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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnsafeCastNode.java @ 10040:6b34d50d3d24

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Remove PiNode.anchor, use the guard field of FloatingGuardedNode instead
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 14 Jun 2013 11:16:41 +0200
parents 6c1f7b853d35
children ef6915cf1e59
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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.nodes.*;
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27 import com.oracle.graal.nodes.spi.*;
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28 import com.oracle.graal.nodes.type.*;
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29
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30 /**
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31 * The {@code UnsafeCastNode} produces the same value as its input, but with a different type.
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32 */
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33 public class UnsafeCastNode extends PiNode implements Canonicalizable, LIRLowerable {
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34
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35 public UnsafeCastNode(ValueNode object, Stamp stamp) {
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36 super(object, stamp);
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37 }
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38
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39 public UnsafeCastNode(ValueNode object, Stamp stamp, GuardingNode anchor) {
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40 super(object, stamp, anchor);
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41 }
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42
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43 public UnsafeCastNode(ValueNode object, Stamp stamp, ValueNode anchor) {
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44 this(object, stamp, (GuardingNode) anchor);
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45 }
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46
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47 public UnsafeCastNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) {
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48 this(object, toType.getKind() == Kind.Object ? StampFactory.object(toType, exactType, nonNull || object.stamp().nonNull()) : StampFactory.forKind(toType.getKind()));
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49 }
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50
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51 @Override
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52 public boolean inferStamp() {
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53 if (kind() != Kind.Object || object().kind() != Kind.Object) {
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54 return false;
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55 }
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56 if (stamp() == StampFactory.forNodeIntrinsic()) {
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57 return false;
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58 }
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59 return updateStamp(stamp().join(object().stamp()));
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60 }
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61
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62 @Override
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63 public ValueNode canonical(CanonicalizerTool tool) {
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64 if (kind() != object().kind()) {
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65 return this;
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66 }
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67
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68 if (kind() == Kind.Object) {
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69 ObjectStamp my = objectStamp();
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70 ObjectStamp other = object().objectStamp();
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71
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72 if (my.type() == null || other.type() == null) {
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73 return this;
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74 }
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75 if (my.isExactType() && !other.isExactType()) {
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76 return this;
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77 }
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78 if (my.nonNull() && !other.nonNull()) {
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79 return this;
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80 }
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81 if (!my.type().isAssignableFrom(other.type())) {
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82 return this;
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83 }
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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 generate(LIRGeneratorTool generator) {
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90 if (kind() != object().kind()) {
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91 assert generator.target().arch.getSizeInBytes(kind()) == generator.target().arch.getSizeInBytes(object().kind()) : "unsafe cast cannot be used to change the size of a value";
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92 AllocatableValue result = generator.newVariable(kind());
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93 generator.emitMove(result, generator.operand(object()));
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94 generator.setResult(this, result);
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95 } else {
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96 // The LIR only cares about the kind of an operand, not the actual type of an object. So
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97 // we do not have to
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98 // introduce a new operand when the kind is the same.
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99 generator.setResult(this, generator.operand(object()));
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100 }
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101 }
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102
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103 @NodeIntrinsic
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104 public static native <T> T unsafeCast(Object object, @ConstantNodeParameter Stamp stamp);
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105
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106 @NodeIntrinsic
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107 public static native <T> T unsafeCast(Object object, @ConstantNodeParameter Stamp stamp, GuardingNode anchor);
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108
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109 @SuppressWarnings("unused")
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110 @NodeIntrinsic
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111 public static <T> T unsafeCast(Object object, @ConstantNodeParameter Class<T> toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull) {
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112 return toType.cast(object);
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113 }
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114 }