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 v8DefaultWrapperInternalFieldCount = 2; 43 44 static const uint16_t v8DOMSubtreeClassId = 1; 45 46 typedef v8::Persistent<v8::FunctionTemplate> (*GetTemplateFunction)(); 47 typedef void (*DerefObjectFunction)(void*); 48 typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>); 49 50 // This struct provides a way to store a bunch of information that is helpful when unwrapping 51 // v8 objects. Each v8 bindings class has exactly one static WrapperTypeInfo member, so 52 // comparing pointers is a safe way to determine if types match. 53 struct WrapperTypeInfo { 54 unwrapWrapperTypeInfo55 static WrapperTypeInfo* unwrap(v8::Handle<v8::Value> typeInfoWrapper) 56 { 57 return reinterpret_cast<WrapperTypeInfo*>(v8::External::Unwrap(typeInfoWrapper)); 58 } 59 60 equalsWrapperTypeInfo61 bool equals(const WrapperTypeInfo* that) const 62 { 63 return this == that; 64 } 65 isSubclassWrapperTypeInfo66 bool isSubclass(const WrapperTypeInfo* that) const 67 { 68 for (const WrapperTypeInfo* current = this; current; current = current->parentClass) { 69 if (current == that) 70 return true; 71 } 72 73 return false; 74 } 75 getTemplateWrapperTypeInfo76 v8::Persistent<v8::FunctionTemplate> getTemplate() { return getTemplateFunction(); } 77 derefObjectWrapperTypeInfo78 void derefObject(void* object) 79 { 80 if (derefObjectFunction) 81 derefObjectFunction(object); 82 } 83 toActiveDOMObjectWrapperTypeInfo84 ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object> object) 85 { 86 if (!toActiveDOMObjectFunction) 87 return 0; 88 return toActiveDOMObjectFunction(object); 89 } 90 91 const GetTemplateFunction getTemplateFunction; 92 const DerefObjectFunction derefObjectFunction; 93 const ToActiveDOMObjectFunction toActiveDOMObjectFunction; 94 const WrapperTypeInfo* parentClass; 95 }; 96 } 97 98 #endif // WrapperTypeInfo_h 99