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/cds /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 }