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Datei: g1RootClosures.cpp Sprache: C

/*
* 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 "gc/g1/g1OopClosures.inline.hpp"
#include "gc/g1/g1RootClosures.hpp"
#include "gc/g1/g1SharedClosures.hpp"

// Closures used for standard G1 evacuation.
class G1EvacuationClosures : public G1EvacuationRootClosures {
  G1SharedClosures<false> _closures;

public:
  G1EvacuationClosures(G1CollectedHeap* g1h,
                       G1ParScanThreadState* pss,
                       bool in_young_gc) :
      _closures(g1h, pss, in_young_gc) {}

  OopClosure* strong_oops() { return &_closures._oops; }

  CLDClosure* weak_clds()             { return &_closures._clds; }
  CLDClosure* strong_clds()           { return &_closures._clds; }

  CodeBlobClosure* strong_codeblobs()      { return &_closures._codeblobs; }
  CodeBlobClosure* weak_codeblobs()        { return &_closures._codeblobs; }
};

// Closures used during concurrent start.
// The treatment of "weak" roots is selectable through the template parameter,
// this is usually used to control unloading of classes and interned strings.
template <bool should_mark_weak>
class G1ConcurrentStartMarkClosures : public G1EvacuationRootClosures {
  G1SharedClosures<true>             _strong;
  G1SharedClosures<should_mark_weak> _weak;

public:
  G1ConcurrentStartMarkClosures(G1CollectedHeap* g1h,
                                G1ParScanThreadState* pss) :
      _strong(g1h, pss, /* process_only_dirty_klasses */ false),
      _weak(g1h, pss,   /* process_only_dirty_klasses */ false) {}

  OopClosure* strong_oops() { return &_strong._oops; }

  CLDClosure* weak_clds()             { return &_weak._clds; }
  CLDClosure* strong_clds()           { return &_strong._clds; }

  CodeBlobClosure* strong_codeblobs()      { return &_strong._codeblobs; }
  CodeBlobClosure* weak_codeblobs()        { return &_weak._codeblobs; }
};

G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) {
  G1EvacuationRootClosures* res = NULL;
  if (g1h->collector_state()->in_concurrent_start_gc()) {
    if (ClassUnloadingWithConcurrentMark) {
      res = new G1ConcurrentStartMarkClosures<false>(g1h, pss);
    } else {
      res = new G1ConcurrentStartMarkClosures<true>(g1h, pss);
    }
  } else {
    res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->in_young_only_phase());
  }
  return res;
}

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