Mercurial > hg > truffle
annotate src/share/vm/memory/space.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 89152779163c 78bbf4d43a14 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "classfile/vmSymbols.hpp" | |
| 28 #include "gc_implementation/shared/liveRange.hpp" | |
| 29 #include "gc_implementation/shared/markSweep.hpp" | |
| 30 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 31 #include "memory/blockOffsetTable.inline.hpp" | |
| 32 #include "memory/defNewGeneration.hpp" | |
| 33 #include "memory/genCollectedHeap.hpp" | |
| 34 #include "memory/space.hpp" | |
| 35 #include "memory/space.inline.hpp" | |
| 36 #include "memory/universe.inline.hpp" | |
| 37 #include "oops/oop.inline.hpp" | |
| 38 #include "oops/oop.inline2.hpp" | |
| 39 #include "runtime/java.hpp" | |
| 40 #include "runtime/safepoint.hpp" | |
| 41 #include "utilities/copy.hpp" | |
| 42 #include "utilities/globalDefinitions.hpp" | |
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43 #include "utilities/macros.hpp" |
| 0 | 44 |
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45 void SpaceMemRegionOopsIterClosure::do_oop(oop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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46 void SpaceMemRegionOopsIterClosure::do_oop(narrowOop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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47 |
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48 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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49 |
| 0 | 50 HeapWord* DirtyCardToOopClosure::get_actual_top(HeapWord* top, |
| 51 HeapWord* top_obj) { | |
| 52 if (top_obj != NULL) { | |
| 53 if (_sp->block_is_obj(top_obj)) { | |
| 54 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
| 55 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
| 56 // An arrayOop is starting on the dirty card - since we do exact | |
| 57 // store checks for objArrays we are done. | |
| 58 } else { | |
| 59 // Otherwise, it is possible that the object starting on the dirty | |
| 60 // card spans the entire card, and that the store happened on a | |
| 61 // later card. Figure out where the object ends. | |
| 62 // Use the block_size() method of the space over which | |
| 63 // the iteration is being done. That space (e.g. CMS) may have | |
| 64 // specific requirements on object sizes which will | |
| 65 // be reflected in the block_size() method. | |
| 66 top = top_obj + oop(top_obj)->size(); | |
| 67 } | |
| 68 } | |
| 69 } else { | |
| 70 top = top_obj; | |
| 71 } | |
| 72 } else { | |
| 73 assert(top == _sp->end(), "only case where top_obj == NULL"); | |
| 74 } | |
| 75 return top; | |
| 76 } | |
| 77 | |
| 78 void DirtyCardToOopClosure::walk_mem_region(MemRegion mr, | |
| 79 HeapWord* bottom, | |
| 80 HeapWord* top) { | |
| 81 // 1. Blocks may or may not be objects. | |
| 82 // 2. Even when a block_is_obj(), it may not entirely | |
| 83 // occupy the block if the block quantum is larger than | |
| 84 // the object size. | |
| 85 // We can and should try to optimize by calling the non-MemRegion | |
| 86 // version of oop_iterate() for all but the extremal objects | |
| 87 // (for which we need to call the MemRegion version of | |
| 88 // oop_iterate()) To be done post-beta XXX | |
| 89 for (; bottom < top; bottom += _sp->block_size(bottom)) { | |
| 90 // As in the case of contiguous space above, we'd like to | |
| 91 // just use the value returned by oop_iterate to increment the | |
| 92 // current pointer; unfortunately, that won't work in CMS because | |
| 93 // we'd need an interface change (it seems) to have the space | |
| 94 // "adjust the object size" (for instance pad it up to its | |
| 95 // block alignment or minimum block size restrictions. XXX | |
| 96 if (_sp->block_is_obj(bottom) && | |
| 97 !_sp->obj_allocated_since_save_marks(oop(bottom))) { | |
| 98 oop(bottom)->oop_iterate(_cl, mr); | |
| 99 } | |
| 100 } | |
| 101 } | |
| 102 | |
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103 // We get called with "mr" representing the dirty region |
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104 // that we want to process. Because of imprecise marking, |
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105 // we may need to extend the incoming "mr" to the right, |
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106 // and scan more. However, because we may already have |
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107 // scanned some of that extended region, we may need to |
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108 // trim its right-end back some so we do not scan what |
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109 // we (or another worker thread) may already have scanned |
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110 // or planning to scan. |
| 0 | 111 void DirtyCardToOopClosure::do_MemRegion(MemRegion mr) { |
| 112 | |
| 113 // Some collectors need to do special things whenever their dirty | |
| 114 // cards are processed. For instance, CMS must remember mutator updates | |
| 115 // (i.e. dirty cards) so as to re-scan mutated objects. | |
| 116 // Such work can be piggy-backed here on dirty card scanning, so as to make | |
| 117 // it slightly more efficient than doing a complete non-detructive pre-scan | |
| 118 // of the card table. | |
| 119 MemRegionClosure* pCl = _sp->preconsumptionDirtyCardClosure(); | |
| 120 if (pCl != NULL) { | |
| 121 pCl->do_MemRegion(mr); | |
| 122 } | |
| 123 | |
| 124 HeapWord* bottom = mr.start(); | |
| 125 HeapWord* last = mr.last(); | |
| 126 HeapWord* top = mr.end(); | |
| 127 HeapWord* bottom_obj; | |
| 128 HeapWord* top_obj; | |
| 129 | |
| 130 assert(_precision == CardTableModRefBS::ObjHeadPreciseArray || | |
| 131 _precision == CardTableModRefBS::Precise, | |
| 132 "Only ones we deal with for now."); | |
| 133 | |
| 134 assert(_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
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135 _cl->idempotent() || _last_bottom == NULL || |
| 0 | 136 top <= _last_bottom, |
| 137 "Not decreasing"); | |
| 138 NOT_PRODUCT(_last_bottom = mr.start()); | |
| 139 | |
| 140 bottom_obj = _sp->block_start(bottom); | |
| 141 top_obj = _sp->block_start(last); | |
| 142 | |
| 143 assert(bottom_obj <= bottom, "just checking"); | |
| 144 assert(top_obj <= top, "just checking"); | |
| 145 | |
| 146 // Given what we think is the top of the memory region and | |
| 147 // the start of the object at the top, get the actual | |
| 148 // value of the top. | |
| 149 top = get_actual_top(top, top_obj); | |
| 150 | |
| 151 // If the previous call did some part of this region, don't redo. | |
| 152 if (_precision == CardTableModRefBS::ObjHeadPreciseArray && | |
| 153 _min_done != NULL && | |
| 154 _min_done < top) { | |
| 155 top = _min_done; | |
| 156 } | |
| 157 | |
| 158 // Top may have been reset, and in fact may be below bottom, | |
| 159 // e.g. the dirty card region is entirely in a now free object | |
| 160 // -- something that could happen with a concurrent sweeper. | |
| 161 bottom = MIN2(bottom, top); | |
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162 MemRegion extended_mr = MemRegion(bottom, top); |
| 0 | 163 assert(bottom <= top && |
| 164 (_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
| 165 _min_done == NULL || | |
| 166 top <= _min_done), | |
| 167 "overlap!"); | |
| 168 | |
| 169 // Walk the region if it is not empty; otherwise there is nothing to do. | |
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170 if (!extended_mr.is_empty()) { |
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171 walk_mem_region(extended_mr, bottom_obj, top); |
| 0 | 172 } |
| 173 | |
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174 // An idempotent closure might be applied in any order, so we don't |
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175 // record a _min_done for it. |
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176 if (!_cl->idempotent()) { |
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177 _min_done = bottom; |
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178 } else { |
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179 assert(_min_done == _last_explicit_min_done, |
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180 "Don't update _min_done for idempotent cl"); |
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181 } |
| 0 | 182 } |
| 183 | |
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184 DirtyCardToOopClosure* Space::new_dcto_cl(ExtendedOopClosure* cl, |
| 0 | 185 CardTableModRefBS::PrecisionStyle precision, |
| 186 HeapWord* boundary) { | |
| 187 return new DirtyCardToOopClosure(this, cl, precision, boundary); | |
| 188 } | |
| 189 | |
| 190 HeapWord* ContiguousSpaceDCTOC::get_actual_top(HeapWord* top, | |
| 191 HeapWord* top_obj) { | |
| 192 if (top_obj != NULL && top_obj < (_sp->toContiguousSpace())->top()) { | |
| 193 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
| 194 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
| 195 // An arrayOop is starting on the dirty card - since we do exact | |
| 196 // store checks for objArrays we are done. | |
| 197 } else { | |
| 198 // Otherwise, it is possible that the object starting on the dirty | |
| 199 // card spans the entire card, and that the store happened on a | |
| 200 // later card. Figure out where the object ends. | |
| 201 assert(_sp->block_size(top_obj) == (size_t) oop(top_obj)->size(), | |
| 202 "Block size and object size mismatch"); | |
| 203 top = top_obj + oop(top_obj)->size(); | |
| 204 } | |
| 205 } | |
| 206 } else { | |
| 207 top = (_sp->toContiguousSpace())->top(); | |
| 208 } | |
| 209 return top; | |
| 210 } | |
| 211 | |
| 212 void Filtering_DCTOC::walk_mem_region(MemRegion mr, | |
| 213 HeapWord* bottom, | |
| 214 HeapWord* top) { | |
| 215 // Note that this assumption won't hold if we have a concurrent | |
| 216 // collector in this space, which may have freed up objects after | |
| 217 // they were dirtied and before the stop-the-world GC that is | |
| 218 // examining cards here. | |
| 219 assert(bottom < top, "ought to be at least one obj on a dirty card."); | |
| 220 | |
| 221 if (_boundary != NULL) { | |
| 222 // We have a boundary outside of which we don't want to look | |
| 223 // at objects, so create a filtering closure around the | |
| 224 // oop closure before walking the region. | |
| 225 FilteringClosure filter(_boundary, _cl); | |
| 226 walk_mem_region_with_cl(mr, bottom, top, &filter); | |
| 227 } else { | |
| 228 // No boundary, simply walk the heap with the oop closure. | |
| 229 walk_mem_region_with_cl(mr, bottom, top, _cl); | |
| 230 } | |
| 231 | |
| 232 } | |
| 233 | |
| 234 // We must replicate this so that the static type of "FilteringClosure" | |
| 235 // (see above) is apparent at the oop_iterate calls. | |
| 236 #define ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(ClosureType) \ | |
| 237 void ContiguousSpaceDCTOC::walk_mem_region_with_cl(MemRegion mr, \ | |
| 238 HeapWord* bottom, \ | |
| 239 HeapWord* top, \ | |
| 240 ClosureType* cl) { \ | |
| 241 bottom += oop(bottom)->oop_iterate(cl, mr); \ | |
| 242 if (bottom < top) { \ | |
| 243 HeapWord* next_obj = bottom + oop(bottom)->size(); \ | |
| 244 while (next_obj < top) { \ | |
| 245 /* Bottom lies entirely below top, so we can call the */ \ | |
| 246 /* non-memRegion version of oop_iterate below. */ \ | |
| 247 oop(bottom)->oop_iterate(cl); \ | |
| 248 bottom = next_obj; \ | |
| 249 next_obj = bottom + oop(bottom)->size(); \ | |
| 250 } \ | |
| 251 /* Last object. */ \ | |
| 252 oop(bottom)->oop_iterate(cl, mr); \ | |
| 253 } \ | |
| 254 } | |
| 255 | |
| 256 // (There are only two of these, rather than N, because the split is due | |
| 257 // only to the introduction of the FilteringClosure, a local part of the | |
| 258 // impl of this abstraction.) | |
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259 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(ExtendedOopClosure) |
| 0 | 260 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(FilteringClosure) |
| 261 | |
| 262 DirtyCardToOopClosure* | |
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263 ContiguousSpace::new_dcto_cl(ExtendedOopClosure* cl, |
| 0 | 264 CardTableModRefBS::PrecisionStyle precision, |
| 265 HeapWord* boundary) { | |
| 266 return new ContiguousSpaceDCTOC(this, cl, precision, boundary); | |
| 267 } | |
| 268 | |
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269 void Space::initialize(MemRegion mr, |
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270 bool clear_space, |
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271 bool mangle_space) { |
| 0 | 272 HeapWord* bottom = mr.start(); |
| 273 HeapWord* end = mr.end(); | |
| 274 assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end), | |
| 275 "invalid space boundaries"); | |
| 276 set_bottom(bottom); | |
| 277 set_end(end); | |
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278 if (clear_space) clear(mangle_space); |
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279 } |
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280 |
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281 void Space::clear(bool mangle_space) { |
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282 if (ZapUnusedHeapArea && mangle_space) { |
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283 mangle_unused_area(); |
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284 } |
| 0 | 285 } |
| 286 | |
| 356 | 287 ContiguousSpace::ContiguousSpace(): CompactibleSpace(), _top(NULL), |
| 288 _concurrent_iteration_safe_limit(NULL) { | |
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289 _mangler = new GenSpaceMangler(this); |
| 0 | 290 } |
| 291 | |
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292 ContiguousSpace::~ContiguousSpace() { |
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293 delete _mangler; |
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294 } |
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295 |
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296 void ContiguousSpace::initialize(MemRegion mr, |
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297 bool clear_space, |
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298 bool mangle_space) |
| 0 | 299 { |
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300 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
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301 set_concurrent_iteration_safe_limit(top()); |
| 0 | 302 } |
| 303 | |
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304 void ContiguousSpace::clear(bool mangle_space) { |
| 0 | 305 set_top(bottom()); |
| 306 set_saved_mark(); | |
| 356 | 307 CompactibleSpace::clear(mangle_space); |
| 0 | 308 } |
| 309 | |
| 310 bool ContiguousSpace::is_in(const void* p) const { | |
| 311 return _bottom <= p && p < _top; | |
| 312 } | |
| 313 | |
| 314 bool ContiguousSpace::is_free_block(const HeapWord* p) const { | |
| 315 return p >= _top; | |
| 316 } | |
| 317 | |
|
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318 void OffsetTableContigSpace::clear(bool mangle_space) { |
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319 ContiguousSpace::clear(mangle_space); |
| 0 | 320 _offsets.initialize_threshold(); |
| 321 } | |
| 322 | |
| 323 void OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 324 Space::set_bottom(new_bottom); | |
| 325 _offsets.set_bottom(new_bottom); | |
| 326 } | |
| 327 | |
| 328 void OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 329 // Space should not advertize an increase in size | |
| 330 // until after the underlying offest table has been enlarged. | |
| 331 _offsets.resize(pointer_delta(new_end, bottom())); | |
| 332 Space::set_end(new_end); | |
| 333 } | |
| 334 | |
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335 #ifndef PRODUCT |
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336 |
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337 void ContiguousSpace::set_top_for_allocations(HeapWord* v) { |
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338 mangler()->set_top_for_allocations(v); |
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339 } |
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340 void ContiguousSpace::set_top_for_allocations() { |
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341 mangler()->set_top_for_allocations(top()); |
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342 } |
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343 void ContiguousSpace::check_mangled_unused_area(HeapWord* limit) { |
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344 mangler()->check_mangled_unused_area(limit); |
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345 } |
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346 |
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347 void ContiguousSpace::check_mangled_unused_area_complete() { |
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348 mangler()->check_mangled_unused_area_complete(); |
| 0 | 349 } |
| 350 | |
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351 // Mangled only the unused space that has not previously |
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352 // been mangled and that has not been allocated since being |
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353 // mangled. |
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354 void ContiguousSpace::mangle_unused_area() { |
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355 mangler()->mangle_unused_area(); |
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356 } |
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357 void ContiguousSpace::mangle_unused_area_complete() { |
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358 mangler()->mangle_unused_area_complete(); |
| 0 | 359 } |
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360 void ContiguousSpace::mangle_region(MemRegion mr) { |
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361 // Although this method uses SpaceMangler::mangle_region() which |
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362 // is not specific to a space, the when the ContiguousSpace version |
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363 // is called, it is always with regard to a space and this |
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364 // bounds checking is appropriate. |
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365 MemRegion space_mr(bottom(), end()); |
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366 assert(space_mr.contains(mr), "Mangling outside space"); |
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367 SpaceMangler::mangle_region(mr); |
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368 } |
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369 #endif // NOT_PRODUCT |
| 0 | 370 |
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371 void CompactibleSpace::initialize(MemRegion mr, |
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372 bool clear_space, |
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373 bool mangle_space) { |
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374 Space::initialize(mr, clear_space, mangle_space); |
| 356 | 375 set_compaction_top(bottom()); |
| 376 _next_compaction_space = NULL; | |
| 377 } | |
| 378 | |
| 379 void CompactibleSpace::clear(bool mangle_space) { | |
| 380 Space::clear(mangle_space); | |
| 0 | 381 _compaction_top = bottom(); |
| 382 } | |
| 383 | |
| 384 HeapWord* CompactibleSpace::forward(oop q, size_t size, | |
| 385 CompactPoint* cp, HeapWord* compact_top) { | |
| 386 // q is alive | |
| 387 // First check if we should switch compaction space | |
| 388 assert(this == cp->space, "'this' should be current compaction space."); | |
| 389 size_t compaction_max_size = pointer_delta(end(), compact_top); | |
| 390 while (size > compaction_max_size) { | |
| 391 // switch to next compaction space | |
| 392 cp->space->set_compaction_top(compact_top); | |
| 393 cp->space = cp->space->next_compaction_space(); | |
| 394 if (cp->space == NULL) { | |
| 395 cp->gen = GenCollectedHeap::heap()->prev_gen(cp->gen); | |
| 396 assert(cp->gen != NULL, "compaction must succeed"); | |
| 397 cp->space = cp->gen->first_compaction_space(); | |
| 398 assert(cp->space != NULL, "generation must have a first compaction space"); | |
| 399 } | |
| 400 compact_top = cp->space->bottom(); | |
| 401 cp->space->set_compaction_top(compact_top); | |
| 402 cp->threshold = cp->space->initialize_threshold(); | |
| 403 compaction_max_size = pointer_delta(cp->space->end(), compact_top); | |
| 404 } | |
| 405 | |
| 406 // store the forwarding pointer into the mark word | |
| 407 if ((HeapWord*)q != compact_top) { | |
| 408 q->forward_to(oop(compact_top)); | |
| 409 assert(q->is_gc_marked(), "encoding the pointer should preserve the mark"); | |
| 410 } else { | |
| 411 // if the object isn't moving we can just set the mark to the default | |
| 412 // mark and handle it specially later on. | |
| 413 q->init_mark(); | |
| 414 assert(q->forwardee() == NULL, "should be forwarded to NULL"); | |
| 415 } | |
| 416 | |
| 417 compact_top += size; | |
| 418 | |
| 419 // we need to update the offset table so that the beginnings of objects can be | |
| 420 // found during scavenge. Note that we are updating the offset table based on | |
| 421 // where the object will be once the compaction phase finishes. | |
| 422 if (compact_top > cp->threshold) | |
| 423 cp->threshold = | |
| 424 cp->space->cross_threshold(compact_top - size, compact_top); | |
| 425 return compact_top; | |
| 426 } | |
| 427 | |
| 428 | |
| 429 bool CompactibleSpace::insert_deadspace(size_t& allowed_deadspace_words, | |
| 430 HeapWord* q, size_t deadlength) { | |
| 431 if (allowed_deadspace_words >= deadlength) { | |
| 432 allowed_deadspace_words -= deadlength; | |
|
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433 CollectedHeap::fill_with_object(q, deadlength); |
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434 oop(q)->set_mark(oop(q)->mark()->set_marked()); |
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435 assert((int) deadlength == oop(q)->size(), "bad filler object size"); |
| 0 | 436 // Recall that we required "q == compaction_top". |
| 437 return true; | |
| 438 } else { | |
| 439 allowed_deadspace_words = 0; | |
| 440 return false; | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 #define block_is_always_obj(q) true | |
| 445 #define obj_size(q) oop(q)->size() | |
| 446 #define adjust_obj_size(s) s | |
| 447 | |
| 448 void CompactibleSpace::prepare_for_compaction(CompactPoint* cp) { | |
| 449 SCAN_AND_FORWARD(cp, end, block_is_obj, block_size); | |
| 450 } | |
| 451 | |
| 452 // Faster object search. | |
| 453 void ContiguousSpace::prepare_for_compaction(CompactPoint* cp) { | |
| 454 SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size); | |
| 455 } | |
| 456 | |
| 457 void Space::adjust_pointers() { | |
| 458 // adjust all the interior pointers to point at the new locations of objects | |
| 459 // Used by MarkSweep::mark_sweep_phase3() | |
| 460 | |
| 461 // First check to see if there is any work to be done. | |
| 462 if (used() == 0) { | |
| 463 return; // Nothing to do. | |
| 464 } | |
| 465 | |
| 466 // Otherwise... | |
| 467 HeapWord* q = bottom(); | |
| 468 HeapWord* t = end(); | |
| 469 | |
| 470 debug_only(HeapWord* prev_q = NULL); | |
| 471 while (q < t) { | |
| 472 if (oop(q)->is_gc_marked()) { | |
| 473 // q is alive | |
| 474 | |
| 475 // point all the oops to the new location | |
| 476 size_t size = oop(q)->adjust_pointers(); | |
| 477 | |
| 478 debug_only(prev_q = q); | |
| 479 | |
| 480 q += size; | |
| 481 } else { | |
| 482 // q is not a live object. But we're not in a compactible space, | |
| 483 // So we don't have live ranges. | |
| 484 debug_only(prev_q = q); | |
| 485 q += block_size(q); | |
| 486 assert(q > prev_q, "we should be moving forward through memory"); | |
| 487 } | |
| 488 } | |
| 489 assert(q == t, "just checking"); | |
| 490 } | |
| 491 | |
| 492 void CompactibleSpace::adjust_pointers() { | |
| 493 // Check first is there is any work to do. | |
| 494 if (used() == 0) { | |
| 495 return; // Nothing to do. | |
| 496 } | |
| 497 | |
| 498 SCAN_AND_ADJUST_POINTERS(adjust_obj_size); | |
| 499 } | |
| 500 | |
| 501 void CompactibleSpace::compact() { | |
| 502 SCAN_AND_COMPACT(obj_size); | |
| 503 } | |
| 504 | |
| 505 void Space::print_short() const { print_short_on(tty); } | |
| 506 | |
| 507 void Space::print_short_on(outputStream* st) const { | |
| 508 st->print(" space " SIZE_FORMAT "K, %3d%% used", capacity() / K, | |
| 509 (int) ((double) used() * 100 / capacity())); | |
| 510 } | |
| 511 | |
| 512 void Space::print() const { print_on(tty); } | |
| 513 | |
| 514 void Space::print_on(outputStream* st) const { | |
| 515 print_short_on(st); | |
| 516 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 517 bottom(), end()); | |
| 518 } | |
| 519 | |
| 520 void ContiguousSpace::print_on(outputStream* st) const { | |
| 521 print_short_on(st); | |
| 522 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 523 bottom(), top(), end()); | |
| 524 } | |
| 525 | |
| 526 void OffsetTableContigSpace::print_on(outputStream* st) const { | |
| 527 print_short_on(st); | |
| 528 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 529 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 530 bottom(), top(), _offsets.threshold(), end()); | |
| 531 } | |
| 532 | |
| 6008 | 533 void ContiguousSpace::verify() const { |
| 0 | 534 HeapWord* p = bottom(); |
| 535 HeapWord* t = top(); | |
| 536 HeapWord* prev_p = NULL; | |
| 537 while (p < t) { | |
| 538 oop(p)->verify(); | |
| 539 prev_p = p; | |
| 540 p += oop(p)->size(); | |
| 541 } | |
| 542 guarantee(p == top(), "end of last object must match end of space"); | |
| 543 if (top() != end()) { | |
|
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544 guarantee(top() == block_start_const(end()-1) && |
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545 top() == block_start_const(top()), |
| 0 | 546 "top should be start of unallocated block, if it exists"); |
| 547 } | |
| 548 } | |
| 549 | |
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550 void Space::oop_iterate(ExtendedOopClosure* blk) { |
| 0 | 551 ObjectToOopClosure blk2(blk); |
| 552 object_iterate(&blk2); | |
| 553 } | |
| 554 | |
| 555 HeapWord* Space::object_iterate_careful(ObjectClosureCareful* cl) { | |
| 556 guarantee(false, "NYI"); | |
| 557 return bottom(); | |
| 558 } | |
| 559 | |
| 560 HeapWord* Space::object_iterate_careful_m(MemRegion mr, | |
| 561 ObjectClosureCareful* cl) { | |
| 562 guarantee(false, "NYI"); | |
| 563 return bottom(); | |
| 564 } | |
| 565 | |
| 566 | |
| 567 void Space::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
| 568 assert(!mr.is_empty(), "Should be non-empty"); | |
| 569 // We use MemRegion(bottom(), end()) rather than used_region() below | |
| 570 // because the two are not necessarily equal for some kinds of | |
| 571 // spaces, in particular, certain kinds of free list spaces. | |
| 572 // We could use the more complicated but more precise: | |
| 573 // MemRegion(used_region().start(), round_to(used_region().end(), CardSize)) | |
| 574 // but the slight imprecision seems acceptable in the assertion check. | |
| 575 assert(MemRegion(bottom(), end()).contains(mr), | |
| 576 "Should be within used space"); | |
| 577 HeapWord* prev = cl->previous(); // max address from last time | |
| 578 if (prev >= mr.end()) { // nothing to do | |
| 579 return; | |
| 580 } | |
| 581 // This assert will not work when we go from cms space to perm | |
| 582 // space, and use same closure. Easy fix deferred for later. XXX YSR | |
| 583 // assert(prev == NULL || contains(prev), "Should be within space"); | |
| 584 | |
| 585 bool last_was_obj_array = false; | |
| 586 HeapWord *blk_start_addr, *region_start_addr; | |
| 587 if (prev > mr.start()) { | |
| 588 region_start_addr = prev; | |
| 589 blk_start_addr = prev; | |
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590 // The previous invocation may have pushed "prev" beyond the |
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591 // last allocated block yet there may be still be blocks |
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592 // in this region due to a particular coalescing policy. |
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593 // Relax the assertion so that the case where the unallocated |
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594 // block is maintained and "prev" is beyond the unallocated |
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595 // block does not cause the assertion to fire. |
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596 assert((BlockOffsetArrayUseUnallocatedBlock && |
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597 (!is_in(prev))) || |
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598 (blk_start_addr == block_start(region_start_addr)), "invariant"); |
| 0 | 599 } else { |
| 600 region_start_addr = mr.start(); | |
| 601 blk_start_addr = block_start(region_start_addr); | |
| 602 } | |
| 603 HeapWord* region_end_addr = mr.end(); | |
| 604 MemRegion derived_mr(region_start_addr, region_end_addr); | |
| 605 while (blk_start_addr < region_end_addr) { | |
| 606 const size_t size = block_size(blk_start_addr); | |
| 607 if (block_is_obj(blk_start_addr)) { | |
| 608 last_was_obj_array = cl->do_object_bm(oop(blk_start_addr), derived_mr); | |
| 609 } else { | |
| 610 last_was_obj_array = false; | |
| 611 } | |
| 612 blk_start_addr += size; | |
| 613 } | |
| 614 if (!last_was_obj_array) { | |
| 615 assert((bottom() <= blk_start_addr) && (blk_start_addr <= end()), | |
| 616 "Should be within (closed) used space"); | |
| 617 assert(blk_start_addr > prev, "Invariant"); | |
| 618 cl->set_previous(blk_start_addr); // min address for next time | |
| 619 } | |
| 620 } | |
| 621 | |
| 622 bool Space::obj_is_alive(const HeapWord* p) const { | |
| 623 assert (block_is_obj(p), "The address should point to an object"); | |
| 624 return true; | |
| 625 } | |
| 626 | |
| 627 void ContiguousSpace::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
| 628 assert(!mr.is_empty(), "Should be non-empty"); | |
| 629 assert(used_region().contains(mr), "Should be within used space"); | |
| 630 HeapWord* prev = cl->previous(); // max address from last time | |
| 631 if (prev >= mr.end()) { // nothing to do | |
| 632 return; | |
| 633 } | |
| 634 // See comment above (in more general method above) in case you | |
| 635 // happen to use this method. | |
| 636 assert(prev == NULL || is_in_reserved(prev), "Should be within space"); | |
| 637 | |
| 638 bool last_was_obj_array = false; | |
| 639 HeapWord *obj_start_addr, *region_start_addr; | |
| 640 if (prev > mr.start()) { | |
| 641 region_start_addr = prev; | |
| 642 obj_start_addr = prev; | |
| 643 assert(obj_start_addr == block_start(region_start_addr), "invariant"); | |
| 644 } else { | |
| 645 region_start_addr = mr.start(); | |
| 646 obj_start_addr = block_start(region_start_addr); | |
| 647 } | |
| 648 HeapWord* region_end_addr = mr.end(); | |
| 649 MemRegion derived_mr(region_start_addr, region_end_addr); | |
| 650 while (obj_start_addr < region_end_addr) { | |
| 651 oop obj = oop(obj_start_addr); | |
| 652 const size_t size = obj->size(); | |
| 653 last_was_obj_array = cl->do_object_bm(obj, derived_mr); | |
| 654 obj_start_addr += size; | |
| 655 } | |
| 656 if (!last_was_obj_array) { | |
| 657 assert((bottom() <= obj_start_addr) && (obj_start_addr <= end()), | |
| 658 "Should be within (closed) used space"); | |
| 659 assert(obj_start_addr > prev, "Invariant"); | |
| 660 cl->set_previous(obj_start_addr); // min address for next time | |
| 661 } | |
| 662 } | |
| 663 | |
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664 #if INCLUDE_ALL_GCS |
| 0 | 665 #define ContigSpace_PAR_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
| 666 \ | |
| 667 void ContiguousSpace::par_oop_iterate(MemRegion mr, OopClosureType* blk) {\ | |
| 668 HeapWord* obj_addr = mr.start(); \ | |
| 669 HeapWord* t = mr.end(); \ | |
| 670 while (obj_addr < t) { \ | |
| 671 assert(oop(obj_addr)->is_oop(), "Should be an oop"); \ | |
| 672 obj_addr += oop(obj_addr)->oop_iterate(blk); \ | |
| 673 } \ | |
| 674 } | |
| 675 | |
| 676 ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DEFN) | |
| 677 | |
| 678 #undef ContigSpace_PAR_OOP_ITERATE_DEFN | |
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679 #endif // INCLUDE_ALL_GCS |
| 0 | 680 |
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681 void ContiguousSpace::oop_iterate(ExtendedOopClosure* blk) { |
| 0 | 682 if (is_empty()) return; |
| 683 HeapWord* obj_addr = bottom(); | |
| 684 HeapWord* t = top(); | |
| 685 // Could call objects iterate, but this is easier. | |
| 686 while (obj_addr < t) { | |
| 687 obj_addr += oop(obj_addr)->oop_iterate(blk); | |
| 688 } | |
| 689 } | |
| 690 | |
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691 void ContiguousSpace::oop_iterate(MemRegion mr, ExtendedOopClosure* blk) { |
| 0 | 692 if (is_empty()) { |
| 693 return; | |
| 694 } | |
| 695 MemRegion cur = MemRegion(bottom(), top()); | |
| 696 mr = mr.intersection(cur); | |
| 697 if (mr.is_empty()) { | |
| 698 return; | |
| 699 } | |
| 700 if (mr.equals(cur)) { | |
| 701 oop_iterate(blk); | |
| 702 return; | |
| 703 } | |
| 704 assert(mr.end() <= top(), "just took an intersection above"); | |
| 705 HeapWord* obj_addr = block_start(mr.start()); | |
| 706 HeapWord* t = mr.end(); | |
| 707 | |
| 708 // Handle first object specially. | |
| 709 oop obj = oop(obj_addr); | |
| 710 SpaceMemRegionOopsIterClosure smr_blk(blk, mr); | |
| 711 obj_addr += obj->oop_iterate(&smr_blk); | |
| 712 while (obj_addr < t) { | |
| 713 oop obj = oop(obj_addr); | |
| 714 assert(obj->is_oop(), "expected an oop"); | |
| 715 obj_addr += obj->size(); | |
| 716 // If "obj_addr" is not greater than top, then the | |
| 717 // entire object "obj" is within the region. | |
| 718 if (obj_addr <= t) { | |
| 719 obj->oop_iterate(blk); | |
| 720 } else { | |
| 721 // "obj" extends beyond end of region | |
| 722 obj->oop_iterate(&smr_blk); | |
| 723 break; | |
| 724 } | |
| 725 }; | |
| 726 } | |
| 727 | |
| 728 void ContiguousSpace::object_iterate(ObjectClosure* blk) { | |
| 729 if (is_empty()) return; | |
| 730 WaterMark bm = bottom_mark(); | |
| 731 object_iterate_from(bm, blk); | |
| 732 } | |
| 733 | |
|
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734 // For a continguous space object_iterate() and safe_object_iterate() |
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735 // are the same. |
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736 void ContiguousSpace::safe_object_iterate(ObjectClosure* blk) { |
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737 object_iterate(blk); |
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738 } |
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739 |
| 0 | 740 void ContiguousSpace::object_iterate_from(WaterMark mark, ObjectClosure* blk) { |
| 741 assert(mark.space() == this, "Mark does not match space"); | |
| 742 HeapWord* p = mark.point(); | |
| 743 while (p < top()) { | |
| 744 blk->do_object(oop(p)); | |
| 745 p += oop(p)->size(); | |
| 746 } | |
| 747 } | |
| 748 | |
| 749 HeapWord* | |
| 750 ContiguousSpace::object_iterate_careful(ObjectClosureCareful* blk) { | |
| 751 HeapWord * limit = concurrent_iteration_safe_limit(); | |
| 752 assert(limit <= top(), "sanity check"); | |
| 753 for (HeapWord* p = bottom(); p < limit;) { | |
| 754 size_t size = blk->do_object_careful(oop(p)); | |
| 755 if (size == 0) { | |
| 756 return p; // failed at p | |
| 757 } else { | |
| 758 p += size; | |
| 759 } | |
| 760 } | |
| 761 return NULL; // all done | |
| 762 } | |
| 763 | |
| 764 #define ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 765 \ | |
| 766 void ContiguousSpace:: \ | |
| 767 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
| 768 HeapWord* t; \ | |
| 769 HeapWord* p = saved_mark_word(); \ | |
| 770 assert(p != NULL, "expected saved mark"); \ | |
| 771 \ | |
| 772 const intx interval = PrefetchScanIntervalInBytes; \ | |
| 773 do { \ | |
| 774 t = top(); \ | |
| 775 while (p < t) { \ | |
| 776 Prefetch::write(p, interval); \ | |
| 777 debug_only(HeapWord* prev = p); \ | |
| 778 oop m = oop(p); \ | |
| 779 p += m->oop_iterate(blk); \ | |
| 780 } \ | |
| 781 } while (t < top()); \ | |
| 782 \ | |
| 783 set_saved_mark_word(p); \ | |
| 784 } | |
| 785 | |
| 786 ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 787 | |
| 788 #undef ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN | |
| 789 | |
| 790 // Very general, slow implementation. | |
|
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791 HeapWord* ContiguousSpace::block_start_const(const void* p) const { |
|
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792 assert(MemRegion(bottom(), end()).contains(p), |
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793 err_msg("p (" PTR_FORMAT ") not in space [" PTR_FORMAT ", " PTR_FORMAT ")", |
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794 p, bottom(), end())); |
| 0 | 795 if (p >= top()) { |
| 796 return top(); | |
| 797 } else { | |
| 798 HeapWord* last = bottom(); | |
| 799 HeapWord* cur = last; | |
| 800 while (cur <= p) { | |
| 801 last = cur; | |
| 802 cur += oop(cur)->size(); | |
| 803 } | |
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804 assert(oop(last)->is_oop(), |
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805 err_msg(PTR_FORMAT " should be an object start", last)); |
| 0 | 806 return last; |
| 807 } | |
| 808 } | |
| 809 | |
| 810 size_t ContiguousSpace::block_size(const HeapWord* p) const { | |
|
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811 assert(MemRegion(bottom(), end()).contains(p), |
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812 err_msg("p (" PTR_FORMAT ") not in space [" PTR_FORMAT ", " PTR_FORMAT ")", |
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813 p, bottom(), end())); |
| 0 | 814 HeapWord* current_top = top(); |
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815 assert(p <= current_top, |
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816 err_msg("p > current top - p: " PTR_FORMAT ", current top: " PTR_FORMAT, |
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817 p, current_top)); |
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818 assert(p == current_top || oop(p)->is_oop(), |
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819 err_msg("p (" PTR_FORMAT ") is not a block start - " |
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820 "current_top: " PTR_FORMAT ", is_oop: %s", |
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821 p, current_top, BOOL_TO_STR(oop(p)->is_oop()))); |
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822 if (p < current_top) { |
| 0 | 823 return oop(p)->size(); |
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824 } else { |
| 0 | 825 assert(p == current_top, "just checking"); |
| 826 return pointer_delta(end(), (HeapWord*) p); | |
| 827 } | |
| 828 } | |
| 829 | |
| 830 // This version requires locking. | |
| 831 inline HeapWord* ContiguousSpace::allocate_impl(size_t size, | |
| 832 HeapWord* const end_value) { | |
|
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833 // In G1 there are places where a GC worker can allocates into a |
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834 // region using this serial allocation code without being prone to a |
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835 // race with other GC workers (we ensure that no other GC worker can |
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836 // access the same region at the same time). So the assert below is |
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837 // too strong in the case of G1. |
| 0 | 838 assert(Heap_lock->owned_by_self() || |
| 839 (SafepointSynchronize::is_at_safepoint() && | |
|
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840 (Thread::current()->is_VM_thread() || UseG1GC)), |
| 0 | 841 "not locked"); |
| 842 HeapWord* obj = top(); | |
| 843 if (pointer_delta(end_value, obj) >= size) { | |
| 844 HeapWord* new_top = obj + size; | |
| 845 set_top(new_top); | |
| 846 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 847 return obj; | |
| 848 } else { | |
| 849 return NULL; | |
| 850 } | |
| 851 } | |
| 852 | |
| 853 // This version is lock-free. | |
| 854 inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size, | |
| 855 HeapWord* const end_value) { | |
| 856 do { | |
| 857 HeapWord* obj = top(); | |
| 858 if (pointer_delta(end_value, obj) >= size) { | |
| 859 HeapWord* new_top = obj + size; | |
| 860 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
| 861 // result can be one of two: | |
| 862 // the old top value: the exchange succeeded | |
| 863 // otherwise: the new value of the top is returned. | |
| 864 if (result == obj) { | |
| 865 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 866 return obj; | |
| 867 } | |
| 868 } else { | |
| 869 return NULL; | |
| 870 } | |
| 871 } while (true); | |
| 872 } | |
| 873 | |
| 874 // Requires locking. | |
| 875 HeapWord* ContiguousSpace::allocate(size_t size) { | |
| 876 return allocate_impl(size, end()); | |
| 877 } | |
| 878 | |
| 879 // Lock-free. | |
| 880 HeapWord* ContiguousSpace::par_allocate(size_t size) { | |
| 881 return par_allocate_impl(size, end()); | |
| 882 } | |
| 883 | |
| 884 void ContiguousSpace::allocate_temporary_filler(int factor) { | |
| 885 // allocate temporary type array decreasing free size with factor 'factor' | |
| 886 assert(factor >= 0, "just checking"); | |
| 887 size_t size = pointer_delta(end(), top()); | |
| 888 | |
| 889 // if space is full, return | |
| 890 if (size == 0) return; | |
| 891 | |
| 892 if (factor > 0) { | |
| 893 size -= size/factor; | |
| 894 } | |
| 895 size = align_object_size(size); | |
| 896 | |
|
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897 const size_t array_header_size = typeArrayOopDesc::header_size(T_INT); |
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898 if (size >= (size_t)align_object_size(array_header_size)) { |
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899 size_t length = (size - array_header_size) * (HeapWordSize / sizeof(jint)); |
| 0 | 900 // allocate uninitialized int array |
| 901 typeArrayOop t = (typeArrayOop) allocate(size); | |
| 902 assert(t != NULL, "allocation should succeed"); | |
| 903 t->set_mark(markOopDesc::prototype()); | |
| 904 t->set_klass(Universe::intArrayKlassObj()); | |
| 905 t->set_length((int)length); | |
| 906 } else { | |
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907 assert(size == CollectedHeap::min_fill_size(), |
| 0 | 908 "size for smallest fake object doesn't match"); |
| 909 instanceOop obj = (instanceOop) allocate(size); | |
| 910 obj->set_mark(markOopDesc::prototype()); | |
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911 obj->set_klass_gap(0); |
| 1142 | 912 obj->set_klass(SystemDictionary::Object_klass()); |
| 0 | 913 } |
| 914 } | |
| 915 | |
|
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916 void EdenSpace::clear(bool mangle_space) { |
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917 ContiguousSpace::clear(mangle_space); |
| 0 | 918 set_soft_end(end()); |
| 919 } | |
| 920 | |
| 921 // Requires locking. | |
| 922 HeapWord* EdenSpace::allocate(size_t size) { | |
| 923 return allocate_impl(size, soft_end()); | |
| 924 } | |
| 925 | |
| 926 // Lock-free. | |
| 927 HeapWord* EdenSpace::par_allocate(size_t size) { | |
| 928 return par_allocate_impl(size, soft_end()); | |
| 929 } | |
| 930 | |
| 931 HeapWord* ConcEdenSpace::par_allocate(size_t size) | |
| 932 { | |
| 933 do { | |
| 934 // The invariant is top() should be read before end() because | |
| 935 // top() can't be greater than end(), so if an update of _soft_end | |
| 936 // occurs between 'end_val = end();' and 'top_val = top();' top() | |
| 937 // also can grow up to the new end() and the condition | |
| 938 // 'top_val > end_val' is true. To ensure the loading order | |
| 939 // OrderAccess::loadload() is required after top() read. | |
| 940 HeapWord* obj = top(); | |
| 941 OrderAccess::loadload(); | |
| 942 if (pointer_delta(*soft_end_addr(), obj) >= size) { | |
| 943 HeapWord* new_top = obj + size; | |
| 944 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
| 945 // result can be one of two: | |
| 946 // the old top value: the exchange succeeded | |
| 947 // otherwise: the new value of the top is returned. | |
| 948 if (result == obj) { | |
| 949 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 950 return obj; | |
| 951 } | |
| 952 } else { | |
| 953 return NULL; | |
| 954 } | |
| 955 } while (true); | |
| 956 } | |
| 957 | |
| 958 | |
| 959 HeapWord* OffsetTableContigSpace::initialize_threshold() { | |
| 960 return _offsets.initialize_threshold(); | |
| 961 } | |
| 962 | |
| 963 HeapWord* OffsetTableContigSpace::cross_threshold(HeapWord* start, HeapWord* end) { | |
| 964 _offsets.alloc_block(start, end); | |
| 965 return _offsets.threshold(); | |
| 966 } | |
| 967 | |
| 968 OffsetTableContigSpace::OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
| 969 MemRegion mr) : | |
| 970 _offsets(sharedOffsetArray, mr), | |
| 971 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true) | |
| 972 { | |
| 973 _offsets.set_contig_space(this); | |
|
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974 initialize(mr, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
| 0 | 975 } |
| 976 | |
| 977 #define OBJ_SAMPLE_INTERVAL 0 | |
| 978 #define BLOCK_SAMPLE_INTERVAL 100 | |
| 979 | |
| 6008 | 980 void OffsetTableContigSpace::verify() const { |
| 0 | 981 HeapWord* p = bottom(); |
| 982 HeapWord* prev_p = NULL; | |
| 983 int objs = 0; | |
| 984 int blocks = 0; | |
| 985 | |
| 986 if (VerifyObjectStartArray) { | |
| 987 _offsets.verify(); | |
| 988 } | |
| 989 | |
| 990 while (p < top()) { | |
| 991 size_t size = oop(p)->size(); | |
| 992 // For a sampling of objects in the space, find it using the | |
| 993 // block offset table. | |
| 994 if (blocks == BLOCK_SAMPLE_INTERVAL) { | |
|
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995 guarantee(p == block_start_const(p + (size/2)), |
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|
996 "check offset computation"); |
| 0 | 997 blocks = 0; |
| 998 } else { | |
| 999 blocks++; | |
| 1000 } | |
| 1001 | |
| 1002 if (objs == OBJ_SAMPLE_INTERVAL) { | |
| 1003 oop(p)->verify(); | |
| 1004 objs = 0; | |
| 1005 } else { | |
| 1006 objs++; | |
| 1007 } | |
| 1008 prev_p = p; | |
| 1009 p += size; | |
| 1010 } | |
| 1011 guarantee(p == top(), "end of last object must match end of space"); | |
| 1012 } | |
| 1013 | |
| 1014 | |
| 438 | 1015 size_t TenuredSpace::allowed_dead_ratio() const { |
| 0 | 1016 return MarkSweepDeadRatio; |
| 1017 } |