src/hotspot/share/gc/z/zRelocationSet.inline.hpp

/*
 * Copyright (c) 2017, 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.
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#ifndef SHARE_GC_Z_ZRELOCATIONSET_INLINE_HPP
#define SHARE_GC_Z_ZRELOCATIONSET_INLINE_HPP

#include "gc/z/zRelocationSet.hpp"
#include "runtime/atomic.hpp"

template <bool parallel>
inline ZRelocationSetIteratorImpl<parallel>::ZRelocationSetIteratorImpl(ZRelocationSet* relocation_set) :
    _relocation_set(relocation_set),
    _next(0) {}

template <bool parallel>
inline bool ZRelocationSetIteratorImpl<parallel>::next(ZForwarding** forwarding) {
  const size_t nforwardings = _relocation_set->_nforwardings;

  if (parallel) {
    if (_next < nforwardings) {
      const size_t next = Atomic::add(1u, &_next) - 1u;
      if (next < nforwardings) {
        *forwarding = _relocation_set->_forwardings[next];
        return true;
      }
    }
  } else {
    if (_next < nforwardings) {
      *forwarding = _relocation_set->_forwardings[_next++];
      return true;
    }
  }

  return false;
}

#endif // SHARE_GC_Z_ZRELOCATIONSET_INLINE_HPP