jdk8-mips64-public/hotspot: src/share/vm/oops/oop.pcgc.inline.hpp@75b0f3cb1943

     1 /*

     2  * Copyright 2005-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 inline void oopDesc::update_contents(ParCompactionManager* cm) {

    26   // The klass field must be updated before anything else

    27   // can be done.

    28   DEBUG_ONLY(klassOopDesc* original_klass = klass());

    30   // Can the option to update and/or copy be moved up in the

    31   // call chain to avoid calling into here?

    33   if (PSParallelCompact::should_update_klass(klass())) {

    34     update_header();

    35     assert(klass()->is_klass(), "Not updated correctly");

    36   } else {

    37     assert(klass()->is_klass(), "Not updated");

    38   }

    40   Klass* new_klass = blueprint();

    41   if (!new_klass->oop_is_typeArray()) {

    42     // It might contain oops beyond the header, so take the virtual call.

    43     new_klass->oop_update_pointers(cm, this);

    44   }

    45   // Else skip it.  The typeArrayKlass in the header never needs scavenging.

    46 }

    48 inline void oopDesc::update_contents(ParCompactionManager* cm,

    49                                      HeapWord* begin_limit,

    50                                      HeapWord* end_limit) {

    51   // The klass field must be updated before anything else

    52   // can be done.

    53   debug_only(klassOopDesc* original_klass = klass());

    55   update_contents(cm, klass(), begin_limit, end_limit);

    56 }

    58 inline void oopDesc::update_contents(ParCompactionManager* cm,

    59                                      klassOop old_klass,

    60                                      HeapWord* begin_limit,

    61                                      HeapWord* end_limit) {

    63   klassOop updated_klass =

    64     PSParallelCompact::summary_data().calc_new_klass(old_klass);

    66   // Needs to be boundary aware for the 64 bit case

    67   // update_header();

    68   // The klass has moved.  Is the location of the klass

    69   // within the limits?

    70   if ((((HeapWord*)&_klass) >= begin_limit) &&

    71       (((HeapWord*)&_klass) < end_limit)) {

    72     set_klass(updated_klass);

    73   }

    75   Klass* klass = updated_klass->klass_part();

    76   if (!klass->oop_is_typeArray()) {

    77     // It might contain oops beyond the header, so take the virtual call.

    78     klass->oop_update_pointers(cm, this, begin_limit, end_limit);

    79   }

    80   // Else skip it.  The typeArrayKlass in the header never needs scavenging.

    81 }

    83 inline void oopDesc::follow_contents(ParCompactionManager* cm) {

    84   assert (PSParallelCompact::mark_bitmap()->is_marked(this),

    85     "should be marked");

    86   blueprint()->oop_follow_contents(cm, this);

    87 }

    89 // Used by parallel old GC.

    91 inline void oopDesc::follow_header(ParCompactionManager* cm) {

    92   PSParallelCompact::mark_and_push(cm, (oop*)&_klass);

    93 }

    95 inline oop oopDesc::forward_to_atomic(oop p) {

    96   assert(ParNewGeneration::is_legal_forward_ptr(p),

    97          "illegal forwarding pointer value.");

    98   markOop oldMark = mark();

    99   markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);

   100   markOop curMark;

   102   assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");

   103   assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");

   105   while (!is_forwarded()) {

   106     curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);

   107     if (curMark == oldMark) {

   108       assert(is_forwarded(), "the CAS should have succeeded.");

   109       return NULL;

   110     }

   111     oldMark = curMark;

   112   }

   113   return forwardee();

   114 }

   116 inline void oopDesc::update_header() {

   117   PSParallelCompact::adjust_pointer((oop*)&_klass);

   118 }

   120 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) {

   121   PSParallelCompact::adjust_pointer((oop*)&_klass, beg_addr, end_addr);

   122 }

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