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/heap/heap.h" 9 #include "src/objects.h" 10 11 namespace v8 { 12 namespace internal { 13 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 LEXICAL_TEST = 25 FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT, 26 }; 27 28 29 // Heap-allocated activation contexts. 30 // 31 // Contexts are implemented as FixedArray objects; the Context 32 // class is a convenience interface casted on a FixedArray object. 33 // 34 // Note: Context must have no virtual functions and Context objects 35 // must always be allocated via Heap::AllocateContext() or 36 // Factory::NewContext. 37 38 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 39 V(ASYNC_FUNCTION_AWAIT_CAUGHT_INDEX, JSFunction, \ 40 async_function_await_caught) \ 41 V(ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX, JSFunction, \ 42 async_function_await_uncaught) \ 43 V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \ 44 async_function_promise_create) \ 45 V(ASYNC_FUNCTION_PROMISE_RELEASE_INDEX, JSFunction, \ 46 async_function_promise_release) \ 47 V(IS_ARRAYLIKE, JSFunction, is_arraylike) \ 48 V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \ 49 V(GET_TEMPLATE_CALL_SITE_INDEX, JSFunction, get_template_call_site) \ 50 V(MAKE_ERROR_INDEX, JSFunction, make_error) \ 51 V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ 52 V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \ 53 V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ 54 V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \ 55 V(OBJECT_CREATE, JSFunction, object_create) \ 56 V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ 57 V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ 58 V(OBJECT_FREEZE, JSFunction, object_freeze) \ 59 V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \ 60 V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \ 61 V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \ 62 V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \ 63 V(OBJECT_KEYS, JSFunction, object_keys) \ 64 V(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match) \ 65 V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \ 66 V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \ 67 V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \ 68 V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \ 69 V(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments) \ 70 V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable) \ 71 V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ 72 V(MATH_POW_INDEX, JSFunction, math_pow) \ 73 V(NEW_PROMISE_CAPABILITY_INDEX, JSFunction, new_promise_capability) \ 74 V(PROMISE_INTERNAL_CONSTRUCTOR_INDEX, JSFunction, \ 75 promise_internal_constructor) \ 76 V(PROMISE_INTERNAL_REJECT_INDEX, JSFunction, promise_internal_reject) \ 77 V(IS_PROMISE_INDEX, JSFunction, is_promise) \ 78 V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \ 79 V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ 80 V(PROMISE_HANDLE_INDEX, JSFunction, promise_handle) \ 81 V(PROMISE_HANDLE_REJECT_INDEX, JSFunction, promise_handle_reject) 82 83 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 84 V(ARRAY_CONCAT_INDEX, JSFunction, array_concat) \ 85 V(ARRAY_POP_INDEX, JSFunction, array_pop) \ 86 V(ARRAY_PUSH_INDEX, JSFunction, array_push) \ 87 V(ARRAY_SHIFT_INDEX, JSFunction, array_shift) \ 88 V(ARRAY_SPLICE_INDEX, JSFunction, array_splice) \ 89 V(ARRAY_SLICE_INDEX, JSFunction, array_slice) \ 90 V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift) \ 91 V(ARRAY_ENTRIES_ITERATOR_INDEX, JSFunction, array_entries_iterator) \ 92 V(ARRAY_FOR_EACH_ITERATOR_INDEX, JSFunction, array_for_each_iterator) \ 93 V(ARRAY_KEYS_ITERATOR_INDEX, JSFunction, array_keys_iterator) \ 94 V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ 95 V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ 96 V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \ 97 V(ERROR_TO_STRING, JSFunction, error_to_string) \ 98 V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \ 99 V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ 100 V(GLOBAL_PROXY_FUNCTION_INDEX, JSFunction, global_proxy_function) \ 101 V(MAP_DELETE_METHOD_INDEX, JSFunction, map_delete) \ 102 V(MAP_GET_METHOD_INDEX, JSFunction, map_get) \ 103 V(MAP_HAS_METHOD_INDEX, JSFunction, map_has) \ 104 V(MAP_SET_METHOD_INDEX, JSFunction, map_set) \ 105 V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \ 106 V(OBJECT_VALUE_OF, JSFunction, object_value_of) \ 107 V(OBJECT_TO_STRING, JSFunction, object_to_string) \ 108 V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ 109 V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ 110 V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ 111 V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ 112 V(SET_ADD_METHOD_INDEX, JSFunction, set_add) \ 113 V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete) \ 114 V(SET_HAS_METHOD_INDEX, JSFunction, set_has) \ 115 V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \ 116 V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \ 117 V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \ 118 V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \ 119 wasm_compile_error_function) \ 120 V(WASM_LINK_ERROR_FUNCTION_INDEX, JSFunction, wasm_link_error_function) \ 121 V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, wasm_runtime_error_function) 122 123 #define NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(V) \ 124 V(TYPED_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, typed_array_key_iterator_map) \ 125 V(FAST_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, fast_array_key_iterator_map) \ 126 V(GENERIC_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, array_key_iterator_map) \ 127 \ 128 V(UINT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 129 uint8_array_key_value_iterator_map) \ 130 V(INT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 131 int8_array_key_value_iterator_map) \ 132 V(UINT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 133 uint16_array_key_value_iterator_map) \ 134 V(INT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 135 int16_array_key_value_iterator_map) \ 136 V(UINT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 137 uint32_array_key_value_iterator_map) \ 138 V(INT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 139 int32_array_key_value_iterator_map) \ 140 V(FLOAT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 141 float32_array_key_value_iterator_map) \ 142 V(FLOAT64_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 143 float64_array_key_value_iterator_map) \ 144 V(UINT8_CLAMPED_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 145 uint8_clamped_array_key_value_iterator_map) \ 146 \ 147 V(FAST_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 148 fast_smi_array_key_value_iterator_map) \ 149 V(FAST_HOLEY_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 150 fast_holey_smi_array_key_value_iterator_map) \ 151 V(FAST_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 152 fast_array_key_value_iterator_map) \ 153 V(FAST_HOLEY_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 154 fast_holey_array_key_value_iterator_map) \ 155 V(FAST_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 156 fast_double_array_key_value_iterator_map) \ 157 V(FAST_HOLEY_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 158 fast_holey_double_array_key_value_iterator_map) \ 159 V(GENERIC_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 160 array_key_value_iterator_map) \ 161 \ 162 V(UINT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, uint8_array_value_iterator_map) \ 163 V(INT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int8_array_value_iterator_map) \ 164 V(UINT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 165 uint16_array_value_iterator_map) \ 166 V(INT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int16_array_value_iterator_map) \ 167 V(UINT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 168 uint32_array_value_iterator_map) \ 169 V(INT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int32_array_value_iterator_map) \ 170 V(FLOAT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 171 float32_array_value_iterator_map) \ 172 V(FLOAT64_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 173 float64_array_value_iterator_map) \ 174 V(UINT8_CLAMPED_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 175 uint8_clamped_array_value_iterator_map) \ 176 \ 177 V(FAST_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 178 fast_smi_array_value_iterator_map) \ 179 V(FAST_HOLEY_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 180 fast_holey_smi_array_value_iterator_map) \ 181 V(FAST_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, fast_array_value_iterator_map) \ 182 V(FAST_HOLEY_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 183 fast_holey_array_value_iterator_map) \ 184 V(FAST_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 185 fast_double_array_value_iterator_map) \ 186 V(FAST_HOLEY_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 187 fast_holey_double_array_value_iterator_map) \ 188 V(GENERIC_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, array_value_iterator_map) 189 190 #define NATIVE_CONTEXT_FIELDS(V) \ 191 V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ 192 V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ 193 /* Below is alpha-sorted */ \ 194 V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \ 195 accessor_property_descriptor_map) \ 196 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 197 V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ 198 V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \ 199 V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 200 V(ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX, Map, async_from_sync_iterator_map) \ 201 V(ASYNC_FUNCTION_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ 202 async_function_await_reject_shared_fun) \ 203 V(ASYNC_FUNCTION_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 204 async_function_await_resolve_shared_fun) \ 205 V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ 206 V(ASYNC_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \ 207 async_iterator_value_unwrap_shared_fun) \ 208 V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 209 V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \ 210 bound_function_with_constructor_map) \ 211 V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \ 212 bound_function_without_constructor_map) \ 213 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 214 call_as_constructor_delegate) \ 215 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 216 V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \ 217 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 218 V(CURRENT_MODULE_INDEX, Module, current_module) \ 219 V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \ 220 V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ 221 V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 222 V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ 223 error_message_for_code_gen_from_strings) \ 224 V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \ 225 V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \ 226 V(EXTRAS_UTILS_OBJECT_INDEX, Object, extras_utils_object) \ 227 V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ 228 V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \ 229 fast_template_instantiations_cache) \ 230 V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ 231 V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ 232 V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \ 233 V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 234 generator_function_function) \ 235 V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ 236 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \ 237 initial_array_iterator_prototype) \ 238 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \ 239 initial_array_iterator_prototype_map) \ 240 V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ 241 V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ 242 V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \ 243 V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 244 V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ 245 V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ 246 V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ 247 V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 248 V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ 249 V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \ 250 intl_date_time_format_function) \ 251 V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \ 252 intl_number_format_function) \ 253 V(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \ 254 V(INTL_V8_BREAK_ITERATOR_FUNCTION_INDEX, JSFunction, \ 255 intl_v8_break_iterator_function) \ 256 V(JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, Map, \ 257 js_array_fast_smi_elements_map_index) \ 258 V(JS_ARRAY_FAST_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ 259 js_array_fast_holey_smi_elements_map_index) \ 260 V(JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, Map, js_array_fast_elements_map_index) \ 261 V(JS_ARRAY_FAST_HOLEY_ELEMENTS_MAP_INDEX, Map, \ 262 js_array_fast_holey_elements_map_index) \ 263 V(JS_ARRAY_FAST_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 264 js_array_fast_double_elements_map_index) \ 265 V(JS_ARRAY_FAST_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 266 js_array_fast_holey_double_elements_map_index) \ 267 V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ 268 V(JS_MAP_MAP_INDEX, Map, js_map_map) \ 269 V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \ 270 V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ 271 V(JS_SET_MAP_INDEX, Map, js_set_map) \ 272 V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ 273 V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ 274 V(MAP_CACHE_INDEX, Object, map_cache) \ 275 V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \ 276 V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \ 277 V(MATH_RANDOM_CACHE_INDEX, Object, math_random_cache) \ 278 V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \ 279 V(NATIVES_UTILS_OBJECT_INDEX, Object, natives_utils_object) \ 280 V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ 281 V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 282 V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 283 V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \ 284 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 285 V(OSR_CODE_TABLE_INDEX, FixedArray, osr_code_table) \ 286 V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \ 287 V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \ 288 V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \ 289 V(PROXY_FUNCTION_MAP_INDEX, Map, proxy_function_map) \ 290 V(PROXY_MAP_INDEX, Map, proxy_map) \ 291 V(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \ 292 promise_get_capabilities_executor_shared_fun) \ 293 V(PROMISE_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 294 promise_resolve_shared_fun) \ 295 V(PROMISE_REJECT_SHARED_FUN, SharedFunctionInfo, promise_reject_shared_fun) \ 296 V(PROMISE_THEN_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 297 promise_then_finally_shared_fun) \ 298 V(PROMISE_CATCH_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 299 promise_catch_finally_shared_fun) \ 300 V(PROMISE_VALUE_THUNK_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 301 promise_value_thunk_finally_shared_fun) \ 302 V(PROMISE_THROWER_FINALLY_SHARED_FUN, SharedFunctionInfo, \ 303 promise_thrower_finally_shared_fun) \ 304 V(PROMISE_PROTOTYPE_MAP_INDEX, Map, promise_prototype_map) \ 305 V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \ 306 V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 307 V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \ 308 V(REGEXP_INTERNAL_MATCH_INFO_INDEX, RegExpMatchInfo, \ 309 regexp_internal_match_info) \ 310 V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \ 311 V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ 312 V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ 313 V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ 314 V(SECURITY_TOKEN_INDEX, Object, security_token) \ 315 V(SELF_WEAK_CELL_INDEX, WeakCell, self_weak_cell) \ 316 V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map) \ 317 V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ 318 V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ 319 V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ 320 V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 321 sloppy_function_without_prototype_map) \ 322 V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 323 sloppy_function_with_readonly_prototype_map) \ 324 V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ 325 V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \ 326 slow_object_with_null_prototype_map) \ 327 V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, UnseededNumberDictionary, \ 328 slow_template_instantiations_cache) \ 329 V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ 330 V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \ 331 V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ 332 V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 333 strict_function_without_prototype_map) \ 334 V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \ 335 V(CLASS_FUNCTION_MAP_INDEX, Map, class_function_map) \ 336 V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 337 V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 338 V(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \ 339 V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ 340 V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \ 341 V(WASM_FUNCTION_MAP_INDEX, Map, wasm_function_map) \ 342 V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ 343 V(WASM_INSTANCE_SYM_INDEX, Symbol, wasm_instance_sym) \ 344 V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \ 345 V(WASM_MEMORY_SYM_INDEX, Symbol, wasm_memory_sym) \ 346 V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ 347 V(WASM_MODULE_SYM_INDEX, Symbol, wasm_module_sym) \ 348 V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \ 349 V(WASM_TABLE_SYM_INDEX, Symbol, wasm_table_sym) \ 350 V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \ 351 V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \ 352 V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ 353 V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ 354 V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ 355 V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ 356 V(EXPORTS_CONTAINER, Object, exports_container) \ 357 NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 358 NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 359 NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(V) 360 361 // A table of all script contexts. Every loaded top-level script with top-level 362 // lexical declarations contributes its ScriptContext into this table. 363 // 364 // The table is a fixed array, its first slot is the current used count and 365 // the subsequent slots 1..used contain ScriptContexts. 366 class ScriptContextTable : public FixedArray { 367 public: 368 // Conversions. 369 static inline ScriptContextTable* cast(Object* context); 370 371 struct LookupResult { 372 int context_index; 373 int slot_index; 374 VariableMode mode; 375 InitializationFlag init_flag; 376 MaybeAssignedFlag maybe_assigned_flag; 377 }; 378 379 inline int used() const; 380 inline void set_used(int used); 381 382 static inline Handle<Context> GetContext(Handle<ScriptContextTable> table, 383 int i); 384 385 // Lookup a variable `name` in a ScriptContextTable. 386 // If it returns true, the variable is found and `result` contains 387 // valid information about its location. 388 // If it returns false, `result` is untouched. 389 MUST_USE_RESULT 390 static bool Lookup(Handle<ScriptContextTable> table, Handle<String> name, 391 LookupResult* result); 392 393 MUST_USE_RESULT 394 static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, 395 Handle<Context> script_context); 396 397 static int GetContextOffset(int context_index) { 398 return kFirstContextOffset + context_index * kPointerSize; 399 } 400 401 private: 402 static const int kUsedSlot = 0; 403 static const int kFirstContextSlot = kUsedSlot + 1; 404 static const int kFirstContextOffset = 405 FixedArray::kHeaderSize + kFirstContextSlot * kPointerSize; 406 407 DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); 408 }; 409 410 // JSFunctions are pairs (context, function code), sometimes also called 411 // closures. A Context object is used to represent function contexts and 412 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 413 // 414 // At runtime, the contexts build a stack in parallel to the execution 415 // stack, with the top-most context being the current context. All contexts 416 // have the following slots: 417 // 418 // [ closure ] This is the current function. It is the same for all 419 // contexts inside a function. It provides access to the 420 // incoming context (i.e., the outer context, which may 421 // or may not become the current function's context), and 422 // it provides access to the functions code and thus it's 423 // scope information, which in turn contains the names of 424 // statically allocated context slots. The names are needed 425 // for dynamic lookups in the presence of 'with' or 'eval'. 426 // 427 // [ previous ] A pointer to the previous context. 428 // 429 // [ extension ] Additional data. 430 // 431 // For script contexts, it contains the respective ScopeInfo. 432 // 433 // For catch contexts, it contains a ContextExtension object 434 // consisting of the ScopeInfo and the name of the catch 435 // variable. 436 // 437 // For module contexts, it contains the module object. 438 // 439 // For block contexts, it contains either the respective 440 // ScopeInfo or a ContextExtension object consisting of the 441 // ScopeInfo and an "extension object" (see below). 442 // 443 // For with contexts, it contains a ContextExtension object 444 // consisting of the ScopeInfo and an "extension object". 445 // 446 // An "extension object" is used to dynamically extend a context 447 // with additional variables, namely in the implementation of the 448 // 'with' construct and the 'eval' construct. For instance, 449 // Context::Lookup also searches the extension object for 450 // properties. (Storing the extension object is the original 451 // purpose of this context slot, hence the name.) 452 // 453 // [ native_context ] A pointer to the native context. 454 // 455 // In addition, function contexts may have statically allocated context slots 456 // to store local variables/functions that are accessed from inner functions 457 // (via static context addresses) or through 'eval' (dynamic context lookups). 458 // The native context contains additional slots for fast access to native 459 // properties. 460 // 461 // Finally, with Harmony scoping, the JSFunction representing a top level 462 // script will have the ScriptContext rather than a FunctionContext. 463 // Script contexts from all top-level scripts are gathered in 464 // ScriptContextTable. 465 466 class Context: public FixedArray { 467 public: 468 // Conversions. 469 static inline Context* cast(Object* context); 470 471 // The default context slot layout; indices are FixedArray slot indices. 472 enum Field { 473 // These slots are in all contexts. 474 CLOSURE_INDEX, 475 PREVIOUS_INDEX, 476 // The extension slot is used for either the global object (in native 477 // contexts), eval extension object (function contexts), subject of with 478 // (with contexts), or the variable name (catch contexts), the serialized 479 // scope info (block contexts), or the module instance (module contexts). 480 EXTENSION_INDEX, 481 NATIVE_CONTEXT_INDEX, 482 483 // These slots are only in native contexts. 484 #define NATIVE_CONTEXT_SLOT(index, type, name) index, 485 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT) 486 #undef NATIVE_CONTEXT_SLOT 487 488 // Properties from here are treated as weak references by the full GC. 489 // Scavenge treats them as strong references. 490 OPTIMIZED_FUNCTIONS_LIST, // Weak. 491 OPTIMIZED_CODE_LIST, // Weak. 492 DEOPTIMIZED_CODE_LIST, // Weak. 493 NEXT_CONTEXT_LINK, // Weak. 494 495 // Total number of slots. 496 NATIVE_CONTEXT_SLOTS, 497 FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST, 498 FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, 499 500 MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX, 501 // This slot holds the thrown value in catch contexts. 502 THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 503 504 // These slots hold values in debug evaluate contexts. 505 WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS, 506 WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1 507 }; 508 509 void ResetErrorsThrown(); 510 void IncrementErrorsThrown(); 511 int GetErrorsThrown(); 512 513 // Direct slot access. 514 inline JSFunction* closure(); 515 inline void set_closure(JSFunction* closure); 516 517 inline Context* previous(); 518 inline void set_previous(Context* context); 519 520 inline Object* next_context_link(); 521 522 inline bool has_extension(); 523 inline HeapObject* extension(); 524 inline void set_extension(HeapObject* object); 525 JSObject* extension_object(); 526 JSReceiver* extension_receiver(); 527 ScopeInfo* scope_info(); 528 String* catch_name(); 529 530 // Find the module context (assuming there is one) and return the associated 531 // module object. 532 Module* module(); 533 534 // Get the context where var declarations will be hoisted to, which 535 // may be the context itself. 536 Context* declaration_context(); 537 bool is_declaration_context(); 538 539 // Get the next closure's context on the context chain. 540 Context* closure_context(); 541 542 // Returns a JSGlobalProxy object or null. 543 JSObject* global_proxy(); 544 void set_global_proxy(JSObject* global); 545 546 // Get the JSGlobalObject object. 547 V8_EXPORT_PRIVATE JSGlobalObject* global_object(); 548 549 // Get the script context by traversing the context chain. 550 Context* script_context(); 551 552 // Compute the native context. 553 inline Context* native_context(); 554 inline void set_native_context(Context* context); 555 556 // Predicates for context types. IsNativeContext is also defined on Object 557 // because we frequently have to know if arbitrary objects are natives 558 // contexts. 559 inline bool IsNativeContext(); 560 inline bool IsFunctionContext(); 561 inline bool IsCatchContext(); 562 inline bool IsWithContext(); 563 inline bool IsDebugEvaluateContext(); 564 inline bool IsBlockContext(); 565 inline bool IsModuleContext(); 566 inline bool IsEvalContext(); 567 inline bool IsScriptContext(); 568 569 inline bool HasSameSecurityTokenAs(Context* that); 570 571 // Removes a specific optimized code object from the optimized code map. 572 // In case of non-OSR the code reference is cleared from the cache entry but 573 // the entry itself is left in the map in order to proceed sharing literals. 574 void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason); 575 576 // Clear optimized code map. 577 void ClearOptimizedCodeMap(); 578 579 // A native context keeps track of all osrd optimized functions. 580 inline bool OptimizedCodeMapIsCleared(); 581 Code* SearchOptimizedCodeMap(SharedFunctionInfo* shared, 582 BailoutId osr_ast_id); 583 int SearchOptimizedCodeMapEntry(SharedFunctionInfo* shared, 584 BailoutId osr_ast_id); 585 586 static void AddToOptimizedCodeMap(Handle<Context> native_context, 587 Handle<SharedFunctionInfo> shared, 588 Handle<Code> code, 589 BailoutId osr_ast_id); 590 591 // A native context holds a list of all functions with optimized code. 592 void AddOptimizedFunction(JSFunction* function); 593 void RemoveOptimizedFunction(JSFunction* function); 594 void SetOptimizedFunctionsListHead(Object* head); 595 Object* OptimizedFunctionsListHead(); 596 597 // The native context also stores a list of all optimized code and a 598 // list of all deoptimized code, which are needed by the deoptimizer. 599 void AddOptimizedCode(Code* code); 600 void SetOptimizedCodeListHead(Object* head); 601 Object* OptimizedCodeListHead(); 602 void SetDeoptimizedCodeListHead(Object* head); 603 Object* DeoptimizedCodeListHead(); 604 605 Handle<Object> ErrorMessageForCodeGenerationFromStrings(); 606 607 static int ImportedFieldIndexForName(Handle<String> name); 608 static int IntrinsicIndexForName(Handle<String> name); 609 static int IntrinsicIndexForName(const unsigned char* name, int length); 610 611 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 612 inline void set_##name(type* value); \ 613 inline bool is_##name(type* value); \ 614 inline type* name(); 615 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 616 #undef NATIVE_CONTEXT_FIELD_ACCESSORS 617 618 // Lookup the slot called name, starting with the current context. 619 // There are three possibilities: 620 // 621 // 1) result->IsContext(): 622 // The binding was found in a context. *index is always the 623 // non-negative slot index. *attributes is NONE for var and let 624 // declarations, READ_ONLY for const declarations (never ABSENT). 625 // 626 // 2) result->IsJSObject(): 627 // The binding was found as a named property in a context extension 628 // object (i.e., was introduced via eval), as a property on the subject 629 // of with, or as a property of the global object. *index is -1 and 630 // *attributes is not ABSENT. 631 // 632 // 3) result.is_null(): 633 // There was no binding found, *index is always -1 and *attributes is 634 // always ABSENT. 635 Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags, 636 int* index, PropertyAttributes* attributes, 637 InitializationFlag* init_flag, 638 VariableMode* variable_mode); 639 640 // Code generation support. 641 static int SlotOffset(int index) { 642 return kHeaderSize + index * kPointerSize - kHeapObjectTag; 643 } 644 645 static int FunctionMapIndex(LanguageMode language_mode, FunctionKind kind) { 646 // Note: Must be kept in sync with the FastNewClosure builtin. 647 if (IsGeneratorFunction(kind)) { 648 return GENERATOR_FUNCTION_MAP_INDEX; 649 } 650 651 if (IsAsyncFunction(kind)) { 652 return ASYNC_FUNCTION_MAP_INDEX; 653 } 654 655 if (IsClassConstructor(kind)) { 656 // Like the strict function map, but with no 'name' accessor. 'name' 657 // needs to be the last property and it is added during instantiation, 658 // in case a static property with the same name exists" 659 return CLASS_FUNCTION_MAP_INDEX; 660 } 661 662 if (IsArrowFunction(kind) || IsConciseMethod(kind) || 663 IsAccessorFunction(kind)) { 664 return STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; 665 } 666 667 return is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX 668 : SLOPPY_FUNCTION_MAP_INDEX; 669 } 670 671 static int ArrayMapIndex(ElementsKind elements_kind) { 672 DCHECK(IsFastElementsKind(elements_kind)); 673 return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; 674 } 675 676 static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; 677 static const int kNotFound = -1; 678 679 // GC support. 680 typedef FixedBodyDescriptor< 681 kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; 682 683 typedef FixedBodyDescriptor< 684 kHeaderSize, 685 kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, 686 kSize> MarkCompactBodyDescriptor; 687 688 private: 689 #ifdef DEBUG 690 // Bootstrapping-aware type checks. 691 V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate, 692 Object* object); 693 static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); 694 #endif 695 696 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 697 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 698 }; 699 700 typedef Context::Field ContextField; 701 702 } // namespace internal 703 } // namespace v8 704 705 #endif // V8_CONTEXTS_H_ 706
