- Change the layout of external typed array objects to avoid the extra indirection when accessing e…

runtime/bin/io_buffer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#ifndef IO_BUFFER_H_
-#define IO_BUFFER_H_
+#ifndef BIN_IO_BUFFER_H_
+#define BIN_IO_BUFFER_H_
 
 #include "platform/globals.h"
 
 #include "include/dart_api.h"
 
 class IOBuffer {
  public:
   // Allocate an IO buffer dart object (of type Uint8List) backed by
   // an external byte array.
   static Dart_Handle Allocate(intptr_t size, uint8_t **buffer);
 
   // Allocate IO buffer storage.
   static uint8_t* Allocate(intptr_t size);
 
   // Function for disposing of IO buffer storage. All backing storage
   // for IO buffers must be freed using this function.
   static void Free(void* buffer) {
     delete[] reinterpret_cast<uint8_t*>(buffer);
   }
 
+  // Function for finalizing external byte arrays used as IO buffers.
+  static void Finalizer(Dart_Handle handle, void* buffer) {
+    Free(buffer);
+    if (handle != NULL) {
+      Dart_DeletePersistentHandle(handle);
+    }
+  }
+
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(IOBuffer);
 };
 
-#endif  // IO_BUFFER_H_
+#endif  // BIN_IO_BUFFER_H_