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/*
* 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 "base/memory/raw_ptr.h"
#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/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.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/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>);
V8PerContextData(const V8PerContextData&) = delete;
V8PerContextData& operator=(const V8PerContextData&) = delete;
~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(v8::Isolate* isolate,
const WrapperTypeInfo* type) {
if (auto it = wrapper_boilerplates_.find(type);
it != wrapper_boilerplates_.end()) {
v8::Local<v8::Object> obj = it->value.Get(isolate_);
return obj->Clone(isolate);
}
return CreateWrapperFromCacheSlowCase(isolate, 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.Get(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);
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(v8::Isolate*,
const WrapperTypeInfo*);
v8::Local<v8::Function> ConstructorForTypeSlowCase(const WrapperTypeInfo*);
const raw_ptr<v8::Isolate> 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_;
// This is owned by a static hash map in V8DOMActivityLogger.
raw_ptr<V8DOMActivityLogger, DanglingUntriaged> activity_logger_;
using DataMap = HeapHashMap<const char*, Member<Data>>;
DataMap data_map_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_PER_CONTEXT_DATA_H_
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