1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 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 */ 24 25 import java.io.BufferedInputStream; 26 import java.io.ByteArrayOutputStream; 27 import java.io.IOException; 28 import java.util.concurrent.Callable; 29 import java.util.Random; 30 31 import com.oracle.java.testlibrary.Asserts; 32 import com.oracle.java.testlibrary.ByteCodeLoader; 33 import com.oracle.java.testlibrary.InfiniteLoop; 34 import com.oracle.java.testlibrary.Utils; 35 import sun.hotspot.WhiteBox; 36 37 public final class Helper { 38 public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); 39 public static final Random RNG = Utils.getRandomInstance(); 40 41 private static final long THRESHOLD = WHITE_BOX.getIntxVMFlag("CompileThreshold"); 42 private static final String TEST_CASE_IMPL_CLASS_NAME = "Helper$TestCaseImpl"; 43 private static byte[] CLASS_DATA; 44 static { 45 try { 46 CLASS_DATA = loadClassData(TEST_CASE_IMPL_CLASS_NAME); 47 } catch (IOException e) { 48 throw new Error("TESTBUG: cannot load class byte code", e); 49 } 50 } 51 52 private Helper() { 53 } 54 55 public static void startInfiniteLoopThread(Runnable action) { 56 startInfiniteLoopThread(action, 0L); 57 } 58 59 public static void startInfiniteLoopThread(Runnable action, long millis) { 60 Thread t = new Thread(new InfiniteLoop(action, millis)); 61 t.setDaemon(true); 62 t.start(); 63 } 64 65 public static int callMethod(Callable<Integer> callable, int expected) { 66 int result = 0; 67 for (int i = 0; i < THRESHOLD; ++i) { 68 try { 69 result = callable.call(); 70 } catch (Exception e) { 71 throw new AssertionError( 72 "Exception occurred during test method execution", e); 73 } 74 Asserts.assertEQ(result, expected, "Method returns unexpected value"); 75 } 76 return result; 77 } 78 79 private static byte[] loadClassData(String name) throws IOException { 80 try (BufferedInputStream in = new BufferedInputStream( 81 ClassLoader.getSystemResourceAsStream(name.replace(".", "/") 82 + ".class"))) { 83 ByteArrayOutputStream result = new ByteArrayOutputStream(); 84 byte[] buffer = new byte[1024]; 85 int read; 86 while ((read = in.read(buffer)) != -1) { 87 result.write(buffer, 0, read); 88 } 89 return result.toByteArray(); 90 } 91 } 92 93 public interface TestCase { 94 95 public static TestCase get() { 96 try { 97 Class clazz = ByteCodeLoader.load( 98 TEST_CASE_IMPL_CLASS_NAME, CLASS_DATA); 99 return (TestCase) clazz.newInstance(); 100 } catch (ReflectiveOperationException e) { 101 throw new Error(String.format( 102 "TESTBUG: error while creating %s instance from reloaded class", 103 TEST_CASE_IMPL_CLASS_NAME), e); 104 } 105 } 106 107 Callable<Integer> getCallable(); 108 int method(); 109 int expectedValue(); 110 } 111 112 public static class TestCaseImpl implements TestCase { 113 private static final int RETURN_VALUE = 42; 114 private static final int RECURSION_DEPTH = 10; 115 private volatile int i; 116 117 @Override 118 public Callable<Integer> getCallable() { 119 return () -> { 120 i = 0; 121 return method(); 122 }; 123 } 124 125 @Override 126 public int method() { 127 ++i; 128 int result = RETURN_VALUE; 129 if (i < RECURSION_DEPTH) { 130 return result + method(); 131 } 132 return result; 133 } 134 135 @Override 136 public int expectedValue() { 137 return RETURN_VALUE * RECURSION_DEPTH; 138 } 139 } 140 141 }