1 /*
2 * Copyright (c) 2018, 2021, Red Hat, 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 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_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
27
28 #include "gc/shenandoah/shenandoahMarkBitMap.hpp"
29 #include "gc/shenandoah/shenandoahSharedVariables.hpp"
30 #include "memory/allocation.hpp"
31 #include "memory/memRegion.hpp"
32 #include "oops/oopsHierarchy.hpp"
33
34 class ShenandoahObjToScanQueueSet;
35
36 /**
37 * Encapsulate a marking bitmap with the top-at-mark-start and top-bitmaps array.
38 */
39 class ShenandoahMarkingContext : public CHeapObj<mtGC> {
40 private:
41 // Marking bitmap
42 ShenandoahMarkBitMap _mark_bit_map;
43
44 HeapWord** const _top_bitmaps;
45 HeapWord** const _top_at_mark_starts_base;
46 HeapWord** const _top_at_mark_starts;
47
48 ShenandoahSharedFlag _is_complete;
49
50 // Marking task queues
51 ShenandoahObjToScanQueueSet* _task_queues;
52
53 public:
54 ShenandoahMarkingContext(MemRegion heap_region, MemRegion bitmap_region, size_t num_regions, uint max_queues);
55 ~ShenandoahMarkingContext();
56
57 /*
58 * Marks the object. Returns true if the object has not been marked before and has
59 * been marked by this thread. Returns false if the object has already been marked,
60 * or if a competing thread succeeded in marking this object.
61 */
62 inline bool mark_strong(oop obj, bool& was_upgraded);
63 inline bool mark_weak(oop obj);
64
65 // Simple versions of marking accessors, to be used outside of marking (e.g. no possible concurrent updates)
66 inline bool is_marked(oop) const;
67 inline bool is_marked_strong(oop obj) const;
68 inline bool is_marked_weak(oop obj) const;
69
70 inline HeapWord* get_next_marked_addr(HeapWord* addr, HeapWord* limit) const;
71
72 inline bool allocated_after_mark_start(oop obj) const;
73 inline bool allocated_after_mark_start(HeapWord* addr) const;
74
75 inline HeapWord* top_at_mark_start(ShenandoahHeapRegion* r) const;
76 inline void capture_top_at_mark_start(ShenandoahHeapRegion* r);
77 inline void reset_top_at_mark_start(ShenandoahHeapRegion* r);
78 void initialize_top_at_mark_start(ShenandoahHeapRegion* r);
79
80 inline void reset_top_bitmap(ShenandoahHeapRegion *r);
81 void clear_bitmap(ShenandoahHeapRegion *r);
82
83 bool is_bitmap_clear() const;
84 bool is_bitmap_clear_range(HeapWord* start, HeapWord* end) const;
85
86 bool is_complete();
87 void mark_complete();
88 void mark_incomplete();
89
90 // Task queues
91 ShenandoahObjToScanQueueSet* task_queues() const { return _task_queues; }
92 };
93
94 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
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1 /*
2 * Copyright (c) 2018, 2021, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
27 #define SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
28
29 #include "gc/shenandoah/shenandoahMarkBitMap.hpp"
30 #include "gc/shenandoah/shenandoahSharedVariables.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/memRegion.hpp"
33 #include "oops/oopsHierarchy.hpp"
34
35 class ShenandoahObjToScanQueueSet;
36 class ShenandoahHeapRegion;
37
38 /**
39 * Encapsulate a marking bitmap with the top-at-mark-start and top-bitmaps array.
40 */
41 class ShenandoahMarkingContext : public CHeapObj<mtGC> {
42 private:
43 // Marking bitmap
44 ShenandoahMarkBitMap _mark_bit_map;
45
46 HeapWord** const _top_bitmaps;
47 HeapWord** const _top_at_mark_starts_base;
48 HeapWord** const _top_at_mark_starts;
49
50 ShenandoahSharedFlag _is_complete;
51
52 public:
53 ShenandoahMarkingContext(MemRegion heap_region, MemRegion bitmap_region, size_t num_regions);
54
55 /*
56 * Marks the object. Returns true if the object has not been marked before and has
57 * been marked by this thread. Returns false if the object has already been marked,
58 * or if a competing thread succeeded in marking this object.
59 */
60 inline bool mark_strong(oop obj, bool& was_upgraded);
61 inline bool mark_weak(oop obj);
62
63 // Simple versions of marking accessors, to be used outside of marking (e.g. no possible concurrent updates)
64 // TODO: Do these really need to be const?
65 inline bool is_marked(const oop) const;
66 inline bool is_marked_strong(const oop obj) const;
67 inline bool is_marked_weak(const oop obj) const;
68 inline bool is_marked_or_old(const oop obj) const;
69 inline bool is_marked_strong_or_old(const oop obj) const;
70
71 inline HeapWord* get_next_marked_addr(const HeapWord* addr, const HeapWord* limit) const;
72
73 inline bool allocated_after_mark_start(const oop obj) const;
74 inline bool allocated_after_mark_start(const HeapWord* addr) const;
75
76 inline HeapWord* top_at_mark_start(const ShenandoahHeapRegion* r) const;
77 inline void capture_top_at_mark_start(ShenandoahHeapRegion* r);
78 inline void reset_top_at_mark_start(ShenandoahHeapRegion* r);
79 void initialize_top_at_mark_start(ShenandoahHeapRegion* r);
80
81 HeapWord* top_bitmap(ShenandoahHeapRegion* r);
82
83 inline void reset_top_bitmap(ShenandoahHeapRegion *r);
84 void clear_bitmap(ShenandoahHeapRegion *r);
85
86 bool is_bitmap_clear() const;
87 bool is_bitmap_clear_range(const HeapWord* start, const HeapWord* end) const;
88
89 bool is_complete();
90 void mark_complete();
91 void mark_incomplete();
92 };
93
94 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
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