src/hotspot/share/oops/markOop.inline.hpp
changeset 57811 947252a54b98
parent 57805 e62f402c337f
child 57812 9bb28ccc6106
--- a/src/hotspot/share/oops/markOop.inline.hpp	Tue Aug 20 11:15:23 2019 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,114 +0,0 @@
-/*
- * Copyright (c) 2006, 2019, 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_OOPS_MARKOOP_INLINE_HPP
-#define SHARE_OOPS_MARKOOP_INLINE_HPP
-
-#include "oops/klass.hpp"
-#include "oops/markOop.hpp"
-#include "oops/oop.inline.hpp"
-#include "runtime/globals.hpp"
-
-// Should this header be preserved during GC (when biased locking is enabled)?
-inline bool markWord::must_be_preserved_with_bias(oop obj_containing_mark) const {
-  assert(UseBiasedLocking, "unexpected");
-  if (has_bias_pattern()) {
-    // Will reset bias at end of collection
-    // Mark words of biased and currently locked objects are preserved separately
-    return false;
-  }
-  markWord prototype_header = prototype_for_object(obj_containing_mark);
-  if (prototype_header.has_bias_pattern()) {
-    // Individual instance which has its bias revoked; must return
-    // true for correctness
-    return true;
-  }
-  return (!is_unlocked() || !has_no_hash());
-}
-
-// Should this header be preserved during GC?
-inline bool markWord::must_be_preserved(oop obj_containing_mark) const {
-  if (!UseBiasedLocking)
-    return (!is_unlocked() || !has_no_hash());
-  return must_be_preserved_with_bias(obj_containing_mark);
-}
-
-// Should this header be preserved in the case of a promotion failure
-// during scavenge (when biased locking is enabled)?
-inline bool markWord::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const {
-  assert(UseBiasedLocking, "unexpected");
-  // We don't explicitly save off the mark words of biased and
-  // currently-locked objects during scavenges, so if during a
-  // promotion failure we encounter either a biased mark word or a
-  // klass which still has a biasable prototype header, we have to
-  // preserve the mark word. This results in oversaving, but promotion
-  // failures are rare, and this avoids adding more complex logic to
-  // the scavengers to call new variants of
-  // BiasedLocking::preserve_marks() / restore_marks() in the middle
-  // of a scavenge when a promotion failure has first been detected.
-  if (has_bias_pattern() ||
-      prototype_for_object(obj_containing_mark).has_bias_pattern()) {
-    return true;
-  }
-  return (!is_unlocked() || !has_no_hash());
-}
-
-// Should this header be preserved in the case of a promotion failure
-// during scavenge?
-inline bool markWord::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const {
-  if (!UseBiasedLocking)
-    return (!is_unlocked() || !has_no_hash());
-  return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark);
-}
-
-
-// Same as must_be_preserved_with_bias_for_promotion_failure() except that
-// it takes a Klass* argument, instead of the object of which this is the mark word.
-inline bool markWord::must_be_preserved_with_bias_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const {
-  assert(UseBiasedLocking, "unexpected");
-  // CMS scavenges preserve mark words in similar fashion to promotion failures; see above
-  if (has_bias_pattern() ||
-      klass_of_obj_containing_mark->prototype_header().has_bias_pattern()) {
-    return true;
-  }
-  return (!is_unlocked() || !has_no_hash());
-}
-
-// Same as must_be_preserved_for_promotion_failure() except that
-// it takes a Klass* argument, instead of the object of which this is the mark word.
-inline bool markWord::must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const {
-  if (!UseBiasedLocking)
-    return (!is_unlocked() || !has_no_hash());
-  return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
-}
-
-inline markWord markWord::prototype_for_object(oop obj) {
-#ifdef ASSERT
-  markWord prototype_header = obj->klass()->prototype_header();
-  assert(prototype_header == prototype() || prototype_header.has_bias_pattern(), "corrupt prototype header");
-#endif
-  return obj->klass()->prototype_header();
-}
-
-#endif // SHARE_OOPS_MARKOOP_INLINE_HPP