1 files changed, 351 insertions, 0 deletions
diff --git a/WebCore/bindings/v8/V8NPObject.cpp b/WebCore/bindings/v8/V8NPObject.cpp
new file mode 100644
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+++ b/WebCore/bindings/v8/V8NPObject.cpp
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+/*
+* Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are
+* met:
+*
+*     * Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*     * Redistributions in binary form must reproduce the above
+* copyright notice, this list of conditions and the following disclaimer
+* in the documentation and/or other materials provided with the
+* distribution.
+*     * Neither the name of Google Inc. nor the names of its
+* contributors may be used to endorse or promote products derived from
+* this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "config.h"
+
+#include "V8NPObject.h"
+
+#include "HTMLPlugInElement.h"
+#include "NPV8Object.h"
+#include "V8CustomBinding.h"
+#include "V8DOMMap.h"
+#include "V8HTMLAppletElement.h"
+#include "V8HTMLEmbedElement.h"
+#include "V8HTMLObjectElement.h"
+#include "V8Helpers.h"
+#include "V8NPUtils.h"
+#include "V8Proxy.h"
+#include "npruntime_impl.h"
+#include "npruntime_priv.h"
+#include "wtf/OwnArrayPtr.h"
+
+using namespace WebCore;
+
+enum InvokeFunctionType {
+    InvokeMethod = 1,
+    InvokeConstruct = 2,
+    InvokeDefault = 3
+};
+
+// FIXME: need comments.
+// Params: holder could be HTMLEmbedElement or NPObject
+static v8::Handle<v8::Value> npObjectInvokeImpl(const v8::Arguments& args, InvokeFunctionType functionId)
+{
+    NPObject* npObject;
+
+    // These three types are subtypes of HTMLPlugInElement.
+    if (V8HTMLAppletElement::HasInstance(args.Holder()) || V8HTMLEmbedElement::HasInstance(args.Holder())
+        || V8HTMLObjectElement::HasInstance(args.Holder())) {
+        // The holder object is a subtype of HTMLPlugInElement.
+        HTMLPlugInElement* element = V8DOMWrapper::convertDOMWrapperToNode<HTMLPlugInElement>(args.Holder());
+        ScriptInstance scriptInstance = element->getInstance();
+        if (scriptInstance)
+            npObject = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, scriptInstance->instance());
+        else
+            npObject = 0;
+    } else {
+        // The holder object is not a subtype of HTMLPlugInElement, it must be an NPObject which has three
+        // internal fields.
+        if (args.Holder()->InternalFieldCount() != V8Custom::kNPObjectInternalFieldCount)
+          return throwError("NPMethod called on non-NPObject", V8Proxy::ReferenceError);
+
+        npObject = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, args.Holder());
+    }
+
+    // Verify that our wrapper wasn't using a NPObject which has already been deleted.
+    if (!npObject || !_NPN_IsAlive(npObject))
+        return throwError("NPObject deleted", V8Proxy::ReferenceError);
+
+    // Wrap up parameters.
+    int numArgs = args.Length();
+    OwnArrayPtr<NPVariant> npArgs(new NPVariant[numArgs]);
+
+    for (int i = 0; i < numArgs; i++)
+        convertV8ObjectToNPVariant(args[i], npObject, &npArgs[i]);
+
+    NPVariant result;
+    VOID_TO_NPVARIANT(result);
+
+    switch (functionId) {
+    case InvokeMethod:
+        if (npObject->_class->invoke) {
+            v8::Handle<v8::String> functionName(v8::String::Cast(*args.Data()));
+            NPIdentifier identifier = getStringIdentifier(functionName);
+            npObject->_class->invoke(npObject, identifier, npArgs.get(), numArgs, &result);
+        }
+        break;
+    case InvokeConstruct:
+        if (npObject->_class->construct)
+            npObject->_class->construct(npObject, npArgs.get(), numArgs, &result);
+        break;
+    case InvokeDefault:
+        if (npObject->_class->invokeDefault)
+            npObject->_class->invokeDefault(npObject, npArgs.get(), numArgs, &result);
+        break;
+    default:
+        break;
+    }
+
+    for (int i=0; i < numArgs; i++)
+        _NPN_ReleaseVariantValue(&npArgs[i]);
+
+    // Unwrap return values.
+    v8::Handle<v8::Value> returnValue = convertNPVariantToV8Object(&result, npObject);
+    _NPN_ReleaseVariantValue(&result);
+
+    return returnValue;
+}
+
+
+v8::Handle<v8::Value> npObjectMethodHandler(const v8::Arguments& args)
+{
+    return npObjectInvokeImpl(args, InvokeMethod);
+}
+
+
+v8::Handle<v8::Value> npObjectInvokeDefaultHandler(const v8::Arguments& args)
+{
+    if (args.IsConstructCall())
+        return npObjectInvokeImpl(args, InvokeConstruct);
+    else
+        return npObjectInvokeImpl(args, InvokeDefault);
+}
+
+
+static void weakTemplateCallback(v8::Persistent<v8::Value>, void* parameter);
+
+// NPIdentifier is PrivateIdentifier*.
+static WeakReferenceMap<PrivateIdentifier, v8::FunctionTemplate> staticTemplateMap(&weakTemplateCallback);
+
+static void weakTemplateCallback(v8::Persistent<v8::Value> object, void* parameter)
+{
+    PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(parameter);
+    ASSERT(identifier);
+    ASSERT(staticTemplateMap.contains(identifier));
+
+    staticTemplateMap.forget(identifier);
+}
+
+
+static v8::Handle<v8::Value> npObjectGetProperty(v8::Local<v8::Object> self, NPIdentifier identifier, v8::Local<v8::Value> key)
+{
+    NPObject* npObject = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, self);
+
+    // Verify that our wrapper wasn't using a NPObject which
+    // has already been deleted.
+    if (!npObject || !_NPN_IsAlive(npObject))
+        return throwError("NPObject deleted", V8Proxy::ReferenceError);
+
+
+    if (npObject->_class->hasProperty && npObject->_class->hasProperty(npObject, identifier)
+        && npObject->_class->getProperty) {
+
+        NPVariant result;
+        VOID_TO_NPVARIANT(result);
+        if (!npObject->_class->getProperty(npObject, identifier, &result))
+            return v8::Handle<v8::Value>();
+
+        v8::Handle<v8::Value> returnValue = convertNPVariantToV8Object(&result, npObject);
+        _NPN_ReleaseVariantValue(&result);
+        return returnValue;
+
+    } else if (key->IsString() && npObject->_class->hasMethod && npObject->_class->hasMethod(npObject, identifier)) {
+        PrivateIdentifier* id = static_cast<PrivateIdentifier*>(identifier);
+        v8::Persistent<v8::FunctionTemplate> functionTemplate = staticTemplateMap.get(id);
+        // Cache templates using identifier as the key.
+        if (functionTemplate.IsEmpty()) {
+            // Create a new template.
+            v8::Local<v8::FunctionTemplate> temp = v8::FunctionTemplate::New();
+            temp->SetCallHandler(npObjectMethodHandler, key);
+            functionTemplate = v8::Persistent<v8::FunctionTemplate>::New(temp);
+            staticTemplateMap.set(id, functionTemplate);
+        }
+
+        // FunctionTemplate caches function for each context.
+        v8::Local<v8::Function> v8Function = functionTemplate->GetFunction();
+        v8Function->SetName(v8::Handle<v8::String>::Cast(key));
+        return v8Function;
+    }
+
+    return v8::Handle<v8::Value>();
+}
+
+v8::Handle<v8::Value> npObjectNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    NPIdentifier identifier = getStringIdentifier(name);
+    return npObjectGetProperty(info.Holder(), identifier, name);
+}
+
+v8::Handle<v8::Value> npObjectIndexedPropertyGetter(uint32_t index, const v8::AccessorInfo& info)
+{
+    NPIdentifier identifier = _NPN_GetIntIdentifier(index);
+    return npObjectGetProperty(info.Holder(), identifier, v8::Number::New(index));
+}
+
+v8::Handle<v8::Value> npObjectGetNamedProperty(v8::Local<v8::Object> self, v8::Local<v8::String> name)
+{
+    NPIdentifier identifier = getStringIdentifier(name);
+    return npObjectGetProperty(self, identifier, name);
+}
+
+v8::Handle<v8::Value> npObjectGetIndexedProperty(v8::Local<v8::Object> self, uint32_t index)
+{
+    NPIdentifier identifier = _NPN_GetIntIdentifier(index);
+    return npObjectGetProperty(self, identifier, v8::Number::New(index));
+}
+
+static v8::Handle<v8::Value> npObjectSetProperty(v8::Local<v8::Object> self, NPIdentifier identifier, v8::Local<v8::Value> value)
+{
+    NPObject* npObject = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, self);
+
+    // Verify that our wrapper wasn't using a NPObject which has already been deleted.
+    if (!npObject || !_NPN_IsAlive(npObject)) {
+        throwError("NPObject deleted", V8Proxy::ReferenceError);
+        return value;  // Intercepted, but an exception was thrown.
+    }
+
+    if (npObject->_class->hasProperty && npObject->_class->hasProperty(npObject, identifier)
+        && npObject->_class->setProperty) {
+
+        NPVariant npValue;
+        VOID_TO_NPVARIANT(npValue);
+        convertV8ObjectToNPVariant(value, npObject, &npValue);
+        bool success = npObject->_class->setProperty(npObject, identifier, &npValue);
+        _NPN_ReleaseVariantValue(&npValue);
+        if (success)
+            return value; // Intercept the call.
+    }
+    return notHandledByInterceptor();
+}
+
+
+v8::Handle<v8::Value> npObjectNamedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    NPIdentifier identifier = getStringIdentifier(name);
+    return npObjectSetProperty(info.Holder(), identifier, value);
+}
+
+
+v8::Handle<v8::Value> npObjectIndexedPropertySetter(uint32_t index, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    NPIdentifier identifier = _NPN_GetIntIdentifier(index);
+    return npObjectSetProperty(info.Holder(), identifier, value);
+}
+
+v8::Handle<v8::Value> npObjectSetNamedProperty(v8::Local<v8::Object> self, v8::Local<v8::String> name, v8::Local<v8::Value> value)
+{
+    NPIdentifier identifier = getStringIdentifier(name);
+    return npObjectSetProperty(self, identifier, value);
+}
+
+v8::Handle<v8::Value> npObjectSetIndexedProperty(v8::Local<v8::Object> self, uint32_t index, v8::Local<v8::Value> value)
+{
+    NPIdentifier identifier = _NPN_GetIntIdentifier(index);
+    return npObjectSetProperty(self, identifier, value);
+}
+
+
+static void weakNPObjectCallback(v8::Persistent<v8::Value>, void* parameter);
+
+static DOMWrapperMap<NPObject> staticNPObjectMap(&weakNPObjectCallback);
+
+static void weakNPObjectCallback(v8::Persistent<v8::Value> object, void* parameter)
+{
+    NPObject* npObject = static_cast<NPObject*>(parameter);
+    ASSERT(staticNPObjectMap.contains(npObject));
+    ASSERT(npObject);
+
+    // Must remove from our map before calling _NPN_ReleaseObject(). _NPN_ReleaseObject can call ForgetV8ObjectForNPObject, which
+    // uses the table as well.
+    staticNPObjectMap.forget(npObject);
+
+    if (_NPN_IsAlive(npObject))
+        _NPN_ReleaseObject(npObject);
+}
+
+
+v8::Local<v8::Object> createV8ObjectForNPObject(NPObject* object, NPObject* root)
+{
+    static v8::Persistent<v8::FunctionTemplate> npObjectDesc;
+
+    ASSERT(v8::Context::InContext());
+
+    // If this is a v8 object, just return it.
+    if (object->_class == npScriptObjectClass) {
+        V8NPObject* v8NPObject = reinterpret_cast<V8NPObject*>(object);
+        return v8::Local<v8::Object>::New(v8NPObject->v8Object);
+    }
+
+    // If we've already wrapped this object, just return it.
+    if (staticNPObjectMap.contains(object))
+        return v8::Local<v8::Object>::New(staticNPObjectMap.get(object));
+
+    // FIXME: we should create a Wrapper type as a subclass of JSObject. It has two internal fields, field 0 is the wrapped
+    // pointer, and field 1 is the type. There should be an api function that returns unused type id. The same Wrapper type
+    // can be used by DOM bindings.
+    if (npObjectDesc.IsEmpty()) {
+        npObjectDesc = v8::Persistent<v8::FunctionTemplate>::New(v8::FunctionTemplate::New());
+        npObjectDesc->InstanceTemplate()->SetInternalFieldCount(V8Custom::kNPObjectInternalFieldCount);
+        npObjectDesc->InstanceTemplate()->SetNamedPropertyHandler(npObjectNamedPropertyGetter, npObjectNamedPropertySetter);
+        npObjectDesc->InstanceTemplate()->SetIndexedPropertyHandler(npObjectIndexedPropertyGetter, npObjectIndexedPropertySetter);
+        npObjectDesc->InstanceTemplate()->SetCallAsFunctionHandler(npObjectInvokeDefaultHandler);
+    }
+
+    v8::Handle<v8::Function> v8Function = npObjectDesc->GetFunction();
+    v8::Local<v8::Object> value = SafeAllocation::newInstance(v8Function);
+
+    // If we were unable to allocate the instance, we avoid wrapping and registering the NP object.
+    if (value.IsEmpty())
+        return value;
+
+    wrapNPObject(value, object);
+
+    // KJS retains the object as part of its wrapper (see Bindings::CInstance).
+    _NPN_RetainObject(object);
+
+    _NPN_RegisterObject(object, root);
+
+    // Maintain a weak pointer for v8 so we can cleanup the object.
+    v8::Persistent<v8::Object> weakRef = v8::Persistent<v8::Object>::New(value);
+    staticNPObjectMap.set(object, weakRef);
+
+    return value;
+}
+
+void forgetV8ObjectForNPObject(NPObject* object)
+{
+    if (staticNPObjectMap.contains(object)) {
+        v8::HandleScope scope;
+        v8::Persistent<v8::Object> handle(staticNPObjectMap.get(object));
+        V8DOMWrapper::setDOMWrapper(handle, WebCore::V8ClassIndex::NPOBJECT, 0);
+        staticNPObjectMap.forget(object);
+        _NPN_ReleaseObject(object);
+    }
+}