Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartDOMWrapper.h

+// Copyright 2011, 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.
+
+#ifndef DartDOMWrapper_h
+#define DartDOMWrapper_h
+
+#include "bindings/common/ScriptValue.h"
+#include "bindings/core/v8/Dictionary.h"
+#include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartExceptionState.h"
+#include "bindings/core/dart/DartUtilities.h"
+#include "bindings/core/v8/SerializedScriptValue.h"
+#include "bindings/dart/DartWebkitClassIds.h"
+#include "core/dom/ExceptionCode.h"
+
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/WTFString.h"
+#include <dart_api.h>
+
+namespace blink {
+
+template<typename HTMLElement>
+class DartCustomElementWrapper;
+class HTMLElement;
+
+template<class BindingsClass>
+struct DartDOMWrapperTraits;
+
+class DartDOMWrapper {
+public:
+    enum NativeFieldIndices {
+        NativeImplementationIndex = 0,
+        NativeTypeIndex = 1,
+        NativeFieldCount
+    };
+
+    template <class BindingsClass>
+    static Dart_WeakPersistentHandle lookupWrapper(DartDOMData* domData, typename BindingsClass::NativeType* domObject)
+    {
+        typedef DartDOMWrapperTraits<BindingsClass> Traits;
+        ASSERT(domObject);
+        ASSERT(domData);
+        if (ScriptWrappable::wrapperCanBeStoredInObject(domObject)) {
+            Dart_WeakPersistentHandle wrapper = (Dart_WeakPersistentHandle)(ScriptWrappable::fromObject(domObject)->getDartWrapper(domData));
+            return wrapper;
+        }
+        return Traits::MapTraits::domMap(domData)->get(domObject);
+    }
+
+    template <class BindingsClass>
+    static Dart_Handle createWrapper(DartDOMData* domData, typename BindingsClass::NativeType* domObject)
+    {
+        return createWrapper<BindingsClass>(
+            domData,
+            domObject,
+            BindingsClass::dartClassId);
+    }
+
+    template <class BindingsClass>
+    static Dart_Handle createWrapper(
+        DartDOMData* domData, typename BindingsClass::NativeType* domObject,
+        intptr_t cid)
+    {
+        ASSERT(domData);
+        ASSERT(domObject);
+        Dart_PersistentHandle type = dartClass(domData, cid);
+        ASSERT(!Dart_IsError(type));
+        intptr_t nativeFields[NativeFieldCount];
+        nativeFields[NativeImplementationIndex] = reinterpret_cast<intptr_t>(domObject);
+        nativeFields[NativeTypeIndex] = cid;
+        Dart_Handle wrapper = Dart_AllocateWithNativeFields(type, NativeFieldCount, nativeFields);
+        if (Dart_IsError(wrapper)) {
+            return wrapper;
+        }
+        associateWrapper<BindingsClass>(domData, domObject, wrapper);
+        return wrapper;
+    }
+
+    template<class BindingsClass>
+    static Dart_Handle vectorToDart(const Vector< RefPtr<typename BindingsClass::NativeType> >& vector)
+    {
+        return DartUtilities::vectorToDart<RefPtr<typename BindingsClass::NativeType>, PassRefPtr<typename BindingsClass::NativeType>, BindingsClass::toDart>(vector);
+    }
+
+    template<class BindingsClass>
+    static Dart_Handle vectorToDart(const HeapVector< Member<typename BindingsClass::NativeType> >& vector)
+    {
+        return DartUtilities::vectorToDart<typename BindingsClass::NativeType, BindingsClass::toDart>(vector);
+    }
+
+    static Dart_Handle vectorToDart(const Vector<float>& vector)
+    {
+        // If this is hot, consider using a Float32List instead.
+        return DartUtilities::vectorToDart<float, double, DartUtilities::doubleToDart>(vector);
+    }
+
+    static Dart_Handle vectorToDart(const Vector<double>& vector)
+    {
+        // If this is hot, consider using a Float32List instead.
+        return DartUtilities::vectorToDart<double, double, DartUtilities::doubleToDart>(vector);
+    }
+
+    static Dart_Handle vectorToDart(const Vector<unsigned>& vector)
+    {
+        // If this is hot, consider using a typed array instead.
+        return DartUtilities::vectorToDart<unsigned, unsigned, DartUtilities::unsignedToDart>(vector);
+    }
+
+    static Dart_Handle vectorToDart(const Vector<String>& vector)
+    {
+        return DartUtilities::vectorToDart<String, const String&, DartUtilities::stringToDart>(vector);
+    }
+
+    template<class T>
+    static Dart_Handle vectorToDartNullable(Nullable<T> vector)
+    {
+        if (vector.isNull())
+            return Dart_Null();
+        return vectorToDart(vector.get());
+    }
+
+    template<class BindingsClass>
+    static Dart_Handle vectorToDartNullable(Nullable< Vector< RefPtr<typename BindingsClass::NativeType> > > vector)
+    {
+        if (vector.isNull())
+            return Dart_Null();
+        return vectorToDart<BindingsClass>(vector.get());
+    }
+
+    template <class BindingsClass>
+    static typename BindingsClass::NativeType* unwrapDartWrapper(
+        DartDOMData* domData, Dart_Handle wrapper, Dart_Handle& exception)
+    {
+        ASSERT(!exception);
+
+        if (Dart_IsNull(wrapper))
+            return 0;
+
+        if (subtypeOf(wrapper, BindingsClass::dartClassId)) {
+            void* nativePointer = readNativePointer(wrapper, NativeImplementationIndex);
+            return static_cast<typename BindingsClass::NativeType*>(nativePointer);
+        }
+        const char* className = DartWebkitClassInfo[BindingsClass::dartClassId].jsName;
+        String message = String("Invalid class: expected instance of ") +
+            className;
+        exception = DartUtilities::stringToDartString(message);
+        return 0;
+    }
+
+    template <class BindingsClass>
+    static typename BindingsClass::NativeType* unwrapDartWrapper(
+        Dart_NativeArguments args, int index, Dart_Handle& exception)
+    {
+        ASSERT(!exception);
+        intptr_t fieldValues[NativeFieldCount];
+        Dart_Handle result = Dart_GetNativeFieldsOfArgument(args, index, NativeFieldCount, fieldValues);
+        if (!Dart_IsError(result)) {
+            void* wrapper = reinterpret_cast<void*>(fieldValues[NativeImplementationIndex]);
+            if (!wrapper) {
+                return 0;
+            }
+            intptr_t cid = fieldValues[NativeTypeIndex];
+            if (subtypeOf(cid, BindingsClass::dartClassId)) {
+                // FIXME(vsm): This is not safe if BindingsClass::NativeType is
+                // not the primary parent.
+                return static_cast<typename BindingsClass::NativeType*>(wrapper);
+            }
+        }
+        const char* className = DartWebkitClassInfo[BindingsClass::dartClassId].jsName;
+        String message = String("Invalid class: expected instance of ") + className;
+        exception = DartUtilities::stringToDartString(message);
+        return 0;
+    }
+
+    static bool subtypeOf(Dart_Handle wrapper, intptr_t basecid)
+    {
+        intptr_t cid = reinterpret_cast<intptr_t>(readNativePointer(wrapper, NativeTypeIndex));
+        return subtypeOf(cid, basecid);
+    }
+
+    static bool subtypeOf(intptr_t cid, intptr_t basecid)
+    {
+        while (cid != -1) {
+            if (cid == basecid) {
+                return true;
+            }
+            ASSERT(cid < NumWebkitClassIds);
+            cid = DartWebkitClassInfo[cid].base_class_id;
+        }
+        return false;
+    }
+
+    template <class BindingsClass>
+    static bool instanceOf(DartDOMData* domData, Dart_Handle wrapper)
+    {
+        Dart_PersistentHandle type = dartClass(domData, BindingsClass::dartClassId);
+
+        bool isInstanceOf = false;
+        Dart_Handle ALLOW_UNUSED result = Dart_ObjectIsType(wrapper, type, &isInstanceOf);
+        ASSERT(!Dart_IsError(result));
+        return isInstanceOf;
+    }
+
+    template <class WebKitClass>
+    static WebKitClass* receiver(Dart_NativeArguments args)
+    {
+        // Type of receiver is ensured by Dart VM runtime, so bypass additional checks.
+        intptr_t value = 0;
+        ASSERT(!NativeImplementationIndex);
+        Dart_Handle ALLOW_UNUSED result = Dart_GetNativeReceiver(args, &value);
+        ASSERT(!Dart_IsError(result));
+        WebKitClass* const recv = reinterpret_cast<WebKitClass*>(value);
+        ASSERT(recv); // Should never return 0.
+        return recv;
+    }
+
+    static EventTarget* receiverToEventTarget(Dart_NativeArguments args)
+    {
+        // If the receiver is an EventTarget, we cannot just do a static cast
+        // from void* to EventTarget due to multiple inheritance.
+        // Instead, we need to invoke toEventTarget on the dynamic type.
+        intptr_t fieldValues[NativeFieldCount];
+        Dart_Handle result = Dart_GetNativeFieldsOfArgument(args, 0, NativeFieldCount, fieldValues);
+        if (!Dart_IsError(result)) {
+            void* wrapper = reinterpret_cast<void*>(fieldValues[NativeImplementationIndex]);
+            if (!wrapper) {
+                ASSERT_NOT_REACHED();
+                return 0;
+            }
+            intptr_t cid = fieldValues[NativeTypeIndex];
+            ASSERT(subtypeOf(cid, EventTargetClassId));
+            return DartWebkitClassInfo[cid].toEventTarget(wrapper);
+        }
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+
+    template <class BindingsClass>
+    static void returnToDart(Dart_NativeArguments args, typename BindingsClass::NativeType* domObject)
+    {
+        if (domObject) {
+            DartDOMData* domData = static_cast<DartDOMData*>(Dart_GetNativeIsolateData(args));
+            Dart_WeakPersistentHandle result = lookupWrapper<BindingsClass>(domData, domObject);
+            if (result)
+                Dart_SetWeakHandleReturnValue(args, result);
+            else
+                Dart_SetReturnValue(args, createWrapper<BindingsClass>(domData, domObject, BindingsClass::dartClassId));
+        }
+    }
+
+    template <class BindingsClass>
+    static void returnToDart(Dart_NativeArguments args, PassRefPtr<typename BindingsClass::NativeType> domObject)
+    {
+        returnToDart<BindingsClass>(args, domObject.get());
+    }
+
+    static int wrapperNativeFieldCount() { return NativeFieldCount; }
+
+private:
+    static Dart_PersistentHandle dartClass(DartDOMData*, intptr_t classIndex);
+
+    static void writeNativePointer(Dart_Handle wrapper, void* pointer, intptr_t cid)
+    {
+        Dart_Handle ALLOW_UNUSED result = Dart_SetNativeInstanceField(
+            wrapper, NativeImplementationIndex, reinterpret_cast<intptr_t>(pointer));
+        ASSERT(!Dart_IsError(result));
+        result = Dart_SetNativeInstanceField(wrapper, NativeTypeIndex, cid);
+        ASSERT(!Dart_IsError(result));
+    }
+
+    static void* readNativePointer(Dart_Handle wrapper, int index)
+    {
+        intptr_t value;
+        Dart_Handle result = Dart_GetNativeInstanceField(wrapper, index, &value);
+        // FIXME: the fact that we return 0 on error rather than asserting is
+        // somewhat of a hack. We currently make this method return 0 because
+        // we reuse this method to verify that objects are actually native
+        // Node objects rather than objects that implement the Node interface.
+        if (Dart_IsError(result))
+            return 0;
+        return reinterpret_cast<void*>(value);
+    }
+
+    template <class BindingsClass>
+    static void wrapperWeakCallback(void* isolateCallbackData, Dart_WeakPersistentHandle wrapper, void* blinkHandle)
+    {
+        typedef DartDOMWrapperTraits<BindingsClass> Traits;
+        DartDOMData* domData = reinterpret_cast<DartDOMData*>(isolateCallbackData);
+        typename BindingsClass::NativeType* domObject = Traits::GCTraits::read(blinkHandle);
+
+        Dart_WeakPersistentHandle currentWrapper = 0;
+        if (ScriptWrappable::wrapperCanBeStoredInObject(domObject)) {
+            currentWrapper = (Dart_WeakPersistentHandle)(ScriptWrappable::fromObject(domObject)->getDartWrapper(domData));
+        } else {
+            currentWrapper = Traits::MapTraits::domMap(domData)->get(domObject);
+        }
+
+        // This could be an old wrapper which has been replaced with a custom element.
+        if (currentWrapper != wrapper) {
+#ifdef DEBUG
+            DartApiScope scope;
+            ASSERT(!Dart_IdentityEquals(Dart_HandleFromWeakPersistent(currentWrapper), Dart_HandleFromWeakPersistent(wrapper)));
+#endif
+            return;
+        }
+
+        if (currentWrapper) {
+            if (ScriptWrappable::wrapperCanBeStoredInObject(domObject)) {
+                ScriptWrappable::fromObject(domObject)->clearDartWrapper(domData);
+            } else {
+                Traits::MapTraits::domMap(domData)->remove(domObject);
+            }
+        }
+        Traits::GCTraits::deref(blinkHandle);
+    }
+
+    template <class BindingsClass>
+    static void associateWrapper(
+        DartDOMData* domData, typename BindingsClass::NativeType* domObject, Dart_Handle newInstance)
+    {
+        typedef DartDOMWrapperTraits<BindingsClass> Traits;
+        void* blinkHandle = Traits::GCTraits::ref(domObject);
+        // This is only used to inform the Dart garbage collector on how much external memory
+        // is kept alive.
+        intptr_t externalAllocationSize = sizeof(*domObject);
+
+        Dart_WeakPersistentHandle wrapper = Dart_NewPrologueWeakPersistentHandle(
+            newInstance, blinkHandle, externalAllocationSize, &wrapperWeakCallback<BindingsClass>);
+        if (ScriptWrappable::wrapperCanBeStoredInObject(domObject)) {
+            ScriptWrappable::fromObject(domObject)->setDartWrapper(domData, wrapper);
+        } else {
+            Traits::MapTraits::domMap(domData)->set(domObject, wrapper);
+        }
+    }
+
+    template <class BindingsClass>
+    static void disassociateWrapper(
+        DartDOMData* domData, typename BindingsClass::NativeType* domObject, Dart_Handle oldInstance)
+    {
+        typedef DartDOMWrapperTraits<BindingsClass> Traits;
+
+        if (ScriptWrappable::wrapperCanBeStoredInObject(domObject)) {
+#ifdef DEBUG
+            Dart_WeakPersistentHandle wrapper = (Dart_WeakPersistentHandle)(ScriptWrappable::fromObject(domObject)->getDartWrapper(domData));
+            ASSERT(Dart_IdentityEquals(Dart_HandleFromWeakPersistent(wrapper), oldInstance));
+#endif
+            ScriptWrappable::fromObject(domObject)->clearDartWrapper(domData);
+        } else {
+#ifdef DEBUG
+            Dart_WeakPersistentHandle wrapper = Traits::MapTraits::domMap(domData)->get(domObject);
+            ASSERT(Dart_IdentityEquals(Dart_HandleFromWeakPersistent(wrapper), oldInstance));
+#endif
+            Traits::MapTraits::domMap(domData)->remove(domObject);
+        }
+    }
+
+    friend class DartCustomElementConstructorBuilder;
+    friend class DartCustomElementWrapper<HTMLElement>;
+    friend class DartUtilities;
+};
+
+struct DartDOMWrapperMapTraits {
+    static DartDOMObjectMap* domMap(DartDOMData* domData) { return domData->objectMap(); }
+};
+
+template<class BindingsClass, bool isGarbageCollected>
+struct DartDOMWrapperGarbageCollectedTraits { };
+
+template<class BindingsClass>
+struct DartDOMWrapperGarbageCollectedTraits<BindingsClass, false> {
+    static void* ref(typename BindingsClass::NativeType* domObject)
+    {
+        domObject->ref();
+        return domObject;
+    }
+
+    static void deref(void* blinkHandle)
+    {
+        typename BindingsClass::NativeType* domObject = read(blinkHandle);
+        domObject->deref();
+    }
+
+    static typename BindingsClass::NativeType* read(void* blinkHandle)
+    {
+        return static_cast<typename BindingsClass::NativeType*>(blinkHandle);
+    }
+};
+
+template<class BindingsClass>
+struct DartDOMWrapperGarbageCollectedTraits<BindingsClass, true> {
+    static void* ref(typename BindingsClass::NativeType* domObject)
+    {
+        return new Persistent<typename BindingsClass::NativeType>(domObject);
+    }
+
+    static void deref(void* blinkHandle)
+    {
+        Persistent<typename BindingsClass::NativeType>* handle = static_cast<Persistent<typename BindingsClass::NativeType>*>(blinkHandle);
+        delete handle;
+    }
+
+    static typename BindingsClass::NativeType* read(void* blinkHandle)
+    {
+        Persistent<typename BindingsClass::NativeType>* handle = static_cast<Persistent<typename BindingsClass::NativeType>*>(blinkHandle);
+        return handle->get();
+    }
+};
+
+template<class BindingsClass>
+struct DartDOMWrapperTraits {
+    typedef DartDOMWrapperMapTraits MapTraits;
+    typedef DartDOMWrapperGarbageCollectedTraits<BindingsClass, BindingsClass::isGarbageCollected> GCTraits;
+};
+
+struct DartMessagePort;
+
+template<>
+struct DartDOMWrapperTraits<DartMessagePort> {
+    struct MessagePortMapTraits {
+        static DartMessagePortMap* domMap(DartDOMData* domData) { return domData->messagePortMap(); }
+    };
+    typedef MessagePortMapTraits MapTraits;
+    typedef DartDOMWrapperGarbageCollectedTraits<DartMessagePort, false> GCTraits;
+};
+
+}
+
+#endif // DartDOMWrapper_h