jdk8-mips64-public/hotspot: src/share/vm/oops/oop.pcgc.inline.hpp@e6b1331a51d2

7086585: make Java field injection more flexible
Reviewed-by: jrose, twisti, kvn, coleenp

     1 /*

     2  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

    26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

    28 #ifndef SERIALGC

    29 #include "gc_implementation/parNew/parNewGeneration.hpp"

    30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"

    31 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"

    32 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"

    33 #include "gc_implementation/parallelScavenge/psScavenge.hpp"

    34 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"

    35 #endif

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

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

    39   // can be done.

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

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

    43   // call chain to avoid calling into here?

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

    46     update_header();

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

    48   } else {

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

    50   }

    52   Klass* new_klass = blueprint();

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

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

    55     new_klass->oop_update_pointers(cm, this);

    56   }

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

    58 }

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

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

    62     "should be marked");

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

    64 }

    66 // Used by parallel old GC.

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

    69   if (UseCompressedOops) {

    70     PSParallelCompact::mark_and_push(cm, compressed_klass_addr());

    71   } else {

    72     PSParallelCompact::mark_and_push(cm, klass_addr());

    73   }

    74 }

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

    77   assert(ParNewGeneration::is_legal_forward_ptr(p),

    78          "illegal forwarding pointer value.");

    79   markOop oldMark = mark();

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

    81   markOop curMark;

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

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

    86   while (!oldMark->is_marked()) {

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

    88     assert(is_forwarded(), "object should have been forwarded");

    89     if (curMark == oldMark) {

    90       return NULL;

    91     }

    92     // If the CAS was unsuccessful then curMark->is_marked()

    93     // should return true as another thread has CAS'd in another

    94     // forwarding pointer.

    95     oldMark = curMark;

    96   }

    97   return forwardee();

    98 }

   100 inline void oopDesc::update_header() {

   101   if (UseCompressedOops) {

   102     PSParallelCompact::adjust_pointer(compressed_klass_addr());

   103   } else {

   104     PSParallelCompact::adjust_pointer(klass_addr());

   105   }

   106 }

   108 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

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