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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastDynamicNode.java @ 11265:ef6915cf1e59

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Add illegal stamp Remove ValueNode.(object|integer)Stamp: use explicit tests/casts Fix ObjectStamp.join Introduce ObjectStamp.castTo Add some tests for ObjectStamp.join
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 08 Aug 2013 18:17:47 +0200
parents 422b0e9b9aed
children ae619d70bf4b
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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
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31 /**
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32 * Implements a type check where the type being checked is loaded at runtime. This is used, for
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33 * instance, to implement an object array store check.
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34 */
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35 public final class CheckCastDynamicNode extends FixedWithNextNode implements Canonicalizable, Lowerable, Node.IterableNodeType {
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36
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37 @Input private ValueNode object;
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38 @Input private ValueNode hub;
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39
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40 /**
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41 * Determines the exception thrown by this node if the check fails: {@link ClassCastException}
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42 * if false; {@link ArrayStoreException} if true.
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43 */
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44 private final boolean forStoreCheck;
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45
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46 /**
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47 * @param hub the type being cast to
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48 * @param object the object being cast
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49 */
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50 public CheckCastDynamicNode(ValueNode hub, ValueNode object, boolean forStoreCheck) {
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51 super(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 boolean isForStoreCheck() {
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58 return forStoreCheck;
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59 }
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60
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61 @Override
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62 public void lower(LoweringTool tool, LoweringType loweringType) {
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63 tool.getRuntime().lower(this, tool);
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64 }
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65
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66 @Override
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67 public boolean inferStamp() {
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68 return updateStamp(object().stamp());
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69 }
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70
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71 @Override
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72 public ValueNode canonical(CanonicalizerTool tool) {
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73 assert object() != null : this;
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74
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75 if (ObjectStamp.isObjectAlwaysNull(object())) {
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76 return object();
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77 }
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78 if (hub.isConstant() && hub.kind() == Kind.Object && hub.asConstant().asObject() instanceof Class) {
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79 Class clazz = (Class) hub.asConstant().asObject();
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80 ResolvedJavaType t = tool.runtime().lookupJavaType(clazz);
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81 return graph().add(new CheckCastNode(t, object(), null, forStoreCheck));
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82 }
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83 return this;
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84 }
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85
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86 public ValueNode object() {
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87 return object;
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88 }
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89
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90 /**
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91 * Gets the runtime-loaded type being cast to.
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92 */
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93 public ValueNode hub() {
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94 return hub;
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95 }
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96
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97 @NodeIntrinsic
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98 public static native <T> T checkCastDynamic(Class<T> type, Object object, @ConstantNodeParameter boolean forStoreCheck);
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99 }