/*

 * Copyright (c) 2015, 2018, 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/flags/jvmFlag.hpp"

#include "runtime/flags/jvmFlagConstraintsRuntime.hpp"

#include "runtime/globals.hpp"

#include "runtime/safepointMechanism.hpp"

#include "runtime/task.hpp"

JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {

  if (!is_power_of_2(value)) {

    JVMFlag::printError(verbose,

                        "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "

                        "power of 2\n",

                        value);

    return JVMFlag::VIOLATES_CONSTRAINT;

  }

  // In case page size is very small.

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

    JVMFlag::printError(verbose,

                        "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "

                        "less than page size (%d)\n",

                        value, os::vm_page_size());

    return JVMFlag::VIOLATES_CONSTRAINT;

  }

  return JVMFlag::SUCCESS;

}

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

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

JVMFlag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {

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

    JVMFlag::printError(verbose,

                        "ContendedPaddingWidth (" INTX_FORMAT ") must be "

                        "a multiple of %d\n",

                        value, BytesPerLong);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {

  if (value > BiasedLockingBulkRevokeThreshold) {

    JVMFlag::printError(verbose,

                        "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "

                        "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",

                        value, BiasedLockingBulkRevokeThreshold);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {

  if ((value % PeriodicTask::interval_gran) != 0) {

    JVMFlag::printError(verbose,

                        "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "

                        "evenly divisible by PeriodicTask::interval_gran (%d)\n",

                        value, PeriodicTask::interval_gran);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {

  if (value < BiasedLockingBulkRebiasThreshold) {

    JVMFlag::printError(verbose,

                        "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "

                        "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",

                        value, BiasedLockingBulkRebiasThreshold);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {

    JVMFlag::printError(verbose,

                        "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"

                        " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "

                        "less than or equal to 0.1\n",

                        value, BiasedLockingBulkRebiasThreshold);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {

  if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {

    JVMFlag::printError(verbose,

                        "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"

                        " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "

                        "less than or equal to 0.1\n",

                        BiasedLockingBulkRebiasThreshold, value);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {

  if ((value % PeriodicTask::interval_gran != 0)) {

    JVMFlag::printError(verbose,

                        "PerfDataSamplingInterval (" INTX_FORMAT ") must be "

                        "evenly divisible by PeriodicTask::interval_gran (%d)\n",

                        value, PeriodicTask::interval_gran);

    return JVMFlag::VIOLATES_CONSTRAINT;

  } else {

    return JVMFlag::SUCCESS;

  }

}

JVMFlag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {

  if (value) {

    if (!SafepointMechanism::supports_thread_local_poll()) {

      JVMFlag::printError(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");

      return JVMFlag::VIOLATES_CONSTRAINT;

    }

  }

  return JVMFlag::SUCCESS;

}