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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLReturnNode.java @ 13882:afd6fa5e8229

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SL: Feedback from reviewers
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 05 Feb 2014 08:02:15 -0800
parents 64c77f0577bb
children a08b8694f556
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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).
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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14 *
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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15 * You should have received a copy of the GNU General Public License version
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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")
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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 = adoptChild(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 }