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 VALUE_OBJ_CLASS_SPEC {
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_FlatProfiler_oops_do,
60 SHENANDOAH_RP_PS_Management_oops_do,
61 SHENANDOAH_RP_PS_SystemDictionary_oops_do,
62 SHENANDOAH_RP_PS_ClassLoaderDataGraph_oops_do,
63 SHENANDOAH_RP_PS_jvmti_oops_do,
64 SHENANDOAH_RP_PS_CodeCache_oops_do,
65 // Leave this one last.
66 SHENANDOAH_RP_PS_NumElements
67 };
68
69 class ShenandoahRootProcessor : public StackObj {
70 SubTasksDone* _process_strong_tasks;
71 StrongRootsScope _srs;
72 ShenandoahPhaseTimings::Phase _phase;
73 ParallelCLDRootIterator _cld_iterator;
74 ShenandoahAllCodeRootsIterator _coderoots_all_iterator;
75 ParallelObjectSynchronizerIterator _om_iterator;
76 CodeBlobClosure* _threads_nmethods_cl;
77
78 void process_java_roots(OopClosure* scan_non_heap_roots,
79 CLDClosure* scan_strong_clds,
80 CLDClosure* scan_weak_clds,
81 CodeBlobClosure* scan_strong_code,
82 CodeBlobClosure* nmethods_cl,
83 ThreadClosure* thread_cl,
84 uint worker_i);
85
86 void process_vm_roots(OopClosure* scan_non_heap_roots,
87 OopClosure* scan_non_heap_weak_roots,
88 OopClosure* weak_jni_roots,
89 uint worker_i);
90
91 public:
92 ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
93 ShenandoahPhaseTimings::Phase phase);
94 ~ShenandoahRootProcessor();
95
96 // Apply oops, clds and blobs to all strongly reachable roots in the system
97 void process_strong_roots(OopClosure* oops, OopClosure* weak_oops,
98 CLDClosure* clds,
99 CLDClosure* weak_clds,
100 CodeBlobClosure* blobs,
101 ThreadClosure* thread_cl,
102 uint worker_id);
103
104 // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
105 void process_all_roots(OopClosure* oops, OopClosure* weak_oops,
106 CLDClosure* clds,
107 CodeBlobClosure* blobs,
108 ThreadClosure* thread_cl,
109 uint worker_id);
110
111 // For slow debug/verification code
112 void process_all_roots_slow(OopClosure* oops);
113
114 // Number of worker threads used by the root processor.
115 uint n_workers() const;
116 };
117
118 class ShenandoahRootEvacuator : public StackObj {
119 SubTasksDone* _process_strong_tasks;
120 StrongRootsScope _srs;
121 ShenandoahPhaseTimings::Phase _phase;
122 ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;
123 CodeBlobClosure* _threads_nmethods_cl;
124
125 public:
126 ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,
127 ShenandoahPhaseTimings::Phase phase);
128 ~ShenandoahRootEvacuator();
129
130 void process_evacuate_roots(OopClosure* oops,
131 CodeBlobClosure* blobs,
132 uint worker_id);
133
134 // Number of worker threads used by the root processor.
135 uint n_workers() const;
136 };
137 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP