jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp@5f429ee79634

     1 /*

     2  * Copyright (c) 2001, 2010, 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

    21  * questions.

    22  *

    23  */

    25 inline size_t G1RemSet::n_workers() {

    26   if (_g1->workers() != NULL) {

    27     return _g1->workers()->total_workers();

    28   } else {

    29     return 1;

    30   }

    31 }

    33 template <class T> inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, T* p) {

    34   par_write_ref_nv(from, p, 0);

    35 }

    37 inline bool HRInto_G1RemSet::self_forwarded(oop obj) {

    38   bool result =  (obj->is_forwarded() && (obj->forwardee()== obj));

    39   return result;

    40 }

    42 template <class T> inline void HRInto_G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) {

    43   oop obj = oopDesc::load_decode_heap_oop(p);

    44 #ifdef ASSERT

    45   // can't do because of races

    46   // assert(obj == NULL || obj->is_oop(), "expected an oop");

    48   // Do the safe subset of is_oop

    49   if (obj != NULL) {

    50 #ifdef CHECK_UNHANDLED_OOPS

    51     oopDesc* o = obj.obj();

    52 #else

    53     oopDesc* o = obj;

    54 #endif // CHECK_UNHANDLED_OOPS

    55     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

    56     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

    57   }

    58 #endif // ASSERT

    60   assert(from == NULL || from->is_in_reserved(p), "p is not in from");

    62   HeapRegion* to = _g1->heap_region_containing(obj);

    63   // The test below could be optimized by applying a bit op to to and from.

    64   if (to != NULL && from != NULL && from != to) {

    65     // The _traversal_in_progress flag is true during the collection pause,

    66     // false during the evacuation failure handling. This should avoid a

    67     // potential loop if we were to add the card containing 'p' to the DCQS

    68     // that's used to regenerate the remembered sets for the collection set,

    69     // in the event of an evacuation failure, here. The UpdateRSImmediate

    70     // closure will eventally call this routine.

    71     if (_traversal_in_progress &&

    72         to->in_collection_set() && !self_forwarded(obj)) {

    74       assert(_cset_rs_update_cl[tid] != NULL, "should have been set already");

    75       _cset_rs_update_cl[tid]->do_oop(p);

    77       // Deferred updates to the CSet are either discarded (in the normal case),

    78       // or processed (if an evacuation failure occurs) at the end

    79       // of the collection.

    80       // See HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do().

    81     } else {

    82 #if G1_REM_SET_LOGGING

    83       gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"

    84                              " for region [" PTR_FORMAT ", " PTR_FORMAT ")",

    85                              p, obj,

    86                              to->bottom(), to->end());

    87 #endif

    88       assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");

    89       to->rem_set()->add_reference(p, tid);

    90     }

    91   }

    92 }

    94 template <class T> inline void UpdateRSOopClosure::do_oop_work(T* p) {

    95   assert(_from != NULL, "from region must be non-NULL");

    96   _rs->par_write_ref(_from, p, _worker_i);

    97 }

    99 template <class T> inline void UpdateRSetImmediate::do_oop_work(T* p) {

   100   assert(_from->is_in_reserved(p), "paranoia");

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

   102   if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {

   103     _g1_rem_set->par_write_ref(_from, p, 0);

   104   }

   105 }

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