jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/markSweep.inline.hpp@7a102acc9f17

     1 /*

     2  * Copyright 2000-2008 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 MarkSweep::mark_object(oop obj) {

    26   // some marks may contain information we need to preserve so we store them away

    27   // and overwrite the mark.  We'll restore it at the end of markSweep.

    28   markOop mark = obj->mark();

    29   obj->set_mark(markOopDesc::prototype()->set_marked());

    31   if (mark->must_be_preserved(obj)) {

    32     preserve_mark(obj, mark);

    33   }

    34 }

    36 template <class T> inline void MarkSweep::follow_root(T* p) {

    37   assert(!Universe::heap()->is_in_reserved(p),

    38          "roots shouldn't be things within the heap");

    39 #ifdef VALIDATE_MARK_SWEEP

    40   if (ValidateMarkSweep) {

    41     guarantee(!_root_refs_stack->contains(p), "should only be in here once");

    42     _root_refs_stack->push(p);

    43   }

    44 #endif

    45   T heap_oop = oopDesc::load_heap_oop(p);

    46   if (!oopDesc::is_null(heap_oop)) {

    47     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    48     if (!obj->mark()->is_marked()) {

    49       mark_object(obj);

    50       obj->follow_contents();

    51     }

    52   }

    53   follow_stack();

    54 }

    56 template <class T> inline void MarkSweep::mark_and_follow(T* p) {

    57 //  assert(Universe::heap()->is_in_reserved(p), "should be in object space");

    58   T heap_oop = oopDesc::load_heap_oop(p);

    59   if (!oopDesc::is_null(heap_oop)) {

    60     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    61     if (!obj->mark()->is_marked()) {

    62       mark_object(obj);

    63       obj->follow_contents();

    64     }

    65   }

    66 }

    68 template <class T> inline void MarkSweep::mark_and_push(T* p) {

    69 //  assert(Universe::heap()->is_in_reserved(p), "should be in object space");

    70   T heap_oop = oopDesc::load_heap_oop(p);

    71   if (!oopDesc::is_null(heap_oop)) {

    72     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    73     if (!obj->mark()->is_marked()) {

    74       mark_object(obj);

    75       _marking_stack->push(obj);

    76     }

    77   }

    78 }

    80 template <class T> inline void MarkSweep::adjust_pointer(T* p, bool isroot) {

    81   T heap_oop = oopDesc::load_heap_oop(p);

    82   if (!oopDesc::is_null(heap_oop)) {

    83     oop obj     = oopDesc::decode_heap_oop_not_null(heap_oop);

    84     oop new_obj = oop(obj->mark()->decode_pointer());

    85     assert(new_obj != NULL ||                         // is forwarding ptr?

    86            obj->mark() == markOopDesc::prototype() || // not gc marked?

    87            (UseBiasedLocking && obj->mark()->has_bias_pattern()) ||

    88                                                       // not gc marked?

    89            obj->is_shared(),                          // never forwarded?

    90            "should be forwarded");

    91     if (new_obj != NULL) {

    92       assert(Universe::heap()->is_in_reserved(new_obj),

    93              "should be in object space");

    94       oopDesc::encode_store_heap_oop_not_null(p, new_obj);

    95     }

    96   }

    97   VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot));

    98 }

   100 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {

   101 #ifdef VALIDATE_MARK_SWEEP

   102   if (ValidateMarkSweep) {

   103     if (!Universe::heap()->is_in_reserved(p)) {

   104       _root_refs_stack->push(p);

   105     } else {

   106       _other_refs_stack->push(p);

   107     }

   108   }

   109 #endif

   110   mark_and_push(p);

   111 }

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