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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampTool.java @ 20074:a7ee2e1f0d4e

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remove UnboxNodes without usages (if object is non-null)
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 30 Mar 2015 13:59:59 +0200
parents 1b7dbb81df4f
children 35e1b66f2810
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1 /*
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2 * Copyright (c) 2012, 2015, 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.type;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.nodes.*;
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30
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31 /**
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32 * Helper class that is used to keep all stamp-related operations in one place.
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33 */
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34 public class StampTool {
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35
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36 public static Stamp meet(Collection<? extends ValueNode> values) {
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37 Iterator<? extends ValueNode> iterator = values.iterator();
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38 if (iterator.hasNext()) {
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39 Stamp stamp = iterator.next().stamp();
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40 while (iterator.hasNext()) {
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41 stamp = stamp.meet(iterator.next().stamp());
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42 }
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43 return stamp;
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44 } else {
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45 return StampFactory.forVoid();
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46 }
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47 }
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48
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49 /**
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50 * Compute the stamp resulting from the unsigned comparison being true.
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51 *
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52 * @return null if it's can't be true or it nothing useful can be encoded.
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53 */
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54 public static Stamp unsignedCompare(Stamp stamp, Stamp stamp2) {
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55 IntegerStamp x = (IntegerStamp) stamp;
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56 IntegerStamp y = (IntegerStamp) stamp2;
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57 if (x == x.unrestricted() && y == y.unrestricted()) {
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58 // Don't know anything.
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59 return null;
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60 }
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61 // c <| n, where c is a constant and n is known to be positive.
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62 if (x.lowerBound() == x.upperBound()) {
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63 if (y.isPositive()) {
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64 if (x.lowerBound() == (1 << x.getBits()) - 1) {
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65 // Constant is MAX_VALUE which must fail.
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66 return null;
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67 }
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68 if (x.lowerBound() <= y.lowerBound()) {
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69 // Test will fail. Return illegalStamp instead?
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70 return null;
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71 }
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72 // If the test succeeds then this proves that n is at greater than c so the bounds
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73 // are [c+1..-n.upperBound)].
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74 return StampFactory.forInteger(x.getBits(), x.lowerBound() + 1, y.upperBound());
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75 }
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76 return null;
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77 }
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78 // n <| c, where c is a strictly positive constant
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79 if (y.lowerBound() == y.upperBound() && y.isStrictlyPositive()) {
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80 // The test proves that n is positive and less than c, [0..c-1]
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81 return StampFactory.forInteger(y.getBits(), 0, y.lowerBound() - 1);
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82 }
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83 return null;
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84 }
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85
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86 /**
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87 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} pointer
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88 * value which is known to be always null.
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89 *
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90 * @param node the node to check
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91 * @return true if this node represents a legal object value which is known to be always null
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92 */
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93 public static boolean isPointerAlwaysNull(ValueNode node) {
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94 return isPointerAlwaysNull(node.stamp());
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95 }
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96
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97 /**
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98 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} pointer
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99 * stamp whose values are known to be always null.
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100 *
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101 * @param stamp the stamp to check
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102 * @return true if this stamp represents a legal object stamp whose values are known to be
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103 * always null
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104 */
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105 public static boolean isPointerAlwaysNull(Stamp stamp) {
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106 if (stamp instanceof AbstractPointerStamp && stamp.isLegal()) {
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107 return ((AbstractPointerStamp) stamp).alwaysNull();
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108 }
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109 return false;
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110 }
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111
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112 /**
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113 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} pointer
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114 * value which is known to never be null.
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115 *
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116 * @param node the node to check
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117 * @return true if this node represents a legal object value which is known to never be null
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118 */
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119 public static boolean isPointerNonNull(ValueNode node) {
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120 return isPointerNonNull(node.stamp());
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121 }
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122
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123 /**
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124 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} pointer
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125 * stamp whose values are known to never be null.
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126 *
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127 * @param stamp the stamp to check
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128 * @return true if this stamp represents a legal object stamp whose values are known to be
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129 * always null
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130 */
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131 public static boolean isPointerNonNull(Stamp stamp) {
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132 if (stamp instanceof AbstractPointerStamp && stamp.isLegal()) {
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133 return ((AbstractPointerStamp) stamp).nonNull();
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134 }
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135 return false;
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136 }
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137
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138 /**
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139 * Returns the {@linkplain ResolvedJavaType Java type} this {@linkplain ValueNode} has if it is
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140 * a {@linkplain Stamp#isLegal() legal} Object value.
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141 *
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142 * @param node the node to check
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143 * @return the Java type this value has if it is a legal Object type, null otherwise
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144 */
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145 public static ResolvedJavaType typeOrNull(ValueNode node) {
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146 return typeOrNull(node.stamp());
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147 }
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148
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149 /**
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150 * Returns the {@linkplain ResolvedJavaType Java type} this {@linkplain Stamp} has if it is a
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151 * {@linkplain Stamp#isLegal() legal} Object stamp.
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152 *
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153 * @param stamp the stamp to check
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154 * @return the Java type this stamp has if it is a legal Object stamp, null otherwise
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155 */
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156 public static ResolvedJavaType typeOrNull(Stamp stamp) {
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157 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
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158 return ((AbstractObjectStamp) stamp).type();
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159 }
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160 return null;
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161 }
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162
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163 /**
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164 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} Object
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165 * value whose Java type is known exactly. If this method returns true then the
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166 * {@linkplain ResolvedJavaType Java type} returned by {@link #typeOrNull(ValueNode)} is the
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167 * concrete dynamic/runtime Java type of this value.
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168 *
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169 * @param node the node to check
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170 * @return true if this node represents a legal object value whose Java type is known exactly
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171 */
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172 public static boolean isExactType(ValueNode node) {
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173 return isExactType(node.stamp());
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174 }
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175
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176 /**
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177 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} Object
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178 * stamp whose {@linkplain ResolvedJavaType Java type} is known exactly. If this method returns
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179 * true then the Java type returned by {@link #typeOrNull(Stamp)} is the only concrete
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180 * dynamic/runtime Java type possible for values of this stamp.
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181 *
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182 * @param stamp the stamp to check
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183 * @return true if this node represents a legal object stamp whose Java type is known exactly
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184 */
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185 public static boolean isExactType(Stamp stamp) {
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186 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
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187 return ((AbstractObjectStamp) stamp).isExactType();
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188 }
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189 return false;
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190 }
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191 }