1 /*
2 * Copyright (c) 2017, 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_SHENANDOAHVERIFIER_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHVERIFIER_HPP
26
27 #include "gc_implementation/shared/markBitMap.hpp"
28 #include "oops/oopsHierarchy.hpp"
29 #include "memory/allocation.hpp"
30 #include "utilities/stack.hpp"
31
32 class ShenandoahHeap;
33
34 class ShenandoahVerifierTask {
35 public:
36 ShenandoahVerifierTask(oop o = NULL, int idx = 0): _obj(o) { }
37 ShenandoahVerifierTask(oop o, size_t idx): _obj(o) { }
38 ShenandoahVerifierTask(const ShenandoahVerifierTask& t): _obj(t._obj) { }
39
40 ShenandoahVerifierTask& operator =(const ShenandoahVerifierTask& t) {
41 _obj = t._obj;
42 return *this;
43 }
44 volatile ShenandoahVerifierTask&
45 operator =(const volatile ShenandoahVerifierTask& t) volatile {
46 (void)const_cast<oop&>(_obj = t._obj);
47 return *this;
48 }
49
50 inline oop obj() const { return _obj; }
51
52 private:
53 oop _obj;
54 };
55
56 typedef Stack<ShenandoahVerifierTask, mtGC> ShenandoahVerifierStack;
57 typedef volatile jint ShenandoahLivenessData;
58
59 class ShenandoahVerifier : public CHeapObj<mtGC> {
60 private:
61 ShenandoahHeap* _heap;
62 MarkBitMap* _verification_bit_map;
63 public:
64 typedef enum {
65 // Disable marked objects verification.
66 _verify_marked_disable,
67
68 // Objects should be marked in "next" bitmap.
69 _verify_marked_incomplete,
70
71 // Objects should be marked in "complete" bitmap.
72 _verify_marked_complete
73 } VerifyMarked;
74
75 typedef enum {
76 // Disable forwarded objects verification.
77 _verify_forwarded_disable,
78
79 // Objects should not have forwardees.
80 _verify_forwarded_none,
81
82 // Objects may have forwardees.
83 _verify_forwarded_allow
84 } VerifyForwarded;
85
86 typedef enum {
87 // Disable collection set verification.
88 _verify_cset_disable,
89
90 // Should have no references to cset.
91 _verify_cset_none,
92
93 // May have references to cset, all should be forwarded.
94 // Note: Allowing non-forwarded references to cset is equivalent
95 // to _verify_cset_disable.
96 _verify_cset_forwarded
97 } VerifyCollectionSet;
98
99 typedef enum {
100 // Disable liveness verification
101 _verify_liveness_disable,
102
103 // All objects should belong to live regions
104 _verify_liveness_conservative,
105
106 // All objects should belong to live regions,
107 // and liveness data should be accurate
108 _verify_liveness_complete
109 } VerifyLiveness;
110
111 typedef enum {
112 // Disable region verification
113 _verify_regions_disable,
114
115 // No trash regions allowed
116 _verify_regions_notrash,
117
118 // No collection set regions allowed
119 _verify_regions_nocset,
120
121 // No trash and no cset regions allowed
122 _verify_regions_notrash_nocset
123 } VerifyRegions;
124
125 typedef enum {
126 // Disable gc-state verification
127 _verify_gcstate_disable,
128
129 // Nothing is in progress, no forwarded objects
130 _verify_gcstate_stable,
131
132 // Nothing is in progress, some objects are forwarded
133 _verify_gcstate_forwarded,
134
135 // Evacuation is in progress, some objects are forwarded
136 _verify_gcstate_evacuation
137 } VerifyGCState;
138
139 struct VerifyOptions {
140 VerifyForwarded _verify_forwarded;
141 VerifyMarked _verify_marked;
142 VerifyCollectionSet _verify_cset;
143 VerifyLiveness _verify_liveness;
144 VerifyRegions _verify_regions;
145 VerifyGCState _verify_gcstate;
146
147 VerifyOptions(VerifyForwarded verify_forwarded,
148 VerifyMarked verify_marked,
149 VerifyCollectionSet verify_collection_set,
150 VerifyLiveness verify_liveness,
151 VerifyRegions verify_regions,
152 VerifyGCState verify_gcstate) :
153 _verify_forwarded(verify_forwarded), _verify_marked(verify_marked),
154 _verify_cset(verify_collection_set),
155 _verify_liveness(verify_liveness), _verify_regions(verify_regions),
156 _verify_gcstate(verify_gcstate) {}
157 };
158
159 private:
160 void verify_at_safepoint(const char *label,
161 VerifyForwarded forwarded,
162 VerifyMarked marked,
163 VerifyCollectionSet cset,
164 VerifyLiveness liveness,
165 VerifyRegions regions,
166 VerifyGCState gcstate);
167
168 public:
169 ShenandoahVerifier(ShenandoahHeap* heap, MarkBitMap* verification_bitmap) :
170 _heap(heap), _verification_bit_map(verification_bitmap) {};
171
172 void verify_before_concmark();
173 void verify_after_concmark();
174 void verify_before_evacuation();
175 void verify_during_evacuation();
176 void verify_after_evacuation();
177 void verify_before_updaterefs();
178 void verify_after_updaterefs();
179 void verify_before_fullgc();
180 void verify_after_fullgc();
181 void verify_before_traversal();
182 void verify_after_traversal();
183 void verify_after_degenerated();
184 void verify_generic(VerifyOption option);
185 };
186
187 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHVERIFIER_HPP