--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/debug/IntervalDumper.java	2016-12-09 00:54:20.697157211 -0800
@@ -0,0 +1,63 @@
+/*
+ * 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.lir.debug;
+
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Provides abstract access to intervals for dumping.
+ */
+public interface IntervalDumper {
+
+    public interface IntervalVisitor {
+        void visitIntervalStart(Value parentOperand, Value splitOperand, Value location, Value hint, String typeName);
+
+        void visitRange(int from, int to);
+
+        void visitUsePos(int pos, Object registerPrioObject);
+
+        void visitIntervalEnd(Object spillState);
+
+    }
+
+    /**
+     * Visits the {@link IntervalVisitor} for every interval.
+     *
+     * The order is as follows:
+     * <ul>
+     * <li>Call {@link IntervalVisitor#visitIntervalStart}</li>
+     * <li>For every range:
+     * <ul>
+     * <li>Call {@link IntervalVisitor#visitRange}</li>
+     * </ul>
+     * <li>For every use position:
+     * <ul>
+     * <li>Call {@link IntervalVisitor#visitUsePos}</li>
+     * </ul>
+     * </li>
+     * <li>call {@link IntervalVisitor#visitIntervalEnd}</li>
+     * </ul>
+     */
+    void visitIntervals(IntervalVisitor visitor);
+
+}