Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 3378:69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
Summary: During an evacuation pause clear the region fields of any concurrent marking task whose local finger points into the collection set as the values in the region fields will become stale. Clearing these fields causes the concurrent mark task to claim a new region when marking restarts after the pause.
Reviewed-by: tonyp, iveresov
author | johnc |
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date | Tue, 17 May 2011 00:56:01 -0700 |
parents | 063382f9b575 |
children | c3f1170908be |
rev | line source |
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342 | 1 /* |
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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_HEAPREGION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP | |
27 | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" | |
30 #include "gc_implementation/g1/survRateGroup.hpp" | |
31 #include "gc_implementation/shared/ageTable.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "memory/watermark.hpp" | |
35 | |
342 | 36 #ifndef SERIALGC |
37 | |
38 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
39 // can be collected independently. | |
40 | |
41 // NOTE: Although a HeapRegion is a Space, its | |
42 // Space::initDirtyCardClosure method must not be called. | |
43 // The problem is that the existence of this method breaks | |
44 // the independence of barrier sets from remembered sets. | |
45 // The solution is to remove this method from the definition | |
46 // of a Space. | |
47 | |
48 class CompactibleSpace; | |
49 class ContiguousSpace; | |
50 class HeapRegionRemSet; | |
51 class HeapRegionRemSetIterator; | |
52 class HeapRegion; | |
2152 | 53 class HeapRegionSetBase; |
54 | |
55 #define HR_FORMAT "%d:["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" | |
2361 | 56 #define HR_FORMAT_PARAMS(_hr_) (_hr_)->hrs_index(), (_hr_)->bottom(), \ |
57 (_hr_)->top(), (_hr_)->end() | |
342 | 58 |
59 // A dirty card to oop closure for heap regions. It | |
60 // knows how to get the G1 heap and how to use the bitmap | |
61 // in the concurrent marker used by G1 to filter remembered | |
62 // sets. | |
63 | |
64 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
65 public: | |
66 // Specification of possible DirtyCardToOopClosure filtering. | |
67 enum FilterKind { | |
68 NoFilterKind, | |
69 IntoCSFilterKind, | |
70 OutOfRegionFilterKind | |
71 }; | |
72 | |
73 protected: | |
74 HeapRegion* _hr; | |
75 FilterKind _fk; | |
76 G1CollectedHeap* _g1; | |
77 | |
78 void walk_mem_region_with_cl(MemRegion mr, | |
79 HeapWord* bottom, HeapWord* top, | |
80 OopClosure* cl); | |
81 | |
82 // We don't specialize this for FilteringClosure; filtering is handled by | |
83 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
84 // warning. | |
85 void walk_mem_region_with_cl(MemRegion mr, | |
86 HeapWord* bottom, HeapWord* top, | |
87 FilteringClosure* cl) { | |
88 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
89 (OopClosure*)cl); | |
90 } | |
91 | |
92 // Get the actual top of the area on which the closure will | |
93 // operate, given where the top is assumed to be (the end of the | |
94 // memory region passed to do_MemRegion) and where the object | |
95 // at the top is assumed to start. For example, an object may | |
96 // start at the top but actually extend past the assumed top, | |
97 // in which case the top becomes the end of the object. | |
98 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
99 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
100 } | |
101 | |
102 // Walk the given memory region from bottom to (actual) top | |
103 // looking for objects and applying the oop closure (_cl) to | |
104 // them. The base implementation of this treats the area as | |
105 // blocks, where a block may or may not be an object. Sub- | |
106 // classes should override this to provide more accurate | |
107 // or possibly more efficient walking. | |
108 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
109 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
110 } | |
111 | |
112 public: | |
113 HeapRegionDCTOC(G1CollectedHeap* g1, | |
114 HeapRegion* hr, OopClosure* cl, | |
115 CardTableModRefBS::PrecisionStyle precision, | |
116 FilterKind fk); | |
117 }; | |
118 | |
119 | |
120 // The complicating factor is that BlockOffsetTable diverged | |
121 // significantly, and we need functionality that is only in the G1 version. | |
122 // So I copied that code, which led to an alternate G1 version of | |
123 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
124 // be reconciled, then G1OffsetTableContigSpace could go away. | |
125 | |
126 // The idea behind time stamps is the following. Doing a save_marks on | |
127 // all regions at every GC pause is time consuming (if I remember | |
128 // well, 10ms or so). So, we would like to do that only for regions | |
129 // that are GC alloc regions. To achieve this, we use time | |
130 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
131 // unique time stamp (essentially a counter that gets | |
132 // incremented). Every time we want to call save_marks on a region, | |
133 // we set the saved_mark_word to top and also copy the current GC | |
134 // time stamp to the time stamp field of the space. Reading the | |
135 // saved_mark_word involves checking the time stamp of the | |
136 // region. If it is the same as the current GC time stamp, then we | |
137 // can safely read the saved_mark_word field, as it is valid. If the | |
138 // time stamp of the region is not the same as the current GC time | |
139 // stamp, then we instead read top, as the saved_mark_word field is | |
140 // invalid. Time stamps (on the regions and also on the | |
141 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
142 // the regions anyway) and at the end of a Full GC. The current scheme | |
143 // that uses sequential unsigned ints will fail only if we have 4b | |
144 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
145 | |
146 class G1OffsetTableContigSpace: public ContiguousSpace { | |
147 friend class VMStructs; | |
148 protected: | |
149 G1BlockOffsetArrayContigSpace _offsets; | |
150 Mutex _par_alloc_lock; | |
151 volatile unsigned _gc_time_stamp; | |
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152 // When we need to retire an allocation region, while other threads |
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153 // are also concurrently trying to allocate into it, we typically |
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154 // allocate a dummy object at the end of the region to ensure that |
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155 // no more allocations can take place in it. However, sometimes we |
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156 // want to know where the end of the last "real" object we allocated |
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157 // into the region was and this is what this keeps track. |
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158 HeapWord* _pre_dummy_top; |
342 | 159 |
160 public: | |
161 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
162 // assumed to contain zeros. | |
163 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
164 MemRegion mr, bool is_zeroed = false); | |
165 | |
166 void set_bottom(HeapWord* value); | |
167 void set_end(HeapWord* value); | |
168 | |
169 virtual HeapWord* saved_mark_word() const; | |
170 virtual void set_saved_mark(); | |
171 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
172 | |
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173 // See the comment above in the declaration of _pre_dummy_top for an |
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174 // explanation of what it is. |
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175 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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176 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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177 _pre_dummy_top = pre_dummy_top; |
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178 } |
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179 HeapWord* pre_dummy_top() { |
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180 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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181 } |
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182 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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183 |
356 | 184 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
185 virtual void clear(bool mangle_space); | |
342 | 186 |
187 HeapWord* block_start(const void* p); | |
188 HeapWord* block_start_const(const void* p) const; | |
189 | |
190 // Add offset table update. | |
191 virtual HeapWord* allocate(size_t word_size); | |
192 HeapWord* par_allocate(size_t word_size); | |
193 | |
194 // MarkSweep support phase3 | |
195 virtual HeapWord* initialize_threshold(); | |
196 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
197 | |
198 virtual void print() const; | |
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199 |
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200 void reset_bot() { |
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201 _offsets.zero_bottom_entry(); |
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202 _offsets.initialize_threshold(); |
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203 } |
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204 |
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205 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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206 _offsets.alloc_block(start, word_size); |
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207 } |
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208 |
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209 void print_bot_on(outputStream* out) { |
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210 _offsets.print_on(out); |
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211 } |
342 | 212 }; |
213 | |
214 class HeapRegion: public G1OffsetTableContigSpace { | |
215 friend class VMStructs; | |
216 private: | |
217 | |
355 | 218 enum HumongousType { |
219 NotHumongous = 0, | |
220 StartsHumongous, | |
221 ContinuesHumongous | |
222 }; | |
223 | |
342 | 224 // The next filter kind that should be used for a "new_dcto_cl" call with |
225 // the "traditional" signature. | |
226 HeapRegionDCTOC::FilterKind _next_fk; | |
227 | |
228 // Requires that the region "mr" be dense with objects, and begin and end | |
229 // with an object. | |
230 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
231 | |
232 // The remembered set for this region. | |
233 // (Might want to make this "inline" later, to avoid some alloc failure | |
234 // issues.) | |
235 HeapRegionRemSet* _rem_set; | |
236 | |
237 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
238 | |
239 protected: | |
240 // If this region is a member of a HeapRegionSeq, the index in that | |
241 // sequence, otherwise -1. | |
242 int _hrs_index; | |
243 | |
355 | 244 HumongousType _humongous_type; |
342 | 245 // For a humongous region, region in which it starts. |
246 HeapRegion* _humongous_start_region; | |
247 // For the start region of a humongous sequence, it's original end(). | |
248 HeapWord* _orig_end; | |
249 | |
250 // True iff the region is in current collection_set. | |
251 bool _in_collection_set; | |
252 | |
253 // Is this or has it been an allocation region in the current collection | |
254 // pause. | |
255 bool _is_gc_alloc_region; | |
256 | |
257 // True iff an attempt to evacuate an object in the region failed. | |
258 bool _evacuation_failed; | |
259 | |
260 // A heap region may be a member one of a number of special subsets, each | |
261 // represented as linked lists through the field below. Currently, these | |
262 // sets include: | |
263 // The collection set. | |
264 // The set of allocation regions used in a collection pause. | |
265 // Spaces that may contain gray objects. | |
266 HeapRegion* _next_in_special_set; | |
267 | |
268 // next region in the young "generation" region set | |
269 HeapRegion* _next_young_region; | |
270 | |
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271 // Next region whose cards need cleaning |
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272 HeapRegion* _next_dirty_cards_region; |
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273 |
2152 | 274 // Fields used by the HeapRegionSetBase class and subclasses. |
275 HeapRegion* _next; | |
276 #ifdef ASSERT | |
277 HeapRegionSetBase* _containing_set; | |
278 #endif // ASSERT | |
279 bool _pending_removal; | |
280 | |
342 | 281 // For parallel heapRegion traversal. |
282 jint _claimed; | |
283 | |
284 // We use concurrent marking to determine the amount of live data | |
285 // in each heap region. | |
286 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
287 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
288 | |
289 // See "sort_index" method. -1 means is not in the array. | |
290 int _sort_index; | |
291 | |
292 // <PREDICTION> | |
293 double _gc_efficiency; | |
294 // </PREDICTION> | |
295 | |
296 enum YoungType { | |
297 NotYoung, // a region is not young | |
298 Young, // a region is young | |
299 Survivor // a region is young and it contains | |
300 // survivor | |
301 }; | |
302 | |
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303 volatile YoungType _young_type; |
342 | 304 int _young_index_in_cset; |
305 SurvRateGroup* _surv_rate_group; | |
306 int _age_index; | |
307 | |
308 // The start of the unmarked area. The unmarked area extends from this | |
309 // word until the top and/or end of the region, and is the part | |
310 // of the region for which no marking was done, i.e. objects may | |
311 // have been allocated in this part since the last mark phase. | |
312 // "prev" is the top at the start of the last completed marking. | |
313 // "next" is the top at the start of the in-progress marking (if any.) | |
314 HeapWord* _prev_top_at_mark_start; | |
315 HeapWord* _next_top_at_mark_start; | |
316 // If a collection pause is in progress, this is the top at the start | |
317 // of that pause. | |
318 | |
319 // We've counted the marked bytes of objects below here. | |
320 HeapWord* _top_at_conc_mark_count; | |
321 | |
322 void init_top_at_mark_start() { | |
323 assert(_prev_marked_bytes == 0 && | |
324 _next_marked_bytes == 0, | |
325 "Must be called after zero_marked_bytes."); | |
326 HeapWord* bot = bottom(); | |
327 _prev_top_at_mark_start = bot; | |
328 _next_top_at_mark_start = bot; | |
329 _top_at_conc_mark_count = bot; | |
330 } | |
331 | |
332 void set_young_type(YoungType new_type) { | |
333 //assert(_young_type != new_type, "setting the same type" ); | |
334 // TODO: add more assertions here | |
335 _young_type = new_type; | |
336 } | |
337 | |
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338 // Cached attributes used in the collection set policy information |
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339 |
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340 // The RSet length that was added to the total value |
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341 // for the collection set. |
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342 size_t _recorded_rs_length; |
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343 |
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344 // The predicted elapsed time that was added to total value |
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345 // for the collection set. |
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346 double _predicted_elapsed_time_ms; |
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347 |
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348 // The predicted number of bytes to copy that was added to |
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349 // the total value for the collection set. |
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350 size_t _predicted_bytes_to_copy; |
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351 |
342 | 352 public: |
353 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
354 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
355 MemRegion mr, bool is_zeroed); | |
356 | |
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357 static int LogOfHRGrainBytes; |
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358 static int LogOfHRGrainWords; |
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359 // The normal type of these should be size_t. However, they used to |
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360 // be members of an enum before and they are assumed by the |
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361 // compilers to be ints. To avoid going and fixing all their uses, |
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362 // I'm declaring them as ints. I'm not anticipating heap region |
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363 // sizes to reach anywhere near 2g, so using an int here is safe. |
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364 static int GrainBytes; |
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365 static int GrainWords; |
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366 static int CardsPerRegion; |
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367 |
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368 // It sets up the heap region size (GrainBytes / GrainWords), as |
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369 // well as other related fields that are based on the heap region |
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370 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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371 // CardsPerRegion). All those fields are considered constant |
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372 // throughout the JVM's execution, therefore they should only be set |
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373 // up once during initialization time. |
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374 static void setup_heap_region_size(uintx min_heap_size); |
342 | 375 |
355 | 376 enum ClaimValues { |
377 InitialClaimValue = 0, | |
378 FinalCountClaimValue = 1, | |
379 NoteEndClaimValue = 2, | |
390 | 380 ScrubRemSetClaimValue = 3, |
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381 ParVerifyClaimValue = 4, |
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382 RebuildRSClaimValue = 5 |
355 | 383 }; |
384 | |
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385 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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386 assert(is_young(), "we can only skip BOT updates on young regions"); |
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387 return ContiguousSpace::par_allocate(word_size); |
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388 } |
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389 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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390 assert(is_young(), "we can only skip BOT updates on young regions"); |
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391 return ContiguousSpace::allocate(word_size); |
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392 } |
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393 |
342 | 394 // If this region is a member of a HeapRegionSeq, the index in that |
395 // sequence, otherwise -1. | |
396 int hrs_index() const { return _hrs_index; } | |
397 void set_hrs_index(int index) { _hrs_index = index; } | |
398 | |
399 // The number of bytes marked live in the region in the last marking phase. | |
400 size_t marked_bytes() { return _prev_marked_bytes; } | |
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401 size_t live_bytes() { |
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402 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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403 } |
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404 |
342 | 405 // The number of bytes counted in the next marking. |
406 size_t next_marked_bytes() { return _next_marked_bytes; } | |
407 // The number of bytes live wrt the next marking. | |
408 size_t next_live_bytes() { | |
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409 return |
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410 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 411 } |
412 | |
413 // A lower bound on the amount of garbage bytes in the region. | |
414 size_t garbage_bytes() { | |
415 size_t used_at_mark_start_bytes = | |
416 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
417 assert(used_at_mark_start_bytes >= marked_bytes(), | |
418 "Can't mark more than we have."); | |
419 return used_at_mark_start_bytes - marked_bytes(); | |
420 } | |
421 | |
422 // An upper bound on the number of live bytes in the region. | |
423 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
424 | |
425 void add_to_marked_bytes(size_t incr_bytes) { | |
426 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
427 guarantee( _next_marked_bytes <= used(), "invariant" ); | |
428 } | |
429 | |
430 void zero_marked_bytes() { | |
431 _prev_marked_bytes = _next_marked_bytes = 0; | |
432 } | |
433 | |
355 | 434 bool isHumongous() const { return _humongous_type != NotHumongous; } |
435 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
436 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 437 // For a humongous region, region in which it starts. |
438 HeapRegion* humongous_start_region() const { | |
439 return _humongous_start_region; | |
440 } | |
441 | |
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442 // Makes the current region be a "starts humongous" region, i.e., |
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443 // the first region in a series of one or more contiguous regions |
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444 // that will contain a single "humongous" object. The two parameters |
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445 // are as follows: |
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446 // |
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447 // new_top : The new value of the top field of this region which |
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448 // points to the end of the humongous object that's being |
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449 // allocated. If there is more than one region in the series, top |
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450 // will lie beyond this region's original end field and on the last |
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451 // region in the series. |
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452 // |
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453 // new_end : The new value of the end field of this region which |
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454 // points to the end of the last region in the series. If there is |
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455 // one region in the series (namely: this one) end will be the same |
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456 // as the original end of this region. |
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457 // |
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458 // Updating top and end as described above makes this region look as |
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459 // if it spans the entire space taken up by all the regions in the |
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460 // series and an single allocation moved its top to new_top. This |
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461 // ensures that the space (capacity / allocated) taken up by all |
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462 // humongous regions can be calculated by just looking at the |
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463 // "starts humongous" regions and by ignoring the "continues |
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464 // humongous" regions. |
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465 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 466 |
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467 // Makes the current region be a "continues humongous' |
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468 // region. first_hr is the "start humongous" region of the series |
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469 // which this region will be part of. |
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470 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 471 |
2152 | 472 // Unsets the humongous-related fields on the region. |
473 void set_notHumongous(); | |
474 | |
342 | 475 // If the region has a remembered set, return a pointer to it. |
476 HeapRegionRemSet* rem_set() const { | |
477 return _rem_set; | |
478 } | |
479 | |
480 // True iff the region is in current collection_set. | |
481 bool in_collection_set() const { | |
482 return _in_collection_set; | |
483 } | |
484 void set_in_collection_set(bool b) { | |
485 _in_collection_set = b; | |
486 } | |
487 HeapRegion* next_in_collection_set() { | |
488 assert(in_collection_set(), "should only invoke on member of CS."); | |
489 assert(_next_in_special_set == NULL || | |
490 _next_in_special_set->in_collection_set(), | |
491 "Malformed CS."); | |
492 return _next_in_special_set; | |
493 } | |
494 void set_next_in_collection_set(HeapRegion* r) { | |
495 assert(in_collection_set(), "should only invoke on member of CS."); | |
496 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
497 _next_in_special_set = r; | |
498 } | |
499 | |
500 // True iff it is or has been an allocation region in the current | |
501 // collection pause. | |
502 bool is_gc_alloc_region() const { | |
503 return _is_gc_alloc_region; | |
504 } | |
505 void set_is_gc_alloc_region(bool b) { | |
506 _is_gc_alloc_region = b; | |
507 } | |
508 HeapRegion* next_gc_alloc_region() { | |
509 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
510 assert(_next_in_special_set == NULL || | |
511 _next_in_special_set->is_gc_alloc_region(), | |
512 "Malformed CS."); | |
513 return _next_in_special_set; | |
514 } | |
515 void set_next_gc_alloc_region(HeapRegion* r) { | |
516 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
517 assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS."); | |
518 _next_in_special_set = r; | |
519 } | |
520 | |
2152 | 521 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 522 |
2152 | 523 // Getter and setter for the next field used to link regions into |
524 // linked lists. | |
525 HeapRegion* next() { return _next; } | |
526 | |
527 void set_next(HeapRegion* next) { _next = next; } | |
342 | 528 |
2152 | 529 // Every region added to a set is tagged with a reference to that |
530 // set. This is used for doing consistency checking to make sure that | |
531 // the contents of a set are as they should be and it's only | |
532 // available in non-product builds. | |
533 #ifdef ASSERT | |
534 void set_containing_set(HeapRegionSetBase* containing_set) { | |
535 assert((containing_set == NULL && _containing_set != NULL) || | |
536 (containing_set != NULL && _containing_set == NULL), | |
537 err_msg("containing_set: "PTR_FORMAT" " | |
538 "_containing_set: "PTR_FORMAT, | |
539 containing_set, _containing_set)); | |
540 | |
541 _containing_set = containing_set; | |
2361 | 542 } |
342 | 543 |
2152 | 544 HeapRegionSetBase* containing_set() { return _containing_set; } |
545 #else // ASSERT | |
546 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 547 |
2361 | 548 // containing_set() is only used in asserts so there's no reason |
2152 | 549 // to provide a dummy version of it. |
550 #endif // ASSERT | |
342 | 551 |
2152 | 552 // If we want to remove regions from a list in bulk we can simply tag |
553 // them with the pending_removal tag and call the | |
554 // remove_all_pending() method on the list. | |
342 | 555 |
2152 | 556 bool pending_removal() { return _pending_removal; } |
557 | |
558 void set_pending_removal(bool pending_removal) { | |
2361 | 559 if (pending_removal) { |
560 assert(!_pending_removal && containing_set() != NULL, | |
561 "can only set pending removal to true if it's false and " | |
562 "the region belongs to a region set"); | |
563 } else { | |
564 assert( _pending_removal && containing_set() == NULL, | |
565 "can only set pending removal to false if it's true and " | |
566 "the region does not belong to a region set"); | |
567 } | |
2152 | 568 |
569 _pending_removal = pending_removal; | |
342 | 570 } |
571 | |
572 HeapRegion* get_next_young_region() { return _next_young_region; } | |
573 void set_next_young_region(HeapRegion* hr) { | |
574 _next_young_region = hr; | |
575 } | |
576 | |
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577 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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578 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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579 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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580 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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581 |
342 | 582 // Allows logical separation between objects allocated before and after. |
583 void save_marks(); | |
584 | |
585 // Reset HR stuff to default values. | |
586 void hr_clear(bool par, bool clear_space); | |
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587 void par_clear(); |
342 | 588 |
356 | 589 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 590 |
591 // Get the start of the unmarked area in this region. | |
592 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
593 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
594 | |
595 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
596 // allocated in the current region before the last call to "save_mark". | |
597 void oop_before_save_marks_iterate(OopClosure* cl); | |
598 | |
599 // This call determines the "filter kind" argument that will be used for | |
600 // the next call to "new_dcto_cl" on this region with the "traditional" | |
601 // signature (i.e., the call below.) The default, in the absence of a | |
602 // preceding call to this method, is "NoFilterKind", and a call to this | |
603 // method is necessary for each such call, or else it reverts to the | |
604 // default. | |
605 // (This is really ugly, but all other methods I could think of changed a | |
606 // lot of main-line code for G1.) | |
607 void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { | |
608 _next_fk = nfk; | |
609 } | |
610 | |
611 DirtyCardToOopClosure* | |
612 new_dcto_closure(OopClosure* cl, | |
613 CardTableModRefBS::PrecisionStyle precision, | |
614 HeapRegionDCTOC::FilterKind fk); | |
615 | |
616 #if WHASSUP | |
617 DirtyCardToOopClosure* | |
618 new_dcto_closure(OopClosure* cl, | |
619 CardTableModRefBS::PrecisionStyle precision, | |
620 HeapWord* boundary) { | |
621 assert(boundary == NULL, "This arg doesn't make sense here."); | |
622 DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); | |
623 _next_fk = HeapRegionDCTOC::NoFilterKind; | |
624 return res; | |
625 } | |
626 #endif | |
627 | |
628 // | |
629 // Note the start or end of marking. This tells the heap region | |
630 // that the collector is about to start or has finished (concurrently) | |
631 // marking the heap. | |
632 // | |
633 | |
634 // Note the start of a marking phase. Record the | |
635 // start of the unmarked area of the region here. | |
636 void note_start_of_marking(bool during_initial_mark) { | |
637 init_top_at_conc_mark_count(); | |
638 _next_marked_bytes = 0; | |
639 if (during_initial_mark && is_young() && !is_survivor()) | |
640 _next_top_at_mark_start = bottom(); | |
641 else | |
642 _next_top_at_mark_start = top(); | |
643 } | |
644 | |
645 // Note the end of a marking phase. Install the start of | |
646 // the unmarked area that was captured at start of marking. | |
647 void note_end_of_marking() { | |
648 _prev_top_at_mark_start = _next_top_at_mark_start; | |
649 _prev_marked_bytes = _next_marked_bytes; | |
650 _next_marked_bytes = 0; | |
651 | |
652 guarantee(_prev_marked_bytes <= | |
653 (size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, | |
654 "invariant"); | |
655 } | |
656 | |
657 // After an evacuation, we need to update _next_top_at_mark_start | |
658 // to be the current top. Note this is only valid if we have only | |
659 // ever evacuated into this region. If we evacuate, allocate, and | |
660 // then evacuate we are in deep doodoo. | |
661 void note_end_of_copying() { | |
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662 assert(top() >= _next_top_at_mark_start, "Increase only"); |
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663 _next_top_at_mark_start = top(); |
342 | 664 } |
665 | |
666 // Returns "false" iff no object in the region was allocated when the | |
667 // last mark phase ended. | |
668 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
669 | |
670 // If "is_marked()" is true, then this is the index of the region in | |
671 // an array constructed at the end of marking of the regions in a | |
672 // "desirability" order. | |
673 int sort_index() { | |
674 return _sort_index; | |
675 } | |
676 void set_sort_index(int i) { | |
677 _sort_index = i; | |
678 } | |
679 | |
680 void init_top_at_conc_mark_count() { | |
681 _top_at_conc_mark_count = bottom(); | |
682 } | |
683 | |
684 void set_top_at_conc_mark_count(HeapWord *cur) { | |
685 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
686 _top_at_conc_mark_count = cur; | |
687 } | |
688 | |
689 HeapWord* top_at_conc_mark_count() { | |
690 return _top_at_conc_mark_count; | |
691 } | |
692 | |
693 void reset_during_compaction() { | |
694 guarantee( isHumongous() && startsHumongous(), | |
695 "should only be called for humongous regions"); | |
696 | |
697 zero_marked_bytes(); | |
698 init_top_at_mark_start(); | |
699 } | |
700 | |
701 // <PREDICTION> | |
702 void calc_gc_efficiency(void); | |
703 double gc_efficiency() { return _gc_efficiency;} | |
704 // </PREDICTION> | |
705 | |
706 bool is_young() const { return _young_type != NotYoung; } | |
707 bool is_survivor() const { return _young_type == Survivor; } | |
708 | |
709 int young_index_in_cset() const { return _young_index_in_cset; } | |
710 void set_young_index_in_cset(int index) { | |
711 assert( (index == -1) || is_young(), "pre-condition" ); | |
712 _young_index_in_cset = index; | |
713 } | |
714 | |
715 int age_in_surv_rate_group() { | |
716 assert( _surv_rate_group != NULL, "pre-condition" ); | |
717 assert( _age_index > -1, "pre-condition" ); | |
718 return _surv_rate_group->age_in_group(_age_index); | |
719 } | |
720 | |
721 void record_surv_words_in_group(size_t words_survived) { | |
722 assert( _surv_rate_group != NULL, "pre-condition" ); | |
723 assert( _age_index > -1, "pre-condition" ); | |
724 int age_in_group = age_in_surv_rate_group(); | |
725 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
726 } | |
727 | |
728 int age_in_surv_rate_group_cond() { | |
729 if (_surv_rate_group != NULL) | |
730 return age_in_surv_rate_group(); | |
731 else | |
732 return -1; | |
733 } | |
734 | |
735 SurvRateGroup* surv_rate_group() { | |
736 return _surv_rate_group; | |
737 } | |
738 | |
739 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
740 assert( surv_rate_group != NULL, "pre-condition" ); | |
741 assert( _surv_rate_group == NULL, "pre-condition" ); | |
742 assert( is_young(), "pre-condition" ); | |
743 | |
744 _surv_rate_group = surv_rate_group; | |
745 _age_index = surv_rate_group->next_age_index(); | |
746 } | |
747 | |
748 void uninstall_surv_rate_group() { | |
749 if (_surv_rate_group != NULL) { | |
750 assert( _age_index > -1, "pre-condition" ); | |
751 assert( is_young(), "pre-condition" ); | |
752 | |
753 _surv_rate_group = NULL; | |
754 _age_index = -1; | |
755 } else { | |
756 assert( _age_index == -1, "pre-condition" ); | |
757 } | |
758 } | |
759 | |
760 void set_young() { set_young_type(Young); } | |
761 | |
762 void set_survivor() { set_young_type(Survivor); } | |
763 | |
764 void set_not_young() { set_young_type(NotYoung); } | |
765 | |
766 // Determine if an object has been allocated since the last | |
767 // mark performed by the collector. This returns true iff the object | |
768 // is within the unmarked area of the region. | |
769 bool obj_allocated_since_prev_marking(oop obj) const { | |
770 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
771 } | |
772 bool obj_allocated_since_next_marking(oop obj) const { | |
773 return (HeapWord *) obj >= next_top_at_mark_start(); | |
774 } | |
775 | |
776 // For parallel heapRegion traversal. | |
777 bool claimHeapRegion(int claimValue); | |
778 jint claim_value() { return _claimed; } | |
779 // Use this carefully: only when you're sure no one is claiming... | |
780 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
781 | |
782 // Returns the "evacuation_failed" property of the region. | |
783 bool evacuation_failed() { return _evacuation_failed; } | |
784 | |
785 // Sets the "evacuation_failed" property of the region. | |
786 void set_evacuation_failed(bool b) { | |
787 _evacuation_failed = b; | |
788 | |
789 if (b) { | |
790 init_top_at_conc_mark_count(); | |
791 _next_marked_bytes = 0; | |
792 } | |
793 } | |
794 | |
795 // Requires that "mr" be entirely within the region. | |
796 // Apply "cl->do_object" to all objects that intersect with "mr". | |
797 // If the iteration encounters an unparseable portion of the region, | |
798 // or if "cl->abort()" is true after a closure application, | |
799 // terminate the iteration and return the address of the start of the | |
800 // subregion that isn't done. (The two can be distinguished by querying | |
801 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
802 // completed. | |
803 HeapWord* | |
804 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
805 | |
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806 // filter_young: if true and the region is a young region then we |
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807 // skip the iteration. |
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808 // card_ptr: if not NULL, and we decide that the card is not young |
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809 // and we iterate over it, we'll clean the card before we start the |
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810 // iteration. |
342 | 811 HeapWord* |
812 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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813 FilterOutOfRegionClosure* cl, |
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814 bool filter_young, |
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815 jbyte* card_ptr); |
342 | 816 |
817 // A version of block start that is guaranteed to find *some* block | |
818 // boundary at or before "p", but does not object iteration, and may | |
819 // therefore be used safely when the heap is unparseable. | |
820 HeapWord* block_start_careful(const void* p) const { | |
821 return _offsets.block_start_careful(p); | |
822 } | |
823 | |
824 // Requires that "addr" is within the region. Returns the start of the | |
825 // first ("careful") block that starts at or after "addr", or else the | |
826 // "end" of the region if there is no such block. | |
827 HeapWord* next_block_start_careful(HeapWord* addr); | |
828 | |
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829 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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830 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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831 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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832 |
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833 void set_recorded_rs_length(size_t rs_length) { |
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834 _recorded_rs_length = rs_length; |
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835 } |
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836 |
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837 void set_predicted_elapsed_time_ms(double ms) { |
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838 _predicted_elapsed_time_ms = ms; |
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839 } |
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840 |
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841 void set_predicted_bytes_to_copy(size_t bytes) { |
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842 _predicted_bytes_to_copy = bytes; |
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843 } |
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844 |
342 | 845 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
846 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
847 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
848 | |
849 CompactibleSpace* next_compaction_space() const; | |
850 | |
851 virtual void reset_after_compaction(); | |
852 | |
853 void print() const; | |
854 void print_on(outputStream* st) const; | |
855 | |
811 | 856 // use_prev_marking == true -> use "prev" marking information, |
857 // use_prev_marking == false -> use "next" marking information | |
858 // NOTE: Only the "prev" marking information is guaranteed to be | |
859 // consistent most of the time, so most calls to this should use | |
860 // use_prev_marking == true. Currently, there is only one case where | |
861 // this is called with use_prev_marking == false, which is to verify | |
862 // the "next" marking information at the end of remark. | |
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863 void verify(bool allow_dirty, bool use_prev_marking, bool *failures) const; |
811 | 864 |
865 // Override; it uses the "prev" marking information | |
342 | 866 virtual void verify(bool allow_dirty) const; |
867 }; | |
868 | |
869 // HeapRegionClosure is used for iterating over regions. | |
870 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
871 class HeapRegionClosure : public StackObj { | |
872 friend class HeapRegionSeq; | |
873 friend class G1CollectedHeap; | |
874 | |
875 bool _complete; | |
876 void incomplete() { _complete = false; } | |
877 | |
878 public: | |
879 HeapRegionClosure(): _complete(true) {} | |
880 | |
881 // Typically called on each region until it returns true. | |
882 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
883 | |
884 // True after iteration if the closure was applied to all heap regions | |
885 // and returned "false" in all cases. | |
886 bool complete() { return _complete; } | |
887 }; | |
888 | |
889 #endif // SERIALGC | |
1972 | 890 |
891 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |