src/third_party/WebKit/Source/bindings/v8/NPV8Object.cpp

   1 /*
   2  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
   3  * Copyright (C) 2007, 2008, 2009 Google, Inc.  All rights reserved.
   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 "config.h"
  28
  29 #include "bindings/v8/NPV8Object.h"
  30
  31 #include "bindings/v8/ScriptController.h"
  32 #include "bindings/v8/ScriptSourceCode.h"
  33 #include "bindings/v8/V8Binding.h"
  34 #include "bindings/v8/V8GCController.h"
  35 #include "bindings/v8/V8NPUtils.h"
  36 #include "bindings/v8/V8ObjectConstructor.h"
  37 #include "bindings/v8/V8ScriptRunner.h"
  38 #include "bindings/v8/WrapperTypeInfo.h"
  39 #include "bindings/v8/npruntime_impl.h"
  40 #include "bindings/v8/npruntime_priv.h"
  41 #include "core/frame/LocalDOMWindow.h"
  42 #include "core/frame/LocalFrame.h"
  43 #include "platform/UserGestureIndicator.h"
  44 #include "wtf/OwnPtr.h"
  45
  46 #include <stdio.h>
  47 #include "wtf/StringExtras.h"
  48 #include "wtf/text/WTFString.h"
  49
  50 using namespace WebCore;
  51
  52 namespace WebCore {
  53
  54 const WrapperTypeInfo* npObjectTypeInfo()
  55 {
  56     static const WrapperTypeInfo typeInfo = { gin::kEmbedderBlink, 0, 0, 0, 0, 0, 0, 0, WrapperTypeObjectPrototype, RefCountedObject };
  57     return &typeInfo;
  58 }
  59
  60 // FIXME: Comments on why use malloc and free.
  61 static NPObject* allocV8NPObject(NPP, NPClass*)
  62 {
  63     return static_cast<NPObject*>(malloc(sizeof(V8NPObject)));
  64 }
  65
  66 static void freeV8NPObject(NPObject* npObject)
  67 {
  68     V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);
  69     disposeUnderlyingV8Object(npObject, v8::Isolate::GetCurrent());
  70     free(v8NpObject);
  71 }
  72
  73 static NPClass V8NPObjectClass = {
  74     NP_CLASS_STRUCT_VERSION,
  75     allocV8NPObject,
  76     freeV8NPObject,
  77     0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  78 };
  79
  80 static ScriptState* mainWorldScriptState(v8::Isolate* isolate, NPP npp, NPObject* npObject)
  81 {
  82     ASSERT(npObject->_class == &V8NPObjectClass);
  83     V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);
  84     LocalDOMWindow* window = object->rootObject;
  85     if (!window || !window->isCurrentlyDisplayedInFrame())
  86         return 0;
  87     v8::HandleScope handleScope(isolate);
  88     v8::Handle<v8::Context> context = toV8Context(object->rootObject->frame(), DOMWrapperWorld::mainWorld());
  89     return ScriptState::from(context);
  90 }
  91
  92 static PassOwnPtr<v8::Handle<v8::Value>[]> createValueListFromVariantArgs(const NPVariant* arguments, uint32_t argumentCount, NPObject* owner, v8::Isolate* isolate)
  93 {
  94     OwnPtr<v8::Handle<v8::Value>[]> argv = adoptArrayPtr(new v8::Handle<v8::Value>[argumentCount]);
  95     for (uint32_t index = 0; index < argumentCount; index++) {
  96         const NPVariant* arg = &arguments[index];
  97         argv[index] = convertNPVariantToV8Object(arg, owner, isolate);
  98     }
  99     return argv.release();
 100 }
 101
 102 // Create an identifier (null terminated utf8 char*) from the NPIdentifier.
 103 static v8::Local<v8::String> npIdentifierToV8Identifier(NPIdentifier name, v8::Isolate* isolate)
 104 {
 105     PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(name);
 106     if (identifier->isString)
 107         return v8AtomicString(isolate, static_cast<const char*>(identifier->value.string));
 108
 109     char buffer[32];
 110     snprintf(buffer, sizeof(buffer), "%d", identifier->value.number);
 111     return v8AtomicString(isolate, buffer);
 112 }
 113
 114 NPObject* v8ObjectToNPObject(v8::Handle<v8::Object> object)
 115 {
 116     return reinterpret_cast<NPObject*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
 117 }
 118
 119 NPObject* npCreateV8ScriptObject(NPP npp, v8::Handle<v8::Object> object, LocalDOMWindow* root, v8::Isolate* isolate)
 120 {
 121     // Check to see if this object is already wrapped.
 122     if (object->InternalFieldCount() == npObjectInternalFieldCount) {
 123         const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
 124         if (typeInfo == npObjectTypeInfo()) {
 125             NPObject* returnValue = v8ObjectToNPObject(object);
 126             _NPN_RetainObject(returnValue);
 127             return returnValue;
 128         }
 129     }
 130
 131     V8NPObjectVector* objectVector = 0;
 132     if (V8PerContextData* perContextData = V8PerContextData::from(object->CreationContext())) {
 133         int v8ObjectHash = object->GetIdentityHash();
 134         ASSERT(v8ObjectHash);
 135         V8NPObjectMap* v8NPObjectMap = perContextData->v8NPObjectMap();
 136         V8NPObjectMap::iterator iter = v8NPObjectMap->find(v8ObjectHash);
 137         if (iter != v8NPObjectMap->end()) {
 138             V8NPObjectVector& objects = iter->value;
 139             for (size_t index = 0; index < objects.size(); ++index) {
 140                 V8NPObject* v8npObject = objects.at(index);
 141                 if (v8npObject->v8Object == object && v8npObject->rootObject == root) {
 142                     _NPN_RetainObject(&v8npObject->object);
 143                     return reinterpret_cast<NPObject*>(v8npObject);
 144                 }
 145             }
 146             objectVector = &iter->value;
 147         } else {
 148             objectVector = &v8NPObjectMap->set(v8ObjectHash, V8NPObjectVector()).storedValue->value;
 149         }
 150     }
 151
 152     V8NPObject* v8npObject = reinterpret_cast<V8NPObject*>(_NPN_CreateObject(npp, &V8NPObjectClass));
 153     // This is uninitialized memory, we need to clear it so that
 154     // Persistent::Reset won't try to Dispose anything bogus.
 155     new (&v8npObject->v8Object) v8::Persistent<v8::Object>();
 156     v8npObject->v8Object.Reset(isolate, object);
 157     v8npObject->rootObject = root;
 158
 159     if (objectVector)
 160         objectVector->append(v8npObject);
 161
 162     return reinterpret_cast<NPObject*>(v8npObject);
 163 }
 164
 165 V8NPObject* npObjectToV8NPObject(NPObject* npObject)
 166 {
 167     if (npObject->_class != &V8NPObjectClass)
 168         return 0;
 169     V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);
 170     if (v8NpObject->v8Object.IsEmpty())
 171         return 0;
 172     return v8NpObject;
 173 }
 174
 175 void disposeUnderlyingV8Object(NPObject* npObject, v8::Isolate* isolate)
 176 {
 177     ASSERT(npObject);
 178     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
 179     if (!v8NpObject)
 180         return;
 181     v8::HandleScope scope(isolate);
 182     v8::Handle<v8::Object> v8Object = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
 183     ASSERT(!v8Object->CreationContext().IsEmpty());
 184     if (V8PerContextData* perContextData = V8PerContextData::from(v8Object->CreationContext())) {
 185         V8NPObjectMap* v8NPObjectMap = perContextData->v8NPObjectMap();
 186         int v8ObjectHash = v8Object->GetIdentityHash();
 187         ASSERT(v8ObjectHash);
 188         V8NPObjectMap::iterator iter = v8NPObjectMap->find(v8ObjectHash);
 189         if (iter != v8NPObjectMap->end()) {
 190             V8NPObjectVector& objects = iter->value;
 191             for (size_t index = 0; index < objects.size(); ++index) {
 192                 if (objects.at(index) == v8NpObject) {
 193                     objects.remove(index);
 194                     break;
 195                 }
 196             }
 197             if (objects.isEmpty())
 198                 v8NPObjectMap->remove(v8ObjectHash);
 199         }
 200     }
 201     v8NpObject->v8Object.Reset();
 202     v8NpObject->rootObject = 0;
 203 }
 204
 205 } // namespace WebCore
 206
 207 bool _NPN_Invoke(NPP npp, NPObject* npObject, NPIdentifier methodName, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
 208 {
 209     if (!npObject)
 210         return false;
 211
 212     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 213
 214     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
 215     if (!v8NpObject) {
 216         if (npObject->_class->invoke)
 217             return npObject->_class->invoke(npObject, methodName, arguments, argumentCount, result);
 218
 219         VOID_TO_NPVARIANT(*result);
 220         return true;
 221     }
 222
 223     PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(methodName);
 224     if (!identifier->isString)
 225         return false;
 226
 227     if (!strcmp(identifier->value.string, "eval")) {
 228         if (argumentCount != 1)
 229             return false;
 230         if (arguments[0].type != NPVariantType_String)
 231             return false;
 232         return _NPN_Evaluate(npp, npObject, const_cast<NPString*>(&arguments[0].value.stringValue), result);
 233     }
 234
 235     // FIXME: should use the plugin's owner frame as the security context.
 236     ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 237     if (!scriptState)
 238         return false;
 239
 240     ScriptState::Scope scope(scriptState);
 241     ExceptionCatcher exceptionCatcher;
 242
 243     v8::Handle<v8::Object> v8Object = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
 244     v8::Handle<v8::Value> functionObject = v8Object->Get(v8AtomicString(isolate, identifier->value.string));
 245     if (functionObject.IsEmpty() || functionObject->IsNull()) {
 246         NULL_TO_NPVARIANT(*result);
 247         return false;
 248     }
 249     if (functionObject->IsUndefined()) {
 250         VOID_TO_NPVARIANT(*result);
 251         return false;
 252     }
 253
 254     LocalFrame* frame = v8NpObject->rootObject->frame();
 255     ASSERT(frame);
 256
 257     // Call the function object.
 258     v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(functionObject);
 259     OwnPtr<v8::Handle<v8::Value>[]> argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
 260     v8::Local<v8::Value> resultObject = frame->script().callFunction(function, v8Object, argumentCount, argv.get());
 261
 262     // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
 263     // successfully invoked".  If we get an error return value, was that successfully invoked?
 264     if (resultObject.IsEmpty())
 265         return false;
 266
 267     convertV8ObjectToNPVariant(resultObject, npObject, result, isolate);
 268     return true;
 269 }
 270
 271 // FIXME: Fix it same as _NPN_Invoke (HandleScope and such).
 272 bool _NPN_InvokeDefault(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
 273 {
 274     if (!npObject)
 275         return false;
 276
 277     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 278
 279     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
 280     if (!v8NpObject) {
 281         if (npObject->_class->invokeDefault)
 282             return npObject->_class->invokeDefault(npObject, arguments, argumentCount, result);
 283
 284         VOID_TO_NPVARIANT(*result);
 285         return true;
 286     }
 287
 288     VOID_TO_NPVARIANT(*result);
 289
 290     ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 291     if (!scriptState)
 292         return false;
 293
 294     ScriptState::Scope scope(scriptState);
 295     ExceptionCatcher exceptionCatcher;
 296
 297     // Lookup the function object and call it.
 298     v8::Local<v8::Object> functionObject = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
 299     if (!functionObject->IsFunction())
 300         return false;
 301
 302     v8::Local<v8::Value> resultObject;
 303     v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(functionObject);
 304     if (!function->IsNull()) {
 305         LocalFrame* frame = v8NpObject->rootObject->frame();
 306         ASSERT(frame);
 307
 308         OwnPtr<v8::Handle<v8::Value>[]> argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
 309         resultObject = frame->script().callFunction(function, functionObject, argumentCount, argv.get());
 310     }
 311     // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
 312     // successfully invoked".  If we get an error return value, was that successfully invoked?
 313     if (resultObject.IsEmpty())
 314         return false;
 315
 316     convertV8ObjectToNPVariant(resultObject, npObject, result, isolate);
 317     return true;
 318 }
 319
 320 bool _NPN_Evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* result)
 321 {
 322     // FIXME: Give the embedder a way to control this.
 323     bool popupsAllowed = false;
 324     return _NPN_EvaluateHelper(npp, popupsAllowed, npObject, npScript, result);
 325 }
 326
 327 bool _NPN_EvaluateHelper(NPP npp, bool popupsAllowed, NPObject* npObject, NPString* npScript, NPVariant* result)
 328 {
 329     VOID_TO_NPVARIANT(*result);
 330     if (!npObject)
 331         return false;
 332
 333     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
 334     if (!v8NpObject)
 335         return false;
 336
 337     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 338     ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 339     if (!scriptState)
 340         return false;
 341
 342     ScriptState::Scope scope(scriptState);
 343     ExceptionCatcher exceptionCatcher;
 344
 345     // FIXME: Is this branch still needed after switching to using UserGestureIndicator?
 346     String filename;
 347     if (!popupsAllowed)
 348         filename = "npscript";
 349
 350     LocalFrame* frame = v8NpObject->rootObject->frame();
 351     ASSERT(frame);
 352
 353     String script = String::fromUTF8(npScript->UTF8Characters, npScript->UTF8Length);
 354
 355     UserGestureIndicator gestureIndicator(popupsAllowed ? DefinitelyProcessingNewUserGesture : PossiblyProcessingUserGesture);
 356     v8::Local<v8::Value> v8result = frame->script().executeScriptAndReturnValue(scriptState->context(), ScriptSourceCode(script, KURL(ParsedURLString, filename)));
 357
 358     if (v8result.IsEmpty())
 359         return false;
 360
 361     if (_NPN_IsAlive(npObject))
 362         convertV8ObjectToNPVariant(v8result, npObject, result, isolate);
 363     return true;
 364 }
 365
 366 bool _NPN_GetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, NPVariant* result)
 367 {
 368     if (!npObject)
 369         return false;
 370
 371     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 372         v8::Isolate* isolate = v8::Isolate::GetCurrent();
 373         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 374         if (!scriptState)
 375             return false;
 376
 377         ScriptState::Scope scope(scriptState);
 378         ExceptionCatcher exceptionCatcher;
 379
 380         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 381         v8::Local<v8::Value> v8result = obj->Get(npIdentifierToV8Identifier(propertyName, isolate));
 382
 383         if (v8result.IsEmpty())
 384             return false;
 385
 386         convertV8ObjectToNPVariant(v8result, npObject, result, isolate);
 387         return true;
 388     }
 389
 390     if (npObject->_class->hasProperty && npObject->_class->getProperty) {
 391         if (npObject->_class->hasProperty(npObject, propertyName))
 392             return npObject->_class->getProperty(npObject, propertyName, result);
 393     }
 394
 395     VOID_TO_NPVARIANT(*result);
 396     return false;
 397 }
 398
 399 bool _NPN_SetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, const NPVariant* value)
 400 {
 401     if (!npObject)
 402         return false;
 403
 404     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 405         v8::Isolate* isolate = v8::Isolate::GetCurrent();
 406         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 407         if (!scriptState)
 408             return false;
 409
 410         ScriptState::Scope scope(scriptState);
 411         ExceptionCatcher exceptionCatcher;
 412
 413         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 414         obj->Set(npIdentifierToV8Identifier(propertyName, isolate), convertNPVariantToV8Object(value, object->rootObject->frame()->script().windowScriptNPObject(), isolate));
 415         return true;
 416     }
 417
 418     if (npObject->_class->setProperty)
 419         return npObject->_class->setProperty(npObject, propertyName, value);
 420
 421     return false;
 422 }
 423
 424 bool _NPN_RemoveProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
 425 {
 426     if (!npObject)
 427         return false;
 428
 429     V8NPObject* object = npObjectToV8NPObject(npObject);
 430     if (!object)
 431         return false;
 432
 433     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 434     ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 435     if (!scriptState)
 436         return false;
 437     ScriptState::Scope scope(scriptState);
 438     ExceptionCatcher exceptionCatcher;
 439
 440     v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 441     // FIXME: Verify that setting to undefined is right.
 442     obj->Set(npIdentifierToV8Identifier(propertyName, isolate), v8::Undefined(isolate));
 443     return true;
 444 }
 445
 446 bool _NPN_HasProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
 447 {
 448     if (!npObject)
 449         return false;
 450
 451     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 452         v8::Isolate* isolate = v8::Isolate::GetCurrent();
 453         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 454         if (!scriptState)
 455             return false;
 456         ScriptState::Scope scope(scriptState);
 457         ExceptionCatcher exceptionCatcher;
 458
 459         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 460         return obj->Has(npIdentifierToV8Identifier(propertyName, isolate));
 461     }
 462
 463     if (npObject->_class->hasProperty)
 464         return npObject->_class->hasProperty(npObject, propertyName);
 465     return false;
 466 }
 467
 468 bool _NPN_HasMethod(NPP npp, NPObject* npObject, NPIdentifier methodName)
 469 {
 470     if (!npObject)
 471         return false;
 472
 473     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 474         v8::Isolate* isolate = v8::Isolate::GetCurrent();
 475         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 476         if (!scriptState)
 477             return false;
 478         ScriptState::Scope scope(scriptState);
 479         ExceptionCatcher exceptionCatcher;
 480
 481         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 482         v8::Handle<v8::Value> prop = obj->Get(npIdentifierToV8Identifier(methodName, isolate));
 483         return prop->IsFunction();
 484     }
 485
 486     if (npObject->_class->hasMethod)
 487         return npObject->_class->hasMethod(npObject, methodName);
 488     return false;
 489 }
 490
 491 void _NPN_SetException(NPObject* npObject, const NPUTF8 *message)
 492 {
 493     if (!npObject || !npObjectToV8NPObject(npObject)) {
 494         // We won't be able to find a proper scope for this exception, so just throw it.
 495         // This is consistent with JSC, which throws a global exception all the time.
 496         throwError(v8GeneralError, message, v8::Isolate::GetCurrent());
 497         return;
 498     }
 499
 500     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 501     ScriptState* scriptState = mainWorldScriptState(isolate, 0, npObject);
 502     if (!scriptState)
 503         return;
 504
 505     ScriptState::Scope scope(scriptState);
 506     ExceptionCatcher exceptionCatcher;
 507
 508     throwError(v8GeneralError, message, isolate);
 509 }
 510
 511 bool _NPN_Enumerate(NPP npp, NPObject* npObject, NPIdentifier** identifier, uint32_t* count)
 512 {
 513     if (!npObject)
 514         return false;
 515
 516     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 517         v8::Isolate* isolate = v8::Isolate::GetCurrent();
 518         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 519         if (!scriptState)
 520             return false;
 521         ScriptState::Scope scope(scriptState);
 522         ExceptionCatcher exceptionCatcher;
 523
 524         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 525
 526         // FIXME: http://b/issue?id=1210340: Use a v8::Object::Keys() method when it exists, instead of evaluating javascript.
 527
 528         // FIXME: Figure out how to cache this helper function.  Run a helper function that collects the properties
 529         // on the object into an array.
 530         const char enumeratorCode[] =
 531             "(function (obj) {"
 532             "  var props = [];"
 533             "  for (var prop in obj) {"
 534             "    props[props.length] = prop;"
 535             "  }"
 536             "  return props;"
 537             "});";
 538         v8::Handle<v8::String> source = v8AtomicString(isolate, enumeratorCode);
 539         v8::Handle<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(source, isolate);
 540         ASSERT(!result.IsEmpty());
 541         ASSERT(result->IsFunction());
 542         v8::Handle<v8::Function> enumerator = v8::Handle<v8::Function>::Cast(result);
 543         v8::Handle<v8::Value> argv[] = { obj };
 544         v8::Local<v8::Value> propsObj = V8ScriptRunner::callInternalFunction(enumerator, v8::Handle<v8::Object>::Cast(result), WTF_ARRAY_LENGTH(argv), argv, isolate);
 545         if (propsObj.IsEmpty())
 546             return false;
 547
 548         // Convert the results into an array of NPIdentifiers.
 549         v8::Handle<v8::Array> props = v8::Handle<v8::Array>::Cast(propsObj);
 550         *count = props->Length();
 551         *identifier = static_cast<NPIdentifier*>(calloc(*count, sizeof(NPIdentifier)));
 552         for (uint32_t i = 0; i < *count; ++i) {
 553             v8::Local<v8::Value> name = props->Get(v8::Integer::New(isolate, i));
 554             (*identifier)[i] = getStringIdentifier(v8::Local<v8::String>::Cast(name));
 555         }
 556         return true;
 557     }
 558
 559     if (NP_CLASS_STRUCT_VERSION_HAS_ENUM(npObject->_class) && npObject->_class->enumerate)
 560        return npObject->_class->enumerate(npObject, identifier, count);
 561
 562     return false;
 563 }
 564
 565 bool _NPN_Construct(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
 566 {
 567     if (!npObject)
 568         return false;
 569
 570     v8::Isolate* isolate = v8::Isolate::GetCurrent();
 571
 572     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
 573         ScriptState* scriptState = mainWorldScriptState(isolate, npp, npObject);
 574         if (!scriptState)
 575             return false;
 576         ScriptState::Scope scope(scriptState);
 577         ExceptionCatcher exceptionCatcher;
 578
 579         // Lookup the constructor function.
 580         v8::Handle<v8::Object> ctorObj = v8::Local<v8::Object>::New(isolate, object->v8Object);
 581         if (!ctorObj->IsFunction())
 582             return false;
 583
 584         // Call the constructor.
 585         v8::Local<v8::Value> resultObject;
 586         v8::Handle<v8::Function> ctor = v8::Handle<v8::Function>::Cast(ctorObj);
 587         if (!ctor->IsNull()) {
 588             LocalFrame* frame = object->rootObject->frame();
 589             ASSERT(frame);
 590             OwnPtr<v8::Handle<v8::Value>[]> argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
 591             resultObject = V8ObjectConstructor::newInstanceInDocument(isolate, ctor, argumentCount, argv.get(), frame ? frame->document() : 0);
 592         }
 593
 594         if (resultObject.IsEmpty())
 595             return false;
 596
 597         convertV8ObjectToNPVariant(resultObject, npObject, result, isolate);
 598         return true;
 599     }
 600
 601     if (NP_CLASS_STRUCT_VERSION_HAS_CTOR(npObject->_class) && npObject->_class->construct)
 602         return npObject->_class->construct(npObject, arguments, argumentCount, result);
 603
 604     return false;
 605 }