| /* |
| * Copyright (C) 2012 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_V8_PER_CONTEXT_DATA_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_PER_CONTEXT_DATA_H_ |
| |
| #include <memory> |
| |
| #include "gin/public/context_holder.h" |
| #include "gin/public/gin_embedders.h" |
| #include "third_party/blink/renderer/platform/bindings/scoped_persistent.h" |
| #include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| #include "third_party/blink/renderer/platform/heap/heap.h" |
| #include "third_party/blink/renderer/platform/heap/persistent.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_map.h" |
| #include "third_party/blink/renderer/platform/wtf/text/atomic_string.h" |
| #include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| #include "v8/include/v8.h" |
| |
| namespace blink { |
| |
| class V8DOMActivityLogger; |
| class V8PerContextData; |
| struct WrapperTypeInfo; |
| |
| // Used to hold data that is associated with a single v8::Context object, and |
| // has a 1:1 relationship with v8::Context. |
| class PLATFORM_EXPORT V8PerContextData final |
| : public GarbageCollected<V8PerContextData> { |
| public: |
| explicit V8PerContextData(v8::Local<v8::Context>); |
| |
| static V8PerContextData* From(v8::Local<v8::Context>); |
| |
| ~V8PerContextData(); |
| |
| void Trace(Visitor* visitor) const; |
| void Dispose(); |
| |
| v8::Local<v8::Context> GetContext() { return context_.NewLocal(isolate_); } |
| |
| // To create JS Wrapper objects, we create a cache of a 'boiler plate' |
| // object, and then simply Clone that object each time we need a new one. |
| // This is faster than going through the full object creation process. |
| v8::Local<v8::Object> CreateWrapperFromCache(const WrapperTypeInfo* type) { |
| auto it = wrapper_boilerplates_.find(type); |
| return it != wrapper_boilerplates_.end() |
| ? it->value.Get()->Clone() |
| : CreateWrapperFromCacheSlowCase(type); |
| } |
| |
| // Returns the interface object that is appropriately initialized (e.g. |
| // context-dependent properties are installed). |
| v8::Local<v8::Function> ConstructorForType(const WrapperTypeInfo* type) { |
| auto it = constructor_map_.find(type); |
| return it != constructor_map_.end() ? it->value.NewLocal(isolate_) |
| : ConstructorForTypeSlowCase(type); |
| } |
| |
| v8::Local<v8::Object> PrototypeForType(const WrapperTypeInfo*); |
| |
| // Gets the constructor and prototype for a type, if they have already been |
| // created. Returns true if they exist, and sets the existing values in |
| // |prototypeObject| and |interfaceObject|. Otherwise, returns false, and the |
| // values are set to empty objects (non-null). |
| bool GetExistingConstructorAndPrototypeForType( |
| const WrapperTypeInfo*, |
| v8::Local<v8::Object>* prototype_object, |
| v8::Local<v8::Function>* interface_object); |
| |
| // Gets a Private to store custom element definition IDs on a |
| // constructor that has been registered as a custom element in this |
| // context. This private has to be per-context because the same |
| // constructor could be simultaneously registered as a custom |
| // element in many contexts and they each need to give it a unique |
| // identifier. |
| v8::Local<v8::Private> GetPrivateCustomElementDefinitionId() { |
| if (UNLIKELY(private_custom_element_definition_id_.IsEmpty())) { |
| private_custom_element_definition_id_.Set(isolate_, |
| v8::Private::New(isolate_)); |
| } |
| return private_custom_element_definition_id_.NewLocal(isolate_); |
| } |
| |
| V8DOMActivityLogger* ActivityLogger() const { return activity_logger_; } |
| void SetActivityLogger(V8DOMActivityLogger* activity_logger) { |
| activity_logger_ = activity_logger; |
| } |
| |
| // Garbage collected classes that use V8PerContextData to hold an instance |
| // should subclass Data, and use addData / clearData / getData to manage the |
| // instance. |
| class PLATFORM_EXPORT Data : public GarbageCollectedMixin {}; |
| |
| void AddData(const char* key, Data*); |
| void ClearData(const char* key); |
| Data* GetData(const char* key); |
| |
| private: |
| v8::Local<v8::Object> CreateWrapperFromCacheSlowCase(const WrapperTypeInfo*); |
| v8::Local<v8::Function> ConstructorForTypeSlowCase(const WrapperTypeInfo*); |
| |
| v8::Isolate* const isolate_; |
| |
| // For each possible type of wrapper, we keep a boilerplate object. |
| // The boilerplate is used to create additional wrappers of the same type. |
| HeapHashMap<const WrapperTypeInfo*, TraceWrapperV8Reference<v8::Object>> |
| wrapper_boilerplates_; |
| |
| HeapHashMap<const WrapperTypeInfo*, TraceWrapperV8Reference<v8::Function>> |
| constructor_map_; |
| |
| std::unique_ptr<gin::ContextHolder> context_holder_; |
| |
| ScopedPersistent<v8::Context> context_; |
| |
| ScopedPersistent<v8::Private> private_custom_element_definition_id_; |
| |
| // This is owned by a static hash map in V8DOMActivityLogger. |
| V8DOMActivityLogger* activity_logger_; |
| |
| using DataMap = HeapHashMap<const char*, Member<Data>>; |
| DataMap data_map_; |
| |
| DISALLOW_COPY_AND_ASSIGN(V8PerContextData); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_PER_CONTEXT_DATA_H_ |