Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp @ 10285:4868caa99ecf
8014339: Improve assert and remove some dead code from parMarkBitMap.hpp/cpp
Reviewed-by: stefank, tschatzl
author | brutisso |
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date | Mon, 13 May 2013 14:09:05 +0200 |
parents | 7b835924c31c |
children | 10f759898d40 |
rev | line source |
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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" |
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29 #include "oops/oop.hpp" |
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30 #include "utilities/bitMap.hpp" |
1972 | 31 |
0 | 32 class ParMarkBitMapClosure; |
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33 class PSVirtualSpace; |
0 | 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 bool initialize(MemRegion covered_region); | |
45 | |
46 // Atomically mark an object as live. | |
47 bool mark_obj(HeapWord* addr, size_t size); | |
48 inline bool mark_obj(oop obj, int size); | |
49 | |
50 // Return whether the specified begin or end bit is set. | |
51 inline bool is_obj_beg(idx_t bit) const; | |
52 inline bool is_obj_end(idx_t bit) const; | |
53 | |
54 // Traditional interface for testing whether an object is marked or not (these | |
55 // test only the begin bits). | |
56 inline bool is_marked(idx_t bit) const; | |
57 inline bool is_marked(HeapWord* addr) const; | |
58 inline bool is_marked(oop obj) const; | |
59 | |
60 inline bool is_unmarked(idx_t bit) const; | |
61 inline bool is_unmarked(HeapWord* addr) const; | |
62 inline bool is_unmarked(oop obj) const; | |
63 | |
64 // Convert sizes from bits to HeapWords and back. An object that is n bits | |
65 // long will be bits_to_words(n) words long. An object that is m words long | |
66 // will take up words_to_bits(m) bits in the bitmap. | |
67 inline static size_t bits_to_words(idx_t bits); | |
68 inline static idx_t words_to_bits(size_t words); | |
69 | |
70 // Return the size in words of an object given a begin bit and an end bit, or | |
71 // the equivalent beg_addr and end_addr. | |
72 inline size_t obj_size(idx_t beg_bit, idx_t end_bit) const; | |
73 inline size_t obj_size(HeapWord* beg_addr, HeapWord* end_addr) const; | |
74 | |
75 // Return the size in words of the object (a search is done for the end bit). | |
76 inline size_t obj_size(idx_t beg_bit) const; | |
77 inline size_t obj_size(HeapWord* addr) const; | |
78 | |
79 // Apply live_closure to each live object that lies completely within the | |
80 // range [live_range_beg, live_range_end). This is used to iterate over the | |
81 // compacted region of the heap. Return values: | |
82 // | |
83 // incomplete The iteration is not complete. The last object that | |
84 // begins in the range does not end in the range; | |
85 // closure->source() is set to the start of that object. | |
86 // | |
87 // complete The iteration is complete. All objects in the range | |
88 // were processed and the closure is not full; | |
89 // closure->source() is set one past the end of the range. | |
90 // | |
91 // full The closure is full; closure->source() is set to one | |
92 // past the end of the last object processed. | |
93 // | |
94 // would_overflow The next object in the range would overflow the closure; | |
95 // closure->source() is set to the start of that object. | |
96 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
97 idx_t range_beg, idx_t range_end) const; | |
98 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
99 HeapWord* range_beg, | |
100 HeapWord* range_end) const; | |
101 | |
102 // Apply live closure as above and additionally apply dead_closure to all dead | |
103 // space in the range [range_beg, dead_range_end). Note that dead_range_end | |
104 // must be >= range_end. This is used to iterate over the dense prefix. | |
105 // | |
106 // This method assumes that if the first bit in the range (range_beg) is not | |
107 // marked, then dead space begins at that point and the dead_closure is | |
108 // applied. Thus callers must ensure that range_beg is not in the middle of a | |
109 // live object. | |
110 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
111 ParMarkBitMapClosure* dead_closure, | |
112 idx_t range_beg, idx_t range_end, | |
113 idx_t dead_range_end) const; | |
114 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
115 ParMarkBitMapClosure* dead_closure, | |
116 HeapWord* range_beg, | |
117 HeapWord* range_end, | |
118 HeapWord* dead_range_end) const; | |
119 | |
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120 // Return the number of live words in the range [beg_addr, end_obj) due to |
0 | 121 // objects that start in the range. If a live object extends onto the range, |
122 // the caller must detect and account for any live words due to that object. | |
123 // If a live object extends beyond the end of the range, only the words within | |
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124 // the range are included in the result. The end of the range must be a live object, |
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125 // which is the case when updating pointers. This allows a branch to be removed |
0 | 126 // from inside the loop. |
127 size_t live_words_in_range(HeapWord* beg_addr, oop end_obj) const; | |
128 | |
129 inline HeapWord* region_start() const; | |
130 inline HeapWord* region_end() const; | |
131 inline size_t region_size() const; | |
132 inline size_t size() const; | |
133 | |
134 // Convert a heap address to/from a bit index. | |
135 inline idx_t addr_to_bit(HeapWord* addr) const; | |
136 inline HeapWord* bit_to_addr(idx_t bit) const; | |
137 | |
138 // Return the bit index of the first marked object that begins (or ends, | |
139 // respectively) in the range [beg, end). If no object is found, return end. | |
140 inline idx_t find_obj_beg(idx_t beg, idx_t end) const; | |
141 inline idx_t find_obj_end(idx_t beg, idx_t end) const; | |
142 | |
143 inline HeapWord* find_obj_beg(HeapWord* beg, HeapWord* end) const; | |
144 inline HeapWord* find_obj_end(HeapWord* beg, HeapWord* end) const; | |
145 | |
146 // Clear a range of bits or the entire bitmap (both begin and end bits are | |
147 // cleared). | |
148 inline void clear_range(idx_t beg, idx_t end); | |
149 | |
150 // Return the number of bits required to represent the specified number of | |
151 // HeapWords, or the specified region. | |
152 static inline idx_t bits_required(size_t words); | |
153 static inline idx_t bits_required(MemRegion covered_region); | |
154 | |
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155 void print_on_error(outputStream* st) const { |
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156 st->print_cr("Marking Bits: (ParMarkBitMap*) " PTR_FORMAT, this); |
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157 _beg_bits.print_on_error(st, " Begin Bits: "); |
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158 _end_bits.print_on_error(st, " End Bits: "); |
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159 } |
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160 |
0 | 161 #ifdef ASSERT |
162 void verify_clear() const; | |
163 inline void verify_bit(idx_t bit) const; | |
164 inline void verify_addr(HeapWord* addr) const; | |
165 #endif // #ifdef ASSERT | |
166 | |
167 private: | |
168 // Each bit in the bitmap represents one unit of 'object granularity.' Objects | |
169 // are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit | |
170 // granularity is 2, 64-bit is 1. | |
171 static inline size_t obj_granularity() { return size_t(MinObjAlignment); } | |
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172 static inline int obj_granularity_shift() { return LogMinObjAlignment; } |
0 | 173 |
174 HeapWord* _region_start; | |
175 size_t _region_size; | |
176 BitMap _beg_bits; | |
177 BitMap _end_bits; | |
178 PSVirtualSpace* _virtual_space; | |
179 }; | |
180 | |
181 inline ParMarkBitMap::ParMarkBitMap(): | |
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182 _beg_bits(), _end_bits(), _region_start(NULL), _region_size(0), _virtual_space(NULL) |
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183 { } |
0 | 184 |
185 inline void ParMarkBitMap::clear_range(idx_t beg, idx_t end) | |
186 { | |
187 _beg_bits.clear_range(beg, end); | |
188 _end_bits.clear_range(beg, end); | |
189 } | |
190 | |
191 inline ParMarkBitMap::idx_t | |
192 ParMarkBitMap::bits_required(size_t words) | |
193 { | |
194 // Need two bits (one begin bit, one end bit) for each unit of 'object | |
195 // granularity' in the heap. | |
196 return words_to_bits(words * 2); | |
197 } | |
198 | |
199 inline ParMarkBitMap::idx_t | |
200 ParMarkBitMap::bits_required(MemRegion covered_region) | |
201 { | |
202 return bits_required(covered_region.word_size()); | |
203 } | |
204 | |
205 inline HeapWord* | |
206 ParMarkBitMap::region_start() const | |
207 { | |
208 return _region_start; | |
209 } | |
210 | |
211 inline HeapWord* | |
212 ParMarkBitMap::region_end() const | |
213 { | |
214 return region_start() + region_size(); | |
215 } | |
216 | |
217 inline size_t | |
218 ParMarkBitMap::region_size() const | |
219 { | |
220 return _region_size; | |
221 } | |
222 | |
223 inline size_t | |
224 ParMarkBitMap::size() const | |
225 { | |
226 return _beg_bits.size(); | |
227 } | |
228 | |
229 inline bool ParMarkBitMap::is_obj_beg(idx_t bit) const | |
230 { | |
231 return _beg_bits.at(bit); | |
232 } | |
233 | |
234 inline bool ParMarkBitMap::is_obj_end(idx_t bit) const | |
235 { | |
236 return _end_bits.at(bit); | |
237 } | |
238 | |
239 inline bool ParMarkBitMap::is_marked(idx_t bit) const | |
240 { | |
241 return is_obj_beg(bit); | |
242 } | |
243 | |
244 inline bool ParMarkBitMap::is_marked(HeapWord* addr) const | |
245 { | |
246 return is_marked(addr_to_bit(addr)); | |
247 } | |
248 | |
249 inline bool ParMarkBitMap::is_marked(oop obj) const | |
250 { | |
251 return is_marked((HeapWord*)obj); | |
252 } | |
253 | |
254 inline bool ParMarkBitMap::is_unmarked(idx_t bit) const | |
255 { | |
256 return !is_marked(bit); | |
257 } | |
258 | |
259 inline bool ParMarkBitMap::is_unmarked(HeapWord* addr) const | |
260 { | |
261 return !is_marked(addr); | |
262 } | |
263 | |
264 inline bool ParMarkBitMap::is_unmarked(oop obj) const | |
265 { | |
266 return !is_marked(obj); | |
267 } | |
268 | |
269 inline size_t | |
270 ParMarkBitMap::bits_to_words(idx_t bits) | |
271 { | |
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272 return bits << obj_granularity_shift(); |
0 | 273 } |
274 | |
275 inline ParMarkBitMap::idx_t | |
276 ParMarkBitMap::words_to_bits(size_t words) | |
277 { | |
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278 return words >> obj_granularity_shift(); |
0 | 279 } |
280 | |
281 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const | |
282 { | |
283 DEBUG_ONLY(verify_bit(beg_bit);) | |
284 DEBUG_ONLY(verify_bit(end_bit);) | |
285 return bits_to_words(end_bit - beg_bit + 1); | |
286 } | |
287 | |
288 inline size_t | |
289 ParMarkBitMap::obj_size(HeapWord* beg_addr, HeapWord* end_addr) const | |
290 { | |
291 DEBUG_ONLY(verify_addr(beg_addr);) | |
292 DEBUG_ONLY(verify_addr(end_addr);) | |
293 return pointer_delta(end_addr, beg_addr) + obj_granularity(); | |
294 } | |
295 | |
296 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit) const | |
297 { | |
342 | 298 const idx_t end_bit = _end_bits.get_next_one_offset_inline(beg_bit, size()); |
0 | 299 assert(is_marked(beg_bit), "obj not marked"); |
300 assert(end_bit < size(), "end bit missing"); | |
301 return obj_size(beg_bit, end_bit); | |
302 } | |
303 | |
304 inline size_t ParMarkBitMap::obj_size(HeapWord* addr) const | |
305 { | |
306 return obj_size(addr_to_bit(addr)); | |
307 } | |
308 | |
309 inline ParMarkBitMap::IterationStatus | |
310 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
311 HeapWord* range_beg, | |
312 HeapWord* range_end) const | |
313 { | |
314 return iterate(live_closure, addr_to_bit(range_beg), addr_to_bit(range_end)); | |
315 } | |
316 | |
317 inline ParMarkBitMap::IterationStatus | |
318 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
319 ParMarkBitMapClosure* dead_closure, | |
320 HeapWord* range_beg, | |
321 HeapWord* range_end, | |
322 HeapWord* dead_range_end) const | |
323 { | |
324 return iterate(live_closure, dead_closure, | |
325 addr_to_bit(range_beg), addr_to_bit(range_end), | |
326 addr_to_bit(dead_range_end)); | |
327 } | |
328 | |
329 inline bool | |
330 ParMarkBitMap::mark_obj(oop obj, int size) | |
331 { | |
332 return mark_obj((HeapWord*)obj, (size_t)size); | |
333 } | |
334 | |
335 inline BitMap::idx_t | |
336 ParMarkBitMap::addr_to_bit(HeapWord* addr) const | |
337 { | |
338 DEBUG_ONLY(verify_addr(addr);) | |
339 return words_to_bits(pointer_delta(addr, region_start())); | |
340 } | |
341 | |
342 inline HeapWord* | |
343 ParMarkBitMap::bit_to_addr(idx_t bit) const | |
344 { | |
345 DEBUG_ONLY(verify_bit(bit);) | |
346 return region_start() + bits_to_words(bit); | |
347 } | |
348 | |
349 inline ParMarkBitMap::idx_t | |
350 ParMarkBitMap::find_obj_beg(idx_t beg, idx_t end) const | |
351 { | |
342 | 352 return _beg_bits.get_next_one_offset_inline_aligned_right(beg, end); |
0 | 353 } |
354 | |
355 inline ParMarkBitMap::idx_t | |
356 ParMarkBitMap::find_obj_end(idx_t beg, idx_t end) const | |
357 { | |
342 | 358 return _end_bits.get_next_one_offset_inline_aligned_right(beg, end); |
0 | 359 } |
360 | |
361 inline HeapWord* | |
362 ParMarkBitMap::find_obj_beg(HeapWord* beg, HeapWord* end) const | |
363 { | |
364 const idx_t beg_bit = addr_to_bit(beg); | |
365 const idx_t end_bit = addr_to_bit(end); | |
366 const idx_t search_end = BitMap::word_align_up(end_bit); | |
367 const idx_t res_bit = MIN2(find_obj_beg(beg_bit, search_end), end_bit); | |
368 return bit_to_addr(res_bit); | |
369 } | |
370 | |
371 inline HeapWord* | |
372 ParMarkBitMap::find_obj_end(HeapWord* beg, HeapWord* end) const | |
373 { | |
374 const idx_t beg_bit = addr_to_bit(beg); | |
375 const idx_t end_bit = addr_to_bit(end); | |
376 const idx_t search_end = BitMap::word_align_up(end_bit); | |
377 const idx_t res_bit = MIN2(find_obj_end(beg_bit, search_end), end_bit); | |
378 return bit_to_addr(res_bit); | |
379 } | |
380 | |
381 #ifdef ASSERT | |
382 inline void ParMarkBitMap::verify_bit(idx_t bit) const { | |
383 // Allow one past the last valid bit; useful for loop bounds. | |
384 assert(bit <= _beg_bits.size(), "bit out of range"); | |
385 } | |
386 | |
387 inline void ParMarkBitMap::verify_addr(HeapWord* addr) const { | |
388 // Allow one past the last valid address; useful for loop bounds. | |
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389 assert(addr >= region_start(), |
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390 err_msg("addr too small, addr: " PTR_FORMAT " region start: " PTR_FORMAT, addr, region_start())); |
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391 assert(addr <= region_end(), |
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392 err_msg("addr too big, addr: " PTR_FORMAT " region end: " PTR_FORMAT, addr, region_end())); |
0 | 393 } |
394 #endif // #ifdef ASSERT | |
1972 | 395 |
396 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP |