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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "JSDOMGlobalObject.h"
#include "NodeConstants.h"
#include <runtime/JSDestructibleObject.h>
namespace WebCore {
class JSDOMWindow;
class ScriptExecutionContext;
// JSC allows us to extend JSType. If the highest bit is set, we can add any Object types and they are
// recognized as OtherObj in JSC. And we encode Node type into JSType if the given JSType is subclass of Node.
// offset | 7 | 6 | 5 4 | 3 2 1 0 |
// value | 1 | 0 | Non-node DOM types |
// If the given JSType is a subclass of Node, the format is the following.
// offset | 7 | 6 | 5 4 | 3 2 1 0 |
// value | 1 | 1 | Kind | NodeType |
static const uint8_t JSNodeTypeMask = 0b00001111;
static const uint8_t JSDOMWrapperType = 0b10000000;
static const uint8_t JSEventType = 0b10000001;
static const uint8_t JSNodeType = 0b11000000;
static const uint8_t JSTextNodeType = JSNodeType | NodeConstants::TEXT_NODE;
static const uint8_t JSProcessingInstructionNodeType = JSNodeType | NodeConstants::PROCESSING_INSTRUCTION_NODE;
static const uint8_t JSDocumentTypeNodeType = JSNodeType | NodeConstants::DOCUMENT_TYPE_NODE;
static const uint8_t JSDocumentFragmentNodeType = JSNodeType | NodeConstants::DOCUMENT_FRAGMENT_NODE;
static const uint8_t JSDocumentWrapperType = JSNodeType | NodeConstants::DOCUMENT_NODE;
static const uint8_t JSCommentNodeType = JSNodeType | NodeConstants::COMMENT_NODE;
static const uint8_t JSCDATASectionNodeType = JSNodeType | NodeConstants::CDATA_SECTION_NODE;
static const uint8_t JSAttrNodeType = JSNodeType | NodeConstants::ATTRIBUTE_NODE;
static const uint8_t JSElementType = 0b11010000 | NodeConstants::ELEMENT_NODE;
static_assert(JSDOMWrapperType > JSC::LastJSCObjectType, "JSC::JSType offers the highest bit.");
static_assert(NodeConstants::LastNodeType <= JSNodeTypeMask, "NodeType should be represented in 4bit.");
class JSDOMObject : public JSC::JSDestructibleObject {
public:
typedef JSC::JSDestructibleObject Base;
static constexpr bool isDOMWrapper = false;
JSDOMGlobalObject* globalObject() const { return JSC::jsCast<JSDOMGlobalObject*>(JSC::JSNonFinalObject::globalObject()); }
ScriptExecutionContext* scriptExecutionContext() const { return globalObject()->scriptExecutionContext(); }
JSDOMWindow& domWindow() const;
protected:
JSDOMObject(JSC::Structure* structure, JSC::JSGlobalObject& globalObject)
: Base(globalObject.vm(), structure)
{
ASSERT(scriptExecutionContext());
}
};
WEBCORE_EXPORT JSC::Subspace* outputConstraintSubspaceFor(JSC::VM&);
WEBCORE_EXPORT JSC::Subspace* globalObjectOutputConstraintSubspaceFor(JSC::VM&);
template<typename ImplementationClass> class JSDOMWrapper : public JSDOMObject {
public:
typedef JSDOMObject Base;
typedef ImplementationClass DOMWrapped;
static constexpr bool isDOMWrapper = true;
ImplementationClass& wrapped() const { return m_wrapped; }
static ptrdiff_t offsetOfWrapped() { return OBJECT_OFFSETOF(JSDOMWrapper<ImplementationClass>, m_wrapped); }
protected:
JSDOMWrapper(JSC::Structure* structure, JSC::JSGlobalObject& globalObject, Ref<ImplementationClass>&& impl)
: Base(structure, globalObject)
, m_wrapped(WTFMove(impl)) { }
private:
Ref<ImplementationClass> m_wrapped;
};
template<typename ImplementationClass> struct JSDOMWrapperConverterTraits;
template<typename JSClass, typename Enable = void>
struct JSDOMObjectInspector {
public:
static constexpr bool isSimpleWrapper = false;
static constexpr bool isComplexWrapper = false;
static constexpr bool isBuiltin = true;
};
template<typename JSClass>
struct JSDOMObjectInspector<JSClass, typename std::enable_if<JSClass::isDOMWrapper>::type> {
private:
template<typename T> static constexpr auto test(int) -> decltype(T::create(), bool()) { return true; }
template<typename T> static constexpr bool test(...) { return false; }
public:
static constexpr bool isSimpleWrapper = test<typename JSClass::DOMWrapped>(0);
static constexpr bool isComplexWrapper = !isSimpleWrapper;
static constexpr bool isBuiltin = false;
};
} // namespace WebCore
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