1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "v8.h" 29 30 #include "accessors.h" 31 #include "api.h" 32 #include "bootstrapper.h" 33 #include "compiler.h" 34 #include "debug.h" 35 #include "execution.h" 36 #include "global-handles.h" 37 #include "macro-assembler.h" 38 #include "natives.h" 39 #include "snapshot.h" 40 41 namespace v8 { 42 namespace internal { 43 44 // A SourceCodeCache uses a FixedArray to store pairs of 45 // (AsciiString*, JSFunction*), mapping names of native code files 46 // (runtime.js, etc.) to precompiled functions. Instead of mapping 47 // names to functions it might make sense to let the JS2C tool 48 // generate an index for each native JS file. 49 class SourceCodeCache BASE_EMBEDDED { 50 public: 51 explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { } 52 53 void Initialize(bool create_heap_objects) { 54 cache_ = create_heap_objects ? Heap::empty_fixed_array() : NULL; 55 } 56 57 void Iterate(ObjectVisitor* v) { 58 v->VisitPointer(bit_cast<Object**, FixedArray**>(&cache_)); 59 } 60 61 62 bool Lookup(Vector<const char> name, Handle<JSFunction>* handle) { 63 for (int i = 0; i < cache_->length(); i+=2) { 64 SeqAsciiString* str = SeqAsciiString::cast(cache_->get(i)); 65 if (str->IsEqualTo(name)) { 66 *handle = Handle<JSFunction>(JSFunction::cast(cache_->get(i + 1))); 67 return true; 68 } 69 } 70 return false; 71 } 72 73 74 void Add(Vector<const char> name, Handle<JSFunction> fun) { 75 ASSERT(fun->IsBoilerplate()); 76 HandleScope scope; 77 int length = cache_->length(); 78 Handle<FixedArray> new_array = 79 Factory::NewFixedArray(length + 2, TENURED); 80 cache_->CopyTo(0, *new_array, 0, cache_->length()); 81 cache_ = *new_array; 82 Handle<String> str = Factory::NewStringFromAscii(name, TENURED); 83 cache_->set(length, *str); 84 cache_->set(length + 1, *fun); 85 Script::cast(fun->shared()->script())->set_type(Smi::FromInt(type_)); 86 } 87 88 private: 89 Script::Type type_; 90 FixedArray* cache_; 91 DISALLOW_COPY_AND_ASSIGN(SourceCodeCache); 92 }; 93 94 static SourceCodeCache extensions_cache(Script::TYPE_EXTENSION); 95 // This is for delete, not delete[]. 96 static List<char*>* delete_these_non_arrays_on_tear_down = NULL; 97 // This is for delete[] 98 static List<char*>* delete_these_arrays_on_tear_down = NULL; 99 100 101 NativesExternalStringResource::NativesExternalStringResource(const char* source) 102 : data_(source), length_(StrLength(source)) { 103 if (delete_these_non_arrays_on_tear_down == NULL) { 104 delete_these_non_arrays_on_tear_down = new List<char*>(2); 105 } 106 // The resources are small objects and we only make a fixed number of 107 // them, but let's clean them up on exit for neatness. 108 delete_these_non_arrays_on_tear_down-> 109 Add(reinterpret_cast<char*>(this)); 110 } 111 112 113 Handle<String> Bootstrapper::NativesSourceLookup(int index) { 114 ASSERT(0 <= index && index < Natives::GetBuiltinsCount()); 115 if (Heap::natives_source_cache()->get(index)->IsUndefined()) { 116 if (!Snapshot::IsEnabled() || FLAG_new_snapshot) { 117 // We can use external strings for the natives. 118 NativesExternalStringResource* resource = 119 new NativesExternalStringResource( 120 Natives::GetScriptSource(index).start()); 121 Handle<String> source_code = 122 Factory::NewExternalStringFromAscii(resource); 123 Heap::natives_source_cache()->set(index, *source_code); 124 } else { 125 // Old snapshot code can't cope with external strings at all. 126 Handle<String> source_code = 127 Factory::NewStringFromAscii(Natives::GetScriptSource(index)); 128 Heap::natives_source_cache()->set(index, *source_code); 129 } 130 } 131 Handle<Object> cached_source(Heap::natives_source_cache()->get(index)); 132 return Handle<String>::cast(cached_source); 133 } 134 135 136 void Bootstrapper::Initialize(bool create_heap_objects) { 137 extensions_cache.Initialize(create_heap_objects); 138 } 139 140 141 char* Bootstrapper::AllocateAutoDeletedArray(int bytes) { 142 char* memory = new char[bytes]; 143 if (memory != NULL) { 144 if (delete_these_arrays_on_tear_down == NULL) { 145 delete_these_arrays_on_tear_down = new List<char*>(2); 146 } 147 delete_these_arrays_on_tear_down->Add(memory); 148 } 149 return memory; 150 } 151 152 153 void Bootstrapper::TearDown() { 154 if (delete_these_non_arrays_on_tear_down != NULL) { 155 int len = delete_these_non_arrays_on_tear_down->length(); 156 ASSERT(len < 20); // Don't use this mechanism for unbounded allocations. 157 for (int i = 0; i < len; i++) { 158 delete delete_these_non_arrays_on_tear_down->at(i); 159 delete_these_non_arrays_on_tear_down->at(i) = NULL; 160 } 161 delete delete_these_non_arrays_on_tear_down; 162 delete_these_non_arrays_on_tear_down = NULL; 163 } 164 165 if (delete_these_arrays_on_tear_down != NULL) { 166 int len = delete_these_arrays_on_tear_down->length(); 167 ASSERT(len < 1000); // Don't use this mechanism for unbounded allocations. 168 for (int i = 0; i < len; i++) { 169 delete[] delete_these_arrays_on_tear_down->at(i); 170 delete_these_arrays_on_tear_down->at(i) = NULL; 171 } 172 delete delete_these_arrays_on_tear_down; 173 delete_these_arrays_on_tear_down = NULL; 174 } 175 176 extensions_cache.Initialize(false); // Yes, symmetrical 177 } 178 179 180 class Genesis BASE_EMBEDDED { 181 public: 182 Genesis(Handle<Object> global_object, 183 v8::Handle<v8::ObjectTemplate> global_template, 184 v8::ExtensionConfiguration* extensions); 185 ~Genesis() { } 186 187 Handle<Context> result() { return result_; } 188 189 Genesis* previous() { return previous_; } 190 191 private: 192 Handle<Context> global_context_; 193 194 // There may be more than one active genesis object: When GC is 195 // triggered during environment creation there may be weak handle 196 // processing callbacks which may create new environments. 197 Genesis* previous_; 198 199 Handle<Context> global_context() { return global_context_; } 200 201 // Creates some basic objects. Used for creating a context from scratch. 202 void CreateRoots(); 203 // Creates the empty function. Used for creating a context from scratch. 204 Handle<JSFunction> CreateEmptyFunction(); 205 // Creates the global objects using the global and the template passed in 206 // through the API. We call this regardless of whether we are building a 207 // context from scratch or using a deserialized one from the partial snapshot 208 // but in the latter case we don't use the objects it produces directly, as 209 // we have to used the deserialized ones that are linked together with the 210 // rest of the context snapshot. 211 Handle<JSGlobalProxy> CreateNewGlobals( 212 v8::Handle<v8::ObjectTemplate> global_template, 213 Handle<Object> global_object, 214 Handle<GlobalObject>* global_proxy_out); 215 // Hooks the given global proxy into the context. If the context was created 216 // by deserialization then this will unhook the global proxy that was 217 // deserialized, leaving the GC to pick it up. 218 void HookUpGlobalProxy(Handle<GlobalObject> inner_global, 219 Handle<JSGlobalProxy> global_proxy); 220 // Similarly, we want to use the inner global that has been created by the 221 // templates passed through the API. The inner global from the snapshot is 222 // detached from the other objects in the snapshot. 223 void HookUpInnerGlobal(Handle<GlobalObject> inner_global); 224 // New context initialization. Used for creating a context from scratch. 225 void InitializeGlobal(Handle<GlobalObject> inner_global, 226 Handle<JSFunction> empty_function); 227 // Installs the contents of the native .js files on the global objects. 228 // Used for creating a context from scratch. 229 void InstallNativeFunctions(); 230 bool InstallNatives(); 231 // Used both for deserialized and from-scratch contexts to add the extensions 232 // provided. 233 static bool InstallExtensions(Handle<Context> global_context, 234 v8::ExtensionConfiguration* extensions); 235 static bool InstallExtension(const char* name); 236 static bool InstallExtension(v8::RegisteredExtension* current); 237 static void InstallSpecialObjects(Handle<Context> global_context); 238 bool InstallJSBuiltins(Handle<JSBuiltinsObject> builtins); 239 bool ConfigureApiObject(Handle<JSObject> object, 240 Handle<ObjectTemplateInfo> object_template); 241 bool ConfigureGlobalObjects(v8::Handle<v8::ObjectTemplate> global_template); 242 243 // Migrates all properties from the 'from' object to the 'to' 244 // object and overrides the prototype in 'to' with the one from 245 // 'from'. 246 void TransferObject(Handle<JSObject> from, Handle<JSObject> to); 247 void TransferNamedProperties(Handle<JSObject> from, Handle<JSObject> to); 248 void TransferIndexedProperties(Handle<JSObject> from, Handle<JSObject> to); 249 250 Handle<DescriptorArray> ComputeFunctionInstanceDescriptor( 251 bool make_prototype_read_only, 252 bool make_prototype_enumerable = false); 253 void MakeFunctionInstancePrototypeWritable(); 254 255 void AddSpecialFunction(Handle<JSObject> prototype, 256 const char* name, 257 Handle<Code> code); 258 259 void BuildSpecialFunctionTable(); 260 261 static bool CompileBuiltin(int index); 262 static bool CompileNative(Vector<const char> name, Handle<String> source); 263 static bool CompileScriptCached(Vector<const char> name, 264 Handle<String> source, 265 SourceCodeCache* cache, 266 v8::Extension* extension, 267 Handle<Context> top_context, 268 bool use_runtime_context); 269 270 Handle<Context> result_; 271 Handle<JSFunction> empty_function_; 272 BootstrapperActive active_; 273 friend class Bootstrapper; 274 }; 275 276 277 void Bootstrapper::Iterate(ObjectVisitor* v) { 278 extensions_cache.Iterate(v); 279 v->Synchronize("Extensions"); 280 } 281 282 283 Handle<Context> Bootstrapper::CreateEnvironment( 284 Handle<Object> global_object, 285 v8::Handle<v8::ObjectTemplate> global_template, 286 v8::ExtensionConfiguration* extensions) { 287 HandleScope scope; 288 Handle<Context> env; 289 Genesis genesis(global_object, global_template, extensions); 290 env = genesis.result(); 291 if (!env.is_null()) { 292 if (InstallExtensions(env, extensions)) { 293 return env; 294 } 295 } 296 return Handle<Context>(); 297 } 298 299 300 static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) { 301 // object.__proto__ = proto; 302 Handle<Map> old_to_map = Handle<Map>(object->map()); 303 Handle<Map> new_to_map = Factory::CopyMapDropTransitions(old_to_map); 304 new_to_map->set_prototype(*proto); 305 object->set_map(*new_to_map); 306 } 307 308 309 void Bootstrapper::DetachGlobal(Handle<Context> env) { 310 JSGlobalProxy::cast(env->global_proxy())->set_context(*Factory::null_value()); 311 SetObjectPrototype(Handle<JSObject>(env->global_proxy()), 312 Factory::null_value()); 313 env->set_global_proxy(env->global()); 314 env->global()->set_global_receiver(env->global()); 315 } 316 317 318 void Bootstrapper::ReattachGlobal(Handle<Context> env, 319 Handle<Object> global_object) { 320 ASSERT(global_object->IsJSGlobalProxy()); 321 Handle<JSGlobalProxy> global = Handle<JSGlobalProxy>::cast(global_object); 322 env->global()->set_global_receiver(*global); 323 env->set_global_proxy(*global); 324 SetObjectPrototype(global, Handle<JSObject>(env->global())); 325 global->set_context(*env); 326 } 327 328 329 static Handle<JSFunction> InstallFunction(Handle<JSObject> target, 330 const char* name, 331 InstanceType type, 332 int instance_size, 333 Handle<JSObject> prototype, 334 Builtins::Name call, 335 bool is_ecma_native) { 336 Handle<String> symbol = Factory::LookupAsciiSymbol(name); 337 Handle<Code> call_code = Handle<Code>(Builtins::builtin(call)); 338 Handle<JSFunction> function = 339 Factory::NewFunctionWithPrototype(symbol, 340 type, 341 instance_size, 342 prototype, 343 call_code, 344 is_ecma_native); 345 SetProperty(target, symbol, function, DONT_ENUM); 346 if (is_ecma_native) { 347 function->shared()->set_instance_class_name(*symbol); 348 } 349 return function; 350 } 351 352 353 Handle<DescriptorArray> Genesis::ComputeFunctionInstanceDescriptor( 354 bool make_prototype_read_only, 355 bool make_prototype_enumerable) { 356 Handle<DescriptorArray> result = Factory::empty_descriptor_array(); 357 358 // Add prototype. 359 PropertyAttributes attributes = static_cast<PropertyAttributes>( 360 (make_prototype_enumerable ? 0 : DONT_ENUM) 361 | DONT_DELETE 362 | (make_prototype_read_only ? READ_ONLY : 0)); 363 result = 364 Factory::CopyAppendProxyDescriptor( 365 result, 366 Factory::prototype_symbol(), 367 Factory::NewProxy(&Accessors::FunctionPrototype), 368 attributes); 369 370 attributes = 371 static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY); 372 // Add length. 373 result = 374 Factory::CopyAppendProxyDescriptor( 375 result, 376 Factory::length_symbol(), 377 Factory::NewProxy(&Accessors::FunctionLength), 378 attributes); 379 380 // Add name. 381 result = 382 Factory::CopyAppendProxyDescriptor( 383 result, 384 Factory::name_symbol(), 385 Factory::NewProxy(&Accessors::FunctionName), 386 attributes); 387 388 // Add arguments. 389 result = 390 Factory::CopyAppendProxyDescriptor( 391 result, 392 Factory::arguments_symbol(), 393 Factory::NewProxy(&Accessors::FunctionArguments), 394 attributes); 395 396 // Add caller. 397 result = 398 Factory::CopyAppendProxyDescriptor( 399 result, 400 Factory::caller_symbol(), 401 Factory::NewProxy(&Accessors::FunctionCaller), 402 attributes); 403 404 return result; 405 } 406 407 408 Handle<JSFunction> Genesis::CreateEmptyFunction() { 409 // Allocate the map for function instances. 410 Handle<Map> fm = Factory::NewMap(JS_FUNCTION_TYPE, JSFunction::kSize); 411 global_context()->set_function_instance_map(*fm); 412 // Please note that the prototype property for function instances must be 413 // writable. 414 Handle<DescriptorArray> function_map_descriptors = 415 ComputeFunctionInstanceDescriptor(false, false); 416 fm->set_instance_descriptors(*function_map_descriptors); 417 418 // Allocate the function map first and then patch the prototype later 419 fm = Factory::NewMap(JS_FUNCTION_TYPE, JSFunction::kSize); 420 global_context()->set_function_map(*fm); 421 function_map_descriptors = ComputeFunctionInstanceDescriptor(true); 422 fm->set_instance_descriptors(*function_map_descriptors); 423 424 Handle<String> object_name = Handle<String>(Heap::Object_symbol()); 425 426 { // --- O b j e c t --- 427 Handle<JSFunction> object_fun = 428 Factory::NewFunction(object_name, Factory::null_value()); 429 Handle<Map> object_function_map = 430 Factory::NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); 431 object_fun->set_initial_map(*object_function_map); 432 object_function_map->set_constructor(*object_fun); 433 434 global_context()->set_object_function(*object_fun); 435 436 // Allocate a new prototype for the object function. 437 Handle<JSObject> prototype = Factory::NewJSObject(Top::object_function(), 438 TENURED); 439 440 global_context()->set_initial_object_prototype(*prototype); 441 SetPrototype(object_fun, prototype); 442 object_function_map-> 443 set_instance_descriptors(Heap::empty_descriptor_array()); 444 } 445 446 // Allocate the empty function as the prototype for function ECMAScript 447 // 262 15.3.4. 448 Handle<String> symbol = Factory::LookupAsciiSymbol("Empty"); 449 Handle<JSFunction> empty_function = 450 Factory::NewFunction(symbol, Factory::null_value()); 451 452 // --- E m p t y --- 453 Handle<Code> code = 454 Handle<Code>(Builtins::builtin(Builtins::EmptyFunction)); 455 empty_function->set_code(*code); 456 Handle<String> source = Factory::NewStringFromAscii(CStrVector("() {}")); 457 Handle<Script> script = Factory::NewScript(source); 458 script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); 459 empty_function->shared()->set_script(*script); 460 empty_function->shared()->set_start_position(0); 461 empty_function->shared()->set_end_position(source->length()); 462 empty_function->shared()->DontAdaptArguments(); 463 global_context()->function_map()->set_prototype(*empty_function); 464 global_context()->function_instance_map()->set_prototype(*empty_function); 465 466 // Allocate the function map first and then patch the prototype later 467 Handle<Map> empty_fm = Factory::CopyMapDropDescriptors(fm); 468 empty_fm->set_instance_descriptors(*function_map_descriptors); 469 empty_fm->set_prototype(global_context()->object_function()->prototype()); 470 empty_function->set_map(*empty_fm); 471 return empty_function; 472 } 473 474 475 void Genesis::CreateRoots() { 476 // Allocate the global context FixedArray first and then patch the 477 // closure and extension object later (we need the empty function 478 // and the global object, but in order to create those, we need the 479 // global context). 480 global_context_ = 481 Handle<Context>::cast( 482 GlobalHandles::Create(*Factory::NewGlobalContext())); 483 Top::set_context(*global_context()); 484 485 // Allocate the message listeners object. 486 { 487 v8::NeanderArray listeners; 488 global_context()->set_message_listeners(*listeners.value()); 489 } 490 } 491 492 493 Handle<JSGlobalProxy> Genesis::CreateNewGlobals( 494 v8::Handle<v8::ObjectTemplate> global_template, 495 Handle<Object> global_object, 496 Handle<GlobalObject>* inner_global_out) { 497 // The argument global_template aka data is an ObjectTemplateInfo. 498 // It has a constructor pointer that points at global_constructor which is a 499 // FunctionTemplateInfo. 500 // The global_constructor is used to create or reinitialize the global_proxy. 501 // The global_constructor also has a prototype_template pointer that points at 502 // js_global_template which is an ObjectTemplateInfo. 503 // That in turn has a constructor pointer that points at 504 // js_global_constructor which is a FunctionTemplateInfo. 505 // js_global_constructor is used to make js_global_function 506 // js_global_function is used to make the new inner_global. 507 // 508 // --- G l o b a l --- 509 // Step 1: Create a fresh inner JSGlobalObject. 510 Handle<JSFunction> js_global_function; 511 Handle<ObjectTemplateInfo> js_global_template; 512 if (!global_template.IsEmpty()) { 513 // Get prototype template of the global_template. 514 Handle<ObjectTemplateInfo> data = 515 v8::Utils::OpenHandle(*global_template); 516 Handle<FunctionTemplateInfo> global_constructor = 517 Handle<FunctionTemplateInfo>( 518 FunctionTemplateInfo::cast(data->constructor())); 519 Handle<Object> proto_template(global_constructor->prototype_template()); 520 if (!proto_template->IsUndefined()) { 521 js_global_template = 522 Handle<ObjectTemplateInfo>::cast(proto_template); 523 } 524 } 525 526 if (js_global_template.is_null()) { 527 Handle<String> name = Handle<String>(Heap::empty_symbol()); 528 Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal)); 529 js_global_function = 530 Factory::NewFunction(name, JS_GLOBAL_OBJECT_TYPE, 531 JSGlobalObject::kSize, code, true); 532 // Change the constructor property of the prototype of the 533 // hidden global function to refer to the Object function. 534 Handle<JSObject> prototype = 535 Handle<JSObject>( 536 JSObject::cast(js_global_function->instance_prototype())); 537 SetProperty(prototype, Factory::constructor_symbol(), 538 Top::object_function(), NONE); 539 } else { 540 Handle<FunctionTemplateInfo> js_global_constructor( 541 FunctionTemplateInfo::cast(js_global_template->constructor())); 542 js_global_function = 543 Factory::CreateApiFunction(js_global_constructor, 544 Factory::InnerGlobalObject); 545 } 546 547 js_global_function->initial_map()->set_is_hidden_prototype(); 548 Handle<GlobalObject> inner_global = 549 Factory::NewGlobalObject(js_global_function); 550 if (inner_global_out != NULL) { 551 *inner_global_out = inner_global; 552 } 553 554 // Step 2: create or re-initialize the global proxy object. 555 Handle<JSFunction> global_proxy_function; 556 if (global_template.IsEmpty()) { 557 Handle<String> name = Handle<String>(Heap::empty_symbol()); 558 Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal)); 559 global_proxy_function = 560 Factory::NewFunction(name, JS_GLOBAL_PROXY_TYPE, 561 JSGlobalProxy::kSize, code, true); 562 } else { 563 Handle<ObjectTemplateInfo> data = 564 v8::Utils::OpenHandle(*global_template); 565 Handle<FunctionTemplateInfo> global_constructor( 566 FunctionTemplateInfo::cast(data->constructor())); 567 global_proxy_function = 568 Factory::CreateApiFunction(global_constructor, 569 Factory::OuterGlobalObject); 570 } 571 572 Handle<String> global_name = Factory::LookupAsciiSymbol("global"); 573 global_proxy_function->shared()->set_instance_class_name(*global_name); 574 global_proxy_function->initial_map()->set_is_access_check_needed(true); 575 576 // Set global_proxy.__proto__ to js_global after ConfigureGlobalObjects 577 // Return the global proxy. 578 579 if (global_object.location() != NULL) { 580 ASSERT(global_object->IsJSGlobalProxy()); 581 return ReinitializeJSGlobalProxy( 582 global_proxy_function, 583 Handle<JSGlobalProxy>::cast(global_object)); 584 } else { 585 return Handle<JSGlobalProxy>::cast( 586 Factory::NewJSObject(global_proxy_function, TENURED)); 587 } 588 } 589 590 591 void Genesis::HookUpGlobalProxy(Handle<GlobalObject> inner_global, 592 Handle<JSGlobalProxy> global_proxy) { 593 // Set the global context for the global object. 594 inner_global->set_global_context(*global_context()); 595 inner_global->set_global_receiver(*global_proxy); 596 global_proxy->set_context(*global_context()); 597 global_context()->set_global_proxy(*global_proxy); 598 } 599 600 601 void Genesis::HookUpInnerGlobal(Handle<GlobalObject> inner_global) { 602 Handle<GlobalObject> inner_global_from_snapshot( 603 GlobalObject::cast(global_context_->extension())); 604 Handle<JSBuiltinsObject> builtins_global(global_context_->builtins()); 605 global_context_->set_extension(*inner_global); 606 global_context_->set_global(*inner_global); 607 global_context_->set_security_token(*inner_global); 608 static const PropertyAttributes attributes = 609 static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE); 610 ForceSetProperty(builtins_global, 611 Factory::LookupAsciiSymbol("global"), 612 inner_global, 613 attributes); 614 // Setup the reference from the global object to the builtins object. 615 JSGlobalObject::cast(*inner_global)->set_builtins(*builtins_global); 616 TransferNamedProperties(inner_global_from_snapshot, inner_global); 617 TransferIndexedProperties(inner_global_from_snapshot, inner_global); 618 } 619 620 621 // This is only called if we are not using snapshots. The equivalent 622 // work in the snapshot case is done in HookUpInnerGlobal. 623 void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global, 624 Handle<JSFunction> empty_function) { 625 // --- G l o b a l C o n t e x t --- 626 // Use the empty function as closure (no scope info). 627 global_context()->set_closure(*empty_function); 628 global_context()->set_fcontext(*global_context()); 629 global_context()->set_previous(NULL); 630 // Set extension and global object. 631 global_context()->set_extension(*inner_global); 632 global_context()->set_global(*inner_global); 633 // Security setup: Set the security token of the global object to 634 // its the inner global. This makes the security check between two 635 // different contexts fail by default even in case of global 636 // object reinitialization. 637 global_context()->set_security_token(*inner_global); 638 639 Handle<String> object_name = Handle<String>(Heap::Object_symbol()); 640 SetProperty(inner_global, object_name, Top::object_function(), DONT_ENUM); 641 642 Handle<JSObject> global = Handle<JSObject>(global_context()->global()); 643 644 // Install global Function object 645 InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize, 646 empty_function, Builtins::Illegal, true); // ECMA native. 647 648 { // --- A r r a y --- 649 Handle<JSFunction> array_function = 650 InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize, 651 Top::initial_object_prototype(), Builtins::ArrayCode, 652 true); 653 array_function->shared()->set_construct_stub( 654 Builtins::builtin(Builtins::ArrayConstructCode)); 655 array_function->shared()->DontAdaptArguments(); 656 657 // This seems a bit hackish, but we need to make sure Array.length 658 // is 1. 659 array_function->shared()->set_length(1); 660 Handle<DescriptorArray> array_descriptors = 661 Factory::CopyAppendProxyDescriptor( 662 Factory::empty_descriptor_array(), 663 Factory::length_symbol(), 664 Factory::NewProxy(&Accessors::ArrayLength), 665 static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE)); 666 667 // Cache the fast JavaScript array map 668 global_context()->set_js_array_map(array_function->initial_map()); 669 global_context()->js_array_map()->set_instance_descriptors( 670 *array_descriptors); 671 // array_function is used internally. JS code creating array object should 672 // search for the 'Array' property on the global object and use that one 673 // as the constructor. 'Array' property on a global object can be 674 // overwritten by JS code. 675 global_context()->set_array_function(*array_function); 676 } 677 678 { // --- N u m b e r --- 679 Handle<JSFunction> number_fun = 680 InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize, 681 Top::initial_object_prototype(), Builtins::Illegal, 682 true); 683 global_context()->set_number_function(*number_fun); 684 } 685 686 { // --- B o o l e a n --- 687 Handle<JSFunction> boolean_fun = 688 InstallFunction(global, "Boolean", JS_VALUE_TYPE, JSValue::kSize, 689 Top::initial_object_prototype(), Builtins::Illegal, 690 true); 691 global_context()->set_boolean_function(*boolean_fun); 692 } 693 694 { // --- S t r i n g --- 695 Handle<JSFunction> string_fun = 696 InstallFunction(global, "String", JS_VALUE_TYPE, JSValue::kSize, 697 Top::initial_object_prototype(), Builtins::Illegal, 698 true); 699 global_context()->set_string_function(*string_fun); 700 // Add 'length' property to strings. 701 Handle<DescriptorArray> string_descriptors = 702 Factory::CopyAppendProxyDescriptor( 703 Factory::empty_descriptor_array(), 704 Factory::length_symbol(), 705 Factory::NewProxy(&Accessors::StringLength), 706 static_cast<PropertyAttributes>(DONT_ENUM | 707 DONT_DELETE | 708 READ_ONLY)); 709 710 Handle<Map> string_map = 711 Handle<Map>(global_context()->string_function()->initial_map()); 712 string_map->set_instance_descriptors(*string_descriptors); 713 } 714 715 { // --- D a t e --- 716 // Builtin functions for Date.prototype. 717 Handle<JSFunction> date_fun = 718 InstallFunction(global, "Date", JS_VALUE_TYPE, JSValue::kSize, 719 Top::initial_object_prototype(), Builtins::Illegal, 720 true); 721 722 global_context()->set_date_function(*date_fun); 723 } 724 725 726 { // -- R e g E x p 727 // Builtin functions for RegExp.prototype. 728 Handle<JSFunction> regexp_fun = 729 InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize, 730 Top::initial_object_prototype(), Builtins::Illegal, 731 true); 732 733 global_context()->set_regexp_function(*regexp_fun); 734 } 735 736 { // -- J S O N 737 Handle<String> name = Factory::NewStringFromAscii(CStrVector("JSON")); 738 Handle<JSFunction> cons = Factory::NewFunction( 739 name, 740 Factory::the_hole_value()); 741 cons->SetInstancePrototype(global_context()->initial_object_prototype()); 742 cons->SetInstanceClassName(*name); 743 Handle<JSObject> json_object = Factory::NewJSObject(cons, TENURED); 744 ASSERT(json_object->IsJSObject()); 745 SetProperty(global, name, json_object, DONT_ENUM); 746 global_context()->set_json_object(*json_object); 747 } 748 749 { // --- arguments_boilerplate_ 750 // Make sure we can recognize argument objects at runtime. 751 // This is done by introducing an anonymous function with 752 // class_name equals 'Arguments'. 753 Handle<String> symbol = Factory::LookupAsciiSymbol("Arguments"); 754 Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal)); 755 Handle<JSObject> prototype = 756 Handle<JSObject>( 757 JSObject::cast(global_context()->object_function()->prototype())); 758 759 Handle<JSFunction> function = 760 Factory::NewFunctionWithPrototype(symbol, 761 JS_OBJECT_TYPE, 762 JSObject::kHeaderSize, 763 prototype, 764 code, 765 false); 766 ASSERT(!function->has_initial_map()); 767 function->shared()->set_instance_class_name(*symbol); 768 function->shared()->set_expected_nof_properties(2); 769 Handle<JSObject> result = Factory::NewJSObject(function); 770 771 global_context()->set_arguments_boilerplate(*result); 772 // Note: callee must be added as the first property and 773 // length must be added as the second property. 774 SetProperty(result, Factory::callee_symbol(), 775 Factory::undefined_value(), 776 DONT_ENUM); 777 SetProperty(result, Factory::length_symbol(), 778 Factory::undefined_value(), 779 DONT_ENUM); 780 781 #ifdef DEBUG 782 LookupResult lookup; 783 result->LocalLookup(Heap::callee_symbol(), &lookup); 784 ASSERT(lookup.IsProperty() && (lookup.type() == FIELD)); 785 ASSERT(lookup.GetFieldIndex() == Heap::arguments_callee_index); 786 787 result->LocalLookup(Heap::length_symbol(), &lookup); 788 ASSERT(lookup.IsProperty() && (lookup.type() == FIELD)); 789 ASSERT(lookup.GetFieldIndex() == Heap::arguments_length_index); 790 791 ASSERT(result->map()->inobject_properties() > Heap::arguments_callee_index); 792 ASSERT(result->map()->inobject_properties() > Heap::arguments_length_index); 793 794 // Check the state of the object. 795 ASSERT(result->HasFastProperties()); 796 ASSERT(result->HasFastElements()); 797 #endif 798 } 799 800 { // --- context extension 801 // Create a function for the context extension objects. 802 Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal)); 803 Handle<JSFunction> context_extension_fun = 804 Factory::NewFunction(Factory::empty_symbol(), 805 JS_CONTEXT_EXTENSION_OBJECT_TYPE, 806 JSObject::kHeaderSize, 807 code, 808 true); 809 810 Handle<String> name = Factory::LookupAsciiSymbol("context_extension"); 811 context_extension_fun->shared()->set_instance_class_name(*name); 812 global_context()->set_context_extension_function(*context_extension_fun); 813 } 814 815 816 { 817 // Setup the call-as-function delegate. 818 Handle<Code> code = 819 Handle<Code>(Builtins::builtin(Builtins::HandleApiCallAsFunction)); 820 Handle<JSFunction> delegate = 821 Factory::NewFunction(Factory::empty_symbol(), JS_OBJECT_TYPE, 822 JSObject::kHeaderSize, code, true); 823 global_context()->set_call_as_function_delegate(*delegate); 824 delegate->shared()->DontAdaptArguments(); 825 } 826 827 { 828 // Setup the call-as-constructor delegate. 829 Handle<Code> code = 830 Handle<Code>(Builtins::builtin(Builtins::HandleApiCallAsConstructor)); 831 Handle<JSFunction> delegate = 832 Factory::NewFunction(Factory::empty_symbol(), JS_OBJECT_TYPE, 833 JSObject::kHeaderSize, code, true); 834 global_context()->set_call_as_constructor_delegate(*delegate); 835 delegate->shared()->DontAdaptArguments(); 836 } 837 838 global_context()->set_special_function_table(Heap::empty_fixed_array()); 839 840 // Initialize the out of memory slot. 841 global_context()->set_out_of_memory(Heap::false_value()); 842 843 // Initialize the data slot. 844 global_context()->set_data(Heap::undefined_value()); 845 } 846 847 848 bool Genesis::CompileBuiltin(int index) { 849 Vector<const char> name = Natives::GetScriptName(index); 850 Handle<String> source_code = Bootstrapper::NativesSourceLookup(index); 851 return CompileNative(name, source_code); 852 } 853 854 855 bool Genesis::CompileNative(Vector<const char> name, Handle<String> source) { 856 HandleScope scope; 857 #ifdef ENABLE_DEBUGGER_SUPPORT 858 Debugger::set_compiling_natives(true); 859 #endif 860 bool result = CompileScriptCached(name, 861 source, 862 NULL, 863 NULL, 864 Handle<Context>(Top::context()), 865 true); 866 ASSERT(Top::has_pending_exception() != result); 867 if (!result) Top::clear_pending_exception(); 868 #ifdef ENABLE_DEBUGGER_SUPPORT 869 Debugger::set_compiling_natives(false); 870 #endif 871 return result; 872 } 873 874 875 bool Genesis::CompileScriptCached(Vector<const char> name, 876 Handle<String> source, 877 SourceCodeCache* cache, 878 v8::Extension* extension, 879 Handle<Context> top_context, 880 bool use_runtime_context) { 881 HandleScope scope; 882 Handle<JSFunction> boilerplate; 883 884 // If we can't find the function in the cache, we compile a new 885 // function and insert it into the cache. 886 if (cache == NULL || !cache->Lookup(name, &boilerplate)) { 887 ASSERT(source->IsAsciiRepresentation()); 888 Handle<String> script_name = Factory::NewStringFromUtf8(name); 889 boilerplate = Compiler::Compile( 890 source, 891 script_name, 892 0, 893 0, 894 extension, 895 NULL, 896 Handle<String>::null(), 897 use_runtime_context ? NATIVES_CODE : NOT_NATIVES_CODE); 898 if (boilerplate.is_null()) return false; 899 if (cache != NULL) cache->Add(name, boilerplate); 900 } 901 902 // Setup the function context. Conceptually, we should clone the 903 // function before overwriting the context but since we're in a 904 // single-threaded environment it is not strictly necessary. 905 ASSERT(top_context->IsGlobalContext()); 906 Handle<Context> context = 907 Handle<Context>(use_runtime_context 908 ? Handle<Context>(top_context->runtime_context()) 909 : top_context); 910 Handle<JSFunction> fun = 911 Factory::NewFunctionFromBoilerplate(boilerplate, context); 912 913 // Call function using either the runtime object or the global 914 // object as the receiver. Provide no parameters. 915 Handle<Object> receiver = 916 Handle<Object>(use_runtime_context 917 ? top_context->builtins() 918 : top_context->global()); 919 bool has_pending_exception; 920 Handle<Object> result = 921 Execution::Call(fun, receiver, 0, NULL, &has_pending_exception); 922 if (has_pending_exception) return false; 923 return true; 924 } 925 926 927 #define INSTALL_NATIVE(Type, name, var) \ 928 Handle<String> var##_name = Factory::LookupAsciiSymbol(name); \ 929 global_context()->set_##var(Type::cast(global_context()-> \ 930 builtins()-> \ 931 GetProperty(*var##_name))); 932 933 void Genesis::InstallNativeFunctions() { 934 HandleScope scope; 935 INSTALL_NATIVE(JSFunction, "CreateDate", create_date_fun); 936 INSTALL_NATIVE(JSFunction, "ToNumber", to_number_fun); 937 INSTALL_NATIVE(JSFunction, "ToString", to_string_fun); 938 INSTALL_NATIVE(JSFunction, "ToDetailString", to_detail_string_fun); 939 INSTALL_NATIVE(JSFunction, "ToObject", to_object_fun); 940 INSTALL_NATIVE(JSFunction, "ToInteger", to_integer_fun); 941 INSTALL_NATIVE(JSFunction, "ToUint32", to_uint32_fun); 942 INSTALL_NATIVE(JSFunction, "ToInt32", to_int32_fun); 943 INSTALL_NATIVE(JSFunction, "GlobalEval", global_eval_fun); 944 INSTALL_NATIVE(JSFunction, "Instantiate", instantiate_fun); 945 INSTALL_NATIVE(JSFunction, "ConfigureTemplateInstance", 946 configure_instance_fun); 947 INSTALL_NATIVE(JSFunction, "MakeMessage", make_message_fun); 948 INSTALL_NATIVE(JSFunction, "GetStackTraceLine", get_stack_trace_line_fun); 949 INSTALL_NATIVE(JSObject, "functionCache", function_cache); 950 } 951 952 #undef INSTALL_NATIVE 953 954 955 bool Genesis::InstallNatives() { 956 HandleScope scope; 957 958 // Create a function for the builtins object. Allocate space for the 959 // JavaScript builtins, a reference to the builtins object 960 // (itself) and a reference to the global_context directly in the object. 961 Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal)); 962 Handle<JSFunction> builtins_fun = 963 Factory::NewFunction(Factory::empty_symbol(), JS_BUILTINS_OBJECT_TYPE, 964 JSBuiltinsObject::kSize, code, true); 965 966 Handle<String> name = Factory::LookupAsciiSymbol("builtins"); 967 builtins_fun->shared()->set_instance_class_name(*name); 968 969 // Allocate the builtins object. 970 Handle<JSBuiltinsObject> builtins = 971 Handle<JSBuiltinsObject>::cast(Factory::NewGlobalObject(builtins_fun)); 972 builtins->set_builtins(*builtins); 973 builtins->set_global_context(*global_context()); 974 builtins->set_global_receiver(*builtins); 975 976 // Setup the 'global' properties of the builtins object. The 977 // 'global' property that refers to the global object is the only 978 // way to get from code running in the builtins context to the 979 // global object. 980 static const PropertyAttributes attributes = 981 static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE); 982 SetProperty(builtins, Factory::LookupAsciiSymbol("global"), 983 Handle<Object>(global_context()->global()), attributes); 984 985 // Setup the reference from the global object to the builtins object. 986 JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins); 987 988 // Create a bridge function that has context in the global context. 989 Handle<JSFunction> bridge = 990 Factory::NewFunction(Factory::empty_symbol(), Factory::undefined_value()); 991 ASSERT(bridge->context() == *Top::global_context()); 992 993 // Allocate the builtins context. 994 Handle<Context> context = 995 Factory::NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge); 996 context->set_global(*builtins); // override builtins global object 997 998 global_context()->set_runtime_context(*context); 999 1000 { // -- S c r i p t 1001 // Builtin functions for Script. 1002 Handle<JSFunction> script_fun = 1003 InstallFunction(builtins, "Script", JS_VALUE_TYPE, JSValue::kSize, 1004 Top::initial_object_prototype(), Builtins::Illegal, 1005 false); 1006 Handle<JSObject> prototype = 1007 Factory::NewJSObject(Top::object_function(), TENURED); 1008 SetPrototype(script_fun, prototype); 1009 global_context()->set_script_function(*script_fun); 1010 1011 // Add 'source' and 'data' property to scripts. 1012 PropertyAttributes common_attributes = 1013 static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY); 1014 Handle<Proxy> proxy_source = Factory::NewProxy(&Accessors::ScriptSource); 1015 Handle<DescriptorArray> script_descriptors = 1016 Factory::CopyAppendProxyDescriptor( 1017 Factory::empty_descriptor_array(), 1018 Factory::LookupAsciiSymbol("source"), 1019 proxy_source, 1020 common_attributes); 1021 Handle<Proxy> proxy_name = Factory::NewProxy(&Accessors::ScriptName); 1022 script_descriptors = 1023 Factory::CopyAppendProxyDescriptor( 1024 script_descriptors, 1025 Factory::LookupAsciiSymbol("name"), 1026 proxy_name, 1027 common_attributes); 1028 Handle<Proxy> proxy_id = Factory::NewProxy(&Accessors::ScriptId); 1029 script_descriptors = 1030 Factory::CopyAppendProxyDescriptor( 1031 script_descriptors, 1032 Factory::LookupAsciiSymbol("id"), 1033 proxy_id, 1034 common_attributes); 1035 Handle<Proxy> proxy_line_offset = 1036 Factory::NewProxy(&Accessors::ScriptLineOffset); 1037 script_descriptors = 1038 Factory::CopyAppendProxyDescriptor( 1039 script_descriptors, 1040 Factory::LookupAsciiSymbol("line_offset"), 1041 proxy_line_offset, 1042 common_attributes); 1043 Handle<Proxy> proxy_column_offset = 1044 Factory::NewProxy(&Accessors::ScriptColumnOffset); 1045 script_descriptors = 1046 Factory::CopyAppendProxyDescriptor( 1047 script_descriptors, 1048 Factory::LookupAsciiSymbol("column_offset"), 1049 proxy_column_offset, 1050 common_attributes); 1051 Handle<Proxy> proxy_data = Factory::NewProxy(&Accessors::ScriptData); 1052 script_descriptors = 1053 Factory::CopyAppendProxyDescriptor( 1054 script_descriptors, 1055 Factory::LookupAsciiSymbol("data"), 1056 proxy_data, 1057 common_attributes); 1058 Handle<Proxy> proxy_type = Factory::NewProxy(&Accessors::ScriptType); 1059 script_descriptors = 1060 Factory::CopyAppendProxyDescriptor( 1061 script_descriptors, 1062 Factory::LookupAsciiSymbol("type"), 1063 proxy_type, 1064 common_attributes); 1065 Handle<Proxy> proxy_compilation_type = 1066 Factory::NewProxy(&Accessors::ScriptCompilationType); 1067 script_descriptors = 1068 Factory::CopyAppendProxyDescriptor( 1069 script_descriptors, 1070 Factory::LookupAsciiSymbol("compilation_type"), 1071 proxy_compilation_type, 1072 common_attributes); 1073 Handle<Proxy> proxy_line_ends = 1074 Factory::NewProxy(&Accessors::ScriptLineEnds); 1075 script_descriptors = 1076 Factory::CopyAppendProxyDescriptor( 1077 script_descriptors, 1078 Factory::LookupAsciiSymbol("line_ends"), 1079 proxy_line_ends, 1080 common_attributes); 1081 Handle<Proxy> proxy_context_data = 1082 Factory::NewProxy(&Accessors::ScriptContextData); 1083 script_descriptors = 1084 Factory::CopyAppendProxyDescriptor( 1085 script_descriptors, 1086 Factory::LookupAsciiSymbol("context_data"), 1087 proxy_context_data, 1088 common_attributes); 1089 Handle<Proxy> proxy_eval_from_script = 1090 Factory::NewProxy(&Accessors::ScriptEvalFromScript); 1091 script_descriptors = 1092 Factory::CopyAppendProxyDescriptor( 1093 script_descriptors, 1094 Factory::LookupAsciiSymbol("eval_from_script"), 1095 proxy_eval_from_script, 1096 common_attributes); 1097 Handle<Proxy> proxy_eval_from_script_position = 1098 Factory::NewProxy(&Accessors::ScriptEvalFromScriptPosition); 1099 script_descriptors = 1100 Factory::CopyAppendProxyDescriptor( 1101 script_descriptors, 1102 Factory::LookupAsciiSymbol("eval_from_script_position"), 1103 proxy_eval_from_script_position, 1104 common_attributes); 1105 Handle<Proxy> proxy_eval_from_function_name = 1106 Factory::NewProxy(&Accessors::ScriptEvalFromFunctionName); 1107 script_descriptors = 1108 Factory::CopyAppendProxyDescriptor( 1109 script_descriptors, 1110 Factory::LookupAsciiSymbol("eval_from_function_name"), 1111 proxy_eval_from_function_name, 1112 common_attributes); 1113 1114 Handle<Map> script_map = Handle<Map>(script_fun->initial_map()); 1115 script_map->set_instance_descriptors(*script_descriptors); 1116 1117 // Allocate the empty script. 1118 Handle<Script> script = Factory::NewScript(Factory::empty_string()); 1119 script->set_type(Smi::FromInt(Script::TYPE_NATIVE)); 1120 Heap::public_set_empty_script(*script); 1121 } 1122 1123 // Install natives. 1124 for (int i = Natives::GetDebuggerCount(); 1125 i < Natives::GetBuiltinsCount(); 1126 i++) { 1127 Vector<const char> name = Natives::GetScriptName(i); 1128 if (!CompileBuiltin(i)) return false; 1129 // TODO(ager): We really only need to install the JS builtin 1130 // functions on the builtins object after compiling and running 1131 // runtime.js. 1132 if (!InstallJSBuiltins(builtins)) return false; 1133 } 1134 1135 InstallNativeFunctions(); 1136 1137 // Install Function.prototype.call and apply. 1138 { Handle<String> key = Factory::function_class_symbol(); 1139 Handle<JSFunction> function = 1140 Handle<JSFunction>::cast(GetProperty(Top::global(), key)); 1141 Handle<JSObject> proto = 1142 Handle<JSObject>(JSObject::cast(function->instance_prototype())); 1143 1144 // Install the call and the apply functions. 1145 Handle<JSFunction> call = 1146 InstallFunction(proto, "call", JS_OBJECT_TYPE, JSObject::kHeaderSize, 1147 Factory::NewJSObject(Top::object_function(), TENURED), 1148 Builtins::FunctionCall, 1149 false); 1150 Handle<JSFunction> apply = 1151 InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize, 1152 Factory::NewJSObject(Top::object_function(), TENURED), 1153 Builtins::FunctionApply, 1154 false); 1155 1156 // Make sure that Function.prototype.call appears to be compiled. 1157 // The code will never be called, but inline caching for call will 1158 // only work if it appears to be compiled. 1159 call->shared()->DontAdaptArguments(); 1160 ASSERT(call->is_compiled()); 1161 1162 // Set the expected parameters for apply to 2; required by builtin. 1163 apply->shared()->set_formal_parameter_count(2); 1164 1165 // Set the lengths for the functions to satisfy ECMA-262. 1166 call->shared()->set_length(1); 1167 apply->shared()->set_length(2); 1168 } 1169 1170 #ifdef DEBUG 1171 builtins->Verify(); 1172 #endif 1173 1174 return true; 1175 } 1176 1177 1178 int BootstrapperActive::nesting_ = 0; 1179 1180 1181 bool Bootstrapper::InstallExtensions(Handle<Context> global_context, 1182 v8::ExtensionConfiguration* extensions) { 1183 BootstrapperActive active; 1184 SaveContext saved_context; 1185 Top::set_context(*global_context); 1186 if (!Genesis::InstallExtensions(global_context, extensions)) return false; 1187 Genesis::InstallSpecialObjects(global_context); 1188 return true; 1189 } 1190 1191 1192 void Genesis::InstallSpecialObjects(Handle<Context> global_context) { 1193 HandleScope scope; 1194 Handle<JSGlobalObject> js_global( 1195 JSGlobalObject::cast(global_context->global())); 1196 // Expose the natives in global if a name for it is specified. 1197 if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) { 1198 Handle<String> natives_string = 1199 Factory::LookupAsciiSymbol(FLAG_expose_natives_as); 1200 SetProperty(js_global, natives_string, 1201 Handle<JSObject>(js_global->builtins()), DONT_ENUM); 1202 } 1203 1204 Handle<Object> Error = GetProperty(js_global, "Error"); 1205 if (Error->IsJSObject()) { 1206 Handle<String> name = Factory::LookupAsciiSymbol("stackTraceLimit"); 1207 SetProperty(Handle<JSObject>::cast(Error), 1208 name, 1209 Handle<Smi>(Smi::FromInt(FLAG_stack_trace_limit)), 1210 NONE); 1211 } 1212 1213 #ifdef ENABLE_DEBUGGER_SUPPORT 1214 // Expose the debug global object in global if a name for it is specified. 1215 if (FLAG_expose_debug_as != NULL && strlen(FLAG_expose_debug_as) != 0) { 1216 // If loading fails we just bail out without installing the 1217 // debugger but without tanking the whole context. 1218 if (!Debug::Load()) return; 1219 // Set the security token for the debugger context to the same as 1220 // the shell global context to allow calling between these (otherwise 1221 // exposing debug global object doesn't make much sense). 1222 Debug::debug_context()->set_security_token( 1223 global_context->security_token()); 1224 1225 Handle<String> debug_string = 1226 Factory::LookupAsciiSymbol(FLAG_expose_debug_as); 1227 SetProperty(js_global, debug_string, 1228 Handle<Object>(Debug::debug_context()->global_proxy()), DONT_ENUM); 1229 } 1230 #endif 1231 } 1232 1233 1234 bool Genesis::InstallExtensions(Handle<Context> global_context, 1235 v8::ExtensionConfiguration* extensions) { 1236 // Clear coloring of extension list 1237 v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension(); 1238 while (current != NULL) { 1239 current->set_state(v8::UNVISITED); 1240 current = current->next(); 1241 } 1242 // Install auto extensions. 1243 current = v8::RegisteredExtension::first_extension(); 1244 while (current != NULL) { 1245 if (current->extension()->auto_enable()) 1246 InstallExtension(current); 1247 current = current->next(); 1248 } 1249 1250 if (FLAG_expose_gc) InstallExtension("v8/gc"); 1251 1252 if (extensions == NULL) return true; 1253 // Install required extensions 1254 int count = v8::ImplementationUtilities::GetNameCount(extensions); 1255 const char** names = v8::ImplementationUtilities::GetNames(extensions); 1256 for (int i = 0; i < count; i++) { 1257 if (!InstallExtension(names[i])) 1258 return false; 1259 } 1260 1261 return true; 1262 } 1263 1264 1265 // Installs a named extension. This methods is unoptimized and does 1266 // not scale well if we want to support a large number of extensions. 1267 bool Genesis::InstallExtension(const char* name) { 1268 v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension(); 1269 // Loop until we find the relevant extension 1270 while (current != NULL) { 1271 if (strcmp(name, current->extension()->name()) == 0) break; 1272 current = current->next(); 1273 } 1274 // Didn't find the extension; fail. 1275 if (current == NULL) { 1276 v8::Utils::ReportApiFailure( 1277 "v8::Context::New()", "Cannot find required extension"); 1278 return false; 1279 } 1280 return InstallExtension(current); 1281 } 1282 1283 1284 bool Genesis::InstallExtension(v8::RegisteredExtension* current) { 1285 HandleScope scope; 1286 1287 if (current->state() == v8::INSTALLED) return true; 1288 // The current node has already been visited so there must be a 1289 // cycle in the dependency graph; fail. 1290 if (current->state() == v8::VISITED) { 1291 v8::Utils::ReportApiFailure( 1292 "v8::Context::New()", "Circular extension dependency"); 1293 return false; 1294 } 1295 ASSERT(current->state() == v8::UNVISITED); 1296 current->set_state(v8::VISITED); 1297 v8::Extension* extension = current->extension(); 1298 // Install the extension's dependencies 1299 for (int i = 0; i < extension->dependency_count(); i++) { 1300 if (!InstallExtension(extension->dependencies()[i])) return false; 1301 } 1302 Vector<const char> source = CStrVector(extension->source()); 1303 Handle<String> source_code = Factory::NewStringFromAscii(source); 1304 bool result = CompileScriptCached(CStrVector(extension->name()), 1305 source_code, 1306 &extensions_cache, 1307 extension, 1308 Handle<Context>(Top::context()), 1309 false); 1310 ASSERT(Top::has_pending_exception() != result); 1311 if (!result) { 1312 Top::clear_pending_exception(); 1313 } 1314 current->set_state(v8::INSTALLED); 1315 return result; 1316 } 1317 1318 1319 bool Genesis::InstallJSBuiltins(Handle<JSBuiltinsObject> builtins) { 1320 HandleScope scope; 1321 for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) { 1322 Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i); 1323 Handle<String> name = Factory::LookupAsciiSymbol(Builtins::GetName(id)); 1324 Handle<JSFunction> function 1325 = Handle<JSFunction>(JSFunction::cast(builtins->GetProperty(*name))); 1326 builtins->set_javascript_builtin(id, *function); 1327 Handle<SharedFunctionInfo> shared 1328 = Handle<SharedFunctionInfo>(function->shared()); 1329 if (!EnsureCompiled(shared, CLEAR_EXCEPTION)) return false; 1330 } 1331 return true; 1332 } 1333 1334 1335 bool Genesis::ConfigureGlobalObjects( 1336 v8::Handle<v8::ObjectTemplate> global_proxy_template) { 1337 Handle<JSObject> global_proxy( 1338 JSObject::cast(global_context()->global_proxy())); 1339 Handle<JSObject> inner_global(JSObject::cast(global_context()->global())); 1340 1341 if (!global_proxy_template.IsEmpty()) { 1342 // Configure the global proxy object. 1343 Handle<ObjectTemplateInfo> proxy_data = 1344 v8::Utils::OpenHandle(*global_proxy_template); 1345 if (!ConfigureApiObject(global_proxy, proxy_data)) return false; 1346 1347 // Configure the inner global object. 1348 Handle<FunctionTemplateInfo> proxy_constructor( 1349 FunctionTemplateInfo::cast(proxy_data->constructor())); 1350 if (!proxy_constructor->prototype_template()->IsUndefined()) { 1351 Handle<ObjectTemplateInfo> inner_data( 1352 ObjectTemplateInfo::cast(proxy_constructor->prototype_template())); 1353 if (!ConfigureApiObject(inner_global, inner_data)) return false; 1354 } 1355 } 1356 1357 SetObjectPrototype(global_proxy, inner_global); 1358 return true; 1359 } 1360 1361 1362 bool Genesis::ConfigureApiObject(Handle<JSObject> object, 1363 Handle<ObjectTemplateInfo> object_template) { 1364 ASSERT(!object_template.is_null()); 1365 ASSERT(object->IsInstanceOf( 1366 FunctionTemplateInfo::cast(object_template->constructor()))); 1367 1368 bool pending_exception = false; 1369 Handle<JSObject> obj = 1370 Execution::InstantiateObject(object_template, &pending_exception); 1371 if (pending_exception) { 1372 ASSERT(Top::has_pending_exception()); 1373 Top::clear_pending_exception(); 1374 return false; 1375 } 1376 TransferObject(obj, object); 1377 return true; 1378 } 1379 1380 1381 void Genesis::TransferNamedProperties(Handle<JSObject> from, 1382 Handle<JSObject> to) { 1383 if (from->HasFastProperties()) { 1384 Handle<DescriptorArray> descs = 1385 Handle<DescriptorArray>(from->map()->instance_descriptors()); 1386 for (int i = 0; i < descs->number_of_descriptors(); i++) { 1387 PropertyDetails details = PropertyDetails(descs->GetDetails(i)); 1388 switch (details.type()) { 1389 case FIELD: { 1390 HandleScope inner; 1391 Handle<String> key = Handle<String>(descs->GetKey(i)); 1392 int index = descs->GetFieldIndex(i); 1393 Handle<Object> value = Handle<Object>(from->FastPropertyAt(index)); 1394 SetProperty(to, key, value, details.attributes()); 1395 break; 1396 } 1397 case CONSTANT_FUNCTION: { 1398 HandleScope inner; 1399 Handle<String> key = Handle<String>(descs->GetKey(i)); 1400 Handle<JSFunction> fun = 1401 Handle<JSFunction>(descs->GetConstantFunction(i)); 1402 SetProperty(to, key, fun, details.attributes()); 1403 break; 1404 } 1405 case CALLBACKS: { 1406 LookupResult result; 1407 to->LocalLookup(descs->GetKey(i), &result); 1408 // If the property is already there we skip it 1409 if (result.IsProperty()) continue; 1410 HandleScope inner; 1411 ASSERT(!to->HasFastProperties()); 1412 // Add to dictionary. 1413 Handle<String> key = Handle<String>(descs->GetKey(i)); 1414 Handle<Object> callbacks(descs->GetCallbacksObject(i)); 1415 PropertyDetails d = 1416 PropertyDetails(details.attributes(), CALLBACKS, details.index()); 1417 SetNormalizedProperty(to, key, callbacks, d); 1418 break; 1419 } 1420 case MAP_TRANSITION: 1421 case CONSTANT_TRANSITION: 1422 case NULL_DESCRIPTOR: 1423 // Ignore non-properties. 1424 break; 1425 case NORMAL: 1426 // Do not occur since the from object has fast properties. 1427 case INTERCEPTOR: 1428 // No element in instance descriptors have interceptor type. 1429 UNREACHABLE(); 1430 break; 1431 } 1432 } 1433 } else { 1434 Handle<StringDictionary> properties = 1435 Handle<StringDictionary>(from->property_dictionary()); 1436 int capacity = properties->Capacity(); 1437 for (int i = 0; i < capacity; i++) { 1438 Object* raw_key(properties->KeyAt(i)); 1439 if (properties->IsKey(raw_key)) { 1440 ASSERT(raw_key->IsString()); 1441 // If the property is already there we skip it. 1442 LookupResult result; 1443 to->LocalLookup(String::cast(raw_key), &result); 1444 if (result.IsProperty()) continue; 1445 // Set the property. 1446 Handle<String> key = Handle<String>(String::cast(raw_key)); 1447 Handle<Object> value = Handle<Object>(properties->ValueAt(i)); 1448 if (value->IsJSGlobalPropertyCell()) { 1449 value = Handle<Object>(JSGlobalPropertyCell::cast(*value)->value()); 1450 } 1451 PropertyDetails details = properties->DetailsAt(i); 1452 SetProperty(to, key, value, details.attributes()); 1453 } 1454 } 1455 } 1456 } 1457 1458 1459 void Genesis::TransferIndexedProperties(Handle<JSObject> from, 1460 Handle<JSObject> to) { 1461 // Cloning the elements array is sufficient. 1462 Handle<FixedArray> from_elements = 1463 Handle<FixedArray>(FixedArray::cast(from->elements())); 1464 Handle<FixedArray> to_elements = Factory::CopyFixedArray(from_elements); 1465 to->set_elements(*to_elements); 1466 } 1467 1468 1469 void Genesis::TransferObject(Handle<JSObject> from, Handle<JSObject> to) { 1470 HandleScope outer; 1471 1472 ASSERT(!from->IsJSArray()); 1473 ASSERT(!to->IsJSArray()); 1474 1475 TransferNamedProperties(from, to); 1476 TransferIndexedProperties(from, to); 1477 1478 // Transfer the prototype (new map is needed). 1479 Handle<Map> old_to_map = Handle<Map>(to->map()); 1480 Handle<Map> new_to_map = Factory::CopyMapDropTransitions(old_to_map); 1481 new_to_map->set_prototype(from->map()->prototype()); 1482 to->set_map(*new_to_map); 1483 } 1484 1485 1486 void Genesis::MakeFunctionInstancePrototypeWritable() { 1487 // Make a new function map so all future functions 1488 // will have settable and enumerable prototype properties. 1489 HandleScope scope; 1490 1491 Handle<DescriptorArray> function_map_descriptors = 1492 ComputeFunctionInstanceDescriptor(false); 1493 Handle<Map> fm = Factory::CopyMapDropDescriptors(Top::function_map()); 1494 fm->set_instance_descriptors(*function_map_descriptors); 1495 Top::context()->global_context()->set_function_map(*fm); 1496 } 1497 1498 1499 void Genesis::AddSpecialFunction(Handle<JSObject> prototype, 1500 const char* name, 1501 Handle<Code> code) { 1502 Handle<String> key = Factory::LookupAsciiSymbol(name); 1503 Handle<Object> value = Handle<Object>(prototype->GetProperty(*key)); 1504 if (value->IsJSFunction()) { 1505 Handle<JSFunction> optimized = Factory::NewFunction(key, 1506 JS_OBJECT_TYPE, 1507 JSObject::kHeaderSize, 1508 code, 1509 false); 1510 optimized->shared()->DontAdaptArguments(); 1511 int len = global_context()->special_function_table()->length(); 1512 Handle<FixedArray> new_array = Factory::NewFixedArray(len + 3); 1513 for (int index = 0; index < len; index++) { 1514 new_array->set(index, 1515 global_context()->special_function_table()->get(index)); 1516 } 1517 new_array->set(len+0, *prototype); 1518 new_array->set(len+1, *value); 1519 new_array->set(len+2, *optimized); 1520 global_context()->set_special_function_table(*new_array); 1521 } 1522 } 1523 1524 1525 void Genesis::BuildSpecialFunctionTable() { 1526 HandleScope scope; 1527 Handle<JSObject> global = Handle<JSObject>(global_context()->global()); 1528 // Add special versions for some Array.prototype functions. 1529 Handle<JSFunction> function = 1530 Handle<JSFunction>( 1531 JSFunction::cast(global->GetProperty(Heap::Array_symbol()))); 1532 Handle<JSObject> visible_prototype = 1533 Handle<JSObject>(JSObject::cast(function->prototype())); 1534 // Remember to put those specializations on the hidden prototype if present. 1535 Handle<JSObject> special_prototype; 1536 Handle<Object> superproto(visible_prototype->GetPrototype()); 1537 if (superproto->IsJSObject() && 1538 JSObject::cast(*superproto)->map()->is_hidden_prototype()) { 1539 special_prototype = Handle<JSObject>::cast(superproto); 1540 } else { 1541 special_prototype = visible_prototype; 1542 } 1543 AddSpecialFunction(special_prototype, "pop", 1544 Handle<Code>(Builtins::builtin(Builtins::ArrayPop))); 1545 AddSpecialFunction(special_prototype, "push", 1546 Handle<Code>(Builtins::builtin(Builtins::ArrayPush))); 1547 AddSpecialFunction(special_prototype, "shift", 1548 Handle<Code>(Builtins::builtin(Builtins::ArrayShift))); 1549 AddSpecialFunction(special_prototype, "unshift", 1550 Handle<Code>(Builtins::builtin(Builtins::ArrayUnshift))); 1551 AddSpecialFunction(special_prototype, "slice", 1552 Handle<Code>(Builtins::builtin(Builtins::ArraySlice))); 1553 AddSpecialFunction(special_prototype, "splice", 1554 Handle<Code>(Builtins::builtin(Builtins::ArraySplice))); 1555 } 1556 1557 1558 Genesis::Genesis(Handle<Object> global_object, 1559 v8::Handle<v8::ObjectTemplate> global_template, 1560 v8::ExtensionConfiguration* extensions) { 1561 result_ = Handle<Context>::null(); 1562 // If V8 isn't running and cannot be initialized, just return. 1563 if (!V8::IsRunning() && !V8::Initialize(NULL)) return; 1564 1565 // Before creating the roots we must save the context and restore it 1566 // on all function exits. 1567 HandleScope scope; 1568 SaveContext saved_context; 1569 1570 Handle<Context> new_context = Snapshot::NewContextFromSnapshot(); 1571 if (!new_context.is_null()) { 1572 global_context_ = 1573 Handle<Context>::cast(GlobalHandles::Create(*new_context)); 1574 Top::set_context(*global_context_); 1575 i::Counters::contexts_created_by_snapshot.Increment(); 1576 result_ = global_context_; 1577 JSFunction* empty_function = 1578 JSFunction::cast(result_->function_map()->prototype()); 1579 empty_function_ = Handle<JSFunction>(empty_function); 1580 Handle<GlobalObject> inner_global; 1581 Handle<JSGlobalProxy> global_proxy = 1582 CreateNewGlobals(global_template, 1583 global_object, 1584 &inner_global); 1585 1586 HookUpGlobalProxy(inner_global, global_proxy); 1587 HookUpInnerGlobal(inner_global); 1588 1589 if (!ConfigureGlobalObjects(global_template)) return; 1590 } else { 1591 // We get here if there was no context snapshot. 1592 CreateRoots(); 1593 Handle<JSFunction> empty_function = CreateEmptyFunction(); 1594 Handle<GlobalObject> inner_global; 1595 Handle<JSGlobalProxy> global_proxy = 1596 CreateNewGlobals(global_template, global_object, &inner_global); 1597 HookUpGlobalProxy(inner_global, global_proxy); 1598 InitializeGlobal(inner_global, empty_function); 1599 if (!InstallNatives()) return; 1600 1601 MakeFunctionInstancePrototypeWritable(); 1602 BuildSpecialFunctionTable(); 1603 1604 if (!ConfigureGlobalObjects(global_template)) return; 1605 i::Counters::contexts_created_from_scratch.Increment(); 1606 } 1607 1608 result_ = global_context_; 1609 } 1610 1611 1612 // Support for thread preemption. 1613 1614 // Reserve space for statics needing saving and restoring. 1615 int Bootstrapper::ArchiveSpacePerThread() { 1616 return BootstrapperActive::ArchiveSpacePerThread(); 1617 } 1618 1619 1620 // Archive statics that are thread local. 1621 char* Bootstrapper::ArchiveState(char* to) { 1622 return BootstrapperActive::ArchiveState(to); 1623 } 1624 1625 1626 // Restore statics that are thread local. 1627 char* Bootstrapper::RestoreState(char* from) { 1628 return BootstrapperActive::RestoreState(from); 1629 } 1630 1631 1632 // Called when the top-level V8 mutex is destroyed. 1633 void Bootstrapper::FreeThreadResources() { 1634 ASSERT(!BootstrapperActive::IsActive()); 1635 } 1636 1637 1638 // Reserve space for statics needing saving and restoring. 1639 int BootstrapperActive::ArchiveSpacePerThread() { 1640 return sizeof(nesting_); 1641 } 1642 1643 1644 // Archive statics that are thread local. 1645 char* BootstrapperActive::ArchiveState(char* to) { 1646 *reinterpret_cast<int*>(to) = nesting_; 1647 nesting_ = 0; 1648 return to + sizeof(nesting_); 1649 } 1650 1651 1652 // Restore statics that are thread local. 1653 char* BootstrapperActive::RestoreState(char* from) { 1654 nesting_ = *reinterpret_cast<int*>(from); 1655 return from + sizeof(nesting_); 1656 } 1657 1658 } } // namespace v8::internal 1659
