gt:     if (actualHeapSize > expectedHeapSize) {
context: /*
  * Copyright (c) 2013, 2015, 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.
  */
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  import java.util.ArrayList;
  import java.util.Arrays;
  
  import jdk.test.lib.*;
  import sun.hotspot.WhiteBox;
  
  class ErgoArgsPrinter {
    public static void main(String[] args) throws Exception {
      WhiteBox wb = WhiteBox.getWhiteBox();
      wb.printHeapSizes();
    }
  }
  
  final class MinInitialMaxValues {
    public long minHeapSize;
    public long initialHeapSize;
    public long maxHeapSize;
  
    public long spaceAlignment;
    public long heapAlignment;
  }
  
  class TestMaxHeapSizeTools {
  
    public static void checkMinInitialMaxHeapFlags(String gcflag) throws Exception {
      checkInvalidMinInitialHeapCombinations(gcflag);
      checkValidMinInitialHeapCombinations(gcflag);
      checkInvalidInitialMaxHeapCombinations(gcflag);
      checkValidInitialMaxHeapCombinations(gcflag);
    }
  
    public static void checkMinInitialErgonomics(String gcflag) throws Exception {
      // heap sizing ergonomics use the value NewSize + OldSize as default values
      // for ergonomics calculation. Retrieve these values.
      long[] values = new long[2];
      getNewOldSize(gcflag, values);
  
      // we check cases with values smaller and larger than this default value.
      long newPlusOldSize = values[0] + values[1];
      long smallValue = newPlusOldSize / 2;
      long largeValue = newPlusOldSize * 2;
      long maxHeapSize = largeValue + (2 * 1024 * 1024);
  
      // -Xms is not set
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize }, values, -1, -1);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=" + smallValue }, values, -1, smallValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=" + largeValue }, values, -1, largeValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=0" }, values, -1, -1);
  
      // -Xms is set to zero
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0" }, values, -1, -1);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=" + smallValue }, values, -1, smallValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=" + largeValue }, values, -1, largeValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=0" }, values, -1, -1);
  
      // -Xms is set to small value
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue }, values, -1, -1);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=" + smallValue }, values, smallValue, smallValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=" + largeValue }, values, smallValue, largeValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=0" }, values, smallValue, -1);
  
      // -Xms is set to large value
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + largeValue }, values, largeValue, largeValue);
      checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + largeValue, "-XX:InitialHeapSize=0" }, values, largeValue, -1);
    }
  
    private static long align_up(long value, long alignment) {
      long alignmentMinusOne = alignment - 1;
      return (value + alignmentMinusOne) & ~alignmentMinusOne;
    }
  
    private static void getNewOldSize(String gcflag, long[] values) throws Exception {
      ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag,
        "-XX:+PrintFlagsFinal", "-version");
      OutputAnalyzer output = new OutputAnalyzer(pb.start());
      output.shouldHaveExitValue(0);
  
      String stdout = output.getStdout();
      values[0] = getFlagValue(" NewSize", stdout);
      values[1] = getFlagValue(" OldSize", stdout);
    }
  
    public static void checkGenMaxHeapErgo(String gcflag) throws Exception {
      TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 3);
      TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 4);
      TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 5);
    }
  
    private static void checkInvalidMinInitialHeapCombinations(String gcflag) throws Exception {
      expectError(new String[] { gcflag, "-Xms64M", "-XX:InitialHeapSize=32M", "-version" });
    }
  
    private static void checkValidMinInitialHeapCombinations(String gcflag) throws Exception {
      expectValid(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-Xms4M", "-version" });
      expectValid(new String[] { gcflag, "-Xms4M", "-XX:InitialHeapSize=8M", "-version" });
      expectValid(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-Xms8M", "-version" });
      // the following is not an error as -Xms sets both minimal and initial heap size
      expectValid(new String[] { gcflag, "-XX:InitialHeapSize=4M", "-Xms8M", "-version" });
    }
  
    private static void checkInvalidInitialMaxHeapCombinations(String gcflag) throws Exception {
      expectError(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=8M", "-version" });
      expectError(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-XX:MaxHeapSize=4M", "-version" });
    }
  
    private static void checkValidInitialMaxHeapCombinations(String gcflag) throws Exception {
      expectValid(new String[] { gcflag, "-XX:InitialHeapSize=4M", "-XX:MaxHeapSize=8M", "-version" });
      expectValid(new String[] { gcflag, "-XX:MaxHeapSize=8M", "-XX:InitialHeapSize=4M", "-version" });
      expectValid(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=4M", "-version" });
      // a value of "0" for initial heap size means auto-detect
      expectValid(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=0M", "-version" });
    }
  
    private static long valueAfter(String source, String match) {
      int start = source.indexOf(match) + match.length();
      String tail = source.substring(start).split(" ")[0];
      return Long.parseLong(tail);
    }
  
    /**
     * Executes a new VM process with the given class and parameters.
     * @param vmargs Arguments to the VM to run
     * @param classname Name of the class to run
     * @param arguments Arguments to the class
     * @param useTestDotJavaDotOpts Use test.java.opts as part of the VM argument string
     * @return The OutputAnalyzer with the results for the invocation.
     */
    public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments, boolean useTestDotJavaDotOpts) throws Exception {
      ArrayList<String> finalargs = new ArrayList<String>();
  
      String[] whiteboxOpts = new String[] {
        "-Xbootclasspath/a:.",
        "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
        "-cp", System.getProperty("java.class.path"),
      };
  
      if (useTestDotJavaDotOpts) {
        // System.getProperty("test.java.opts") is '' if no options is set,
        // we need to skip such a result
        String[] externalVMOpts = new String[0];
        if (System.getProperty("test.java.opts") != null && System.getProperty("test.java.opts").length() != 0) {
          externalVMOpts = System.getProperty("test.java.opts").split(" ");
        }
        finalargs.addAll(Arrays.asList(externalVMOpts));
      }
  
      finalargs.addAll(Arrays.asList(vmargs));
      finalargs.addAll(Arrays.asList(whiteboxOpts));
      finalargs.add(classname);
      finalargs.addAll(Arrays.asList(arguments));
  
      ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));
      OutputAnalyzer output = new OutputAnalyzer(pb.start());
      output.shouldHaveExitValue(0);
  
      return output;
    }
  
    private static void getMinInitialMaxHeap(String[] args, MinInitialMaxValues val) throws Exception {
      OutputAnalyzer output = runWhiteBoxTest(args, ErgoArgsPrinter.class.getName(), new String[] {}, false);
  
      // the output we watch for has the following format:
      //
      // "Minimum heap X Initial heap Y Maximum heap Z Min alignment A Max Alignment B"
      //
      // where A, B, X, Y and Z are sizes in bytes.
      // Unfortunately there is no other way to retrieve the minimum heap size and
      // the alignments.
  
      Matcher m = Pattern.compile("Minimum heap \\d+ Initial heap \\d+ Maximum heap \\d+ Space alignment \\d+ Heap alignment \\d+").
        matcher(output.getStdout());
      if (!m.find()) {
        throw new RuntimeException("Could not find heap size string.");
      }
  
      String match = m.group();
  
      // actual values
      val.minHeapSize = valueAfter(match, "Minimum heap ");
      val.initialHeapSize = valueAfter(match, "Initial heap ");
      val.maxHeapSize = valueAfter(match, "Maximum heap ");
      val.spaceAlignment = valueAfter(match, "Space alignment ");
      val.heapAlignment = valueAfter(match, "Heap alignment ");
    }
  
    /**
     * Verify whether the VM automatically synchronizes minimum and initial heap size if only
     * one is given for the GC specified.
     */
    public static void checkErgonomics(String[] args, long[] newoldsize,
      long expectedMin, long expectedInitial) throws Exception {
  
      MinInitialMaxValues v = new MinInitialMaxValues();
      getMinInitialMaxHeap(args, v);
  
      if ((expectedMin != -1) && (align_up(expectedMin, v.heapAlignment) != v.minHeapSize)) {
        throw new RuntimeException("Actual minimum heap size of " + v.minHeapSize +
          " differs from expected minimum heap size of " + expectedMin);
      }
  
      if ((expectedInitial != -1) && (align_up(expectedInitial, v.heapAlignment) != v.initialHeapSize)) {
        throw new RuntimeException("Actual initial heap size of " + v.initialHeapSize +
          " differs from expected initial heap size of " + expectedInitial);
      }
  
      // always check the invariant min <= initial <= max heap size
      if (!(v.minHeapSize <= v.initialHeapSize && v.initialHeapSize <= v.maxHeapSize)) {
        throw new RuntimeException("Inconsistent min/initial/max heap sizes, they are " +
          v.minHeapSize + "/" + v.initialHeapSize + "/" + v.maxHeapSize);
      }
    }
  
    /**
     * Verify whether the VM respects the given maximum heap size in MB for the
     * GC specified.
     * @param gcflag The garbage collector to test as command line flag. E.g. -XX:+UseG1GC
     * @param maxHeapSize the maximum heap size to verify, in MB.
     */
    public static void checkGenMaxHeapSize(String gcflag, long maxHeapsize) throws Exception {
      final long K = 1024;
  
      MinInitialMaxValues v = new MinInitialMaxValues();
      getMinInitialMaxHeap(new String[] { gcflag, "-XX:MaxHeapSize=" + maxHeapsize + "M" }, v);
  
      long expectedHeapSize = align_up(maxHeapsize * K * K, v.heapAlignment);
      long actualHeapSize = v.maxHeapSize;
  
  