/*

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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

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 *

 * 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

 * @summary Test that touching noaccess area in class ReservedHeapSpace results in SIGSEGV/ACCESS_VIOLATION

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main ReadFromNoaccessArea

 */

import jdk.test.lib.Platform;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import sun.hotspot.WhiteBox;

public class ReadFromNoaccessArea {

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

    if (!Platform.is64bit()) {

      System.out.println("ReadFromNoaccessArea tests is useful only on 64bit architecture. Passing silently.");

      return;

    }

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

          "-Xbootclasspath/a:.",

          "-XX:+UnlockDiagnosticVMOptions",

          "-XX:+WhiteBoxAPI",

          "-XX:+UseCompressedOops",

          "-XX:HeapBaseMinAddress=33G",

          "-XX:-CreateCoredumpOnCrash",

          "-Xmx32m",

          DummyClassWithMainTryingToReadFromNoaccessArea.class.getName());

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

    System.out.println("******* Printing stdout for analysis in case of failure *******");

    System.out.println(output.getStdout());

    System.out.println("******* Printing stderr for analysis in case of failure *******");

    System.out.println(output.getStderr());

    System.out.println("***************************************************************");

    if (output.getStdout() != null && output.getStdout().contains("WB_ReadFromNoaccessArea method is useless")) {

      // Test conditions broken. There is no protected page in ReservedHeapSpace in these circumstances. Silently passing test.

      return;

    }

    if (Platform.isWindows()) {

      output.shouldContain("EXCEPTION_ACCESS_VIOLATION");

    } else if (Platform.isOSX()) {

      output.shouldContain("SIGBUS");

    } else {

      output.shouldContain("SIGSEGV");

    }

  }

  public static class DummyClassWithMainTryingToReadFromNoaccessArea {

    // This method calls whitebox method reading from noaccess area

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

      WhiteBox.getWhiteBox().readFromNoaccessArea();

      throw new Exception("Call of readFromNoaccessArea succeeded! This is wrong. Crash expected. Test failed.");

    }

  }

}