// 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 {
class RegExpMatchInfo;
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,
};
// 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(ASYNC_FUNCTION_AWAIT_CAUGHT_INDEX, JSFunction, \
async_function_await_caught) \
V(ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX, JSFunction, \
async_function_await_uncaught) \
V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \
async_function_promise_create) \
V(ASYNC_FUNCTION_PROMISE_RELEASE_INDEX, JSFunction, \
async_function_promise_release) \
V(IS_ARRAYLIKE, JSFunction, is_arraylike) \
V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \
V(GET_TEMPLATE_CALL_SITE_INDEX, JSFunction, get_template_call_site) \
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_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(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(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments) \
V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable) \
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(PROMISE_INTERNAL_REJECT_INDEX, JSFunction, promise_internal_reject) \
V(IS_PROMISE_INDEX, JSFunction, is_promise) \
V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \
V(PROMISE_THEN_INDEX, JSFunction, promise_then) \
V(PROMISE_HANDLE_INDEX, JSFunction, promise_handle) \
V(PROMISE_HANDLE_REJECT_INDEX, JSFunction, promise_handle_reject)
#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_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(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \
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_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(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \
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_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_METHOD_INDEX, JSFunction, set_add) \
V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete) \
V(SET_HAS_METHOD_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)
#define NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(V) \
V(TYPED_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, typed_array_key_iterator_map) \
V(FAST_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, fast_array_key_iterator_map) \
V(GENERIC_ARRAY_KEY_ITERATOR_MAP_INDEX, Map, array_key_iterator_map) \
\
V(UINT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint8_array_key_value_iterator_map) \
V(INT8_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
int8_array_key_value_iterator_map) \
V(UINT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint16_array_key_value_iterator_map) \
V(INT16_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
int16_array_key_value_iterator_map) \
V(UINT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint32_array_key_value_iterator_map) \
V(INT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
int32_array_key_value_iterator_map) \
V(FLOAT32_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
float32_array_key_value_iterator_map) \
V(FLOAT64_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
float64_array_key_value_iterator_map) \
V(UINT8_CLAMPED_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint8_clamped_array_key_value_iterator_map) \
\
V(FAST_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_smi_array_key_value_iterator_map) \
V(FAST_HOLEY_SMI_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_smi_array_key_value_iterator_map) \
V(FAST_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_array_key_value_iterator_map) \
V(FAST_HOLEY_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_array_key_value_iterator_map) \
V(FAST_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_double_array_key_value_iterator_map) \
V(FAST_HOLEY_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_double_array_key_value_iterator_map) \
V(GENERIC_ARRAY_KEY_VALUE_ITERATOR_MAP_INDEX, Map, \
array_key_value_iterator_map) \
\
V(UINT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, uint8_array_value_iterator_map) \
V(INT8_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int8_array_value_iterator_map) \
V(UINT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint16_array_value_iterator_map) \
V(INT16_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int16_array_value_iterator_map) \
V(UINT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint32_array_value_iterator_map) \
V(INT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, int32_array_value_iterator_map) \
V(FLOAT32_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
float32_array_value_iterator_map) \
V(FLOAT64_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
float64_array_value_iterator_map) \
V(UINT8_CLAMPED_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
uint8_clamped_array_value_iterator_map) \
\
V(FAST_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_smi_array_value_iterator_map) \
V(FAST_HOLEY_SMI_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_smi_array_value_iterator_map) \
V(FAST_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, fast_array_value_iterator_map) \
V(FAST_HOLEY_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_array_value_iterator_map) \
V(FAST_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_double_array_value_iterator_map) \
V(FAST_HOLEY_DOUBLE_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, \
fast_holey_double_array_value_iterator_map) \
V(GENERIC_ARRAY_VALUE_ITERATOR_MAP_INDEX, Map, array_value_iterator_map)
#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_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_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \
async_iterator_value_unwrap_shared_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(CURRENT_MODULE_INDEX, Module, current_module) \
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, 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(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \
initial_array_iterator_prototype) \
V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \
initial_array_iterator_prototype_map) \
V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \
V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \
V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \
V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \
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(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \
V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \
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_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \
V(INTL_V8_BREAK_ITERATOR_FUNCTION_INDEX, JSFunction, \
intl_v8_break_iterator_function) \
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_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(MAP_CACHE_INDEX, Object, map_cache) \
V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \
V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \
V(MATH_RANDOM_CACHE_INDEX, Object, math_random_cache) \
V(MESSAGE_LISTENERS_INDEX, TemplateList, 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_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \
V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \
V(OSR_CODE_TABLE_INDEX, FixedArray, osr_code_table) \
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(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \
promise_get_capabilities_executor_shared_fun) \
V(PROMISE_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
promise_resolve_shared_fun) \
V(PROMISE_REJECT_SHARED_FUN, SharedFunctionInfo, promise_reject_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_PROTOTYPE_MAP_INDEX, Map, promise_prototype_map) \
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(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(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \
V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \
slow_object_with_null_prototype_map) \
V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, UnseededNumberDictionary, \
slow_template_instantiations_cache) \
V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \
V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \
V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \
V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \
strict_function_without_prototype_map) \
V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_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(STRING_ITERATOR_MAP_INDEX, Map, string_iterator_map) \
V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \
V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \
V(WASM_FUNCTION_MAP_INDEX, Map, wasm_function_map) \
V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \
V(WASM_INSTANCE_SYM_INDEX, Symbol, wasm_instance_sym) \
V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \
V(WASM_MEMORY_SYM_INDEX, Symbol, wasm_memory_sym) \
V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \
V(WASM_MODULE_SYM_INDEX, Symbol, wasm_module_sym) \
V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \
V(WASM_TABLE_SYM_INDEX, Symbol, wasm_table_sym) \
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(EXPORTS_CONTAINER, Object, exports_container) \
NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \
NATIVE_CONTEXT_IMPORTED_FIELDS(V) \
NATIVE_CONTEXT_JS_ARRAY_ITERATOR_MAPS(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<Context> GetContext(Handle<ScriptContextTable> 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<ScriptContextTable> table, Handle<String> name,
LookupResult* result);
MUST_USE_RESULT
static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table,
Handle<Context> 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.
//
// [ extension ] Additional data.
//
// For script contexts, it contains the respective ScopeInfo.
//
// For catch contexts, it contains a ContextExtension object
// consisting of the ScopeInfo and the name of the catch
// variable.
//
// For module contexts, it contains the module object.
//
// For block contexts, it contains either the respective
// ScopeInfo or a ContextExtension object consisting of the
// ScopeInfo and an "extension object" (see below).
//
// For with contexts, it contains a ContextExtension object
// consisting of the ScopeInfo and 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 FixedArray {
public:
// Conversions.
static inline Context* cast(Object* context);
// The default context slot layout; indices are FixedArray slot indices.
enum Field {
// 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 ResetErrorsThrown();
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();
// 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.
JSObject* global_proxy();
void set_global_proxy(JSObject* 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 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 IsEvalContext();
inline bool IsScriptContext();
inline bool HasSameSecurityTokenAs(Context* that);
// Removes a specific optimized code object from the optimized code map.
// In case of non-OSR the code reference is cleared from the cache entry but
// the entry itself is left in the map in order to proceed sharing literals.
void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
// Clear optimized code map.
void ClearOptimizedCodeMap();
// A native context keeps track of all osrd optimized functions.
inline bool OptimizedCodeMapIsCleared();
Code* SearchOptimizedCodeMap(SharedFunctionInfo* shared,
BailoutId osr_ast_id);
int SearchOptimizedCodeMapEntry(SharedFunctionInfo* shared,
BailoutId osr_ast_id);
static void AddToOptimizedCodeMap(Handle<Context> native_context,
Handle<SharedFunctionInfo> shared,
Handle<Code> code,
BailoutId osr_ast_id);
// 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<Object> ErrorMessageForCodeGenerationFromStrings();
static int ImportedFieldIndexForName(Handle<String> name);
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); \
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<Object> Lookup(Handle<String> name, ContextLookupFlags flags,
int* index, PropertyAttributes* attributes,
InitializationFlag* init_flag,
VariableMode* variable_mode);
// Code generation support.
static int SlotOffset(int index) {
return kHeaderSize + index * kPointerSize - kHeapObjectTag;
}
static int FunctionMapIndex(LanguageMode language_mode, FunctionKind kind) {
// Note: Must be kept in sync with the FastNewClosure builtin.
if (IsGeneratorFunction(kind)) {
return GENERATOR_FUNCTION_MAP_INDEX;
}
if (IsAsyncFunction(kind)) {
return ASYNC_FUNCTION_MAP_INDEX;
}
if (IsClassConstructor(kind)) {
// Like the strict function map, but with no 'name' accessor. 'name'
// needs to be the last property and it is added during instantiation,
// in case a static property with the same name exists"
return CLASS_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.
V8_EXPORT_PRIVATE 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);
};
typedef Context::Field ContextField;
} // namespace internal
} // namespace v8
#endif // V8_CONTEXTS_H_