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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/LoadFieldNode.java @ 10817:2c9332a969d6

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made it possible to use enum constants in snippets
author Doug Simon <doug.simon@oracle.com>
date Fri, 19 Jul 2013 17:47:35 +0200
parents eef9281ec13b
children 4da2141fc40f
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1 /*
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2 * Copyright (c) 2009, 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.java;
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24
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25 import com.oracle.graal.api.meta.*;
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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 import com.oracle.graal.nodes.type.*;
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30 import com.oracle.graal.nodes.virtual.*;
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32 /**
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33 * The {@code LoadFieldNode} represents a read of a static or instance field.
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34 */
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35 @NodeInfo(nameTemplate = "LoadField#{p#field/s}")
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36 public final class LoadFieldNode extends AccessFieldNode implements Canonicalizable, Node.IterableNodeType, VirtualizableRoot {
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37
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38 /**
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39 * Creates a new LoadFieldNode instance.
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40 *
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41 * @param object the receiver object
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42 * @param field the compiler interface field
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43 */
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44 public LoadFieldNode(ValueNode object, ResolvedJavaField field) {
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45 super(createStamp(field), object, field);
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46 }
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47
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48 private static Stamp createStamp(ResolvedJavaField field) {
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49 Kind kind = field.getKind();
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50 if (kind == Kind.Object && field.getType() instanceof ResolvedJavaType) {
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51 return StampFactory.declared((ResolvedJavaType) field.getType());
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52 } else {
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53 return StampFactory.forKind(kind);
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54 }
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55 }
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56
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57 @Override
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58 public ValueNode canonical(CanonicalizerTool tool) {
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59 MetaAccessProvider runtime = tool.runtime();
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60 if (tool.canonicalizeReads()) {
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61 ConstantNode constant = asConstant(runtime);
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62 if (constant != null) {
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63 return constant;
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64 }
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65 }
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66 return this;
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67 }
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68
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69 /**
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70 * Gets a constant value for this load if possible.
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71 */
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72 public ConstantNode asConstant(MetaAccessProvider runtime) {
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73 if (runtime != null) {
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74 Constant constant = null;
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75 if (isStatic()) {
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76 constant = field().readConstantValue(null);
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77 } else if (object().isConstant() && !object().isNullConstant()) {
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78 constant = field().readConstantValue(object().asConstant());
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79 }
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80 if (constant != null) {
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81 return ConstantNode.forConstant(constant, runtime, graph());
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82 }
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83 }
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84 return null;
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85 }
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86
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87 @Override
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88 public void virtualize(VirtualizerTool tool) {
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89 State state = tool.getObjectState(object());
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90 if (state != null && state.getState() == EscapeState.Virtual) {
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91 int fieldIndex = ((VirtualInstanceNode) state.getVirtualObject()).fieldIndex(field());
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92 if (fieldIndex != -1) {
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93 tool.replaceWith(state.getEntry(fieldIndex));
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94 }
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95 }
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96 }
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97 }