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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/dom/UserGestureIndicator.h"
     42 #include "core/page/DOMWindow.h"
     43 #include "core/page/Frame.h"
     44 #include "wtf/OwnArrayPtr.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 WrapperTypeInfo* npObjectTypeInfo()
     55 {
     56     static WrapperTypeInfo typeInfo = { 0, 0, 0, 0, 0, 0, 0, WrapperTypeObjectPrototype };
     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);
     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 v8::Local<v8::Context> toV8Context(NPP npp, NPObject* npObject)
     81 {
     82     ASSERT(npObject->_class == &V8NPObjectClass);
     83     V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);
     84     DOMWindow* window = object->rootObject;
     85     if (!window || !window->isCurrentlyDisplayedInFrame())
     86         return v8::Local<v8::Context>();
     87     return ScriptController::mainWorldContext(object->rootObject->frame());
     88 }
     89 
     90 static PassOwnArrayPtr<v8::Handle<v8::Value> > createValueListFromVariantArgs(const NPVariant* arguments, uint32_t argumentCount, NPObject* owner, v8::Isolate* isolate)
     91 {
     92     OwnArrayPtr<v8::Handle<v8::Value> > argv = adoptArrayPtr(new v8::Handle<v8::Value>[argumentCount]);
     93     for (uint32_t index = 0; index < argumentCount; index++) {
     94         const NPVariant* arg = &arguments[index];
     95         argv[index] = convertNPVariantToV8Object(arg, owner, isolate);
     96     }
     97     return argv.release();
     98 }
     99 
    100 // Create an identifier (null terminated utf8 char*) from the NPIdentifier.
    101 static v8::Local<v8::String> npIdentifierToV8Identifier(NPIdentifier name)
    102 {
    103     PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(name);
    104     if (identifier->isString)
    105         return v8::String::NewSymbol(static_cast<const char*>(identifier->value.string));
    106 
    107     char buffer[32];
    108     snprintf(buffer, sizeof(buffer), "%d", identifier->value.number);
    109     return v8::String::NewSymbol(buffer);
    110 }
    111 
    112 NPObject* v8ObjectToNPObject(v8::Handle<v8::Object> object)
    113 {
    114     return reinterpret_cast<NPObject*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
    115 }
    116 
    117 NPObject* npCreateV8ScriptObject(NPP npp, v8::Handle<v8::Object> object, DOMWindow* root)
    118 {
    119     // Check to see if this object is already wrapped.
    120     if (object->InternalFieldCount() == npObjectInternalFieldCount) {
    121         WrapperTypeInfo* typeInfo = static_cast<WrapperTypeInfo*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
    122         if (typeInfo == npObjectTypeInfo()) {
    123             NPObject* returnValue = v8ObjectToNPObject(object);
    124             _NPN_RetainObject(returnValue);
    125             return returnValue;
    126         }
    127     }
    128 
    129     V8NPObjectVector* objectVector = 0;
    130     if (V8PerContextData* perContextData = V8PerContextData::from(object->CreationContext())) {
    131         int v8ObjectHash = object->GetIdentityHash();
    132         ASSERT(v8ObjectHash);
    133         V8NPObjectMap* v8NPObjectMap = perContextData->v8NPObjectMap();
    134         V8NPObjectMap::iterator iter = v8NPObjectMap->find(v8ObjectHash);
    135         if (iter != v8NPObjectMap->end()) {
    136             V8NPObjectVector& objects = iter->value;
    137             for (size_t index = 0; index < objects.size(); ++index) {
    138                 V8NPObject* v8npObject = objects.at(index);
    139                 if (v8npObject->v8Object == object && v8npObject->rootObject == root) {
    140                     _NPN_RetainObject(&v8npObject->object);
    141                     return reinterpret_cast<NPObject*>(v8npObject);
    142                 }
    143             }
    144         } else {
    145             iter = v8NPObjectMap->set(v8ObjectHash, V8NPObjectVector()).iterator;
    146         }
    147         objectVector = &iter->value;
    148     }
    149 
    150     V8NPObject* v8npObject = reinterpret_cast<V8NPObject*>(_NPN_CreateObject(npp, &V8NPObjectClass));
    151     // This is uninitialized memory, we need to clear it so that
    152     // Persistent::Reset won't try to Dispose anything bogus.
    153     v8npObject->v8Object.Clear();
    154     v8npObject->v8Object.Reset(v8::Isolate::GetCurrent(), object);
    155     v8npObject->rootObject = root;
    156 
    157     if (objectVector)
    158         objectVector->append(v8npObject);
    159 
    160     return reinterpret_cast<NPObject*>(v8npObject);
    161 }
    162 
    163 V8NPObject* npObjectToV8NPObject(NPObject* npObject)
    164 {
    165     if (npObject->_class != &V8NPObjectClass)
    166         return 0;
    167     V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);
    168     if (v8NpObject->v8Object.IsEmpty())
    169         return 0;
    170     return v8NpObject;
    171 }
    172 
    173 void disposeUnderlyingV8Object(NPObject* npObject)
    174 {
    175     ASSERT(npObject);
    176     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
    177     if (!v8NpObject)
    178         return;
    179     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    180     v8::HandleScope scope(isolate);
    181     v8::Handle<v8::Object> v8Object = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
    182     ASSERT(!v8Object->CreationContext().IsEmpty());
    183     if (V8PerContextData* perContextData = V8PerContextData::from(v8Object->CreationContext())) {
    184         V8NPObjectMap* v8NPObjectMap = perContextData->v8NPObjectMap();
    185         int v8ObjectHash = v8Object->GetIdentityHash();
    186         ASSERT(v8ObjectHash);
    187         V8NPObjectMap::iterator iter = v8NPObjectMap->find(v8ObjectHash);
    188         if (iter != v8NPObjectMap->end()) {
    189             V8NPObjectVector& objects = iter->value;
    190             for (size_t index = 0; index < objects.size(); ++index) {
    191                 if (objects.at(index) == v8NpObject) {
    192                     objects.remove(index);
    193                     break;
    194                 }
    195             }
    196             if (objects.isEmpty())
    197                 v8NPObjectMap->remove(v8ObjectHash);
    198         }
    199     }
    200     v8NpObject->v8Object.Dispose();
    201     v8NpObject->v8Object.Clear();
    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     v8::HandleScope handleScope(isolate);
    236     // FIXME: should use the plugin's owner frame as the security context.
    237     v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    238     if (context.IsEmpty())
    239         return false;
    240 
    241     v8::Context::Scope scope(context);
    242     ExceptionCatcher exceptionCatcher;
    243 
    244     v8::Handle<v8::Object> v8Object = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
    245     v8::Handle<v8::Value> functionObject = v8Object->Get(v8::String::NewSymbol(identifier->value.string));
    246     if (functionObject.IsEmpty() || functionObject->IsNull()) {
    247         NULL_TO_NPVARIANT(*result);
    248         return false;
    249     }
    250     if (functionObject->IsUndefined()) {
    251         VOID_TO_NPVARIANT(*result);
    252         return false;
    253     }
    254 
    255     Frame* frame = v8NpObject->rootObject->frame();
    256     ASSERT(frame);
    257 
    258     // Call the function object.
    259     v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(functionObject);
    260     OwnArrayPtr<v8::Handle<v8::Value> > argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
    261     v8::Local<v8::Value> resultObject = frame->script()->callFunction(function, v8Object, argumentCount, argv.get());
    262 
    263     // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
    264     // successfully invoked".  If we get an error return value, was that successfully invoked?
    265     if (resultObject.IsEmpty())
    266         return false;
    267 
    268     convertV8ObjectToNPVariant(resultObject, npObject, result);
    269     return true;
    270 }
    271 
    272 // FIXME: Fix it same as _NPN_Invoke (HandleScope and such).
    273 bool _NPN_InvokeDefault(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
    274 {
    275     if (!npObject)
    276         return false;
    277 
    278     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    279 
    280     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
    281     if (!v8NpObject) {
    282         if (npObject->_class->invokeDefault)
    283             return npObject->_class->invokeDefault(npObject, arguments, argumentCount, result);
    284 
    285         VOID_TO_NPVARIANT(*result);
    286         return true;
    287     }
    288 
    289     VOID_TO_NPVARIANT(*result);
    290 
    291     v8::HandleScope handleScope(isolate);
    292     v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    293     if (context.IsEmpty())
    294         return false;
    295 
    296     v8::Context::Scope scope(context);
    297     ExceptionCatcher exceptionCatcher;
    298 
    299     // Lookup the function object and call it.
    300     v8::Local<v8::Object> functionObject = v8::Local<v8::Object>::New(isolate, v8NpObject->v8Object);
    301     if (!functionObject->IsFunction())
    302         return false;
    303 
    304     v8::Local<v8::Value> resultObject;
    305     v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(functionObject);
    306     if (!function->IsNull()) {
    307         Frame* frame = v8NpObject->rootObject->frame();
    308         ASSERT(frame);
    309 
    310         OwnArrayPtr<v8::Handle<v8::Value> > argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
    311         resultObject = frame->script()->callFunction(function, functionObject, argumentCount, argv.get());
    312     }
    313     // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
    314     // successfully invoked".  If we get an error return value, was that successfully invoked?
    315     if (resultObject.IsEmpty())
    316         return false;
    317 
    318     convertV8ObjectToNPVariant(resultObject, npObject, result);
    319     return true;
    320 }
    321 
    322 bool _NPN_Evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* result)
    323 {
    324     // FIXME: Give the embedder a way to control this.
    325     bool popupsAllowed = false;
    326     return _NPN_EvaluateHelper(npp, popupsAllowed, npObject, npScript, result);
    327 }
    328 
    329 bool _NPN_EvaluateHelper(NPP npp, bool popupsAllowed, NPObject* npObject, NPString* npScript, NPVariant* result)
    330 {
    331     VOID_TO_NPVARIANT(*result);
    332     if (!npObject)
    333         return false;
    334 
    335     V8NPObject* v8NpObject = npObjectToV8NPObject(npObject);
    336     if (!v8NpObject)
    337         return false;
    338 
    339     v8::HandleScope handleScope;
    340     v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    341     if (context.IsEmpty())
    342         return false;
    343 
    344     v8::Context::Scope scope(context);
    345     ExceptionCatcher exceptionCatcher;
    346 
    347     // FIXME: Is this branch still needed after switching to using UserGestureIndicator?
    348     String filename;
    349     if (!popupsAllowed)
    350         filename = "npscript";
    351 
    352     Frame* frame = v8NpObject->rootObject->frame();
    353     ASSERT(frame);
    354 
    355     String script = String::fromUTF8(npScript->UTF8Characters, npScript->UTF8Length);
    356 
    357     UserGestureIndicator gestureIndicator(popupsAllowed ? DefinitelyProcessingNewUserGesture : PossiblyProcessingUserGesture);
    358     v8::Local<v8::Value> v8result = frame->script()->compileAndRunScript(ScriptSourceCode(script, KURL(ParsedURLString, filename)));
    359 
    360     if (v8result.IsEmpty())
    361         return false;
    362 
    363     if (_NPN_IsAlive(npObject))
    364         convertV8ObjectToNPVariant(v8result, npObject, result);
    365     return true;
    366 }
    367 
    368 bool _NPN_GetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, NPVariant* result)
    369 {
    370     if (!npObject)
    371         return false;
    372 
    373     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    374         v8::Isolate* isolate = v8::Isolate::GetCurrent();
    375         v8::HandleScope handleScope(isolate);
    376         v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    377         if (context.IsEmpty())
    378             return false;
    379 
    380         v8::Context::Scope scope(context);
    381         ExceptionCatcher exceptionCatcher;
    382 
    383         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    384         v8::Local<v8::Value> v8result = obj->Get(npIdentifierToV8Identifier(propertyName));
    385 
    386         if (v8result.IsEmpty())
    387             return false;
    388 
    389         convertV8ObjectToNPVariant(v8result, npObject, result);
    390         return true;
    391     }
    392 
    393     if (npObject->_class->hasProperty && npObject->_class->getProperty) {
    394         if (npObject->_class->hasProperty(npObject, propertyName))
    395             return npObject->_class->getProperty(npObject, propertyName, result);
    396     }
    397 
    398     VOID_TO_NPVARIANT(*result);
    399     return false;
    400 }
    401 
    402 bool _NPN_SetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, const NPVariant* value)
    403 {
    404     if (!npObject)
    405         return false;
    406 
    407     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    408         v8::Isolate* isolate = v8::Isolate::GetCurrent();
    409         v8::HandleScope handleScope(isolate);
    410         v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    411         if (context.IsEmpty())
    412             return false;
    413 
    414         v8::Context::Scope scope(context);
    415         ExceptionCatcher exceptionCatcher;
    416 
    417         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    418         obj->Set(npIdentifierToV8Identifier(propertyName), convertNPVariantToV8Object(value, object->rootObject->frame()->script()->windowScriptNPObject(), context->GetIsolate()));
    419         return true;
    420     }
    421 
    422     if (npObject->_class->setProperty)
    423         return npObject->_class->setProperty(npObject, propertyName, value);
    424 
    425     return false;
    426 }
    427 
    428 bool _NPN_RemoveProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
    429 {
    430     if (!npObject)
    431         return false;
    432 
    433     V8NPObject* object = npObjectToV8NPObject(npObject);
    434     if (!object)
    435         return false;
    436 
    437     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    438     v8::HandleScope handleScope(isolate);
    439     v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    440     if (context.IsEmpty())
    441         return false;
    442     v8::Context::Scope scope(context);
    443     ExceptionCatcher exceptionCatcher;
    444 
    445     v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    446     // FIXME: Verify that setting to undefined is right.
    447     obj->Set(npIdentifierToV8Identifier(propertyName), v8::Undefined());
    448     return true;
    449 }
    450 
    451 bool _NPN_HasProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
    452 {
    453     if (!npObject)
    454         return false;
    455 
    456     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    457         v8::Isolate* isolate = v8::Isolate::GetCurrent();
    458         v8::HandleScope handleScope(isolate);
    459         v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    460         if (context.IsEmpty())
    461             return false;
    462         v8::Context::Scope scope(context);
    463         ExceptionCatcher exceptionCatcher;
    464 
    465         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    466         return obj->Has(npIdentifierToV8Identifier(propertyName));
    467     }
    468 
    469     if (npObject->_class->hasProperty)
    470         return npObject->_class->hasProperty(npObject, propertyName);
    471     return false;
    472 }
    473 
    474 bool _NPN_HasMethod(NPP npp, NPObject* npObject, NPIdentifier methodName)
    475 {
    476     if (!npObject)
    477         return false;
    478 
    479     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    480         v8::Isolate* isolate = v8::Isolate::GetCurrent();
    481         v8::HandleScope handleScope(isolate);
    482         v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    483         if (context.IsEmpty())
    484             return false;
    485         v8::Context::Scope scope(context);
    486         ExceptionCatcher exceptionCatcher;
    487 
    488         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    489         v8::Handle<v8::Value> prop = obj->Get(npIdentifierToV8Identifier(methodName));
    490         return prop->IsFunction();
    491     }
    492 
    493     if (npObject->_class->hasMethod)
    494         return npObject->_class->hasMethod(npObject, methodName);
    495     return false;
    496 }
    497 
    498 void _NPN_SetException(NPObject* npObject, const NPUTF8 *message)
    499 {
    500     if (!npObject || !npObjectToV8NPObject(npObject)) {
    501         // We won't be able to find a proper scope for this exception, so just throw it.
    502         // This is consistent with JSC, which throws a global exception all the time.
    503         throwError(v8GeneralError, message, v8::Isolate::GetCurrent());
    504         return;
    505     }
    506 
    507     v8::HandleScope handleScope;
    508     v8::Handle<v8::Context> context = toV8Context(0, npObject);
    509     if (context.IsEmpty())
    510         return;
    511 
    512     v8::Context::Scope scope(context);
    513     ExceptionCatcher exceptionCatcher;
    514 
    515     throwError(v8GeneralError, message, context->GetIsolate());
    516 }
    517 
    518 bool _NPN_Enumerate(NPP npp, NPObject* npObject, NPIdentifier** identifier, uint32_t* count)
    519 {
    520     if (!npObject)
    521         return false;
    522 
    523     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    524         v8::Isolate* isolate = v8::Isolate::GetCurrent();
    525         v8::HandleScope handleScope(isolate);
    526         v8::Local<v8::Context> context = toV8Context(npp, npObject);
    527         if (context.IsEmpty())
    528             return false;
    529         v8::Context::Scope scope(context);
    530         ExceptionCatcher exceptionCatcher;
    531 
    532         v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    533 
    534         // FIXME: http://b/issue?id=1210340: Use a v8::Object::Keys() method when it exists, instead of evaluating javascript.
    535 
    536         // FIXME: Figure out how to cache this helper function.  Run a helper function that collects the properties
    537         // on the object into an array.
    538         const char enumeratorCode[] =
    539             "(function (obj) {"
    540             "  var props = [];"
    541             "  for (var prop in obj) {"
    542             "    props[props.length] = prop;"
    543             "  }"
    544             "  return props;"
    545             "});";
    546         v8::Handle<v8::String> source = v8::String::New(enumeratorCode);
    547         v8::Handle<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(source, context->GetIsolate());
    548         ASSERT(!result.IsEmpty());
    549         ASSERT(result->IsFunction());
    550         v8::Handle<v8::Function> enumerator = v8::Handle<v8::Function>::Cast(result);
    551         v8::Handle<v8::Value> argv[] = { obj };
    552         v8::Local<v8::Value> propsObj = V8ScriptRunner::callInternalFunction(enumerator, v8::Handle<v8::Object>::Cast(result), WTF_ARRAY_LENGTH(argv), argv, context->GetIsolate());
    553         if (propsObj.IsEmpty())
    554             return false;
    555 
    556         // Convert the results into an array of NPIdentifiers.
    557         v8::Handle<v8::Array> props = v8::Handle<v8::Array>::Cast(propsObj);
    558         *count = props->Length();
    559         *identifier = static_cast<NPIdentifier*>(malloc(sizeof(NPIdentifier*) * *count));
    560         for (uint32_t i = 0; i < *count; ++i) {
    561             v8::Local<v8::Value> name = props->Get(v8::Integer::New(i, context->GetIsolate()));
    562             (*identifier)[i] = getStringIdentifier(v8::Local<v8::String>::Cast(name));
    563         }
    564         return true;
    565     }
    566 
    567     if (NP_CLASS_STRUCT_VERSION_HAS_ENUM(npObject->_class) && npObject->_class->enumerate)
    568        return npObject->_class->enumerate(npObject, identifier, count);
    569 
    570     return false;
    571 }
    572 
    573 bool _NPN_Construct(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
    574 {
    575     if (!npObject)
    576         return false;
    577 
    578     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    579 
    580     if (V8NPObject* object = npObjectToV8NPObject(npObject)) {
    581         v8::HandleScope handleScope(isolate);
    582         v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    583         if (context.IsEmpty())
    584             return false;
    585         v8::Context::Scope scope(context);
    586         ExceptionCatcher exceptionCatcher;
    587 
    588         // Lookup the constructor function.
    589         v8::Handle<v8::Object> ctorObj = v8::Local<v8::Object>::New(isolate, object->v8Object);
    590         if (!ctorObj->IsFunction())
    591             return false;
    592 
    593         // Call the constructor.
    594         v8::Local<v8::Value> resultObject;
    595         v8::Handle<v8::Function> ctor = v8::Handle<v8::Function>::Cast(ctorObj);
    596         if (!ctor->IsNull()) {
    597             Frame* frame = object->rootObject->frame();
    598             ASSERT(frame);
    599             OwnArrayPtr<v8::Handle<v8::Value> > argv = createValueListFromVariantArgs(arguments, argumentCount, npObject, isolate);
    600             resultObject = V8ObjectConstructor::newInstanceInDocument(ctor, argumentCount, argv.get(), frame ? frame->document() : 0);
    601         }
    602 
    603         if (resultObject.IsEmpty())
    604             return false;
    605 
    606         convertV8ObjectToNPVariant(resultObject, npObject, result);
    607         return true;
    608     }
    609 
    610     if (NP_CLASS_STRUCT_VERSION_HAS_CTOR(npObject->_class) && npObject->_class->construct)
    611         return npObject->_class->construct(npObject, arguments, argumentCount, result);
    612 
    613     return false;
    614 }
    615