Mercurial > hg > truffle
annotate test/compiler/whitebox/CompilerWhiteBoxTest.java @ 20359:4d3a43351904
Merge
author | tschatzl |
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date | Wed, 27 Aug 2014 09:36:55 +0200 |
parents | 5e6f84e7a942 |
children | 52b4284cb496 c88a4554854c |
rev | line source |
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8051 | 1 /* |
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
8051 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 | |
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24 import com.sun.management.HotSpotDiagnosticMXBean; |
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25 import com.sun.management.VMOption; |
8051 | 26 import sun.hotspot.WhiteBox; |
17817 | 27 import sun.hotspot.code.NMethod; |
8051 | 28 import sun.management.ManagementFactoryHelper; |
29 | |
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30 import java.lang.reflect.Constructor; |
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31 import java.lang.reflect.Executable; |
8051 | 32 import java.lang.reflect.Method; |
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33 import java.util.Objects; |
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34 import java.util.concurrent.Callable; |
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35 import java.util.function.Function; |
8051 | 36 |
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37 /** |
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38 * Abstract class for WhiteBox testing of JIT. |
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39 * |
8051 | 40 * @author igor.ignatyev@oracle.com |
41 */ | |
42 public abstract class CompilerWhiteBoxTest { | |
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43 /** {@code CompLevel::CompLevel_none} -- Interpreter */ |
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44 protected static int COMP_LEVEL_NONE = 0; |
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45 /** {@code CompLevel::CompLevel_any}, {@code CompLevel::CompLevel_all} */ |
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46 protected static int COMP_LEVEL_ANY = -1; |
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47 /** {@code CompLevel::CompLevel_simple} -- C1 */ |
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48 protected static int COMP_LEVEL_SIMPLE = 1; |
12073 | 49 /** {@code CompLevel::CompLevel_limited_profile} -- C1, invocation & backedge counters */ |
50 protected static int COMP_LEVEL_LIMITED_PROFILE = 2; | |
51 /** {@code CompLevel::CompLevel_full_profile} -- C1, invocation & backedge counters + mdo */ | |
52 protected static int COMP_LEVEL_FULL_PROFILE = 3; | |
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53 /** {@code CompLevel::CompLevel_full_optimization} -- C2 or Shark */ |
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54 protected static int COMP_LEVEL_FULL_OPTIMIZATION = 4; |
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55 /** Maximal value for CompLevel */ |
12073 | 56 protected static int COMP_LEVEL_MAX = COMP_LEVEL_FULL_OPTIMIZATION; |
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57 |
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58 /** Instance of WhiteBox */ |
8051 | 59 protected static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
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60 /** Value of {@code -XX:CompileThreshold} */ |
8051 | 61 protected static final int COMPILE_THRESHOLD |
62 = Integer.parseInt(getVMOption("CompileThreshold", "10000")); | |
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63 /** Value of {@code -XX:BackgroundCompilation} */ |
8766 | 64 protected static final boolean BACKGROUND_COMPILATION |
65 = Boolean.valueOf(getVMOption("BackgroundCompilation", "true")); | |
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66 /** Value of {@code -XX:TieredCompilation} */ |
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67 protected static final boolean TIERED_COMPILATION |
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68 = Boolean.valueOf(getVMOption("TieredCompilation", "false")); |
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69 /** Value of {@code -XX:TieredStopAtLevel} */ |
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70 protected static final int TIERED_STOP_AT_LEVEL |
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71 = Integer.parseInt(getVMOption("TieredStopAtLevel", "0")); |
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72 /** Flag for verbose output, true if {@code -Dverbose} specified */ |
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73 protected static final boolean IS_VERBOSE |
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74 = System.getProperty("verbose") != null; |
12073 | 75 /** count of invocation to triger compilation */ |
76 protected static final int THRESHOLD; | |
77 /** count of invocation to triger OSR compilation */ | |
78 protected static final long BACKEDGE_THRESHOLD; | |
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79 /** Value of {@code java.vm.info} (interpreted|mixed|comp mode) */ |
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80 protected static final String MODE = System.getProperty("java.vm.info"); |
12073 | 81 |
82 static { | |
83 if (TIERED_COMPILATION) { | |
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84 BACKEDGE_THRESHOLD = THRESHOLD = 150000; |
12073 | 85 } else { |
86 THRESHOLD = COMPILE_THRESHOLD; | |
87 BACKEDGE_THRESHOLD = COMPILE_THRESHOLD * Long.parseLong(getVMOption( | |
88 "OnStackReplacePercentage")); | |
89 } | |
90 } | |
8051 | 91 |
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92 /** |
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93 * Returns value of VM option. |
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94 * |
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95 * @param name option's name |
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96 * @return value of option or {@code null}, if option doesn't exist |
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97 * @throws NullPointerException if name is null |
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98 */ |
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99 protected static String getVMOption(String name) { |
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100 Objects.requireNonNull(name); |
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101 HotSpotDiagnosticMXBean diagnostic |
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102 = ManagementFactoryHelper.getDiagnosticMXBean(); |
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103 VMOption tmp; |
8051 | 104 try { |
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105 tmp = diagnostic.getVMOption(name); |
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106 } catch (IllegalArgumentException e) { |
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107 tmp = null; |
8051 | 108 } |
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109 return (tmp == null ? null : tmp.getValue()); |
8051 | 110 } |
111 | |
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112 /** |
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113 * Returns value of VM option or default value. |
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114 * |
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115 * @param name option's name |
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116 * @param defaultValue default value |
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117 * @return value of option or {@code defaultValue}, if option doesn't exist |
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118 * @throws NullPointerException if name is null |
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119 * @see #getVMOption(String) |
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120 */ |
8766 | 121 protected static String getVMOption(String name, String defaultValue) { |
122 String result = getVMOption(name); | |
8051 | 123 return result == null ? defaultValue : result; |
124 } | |
125 | |
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126 /** copy of is_c1_compile(int) from utilities/globalDefinitions.hpp */ |
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127 protected static boolean isC1Compile(int compLevel) { |
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128 return (compLevel > COMP_LEVEL_NONE) |
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129 && (compLevel < COMP_LEVEL_FULL_OPTIMIZATION); |
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130 } |
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131 |
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132 /** copy of is_c2_compile(int) from utilities/globalDefinitions.hpp */ |
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133 protected static boolean isC2Compile(int compLevel) { |
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134 return compLevel == COMP_LEVEL_FULL_OPTIMIZATION; |
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135 } |
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136 |
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137 protected static void main( |
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138 Function<TestCase, CompilerWhiteBoxTest> constructor, |
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139 String[] args) { |
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140 if (args.length == 0) { |
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141 for (TestCase test : SimpleTestCase.values()) { |
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142 constructor.apply(test).runTest(); |
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143 } |
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144 } else { |
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145 for (String name : args) { |
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146 constructor.apply(SimpleTestCase.valueOf(name)).runTest(); |
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147 } |
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148 } |
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149 } |
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150 |
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151 /** tested method */ |
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152 protected final Executable method; |
12073 | 153 protected final TestCase testCase; |
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154 |
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155 /** |
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156 * Constructor. |
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157 * |
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158 * @param testCase object, that contains tested method and way to invoke it. |
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159 */ |
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160 protected CompilerWhiteBoxTest(TestCase testCase) { |
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161 Objects.requireNonNull(testCase); |
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162 System.out.println("TEST CASE:" + testCase.name()); |
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163 method = testCase.getExecutable(); |
12073 | 164 this.testCase = testCase; |
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165 } |
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166 |
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167 /** |
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168 * Template method for testing. Prints tested method's info before |
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169 * {@linkplain #test()} and after {@linkplain #test()} or on thrown |
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170 * exception. |
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171 * |
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172 * @throws RuntimeException if method {@linkplain #test()} throws any |
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173 * exception |
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174 * @see #test() |
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175 */ |
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176 protected final void runTest() { |
8051 | 177 if (ManagementFactoryHelper.getCompilationMXBean() == null) { |
178 System.err.println( | |
179 "Warning: test is not applicable in interpreted mode"); | |
180 return; | |
181 } | |
182 System.out.println("at test's start:"); | |
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183 printInfo(); |
8051 | 184 try { |
185 test(); | |
186 } catch (Exception e) { | |
187 System.out.printf("on exception '%s':", e.getMessage()); | |
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188 printInfo(); |
8766 | 189 e.printStackTrace(); |
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190 if (e instanceof RuntimeException) { |
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191 throw (RuntimeException) e; |
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192 } |
8051 | 193 throw new RuntimeException(e); |
194 } | |
195 System.out.println("at test's end:"); | |
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196 printInfo(); |
8051 | 197 } |
198 | |
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199 /** |
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200 * Checks, that {@linkplain #method} is not compiled at the given compilation |
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201 * level or above. |
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202 * |
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203 * @param compLevel |
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204 * |
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205 * @throws RuntimeException if {@linkplain #method} is in compiler queue or |
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206 * is compiled, or if {@linkplain #method} has zero |
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207 * compilation level. |
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208 */ |
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209 |
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210 protected final void checkNotCompiled(int compLevel) { |
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211 if (WHITE_BOX.isMethodQueuedForCompilation(method)) { |
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212 throw new RuntimeException(method + " must not be in queue"); |
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213 } |
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214 if (WHITE_BOX.getMethodCompilationLevel(method, false) >= compLevel) { |
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215 throw new RuntimeException(method + " comp_level must be >= maxCompLevel"); |
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216 } |
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217 if (WHITE_BOX.getMethodCompilationLevel(method, true) >= compLevel) { |
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218 throw new RuntimeException(method + " osr_comp_level must be >= maxCompLevel"); |
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219 } |
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220 } |
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221 |
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222 /** |
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223 * Checks, that {@linkplain #method} is not compiled. |
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224 * |
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225 * @throws RuntimeException if {@linkplain #method} is in compiler queue or |
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226 * is compiled, or if {@linkplain #method} has zero |
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227 * compilation level. |
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228 */ |
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229 protected final void checkNotCompiled() { |
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230 if (WHITE_BOX.isMethodQueuedForCompilation(method)) { |
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231 throw new RuntimeException(method + " must not be in queue"); |
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232 } |
12073 | 233 if (WHITE_BOX.isMethodCompiled(method, false)) { |
8051 | 234 throw new RuntimeException(method + " must be not compiled"); |
235 } | |
12073 | 236 if (WHITE_BOX.getMethodCompilationLevel(method, false) != 0) { |
8051 | 237 throw new RuntimeException(method + " comp_level must be == 0"); |
238 } | |
12073 | 239 if (WHITE_BOX.isMethodCompiled(method, true)) { |
240 throw new RuntimeException(method + " must be not osr_compiled"); | |
241 } | |
242 if (WHITE_BOX.getMethodCompilationLevel(method, true) != 0) { | |
243 throw new RuntimeException(method + " osr_comp_level must be == 0"); | |
244 } | |
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245 } |
8051 | 246 |
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247 /** |
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248 * Checks, that {@linkplain #method} is compiled. |
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249 * |
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250 * @throws RuntimeException if {@linkplain #method} isn't in compiler queue |
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251 * and isn't compiled, or if {@linkplain #method} |
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252 * has nonzero compilation level |
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253 */ |
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254 protected final void checkCompiled() { |
8051 | 255 final long start = System.currentTimeMillis(); |
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256 waitBackgroundCompilation(); |
8051 | 257 if (WHITE_BOX.isMethodQueuedForCompilation(method)) { |
258 System.err.printf("Warning: %s is still in queue after %dms%n", | |
259 method, System.currentTimeMillis() - start); | |
260 return; | |
261 } | |
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262 if (!WHITE_BOX.isMethodCompiled(method, testCase.isOsr())) { |
12073 | 263 throw new RuntimeException(method + " must be " |
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264 + (testCase.isOsr() ? "osr_" : "") + "compiled"); |
12073 | 265 } |
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266 if (WHITE_BOX.getMethodCompilationLevel(method, testCase.isOsr()) |
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267 == 0) { |
12073 | 268 throw new RuntimeException(method |
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269 + (testCase.isOsr() ? " osr_" : " ") |
12073 | 270 + "comp_level must be != 0"); |
271 } | |
272 } | |
273 | |
274 protected final void deoptimize() { | |
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275 WHITE_BOX.deoptimizeMethod(method, testCase.isOsr()); |
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276 if (testCase.isOsr()) { |
12073 | 277 WHITE_BOX.deoptimizeMethod(method, false); |
8051 | 278 } |
12073 | 279 } |
280 | |
281 protected final int getCompLevel() { | |
17817 | 282 NMethod nm = NMethod.get(method, testCase.isOsr()); |
283 return nm == null ? COMP_LEVEL_NONE : nm.comp_level; | |
12073 | 284 } |
285 | |
286 protected final boolean isCompilable() { | |
287 return WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY, | |
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288 testCase.isOsr()); |
12073 | 289 } |
290 | |
291 protected final boolean isCompilable(int compLevel) { | |
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292 return WHITE_BOX |
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293 .isMethodCompilable(method, compLevel, testCase.isOsr()); |
12073 | 294 } |
295 | |
296 protected final void makeNotCompilable() { | |
297 WHITE_BOX.makeMethodNotCompilable(method, COMP_LEVEL_ANY, | |
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298 testCase.isOsr()); |
12073 | 299 } |
300 | |
301 protected final void makeNotCompilable(int compLevel) { | |
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302 WHITE_BOX.makeMethodNotCompilable(method, compLevel, testCase.isOsr()); |
8051 | 303 } |
304 | |
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305 /** |
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306 * Waits for completion of background compilation of {@linkplain #method}. |
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307 */ |
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308 protected final void waitBackgroundCompilation() { |
8766 | 309 if (!BACKGROUND_COMPILATION) { |
310 return; | |
311 } | |
8051 | 312 final Object obj = new Object(); |
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313 for (int i = 0; i < 10 |
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314 && WHITE_BOX.isMethodQueuedForCompilation(method); ++i) { |
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315 synchronized (obj) { |
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316 try { |
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317 obj.wait(1000); |
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318 } catch (InterruptedException e) { |
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319 Thread.currentThread().interrupt(); |
8051 | 320 } |
321 } | |
322 } | |
323 } | |
324 | |
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325 /** |
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326 * Prints information about {@linkplain #method}. |
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327 */ |
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328 protected final void printInfo() { |
8051 | 329 System.out.printf("%n%s:%n", method); |
330 System.out.printf("\tcompilable:\t%b%n", | |
12073 | 331 WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY, false)); |
8051 | 332 System.out.printf("\tcompiled:\t%b%n", |
12073 | 333 WHITE_BOX.isMethodCompiled(method, false)); |
8051 | 334 System.out.printf("\tcomp_level:\t%d%n", |
12073 | 335 WHITE_BOX.getMethodCompilationLevel(method, false)); |
336 System.out.printf("\tosr_compilable:\t%b%n", | |
337 WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY, true)); | |
338 System.out.printf("\tosr_compiled:\t%b%n", | |
339 WHITE_BOX.isMethodCompiled(method, true)); | |
340 System.out.printf("\tosr_comp_level:\t%d%n", | |
341 WHITE_BOX.getMethodCompilationLevel(method, true)); | |
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342 System.out.printf("\tin_queue:\t%b%n", |
8051 | 343 WHITE_BOX.isMethodQueuedForCompilation(method)); |
344 System.out.printf("compile_queues_size:\t%d%n%n", | |
345 WHITE_BOX.getCompileQueuesSize()); | |
346 } | |
347 | |
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348 /** |
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349 * Executes testing. |
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350 */ |
8051 | 351 protected abstract void test() throws Exception; |
352 | |
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353 /** |
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354 * Tries to trigger compilation of {@linkplain #method} by call |
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355 * {@linkplain TestCase#getCallable()} enough times. |
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356 * |
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357 * @return accumulated result |
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358 * @see #compile(int) |
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359 */ |
8051 | 360 protected final int compile() { |
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361 if (testCase.isOsr()) { |
12073 | 362 return compile(1); |
363 } else { | |
364 return compile(THRESHOLD); | |
365 } | |
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366 } |
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367 |
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368 /** |
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369 * Tries to trigger compilation of {@linkplain #method} by call |
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370 * {@linkplain TestCase#getCallable()} specified times. |
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371 * |
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372 * @param count invocation count |
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373 * @return accumulated result |
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374 */ |
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375 protected final int compile(int count) { |
8051 | 376 int result = 0; |
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377 Integer tmp; |
8766 | 378 for (int i = 0; i < count; ++i) { |
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379 try { |
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380 tmp = testCase.getCallable().call(); |
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381 } catch (Exception e) { |
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382 tmp = null; |
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383 } |
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384 result += tmp == null ? 0 : tmp; |
8051 | 385 } |
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386 if (IS_VERBOSE) { |
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387 System.out.println("method was invoked " + count + " times"); |
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388 } |
8051 | 389 return result; |
390 } | |
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391 |
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392 /** |
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393 * Utility interface provides tested method and object to invoke it. |
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394 */ |
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395 public interface TestCase { |
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396 /** the name of test case */ |
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397 String name(); |
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398 |
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399 /** tested method */ |
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400 Executable getExecutable(); |
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401 |
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402 /** object to invoke {@linkplain #getExecutable()} */ |
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403 Callable<Integer> getCallable(); |
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404 |
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405 /** flag for OSR test case */ |
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406 boolean isOsr(); |
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407 } |
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408 |
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409 /** |
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410 * @return {@code true} if the current test case is OSR and the mode is |
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411 * Xcomp, otherwise {@code false} |
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412 */ |
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413 protected boolean skipXcompOSR() { |
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414 boolean result = testCase.isOsr() |
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415 && CompilerWhiteBoxTest.MODE.startsWith("compiled "); |
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416 if (result && IS_VERBOSE) { |
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417 System.err.printf("Warning: %s is not applicable in %s%n", |
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418 testCase.name(), CompilerWhiteBoxTest.MODE); |
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419 } |
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420 return result; |
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421 } |
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422 } |
8051 | 423 |
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424 enum SimpleTestCase implements CompilerWhiteBoxTest.TestCase { |
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425 /** constructor test case */ |
12073 | 426 CONSTRUCTOR_TEST(Helper.CONSTRUCTOR, Helper.CONSTRUCTOR_CALLABLE, false), |
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427 /** method test case */ |
12073 | 428 METOD_TEST(Helper.METHOD, Helper.METHOD_CALLABLE, false), |
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429 /** static method test case */ |
12073 | 430 STATIC_TEST(Helper.STATIC, Helper.STATIC_CALLABLE, false), |
431 /** OSR constructor test case */ | |
432 OSR_CONSTRUCTOR_TEST(Helper.OSR_CONSTRUCTOR, | |
433 Helper.OSR_CONSTRUCTOR_CALLABLE, true), | |
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434 /** OSR method test case */ |
12073 | 435 OSR_METOD_TEST(Helper.OSR_METHOD, Helper.OSR_METHOD_CALLABLE, true), |
436 /** OSR static method test case */ | |
437 OSR_STATIC_TEST(Helper.OSR_STATIC, Helper.OSR_STATIC_CALLABLE, true); | |
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438 |
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439 private final Executable executable; |
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440 private final Callable<Integer> callable; |
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441 private final boolean isOsr; |
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442 |
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443 private SimpleTestCase(Executable executable, Callable<Integer> callable, |
12073 | 444 boolean isOsr) { |
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445 this.executable = executable; |
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446 this.callable = callable; |
12073 | 447 this.isOsr = isOsr; |
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448 } |
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449 |
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450 @Override |
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451 public Executable getExecutable() { |
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452 return executable; |
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453 } |
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454 |
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455 @Override |
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456 public Callable<Integer> getCallable() { |
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457 return callable; |
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458 } |
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459 |
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460 @Override |
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461 public boolean isOsr() { |
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462 return isOsr; |
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463 } |
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464 |
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465 private static class Helper { |
12073 | 466 |
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467 private static final Callable<Integer> CONSTRUCTOR_CALLABLE |
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468 = new Callable<Integer>() { |
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469 @Override |
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470 public Integer call() throws Exception { |
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471 return new Helper(1337).hashCode(); |
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472 } |
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473 }; |
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474 |
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475 private static final Callable<Integer> METHOD_CALLABLE |
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476 = new Callable<Integer>() { |
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477 private final Helper helper = new Helper(); |
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478 |
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479 @Override |
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480 public Integer call() throws Exception { |
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481 return helper.method(); |
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482 } |
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483 }; |
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484 |
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485 private static final Callable<Integer> STATIC_CALLABLE |
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486 = new Callable<Integer>() { |
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487 @Override |
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488 public Integer call() throws Exception { |
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489 return staticMethod(); |
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490 } |
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491 }; |
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492 |
12073 | 493 private static final Callable<Integer> OSR_CONSTRUCTOR_CALLABLE |
494 = new Callable<Integer>() { | |
495 @Override | |
496 public Integer call() throws Exception { | |
497 return new Helper(null).hashCode(); | |
498 } | |
499 }; | |
500 | |
501 private static final Callable<Integer> OSR_METHOD_CALLABLE | |
502 = new Callable<Integer>() { | |
503 private final Helper helper = new Helper(); | |
504 | |
505 @Override | |
506 public Integer call() throws Exception { | |
507 return helper.osrMethod(); | |
508 } | |
509 }; | |
510 | |
511 private static final Callable<Integer> OSR_STATIC_CALLABLE | |
512 = new Callable<Integer>() { | |
513 @Override | |
514 public Integer call() throws Exception { | |
515 return osrStaticMethod(); | |
516 } | |
517 }; | |
518 | |
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519 private static final Constructor CONSTRUCTOR; |
12073 | 520 private static final Constructor OSR_CONSTRUCTOR; |
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521 private static final Method METHOD; |
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522 private static final Method STATIC; |
12073 | 523 private static final Method OSR_METHOD; |
524 private static final Method OSR_STATIC; | |
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525 |
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526 static { |
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527 try { |
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528 CONSTRUCTOR = Helper.class.getDeclaredConstructor(int.class); |
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529 } catch (NoSuchMethodException | SecurityException e) { |
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530 throw new RuntimeException( |
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531 "exception on getting method Helper.<init>(int)", e); |
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532 } |
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533 try { |
12073 | 534 OSR_CONSTRUCTOR = Helper.class.getDeclaredConstructor( |
535 Object.class); | |
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536 } catch (NoSuchMethodException | SecurityException e) { |
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537 throw new RuntimeException( |
12073 | 538 "exception on getting method Helper.<init>(Object)", e); |
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539 } |
12073 | 540 METHOD = getMethod("method"); |
541 STATIC = getMethod("staticMethod"); | |
542 OSR_METHOD = getMethod("osrMethod"); | |
543 OSR_STATIC = getMethod("osrStaticMethod"); | |
544 } | |
545 | |
546 private static Method getMethod(String name) { | |
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547 try { |
12073 | 548 return Helper.class.getDeclaredMethod(name); |
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549 } catch (NoSuchMethodException | SecurityException e) { |
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550 throw new RuntimeException( |
12073 | 551 "exception on getting method Helper." + name, e); |
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552 } |
12073 | 553 |
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554 } |
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555 |
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556 private static int staticMethod() { |
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557 return 1138; |
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558 } |
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559 |
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560 private int method() { |
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561 return 42; |
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562 } |
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563 |
12073 | 564 private static int osrStaticMethod() { |
565 int result = 0; | |
566 for (long i = 0; i < CompilerWhiteBoxTest.BACKEDGE_THRESHOLD; ++i) { | |
567 result += staticMethod(); | |
568 } | |
569 return result; | |
570 } | |
571 | |
572 private int osrMethod() { | |
573 int result = 0; | |
574 for (long i = 0; i < CompilerWhiteBoxTest.BACKEDGE_THRESHOLD; ++i) { | |
575 result += method(); | |
576 } | |
577 return result; | |
578 } | |
579 | |
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580 private final int x; |
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581 |
12073 | 582 // for method and OSR method test case |
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583 public Helper() { |
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584 x = 0; |
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585 } |
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586 |
12073 | 587 // for OSR constructor test case |
588 private Helper(Object o) { | |
589 int result = 0; | |
590 for (long i = 0; i < CompilerWhiteBoxTest.BACKEDGE_THRESHOLD; ++i) { | |
591 result += method(); | |
592 } | |
593 x = result; | |
594 } | |
595 | |
596 // for constructor test case | |
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597 private Helper(int x) { |
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598 this.x = x; |
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599 } |
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600 |
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601 @Override |
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602 public int hashCode() { |
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603 return x; |
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604 } |
8051 | 605 } |
606 } |