/*

 * Copyright (c) 2013, 2016, 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.

 *

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 */

/*

 * @test HeapChangeLogging.java

 * @bug 8027440

 * @requires vm.gc.Serial

 * @library /test/lib

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

 * @summary Allocate to get a promotion failure and verify that that heap change logging is present.

 * @run main HeapChangeLogging

 */

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class HeapChangeLogging {

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

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xmx128m", "-Xmn100m", "-XX:+UseSerialGC", "-Xlog:gc", "HeapFiller");

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

    String stdout = output.getStdout();

    System.out.println(stdout);

    Matcher stdoutMatcher = Pattern.compile(".*\\(Allocation Failure\\) [0-9]+[KMG]->[0-9]+[KMG]\\([0-9]+[KMG]\\)", Pattern.MULTILINE).matcher(stdout);

    if (!stdoutMatcher.find()) {

      throw new RuntimeException("No proper GC log line found");

    }

    output.shouldHaveExitValue(0);

  }

}

class HeapFiller {

  public static Entry root;

  private static final int PAYLOAD_SIZE = 1000;

  public static void main(String[] args) {

    root = new Entry(PAYLOAD_SIZE, null);

    Entry current = root;

    try {

      while (true) {

        Entry newEntry = new Entry(PAYLOAD_SIZE, current);

        current = newEntry;

      }

    } catch (OutOfMemoryError e) {

      root = null;

    }

  }

}

class Entry {

  public Entry previous;

  public byte[] payload;

  Entry(int payloadSize, Entry previous) {

    payload = new byte[payloadSize];

    this.previous = previous;

  }

}