--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.java/src/org/graalvm/compiler/java/JsrScope.java	2016-12-07 13:50:58.506358838 -0800
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.java;
+
+public class JsrScope {
+
+    public static final JsrScope EMPTY_SCOPE = new JsrScope();
+
+    private final long scope;
+
+    private JsrScope(long scope) {
+        this.scope = scope;
+    }
+
+    public JsrScope() {
+        this.scope = 0;
+    }
+
+    public int nextReturnAddress() {
+        return (int) (scope & 0xffff);
+    }
+
+    public JsrScope push(int jsrReturnBci) {
+        if ((scope & 0xffff000000000000L) != 0) {
+            throw new JsrNotSupportedBailout("only four jsr nesting levels are supported");
+        }
+        return new JsrScope((scope << 16) | jsrReturnBci);
+    }
+
+    public boolean isEmpty() {
+        return scope == 0;
+    }
+
+    public boolean isPrefixOf(JsrScope other) {
+        return (scope & other.scope) == scope;
+    }
+
+    public JsrScope pop() {
+        return new JsrScope(scope >>> 16);
+    }
+
+    @Override
+    public int hashCode() {
+        return (int) (scope ^ (scope >>> 32));
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        return obj != null && getClass() == obj.getClass() && scope == ((JsrScope) obj).scope;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        long tmp = scope;
+        sb.append(" [");
+        while (tmp != 0) {
+            sb.append(", ").append(tmp & 0xffff);
+            tmp = tmp >>> 16;
+        }
+        sb.append(']');
+        return sb.toString();
+    }
+}