src/hotspot/share/gc/parallel/psStringDedup.hpp - master - githubmirror/panama-vector

src/hotspot/share/gc/parallel/psStringDedup.hpp

50 строк2 KB

Ivan Walulya

8267185: Add string deduplication support to ParallelGC

20 авг 2021, 14:30

20 авг 2021, 14:30fb1dfc6

/*
 * Copyright (c) 2021, 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.
 *
 */

#ifndef SHARE_GC_PARALLEL_PSSTRINGDEDUP_HPP
#define SHARE_GC_PARALLEL_PSSTRINGDEDUP_HPP

#include "gc/parallel/psScavenge.hpp"
#include "gc/shared/stringdedup/stringDedup.hpp"
#include "memory/allStatic.hpp"
#include "oops/oopsHierarchy.hpp"

class psStringDedup : AllStatic {
public:
  static bool is_candidate_from_mark(oop java_string) {
    // Candidate if string is being evacuated from young to old but has not
    // reached the deduplication age threshold, i.e. has not previously been a
    // candidate during its life in the young generation.
    return PSScavenge::is_obj_in_young(java_string) &&
           StringDedup::is_below_threshold_age(java_string->age());
  }

  static bool is_candidate_from_evacuation(oop obj,
                                           bool obj_is_tenured) {
    return obj_is_tenured ?
           StringDedup::is_below_threshold_age(obj->age()) :
           StringDedup::is_threshold_age(obj->age());
  }
};
#endif // SHARE_GC_PARALLEL_PSSTRINGDEDUP_HPP