1 /*
2 * Copyright (c) 2018, 2022, 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.write.archived.java.heap
30 *
31 * @library /test/hotspot/jtreg/runtime/cds/appcds /test/lib
32 * @build HelloString
33 * @build jdk.test.whitebox.WhiteBox
34 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
35 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. SharedStringsHumongous
36 */
37 import java.io.File;
38 import java.io.FileOutputStream;
39 import java.io.OutputStreamWriter;
40 import java.io.PrintWriter;
41 import jdk.test.whitebox.WhiteBox;
42 import jdk.test.lib.cds.CDSTestUtils;
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 = CDSTestUtils.getOutputDir() + 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 kept 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. G1HeapRegion 0x[0-9a-f]* HUM");
91
92 OutputAnalyzer execOutput = TestCommon.exec(appJar,
93 TestCommon.concat(vmOptionsPrefix, "HelloString"));
94 TestCommon.checkExec(execOutput);
95 }
96 }