/*
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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
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 * 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).
 *
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 * 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
 * @key regression
 * @bug 8012015
 * @summary Make sure reserved (but uncommitted) memory is not accessible
 * @library /testlibrary /../../test/lib
 * @modules java.base/sun.misc
 *          java.management
 * @build ReserveMemory
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main ReserveMemory
 */

import jdk.test.lib.*;

import sun.hotspot.WhiteBox;

public class ReserveMemory {
  private static boolean isWindows() {
    return System.getProperty("os.name").toLowerCase().startsWith("win");
  }

  private static boolean isOsx() {
    return System.getProperty("os.name").toLowerCase().startsWith("mac");
  }

  public static void main(String args[]) throws Exception {
    if (args.length > 0) {
      WhiteBox.getWhiteBox().readReservedMemory();

      throw new Exception("Read of reserved/uncommitted memory unexpectedly succeeded, expected crash!");
    }

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
          "-Xbootclasspath/a:.",
          "-XX:+UnlockDiagnosticVMOptions",
          "-XX:+WhiteBoxAPI",
          "-XX:-TransmitErrorReport",
          "-XX:-CreateCoredumpOnCrash",
          "-Xmx32m",
          "ReserveMemory",
          "test");

    OutputAnalyzer output = new OutputAnalyzer(pb.start());
    if (isWindows()) {
      output.shouldContain("EXCEPTION_ACCESS_VIOLATION");
    } else if (isOsx()) {
      output.shouldContain("SIGBUS");
    } else {
      output.shouldContain("SIGSEGV");
    }
  }
}