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