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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ValueAnchorNode.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/extended/ValueAnchorNode.java@4ed4295ce15f
children f8fe72ce4adc
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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.extended;
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24
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25 import com.oracle.max.cri.ci.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.calc.*;
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29 import com.oracle.graal.nodes.spi.*;
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30 import com.oracle.graal.nodes.type.*;
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32 /**
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33 * The ValueAnchor instruction keeps non-CFG (floating) nodes above a certain point in the graph.
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34 */
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35
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36 public final class ValueAnchorNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable, Node.IterableNodeType {
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38 @Input private ValueNode object;
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39
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40 public ValueNode object() {
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41 return object;
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42 }
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43
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44 public ValueAnchorNode(ValueNode object) {
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45 super(StampFactory.illegal());
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46 this.object = object;
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47 }
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48
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49 @Override
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50 public void generate(LIRGeneratorTool gen) {
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51 // Nothing to emit, since this is node is used for structural purposes only.
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52 }
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53
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54 @Override
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55 public ValueNode canonical(CanonicalizerTool tool) {
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56 if (object == null) {
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57 return null;
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58 }
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59 if (object instanceof ConstantNode) {
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60 return null;
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61 }
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62 if (object instanceof IntegerDivNode || object instanceof IntegerRemNode) {
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63 if (((ArithmeticNode) object).y().isConstant()) {
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64 CiConstant constant = ((ArithmeticNode) object).y().asConstant();
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65 assert constant.kind == object.kind() : constant.kind + " != " + object.kind();
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66 if (constant.asLong() != 0) {
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67 return null;
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68 }
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69 }
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70 }
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71 return this;
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72 }
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73 }