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 int getSymbolTableSize(ProcessBuilder pb) throws Exception { 42 int size = 0; 43 44 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start()); 45 String output = analyzer.getStdout(); 46 analyzer.shouldHaveExitValue(0); 47 48 // Split string into lines using platform independent end of line marker. 49 String[] lines = output.split("\\R"); 50 for (String line : lines) { 51 if (line.contains("Start size")) { 52 // ex. "[0.023s][trace][symboltable] Start size: 32768 (15)" 53 Scanner scanner = new Scanner(line); 54 scanner.next(); // skip "[0.023s][trace][symboltable]" 55 scanner.next(); // skip "Start" 56 scanner.next(); // skip "size:" 57 size = Integer.parseInt(scanner.next()); // process "32768" 58 scanner.close(); 59 } 60 } 61 62 return size; 63 } 64 65 static void analyzeOutputOn(int size, ProcessBuilder pb) throws Exception { 66 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start()); 67 String output = analyzer.getStdout(); 68 analyzer.shouldHaveExitValue(0); 69 70 // Split string into lines using platform independent end of line marker. 71 String[] lines = output.split("\\R"); 72 for (String line : lines) { 73 if (line.startsWith(" Total removed")) { 74 // ex. "Total removed 13309" 75 Scanner scanner = new Scanner(line); 76 scanner.next(); // skip "Total" 77 scanner.next(); // skip "removed" 78 int removed = Integer.parseInt(scanner.next()); // process "13309" 79 scanner.close(); 80 81 if (removed < (size/2)) { 82 System.out.println(output); 83 // We should have removed at least half of the temporary Symbols 84 throw new RuntimeException("Did not clean dead temporary Symbols [removed:"+removed+", size:"+size+"]"); 85 } 86 } 87 } 88 } 89 90 public static void main(String[] args) throws Exception { 91 92 if (Platform.isDebugBuild()) { 93 { 94 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:symboltable=trace", 95 "-version"); 96 int size = getSymbolTableSize(pb); 97 98 pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSymbolTableSizeHistogram", 99 LotsOfTempSymbols.class.getName(), 100 Integer.toString(size)); 101 analyzeOutputOn(size, pb); 102 } 103 } 104 } 105 106 static class LotsOfTempSymbols { 107 public static void main(String [] args) { 108 int size = 2*Integer.parseInt(args[0]); 109 // Create enough temporary Symbols, that we are 110 // guranteed to insert into every bucket twice, 111 // and therefore have the table check for dead entries 112 for (int i=0; i<size; i++) { 113 try { 114 Class.forName(String.format("%05d", i), false, null); 115 } catch (java.lang.ClassNotFoundException e) {} 116 } 117 } 118 } 119 } 120