| /* |
| * 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_ |
| |
| #include "gin/public/wrapper_info.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/assertions.h" |
| #include "v8/include/v8.h" |
| |
| namespace blink { |
| |
| class ActiveScriptWrappableBase; |
| class DOMWrapperWorld; |
| class ScriptWrappable; |
| |
| ScriptWrappable* ToScriptWrappable( |
| const v8::PersistentBase<v8::Object>& wrapper); |
| ScriptWrappable* ToScriptWrappable(v8::Local<v8::Object> wrapper); |
| |
| static const int kV8DOMWrapperTypeIndex = |
| static_cast<int>(gin::kWrapperInfoIndex); |
| static const int kV8DOMWrapperObjectIndex = |
| static_cast<int>(gin::kEncodedValueIndex); |
| static const int kV8DefaultWrapperInternalFieldCount = |
| static_cast<int>(gin::kNumberOfInternalFields); |
| static const int kV8PrototypeTypeIndex = 0; |
| static const int kV8PrototypeInternalFieldcount = 1; |
| |
| typedef v8::Local<v8::FunctionTemplate> ( |
| *DomTemplateFunction)(v8::Isolate*, const DOMWrapperWorld&); |
| typedef ActiveScriptWrappableBase* (*ToActiveScriptWrappableFunction)( |
| v8::Local<v8::Object>); |
| typedef void (*ResolveWrapperReachabilityFunction)( |
| v8::Isolate*, |
| ScriptWrappable*, |
| const v8::Persistent<v8::Object>&); |
| typedef void (*InstallConditionalFeaturesFunction)( |
| v8::Local<v8::Context>, |
| const DOMWrapperWorld&, |
| v8::Local<v8::Object>, |
| v8::Local<v8::Object>, |
| v8::Local<v8::Function>, |
| v8::Local<v8::FunctionTemplate>); |
| |
| // 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 { |
| DISALLOW_NEW(); |
| |
| enum WrapperTypePrototype { |
| kWrapperTypeObjectPrototype, |
| kWrapperTypeNoPrototype, // For legacy callback interface |
| }; |
| |
| enum WrapperClassId { |
| kNodeClassId = 1, // NodeClassId must be smaller than ObjectClassId. |
| kObjectClassId, |
| }; |
| |
| enum ActiveScriptWrappableInheritance { |
| kNotInheritFromActiveScriptWrappable, |
| kInheritFromActiveScriptWrappable, |
| }; |
| |
| static const WrapperTypeInfo* Unwrap(v8::Local<v8::Value> type_info_wrapper) { |
| return reinterpret_cast<const WrapperTypeInfo*>( |
| v8::External::Cast(*type_info_wrapper)->Value()); |
| } |
| |
| PLATFORM_EXPORT static void WrapperCreated(); |
| PLATFORM_EXPORT static void WrapperDestroyed(); |
| |
| bool Equals(const WrapperTypeInfo* that) const { return this == that; } |
| |
| bool IsSubclass(const WrapperTypeInfo* that) const { |
| for (const WrapperTypeInfo* current = this; current; |
| current = current->parent_class) { |
| if (current == that) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void ConfigureWrapper(v8::PersistentBase<v8::Object>* wrapper) const { |
| wrapper->SetWrapperClassId(wrapper_class_id); |
| } |
| |
| v8::Local<v8::FunctionTemplate> domTemplate( |
| v8::Isolate* isolate, |
| const DOMWrapperWorld& world) const { |
| return dom_template_function(isolate, world); |
| } |
| |
| void InstallConditionalFeatures( |
| v8::Local<v8::Context> context, |
| const DOMWrapperWorld& world, |
| v8::Local<v8::Object> instance_object, |
| v8::Local<v8::Object> prototype_object, |
| v8::Local<v8::Function> interface_object, |
| v8::Local<v8::FunctionTemplate> interface_template) const { |
| if (install_conditional_features_function) { |
| install_conditional_features_function(context, world, instance_object, |
| prototype_object, interface_object, |
| interface_template); |
| } |
| } |
| |
| bool IsActiveScriptWrappable() const { |
| return active_script_wrappable_inheritance == |
| kInheritFromActiveScriptWrappable; |
| } |
| |
| // This field must be the first member of the struct WrapperTypeInfo. |
| // See also static_assert() in .cpp file. |
| const gin::GinEmbedder gin_embedder; |
| |
| DomTemplateFunction dom_template_function; |
| InstallConditionalFeaturesFunction install_conditional_features_function; |
| const char* const interface_name; |
| const WrapperTypeInfo* parent_class; |
| const unsigned wrapper_type_prototype : 2; // WrapperTypePrototype |
| const unsigned wrapper_class_id : 2; // WrapperClassId |
| const unsigned // ActiveScriptWrappableInheritance |
| active_script_wrappable_inheritance : 1; |
| }; |
| |
| template <typename T, int offset> |
| inline T* GetInternalField(const v8::PersistentBase<v8::Object>& persistent) { |
| DCHECK_LT(offset, v8::Object::InternalFieldCount(persistent)); |
| return reinterpret_cast<T*>( |
| v8::Object::GetAlignedPointerFromInternalField(persistent, offset)); |
| } |
| |
| template <typename T, int offset> |
| inline T* GetInternalField(v8::Local<v8::Object> wrapper) { |
| DCHECK_LT(offset, wrapper->InternalFieldCount()); |
| return reinterpret_cast<T*>( |
| wrapper->GetAlignedPointerFromInternalField(offset)); |
| } |
| |
| // The return value can be null if |wrapper| is a global proxy, which points to |
| // nothing while a navigation. |
| inline ScriptWrappable* ToScriptWrappable( |
| const v8::PersistentBase<v8::Object>& wrapper) { |
| return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper); |
| } |
| |
| inline ScriptWrappable* ToScriptWrappable(v8::Local<v8::Object> wrapper) { |
| return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper); |
| } |
| |
| inline const WrapperTypeInfo* ToWrapperTypeInfo( |
| const v8::PersistentBase<v8::Object>& wrapper) { |
| return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper); |
| } |
| |
| inline const WrapperTypeInfo* ToWrapperTypeInfo(v8::Local<v8::Object> wrapper) { |
| return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper); |
| } |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_ |