79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/*
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* Copyright (c) 2006, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_OOPS_MARKWORD_INLINE_HPP
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#define SHARE_OOPS_MARKWORD_INLINE_HPP
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#include "oops/klass.hpp"
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#include "oops/markWord.hpp"
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#include "runtime/globals.hpp"
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// Should this header be preserved during GC?
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template <typename KlassProxy>
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inline bool markWord::must_be_preserved(KlassProxy klass) const {
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if (UseBiasedLocking) {
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if (has_bias_pattern()) {
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// Will reset bias at end of collection
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// Mark words of biased and currently locked objects are preserved separately
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return false;
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}
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markWord prototype_header = prototype_for_klass(klass);
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if (prototype_header.has_bias_pattern()) {
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// Individual instance which has its bias revoked; must return
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// true for correctness
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return true;
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}
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}
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return (!is_unlocked() || !has_no_hash());
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}
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// Should this header be preserved in the case of a promotion failure during scavenge?
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template <typename KlassProxy>
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inline bool markWord::must_be_preserved_for_promotion_failure(KlassProxy klass) const {
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if (UseBiasedLocking) {
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// We don't explicitly save off the mark words of biased and
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// currently-locked objects during scavenges, so if during a
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// promotion failure we encounter either a biased mark word or a
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// klass which still has a biasable prototype header, we have to
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// preserve the mark word. This results in oversaving, but promotion
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// failures are rare, and this avoids adding more complex logic to
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// the scavengers to call new variants of
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// BiasedLocking::preserve_marks() / restore_marks() in the middle
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// of a scavenge when a promotion failure has first been detected.
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if (has_bias_pattern() || prototype_for_klass(klass).has_bias_pattern()) {
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return true;
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}
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}
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return (!is_unlocked() || !has_no_hash());
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}
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inline markWord markWord::prototype_for_klass(const Klass* klass) {
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markWord prototype_header = klass->prototype_header();
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assert(prototype_header == prototype() || prototype_header.has_bias_pattern(), "corrupt prototype header");
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return prototype_header;
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}
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#endif // SHARE_OOPS_MARKWORD_INLINE_HPP
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