JDK14/Java14源码在线阅读

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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#include "gc/g1/g1CodeBlobClosure.hpp"
#include "gc/g1/g1OopClosures.hpp"
#include "memory/iterator.hpp"

class G1CollectedHeap;
class G1ParScanThreadState;

// Simple holder object for a complete set of closures used by the G1 evacuation code.
template <G1Mark Mark>
class G1SharedClosures {
  static bool needs_strong_processing() {
    // Request strong code root processing when G1MarkFromRoot is passed in during
    // initial mark.
    return Mark == G1MarkFromRoot;
  }
public:
  G1ParCopyClosure<G1BarrierNone, Mark> _oops;
  G1ParCopyClosure<G1BarrierCLD,  Mark> _oops_in_cld;
  // We do not need (and actually should not) collect oops from nmethods into the
  // optional collection set as we already automatically collect the corresponding
  // nmethods in the region's strong code roots set. So set G1BarrierNoOptRoots in
  // this closure.
  // If these were present there would be opportunity for multiple threads to try
  // to change this oop* at the same time. Since embedded oops are not necessarily
  // word-aligned, this could lead to word tearing during update and crashes.
  G1ParCopyClosure<G1BarrierNoOptRoots, Mark> _oops_in_nmethod;

  G1CLDScanClosure                _clds;
  G1CodeBlobClosure               _codeblobs;


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