1 files changed, 77 insertions, 7 deletions

diff --git a/Source/WebCore/bindings/js/JSDOMWrapper.h b/Source/WebCore/bindings/js/JSDOMWrapper.h
index 026dcd931..11d439ce2 100644
--- a/Source/WebCore/bindings/js/JSDOMWrapper.h
+++ b/Source/WebCore/bindings/js/JSDOMWrapper.h
@@ -19,31 +19,101 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef JSDOMWrapper_h
-#define JSDOMWrapper_h
+#pragma once
 
 #include "JSDOMGlobalObject.h"
+#include "NodeConstants.h"
 #include <runtime/JSDestructibleObject.h>
 
 namespace WebCore {
 
+class JSDOMWindow;
 class ScriptExecutionContext;
 
-class JSDOMWrapper : public JSC::JSDestructibleObject {
+// 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:
-    JSDOMWrapper(JSC::Structure* structure, JSC::JSGlobalObject* globalObject) 
-        : JSDestructibleObject(globalObject->vm(), structure)
+    JSDOMObject(JSC::Structure* structure, JSC::JSGlobalObject& globalObject)
+        : Base(globalObject.vm(), structure)
     {
         ASSERT(scriptExecutionContext());
     }
 };
 
-} // namespace WebCore
+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;
+};
 
-#endif // JSDOMWrapper_h
+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