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

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

 /*
  * 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
@@ skipping 67 matching lines @@
   if (exceptionState.hadException())
     return nullValue();
   return serialized.release();
 }
 
 PassRefPtr<SerializedScriptValue> SerializedScriptValue::create() {
   return adoptRef(new SerializedScriptValue);
 }
 
 PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(
+    LongStringPolicy longStringPolicy) {
+  return adoptRef(new SerializedScriptValue(longStringPolicy));
+}
+
+PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(
     const String& data) {
   return adoptRef(new SerializedScriptValue(data));
 }
 
 PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(
     const char* data,
     size_t length) {
   if (!data)
     return create();
 
   // Decode wire data from big endian to host byte order.
   DCHECK(!(length % sizeof(UChar)));
   size_t stringLength = length / sizeof(UChar);
   StringBuffer<UChar> buffer(stringLength);
   const UChar* src = reinterpret_cast<const UChar*>(data);
   UChar* dst = buffer.characters();
   for (size_t i = 0; i < stringLength; i++)
     dst[i] = ntohs(src[i]);
 
   return adoptRef(new SerializedScriptValue(String::adopt(buffer)));
 }
 
 SerializedScriptValue::SerializedScriptValue()
     : m_hasRegisteredExternalAllocation(false),
       m_transferablesNeedExternalAllocationRegistration(false) {}
 
+SerializedScriptValue::SerializedScriptValue(LongStringPolicy longStringPolicy)
+    : m_longStrings(longStringPolicy),
+      m_hasRegisteredExternalAllocation(false),
+      m_transferablesNeedExternalAllocationRegistration(false) {}
+
 SerializedScriptValue::SerializedScriptValue(const String& wireData)
     : m_hasRegisteredExternalAllocation(false),
       m_transferablesNeedExternalAllocationRegistration(false) {
   size_t byteLength = wireData.length() * 2;
   m_dataBuffer.reset(static_cast<uint8_t*>(WTF::Partitions::bufferMalloc(
       byteLength, "SerializedScriptValue buffer")));
   m_dataBufferSize = byteLength;
   wireData.copyTo(reinterpret_cast<UChar*>(m_dataBuffer.get()), 0,
                   wireData.length());
 }
@@ skipping 337 matching lines @@
   // Only (re)register allocation cost for transferables if this
   // SerializedScriptValue has explicitly unregistered them before.
   if (m_arrayBufferContentsArray &&
       m_transferablesNeedExternalAllocationRegistration) {
     for (auto& buffer : *m_arrayBufferContentsArray)
       buffer.registerExternalAllocationWithCurrentContext();
   }
 }
 
 }  // namespace blink