--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/BranchProfile.java	Thu Dec 17 10:01:38 2015 +0100
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2013, 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.  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.profiles;
+
+import com.oracle.truffle.api.CompilerDirectives;
+import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
+import com.oracle.truffle.api.Truffle;
+
+/**
+ * <p>
+ * BranchProfiles are profiles to speculate on branches that are unlikely to be visited. If the
+ * {@link #enter()} method is invoked first the optimized code is invalidated and the branch where
+ * {@link #enter()} is invoked is enabled for compilation. Otherwise if the {@link #enter()} method
+ * was never invoked the branch will not get compiled.
+ * </p>
+ *
+ * <p>
+ * <b> Usage example: </b>
+ *
+ * <pre>
+ * class SampleNode extends Node {
+ * 
+ *     final BranchProfile errorProfile = BranchProfile.create();
+ * 
+ *     void execute(int value) {
+ *         if (value == Integer.MAX_VALUE) {
+ *             errorProfile.enter();
+ *             throw new Error(&quot;Invalid input value&quot;)
+ *         }
+ *         return value;
+ *     }
+ * }
+ * </pre>
+ *
+ * {@inheritDoc}
+ *
+ * @see BranchProfile#enter()
+ */
+public abstract class BranchProfile extends Profile {
+
+    BranchProfile() {
+    }
+
+    /**
+     * Call when an unlikely branch is entered.
+     */
+    public abstract void enter();
+
+    /**
+     * @deprecated it is not reliable when profiling is turned off.
+     */
+    @Deprecated
+    public abstract boolean isVisited();
+
+    /**
+     * Call to create a new instance of a branch profile.
+     */
+    public static BranchProfile create() {
+        if (Truffle.getRuntime().isProfilingEnabled()) {
+            return Enabled.create0();
+        } else {
+            return Disabled.INSTANCE;
+        }
+    }
+
+    static final class Enabled extends BranchProfile {
+
+        @CompilationFinal private boolean visited;
+
+        @Override
+        public void enter() {
+            if (!visited) {
+                CompilerDirectives.transferToInterpreterAndInvalidate();
+                visited = true;
+            }
+        }
+
+        @SuppressWarnings("deprecation")
+        @Override
+        public boolean isVisited() {
+            return visited;
+        }
+
+        @Override
+        public String toString() {
+            return toString(BranchProfile.class, !visited, false, "VISITED");
+        }
+
+        /* Needed for lazy class loading. */
+        static BranchProfile create0() {
+            return new Enabled();
+        }
+    }
+
+    static final class Disabled extends BranchProfile {
+
+        static final BranchProfile INSTANCE = new Disabled();
+
+        @Override
+        protected Object clone() {
+            return INSTANCE;
+        }
+
+        @Override
+        public void enter() {
+        }
+
+        @SuppressWarnings("deprecation")
+        @Override
+        public boolean isVisited() {
+            return true;
+        }
+
+        @Override
+        public String toString() {
+            return toStringDisabled(BranchProfile.class);
+        }
+
+    }
+
+}