src/third_party/WebKit/Source/bindings/v8/DOMDataStore.h

   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
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  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  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 DOMDataStore_h
  32 #define DOMDataStore_h
  33
  34 #include "bindings/v8/DOMWrapperMap.h"
  35 #include "bindings/v8/DOMWrapperWorld.h"
  36 #include "bindings/v8/ScriptWrappable.h"
  37 #include "bindings/v8/WrapperTypeInfo.h"
  38 #include <v8.h>
  39 #include "wtf/Noncopyable.h"
  40 #include "wtf/StdLibExtras.h"
  41
  42 namespace WebCore {
  43
  44 class Node;
  45
  46 class DOMDataStore {
  47     WTF_MAKE_NONCOPYABLE(DOMDataStore);
  48 public:
  49     explicit DOMDataStore(WrapperWorldType);
  50     ~DOMDataStore();
  51
  52     static DOMDataStore& current(v8::Isolate*);
  53
  54     template<typename V8T, typename T, typename Wrappable>
  55     static bool setReturnValueFromWrapperFast(v8::ReturnValue<v8::Value> returnValue, T* object, v8::Local<v8::Object> holder, Wrappable* wrappable)
  56     {
  57         // What we'd really like to check here is whether we're in the
  58         // main world or in an isolated world. The fastest way to do that
  59         // is to check that there is no isolated world and the 'object'
  60         // is an object that can exist in the main world. The second fastest
  61         // way is to check whether the wrappable's wrapper is the same as
  62         // the holder.
  63         if ((!DOMWrapperWorld::isolatedWorldsExist() && !canExistInWorker(object)) || holderContainsWrapper(holder, wrappable)) {
  64             if (ScriptWrappable::wrapperCanBeStoredInObject(object))
  65                 return ScriptWrappable::setReturnValueWithSecurityCheck<V8T>(returnValue, object);
  66             return mainWorldStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
  67         }
  68         return current(returnValue.GetIsolate()).template setReturnValueFrom<V8T>(returnValue, object);
  69     }
  70
  71     template<typename V8T, typename T>
  72     static bool setReturnValueFromWrapper(v8::ReturnValue<v8::Value> returnValue, T* object)
  73     {
  74         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
  75             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist()))
  76                 return ScriptWrappable::setReturnValueWithSecurityCheck<V8T>(returnValue, object);
  77         }
  78         return current(returnValue.GetIsolate()).template setReturnValueFrom<V8T>(returnValue, object);
  79     }
  80
  81     template<typename V8T, typename T>
  82     static bool setReturnValueFromWrapperForMainWorld(v8::ReturnValue<v8::Value> returnValue, T* object)
  83     {
  84         if (ScriptWrappable::wrapperCanBeStoredInObject(object))
  85             return ScriptWrappable::setReturnValue(returnValue, object);
  86         return mainWorldStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
  87     }
  88
  89     template<typename V8T, typename T>
  90     static v8::Handle<v8::Object> getWrapper(T* object, v8::Isolate* isolate)
  91     {
  92         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
  93             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
  94                 v8::Handle<v8::Object> result = ScriptWrappable::getUnsafeWrapperFromObject(object).newLocal(isolate);
  95                 // Security: always guard against malicious tampering.
  96                 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(result.IsEmpty() || result->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex) == V8T::toInternalPointer(object));
  97                 return result;
  98             }
  99         }
 100         return current(isolate).template get<V8T>(object, isolate);
 101     }
 102
 103     template<typename V8T, typename T>
 104     static void setWrapperReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
 105     {
 106         if (ScriptWrappable::wrapperCanBeStoredInObject(child) && !canExistInWorker(child)) {
 107             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
 108                 UnsafePersistent<v8::Object> unsafePersistent = ScriptWrappable::getUnsafeWrapperFromObject(child);
 109                 // Security: always guard against malicious tampering.
 110                 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(unsafePersistent.isEmpty() || unsafePersistent.value()->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex) == V8T::toInternalPointer(child));
 111                 unsafePersistent.setReferenceFrom(parent, isolate);
 112             }
 113         }
 114         current(isolate).template setReference<V8T>(parent, child, isolate);
 115     }
 116
 117     template<typename V8T, typename T>
 118     static void setWrapper(T* object, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperConfiguration& configuration)
 119     {
 120         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
 121             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
 122                 ScriptWrappable::setWrapperInObject(object, wrapper, isolate, configuration);
 123                 return;
 124             }
 125         }
 126         return current(isolate).template set<V8T>(object, wrapper, isolate, configuration);
 127     }
 128
 129     template<typename V8T, typename T>
 130     static bool containsWrapper(T* object, v8::Isolate* isolate)
 131     {
 132         return current(isolate).template containsWrapper<V8T>(object);
 133     }
 134
 135     template<typename V8T, typename T>
 136     inline v8::Handle<v8::Object> get(T* object, v8::Isolate* isolate)
 137     {
 138         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
 139             return ScriptWrappable::getUnsafeWrapperFromObject(object).newLocal(isolate);
 140         return m_wrapperMap.newLocal(V8T::toInternalPointer(object), isolate);
 141     }
 142
 143     template<typename V8T, typename T>
 144     inline void setReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
 145     {
 146         if (ScriptWrappable::wrapperCanBeStoredInObject(child) && m_type == MainWorld) {
 147             ScriptWrappable::getUnsafeWrapperFromObject(child).setReferenceFrom(parent, isolate);
 148             return;
 149         }
 150         m_wrapperMap.setReference(parent, V8T::toInternalPointer(child), isolate);
 151     }
 152
 153     template<typename V8T, typename T>
 154     inline bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, T* object)
 155     {
 156         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
 157             return ScriptWrappable::setReturnValue(returnValue, object);
 158         return m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
 159     }
 160
 161     template<typename V8T, typename T>
 162     inline bool containsWrapper(T* object)
 163     {
 164         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
 165             return !ScriptWrappable::getUnsafeWrapperFromObject(object).isEmpty();
 166         return m_wrapperMap.containsKey(V8T::toInternalPointer(object));
 167     }
 168
 169 private:
 170     template<typename V8T, typename T>
 171     inline void set(T* object, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperConfiguration& configuration)
 172     {
 173         ASSERT(!!object);
 174         ASSERT(!wrapper.IsEmpty());
 175         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld) {
 176             ScriptWrappable::setWrapperInObject(object, wrapper, isolate, configuration);
 177             return;
 178         }
 179         m_wrapperMap.set(V8T::toInternalPointer(object), wrapper, configuration);
 180     }
 181
 182     static DOMDataStore& mainWorldStore();
 183
 184     static bool canExistInWorker(void*) { return true; }
 185     static bool canExistInWorker(Node*) { return false; }
 186
 187     static bool holderContainsWrapper(v8::Local<v8::Object>, void*)
 188     {
 189         return false;
 190     }
 191
 192     static bool holderContainsWrapper(v8::Local<v8::Object> holder, ScriptWrappable* wrappable)
 193     {
 194         // Verify our assumptions about the main world.
 195         UnsafePersistent<v8::Object> unsafePersistent = wrappable->unsafePersistent();
 196         ASSERT(unsafePersistent.isEmpty() || !(holder == *unsafePersistent.persistent()) || current(v8::Isolate::GetCurrent()).m_type == MainWorld);
 197         return holder == *unsafePersistent.persistent();
 198     }
 199
 200     WrapperWorldType m_type;
 201     DOMWrapperMap<void> m_wrapperMap;
 202 };
 203
 204 } // namespace WebCore
 205
 206 #endif // DOMDataStore_h