Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
| 5 | #ifndef V8_CONTEXTS_H_ |
| 6 | #define V8_CONTEXTS_H_ |
| 7 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 8 | #include "src/heap/heap.h" |
| 9 | #include "src/objects.h" |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 10 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | |
| 14 | |
| 15 | enum ContextLookupFlags { |
| 16 | FOLLOW_CONTEXT_CHAIN = 1, |
| 17 | FOLLOW_PROTOTYPE_CHAIN = 2, |
| 18 | |
| 19 | DONT_FOLLOW_CHAINS = 0, |
| 20 | FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN |
| 21 | }; |
| 22 | |
| 23 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 24 | // ES5 10.2 defines lexical environments with mutable and immutable bindings. |
| 25 | // Immutable bindings have two states, initialized and uninitialized, and |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 26 | // their state is changed by the InitializeImmutableBinding method. The |
| 27 | // BindingFlags enum represents information if a binding has definitely been |
| 28 | // initialized. A mutable binding does not need to be checked and thus has |
| 29 | // the BindingFlag MUTABLE_IS_INITIALIZED. |
| 30 | // |
| 31 | // There are two possibilities for immutable bindings |
| 32 | // * 'const' declared variables. They are initialized when evaluating the |
| 33 | // corresponding declaration statement. They need to be checked for being |
| 34 | // initialized and thus get the flag IMMUTABLE_CHECK_INITIALIZED. |
| 35 | // * The function name of a named function literal. The binding is immediately |
| 36 | // initialized when entering the function and thus does not need to be |
| 37 | // checked. it gets the BindingFlag IMMUTABLE_IS_INITIALIZED. |
| 38 | // Accessing an uninitialized binding produces the undefined value. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 39 | // |
| 40 | // The harmony proposal for block scoped bindings also introduces the |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 41 | // uninitialized state for mutable bindings. |
| 42 | // * A 'let' declared variable. They are initialized when evaluating the |
| 43 | // corresponding declaration statement. They need to be checked for being |
| 44 | // initialized and thus get the flag MUTABLE_CHECK_INITIALIZED. |
| 45 | // * A 'var' declared variable. It is initialized immediately upon creation |
| 46 | // and thus doesn't need to be checked. It gets the flag |
| 47 | // MUTABLE_IS_INITIALIZED. |
| 48 | // * Catch bound variables, function parameters and variables introduced by |
| 49 | // function declarations are initialized immediately and do not need to be |
| 50 | // checked. Thus they get the flag MUTABLE_IS_INITIALIZED. |
| 51 | // Immutable bindings in harmony mode get the _HARMONY flag variants. Accessing |
| 52 | // an uninitialized binding produces a reference error. |
| 53 | // |
| 54 | // In V8 uninitialized bindings are set to the hole value upon creation and set |
| 55 | // to a different value upon initialization. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 56 | enum BindingFlags { |
| 57 | MUTABLE_IS_INITIALIZED, |
| 58 | MUTABLE_CHECK_INITIALIZED, |
| 59 | IMMUTABLE_IS_INITIALIZED, |
| 60 | IMMUTABLE_CHECK_INITIALIZED, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 61 | IMMUTABLE_IS_INITIALIZED_HARMONY, |
| 62 | IMMUTABLE_CHECK_INITIALIZED_HARMONY, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 63 | MISSING_BINDING |
| 64 | }; |
| 65 | |
| 66 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 67 | // Heap-allocated activation contexts. |
| 68 | // |
| 69 | // Contexts are implemented as FixedArray objects; the Context |
| 70 | // class is a convenience interface casted on a FixedArray object. |
| 71 | // |
| 72 | // Note: Context must have no virtual functions and Context objects |
| 73 | // must always be allocated via Heap::AllocateContext() or |
| 74 | // Factory::NewContext. |
| 75 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 76 | #define NATIVE_CONTEXT_FIELDS(V) \ |
| 77 | V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ |
| 78 | V(SECURITY_TOKEN_INDEX, Object, security_token) \ |
| 79 | V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ |
| 80 | V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ |
| 81 | V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ |
| 82 | V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ |
| 83 | V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ |
| 84 | V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ |
| 85 | V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ |
| 86 | V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ |
| 87 | V(JS_ARRAY_MAPS_INDEX, Object, js_array_maps) \ |
| 88 | V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ |
| 89 | V(JSON_OBJECT_INDEX, JSObject, json_object) \ |
| 90 | V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ |
| 91 | V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ |
| 92 | V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ |
| 93 | V(CREATE_DATE_FUN_INDEX, JSFunction, create_date_fun) \ |
| 94 | V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \ |
| 95 | V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \ |
| 96 | V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \ |
| 97 | V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \ |
| 98 | V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \ |
| 99 | V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \ |
| 100 | V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \ |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 101 | V(TO_LENGTH_FUN_INDEX, JSFunction, to_length_fun) \ |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 102 | V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ |
| 103 | V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \ |
| 104 | V(CONFIGURE_INSTANCE_FUN_INDEX, JSFunction, configure_instance_fun) \ |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 105 | V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ |
| 106 | V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ |
| 107 | V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ |
| 108 | V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ |
| 109 | V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ |
| 110 | V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ |
| 111 | V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ |
| 112 | V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ |
| 113 | V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ |
| 114 | V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ |
| 115 | V(INT8_ARRAY_EXTERNAL_MAP_INDEX, Map, int8_array_external_map) \ |
| 116 | V(UINT8_ARRAY_EXTERNAL_MAP_INDEX, Map, uint8_array_external_map) \ |
| 117 | V(INT16_ARRAY_EXTERNAL_MAP_INDEX, Map, int16_array_external_map) \ |
| 118 | V(UINT16_ARRAY_EXTERNAL_MAP_INDEX, Map, uint16_array_external_map) \ |
| 119 | V(INT32_ARRAY_EXTERNAL_MAP_INDEX, Map, int32_array_external_map) \ |
| 120 | V(UINT32_ARRAY_EXTERNAL_MAP_INDEX, Map, uint32_array_external_map) \ |
| 121 | V(FLOAT32_ARRAY_EXTERNAL_MAP_INDEX, Map, float32_array_external_map) \ |
| 122 | V(FLOAT64_ARRAY_EXTERNAL_MAP_INDEX, Map, float64_array_external_map) \ |
| 123 | V(UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX, Map, \ |
| 124 | uint8_clamped_array_external_map) \ |
| 125 | V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ |
| 126 | V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ |
| 127 | V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ |
| 128 | sloppy_function_with_readonly_prototype_map) \ |
| 129 | V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ |
| 130 | V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ |
| 131 | sloppy_function_without_prototype_map) \ |
| 132 | V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ |
| 133 | strict_function_without_prototype_map) \ |
| 134 | V(BOUND_FUNCTION_MAP_INDEX, Map, bound_function_map) \ |
| 135 | V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ |
| 136 | V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ |
| 137 | V(ALIASED_ARGUMENTS_MAP_INDEX, Map, aliased_arguments_map) \ |
| 138 | V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ |
| 139 | V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \ |
| 140 | V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \ |
| 141 | V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \ |
| 142 | V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun) \ |
| 143 | V(FUNCTION_CACHE_INDEX, JSObject, function_cache) \ |
| 144 | V(JSFUNCTION_RESULT_CACHES_INDEX, FixedArray, jsfunction_result_caches) \ |
| 145 | V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ |
| 146 | V(RUNTIME_CONTEXT_INDEX, Context, runtime_context) \ |
| 147 | V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ |
| 148 | V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ |
| 149 | call_as_constructor_delegate) \ |
| 150 | V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ |
| 151 | V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ |
| 152 | V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ |
| 153 | V(MAP_CACHE_INDEX, Object, map_cache) \ |
| 154 | V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ |
| 155 | V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ |
| 156 | V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ |
| 157 | error_message_for_code_gen_from_strings) \ |
| 158 | V(IS_PROMISE_INDEX, JSFunction, is_promise) \ |
| 159 | V(PROMISE_CREATE_INDEX, JSFunction, promise_create) \ |
| 160 | V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \ |
| 161 | V(PROMISE_REJECT_INDEX, JSFunction, promise_reject) \ |
| 162 | V(PROMISE_CHAIN_INDEX, JSFunction, promise_chain) \ |
| 163 | V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ |
| 164 | V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ |
| 165 | V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \ |
| 166 | to_complete_property_descriptor) \ |
| 167 | V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \ |
| 168 | V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ |
| 169 | V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) \ |
| 170 | V(PROXY_ENUMERATE_INDEX, JSFunction, proxy_enumerate) \ |
| 171 | V(OBSERVERS_NOTIFY_CHANGE_INDEX, JSFunction, observers_notify_change) \ |
| 172 | V(OBSERVERS_ENQUEUE_SPLICE_INDEX, JSFunction, observers_enqueue_splice) \ |
| 173 | V(OBSERVERS_BEGIN_SPLICE_INDEX, JSFunction, observers_begin_perform_splice) \ |
| 174 | V(OBSERVERS_END_SPLICE_INDEX, JSFunction, observers_end_perform_splice) \ |
| 175 | V(NATIVE_OBJECT_OBSERVE_INDEX, JSFunction, native_object_observe) \ |
| 176 | V(NATIVE_OBJECT_GET_NOTIFIER_INDEX, JSFunction, native_object_get_notifier) \ |
| 177 | V(NATIVE_OBJECT_NOTIFIER_PERFORM_CHANGE, JSFunction, \ |
| 178 | native_object_notifier_perform_change) \ |
| 179 | V(SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, Map, sloppy_generator_function_map) \ |
| 180 | V(STRICT_GENERATOR_FUNCTION_MAP_INDEX, Map, strict_generator_function_map) \ |
| 181 | V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ |
| 182 | V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ |
| 183 | V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \ |
| 184 | V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map) \ |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 185 | V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ |
| 186 | V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) |
| 187 | |
| 188 | |
| 189 | // A table of all script contexts. Every loaded top-level script with top-level |
| 190 | // lexical declarations contributes its ScriptContext into this table. |
| 191 | // |
| 192 | // The table is a fixed array, its first slot is the current used count and |
| 193 | // the subsequent slots 1..used contain ScriptContexts. |
| 194 | class ScriptContextTable : public FixedArray { |
| 195 | public: |
| 196 | // Conversions. |
| 197 | static ScriptContextTable* cast(Object* context) { |
| 198 | DCHECK(context->IsScriptContextTable()); |
| 199 | return reinterpret_cast<ScriptContextTable*>(context); |
| 200 | } |
| 201 | |
| 202 | struct LookupResult { |
| 203 | int context_index; |
| 204 | int slot_index; |
| 205 | VariableMode mode; |
| 206 | InitializationFlag init_flag; |
| 207 | MaybeAssignedFlag maybe_assigned_flag; |
| 208 | }; |
| 209 | |
| 210 | int used() const { return Smi::cast(get(kUsedSlot))->value(); } |
| 211 | |
| 212 | void set_used(int used) { set(kUsedSlot, Smi::FromInt(used)); } |
| 213 | |
| 214 | static Handle<Context> GetContext(Handle<ScriptContextTable> table, int i) { |
| 215 | DCHECK(i < table->used()); |
| 216 | return Handle<Context>::cast(FixedArray::get(table, i + 1)); |
| 217 | } |
| 218 | |
| 219 | // Lookup a variable `name` in a ScriptContextTable. |
| 220 | // If it returns true, the variable is found and `result` contains |
| 221 | // valid information about its location. |
| 222 | // If it returns false, `result` is untouched. |
| 223 | MUST_USE_RESULT |
| 224 | static bool Lookup(Handle<ScriptContextTable> table, Handle<String> name, |
| 225 | LookupResult* result); |
| 226 | |
| 227 | MUST_USE_RESULT |
| 228 | static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, |
| 229 | Handle<Context> script_context); |
| 230 | |
| 231 | static int GetContextOffset(int context_index) { |
| 232 | return kFirstContextOffset + context_index * kPointerSize; |
| 233 | } |
| 234 | |
| 235 | private: |
| 236 | static const int kUsedSlot = 0; |
| 237 | static const int kFirstContextOffset = |
| 238 | FixedArray::kHeaderSize + (kUsedSlot + 1) * kPointerSize; |
| 239 | |
| 240 | DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); |
| 241 | }; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 242 | |
| 243 | // JSFunctions are pairs (context, function code), sometimes also called |
| 244 | // closures. A Context object is used to represent function contexts and |
| 245 | // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). |
| 246 | // |
| 247 | // At runtime, the contexts build a stack in parallel to the execution |
| 248 | // stack, with the top-most context being the current context. All contexts |
| 249 | // have the following slots: |
| 250 | // |
| 251 | // [ closure ] This is the current function. It is the same for all |
| 252 | // contexts inside a function. It provides access to the |
| 253 | // incoming context (i.e., the outer context, which may |
| 254 | // or may not become the current function's context), and |
| 255 | // it provides access to the functions code and thus it's |
| 256 | // scope information, which in turn contains the names of |
| 257 | // statically allocated context slots. The names are needed |
| 258 | // for dynamic lookups in the presence of 'with' or 'eval'. |
| 259 | // |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 260 | // [ previous ] A pointer to the previous context. It is NULL for |
| 261 | // function contexts, and non-NULL for 'with' contexts. |
| 262 | // Used to implement the 'with' statement. |
| 263 | // |
| 264 | // [ extension ] A pointer to an extension JSObject, or NULL. Used to |
| 265 | // implement 'with' statements and dynamic declarations |
| 266 | // (through 'eval'). The object in a 'with' statement is |
| 267 | // stored in the extension slot of a 'with' context. |
| 268 | // Dynamically declared variables/functions are also added |
| 269 | // to lazily allocated extension object. Context::Lookup |
| 270 | // searches the extension object for properties. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 271 | // For global and block contexts, contains the respective |
| 272 | // ScopeInfo. |
| 273 | // For module contexts, points back to the respective JSModule. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 274 | // |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 275 | // [ global_object ] A pointer to the global object. Provided for quick |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 276 | // access to the global object from inside the code (since |
| 277 | // we always have a context pointer). |
| 278 | // |
| 279 | // In addition, function contexts may have statically allocated context slots |
| 280 | // to store local variables/functions that are accessed from inner functions |
| 281 | // (via static context addresses) or through 'eval' (dynamic context lookups). |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 282 | // The native context contains additional slots for fast access to native |
| 283 | // properties. |
| 284 | // |
| 285 | // Finally, with Harmony scoping, the JSFunction representing a top level |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 286 | // script will have the ScriptContext rather than a FunctionContext. |
| 287 | // Script contexts from all top-level scripts are gathered in |
| 288 | // ScriptContextTable. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 289 | |
| 290 | class Context: public FixedArray { |
| 291 | public: |
| 292 | // Conversions. |
| 293 | static Context* cast(Object* context) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 294 | DCHECK(context->IsContext()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 295 | return reinterpret_cast<Context*>(context); |
| 296 | } |
| 297 | |
| 298 | // The default context slot layout; indices are FixedArray slot indices. |
| 299 | enum { |
| 300 | // These slots are in all contexts. |
| 301 | CLOSURE_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 302 | PREVIOUS_INDEX, |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 303 | // The extension slot is used for either the global object (in global |
| 304 | // contexts), eval extension object (function contexts), subject of with |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 305 | // (with contexts), or the variable name (catch contexts), the serialized |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 306 | // scope info (block contexts), or the module instance (module contexts). |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 307 | EXTENSION_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 308 | GLOBAL_OBJECT_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 309 | MIN_CONTEXT_SLOTS, |
| 310 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 311 | // This slot holds the thrown value in catch contexts. |
| 312 | THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, |
| 313 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 314 | // These slots are only in native contexts. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 315 | GLOBAL_PROXY_INDEX = MIN_CONTEXT_SLOTS, |
| 316 | SECURITY_TOKEN_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 317 | SLOPPY_ARGUMENTS_MAP_INDEX, |
| 318 | ALIASED_ARGUMENTS_MAP_INDEX, |
| 319 | STRICT_ARGUMENTS_MAP_INDEX, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 320 | REGEXP_RESULT_MAP_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 321 | SLOPPY_FUNCTION_MAP_INDEX, |
| 322 | SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, |
| 323 | STRICT_FUNCTION_MAP_INDEX, |
| 324 | SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, |
| 325 | STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, |
| 326 | BOUND_FUNCTION_MAP_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 327 | INITIAL_OBJECT_PROTOTYPE_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 328 | INITIAL_ARRAY_PROTOTYPE_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 329 | BOOLEAN_FUNCTION_INDEX, |
| 330 | NUMBER_FUNCTION_INDEX, |
| 331 | STRING_FUNCTION_INDEX, |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 332 | STRING_FUNCTION_PROTOTYPE_MAP_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 333 | SYMBOL_FUNCTION_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 334 | OBJECT_FUNCTION_INDEX, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 335 | INTERNAL_ARRAY_FUNCTION_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 336 | ARRAY_FUNCTION_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 337 | JS_ARRAY_MAPS_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 338 | DATE_FUNCTION_INDEX, |
| 339 | JSON_OBJECT_INDEX, |
| 340 | REGEXP_FUNCTION_INDEX, |
| 341 | CREATE_DATE_FUN_INDEX, |
| 342 | TO_NUMBER_FUN_INDEX, |
| 343 | TO_STRING_FUN_INDEX, |
| 344 | TO_DETAIL_STRING_FUN_INDEX, |
| 345 | TO_OBJECT_FUN_INDEX, |
| 346 | TO_INTEGER_FUN_INDEX, |
| 347 | TO_UINT32_FUN_INDEX, |
| 348 | TO_INT32_FUN_INDEX, |
| 349 | TO_BOOLEAN_FUN_INDEX, |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 350 | GLOBAL_EVAL_FUN_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 351 | INSTANTIATE_FUN_INDEX, |
| 352 | CONFIGURE_INSTANCE_FUN_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 353 | ARRAY_BUFFER_FUN_INDEX, |
| 354 | UINT8_ARRAY_FUN_INDEX, |
| 355 | INT8_ARRAY_FUN_INDEX, |
| 356 | UINT16_ARRAY_FUN_INDEX, |
| 357 | INT16_ARRAY_FUN_INDEX, |
| 358 | UINT32_ARRAY_FUN_INDEX, |
| 359 | INT32_ARRAY_FUN_INDEX, |
| 360 | FLOAT32_ARRAY_FUN_INDEX, |
| 361 | FLOAT64_ARRAY_FUN_INDEX, |
| 362 | UINT8_CLAMPED_ARRAY_FUN_INDEX, |
| 363 | INT8_ARRAY_EXTERNAL_MAP_INDEX, |
| 364 | UINT8_ARRAY_EXTERNAL_MAP_INDEX, |
| 365 | INT16_ARRAY_EXTERNAL_MAP_INDEX, |
| 366 | UINT16_ARRAY_EXTERNAL_MAP_INDEX, |
| 367 | INT32_ARRAY_EXTERNAL_MAP_INDEX, |
| 368 | UINT32_ARRAY_EXTERNAL_MAP_INDEX, |
| 369 | FLOAT32_ARRAY_EXTERNAL_MAP_INDEX, |
| 370 | FLOAT64_ARRAY_EXTERNAL_MAP_INDEX, |
| 371 | UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX, |
| 372 | DATA_VIEW_FUN_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 373 | MESSAGE_LISTENERS_INDEX, |
| 374 | MAKE_MESSAGE_FUN_INDEX, |
| 375 | GET_STACK_TRACE_LINE_INDEX, |
| 376 | CONFIGURE_GLOBAL_INDEX, |
| 377 | FUNCTION_CACHE_INDEX, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 378 | JSFUNCTION_RESULT_CACHES_INDEX, |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 379 | NORMALIZED_MAP_CACHE_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 380 | RUNTIME_CONTEXT_INDEX, |
| 381 | CALL_AS_FUNCTION_DELEGATE_INDEX, |
| 382 | CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 383 | SCRIPT_FUNCTION_INDEX, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 384 | OPAQUE_REFERENCE_FUNCTION_INDEX, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 385 | CONTEXT_EXTENSION_FUNCTION_INDEX, |
| 386 | OUT_OF_MEMORY_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 387 | EMBEDDER_DATA_INDEX, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 388 | ALLOW_CODE_GEN_FROM_STRINGS_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 389 | ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, |
| 390 | RUN_MICROTASKS_INDEX, |
| 391 | ENQUEUE_MICROTASK_INDEX, |
| 392 | IS_PROMISE_INDEX, |
| 393 | PROMISE_CREATE_INDEX, |
| 394 | PROMISE_RESOLVE_INDEX, |
| 395 | PROMISE_REJECT_INDEX, |
| 396 | PROMISE_CHAIN_INDEX, |
| 397 | PROMISE_CATCH_INDEX, |
| 398 | PROMISE_THEN_INDEX, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 399 | TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 400 | DERIVED_HAS_TRAP_INDEX, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 401 | DERIVED_GET_TRAP_INDEX, |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 402 | DERIVED_SET_TRAP_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 403 | PROXY_ENUMERATE_INDEX, |
| 404 | OBSERVERS_NOTIFY_CHANGE_INDEX, |
| 405 | OBSERVERS_ENQUEUE_SPLICE_INDEX, |
| 406 | OBSERVERS_BEGIN_SPLICE_INDEX, |
| 407 | OBSERVERS_END_SPLICE_INDEX, |
| 408 | NATIVE_OBJECT_OBSERVE_INDEX, |
| 409 | NATIVE_OBJECT_GET_NOTIFIER_INDEX, |
| 410 | NATIVE_OBJECT_NOTIFIER_PERFORM_CHANGE, |
| 411 | SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, |
| 412 | STRICT_GENERATOR_FUNCTION_MAP_INDEX, |
| 413 | GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, |
| 414 | ITERATOR_RESULT_MAP_INDEX, |
| 415 | MAP_ITERATOR_MAP_INDEX, |
| 416 | SET_ITERATOR_MAP_INDEX, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 417 | ARRAY_VALUES_ITERATOR_INDEX, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 418 | SCRIPT_CONTEXT_TABLE_INDEX, |
| 419 | MAP_CACHE_INDEX, |
| 420 | TO_LENGTH_FUN_INDEX, |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 421 | |
| 422 | // Properties from here are treated as weak references by the full GC. |
| 423 | // Scavenge treats them as strong references. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 424 | OPTIMIZED_FUNCTIONS_LIST, // Weak. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 425 | OPTIMIZED_CODE_LIST, // Weak. |
| 426 | DEOPTIMIZED_CODE_LIST, // Weak. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 427 | NEXT_CONTEXT_LINK, // Weak. |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 428 | |
| 429 | // Total number of slots. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 430 | NATIVE_CONTEXT_SLOTS, |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 431 | FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 432 | }; |
| 433 | |
| 434 | // Direct slot access. |
| 435 | JSFunction* closure() { return JSFunction::cast(get(CLOSURE_INDEX)); } |
| 436 | void set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); } |
| 437 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 438 | Context* previous() { |
| 439 | Object* result = unchecked_previous(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 440 | DCHECK(IsBootstrappingOrValidParentContext(result, this)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 441 | return reinterpret_cast<Context*>(result); |
| 442 | } |
| 443 | void set_previous(Context* context) { set(PREVIOUS_INDEX, context); } |
| 444 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 445 | bool has_extension() { return extension() != NULL; } |
| 446 | Object* extension() { return get(EXTENSION_INDEX); } |
| 447 | void set_extension(Object* object) { set(EXTENSION_INDEX, object); } |
| 448 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 449 | JSModule* module() { return JSModule::cast(get(EXTENSION_INDEX)); } |
| 450 | void set_module(JSModule* module) { set(EXTENSION_INDEX, module); } |
| 451 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 452 | // Get the context where var declarations will be hoisted to, which |
| 453 | // may be the context itself. |
| 454 | Context* declaration_context(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 455 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 456 | GlobalObject* global_object() { |
| 457 | Object* result = get(GLOBAL_OBJECT_INDEX); |
| 458 | DCHECK(IsBootstrappingOrGlobalObject(this->GetIsolate(), result)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 459 | return reinterpret_cast<GlobalObject*>(result); |
| 460 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 461 | void set_global_object(GlobalObject* object) { |
| 462 | set(GLOBAL_OBJECT_INDEX, object); |
| 463 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 464 | |
| 465 | // Returns a JSGlobalProxy object or null. |
| 466 | JSObject* global_proxy(); |
| 467 | void set_global_proxy(JSObject* global); |
| 468 | |
| 469 | // The builtins object. |
| 470 | JSBuiltinsObject* builtins(); |
| 471 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 472 | // Get the script context by traversing the context chain. |
| 473 | Context* script_context(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 474 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 475 | // Compute the native context by traversing the context chain. |
| 476 | Context* native_context(); |
| 477 | |
| 478 | // Predicates for context types. IsNativeContext is also defined on Object |
| 479 | // because we frequently have to know if arbitrary objects are natives |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 480 | // contexts. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 481 | bool IsNativeContext() { |
| 482 | Map* map = this->map(); |
| 483 | return map == map->GetHeap()->native_context_map(); |
| 484 | } |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 485 | bool IsFunctionContext() { |
| 486 | Map* map = this->map(); |
| 487 | return map == map->GetHeap()->function_context_map(); |
| 488 | } |
| 489 | bool IsCatchContext() { |
| 490 | Map* map = this->map(); |
| 491 | return map == map->GetHeap()->catch_context_map(); |
| 492 | } |
| 493 | bool IsWithContext() { |
| 494 | Map* map = this->map(); |
| 495 | return map == map->GetHeap()->with_context_map(); |
| 496 | } |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 497 | bool IsBlockContext() { |
| 498 | Map* map = this->map(); |
| 499 | return map == map->GetHeap()->block_context_map(); |
| 500 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 501 | bool IsModuleContext() { |
| 502 | Map* map = this->map(); |
| 503 | return map == map->GetHeap()->module_context_map(); |
| 504 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 505 | bool IsScriptContext() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 506 | Map* map = this->map(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 507 | return map == map->GetHeap()->script_context_map(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 508 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 509 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 510 | bool HasSameSecurityTokenAs(Context* that) { |
| 511 | return this->global_object()->native_context()->security_token() == |
| 512 | that->global_object()->native_context()->security_token(); |
| 513 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 514 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 515 | // A native context holds a list of all functions with optimized code. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 516 | void AddOptimizedFunction(JSFunction* function); |
| 517 | void RemoveOptimizedFunction(JSFunction* function); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 518 | void SetOptimizedFunctionsListHead(Object* head); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 519 | Object* OptimizedFunctionsListHead(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 520 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 521 | // The native context also stores a list of all optimized code and a |
| 522 | // list of all deoptimized code, which are needed by the deoptimizer. |
| 523 | void AddOptimizedCode(Code* code); |
| 524 | void SetOptimizedCodeListHead(Object* head); |
| 525 | Object* OptimizedCodeListHead(); |
| 526 | void SetDeoptimizedCodeListHead(Object* head); |
| 527 | Object* DeoptimizedCodeListHead(); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 528 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 529 | Handle<Object> ErrorMessageForCodeGenerationFromStrings(); |
| 530 | |
| 531 | #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 532 | void set_##name(type* value) { \ |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 533 | DCHECK(IsNativeContext()); \ |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 534 | set(index, value); \ |
| 535 | } \ |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 536 | bool is_##name(type* value) { \ |
| 537 | DCHECK(IsNativeContext()); \ |
| 538 | return type::cast(get(index)) == value; \ |
| 539 | } \ |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 540 | type* name() { \ |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 541 | DCHECK(IsNativeContext()); \ |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 542 | return type::cast(get(index)); \ |
| 543 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 544 | NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) |
| 545 | #undef NATIVE_CONTEXT_FIELD_ACCESSORS |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 546 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 547 | // Lookup the slot called name, starting with the current context. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 548 | // There are three possibilities: |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 549 | // |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 550 | // 1) result->IsContext(): |
| 551 | // The binding was found in a context. *index is always the |
| 552 | // non-negative slot index. *attributes is NONE for var and let |
| 553 | // declarations, READ_ONLY for const declarations (never ABSENT). |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 554 | // |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 555 | // 2) result->IsJSObject(): |
| 556 | // The binding was found as a named property in a context extension |
| 557 | // object (i.e., was introduced via eval), as a property on the subject |
| 558 | // of with, or as a property of the global object. *index is -1 and |
| 559 | // *attributes is not ABSENT. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 560 | // |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 561 | // 3) result.is_null(): |
| 562 | // There was no binding found, *index is always -1 and *attributes is |
| 563 | // always ABSENT. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 564 | Handle<Object> Lookup(Handle<String> name, |
| 565 | ContextLookupFlags flags, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 566 | int* index, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 567 | PropertyAttributes* attributes, |
| 568 | BindingFlags* binding_flags); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 569 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 570 | // Code generation support. |
| 571 | static int SlotOffset(int index) { |
| 572 | return kHeaderSize + index * kPointerSize - kHeapObjectTag; |
| 573 | } |
| 574 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 575 | static int FunctionMapIndex(StrictMode strict_mode, FunctionKind kind) { |
| 576 | if (IsGeneratorFunction(kind)) { |
| 577 | return strict_mode == SLOPPY ? SLOPPY_GENERATOR_FUNCTION_MAP_INDEX |
| 578 | : STRICT_GENERATOR_FUNCTION_MAP_INDEX; |
| 579 | } |
| 580 | |
| 581 | if (IsArrowFunction(kind) || IsConciseMethod(kind)) { |
| 582 | return strict_mode == SLOPPY |
| 583 | ? SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX |
| 584 | : STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; |
| 585 | } |
| 586 | |
| 587 | return strict_mode == SLOPPY ? SLOPPY_FUNCTION_MAP_INDEX |
| 588 | : STRICT_FUNCTION_MAP_INDEX; |
| 589 | } |
| 590 | |
| 591 | static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 592 | |
| 593 | // GC support. |
| 594 | typedef FixedBodyDescriptor< |
| 595 | kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; |
| 596 | |
| 597 | typedef FixedBodyDescriptor< |
| 598 | kHeaderSize, |
| 599 | kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, |
| 600 | kSize> MarkCompactBodyDescriptor; |
| 601 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 602 | private: |
| 603 | // Unchecked access to the slots. |
| 604 | Object* unchecked_previous() { return get(PREVIOUS_INDEX); } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 605 | |
| 606 | #ifdef DEBUG |
| 607 | // Bootstrapping-aware type checks. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 608 | static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); |
| 609 | static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 610 | #endif |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 611 | |
| 612 | STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); |
| 613 | STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 614 | }; |
| 615 | |
| 616 | } } // namespace v8::internal |
| 617 | |
| 618 | #endif // V8_CONTEXTS_H_ |