Mercurial > hg > truffle
annotate src/share/vm/memory/space.cpp @ 3229:4a6bda6cfe28
Fix for usages that are phi in rematerialization
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Thu, 21 Jul 2011 11:32:22 +0200 |
parents | abdfc822206f |
children | fc2b798ab316 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
1552
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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" | |
0 | 43 |
113
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44 void SpaceMemRegionOopsIterClosure::do_oop(oop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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45 void SpaceMemRegionOopsIterClosure::do_oop(narrowOop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); } |
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46 |
0 | 47 HeapWord* DirtyCardToOopClosure::get_actual_top(HeapWord* top, |
48 HeapWord* top_obj) { | |
49 if (top_obj != NULL) { | |
50 if (_sp->block_is_obj(top_obj)) { | |
51 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
52 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
53 // An arrayOop is starting on the dirty card - since we do exact | |
54 // store checks for objArrays we are done. | |
55 } else { | |
56 // Otherwise, it is possible that the object starting on the dirty | |
57 // card spans the entire card, and that the store happened on a | |
58 // later card. Figure out where the object ends. | |
59 // Use the block_size() method of the space over which | |
60 // the iteration is being done. That space (e.g. CMS) may have | |
61 // specific requirements on object sizes which will | |
62 // be reflected in the block_size() method. | |
63 top = top_obj + oop(top_obj)->size(); | |
64 } | |
65 } | |
66 } else { | |
67 top = top_obj; | |
68 } | |
69 } else { | |
70 assert(top == _sp->end(), "only case where top_obj == NULL"); | |
71 } | |
72 return top; | |
73 } | |
74 | |
75 void DirtyCardToOopClosure::walk_mem_region(MemRegion mr, | |
76 HeapWord* bottom, | |
77 HeapWord* top) { | |
78 // 1. Blocks may or may not be objects. | |
79 // 2. Even when a block_is_obj(), it may not entirely | |
80 // occupy the block if the block quantum is larger than | |
81 // the object size. | |
82 // We can and should try to optimize by calling the non-MemRegion | |
83 // version of oop_iterate() for all but the extremal objects | |
84 // (for which we need to call the MemRegion version of | |
85 // oop_iterate()) To be done post-beta XXX | |
86 for (; bottom < top; bottom += _sp->block_size(bottom)) { | |
87 // As in the case of contiguous space above, we'd like to | |
88 // just use the value returned by oop_iterate to increment the | |
89 // current pointer; unfortunately, that won't work in CMS because | |
90 // we'd need an interface change (it seems) to have the space | |
91 // "adjust the object size" (for instance pad it up to its | |
92 // block alignment or minimum block size restrictions. XXX | |
93 if (_sp->block_is_obj(bottom) && | |
94 !_sp->obj_allocated_since_save_marks(oop(bottom))) { | |
95 oop(bottom)->oop_iterate(_cl, mr); | |
96 } | |
97 } | |
98 } | |
99 | |
100 void DirtyCardToOopClosure::do_MemRegion(MemRegion mr) { | |
101 | |
102 // Some collectors need to do special things whenever their dirty | |
103 // cards are processed. For instance, CMS must remember mutator updates | |
104 // (i.e. dirty cards) so as to re-scan mutated objects. | |
105 // Such work can be piggy-backed here on dirty card scanning, so as to make | |
106 // it slightly more efficient than doing a complete non-detructive pre-scan | |
107 // of the card table. | |
108 MemRegionClosure* pCl = _sp->preconsumptionDirtyCardClosure(); | |
109 if (pCl != NULL) { | |
110 pCl->do_MemRegion(mr); | |
111 } | |
112 | |
113 HeapWord* bottom = mr.start(); | |
114 HeapWord* last = mr.last(); | |
115 HeapWord* top = mr.end(); | |
116 HeapWord* bottom_obj; | |
117 HeapWord* top_obj; | |
118 | |
119 assert(_precision == CardTableModRefBS::ObjHeadPreciseArray || | |
120 _precision == CardTableModRefBS::Precise, | |
121 "Only ones we deal with for now."); | |
122 | |
123 assert(_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
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124 _cl->idempotent() || _last_bottom == NULL || |
0 | 125 top <= _last_bottom, |
126 "Not decreasing"); | |
127 NOT_PRODUCT(_last_bottom = mr.start()); | |
128 | |
129 bottom_obj = _sp->block_start(bottom); | |
130 top_obj = _sp->block_start(last); | |
131 | |
132 assert(bottom_obj <= bottom, "just checking"); | |
133 assert(top_obj <= top, "just checking"); | |
134 | |
135 // Given what we think is the top of the memory region and | |
136 // the start of the object at the top, get the actual | |
137 // value of the top. | |
138 top = get_actual_top(top, top_obj); | |
139 | |
140 // If the previous call did some part of this region, don't redo. | |
141 if (_precision == CardTableModRefBS::ObjHeadPreciseArray && | |
142 _min_done != NULL && | |
143 _min_done < top) { | |
144 top = _min_done; | |
145 } | |
146 | |
147 // Top may have been reset, and in fact may be below bottom, | |
148 // e.g. the dirty card region is entirely in a now free object | |
149 // -- something that could happen with a concurrent sweeper. | |
150 bottom = MIN2(bottom, top); | |
151 mr = MemRegion(bottom, top); | |
152 assert(bottom <= top && | |
153 (_precision != CardTableModRefBS::ObjHeadPreciseArray || | |
154 _min_done == NULL || | |
155 top <= _min_done), | |
156 "overlap!"); | |
157 | |
158 // Walk the region if it is not empty; otherwise there is nothing to do. | |
159 if (!mr.is_empty()) { | |
160 walk_mem_region(mr, bottom_obj, top); | |
161 } | |
162 | |
342
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163 // An idempotent closure might be applied in any order, so we don't |
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164 // record a _min_done for it. |
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165 if (!_cl->idempotent()) { |
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166 _min_done = bottom; |
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167 } else { |
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168 assert(_min_done == _last_explicit_min_done, |
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169 "Don't update _min_done for idempotent cl"); |
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170 } |
0 | 171 } |
172 | |
173 DirtyCardToOopClosure* Space::new_dcto_cl(OopClosure* cl, | |
174 CardTableModRefBS::PrecisionStyle precision, | |
175 HeapWord* boundary) { | |
176 return new DirtyCardToOopClosure(this, cl, precision, boundary); | |
177 } | |
178 | |
179 HeapWord* ContiguousSpaceDCTOC::get_actual_top(HeapWord* top, | |
180 HeapWord* top_obj) { | |
181 if (top_obj != NULL && top_obj < (_sp->toContiguousSpace())->top()) { | |
182 if (_precision == CardTableModRefBS::ObjHeadPreciseArray) { | |
183 if (oop(top_obj)->is_objArray() || oop(top_obj)->is_typeArray()) { | |
184 // An arrayOop is starting on the dirty card - since we do exact | |
185 // store checks for objArrays we are done. | |
186 } else { | |
187 // Otherwise, it is possible that the object starting on the dirty | |
188 // card spans the entire card, and that the store happened on a | |
189 // later card. Figure out where the object ends. | |
190 assert(_sp->block_size(top_obj) == (size_t) oop(top_obj)->size(), | |
191 "Block size and object size mismatch"); | |
192 top = top_obj + oop(top_obj)->size(); | |
193 } | |
194 } | |
195 } else { | |
196 top = (_sp->toContiguousSpace())->top(); | |
197 } | |
198 return top; | |
199 } | |
200 | |
201 void Filtering_DCTOC::walk_mem_region(MemRegion mr, | |
202 HeapWord* bottom, | |
203 HeapWord* top) { | |
204 // Note that this assumption won't hold if we have a concurrent | |
205 // collector in this space, which may have freed up objects after | |
206 // they were dirtied and before the stop-the-world GC that is | |
207 // examining cards here. | |
208 assert(bottom < top, "ought to be at least one obj on a dirty card."); | |
209 | |
210 if (_boundary != NULL) { | |
211 // We have a boundary outside of which we don't want to look | |
212 // at objects, so create a filtering closure around the | |
213 // oop closure before walking the region. | |
214 FilteringClosure filter(_boundary, _cl); | |
215 walk_mem_region_with_cl(mr, bottom, top, &filter); | |
216 } else { | |
217 // No boundary, simply walk the heap with the oop closure. | |
218 walk_mem_region_with_cl(mr, bottom, top, _cl); | |
219 } | |
220 | |
221 } | |
222 | |
223 // We must replicate this so that the static type of "FilteringClosure" | |
224 // (see above) is apparent at the oop_iterate calls. | |
225 #define ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(ClosureType) \ | |
226 void ContiguousSpaceDCTOC::walk_mem_region_with_cl(MemRegion mr, \ | |
227 HeapWord* bottom, \ | |
228 HeapWord* top, \ | |
229 ClosureType* cl) { \ | |
230 bottom += oop(bottom)->oop_iterate(cl, mr); \ | |
231 if (bottom < top) { \ | |
232 HeapWord* next_obj = bottom + oop(bottom)->size(); \ | |
233 while (next_obj < top) { \ | |
234 /* Bottom lies entirely below top, so we can call the */ \ | |
235 /* non-memRegion version of oop_iterate below. */ \ | |
236 oop(bottom)->oop_iterate(cl); \ | |
237 bottom = next_obj; \ | |
238 next_obj = bottom + oop(bottom)->size(); \ | |
239 } \ | |
240 /* Last object. */ \ | |
241 oop(bottom)->oop_iterate(cl, mr); \ | |
242 } \ | |
243 } | |
244 | |
245 // (There are only two of these, rather than N, because the split is due | |
246 // only to the introduction of the FilteringClosure, a local part of the | |
247 // impl of this abstraction.) | |
248 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(OopClosure) | |
249 ContiguousSpaceDCTOC__walk_mem_region_with_cl_DEFN(FilteringClosure) | |
250 | |
251 DirtyCardToOopClosure* | |
252 ContiguousSpace::new_dcto_cl(OopClosure* cl, | |
253 CardTableModRefBS::PrecisionStyle precision, | |
254 HeapWord* boundary) { | |
255 return new ContiguousSpaceDCTOC(this, cl, precision, boundary); | |
256 } | |
257 | |
263
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258 void Space::initialize(MemRegion mr, |
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259 bool clear_space, |
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260 bool mangle_space) { |
0 | 261 HeapWord* bottom = mr.start(); |
262 HeapWord* end = mr.end(); | |
263 assert(Universe::on_page_boundary(bottom) && Universe::on_page_boundary(end), | |
264 "invalid space boundaries"); | |
265 set_bottom(bottom); | |
266 set_end(end); | |
263
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267 if (clear_space) clear(mangle_space); |
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268 } |
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269 |
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270 void Space::clear(bool mangle_space) { |
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271 if (ZapUnusedHeapArea && mangle_space) { |
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272 mangle_unused_area(); |
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273 } |
0 | 274 } |
275 | |
356 | 276 ContiguousSpace::ContiguousSpace(): CompactibleSpace(), _top(NULL), |
277 _concurrent_iteration_safe_limit(NULL) { | |
263
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278 _mangler = new GenSpaceMangler(this); |
0 | 279 } |
280 | |
263
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281 ContiguousSpace::~ContiguousSpace() { |
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282 delete _mangler; |
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283 } |
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284 |
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285 void ContiguousSpace::initialize(MemRegion mr, |
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286 bool clear_space, |
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287 bool mangle_space) |
0 | 288 { |
263
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289 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
347
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290 set_concurrent_iteration_safe_limit(top()); |
0 | 291 } |
292 | |
263
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293 void ContiguousSpace::clear(bool mangle_space) { |
0 | 294 set_top(bottom()); |
295 set_saved_mark(); | |
356 | 296 CompactibleSpace::clear(mangle_space); |
0 | 297 } |
298 | |
299 bool Space::is_in(const void* p) const { | |
342
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300 HeapWord* b = block_start_const(p); |
0 | 301 return b != NULL && block_is_obj(b); |
302 } | |
303 | |
304 bool ContiguousSpace::is_in(const void* p) const { | |
305 return _bottom <= p && p < _top; | |
306 } | |
307 | |
308 bool ContiguousSpace::is_free_block(const HeapWord* p) const { | |
309 return p >= _top; | |
310 } | |
311 | |
263
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312 void OffsetTableContigSpace::clear(bool mangle_space) { |
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313 ContiguousSpace::clear(mangle_space); |
0 | 314 _offsets.initialize_threshold(); |
315 } | |
316 | |
317 void OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
318 Space::set_bottom(new_bottom); | |
319 _offsets.set_bottom(new_bottom); | |
320 } | |
321 | |
322 void OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
323 // Space should not advertize an increase in size | |
324 // until after the underlying offest table has been enlarged. | |
325 _offsets.resize(pointer_delta(new_end, bottom())); | |
326 Space::set_end(new_end); | |
327 } | |
328 | |
263
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329 #ifndef PRODUCT |
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330 |
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331 void ContiguousSpace::set_top_for_allocations(HeapWord* v) { |
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332 mangler()->set_top_for_allocations(v); |
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333 } |
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334 void ContiguousSpace::set_top_for_allocations() { |
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335 mangler()->set_top_for_allocations(top()); |
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336 } |
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337 void ContiguousSpace::check_mangled_unused_area(HeapWord* limit) { |
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338 mangler()->check_mangled_unused_area(limit); |
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339 } |
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340 |
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341 void ContiguousSpace::check_mangled_unused_area_complete() { |
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342 mangler()->check_mangled_unused_area_complete(); |
0 | 343 } |
344 | |
263
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345 // Mangled only the unused space that has not previously |
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346 // been mangled and that has not been allocated since being |
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347 // mangled. |
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348 void ContiguousSpace::mangle_unused_area() { |
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349 mangler()->mangle_unused_area(); |
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350 } |
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351 void ContiguousSpace::mangle_unused_area_complete() { |
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352 mangler()->mangle_unused_area_complete(); |
0 | 353 } |
263
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354 void ContiguousSpace::mangle_region(MemRegion mr) { |
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355 // Although this method uses SpaceMangler::mangle_region() which |
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356 // is not specific to a space, the when the ContiguousSpace version |
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357 // is called, it is always with regard to a space and this |
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358 // bounds checking is appropriate. |
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359 MemRegion space_mr(bottom(), end()); |
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360 assert(space_mr.contains(mr), "Mangling outside space"); |
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361 SpaceMangler::mangle_region(mr); |
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362 } |
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363 #endif // NOT_PRODUCT |
0 | 364 |
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365 void CompactibleSpace::initialize(MemRegion mr, |
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366 bool clear_space, |
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367 bool mangle_space) { |
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368 Space::initialize(mr, clear_space, mangle_space); |
356 | 369 set_compaction_top(bottom()); |
370 _next_compaction_space = NULL; | |
371 } | |
372 | |
373 void CompactibleSpace::clear(bool mangle_space) { | |
374 Space::clear(mangle_space); | |
0 | 375 _compaction_top = bottom(); |
376 } | |
377 | |
378 HeapWord* CompactibleSpace::forward(oop q, size_t size, | |
379 CompactPoint* cp, HeapWord* compact_top) { | |
380 // q is alive | |
381 // First check if we should switch compaction space | |
382 assert(this == cp->space, "'this' should be current compaction space."); | |
383 size_t compaction_max_size = pointer_delta(end(), compact_top); | |
384 while (size > compaction_max_size) { | |
385 // switch to next compaction space | |
386 cp->space->set_compaction_top(compact_top); | |
387 cp->space = cp->space->next_compaction_space(); | |
388 if (cp->space == NULL) { | |
389 cp->gen = GenCollectedHeap::heap()->prev_gen(cp->gen); | |
390 assert(cp->gen != NULL, "compaction must succeed"); | |
391 cp->space = cp->gen->first_compaction_space(); | |
392 assert(cp->space != NULL, "generation must have a first compaction space"); | |
393 } | |
394 compact_top = cp->space->bottom(); | |
395 cp->space->set_compaction_top(compact_top); | |
396 cp->threshold = cp->space->initialize_threshold(); | |
397 compaction_max_size = pointer_delta(cp->space->end(), compact_top); | |
398 } | |
399 | |
400 // store the forwarding pointer into the mark word | |
401 if ((HeapWord*)q != compact_top) { | |
402 q->forward_to(oop(compact_top)); | |
403 assert(q->is_gc_marked(), "encoding the pointer should preserve the mark"); | |
404 } else { | |
405 // if the object isn't moving we can just set the mark to the default | |
406 // mark and handle it specially later on. | |
407 q->init_mark(); | |
408 assert(q->forwardee() == NULL, "should be forwarded to NULL"); | |
409 } | |
410 | |
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411 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::register_live_oop(q, size)); |
0 | 412 compact_top += size; |
413 | |
414 // we need to update the offset table so that the beginnings of objects can be | |
415 // found during scavenge. Note that we are updating the offset table based on | |
416 // where the object will be once the compaction phase finishes. | |
417 if (compact_top > cp->threshold) | |
418 cp->threshold = | |
419 cp->space->cross_threshold(compact_top - size, compact_top); | |
420 return compact_top; | |
421 } | |
422 | |
423 | |
424 bool CompactibleSpace::insert_deadspace(size_t& allowed_deadspace_words, | |
425 HeapWord* q, size_t deadlength) { | |
426 if (allowed_deadspace_words >= deadlength) { | |
427 allowed_deadspace_words -= deadlength; | |
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428 CollectedHeap::fill_with_object(q, deadlength); |
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429 oop(q)->set_mark(oop(q)->mark()->set_marked()); |
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430 assert((int) deadlength == oop(q)->size(), "bad filler object size"); |
0 | 431 // Recall that we required "q == compaction_top". |
432 return true; | |
433 } else { | |
434 allowed_deadspace_words = 0; | |
435 return false; | |
436 } | |
437 } | |
438 | |
439 #define block_is_always_obj(q) true | |
440 #define obj_size(q) oop(q)->size() | |
441 #define adjust_obj_size(s) s | |
442 | |
443 void CompactibleSpace::prepare_for_compaction(CompactPoint* cp) { | |
444 SCAN_AND_FORWARD(cp, end, block_is_obj, block_size); | |
445 } | |
446 | |
447 // Faster object search. | |
448 void ContiguousSpace::prepare_for_compaction(CompactPoint* cp) { | |
449 SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size); | |
450 } | |
451 | |
452 void Space::adjust_pointers() { | |
453 // adjust all the interior pointers to point at the new locations of objects | |
454 // Used by MarkSweep::mark_sweep_phase3() | |
455 | |
456 // First check to see if there is any work to be done. | |
457 if (used() == 0) { | |
458 return; // Nothing to do. | |
459 } | |
460 | |
461 // Otherwise... | |
462 HeapWord* q = bottom(); | |
463 HeapWord* t = end(); | |
464 | |
465 debug_only(HeapWord* prev_q = NULL); | |
466 while (q < t) { | |
467 if (oop(q)->is_gc_marked()) { | |
468 // q is alive | |
469 | |
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470 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q))); |
0 | 471 // point all the oops to the new location |
472 size_t size = oop(q)->adjust_pointers(); | |
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473 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers()); |
0 | 474 |
475 debug_only(prev_q = q); | |
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476 VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size)); |
0 | 477 |
478 q += size; | |
479 } else { | |
480 // q is not a live object. But we're not in a compactible space, | |
481 // So we don't have live ranges. | |
482 debug_only(prev_q = q); | |
483 q += block_size(q); | |
484 assert(q > prev_q, "we should be moving forward through memory"); | |
485 } | |
486 } | |
487 assert(q == t, "just checking"); | |
488 } | |
489 | |
490 void CompactibleSpace::adjust_pointers() { | |
491 // Check first is there is any work to do. | |
492 if (used() == 0) { | |
493 return; // Nothing to do. | |
494 } | |
495 | |
496 SCAN_AND_ADJUST_POINTERS(adjust_obj_size); | |
497 } | |
498 | |
499 void CompactibleSpace::compact() { | |
500 SCAN_AND_COMPACT(obj_size); | |
501 } | |
502 | |
503 void Space::print_short() const { print_short_on(tty); } | |
504 | |
505 void Space::print_short_on(outputStream* st) const { | |
506 st->print(" space " SIZE_FORMAT "K, %3d%% used", capacity() / K, | |
507 (int) ((double) used() * 100 / capacity())); | |
508 } | |
509 | |
510 void Space::print() const { print_on(tty); } | |
511 | |
512 void Space::print_on(outputStream* st) const { | |
513 print_short_on(st); | |
514 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
515 bottom(), end()); | |
516 } | |
517 | |
518 void ContiguousSpace::print_on(outputStream* st) const { | |
519 print_short_on(st); | |
520 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
521 bottom(), top(), end()); | |
522 } | |
523 | |
524 void OffsetTableContigSpace::print_on(outputStream* st) const { | |
525 print_short_on(st); | |
526 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
527 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
528 bottom(), top(), _offsets.threshold(), end()); | |
529 } | |
530 | |
531 void ContiguousSpace::verify(bool allow_dirty) const { | |
532 HeapWord* p = bottom(); | |
533 HeapWord* t = top(); | |
534 HeapWord* prev_p = NULL; | |
535 while (p < t) { | |
536 oop(p)->verify(); | |
537 prev_p = p; | |
538 p += oop(p)->size(); | |
539 } | |
540 guarantee(p == top(), "end of last object must match end of space"); | |
541 if (top() != end()) { | |
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542 guarantee(top() == block_start_const(end()-1) && |
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543 top() == block_start_const(top()), |
0 | 544 "top should be start of unallocated block, if it exists"); |
545 } | |
546 } | |
547 | |
548 void Space::oop_iterate(OopClosure* blk) { | |
549 ObjectToOopClosure blk2(blk); | |
550 object_iterate(&blk2); | |
551 } | |
552 | |
553 HeapWord* Space::object_iterate_careful(ObjectClosureCareful* cl) { | |
554 guarantee(false, "NYI"); | |
555 return bottom(); | |
556 } | |
557 | |
558 HeapWord* Space::object_iterate_careful_m(MemRegion mr, | |
559 ObjectClosureCareful* cl) { | |
560 guarantee(false, "NYI"); | |
561 return bottom(); | |
562 } | |
563 | |
564 | |
565 void Space::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
566 assert(!mr.is_empty(), "Should be non-empty"); | |
567 // We use MemRegion(bottom(), end()) rather than used_region() below | |
568 // because the two are not necessarily equal for some kinds of | |
569 // spaces, in particular, certain kinds of free list spaces. | |
570 // We could use the more complicated but more precise: | |
571 // MemRegion(used_region().start(), round_to(used_region().end(), CardSize)) | |
572 // but the slight imprecision seems acceptable in the assertion check. | |
573 assert(MemRegion(bottom(), end()).contains(mr), | |
574 "Should be within used space"); | |
575 HeapWord* prev = cl->previous(); // max address from last time | |
576 if (prev >= mr.end()) { // nothing to do | |
577 return; | |
578 } | |
579 // This assert will not work when we go from cms space to perm | |
580 // space, and use same closure. Easy fix deferred for later. XXX YSR | |
581 // assert(prev == NULL || contains(prev), "Should be within space"); | |
582 | |
583 bool last_was_obj_array = false; | |
584 HeapWord *blk_start_addr, *region_start_addr; | |
585 if (prev > mr.start()) { | |
586 region_start_addr = prev; | |
587 blk_start_addr = prev; | |
518
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588 // The previous invocation may have pushed "prev" beyond the |
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589 // last allocated block yet there may be still be blocks |
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590 // in this region due to a particular coalescing policy. |
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591 // Relax the assertion so that the case where the unallocated |
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592 // block is maintained and "prev" is beyond the unallocated |
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593 // block does not cause the assertion to fire. |
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594 assert((BlockOffsetArrayUseUnallocatedBlock && |
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595 (!is_in(prev))) || |
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596 (blk_start_addr == block_start(region_start_addr)), "invariant"); |
0 | 597 } else { |
598 region_start_addr = mr.start(); | |
599 blk_start_addr = block_start(region_start_addr); | |
600 } | |
601 HeapWord* region_end_addr = mr.end(); | |
602 MemRegion derived_mr(region_start_addr, region_end_addr); | |
603 while (blk_start_addr < region_end_addr) { | |
604 const size_t size = block_size(blk_start_addr); | |
605 if (block_is_obj(blk_start_addr)) { | |
606 last_was_obj_array = cl->do_object_bm(oop(blk_start_addr), derived_mr); | |
607 } else { | |
608 last_was_obj_array = false; | |
609 } | |
610 blk_start_addr += size; | |
611 } | |
612 if (!last_was_obj_array) { | |
613 assert((bottom() <= blk_start_addr) && (blk_start_addr <= end()), | |
614 "Should be within (closed) used space"); | |
615 assert(blk_start_addr > prev, "Invariant"); | |
616 cl->set_previous(blk_start_addr); // min address for next time | |
617 } | |
618 } | |
619 | |
620 bool Space::obj_is_alive(const HeapWord* p) const { | |
621 assert (block_is_obj(p), "The address should point to an object"); | |
622 return true; | |
623 } | |
624 | |
625 void ContiguousSpace::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) { | |
626 assert(!mr.is_empty(), "Should be non-empty"); | |
627 assert(used_region().contains(mr), "Should be within used space"); | |
628 HeapWord* prev = cl->previous(); // max address from last time | |
629 if (prev >= mr.end()) { // nothing to do | |
630 return; | |
631 } | |
632 // See comment above (in more general method above) in case you | |
633 // happen to use this method. | |
634 assert(prev == NULL || is_in_reserved(prev), "Should be within space"); | |
635 | |
636 bool last_was_obj_array = false; | |
637 HeapWord *obj_start_addr, *region_start_addr; | |
638 if (prev > mr.start()) { | |
639 region_start_addr = prev; | |
640 obj_start_addr = prev; | |
641 assert(obj_start_addr == block_start(region_start_addr), "invariant"); | |
642 } else { | |
643 region_start_addr = mr.start(); | |
644 obj_start_addr = block_start(region_start_addr); | |
645 } | |
646 HeapWord* region_end_addr = mr.end(); | |
647 MemRegion derived_mr(region_start_addr, region_end_addr); | |
648 while (obj_start_addr < region_end_addr) { | |
649 oop obj = oop(obj_start_addr); | |
650 const size_t size = obj->size(); | |
651 last_was_obj_array = cl->do_object_bm(obj, derived_mr); | |
652 obj_start_addr += size; | |
653 } | |
654 if (!last_was_obj_array) { | |
655 assert((bottom() <= obj_start_addr) && (obj_start_addr <= end()), | |
656 "Should be within (closed) used space"); | |
657 assert(obj_start_addr > prev, "Invariant"); | |
658 cl->set_previous(obj_start_addr); // min address for next time | |
659 } | |
660 } | |
661 | |
662 #ifndef SERIALGC | |
663 #define ContigSpace_PAR_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
664 \ | |
665 void ContiguousSpace::par_oop_iterate(MemRegion mr, OopClosureType* blk) {\ | |
666 HeapWord* obj_addr = mr.start(); \ | |
667 HeapWord* t = mr.end(); \ | |
668 while (obj_addr < t) { \ | |
669 assert(oop(obj_addr)->is_oop(), "Should be an oop"); \ | |
670 obj_addr += oop(obj_addr)->oop_iterate(blk); \ | |
671 } \ | |
672 } | |
673 | |
674 ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DEFN) | |
675 | |
676 #undef ContigSpace_PAR_OOP_ITERATE_DEFN | |
677 #endif // SERIALGC | |
678 | |
679 void ContiguousSpace::oop_iterate(OopClosure* blk) { | |
680 if (is_empty()) return; | |
681 HeapWord* obj_addr = bottom(); | |
682 HeapWord* t = top(); | |
683 // Could call objects iterate, but this is easier. | |
684 while (obj_addr < t) { | |
685 obj_addr += oop(obj_addr)->oop_iterate(blk); | |
686 } | |
687 } | |
688 | |
689 void ContiguousSpace::oop_iterate(MemRegion mr, OopClosure* blk) { | |
690 if (is_empty()) { | |
691 return; | |
692 } | |
693 MemRegion cur = MemRegion(bottom(), top()); | |
694 mr = mr.intersection(cur); | |
695 if (mr.is_empty()) { | |
696 return; | |
697 } | |
698 if (mr.equals(cur)) { | |
699 oop_iterate(blk); | |
700 return; | |
701 } | |
702 assert(mr.end() <= top(), "just took an intersection above"); | |
703 HeapWord* obj_addr = block_start(mr.start()); | |
704 HeapWord* t = mr.end(); | |
705 | |
706 // Handle first object specially. | |
707 oop obj = oop(obj_addr); | |
708 SpaceMemRegionOopsIterClosure smr_blk(blk, mr); | |
709 obj_addr += obj->oop_iterate(&smr_blk); | |
710 while (obj_addr < t) { | |
711 oop obj = oop(obj_addr); | |
712 assert(obj->is_oop(), "expected an oop"); | |
713 obj_addr += obj->size(); | |
714 // If "obj_addr" is not greater than top, then the | |
715 // entire object "obj" is within the region. | |
716 if (obj_addr <= t) { | |
717 obj->oop_iterate(blk); | |
718 } else { | |
719 // "obj" extends beyond end of region | |
720 obj->oop_iterate(&smr_blk); | |
721 break; | |
722 } | |
723 }; | |
724 } | |
725 | |
726 void ContiguousSpace::object_iterate(ObjectClosure* blk) { | |
727 if (is_empty()) return; | |
728 WaterMark bm = bottom_mark(); | |
729 object_iterate_from(bm, blk); | |
730 } | |
731 | |
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732 // For a continguous space object_iterate() and safe_object_iterate() |
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733 // are the same. |
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734 void ContiguousSpace::safe_object_iterate(ObjectClosure* blk) { |
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735 object_iterate(blk); |
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736 } |
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737 |
0 | 738 void ContiguousSpace::object_iterate_from(WaterMark mark, ObjectClosure* blk) { |
739 assert(mark.space() == this, "Mark does not match space"); | |
740 HeapWord* p = mark.point(); | |
741 while (p < top()) { | |
742 blk->do_object(oop(p)); | |
743 p += oop(p)->size(); | |
744 } | |
745 } | |
746 | |
747 HeapWord* | |
748 ContiguousSpace::object_iterate_careful(ObjectClosureCareful* blk) { | |
749 HeapWord * limit = concurrent_iteration_safe_limit(); | |
750 assert(limit <= top(), "sanity check"); | |
751 for (HeapWord* p = bottom(); p < limit;) { | |
752 size_t size = blk->do_object_careful(oop(p)); | |
753 if (size == 0) { | |
754 return p; // failed at p | |
755 } else { | |
756 p += size; | |
757 } | |
758 } | |
759 return NULL; // all done | |
760 } | |
761 | |
762 #define ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
763 \ | |
764 void ContiguousSpace:: \ | |
765 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
766 HeapWord* t; \ | |
767 HeapWord* p = saved_mark_word(); \ | |
768 assert(p != NULL, "expected saved mark"); \ | |
769 \ | |
770 const intx interval = PrefetchScanIntervalInBytes; \ | |
771 do { \ | |
772 t = top(); \ | |
773 while (p < t) { \ | |
774 Prefetch::write(p, interval); \ | |
775 debug_only(HeapWord* prev = p); \ | |
776 oop m = oop(p); \ | |
777 p += m->oop_iterate(blk); \ | |
778 } \ | |
779 } while (t < top()); \ | |
780 \ | |
781 set_saved_mark_word(p); \ | |
782 } | |
783 | |
784 ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN) | |
785 | |
786 #undef ContigSpace_OOP_SINCE_SAVE_MARKS_DEFN | |
787 | |
788 // Very general, slow implementation. | |
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789 HeapWord* ContiguousSpace::block_start_const(const void* p) const { |
0 | 790 assert(MemRegion(bottom(), end()).contains(p), "p not in space"); |
791 if (p >= top()) { | |
792 return top(); | |
793 } else { | |
794 HeapWord* last = bottom(); | |
795 HeapWord* cur = last; | |
796 while (cur <= p) { | |
797 last = cur; | |
798 cur += oop(cur)->size(); | |
799 } | |
800 assert(oop(last)->is_oop(), "Should be an object start"); | |
801 return last; | |
802 } | |
803 } | |
804 | |
805 size_t ContiguousSpace::block_size(const HeapWord* p) const { | |
806 assert(MemRegion(bottom(), end()).contains(p), "p not in space"); | |
807 HeapWord* current_top = top(); | |
808 assert(p <= current_top, "p is not a block start"); | |
809 assert(p == current_top || oop(p)->is_oop(), "p is not a block start"); | |
810 if (p < current_top) | |
811 return oop(p)->size(); | |
812 else { | |
813 assert(p == current_top, "just checking"); | |
814 return pointer_delta(end(), (HeapWord*) p); | |
815 } | |
816 } | |
817 | |
818 // This version requires locking. | |
819 inline HeapWord* ContiguousSpace::allocate_impl(size_t size, | |
820 HeapWord* const end_value) { | |
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821 // In G1 there are places where a GC worker can allocates into a |
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822 // region using this serial allocation code without being prone to a |
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823 // race with other GC workers (we ensure that no other GC worker can |
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824 // access the same region at the same time). So the assert below is |
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825 // too strong in the case of G1. |
0 | 826 assert(Heap_lock->owned_by_self() || |
827 (SafepointSynchronize::is_at_safepoint() && | |
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828 (Thread::current()->is_VM_thread() || UseG1GC)), |
0 | 829 "not locked"); |
830 HeapWord* obj = top(); | |
831 if (pointer_delta(end_value, obj) >= size) { | |
832 HeapWord* new_top = obj + size; | |
833 set_top(new_top); | |
834 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
835 return obj; | |
836 } else { | |
837 return NULL; | |
838 } | |
839 } | |
840 | |
841 // This version is lock-free. | |
842 inline HeapWord* ContiguousSpace::par_allocate_impl(size_t size, | |
843 HeapWord* const end_value) { | |
844 do { | |
845 HeapWord* obj = top(); | |
846 if (pointer_delta(end_value, obj) >= size) { | |
847 HeapWord* new_top = obj + size; | |
848 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
849 // result can be one of two: | |
850 // the old top value: the exchange succeeded | |
851 // otherwise: the new value of the top is returned. | |
852 if (result == obj) { | |
853 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
854 return obj; | |
855 } | |
856 } else { | |
857 return NULL; | |
858 } | |
859 } while (true); | |
860 } | |
861 | |
862 // Requires locking. | |
863 HeapWord* ContiguousSpace::allocate(size_t size) { | |
864 return allocate_impl(size, end()); | |
865 } | |
866 | |
867 // Lock-free. | |
868 HeapWord* ContiguousSpace::par_allocate(size_t size) { | |
869 return par_allocate_impl(size, end()); | |
870 } | |
871 | |
872 void ContiguousSpace::allocate_temporary_filler(int factor) { | |
873 // allocate temporary type array decreasing free size with factor 'factor' | |
874 assert(factor >= 0, "just checking"); | |
875 size_t size = pointer_delta(end(), top()); | |
876 | |
877 // if space is full, return | |
878 if (size == 0) return; | |
879 | |
880 if (factor > 0) { | |
881 size -= size/factor; | |
882 } | |
883 size = align_object_size(size); | |
884 | |
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885 const size_t array_header_size = typeArrayOopDesc::header_size(T_INT); |
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886 if (size >= (size_t)align_object_size(array_header_size)) { |
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887 size_t length = (size - array_header_size) * (HeapWordSize / sizeof(jint)); |
0 | 888 // allocate uninitialized int array |
889 typeArrayOop t = (typeArrayOop) allocate(size); | |
890 assert(t != NULL, "allocation should succeed"); | |
891 t->set_mark(markOopDesc::prototype()); | |
892 t->set_klass(Universe::intArrayKlassObj()); | |
893 t->set_length((int)length); | |
894 } else { | |
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895 assert(size == CollectedHeap::min_fill_size(), |
0 | 896 "size for smallest fake object doesn't match"); |
897 instanceOop obj = (instanceOop) allocate(size); | |
898 obj->set_mark(markOopDesc::prototype()); | |
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899 obj->set_klass_gap(0); |
1142 | 900 obj->set_klass(SystemDictionary::Object_klass()); |
0 | 901 } |
902 } | |
903 | |
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904 void EdenSpace::clear(bool mangle_space) { |
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905 ContiguousSpace::clear(mangle_space); |
0 | 906 set_soft_end(end()); |
907 } | |
908 | |
909 // Requires locking. | |
910 HeapWord* EdenSpace::allocate(size_t size) { | |
911 return allocate_impl(size, soft_end()); | |
912 } | |
913 | |
914 // Lock-free. | |
915 HeapWord* EdenSpace::par_allocate(size_t size) { | |
916 return par_allocate_impl(size, soft_end()); | |
917 } | |
918 | |
919 HeapWord* ConcEdenSpace::par_allocate(size_t size) | |
920 { | |
921 do { | |
922 // The invariant is top() should be read before end() because | |
923 // top() can't be greater than end(), so if an update of _soft_end | |
924 // occurs between 'end_val = end();' and 'top_val = top();' top() | |
925 // also can grow up to the new end() and the condition | |
926 // 'top_val > end_val' is true. To ensure the loading order | |
927 // OrderAccess::loadload() is required after top() read. | |
928 HeapWord* obj = top(); | |
929 OrderAccess::loadload(); | |
930 if (pointer_delta(*soft_end_addr(), obj) >= size) { | |
931 HeapWord* new_top = obj + size; | |
932 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); | |
933 // result can be one of two: | |
934 // the old top value: the exchange succeeded | |
935 // otherwise: the new value of the top is returned. | |
936 if (result == obj) { | |
937 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); | |
938 return obj; | |
939 } | |
940 } else { | |
941 return NULL; | |
942 } | |
943 } while (true); | |
944 } | |
945 | |
946 | |
947 HeapWord* OffsetTableContigSpace::initialize_threshold() { | |
948 return _offsets.initialize_threshold(); | |
949 } | |
950 | |
951 HeapWord* OffsetTableContigSpace::cross_threshold(HeapWord* start, HeapWord* end) { | |
952 _offsets.alloc_block(start, end); | |
953 return _offsets.threshold(); | |
954 } | |
955 | |
956 OffsetTableContigSpace::OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray, | |
957 MemRegion mr) : | |
958 _offsets(sharedOffsetArray, mr), | |
959 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true) | |
960 { | |
961 _offsets.set_contig_space(this); | |
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962 initialize(mr, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
0 | 963 } |
964 | |
965 | |
966 class VerifyOldOopClosure : public OopClosure { | |
967 public: | |
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968 oop _the_obj; |
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969 bool _allow_dirty; |
0 | 970 void do_oop(oop* p) { |
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971 _the_obj->verify_old_oop(p, _allow_dirty); |
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972 } |
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973 void do_oop(narrowOop* p) { |
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974 _the_obj->verify_old_oop(p, _allow_dirty); |
0 | 975 } |
976 }; | |
977 | |
978 #define OBJ_SAMPLE_INTERVAL 0 | |
979 #define BLOCK_SAMPLE_INTERVAL 100 | |
980 | |
981 void OffsetTableContigSpace::verify(bool allow_dirty) const { | |
982 HeapWord* p = bottom(); | |
983 HeapWord* prev_p = NULL; | |
984 VerifyOldOopClosure blk; // Does this do anything? | |
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985 blk._allow_dirty = allow_dirty; |
0 | 986 int objs = 0; |
987 int blocks = 0; | |
988 | |
989 if (VerifyObjectStartArray) { | |
990 _offsets.verify(); | |
991 } | |
992 | |
993 while (p < top()) { | |
994 size_t size = oop(p)->size(); | |
995 // For a sampling of objects in the space, find it using the | |
996 // block offset table. | |
997 if (blocks == BLOCK_SAMPLE_INTERVAL) { | |
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998 guarantee(p == block_start_const(p + (size/2)), |
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999 "check offset computation"); |
0 | 1000 blocks = 0; |
1001 } else { | |
1002 blocks++; | |
1003 } | |
1004 | |
1005 if (objs == OBJ_SAMPLE_INTERVAL) { | |
1006 oop(p)->verify(); | |
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1007 blk._the_obj = oop(p); |
0 | 1008 oop(p)->oop_iterate(&blk); |
1009 objs = 0; | |
1010 } else { | |
1011 objs++; | |
1012 } | |
1013 prev_p = p; | |
1014 p += size; | |
1015 } | |
1016 guarantee(p == top(), "end of last object must match end of space"); | |
1017 } | |
1018 | |
1019 void OffsetTableContigSpace::serialize_block_offset_array_offsets( | |
1020 SerializeOopClosure* soc) { | |
1021 _offsets.serialize(soc); | |
1022 } | |
1023 | |
1024 | |
438 | 1025 size_t TenuredSpace::allowed_dead_ratio() const { |
0 | 1026 return MarkSweepDeadRatio; |
1027 } | |
1028 | |
1029 | |
438 | 1030 size_t ContigPermSpace::allowed_dead_ratio() const { |
0 | 1031 return PermMarkSweepDeadRatio; |
1032 } |