1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_INLINE_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_INLINE_HPP
  26 
  27 #include "gc_implementation/shenandoah/shenandoahMarkingContext.hpp"
  28 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
  29 
  30 inline MarkBitMap* ShenandoahMarkingContext::mark_bit_map() {
  31   return &_mark_bit_map;
  32 }
  33 
  34 inline bool ShenandoahMarkingContext::mark(oop obj) {
  35   shenandoah_assert_not_forwarded(NULL, obj);
  36   HeapWord* addr = (HeapWord*) obj;
  37   return (! allocated_after_mark_start(addr)) && _mark_bit_map.parMark(addr);
  38 }
  39 
  40 inline bool ShenandoahMarkingContext::is_marked(oop obj) const {
  41   HeapWord* addr = (HeapWord*) obj;
  42   return allocated_after_mark_start(addr) || _mark_bit_map.isMarked(addr);
  43 }
  44 
  45 inline bool ShenandoahMarkingContext::allocated_after_mark_start(oop obj) const {
  46   HeapWord* addr = cast_from_oop<HeapWord*>(obj);
  47   return allocated_after_mark_start(addr);
  48 }
  49 
  50 inline bool ShenandoahMarkingContext::allocated_after_mark_start(HeapWord* addr) const {
  51   uintx index = ((uintx) addr) >> ShenandoahHeapRegion::region_size_bytes_shift();
  52   HeapWord* top_at_mark_start = _top_at_mark_starts[index];
  53   bool alloc_after_mark_start = addr >= top_at_mark_start;
  54   return alloc_after_mark_start;
  55 }
  56 
  57 void ShenandoahMarkingContext::capture_top_at_mark_start(ShenandoahHeapRegion *r) {
  58   size_t idx = r->index();
  59   HeapWord* old_tams = _top_at_mark_starts_base[idx];
  60   HeapWord* new_tams = r->top();
  61 
  62   assert(new_tams >= old_tams,
  63          err_msg("Region " SIZE_FORMAT", TAMS updates should be monotonic: " PTR_FORMAT " -> " PTR_FORMAT,
  64                  idx, p2i(old_tams), p2i(new_tams)));
  65   assert(is_bitmap_clear_range(old_tams, new_tams),
  66          err_msg("Region " SIZE_FORMAT ", bitmap should be clear while adjusting TAMS: " PTR_FORMAT " -> " PTR_FORMAT,
  67                  idx, p2i(old_tams), p2i(new_tams)));
  68 
  69   _top_at_mark_starts_base[idx] = new_tams;
  70   _top_bitmaps[idx] = new_tams;
  71 }
  72 
  73 void ShenandoahMarkingContext::reset_top_at_mark_start(ShenandoahHeapRegion* r) {
  74   _top_at_mark_starts_base[r->index()] = r->bottom();
  75 }
  76 
  77 HeapWord* ShenandoahMarkingContext::top_at_mark_start(ShenandoahHeapRegion* r) const {
  78   return _top_at_mark_starts_base[r->index()];
  79 }
  80 
  81 void ShenandoahMarkingContext::reset_top_bitmap(ShenandoahHeapRegion* r) {
  82   assert(is_bitmap_clear_range(r->bottom(), r->end()),
  83          err_msg("Region " SIZE_FORMAT " should have no marks in bitmap", r->index()));
  84   _top_bitmaps[r->index()] = r->bottom();
  85 }
  86 
  87 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_INLINE_HPP