JavaScriptCore/kjs/JSGlobalObject.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2008 Cameron Zwarich (cwzwarich@uwaterloo.ca)
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "JSGlobalObject.h"
  32
  33 #include "JSCallbackConstructor.h"
  34 #include "JSCallbackFunction.h"
  35 #include "JSCallbackObject.h"
  36
  37 #include "Arguments.h"
  38 #include "ArrayConstructor.h"
  39 #include "ArrayPrototype.h"
  40 #include "BooleanConstructor.h"
  41 #include "BooleanPrototype.h"
  42 #include "CodeBlock.h"
  43 #include "DateConstructor.h"
  44 #include "DatePrototype.h"
  45 #include "ErrorConstructor.h"
  46 #include "ErrorPrototype.h"
  47 #include "FunctionConstructor.h"
  48 #include "FunctionPrototype.h"
  49 #include "GlobalEvalFunction.h"
  50 #include "JSGlobalObjectFunctions.h"
  51 #include "JSLock.h"
  52 #include "Machine.h"
  53 #include "MathObject.h"
  54 #include "NativeErrorConstructor.h"
  55 #include "NativeErrorPrototype.h"
  56 #include "NumberConstructor.h"
  57 #include "NumberPrototype.h"
  58 #include "ObjectConstructor.h"
  59 #include "ObjectPrototype.h"
  60 #include "Profiler.h"
  61 #include "PrototypeFunction.h"
  62 #include "RegExpConstructor.h"
  63 #include "RegExpMatchesArray.h"
  64 #include "RegExpObject.h"
  65 #include "RegExpPrototype.h"
  66 #include "ScopeChainMark.h"
  67 #include "StringConstructor.h"
  68 #include "StringPrototype.h"
  69 #include "debugger.h"
  70
  71 namespace JSC {
  72
  73 ASSERT_CLASS_FITS_IN_CELL(JSGlobalObject);
  74
  75 // Default number of ticks before a timeout check should be done.
  76 static const int initialTickCountThreshold = 255;
  77
  78 // Preferred number of milliseconds between each timeout check
  79 static const int preferredScriptCheckTimeInterval = 1000;
  80
  81 static inline void markIfNeeded(JSValue* v)
  82 {
  83     if (v && !v->marked())
  84         v->mark();
  85 }
  86
  87 static inline void markIfNeeded(const RefPtr<StructureID>& s)
  88 {
  89     if (s)
  90         s->mark();
  91 }
  92
  93 JSGlobalObject::~JSGlobalObject()
  94 {
  95     ASSERT(JSLock::currentThreadIsHoldingLock());
  96
  97     if (d()->debugger)
  98         d()->debugger->detach(this);
  99
 100     Profiler** profiler = Profiler::enabledProfilerReference();
 101     if (UNLIKELY(*profiler != 0)) {
 102         (*profiler)->stopProfiling(globalExec(), UString());
 103     }
 104
 105     d()->next->d()->prev = d()->prev;
 106     d()->prev->d()->next = d()->next;
 107     JSGlobalObject*& headObject = head();
 108     if (headObject == this)
 109         headObject = d()->next;
 110     if (headObject == this)
 111         headObject = 0;
 112
 113     HashSet<ProgramCodeBlock*>::const_iterator end = codeBlocks().end();
 114     for (HashSet<ProgramCodeBlock*>::const_iterator it = codeBlocks().begin(); it != end; ++it)
 115         (*it)->globalObject = 0;
 116
 117     RegisterFile& registerFile = globalData()->machine->registerFile();
 118     if (registerFile.globalObject() == this) {
 119         registerFile.setGlobalObject(0);
 120         registerFile.setNumGlobals(0);
 121     }
 122     delete d();
 123 }
 124
 125 void JSGlobalObject::init(JSObject* thisValue)
 126 {
 127     ASSERT(JSLock::currentThreadIsHoldingLock());
 128
 129     d()->globalData = Heap::heap(this)->globalData();
 130
 131     if (JSGlobalObject*& headObject = head()) {
 132         d()->prev = headObject;
 133         d()->next = headObject->d()->next;
 134         headObject->d()->next->d()->prev = this;
 135         headObject->d()->next = this;
 136     } else
 137         headObject = d()->next = d()->prev = this;
 138
 139     d()->recursion = 0;
 140     d()->debugger = 0;
 141
 142     d()->globalExec.set(new ExecState(this, thisValue, d()->globalScopeChain.node()));
 143
 144     d()->profileGroup = 0;
 145
 146     reset(prototype());
 147 }
 148
 149 void JSGlobalObject::put(ExecState* exec, const Identifier& propertyName, JSValue* value, PutPropertySlot& slot)
 150 {
 151     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
 152
 153     if (symbolTablePut(propertyName, value))
 154         return;
 155     JSVariableObject::put(exec, propertyName, value, slot);
 156 }
 157
 158 void JSGlobalObject::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue* value, unsigned attributes)
 159 {
 160     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
 161
 162     if (symbolTablePutWithAttributes(propertyName, value, attributes))
 163         return;
 164
 165     JSValue* valueBefore = getDirect(propertyName);
 166     PutPropertySlot slot;
 167     JSVariableObject::put(exec, propertyName, value, slot);
 168     if (!valueBefore) {
 169         if (JSValue* valueAfter = getDirect(propertyName))
 170             putDirect(propertyName, valueAfter, attributes);
 171     }
 172 }
 173
 174 void JSGlobalObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunc)
 175 {
 176     PropertySlot slot;
 177     if (!symbolTableGet(propertyName, slot))
 178         JSVariableObject::defineGetter(exec, propertyName, getterFunc);
 179 }
 180
 181 void JSGlobalObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunc)
 182 {
 183     PropertySlot slot;
 184     if (!symbolTableGet(propertyName, slot))
 185         JSVariableObject::defineSetter(exec, propertyName, setterFunc);
 186 }
 187
 188 static inline JSObject* lastInPrototypeChain(JSObject* object)
 189 {
 190     JSObject* o = object;
 191     while (o->prototype()->isObject())
 192         o = static_cast<JSObject*>(o->prototype());
 193     return o;
 194 }
 195
 196 void JSGlobalObject::reset(JSValue* prototype)
 197 {
 198     // Clear before inititalizing, to avoid calling mark() on stale pointers --
 199     // which would be wasteful -- or uninitialized pointers -- which would be
 200     // dangerous. (The allocations below may cause a GC.)
 201
 202     ASSERT(!hasCustomProperties());
 203     symbolTable().clear();
 204     setRegisters(0, 0, 0);
 205
 206     ExecState* exec = d()->globalExec.get();
 207
 208     // Prototypes
 209
 210     d()->functionPrototype = new (exec) FunctionPrototype(exec);
 211     d()->functionStructure = JSFunction::createStructureID(d()->functionPrototype);
 212     d()->callbackFunctionStructure = JSCallbackFunction::createStructureID(d()->functionPrototype);
 213     d()->prototypeFunctionStructure = PrototypeFunction::createStructureID(d()->functionPrototype);
 214     d()->functionPrototype->addFunctionProperties(exec, d()->prototypeFunctionStructure.get());
 215     d()->objectPrototype = new (exec) ObjectPrototype(exec, d()->prototypeFunctionStructure.get());
 216     d()->emptyObjectStructure = d()->objectPrototype->inheritorID();
 217     d()->functionPrototype->setPrototype(d()->objectPrototype);
 218     d()->argumentsStructure = Arguments::createStructureID(d()->objectPrototype);
 219     d()->callbackConstructorStructure = JSCallbackConstructor::createStructureID(d()->objectPrototype);
 220     d()->callbackObjectStructure = JSCallbackObject<JSObject>::createStructureID(d()->objectPrototype);
 221     d()->arrayPrototype = new (exec) ArrayPrototype(ArrayPrototype::createStructureID(d()->objectPrototype));
 222     d()->arrayStructure = JSArray::createStructureID(d()->arrayPrototype);
 223     d()->regExpMatchesArrayStructure = RegExpMatchesArray::createStructureID(d()->arrayPrototype);
 224     d()->stringPrototype = new (exec) StringPrototype(exec, StringPrototype::createStructureID(d()->objectPrototype));
 225     d()->stringObjectStructure = StringObject::createStructureID(d()->stringPrototype);
 226     d()->booleanPrototype = new (exec) BooleanPrototype(exec, BooleanPrototype::createStructureID(d()->objectPrototype), d()->prototypeFunctionStructure.get());
 227     d()->booleanObjectStructure = BooleanObject::createStructureID(d()->booleanPrototype);
 228     d()->numberPrototype = new (exec) NumberPrototype(exec, NumberPrototype::createStructureID(d()->objectPrototype), d()->prototypeFunctionStructure.get());
 229     d()->numberObjectStructure = NumberObject::createStructureID(d()->numberPrototype);
 230     d()->datePrototype = new (exec) DatePrototype(exec, DatePrototype::createStructureID(d()->objectPrototype));
 231     d()->dateStructure = DateInstance::createStructureID(d()->datePrototype);
 232     d()->regExpPrototype = new (exec) RegExpPrototype(exec, RegExpPrototype::createStructureID(d()->objectPrototype), d()->prototypeFunctionStructure.get());
 233     d()->regExpStructure = RegExpObject::createStructureID(d()->regExpPrototype);
 234     ErrorPrototype* errorPrototype = new (exec) ErrorPrototype(exec, ErrorPrototype::createStructureID(d()->objectPrototype), d()->prototypeFunctionStructure.get());
 235     d()->errorStructure = ErrorInstance::createStructureID(errorPrototype);
 236
 237     RefPtr<StructureID> nativeErrorPrototypeStructure = NativeErrorPrototype::createStructureID(errorPrototype);
 238
 239     NativeErrorPrototype* evalErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "EvalError", "EvalError");
 240     NativeErrorPrototype* rangeErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "RangeError", "RangeError");
 241     NativeErrorPrototype* referenceErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "ReferenceError", "ReferenceError");
 242     NativeErrorPrototype* syntaxErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "SyntaxError", "SyntaxError");
 243     NativeErrorPrototype* typeErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "TypeError", "TypeError");
 244     NativeErrorPrototype* URIErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "URIError", "URIError");
 245
 246     // Constructors
 247
 248     JSValue* objectConstructor = new (exec) ObjectConstructor(exec, ObjectConstructor::createStructureID(d()->functionPrototype), d()->objectPrototype);
 249     JSValue* functionConstructor = new (exec) FunctionConstructor(exec, FunctionConstructor::createStructureID(d()->functionPrototype), d()->functionPrototype);
 250     JSValue* arrayConstructor = new (exec) ArrayConstructor(exec, ArrayConstructor::createStructureID(d()->functionPrototype), d()->arrayPrototype);
 251     JSValue* stringConstructor = new (exec) StringConstructor(exec, StringConstructor::createStructureID(d()->functionPrototype), d()->prototypeFunctionStructure.get(), d()->stringPrototype);
 252     JSValue* booleanConstructor = new (exec) BooleanConstructor(exec, BooleanConstructor::createStructureID(d()->functionPrototype), d()->booleanPrototype);
 253     JSValue* numberConstructor = new (exec) NumberConstructor(exec, NumberConstructor::createStructureID(d()->functionPrototype), d()->numberPrototype);
 254     JSValue* dateConstructor = new (exec) DateConstructor(exec, DateConstructor::createStructureID(d()->functionPrototype), d()->prototypeFunctionStructure.get(), d()->datePrototype);
 255
 256     d()->regExpConstructor = new (exec) RegExpConstructor(exec, RegExpConstructor::createStructureID(d()->functionPrototype), d()->regExpPrototype);
 257
 258     d()->errorConstructor = new (exec) ErrorConstructor(exec, ErrorConstructor::createStructureID(d()->functionPrototype), errorPrototype);
 259
 260     RefPtr<StructureID> nativeErrorStructure = NativeErrorConstructor::createStructureID(d()->functionPrototype);
 261
 262     d()->evalErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, evalErrorPrototype);
 263     d()->rangeErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, rangeErrorPrototype);
 264     d()->referenceErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, referenceErrorPrototype);
 265     d()->syntaxErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, syntaxErrorPrototype);
 266     d()->typeErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, typeErrorPrototype);
 267     d()->URIErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, URIErrorPrototype);
 268
 269     d()->functionPrototype->putDirect(exec->propertyNames().constructor, functionConstructor, DontEnum);
 270
 271     d()->objectPrototype->putDirect(exec->propertyNames().constructor, objectConstructor, DontEnum);
 272     d()->functionPrototype->putDirect(exec->propertyNames().constructor, functionConstructor, DontEnum);
 273     d()->arrayPrototype->putDirect(exec->propertyNames().constructor, arrayConstructor, DontEnum);
 274     d()->booleanPrototype->putDirect(exec->propertyNames().constructor, booleanConstructor, DontEnum);
 275     d()->stringPrototype->putDirect(exec->propertyNames().constructor, stringConstructor, DontEnum);
 276     d()->numberPrototype->putDirect(exec->propertyNames().constructor, numberConstructor, DontEnum);
 277     d()->datePrototype->putDirect(exec->propertyNames().constructor, dateConstructor, DontEnum);
 278     d()->regExpPrototype->putDirect(exec->propertyNames().constructor, d()->regExpConstructor, DontEnum);
 279     errorPrototype->putDirect(exec->propertyNames().constructor, d()->errorConstructor, DontEnum);
 280     evalErrorPrototype->putDirect(exec->propertyNames().constructor, d()->evalErrorConstructor, DontEnum);
 281     rangeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->rangeErrorConstructor, DontEnum);
 282     referenceErrorPrototype->putDirect(exec->propertyNames().constructor, d()->referenceErrorConstructor, DontEnum);
 283     syntaxErrorPrototype->putDirect(exec->propertyNames().constructor, d()->syntaxErrorConstructor, DontEnum);
 284     typeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->typeErrorConstructor, DontEnum);
 285     URIErrorPrototype->putDirect(exec->propertyNames().constructor, d()->URIErrorConstructor, DontEnum);
 286
 287     // Set global constructors
 288
 289     // FIXME: These properties could be handled by a static hash table.
 290
 291     putDirect(Identifier(exec, "Object"), objectConstructor, DontEnum);
 292     putDirect(Identifier(exec, "Function"), functionConstructor, DontEnum);
 293     putDirect(Identifier(exec, "Array"), arrayConstructor, DontEnum);
 294     putDirect(Identifier(exec, "Boolean"), booleanConstructor, DontEnum);
 295     putDirect(Identifier(exec, "String"), stringConstructor, DontEnum);
 296     putDirect(Identifier(exec, "Number"), numberConstructor, DontEnum);
 297     putDirect(Identifier(exec, "Date"), dateConstructor, DontEnum);
 298     putDirect(Identifier(exec, "RegExp"), d()->regExpConstructor, DontEnum);
 299     putDirect(Identifier(exec, "Error"), d()->errorConstructor, DontEnum);
 300     putDirect(Identifier(exec, "EvalError"), d()->evalErrorConstructor);
 301     putDirect(Identifier(exec, "RangeError"), d()->rangeErrorConstructor);
 302     putDirect(Identifier(exec, "ReferenceError"), d()->referenceErrorConstructor);
 303     putDirect(Identifier(exec, "SyntaxError"), d()->syntaxErrorConstructor);
 304     putDirect(Identifier(exec, "TypeError"), d()->typeErrorConstructor);
 305     putDirect(Identifier(exec, "URIError"), d()->URIErrorConstructor);
 306
 307     // Set global values.
 308     GlobalPropertyInfo staticGlobals[] = {
 309         GlobalPropertyInfo(Identifier(exec, "Math"), new (exec) MathObject(exec, MathObject::createStructureID(d()->objectPrototype)), DontEnum | DontDelete),
 310         GlobalPropertyInfo(Identifier(exec, "NaN"), jsNaN(exec), DontEnum | DontDelete),
 311         GlobalPropertyInfo(Identifier(exec, "Infinity"), jsNumber(exec, Inf), DontEnum | DontDelete),
 312         GlobalPropertyInfo(Identifier(exec, "undefined"), jsUndefined(), DontEnum | DontDelete)
 313     };
 314
 315     addStaticGlobals(staticGlobals, sizeof(staticGlobals) / sizeof(GlobalPropertyInfo));
 316
 317     // Set global functions.
 318
 319     d()->evalFunction = new (exec) GlobalEvalFunction(exec, GlobalEvalFunction::createStructureID(d()->functionPrototype), 1, exec->propertyNames().eval, globalFuncEval, this);
 320     putDirectFunction(exec, d()->evalFunction, DontEnum);
 321     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 2, Identifier(exec, "parseInt"), globalFuncParseInt), DontEnum);
 322     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "parseFloat"), globalFuncParseFloat), DontEnum);
 323     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "isNaN"), globalFuncIsNaN), DontEnum);
 324     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "isFinite"), globalFuncIsFinite), DontEnum);
 325     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "escape"), globalFuncEscape), DontEnum);
 326     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "unescape"), globalFuncUnescape), DontEnum);
 327     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "decodeURI"), globalFuncDecodeURI), DontEnum);
 328     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "decodeURIComponent"), globalFuncDecodeURIComponent), DontEnum);
 329     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "encodeURI"), globalFuncEncodeURI), DontEnum);
 330     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "encodeURIComponent"), globalFuncEncodeURIComponent), DontEnum);
 331 #ifndef NDEBUG
 332     putDirectFunction(exec, new (exec) PrototypeFunction(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "kjsprint"), globalFuncKJSPrint), DontEnum);
 333 #endif
 334
 335     resetPrototype(prototype);
 336 }
 337
 338 // Set prototype, and also insert the object prototype at the end of the chain.
 339 void JSGlobalObject::resetPrototype(JSValue* prototype)
 340 {
 341     setPrototype(prototype);
 342     lastInPrototypeChain(this)->setPrototype(d()->objectPrototype);
 343 }
 344
 345 void JSGlobalObject::setTimeoutTime(unsigned timeoutTime)
 346 {
 347     globalData()->machine->setTimeoutTime(timeoutTime);
 348 }
 349
 350 void JSGlobalObject::startTimeoutCheck()
 351 {
 352     globalData()->machine->startTimeoutCheck();
 353 }
 354
 355 void JSGlobalObject::stopTimeoutCheck()
 356 {
 357     globalData()->machine->stopTimeoutCheck();
 358 }
 359
 360 void JSGlobalObject::mark()
 361 {
 362     JSVariableObject::mark();
 363
 364     HashSet<ProgramCodeBlock*>::const_iterator end = codeBlocks().end();
 365     for (HashSet<ProgramCodeBlock*>::const_iterator it = codeBlocks().begin(); it != end; ++it)
 366         (*it)->mark();
 367
 368     RegisterFile& registerFile = globalData()->machine->registerFile();
 369     if (registerFile.globalObject() == this)
 370         registerFile.markGlobals(globalData()->heap);
 371
 372     markIfNeeded(d()->globalExec->exception());
 373
 374     markIfNeeded(d()->regExpConstructor);
 375     markIfNeeded(d()->errorConstructor);
 376     markIfNeeded(d()->evalErrorConstructor);
 377     markIfNeeded(d()->rangeErrorConstructor);
 378     markIfNeeded(d()->referenceErrorConstructor);
 379     markIfNeeded(d()->syntaxErrorConstructor);
 380     markIfNeeded(d()->typeErrorConstructor);
 381     markIfNeeded(d()->URIErrorConstructor);
 382
 383     markIfNeeded(d()->evalFunction);
 384
 385     markIfNeeded(d()->objectPrototype);
 386     markIfNeeded(d()->functionPrototype);
 387     markIfNeeded(d()->arrayPrototype);
 388     markIfNeeded(d()->booleanPrototype);
 389     markIfNeeded(d()->stringPrototype);
 390     markIfNeeded(d()->numberPrototype);
 391     markIfNeeded(d()->datePrototype);
 392     markIfNeeded(d()->regExpPrototype);
 393
 394     markIfNeeded(d()->errorStructure);
 395
 396     // No need to mark the other structures, because their prototypes are all
 397     // guaranteed to be referenced elsewhere.
 398
 399     Register* registerArray = d()->registerArray.get();
 400     if (!registerArray)
 401         return;
 402
 403     size_t size = d()->registerArraySize;
 404     for (size_t i = 0; i < size; ++i) {
 405         Register& r = registerArray[i];
 406         if (!r.marked())
 407             r.mark();
 408     }
 409 }
 410
 411 JSGlobalObject* JSGlobalObject::toGlobalObject(ExecState*) const
 412 {
 413     return const_cast<JSGlobalObject*>(this);
 414 }
 415
 416 ExecState* JSGlobalObject::globalExec()
 417 {
 418     return d()->globalExec.get();
 419 }
 420
 421 bool JSGlobalObject::isDynamicScope() const
 422 {
 423     return true;
 424 }
 425
 426 void JSGlobalObject::copyGlobalsFrom(RegisterFile& registerFile)
 427 {
 428     ASSERT(!d()->registerArray);
 429     ASSERT(!d()->registerArraySize);
 430
 431     int numGlobals = registerFile.numGlobals();
 432     if (!numGlobals) {
 433         d()->registers = 0;
 434         return;
 435     }
 436
 437     Register* registerArray = copyRegisterArray(registerFile.lastGlobal(), numGlobals);
 438     setRegisters(registerArray + numGlobals, registerArray, numGlobals);
 439 }
 440
 441 void JSGlobalObject::copyGlobalsTo(RegisterFile& registerFile)
 442 {
 443     JSGlobalObject* lastGlobalObject = registerFile.globalObject();
 444     if (lastGlobalObject && lastGlobalObject != this)
 445         lastGlobalObject->copyGlobalsFrom(registerFile);
 446
 447     registerFile.setGlobalObject(this);
 448     registerFile.setNumGlobals(symbolTable().size());
 449
 450     if (d()->registerArray) {
 451         memcpy(registerFile.base() - d()->registerArraySize, d()->registerArray.get(), d()->registerArraySize * sizeof(Register));
 452         setRegisters(registerFile.base(), 0, 0);
 453     }
 454 }
 455
 456 void* JSGlobalObject::operator new(size_t size, JSGlobalData* globalData)
 457 {
 458 #ifdef JAVASCRIPTCORE_BUILDING_ALL_IN_ONE_FILE
 459     return globalData->heap->inlineAllocate(size);
 460 #else
 461     return globalData->heap->allocate(size);
 462 #endif
 463 }
 464
 465 } // namespace JSC