1 /*
2 * Copyright (c) 2015, 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_G1_G1SCAVENGECLOSURES_HPP
26 #define SHARE_VM_GC_G1_G1SCAVENGECLOSURES_HPP
27
28 #include "gc/g1/bufferingOopClosure.hpp"
29 #include "gc/g1/g1CodeBlobClosure.hpp"
30 #include "gc/g1/g1OopClosures.hpp"
31 #include "gc/g1/g1RootClosures.hpp"
32
33 class G1CollectedHeap;
34 class G1ParScanThreadState;
35
36 // Simple holder object for a complete set of closures used by the G1 evacuation code.
37 template <G1Mark Mark>
38 class G1SharedClosures VALUE_OBJ_CLASS_SPEC {
39 public:
40 G1ParCopyClosure<G1BarrierNone, Mark> _oops;
41 G1ParCopyClosure<G1BarrierKlass, Mark> _oop_in_klass;
42 G1KlassScanClosure _klass_in_cld_closure;
43 CLDToKlassAndOopClosure _clds;
44 G1CodeBlobClosure _codeblobs;
45 BufferingOopClosure _buffered_oops;
46
47 G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty_klasses, bool must_claim_cld) :
48 _oops(g1h, pss),
49 _oop_in_klass(g1h, pss),
50 _klass_in_cld_closure(&_oop_in_klass, process_only_dirty_klasses),
51 _clds(&_klass_in_cld_closure, &_oops, must_claim_cld),
52 _codeblobs(&_oops),
53 _buffered_oops(&_oops) {}
54 };
55
56 class G1EvacuationClosures : public G1EvacuationRootClosures {
57 G1SharedClosures<G1MarkNone> _closures;
58
59 public:
60 G1EvacuationClosures(G1CollectedHeap* g1h,
61 G1ParScanThreadState* pss,
62 bool gcs_are_young) :
63 _closures(g1h, pss, gcs_are_young, /* must_claim_cld */ false) {}
64
65 OopClosure* weak_oops() { return &_closures._buffered_oops; }
66 OopClosure* strong_oops() { return &_closures._buffered_oops; }
67
68 CLDClosure* weak_clds() { return &_closures._clds; }
69 CLDClosure* strong_clds() { return &_closures._clds; }
70 CLDClosure* thread_root_clds() { return NULL; }
71 CLDClosure* second_pass_weak_clds() { return NULL; }
72
73 CodeBlobClosure* strong_codeblobs() { return &_closures._codeblobs; }
74 CodeBlobClosure* weak_codeblobs() { return &_closures._codeblobs; }
75 CodeBlobClosure* thread_root_codeblobs() { return &_closures._codeblobs; }
76
77 void flush() { _closures._buffered_oops.done(); }
78 double closure_app_seconds() { return _closures._buffered_oops.closure_app_seconds(); }
79
80 virtual OopClosure* raw_weak_oops() { return &_closures._oops; }
81 virtual OopClosure* raw_strong_oops() { return &_closures._oops; }
82 };
83
84 // Closures used during initial mark.
85 // The treatment of "weak" roots is selectable through the template parameter,
86 // this is usually used to control unloading of classes and interned strings.
87 template <G1Mark MarkWeak>
88 class G1InitalMarkClosures : public G1EvacuationRootClosures {
89 G1SharedClosures<G1MarkFromRoot> _strong;
90 G1SharedClosures<MarkWeak> _weak;
91
92 // Filter method to help with returning the appropriate closures
93 // depending on the class template parameter.
94 template <G1Mark Mark, typename T>
95 T* null_if(T* t) {
96 if (Mark == MarkWeak) {
97 return NULL;
98 }
99 return t;
100 }
101
102 public:
103 G1InitalMarkClosures(G1CollectedHeap* g1h,
104 G1ParScanThreadState* pss) :
105 _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true),
106 _weak(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true) {}
107
108 OopClosure* weak_oops() { return &_weak._buffered_oops; }
109 OopClosure* strong_oops() { return &_strong._buffered_oops; }
110
111 // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass.
112 CLDClosure* weak_clds() { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); }
113 CLDClosure* strong_clds() { return &_strong._clds; }
114
115 // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants
116 // return a NULL closure for the following specialized versions in that case.
117 CLDClosure* thread_root_clds() { return null_if<G1MarkFromRoot>(&_strong._clds); }
118 CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); }
119
120 CodeBlobClosure* strong_codeblobs() { return &_strong._codeblobs; }
121 CodeBlobClosure* weak_codeblobs() { return &_weak._codeblobs; }
122 CodeBlobClosure* thread_root_codeblobs() { return &_strong._codeblobs; }
123
124 void flush() {
125 _strong._buffered_oops.done();
126 _weak._buffered_oops.done();
127 }
128
129 double closure_app_seconds() {
130 return _strong._buffered_oops.closure_app_seconds() +
131 _weak._buffered_oops.closure_app_seconds();
132 }
133
134 virtual OopClosure* raw_weak_oops() { return &_weak._oops; }
135 virtual OopClosure* raw_strong_oops() { return &_strong._oops; }
136 };
137
138 #endif // SHARE_VM_GC_G1_G1SCAVENGECLOSURES_HPP