// 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/heap/heap.h" #include "src/objects.h" namespace v8 { namespace internal { enum ContextLookupFlags { FOLLOW_CONTEXT_CHAIN = 1 << 0, FOLLOW_PROTOTYPE_CHAIN = 1 << 1, STOP_AT_DECLARATION_SCOPE = 1 << 2, SKIP_WITH_CONTEXT = 1 << 3, DONT_FOLLOW_CHAINS = 0, FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN, LEXICAL_TEST = FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT, }; // ES5 10.2 defines lexical environments with mutable and immutable bindings. // Immutable bindings have two states, initialized and uninitialized, and // their state is changed by the InitializeImmutableBinding method. The // BindingFlags enum represents information if a binding has definitely been // initialized. A mutable binding does not need to be checked and thus has // the BindingFlag BINDING_IS_INITIALIZED. // // There is one possibility for legacy immutable bindings: // * The function name of a named function literal. The binding is immediately // initialized when entering the function and thus does not need to be // checked. it gets the BindingFlag BINDING_IS_INITIALIZED. // // The harmony proposal for block scoped bindings also introduces the // uninitialized state for mutable bindings. // * A 'let' declared variable. They are initialized when evaluating the // corresponding declaration statement. They need to be checked for being // initialized and thus get the flag BINDING_CHECK_INITIALIZED. // * A 'var' declared variable. It is initialized immediately upon creation // and thus doesn't need to be checked. It gets the flag // BINDING_IS_INITIALIZED. // * Catch bound variables, function parameters and variables introduced by // function declarations are initialized immediately and do not need to be // checked. Thus they get the flag BINDING_IS_INITIALIZED. // Accessing an uninitialized binding produces a reference error. // // In V8 uninitialized bindings are set to the hole value upon creation and set // to a different value upon initialization. enum BindingFlags { BINDING_IS_INITIALIZED, BINDING_CHECK_INITIALIZED, MISSING_BINDING }; // Heap-allocated activation contexts. // // Contexts are implemented as FixedArray objects; the Context // class is a convenience interface casted on a FixedArray object. // // 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(IS_ARRAYLIKE, JSFunction, is_arraylike) \ V(GET_TEMPLATE_CALL_SITE_INDEX, JSFunction, get_template_call_site) \ V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \ V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \ V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \ V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \ V(OBJECT_FREEZE, JSFunction, object_freeze) \ 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(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments) \ V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable) \ V(MATH_EXP_INDEX, JSFunction, math_exp) \ V(MATH_FLOOR_INDEX, JSFunction, math_floor) \ V(MATH_LOG_INDEX, JSFunction, math_log) \ V(MATH_SQRT_INDEX, JSFunction, math_sqrt) #define NATIVE_CONTEXT_IMPORTED_FIELDS(V) \ V(ARRAY_CONCAT_INDEX, JSFunction, array_concat) \ V(ARRAY_POP_INDEX, JSFunction, array_pop) \ V(ARRAY_PUSH_INDEX, JSFunction, array_push) \ V(ARRAY_SHIFT_INDEX, JSFunction, array_shift) \ V(ARRAY_SPLICE_INDEX, JSFunction, array_splice) \ V(ARRAY_SLICE_INDEX, JSFunction, array_slice) \ V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift) \ V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ V(ASYNC_FUNCTION_AWAIT_INDEX, JSFunction, async_function_await) \ V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \ V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \ V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \ V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ V(MAKE_ERROR_FUNCTION_INDEX, JSFunction, make_error_function) \ V(MAP_DELETE_METHOD_INDEX, JSFunction, map_delete) \ V(MAP_GET_METHOD_INDEX, JSFunction, map_get) \ V(MAP_HAS_METHOD_INDEX, JSFunction, map_has) \ V(MAP_SET_METHOD_INDEX, JSFunction, map_set) \ V(MATH_POW_METHOD_INDEX, JSFunction, math_pow) \ V(MESSAGE_GET_COLUMN_NUMBER_INDEX, JSFunction, message_get_column_number) \ V(MESSAGE_GET_LINE_NUMBER_INDEX, JSFunction, message_get_line_number) \ V(MESSAGE_GET_SOURCE_LINE_INDEX, JSFunction, message_get_source_line) \ V(NO_SIDE_EFFECTS_TO_STRING_FUN_INDEX, JSFunction, \ no_side_effects_to_string_fun) \ V(OBJECT_VALUE_OF, JSFunction, object_value_of) \ V(OBJECT_TO_STRING, JSFunction, object_to_string) \ V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ V(PROMISE_CHAIN_INDEX, JSFunction, promise_chain) \ V(PROMISE_CREATE_INDEX, JSFunction, promise_create) \ V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \ V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction, \ promise_has_user_defined_reject_handler) \ V(PROMISE_REJECT_INDEX, JSFunction, promise_reject) \ V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \ V(PROMISE_CREATE_RESOLVED_INDEX, JSFunction, promise_create_resolved) \ V(PROMISE_CREATE_REJECTED_INDEX, JSFunction, promise_create_rejected) \ V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \ V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \ V(SET_ADD_METHOD_INDEX, JSFunction, set_add) \ V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete) \ V(SET_HAS_METHOD_INDEX, JSFunction, set_has) \ V(STACK_OVERFLOW_BOILERPLATE_INDEX, JSObject, stack_overflow_boilerplate) \ 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) #define NATIVE_CONTEXT_FIELDS(V) \ V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ V(EMBEDDER_DATA_INDEX, FixedArray, 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_FUNCTION_INDEX, JSFunction, array_function) \ V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \ V(BOOL16X8_FUNCTION_INDEX, JSFunction, bool16x8_function) \ V(BOOL32X4_FUNCTION_INDEX, JSFunction, bool32x4_function) \ V(BOOL8X16_FUNCTION_INDEX, JSFunction, bool8x16_function) \ 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(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(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, JSObject, extras_utils_object) \ V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \ V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ V(FLOAT32X4_FUNCTION_INDEX, JSFunction, float32x4_function) \ V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ V(TEMPLATE_INSTANTIATIONS_CACHE_INDEX, UnseededNumberDictionary, \ template_instantiations_cache) \ 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(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \ V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ V(INT16X8_FUNCTION_INDEX, JSFunction, int16x8_function) \ V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ V(INT32X4_FUNCTION_INDEX, JSFunction, int32x4_function) \ V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ V(INT8X16_FUNCTION_INDEX, JSFunction, int8x16_function) \ V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ V(JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, Map, \ js_array_fast_smi_elements_map_index) \ V(JS_ARRAY_FAST_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \ js_array_fast_holey_smi_elements_map_index) \ V(JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, Map, js_array_fast_elements_map_index) \ V(JS_ARRAY_FAST_HOLEY_ELEMENTS_MAP_INDEX, Map, \ js_array_fast_holey_elements_map_index) \ V(JS_ARRAY_FAST_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ js_array_fast_double_elements_map_index) \ V(JS_ARRAY_FAST_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \ js_array_fast_holey_double_elements_map_index) \ V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \ V(JS_MAP_MAP_INDEX, Map, js_map_map) \ V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \ V(JS_SET_MAP_INDEX, Map, js_set_map) \ V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \ V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \ V(MAP_CACHE_INDEX, Object, map_cache) \ V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \ V(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \ V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \ V(NATIVES_UTILS_OBJECT_INDEX, Object, natives_utils_object) \ 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_WITH_NULL_PROTOTYPE_MAP, Map, object_with_null_prototype_map) \ 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_FUNCTION_MAP_INDEX, Map, proxy_function_map) \ V(PROXY_MAP_INDEX, Map, proxy_map) \ V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \ V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ V(SECURITY_TOKEN_INDEX, Object, security_token) \ V(SELF_WEAK_CELL_INDEX, WeakCell, self_weak_cell) \ V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map) \ V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \ V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_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(WASM_FUNCTION_MAP_INDEX, Map, wasm_function_map) \ V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \ V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \ V(WASM_MODULE_SYM_INDEX, Symbol, wasm_module_sym) \ V(WASM_INSTANCE_SYM_INDEX, Symbol, wasm_instance_sym) \ V(SLOPPY_ASYNC_FUNCTION_MAP_INDEX, Map, sloppy_async_function_map) \ V(SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, Map, sloppy_generator_function_map) \ V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \ V(STRICT_ASYNC_FUNCTION_MAP_INDEX, Map, strict_async_function_map) \ V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ strict_function_without_prototype_map) \ V(STRICT_GENERATOR_FUNCTION_MAP_INDEX, Map, strict_generator_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(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(UINT16X8_FUNCTION_INDEX, JSFunction, uint16x8_function) \ V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ V(UINT32X4_FUNCTION_INDEX, JSFunction, uint32x4_function) \ V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ V(UINT8X16_FUNCTION_INDEX, JSFunction, uint8x16_function) \ NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ NATIVE_CONTEXT_IMPORTED_FIELDS(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: // Conversions. static inline ScriptContextTable* cast(Object* context); 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 GetContext(Handle table, int i); // 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. MUST_USE_RESULT static bool Lookup(Handle table, Handle name, LookupResult* result); MUST_USE_RESULT static Handle Extend(Handle table, Handle script_context); static int GetContextOffset(int context_index) { return kFirstContextOffset + context_index * kPointerSize; } private: static const int kUsedSlot = 0; static const int kFirstContextSlot = kUsedSlot + 1; static const int kFirstContextOffset = FixedArray::kHeaderSize + kFirstContextSlot * kPointerSize; DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); }; // 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: // // [ closure ] This is the current function. It is the same for all // contexts inside a function. It provides access to the // incoming context (i.e., the outer context, which may // or may not become the current function's context), and // it provides access to the functions code and thus it's // scope information, which in turn contains the names of // statically allocated context slots. The names are needed // for dynamic lookups in the presence of 'with' or 'eval'. // // [ previous ] A pointer to the previous context. It is NULL for // function contexts, and non-NULL for 'with' contexts. // Used to implement the 'with' statement. // // [ extension ] A pointer to an extension JSObject, or "the hole". Used to // implement 'with' statements and dynamic declarations // (through 'eval'). The object in a 'with' statement is // stored in the extension slot of a 'with' context. // Dynamically declared variables/functions are also added // to lazily allocated extension object. Context::Lookup // searches the extension object for properties. // For script and block contexts, contains the respective // ScopeInfo. For block contexts representing sloppy declaration // block scopes, it may also be a struct being a // SloppyBlockWithEvalContextExtension, pairing the ScopeInfo // with an extension object. // // [ global_object ] A pointer to the global object. Provided for quick // access to the global object from inside the code (since // we always have a context pointer). // // 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 FixedArray { public: // Conversions. static inline Context* cast(Object* context); // The default context slot layout; indices are FixedArray slot indices. enum { // These slots are in all contexts. CLOSURE_INDEX, PREVIOUS_INDEX, // The extension slot is used for either the global object (in native // contexts), eval extension object (function contexts), subject of with // (with contexts), or the variable name (catch contexts), the serialized // scope info (block contexts), or the module instance (module contexts). 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_FUNCTIONS_LIST, // Weak. OPTIMIZED_CODE_LIST, // Weak. DEOPTIMIZED_CODE_LIST, // Weak. NEXT_CONTEXT_LINK, // Weak. // Total number of slots. NATIVE_CONTEXT_SLOTS, FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST, FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_FAST_SMI_ELEMENTS_MAP_INDEX, 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 }; void IncrementErrorsThrown(); int GetErrorsThrown(); // Direct slot access. inline JSFunction* closure(); inline void set_closure(JSFunction* closure); 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(); String* catch_name(); // 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. JSObject* global_proxy(); void set_global_proxy(JSObject* global); // Get the JSGlobalObject object. JSGlobalObject* global_object(); // Get the script context by traversing the context chain. Context* script_context(); // Compute the native context. inline Context* native_context(); inline void set_native_context(Context* context); // Predicates for context types. IsNativeContext is also defined on Object // because we frequently have to know if arbitrary objects are natives // contexts. inline bool IsNativeContext(); inline bool IsFunctionContext(); inline bool IsCatchContext(); inline bool IsWithContext(); inline bool IsDebugEvaluateContext(); inline bool IsBlockContext(); inline bool IsModuleContext(); inline bool IsScriptContext(); inline bool HasSameSecurityTokenAs(Context* that); // Initializes global variable bindings in given script context. void InitializeGlobalSlots(); // A native context holds a list of all functions with optimized code. void AddOptimizedFunction(JSFunction* function); void RemoveOptimizedFunction(JSFunction* function); void SetOptimizedFunctionsListHead(Object* head); Object* OptimizedFunctionsListHead(); // 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 ErrorMessageForCodeGenerationFromStrings(); static int ImportedFieldIndexForName(Handle name); static int IntrinsicIndexForName(Handle name); #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ inline void set_##name(type* value); \ inline bool is_##name(type* value); \ inline type* name(); 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.is_null(): // There was no binding found, *index is always -1 and *attributes is // always ABSENT. Handle Lookup(Handle name, ContextLookupFlags flags, int* index, PropertyAttributes* attributes, BindingFlags* binding_flags); // Code generation support. static int SlotOffset(int index) { return kHeaderSize + index * kPointerSize - kHeapObjectTag; } static int FunctionMapIndex(LanguageMode language_mode, FunctionKind kind) { if (IsGeneratorFunction(kind)) { return is_strict(language_mode) ? STRICT_GENERATOR_FUNCTION_MAP_INDEX : SLOPPY_GENERATOR_FUNCTION_MAP_INDEX; } if (IsAsyncFunction(kind)) { return is_strict(language_mode) ? STRICT_ASYNC_FUNCTION_MAP_INDEX : SLOPPY_ASYNC_FUNCTION_MAP_INDEX; } if (IsClassConstructor(kind)) { // Use strict function map (no own "caller" / "arguments") return STRICT_FUNCTION_MAP_INDEX; } if (IsArrowFunction(kind) || IsConciseMethod(kind) || IsAccessorFunction(kind)) { return STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; } return is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX : SLOPPY_FUNCTION_MAP_INDEX; } static int ArrayMapIndex(ElementsKind elements_kind) { DCHECK(IsFastElementsKind(elements_kind)); return elements_kind + FIRST_JS_ARRAY_MAP_SLOT; } static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; static const int kNotFound = -1; // GC support. typedef FixedBodyDescriptor< kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; typedef FixedBodyDescriptor< kHeaderSize, kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, kSize> MarkCompactBodyDescriptor; private: #ifdef DEBUG // Bootstrapping-aware type checks. static bool IsBootstrappingOrNativeContext(Isolate* isolate, Object* object); static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); #endif STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); }; } // namespace internal } // namespace v8 #endif // V8_CONTEXTS_H_