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 byte[] CLASS_DATA; 43 static { 44 try { 45 CLASS_DATA = loadClassData(TestCaseImpl.class.getName()); 46 } catch (IOException e) { 47 throw new Error("TESTBUG: cannot load class byte code", e); 48 } 49 } 50 51 private Helper() { 52 } 53 54 public static void startInfiniteLoopThread(Runnable action) { 55 startInfiniteLoopThread(action, 0L); 56 } 57 58 public static void startInfiniteLoopThread(Runnable action, long millis) { 59 Thread t = new Thread(new InfiniteLoop(action, millis)); 60 t.setDaemon(true); 61 t.start(); 62 } 63 64 public static int callMethod(Callable<Integer> callable, int expected) { 65 int result = 0; 66 for (int i = 0; i < THRESHOLD; ++i) { 67 try { 68 result = callable.call(); 69 } catch (Exception e) { 70 throw new AssertionError( 71 "Exception occurred during test method execution", e); 72 } 73 Asserts.assertEQ(result, expected, "Method returns unexpected value"); 74 } 75 return result; 76 } 77 78 private static byte[] loadClassData(String name) throws IOException { 79 try (BufferedInputStream in = new BufferedInputStream( 80 ClassLoader.getSystemResourceAsStream(name.replace(".", "/") 81 + ".class"))) { 82 ByteArrayOutputStream result = new ByteArrayOutputStream(); 83 byte[] buffer = new byte[1024]; 84 int read; 85 while ((read = in.read(buffer)) != -1) { 86 result.write(buffer, 0, read); 87 } 88 return result.toByteArray(); 89 } 90 } 91 92 public interface TestCase { 93 94 public static TestCase get() { 95 String className = TestCaseImpl.class.getName(); 96 try { 97 Class clazz = ByteCodeLoader.load(className, CLASS_DATA); 98 return (TestCase) clazz.newInstance(); 99 } catch (ReflectiveOperationException e) { 100 throw new Error("TESTBUG: error while creating " + className 101 + " instance from reloaded class", e); 102 } 103 } 104 105 Callable<Integer> getCallable(); 106 int method(); 107 int expectedValue(); 108 } 109 110 public static class TestCaseImpl implements TestCase { 111 private static final int RETURN_VALUE = 42; 112 private static final int RECURSION_DEPTH = 10; 113 private volatile int i; 114 115 @Override 116 public Callable<Integer> getCallable() { 117 return () -> { 118 i = 0; 119 return method(); 120 }; 121 } 122 123 @Override 124 public int method() { 125 ++i; 126 int result = RETURN_VALUE; 127 if (i < RECURSION_DEPTH) { 128 return result + method(); 129 } 130 return result; 131 } 132 133 @Override 134 public int expectedValue() { 135 return RETURN_VALUE * RECURSION_DEPTH; 136 } 137 } 138 139 }