Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 13019:a57a165b8296
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Reviewed-by: kvn, roland
author | rbackman |
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date | Mon, 28 Oct 2013 08:34:10 +0100 |
parents | 190899198332 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
33 #include "memory/genOopClosures.inline.hpp" | |
34 #include "memory/iterator.hpp" | |
35 #include "oops/oop.inline.hpp" | |
342 | 36 |
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37 int HeapRegion::LogOfHRGrainBytes = 0; |
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38 int HeapRegion::LogOfHRGrainWords = 0; |
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39 size_t HeapRegion::GrainBytes = 0; |
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40 size_t HeapRegion::GrainWords = 0; |
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41 size_t HeapRegion::CardsPerRegion = 0; |
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42 |
342 | 43 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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44 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 45 CardTableModRefBS::PrecisionStyle precision, |
46 FilterKind fk) : | |
47 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
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48 _hr(hr), _fk(fk), _g1(g1) { } |
342 | 49 |
50 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
51 OopClosure* oc) : | |
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52 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
342 | 53 |
54 template<class ClosureType> | |
55 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
56 HeapRegion* hr, | |
57 HeapWord* cur, HeapWord* top) { | |
58 oop cur_oop = oop(cur); | |
59 int oop_size = cur_oop->size(); | |
60 HeapWord* next_obj = cur + oop_size; | |
61 while (next_obj < top) { | |
62 // Keep filtering the remembered set. | |
63 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
64 // Bottom lies entirely below top, so we can call the | |
65 // non-memRegion version of oop_iterate below. | |
66 cur_oop->oop_iterate(cl); | |
67 } | |
68 cur = next_obj; | |
69 cur_oop = oop(cur); | |
70 oop_size = cur_oop->size(); | |
71 next_obj = cur + oop_size; | |
72 } | |
73 return cur; | |
74 } | |
75 | |
76 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
77 HeapWord* bottom, | |
78 HeapWord* top, | |
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79 ExtendedOopClosure* cl) { |
342 | 80 G1CollectedHeap* g1h = _g1; |
81 int oop_size; | |
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82 ExtendedOopClosure* cl2 = NULL; |
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83 |
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84 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
342 | 85 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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86 |
342 | 87 switch (_fk) { |
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88 case NoFilterKind: cl2 = cl; break; |
342 | 89 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
90 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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91 default: ShouldNotReachHere(); |
342 | 92 } |
93 | |
94 // Start filtering what we add to the remembered set. If the object is | |
95 // not considered dead, either because it is marked (in the mark bitmap) | |
96 // or it was allocated after marking finished, then we add it. Otherwise | |
97 // we can safely ignore the object. | |
98 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
99 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
100 } else { | |
101 oop_size = oop(bottom)->size(); | |
102 } | |
103 | |
104 bottom += oop_size; | |
105 | |
106 if (bottom < top) { | |
107 // We replicate the loop below for several kinds of possible filters. | |
108 switch (_fk) { | |
109 case NoFilterKind: | |
110 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
111 break; | |
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112 |
342 | 113 case IntoCSFilterKind: { |
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114 FilterIntoCSClosure filt(this, g1h, cl); |
342 | 115 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
116 break; | |
117 } | |
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118 |
342 | 119 case OutOfRegionFilterKind: { |
120 FilterOutOfRegionClosure filt(_hr, cl); | |
121 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
122 break; | |
123 } | |
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124 |
342 | 125 default: |
126 ShouldNotReachHere(); | |
127 } | |
128 | |
129 // Last object. Need to do dead-obj filtering here too. | |
130 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
131 oop(bottom)->oop_iterate(cl2, mr); | |
132 } | |
133 } | |
134 } | |
135 | |
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136 // Minimum region size; we won't go lower than that. |
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137 // We might want to decrease this in the future, to deal with small |
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138 // heaps a bit more efficiently. |
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139 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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140 |
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141 // Maximum region size; we don't go higher than that. There's a good |
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142 // reason for having an upper bound. We don't want regions to get too |
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143 // large, otherwise cleanup's effectiveness would decrease as there |
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144 // will be fewer opportunities to find totally empty regions after |
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145 // marking. |
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146 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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147 |
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148 // The automatic region size calculation will try to have around this |
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149 // many regions in the heap (based on the min heap size). |
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150 #define TARGET_REGION_NUMBER 2048 |
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151 |
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152 size_t HeapRegion::max_region_size() { |
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153 return (size_t)MAX_REGION_SIZE; |
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154 } |
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155 |
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156 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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157 uintx region_size = G1HeapRegionSize; |
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158 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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159 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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160 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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161 (uintx) MIN_REGION_SIZE); |
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162 } |
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163 |
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164 int region_size_log = log2_long((jlong) region_size); |
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165 // Recalculate the region size to make sure it's a power of |
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166 // 2. This means that region_size is the largest power of 2 that's |
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167 // <= what we've calculated so far. |
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168 region_size = ((uintx)1 << region_size_log); |
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169 |
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170 // Now make sure that we don't go over or under our limits. |
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171 if (region_size < MIN_REGION_SIZE) { |
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172 region_size = MIN_REGION_SIZE; |
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173 } else if (region_size > MAX_REGION_SIZE) { |
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174 region_size = MAX_REGION_SIZE; |
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175 } |
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176 |
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177 if (region_size != G1HeapRegionSize) { |
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178 // Update the flag to make sure that PrintFlagsFinal logs the correct value |
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179 FLAG_SET_ERGO(uintx, G1HeapRegionSize, region_size); |
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180 } |
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181 |
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182 // And recalculate the log. |
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183 region_size_log = log2_long((jlong) region_size); |
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184 |
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185 // Now, set up the globals. |
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186 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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187 LogOfHRGrainBytes = region_size_log; |
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188 |
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189 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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190 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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191 |
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192 guarantee(GrainBytes == 0, "we should only set it once"); |
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193 // The cast to int is safe, given that we've bounded region_size by |
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194 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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195 GrainBytes = (size_t)region_size; |
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196 |
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197 guarantee(GrainWords == 0, "we should only set it once"); |
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198 GrainWords = GrainBytes >> LogHeapWordSize; |
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199 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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200 |
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201 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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202 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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203 } |
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204 |
342 | 205 void HeapRegion::reset_after_compaction() { |
206 G1OffsetTableContigSpace::reset_after_compaction(); | |
207 // After a compaction the mark bitmap is invalid, so we must | |
208 // treat all objects as being inside the unmarked area. | |
209 zero_marked_bytes(); | |
210 init_top_at_mark_start(); | |
211 } | |
212 | |
213 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 214 assert(_humongous_type == NotHumongous, |
215 "we should have already filtered out humongous regions"); | |
216 assert(_humongous_start_region == NULL, | |
217 "we should have already filtered out humongous regions"); | |
218 assert(_end == _orig_end, | |
219 "we should have already filtered out humongous regions"); | |
220 | |
342 | 221 _in_collection_set = false; |
222 | |
223 set_young_index_in_cset(-1); | |
224 uninstall_surv_rate_group(); | |
225 set_young_type(NotYoung); | |
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226 reset_pre_dummy_top(); |
342 | 227 |
228 if (!par) { | |
229 // If this is parallel, this will be done later. | |
230 HeapRegionRemSet* hrrs = rem_set(); | |
12080 | 231 hrrs->clear(); |
355 | 232 _claimed = InitialClaimValue; |
342 | 233 } |
234 zero_marked_bytes(); | |
235 | |
236 _offsets.resize(HeapRegion::GrainWords); | |
237 init_top_at_mark_start(); | |
356 | 238 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 239 } |
240 | |
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241 void HeapRegion::par_clear() { |
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242 assert(used() == 0, "the region should have been already cleared"); |
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243 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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244 HeapRegionRemSet* hrrs = rem_set(); |
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245 hrrs->clear(); |
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246 CardTableModRefBS* ct_bs = |
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247 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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248 ct_bs->clear(MemRegion(bottom(), end())); |
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249 } |
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250 |
342 | 251 void HeapRegion::calc_gc_efficiency() { |
6611 | 252 // GC efficiency is the ratio of how much space would be |
253 // reclaimed over how long we predict it would take to reclaim it. | |
342 | 254 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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255 G1CollectorPolicy* g1p = g1h->g1_policy(); |
6611 | 256 |
257 // Retrieve a prediction of the elapsed time for this region for | |
258 // a mixed gc because the region will only be evacuated during a | |
259 // mixed gc. | |
260 double region_elapsed_time_ms = | |
261 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
262 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
342 | 263 } |
264 | |
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265 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 266 assert(!isHumongous(), "sanity / pre-condition"); |
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267 assert(end() == _orig_end, |
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268 "Should be normal before the humongous object allocation"); |
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269 assert(top() == bottom(), "should be empty"); |
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270 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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271 |
355 | 272 _humongous_type = StartsHumongous; |
342 | 273 _humongous_start_region = this; |
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274 |
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275 set_end(new_end); |
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276 _offsets.set_for_starts_humongous(new_top); |
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277 } |
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278 |
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279 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 280 assert(!isHumongous(), "sanity / pre-condition"); |
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281 assert(end() == _orig_end, |
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282 "Should be normal before the humongous object allocation"); |
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283 assert(top() == bottom(), "should be empty"); |
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284 assert(first_hr->startsHumongous(), "pre-condition"); |
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285 |
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286 _humongous_type = ContinuesHumongous; |
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287 _humongous_start_region = first_hr; |
342 | 288 } |
289 | |
2152 | 290 void HeapRegion::set_notHumongous() { |
291 assert(isHumongous(), "pre-condition"); | |
292 | |
293 if (startsHumongous()) { | |
294 assert(top() <= end(), "pre-condition"); | |
295 set_end(_orig_end); | |
296 if (top() > end()) { | |
297 // at least one "continues humongous" region after it | |
298 set_top(end()); | |
299 } | |
300 } else { | |
301 // continues humongous | |
302 assert(end() == _orig_end, "sanity"); | |
303 } | |
304 | |
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305 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 306 _humongous_type = NotHumongous; |
307 _humongous_start_region = NULL; | |
308 } | |
309 | |
342 | 310 bool HeapRegion::claimHeapRegion(jint claimValue) { |
311 jint current = _claimed; | |
312 if (current != claimValue) { | |
313 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
314 if (res == current) { | |
315 return true; | |
316 } | |
317 } | |
318 return false; | |
319 } | |
320 | |
321 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
322 HeapWord* low = addr; | |
323 HeapWord* high = end(); | |
324 while (low < high) { | |
325 size_t diff = pointer_delta(high, low); | |
326 // Must add one below to bias toward the high amount. Otherwise, if | |
327 // "high" were at the desired value, and "low" were one less, we | |
328 // would not converge on "high". This is not symmetric, because | |
329 // we set "high" to a block start, which might be the right one, | |
330 // which we don't do for "low". | |
331 HeapWord* middle = low + (diff+1)/2; | |
332 if (middle == high) return high; | |
333 HeapWord* mid_bs = block_start_careful(middle); | |
334 if (mid_bs < addr) { | |
335 low = middle; | |
336 } else { | |
337 high = mid_bs; | |
338 } | |
339 } | |
340 assert(low == high && low >= addr, "Didn't work."); | |
341 return low; | |
342 } | |
343 | |
344 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
345 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
346 #endif // _MSC_VER | |
347 | |
348 | |
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349 HeapRegion::HeapRegion(uint hrs_index, |
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350 G1BlockOffsetSharedArray* sharedOffsetArray, |
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351 MemRegion mr) : |
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352 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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353 _hrs_index(hrs_index), |
355 | 354 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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355 _in_collection_set(false), |
342 | 356 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 357 _claimed(InitialClaimValue), _evacuation_failed(false), |
6011 | 358 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
342 | 359 _young_type(NotYoung), _next_young_region(NULL), |
2152 | 360 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
361 #ifdef ASSERT | |
362 _containing_set(NULL), | |
363 #endif // ASSERT | |
364 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
365 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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366 _predicted_bytes_to_copy(0) |
342 | 367 { |
12080 | 368 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
342 | 369 _orig_end = mr.end(); |
370 // Note that initialize() will set the start of the unmarked area of the | |
371 // region. | |
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372 hr_clear(false /*par*/, false /*clear_space*/); |
356 | 373 set_top(bottom()); |
374 set_saved_mark(); | |
342 | 375 |
376 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
377 } | |
378 | |
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379 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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380 // We're not using an iterator given that it will wrap around when |
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381 // it reaches the last region and this is not what we want here. |
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382 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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383 uint index = hrs_index() + 1; |
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384 while (index < g1h->n_regions()) { |
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385 HeapRegion* hr = g1h->region_at(index); |
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386 if (!hr->isHumongous()) { |
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387 return hr; |
342 | 388 } |
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389 index += 1; |
342 | 390 } |
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391 return NULL; |
342 | 392 } |
393 | |
394 void HeapRegion::save_marks() { | |
395 set_saved_mark(); | |
396 } | |
397 | |
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398 void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 399 HeapWord* p = mr.start(); |
400 HeapWord* e = mr.end(); | |
401 oop obj; | |
402 while (p < e) { | |
403 obj = oop(p); | |
404 p += obj->oop_iterate(cl); | |
405 } | |
406 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
407 } | |
408 | |
409 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
410 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
411 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
412 } | |
413 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
414 | |
415 | |
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416 void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) { |
342 | 417 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); |
418 } | |
419 | |
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420 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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421 bool during_conc_mark) { |
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422 // We always recreate the prev marking info and we'll explicitly |
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423 // mark all objects we find to be self-forwarded on the prev |
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424 // bitmap. So all objects need to be below PTAMS. |
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425 _prev_top_at_mark_start = top(); |
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426 _prev_marked_bytes = 0; |
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427 |
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428 if (during_initial_mark) { |
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429 // During initial-mark, we'll also explicitly mark all objects |
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430 // we find to be self-forwarded on the next bitmap. So all |
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431 // objects need to be below NTAMS. |
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432 _next_top_at_mark_start = top(); |
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433 _next_marked_bytes = 0; |
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434 } else if (during_conc_mark) { |
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435 // During concurrent mark, all objects in the CSet (including |
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436 // the ones we find to be self-forwarded) are implicitly live. |
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437 // So all objects need to be above NTAMS. |
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438 _next_top_at_mark_start = bottom(); |
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439 _next_marked_bytes = 0; |
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440 } |
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441 } |
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442 |
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443 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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444 bool during_conc_mark, |
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445 size_t marked_bytes) { |
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446 assert(0 <= marked_bytes && marked_bytes <= used(), |
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447 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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448 marked_bytes, used())); |
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449 _prev_marked_bytes = marked_bytes; |
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450 } |
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451 |
342 | 452 HeapWord* |
453 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
454 ObjectClosure* cl) { | |
455 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
456 // We used to use "block_start_careful" here. But we're actually happy | |
457 // to update the BOT while we do this... | |
458 HeapWord* cur = block_start(mr.start()); | |
459 mr = mr.intersection(used_region()); | |
460 if (mr.is_empty()) return NULL; | |
461 // Otherwise, find the obj that extends onto mr.start(). | |
462 | |
463 assert(cur <= mr.start() | |
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464 && (oop(cur)->klass_or_null() == NULL || |
342 | 465 cur + oop(cur)->size() > mr.start()), |
466 "postcondition of block_start"); | |
467 oop obj; | |
468 while (cur < mr.end()) { | |
469 obj = oop(cur); | |
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470 if (obj->klass_or_null() == NULL) { |
342 | 471 // Ran into an unparseable point. |
472 return cur; | |
473 } else if (!g1h->is_obj_dead(obj)) { | |
474 cl->do_object(obj); | |
475 } | |
476 if (cl->abort()) return cur; | |
477 // The check above must occur before the operation below, since an | |
478 // abort might invalidate the "size" operation. | |
479 cur += obj->size(); | |
480 } | |
481 return NULL; | |
482 } | |
483 | |
484 HeapWord* | |
485 HeapRegion:: | |
486 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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487 FilterOutOfRegionClosure* cl, |
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488 bool filter_young, |
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489 jbyte* card_ptr) { |
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490 // Currently, we should only have to clean the card if filter_young |
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491 // is true and vice versa. |
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492 if (filter_young) { |
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493 assert(card_ptr != NULL, "pre-condition"); |
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494 } else { |
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495 assert(card_ptr == NULL, "pre-condition"); |
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496 } |
342 | 497 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
498 | |
499 // If we're within a stop-world GC, then we might look at a card in a | |
500 // GC alloc region that extends onto a GC LAB, which may not be | |
501 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 502 if (g1h->is_gc_active()) { |
342 | 503 mr = mr.intersection(used_region_at_save_marks()); |
504 } else { | |
505 mr = mr.intersection(used_region()); | |
506 } | |
507 if (mr.is_empty()) return NULL; | |
508 // Otherwise, find the obj that extends onto mr.start(). | |
509 | |
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510 // The intersection of the incoming mr (for the card) and the |
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511 // allocated part of the region is non-empty. This implies that |
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512 // we have actually allocated into this region. The code in |
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513 // G1CollectedHeap.cpp that allocates a new region sets the |
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514 // is_young tag on the region before allocating. Thus we |
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515 // safely know if this region is young. |
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516 if (is_young() && filter_young) { |
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517 return NULL; |
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518 } |
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519 |
1705 | 520 assert(!is_young(), "check value of filter_young"); |
521 | |
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522 // We can only clean the card here, after we make the decision that |
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523 // the card is not young. And we only clean the card if we have been |
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524 // asked to (i.e., card_ptr != NULL). |
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525 if (card_ptr != NULL) { |
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526 *card_ptr = CardTableModRefBS::clean_card_val(); |
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527 // We must complete this write before we do any of the reads below. |
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528 OrderAccess::storeload(); |
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529 } |
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530 |
4839 | 531 // Cache the boundaries of the memory region in some const locals |
532 HeapWord* const start = mr.start(); | |
533 HeapWord* const end = mr.end(); | |
534 | |
342 | 535 // We used to use "block_start_careful" here. But we're actually happy |
536 // to update the BOT while we do this... | |
4839 | 537 HeapWord* cur = block_start(start); |
538 assert(cur <= start, "Postcondition"); | |
539 | |
540 oop obj; | |
342 | 541 |
4839 | 542 HeapWord* next = cur; |
543 while (next <= start) { | |
544 cur = next; | |
545 obj = oop(cur); | |
546 if (obj->klass_or_null() == NULL) { | |
342 | 547 // Ran into an unparseable point. |
548 return cur; | |
549 } | |
550 // Otherwise... | |
4839 | 551 next = (cur + obj->size()); |
342 | 552 } |
4839 | 553 |
554 // If we finish the above loop...We have a parseable object that | |
555 // begins on or before the start of the memory region, and ends | |
556 // inside or spans the entire region. | |
557 | |
558 assert(obj == oop(cur), "sanity"); | |
559 assert(cur <= start && | |
560 obj->klass_or_null() != NULL && | |
561 (cur + obj->size()) > start, | |
342 | 562 "Loop postcondition"); |
4839 | 563 |
342 | 564 if (!g1h->is_obj_dead(obj)) { |
565 obj->oop_iterate(cl, mr); | |
566 } | |
567 | |
4839 | 568 while (cur < end) { |
342 | 569 obj = oop(cur); |
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570 if (obj->klass_or_null() == NULL) { |
342 | 571 // Ran into an unparseable point. |
572 return cur; | |
573 }; | |
4839 | 574 |
342 | 575 // Otherwise: |
576 next = (cur + obj->size()); | |
4839 | 577 |
342 | 578 if (!g1h->is_obj_dead(obj)) { |
4839 | 579 if (next < end || !obj->is_objArray()) { |
580 // This object either does not span the MemRegion | |
581 // boundary, or if it does it's not an array. | |
582 // Apply closure to whole object. | |
342 | 583 obj->oop_iterate(cl); |
584 } else { | |
4839 | 585 // This obj is an array that spans the boundary. |
586 // Stop at the boundary. | |
587 obj->oop_iterate(cl, mr); | |
342 | 588 } |
589 } | |
590 cur = next; | |
591 } | |
592 return NULL; | |
593 } | |
594 | |
12080 | 595 // Code roots support |
596 | |
597 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
598 HeapRegionRemSet* hrrs = rem_set(); | |
599 hrrs->add_strong_code_root(nm); | |
600 } | |
601 | |
602 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
603 HeapRegionRemSet* hrrs = rem_set(); | |
604 hrrs->remove_strong_code_root(nm); | |
605 } | |
606 | |
607 void HeapRegion::migrate_strong_code_roots() { | |
608 assert(in_collection_set(), "only collection set regions"); | |
609 assert(!isHumongous(), "not humongous regions"); | |
610 | |
611 HeapRegionRemSet* hrrs = rem_set(); | |
612 hrrs->migrate_strong_code_roots(); | |
613 } | |
614 | |
615 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
616 HeapRegionRemSet* hrrs = rem_set(); | |
617 hrrs->strong_code_roots_do(blk); | |
618 } | |
619 | |
620 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
621 const HeapRegion* _hr; | |
622 nmethod* _nm; | |
623 bool _failures; | |
624 bool _has_oops_in_region; | |
625 | |
626 template <class T> void do_oop_work(T* p) { | |
627 T heap_oop = oopDesc::load_heap_oop(p); | |
628 if (!oopDesc::is_null(heap_oop)) { | |
629 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
630 | |
631 // Note: not all the oops embedded in the nmethod are in the | |
632 // current region. We only look at those which are. | |
633 if (_hr->is_in(obj)) { | |
634 // Object is in the region. Check that its less than top | |
635 if (_hr->top() <= (HeapWord*)obj) { | |
636 // Object is above top | |
637 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
638 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
639 "top "PTR_FORMAT, | |
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640 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
12080 | 641 _failures = true; |
642 return; | |
643 } | |
644 // Nmethod has at least one oop in the current region | |
645 _has_oops_in_region = true; | |
646 } | |
647 } | |
648 } | |
649 | |
650 public: | |
651 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
652 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
653 | |
654 void do_oop(narrowOop* p) { do_oop_work(p); } | |
655 void do_oop(oop* p) { do_oop_work(p); } | |
656 | |
657 bool failures() { return _failures; } | |
658 bool has_oops_in_region() { return _has_oops_in_region; } | |
659 }; | |
660 | |
661 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
662 const HeapRegion* _hr; | |
663 bool _failures; | |
664 public: | |
665 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
666 _hr(hr), _failures(false) {} | |
667 | |
668 void do_code_blob(CodeBlob* cb) { | |
669 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
670 if (nm != NULL) { | |
671 // Verify that the nemthod is live | |
672 if (!nm->is_alive()) { | |
673 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
674 PTR_FORMAT" in its strong code roots", | |
675 _hr->bottom(), _hr->end(), nm); | |
676 _failures = true; | |
677 } else { | |
678 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
679 nm->oops_do(&oop_cl); | |
680 if (!oop_cl.has_oops_in_region()) { | |
681 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
682 PTR_FORMAT" in its strong code roots " | |
683 "with no pointers into region", | |
684 _hr->bottom(), _hr->end(), nm); | |
685 _failures = true; | |
686 } else if (oop_cl.failures()) { | |
687 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
688 "failures for nmethod "PTR_FORMAT, | |
689 _hr->bottom(), _hr->end(), nm); | |
690 _failures = true; | |
691 } | |
692 } | |
693 } | |
694 } | |
695 | |
696 bool failures() { return _failures; } | |
697 }; | |
698 | |
699 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
700 if (!G1VerifyHeapRegionCodeRoots) { | |
701 // We're not verifying code roots. | |
702 return; | |
703 } | |
704 if (vo == VerifyOption_G1UseMarkWord) { | |
705 // Marking verification during a full GC is performed after class | |
706 // unloading, code cache unloading, etc so the strong code roots | |
707 // attached to each heap region are in an inconsistent state. They won't | |
708 // be consistent until the strong code roots are rebuilt after the | |
709 // actual GC. Skip verifying the strong code roots in this particular | |
710 // time. | |
711 assert(VerifyDuringGC, "only way to get here"); | |
712 return; | |
713 } | |
714 | |
715 HeapRegionRemSet* hrrs = rem_set(); | |
716 int strong_code_roots_length = hrrs->strong_code_roots_list_length(); | |
717 | |
718 // if this region is empty then there should be no entries | |
719 // on its strong code root list | |
720 if (is_empty()) { | |
721 if (strong_code_roots_length > 0) { | |
722 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
723 "but has "INT32_FORMAT" code root entries", | |
724 bottom(), end(), strong_code_roots_length); | |
725 *failures = true; | |
726 } | |
727 return; | |
728 } | |
729 | |
730 // An H-region should have an empty strong code root list | |
731 if (isHumongous()) { | |
732 if (strong_code_roots_length > 0) { | |
733 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " | |
734 "but has "INT32_FORMAT" code root entries", | |
735 bottom(), end(), strong_code_roots_length); | |
736 *failures = true; | |
737 } | |
738 return; | |
739 } | |
740 | |
741 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
742 strong_code_roots_do(&cb_cl); | |
743 | |
744 if (cb_cl.failures()) { | |
745 *failures = true; | |
746 } | |
747 } | |
748 | |
342 | 749 void HeapRegion::print() const { print_on(gclog_or_tty); } |
750 void HeapRegion::print_on(outputStream* st) const { | |
751 if (isHumongous()) { | |
752 if (startsHumongous()) | |
753 st->print(" HS"); | |
754 else | |
755 st->print(" HC"); | |
756 } else { | |
757 st->print(" "); | |
758 } | |
759 if (in_collection_set()) | |
760 st->print(" CS"); | |
761 else | |
762 st->print(" "); | |
763 if (is_young()) | |
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764 st->print(is_survivor() ? " SU" : " Y "); |
342 | 765 else |
766 st->print(" "); | |
767 if (is_empty()) | |
768 st->print(" F"); | |
769 else | |
770 st->print(" "); | |
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771 st->print(" TS %5d", _gc_time_stamp); |
1388 | 772 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
773 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 774 G1OffsetTableContigSpace::print_on(st); |
775 } | |
776 | |
12080 | 777 class VerifyLiveClosure: public OopClosure { |
778 private: | |
779 G1CollectedHeap* _g1h; | |
780 CardTableModRefBS* _bs; | |
781 oop _containing_obj; | |
782 bool _failures; | |
783 int _n_failures; | |
784 VerifyOption _vo; | |
785 public: | |
786 // _vo == UsePrevMarking -> use "prev" marking information, | |
787 // _vo == UseNextMarking -> use "next" marking information, | |
788 // _vo == UseMarkWord -> use mark word from object header. | |
789 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
790 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
791 _failures(false), _n_failures(0), _vo(vo) | |
792 { | |
793 BarrierSet* bs = _g1h->barrier_set(); | |
794 if (bs->is_a(BarrierSet::CardTableModRef)) | |
795 _bs = (CardTableModRefBS*)bs; | |
796 } | |
797 | |
798 void set_containing_obj(oop obj) { | |
799 _containing_obj = obj; | |
800 } | |
801 | |
802 bool failures() { return _failures; } | |
803 int n_failures() { return _n_failures; } | |
804 | |
805 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
806 virtual void do_oop( oop* p) { do_oop_work(p); } | |
807 | |
808 void print_object(outputStream* out, oop obj) { | |
809 #ifdef PRODUCT | |
810 Klass* k = obj->klass(); | |
811 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
812 out->print_cr("class name %s", class_name); | |
813 #else // PRODUCT | |
814 obj->print_on(out); | |
815 #endif // PRODUCT | |
816 } | |
817 | |
818 template <class T> | |
819 void do_oop_work(T* p) { | |
820 assert(_containing_obj != NULL, "Precondition"); | |
821 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
822 "Precondition"); | |
823 T heap_oop = oopDesc::load_heap_oop(p); | |
824 if (!oopDesc::is_null(heap_oop)) { | |
825 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
826 bool failed = false; | |
827 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
828 MutexLockerEx x(ParGCRareEvent_lock, | |
829 Mutex::_no_safepoint_check_flag); | |
830 | |
831 if (!_failures) { | |
832 gclog_or_tty->print_cr(""); | |
833 gclog_or_tty->print_cr("----------"); | |
834 } | |
835 if (!_g1h->is_in_closed_subset(obj)) { | |
836 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
837 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
838 " of live obj "PTR_FORMAT" in region " | |
839 "["PTR_FORMAT", "PTR_FORMAT")", | |
840 p, (void*) _containing_obj, | |
841 from->bottom(), from->end()); | |
842 print_object(gclog_or_tty, _containing_obj); | |
843 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
844 (void*) obj); | |
845 } else { | |
846 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
847 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
848 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
849 " of live obj "PTR_FORMAT" in region " | |
850 "["PTR_FORMAT", "PTR_FORMAT")", | |
851 p, (void*) _containing_obj, | |
852 from->bottom(), from->end()); | |
853 print_object(gclog_or_tty, _containing_obj); | |
854 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
855 "["PTR_FORMAT", "PTR_FORMAT")", | |
856 (void*) obj, to->bottom(), to->end()); | |
857 print_object(gclog_or_tty, obj); | |
858 } | |
859 gclog_or_tty->print_cr("----------"); | |
860 gclog_or_tty->flush(); | |
861 _failures = true; | |
862 failed = true; | |
863 _n_failures++; | |
864 } | |
865 | |
866 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
867 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
868 HeapRegion* to = _g1h->heap_region_containing(obj); | |
869 if (from != NULL && to != NULL && | |
870 from != to && | |
871 !to->isHumongous()) { | |
872 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
873 jbyte cv_field = *_bs->byte_for_const(p); | |
874 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
875 | |
876 bool is_bad = !(from->is_young() | |
877 || to->rem_set()->contains_reference(p) | |
878 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
879 (_containing_obj->is_objArray() ? | |
880 cv_field == dirty | |
881 : cv_obj == dirty || cv_field == dirty)); | |
882 if (is_bad) { | |
883 MutexLockerEx x(ParGCRareEvent_lock, | |
884 Mutex::_no_safepoint_check_flag); | |
885 | |
886 if (!_failures) { | |
887 gclog_or_tty->print_cr(""); | |
888 gclog_or_tty->print_cr("----------"); | |
889 } | |
890 gclog_or_tty->print_cr("Missing rem set entry:"); | |
891 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
892 "of obj "PTR_FORMAT", " | |
893 "in region "HR_FORMAT, | |
894 p, (void*) _containing_obj, | |
895 HR_FORMAT_PARAMS(from)); | |
896 _containing_obj->print_on(gclog_or_tty); | |
897 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
898 "in region "HR_FORMAT, | |
899 (void*) obj, | |
900 HR_FORMAT_PARAMS(to)); | |
901 obj->print_on(gclog_or_tty); | |
902 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
903 cv_obj, cv_field); | |
904 gclog_or_tty->print_cr("----------"); | |
905 gclog_or_tty->flush(); | |
906 _failures = true; | |
907 if (!failed) _n_failures++; | |
908 } | |
909 } | |
910 } | |
911 } | |
912 } | |
913 }; | |
811 | 914 |
342 | 915 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
916 // We would need a mechanism to make that code skip dead objects. | |
917 | |
6008 | 918 void HeapRegion::verify(VerifyOption vo, |
1020
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parents:
942
diff
changeset
|
919 bool* failures) const { |
342 | 920 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
diff
changeset
|
921 *failures = false; |
342 | 922 HeapWord* p = bottom(); |
923 HeapWord* prev_p = NULL; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
924 VerifyLiveClosure vl_cl(g1, vo); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
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|
925 bool is_humongous = isHumongous(); |
2133
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diff
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|
926 bool do_bot_verify = !is_young(); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
927 size_t object_num = 0; |
342 | 928 while (p < top()) { |
2133
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tonyp
parents:
1972
diff
changeset
|
929 oop obj = oop(p); |
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parents:
1972
diff
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|
930 size_t obj_size = obj->size(); |
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parents:
1972
diff
changeset
|
931 object_num += 1; |
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parents:
1972
diff
changeset
|
932 |
2250ee17e258
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1972
diff
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|
933 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
934 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
|
935 SIZE_FORMAT" words) in a %shumongous region", |
2133
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tonyp
parents:
1972
diff
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|
936 p, g1->isHumongous(obj_size) ? "" : "non-", |
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tonyp
parents:
1972
diff
changeset
|
937 obj_size, is_humongous ? "" : "non-"); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
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|
938 *failures = true; |
2133
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parents:
1972
diff
changeset
|
939 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
940 } |
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1972
diff
changeset
|
941 |
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diff
changeset
|
942 // If it returns false, verify_for_object() will output the |
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tonyp
parents:
1972
diff
changeset
|
943 // appropriate messasge. |
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parents:
1972
diff
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|
944 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
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1972
diff
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|
945 *failures = true; |
2250ee17e258
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parents:
1972
diff
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|
946 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
947 } |
2133
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|
948 |
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
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|
949 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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diff
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|
950 if (obj->is_oop()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
951 Klass* klass = obj->klass(); |
11034 | 952 if (!klass->is_metaspace_object()) { |
2133
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tonyp
parents:
1972
diff
changeset
|
953 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
|
954 "not metadata", klass, (void *)obj); |
2133
2250ee17e258
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1972
diff
changeset
|
955 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
956 return; |
2250ee17e258
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parents:
1972
diff
changeset
|
957 } else if (!klass->is_klass()) { |
2250ee17e258
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parents:
1972
diff
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|
958 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
|
959 "not a klass", klass, (void *)obj); |
2133
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parents:
1972
diff
changeset
|
960 *failures = true; |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
961 return; |
2250ee17e258
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parents:
1972
diff
changeset
|
962 } else { |
2250ee17e258
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1972
diff
changeset
|
963 vl_cl.set_containing_obj(obj); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
964 obj->oop_iterate_no_header(&vl_cl); |
2133
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parents:
1972
diff
changeset
|
965 if (vl_cl.failures()) { |
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parents:
1972
diff
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|
966 *failures = true; |
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parents:
1972
diff
changeset
|
967 } |
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parents:
1972
diff
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|
968 if (G1MaxVerifyFailures >= 0 && |
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parents:
1972
diff
changeset
|
969 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
970 return; |
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tonyp
parents:
1972
diff
changeset
|
971 } |
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parents:
1972
diff
changeset
|
972 } |
2250ee17e258
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diff
changeset
|
973 } else { |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
974 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); |
1020
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6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
975 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
976 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
977 } |
342 | 978 } |
979 prev_p = p; | |
2133
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diff
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|
980 p += obj_size; |
2250ee17e258
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parents:
1972
diff
changeset
|
981 } |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
982 |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
983 if (p != top()) { |
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parents:
1972
diff
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|
984 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
2250ee17e258
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1972
diff
changeset
|
985 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
986 *failures = true; |
2250ee17e258
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parents:
1972
diff
changeset
|
987 return; |
342 | 988 } |
2133
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parents:
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diff
changeset
|
989 |
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tonyp
parents:
1972
diff
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|
990 HeapWord* the_end = end(); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
991 assert(p == top(), "it should still hold"); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
992 // Do some extra BOT consistency checking for addresses in the |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
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diff
changeset
|
993 // range [top, end). BOT look-ups in this range should yield |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
994 // top. No point in doing that if top == end (there's nothing there). |
2250ee17e258
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parents:
1972
diff
changeset
|
995 if (p < the_end) { |
2250ee17e258
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parents:
1972
diff
changeset
|
996 // Look up top |
2250ee17e258
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parents:
1972
diff
changeset
|
997 HeapWord* addr_1 = p; |
2250ee17e258
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parents:
1972
diff
changeset
|
998 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
999 if (b_start_1 != p) { |
2250ee17e258
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parents:
1972
diff
changeset
|
1000 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1001 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1002 addr_1, b_start_1, p); |
2250ee17e258
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parents:
1972
diff
changeset
|
1003 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
1004 return; |
2250ee17e258
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parents:
1972
diff
changeset
|
1005 } |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1006 |
2250ee17e258
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parents:
1972
diff
changeset
|
1007 // Look up top + 1 |
2250ee17e258
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parents:
1972
diff
changeset
|
1008 HeapWord* addr_2 = p + 1; |
2250ee17e258
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parents:
1972
diff
changeset
|
1009 if (addr_2 < the_end) { |
2250ee17e258
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parents:
1972
diff
changeset
|
1010 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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parents:
1972
diff
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|
1011 if (b_start_2 != p) { |
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parents:
1972
diff
changeset
|
1012 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
2250ee17e258
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1972
diff
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|
1013 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
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diff
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|
1014 addr_2, b_start_2, p); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
changeset
|
1015 *failures = true; |
ff2402f6a50b
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tonyp
parents:
942
diff
changeset
|
1016 return; |
2133
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parents:
1972
diff
changeset
|
1017 } |
2250ee17e258
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diff
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|
1018 } |
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parents:
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diff
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|
1019 |
2250ee17e258
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parents:
1972
diff
changeset
|
1020 // Look up an address between top and end |
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diff
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|
1021 size_t diff = pointer_delta(the_end, p) / 2; |
2250ee17e258
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diff
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1022 HeapWord* addr_3 = p + diff; |
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parents:
1972
diff
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|
1023 if (addr_3 < the_end) { |
2250ee17e258
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parents:
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diff
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|
1024 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
2250ee17e258
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parents:
1972
diff
changeset
|
1025 if (b_start_3 != p) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
1026 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1027 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1028 addr_3, b_start_3, p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1029 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1030 return; |
2250ee17e258
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parents:
1972
diff
changeset
|
1031 } |
2250ee17e258
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parents:
1972
diff
changeset
|
1032 } |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1033 |
2250ee17e258
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parents:
1972
diff
changeset
|
1034 // Loook up end - 1 |
2250ee17e258
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parents:
1972
diff
changeset
|
1035 HeapWord* addr_4 = the_end - 1; |
2250ee17e258
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parents:
1972
diff
changeset
|
1036 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1037 if (b_start_4 != p) { |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1038 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1039 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1040 addr_4, b_start_4, p); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1041 *failures = true; |
2250ee17e258
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parents:
1972
diff
changeset
|
1042 return; |
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1043 } |
342 | 1044 } |
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1045 |
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1046 if (is_humongous && object_num > 1) { |
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1047 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1048 "but has "SIZE_FORMAT", objects", |
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1049 bottom(), end(), object_num); |
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1050 *failures = true; |
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1051 return; |
342 | 1052 } |
12080 | 1053 |
1054 verify_strong_code_roots(vo, failures); | |
1055 } | |
1056 | |
1057 void HeapRegion::verify() const { | |
1058 bool dummy = false; | |
1059 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
342 | 1060 } |
1061 | |
1062 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
1063 // away eventually. | |
1064 | |
356 | 1065 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
1066 ContiguousSpace::clear(mangle_space); | |
342 | 1067 _offsets.zero_bottom_entry(); |
1068 _offsets.initialize_threshold(); | |
1069 } | |
1070 | |
1071 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
1072 Space::set_bottom(new_bottom); | |
1073 _offsets.set_bottom(new_bottom); | |
1074 } | |
1075 | |
1076 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
1077 Space::set_end(new_end); | |
1078 _offsets.resize(new_end - bottom()); | |
1079 } | |
1080 | |
1081 void G1OffsetTableContigSpace::print() const { | |
1082 print_short(); | |
1083 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
1084 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
1085 bottom(), top(), _offsets.threshold(), end()); | |
1086 } | |
1087 | |
1088 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
1089 return _offsets.initialize_threshold(); | |
1090 } | |
1091 | |
1092 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
1093 HeapWord* end) { | |
1094 _offsets.alloc_block(start, end); | |
1095 return _offsets.threshold(); | |
1096 } | |
1097 | |
1098 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
1099 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1100 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
1101 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
1102 return top(); | |
1103 else | |
1104 return ContiguousSpace::saved_mark_word(); | |
1105 } | |
1106 | |
1107 void G1OffsetTableContigSpace::set_saved_mark() { | |
1108 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1109 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
1110 | |
1111 if (_gc_time_stamp < curr_gc_time_stamp) { | |
1112 // The order of these is important, as another thread might be | |
1113 // about to start scanning this region. If it does so after | |
1114 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
1115 // will be false, and it will pick up top() as the high water mark | |
1116 // of region. If it does so after _gc_time_stamp = ..., then it | |
1117 // will pick up the right saved_mark_word() as the high water mark | |
1118 // of the region. Either way, the behaviour will be correct. | |
1119 ContiguousSpace::set_saved_mark(); | |
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1120 OrderAccess::storestore(); |
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1121 _gc_time_stamp = curr_gc_time_stamp; |
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1122 // No need to do another barrier to flush the writes above. If |
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1123 // this is called in parallel with other threads trying to |
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1124 // allocate into the region, the caller should call this while |
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1125 // holding a lock and when the lock is released the writes will be |
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1126 // flushed. |
342 | 1127 } |
1128 } | |
1129 | |
1130 G1OffsetTableContigSpace:: | |
1131 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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1132 MemRegion mr) : |
342 | 1133 _offsets(sharedOffsetArray, mr), |
1134 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1135 _gc_time_stamp(0) | |
1136 { | |
1137 _offsets.set_space(this); | |
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1138 // false ==> we'll do the clearing if there's clearing to be done. |
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1139 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
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1140 _offsets.zero_bottom_entry(); |
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1141 _offsets.initialize_threshold(); |
342 | 1142 } |