| /* |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef WrapperTypeInfo_h |
| #define WrapperTypeInfo_h |
| |
| #include "gin/public/wrapper_info.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/Assertions.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| class ActiveDOMObject; |
| class EventTarget; |
| class ScriptWrappableBase; |
| |
| static const int v8DOMWrapperTypeIndex = static_cast<int>(gin::kWrapperInfoIndex); |
| static const int v8DOMWrapperObjectIndex = static_cast<int>(gin::kEncodedValueIndex); |
| static const int v8DefaultWrapperInternalFieldCount = static_cast<int>(gin::kNumberOfInternalFields); |
| static const int v8PrototypeTypeIndex = 0; |
| static const int v8PrototypeInternalFieldcount = 1; |
| |
| typedef v8::Handle<v8::FunctionTemplate> (*DomTemplateFunction)(v8::Isolate*); |
| typedef void (*RefObjectFunction)(ScriptWrappableBase*); |
| typedef void (*DerefObjectFunction)(ScriptWrappableBase*); |
| typedef void (*TraceFunction)(Visitor*, ScriptWrappableBase*); |
| typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>); |
| typedef EventTarget* (*ToEventTargetFunction)(v8::Handle<v8::Object>); |
| typedef void (*ResolveWrapperReachabilityFunction)(v8::Isolate*, ScriptWrappableBase*, const v8::Persistent<v8::Object>&); |
| typedef void (*InstallConditionallyEnabledMethodsFunction)(v8::Handle<v8::Object>, v8::Isolate*); |
| typedef void (*InstallConditionallyEnabledPropertiesFunction)(v8::Handle<v8::Object>, v8::Isolate*); |
| |
| inline void setObjectGroup(v8::Isolate* isolate, ScriptWrappableBase* scriptWrappableBase, const v8::Persistent<v8::Object>& wrapper) |
| { |
| isolate->SetObjectGroupId(wrapper, v8::UniqueId(reinterpret_cast<intptr_t>(scriptWrappableBase))); |
| } |
| |
| // This struct provides a way to store a bunch of information that is helpful when unwrapping |
| // v8 objects. Each v8 bindings class has exactly one static WrapperTypeInfo member, so |
| // comparing pointers is a safe way to determine if types match. |
| struct WrapperTypeInfo { |
| enum WrapperTypePrototype { |
| WrapperTypeObjectPrototype, |
| WrapperTypeExceptionPrototype, |
| }; |
| |
| enum WrapperClassId { |
| NodeClassId = 1, // NodeClassId must be smaller than ObjectClassId. |
| ObjectClassId, |
| }; |
| |
| enum Lifetime { |
| Dependent, |
| Independent, |
| }; |
| |
| enum GCType { |
| GarbageCollectedObject, |
| WillBeGarbageCollectedObject, |
| RefCountedObject, |
| }; |
| |
| static const WrapperTypeInfo* unwrap(v8::Handle<v8::Value> typeInfoWrapper) |
| { |
| return reinterpret_cast<const WrapperTypeInfo*>(v8::External::Cast(*typeInfoWrapper)->Value()); |
| } |
| |
| |
| bool equals(const WrapperTypeInfo* that) const |
| { |
| return this == that; |
| } |
| |
| bool isSubclass(const WrapperTypeInfo* that) const |
| { |
| for (const WrapperTypeInfo* current = this; current; current = current->parentClass) { |
| if (current == that) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void configureWrapper(v8::PersistentBase<v8::Object>* wrapper) const |
| { |
| wrapper->SetWrapperClassId(wrapperClassId); |
| if (lifetime == Independent) |
| wrapper->MarkIndependent(); |
| } |
| |
| v8::Handle<v8::FunctionTemplate> domTemplate(v8::Isolate* isolate) const |
| { |
| return domTemplateFunction(isolate); |
| } |
| |
| void refObject(ScriptWrappableBase* scriptWrappableBase) const |
| { |
| ASSERT(refObjectFunction); |
| refObjectFunction(scriptWrappableBase); |
| } |
| |
| void derefObject(ScriptWrappableBase* scriptWrappableBase) const |
| { |
| ASSERT(derefObjectFunction); |
| derefObjectFunction(scriptWrappableBase); |
| } |
| |
| void trace(Visitor* visitor, ScriptWrappableBase* scriptWrappableBase) const |
| { |
| ASSERT(traceFunction); |
| return traceFunction(visitor, scriptWrappableBase); |
| } |
| |
| void installConditionallyEnabledMethods(v8::Handle<v8::Object> prototypeTemplate, v8::Isolate* isolate) const |
| { |
| if (installConditionallyEnabledMethodsFunction) |
| installConditionallyEnabledMethodsFunction(prototypeTemplate, isolate); |
| } |
| |
| void installConditionallyEnabledProperties(v8::Handle<v8::Object> prototypeTemplate, v8::Isolate* isolate) const |
| { |
| if (installConditionallyEnabledPropertiesFunction) |
| installConditionallyEnabledPropertiesFunction(prototypeTemplate, isolate); |
| } |
| |
| ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object> object) const |
| { |
| if (!toActiveDOMObjectFunction) |
| return 0; |
| return toActiveDOMObjectFunction(object); |
| } |
| |
| EventTarget* toEventTarget(v8::Handle<v8::Object> object) const |
| { |
| if (!toEventTargetFunction) |
| return 0; |
| return toEventTargetFunction(object); |
| } |
| |
| void visitDOMWrapper(v8::Isolate* isolate, ScriptWrappableBase* scriptWrappableBase, const v8::Persistent<v8::Object>& wrapper) const |
| { |
| if (!visitDOMWrapperFunction) |
| setObjectGroup(isolate, scriptWrappableBase, wrapper); |
| else |
| visitDOMWrapperFunction(isolate, scriptWrappableBase, wrapper); |
| } |
| |
| // This field must be the first member of the struct WrapperTypeInfo. This is also checked by a COMPILE_ASSERT() below. |
| const gin::GinEmbedder ginEmbedder; |
| |
| DomTemplateFunction domTemplateFunction; |
| const RefObjectFunction refObjectFunction; |
| const DerefObjectFunction derefObjectFunction; |
| const TraceFunction traceFunction; |
| const ToActiveDOMObjectFunction toActiveDOMObjectFunction; |
| const ToEventTargetFunction toEventTargetFunction; |
| const ResolveWrapperReachabilityFunction visitDOMWrapperFunction; |
| InstallConditionallyEnabledMethodsFunction installConditionallyEnabledMethodsFunction; |
| const InstallConditionallyEnabledPropertiesFunction installConditionallyEnabledPropertiesFunction; |
| const WrapperTypeInfo* parentClass; |
| const WrapperTypePrototype wrapperTypePrototype; |
| const WrapperClassId wrapperClassId; |
| const Lifetime lifetime; |
| const GCType gcType; |
| }; |
| |
| COMPILE_ASSERT(offsetof(struct WrapperTypeInfo, ginEmbedder) == offsetof(struct gin::WrapperInfo, embedder), wrapper_type_info_compatible_to_gin); |
| |
| template<typename T, int offset> |
| inline T* getInternalField(const v8::Persistent<v8::Object>& persistent) |
| { |
| ASSERT(offset < v8::Object::InternalFieldCount(persistent)); |
| return static_cast<T*>(v8::Object::GetAlignedPointerFromInternalField(persistent, offset)); |
| } |
| |
| template<typename T, int offset> |
| inline T* getInternalField(v8::Handle<v8::Object> wrapper) |
| { |
| ASSERT(offset < wrapper->InternalFieldCount()); |
| return static_cast<T*>(wrapper->GetAlignedPointerFromInternalField(offset)); |
| } |
| |
| inline ScriptWrappableBase* toScriptWrappableBase(const v8::Persistent<v8::Object>& wrapper) |
| { |
| return getInternalField<ScriptWrappableBase, v8DOMWrapperObjectIndex>(wrapper); |
| } |
| |
| inline ScriptWrappableBase* toScriptWrappableBase(v8::Handle<v8::Object> wrapper) |
| { |
| return getInternalField<ScriptWrappableBase, v8DOMWrapperObjectIndex>(wrapper); |
| } |
| |
| inline const WrapperTypeInfo* toWrapperTypeInfo(const v8::Persistent<v8::Object>& wrapper) |
| { |
| return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(wrapper); |
| } |
| |
| inline const WrapperTypeInfo* toWrapperTypeInfo(v8::Handle<v8::Object> wrapper) |
| { |
| return getInternalField<WrapperTypeInfo, v8DOMWrapperTypeIndex>(wrapper); |
| } |
| |
| inline void releaseObject(v8::Handle<v8::Object> wrapper) |
| { |
| toWrapperTypeInfo(wrapper)->derefObject(toScriptWrappableBase(wrapper)); |
| } |
| |
| } // namespace blink |
| |
| #endif // WrapperTypeInfo_h |