Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20652:e8bf410d5e23
8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs
Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view
Reviewed-by: brutisso, dcubed, dholmes, stefank
| author | mgerdin |
|---|---|
| date | Fri, 14 Nov 2014 14:23:25 +0100 |
| parents | 0fcaab91d485 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 12080 | 26 #include "code/nmethod.hpp" |
| 1972 | 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
| 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
| 20423 | 31 #include "gc_implementation/g1/heapRegionBounds.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
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33 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
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34 #include "gc_implementation/shared/liveRange.hpp" |
| 1972 | 35 #include "memory/genOopClosures.inline.hpp" |
| 36 #include "memory/iterator.hpp" | |
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37 #include "memory/space.inline.hpp" |
| 1972 | 38 #include "oops/oop.inline.hpp" |
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39 #include "runtime/orderAccess.inline.hpp" |
| 342 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
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43 int HeapRegion::LogOfHRGrainBytes = 0; |
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44 int HeapRegion::LogOfHRGrainWords = 0; |
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45 size_t HeapRegion::GrainBytes = 0; |
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46 size_t HeapRegion::GrainWords = 0; |
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47 size_t HeapRegion::CardsPerRegion = 0; |
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48 |
| 342 | 49 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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50 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 51 CardTableModRefBS::PrecisionStyle precision, |
| 52 FilterKind fk) : | |
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53 DirtyCardToOopClosure(hr, cl, precision, NULL), |
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54 _hr(hr), _fk(fk), _g1(g1) { } |
| 342 | 55 |
| 56 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 57 OopClosure* oc) : | |
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58 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
| 342 | 59 |
| 60 template<class ClosureType> | |
| 61 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 62 HeapRegion* hr, | |
| 63 HeapWord* cur, HeapWord* top) { | |
| 64 oop cur_oop = oop(cur); | |
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65 size_t oop_size = hr->block_size(cur); |
| 342 | 66 HeapWord* next_obj = cur + oop_size; |
| 67 while (next_obj < top) { | |
| 68 // Keep filtering the remembered set. | |
| 69 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 70 // Bottom lies entirely below top, so we can call the | |
| 71 // non-memRegion version of oop_iterate below. | |
| 72 cur_oop->oop_iterate(cl); | |
| 73 } | |
| 74 cur = next_obj; | |
| 75 cur_oop = oop(cur); | |
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76 oop_size = hr->block_size(cur); |
| 342 | 77 next_obj = cur + oop_size; |
| 78 } | |
| 79 return cur; | |
| 80 } | |
| 81 | |
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82 void HeapRegionDCTOC::walk_mem_region(MemRegion mr, |
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83 HeapWord* bottom, |
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84 HeapWord* top) { |
| 342 | 85 G1CollectedHeap* g1h = _g1; |
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86 size_t oop_size; |
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87 ExtendedOopClosure* cl2 = NULL; |
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88 |
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89 FilterIntoCSClosure intoCSFilt(this, g1h, _cl); |
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90 FilterOutOfRegionClosure outOfRegionFilt(_hr, _cl); |
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91 |
| 342 | 92 switch (_fk) { |
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93 case NoFilterKind: cl2 = _cl; break; |
| 342 | 94 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
| 95 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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96 default: ShouldNotReachHere(); |
| 342 | 97 } |
| 98 | |
| 99 // Start filtering what we add to the remembered set. If the object is | |
| 100 // not considered dead, either because it is marked (in the mark bitmap) | |
| 101 // or it was allocated after marking finished, then we add it. Otherwise | |
| 102 // we can safely ignore the object. | |
| 103 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 104 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 105 } else { | |
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106 oop_size = _hr->block_size(bottom); |
| 342 | 107 } |
| 108 | |
| 109 bottom += oop_size; | |
| 110 | |
| 111 if (bottom < top) { | |
| 112 // We replicate the loop below for several kinds of possible filters. | |
| 113 switch (_fk) { | |
| 114 case NoFilterKind: | |
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115 bottom = walk_mem_region_loop(_cl, g1h, _hr, bottom, top); |
| 342 | 116 break; |
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117 |
| 342 | 118 case IntoCSFilterKind: { |
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119 FilterIntoCSClosure filt(this, g1h, _cl); |
| 342 | 120 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 121 break; | |
| 122 } | |
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123 |
| 342 | 124 case OutOfRegionFilterKind: { |
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125 FilterOutOfRegionClosure filt(_hr, _cl); |
| 342 | 126 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 127 break; | |
| 128 } | |
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129 |
| 342 | 130 default: |
| 131 ShouldNotReachHere(); | |
| 132 } | |
| 133 | |
| 134 // Last object. Need to do dead-obj filtering here too. | |
| 135 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 136 oop(bottom)->oop_iterate(cl2, mr); | |
| 137 } | |
| 138 } | |
| 139 } | |
| 140 | |
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141 size_t HeapRegion::max_region_size() { |
| 20423 | 142 return HeapRegionBounds::max_size(); |
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143 } |
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144 |
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145 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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146 uintx region_size = G1HeapRegionSize; |
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147 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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148 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
| 20423 | 149 region_size = MAX2(average_heap_size / HeapRegionBounds::target_number(), |
| 150 (uintx) HeapRegionBounds::min_size()); | |
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151 } |
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152 |
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153 int region_size_log = log2_long((jlong) region_size); |
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154 // Recalculate the region size to make sure it's a power of |
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155 // 2. This means that region_size is the largest power of 2 that's |
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156 // <= what we've calculated so far. |
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157 region_size = ((uintx)1 << region_size_log); |
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158 |
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159 // Now make sure that we don't go over or under our limits. |
| 20423 | 160 if (region_size < HeapRegionBounds::min_size()) { |
| 161 region_size = HeapRegionBounds::min_size(); | |
| 162 } else if (region_size > HeapRegionBounds::max_size()) { | |
| 163 region_size = HeapRegionBounds::max_size(); | |
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164 } |
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165 |
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166 // And recalculate the log. |
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167 region_size_log = log2_long((jlong) region_size); |
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168 |
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169 // Now, set up the globals. |
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170 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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171 LogOfHRGrainBytes = region_size_log; |
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172 |
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173 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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174 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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175 |
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176 guarantee(GrainBytes == 0, "we should only set it once"); |
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177 // The cast to int is safe, given that we've bounded region_size by |
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178 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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179 GrainBytes = (size_t)region_size; |
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180 |
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181 guarantee(GrainWords == 0, "we should only set it once"); |
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182 GrainWords = GrainBytes >> LogHeapWordSize; |
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183 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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184 |
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185 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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186 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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187 } |
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188 |
| 342 | 189 void HeapRegion::reset_after_compaction() { |
| 190 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 191 // After a compaction the mark bitmap is invalid, so we must | |
| 192 // treat all objects as being inside the unmarked area. | |
| 193 zero_marked_bytes(); | |
| 194 init_top_at_mark_start(); | |
| 195 } | |
| 196 | |
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197 void HeapRegion::hr_clear(bool par, bool clear_space, bool locked) { |
| 2152 | 198 assert(_humongous_start_region == NULL, |
| 199 "we should have already filtered out humongous regions"); | |
| 200 assert(_end == _orig_end, | |
| 201 "we should have already filtered out humongous regions"); | |
| 202 | |
| 342 | 203 _in_collection_set = false; |
| 204 | |
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205 set_allocation_context(AllocationContext::system()); |
| 342 | 206 set_young_index_in_cset(-1); |
| 207 uninstall_surv_rate_group(); | |
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208 set_free(); |
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209 reset_pre_dummy_top(); |
| 342 | 210 |
| 211 if (!par) { | |
| 212 // If this is parallel, this will be done later. | |
| 213 HeapRegionRemSet* hrrs = rem_set(); | |
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214 if (locked) { |
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215 hrrs->clear_locked(); |
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216 } else { |
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217 hrrs->clear(); |
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218 } |
| 355 | 219 _claimed = InitialClaimValue; |
| 342 | 220 } |
| 221 zero_marked_bytes(); | |
| 222 | |
| 223 _offsets.resize(HeapRegion::GrainWords); | |
| 224 init_top_at_mark_start(); | |
| 356 | 225 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 226 } |
| 227 | |
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228 void HeapRegion::par_clear() { |
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229 assert(used() == 0, "the region should have been already cleared"); |
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230 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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231 HeapRegionRemSet* hrrs = rem_set(); |
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232 hrrs->clear(); |
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233 CardTableModRefBS* ct_bs = |
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234 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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235 ct_bs->clear(MemRegion(bottom(), end())); |
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236 } |
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237 |
| 342 | 238 void HeapRegion::calc_gc_efficiency() { |
| 6611 | 239 // GC efficiency is the ratio of how much space would be |
| 240 // reclaimed over how long we predict it would take to reclaim it. | |
| 342 | 241 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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242 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 6611 | 243 |
| 244 // Retrieve a prediction of the elapsed time for this region for | |
| 245 // a mixed gc because the region will only be evacuated during a | |
| 246 // mixed gc. | |
| 247 double region_elapsed_time_ms = | |
| 248 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
| 249 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
| 342 | 250 } |
| 251 | |
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252 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 253 assert(!isHumongous(), "sanity / pre-condition"); |
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254 assert(end() == _orig_end, |
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255 "Should be normal before the humongous object allocation"); |
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256 assert(top() == bottom(), "should be empty"); |
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257 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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258 |
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259 _type.set_starts_humongous(); |
| 342 | 260 _humongous_start_region = this; |
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261 |
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262 set_end(new_end); |
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263 _offsets.set_for_starts_humongous(new_top); |
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264 } |
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265 |
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266 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 267 assert(!isHumongous(), "sanity / pre-condition"); |
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268 assert(end() == _orig_end, |
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269 "Should be normal before the humongous object allocation"); |
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270 assert(top() == bottom(), "should be empty"); |
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271 assert(first_hr->startsHumongous(), "pre-condition"); |
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272 |
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273 _type.set_continues_humongous(); |
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274 _humongous_start_region = first_hr; |
| 342 | 275 } |
| 276 | |
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277 void HeapRegion::clear_humongous() { |
| 2152 | 278 assert(isHumongous(), "pre-condition"); |
| 279 | |
| 280 if (startsHumongous()) { | |
| 281 assert(top() <= end(), "pre-condition"); | |
| 282 set_end(_orig_end); | |
| 283 if (top() > end()) { | |
| 284 // at least one "continues humongous" region after it | |
| 285 set_top(end()); | |
| 286 } | |
| 287 } else { | |
| 288 // continues humongous | |
| 289 assert(end() == _orig_end, "sanity"); | |
| 290 } | |
| 291 | |
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292 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
| 2152 | 293 _humongous_start_region = NULL; |
| 294 } | |
| 295 | |
| 342 | 296 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 297 jint current = _claimed; | |
| 298 if (current != claimValue) { | |
| 299 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 300 if (res == current) { | |
| 301 return true; | |
| 302 } | |
| 303 } | |
| 304 return false; | |
| 305 } | |
| 306 | |
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307 HeapRegion::HeapRegion(uint hrm_index, |
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308 G1BlockOffsetSharedArray* sharedOffsetArray, |
| 20417 | 309 MemRegion mr) : |
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310 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
| 20417 | 311 _hrm_index(hrm_index), |
| 312 _allocation_context(AllocationContext::system()), | |
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313 _humongous_start_region(NULL), |
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314 _in_collection_set(false), |
| 342 | 315 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 316 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 6011 | 317 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
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318 _next_young_region(NULL), |
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319 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), |
| 2152 | 320 #ifdef ASSERT |
| 321 _containing_set(NULL), | |
| 322 #endif // ASSERT | |
| 323 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 324 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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325 _predicted_bytes_to_copy(0) |
| 342 | 326 { |
| 12080 | 327 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
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328 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); |
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329 |
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330 initialize(mr); |
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331 } |
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332 |
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333 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
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334 assert(_rem_set->is_empty(), "Remembered set must be empty"); |
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335 |
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336 G1OffsetTableContigSpace::initialize(mr, clear_space, mangle_space); |
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337 |
| 342 | 338 _orig_end = mr.end(); |
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339 hr_clear(false /*par*/, false /*clear_space*/); |
| 356 | 340 set_top(bottom()); |
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341 record_top_and_timestamp(); |
| 342 | 342 } |
| 343 | |
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344 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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345 return G1CollectedHeap::heap()->next_compaction_region(this); |
| 342 | 346 } |
| 347 | |
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348 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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349 bool during_conc_mark) { |
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350 // We always recreate the prev marking info and we'll explicitly |
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351 // mark all objects we find to be self-forwarded on the prev |
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352 // bitmap. So all objects need to be below PTAMS. |
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353 _prev_marked_bytes = 0; |
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354 |
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355 if (during_initial_mark) { |
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356 // During initial-mark, we'll also explicitly mark all objects |
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357 // we find to be self-forwarded on the next bitmap. So all |
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358 // objects need to be below NTAMS. |
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359 _next_top_at_mark_start = top(); |
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360 _next_marked_bytes = 0; |
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361 } else if (during_conc_mark) { |
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362 // During concurrent mark, all objects in the CSet (including |
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363 // the ones we find to be self-forwarded) are implicitly live. |
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364 // So all objects need to be above NTAMS. |
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365 _next_top_at_mark_start = bottom(); |
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366 _next_marked_bytes = 0; |
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367 } |
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368 } |
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369 |
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370 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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371 bool during_conc_mark, |
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372 size_t marked_bytes) { |
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373 assert(0 <= marked_bytes && marked_bytes <= used(), |
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374 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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375 marked_bytes, used())); |
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376 _prev_top_at_mark_start = top(); |
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377 _prev_marked_bytes = marked_bytes; |
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378 } |
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379 |
| 342 | 380 HeapWord* |
| 381 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 382 ObjectClosure* cl) { | |
| 383 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 384 // We used to use "block_start_careful" here. But we're actually happy | |
| 385 // to update the BOT while we do this... | |
| 386 HeapWord* cur = block_start(mr.start()); | |
| 387 mr = mr.intersection(used_region()); | |
| 388 if (mr.is_empty()) return NULL; | |
| 389 // Otherwise, find the obj that extends onto mr.start(). | |
| 390 | |
| 391 assert(cur <= mr.start() | |
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392 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 393 cur + oop(cur)->size() > mr.start()), |
| 394 "postcondition of block_start"); | |
| 395 oop obj; | |
| 396 while (cur < mr.end()) { | |
| 397 obj = oop(cur); | |
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398 if (obj->klass_or_null() == NULL) { |
| 342 | 399 // Ran into an unparseable point. |
| 400 return cur; | |
| 401 } else if (!g1h->is_obj_dead(obj)) { | |
| 402 cl->do_object(obj); | |
| 403 } | |
| 404 if (cl->abort()) return cur; | |
| 405 // The check above must occur before the operation below, since an | |
| 406 // abort might invalidate the "size" operation. | |
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407 cur += block_size(cur); |
| 342 | 408 } |
| 409 return NULL; | |
| 410 } | |
| 411 | |
| 412 HeapWord* | |
| 413 HeapRegion:: | |
| 414 oops_on_card_seq_iterate_careful(MemRegion mr, | |
|
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415 FilterOutOfRegionClosure* cl, |
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416 bool filter_young, |
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417 jbyte* card_ptr) { |
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418 // Currently, we should only have to clean the card if filter_young |
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419 // is true and vice versa. |
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420 if (filter_young) { |
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421 assert(card_ptr != NULL, "pre-condition"); |
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422 } else { |
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423 assert(card_ptr == NULL, "pre-condition"); |
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424 } |
| 342 | 425 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 426 | |
| 427 // If we're within a stop-world GC, then we might look at a card in a | |
| 428 // GC alloc region that extends onto a GC LAB, which may not be | |
| 429 // parseable. Stop such at the "saved_mark" of the region. | |
| 4839 | 430 if (g1h->is_gc_active()) { |
| 342 | 431 mr = mr.intersection(used_region_at_save_marks()); |
| 432 } else { | |
| 433 mr = mr.intersection(used_region()); | |
| 434 } | |
| 435 if (mr.is_empty()) return NULL; | |
| 436 // Otherwise, find the obj that extends onto mr.start(). | |
| 437 | |
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438 // The intersection of the incoming mr (for the card) and the |
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439 // allocated part of the region is non-empty. This implies that |
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440 // we have actually allocated into this region. The code in |
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441 // G1CollectedHeap.cpp that allocates a new region sets the |
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442 // is_young tag on the region before allocating. Thus we |
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443 // safely know if this region is young. |
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444 if (is_young() && filter_young) { |
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445 return NULL; |
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446 } |
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447 |
| 1705 | 448 assert(!is_young(), "check value of filter_young"); |
| 449 | |
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450 // We can only clean the card here, after we make the decision that |
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451 // the card is not young. And we only clean the card if we have been |
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452 // asked to (i.e., card_ptr != NULL). |
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453 if (card_ptr != NULL) { |
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454 *card_ptr = CardTableModRefBS::clean_card_val(); |
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455 // We must complete this write before we do any of the reads below. |
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456 OrderAccess::storeload(); |
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457 } |
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458 |
| 4839 | 459 // Cache the boundaries of the memory region in some const locals |
| 460 HeapWord* const start = mr.start(); | |
| 461 HeapWord* const end = mr.end(); | |
| 462 | |
| 342 | 463 // We used to use "block_start_careful" here. But we're actually happy |
| 464 // to update the BOT while we do this... | |
| 4839 | 465 HeapWord* cur = block_start(start); |
| 466 assert(cur <= start, "Postcondition"); | |
| 467 | |
| 468 oop obj; | |
| 342 | 469 |
| 4839 | 470 HeapWord* next = cur; |
| 471 while (next <= start) { | |
| 472 cur = next; | |
| 473 obj = oop(cur); | |
| 474 if (obj->klass_or_null() == NULL) { | |
| 342 | 475 // Ran into an unparseable point. |
| 476 return cur; | |
| 477 } | |
| 478 // Otherwise... | |
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479 next = cur + block_size(cur); |
| 342 | 480 } |
| 4839 | 481 |
| 482 // If we finish the above loop...We have a parseable object that | |
| 483 // begins on or before the start of the memory region, and ends | |
| 484 // inside or spans the entire region. | |
| 485 | |
| 486 assert(obj == oop(cur), "sanity"); | |
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487 assert(cur <= start, "Loop postcondition"); |
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488 assert(obj->klass_or_null() != NULL, "Loop postcondition"); |
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489 assert((cur + block_size(cur)) > start, "Loop postcondition"); |
| 4839 | 490 |
| 342 | 491 if (!g1h->is_obj_dead(obj)) { |
| 492 obj->oop_iterate(cl, mr); | |
| 493 } | |
| 494 | |
| 4839 | 495 while (cur < end) { |
| 342 | 496 obj = oop(cur); |
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497 if (obj->klass_or_null() == NULL) { |
| 342 | 498 // Ran into an unparseable point. |
| 499 return cur; | |
| 500 }; | |
| 4839 | 501 |
| 342 | 502 // Otherwise: |
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503 next = cur + block_size(cur); |
| 4839 | 504 |
| 342 | 505 if (!g1h->is_obj_dead(obj)) { |
| 4839 | 506 if (next < end || !obj->is_objArray()) { |
| 507 // This object either does not span the MemRegion | |
| 508 // boundary, or if it does it's not an array. | |
| 509 // Apply closure to whole object. | |
| 342 | 510 obj->oop_iterate(cl); |
| 511 } else { | |
| 4839 | 512 // This obj is an array that spans the boundary. |
| 513 // Stop at the boundary. | |
| 514 obj->oop_iterate(cl, mr); | |
| 342 | 515 } |
| 516 } | |
| 517 cur = next; | |
| 518 } | |
| 519 return NULL; | |
| 520 } | |
| 521 | |
| 12080 | 522 // Code roots support |
| 523 | |
| 524 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
| 525 HeapRegionRemSet* hrrs = rem_set(); | |
| 526 hrrs->add_strong_code_root(nm); | |
| 527 } | |
| 528 | |
| 20494 | 529 void HeapRegion::add_strong_code_root_locked(nmethod* nm) { |
| 530 assert_locked_or_safepoint(CodeCache_lock); | |
| 531 HeapRegionRemSet* hrrs = rem_set(); | |
| 532 hrrs->add_strong_code_root_locked(nm); | |
| 533 } | |
| 534 | |
| 12080 | 535 void HeapRegion::remove_strong_code_root(nmethod* nm) { |
| 536 HeapRegionRemSet* hrrs = rem_set(); | |
| 537 hrrs->remove_strong_code_root(nm); | |
| 538 } | |
| 539 | |
| 540 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
| 541 HeapRegionRemSet* hrrs = rem_set(); | |
| 542 hrrs->strong_code_roots_do(blk); | |
| 543 } | |
| 544 | |
| 545 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
| 546 const HeapRegion* _hr; | |
| 547 nmethod* _nm; | |
| 548 bool _failures; | |
| 549 bool _has_oops_in_region; | |
| 550 | |
| 551 template <class T> void do_oop_work(T* p) { | |
| 552 T heap_oop = oopDesc::load_heap_oop(p); | |
| 553 if (!oopDesc::is_null(heap_oop)) { | |
| 554 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 555 | |
| 556 // Note: not all the oops embedded in the nmethod are in the | |
| 557 // current region. We only look at those which are. | |
| 558 if (_hr->is_in(obj)) { | |
| 559 // Object is in the region. Check that its less than top | |
| 560 if (_hr->top() <= (HeapWord*)obj) { | |
| 561 // Object is above top | |
| 562 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
| 563 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
| 564 "top "PTR_FORMAT, | |
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565 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
| 12080 | 566 _failures = true; |
| 567 return; | |
| 568 } | |
| 569 // Nmethod has at least one oop in the current region | |
| 570 _has_oops_in_region = true; | |
| 571 } | |
| 572 } | |
| 573 } | |
| 574 | |
| 575 public: | |
| 576 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
| 577 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
| 578 | |
| 579 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 580 void do_oop(oop* p) { do_oop_work(p); } | |
| 581 | |
| 582 bool failures() { return _failures; } | |
| 583 bool has_oops_in_region() { return _has_oops_in_region; } | |
| 584 }; | |
| 585 | |
| 586 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
| 587 const HeapRegion* _hr; | |
| 588 bool _failures; | |
| 589 public: | |
| 590 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
| 591 _hr(hr), _failures(false) {} | |
| 592 | |
| 593 void do_code_blob(CodeBlob* cb) { | |
| 594 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
| 595 if (nm != NULL) { | |
| 596 // Verify that the nemthod is live | |
| 597 if (!nm->is_alive()) { | |
| 598 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
| 599 PTR_FORMAT" in its strong code roots", | |
| 600 _hr->bottom(), _hr->end(), nm); | |
| 601 _failures = true; | |
| 602 } else { | |
| 603 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
| 604 nm->oops_do(&oop_cl); | |
| 605 if (!oop_cl.has_oops_in_region()) { | |
| 606 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
| 607 PTR_FORMAT" in its strong code roots " | |
| 608 "with no pointers into region", | |
| 609 _hr->bottom(), _hr->end(), nm); | |
| 610 _failures = true; | |
| 611 } else if (oop_cl.failures()) { | |
| 612 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
| 613 "failures for nmethod "PTR_FORMAT, | |
| 614 _hr->bottom(), _hr->end(), nm); | |
| 615 _failures = true; | |
| 616 } | |
| 617 } | |
| 618 } | |
| 619 } | |
| 620 | |
| 621 bool failures() { return _failures; } | |
| 622 }; | |
| 623 | |
| 624 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
| 625 if (!G1VerifyHeapRegionCodeRoots) { | |
| 626 // We're not verifying code roots. | |
| 627 return; | |
| 628 } | |
| 629 if (vo == VerifyOption_G1UseMarkWord) { | |
| 630 // Marking verification during a full GC is performed after class | |
| 631 // unloading, code cache unloading, etc so the strong code roots | |
| 632 // attached to each heap region are in an inconsistent state. They won't | |
| 633 // be consistent until the strong code roots are rebuilt after the | |
| 634 // actual GC. Skip verifying the strong code roots in this particular | |
| 635 // time. | |
| 636 assert(VerifyDuringGC, "only way to get here"); | |
| 637 return; | |
| 638 } | |
| 639 | |
| 640 HeapRegionRemSet* hrrs = rem_set(); | |
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641 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
| 12080 | 642 |
| 643 // if this region is empty then there should be no entries | |
| 644 // on its strong code root list | |
| 645 if (is_empty()) { | |
| 646 if (strong_code_roots_length > 0) { | |
| 647 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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648 "but has "SIZE_FORMAT" code root entries", |
| 12080 | 649 bottom(), end(), strong_code_roots_length); |
| 650 *failures = true; | |
| 651 } | |
| 652 return; | |
| 653 } | |
| 654 | |
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655 if (continuesHumongous()) { |
| 12080 | 656 if (strong_code_roots_length > 0) { |
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657 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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658 "region but has "SIZE_FORMAT" code root entries", |
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659 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
| 12080 | 660 *failures = true; |
| 661 } | |
| 662 return; | |
| 663 } | |
| 664 | |
| 665 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
| 666 strong_code_roots_do(&cb_cl); | |
| 667 | |
| 668 if (cb_cl.failures()) { | |
| 669 *failures = true; | |
| 670 } | |
| 671 } | |
| 672 | |
| 342 | 673 void HeapRegion::print() const { print_on(gclog_or_tty); } |
| 674 void HeapRegion::print_on(outputStream* st) const { | |
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675 st->print("AC%4u", allocation_context()); |
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676 st->print(" %2s", get_short_type_str()); |
| 342 | 677 if (in_collection_set()) |
| 678 st->print(" CS"); | |
| 679 else | |
| 680 st->print(" "); | |
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681 st->print(" TS %5d", _gc_time_stamp); |
| 1388 | 682 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 683 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 684 G1OffsetTableContigSpace::print_on(st); |
| 685 } | |
| 686 | |
| 12080 | 687 class VerifyLiveClosure: public OopClosure { |
| 688 private: | |
| 689 G1CollectedHeap* _g1h; | |
| 690 CardTableModRefBS* _bs; | |
| 691 oop _containing_obj; | |
| 692 bool _failures; | |
| 693 int _n_failures; | |
| 694 VerifyOption _vo; | |
| 695 public: | |
| 696 // _vo == UsePrevMarking -> use "prev" marking information, | |
| 697 // _vo == UseNextMarking -> use "next" marking information, | |
| 698 // _vo == UseMarkWord -> use mark word from object header. | |
| 699 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
| 700 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
| 701 _failures(false), _n_failures(0), _vo(vo) | |
| 702 { | |
| 703 BarrierSet* bs = _g1h->barrier_set(); | |
| 704 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 705 _bs = (CardTableModRefBS*)bs; | |
| 706 } | |
| 707 | |
| 708 void set_containing_obj(oop obj) { | |
| 709 _containing_obj = obj; | |
| 710 } | |
| 711 | |
| 712 bool failures() { return _failures; } | |
| 713 int n_failures() { return _n_failures; } | |
| 714 | |
| 715 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 716 virtual void do_oop( oop* p) { do_oop_work(p); } | |
| 717 | |
| 718 void print_object(outputStream* out, oop obj) { | |
| 719 #ifdef PRODUCT | |
| 720 Klass* k = obj->klass(); | |
| 721 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
| 722 out->print_cr("class name %s", class_name); | |
| 723 #else // PRODUCT | |
| 724 obj->print_on(out); | |
| 725 #endif // PRODUCT | |
| 726 } | |
| 727 | |
| 728 template <class T> | |
| 729 void do_oop_work(T* p) { | |
| 730 assert(_containing_obj != NULL, "Precondition"); | |
| 731 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
| 732 "Precondition"); | |
| 733 T heap_oop = oopDesc::load_heap_oop(p); | |
| 734 if (!oopDesc::is_null(heap_oop)) { | |
| 735 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 736 bool failed = false; | |
| 737 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
| 738 MutexLockerEx x(ParGCRareEvent_lock, | |
| 739 Mutex::_no_safepoint_check_flag); | |
| 740 | |
| 741 if (!_failures) { | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17773
diff
changeset
|
742 gclog_or_tty->cr(); |
| 12080 | 743 gclog_or_tty->print_cr("----------"); |
| 744 } | |
| 745 if (!_g1h->is_in_closed_subset(obj)) { | |
| 746 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 747 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 748 " of live obj "PTR_FORMAT" in region " | |
| 749 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 750 p, (void*) _containing_obj, | |
| 751 from->bottom(), from->end()); | |
| 752 print_object(gclog_or_tty, _containing_obj); | |
| 753 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 754 (void*) obj); | |
| 755 } else { | |
| 756 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 757 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 758 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 759 " of live obj "PTR_FORMAT" in region " | |
| 760 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 761 p, (void*) _containing_obj, | |
| 762 from->bottom(), from->end()); | |
| 763 print_object(gclog_or_tty, _containing_obj); | |
| 764 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 765 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 766 (void*) obj, to->bottom(), to->end()); | |
| 767 print_object(gclog_or_tty, obj); | |
| 768 } | |
| 769 gclog_or_tty->print_cr("----------"); | |
| 770 gclog_or_tty->flush(); | |
| 771 _failures = true; | |
| 772 failed = true; | |
| 773 _n_failures++; | |
| 774 } | |
| 775 | |
| 776 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
| 777 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 778 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 779 if (from != NULL && to != NULL && | |
| 780 from != to && | |
| 781 !to->isHumongous()) { | |
| 782 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 783 jbyte cv_field = *_bs->byte_for_const(p); | |
| 784 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 785 | |
| 786 bool is_bad = !(from->is_young() | |
| 787 || to->rem_set()->contains_reference(p) | |
| 788 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 789 (_containing_obj->is_objArray() ? | |
| 790 cv_field == dirty | |
| 791 : cv_obj == dirty || cv_field == dirty)); | |
| 792 if (is_bad) { | |
| 793 MutexLockerEx x(ParGCRareEvent_lock, | |
| 794 Mutex::_no_safepoint_check_flag); | |
| 795 | |
| 796 if (!_failures) { | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17773
diff
changeset
|
797 gclog_or_tty->cr(); |
| 12080 | 798 gclog_or_tty->print_cr("----------"); |
| 799 } | |
| 800 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 801 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
| 802 "of obj "PTR_FORMAT", " | |
| 803 "in region "HR_FORMAT, | |
| 804 p, (void*) _containing_obj, | |
| 805 HR_FORMAT_PARAMS(from)); | |
| 806 _containing_obj->print_on(gclog_or_tty); | |
| 807 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
| 808 "in region "HR_FORMAT, | |
| 809 (void*) obj, | |
| 810 HR_FORMAT_PARAMS(to)); | |
| 811 obj->print_on(gclog_or_tty); | |
| 812 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 813 cv_obj, cv_field); | |
| 814 gclog_or_tty->print_cr("----------"); | |
| 815 gclog_or_tty->flush(); | |
| 816 _failures = true; | |
| 817 if (!failed) _n_failures++; | |
| 818 } | |
| 819 } | |
| 820 } | |
| 821 } | |
| 822 } | |
| 823 }; | |
| 811 | 824 |
| 342 | 825 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 826 // We would need a mechanism to make that code skip dead objects. | |
| 827 | |
| 6008 | 828 void HeapRegion::verify(VerifyOption vo, |
|
1020
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tonyp
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942
diff
changeset
|
829 bool* failures) const { |
| 342 | 830 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
831 *failures = false; |
| 342 | 832 HeapWord* p = bottom(); |
| 833 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
834 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
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1705
diff
changeset
|
835 bool is_humongous = isHumongous(); |
|
2133
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tonyp
parents:
1972
diff
changeset
|
836 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
837 size_t object_num = 0; |
| 342 | 838 while (p < top()) { |
|
2133
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tonyp
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1972
diff
changeset
|
839 oop obj = oop(p); |
|
20276
1526a938e670
8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents:
20274
diff
changeset
|
840 size_t obj_size = block_size(p); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
841 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
842 |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
843 if (is_humongous != g1->isHumongous(obj_size) && |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
844 !g1->is_obj_dead(obj, this)) { // Dead objects may have bigger block_size since they span several objects. |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
845 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
846 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
847 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
848 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
849 *failures = true; |
|
2133
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7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
850 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
851 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
852 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
853 // If it returns false, verify_for_object() will output the |
|
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents:
20295
diff
changeset
|
854 // appropriate message. |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
855 if (do_bot_verify && |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
856 !g1->is_obj_dead(obj, this) && |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
857 !_offsets.verify_for_object(p, obj_size)) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
858 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
859 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
860 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
861 |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
862 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
|
2133
2250ee17e258
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parents:
1972
diff
changeset
|
863 if (obj->is_oop()) { |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
864 Klass* klass = obj->klass(); |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
865 bool is_metaspace_object = Metaspace::contains(klass) || |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
866 (vo == VerifyOption_G1UsePrevMarking && |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
867 ClassLoaderDataGraph::unload_list_contains(klass)); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
868 if (!is_metaspace_object) { |
|
2133
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
869 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
870 "not metadata", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
871 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
872 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
873 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
874 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
875 "not a klass", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
876 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
877 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
878 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
879 vl_cl.set_containing_obj(obj); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
880 obj->oop_iterate_no_header(&vl_cl); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
881 if (vl_cl.failures()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
882 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
883 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
884 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
885 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
886 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
887 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
888 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
889 } else { |
|
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
890 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
891 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
892 return; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
893 } |
| 342 | 894 } |
| 895 prev_p = p; | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
896 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
897 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
898 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
899 if (p != top()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
900 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
901 "does not match top "PTR_FORMAT, p, top()); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
902 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
903 return; |
| 342 | 904 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
905 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
906 HeapWord* the_end = end(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
907 assert(p == top(), "it should still hold"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
908 // Do some extra BOT consistency checking for addresses in the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
909 // range [top, end). BOT look-ups in this range should yield |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
910 // top. No point in doing that if top == end (there's nothing there). |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
911 if (p < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
912 // Look up top |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
913 HeapWord* addr_1 = p; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
914 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
915 if (b_start_1 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
916 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
917 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
918 addr_1, b_start_1, p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
919 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
920 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
921 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
922 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
923 // Look up top + 1 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
924 HeapWord* addr_2 = p + 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
925 if (addr_2 < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
926 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
927 if (b_start_2 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
928 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
929 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
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diff
changeset
|
930 addr_2, b_start_2, p); |
|
1020
ff2402f6a50b
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942
diff
changeset
|
931 *failures = true; |
|
ff2402f6a50b
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parents:
942
diff
changeset
|
932 return; |
|
2133
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1972
diff
changeset
|
933 } |
|
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1972
diff
changeset
|
934 } |
|
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diff
changeset
|
935 |
|
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diff
changeset
|
936 // Look up an address between top and end |
|
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diff
changeset
|
937 size_t diff = pointer_delta(the_end, p) / 2; |
|
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1972
diff
changeset
|
938 HeapWord* addr_3 = p + diff; |
|
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diff
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|
939 if (addr_3 < the_end) { |
|
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diff
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|
940 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
|
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|
941 if (b_start_3 != p) { |
|
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diff
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|
942 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
|
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diff
changeset
|
943 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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diff
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|
944 addr_3, b_start_3, p); |
|
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1972
diff
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|
945 *failures = true; |
|
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7007068: G1: refine the BOT during evac failure handling
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parents:
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diff
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|
946 return; |
|
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7007068: G1: refine the BOT during evac failure handling
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parents:
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diff
changeset
|
947 } |
|
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diff
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|
948 } |
|
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diff
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|
949 |
|
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|
950 // Loook up end - 1 |
|
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1972
diff
changeset
|
951 HeapWord* addr_4 = the_end - 1; |
|
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diff
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|
952 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
|
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|
953 if (b_start_4 != p) { |
|
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diff
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|
954 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
|
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diff
changeset
|
955 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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diff
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|
956 addr_4, b_start_4, p); |
|
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diff
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|
957 *failures = true; |
|
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diff
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|
958 return; |
|
1020
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942
diff
changeset
|
959 } |
| 342 | 960 } |
|
1020
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942
diff
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|
961 |
|
1718
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tonyp
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1705
diff
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|
962 if (is_humongous && object_num > 1) { |
|
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|
963 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
|
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|
964 "but has "SIZE_FORMAT", objects", |
|
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|
965 bottom(), end(), object_num); |
|
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|
966 *failures = true; |
|
1020
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|
967 return; |
| 342 | 968 } |
| 12080 | 969 |
| 970 verify_strong_code_roots(vo, failures); | |
| 971 } | |
| 972 | |
| 973 void HeapRegion::verify() const { | |
| 974 bool dummy = false; | |
| 975 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
| 342 | 976 } |
| 977 | |
| 978 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 979 // away eventually. | |
| 980 | |
| 356 | 981 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
|
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982 set_top(bottom()); |
|
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983 set_saved_mark_word(bottom()); |
|
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984 CompactibleSpace::clear(mangle_space); |
|
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985 reset_bot(); |
| 342 | 986 } |
| 987 | |
| 988 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 989 Space::set_bottom(new_bottom); | |
| 990 _offsets.set_bottom(new_bottom); | |
| 991 } | |
| 992 | |
| 993 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 994 Space::set_end(new_end); | |
| 995 _offsets.resize(new_end - bottom()); | |
| 996 } | |
| 997 | |
| 998 void G1OffsetTableContigSpace::print() const { | |
| 999 print_short(); | |
| 1000 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 1001 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 1002 bottom(), top(), _offsets.threshold(), end()); | |
| 1003 } | |
| 1004 | |
| 1005 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 1006 return _offsets.initialize_threshold(); | |
| 1007 } | |
| 1008 | |
| 1009 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 1010 HeapWord* end) { | |
| 1011 _offsets.alloc_block(start, end); | |
| 1012 return _offsets.threshold(); | |
| 1013 } | |
| 1014 | |
| 1015 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 1016 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1017 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
|
20652
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1018 HeapWord* local_top = top(); |
|
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|
1019 OrderAccess::loadload(); |
|
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|
1020 if (_gc_time_stamp < g1h->get_gc_time_stamp()) { |
|
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1021 return local_top; |
|
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1022 } else { |
|
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1023 return Space::saved_mark_word(); |
|
20652
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1024 } |
| 342 | 1025 } |
| 1026 | |
|
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1027 void G1OffsetTableContigSpace::record_top_and_timestamp() { |
| 342 | 1028 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1029 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 1030 | |
| 1031 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 1032 // The order of these is important, as another thread might be | |
| 1033 // about to start scanning this region. If it does so after | |
| 1034 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 1035 // will be false, and it will pick up top() as the high water mark | |
| 1036 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 1037 // will pick up the right saved_mark_word() as the high water mark | |
| 1038 // of the region. Either way, the behaviour will be correct. | |
|
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1039 Space::set_saved_mark_word(top()); |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
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|
1040 OrderAccess::storestore(); |
|
353
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6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
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diff
changeset
|
1041 _gc_time_stamp = curr_gc_time_stamp; |
|
2433
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|
1042 // No need to do another barrier to flush the writes above. If |
|
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1043 // this is called in parallel with other threads trying to |
|
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1044 // allocate into the region, the caller should call this while |
|
abdfc822206f
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|
1045 // holding a lock and when the lock is released the writes will be |
|
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|
1046 // flushed. |
| 342 | 1047 } |
| 1048 } | |
| 1049 | |
|
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1050 void G1OffsetTableContigSpace::safe_object_iterate(ObjectClosure* blk) { |
|
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1051 object_iterate(blk); |
|
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|
1052 } |
|
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|
1053 |
|
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1054 void G1OffsetTableContigSpace::object_iterate(ObjectClosure* blk) { |
|
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1055 HeapWord* p = bottom(); |
|
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1056 while (p < top()) { |
|
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1057 if (block_is_obj(p)) { |
|
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1058 blk->do_object(oop(p)); |
|
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1059 } |
|
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1060 p += block_size(p); |
|
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1061 } |
|
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1062 } |
|
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|
1063 |
|
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|
1064 #define block_is_always_obj(q) true |
|
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1065 void G1OffsetTableContigSpace::prepare_for_compaction(CompactPoint* cp) { |
|
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|
1066 SCAN_AND_FORWARD(cp, top, block_is_always_obj, block_size); |
|
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1067 } |
|
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|
1068 #undef block_is_always_obj |
|
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|
1069 |
| 342 | 1070 G1OffsetTableContigSpace:: |
| 1071 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
|
6754
8fbf05030e24
7016955: G1: remove the is_zeroed parameter from the HeapRegion constructor
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|
1072 MemRegion mr) : |
| 342 | 1073 _offsets(sharedOffsetArray, mr), |
| 1074 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 1075 _gc_time_stamp(0) | |
| 1076 { | |
| 1077 _offsets.set_space(this); | |
|
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8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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|
1078 } |
|
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|
1079 |
|
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|
1080 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
|
6701abbc4441
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changeset
|
1081 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
|
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1082 _top = bottom(); |
|
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|
1083 reset_bot(); |
| 342 | 1084 } |
|
20336
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|
1085 |