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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLIfNode.java @ 13821:b16ec83edc73

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Documentation and more refactoring of Simple Language
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 29 Jan 2014 20:45:43 -0800
parents 7c418666c6c9
children 64c77f0577bb
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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
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).
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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.dsl.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.api.nodes.*;
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28 import com.oracle.truffle.api.utilities.*;
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29 import com.oracle.truffle.sl.nodes.*;
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30
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31 @NodeInfo(shortName = "if")
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32 public class SLIfNode extends SLStatementNode {
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33 @Child private SLExpressionNode conditionNode;
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34 @Child private SLStatementNode thenPartNode;
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35 @Child private SLStatementNode elsePartNode;
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36
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37 private final BranchProfile thenTaken = new BranchProfile();
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38 private final BranchProfile elseTaken = new BranchProfile();
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39
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40 public SLIfNode(SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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41 this.conditionNode = adoptChild(conditionNode);
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42 this.thenPartNode = adoptChild(thenPartNode);
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43 this.elsePartNode = adoptChild(elsePartNode);
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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 if (evaluateCondition(frame)) {
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49 thenTaken.enter();
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50 thenPartNode.executeVoid(frame);
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51 } else {
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52 if (elsePartNode != null) {
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53 elseTaken.enter();
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54 elsePartNode.executeVoid(frame);
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55 }
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56 }
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57 }
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58
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59 private boolean evaluateCondition(VirtualFrame frame) {
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60 try {
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61 /*
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62 * The condition must evaluate to a boolean value, so we call boolean-specialized
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63 * method.
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64 */
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65 return conditionNode.executeBoolean(frame);
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66 } catch (UnexpectedResultException ex) {
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67 /*
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68 * The condition evaluated to a non-boolean result. This is a type error in the SL
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69 * program. We report it with the same exception that Truffle DSL generated nodes use to
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70 * report type errors.
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71 */
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72 throw new UnsupportedSpecializationException(this, ex.getResult());
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73 }
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74 }
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75 }