runtime/JSGlobalObject.cpp

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