Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 6820:097d78aaf2b5
7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
Reviewed-by: johnc, mgerdin, jwilhelm
author | jmasa |
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date | Thu, 04 Oct 2012 10:40:23 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/universe.hpp" | |
30 #include "oops/markOop.hpp" | |
31 #include "oops/oop.hpp" | |
32 #include "runtime/timer.hpp" | |
33 #include "utilities/growableArray.hpp" | |
34 #include "utilities/stack.hpp" | |
35 #include "utilities/taskqueue.hpp" | |
36 | |
0 | 37 class ReferenceProcessor; |
941 | 38 class DataLayout; |
0 | 39 |
40 // MarkSweep takes care of global mark-compact garbage collection for a | |
41 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All | |
42 // generations are assumed to support marking; those that can also support | |
43 // compaction. | |
44 // | |
45 // Class unloading will only occur when a full gc is invoked. | |
46 | |
47 // If VALIDATE_MARK_SWEEP is defined, the -XX:+ValidateMarkSweep flag will | |
48 // be operational, and will provide slow but comprehensive self-checks within | |
49 // the GC. This is not enabled by default in product or release builds, | |
50 // since the extra call to track_adjusted_pointer() in _adjust_pointer() | |
51 // would be too much overhead, and would disturb performance measurement. | |
52 // However, debug builds are sometimes way too slow to run GC tests! | |
53 #ifdef ASSERT | |
54 #define VALIDATE_MARK_SWEEP 1 | |
55 #endif | |
56 #ifdef VALIDATE_MARK_SWEEP | |
57 #define VALIDATE_MARK_SWEEP_ONLY(code) code | |
58 #else | |
59 #define VALIDATE_MARK_SWEEP_ONLY(code) | |
60 #endif | |
61 | |
62 // declared at end | |
63 class PreservedMark; | |
64 | |
65 class MarkSweep : AllStatic { | |
66 // | |
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67 // Inline closure decls |
0 | 68 // |
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69 class FollowRootClosure: public OopsInGenClosure { |
0 | 70 public: |
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71 virtual void do_oop(oop* p); |
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72 virtual void do_oop(narrowOop* p); |
0 | 73 }; |
74 | |
75 class MarkAndPushClosure: public OopClosure { | |
76 public: | |
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77 virtual void do_oop(oop* p); |
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78 virtual void do_oop(narrowOop* p); |
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79 }; |
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80 |
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81 // The one and only place to start following the classes. |
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82 // Should only be applied to the ClassLoaderData klasses list. |
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83 class FollowKlassClosure : public KlassClosure { |
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84 public: |
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85 void do_klass(Klass* klass); |
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86 }; |
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87 class AdjustKlassClosure : public KlassClosure { |
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88 public: |
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89 void do_klass(Klass* klass); |
0 | 90 }; |
91 | |
92 class FollowStackClosure: public VoidClosure { | |
93 public: | |
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94 virtual void do_void(); |
0 | 95 }; |
96 | |
97 class AdjustPointerClosure: public OopsInGenClosure { | |
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98 private: |
0 | 99 bool _is_root; |
100 public: | |
101 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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102 virtual void do_oop(oop* p); |
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103 virtual void do_oop(narrowOop* p); |
0 | 104 }; |
105 | |
106 // Used for java/lang/ref handling | |
107 class IsAliveClosure: public BoolObjectClosure { | |
108 public: | |
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109 virtual void do_object(oop p); |
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110 virtual bool do_object_b(oop p); |
0 | 111 }; |
112 | |
113 class KeepAliveClosure: public OopClosure { | |
113
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114 protected: |
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115 template <class T> void do_oop_work(T* p); |
0 | 116 public: |
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117 virtual void do_oop(oop* p); |
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118 virtual void do_oop(narrowOop* p); |
0 | 119 }; |
120 | |
121 // | |
122 // Friend decls | |
123 // | |
124 friend class AdjustPointerClosure; | |
125 friend class KeepAliveClosure; | |
126 friend class VM_MarkSweep; | |
127 friend void marksweep_init(); | |
128 | |
129 // | |
130 // Vars | |
131 // | |
132 protected: | |
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133 // Total invocations of a MarkSweep collection |
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134 static unsigned int _total_invocations; |
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135 |
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136 // Traversal stacks used during phase1 |
6197 | 137 static Stack<oop, mtGC> _marking_stack; |
138 static Stack<ObjArrayTask, mtGC> _objarray_stack; | |
0 | 139 |
140 // Space for storing/restoring mark word | |
6197 | 141 static Stack<markOop, mtGC> _preserved_mark_stack; |
142 static Stack<oop, mtGC> _preserved_oop_stack; | |
0 | 143 static size_t _preserved_count; |
144 static size_t _preserved_count_max; | |
145 static PreservedMark* _preserved_marks; | |
146 | |
147 // Reference processing (used in ...follow_contents) | |
148 static ReferenceProcessor* _ref_processor; | |
149 | |
150 #ifdef VALIDATE_MARK_SWEEP | |
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151 static GrowableArray<void*>* _root_refs_stack; |
0 | 152 static GrowableArray<oop> * _live_oops; |
153 static GrowableArray<oop> * _live_oops_moved_to; | |
154 static GrowableArray<size_t>* _live_oops_size; | |
155 static size_t _live_oops_index; | |
156 static size_t _live_oops_index_at_perm; | |
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157 static GrowableArray<void*>* _other_refs_stack; |
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158 static GrowableArray<void*>* _adjusted_pointers; |
0 | 159 static bool _pointer_tracking; |
160 static bool _root_tracking; | |
161 | |
162 // The following arrays are saved since the time of the last GC and | |
163 // assist in tracking down problems where someone has done an errant | |
164 // store into the heap, usually to an oop that wasn't properly | |
165 // handleized across a GC. If we crash or otherwise fail before the | |
166 // next GC, we can query these arrays to find out the object we had | |
167 // intended to do the store to (assuming it is still alive) and the | |
168 // offset within that object. Covered under RecordMarkSweepCompaction. | |
169 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
170 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
171 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
172 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
173 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
174 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
175 #endif | |
176 | |
177 // Non public closures | |
178 static KeepAliveClosure keep_alive; | |
179 | |
180 // Debugging | |
181 static void trace(const char* msg) PRODUCT_RETURN; | |
182 | |
183 public: | |
184 // Public closures | |
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185 static IsAliveClosure is_alive; |
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186 static FollowRootClosure follow_root_closure; |
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187 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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188 static MarkAndPushClosure mark_and_push_closure; |
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189 static FollowKlassClosure follow_klass_closure; |
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190 static FollowStackClosure follow_stack_closure; |
0 | 191 static AdjustPointerClosure adjust_root_pointer_closure; |
192 static AdjustPointerClosure adjust_pointer_closure; | |
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193 static AdjustKlassClosure adjust_klass_closure; |
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194 |
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195 // Accessors |
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196 static unsigned int total_invocations() { return _total_invocations; } |
0 | 197 |
198 // Reference Processing | |
199 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
200 | |
201 // Call backs for marking | |
202 static void mark_object(oop obj); | |
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203 // Mark pointer and follow contents. Empty marking stack afterwards. |
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204 template <class T> static inline void follow_root(T* p); |
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205 |
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206 // Check mark and maybe push on marking stack |
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207 template <class T> static void mark_and_push(T* p); |
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208 |
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209 static inline void push_objarray(oop obj, size_t index); |
0 | 210 |
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211 static void follow_stack(); // Empty marking stack. |
0 | 212 |
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213 static void follow_klass(Klass* klass); |
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214 static void adjust_klass(Klass* klass); |
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215 |
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216 static void follow_class_loader(ClassLoaderData* cld); |
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217 static void adjust_class_loader(ClassLoaderData* cld); |
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218 |
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219 static void preserve_mark(oop p, markOop mark); |
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220 // Save the mark word so it can be restored later |
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221 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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222 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 223 |
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224 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
0 | 225 |
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226 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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227 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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228 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
0 | 229 |
230 #ifdef VALIDATE_MARK_SWEEP | |
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231 static void track_adjusted_pointer(void* p, bool isroot); |
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232 static void check_adjust_pointer(void* p); |
0 | 233 static void track_interior_pointers(oop obj); |
234 static void check_interior_pointers(); | |
235 | |
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236 static void reset_live_oop_tracking(); |
0 | 237 static void register_live_oop(oop p, size_t size); |
238 static void validate_live_oop(oop p, size_t size); | |
239 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
240 static void compaction_complete(); | |
241 | |
242 // Querying operation of RecordMarkSweepCompaction results. | |
243 // Finds and prints the current base oop and offset for a word | |
244 // within an oop that was live during the last GC. Helpful for | |
245 // tracking down heap stomps. | |
246 static void print_new_location_of_heap_address(HeapWord* q); | |
247 #endif | |
248 }; | |
249 | |
250 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
251 private: | |
252 oop _obj; | |
253 markOop _mark; | |
254 | |
255 public: | |
256 void init(oop obj, markOop mark) { | |
257 _obj = obj; | |
258 _mark = mark; | |
259 } | |
260 | |
261 void adjust_pointer() { | |
262 MarkSweep::adjust_pointer(&_obj); | |
263 } | |
264 | |
265 void restore() { | |
266 _obj->set_mark(_mark); | |
267 } | |
268 }; | |
1972 | 269 |
270 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |