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annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp @ 10180:ebded0261dfc
8012111: Remove warning about CMS generation shrinking.
Reviewed-by: johnc, brutisso, stefank
author | jmasa |
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date | Mon, 22 Apr 2013 22:00:03 -0700 |
parents | 7b835924c31c |
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0 | 1 /* |
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2 * Copyright (c) 2005, 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_PARALLELSCAVENGE_PARMARKBITMAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP | |
27 | |
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28 #include "memory/memRegion.hpp" |
1972 | 29 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" |
30 #include "utilities/bitMap.inline.hpp" | |
31 | |
0 | 32 class oopDesc; |
33 class ParMarkBitMapClosure; | |
34 | |
6197 | 35 class ParMarkBitMap: public CHeapObj<mtGC> |
0 | 36 { |
37 public: | |
38 typedef BitMap::idx_t idx_t; | |
39 | |
40 // Values returned by the iterate() methods. | |
41 enum IterationStatus { incomplete, complete, full, would_overflow }; | |
42 | |
43 inline ParMarkBitMap(); | |
44 inline ParMarkBitMap(MemRegion covered_region); | |
45 bool initialize(MemRegion covered_region); | |
46 | |
47 // Atomically mark an object as live. | |
48 bool mark_obj(HeapWord* addr, size_t size); | |
49 inline bool mark_obj(oop obj, int size); | |
50 inline bool mark_obj(oop obj); | |
51 | |
52 // Return whether the specified begin or end bit is set. | |
53 inline bool is_obj_beg(idx_t bit) const; | |
54 inline bool is_obj_end(idx_t bit) const; | |
55 | |
56 // Traditional interface for testing whether an object is marked or not (these | |
57 // test only the begin bits). | |
58 inline bool is_marked(idx_t bit) const; | |
59 inline bool is_marked(HeapWord* addr) const; | |
60 inline bool is_marked(oop obj) const; | |
61 | |
62 inline bool is_unmarked(idx_t bit) const; | |
63 inline bool is_unmarked(HeapWord* addr) const; | |
64 inline bool is_unmarked(oop obj) const; | |
65 | |
66 // Convert sizes from bits to HeapWords and back. An object that is n bits | |
67 // long will be bits_to_words(n) words long. An object that is m words long | |
68 // will take up words_to_bits(m) bits in the bitmap. | |
69 inline static size_t bits_to_words(idx_t bits); | |
70 inline static idx_t words_to_bits(size_t words); | |
71 | |
72 // Return the size in words of an object given a begin bit and an end bit, or | |
73 // the equivalent beg_addr and end_addr. | |
74 inline size_t obj_size(idx_t beg_bit, idx_t end_bit) const; | |
75 inline size_t obj_size(HeapWord* beg_addr, HeapWord* end_addr) const; | |
76 | |
77 // Return the size in words of the object (a search is done for the end bit). | |
78 inline size_t obj_size(idx_t beg_bit) const; | |
79 inline size_t obj_size(HeapWord* addr) const; | |
80 inline size_t obj_size(oop obj) const; | |
81 | |
82 // Synonyms for the above. | |
83 size_t obj_size_in_words(oop obj) const { return obj_size((HeapWord*)obj); } | |
84 size_t obj_size_in_words(HeapWord* addr) const { return obj_size(addr); } | |
85 | |
86 // Apply live_closure to each live object that lies completely within the | |
87 // range [live_range_beg, live_range_end). This is used to iterate over the | |
88 // compacted region of the heap. Return values: | |
89 // | |
90 // incomplete The iteration is not complete. The last object that | |
91 // begins in the range does not end in the range; | |
92 // closure->source() is set to the start of that object. | |
93 // | |
94 // complete The iteration is complete. All objects in the range | |
95 // were processed and the closure is not full; | |
96 // closure->source() is set one past the end of the range. | |
97 // | |
98 // full The closure is full; closure->source() is set to one | |
99 // past the end of the last object processed. | |
100 // | |
101 // would_overflow The next object in the range would overflow the closure; | |
102 // closure->source() is set to the start of that object. | |
103 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
104 idx_t range_beg, idx_t range_end) const; | |
105 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
106 HeapWord* range_beg, | |
107 HeapWord* range_end) const; | |
108 | |
109 // Apply live closure as above and additionally apply dead_closure to all dead | |
110 // space in the range [range_beg, dead_range_end). Note that dead_range_end | |
111 // must be >= range_end. This is used to iterate over the dense prefix. | |
112 // | |
113 // This method assumes that if the first bit in the range (range_beg) is not | |
114 // marked, then dead space begins at that point and the dead_closure is | |
115 // applied. Thus callers must ensure that range_beg is not in the middle of a | |
116 // live object. | |
117 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
118 ParMarkBitMapClosure* dead_closure, | |
119 idx_t range_beg, idx_t range_end, | |
120 idx_t dead_range_end) const; | |
121 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
122 ParMarkBitMapClosure* dead_closure, | |
123 HeapWord* range_beg, | |
124 HeapWord* range_end, | |
125 HeapWord* dead_range_end) const; | |
126 | |
127 // Return the number of live words in the range [beg_addr, end_addr) due to | |
128 // objects that start in the range. If a live object extends onto the range, | |
129 // the caller must detect and account for any live words due to that object. | |
130 // If a live object extends beyond the end of the range, only the words within | |
131 // the range are included in the result. | |
132 size_t live_words_in_range(HeapWord* beg_addr, HeapWord* end_addr) const; | |
133 | |
134 // Same as the above, except the end of the range must be a live object, which | |
135 // is the case when updating pointers. This allows a branch to be removed | |
136 // from inside the loop. | |
137 size_t live_words_in_range(HeapWord* beg_addr, oop end_obj) const; | |
138 | |
139 inline HeapWord* region_start() const; | |
140 inline HeapWord* region_end() const; | |
141 inline size_t region_size() const; | |
142 inline size_t size() const; | |
143 | |
144 // Convert a heap address to/from a bit index. | |
145 inline idx_t addr_to_bit(HeapWord* addr) const; | |
146 inline HeapWord* bit_to_addr(idx_t bit) const; | |
147 | |
148 // Return the bit index of the first marked object that begins (or ends, | |
149 // respectively) in the range [beg, end). If no object is found, return end. | |
150 inline idx_t find_obj_beg(idx_t beg, idx_t end) const; | |
151 inline idx_t find_obj_end(idx_t beg, idx_t end) const; | |
152 | |
153 inline HeapWord* find_obj_beg(HeapWord* beg, HeapWord* end) const; | |
154 inline HeapWord* find_obj_end(HeapWord* beg, HeapWord* end) const; | |
155 | |
156 // Clear a range of bits or the entire bitmap (both begin and end bits are | |
157 // cleared). | |
158 inline void clear_range(idx_t beg, idx_t end); | |
159 inline void clear() { clear_range(0, size()); } | |
160 | |
161 // Return the number of bits required to represent the specified number of | |
162 // HeapWords, or the specified region. | |
163 static inline idx_t bits_required(size_t words); | |
164 static inline idx_t bits_required(MemRegion covered_region); | |
165 static inline idx_t words_required(MemRegion covered_region); | |
166 | |
167 #ifndef PRODUCT | |
168 // CAS statistics. | |
169 size_t cas_tries() { return _cas_tries; } | |
170 size_t cas_retries() { return _cas_retries; } | |
171 size_t cas_by_another() { return _cas_by_another; } | |
172 | |
173 void reset_counters(); | |
174 #endif // #ifndef PRODUCT | |
175 | |
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176 void print_on_error(outputStream* st) const { |
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177 st->print_cr("Marking Bits: (ParMarkBitMap*) " PTR_FORMAT, this); |
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178 _beg_bits.print_on_error(st, " Begin Bits: "); |
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179 _end_bits.print_on_error(st, " End Bits: "); |
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180 } |
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181 |
0 | 182 #ifdef ASSERT |
183 void verify_clear() const; | |
184 inline void verify_bit(idx_t bit) const; | |
185 inline void verify_addr(HeapWord* addr) const; | |
186 #endif // #ifdef ASSERT | |
187 | |
188 private: | |
189 // Each bit in the bitmap represents one unit of 'object granularity.' Objects | |
190 // are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit | |
191 // granularity is 2, 64-bit is 1. | |
192 static inline size_t obj_granularity() { return size_t(MinObjAlignment); } | |
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193 static inline int obj_granularity_shift() { return LogMinObjAlignment; } |
0 | 194 |
195 HeapWord* _region_start; | |
196 size_t _region_size; | |
197 BitMap _beg_bits; | |
198 BitMap _end_bits; | |
199 PSVirtualSpace* _virtual_space; | |
200 | |
201 #ifndef PRODUCT | |
202 size_t _cas_tries; | |
203 size_t _cas_retries; | |
204 size_t _cas_by_another; | |
205 #endif // #ifndef PRODUCT | |
206 }; | |
207 | |
208 inline ParMarkBitMap::ParMarkBitMap(): | |
342 | 209 _beg_bits(), |
210 _end_bits() | |
0 | 211 { |
212 _region_start = 0; | |
213 _virtual_space = 0; | |
214 } | |
215 | |
216 inline ParMarkBitMap::ParMarkBitMap(MemRegion covered_region): | |
342 | 217 _beg_bits(), |
218 _end_bits() | |
0 | 219 { |
220 initialize(covered_region); | |
221 } | |
222 | |
223 inline void ParMarkBitMap::clear_range(idx_t beg, idx_t end) | |
224 { | |
225 _beg_bits.clear_range(beg, end); | |
226 _end_bits.clear_range(beg, end); | |
227 } | |
228 | |
229 inline ParMarkBitMap::idx_t | |
230 ParMarkBitMap::bits_required(size_t words) | |
231 { | |
232 // Need two bits (one begin bit, one end bit) for each unit of 'object | |
233 // granularity' in the heap. | |
234 return words_to_bits(words * 2); | |
235 } | |
236 | |
237 inline ParMarkBitMap::idx_t | |
238 ParMarkBitMap::bits_required(MemRegion covered_region) | |
239 { | |
240 return bits_required(covered_region.word_size()); | |
241 } | |
242 | |
243 inline ParMarkBitMap::idx_t | |
244 ParMarkBitMap::words_required(MemRegion covered_region) | |
245 { | |
246 return bits_required(covered_region) / BitsPerWord; | |
247 } | |
248 | |
249 inline HeapWord* | |
250 ParMarkBitMap::region_start() const | |
251 { | |
252 return _region_start; | |
253 } | |
254 | |
255 inline HeapWord* | |
256 ParMarkBitMap::region_end() const | |
257 { | |
258 return region_start() + region_size(); | |
259 } | |
260 | |
261 inline size_t | |
262 ParMarkBitMap::region_size() const | |
263 { | |
264 return _region_size; | |
265 } | |
266 | |
267 inline size_t | |
268 ParMarkBitMap::size() const | |
269 { | |
270 return _beg_bits.size(); | |
271 } | |
272 | |
273 inline bool ParMarkBitMap::is_obj_beg(idx_t bit) const | |
274 { | |
275 return _beg_bits.at(bit); | |
276 } | |
277 | |
278 inline bool ParMarkBitMap::is_obj_end(idx_t bit) const | |
279 { | |
280 return _end_bits.at(bit); | |
281 } | |
282 | |
283 inline bool ParMarkBitMap::is_marked(idx_t bit) const | |
284 { | |
285 return is_obj_beg(bit); | |
286 } | |
287 | |
288 inline bool ParMarkBitMap::is_marked(HeapWord* addr) const | |
289 { | |
290 return is_marked(addr_to_bit(addr)); | |
291 } | |
292 | |
293 inline bool ParMarkBitMap::is_marked(oop obj) const | |
294 { | |
295 return is_marked((HeapWord*)obj); | |
296 } | |
297 | |
298 inline bool ParMarkBitMap::is_unmarked(idx_t bit) const | |
299 { | |
300 return !is_marked(bit); | |
301 } | |
302 | |
303 inline bool ParMarkBitMap::is_unmarked(HeapWord* addr) const | |
304 { | |
305 return !is_marked(addr); | |
306 } | |
307 | |
308 inline bool ParMarkBitMap::is_unmarked(oop obj) const | |
309 { | |
310 return !is_marked(obj); | |
311 } | |
312 | |
313 inline size_t | |
314 ParMarkBitMap::bits_to_words(idx_t bits) | |
315 { | |
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316 return bits << obj_granularity_shift(); |
0 | 317 } |
318 | |
319 inline ParMarkBitMap::idx_t | |
320 ParMarkBitMap::words_to_bits(size_t words) | |
321 { | |
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322 return words >> obj_granularity_shift(); |
0 | 323 } |
324 | |
325 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const | |
326 { | |
327 DEBUG_ONLY(verify_bit(beg_bit);) | |
328 DEBUG_ONLY(verify_bit(end_bit);) | |
329 return bits_to_words(end_bit - beg_bit + 1); | |
330 } | |
331 | |
332 inline size_t | |
333 ParMarkBitMap::obj_size(HeapWord* beg_addr, HeapWord* end_addr) const | |
334 { | |
335 DEBUG_ONLY(verify_addr(beg_addr);) | |
336 DEBUG_ONLY(verify_addr(end_addr);) | |
337 return pointer_delta(end_addr, beg_addr) + obj_granularity(); | |
338 } | |
339 | |
340 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit) const | |
341 { | |
342 | 342 const idx_t end_bit = _end_bits.get_next_one_offset_inline(beg_bit, size()); |
0 | 343 assert(is_marked(beg_bit), "obj not marked"); |
344 assert(end_bit < size(), "end bit missing"); | |
345 return obj_size(beg_bit, end_bit); | |
346 } | |
347 | |
348 inline size_t ParMarkBitMap::obj_size(HeapWord* addr) const | |
349 { | |
350 return obj_size(addr_to_bit(addr)); | |
351 } | |
352 | |
353 inline size_t ParMarkBitMap::obj_size(oop obj) const | |
354 { | |
355 return obj_size((HeapWord*)obj); | |
356 } | |
357 | |
358 inline ParMarkBitMap::IterationStatus | |
359 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
360 HeapWord* range_beg, | |
361 HeapWord* range_end) const | |
362 { | |
363 return iterate(live_closure, addr_to_bit(range_beg), addr_to_bit(range_end)); | |
364 } | |
365 | |
366 inline ParMarkBitMap::IterationStatus | |
367 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
368 ParMarkBitMapClosure* dead_closure, | |
369 HeapWord* range_beg, | |
370 HeapWord* range_end, | |
371 HeapWord* dead_range_end) const | |
372 { | |
373 return iterate(live_closure, dead_closure, | |
374 addr_to_bit(range_beg), addr_to_bit(range_end), | |
375 addr_to_bit(dead_range_end)); | |
376 } | |
377 | |
378 inline bool | |
379 ParMarkBitMap::mark_obj(oop obj, int size) | |
380 { | |
381 return mark_obj((HeapWord*)obj, (size_t)size); | |
382 } | |
383 | |
384 inline BitMap::idx_t | |
385 ParMarkBitMap::addr_to_bit(HeapWord* addr) const | |
386 { | |
387 DEBUG_ONLY(verify_addr(addr);) | |
388 return words_to_bits(pointer_delta(addr, region_start())); | |
389 } | |
390 | |
391 inline HeapWord* | |
392 ParMarkBitMap::bit_to_addr(idx_t bit) const | |
393 { | |
394 DEBUG_ONLY(verify_bit(bit);) | |
395 return region_start() + bits_to_words(bit); | |
396 } | |
397 | |
398 inline ParMarkBitMap::idx_t | |
399 ParMarkBitMap::find_obj_beg(idx_t beg, idx_t end) const | |
400 { | |
342 | 401 return _beg_bits.get_next_one_offset_inline_aligned_right(beg, end); |
0 | 402 } |
403 | |
404 inline ParMarkBitMap::idx_t | |
405 ParMarkBitMap::find_obj_end(idx_t beg, idx_t end) const | |
406 { | |
342 | 407 return _end_bits.get_next_one_offset_inline_aligned_right(beg, end); |
0 | 408 } |
409 | |
410 inline HeapWord* | |
411 ParMarkBitMap::find_obj_beg(HeapWord* beg, HeapWord* end) const | |
412 { | |
413 const idx_t beg_bit = addr_to_bit(beg); | |
414 const idx_t end_bit = addr_to_bit(end); | |
415 const idx_t search_end = BitMap::word_align_up(end_bit); | |
416 const idx_t res_bit = MIN2(find_obj_beg(beg_bit, search_end), end_bit); | |
417 return bit_to_addr(res_bit); | |
418 } | |
419 | |
420 inline HeapWord* | |
421 ParMarkBitMap::find_obj_end(HeapWord* beg, HeapWord* end) const | |
422 { | |
423 const idx_t beg_bit = addr_to_bit(beg); | |
424 const idx_t end_bit = addr_to_bit(end); | |
425 const idx_t search_end = BitMap::word_align_up(end_bit); | |
426 const idx_t res_bit = MIN2(find_obj_end(beg_bit, search_end), end_bit); | |
427 return bit_to_addr(res_bit); | |
428 } | |
429 | |
430 #ifdef ASSERT | |
431 inline void ParMarkBitMap::verify_bit(idx_t bit) const { | |
432 // Allow one past the last valid bit; useful for loop bounds. | |
433 assert(bit <= _beg_bits.size(), "bit out of range"); | |
434 } | |
435 | |
436 inline void ParMarkBitMap::verify_addr(HeapWord* addr) const { | |
437 // Allow one past the last valid address; useful for loop bounds. | |
438 assert(addr >= region_start(), "addr too small"); | |
439 assert(addr <= region_start() + region_size(), "addr too big"); | |
440 } | |
441 #endif // #ifdef ASSERT | |
1972 | 442 |
443 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP |