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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardNode.java @ 5061:e808627bd16f

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Renamed projects.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 08 Mar 2012 19:24:17 +0100
parents graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/GuardNode.java@4ed4295ce15f
children f29e75070bb6 6766253384bf
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1 /*
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2 * Copyright (c) 2011, 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.graal.nodes;
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24
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25 import com.oracle.graal.nodes.calc.*;
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26 import com.oracle.graal.nodes.spi.*;
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27 import com.oracle.graal.nodes.type.*;
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29 public final class GuardNode extends FloatingNode implements Canonicalizable, LIRLowerable {
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31 @Input private BooleanNode condition;
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32 @Input(notDataflow = true) private FixedNode anchor;
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33
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34 public FixedNode anchor() {
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35 return anchor;
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36 }
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38 public void setAnchor(FixedNode x) {
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39 updateUsages(anchor, x);
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40 anchor = x;
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41 }
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42
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43 /**
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44 * The instruction that produces the tested boolean value.
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45 */
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46 public BooleanNode condition() {
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47 return condition;
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48 }
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49
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50 public GuardNode(BooleanNode condition, FixedNode anchor) {
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51 super(StampFactory.illegal());
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52 this.condition = condition;
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53 this.anchor = anchor;
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54 }
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55
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56 @Override
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57 public void generate(LIRGeneratorTool gen) {
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58 gen.emitGuardCheck(condition());
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59 }
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61 @Override
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62 public ValueNode canonical(CanonicalizerTool tool) {
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63 if (condition() instanceof ConstantNode) {
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64 ConstantNode c = (ConstantNode) condition();
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65 if (c.asConstant().asBoolean()) {
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66 this.replaceAtUsages(null);
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67 return null;
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68 }
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69 }
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70 return this;
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71 }
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72 }