• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2 * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 
31 #include "config.h"
32 
33 #include "bindings/core/v8/V8NPObject.h"
34 
35 #include "bindings/core/v8/NPV8Object.h"
36 #include "bindings/core/v8/V8Binding.h"
37 #include "bindings/core/v8/V8HTMLAppletElement.h"
38 #include "bindings/core/v8/V8HTMLEmbedElement.h"
39 #include "bindings/core/v8/V8HTMLObjectElement.h"
40 #include "bindings/core/v8/V8NPUtils.h"
41 #include "bindings/core/v8/V8ObjectConstructor.h"
42 #include "bindings/core/v8/V8PersistentValueMap.h"
43 #include "bindings/core/v8/npruntime_impl.h"
44 #include "bindings/core/v8/npruntime_priv.h"
45 #include "core/html/HTMLPlugInElement.h"
46 #include "v8-util.h"
47 #include "wtf/OwnPtr.h"
48 
49 namespace blink {
50 
51 enum InvokeFunctionType {
52     InvokeMethod = 1,
53     InvokeConstruct = 2,
54     InvokeDefault = 3
55 };
56 
57 struct IdentifierRep {
numberblink::IdentifierRep58     int number() const { return m_isString ? 0 : m_value.m_number; }
stringblink::IdentifierRep59     const char* string() const { return m_isString ? m_value.m_string : 0; }
60 
61     union {
62         const char* m_string;
63         int m_number;
64     } m_value;
65     bool m_isString;
66 };
67 
68 // FIXME: need comments.
69 // Params: holder could be HTMLEmbedElement or NPObject
npObjectInvokeImpl(const v8::FunctionCallbackInfo<v8::Value> & info,InvokeFunctionType functionId)70 static void npObjectInvokeImpl(const v8::FunctionCallbackInfo<v8::Value>& info, InvokeFunctionType functionId)
71 {
72     NPObject* npObject;
73     v8::Isolate* isolate = info.GetIsolate();
74 
75     // These three types are subtypes of HTMLPlugInElement.
76     HTMLPlugInElement* element = V8HTMLAppletElement::toImplWithTypeCheck(isolate, info.Holder());
77     if (!element) {
78         element = V8HTMLEmbedElement::toImplWithTypeCheck(isolate, info.Holder());
79         if (!element) {
80             element = V8HTMLObjectElement::toImplWithTypeCheck(isolate, info.Holder());
81         }
82     }
83     if (element) {
84         if (RefPtr<SharedPersistent<v8::Object> > wrapper = element->pluginWrapper()) {
85             v8::HandleScope handleScope(isolate);
86             npObject = v8ObjectToNPObject(wrapper->newLocal(isolate));
87         } else {
88             npObject = 0;
89         }
90     } else {
91         // The holder object is not a subtype of HTMLPlugInElement, it must be an NPObject which has three
92         // internal fields.
93         if (info.Holder()->InternalFieldCount() != npObjectInternalFieldCount) {
94             V8ThrowException::throwReferenceError("NPMethod called on non-NPObject", info.GetIsolate());
95             return;
96         }
97 
98         npObject = v8ObjectToNPObject(info.Holder());
99     }
100 
101     // Verify that our wrapper wasn't using a NPObject which has already been deleted.
102     if (!npObject || !_NPN_IsAlive(npObject)) {
103         V8ThrowException::throwReferenceError("NPObject deleted", isolate);
104         return;
105     }
106 
107     // Wrap up parameters.
108     int numArgs = info.Length();
109     OwnPtr<NPVariant[]> npArgs = adoptArrayPtr(new NPVariant[numArgs]);
110 
111     for (int i = 0; i < numArgs; i++)
112         convertV8ObjectToNPVariant(info[i], npObject, &npArgs[i], isolate);
113 
114     NPVariant result;
115     VOID_TO_NPVARIANT(result);
116 
117     bool retval = true;
118     switch (functionId) {
119     case InvokeMethod:
120         if (npObject->_class->invoke) {
121             v8::Handle<v8::String> functionName = v8::Handle<v8::String>::Cast(info.Data());
122             NPIdentifier identifier = getStringIdentifier(functionName);
123             retval = npObject->_class->invoke(npObject, identifier, npArgs.get(), numArgs, &result);
124         }
125         break;
126     case InvokeConstruct:
127         if (npObject->_class->construct)
128             retval = npObject->_class->construct(npObject, npArgs.get(), numArgs, &result);
129         break;
130     case InvokeDefault:
131         if (npObject->_class->invokeDefault)
132             retval = npObject->_class->invokeDefault(npObject, npArgs.get(), numArgs, &result);
133         break;
134     default:
135         break;
136     }
137 
138     if (!retval)
139         V8ThrowException::throwGeneralError("Error calling method on NPObject.", isolate);
140 
141     for (int i = 0; i < numArgs; i++)
142         _NPN_ReleaseVariantValue(&npArgs[i]);
143 
144     // Unwrap return values.
145     v8::Handle<v8::Value> returnValue;
146     if (_NPN_IsAlive(npObject))
147         returnValue = convertNPVariantToV8Object(&result, npObject, isolate);
148     _NPN_ReleaseVariantValue(&result);
149 
150     v8SetReturnValue(info, returnValue);
151 }
152 
153 
npObjectMethodHandler(const v8::FunctionCallbackInfo<v8::Value> & info)154 void npObjectMethodHandler(const v8::FunctionCallbackInfo<v8::Value>& info)
155 {
156     return npObjectInvokeImpl(info, InvokeMethod);
157 }
158 
159 
npObjectInvokeDefaultHandler(const v8::FunctionCallbackInfo<v8::Value> & info)160 void npObjectInvokeDefaultHandler(const v8::FunctionCallbackInfo<v8::Value>& info)
161 {
162     if (info.IsConstructCall()) {
163         npObjectInvokeImpl(info, InvokeConstruct);
164         return;
165     }
166 
167     npObjectInvokeImpl(info, InvokeDefault);
168 }
169 
170 class V8TemplateMapTraits : public V8PersistentValueMapTraits<PrivateIdentifier*, v8::FunctionTemplate, true> {
171 public:
172     typedef v8::PersistentValueMap<PrivateIdentifier*, v8::FunctionTemplate, V8TemplateMapTraits> MapType;
173     typedef PrivateIdentifier WeakCallbackDataType;
174 
WeakCallbackParameter(MapType * map,PrivateIdentifier * key,const v8::Local<v8::FunctionTemplate> & value)175     static WeakCallbackDataType* WeakCallbackParameter(MapType* map, PrivateIdentifier* key, const v8::Local<v8::FunctionTemplate>& value)
176     {
177         return key;
178     }
179 
DisposeCallbackData(WeakCallbackDataType * callbackData)180     static void DisposeCallbackData(WeakCallbackDataType* callbackData) { }
181 
182     static MapType* MapFromWeakCallbackData(
183         const v8::WeakCallbackData<v8::FunctionTemplate, WeakCallbackDataType>&);
184 
KeyFromWeakCallbackData(const v8::WeakCallbackData<v8::FunctionTemplate,WeakCallbackDataType> & data)185     static PrivateIdentifier* KeyFromWeakCallbackData(
186         const v8::WeakCallbackData<v8::FunctionTemplate, WeakCallbackDataType>& data)
187     {
188         return data.GetParameter();
189     }
190 
191     // Dispose traits:
Dispose(v8::Isolate * isolate,v8::UniquePersistent<v8::FunctionTemplate> value,PrivateIdentifier * key)192     static void Dispose(v8::Isolate* isolate, v8::UniquePersistent<v8::FunctionTemplate> value, PrivateIdentifier* key) { }
193 };
194 
195 
196 class V8NPTemplateMap {
197 public:
198     // NPIdentifier is PrivateIdentifier*.
199     typedef v8::PersistentValueMap<PrivateIdentifier*, v8::FunctionTemplate, V8TemplateMapTraits> MapType;
200 
get(PrivateIdentifier * key)201     v8::Local<v8::FunctionTemplate> get(PrivateIdentifier* key)
202     {
203         return m_map.Get(key);
204     }
205 
set(PrivateIdentifier * key,v8::Handle<v8::FunctionTemplate> handle)206     void set(PrivateIdentifier* key, v8::Handle<v8::FunctionTemplate> handle)
207     {
208         ASSERT(!m_map.Contains(key));
209         m_map.Set(key, handle);
210     }
211 
sharedInstance(v8::Isolate * isolate)212     static V8NPTemplateMap& sharedInstance(v8::Isolate* isolate)
213     {
214         DEFINE_STATIC_LOCAL(V8NPTemplateMap, map, (isolate));
215         ASSERT(isolate == map.m_map.GetIsolate());
216         return map;
217     }
218 
219     friend class V8TemplateMapTraits;
220 
221 private:
V8NPTemplateMap(v8::Isolate * isolate)222     explicit V8NPTemplateMap(v8::Isolate* isolate)
223         : m_map(isolate)
224     {
225     }
226 
227     MapType m_map;
228 };
229 
MapFromWeakCallbackData(const v8::WeakCallbackData<v8::FunctionTemplate,WeakCallbackDataType> & data)230 V8TemplateMapTraits::MapType* V8TemplateMapTraits::MapFromWeakCallbackData(const v8::WeakCallbackData<v8::FunctionTemplate, WeakCallbackDataType>& data)
231 {
232     return &V8NPTemplateMap::sharedInstance(data.GetIsolate()).m_map;
233 }
234 
235 
npObjectGetProperty(v8::Local<v8::Object> self,NPIdentifier identifier,v8::Local<v8::Value> key,v8::Isolate * isolate)236 static v8::Handle<v8::Value> npObjectGetProperty(v8::Local<v8::Object> self, NPIdentifier identifier, v8::Local<v8::Value> key, v8::Isolate* isolate)
237 {
238     NPObject* npObject = v8ObjectToNPObject(self);
239 
240     // Verify that our wrapper wasn't using a NPObject which
241     // has already been deleted.
242     if (!npObject || !_NPN_IsAlive(npObject))
243         return V8ThrowException::throwReferenceError("NPObject deleted", isolate);
244 
245 
246     if (npObject->_class->hasProperty && npObject->_class->getProperty && npObject->_class->hasProperty(npObject, identifier)) {
247         if (!_NPN_IsAlive(npObject))
248             return V8ThrowException::throwReferenceError("NPObject deleted", isolate);
249 
250         NPVariant result;
251         VOID_TO_NPVARIANT(result);
252         if (!npObject->_class->getProperty(npObject, identifier, &result))
253             return v8Undefined();
254 
255         v8::Handle<v8::Value> returnValue;
256         if (_NPN_IsAlive(npObject))
257             returnValue = convertNPVariantToV8Object(&result, npObject, isolate);
258         _NPN_ReleaseVariantValue(&result);
259         return returnValue;
260 
261     }
262 
263     if (!_NPN_IsAlive(npObject))
264         return V8ThrowException::throwReferenceError("NPObject deleted", isolate);
265 
266     if (key->IsString() && npObject->_class->hasMethod && npObject->_class->hasMethod(npObject, identifier)) {
267         if (!_NPN_IsAlive(npObject))
268             return V8ThrowException::throwReferenceError("NPObject deleted", isolate);
269 
270         PrivateIdentifier* id = static_cast<PrivateIdentifier*>(identifier);
271         v8::Local<v8::FunctionTemplate> functionTemplate = V8NPTemplateMap::sharedInstance(isolate).get(id);
272         // Cache templates using identifier as the key.
273         if (functionTemplate.IsEmpty()) {
274             // Create a new template.
275             functionTemplate = v8::FunctionTemplate::New(isolate);
276             functionTemplate->SetCallHandler(npObjectMethodHandler, key);
277             V8NPTemplateMap::sharedInstance(isolate).set(id, functionTemplate);
278         }
279         v8::Local<v8::Function> v8Function = functionTemplate->GetFunction();
280         v8Function->SetName(v8::Handle<v8::String>::Cast(key));
281         return v8Function;
282     }
283 
284     return v8Undefined();
285 }
286 
npObjectNamedPropertyGetter(v8::Local<v8::String> name,const v8::PropertyCallbackInfo<v8::Value> & info)287 void npObjectNamedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
288 {
289     NPIdentifier identifier = getStringIdentifier(name);
290     v8SetReturnValue(info, npObjectGetProperty(info.Holder(), identifier, name, info.GetIsolate()));
291 }
292 
npObjectIndexedPropertyGetter(uint32_t index,const v8::PropertyCallbackInfo<v8::Value> & info)293 void npObjectIndexedPropertyGetter(uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info)
294 {
295     NPIdentifier identifier = _NPN_GetIntIdentifier(index);
296     v8SetReturnValue(info, npObjectGetProperty(info.Holder(), identifier, v8::Number::New(info.GetIsolate(), index), info.GetIsolate()));
297 }
298 
npObjectGetNamedProperty(v8::Local<v8::Object> self,v8::Local<v8::String> name,const v8::PropertyCallbackInfo<v8::Value> & info)299 void npObjectGetNamedProperty(v8::Local<v8::Object> self, v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
300 {
301     NPIdentifier identifier = getStringIdentifier(name);
302     v8SetReturnValue(info, npObjectGetProperty(self, identifier, name, info.GetIsolate()));
303 }
304 
npObjectGetIndexedProperty(v8::Local<v8::Object> self,uint32_t index,const v8::PropertyCallbackInfo<v8::Value> & info)305 void npObjectGetIndexedProperty(v8::Local<v8::Object> self, uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info)
306 {
307     NPIdentifier identifier = _NPN_GetIntIdentifier(index);
308     v8SetReturnValue(info, npObjectGetProperty(self, identifier, v8::Number::New(info.GetIsolate(), index), info.GetIsolate()));
309 }
310 
npObjectQueryProperty(v8::Local<v8::String> name,const v8::PropertyCallbackInfo<v8::Integer> & info)311 void npObjectQueryProperty(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Integer>& info)
312 {
313     NPIdentifier identifier = getStringIdentifier(name);
314     if (npObjectGetProperty(info.Holder(), identifier, name, info.GetIsolate()).IsEmpty())
315         return;
316     v8SetReturnValueInt(info, 0);
317 }
318 
npObjectSetProperty(v8::Local<v8::Object> self,NPIdentifier identifier,v8::Local<v8::Value> value,v8::Isolate * isolate)319 static v8::Handle<v8::Value> npObjectSetProperty(v8::Local<v8::Object> self, NPIdentifier identifier, v8::Local<v8::Value> value, v8::Isolate* isolate)
320 {
321     NPObject* npObject = v8ObjectToNPObject(self);
322 
323     // Verify that our wrapper wasn't using a NPObject which has already been deleted.
324     if (!npObject || !_NPN_IsAlive(npObject)) {
325         V8ThrowException::throwReferenceError("NPObject deleted", isolate);
326         return value; // Intercepted, but an exception was thrown.
327     }
328 
329     if (npObject->_class->hasProperty && npObject->_class->setProperty && npObject->_class->hasProperty(npObject, identifier)) {
330         if (!_NPN_IsAlive(npObject))
331             return V8ThrowException::throwReferenceError("NPObject deleted", isolate);
332 
333         NPVariant npValue;
334         VOID_TO_NPVARIANT(npValue);
335         convertV8ObjectToNPVariant(value, npObject, &npValue, isolate);
336         bool success = npObject->_class->setProperty(npObject, identifier, &npValue);
337         _NPN_ReleaseVariantValue(&npValue);
338         if (success)
339             return value; // Intercept the call.
340     }
341     return v8Undefined();
342 }
343 
344 
npObjectNamedPropertySetter(v8::Local<v8::String> name,v8::Local<v8::Value> value,const v8::PropertyCallbackInfo<v8::Value> & info)345 void npObjectNamedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
346 {
347     NPIdentifier identifier = getStringIdentifier(name);
348     v8SetReturnValue(info, npObjectSetProperty(info.Holder(), identifier, value, info.GetIsolate()));
349 }
350 
351 
npObjectIndexedPropertySetter(uint32_t index,v8::Local<v8::Value> value,const v8::PropertyCallbackInfo<v8::Value> & info)352 void npObjectIndexedPropertySetter(uint32_t index, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
353 {
354     NPIdentifier identifier = _NPN_GetIntIdentifier(index);
355     v8SetReturnValue(info, npObjectSetProperty(info.Holder(), identifier, value, info.GetIsolate()));
356 }
357 
npObjectSetNamedProperty(v8::Local<v8::Object> self,v8::Local<v8::String> name,v8::Local<v8::Value> value,const v8::PropertyCallbackInfo<v8::Value> & info)358 void npObjectSetNamedProperty(v8::Local<v8::Object> self, v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
359 {
360     NPIdentifier identifier = getStringIdentifier(name);
361     v8SetReturnValue(info, npObjectSetProperty(self, identifier, value, info.GetIsolate()));
362 }
363 
npObjectSetIndexedProperty(v8::Local<v8::Object> self,uint32_t index,v8::Local<v8::Value> value,const v8::PropertyCallbackInfo<v8::Value> & info)364 void npObjectSetIndexedProperty(v8::Local<v8::Object> self, uint32_t index, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
365 {
366     NPIdentifier identifier = _NPN_GetIntIdentifier(index);
367     v8SetReturnValue(info, npObjectSetProperty(self, identifier, value, info.GetIsolate()));
368 }
369 
npObjectPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array> & info,bool namedProperty)370 void npObjectPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info, bool namedProperty)
371 {
372     NPObject* npObject = v8ObjectToNPObject(info.Holder());
373 
374     // Verify that our wrapper wasn't using a NPObject which
375     // has already been deleted.
376     if (!npObject || !_NPN_IsAlive(npObject)) {
377         V8ThrowException::throwReferenceError("NPObject deleted", info.GetIsolate());
378         return;
379     }
380 
381     if (NP_CLASS_STRUCT_VERSION_HAS_ENUM(npObject->_class) && npObject->_class->enumerate) {
382         uint32_t count;
383         NPIdentifier* identifiers;
384         if (npObject->_class->enumerate(npObject, &identifiers, &count)) {
385             uint32_t propertiesCount = 0;
386             for (uint32_t i = 0; i < count; ++i) {
387                 IdentifierRep* identifier = static_cast<IdentifierRep*>(identifiers[i]);
388                 if (namedProperty == identifier->m_isString)
389                     ++propertiesCount;
390             }
391             v8::Handle<v8::Array> properties = v8::Array::New(info.GetIsolate(), propertiesCount);
392             for (uint32_t i = 0, propertyIndex = 0; i < count; ++i) {
393                 IdentifierRep* identifier = static_cast<IdentifierRep*>(identifiers[i]);
394                 if (namedProperty == identifier->m_isString) {
395                     ASSERT(propertyIndex < propertiesCount);
396                     if (namedProperty)
397                         properties->Set(v8::Integer::New(info.GetIsolate(), propertyIndex++), v8AtomicString(info.GetIsolate(), identifier->string()));
398                     else
399                         properties->Set(v8::Integer::New(info.GetIsolate(), propertyIndex++), v8::Integer::New(info.GetIsolate(), identifier->number()));
400                 }
401             }
402 
403             v8SetReturnValue(info, properties);
404             return;
405         }
406     }
407 }
408 
npObjectNamedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array> & info)409 void npObjectNamedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
410 {
411     npObjectPropertyEnumerator(info, true);
412 }
413 
npObjectIndexedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array> & info)414 void npObjectIndexedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
415 {
416     npObjectPropertyEnumerator(info, false);
417 }
418 
staticNPObjectMap()419 static DOMWrapperMap<NPObject>& staticNPObjectMap()
420 {
421     DEFINE_STATIC_LOCAL(DOMWrapperMap<NPObject>, npObjectMap, (v8::Isolate::GetCurrent()));
422     return npObjectMap;
423 }
424 
425 template <>
Dispose(v8::Isolate * isolate,v8::UniquePersistent<v8::Object> value,NPObject * npObject)426 inline void DOMWrapperMap<NPObject>::PersistentValueMapTraits::Dispose(
427     v8::Isolate* isolate,
428     v8::UniquePersistent<v8::Object> value,
429     NPObject* npObject)
430 {
431     ASSERT(npObject);
432     if (_NPN_IsAlive(npObject))
433         _NPN_ReleaseObject(npObject);
434 }
435 
createV8ObjectForNPObject(NPObject * object,NPObject * root,v8::Isolate * isolate)436 v8::Local<v8::Object> createV8ObjectForNPObject(NPObject* object, NPObject* root, v8::Isolate* isolate)
437 {
438     static v8::Eternal<v8::FunctionTemplate> npObjectDesc;
439 
440     ASSERT(isolate->InContext());
441 
442     // If this is a v8 object, just return it.
443     V8NPObject* v8NPObject = npObjectToV8NPObject(object);
444     if (v8NPObject)
445         return v8::Local<v8::Object>::New(isolate, v8NPObject->v8Object);
446 
447     // If we've already wrapped this object, just return it.
448     v8::Handle<v8::Object> wrapper = staticNPObjectMap().newLocal(object, isolate);
449     if (!wrapper.IsEmpty())
450         return wrapper;
451 
452     // FIXME: we should create a Wrapper type as a subclass of JSObject. It has two internal fields, field 0 is the wrapped
453     // pointer, and field 1 is the type. There should be an api function that returns unused type id. The same Wrapper type
454     // can be used by DOM bindings.
455     if (npObjectDesc.IsEmpty()) {
456         v8::Local<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(isolate);
457         templ->InstanceTemplate()->SetInternalFieldCount(npObjectInternalFieldCount);
458         templ->InstanceTemplate()->SetNamedPropertyHandler(npObjectNamedPropertyGetter, npObjectNamedPropertySetter, npObjectQueryProperty, 0, npObjectNamedPropertyEnumerator);
459         templ->InstanceTemplate()->SetIndexedPropertyHandler(npObjectIndexedPropertyGetter, npObjectIndexedPropertySetter, 0, 0, npObjectIndexedPropertyEnumerator);
460         templ->InstanceTemplate()->SetCallAsFunctionHandler(npObjectInvokeDefaultHandler);
461         npObjectDesc.Set(isolate, templ);
462     }
463 
464     // FIXME: Move staticNPObjectMap() to DOMDataStore.
465     // Use V8DOMWrapper::createWrapper() and
466     // V8DOMWrapper::associateObjectWithWrapper()
467     // to create a wrapper object.
468     v8::Handle<v8::Function> v8Function = npObjectDesc.Get(isolate)->GetFunction();
469     v8::Local<v8::Object> value = V8ObjectConstructor::newInstance(isolate, v8Function);
470     if (value.IsEmpty())
471         return value;
472 
473     V8DOMWrapper::setNativeInfo(value, npObjectTypeInfo(), npObjectToScriptWrappableBase(object));
474 
475     // KJS retains the object as part of its wrapper (see Bindings::CInstance).
476     _NPN_RetainObject(object);
477     _NPN_RegisterObject(object, root);
478 
479     staticNPObjectMap().set(object, value, npObjectTypeInfo());
480     ASSERT(V8DOMWrapper::isDOMWrapper(value));
481     return value;
482 }
483 
forgetV8ObjectForNPObject(NPObject * object)484 void forgetV8ObjectForNPObject(NPObject* object)
485 {
486     v8::Isolate* isolate = v8::Isolate::GetCurrent();
487     v8::HandleScope scope(isolate);
488     v8::Handle<v8::Object> wrapper = staticNPObjectMap().newLocal(object, isolate);
489     if (!wrapper.IsEmpty()) {
490         V8DOMWrapper::clearNativeInfo(wrapper, npObjectTypeInfo());
491         staticNPObjectMap().removeAndDispose(object);
492         _NPN_ReleaseObject(object);
493     }
494 }
495 
496 } // namespace blink
497