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      1 /*
      2  * Copyright (C) 2010 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WrapperTypeInfo_h
     32 #define WrapperTypeInfo_h
     33 
     34 #include <v8.h>
     35 
     36 namespace WebCore {
     37 
     38     class ActiveDOMObject;
     39 
     40     static const int v8DOMWrapperTypeIndex = 0;
     41     static const int v8DOMWrapperObjectIndex = 1;
     42     static const int v8DOMHiddenReferenceArrayIndex = 2;
     43     static const int v8DefaultWrapperInternalFieldCount = 3;
     44 
     45     static const uint16_t v8DOMSubtreeClassId = 1;
     46 
     47     typedef v8::Persistent<v8::FunctionTemplate> (*GetTemplateFunction)();
     48     typedef void (*DerefObjectFunction)(void*);
     49     typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>);
     50 
     51     // This struct provides a way to store a bunch of information that is helpful when unwrapping
     52     // v8 objects. Each v8 bindings class has exactly one static WrapperTypeInfo member, so
     53     // comparing pointers is a safe way to determine if types match.
     54     struct WrapperTypeInfo {
     55 
     56         static WrapperTypeInfo* unwrap(v8::Handle<v8::Value> typeInfoWrapper)
     57         {
     58             return reinterpret_cast<WrapperTypeInfo*>(v8::External::Unwrap(typeInfoWrapper));
     59         }
     60 
     61 
     62         bool equals(const WrapperTypeInfo* that) const
     63         {
     64             return this == that;
     65         }
     66 
     67         bool isSubclass(const WrapperTypeInfo* that) const
     68         {
     69             for (const WrapperTypeInfo* current = this; current; current = current->parentClass) {
     70                 if (current == that)
     71                     return true;
     72             }
     73 
     74             return false;
     75         }
     76 
     77         v8::Persistent<v8::FunctionTemplate> getTemplate() { return getTemplateFunction(); }
     78 
     79         void derefObject(void* object)
     80         {
     81             if (derefObjectFunction)
     82                 derefObjectFunction(object);
     83         }
     84 
     85         ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object> object)
     86         {
     87             if (!toActiveDOMObjectFunction)
     88                 return 0;
     89             return toActiveDOMObjectFunction(object);
     90         }
     91 
     92         const GetTemplateFunction getTemplateFunction;
     93         const DerefObjectFunction derefObjectFunction;
     94         const ToActiveDOMObjectFunction toActiveDOMObjectFunction;
     95         const WrapperTypeInfo* parentClass;
     96     };
     97 }
     98 
     99 #endif // WrapperTypeInfo_h
    100