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 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 LEXICAL_TEST = 24 FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT, 25 }; 26 27 28 // Heap-allocated activation contexts. 29 // 30 // Contexts are implemented as FixedArray objects; the Context 31 // class is a convenience interface casted on a FixedArray object. 32 // 33 // Note: Context must have no virtual functions and Context objects 34 // must always be allocated via Heap::AllocateContext() or 35 // Factory::NewContext. 36 37 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 38 V(IS_ARRAYLIKE, JSFunction, is_arraylike) \ 39 V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \ 40 V(GET_TEMPLATE_CALL_SITE_INDEX, JSFunction, get_template_call_site) \ 41 V(MAKE_ERROR_INDEX, JSFunction, make_error) \ 42 V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ 43 V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \ 44 V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ 45 V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \ 46 V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ 47 V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ 48 V(OBJECT_FREEZE, JSFunction, object_freeze) \ 49 V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \ 50 V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \ 51 V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \ 52 V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \ 53 V(OBJECT_KEYS, JSFunction, object_keys) \ 54 V(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match) \ 55 V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \ 56 V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \ 57 V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \ 58 V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \ 59 V(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments) \ 60 V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable) \ 61 V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ 62 V(MATH_POW_INDEX, JSFunction, math_pow) \ 63 V(CREATE_RESOLVING_FUNCTION_INDEX, JSFunction, create_resolving_functions) 64 65 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 66 V(ARRAY_CONCAT_INDEX, JSFunction, array_concat) \ 67 V(ARRAY_POP_INDEX, JSFunction, array_pop) \ 68 V(ARRAY_PUSH_INDEX, JSFunction, array_push) \ 69 V(ARRAY_SHIFT_INDEX, JSFunction, array_shift) \ 70 V(ARRAY_SPLICE_INDEX, JSFunction, array_splice) \ 71 V(ARRAY_SLICE_INDEX, JSFunction, array_slice) \ 72 V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift) \ 73 V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ 74 V(ASYNC_FUNCTION_AWAIT_CAUGHT_INDEX, JSFunction, \ 75 async_function_await_caught) \ 76 V(ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX, JSFunction, \ 77 async_function_await_uncaught) \ 78 V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \ 79 async_function_promise_create) \ 80 V(ASYNC_FUNCTION_PROMISE_RELEASE_INDEX, JSFunction, \ 81 async_function_promise_release) \ 82 V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ 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(MAP_DELETE_METHOD_INDEX, JSFunction, map_delete) \ 88 V(MAP_GET_METHOD_INDEX, JSFunction, map_get) \ 89 V(MAP_HAS_METHOD_INDEX, JSFunction, map_has) \ 90 V(MAP_SET_METHOD_INDEX, JSFunction, map_set) \ 91 V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \ 92 V(OBJECT_VALUE_OF, JSFunction, object_value_of) \ 93 V(OBJECT_TO_STRING, JSFunction, object_to_string) \ 94 V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ 95 V(PROMISE_CREATE_INDEX, JSFunction, promise_create) \ 96 V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ 97 V(PROMISE_HANDLE_INDEX, JSFunction, promise_handle) \ 98 V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction, \ 99 promise_has_user_defined_reject_handler) \ 100 V(PROMISE_DEBUG_GET_INFO_INDEX, JSFunction, promise_debug_get_info) \ 101 V(PROMISE_REJECT_INDEX, JSFunction, promise_reject) \ 102 V(PROMISE_INTERNAL_REJECT_INDEX, JSFunction, promise_internal_reject) \ 103 V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \ 104 V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ 105 V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ 106 V(REJECT_PROMISE_NO_DEBUG_EVENT_INDEX, JSFunction, \ 107 reject_promise_no_debug_event) \ 108 V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ 109 V(SET_ADD_METHOD_INDEX, JSFunction, set_add) \ 110 V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete) \ 111 V(SET_HAS_METHOD_INDEX, JSFunction, set_has) \ 112 V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \ 113 V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \ 114 V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \ 115 V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \ 116 wasm_compile_error_function) \ 117 V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, wasm_runtime_error_function) 118 119 #define NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(V) \ 120 V(TYPED_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, typed_array_key_iterator_map) \ 121 V(FAST_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, fast_array_key_iterator_map) \ 122 V(GENERIC_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, array_key_iterator_map) \ 123 \ 124 V(UINT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 125 uint8_array_key_value_iterator_map) \ 126 V(INT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 127 int8_array_key_value_iterator_map) \ 128 V(UINT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 129 uint16_array_key_value_iterator_map) \ 130 V(INT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 131 int16_array_key_value_iterator_map) \ 132 V(UINT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 133 uint32_array_key_value_iterator_map) \ 134 V(INT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 135 int32_array_key_value_iterator_map) \ 136 V(FLOAT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 137 float32_array_key_value_iterator_map) \ 138 V(FLOAT64_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 139 float64_array_key_value_iterator_map) \ 140 V(UINT8_CLAMPED_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 141 uint8_clamped_array_key_value_iterator_map) \ 142 \ 143 V(FAST_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 144 fast_smi_array_key_value_iterator_map) \ 145 V(FAST_HOLEY_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 146 fast_holey_smi_array_key_value_iterator_map) \ 147 V(FAST_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 148 fast_array_key_value_iterator_map) \ 149 V(FAST_HOLEY_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 150 fast_holey_array_key_value_iterator_map) \ 151 V(FAST_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 152 fast_double_array_key_value_iterator_map) \ 153 V(FAST_HOLEY_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 154 fast_holey_double_array_key_value_iterator_map) \ 155 V(GENERIC_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \ 156 array_key_value_iterator_map) \ 157 \ 158 V(UINT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, uint8_array_value_iterator_map) \ 159 V(INT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int8_array_value_iterator_map) \ 160 V(UINT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 161 uint16_array_value_iterator_map) \ 162 V(INT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int16_array_value_iterator_map) \ 163 V(UINT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 164 uint32_array_value_iterator_map) \ 165 V(INT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int32_array_value_iterator_map) \ 166 V(FLOAT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 167 float32_array_value_iterator_map) \ 168 V(FLOAT64_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 169 float64_array_value_iterator_map) \ 170 V(UINT8_CLAMPED_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 171 uint8_clamped_array_value_iterator_map) \ 172 \ 173 V(FAST_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 174 fast_smi_array_value_iterator_map) \ 175 V(FAST_HOLEY_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 176 fast_holey_smi_array_value_iterator_map) \ 177 V(FAST_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, fast_array_value_iterator_map) \ 178 V(FAST_HOLEY_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 179 fast_holey_array_value_iterator_map) \ 180 V(FAST_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 181 fast_double_array_value_iterator_map) \ 182 V(FAST_HOLEY_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \ 183 fast_holey_double_array_value_iterator_map) \ 184 V(GENERIC_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, array_value_iterator_map) 185 186 #define NATIVE_CONTEXT_FIELDS(V) \ 187 V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ 188 V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ 189 /* Below is alpha-sorted */ \ 190 V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \ 191 accessor_property_descriptor_map) \ 192 V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 193 V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ 194 V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \ 195 V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 196 V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ 197 V(BOOL16X8_FUNCTION_INDEX, JSFunction, bool16x8_function) \ 198 V(BOOL32X4_FUNCTION_INDEX, JSFunction, bool32x4_function) \ 199 V(BOOL8X16_FUNCTION_INDEX, JSFunction, bool8x16_function) \ 200 V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 201 V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \ 202 bound_function_with_constructor_map) \ 203 V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \ 204 bound_function_without_constructor_map) \ 205 V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 206 call_as_constructor_delegate) \ 207 V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 208 V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \ 209 V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 210 V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \ 211 V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ 212 V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 213 V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ 214 error_message_for_code_gen_from_strings) \ 215 V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \ 216 V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \ 217 V(EXTRAS_UTILS_OBJECT_INDEX, JSObject, extras_utils_object) \ 218 V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ 219 V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ 220 V(FLOAT32X4_FUNCTION_INDEX, JSFunction, float32x4_function) \ 221 V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ 222 V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \ 223 fast_template_instantiations_cache) \ 224 V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, UnseededNumberDictionary, \ 225 slow_template_instantiations_cache) \ 226 V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \ 227 V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ 228 generator_function_function) \ 229 V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ 230 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \ 231 initial_array_iterator_prototype) \ 232 V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \ 233 initial_array_iterator_prototype_map) \ 234 V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ 235 V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ 236 V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \ 237 V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 238 V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ 239 V(INT16X8_FUNCTION_INDEX, JSFunction, int16x8_function) \ 240 V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ 241 V(INT32X4_FUNCTION_INDEX, JSFunction, int32x4_function) \ 242 V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ 243 V(INT8X16_FUNCTION_INDEX, JSFunction, int8x16_function) \ 244 V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 245 V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ 246 V(JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, Map, \ 247 js_array_fast_smi_elements_map_index) \ 248 V(JS_ARRAY_FAST_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ 249 js_array_fast_holey_smi_elements_map_index) \ 250 V(JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, Map, js_array_fast_elements_map_index) \ 251 V(JS_ARRAY_FAST_HOLEY_ELEMENTS_MAP_INDEX, Map, \ 252 js_array_fast_holey_elements_map_index) \ 253 V(JS_ARRAY_FAST_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 254 js_array_fast_double_elements_map_index) \ 255 V(JS_ARRAY_FAST_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ 256 js_array_fast_holey_double_elements_map_index) \ 257 V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ 258 V(JS_MAP_MAP_INDEX, Map, js_map_map) \ 259 V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \ 260 V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ 261 V(JS_SET_MAP_INDEX, Map, js_set_map) \ 262 V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ 263 V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ 264 V(MAP_CACHE_INDEX, Object, map_cache) \ 265 V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \ 266 V(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \ 267 V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \ 268 V(MATH_RANDOM_CACHE_INDEX, Object, math_random_cache) \ 269 V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \ 270 V(NATIVES_UTILS_OBJECT_INDEX, Object, natives_utils_object) \ 271 V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ 272 V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 273 V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 274 V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \ 275 slow_object_with_null_prototype_map) \ 276 V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \ 277 V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 278 V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \ 279 V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \ 280 V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \ 281 V(PROXY_FUNCTION_MAP_INDEX, Map, proxy_function_map) \ 282 V(PROXY_MAP_INDEX, Map, proxy_map) \ 283 V(PROMISE_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ 284 promise_resolve_shared_fun) \ 285 V(PROMISE_REJECT_SHARED_FUN, SharedFunctionInfo, promise_reject_shared_fun) \ 286 V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \ 287 V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 288 V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \ 289 V(REGEXP_INTERNAL_MATCH_INFO_INDEX, RegExpMatchInfo, \ 290 regexp_internal_match_info) \ 291 V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \ 292 V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ 293 V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ 294 V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ 295 V(SECURITY_TOKEN_INDEX, Object, security_token) \ 296 V(SELF_WEAK_CELL_INDEX, WeakCell, self_weak_cell) \ 297 V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map) \ 298 V(FIXED_ARRAY_ITERATOR_MAP_INDEX, Map, fixed_array_iterator_map) \ 299 V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ 300 V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ 301 V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ 302 V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 303 sloppy_function_without_prototype_map) \ 304 V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 305 sloppy_function_with_readonly_prototype_map) \ 306 V(WASM_FUNCTION_MAP_INDEX, Map, wasm_function_map) \ 307 V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ 308 V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ 309 V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \ 310 V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \ 311 V(WASM_MODULE_SYM_INDEX, Symbol, wasm_module_sym) \ 312 V(WASM_TABLE_SYM_INDEX, Symbol, wasm_table_sym) \ 313 V(WASM_MEMORY_SYM_INDEX, Symbol, wasm_memory_sym) \ 314 V(WASM_INSTANCE_SYM_INDEX, Symbol, wasm_instance_sym) \ 315 V(SLOPPY_ASYNC_FUNCTION_MAP_INDEX, Map, sloppy_async_function_map) \ 316 V(SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, Map, sloppy_generator_function_map) \ 317 V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ 318 V(STRICT_ASYNC_FUNCTION_MAP_INDEX, Map, strict_async_function_map) \ 319 V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ 320 V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ 321 V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 322 strict_function_without_prototype_map) \ 323 V(STRICT_GENERATOR_FUNCTION_MAP_INDEX, Map, strict_generator_function_map) \ 324 V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 325 V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 326 V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ 327 V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \ 328 V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \ 329 V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ 330 V(UINT16X8_FUNCTION_INDEX, JSFunction, uint16x8_function) \ 331 V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ 332 V(UINT32X4_FUNCTION_INDEX, JSFunction, uint32x4_function) \ 333 V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ 334 V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ 335 V(UINT8X16_FUNCTION_INDEX, JSFunction, uint8x16_function) \ 336 V(CURRENT_MODULE_INDEX, Module, current_module) \ 337 NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 338 NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ 339 NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(V) 340 341 // A table of all script contexts. Every loaded top-level script with top-level 342 // lexical declarations contributes its ScriptContext into this table. 343 // 344 // The table is a fixed array, its first slot is the current used count and 345 // the subsequent slots 1..used contain ScriptContexts. 346 class ScriptContextTable : public FixedArray { 347 public: 348 // Conversions. 349 static inline ScriptContextTable* cast(Object* context); 350 351 struct LookupResult { 352 int context_index; 353 int slot_index; 354 VariableMode mode; 355 InitializationFlag init_flag; 356 MaybeAssignedFlag maybe_assigned_flag; 357 }; 358 359 inline int used() const; 360 inline void set_used(int used); 361 362 static inline Handle<Context> GetContext(Handle<ScriptContextTable> table, 363 int i); 364 365 // Lookup a variable `name` in a ScriptContextTable. 366 // If it returns true, the variable is found and `result` contains 367 // valid information about its location. 368 // If it returns false, `result` is untouched. 369 MUST_USE_RESULT 370 static bool Lookup(Handle<ScriptContextTable> table, Handle<String> name, 371 LookupResult* result); 372 373 MUST_USE_RESULT 374 static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, 375 Handle<Context> script_context); 376 GetContextOffset(int context_index)377 static int GetContextOffset(int context_index) { 378 return kFirstContextOffset + context_index * kPointerSize; 379 } 380 381 private: 382 static const int kUsedSlot = 0; 383 static const int kFirstContextSlot = kUsedSlot + 1; 384 static const int kFirstContextOffset = 385 FixedArray::kHeaderSize + kFirstContextSlot * kPointerSize; 386 387 DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); 388 }; 389 390 // JSFunctions are pairs (context, function code), sometimes also called 391 // closures. A Context object is used to represent function contexts and 392 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 393 // 394 // At runtime, the contexts build a stack in parallel to the execution 395 // stack, with the top-most context being the current context. All contexts 396 // have the following slots: 397 // 398 // [ closure ] This is the current function. It is the same for all 399 // contexts inside a function. It provides access to the 400 // incoming context (i.e., the outer context, which may 401 // or may not become the current function's context), and 402 // it provides access to the functions code and thus it's 403 // scope information, which in turn contains the names of 404 // statically allocated context slots. The names are needed 405 // for dynamic lookups in the presence of 'with' or 'eval'. 406 // 407 // [ previous ] A pointer to the previous context. 408 // 409 // [ extension ] Additional data. 410 // 411 // For script contexts, it contains the respective ScopeInfo. 412 // 413 // For catch contexts, it contains a ContextExtension object 414 // consisting of the ScopeInfo and the name of the catch 415 // variable. 416 // 417 // For module contexts, it contains the module object. 418 // 419 // For block contexts, it contains either the respective 420 // ScopeInfo or a ContextExtension object consisting of the 421 // ScopeInfo and an "extension object" (see below). 422 // 423 // For with contexts, it contains a ContextExtension object 424 // consisting of the ScopeInfo and an "extension object". 425 // 426 // An "extension object" is used to dynamically extend a context 427 // with additional variables, namely in the implementation of the 428 // 'with' construct and the 'eval' construct. For instance, 429 // Context::Lookup also searches the extension object for 430 // properties. (Storing the extension object is the original 431 // purpose of this context slot, hence the name.) 432 // 433 // [ native_context ] A pointer to the native context. 434 // 435 // In addition, function contexts may have statically allocated context slots 436 // to store local variables/functions that are accessed from inner functions 437 // (via static context addresses) or through 'eval' (dynamic context lookups). 438 // The native context contains additional slots for fast access to native 439 // properties. 440 // 441 // Finally, with Harmony scoping, the JSFunction representing a top level 442 // script will have the ScriptContext rather than a FunctionContext. 443 // Script contexts from all top-level scripts are gathered in 444 // ScriptContextTable. 445 446 class Context: public FixedArray { 447 public: 448 // Conversions. 449 static inline Context* cast(Object* context); 450 451 // The default context slot layout; indices are FixedArray slot indices. 452 enum Field { 453 // These slots are in all contexts. 454 CLOSURE_INDEX, 455 PREVIOUS_INDEX, 456 // The extension slot is used for either the global object (in native 457 // contexts), eval extension object (function contexts), subject of with 458 // (with contexts), or the variable name (catch contexts), the serialized 459 // scope info (block contexts), or the module instance (module contexts). 460 EXTENSION_INDEX, 461 NATIVE_CONTEXT_INDEX, 462 463 // These slots are only in native contexts. 464 #define NATIVE_CONTEXT_SLOT(index, type, name) index, 465 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT) 466 #undef NATIVE_CONTEXT_SLOT 467 468 // Properties from here are treated as weak references by the full GC. 469 // Scavenge treats them as strong references. 470 OPTIMIZED_FUNCTIONS_LIST, // Weak. 471 OPTIMIZED_CODE_LIST, // Weak. 472 DEOPTIMIZED_CODE_LIST, // Weak. 473 NEXT_CONTEXT_LINK, // Weak. 474 475 // Total number of slots. 476 NATIVE_CONTEXT_SLOTS, 477 FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST, 478 FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, 479 480 MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX, 481 // This slot holds the thrown value in catch contexts. 482 THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 483 484 // These slots hold values in debug evaluate contexts. 485 WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS, 486 WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1 487 }; 488 489 void IncrementErrorsThrown(); 490 int GetErrorsThrown(); 491 492 // Direct slot access. 493 inline JSFunction* closure(); 494 inline void set_closure(JSFunction* closure); 495 496 inline Context* previous(); 497 inline void set_previous(Context* context); 498 499 inline Object* next_context_link(); 500 501 inline bool has_extension(); 502 inline HeapObject* extension(); 503 inline void set_extension(HeapObject* object); 504 JSObject* extension_object(); 505 JSReceiver* extension_receiver(); 506 ScopeInfo* scope_info(); 507 String* catch_name(); 508 509 // Find the module context (assuming there is one) and return the associated 510 // module object. 511 Module* module(); 512 513 // Get the context where var declarations will be hoisted to, which 514 // may be the context itself. 515 Context* declaration_context(); 516 bool is_declaration_context(); 517 518 // Get the next closure's context on the context chain. 519 Context* closure_context(); 520 521 // Returns a JSGlobalProxy object or null. 522 JSObject* global_proxy(); 523 void set_global_proxy(JSObject* global); 524 525 // Get the JSGlobalObject object. 526 V8_EXPORT_PRIVATE JSGlobalObject* global_object(); 527 528 // Get the script context by traversing the context chain. 529 Context* script_context(); 530 531 // Compute the native context. 532 inline Context* native_context(); 533 inline void set_native_context(Context* context); 534 535 // Predicates for context types. IsNativeContext is also defined on Object 536 // because we frequently have to know if arbitrary objects are natives 537 // contexts. 538 inline bool IsNativeContext(); 539 inline bool IsFunctionContext(); 540 inline bool IsCatchContext(); 541 inline bool IsWithContext(); 542 inline bool IsDebugEvaluateContext(); 543 inline bool IsBlockContext(); 544 inline bool IsModuleContext(); 545 inline bool IsScriptContext(); 546 547 inline bool HasSameSecurityTokenAs(Context* that); 548 549 // A native context holds a list of all functions with optimized code. 550 void AddOptimizedFunction(JSFunction* function); 551 void RemoveOptimizedFunction(JSFunction* function); 552 void SetOptimizedFunctionsListHead(Object* head); 553 Object* OptimizedFunctionsListHead(); 554 555 // The native context also stores a list of all optimized code and a 556 // list of all deoptimized code, which are needed by the deoptimizer. 557 void AddOptimizedCode(Code* code); 558 void SetOptimizedCodeListHead(Object* head); 559 Object* OptimizedCodeListHead(); 560 void SetDeoptimizedCodeListHead(Object* head); 561 Object* DeoptimizedCodeListHead(); 562 563 Handle<Object> ErrorMessageForCodeGenerationFromStrings(); 564 565 static int ImportedFieldIndexForName(Handle<String> name); 566 static int IntrinsicIndexForName(Handle<String> name); 567 static int IntrinsicIndexForName(const unsigned char* name, int length); 568 569 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 570 inline void set_##name(type* value); \ 571 inline bool is_##name(type* value); \ 572 inline type* name(); 573 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 574 #undef NATIVE_CONTEXT_FIELD_ACCESSORS 575 576 // Lookup the slot called name, starting with the current context. 577 // There are three possibilities: 578 // 579 // 1) result->IsContext(): 580 // The binding was found in a context. *index is always the 581 // non-negative slot index. *attributes is NONE for var and let 582 // declarations, READ_ONLY for const declarations (never ABSENT). 583 // 584 // 2) result->IsJSObject(): 585 // The binding was found as a named property in a context extension 586 // object (i.e., was introduced via eval), as a property on the subject 587 // of with, or as a property of the global object. *index is -1 and 588 // *attributes is not ABSENT. 589 // 590 // 3) result.is_null(): 591 // There was no binding found, *index is always -1 and *attributes is 592 // always ABSENT. 593 Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags, 594 int* index, PropertyAttributes* attributes, 595 InitializationFlag* init_flag, 596 VariableMode* variable_mode); 597 598 // Code generation support. SlotOffset(int index)599 static int SlotOffset(int index) { 600 return kHeaderSize + index * kPointerSize - kHeapObjectTag; 601 } 602 FunctionMapIndex(LanguageMode language_mode,FunctionKind kind)603 static int FunctionMapIndex(LanguageMode language_mode, FunctionKind kind) { 604 // Note: Must be kept in sync with FastNewClosureStub::Generate. 605 if (IsGeneratorFunction(kind)) { 606 return is_strict(language_mode) ? STRICT_GENERATOR_FUNCTION_MAP_INDEX 607 : SLOPPY_GENERATOR_FUNCTION_MAP_INDEX; 608 } 609 610 if (IsAsyncFunction(kind)) { 611 return is_strict(language_mode) ? STRICT_ASYNC_FUNCTION_MAP_INDEX 612 : SLOPPY_ASYNC_FUNCTION_MAP_INDEX; 613 } 614 615 if (IsClassConstructor(kind)) { 616 // Use strict function map (no own "caller" / "arguments") 617 return STRICT_FUNCTION_MAP_INDEX; 618 } 619 620 if (IsArrowFunction(kind) || IsConciseMethod(kind) || 621 IsAccessorFunction(kind)) { 622 return STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; 623 } 624 625 return is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX 626 : SLOPPY_FUNCTION_MAP_INDEX; 627 } 628 ArrayMapIndex(ElementsKind elements_kind)629 static int ArrayMapIndex(ElementsKind elements_kind) { 630 DCHECK(IsFastElementsKind(elements_kind)); 631 return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; 632 } 633 634 static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; 635 static const int kNotFound = -1; 636 637 // GC support. 638 typedef FixedBodyDescriptor< 639 kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; 640 641 typedef FixedBodyDescriptor< 642 kHeaderSize, 643 kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, 644 kSize> MarkCompactBodyDescriptor; 645 646 private: 647 #ifdef DEBUG 648 // Bootstrapping-aware type checks. 649 V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate, 650 Object* object); 651 static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); 652 #endif 653 654 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 655 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 656 }; 657 658 typedef Context::Field ContextField; 659 660 } // namespace internal 661 } // namespace v8 662 663 #endif // V8_CONTEXTS_H_ 664