Line data Source code
1 : // Copyright 2012 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_CONTEXTS_H_
6 : #define V8_CONTEXTS_H_
7 :
8 : #include "src/function-kind.h"
9 : #include "src/objects/fixed-array.h"
10 : #include "torque-generated/class-definitions-from-dsl.h"
11 : // Has to be the last include (doesn't have include guards):
12 : #include "src/objects/object-macros.h"
13 :
14 : namespace v8 {
15 : namespace internal {
16 :
17 : class JSGlobalObject;
18 : class JSGlobalProxy;
19 : class MicrotaskQueue;
20 : class NativeContext;
21 : class RegExpMatchInfo;
22 :
23 : enum ContextLookupFlags {
24 : FOLLOW_CONTEXT_CHAIN = 1 << 0,
25 : FOLLOW_PROTOTYPE_CHAIN = 1 << 1,
26 :
27 : DONT_FOLLOW_CHAINS = 0,
28 : FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN,
29 : };
30 :
31 : // Heap-allocated activation contexts.
32 : //
33 : // Contexts are implemented as FixedArray-like objects having a fixed
34 : // header with a set of common fields.
35 : //
36 : // Note: Context must have no virtual functions and Context objects
37 : // must always be allocated via Heap::AllocateContext() or
38 : // Factory::NewContext.
39 :
40 : #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \
41 : V(ASYNC_FUNCTION_PROMISE_CREATE_INDEX, JSFunction, \
42 : async_function_promise_create) \
43 : V(IS_ARRAYLIKE, JSFunction, is_arraylike) \
44 : V(GENERATOR_NEXT_INTERNAL, JSFunction, generator_next_internal) \
45 : V(MAKE_ERROR_INDEX, JSFunction, make_error) \
46 : V(MAKE_RANGE_ERROR_INDEX, JSFunction, make_range_error) \
47 : V(MAKE_SYNTAX_ERROR_INDEX, JSFunction, make_syntax_error) \
48 : V(MAKE_TYPE_ERROR_INDEX, JSFunction, make_type_error) \
49 : V(MAKE_URI_ERROR_INDEX, JSFunction, make_uri_error) \
50 : V(OBJECT_CREATE, JSFunction, object_create) \
51 : V(OBJECT_DEFINE_PROPERTIES, JSFunction, object_define_properties) \
52 : V(OBJECT_DEFINE_PROPERTY, JSFunction, object_define_property) \
53 : V(OBJECT_GET_PROTOTYPE_OF, JSFunction, object_get_prototype_of) \
54 : V(OBJECT_IS_EXTENSIBLE, JSFunction, object_is_extensible) \
55 : V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen) \
56 : V(OBJECT_IS_SEALED, JSFunction, object_is_sealed) \
57 : V(OBJECT_KEYS, JSFunction, object_keys) \
58 : V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply) \
59 : V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct) \
60 : V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \
61 : V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \
62 : V(MATH_FLOOR_INDEX, JSFunction, math_floor) \
63 : V(MATH_POW_INDEX, JSFunction, math_pow) \
64 : V(NEW_PROMISE_CAPABILITY_INDEX, JSFunction, new_promise_capability) \
65 : V(PROMISE_INTERNAL_CONSTRUCTOR_INDEX, JSFunction, \
66 : promise_internal_constructor) \
67 : V(IS_PROMISE_INDEX, JSFunction, is_promise) \
68 : V(PROMISE_THEN_INDEX, JSFunction, promise_then)
69 :
70 : #define NATIVE_CONTEXT_FIELDS(V) \
71 : V(GLOBAL_PROXY_INDEX, JSGlobalProxy, global_proxy_object) \
72 : /* TODO(ishell): Actually we store exactly EmbedderDataArray here but */ \
73 : /* it's already UBSan-fiendly and doesn't require a star... So declare */ \
74 : /* it as a HeapObject for now. */ \
75 : V(EMBEDDER_DATA_INDEX, HeapObject, embedder_data) \
76 : /* Below is alpha-sorted */ \
77 : V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, \
78 : accessor_property_descriptor_map) \
79 : V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \
80 : V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \
81 : V(ARRAY_BUFFER_MAP_INDEX, Map, array_buffer_map) \
82 : V(ARRAY_BUFFER_NOINIT_FUN_INDEX, JSFunction, array_buffer_noinit_fun) \
83 : V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \
84 : V(ARRAY_JOIN_STACK_INDEX, HeapObject, array_join_stack) \
85 : V(ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX, Map, async_from_sync_iterator_map) \
86 : V(ASYNC_FUNCTION_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \
87 : async_function_await_reject_shared_fun) \
88 : V(ASYNC_FUNCTION_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
89 : async_function_await_resolve_shared_fun) \
90 : V(ASYNC_FUNCTION_FUNCTION_INDEX, JSFunction, async_function_constructor) \
91 : V(ASYNC_FUNCTION_OBJECT_MAP_INDEX, Map, async_function_object_map) \
92 : V(ASYNC_GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \
93 : async_generator_function_function) \
94 : V(ASYNC_ITERATOR_VALUE_UNWRAP_SHARED_FUN, SharedFunctionInfo, \
95 : async_iterator_value_unwrap_shared_fun) \
96 : V(ASYNC_GENERATOR_AWAIT_REJECT_SHARED_FUN, SharedFunctionInfo, \
97 : async_generator_await_reject_shared_fun) \
98 : V(ASYNC_GENERATOR_AWAIT_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
99 : async_generator_await_resolve_shared_fun) \
100 : V(ASYNC_GENERATOR_YIELD_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
101 : async_generator_yield_resolve_shared_fun) \
102 : V(ASYNC_GENERATOR_RETURN_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
103 : async_generator_return_resolve_shared_fun) \
104 : V(ASYNC_GENERATOR_RETURN_CLOSED_RESOLVE_SHARED_FUN, SharedFunctionInfo, \
105 : async_generator_return_closed_resolve_shared_fun) \
106 : V(ASYNC_GENERATOR_RETURN_CLOSED_REJECT_SHARED_FUN, SharedFunctionInfo, \
107 : async_generator_return_closed_reject_shared_fun) \
108 : V(ATOMICS_OBJECT, JSObject, atomics_object) \
109 : V(BIGINT_FUNCTION_INDEX, JSFunction, bigint_function) \
110 : V(BIGINT64_ARRAY_FUN_INDEX, JSFunction, bigint64_array_fun) \
111 : V(BIGUINT64_ARRAY_FUN_INDEX, JSFunction, biguint64_array_fun) \
112 : V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \
113 : V(BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX, Map, \
114 : bound_function_with_constructor_map) \
115 : V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map, \
116 : bound_function_without_constructor_map) \
117 : V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \
118 : call_as_constructor_delegate) \
119 : V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \
120 : V(CALLSITE_FUNCTION_INDEX, JSFunction, callsite_function) \
121 : V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \
122 : V(DATA_PROPERTY_DESCRIPTOR_MAP_INDEX, Map, data_property_descriptor_map) \
123 : V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \
124 : V(DATE_FUNCTION_INDEX, JSFunction, date_function) \
125 : V(DEBUG_CONTEXT_ID_INDEX, Object, debug_context_id) \
126 : V(EMPTY_FUNCTION_INDEX, JSFunction, empty_function) \
127 : V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \
128 : error_message_for_code_gen_from_strings) \
129 : V(ERRORS_THROWN_INDEX, Smi, errors_thrown) \
130 : V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object) \
131 : V(EXTRAS_UTILS_OBJECT_INDEX, Object, extras_utils_object) \
132 : V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map) \
133 : V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, FixedArray, \
134 : fast_template_instantiations_cache) \
135 : V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \
136 : V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \
137 : V(FUNCTION_FUNCTION_INDEX, JSFunction, function_function) \
138 : V(GENERATOR_FUNCTION_FUNCTION_INDEX, JSFunction, \
139 : generator_function_function) \
140 : V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \
141 : V(ASYNC_GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, \
142 : async_generator_object_prototype_map) \
143 : V(INITIAL_ARRAY_ITERATOR_MAP_INDEX, Map, initial_array_iterator_map) \
144 : V(INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX, JSObject, \
145 : initial_array_iterator_prototype) \
146 : V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \
147 : V(INITIAL_ERROR_PROTOTYPE_INDEX, JSObject, initial_error_prototype) \
148 : V(INITIAL_GENERATOR_PROTOTYPE_INDEX, JSObject, initial_generator_prototype) \
149 : V(INITIAL_ASYNC_GENERATOR_PROTOTYPE_INDEX, JSObject, \
150 : initial_async_generator_prototype) \
151 : V(INITIAL_ITERATOR_PROTOTYPE_INDEX, JSObject, initial_iterator_prototype) \
152 : V(INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX, JSObject, \
153 : initial_map_iterator_prototype) \
154 : V(INITIAL_MAP_PROTOTYPE_MAP_INDEX, Map, initial_map_prototype_map) \
155 : V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \
156 : V(INITIAL_SET_ITERATOR_PROTOTYPE_INDEX, JSObject, \
157 : initial_set_iterator_prototype) \
158 : V(INITIAL_SET_PROTOTYPE_INDEX, JSObject, initial_set_prototype) \
159 : V(INITIAL_SET_PROTOTYPE_MAP_INDEX, Map, initial_set_prototype_map) \
160 : V(INITIAL_STRING_ITERATOR_MAP_INDEX, Map, initial_string_iterator_map) \
161 : V(INITIAL_STRING_ITERATOR_PROTOTYPE_INDEX, JSObject, \
162 : initial_string_iterator_prototype) \
163 : V(INITIAL_STRING_PROTOTYPE_INDEX, JSObject, initial_string_prototype) \
164 : V(INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX, Map, initial_weakmap_prototype_map) \
165 : V(INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX, Map, initial_weakset_prototype_map) \
166 : V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \
167 : V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \
168 : V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \
169 : V(INTL_COLLATOR_FUNCTION_INDEX, JSFunction, intl_collator_function) \
170 : V(INTL_DATE_TIME_FORMAT_FUNCTION_INDEX, JSFunction, \
171 : intl_date_time_format_function) \
172 : V(INTL_NUMBER_FORMAT_FUNCTION_INDEX, JSFunction, \
173 : intl_number_format_function) \
174 : V(INTL_LOCALE_FUNCTION_INDEX, JSFunction, intl_locale_function) \
175 : V(INTL_SEGMENT_ITERATOR_MAP_INDEX, Map, intl_segment_iterator_map) \
176 : V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \
177 : V(JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX, Map, \
178 : js_array_packed_smi_elements_map) \
179 : V(JS_ARRAY_HOLEY_SMI_ELEMENTS_MAP_INDEX, Map, \
180 : js_array_holey_smi_elements_map) \
181 : V(JS_ARRAY_PACKED_ELEMENTS_MAP_INDEX, Map, js_array_packed_elements_map) \
182 : V(JS_ARRAY_HOLEY_ELEMENTS_MAP_INDEX, Map, js_array_holey_elements_map) \
183 : V(JS_ARRAY_PACKED_DOUBLE_ELEMENTS_MAP_INDEX, Map, \
184 : js_array_packed_double_elements_map) \
185 : V(JS_ARRAY_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX, Map, \
186 : js_array_holey_double_elements_map) \
187 : V(JS_MAP_FUN_INDEX, JSFunction, js_map_fun) \
188 : V(JS_MAP_MAP_INDEX, Map, js_map_map) \
189 : V(JS_MODULE_NAMESPACE_MAP, Map, js_module_namespace_map) \
190 : V(JS_SET_FUN_INDEX, JSFunction, js_set_fun) \
191 : V(JS_SET_MAP_INDEX, Map, js_set_map) \
192 : V(WEAK_CELL_MAP_INDEX, Map, weak_cell_map) \
193 : V(JS_FINALIZATION_GROUP_CLEANUP_ITERATOR_MAP_INDEX, Map, \
194 : js_finalization_group_cleanup_iterator_map) \
195 : V(JS_WEAK_MAP_FUN_INDEX, JSFunction, js_weak_map_fun) \
196 : V(JS_WEAK_REF_MAP_INDEX, Map, js_weak_ref_map) \
197 : V(JS_WEAK_SET_FUN_INDEX, JSFunction, js_weak_set_fun) \
198 : V(MAP_CACHE_INDEX, Object, map_cache) \
199 : V(MAP_KEY_ITERATOR_MAP_INDEX, Map, map_key_iterator_map) \
200 : V(MAP_KEY_VALUE_ITERATOR_MAP_INDEX, Map, map_key_value_iterator_map) \
201 : V(MAP_VALUE_ITERATOR_MAP_INDEX, Map, map_value_iterator_map) \
202 : V(MATH_RANDOM_INDEX_INDEX, Smi, math_random_index) \
203 : V(MATH_RANDOM_STATE_INDEX, ByteArray, math_random_state) \
204 : V(MATH_RANDOM_CACHE_INDEX, FixedDoubleArray, math_random_cache) \
205 : V(MESSAGE_LISTENERS_INDEX, TemplateList, message_listeners) \
206 : V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \
207 : V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \
208 : V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \
209 : V(OBJECT_FUNCTION_PROTOTYPE_MAP_INDEX, Map, object_function_prototype_map) \
210 : V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \
211 : V(PROXY_CALLABLE_MAP_INDEX, Map, proxy_callable_map) \
212 : V(PROXY_CONSTRUCTOR_MAP_INDEX, Map, proxy_constructor_map) \
213 : V(PROXY_FUNCTION_INDEX, JSFunction, proxy_function) \
214 : V(PROXY_MAP_INDEX, Map, proxy_map) \
215 : V(PROXY_REVOCABLE_RESULT_MAP_INDEX, Map, proxy_revocable_result_map) \
216 : V(PROXY_REVOKE_SHARED_FUN, SharedFunctionInfo, proxy_revoke_shared_fun) \
217 : V(PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN, SharedFunctionInfo, \
218 : promise_get_capabilities_executor_shared_fun) \
219 : V(PROMISE_CAPABILITY_DEFAULT_REJECT_SHARED_FUN_INDEX, SharedFunctionInfo, \
220 : promise_capability_default_reject_shared_fun) \
221 : V(PROMISE_CAPABILITY_DEFAULT_RESOLVE_SHARED_FUN_INDEX, SharedFunctionInfo, \
222 : promise_capability_default_resolve_shared_fun) \
223 : V(PROMISE_THEN_FINALLY_SHARED_FUN, SharedFunctionInfo, \
224 : promise_then_finally_shared_fun) \
225 : V(PROMISE_CATCH_FINALLY_SHARED_FUN, SharedFunctionInfo, \
226 : promise_catch_finally_shared_fun) \
227 : V(PROMISE_VALUE_THUNK_FINALLY_SHARED_FUN, SharedFunctionInfo, \
228 : promise_value_thunk_finally_shared_fun) \
229 : V(PROMISE_THROWER_FINALLY_SHARED_FUN, SharedFunctionInfo, \
230 : promise_thrower_finally_shared_fun) \
231 : V(PROMISE_ALL_RESOLVE_ELEMENT_SHARED_FUN, SharedFunctionInfo, \
232 : promise_all_resolve_element_shared_fun) \
233 : V(PROMISE_ALL_SETTLED_RESOLVE_ELEMENT_SHARED_FUN, SharedFunctionInfo, \
234 : promise_all_settled_resolve_element_shared_fun) \
235 : V(PROMISE_ALL_SETTLED_REJECT_ELEMENT_SHARED_FUN, SharedFunctionInfo, \
236 : promise_all_settled_reject_element_shared_fun) \
237 : V(PROMISE_PROTOTYPE_INDEX, JSObject, promise_prototype) \
238 : V(REGEXP_EXEC_FUNCTION_INDEX, JSFunction, regexp_exec_function) \
239 : V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \
240 : V(REGEXP_LAST_MATCH_INFO_INDEX, RegExpMatchInfo, regexp_last_match_info) \
241 : V(REGEXP_PROTOTYPE_MAP_INDEX, Map, regexp_prototype_map) \
242 : V(INITIAL_REGEXP_STRING_ITERATOR_PROTOTYPE_MAP_INDEX, Map, \
243 : initial_regexp_string_iterator_prototype_map) \
244 : V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \
245 : V(REGEXP_PROTOTYPE_INDEX, JSObject, regexp_prototype) \
246 : V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) \
247 : V(SECURITY_TOKEN_INDEX, Object, security_token) \
248 : V(SERIALIZED_OBJECTS, FixedArray, serialized_objects) \
249 : V(SET_VALUE_ITERATOR_MAP_INDEX, Map, set_value_iterator_map) \
250 : V(SET_KEY_VALUE_ITERATOR_MAP_INDEX, Map, set_key_value_iterator_map) \
251 : V(SHARED_ARRAY_BUFFER_FUN_INDEX, JSFunction, shared_array_buffer_fun) \
252 : V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \
253 : V(SLOW_ALIASED_ARGUMENTS_MAP_INDEX, Map, slow_aliased_arguments_map) \
254 : V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \
255 : V(SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP, Map, \
256 : slow_object_with_null_prototype_map) \
257 : V(SLOW_OBJECT_WITH_OBJECT_PROTOTYPE_MAP, Map, \
258 : slow_object_with_object_prototype_map) \
259 : V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_INDEX, SimpleNumberDictionary, \
260 : slow_template_instantiations_cache) \
261 : /* All *_FUNCTION_MAP_INDEX definitions used by Context::FunctionMapIndex */ \
262 : /* must remain together. */ \
263 : V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \
264 : V(SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX, Map, sloppy_function_with_name_map) \
265 : V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \
266 : sloppy_function_without_prototype_map) \
267 : V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \
268 : sloppy_function_with_readonly_prototype_map) \
269 : V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \
270 : V(STRICT_FUNCTION_WITH_NAME_MAP_INDEX, Map, strict_function_with_name_map) \
271 : V(STRICT_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \
272 : strict_function_with_readonly_prototype_map) \
273 : V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \
274 : strict_function_without_prototype_map) \
275 : V(METHOD_WITH_NAME_MAP_INDEX, Map, method_with_name_map) \
276 : V(METHOD_WITH_HOME_OBJECT_MAP_INDEX, Map, method_with_home_object_map) \
277 : V(METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \
278 : method_with_name_and_home_object_map) \
279 : V(ASYNC_FUNCTION_MAP_INDEX, Map, async_function_map) \
280 : V(ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, Map, async_function_with_name_map) \
281 : V(ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \
282 : async_function_with_home_object_map) \
283 : V(ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \
284 : async_function_with_name_and_home_object_map) \
285 : V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \
286 : V(GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \
287 : generator_function_with_name_map) \
288 : V(GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \
289 : generator_function_with_home_object_map) \
290 : V(GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \
291 : generator_function_with_name_and_home_object_map) \
292 : V(ASYNC_GENERATOR_FUNCTION_MAP_INDEX, Map, async_generator_function_map) \
293 : V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, Map, \
294 : async_generator_function_with_name_map) \
295 : V(ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, Map, \
296 : async_generator_function_with_home_object_map) \
297 : V(ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX, Map, \
298 : async_generator_function_with_name_and_home_object_map) \
299 : V(CLASS_FUNCTION_MAP_INDEX, Map, class_function_map) \
300 : V(STRING_FUNCTION_INDEX, JSFunction, string_function) \
301 : V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \
302 : V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \
303 : V(NATIVE_FUNCTION_MAP_INDEX, Map, native_function_map) \
304 : V(WASM_EXCEPTION_CONSTRUCTOR_INDEX, JSFunction, wasm_exception_constructor) \
305 : V(WASM_GLOBAL_CONSTRUCTOR_INDEX, JSFunction, wasm_global_constructor) \
306 : V(WASM_INSTANCE_CONSTRUCTOR_INDEX, JSFunction, wasm_instance_constructor) \
307 : V(WASM_MEMORY_CONSTRUCTOR_INDEX, JSFunction, wasm_memory_constructor) \
308 : V(WASM_MODULE_CONSTRUCTOR_INDEX, JSFunction, wasm_module_constructor) \
309 : V(WASM_TABLE_CONSTRUCTOR_INDEX, JSFunction, wasm_table_constructor) \
310 : V(TEMPLATE_WEAKMAP_INDEX, HeapObject, template_weakmap) \
311 : V(TYPED_ARRAY_FUN_INDEX, JSFunction, typed_array_function) \
312 : V(TYPED_ARRAY_PROTOTYPE_INDEX, JSObject, typed_array_prototype) \
313 : V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \
314 : V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \
315 : V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \
316 : V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \
317 : V(ARRAY_ENTRIES_ITERATOR_INDEX, JSFunction, array_entries_iterator) \
318 : V(ARRAY_FOR_EACH_ITERATOR_INDEX, JSFunction, array_for_each_iterator) \
319 : V(ARRAY_KEYS_ITERATOR_INDEX, JSFunction, array_keys_iterator) \
320 : V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \
321 : V(ERROR_FUNCTION_INDEX, JSFunction, error_function) \
322 : V(ERROR_TO_STRING, JSFunction, error_to_string) \
323 : V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function) \
324 : V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \
325 : V(GLOBAL_PROXY_FUNCTION_INDEX, JSFunction, global_proxy_function) \
326 : V(MAP_DELETE_INDEX, JSFunction, map_delete) \
327 : V(MAP_GET_INDEX, JSFunction, map_get) \
328 : V(MAP_HAS_INDEX, JSFunction, map_has) \
329 : V(MAP_SET_INDEX, JSFunction, map_set) \
330 : V(FUNCTION_HAS_INSTANCE_INDEX, JSFunction, function_has_instance) \
331 : V(OBJECT_TO_STRING, JSFunction, object_to_string) \
332 : V(PROMISE_ALL_INDEX, JSFunction, promise_all) \
333 : V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \
334 : V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function) \
335 : V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function) \
336 : V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \
337 : V(SET_ADD_INDEX, JSFunction, set_add) \
338 : V(SET_DELETE_INDEX, JSFunction, set_delete) \
339 : V(SET_HAS_INDEX, JSFunction, set_has) \
340 : V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function) \
341 : V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function) \
342 : V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function) \
343 : V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction, \
344 : wasm_compile_error_function) \
345 : V(WASM_LINK_ERROR_FUNCTION_INDEX, JSFunction, wasm_link_error_function) \
346 : V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, \
347 : wasm_runtime_error_function) \
348 : V(WEAKMAP_SET_INDEX, JSFunction, weakmap_set) \
349 : V(WEAKMAP_GET_INDEX, JSFunction, weakmap_get) \
350 : V(WEAKSET_ADD_INDEX, JSFunction, weakset_add) \
351 : NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V)
352 :
353 : // A table of all script contexts. Every loaded top-level script with top-level
354 : // lexical declarations contributes its ScriptContext into this table.
355 : //
356 : // The table is a fixed array, its first slot is the current used count and
357 : // the subsequent slots 1..used contain ScriptContexts.
358 : class ScriptContextTable : public FixedArray {
359 : public:
360 : DECL_CAST(ScriptContextTable)
361 :
362 : struct LookupResult {
363 : int context_index;
364 : int slot_index;
365 : VariableMode mode;
366 : InitializationFlag init_flag;
367 : MaybeAssignedFlag maybe_assigned_flag;
368 : };
369 :
370 : inline int used() const;
371 : inline void set_used(int used);
372 :
373 : static inline Handle<Context> GetContext(Isolate* isolate,
374 : Handle<ScriptContextTable> table,
375 : int i);
376 : inline Context get_context(int i) const;
377 :
378 : // Lookup a variable `name` in a ScriptContextTable.
379 : // If it returns true, the variable is found and `result` contains
380 : // valid information about its location.
381 : // If it returns false, `result` is untouched.
382 : V8_WARN_UNUSED_RESULT
383 : V8_EXPORT_PRIVATE static bool Lookup(Isolate* isolate,
384 : ScriptContextTable table, String name,
385 : LookupResult* result);
386 :
387 : V8_WARN_UNUSED_RESULT
388 : static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table,
389 : Handle<Context> script_context);
390 :
391 : static const int kUsedSlotIndex = 0;
392 : static const int kFirstContextSlotIndex = 1;
393 : static const int kMinLength = kFirstContextSlotIndex;
394 :
395 : OBJECT_CONSTRUCTORS(ScriptContextTable, FixedArray);
396 : };
397 :
398 : // JSFunctions are pairs (context, function code), sometimes also called
399 : // closures. A Context object is used to represent function contexts and
400 : // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak).
401 : //
402 : // At runtime, the contexts build a stack in parallel to the execution
403 : // stack, with the top-most context being the current context. All contexts
404 : // have the following slots:
405 : //
406 : // [ scope_info ] This is the scope info describing the current context. It
407 : // contains the names of statically allocated context slots,
408 : // and stack-allocated locals. The names are needed for
409 : // dynamic lookups in the presence of 'with' or 'eval', and
410 : // for the debugger.
411 : //
412 : // [ previous ] A pointer to the previous context.
413 : //
414 : // [ extension ] Additional data.
415 : //
416 : // For native contexts, it contains the global object.
417 : // For module contexts, it contains the module object.
418 : // For await contexts, it contains the generator object.
419 : // For block contexts, it may contain an "extension object".
420 : // For with contexts, it contains an "extension object".
421 : //
422 : // An "extension object" is used to dynamically extend a
423 : // context with additional variables, namely in the
424 : // implementation of the 'with' construct and the 'eval'
425 : // construct. For instance, Context::Lookup also searches
426 : // the extension object for properties. (Storing the
427 : // extension object is the original purpose of this context
428 : // slot, hence the name.)
429 : //
430 : // [ native_context ] A pointer to the native context.
431 : //
432 : // In addition, function contexts may have statically allocated context slots
433 : // to store local variables/functions that are accessed from inner functions
434 : // (via static context addresses) or through 'eval' (dynamic context lookups).
435 : // The native context contains additional slots for fast access to native
436 : // properties.
437 : //
438 : // Finally, with Harmony scoping, the JSFunction representing a top level
439 : // script will have the ScriptContext rather than a FunctionContext.
440 : // Script contexts from all top-level scripts are gathered in
441 : // ScriptContextTable.
442 :
443 : class Context : public HeapObject {
444 : public:
445 : NEVER_READ_ONLY_SPACE
446 :
447 : DECL_CAST(Context)
448 :
449 : // [length]: length of the context.
450 : V8_INLINE int length() const;
451 : V8_INLINE void set_length(int value);
452 :
453 : // Setter and getter for elements.
454 : V8_INLINE Object get(int index) const;
455 : V8_INLINE void set(int index, Object value);
456 : // Setter with explicit barrier mode.
457 : V8_INLINE void set(int index, Object value, WriteBarrierMode mode);
458 :
459 : DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize,
460 : TORQUE_GENERATED_CONTEXT_FIELDS)
461 : // TODO(v8:8989): [torque] Support marker constants.
462 : /* TODO(ishell): remove this fixedArray-like header size. */
463 : static const int kHeaderSize = kScopeInfoOffset;
464 : static const int kStartOfTaggedFieldsOffset = kScopeInfoOffset;
465 : /* Header size. */ \
466 : /* TODO(ishell): use this as header size once MIN_CONTEXT_SLOTS */ \
467 : /* is removed in favour of offset-based access to common fields. */ \
468 : static const int kTodoHeaderSize = kSize;
469 :
470 : // Garbage collection support.
471 : V8_INLINE static constexpr int SizeFor(int length) {
472 : // TODO(ishell): switch to kTodoHeaderSize based approach once we no longer
473 : // reference common Context fields via index
474 43668377 : return kHeaderSize + length * kTaggedSize;
475 : }
476 :
477 : // Code Generation support.
478 : // Offset of the element from the beginning of object.
479 : V8_INLINE static constexpr int OffsetOfElementAt(int index) {
480 : return SizeFor(index);
481 : }
482 : // Offset of the element from the heap object pointer.
483 : V8_INLINE static constexpr int SlotOffset(int index) {
484 86852 : return SizeFor(index) - kHeapObjectTag;
485 : }
486 :
487 : // TODO(ishell): eventually migrate to the offset based access instead of
488 : // index-based.
489 : // The default context slot layout; indices are FixedArray slot indices.
490 : enum Field {
491 : // TODO(shell): use offset-based approach for accessing common values.
492 : // These slots are in all contexts.
493 : SCOPE_INFO_INDEX,
494 : PREVIOUS_INDEX,
495 : EXTENSION_INDEX,
496 : NATIVE_CONTEXT_INDEX,
497 :
498 : // These slots are only in native contexts.
499 : #define NATIVE_CONTEXT_SLOT(index, type, name) index,
500 : NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_SLOT)
501 : #undef NATIVE_CONTEXT_SLOT
502 :
503 : // Properties from here are treated as weak references by the full GC.
504 : // Scavenge treats them as strong references.
505 : OPTIMIZED_CODE_LIST, // Weak.
506 : DEOPTIMIZED_CODE_LIST, // Weak.
507 : NEXT_CONTEXT_LINK, // Weak.
508 :
509 : // Total number of slots.
510 : NATIVE_CONTEXT_SLOTS,
511 : FIRST_WEAK_SLOT = OPTIMIZED_CODE_LIST,
512 : FIRST_JS_ARRAY_MAP_SLOT = JS_ARRAY_PACKED_SMI_ELEMENTS_MAP_INDEX,
513 :
514 : // TODO(shell): Remove, once it becomes zero
515 : MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX,
516 :
517 : // This slot holds the thrown value in catch contexts.
518 : THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS,
519 :
520 : // These slots hold values in debug evaluate contexts.
521 : WRAPPED_CONTEXT_INDEX = MIN_CONTEXT_SLOTS,
522 : WHITE_LIST_INDEX = MIN_CONTEXT_SLOTS + 1
523 : };
524 :
525 : // A region of native context entries containing maps for functions created
526 : // by Builtins::kFastNewClosure.
527 : static const int FIRST_FUNCTION_MAP_INDEX = SLOPPY_FUNCTION_MAP_INDEX;
528 : static const int LAST_FUNCTION_MAP_INDEX = CLASS_FUNCTION_MAP_INDEX;
529 :
530 : static const int kNoContext = 0;
531 : static const int kInvalidContext = 1;
532 :
533 : void ResetErrorsThrown();
534 : void IncrementErrorsThrown();
535 : int GetErrorsThrown();
536 :
537 : // Direct slot access.
538 : inline void set_scope_info(ScopeInfo scope_info);
539 :
540 : inline Object unchecked_previous();
541 : inline Context previous();
542 : inline void set_previous(Context context);
543 :
544 : inline Object next_context_link();
545 :
546 : inline bool has_extension();
547 : inline HeapObject extension();
548 : inline void set_extension(HeapObject object);
549 : JSObject extension_object();
550 : JSReceiver extension_receiver();
551 : V8_EXPORT_PRIVATE ScopeInfo scope_info();
552 :
553 : // Find the module context (assuming there is one) and return the associated
554 : // module object.
555 : Module module();
556 :
557 : // Get the context where var declarations will be hoisted to, which
558 : // may be the context itself.
559 : Context declaration_context();
560 : bool is_declaration_context();
561 :
562 : // Get the next closure's context on the context chain.
563 : Context closure_context();
564 :
565 : // Returns a JSGlobalProxy object or null.
566 : V8_EXPORT_PRIVATE JSGlobalProxy global_proxy();
567 : void set_global_proxy(JSGlobalProxy global);
568 :
569 : // Get the JSGlobalObject object.
570 : V8_EXPORT_PRIVATE JSGlobalObject global_object();
571 :
572 : // Get the script context by traversing the context chain.
573 : Context script_context();
574 :
575 : // Compute the native context.
576 : inline NativeContext native_context() const;
577 : inline void set_native_context(NativeContext context);
578 :
579 : // Predicates for context types. IsNativeContext is already defined on
580 : // Object.
581 : inline bool IsFunctionContext() const;
582 : inline bool IsCatchContext() const;
583 : inline bool IsWithContext() const;
584 : inline bool IsDebugEvaluateContext() const;
585 : inline bool IsAwaitContext() const;
586 : inline bool IsBlockContext() const;
587 : inline bool IsModuleContext() const;
588 : inline bool IsEvalContext() const;
589 : inline bool IsScriptContext() const;
590 :
591 : inline bool HasSameSecurityTokenAs(Context that) const;
592 :
593 : // The native context also stores a list of all optimized code and a
594 : // list of all deoptimized code, which are needed by the deoptimizer.
595 : V8_EXPORT_PRIVATE void AddOptimizedCode(Code code);
596 : void SetOptimizedCodeListHead(Object head);
597 : Object OptimizedCodeListHead();
598 : void SetDeoptimizedCodeListHead(Object head);
599 : Object DeoptimizedCodeListHead();
600 :
601 : Handle<Object> ErrorMessageForCodeGenerationFromStrings();
602 :
603 : static int IntrinsicIndexForName(Handle<String> name);
604 : static int IntrinsicIndexForName(const unsigned char* name, int length);
605 :
606 : #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
607 : inline void set_##name(type value); \
608 : inline bool is_##name(type value) const; \
609 : inline type name() const;
610 : NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
611 : #undef NATIVE_CONTEXT_FIELD_ACCESSORS
612 :
613 : // Lookup the slot called name, starting with the current context.
614 : // There are three possibilities:
615 : //
616 : // 1) result->IsContext():
617 : // The binding was found in a context. *index is always the
618 : // non-negative slot index. *attributes is NONE for var and let
619 : // declarations, READ_ONLY for const declarations (never ABSENT).
620 : //
621 : // 2) result->IsJSObject():
622 : // The binding was found as a named property in a context extension
623 : // object (i.e., was introduced via eval), as a property on the subject
624 : // of with, or as a property of the global object. *index is -1 and
625 : // *attributes is not ABSENT.
626 : //
627 : // 3) result->IsModule():
628 : // The binding was found in module imports or exports.
629 : // *attributes is never ABSENT. imports are READ_ONLY.
630 : //
631 : // 4) result.is_null():
632 : // There was no binding found, *index is always -1 and *attributes is
633 : // always ABSENT.
634 : static Handle<Object> Lookup(Handle<Context> context, Handle<String> name,
635 : ContextLookupFlags flags, int* index,
636 : PropertyAttributes* attributes,
637 : InitializationFlag* init_flag,
638 : VariableMode* variable_mode,
639 : bool* is_sloppy_function_name = nullptr);
640 :
641 : static inline int FunctionMapIndex(LanguageMode language_mode,
642 : FunctionKind kind, bool has_shared_name,
643 : bool needs_home_object);
644 :
645 : static int ArrayMapIndex(ElementsKind elements_kind) {
646 : DCHECK(IsFastElementsKind(elements_kind));
647 2048963 : return elements_kind + FIRST_JS_ARRAY_MAP_SLOT;
648 : }
649 :
650 : inline Map GetInitialJSArrayMap(ElementsKind kind) const;
651 :
652 : static const int kNotFound = -1;
653 :
654 : // Dispatched behavior.
655 : DECL_PRINTER(Context)
656 : DECL_VERIFIER(Context)
657 :
658 : typedef FlexibleBodyDescriptor<kStartOfTaggedFieldsOffset> BodyDescriptor;
659 :
660 : private:
661 : #ifdef DEBUG
662 : // Bootstrapping-aware type checks.
663 : V8_EXPORT_PRIVATE static bool IsBootstrappingOrNativeContext(Isolate* isolate,
664 : Object object);
665 : static bool IsBootstrappingOrValidParentContext(Object object, Context kid);
666 : #endif
667 :
668 : OBJECT_CONSTRUCTORS(Context, HeapObject);
669 : };
670 :
671 : class NativeContext : public Context {
672 : public:
673 : DECL_CAST(NativeContext)
674 : // TODO(neis): Move some stuff from Context here.
675 :
676 : // [microtask_queue]: pointer to the MicrotaskQueue object.
677 : DECL_PRIMITIVE_ACCESSORS(microtask_queue, MicrotaskQueue*)
678 :
679 : // Dispatched behavior.
680 : DECL_PRINTER(NativeContext)
681 : DECL_VERIFIER(NativeContext)
682 :
683 : // Layout description.
684 : #define NATIVE_CONTEXT_FIELDS_DEF(V) \
685 : /* TODO(ishell): move definition of common context offsets to Context. */ \
686 : V(kStartOfNativeContextFieldsOffset, \
687 : (FIRST_WEAK_SLOT - MIN_CONTEXT_SLOTS) * kTaggedSize) \
688 : V(kEndOfStrongFieldsOffset, 0) \
689 : V(kStartOfWeakFieldsOffset, \
690 : (NATIVE_CONTEXT_SLOTS - FIRST_WEAK_SLOT) * kTaggedSize) \
691 : V(kEndOfWeakFieldsOffset, 0) \
692 : V(kEndOfNativeContextFieldsOffset, 0) \
693 : V(kEndOfTaggedFieldsOffset, 0) \
694 : /* Raw data. */ \
695 : V(kMicrotaskQueueOffset, kSystemPointerSize) \
696 : /* Total size. */ \
697 : V(kSize, 0)
698 :
699 : DEFINE_FIELD_OFFSET_CONSTANTS(Context::kTodoHeaderSize,
700 : NATIVE_CONTEXT_FIELDS_DEF)
701 : #undef NATIVE_CONTEXT_FIELDS_DEF
702 :
703 : class BodyDescriptor;
704 :
705 : private:
706 : STATIC_ASSERT(OffsetOfElementAt(EMBEDDER_DATA_INDEX) ==
707 : Internals::kNativeContextEmbedderDataOffset);
708 :
709 : OBJECT_CONSTRUCTORS(NativeContext, Context);
710 : };
711 :
712 : typedef Context::Field ContextField;
713 :
714 : } // namespace internal
715 : } // namespace v8
716 :
717 : #include "src/objects/object-macros-undef.h"
718 :
719 : #endif // V8_CONTEXTS_H_
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