1 /*
2 * Copyright (c) 2001, 2011, 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_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
27
28 class HeapRegion;
29 class G1CollectedHeap;
30 class G1RemSet;
31 class ConcurrentMark;
32 class DirtyCardToOopClosure;
33 class CMBitMap;
34 class CMMarkStack;
35 class G1ParScanThreadState;
36 class CMTask;
37
38 // A class that scans oops in a given heap region (much as OopsInGenClosure
39 // scans oops in a generation.)
40 class OopsInHeapRegionClosure: public OopsInGenClosure {
41 protected:
42 HeapRegion* _from;
43 public:
44 void set_region(HeapRegion* from) { _from = from; }
45 };
46
47 class G1ParClosureSuper : public OopsInHeapRegionClosure {
48 protected:
49 G1CollectedHeap* _g1;
50 G1RemSet* _g1_rem;
51 ConcurrentMark* _cm;
52 G1ParScanThreadState* _par_scan_state;
53 bool _during_initial_mark;
54 bool _mark_in_progress;
55 public:
56 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
57 bool apply_to_weak_ref_discovered_field() { return true; }
58 };
59
60 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
61 public:
62 G1ParPushHeapRSClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
63 G1ParClosureSuper(g1, par_scan_state) { }
64 template <class T> void do_oop_nv(T* p);
65 virtual void do_oop(oop* p) { do_oop_nv(p); }
66 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
67 };
68
69 class G1ParScanClosure : public G1ParClosureSuper {
70 public:
71 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
72 G1ParClosureSuper(g1, par_scan_state) { }
73 template <class T> void do_oop_nv(T* p);
74 virtual void do_oop(oop* p) { do_oop_nv(p); }
75 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
76 };
77
78 #define G1_PARTIAL_ARRAY_MASK 0x2
79
80 template <class T> inline bool has_partial_array_mask(T* ref) {
81 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
82 }
83
84 template <class T> inline T* set_partial_array_mask(T obj) {
85 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
86 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
87 }
88
89 template <class T> inline oop clear_partial_array_mask(T* ref) {
90 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
91 }
92
93 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
94 G1ParScanClosure _scanner;
95 public:
96 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
97 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { }
98 template <class T> void do_oop_nv(T* p);
99 virtual void do_oop(oop* p) { do_oop_nv(p); }
100 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
101 };
102
103
104 class G1ParCopyHelper : public G1ParClosureSuper {
105 G1ParScanClosure *_scanner;
106 protected:
107 template <class T> void mark_object(T* p);
108 oop copy_to_survivor_space(oop obj, bool should_mark_copy);
109 public:
110 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
111 G1ParScanClosure *scanner) :
112 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
113 };
114
115 template<bool do_gen_barrier, G1Barrier barrier,
116 bool do_mark_object>
117 class G1ParCopyClosure : public G1ParCopyHelper {
118 G1ParScanClosure _scanner;
119 template <class T> void do_oop_work(T* p);
120 public:
121 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
122 _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
123 template <class T> void do_oop_nv(T* p) {
124 do_oop_work(p);
125 }
126 virtual void do_oop(oop* p) { do_oop_nv(p); }
127 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
128 };
129
130 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
131 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
132 typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
133 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
134 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
135 typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
136
137 // This is the only case when we set skip_cset_test. Basically, this
138 // closure is (should?) only be called directly while we're draining
139 // the overflow and task queues. In that case we know that the
140 // reference in question points into the collection set, otherwise we
141 // would not have pushed it on the queue. The following is defined in
142 // g1_specialized_oop_closures.hpp.
143 // typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
144 // We need a separate closure to handle references during evacuation
145 // failure processing, as we cannot asume that the reference already
146 // points into the collection set (like G1ParScanHeapEvacClosure does).
147 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
148
149 class FilterIntoCSClosure: public OopClosure {
150 G1CollectedHeap* _g1;
151 OopClosure* _oc;
152 DirtyCardToOopClosure* _dcto_cl;
153 public:
154 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
155 G1CollectedHeap* g1, OopClosure* oc) :
156 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
157 {}
158 template <class T> void do_oop_nv(T* p);
159 virtual void do_oop(oop* p) { do_oop_nv(p); }
160 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
161 bool apply_to_weak_ref_discovered_field() { return true; }
162 bool do_header() { return false; }
163 };
164
165 class FilterOutOfRegionClosure: public OopClosure {
166 HeapWord* _r_bottom;
167 HeapWord* _r_end;
168 OopClosure* _oc;
169 int _out_of_region;
170 public:
171 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
172 template <class T> void do_oop_nv(T* p);
173 virtual void do_oop(oop* p) { do_oop_nv(p); }
174 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
175 bool apply_to_weak_ref_discovered_field() { return true; }
176 bool do_header() { return false; }
177 int out_of_region() { return _out_of_region; }
178 };
179
180 // Closure for iterating over object fields during concurrent marking
181 class G1CMOopClosure : public OopClosure {
182 G1CollectedHeap* _g1h;
183 ConcurrentMark* _cm;
184 CMTask* _task;
185 public:
186 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
187 template <class T> void do_oop_nv(T* p);
188 virtual void do_oop( oop* p) { do_oop_nv(p); }
189 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
190 };
191
192 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP