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 }