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annotate src/share/vm/memory/cardTableModRefBS.hpp @ 17510:7e412f95e310
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author | amurillo |
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date | Thu, 23 Jan 2014 13:53:23 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, 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_MEMORY_CARDTABLEMODREFBS_HPP |
26 #define SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP | |
27 | |
28 #include "memory/modRefBarrierSet.hpp" | |
29 #include "oops/oop.hpp" | |
30 #include "oops/oop.inline2.hpp" | |
31 | |
0 | 32 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
33 // enumerate ref fields that have been modified (since the last | |
34 // enumeration.) | |
35 | |
36 // As it currently stands, this barrier is *imprecise*: when a ref field in | |
37 // an object "o" is modified, the card table entry for the card containing | |
38 // the head of "o" is dirtied, not necessarily the card containing the | |
39 // modified field itself. For object arrays, however, the barrier *is* | |
40 // precise; only the card containing the modified element is dirtied. | |
41 // Any MemRegionClosures used to scan dirty cards should take these | |
42 // considerations into account. | |
43 | |
44 class Generation; | |
45 class OopsInGenClosure; | |
46 class DirtyCardToOopClosure; | |
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47 class ClearNoncleanCardWrapper; |
0 | 48 |
49 class CardTableModRefBS: public ModRefBarrierSet { | |
50 // Some classes get to look at some private stuff. | |
51 friend class BytecodeInterpreter; | |
52 friend class VMStructs; | |
53 friend class CardTableRS; | |
54 friend class CheckForUnmarkedOops; // Needs access to raw card bytes. | |
1692 | 55 friend class SharkBuilder; |
0 | 56 #ifndef PRODUCT |
57 // For debugging. | |
58 friend class GuaranteeNotModClosure; | |
59 #endif | |
60 protected: | |
61 | |
62 enum CardValues { | |
63 clean_card = -1, | |
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64 // The mask contains zeros in places for all other values. |
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65 clean_card_mask = clean_card - 31, |
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66 |
0 | 67 dirty_card = 0, |
68 precleaned_card = 1, | |
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69 claimed_card = 2, |
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70 deferred_card = 4, |
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71 last_card = 8, |
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72 CT_MR_BS_last_reserved = 16 |
0 | 73 }; |
74 | |
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75 // a word's worth (row) of clean card values |
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76 static const intptr_t clean_card_row = (intptr_t)(-1); |
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77 |
0 | 78 // dirty and precleaned are equivalent wrt younger_refs_iter. |
79 static bool card_is_dirty_wrt_gen_iter(jbyte cv) { | |
80 return cv == dirty_card || cv == precleaned_card; | |
81 } | |
82 | |
83 // Returns "true" iff the value "cv" will cause the card containing it | |
84 // to be scanned in the current traversal. May be overridden by | |
85 // subtypes. | |
86 virtual bool card_will_be_scanned(jbyte cv) { | |
87 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv); | |
88 } | |
89 | |
90 // Returns "true" iff the value "cv" may have represented a dirty card at | |
91 // some point. | |
92 virtual bool card_may_have_been_dirty(jbyte cv) { | |
93 return card_is_dirty_wrt_gen_iter(cv); | |
94 } | |
95 | |
96 // The declaration order of these const fields is important; see the | |
97 // constructor before changing. | |
98 const MemRegion _whole_heap; // the region covered by the card table | |
99 const size_t _guard_index; // index of very last element in the card | |
100 // table; it is set to a guard value | |
101 // (last_card) and should never be modified | |
102 const size_t _last_valid_index; // index of the last valid element | |
103 const size_t _page_size; // page size used when mapping _byte_map | |
104 const size_t _byte_map_size; // in bytes | |
105 jbyte* _byte_map; // the card marking array | |
106 | |
107 int _cur_covered_regions; | |
108 // The covered regions should be in address order. | |
109 MemRegion* _covered; | |
110 // The committed regions correspond one-to-one to the covered regions. | |
111 // They represent the card-table memory that has been committed to service | |
112 // the corresponding covered region. It may be that committed region for | |
113 // one covered region corresponds to a larger region because of page-size | |
114 // roundings. Thus, a committed region for one covered region may | |
115 // actually extend onto the card-table space for the next covered region. | |
116 MemRegion* _committed; | |
117 | |
118 // The last card is a guard card, and we commit the page for it so | |
119 // we can use the card for verification purposes. We make sure we never | |
120 // uncommit the MemRegion for that page. | |
121 MemRegion _guard_region; | |
122 | |
123 protected: | |
124 // Initialization utilities; covered_words is the size of the covered region | |
125 // in, um, words. | |
126 inline size_t cards_required(size_t covered_words); | |
127 inline size_t compute_byte_map_size(); | |
128 | |
129 // Finds and return the index of the region, if any, to which the given | |
130 // region would be contiguous. If none exists, assign a new region and | |
131 // returns its index. Requires that no more than the maximum number of | |
132 // covered regions defined in the constructor are ever in use. | |
133 int find_covering_region_by_base(HeapWord* base); | |
134 | |
135 // Same as above, but finds the region containing the given address | |
136 // instead of starting at a given base address. | |
137 int find_covering_region_containing(HeapWord* addr); | |
138 | |
139 // Resize one of the regions covered by the remembered set. | |
140 void resize_covered_region(MemRegion new_region); | |
141 | |
142 // Returns the leftmost end of a committed region corresponding to a | |
143 // covered region before covered region "ind", or else "NULL" if "ind" is | |
144 // the first covered region. | |
145 HeapWord* largest_prev_committed_end(int ind) const; | |
146 | |
147 // Returns the part of the region mr that doesn't intersect with | |
148 // any committed region other than self. Used to prevent uncommitting | |
149 // regions that are also committed by other regions. Also protects | |
150 // against uncommitting the guard region. | |
151 MemRegion committed_unique_to_self(int self, MemRegion mr) const; | |
152 | |
153 // Mapping from address to card marking array entry | |
154 jbyte* byte_for(const void* p) const { | |
155 assert(_whole_heap.contains(p), | |
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156 err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of " |
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157 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")", |
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158 p, _whole_heap.start(), _whole_heap.end())); |
0 | 159 jbyte* result = &byte_map_base[uintptr_t(p) >> card_shift]; |
160 assert(result >= _byte_map && result < _byte_map + _byte_map_size, | |
161 "out of bounds accessor for card marking array"); | |
162 return result; | |
163 } | |
164 | |
165 // The card table byte one after the card marking array | |
166 // entry for argument address. Typically used for higher bounds | |
167 // for loops iterating through the card table. | |
168 jbyte* byte_after(const void* p) const { | |
169 return byte_for(p) + 1; | |
170 } | |
171 | |
172 // Iterate over the portion of the card-table which covers the given | |
173 // region mr in the given space and apply cl to any dirty sub-regions | |
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174 // of mr. Dirty cards are _not_ cleared by the iterator method itself, |
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175 // but closures may arrange to do so on their own should they so wish. |
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176 void non_clean_card_iterate_serial(MemRegion mr, MemRegionClosure* cl); |
0 | 177 |
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178 // A variant of the above that will operate in a parallel mode if |
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179 // worker threads are available, and clear the dirty cards as it |
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180 // processes them. |
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181 // XXX ??? MemRegionClosure above vs OopsInGenClosure below XXX |
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182 // XXX some new_dcto_cl's take OopClosure's, plus as above there are |
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183 // some MemRegionClosures. Clean this up everywhere. XXX |
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184 void non_clean_card_iterate_possibly_parallel(Space* sp, MemRegion mr, |
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185 OopsInGenClosure* cl, CardTableRS* ct); |
0 | 186 |
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187 private: |
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188 // Work method used to implement non_clean_card_iterate_possibly_parallel() |
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189 // above in the parallel case. |
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190 void non_clean_card_iterate_parallel_work(Space* sp, MemRegion mr, |
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191 OopsInGenClosure* cl, CardTableRS* ct, |
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192 int n_threads); |
0 | 193 |
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194 protected: |
0 | 195 // Dirty the bytes corresponding to "mr" (not all of which must be |
196 // covered.) | |
197 void dirty_MemRegion(MemRegion mr); | |
198 | |
199 // Clear (to clean_card) the bytes entirely contained within "mr" (not | |
200 // all of which must be covered.) | |
201 void clear_MemRegion(MemRegion mr); | |
202 | |
203 // *** Support for parallel card scanning. | |
204 | |
205 // This is an array, one element per covered region of the card table. | |
206 // Each entry is itself an array, with one element per chunk in the | |
207 // covered region. Each entry of these arrays is the lowest non-clean | |
208 // card of the corresponding chunk containing part of an object from the | |
209 // previous chunk, or else NULL. | |
210 typedef jbyte* CardPtr; | |
211 typedef CardPtr* CardArr; | |
212 CardArr* _lowest_non_clean; | |
213 size_t* _lowest_non_clean_chunk_size; | |
214 uintptr_t* _lowest_non_clean_base_chunk_index; | |
215 int* _last_LNC_resizing_collection; | |
216 | |
217 // Initializes "lowest_non_clean" to point to the array for the region | |
218 // covering "sp", and "lowest_non_clean_base_chunk_index" to the chunk | |
219 // index of the corresponding to the first element of that array. | |
220 // Ensures that these arrays are of sufficient size, allocating if necessary. | |
221 // May be called by several threads concurrently. | |
222 void get_LNC_array_for_space(Space* sp, | |
223 jbyte**& lowest_non_clean, | |
224 uintptr_t& lowest_non_clean_base_chunk_index, | |
225 size_t& lowest_non_clean_chunk_size); | |
226 | |
227 // Returns the number of chunks necessary to cover "mr". | |
228 size_t chunks_to_cover(MemRegion mr) { | |
229 return (size_t)(addr_to_chunk_index(mr.last()) - | |
230 addr_to_chunk_index(mr.start()) + 1); | |
231 } | |
232 | |
233 // Returns the index of the chunk in a stride which | |
234 // covers the given address. | |
235 uintptr_t addr_to_chunk_index(const void* addr) { | |
236 uintptr_t card = (uintptr_t) byte_for(addr); | |
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237 return card / ParGCCardsPerStrideChunk; |
0 | 238 } |
239 | |
240 // Apply cl, which must either itself apply dcto_cl or be dcto_cl, | |
241 // to the cards in the stride (of n_strides) within the given space. | |
242 void process_stride(Space* sp, | |
243 MemRegion used, | |
244 jint stride, int n_strides, | |
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245 OopsInGenClosure* cl, |
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246 CardTableRS* ct, |
0 | 247 jbyte** lowest_non_clean, |
248 uintptr_t lowest_non_clean_base_chunk_index, | |
249 size_t lowest_non_clean_chunk_size); | |
250 | |
251 // Makes sure that chunk boundaries are handled appropriately, by | |
252 // adjusting the min_done of dcto_cl, and by using a special card-table | |
253 // value to indicate how min_done should be set. | |
254 void process_chunk_boundaries(Space* sp, | |
255 DirtyCardToOopClosure* dcto_cl, | |
256 MemRegion chunk_mr, | |
257 MemRegion used, | |
258 jbyte** lowest_non_clean, | |
259 uintptr_t lowest_non_clean_base_chunk_index, | |
260 size_t lowest_non_clean_chunk_size); | |
261 | |
262 public: | |
263 // Constants | |
264 enum SomePublicConstants { | |
265 card_shift = 9, | |
266 card_size = 1 << card_shift, | |
267 card_size_in_words = card_size / sizeof(HeapWord) | |
268 }; | |
269 | |
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270 static int clean_card_val() { return clean_card; } |
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271 static int clean_card_mask_val() { return clean_card_mask; } |
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272 static int dirty_card_val() { return dirty_card; } |
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273 static int claimed_card_val() { return claimed_card; } |
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274 static int precleaned_card_val() { return precleaned_card; } |
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275 static int deferred_card_val() { return deferred_card; } |
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276 |
0 | 277 // For RTTI simulation. |
278 bool is_a(BarrierSet::Name bsn) { | |
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279 return bsn == BarrierSet::CardTableModRef || ModRefBarrierSet::is_a(bsn); |
0 | 280 } |
281 | |
282 CardTableModRefBS(MemRegion whole_heap, int max_covered_regions); | |
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283 ~CardTableModRefBS(); |
0 | 284 |
285 // *** Barrier set functions. | |
286 | |
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287 bool has_write_ref_pre_barrier() { return false; } |
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288 |
0 | 289 // Record a reference update. Note that these versions are precise! |
290 // The scanning code has to handle the fact that the write barrier may be | |
291 // either precise or imprecise. We make non-virtual inline variants of | |
292 // these functions here for performance. | |
293 protected: | |
294 void write_ref_field_work(oop obj, size_t offset, oop newVal); | |
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295 virtual void write_ref_field_work(void* field, oop newVal); |
0 | 296 public: |
297 | |
298 bool has_write_ref_array_opt() { return true; } | |
299 bool has_write_region_opt() { return true; } | |
300 | |
301 inline void inline_write_region(MemRegion mr) { | |
302 dirty_MemRegion(mr); | |
303 } | |
304 protected: | |
305 void write_region_work(MemRegion mr) { | |
306 inline_write_region(mr); | |
307 } | |
308 public: | |
309 | |
310 inline void inline_write_ref_array(MemRegion mr) { | |
311 dirty_MemRegion(mr); | |
312 } | |
313 protected: | |
314 void write_ref_array_work(MemRegion mr) { | |
315 inline_write_ref_array(mr); | |
316 } | |
317 public: | |
318 | |
319 bool is_aligned(HeapWord* addr) { | |
320 return is_card_aligned(addr); | |
321 } | |
322 | |
323 // *** Card-table-barrier-specific things. | |
324 | |
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325 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {} |
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326 |
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327 template <class T> inline void inline_write_ref_field(T* field, oop newVal) { |
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328 jbyte* byte = byte_for((void*)field); |
0 | 329 *byte = dirty_card; |
330 } | |
331 | |
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332 // These are used by G1, when it uses the card table as a temporary data |
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333 // structure for card claiming. |
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334 bool is_card_dirty(size_t card_index) { |
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335 return _byte_map[card_index] == dirty_card_val(); |
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336 } |
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337 |
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338 void mark_card_dirty(size_t card_index) { |
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339 _byte_map[card_index] = dirty_card_val(); |
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340 } |
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341 |
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342 bool is_card_clean(size_t card_index) { |
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343 return _byte_map[card_index] == clean_card_val(); |
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344 } |
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345 |
0 | 346 // Card marking array base (adjusted for heap low boundary) |
347 // This would be the 0th element of _byte_map, if the heap started at 0x0. | |
348 // But since the heap starts at some higher address, this points to somewhere | |
349 // before the beginning of the actual _byte_map. | |
350 jbyte* byte_map_base; | |
351 | |
352 // Return true if "p" is at the start of a card. | |
353 bool is_card_aligned(HeapWord* p) { | |
354 jbyte* pcard = byte_for(p); | |
355 return (addr_for(pcard) == p); | |
356 } | |
357 | |
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358 HeapWord* align_to_card_boundary(HeapWord* p) { |
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359 jbyte* pcard = byte_for(p + card_size_in_words - 1); |
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360 return addr_for(pcard); |
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361 } |
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362 |
0 | 363 // The kinds of precision a CardTableModRefBS may offer. |
364 enum PrecisionStyle { | |
365 Precise, | |
366 ObjHeadPreciseArray | |
367 }; | |
368 | |
369 // Tells what style of precision this card table offers. | |
370 PrecisionStyle precision() { | |
371 return ObjHeadPreciseArray; // Only one supported for now. | |
372 } | |
373 | |
374 // ModRefBS functions. | |
342
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375 virtual void invalidate(MemRegion mr, bool whole_heap = false); |
0 | 376 void clear(MemRegion mr); |
342
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377 void dirty(MemRegion mr); |
0 | 378 |
379 // *** Card-table-RemSet-specific things. | |
380 | |
381 // Invoke "cl.do_MemRegion" on a set of MemRegions that collectively | |
382 // includes all the modified cards (expressing each card as a | |
383 // MemRegion). Thus, several modified cards may be lumped into one | |
384 // region. The regions are non-overlapping, and are visited in | |
385 // *decreasing* address order. (This order aids with imprecise card | |
386 // marking, where a dirty card may cause scanning, and summarization | |
387 // marking, of objects that extend onto subsequent cards.) | |
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388 void mod_card_iterate(MemRegionClosure* cl) { |
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389 non_clean_card_iterate_serial(_whole_heap, cl); |
0 | 390 } |
391 | |
392 // Like the "mod_cards_iterate" above, except only invokes the closure | |
393 // for cards within the MemRegion "mr" (which is required to be | |
394 // card-aligned and sized.) | |
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395 void mod_card_iterate(MemRegion mr, MemRegionClosure* cl) { |
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396 non_clean_card_iterate_serial(mr, cl); |
0 | 397 } |
398 | |
399 static uintx ct_max_alignment_constraint(); | |
400 | |
342
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401 // Apply closure "cl" to the dirty cards containing some part of |
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402 // MemRegion "mr". |
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403 void dirty_card_iterate(MemRegion mr, MemRegionClosure* cl); |
0 | 404 |
405 // Return the MemRegion corresponding to the first maximal run | |
342
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406 // of dirty cards lying completely within MemRegion mr. |
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407 // If reset is "true", then sets those card table entries to the given |
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408 // value. |
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409 MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset, |
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410 int reset_val); |
0 | 411 |
342
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412 // Provide read-only access to the card table array. |
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413 const jbyte* byte_for_const(const void* p) const { |
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414 return byte_for(p); |
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415 } |
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416 const jbyte* byte_after_const(const void* p) const { |
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417 return byte_after(p); |
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418 } |
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419 |
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420 // Mapping from card marking array entry to address of first word |
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421 HeapWord* addr_for(const jbyte* p) const { |
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422 assert(p >= _byte_map && p < _byte_map + _byte_map_size, |
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423 "out of bounds access to card marking array"); |
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424 size_t delta = pointer_delta(p, byte_map_base, sizeof(jbyte)); |
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425 HeapWord* result = (HeapWord*) (delta << card_shift); |
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426 assert(_whole_heap.contains(result), |
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427 err_msg("Returning result = "PTR_FORMAT" out of bounds of " |
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428 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")", |
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429 result, _whole_heap.start(), _whole_heap.end())); |
342
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430 return result; |
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431 } |
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432 |
0 | 433 // Mapping from address to card marking array index. |
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434 size_t index_for(void* p) { |
0 | 435 assert(_whole_heap.contains(p), |
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436 err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of " |
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437 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")", |
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438 p, _whole_heap.start(), _whole_heap.end())); |
0 | 439 return byte_for(p) - _byte_map; |
440 } | |
441 | |
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442 const jbyte* byte_for_index(const size_t card_index) const { |
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443 return _byte_map + card_index; |
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444 } |
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445 |
5984 | 446 // Print a description of the memory for the barrier set |
447 virtual void print_on(outputStream* st) const; | |
448 | |
0 | 449 void verify(); |
450 void verify_guard(); | |
451 | |
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452 // val_equals -> it will check that all cards covered by mr equal val |
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453 // !val_equals -> it will check that all cards covered by mr do not equal val |
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454 void verify_region(MemRegion mr, jbyte val, bool val_equals) PRODUCT_RETURN; |
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455 void verify_not_dirty_region(MemRegion mr) PRODUCT_RETURN; |
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456 void verify_dirty_region(MemRegion mr) PRODUCT_RETURN; |
0 | 457 |
458 static size_t par_chunk_heapword_alignment() { | |
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459 return ParGCCardsPerStrideChunk * card_size_in_words; |
0 | 460 } |
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461 |
0 | 462 }; |
463 | |
464 class CardTableRS; | |
465 | |
466 // A specialization for the CardTableRS gen rem set. | |
467 class CardTableModRefBSForCTRS: public CardTableModRefBS { | |
468 CardTableRS* _rs; | |
469 protected: | |
470 bool card_will_be_scanned(jbyte cv); | |
471 bool card_may_have_been_dirty(jbyte cv); | |
472 public: | |
473 CardTableModRefBSForCTRS(MemRegion whole_heap, | |
474 int max_covered_regions) : | |
475 CardTableModRefBS(whole_heap, max_covered_regions) {} | |
476 | |
477 void set_CTRS(CardTableRS* rs) { _rs = rs; } | |
478 }; | |
1972 | 479 |
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480 |
1972 | 481 #endif // SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP |