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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLReturnNode.java @ 21951:9c8c0937da41

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Moving all sources into truffle subdirectory
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 17 Jun 2015 10:58:08 +0200
parents graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLReturnNode.java@abe7128ca473
children c07e64ecb528
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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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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.api.source.*;
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28 import com.oracle.truffle.sl.nodes.*;
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29 import com.oracle.truffle.sl.runtime.*;
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30
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31 /**
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32 * Implementation of the SL return statement. We need to unwind an unknown number of interpreter
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33 * frames that are between this {@link SLReturnNode} and the {@link SLFunctionBodyNode} of the
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34 * method we are exiting. This is done by throwing an {@link SLReturnException exception} that is
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35 * caught by the {@link SLFunctionBodyNode#executeGeneric function body}. The exception transports
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36 * the return value.
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37 */
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38 @NodeInfo(shortName = "return", description = "The node implementing a return statement")
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39 public final class SLReturnNode extends SLStatementNode {
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40
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41 @Child private SLExpressionNode valueNode;
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42
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43 public SLReturnNode(SourceSection src, SLExpressionNode valueNode) {
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44 super(src);
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45 this.valueNode = valueNode;
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46 }
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47
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48 @Override
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49 public void executeVoid(VirtualFrame frame) {
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50 Object result;
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51 if (valueNode != null) {
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52 result = valueNode.executeGeneric(frame);
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53 } else {
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54 /* Return statement that was not followed by an expression, so return the SL null value. */
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55 result = SLNull.SINGLETON;
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56 }
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57 throw new SLReturnException(result);
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58 }
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59 }