1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_CONTEXTS_H_ 6 #define V8_CONTEXTS_H_ 7 8 #include "src/objects/fixed-array.h" 9 10 namespace v8 { 11 namespace internal { 12 13 class RegExpMatchInfo; 14 15 enum ContextLookupFlags { 16 FOLLOW_CONTEXT_CHAIN = 1 << 0, 17 FOLLOW_PROTOTYPE_CHAIN = 1 << 1, 18 STOP_AT_DECLARATION_SCOPE = 1 << 2, 19 SKIP_WITH_CONTEXT = 1 << 3, 20 21 DONT_FOLLOW_CHAINS = 0, 22 FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN, 23 }; 24 25 // Heap-allocated activation contexts. 26 // 27 // Contexts are implemented as FixedArray objects; the Context 28 // class is a convenience interface casted on a FixedArray object. 29 // 30 // Note: Context must have no virtual functions and Context objects 31 // must always be allocated via Heap::AllocateContext() or 32 // Factory::NewContext. 33 34 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 35 V(ASYNC_FUNCTION_AWAIT_CAUGHT_INDEX, JSFunction, \ 36 async_function_await_caught) \ 37 V(ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX, JSFunction, \ 38 async_function_await_uncaught) \ 39 V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \ 40 async_function_promise_create) \ 41 V(ASYNC_FUNCTION_PROMISE_RELEASE_INDEX, JSFunction, \ 42 async_function_promise_release) \ 43 V(IS_ARRAYLIKE, JSFunction, is_arraylike) \ 44 V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \ 45 V(MAKE_ERROR_INDEX, JSFunction, make_error) \ 46 V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ 47 V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \ 48 V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ 49 V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \ 50 V(OBJECT_CREATE, JSFunction, object_create) \ 51 V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ 52 V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ 53 V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \ 54 V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \ 55 V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \ 56 V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \ 57 V(OBJECT_KEYS, JSFunction, object_keys) \ 58 V(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match) \ 59 V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \ 60 V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \ 61 V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \ 62 V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \ 63 V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ 64 V(MATH_POW_INDEX, JSFunction, math_pow) \ 65 V(NEW_PROMISE_CAPABILITY_INDEX, JSFunction, new_promise_capability) \ 66 V(PROMISE_INTERNAL_CONSTRUCTOR_INDEX, JSFunction, \ 67 promise_internal_constructor) \ 68 V(IS_PROMISE_INDEX, JSFunction, is_promise) \ 69 V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ 70 V(ASYNC_GENERATOR_AWAIT_CAUGHT, JSFunction, async_generator_await_caught) \ 71 V(ASYNC_GENERATOR_AWAIT_UNCAUGHT, JSFunction, async_generator_await_uncaught) 72 73 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 74 V(ARRAY_POP_INDEX, JSFunction, array_pop) \ 75 V(ARRAY_PUSH_INDEX, JSFunction, array_push) \ 76 V(ARRAY_SHIFT_INDEX, JSFunction, array_shift) \ 77 V(ARRAY_SPLICE_INDEX, JSFunction, array_splice) \ 78 V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift) \ 79 V(ARRAY_ENTRIES_ITERATOR_INDEX, JSFunction, array_entries_iterator) \ 80 V(ARRAY_FOR_EACH_ITERATOR_INDEX, JSFunction, array_for_each_iterator) \ 81 V(ARRAY_KEYS_ITERATOR_INDEX, JSFunction, array_keys_iterator) \ 82 V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ 83 V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \ 84 V(ERROR_TO_STRING, JSFunction, error_to_string) \ 85 V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \ 86 V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ 87 V(GLOBAL_PROXY_FUNCTION_INDEX, JSFunction, global_proxy_function) \ 88 V(MAP_DELETE_INDEX, JSFunction, map_delete) \ 89 V(MAP_GET_INDEX, JSFunction, map_get) \ 90 V(MAP_HAS_INDEX, JSFunction, map_has) \ 91 V(MAP_SET_INDEX, JSFunction, map_set) \ 92 V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \ 93 V(OBJECT_VALUE_OF, JSFunction, object_value_of) \ 94 V(OBJECT_TO_STRING, JSFunction, object_to_string) \ 95 V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ 96 V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ 97 V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ 98 V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ 99 V(SET_ADD_INDEX, JSFunction, set_add) \ 100 V(SET_DELETE_INDEX, JSFunction, set_delete) \ 101 V(SET_HAS_INDEX, JSFunction, set_has) \ 102 V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \ 103 V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \ 104 V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \ 105 V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \ 106 wasm_compile_error_function) \ 107 V(WASM_LINK_ERROR_FUNCTION_INDEX, JSFunction, wasm_link_error_function) \ 108 V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, \ 109 wasm_runtime_error_function) \ 110 V(WEAKMAP_SET_INDEX, JSFunction, weakmap_set) \ 111 V(WEAKMAP_GET_INDEX, JSFunction, weakmap_get) \ 112 V(WEAKSET_ADD_INDEX, JSFunction, weakset_add) 113 114 #define NATIVE_CONTEXT_FIELDS(V) \ 115 V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ 116 V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ 117 /* Below is alpha-sorted */ \ 118 V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \ 119 accessor_property_descriptor_map) \ 120 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 121 V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ 122 V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \ 123 V(ARRAY_BUFFER_NOINIT_FUN_INDEX, JSFunction, array_buffer_noinit_fun) \ 124 V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 125 V(ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX, Map, async_from_sync_iterator_map) \ 126 V(ASYNC_FUNCTION_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ 127 async_function_await_reject_shared_fun) \ 128 V(ASYNC_FUNCTION_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 129 async_function_await_resolve_shared_fun) \ 130 V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ 131 V(ASYNC_GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 132 async_generator_function_function) \ 133 V(ASYNC_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \ 134 async_iterator_value_unwrap_shared_fun) \ 135 V(ASYNC_GENERATOR_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ 136 async_generator_await_reject_shared_fun) \ 137 V(ASYNC_GENERATOR_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 138 async_generator_await_resolve_shared_fun) \ 139 V(ASYNC_GENERATOR_YIELD_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 140 async_generator_yield_resolve_shared_fun) \ 141 V(ASYNC_GENERATOR_RETURN_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 142 async_generator_return_resolve_shared_fun) \ 143 V(ASYNC_GENERATOR_RETURN_CLOSED_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 144 async_generator_return_closed_resolve_shared_fun) \ 145 V(ASYNC_GENERATOR_RETURN_CLOSED_REJECT_SHARED_FUN, SharedFunctionInfo, \ 146 async_generator_return_closed_reject_shared_fun) \ 147 V(ATOMICS_OBJECT, JSObject, atomics_object) \ 148 V(BIGINT_FUNCTION_INDEX, JSFunction, bigint_function) \ 149 V(BIGINT64_ARRAY_FUN_INDEX, JSFunction, bigint64_array_fun) \ 150 V(BIGUINT64_ARRAY_FUN_INDEX, JSFunction, biguint64_array_fun) \ 151 V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 152 V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \ 153 bound_function_with_constructor_map) \ 154 V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \ 155 bound_function_without_constructor_map) \ 156 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 157 call_as_constructor_delegate) \ 158 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 159 V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \ 160 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 161 V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \ 162 V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ 163 V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 164 V(DEBUG_CONTEXT_ID_INDEX, Object, debug_context_id) \ 165 V(EMPTY_FUNCTION_INDEX, JSFunction, empty_function) \ 166 V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ 167 error_message_for_code_gen_from_strings) \ 168 V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \ 169 V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \ 170 V(EXTRAS_UTILS_OBJECT_INDEX, Object, extras_utils_object) \ 171 V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ 172 V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \ 173 fast_template_instantiations_cache) \ 174 V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ 175 V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ 176 V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \ 177 V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 178 generator_function_function) \ 179 V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ 180 V(ASYNC_GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, \ 181 async_generator_object_prototype_map) \ 182 V(INITIAL_ARRAY_ITERATOR_MAP_INDEX, Map, initial_array_iterator_map) \ 183 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \ 184 initial_array_iterator_prototype) \ 185 V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ 186 V(INITIAL_ERROR_PROTOTYPE_INDEX, JSObject, initial_error_prototype) \ 187 V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ 188 V(INITIAL_ASYNC_GENERATOR_PROTOTYPE_INDEX, JSObject, \ 189 initial_async_generator_prototype) \ 190 V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \ 191 V(INITIAL_MAP_PROTOTYPE_MAP_INDEX, Map, initial_map_prototype_map) \ 192 V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 193 V(INITIAL_SET_PROTOTYPE_MAP_INDEX, Map, initial_set_prototype_map) \ 194 V(INITIAL_STRING_PROTOTYPE_INDEX, JSObject, initial_string_prototype) \ 195 V(INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX, Map, initial_weakmap_prototype_map) \ 196 V(INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX, Map, initial_weakset_prototype_map) \ 197 V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ 198 V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ 199 V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ 200 V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 201 V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ 202 V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \ 203 intl_date_time_format_function) \ 204 V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \ 205 intl_number_format_function) \ 206 V(INTL_LOCALE_FUNCTION_INDEX, JSFunction, intl_locale_function) \ 207 V(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \ 208 V(INTL_PLURAL_RULES_FUNCTION_INDEX, JSFunction, intl_plural_rules_function) \ 209 V(INTL_V8_BREAK_ITERATOR_FUNCTION_INDEX, JSFunction, \ 210 intl_v8_break_iterator_function) \ 211 V(JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, Map, \ 212 js_array_fast_smi_elements_map_index) \ 213 V(JS_ARRAY_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ 214 js_array_fast_holey_smi_elements_map_index) \ 215 V(JS_ARRAY_PACKED_ELEMENTS_MAP_INDEX, Map, js_array_fast_elements_map_index) \ 216 V(JS_ARRAY_HOLEY_ELEMENTS_MAP_INDEX, Map, \ 217 js_array_fast_holey_elements_map_index) \ 218 V(JS_ARRAY_PACKED_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 219 js_array_fast_double_elements_map_index) \ 220 V(JS_ARRAY_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 221 js_array_fast_holey_double_elements_map_index) \ 222 V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ 223 V(JS_MAP_MAP_INDEX, Map, js_map_map) \ 224 V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \ 225 V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ 226 V(JS_SET_MAP_INDEX, Map, js_set_map) \ 227 V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ 228 V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ 229 V(MAP_CACHE_INDEX, Object, map_cache) \ 230 V(MAP_KEY_ITERATOR_MAP_INDEX, Map, map_key_iterator_map) \ 231 V(MAP_KEY_VALUE_ITERATOR_MAP_INDEX, Map, map_key_value_iterator_map) \ 232 V(MAP_VALUE_ITERATOR_MAP_INDEX, Map, map_value_iterator_map) \ 233 V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \ 234 V(MATH_RANDOM_CACHE_INDEX, Object, math_random_cache) \ 235 V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \ 236 V(NATIVES_UTILS_OBJECT_INDEX, Object, natives_utils_object) \ 237 V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ 238 V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 239 V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 240 V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \ 241 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 242 V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \ 243 V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \ 244 V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \ 245 V(PROXY_MAP_INDEX, Map, proxy_map) \ 246 V(PROXY_REVOCABLE_RESULT_MAP_INDEX, Map, proxy_revocable_result_map) \ 247 V(PROXY_REVOKE_SHARED_FUN, SharedFunctionInfo, proxy_revoke_shared_fun) \ 248 V(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \ 249 promise_get_capabilities_executor_shared_fun) \ 250 V(PROMISE_CAPABILITY_DEFAULT_REJECT_SHARED_FUN_INDEX, SharedFunctionInfo, \ 251 promise_capability_default_reject_shared_fun) \ 252 V(PROMISE_CAPABILITY_DEFAULT_RESOLVE_SHARED_FUN_INDEX, SharedFunctionInfo, \ 253 promise_capability_default_resolve_shared_fun) \ 254 V(PROMISE_THEN_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 255 promise_then_finally_shared_fun) \ 256 V(PROMISE_CATCH_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 257 promise_catch_finally_shared_fun) \ 258 V(PROMISE_VALUE_THUNK_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 259 promise_value_thunk_finally_shared_fun) \ 260 V(PROMISE_THROWER_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 261 promise_thrower_finally_shared_fun) \ 262 V(PROMISE_ALL_RESOLVE_ELEMENT_SHARED_FUN, SharedFunctionInfo, \ 263 promise_all_resolve_element_shared_fun) \ 264 V(PROMISE_PROTOTYPE_INDEX, JSObject, promise_prototype) \ 265 V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \ 266 V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 267 V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \ 268 V(REGEXP_INTERNAL_MATCH_INFO_INDEX, RegExpMatchInfo, \ 269 regexp_internal_match_info) \ 270 V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \ 271 V(INITIAL_REGEXP_STRING_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \ 272 initial_regexp_string_iterator_prototype_map_index) \ 273 V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ 274 V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ 275 V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ 276 V(SECURITY_TOKEN_INDEX, Object, security_token) \ 277 V(SELF_WEAK_CELL_INDEX, WeakCell, self_weak_cell) \ 278 V(SERIALIZED_OBJECTS, FixedArray, serialized_objects) \ 279 V(SET_VALUE_ITERATOR_MAP_INDEX, Map, set_value_iterator_map) \ 280 V(SET_KEY_VALUE_ITERATOR_MAP_INDEX, Map, set_key_value_iterator_map) \ 281 V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ 282 V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ 283 V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ 284 V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ 285 V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \ 286 slow_object_with_null_prototype_map) \ 287 V(SLOW_OBJECT_WITH_OBJECT_PROTOTYPE_MAP, Map, \ 288 slow_object_with_object_prototype_map) \ 289 V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, SimpleNumberDictionary, \ 290 slow_template_instantiations_cache) \ 291 /* All *_FUNCTION_MAP_INDEX definitions used by Context::FunctionMapIndex */ \ 292 /* must remain together. */ \ 293 V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ 294 V(SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX, Map, sloppy_function_with_name_map) \ 295 V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 296 sloppy_function_without_prototype_map) \ 297 V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 298 sloppy_function_with_readonly_prototype_map) \ 299 V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ 300 V(STRICT_FUNCTION_WITH_NAME_MAP_INDEX, Map, strict_function_with_name_map) \ 301 V(STRICT_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 302 strict_function_with_readonly_prototype_map) \ 303 V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 304 strict_function_without_prototype_map) \ 305 V(METHOD_WITH_NAME_MAP_INDEX, Map, method_with_name_map) \ 306 V(METHOD_WITH_HOME_OBJECT_MAP_INDEX, Map, method_with_home_object_map) \ 307 V(METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 308 method_with_name_and_home_object_map) \ 309 V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \ 310 V(ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, Map, async_function_with_name_map) \ 311 V(ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 312 async_function_with_home_object_map) \ 313 V(ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 314 async_function_with_name_and_home_object_map) \ 315 V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \ 316 V(GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ 317 generator_function_with_name_map) \ 318 V(GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 319 generator_function_with_home_object_map) \ 320 V(GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 321 generator_function_with_name_and_home_object_map) \ 322 V(ASYNC_GENERATOR_FUNCTION_MAP_INDEX, Map, async_generator_function_map) \ 323 V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ 324 async_generator_function_with_name_map) \ 325 V(ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 326 async_generator_function_with_home_object_map) \ 327 V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 328 async_generator_function_with_name_and_home_object_map) \ 329 V(CLASS_FUNCTION_MAP_INDEX, Map, class_function_map) \ 330 V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 331 V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 332 V(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \ 333 V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ 334 V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \ 335 V(WASM_GLOBAL_CONSTRUCTOR_INDEX, JSFunction, wasm_global_constructor) \ 336 V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ 337 V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \ 338 V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ 339 V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \ 340 V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \ 341 V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \ 342 V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ 343 V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ 344 V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ 345 V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ 346 NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 347 NATIVE_CONTEXT_IMPORTED_FIELDS(V) 348 349 // A table of all script contexts. Every loaded top-level script with top-level 350 // lexical declarations contributes its ScriptContext into this table. 351 // 352 // The table is a fixed array, its first slot is the current used count and 353 // the subsequent slots 1..used contain ScriptContexts. 354 class ScriptContextTable : public FixedArray { 355 public: 356 // Conversions. 357 static inline ScriptContextTable* cast(Object* context); 358 359 struct LookupResult { 360 int context_index; 361 int slot_index; 362 VariableMode mode; 363 InitializationFlag init_flag; 364 MaybeAssignedFlag maybe_assigned_flag; 365 }; 366 367 inline int used() const; 368 inline void set_used(int used); 369 370 static inline Handle<Context> GetContext(Handle<ScriptContextTable> table, 371 int i); 372 373 // Lookup a variable `name` in a ScriptContextTable. 374 // If it returns true, the variable is found and `result` contains 375 // valid information about its location. 376 // If it returns false, `result` is untouched. 377 V8_WARN_UNUSED_RESULT 378 static bool Lookup(Handle<ScriptContextTable> table, Handle<String> name, 379 LookupResult* result); 380 381 V8_WARN_UNUSED_RESULT 382 static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, 383 Handle<Context> script_context); 384 385 static const int kUsedSlotIndex = 0; 386 static const int kFirstContextSlotIndex = 1; 387 static const int kMinLength = kFirstContextSlotIndex; 388 389 DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); 390 }; 391 392 // JSFunctions are pairs (context, function code), sometimes also called 393 // closures. A Context object is used to represent function contexts and 394 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 395 // 396 // At runtime, the contexts build a stack in parallel to the execution 397 // stack, with the top-most context being the current context. All contexts 398 // have the following slots: 399 // 400 // [ scope_info ] This is the scope info describing the current context. It 401 // contains the names of statically allocated context slots, 402 // and stack-allocated locals. The names are needed for 403 // dynamic lookups in the presence of 'with' or 'eval', and 404 // for the debugger. 405 // 406 // [ previous ] A pointer to the previous context. 407 // 408 // [ extension ] Additional data. 409 // 410 // For module contexts, it contains the module object. 411 // 412 // For block contexts, it may contain an "extension object" 413 // (see below). 414 // 415 // For with contexts, it contains an "extension object". 416 // 417 // An "extension object" is used to dynamically extend a 418 // context with additional variables, namely in the 419 // implementation of the 'with' construct and the 'eval' 420 // construct. For instance, Context::Lookup also searches 421 // the extension object for properties. (Storing the 422 // extension object is the original purpose of this context 423 // slot, hence the name.) 424 // 425 // [ native_context ] A pointer to the native context. 426 // 427 // In addition, function contexts may have statically allocated context slots 428 // to store local variables/functions that are accessed from inner functions 429 // (via static context addresses) or through 'eval' (dynamic context lookups). 430 // The native context contains additional slots for fast access to native 431 // properties. 432 // 433 // Finally, with Harmony scoping, the JSFunction representing a top level 434 // script will have the ScriptContext rather than a FunctionContext. 435 // Script contexts from all top-level scripts are gathered in 436 // ScriptContextTable. 437 438 class Context : public FixedArray { 439 public: 440 // Conversions. 441 static inline Context* cast(Object* context); 442 443 // The default context slot layout; indices are FixedArray slot indices. 444 enum Field { 445 // These slots are in all contexts. 446 SCOPE_INFO_INDEX, 447 PREVIOUS_INDEX, 448 // The extension slot is used for either the global object (in native 449 // contexts), eval extension object (function contexts), subject of with 450 // (with contexts), or the variable name (catch contexts), the serialized 451 // scope info (block contexts), or the module instance (module contexts). 452 EXTENSION_INDEX, 453 NATIVE_CONTEXT_INDEX, 454 455 // These slots are only in native contexts. 456 #define NATIVE_CONTEXT_SLOT(index, type, name) index, 457 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT) 458 #undef NATIVE_CONTEXT_SLOT 459 460 // Properties from here are treated as weak references by the full GC. 461 // Scavenge treats them as strong references. 462 OPTIMIZED_CODE_LIST, // Weak. 463 DEOPTIMIZED_CODE_LIST, // Weak. 464 NEXT_CONTEXT_LINK, // Weak. 465 466 // Total number of slots. 467 NATIVE_CONTEXT_SLOTS, 468 FIRST_WEAK_SLOT = OPTIMIZED_CODE_LIST, 469 FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, 470 471 MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX, 472 // This slot holds the thrown value in catch contexts. 473 THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 474 475 // These slots hold values in debug evaluate contexts. 476 WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS, 477 WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1 478 }; 479 480 // A region of native context entries containing maps for functions created 481 // by Builtins::kFastNewClosure. 482 static const int FIRST_FUNCTION_MAP_INDEX = SLOPPY_FUNCTION_MAP_INDEX; 483 static const int LAST_FUNCTION_MAP_INDEX = CLASS_FUNCTION_MAP_INDEX; 484 485 static const int kNoContext = 0; 486 static const int kInvalidContext = 1; 487 488 void ResetErrorsThrown(); 489 void IncrementErrorsThrown(); 490 int GetErrorsThrown(); 491 492 // Direct slot access. 493 inline void set_scope_info(ScopeInfo* scope_info); 494 inline Context* previous(); 495 inline void set_previous(Context* context); 496 497 inline Object* next_context_link(); 498 499 inline bool has_extension(); 500 inline HeapObject* extension(); 501 inline void set_extension(HeapObject* object); 502 JSObject* extension_object(); 503 JSReceiver* extension_receiver(); 504 ScopeInfo* scope_info(); 505 506 // Find the module context (assuming there is one) and return the associated 507 // module object. 508 Module* module(); 509 510 // Get the context where var declarations will be hoisted to, which 511 // may be the context itself. 512 Context* declaration_context(); 513 bool is_declaration_context(); 514 515 // Get the next closure's context on the context chain. 516 Context* closure_context(); 517 518 // Returns a JSGlobalProxy object or null. 519 JSObject* global_proxy(); 520 void set_global_proxy(JSObject* global); 521 522 // Get the JSGlobalObject object. 523 V8_EXPORT_PRIVATE JSGlobalObject* global_object(); 524 525 // Get the script context by traversing the context chain. 526 Context* script_context(); 527 528 // Compute the native context. 529 inline Context* native_context() const; 530 inline void set_native_context(Context* context); 531 532 // Predicates for context types. IsNativeContext is also defined on Object 533 // because we frequently have to know if arbitrary objects are natives 534 // contexts. 535 inline bool IsNativeContext() const; 536 inline bool IsFunctionContext() const; 537 inline bool IsCatchContext() const; 538 inline bool IsWithContext() const; 539 inline bool IsDebugEvaluateContext() const; 540 inline bool IsBlockContext() const; 541 inline bool IsModuleContext() const; 542 inline bool IsEvalContext() const; 543 inline bool IsScriptContext() const; 544 545 inline bool HasSameSecurityTokenAs(Context* that) const; 546 547 // The native context also stores a list of all optimized code and a 548 // list of all deoptimized code, which are needed by the deoptimizer. 549 void AddOptimizedCode(Code* code); 550 void SetOptimizedCodeListHead(Object* head); 551 Object* OptimizedCodeListHead(); 552 void SetDeoptimizedCodeListHead(Object* head); 553 Object* DeoptimizedCodeListHead(); 554 555 Handle<Object> ErrorMessageForCodeGenerationFromStrings(); 556 557 static int ImportedFieldIndexForName(Handle<String> name); 558 static int IntrinsicIndexForName(Handle<String> name); 559 static int IntrinsicIndexForName(const unsigned char* name, int length); 560 561 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 562 inline void set_##name(type* value); \ 563 inline bool is_##name(type* value) const; \ 564 inline type* name() const; 565 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 566 #undef NATIVE_CONTEXT_FIELD_ACCESSORS 567 568 // Lookup the slot called name, starting with the current context. 569 // There are three possibilities: 570 // 571 // 1) result->IsContext(): 572 // The binding was found in a context. *index is always the 573 // non-negative slot index. *attributes is NONE for var and let 574 // declarations, READ_ONLY for const declarations (never ABSENT). 575 // 576 // 2) result->IsJSObject(): 577 // The binding was found as a named property in a context extension 578 // object (i.e., was introduced via eval), as a property on the subject 579 // of with, or as a property of the global object. *index is -1 and 580 // *attributes is not ABSENT. 581 // 582 // 3) result->IsModule(): 583 // The binding was found in module imports or exports. 584 // *attributes is never ABSENT. imports are READ_ONLY. 585 // 586 // 4) result.is_null(): 587 // There was no binding found, *index is always -1 and *attributes is 588 // always ABSENT. 589 Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags, 590 int* index, PropertyAttributes* attributes, 591 InitializationFlag* init_flag, 592 VariableMode* variable_mode, 593 bool* is_sloppy_function_name = nullptr); 594 595 // Code generation support. SlotOffset(int index)596 static int SlotOffset(int index) { 597 return kHeaderSize + index * kPointerSize - kHeapObjectTag; 598 } 599 600 static inline int FunctionMapIndex(LanguageMode language_mode, 601 FunctionKind kind, bool has_prototype_slot, 602 bool has_shared_name, 603 bool needs_home_object); 604 ArrayMapIndex(ElementsKind elements_kind)605 static int ArrayMapIndex(ElementsKind elements_kind) { 606 DCHECK(IsFastElementsKind(elements_kind)); 607 return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; 608 } 609 610 inline Map* GetInitialJSArrayMap(ElementsKind kind) const; 611 612 static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; 613 static const int kNotFound = -1; 614 615 // GC support. 616 typedef FixedBodyDescriptor<kHeaderSize, kSize, kSize> BodyDescriptor; 617 618 typedef FixedBodyDescriptor< 619 kHeaderSize, kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, kSize> 620 BodyDescriptorWeak; 621 622 private: 623 #ifdef DEBUG 624 // Bootstrapping-aware type checks. 625 V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate, 626 Object* object); 627 static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); 628 #endif 629 630 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 631 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 632 }; 633 634 typedef Context::Field ContextField; 635 636 } // namespace internal 637 } // namespace v8 638 639 #endif // V8_CONTEXTS_H_ 640