Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | 1fdb98a17101 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_parMarkBitMap.cpp.incl" | |
| 27 | |
| 28 bool | |
| 29 ParMarkBitMap::initialize(MemRegion covered_region) | |
| 30 { | |
| 31 const idx_t bits = bits_required(covered_region); | |
| 32 // The bits will be divided evenly between two bitmaps; each of them should be | |
| 33 // an integral number of words. | |
| 34 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
| 35 | |
| 36 const size_t words = bits / BitsPerWord; | |
| 37 const size_t raw_bytes = words * sizeof(idx_t); | |
| 38 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
| 39 const size_t granularity = os::vm_allocation_granularity(); | |
| 40 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
| 41 | |
| 42 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
| 43 MAX2(page_sz, granularity); | |
|
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44 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
| 0 | 45 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
| 46 rs.base(), rs.size()); | |
| 47 _virtual_space = new PSVirtualSpace(rs, page_sz); | |
| 48 if (_virtual_space != NULL && _virtual_space->expand_by(bytes)) { | |
| 49 _region_start = covered_region.start(); | |
| 50 _region_size = covered_region.word_size(); | |
| 51 idx_t* map = (idx_t*)_virtual_space->reserved_low_addr(); | |
| 52 _beg_bits.set_map(map); | |
| 53 _beg_bits.set_size(bits / 2); | |
| 54 _end_bits.set_map(map + words / 2); | |
| 55 _end_bits.set_size(bits / 2); | |
| 56 return true; | |
| 57 } | |
| 58 | |
| 59 _region_start = 0; | |
| 60 _region_size = 0; | |
| 61 if (_virtual_space != NULL) { | |
| 62 delete _virtual_space; | |
| 63 _virtual_space = NULL; | |
|
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64 // Release memory reserved in the space. |
|
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65 rs.release(); |
| 0 | 66 } |
| 67 return false; | |
| 68 } | |
| 69 | |
| 70 #ifdef ASSERT | |
| 71 extern size_t mark_bitmap_count; | |
| 72 extern size_t mark_bitmap_size; | |
| 73 #endif // #ifdef ASSERT | |
| 74 | |
| 75 bool | |
| 76 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
| 77 { | |
| 78 const idx_t beg_bit = addr_to_bit(addr); | |
| 79 if (_beg_bits.par_set_bit(beg_bit)) { | |
| 80 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
| 81 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
| 82 assert(end_bit_ok, "concurrency problem"); | |
| 83 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
| 84 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
| 85 return true; | |
| 86 } | |
| 87 return false; | |
| 88 } | |
| 89 | |
| 90 size_t | |
| 91 ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, HeapWord* end_addr) const | |
| 92 { | |
| 93 assert(beg_addr <= end_addr, "bad range"); | |
| 94 | |
| 95 idx_t live_bits = 0; | |
| 96 | |
| 97 // The bitmap routines require the right boundary to be word-aligned. | |
| 98 const idx_t end_bit = addr_to_bit(end_addr); | |
| 99 const idx_t range_end = BitMap::word_align_up(end_bit); | |
| 100 | |
| 101 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
| 102 while (beg_bit < end_bit) { | |
| 103 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
| 104 if (tmp_end < end_bit) { | |
| 105 live_bits += tmp_end - beg_bit + 1; | |
| 106 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
| 107 } else { | |
| 108 live_bits += end_bit - beg_bit; // No + 1 here; end_bit is not counted. | |
| 109 return bits_to_words(live_bits); | |
| 110 } | |
| 111 } | |
| 112 return bits_to_words(live_bits); | |
| 113 } | |
| 114 | |
| 115 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
| 116 { | |
| 117 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
| 118 assert(is_marked(end_obj), "end_obj must be live"); | |
| 119 | |
| 120 idx_t live_bits = 0; | |
| 121 | |
| 122 // The bitmap routines require the right boundary to be word-aligned. | |
| 123 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
| 124 const idx_t range_end = BitMap::word_align_up(end_bit); | |
| 125 | |
| 126 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
| 127 while (beg_bit < end_bit) { | |
| 128 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
| 129 assert(tmp_end < end_bit, "missing end bit"); | |
| 130 live_bits += tmp_end - beg_bit + 1; | |
| 131 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
| 132 } | |
| 133 return bits_to_words(live_bits); | |
| 134 } | |
| 135 | |
| 136 ParMarkBitMap::IterationStatus | |
| 137 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 138 idx_t range_beg, idx_t range_end) const | |
| 139 { | |
| 140 DEBUG_ONLY(verify_bit(range_beg);) | |
| 141 DEBUG_ONLY(verify_bit(range_end);) | |
| 142 assert(range_beg <= range_end, "live range invalid"); | |
| 143 | |
| 144 // The bitmap routines require the right boundary to be word-aligned. | |
| 145 const idx_t search_end = BitMap::word_align_up(range_end); | |
| 146 | |
| 147 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
| 148 while (cur_beg < range_end) { | |
| 149 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
| 150 if (cur_end >= range_end) { | |
| 151 // The obj ends outside the range. | |
| 152 live_closure->set_source(bit_to_addr(cur_beg)); | |
| 153 return incomplete; | |
| 154 } | |
| 155 | |
| 156 const size_t size = obj_size(cur_beg, cur_end); | |
| 157 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
| 158 if (status != incomplete) { | |
| 159 assert(status == would_overflow || status == full, "sanity"); | |
| 160 return status; | |
| 161 } | |
| 162 | |
| 163 // Successfully processed the object; look for the next object. | |
| 164 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
| 165 } | |
| 166 | |
| 167 live_closure->set_source(bit_to_addr(range_end)); | |
| 168 return complete; | |
| 169 } | |
| 170 | |
| 171 ParMarkBitMap::IterationStatus | |
| 172 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 173 ParMarkBitMapClosure* dead_closure, | |
| 174 idx_t range_beg, idx_t range_end, | |
| 175 idx_t dead_range_end) const | |
| 176 { | |
| 177 DEBUG_ONLY(verify_bit(range_beg);) | |
| 178 DEBUG_ONLY(verify_bit(range_end);) | |
| 179 DEBUG_ONLY(verify_bit(dead_range_end);) | |
| 180 assert(range_beg <= range_end, "live range invalid"); | |
| 181 assert(range_end <= dead_range_end, "dead range invalid"); | |
| 182 | |
| 183 // The bitmap routines require the right boundary to be word-aligned. | |
| 184 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
| 185 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
| 186 | |
| 187 idx_t cur_beg = range_beg; | |
| 188 if (range_beg < range_end && is_unmarked(range_beg)) { | |
| 189 // The range starts with dead space. Look for the next object, then fill. | |
| 190 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
| 191 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
| 192 const size_t size = obj_size(range_beg, dead_space_end); | |
| 193 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
| 194 } | |
| 195 | |
| 196 while (cur_beg < range_end) { | |
| 197 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
| 198 if (cur_end >= range_end) { | |
| 199 // The obj ends outside the range. | |
| 200 live_closure->set_source(bit_to_addr(cur_beg)); | |
| 201 return incomplete; | |
| 202 } | |
| 203 | |
| 204 const size_t size = obj_size(cur_beg, cur_end); | |
| 205 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
| 206 if (status != incomplete) { | |
| 207 assert(status == would_overflow || status == full, "sanity"); | |
| 208 return status; | |
| 209 } | |
| 210 | |
| 211 // Look for the start of the next object. | |
| 212 const idx_t dead_space_beg = cur_end + 1; | |
| 213 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
| 214 if (cur_beg > dead_space_beg) { | |
| 215 // Found dead space; compute the size and invoke the dead closure. | |
| 216 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
| 217 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
| 218 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 live_closure->set_source(bit_to_addr(range_end)); | |
| 223 return complete; | |
| 224 } | |
| 225 | |
| 226 #ifndef PRODUCT | |
| 227 void ParMarkBitMap::reset_counters() | |
| 228 { | |
| 229 _cas_tries = _cas_retries = _cas_by_another = 0; | |
| 230 } | |
| 231 #endif // #ifndef PRODUCT | |
| 232 | |
| 233 #ifdef ASSERT | |
| 234 void ParMarkBitMap::verify_clear() const | |
| 235 { | |
| 236 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
| 237 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
| 238 for (const idx_t* p = beg; p < end; ++p) { | |
| 239 assert(*p == 0, "bitmap not clear"); | |
| 240 } | |
| 241 } | |
| 242 #endif // #ifdef ASSERT |