/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8195100

 * @summary a short lived Symbol should be cleaned up

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @requires (vm.debug == true)

 */

import jdk.test.lib.Platform;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import java.util.Scanner;

public class ShortLivedSymbolCleanup {

  static int getSymbolTableSize(ProcessBuilder pb) throws Exception {

    int size = 0;

    OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());

    String output = analyzer.getStdout();

    analyzer.shouldHaveExitValue(0);

    // Split string into lines using platform independent end of line marker.

    String[] lines = output.split("\\R");

    for (String line : lines) {

      if (line.contains("Start size")) {

        // ex. "[0.023s][trace][symboltable] Start size: 32768 (15)"

        Scanner scanner = new Scanner(line);

        scanner.next(); // skip "[0.023s][trace][symboltable]"

        scanner.next(); // skip "Start"

        scanner.next(); // skip "size:"

        size = Integer.parseInt(scanner.next()); // process "32768"

        scanner.close();

      }

    }

    return size;

  }

  static void analyzeOutputOn(int size, ProcessBuilder pb) throws Exception {

    OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());

    String output = analyzer.getStdout();

    analyzer.shouldHaveExitValue(0);

    // Split string into lines using platform independent end of line marker.

    String[] lines = output.split("\\R");

    for (String line : lines) {

      if (line.startsWith("  Total removed")) {

        // ex. "Total removed              13309"

        Scanner scanner = new Scanner(line);

        scanner.next(); // skip "Total"

        scanner.next(); // skip "removed"

        int removed = Integer.parseInt(scanner.next()); // process "13309"

        scanner.close();

        if (removed < (size/2)) {

          System.out.println(output);

          // We should have removed at least half of the temporary Symbols

          throw new RuntimeException("Did not clean dead temporary Symbols [removed:"+removed+", size:"+size+"]");

        }

      }

    }

  }

  public static void main(String[] args) throws Exception {

      if (Platform.isDebugBuild()) {

        {

          ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:symboltable=trace",

                                                                    "-version");

          int size = getSymbolTableSize(pb);

          pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSymbolTableSizeHistogram",

                                                                    LotsOfTempSymbols.class.getName(),

                                                                    Integer.toString(size));

          analyzeOutputOn(size, pb);

        }

     }

  }

  static class LotsOfTempSymbols {

    public static void main(String [] args) {

      int size = 2*Integer.parseInt(args[0]);

      // Create enough temporary Symbols, that we are

      // guranteed to insert into every bucket twice,

      // and therefore have the table check for dead entries

      for (int i=0; i<size; i++) {

        try {

          Class.forName(String.format("%05d", i), false, null);

        } catch (java.lang.ClassNotFoundException e) {}

      }

    }

  }

}