1 /* 2 * Copyright (c) 2018, 2024, 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 * @requires vm.flagless 31 * 32 * @library /test/hotspot/jtreg/runtime/cds/appcds /test/lib 33 * @build HelloString 34 * @build jdk.test.whitebox.WhiteBox 35 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox 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 jdk.test.whitebox.WhiteBox; 43 import jdk.test.lib.cds.CDSTestUtils; 44 import jdk.test.lib.process.OutputAnalyzer; 45 import jdk.test.lib.process.ProcessTools; 46 import jdk.test.lib.Asserts; 47 48 public class SharedStringsHumongous { 49 static String sharedArchiveConfigFile = CDSTestUtils.getOutputDir() + File.separator + "SharedStringsHumongous_gen.txt"; 50 51 public static void main(String[] args) throws Exception { 52 WhiteBox wb = WhiteBox.getWhiteBox(); 53 54 try (FileOutputStream fos = new FileOutputStream(sharedArchiveConfigFile)) { 55 PrintWriter out = new PrintWriter(new OutputStreamWriter(fos)); 56 out.println("VERSION: 1.0"); 57 out.println("@SECTION: String"); 58 out.println("31: shared_test_string_unique_14325"); 59 int region_size = wb.g1RegionSize(); 60 char body[] = new char[region_size + region_size / 2]; 61 for (int i = 0; i < body.length; i++) { 62 body[i] = 'x'; 63 } 64 Asserts.assertTrue(wb.g1IsHumongous(body)); 65 String prefix = "generated_string (followed by " + body.length + " 'x') "; 66 67 System.out.println("G1 region size: " + region_size); 68 System.out.println("Using a humongous string: " + prefix); 69 70 String s = prefix + new String(body); 71 out.println(s.length() + ": " + s); 72 out.close(); 73 } 74 75 SharedStringsUtils.run(args, SharedStringsHumongous::test); 76 } 77 78 public static void test(String[] args) throws Exception { 79 String vmOptionsPrefix[] = SharedStringsUtils.getChildVMOptionsPrefix(); 80 String appJar = JarBuilder.build("SharedStringsHumongous", "HelloString"); 81 82 OutputAnalyzer dumpOutput = TestCommon.dump(appJar, TestCommon.list("HelloString"), 83 TestCommon.concat(vmOptionsPrefix, 84 "-XX:SharedArchiveConfigFile=" + sharedArchiveConfigFile, 85 "-Xlog:gc+region+cds", 86 "-Xlog:gc+region=trace")); 87 TestCommon.checkDump(dumpOutput, "extra interned string ignored; size too large"); 88 // Extra strings that are humongous are not kept alive, so they should be GC'ed 89 // before dumping the string table. That means the heap should contain no 90 // humongous regions. 91 dumpOutput.shouldNotMatch("gc,region,cds. G1HeapRegion 0x[0-9a-f]* HUM"); 92 93 OutputAnalyzer execOutput = TestCommon.exec(appJar, 94 TestCommon.concat(vmOptionsPrefix, "HelloString")); 95 TestCommon.checkExec(execOutput); 96 } 97 }