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20540
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @key gc
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27 * @bug 8049831
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28 * @library /testlibrary /testlibrary/whitebox
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29 * @build TestCapacityUntilGCWrapAround
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30 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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31 * sun.hotspot.WhiteBox$WhiteBoxPermission
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32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestCapacityUntilGCWrapAround
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33 */
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34
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35 import sun.hotspot.WhiteBox;
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36
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37 import com.oracle.java.testlibrary.Asserts;
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38 import com.oracle.java.testlibrary.Platform;
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39
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40 public class TestCapacityUntilGCWrapAround {
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41 private static long MB = 1024 * 1024;
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42 private static long GB = 1024 * MB;
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43 private static long MAX_UINT = 4 * GB - 1; // On 32-bit platforms
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44
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45 public static void main(String[] args) {
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46 if (Platform.is32bit()) {
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47 WhiteBox wb = WhiteBox.getWhiteBox();
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48
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49 long before = wb.metaspaceCapacityUntilGC();
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50 // Now force possible overflow of capacity_until_GC.
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51 long after = wb.incMetaspaceCapacityUntilGC(MAX_UINT);
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52
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53 Asserts.assertGTE(after, before,
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54 "Increasing with MAX_UINT should not cause wrap around: " + after + " < " + before);
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55 Asserts.assertLTE(after, MAX_UINT,
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56 "Increasing with MAX_UINT should not cause value larger than MAX_UINT:" + after);
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57 }
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58 }
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59 }
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