--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLRepeatingNode.java	Sat Aug 23 19:31:44 2014 +0200
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2012, 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.truffle.sl.nodes.controlflow;
+
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.source.*;
+import com.oracle.truffle.api.utilities.*;
+import com.oracle.truffle.sl.nodes.*;
+
+public final class SLRepeatingNode extends Node implements RepeatingNode {
+
+    /**
+     * The condition of the loop. This in a {@link SLExpressionNode} because we require a result
+     * value. We do not have a node type that can only return a {@code boolean} value, so
+     * {@link #evaluateCondition executing the condition} can lead to a type error.
+     */
+    @Child private SLExpressionNode conditionNode;
+
+    /** Statement (or {@link SLBlockNode block}) executed as long as the condition is true. */
+    @Child private SLStatementNode bodyNode;
+
+    /**
+     * Profiling information, collected by the interpreter, capturing whether a {@code continue}
+     * statement was used in this loop. This allows the compiler to generate better code for loops
+     * without a {@code continue}.
+     */
+    private final BranchProfile continueTaken = new BranchProfile();
+    private final BranchProfile breakTaken = new BranchProfile();
+
+    public SLRepeatingNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode bodyNode) {
+        super(src);
+        this.conditionNode = conditionNode;
+        this.bodyNode = bodyNode;
+    }
+
+    public boolean executeRepeating(VirtualFrame frame) {
+        if (evaluateCondition(frame)) {
+            try {
+                /* Execute the loop body. */
+                bodyNode.executeVoid(frame);
+            } catch (SLContinueException ex) {
+                /* In the interpreter, record profiling information that the loop uses continue. */
+                continueTaken.enter();
+                /* Fall through to next loop iteration. */
+            } catch (SLBreakException ex) {
+                /* In the interpreter, record profiling information that the loop uses break. */
+                breakTaken.enter();
+                /* Done executing this loop, exit method to execute statement following the loop. */
+                return false;
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private boolean evaluateCondition(VirtualFrame frame) {
+        try {
+            /*
+             * The condition must evaluate to a boolean value, so we call the boolean-specialized
+             * execute method.
+             */
+            return (conditionNode.executeBoolean(frame));
+        } catch (UnexpectedResultException ex) {
+            /*
+             * The condition evaluated to a non-boolean result. This is a type error in the SL
+             * program. We report it with the same exception that Truffle DSL generated nodes use to
+             * report type errors.
+             */
+            throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult());
+        }
+    }
+
+}