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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnsafeCastNode.java @ 15009:e49f62425090

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introduce non-ValueNode Proxy interface
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 07 Apr 2014 13:55:45 +0200
parents d5a1206e1923
children d44e138f7020
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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.extended;
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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.graph.spi.*;
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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
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32 /**
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33 * The {@code UnsafeCastNode} produces the same value as its input, but with a different type. It
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34 * allows unsafe casts "sideways" in the type hierarchy. It does not allow to "drop" type
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35 * information, i.e., an unsafe cast is removed if the input object has a more precise or equal type
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36 * than the type this nodes casts to.
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37 */
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38 public class UnsafeCastNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, GuardingNode, IterableNodeType, Canonicalizable, ValueProxy {
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39
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40 @Input private ValueNode object;
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41
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42 public UnsafeCastNode(ValueNode object, Stamp stamp) {
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43 super(stamp);
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44 this.object = object;
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45 }
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46
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47 public UnsafeCastNode(ValueNode object, Stamp stamp, ValueNode anchor) {
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48 super(stamp, (GuardingNode) anchor);
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49 this.object = object;
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50 }
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51
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52 public UnsafeCastNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) {
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53 this(object, toType.getKind() == Kind.Object ? StampFactory.object(toType, exactType, nonNull || ObjectStamp.isObjectNonNull(object.stamp())) : StampFactory.forKind(toType.getKind()));
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54 }
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55
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56 @Override
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57 public ValueNode getOriginalNode() {
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58 return object;
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59 }
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60
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61 @Override
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62 public Node canonical(CanonicalizerTool tool) {
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63 assert getKind() == Kind.Object && object.getKind() == Kind.Object;
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64
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65 ObjectStamp my = (ObjectStamp) stamp();
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66 ObjectStamp other = (ObjectStamp) object.stamp();
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67
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68 if (my.type() == null || other.type() == null) {
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69 return this;
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70 }
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71 if (my.isExactType() && !other.isExactType()) {
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72 return this;
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73 }
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74 if (my.nonNull() && !other.nonNull()) {
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75 return this;
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76 }
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77 if (!my.type().isAssignableFrom(other.type())) {
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78 return this;
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79 }
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80 /*
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81 * The unsafe cast does not add any new type information, so it can be removed. Note that
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82 * this means that the unsafe cast cannot be used to "drop" type information (in which case
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83 * it must not be canonicalized in any case).
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84 */
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85 return object;
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86 }
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87
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88 @Override
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89 public void virtualize(VirtualizerTool tool) {
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90 State state = tool.getObjectState(object);
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91 if (state != null && state.getState() == EscapeState.Virtual && ObjectStamp.typeOrNull(this) != null && ObjectStamp.typeOrNull(this).isAssignableFrom(state.getVirtualObject().type())) {
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92 tool.replaceWithVirtual(state.getVirtualObject());
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93 }
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94 }
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95
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96 @Override
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97 public void generate(NodeLIRBuilderTool generator) {
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98 assert getKind() == Kind.Object && object.getKind() == Kind.Object;
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99 /*
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100 * The LIR only cares about the kind of an operand, not the actual type of an object. So we
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101 * do not have to introduce a new operand.
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102 */
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103 generator.setResult(this, generator.operand(object));
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104 }
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105 }