1/*
2 * Copyright (c) 2001, 2019, 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_GC_SERIAL_TENUREDGENERATION_HPP
26#define SHARE_GC_SERIAL_TENUREDGENERATION_HPP
27
28#include "gc/serial/cSpaceCounters.hpp"
29#include "gc/shared/cardGeneration.hpp"
30#include "gc/shared/gcStats.hpp"
31#include "gc/shared/generationCounters.hpp"
32#include "utilities/macros.hpp"
33
34// TenuredGeneration models the heap containing old (promoted/tenured) objects
35// contained in a single contiguous space.
36//
37// Garbage collection is performed using mark-compact.
38
39class TenuredGeneration: public CardGeneration {
40 friend class VMStructs;
41 // Abstractly, this is a subtype that gets access to protected fields.
42 friend class VM_PopulateDumpSharedSpace;
43
44 protected:
45 ContiguousSpace* _the_space; // Actual space holding objects
46
47 GenerationCounters* _gen_counters;
48 CSpaceCounters* _space_counters;
49
50 // Allocation failure
51 virtual bool expand(size_t bytes, size_t expand_bytes);
52
53 // Accessing spaces
54 ContiguousSpace* space() const { return _the_space; }
55
56 void assert_correct_size_change_locking();
57
58 public:
59 TenuredGeneration(ReservedSpace rs,
60 size_t initial_byte_size,
61 size_t min_byte_size,
62 size_t max_byte_size,
63 CardTableRS* remset);
64
65 Generation::Name kind() { return Generation::MarkSweepCompact; }
66
67 // Printing
68 const char* name() const { return "tenured generation"; }
69 const char* short_name() const { return "Tenured"; }
70
71 size_t unsafe_max_alloc_nogc() const;
72 size_t contiguous_available() const;
73
74 // Iteration
75 void object_iterate(ObjectClosure* blk);
76
77 virtual inline HeapWord* allocate(size_t word_size, bool is_tlab);
78 virtual inline HeapWord* par_allocate(size_t word_size, bool is_tlab);
79
80 template <typename OopClosureType>
81 void oop_since_save_marks_iterate(OopClosureType* cl);
82
83 void save_marks();
84 void reset_saved_marks();
85 bool no_allocs_since_save_marks();
86
87 inline size_t block_size(const HeapWord* addr) const;
88
89 inline bool block_is_obj(const HeapWord* addr) const;
90
91 virtual void collect(bool full,
92 bool clear_all_soft_refs,
93 size_t size,
94 bool is_tlab);
95
96 HeapWord* expand_and_allocate(size_t size,
97 bool is_tlab,
98 bool parallel = false);
99
100 virtual void prepare_for_verify();
101
102 virtual void gc_prologue(bool full);
103 virtual void gc_epilogue(bool full);
104
105 bool should_collect(bool full,
106 size_t word_size,
107 bool is_tlab);
108
109 virtual void compute_new_size();
110
111 // Performance Counter support
112 void update_counters();
113
114 virtual void record_spaces_top();
115
116 // Statistics
117
118 virtual void update_gc_stats(Generation* current_generation, bool full);
119
120 virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
121
122 virtual void verify();
123 virtual void print_on(outputStream* st) const;
124};
125
126#endif // SHARE_GC_SERIAL_TENUREDGENERATION_HPP
127