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      1 /*
      2  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008 Cameron Zwarich (cwzwarich (at) 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 "JSFunction.h"
     51 #include "JSGlobalObjectFunctions.h"
     52 #include "JSLock.h"
     53 #include "JSONObject.h"
     54 #include "Interpreter.h"
     55 #include "MathObject.h"
     56 #include "NativeErrorConstructor.h"
     57 #include "NativeErrorPrototype.h"
     58 #include "NumberConstructor.h"
     59 #include "NumberPrototype.h"
     60 #include "ObjectConstructor.h"
     61 #include "ObjectPrototype.h"
     62 #include "Profiler.h"
     63 #include "PrototypeFunction.h"
     64 #include "RegExpConstructor.h"
     65 #include "RegExpMatchesArray.h"
     66 #include "RegExpObject.h"
     67 #include "RegExpPrototype.h"
     68 #include "ScopeChainMark.h"
     69 #include "StringConstructor.h"
     70 #include "StringPrototype.h"
     71 #include "Debugger.h"
     72 
     73 namespace JSC {
     74 
     75 ASSERT_CLASS_FITS_IN_CELL(JSGlobalObject);
     76 
     77 // Default number of ticks before a timeout check should be done.
     78 static const int initialTickCountThreshold = 255;
     79 
     80 // Preferred number of milliseconds between each timeout check
     81 static const int preferredScriptCheckTimeInterval = 1000;
     82 
     83 static inline void markIfNeeded(MarkStack& markStack, JSValue v)
     84 {
     85     if (v)
     86         markStack.append(v);
     87 }
     88 
     89 static inline void markIfNeeded(MarkStack& markStack, const RefPtr<Structure>& s)
     90 {
     91     if (s)
     92         markIfNeeded(markStack, s->storedPrototype());
     93 }
     94 
     95 JSGlobalObject::~JSGlobalObject()
     96 {
     97     ASSERT(JSLock::currentThreadIsHoldingLock());
     98 
     99     if (d()->debugger)
    100         d()->debugger->detach(this);
    101 
    102     Profiler** profiler = Profiler::enabledProfilerReference();
    103     if (UNLIKELY(*profiler != 0)) {
    104         (*profiler)->stopProfiling(globalExec(), UString());
    105     }
    106 
    107     d()->next->d()->prev = d()->prev;
    108     d()->prev->d()->next = d()->next;
    109     JSGlobalObject*& headObject = head();
    110     if (headObject == this)
    111         headObject = d()->next;
    112     if (headObject == this)
    113         headObject = 0;
    114 
    115     HashSet<GlobalCodeBlock*>::const_iterator end = codeBlocks().end();
    116     for (HashSet<GlobalCodeBlock*>::const_iterator it = codeBlocks().begin(); it != end; ++it)
    117         (*it)->clearGlobalObject();
    118 
    119     RegisterFile& registerFile = globalData()->interpreter->registerFile();
    120     if (registerFile.globalObject() == this) {
    121         registerFile.setGlobalObject(0);
    122         registerFile.setNumGlobals(0);
    123     }
    124     d()->destructor(d());
    125 }
    126 
    127 void JSGlobalObject::init(JSObject* thisValue)
    128 {
    129     ASSERT(JSLock::currentThreadIsHoldingLock());
    130 
    131     structure()->disableSpecificFunctionTracking();
    132 
    133     d()->globalData = Heap::heap(this)->globalData();
    134     d()->globalScopeChain = ScopeChain(this, d()->globalData.get(), this, thisValue);
    135 
    136     JSGlobalObject::globalExec()->init(0, 0, d()->globalScopeChain.node(), CallFrame::noCaller(), 0, 0, 0);
    137 
    138     if (JSGlobalObject*& headObject = head()) {
    139         d()->prev = headObject;
    140         d()->next = headObject->d()->next;
    141         headObject->d()->next->d()->prev = this;
    142         headObject->d()->next = this;
    143     } else
    144         headObject = d()->next = d()->prev = this;
    145 
    146     d()->recursion = 0;
    147     d()->debugger = 0;
    148 
    149     d()->profileGroup = 0;
    150 
    151     reset(prototype());
    152 }
    153 
    154 void JSGlobalObject::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
    155 {
    156     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
    157 
    158     if (symbolTablePut(propertyName, value))
    159         return;
    160     JSVariableObject::put(exec, propertyName, value, slot);
    161 }
    162 
    163 void JSGlobalObject::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes)
    164 {
    165     ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
    166 
    167     if (symbolTablePutWithAttributes(propertyName, value, attributes))
    168         return;
    169 
    170     JSValue valueBefore = getDirect(propertyName);
    171     PutPropertySlot slot;
    172     JSVariableObject::put(exec, propertyName, value, slot);
    173     if (!valueBefore) {
    174         JSValue valueAfter = getDirect(propertyName);
    175         if (valueAfter)
    176             JSObject::putWithAttributes(exec, propertyName, valueAfter, attributes);
    177     }
    178 }
    179 
    180 void JSGlobalObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunc, unsigned attributes)
    181 {
    182     PropertySlot slot;
    183     if (!symbolTableGet(propertyName, slot))
    184         JSVariableObject::defineGetter(exec, propertyName, getterFunc, attributes);
    185 }
    186 
    187 void JSGlobalObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunc, unsigned attributes)
    188 {
    189     PropertySlot slot;
    190     if (!symbolTableGet(propertyName, slot))
    191         JSVariableObject::defineSetter(exec, propertyName, setterFunc, attributes);
    192 }
    193 
    194 static inline JSObject* lastInPrototypeChain(JSObject* object)
    195 {
    196     JSObject* o = object;
    197     while (o->prototype().isObject())
    198         o = asObject(o->prototype());
    199     return o;
    200 }
    201 
    202 void JSGlobalObject::reset(JSValue prototype)
    203 {
    204     ExecState* exec = JSGlobalObject::globalExec();
    205 
    206     // Prototypes
    207 
    208     d()->functionPrototype = new (exec) FunctionPrototype(exec, FunctionPrototype::createStructure(jsNull())); // The real prototype will be set once ObjectPrototype is created.
    209     d()->prototypeFunctionStructure = PrototypeFunction::createStructure(d()->functionPrototype);
    210     NativeFunctionWrapper* callFunction = 0;
    211     NativeFunctionWrapper* applyFunction = 0;
    212     d()->functionPrototype->addFunctionProperties(exec, d()->prototypeFunctionStructure.get(), &callFunction, &applyFunction);
    213     d()->callFunction = callFunction;
    214     d()->applyFunction = applyFunction;
    215     d()->objectPrototype = new (exec) ObjectPrototype(exec, ObjectPrototype::createStructure(jsNull()), d()->prototypeFunctionStructure.get());
    216     d()->functionPrototype->structure()->setPrototypeWithoutTransition(d()->objectPrototype);
    217 
    218     d()->emptyObjectStructure = d()->objectPrototype->inheritorID();
    219 
    220     d()->functionStructure = JSFunction::createStructure(d()->functionPrototype);
    221     d()->callbackFunctionStructure = JSCallbackFunction::createStructure(d()->functionPrototype);
    222     d()->argumentsStructure = Arguments::createStructure(d()->objectPrototype);
    223     d()->callbackConstructorStructure = JSCallbackConstructor::createStructure(d()->objectPrototype);
    224     d()->callbackObjectStructure = JSCallbackObject<JSObject>::createStructure(d()->objectPrototype);
    225 
    226     d()->arrayPrototype = new (exec) ArrayPrototype(ArrayPrototype::createStructure(d()->objectPrototype));
    227     d()->arrayStructure = JSArray::createStructure(d()->arrayPrototype);
    228     d()->regExpMatchesArrayStructure = RegExpMatchesArray::createStructure(d()->arrayPrototype);
    229 
    230     d()->stringPrototype = new (exec) StringPrototype(exec, StringPrototype::createStructure(d()->objectPrototype));
    231     d()->stringObjectStructure = StringObject::createStructure(d()->stringPrototype);
    232 
    233     d()->booleanPrototype = new (exec) BooleanPrototype(exec, BooleanPrototype::createStructure(d()->objectPrototype), d()->prototypeFunctionStructure.get());
    234     d()->booleanObjectStructure = BooleanObject::createStructure(d()->booleanPrototype);
    235 
    236     d()->numberPrototype = new (exec) NumberPrototype(exec, NumberPrototype::createStructure(d()->objectPrototype), d()->prototypeFunctionStructure.get());
    237     d()->numberObjectStructure = NumberObject::createStructure(d()->numberPrototype);
    238 
    239     d()->datePrototype = new (exec) DatePrototype(exec, DatePrototype::createStructure(d()->objectPrototype));
    240     d()->dateStructure = DateInstance::createStructure(d()->datePrototype);
    241 
    242     d()->regExpPrototype = new (exec) RegExpPrototype(exec, RegExpPrototype::createStructure(d()->objectPrototype), d()->prototypeFunctionStructure.get());
    243     d()->regExpStructure = RegExpObject::createStructure(d()->regExpPrototype);
    244 
    245     d()->methodCallDummy = constructEmptyObject(exec);
    246 
    247     ErrorPrototype* errorPrototype = new (exec) ErrorPrototype(exec, ErrorPrototype::createStructure(d()->objectPrototype), d()->prototypeFunctionStructure.get());
    248     d()->errorStructure = ErrorInstance::createStructure(errorPrototype);
    249 
    250     RefPtr<Structure> nativeErrorPrototypeStructure = NativeErrorPrototype::createStructure(errorPrototype);
    251 
    252     NativeErrorPrototype* evalErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "EvalError", "EvalError");
    253     NativeErrorPrototype* rangeErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "RangeError", "RangeError");
    254     NativeErrorPrototype* referenceErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "ReferenceError", "ReferenceError");
    255     NativeErrorPrototype* syntaxErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "SyntaxError", "SyntaxError");
    256     NativeErrorPrototype* typeErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "TypeError", "TypeError");
    257     NativeErrorPrototype* URIErrorPrototype = new (exec) NativeErrorPrototype(exec, nativeErrorPrototypeStructure, "URIError", "URIError");
    258 
    259     // Constructors
    260 
    261     JSCell* objectConstructor = new (exec) ObjectConstructor(exec, ObjectConstructor::createStructure(d()->functionPrototype), d()->objectPrototype, d()->prototypeFunctionStructure.get());
    262     JSCell* functionConstructor = new (exec) FunctionConstructor(exec, FunctionConstructor::createStructure(d()->functionPrototype), d()->functionPrototype);
    263     JSCell* arrayConstructor = new (exec) ArrayConstructor(exec, ArrayConstructor::createStructure(d()->functionPrototype), d()->arrayPrototype, d()->prototypeFunctionStructure.get());
    264     JSCell* stringConstructor = new (exec) StringConstructor(exec, StringConstructor::createStructure(d()->functionPrototype), d()->prototypeFunctionStructure.get(), d()->stringPrototype);
    265     JSCell* booleanConstructor = new (exec) BooleanConstructor(exec, BooleanConstructor::createStructure(d()->functionPrototype), d()->booleanPrototype);
    266     JSCell* numberConstructor = new (exec) NumberConstructor(exec, NumberConstructor::createStructure(d()->functionPrototype), d()->numberPrototype);
    267     JSCell* dateConstructor = new (exec) DateConstructor(exec, DateConstructor::createStructure(d()->functionPrototype), d()->prototypeFunctionStructure.get(), d()->datePrototype);
    268 
    269     d()->regExpConstructor = new (exec) RegExpConstructor(exec, RegExpConstructor::createStructure(d()->functionPrototype), d()->regExpPrototype);
    270 
    271     d()->errorConstructor = new (exec) ErrorConstructor(exec, ErrorConstructor::createStructure(d()->functionPrototype), errorPrototype);
    272 
    273     RefPtr<Structure> nativeErrorStructure = NativeErrorConstructor::createStructure(d()->functionPrototype);
    274 
    275     d()->evalErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, evalErrorPrototype);
    276     d()->rangeErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, rangeErrorPrototype);
    277     d()->referenceErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, referenceErrorPrototype);
    278     d()->syntaxErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, syntaxErrorPrototype);
    279     d()->typeErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, typeErrorPrototype);
    280     d()->URIErrorConstructor = new (exec) NativeErrorConstructor(exec, nativeErrorStructure, URIErrorPrototype);
    281 
    282     d()->objectPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, objectConstructor, DontEnum);
    283     d()->functionPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, functionConstructor, DontEnum);
    284     d()->arrayPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, arrayConstructor, DontEnum);
    285     d()->booleanPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, booleanConstructor, DontEnum);
    286     d()->stringPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, stringConstructor, DontEnum);
    287     d()->numberPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, numberConstructor, DontEnum);
    288     d()->datePrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, dateConstructor, DontEnum);
    289     d()->regExpPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, d()->regExpConstructor, DontEnum);
    290     errorPrototype->putDirectFunctionWithoutTransition(exec->propertyNames().constructor, d()->errorConstructor, DontEnum);
    291 
    292     evalErrorPrototype->putDirect(exec->propertyNames().constructor, d()->evalErrorConstructor, DontEnum);
    293     rangeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->rangeErrorConstructor, DontEnum);
    294     referenceErrorPrototype->putDirect(exec->propertyNames().constructor, d()->referenceErrorConstructor, DontEnum);
    295     syntaxErrorPrototype->putDirect(exec->propertyNames().constructor, d()->syntaxErrorConstructor, DontEnum);
    296     typeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->typeErrorConstructor, DontEnum);
    297     URIErrorPrototype->putDirect(exec->propertyNames().constructor, d()->URIErrorConstructor, DontEnum);
    298 
    299     // Set global constructors
    300 
    301     // FIXME: These properties could be handled by a static hash table.
    302 
    303     putDirectFunctionWithoutTransition(Identifier(exec, "Object"), objectConstructor, DontEnum);
    304     putDirectFunctionWithoutTransition(Identifier(exec, "Function"), functionConstructor, DontEnum);
    305     putDirectFunctionWithoutTransition(Identifier(exec, "Array"), arrayConstructor, DontEnum);
    306     putDirectFunctionWithoutTransition(Identifier(exec, "Boolean"), booleanConstructor, DontEnum);
    307     putDirectFunctionWithoutTransition(Identifier(exec, "String"), stringConstructor, DontEnum);
    308     putDirectFunctionWithoutTransition(Identifier(exec, "Number"), numberConstructor, DontEnum);
    309     putDirectFunctionWithoutTransition(Identifier(exec, "Date"), dateConstructor, DontEnum);
    310     putDirectFunctionWithoutTransition(Identifier(exec, "RegExp"), d()->regExpConstructor, DontEnum);
    311     putDirectFunctionWithoutTransition(Identifier(exec, "Error"), d()->errorConstructor, DontEnum);
    312     putDirectFunctionWithoutTransition(Identifier(exec, "EvalError"), d()->evalErrorConstructor);
    313     putDirectFunctionWithoutTransition(Identifier(exec, "RangeError"), d()->rangeErrorConstructor);
    314     putDirectFunctionWithoutTransition(Identifier(exec, "ReferenceError"), d()->referenceErrorConstructor);
    315     putDirectFunctionWithoutTransition(Identifier(exec, "SyntaxError"), d()->syntaxErrorConstructor);
    316     putDirectFunctionWithoutTransition(Identifier(exec, "TypeError"), d()->typeErrorConstructor);
    317     putDirectFunctionWithoutTransition(Identifier(exec, "URIError"), d()->URIErrorConstructor);
    318 
    319     // Set global values.
    320     GlobalPropertyInfo staticGlobals[] = {
    321         GlobalPropertyInfo(Identifier(exec, "Math"), new (exec) MathObject(exec, MathObject::createStructure(d()->objectPrototype)), DontEnum | DontDelete),
    322         GlobalPropertyInfo(Identifier(exec, "NaN"), jsNaN(exec), DontEnum | DontDelete),
    323         GlobalPropertyInfo(Identifier(exec, "Infinity"), jsNumber(exec, Inf), DontEnum | DontDelete),
    324         GlobalPropertyInfo(Identifier(exec, "undefined"), jsUndefined(), DontEnum | DontDelete),
    325         GlobalPropertyInfo(Identifier(exec, "JSON"), new (exec) JSONObject(JSONObject::createStructure(d()->objectPrototype)), DontEnum | DontDelete)
    326     };
    327 
    328     addStaticGlobals(staticGlobals, sizeof(staticGlobals) / sizeof(GlobalPropertyInfo));
    329 
    330     // Set global functions.
    331 
    332     d()->evalFunction = new (exec) GlobalEvalFunction(exec, GlobalEvalFunction::createStructure(d()->functionPrototype), 1, exec->propertyNames().eval, globalFuncEval, this);
    333     putDirectFunctionWithoutTransition(exec, d()->evalFunction, DontEnum);
    334     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 2, Identifier(exec, "parseInt"), globalFuncParseInt), DontEnum);
    335     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "parseFloat"), globalFuncParseFloat), DontEnum);
    336     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "isNaN"), globalFuncIsNaN), DontEnum);
    337     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "isFinite"), globalFuncIsFinite), DontEnum);
    338     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "escape"), globalFuncEscape), DontEnum);
    339     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "unescape"), globalFuncUnescape), DontEnum);
    340     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "decodeURI"), globalFuncDecodeURI), DontEnum);
    341     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "decodeURIComponent"), globalFuncDecodeURIComponent), DontEnum);
    342     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "encodeURI"), globalFuncEncodeURI), DontEnum);
    343     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "encodeURIComponent"), globalFuncEncodeURIComponent), DontEnum);
    344 #ifndef NDEBUG
    345     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, d()->prototypeFunctionStructure.get(), 1, Identifier(exec, "jscprint"), globalFuncJSCPrint), DontEnum);
    346 #endif
    347 
    348     resetPrototype(prototype);
    349 }
    350 
    351 // Set prototype, and also insert the object prototype at the end of the chain.
    352 void JSGlobalObject::resetPrototype(JSValue prototype)
    353 {
    354     setPrototype(prototype);
    355 
    356     JSObject* oldLastInPrototypeChain = lastInPrototypeChain(this);
    357     JSObject* objectPrototype = d()->objectPrototype;
    358     if (oldLastInPrototypeChain != objectPrototype)
    359         oldLastInPrototypeChain->setPrototype(objectPrototype);
    360 }
    361 
    362 void JSGlobalObject::markChildren(MarkStack& markStack)
    363 {
    364     JSVariableObject::markChildren(markStack);
    365 
    366     HashSet<GlobalCodeBlock*>::const_iterator end = codeBlocks().end();
    367     for (HashSet<GlobalCodeBlock*>::const_iterator it = codeBlocks().begin(); it != end; ++it)
    368         (*it)->markAggregate(markStack);
    369 
    370     RegisterFile& registerFile = globalData()->interpreter->registerFile();
    371     if (registerFile.globalObject() == this)
    372         registerFile.markGlobals(markStack, &globalData()->heap);
    373 
    374     markIfNeeded(markStack, d()->regExpConstructor);
    375     markIfNeeded(markStack, d()->errorConstructor);
    376     markIfNeeded(markStack, d()->evalErrorConstructor);
    377     markIfNeeded(markStack, d()->rangeErrorConstructor);
    378     markIfNeeded(markStack, d()->referenceErrorConstructor);
    379     markIfNeeded(markStack, d()->syntaxErrorConstructor);
    380     markIfNeeded(markStack, d()->typeErrorConstructor);
    381     markIfNeeded(markStack, d()->URIErrorConstructor);
    382 
    383     markIfNeeded(markStack, d()->evalFunction);
    384     markIfNeeded(markStack, d()->callFunction);
    385     markIfNeeded(markStack, d()->applyFunction);
    386 
    387     markIfNeeded(markStack, d()->objectPrototype);
    388     markIfNeeded(markStack, d()->functionPrototype);
    389     markIfNeeded(markStack, d()->arrayPrototype);
    390     markIfNeeded(markStack, d()->booleanPrototype);
    391     markIfNeeded(markStack, d()->stringPrototype);
    392     markIfNeeded(markStack, d()->numberPrototype);
    393     markIfNeeded(markStack, d()->datePrototype);
    394     markIfNeeded(markStack, d()->regExpPrototype);
    395 
    396     markIfNeeded(markStack, d()->methodCallDummy);
    397 
    398     markIfNeeded(markStack, d()->errorStructure);
    399     markIfNeeded(markStack, d()->argumentsStructure);
    400     markIfNeeded(markStack, d()->arrayStructure);
    401     markIfNeeded(markStack, d()->booleanObjectStructure);
    402     markIfNeeded(markStack, d()->callbackConstructorStructure);
    403     markIfNeeded(markStack, d()->callbackFunctionStructure);
    404     markIfNeeded(markStack, d()->callbackObjectStructure);
    405     markIfNeeded(markStack, d()->dateStructure);
    406     markIfNeeded(markStack, d()->emptyObjectStructure);
    407     markIfNeeded(markStack, d()->errorStructure);
    408     markIfNeeded(markStack, d()->functionStructure);
    409     markIfNeeded(markStack, d()->numberObjectStructure);
    410     markIfNeeded(markStack, d()->prototypeFunctionStructure);
    411     markIfNeeded(markStack, d()->regExpMatchesArrayStructure);
    412     markIfNeeded(markStack, d()->regExpStructure);
    413     markIfNeeded(markStack, d()->stringObjectStructure);
    414 
    415     // No need to mark the other structures, because their prototypes are all
    416     // guaranteed to be referenced elsewhere.
    417 
    418     Register* registerArray = d()->registerArray.get();
    419     if (!registerArray)
    420         return;
    421 
    422     size_t size = d()->registerArraySize;
    423     markStack.appendValues(reinterpret_cast<JSValue*>(registerArray), size);
    424 }
    425 
    426 ExecState* JSGlobalObject::globalExec()
    427 {
    428     return CallFrame::create(d()->globalCallFrame + RegisterFile::CallFrameHeaderSize);
    429 }
    430 
    431 bool JSGlobalObject::isDynamicScope() const
    432 {
    433     return true;
    434 }
    435 
    436 void JSGlobalObject::copyGlobalsFrom(RegisterFile& registerFile)
    437 {
    438     ASSERT(!d()->registerArray);
    439     ASSERT(!d()->registerArraySize);
    440 
    441     int numGlobals = registerFile.numGlobals();
    442     if (!numGlobals) {
    443         d()->registers = 0;
    444         return;
    445     }
    446 
    447     Register* registerArray = copyRegisterArray(registerFile.lastGlobal(), numGlobals);
    448     setRegisters(registerArray + numGlobals, registerArray, numGlobals);
    449 }
    450 
    451 void JSGlobalObject::copyGlobalsTo(RegisterFile& registerFile)
    452 {
    453     JSGlobalObject* lastGlobalObject = registerFile.globalObject();
    454     if (lastGlobalObject && lastGlobalObject != this)
    455         lastGlobalObject->copyGlobalsFrom(registerFile);
    456 
    457     registerFile.setGlobalObject(this);
    458     registerFile.setNumGlobals(symbolTable().size());
    459 
    460     if (d()->registerArray) {
    461         memcpy(registerFile.start() - d()->registerArraySize, d()->registerArray.get(), d()->registerArraySize * sizeof(Register));
    462         setRegisters(registerFile.start(), 0, 0);
    463     }
    464 }
    465 
    466 void* JSGlobalObject::operator new(size_t size, JSGlobalData* globalData)
    467 {
    468     return globalData->heap.allocate(size);
    469 }
    470 
    471 void JSGlobalObject::destroyJSGlobalObjectData(void* jsGlobalObjectData)
    472 {
    473     delete static_cast<JSGlobalObjectData*>(jsGlobalObjectData);
    474 }
    475 
    476 } // namespace JSC
    477