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 NativeContext; 14 class RegExpMatchInfo; 15 16 enum ContextLookupFlags { 17 FOLLOW_CONTEXT_CHAIN = 1 << 0, 18 FOLLOW_PROTOTYPE_CHAIN = 1 << 1, 19 STOP_AT_DECLARATION_SCOPE = 1 << 2, 20 SKIP_WITH_CONTEXT = 1 << 3, 21 22 DONT_FOLLOW_CHAINS = 0, 23 FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN, 24 }; 25 26 // Heap-allocated activation contexts. 27 // 28 // Contexts are implemented as FixedArray objects; the Context 29 // class is a convenience interface casted on a FixedArray object. 30 // 31 // Note: Context must have no virtual functions and Context objects 32 // must always be allocated via Heap::AllocateContext() or 33 // Factory::NewContext. 34 35 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 36 V(ASYNC_FUNCTION_AWAIT_CAUGHT_INDEX, JSFunction, \ 37 async_function_await_caught) \ 38 V(ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX, JSFunction, \ 39 async_function_await_uncaught) \ 40 V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \ 41 async_function_promise_create) \ 42 V(ASYNC_FUNCTION_PROMISE_RELEASE_INDEX, JSFunction, \ 43 async_function_promise_release) \ 44 V(IS_ARRAYLIKE, JSFunction, is_arraylike) \ 45 V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \ 46 V(MAKE_ERROR_INDEX, JSFunction, make_error) \ 47 V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ 48 V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \ 49 V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ 50 V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \ 51 V(OBJECT_CREATE, JSFunction, object_create) \ 52 V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ 53 V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ 54 V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \ 55 V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \ 56 V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \ 57 V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \ 58 V(OBJECT_KEYS, JSFunction, object_keys) \ 59 V(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match) \ 60 V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \ 61 V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \ 62 V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \ 63 V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \ 64 V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ 65 V(MATH_POW_INDEX, JSFunction, math_pow) \ 66 V(NEW_PROMISE_CAPABILITY_INDEX, JSFunction, new_promise_capability) \ 67 V(PROMISE_INTERNAL_CONSTRUCTOR_INDEX, JSFunction, \ 68 promise_internal_constructor) \ 69 V(IS_PROMISE_INDEX, JSFunction, is_promise) \ 70 V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ 71 V(ASYNC_GENERATOR_AWAIT_CAUGHT, JSFunction, async_generator_await_caught) \ 72 V(ASYNC_GENERATOR_AWAIT_UNCAUGHT, JSFunction, async_generator_await_uncaught) 73 74 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 75 V(ARRAY_SHIFT_INDEX, JSFunction, array_shift) \ 76 V(ARRAY_SPLICE_INDEX, JSFunction, array_splice) \ 77 V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift) \ 78 V(ARRAY_ENTRIES_ITERATOR_INDEX, JSFunction, array_entries_iterator) \ 79 V(ARRAY_FOR_EACH_ITERATOR_INDEX, JSFunction, array_for_each_iterator) \ 80 V(ARRAY_KEYS_ITERATOR_INDEX, JSFunction, array_keys_iterator) \ 81 V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ 82 V(CANONICALIZE_LOCALE_LIST_FUNCTION_INDEX, JSFunction, \ 83 canonicalize_locale_list) \ 84 V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \ 85 V(ERROR_TO_STRING, JSFunction, error_to_string) \ 86 V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \ 87 V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ 88 V(GLOBAL_PROXY_FUNCTION_INDEX, JSFunction, global_proxy_function) \ 89 V(MAP_DELETE_INDEX, JSFunction, map_delete) \ 90 V(MAP_GET_INDEX, JSFunction, map_get) \ 91 V(MAP_HAS_INDEX, JSFunction, map_has) \ 92 V(MAP_SET_INDEX, JSFunction, map_set) \ 93 V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \ 94 V(OBJECT_VALUE_OF, JSFunction, object_value_of) \ 95 V(OBJECT_TO_STRING, JSFunction, object_to_string) \ 96 V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ 97 V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ 98 V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ 99 V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ 100 V(CACHED_OR_NEW_SERVICE_LOCALE_FUNCTION_INDEX, JSFunction, \ 101 cached_or_new_service) \ 102 V(RESOLVE_LOCALE_FUNCTION_INDEX, JSFunction, resolve_locale) \ 103 V(SET_ADD_INDEX, JSFunction, set_add) \ 104 V(SET_DELETE_INDEX, JSFunction, set_delete) \ 105 V(SET_HAS_INDEX, JSFunction, set_has) \ 106 V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \ 107 V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \ 108 V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \ 109 V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \ 110 wasm_compile_error_function) \ 111 V(WASM_LINK_ERROR_FUNCTION_INDEX, JSFunction, wasm_link_error_function) \ 112 V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, \ 113 wasm_runtime_error_function) \ 114 V(WEAKMAP_SET_INDEX, JSFunction, weakmap_set) \ 115 V(WEAKSET_ADD_INDEX, JSFunction, weakset_add) 116 117 #define NATIVE_CONTEXT_FIELDS(V) \ 118 V(GLOBAL_PROXY_INDEX, JSGlobalProxy, global_proxy_object) \ 119 V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ 120 /* Below is alpha-sorted */ \ 121 V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \ 122 accessor_property_descriptor_map) \ 123 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 124 V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ 125 V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \ 126 V(ARRAY_BUFFER_NOINIT_FUN_INDEX, JSFunction, array_buffer_noinit_fun) \ 127 V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 128 V(ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX, Map, async_from_sync_iterator_map) \ 129 V(ASYNC_FUNCTION_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ 130 async_function_await_reject_shared_fun) \ 131 V(ASYNC_FUNCTION_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 132 async_function_await_resolve_shared_fun) \ 133 V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ 134 V(ASYNC_GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 135 async_generator_function_function) \ 136 V(ASYNC_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \ 137 async_iterator_value_unwrap_shared_fun) \ 138 V(ASYNC_GENERATOR_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ 139 async_generator_await_reject_shared_fun) \ 140 V(ASYNC_GENERATOR_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 141 async_generator_await_resolve_shared_fun) \ 142 V(ASYNC_GENERATOR_YIELD_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 143 async_generator_yield_resolve_shared_fun) \ 144 V(ASYNC_GENERATOR_RETURN_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 145 async_generator_return_resolve_shared_fun) \ 146 V(ASYNC_GENERATOR_RETURN_CLOSED_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 147 async_generator_return_closed_resolve_shared_fun) \ 148 V(ASYNC_GENERATOR_RETURN_CLOSED_REJECT_SHARED_FUN, SharedFunctionInfo, \ 149 async_generator_return_closed_reject_shared_fun) \ 150 V(ATOMICS_OBJECT, JSObject, atomics_object) \ 151 V(BIGINT_FUNCTION_INDEX, JSFunction, bigint_function) \ 152 V(BIGINT64_ARRAY_FUN_INDEX, JSFunction, bigint64_array_fun) \ 153 V(BIGUINT64_ARRAY_FUN_INDEX, JSFunction, biguint64_array_fun) \ 154 V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 155 V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \ 156 bound_function_with_constructor_map) \ 157 V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \ 158 bound_function_without_constructor_map) \ 159 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 160 call_as_constructor_delegate) \ 161 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 162 V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \ 163 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 164 V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \ 165 V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ 166 V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 167 V(DEBUG_CONTEXT_ID_INDEX, Object, debug_context_id) \ 168 V(EMPTY_FUNCTION_INDEX, JSFunction, empty_function) \ 169 V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ 170 error_message_for_code_gen_from_strings) \ 171 V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \ 172 V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \ 173 V(EXTRAS_UTILS_OBJECT_INDEX, Object, extras_utils_object) \ 174 V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ 175 V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \ 176 fast_template_instantiations_cache) \ 177 V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ 178 V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ 179 V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \ 180 V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 181 generator_function_function) \ 182 V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ 183 V(ASYNC_GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, \ 184 async_generator_object_prototype_map) \ 185 V(INITIAL_ARRAY_ITERATOR_MAP_INDEX, Map, initial_array_iterator_map) \ 186 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \ 187 initial_array_iterator_prototype) \ 188 V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ 189 V(INITIAL_ERROR_PROTOTYPE_INDEX, JSObject, initial_error_prototype) \ 190 V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ 191 V(INITIAL_ASYNC_GENERATOR_PROTOTYPE_INDEX, JSObject, \ 192 initial_async_generator_prototype) \ 193 V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \ 194 V(INITIAL_MAP_PROTOTYPE_MAP_INDEX, Map, initial_map_prototype_map) \ 195 V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 196 V(INITIAL_SET_PROTOTYPE_MAP_INDEX, Map, initial_set_prototype_map) \ 197 V(INITIAL_STRING_PROTOTYPE_INDEX, JSObject, initial_string_prototype) \ 198 V(INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX, Map, initial_weakmap_prototype_map) \ 199 V(INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX, Map, initial_weakset_prototype_map) \ 200 V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ 201 V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ 202 V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ 203 V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 204 V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ 205 V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \ 206 intl_date_time_format_function) \ 207 V(INTL_DATE_FORMAT_INTERNAL_FORMAT_SHARED_FUN, SharedFunctionInfo, \ 208 date_format_internal_format_shared_fun) \ 209 V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \ 210 intl_number_format_function) \ 211 V(INTL_NUMBER_FORMAT_INTERNAL_FORMAT_NUMBER_SHARED_FUN, SharedFunctionInfo, \ 212 number_format_internal_format_number_shared_fun) \ 213 V(INTL_LOCALE_FUNCTION_INDEX, JSFunction, intl_locale_function) \ 214 V(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \ 215 V(INTL_COLLATOR_INTERNAL_COMPARE_SHARED_FUN, SharedFunctionInfo, \ 216 collator_internal_compare_shared_fun) \ 217 V(INTL_PLURAL_RULES_FUNCTION_INDEX, JSFunction, intl_plural_rules_function) \ 218 V(INTL_V8_BREAK_ITERATOR_FUNCTION_INDEX, JSFunction, \ 219 intl_v8_break_iterator_function) \ 220 V(INTL_V8_BREAK_ITERATOR_INTERNAL_ADOPT_TEXT_SHARED_FUN, SharedFunctionInfo, \ 221 break_iterator_internal_adopt_text_shared_fun) \ 222 V(JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, Map, \ 223 js_array_packed_smi_elements_map) \ 224 V(JS_ARRAY_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ 225 js_array_holey_smi_elements_map) \ 226 V(JS_ARRAY_PACKED_ELEMENTS_MAP_INDEX, Map, js_array_packed_elements_map) \ 227 V(JS_ARRAY_HOLEY_ELEMENTS_MAP_INDEX, Map, js_array_holey_elements_map) \ 228 V(JS_ARRAY_PACKED_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 229 js_array_packed_double_elements_map) \ 230 V(JS_ARRAY_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 231 js_array_holey_double_elements_map) \ 232 V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ 233 V(JS_MAP_MAP_INDEX, Map, js_map_map) \ 234 V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \ 235 V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ 236 V(JS_SET_MAP_INDEX, Map, js_set_map) \ 237 V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ 238 V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ 239 V(MAP_CACHE_INDEX, Object, map_cache) \ 240 V(MAP_KEY_ITERATOR_MAP_INDEX, Map, map_key_iterator_map) \ 241 V(MAP_KEY_VALUE_ITERATOR_MAP_INDEX, Map, map_key_value_iterator_map) \ 242 V(MAP_VALUE_ITERATOR_MAP_INDEX, Map, map_value_iterator_map) \ 243 V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \ 244 V(MATH_RANDOM_CACHE_INDEX, Object, math_random_cache) \ 245 V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \ 246 V(NATIVES_UTILS_OBJECT_INDEX, Object, natives_utils_object) \ 247 V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ 248 V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 249 V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 250 V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \ 251 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 252 V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \ 253 V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \ 254 V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \ 255 V(PROXY_MAP_INDEX, Map, proxy_map) \ 256 V(PROXY_REVOCABLE_RESULT_MAP_INDEX, Map, proxy_revocable_result_map) \ 257 V(PROXY_REVOKE_SHARED_FUN, SharedFunctionInfo, proxy_revoke_shared_fun) \ 258 V(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \ 259 promise_get_capabilities_executor_shared_fun) \ 260 V(PROMISE_CAPABILITY_DEFAULT_REJECT_SHARED_FUN_INDEX, SharedFunctionInfo, \ 261 promise_capability_default_reject_shared_fun) \ 262 V(PROMISE_CAPABILITY_DEFAULT_RESOLVE_SHARED_FUN_INDEX, SharedFunctionInfo, \ 263 promise_capability_default_resolve_shared_fun) \ 264 V(PROMISE_THEN_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 265 promise_then_finally_shared_fun) \ 266 V(PROMISE_CATCH_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 267 promise_catch_finally_shared_fun) \ 268 V(PROMISE_VALUE_THUNK_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 269 promise_value_thunk_finally_shared_fun) \ 270 V(PROMISE_THROWER_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 271 promise_thrower_finally_shared_fun) \ 272 V(PROMISE_ALL_RESOLVE_ELEMENT_SHARED_FUN, SharedFunctionInfo, \ 273 promise_all_resolve_element_shared_fun) \ 274 V(PROMISE_PROTOTYPE_INDEX, JSObject, promise_prototype) \ 275 V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \ 276 V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 277 V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \ 278 V(REGEXP_INTERNAL_MATCH_INFO_INDEX, RegExpMatchInfo, \ 279 regexp_internal_match_info) \ 280 V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \ 281 V(INITIAL_REGEXP_STRING_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \ 282 initial_regexp_string_iterator_prototype_map) \ 283 V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ 284 V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ 285 V(SECURITY_TOKEN_INDEX, Object, security_token) \ 286 V(SERIALIZED_OBJECTS, FixedArray, serialized_objects) \ 287 V(SET_VALUE_ITERATOR_MAP_INDEX, Map, set_value_iterator_map) \ 288 V(SET_KEY_VALUE_ITERATOR_MAP_INDEX, Map, set_key_value_iterator_map) \ 289 V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ 290 V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ 291 V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ 292 V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ 293 V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \ 294 slow_object_with_null_prototype_map) \ 295 V(SLOW_OBJECT_WITH_OBJECT_PROTOTYPE_MAP, Map, \ 296 slow_object_with_object_prototype_map) \ 297 V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, SimpleNumberDictionary, \ 298 slow_template_instantiations_cache) \ 299 /* All *_FUNCTION_MAP_INDEX definitions used by Context::FunctionMapIndex */ \ 300 /* must remain together. */ \ 301 V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ 302 V(SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX, Map, sloppy_function_with_name_map) \ 303 V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 304 sloppy_function_without_prototype_map) \ 305 V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 306 sloppy_function_with_readonly_prototype_map) \ 307 V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ 308 V(STRICT_FUNCTION_WITH_NAME_MAP_INDEX, Map, strict_function_with_name_map) \ 309 V(STRICT_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 310 strict_function_with_readonly_prototype_map) \ 311 V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 312 strict_function_without_prototype_map) \ 313 V(METHOD_WITH_NAME_MAP_INDEX, Map, method_with_name_map) \ 314 V(METHOD_WITH_HOME_OBJECT_MAP_INDEX, Map, method_with_home_object_map) \ 315 V(METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 316 method_with_name_and_home_object_map) \ 317 V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \ 318 V(ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, Map, async_function_with_name_map) \ 319 V(ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 320 async_function_with_home_object_map) \ 321 V(ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 322 async_function_with_name_and_home_object_map) \ 323 V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \ 324 V(GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ 325 generator_function_with_name_map) \ 326 V(GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 327 generator_function_with_home_object_map) \ 328 V(GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 329 generator_function_with_name_and_home_object_map) \ 330 V(ASYNC_GENERATOR_FUNCTION_MAP_INDEX, Map, async_generator_function_map) \ 331 V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ 332 async_generator_function_with_name_map) \ 333 V(ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ 334 async_generator_function_with_home_object_map) \ 335 V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ 336 async_generator_function_with_name_and_home_object_map) \ 337 V(CLASS_FUNCTION_MAP_INDEX, Map, class_function_map) \ 338 V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 339 V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 340 V(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \ 341 V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ 342 V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \ 343 V(WASM_GLOBAL_CONSTRUCTOR_INDEX, JSFunction, wasm_global_constructor) \ 344 V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ 345 V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \ 346 V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ 347 V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \ 348 V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \ 349 V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \ 350 V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ 351 V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ 352 V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ 353 V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ 354 NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 355 NATIVE_CONTEXT_IMPORTED_FIELDS(V) 356 357 // A table of all script contexts. Every loaded top-level script with top-level 358 // lexical declarations contributes its ScriptContext into this table. 359 // 360 // The table is a fixed array, its first slot is the current used count and 361 // the subsequent slots 1..used contain ScriptContexts. 362 class ScriptContextTable : public FixedArray { 363 public: 364 // Conversions. 365 static inline ScriptContextTable* cast(Object* context); 366 367 struct LookupResult { 368 int context_index; 369 int slot_index; 370 VariableMode mode; 371 InitializationFlag init_flag; 372 MaybeAssignedFlag maybe_assigned_flag; 373 }; 374 375 inline int used() const; 376 inline void set_used(int used); 377 378 static inline Handle<Context> GetContext(Isolate* isolate, 379 Handle<ScriptContextTable> table, 380 int i); 381 382 // Lookup a variable `name` in a ScriptContextTable. 383 // If it returns true, the variable is found and `result` contains 384 // valid information about its location. 385 // If it returns false, `result` is untouched. 386 V8_WARN_UNUSED_RESULT 387 static bool Lookup(Isolate* isolate, Handle<ScriptContextTable> table, 388 Handle<String> name, LookupResult* result); 389 390 V8_WARN_UNUSED_RESULT 391 static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, 392 Handle<Context> script_context); 393 394 static const int kUsedSlotIndex = 0; 395 static const int kFirstContextSlotIndex = 1; 396 static const int kMinLength = kFirstContextSlotIndex; 397 398 DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); 399 }; 400 401 // JSFunctions are pairs (context, function code), sometimes also called 402 // closures. A Context object is used to represent function contexts and 403 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 404 // 405 // At runtime, the contexts build a stack in parallel to the execution 406 // stack, with the top-most context being the current context. All contexts 407 // have the following slots: 408 // 409 // [ scope_info ] This is the scope info describing the current context. It 410 // contains the names of statically allocated context slots, 411 // and stack-allocated locals. The names are needed for 412 // dynamic lookups in the presence of 'with' or 'eval', and 413 // for the debugger. 414 // 415 // [ previous ] A pointer to the previous context. 416 // 417 // [ extension ] Additional data. 418 // 419 // For module contexts, it contains the module object. 420 // 421 // For block contexts, it may contain an "extension object" 422 // (see below). 423 // 424 // For with contexts, it contains an "extension object". 425 // 426 // An "extension object" is used to dynamically extend a 427 // context with additional variables, namely in the 428 // implementation of the 'with' construct and the 'eval' 429 // construct. For instance, Context::Lookup also searches 430 // the extension object for properties. (Storing the 431 // extension object is the original purpose of this context 432 // slot, hence the name.) 433 // 434 // [ native_context ] A pointer to the native context. 435 // 436 // In addition, function contexts may have statically allocated context slots 437 // to store local variables/functions that are accessed from inner functions 438 // (via static context addresses) or through 'eval' (dynamic context lookups). 439 // The native context contains additional slots for fast access to native 440 // properties. 441 // 442 // Finally, with Harmony scoping, the JSFunction representing a top level 443 // script will have the ScriptContext rather than a FunctionContext. 444 // Script contexts from all top-level scripts are gathered in 445 // ScriptContextTable. 446 447 class Context : public FixedArray, public NeverReadOnlySpaceObject { 448 public: 449 // Use the mixin methods over the HeapObject methods. 450 // TODO(v8:7786) Remove once the HeapObject methods are gone. 451 using NeverReadOnlySpaceObject::GetHeap; 452 using NeverReadOnlySpaceObject::GetIsolate; 453 454 // Conversions. 455 static inline Context* cast(Object* context); 456 457 // The default context slot layout; indices are FixedArray slot indices. 458 enum Field { 459 // These slots are in all contexts. 460 SCOPE_INFO_INDEX, 461 PREVIOUS_INDEX, 462 // The extension slot is used for either the global object (in native 463 // contexts), eval extension object (function contexts), subject of with 464 // (with contexts), or the variable name (catch contexts), the serialized 465 // scope info (block contexts), or the module instance (module contexts). 466 EXTENSION_INDEX, 467 NATIVE_CONTEXT_INDEX, 468 469 // These slots are only in native contexts. 470 #define NATIVE_CONTEXT_SLOT(index, type, name) index, 471 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT) 472 #undef NATIVE_CONTEXT_SLOT 473 474 // Properties from here are treated as weak references by the full GC. 475 // Scavenge treats them as strong references. 476 OPTIMIZED_CODE_LIST, // Weak. 477 DEOPTIMIZED_CODE_LIST, // Weak. 478 NEXT_CONTEXT_LINK, // Weak. 479 480 // Total number of slots. 481 NATIVE_CONTEXT_SLOTS, 482 FIRST_WEAK_SLOT = OPTIMIZED_CODE_LIST, 483 FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, 484 485 MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX, 486 // This slot holds the thrown value in catch contexts. 487 THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 488 489 // These slots hold values in debug evaluate contexts. 490 WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS, 491 WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1 492 }; 493 494 // A region of native context entries containing maps for functions created 495 // by Builtins::kFastNewClosure. 496 static const int FIRST_FUNCTION_MAP_INDEX = SLOPPY_FUNCTION_MAP_INDEX; 497 static const int LAST_FUNCTION_MAP_INDEX = CLASS_FUNCTION_MAP_INDEX; 498 499 static const int kNoContext = 0; 500 static const int kInvalidContext = 1; 501 502 void ResetErrorsThrown(); 503 void IncrementErrorsThrown(); 504 int GetErrorsThrown(); 505 506 // Direct slot access. 507 inline void set_scope_info(ScopeInfo* scope_info); 508 inline Context* previous(); 509 inline void set_previous(Context* context); 510 511 inline Object* next_context_link(); 512 513 inline bool has_extension(); 514 inline HeapObject* extension(); 515 inline void set_extension(HeapObject* object); 516 JSObject* extension_object(); 517 JSReceiver* extension_receiver(); 518 ScopeInfo* scope_info(); 519 520 // Find the module context (assuming there is one) and return the associated 521 // module object. 522 Module* module(); 523 524 // Get the context where var declarations will be hoisted to, which 525 // may be the context itself. 526 Context* declaration_context(); 527 bool is_declaration_context(); 528 529 // Get the next closure's context on the context chain. 530 Context* closure_context(); 531 532 // Returns a JSGlobalProxy object or null. 533 JSGlobalProxy* global_proxy(); 534 void set_global_proxy(JSGlobalProxy* global); 535 536 // Get the JSGlobalObject object. 537 V8_EXPORT_PRIVATE JSGlobalObject* global_object(); 538 539 // Get the script context by traversing the context chain. 540 Context* script_context(); 541 542 // Compute the native context. 543 inline NativeContext* native_context() const; 544 inline void set_native_context(NativeContext* context); 545 546 // Predicates for context types. IsNativeContext is already defined on 547 // Object. 548 inline bool IsFunctionContext() const; 549 inline bool IsCatchContext() const; 550 inline bool IsWithContext() const; 551 inline bool IsDebugEvaluateContext() const; 552 inline bool IsBlockContext() const; 553 inline bool IsModuleContext() const; 554 inline bool IsEvalContext() const; 555 inline bool IsScriptContext() const; 556 557 inline bool HasSameSecurityTokenAs(Context* that) const; 558 559 // The native context also stores a list of all optimized code and a 560 // list of all deoptimized code, which are needed by the deoptimizer. 561 void AddOptimizedCode(Code* code); 562 void SetOptimizedCodeListHead(Object* head); 563 Object* OptimizedCodeListHead(); 564 void SetDeoptimizedCodeListHead(Object* head); 565 Object* DeoptimizedCodeListHead(); 566 567 Handle<Object> ErrorMessageForCodeGenerationFromStrings(); 568 569 static int ImportedFieldIndexForName(Handle<String> name); 570 static int IntrinsicIndexForName(Handle<String> name); 571 static int IntrinsicIndexForName(const unsigned char* name, int length); 572 573 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 574 inline void set_##name(type* value); \ 575 inline bool is_##name(type* value) const; \ 576 inline type* name() const; 577 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 578 #undef NATIVE_CONTEXT_FIELD_ACCESSORS 579 580 // Lookup the slot called name, starting with the current context. 581 // There are three possibilities: 582 // 583 // 1) result->IsContext(): 584 // The binding was found in a context. *index is always the 585 // non-negative slot index. *attributes is NONE for var and let 586 // declarations, READ_ONLY for const declarations (never ABSENT). 587 // 588 // 2) result->IsJSObject(): 589 // The binding was found as a named property in a context extension 590 // object (i.e., was introduced via eval), as a property on the subject 591 // of with, or as a property of the global object. *index is -1 and 592 // *attributes is not ABSENT. 593 // 594 // 3) result->IsModule(): 595 // The binding was found in module imports or exports. 596 // *attributes is never ABSENT. imports are READ_ONLY. 597 // 598 // 4) result.is_null(): 599 // There was no binding found, *index is always -1 and *attributes is 600 // always ABSENT. 601 Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags, 602 int* index, PropertyAttributes* attributes, 603 InitializationFlag* init_flag, 604 VariableMode* variable_mode, 605 bool* is_sloppy_function_name = nullptr); 606 607 // Code generation support. 608 static int SlotOffset(int index) { 609 return kHeaderSize + index * kPointerSize - kHeapObjectTag; 610 } 611 612 static inline int FunctionMapIndex(LanguageMode language_mode, 613 FunctionKind kind, bool has_prototype_slot, 614 bool has_shared_name, 615 bool needs_home_object); 616 617 static int ArrayMapIndex(ElementsKind elements_kind) { 618 DCHECK(IsFastElementsKind(elements_kind)); 619 return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; 620 } 621 622 inline Map* GetInitialJSArrayMap(ElementsKind kind) const; 623 624 static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; 625 static const int kNotFound = -1; 626 627 // GC support. 628 typedef FixedBodyDescriptor<kHeaderSize, kSize, kSize> BodyDescriptor; 629 630 typedef FixedBodyDescriptor< 631 kHeaderSize, kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, kSize> 632 BodyDescriptorWeak; 633 634 private: 635 #ifdef DEBUG 636 // Bootstrapping-aware type checks. 637 V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate, 638 Object* object); 639 static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); 640 #endif 641 642 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 643 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 644 }; 645 646 class NativeContext : public Context { 647 public: 648 static inline NativeContext* cast(Object* context); 649 // TODO(neis): Move some stuff from Context here. 650 651 private: 652 DISALLOW_IMPLICIT_CONSTRUCTORS(NativeContext); 653 }; 654 655 typedef Context::Field ContextField; 656 657 } // namespace internal 658 } // namespace v8 659 660 #endif // V8_CONTEXTS_H_ 661
