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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/IndexedLocationNode.java @ 5501:d89b20486d87

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Renaming CiConstant => RiConstant.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 17:07:05 +0200
parents af07e798947d
children 13aee5aba8cc
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1 /*
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2 * Copyright (c) 2011, 2012, 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.spi.*;
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29
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30 /**
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31 * Extension of a {@linkplain LocationNode location} to include a scaled index or an additional offset.
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32 */
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33 public final class IndexedLocationNode extends LocationNode implements LIRLowerable, Canonicalizable {
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34
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35 /**
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36 * An offset or index depending on whether {@link #indexScalingEnabled} is true or false respectively.
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37 */
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38 @Input private ValueNode index;
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39 private final boolean indexScalingEnabled;
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40
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41 /**
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42 * Gets the index or offset of this location.
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43 */
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44 public ValueNode index() {
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45 return index;
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46 }
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47
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48 public static Object getArrayLocation(CiKind elementKind) {
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49 return elementKind;
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50 }
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51
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52 /**
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53 * @return whether scaling of the index by the value kind's size is enabled (the default) or disabled.
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54 */
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55 public boolean indexScalingEnabled() {
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56 return indexScalingEnabled;
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57 }
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58
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59 public static IndexedLocationNode create(Object identity, CiKind kind, int displacement, ValueNode index, Graph graph, boolean indexScalingEnabled) {
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60 return graph.unique(new IndexedLocationNode(identity, kind, index, displacement, indexScalingEnabled));
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61 }
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62
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63 private IndexedLocationNode(Object identity, CiKind kind, ValueNode index, int displacement, boolean indexScalingEnabled) {
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64 super(identity, kind, displacement);
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65 this.index = index;
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66 this.indexScalingEnabled = indexScalingEnabled;
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67 }
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68
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69 @Override
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70 public ValueNode canonical(CanonicalizerTool tool) {
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71 RiConstant constantIndex = index.asConstant();
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72 if (constantIndex != null && constantIndex.kind.stackKind().isInt()) {
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73 long constantIndexLong = constantIndex.asInt();
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74 if (indexScalingEnabled) {
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75 if (tool.target() == null) {
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76 return this;
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77 }
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78 constantIndexLong *= tool.target().sizeInBytes(getValueKind());
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79 }
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80 constantIndexLong += displacement();
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81 int constantIndexInt = (int) constantIndexLong;
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82 if (constantIndexLong == constantIndexInt) {
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83 return LocationNode.create(locationIdentity(), getValueKind(), constantIndexInt, graph());
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84 }
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85 }
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86 return this;
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87 }
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88 }