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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastDynamicNode.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents 14e703edb2ab
children
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1 /*
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2 * Copyright (c) 2009, 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
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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.graph.*;
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26 import com.oracle.graal.graph.spi.*;
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27 import com.oracle.graal.nodeinfo.*;
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28 import com.oracle.graal.nodes.*;
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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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31 import com.oracle.jvmci.meta.*;
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32
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33 /**
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34 * Implements a type check where the type being checked is loaded at runtime. This is used, for
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35 * instance, to implement an object array store check.
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36 */
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37 @NodeInfo
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38 public final class CheckCastDynamicNode extends FixedWithNextNode implements Canonicalizable.Binary<ValueNode>, Lowerable {
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39
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40 public static final NodeClass<CheckCastDynamicNode> TYPE = NodeClass.create(CheckCastDynamicNode.class);
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41 @Input ValueNode object;
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42 @Input ValueNode hub;
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43
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44 /**
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45 * Determines the exception thrown by this node if the check fails: {@link ClassCastException}
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46 * if false; {@link ArrayStoreException} if true.
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47 */
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48 protected final boolean forStoreCheck;
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49
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50 public CheckCastDynamicNode(ValueNode hub, ValueNode object, boolean forStoreCheck) {
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51 super(TYPE, object.stamp());
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52 this.hub = hub;
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53 this.object = object;
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54 this.forStoreCheck = forStoreCheck;
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55 }
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56
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57 public ValueNode object() {
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58 return object;
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59 }
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60
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61 /**
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62 * Gets the runtime-loaded type being cast to.
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63 */
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64 public ValueNode hub() {
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65 return hub;
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66 }
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67
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68 public ValueNode getX() {
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69 return object;
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70 }
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71
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72 public ValueNode getY() {
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73 return hub;
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74 }
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75
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76 public boolean isForStoreCheck() {
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77 return forStoreCheck;
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78 }
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79
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80 @Override
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81 public void lower(LoweringTool tool) {
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82 tool.getLowerer().lower(this, tool);
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83 }
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84
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85 @Override
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86 public boolean inferStamp() {
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87 return updateStamp(object().stamp());
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88 }
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89
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90 @Override
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91 public ValueNode canonical(CanonicalizerTool tool, ValueNode forObject, ValueNode forHub) {
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92 if (StampTool.isPointerAlwaysNull(forObject)) {
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93 return forObject;
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94 }
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95 if (forHub.isConstant()) {
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96 ResolvedJavaType t = tool.getConstantReflection().asJavaType(forHub.asConstant());
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97 if (t != null) {
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98 return new CheckCastNode(t, forObject, null, forStoreCheck);
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99 }
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100 }
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101 return this;
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102 }
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103 }