1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
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 *
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_SERIAL_MARKSWEEP_HPP
26 #define SHARE_VM_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/markOop.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 OopsInGenClosure {
60 public:
61 virtual void do_oop(oop* p);
62 virtual void do_oop(narrowOop* p);
63 };
64
65 class FollowStackClosure: public VoidClosure {
66 public:
67 virtual void do_void();
68 };
69
70 // Used for java/lang/ref handling
71 class IsAliveClosure: public BoolObjectClosure {
72 public:
73 virtual bool do_object_b(oop p);
74 };
75
76 class KeepAliveClosure: public OopClosure {
77 protected:
78 template <class T> void do_oop_work(T* p);
79 public:
80 virtual void do_oop(oop* p);
81 virtual void do_oop(narrowOop* p);
82 };
83
84 //
85 // Friend decls
86 //
87 friend class AdjustPointerClosure;
88 friend class KeepAliveClosure;
89 friend class VM_MarkSweep;
90 friend void marksweep_init();
91
92 //
93 // Vars
94 //
95 protected:
96 // Total invocations of a MarkSweep collection
97 static uint _total_invocations;
98
99 // Traversal stacks used during phase1
100 static Stack<oop, mtGC> _marking_stack;
101 static Stack<ObjArrayTask, mtGC> _objarray_stack;
102
103 // Space for storing/restoring mark word
104 static Stack<markOop, mtGC> _preserved_mark_stack;
105 static Stack<oop, mtGC> _preserved_oop_stack;
106 static size_t _preserved_count;
107 static size_t _preserved_count_max;
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 // Public closures
121 static IsAliveClosure is_alive;
122 static FollowRootClosure follow_root_closure;
123 static MarkAndPushClosure mark_and_push_closure;
124 static FollowStackClosure follow_stack_closure;
125 static CLDToOopClosure follow_cld_closure;
126 static AdjustPointerClosure adjust_pointer_closure;
127 static CLDToOopClosure adjust_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, markOop 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(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(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 ExtendedOopClosure {
173 public:
174 template <typename T> void do_oop_nv(T* p);
175 virtual void do_oop(oop* p);
176 virtual void do_oop(narrowOop* p);
177
178 virtual bool do_metadata();
179 bool do_metadata_nv();
180
181 virtual void do_klass(Klass* k);
182 void do_klass_nv(Klass* k);
183
184 virtual void do_cld(ClassLoaderData* cld);
185 void do_cld_nv(ClassLoaderData* cld);
186
187 void set_ref_processor(ReferenceProcessor* rp) {
188 set_ref_processor_internal(rp);
189 }
190 };
191
192 class AdjustPointerClosure: public OopsInGenClosure {
193 public:
194 template <typename T> void do_oop_nv(T* p);
195 virtual void do_oop(oop* p);
196 virtual void do_oop(narrowOop* p);
197 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
198
199 // This closure provides its own oop verification code.
200 debug_only(virtual bool should_verify_oops() { return false; })
201 };
202
203 class PreservedMark VALUE_OBJ_CLASS_SPEC {
204 private:
205 oop _obj;
206 markOop _mark;
207
208 public:
209 void init(oop obj, markOop mark) {
210 _obj = obj;
211 _mark = mark;
212 }
213
214 void adjust_pointer();
215 void restore();
216 };
217
218 #endif // SHARE_VM_GC_SERIAL_MARKSWEEP_HPP