/*
 * Copyright (c) 2013, 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 TestObjectAlignment
 * @key gc
 * @bug 8021823
 * @summary G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
 * @library /testlibrary
 * @run main/othervm TestObjectAlignment
 */

import com.oracle.java.testlibrary.ProcessTools;
import com.oracle.java.testlibrary.OutputAnalyzer;

public class TestObjectAlignment {

  private static boolean runsOn32bit() {
    return System.getProperty("sun.arch.data.model").equals("32");
  }

  public static void runTest(int objectAlignment) throws Exception {
    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
                                                              "-Xmx20M",
                                                              "-XX:+ExplicitGCInvokesConcurrent",
                                                              "-XX:ObjectAlignmentInBytes=" + objectAlignment,
                                                              TestObjectAlignmentTest.class.getName());
    OutputAnalyzer output = new OutputAnalyzer(pb.start());
    output.shouldHaveExitValue(0);
  }

  public static void main(String[] args) throws Exception {
    if (runsOn32bit()) {
      // 32 bit VMs do not allow setting ObjectAlignmentInBytes.
      return;
    }
    runTest(8);
    runTest(16);
    runTest(32);
    runTest(64);
    runTest(128);
    runTest(256);
  }

  static class TestObjectAlignmentTest {
    static byte[] garbage;

    public static void main(String [] args) {
      for (int i = 0; i < 100; i++) {
        garbage = new byte[1000];
        System.gc();
      }
    }
  }
}