Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLReturnNode.java @ 15989:f62cc9f09c7b
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author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 02 Jun 2014 17:09:51 +0200 |
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1 /* |
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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Simple Language: A simple dynamic programming language to demonstrate Truffle features
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.sl.nodes.controlflow; |
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24 |
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25 import com.oracle.truffle.api.frame.*; |
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26 import com.oracle.truffle.api.nodes.*; |
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27 import com.oracle.truffle.sl.nodes.*; |
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28 import com.oracle.truffle.sl.runtime.*; |
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29 |
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30 /** |
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31 * Implementation of the SL return statement. We need to unwind an unknown number of interpreter |
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32 * frames that are between this {@link SLReturnNode} and the {@link SLFunctionBodyNode} of the |
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33 * method we are exiting. This is done by throwing an {@link SLReturnException exception} that is |
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34 * caught by the {@link SLFunctionBodyNode#executeGeneric function body}. The exception transports |
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35 * the return value. |
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36 */ |
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37 @NodeInfo(shortName = "return", description = "The node implementing a return statement") |
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38 public final class SLReturnNode extends SLStatementNode { |
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39 |
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40 @Child private SLExpressionNode valueNode; |
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41 |
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42 public SLReturnNode(SLExpressionNode valueNode) { |
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43 this.valueNode = valueNode; |
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44 } |
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45 |
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46 @Override |
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47 public void executeVoid(VirtualFrame frame) { |
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48 Object result; |
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49 if (valueNode != null) { |
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50 result = valueNode.executeGeneric(frame); |
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51 } else { |
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52 /* Return statement that was not followed by an expression, so return the SL null value. */ |
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53 result = SLNull.SINGLETON; |
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54 } |
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55 throw new SLReturnException(result); |
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56 } |
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57 } |