/
contexts.h
803 lines (714 loc) · 44.1 KB
/
contexts.h
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// 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_OBJECTS_CONTEXTS_H_
#define V8_OBJECTS_CONTEXTS_H_
#include "include/v8-promise.h"
#include "src/objects/fixed-array.h"
#include "src/objects/function-kind.h"
#include "src/objects/ordered-hash-table.h"
#include "src/objects/osr-optimized-code-cache.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(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \
V(ASYNC_MODULE_EVALUATE_INTERNAL, JSFunction, \
async_module_evaluate_internal) \
V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \
V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \
V(PROMISE_THEN_INDEX, JSFunction, promise_then) \
V(FUNCTION_PROTOTYPE_APPLY_INDEX, JSFunction, function_prototype_apply)
#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) \
V(CONTINUATION_PRESERVED_EMBEDDER_DATA_INDEX, HeapObject, \
continuation_preserved_embedder_data) \
NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \
/* TypedArray constructors - these must stay in order! */ \
V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \
V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \
V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \
V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \
V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \
V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \
V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \
V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \
V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \
V(BIGUINT64_ARRAY_FUN_INDEX, JSFunction, biguint64_array_fun) \
V(BIGINT64_ARRAY_FUN_INDEX, JSFunction, bigint64_array_fun) \
V(RAB_GSAB_UINT8_ARRAY_MAP_INDEX, Map, rab_gsab_uint8_array_map) \
V(RAB_GSAB_INT8_ARRAY_MAP_INDEX, Map, rab_gsab_int8_array_map) \
V(RAB_GSAB_UINT16_ARRAY_MAP_INDEX, Map, rab_gsab_uint16_array_map) \
V(RAB_GSAB_INT16_ARRAY_MAP_INDEX, Map, rab_gsab_int16_array_map) \
V(RAB_GSAB_UINT32_ARRAY_MAP_INDEX, Map, rab_gsab_uint32_array_map) \
V(RAB_GSAB_INT32_ARRAY_MAP_INDEX, Map, rab_gsab_int32_array_map) \
V(RAB_GSAB_FLOAT32_ARRAY_MAP_INDEX, Map, rab_gsab_float32_array_map) \
V(RAB_GSAB_FLOAT64_ARRAY_MAP_INDEX, Map, rab_gsab_float64_array_map) \
V(RAB_GSAB_UINT8_CLAMPED_ARRAY_MAP_INDEX, Map, \
rab_gsab_uint8_clamped_array_map) \
V(RAB_GSAB_BIGUINT64_ARRAY_MAP_INDEX, Map, rab_gsab_biguint64_array_map) \
V(RAB_GSAB_BIGINT64_ARRAY_MAP_INDEX, Map, rab_gsab_bigint64_array_map) \
/* 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_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(ATOMICS_OBJECT, JSObject, atomics_object) \
V(BIGINT_FUNCTION_INDEX, JSFunction, bigint_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(CALL_ASYNC_MODULE_FULFILLED, JSFunction, call_async_module_fulfilled) \
V(CALL_ASYNC_MODULE_REJECTED, JSFunction, call_async_module_rejected) \
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_BINDING_OBJECT_INDEX, JSObject, extras_binding_object) \
V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \
V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \
fast_template_instantiations_cache) \
V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \
V(FUNCTION_PROTOTYPE_INDEX, JSObject, function_prototype) \
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_ITERATOR_PROTOTYPE_INDEX, JSObject, \
initial_async_iterator_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(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \
V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \
intl_date_time_format_function) \
V(INTL_DISPLAY_NAMES_FUNCTION_INDEX, JSFunction, \
intl_display_names_function) \
V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \
intl_number_format_function) \
V(INTL_LOCALE_FUNCTION_INDEX, JSFunction, intl_locale_function) \
V(INTL_LIST_FORMAT_FUNCTION_INDEX, JSFunction, intl_list_format_function) \
V(INTL_PLURAL_RULES_FUNCTION_INDEX, JSFunction, intl_plural_rules_function) \
V(INTL_RELATIVE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \
intl_relative_time_format_function) \
V(INTL_SEGMENTER_FUNCTION_INDEX, JSFunction, intl_segmenter_function) \
V(INTL_SEGMENTS_MAP_INDEX, Map, intl_segments_map) \
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_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \
V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \
V(JS_WEAK_REF_FUNCTION_INDEX, JSFunction, js_weak_ref_fun) \
V(JS_FINALIZATION_REGISTRY_FUNCTION_INDEX, JSFunction, \
js_finalization_registry_fun) \
V(JS_TEMPORAL_CALENDAR_FUNCTION_INDEX, JSFunction, \
temporal_calendar_function) \
V(JS_TEMPORAL_DURATION_FUNCTION_INDEX, JSFunction, \
temporal_duration_function) \
V(JS_TEMPORAL_INSTANT_FUNCTION_INDEX, JSFunction, temporal_instant_function) \
V(JS_TEMPORAL_PLAIN_DATE_FUNCTION_INDEX, JSFunction, \
temporal_plain_date_function) \
V(JS_TEMPORAL_PLAIN_DATE_TIME_FUNCTION_INDEX, JSFunction, \
temporal_plain_date_time_function) \
V(JS_TEMPORAL_PLAIN_MONTH_DAY_FUNCTION_INDEX, JSFunction, \
temporal_plain_month_day_function) \
V(JS_TEMPORAL_PLAIN_TIME_FUNCTION_INDEX, JSFunction, \
temporal_plain_time_function) \
V(JS_TEMPORAL_PLAIN_YEAR_MONTH_FUNCTION_INDEX, JSFunction, \
temporal_plain_year_month_function) \
V(JS_TEMPORAL_TIME_ZONE_FUNCTION_INDEX, JSFunction, \
temporal_time_zone_function) \
V(JS_TEMPORAL_ZONED_DATE_TIME_FUNCTION_INDEX, JSFunction, \
temporal_zoned_date_time_function) \
V(TEMPORAL_INSTANT_FIXED_ARRAY_FROM_ITERABLE_FUNCTION_INDEX, JSFunction, \
temporal_instant_fixed_array_from_iterable) \
V(STRING_FIXED_ARRAY_FROM_ITERABLE_FUNCTION_INDEX, JSFunction, \
string_fixed_array_from_iterable) \
/* Context maps */ \
V(NATIVE_CONTEXT_MAP_INDEX, Map, native_context_map) \
V(FUNCTION_CONTEXT_MAP_INDEX, Map, function_context_map) \
V(MODULE_CONTEXT_MAP_INDEX, Map, module_context_map) \
V(EVAL_CONTEXT_MAP_INDEX, Map, eval_context_map) \
V(SCRIPT_CONTEXT_MAP_INDEX, Map, script_context_map) \
V(AWAIT_CONTEXT_MAP_INDEX, Map, await_context_map) \
V(BLOCK_CONTEXT_MAP_INDEX, Map, block_context_map) \
V(CATCH_CONTEXT_MAP_INDEX, Map, catch_context_map) \
V(WITH_CONTEXT_MAP_INDEX, Map, with_context_map) \
V(DEBUG_EVALUATE_CONTEXT_MAP_INDEX, Map, debug_evaluate_context_map) \
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_INDEX, JSObject, object_function_prototype) \
V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \
V(PROMISE_HOOK_INIT_FUNCTION_INDEX, Object, promise_hook_init_function) \
V(PROMISE_HOOK_BEFORE_FUNCTION_INDEX, Object, promise_hook_before_function) \
V(PROMISE_HOOK_AFTER_FUNCTION_INDEX, Object, promise_hook_after_function) \
V(PROMISE_HOOK_RESOLVE_FUNCTION_INDEX, Object, \
promise_hook_resolve_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(PROMISE_PROTOTYPE_INDEX, JSObject, promise_prototype) \
V(RECORDER_CONTEXT_ID, Object, recorder_context_id) \
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_MATCH_ALL_FUNCTION_INDEX, JSFunction, regexp_match_all_function) \
V(REGEXP_MATCH_FUNCTION_INDEX, JSFunction, regexp_match_function) \
V(REGEXP_PROTOTYPE_INDEX, JSObject, regexp_prototype) \
V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \
V(REGEXP_REPLACE_FUNCTION_INDEX, JSFunction, regexp_replace_function) \
V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \
V(REGEXP_RESULT_WITH_INDICES_MAP_INDEX, Map, regexp_result_with_indices_map) \
V(REGEXP_RESULT_INDICES_MAP_INDEX, Map, regexp_result_indices_map) \
V(REGEXP_SEARCH_FUNCTION_INDEX, JSFunction, regexp_search_function) \
V(REGEXP_SPLIT_FUNCTION_INDEX, JSFunction, regexp_split_function) \
V(INITIAL_REGEXP_STRING_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \
initial_regexp_string_iterator_prototype_map) \
V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \
V(SCRIPT_EXECUTION_CALLBACK_INDEX, Object, script_execution_callback) \
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) \
V(ATOMICS_WAITASYNC_PROMISES, OrderedHashSet, atomics_waitasync_promises) \
V(WASM_DEBUG_MAPS, FixedArray, wasm_debug_maps) \
/* Fast Path Protectors */ \
V(REGEXP_SPECIES_PROTECTOR_INDEX, PropertyCell, regexp_species_protector) \
/* 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(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \
V(ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, Map, async_function_with_name_map) \
V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \
V(GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \
generator_function_with_name_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(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(WASM_EXPORTED_FUNCTION_MAP_INDEX, Map, wasm_exported_function_map) \
V(WASM_TAG_CONSTRUCTOR_INDEX, JSFunction, wasm_tag_constructor) \
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(WASM_SUSPENDER_CONSTRUCTOR_INDEX, JSFunction, wasm_suspender_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(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(AGGREGATE_ERROR_FUNCTION_INDEX, JSFunction, aggregate_error_function) \
V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \
V(GLOBAL_PARSE_FLOAT_FUN_INDEX, JSFunction, global_parse_float_fun) \
V(GLOBAL_PARSE_INT_FUN_INDEX, JSFunction, global_parse_int_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(FINALIZATION_REGISTRY_CLEANUP_SOME, JSFunction, \
finalization_registry_cleanup_some) \
V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \
V(FUNCTION_TO_STRING_INDEX, JSFunction, function_to_string) \
V(OBJECT_TO_STRING, JSFunction, object_to_string) \
V(OBJECT_VALUE_OF_FUNCTION_INDEX, JSFunction, object_value_of_function) \
V(PROMISE_ALL_INDEX, JSFunction, promise_all) \
V(PROMISE_ALL_SETTLED_INDEX, JSFunction, promise_all_settled) \
V(PROMISE_ANY_INDEX, JSFunction, promise_any) \
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(WASM_EXCEPTION_ERROR_FUNCTION_INDEX, JSFunction, \
wasm_exception_error_function) \
V(WEAKMAP_SET_INDEX, JSFunction, weakmap_set) \
V(WEAKMAP_GET_INDEX, JSFunction, weakmap_get) \
V(WEAKMAP_DELETE_INDEX, JSFunction, weakmap_delete) \
V(WEAKSET_ADD_INDEX, JSFunction, weakset_add) \
V(WRAPPED_FUNCTION_MAP_INDEX, Map, wrapped_function_map) \
V(RETAINED_MAPS, Object, retained_maps) \
V(OSR_CODE_CACHE_INDEX, OSROptimizedCodeCache, osr_code_cache)
#include "torque-generated/src/objects/contexts-tq.inc"
// 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.
struct VariableLookupResult;
class ScriptContextTable : public FixedArray {
public:
DECL_CAST(ScriptContextTable)
DECL_RELEASE_ACQUIRE_INT_ACCESSORS(used)
static inline Handle<Context> GetContext(Isolate* isolate,
Handle<ScriptContextTable> table,
int i);
inline Context get_context(int i) const;
inline Context get_context(int i, AcquireLoadTag tag) const;
DECL_ACCESSORS(names_to_context_index, NameToIndexHashTable)
// Adds local names from `script_context` to the hash table.
static void AddLocalNamesFromContext(
Isolate* isolate, Handle<ScriptContextTable> script_context_table,
Handle<Context> script_context, bool ignore_duplicates,
int script_context_index);
// 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
V8_EXPORT_PRIVATE bool Lookup(Handle<String> name,
VariableLookupResult* result);
V8_WARN_UNUSED_RESULT
V8_EXPORT_PRIVATE static Handle<ScriptContextTable> Extend(
Isolate* isolate, Handle<ScriptContextTable> table,
Handle<Context> script_context, bool ignore_duplicates = false);
static const int kHashTableIndex = 0;
static const int kUsedSlotIndex = 1;
static const int kFirstContextSlotIndex = 2;
static const int kMinLength = kFirstContextSlotIndex;
static const int kHashTableOffset = OffsetOfElementAt(kHashTableIndex);
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. This slot is only available when
// ScopeInfo::HasContextExtensionSlot returns true.
//
// 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 var 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.)
//
// In addition, function contexts with sloppy eval 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 TorqueGeneratedContext<Context, HeapObject> {
public:
NEVER_READ_ONLY_SPACE
using TorqueGeneratedContext::length; // Non-atomic.
using TorqueGeneratedContext::set_length; // Non-atomic.
DECL_RELAXED_SMI_ACCESSORS(length)
// Setter and getter for elements.
// Note the plain accessors use relaxed semantics.
// TODO(jgruber): Make that explicit through tags.
V8_INLINE Object get(int index) const;
V8_INLINE Object get(PtrComprCageBase cage_base, int index) const;
V8_INLINE void set(int index, Object value,
WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
// Accessors with acquire-release semantics.
V8_INLINE Object get(int index, AcquireLoadTag) const;
V8_INLINE Object get(PtrComprCageBase cage_base, int index,
AcquireLoadTag) const;
V8_INLINE void set(int index, Object value, WriteBarrierMode mode,
ReleaseStoreTag);
static const int kScopeInfoOffset = kElementsOffset;
static const int kPreviousOffset = kScopeInfoOffset + 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. */ \
static const int kTodoHeaderSize = kPreviousOffset + kTaggedSize;
// If the extension slot exists, it is the first slot after the header.
static const int kExtensionOffset = kTodoHeaderSize;
// Garbage collection support.
V8_INLINE static constexpr int SizeFor(int length) {
// TODO(v8:9287): This is a workaround for GCMole build failures.
int result = kElementsOffset + length * kTaggedSize;
DCHECK_EQ(TorqueGeneratedContext::SizeFor(length), result);
return result;
}
// 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 OffsetOfElementAt(index) - kHeapObjectTag;
}
// Initializes the variable slots of the context. Lexical variables that need
// initialization are filled with the hole.
void Initialize(Isolate* isolate);
// 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,
// This slot only exists if ScopeInfo::HasContextExtensionSlot returns true.
EXTENSION_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 = EXTENSION_INDEX,
MIN_CONTEXT_EXTENDED_SLOTS = EXTENSION_INDEX + 1,
// 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_EXTENDED_SLOTS
};
static const int kExtensionSize =
(MIN_CONTEXT_EXTENDED_SLOTS - MIN_CONTEXT_SLOTS) * kTaggedSize;
static const int kExtendedHeaderSize = kTodoHeaderSize + kExtensionSize;
// A region of native context entries containing maps for functions created
// by Builtin::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 FIRST_FIXED_TYPED_ARRAY_FUN_INDEX = UINT8_ARRAY_FUN_INDEX;
static const int FIRST_RAB_GSAB_TYPED_ARRAY_MAP_INDEX =
RAB_GSAB_UINT8_ARRAY_MAP_INDEX;
static const int kNoContext = 0;
static const int kInvalidContext = 1;
// Direct slot access.
DECL_ACCESSORS(scope_info, ScopeInfo)
inline Object unchecked_previous() const;
inline Context previous() const;
inline Object next_context_link() const;
inline bool has_extension() const;
inline HeapObject extension() const;
V8_EXPORT_PRIVATE void set_extension(
HeapObject object, WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
JSObject extension_object() const;
JSReceiver extension_receiver() const;
// Find the module context (assuming there is one) and return the associated
// module object.
SourceTextModule module() const;
// Get the context where var declarations will be hoisted to, which
// may be the context itself.
Context declaration_context() const;
bool is_declaration_context() const;
// Get the next closure's context on the context chain.
Context closure_context() const;
// Returns a JSGlobalProxy object or null.
V8_EXPORT_PRIVATE JSGlobalProxy global_proxy() const;
// Get the JSGlobalObject object.
V8_EXPORT_PRIVATE JSGlobalObject global_object() const;
// Get the script context by traversing the context chain.
Context script_context() const;
// Compute the native context.
inline NativeContext native_context() const;
// 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;
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; \
inline type name(AcquireLoadTag) 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);
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)
class BodyDescriptor;
#ifdef VERIFY_HEAP
V8_EXPORT_PRIVATE void VerifyExtensionSlot(HeapObject extension);
#endif
private:
#ifdef DEBUG
// Bootstrapping-aware type checks.
static bool IsBootstrappingOrValidParentContext(Object object, Context kid);
#endif
friend class Factory;
inline void set_previous(Context context,
WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
TQ_OBJECT_CONSTRUCTORS(Context)
};
class NativeContext : public Context {
public:
DECL_CAST(NativeContext)
// TODO(neis): Move some stuff from Context here.
inline void AllocateExternalPointerEntries(Isolate* isolate);
// NativeContext fields are read concurrently from background threads; any
// concurrent writes of affected fields must have acquire-release semantics,
// thus we hide the non-atomic setter. Note this doesn't protect fully since
// one could still use Context::set and/or write directly using offsets (e.g.
// from CSA/Torque).
void set(int index, Object value, WriteBarrierMode mode) = delete;
V8_INLINE void set(int index, Object value, WriteBarrierMode mode,
ReleaseStoreTag);
// [microtask_queue]: pointer to the MicrotaskQueue object.
DECL_GETTER(microtask_queue, MicrotaskQueue*)
inline void set_microtask_queue(Isolate* isolate, MicrotaskQueue* queue);
inline void synchronized_set_script_context_table(
ScriptContextTable script_context_table);
inline ScriptContextTable synchronized_script_context_table() const;
// Caution, hack: this getter ignores the AcquireLoadTag. The global_object
// slot is safe to read concurrently since it is immutable after
// initialization. This function should *not* be used from anywhere other
// than heap-refs.cc.
// TODO(jgruber): Remove this function after NativeContextRef is actually
// never serialized and BROKER_NATIVE_CONTEXT_FIELDS is removed.
JSGlobalObject global_object() { return Context::global_object(); }
JSGlobalObject global_object(AcquireLoadTag) {
return Context::global_object();
}
// 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_EXTENDED_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::kExtendedHeaderSize,
NATIVE_CONTEXT_FIELDS_DEF)
#undef NATIVE_CONTEXT_FIELDS_DEF
class BodyDescriptor;
// The native context stores a list of all optimized code and a list of all
// deoptimized code, which are needed by the deoptimizer.
V8_EXPORT_PRIVATE void AddOptimizedCode(CodeT code);
inline void SetOptimizedCodeListHead(Object head);
inline Object OptimizedCodeListHead();
inline void SetDeoptimizedCodeListHead(Object head);
inline Object DeoptimizedCodeListHead();
void ResetErrorsThrown();
void IncrementErrorsThrown();
int GetErrorsThrown();
#ifdef V8_ENABLE_JAVASCRIPT_PROMISE_HOOKS
void RunPromiseHook(PromiseHookType type, Handle<JSPromise> promise,
Handle<Object> parent);
#endif
private:
STATIC_ASSERT(OffsetOfElementAt(EMBEDDER_DATA_INDEX) ==
Internals::kNativeContextEmbedderDataOffset);
OBJECT_CONSTRUCTORS(NativeContext, Context);
};
using ContextField = Context::Field;
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_CONTEXTS_H_