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 * 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

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 */

package gc.arguments;

/*

 * @test TestMaxRAMFlags

 * @key gc

 * @bug 8222252

 * @summary Verify correct MaxHeapSize and UseCompressedOops when MaxRAM and MaxRAMPercentage

 * are specified.

 * @library /test/lib

 * @library /

 * @requires vm.bits == "64"

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main gc.arguments.TestMaxRAMFlags

 * @author bob.vandette@oracle.com

 */

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import java.util.ArrayList;

import java.util.Arrays;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

public class TestMaxRAMFlags {

  private static void checkMaxRAMSize(long maxram, int maxrampercent, boolean forcecoop, long expectheap, boolean expectcoop) throws Exception {

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

    args.add("-XX:MaxRAM=" + maxram);

    args.add("-XX:MaxRAMPercentage=" + maxrampercent);

    if (forcecoop) {

      args.add("-XX:+UseCompressedOops");

    }

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

    args.add("-version");

    ProcessBuilder pb = GCArguments.createJavaProcessBuilder(args.toArray(new String[0]));

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

    output.shouldHaveExitValue(0);

    String stdout = output.getStdout();

    long actualheap = new Long(getFlagValue("MaxHeapSize", stdout)).longValue();

    if (actualheap != expectheap) {

      throw new RuntimeException("MaxHeapSize value set to " + actualheap +

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

    }

    boolean actualcoop = getFlagBoolValue("UseCompressedOops", stdout);

    if (actualcoop != expectcoop) {

      throw new RuntimeException("UseCompressedOops set to " + actualcoop +

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

    }

  }

  private static long getHeapBaseMinAddress() throws Exception {

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

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

    args.add("-version");

    ProcessBuilder pb = GCArguments.createJavaProcessBuilder(args.toArray(new String[0]));

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

    output.shouldHaveExitValue(0);

    String stdout = output.getStdout();

    return (new Long(getFlagValue("HeapBaseMinAddress", stdout)).longValue());

  }

  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());

  }

  private static boolean getFlagBoolValue(String flag, String where) {

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

    if (!m.find()) {

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

    }

    return m.group(1).equals("true");

  }

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

    // Tests

    // 1. Verify that MaxRAMPercentage overrides UseCompressedOops Ergo

    // 2. Verify that UseCompressedOops forces compressed oops limit even

    //    when other flags are specified.

    long oneG = 1L * 1024L * 1024L * 1024L;

    // Hotspot startup logic reduces MaxHeapForCompressedOops by HeapBaseMinAddress

    // in order to get zero based compressed oops offsets.

    long heapbaseminaddr = getHeapBaseMinAddress();

    long maxcoopheap = TestUseCompressedOopsErgoTools.getMaxHeapForCompressedOops(new String [0]) - heapbaseminaddr;

    // Args: MaxRAM , MaxRAMPercentage, forcecoop, expect heap, expect coop

    checkMaxRAMSize(maxcoopheap - oneG, 100, false, maxcoopheap - oneG, true);

    checkMaxRAMSize(maxcoopheap + oneG, 100, false, maxcoopheap + oneG, false);

    checkMaxRAMSize(maxcoopheap + oneG, 100, true, maxcoopheap, true);

  }

}