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diff --git a/openjdkjvmti/fixed_up_dex_file.cc b/openjdkjvmti/fixed_up_dex_file.cc
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+++ b/openjdkjvmti/fixed_up_dex_file.cc
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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.
+ */
+
+#include "fixed_up_dex_file.h"
+#include "dex_file-inl.h"
+
+// Runtime includes.
+#include "dex_to_dex_decompiler.h"
+#include "oat_file.h"
+#include "vdex_file.h"
+
+namespace openjdkjvmti {
+
+static void RecomputeDexChecksum(art::DexFile* dex_file)
+    REQUIRES_SHARED(art::Locks::mutator_lock_) {
+  reinterpret_cast<art::DexFile::Header*>(const_cast<uint8_t*>(dex_file->Begin()))->checksum_ =
+      dex_file->CalculateChecksum();
+}
+
+static void DoDexUnquicken(const art::DexFile& new_dex_file, const art::DexFile& original_dex_file)
+    REQUIRES_SHARED(art::Locks::mutator_lock_) {
+  const art::OatDexFile* oat_dex = original_dex_file.GetOatDexFile();
+  if (oat_dex == nullptr) {
+    return;
+  }
+  const art::OatFile* oat_file = oat_dex->GetOatFile();
+  if (oat_file == nullptr) {
+    return;
+  }
+  const art::VdexFile* vdex = oat_file->GetVdexFile();
+  if (vdex == nullptr) {
+    return;
+  }
+  vdex->FullyUnquickenDexFile(new_dex_file, original_dex_file);
+}
+
+std::unique_ptr<FixedUpDexFile> FixedUpDexFile::Create(const art::DexFile& original) {
+  // Copy the data into mutable memory.
+  std::vector<unsigned char> data;
+  data.resize(original.Size());
+  memcpy(data.data(), original.Begin(), original.Size());
+  std::string error;
+  std::unique_ptr<const art::DexFile> new_dex_file(art::DexFile::Open(
+      data.data(),
+      data.size(),
+      /*location*/"Unquickening_dexfile.dex",
+      /*location_checksum*/0,
+      /*oat_dex_file*/nullptr,
+      /*verify*/false,
+      /*verify_checksum*/false,
+      &error));
+  if (new_dex_file.get() == nullptr) {
+    LOG(ERROR) << "Unable to open dex file from memory for unquickening! error: " << error;
+    return nullptr;
+  }
+
+  DoDexUnquicken(*new_dex_file, original);
+  RecomputeDexChecksum(const_cast<art::DexFile*>(new_dex_file.get()));
+  std::unique_ptr<FixedUpDexFile> ret(new FixedUpDexFile(std::move(new_dex_file), std::move(data)));
+  return ret;
+}
+
+}  // namespace openjdkjvmti