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/*

 * @test TestMaxNewSize

 * @key gc

 * @bug 7057939

 * @summary Make sure that MaxNewSize always has a useful value after argument

 * processing.

 * @library /testlibrary

 * @modules java.base/sun.misc

 *          java.management

 * @build TestMaxNewSize

 * @run main TestMaxNewSize -XX:+UseSerialGC

 * @run main TestMaxNewSize -XX:+UseParallelGC

 * @run main TestMaxNewSize -XX:+UseConcMarkSweepGC

 * @run main TestMaxNewSize -XX:+UseG1GC

 * @author thomas.schatzl@oracle.com, jesper.wilhelmsson@oracle.com

 */

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import java.math.BigInteger;

import java.util.ArrayList;

import java.util.Arrays;

public class TestMaxNewSize {

  private static void checkMaxNewSize(String[] flags, int heapsize) throws Exception {

    BigInteger actual = new BigInteger(getMaxNewSize(flags));

    System.out.println(actual);

    if (actual.compareTo(new BigInteger((new Long(heapsize)).toString())) == 1) {

      throw new RuntimeException("MaxNewSize value set to \"" + actual +

        "\", expected otherwise when running with the following flags: " + Arrays.asList(flags).toString());

    }

  }

  private static void checkIncompatibleNewSize(String[] flags) throws Exception {

    ArrayList<String> finalargs = new ArrayList<String>();

    finalargs.addAll(Arrays.asList(flags));

    finalargs.add("-version");

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));

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

    output.shouldContain("Initial young gen size set larger than the maximum young gen size");

  }

  private static boolean isRunningG1(String[] args) {

    for (int i = 0; i < args.length; i++) {

      if (args[i].contains("+UseG1GC")) {

        return true;

      }

    }

    return false;

  }

  private static String getMaxNewSize(String[] flags) throws Exception {

    ArrayList<String> finalargs = new ArrayList<String>();

    finalargs.addAll(Arrays.asList(flags));

    if (isRunningG1(flags)) {

      finalargs.add("-XX:G1HeapRegionSize=1M");

    }

    finalargs.add("-XX:+PrintFlagsFinal");

    finalargs.add("-version");

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));

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

    output.shouldHaveExitValue(0);

    String stdout = output.getStdout();

    //System.out.println(stdout);

    return getFlagValue("MaxNewSize", stdout);

  }

  private static String getFlagValue(String flag, String where) {

    Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);

    if (!m.find()) {

      throw new RuntimeException("Could not find value for flag " + flag + " in output string");

    }

    String match = m.group();

    return match.substring(match.lastIndexOf(" ") + 1, match.length());

  }

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

    String gcName = args[0];

    final int M32 = 32 * 1024 * 1024;

    final int M64 = 64 * 1024 * 1024;

    final int M96 = 96 * 1024 * 1024;

    final int M128 = 128 * 1024 * 1024;

    checkMaxNewSize(new String[] { gcName, "-Xmx128M" }, M128);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:NewRatio=5" }, M128);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:NewSize=32M" }, M128);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:OldSize=96M" }, M128);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:MaxNewSize=32M" }, M32);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:NewSize=32M", "-XX:MaxNewSize=32M" }, M32);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-XX:NewRatio=6", "-XX:MaxNewSize=32M" }, M32);

    checkMaxNewSize(new String[] { gcName, "-Xmx128M", "-Xms96M" }, M128);

    checkMaxNewSize(new String[] { gcName, "-Xmx96M", "-Xms96M" }, M96);

    checkMaxNewSize(new String[] { gcName, "-XX:NewSize=128M", "-XX:MaxNewSize=50M"}, M128);

  }

}