author | chegar |
Thu, 17 Oct 2019 20:53:35 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58678 | 9cf78a70fa4f |
parent 53244 | src/hotspot/share/oops/markOop.inline.hpp@9807daeb47c4 |
child 58679 | 9c3209ff7550 |
permissions | -rw-r--r-- |
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/* |
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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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// Same as must_be_preserved_for_promotion_failure(). |
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inline bool markWord::must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const { |
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return must_be_preserved_for_promotion_failure(klass_of_obj_containing_mark); |
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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 |