Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1 | // Copyright 2014 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 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 5 | #include "src/runtime/runtime-utils.h" |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 6 | |
| 7 | #include "src/accessors.h" |
| 8 | #include "src/arguments.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 9 | #include "src/ast/scopeinfo.h" |
| 10 | #include "src/ast/scopes.h" |
| 11 | #include "src/deoptimizer.h" |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 12 | #include "src/frames-inl.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 13 | #include "src/isolate-inl.h" |
| 14 | #include "src/messages.h" |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 15 | |
| 16 | namespace v8 { |
| 17 | namespace internal { |
| 18 | |
| 19 | static Object* ThrowRedeclarationError(Isolate* isolate, Handle<String> name) { |
| 20 | HandleScope scope(isolate); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 21 | THROW_NEW_ERROR_RETURN_FAILURE( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 22 | isolate, NewTypeError(MessageTemplate::kVarRedeclaration, name)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 23 | } |
| 24 | |
| 25 | |
| 26 | RUNTIME_FUNCTION(Runtime_ThrowConstAssignError) { |
| 27 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 28 | THROW_NEW_ERROR_RETURN_FAILURE(isolate, |
| 29 | NewTypeError(MessageTemplate::kConstAssign)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | |
| 33 | // May throw a RedeclarationError. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 34 | static Object* DeclareGlobals(Isolate* isolate, Handle<JSGlobalObject> global, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 35 | Handle<String> name, Handle<Object> value, |
| 36 | PropertyAttributes attr, bool is_var, |
| 37 | bool is_const, bool is_function) { |
| 38 | Handle<ScriptContextTable> script_contexts( |
| 39 | global->native_context()->script_context_table()); |
| 40 | ScriptContextTable::LookupResult lookup; |
| 41 | if (ScriptContextTable::Lookup(script_contexts, name, &lookup) && |
| 42 | IsLexicalVariableMode(lookup.mode)) { |
| 43 | return ThrowRedeclarationError(isolate, name); |
| 44 | } |
| 45 | |
| 46 | // Do the lookup own properties only, see ES5 erratum. |
| 47 | LookupIterator it(global, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR); |
| 48 | Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 49 | if (!maybe.IsJust()) return isolate->heap()->exception(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 50 | |
| 51 | if (it.IsFound()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 52 | PropertyAttributes old_attributes = maybe.FromJust(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 53 | // The name was declared before; check for conflicting re-declarations. |
| 54 | if (is_const) return ThrowRedeclarationError(isolate, name); |
| 55 | |
| 56 | // Skip var re-declarations. |
| 57 | if (is_var) return isolate->heap()->undefined_value(); |
| 58 | |
| 59 | DCHECK(is_function); |
| 60 | if ((old_attributes & DONT_DELETE) != 0) { |
| 61 | // Only allow reconfiguring globals to functions in user code (no |
| 62 | // natives, which are marked as read-only). |
| 63 | DCHECK((attr & READ_ONLY) == 0); |
| 64 | |
| 65 | // Check whether we can reconfigure the existing property into a |
| 66 | // function. |
| 67 | PropertyDetails old_details = it.property_details(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 68 | // TODO(verwaest): ACCESSOR_CONSTANT invalidly includes |
| 69 | // ExecutableAccessInfo, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 70 | // which are actually data properties, not accessor properties. |
| 71 | if (old_details.IsReadOnly() || old_details.IsDontEnum() || |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 72 | old_details.type() == ACCESSOR_CONSTANT) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 73 | return ThrowRedeclarationError(isolate, name); |
| 74 | } |
| 75 | // If the existing property is not configurable, keep its attributes. Do |
| 76 | attr = old_attributes; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | // Define or redefine own property. |
| 81 | RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( |
| 82 | global, name, value, attr)); |
| 83 | |
| 84 | return isolate->heap()->undefined_value(); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | RUNTIME_FUNCTION(Runtime_DeclareGlobals) { |
| 89 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 90 | DCHECK_EQ(2, args.length()); |
| 91 | Handle<JSGlobalObject> global(isolate->global_object()); |
| 92 | Handle<Context> context(isolate->context()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 93 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 94 | CONVERT_ARG_HANDLE_CHECKED(FixedArray, pairs, 0); |
| 95 | CONVERT_SMI_ARG_CHECKED(flags, 1); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 96 | |
| 97 | // Traverse the name/value pairs and set the properties. |
| 98 | int length = pairs->length(); |
| 99 | for (int i = 0; i < length; i += 2) { |
| 100 | HandleScope scope(isolate); |
| 101 | Handle<String> name(String::cast(pairs->get(i))); |
| 102 | Handle<Object> initial_value(pairs->get(i + 1), isolate); |
| 103 | |
| 104 | // We have to declare a global const property. To capture we only |
| 105 | // assign to it when evaluating the assignment for "const x = |
| 106 | // <expr>" the initial value is the hole. |
| 107 | bool is_var = initial_value->IsUndefined(); |
| 108 | bool is_const = initial_value->IsTheHole(); |
| 109 | bool is_function = initial_value->IsSharedFunctionInfo(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 110 | DCHECK_EQ(1, |
| 111 | BoolToInt(is_var) + BoolToInt(is_const) + BoolToInt(is_function)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 112 | |
| 113 | Handle<Object> value; |
| 114 | if (is_function) { |
| 115 | // Copy the function and update its context. Use it as value. |
| 116 | Handle<SharedFunctionInfo> shared = |
| 117 | Handle<SharedFunctionInfo>::cast(initial_value); |
| 118 | Handle<JSFunction> function = |
| 119 | isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context, |
| 120 | TENURED); |
| 121 | value = function; |
| 122 | } else { |
| 123 | value = isolate->factory()->undefined_value(); |
| 124 | } |
| 125 | |
| 126 | // Compute the property attributes. According to ECMA-262, |
| 127 | // the property must be non-configurable except in eval. |
| 128 | bool is_native = DeclareGlobalsNativeFlag::decode(flags); |
| 129 | bool is_eval = DeclareGlobalsEvalFlag::decode(flags); |
| 130 | int attr = NONE; |
| 131 | if (is_const) attr |= READ_ONLY; |
| 132 | if (is_function && is_native) attr |= READ_ONLY; |
| 133 | if (!is_const && !is_eval) attr |= DONT_DELETE; |
| 134 | |
| 135 | Object* result = DeclareGlobals(isolate, global, name, value, |
| 136 | static_cast<PropertyAttributes>(attr), |
| 137 | is_var, is_const, is_function); |
| 138 | if (isolate->has_pending_exception()) return result; |
| 139 | } |
| 140 | |
| 141 | return isolate->heap()->undefined_value(); |
| 142 | } |
| 143 | |
| 144 | |
| 145 | RUNTIME_FUNCTION(Runtime_InitializeVarGlobal) { |
| 146 | HandleScope scope(isolate); |
| 147 | // args[0] == name |
| 148 | // args[1] == language_mode |
| 149 | // args[2] == value (optional) |
| 150 | |
| 151 | // Determine if we need to assign to the variable if it already |
| 152 | // exists (based on the number of arguments). |
| 153 | RUNTIME_ASSERT(args.length() == 3); |
| 154 | |
| 155 | CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 156 | CONVERT_LANGUAGE_MODE_ARG_CHECKED(language_mode, 1); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 157 | CONVERT_ARG_HANDLE_CHECKED(Object, value, 2); |
| 158 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 159 | Handle<JSGlobalObject> global(isolate->context()->global_object()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 160 | Handle<Object> result; |
| 161 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 162 | isolate, result, Object::SetProperty(global, name, value, language_mode)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 163 | return *result; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | RUNTIME_FUNCTION(Runtime_InitializeConstGlobal) { |
| 168 | HandleScope handle_scope(isolate); |
| 169 | // All constants are declared with an initial value. The name |
| 170 | // of the constant is the first argument and the initial value |
| 171 | // is the second. |
| 172 | RUNTIME_ASSERT(args.length() == 2); |
| 173 | CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| 174 | CONVERT_ARG_HANDLE_CHECKED(Object, value, 1); |
| 175 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 176 | Handle<JSGlobalObject> global = isolate->global_object(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 177 | |
| 178 | // Lookup the property as own on the global object. |
| 179 | LookupIterator it(global, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR); |
| 180 | Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 181 | DCHECK(maybe.IsJust()); |
| 182 | PropertyAttributes old_attributes = maybe.FromJust(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 183 | |
| 184 | PropertyAttributes attr = |
| 185 | static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY); |
| 186 | // Set the value if the property is either missing, or the property attributes |
| 187 | // allow setting the value without invoking an accessor. |
| 188 | if (it.IsFound()) { |
| 189 | // Ignore if we can't reconfigure the value. |
| 190 | if ((old_attributes & DONT_DELETE) != 0) { |
| 191 | if ((old_attributes & READ_ONLY) != 0 || |
| 192 | it.state() == LookupIterator::ACCESSOR) { |
| 193 | return *value; |
| 194 | } |
| 195 | attr = static_cast<PropertyAttributes>(old_attributes | READ_ONLY); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( |
| 200 | global, name, value, attr)); |
| 201 | |
| 202 | return *value; |
| 203 | } |
| 204 | |
| 205 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 206 | namespace { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 207 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 208 | Object* DeclareLookupSlot(Isolate* isolate, Handle<String> name, |
| 209 | Handle<Object> initial_value, |
| 210 | PropertyAttributes attr) { |
| 211 | // Declarations are always made in a function, eval or script context, or |
| 212 | // a declaration block scope. |
| 213 | // In the case of eval code, the context passed is the context of the caller, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 214 | // which may be some nested context and not the declaration context. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 215 | Handle<Context> context_arg(isolate->context(), isolate); |
| 216 | Handle<Context> context(context_arg->declaration_context(), isolate); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 217 | |
| 218 | // TODO(verwaest): Unify the encoding indicating "var" with DeclareGlobals. |
| 219 | bool is_var = *initial_value == NULL; |
| 220 | bool is_const = initial_value->IsTheHole(); |
| 221 | bool is_function = initial_value->IsJSFunction(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 222 | DCHECK_EQ(1, |
| 223 | BoolToInt(is_var) + BoolToInt(is_const) + BoolToInt(is_function)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 224 | |
| 225 | int index; |
| 226 | PropertyAttributes attributes; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 227 | BindingFlags binding_flags; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 228 | |
| 229 | if ((attr & EVAL_DECLARED) != 0) { |
| 230 | // Check for a conflict with a lexically scoped variable |
| 231 | context_arg->Lookup(name, LEXICAL_TEST, &index, &attributes, |
| 232 | &binding_flags); |
| 233 | if (attributes != ABSENT && |
| 234 | (binding_flags == MUTABLE_CHECK_INITIALIZED || |
| 235 | binding_flags == IMMUTABLE_CHECK_INITIALIZED || |
| 236 | binding_flags == IMMUTABLE_CHECK_INITIALIZED_HARMONY)) { |
| 237 | return ThrowRedeclarationError(isolate, name); |
| 238 | } |
| 239 | attr = static_cast<PropertyAttributes>(attr & ~EVAL_DECLARED); |
| 240 | } |
| 241 | |
| 242 | Handle<Object> holder = context->Lookup(name, DONT_FOLLOW_CHAINS, &index, |
| 243 | &attributes, &binding_flags); |
| 244 | if (holder.is_null()) { |
| 245 | // In case of JSProxy, an exception might have been thrown. |
| 246 | if (isolate->has_pending_exception()) return isolate->heap()->exception(); |
| 247 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 248 | |
| 249 | Handle<JSObject> object; |
| 250 | Handle<Object> value = |
| 251 | is_function ? initial_value |
| 252 | : Handle<Object>::cast(isolate->factory()->undefined_value()); |
| 253 | |
| 254 | // TODO(verwaest): This case should probably not be covered by this function, |
| 255 | // but by DeclareGlobals instead. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 256 | if (attributes != ABSENT && holder->IsJSGlobalObject()) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 257 | return DeclareGlobals(isolate, Handle<JSGlobalObject>::cast(holder), name, |
| 258 | value, attr, is_var, is_const, is_function); |
| 259 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 260 | if (context_arg->extension()->IsJSGlobalObject()) { |
| 261 | Handle<JSGlobalObject> global( |
| 262 | JSGlobalObject::cast(context_arg->extension()), isolate); |
| 263 | return DeclareGlobals(isolate, global, name, value, attr, is_var, is_const, |
| 264 | is_function); |
| 265 | } else if (context->IsScriptContext()) { |
| 266 | DCHECK(context->global_object()->IsJSGlobalObject()); |
| 267 | Handle<JSGlobalObject> global( |
| 268 | JSGlobalObject::cast(context->global_object()), isolate); |
| 269 | return DeclareGlobals(isolate, global, name, value, attr, is_var, is_const, |
| 270 | is_function); |
| 271 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 272 | |
| 273 | if (attributes != ABSENT) { |
| 274 | // The name was declared before; check for conflicting re-declarations. |
| 275 | if (is_const || (attributes & READ_ONLY) != 0) { |
| 276 | return ThrowRedeclarationError(isolate, name); |
| 277 | } |
| 278 | |
| 279 | // Skip var re-declarations. |
| 280 | if (is_var) return isolate->heap()->undefined_value(); |
| 281 | |
| 282 | DCHECK(is_function); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 283 | if (index != Context::kNotFound) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 284 | DCHECK(holder.is_identical_to(context)); |
| 285 | context->set(index, *initial_value); |
| 286 | return isolate->heap()->undefined_value(); |
| 287 | } |
| 288 | |
| 289 | object = Handle<JSObject>::cast(holder); |
| 290 | |
| 291 | } else if (context->has_extension()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 292 | // Sloppy varblock contexts might not have an extension object yet, |
| 293 | // in which case their extension is a ScopeInfo. |
| 294 | if (context->extension()->IsScopeInfo()) { |
| 295 | DCHECK(context->IsBlockContext()); |
| 296 | object = isolate->factory()->NewJSObject( |
| 297 | isolate->context_extension_function()); |
| 298 | Handle<HeapObject> extension = |
| 299 | isolate->factory()->NewSloppyBlockWithEvalContextExtension( |
| 300 | handle(context->scope_info()), object); |
| 301 | context->set_extension(*extension); |
| 302 | } else { |
| 303 | object = handle(context->extension_object(), isolate); |
| 304 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 305 | DCHECK(object->IsJSContextExtensionObject() || object->IsJSGlobalObject()); |
| 306 | } else { |
| 307 | DCHECK(context->IsFunctionContext()); |
| 308 | object = |
| 309 | isolate->factory()->NewJSObject(isolate->context_extension_function()); |
| 310 | context->set_extension(*object); |
| 311 | } |
| 312 | |
| 313 | RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( |
| 314 | object, name, value, attr)); |
| 315 | |
| 316 | return isolate->heap()->undefined_value(); |
| 317 | } |
| 318 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 319 | } // namespace |
| 320 | |
| 321 | |
| 322 | RUNTIME_FUNCTION(Runtime_DeclareLookupSlot) { |
| 323 | HandleScope scope(isolate); |
| 324 | DCHECK_EQ(3, args.length()); |
| 325 | CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| 326 | CONVERT_ARG_HANDLE_CHECKED(Object, initial_value, 1); |
| 327 | CONVERT_ARG_HANDLE_CHECKED(Smi, property_attributes, 2); |
| 328 | |
| 329 | PropertyAttributes attributes = |
| 330 | static_cast<PropertyAttributes>(property_attributes->value()); |
| 331 | return DeclareLookupSlot(isolate, name, initial_value, attributes); |
| 332 | } |
| 333 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 334 | |
| 335 | RUNTIME_FUNCTION(Runtime_InitializeLegacyConstLookupSlot) { |
| 336 | HandleScope scope(isolate); |
| 337 | DCHECK(args.length() == 3); |
| 338 | |
| 339 | CONVERT_ARG_HANDLE_CHECKED(Object, value, 0); |
| 340 | DCHECK(!value->IsTheHole()); |
| 341 | // Initializations are always done in a function or native context. |
| 342 | CONVERT_ARG_HANDLE_CHECKED(Context, context_arg, 1); |
| 343 | Handle<Context> context(context_arg->declaration_context()); |
| 344 | CONVERT_ARG_HANDLE_CHECKED(String, name, 2); |
| 345 | |
| 346 | int index; |
| 347 | PropertyAttributes attributes; |
| 348 | ContextLookupFlags flags = DONT_FOLLOW_CHAINS; |
| 349 | BindingFlags binding_flags; |
| 350 | Handle<Object> holder = |
| 351 | context->Lookup(name, flags, &index, &attributes, &binding_flags); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 352 | if (holder.is_null()) { |
| 353 | // In case of JSProxy, an exception might have been thrown. |
| 354 | if (isolate->has_pending_exception()) return isolate->heap()->exception(); |
| 355 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 356 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 357 | if (index != Context::kNotFound) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 358 | DCHECK(holder->IsContext()); |
| 359 | // Property was found in a context. Perform the assignment if the constant |
| 360 | // was uninitialized. |
| 361 | Handle<Context> context = Handle<Context>::cast(holder); |
| 362 | DCHECK((attributes & READ_ONLY) != 0); |
| 363 | if (context->get(index)->IsTheHole()) context->set(index, *value); |
| 364 | return *value; |
| 365 | } |
| 366 | |
| 367 | PropertyAttributes attr = |
| 368 | static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY); |
| 369 | |
| 370 | // Strict mode handling not needed (legacy const is disallowed in strict |
| 371 | // mode). |
| 372 | |
| 373 | // The declared const was configurable, and may have been deleted in the |
| 374 | // meanwhile. If so, re-introduce the variable in the context extension. |
| 375 | if (attributes == ABSENT) { |
| 376 | Handle<Context> declaration_context(context_arg->declaration_context()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 377 | if (declaration_context->IsScriptContext()) { |
| 378 | holder = handle(declaration_context->global_object(), isolate); |
| 379 | } else { |
| 380 | holder = handle(declaration_context->extension_object(), isolate); |
| 381 | DCHECK(!holder.is_null()); |
| 382 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 383 | CHECK(holder->IsJSObject()); |
| 384 | } else { |
| 385 | // For JSContextExtensionObjects, the initializer can be run multiple times |
| 386 | // if in a for loop: for (var i = 0; i < 2; i++) { const x = i; }. Only the |
| 387 | // first assignment should go through. For JSGlobalObjects, additionally any |
| 388 | // code can run in between that modifies the declared property. |
| 389 | DCHECK(holder->IsJSGlobalObject() || holder->IsJSContextExtensionObject()); |
| 390 | |
| 391 | LookupIterator it(holder, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR); |
| 392 | Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 393 | if (!maybe.IsJust()) return isolate->heap()->exception(); |
| 394 | PropertyAttributes old_attributes = maybe.FromJust(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 395 | |
| 396 | // Ignore if we can't reconfigure the value. |
| 397 | if ((old_attributes & DONT_DELETE) != 0) { |
| 398 | if ((old_attributes & READ_ONLY) != 0 || |
| 399 | it.state() == LookupIterator::ACCESSOR) { |
| 400 | return *value; |
| 401 | } |
| 402 | attr = static_cast<PropertyAttributes>(old_attributes | READ_ONLY); |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | RETURN_FAILURE_ON_EXCEPTION( |
| 407 | isolate, JSObject::SetOwnPropertyIgnoreAttributes( |
| 408 | Handle<JSObject>::cast(holder), name, value, attr)); |
| 409 | |
| 410 | return *value; |
| 411 | } |
| 412 | |
| 413 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 414 | namespace { |
| 415 | |
| 416 | // Find the arguments of the JavaScript function invocation that called |
| 417 | // into C++ code. Collect these in a newly allocated array of handles (possibly |
| 418 | // prefixed by a number of empty handles). |
| 419 | base::SmartArrayPointer<Handle<Object>> GetCallerArguments(Isolate* isolate, |
| 420 | int prefix_argc, |
| 421 | int* total_argc) { |
| 422 | // Find frame containing arguments passed to the caller. |
| 423 | JavaScriptFrameIterator it(isolate); |
| 424 | JavaScriptFrame* frame = it.frame(); |
| 425 | List<JSFunction*> functions(2); |
| 426 | frame->GetFunctions(&functions); |
| 427 | if (functions.length() > 1) { |
| 428 | int inlined_jsframe_index = functions.length() - 1; |
| 429 | TranslatedState translated_values(frame); |
| 430 | translated_values.Prepare(false, frame->fp()); |
| 431 | |
| 432 | int argument_count = 0; |
| 433 | TranslatedFrame* translated_frame = |
| 434 | translated_values.GetArgumentsInfoFromJSFrameIndex( |
| 435 | inlined_jsframe_index, &argument_count); |
| 436 | TranslatedFrame::iterator iter = translated_frame->begin(); |
| 437 | |
| 438 | // Skip the function. |
| 439 | iter++; |
| 440 | |
| 441 | // Skip the receiver. |
| 442 | iter++; |
| 443 | argument_count--; |
| 444 | |
| 445 | *total_argc = prefix_argc + argument_count; |
| 446 | base::SmartArrayPointer<Handle<Object>> param_data( |
| 447 | NewArray<Handle<Object>>(*total_argc)); |
| 448 | bool should_deoptimize = false; |
| 449 | for (int i = 0; i < argument_count; i++) { |
| 450 | should_deoptimize = should_deoptimize || iter->IsMaterializedObject(); |
| 451 | Handle<Object> value = iter->GetValue(); |
| 452 | param_data[prefix_argc + i] = value; |
| 453 | iter++; |
| 454 | } |
| 455 | |
| 456 | if (should_deoptimize) { |
| 457 | translated_values.StoreMaterializedValuesAndDeopt(); |
| 458 | } |
| 459 | |
| 460 | return param_data; |
| 461 | } else { |
| 462 | it.AdvanceToArgumentsFrame(); |
| 463 | frame = it.frame(); |
| 464 | int args_count = frame->ComputeParametersCount(); |
| 465 | |
| 466 | *total_argc = prefix_argc + args_count; |
| 467 | base::SmartArrayPointer<Handle<Object>> param_data( |
| 468 | NewArray<Handle<Object>>(*total_argc)); |
| 469 | for (int i = 0; i < args_count; i++) { |
| 470 | Handle<Object> val = Handle<Object>(frame->GetParameter(i), isolate); |
| 471 | param_data[prefix_argc + i] = val; |
| 472 | } |
| 473 | return param_data; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | |
| 478 | template <typename T> |
| 479 | Handle<JSObject> NewSloppyArguments(Isolate* isolate, Handle<JSFunction> callee, |
| 480 | T parameters, int argument_count) { |
| 481 | CHECK(!IsSubclassConstructor(callee->shared()->kind())); |
| 482 | DCHECK(callee->shared()->has_simple_parameters()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 483 | Handle<JSObject> result = |
| 484 | isolate->factory()->NewArgumentsObject(callee, argument_count); |
| 485 | |
| 486 | // Allocate the elements if needed. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 487 | int parameter_count = callee->shared()->internal_formal_parameter_count(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 488 | if (argument_count > 0) { |
| 489 | if (parameter_count > 0) { |
| 490 | int mapped_count = Min(argument_count, parameter_count); |
| 491 | Handle<FixedArray> parameter_map = |
| 492 | isolate->factory()->NewFixedArray(mapped_count + 2, NOT_TENURED); |
| 493 | parameter_map->set_map(isolate->heap()->sloppy_arguments_elements_map()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 494 | result->set_map(isolate->native_context()->fast_aliased_arguments_map()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 495 | result->set_elements(*parameter_map); |
| 496 | |
| 497 | // Store the context and the arguments array at the beginning of the |
| 498 | // parameter map. |
| 499 | Handle<Context> context(isolate->context()); |
| 500 | Handle<FixedArray> arguments = |
| 501 | isolate->factory()->NewFixedArray(argument_count, NOT_TENURED); |
| 502 | parameter_map->set(0, *context); |
| 503 | parameter_map->set(1, *arguments); |
| 504 | |
| 505 | // Loop over the actual parameters backwards. |
| 506 | int index = argument_count - 1; |
| 507 | while (index >= mapped_count) { |
| 508 | // These go directly in the arguments array and have no |
| 509 | // corresponding slot in the parameter map. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 510 | arguments->set(index, parameters[index]); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 511 | --index; |
| 512 | } |
| 513 | |
| 514 | Handle<ScopeInfo> scope_info(callee->shared()->scope_info()); |
| 515 | while (index >= 0) { |
| 516 | // Detect duplicate names to the right in the parameter list. |
| 517 | Handle<String> name(scope_info->ParameterName(index)); |
| 518 | int context_local_count = scope_info->ContextLocalCount(); |
| 519 | bool duplicate = false; |
| 520 | for (int j = index + 1; j < parameter_count; ++j) { |
| 521 | if (scope_info->ParameterName(j) == *name) { |
| 522 | duplicate = true; |
| 523 | break; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | if (duplicate) { |
| 528 | // This goes directly in the arguments array with a hole in the |
| 529 | // parameter map. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 530 | arguments->set(index, parameters[index]); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 531 | parameter_map->set_the_hole(index + 2); |
| 532 | } else { |
| 533 | // The context index goes in the parameter map with a hole in the |
| 534 | // arguments array. |
| 535 | int context_index = -1; |
| 536 | for (int j = 0; j < context_local_count; ++j) { |
| 537 | if (scope_info->ContextLocalName(j) == *name) { |
| 538 | context_index = j; |
| 539 | break; |
| 540 | } |
| 541 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 542 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 543 | DCHECK(context_index >= 0); |
| 544 | arguments->set_the_hole(index); |
| 545 | parameter_map->set( |
| 546 | index + 2, |
| 547 | Smi::FromInt(Context::MIN_CONTEXT_SLOTS + context_index)); |
| 548 | } |
| 549 | |
| 550 | --index; |
| 551 | } |
| 552 | } else { |
| 553 | // If there is no aliasing, the arguments object elements are not |
| 554 | // special in any way. |
| 555 | Handle<FixedArray> elements = |
| 556 | isolate->factory()->NewFixedArray(argument_count, NOT_TENURED); |
| 557 | result->set_elements(*elements); |
| 558 | for (int i = 0; i < argument_count; ++i) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 559 | elements->set(i, parameters[i]); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 560 | } |
| 561 | } |
| 562 | } |
| 563 | return result; |
| 564 | } |
| 565 | |
| 566 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 567 | template <typename T> |
| 568 | Handle<JSObject> NewStrictArguments(Isolate* isolate, Handle<JSFunction> callee, |
| 569 | T parameters, int argument_count) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 570 | Handle<JSObject> result = |
| 571 | isolate->factory()->NewArgumentsObject(callee, argument_count); |
| 572 | |
| 573 | if (argument_count > 0) { |
| 574 | Handle<FixedArray> array = |
| 575 | isolate->factory()->NewUninitializedFixedArray(argument_count); |
| 576 | DisallowHeapAllocation no_gc; |
| 577 | WriteBarrierMode mode = array->GetWriteBarrierMode(no_gc); |
| 578 | for (int i = 0; i < argument_count; i++) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 579 | array->set(i, parameters[i], mode); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 580 | } |
| 581 | result->set_elements(*array); |
| 582 | } |
| 583 | return result; |
| 584 | } |
| 585 | |
| 586 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 587 | template <typename T> |
| 588 | Handle<JSObject> NewRestArguments(Isolate* isolate, Handle<JSFunction> callee, |
| 589 | T parameters, int argument_count, |
| 590 | int start_index) { |
| 591 | int num_elements = std::max(0, argument_count - start_index); |
| 592 | Handle<JSObject> result = isolate->factory()->NewJSArray( |
| 593 | FAST_ELEMENTS, num_elements, num_elements, Strength::WEAK, |
| 594 | DONT_INITIALIZE_ARRAY_ELEMENTS); |
| 595 | { |
| 596 | DisallowHeapAllocation no_gc; |
| 597 | FixedArray* elements = FixedArray::cast(result->elements()); |
| 598 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
| 599 | for (int i = 0; i < num_elements; i++) { |
| 600 | elements->set(i, parameters[i + start_index], mode); |
| 601 | } |
| 602 | } |
| 603 | return result; |
| 604 | } |
| 605 | |
| 606 | |
| 607 | class HandleArguments BASE_EMBEDDED { |
| 608 | public: |
| 609 | explicit HandleArguments(Handle<Object>* array) : array_(array) {} |
| 610 | Object* operator[](int index) { return *array_[index]; } |
| 611 | |
| 612 | private: |
| 613 | Handle<Object>* array_; |
| 614 | }; |
| 615 | |
| 616 | |
| 617 | class ParameterArguments BASE_EMBEDDED { |
| 618 | public: |
| 619 | explicit ParameterArguments(Object** parameters) : parameters_(parameters) {} |
| 620 | Object*& operator[](int index) { return *(parameters_ - index - 1); } |
| 621 | |
| 622 | private: |
| 623 | Object** parameters_; |
| 624 | }; |
| 625 | |
| 626 | } // namespace |
| 627 | |
| 628 | |
| 629 | RUNTIME_FUNCTION(Runtime_NewSloppyArguments_Generic) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 630 | HandleScope scope(isolate); |
| 631 | DCHECK(args.length() == 1); |
| 632 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 633 | // This generic runtime function can also be used when the caller has been |
| 634 | // inlined, we use the slow but accurate {GetCallerArguments}. |
| 635 | int argument_count = 0; |
| 636 | base::SmartArrayPointer<Handle<Object>> arguments = |
| 637 | GetCallerArguments(isolate, 0, &argument_count); |
| 638 | HandleArguments argument_getter(arguments.get()); |
| 639 | return *NewSloppyArguments(isolate, callee, argument_getter, argument_count); |
| 640 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 641 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 642 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 643 | RUNTIME_FUNCTION(Runtime_NewStrictArguments_Generic) { |
| 644 | HandleScope scope(isolate); |
| 645 | DCHECK(args.length() == 1); |
| 646 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
| 647 | // This generic runtime function can also be used when the caller has been |
| 648 | // inlined, we use the slow but accurate {GetCallerArguments}. |
| 649 | int argument_count = 0; |
| 650 | base::SmartArrayPointer<Handle<Object>> arguments = |
| 651 | GetCallerArguments(isolate, 0, &argument_count); |
| 652 | HandleArguments argument_getter(arguments.get()); |
| 653 | return *NewStrictArguments(isolate, callee, argument_getter, argument_count); |
| 654 | } |
| 655 | |
| 656 | |
| 657 | RUNTIME_FUNCTION(Runtime_NewRestArguments_Generic) { |
| 658 | HandleScope scope(isolate); |
| 659 | DCHECK(args.length() == 2); |
| 660 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0) |
| 661 | CONVERT_SMI_ARG_CHECKED(start_index, 1); |
| 662 | // This generic runtime function can also be used when the caller has been |
| 663 | // inlined, we use the slow but accurate {GetCallerArguments}. |
| 664 | int argument_count = 0; |
| 665 | base::SmartArrayPointer<Handle<Object>> arguments = |
| 666 | GetCallerArguments(isolate, 0, &argument_count); |
| 667 | HandleArguments argument_getter(arguments.get()); |
| 668 | return *NewRestArguments(isolate, callee, argument_getter, argument_count, |
| 669 | start_index); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | |
| 673 | RUNTIME_FUNCTION(Runtime_NewSloppyArguments) { |
| 674 | HandleScope scope(isolate); |
| 675 | DCHECK(args.length() == 3); |
| 676 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
| 677 | Object** parameters = reinterpret_cast<Object**>(args[1]); |
| 678 | CONVERT_SMI_ARG_CHECKED(argument_count, 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 679 | #ifdef DEBUG |
| 680 | // This runtime function does not materialize the correct arguments when the |
| 681 | // caller has been inlined, better make sure we are not hitting that case. |
| 682 | JavaScriptFrameIterator it(isolate); |
| 683 | DCHECK(!it.frame()->HasInlinedFrames()); |
| 684 | #endif // DEBUG |
| 685 | ParameterArguments argument_getter(parameters); |
| 686 | return *NewSloppyArguments(isolate, callee, argument_getter, argument_count); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | |
| 690 | RUNTIME_FUNCTION(Runtime_NewStrictArguments) { |
| 691 | HandleScope scope(isolate); |
| 692 | DCHECK(args.length() == 3); |
| 693 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0) |
| 694 | Object** parameters = reinterpret_cast<Object**>(args[1]); |
| 695 | CONVERT_SMI_ARG_CHECKED(argument_count, 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 696 | #ifdef DEBUG |
| 697 | // This runtime function does not materialize the correct arguments when the |
| 698 | // caller has been inlined, better make sure we are not hitting that case. |
| 699 | JavaScriptFrameIterator it(isolate); |
| 700 | DCHECK(!it.frame()->HasInlinedFrames()); |
| 701 | #endif // DEBUG |
| 702 | ParameterArguments argument_getter(parameters); |
| 703 | return *NewStrictArguments(isolate, callee, argument_getter, argument_count); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 707 | RUNTIME_FUNCTION(Runtime_NewRestParam) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 708 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 709 | DCHECK(args.length() == 3); |
| 710 | CONVERT_SMI_ARG_CHECKED(num_params, 0); |
| 711 | Object** parameters = reinterpret_cast<Object**>(args[1]); |
| 712 | CONVERT_SMI_ARG_CHECKED(rest_index, 2); |
| 713 | #ifdef DEBUG |
| 714 | // This runtime function does not materialize the correct arguments when the |
| 715 | // caller has been inlined, better make sure we are not hitting that case. |
| 716 | JavaScriptFrameIterator it(isolate); |
| 717 | DCHECK(!it.frame()->HasInlinedFrames()); |
| 718 | #endif // DEBUG |
| 719 | Handle<JSFunction> callee; |
| 720 | ParameterArguments argument_getter(parameters); |
| 721 | return *NewRestArguments(isolate, callee, argument_getter, num_params, |
| 722 | rest_index); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 723 | } |
| 724 | |
| 725 | |
| 726 | RUNTIME_FUNCTION(Runtime_NewClosure) { |
| 727 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 728 | DCHECK_EQ(1, args.length()); |
| 729 | CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0); |
| 730 | Handle<Context> context(isolate->context(), isolate); |
| 731 | return *isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context, |
| 732 | NOT_TENURED); |
| 733 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 734 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 735 | |
| 736 | RUNTIME_FUNCTION(Runtime_NewClosure_Tenured) { |
| 737 | HandleScope scope(isolate); |
| 738 | DCHECK_EQ(1, args.length()); |
| 739 | CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0); |
| 740 | Handle<Context> context(isolate->context(), isolate); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 741 | // The caller ensures that we pretenure closures that are assigned |
| 742 | // directly to properties. |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 743 | return *isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 744 | TENURED); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | static Object* FindNameClash(Handle<ScopeInfo> scope_info, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 748 | Handle<JSGlobalObject> global_object, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 749 | Handle<ScriptContextTable> script_context) { |
| 750 | Isolate* isolate = scope_info->GetIsolate(); |
| 751 | for (int var = 0; var < scope_info->ContextLocalCount(); var++) { |
| 752 | Handle<String> name(scope_info->ContextLocalName(var)); |
| 753 | VariableMode mode = scope_info->ContextLocalMode(var); |
| 754 | ScriptContextTable::LookupResult lookup; |
| 755 | if (ScriptContextTable::Lookup(script_context, name, &lookup)) { |
| 756 | if (IsLexicalVariableMode(mode) || IsLexicalVariableMode(lookup.mode)) { |
| 757 | return ThrowRedeclarationError(isolate, name); |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | if (IsLexicalVariableMode(mode)) { |
| 762 | LookupIterator it(global_object, name, |
| 763 | LookupIterator::HIDDEN_SKIP_INTERCEPTOR); |
| 764 | Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 765 | if (!maybe.IsJust()) return isolate->heap()->exception(); |
| 766 | if ((maybe.FromJust() & DONT_DELETE) != 0) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 767 | return ThrowRedeclarationError(isolate, name); |
| 768 | } |
| 769 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 770 | JSGlobalObject::InvalidatePropertyCell(global_object, name); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 771 | } |
| 772 | } |
| 773 | return isolate->heap()->undefined_value(); |
| 774 | } |
| 775 | |
| 776 | |
| 777 | RUNTIME_FUNCTION(Runtime_NewScriptContext) { |
| 778 | HandleScope scope(isolate); |
| 779 | DCHECK(args.length() == 2); |
| 780 | |
| 781 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 782 | CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 783 | Handle<JSGlobalObject> global_object(function->context()->global_object()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 784 | Handle<Context> native_context(global_object->native_context()); |
| 785 | Handle<ScriptContextTable> script_context_table( |
| 786 | native_context->script_context_table()); |
| 787 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 788 | Object* name_clash_result = |
| 789 | FindNameClash(scope_info, global_object, script_context_table); |
| 790 | if (isolate->has_pending_exception()) return name_clash_result; |
| 791 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 792 | // Script contexts have a canonical empty function as their closure, not the |
| 793 | // anonymous closure containing the global code. See |
| 794 | // FullCodeGenerator::PushFunctionArgumentForContextAllocation. |
| 795 | Handle<JSFunction> closure( |
| 796 | function->shared()->IsBuiltin() ? *function : native_context->closure()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 797 | Handle<Context> result = |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 798 | isolate->factory()->NewScriptContext(closure, scope_info); |
| 799 | |
| 800 | result->InitializeGlobalSlots(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 801 | |
| 802 | DCHECK(function->context() == isolate->context()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 803 | DCHECK(*global_object == result->global_object()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 804 | |
| 805 | Handle<ScriptContextTable> new_script_context_table = |
| 806 | ScriptContextTable::Extend(script_context_table, result); |
| 807 | native_context->set_script_context_table(*new_script_context_table); |
| 808 | return *result; |
| 809 | } |
| 810 | |
| 811 | |
| 812 | RUNTIME_FUNCTION(Runtime_NewFunctionContext) { |
| 813 | HandleScope scope(isolate); |
| 814 | DCHECK(args.length() == 1); |
| 815 | |
| 816 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| 817 | |
| 818 | DCHECK(function->context() == isolate->context()); |
| 819 | int length = function->shared()->scope_info()->ContextLength(); |
| 820 | return *isolate->factory()->NewFunctionContext(length, function); |
| 821 | } |
| 822 | |
| 823 | |
| 824 | RUNTIME_FUNCTION(Runtime_PushWithContext) { |
| 825 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 826 | DCHECK_EQ(2, args.length()); |
| 827 | CONVERT_ARG_HANDLE_CHECKED(JSReceiver, extension_object, 0); |
| 828 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 829 | Handle<Context> current(isolate->context()); |
| 830 | Handle<Context> context = |
| 831 | isolate->factory()->NewWithContext(function, current, extension_object); |
| 832 | isolate->set_context(*context); |
| 833 | return *context; |
| 834 | } |
| 835 | |
| 836 | |
| 837 | RUNTIME_FUNCTION(Runtime_PushCatchContext) { |
| 838 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 839 | DCHECK_EQ(3, args.length()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 840 | CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| 841 | CONVERT_ARG_HANDLE_CHECKED(Object, thrown_object, 1); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 842 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 2); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 843 | Handle<Context> current(isolate->context()); |
| 844 | Handle<Context> context = isolate->factory()->NewCatchContext( |
| 845 | function, current, name, thrown_object); |
| 846 | isolate->set_context(*context); |
| 847 | return *context; |
| 848 | } |
| 849 | |
| 850 | |
| 851 | RUNTIME_FUNCTION(Runtime_PushBlockContext) { |
| 852 | HandleScope scope(isolate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 853 | DCHECK_EQ(2, args.length()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 854 | CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 855 | CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 856 | Handle<Context> current(isolate->context()); |
| 857 | Handle<Context> context = |
| 858 | isolate->factory()->NewBlockContext(function, current, scope_info); |
| 859 | isolate->set_context(*context); |
| 860 | return *context; |
| 861 | } |
| 862 | |
| 863 | |
| 864 | RUNTIME_FUNCTION(Runtime_IsJSModule) { |
| 865 | SealHandleScope shs(isolate); |
| 866 | DCHECK(args.length() == 1); |
| 867 | CONVERT_ARG_CHECKED(Object, obj, 0); |
| 868 | return isolate->heap()->ToBoolean(obj->IsJSModule()); |
| 869 | } |
| 870 | |
| 871 | |
| 872 | RUNTIME_FUNCTION(Runtime_PushModuleContext) { |
| 873 | SealHandleScope shs(isolate); |
| 874 | DCHECK(args.length() == 2); |
| 875 | CONVERT_SMI_ARG_CHECKED(index, 0); |
| 876 | |
| 877 | if (!args[1]->IsScopeInfo()) { |
| 878 | // Module already initialized. Find hosting context and retrieve context. |
| 879 | Context* host = Context::cast(isolate->context())->script_context(); |
| 880 | Context* context = Context::cast(host->get(index)); |
| 881 | DCHECK(context->previous() == isolate->context()); |
| 882 | isolate->set_context(context); |
| 883 | return context; |
| 884 | } |
| 885 | |
| 886 | CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1); |
| 887 | |
| 888 | // Allocate module context. |
| 889 | HandleScope scope(isolate); |
| 890 | Factory* factory = isolate->factory(); |
| 891 | Handle<Context> context = factory->NewModuleContext(scope_info); |
| 892 | Handle<JSModule> module = factory->NewJSModule(context, scope_info); |
| 893 | context->set_module(*module); |
| 894 | Context* previous = isolate->context(); |
| 895 | context->set_previous(previous); |
| 896 | context->set_closure(previous->closure()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 897 | context->set_native_context(previous->native_context()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 898 | isolate->set_context(*context); |
| 899 | |
| 900 | // Find hosting scope and initialize internal variable holding module there. |
| 901 | previous->script_context()->set(index, *context); |
| 902 | |
| 903 | return *context; |
| 904 | } |
| 905 | |
| 906 | |
| 907 | RUNTIME_FUNCTION(Runtime_DeclareModules) { |
| 908 | HandleScope scope(isolate); |
| 909 | DCHECK(args.length() == 1); |
| 910 | CONVERT_ARG_HANDLE_CHECKED(FixedArray, descriptions, 0); |
| 911 | Context* host_context = isolate->context(); |
| 912 | |
| 913 | for (int i = 0; i < descriptions->length(); ++i) { |
| 914 | Handle<ModuleInfo> description(ModuleInfo::cast(descriptions->get(i))); |
| 915 | int host_index = description->host_index(); |
| 916 | Handle<Context> context(Context::cast(host_context->get(host_index))); |
| 917 | Handle<JSModule> module(context->module()); |
| 918 | |
| 919 | for (int j = 0; j < description->length(); ++j) { |
| 920 | Handle<String> name(description->name(j)); |
| 921 | VariableMode mode = description->mode(j); |
| 922 | int index = description->index(j); |
| 923 | switch (mode) { |
| 924 | case VAR: |
| 925 | case LET: |
| 926 | case CONST: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 927 | case CONST_LEGACY: |
| 928 | case IMPORT: { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 929 | PropertyAttributes attr = |
| 930 | IsImmutableVariableMode(mode) ? FROZEN : SEALED; |
| 931 | Handle<AccessorInfo> info = |
| 932 | Accessors::MakeModuleExport(name, index, attr); |
| 933 | Handle<Object> result = |
| 934 | JSObject::SetAccessor(module, info).ToHandleChecked(); |
| 935 | DCHECK(!result->IsUndefined()); |
| 936 | USE(result); |
| 937 | break; |
| 938 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 939 | case TEMPORARY: |
| 940 | case DYNAMIC: |
| 941 | case DYNAMIC_GLOBAL: |
| 942 | case DYNAMIC_LOCAL: |
| 943 | UNREACHABLE(); |
| 944 | } |
| 945 | } |
| 946 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 947 | if (JSObject::PreventExtensions(module, Object::THROW_ON_ERROR) |
| 948 | .IsNothing()) { |
| 949 | DCHECK(false); |
| 950 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 951 | } |
| 952 | |
| 953 | DCHECK(!isolate->has_pending_exception()); |
| 954 | return isolate->heap()->undefined_value(); |
| 955 | } |
| 956 | |
| 957 | |
| 958 | RUNTIME_FUNCTION(Runtime_DeleteLookupSlot) { |
| 959 | HandleScope scope(isolate); |
| 960 | DCHECK(args.length() == 2); |
| 961 | |
| 962 | CONVERT_ARG_HANDLE_CHECKED(Context, context, 0); |
| 963 | CONVERT_ARG_HANDLE_CHECKED(String, name, 1); |
| 964 | |
| 965 | int index; |
| 966 | PropertyAttributes attributes; |
| 967 | ContextLookupFlags flags = FOLLOW_CHAINS; |
| 968 | BindingFlags binding_flags; |
| 969 | Handle<Object> holder = |
| 970 | context->Lookup(name, flags, &index, &attributes, &binding_flags); |
| 971 | |
| 972 | // If the slot was not found the result is true. |
| 973 | if (holder.is_null()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 974 | // In case of JSProxy, an exception might have been thrown. |
| 975 | if (isolate->has_pending_exception()) return isolate->heap()->exception(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 976 | return isolate->heap()->true_value(); |
| 977 | } |
| 978 | |
| 979 | // If the slot was found in a context, it should be DONT_DELETE. |
| 980 | if (holder->IsContext()) { |
| 981 | return isolate->heap()->false_value(); |
| 982 | } |
| 983 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 984 | // The slot was found in a JSReceiver, either a context extension object, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 985 | // the global object, or the subject of a with. Try to delete it |
| 986 | // (respecting DONT_DELETE). |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 987 | Handle<JSReceiver> object = Handle<JSReceiver>::cast(holder); |
| 988 | Maybe<bool> result = JSReceiver::DeleteProperty(object, name); |
| 989 | MAYBE_RETURN(result, isolate->heap()->exception()); |
| 990 | return isolate->heap()->ToBoolean(result.FromJust()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 991 | } |
| 992 | |
| 993 | |
| 994 | static Object* ComputeReceiverForNonGlobal(Isolate* isolate, JSObject* holder) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 995 | DCHECK(!holder->IsJSGlobalObject()); |
| 996 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 997 | // If the holder isn't a context extension object, we just return it |
| 998 | // as the receiver. This allows arguments objects to be used as |
| 999 | // receivers, but only if they are put in the context scope chain |
| 1000 | // explicitly via a with-statement. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1001 | if (holder->map()->instance_type() != JS_CONTEXT_EXTENSION_OBJECT_TYPE) { |
| 1002 | return holder; |
| 1003 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1004 | // Fall back to using the global object as the implicit receiver if |
| 1005 | // the property turns out to be a local variable allocated in a |
| 1006 | // context extension object - introduced via eval. |
| 1007 | return isolate->heap()->undefined_value(); |
| 1008 | } |
| 1009 | |
| 1010 | |
| 1011 | static ObjectPair LoadLookupSlotHelper(Arguments args, Isolate* isolate, |
| 1012 | bool throw_error) { |
| 1013 | HandleScope scope(isolate); |
| 1014 | DCHECK_EQ(2, args.length()); |
| 1015 | |
| 1016 | if (!args[0]->IsContext() || !args[1]->IsString()) { |
| 1017 | return MakePair(isolate->ThrowIllegalOperation(), NULL); |
| 1018 | } |
| 1019 | Handle<Context> context = args.at<Context>(0); |
| 1020 | Handle<String> name = args.at<String>(1); |
| 1021 | |
| 1022 | int index; |
| 1023 | PropertyAttributes attributes; |
| 1024 | ContextLookupFlags flags = FOLLOW_CHAINS; |
| 1025 | BindingFlags binding_flags; |
| 1026 | Handle<Object> holder = |
| 1027 | context->Lookup(name, flags, &index, &attributes, &binding_flags); |
| 1028 | if (isolate->has_pending_exception()) { |
| 1029 | return MakePair(isolate->heap()->exception(), NULL); |
| 1030 | } |
| 1031 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1032 | if (index != Context::kNotFound) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1033 | DCHECK(holder->IsContext()); |
| 1034 | // If the "property" we were looking for is a local variable, the |
| 1035 | // receiver is the global object; see ECMA-262, 3rd., 10.1.6 and 10.2.3. |
| 1036 | Handle<Object> receiver = isolate->factory()->undefined_value(); |
| 1037 | Object* value = Context::cast(*holder)->get(index); |
| 1038 | // Check for uninitialized bindings. |
| 1039 | switch (binding_flags) { |
| 1040 | case MUTABLE_CHECK_INITIALIZED: |
| 1041 | case IMMUTABLE_CHECK_INITIALIZED_HARMONY: |
| 1042 | if (value->IsTheHole()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1043 | Handle<Object> error = isolate->factory()->NewReferenceError( |
| 1044 | MessageTemplate::kNotDefined, name); |
| 1045 | isolate->Throw(*error); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1046 | return MakePair(isolate->heap()->exception(), NULL); |
| 1047 | } |
| 1048 | // FALLTHROUGH |
| 1049 | case MUTABLE_IS_INITIALIZED: |
| 1050 | case IMMUTABLE_IS_INITIALIZED: |
| 1051 | case IMMUTABLE_IS_INITIALIZED_HARMONY: |
| 1052 | DCHECK(!value->IsTheHole()); |
| 1053 | return MakePair(value, *receiver); |
| 1054 | case IMMUTABLE_CHECK_INITIALIZED: |
| 1055 | if (value->IsTheHole()) { |
| 1056 | DCHECK((attributes & READ_ONLY) != 0); |
| 1057 | value = isolate->heap()->undefined_value(); |
| 1058 | } |
| 1059 | return MakePair(value, *receiver); |
| 1060 | case MISSING_BINDING: |
| 1061 | UNREACHABLE(); |
| 1062 | return MakePair(NULL, NULL); |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | // Otherwise, if the slot was found the holder is a context extension |
| 1067 | // object, subject of a with, or a global object. We read the named |
| 1068 | // property from it. |
| 1069 | if (!holder.is_null()) { |
| 1070 | Handle<JSReceiver> object = Handle<JSReceiver>::cast(holder); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1071 | // GetProperty below can cause GC. |
| 1072 | Handle<Object> receiver_handle( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1073 | object->IsJSGlobalObject() |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1074 | ? Object::cast(isolate->heap()->undefined_value()) |
| 1075 | : object->IsJSProxy() ? static_cast<Object*>(*object) |
| 1076 | : ComputeReceiverForNonGlobal( |
| 1077 | isolate, JSObject::cast(*object)), |
| 1078 | isolate); |
| 1079 | |
| 1080 | // No need to unhole the value here. This is taken care of by the |
| 1081 | // GetProperty function. |
| 1082 | Handle<Object> value; |
| 1083 | ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| 1084 | isolate, value, Object::GetProperty(object, name), |
| 1085 | MakePair(isolate->heap()->exception(), NULL)); |
| 1086 | return MakePair(*value, *receiver_handle); |
| 1087 | } |
| 1088 | |
| 1089 | if (throw_error) { |
| 1090 | // The property doesn't exist - throw exception. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1091 | Handle<Object> error = isolate->factory()->NewReferenceError( |
| 1092 | MessageTemplate::kNotDefined, name); |
| 1093 | isolate->Throw(*error); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1094 | return MakePair(isolate->heap()->exception(), NULL); |
| 1095 | } else { |
| 1096 | // The property doesn't exist - return undefined. |
| 1097 | return MakePair(isolate->heap()->undefined_value(), |
| 1098 | isolate->heap()->undefined_value()); |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | |
| 1103 | RUNTIME_FUNCTION_RETURN_PAIR(Runtime_LoadLookupSlot) { |
| 1104 | return LoadLookupSlotHelper(args, isolate, true); |
| 1105 | } |
| 1106 | |
| 1107 | |
| 1108 | RUNTIME_FUNCTION_RETURN_PAIR(Runtime_LoadLookupSlotNoReferenceError) { |
| 1109 | return LoadLookupSlotHelper(args, isolate, false); |
| 1110 | } |
| 1111 | |
| 1112 | |
| 1113 | RUNTIME_FUNCTION(Runtime_StoreLookupSlot) { |
| 1114 | HandleScope scope(isolate); |
| 1115 | DCHECK(args.length() == 4); |
| 1116 | |
| 1117 | CONVERT_ARG_HANDLE_CHECKED(Object, value, 0); |
| 1118 | CONVERT_ARG_HANDLE_CHECKED(Context, context, 1); |
| 1119 | CONVERT_ARG_HANDLE_CHECKED(String, name, 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1120 | CONVERT_LANGUAGE_MODE_ARG_CHECKED(language_mode, 3); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1121 | |
| 1122 | int index; |
| 1123 | PropertyAttributes attributes; |
| 1124 | ContextLookupFlags flags = FOLLOW_CHAINS; |
| 1125 | BindingFlags binding_flags; |
| 1126 | Handle<Object> holder = |
| 1127 | context->Lookup(name, flags, &index, &attributes, &binding_flags); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1128 | if (holder.is_null()) { |
| 1129 | // In case of JSProxy, an exception might have been thrown. |
| 1130 | if (isolate->has_pending_exception()) return isolate->heap()->exception(); |
| 1131 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1132 | |
| 1133 | // The property was found in a context slot. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1134 | if (index != Context::kNotFound) { |
| 1135 | if ((binding_flags == MUTABLE_CHECK_INITIALIZED || |
| 1136 | binding_flags == IMMUTABLE_CHECK_INITIALIZED_HARMONY) && |
| 1137 | Handle<Context>::cast(holder)->is_the_hole(index)) { |
| 1138 | THROW_NEW_ERROR_RETURN_FAILURE( |
| 1139 | isolate, NewReferenceError(MessageTemplate::kNotDefined, name)); |
| 1140 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1141 | if ((attributes & READ_ONLY) == 0) { |
| 1142 | Handle<Context>::cast(holder)->set(index, *value); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1143 | } else if (is_strict(language_mode)) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1144 | // Setting read only property in strict mode. |
| 1145 | THROW_NEW_ERROR_RETURN_FAILURE( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1146 | isolate, NewTypeError(MessageTemplate::kStrictCannotAssign, name)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1147 | } |
| 1148 | return *value; |
| 1149 | } |
| 1150 | |
| 1151 | // Slow case: The property is not in a context slot. It is either in a |
| 1152 | // context extension object, a property of the subject of a with, or a |
| 1153 | // property of the global object. |
| 1154 | Handle<JSReceiver> object; |
| 1155 | if (attributes != ABSENT) { |
| 1156 | // The property exists on the holder. |
| 1157 | object = Handle<JSReceiver>::cast(holder); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1158 | } else if (is_strict(language_mode)) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1159 | // If absent in strict mode: throw. |
| 1160 | THROW_NEW_ERROR_RETURN_FAILURE( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1161 | isolate, NewReferenceError(MessageTemplate::kNotDefined, name)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1162 | } else { |
| 1163 | // If absent in sloppy mode: add the property to the global object. |
| 1164 | object = Handle<JSReceiver>(context->global_object()); |
| 1165 | } |
| 1166 | |
| 1167 | RETURN_FAILURE_ON_EXCEPTION( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1168 | isolate, Object::SetProperty(object, name, value, language_mode)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1169 | |
| 1170 | return *value; |
| 1171 | } |
| 1172 | |
| 1173 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1174 | RUNTIME_FUNCTION(Runtime_ArgumentsLength) { |
| 1175 | HandleScope scope(isolate); |
| 1176 | DCHECK(args.length() == 0); |
| 1177 | int argument_count = 0; |
| 1178 | GetCallerArguments(isolate, 0, &argument_count); |
| 1179 | return Smi::FromInt(argument_count); |
| 1180 | } |
| 1181 | |
| 1182 | |
| 1183 | RUNTIME_FUNCTION(Runtime_Arguments) { |
| 1184 | HandleScope scope(isolate); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1185 | DCHECK(args.length() == 1); |
| 1186 | CONVERT_ARG_HANDLE_CHECKED(Object, raw_key, 0); |
| 1187 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1188 | // Determine the actual arguments passed to the function. |
| 1189 | int argument_count_signed = 0; |
| 1190 | base::SmartArrayPointer<Handle<Object>> arguments = |
| 1191 | GetCallerArguments(isolate, 0, &argument_count_signed); |
| 1192 | const uint32_t argument_count = argument_count_signed; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1193 | |
| 1194 | // Try to convert the key to an index. If successful and within |
| 1195 | // index return the the argument from the frame. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1196 | uint32_t index = 0; |
| 1197 | if (raw_key->ToArrayIndex(&index) && index < argument_count) { |
| 1198 | return *arguments[index]; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1199 | } |
| 1200 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1201 | if (raw_key->IsSymbol()) { |
| 1202 | Handle<Symbol> symbol = Handle<Symbol>::cast(raw_key); |
| 1203 | if (Name::Equals(symbol, isolate->factory()->iterator_symbol())) { |
| 1204 | return isolate->native_context()->array_values_iterator(); |
| 1205 | } |
| 1206 | // Lookup in the initial Object.prototype object. |
| 1207 | Handle<Object> result; |
| 1208 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| 1209 | isolate, result, |
| 1210 | Object::GetProperty(isolate->initial_object_prototype(), |
| 1211 | Handle<Symbol>::cast(raw_key))); |
| 1212 | return *result; |
| 1213 | } |
| 1214 | |
| 1215 | // Convert the key to a string. |
| 1216 | Handle<Object> converted; |
| 1217 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, converted, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1218 | Object::ToString(isolate, raw_key)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1219 | Handle<String> key = Handle<String>::cast(converted); |
| 1220 | |
| 1221 | // Try to convert the string key into an array index. |
| 1222 | if (key->AsArrayIndex(&index)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1223 | if (index < argument_count) { |
| 1224 | return *arguments[index]; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1225 | } else { |
| 1226 | Handle<Object> initial_prototype(isolate->initial_object_prototype()); |
| 1227 | Handle<Object> result; |
| 1228 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| 1229 | isolate, result, |
| 1230 | Object::GetElement(isolate, initial_prototype, index)); |
| 1231 | return *result; |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | // Handle special arguments properties. |
| 1236 | if (String::Equals(isolate->factory()->length_string(), key)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1237 | return Smi::FromInt(argument_count); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1238 | } |
| 1239 | if (String::Equals(isolate->factory()->callee_string(), key)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1240 | JavaScriptFrameIterator it(isolate); |
| 1241 | JSFunction* function = it.frame()->function(); |
| 1242 | if (is_strict(function->shared()->language_mode())) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1243 | THROW_NEW_ERROR_RETURN_FAILURE( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1244 | isolate, NewTypeError(MessageTemplate::kStrictPoisonPill)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1245 | } |
| 1246 | return function; |
| 1247 | } |
| 1248 | |
| 1249 | // Lookup in the initial Object.prototype object. |
| 1250 | Handle<Object> result; |
| 1251 | ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| 1252 | isolate, result, |
| 1253 | Object::GetProperty(isolate->initial_object_prototype(), key)); |
| 1254 | return *result; |
| 1255 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1256 | } // namespace internal |
| 1257 | } // namespace v8 |