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65 lines
2.3 KiB
65 lines
2.3 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.util.Random;
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public class Main {
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private static final int buckets = 16 * 1024;
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private static final int bufferSize = 1024;
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static class ByteContainer {
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public byte[] bytes;
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}
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public static void main(String[] args) throws Exception {
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ByteContainer[] l = new ByteContainer[buckets];
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for (int i = 0; i < buckets; ++i) {
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l[i] = new ByteContainer();
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}
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Random rnd = new Random(123456);
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for (int i = 0; i < buckets / 256; ++i) {
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int index = rnd.nextInt(buckets);
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l[index].bytes = new byte[bufferSize];
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// Try to get GC to run if we can
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Runtime.getRuntime().gc();
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// Shuffle the array to try cause the lost object problem:
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// This problem occurs when an object is white, it may be
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// only referenced from a white or grey object. If the white
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// object is moved during a CMS to be a black object's field, it
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// causes the moved object to not get marked. This can result in
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// heap corruption. A typical way to address this issue is by
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// having a card table.
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// This aspect of the test is meant to ensure that card
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// dirtying works and that we check the marked cards after
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// marking.
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// If these operations are not done, a segfault / failed assert
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// should occur.
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for (int j = 0; j < l.length; ++j) {
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int a = l.length - i - 1;
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int b = rnd.nextInt(a);
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byte[] temp = l[a].bytes;
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l[a].bytes = l[b].bytes;
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l[b].bytes = temp;
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}
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}
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System.out.println("Test complete");
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}
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}
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