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diff --git a/openjdkjvmti/fixed_up_dex_file.h b/openjdkjvmti/fixed_up_dex_file.h
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+/* Copyright (C) 2017 The Android Open Source Project
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This file implements interfaces from the file jvmti.h. This implementation
+ * is licensed under the same terms as the file jvmti.h.  The
+ * copyright and license information for the file jvmti.h follows.
+ *
+ * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifndef ART_OPENJDKJVMTI_FIXED_UP_DEX_FILE_H_
+#define ART_OPENJDKJVMTI_FIXED_UP_DEX_FILE_H_
+
+#include <memory>
+#include <vector>
+
+#include "jni.h"
+#include "jvmti.h"
+
+#include "base/mutex.h"
+#include "dex_file.h"
+
+namespace openjdkjvmti {
+
+// A holder for a DexFile that has been 'fixed up' to ensure it is fully compliant with the
+// published standard (no internal/quick opcodes, all fields are the defined values, etc). This is
+// used to ensure that agents get a consistent dex file regardless of what version of android they
+// are running on.
+class FixedUpDexFile {
+ public:
+  static std::unique_ptr<FixedUpDexFile> Create(const art::DexFile& original)
+      REQUIRES_SHARED(art::Locks::mutator_lock_);
+
+  const art::DexFile& GetDexFile() {
+    return *dex_file_;
+  }
+
+  const unsigned char* Begin() {
+    return data_.data();
+  }
+
+  size_t Size() {
+    return data_.size();
+  }
+
+ private:
+  explicit FixedUpDexFile(std::unique_ptr<const art::DexFile> fixed_up_dex_file,
+                          std::vector<unsigned char> data)
+      : dex_file_(std::move(fixed_up_dex_file)),
+        data_(std::move(data)) {}
+
+  // the fixed up DexFile
+  std::unique_ptr<const art::DexFile> dex_file_;
+  // The backing data for dex_file_.
+  const std::vector<unsigned char> data_;
+
+  DISALLOW_COPY_AND_ASSIGN(FixedUpDexFile);
+};
+
+}  // namespace openjdkjvmti
+
+#endif  // ART_OPENJDKJVMTI_FIXED_UP_DEX_FILE_H_