WIP: Create a LongStringCollection that transfers long strings with fewer copies.

third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h

 /*
  * Copyright (C) 2009, 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
@@ skipping 18 matching lines @@
  */
 
 #ifndef SerializedScriptValue_h
 #define SerializedScriptValue_h
 
 #include <memory>
 
 #include "bindings/core/v8/NativeValueTraits.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/Transferables.h"
+#include "bindings/core/v8/serialization/LongStringCollection.h"
 #include "core/CoreExport.h"
 #include "v8/include/v8.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 #include "wtf/ThreadSafeRefCounted.h"
 #include "wtf/allocator/Partitions.h"
 #include "wtf/typed_arrays/ArrayBufferContents.h"
 
 namespace blink {
 
@@ skipping 25 matching lines @@
   static const uint32_t wireFormatVersion = 9;
 
   // VarInt encoding constants.
   static const int varIntShift = 7;
   static const int varIntMask = (1 << varIntShift) - 1;
 
   struct SerializeOptions {
     STACK_ALLOCATED();
     Transferables* transferables = nullptr;
     WebBlobInfoArray* blobInfo = nullptr;
+    LongStringPolicy longStringPolicy;
   };
   static PassRefPtr<SerializedScriptValue> serialize(v8::Isolate*,
                                                      v8::Local<v8::Value>,
                                                      const SerializeOptions&,
                                                      ExceptionState&);
   static PassRefPtr<SerializedScriptValue> serializeAndSwallowExceptions(
       v8::Isolate*,
       v8::Local<v8::Value>);
 
   static PassRefPtr<SerializedScriptValue> create();
+  static PassRefPtr<SerializedScriptValue> create(LongStringPolicy);
   static PassRefPtr<SerializedScriptValue> create(const String&);
   static PassRefPtr<SerializedScriptValue> create(const char* data,
                                                   size_t length);
 
   ~SerializedScriptValue();
 
   static PassRefPtr<SerializedScriptValue> nullValue();
 
   String toWireString() const;
   void toWireBytes(Vector<char>&) const;
@@ skipping 53 matching lines @@
   const uint8_t* data() const { return m_dataBuffer.get(); }
   size_t dataLengthInBytes() const { return m_dataBufferSize; }
 
   BlobDataHandleMap& blobDataHandles() { return m_blobDataHandles; }
   ArrayBufferContentsArray* getArrayBufferContentsArray() {
     return m_arrayBufferContentsArray.get();
   }
   ImageBitmapContentsArray* getImageBitmapContentsArray() {
     return m_imageBitmapContentsArray.get();
   }
+  const LongStringCollection& longStrings() { return m_longStrings; }
 
  private:
   friend class ScriptValueSerializer;
   friend class V8ScriptValueSerializer;
 
   struct BufferDeleter {
     void operator()(uint8_t* buffer) { WTF::Partitions::bufferFree(buffer); }
   };
   using DataBufferPtr = std::unique_ptr<uint8_t[], BufferDeleter>;
 
   SerializedScriptValue();
+  explicit SerializedScriptValue(LongStringPolicy);
   explicit SerializedScriptValue(const String& wireData);
 
   void setData(DataBufferPtr data, size_t size) {
     m_dataBuffer = std::move(data);
     m_dataBufferSize = size;
   }
 
   void transferArrayBuffers(v8::Isolate*,
                             const ArrayBufferArray&,
                             ExceptionState&);
   void transferImageBitmaps(v8::Isolate*,
                             const ImageBitmapArray&,
                             ExceptionState&);
   void transferOffscreenCanvas(v8::Isolate*,
                                const OffscreenCanvasArray&,
                                ExceptionState&);
 
   DataBufferPtr m_dataBuffer;
   size_t m_dataBufferSize = 0;
 
   std::unique_ptr<ArrayBufferContentsArray> m_arrayBufferContentsArray;
   std::unique_ptr<ImageBitmapContentsArray> m_imageBitmapContentsArray;
   BlobDataHandleMap m_blobDataHandles;
+  LongStringCollection m_longStrings;
 
   bool m_hasRegisteredExternalAllocation;
   bool m_transferablesNeedExternalAllocationRegistration;
 };
 
 template <>
 struct NativeValueTraits<SerializedScriptValue>
     : public NativeValueTraitsBase<SerializedScriptValue> {
   CORE_EXPORT static inline PassRefPtr<SerializedScriptValue> nativeValue(
       v8::Isolate* isolate,
       v8::Local<v8::Value> value,
       ExceptionState& exceptionState) {
     return SerializedScriptValue::serialize(
         isolate, value, SerializedScriptValue::SerializeOptions(),
         exceptionState);
   }
 };
 
 }  // namespace blink
 
 #endif  // SerializedScriptValue_h