1 /*

     2  * Copyright (c) 2016, 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  */

    24 

    25 #ifndef SHARE_VM_GC_SHARED_PRESERVEDMARKS_INLINE_HPP

    26 #define SHARE_VM_GC_SHARED_PRESERVEDMARKS_INLINE_HPP

    27 

    28 #include "gc/shared/preservedMarks.hpp"

    29 #include "oops/oop.inline.hpp"

    30 #include "utilities/stack.inline.hpp"

    31 

    32 inline bool PreservedMarks::should_preserve_mark(oop obj, markOop m) const {

    33   return m->must_be_preserved_for_promotion_failure(obj);

    34 }

    35 

    36 inline void PreservedMarks::push(oop obj, markOop m) {

    37   assert(should_preserve_mark(obj, m), "pre-condition");

    38   OopAndMarkOop elem(obj, m);

    39   _stack.push(elem);

    40 }

    41 

    42 inline void PreservedMarks::push_if_necessary(oop obj, markOop m) {

    43   if (should_preserve_mark(obj, m)) {

    44     push(obj, m);

    45   }

    46 }

    47 

    48 inline void PreservedMarks::init_forwarded_mark(oop obj) {

    49   obj->init_mark();

    50 }

    51 

    52 inline void PreservedMarksSet::restore(RestorePreservedMarksTaskExecutor* executor) {

    53   volatile size_t total_size = 0;

    54 

    55 #ifdef ASSERT

    56   // This is to make sure the total_size we'll calculate below is correct.

    57   size_t total_size_before = 0;

    58   for (uint i = 0; i < _num; i += 1) {

    59     total_size_before += get(i)->size();

    60   }

    61 #endif // def ASSERT

    62 

    63   executor->restore(this, &total_size);

    64   assert_empty();

    65 

    66   assert(total_size == total_size_before,

    67          "total_size = " SIZE_FORMAT " before = " SIZE_FORMAT,

    68          total_size, total_size_before);

    69 

    70   log_trace(gc)("Restored " SIZE_FORMAT " marks", total_size);

    71 }

    72 

    73 inline PreservedMarks::PreservedMarks()

    74     : _stack(OopAndMarkOopStack::default_segment_size(),

    75              // This stack should be used very infrequently so there's

    76              // no point in caching stack segments (there will be a

    77              // waste of space most of the time). So we set the max

    78              // cache size to 0.

    79              0 /* max_cache_size */) { }

    80 

    81 #endif // SHARE_VM_GC_SHARED_PRESERVEDMARKS_INLINE_HPP