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_SATBMARKQUEUE_HPP
26 #define SHARE_VM_GC_G1_SATBMARKQUEUE_HPP
27
28 #include "gc/g1/ptrQueue.hpp"
29 #include "memory/allocation.hpp"
30
31 class JavaThread;
32 class SATBMarkQueueSet;
33
34 // Base class for processing the contents of a SATB buffer.
35 class SATBBufferClosure : public StackObj {
36 protected:
37 ~SATBBufferClosure() { }
38
39 public:
40 // Process the SATB entries in the designated buffer range.
41 virtual void do_buffer(void** buffer, size_t size) = 0;
42 };
43
44 // A PtrQueue whose elements are (possibly stale) pointers to object heads.
45 class SATBMarkQueue: public PtrQueue {
46 friend class SATBMarkQueueSet;
47
48 private:
49 // Filter out unwanted entries from the buffer.
50 void filter();
51
52 public:
53 SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent = false);
54
55 // Process queue entries and free resources.
56 void flush();
57
58 // Apply cl to the active part of the buffer.
59 // Prerequisite: Must be at a safepoint.
60 void apply_closure_and_empty(SATBBufferClosure* cl);
61
62 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
63 // definition for more information.
64 virtual bool should_enqueue_buffer();
65
66 #ifndef PRODUCT
67 // Helpful for debugging
68 void print(const char* name);
69 static void print(const char* name, void** buf, size_t index, size_t sz);
70 #endif // PRODUCT
71
72 // Compiler support.
114 void filter_thread_buffers();
115
116 // If there exists some completed buffer, pop and process it, and
117 // return true. Otherwise return false. Processing a buffer
118 // consists of applying the closure to the buffer range starting
119 // with the first non-NULL entry to the end of the buffer; the
120 // leading entries may be NULL due to filtering.
121 bool apply_closure_to_completed_buffer(SATBBufferClosure* cl);
122
123 #ifndef PRODUCT
124 // Helpful for debugging
125 void print_all(const char* msg);
126 #endif // PRODUCT
127
128 SATBMarkQueue* shared_satb_queue() { return &_shared_satb_queue; }
129
130 // If a marking is being abandoned, reset any unprocessed log buffers.
131 void abandon_partial_marking();
132 };
133
134 #endif // SHARE_VM_GC_G1_SATBMARKQUEUE_HPP
|
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_SHARED_SATBMARKQUEUE_HPP
26 #define SHARE_VM_GC_SHARED_SATBMARKQUEUE_HPP
27
28 #include "gc/shared/ptrQueue.hpp"
29 #include "memory/allocation.hpp"
30
31 class JavaThread;
32 class SATBMarkQueueSet;
33
34 // Base class for processing the contents of a SATB buffer.
35 class SATBBufferClosure : public StackObj {
36 protected:
37 ~SATBBufferClosure() { }
38
39 public:
40 // Process the SATB entries in the designated buffer range.
41 virtual void do_buffer(void** buffer, size_t size) = 0;
42 };
43
44 // A PtrQueue whose elements are (possibly stale) pointers to object heads.
45 class SATBMarkQueue: public PtrQueue {
46 friend class SATBMarkQueueSet;
47
48 private:
49 // Filter out unwanted entries from the buffer.
50 void filter();
51
52 template <class HeapType>
53 void filter_impl();
54
55 public:
56
57 // Add "pre_val" to a set of objects that may have been disconnected from the
58 // pre-marking object graph.
59 static void enqueue(oop pre_val);
60
61 SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent = false);
62
63 // Process queue entries and free resources.
64 void flush();
65
66 // Apply cl to the active part of the buffer.
67 // Prerequisite: Must be at a safepoint.
68 void apply_closure_and_empty(SATBBufferClosure* cl);
69
70 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
71 // definition for more information.
72 virtual bool should_enqueue_buffer();
73
74 #ifndef PRODUCT
75 // Helpful for debugging
76 void print(const char* name);
77 static void print(const char* name, void** buf, size_t index, size_t sz);
78 #endif // PRODUCT
79
80 // Compiler support.
122 void filter_thread_buffers();
123
124 // If there exists some completed buffer, pop and process it, and
125 // return true. Otherwise return false. Processing a buffer
126 // consists of applying the closure to the buffer range starting
127 // with the first non-NULL entry to the end of the buffer; the
128 // leading entries may be NULL due to filtering.
129 bool apply_closure_to_completed_buffer(SATBBufferClosure* cl);
130
131 #ifndef PRODUCT
132 // Helpful for debugging
133 void print_all(const char* msg);
134 #endif // PRODUCT
135
136 SATBMarkQueue* shared_satb_queue() { return &_shared_satb_queue; }
137
138 // If a marking is being abandoned, reset any unprocessed log buffers.
139 void abandon_partial_marking();
140 };
141
142 #endif // SHARE_VM_GC_SHARED_SATBMARKQUEUE_HPP
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