1 /*
   2  * Copyright (c) 2016, 2018 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_implementation/shenandoah/preservedMarks.hpp"
  29 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
  30 #include "oops/oop.inline.hpp"
  31 #include "utilities/stack.inline.hpp"
  32 
  33 inline bool PreservedMarks::should_preserve_mark(oop obj, markOop m) const {
  34   return m->must_be_preserved_for_promotion_failure(obj);
  35 }
  36 
  37 inline void PreservedMarks::push(oop obj, markOop m) {
  38   assert(should_preserve_mark(obj, m), "pre-condition");
  39   OopAndMarkOop elem(obj, m);
  40   _stack.push(elem);
  41 }
  42 
  43 inline void PreservedMarks::push_if_necessary(oop obj, markOop m) {
  44   if (should_preserve_mark(obj, m)) {
  45     push(obj, m);
  46   }
  47 }
  48 
  49 inline void PreservedMarks::init_forwarded_mark(oop obj) {
  50   obj->init_mark();
  51 }
  52 
  53 inline void PreservedMarksSet::restore(RestorePreservedMarksTaskExecutor* executor) {
  54   volatile size_t total_size = 0;
  55 
  56 #ifdef ASSERT
  57   // This is to make sure the total_size we'll calculate below is correct.
  58   size_t total_size_before = 0;
  59   for (uint i = 0; i < _num; i += 1) {
  60     total_size_before += get(i)->size();
  61   }
  62 #endif // def ASSERT
  63 
  64   executor->restore(this, &total_size);
  65   assert_empty();
  66 
  67   assert(total_size == total_size_before,
  68          err_msg("total_size = " SIZE_FORMAT " before = " SIZE_FORMAT,
  69                  total_size, total_size_before));
  70 
  71   log_trace(gc)("Restored " SIZE_FORMAT " marks", total_size);
  72 }
  73 
  74 inline PreservedMarks::PreservedMarks()
  75     : _stack(OopAndMarkOopStack::default_segment_size(),
  76              // This stack should be used very infrequently so there's
  77              // no point in caching stack segments (there will be a
  78              // waste of space most of the time). So we set the max
  79              // cache size to 0.
  80              0 /* max_cache_size */) { }
  81 
  82 void PreservedMarks::OopAndMarkOop::set_mark() const {
  83   _o->set_mark(_m);
  84 }
  85 
  86 #endif // SHARE_VM_GC_SHARED_PRESERVEDMARKS_INLINE_HPP