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 * @test 26 * @bug 8195100 27 * @summary a short lived Symbol should be cleaned up 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @requires (vm.debug == true) 32 */ 33 34 import jdk.test.lib.Platform; 35 import jdk.test.lib.process.OutputAnalyzer; 36 import jdk.test.lib.process.ProcessTools; 37 import java.util.Scanner; 38 39 public class ShortLivedSymbolCleanup { 40 41 static final int DEFAULT_SYMBOL_TABLE_SIZE_POWER_2 = 14; 42 static final int SIZE = (int)Math.pow(2, DEFAULT_SYMBOL_TABLE_SIZE_POWER_2+1); 43 44 static void analyzeOutputOn(ProcessBuilder pb) throws Exception { 45 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start()); 46 String output = analyzer.getStdout(); 47 analyzer.shouldHaveExitValue(0); 48 49 // Split string into lines using platform independent end of line marker. 50 String[] lines = output.split("\\R"); 51 for (String line : lines) { 52 if (line.startsWith("Total removed")) { 53 // ex. "Total removed 13309" 54 Scanner scanner = new Scanner(line); 55 scanner.next(); // skip "Total" 56 scanner.next(); // skip "removed" 57 int removed = Integer.parseInt(scanner.next()); // process "13309" 58 scanner.close(); 59 60 if (removed < (SIZE/2)) { 61 System.out.println(output); 62 // We should have removed at least half of the temporary Symbols 63 throw new RuntimeException("Did not clean dead temporary Symbols"); 64 } 65 } 66 } 67 } 68 69 public static void main(String[] args) throws Exception { 70 if (Platform.isDebugBuild()) { 71 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSymbolTableSizeHistogram", 72 LotsOfTempSymbols.class.getName()); 73 analyzeOutputOn(pb); 74 } 75 } 76 77 static class LotsOfTempSymbols { 78 public static void main(String [] args) { 79 // Create enough temporary Symbols, that we are 80 // guranteed to insert into every bucket twice, 81 // and therefore have the table check for dead entries 82 for (int i=0; i<SIZE; i++) { 83 try { 84 Class.forName(String.format("%05d", i), false, null); 85 } catch (java.lang.ClassNotFoundException e) {} 86 } 87 } 88 } 89 } 90