Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | d2ede61b7a12 |
| children | abdfc822206f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1692 | 2 * Copyright (c) 2000, 2010, 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; | |
| 47 | |
| 48 class CardTableModRefBS: public ModRefBarrierSet { | |
| 49 // Some classes get to look at some private stuff. | |
| 50 friend class BytecodeInterpreter; | |
| 51 friend class VMStructs; | |
| 52 friend class CardTableRS; | |
| 53 friend class CheckForUnmarkedOops; // Needs access to raw card bytes. | |
| 1692 | 54 friend class SharkBuilder; |
| 0 | 55 #ifndef PRODUCT |
| 56 // For debugging. | |
| 57 friend class GuaranteeNotModClosure; | |
| 58 #endif | |
| 59 protected: | |
| 60 | |
| 61 enum CardValues { | |
| 62 clean_card = -1, | |
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63 // The mask contains zeros in places for all other values. |
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64 clean_card_mask = clean_card - 31, |
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65 |
| 0 | 66 dirty_card = 0, |
| 67 precleaned_card = 1, | |
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68 claimed_card = 2, |
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69 deferred_card = 4, |
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70 last_card = 8, |
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71 CT_MR_BS_last_reserved = 16 |
| 0 | 72 }; |
| 73 | |
| 74 // dirty and precleaned are equivalent wrt younger_refs_iter. | |
| 75 static bool card_is_dirty_wrt_gen_iter(jbyte cv) { | |
| 76 return cv == dirty_card || cv == precleaned_card; | |
| 77 } | |
| 78 | |
| 79 // Returns "true" iff the value "cv" will cause the card containing it | |
| 80 // to be scanned in the current traversal. May be overridden by | |
| 81 // subtypes. | |
| 82 virtual bool card_will_be_scanned(jbyte cv) { | |
| 83 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv); | |
| 84 } | |
| 85 | |
| 86 // Returns "true" iff the value "cv" may have represented a dirty card at | |
| 87 // some point. | |
| 88 virtual bool card_may_have_been_dirty(jbyte cv) { | |
| 89 return card_is_dirty_wrt_gen_iter(cv); | |
| 90 } | |
| 91 | |
| 92 // The declaration order of these const fields is important; see the | |
| 93 // constructor before changing. | |
| 94 const MemRegion _whole_heap; // the region covered by the card table | |
| 95 const size_t _guard_index; // index of very last element in the card | |
| 96 // table; it is set to a guard value | |
| 97 // (last_card) and should never be modified | |
| 98 const size_t _last_valid_index; // index of the last valid element | |
| 99 const size_t _page_size; // page size used when mapping _byte_map | |
| 100 const size_t _byte_map_size; // in bytes | |
| 101 jbyte* _byte_map; // the card marking array | |
| 102 | |
| 103 int _cur_covered_regions; | |
| 104 // The covered regions should be in address order. | |
| 105 MemRegion* _covered; | |
| 106 // The committed regions correspond one-to-one to the covered regions. | |
| 107 // They represent the card-table memory that has been committed to service | |
| 108 // the corresponding covered region. It may be that committed region for | |
| 109 // one covered region corresponds to a larger region because of page-size | |
| 110 // roundings. Thus, a committed region for one covered region may | |
| 111 // actually extend onto the card-table space for the next covered region. | |
| 112 MemRegion* _committed; | |
| 113 | |
| 114 // The last card is a guard card, and we commit the page for it so | |
| 115 // we can use the card for verification purposes. We make sure we never | |
| 116 // uncommit the MemRegion for that page. | |
| 117 MemRegion _guard_region; | |
| 118 | |
| 119 protected: | |
| 120 // Initialization utilities; covered_words is the size of the covered region | |
| 121 // in, um, words. | |
| 122 inline size_t cards_required(size_t covered_words); | |
| 123 inline size_t compute_byte_map_size(); | |
| 124 | |
| 125 // Finds and return the index of the region, if any, to which the given | |
| 126 // region would be contiguous. If none exists, assign a new region and | |
| 127 // returns its index. Requires that no more than the maximum number of | |
| 128 // covered regions defined in the constructor are ever in use. | |
| 129 int find_covering_region_by_base(HeapWord* base); | |
| 130 | |
| 131 // Same as above, but finds the region containing the given address | |
| 132 // instead of starting at a given base address. | |
| 133 int find_covering_region_containing(HeapWord* addr); | |
| 134 | |
| 135 // Resize one of the regions covered by the remembered set. | |
| 136 void resize_covered_region(MemRegion new_region); | |
| 137 | |
| 138 // Returns the leftmost end of a committed region corresponding to a | |
| 139 // covered region before covered region "ind", or else "NULL" if "ind" is | |
| 140 // the first covered region. | |
| 141 HeapWord* largest_prev_committed_end(int ind) const; | |
| 142 | |
| 143 // Returns the part of the region mr that doesn't intersect with | |
| 144 // any committed region other than self. Used to prevent uncommitting | |
| 145 // regions that are also committed by other regions. Also protects | |
| 146 // against uncommitting the guard region. | |
| 147 MemRegion committed_unique_to_self(int self, MemRegion mr) const; | |
| 148 | |
| 149 // Mapping from address to card marking array entry | |
| 150 jbyte* byte_for(const void* p) const { | |
| 151 assert(_whole_heap.contains(p), | |
| 152 "out of bounds access to card marking array"); | |
| 153 jbyte* result = &byte_map_base[uintptr_t(p) >> card_shift]; | |
| 154 assert(result >= _byte_map && result < _byte_map + _byte_map_size, | |
| 155 "out of bounds accessor for card marking array"); | |
| 156 return result; | |
| 157 } | |
| 158 | |
| 159 // The card table byte one after the card marking array | |
| 160 // entry for argument address. Typically used for higher bounds | |
| 161 // for loops iterating through the card table. | |
| 162 jbyte* byte_after(const void* p) const { | |
| 163 return byte_for(p) + 1; | |
| 164 } | |
| 165 | |
| 166 // Iterate over the portion of the card-table which covers the given | |
| 167 // region mr in the given space and apply cl to any dirty sub-regions | |
| 168 // of mr. cl and dcto_cl must either be the same closure or cl must | |
| 169 // wrap dcto_cl. Both are required - neither may be NULL. Also, dcto_cl | |
| 170 // may be modified. Note that this function will operate in a parallel | |
| 171 // mode if worker threads are available. | |
| 172 void non_clean_card_iterate(Space* sp, MemRegion mr, | |
| 173 DirtyCardToOopClosure* dcto_cl, | |
| 174 MemRegionClosure* cl, | |
| 175 bool clear); | |
| 176 | |
| 177 // Utility function used to implement the other versions below. | |
| 178 void non_clean_card_iterate_work(MemRegion mr, MemRegionClosure* cl, | |
| 179 bool clear); | |
| 180 | |
| 181 void par_non_clean_card_iterate_work(Space* sp, MemRegion mr, | |
| 182 DirtyCardToOopClosure* dcto_cl, | |
| 183 MemRegionClosure* cl, | |
| 184 bool clear, | |
| 185 int n_threads); | |
| 186 | |
| 187 // Dirty the bytes corresponding to "mr" (not all of which must be | |
| 188 // covered.) | |
| 189 void dirty_MemRegion(MemRegion mr); | |
| 190 | |
| 191 // Clear (to clean_card) the bytes entirely contained within "mr" (not | |
| 192 // all of which must be covered.) | |
| 193 void clear_MemRegion(MemRegion mr); | |
| 194 | |
| 195 // *** Support for parallel card scanning. | |
| 196 | |
| 197 enum SomeConstantsForParallelism { | |
| 198 StridesPerThread = 2, | |
| 199 CardsPerStrideChunk = 256 | |
| 200 }; | |
| 201 | |
| 202 // This is an array, one element per covered region of the card table. | |
| 203 // Each entry is itself an array, with one element per chunk in the | |
| 204 // covered region. Each entry of these arrays is the lowest non-clean | |
| 205 // card of the corresponding chunk containing part of an object from the | |
| 206 // previous chunk, or else NULL. | |
| 207 typedef jbyte* CardPtr; | |
| 208 typedef CardPtr* CardArr; | |
| 209 CardArr* _lowest_non_clean; | |
| 210 size_t* _lowest_non_clean_chunk_size; | |
| 211 uintptr_t* _lowest_non_clean_base_chunk_index; | |
| 212 int* _last_LNC_resizing_collection; | |
| 213 | |
| 214 // Initializes "lowest_non_clean" to point to the array for the region | |
| 215 // covering "sp", and "lowest_non_clean_base_chunk_index" to the chunk | |
| 216 // index of the corresponding to the first element of that array. | |
| 217 // Ensures that these arrays are of sufficient size, allocating if necessary. | |
| 218 // May be called by several threads concurrently. | |
| 219 void get_LNC_array_for_space(Space* sp, | |
| 220 jbyte**& lowest_non_clean, | |
| 221 uintptr_t& lowest_non_clean_base_chunk_index, | |
| 222 size_t& lowest_non_clean_chunk_size); | |
| 223 | |
| 224 // Returns the number of chunks necessary to cover "mr". | |
| 225 size_t chunks_to_cover(MemRegion mr) { | |
| 226 return (size_t)(addr_to_chunk_index(mr.last()) - | |
| 227 addr_to_chunk_index(mr.start()) + 1); | |
| 228 } | |
| 229 | |
| 230 // Returns the index of the chunk in a stride which | |
| 231 // covers the given address. | |
| 232 uintptr_t addr_to_chunk_index(const void* addr) { | |
| 233 uintptr_t card = (uintptr_t) byte_for(addr); | |
| 234 return card / CardsPerStrideChunk; | |
| 235 } | |
| 236 | |
| 237 // Apply cl, which must either itself apply dcto_cl or be dcto_cl, | |
| 238 // to the cards in the stride (of n_strides) within the given space. | |
| 239 void process_stride(Space* sp, | |
| 240 MemRegion used, | |
| 241 jint stride, int n_strides, | |
| 242 DirtyCardToOopClosure* dcto_cl, | |
| 243 MemRegionClosure* cl, | |
| 244 bool clear, | |
| 245 jbyte** lowest_non_clean, | |
| 246 uintptr_t lowest_non_clean_base_chunk_index, | |
| 247 size_t lowest_non_clean_chunk_size); | |
| 248 | |
| 249 // Makes sure that chunk boundaries are handled appropriately, by | |
| 250 // adjusting the min_done of dcto_cl, and by using a special card-table | |
| 251 // value to indicate how min_done should be set. | |
| 252 void process_chunk_boundaries(Space* sp, | |
| 253 DirtyCardToOopClosure* dcto_cl, | |
| 254 MemRegion chunk_mr, | |
| 255 MemRegion used, | |
| 256 jbyte** lowest_non_clean, | |
| 257 uintptr_t lowest_non_clean_base_chunk_index, | |
| 258 size_t lowest_non_clean_chunk_size); | |
| 259 | |
| 260 public: | |
| 261 // Constants | |
| 262 enum SomePublicConstants { | |
| 263 card_shift = 9, | |
| 264 card_size = 1 << card_shift, | |
| 265 card_size_in_words = card_size / sizeof(HeapWord) | |
| 266 }; | |
| 267 | |
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268 static int clean_card_val() { return clean_card; } |
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269 static int clean_card_mask_val() { return clean_card_mask; } |
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270 static int dirty_card_val() { return dirty_card; } |
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271 static int claimed_card_val() { return claimed_card; } |
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272 static int precleaned_card_val() { return precleaned_card; } |
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273 static int deferred_card_val() { return deferred_card; } |
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274 |
| 0 | 275 // For RTTI simulation. |
| 276 bool is_a(BarrierSet::Name bsn) { | |
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277 return bsn == BarrierSet::CardTableModRef || ModRefBarrierSet::is_a(bsn); |
| 0 | 278 } |
| 279 | |
| 280 CardTableModRefBS(MemRegion whole_heap, int max_covered_regions); | |
| 281 | |
| 282 // *** Barrier set functions. | |
| 283 | |
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284 bool has_write_ref_pre_barrier() { return false; } |
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285 |
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286 inline bool write_ref_needs_barrier(void* field, oop new_val) { |
| 0 | 287 // Note that this assumes the perm gen is the highest generation |
| 288 // in the address space | |
| 289 return new_val != NULL && !new_val->is_perm(); | |
| 290 } | |
| 291 | |
| 292 // Record a reference update. Note that these versions are precise! | |
| 293 // The scanning code has to handle the fact that the write barrier may be | |
| 294 // either precise or imprecise. We make non-virtual inline variants of | |
| 295 // these functions here for performance. | |
| 296 protected: | |
| 297 void write_ref_field_work(oop obj, size_t offset, oop newVal); | |
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298 virtual void write_ref_field_work(void* field, oop newVal); |
| 0 | 299 public: |
| 300 | |
| 301 bool has_write_ref_array_opt() { return true; } | |
| 302 bool has_write_region_opt() { return true; } | |
| 303 | |
| 304 inline void inline_write_region(MemRegion mr) { | |
| 305 dirty_MemRegion(mr); | |
| 306 } | |
| 307 protected: | |
| 308 void write_region_work(MemRegion mr) { | |
| 309 inline_write_region(mr); | |
| 310 } | |
| 311 public: | |
| 312 | |
| 313 inline void inline_write_ref_array(MemRegion mr) { | |
| 314 dirty_MemRegion(mr); | |
| 315 } | |
| 316 protected: | |
| 317 void write_ref_array_work(MemRegion mr) { | |
| 318 inline_write_ref_array(mr); | |
| 319 } | |
| 320 public: | |
| 321 | |
| 322 bool is_aligned(HeapWord* addr) { | |
| 323 return is_card_aligned(addr); | |
| 324 } | |
| 325 | |
| 326 // *** Card-table-barrier-specific things. | |
| 327 | |
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328 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {} |
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329 |
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330 template <class T> inline void inline_write_ref_field(T* field, oop newVal) { |
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331 jbyte* byte = byte_for((void*)field); |
| 0 | 332 *byte = dirty_card; |
| 333 } | |
| 334 | |
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335 // These are used by G1, when it uses the card table as a temporary data |
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336 // structure for card claiming. |
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337 bool is_card_dirty(size_t card_index) { |
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338 return _byte_map[card_index] == dirty_card_val(); |
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339 } |
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340 |
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341 void mark_card_dirty(size_t card_index) { |
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342 _byte_map[card_index] = dirty_card_val(); |
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343 } |
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344 |
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345 bool is_card_claimed(size_t card_index) { |
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346 jbyte val = _byte_map[card_index]; |
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347 return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); |
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348 } |
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349 |
| 1261 | 350 void set_card_claimed(size_t card_index) { |
| 351 jbyte val = _byte_map[card_index]; | |
| 352 if (val == clean_card_val()) { | |
| 353 val = (jbyte)claimed_card_val(); | |
| 354 } else { | |
| 355 val |= (jbyte)claimed_card_val(); | |
| 356 } | |
| 357 _byte_map[card_index] = val; | |
| 358 } | |
| 359 | |
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360 bool claim_card(size_t card_index); |
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361 |
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362 bool is_card_clean(size_t card_index) { |
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363 return _byte_map[card_index] == clean_card_val(); |
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364 } |
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365 |
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366 bool is_card_deferred(size_t card_index) { |
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367 jbyte val = _byte_map[card_index]; |
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368 return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); |
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369 } |
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370 |
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371 bool mark_card_deferred(size_t card_index); |
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372 |
| 0 | 373 // Card marking array base (adjusted for heap low boundary) |
| 374 // This would be the 0th element of _byte_map, if the heap started at 0x0. | |
| 375 // But since the heap starts at some higher address, this points to somewhere | |
| 376 // before the beginning of the actual _byte_map. | |
| 377 jbyte* byte_map_base; | |
| 378 | |
| 379 // Return true if "p" is at the start of a card. | |
| 380 bool is_card_aligned(HeapWord* p) { | |
| 381 jbyte* pcard = byte_for(p); | |
| 382 return (addr_for(pcard) == p); | |
| 383 } | |
| 384 | |
| 385 // The kinds of precision a CardTableModRefBS may offer. | |
| 386 enum PrecisionStyle { | |
| 387 Precise, | |
| 388 ObjHeadPreciseArray | |
| 389 }; | |
| 390 | |
| 391 // Tells what style of precision this card table offers. | |
| 392 PrecisionStyle precision() { | |
| 393 return ObjHeadPreciseArray; // Only one supported for now. | |
| 394 } | |
| 395 | |
| 396 // ModRefBS functions. | |
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397 virtual void invalidate(MemRegion mr, bool whole_heap = false); |
| 0 | 398 void clear(MemRegion mr); |
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399 void dirty(MemRegion mr); |
| 0 | 400 void mod_oop_in_space_iterate(Space* sp, OopClosure* cl, |
| 401 bool clear = false, | |
| 402 bool before_save_marks = false); | |
| 403 | |
| 404 // *** Card-table-RemSet-specific things. | |
| 405 | |
| 406 // Invoke "cl.do_MemRegion" on a set of MemRegions that collectively | |
| 407 // includes all the modified cards (expressing each card as a | |
| 408 // MemRegion). Thus, several modified cards may be lumped into one | |
| 409 // region. The regions are non-overlapping, and are visited in | |
| 410 // *decreasing* address order. (This order aids with imprecise card | |
| 411 // marking, where a dirty card may cause scanning, and summarization | |
| 412 // marking, of objects that extend onto subsequent cards.) | |
| 413 // If "clear" is true, the card is (conceptually) marked unmodified before | |
| 414 // applying the closure. | |
| 415 void mod_card_iterate(MemRegionClosure* cl, bool clear = false) { | |
| 416 non_clean_card_iterate_work(_whole_heap, cl, clear); | |
| 417 } | |
| 418 | |
| 419 // Like the "mod_cards_iterate" above, except only invokes the closure | |
| 420 // for cards within the MemRegion "mr" (which is required to be | |
| 421 // card-aligned and sized.) | |
| 422 void mod_card_iterate(MemRegion mr, MemRegionClosure* cl, | |
| 423 bool clear = false) { | |
| 424 non_clean_card_iterate_work(mr, cl, clear); | |
| 425 } | |
| 426 | |
| 427 static uintx ct_max_alignment_constraint(); | |
| 428 | |
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429 // Apply closure "cl" to the dirty cards containing some part of |
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430 // MemRegion "mr". |
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431 void dirty_card_iterate(MemRegion mr, MemRegionClosure* cl); |
| 0 | 432 |
| 433 // Return the MemRegion corresponding to the first maximal run | |
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434 // of dirty cards lying completely within MemRegion mr. |
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435 // If reset is "true", then sets those card table entries to the given |
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436 // value. |
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437 MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset, |
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438 int reset_val); |
| 0 | 439 |
| 440 // Set all the dirty cards in the given region to precleaned state. | |
| 441 void preclean_dirty_cards(MemRegion mr); | |
| 442 | |
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443 // Provide read-only access to the card table array. |
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444 const jbyte* byte_for_const(const void* p) const { |
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445 return byte_for(p); |
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446 } |
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447 const jbyte* byte_after_const(const void* p) const { |
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448 return byte_after(p); |
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449 } |
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450 |
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451 // Mapping from card marking array entry to address of first word |
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452 HeapWord* addr_for(const jbyte* p) const { |
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453 assert(p >= _byte_map && p < _byte_map + _byte_map_size, |
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454 "out of bounds access to card marking array"); |
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455 size_t delta = pointer_delta(p, byte_map_base, sizeof(jbyte)); |
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456 HeapWord* result = (HeapWord*) (delta << card_shift); |
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457 assert(_whole_heap.contains(result), |
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458 "out of bounds accessor from card marking array"); |
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459 return result; |
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460 } |
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461 |
| 0 | 462 // Mapping from address to card marking array index. |
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463 size_t index_for(void* p) { |
| 0 | 464 assert(_whole_heap.contains(p), |
| 465 "out of bounds access to card marking array"); | |
| 466 return byte_for(p) - _byte_map; | |
| 467 } | |
| 468 | |
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469 const jbyte* byte_for_index(const size_t card_index) const { |
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470 return _byte_map + card_index; |
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471 } |
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472 |
| 0 | 473 void verify(); |
| 474 void verify_guard(); | |
| 475 | |
| 476 void verify_clean_region(MemRegion mr) PRODUCT_RETURN; | |
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477 void verify_dirty_region(MemRegion mr) PRODUCT_RETURN; |
| 0 | 478 |
| 479 static size_t par_chunk_heapword_alignment() { | |
| 480 return CardsPerStrideChunk * card_size_in_words; | |
| 481 } | |
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482 |
| 0 | 483 }; |
| 484 | |
| 485 class CardTableRS; | |
| 486 | |
| 487 // A specialization for the CardTableRS gen rem set. | |
| 488 class CardTableModRefBSForCTRS: public CardTableModRefBS { | |
| 489 CardTableRS* _rs; | |
| 490 protected: | |
| 491 bool card_will_be_scanned(jbyte cv); | |
| 492 bool card_may_have_been_dirty(jbyte cv); | |
| 493 public: | |
| 494 CardTableModRefBSForCTRS(MemRegion whole_heap, | |
| 495 int max_covered_regions) : | |
| 496 CardTableModRefBS(whole_heap, max_covered_regions) {} | |
| 497 | |
| 498 void set_CTRS(CardTableRS* rs) { _rs = rs; } | |
| 499 }; | |
| 1972 | 500 |
| 501 #endif // SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP |