 // |
145 // At runtime, the contexts build a stack in parallel to the execution | 147 // At runtime, the contexts build a stack in parallel to the execution |
146 // stack, with the top-most context being the current context. All contexts | 148 // stack, with the top-most context being the current context. All contexts |
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245 NORMALIZED_MAP_CACHE_INDEX, | 247 NORMALIZED_MAP_CACHE_INDEX, |
246 RUNTIME_CONTEXT_INDEX, | 248 RUNTIME_CONTEXT_INDEX, |
247 CALL_AS_FUNCTION_DELEGATE_INDEX, | 249 CALL_AS_FUNCTION_DELEGATE_INDEX, |
248 CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, | 250 CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, |
249 SCRIPT_FUNCTION_INDEX, | 251 SCRIPT_FUNCTION_INDEX, |
250 OPAQUE_REFERENCE_FUNCTION_INDEX, | 252 OPAQUE_REFERENCE_FUNCTION_INDEX, |
251 CONTEXT_EXTENSION_FUNCTION_INDEX, | 253 CONTEXT_EXTENSION_FUNCTION_INDEX, |
252 OUT_OF_MEMORY_INDEX, | 254 OUT_OF_MEMORY_INDEX, |
253 CONTEXT_DATA_INDEX, | 255 CONTEXT_DATA_INDEX, |
254 ALLOW_CODE_GEN_FROM_STRINGS_INDEX, | 256 ALLOW_CODE_GEN_FROM_STRINGS_INDEX, |
| 257 TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, |
255 DERIVED_HAS_TRAP_INDEX, | 258 DERIVED_HAS_TRAP_INDEX, |
256 DERIVED_GET_TRAP_INDEX, | 259 DERIVED_GET_TRAP_INDEX, |
257 DERIVED_SET_TRAP_INDEX, | 260 DERIVED_SET_TRAP_INDEX, |
258 | 261 |
259 // Properties from here are treated as weak references by the full GC. | 262 // Properties from here are treated as weak references by the full GC. |
260 // Scavenge treats them as strong references. | 263 // Scavenge treats them as strong references. |
261 OPTIMIZED_FUNCTIONS_LIST, // Weak. | 264 OPTIMIZED_FUNCTIONS_LIST, // Weak. |
262 MAP_CACHE_INDEX, // Weak. | 265 MAP_CACHE_INDEX, // Weak. |
263 NEXT_CONTEXT_LINK, // Weak. | 266 NEXT_CONTEXT_LINK, // Weak. |
264 | 267 |
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323 Map* map = this->map(); | 326 Map* map = this->map(); |
324 return map == map->GetHeap()->block_context_map(); | 327 return map == map->GetHeap()->block_context_map(); |
325 } | 328 } |
326 | 329 |
327 // Tells whether the global context is marked with out of memory. | 330 // Tells whether the global context is marked with out of memory. |
328 inline bool has_out_of_memory(); | 331 inline bool has_out_of_memory(); |
329 | 332 |
330 // Mark the global context with out of memory. | 333 // Mark the global context with out of memory. |
331 inline void mark_out_of_memory(); | 334 inline void mark_out_of_memory(); |
332 | 335 |
333 // The exception holder is the object used as a with object in | |
334 // the implementation of a catch block. | |
335 bool is_exception_holder(Object* object) { | |
336 return IsCatchContext() && extension() == object; | |
337 } | |
338 | |
339 // A global context hold a list of all functions which have been optimized. | 336 // A global context hold a list of all functions which have been optimized. |
340 void AddOptimizedFunction(JSFunction* function); | 337 void AddOptimizedFunction(JSFunction* function); |
341 void RemoveOptimizedFunction(JSFunction* function); | 338 void RemoveOptimizedFunction(JSFunction* function); |
342 Object* OptimizedFunctionsListHead(); | 339 Object* OptimizedFunctionsListHead(); |
343 void ClearOptimizedFunctions(); | 340 void ClearOptimizedFunctions(); |
344 | 341 |
345 #define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \ | 342 #define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \ |
346 void set_##name(type* value) { \ | 343 void set_##name(type* value) { \ |
347 ASSERT(IsGlobalContext()); \ | 344 ASSERT(IsGlobalContext()); \ |
348 set(index, value); \ | 345 set(index, value); \ |
349 } \ | 346 } \ |
350 type* name() { \ | 347 type* name() { \ |
351 ASSERT(IsGlobalContext()); \ | 348 ASSERT(IsGlobalContext()); \ |
352 return type::cast(get(index)); \ | 349 return type::cast(get(index)); \ |
353 } | 350 } |
354 GLOBAL_CONTEXT_FIELDS(GLOBAL_CONTEXT_FIELD_ACCESSORS) | 351 GLOBAL_CONTEXT_FIELDS(GLOBAL_CONTEXT_FIELD_ACCESSORS) |
355 #undef GLOBAL_CONTEXT_FIELD_ACCESSORS | 352 #undef GLOBAL_CONTEXT_FIELD_ACCESSORS |
356 | 353 |
357 // Lookup the the slot called name, starting with the current context. | 354 // Lookup the the slot called name, starting with the current context. |
358 // There are 4 possible outcomes: | 355 // There are three possibilities: |
359 // | 356 // |
360 // 1) index_ >= 0 && result->IsContext(): | 357 // 1) result->IsContext(): |
361 // most common case, the result is a Context, and index is the | 358 // The binding was found in a context. *index is always the |
362 // context slot index, and the slot exists. | 359 // non-negative slot index. *attributes is NONE for var and let |
363 // attributes == READ_ONLY for the function name variable, NONE otherwise. | 360 // declarations, READ_ONLY for const declarations (never ABSENT). |
364 // | 361 // |
365 // 2) index_ >= 0 && result->IsJSObject(): | 362 // 2) result->IsJSObject(): |
366 // the result is the JSObject arguments object, the index is the parameter | 363 // The binding was found as a named property in a context extension |
367 // index, i.e., key into the arguments object, and the property exists. | 364 // object (i.e., was introduced via eval), as a property on the subject |
368 // attributes != ABSENT. | 365 // of with, or as a property of the global object. *index is -1 and |
| 366 // *attributes is not ABSENT. |
369 // | 367 // |
370 // 3) index_ < 0 && result->IsJSObject(): | 368 // 3) result.is_null(): |
371 // the result is the JSObject extension context or the global object, | 369 // There was no binding found, *index is always -1 and *attributes is |
372 // and the name is the property name, and the property exists. | 370 // always ABSENT. |
373 // attributes != ABSENT. | |
374 // | |
375 // 4) index_ < 0 && result.is_null(): | |
376 // there was no context found with the corresponding property. | |
377 // attributes == ABSENT. | |
378 Handle<Object> Lookup(Handle<String> name, | 371 Handle<Object> Lookup(Handle<String> name, |
379 ContextLookupFlags flags, | 372 ContextLookupFlags flags, |
380 int* index_, | 373 int* index, |
381 PropertyAttributes* attributes, | 374 PropertyAttributes* attributes, |
382 BindingFlags* binding_flags); | 375 BindingFlags* binding_flags); |
383 | 376 |
384 // Determine if a local variable with the given name exists in a | 377 // Determine if a local variable with the given name exists in a |
385 // context. Do not consider context extension objects. This is | 378 // context. Do not consider context extension objects. This is |
386 // used for compiling code using eval. If the context surrounding | 379 // used for compiling code using eval. If the context surrounding |
387 // the eval call does not have a local variable with this name and | 380 // the eval call does not have a local variable with this name and |
388 // does not contain a with statement the property is global unless | 381 // does not contain a with statement the property is global unless |
389 // it is shadowed by a property in an extension object introduced by | 382 // it is shadowed by a property in an extension object introduced by |
390 // eval. | 383 // eval. |
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418 #ifdef DEBUG | 411 #ifdef DEBUG |
419 // Bootstrapping-aware type checks. | 412 // Bootstrapping-aware type checks. |
420 static bool IsBootstrappingOrContext(Object* object); | 413 static bool IsBootstrappingOrContext(Object* object); |
421 static bool IsBootstrappingOrGlobalObject(Object* object); | 414 static bool IsBootstrappingOrGlobalObject(Object* object); |
422 #endif | 415 #endif |
423 }; | 416 }; |
424 | 417 |
425 } } // namespace v8::internal | 418 } } // namespace v8::internal |
426 | 419 |
427 #endif // V8_CONTEXTS_H_ | 420 #endif // V8_CONTEXTS_H_ |
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