// Copyright 2012 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_CONTEXTS_H_ #define V8_CONTEXTS_H_ #include "src/function-kind.h" #include "src/objects/fixed-array.h" // Has to be the last include (doesn't have include guards): #include "src/objects/object-macros.h" namespace v8 { namespace internal { class JSGlobalObject; class JSGlobalProxy; class MicrotaskQueue; class NativeContext; class RegExpMatchInfo; enum ContextLookupFlags { FOLLOW_CONTEXT_CHAIN = 1 << 0, FOLLOW_PROTOTYPE_CHAIN = 1 << 1, DONT_FOLLOW_CHAINS = 0, FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN, }; // Heap-allocated activation contexts. // // Contexts are implemented as FixedArray-like objects having a fixed // header with a set of common fields. // // Note: Context must have no virtual functions and Context objects // must always be allocated via Heap::AllocateContext() or // Factory::NewContext. #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \ async_function_promise_create) \ V(IS_ARRAYLIKE, JSFunction, is_arraylike) \ V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \ V(MAKE_ERROR_INDEX, JSFunction, make_error) \ V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \ V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \ V(OBJECT_CREATE, JSFunction, object_create) \ V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \ V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \ V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \ V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \ V(OBJECT_KEYS, JSFunction, object_keys) \ V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \ V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \ V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \ V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \ V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ V(MATH_POW_INDEX, JSFunction, math_pow) \ V(NEW_PROMISE_CAPABILITY_INDEX, JSFunction, new_promise_capability) \ V(PROMISE_INTERNAL_CONSTRUCTOR_INDEX, JSFunction, \ promise_internal_constructor) \ V(IS_PROMISE_INDEX, JSFunction, is_promise) \ V(PROMISE_THEN_INDEX, JSFunction, promise_then) #define NATIVE_CONTEXT_FIELDS(V) \ V(GLOBAL_PROXY_INDEX, JSGlobalProxy, global_proxy_object) \ /* TODO(ishell): Actually we store exactly EmbedderDataArray here but */ \ /* it's already UBSan-fiendly and doesn't require a star... So declare */ \ /* it as a HeapObject for now. */ \ V(EMBEDDER_DATA_INDEX, HeapObject, embedder_data) \ /* Below is alpha-sorted */ \ V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \ accessor_property_descriptor_map) \ V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \ V(ARRAY_BUFFER_NOINIT_FUN_INDEX, JSFunction, array_buffer_noinit_fun) \ V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ V(ARRAY_JOIN_STACK_INDEX, HeapObject, array_join_stack) \ V(ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX, Map, async_from_sync_iterator_map) \ V(ASYNC_FUNCTION_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ async_function_await_reject_shared_fun) \ V(ASYNC_FUNCTION_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ async_function_await_resolve_shared_fun) \ V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ V(ASYNC_FUNCTION_OBJECT_MAP_INDEX, Map, async_function_object_map) \ V(ASYNC_GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ async_generator_function_function) \ V(ASYNC_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \ async_iterator_value_unwrap_shared_fun) \ V(ASYNC_GENERATOR_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \ async_generator_await_reject_shared_fun) \ V(ASYNC_GENERATOR_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ async_generator_await_resolve_shared_fun) \ V(ASYNC_GENERATOR_YIELD_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ async_generator_yield_resolve_shared_fun) \ V(ASYNC_GENERATOR_RETURN_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ async_generator_return_resolve_shared_fun) \ V(ASYNC_GENERATOR_RETURN_CLOSED_RESOLVE_SHARED_FUN, SharedFunctionInfo, \ async_generator_return_closed_resolve_shared_fun) \ V(ASYNC_GENERATOR_RETURN_CLOSED_REJECT_SHARED_FUN, SharedFunctionInfo, \ async_generator_return_closed_reject_shared_fun) \ V(ATOMICS_OBJECT, JSObject, atomics_object) \ V(BIGINT_FUNCTION_INDEX, JSFunction, bigint_function) \ V(BIGINT64_ARRAY_FUN_INDEX, JSFunction, bigint64_array_fun) \ V(BIGUINT64_ARRAY_FUN_INDEX, JSFunction, biguint64_array_fun) \ V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \ bound_function_with_constructor_map) \ V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \ bound_function_without_constructor_map) \ V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ call_as_constructor_delegate) \ V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \ V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \ V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ V(DEBUG_CONTEXT_ID_INDEX, Object, debug_context_id) \ V(EMPTY_FUNCTION_INDEX, JSFunction, empty_function) \ V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ error_message_for_code_gen_from_strings) \ V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \ V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \ V(EXTRAS_UTILS_OBJECT_INDEX, Object, extras_utils_object) \ V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \ fast_template_instantiations_cache) \ V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \ V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \ generator_function_function) \ V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ V(ASYNC_GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, \ async_generator_object_prototype_map) \ V(INITIAL_ARRAY_ITERATOR_MAP_INDEX, Map, initial_array_iterator_map) \ V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \ initial_array_iterator_prototype) \ V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ V(INITIAL_ERROR_PROTOTYPE_INDEX, JSObject, initial_error_prototype) \ V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ V(INITIAL_ASYNC_GENERATOR_PROTOTYPE_INDEX, JSObject, \ initial_async_generator_prototype) \ V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \ V(INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX, JSObject, \ initial_map_iterator_prototype) \ V(INITIAL_MAP_PROTOTYPE_MAP_INDEX, Map, initial_map_prototype_map) \ V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ V(INITIAL_SET_ITERATOR_PROTOTYPE_INDEX, JSObject, \ initial_set_iterator_prototype) \ V(INITIAL_SET_PROTOTYPE_INDEX, JSObject, initial_set_prototype) \ V(INITIAL_SET_PROTOTYPE_MAP_INDEX, Map, initial_set_prototype_map) \ V(INITIAL_STRING_ITERATOR_MAP_INDEX, Map, initial_string_iterator_map) \ V(INITIAL_STRING_ITERATOR_PROTOTYPE_INDEX, JSObject, \ initial_string_iterator_prototype) \ V(INITIAL_STRING_PROTOTYPE_INDEX, JSObject, initial_string_prototype) \ V(INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX, Map, initial_weakmap_prototype_map) \ V(INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX, Map, initial_weakset_prototype_map) \ V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ V(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \ V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \ intl_date_time_format_function) \ V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \ intl_number_format_function) \ V(INTL_LOCALE_FUNCTION_INDEX, JSFunction, intl_locale_function) \ V(INTL_SEGMENT_ITERATOR_MAP_INDEX, Map, intl_segment_iterator_map) \ V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ V(JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, Map, \ js_array_packed_smi_elements_map) \ V(JS_ARRAY_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ js_array_holey_smi_elements_map) \ V(JS_ARRAY_PACKED_ELEMENTS_MAP_INDEX, Map, js_array_packed_elements_map) \ V(JS_ARRAY_HOLEY_ELEMENTS_MAP_INDEX, Map, js_array_holey_elements_map) \ V(JS_ARRAY_PACKED_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ js_array_packed_double_elements_map) \ V(JS_ARRAY_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ js_array_holey_double_elements_map) \ V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ V(JS_MAP_MAP_INDEX, Map, js_map_map) \ V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \ V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ V(JS_SET_MAP_INDEX, Map, js_set_map) \ V(WEAK_CELL_MAP_INDEX, Map, weak_cell_map) \ V(JS_FINALIZATION_GROUP_CLEANUP_ITERATOR_MAP_INDEX, Map, \ js_finalization_group_cleanup_iterator_map) \ V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ V(JS_WEAK_REF_MAP_INDEX, Map, js_weak_ref_map) \ V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ V(MAP_CACHE_INDEX, Object, map_cache) \ V(MAP_KEY_ITERATOR_MAP_INDEX, Map, map_key_iterator_map) \ V(MAP_KEY_VALUE_ITERATOR_MAP_INDEX, Map, map_key_value_iterator_map) \ V(MAP_VALUE_ITERATOR_MAP_INDEX, Map, map_value_iterator_map) \ V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \ V(MATH_RANDOM_STATE_INDEX, ByteArray, math_random_state) \ V(MATH_RANDOM_CACHE_INDEX, FixedDoubleArray, math_random_cache) \ V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \ V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \ V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \ V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \ V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \ V(PROXY_MAP_INDEX, Map, proxy_map) \ V(PROXY_REVOCABLE_RESULT_MAP_INDEX, Map, proxy_revocable_result_map) \ V(PROXY_REVOKE_SHARED_FUN, SharedFunctionInfo, proxy_revoke_shared_fun) \ V(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \ promise_get_capabilities_executor_shared_fun) \ V(PROMISE_CAPABILITY_DEFAULT_REJECT_SHARED_FUN_INDEX, SharedFunctionInfo, \ promise_capability_default_reject_shared_fun) \ V(PROMISE_CAPABILITY_DEFAULT_RESOLVE_SHARED_FUN_INDEX, SharedFunctionInfo, \ promise_capability_default_resolve_shared_fun) \ V(PROMISE_THEN_FINALLY_SHARED_FUN, SharedFunctionInfo, \ promise_then_finally_shared_fun) \ V(PROMISE_CATCH_FINALLY_SHARED_FUN, SharedFunctionInfo, \ promise_catch_finally_shared_fun) \ V(PROMISE_VALUE_THUNK_FINALLY_SHARED_FUN, SharedFunctionInfo, \ promise_value_thunk_finally_shared_fun) \ V(PROMISE_THROWER_FINALLY_SHARED_FUN, SharedFunctionInfo, \ promise_thrower_finally_shared_fun) \ V(PROMISE_ALL_RESOLVE_ELEMENT_SHARED_FUN, SharedFunctionInfo, \ promise_all_resolve_element_shared_fun) \ V(PROMISE_PROTOTYPE_INDEX, JSObject, promise_prototype) \ V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \ V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \ V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \ V(INITIAL_REGEXP_STRING_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \ initial_regexp_string_iterator_prototype_map) \ V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ V(REGEXP_PROTOTYPE_INDEX, JSObject, regexp_prototype) \ V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ V(SECURITY_TOKEN_INDEX, Object, security_token) \ V(SERIALIZED_OBJECTS, FixedArray, serialized_objects) \ V(SET_VALUE_ITERATOR_MAP_INDEX, Map, set_value_iterator_map) \ V(SET_KEY_VALUE_ITERATOR_MAP_INDEX, Map, set_key_value_iterator_map) \ V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \ slow_object_with_null_prototype_map) \ V(SLOW_OBJECT_WITH_OBJECT_PROTOTYPE_MAP, Map, \ slow_object_with_object_prototype_map) \ V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, SimpleNumberDictionary, \ slow_template_instantiations_cache) \ /* All *_FUNCTION_MAP_INDEX definitions used by Context::FunctionMapIndex */ \ /* must remain together. */ \ V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ V(SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX, Map, sloppy_function_with_name_map) \ V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ sloppy_function_without_prototype_map) \ V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ sloppy_function_with_readonly_prototype_map) \ V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ V(STRICT_FUNCTION_WITH_NAME_MAP_INDEX, Map, strict_function_with_name_map) \ V(STRICT_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ strict_function_with_readonly_prototype_map) \ V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ strict_function_without_prototype_map) \ V(METHOD_WITH_NAME_MAP_INDEX, Map, method_with_name_map) \ V(METHOD_WITH_HOME_OBJECT_MAP_INDEX, Map, method_with_home_object_map) \ V(METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ method_with_name_and_home_object_map) \ V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \ V(ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, Map, async_function_with_name_map) \ V(ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ async_function_with_home_object_map) \ V(ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ async_function_with_name_and_home_object_map) \ V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \ V(GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ generator_function_with_name_map) \ V(GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ generator_function_with_home_object_map) \ V(GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ generator_function_with_name_and_home_object_map) \ V(ASYNC_GENERATOR_FUNCTION_MAP_INDEX, Map, async_generator_function_map) \ V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \ async_generator_function_with_name_map) \ V(ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \ async_generator_function_with_home_object_map) \ V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \ async_generator_function_with_name_and_home_object_map) \ V(CLASS_FUNCTION_MAP_INDEX, Map, class_function_map) \ V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \ V(WASM_EXCEPTION_CONSTRUCTOR_INDEX, JSFunction, wasm_exception_constructor) \ V(WASM_GLOBAL_CONSTRUCTOR_INDEX, JSFunction, wasm_global_constructor) \ V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \ V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \ V(TEMPLATE_WEAKMAP_INDEX, HeapObject, template_weakmap) \ V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \ V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \ V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ V(ARRAY_ENTRIES_ITERATOR_INDEX, JSFunction, array_entries_iterator) \ V(ARRAY_FOR_EACH_ITERATOR_INDEX, JSFunction, array_for_each_iterator) \ V(ARRAY_KEYS_ITERATOR_INDEX, JSFunction, array_keys_iterator) \ V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \ V(ERROR_TO_STRING, JSFunction, error_to_string) \ V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \ V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ V(GLOBAL_PROXY_FUNCTION_INDEX, JSFunction, global_proxy_function) \ V(MAP_DELETE_INDEX, JSFunction, map_delete) \ V(MAP_GET_INDEX, JSFunction, map_get) \ V(MAP_HAS_INDEX, JSFunction, map_has) \ V(MAP_SET_INDEX, JSFunction, map_set) \ V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \ V(OBJECT_TO_STRING, JSFunction, object_to_string) \ V(PROMISE_ALL_INDEX, JSFunction, promise_all) \ V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ V(SET_ADD_INDEX, JSFunction, set_add) \ V(SET_DELETE_INDEX, JSFunction, set_delete) \ V(SET_HAS_INDEX, JSFunction, set_has) \ V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \ V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \ V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \ V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \ wasm_compile_error_function) \ V(WASM_LINK_ERROR_FUNCTION_INDEX, JSFunction, wasm_link_error_function) \ V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, \ wasm_runtime_error_function) \ V(WEAKMAP_SET_INDEX, JSFunction, weakmap_set) \ V(WEAKMAP_GET_INDEX, JSFunction, weakmap_get) \ V(WEAKSET_ADD_INDEX, JSFunction, weakset_add) \ NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) // A table of all script contexts. Every loaded top-level script with top-level // lexical declarations contributes its ScriptContext into this table. // // The table is a fixed array, its first slot is the current used count and // the subsequent slots 1..used contain ScriptContexts. class ScriptContextTable : public FixedArray { public: DECL_CAST(ScriptContextTable) struct LookupResult { int context_index; int slot_index; VariableMode mode; InitializationFlag init_flag; MaybeAssignedFlag maybe_assigned_flag; }; inline int used() const; inline void set_used(int used); static inline Handle<Context> GetContext(Isolate* isolate, Handle<ScriptContextTable> table, int i); inline Context get_context(int i) const; // Lookup a variable `name` in a ScriptContextTable. // If it returns true, the variable is found and `result` contains // valid information about its location. // If it returns false, `result` is untouched. V8_WARN_UNUSED_RESULT static bool Lookup(Isolate* isolate, ScriptContextTable table, String name, LookupResult* result); V8_WARN_UNUSED_RESULT static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, Handle<Context> script_context); static const int kUsedSlotIndex = 0; static const int kFirstContextSlotIndex = 1; static const int kMinLength = kFirstContextSlotIndex; OBJECT_CONSTRUCTORS(ScriptContextTable, FixedArray); }; // JSFunctions are pairs (context, function code), sometimes also called // closures. A Context object is used to represent function contexts and // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). // // At runtime, the contexts build a stack in parallel to the execution // stack, with the top-most context being the current context. All contexts // have the following slots: // // [ scope_info ] This is the scope info describing the current context. It // contains the names of statically allocated context slots, // and stack-allocated locals. The names are needed for // dynamic lookups in the presence of 'with' or 'eval', and // for the debugger. // // [ previous ] A pointer to the previous context. // // [ extension ] Additional data. // // For native contexts, it contains the global object. // For module contexts, it contains the module object. // For await contexts, it contains the generator object. // For block contexts, it may contain an "extension object". // For with contexts, it contains an "extension object". // // An "extension object" is used to dynamically extend a // context with additional variables, namely in the // implementation of the 'with' construct and the 'eval' // construct. For instance, Context::Lookup also searches // the extension object for properties. (Storing the // extension object is the original purpose of this context // slot, hence the name.) // // [ native_context ] A pointer to the native context. // // In addition, function contexts may have statically allocated context slots // to store local variables/functions that are accessed from inner functions // (via static context addresses) or through 'eval' (dynamic context lookups). // The native context contains additional slots for fast access to native // properties. // // Finally, with Harmony scoping, the JSFunction representing a top level // script will have the ScriptContext rather than a FunctionContext. // Script contexts from all top-level scripts are gathered in // ScriptContextTable. class Context : public HeapObject { public: NEVER_READ_ONLY_SPACE DECL_CAST(Context) // [length]: length of the context. V8_INLINE int length() const; V8_INLINE void set_length(int value); // Setter and getter for elements. V8_INLINE Object get(int index) const; V8_INLINE void set(int index, Object value); // Setter with explicit barrier mode. V8_INLINE void set(int index, Object value, WriteBarrierMode mode); // Layout description. #define CONTEXT_FIELDS(V) \ V(kLengthOffset, kTaggedSize) \ /* TODO(ishell): remove this fixedArray-like header size. */ \ V(kHeaderSize, 0) \ V(kStartOfTaggedFieldsOffset, 0) \ V(kStartOfStrongFieldsOffset, 0) \ /* Tagged fields. */ \ V(kScopeInfoOffset, kTaggedSize) \ V(kPreviousOffset, kTaggedSize) \ V(kExtensionOffset, kTaggedSize) \ V(kNativeContextOffset, kTaggedSize) \ /* Header size. */ \ /* TODO(ishell): use this as header size once MIN_CONTEXT_SLOTS */ \ /* is removed in favour of offset-based access to common fields. */ \ V(kTodoHeaderSize, 0) DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize, CONTEXT_FIELDS) #undef CONTEXT_FIELDS // Garbage collection support. V8_INLINE static constexpr int SizeFor(int length) { // TODO(ishell): switch to kTodoHeaderSize based approach once we no longer // reference common Context fields via index return kHeaderSize + length * kTaggedSize; } // Code Generation support. // Offset of the element from the beginning of object. V8_INLINE static constexpr int OffsetOfElementAt(int index) { return SizeFor(index); } // Offset of the element from the heap object pointer. V8_INLINE static constexpr int SlotOffset(int index) { return SizeFor(index) - kHeapObjectTag; } // TODO(ishell): eventually migrate to the offset based access instead of // index-based. // The default context slot layout; indices are FixedArray slot indices. enum Field { // TODO(shell): use offset-based approach for accessing common values. // These slots are in all contexts. SCOPE_INFO_INDEX, PREVIOUS_INDEX, EXTENSION_INDEX, NATIVE_CONTEXT_INDEX, // These slots are only in native contexts. #define NATIVE_CONTEXT_SLOT(index, type, name) index, NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT) #undef NATIVE_CONTEXT_SLOT // Properties from here are treated as weak references by the full GC. // Scavenge treats them as strong references. OPTIMIZED_CODE_LIST, // Weak. DEOPTIMIZED_CODE_LIST, // Weak. NEXT_CONTEXT_LINK, // Weak. // Total number of slots. NATIVE_CONTEXT_SLOTS, FIRST_WEAK_SLOT = OPTIMIZED_CODE_LIST, FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, // TODO(shell): Remove, once it becomes zero MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX, // This slot holds the thrown value in catch contexts. THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, // These slots hold values in debug evaluate contexts. WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS, WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1 }; // A region of native context entries containing maps for functions created // by Builtins::kFastNewClosure. static const int FIRST_FUNCTION_MAP_INDEX = SLOPPY_FUNCTION_MAP_INDEX; static const int LAST_FUNCTION_MAP_INDEX = CLASS_FUNCTION_MAP_INDEX; static const int kNoContext = 0; static const int kInvalidContext = 1; void ResetErrorsThrown(); void IncrementErrorsThrown(); int GetErrorsThrown(); // Direct slot access. inline void set_scope_info(ScopeInfo scope_info); inline Object unchecked_previous(); inline Context previous(); inline void set_previous(Context context); inline Object next_context_link(); inline bool has_extension(); inline HeapObject extension(); inline void set_extension(HeapObject object); JSObject extension_object(); JSReceiver extension_receiver(); ScopeInfo scope_info(); // Find the module context (assuming there is one) and return the associated // module object. Module module(); // Get the context where var declarations will be hoisted to, which // may be the context itself. Context declaration_context(); bool is_declaration_context(); // Get the next closure's context on the context chain. Context closure_context(); // Returns a JSGlobalProxy object or null. JSGlobalProxy global_proxy(); void set_global_proxy(JSGlobalProxy global); // Get the JSGlobalObject object. V8_EXPORT_PRIVATE JSGlobalObject global_object(); // Get the script context by traversing the context chain. Context script_context(); // Compute the native context. inline NativeContext native_context() const; inline void set_native_context(NativeContext context); // Predicates for context types. IsNativeContext is already defined on // Object. inline bool IsFunctionContext() const; inline bool IsCatchContext() const; inline bool IsWithContext() const; inline bool IsDebugEvaluateContext() const; inline bool IsAwaitContext() const; inline bool IsBlockContext() const; inline bool IsModuleContext() const; inline bool IsEvalContext() const; inline bool IsScriptContext() const; inline bool HasSameSecurityTokenAs(Context that) const; // The native context also stores a list of all optimized code and a // list of all deoptimized code, which are needed by the deoptimizer. void AddOptimizedCode(Code code); void SetOptimizedCodeListHead(Object head); Object OptimizedCodeListHead(); void SetDeoptimizedCodeListHead(Object head); Object DeoptimizedCodeListHead(); Handle<Object> ErrorMessageForCodeGenerationFromStrings(); static int IntrinsicIndexForName(Handle<String> name); static int IntrinsicIndexForName(const unsigned char* name, int length); #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ inline void set_##name(type value); \ inline bool is_##name(type value) const; \ inline type name() const; NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) #undef NATIVE_CONTEXT_FIELD_ACCESSORS // Lookup the slot called name, starting with the current context. // There are three possibilities: // // 1) result->IsContext(): // The binding was found in a context. *index is always the // non-negative slot index. *attributes is NONE for var and let // declarations, READ_ONLY for const declarations (never ABSENT). // // 2) result->IsJSObject(): // The binding was found as a named property in a context extension // object (i.e., was introduced via eval), as a property on the subject // of with, or as a property of the global object. *index is -1 and // *attributes is not ABSENT. // // 3) result->IsModule(): // The binding was found in module imports or exports. // *attributes is never ABSENT. imports are READ_ONLY. // // 4) result.is_null(): // There was no binding found, *index is always -1 and *attributes is // always ABSENT. static Handle<Object> Lookup(Handle<Context> context, Handle<String> name, ContextLookupFlags flags, int* index, PropertyAttributes* attributes, InitializationFlag* init_flag, VariableMode* variable_mode, bool* is_sloppy_function_name = nullptr); static inline int FunctionMapIndex(LanguageMode language_mode, FunctionKind kind, bool has_shared_name, bool needs_home_object); static int ArrayMapIndex(ElementsKind elements_kind) { DCHECK(IsFastElementsKind(elements_kind)); return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; } inline Map GetInitialJSArrayMap(ElementsKind kind) const; static const int kNotFound = -1; // Dispatched behavior. DECL_PRINTER(Context) DECL_VERIFIER(Context) typedef FlexibleBodyDescriptor<kStartOfTaggedFieldsOffset> BodyDescriptor; private: #ifdef DEBUG // Bootstrapping-aware type checks. V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate, Object object); static bool IsBootstrappingOrValidParentContext(Object object, Context kid); #endif OBJECT_CONSTRUCTORS(Context, HeapObject); }; class NativeContext : public Context { public: DECL_CAST(NativeContext) // TODO(neis): Move some stuff from Context here. // [microtask_queue]: pointer to the MicrotaskQueue object. DECL_PRIMITIVE_ACCESSORS(microtask_queue, MicrotaskQueue*) // Dispatched behavior. DECL_PRINTER(NativeContext) DECL_VERIFIER(NativeContext) // Layout description. #define NATIVE_CONTEXT_FIELDS_DEF(V) \ /* TODO(ishell): move definition of common context offsets to Context. */ \ V(kStartOfNativeContextFieldsOffset, \ (FIRST_WEAK_SLOT - MIN_CONTEXT_SLOTS) * kTaggedSize) \ V(kEndOfStrongFieldsOffset, 0) \ V(kStartOfWeakFieldsOffset, \ (NATIVE_CONTEXT_SLOTS - FIRST_WEAK_SLOT) * kTaggedSize) \ V(kEndOfWeakFieldsOffset, 0) \ V(kEndOfNativeContextFieldsOffset, 0) \ V(kEndOfTaggedFieldsOffset, 0) \ /* Raw data. */ \ V(kMicrotaskQueueOffset, kSystemPointerSize) \ /* Total size. */ \ V(kSize, 0) DEFINE_FIELD_OFFSET_CONSTANTS(Context::kTodoHeaderSize, NATIVE_CONTEXT_FIELDS_DEF) #undef NATIVE_CONTEXT_FIELDS_DEF class BodyDescriptor; private: STATIC_ASSERT(OffsetOfElementAt(EMBEDDER_DATA_INDEX) == Internals::kNativeContextEmbedderDataOffset); OBJECT_CONSTRUCTORS(NativeContext, Context); }; typedef Context::Field ContextField; } // namespace internal } // namespace v8 #include "src/objects/object-macros-undef.h" #endif // V8_CONTEXTS_H_