API/JSCallbackObjectFunctions.h

   1 /*
   2  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2007 Eric Seidel <eric@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 Parent>
  46 inline JSCallbackObject<Parent>* JSCallbackObject<Parent>::asCallbackObject(JSValue value)
  47 {
  48     ASSERT(asObject(value)->inherits(&s_info));
  49     return jsCast<JSCallbackObject*>(asObject(value));
  50 }
  51
  52 template <class Parent>
  53 JSCallbackObject<Parent>::JSCallbackObject(ExecState* exec, Structure* structure, JSClassRef jsClass, void* data)
  54     : Parent(exec->globalData(), structure)
  55     , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(data, jsClass)))
  56 {
  57 }
  58
  59 // Global object constructor.
  60 // FIXME: Move this into a separate JSGlobalCallbackObject class derived from this one.
  61 template <class Parent>
  62 JSCallbackObject<Parent>::JSCallbackObject(JSGlobalData& globalData, JSClassRef jsClass, Structure* structure)
  63     : Parent(globalData, structure)
  64     , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(0, jsClass)))
  65 {
  66 }
  67
  68 template <class Parent>
  69 void JSCallbackObject<Parent>::finishCreation(ExecState* exec)
  70 {
  71     Base::finishCreation(exec->globalData());
  72     ASSERT(Parent::inherits(&s_info));
  73     init(exec);
  74 }
  75
  76 // This is just for Global object, so we can assume that Base::finishCreation is JSGlobalObject::finishCreation.
  77 template <class Parent>
  78 void JSCallbackObject<Parent>::finishCreation(JSGlobalData& globalData)
  79 {
  80     ASSERT(Parent::inherits(&s_info));
  81     ASSERT(Parent::isGlobalObject());
  82     Base::finishCreation(globalData);
  83     init(jsCast<JSGlobalObject*>(this)->globalExec());
  84 }
  85
  86 template <class Parent>
  87 void JSCallbackObject<Parent>::init(ExecState* exec)
  88 {
  89     ASSERT(exec);
  90
  91     Vector<JSObjectInitializeCallback, 16> initRoutines;
  92     JSClassRef jsClass = classRef();
  93     do {
  94         if (JSObjectInitializeCallback initialize = jsClass->initialize)
  95             initRoutines.append(initialize);
  96     } while ((jsClass = jsClass->parentClass));
  97
  98     // initialize from base to derived
  99     for (int i = static_cast<int>(initRoutines.size()) - 1; i >= 0; i--) {
 100         APICallbackShim callbackShim(exec);
 101         JSObjectInitializeCallback initialize = initRoutines[i];
 102         initialize(toRef(exec), toRef(this));
 103     }
 104
 105     for (JSClassRef jsClassPtr = classRef(); jsClassPtr; jsClassPtr = jsClassPtr->parentClass) {
 106         if (jsClassPtr->finalize) {
 107             WeakSet::allocate(this, m_callbackObjectData.get(), classRef());
 108             break;
 109         }
 110     }
 111 }
 112
 113 template <class Parent>
 114 UString JSCallbackObject<Parent>::className(const JSObject* object)
 115 {
 116     const JSCallbackObject* thisObject = jsCast<const JSCallbackObject*>(object);
 117     UString thisClassName = thisObject->classRef()->className();
 118     if (!thisClassName.isEmpty())
 119         return thisClassName;
 120
 121     return Parent::className(object);
 122 }
 123
 124 template <class Parent>
 125 bool JSCallbackObject<Parent>::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
 126 {
 127     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 128     JSContextRef ctx = toRef(exec);
 129     JSObjectRef thisRef = toRef(thisObject);
 130     RefPtr<OpaqueJSString> propertyNameRef;
 131
 132     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 133         // optional optimization to bypass getProperty in cases when we only need to know if the property exists
 134         if (JSObjectHasPropertyCallback hasProperty = jsClass->hasProperty) {
 135             if (!propertyNameRef)
 136                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 137             APICallbackShim callbackShim(exec);
 138             if (hasProperty(ctx, thisRef, propertyNameRef.get())) {
 139                 slot.setCustom(thisObject, callbackGetter);
 140                 return true;
 141             }
 142         } else if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
 143             if (!propertyNameRef)
 144                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 145             JSValueRef exception = 0;
 146             JSValueRef value;
 147             {
 148                 APICallbackShim callbackShim(exec);
 149                 value = getProperty(ctx, thisRef, propertyNameRef.get(), &exception);
 150             }
 151             if (exception) {
 152                 throwError(exec, toJS(exec, exception));
 153                 slot.setValue(jsUndefined());
 154                 return true;
 155             }
 156             if (value) {
 157                 slot.setValue(toJS(exec, value));
 158                 return true;
 159             }
 160         }
 161
 162         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
 163             if (staticValues->contains(propertyName.impl())) {
 164                 JSValue value = thisObject->getStaticValue(exec, propertyName);
 165                 if (value) {
 166                     slot.setValue(value);
 167                     return true;
 168                 }
 169             }
 170         }
 171
 172         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
 173             if (staticFunctions->contains(propertyName.impl())) {
 174                 slot.setCustom(thisObject, staticFunctionGetter);
 175                 return true;
 176             }
 177         }
 178     }
 179
 180     return Parent::getOwnPropertySlot(thisObject, exec, propertyName, slot);
 181 }
 182
 183 template <class Parent>
 184 JSValue JSCallbackObject<Parent>::defaultValue(const JSObject* object, ExecState* exec, PreferredPrimitiveType hint)
 185 {
 186     const JSCallbackObject* thisObject = jsCast<const JSCallbackObject*>(object);
 187     JSContextRef ctx = toRef(exec);
 188     JSObjectRef thisRef = toRef(thisObject);
 189     ::JSType jsHint = hint == PreferString ? kJSTypeString : kJSTypeNumber;
 190
 191     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 192         if (JSObjectConvertToTypeCallback convertToType = jsClass->convertToType) {
 193             JSValueRef exception = 0;
 194             JSValueRef result = convertToType(ctx, thisRef, jsHint, &exception);
 195             if (exception) {
 196                 throwError(exec, toJS(exec, exception));
 197                 return jsUndefined();
 198             }
 199             if (result)
 200                 return toJS(exec, result);
 201         }
 202     }
 203
 204     return Parent::defaultValue(object, exec, hint);
 205 }
 206
 207 template <class Parent>
 208 bool JSCallbackObject<Parent>::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 209 {
 210     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
 211     PropertySlot slot;
 212     if (thisObject->methodTable()->getOwnPropertySlot(thisObject, exec, propertyName, slot)) {
 213         // Ideally we should return an access descriptor, but returning a value descriptor is better than nothing.
 214         JSValue value = slot.getValue(exec, propertyName);
 215         if (!exec->hadException())
 216             descriptor.setValue(value);
 217         // We don't know whether the property is configurable, but assume it is.
 218         descriptor.setConfigurable(true);
 219         // We don't know whether the property is enumerable (we could call getOwnPropertyNames() to find out), but assume it isn't.
 220         descriptor.setEnumerable(false);
 221         return true;
 222     }
 223
 224     return Parent::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
 225 }
 226
 227 template <class Parent>
 228 void JSCallbackObject<Parent>::put(JSCell* cell, ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
 229 {
 230     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 231     JSContextRef ctx = toRef(exec);
 232     JSObjectRef thisRef = toRef(thisObject);
 233     RefPtr<OpaqueJSString> propertyNameRef;
 234     JSValueRef valueRef = toRef(exec, value);
 235
 236     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 237         if (JSObjectSetPropertyCallback setProperty = jsClass->setProperty) {
 238             if (!propertyNameRef)
 239                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 240             JSValueRef exception = 0;
 241             bool result;
 242             {
 243                 APICallbackShim callbackShim(exec);
 244                 result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
 245             }
 246             if (exception)
 247                 throwError(exec, toJS(exec, exception));
 248             if (result || exception)
 249                 return;
 250         }
 251
 252         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
 253             if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
 254                 if (entry->attributes & kJSPropertyAttributeReadOnly)
 255                     return;
 256                 if (JSObjectSetPropertyCallback setProperty = entry->setProperty) {
 257                     if (!propertyNameRef)
 258                         propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 259                     JSValueRef exception = 0;
 260                     bool result;
 261                     {
 262                         APICallbackShim callbackShim(exec);
 263                         result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
 264                     }
 265                     if (exception)
 266                         throwError(exec, toJS(exec, exception));
 267                     if (result || exception)
 268                         return;
 269                 }
 270             }
 271         }
 272
 273         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
 274             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
 275                 if (entry->attributes & kJSPropertyAttributeReadOnly)
 276                     return;
 277                 thisObject->JSCallbackObject<Parent>::putDirect(exec->globalData(), propertyName, value); // put as override property
 278                 return;
 279             }
 280         }
 281     }
 282
 283     return Parent::put(thisObject, exec, propertyName, value, slot);
 284 }
 285
 286 template <class Parent>
 287 bool JSCallbackObject<Parent>::deleteProperty(JSCell* cell, ExecState* exec, const Identifier& propertyName)
 288 {
 289     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 290     JSContextRef ctx = toRef(exec);
 291     JSObjectRef thisRef = toRef(thisObject);
 292     RefPtr<OpaqueJSString> propertyNameRef;
 293
 294     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 295         if (JSObjectDeletePropertyCallback deleteProperty = jsClass->deleteProperty) {
 296             if (!propertyNameRef)
 297                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 298             JSValueRef exception = 0;
 299             bool result;
 300             {
 301                 APICallbackShim callbackShim(exec);
 302                 result = deleteProperty(ctx, thisRef, propertyNameRef.get(), &exception);
 303             }
 304             if (exception)
 305                 throwError(exec, toJS(exec, exception));
 306             if (result || exception)
 307                 return true;
 308         }
 309
 310         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
 311             if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
 312                 if (entry->attributes & kJSPropertyAttributeDontDelete)
 313                     return false;
 314                 return true;
 315             }
 316         }
 317
 318         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
 319             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
 320                 if (entry->attributes & kJSPropertyAttributeDontDelete)
 321                     return false;
 322                 return true;
 323             }
 324         }
 325     }
 326
 327     return Parent::deleteProperty(thisObject, exec, propertyName);
 328 }
 329
 330 template <class Parent>
 331 bool JSCallbackObject<Parent>::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned propertyName)
 332 {
 333     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 334     return thisObject->methodTable()->deleteProperty(thisObject, exec, Identifier::from(exec, propertyName));
 335 }
 336
 337 template <class Parent>
 338 ConstructType JSCallbackObject<Parent>::getConstructData(JSCell* cell, ConstructData& constructData)
 339 {
 340     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 341     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 342         if (jsClass->callAsConstructor) {
 343             constructData.native.function = construct;
 344             return ConstructTypeHost;
 345         }
 346     }
 347     return ConstructTypeNone;
 348 }
 349
 350 template <class Parent>
 351 EncodedJSValue JSCallbackObject<Parent>::construct(ExecState* exec)
 352 {
 353     JSObject* constructor = exec->callee();
 354     JSContextRef execRef = toRef(exec);
 355     JSObjectRef constructorRef = toRef(constructor);
 356
 357     for (JSClassRef jsClass = jsCast<JSCallbackObject<Parent>*>(constructor)->classRef(); jsClass; jsClass = jsClass->parentClass) {
 358         if (JSObjectCallAsConstructorCallback callAsConstructor = jsClass->callAsConstructor) {
 359             int argumentCount = static_cast<int>(exec->argumentCount());
 360             Vector<JSValueRef, 16> arguments(argumentCount);
 361             for (int i = 0; i < argumentCount; i++)
 362                 arguments[i] = toRef(exec, exec->argument(i));
 363             JSValueRef exception = 0;
 364             JSObject* result;
 365             {
 366                 APICallbackShim callbackShim(exec);
 367                 result = toJS(callAsConstructor(execRef, constructorRef, argumentCount, arguments.data(), &exception));
 368             }
 369             if (exception)
 370                 throwError(exec, toJS(exec, exception));
 371             return JSValue::encode(result);
 372         }
 373     }
 374
 375     ASSERT_NOT_REACHED(); // getConstructData should prevent us from reaching here
 376     return JSValue::encode(JSValue());
 377 }
 378
 379 template <class Parent>
 380 bool JSCallbackObject<Parent>::hasInstance(JSObject* object, ExecState* exec, JSValue value, JSValue)
 381 {
 382     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
 383     JSContextRef execRef = toRef(exec);
 384     JSObjectRef thisRef = toRef(thisObject);
 385
 386     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 387         if (JSObjectHasInstanceCallback hasInstance = jsClass->hasInstance) {
 388             JSValueRef valueRef = toRef(exec, value);
 389             JSValueRef exception = 0;
 390             bool result;
 391             {
 392                 APICallbackShim callbackShim(exec);
 393                 result = hasInstance(execRef, thisRef, valueRef, &exception);
 394             }
 395             if (exception)
 396                 throwError(exec, toJS(exec, exception));
 397             return result;
 398         }
 399     }
 400     return false;
 401 }
 402
 403 template <class Parent>
 404 CallType JSCallbackObject<Parent>::getCallData(JSCell* cell, CallData& callData)
 405 {
 406     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
 407     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 408         if (jsClass->callAsFunction) {
 409             callData.native.function = call;
 410             return CallTypeHost;
 411         }
 412     }
 413     return CallTypeNone;
 414 }
 415
 416 template <class Parent>
 417 EncodedJSValue JSCallbackObject<Parent>::call(ExecState* exec)
 418 {
 419     JSContextRef execRef = toRef(exec);
 420     JSObjectRef functionRef = toRef(exec->callee());
 421     JSObjectRef thisObjRef = toRef(exec->hostThisValue().toThisObject(exec));
 422
 423     for (JSClassRef jsClass = jsCast<JSCallbackObject<Parent>*>(toJS(functionRef))->classRef(); jsClass; jsClass = jsClass->parentClass) {
 424         if (JSObjectCallAsFunctionCallback callAsFunction = jsClass->callAsFunction) {
 425             int argumentCount = static_cast<int>(exec->argumentCount());
 426             Vector<JSValueRef, 16> arguments(argumentCount);
 427             for (int i = 0; i < argumentCount; i++)
 428                 arguments[i] = toRef(exec, exec->argument(i));
 429             JSValueRef exception = 0;
 430             JSValue result;
 431             {
 432                 APICallbackShim callbackShim(exec);
 433                 result = toJS(exec, callAsFunction(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception));
 434             }
 435             if (exception)
 436                 throwError(exec, toJS(exec, exception));
 437             return JSValue::encode(result);
 438         }
 439     }
 440
 441     ASSERT_NOT_REACHED(); // getCallData should prevent us from reaching here
 442     return JSValue::encode(JSValue());
 443 }
 444
 445 template <class Parent>
 446 void JSCallbackObject<Parent>::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 447 {
 448     JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
 449     JSContextRef execRef = toRef(exec);
 450     JSObjectRef thisRef = toRef(thisObject);
 451
 452     for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
 453         if (JSObjectGetPropertyNamesCallback getPropertyNames = jsClass->getPropertyNames) {
 454             APICallbackShim callbackShim(exec);
 455             getPropertyNames(execRef, thisRef, toRef(&propertyNames));
 456         }
 457
 458         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
 459             typedef OpaqueJSClassStaticValuesTable::const_iterator iterator;
 460             iterator end = staticValues->end();
 461             for (iterator it = staticValues->begin(); it != end; ++it) {
 462                 StringImpl* name = it->first.get();
 463                 StaticValueEntry* entry = it->second.get();
 464                 if (entry->getProperty && (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties)))
 465                     propertyNames.add(Identifier(exec, name));
 466             }
 467         }
 468
 469         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
 470             typedef OpaqueJSClassStaticFunctionsTable::const_iterator iterator;
 471             iterator end = staticFunctions->end();
 472             for (iterator it = staticFunctions->begin(); it != end; ++it) {
 473                 StringImpl* name = it->first.get();
 474                 StaticFunctionEntry* entry = it->second.get();
 475                 if (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties))
 476                     propertyNames.add(Identifier(exec, name));
 477             }
 478         }
 479     }
 480
 481     Parent::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
 482 }
 483
 484 template <class Parent>
 485 void JSCallbackObject<Parent>::setPrivate(void* data)
 486 {
 487     m_callbackObjectData->privateData = data;
 488 }
 489
 490 template <class Parent>
 491 void* JSCallbackObject<Parent>::getPrivate()
 492 {
 493     return m_callbackObjectData->privateData;
 494 }
 495
 496 template <class Parent>
 497 bool JSCallbackObject<Parent>::inherits(JSClassRef c) const
 498 {
 499     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
 500         if (jsClass == c)
 501             return true;
 502
 503     return false;
 504 }
 505
 506 template <class Parent>
 507 JSValue JSCallbackObject<Parent>::getStaticValue(ExecState* exec, const Identifier& propertyName)
 508 {
 509     JSObjectRef thisRef = toRef(this);
 510     RefPtr<OpaqueJSString> propertyNameRef;
 511
 512     for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
 513         if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec))
 514             if (StaticValueEntry* entry = staticValues->get(propertyName.impl()))
 515                 if (JSObjectGetPropertyCallback getProperty = entry->getProperty) {
 516                     if (!propertyNameRef)
 517                         propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 518                     JSValueRef exception = 0;
 519                     JSValueRef value;
 520                     {
 521                         APICallbackShim callbackShim(exec);
 522                         value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
 523                     }
 524                     if (exception) {
 525                         throwError(exec, toJS(exec, exception));
 526                         return jsUndefined();
 527                     }
 528                     if (value)
 529                         return toJS(exec, value);
 530                 }
 531
 532     return JSValue();
 533 }
 534
 535 template <class Parent>
 536 JSValue JSCallbackObject<Parent>::staticFunctionGetter(ExecState* exec, JSValue slotParent, const Identifier& propertyName)
 537 {
 538     JSCallbackObject* thisObj = asCallbackObject(slotParent);
 539
 540     // Check for cached or override property.
 541     PropertySlot slot2(thisObj);
 542     if (Parent::getOwnPropertySlot(thisObj, exec, propertyName, slot2))
 543         return slot2.getValue(exec, propertyName);
 544
 545     for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass) {
 546         if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
 547             if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
 548                 if (JSObjectCallAsFunctionCallback callAsFunction = entry->callAsFunction) {
 549
 550                     JSObject* o = JSCallbackFunction::create(exec, thisObj->globalObject(), callAsFunction, propertyName);
 551                     thisObj->putDirect(exec->globalData(), propertyName, o, entry->attributes);
 552                     return o;
 553                 }
 554             }
 555         }
 556     }
 557
 558     return throwError(exec, createReferenceError(exec, "Static function property defined with NULL callAsFunction callback."));
 559 }
 560
 561 template <class Parent>
 562 JSValue JSCallbackObject<Parent>::callbackGetter(ExecState* exec, JSValue slotParent, const Identifier& propertyName)
 563 {
 564     JSCallbackObject* thisObj = asCallbackObject(slotParent);
 565
 566     JSObjectRef thisRef = toRef(thisObj);
 567     RefPtr<OpaqueJSString> propertyNameRef;
 568
 569     for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass)
 570         if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
 571             if (!propertyNameRef)
 572                 propertyNameRef = OpaqueJSString::create(propertyName.ustring());
 573             JSValueRef exception = 0;
 574             JSValueRef value;
 575             {
 576                 APICallbackShim callbackShim(exec);
 577                 value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
 578             }
 579             if (exception) {
 580                 throwError(exec, toJS(exec, exception));
 581                 return jsUndefined();
 582             }
 583             if (value)
 584                 return toJS(exec, value);
 585         }
 586
 587     return throwError(exec, createReferenceError(exec, "hasProperty callback returned true for a property that doesn't exist."));
 588 }
 589
 590 } // namespace JSC