jdk8-mips64-public/hotspot: src/share/vm/oops/markOop.inline.hpp@a79cb7c55012 (annotated)

src/share/vm/oops/markOop.inline.hpp@a79cb7c55012 (annotated)

src/share/vm/oops/markOop.inline.hpp

Wed, 25 Jan 2012 17:40:51 -0500

author: jiangli
date: Wed, 25 Jan 2012 17:40:51 -0500
changeset 3526: a79cb7c55012
parent 2380: 74ee0db180fa
child 4037: da91efe96a93
permissions: -rw-r--r--

7132690: InstanceKlass:_reference_type should be u1 type
Summary: Change InstanceKlass::_reference_type to u1 type.
Reviewed-by: dholmes, coleenp, acorn
Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>

 /*
  * Copyright (c) 2006, 2010, 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_VM_OOPS_MARKOOP_INLINE_HPP
 #define SHARE_VM_OOPS_MARKOOP_INLINE_HPP
 #include "oops/klass.hpp"
 #include "oops/klassOop.hpp"
 #include "oops/markOop.hpp"
 #include "runtime/globals.hpp"
 // Should this header be preserved during GC (when biased locking is enabled)?
 inline bool markOopDesc::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;
   }
   markOop 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 markOopDesc::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 markOopDesc::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 markOopDesc::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 klassOop argument, instead of the object of which this is the mark word.
 inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(klassOop 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->klass_part()->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 klassOop argument, instead of the object of which this is the mark word.
 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop 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 markOop markOopDesc::prototype_for_object(oop obj) {
 #ifdef ASSERT
   markOop prototype_header = obj->klass()->klass_part()->prototype_header();
   assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
 #endif
   return obj->klass()->klass_part()->prototype_header();
 }
 #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/markOop.inline.hpp@a79cb7c55012 (annotated)

src/share/vm/oops/markOop.inline.hpp