1 /*
2 * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
26
27 #include "classfile/classLoaderData.hpp"
28 #include "code/codeCache.hpp"
29 #include "gc/shenandoah/shenandoahHeap.hpp"
30 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
31 #include "gc/shared/strongRootsScope.hpp"
32 #include "gc/shared/workgroup.hpp"
33 #include "memory/allocation.hpp"
34 #include "runtime/mutex.hpp"
35 #include "shenandoahCodeRoots.hpp"
36
37 class CLDClosure;
38 class CodeBlobClosure;
39 class G1CollectedHeap;
40 class G1GCPhaseTimes;
41 class G1ParPushHeapRSClosure;
42 class Monitor;
43 class OopClosure;
44 class SubTasksDone;
45
46
47 class ParallelCLDRootIterator {
48 public:
49 ParallelCLDRootIterator();
50 void root_cld_do(CLDClosure* strong, CLDClosure* weak);
51 };
52
53
54 enum Shenandoah_process_roots_tasks {
55 SHENANDOAH_RP_PS_Universe_oops_do,
56 SHENANDOAH_RP_PS_JNIHandles_oops_do,
57 SHENANDOAH_RP_PS_JNIHandles_weak_oops_do,
58 SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,
59 SHENANDOAH_RP_PS_Management_oops_do,
60 SHENANDOAH_RP_PS_SystemDictionary_oops_do,
61 SHENANDOAH_RP_PS_jvmti_oops_do,
62 // Leave this one last.
63 SHENANDOAH_RP_PS_NumElements
64 };
65
66 class ShenandoahRootProcessor : public StackObj {
67 SubTasksDone* _process_strong_tasks;
68 StrongRootsScope _srs;
69 OopStorage::ParState<false, false> _par_state_string;
70 ShenandoahPhaseTimings::Phase _phase;
71 ParallelCLDRootIterator _cld_iterator;
72 ShenandoahAllCodeRootsIterator _coderoots_all_iterator;
73 ParallelObjectSynchronizerIterator _om_iterator;
74 CodeBlobClosure* _threads_nmethods_cl;
75
76 void process_java_roots(OopClosure* scan_non_heap_roots,
77 CLDClosure* scan_strong_clds,
78 CLDClosure* scan_weak_clds,
79 CodeBlobClosure* scan_strong_code,
80 ThreadClosure* thread_cl,
81 uint worker_i);
82
83 void process_vm_roots(OopClosure* scan_non_heap_roots,
84 OopClosure* scan_non_heap_weak_roots,
85 OopClosure* weak_jni_roots,
86 uint worker_i);
87
88 public:
89 ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
90 ShenandoahPhaseTimings::Phase phase);
91 ~ShenandoahRootProcessor();
92
93 // Apply oops, clds and blobs to all strongly reachable roots in the system
94 void process_strong_roots(OopClosure* oops, OopClosure* weak_oops,
95 CLDClosure* clds,
96 CLDClosure* weak_clds,
97 CodeBlobClosure* blobs,
98 ThreadClosure* thread_cl,
99 uint worker_id);
100
101 // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
102 void process_all_roots(OopClosure* oops, OopClosure* weak_oops,
103 CLDClosure* clds,
104 CodeBlobClosure* blobs,
105 ThreadClosure* thread_cl,
106 uint worker_id);
107
108 // For slow debug/verification code
109 void process_all_roots_slow(OopClosure* oops);
110
111 // Number of worker threads used by the root processor.
112 uint n_workers() const;
113 };
114
115 class ShenandoahRootEvacuator : public StackObj {
116 StrongRootsScope _srs;
117 ShenandoahPhaseTimings::Phase _phase;
118 ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;
119
120 public:
121 ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,
122 ShenandoahPhaseTimings::Phase phase);
123 ~ShenandoahRootEvacuator();
124
125 void process_evacuate_roots(OopClosure* oops,
126 CodeBlobClosure* blobs,
127 uint worker_id);
128
129 // Number of worker threads used by the root processor.
130 uint n_workers() const;
131 };
132 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP