truffle: src/share/vm/memory/cardTableModRefBS.hpp annotate

annotate src/share/vm/memory/cardTableModRefBS.hpp @ 20337:1f1d373cd044

8038423: G1: Decommit memory within heap Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps. Reviewed-by: mgerdin, brutisso, jwilhelm

author	tschatzl
date	Thu, 21 Aug 2014 11:47:10 +0200
parents	78bbf4d43a14
children	7848fc12602b

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 14443 diff changeset	2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1261 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1261 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1261 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	25 #ifndef SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	26 #define SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	28 #include "memory/modRefBarrierSet.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	29 #include "oops/oop.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	30 #include "oops/oop.inline2.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	31
0 a61af66fc99e Initial load duke parents: diff changeset	32 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
a61af66fc99e Initial load duke parents: diff changeset	33 // enumerate ref fields that have been modified (since the last
a61af66fc99e Initial load duke parents: diff changeset	34 // enumeration.)
a61af66fc99e Initial load duke parents: diff changeset	35
a61af66fc99e Initial load duke parents: diff changeset	36 // As it currently stands, this barrier is imprecise: when a ref field in
a61af66fc99e Initial load duke parents: diff changeset	37 // an object "o" is modified, the card table entry for the card containing
a61af66fc99e Initial load duke parents: diff changeset	38 // the head of "o" is dirtied, not necessarily the card containing the
a61af66fc99e Initial load duke parents: diff changeset	39 // modified field itself. For object arrays, however, the barrier is
a61af66fc99e Initial load duke parents: diff changeset	40 // precise; only the card containing the modified element is dirtied.
a61af66fc99e Initial load duke parents: diff changeset	41 // Any MemRegionClosures used to scan dirty cards should take these
a61af66fc99e Initial load duke parents: diff changeset	42 // considerations into account.
a61af66fc99e Initial load duke parents: diff changeset	43
a61af66fc99e Initial load duke parents: diff changeset	44 class Generation;
a61af66fc99e Initial load duke parents: diff changeset	45 class OopsInGenClosure;
a61af66fc99e Initial load duke parents: diff changeset	46 class DirtyCardToOopClosure;
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	47 class ClearNoncleanCardWrapper;
0 a61af66fc99e Initial load duke parents: diff changeset	48
a61af66fc99e Initial load duke parents: diff changeset	49 class CardTableModRefBS: public ModRefBarrierSet {
a61af66fc99e Initial load duke parents: diff changeset	50 // Some classes get to look at some private stuff.
a61af66fc99e Initial load duke parents: diff changeset	51 friend class BytecodeInterpreter;
a61af66fc99e Initial load duke parents: diff changeset	52 friend class VMStructs;
a61af66fc99e Initial load duke parents: diff changeset	53 friend class CardTableRS;
a61af66fc99e Initial load duke parents: diff changeset	54 friend class CheckForUnmarkedOops; // Needs access to raw card bytes.
1692 d2ede61b7a12 6976186: integrate Shark HotSpot changes twisti parents: 1552 diff changeset	55 friend class SharkBuilder;
0 a61af66fc99e Initial load duke parents: diff changeset	56 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	57 // For debugging.
a61af66fc99e Initial load duke parents: diff changeset	58 friend class GuaranteeNotModClosure;
a61af66fc99e Initial load duke parents: diff changeset	59 #endif
a61af66fc99e Initial load duke parents: diff changeset	60 protected:
a61af66fc99e Initial load duke parents: diff changeset	61
a61af66fc99e Initial load duke parents: diff changeset	62 enum CardValues {
a61af66fc99e Initial load duke parents: diff changeset	63 clean_card = -1,
616 4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	64 // The mask contains zeros in places for all other values.
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	65 clean_card_mask = clean_card - 31,
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	66
0 a61af66fc99e Initial load duke parents: diff changeset	67 dirty_card = 0,
a61af66fc99e Initial load duke parents: diff changeset	68 precleaned_card = 1,
616 4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	69 claimed_card = 2,
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	70 deferred_card = 4,
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	71 last_card = 8,
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	72 CT_MR_BS_last_reserved = 16
0 a61af66fc99e Initial load duke parents: diff changeset	73 };
a61af66fc99e Initial load duke parents: diff changeset	74
5939 c7a555a9449a 7068625: Testing 8 bytes of card table entries at a time speeds up card-scanning brutisso parents: 4098 diff changeset	75 // a word's worth (row) of clean card values
c7a555a9449a 7068625: Testing 8 bytes of card table entries at a time speeds up card-scanning brutisso parents: 4098 diff changeset	76 static const intptr_t clean_card_row = (intptr_t)(-1);
c7a555a9449a 7068625: Testing 8 bytes of card table entries at a time speeds up card-scanning brutisso parents: 4098 diff changeset	77
0 a61af66fc99e Initial load duke parents: diff changeset	78 // dirty and precleaned are equivalent wrt younger_refs_iter.
a61af66fc99e Initial load duke parents: diff changeset	79 static bool card_is_dirty_wrt_gen_iter(jbyte cv) {
a61af66fc99e Initial load duke parents: diff changeset	80 return cv == dirty_card \|\| cv == precleaned_card;
a61af66fc99e Initial load duke parents: diff changeset	81 }
a61af66fc99e Initial load duke parents: diff changeset	82
a61af66fc99e Initial load duke parents: diff changeset	83 // Returns "true" iff the value "cv" will cause the card containing it
a61af66fc99e Initial load duke parents: diff changeset	84 // to be scanned in the current traversal. May be overridden by
a61af66fc99e Initial load duke parents: diff changeset	85 // subtypes.
a61af66fc99e Initial load duke parents: diff changeset	86 virtual bool card_will_be_scanned(jbyte cv) {
a61af66fc99e Initial load duke parents: diff changeset	87 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv);
a61af66fc99e Initial load duke parents: diff changeset	88 }
a61af66fc99e Initial load duke parents: diff changeset	89
a61af66fc99e Initial load duke parents: diff changeset	90 // Returns "true" iff the value "cv" may have represented a dirty card at
a61af66fc99e Initial load duke parents: diff changeset	91 // some point.
a61af66fc99e Initial load duke parents: diff changeset	92 virtual bool card_may_have_been_dirty(jbyte cv) {
a61af66fc99e Initial load duke parents: diff changeset	93 return card_is_dirty_wrt_gen_iter(cv);
a61af66fc99e Initial load duke parents: diff changeset	94 }
a61af66fc99e Initial load duke parents: diff changeset	95
a61af66fc99e Initial load duke parents: diff changeset	96 // The declaration order of these const fields is important; see the
a61af66fc99e Initial load duke parents: diff changeset	97 // constructor before changing.
a61af66fc99e Initial load duke parents: diff changeset	98 const MemRegion _whole_heap; // the region covered by the card table
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	99 size_t _guard_index; // index of very last element in the card
0 a61af66fc99e Initial load duke parents: diff changeset	100 // table; it is set to a guard value
a61af66fc99e Initial load duke parents: diff changeset	101 // (last_card) and should never be modified
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	102 size_t _last_valid_index; // index of the last valid element
0 a61af66fc99e Initial load duke parents: diff changeset	103 const size_t _page_size; // page size used when mapping _byte_map
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	104 size_t _byte_map_size; // in bytes
0 a61af66fc99e Initial load duke parents: diff changeset	105 jbyte* _byte_map; // the card marking array
a61af66fc99e Initial load duke parents: diff changeset	106
a61af66fc99e Initial load duke parents: diff changeset	107 int _cur_covered_regions;
a61af66fc99e Initial load duke parents: diff changeset	108 // The covered regions should be in address order.
a61af66fc99e Initial load duke parents: diff changeset	109 MemRegion* _covered;
a61af66fc99e Initial load duke parents: diff changeset	110 // The committed regions correspond one-to-one to the covered regions.
a61af66fc99e Initial load duke parents: diff changeset	111 // They represent the card-table memory that has been committed to service
a61af66fc99e Initial load duke parents: diff changeset	112 // the corresponding covered region. It may be that committed region for
a61af66fc99e Initial load duke parents: diff changeset	113 // one covered region corresponds to a larger region because of page-size
a61af66fc99e Initial load duke parents: diff changeset	114 // roundings. Thus, a committed region for one covered region may
a61af66fc99e Initial load duke parents: diff changeset	115 // actually extend onto the card-table space for the next covered region.
a61af66fc99e Initial load duke parents: diff changeset	116 MemRegion* _committed;
a61af66fc99e Initial load duke parents: diff changeset	117
a61af66fc99e Initial load duke parents: diff changeset	118 // The last card is a guard card, and we commit the page for it so
a61af66fc99e Initial load duke parents: diff changeset	119 // we can use the card for verification purposes. We make sure we never
a61af66fc99e Initial load duke parents: diff changeset	120 // uncommit the MemRegion for that page.
a61af66fc99e Initial load duke parents: diff changeset	121 MemRegion _guard_region;
a61af66fc99e Initial load duke parents: diff changeset	122
a61af66fc99e Initial load duke parents: diff changeset	123 protected:
a61af66fc99e Initial load duke parents: diff changeset	124 // Initialization utilities; covered_words is the size of the covered region
a61af66fc99e Initial load duke parents: diff changeset	125 // in, um, words.
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	126 inline size_t cards_required(size_t covered_words) {
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	127 // Add one for a guard card, used to detect errors.
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	128 const size_t words = align_size_up(covered_words, card_size_in_words);
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	129 return words / card_size_in_words + 1;
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	130 }
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	131
0 a61af66fc99e Initial load duke parents: diff changeset	132 inline size_t compute_byte_map_size();
a61af66fc99e Initial load duke parents: diff changeset	133
a61af66fc99e Initial load duke parents: diff changeset	134 // Finds and return the index of the region, if any, to which the given
a61af66fc99e Initial load duke parents: diff changeset	135 // region would be contiguous. If none exists, assign a new region and
a61af66fc99e Initial load duke parents: diff changeset	136 // returns its index. Requires that no more than the maximum number of
a61af66fc99e Initial load duke parents: diff changeset	137 // covered regions defined in the constructor are ever in use.
a61af66fc99e Initial load duke parents: diff changeset	138 int find_covering_region_by_base(HeapWord* base);
a61af66fc99e Initial load duke parents: diff changeset	139
a61af66fc99e Initial load duke parents: diff changeset	140 // Same as above, but finds the region containing the given address
a61af66fc99e Initial load duke parents: diff changeset	141 // instead of starting at a given base address.
a61af66fc99e Initial load duke parents: diff changeset	142 int find_covering_region_containing(HeapWord* addr);
a61af66fc99e Initial load duke parents: diff changeset	143
a61af66fc99e Initial load duke parents: diff changeset	144 // Resize one of the regions covered by the remembered set.
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	145 virtual void resize_covered_region(MemRegion new_region);
0 a61af66fc99e Initial load duke parents: diff changeset	146
a61af66fc99e Initial load duke parents: diff changeset	147 // Returns the leftmost end of a committed region corresponding to a
a61af66fc99e Initial load duke parents: diff changeset	148 // covered region before covered region "ind", or else "NULL" if "ind" is
a61af66fc99e Initial load duke parents: diff changeset	149 // the first covered region.
a61af66fc99e Initial load duke parents: diff changeset	150 HeapWord* largest_prev_committed_end(int ind) const;
a61af66fc99e Initial load duke parents: diff changeset	151
a61af66fc99e Initial load duke parents: diff changeset	152 // Returns the part of the region mr that doesn't intersect with
a61af66fc99e Initial load duke parents: diff changeset	153 // any committed region other than self. Used to prevent uncommitting
a61af66fc99e Initial load duke parents: diff changeset	154 // regions that are also committed by other regions. Also protects
a61af66fc99e Initial load duke parents: diff changeset	155 // against uncommitting the guard region.
a61af66fc99e Initial load duke parents: diff changeset	156 MemRegion committed_unique_to_self(int self, MemRegion mr) const;
a61af66fc99e Initial load duke parents: diff changeset	157
a61af66fc99e Initial load duke parents: diff changeset	158 // Mapping from address to card marking array entry
a61af66fc99e Initial load duke parents: diff changeset	159 jbyte* byte_for(const void* p) const {
a61af66fc99e Initial load duke parents: diff changeset	160 assert(_whole_heap.contains(p),
3359 7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	161 err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of "
7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	162 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 14443 diff changeset	163 p2i(p), p2i(_whole_heap.start()), p2i(_whole_heap.end())));
0 a61af66fc99e Initial load duke parents: diff changeset	164 jbyte* result = &byte_map_base[uintptr_t(p) >> card_shift];
a61af66fc99e Initial load duke parents: diff changeset	165 assert(result >= _byte_map && result < _byte_map + _byte_map_size,
a61af66fc99e Initial load duke parents: diff changeset	166 "out of bounds accessor for card marking array");
a61af66fc99e Initial load duke parents: diff changeset	167 return result;
a61af66fc99e Initial load duke parents: diff changeset	168 }
a61af66fc99e Initial load duke parents: diff changeset	169
a61af66fc99e Initial load duke parents: diff changeset	170 // The card table byte one after the card marking array
a61af66fc99e Initial load duke parents: diff changeset	171 // entry for argument address. Typically used for higher bounds
a61af66fc99e Initial load duke parents: diff changeset	172 // for loops iterating through the card table.
a61af66fc99e Initial load duke parents: diff changeset	173 jbyte* byte_after(const void* p) const {
a61af66fc99e Initial load duke parents: diff changeset	174 return byte_for(p) + 1;
a61af66fc99e Initial load duke parents: diff changeset	175 }
a61af66fc99e Initial load duke parents: diff changeset	176
a61af66fc99e Initial load duke parents: diff changeset	177 // Iterate over the portion of the card-table which covers the given
a61af66fc99e Initial load duke parents: diff changeset	178 // region mr in the given space and apply cl to any dirty sub-regions
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	179 // of mr. Dirty cards are _not_ cleared by the iterator method itself,
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	180 // but closures may arrange to do so on their own should they so wish.
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	181 void non_clean_card_iterate_serial(MemRegion mr, MemRegionClosure* cl);
0 a61af66fc99e Initial load duke parents: diff changeset	182
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	183 // A variant of the above that will operate in a parallel mode if
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	184 // worker threads are available, and clear the dirty cards as it
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	185 // processes them.
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	186 // XXX ??? MemRegionClosure above vs OopsInGenClosure below XXX
fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	187 // XXX some new_dcto_cl's take OopClosure's, plus as above there are
fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	188 // some MemRegionClosures. Clean this up everywhere. XXX
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	189 void non_clean_card_iterate_possibly_parallel(Space* sp, MemRegion mr,
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	190 OopsInGenClosure* cl, CardTableRS* ct);
0 a61af66fc99e Initial load duke parents: diff changeset	191
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	192 private:
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	193 // Work method used to implement non_clean_card_iterate_possibly_parallel()
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	194 // above in the parallel case.
c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	195 void non_clean_card_iterate_parallel_work(Space* sp, MemRegion mr,
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	196 OopsInGenClosure* cl, CardTableRS* ct,
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	197 int n_threads);
0 a61af66fc99e Initial load duke parents: diff changeset	198
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	199 protected:
0 a61af66fc99e Initial load duke parents: diff changeset	200 // Dirty the bytes corresponding to "mr" (not all of which must be
a61af66fc99e Initial load duke parents: diff changeset	201 // covered.)
a61af66fc99e Initial load duke parents: diff changeset	202 void dirty_MemRegion(MemRegion mr);
a61af66fc99e Initial load duke parents: diff changeset	203
a61af66fc99e Initial load duke parents: diff changeset	204 // Clear (to clean_card) the bytes entirely contained within "mr" (not
a61af66fc99e Initial load duke parents: diff changeset	205 // all of which must be covered.)
a61af66fc99e Initial load duke parents: diff changeset	206 void clear_MemRegion(MemRegion mr);
a61af66fc99e Initial load duke parents: diff changeset	207
a61af66fc99e Initial load duke parents: diff changeset	208 // *** Support for parallel card scanning.
a61af66fc99e Initial load duke parents: diff changeset	209
a61af66fc99e Initial load duke parents: diff changeset	210 // This is an array, one element per covered region of the card table.
a61af66fc99e Initial load duke parents: diff changeset	211 // Each entry is itself an array, with one element per chunk in the
a61af66fc99e Initial load duke parents: diff changeset	212 // covered region. Each entry of these arrays is the lowest non-clean
a61af66fc99e Initial load duke parents: diff changeset	213 // card of the corresponding chunk containing part of an object from the
a61af66fc99e Initial load duke parents: diff changeset	214 // previous chunk, or else NULL.
a61af66fc99e Initial load duke parents: diff changeset	215 typedef jbyte* CardPtr;
a61af66fc99e Initial load duke parents: diff changeset	216 typedef CardPtr* CardArr;
a61af66fc99e Initial load duke parents: diff changeset	217 CardArr* _lowest_non_clean;
a61af66fc99e Initial load duke parents: diff changeset	218 size_t* _lowest_non_clean_chunk_size;
a61af66fc99e Initial load duke parents: diff changeset	219 uintptr_t* _lowest_non_clean_base_chunk_index;
a61af66fc99e Initial load duke parents: diff changeset	220 int* _last_LNC_resizing_collection;
a61af66fc99e Initial load duke parents: diff changeset	221
a61af66fc99e Initial load duke parents: diff changeset	222 // Initializes "lowest_non_clean" to point to the array for the region
a61af66fc99e Initial load duke parents: diff changeset	223 // covering "sp", and "lowest_non_clean_base_chunk_index" to the chunk
a61af66fc99e Initial load duke parents: diff changeset	224 // index of the corresponding to the first element of that array.
a61af66fc99e Initial load duke parents: diff changeset	225 // Ensures that these arrays are of sufficient size, allocating if necessary.
a61af66fc99e Initial load duke parents: diff changeset	226 // May be called by several threads concurrently.
a61af66fc99e Initial load duke parents: diff changeset	227 void get_LNC_array_for_space(Space* sp,
a61af66fc99e Initial load duke parents: diff changeset	228 jbyte**& lowest_non_clean,
a61af66fc99e Initial load duke parents: diff changeset	229 uintptr_t& lowest_non_clean_base_chunk_index,
a61af66fc99e Initial load duke parents: diff changeset	230 size_t& lowest_non_clean_chunk_size);
a61af66fc99e Initial load duke parents: diff changeset	231
a61af66fc99e Initial load duke parents: diff changeset	232 // Returns the number of chunks necessary to cover "mr".
a61af66fc99e Initial load duke parents: diff changeset	233 size_t chunks_to_cover(MemRegion mr) {
a61af66fc99e Initial load duke parents: diff changeset	234 return (size_t)(addr_to_chunk_index(mr.last()) -
a61af66fc99e Initial load duke parents: diff changeset	235 addr_to_chunk_index(mr.start()) + 1);
a61af66fc99e Initial load duke parents: diff changeset	236 }
a61af66fc99e Initial load duke parents: diff changeset	237
a61af66fc99e Initial load duke parents: diff changeset	238 // Returns the index of the chunk in a stride which
a61af66fc99e Initial load duke parents: diff changeset	239 // covers the given address.
a61af66fc99e Initial load duke parents: diff changeset	240 uintptr_t addr_to_chunk_index(const void* addr) {
a61af66fc99e Initial load duke parents: diff changeset	241 uintptr_t card = (uintptr_t) byte_for(addr);
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	242 return card / ParGCCardsPerStrideChunk;
0 a61af66fc99e Initial load duke parents: diff changeset	243 }
a61af66fc99e Initial load duke parents: diff changeset	244
a61af66fc99e Initial load duke parents: diff changeset	245 // Apply cl, which must either itself apply dcto_cl or be dcto_cl,
a61af66fc99e Initial load duke parents: diff changeset	246 // to the cards in the stride (of n_strides) within the given space.
a61af66fc99e Initial load duke parents: diff changeset	247 void process_stride(Space* sp,
a61af66fc99e Initial load duke parents: diff changeset	248 MemRegion used,
a61af66fc99e Initial load duke parents: diff changeset	249 jint stride, int n_strides,
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	250 OopsInGenClosure* cl,
fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	251 CardTableRS* ct,
0 a61af66fc99e Initial load duke parents: diff changeset	252 jbyte** lowest_non_clean,
a61af66fc99e Initial load duke parents: diff changeset	253 uintptr_t lowest_non_clean_base_chunk_index,
a61af66fc99e Initial load duke parents: diff changeset	254 size_t lowest_non_clean_chunk_size);
a61af66fc99e Initial load duke parents: diff changeset	255
a61af66fc99e Initial load duke parents: diff changeset	256 // Makes sure that chunk boundaries are handled appropriately, by
a61af66fc99e Initial load duke parents: diff changeset	257 // adjusting the min_done of dcto_cl, and by using a special card-table
a61af66fc99e Initial load duke parents: diff changeset	258 // value to indicate how min_done should be set.
a61af66fc99e Initial load duke parents: diff changeset	259 void process_chunk_boundaries(Space* sp,
a61af66fc99e Initial load duke parents: diff changeset	260 DirtyCardToOopClosure* dcto_cl,
a61af66fc99e Initial load duke parents: diff changeset	261 MemRegion chunk_mr,
a61af66fc99e Initial load duke parents: diff changeset	262 MemRegion used,
a61af66fc99e Initial load duke parents: diff changeset	263 jbyte** lowest_non_clean,
a61af66fc99e Initial load duke parents: diff changeset	264 uintptr_t lowest_non_clean_base_chunk_index,
a61af66fc99e Initial load duke parents: diff changeset	265 size_t lowest_non_clean_chunk_size);
a61af66fc99e Initial load duke parents: diff changeset	266
a61af66fc99e Initial load duke parents: diff changeset	267 public:
a61af66fc99e Initial load duke parents: diff changeset	268 // Constants
a61af66fc99e Initial load duke parents: diff changeset	269 enum SomePublicConstants {
a61af66fc99e Initial load duke parents: diff changeset	270 card_shift = 9,
a61af66fc99e Initial load duke parents: diff changeset	271 card_size = 1 << card_shift,
a61af66fc99e Initial load duke parents: diff changeset	272 card_size_in_words = card_size / sizeof(HeapWord)
a61af66fc99e Initial load duke parents: diff changeset	273 };
a61af66fc99e Initial load duke parents: diff changeset	274
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	275 static int clean_card_val() { return clean_card; }
616 4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	276 static int clean_card_mask_val() { return clean_card_mask; }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	277 static int dirty_card_val() { return dirty_card; }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	278 static int claimed_card_val() { return claimed_card; }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	279 static int precleaned_card_val() { return precleaned_card; }
616 4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	280 static int deferred_card_val() { return deferred_card; }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	281
0 a61af66fc99e Initial load duke parents: diff changeset	282 // For RTTI simulation.
a61af66fc99e Initial load duke parents: diff changeset	283 bool is_a(BarrierSet::Name bsn) {
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	284 return bsn == BarrierSet::CardTableModRef \|\| ModRefBarrierSet::is_a(bsn);
0 a61af66fc99e Initial load duke parents: diff changeset	285 }
a61af66fc99e Initial load duke parents: diff changeset	286
a61af66fc99e Initial load duke parents: diff changeset	287 CardTableModRefBS(MemRegion whole_heap, int max_covered_regions);
10271 f9be75d21404 8012902: remove use of global operator new - take 2 minqi parents: 10135 diff changeset	288 ~CardTableModRefBS();
0 a61af66fc99e Initial load duke parents: diff changeset	289
20337 1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	290 virtual void initialize();
1f1d373cd044 8038423: G1: Decommit memory within heap tschatzl parents: 17937 diff changeset	291
0 a61af66fc99e Initial load duke parents: diff changeset	292 // *** Barrier set functions.
a61af66fc99e Initial load duke parents: diff changeset	293
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	294 bool has_write_ref_pre_barrier() { return false; }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	295
0 a61af66fc99e Initial load duke parents: diff changeset	296 // Record a reference update. Note that these versions are precise!
a61af66fc99e Initial load duke parents: diff changeset	297 // The scanning code has to handle the fact that the write barrier may be
a61af66fc99e Initial load duke parents: diff changeset	298 // either precise or imprecise. We make non-virtual inline variants of
a61af66fc99e Initial load duke parents: diff changeset	299 // these functions here for performance.
a61af66fc99e Initial load duke parents: diff changeset	300 protected:
a61af66fc99e Initial load duke parents: diff changeset	301 void write_ref_field_work(oop obj, size_t offset, oop newVal);
14443 3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	302 virtual void write_ref_field_work(void* field, oop newVal, bool release = false);
0 a61af66fc99e Initial load duke parents: diff changeset	303 public:
a61af66fc99e Initial load duke parents: diff changeset	304
a61af66fc99e Initial load duke parents: diff changeset	305 bool has_write_ref_array_opt() { return true; }
a61af66fc99e Initial load duke parents: diff changeset	306 bool has_write_region_opt() { return true; }
a61af66fc99e Initial load duke parents: diff changeset	307
a61af66fc99e Initial load duke parents: diff changeset	308 inline void inline_write_region(MemRegion mr) {
a61af66fc99e Initial load duke parents: diff changeset	309 dirty_MemRegion(mr);
a61af66fc99e Initial load duke parents: diff changeset	310 }
a61af66fc99e Initial load duke parents: diff changeset	311 protected:
a61af66fc99e Initial load duke parents: diff changeset	312 void write_region_work(MemRegion mr) {
a61af66fc99e Initial load duke parents: diff changeset	313 inline_write_region(mr);
a61af66fc99e Initial load duke parents: diff changeset	314 }
a61af66fc99e Initial load duke parents: diff changeset	315 public:
a61af66fc99e Initial load duke parents: diff changeset	316
a61af66fc99e Initial load duke parents: diff changeset	317 inline void inline_write_ref_array(MemRegion mr) {
a61af66fc99e Initial load duke parents: diff changeset	318 dirty_MemRegion(mr);
a61af66fc99e Initial load duke parents: diff changeset	319 }
a61af66fc99e Initial load duke parents: diff changeset	320 protected:
a61af66fc99e Initial load duke parents: diff changeset	321 void write_ref_array_work(MemRegion mr) {
a61af66fc99e Initial load duke parents: diff changeset	322 inline_write_ref_array(mr);
a61af66fc99e Initial load duke parents: diff changeset	323 }
a61af66fc99e Initial load duke parents: diff changeset	324 public:
a61af66fc99e Initial load duke parents: diff changeset	325
a61af66fc99e Initial load duke parents: diff changeset	326 bool is_aligned(HeapWord* addr) {
a61af66fc99e Initial load duke parents: diff changeset	327 return is_card_aligned(addr);
a61af66fc99e Initial load duke parents: diff changeset	328 }
a61af66fc99e Initial load duke parents: diff changeset	329
a61af66fc99e Initial load duke parents: diff changeset	330 // *** Card-table-barrier-specific things.
a61af66fc99e Initial load duke parents: diff changeset	331
845 df6caf649ff7 6700789: G1: Enable use of compressed oops with G1 heaps ysr parents: 628 diff changeset	332 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {}
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	333
14443 3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	334 template <class T> inline void inline_write_ref_field(T* field, oop newVal, bool release) {
845 df6caf649ff7 6700789: G1: Enable use of compressed oops with G1 heaps ysr parents: 628 diff changeset	335 jbyte* byte = byte_for((void*)field);
14443 3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	336 if (release) {
3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	337 // Perform a releasing store if requested.
3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	338 OrderAccess::release_store((volatile jbyte*) byte, dirty_card);
3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	339 } else {
3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	340 *byte = dirty_card;
3205e78d8193 8029396: PPC64 (part 212): Several memory ordering fixes in C-code. goetz parents: 12343 diff changeset	341 }
0 a61af66fc99e Initial load duke parents: diff changeset	342 }
a61af66fc99e Initial load duke parents: diff changeset	343
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	344 // These are used by G1, when it uses the card table as a temporary data
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	345 // structure for card claiming.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	346 bool is_card_dirty(size_t card_index) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	347 return _byte_map[card_index] == dirty_card_val();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	348 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	349
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	350 void mark_card_dirty(size_t card_index) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	351 _byte_map[card_index] = dirty_card_val();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	352 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	353
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	354 bool is_card_clean(size_t card_index) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	355 return _byte_map[card_index] == clean_card_val();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	356 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	357
0 a61af66fc99e Initial load duke parents: diff changeset	358 // Card marking array base (adjusted for heap low boundary)
a61af66fc99e Initial load duke parents: diff changeset	359 // This would be the 0th element of _byte_map, if the heap started at 0x0.
a61af66fc99e Initial load duke parents: diff changeset	360 // But since the heap starts at some higher address, this points to somewhere
a61af66fc99e Initial load duke parents: diff changeset	361 // before the beginning of the actual _byte_map.
a61af66fc99e Initial load duke parents: diff changeset	362 jbyte* byte_map_base;
a61af66fc99e Initial load duke parents: diff changeset	363
a61af66fc99e Initial load duke parents: diff changeset	364 // Return true if "p" is at the start of a card.
a61af66fc99e Initial load duke parents: diff changeset	365 bool is_card_aligned(HeapWord* p) {
a61af66fc99e Initial load duke parents: diff changeset	366 jbyte* pcard = byte_for(p);
a61af66fc99e Initial load duke parents: diff changeset	367 return (addr_for(pcard) == p);
a61af66fc99e Initial load duke parents: diff changeset	368 }
a61af66fc99e Initial load duke parents: diff changeset	369
2433 abdfc822206f 7023069: G1: Introduce symmetric locking in the slow allocation path tonyp parents: 1972 diff changeset	370 HeapWord* align_to_card_boundary(HeapWord* p) {
abdfc822206f 7023069: G1: Introduce symmetric locking in the slow allocation path tonyp parents: 1972 diff changeset	371 jbyte* pcard = byte_for(p + card_size_in_words - 1);
abdfc822206f 7023069: G1: Introduce symmetric locking in the slow allocation path tonyp parents: 1972 diff changeset	372 return addr_for(pcard);
abdfc822206f 7023069: G1: Introduce symmetric locking in the slow allocation path tonyp parents: 1972 diff changeset	373 }
abdfc822206f 7023069: G1: Introduce symmetric locking in the slow allocation path tonyp parents: 1972 diff changeset	374
0 a61af66fc99e Initial load duke parents: diff changeset	375 // The kinds of precision a CardTableModRefBS may offer.
a61af66fc99e Initial load duke parents: diff changeset	376 enum PrecisionStyle {
a61af66fc99e Initial load duke parents: diff changeset	377 Precise,
a61af66fc99e Initial load duke parents: diff changeset	378 ObjHeadPreciseArray
a61af66fc99e Initial load duke parents: diff changeset	379 };
a61af66fc99e Initial load duke parents: diff changeset	380
a61af66fc99e Initial load duke parents: diff changeset	381 // Tells what style of precision this card table offers.
a61af66fc99e Initial load duke parents: diff changeset	382 PrecisionStyle precision() {
a61af66fc99e Initial load duke parents: diff changeset	383 return ObjHeadPreciseArray; // Only one supported for now.
a61af66fc99e Initial load duke parents: diff changeset	384 }
a61af66fc99e Initial load duke parents: diff changeset	385
a61af66fc99e Initial load duke parents: diff changeset	386 // ModRefBS functions.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	387 virtual void invalidate(MemRegion mr, bool whole_heap = false);
0 a61af66fc99e Initial load duke parents: diff changeset	388 void clear(MemRegion mr);
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	389 void dirty(MemRegion mr);
0 a61af66fc99e Initial load duke parents: diff changeset	390
a61af66fc99e Initial load duke parents: diff changeset	391 // *** Card-table-RemSet-specific things.
a61af66fc99e Initial load duke parents: diff changeset	392
a61af66fc99e Initial load duke parents: diff changeset	393 // Invoke "cl.do_MemRegion" on a set of MemRegions that collectively
a61af66fc99e Initial load duke parents: diff changeset	394 // includes all the modified cards (expressing each card as a
a61af66fc99e Initial load duke parents: diff changeset	395 // MemRegion). Thus, several modified cards may be lumped into one
a61af66fc99e Initial load duke parents: diff changeset	396 // region. The regions are non-overlapping, and are visited in
a61af66fc99e Initial load duke parents: diff changeset	397 // decreasing address order. (This order aids with imprecise card
a61af66fc99e Initial load duke parents: diff changeset	398 // marking, where a dirty card may cause scanning, and summarization
a61af66fc99e Initial load duke parents: diff changeset	399 // marking, of objects that extend onto subsequent cards.)
3256 c69b1043dfb1 7036482: clear argument is redundant and unused in cardtable methods ysr parents: 2433 diff changeset	400 void mod_card_iterate(MemRegionClosure* cl) {
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	401 non_clean_card_iterate_serial(_whole_heap, cl);
0 a61af66fc99e Initial load duke parents: diff changeset	402 }
a61af66fc99e Initial load duke parents: diff changeset	403
a61af66fc99e Initial load duke parents: diff changeset	404 // Like the "mod_cards_iterate" above, except only invokes the closure
a61af66fc99e Initial load duke parents: diff changeset	405 // for cards within the MemRegion "mr" (which is required to be
a61af66fc99e Initial load duke parents: diff changeset	406 // card-aligned and sized.)
3256 c69b1043dfb1 7036482: clear argument is redundant and unused in cardtable methods ysr parents: 2433 diff changeset	407 void mod_card_iterate(MemRegion mr, MemRegionClosure* cl) {
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	408 non_clean_card_iterate_serial(mr, cl);
0 a61af66fc99e Initial load duke parents: diff changeset	409 }
a61af66fc99e Initial load duke parents: diff changeset	410
a61af66fc99e Initial load duke parents: diff changeset	411 static uintx ct_max_alignment_constraint();
a61af66fc99e Initial load duke parents: diff changeset	412
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	413 // Apply closure "cl" to the dirty cards containing some part of
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	414 // MemRegion "mr".
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	415 void dirty_card_iterate(MemRegion mr, MemRegionClosure* cl);
0 a61af66fc99e Initial load duke parents: diff changeset	416
a61af66fc99e Initial load duke parents: diff changeset	417 // Return the MemRegion corresponding to the first maximal run
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	418 // of dirty cards lying completely within MemRegion mr.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	419 // If reset is "true", then sets those card table entries to the given
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	420 // value.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	421 MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	422 int reset_val);
0 a61af66fc99e Initial load duke parents: diff changeset	423
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	424 // Provide read-only access to the card table array.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	425 const jbyte* byte_for_const(const void* p) const {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	426 return byte_for(p);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	427 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	428 const jbyte* byte_after_const(const void* p) const {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	429 return byte_after(p);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	430 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	431
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	432 // Mapping from card marking array entry to address of first word
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	433 HeapWord* addr_for(const jbyte* p) const {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	434 assert(p >= _byte_map && p < _byte_map + _byte_map_size,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	435 "out of bounds access to card marking array");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	436 size_t delta = pointer_delta(p, byte_map_base, sizeof(jbyte));
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	437 HeapWord* result = (HeapWord*) (delta << card_shift);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	438 assert(_whole_heap.contains(result),
3359 7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	439 err_msg("Returning result = "PTR_FORMAT" out of bounds of "
7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	440 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 14443 diff changeset	441 p2i(result), p2i(_whole_heap.start()), p2i(_whole_heap.end())));
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	442 return result;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	443 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	444
0 a61af66fc99e Initial load duke parents: diff changeset	445 // Mapping from address to card marking array index.
489 2494ab195856 6653214: MemoryPoolMXBean.setUsageThreshold() does not support large heap sizes. swamyv parents: 356 diff changeset	446 size_t index_for(void* p) {
0 a61af66fc99e Initial load duke parents: diff changeset	447 assert(_whole_heap.contains(p),
3359 7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	448 err_msg("Attempt to access p = "PTR_FORMAT" out of bounds of "
7d64aa23eb96 7043891: CMS: assert(_whole_heap.contains(p)) failed: out of bounds access to card marking array ysr parents: 3357 diff changeset	449 " card marking array's _whole_heap = ["PTR_FORMAT","PTR_FORMAT")",
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 14443 diff changeset	450 p2i(p), p2i(_whole_heap.start()), p2i(_whole_heap.end())));
0 a61af66fc99e Initial load duke parents: diff changeset	451 return byte_for(p) - _byte_map;
a61af66fc99e Initial load duke parents: diff changeset	452 }
a61af66fc99e Initial load duke parents: diff changeset	453
616 4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	454 const jbyte* byte_for_index(const size_t card_index) const {
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	455 return _byte_map + card_index;
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	456 }
4f360ec815ba 6720309: G1: don't synchronously update RSet during evacuation pauses iveresov parents: 489 diff changeset	457
5984 fd09f2d8283e 7157141: crash in 64 bit with corrupted oops never parents: 5939 diff changeset	458 // Print a description of the memory for the barrier set
fd09f2d8283e 7157141: crash in 64 bit with corrupted oops never parents: 5939 diff changeset	459 virtual void print_on(outputStream* st) const;
fd09f2d8283e 7157141: crash in 64 bit with corrupted oops never parents: 5939 diff changeset	460
0 a61af66fc99e Initial load duke parents: diff changeset	461 void verify();
a61af66fc99e Initial load duke parents: diff changeset	462 void verify_guard();
a61af66fc99e Initial load duke parents: diff changeset	463
3317 063382f9b575 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...) tonyp parents: 3287 diff changeset	464 // val_equals -> it will check that all cards covered by mr equal val
063382f9b575 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...) tonyp parents: 3287 diff changeset	465 // !val_equals -> it will check that all cards covered by mr do not equal val
063382f9b575 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...) tonyp parents: 3287 diff changeset	466 void verify_region(MemRegion mr, jbyte val, bool val_equals) PRODUCT_RETURN;
063382f9b575 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...) tonyp parents: 3287 diff changeset	467 void verify_not_dirty_region(MemRegion mr) PRODUCT_RETURN;
940 8624da129f0b 6841313: G1: dirty cards of survivor regions in parallel apetrusenko parents: 845 diff changeset	468 void verify_dirty_region(MemRegion mr) PRODUCT_RETURN;
0 a61af66fc99e Initial load duke parents: diff changeset	469
a61af66fc99e Initial load duke parents: diff changeset	470 static size_t par_chunk_heapword_alignment() {
3357 fc2b798ab316 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests ysr parents: 3317 diff changeset	471 return ParGCCardsPerStrideChunk * card_size_in_words;
0 a61af66fc99e Initial load duke parents: diff changeset	472 }
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	473
0 a61af66fc99e Initial load duke parents: diff changeset	474 };
a61af66fc99e Initial load duke parents: diff changeset	475
a61af66fc99e Initial load duke parents: diff changeset	476 class CardTableRS;
a61af66fc99e Initial load duke parents: diff changeset	477
a61af66fc99e Initial load duke parents: diff changeset	478 // A specialization for the CardTableRS gen rem set.
a61af66fc99e Initial load duke parents: diff changeset	479 class CardTableModRefBSForCTRS: public CardTableModRefBS {
a61af66fc99e Initial load duke parents: diff changeset	480 CardTableRS* _rs;
a61af66fc99e Initial load duke parents: diff changeset	481 protected:
a61af66fc99e Initial load duke parents: diff changeset	482 bool card_will_be_scanned(jbyte cv);
a61af66fc99e Initial load duke parents: diff changeset	483 bool card_may_have_been_dirty(jbyte cv);
a61af66fc99e Initial load duke parents: diff changeset	484 public:
a61af66fc99e Initial load duke parents: diff changeset	485 CardTableModRefBSForCTRS(MemRegion whole_heap,
a61af66fc99e Initial load duke parents: diff changeset	486 int max_covered_regions) :
a61af66fc99e Initial load duke parents: diff changeset	487 CardTableModRefBS(whole_heap, max_covered_regions) {}
a61af66fc99e Initial load duke parents: diff changeset	488
a61af66fc99e Initial load duke parents: diff changeset	489 void set_CTRS(CardTableRS* rs) { _rs = rs; }
a61af66fc99e Initial load duke parents: diff changeset	490 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	491
3287 c48ad6ab8bdf 7037276: Unnecessary double traversal of dirty card windows ysr parents: 3256 diff changeset	492
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1692 diff changeset	493 #endif // SHARE_VM_MEMORY_CARDTABLEMODREFBS_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/cardTableModRefBS.hpp @ 20337:1f1d373cd044