Move CrossThreadCopier.cpp/.h to platform/

Source/core/platform/CrossThreadCopier.h

-/*
- * Copyright (C) 2009, 2010 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 CrossThreadCopier_h
-#define CrossThreadCopier_h
-
-#include "wtf/Assertions.h"
-#include "wtf/Forward.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
-#include "wtf/ThreadSafeRefCounted.h"
-#include "wtf/TypeTraits.h"
-
-namespace WebCore {
-
-    class IntRect;
-    class IntSize;
-    class KURL;
-    class ResourceError;
-    class ResourceRequest;
-    class ResourceResponse;
-    struct CrossThreadResourceResponseData;
-    struct CrossThreadResourceRequestData;
-    struct ThreadableLoaderOptions;
-
-    template<typename T> struct CrossThreadCopierPassThrough {
-        typedef T Type;
-        static Type copy(const T& parameter)
-        {
-            return parameter;
-        }
-    };
-
-    template<bool isConvertibleToInteger, bool isThreadSafeRefCounted, typename T> struct CrossThreadCopierBase;
-
-    // Integers get passed through without any changes.
-    template<typename T> struct CrossThreadCopierBase<true, false, T> : public CrossThreadCopierPassThrough<T> {
-    };
-
-    // To allow a type to be passed across threads using its copy constructor, add a forward declaration of the type and
-    // a CopyThreadCopierBase<false, false, TypeName> : public CrossThreadCopierPassThrough<TypeName> { }; to this file.
-    template<> struct CrossThreadCopierBase<false, false, ThreadableLoaderOptions> : public CrossThreadCopierPassThrough<ThreadableLoaderOptions> {
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, IntRect> : public CrossThreadCopierPassThrough<IntRect> {
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, IntSize> : public CrossThreadCopierPassThrough<IntSize> {
-    };
-
-    // Custom copy methods.
-    template<typename T> struct CrossThreadCopierBase<false, true, T> {
-        typedef typename WTF::RemoveTemplate<T, RefPtr>::Type TypeWithoutRefPtr;
-        typedef typename WTF::RemoveTemplate<TypeWithoutRefPtr, PassRefPtr>::Type TypeWithoutPassRefPtr;
-        typedef typename WTF::RemovePointer<TypeWithoutPassRefPtr>::Type RefCountedType;
-
-        // Verify that only one of the above did a change.
-        COMPILE_ASSERT((WTF::IsSameType<RefPtr<RefCountedType>, T>::value
-                        || WTF::IsSameType<PassRefPtr<RefCountedType>, T>::value
-                        || WTF::IsSameType<RefCountedType*, T>::value),
-                       OnlyAllowOneTypeModification);
-
-        typedef PassRefPtr<RefCountedType> Type;
-        static Type copy(const T& refPtr)
-        {
-            return refPtr;
-        }
-    };
-
-    template<typename T> struct CrossThreadCopierBase<false, false, PassOwnPtr<T> > {
-        typedef PassOwnPtr<T> Type;
-        static Type copy(Type ownPtr)
-        {
-            return ownPtr;
-        }
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, KURL> {
-        typedef KURL Type;
-        static Type copy(const KURL&);
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, String> {
-        typedef String Type;
-        static Type copy(const String&);
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, ResourceError> {
-        typedef ResourceError Type;
-        static Type copy(const ResourceError&);
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, ResourceRequest> {
-        typedef PassOwnPtr<CrossThreadResourceRequestData> Type;
-        static Type copy(const ResourceRequest&);
-    };
-
-    template<> struct CrossThreadCopierBase<false, false, ResourceResponse> {
-        typedef PassOwnPtr<CrossThreadResourceResponseData> Type;
-        static Type copy(const ResourceResponse&);
-    };
-
-    template<typename T> struct CrossThreadCopier : public CrossThreadCopierBase<WTF::IsConvertibleToInteger<T>::value,
-                                                                                 WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, RefPtr>::Type, ThreadSafeRefCounted>::value
-                                                                                     || WTF::IsSubclassOfTemplate<typename WTF::RemovePointer<T>::Type, ThreadSafeRefCounted>::value
-                                                                                     || WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, PassRefPtr>::Type, ThreadSafeRefCounted>::value,
-                                                                                 T> {
-    };
-
-    template<typename T> struct AllowCrossThreadAccessWrapper {
-    public:
-        explicit AllowCrossThreadAccessWrapper(T* value) : m_value(value) { }
-        T* value() const { return m_value; }
-    private:
-        T* m_value;
-    };
-
-    template<typename T> struct CrossThreadCopierBase<false, false, AllowCrossThreadAccessWrapper<T> > {
-        typedef T* Type;
-        static Type copy(const AllowCrossThreadAccessWrapper<T>& wrapper) { return wrapper.value(); }
-    };
-
-    template<typename T> AllowCrossThreadAccessWrapper<T> AllowCrossThreadAccess(T* value)
-    {
-        return AllowCrossThreadAccessWrapper<T>(value);
-    }
-
-    // FIXME: Move to a different header file. AllowAccessLater is for cross-thread access
-    // that is not cross-thread (tasks posted to a queue guaranteed to run on the same thread).
-    template<typename T> struct AllowAccessLaterWrapper {
-    public:
-        explicit AllowAccessLaterWrapper(T* value) : m_value(value) { }
-        T* value() const { return m_value; }
-    private:
-        T* m_value;
-    };
-
-    template<typename T> struct CrossThreadCopierBase<false, false, AllowAccessLaterWrapper<T> > {
-        typedef T* Type;
-        static Type copy(const AllowAccessLaterWrapper<T>& wrapper) { return wrapper.value(); }
-    };
-
-    template<typename T> AllowAccessLaterWrapper<T> AllowAccessLater(T* value)
-    {
-        return AllowAccessLaterWrapper<T>(value);
-    }
-
-
-} // namespace WebCore
-
-#endif // CrossThreadCopier_h