1 /*

     2  * Copyright (c) 2018, 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 /*

    26  * @test

    27  * @summary Use a shared string allocated in a humongous G1 region.

    28  * @comment -- the following implies that G1 is used (by command-line or by default)

    29  * @requires vm.cds.archived.java.heap

    30  *

    31  * @library /test/hotspot/jtreg/runtime/appcds /test/lib

    32  * @modules jdk.jartool/sun.tools.jar

    33  * @build HelloString

    34  * @build sun.hotspot.WhiteBox

    35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission

    36  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. SharedStringsHumongous

    37  */

    38 import java.io.File;

    39 import java.io.FileOutputStream;

    40 import java.io.OutputStreamWriter;

    41 import java.io.PrintWriter;

    42 import sun.hotspot.WhiteBox;

    43 import jdk.test.lib.process.OutputAnalyzer;

    44 import jdk.test.lib.process.ProcessTools;

    45 import jdk.test.lib.Asserts;

    46 

    47 public class SharedStringsHumongous {

    48     static String sharedArchiveConfigFile = System.getProperty("user.dir") + File.separator + "SharedStringsHumongous_gen.txt";

    49 

    50     public static void main(String[] args) throws Exception {

    51         WhiteBox wb = WhiteBox.getWhiteBox();

    52 

    53         try (FileOutputStream fos = new FileOutputStream(sharedArchiveConfigFile)) {

    54             PrintWriter out = new PrintWriter(new OutputStreamWriter(fos));

    55             out.println("VERSION: 1.0");

    56             out.println("@SECTION: String");

    57             out.println("31: shared_test_string_unique_14325");

    58             int region_size = wb.g1RegionSize();

    59             char body[] = new char[region_size + region_size / 2];

    60             for (int i = 0; i < body.length; i++) {

    61               body[i] = 'x';

    62             }

    63             Asserts.assertTrue(wb.g1IsHumongous(body));

    64             String prefix = "generated_string (followed by " + body.length + " 'x') ";

    65 

    66             System.out.println("G1 region size: " + region_size);

    67             System.out.println("Using a humongous string: " + prefix);

    68 

    69             String s = prefix + new String(body);

    70             out.println(s.length() + ": " + s);

    71             out.close();

    72         }

    73 

    74         SharedStringsUtils.run(args, SharedStringsHumongous::test);

    75     }

    76 

    77     public static void test(String[] args) throws Exception {

    78         String vmOptionsPrefix[] = SharedStringsUtils.getChildVMOptionsPrefix();

    79         String appJar = JarBuilder.build("SharedStringsHumongous", "HelloString");

    80 

    81         OutputAnalyzer dumpOutput = TestCommon.dump(appJar, TestCommon.list("HelloString"),

    82                 TestCommon.concat(vmOptionsPrefix,

    83                     "-XX:SharedArchiveConfigFile=" + sharedArchiveConfigFile,

    84                     "-Xlog:gc+region+cds",

    85                     "-Xlog:gc+region=trace"));

    86         TestCommon.checkDump(dumpOutput, "extra interned string ignored; size too large");

    87         // Extra strings that are humongous are not kelp alive, so they should be GC'ed

    88         // before dumping the string table. That means the heap should contain no

    89         // humongous regions.

    90         dumpOutput.shouldNotMatch("gc,region,cds. HeapRegion 0x[0-9a-f]* HUM");

    91 

    92         OutputAnalyzer execOutput = TestCommon.exec(appJar,

    93             TestCommon.concat(vmOptionsPrefix, "HelloString"));

    94         TestCommon.checkExec(execOutput);

    95     }

    96 }