blob: 2285731c762dce4d4eaeecf4c9f7d26bc14f5919 [file] [log] [blame]
// 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(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match) \
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(JS_WEAK_CELL_MAP_INDEX, Map, js_weak_cell_map) \
V(JS_WEAK_FACTORY_CLEANUP_ITERATOR_MAP_INDEX, Map, \
js_weak_factory_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_INTERNAL_MATCH_INFO_INDEX, RegExpMatchInfo, \
regexp_internal_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(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 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_prototype_slot,
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_