Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/satbQueue.hpp @ 4114:6729bbc1fcd6
7003454: order constants in constant table by number of references in code
Reviewed-by: kvn, never, bdelsart
author | twisti |
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date | Wed, 16 Nov 2011 01:39:50 -0800 |
parents | 7e37af9d69ef |
children | 2ace1c4ee8da |
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342 | 1 /* |
2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP | |
27 | |
28 #include "gc_implementation/g1/ptrQueue.hpp" | |
29 | |
342 | 30 class ObjectClosure; |
31 class JavaThread; | |
32 | |
33 // A ptrQueue whose elements are "oops", pointers to object heads. | |
34 class ObjPtrQueue: public PtrQueue { | |
35 public: | |
2149 | 36 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) : |
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37 // SATB queues are only active during marking cycles. We create |
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38 // them with their active field set to false. If a thread is |
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39 // created during a cycle and its SATB queue needs to be activated |
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40 // before the thread starts running, we'll need to set its active |
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41 // field to true. This is done in JavaThread::initialize_queues(). |
2149 | 42 PtrQueue(qset, perm, false /* active */) { } |
43 | |
44 // Overrides PtrQueue::should_enqueue_buffer(). See the method's | |
45 // definition for more information. | |
46 virtual bool should_enqueue_buffer(); | |
47 | |
342 | 48 // Apply the closure to all elements, and reset the index to make the |
49 // buffer empty. | |
50 void apply_closure(ObjectClosure* cl); | |
51 | |
52 // Apply the closure to all elements of "buf", down to "index" (inclusive.) | |
53 static void apply_closure_to_buffer(ObjectClosure* cl, | |
54 void** buf, size_t index, size_t sz); | |
55 | |
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56 void verify_oops_in_buffer() NOT_DEBUG_RETURN; |
342 | 57 }; |
58 | |
59 | |
60 | |
61 class SATBMarkQueueSet: public PtrQueueSet { | |
62 ObjectClosure* _closure; | |
63 ObjectClosure** _par_closures; // One per ParGCThread. | |
64 | |
65 ObjPtrQueue _shared_satb_queue; | |
66 | |
67 // Utility function to support sequential and parallel versions. If | |
68 // "par" is true, then "worker" is the par thread id; if "false", worker | |
69 // is ignored. | |
70 bool apply_closure_to_completed_buffer_work(bool par, int worker); | |
71 | |
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72 #ifdef ASSERT |
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73 void dump_active_values(JavaThread* first, bool expected_active); |
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74 #endif // ASSERT |
342 | 75 |
76 public: | |
77 SATBMarkQueueSet(); | |
78 | |
79 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 80 int process_completed_threshold, |
81 Mutex* lock); | |
342 | 82 |
83 static void handle_zero_index_for_thread(JavaThread* t); | |
84 | |
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85 // Apply "set_active(b)" to all Java threads' SATB queues. It should be |
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86 // called only with the world stopped. The method will assert that the |
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87 // SATB queues of all threads it visits, as well as the SATB queue |
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88 // set itself, has an active value same as expected_active. |
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89 void set_active_all_threads(bool b, bool expected_active); |
342 | 90 |
91 // Register "blk" as "the closure" for all queues. Only one such closure | |
92 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
93 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
94 // applies it to partially-filled buffers (the latter should only be done | |
95 // with the world stopped). | |
96 void set_closure(ObjectClosure* closure); | |
97 // Set the parallel closures: pointer is an array of pointers to | |
98 // closures, one for each parallel GC thread. | |
99 void set_par_closure(int i, ObjectClosure* closure); | |
100 | |
101 // If there is a registered closure for buffers, apply it to all entries | |
102 // in all currently-active buffers. This should only be applied at a | |
103 // safepoint. (Currently must not be called in parallel; this should | |
104 // change in the future.) | |
105 void iterate_closure_all_threads(); | |
106 // Parallel version of the above. | |
107 void par_iterate_closure_all_threads(int worker); | |
108 | |
109 // If there exists some completed buffer, pop it, then apply the | |
110 // registered closure to all its elements, and return true. If no | |
111 // completed buffers exist, return false. | |
112 bool apply_closure_to_completed_buffer() { | |
113 return apply_closure_to_completed_buffer_work(false, 0); | |
114 } | |
115 // Parallel version of the above. | |
116 bool par_apply_closure_to_completed_buffer(int worker) { | |
117 return apply_closure_to_completed_buffer_work(true, worker); | |
118 } | |
119 | |
120 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } | |
121 | |
122 // If a marking is being abandoned, reset any unprocessed log buffers. | |
123 void abandon_partial_marking(); | |
124 | |
125 }; | |
1972 | 126 |
127 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |