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      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 }
    606