--- a/graal/com.oracle.graal.truffle.hotspot/src/com/oracle/graal/truffle/hotspot/HotSpotTruffleRuntime.java	Sat Aug 23 19:31:48 2014 +0200
+++ b/graal/com.oracle.graal.truffle.hotspot/src/com/oracle/graal/truffle/hotspot/HotSpotTruffleRuntime.java	Sat Aug 23 19:31:40 2014 +0200
@@ -59,6 +59,7 @@
 import com.oracle.truffle.api.CompilerDirectives.SlowPath;
 import com.oracle.truffle.api.frame.*;
 import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.nodes.Node;
 
 /**
  * Implementation of the Truffle runtime when running on top of Graal.
@@ -117,6 +118,13 @@
         return new OptimizedCallTarget(rootNode, this, TruffleMinInvokeThreshold.getValue(), TruffleCompilationThreshold.getValue(), compilationPolicy, new HotSpotSpeculationLog());
     }
 
+    public LoopNode createLoopNode(RepeatingNode repeating) {
+        if (!(repeating instanceof Node)) {
+            throw new IllegalArgumentException("Repeating node must be of type Node.");
+        }
+        return new OptimizedLoopNode(repeating);
+    }
+
     public DirectCallNode createDirectCallNode(CallTarget target) {
         if (target instanceof OptimizedCallTarget) {
             return new OptimizedDirectCallNode((OptimizedCallTarget) target);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/OptimizedLoopNode.java	Sat Aug 23 19:31:40 2014 +0200
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ *
+ * 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.graal.truffle;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.CompilerDirectives.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Temporary node for legacy loop count reporting support as it was most likely done in other
+ * implementations.
+ */
+public final class OptimizedLoopNode extends LoopNode {
+
+    @CompilationFinal private int loopCount;
+
+    public OptimizedLoopNode(RepeatingNode body) {
+        super(body);
+    }
+
+    @Override
+    public void executeLoop(VirtualFrame frame) {
+        try {
+            do {
+            } while (executeBody(frame));
+        } finally {
+            loopDone();
+        }
+    }
+
+    private final boolean executeBody(VirtualFrame frame) {
+        boolean result = executeRepeatNode(frame);
+        if (CompilerDirectives.inInterpreter()) {
+            if (result) {
+                loopCount++;
+            }
+        }
+        return result;
+    }
+
+    private void loopDone() {
+        if (CompilerDirectives.inInterpreter()) {
+            getRootNode().reportLoopCount(loopCount);
+            loopCount = 0;
+        }
+    }
+}
\ No newline at end of file

--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleRuntime.java	Sat Aug 23 19:31:48 2014 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleRuntime.java	Sat Aug 23 19:31:40 2014 +0200
@@ -59,6 +59,11 @@
     DirectCallNode createDirectCallNode(CallTarget target);
 
     /**
+     * Experimental API. May change without notice.
+     */
+    LoopNode createLoopNode(RepeatingNode body);
+
+    /**
      * Creates a new runtime specific version of {@link IndirectCallNode}.
      *
      * @return the new call node
@@ -135,4 +140,5 @@
      * Internal API method. Do not use.
      */
     void notifyTransferToInterpreter();
+
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultLoopNode.java	Sat Aug 23 19:31:40 2014 +0200
@@ -0,0 +1,41 @@
+/*
+ * 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.impl;
+
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+
+public final class DefaultLoopNode extends LoopNode {
+
+    public DefaultLoopNode(RepeatingNode repeatNode) {
+        super(repeatNode);
+    }
+
+    @Override
+    public void executeLoop(VirtualFrame frame) {
+        do {
+        } while (executeRepeatNode(frame));
+    }
+}

--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultTruffleRuntime.java	Sat Aug 23 19:31:48 2014 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultTruffleRuntime.java	Sat Aug 23 19:31:40 2014 +0200
@@ -138,4 +138,11 @@
 
     public void notifyTransferToInterpreter() {
     }
+
+    public LoopNode createLoopNode(RepeatingNode repeating) {
+        if (!(repeating instanceof Node)) {
+            throw new IllegalArgumentException("Repeating node must be of type Node.");
+        }
+        return new DefaultLoopNode(repeating);
+    }
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/LoopNode.java	Sat Aug 23 19:31:40 2014 +0200
@@ -0,0 +1,53 @@
+/*
+ * 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.nodes;
+
+import com.oracle.truffle.api.frame.*;
+
+/**
+ * Experimental API: may change significantly without notice.
+ */
+public abstract class LoopNode extends Node {
+
+    /*
+     * TODO Unfortunately we cannot yet use interface typed fields as child fields.
+     */
+    @Child protected Node repeatingNode;
+
+    public LoopNode(RepeatingNode repeatintNode) {
+        this.repeatingNode = (Node) repeatintNode;
+    }
+
+    public abstract void executeLoop(VirtualFrame frame);
+
+    protected final boolean executeRepeatNode(VirtualFrame frame) {
+        return getRepeatNode().executeRepeating(frame);
+    }
+
+    public final RepeatingNode getRepeatNode() {
+        return (RepeatingNode) repeatingNode;
+    }
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RepeatingNode.java	Sat Aug 23 19:31:40 2014 +0200
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2012, 2013, 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.nodes;
+
+import com.oracle.truffle.api.frame.*;
+
+/**
+ * Experimental API: may change significantly without notice.
+ */
+public interface RepeatingNode {
+
+    boolean executeRepeating(VirtualFrame frame);
+
+}