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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/InstanceOfSnippets.java @ 6954:0e20ad1ea98b

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removed WordStamp (and a nasty bug associated with its misusage)
author Doug Simon <doug.simon@oracle.com>
date Thu, 15 Nov 2012 21:32:23 +0100
parents 41938af2b3d8
children 89df4e71940a 7d815d842ee0
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1 /*
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2 * Copyright (c) 2012, 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.hotspot.snippets;
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24 import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*;
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25 import static com.oracle.graal.hotspot.snippets.CheckCastSnippets.*;
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26 import static com.oracle.graal.hotspot.snippets.CheckCastSnippets.Templates.*;
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27 import static com.oracle.graal.hotspot.snippets.HotSpotSnippetUtils.*;
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28 import static com.oracle.graal.snippets.SnippetTemplate.Arguments.*;
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29
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30 import com.oracle.graal.api.code.*;
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31 import com.oracle.graal.api.meta.*;
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32 import com.oracle.graal.hotspot.meta.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.java.*;
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35 import com.oracle.graal.nodes.spi.*;
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36 import com.oracle.graal.phases.*;
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37 import com.oracle.graal.snippets.*;
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38 import com.oracle.graal.snippets.Snippet.ConstantParameter;
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39 import com.oracle.graal.snippets.Snippet.Parameter;
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40 import com.oracle.graal.snippets.Snippet.Varargs;
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41 import com.oracle.graal.snippets.Snippet.VarargsParameter;
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42 import com.oracle.graal.snippets.SnippetTemplate.Arguments;
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43 import com.oracle.graal.snippets.SnippetTemplate.Key;
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44 import com.oracle.graal.snippets.nodes.*;
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45
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46 /**
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47 * Snippets used for implementing the type test of an instanceof instruction.
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48 * Since instanceof is a floating node, it is lowered separately for each of
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49 * its usages.
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50 *
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51 * The type tests implemented are described in the paper <a href="http://dl.acm.org/citation.cfm?id=583821">
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52 * Fast subtype checking in the HotSpot JVM</a> by Cliff Click and John Rose.
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53 */
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54 public class InstanceOfSnippets implements SnippetsInterface {
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55
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56 /**
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57 * A test against a final type.
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58 */
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59 @Snippet
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60 public static Object instanceofExact(
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61 @Parameter("object") Object object,
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62 @Parameter("exactHub") Word exactHub,
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63 @Parameter("trueValue") Object trueValue,
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64 @Parameter("falseValue") Object falseValue,
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65 @ConstantParameter("checkNull") boolean checkNull) {
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66 if (checkNull && object == null) {
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67 isNull.inc();
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68 return falseValue;
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69 }
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70 Word objectHub = loadHub(object);
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71 if (objectHub != exactHub) {
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72 exactMiss.inc();
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73 return falseValue;
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74 }
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75 exactHit.inc();
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76 return trueValue;
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77 }
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78
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79 /**
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80 * A test against a primary type.
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81 */
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82 @Snippet
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83 public static Object instanceofPrimary(
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84 @Parameter("hub") Word hub,
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85 @Parameter("object") Object object,
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86 @Parameter("trueValue") Object trueValue,
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87 @Parameter("falseValue") Object falseValue,
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88 @ConstantParameter("checkNull") boolean checkNull,
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89 @ConstantParameter("superCheckOffset") int superCheckOffset) {
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90 if (checkNull && object == null) {
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91 isNull.inc();
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92 return falseValue;
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93 }
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94 Word objectHub = loadHub(object);
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95 if (loadWordFromWord(objectHub, superCheckOffset) != hub) {
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96 displayMiss.inc();
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97 return falseValue;
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98 }
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99 displayHit.inc();
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100 return trueValue;
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101 }
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102
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103 /**
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104 * A test against a restricted secondary type type.
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105 */
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106 @Snippet
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107 public static Object instanceofSecondary(
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108 @Parameter("hub") Word hub,
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109 @Parameter("object") Object object,
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110 @Parameter("trueValue") Object trueValue,
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111 @Parameter("falseValue") Object falseValue,
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112 @VarargsParameter("hints") Word[] hints,
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113 @ConstantParameter("checkNull") boolean checkNull) {
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114 if (checkNull && object == null) {
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115 isNull.inc();
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116 return falseValue;
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117 }
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118 Word objectHub = loadHub(object);
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119 // if we get an exact match: succeed immediately
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120 ExplodeLoopNode.explodeLoop();
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121 for (int i = 0; i < hints.length; i++) {
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122 Word hintHub = hints[i];
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123 if (hintHub == objectHub) {
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124 hintsHit.inc();
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125 return trueValue;
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126 }
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127 }
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128 if (!checkSecondarySubType(hub, objectHub)) {
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129 return falseValue;
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130 }
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131 return trueValue;
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132 }
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133
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134 static boolean checkSecondarySubType(Word t, Word s) {
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135 // if (S.cache == T) return true
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136 if (loadWordFromWord(s, secondarySuperCacheOffset()) == t) {
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137 cacheHit.inc();
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138 return true;
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139 }
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140
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141 // if (T == S) return true
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142 if (s == t) {
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143 T_equals_S.inc();
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144 return true;
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145 }
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146
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147 // if (S.scan_s_s_array(T)) { S.cache = T; return true; }
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148 Word secondarySupers = loadWordFromWord(s, secondarySupersOffset());
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149 int length = loadIntFromWord(secondarySupers, metaspaceArrayLengthOffset());
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150 for (int i = 0; i < length; i++) {
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151 if (t == loadWordElement(secondarySupers, i)) {
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152 DirectObjectStoreNode.storeObject(s, secondarySuperCacheOffset(), 0, t);
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153 secondariesHit.inc();
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154 return true;
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155 }
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156 }
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157 secondariesMiss.inc();
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158 return false;
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159 }
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160
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161 public static class Templates extends InstanceOfSnippetsTemplates<InstanceOfSnippets> {
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162
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163 private final ResolvedJavaMethod instanceofExact;
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164 private final ResolvedJavaMethod instanceofPrimary;
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165 private final ResolvedJavaMethod instanceofSecondary;
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166
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167 public Templates(CodeCacheProvider runtime) {
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168 super(runtime, InstanceOfSnippets.class);
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169 instanceofExact = snippet("instanceofExact", Object.class, Word.class, Object.class, Object.class, boolean.class);
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170 instanceofPrimary = snippet("instanceofPrimary", Word.class, Object.class, Object.class, Object.class, boolean.class, int.class);
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171 instanceofSecondary = snippet("instanceofSecondary", Word.class, Object.class, Object.class, Object.class, Word[].class, boolean.class);
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172 }
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173
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174 @Override
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175 protected KeyAndArguments getKeyAndArguments(InstanceOfUsageReplacer replacer, LoweringTool tool) {
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176 InstanceOfNode instanceOf = replacer.instanceOf;
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177 ValueNode trueValue = replacer.trueValue;
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178 ValueNode falseValue = replacer.falseValue;
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179 ValueNode object = instanceOf.object();
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180 TypeCheckHints hintInfo = new TypeCheckHints(instanceOf.type(), instanceOf.profile(), tool.assumptions(), GraalOptions.InstanceOfMinHintHitProbability, GraalOptions.InstanceOfMaxHints);
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181 final HotSpotResolvedJavaType type = (HotSpotResolvedJavaType) instanceOf.type();
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182 ConstantNode hub = ConstantNode.forConstant(type.klass(), runtime, instanceOf.graph());
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183 boolean checkNull = !object.stamp().nonNull();
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184 Arguments arguments;
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185 Key key;
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186 if (hintInfo.exact) {
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187 ConstantNode[] hints = createHints(hintInfo, runtime, hub.graph());
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188 assert hints.length == 1;
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189 key = new Key(instanceofExact).add("checkNull", checkNull);
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190 arguments = arguments("object", object).add("exactHub", hints[0]).add("trueValue", trueValue).add("falseValue", falseValue);
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191 } else if (type.isPrimaryType()) {
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192 key = new Key(instanceofPrimary).add("checkNull", checkNull).add("superCheckOffset", type.superCheckOffset());
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193 arguments = arguments("hub", hub).add("object", object).add("trueValue", trueValue).add("falseValue", falseValue);
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194 } else {
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195 ConstantNode[] hints = createHints(hintInfo, runtime, hub.graph());
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196 key = new Key(instanceofSecondary).add("hints", Varargs.vargargs(new Word[hints.length], wordStamp())).add("checkNull", checkNull);
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197 arguments = arguments("hub", hub).add("object", object).add("hints", hints).add("trueValue", trueValue).add("falseValue", falseValue);
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198 }
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199 return new KeyAndArguments(key, arguments);
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200 }
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201 }
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202
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203 private static final SnippetCounter.Group counters = GraalOptions.SnippetCounters ? new SnippetCounter.Group("Checkcast") : null;
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204 private static final SnippetCounter hintsHit = new SnippetCounter(counters, "hintsHit", "hit a hint type");
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205 private static final SnippetCounter exactHit = new SnippetCounter(counters, "exactHit", "exact type test succeeded");
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206 private static final SnippetCounter exactMiss = new SnippetCounter(counters, "exactMiss", "exact type test failed");
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207 private static final SnippetCounter isNull = new SnippetCounter(counters, "isNull", "object tested was null");
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208 private static final SnippetCounter cacheHit = new SnippetCounter(counters, "cacheHit", "secondary type cache hit");
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209 private static final SnippetCounter secondariesHit = new SnippetCounter(counters, "secondariesHit", "secondaries scan succeeded");
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210 private static final SnippetCounter secondariesMiss = new SnippetCounter(counters, "secondariesMiss", "secondaries scan failed");
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211 private static final SnippetCounter displayHit = new SnippetCounter(counters, "displayHit", "primary type test succeeded");
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212 private static final SnippetCounter displayMiss = new SnippetCounter(counters, "displayMiss", "primary type test failed");
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213 private static final SnippetCounter T_equals_S = new SnippetCounter(counters, "T_equals_S", "object type was equal to secondary type");
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214 }