/*
 * Copyright (c) 2021, Alibaba Group Holding Limited. 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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#include "gc/serial/defNewGeneration.hpp"
#include "gc/serial/serialHeap.hpp"
#include "gc/serial/serialStringDedup.hpp"
#include "oops/oop.inline.hpp"

bool SerialStringDedup::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 SerialHeap::heap()->young_gen()->is_in_reserved(java_string) &&
         StringDedup::is_below_threshold_age(java_string->age());
}