21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SERIAL_MARKSWEEP_HPP
26 #define SHARE_GC_SERIAL_MARKSWEEP_HPP
27
28 #include "gc/shared/collectedHeap.hpp"
29 #include "gc/shared/genOopClosures.hpp"
30 #include "gc/shared/taskqueue.hpp"
31 #include "memory/iterator.hpp"
32 #include "oops/markWord.hpp"
33 #include "oops/oop.hpp"
34 #include "runtime/timer.hpp"
35 #include "utilities/growableArray.hpp"
36 #include "utilities/stack.hpp"
37
38 class ReferenceProcessor;
39 class DataLayout;
40 class SerialOldTracer;
41 class STWGCTimer;
42
43 // MarkSweep takes care of global mark-compact garbage collection for a
44 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All
45 // generations are assumed to support marking; those that can also support
46 // compaction.
47 //
48 // Class unloading will only occur when a full gc is invoked.
49
50 // declared at end
51 class PreservedMark;
52 class MarkAndPushClosure;
53 class AdjustPointerClosure;
54
55 class MarkSweep : AllStatic {
56 //
57 // Inline closure decls
58 //
59 class FollowRootClosure: public BasicOopIterateClosure {
60 public:
107 static PreservedMark* _preserved_marks;
108
109 // Reference processing (used in ...follow_contents)
110 static ReferenceProcessor* _ref_processor;
111
112 static STWGCTimer* _gc_timer;
113 static SerialOldTracer* _gc_tracer;
114
115 // Non public closures
116 static KeepAliveClosure keep_alive;
117
118 public:
119 static void initialize();
120
121 // Public closures
122 static IsAliveClosure is_alive;
123 static FollowRootClosure follow_root_closure;
124 static MarkAndPushClosure mark_and_push_closure;
125 static FollowStackClosure follow_stack_closure;
126 static CLDToOopClosure follow_cld_closure;
127 static AdjustPointerClosure adjust_pointer_closure;
128 static CLDToOopClosure adjust_cld_closure;
129
130 // Accessors
131 static uint total_invocations() { return _total_invocations; }
132
133 // Reference Processing
134 static ReferenceProcessor* const ref_processor() { return _ref_processor; }
135 static void set_ref_processor(ReferenceProcessor* rp);
136
137 static STWGCTimer* gc_timer() { return _gc_timer; }
138 static SerialOldTracer* gc_tracer() { return _gc_tracer; }
139
140 static void preserve_mark(oop p, markWord mark);
141 // Save the mark word so it can be restored later
142 static void adjust_marks(); // Adjust the pointers in the preserved marks table
143 static void restore_marks(); // Restore the marks that we saved in preserve_mark
144
145 static int adjust_pointers(oop obj);
146
147 static void follow_stack(); // Empty marking stack.
148
149 static void follow_klass(Klass* klass);
150
151 static void follow_cld(ClassLoaderData* cld);
152
153 template <class T> static inline void adjust_pointer(T* p);
154
155 // Check mark and maybe push on marking stack
156 template <class T> static void mark_and_push(T* p);
157
158 private:
159 // Call backs for marking
160 static void mark_object(oop obj);
161 // Mark pointer and follow contents. Empty marking stack afterwards.
162 template <class T> static inline void follow_root(T* p);
163
164 static inline void push_objarray(oop obj, size_t index);
165
166 static void follow_object(oop obj);
167
168 static void follow_array(objArrayOop array);
169
170 static void follow_array_chunk(objArrayOop array, int index);
171 };
172
173 class MarkAndPushClosure: public OopIterateClosure {
174 public:
175 template <typename T> void do_oop_work(T* p);
176 virtual void do_oop(oop* p);
177 virtual void do_oop(narrowOop* p);
178
179 virtual bool do_metadata() { return true; }
180 virtual void do_klass(Klass* k);
181 virtual void do_cld(ClassLoaderData* cld);
182
183 void set_ref_discoverer(ReferenceDiscoverer* rd) {
184 set_ref_discoverer_internal(rd);
185 }
186 };
187
188 class AdjustPointerClosure: public BasicOopIterateClosure {
189 public:
190 template <typename T> void do_oop_work(T* p);
191 virtual void do_oop(oop* p);
192 virtual void do_oop(narrowOop* p);
193 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
194 };
195
196 class PreservedMark {
197 private:
198 oop _obj;
199 markWord _mark;
200
201 public:
202 void init(oop obj, markWord mark) {
203 _obj = obj;
204 _mark = mark;
205 }
206
207 void adjust_pointer();
208 void restore();
209 };
210
211 #endif // SHARE_GC_SERIAL_MARKSWEEP_HPP
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21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SERIAL_MARKSWEEP_HPP
26 #define SHARE_GC_SERIAL_MARKSWEEP_HPP
27
28 #include "gc/shared/collectedHeap.hpp"
29 #include "gc/shared/genOopClosures.hpp"
30 #include "gc/shared/taskqueue.hpp"
31 #include "memory/iterator.hpp"
32 #include "oops/markWord.hpp"
33 #include "oops/oop.hpp"
34 #include "runtime/timer.hpp"
35 #include "utilities/growableArray.hpp"
36 #include "utilities/stack.hpp"
37
38 class ReferenceProcessor;
39 class DataLayout;
40 class SerialOldTracer;
41 class SlidingForwarding;
42 class STWGCTimer;
43
44 // MarkSweep takes care of global mark-compact garbage collection for a
45 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All
46 // generations are assumed to support marking; those that can also support
47 // compaction.
48 //
49 // Class unloading will only occur when a full gc is invoked.
50
51 // declared at end
52 class PreservedMark;
53 class MarkAndPushClosure;
54 class AdjustPointerClosure;
55
56 class MarkSweep : AllStatic {
57 //
58 // Inline closure decls
59 //
60 class FollowRootClosure: public BasicOopIterateClosure {
61 public:
108 static PreservedMark* _preserved_marks;
109
110 // Reference processing (used in ...follow_contents)
111 static ReferenceProcessor* _ref_processor;
112
113 static STWGCTimer* _gc_timer;
114 static SerialOldTracer* _gc_tracer;
115
116 // Non public closures
117 static KeepAliveClosure keep_alive;
118
119 public:
120 static void initialize();
121
122 // Public closures
123 static IsAliveClosure is_alive;
124 static FollowRootClosure follow_root_closure;
125 static MarkAndPushClosure mark_and_push_closure;
126 static FollowStackClosure follow_stack_closure;
127 static CLDToOopClosure follow_cld_closure;
128
129 // Accessors
130 static uint total_invocations() { return _total_invocations; }
131
132 // Reference Processing
133 static ReferenceProcessor* const ref_processor() { return _ref_processor; }
134 static void set_ref_processor(ReferenceProcessor* rp);
135
136 static STWGCTimer* gc_timer() { return _gc_timer; }
137 static SerialOldTracer* gc_tracer() { return _gc_tracer; }
138
139 static void preserve_mark(oop p, markWord mark);
140 // Save the mark word so it can be restored later
141 static void adjust_marks(); // Adjust the pointers in the preserved marks table
142 static void restore_marks(); // Restore the marks that we saved in preserve_mark
143
144 static int adjust_pointers(const SlidingForwarding* const forwarding, oop obj);
145
146 static void follow_stack(); // Empty marking stack.
147
148 static void follow_klass(Klass* klass);
149
150 static void follow_cld(ClassLoaderData* cld);
151
152 template <class T> static inline void adjust_pointer(const SlidingForwarding* const forwarding, T* p);
153
154 // Check mark and maybe push on marking stack
155 template <class T> static void mark_and_push(T* p);
156
157 private:
158 // Call backs for marking
159 static void mark_object(oop obj);
160 // Mark pointer and follow contents. Empty marking stack afterwards.
161 template <class T> static inline void follow_root(T* p);
162
163 static inline void push_objarray(oop obj, size_t index);
164
165 static void follow_object(oop obj);
166
167 static void follow_array(objArrayOop array);
168
169 static void follow_array_chunk(objArrayOop array, int index);
170 };
171
172 class MarkAndPushClosure: public OopIterateClosure {
173 public:
174 template <typename T> void do_oop_work(T* p);
175 virtual void do_oop(oop* p);
176 virtual void do_oop(narrowOop* p);
177
178 virtual bool do_metadata() { return true; }
179 virtual void do_klass(Klass* k);
180 virtual void do_cld(ClassLoaderData* cld);
181
182 void set_ref_discoverer(ReferenceDiscoverer* rd) {
183 set_ref_discoverer_internal(rd);
184 }
185 };
186
187 class AdjustPointerClosure: public BasicOopIterateClosure {
188 private:
189 const SlidingForwarding* const _forwarding;
190 public:
191 AdjustPointerClosure(const SlidingForwarding* forwarding) : _forwarding(forwarding) {}
192 template <typename T> void do_oop_work(T* p);
193 virtual void do_oop(oop* p);
194 virtual void do_oop(narrowOop* p);
195 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
196 };
197
198 class PreservedMark {
199 private:
200 oop _obj;
201 markWord _mark;
202
203 public:
204 void init(oop obj, markWord mark) {
205 _obj = obj;
206 _mark = mark;
207 }
208
209 void adjust_pointer(const SlidingForwarding* const forwarding);
210 void restore();
211 };
212
213 #endif // SHARE_GC_SERIAL_MARKSWEEP_HPP
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