--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/util/TypeReader.java	2016-12-07 13:48:07.416838776 -0800
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015, 2015, 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.
+ *
+ * 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.
+ */
+package org.graalvm.compiler.core.common.util;
+
+/**
+ * Provides low-level read access for signed and unsigned values of size 1, 2, 4, and 8 bytes.
+ */
+public interface TypeReader {
+
+    /** Returns the next byte index to be read. */
+    long getByteIndex();
+
+    /** Sets the next byte index to be read. */
+    void setByteIndex(long byteIndex);
+
+    /** Reads a signed 1 byte value. */
+    int getS1();
+
+    /** Reads an unsigned 1 byte value. */
+    int getU1();
+
+    /** Reads a signed 2 byte value. */
+    int getS2();
+
+    /** Reads an unsigned 2 byte value. */
+    int getU2();
+
+    /** Reads a signed 4 byte value. */
+    int getS4();
+
+    /** Reads an unsigned 4 byte value. */
+    long getU4();
+
+    /** Reads a signed 4 byte value. */
+    long getS8();
+
+    /**
+     * Reads a signed value that has been written using {@link TypeWriter#putSV variable byte size
+     * encoding}.
+     */
+    default long getSV() {
+        long result = 0;
+        int shift = 0;
+        long b;
+        do {
+            b = getU1();
+            result |= (b & 0x7f) << shift;
+            shift += 7;
+        } while ((b & 0x80) != 0);
+
+        if ((b & 0x40) != 0 && shift < 64) {
+            result |= -1L << shift;
+        }
+        return result;
+    }
+
+    /**
+     * Reads a signed variable byte size encoded value that is known to fit into the range of int.
+     */
+    default int getSVInt() {
+        return TypeConversion.asS4(getSV());
+    }
+
+    /**
+     * Reads an unsigned value that has been written using {@link TypeWriter#putSV variable byte
+     * size encoding}.
+     */
+    default long getUV() {
+        long result = 0;
+        int shift = 0;
+        long b;
+        do {
+            b = getU1();
+            result |= (b & 0x7f) << shift;
+            shift += 7;
+        } while ((b & 0x80) != 0);
+
+        return result;
+    }
+
+    /**
+     * Reads an unsigned variable byte size encoded value that is known to fit into the range of
+     * int.
+     */
+    default int getUVInt() {
+        return TypeConversion.asS4(getUV());
+    }
+}