--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ValueProfile.java	Wed Sep 03 14:58:53 2014 +0200
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+package com.oracle.truffle.api.utilities;
+
+/**
+ * Utility class to speculate on certain properties of values.
+ *
+ * Example usage:
+ *
+ * <pre>
+ * private final ValueProfile classProfile = ValueProfile.createClassProfile();
+ *
+ * return classProfile.profile(value);
+ * </pre>
+ *
+ * All instances of {@code ValueProfile} (and subclasses) must be held in {@code final} fields for
+ * compiler optimizations to take effect.
+ *
+ * @see #createIdentityProfile()
+ * @see #createClassProfile()
+ */
+public abstract class ValueProfile {
+
+    public abstract <T> T profile(T value);
+
+    /**
+     * Returns a {@link ValueProfile} that speculates on the exact class of a value.
+     */
+    public static ValueProfile createClassProfile() {
+        return new ExactClassValueProfile();
+    }
+
+    /**
+     * Returns a {@link ValueProfile} that speculates on the object identity of a value.
+     */
+    public static ValueProfile createIdentityProfile() {
+        return new IdentityValueProfile();
+    }
+
+}