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      1 /*
      2  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef JSNodeCustom_h
     27 #define JSNodeCustom_h
     28 
     29 #include "JSDOMBinding.h"
     30 #include <wtf/AlwaysInline.h>
     31 
     32 namespace WebCore {
     33 
     34 class JSNodeOwner : public JSC::WeakHandleOwner {
     35     virtual bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::MarkStack&);
     36     virtual void finalize(JSC::Handle<JSC::Unknown>, void* context);
     37 };
     38 
     39 inline JSC::WeakHandleOwner* wrapperOwner(DOMWrapperWorld*, Node*)
     40 {
     41     DEFINE_STATIC_LOCAL(JSNodeOwner, jsNodeOwner, ());
     42     return &jsNodeOwner;
     43 }
     44 
     45 inline void* wrapperContext(DOMWrapperWorld* world, Node*)
     46 {
     47     return world;
     48 }
     49 
     50 inline JSDOMWrapper* getInlineCachedWrapper(DOMWrapperWorld* world, Node* node)
     51 {
     52     if (!world->isNormal())
     53         return 0;
     54     return node->wrapper();
     55 }
     56 
     57 inline bool setInlineCachedWrapper(DOMWrapperWorld* world, Node* node, JSDOMWrapper* wrapper)
     58 {
     59     if (!world->isNormal())
     60         return false;
     61     ASSERT(!node->wrapper());
     62     node->setWrapper(*world->globalData(), wrapper, wrapperOwner(world, node), wrapperContext(world, node));
     63     return true;
     64 }
     65 
     66 inline bool clearInlineCachedWrapper(DOMWrapperWorld* world, Node* node, JSDOMWrapper* wrapper)
     67 {
     68     if (!world->isNormal())
     69         return false;
     70     ASSERT_UNUSED(wrapper, node->wrapper() == wrapper);
     71     node->clearWrapper();
     72     return true;
     73 }
     74 
     75 JSC::JSValue createWrapper(JSC::ExecState*, JSDOMGlobalObject*, Node*);
     76 
     77 inline JSC::JSValue toJS(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
     78 {
     79     if (!node)
     80         return JSC::jsNull();
     81 
     82     JSNode* wrapper = static_cast<JSNode*>(getCachedWrapper(currentWorld(exec), node));
     83     if (wrapper)
     84         return wrapper;
     85 
     86     return createWrapper(exec, globalObject, node);
     87 }
     88 
     89 static inline Node* root(Node* node)
     90 {
     91     if (node->inDocument())
     92         return node->document();
     93 
     94     while (node->parentNode())
     95         node = node->parentNode();
     96     return node;
     97 }
     98 
     99 }
    100 
    101 #endif // JSDOMNodeCustom_h
    102