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comparison src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 14518:d8041d695d19

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Merged with jdk9/dev/hotspot changeset 3812c088b945
author twisti
date Tue, 11 Mar 2014 18:45:59 -0700
parents 97300b6165f8
children 4ca6dc0799b6 bc22cbb8b45a
comparison
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14141:f97c5ec83832 14518:d8041d695d19
1 /* 1 /*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
36 class CMTask; 36 class CMTask;
37 class ReferenceProcessor; 37 class ReferenceProcessor;
38 38
39 // A class that scans oops in a given heap region (much as OopsInGenClosure 39 // A class that scans oops in a given heap region (much as OopsInGenClosure
40 // scans oops in a generation.) 40 // scans oops in a generation.)
41 class OopsInHeapRegionClosure: public OopsInGenClosure { 41 class OopsInHeapRegionClosure: public ExtendedOopClosure {
42 protected: 42 protected:
43 HeapRegion* _from; 43 HeapRegion* _from;
44 public: 44 public:
45 void set_region(HeapRegion* from) { _from = from; } 45 void set_region(HeapRegion* from) { _from = from; }
46 }; 46 };
47 47
48 class G1ParClosureSuper : public OopsInHeapRegionClosure { 48 class G1ParClosureSuper : public OopsInHeapRegionClosure {
49 protected: 49 protected:
50 G1CollectedHeap* _g1; 50 G1CollectedHeap* _g1;
51 G1RemSet* _g1_rem;
52 ConcurrentMark* _cm;
53 G1ParScanThreadState* _par_scan_state; 51 G1ParScanThreadState* _par_scan_state;
54 uint _worker_id; 52 uint _worker_id;
55 bool _during_initial_mark;
56 bool _mark_in_progress;
57 public: 53 public:
58 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
59 bool apply_to_weak_ref_discovered_field() { return true; } 55 bool apply_to_weak_ref_discovered_field() { return true; }
60 }; 56 };
61 57
84 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
85 }; 81 };
86 82
87 #define G1_PARTIAL_ARRAY_MASK 0x2 83 #define G1_PARTIAL_ARRAY_MASK 0x2
88 84
89 template <class T> inline bool has_partial_array_mask(T* ref) { 85 inline bool has_partial_array_mask(oop* ref) {
90 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; 86 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
91 } 87 }
92 88
93 template <class T> inline T* set_partial_array_mask(T obj) { 89 // We never encode partial array oops as narrowOop*, so return false immediately.
90 // This allows the compiler to create optimized code when popping references from
91 // the work queue.
92 inline bool has_partial_array_mask(narrowOop* ref) {
93 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
94 return false;
95 }
96
97 // Only implement set_partial_array_mask() for regular oops, not for narrowOops.
98 // We always encode partial arrays as regular oop, to allow the
99 // specialization for has_partial_array_mask() for narrowOops above.
100 // This means that unintentional use of this method with narrowOops are caught
101 // by the compiler.
102 inline oop* set_partial_array_mask(oop obj) {
94 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); 103 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
95 return (T*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); 104 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
96 } 105 }
97 106
98 template <class T> inline oop clear_partial_array_mask(T* ref) { 107 template <class T> inline oop clear_partial_array_mask(T* ref) {
99 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); 108 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
100 } 109 }
118 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 127 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
119 }; 128 };
120 129
121 // Add back base class for metadata 130 // Add back base class for metadata
122 class G1ParCopyHelper : public G1ParClosureSuper { 131 class G1ParCopyHelper : public G1ParClosureSuper {
132 protected:
123 Klass* _scanned_klass; 133 Klass* _scanned_klass;
124 134 ConcurrentMark* _cm;
125 public: 135
126 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
127 _scanned_klass(NULL),
128 G1ParClosureSuper(g1, par_scan_state) {}
129
130 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
131 template <class T> void do_klass_barrier(T* p, oop new_obj);
132 };
133
134 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object>
135 class G1ParCopyClosure : public G1ParCopyHelper {
136 G1ParScanClosure _scanner;
137 template <class T> void do_oop_work(T* p);
138
139 protected:
140 // Mark the object if it's not already marked. This is used to mark 136 // Mark the object if it's not already marked. This is used to mark
141 // objects pointed to by roots that are guaranteed not to move 137 // objects pointed to by roots that are guaranteed not to move
142 // during the GC (i.e., non-CSet objects). It is MT-safe. 138 // during the GC (i.e., non-CSet objects). It is MT-safe.
143 void mark_object(oop obj); 139 void mark_object(oop obj);
144 140
145 // Mark the object if it's not already marked. This is used to mark 141 // Mark the object if it's not already marked. This is used to mark
146 // objects pointed to by roots that have been forwarded during a 142 // objects pointed to by roots that have been forwarded during a
147 // GC. It is MT-safe. 143 // GC. It is MT-safe.
148 void mark_forwarded_object(oop from_obj, oop to_obj); 144 void mark_forwarded_object(oop from_obj, oop to_obj);
149 145 public:
150 oop copy_to_survivor_space(oop obj); 146 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
147
148 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
149 template <class T> void do_klass_barrier(T* p, oop new_obj);
150 };
151
152 template <G1Barrier barrier, bool do_mark_object>
153 class G1ParCopyClosure : public G1ParCopyHelper {
154 private:
155 template <class T> void do_oop_work(T* p);
151 156
152 public: 157 public:
153 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 158 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
154 ReferenceProcessor* rp) : 159 ReferenceProcessor* rp) :
155 _scanner(g1, par_scan_state, rp),
156 G1ParCopyHelper(g1, par_scan_state) { 160 G1ParCopyHelper(g1, par_scan_state) {
157 assert(_ref_processor == NULL, "sanity"); 161 assert(_ref_processor == NULL, "sanity");
158 } 162 }
159 163
160 G1ParScanClosure* scanner() { return &_scanner; } 164 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
161
162 template <class T> void do_oop_nv(T* p) {
163 do_oop_work(p);
164 }
165 virtual void do_oop(oop* p) { do_oop_nv(p); } 165 virtual void do_oop(oop* p) { do_oop_nv(p); }
166 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 166 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
167 }; 167 };
168 168
169 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure; 169 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure;
170 typedef G1ParCopyClosure<false, G1BarrierKlass, false> G1ParScanMetadataClosure; 170 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure;
171 171
172 172
173 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; 173 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
174 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkClosure; 174 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
175 typedef G1ParCopyClosure<false, G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
176
177 // The following closure types are no longer used but are retained
178 // for historical reasons:
179 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
180 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
181 175
182 // The following closure type is defined in g1_specialized_oop_closures.hpp: 176 // The following closure type is defined in g1_specialized_oop_closures.hpp:
183 // 177 //
184 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure; 178 // typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacClosure;
185 179
186 // We use a separate closure to handle references during evacuation 180 // We use a separate closure to handle references during evacuation
187 // failure processing. 181 // failure processing.
188 // We could have used another instance of G1ParScanHeapEvacClosure 182 // We could have used another instance of G1ParScanHeapEvacClosure
189 // (since that closure no longer assumes that the references it 183 // (since that closure no longer assumes that the references it
190 // handles point into the collection set). 184 // handles point into the collection set).
191 185
192 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; 186 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
193 187
194 class FilterIntoCSClosure: public ExtendedOopClosure { 188 class FilterIntoCSClosure: public ExtendedOopClosure {
195 G1CollectedHeap* _g1; 189 G1CollectedHeap* _g1;
196 OopClosure* _oc; 190 OopClosure* _oc;
197 DirtyCardToOopClosure* _dcto_cl; 191 DirtyCardToOopClosure* _dcto_cl;