1 /* 2 * Copyright (C) 2009 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 V8DOMWrapper_h 32 #define V8DOMWrapper_h 33 34 #include "bindings/v8/DOMDataStore.h" 35 #include <v8.h> 36 #include "wtf/PassRefPtr.h" 37 #include "wtf/text/AtomicString.h" 38 39 namespace WebCore { 40 41 struct WrapperTypeInfo; 42 43 class V8DOMWrapper { 44 public: 45 #ifndef NDEBUG 46 // Checks if a v8 value can be a DOM wrapper 47 static bool maybeDOMWrapper(v8::Handle<v8::Value>); 48 #endif 49 50 static v8::Local<v8::Object> createWrapper(v8::Handle<v8::Object> creationContext, const WrapperTypeInfo*, void*, v8::Isolate*); 51 52 template<typename V8T, typename T> 53 static inline v8::Handle<v8::Object> associateObjectWithWrapper(PassRefPtr<T>, const WrapperTypeInfo*, v8::Handle<v8::Object>, v8::Isolate*, WrapperConfiguration::Lifetime); 54 static inline void setNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*, void*); 55 static inline void clearNativeInfo(v8::Handle<v8::Object>, const WrapperTypeInfo*); 56 57 static bool isDOMWrapper(v8::Handle<v8::Value>); 58 static bool isWrapperOfType(v8::Handle<v8::Value>, const WrapperTypeInfo*); 59 }; 60 61 inline void V8DOMWrapper::setNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* type, void* object) 62 { 63 ASSERT(wrapper->InternalFieldCount() >= 2); 64 ASSERT(object); 65 ASSERT(type); 66 wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, object); 67 wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(type)); 68 } 69 70 inline void V8DOMWrapper::clearNativeInfo(v8::Handle<v8::Object> wrapper, const WrapperTypeInfo* type) 71 { 72 ASSERT(wrapper->InternalFieldCount() >= 2); 73 ASSERT(type); 74 wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(type)); 75 wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, 0); 76 } 77 78 template<typename V8T, typename T> 79 inline v8::Handle<v8::Object> V8DOMWrapper::associateObjectWithWrapper(PassRefPtr<T> object, const WrapperTypeInfo* type, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, WrapperConfiguration::Lifetime lifetime) 80 { 81 setNativeInfo(wrapper, type, V8T::toInternalPointer(object.get())); 82 ASSERT(maybeDOMWrapper(wrapper)); 83 WrapperConfiguration configuration = buildWrapperConfiguration(object.get(), lifetime); 84 DOMDataStore::setWrapper<V8T>(object.leakRef(), wrapper, isolate, configuration); 85 return wrapper; 86 } 87 88 class V8WrapperInstantiationScope { 89 public: 90 V8WrapperInstantiationScope(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate) 91 : m_didEnterContext(false) 92 , m_context(isolate->GetCurrentContext()) 93 { 94 // FIXME: Remove all empty creationContexts from caller sites. 95 // If a creationContext is empty, we will end up creating a new object 96 // in the context currently entered. This is wrong. 97 if (creationContext.IsEmpty()) 98 return; 99 v8::Handle<v8::Context> contextForWrapper = creationContext->CreationContext(); 100 // For performance, we enter the context only if the currently running context 101 // is different from the context that we are about to enter. 102 if (contextForWrapper == m_context) 103 return; 104 m_context = v8::Local<v8::Context>::New(isolate, contextForWrapper); 105 m_didEnterContext = true; 106 m_context->Enter(); 107 } 108 109 ~V8WrapperInstantiationScope() 110 { 111 if (!m_didEnterContext) 112 return; 113 m_context->Exit(); 114 } 115 116 v8::Handle<v8::Context> context() const { return m_context; } 117 118 private: 119 bool m_didEnterContext; 120 v8::Handle<v8::Context> m_context; 121 }; 122 123 } 124 125 #endif // V8DOMWrapper_h 126
