--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/alloc/lsra/LinearScanIntervalDumper.java	2017-02-15 17:05:28.038605670 -0800
@@ -0,0 +1,75 @@
+/*
+ * 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.alloc.lsra;
+
+import static jdk.vm.ci.code.ValueUtil.isRegister;
+
+import org.graalvm.compiler.lir.alloc.lsra.Interval.UsePosList;
+import org.graalvm.compiler.lir.debug.IntervalDumper;
+
+import jdk.vm.ci.meta.AllocatableValue;
+import jdk.vm.ci.meta.Value;
+
+class LinearScanIntervalDumper implements IntervalDumper {
+    private final Interval[] intervals;
+
+    LinearScanIntervalDumper(Interval[] intervals) {
+        this.intervals = intervals;
+    }
+
+    @Override
+    public void visitIntervals(IntervalVisitor visitor) {
+        for (Interval interval : intervals) {
+            if (interval != null) {
+                printInterval(interval, visitor);
+            }
+        }
+    }
+
+    private static void printInterval(Interval interval, IntervalVisitor visitor) {
+        Value hint = interval.locationHint(false) != null ? interval.locationHint(false).operand : null;
+        AllocatableValue operand = interval.operand;
+        String type = isRegister(operand) ? "fixed" : operand.getValueKind().getPlatformKind().toString();
+        visitor.visitIntervalStart(interval.splitParent().operand, operand, interval.location(), hint, type);
+
+        // print ranges
+        Range cur = interval.first();
+        while (cur != Range.EndMarker) {
+            visitor.visitRange(cur.from, cur.to);
+            cur = cur.next;
+            assert cur != null : "range list not closed with range sentinel";
+        }
+
+        // print use positions
+        int prev = -1;
+        UsePosList usePosList = interval.usePosList();
+        for (int i = usePosList.size() - 1; i >= 0; --i) {
+            assert prev < usePosList.usePos(i) : "use positions not sorted";
+            visitor.visitUsePos(usePosList.usePos(i), usePosList.registerPriority(i));
+            prev = usePosList.usePos(i);
+        }
+
+        visitor.visitIntervalEnd(interval.spillState());
+    }
+
+}