Home | History | Annotate | Download | only in API 
      1 /*
      2  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      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  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "APIShims.h"
     28 #include "APICast.h"
     29 #include "Error.h"
     30 #include "ExceptionHelpers.h"
     31 #include "JSCallbackFunction.h"
     32 #include "JSClassRef.h"
     33 #include "JSFunction.h"
     34 #include "JSGlobalObject.h"
     35 #include "JSLock.h"
     36 #include "JSObjectRef.h"
     37 #include "JSString.h"
     38 #include "JSStringRef.h"
     39 #include "OpaqueJSString.h"
     40 #include "PropertyNameArray.h"
     41 #include <wtf/Vector.h>
     42 
     43 namespace JSC {
     44 
     45 template <class Base>
     46 inline JSCallbackObject<Base>* JSCallbackObject<Base>::asCallbackObject(JSValue value)
     47 {
     48     ASSERT(asObject(value)->inherits(&s_info));
     49     return static_cast<JSCallbackObject*>(asObject(value));
     50 }
     51 
     52 template <class Base>
     53 JSCallbackObject<Base>::JSCallbackObject(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, JSClassRef jsClass, void* data)
     54     : Base(globalObject, structure)
     55     , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(data, jsClass)))
     56 {
     57     ASSERT(Base::inherits(&s_info));
     58     init(exec);
     59 }
     60 
     61 // Global object constructor.
     62 // FIXME: Move this into a separate JSGlobalCallbackObject class derived from this one.
     63 template <class Base>
     64 JSCallbackObject<Base>::JSCallbackObject(JSGlobalData& globalData, JSClassRef jsClass, Structure* structure)
     65     : Base(globalData, structure)
     66     , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(0, jsClass)))
     67 {
     68     ASSERT(Base::inherits(&s_info));
     69     ASSERT(Base::isGlobalObject());
     70     init(static_cast<JSGlobalObject*>(this)->globalExec());
     71 }
     72 
     73 template <class Base>
     74 void JSCallbackObject<Base>::init(ExecState* exec)
     75 {
     76     ASSERT(exec);
     77 
     78     Vector<JSObjectInitializeCallback, 16> initRoutines;
     79     JSClassRef jsClass = classRef();
     80     do {
     81         if (JSObjectInitializeCallback initialize = jsClass->initialize)
     82             initRoutines.append(initialize);
     83     } while ((jsClass = jsClass->parentClass));
     84 
     85     // initialize from base to derived
     86     for (int i = static_cast<int>(initRoutines.size()) - 1; i >= 0; i--) {
     87         APICallbackShim callbackShim(exec);
     88         JSObjectInitializeCallback initialize = initRoutines[i];
     89         initialize(toRef(exec), toRef(this));
     90     }
     91 
     92     bool needsFinalizer = false;
     93     for (JSClassRef jsClassPtr = classRef(); jsClassPtr && !needsFinalizer; jsClassPtr = jsClassPtr->parentClass)
     94         needsFinalizer = jsClassPtr->finalize;
     95     if (needsFinalizer) {
     96         HandleSlot slot = exec->globalData().allocateGlobalHandle();
     97         HandleHeap::heapFor(slot)->makeWeak(slot, m_callbackObjectData.get(), classRef());
     98         HandleHeap::heapFor(slot)->writeBarrier(slot, this);
     99         *slot = this;
    100     }
    101 }
    102 
    103 template <class Base>
    104 UString JSCallbackObject<Base>::className() const
    105 {
    106     UString thisClassName = classRef()->className();
    107     if (!thisClassName.isEmpty())
    108         return thisClassName;
    109 
    110     return Base::className();
    111 }
    112 
    113 template <class Base>
    114 bool JSCallbackObject<Base>::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
    115 {
    116     JSContextRef ctx = toRef(exec);
    117     JSObjectRef thisRef = toRef(this);
    118     RefPtr<OpaqueJSString> propertyNameRef;
    119 
    120     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    121         // optional optimization to bypass getProperty in cases when we only need to know if the property exists
    122         if (JSObjectHasPropertyCallback hasProperty = jsClass->hasProperty) {
    123             if (!propertyNameRef)
    124                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    125             APICallbackShim callbackShim(exec);
    126             if (hasProperty(ctx, thisRef, propertyNameRef.get())) {
    127                 slot.setCustom(this, callbackGetter);
    128                 return true;
    129             }
    130         } else if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
    131             if (!propertyNameRef)
    132                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    133             JSValueRef exception = 0;
    134             JSValueRef value;
    135             {
    136                 APICallbackShim callbackShim(exec);
    137                 value = getProperty(ctx, thisRef, propertyNameRef.get(), &exception);
    138             }
    139             if (exception) {
    140                 throwError(exec, toJS(exec, exception));
    141                 slot.setValue(jsUndefined());
    142                 return true;
    143             }
    144             if (value) {
    145                 slot.setValue(toJS(exec, value));
    146                 return true;
    147             }
    148         }
    149 
    150         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
    151             if (staticValues->contains(propertyName.impl())) {
    152                 slot.setCustom(this, staticValueGetter);
    153                 return true;
    154             }
    155         }
    156 
    157         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
    158             if (staticFunctions->contains(propertyName.impl())) {
    159                 slot.setCustom(this, staticFunctionGetter);
    160                 return true;
    161             }
    162         }
    163     }
    164 
    165     return Base::getOwnPropertySlot(exec, propertyName, slot);
    166 }
    167 
    168 template <class Base>
    169 bool JSCallbackObject<Base>::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
    170 {
    171     PropertySlot slot;
    172     if (getOwnPropertySlot(exec, propertyName, slot)) {
    173         // Ideally we should return an access descriptor, but returning a value descriptor is better than nothing.
    174         JSValue value = slot.getValue(exec, propertyName);
    175         if (!exec->hadException())
    176             descriptor.setValue(value);
    177         // We don't know whether the property is configurable, but assume it is.
    178         descriptor.setConfigurable(true);
    179         // We don't know whether the property is enumerable (we could call getOwnPropertyNames() to find out), but assume it isn't.
    180         descriptor.setEnumerable(false);
    181         return true;
    182     }
    183 
    184     return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
    185 }
    186 
    187 template <class Base>
    188 void JSCallbackObject<Base>::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
    189 {
    190     JSContextRef ctx = toRef(exec);
    191     JSObjectRef thisRef = toRef(this);
    192     RefPtr<OpaqueJSString> propertyNameRef;
    193     JSValueRef valueRef = toRef(exec, value);
    194 
    195     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    196         if (JSObjectSetPropertyCallback setProperty = jsClass->setProperty) {
    197             if (!propertyNameRef)
    198                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    199             JSValueRef exception = 0;
    200             bool result;
    201             {
    202                 APICallbackShim callbackShim(exec);
    203                 result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
    204             }
    205             if (exception)
    206                 throwError(exec, toJS(exec, exception));
    207             if (result || exception)
    208                 return;
    209         }
    210 
    211         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
    212             if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
    213                 if (entry->attributes & kJSPropertyAttributeReadOnly)
    214                     return;
    215                 if (JSObjectSetPropertyCallback setProperty = entry->setProperty) {
    216                     if (!propertyNameRef)
    217                         propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    218                     JSValueRef exception = 0;
    219                     bool result;
    220                     {
    221                         APICallbackShim callbackShim(exec);
    222                         result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
    223                     }
    224                     if (exception)
    225                         throwError(exec, toJS(exec, exception));
    226                     if (result || exception)
    227                         return;
    228                 } else
    229                     throwError(exec, createReferenceError(exec, "Attempt to set a property that is not settable."));
    230             }
    231         }
    232 
    233         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
    234             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
    235                 if (entry->attributes & kJSPropertyAttributeReadOnly)
    236                     return;
    237                 JSCallbackObject<Base>::putDirect(exec->globalData(), propertyName, value); // put as override property
    238                 return;
    239             }
    240         }
    241     }
    242 
    243     return Base::put(exec, propertyName, value, slot);
    244 }
    245 
    246 template <class Base>
    247 bool JSCallbackObject<Base>::deleteProperty(ExecState* exec, const Identifier& propertyName)
    248 {
    249     JSContextRef ctx = toRef(exec);
    250     JSObjectRef thisRef = toRef(this);
    251     RefPtr<OpaqueJSString> propertyNameRef;
    252 
    253     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    254         if (JSObjectDeletePropertyCallback deleteProperty = jsClass->deleteProperty) {
    255             if (!propertyNameRef)
    256                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    257             JSValueRef exception = 0;
    258             bool result;
    259             {
    260                 APICallbackShim callbackShim(exec);
    261                 result = deleteProperty(ctx, thisRef, propertyNameRef.get(), &exception);
    262             }
    263             if (exception)
    264                 throwError(exec, toJS(exec, exception));
    265             if (result || exception)
    266                 return true;
    267         }
    268 
    269         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
    270             if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
    271                 if (entry->attributes & kJSPropertyAttributeDontDelete)
    272                     return false;
    273                 return true;
    274             }
    275         }
    276 
    277         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
    278             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
    279                 if (entry->attributes & kJSPropertyAttributeDontDelete)
    280                     return false;
    281                 return true;
    282             }
    283         }
    284     }
    285 
    286     return Base::deleteProperty(exec, propertyName);
    287 }
    288 
    289 template <class Base>
    290 bool JSCallbackObject<Base>::deleteProperty(ExecState* exec, unsigned propertyName)
    291 {
    292     return deleteProperty(exec, Identifier::from(exec, propertyName));
    293 }
    294 
    295 template <class Base>
    296 ConstructType JSCallbackObject<Base>::getConstructData(ConstructData& constructData)
    297 {
    298     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    299         if (jsClass->callAsConstructor) {
    300             constructData.native.function = construct;
    301             return ConstructTypeHost;
    302         }
    303     }
    304     return ConstructTypeNone;
    305 }
    306 
    307 template <class Base>
    308 EncodedJSValue JSCallbackObject<Base>::construct(ExecState* exec)
    309 {
    310     JSObject* constructor = exec->callee();
    311     JSContextRef execRef = toRef(exec);
    312     JSObjectRef constructorRef = toRef(constructor);
    313 
    314     for (JSClassRef jsClass = static_cast<JSCallbackObject<Base>*>(constructor)->classRef(); jsClass; jsClass = jsClass->parentClass) {
    315         if (JSObjectCallAsConstructorCallback callAsConstructor = jsClass->callAsConstructor) {
    316             int argumentCount = static_cast<int>(exec->argumentCount());
    317             Vector<JSValueRef, 16> arguments(argumentCount);
    318             for (int i = 0; i < argumentCount; i++)
    319                 arguments[i] = toRef(exec, exec->argument(i));
    320             JSValueRef exception = 0;
    321             JSObject* result;
    322             {
    323                 APICallbackShim callbackShim(exec);
    324                 result = toJS(callAsConstructor(execRef, constructorRef, argumentCount, arguments.data(), &exception));
    325             }
    326             if (exception)
    327                 throwError(exec, toJS(exec, exception));
    328             return JSValue::encode(result);
    329         }
    330     }
    331 
    332     ASSERT_NOT_REACHED(); // getConstructData should prevent us from reaching here
    333     return JSValue::encode(JSValue());
    334 }
    335 
    336 template <class Base>
    337 bool JSCallbackObject<Base>::hasInstance(ExecState* exec, JSValue value, JSValue)
    338 {
    339     JSContextRef execRef = toRef(exec);
    340     JSObjectRef thisRef = toRef(this);
    341 
    342     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    343         if (JSObjectHasInstanceCallback hasInstance = jsClass->hasInstance) {
    344             JSValueRef valueRef = toRef(exec, value);
    345             JSValueRef exception = 0;
    346             bool result;
    347             {
    348                 APICallbackShim callbackShim(exec);
    349                 result = hasInstance(execRef, thisRef, valueRef, &exception);
    350             }
    351             if (exception)
    352                 throwError(exec, toJS(exec, exception));
    353             return result;
    354         }
    355     }
    356     return false;
    357 }
    358 
    359 template <class Base>
    360 CallType JSCallbackObject<Base>::getCallData(CallData& callData)
    361 {
    362     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    363         if (jsClass->callAsFunction) {
    364             callData.native.function = call;
    365             return CallTypeHost;
    366         }
    367     }
    368     return CallTypeNone;
    369 }
    370 
    371 template <class Base>
    372 EncodedJSValue JSCallbackObject<Base>::call(ExecState* exec)
    373 {
    374     JSContextRef execRef = toRef(exec);
    375     JSObjectRef functionRef = toRef(exec->callee());
    376     JSObjectRef thisObjRef = toRef(exec->hostThisValue().toThisObject(exec));
    377 
    378     for (JSClassRef jsClass = static_cast<JSCallbackObject<Base>*>(toJS(functionRef))->classRef(); jsClass; jsClass = jsClass->parentClass) {
    379         if (JSObjectCallAsFunctionCallback callAsFunction = jsClass->callAsFunction) {
    380             int argumentCount = static_cast<int>(exec->argumentCount());
    381             Vector<JSValueRef, 16> arguments(argumentCount);
    382             for (int i = 0; i < argumentCount; i++)
    383                 arguments[i] = toRef(exec, exec->argument(i));
    384             JSValueRef exception = 0;
    385             JSValue result;
    386             {
    387                 APICallbackShim callbackShim(exec);
    388                 result = toJS(exec, callAsFunction(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception));
    389             }
    390             if (exception)
    391                 throwError(exec, toJS(exec, exception));
    392             return JSValue::encode(result);
    393         }
    394     }
    395 
    396     ASSERT_NOT_REACHED(); // getCallData should prevent us from reaching here
    397     return JSValue::encode(JSValue());
    398 }
    399 
    400 template <class Base>
    401 void JSCallbackObject<Base>::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
    402 {
    403     JSContextRef execRef = toRef(exec);
    404     JSObjectRef thisRef = toRef(this);
    405 
    406     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass) {
    407         if (JSObjectGetPropertyNamesCallback getPropertyNames = jsClass->getPropertyNames) {
    408             APICallbackShim callbackShim(exec);
    409             getPropertyNames(execRef, thisRef, toRef(&propertyNames));
    410         }
    411 
    412         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
    413             typedef OpaqueJSClassStaticValuesTable::const_iterator iterator;
    414             iterator end = staticValues->end();
    415             for (iterator it = staticValues->begin(); it != end; ++it) {
    416                 StringImpl* name = it->first.get();
    417                 StaticValueEntry* entry = it->second;
    418                 if (entry->getProperty && (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties)))
    419                     propertyNames.add(Identifier(exec, name));
    420             }
    421         }
    422 
    423         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
    424             typedef OpaqueJSClassStaticFunctionsTable::const_iterator iterator;
    425             iterator end = staticFunctions->end();
    426             for (iterator it = staticFunctions->begin(); it != end; ++it) {
    427                 StringImpl* name = it->first.get();
    428                 StaticFunctionEntry* entry = it->second;
    429                 if (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties))
    430                     propertyNames.add(Identifier(exec, name));
    431             }
    432         }
    433     }
    434 
    435     Base::getOwnPropertyNames(exec, propertyNames, mode);
    436 }
    437 
    438 template <class Base>
    439 double JSCallbackObject<Base>::toNumber(ExecState* exec) const
    440 {
    441     // We need this check to guard against the case where this object is rhs of
    442     // a binary expression where lhs threw an exception in its conversion to
    443     // primitive
    444     if (exec->hadException())
    445         return NaN;
    446     JSContextRef ctx = toRef(exec);
    447     JSObjectRef thisRef = toRef(this);
    448 
    449     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
    450         if (JSObjectConvertToTypeCallback convertToType = jsClass->convertToType) {
    451             JSValueRef exception = 0;
    452             JSValueRef value;
    453             {
    454                 APICallbackShim callbackShim(exec);
    455                 value = convertToType(ctx, thisRef, kJSTypeNumber, &exception);
    456             }
    457             if (exception) {
    458                 throwError(exec, toJS(exec, exception));
    459                 return 0;
    460             }
    461 
    462             double dValue;
    463             if (value)
    464                 return toJS(exec, value).getNumber(dValue) ? dValue : NaN;
    465         }
    466 
    467     return Base::toNumber(exec);
    468 }
    469 
    470 template <class Base>
    471 UString JSCallbackObject<Base>::toString(ExecState* exec) const
    472 {
    473     JSContextRef ctx = toRef(exec);
    474     JSObjectRef thisRef = toRef(this);
    475 
    476     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
    477         if (JSObjectConvertToTypeCallback convertToType = jsClass->convertToType) {
    478             JSValueRef exception = 0;
    479             JSValueRef value;
    480             {
    481                 APICallbackShim callbackShim(exec);
    482                 value = convertToType(ctx, thisRef, kJSTypeString, &exception);
    483             }
    484             if (exception) {
    485                 throwError(exec, toJS(exec, exception));
    486                 return "";
    487             }
    488             if (value)
    489                 return toJS(exec, value).getString(exec);
    490         }
    491 
    492     return Base::toString(exec);
    493 }
    494 
    495 template <class Base>
    496 void JSCallbackObject<Base>::setPrivate(void* data)
    497 {
    498     m_callbackObjectData->privateData = data;
    499 }
    500 
    501 template <class Base>
    502 void* JSCallbackObject<Base>::getPrivate()
    503 {
    504     return m_callbackObjectData->privateData;
    505 }
    506 
    507 template <class Base>
    508 bool JSCallbackObject<Base>::inherits(JSClassRef c) const
    509 {
    510     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
    511         if (jsClass == c)
    512             return true;
    513 
    514     return false;
    515 }
    516 
    517 template <class Base>
    518 JSValue JSCallbackObject<Base>::staticValueGetter(ExecState* exec, JSValue slotBase, const Identifier& propertyName)
    519 {
    520     JSCallbackObject* thisObj = asCallbackObject(slotBase);
    521 
    522     JSObjectRef thisRef = toRef(thisObj);
    523     RefPtr<OpaqueJSString> propertyNameRef;
    524 
    525     for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass)
    526         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec))
    527             if (StaticValueEntry* entry = staticValues->get(propertyName.impl()))
    528                 if (JSObjectGetPropertyCallback getProperty = entry->getProperty) {
    529                     if (!propertyNameRef)
    530                         propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    531                     JSValueRef exception = 0;
    532                     JSValueRef value;
    533                     {
    534                         APICallbackShim callbackShim(exec);
    535                         value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
    536                     }
    537                     if (exception) {
    538                         throwError(exec, toJS(exec, exception));
    539                         return jsUndefined();
    540                     }
    541                     if (value)
    542                         return toJS(exec, value);
    543                 }
    544 
    545     return throwError(exec, createReferenceError(exec, "Static value property defined with NULL getProperty callback."));
    546 }
    547 
    548 template <class Base>
    549 JSValue JSCallbackObject<Base>::staticFunctionGetter(ExecState* exec, JSValue slotBase, const Identifier& propertyName)
    550 {
    551     JSCallbackObject* thisObj = asCallbackObject(slotBase);
    552 
    553     // Check for cached or override property.
    554     PropertySlot slot2(thisObj);
    555     if (thisObj->Base::getOwnPropertySlot(exec, propertyName, slot2))
    556         return slot2.getValue(exec, propertyName);
    557 
    558     for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass) {
    559         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
    560             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
    561                 if (JSObjectCallAsFunctionCallback callAsFunction = entry->callAsFunction) {
    562 
    563                     JSObject* o = new (exec) JSCallbackFunction(exec, asGlobalObject(thisObj->getAnonymousValue(0)), callAsFunction, propertyName);
    564                     thisObj->putDirect(exec->globalData(), propertyName, o, entry->attributes);
    565                     return o;
    566                 }
    567             }
    568         }
    569     }
    570 
    571     return throwError(exec, createReferenceError(exec, "Static function property defined with NULL callAsFunction callback."));
    572 }
    573 
    574 template <class Base>
    575 JSValue JSCallbackObject<Base>::callbackGetter(ExecState* exec, JSValue slotBase, const Identifier& propertyName)
    576 {
    577     JSCallbackObject* thisObj = asCallbackObject(slotBase);
    578 
    579     JSObjectRef thisRef = toRef(thisObj);
    580     RefPtr<OpaqueJSString> propertyNameRef;
    581 
    582     for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass)
    583         if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
    584             if (!propertyNameRef)
    585                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
    586             JSValueRef exception = 0;
    587             JSValueRef value;
    588             {
    589                 APICallbackShim callbackShim(exec);
    590                 value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
    591             }
    592             if (exception) {
    593                 throwError(exec, toJS(exec, exception));
    594                 return jsUndefined();
    595             }
    596             if (value)
    597                 return toJS(exec, value);
    598         }
    599 
    600     return throwError(exec, createReferenceError(exec, "hasProperty callback returned true for a property that doesn't exist."));
    601 }
    602 
    603 } // namespace JSC
    604