/*

 * Copyright (c) 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.

 *

 */

#include "precompiled.hpp"

#include "runtime/arguments.hpp"

#include "runtime/commandLineFlagConstraintsRuntime.hpp"

#include "runtime/globals.hpp"

#include "utilities/defaultStream.hpp"

Flag::Error ObjectAlignmentInBytesConstraintFunc(bool verbose, intx* value) {

  if (!is_power_of_2(*value)) {

    if (verbose == true) {

      jio_fprintf(defaultStream::error_stream(),

                "ObjectAlignmentInBytes=" INTX_FORMAT " must be power of 2\n",

                *value);

    }

    return Flag::VIOLATES_CONSTRAINT;

  }

  // In case page size is very small.

  if (*value >= (intx)os::vm_page_size()) {

    if (verbose == true) {

      jio_fprintf(defaultStream::error_stream(),

                "ObjectAlignmentInBytes=" INTX_FORMAT " must be less than page size " INTX_FORMAT "\n",

                *value, (intx)os::vm_page_size());

    }

    return Flag::VIOLATES_CONSTRAINT;

  }

  return Flag::SUCCESS;

}

// Need to enforce the padding not to break the existing field alignments.

// It is sufficient to check against the largest type size.

Flag::Error ContendedPaddingWidthConstraintFunc(bool verbose, intx* value) {

  if ((*value != 0) && ((*value % BytesPerLong) != 0)) {

    if (verbose == true) {

      jio_fprintf(defaultStream::error_stream(),

                "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",

                *value, BytesPerLong);

    }

    return Flag::VIOLATES_CONSTRAINT;

  } else {

    return Flag::SUCCESS;

  }

}