Mercurial > hg > truffle
annotate src/share/vm/memory/space.cpp @ 481:7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
Reviewed-by: apetrusenko, ysr
| author | jcoomes |
|---|---|
| date | Thu, 11 Dec 2008 12:05:08 -0800 |
| parents | 122d10c82f3f |
| children | e9be0e04635a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_space.cpp.incl" | |
| 27 | |
|
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28 void SpaceMemRegionOopsIterClosure::do_oop(oop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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29 void SpaceMemRegionOopsIterClosure::do_oop(narrowOop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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30 |
| 0 | 31 HeapWord* DirtyCardToOopClosure::get_actual_top(HeapWord* top, |
| 32 HeapWord* top_obj) { | |
| 33 if (top_obj != NULL) { | |
| 34 if (_sp->block_is_obj(top_obj)) { | |
| 35 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
| 36 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
| 37 // An arrayOop is starting on the dirty card - since we do exact | |
| 38 // store checks for objArrays we are done. | |
| 39 } else { | |
| 40 // Otherwise, it is possible that the object starting on the dirty | |
| 41 // card spans the entire card, and that the store happened on a | |
| 42 // later card. Figure out where the object ends. | |
| 43 // Use the block_size() method of the space over which | |
| 44 // the iteration is being done. That space (e.g. CMS) may have | |
| 45 // specific requirements on object sizes which will | |
| 46 // be reflected in the block_size() method. | |
| 47 top = top_obj + oop(top_obj)->size(); | |
| 48 } | |
| 49 } | |
| 50 } else { | |
| 51 top = top_obj; | |
| 52 } | |
| 53 } else { | |
| 54 assert(top == _sp->end(), "only case where top_obj == NULL"); | |
| 55 } | |
| 56 return top; | |
| 57 } | |
| 58 | |
| 59 void DirtyCardToOopClosure::walk_mem_region(MemRegion mr, | |
| 60 HeapWord* bottom, | |
| 61 HeapWord* top) { | |
| 62 // 1. Blocks may or may not be objects. | |
| 63 // 2. Even when a block_is_obj(), it may not entirely | |
| 64 // occupy the block if the block quantum is larger than | |
| 65 // the object size. | |
| 66 // We can and should try to optimize by calling the non-MemRegion | |
| 67 // version of oop_iterate() for all but the extremal objects | |
| 68 // (for which we need to call the MemRegion version of | |
| 69 // oop_iterate()) To be done post-beta XXX | |
| 70 for (; bottom < top; bottom += _sp->block_size(bottom)) { | |
| 71 // As in the case of contiguous space above, we'd like to | |
| 72 // just use the value returned by oop_iterate to increment the | |
| 73 // current pointer; unfortunately, that won't work in CMS because | |
| 74 // we'd need an interface change (it seems) to have the space | |
| 75 // "adjust the object size" (for instance pad it up to its | |
| 76 // block alignment or minimum block size restrictions. XXX | |
| 77 if (_sp->block_is_obj(bottom) && | |
| 78 !_sp->obj_allocated_since_save_marks(oop(bottom))) { | |
| 79 oop(bottom)->oop_iterate(_cl, mr); | |
| 80 } | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 void DirtyCardToOopClosure::do_MemRegion(MemRegion mr) { | |
| 85 | |
| 86 // Some collectors need to do special things whenever their dirty | |
| 87 // cards are processed. For instance, CMS must remember mutator updates | |
| 88 // (i.e. dirty cards) so as to re-scan mutated objects. | |
| 89 // Such work can be piggy-backed here on dirty card scanning, so as to make | |
| 90 // it slightly more efficient than doing a complete non-detructive pre-scan | |
| 91 // of the card table. | |
| 92 MemRegionClosure* pCl = _sp->preconsumptionDirtyCardClosure(); | |
| 93 if (pCl != NULL) { | |
| 94 pCl->do_MemRegion(mr); | |
| 95 } | |
| 96 | |
| 97 HeapWord* bottom = mr.start(); | |
| 98 HeapWord* last = mr.last(); | |
| 99 HeapWord* top = mr.end(); | |
| 100 HeapWord* bottom_obj; | |
| 101 HeapWord* top_obj; | |
| 102 | |
| 103 assert(_precision == CardTableModRefBS::ObjHeadPreciseArray || | |
| 104 _precision == CardTableModRefBS::Precise, | |
| 105 "Only ones we deal with for now."); | |
| 106 | |
| 107 assert(_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
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108 _cl->idempotent() || _last_bottom == NULL || |
| 0 | 109 top <= _last_bottom, |
| 110 "Not decreasing"); | |
| 111 NOT_PRODUCT(_last_bottom = mr.start()); | |
| 112 | |
| 113 bottom_obj = _sp->block_start(bottom); | |
| 114 top_obj = _sp->block_start(last); | |
| 115 | |
| 116 assert(bottom_obj <= bottom, "just checking"); | |
| 117 assert(top_obj <= top, "just checking"); | |
| 118 | |
| 119 // Given what we think is the top of the memory region and | |
| 120 // the start of the object at the top, get the actual | |
| 121 // value of the top. | |
| 122 top = get_actual_top(top, top_obj); | |
| 123 | |
| 124 // If the previous call did some part of this region, don't redo. | |
| 125 if (_precision == CardTableModRefBS::ObjHeadPreciseArray && | |
| 126 _min_done != NULL && | |
| 127 _min_done < top) { | |
| 128 top = _min_done; | |
| 129 } | |
| 130 | |
| 131 // Top may have been reset, and in fact may be below bottom, | |
| 132 // e.g. the dirty card region is entirely in a now free object | |
| 133 // -- something that could happen with a concurrent sweeper. | |
| 134 bottom = MIN2(bottom, top); | |
| 135 mr = MemRegion(bottom, top); | |
| 136 assert(bottom <= top && | |
| 137 (_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
| 138 _min_done == NULL || | |
| 139 top <= _min_done), | |
| 140 "overlap!"); | |
| 141 | |
| 142 // Walk the region if it is not empty; otherwise there is nothing to do. | |
| 143 if (!mr.is_empty()) { | |
| 144 walk_mem_region(mr, bottom_obj, top); | |
| 145 } | |
| 146 | |
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147 // An idempotent closure might be applied in any order, so we don't |
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148 // record a _min_done for it. |
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149 if (!_cl->idempotent()) { |
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150 _min_done = bottom; |
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151 } else { |
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152 assert(_min_done == _last_explicit_min_done, |
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153 "Don't update _min_done for idempotent cl"); |
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154 } |
| 0 | 155 } |
| 156 | |
| 157 DirtyCardToOopClosure* Space::new_dcto_cl(OopClosure* cl, | |
| 158 CardTableModRefBS::PrecisionStyle precision, | |
| 159 HeapWord* boundary) { | |
| 160 return new DirtyCardToOopClosure(this, cl, precision, boundary); | |
| 161 } | |
| 162 | |
| 163 HeapWord* ContiguousSpaceDCTOC::get_actual_top(HeapWord* top, | |
| 164 HeapWord* top_obj) { | |
| 165 if (top_obj != NULL && top_obj < (_sp->toContiguousSpace())->top()) { | |
| 166 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
| 167 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
| 168 // An arrayOop is starting on the dirty card - since we do exact | |
| 169 // store checks for objArrays we are done. | |
| 170 } else { | |
| 171 // Otherwise, it is possible that the object starting on the dirty | |
| 172 // card spans the entire card, and that the store happened on a | |
| 173 // later card. Figure out where the object ends. | |
| 174 assert(_sp->block_size(top_obj) == (size_t) oop(top_obj)->size(), | |
| 175 "Block size and object size mismatch"); | |
| 176 top = top_obj + oop(top_obj)->size(); | |
| 177 } | |
| 178 } | |
| 179 } else { | |
| 180 top = (_sp->toContiguousSpace())->top(); | |
| 181 } | |
| 182 return top; | |
| 183 } | |
| 184 | |
| 185 void Filtering_DCTOC::walk_mem_region(MemRegion mr, | |
| 186 HeapWord* bottom, | |
| 187 HeapWord* top) { | |
| 188 // Note that this assumption won't hold if we have a concurrent | |
| 189 // collector in this space, which may have freed up objects after | |
| 190 // they were dirtied and before the stop-the-world GC that is | |
| 191 // examining cards here. | |
| 192 assert(bottom < top, "ought to be at least one obj on a dirty card."); | |
| 193 | |
| 194 if (_boundary != NULL) { | |
| 195 // We have a boundary outside of which we don't want to look | |
| 196 // at objects, so create a filtering closure around the | |
| 197 // oop closure before walking the region. | |
| 198 FilteringClosure filter(_boundary, _cl); | |
| 199 walk_mem_region_with_cl(mr, bottom, top, &filter); | |
| 200 } else { | |
| 201 // No boundary, simply walk the heap with the oop closure. | |
| 202 walk_mem_region_with_cl(mr, bottom, top, _cl); | |
| 203 } | |
| 204 | |
| 205 } | |
| 206 | |
| 207 // We must replicate this so that the static type of "FilteringClosure" | |
| 208 // (see above) is apparent at the oop_iterate calls. | |
| 209 #define ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(ClosureType) \ | |
| 210 void ContiguousSpaceDCTOC::walk_mem_region_with_cl(MemRegion mr, \ | |
| 211 HeapWord* bottom, \ | |
| 212 HeapWord* top, \ | |
| 213 ClosureType* cl) { \ | |
| 214 bottom += oop(bottom)->oop_iterate(cl, mr); \ | |
| 215 if (bottom < top) { \ | |
| 216 HeapWord* next_obj = bottom + oop(bottom)->size(); \ | |
| 217 while (next_obj < top) { \ | |
| 218 /* Bottom lies entirely below top, so we can call the */ \ | |
| 219 /* non-memRegion version of oop_iterate below. */ \ | |
| 220 oop(bottom)->oop_iterate(cl); \ | |
| 221 bottom = next_obj; \ | |
| 222 next_obj = bottom + oop(bottom)->size(); \ | |
| 223 } \ | |
| 224 /* Last object. */ \ | |
| 225 oop(bottom)->oop_iterate(cl, mr); \ | |
| 226 } \ | |
| 227 } | |
| 228 | |
| 229 // (There are only two of these, rather than N, because the split is due | |
| 230 // only to the introduction of the FilteringClosure, a local part of the | |
| 231 // impl of this abstraction.) | |
| 232 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(OopClosure) | |
| 233 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(FilteringClosure) | |
| 234 | |
| 235 DirtyCardToOopClosure* | |
| 236 ContiguousSpace::new_dcto_cl(OopClosure* cl, | |
| 237 CardTableModRefBS::PrecisionStyle precision, | |
| 238 HeapWord* boundary) { | |
| 239 return new ContiguousSpaceDCTOC(this, cl, precision, boundary); | |
| 240 } | |
| 241 | |
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242 void Space::initialize(MemRegion mr, |
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243 bool clear_space, |
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244 bool mangle_space) { |
| 0 | 245 HeapWord* bottom = mr.start(); |
| 246 HeapWord* end = mr.end(); | |
| 247 assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end), | |
| 248 "invalid space boundaries"); | |
| 249 set_bottom(bottom); | |
| 250 set_end(end); | |
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251 if (clear_space) clear(mangle_space); |
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252 } |
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253 |
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254 void Space::clear(bool mangle_space) { |
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255 if (ZapUnusedHeapArea && mangle_space) { |
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256 mangle_unused_area(); |
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257 } |
| 0 | 258 } |
| 259 | |
| 356 | 260 ContiguousSpace::ContiguousSpace(): CompactibleSpace(), _top(NULL), |
| 261 _concurrent_iteration_safe_limit(NULL) { | |
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262 _mangler = new GenSpaceMangler(this); |
| 0 | 263 } |
| 264 | |
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265 ContiguousSpace::~ContiguousSpace() { |
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266 delete _mangler; |
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267 } |
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268 |
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269 void ContiguousSpace::initialize(MemRegion mr, |
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270 bool clear_space, |
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271 bool mangle_space) |
| 0 | 272 { |
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273 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
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274 set_concurrent_iteration_safe_limit(top()); |
| 0 | 275 } |
| 276 | |
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277 void ContiguousSpace::clear(bool mangle_space) { |
| 0 | 278 set_top(bottom()); |
| 279 set_saved_mark(); | |
| 356 | 280 CompactibleSpace::clear(mangle_space); |
| 0 | 281 } |
| 282 | |
| 283 bool Space::is_in(const void* p) const { | |
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284 HeapWord* b = block_start_const(p); |
| 0 | 285 return b != NULL && block_is_obj(b); |
| 286 } | |
| 287 | |
| 288 bool ContiguousSpace::is_in(const void* p) const { | |
| 289 return _bottom <= p && p < _top; | |
| 290 } | |
| 291 | |
| 292 bool ContiguousSpace::is_free_block(const HeapWord* p) const { | |
| 293 return p >= _top; | |
| 294 } | |
| 295 | |
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296 void OffsetTableContigSpace::clear(bool mangle_space) { |
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297 ContiguousSpace::clear(mangle_space); |
| 0 | 298 _offsets.initialize_threshold(); |
| 299 } | |
| 300 | |
| 301 void OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 302 Space::set_bottom(new_bottom); | |
| 303 _offsets.set_bottom(new_bottom); | |
| 304 } | |
| 305 | |
| 306 void OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 307 // Space should not advertize an increase in size | |
| 308 // until after the underlying offest table has been enlarged. | |
| 309 _offsets.resize(pointer_delta(new_end, bottom())); | |
| 310 Space::set_end(new_end); | |
| 311 } | |
| 312 | |
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313 #ifndef PRODUCT |
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314 |
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315 void ContiguousSpace::set_top_for_allocations(HeapWord* v) { |
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316 mangler()->set_top_for_allocations(v); |
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317 } |
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318 void ContiguousSpace::set_top_for_allocations() { |
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319 mangler()->set_top_for_allocations(top()); |
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320 } |
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321 void ContiguousSpace::check_mangled_unused_area(HeapWord* limit) { |
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322 mangler()->check_mangled_unused_area(limit); |
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323 } |
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324 |
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325 void ContiguousSpace::check_mangled_unused_area_complete() { |
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326 mangler()->check_mangled_unused_area_complete(); |
| 0 | 327 } |
| 328 | |
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329 // Mangled only the unused space that has not previously |
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330 // been mangled and that has not been allocated since being |
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331 // mangled. |
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332 void ContiguousSpace::mangle_unused_area() { |
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333 mangler()->mangle_unused_area(); |
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334 } |
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335 void ContiguousSpace::mangle_unused_area_complete() { |
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336 mangler()->mangle_unused_area_complete(); |
| 0 | 337 } |
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338 void ContiguousSpace::mangle_region(MemRegion mr) { |
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339 // Although this method uses SpaceMangler::mangle_region() which |
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340 // is not specific to a space, the when the ContiguousSpace version |
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341 // is called, it is always with regard to a space and this |
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342 // bounds checking is appropriate. |
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343 MemRegion space_mr(bottom(), end()); |
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344 assert(space_mr.contains(mr), "Mangling outside space"); |
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345 SpaceMangler::mangle_region(mr); |
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346 } |
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347 #endif // NOT_PRODUCT |
| 0 | 348 |
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349 void CompactibleSpace::initialize(MemRegion mr, |
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350 bool clear_space, |
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351 bool mangle_space) { |
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352 Space::initialize(mr, clear_space, mangle_space); |
| 356 | 353 set_compaction_top(bottom()); |
| 354 _next_compaction_space = NULL; | |
| 355 } | |
| 356 | |
| 357 void CompactibleSpace::clear(bool mangle_space) { | |
| 358 Space::clear(mangle_space); | |
| 0 | 359 _compaction_top = bottom(); |
| 360 } | |
| 361 | |
| 362 HeapWord* CompactibleSpace::forward(oop q, size_t size, | |
| 363 CompactPoint* cp, HeapWord* compact_top) { | |
| 364 // q is alive | |
| 365 // First check if we should switch compaction space | |
| 366 assert(this == cp->space, "'this' should be current compaction space."); | |
| 367 size_t compaction_max_size = pointer_delta(end(), compact_top); | |
| 368 while (size > compaction_max_size) { | |
| 369 // switch to next compaction space | |
| 370 cp->space->set_compaction_top(compact_top); | |
| 371 cp->space = cp->space->next_compaction_space(); | |
| 372 if (cp->space == NULL) { | |
| 373 cp->gen = GenCollectedHeap::heap()->prev_gen(cp->gen); | |
| 374 assert(cp->gen != NULL, "compaction must succeed"); | |
| 375 cp->space = cp->gen->first_compaction_space(); | |
| 376 assert(cp->space != NULL, "generation must have a first compaction space"); | |
| 377 } | |
| 378 compact_top = cp->space->bottom(); | |
| 379 cp->space->set_compaction_top(compact_top); | |
| 380 cp->threshold = cp->space->initialize_threshold(); | |
| 381 compaction_max_size = pointer_delta(cp->space->end(), compact_top); | |
| 382 } | |
| 383 | |
| 384 // store the forwarding pointer into the mark word | |
| 385 if ((HeapWord*)q != compact_top) { | |
| 386 q->forward_to(oop(compact_top)); | |
| 387 assert(q->is_gc_marked(), "encoding the pointer should preserve the mark"); | |
| 388 } else { | |
| 389 // if the object isn't moving we can just set the mark to the default | |
| 390 // mark and handle it specially later on. | |
| 391 q->init_mark(); | |
| 392 assert(q->forwardee() == NULL, "should be forwarded to NULL"); | |
| 393 } | |
| 394 | |
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395 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::register_live_oop(q, size)); |
| 0 | 396 compact_top += size; |
| 397 | |
| 398 // we need to update the offset table so that the beginnings of objects can be | |
| 399 // found during scavenge. Note that we are updating the offset table based on | |
| 400 // where the object will be once the compaction phase finishes. | |
| 401 if (compact_top > cp->threshold) | |
| 402 cp->threshold = | |
| 403 cp->space->cross_threshold(compact_top - size, compact_top); | |
| 404 return compact_top; | |
| 405 } | |
| 406 | |
| 407 | |
| 408 bool CompactibleSpace::insert_deadspace(size_t& allowed_deadspace_words, | |
| 409 HeapWord* q, size_t deadlength) { | |
| 410 if (allowed_deadspace_words >= deadlength) { | |
| 411 allowed_deadspace_words -= deadlength; | |
|
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412 CollectedHeap::fill_with_object(q, deadlength); |
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413 oop(q)->set_mark(oop(q)->mark()->set_marked()); |
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414 assert((int) deadlength == oop(q)->size(), "bad filler object size"); |
| 0 | 415 // Recall that we required "q == compaction_top". |
| 416 return true; | |
| 417 } else { | |
| 418 allowed_deadspace_words = 0; | |
| 419 return false; | |
| 420 } | |
| 421 } | |
| 422 | |
| 423 #define block_is_always_obj(q) true | |
| 424 #define obj_size(q) oop(q)->size() | |
| 425 #define adjust_obj_size(s) s | |
| 426 | |
| 427 void CompactibleSpace::prepare_for_compaction(CompactPoint* cp) { | |
| 428 SCAN_AND_FORWARD(cp, end, block_is_obj, block_size); | |
| 429 } | |
| 430 | |
| 431 // Faster object search. | |
| 432 void ContiguousSpace::prepare_for_compaction(CompactPoint* cp) { | |
| 433 SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size); | |
| 434 } | |
| 435 | |
| 436 void Space::adjust_pointers() { | |
| 437 // adjust all the interior pointers to point at the new locations of objects | |
| 438 // Used by MarkSweep::mark_sweep_phase3() | |
| 439 | |
| 440 // First check to see if there is any work to be done. | |
| 441 if (used() == 0) { | |
| 442 return; // Nothing to do. | |
| 443 } | |
| 444 | |
| 445 // Otherwise... | |
| 446 HeapWord* q = bottom(); | |
| 447 HeapWord* t = end(); | |
| 448 | |
| 449 debug_only(HeapWord* prev_q = NULL); | |
| 450 while (q < t) { | |
| 451 if (oop(q)->is_gc_marked()) { | |
| 452 // q is alive | |
| 453 | |
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454 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q))); |
| 0 | 455 // point all the oops to the new location |
| 456 size_t size = oop(q)->adjust_pointers(); | |
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457 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers()); |
| 0 | 458 |
| 459 debug_only(prev_q = q); | |
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460 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size)); |
| 0 | 461 |
| 462 q += size; | |
| 463 } else { | |
| 464 // q is not a live object. But we're not in a compactible space, | |
| 465 // So we don't have live ranges. | |
| 466 debug_only(prev_q = q); | |
| 467 q += block_size(q); | |
| 468 assert(q > prev_q, "we should be moving forward through memory"); | |
| 469 } | |
| 470 } | |
| 471 assert(q == t, "just checking"); | |
| 472 } | |
| 473 | |
| 474 void CompactibleSpace::adjust_pointers() { | |
| 475 // Check first is there is any work to do. | |
| 476 if (used() == 0) { | |
| 477 return; // Nothing to do. | |
| 478 } | |
| 479 | |
| 480 SCAN_AND_ADJUST_POINTERS(adjust_obj_size); | |
| 481 } | |
| 482 | |
| 483 void CompactibleSpace::compact() { | |
| 484 SCAN_AND_COMPACT(obj_size); | |
| 485 } | |
| 486 | |
| 487 void Space::print_short() const { print_short_on(tty); } | |
| 488 | |
| 489 void Space::print_short_on(outputStream* st) const { | |
| 490 st->print(" space " SIZE_FORMAT "K, %3d%% used", capacity() / K, | |
| 491 (int) ((double) used() * 100 / capacity())); | |
| 492 } | |
| 493 | |
| 494 void Space::print() const { print_on(tty); } | |
| 495 | |
| 496 void Space::print_on(outputStream* st) const { | |
| 497 print_short_on(st); | |
| 498 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 499 bottom(), end()); | |
| 500 } | |
| 501 | |
| 502 void ContiguousSpace::print_on(outputStream* st) const { | |
| 503 print_short_on(st); | |
| 504 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 505 bottom(), top(), end()); | |
| 506 } | |
| 507 | |
| 508 void OffsetTableContigSpace::print_on(outputStream* st) const { | |
| 509 print_short_on(st); | |
| 510 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 511 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 512 bottom(), top(), _offsets.threshold(), end()); | |
| 513 } | |
| 514 | |
| 515 void ContiguousSpace::verify(bool allow_dirty) const { | |
| 516 HeapWord* p = bottom(); | |
| 517 HeapWord* t = top(); | |
| 518 HeapWord* prev_p = NULL; | |
| 519 while (p < t) { | |
| 520 oop(p)->verify(); | |
| 521 prev_p = p; | |
| 522 p += oop(p)->size(); | |
| 523 } | |
| 524 guarantee(p == top(), "end of last object must match end of space"); | |
| 525 if (top() != end()) { | |
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526 guarantee(top() == block_start_const(end()-1) && |
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527 top() == block_start_const(top()), |
| 0 | 528 "top should be start of unallocated block, if it exists"); |
| 529 } | |
| 530 } | |
| 531 | |
| 532 void Space::oop_iterate(OopClosure* blk) { | |
| 533 ObjectToOopClosure blk2(blk); | |
| 534 object_iterate(&blk2); | |
| 535 } | |
| 536 | |
| 537 HeapWord* Space::object_iterate_careful(ObjectClosureCareful* cl) { | |
| 538 guarantee(false, "NYI"); | |
| 539 return bottom(); | |
| 540 } | |
| 541 | |
| 542 HeapWord* Space::object_iterate_careful_m(MemRegion mr, | |
| 543 ObjectClosureCareful* cl) { | |
| 544 guarantee(false, "NYI"); | |
| 545 return bottom(); | |
| 546 } | |
| 547 | |
| 548 | |
| 549 void Space::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
| 550 assert(!mr.is_empty(), "Should be non-empty"); | |
| 551 // We use MemRegion(bottom(), end()) rather than used_region() below | |
| 552 // because the two are not necessarily equal for some kinds of | |
| 553 // spaces, in particular, certain kinds of free list spaces. | |
| 554 // We could use the more complicated but more precise: | |
| 555 // MemRegion(used_region().start(), round_to(used_region().end(), CardSize)) | |
| 556 // but the slight imprecision seems acceptable in the assertion check. | |
| 557 assert(MemRegion(bottom(), end()).contains(mr), | |
| 558 "Should be within used space"); | |
| 559 HeapWord* prev = cl->previous(); // max address from last time | |
| 560 if (prev >= mr.end()) { // nothing to do | |
| 561 return; | |
| 562 } | |
| 563 // This assert will not work when we go from cms space to perm | |
| 564 // space, and use same closure. Easy fix deferred for later. XXX YSR | |
| 565 // assert(prev == NULL || contains(prev), "Should be within space"); | |
| 566 | |
| 567 bool last_was_obj_array = false; | |
| 568 HeapWord *blk_start_addr, *region_start_addr; | |
| 569 if (prev > mr.start()) { | |
| 570 region_start_addr = prev; | |
| 571 blk_start_addr = prev; | |
| 572 assert(blk_start_addr == block_start(region_start_addr), "invariant"); | |
| 573 } else { | |
| 574 region_start_addr = mr.start(); | |
| 575 blk_start_addr = block_start(region_start_addr); | |
| 576 } | |
| 577 HeapWord* region_end_addr = mr.end(); | |
| 578 MemRegion derived_mr(region_start_addr, region_end_addr); | |
| 579 while (blk_start_addr < region_end_addr) { | |
| 580 const size_t size = block_size(blk_start_addr); | |
| 581 if (block_is_obj(blk_start_addr)) { | |
| 582 last_was_obj_array = cl->do_object_bm(oop(blk_start_addr), derived_mr); | |
| 583 } else { | |
| 584 last_was_obj_array = false; | |
| 585 } | |
| 586 blk_start_addr += size; | |
| 587 } | |
| 588 if (!last_was_obj_array) { | |
| 589 assert((bottom() <= blk_start_addr) && (blk_start_addr <= end()), | |
| 590 "Should be within (closed) used space"); | |
| 591 assert(blk_start_addr > prev, "Invariant"); | |
| 592 cl->set_previous(blk_start_addr); // min address for next time | |
| 593 } | |
| 594 } | |
| 595 | |
| 596 bool Space::obj_is_alive(const HeapWord* p) const { | |
| 597 assert (block_is_obj(p), "The address should point to an object"); | |
| 598 return true; | |
| 599 } | |
| 600 | |
| 601 void ContiguousSpace::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
| 602 assert(!mr.is_empty(), "Should be non-empty"); | |
| 603 assert(used_region().contains(mr), "Should be within used space"); | |
| 604 HeapWord* prev = cl->previous(); // max address from last time | |
| 605 if (prev >= mr.end()) { // nothing to do | |
| 606 return; | |
| 607 } | |
| 608 // See comment above (in more general method above) in case you | |
| 609 // happen to use this method. | |
| 610 assert(prev == NULL || is_in_reserved(prev), "Should be within space"); | |
| 611 | |
| 612 bool last_was_obj_array = false; | |
| 613 HeapWord *obj_start_addr, *region_start_addr; | |
| 614 if (prev > mr.start()) { | |
| 615 region_start_addr = prev; | |
| 616 obj_start_addr = prev; | |
| 617 assert(obj_start_addr == block_start(region_start_addr), "invariant"); | |
| 618 } else { | |
| 619 region_start_addr = mr.start(); | |
| 620 obj_start_addr = block_start(region_start_addr); | |
| 621 } | |
| 622 HeapWord* region_end_addr = mr.end(); | |
| 623 MemRegion derived_mr(region_start_addr, region_end_addr); | |
| 624 while (obj_start_addr < region_end_addr) { | |
| 625 oop obj = oop(obj_start_addr); | |
| 626 const size_t size = obj->size(); | |
| 627 last_was_obj_array = cl->do_object_bm(obj, derived_mr); | |
| 628 obj_start_addr += size; | |
| 629 } | |
| 630 if (!last_was_obj_array) { | |
| 631 assert((bottom() <= obj_start_addr) && (obj_start_addr <= end()), | |
| 632 "Should be within (closed) used space"); | |
| 633 assert(obj_start_addr > prev, "Invariant"); | |
| 634 cl->set_previous(obj_start_addr); // min address for next time | |
| 635 } | |
| 636 } | |
| 637 | |
| 638 #ifndef SERIALGC | |
| 639 #define ContigSpace_PAR_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 640 \ | |
| 641 void ContiguousSpace::par_oop_iterate(MemRegion mr, OopClosureType* blk) {\ | |
| 642 HeapWord* obj_addr = mr.start(); \ | |
| 643 HeapWord* t = mr.end(); \ | |
| 644 while (obj_addr < t) { \ | |
| 645 assert(oop(obj_addr)->is_oop(), "Should be an oop"); \ | |
| 646 obj_addr += oop(obj_addr)->oop_iterate(blk); \ | |
| 647 } \ | |
| 648 } | |
| 649 | |
| 650 ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DEFN) | |
| 651 | |
| 652 #undef ContigSpace_PAR_OOP_ITERATE_DEFN | |
| 653 #endif // SERIALGC | |
| 654 | |
| 655 void ContiguousSpace::oop_iterate(OopClosure* blk) { | |
| 656 if (is_empty()) return; | |
| 657 HeapWord* obj_addr = bottom(); | |
| 658 HeapWord* t = top(); | |
| 659 // Could call objects iterate, but this is easier. | |
| 660 while (obj_addr < t) { | |
| 661 obj_addr += oop(obj_addr)->oop_iterate(blk); | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 void ContiguousSpace::oop_iterate(MemRegion mr, OopClosure* blk) { | |
| 666 if (is_empty()) { | |
| 667 return; | |
| 668 } | |
| 669 MemRegion cur = MemRegion(bottom(), top()); | |
| 670 mr = mr.intersection(cur); | |
| 671 if (mr.is_empty()) { | |
| 672 return; | |
| 673 } | |
| 674 if (mr.equals(cur)) { | |
| 675 oop_iterate(blk); | |
| 676 return; | |
| 677 } | |
| 678 assert(mr.end() <= top(), "just took an intersection above"); | |
| 679 HeapWord* obj_addr = block_start(mr.start()); | |
| 680 HeapWord* t = mr.end(); | |
| 681 | |
| 682 // Handle first object specially. | |
| 683 oop obj = oop(obj_addr); | |
| 684 SpaceMemRegionOopsIterClosure smr_blk(blk, mr); | |
| 685 obj_addr += obj->oop_iterate(&smr_blk); | |
| 686 while (obj_addr < t) { | |
| 687 oop obj = oop(obj_addr); | |
| 688 assert(obj->is_oop(), "expected an oop"); | |
| 689 obj_addr += obj->size(); | |
| 690 // If "obj_addr" is not greater than top, then the | |
| 691 // entire object "obj" is within the region. | |
| 692 if (obj_addr <= t) { | |
| 693 obj->oop_iterate(blk); | |
| 694 } else { | |
| 695 // "obj" extends beyond end of region | |
| 696 obj->oop_iterate(&smr_blk); | |
| 697 break; | |
| 698 } | |
| 699 }; | |
| 700 } | |
| 701 | |
| 702 void ContiguousSpace::object_iterate(ObjectClosure* blk) { | |
| 703 if (is_empty()) return; | |
| 704 WaterMark bm = bottom_mark(); | |
| 705 object_iterate_from(bm, blk); | |
| 706 } | |
| 707 | |
| 708 void ContiguousSpace::object_iterate_from(WaterMark mark, ObjectClosure* blk) { | |
| 709 assert(mark.space() == this, "Mark does not match space"); | |
| 710 HeapWord* p = mark.point(); | |
| 711 while (p < top()) { | |
| 712 blk->do_object(oop(p)); | |
| 713 p += oop(p)->size(); | |
| 714 } | |
| 715 } | |
| 716 | |
| 717 HeapWord* | |
| 718 ContiguousSpace::object_iterate_careful(ObjectClosureCareful* blk) { | |
| 719 HeapWord * limit = concurrent_iteration_safe_limit(); | |
| 720 assert(limit <= top(), "sanity check"); | |
| 721 for (HeapWord* p = bottom(); p < limit;) { | |
| 722 size_t size = blk->do_object_careful(oop(p)); | |
| 723 if (size == 0) { | |
| 724 return p; // failed at p | |
| 725 } else { | |
| 726 p += size; | |
| 727 } | |
| 728 } | |
| 729 return NULL; // all done | |
| 730 } | |
| 731 | |
| 732 #define ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 733 \ | |
| 734 void ContiguousSpace:: \ | |
| 735 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
| 736 HeapWord* t; \ | |
| 737 HeapWord* p = saved_mark_word(); \ | |
| 738 assert(p != NULL, "expected saved mark"); \ | |
| 739 \ | |
| 740 const intx interval = PrefetchScanIntervalInBytes; \ | |
| 741 do { \ | |
| 742 t = top(); \ | |
| 743 while (p < t) { \ | |
| 744 Prefetch::write(p, interval); \ | |
| 745 debug_only(HeapWord* prev = p); \ | |
| 746 oop m = oop(p); \ | |
| 747 p += m->oop_iterate(blk); \ | |
| 748 } \ | |
| 749 } while (t < top()); \ | |
| 750 \ | |
| 751 set_saved_mark_word(p); \ | |
| 752 } | |
| 753 | |
| 754 ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 755 | |
| 756 #undef ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN | |
| 757 | |
| 758 // Very general, slow implementation. | |
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759 HeapWord* ContiguousSpace::block_start_const(const void* p) const { |
| 0 | 760 assert(MemRegion(bottom(), end()).contains(p), "p not in space"); |
| 761 if (p >= top()) { | |
| 762 return top(); | |
| 763 } else { | |
| 764 HeapWord* last = bottom(); | |
| 765 HeapWord* cur = last; | |
| 766 while (cur <= p) { | |
| 767 last = cur; | |
| 768 cur += oop(cur)->size(); | |
| 769 } | |
| 770 assert(oop(last)->is_oop(), "Should be an object start"); | |
| 771 return last; | |
| 772 } | |
| 773 } | |
| 774 | |
| 775 size_t ContiguousSpace::block_size(const HeapWord* p) const { | |
| 776 assert(MemRegion(bottom(), end()).contains(p), "p not in space"); | |
| 777 HeapWord* current_top = top(); | |
| 778 assert(p <= current_top, "p is not a block start"); | |
| 779 assert(p == current_top || oop(p)->is_oop(), "p is not a block start"); | |
| 780 if (p < current_top) | |
| 781 return oop(p)->size(); | |
| 782 else { | |
| 783 assert(p == current_top, "just checking"); | |
| 784 return pointer_delta(end(), (HeapWord*) p); | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 // This version requires locking. | |
| 789 inline HeapWord* ContiguousSpace::allocate_impl(size_t size, | |
| 790 HeapWord* const end_value) { | |
| 791 assert(Heap_lock->owned_by_self() || | |
| 792 (SafepointSynchronize::is_at_safepoint() && | |
| 793 Thread::current()->is_VM_thread()), | |
| 794 "not locked"); | |
| 795 HeapWord* obj = top(); | |
| 796 if (pointer_delta(end_value, obj) >= size) { | |
| 797 HeapWord* new_top = obj + size; | |
| 798 set_top(new_top); | |
| 799 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 800 return obj; | |
| 801 } else { | |
| 802 return NULL; | |
| 803 } | |
| 804 } | |
| 805 | |
| 806 // This version is lock-free. | |
| 807 inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size, | |
| 808 HeapWord* const end_value) { | |
| 809 do { | |
| 810 HeapWord* obj = top(); | |
| 811 if (pointer_delta(end_value, obj) >= size) { | |
| 812 HeapWord* new_top = obj + size; | |
| 813 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
| 814 // result can be one of two: | |
| 815 // the old top value: the exchange succeeded | |
| 816 // otherwise: the new value of the top is returned. | |
| 817 if (result == obj) { | |
| 818 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 819 return obj; | |
| 820 } | |
| 821 } else { | |
| 822 return NULL; | |
| 823 } | |
| 824 } while (true); | |
| 825 } | |
| 826 | |
| 827 // Requires locking. | |
| 828 HeapWord* ContiguousSpace::allocate(size_t size) { | |
| 829 return allocate_impl(size, end()); | |
| 830 } | |
| 831 | |
| 832 // Lock-free. | |
| 833 HeapWord* ContiguousSpace::par_allocate(size_t size) { | |
| 834 return par_allocate_impl(size, end()); | |
| 835 } | |
| 836 | |
| 837 void ContiguousSpace::allocate_temporary_filler(int factor) { | |
| 838 // allocate temporary type array decreasing free size with factor 'factor' | |
| 839 assert(factor >= 0, "just checking"); | |
| 840 size_t size = pointer_delta(end(), top()); | |
| 841 | |
| 842 // if space is full, return | |
| 843 if (size == 0) return; | |
| 844 | |
| 845 if (factor > 0) { | |
| 846 size -= size/factor; | |
| 847 } | |
| 848 size = align_object_size(size); | |
| 849 | |
| 850 const size_t min_int_array_size = typeArrayOopDesc::header_size(T_INT); | |
| 851 if (size >= min_int_array_size) { | |
| 852 size_t length = (size - min_int_array_size) * (HeapWordSize / sizeof(jint)); | |
| 853 // allocate uninitialized int array | |
| 854 typeArrayOop t = (typeArrayOop) allocate(size); | |
| 855 assert(t != NULL, "allocation should succeed"); | |
| 856 t->set_mark(markOopDesc::prototype()); | |
| 857 t->set_klass(Universe::intArrayKlassObj()); | |
| 858 t->set_length((int)length); | |
| 859 } else { | |
| 860 assert((int) size == instanceOopDesc::header_size(), | |
| 861 "size for smallest fake object doesn't match"); | |
| 862 instanceOop obj = (instanceOop) allocate(size); | |
| 863 obj->set_mark(markOopDesc::prototype()); | |
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864 obj->set_klass_gap(0); |
| 0 | 865 obj->set_klass(SystemDictionary::object_klass()); |
| 866 } | |
| 867 } | |
| 868 | |
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869 void EdenSpace::clear(bool mangle_space) { |
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870 ContiguousSpace::clear(mangle_space); |
| 0 | 871 set_soft_end(end()); |
| 872 } | |
| 873 | |
| 874 // Requires locking. | |
| 875 HeapWord* EdenSpace::allocate(size_t size) { | |
| 876 return allocate_impl(size, soft_end()); | |
| 877 } | |
| 878 | |
| 879 // Lock-free. | |
| 880 HeapWord* EdenSpace::par_allocate(size_t size) { | |
| 881 return par_allocate_impl(size, soft_end()); | |
| 882 } | |
| 883 | |
| 884 HeapWord* ConcEdenSpace::par_allocate(size_t size) | |
| 885 { | |
| 886 do { | |
| 887 // The invariant is top() should be read before end() because | |
| 888 // top() can't be greater than end(), so if an update of _soft_end | |
| 889 // occurs between 'end_val = end();' and 'top_val = top();' top() | |
| 890 // also can grow up to the new end() and the condition | |
| 891 // 'top_val > end_val' is true. To ensure the loading order | |
| 892 // OrderAccess::loadload() is required after top() read. | |
| 893 HeapWord* obj = top(); | |
| 894 OrderAccess::loadload(); | |
| 895 if (pointer_delta(*soft_end_addr(), obj) >= size) { | |
| 896 HeapWord* new_top = obj + size; | |
| 897 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
| 898 // result can be one of two: | |
| 899 // the old top value: the exchange succeeded | |
| 900 // otherwise: the new value of the top is returned. | |
| 901 if (result == obj) { | |
| 902 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
| 903 return obj; | |
| 904 } | |
| 905 } else { | |
| 906 return NULL; | |
| 907 } | |
| 908 } while (true); | |
| 909 } | |
| 910 | |
| 911 | |
| 912 HeapWord* OffsetTableContigSpace::initialize_threshold() { | |
| 913 return _offsets.initialize_threshold(); | |
| 914 } | |
| 915 | |
| 916 HeapWord* OffsetTableContigSpace::cross_threshold(HeapWord* start, HeapWord* end) { | |
| 917 _offsets.alloc_block(start, end); | |
| 918 return _offsets.threshold(); | |
| 919 } | |
| 920 | |
| 921 OffsetTableContigSpace::OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
| 922 MemRegion mr) : | |
| 923 _offsets(sharedOffsetArray, mr), | |
| 924 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true) | |
| 925 { | |
| 926 _offsets.set_contig_space(this); | |
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927 initialize(mr, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
| 0 | 928 } |
| 929 | |
| 930 | |
| 931 class VerifyOldOopClosure : public OopClosure { | |
| 932 public: | |
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933 oop _the_obj; |
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934 bool _allow_dirty; |
| 0 | 935 void do_oop(oop* p) { |
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936 _the_obj->verify_old_oop(p, _allow_dirty); |
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937 } |
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938 void do_oop(narrowOop* p) { |
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939 _the_obj->verify_old_oop(p, _allow_dirty); |
| 0 | 940 } |
| 941 }; | |
| 942 | |
| 943 #define OBJ_SAMPLE_INTERVAL 0 | |
| 944 #define BLOCK_SAMPLE_INTERVAL 100 | |
| 945 | |
| 946 void OffsetTableContigSpace::verify(bool allow_dirty) const { | |
| 947 HeapWord* p = bottom(); | |
| 948 HeapWord* prev_p = NULL; | |
| 949 VerifyOldOopClosure blk; // Does this do anything? | |
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950 blk._allow_dirty = allow_dirty; |
| 0 | 951 int objs = 0; |
| 952 int blocks = 0; | |
| 953 | |
| 954 if (VerifyObjectStartArray) { | |
| 955 _offsets.verify(); | |
| 956 } | |
| 957 | |
| 958 while (p < top()) { | |
| 959 size_t size = oop(p)->size(); | |
| 960 // For a sampling of objects in the space, find it using the | |
| 961 // block offset table. | |
| 962 if (blocks == BLOCK_SAMPLE_INTERVAL) { | |
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963 guarantee(p == block_start_const(p + (size/2)), |
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964 "check offset computation"); |
| 0 | 965 blocks = 0; |
| 966 } else { | |
| 967 blocks++; | |
| 968 } | |
| 969 | |
| 970 if (objs == OBJ_SAMPLE_INTERVAL) { | |
| 971 oop(p)->verify(); | |
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972 blk._the_obj = oop(p); |
| 0 | 973 oop(p)->oop_iterate(&blk); |
| 974 objs = 0; | |
| 975 } else { | |
| 976 objs++; | |
| 977 } | |
| 978 prev_p = p; | |
| 979 p += size; | |
| 980 } | |
| 981 guarantee(p == top(), "end of last object must match end of space"); | |
| 982 } | |
| 983 | |
| 984 void OffsetTableContigSpace::serialize_block_offset_array_offsets( | |
| 985 SerializeOopClosure* soc) { | |
| 986 _offsets.serialize(soc); | |
| 987 } | |
| 988 | |
| 989 | |
| 438 | 990 size_t TenuredSpace::allowed_dead_ratio() const { |
| 0 | 991 return MarkSweepDeadRatio; |
| 992 } | |
| 993 | |
| 994 | |
| 438 | 995 size_t ContigPermSpace::allowed_dead_ratio() const { |
| 0 | 996 return PermMarkSweepDeadRatio; |
| 997 } |