/*

 * Copyright (c) 2016, 2019, 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

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 */

#ifndef SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP

#define SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP

#include "jfr/utilities/jfrTypes.hpp"

#include "runtime/atomic.hpp"

#include "runtime/orderAccess.hpp"

#include "utilities/macros.hpp"

#ifdef VM_LITTLE_ENDIAN

static const int low_offset = 0;

static const int meta_offset = low_offset + 1;

#else

static const int low_offset = 7;

static const int meta_offset = low_offset - 1;

#endif

  assert(dest != NULL, "invariant");

  if (bits != (*dest & bits)) {

    *dest |= bits;

  }

}

inline jbyte traceid_and(jbyte current, jbyte bits) {

  return current & bits;

}

inline jbyte traceid_or(jbyte current, jbyte bits) {

  return current | bits;

}

inline jbyte traceid_xor(jbyte current, jbyte bits) {

  return current ^ bits;

}

template <jbyte op(jbyte, jbyte)>

inline void set_bits_cas_form(jbyte bits, jbyte* const dest) {

  assert(dest != NULL, "invariant");

  do {

    const jbyte current = *dest;

    const jbyte new_value = op(current, bits);

    if (Atomic::cmpxchg(new_value, dest, current) == current) {

      return;

    }

  } while (true);

}

inline void set_bits_cas(jbyte bits, jbyte* const dest) {

  set_bits_cas_form<traceid_or>(bits, dest);

}

inline void clear_bits_cas(jbyte bits, jbyte* const dest) {

  set_bits_cas_form<traceid_xor>(bits, dest);

}

inline void set_mask(jbyte mask, jbyte* const dest) {

  set_bits_cas_form<traceid_and>(mask, dest);

}

inline void set_traceid_bits(jbyte bits, traceid* dest) {

  set_bits(bits, ((jbyte*)dest) + low_offset);

}

inline void set_traceid_bits_cas(jbyte bits, traceid* dest) {

  set_bits_cas(bits, ((jbyte*)dest) + low_offset);

}

inline void set_traceid_mask(jbyte mask, traceid* dest) {

  set_mask(mask, ((jbyte*)dest) + low_offset);

}

inline void set_meta_bits(jbyte bits, jbyte* const dest) {

  assert(dest != NULL, "invariant");

  *dest |= bits;

}

inline void set_traceid_meta_bits(jbyte bits, traceid* dest) {

  set_meta_bits(bits, ((jbyte*)dest) + meta_offset);

}

inline void set_meta_mask(jbyte mask, jbyte* const dest) {

  assert(dest != NULL, "invariant");

  *dest &= mask;

}

inline void set_traceid_meta_mask(jbyte mask, traceid* dest) {

  set_meta_mask(mask, ((jbyte*)dest) + meta_offset);

}

// only used by a single thread with no visibility requirements

inline void clear_meta_bits(jbyte bits, jbyte* const dest) {

  assert(dest != NULL, "invariant");

  *dest ^= bits;

}

#endif // SHARE_JFR_RECORDER_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP