1 /*
2  * Copyright (c) 2014, 2016, 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 package compiler.codecache.stress;
25 
26 import jdk.test.lib.Asserts;
27 import jdk.test.lib.ByteCodeLoader;
28 import jdk.test.lib.InfiniteLoop;
29 import jdk.test.lib.Utils;
30 import sun.hotspot.WhiteBox;
31 
32 import java.io.BufferedInputStream;
33 import java.io.ByteArrayOutputStream;
34 import java.io.IOException;
35 import java.util.Random;
36 import java.util.concurrent.Callable;
37 
38 public final class Helper {
39     public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
40     public static final Random RNG = Utils.getRandomInstance();
41 
42     private static final long THRESHOLD = WHITE_BOX.getIntxVMFlag("CompileThreshold");
43     private static final String TEST_CASE_IMPL_CLASS_NAME = "compiler.codecache.stress.Helper$TestCaseImpl";
44     private static byte[] CLASS_DATA;
45     static {
46         try {
47             CLASS_DATA = loadClassData(TEST_CASE_IMPL_CLASS_NAME);
48         } catch (IOException e) {
49             throw new Error("TESTBUG: cannot load class byte code " + TEST_CASE_IMPL_CLASS_NAME, e);
50         }
51     }
52 
Helper()53     private Helper() {
54     }
55 
startInfiniteLoopThread(Runnable action)56     public static void startInfiniteLoopThread(Runnable action) {
57         startInfiniteLoopThread(action, 0L);
58     }
59 
startInfiniteLoopThread(Runnable action, long millis)60     public static void startInfiniteLoopThread(Runnable action, long millis) {
61         Thread t = new Thread(new InfiniteLoop(action, millis));
62         t.setDaemon(true);
63         t.start();
64     }
65 
callMethod(Callable<Integer> callable, int expected)66     public static int callMethod(Callable<Integer> callable, int expected) {
67         int result = 0;
68         for (int i = 0; i < THRESHOLD; ++i) {
69             try {
70                 result = callable.call();
71             } catch (Exception e) {
72                 throw new AssertionError(
73                         "Exception occurred during test method execution", e);
74             }
75             Asserts.assertEQ(result, expected, "Method returns unexpected value");
76         }
77         return result;
78     }
79 
loadClassData(String name)80     private static byte[] loadClassData(String name) throws IOException {
81         try (BufferedInputStream in = new BufferedInputStream(
82                 ClassLoader.getSystemResourceAsStream(name.replace(".", "/")
83                         + ".class"))) {
84             ByteArrayOutputStream result = new ByteArrayOutputStream();
85             byte[] buffer = new byte[1024];
86             int read;
87             while ((read = in.read(buffer)) != -1) {
88                 result.write(buffer, 0, read);
89             }
90             return result.toByteArray();
91         }
92     }
93 
94     public interface TestCase {
95 
get()96         public static TestCase get() {
97             try {
98                 Class clazz = ByteCodeLoader.load(
99                         TEST_CASE_IMPL_CLASS_NAME, CLASS_DATA);
100                 return (TestCase) clazz.newInstance();
101             } catch (ReflectiveOperationException e) {
102                 throw new Error(String.format(
103                         "TESTBUG: error while creating %s instance from reloaded class",
104                         TEST_CASE_IMPL_CLASS_NAME), e);
105             }
106         }
107 
getCallable()108         Callable<Integer> getCallable();
method()109         int method();
expectedValue()110         int expectedValue();
111     }
112 
113     public static class TestCaseImpl implements TestCase {
114         private static final int RETURN_VALUE = 42;
115         private static final int RECURSION_DEPTH = 10;
116         private volatile int i;
117 
118         @Override
getCallable()119         public Callable<Integer> getCallable() {
120             return () -> {
121                 i = 0;
122                 return method();
123             };
124         }
125 
126         @Override
method()127         public int method() {
128             ++i;
129             int result = RETURN_VALUE;
130             if (i < RECURSION_DEPTH) {
131                 return result + method();
132             }
133             return result;
134         }
135 
136         @Override
expectedValue()137         public int expectedValue() {
138             return RETURN_VALUE * RECURSION_DEPTH;
139         }
140     }
141 
142 }
143